diff options
Diffstat (limited to 'server/protocol.c')
| -rw-r--r-- | server/protocol.c | 2456 |
1 files changed, 2456 insertions, 0 deletions
diff --git a/server/protocol.c b/server/protocol.c new file mode 100644 index 0000000..8d90055 --- /dev/null +++ b/server/protocol.c @@ -0,0 +1,2456 @@ +/* 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. + */ + +/* + * protocol.c --- routines which directly communicate with the client. + * + * Code originally by Rob McCool; much redone by Robert S. Thau + * and the Apache Software Foundation. + */ + +#include "apr.h" +#include "apr_strings.h" +#include "apr_buckets.h" +#include "apr_lib.h" +#include "apr_signal.h" +#include "apr_strmatch.h" + +#define APR_WANT_STDIO /* for sscanf */ +#define APR_WANT_STRFUNC +#define APR_WANT_MEMFUNC +#include "apr_want.h" + +#include "util_filter.h" +#include "ap_config.h" +#include "httpd.h" +#include "http_config.h" +#include "http_core.h" +#include "http_protocol.h" +#include "http_main.h" +#include "http_request.h" +#include "http_vhost.h" +#include "http_log.h" /* For errors detected in basic auth common + * support code... */ +#include "mod_core.h" +#include "util_charset.h" +#include "util_ebcdic.h" +#include "scoreboard.h" + +#if APR_HAVE_STDARG_H +#include <stdarg.h> +#endif +#if APR_HAVE_UNISTD_H +#include <unistd.h> +#endif + +/* we know core's module_index is 0 */ +#undef APLOG_MODULE_INDEX +#define APLOG_MODULE_INDEX AP_CORE_MODULE_INDEX + +APR_HOOK_STRUCT( + APR_HOOK_LINK(pre_read_request) + APR_HOOK_LINK(post_read_request) + APR_HOOK_LINK(log_transaction) + APR_HOOK_LINK(http_scheme) + APR_HOOK_LINK(default_port) + APR_HOOK_LINK(note_auth_failure) + APR_HOOK_LINK(protocol_propose) + APR_HOOK_LINK(protocol_switch) + APR_HOOK_LINK(protocol_get) +) + +AP_DECLARE_DATA ap_filter_rec_t *ap_old_write_func = NULL; + + +/* Patterns to match in ap_make_content_type() */ +static const char *needcset[] = { + "text/plain", + "text/html", + NULL +}; +static const apr_strmatch_pattern **needcset_patterns; +static const apr_strmatch_pattern *charset_pattern; + +AP_DECLARE(void) ap_setup_make_content_type(apr_pool_t *pool) +{ + int i; + for (i = 0; needcset[i]; i++) { + continue; + } + needcset_patterns = (const apr_strmatch_pattern **) + apr_palloc(pool, (i + 1) * sizeof(apr_strmatch_pattern *)); + for (i = 0; needcset[i]; i++) { + needcset_patterns[i] = apr_strmatch_precompile(pool, needcset[i], 0); + } + needcset_patterns[i] = NULL; + charset_pattern = apr_strmatch_precompile(pool, "charset=", 0); +} + +/* + * Builds the content-type that should be sent to the client from the + * content-type specified. The following rules are followed: + * - if type is NULL or "", return NULL (do not set content-type). + * - if charset adding is disabled, stop processing and return type. + * - then, if there are no parameters on type, add the default charset + * - return type + */ +AP_DECLARE(const char *)ap_make_content_type(request_rec *r, const char *type) +{ + const apr_strmatch_pattern **pcset; + core_dir_config *conf = + (core_dir_config *)ap_get_core_module_config(r->per_dir_config); + core_request_config *request_conf; + apr_size_t type_len; + + if (!type || *type == '\0') { + return NULL; + } + + if (conf->add_default_charset != ADD_DEFAULT_CHARSET_ON) { + return type; + } + + request_conf = ap_get_core_module_config(r->request_config); + if (request_conf->suppress_charset) { + return type; + } + + type_len = strlen(type); + + if (apr_strmatch(charset_pattern, type, type_len) != NULL) { + /* already has parameter, do nothing */ + /* XXX we don't check the validity */ + ; + } + else { + /* see if it makes sense to add the charset. At present, + * we only add it if the Content-type is one of needcset[] + */ + for (pcset = needcset_patterns; *pcset ; pcset++) { + if (apr_strmatch(*pcset, type, type_len) != NULL) { + struct iovec concat[3]; + concat[0].iov_base = (void *)type; + concat[0].iov_len = type_len; + concat[1].iov_base = (void *)"; charset="; + concat[1].iov_len = sizeof("; charset=") - 1; + concat[2].iov_base = (void *)(conf->add_default_charset_name); + concat[2].iov_len = strlen(conf->add_default_charset_name); + type = apr_pstrcatv(r->pool, concat, 3, NULL); + break; + } + } + } + + return type; +} + +AP_DECLARE(void) ap_set_content_length(request_rec *r, apr_off_t clength) +{ + r->clength = clength; + apr_table_setn(r->headers_out, "Content-Length", + apr_off_t_toa(r->pool, clength)); +} + +/* + * Return the latest rational time from a request/mtime (modification time) + * pair. We return the mtime unless it's in the future, in which case we + * return the current time. We use the request time as a reference in order + * to limit the number of calls to time(). We don't check for futurosity + * unless the mtime is at least as new as the reference. + */ +AP_DECLARE(apr_time_t) ap_rationalize_mtime(request_rec *r, apr_time_t mtime) +{ + apr_time_t now; + + /* For all static responses, it's almost certain that the file was + * last modified before the beginning of the request. So there's + * no reason to call time(NULL) again. But if the response has been + * created on demand, then it might be newer than the time the request + * started. In this event we really have to call time(NULL) again + * so that we can give the clients the most accurate Last-Modified. If we + * were given a time in the future, we return the current time - the + * Last-Modified can't be in the future. + */ + now = (mtime < r->request_time) ? r->request_time : apr_time_now(); + return (mtime > now) ? now : mtime; +} + +/* Get a line of protocol input, including any continuation lines + * caused by MIME folding (or broken clients) if fold != 0, and place it + * in the buffer s, of size n bytes, without the ending newline. + * + * Pulls from r->proto_input_filters instead of r->input_filters for + * stricter protocol adherence and better input filter behavior during + * chunked trailer processing (for http). + * + * If s is NULL, ap_rgetline_core will allocate necessary memory from r->pool. + * + * Returns APR_SUCCESS if there are no problems and sets *read to be + * the full length of s. + * + * APR_ENOSPC is returned if there is not enough buffer space. + * Other errors may be returned on other errors. + * + * The [CR]LF are *not* returned in the buffer. Therefore, a *read of 0 + * indicates that an empty line was read. + * + * Notes: Because the buffer uses 1 char for NUL, the most we can return is + * (n - 1) actual characters. + * + * If no LF is detected on the last line due to a dropped connection + * or a full buffer, that's considered an error. + */ +AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n, + apr_size_t *read, request_rec *r, + int flags, apr_bucket_brigade *bb) +{ + apr_status_t rv; + apr_bucket *e; + apr_size_t bytes_handled = 0, current_alloc = 0; + char *pos, *last_char = *s; + int do_alloc = (*s == NULL), saw_eos = 0; + int fold = flags & AP_GETLINE_FOLD; + int crlf = flags & AP_GETLINE_CRLF; + int nospc_eol = flags & AP_GETLINE_NOSPC_EOL; + int saw_eol = 0, saw_nospc = 0; + + if (!n) { + /* Needs room for NUL byte at least */ + *read = 0; + return APR_BADARG; + } + + /* + * Initialize last_char as otherwise a random value will be compared + * against APR_ASCII_LF at the end of the loop if bb only contains + * zero-length buckets. + */ + if (last_char) + *last_char = '\0'; + + do { + apr_brigade_cleanup(bb); + rv = ap_get_brigade(r->proto_input_filters, bb, AP_MODE_GETLINE, + APR_BLOCK_READ, 0); + if (rv != APR_SUCCESS) { + goto cleanup; + } + + /* Something horribly wrong happened. Someone didn't block! + * (this also happens at the end of each keepalive connection) + */ + if (APR_BRIGADE_EMPTY(bb)) { + rv = APR_EGENERAL; + goto cleanup; + } + + for (e = APR_BRIGADE_FIRST(bb); + e != APR_BRIGADE_SENTINEL(bb); + e = APR_BUCKET_NEXT(e)) + { + const char *str; + apr_size_t len; + + /* If we see an EOS, don't bother doing anything more. */ + if (APR_BUCKET_IS_EOS(e)) { + saw_eos = 1; + break; + } + + rv = apr_bucket_read(e, &str, &len, APR_BLOCK_READ); + if (rv != APR_SUCCESS) { + goto cleanup; + } + + if (len == 0) { + /* no use attempting a zero-byte alloc (hurts when + * using --with-efence --enable-pool-debug) or + * doing any of the other logic either + */ + continue; + } + + /* Would this overrun our buffer? If so, we'll die. */ + if (n < bytes_handled + len) { + /* Before we die, let's fill the buffer up to its limit (i.e. + * fall through with the remaining length, if any), setting + * saw_eol on LF to stop the outer loop appropriately; we may + * come back here once the buffer is filled (no LF seen), and + * either be done at that time or continue to wait for LF here + * if nospc_eol is set. + * + * But there is also a corner cases which we want to address, + * namely if the buffer is overrun by the final LF only (i.e. + * the CR fits in); this is not really an overrun since we'll + * strip the CR finally (and use it for NUL byte), but anyway + * we have to handle the case so that it's not returned to the + * caller as part of the truncated line (it's not!). This is + * easier to consider that LF is out of counting and thus fall + * through with no error (saw_eol is set to 2 so that we later + * ignore LF handling already done here), while folding and + * nospc_eol logics continue to work (or fail) appropriately. + */ + saw_eol = (str[len - 1] == APR_ASCII_LF); + if (/* First time around */ + saw_eol && !saw_nospc + /* Single LF completing the buffered CR, */ + && ((len == 1 && ((*s)[bytes_handled - 1] == APR_ASCII_CR)) + /* or trailing CRLF overuns by LF only */ + || (len > 1 && str[len - 2] == APR_ASCII_CR + && n - bytes_handled + 1 == len))) { + /* In both cases *last_char is (to be) the CR stripped by + * later 'bytes_handled = last_char - *s'. + */ + saw_eol = 2; + } + else { + /* In any other case we'd lose data. */ + rv = APR_ENOSPC; + saw_nospc = 1; + } + len = n - bytes_handled; + if (!len) { + if (saw_eol) { + break; + } + if (nospc_eol) { + continue; + } + goto cleanup; + } + } + + /* Do we have to handle the allocation ourselves? */ + if (do_alloc) { + /* We'll assume the common case where one bucket is enough. */ + if (!