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Diffstat (limited to 'server/listen.c')
| -rw-r--r-- | server/listen.c | 938 |
1 files changed, 938 insertions, 0 deletions
diff --git a/server/listen.c b/server/listen.c new file mode 100644 index 0000000..a8e9e6f --- /dev/null +++ b/server/listen.c @@ -0,0 +1,938 @@ +/* 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. + */ + +#include "apr_network_io.h" +#include "apr_strings.h" + +#define APR_WANT_STRFUNC +#include "apr_want.h" + +#include "ap_config.h" +#include "httpd.h" +#include "http_main.h" +#include "http_config.h" +#include "http_core.h" +#include "ap_listen.h" +#include "http_log.h" +#include "mpm_common.h" + +#include <stdlib.h> +#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 + +AP_DECLARE_DATA ap_listen_rec *ap_listeners = NULL; + +/* Let ap_num_listen_buckets be global so that it can + * be printed by ap_log_mpm_common(), but keep the listeners + * buckets static since it is used only here to close them + * all (including duplicated) with ap_close_listeners(). + */ +AP_DECLARE_DATA int ap_num_listen_buckets; +static ap_listen_rec **ap_listen_buckets; + +/* Determine once, at runtime, whether or not SO_REUSEPORT + * is usable on this platform, and hence whether or not + * listeners can be duplicated (if configured). + */ +AP_DECLARE_DATA int ap_have_so_reuseport = -1; + +static ap_listen_rec *old_listeners; +static int ap_listenbacklog; +static int ap_listencbratio; +static int send_buffer_size; +static int receive_buffer_size; + +/* TODO: make_sock is just begging and screaming for APR abstraction */ +static apr_status_t make_sock(apr_pool_t *p, ap_listen_rec *server) +{ + apr_socket_t *s = server->sd; + int one = 1; +#if APR_HAVE_IPV6 +#ifdef AP_ENABLE_V4_MAPPED + int v6only_setting = 0; +#else + int v6only_setting = 1; +#endif +#endif + apr_status_t stat; + +#ifndef WIN32 + stat = apr_socket_opt_set(s, APR_SO_REUSEADDR, one); + if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, stat, p, APLOGNO(00067) + "make_sock: for address %pI, apr_socket_opt_set: (SO_REUSEADDR)", + server->bind_addr); + apr_socket_close(s); + return stat; + } +#endif + + stat = apr_socket_opt_set(s, APR_SO_KEEPALIVE, one); + if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, stat, p, APLOGNO(00068) + "make_sock: for address %pI, apr_socket_opt_set: (SO_KEEPALIVE)", + server->bind_addr); + apr_socket_close(s); + return stat; + } + +#if APR_HAVE_IPV6 + if (server->bind_addr->family == APR_INET6) { + stat = apr_socket_opt_set(s, APR_IPV6_V6ONLY, v6only_setting); + if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, stat, p, APLOGNO(00069) + "make_sock: for address %pI, apr_socket_opt_set: " + "(IPV6_V6ONLY)", + server->bind_addr); + apr_socket_close(s); + return stat; + } + } +#endif + + /* + * To send data over high bandwidth-delay connections at full + * speed we must force the TCP window to open wide enough to keep the + * pipe full. The default window size on many systems + * is only 4kB. Cross-country WAN connections of 100ms + * at 1Mb/s are not impossible for well connected sites. + * If we assume 100ms cross-country latency, + * a 4kB buffer limits throughput to 40kB/s. + * + * To avoid this problem I've added the SendBufferSize directive + * to allow the web master to configure send buffer size. + * + * The trade-off of larger buffers is that more kernel memory + * is consumed. YMMV, know your customers and your network! + * + * -John Heidemann <johnh@isi.edu> 25-Oct-96 + * + * If no size is specified, use the kernel default. + */ + if (send_buffer_size) { + stat = apr_socket_opt_set(s, APR_SO_SNDBUF, send_buffer_size); + if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) { + ap_log_perror(APLOG_MARK, APLOG_WARNING, stat, p, APLOGNO(00070) + "make_sock: failed to set SendBufferSize for " + "address %pI, using default", + server->bind_addr); + /* not a fatal error */ + } + } + if (receive_buffer_size) { + stat = apr_socket_opt_set(s, APR_SO_RCVBUF, receive_buffer_size); + if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) { + ap_log_perror(APLOG_MARK, APLOG_WARNING, stat, p, APLOGNO(00071) + "make_sock: failed to set ReceiveBufferSize for " + "address %pI, using default", + server->bind_addr); + /* not a fatal error */ + } + } + +#if APR_TCP_NODELAY_INHERITED + ap_sock_disable_nagle(s); +#endif + +#if defined(SO_REUSEPORT) + if (ap_have_so_reuseport && ap_listencbratio > 0) { + int thesock; + apr_os_sock_get(&thesock, s); + if (setsockopt(thesock, SOL_SOCKET, SO_REUSEPORT, + (void *)&one, sizeof(int)) < 0) { + stat = apr_get_netos_error(); + ap_log_perror(APLOG_MARK, APLOG_CRIT, stat, p, APLOGNO(02638) + "make_sock: for address %pI, apr_socket_opt_set: " + "(SO_REUSEPORT)", + server->bind_addr); + apr_socket_close(s); + return stat; + } + } +#endif + + if ((stat = apr_socket_bind(s, server->bind_addr)) != APR_SUCCESS) { + ap_log_perror(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT, stat, p, APLOGNO(00072) + "make_sock: could not bind to address %pI", + server->bind_addr); + apr_socket_close(s); + return stat; + } + + if ((stat = apr_socket_listen(s, ap_listenbacklog)) != APR_SUCCESS) { + ap_log_perror(APLOG_MARK, APLOG_STARTUP|APLOG_ERR, stat, p, APLOGNO(00073) + "make_sock: unable to listen for connections " + "on address %pI", + server->bind_addr); + apr_socket_close(s); + return stat; + } + +#ifdef WIN32 + /* I seriously doubt that this would work on Unix; I have doubts that + * it entirely solves the problem on Win32. However, since setting + * reuseaddr on the listener -prior- to binding the socket has allowed + * us to attach to the same port as an already running instance of + * Apache, or even another web server, we cannot identify that this + * port was exclusively granted to this instance of Apache. + * + * So set reuseaddr, but do not attempt to do so until we have the + * parent listeners successfully bound. + */ + stat = apr_socket_opt_set(s, APR_SO_REUSEADDR, one); + if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, stat, p, APLOGNO(00074) + "make_sock: for address %pI, apr_socket_opt_set: (SO_REUSEADDR)", + server->bind_addr); + apr_socket_close(s); + return stat; + } +#endif + + server->sd = s; + server->active = 1; + + server->accept_func = NULL; + + return APR_SUCCESS; +} + +static const char* find_accf_name(server_rec *s, const char *proto) +{ + const char* accf; + core_server_config *conf = ap_get_core_module_config(s->module_config); + if (!proto) { + return NULL; + } + + accf = apr_table_get(conf->accf_map, proto); + + if (accf && !strcmp("none", accf)) { + return NULL; + } + + return accf; +} + +static void ap_apply_accept_filter(apr_pool_t *p, ap_listen_rec *lis, + server_rec *server) +{ + apr_socket_t *s = lis->sd; + const char *accf; + apr_status_t rv; + const char *proto; + + proto = lis->protocol; + + if (!proto) { + proto = ap_get_server_protocol(server); + } + + + accf = find_accf_name(server, proto); + + if (accf) { +#if APR_HAS_SO_ACCEPTFILTER + /* In APR 1.x, the 