| /* Copyright 1999-2004 The Apache Software Foundation |
| * |
| * Licensed 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" |
| |
| #define CORE_PRIVATE |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "ap_listen.h" |
| #include "http_log.h" |
| #include "mpm.h" |
| #include "mpm_common.h" |
| |
| ap_listen_rec *ap_listeners = NULL; |
| |
| static ap_listen_rec *old_listeners; |
| static int ap_listenbacklog; |
| static int send_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, |
| "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, |
| "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, |
| "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, |
| "make_sock: failed to set SendBufferSize for " |
| "address %pI, using default", |
| server->bind_addr); |
| /* not a fatal error */ |
| } |
| } |
| |
| #if APR_TCP_NODELAY_INHERITED |
| ap_sock_disable_nagle(s); |
| #endif |
| |
| if ((stat = apr_socket_bind(s, server->bind_addr)) != APR_SUCCESS) { |
| ap_log_perror(APLOG_MARK, APLOG_STARTUP|APLOG_CRIT, stat, p, |
| "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, |
| "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, |
| "make_sock: for address %pI, apr_socket_opt_set: (SO_REUSEADDR)", |
| server->bind_addr); |
| apr_socket_close(s); |
| return stat; |
| } |
| #endif |
| |
| #if APR_HAS_SO_ACCEPTFILTER |
| #ifndef ACCEPT_FILTER_NAME |
| #define ACCEPT_FILTER_NAME "httpready" |
| #ifdef __FreeBSD_version |
| #if __FreeBSD_version < 411000 /* httpready broken before 4.1.1 */ |
| #undef ACCEPT_FILTER_NAME |
| #define ACCEPT_FILTER_NAME "dataready" |
| #endif |
| #endif |
| #endif |
| apr_socket_accept_filter(s, ACCEPT_FILTER_NAME, ""); |
| #endif |
| |
| server->sd = s; |
| server->active = 1; |
| |
| #ifdef MPM_ACCEPT_FUNC |
| server->accept_func = MPM_ACCEPT_FUNC; |
| #else |
| server->accept_func = NULL; |
| #endif |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t close_listeners_on_exec(void *v) |
| { |
| ap_listen_rec *lr; |
| |
| for (lr = ap_listeners; lr; lr = lr->next) { |
| apr_socket_close(lr->sd); |
| lr->active = 0; |
| } |
| |
| return APR_SUCCESS; |
| } |
| |
| |
| static const char *alloc_listener(process_rec *process, char *addr, apr_port_t port) |
| { |
| ap_listen_rec **walk, *last; |
| apr_status_t status; |
| apr_sockaddr_t *sa; |
| int found_listener = 0; |
| |
| /* see if we've got an old listener for this address:port */ |
| for (walk = &old_listeners; *walk;) { |
| sa = (*walk)->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)))) { |
| new = *walk; |
| *walk = new->next; |
| new->next = ap_listeners; |
| ap_listeners = new; |
| found_listener = 1; |
| continue; |
| } |
| } |
| |
| walk = &(*walk)->next; |
| } |
| |
| if (found_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, |
| "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; |
| |
| /* 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, |
| "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; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static int ap_listen_open(apr_pool_t *pool, apr_port_t port) |
| { |
| ap_listen_rec *lr; |
| ap_listen_rec *next; |
| ap_listen_rec *previous; |
| int num_open; |
| const char *userdata_key = "ap_listen_open"; |
| void *data; |
| |
| /* 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 |
| int v6only_setting; |
| /* If we are trying to bind to 0.0.0.0 and the 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 (previous != NULL && |
| lr->bind_addr->family == APR_INET && |
| lr->bind_addr->sa.sin.sin_addr.s_addr == INADDR_ANY && |
| lr->bind_addr->port == previous->bind_addr->port && |
| previous->bind_addr->family == APR_INET6 && |
| IN6_IS_ADDR_UNSPECIFIED( |
| &previous->bind_addr->sa.sin6.sin6_addr) && |
| apr_socket_opt_get(previous->sd, APR_IPV6_V6ONLY, |
| &v6only_setting) == APR_SUCCESS && |
| v6only_setting == 0) { |
| |
| /* Remove the current listener from the list */ |
| previous->next = lr->next; |
| continue; |
| } |
| #endif |
| if (make_sock(pool, lr) == APR_SUCCESS) { |
| ++num_open; |
| lr->active = 1; |
| } |
| 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 && lr->bind_addr->family == APR_INET6 && |
| IN6_IS_ADDR_UNSPECIFIED( |
| &lr->bind_addr->sa.sin6.sin6_addr) && |
| lr->bind_addr->port == lr->next->bind_addr->port && |
| lr->next->bind_addr->family == APR_INET && |
| lr->next->bind_addr->sa.sin.sin_addr.s_addr == INADDR_ANY) { |
| |
| /* 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 */ |
| for (lr = old_listeners; lr; lr = next) { |
| apr_socket_close(lr->sd); |
| lr->active = 0; |
| next = lr->next; |
| } |
| 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 |
| */ |
| if (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, 1); |
| if (status != APR_SUCCESS) { |
| ap_log_perror(APLOG_MARK, APLOG_STARTUP|APLOG_ERR, status, pool, |
| "ap_listen_open: unable to make socket non-blocking"); |
| 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; |
| } |
| |
| int ap_setup_listeners(server_rec *s) |
| { |
| ap_listen_rec *lr; |
| int num_listeners = 0; |
| |
| if (ap_listen_open(s->process->pool, s->port)) { |
| return 0; |
| } |
| |
| for (lr = ap_listeners; lr; lr = lr->next) { |
| num_listeners++; |
| } |
| |
| return num_listeners; |
| } |
| |
| void ap_listen_pre_config(void) |
| { |
| old_listeners = ap_listeners; |
| ap_listeners = NULL; |
| ap_listenbacklog = DEFAULT_LISTENBACKLOG; |
| } |
| |
| |
| const char *ap_set_listener(cmd_parms *cmd, void *dummy, const char *ips) |
| { |
| char *host, *scope_id; |
| apr_port_t port; |
| apr_status_t rv; |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| |
| if (err != NULL) { |
| return err; |
| } |
| |
| rv = apr_parse_addr_port(&host, &scope_id, &port, ips, 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"; |
| } |
| |
| return alloc_listener(cmd->server->process, host, port); |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |