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Diffstat (limited to 'modules/proxy/proxy_util.c')
| -rw-r--r-- | modules/proxy/proxy_util.c | 5110 |
1 files changed, 5110 insertions, 0 deletions
diff --git a/modules/proxy/proxy_util.c b/modules/proxy/proxy_util.c new file mode 100644 index 0000000..caafde0 --- /dev/null +++ b/modules/proxy/proxy_util.c @@ -0,0 +1,5110 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* Utility routines for Apache proxy */ +#include "mod_proxy.h" +#include "ap_mpm.h" +#include "scoreboard.h" +#include "apr_version.h" +#include "apr_strings.h" +#include "apr_hash.h" +#include "proxy_util.h" +#include "ajp.h" +#include "scgi.h" + +#include "mod_http2.h" /* for http2_get_num_workers() */ + +#if APR_HAVE_UNISTD_H +#include <unistd.h> /* for getpid() */ +#endif + +#if APR_HAVE_SYS_UN_H +#include <sys/un.h> +#endif +#if (APR_MAJOR_VERSION < 2) +#include "apr_support.h" /* for apr_wait_for_io_or_timeout() */ +#endif + +APLOG_USE_MODULE(proxy); + +/* + * Opaque structure containing target server info when + * using a forward proxy. + * Up to now only used in combination with HTTP CONNECT. + */ +typedef struct { + int use_http_connect; /* Use SSL Tunneling via HTTP CONNECT */ + const char *target_host; /* Target hostname */ + apr_port_t target_port; /* Target port */ + const char *proxy_auth; /* Proxy authorization */ +} forward_info; + +/* Global balancer counter */ +int PROXY_DECLARE_DATA proxy_lb_workers = 0; +static int lb_workers_limit = 0; +const apr_strmatch_pattern PROXY_DECLARE_DATA *ap_proxy_strmatch_path; +const apr_strmatch_pattern PROXY_DECLARE_DATA *ap_proxy_strmatch_domain; + +extern apr_global_mutex_t *proxy_mutex; + +static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r); +static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r); +static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r); +static int proxy_match_word(struct dirconn_entry *This, request_rec *r); +static int ap_proxy_retry_worker(const char *proxy_function, proxy_worker *worker, server_rec *s); +static proxy_worker *proxy_balancer_get_best_worker(proxy_balancer *balancer, + request_rec *r, + proxy_is_best_callback_fn_t *is_best, + void *baton); + +APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(proxy, PROXY, int, create_req, + (request_rec *r, request_rec *pr), (r, pr), + OK, DECLINED) + +PROXY_DECLARE(apr_status_t) ap_proxy_strncpy(char *dst, const char *src, + apr_size_t dlen) +{ + char *thenil; + apr_size_t thelen; + + /* special case handling */ + if (!dlen) { + /* XXX: APR_ENOSPACE would be better */ + return APR_EGENERAL; + } + if (!src) { + *dst = '\0'; + return APR_SUCCESS; + } + thenil = apr_cpystrn(dst, src, dlen); + thelen = thenil - dst; + if (src[thelen] == '\0') { + return APR_SUCCESS; + } + return APR_EGENERAL; +} + +/* already called in the knowledge that the characters are hex digits */ +PROXY_DECLARE(int) ap_proxy_hex2c(const char *x) +{ + int i; + +#if !APR_CHARSET_EBCDIC + int ch = x[0]; + + if (apr_isdigit(ch)) { + i = ch - '0'; + } + else if (apr_isupper(ch)) { + i = ch - ('A' - 10); + } + else { + i = ch - ('a' - 10); + } + i <<= 4; + + ch = x[1]; + if (apr_isdigit(ch)) { + i += ch - '0'; + } + else if (apr_isupper(ch)) { + i += ch - ('A' - 10); + } + else { + i += ch - ('a' - 10); + } + return i; +#else /*APR_CHARSET_EBCDIC*/ + /* + * we assume that the hex value refers to an ASCII character + * so convert to EBCDIC so that it makes sense locally; + * + * example: + * + * client specifies %20 in URL to refer to a space char; + * at this point we're called with EBCDIC "20"; after turning + * EBCDIC "20" into binary 0x20, we then need to assume that 0x20 + * represents an ASCII char and convert 0x20 to EBCDIC, yielding + * 0x40 + */ + char buf[1]; + + if (1 == sscanf(x, "%2x", &i)) { + buf[0] = i & 0xFF; + ap_xlate_proto_from_ascii(buf, 1); + return buf[0]; + } + else { + return 0; + } +#endif /*APR_CHARSET_EBCDIC*/ +} + +PROXY_DECLARE(void) ap_proxy_c2hex(int ch, char *x) +{ +#if !APR_CHARSET_EBCDIC + int i; + + x[0] = '%'; + i = (ch & 0xF0) >> 4; + if (i >= 10) { + x[1] = ('A' - 10) + i; + } + else { + x[1] = '0' + i; + } + + i = ch & 0x0F; + if (i >= 10) { + x[2] = ('A' - 10) + i; + } + else { + x[2] = '0' + i; + } +#else /*APR_CHARSET_EBCDIC*/ + static const char ntoa[] = { "0123456789ABCDEF" }; + char buf[1]; + + ch &= 0xFF; + + buf[0] = ch; + ap_xlate_proto_to_ascii(buf, 1); + + x[0] = '%'; + x[1] = ntoa[(buf[0] >> 4) & 0x0F]; + x[2] = ntoa[buf[0] & 0x0F]; + x[3] = '\0'; +#endif /*APR_CHARSET_EBCDIC*/ +} + +/* + * canonicalise a URL-encoded string + */ + +/* + * Convert a URL-encoded string to canonical form. + * It decodes characters which need not be encoded, + * and encodes those which must be encoded, and does not touch + * those which must not be touched. + */ +PROXY_DECLARE(char *)ap_proxy_canonenc_ex(apr_pool_t *p, const char *x, int len, + enum enctype t, int flags, + int proxyreq) +{ + int i, j, ch; + char *y; + char *allowed; /* characters which should not be encoded */ + char *reserved; /* characters which much not be en/de-coded */ + int forcedec = flags & PROXY_CANONENC_FORCEDEC; + int noencslashesenc = flags & PROXY_CANONENC_NOENCODEDSLASHENCODING; + +/* + * N.B. in addition to :@&=, this allows ';' in an http path + * and '?' in an ftp path -- this may be revised + * + * Also, it makes a '+' character in a search string reserved, as + * it may be form-encoded. (Although RFC 1738 doesn't allow this - + * it only permits ; / ? : @ = & as reserved chars.) + */ + if (t == enc_path) { + allowed = "~$-_.+!*'(),;:@&="; + } + else if (t == enc_search) { + allowed = "$-_.!*'(),;:@&="; + } + else if (t == enc_user) { + allowed = "$-_.+!*'(),;@&="; + } + else if (t == enc_fpath) { + allowed = "$-_.+!*'(),?:@&="; + } + else { /* if (t == enc_parm) */ + allowed = "$-_.+!*'(),?/:@&="; + } + + if (t == enc_path) { + reserved = "/"; + } + else if (t == enc_search) { + reserved = "+"; + } + else { + reserved = ""; + } + + y = apr_palloc(p, 3 * len + 1); + + for (i = 0, j = 0; i < len; i++, j++) { +/* always handle '/' first */ + ch = x[i]; + if (strchr(reserved, ch)) { + y[j] = ch; + continue; + } +/* + * decode it if not already done. do not decode reverse proxied URLs + * unless specifically forced + */ + if ((forcedec || noencslashesenc + || (proxyreq && proxyreq != PROXYREQ_REVERSE)) && ch == '%') { + if (!apr_isxdigit(x[i + 1]) || !apr_isxdigit(x[i + 2])) { + return NULL; + } + ch = ap_proxy_hex2c(&x[i + 1]); + if (ch != 0 && strchr(reserved, ch)) { /* keep it encoded */ + y[j++] = x[i++]; + y[j++] = x[i++]; + y[j] = x[i]; + continue; + } + if (noencslashesenc && !forcedec && (proxyreq == PROXYREQ_REVERSE)) { + /* + * In the reverse proxy case when we only want to keep encoded + * slashes untouched revert back to '%' which will cause + * '%' to be encoded in the following. + */ + ch = '%'; + } + else { + i += 2; + } + } +/* recode it, if necessary */ + if (!apr_isalnum(ch) && !strchr(allowed, ch)) { + ap_proxy_c2hex(ch, &y[j]); + j += 2; + } + else { + y[j] = ch; + } + } + y[j] = '\0'; + return y; +} + +/* + * Convert a URL-encoded string to canonical form. + * It decodes characters which need not be encoded, + * and encodes those which must be encoded, and does not touch + * those which must not be touched. + */ +PROXY_DECLARE(char *)ap_proxy_canonenc(apr_pool_t *p, const char *x, int len, + enum enctype t, int forcedec, + int proxyreq) +{ + int flags; + + flags = forcedec ? PROXY_CANONENC_FORCEDEC : 0; + return ap_proxy_canonenc_ex(p, x, len, t, flags, proxyreq); +} + +/* + * Parses network-location. + * urlp on input the URL; on output the path, after the leading / + * user NULL if no user/password permitted + * password holder for password + * host holder for host + * port port number; only set if one is supplied. + * + * Returns an error string. + */ +PROXY_DECLARE(char *) + ap_proxy_canon_netloc(apr_pool_t *p, char **const urlp, char **userp, + char **passwordp, char **hostp, apr_port_t *port) +{ + char *addr, *scope_id, *strp, *host, *url = *urlp; + char *user = NULL, *password = NULL; + apr_port_t tmp_port; + apr_status_t rv; + + if (url[0] != '/' || url[1] != '/') { + return "Malformed URL"; + } + host = url + 2; + url = strchr(host, '/'); + if (url == NULL) { + url = ""; + } + else { + *(url++) = '\0'; /* skip separating '/' */ + } + + /* find _last_ '@' since it might occur in user/password part */ + strp = strrchr(host, '@'); + + if (strp != NULL) { + *strp = '\0'; + user = host; + host = strp + 1; + +/* find password */ + strp = strchr(user, ':'); + if (strp != NULL) { + *strp = '\0'; + password = ap_proxy_canonenc(p, strp + 1, strlen(strp + 1), enc_user, 1, 0); + if (password == NULL) { + return "Bad %-escape in URL (password)"; + } + } + + user = ap_proxy_canonenc(p, user, strlen(user), enc_user, 1, 0); + if (user == NULL) { + return "Bad %-escape in URL (username)"; + } + } + if (userp != NULL) { + *userp = user; + } + if (passwordp != NULL) { + *passwordp = password; + } + + /* + * Parse the host string to separate host portion from optional port. + * Perform range checking on port. + */ + rv = apr_parse_addr_port(&addr, &scope_id, &tmp_port, host, p); + if (rv != APR_SUCCESS || addr == NULL || scope_id != NULL) { + return "Invalid host/port"; + } + if (tmp_port != 0) { /* only update caller's port if port was specified */ + *port = tmp_port; + } + + ap_str_tolower(addr); /* DNS names are case-insensitive */ + + *urlp = url; + *hostp = addr; + + return NULL; +} + +PROXY_DECLARE(int) ap_proxyerror(request_rec *r, int statuscode, const char *message) +{ + apr_table_setn(r->notes, "error-notes", + apr_pstrcat(r->pool, + "The proxy server could not handle the request<p>" + "Reason: <strong>", ap_escape_html(r->pool, message), + "</strong></p>", + NULL)); + + /* Allow "error-notes" string to be printed by ap_send_error_response() */ + apr_table_setn(r->notes, "verbose-error-to", "*"); + + r->status_line = apr_psprintf(r->pool, "%3.3u Proxy Error", statuscode); + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00898) "%s returned by %s", message, + r->uri); + return statuscode; +} + +static const char * + proxy_get_host_of_request(request_rec *r) +{ + char *url, *user = NULL, *password = NULL, *err, *host = NULL; + apr_port_t port; + + if (r->hostname != NULL) { + return r->hostname; + } + + /* Set url to the first char after "scheme://" */ + if ((url = strchr(r->uri, ':')) == NULL || url[1] != '/' || url[2] != '/') { + return NULL; + } + + url = apr_pstrdup(r->pool, &url[1]); /* make it point to "//", which is what proxy_canon_netloc expects */ + + err = ap_proxy_canon_netloc(r->pool, &url, &user, &password, &host, &port); + + if (err != NULL) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00899) "%s", err); + } + + r->hostname = host; + + return host; /* ought to return the port, too */ +} + +/* Return TRUE if addr represents an IP address (or an IP network address) */ +PROXY_DECLARE(int) ap_proxy_is_ipaddr(struct dirconn_entry *This, apr_pool_t *p) +{ + const char *addr = This->name; + long ip_addr[4]; + int i, quads; + long bits; + + /* + * if the address is given with an explicit netmask, use that + * Due to a deficiency in apr_inet_addr(), it is impossible to parse + * "partial" addresses (with less than 4 quads) correctly, i.e. + * 192.168.123 is parsed as 192.168.0.123, which is not what I want. + * I therefore have to parse the IP address manually: + * if (proxy_readmask(This->name, &This->addr.s_addr, &This->mask.s_addr) == 0) + * addr and mask were set by proxy_readmask() + * return 1; + */ + + /* + * Parse IP addr manually, optionally allowing + * abbreviated net addresses like 192.168. + */ + + /* Iterate over up to 4 (dotted) quads. */ + for (quads = 0; quads < 4 && *addr != '\0'; ++quads) { + char *tmp; + + if (*addr == '/' && quads > 0) { /* netmask starts here. */ + break; + } + + if (!apr_isdigit(*addr)) { + return 0; /* no digit at start of quad */ + } + + ip_addr[quads] = strtol(addr, &tmp, 0); + + if (tmp == addr) { /* expected a digit, found something else */ + return 0; + } + + if (ip_addr[quads] < 0 || ip_addr[quads] > 255) { + /* invalid octet */ + return 0; + } + + addr = tmp; + + if (*addr == '.' && quads != 3) { + ++addr; /* after the 4th quad, a dot would be illegal */ + } + } + + for (This->addr.s_addr = 0, i = 0; i < quads; ++i) { + This->addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i)); + } + + if (addr[0] == '/' && apr_isdigit(addr[1])) { /* net mask follows: */ + char *tmp; + + ++addr; + + bits = strtol(addr, &tmp, 0); + + if (tmp == addr) { /* expected a digit, found something else */ + return 0; + } + + addr = tmp; + + if (bits < 0 || bits > 32) { /* netmask must be between 0 and 32 */ + return 0; + } + + } + else { + /* + * Determine (i.e., "guess") netmask by counting the + * number of trailing .0's; reduce #quads appropriately + * (so that 192.168.0.0 is equivalent to 192.168.) + */ + while (quads > 0 && ip_addr[quads - 1] == 0) { + --quads; + } + + /* "IP Address should be given in dotted-quad form, optionally followed by a netmask (e.g., 192.168.111.0/24)"; */ + if (quads < 1) { + return 0; + } + + /* every zero-byte counts as 8 zero-bits */ + bits = 8 * quads; + + if (bits != 32) { /* no warning for fully qualified IP address */ + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00900) + "Warning: NetMask not supplied with IP-Addr; guessing: %s/%ld", + inet_ntoa(This->addr), bits); + } + } + + This->mask.s_addr = htonl(APR_INADDR_NONE << (32 - bits)); + + if (*addr == '\0' && (This->addr.s_addr & ~This->mask.s_addr) != 0) { + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00901) + "Warning: NetMask and IP-Addr disagree in %s/%ld", + inet_ntoa(This->addr), bits); + This->addr.s_addr &= This->mask.s_addr; + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00902) + " Set to %s/%ld", inet_ntoa(This->addr), bits); + } + + if (*addr == '\0') { + This->matcher = proxy_match_ipaddr; + return 1; + } + else { + return (*addr == '\0'); /* okay iff we've parsed the whole string */ + } +} + +/* Return TRUE if addr represents an IP address (or an IP network address) */ +static int proxy_match_ipaddr(struct dirconn_entry *This, request_rec *r) +{ + int i, ip_addr[4]; + struct in_addr addr, *ip; + const char *host = proxy_get_host_of_request(r); + + if (host == NULL) { /* oops! */ + return 0; + } + + memset(&addr, '\0', sizeof addr); + memset(ip_addr, '\0', sizeof ip_addr); + + if (4 == sscanf(host, "%d.%d.%d.%d", &ip_addr[0], &ip_addr[1], &ip_addr[2], &ip_addr[3])) { + for (addr.s_addr = 0, i = 0; i < 4; ++i) { + /* ap_proxy_is_ipaddr() already confirmed that we have + * a valid octet in ip_addr[i] + */ + addr.s_addr |= htonl(ip_addr[i] << (24 - 8 * i)); + } + + if (This->addr.s_addr == (addr.s_addr & This->mask.s_addr)) { +#if DEBUGGING + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00903) + "1)IP-Match: %s[%s] <-> ", host, inet_ntoa(addr)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00904) + "%s/", inet_ntoa(This->addr)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00905) + "%s", inet_ntoa(This->mask)); +#endif + return 1; + } +#if DEBUGGING + else { + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00906) + "1)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(addr)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00907) + "%s/", inet_ntoa(This->addr)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00908) + "%s", inet_ntoa(This->mask)); + } +#endif + } + else { + struct apr_sockaddr_t *reqaddr; + + if (apr_sockaddr_info_get(&reqaddr, host, APR_UNSPEC, 0, 0, r->pool) + != APR_SUCCESS) { +#if DEBUGGING + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00909) + "2)IP-NoMatch: hostname=%s msg=Host not found", host); +#endif + return 0; + } + + /* Try to deal with multiple IP addr's for a host */ + /* FIXME: This needs to be able to deal with IPv6 */ + while (reqaddr) { + ip = (struct in_addr *) reqaddr->ipaddr_ptr; + if (This->addr.s_addr == (ip->s_addr & This->mask.s_addr)) { +#if DEBUGGING + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00910) + "3)IP-Match: %s[%s] <-> ", host, inet_ntoa(*ip)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00911) + "%s/", inet_ntoa(This->addr)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00912) + "%s", inet_ntoa(This->mask)); +#endif + return 1; + } +#if DEBUGGING + else { + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00913) + "3)IP-NoMatch: %s[%s] <-> ", host, inet_ntoa(*ip)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00914) + "%s/", inet_ntoa(This->addr)); + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(00915) + "%s", inet_ntoa(This->mask)); + } +#endif + reqaddr = reqaddr->next; + } + } + + return 0; +} + +/* Return TRUE if addr represents a domain name */ +PROXY_DECLARE(int) ap_proxy_is_domainname(struct dirconn_entry *This, apr_pool_t *p) +{ + char *addr = This->name; + int i; + + /* Domain name must start with a '.' */ + if (addr[0] != '.') { + return 0; + } + + /* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */ + for (i = 0; apr_isalnum(addr[i]) || addr[i] == '-' || addr[i] == '.'; ++i) { + continue; + } + +#if 0 + if (addr[i] == ':') { + ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, APLOGNO(03234) + "@@@@ handle optional port in proxy_is_domainname()"); + /* @@@@ handle optional port */ + } +#endif + + if (addr[i] != '\0') { + return 0; + } + + /* Strip trailing dots */ + for (i = strlen(addr) - 1; i > 0 && addr[i] == '.'; --i) { + addr[i] = '\0'; + } + + This->matcher = proxy_match_domainname; + return 1; +} + +/* Return TRUE if host "host" is in domain "domain" */ +static int proxy_match_domainname(struct dirconn_entry *This, request_rec *r) +{ + const char *host = proxy_get_host_of_request(r); + int d_len = strlen(This->name), h_len; + + if (host == NULL) { /* some error was logged already */ + return 0; + } + + h_len = strlen(host); + + /* @@@ do this within the setup? */ + /* Ignore trailing dots in domain comparison: */ + while (d_len > 0 && This->name[d_len - 1] == '.') { + --d_len; + } + while (h_len > 0 && host[h_len - 1] == '.') { + --h_len; + } + return h_len > d_len + && strncasecmp(&host[h_len - d_len], This->name, d_len) == 0; +} + +/* Return TRUE if host represents a host name */ +PROXY_DECLARE(int) ap_proxy_is_hostname(struct dirconn_entry *This, apr_pool_t *p) +{ + struct apr_sockaddr_t *addr; + char *host = This->name; + int i; + + /* Host names must not start with a '.' */ + if (host[0] == '.') { + return 0; + } + /* rfc1035 says DNS names must consist of "[-a-zA-Z0-9]" and '.' */ + for (i = 0; apr_isalnum(host[i]) || host[i] == '-' || host[i] == '.'; ++i); + + if (host[i] != '\0' || apr_sockaddr_info_get(&addr, host, APR_UNSPEC, 0, 0, p) != APR_SUCCESS) { + return 0; + } + + This->hostaddr = addr; + + /* Strip trailing dots */ + for (i = strlen(host) - 1; i > 0 && host[i] == '.'; --i) { + host[i] = '\0'; + } + + This->matcher = proxy_match_hostname; + return 1; +} + +/* Return TRUE if host "host" is equal to host2 "host2" */ +static int proxy_match_hostname(struct dirconn_entry *This, request_rec *r) +{ + char *host = This->name; + const char *host2 = proxy_get_host_of_request(r); + int h2_len; + int h1_len; + + if (host == NULL || host2 == NULL) { + return 0; /* oops! */ + } + + h2_len = strlen(host2); + h1_len = strlen(host); + +#if 0 + struct apr_sockaddr_t *addr = *This->hostaddr; + + /* Try to deal with multiple IP addr's for a host */ + while (addr) { + if (addr->ipaddr_ptr == ? ? ? ? ? ? ? ? ? ? ? ? ?) + return 1; + addr = addr->next; + } +#endif + + /* Ignore trailing dots in host2 comparison: */ + while (h2_len > 0 && host2[h2_len - 1] == '.') { + --h2_len; + } + while (h1_len > 0 && host[h1_len - 1] == '.') { + --h1_len; + } + return h1_len == h2_len + && strncasecmp(host, host2, h1_len) == 0; +} + +/* Return TRUE if addr is to be matched as a word */ +PROXY_DECLARE(int) ap_proxy_is_word(struct dirconn_entry *This, apr_pool_t *p) +{ + This->matcher = proxy_match_word; + return 1; +} + +/* Return TRUE if string "str2" occurs literally in "str1" */ +static int proxy_match_word(struct dirconn_entry *This, request_rec *r) +{ + const char *host = proxy_get_host_of_request(r); + return host != NULL && ap_strstr_c(host, This->name) != NULL; +} + +/* Backwards-compatible interface. */ +PROXY_DECLARE(int) ap_proxy_checkproxyblock(request_rec *r, proxy_server_conf *conf, + apr_sockaddr_t *uri_addr) +{ + return ap_proxy_checkproxyblock2(r, conf, uri_addr->hostname, uri_addr); +} + +#define MAX_IP_STR_LEN (46) + +PROXY_DECLARE(int) ap_proxy_checkproxyblock2(request_rec *r, proxy_server_conf *conf, + const char *hostname, apr_sockaddr_t *addr) +{ + int j; + + /* XXX FIXME: conf->noproxies->elts is part of an opaque structure */ + for (j = 0; j < conf->noproxies->nelts; j++) { + struct noproxy_entry *npent = (struct noproxy_entry *) conf->noproxies->elts; + struct apr_sockaddr_t *conf_addr; + + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "checking remote machine [%s] against [%s]", + hostname, npent[j].name); + if (ap_strstr_c(hostname, npent[j].name) || npent[j].name[0] == '*') { + ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00916) + "connect to remote machine %s blocked: name %s " + "matched", hostname, npent[j].name); + return HTTP_FORBIDDEN; + } + + /* No IP address checks if no IP address was passed in, + * i.e. the forward address proxy case, where this server does + * not resolve the hostname. */ + if (!addr) + continue; + + for (conf_addr = npent[j].addr; conf_addr; conf_addr = conf_addr->next) { + char caddr[MAX_IP_STR_LEN], uaddr[MAX_IP_STR_LEN]; + apr_sockaddr_t *uri_addr; + + if (apr_sockaddr_ip_getbuf(caddr, sizeof caddr, conf_addr)) + continue; + + for (uri_addr = addr; uri_addr; uri_addr = uri_addr->next) { + if (apr_sockaddr_ip_getbuf(uaddr, sizeof uaddr, uri_addr)) + continue; + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "ProxyBlock comparing %s and %s", caddr, uaddr); + if (!strcmp(caddr, uaddr)) { + ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(00917) + "connect to remote machine %s blocked: " + "IP %s matched", hostname, caddr); + return HTTP_FORBIDDEN; + } + } + } + } + + return OK; +} + +/* set up the minimal filter set */ +PROXY_DECLARE(int) ap_proxy_pre_http_request(conn_rec *c, request_rec *r) +{ + ap_add_input_filter("HTTP_IN", NULL, r, c); + return OK; +} + +PROXY_DECLARE(const char *) ap_proxy_location_reverse_map(request_rec *r, + proxy_dir_conf *conf, const char *url) +{ + proxy_req_conf *rconf; + struct proxy_alias *ent; + int i, l1, l1_orig, l2; + char *u; + + /* + * XXX FIXME: Make sure this handled the ambiguous case of the :<PORT> + * after the hostname + * XXX FIXME: Ensure the /uri component is a case sensitive match + */ + if (r->proxyreq != PROXYREQ_REVERSE) { + return url; + } + + l1_orig = strlen(url); + if (conf->interpolate_env == 1) { + rconf = ap_get_module_config(r->request_config, &proxy_module); + ent = (struct proxy_alias *)rconf->raliases->elts; + } + else { + ent = (struct proxy_alias *)conf->raliases->elts; + } + for (i = 0; i < conf->raliases->nelts; i++) { + proxy_server_conf *sconf = (proxy_server_conf *) + ap_get_module_config(r->server->module_config, &proxy_module); + proxy_balancer *balancer; + const char *real = ent[i].real; + + /* Restore the url length, if it had been changed by the code below */ + l1 = l1_orig; + + /* + * First check if mapping against a balancer and see + * if we have such a entity. If so, then we need to + * find the particulars of the actual worker which may + * or may not be the right one... basically, we need + * to find which member actually handled this request. + */ + if (ap_proxy_valid_balancer_name((char *)real, 0) && + (balancer = ap_proxy_get_balancer(r->pool, sconf, real, 1))) { + int n, l3 = 0; + proxy_worker **worker = (proxy_worker **)balancer->workers->elts; + const char *urlpart = ap_strchr_c(real + sizeof(BALANCER_PREFIX) - 1, '/'); + if (urlpart) { + if (!urlpart[1]) + urlpart = NULL; + else + l3 = strlen(urlpart); + } + /* The balancer comparison is a bit trickier. Given the context + * BalancerMember balancer://alias http://example.com/foo + * ProxyPassReverse /bash balancer://alias/bar + * translate url http://example.com/foo/bar/that to /bash/that + */ + for (n = 0; n < balancer->workers->nelts; n++) { + l2 = strlen((*worker)->s->name_ex); + if (urlpart) { + /* urlpart (l3) assuredly starts with its own '/' */ + if ((*worker)->s->name_ex[l2 - 1] == '/') + --l2; + if (l1 >= l2 + l3 + && strncasecmp((*worker)->s->name_ex, url, l2) == 0 + && strncmp(urlpart, url + l2, l3) == 0) { + u = apr_pstrcat(r->pool, ent[i].fake, &url[l2 + l3], + NULL); + return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r); + } + } + else if (l1 >= l2 && strncasecmp((*worker)->s->name_ex, url, l2) == 0) { + /* edge case where fake is just "/"... avoid double slash */ + if ((ent[i].fake[0] == '/') && (ent[i].fake[1] == 0) && (url[l2] == '/')) { + u = apr_pstrdup(r->pool, &url[l2]); + } else { + u = apr_pstrcat(r->pool, ent[i].fake, &url[l2], NULL); + } + return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r); + } + worker++; + } + } + else { + const char *part = url; + l2 = strlen(real); + if (real[0] == '/') { + part = ap_strstr_c(url, "://"); + if (part) { + part = ap_strchr_c(part+3, '/'); + if (part) { + l1 = strlen(part); + } + else { + part = url; + } + } + else { + part = url; + } + } + if (l2 > 0 && l1 >= l2 && strncasecmp(real, part, l2) == 0) { + u = apr_pstrcat(r->pool, ent[i].fake, &part[l2], NULL); + return ap_is_url(u) ? u : ap_construct_url(r->pool, u, r); + } + } + } + + return url; +} + +/* + * Cookies are a bit trickier to match: we've got two substrings to worry + * about, and we can't just find them with strstr 'cos of case. Regexp + * matching would be an easy fix, but for better consistency with all the + * other matches we'll refrain and use apr_strmatch to find path=/domain= + * and stick to plain strings for the config values. + */ +PROXY_DECLARE(const char *) ap_proxy_cookie_reverse_map(request_rec *r, + proxy_dir_conf *conf, const char *str) +{ + proxy_req_conf *rconf = ap_get_module_config(r->request_config, + &proxy_module); + struct proxy_alias *ent; + apr_size_t len = strlen(str); + const char *newpath = NULL; + const char *newdomain = NULL; + const char *pathp; + const char *domainp; + const char *pathe = NULL; + const char *domaine = NULL; + apr_size_t l1, l2, poffs = 0, doffs = 0; + int i; + int ddiff = 0; + int pdiff = 0; + char *tmpstr, *tmpstr_orig, *token, *last, *ret; + + if (r->proxyreq != PROXYREQ_REVERSE) { + return str; + } + + /* + * Find the match and replacement, but save replacing until we've done + * both path and domain so we know the new strlen + */ + tmpstr_orig = tmpstr = apr_pstrdup(r->pool, str); + while ((token = apr_strtok(tmpstr, ";", &last))) { + /* skip leading spaces */ + while (apr_isspace(*token)) { + ++token; + } + + if (ap_cstr_casecmpn("path=", token, 5) == 0) { + pathp = token + 5; + poffs = pathp - tmpstr_orig; + l1 = strlen(pathp); + pathe = str + poffs + l1; + if (conf->interpolate_env == 1) { + ent = (struct proxy_alias *)rconf->cookie_paths->elts; + } + else { + ent = (struct proxy_alias *)conf->cookie_paths->elts; + } + for (i = 0; i < conf->cookie_paths->nelts; i++) { + l2 = strlen(ent[i].fake); + if (l1 >= l2 && strncmp(ent[i].fake, pathp, l2) == 0) { + newpath = ent[i].real; + pdiff = strlen(newpath) - l1; + break; + } + } + } + else if (ap_cstr_casecmpn("domain=", token, 7) == 0) { + domainp = token + 7; + doffs = domainp - tmpstr_orig; + l1 = strlen(domainp); + domaine = str + doffs + l1; + if (conf->interpolate_env == 1) { + ent = (struct proxy_alias *)rconf->cookie_domains->elts; + } + else { + ent = (struct proxy_alias *)conf->cookie_domains->elts; + } + for (i = 0; i < conf->cookie_domains->nelts; i++) { + l2 = strlen(ent[i].fake); + if (l1 >= l2 && strncasecmp(ent[i].fake, domainp, l2) == 0) { + newdomain = ent[i].real; + ddiff = strlen(newdomain) - l1; + break; + } + } + } + + /* Iterate the remaining tokens using apr_strtok(NULL, ...) */ + tmpstr = NULL; + } + + if (newpath) { + ret = apr_palloc(r->pool, len + pdiff + ddiff + 1); + l1 = strlen(newpath); + if (newdomain) { + l2 = strlen(newdomain); + if (doffs > poffs) { + memcpy(ret, str, poffs); + memcpy(ret + poffs, newpath, l1); + memcpy(ret + poffs + l1, pathe, str + doffs - pathe); + memcpy(ret + doffs + pdiff, newdomain, l2); + strcpy(ret + doffs + pdiff + l2, domaine); + } + else { + memcpy(ret, str, doffs) ; + memcpy(ret + doffs, newdomain, l2); + memcpy(ret + doffs + l2, domaine, str + poffs - domaine); + memcpy(ret + poffs + ddiff, newpath, l1); + strcpy(ret + poffs + ddiff + l1, pathe); + } + } + else { + memcpy(ret, str, poffs); + memcpy(ret + poffs, newpath, l1); + strcpy(ret + poffs + l1, pathe); + } + } + else if (newdomain) { + ret = apr_palloc(r->pool, len + ddiff + 1); + l2 = strlen(newdomain); + memcpy(ret, str, doffs); + memcpy(ret + doffs, newdomain, l2); + strcpy(ret + doffs + l2, domaine); + } + else { + ret = (char *)str; /* no change */ + } + + return ret; +} + +/* + * BALANCER related... + */ + +/* + * verifies that the balancer name conforms to standards. + */ +PROXY_DECLARE(int) ap_proxy_valid_balancer_name(char *name, int i) +{ + if (!i) + i = sizeof(BALANCER_PREFIX)-1; + return (!ap_cstr_casecmpn(name, BALANCER_PREFIX, i)); +} + + +PROXY_DECLARE(proxy_balancer *) ap_proxy_get_balancer(apr_pool_t *p, + proxy_server_conf *conf, + const char *url, + int care) +{ + proxy_balancer *balancer; + char *c, *uri = apr_pstrdup(p, url); + int i; + proxy_hashes hash; + + c = strchr(uri, ':'); + if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0') { + return NULL; + } + /* remove path from uri */ + if ((c = strchr(c + 3, '/'))) { + *c = '\0'; + } + ap_str_tolower(uri); + hash.def = ap_proxy_hashfunc(uri, PROXY_HASHFUNC_DEFAULT); + hash.fnv = ap_proxy_hashfunc(uri, PROXY_HASHFUNC_FNV); + balancer = (proxy_balancer *)conf->balancers->elts; + for (i = 0; i < conf->balancers->nelts; i++) { + if (balancer->hash.def == hash.def && balancer->hash.fnv == hash.fnv) { + if (!care || !balancer->s->inactive) { + return balancer; + } + } + balancer++; + } + return NULL; +} + + +PROXY_DECLARE(char *) ap_proxy_update_balancer(apr_pool_t *p, + proxy_balancer *balancer, + const char *url) +{ + apr_uri_t puri; + if (!url) { + return NULL; + } + if (apr_uri_parse(p, url, &puri) != APR_SUCCESS) { + return apr_psprintf(p, "unable to parse: %s", url); + } + if (puri.path && PROXY_STRNCPY(balancer->s->vpath, puri.path) != APR_SUCCESS) { + return apr_psprintf(p, "balancer %s front-end virtual-path (%s) too long", + balancer->s->name, puri.path); + } + if (puri.hostname && PROXY_STRNCPY(balancer->s->vhost, puri.hostname) != APR_SUCCESS) { + return apr_psprintf(p, "balancer %s front-end vhost name (%s) too long", + balancer->s->name, puri.hostname); + } + return NULL; +} + +#define PROXY_UNSET_NONCE '\n' + +PROXY_DECLARE(char *) ap_proxy_define_balancer(apr_pool_t *p, + proxy_balancer **balancer, + proxy_server_conf *conf, + const char *url, + const char *alias, + int do_malloc) +{ + proxy_balancer_method *lbmethod; + proxy_balancer_shared *bshared; + char *c, *q, *uri = apr_pstrdup(p, url); + const char *sname; + + /* We should never get here without a valid BALANCER_PREFIX... */ + + c = strchr(uri, ':'); + if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0') + return apr_psprintf(p, "Bad syntax for a balancer name (%s)", uri); + /* remove path from uri */ + if ((q = strchr(c + 3, '/'))) + *q = '\0'; + + ap_str_tolower(uri); + *balancer = apr_array_push(conf->balancers); + memset(*balancer, 0, sizeof(proxy_balancer)); + + /* + * NOTE: The default method is byrequests - if it doesn't + * exist, that's OK at this time. We check when we share and sync + */ + lbmethod = ap_lookup_provider(PROXY_LBMETHOD, "byrequests", "0"); + (*balancer)->lbmethod = lbmethod; + + (*balancer)->workers = apr_array_make(p, 5, sizeof(proxy_worker *)); +#if APR_HAS_THREADS + (*balancer)->gmutex = NULL; + (*balancer)->tmutex = NULL; +#endif + + if (do_malloc) + bshared = ap_malloc(sizeof(proxy_balancer_shared)); + else + bshared = apr_palloc(p, sizeof(proxy_balancer_shared)); + + memset(bshared, 0, sizeof(proxy_balancer_shared)); + + bshared->was_malloced = (do_malloc != 0); + PROXY_STRNCPY(bshared->lbpname, "byrequests"); + if (PROXY_STRNCPY(bshared->name, uri) != APR_SUCCESS) { + if (do_malloc) free(bshared); + return apr_psprintf(p, "balancer name (%s) too long", uri); + } + (*balancer)->lbmethod_set = 1; + + /* + * We do the below for verification. The real sname will be + * done post_config + */ + ap_pstr2_alnum(p, bshared->name + sizeof(BALANCER_PREFIX) - 1, + &sname); + sname = apr_pstrcat(p, conf->id, "_", sname, NULL); + if (PROXY_STRNCPY(bshared->sname, sname) != APR_SUCCESS) { + if (do_malloc) free(bshared); + return apr_psprintf(p, "balancer safe-name (%s) too long", sname); + } + bshared->hash.def = ap_proxy_hashfunc(bshared->name, PROXY_HASHFUNC_DEFAULT); + bshared->hash.fnv = ap_proxy_hashfunc(bshared->name, PROXY_HASHFUNC_FNV); + (*balancer)->hash = bshared->hash; + + bshared->forcerecovery = 1; + bshared->sticky_separator = '.'; + *bshared->nonce = PROXY_UNSET_NONCE; /* impossible valid input */ + + (*balancer)->s = bshared; + (*balancer)->sconf = conf; + + return ap_proxy_update_balancer(p, *balancer, alias); +} + +/* + * Create an already defined balancer and free up memory. + */ +PROXY_DECLARE(apr_status_t) ap_proxy_share_balancer(proxy_balancer *balancer, + proxy_balancer_shared *shm, + int i) +{ + apr_status_t rv = APR_SUCCESS; + proxy_balancer_method *lbmethod; + char *action = "copying"; + if (!shm || !balancer->s) + return APR_EINVAL; + + if ((balancer->s->hash.def != shm->hash.def) || + (balancer->s->hash.fnv != shm->hash.fnv)) { + memcpy(shm, balancer->s, sizeof(proxy_balancer_shared)); + if (balancer->s->was_malloced) + free(balancer->s); + } else { + action = "re-using"; + } + balancer->s = shm; + balancer->s->index = i; + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02337) + "%s shm[%d] (0x%pp) for %s", action, i, (void *)shm, + balancer->s->name); + /* the below should always succeed */ + lbmethod = ap_lookup_provider(PROXY_LBMETHOD, balancer->s->lbpname, "0"); + if (lbmethod) { + balancer->lbmethod = lbmethod; + balancer->lbmethod_set = 1; + } else { + ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(02432) + "Cannot find LB Method: %s", balancer->s->lbpname); + return APR_EINVAL; + } + if (*balancer->s->nonce == PROXY_UNSET_NONCE) { + char nonce[APR_UUID_FORMATTED_LENGTH + 1]; + apr_uuid_t uuid; + + /* Generate a pseudo-UUID from the PRNG to use as a nonce for + * the lifetime of the process. uuid.data is a char array so + * this is an adequate substitute for apr_uuid_get(). */ + ap_random_insecure_bytes(uuid.data, sizeof uuid.data); + apr_uuid_format(nonce, &uuid); + rv = PROXY_STRNCPY(balancer->s->nonce, nonce); + } + return rv; +} + +PROXY_DECLARE(apr_status_t) ap_proxy_initialize_balancer(proxy_balancer *balancer, server_rec *s, apr_pool_t *p) +{ +#if APR_HAS_THREADS + apr_status_t rv = APR_SUCCESS; +#endif + ap_slotmem_provider_t *storage = balancer->storage; + apr_size_t size; + unsigned int num; + + if (!storage) { + ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00918) + "no provider for %s", balancer->s->name); + return APR_EGENERAL; + } + /* + * for each balancer we need to init the global + * mutex and then attach to the shared worker shm + */ + if (!balancer->gmutex) { + ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00919) + "no mutex %s", balancer->s->name); + return APR_EGENERAL; + } + + /* Re-open the mutex for the child. */ + rv = apr_global_mutex_child_init(&(balancer->gmutex), + apr_global_mutex_lockfile(balancer->gmutex), + p); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s, APLOGNO(00920) + "Failed to reopen mutex %s in child", + balancer->s->name); + return rv; + } + + /* now attach */ + storage->attach(&(balancer->wslot), balancer->s->sname, &size, &num, p); + if (!balancer->wslot) { + ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00921) "slotmem_attach failed"); + return APR_EGENERAL; + } + if (balancer->lbmethod && balancer->lbmethod->reset) + balancer->lbmethod->reset(balancer, s); + +#if APR_HAS_THREADS + if (balancer->tmutex == NULL) { + rv = apr_thread_mutex_create(&(balancer->tmutex), APR_THREAD_MUTEX_DEFAULT, p); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(00922) + "can