*s) { + current_alloc = len; + *s = apr_palloc(r->pool, current_alloc + 1); + } + else if (bytes_handled + len > current_alloc) { + /* Increase the buffer size */ + apr_size_t new_size = current_alloc * 2; + char *new_buffer; + + if (bytes_handled + len > new_size) { + new_size = (bytes_handled + len) * 2; + } + + new_buffer = apr_palloc(r->pool, new_size + 1); + + /* Copy what we already had. */ + memcpy(new_buffer, *s, bytes_handled); + current_alloc = new_size; + *s = new_buffer; + } + } + + /* Just copy the rest of the data to the end of the old buffer. */ + pos = *s + bytes_handled; + memcpy(pos, str, len); + last_char = pos + len - 1; + + /* We've now processed that new data - update accordingly. */ + bytes_handled += len; + } + + /* If we got a full line of input, stop reading */ + if (last_char && (*last_char == APR_ASCII_LF)) { + saw_eol = 1; + } + } while (!saw_eol); + + if (rv != APR_SUCCESS) { + /* End of line after APR_ENOSPC above */ + goto cleanup; + } + + /* Now terminate the string at the end of the line; + * if the last-but-one character is a CR, terminate there. + * LF is handled above (not accounted) when saw_eol == 2, + * the last char is CR to terminate at still. + */ + if (saw_eol < 2) { + if (last_char > *s && last_char[-1] == APR_ASCII_CR) { + last_char--; + } + else if (crlf) { + rv = APR_EINVAL; + goto cleanup; + } + } + bytes_handled = last_char - *s; + + /* If we're folding, we have more work to do. + * + * Note that if an EOS was seen, we know we can't have another line. + */ + if (fold && bytes_handled && !saw_eos) { + for (;;) { + const char *str; + apr_size_t len; + char c; + + /* Clear the temp brigade for this filter read. */ + apr_brigade_cleanup(bb); + + /* We only care about the first byte. */ + rv = ap_get_brigade(r->proto_input_filters, bb, AP_MODE_SPECULATIVE, + APR_BLOCK_READ, 1); + if (rv != APR_SUCCESS) { + goto cleanup; + } + + if (APR_BRIGADE_EMPTY(bb)) { + break; + } + + e = APR_BRIGADE_FIRST(bb); + + /* If we see an EOS, don't bother doing anything more. */ + if (APR_BUCKET_IS_EOS(e)) { + break; + } + + rv = apr_bucket_read(e, &str, &len, APR_BLOCK_READ); + if (rv != APR_SUCCESS) { + apr_brigade_cleanup(bb); + goto cleanup; + } + + /* Found one, so call ourselves again to get the next line. + * + * FIXME: If the folding line is completely blank, should we + * stop folding? Does that require also looking at the next + * char? + */ + /* When we call destroy, the buckets are deleted, so save that + * one character we need. This simplifies our execution paths + * at the cost of one character read. + */ + c = *str; + if (c == APR_ASCII_BLANK || c == APR_ASCII_TAB) { + /* Do we have enough space? We may be full now. */ + if (bytes_handled >= n) { + rv = APR_ENOSPC; + goto cleanup; + } + else { + apr_size_t next_size, next_len; + char *tmp; + + /* If we're doing the allocations for them, we have to + * give ourselves a NULL and copy it on return. + */ + if (do_alloc) { + tmp = NULL; + } + else { + tmp = last_char; + } + + next_size = n - bytes_handled; + + rv = ap_rgetline_core(&tmp, next_size, &next_len, r, + flags & ~AP_GETLINE_FOLD, bb); + if (rv != APR_SUCCESS) { + goto cleanup; + } + + if (do_alloc && next_len > 0) { + char *new_buffer; + apr_size_t new_size = bytes_handled + next_len + 1; + + /* we need to alloc an extra byte for a null */ + new_buffer = apr_palloc(r->pool, new_size); + + /* Copy what we already had. */ + memcpy(new_buffer, *s, bytes_handled); + + /* copy the new line, including the trailing null */ + memcpy(new_buffer + bytes_handled, tmp, next_len); + *s = new_buffer; + } + + last_char += next_len; + bytes_handled += next_len; + } + } + else { /* next character is not tab or space */ + break; + } + } + } + +cleanup: + if (bytes_handled >= n) { + bytes_handled = n - 1; + } + + *read = bytes_handled; + if (*s) { + /* ensure the string is NUL terminated */ + (*s)[*read] = '\0'; + + /* PR#43039: We shouldn't accept NULL bytes within the line */ + bytes_handled = strlen(*s); + if (bytes_handled < *read) { + *read = bytes_handled; + if (rv == APR_SUCCESS) { + rv = APR_EINVAL; + } + } + } + return rv; +} + +#if APR_CHARSET_EBCDIC +AP_DECLARE(apr_status_t) ap_rgetline(char **s, apr_size_t n, + apr_size_t *read, request_rec *r, + int fold, apr_bucket_brigade *bb) +{ + /* on ASCII boxes, ap_rgetline is a macro which simply invokes + * ap_rgetline_core with the same parms + * + * on EBCDIC boxes, each complete http protocol input line needs to be + * translated into the code page used by the compiler. Since + * ap_rgetline_core uses recursion, we do the translation in a wrapper + * function to ensure that each input character gets translated only once. + */ + apr_status_t rv; + + rv = ap_rgetline_core(s, n, read, r, fold, bb); + if (rv == APR_SUCCESS || APR_STATUS_IS_ENOSPC(rv)) { + ap_xlate_proto_from_ascii(*s, *read); + } + return rv; +} +#endif + +AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int flags) +{ + char *tmp_s = s; + apr_status_t rv; + apr_size_t len; + apr_bucket_brigade *tmp_bb; + + if (n < 1) { + /* Can't work since we always NUL terminate */ + return -1; + } + + tmp_bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); + rv = ap_rgetline(&tmp_s, n, &len, r, flags, tmp_bb); + apr_brigade_destroy(tmp_bb); + + /* Map the out-of-space condition to the old API. */ + if (rv == APR_ENOSPC) { + return n; + } + + /* Anything else is just bad. */ + if (rv != APR_SUCCESS) { + return -1; + } + + return (int)len; +} + +/* parse_uri: break apart the uri + * Side Effects: + * - sets r->args to rest after '?' (or NULL if no '?') + * - sets r->uri to request uri (without r->args part) + * - sets r->hostname (if not set already) from request (scheme://host:port) + */ +AP_CORE_DECLARE(void) ap_parse_uri(request_rec *r, const char *uri) +{ + int status = HTTP_OK; + + r->unparsed_uri = apr_pstrdup(r->pool, uri); + + /* http://issues.apache.org/bugzilla/show_bug.cgi?id=31875 + * http://issues.apache.org/bugzilla/show_bug.cgi?id=28450 + * + * This is not in fact a URI, it's a path. That matters in the + * case of a leading double-slash. We need to resolve the issue + * by normalizing that out before treating it as a URI. + */ + while ((uri[0] == '/') && (uri[1] == '/')) { + ++uri ; + } + if (r->method_number == M_CONNECT) { + status = apr_uri_parse_hostinfo(r->pool, uri, &r->parsed_uri); + } + else { + status = apr_uri_parse(r->pool, uri, &r->parsed_uri); + } + + if (status == APR_SUCCESS) { + /* if it has a scheme we may need to do absoluteURI vhost stuff */ + if (r->parsed_uri.scheme + && !strcasecmp(r->parsed_uri.scheme, ap_http_scheme(r))) { + r->hostname = r->parsed_uri.hostname; + } + else if (r->method_number == M_CONNECT) { + r->hostname = r->parsed_uri.hostname; + } + + r->args = r->parsed_uri.query; + r->uri = r->parsed_uri.path ? r->parsed_uri.path + : apr_pstrdup(r->pool, "/"); + +#if defined(OS2) || defined(WIN32) + /* Handle path translations for OS/2 and plug security hole. + * This will prevent "http://www.wherever.com/..\..