diff options
Diffstat (limited to 'rubbos/app/httpd-2.0.64/server/listen.c')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/server/listen.c | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/rubbos/app/httpd-2.0.64/server/listen.c b/rubbos/app/httpd-2.0.64/server/listen.c new file mode 100644 index 00000000..32bc72a5 --- /dev/null +++ b/rubbos/app/httpd-2.0.64/server/listen.c @@ -0,0 +1,494 @@ +/* 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" + +#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; + +#if APR_HAVE_IPV6 +static int default_family = APR_UNSPEC; +#else +static int default_family = APR_INET; +#endif + +static ap_listen_rec *old_listeners; +static int ap_listenbacklog; +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, + "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 (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, + "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 ((stat = apr_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_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 was 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 void find_default_family(apr_pool_t *p) +{ +#if APR_HAVE_IPV6 + /* We know the platform supports IPv6, but this particular + * system may not have IPv6 enabled. See if we can get an + * AF_INET6 socket and bind to an ephemeral port. (On most + * systems, getting an AF_INET6 socket is a sufficient test. + * On certain levels of OpenUNIX, getting the socket is + * successful but bind always returns ENETUNREACH.) + */ + if (default_family == APR_UNSPEC) { + apr_status_t sock_rv; + apr_socket_t *tmp_sock; + apr_sockaddr_t *sa; + + if ((sock_rv = apr_socket_create(&tmp_sock, APR_INET6, SOCK_STREAM, p)) + == APR_SUCCESS && + apr_sockaddr_info_get(&sa, NULL, APR_INET6, 0, 0, p) == APR_SUCCESS && + apr_bind(tmp_sock, sa) == APR_SUCCESS) { + default_family = APR_INET6; + } + else { + default_family = APR_INET; + } + if (sock_rv == APR_SUCCESS) { + apr_socket_close(tmp_sock); + } + } +#endif +} + + +static const char *alloc_listener(process_rec *process, char *addr, apr_port_t port) +{ + ap_listen_rec **walk; + ap_listen_rec *new; + apr_status_t status; + apr_port_t oldport; + apr_sockaddr_t *sa; + + if (!addr) { /* don't bind to specific interface */ + find_default_family(process->pool); + switch(default_family) { + case APR_INET: + addr = "0.0.0.0"; + break; + +#if APR_HAVE_IPV6 + case APR_INET6: + addr = "::"; + break; +#endif + + default: + ap_assert(1 != 1); /* should not occur */ + } + } + + /* see if we've got an old listener for this address:port */ + for (walk = &old_listeners; *walk; walk = &(*walk)->next) { + sa = (*walk)->bind_addr; + /* Some listeners are not real so they will not have a bind_addr. */ + if (sa) { + apr_sockaddr_port_get(&oldport, sa); + if (!strcmp(sa->hostname, addr) && port == oldport) { + /* re-use existing record */ + new = *walk; + *walk = new->next; + new->next = ap_listeners; + ap_listeners = new; + return NULL; + } + } + } + + /* this has to survive restarts */ + new = apr_palloc(process->pool, sizeof(ap_listen_rec)); + new->active = 0; + if ((status = apr_sockaddr_info_get(&new->bind_addr, 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"; + } + if ((status = apr_socket_create(&new->sd, + new->bind_addr->family, + SOCK_STREAM, process->pool)) + != 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"; + } + + new->next = ap_listeners; + ap_listeners = new; + return NULL; +} + +static int ap_listen_open(apr_pool_t *pool, apr_port_t port) +{ + ap_listen_rec *lr; + ap_listen_rec *next; + 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; + for (lr = ap_listeners; lr; lr = lr->next) { + if (lr->active) { + ++num_open; + } + else { + if (make_sock(pool, lr) == APR_SUCCESS) { + ++num_open; + lr->active = 1; + } + else { + /* 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; +} + +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; +} |