not create balancer thread mutex"); + return rv; + } + } +#endif + return APR_SUCCESS; +} + +static proxy_worker *proxy_balancer_get_best_worker(proxy_balancer *balancer, + request_rec *r, + proxy_is_best_callback_fn_t *is_best, + void *baton) +{ + int i = 0; + int cur_lbset = 0; + int max_lbset = 0; + int unusable_workers = 0; + apr_pool_t *tpool = NULL; + apr_array_header_t *spares = NULL; + apr_array_header_t *standbys = NULL; + proxy_worker *worker = NULL; + proxy_worker *best_worker = NULL; + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, APLOGNO(10122) + "proxy: Entering %s for BALANCER (%s)", + balancer->lbmethod->name, balancer->s->name); + + apr_pool_create(&tpool, r->pool); + apr_pool_tag(tpool, "proxy_lb_best"); + + spares = apr_array_make(tpool, 1, sizeof(proxy_worker*)); + standbys = apr_array_make(tpool, 1, sizeof(proxy_worker*)); + + /* Process lbsets in order, only replacing unusable workers in a given lbset + * with available spares from the same lbset. Hot standbys will be used as a + * last resort when all other workers and spares are unavailable. + */ + for (cur_lbset = 0; !best_worker && (cur_lbset <= max_lbset); cur_lbset++) { + unusable_workers = 0; + apr_array_clear(spares); + apr_array_clear(standbys); + + for (i = 0; i < balancer->workers->nelts; i++) { + worker = APR_ARRAY_IDX(balancer->workers, i, proxy_worker *); + + if (worker->s->lbset > max_lbset) { + max_lbset = worker->s->lbset; + } + + if (worker->s->lbset != cur_lbset) { + continue; + } + + /* A draining worker that is neither a spare nor a standby should be + * considered unusable to be replaced by spares. + */ + if (PROXY_WORKER_IS_DRAINING(worker)) { + if (!PROXY_WORKER_IS_SPARE(worker) && !PROXY_WORKER_IS_STANDBY(worker)) { + unusable_workers++; + } + + continue; + } + + /* If the worker is in error state run retry on that worker. It will + * be marked as operational if the retry timeout is elapsed. The + * worker might still be unusable, but we try anyway. + */ + if (!PROXY_WORKER_IS_USABLE(worker)) { + ap_proxy_retry_worker("BALANCER", worker, r->server); + } + + if (PROXY_WORKER_IS_SPARE(worker)) { + if (PROXY_WORKER_IS_USABLE(worker)) { + APR_ARRAY_PUSH(spares, proxy_worker *) = worker; + } + } + else if (PROXY_WORKER_IS_STANDBY(worker)) { + if (PROXY_WORKER_IS_USABLE(worker)) { + APR_ARRAY_PUSH(standbys, proxy_worker *) = worker; + } + } + else if (PROXY_WORKER_IS_USABLE(worker)) { + if (is_best(worker, best_worker, baton)) { + best_worker = worker; + } + } + else { + unusable_workers++; + } + } + + /* Check if any spares are best. */ + for (i = 0; (i < spares->nelts) && (i < unusable_workers); i++) { + worker = APR_ARRAY_IDX(spares, i, proxy_worker *); + + if (is_best(worker, best_worker, baton)) { + best_worker = worker; + } + } + + /* If no workers are available, use the standbys. */ + if (!best_worker) { + for (i = 0; i < standbys->nelts; i++) { + worker = APR_ARRAY_IDX(standbys, i, proxy_worker *); + + if (is_best(worker, best_worker, baton)) { + best_worker = worker; + } + } + } + } + + apr_pool_destroy(tpool); + + if (best_worker) { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server, APLOGNO(10123) + "proxy: %s selected worker \"%s\" : busy %" APR_SIZE_T_FMT " : lbstatus %d", + balancer->lbmethod->name, best_worker->s->name_ex, + best_worker->s->busy, best_worker->s->lbstatus); + } + + return best_worker; +} + +PROXY_DECLARE(proxy_worker *) ap_proxy_balancer_get_best_worker(proxy_balancer *balancer, + request_rec *r, + proxy_is_best_callback_fn_t *is_best, + void *baton) +{ + return proxy_balancer_get_best_worker(balancer, r, is_best, baton); +} + +/* + * CONNECTION related... + */ + +static void socket_cleanup(proxy_conn_rec *conn) +{ + conn->sock = NULL; + conn->tmp_bb = NULL; + conn->connection = NULL; + conn->ssl_hostname = NULL; + apr_pool_clear(conn->scpool); +} + +static apr_status_t conn_pool_cleanup(void *theworker) +{ + ((proxy_worker *)theworker)->cp = NULL; + return APR_SUCCESS; +} + +static void init_conn_pool(apr_pool_t *p, proxy_worker *worker) +{ + apr_pool_t *pool; + apr_pool_t *dns_pool; + proxy_conn_pool *cp; + + /* + * Create a connection pool's subpool. + * This pool is used for connection recycling. + * Once the worker is added it is never removed but + * it can be disabled. + */ + apr_pool_create(&pool, p); + apr_pool_tag(pool, "proxy_worker_cp"); + /* + * Create a subpool of the connection pool for worker + * scoped DNS resolutions. This is needed to avoid race + * conditions in using the connection pool by multiple + * threads during ramp up. + */ + apr_pool_create(&dns_pool, pool); + apr_pool_tag(dns_pool, "proxy_worker_dns"); + /* + * Alloc from the same pool as worker. + * proxy_conn_pool is permanently attached to the worker. + */ + cp = (proxy_conn_pool *)apr_pcalloc(p, sizeof(proxy_conn_pool)); + cp->pool = pool; + cp->dns_pool = dns_pool; + worker->cp = cp; + + apr_pool_pre_cleanup_register(p, worker, conn_pool_cleanup); +} + +PROXY_DECLARE(int) ap_proxy_connection_reusable(proxy_conn_rec *conn) +{ + proxy_worker *worker = conn->worker; + + return ! (conn->close || !worker->s->is_address_reusable || worker->s->disablereuse); +} + +static apr_status_t connection_cleanup(void *theconn) +{ + proxy_conn_rec *conn = (proxy_conn_rec *)theconn; + proxy_worker *worker = conn->worker; + + if (conn->r) { + apr_pool_destroy(conn->r->pool); + conn->r = NULL; + } + + /* Sanity check: Did we already return the pooled connection? */ + if (conn->inreslist) { + ap_log_perror(APLOG_MARK, APLOG_ERR, 0, conn->pool, APLOGNO(00923) + "Pooled connection 0x%pp for worker %s has been" + " already returned to the connection pool.", conn, + ap_proxy_worker_name(conn->pool, worker)); + return APR_SUCCESS; + } + + /* determine if the connection need to be closed */ + if (!worker->s->is_address_reusable || worker->s->disablereuse) { + apr_pool_t *p = conn->pool; + apr_pool_clear(p); + conn = apr_pcalloc(p, sizeof(proxy_conn_rec)); + conn->pool = p; + conn->worker = worker; + apr_pool_create(&(conn->scpool), p); + apr_pool_tag(conn->scpool, "proxy_conn_scpool"); + } + else if (conn->close + || (conn->connection + && conn->connection->keepalive == AP_CONN_CLOSE)) { + socket_cleanup(conn); + conn->close = 0; + } + else if (conn->is_ssl) { + /* Unbind/reset the SSL connection dir config (sslconn->dc) from + * r->per_dir_config, r will likely get destroyed before this proxy + * conn is reused. + */ + ap_proxy_ssl_engine(conn->connection, worker->section_config, 1); + } + + if (worker->s->hmax && worker->cp->res) { + conn->inreslist = 1; + apr_reslist_release(worker->cp->res, (void *)conn); + } + else + { + worker->cp->conn = conn; + } + + /* Always return the SUCCESS */ + return APR_SUCCESS; +} + +/* DEPRECATED */ +PROXY_DECLARE(apr_status_t) ap_proxy_ssl_connection_cleanup(proxy_conn_rec *conn, + request_rec *r) +{ + apr_status_t rv; + + /* + * If we have an existing SSL connection it might be possible that the + * server sent some SSL message we have not read so far (e.g. an SSL + * shutdown message if the server closed the keepalive connection while + * the connection was held unused in our pool). + * So ensure that if present (=> APR_NONBLOCK_READ) it is read and + * processed. We don't expect any data to be in the returned brigade. + */ + if (conn->sock && conn->connection) { + rv = ap_get_brigade(conn->connection->input_filters, conn->tmp_bb, + AP_MODE_READBYTES, APR_NONBLOCK_READ, + HUGE_STRING_LEN); + if (!APR_BRIGADE_EMPTY(conn->tmp_bb)) { + apr_off_t len; + + rv = apr_brigade_length(conn->tmp_bb, 0, &len); + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, rv, r, + "SSL cleanup brigade contained %" + APR_OFF_T_FMT " bytes of data.", len); + apr_brigade_cleanup(conn->tmp_bb); + } + if ((rv != APR_SUCCESS) && !APR_STATUS_IS_EAGAIN(rv)) { + socket_cleanup(conn); + } + } + return APR_SUCCESS; +} + +/* reslist constructor */ +static apr_status_t connection_constructor(void **resource, void *params, + apr_pool_t *pool) +{ + apr_pool_t *ctx; + apr_pool_t *scpool; + proxy_conn_rec *conn; + proxy_worker *worker = (proxy_worker *)params; + + /* + * Create the subpool for each connection + * This keeps the memory consumption constant + * when disconnecting from backend. + */ + apr_pool_create(&ctx, pool); + apr_pool_tag(ctx, "proxy_conn_pool"); + /* + * Create another subpool that manages the data for the + * socket and the connection member of the proxy_conn_rec struct as we + * destroy this data more frequently than other data in the proxy_conn_rec + * struct like hostname and addr (at least in the case where we have + * keepalive connections that timed out). + */ + apr_pool_create(&scpool, ctx); + apr_pool_tag(scpool, "proxy_conn_scpool"); + conn = apr_pcalloc(ctx, sizeof(proxy_conn_rec)); + + conn->pool = ctx; + conn->scpool = scpool; + conn->worker = worker; + conn->inreslist = 1; + *resource = conn; + + return APR_SUCCESS; +} + +/* reslist destructor */ +static apr_status_t connection_destructor(void *resource, void *params, + apr_pool_t *pool) +{ + proxy_worker *worker = params; + + /* Destroy the pool only if not called from reslist_destroy */ + if (worker->cp) { + proxy_conn_rec *conn = resource; + apr_pool_destroy(conn->pool); + } + + return APR_SUCCESS; +} + +/* + * WORKER related... + */ + +PROXY_DECLARE(char *) ap_proxy_worker_name(apr_pool_t *p, + proxy_worker *worker) +{ + if (!(*worker->s->uds_path) || !p) { + /* just in case */ + return worker->s->name_ex; + } + return apr_pstrcat(p, "unix:", worker->s->uds_path, "|", worker->s->name_ex, NULL); +} + +PROXY_DECLARE(int) ap_proxy_worker_can_upgrade(apr_pool_t *p, + const proxy_worker *worker, + const char *upgrade, + const char *dflt) +{ + /* Find in worker->s->upgrade list (if any) */ + const char *worker_upgrade = worker->s->upgrade; + if (*worker_upgrade) { + return (strcmp(worker_upgrade, "*") == 0 + || ap_cstr_casecmp(worker_upgrade, upgrade) == 0 + || ap_find_token(p, worker_upgrade, upgrade)); + } + + /* Compare to the provided default (if any) */ + return (dflt && ap_cstr_casecmp(dflt, upgrade) == 0); +} + +/* + * Taken from ap_strcmp_match() : + * Match = 0, NoMatch = 1, Abort = -1, Inval = -2 + * Based loosely on sections of wildmat.c by Rich Salz + * Hmmm... shouldn't this really go component by component? + * + * Adds handling of the "\<any>" => "<any>" unescaping. + */ +static int ap_proxy_strcmp_ematch(const char *str, const char *expected) +{ + apr_size_t x, y; + + for (x = 0, y = 0; expected[y]; ++y, ++x) { + if (expected[y] == '$' && apr_isdigit(expected[y + 1])) { + do { + y += 2; + } while (expected[y] == '$' && apr_isdigit(expected[y + 1])); + if (!expected[y]) + return 0; + while (str[x]) { + int ret; + if ((ret = ap_proxy_strcmp_ematch(&str[x++], &expected[y])) != 1) + return ret; + } + return -1; + } + else if (!str[x]) { + return -1; + } + else if (expected[y] == '\\' && !expected[++y]) { + /* NUL is an invalid char! */ + return -2; + } + if (str[x] != expected[y]) + return 1; + } + /* We got all the way through the worker path without a difference */ + return 0; +} + +PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker_ex(apr_pool_t *p, + proxy_balancer *balancer, + proxy_server_conf *conf, + const char *url, + unsigned int mask) +{ + proxy_worker *worker; + proxy_worker *max_worker = NULL; + int max_match = 0; + int url_length; + int min_match; + int worker_name_length; + const char *c; + char *url_copy; + int i; + + if (!url) { + return NULL; + } + + if (!(mask & AP_PROXY_WORKER_NO_UDS)) { + url = ap_proxy_de_socketfy(p, url); + if (!url) { + return NULL; + } + } + + c = ap_strchr_c(url, ':'); + if (c == NULL || c[1] != '/' || c[2] != '/' || c[3] == '\0') { + return NULL; + } + + url_length = strlen(url); + url_copy = apr_pstrmemdup(p, url, url_length); + + /* Default to lookup for both _PREFIX and _MATCH workers */ + if (!(mask & (AP_PROXY_WORKER_IS_PREFIX | AP_PROXY_WORKER_IS_MATCH))) { + mask |= AP_PROXY_WORKER_IS_PREFIX | AP_PROXY_WORKER_IS_MATCH; + } + + /* + * We need to find the start of the path and + * therefore we know the length of the scheme://hostname/ + * part to we can force-lowercase everything up to + * the start of the path. + */ + c = ap_strchr_c(c+3, '/'); + if (c) { + char *pathstart; + pathstart = url_copy + (c - url); + *pathstart = '\0'; + ap_str_tolower(url_copy); + min_match = strlen(url_copy); + *pathstart = '/'; + } + else { + ap_str_tolower(url_copy); + min_match = strlen(url_copy); + } + /* + * Do a "longest match" on the worker name to find the worker that + * fits best to the URL, but keep in mind that we must have at least + * a minimum matching of length min_match such that + * scheme://hostname[:port] matches between worker and url. + */ + + if (balancer) { + proxy_worker **workers = (proxy_worker **)balancer->workers->elts; + for (i = 0; i < balancer->workers->nelts; i++, workers++) { + worker = *workers; + if ( ((worker_name_length = strlen(worker->s->name_ex)) <= url_length) + && (worker_name_length >= min_match) + && (worker_name_length > max_match) + && (worker->s->is_name_matchable + || ((mask & AP_PROXY_WORKER_IS_PREFIX) + && strncmp(url_copy, worker->s->name_ex, + worker_name_length) == 0)) + && (!worker->s->is_name_matchable + || ((mask & AP_PROXY_WORKER_IS_MATCH) + && ap_proxy_strcmp_ematch(url_copy, + worker->s->name_ex) == 0)) ) { + max_worker = worker; + max_match = worker_name_length; + } + } + } else { + worker = (proxy_worker *)conf->workers->elts; + for (i = 0; i < conf->workers->nelts; i++, worker++) { + if ( ((worker_name_length = strlen(worker->s->name_ex)) <= url_length) + && (worker_name_length >= min_match) + && (worker_name_length > max_match) + && (worker->s->is_name_matchable + || ((mask & AP_PROXY_WORKER_IS_PREFIX) + && strncmp(url_copy, worker->s->name_ex, + worker_name_length) == 0)) + && (!worker->s->is_name_matchable + || ((mask & AP_PROXY_WORKER_IS_MATCH) + && ap_proxy_strcmp_ematch(url_copy, + worker->s->name_ex) == 0)) ) { + max_worker = worker; + max_match = worker_name_length; + } + } + } + + return max_worker; +} + +PROXY_DECLARE(proxy_worker *) ap_proxy_get_worker(apr_pool_t *p, + proxy_balancer *balancer, + proxy_server_conf *conf, + const char *url) +{ + return ap_proxy_get_worker_ex(p, balancer, conf, url, 0); +} + +/* + * To create a worker from scratch first we define the + * specifics of the worker; this is all local data. + * We then allocate space for it if data needs to be + * shared. This allows for dynamic addition during + * config and runtime. + */ +PROXY_DECLARE(char *) ap_proxy_define_worker_ex(apr_pool_t *p, + proxy_worker **worker, + proxy_balancer *balancer, + proxy_server_conf *conf, + const char *url, + unsigned int mask) +{ + apr_status_t rv; + proxy_worker_shared *wshared; + const char *ptr = NULL, *sockpath = NULL, *pdollars = NULL; + apr_port_t port_of_scheme; + apr_uri_t uri; + + /* + * Look to see if we are using UDS: + * require format: unix:/path/foo/bar.sock|http://ignored/path2/ + * This results in talking http to the socket at /path/foo/bar.sock + */ + if (!ap_cstr_casecmpn(url, "unix:", 5) + && (ptr = ap_strchr_c(url + 5, '|'))) { + rv = apr_uri_parse(p, apr_pstrmemdup(p, url, ptr - url), &uri); + if (rv == APR_SUCCESS) { + sockpath = ap_runtime_dir_relative(p, uri.path);; + ptr++; /* so we get the scheme for the uds */ + } + else { + ptr = url; + } + } + else { + ptr = url; + } + + if (mask & AP_PROXY_WORKER_IS_MATCH) { + /* apr_uri_parse() will accept the '$' sign anywhere in the URL but + * in the :port part, and we don't want scheme://host:port$1$2/path + * to fail (e.g. "ProxyPassMatch ^/(a|b)(/.*)? http://host:port$2"). + * So we trim all the $n from the :port and prepend them in uri.path + * afterward for apr_uri_unparse() to restore the original URL below. + */ +#define IS_REF(x) (x[0] == '$' && apr_isdigit(x[1])) + const char *pos = ap_strstr_c(ptr, "://"); + if (pos) { + pos += 3; + while (*pos && *pos != ':' && *pos != '/') { + pos++; + } + if (*pos == ':') { + pos++; + while (*pos && !IS_REF(pos) && *pos != '/') { + pos++; + } + if (IS_REF(pos)) { + struct iovec vec[2]; + const char *path = pos + 2; + while (*path && *path != '/') { + path++; + } + pdollars = apr_pstrmemdup(p, pos, path - pos); + vec[0].iov_base = (void *)ptr; + vec[0].iov_len = pos - ptr; + vec[1].iov_base = (void *)path; + vec[1].iov_len = strlen(path); + ptr = apr_pstrcatv(p, vec, 2, NULL); + } + } + } +#undef IS_REF + } + + /* Normalize the url (worker name) */ + rv = apr_uri_parse(p, ptr, &uri); + if (rv != APR_SUCCESS) { + return apr_pstrcat(p, "Unable to parse URL: ", url, NULL); + } + if (!uri.scheme) { + return apr_pstrcat(p, "URL must be absolute!: ", url, NULL); + } + if (!uri.hostname) { + if (sockpath) { + /* allow for unix:/path|http: */ + uri.hostname = "localhost"; + } + else { + return apr_pstrcat(p, "URL must be absolute!: ", url, NULL); + } + } + else { + ap_str_tolower(uri.hostname); + } + ap_str_tolower(uri.scheme); + port_of_scheme = ap_proxy_port_of_scheme(uri.scheme); + if (uri.port && uri.port == port_of_scheme) { + uri.port = 0; + } + if (pdollars) { + /* Restore/prepend pdollars into the path. */ + uri.path = apr_pstrcat(p, pdollars, uri.path, NULL); + } + ptr = apr_uri_unparse(p, &uri, APR_URI_UNP_REVEALPASSWORD); + + /* + * Workers can be associated w/ balancers or on their + * own; ie: the generic reverse-proxy or a worker + * in a simple ProxyPass statement. eg: + * + * ProxyPass / http://www.example.com + * + * in which case the worker goes in the conf slot. + */ + if (balancer) { + proxy_worker **runtime; + /* recall that we get a ptr to the ptr here */ + runtime = apr_array_push(balancer->workers); + *worker = *runtime = apr_palloc(p, sizeof(proxy_worker)); /* right to left baby */ + /* we've updated the list of workers associated with + * this balancer *locally* */ + balancer->wupdated = apr_time_now(); + } else if (conf) { + *worker = apr_array_push(conf->workers); + } else { + /* we need to allocate space here */ + *worker = apr_palloc(p, sizeof(proxy_worker)); + } + memset(*worker, 0, sizeof(proxy_worker)); + + /* right here we just want to tuck away the worker info. + * if called during config, we don't have shm setup yet, + * so just note the info for later. */ + if (mask & AP_PROXY_WORKER_IS_MALLOCED) + wshared = ap_malloc(sizeof(proxy_worker_shared)); /* will be freed ap_proxy_share_worker */ + else + wshared = apr_palloc(p, sizeof(proxy_worker_shared)); + memset(wshared, 0, sizeof(proxy_worker_shared)); + + if (PROXY_STRNCPY(wshared->name_ex, ptr) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(10366) + "Alert! worker name (%s) too long; truncated to: %s", ptr, wshared->name_ex); + } + if (PROXY_STRNCPY(wshared->name, ptr) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(010118) + "worker name (%s) too long; truncated for legacy modules that do not use " + "proxy_worker_shared->name_ex: %s", ptr, wshared->name); + } + if (PROXY_STRNCPY(wshared->scheme, uri.scheme) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(010117) + "Alert! worker scheme (%s) too long; truncated to: %s", uri.scheme, wshared->scheme); + } + if (PROXY_STRNCPY(wshared->hostname_ex, uri.hostname) != APR_SUCCESS) { + return apr_psprintf(p, "worker hostname (%s) too long", uri.hostname); + } + if (PROXY_STRNCPY(wshared->hostname, uri.hostname) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(010118) + "worker hostname (%s) too long; truncated for legacy modules that do not use " + "proxy_worker_shared->hostname_ex: %s", uri.hostname, wshared->hostname); + } + wshared->port = (uri.port) ? uri.port : port_of_scheme; + wshared->flush_packets = flush_off; + wshared->flush_wait = PROXY_FLUSH_WAIT; + wshared->is_address_reusable = 1; + wshared->lbfactor = 100; + wshared->passes = 1; + wshared->fails = 1; + wshared->interval = apr_time_from_sec(HCHECK_WATHCHDOG_DEFAULT_INTERVAL); + wshared->smax = -1; + wshared->hash.def = ap_proxy_hashfunc(wshared->name_ex, PROXY_HASHFUNC_DEFAULT); + wshared->hash.fnv = ap_proxy_hashfunc(wshared->name_ex, PROXY_HASHFUNC_FNV); + wshared->was_malloced = (mask & AP_PROXY_WORKER_IS_MALLOCED) != 0; + wshared->is_name_matchable = 0; + if (sockpath) { + if (PROXY_STRNCPY(wshared->uds_path, sockpath) != APR_SUCCESS) { + return apr_psprintf(p, "worker uds path (%s) too long", sockpath); + } + + } + else { + *wshared->uds_path = '\0'; + } + if (!balancer) { + wshared->status |= PROXY_WORKER_IGNORE_ERRORS; + } + + (*worker)->hash = wshared->hash; + (*worker)->context = NULL; + (*worker)->cp = NULL; + (*worker)->balancer = balancer; + (*worker)->s = wshared; + + if (mask & AP_PROXY_WORKER_IS_MATCH) { + (*worker)->s->is_name_matchable = 1; + if (ap_strchr_c((*worker)->s->name_ex, '$')) { + /* Before AP_PROXY_WORKER_IS_MATCH (< 2.4.47), a regex worker + * with dollar substitution was never matched against the actual + * URL thus the request fell through the generic worker. To avoid + * dns and connection reuse compat issues, let's disable connection + * reuse by default, it can still be overwritten by an explicit + * enablereuse=on. + */ + (*worker)->s->disablereuse = 1; + } + } + + return NULL; +} + +PROXY_DECLARE(char *) ap_proxy_define_worker(apr_pool_t *p, + proxy_worker **worker, + proxy_balancer *balancer, + proxy_server_conf *conf, + const char *url, + int do_malloc) +{ + return ap_proxy_define_worker_ex(p, worker, balancer, conf, url, + AP_PROXY_WORKER_IS_PREFIX | + (do_malloc ? AP_PROXY_WORKER_IS_MALLOCED + : 0)); +} + +/* DEPRECATED */ +PROXY_DECLARE(char *) ap_proxy_define_match_worker(apr_pool_t *p, + proxy_worker **worker, + proxy_balancer *balancer, + proxy_server_conf *conf, + const char *url, + int do_malloc) +{ + return ap_proxy_define_worker_ex(p, worker, balancer, conf, url, + AP_PROXY_WORKER_IS_MATCH | + (do_malloc ? AP_PROXY_WORKER_IS_MALLOCED + : 0)); +} + +/* + * Create an already defined worker and free up memory + */ +PROXY_DECLARE(apr_status_t) ap_proxy_share_worker(proxy_worker *worker, proxy_worker_shared *shm, + int i) +{ + char *action = "copying"; + if (!shm || !worker->s) + return APR_EINVAL; + + if ((worker->s->hash.def != shm->hash.def) || + (worker->s->hash.fnv != shm->hash.fnv)) { + memcpy(shm, worker->s, sizeof(proxy_worker_shared)); + if (worker->s->was_malloced) + free(worker->s); /* was malloced in ap_proxy_define_worker */ + } else { + action = "re-using"; + } + worker->s = shm; + worker->s->index = i; + + if (APLOGdebug(ap_server_conf)) { + apr_pool_t *pool; + apr_pool_create(&pool, ap_server_conf->process->pool); + apr_pool_tag(pool, "proxy_worker_name"); + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(02338) + "%s shm[%d] (0x%pp) for worker: %s", action, i, (void *)shm, + ap_proxy_worker_name(pool, worker)); + if (pool) { + apr_pool_destroy(pool); + } + } + return APR_SUCCESS; +} + +PROXY_DECLARE(apr_status_t) ap_proxy_initialize_worker(proxy_worker *worker, server_rec *s, apr_pool_t *p) +{ + APR_OPTIONAL_FN_TYPE(http2_get_num_workers) *get_h2_num_workers; + apr_status_t rv = APR_SUCCESS; + int max_threads, minw, maxw; + + if (worker->s->status & PROXY_WORKER_INITIALIZED) { + /* The worker is already initialized */ + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00924) + "worker %s shared already initialized", + ap_proxy_worker_name(p, worker)); + } + else { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00925) + "initializing worker %s shared", + ap_proxy_worker_name(p, worker)); + /* Set default parameters */ + if (!worker->s->retry_set) { + worker->s->retry = apr_time_from_sec(PROXY_WORKER_DEFAULT_RETRY); + } + /* By default address is reusable unless DisableReuse is set */ + if (worker->s->disablereuse) { + worker->s->is_address_reusable = 0; + } + else { + worker->s->is_address_reusable = 1; + } + + /* + * When mod_http2 is loaded we might have more threads since it has + * its own pool of processing threads. + */ + ap_mpm_query(AP_MPMQ_MAX_THREADS, &max_threads); + get_h2_num_workers = APR_RETRIEVE_OPTIONAL_FN(http2_get_num_workers); + if (get_h2_num_workers) { + get_h2_num_workers(s, &minw, &maxw); + /* So now the max is: + * max_threads-1 threads for HTTP/1 each requiring one connection + * + one thread for HTTP/2 requiring maxw connections + */ + max_threads = max_threads - 1 + maxw; + } + if (max_threads > 1) { + /* Default hmax is max_threads to scale with the load and never + * wait for an idle connection to proceed. + */ + if (worker->s->hmax == 0) { + worker->s->hmax = max_threads; + } + if (worker->s->smax == -1 || worker->s->smax > worker->s->hmax) { + worker->s->smax = worker->s->hmax; + } + /* Set min to be lower than smax */ + if (worker->s->min > worker->s->smax) { + worker->s->min = worker->s->smax; + } + } + else { + /* This will suppress the apr_reslist creation */ + worker->s->min = worker->s->smax = worker->s->hmax = 0; + } + } + + /* What if local is init'ed and shm isn't?? Even possible? */ + if (worker->local_status & PROXY_WORKER_INITIALIZED) { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00926) + "worker %s local already initialized", + ap_proxy_worker_name(p, worker)); + } + else { + apr_global_mutex_lock(proxy_mutex); + /* Check again after we got the lock if we are still uninitialized */ + if (!(AP_VOLATILIZE_T(unsigned int, worker->local_status) & PROXY_WORKER_INITIALIZED)) { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00927) + "initializing worker %s local", + ap_proxy_worker_name(p, worker)); + /* Now init local worker data */ +#if APR_HAS_THREADS + if (worker->tmutex == NULL) { + rv = apr_thread_mutex_create(&(worker->tmutex), APR_THREAD_MUTEX_DEFAULT, p); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00928) + "can not create worker thread mutex"); + apr_global_mutex_unlock(proxy_mutex); + return rv; + } + } +#endif + if (worker->cp == NULL) + init_conn_pool(p, worker); + if (worker->cp == NULL) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00929) + "can not create connection pool"); + apr_global_mutex_unlock(proxy_mutex); + return APR_EGENERAL; + } + + if (worker->s->hmax) { + rv = apr_reslist_create(&(worker->cp->res), + worker->s->min, worker->s->smax, + worker->s->hmax, worker->s->ttl, + connection_constructor, connection_destructor, + worker, worker->cp->pool); + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00930) + "initialized pool in child %" APR_PID_T_FMT " for (%s:%d) min=%d max=%d smax=%d", + getpid(), worker->s->hostname_ex, (int)worker->s->port, + worker->s->min, worker->s->hmax, worker->s->smax); + + /* Set the acquire timeout */ + if (rv == APR_SUCCESS && worker->s->acquire_set) { + apr_reslist_timeout_set(worker->cp->res, worker->s->acquire); + } + + } + else { + void *conn; + + rv = connection_constructor(&conn, worker, worker->cp->pool); + worker->cp->conn = conn; + + ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, s, APLOGNO(00931) + "initialized single connection worker in child %" APR_PID_T_FMT " for (%s:%d)", + getpid(), worker->s->hostname_ex, + (int)worker->s->port); + } + if (rv == APR_SUCCESS) { + worker->local_status |= (PROXY_WORKER_INITIALIZED); + } + } + apr_global_mutex_unlock(proxy_mutex); + + } + if (rv == APR_SUCCESS) { + worker->s->status |= (PROXY_WORKER_INITIALIZED); + } + return rv; +} + +static int ap_proxy_retry_worker(const char *proxy_function, proxy_worker *worker, + server_rec *s) +{ + if (worker->s->status & PROXY_WORKER_IN_ERROR) { + if (PROXY_WORKER_IS(worker, PROXY_WORKER_STOPPED)) { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(3305) + "%s: Won't retry worker (%s:%d): stopped", + proxy_function, worker->s->hostname_ex, + (int)worker->s->port); + return DECLINED; + } + if ((worker->s->status & PROXY_WORKER_IGNORE_ERRORS) + || apr_time_now() > worker->s->error_time + worker->s->retry) { + ++worker->s->retries; + worker->s->status &= ~PROXY_WORKER_IN_ERROR; + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00932) + "%s: worker for (%s:%d) has been marked for retry", + proxy_function, worker->s->hostname_ex, + (int)worker->s->port); + return OK; + } + else { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00933) + "%s: too soon to retry worker for (%s:%d)", + proxy_function, worker->s->hostname_ex, + (int)worker->s->port); + return DECLINED; + } + } + else { + return OK; + } +} + +/* + * In the case of the reverse proxy, we need to see if we + * were passed a UDS url (eg: from mod_proxy) and adjust uds_path + * as required. + */ +static int fix_uds_filename(request_rec *r, char **url) +{ + char *uds_url = r->filename + 6, *origin_url; + + if (!strncmp(r->filename, "proxy:", 6) && + !ap_cstr_casecmpn(uds_url, "unix:", 5) && + (origin_url = ap_strchr(uds_url + 5, '|'))) { + char *uds_path = NULL; + apr_size_t url_len; + apr_uri_t urisock; + apr_status_t rv; + + *origin_url = '\0'; + rv = apr_uri_parse(r->pool, uds_url, &urisock); + *origin_url++ = '|'; + + if (rv == APR_SUCCESS && urisock.path && (!urisock.hostname + || !urisock.hostname[0])) { + uds_path = ap_runtime_dir_relative(r->pool, urisock.path); + } + if (!uds_path) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10292) + "Invalid proxy UDS filename (%s)", r->filename); + return 0; + } + apr_table_setn(r->notes, "uds_path", uds_path); + + /* Remove the UDS path from *url and r->filename */ + url_len = strlen(origin_url); + *url = apr_pstrmemdup(r->pool, origin_url, url_len); + memcpy(uds_url, *url, url_len + 1); + + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "*: rewrite of url due to UDS(%s): %s (%s)", + uds_path, *url, r->filename); + } + return 1; +} + +PROXY_DECLARE(int) ap_proxy_pre_request(proxy_worker **worker, + proxy_balancer **balancer, + request_rec *r, + proxy_server_conf *conf, char **url) +{ + int access_status; + + access_status = proxy_run_pre_request(worker, balancer, r, conf, url); + if (access_status == DECLINED && *balancer == NULL) { + const int forward = (r->proxyreq == PROXYREQ_PROXY); + *worker = ap_proxy_get_worker_ex(r->pool, NULL, conf, *url, + forward ? AP_PROXY_WORKER_NO_UDS : 0); + if (*worker) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "%s: found worker %s for %s", + (*worker)->s->scheme, (*worker)->s->name_ex, *url); + if (!forward && !fix_uds_filename(r, url)) { + return HTTP_INTERNAL_SERVER_ERROR; + } + access_status = OK; + } + else if (forward) { + if (conf->forward) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "*: found forward proxy worker for %s", *url); + *worker = conf->forward; + access_status = OK; + /* + * The forward worker does not keep connections alive, so + * ensure that mod_proxy_http does the correct thing + * regarding the Connection header in the request. + */ + apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1"); + } + } + else if (r->proxyreq == PROXYREQ_REVERSE) { + if (conf->reverse) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "*: using default reverse proxy worker for %s " + "(no keepalive)", *url); + *worker = conf->reverse; + access_status = OK; + /* + * The reverse worker does not keep connections alive, so + * ensure that mod_proxy_http does the correct thing + * regarding the Connection header in the request. + */ + apr_table_setn(r->subprocess_env, "proxy-nokeepalive", "1"); + if (!fix_uds_filename(r, url)) { + return HTTP_INTERNAL_SERVER_ERROR; + } + } + } + } + else if (access_status == DECLINED && *balancer != NULL) { + /* All the workers are busy */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00934) + "all workers are busy. Unable to serve %s", *url); + access_status = HTTP_SERVICE_UNAVAILABLE; + } + return access_status; +} + +PROXY_DECLARE(int) ap_proxy_post_request(proxy_worker *worker, + proxy_balancer *balancer, + request_rec *r, + proxy_server_conf *conf) +{ + int access_status = OK; + if (balancer) { + access_status = proxy_run_post_request(worker, balancer, r, conf); + if (access_status == DECLINED) { + access_status = OK; /* no post_request handler available */ + /* TODO: recycle direct worker */ + } + } + + return access_status; +} + +/* DEPRECATED */ +PROXY_DECLARE(int) ap_proxy_connect_to_backend(apr_socket_t **newsock, + const char *proxy_function, + apr_sockaddr_t *backend_addr, + const char *backend_name, + proxy_server_conf *conf, + request_rec *r) +{ + apr_status_t rv; + int connected = 0; + int loglevel; + + while (backend_addr && !connected) { + if ((rv = apr_socket_create(newsock, backend_addr->family, + SOCK_STREAM, 0, r->pool)) != APR_SUCCESS) { + loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR; + ap_log_rerror(APLOG_MARK, loglevel, rv, r, APLOGNO(00935) + "%s: error creating fam %d socket for target %s", + proxy_function, backend_addr->family, backend_name); + /* + * this could be an IPv6 address from the DNS but the + * local machine won't give us an IPv6 socket; hopefully the + * DNS returned an additional address to try + */ + backend_addr = backend_addr->next; + continue; + } + + if (conf->recv_buffer_size > 0 && + (rv = apr_socket_opt_set(*newsock, APR_SO_RCVBUF, + conf->recv_buffer_size))) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00936) + "apr_socket_opt_set(SO_RCVBUF): Failed to set " + "ProxyReceiveBufferSize, using default"); + } + + rv = apr_socket_opt_set(*newsock, APR_TCP_NODELAY, 1); + if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00937) + "apr_socket_opt_set(APR_TCP_NODELAY): " + "Failed to set"); + } + + /* Set a timeout on the socket */ + if (conf->timeout_set) { + apr_socket_timeout_set(*newsock, conf->timeout); + } + else { + apr_socket_timeout_set(*newsock, r->server->timeout); + } + + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "%s: fam %d socket created to connect to %s", + proxy_function, backend_addr->family, backend_name); + + if (conf->source_address) { + apr_sockaddr_t *local_addr; + /* Make a copy since apr_socket_bind() could change + * conf->source_address, which we don't want. + */ + local_addr = apr_pmemdup(r->pool, conf->source_address, + sizeof(apr_sockaddr_t)); + local_addr->pool = r->pool; + rv = apr_socket_bind(*newsock, local_addr); + if (rv != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00938) + "%s: failed to bind socket to local address", + proxy_function); + } + } + + /* make the connection out of the socket */ + rv = apr_socket_connect(*newsock, backend_addr); + + /* if an error occurred, loop round and try again */ + if (rv != APR_SUCCESS) { + apr_socket_close(*newsock); + loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR; + ap_log_rerror(APLOG_MARK, loglevel, rv, r, APLOGNO(00939) + "%s: attempt to connect to %pI (%s) failed", + proxy_function, backend_addr, backend_name); + backend_addr = backend_addr->next; + continue; + } + connected = 1; + } + return connected ? 