\/" from + * returning a directory for the root drive. + */ + { + char *x; + + for (x = r->uri; (x = strchr(x, '\\')) != NULL; ) + *x = '/'; + } +#endif /* OS2 || WIN32 */ + } + else { + r->args = NULL; + r->hostname = NULL; + r->status = HTTP_BAD_REQUEST; /* set error status */ + r->uri = apr_pstrdup(r->pool, uri); + } +} + +/* get the length of the field name for logging, but no more than 80 bytes */ +#define LOG_NAME_MAX_LEN 80 +static int field_name_len(const char *field) +{ + const char *end = ap_strchr_c(field, ':'); + if (end == NULL || end - field > LOG_NAME_MAX_LEN) + return LOG_NAME_MAX_LEN; + return end - field; +} + +static int read_request_line(request_rec *r, apr_bucket_brigade *bb) +{ + enum { + rrl_none, rrl_badmethod, rrl_badwhitespace, rrl_excesswhitespace, + rrl_missinguri, rrl_baduri, rrl_badprotocol, rrl_trailingtext, + rrl_badmethod09, rrl_reject09 + } deferred_error = rrl_none; + char *ll; + char *uri; + apr_size_t len; + int num_blank_lines = DEFAULT_LIMIT_BLANK_LINES; + core_server_config *conf = ap_get_core_module_config(r->server->module_config); + int strict = (conf->http_conformance != AP_HTTP_CONFORMANCE_UNSAFE); + + /* Read past empty lines until we get a real request line, + * a read error, the connection closes (EOF), or we timeout. + * + * We skip empty lines because browsers have to tack a CRLF on to the end + * of POSTs to support old CERN webservers. But note that we may not + * have flushed any previous response completely to the client yet. + * We delay the flush as long as possible so that we can improve + * performance for clients that are pipelining requests. If a request + * is pipelined then we won't block during the (implicit) read() below. + * If the requests aren't pipelined, then the client is still waiting + * for the final buffer flush from us, and we will block in the implicit + * read(). B_SAFEREAD ensures that the BUFF layer flushes if it will + * have to block during a read. + */ + + do { + apr_status_t rv; + + /* ensure ap_rgetline allocates memory each time thru the loop + * if there are empty lines + */ + r->the_request = NULL; + rv = ap_rgetline(&(r->the_request), (apr_size_t)(r->server->limit_req_line + 2), + &len, r, strict ? AP_GETLINE_CRLF : 0, bb); + + if (rv != APR_SUCCESS) { + r->request_time = apr_time_now(); + + /* ap_rgetline returns APR_ENOSPC if it fills up the + * buffer before finding the end-of-line. This is only going to + * happen if it exceeds the configured limit for a request-line. + */ + if (APR_STATUS_IS_ENOSPC(rv)) { + r->status = HTTP_REQUEST_URI_TOO_LARGE; + } + else if (APR_STATUS_IS_TIMEUP(rv)) { + r->status = HTTP_REQUEST_TIME_OUT; + } + else if (APR_STATUS_IS_EINVAL(rv)) { + r->status = HTTP_BAD_REQUEST; + } + r->proto_num = HTTP_VERSION(1,0); + r->protocol = apr_pstrdup(r->pool, "HTTP/1.0"); + return 0; + } + } while ((len <= 0) && (--num_blank_lines >= 0)); + + if (APLOGrtrace5(r)) { + ap_log_rerror(APLOG_MARK, APLOG_TRACE5, 0, r, + "Request received from client: %s", + ap_escape_logitem(r->pool, r->the_request)); + } + + r->request_time = apr_time_now(); + + r->method = r->the_request; + + /* If there is whitespace before a method, skip it and mark in error */ + if (apr_isspace(*r->method)) { + deferred_error = rrl_badwhitespace; + for ( ; apr_isspace(*r->method); ++r->method) + ; + } + + /* Scan the method up to the next whitespace, ensure it contains only + * valid http-token characters, otherwise mark in error + */ + if (strict) { + ll = (char*) ap_scan_http_token(r->method); + } + else { + ll = (char*) ap_scan_vchar_obstext(r->method); + } + + if (((ll == r->method) || (*ll && !apr_isspace(*ll))) + && deferred_error == rrl_none) { + deferred_error = rrl_badmethod; + ll = strpbrk(ll, "\t\n\v\f\r "); + } + + /* Verify method terminated with a single SP, or mark as specific error */ + if (!ll) { + if (deferred_error == rrl_none) + deferred_error = rrl_missinguri; + r->protocol = uri = ""; + len = 0; + goto rrl_done; + } + else if (strict && ll[0] && apr_isspace(ll[1]) + && deferred_error == rrl_none) { + deferred_error = rrl_excesswhitespace; + } + + /* Advance uri pointer over leading whitespace, NUL terminate the method + * If non-SP whitespace is encountered, mark as specific error + */ + for (uri = ll; apr_isspace(*uri); ++uri) + if (*uri != ' ' && deferred_error == rrl_none) + deferred_error = rrl_badwhitespace; + *ll = '\0'; + + if (!*uri && deferred_error == rrl_none) + deferred_error = rrl_missinguri; + + /* Scan the URI up to the next whitespace, ensure it contains no raw + * control characters, otherwise mark in error + */ + ll = (char*) ap_scan_vchar_obstext(uri); + if (ll == uri || (*ll && !apr_isspace(*ll))) { + deferred_error = rrl_baduri; + ll = strpbrk(ll, "\t\n\v\f\r "); + } + + /* Verify URI terminated with a single SP, or mark as specific error */ + if (!ll) { + r->protocol = ""; + len = 0; + goto rrl_done; + } + else if (strict && ll[0] && apr_isspace(ll[1]) + && deferred_error == rrl_none) { + deferred_error = rrl_excesswhitespace; + } + + /* Advance protocol pointer over leading whitespace, NUL terminate the uri + * If non-SP whitespace is encountered, mark as specific error + */ + for (r->protocol = ll; apr_isspace(*r->protocol); ++r->protocol) + if (*r->protocol != ' ' && deferred_error == rrl_none) + deferred_error = rrl_badwhitespace; + *ll = '\0'; + + /* Scan the protocol up to the next whitespace, validation comes later */ + if (!(ll = (char*) ap_scan_vchar_obstext(r->protocol))) { + len = strlen(r->protocol); + goto rrl_done; + } + len = ll - r->protocol; + + /* Advance over trailing whitespace, if found mark in error, + * determine if trailing text is found, unconditionally mark in error, + * finally NUL terminate the protocol string + */ + if (*ll && !apr_isspace(*ll)) { + deferred_error = rrl_badprotocol; + } + else if (strict && *ll) { + deferred_error = rrl_excesswhitespace; + } + else { + for ( ; apr_isspace(*ll); ++ll) + if (*ll != ' ' && deferred_error == rrl_none) + deferred_error = rrl_badwhitespace; + if (*ll && deferred_error == rrl_none) + deferred_error = rrl_trailingtext; + } + *((char *)r->protocol + len) = '\0'; + +rrl_done: + /* For internal integrity and palloc efficiency, reconstruct the_request + * in one palloc, using only single SP characters, per spec. + */ + r->the_request = apr_pstrcat(r->pool, r->method, *uri ? " " : NULL, uri, + *r->protocol ? " " : NULL, r->protocol, NULL); + + if (len == 8 + && r->protocol[0] == 'H' && r->protocol[1] == 'T' + && r->protocol[2] == 'T' && r->protocol[3] == 'P' + && r->protocol[4] == '/' && apr_isdigit(r->protocol[5]) + && r->protocol[6] == '.' && apr_isdigit(r->protocol[7]) + && r->protocol[5] != '0') { + r->assbackwards = 0; + r->proto_num = HTTP_VERSION(r->protocol[5] - '0', r->protocol[7] - '0'); + } + else if (len == 8 + && (r->protocol[0] == 'H' || r->protocol[0] == 'h') + && (r->protocol[1] == 'T' || r->protocol[1] == 't') + && (r->protocol[2] == 'T' || r->protocol[2] == 't') + && (r->protocol[3] == 'P' || r->protocol[3] == 'p') + && r->protocol[4] == '/' && apr_isdigit(r->protocol[5]) + && r->protocol[6] == '.' && apr_isdigit(r->protocol[7]) + && r->protocol[5] != '0') { + r->assbackwards = 0; + r->proto_num = HTTP_VERSION(r->protocol[5] - '0', r->protocol[7] - '0'); + if (strict && deferred_error == rrl_none) + deferred_error = rrl_badprotocol; + else + memcpy((char*)r->protocol, "HTTP", 4); + } + else if (r->protocol[0]) { + r->proto_num = HTTP_VERSION(0, 9); + /* Defer setting the r->protocol string till error msg is composed */ + if (deferred_error == rrl_none) + deferred_error = rrl_badprotocol; + } + else { + r->assbackwards = 1; + r->protocol = apr_pstrdup(r->pool, "HTTP/0.9"); + r->proto_num = HTTP_VERSION(0, 9); + } + + /* Determine the method_number and parse the uri prior to invoking error + * handling, such that these fields are available for substitution + */ + r->method_number = ap_method_number_of(r->method); + if (r->method_number == M_GET && r->method[0] == 'H') + r->header_only = 1; + + ap_parse_uri(r, uri); + + /* With the request understood, we can consider HTTP/0.9 specific errors */ + if (r->proto_num == HTTP_VERSION(0, 9) && deferred_error == rrl_none) { + if (conf->http09_enable == AP_HTTP09_DISABLE) + deferred_error = rrl_reject09; + else if (strict && (r->method_number != M_GET || r->header_only)) + deferred_error = rrl_badmethod09; + } + + /* Now that the method, uri and protocol are all processed, + * we can safely resume any deferred error reporting + */ + if (deferred_error != rrl_none) { + if (deferred_error == rrl_badmethod) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03445) + "HTTP Request Line; Invalid method token: '%.*s'", + field_name_len(r->method), r->method); + else if (deferred_error == rrl_badmethod09) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03444) + "HTTP Request Line; Invalid method token: '%.*s'" + " (only GET is allowed for HTTP/0.9 requests)", + field_name_len(r->method), r->method); + else if (deferred_error == rrl_missinguri) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03446) + "HTTP Request Line; Missing URI"); + else if (deferred_error == rrl_baduri) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03454) + "HTTP Request Line; URI incorrectly encoded: '%.*s'", + field_name_len(r->unparsed_uri), r->unparsed_uri); + else if (deferred_error == rrl_badwhitespace) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03447) + "HTTP Request Line; Invalid whitespace"); + else if (deferred_error == rrl_excesswhitespace) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03448) + "HTTP Request Line; Excess whitespace " + "(disallowed by HttpProtocolOptions Strict"); + else if (deferred_error == rrl_trailingtext) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03449) + "HTTP Request Line; Extraneous text found '%.*s' " + "(perhaps whitespace was injected?)", + field_name_len(ll), ll); + else if (deferred_error == rrl_reject09) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02401) + "HTTP Request Line; Rejected HTTP/0.9 request"); + else if (deferred_error == rrl_badprotocol) + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02418) + "HTTP Request Line; Unrecognized protocol '%.*s' " + "(perhaps whitespace was injected?)", + field_name_len(r->protocol), r->protocol); + r->status = HTTP_BAD_REQUEST; + goto rrl_failed; + } + + if (conf->http_methods == AP_HTTP_METHODS_REGISTERED + && r->method_number == M_INVALID) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02423) + "HTTP Request Line; Unrecognized HTTP method: '%.*s' " + "(disallowed by RegisteredMethods)", + field_name_len(r->method), r->method); + r->status = HTTP_NOT_IMPLEMENTED; + /* This can't happen in an HTTP/0.9 request, we verified GET above */ + return 0; + } + + if (r->status != HTTP_OK) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03450) + "HTTP Request Line; Unable to parse URI: '%.*s'", + field_name_len(r->uri), r->uri); + goto rrl_failed; + } + + if (strict) { + if (r->parsed_uri.fragment) { + /* RFC3986 3.5: no fragment */ + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02421) + "HTTP Request Line; URI must not contain a fragment"); + r->status = HTTP_BAD_REQUEST; + goto rrl_failed; + } + if (r->parsed_uri.user || r->parsed_uri.password) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02422) + "HTTP Request Line; URI must not contain a " + "username/password"); + r->status = HTTP_BAD_REQUEST; + goto rrl_failed; + } + } + + return 1; + +rrl_failed: + if (r->proto_num == HTTP_VERSION(0, 9)) { + /* Send all parsing and protocol error response with 1.x behavior, + * and reserve 505 errors for actual HTTP protocols presented. + * As called out in RFC7230 3.5, any errors parsing the protocol + * from the request line are nearly always misencoded HTTP/1.x + * requests. Only a valid 0.9 request with no parsing errors + * at all may be treated as a simple request, if allowed. + */ + r->assbackwards = 0; + r->connection->keepalive = AP_CONN_CLOSE; + r->proto_num = HTTP_VERSION(1, 0); + r->protocol = apr_pstrdup(r->pool, "HTTP/1.0"); + } + return 0; +} + +static int table_do_fn_check_lengths(void *r_, const char *key, + const char *value) +{ + request_rec *r = r_; + if (value == NULL || r->server->limit_req_fieldsize >= strlen(value) ) + return 1; + + r->status = HTTP_BAD_REQUEST; + apr_table_setn(r->notes, "error-notes", + "Size of a request header field exceeds server limit."); + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00560) "Request " + "header exceeds LimitRequestFieldSize after merging: %.*s", + field_name_len(key), key); + return 0; +} + +AP_DECLARE(void) ap_get_mime_headers_core(request_rec *r, apr_bucket_brigade *bb) +{ + char *last_field = NULL; + apr_size_t last_len = 0; + apr_size_t alloc_len = 0; + char *field; + char *value; + apr_size_t len; + int fields_read = 0; + char *tmp_field; + core_server_config *conf = ap_get_core_module_config(r->server->module_config); + int strict = (conf->http_conformance != AP_HTTP_CONFORMANCE_UNSAFE); + + /* + * Read header lines until we get the empty separator line, a read error, + * the connection closes (EOF), reach the server limit, or we timeout. + */ + while(1) { + apr_status_t rv; + + field = NULL; + rv = ap_rgetline(&field, r->server->limit_req_fieldsize + 2, + &len, r, strict ? AP_GETLINE_CRLF : 0, bb); + + if (rv != APR_SUCCESS) { + if (APR_STATUS_IS_TIMEUP(rv)) { + r->status = HTTP_REQUEST_TIME_OUT; + } + else { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, rv, r, + "Failed to read request header line %s", field); + r->status = HTTP_BAD_REQUEST; + } + + /* ap_rgetline returns APR_ENOSPC if it fills up the buffer before + * finding the end-of-line. This is only going to happen if it + * exceeds the configured limit for a field size. + */ + if (rv == APR_ENOSPC) { + apr_table_setn(r->notes, "error-notes", + "Size of a request header field " + "exceeds server limit."); + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00561) + "Request header exceeds LimitRequestFieldSize%s" + "%.*s", + (field && *field) ? ": " : "", + (field) ? field_name_len(field) : 0, + (field) ? field : ""); + } + return; + } + + /* For all header values, and all obs-fold lines, the presence of + * additional whitespace is a no-op, so collapse trailing whitespace + * to save buffer allocation and optimize copy operations. + * Do not remove the last single whitespace under any condition. + */ + while (len > 1 && (field[len-1] == '\t' || field[len-1] == ' ')) { + field[--len] = '\0'; + } + + if (*field == '\t' || *field == ' ') { + + /* Append any newly-read obs-fold line onto the preceding + * last_field line we are processing + */ + apr_size_t fold_len; + + if (last_field == NULL) { + r->status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03442) + "Line folding encountered before first" + " header line"); + return; + } + + if (field[1] == '\0') { + r->status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03443) + "Empty folded line encountered"); + return; + } + + /* Leading whitespace on an obs-fold line can be + * similarly discarded */ + while (field[1] == '\t' || field[1] == ' ') { + ++field; --len; + } + + /* This line is a continuation of the preceding line(s), + * so append it to the line that we've set aside. + * Note: this uses a power-of-two allocator to avoid + * doing O(n) allocs and using O(n^2) space for + * continuations that span many many lines. + */ + fold_len = last_len + len + 1; /* trailing null */ + + if (fold_len >= (apr_size_t)(r->server->limit_req_fieldsize)) { + r->status = HTTP_BAD_REQUEST; + /* report what we have accumulated so far before the + * overflow (last_field) as the field with the problem + */ + apr_table_setn(r->notes, "error-notes", + "Size of a request header field " + "exceeds server limit."); + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00562) + "Request header exceeds LimitRequestFieldSize " + "after folding: %.*s", + field_name_len(last_field), last_field); + return; + } + + if (fold_len > alloc_len) { + char *fold_buf; + alloc_len += alloc_len; + if (fold_len > alloc_len) { + alloc_len = fold_len; + } + fold_buf = (char *)apr_palloc(r->pool, alloc_len); + memcpy(fold_buf, last_field, last_len); + last_field = fold_buf; + } + memcpy(last_field + last_len, field, len +1); /* +1 for nul */ + /* Replace obs-fold w/ SP per RFC 7230 3.2.4 */ + last_field[last_len] = ' '; + last_len += len; + + /* We've appended this obs-fold line to last_len, proceed to + * read the next input line + */ + continue; + } + else if (last_field != NULL) { + + /* Process the previous last_field header line with all obs-folded + * segments already concatenated (this is not operating on the + * most recently read input line). + */ + + if (r->server->limit_req_fields + && (++fields_read > r->server->limit_req_fields)) { + r->status = HTTP_BAD_REQUEST; + apr_table_setn(r->notes, "error-notes", + "The number of request header fields " + "exceeds this server's limit."); + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00563) + "Number of request headers exceeds " + "LimitRequestFields"); + return; + } + + if (!strict) + { + /* Not Strict ('Unsafe' mode), using the legacy parser */ + + if (!(value = strchr(last_field, ':'))) { /* Find ':' or */ + r->status = HTTP_BAD_REQUEST; /* abort bad request */ + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00564) + "Request header field is missing ':' " + "separator: %.*s", (int)LOG_NAME_MAX_LEN, + last_field); + return; + } + + if (value == last_field) { + r->status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03453) + "Request header field name was empty"); + return; + } + + *value++ = '\0'; /* NUL-terminate at colon */ + + if (strpbrk(last_field, "\t\n\v\f\r ")) { + r->status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03452) + "Request header field name presented" + " invalid whitespace"); + return; + } + + while (*value == ' ' || *value == '\t') { + ++value; /* Skip to start of value */ + } + + if (strpbrk(value, "\n\v\f\r")) { + r->status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03451) + "Request header field value presented" + " bad whitespace"); + return; + } + } + else /* Using strict RFC7230 parsing */ + { + /* Ensure valid token chars before ':' per RFC 7230 3.2.4 */ + value = (char *)ap_scan_http_token(last_field); + if ((value == last_field) || *value != ':') { + r->status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02426) + "Request header field name is malformed: " + "%.