main.c

Apache HTTP Server 是一个功能强大的灵活的与HTTP/1.1相兼容的web服务器.这里给出的是Apache HTTP服务器的源码。

/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as
 * applicable.
 *
 * 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.h"
#include "apr_strings.h"
#include "apr_getopt.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "apr_md5.h"

#define APR_WANT_STDIO
#define APR_WANT_STRFUNC
#include "apr_want.h"

#define CORE_PRIVATE
#include "ap_config.h"
#include "httpd.h"
#include "http_main.h"
#include "http_log.h"
#include "http_config.h"
#include "http_vhost.h"
#include "apr_uri.h"
#include "util_ebcdic.h"
#include "ap_mpm.h"
#include "mpm_common.h"

/* WARNING: Win32 binds http_main.c dynamically to the server. Please place
 *          extern functions and global data in another appropriate module.
 *
 * Most significant main() global data can be found in http_config.c
 */

/* XXX - We should be able to grab the per-MPM settings here too */
static void show_compile_settings(void)
{
    printf("Server version: %s\n", ap_get_server_version());
    printf("Server built:   %s\n", ap_get_server_built());
    printf("Server's Module Magic Number: %u:%u\n",
           MODULE_MAGIC_NUMBER_MAJOR, MODULE_MAGIC_NUMBER_MINOR);

    /* sizeof(foo) is long on some platforms so we might as well
     * make it long everywhere to keep the printf format
     * consistent
     */
    printf("Architecture:   %ld-bit\n", 8 * (long)sizeof(void *));
    printf("Server compiled with....\n");
#ifdef BIG_SECURITY_HOLE
    printf(" -D BIG_SECURITY_HOLE\n");
#endif

#ifdef SECURITY_HOLE_PASS_AUTHORIZATION
    printf(" -D SECURITY_HOLE_PASS_AUTHORIZATION\n");
#endif

#ifdef APACHE_MPM_DIR
    printf(" -D APACHE_MPM_DIR=\"%s\"\n", APACHE_MPM_DIR);
#endif

#ifdef HAVE_SHMGET
    printf(" -D HAVE_SHMGET\n");
#endif

#if APR_FILE_BASED_SHM
    printf(" -D APR_FILE_BASED_SHM\n");
#endif

#if APR_HAS_SENDFILE
    printf(" -D APR_HAS_SENDFILE\n");
#endif

#if APR_HAS_MMAP
    printf(" -D APR_HAS_MMAP\n");
#endif

#ifdef NO_WRITEV
    printf(" -D NO_WRITEV\n");
#endif

#ifdef NO_LINGCLOSE
    printf(" -D NO_LINGCLOSE\n");
#endif

#if APR_HAVE_IPV6
    printf(" -D APR_HAVE_IPV6 (IPv4-mapped addresses ");
#ifdef AP_ENABLE_V4_MAPPED
    printf("enabled)\n");
#else
    printf("disabled)\n");
#endif
#endif

#if APR_USE_FLOCK_SERIALIZE
    printf(" -D APR_USE_FLOCK_SERIALIZE\n");
#endif

#if APR_USE_SYSVSEM_SERIALIZE
    printf(" -D APR_USE_SYSVSEM_SERIALIZE\n");
#endif

#if APR_USE_POSIXSEM_SERIALIZE
    printf(" -D APR_USE_POSIXSEM_SERIALIZE\n");
#endif

#if APR_USE_FCNTL_SERIALIZE
    printf(" -D APR_USE_FCNTL_SERIALIZE\n");
#endif

#if APR_USE_PROC_PTHREAD_SERIALIZE
    printf(" -D APR_USE_PROC_PTHREAD_SERIALIZE\n");
#endif

#if APR_USE_PTHREAD_SERIALIZE
    printf(" -D APR_USE_PTHREAD_SERIALIZE\n");
#endif

#if APR_PROCESS_LOCK_IS_GLOBAL
    printf(" -D APR_PROCESS_LOCK_IS_GLOBAL\n");
#endif

#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
    printf(" -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT\n");
#endif

#if APR_HAS_OTHER_CHILD
    printf(" -D APR_HAS_OTHER_CHILD\n");
#endif

#ifdef AP_HAVE_RELIABLE_PIPED_LOGS
    printf(" -D AP_HAVE_RELIABLE_PIPED_LOGS\n");
#endif

#ifdef BUFFERED_LOGS
    printf(" -D BUFFERED_LOGS\n");
#ifdef PIPE_BUF
    printf(" -D PIPE_BUF=%ld\n",(long)PIPE_BUF);
#endif
#endif

#if APR_CHARSET_EBCDIC
    printf(" -D APR_CHARSET_EBCDIC\n");
#endif

#ifdef APACHE_XLATE
    printf(" -D APACHE_XLATE\n");
#endif

#ifdef NEED_HASHBANG_EMUL
    printf(" -D NEED_HASHBANG_EMUL\n");
#endif

#ifdef SHARED_CORE
    printf(" -D SHARED_CORE\n");
#endif

/* This list displays the compiled in default paths: */
#ifdef HTTPD_ROOT
    printf(" -D HTTPD_ROOT=\"" HTTPD_ROOT "\"\n");
#endif