2nd and 3rd parameters are char * instead of + * const char *, so make a copy of those args here. + */ + rv = apr_socket_accept_filter(s, apr_pstrdup(p, accf), + apr_pstrdup(p, "")); + if (rv != APR_SUCCESS && !APR_STATUS_IS_ENOTIMPL(rv)) { + ap_log_perror(APLOG_MARK, APLOG_WARNING, rv, p, APLOGNO(00075) + "Failed to enable the '%s' Accept Filter", + accf); + } +#else + rv = apr_socket_opt_set(s, APR_TCP_DEFER_ACCEPT, 30); + if (rv != APR_SUCCESS && !APR_STATUS_IS_ENOTIMPL(rv)) { + ap_log_perror(APLOG_MARK, APLOG_WARNING, rv, p, APLOGNO(00076) + "Failed to enable APR_TCP_DEFER_ACCEPT"); + } +#endif + } +} + +static apr_status_t close_listeners_on_exec(void *v) +{ + ap_close_listeners(); + return APR_SUCCESS; +} + +static int find_listeners(ap_listen_rec **from, ap_listen_rec **to, + const char *addr, apr_port_t port) +{ + int found = 0; + + while (*from) { + apr_sockaddr_t *sa = (*from)->bind_addr; + + /* Some listeners are not real so they will not have a bind_addr. */ + if (sa) { + ap_listen_rec *new; + apr_port_t oldport; + + oldport = sa->port; + /* If both ports are equivalent, then if their names are equivalent, + * then we will re-use the existing record. + */ + if (port == oldport && + ((!addr && !sa->hostname) || + ((addr && sa->hostname) && !strcmp(sa->hostname, addr)))) { + found = 1; + if (!to) { + break; + } + new = *from; + *from = new->next; + new->next = *to; + *to = new; + continue; + } + } + + from = &(*from)->next; + } + + return found; +} + +static const char *alloc_listener(process_rec *process, const char *addr, + apr_port_t port, const char* proto, + void *slave) +{ + ap_listen_rec *last; + apr_status_t status; + apr_sockaddr_t *sa; + + /* see if we've got a listener for this address:port, which is an error */ + if (find_listeners(&ap_listeners, NULL, addr, port)) { + return "Cannot define multiple Listeners on the same IP:port"; + } + + /* see if we've got an old listener for this address:port */ + if (find_listeners(&old_listeners, &ap_listeners, addr, port)) { + if (ap_listeners->slave != slave) { + return "Cannot define a slave on the same IP:port as a Listener"; + } + return NULL; + } + + if ((status = apr_sockaddr_info_get(&sa, addr, APR_UNSPEC, port, 0, + process->pool)) + != APR_SUCCESS) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, status, process->pool, APLOGNO(00077) + "alloc_listener: failed to set up sockaddr for %s", + addr); + return "Listen setup failed"; + } + + /* Initialize to our last configured ap_listener. */ + last = ap_listeners; + while (last && last->next) { + last = last->next; + } + + while (sa) { + ap_listen_rec *new; + + /* this has to survive restarts */ + new = apr_palloc(process->pool, sizeof(ap_listen_rec)); + new->active = 0; + new->next = 0; + new->bind_addr = sa; + new->protocol = apr_pstrdup(process->pool, proto); + + /* Go to the next sockaddr. */ + sa = sa->next; + + status = apr_socket_create(&new->sd, new->bind_addr->family, + SOCK_STREAM, 0, process->pool); + +#if APR_HAVE_IPV6 + /* What could happen is that we got an IPv6 address, but this system + * doesn't actually support IPv6. Try the next address. + */ + if (status != APR_SUCCESS && !addr && + new->bind_addr->family == APR_INET6) { + continue; + } +#endif + if (status != APR_SUCCESS) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, status, process->pool, APLOGNO(00078) + "alloc_listener: failed to get a socket for %s", + addr); + return "Listen setup failed"; + } + + /* We need to preserve the order returned by