0 : 1; +} + +PROXY_DECLARE(int) ap_proxy_acquire_connection(const char *proxy_function, + proxy_conn_rec **conn, + proxy_worker *worker, + server_rec *s) +{ + apr_status_t rv; + + if (!PROXY_WORKER_IS_USABLE(worker)) { + /* Retry the worker */ + ap_proxy_retry_worker(proxy_function, worker, s); + + if (!PROXY_WORKER_IS_USABLE(worker)) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00940) + "%s: disabled connection for (%s:%d)", + proxy_function, worker->s->hostname_ex, + (int)worker->s->port); + return HTTP_SERVICE_UNAVAILABLE; + } + } + + if (worker->s->hmax && worker->cp->res) { + rv = apr_reslist_acquire(worker->cp->res, (void **)conn); + } + else { + /* create the new connection if the previous was destroyed */ + if (!worker->cp->conn) { + rv = connection_constructor((void **)conn, worker, worker->cp->pool); + } + else { + *conn = worker->cp->conn; + worker->cp->conn = NULL; + rv = APR_SUCCESS; + } + } + + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00941) + "%s: failed to acquire connection for (%s:%d)", + proxy_function, worker->s->hostname_ex, + (int)worker->s->port); + return HTTP_SERVICE_UNAVAILABLE; + } + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00942) + "%s: has acquired connection for (%s:%d)", + proxy_function, worker->s->hostname_ex, + (int)worker->s->port); + + (*conn)->worker = worker; + (*conn)->close = 0; + (*conn)->inreslist = 0; + + return OK; +} + +PROXY_DECLARE(int) ap_proxy_release_connection(const char *proxy_function, + proxy_conn_rec *conn, + server_rec *s) +{ + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00943) + "%s: has released connection for (%s:%d)", + proxy_function, conn->worker->s->hostname_ex, + (int)conn->worker->s->port); + connection_cleanup(conn); + + return OK; +} + +PROXY_DECLARE(int) +ap_proxy_determine_connection(apr_pool_t *p, request_rec *r, + proxy_server_conf *conf, + proxy_worker *worker, + proxy_conn_rec *conn, + apr_uri_t *uri, + char **url, + const char *proxyname, + apr_port_t proxyport, + char *server_portstr, + int server_portstr_size) +{ + int server_port; + apr_status_t err = APR_SUCCESS; +#if APR_HAS_THREADS + apr_status_t uerr = APR_SUCCESS; +#endif + const char *uds_path; + + /* + * Break up the URL to determine the host to connect to + */ + + /* we break the URL into host, port, uri */ + if (APR_SUCCESS != apr_uri_parse(p, *url, uri)) { + return ap_proxyerror(r, HTTP_BAD_REQUEST, + apr_pstrcat(p,"URI cannot be parsed: ", *url, + NULL)); + } + if (!uri->port) { + uri->port = ap_proxy_port_of_scheme(uri->scheme); + } + + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00944) + "connecting %s to %s:%d", *url, uri->hostname, uri->port); + + /* + * allocate these out of the specified connection pool + * The scheme handler decides if this is permanent or + * short living pool. + */ + /* Unless we are connecting the backend via a (forward Proxy)Remote, we + * have to use the original form of the URI (non absolute), but this is + * also the case via a remote proxy using the CONNECT method since the + * original request (and URI) is to be embedded in the body. + */ + if (!proxyname || conn->is_ssl) { + *url = apr_pstrcat(p, uri->path, uri->query ? "?" : "", + uri->query ? uri->query : "", + uri->fragment ? "#" : "", + uri->fragment ? uri->fragment : "", NULL); + } + /* + * Figure out if our passed in proxy_conn_rec has a usable + * address cached. + * + * TODO: Handle this much better... + * + * XXX: If generic workers are ever address-reusable, we need + * to check host and port on the conn and be careful about + * spilling the cached addr from the worker. + */ + uds_path = (*worker->s->uds_path ? worker->s->uds_path : apr_table_get(r->notes, "uds_path")); + if (uds_path) { + if (conn->uds_path == NULL) { + /* use (*conn)->pool instead of worker->cp->pool to match lifetime */ + conn->uds_path = apr_pstrdup(conn->pool, uds_path); + } + if (conn->uds_path) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02545) + "%s: has determined UDS as %s", + uri->scheme, conn->uds_path); + } + else { + /* should never happen */ + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02546) + "%s: cannot determine UDS (%s)", + uri->scheme, uds_path); + + } + /* + * In UDS cases, some structs are NULL. Protect from de-refs + * and provide info for logging at the same time. + */ + if (!conn->addr) { + apr_sockaddr_t *sa; + apr_sockaddr_info_get(&sa, NULL, APR_UNSPEC, 0, 0, conn->pool); + conn->addr = sa; + } + conn->hostname = "httpd-UDS"; + conn->port = 0; + } + else { + int will_reuse = worker->s->is_address_reusable && !worker->s->disablereuse; + if (!conn->hostname || !will_reuse) { + if (proxyname) { + conn->hostname = apr_pstrdup(conn->pool, proxyname); + conn->port = proxyport; + /* + * If we have a forward proxy and the protocol is HTTPS, + * then we need to prepend a HTTP CONNECT request before + * sending our actual HTTPS requests. + * Save our real backend data for using it later during HTTP CONNECT. + */ + if (conn->is_ssl) { + const char *proxy_auth; + + forward_info *forward = apr_pcalloc(conn->pool, sizeof(forward_info)); + conn->forward = forward; + forward->use_http_connect = 1; + forward->target_host = apr_pstrdup(conn->pool, uri->hostname); + forward->target_port = uri->port; + /* Do we want to pass Proxy-Authorization along? + * If we haven't used it, then YES + * If we have used it then MAYBE: RFC2616 says we MAY propagate it. + * So let's make it configurable by env. + * The logic here is the same used in mod_proxy_http. + */ + proxy_auth = apr_table_get(r->headers_in, "Proxy-Authorization"); + if (proxy_auth != NULL && + proxy_auth[0] != '\0' && + r->user == NULL && /* we haven't yet authenticated */ + apr_table_get(r->subprocess_env, "Proxy-Chain-Auth")) { + forward->proxy_auth = apr_pstrdup(conn->pool, proxy_auth); + } + } + } + else { + conn->hostname = apr_pstrdup(conn->pool, uri->hostname); + conn->port = uri->port; + } + if (!will_reuse) { + /* + * Only do a lookup if we should not reuse the backend address. + * Otherwise we will look it up once for the worker. + */ + err = apr_sockaddr_info_get(&(conn->addr), + conn->hostname, APR_UNSPEC, + conn->port, 0, + conn->pool); + } + socket_cleanup(conn); + conn->close = 0; + } + if (will_reuse) { + /* + * Looking up the backend address for the worker only makes sense if + * we can reuse the address. + */ + if (!worker->cp->addr) { +#if APR_HAS_THREADS + if ((err = PROXY_THREAD_LOCK(worker)) != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, err, r, APLOGNO(00945) "lock"); + return HTTP_INTERNAL_SERVER_ERROR; + } +#endif + + /* + * Recheck addr after we got the lock. This may have changed + * while waiting for the lock. + */ + if (!AP_VOLATILIZE_T(apr_sockaddr_t *, worker->cp->addr)) { + + apr_sockaddr_t *addr; + + /* + * Worker can have the single constant backend address. + * The single DNS lookup is used once per worker. + * If dynamic change is needed then set the addr to NULL + * inside dynamic config to force the lookup. + */ + err = apr_sockaddr_info_get(&addr, + conn->hostname, APR_UNSPEC, + conn->port, 0, + worker->cp->dns_pool); + worker->cp->addr = addr; + } + conn->addr = worker->cp->addr; +#if APR_HAS_THREADS + if ((uerr = PROXY_THREAD_UNLOCK(worker)) != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, uerr, r, APLOGNO(00946) "unlock"); + } +#endif + } + else { + conn->addr = worker->cp->addr; + } + } + } + /* Close a possible existing socket if we are told to do so */ + if (conn->close) { + socket_cleanup(conn); + conn->close = 0; + } + + if (err != APR_SUCCESS) { + return ap_proxyerror(r, HTTP_BAD_GATEWAY, + apr_pstrcat(p, "DNS lookup failure for: ", + conn->hostname, NULL)); + } + + /* Get the server port for the Via headers */ + server_port = ap_get_server_port(r); + AP_DEBUG_ASSERT(server_portstr_size > 0); + if (ap_is_default_port(server_port, r)) { + server_portstr[0] = '\0'; + } + else { + apr_snprintf(server_portstr, server_portstr_size, ":%d", + server_port); + } + + /* check if ProxyBlock directive on this host */ + if (OK != ap_proxy_checkproxyblock2(r, conf, uri->hostname, + proxyname ? NULL : conn->addr)) { + return ap_proxyerror(r, HTTP_FORBIDDEN, + "Connect to remote machine blocked"); + } + /* + * When SSL is configured, determine the hostname (SNI) for the request + * and save it in conn->ssl_hostname. Close any reused connection whose + * SNI differs. + */ + if (conn->is_ssl) { + proxy_dir_conf *dconf; + const char *ssl_hostname; + /* + * In the case of ProxyPreserveHost on use the hostname of + * the request if present otherwise use the one from the + * backend request URI. + */ + dconf = ap_get_module_config(r->per_dir_config, &proxy_module); + if (dconf->preserve_host) { + ssl_hostname = r->hostname; + } + else if (conn->forward + && ((forward_info *)(conn->forward))->use_http_connect) { + ssl_hostname = ((forward_info *)conn->forward)->target_host; + } + else { + ssl_hostname = conn->hostname; + } + /* + * Close if a SNI is in use but this request requires no or + * a different one, or no SNI is in use but one is required. + */ + if ((conn->ssl_hostname && (!ssl_hostname || + strcasecmp(conn->ssl_hostname, + ssl_hostname) != 0)) || + (!conn->ssl_hostname && ssl_hostname && conn->sock)) { + socket_cleanup(conn); + } + if (conn->ssl_hostname == NULL) { + conn->ssl_hostname = apr_pstrdup(conn->scpool, ssl_hostname); + } + } + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00947) + "connected %s to %s:%d", *url, conn->hostname, conn->port); + return OK; +} + +#define USE_ALTERNATE_IS_CONNECTED 1 + +#if !defined(APR_MSG_PEEK) && defined(MSG_PEEK) +#define APR_MSG_PEEK MSG_PEEK +#endif + +#if USE_ALTERNATE_IS_CONNECTED && defined(APR_MSG_PEEK) +PROXY_DECLARE(int) ap_proxy_is_socket_connected(apr_socket_t *socket) +{ + apr_pollfd_t pfds[1]; + apr_status_t status; + apr_int32_t nfds; + + pfds[0].reqevents = APR_POLLIN; + pfds[0].desc_type = APR_POLL_SOCKET; + pfds[0].desc.s = socket; + + do { + status = apr_poll(&pfds[0], 1, &nfds, 0); + } while (APR_STATUS_IS_EINTR(status)); + + if (status == APR_SUCCESS && nfds == 1 && + pfds[0].rtnevents == APR_POLLIN) { + apr_sockaddr_t unused; + apr_size_t len = 1; + char buf[1]; + /* The socket might be closed in which case + * the poll will return POLLIN. + * If there is no data available the socket + * is closed. + */ + status = apr_socket_recvfrom(&unused, socket, APR_MSG_PEEK, + &buf[0], &len); + if (status == APR_SUCCESS && len) + return 1; + else + return 0; + } + else if (APR_STATUS_IS_EAGAIN(status) || APR_STATUS_IS_TIMEUP(status)) { + return 1; + } + return 0; + +} +#else +PROXY_DECLARE(int) ap_proxy_is_socket_connected(apr_socket_t *sock) + +{ + apr_size_t buffer_len = 1; + char test_buffer[1]; + apr_status_t socket_status; + apr_interval_time_t current_timeout; + + /* save timeout */ + apr_socket_timeout_get(sock, ¤t_timeout); + /* set no timeout */ + apr_socket_timeout_set(sock, 0); + socket_status = apr_socket_recv(sock, test_buffer, &buffer_len); + /* put back old timeout */ + apr_socket_timeout_set(sock, current_timeout); + if (APR_STATUS_IS_EOF(socket_status) + || APR_STATUS_IS_ECONNRESET(socket_status)) { + return 0; + } + else { + return 1; + } +} +#endif /* USE_ALTERNATE_IS_CONNECTED */ + + +/* + * Send a HTTP CONNECT request to a forward proxy. + * The proxy is given by "backend", the target server + * is contained in the "forward" member of "backend". + */ +static apr_status_t send_http_connect(proxy_conn_rec *backend, + server_rec *s) +{ + int status; + apr_size_t nbytes; + apr_size_t left; + int complete = 0; + char buffer[HUGE_STRING_LEN]; + char drain_buffer[HUGE_STRING_LEN]; + forward_info *forward = (forward_info *)backend->forward; + int len = 0; + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00948) + "CONNECT: sending the CONNECT request for %s:%d " + "to the remote proxy %pI (%s)", + forward->target_host, forward->target_port, + backend->addr, backend->hostname); + /* Create the CONNECT request */ + nbytes = apr_snprintf(buffer, sizeof(buffer), + "CONNECT %s:%d HTTP/1.0" CRLF, + forward->target_host, forward->target_port); + /* Add proxy authorization from the initial request if necessary */ + if (forward->proxy_auth != NULL) { + nbytes += apr_snprintf(buffer + nbytes, sizeof(buffer) - nbytes, + "Proxy-Authorization: %s" CRLF, + forward->proxy_auth); + } + /* Set a reasonable agent and send everything */ + nbytes += apr_snprintf(buffer + nbytes, sizeof(buffer) - nbytes, + "Proxy-agent: %s" CRLF CRLF, + ap_get_server_banner()); + ap_xlate_proto_to_ascii(buffer, nbytes); + apr_socket_send(backend->sock, buffer, &nbytes); + + /* Receive the whole CONNECT response */ + left = sizeof(buffer) - 1; + /* Read until we find the end of the headers or run out of buffer */ + do { + nbytes = left; + status = apr_socket_recv(backend->sock, buffer + len, &nbytes); + len += nbytes; + left -= nbytes; + buffer[len] = '\0'; + if (strstr(buffer + len - nbytes, CRLF_ASCII CRLF_ASCII) != NULL) { + ap_xlate_proto_from_ascii(buffer, len); + complete = 1; + break; + } + } while (status == APR_SUCCESS && left > 0); + /* Drain what's left */ + if (!complete) { + nbytes = sizeof(drain_buffer) - 1; + while (status == APR_SUCCESS && nbytes) { + status = apr_socket_recv(backend->sock, drain_buffer, &nbytes); + drain_buffer[nbytes] = '\0'; + nbytes = sizeof(drain_buffer) - 1; + if (strstr(drain_buffer, CRLF_ASCII CRLF_ASCII) != NULL) { + break; + } + } + } + + /* Check for HTTP_OK response status */ + if (status == APR_SUCCESS) { + unsigned int major, minor; + /* Only scan for three character status code */ + char code_str[4]; + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00949) + "send_http_connect: response from the forward proxy: %s", + buffer); + + /* Extract the returned code */ + if (sscanf(buffer, "HTTP/%u.%u %3s", &major, &minor, code_str) == 3) { + status = atoi(code_str); + if (status == HTTP_OK) { + status = APR_SUCCESS; + } + else { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00950) + "send_http_connect: the forward proxy returned code is '%s'", + code_str); + status = APR_INCOMPLETE; + } + } + } + + return(status); +} + + +/* TODO: In APR 2.x: Extend apr_sockaddr_t to possibly be a path !!! */ +PROXY_DECLARE(apr_status_t) ap_proxy_connect_uds(apr_socket_t *sock, + const char *uds_path, + apr_pool_t *p) +{ +#if APR_HAVE_SYS_UN_H + apr_status_t rv; + apr_os_sock_t rawsock; + apr_interval_time_t t; + struct sockaddr_un *sa; + apr_socklen_t addrlen, pathlen; + + rv = apr_os_sock_get(&rawsock, sock); + if (rv != APR_SUCCESS) { + return rv; + } + + rv = apr_socket_timeout_get(sock, &t); + if (rv != APR_SUCCESS) { + return rv; + } + + pathlen = strlen(uds_path); + /* copy the UDS path (including NUL) to the sockaddr_un */ + addrlen = APR_OFFSETOF(struct sockaddr_un, sun_path) + pathlen; + sa = (struct sockaddr_un *)apr_palloc(p, addrlen + 1); + memcpy(sa->sun_path, uds_path, pathlen + 1); + sa->sun_family = AF_UNIX; + + do { + rv = connect(rawsock, (struct sockaddr*)sa, addrlen); + } while (rv == -1 && (rv = errno) == EINTR); + + if (rv && rv != EISCONN) { + if ((rv == EINPROGRESS || rv == EALREADY) && (t > 0)) { +#if APR_MAJOR_VERSION < 2 + rv = apr_wait_for_io_or_timeout(NULL, sock, 0); +#else + rv = apr_socket_wait(sock, APR_WAIT_WRITE); +#endif + } + if (rv != APR_SUCCESS) { + return rv; + } + } + + return APR_SUCCESS; +#else + return APR_ENOTIMPL; +#endif +} + +PROXY_DECLARE(apr_status_t) ap_proxy_check_connection(const char *scheme, + proxy_conn_rec *conn, + server_rec *server, + unsigned max_blank_lines, + int flags) +{ + apr_status_t rv = APR_SUCCESS; + proxy_worker *worker = conn->worker; + + if (!PROXY_WORKER_IS_USABLE(worker)) { + /* + * The worker is in error likely done by a different thread / process + * e.g. for a timeout or bad status. We should respect this and should + * not continue with a connection via this worker even if we got one. + */ + rv = APR_EINVAL; + } + else if (conn->connection) { + /* We have a conn_rec, check the full filter stack for things like + * SSL alert/shutdown, filters aside data... + */ + rv = ap_check_pipeline(conn->connection, conn->tmp_bb, + max_blank_lines); + apr_brigade_cleanup(conn->tmp_bb); + if (rv == APR_SUCCESS) { + /* Some data available, the caller might not want them. */ + if (flags & PROXY_CHECK_CONN_EMPTY) { + rv = APR_ENOTEMPTY; + } + } + else if (APR_STATUS_IS_EAGAIN(rv)) { + /* Filter chain is OK and empty, yet we can't determine from + * ap_check_pipeline (actually ap_core_input_filter) whether + * an empty non-blocking read is EAGAIN or EOF on the socket + * side (it's always SUCCESS), so check it explicitly here. + */ + if (ap_proxy_is_socket_connected(conn->sock)) { + rv = APR_SUCCESS; + } + else { + rv = APR_EPIPE; + } + } + } + else if (conn->sock) { + /* For modules working with sockets directly, check it. */ + if (!ap_proxy_is_socket_connected(conn->sock)) { + rv = APR_EPIPE; + } + } + else { + rv = APR_ENOSOCKET; + } + + if (rv == APR_SUCCESS) { + if (APLOGtrace2(server)) { + apr_sockaddr_t *local_addr = NULL; + apr_socket_addr_get(&local_addr, APR_LOCAL, conn->sock); + ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, server, + "%s: reusing backend connection %pI<>%pI", + scheme, local_addr, conn->addr); + } + } + else if (conn->sock) { + /* This clears conn->scpool (and associated data), so backup and + * restore any ssl_hostname for this connection set earlier by + * ap_proxy_determine_connection(). + */ + char ssl_hostname[PROXY_WORKER_RFC1035_NAME_SIZE]; + if (rv == APR_EINVAL + || !conn->ssl_hostname + || PROXY_STRNCPY(ssl_hostname, conn->ssl_hostname)) { + ssl_hostname[0] = '\0'; + } + + socket_cleanup(conn); + if (rv != APR_ENOTEMPTY) { + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, server, APLOGNO(00951) + "%s: backend socket is disconnected.", scheme); + } + else { + ap_log_error(APLOG_MARK, APLOG_INFO, 0, server, APLOGNO(03408) + "%s: reusable backend connection is not empty: " + "forcibly closed", scheme); + } + + if (ssl_hostname[0]) { + conn->ssl_hostname = apr_pstrdup(conn->scpool, ssl_hostname); + } + } + + return rv; +} + +PROXY_DECLARE(int) ap_proxy_connect_backend(const char *proxy_function, + proxy_conn_rec *conn, + proxy_worker *worker, + server_rec *s) +{ + apr_status_t rv; + int loglevel; + apr_sockaddr_t *backend_addr = conn->addr; + /* the local address to use for the outgoing connection */ + apr_sockaddr_t *local_addr; + apr_socket_t *newsock; + void *sconf = s->module_config; + proxy_server_conf *conf = + (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module); + + rv = ap_proxy_check_connection(proxy_function, conn, s, 0, 0); + if (rv == APR_EINVAL) { + return DECLINED; + } + + while (rv != APR_SUCCESS && (backend_addr || conn->uds_path)) { +#if APR_HAVE_SYS_UN_H + if (conn->uds_path) + { + rv = apr_socket_create(&newsock, AF_UNIX, SOCK_STREAM, 0, + conn->scpool); + if (rv != APR_SUCCESS) { + loglevel = APLOG_ERR; + ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(02453) + "%s: error creating Unix domain socket for " + "target %s:%d", + proxy_function, + worker->s->hostname_ex, + (int)worker->s->port); + break; + } + conn->connection = NULL; + + rv = ap_proxy_connect_uds(newsock, conn->uds_path, conn->scpool); + if (rv != APR_SUCCESS) { + apr_socket_close(newsock); + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(02454) + "%s: attempt to connect to Unix domain socket " + "%s (%s:%d) failed", + proxy_function, + conn->uds_path, + worker->s->hostname_ex, + (int)worker->s->port); + break; + } + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02823) + "%s: connection established with Unix domain socket " + "%s (%s:%d)", + proxy_function, + conn->uds_path, + worker->s->hostname_ex, + (int)worker->s->port); + } + else +#endif + { + if ((rv = apr_socket_create(&newsock, backend_addr->family, + SOCK_STREAM, APR_PROTO_TCP, + conn->scpool)) != APR_SUCCESS) { + loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR; + ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00952) + "%s: error creating fam %d socket for " + "target %s:%d", + proxy_function, + backend_addr->family, + worker->s->hostname_ex, + (int)worker->s->port); + /* + * this could be an IPv6 address from the DNS but the + * local machine won't give us an IPv6 socket; hopefully the + * DNS returned an additional address to try + */ + backend_addr = backend_addr->next; + continue; + } + conn->connection = NULL; + + if (worker->s->recv_buffer_size > 0 && + (rv = apr_socket_opt_set(newsock, APR_SO_RCVBUF, + worker->s->recv_buffer_size))) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00953) + "apr_socket_opt_set(SO_RCVBUF): Failed to set " + "ProxyReceiveBufferSize, using default"); + } + + rv = apr_socket_opt_set(newsock, APR_TCP_NODELAY, 1); + if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00954) + "apr_socket_opt_set(APR_TCP_NODELAY): " + "Failed to set"); + } + + /* Set a timeout for connecting to the backend on the socket */ + if (worker->s->conn_timeout_set) { + apr_socket_timeout_set(newsock, worker->s->conn_timeout); + } + else if (worker->s->timeout_set) { + apr_socket_timeout_set(newsock, worker->s->timeout); + } + else if (conf->timeout_set) { + apr_socket_timeout_set(newsock, conf->timeout); + } + else { + apr_socket_timeout_set(newsock, s->timeout); + } + /* Set a keepalive option */ + if (worker->s->keepalive) { + if ((rv = apr_socket_opt_set(newsock, + APR_SO_KEEPALIVE, 1)) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00955) + "apr_socket_opt_set(SO_KEEPALIVE): Failed to set" + " Keepalive"); + } + } + ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, s, + "%s: fam %d socket created to connect to %s:%d", + proxy_function, backend_addr->family, + worker->s->hostname_ex, (int)worker->s->port); + + if (conf->source_address_set) { + local_addr = apr_pmemdup(conn->scpool, conf->source_address, + sizeof(apr_sockaddr_t)); + local_addr->pool = conn->scpool; + rv = apr_socket_bind(newsock, local_addr); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, s, APLOGNO(00956) + "%s: failed to bind socket to local address", + proxy_function); + } + } + + /* make the connection out of the socket */ + rv = apr_socket_connect(newsock, backend_addr); + + /* if an error occurred, loop round and try again */ + if (rv != APR_SUCCESS) { + apr_socket_close(newsock); + loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR; + ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00957) + "%s: attempt to connect to %pI (%s:%d) failed", + proxy_function, + backend_addr, + worker->s->hostname_ex, + (int)worker->s->port); + backend_addr = backend_addr->next; + continue; + } + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02824) + "%s: connection established with %pI (%s:%d)", + proxy_function, + backend_addr, + worker->s->hostname_ex, + (int)worker->s->port); + } + + /* Set a timeout on the socket */ + if (worker->s->timeout_set) { + apr_socket_timeout_set(newsock, worker->s->timeout); + } + else if (conf->timeout_set) { + apr_socket_timeout_set(newsock, conf->timeout); + } + else { + apr_socket_timeout_set(newsock, s->timeout); + } + + conn->sock = newsock; + + if (!conn->uds_path && conn->forward) { + forward_info *forward = (forward_info *)conn->forward; + /* + * For HTTP CONNECT we need to prepend CONNECT request before + * sending our actual HTTPS requests. + */ + if (forward->use_http_connect) { + rv = send_http_connect(conn, s); + /* If an error occurred, loop round and try again */ + if (rv != APR_SUCCESS) { + conn->sock = NULL; + apr_socket_close(newsock); + loglevel = backend_addr->next ? APLOG_DEBUG : APLOG_ERR; + ap_log_error(APLOG_MARK, loglevel, rv, s, APLOGNO(00958) + "%s: attempt to connect to %s:%d " + "via http CONNECT through %pI (%s:%d) failed", + proxy_function, + forward->target_host, forward->target_port, + backend_addr, worker->s->hostname_ex, + (int)worker->s->port); + backend_addr = backend_addr->next; + continue; + } + } + } + } + + if (PROXY_WORKER_IS_USABLE(worker)) { + /* + * Put the entire worker to error state if + * the PROXY_WORKER_IGNORE_ERRORS flag is not set. + * Although some connections may be alive + * no further connections to the worker could be made + */ + if (rv != APR_SUCCESS) { + if (!(worker->s->status & PROXY_WORKER_IGNORE_ERRORS)) { + worker->s->error_time = apr_time_now(); + worker->s->status |= PROXY_WORKER_IN_ERROR; + ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00959) + "ap_proxy_connect_backend disabling worker for (%s:%d) for %" + APR_TIME_T_FMT "s", + worker->s->hostname_ex, (int)worker->s->port, + apr_time_sec(worker->s->retry)); + } + } + else { + if (worker->s->retries) { + /* + * A worker came back. So here is where we need to + * either reset all params to initial conditions or + * apply some sort of aging + */ + } + worker->s->error_time = 0; + worker->s->retries = 0; + } + } + else { + /* + * The worker is in error likely done by a different thread / process + * e.g. for a timeout or bad status. We should respect this and should + * not continue with a connection via this worker even if we got one. + */ + if (rv == APR_SUCCESS) { + socket_cleanup(conn); + } + rv = APR_EINVAL; + } + + return rv == APR_SUCCESS ? OK : DECLINED; +} + +static apr_status_t connection_shutdown(void *theconn) +{ + proxy_conn_rec *conn = (proxy_conn_rec *)theconn; + conn_rec *c = conn->connection; + if (c) { + if (!c->aborted) { + apr_interval_time_t saved_timeout = 0; + apr_socket_timeout_get(conn->sock, &saved_timeout); + if (saved_timeout) { + apr_socket_timeout_set(conn->sock, 0); + } + + (void)ap_shutdown_conn(c, 0); + c->aborted = 1; + + if (saved_timeout) { + apr_socket_timeout_set(conn->sock, saved_timeout); + } + } + + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(02642) + "proxy: connection shutdown"); + } + return APR_SUCCESS; +} + + +static int proxy_connection_create(const char *proxy_function, + proxy_conn_rec *conn, + request_rec *r, server_rec *s) +{ + ap_conf_vector_t *per_dir_config = (r) ? r->per_dir_config + : conn->worker->section_config; + apr_sockaddr_t *backend_addr = conn->addr; + int rc; + apr_interval_time_t current_timeout; + apr_bucket_alloc_t *bucket_alloc; + + if (conn->connection) { + if (conn->is_ssl) { + /* on reuse, reinit the SSL connection dir config with the current + * r->per_dir_config, the previous one was reset on release. + */ + ap_proxy_ssl_engine(conn->connection, per_dir_config, 1); + } + return OK; + } + + bucket_alloc = apr_bucket_alloc_create(conn->scpool); + conn->tmp_bb = apr_brigade_create(conn->scpool, bucket_alloc); + /* + * The socket is now open, create a new backend server connection + */ + conn->connection = ap_run_create_connection(conn->scpool, s, conn->sock, + 0, NULL, + bucket_alloc); + + if (!conn->connection) { + /* + * the peer reset the connection already; ap_run_create_connection() + * closed the socket + */ + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, + s, APLOGNO(00960) "%s: an error occurred creating a " + "new connection to %pI (%s)", proxy_function, + backend_addr, conn->hostname); + /* XXX: Will be closed when proxy_conn is closed */ + socket_cleanup(conn); + return HTTP_INTERNAL_SERVER_ERROR; + } + + /* For ssl connection to backend */ + if (conn->is_ssl) { + if (!ap_proxy_ssl_engine(conn->connection, per_dir_config, 1)) { + ap_log_error(APLOG_MARK, APLOG_ERR, 0, + s, APLOGNO(00961) "%s: failed to enable ssl support " + "for %pI (%s)", proxy_function, + backend_addr, conn->hostname); + return HTTP_INTERNAL_SERVER_ERROR; + } + if (conn->ssl_hostname) { + /* Set a note on the connection about what CN is requested, + * such that mod_ssl can check if it is requested to do so. + */ + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, conn->connection, + "%s: set SNI to %s for (%s)", proxy_function, + conn->ssl_hostname, conn->hostname); + apr_table_setn(conn->connection->notes, "proxy-request-hostname", + conn->ssl_hostname); + } + } + else { + /* TODO: See if this will break FTP */ + ap_proxy_ssl_engine(conn->connection, per_dir_config, 0); + } + + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00962) + "%s: connection complete to %pI (%s)", + proxy_function, backend_addr, conn->hostname); + + /* + * save the timeout of the socket because core_pre_connection + * will set it to base_server->timeout + * (core TimeOut directive). + */ + apr_socket_timeout_get(conn->sock, ¤t_timeout); + /* set up the connection filters */ + rc = ap_run_pre_connection(conn->connection, conn->sock); + if (rc != OK && rc != DONE) { + conn->connection->aborted = 1; + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(00963) + "%s: pre_connection setup failed (%d)", + proxy_function, rc); + return rc; + } + apr_socket_timeout_set(conn->sock, current_timeout); + + /* Shutdown the connection before closing it (eg. SSL connections + * need to be close-notify-ed). + */ + apr_pool_pre_cleanup_register(conn->scpool, conn, connection_shutdown); + + return OK; +} + +PROXY_DECLARE(int) ap_proxy_connection_create_ex(const char *proxy_function, + proxy_conn_rec *conn, + request_rec *r) +{ + return proxy_connection_create(proxy_function, conn, r, r->server); +} + +PROXY_DECLARE(int) ap_proxy_connection_create(const char *proxy_function, + proxy_conn_rec *conn, + conn_rec *c, server_rec *s) +{ + (void) c; /* unused */ + return proxy_connection_create(proxy_function, conn, NULL, s); +} + +int ap_proxy_lb_workers(void) +{ + /* + * Since we can't resize the scoreboard when reconfiguring, we + * have to impose a limit on the number of workers, we are + * able to reconfigure to. + */ + if (!lb_workers_limit) + lb_workers_limit = proxy_lb_workers + PROXY_DYNAMIC_BALANCER_LIMIT; + return lb_workers_limit; +} + +static APR_INLINE int error_code_overridden(const int *elts, int nelts, + int code) +{ + int min = 0; + int max = nelts - 1; + AP_DEBUG_ASSERT(max >= 0); + + while (min < max) { + int mid = (min + max) / 2; + int val = elts[mid]; + + if (val < code) { + min = mid + 1; + } + else if (val > code) { + max = mid - 1; + } + else { + return 1; + } + } + + return elts[min] == code; +} + +PROXY_DECLARE(int) ap_proxy_should_override(proxy_dir_conf *conf, int code) +{ + if (!conf->error_override) + return 0; + + if (apr_is_empty_array(conf->error_override_codes)) + return ap_is_HTTP_ERROR(code); + + /* Since error_override_codes is sorted, apply binary search. */ + return error_code_overridden((int *)conf->error_override_codes->elts, + conf->error_override_codes->nelts, + code); +} + +PROXY_DECLARE(void) ap_proxy_backend_broke(request_rec *r, + apr_bucket_brigade *brigade) +{ + apr_bucket *e; + conn_rec *c = r->connection; + + r->no_cache = 1; + /* + * If this is a subrequest, then prevent also caching of the main + * request. + */ + if (r->main) + r->main->no_cache = 1; + e = ap_bucket_error_create(HTTP_BAD_GATEWAY, NULL, c->pool, + c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(brigade, e); + e = apr_bucket_eos_create(c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(brigade, e); +} + +/* + * Provide a string hashing function for the proxy. + * We offer 2 methods: one is the APR model but we + * also provide our own, based on either FNV or SDBM. + * The reason is in case we want to use both to ensure no + * collisions. + */ +PROXY_DECLARE(unsigned int) +ap_proxy_hashfunc(const char *str, proxy_hash_t method) +{ + if (method == PROXY_HASHFUNC_APR) { + apr_ssize_t slen = strlen(str); + return apr_hashfunc_default(str, &slen); + } + else if (method == PROXY_HASHFUNC_FNV) { + /* FNV model */ + unsigned int hash; + const unsigned int fnv_prime = 0x811C9DC5; + for (hash = 0; *str; str++) { + hash *= fnv_prime; + hash ^= (*str); + } + return hash; + } + else { /* method == PROXY_HASHFUNC_DEFAULT */ + /* SDBM model */ + unsigned int hash; + for (hash = 0; *str; str++) { + hash = (*str) + (hash << 6) + (hash << 16) - hash; + } + return hash; + } +} + +PROXY_DECLARE(apr_status_t) ap_proxy_set_wstatus(char c, int set, proxy_worker *w) +{ + unsigned int *status = &w->s->status; + char flag = toupper(c); + proxy_wstat_t *pwt = proxy_wstat_tbl; + while (pwt->bit) { + if (flag == pwt->flag) { + if (set) + *status |= pwt->bit; + else + *status &= ~(pwt->bit); + return APR_SUCCESS; + } + pwt++; + } + return APR_EINVAL; +} + +PROXY_DECLARE(char *) ap_proxy_parse_wstatus(apr_pool_t *p, proxy_worker *w) +{ + char *ret = ""; + unsigned int status = w->s->status; + proxy_wstat_t *pwt = proxy_wstat_tbl; + while (pwt->bit) { + if (status & pwt->bit) + ret = apr_pstrcat(p, ret, pwt->name, NULL); + pwt++; + } + if (!*ret) { + ret = "??? "; + } + if (PROXY_WORKER_IS_USABLE(w)) + ret = apr_pstrcat(p, ret, "Ok ", NULL); + return ret; +} + +PROXY_DECLARE(apr_status_t) ap_proxy_sync_balancer(proxy_balancer *b, server_rec *s, + proxy_server_conf *conf) +{ + proxy_worker **workers; + int i; + int index; + proxy_worker_shared *shm; + proxy_balancer_method *lbmethod; + ap_slotmem_provider_t *storage = b->storage; + + if (b->s->wupdated <= b->wupdated) + return APR_SUCCESS; + /* balancer sync */ + lbmethod = ap_lookup_provider(PROXY_LBMETHOD, b->s->lbpname, "0"); + if (lbmethod) { + b->lbmethod = lbmethod; + } else { + ap_log_error(APLOG_MARK, APLOG_CRIT, 0, s, APLOGNO(02433) + "Cannot find LB Method: %s", b->s->lbpname); + return APR_EINVAL; + } + + /* worker sync */ + + /* + * Look thru the list of workers in shm + * and see which one(s) we are lacking... + * again, the cast to unsigned int is safe + * since our upper limit is always max_workers + * which is int. + */ + for (index = 0; index < b->max_workers; index++) { + int found; + apr_status_t rv; + if ((rv = storage->dptr(b->wslot, (unsigned int)index, (void *)&shm)) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00965) "worker slotmem_dptr failed"); + return APR_EGENERAL; + } + /* account for possible "holes" in the slotmem + * (eg: slots 0-2 are used, but 3 isn't, but 4-5 is) + */ + if (!shm->hash.def || !shm->hash.fnv) + continue; + found = 0; + workers = (proxy_worker **)b->workers->elts; + for (i = 0; i < b->workers->nelts; i++, workers++) { + proxy_worker *worker = *workers; + if (worker->hash.def == shm->hash.def && worker->hash.fnv == shm->hash.fnv) { + found = 1; + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02402) + "re-grabbing shm[%d] (0x%pp) for worker: %s", i, (void *)shm, + ap_proxy_worker_name(conf->pool, worker)); + break; + } + } + if (!found) { + proxy_worker **runtime; + /* XXX: a thread mutex is maybe enough here */ + apr_global_mutex_lock(proxy_mutex); + runtime = apr_array_push(b->workers); + *runtime = apr_pcalloc(conf->pool, sizeof(proxy_worker)); + apr_global_mutex_unlock(proxy_mutex); + (*runtime)->hash = shm->hash; + (*runtime)->balancer = b; + (*runtime)->s = shm; + + rv = ap_proxy_initialize_worker(*runtime, s, conf->pool); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(00966) "Cannot init worker"); + return rv; + } + ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(02403) + "grabbing shm[%d] (0x%pp) for worker: %s", i, (void *)shm, + (*runtime)->s->name_ex); + } + } + if (b->s->need_reset) { + if (b->lbmethod && b->lbmethod->reset) + b->lbmethod->reset(b, s); + b->s->need_reset = 0; + } + b->wupdated = b->s->wupdated; + return APR_SUCCESS; +} + +PROXY_DECLARE(proxy_worker_shared *) ap_proxy_find_workershm(ap_slotmem_provider_t *storage, + ap_slotmem_instance_t *slot, + proxy_worker *worker, + unsigned int *index) +{ + proxy_worker_shared *shm; + unsigned int i, limit; + limit = storage->num_slots(slot); + for (i = 0; i < limit; i++) { + if (storage->dptr(slot, i, (void *)&shm) != APR_SUCCESS) { + return NULL; + } + if ((worker->s->hash.def == shm->hash.def) && + (worker->s->hash.fnv == shm->hash.fnv)) { + *index = i; + return shm; + } + } + return NULL; +} + +PROXY_DECLARE(proxy_balancer_shared *) ap_proxy_find_balancershm(ap_slotmem_provider_t *storage, + ap_slotmem_instance_t *slot, + proxy_balancer *balancer, + unsigned int *index) +{ + proxy_balancer_shared *shm; + unsigned int i, limit; + limit = storage->num_slots(slot); + for (i = 0; i < limit; i++) { + if (storage->dptr(slot, i, (void *)&shm) != APR_SUCCESS) { + return NULL; + } + if ((balancer->s->hash.def == shm->hash.def) && + (balancer->s->hash.fnv == shm->hash.fnv)) { + *index = i; + return shm; + } + } + return NULL; +} + +typedef struct header_connection { + apr_pool_t *pool; + apr_array_header_t *array; + const char *first; + unsigned int closed:1; +} header_connection; + +static int find_conn_headers(void *data, const char *key, const char *val) +{ + header_connection *x = data; + const char *name; + + do { + while (*val == ',' || *val == ';') { + val++; + } + name = ap_get_token(x->pool, &val, 0); + if (!strcasecmp(name, "close")) { + x->closed = 1; + } + if (!x->first) { + x->first = name; + } + else { + const char **elt; + if (!x->array) { + x->array = apr_array_make(x->pool, 4, sizeof(char *)); + } + elt = apr_array_push(x->array); + *elt = name; + } + } while (*val); + + return 1; +} + +/** + * Remove all headers referred to by the Connection header. + */ +static int ap_proxy_clear_connection(request_rec *r, apr_table_t *headers) +{ + const char **name; + header_connection x; + + x.pool = r->pool; + x.array = NULL; + x.first = NULL; + x.closed = 0; + + apr_table_unset(headers, "Proxy-Connection"); + + apr_table_do(find_conn_headers, &x, headers, "Connection", NULL); + if (x.first) { + /* fast path - no memory allocated for one header */ + apr_table_unset(headers, "Connection"); + apr_table_unset(headers, x.first); + } + if (x.array) { + /* two or more headers */ + while ((name = apr_array_pop(x.array))) { + apr_table_unset(headers, *name); + } + } + + return x.closed; +} + +PROXY_DECLARE(int) ap_proxy_create_hdrbrgd(apr_pool_t *p, + apr_bucket_brigade *header_brigade, + request_rec *r, + proxy_conn_rec *p_conn, + proxy_worker *worker, + proxy_server_conf *conf, + apr_uri_t *uri, + char *url, char *server_portstr, + char **old_cl_val, + char **old_te_val) +{ + int rc = OK; + conn_rec *c = r->connection; + int counter; + char *buf; + apr_table_t *saved_headers_in = r->headers_in; + const char *saved_host = apr_table_get(saved_headers_in, "Host"); + const apr_array_header_t *headers_in_array; + const apr_table_entry_t *headers_in; + apr_bucket *e; + int force10 = 0, do_100_continue = 0; + conn_rec *origin = p_conn->connection; + const char *host, *val; + proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config, &proxy_module); + + /* + * HTTP "Ping" test? Easiest is 100-Continue. However: + * To be compliant, we only use 100-Continue for requests with bodies. + * We also make sure we won't be talking HTTP/1.0 as well. + */ + if (apr_table_get(r->subprocess_env, "force-proxy-request-1.0")) { + force10 = 1; + } + else if (apr_table_get(r->notes, "proxy-100-continue") + || PROXY_SHOULD_PING_100_CONTINUE(worker, r)) { + do_100_continue = 1; + } + if (force10 || apr_table_get(r->subprocess_env, "proxy-nokeepalive")) { + if (origin) { + origin->keepalive = AP_CONN_CLOSE; + } + p_conn->close = 1; + } + + if (force10) { + buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.0" CRLF, NULL); + } + else { + buf = apr_pstrcat(p, r->method, " ", url, " HTTP/1.1" CRLF, NULL); + } + ap_xlate_proto_to_ascii(buf, strlen(buf)); + e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(header_brigade, e); + + /* + * Make a copy on r->headers_in for the request we make to the backend, + * modify the copy in place according to our configuration and connection + * handling, use it to fill in the forwarded headers' brigade, and finally + * restore the saved/original ones in r->headers_in. + * + * Note: We need to take r->pool for apr_table_copy as the key / value + * pairs in r->headers_in have been created out of r->pool and + * p might be (and actually is) a longer living pool. + * This would trigger the bad pool ancestry abort in apr_table_copy if + * apr is compiled with APR_POOL_DEBUG. + * + * icing: if p indeed lives longer than r->pool, we should allocate + * all new header values from r->pool as well and avoid leakage. + */ + r->headers_in = apr_table_copy(r->pool, saved_headers_in); + + /* Return the original Transfer-Encoding and/or Content-Length values + * then drop the headers, they must be set by the proxy handler based + * on the actual body being forwarded. + */ + if ((*old_te_val = (char *)apr_table_get(r->headers_in, + "Transfer-Encoding"))) { + apr_table_unset(r->headers_in, "Transfer-Encoding"); + } + if ((*old_cl_val = (char *)apr_table_get(r->headers_in, + "Content-Length"))) { + apr_table_unset(r->headers_in, "Content-Length"); + } + + /* Clear out hop-by-hop request headers not to forward */ + if (ap_proxy_clear_connection(r, r->headers_in) < 0) { + rc = HTTP_BAD_REQUEST; + goto cleanup; + } + + /* RFC2616 13.5.1 says we should strip these */ + apr_table_unset(r->headers_in, "Keep-Alive"); + apr_table_unset(r->headers_in, "Upgrade"); + apr_table_unset(r->headers_in, "Trailer"); + apr_table_unset(r->headers_in, "TE"); + + /* Compute Host header */ + if (dconf->preserve_host == 0) { + if (ap_strchr_c(uri->hostname, ':')) { /* if literal IPv6 address */ + if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) { + host = apr_pstrcat(r->pool, "[", uri->hostname, "]:", + uri->port_str, NULL); + } else { + host = apr_pstrcat(r->pool, "[", uri->hostname, "]", NULL); + } + } else { + if (uri->port_str && uri->port != DEFAULT_HTTP_PORT) { + host = apr_pstrcat(r->pool, uri->hostname, ":", + uri->port_str, NULL); + } else { + host = uri->hostname; + } + } + apr_table_setn(r->headers_in, "Host", host); + } + else { + /* don't want to use r->hostname as the incoming header might have a + * port attached, let's use the original header. + */ + host = saved_host; + if (!host) { + host = r->server->server_hostname; + ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r, APLOGNO(01092) + "no HTTP 0.9 request (with no host line) " + "on incoming request and preserve host set " + "forcing hostname to be %s for uri %s", + host, r->uri); + apr_table_setn(r->headers_in, "Host", host); + } + } + + /* handle Via */ + if (conf->viaopt == via_block) { + /* Block all outgoing Via: headers */ + apr_table_unset(r->headers_in, "Via"); + } else if (conf->viaopt != via_off) { + const char *server_name = ap_get_server_name(r); + /* If USE_CANONICAL_NAME_OFF was configured for the proxy virtual host, + * then the server name returned by ap_get_server_name() is the + * origin server name (which does make too much sense with Via: headers) + * so we use the proxy vhost's name instead. + */ + if (server_name == r->hostname) + server_name = r->server->server_hostname; + /* Create a "Via:" request header entry and merge it */ + /* Generate outgoing Via: header with/without server comment: */ + apr_table_mergen(r->headers_in, "Via", + (conf->viaopt == via_full) + ? apr_psprintf(p, "%d.%d %s%s (%s)", + HTTP_VERSION_MAJOR(r->proto_num), + HTTP_VERSION_MINOR(r->proto_num), + server_name, server_portstr, + AP_SERVER_BASEVERSION) + : apr_psprintf(p, "%d.%d %s%s", + HTTP_VERSION_MAJOR(r->proto_num), + HTTP_VERSION_MINOR(r->proto_num), + server_name, server_portstr) + ); + } + + /* Use HTTP/1.1 100-Continue as quick "HTTP ping" test + * to backend + */ + if (do_100_continue) { + /* Add the Expect header if not already there. */ + if (!(val = apr_table_get(r->headers_in, "Expect")) + || (ap_cstr_casecmp(val, "100-Continue") != 0 /* fast path */ + && !ap_find_token(r->pool, val, "100-Continue"))) { + apr_table_mergen(r->headers_in, "Expect", "100-Continue"); + } + } + else { + /* XXX: we should strip the 100-continue token only from the + * Expect header, but are there others actually used anywhere? + */ + apr_table_unset(r->headers_in, "Expect"); + } + + /* X-Forwarded-*: handling + * + * XXX Privacy Note: + * ----------------- + * + * These request headers are only really useful when the mod_proxy + * is used in a reverse proxy configuration, so that useful info + * about the client can be passed through the reverse proxy and on + * to the backend server, which may require the information to + * function properly. + * + * In a forward proxy situation, these options are a potential + * privacy violation, as information about clients behind the proxy + * are revealed to arbitrary servers out there on the internet. + * + * The HTTP/1.1 Via: header is designed for passing client + * information through proxies to a server, and should be used in + * a forward proxy configuration instead of X-Forwarded-*. See the + * ProxyVia option for details. + */ + if (dconf->add_forwarded_headers) { + if (PROXYREQ_REVERSE == r->proxyreq) { + /* Add X-Forwarded-For: so that the upstream has a chance to + * determine, where the original request came from. + */ + apr_table_mergen(r->headers_in, "X-Forwarded-For", + r->useragent_ip); + + /* Add X-Forwarded-Host: so that upstream knows what the + * original request hostname was. + */ + if (saved_host) { + apr_table_mergen(r->headers_in, "X-Forwarded-Host", + saved_host); + } + + /* Add X-Forwarded-Server: so that upstream knows what the + * name of this proxy server is (if there are more than one) + * XXX: This duplicates Via: - do we strictly need it? + */ + apr_table_mergen(r->headers_in, "X-Forwarded-Server", + r->server->server_hostname); + } + } + + /* Do we want to strip Proxy-Authorization ? + * If we haven't used it, then NO + * If we have used it then MAYBE: RFC2616 says we MAY propagate it. + * So let's make it configurable by env. + */ + if (r->user != NULL /* we've authenticated */ + && !apr_table_get(r->subprocess_env, "Proxy-Chain-Auth")) { + apr_table_unset(r->headers_in, "Proxy-Authorization"); + } + + /* for sub-requests, ignore freshness/expiry headers */ + if (r->main) { + apr_table_unset(r->headers_in, "If-Match"); + apr_table_unset(r->headers_in, "If-Modified-Since"); + apr_table_unset(r->headers_in, "If-Range"); + apr_table_unset(r->headers_in, "If-Unmodified-Since"); + apr_table_unset(r->headers_in, "If-None-Match"); + } + + /* run hook to fixup the request we are about to send */ + proxy_run_fixups(r); + + /* We used to send `Host: ` always first, so let's keep it that + * way. No telling which legacy backend is relying on this. + * If proxy_run_fixups() changed the value, use it (though removal + * is ignored). + */ + val = apr_table_get(r->headers_in, "Host"); + if (val) { + apr_table_unset(r->headers_in, "Host"); + host = val; + } + buf = apr_pstrcat(p, "Host: ", host, CRLF, NULL); + ap_xlate_proto_to_ascii(buf, strlen(buf)); + e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(header_brigade, e); + + /* Append the (remaining) headers to the brigade */ + headers_in_array = apr_table_elts(r->headers_in); + headers_in = (const apr_table_entry_t *) headers_in_array->elts; + for (counter = 0; counter < headers_in_array->nelts; counter++) { + if (headers_in[counter].key == NULL + || headers_in[counter].val == NULL) { + continue; + } + + buf = apr_pstrcat(p, headers_in[counter].key, ": ", + headers_in[counter].val, CRLF, + NULL); + ap_xlate_proto_to_ascii(buf, strlen(buf)); + e = apr_bucket_pool_create(buf, strlen(buf), p, c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(header_brigade, e); + } + +cleanup: + r->headers_in = saved_headers_in; + return rc; +} + +PROXY_DECLARE(int) ap_proxy_prefetch_input(request_rec *r, + proxy_conn_rec *backend, + apr_bucket_brigade *input_brigade, + apr_read_type_e block, + apr_off_t *bytes_read, + apr_off_t max_read) +{ + apr_pool_t *p = r->pool; + conn_rec *c = r->connection; + apr_bucket_brigade *temp_brigade; + apr_status_t status; + apr_off_t bytes; + + *bytes_read = 0; + if (max_read < APR_BUCKET_BUFF_SIZE) { + max_read = APR_BUCKET_BUFF_SIZE; + } + + /* Prefetch max_read bytes + * + * This helps us avoid any election of C-L v.s. T-E + * request bodies, since we are willing to keep in + * memory this much data, in any case. This gives + * us an instant C-L election if the body is of some + * reasonable size. + */ + temp_brigade = apr_brigade_create(p, input_brigade->bucket_alloc); + + /* Account for saved input, if any. */ + apr_brigade_length(input_brigade, 0, bytes_read); + + /* Ensure we don't hit a wall where we have a buffer too small for + * ap_get_brigade's filters to fetch us another bucket, surrender + * once we hit 80 bytes (an arbitrary value) less than max_read. + */ + while (*bytes_read < max_read - 80 + && (APR_BRIGADE_EMPTY(input_brigade) + || !APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade)))) { + status = ap_get_brigade(r->input_filters, temp_brigade, + AP_MODE_READBYTES, block, + max_read - *bytes_read); + /* ap_get_brigade may return success with an empty brigade + * for a non-blocking read which would block + */ + if (block == APR_NONBLOCK_READ + && ((status == APR_SUCCESS && APR_BRIGADE_EMPTY(temp_brigade)) + || APR_STATUS_IS_EAGAIN(status))) { + break; + } + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01095) + "prefetch request body failed to %pI (%s)" + " from %s (%s)", backend->addr, + backend->hostname ? backend->hostname : "", + c->client_ip, c->remote_host ? c->remote_host : ""); + return ap_map_http_request_error(status, HTTP_BAD_REQUEST); + } + + apr_brigade_length(temp_brigade, 1, &bytes); + *bytes_read += bytes; + + /* + * Save temp_brigade in input_brigade. (At least) in the SSL case + * temp_brigade contains transient buckets whose data would get + * overwritten during the next call of ap_get_brigade in the loop. + * ap_save_brigade ensures these buckets to be set aside. + * Calling ap_save_brigade with NULL as filter is OK, because + * input_brigade already has been created and does not need to get + * created by ap_save_brigade. + */ + status = ap_save_brigade(NULL, &input_brigade, &temp_brigade, p); + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01096) + "processing prefetched request body failed" + " to %pI (%s) from %s (%s)", backend->addr, + backend->hostname ? backend->hostname : "", + c->client_ip, c->remote_host ? c->remote_host : ""); + return HTTP_INTERNAL_SERVER_ERROR; + } + } + + return OK; +} + +PROXY_DECLARE(int) ap_proxy_read_input(request_rec *r, + proxy_conn_rec *backend, + apr_bucket_brigade *bb, + apr_off_t max_read) +{ + apr_bucket_alloc_t *bucket_alloc = bb->bucket_alloc; + apr_read_type_e block = (backend->connection) ? APR_NONBLOCK_READ + : APR_BLOCK_READ; + apr_status_t status; + int rv; + + for (;;) { + apr_brigade_cleanup(bb); + status = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES, + block, max_read); + if (block == APR_BLOCK_READ + || (!(status == APR_SUCCESS && APR_BRIGADE_EMPTY(bb)) + && !APR_STATUS_IS_EAGAIN(status))) { + break; + } + + /* Flush and retry (blocking) */ + apr_brigade_cleanup(bb); + rv = ap_proxy_pass_brigade(bucket_alloc, r, backend, + backend->connection, bb, 1); + if (rv != OK) { + return rv; + } + block = APR_BLOCK_READ; + } + + if (status != APR_SUCCESS) { + conn_rec *c = r->connection; + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(02608) + "read request body failed to %pI (%s)" + " from %s (%s)", backend->addr, + backend->hostname ? backend->hostname : "", + c->client_ip, c->remote_host ? c->remote_host : ""); + return ap_map_http_request_error(status, HTTP_BAD_REQUEST); + } + + return OK; +} + +PROXY_DECLARE(int) ap_proxy_spool_input(request_rec *r, + proxy_conn_rec *backend, + apr_bucket_brigade *input_brigade, + apr_off_t *bytes_spooled, + apr_off_t max_mem_spool) +{ + apr_pool_t *p = r->pool; + int seen_eos = 0, rv = OK; + apr_status_t status = APR_SUCCESS; + apr_bucket_alloc_t *bucket_alloc = input_brigade->bucket_alloc; + apr_bucket_brigade *body_brigade; + apr_bucket *e; + apr_off_t bytes, fsize = 0; + apr_file_t *tmpfile = NULL; + + *bytes_spooled = 0; + body_brigade = apr_brigade_create(p, bucket_alloc); + + do { + if (APR_BRIGADE_EMPTY(input_brigade)) { + rv = ap_proxy_read_input(r, backend, input_brigade, + HUGE_STRING_LEN); + if (rv != OK) { + return rv; + } + } + + /* If this brigade contains EOS, either stop or remove it. */ + if (APR_BUCKET_IS_EOS(APR_BRIGADE_LAST(input_brigade))) { + seen_eos = 1; + } + + apr_brigade_length(input_brigade, 1, &bytes); + + if (*bytes_spooled + bytes > max_mem_spool) { + /* can't spool any more in memory; write latest brigade to disk */ + if (tmpfile == NULL) { + const char *temp_dir; + char *template; + + status = apr_temp_dir_get(&temp_dir, p); + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01089) + "search for temporary directory failed"); + return HTTP_INTERNAL_SERVER_ERROR; + } + apr_filepath_merge(&template, temp_dir, + "modproxy.tmp.XXXXXX", + APR_FILEPATH_NATIVE, p); + status = apr_file_mktemp(&tmpfile, template, 0, p); + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01090) + "creation of temporary file in directory " + "%s failed", temp_dir); + return HTTP_INTERNAL_SERVER_ERROR; + } + } + for (e = APR_BRIGADE_FIRST(input_brigade); + e != APR_BRIGADE_SENTINEL(input_brigade); + e = APR_BUCKET_NEXT(e)) { + const char *data; + apr_size_t bytes_read, bytes_written; + + apr_bucket_read(e, &data, &bytes_read, APR_BLOCK_READ); + status = apr_file_write_full(tmpfile, data, bytes_read, &bytes_written); + if (status != APR_SUCCESS) { + const char *tmpfile_name; + + if (apr_file_name_get(&tmpfile_name, tmpfile) != APR_SUCCESS) { + tmpfile_name = "(unknown)"; + } + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01091) + "write to temporary file %s failed", + tmpfile_name); + return HTTP_INTERNAL_SERVER_ERROR; + } + AP_DEBUG_ASSERT(bytes_read == bytes_written); + fsize += bytes_written; + } + apr_brigade_cleanup(input_brigade); + } + else { + + /* + * Save input_brigade in body_brigade. (At least) in the SSL case + * input_brigade contains transient buckets whose data would get + * overwritten during the next call of ap_get_brigade in the loop. + * ap_save_brigade ensures these buckets to be set aside. + * Calling ap_save_brigade with NULL as filter is OK, because + * body_brigade already has been created and does not need to get + * created by ap_save_brigade. + */ + status = ap_save_brigade(NULL, &body_brigade, &input_brigade, p); + if (status != APR_SUCCESS) { + return HTTP_INTERNAL_SERVER_ERROR; + } + + } + + *bytes_spooled += bytes; + } while (!seen_eos); + + APR_BRIGADE_CONCAT(input_brigade, body_brigade); + if (tmpfile) { + apr_brigade_insert_file(input_brigade, tmpfile, 0, fsize, p); + } + if (apr_table_get(r->subprocess_env, "proxy-sendextracrlf")) { + e = apr_bucket_immortal_create(CRLF_ASCII, 2, bucket_alloc); + APR_BRIGADE_INSERT_TAIL(input_brigade, e); + } + if (tmpfile) { + /* We dropped metadata buckets when spooling to tmpfile, + * terminate with EOS to allow for flushing in a one go. + */ + e = apr_bucket_eos_create(bucket_alloc); + APR_BRIGADE_INSERT_TAIL(input_brigade, e); + } + return OK; +} + +PROXY_DECLARE(int) ap_proxy_pass_brigade(apr_bucket_alloc_t *bucket_alloc, + request_rec *r, proxy_conn_rec *p_conn, + conn_rec *origin, apr_bucket_brigade *bb, + int flush) +{ + apr_status_t status; + apr_off_t transferred; + + if (flush) { + apr_bucket *e = apr_bucket_flush_create(bucket_alloc); + APR_BRIGADE_INSERT_TAIL(bb, e); + } + apr_brigade_length(bb, 0, &transferred); + if (transferred != -1) + p_conn->worker->s->transferred += transferred; + status = ap_pass_brigade(origin->output_filters, bb); + /* Cleanup the brigade now to avoid buckets lifetime + * issues in case of error returned below. */ + apr_brigade_cleanup(bb); + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, r, APLOGNO(01084) + "pass request body failed to %pI (%s)", + p_conn->addr, p_conn->hostname); + if (origin->aborted) { + const char *ssl_note; + + if (((ssl_note = apr_table_get(origin->notes, "SSL_connect_rv")) + != NULL) && (strcmp(ssl_note, "err") == 0)) { + return ap_proxyerror(r, HTTP_INTERNAL_SERVER_ERROR, + "Error during SSL Handshake with" + " remote server"); + } + return APR_STATUS_IS_TIMEUP(status) ? HTTP_GATEWAY_TIME_OUT : HTTP_BAD_GATEWAY; + } + else { + return HTTP_BAD_REQUEST; + } + } + return OK; +} + +/* Fill in unknown schemes from apr_uri_port_of_scheme() */ + +typedef struct proxy_schemes_t { + const char *name; + apr_port_t default_port; +} proxy_schemes_t ; + +static proxy_schemes_t pschemes[] = +{ + {"fcgi", 8000}, + {"ajp", AJP13_DEF_PORT}, + {"scgi", SCGI_DEF_PORT}, + {"h2c", DEFAULT_HTTP_PORT}, + {"h2", DEFAULT_HTTPS_PORT}, + {"ws", DEFAULT_HTTP_PORT}, + {"wss", DEFAULT_HTTPS_PORT}, + { NULL, 0xFFFF } /* unknown port */ +}; + +PROXY_DECLARE(apr_port_t) ap_proxy_port_of_scheme(const char *scheme) +{ + if (scheme) { + apr_port_t port; + if ((port = apr_uri_port_of_scheme(scheme)) != 0) { + return port; + } else { + proxy_schemes_t *pscheme; + for (pscheme = pschemes; pscheme->name != NULL; ++pscheme) { + if (ap_cstr_casecmp(scheme, pscheme->name) == 