#ifdef SUEXEC_BIN
    printf(" -D SUEXEC_BIN=\"" SUEXEC_BIN "\"\n");
#endif

#if defined(SHARED_CORE) && defined(SHARED_CORE_DIR)
    printf(" -D SHARED_CORE_DIR=\"" SHARED_CORE_DIR "\"\n");
#endif

#ifdef DEFAULT_PIDLOG
    printf(" -D DEFAULT_PIDLOG=\"" DEFAULT_PIDLOG "\"\n");
#endif

#ifdef DEFAULT_SCOREBOARD
    printf(" -D DEFAULT_SCOREBOARD=\"" DEFAULT_SCOREBOARD "\"\n");
#endif

#ifdef DEFAULT_LOCKFILE
    printf(" -D DEFAULT_LOCKFILE=\"" DEFAULT_LOCKFILE "\"\n");
#endif

#ifdef DEFAULT_ERRORLOG
    printf(" -D DEFAULT_ERRORLOG=\"" DEFAULT_ERRORLOG "\"\n");
#endif

#ifdef AP_TYPES_CONFIG_FILE
    printf(" -D AP_TYPES_CONFIG_FILE=\"" AP_TYPES_CONFIG_FILE "\"\n");
#endif

#ifdef SERVER_CONFIG_FILE
    printf(" -D SERVER_CONFIG_FILE=\"" SERVER_CONFIG_FILE "\"\n");
#endif
}

static void destroy_and_exit_process(process_rec *process,
                                     int process_exit_value)
{
    apr_pool_destroy(process->pool); /* and destroy all descendent pools */
    apr_terminate();
    exit(process_exit_value);
}

static process_rec *create_process(int argc, const char * const *argv)
{
    process_rec *process;
    apr_pool_t *cntx;
    apr_status_t stat;

    stat = apr_pool_create(&cntx, NULL);
    if (stat != APR_SUCCESS) {
        /* XXX From the time that we took away the NULL pool->malloc mapping
         *     we have been unable to log here without segfaulting.
         */
        ap_log_error(APLOG_MARK, APLOG_ERR, stat, NULL,
                     "apr_pool_create() failed to create "
                     "initial context");
        apr_terminate();
        exit(1);
    }

    apr_pool_tag(cntx, "process");
    ap_open_stderr_log(cntx);

    process = apr_palloc(cntx, sizeof(process_rec));
    process->pool = cntx;

    apr_pool_create(&process->pconf, process->pool);
    apr_pool_tag(process->pconf, "pconf");
    process->argc = argc;
    process->argv = argv;
    process->short_name = apr_filename_of_pathname(argv[0]);
    return process;
}

static void usage(process_rec *process)
{
    const char *bin = process->argv[0];
    char pad[MAX_STRING_LEN];
    unsigned i;

    for (i = 0; i < strlen(bin); i++) {
        pad[i] = ' ';
    }

    pad[i] = '\0';

#ifdef SHARED_CORE
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL ,
                 "Usage: %s [-R directory] [-D name] [-d directory] [-f file]",
                 bin);
#else
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "Usage: %s [-D name] [-d directory] [-f file]", bin);
#endif

    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "       %s [-C \"directive\"] [-c \"directive\"]", pad);

#ifdef WIN32
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "       %s [-w] [-k start|restart|stop|shutdown]", pad);
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "       %s [-k install|config|uninstall] [-n service_name]",
                 pad);
#endif
#ifdef AP_MPM_WANT_SIGNAL_SERVER
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "       %s [-k start|restart|graceful|stop]",
                 pad);
#endif
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "       %s [-v] [-V] [-h] [-l] [-L] [-t] [-S]", pad);
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "Options:");

#ifdef SHARED_CORE
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -R directory      : specify an alternate location for "
                 "shared object files");
#endif

    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -D name           : define a name for use in "
                 "<IfDefine name> directives");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -d directory      : specify an alternate initial "
                 "ServerRoot");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -f file           : specify an alternate ServerConfigFile");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -C \"directive\"    : process directive before reading "
                 "config files");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -c \"directive\"    : process directive after reading "
                 "config files");

#ifdef NETWARE
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -n name           : set screen name");
#endif
#ifdef WIN32
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -n name           : set service name and use its "
                 "ServerConfigFile");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -k start          : tell Apache to start");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -k restart        : tell running Apache to do a graceful "
                 "restart");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -k stop|shutdown  : tell running Apache to shutdown");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -k install        : install an Apache service");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -k config         : change startup Options of an Apache "
                 "service");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -k uninstall      : uninstall an Apache service");
    ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                 "  -w                : hold open the console window on error");
#endif