getaddrinfo() */ + if (last == NULL) { + ap_listeners = last = new; + } else { + last->next = new; + last = new; + } + new->slave = slave; + } + + return NULL; +} +/* Evaluates to true if the (apr_sockaddr_t *) addr argument is the + * IPv4 match-any-address, 0.0.0.0. */ +#define IS_INADDR_ANY(addr) ((addr)->family == APR_INET \ + && (addr)->sa.sin.sin_addr.s_addr == INADDR_ANY) + +/* Evaluates to true if the (apr_sockaddr_t *) addr argument is the + * IPv6 match-any-address, [::]. */ +#define IS_IN6ADDR_ANY(addr) ((addr)->family == APR_INET6 \ + && IN6_IS_ADDR_UNSPECIFIED(&(addr)->sa.sin6.sin6_addr)) + +/** + * Create, open, listen, and bind all sockets. + * @param process The process record for the currently running server + * @return The number of open sockets + */ +static int open_listeners(apr_pool_t *pool) +{ + ap_listen_rec *lr; + ap_listen_rec *next; + ap_listen_rec *previous; + int num_open; + const char *userdata_key = "ap_open_listeners"; + void *data; +#if AP_NONBLOCK_WHEN_MULTI_LISTEN + int use_nonblock; +#endif + + /* Don't allocate a default listener. If we need to listen to a + * port, then the user needs to have a Listen directive in their + * config file. + */ + num_open = 0; + previous = NULL; + for (lr = ap_listeners; lr; previous = lr, lr = lr->next) { + if (lr->active) { + ++num_open; + } + else { +#if APR_HAVE_IPV6 + ap_listen_rec *cur; + int v6only_setting; + int skip = 0; + + /* If we have the unspecified IPv4 address (0.0.0.0) and + * the unspecified IPv6 address (::) is next, we need to + * swap the order of these in the list. We always try to + * bind to IPv6 first, then IPv4, since an IPv6 socket + * might be able to receive IPv4 packets if V6ONLY is not + * enabled, but never the other way around. + * Note: In some configurations, the unspecified IPv6 address + * could be even later in the list. This logic only corrects + * the situation where it is next in the list, such as when + * apr_sockaddr_info_get() returns an IPv4 and an IPv6 address, + * in that order. + */ + if (lr->next != NULL + && IS_INADDR_ANY(lr->bind_addr) + && lr->bind_addr->port == lr->next->bind_addr->port + && IS_IN6ADDR_ANY(lr->next->bind_addr)) { + /* Exchange lr and lr->next */ + next = lr->next; + lr->next = next->next; + next->next = lr; + if (previous) { + previous->next = next; + } + else { + ap_listeners = next; + } + lr = next; + } + + /* If we are trying to bind to 0.0.0.0 and a previous listener + * was :: on the same port and in turn that socket does not have + * the IPV6_V6ONLY flag set; we must skip the current attempt to + * listen (which would generate an error). IPv4 will be handled + * on the established IPv6 socket. + */ + if (IS_INADDR_ANY(lr->bind_addr) && previous) { + for (cur = ap_listeners; cur != lr; cur = cur->next) { + if (lr->bind_addr->port == cur->bind_addr->port + && IS_IN6ADDR_ANY(cur->bind_addr) + && apr_socket_opt_get(cur->sd, APR_IPV6_V6ONLY, + &v6only_setting) == APR_SUCCESS + && v6only_setting == 0) { + + /* Remove the current listener from the list */ + previous->next = lr->next; + lr = previous; /* maintain current value of previous after + * post-loop expression is evaluated + */ + skip = 1; + break; + } + } + if (skip) { + continue; + } + } +#endif + if (make_sock(pool, lr) == APR_SUCCESS) { + ++num_open; + } + else { +#if APR_HAVE_IPV6 + /* If we tried to bind to ::, and the next listener is + * on 0.0.0.0 with the same port, don't give a fatal + * error. The user will still get a warning from make_sock + * though. + */ + if (lr->next != NULL + && IS_IN6ADDR_ANY(lr->bind_addr) + && lr->bind_addr->port == lr->next->bind_addr->port + && IS_INADDR_ANY(lr->next->bind_addr)) { + + /* Remove the current listener from the list */ + if (previous) { + previous->next = lr->next; + } + else { + ap_listeners = lr->next; + } + + /* Although we've removed ourselves from the list, + * we need to make sure that the next iteration won't + * consider "previous" a working IPv6 '::' socket. + * Changing the family is enough to make sure the + * conditions before make_sock() fail. + */ + lr->bind_addr->family = AF_INET; + + continue; + } +#endif + /* fatal error */ + return -1; + } + } + } + + /* close the old listeners */ + ap_close_listeners_ex(old_listeners); + old_listeners = NULL; + +#if AP_NONBLOCK_WHEN_MULTI_LISTEN + /* if multiple listening sockets, make them non-blocking so that + * if select()/poll() reports readability for a reset connection that + * is already forgotten about by the time we call accept, we won't + * be hung until another connection arrives on that port + */ + use_nonblock = (ap_listeners && ap_listeners->next); + for (lr = ap_listeners; lr; lr = lr->next) { + apr_status_t status; + + status = apr_socket_opt_set(lr->sd, APR_SO_NONBLOCK, use_nonblock); + if (status != APR_SUCCESS) { + ap_log_perror(APLOG_MARK, APLOG_STARTUP|APLOG_ERR, status, pool, APLOGNO(00079) + "unable to control socket non-blocking status"); + return -1; + } + } +#endif /* AP_NONBLOCK_WHEN_MULTI_LISTEN */ + + /* we come through here on both passes of the open logs phase + * only register the cleanup once... otherwise we try to close + * listening sockets twice when cleaning up prior to exec + */ + apr_pool_userdata_get(&data, userdata_key, pool); + if (!data) { + apr_pool_userdata_set((const void *)1, userdata_key, + apr_pool_cleanup_null, pool); + apr_pool_cleanup_register(pool, NULL, apr_pool_cleanup_null, + close_listeners_on_exec); + } + + return num_open ? 0 : -1; +} + +AP_DECLARE(int) ap_setup_listeners(server_rec *s) +{ + server_rec *ls; + server_addr_rec *addr; + ap_listen_rec *lr; + int num_listeners = 0; + const char* proto; + int found; + + for (ls = s; ls; ls = ls->next) { + proto = ap_get_server_protocol(ls); + if (!proto) { + found = 0; + /* No protocol was set for this vhost, + * use the default for this listener. + */ + for (addr = ls->addrs; addr && !found; addr = addr->next) { + for (lr = ap_listeners; lr; lr = lr->next) { + if (apr_sockaddr_equal(lr->bind_addr, addr->host_addr) && + lr->bind_addr->port == addr->host_port) { + ap_set_server_protocol(ls, lr->protocol); + found = 1; + break; + } + } + } + + if (!found) { + /* TODO: set protocol defaults per-Port, eg 25=smtp */ + ap_set_server_protocol(ls, "http"); + } + } + } + + if (open_listeners(s->process->pool)) { + return 0; + } + + for (lr = ap_listeners; lr; lr = lr->next) { + num_listeners++; + found = 0; + for (ls = s; ls && !found; ls = ls->next) { + for (addr = ls->addrs; addr && !found; addr = addr->next) { + if (apr_sockaddr_equal(lr->bind_addr, addr->host_addr) && + lr->bind_addr->port == addr->host_port) { + found = 1; + ap_apply_accept_filter(s->process->pool, lr, ls); + } + } + } + + if (!found) { + ap_apply_accept_filter(s->process->pool, lr, s); + } + } + + return num_listeners; +} + +AP_DECLARE(apr_status_t) ap_duplicate_listeners(apr_pool_t *p, server_rec *s, + ap_listen_rec ***buckets, + int *num_buckets) +{ + static int warn_once; + int i; + apr_status_t stat; + int use_nonblock = 