listen.c revision 283cab4ec4c440fe33ce47778d85b1208e169a87
f757855e81fc0bc116de372220096e532afb5cb8Lennart Poettering/* ====================================================================
* Copyright (c) 1998-1999 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
#include "apr_network_io.h"
#include "httpd.h"
#include "http_config.h"
#include "ap_listen.h"
#include "http_log.h"
ap_listen_rec *ap_listeners;
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 ap_status_t make_sock(ap_context_t *p, ap_listen_rec *server)
{
ap_socket_t *s = server->sd;
int one = 1;
char addr[512];
ap_status_t stat;
stat = ap_setsocketopt(s, APR_SO_REUSEADDR, one);
if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_CRIT, NULL,
"make_sock: for %s, setsockopt: (SO_REUSEADDR)", addr);
ap_close_socket(s);
return stat;
}
stat = ap_setsocketopt(s, APR_SO_KEEPALIVE, one);
if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_CRIT, NULL,
"make_sock: for %s, setsockopt: (SO_KEEPALIVE)", addr);
ap_close_socket(s);
return stat;
}
/*
* 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 = ap_setsocketopt(s, SO_SNDBUF, send_buffer_size);
if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
"make_sock: failed to set SendBufferSize for %s, "
"using default", addr);
/* not a fatal error */
}
}
if ((stat = ap_bind(s)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, NULL,
"make_sock: could not bind to %s", addr);
ap_close_socket(s);
return stat;
}
if ((stat = ap_listen(s, ap_listenbacklog)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, NULL,
"make_sock: unable to listen for connections on %s", addr);
ap_close_socket(s);
return stat;
}
server->sd = s;
server->active = 1;
return APR_SUCCESS;
}
static ap_status_t close_listeners_on_exec(void *v)
{
ap_listen_rec *lr;
for (lr = ap_listeners; lr; lr = lr->next) {
ap_close_socket(lr->sd);
lr->active = 0;
}
return APR_SUCCESS;
}
static void alloc_listener(char *addr, unsigned int port)
{
ap_listen_rec **walk;
ap_listen_rec *new;
char oldaddr[17];
unsigned int oldport;
/* see if we've got an old listener for this address:port */
for (walk = &old_listeners; *walk; walk = &(*walk)->next) {
ap_getport((*walk)->sd, &oldport);
ap_getipaddr(oldaddr,sizeof oldaddr,(*walk)->sd);
if (!strcmp(oldaddr, addr) && port == oldport) {
/* re-use existing record */
new = *walk;
*walk = new->next;
new->next = ap_listeners;
ap_listeners = new;
return;
}
}
/* this has to survive restarts */
/* XXX - We need to deal with freeing this structure properly. */
new = malloc(sizeof(ap_listen_rec));
new->active = 0;
if (ap_create_tcp_socket(NULL, &new->sd) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, NULL,
"make_sock: failed to get a socket for %s", addr);
return;
}
ap_setport(new->sd, port);
ap_setipaddr(new->sd, addr);
new->next = ap_listeners;
ap_listeners = new;
}
int ap_listen_open(ap_context_t *pconf, unsigned port)
{
ap_listen_rec *lr;
ap_listen_rec *next;
int num_open;
/* allocate a default listener if necessary */
if (ap_listeners == NULL) {
alloc_listener(APR_ANYADDR, port ? port : DEFAULT_HTTP_PORT);
}
num_open = 0;
for (lr = ap_listeners; lr; lr = lr->next) {
if (lr->active) {
++num_open;
}
else {
if (make_sock(pconf, lr) == APR_SUCCESS) {
++num_open;
lr->active = 1;
}
}
}
/* close the old listeners */
for (lr = old_listeners; lr; lr = next) {
ap_close_socket(lr->sd);
lr->active = 0;
next = lr->next;
/* free(lr);*/
}
old_listeners = NULL;
ap_register_cleanup(pconf, NULL, ap_null_cleanup, close_listeners_on_exec);
return num_open ? 0 : -1;
}
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, char *ips)
{
char *ports;
unsigned short port;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ports = strchr(ips, ':');
if (ports != NULL) {
if (ports == ips) {
return "Missing IP address";
}
else if (ports[1] == '\0') {
return "Address must end in :<port-number>";
}
*(ports++) = '\0';
}
else {
ports = ips;
}
port = atoi(ports);
if (!port) {
return "Port must be numeric";
}
if (ports == ips) { /* no address */
alloc_listener(APR_ANYADDR, port);
}
else {
ips[(ports - ips) - 1] = '\0';
alloc_listener(ips, port);
}
return NULL;
}
const char *ap_set_listenbacklog(cmd_parms *cmd, void *dummy, 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, 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;
}