0) { + return pscheme->default_port; + } + } + } + } + return 0; +} + +static APR_INLINE int ap_filter_should_yield(ap_filter_t *f) +{ + return f->c->data_in_output_filters; +} + +static APR_INLINE int ap_filter_output_pending(conn_rec *c) +{ + ap_filter_t *f = c->output_filters; + while (f->next) { + f = f->next; + } + if (f->frec->filter_func.out_func(f, NULL)) { + return AP_FILTER_ERROR; + } + return c->data_in_output_filters ? OK : DECLINED; +} + +PROXY_DECLARE(apr_status_t) ap_proxy_buckets_lifetime_transform(request_rec *r, + apr_bucket_brigade *from, + apr_bucket_brigade *to) +{ + apr_bucket *e; + apr_bucket *new; + const char *data; + apr_size_t bytes; + apr_status_t rv = APR_SUCCESS; + apr_bucket_alloc_t *bucket_alloc = to->bucket_alloc; + + apr_brigade_cleanup(to); + for (e = APR_BRIGADE_FIRST(from); + e != APR_BRIGADE_SENTINEL(from); + e = APR_BUCKET_NEXT(e)) { + if (!APR_BUCKET_IS_METADATA(e)) { + apr_bucket_read(e, &data, &bytes, APR_BLOCK_READ); + new = apr_bucket_transient_create(data, bytes, bucket_alloc); + APR_BRIGADE_INSERT_TAIL(to, new); + } + else if (APR_BUCKET_IS_FLUSH(e)) { + new = apr_bucket_flush_create(bucket_alloc); + APR_BRIGADE_INSERT_TAIL(to, new); + } + else if (APR_BUCKET_IS_EOS(e)) { + new = apr_bucket_eos_create(bucket_alloc); + APR_BRIGADE_INSERT_TAIL(to, new); + } + else { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(03304) + "Unhandled bucket type of type %s in" + " ap_proxy_buckets_lifetime_transform", e->type->name); + rv = APR_EGENERAL; + } + } + return rv; +} + +/* An arbitrary large value to address pathological case where we keep + * reading from one side only, without scheduling the other direction for + * too long. This can happen with large MTU and small read buffers, like + * micro-benchmarking huge files bidirectional transfer with client, proxy + * and backend on localhost for instance. Though we could just ignore the + * case and let the sender stop by itself at some point when/if it needs to + * receive data, or the receiver stop when/if it needs to send... + */ +#define PROXY_TRANSFER_MAX_READS 10000 + +PROXY_DECLARE(apr_status_t) ap_proxy_transfer_between_connections( + request_rec *r, + conn_rec *c_i, + conn_rec *c_o, + apr_bucket_brigade *bb_i, + apr_bucket_brigade *bb_o, + const char *name, + int *sent, + apr_off_t bsize, + int flags) +{ + apr_status_t rv; + int flush_each = 0; + unsigned int num_reads = 0; +#ifdef DEBUGGING + apr_off_t len; +#endif + + /* + * Compat: since FLUSH_EACH is default (and zero) for legacy reasons, we + * pretend it's no FLUSH_AFTER nor YIELD_PENDING flags, the latter because + * flushing would defeat the purpose of checking for pending data (hence + * determine whether or not the output chain/stack is full for stopping). + */ + if (!(flags & (AP_PROXY_TRANSFER_FLUSH_AFTER | + AP_PROXY_TRANSFER_YIELD_PENDING))) { + flush_each = 1; + } + + for (;;) { + apr_brigade_cleanup(bb_i); + rv = ap_get_brigade(c_i->input_filters, bb_i, AP_MODE_READBYTES, + APR_NONBLOCK_READ, bsize); + if (rv != APR_SUCCESS) { + if (!APR_STATUS_IS_EAGAIN(rv) && !APR_STATUS_IS_EOF(rv)) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, APLOGNO(03308) + "ap_proxy_transfer_between_connections: " + "error on %s - ap_get_brigade", + name); + if (rv == APR_INCOMPLETE) { + /* Don't return APR_INCOMPLETE, it'd mean "should yield" + * for the caller, while it means "incomplete body" here + * from ap_http_filter(), which is an error. + */ + rv = APR_EGENERAL; + } + } + break; + } + + if (c_o->aborted) { + apr_brigade_cleanup(bb_i); + flags &= ~AP_PROXY_TRANSFER_FLUSH_AFTER; + rv = APR_EPIPE; + break; + } + if (APR_BRIGADE_EMPTY(bb_i)) { + break; + } +#ifdef DEBUGGING + len = -1; + apr_brigade_length(bb_i, 0, &len); + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03306) + "ap_proxy_transfer_between_connections: " + "read %" APR_OFF_T_FMT + " bytes from %s", len, name); +#endif + if (sent) { + *sent = 1; + } + ap_proxy_buckets_lifetime_transform(r, bb_i, bb_o); + if (flush_each) { + apr_bucket *b; + /* + * Do not use ap_fflush here since this would cause the flush + * bucket to be sent in a separate brigade afterwards which + * causes some filters to set aside the buckets from the first + * brigade and process them when FLUSH arrives in the second + * brigade. As set asides of our transformed buckets involve + * memory copying we try to avoid this. If we have the flush + * bucket in the first brigade they directly process the + * buckets without setting them aside. + */ + b = apr_bucket_flush_create(bb_o->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(bb_o, b); + } + rv = ap_pass_brigade(c_o->output_filters, bb_o); + apr_brigade_cleanup(bb_o); + if (rv != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(03307) + "ap_proxy_transfer_between_connections: " + "error on %s - ap_pass_brigade", + name); + flags &= ~AP_PROXY_TRANSFER_FLUSH_AFTER; + break; + } + + /* Yield if the output filters stack is full? This is to avoid + * blocking and give the caller a chance to POLLOUT async. + */ + if ((flags & AP_PROXY_TRANSFER_YIELD_PENDING) + && ap_filter_should_yield(c_o->output_filters)) { + int rc = ap_filter_output_pending(c_o); + if (rc == OK) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "ap_proxy_transfer_between_connections: " + "yield (output pending)"); + rv = APR_INCOMPLETE; + break; + } + if (rc != DECLINED) { + rv = AP_FILTER_ERROR; + break; + } + } + + /* Yield if we keep hold of the thread for too long? This gives + * the caller a chance to schedule the other direction too. + */ + if ((flags & AP_PROXY_TRANSFER_YIELD_MAX_READS) + && ++num_reads > PROXY_TRANSFER_MAX_READS) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, + "ap_proxy_transfer_between_connections: " + "yield (max reads)"); + rv = APR_SUCCESS; + break; + } + } + + if (flags & AP_PROXY_TRANSFER_FLUSH_AFTER) { + ap_fflush(c_o->output_filters, bb_o); + apr_brigade_cleanup(bb_o); + } + apr_brigade_cleanup(bb_i); + + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, rv, r, + "ap_proxy_transfer_between_connections complete (%s %pI)", + (c_i == r->connection) ? "to" : "from", + (c_i == r->connection) ? c_o->client_addr + : c_i->client_addr); + + if (APR_STATUS_IS_EAGAIN(rv)) { + rv = APR_SUCCESS; + } + return rv; +} + +struct proxy_tunnel_conn { + /* the other side of the tunnel */ + struct proxy_tunnel_conn *other; + + conn_rec *c; + const char *name; + + apr_pollfd_t *pfd; + apr_bucket_brigade *bb; + + unsigned int down_in:1, + down_out:1; +}; + +PROXY_DECLARE(apr_status_t) ap_proxy_tunnel_create(proxy_tunnel_rec **ptunnel, + request_rec *r, conn_rec *c_o, + const char *scheme) +{ + apr_status_t rv; + conn_rec *c_i = r->connection; + apr_interval_time_t timeout = -1; + proxy_tunnel_rec *tunnel; + + *ptunnel = NULL; + + tunnel = apr_pcalloc(r->pool, sizeof(*tunnel)); + + rv = apr_pollset_create(&tunnel->pollset, 2, r->pool, APR_POLLSET_NOCOPY); + if (rv != APR_SUCCESS) { + return rv; + } + + tunnel->r = r; + tunnel->scheme = apr_pstrdup(r->pool, scheme); + tunnel->client = apr_pcalloc(r->pool, sizeof(struct proxy_tunnel_conn)); + tunnel->origin = apr_pcalloc(r->pool, sizeof(struct proxy_tunnel_conn)); + tunnel->pfds = apr_array_make(r->pool, 2, sizeof(apr_pollfd_t)); + tunnel->read_buf_size = ap_get_read_buf_size(r); + tunnel->client->other = tunnel->origin; + tunnel->origin->other = tunnel->client; + tunnel->timeout = -1; + + tunnel->client->c = c_i; + tunnel->client->name = "client"; + tunnel->client->bb = apr_brigade_create(c_i->pool, c_i->bucket_alloc); + tunnel->client->pfd = &APR_ARRAY_PUSH(tunnel->pfds, apr_pollfd_t); + tunnel->client->pfd->p = r->pool; + tunnel->client->pfd->desc_type = APR_POLL_SOCKET; + tunnel->client->pfd->desc.s = ap_get_conn_socket(c_i); + tunnel->client->pfd->client_data = tunnel->client; + + tunnel->origin->c = c_o; + tunnel->origin->name = "origin"; + tunnel->origin->bb = apr_brigade_create(c_o->pool, c_o->bucket_alloc); + tunnel->origin->pfd = &APR_ARRAY_PUSH(tunnel->pfds, apr_pollfd_t); + tunnel->origin->pfd->p = r->pool; + tunnel->origin->pfd->desc_type = APR_POLL_SOCKET; + tunnel->origin->pfd->desc.s = ap_get_conn_socket(c_o); + tunnel->origin->pfd->client_data = tunnel->origin; + + /* Defaults to the biggest timeout of both connections */ + apr_socket_timeout_get(tunnel->client->pfd->desc.s, &timeout); + apr_socket_timeout_get(tunnel->origin->pfd->desc.s, &tunnel->timeout); + if (timeout >= 0 && (tunnel->timeout < 0 || tunnel->timeout < timeout)) { + tunnel->timeout = timeout; + } + + /* We should be nonblocking from now on the sockets */ + apr_socket_opt_set(tunnel->client->pfd->desc.s, APR_SO_NONBLOCK, 1); + apr_socket_opt_set(tunnel->origin->pfd->desc.s, APR_SO_NONBLOCK, 1); + + /* No coalescing filters */ + ap_remove_output_filter_byhandle(c_i->output_filters, + "SSL/TLS Coalescing Filter"); + ap_remove_output_filter_byhandle(c_o->output_filters, + "SSL/TLS Coalescing Filter"); + + /* Bidirectional non-HTTP stream will confuse mod_reqtimeoout */ + ap_remove_input_filter_byhandle(c_i->input_filters, "reqtimeout"); + + /* The input/output filter stacks should contain connection filters only */ + r->input_filters = r->proto_input_filters = c_i->input_filters; + r->output_filters = r->proto_output_filters = c_i->output_filters; + + /* Won't be reused after tunneling */ + c_i->keepalive = AP_CONN_CLOSE; + c_o->keepalive = AP_CONN_CLOSE; + + /* Disable half-close forwarding for this request? */ + if (apr_table_get(r->subprocess_env, "proxy-nohalfclose")) { + tunnel->nohalfclose = 1; + } + + /* Start with POLLOUT and let ap_proxy_tunnel_run() schedule both + * directions when there are no output data pending (anymore). + */ + tunnel->client->pfd->reqevents = APR_POLLOUT | APR_POLLERR; + tunnel->origin->pfd->reqevents = APR_POLLOUT | APR_POLLERR; + if ((rv = apr_pollset_add(tunnel->pollset, tunnel->client->pfd)) + || (rv = apr_pollset_add(tunnel->pollset, tunnel->origin->pfd))) { + return rv; + } + + *ptunnel = tunnel; + return APR_SUCCESS; +} + +static void add_pollset(apr_pollset_t *pollset, apr_pollfd_t *pfd, + apr_int16_t events) +{ + apr_status_t rv; + + AP_DEBUG_ASSERT((pfd->reqevents & events) == 0); + + if (pfd->reqevents) { + rv = apr_pollset_remove(pollset, pfd); + if (rv != APR_SUCCESS) { + AP_DEBUG_ASSERT(1); + } + } + + if (events & APR_POLLIN) { + events |= APR_POLLHUP; + } + pfd->reqevents |= events | APR_POLLERR; + rv = apr_pollset_add(pollset, pfd); + if (rv != APR_SUCCESS) { + AP_DEBUG_ASSERT(1); + } +} + +static void del_pollset(apr_pollset_t *pollset, apr_pollfd_t *pfd, + apr_int16_t events) +{ + apr_status_t rv; + + AP_DEBUG_ASSERT((pfd->reqevents & events) != 0); + + rv = apr_pollset_remove(pollset, pfd); + if (rv != APR_SUCCESS) { + AP_DEBUG_ASSERT(0); + return; + } + + if (events & APR_POLLIN) { + events |= APR_POLLHUP; + } + if (pfd->reqevents & ~(events | APR_POLLERR)) { + pfd->reqevents &= ~events; + rv = apr_pollset_add(pollset, pfd); + if (rv != APR_SUCCESS) { + AP_DEBUG_ASSERT(0); + return; + } + } + else { + pfd->reqevents = 0; + } +} + +static int proxy_tunnel_forward(proxy_tunnel_rec *tunnel, + struct proxy_tunnel_conn *in) +{ + struct proxy_tunnel_conn *out = in->other; + apr_status_t rv; + int sent = 0; + + ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, tunnel->r, + "proxy: %s: %s input ready", + tunnel->scheme, in->name); + + rv = ap_proxy_transfer_between_connections(tunnel->r, + in->c, out->c, + in->bb, out->bb, + in->name, &sent, + tunnel->read_buf_size, + AP_PROXY_TRANSFER_YIELD_PENDING | + AP_PROXY_TRANSFER_YIELD_MAX_READS); + if (sent && out == tunnel->client) { + tunnel->replied = 1; + } + if (rv != APR_SUCCESS) { + if (APR_STATUS_IS_INCOMPLETE(rv)) { + /* Pause POLLIN while waiting for POLLOUT on the other + * side, hence avoid filling the output filters even + * more to avoid blocking there. + */ + ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, tunnel->r, + "proxy: %s: %s wait writable", + tunnel->scheme, out->name); + } + else if (APR_STATUS_IS_EOF(rv)) { + /* Stop POLLIN and wait for POLLOUT (flush) on the + * other side to shut it down. + */ + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, tunnel->r, + "proxy: %s: %s read shutdown", + tunnel->scheme, in->name); + if (tunnel->nohalfclose) { + /* No half-close forwarding, we are done both ways as + * soon as one side shuts down. + */ + return DONE; + } + in->down_in = 1; + } + else { + /* Real failure, bail out */ + return HTTP_INTERNAL_SERVER_ERROR; + } + + del_pollset(tunnel->pollset, in->pfd, APR_POLLIN); + add_pollset(tunnel->pollset, out->pfd, APR_POLLOUT); + } + + return OK; +} + +PROXY_DECLARE(int) ap_proxy_tunnel_run(proxy_tunnel_rec *tunnel) +{ + int status = OK, rc; + request_rec *r = tunnel->r; + apr_pollset_t *pollset = tunnel->pollset; + struct proxy_tunnel_conn *client = tunnel->client, + *origin = tunnel->origin; + apr_interval_time_t timeout = tunnel->timeout >= 0 ? tunnel->timeout : -1; + const char *scheme = tunnel->scheme; + apr_status_t rv; + + ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(10212) + "proxy: %s: tunnel running (timeout %lf)", + scheme, timeout >= 0 ? (double)timeout / APR_USEC_PER_SEC + : (double)-1.0); + + /* Loop until both directions of the connection are closed, + * or a failure occurs. + */ + do { + const apr_pollfd_t *results; + apr_int32_t nresults, i; + + ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, + "proxy: %s: polling (client=%hx, origin=%hx)", + scheme, client->pfd->reqevents, origin->pfd->reqevents); + do { + rv = apr_pollset_poll(pollset, timeout, &nresults, &results); + } while (APR_STATUS_IS_EINTR(rv)); + + if (rv != APR_SUCCESS) { + if (APR_STATUS_IS_TIMEUP(rv)) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE2, 0, r, APLOGNO(10213) + "proxy: %s: polling timed out " + "(client=%hx, origin=%hx)", + scheme, client->pfd->reqevents, + origin->pfd->reqevents); + status = HTTP_GATEWAY_TIME_OUT; + } + else { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(10214) + "proxy: %s: polling failed", scheme); + status = HTTP_INTERNAL_SERVER_ERROR; + } + goto done; + } + + ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, APLOGNO(10215) + "proxy: %s: woken up, %i result(s)", scheme, nresults); + + for (i = 0; i < nresults; i++) { + const apr_pollfd_t *pfd = &results[i]; + struct proxy_tunnel_conn *tc = pfd->client_data; + + ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, + "proxy: %s: #%i: %s: %hx/%hx", scheme, i, + tc->name, pfd->rtnevents, tc->pfd->reqevents); + + /* sanity check */ + if (pfd->desc.s != client->pfd->desc.s + && pfd->desc.s != origin->pfd->desc.s) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10222) + "proxy: %s: unknown socket in pollset", scheme); + status = HTTP_INTERNAL_SERVER_ERROR; + goto done; + } + + if (!(pfd->rtnevents & (APR_POLLIN | APR_POLLOUT | + APR_POLLHUP | APR_POLLERR))) { + /* this catches POLLNVAL etc.. */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10220) + "proxy: %s: polling events error (%x)", + scheme, pfd->rtnevents); + status = HTTP_INTERNAL_SERVER_ERROR; + goto done; + } + + /* We want to write if we asked for POLLOUT and got: + * - POLLOUT: the socket is ready for write; + * - !POLLIN: the socket is in error state (POLLERR) so we let + * the user know by failing the write and log, OR the socket + * is shutdown for read already (POLLHUP) so we have to + * shutdown for write. + */ + if ((tc->pfd->reqevents & APR_POLLOUT) + && ((pfd->rtnevents & APR_POLLOUT) + || !(tc->pfd->reqevents & APR_POLLIN) + || !(pfd->rtnevents & (APR_POLLIN | APR_POLLHUP)))) { + struct proxy_tunnel_conn *out = tc, *in = tc->other; + + ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r, + "proxy: %s: %s output ready", + scheme, out->name); + + rc = ap_filter_output_pending(out->c); + if (rc == OK) { + /* Keep polling out (only) */ + continue; + } + if (rc != DECLINED) { + /* Real failure, bail out */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10221) + "proxy: %s: %s flushing failed (%i)", + scheme, out->name, rc); + status = rc; + goto done; + } + + /* No more pending data. If the other side is not readable + * anymore it's time to shutdown for write (this direction + * is over). Otherwise back to normal business. + */ + del_pollset(pollset, out->pfd, APR_POLLOUT); + if (in->down_in) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE3, 0, r, + "proxy: %s: %s write shutdown", + scheme, out->name); + apr_socket_shutdown(out->pfd->desc.s, 1); + out->down_out = 1; + } + else { + ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r, + "proxy: %s: %s resume writable", + scheme, out->name); + add_pollset(pollset, in->pfd, APR_POLLIN); + + /* Flush any pending input data now, we don't know when + * the next POLLIN will trigger and retaining data might + * deadlock the underlying protocol. We don't check for + * pending data first with ap_filter_input_pending() since + * the read from proxy_tunnel_forward() is nonblocking + * anyway and returning OK if there's no data. + */ + rc = proxy_tunnel_forward(tunnel, in); + if (rc != OK) { + status = rc; + goto done; + } + } + } + + /* We want to read if we asked for POLLIN|HUP and got: + * - POLLIN|HUP: the socket is ready for read or EOF (POLLHUP); + * - !POLLOUT: the socket is in error state (POLLERR) so we let + * the user know by failing the read and log. + */ + if ((tc->pfd->reqevents & APR_POLLIN) + && ((pfd->rtnevents & (APR_POLLIN | APR_POLLHUP)) + || !(pfd->rtnevents & APR_POLLOUT))) { + rc = proxy_tunnel_forward(tunnel, tc); + if (rc != OK) { + status = rc; + goto done; + } + } + } + } while (!client->down_out || !origin->down_out); + +done: + ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, APLOGNO(10223) + "proxy: %s: tunneling returns (%i)", scheme, status); + if (status == DONE) { + status = OK; + } + return status; +} + +PROXY_DECLARE (const char *) ap_proxy_show_hcmethod(hcmethod_t method) +{ + proxy_hcmethods_t *m = proxy_hcmethods; + for (; m->name; m++) { + if (m->method == method) { + return m->name; + } + } + return "???"; +} + +void proxy_util_register_hooks(apr_pool_t *p) +{ + APR_REGISTER_OPTIONAL_FN(ap_proxy_retry_worker); + APR_REGISTER_OPTIONAL_FN(ap_proxy_clear_connection); + APR_REGISTER_OPTIONAL_FN(proxy_balancer_get_best_worker); +} |