0; + ap_listen_rec *lr; + + if (*num_buckets < 1) { + *num_buckets = 1; + if (ap_listencbratio > 0) { +#ifdef _SC_NPROCESSORS_ONLN + if (ap_have_so_reuseport) { + int num_online_cores = sysconf(_SC_NPROCESSORS_ONLN), + val = num_online_cores / ap_listencbratio; + if (val > 1) { + *num_buckets = val; + } + ap_log_perror(APLOG_MARK, APLOG_INFO, 0, p, APLOGNO(02819) + "Using %i listeners bucket(s) based on %i " + "online CPU cores and a ratio of %i", + *num_buckets, num_online_cores, + ap_listencbratio); + } + else +#endif + if (!warn_once) { + ap_log_perror(APLOG_MARK, APLOG_WARNING, 0, p, APLOGNO(02820) + "ListenCoresBucketsRatio ignored without " + "SO_REUSEPORT and _SC_NPROCESSORS_ONLN " + "support: using a single listeners bucket"); + warn_once = 1; + } + } + } + + *buckets = apr_pcalloc(p, *num_buckets * sizeof(ap_listen_rec *)); + (*buckets)[0] = ap_listeners; + + for (i = 1; i < *num_buckets; i++) { + ap_listen_rec *last = NULL; + lr = ap_listeners; + while (lr) { + ap_listen_rec *duplr; + char *hostname; + apr_port_t port; + apr_sockaddr_t *sa; + duplr = apr_palloc(p, sizeof(ap_listen_rec)); + duplr->slave = NULL; + duplr->protocol = apr_pstrdup(p, lr->protocol); + hostname = apr_pstrdup(p, lr->bind_addr->hostname); + port = lr->bind_addr->port; + apr_sockaddr_info_get(&sa, hostname, APR_UNSPEC, port, 0, p); + duplr->bind_addr = sa; + duplr->next = NULL; + stat = apr_socket_create(&duplr->sd, duplr->bind_addr->family, + SOCK_STREAM, 0, p); + if (stat != APR_SUCCESS) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, 0, p, APLOGNO(02640) + "ap_duplicate_listeners: for address %pI, " + "cannot duplicate a new socket!", + duplr->bind_addr); + return stat; + } + make_sock(p, duplr); +#if AP_NONBLOCK_WHEN_MULTI_LISTEN + use_nonblock = (ap_listeners && ap_listeners->next); + stat = apr_socket_opt_set(duplr->sd, APR_SO_NONBLOCK, use_nonblock); + if (stat != APR_SUCCESS) { + ap_log_perror(APLOG_MARK, APLOG_CRIT, stat, p, APLOGNO(02641) + "unable to control socket non-blocking status"); + return stat; + } +#endif + ap_apply_accept_filter(p, duplr, s); + + if (last == NULL) { + (*buckets)[i] = last = duplr; + } + else { + last->next = duplr; + last = duplr; + } + lr = lr->next; + } + } + + ap_listen_buckets = *buckets; + ap_num_listen_buckets = *num_buckets; + return APR_SUCCESS; +} + +AP_DECLARE_NONSTD(void) ap_close_listeners(void) +{ + int i; + + ap_close_listeners_ex(ap_listeners); + + /* Start from index 1 since either ap_duplicate_listeners() + * was called and ap_listen_buckets[0] == ap_listeners, or + * it wasn't and ap_num_listen_buckets == 0. + */ + for (i = 1; i < ap_num_listen_buckets; i++) { + ap_close_listeners_ex(ap_listen_buckets[i]); + } +} + +AP_DECLARE_NONSTD(void) ap_close_listeners_ex(ap_listen_rec *listeners) +{ + ap_listen_rec *lr; + for (lr = listeners; lr; lr = lr->next) { + apr_socket_close(lr->sd); + lr->active = 0; + } +} + +AP_DECLARE_NONSTD(int) ap_close_selected_listeners(ap_slave_t *slave) +{ + ap_listen_rec *lr; + int n = 0; + + for (lr = ap_listeners; lr; lr = lr->next) { + if (lr->slave != slave) { + apr_socket_close(lr->sd); + lr->active = 0; + } + else { + ++n; + } + } + return n; +} + +AP_DECLARE(void) ap_listen_pre_config(void) +{ + old_listeners = ap_listeners; + ap_listeners = NULL; + ap_listen_buckets = NULL; + ap_num_listen_buckets = 0; + ap_listenbacklog = DEFAULT_LISTENBACKLOG; + ap_listencbratio = 0; + + /* Check once whether or not SO_REUSEPORT is supported. */ + if (ap_have_so_reuseport < 0) { + /* This is limited