*s", (int)LOG_NAME_MAX_LEN, last_field); + return; + } + + *value++ = '\0'; /* NUL-terminate last_field name at ':' */ + + while (*value == ' ' || *value == '\t') { + ++value; /* Skip LWS of value */ + } + + /* Find invalid, non-HT ctrl char, or the trailing NULL */ + tmp_field = (char *)ap_scan_http_field_content(value); + + /* Reject value for all garbage input (CTRLs excluding HT) + * e.g. only VCHAR / SP / HT / obs-text are allowed per + * RFC7230 3.2.6 - leave all more explicit rule enforcement + * for specific header handler logic later in the cycle + */ + if (*tmp_field != '\0') { + r->status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02427) + "Request header value is malformed: " + "%.*s", (int)LOG_NAME_MAX_LEN, value); + return; + } + } + + apr_table_addn(r->headers_in, last_field, value); + + /* This last_field header is now stored in headers_in, + * resume processing of the current input line. + */ + } + + /* Found the terminating empty end-of-headers line, stop. */ + if (len == 0) { + break; + } + + /* Keep track of this new header line so that we can extend it across + * any obs-fold or parse it on the next loop iteration. We referenced + * our previously allocated buffer in r->headers_in, + * so allocate a fresh buffer if required. + */ + alloc_len = 0; + last_field = field; + last_len = len; + } + + /* Combine multiple message-header fields with the same + * field-name, following RFC 2616, 4.2. + */ + apr_table_compress(r->headers_in, APR_OVERLAP_TABLES_MERGE); + + /* enforce LimitRequestFieldSize for merged headers */ + apr_table_do(table_do_fn_check_lengths, r, r->headers_in, NULL); +} + +AP_DECLARE(void) ap_get_mime_headers(request_rec *r) +{ + apr_bucket_brigade *tmp_bb; + tmp_bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); + ap_get_mime_headers_core(r, tmp_bb); + apr_brigade_destroy(tmp_bb); +} + +request_rec *ap_read_request(conn_rec *conn) +{ + request_rec *r; + apr_pool_t *p; + const char *expect; + int access_status; + apr_bucket_brigade *tmp_bb; + apr_socket_t *csd; + apr_interval_time_t cur_timeout; + + + apr_pool_create(&p, conn->pool); + apr_pool_tag(p, "request"); + r = apr_pcalloc(p, sizeof(request_rec)); + AP_READ_REQUEST_ENTRY((intptr_t)r, (uintptr_t)conn); + r->pool = p; + r->connection = conn; + r->server = conn->base_server; + + r->user = NULL; + r->ap_auth_type = NULL; + + r->allowed_methods = ap_make_method_list(p, 2); + + r->headers_in = apr_table_make(r->pool, 25); + r->trailers_in = apr_table_make(r->pool, 5); + r->subprocess_env = apr_table_make(r->pool, 25); + r->headers_out = apr_table_make(r->pool, 12); + r->err_headers_out = apr_table_make(r->pool, 5); + r->trailers_out = apr_table_make(r->pool, 5); + r->notes = apr_table_make(r->pool, 5); + + r->request_config = ap_create_request_config(r->pool); + /* Must be set before we run create request hook */ + + r->proto_output_filters = conn->output_filters; + r->output_filters = r->proto_output_filters; + r->proto_input_filters = conn->input_filters; + r->input_filters = r->proto_input_filters; + ap_run_create_request(r); + r->per_dir_config = r->server->lookup_defaults; + + r->sent_bodyct = 0; /* bytect isn't for body */ + + r->read_length = 0; + r->read_body = REQUEST_NO_BODY; + + r->status = HTTP_OK; /* Until further notice */ + r->the_request = NULL; + + /* Begin by presuming any module can make its own path_info assumptions, + * until some module interjects and changes the value. + */ + r->used_path_info = AP_REQ_DEFAULT_PATH_INFO; + + r->useragent_addr = conn->client_addr; + r->useragent_ip = conn->client_ip; + + tmp_bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); + + ap_run_pre_read_request(r, conn); + + /* Get the request... */ + if (!read_request_line(r, tmp_bb)) { + switch (r->status) { + case HTTP_REQUEST_URI_TOO_LARGE: + case HTTP_BAD_REQUEST: + case HTTP_VERSION_NOT_SUPPORTED: + case HTTP_NOT_IMPLEMENTED: + if (r->status == HTTP_REQUEST_URI_TOO_LARGE) { + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00565) + "request failed: client's request-line exceeds LimitRequestLine (longer than %d)", + r->server->limit_req_line); + } + else if (r->method == NULL) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00566) + "request failed: malformed request line"); + } + access_status = r->status; + r->status = HTTP_OK; + ap_die(access_status, r); + ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); + ap_run_log_transaction(r); + r = NULL; + apr_brigade_destroy(tmp_bb); + goto traceout; + case HTTP_REQUEST_TIME_OUT: + ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, NULL); + if (!r->connection->keepalives) + ap_run_log_transaction(r); + apr_brigade_destroy(tmp_bb); + goto traceout; + default: + apr_brigade_destroy(tmp_bb); + r = NULL; + goto traceout; + } + } + + /* We may have been in keep_alive_timeout mode, so toggle back + * to the normal timeout mode as we fetch the header lines, + * as necessary. + */ + csd = ap_get_conn_socket(conn); + apr_socket_timeout_get(csd, &cur_timeout); + if (cur_timeout != conn->base_server->timeout) { + apr_socket_timeout_set(csd, conn->base_server->timeout); + cur_timeout = conn->base_server->timeout; + } + + if (!r->assbackwards) { + const char *tenc; + + ap_get_mime_headers_core(r, tmp_bb); + if (r->status != HTTP_OK) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00567) + "request failed: error reading the headers"); + ap_send_error_response(r, 0); + ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); + ap_run_log_transaction(r); + apr_brigade_destroy(tmp_bb); + goto traceout; + } + + tenc = apr_table_get(r->headers_in, "Transfer-Encoding"); + if (tenc) { + /* http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-23 + * Section 3.3.3.3: "If a Transfer-Encoding header field is + * present in a request and the chunked transfer coding is not + * the final encoding ...; the server MUST respond with the 400 + * (Bad Request) status code and then close the connection". + */ + if (!(strcasecmp(tenc, "chunked") == 0 /* fast path */ + || ap_find_last_token(r->pool, tenc, "chunked"))) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02539) + "client sent unknown Transfer-Encoding " + "(%s): %s", tenc, r->uri); + r->status = HTTP_BAD_REQUEST; + conn->keepalive = AP_CONN_CLOSE; + ap_send_error_response(r, 0); + ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); + ap_run_log_transaction(r); + apr_brigade_destroy(tmp_bb); + goto traceout; + } + + /* http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-23 + * Section 3.3.3.3: "If a message is received with both a + * Transfer-Encoding and a Content-Length header field, the + * Transfer-Encoding overrides the Content-Length. ... A sender + * MUST remove the received Content-Length field". + */ + apr_table_unset(r->headers_in, "Content-Length"); + } + } + + apr_brigade_destroy(tmp_bb); + + /* update what we think the virtual host is based on the headers we've + * now read. may update status. + */ + ap_update_vhost_from_headers(r); + access_status = r->status; + + /* Toggle to the Host:-based vhost's timeout mode to fetch the + * request body and send the response body, if needed. + */ + if (cur_timeout != r->server->timeout) { + apr_socket_timeout_set(csd, r->server->timeout); + cur_timeout = r->server->timeout; + } + + /* we may have switched to another server */ + r->per_dir_config = r->server->lookup_defaults; + + if ((!r->hostname && (r->proto_num >= HTTP_VERSION(1, 1))) + || ((r->proto_num == HTTP_VERSION(1, 1)) + && !apr_table_get(r->headers_in, "Host"))) { + /* + * Client sent us an HTTP/1.1 or later request without telling us the + * hostname, either with a full URL or a Host: header. We therefore + * need to (as per the 1.1 spec) send an error. As a special case, + * HTTP/1.1 mentions twice (S9, S14.23) that a request MUST contain + * a Host: header, and the server MUST respond with 400 if it doesn't. + */ + access_status = HTTP_BAD_REQUEST; + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00569) + "client sent HTTP/1.1 request without hostname " + "(see RFC2616 section 14.23): %s", r->uri); + } + + /* + * Add the HTTP_IN filter here to ensure that ap_discard_request_body + * called by ap_die and by ap_send_error_response works correctly on + * status codes that do not cause the connection to be dropped and + * in situations where the connection should be kept alive. + */ + + ap_add_input_filter_handle(ap_http_input_filter_handle, + NULL, r, r->connection); + + if (access_status != HTTP_OK + || (access_status = ap_run_post_read_request(r))) { + ap_die(access_status, r); + ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); + ap_run_log_transaction(r); + r = NULL; + goto traceout; + } + + if (((expect = apr_table_get(r->headers_in, "Expect")) != NULL) + && (expect[0] != '\0')) { + /* + * The Expect header field was added to HTTP/1.1 after RFC 2068 + * as a means to signal when a 100 response is desired and, + * unfortunately, to signal a poor man's mandatory extension that + * the server must understand or return 417 Expectation Failed. + */ + if (strcasecmp(expect, "100-continue") == 0) { + r->expecting_100 = 1; + } + else { + r->status = HTTP_EXPECTATION_FAILED; + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00570) + "client sent an unrecognized expectation value of " + "Expect: %s", expect); + ap_send_error_response(r, 0); + ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r); + ap_run_log_transaction(r); + goto traceout; + } + } + + AP_READ_REQUEST_SUCCESS((uintptr_t)r, (char *)r->method, (char *)r->uri, (char *)r->server->defn_name, r->status); + return r; + traceout: + AP_READ_REQUEST_FAILURE((uintptr_t)r); + return r; +} + +/* if a request with a body creates a subrequest, remove original request's + * input headers which pertain to the body which has already been read. + * out-of-line helper function for ap_set_sub_req_protocol. + */ + +static void strip_headers_request_body(request_rec *rnew) +{ + apr_table_unset(rnew->headers_in, "Content-Encoding"); + apr_table_unset(rnew->headers_in, "Content-Language"); + apr_table_unset(rnew->headers_in, "Content-Length"); + apr_table_unset(rnew->headers_in, "Content-Location"); + apr_table_unset(rnew->headers_in, "Content-MD5"); + apr_table_unset(rnew->headers_in, "Content-Range"); + apr_table_unset(rnew->headers_in, "Content-Type"); + apr_table_unset(rnew->headers_in, "Expires"); + apr_table_unset(rnew->headers_in, "Last-Modified"); + apr_table_unset(rnew->headers_in, "Transfer-Encoding"); +} + +/* + * A couple of other functions which initialize some of the fields of + * a request structure, as appropriate for adjuncts of one kind or another + * to a request in progress. Best here, rather than elsewhere, since + * *someone* has to set the protocol-specific fields... + */ + +AP_DECLARE(void) ap_set_sub_req_protocol(request_rec *rnew, + const request_rec *r) +{ + rnew->the_request = r->the_request; /* Keep original request-line */ + + rnew->assbackwards = 1; /* Don't send headers from this. */ + rnew->no_local_copy = 1; /* Don't try to send HTTP_NOT_MODIFIED for a + * fragment. */ + rnew->method = "GET"; + rnew->method_number = M_GET; + rnew->protocol = "INCLUDED"; + + rnew->status = HTTP_OK; + + rnew->headers_in = apr_table_copy(rnew->pool, r->headers_in); + rnew->trailers_in = apr_table_copy(rnew->pool, r->trailers_in); + + /* did the original request have a body? (e.g. POST w/SSI tags) + * if so, make sure the subrequest doesn't inherit body headers + */ + if (!r->kept_body && (apr_table_get(r->headers_in, "Content-Length") + || apr_table_get(r->headers_in, "Transfer-Encoding"))) { + strip_headers_request_body(rnew); + } + rnew->subprocess_env = apr_table_copy(rnew->pool, r->subprocess_env); + rnew->headers_out = apr_table_make(rnew->pool, 5); + rnew->err_headers_out = apr_table_make(rnew->pool, 5); + rnew->trailers_out = apr_table_make(rnew->pool, 5); + rnew->notes = apr_table_make(rnew->pool, 5); + + rnew->expecting_100 = r->expecting_100; + rnew->read_length = r->read_length; + rnew->read_body = REQUEST_NO_BODY; + + rnew->main = (request_rec *) r; +} + +static void end_output_stream(request_rec *r) +{ + conn_rec *c = r->connection; + apr_bucket_brigade *bb; + apr_bucket *b; + + bb = apr_brigade_create(r->pool, c->bucket_alloc); + b = apr_bucket_eos_create(c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(bb, b); + ap_pass_brigade(r->output_filters, bb); +} + +AP_DECLARE(void) ap_finalize_sub_req_protocol(request_rec *sub) +{ + /* tell the filter chain there is no more content coming */ + if (!sub->eos_sent) { + end_output_stream(sub); + } +} + +/* finalize_request_protocol is called at completion of sending the + * response. Its sole purpose is to send the terminating protocol + * information for any wrappers around the response message body + * (i.e., transfer encodings). It should have been named finalize_response. + */ +AP_DECLARE(void) ap_finalize_request_protocol(request_rec *r) +{ + (void) ap_discard_request_body(r); + + /* tell the filter chain there is no more content coming */ + if (!r->eos_sent) { + end_output_stream(r); + } +} + +/* + * Support for the Basic authentication protocol, and a bit for Digest. + */ +AP_DECLARE(void) ap_note_auth_failure(request_rec *r) +{ + const char *type = ap_auth_type(r); + if (type) { + ap_run_note_auth_failure(r, type); + } + else { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00571) + "need AuthType to note auth failure: %s", r->uri); + } +} + +AP_DECLARE(void) ap_note_basic_auth_failure(request_rec *r) +{ + ap_note_auth_failure(r); +} + +AP_DECLARE(void) ap_note_digest_auth_failure(request_rec *r) +{ + ap_note_auth_failure(r); +} + +AP_DECLARE(int) ap_get_basic_auth_pw(request_rec *r, const char **pw) +{ + const char *auth_line = apr_table_get(r->headers_in, + (PROXYREQ_PROXY == r->proxyreq) + ? "Proxy-Authorization" + : "Authorization"); + const char *t; + + if (!(t = ap_auth_type(r)) || strcasecmp(t, "Basic")) + return DECLINED; + + if (!ap_auth_name(r)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00572) + "need AuthName: %s", r->uri); + return HTTP_INTERNAL_SERVER_ERROR; + } + + if (!auth_line) { + ap_note_auth_failure(r); + return HTTP_UNAUTHORIZED; + } + + if (strcasecmp(ap_getword(r->pool, &auth_line, ' '), "Basic")) { + /* Client tried to authenticate using wrong auth scheme */ + ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00573) + "client used wrong authentication scheme: %s", r->uri); + ap_note_auth_failure(r); + return HTTP_UNAUTHORIZED; + } + + while (*auth_line == ' ' || *auth_line == '\t') { + auth_line++; + } + + t = ap_pbase64decode(r->pool, auth_line); + r->user = ap_getword_nulls (r->pool, &t, ':'); + apr_table_setn(r->notes, AP_GET_BASIC_AUTH_PW_NOTE, "1"); + r->ap_auth_type = "Basic"; + + *pw = t; + + return OK; +} + +AP_DECLARE(apr_status_t) ap_get_basic_auth_components(const request_rec *r, + const char **username, + const char **password) +{ + const char *auth_header; + const char *credentials; + const char *decoded; + const char *user; + + auth_header = (PROXYREQ_PROXY == r->proxyreq) ? "Proxy-Authorization" + : "Authorization"; + credentials = apr_table_get(r->headers_in, auth_header); + + if (!credentials) { + /* No auth header. */ + return APR_EINVAL; + } + + if (ap_cstr_casecmp(ap_getword(r->pool, &credentials, ' '), "Basic")) { + /* These aren't Basic credentials. */ + return APR_EINVAL; + } + + while (*credentials == ' ' || *credentials == '\t') { + credentials++; + } + + /* XXX Our base64 decoding functions don't actually error out if the string + * we give it isn't base64; they'll just silently stop and hand us whatever + * they've parsed up to that point. + * + * Since this function is supposed to be a drop-in replacement for the + * deprecated ap_get_basic_auth_pw(), don't fix this for 2.4.x. + */ + decoded = ap_pbase64decode(r->pool, credentials); + user = ap_getword_nulls(r->pool, &decoded, ':'); + + if (username) { + *username = user; + } + if (password) { + *password = decoded; + } + + return APR_SUCCESS; +} + +struct content_length_ctx { + int data_sent; /* true if the C-L filter has already sent at + * least one bucket on to the next output filter + * for this request + */ + apr_bucket_brigade *tmpbb; +}; + +/* This filter computes the content length, but it also computes the number + * of bytes sent to the client. This means that this filter will always run + * through all of the buckets in all brigades + */ +AP_CORE_DECLARE_NONSTD(apr_status_t) ap_content_length_filter( + ap_filter_t *f, + apr_bucket_brigade *b) +{ + request_rec *r = f->r; + struct content_length_ctx *ctx; + apr_bucket *e; + int eos = 0; + apr_read_type_e eblock = APR_NONBLOCK_READ; + + ctx = f->ctx; + if (!ctx) { + f->ctx = ctx = apr_palloc(r->pool, sizeof(*ctx)); + ctx->data_sent = 0; + ctx->tmpbb = apr_brigade_create(r->pool, r->connection->bucket_alloc); + } + + /* Loop through the brigade to count the length. To avoid + * arbitrary memory consumption with morphing bucket types, this + * loop will stop and pass on the brigade when necessary. */ + e = APR_BRIGADE_FIRST(b); + while (e != APR_BRIGADE_SENTINEL(b)) { + apr_status_t rv; + + if (APR_BUCKET_IS_EOS(e)) { + eos = 1; + break; + } + /* For a flush bucket, fall through to pass the brigade and + * flush now. */ + else if (APR_BUCKET_IS_FLUSH(e)) { + e = APR_BUCKET_NEXT(e); + } + /* For metadata bucket types other than FLUSH, loop. */ + else if (APR_BUCKET_IS_METADATA(e)) { + e = APR_BUCKET_NEXT(e); + continue; + } + /* For determinate length data buckets, count the length and + * continue. */ + else if (e->length != (apr_size_t)-1) { + r->bytes_sent += e->length; + e = APR_BUCKET_NEXT(e); + continue; + } + /* For indeterminate length data buckets, perform one read. */ + else /* e->length == (apr_size_t)-1 */ { + apr_size_t len; + const char *ignored; + + rv = apr_bucket_read(e, &ignored, &len, eblock); + if ((rv != APR_SUCCESS) && !APR_STATUS_IS_EAGAIN(rv)) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00574) + "ap_content_length_filter: " + "apr_bucket_read() failed"); + return