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-rw-r--r--server/listen.c938
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diff --git a/server/listen.c b/server/listen.c
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+/* 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;
+}