to Linux with defined SO_REUSEPORT (ie. 3.9+) for + * now since the implementation evenly distributes connections across + * all the listening threads/processes. + * + * *BSDs have SO_REUSEPORT too but with a different semantic: the first + * wildcard address bound socket or the last non-wildcard address bound + * socket will receive connections (no evenness garantee); the rest of + * the sockets bound to the same port will not. + * This can't (always) work for httpd. + * + * TODO: latests DragonFlyBSD's SO_REUSEPORT (seems to?) have the same + * semantic as Linux, so we may need HAVE_SO_REUSEPORT available from + * configure.in some day. + */ +#if defined(SO_REUSEPORT) && defined(__linux__) + apr_socket_t *sock; + if (apr_socket_create(&sock, APR_UNSPEC, SOCK_STREAM, 0, + ap_pglobal) == APR_SUCCESS) { + int thesock, on = 1; + apr_os_sock_get(&thesock, sock); + ap_have_so_reuseport = (setsockopt(thesock, SOL_SOCKET, + SO_REUSEPORT, (void *)&on, + sizeof(int)) == 0); + apr_socket_close(sock); + } + else +#endif + ap_have_so_reuseport = 0; + + } +} + +AP_DECLARE_NONSTD(const char *) ap_set_listener(cmd_parms *cmd, void *dummy, + int argc, char *const argv[]) +{ + char *host, *scope_id, *proto; + apr_port_t port; + apr_status_t rv; + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + + if (err != NULL) { + return err; + } + + if (argc < 1 || argc > 2) { + return "Listen requires 1 or 2 arguments."; + } + + rv = apr_parse_addr_port(&host, &scope_id, &port, argv[0], cmd->pool); + if (rv != APR_SUCCESS) { + return "Invalid address or port"; + } + + if (host && !strcmp(host, "*")) { + host = NULL; + } + + if (scope_id) { + /* XXX scope id support is useful with link-local IPv6 addresses */ + return "Scope id is not supported"; + } + + if (!port) { + return "Port must be specified"; + } + + if (argc != 2) { + if (port == 443) { + proto = "https"; + } else { + proto = "http"; + } + } + else { + proto = apr_pstrdup(cmd->pool, argv[1]); + ap_str_tolower(proto); + } + + return alloc_listener(cmd->server->process, host, port, proto, NULL); +} + +AP_DECLARE_NONSTD(const char *) ap_set_listenbacklog(cmd_parms *cmd, + void *dummy, + const char *arg) +{ + int b; + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + + if (err != NULL) { + return err; + } + + b = atoi(arg); + if (b < 1) { + return "ListenBacklog must be > 0"; + } + + ap_listenbacklog = b; + return NULL; +} + +AP_DECLARE_NONSTD(const char *) ap_set_listencbratio(cmd_parms *cmd, + void *dummy, + const char *arg) +{ + int b; + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + + if (err != NULL) { + return err; + } + + b = atoi(arg); + if (b < 1) { + return "ListenCoresBucketsRatio must be > 0"; + } + + ap_listencbratio = b; + return NULL; +} + +AP_DECLARE_NONSTD(const char *) ap_set_send_buffer_size(cmd_parms *cmd, + void *dummy, + const char *arg) +{ + int s = atoi(arg); + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + + if (err != NULL) { + return err; + } + + if (s < 512 && s != 0) { + return "SendBufferSize must be >= 512 bytes, or 0 for system default."; + } + + send_buffer_size = s; + return NULL; +} + +AP_DECLARE_NONSTD(const char *) ap_set_receive_buffer_size(cmd_parms *cmd, + void *dummy, + const char *arg) +{ + int s = atoi(arg); + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + + if (err != NULL) { + return err; + } + + if (s < 512 && s != 0) { + return "ReceiveBufferSize must be >= 512 bytes, or 0 for system default."; + } + + receive_buffer_size = s; + return NULL; +} |