listen.c revision f565372276b78ef58318da589cfbddce0694852b
6201N/A/* ====================================================================
6201N/A * The Apache Software License, Version 1.1
6201N/A *
6201N/A * Copyright (c) 2000 The Apache Software Foundation. All rights
6201N/A * reserved.
6201N/A *
6201N/A * Redistribution and use in source and binary forms, with or without
6201N/A * modification, are permitted provided that the following conditions
6201N/A * are met:
6201N/A *
6201N/A * 1. Redistributions of source code must retain the above copyright
6201N/A * notice, this list of conditions and the following disclaimer.
6201N/A *
6201N/A * 2. Redistributions in binary form must reproduce the above copyright
6201N/A * notice, this list of conditions and the following disclaimer in
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6201N/A * distribution.
6201N/A *
6201N/A * 3. The end-user documentation included with the redistribution,
6201N/A * if any, must include the following acknowledgment:
6201N/A * "This product includes software developed by the
6201N/A * Apache Software Foundation (http://www.apache.org/)."
6201N/A * Alternately, this acknowledgment may appear in the software itself,
6201N/A * if and wherever such third-party acknowledgments normally appear.
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6201N/A * permission, please contact apache@apache.org.
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6201N/A * 5. Products derived from this software may not be called "Apache",
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6201N/A * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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6201N/A *
6201N/A * This software consists of voluntary contributions made by many
6201N/A * individuals on behalf of the Apache Software Foundation. For more
6201N/A * information on the Apache Software Foundation, please see
6201N/A * <http://www.apache.org/>.
6201N/A *
6201N/A * Portions of this software are based upon public domain software
6201N/A * originally written at the National Center for Supercomputing Applications,
6201N/A * University of Illinois, Urbana-Champaign.
6201N/A */
6201N/A
6201N/A#include "apr_network_io.h"
6201N/A
6201N/A#define CORE_PRIVATE
6201N/A#include "ap_config.h"
6201N/A#include "httpd.h"
#include "http_config.h"
#include "ap_listen.h"
#include "apr_strings.h"
#include "http_log.h"
#include "mpm.h"
#include "mpm_common.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif
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 apr_status_t make_sock(apr_pool_t *p, ap_listen_rec *server)
{
apr_socket_t *s = server->sd;
int one = 1;
char addr[512];
apr_status_t stat;
apr_port_t port;
char *ipaddr;
apr_get_port(&port, APR_LOCAL, s);
apr_get_ipaddr(&ipaddr, APR_LOCAL, s);
apr_snprintf(addr, sizeof(addr), "address %s port %u", ipaddr,
(unsigned) port);
stat = apr_setsocketopt(s, APR_SO_REUSEADDR, one);
if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_CRIT, stat, NULL,
"make_sock: for %s, setsockopt: (SO_REUSEADDR)", addr);
apr_close_socket(s);
return stat;
}
stat = apr_setsocketopt(s, APR_SO_KEEPALIVE, one);
if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_CRIT, stat, NULL,
"make_sock: for %s, setsockopt: (SO_KEEPALIVE)", addr);
apr_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 = apr_setsocketopt(s, APR_SO_SNDBUF, send_buffer_size);
if (stat != APR_SUCCESS && stat != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_WARNING, stat, NULL,
"make_sock: failed to set SendBufferSize for %s, "
"using default", addr);
/* not a fatal error */
}
}
#if DISABLE_NAGLE_INHERITED
ap_sock_disable_nagle(s);
#endif
if ((stat = apr_bind(s)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, stat, NULL,
"make_sock: could not bind to %s", addr);
apr_close_socket(s);
return stat;
}
if ((stat = apr_listen(s, ap_listenbacklog)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, stat, NULL,
"make_sock: unable to listen for connections on %s", addr);
apr_close_socket(s);
return stat;
}
server->sd = s;
server->active = 1;
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_close_socket(lr->sd);
lr->active = 0;
}
return APR_SUCCESS;
}
static void alloc_listener(process_rec *process, char *addr, apr_port_t port)
{
ap_listen_rec **walk;
ap_listen_rec *new;
apr_status_t status;
char *oldaddr;
apr_port_t oldport;
/* see if we've got an old listener for this address:port */
for (walk = &old_listeners; *walk; walk = &(*walk)->next) {
apr_get_port(&oldport, APR_LOCAL, (*walk)->sd);
apr_get_ipaddr(&oldaddr, APR_LOCAL, (*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 */
new = apr_palloc(process->pool, sizeof(ap_listen_rec));
new->active = 0;
if ((status = apr_create_tcp_socket(&new->sd, process->pool)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, status, NULL,
"make_sock: failed to get a socket for %s", addr);
return;
}
apr_set_port(new->sd, APR_LOCAL, port);
apr_set_ipaddr(new->sd, APR_LOCAL, addr);
new->next = ap_listeners;
ap_listeners = new;
}
#if !defined(WIN32) && !defined(SPMT_OS2_MPM)
static
#endif
int ap_listen_open(process_rec *process, apr_port_t port)
{
apr_pool_t *pconf = process->pconf;
ap_listen_rec *lr;
ap_listen_rec *next;
int num_open;
/* allocate a default listener if necessary */
if (ap_listeners == NULL) {
alloc_listener(process, 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) {
apr_close_socket(lr->sd);
lr->active = 0;
next = lr->next;
/* free(lr);*/
}
old_listeners = NULL;
apr_register_cleanup(pconf, NULL, apr_null_cleanup, close_listeners_on_exec);
return num_open ? 0 : -1;
}
#if !defined(WIN32)
int ap_setup_listeners(server_rec *s)
{
ap_listen_rec *lr;
int num_listeners = 0;
if (ap_listen_open(s->process, s->port)) {
return 0;
}
for (lr = ap_listeners; lr; lr = lr->next) {
num_listeners++;
}
return num_listeners;
}
#endif
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 *ips=apr_pstrdup(cmd->pool, 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(cmd->server->process, APR_ANYADDR, port);
}
else {
ips[(ports - ips) - 1] = '\0';
alloc_listener(cmd->server->process, ips, port);
}
return NULL;
}
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;
}