rv; + } + if (rv == APR_SUCCESS) { + eblock = APR_NONBLOCK_READ; + e = APR_BUCKET_NEXT(e); + r->bytes_sent += len; + } + else if (APR_STATUS_IS_EAGAIN(rv)) { + apr_bucket *flush; + + /* Next read must block. */ + eblock = APR_BLOCK_READ; + + /* Ensure the last bucket to pass down is a flush if + * the next read will block. */ + flush = apr_bucket_flush_create(f->c->bucket_alloc); + APR_BUCKET_INSERT_BEFORE(e, flush); + } + } + + /* Optimization: if the next bucket is EOS (directly after a + * bucket morphed to the heap, or a flush), short-cut to + * handle EOS straight away - allowing C-L to be determined + * for content which is already entirely in memory. */ + if (e != APR_BRIGADE_SENTINEL(b) && APR_BUCKET_IS_EOS(e)) { + continue; + } + + /* On reaching here, pass on everything in the brigade up to + * this point. */ + apr_brigade_split_ex(b, e, ctx->tmpbb); + + rv = ap_pass_brigade(f->next, b); + if (rv != APR_SUCCESS) { + return rv; + } + else if (f->c->aborted) { + return APR_ECONNABORTED; + } + apr_brigade_cleanup(b); + APR_BRIGADE_CONCAT(b, ctx->tmpbb); + e = APR_BRIGADE_FIRST(b); + + ctx->data_sent = 1; + } + + /* If we've now seen the entire response and it's otherwise + * okay to set the C-L in the response header, then do so now. + * + * We can only set a C-L in the response header if we haven't already + * sent any buckets on to the next output filter for this request. + */ + if (ctx->data_sent == 0 && eos && + /* don't whack the C-L if it has already been set for a HEAD + * by something like proxy. the brigade only has an EOS bucket + * in this case, making r->bytes_sent zero. + * + * if r->bytes_sent > 0 we have a (temporary) body whose length may + * have been changed by a filter. the C-L header might not have been + * updated so we do it here. long term it would be cleaner to have + * such filters update or remove the C-L header, and just use it + * if present. + */ + !((r->header_only || AP_STATUS_IS_HEADER_ONLY(r->status)) && r->bytes_sent == 0 && + apr_table_get(r->headers_out, "Content-Length"))) { + ap_set_content_length(r, r->bytes_sent); + } + + ctx->data_sent = 1; + return ap_pass_brigade(f->next, b); +} + +/* + * Send the body of a response to the client. + */ +AP_DECLARE(apr_status_t) ap_send_fd(apr_file_t *fd, request_rec *r, + apr_off_t offset, apr_size_t len, + apr_size_t *nbytes) +{ + conn_rec *c = r->connection; + apr_bucket_brigade *bb = NULL; + apr_status_t rv; + + bb = apr_brigade_create(r->pool, c->bucket_alloc); + + apr_brigade_insert_file(bb, fd, offset, len, r->pool); + + rv = ap_pass_brigade(r->output_filters, bb); + if (rv != APR_SUCCESS) { + *nbytes = 0; /* no way to tell how many were actually sent */ + } + else { + *nbytes = len; + } + + return rv; +} + +#if APR_HAS_MMAP +/* send data from an in-memory buffer */ +AP_DECLARE(apr_size_t) ap_send_mmap(apr_mmap_t *mm, + request_rec *r, + apr_size_t offset, + apr_size_t length) +{ + conn_rec *c = r->connection; + apr_bucket_brigade *bb = NULL; + apr_bucket *b; + + bb = apr_brigade_create(r->pool, c->bucket_alloc); + b = apr_bucket_mmap_create(mm, offset, length, c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(bb, b); + ap_pass_brigade(r->output_filters, bb); + + return mm->size; /* XXX - change API to report apr_status_t? */ +} +#endif /* APR_HAS_MMAP */ + +typedef struct { + apr_bucket_brigade *bb; + apr_bucket_brigade *tmpbb; +} old_write_filter_ctx; + +AP_CORE_DECLARE_NONSTD(apr_status_t) ap_old_write_filter( + ap_filter_t *f, apr_bucket_brigade *bb) +{ + old_write_filter_ctx *ctx = f->ctx; + + AP_DEBUG_ASSERT(ctx); + + if (ctx->bb != NULL) { + /* whatever is coming down the pipe (we don't care), we + * can simply insert our buffered data at the front and + * pass the whole bundle down the chain. + */ + APR_BRIGADE_PREPEND(bb, ctx->bb); + } + + return ap_pass_brigade(f->next, bb); +} + +static ap_filter_t *insert_old_write_filter(request_rec *r) +{ + ap_filter_t *f; + old_write_filter_ctx *ctx; + + /* future optimization: record some flags in the request_rec to + * say whether we've added our filter, and whether it is first. + */ + + /* this will typically exit on the first test */ + for (f = r->output_filters; f != NULL; f = f->next) { + if (ap_old_write_func == f->frec) + break; + } + + if (f == NULL) { + /* our filter hasn't been added yet */ + ctx = apr_pcalloc(r->pool, sizeof(*ctx)); + ctx->tmpbb = apr_brigade_create(r->pool, r->connection->bucket_alloc); + + ap_add_output_filter("OLD_WRITE", ctx, r, r->connection); + f = r->output_filters; + } + + return f; +} + +static apr_status_t buffer_output(request_rec *r, + const char *str, apr_size_t len) +{ + conn_rec *c = r->connection; + ap_filter_t *f; + old_write_filter_ctx *ctx; + + if (len == 0) + return APR_SUCCESS; + + f = insert_old_write_filter(r); + ctx = f->ctx; + + /* if the first filter is not our buffering filter, then we have to + * deliver the content through the normal filter chain + */ + if (f != r->output_filters) { + apr_status_t rv; + apr_bucket *b = apr_bucket_transient_create(str, len, c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(ctx->tmpbb, b); + + rv = ap_pass_brigade(r->output_filters, ctx->tmpbb); + apr_brigade_cleanup(ctx->tmpbb); + return rv; + } + + if (ctx->bb == NULL) { + ctx->bb = apr_brigade_create(r->pool, c->bucket_alloc); + } + + return ap_fwrite(f->next, ctx->bb, str, len); +} + +AP_DECLARE(int) ap_rputc(int c, request_rec *r) +{ + char c2 = (char)c; + + if (r->connection->aborted) { + return -1; + } + + if (buffer_output(r, &c2, 1) != APR_SUCCESS) + return -1; + + return c; +} + +AP_DECLARE(int) ap_rwrite(const void *buf, int nbyte, request_rec *r) +{ + if (r->connection->aborted) + return -1; + + if (buffer_output(r, buf, nbyte) != APR_SUCCESS) + return -1; + + return nbyte; +} + +struct ap_vrprintf_data { + apr_vformatter_buff_t vbuff; + request_rec *r; + char *buff; +}; + +/* Flush callback for apr_vformatter; returns -1 on error. */ +static int r_flush(apr_vformatter_buff_t *buff) +{ + /* callback function passed to ap_vformatter to be called when + * vformatter needs to write into buff and buff.curpos > buff.endpos */ + + /* ap_vrprintf_data passed as a apr_vformatter_buff_t, which is then + * "downcast" to an ap_vrprintf_data */ + struct ap_vrprintf_data *vd = (struct ap_vrprintf_data*)buff; + + if (vd->r->connection->aborted) + return -1; + + /* r_flush is called when vbuff is completely full */ + if (buffer_output(vd->r, vd->buff, AP_IOBUFSIZE)) { + return -1; + } + + /* reset the buffer position */ + vd->vbuff.curpos = vd->buff; + vd->vbuff.endpos = vd->buff + AP_IOBUFSIZE; + + return 0; +} + +AP_DECLARE(int) ap_vrprintf(request_rec *r, const char *fmt, va_list va) +{ + apr_size_t written; + struct ap_vrprintf_data vd; + char vrprintf_buf[AP_IOBUFSIZE]; + + vd.vbuff.curpos = vrprintf_buf; + vd.vbuff.endpos = vrprintf_buf + AP_IOBUFSIZE; + vd.r = r; + vd.buff = vrprintf_buf; + + if (r->connection->aborted) + return -1; + + written = apr_vformatter(r_flush, &vd.vbuff, fmt, va); + + if (written != -1) { + int n = vd.vbuff.curpos - vrprintf_buf; + + /* last call to buffer_output, to finish clearing the buffer */ + if (buffer_output(r, vrprintf_buf,n) != APR_SUCCESS) + return -1; + + written += n; + } + + return written; +} + +AP_DECLARE_NONSTD(int) ap_rprintf(request_rec *r, const char *fmt, ...) +{ + va_list va; + int n; + + if (r->connection->aborted) + return -1; + + va_start(va, fmt); + n = ap_vrprintf(r, fmt, va); + va_end(va); + + return n; +} + +AP_DECLARE_NONSTD(int) ap_rvputs(request_rec *r, ...) +{ + va_list va; + const char *s; + apr_size_t len; + apr_size_t written = 0; + + if (r->connection->aborted) + return -1; + + /* ### TODO: if the total output is large, put all the strings + * ### into a single brigade, rather than flushing each time we + * ### fill the buffer + */ + va_start(va, r); + while (1) { + s = va_arg(va, const char *); + if (s == NULL) + break; + + len = strlen(s); + if (buffer_output(r, s, len) != APR_SUCCESS) { + return -1; + } + + written += len; + } + va_end(va); + + return written; +} + +AP_DECLARE(int) ap_rflush(request_rec *r) +{ + conn_rec *c = r->connection; + apr_bucket *b; + ap_filter_t *f; + old_write_filter_ctx *ctx; + apr_status_t rv; + + f = insert_old_write_filter(r); + ctx = f->ctx; + + b = apr_bucket_flush_create(c->bucket_alloc); + APR_BRIGADE_INSERT_TAIL(ctx->tmpbb, b); + + rv = ap_pass_brigade(r->output_filters, ctx->tmpbb); + apr_brigade_cleanup(ctx->tmpbb); + if (rv != APR_SUCCESS) + return -1; + + return 0; +} + +/* + * This function sets the Last-Modified output header field to the value + * of the mtime field in the request structure - rationalized to keep it from + * being in the future. + */ +AP_DECLARE(void) ap_set_last_modified(request_rec *r) +{ + if (!r->assbackwards) { + apr_time_t mod_time = ap_rationalize_mtime(r, r->mtime); + char *datestr = apr_palloc(r->pool, APR_RFC822_DATE_LEN); + + apr_rfc822_date(datestr, mod_time); + apr_table_setn(r->headers_out, "Last-Modified", datestr); + } +} + +typedef struct hdr_ptr { + ap_filter_t *f; + apr_bucket_brigade *bb; +} hdr_ptr; + +#if APR_CHARSET_EBCDIC +static int send_header(void *data, const char *key, const char *val) +{ + char *header_line = NULL; + hdr_ptr *hdr = (hdr_ptr*)data; + + header_line = apr_pstrcat(hdr->bb->p, key, ": ", val, CRLF, NULL); + ap_xlate_proto_to_ascii(header_line, strlen(header_line)); + ap_fputs(hdr->f, hdr->bb, header_line); + return 1; +} +#else +static int send_header(void *data, const char *key, const char *val) +{ + ap_fputstrs(((hdr_ptr*)data)->f, ((hdr_ptr*)data)->bb, + key, ": ", val, CRLF, NULL); + return 1; + } +#endif + +AP_DECLARE(void) ap_send_interim_response(request_rec *r, int send_headers) +{ + hdr_ptr x; + char *status_line = NULL; + request_rec *rr; + + if (r->proto_num < HTTP_VERSION(1,1)) { + /* don't send interim response to HTTP/1.0 Client */ + return; + } + if (!ap_is_HTTP_INFO(r->status)) { + ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00575) + "Status is %d - not sending interim response", r->status); + return; + } + if ((r->status == HTTP_CONTINUE) && !r->expecting_100) { + /* + * Don't send 100-Continue when there was no Expect: 100-continue + * in the request headers. For origin servers this is a SHOULD NOT + * for proxies it is a MUST NOT according to RFC 2616 8.2.3 + */ + return; + } + + /* if we send an interim response, we're no longer in a state of + * expecting one. Also, this could feasibly be in a subrequest, + * so we need to propagate the fact that we responded. + */ + for (rr = r; rr != NULL; rr = rr->main) { + rr->expecting_100 = 0; + } + + status_line = apr_pstrcat(r->pool, AP_SERVER_PROTOCOL, " ", r->status_line, CRLF, NULL); + ap_xlate_proto_to_ascii(status_line, strlen(status_line)); + + x.f = r->connection->output_filters; + x.bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); + + ap_fputs(x.f, x.bb, status_line); + if (send_headers) { + apr_table_do(send_header, &x, r->headers_out, NULL); + apr_table_clear(r->headers_out); + } + ap_fputs(x.f, x.bb, CRLF_ASCII); + ap_fflush(x.f, x.bb); + apr_brigade_destroy(x.bb); +} + +/* + * Compare two protocol identifier. Result is similar to strcmp(): + * 0 gives same precedence, >0 means proto1 is preferred. + */ +static int protocol_cmp(const apr_array_header_t *preferences, + const char *proto1, + const char *proto2) +{ + if (preferences && preferences->nelts > 0) { + int index1 = ap_array_str_index(preferences, proto1, 0); + int index2 = ap_array_str_index(preferences, proto2, 0); + if (index2 > index1) { + return (index1 >= 0) ? 1 : -1; + } + else if (index1 > index2) { + return (index2 >= 0) ? -1 : 1; + } + } + /* both have the same index (mabye -1 or no pref configured) and we compare + * the names so that spdy3 gets precedence over spdy2. That makes + * the outcome at least deterministic. */ + return strcmp(proto1, proto2); +} + +AP_DECLARE(const char *) ap_get_protocol(conn_rec *c) +{ + const char *protocol = ap_run_protocol_get(c); + return protocol? protocol : AP_PROTOCOL_HTTP1; +} + +AP_DECLARE(apr_status_t) ap_get_protocol_upgrades(conn_rec *c, request_rec *r, + server_rec *s, int report_all, + const apr_array_header_t **pupgrades) +{ + apr_pool_t *pool = r? r->pool : c->pool; + core_server_config *conf; + const char *existing; + apr_array_header_t *upgrades = NULL; + + if (!s) { + s = (r? r->server : c->base_server); + } + conf = ap_get_core_module_config(s->module_config); + + if (conf->protocols->nelts > 0) { + existing = ap_get_protocol(c); + if (conf->protocols->nelts > 1 + || !ap_array_str_contains(conf->protocols, existing)) { + int i; + + /* possibly more than one choice or one, but not the + * existing. (TODO: maybe 426 and Upgrade then?) */ + upgrades = apr_array_make(pool, conf->protocols->nelts + 1, + sizeof(char *)); + for (i = 0; i < conf->protocols->nelts; i++) { + const char *p = APR_ARRAY_IDX(conf->protocols, i, char *); + if (strcmp(existing, p)) { + /* not the one we have and possible, add in this order */ + APR_ARRAY_PUSH(upgrades, const char*) = p; + } + else if (!report_all) { + break; + } + } + } + } + + *pupgrades = upgrades; + return APR_SUCCESS; +} + +AP_DECLARE(const char *) ap_select_protocol(conn_rec *c, request_rec *r, + server_rec *s, + const apr_array_header_t *choices) +{ + apr_pool_t *pool = r? r->pool : c->pool; + core_server_config *conf; + const char *protocol = NULL, *existing; + apr_array_header_t *proposals; + + if (!s) { + s = (r? r->server : c->base_server); + } + conf = ap_get_core_module_config(s->module_config); + + if (APLOGcdebug(c)) { + const char *p = apr_array_pstrcat(pool, conf->protocols, ','); + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03155) + "select protocol from %s, choices=%s for server %s", + p, apr_array_pstrcat(pool, choices, ','), + s->server_hostname); + } + + if (conf->protocols->nelts <= 0) { + /* nothing configured, by default, we only allow http/1.1 here. + * For now... + */ + if (ap_array_str_contains(choices, AP_PROTOCOL_HTTP1)) { + return AP_PROTOCOL_HTTP1; + } + else { + return NULL; + } + } + + proposals = apr_array_make(pool, choices->nelts + 1, sizeof(char *)); + ap_run_protocol_propose(c, r, s, choices, proposals); + + /* If the existing protocol has not been proposed, but is a choice, + * add it to the proposals implicitly. + */ + existing = ap_get_protocol(c); + if (!ap_array_str_contains(proposals, existing) + && ap_array_str_contains(choices, existing)) { + APR_ARRAY_PUSH(proposals, const char*) = existing; + } + + if (proposals->nelts > 0) { + int i; + const apr_array_header_t *prefs = NULL; + + /* Default for protocols_honor_order is 'on' or != 0 */ + if (conf->protocols_honor_order == 0 && choices->nelts > 0) { + prefs = choices; + } + else { + prefs = conf->protocols; + } + + /* Select the most preferred protocol */ + if (APLOGcdebug(c)) { + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03156) + "select protocol, proposals=%s preferences=%s configured=%s", + apr_array_pstrcat(pool, proposals, ','), + apr_array_pstrcat(pool, prefs, ','), + apr_array_pstrcat(pool, conf->protocols, ',')); + } + for (i = 0; i < proposals->nelts; ++i) { + const char *p = APR_ARRAY_IDX(proposals, i, const char *); + if (!ap_array_str_contains(conf->protocols, p)) { + /* not a configured protocol here */ + continue; + } + else if (!protocol + || (protocol_cmp(prefs, protocol, p) < 0)) { + /* none selected yet or this one has preference */ + protocol = p; + } + } + } + if (APLOGcdebug(c)) { + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(03157) + "selected protocol=%s", + protocol? protocol : "(none)"); + } + + return protocol; +} + +AP_DECLARE(apr_status_t) ap_switch_protocol(conn_rec *c, request_rec *r, + server_rec *s, + const char *protocol) +{ + const char *current = ap_get_protocol(c); + int rc; + + if (!strcmp(current, protocol)) { + ap_log_cerror(APLOG_MARK, APLOG_WARNING, 0, c, APLOGNO(02906) + "already at it, protocol_switch to %s", + protocol); + return APR_SUCCESS; + } + + rc = ap_run_protocol_switch(c, r, s, protocol); + switch (rc) { + case DECLINED: + ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02907) + "no implementation for protocol_switch to %s", + protocol); + return APR_ENOTIMPL; + case OK: + case DONE: + return APR_SUCCESS; + default: + ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(02905) + "unexpected return code %d from protocol_switch to %s" + , rc, protocol); + return APR_EOF; + } +} + +AP_DECLARE(int) ap_is_allowed_protocol(conn_rec *c, request_rec *r, + server_rec *s, const char *protocol) +{ + core_server_config *conf; + + if (!s) { + s = (r? r->server : c->base_server); + } + conf = ap_get_core_module_config(s->module_config); + + if (conf->protocols->nelts > 0) { + return ap_array_str_contains(conf->protocols, protocol); + } + return !strcmp(AP_PROTOCOL_HTTP1, protocol); +} + + +AP_IMPLEMENT_HOOK_VOID(pre_read_request, + (request_rec *r, conn_rec *c), + (r, c)) +AP_IMPLEMENT_HOOK_RUN_ALL(int,post_read_request, + (request_rec *r), (r), OK, DECLINED) +AP_IMPLEMENT_HOOK_RUN_ALL(int,log_transaction, + (request_rec *r), (r), OK, DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(const char *,http_scheme, + (const request_rec *r), (r), NULL) +AP_IMPLEMENT_HOOK_RUN_FIRST(unsigned short,default_port, + (const request_rec *r), (r), 0) +AP_IMPLEMENT_HOOK_RUN_FIRST(int, note_auth_failure, + (request_rec *r, const char *auth_type), + (r, auth_type), DECLINED) +AP_IMPLEMENT_HOOK_RUN_ALL(int,protocol_propose, + (conn_rec *c, request_rec *r, server_rec *s, + const apr_array_header_t *offers, + apr_array_header_t *proposals), + (c, r, s, offers, proposals), OK, DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(int,protocol_switch, + (conn_rec *c, request_rec *r, server_rec *s, + const char *protocol), + (c, r, s, protocol), DECLINED) +AP_IMPLEMENT_HOOK_RUN_FIRST(const char *,protocol_get, + (const conn_rec *c), (c), NULL) |