| 1 |
/* |
| 2 |
* Boa, an http server |
| 3 |
* Copyright (C) 1995 Paul Phillips <paulp@go2net.com> |
| 4 |
* Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com> |
| 5 |
* Some changes Copyright (C) 1996 Larry Doolittle <ldoolitt@boa.org> |
| 6 |
* Some changes Copyright (C) 1996-2002 Jon Nelson <jnelson@boa.org> |
| 7 |
* Portions Copyright (C) 2002 Nikos Mavroyanopoulos <nmav@gnutls.org> |
| 8 |
* |
| 9 |
* This program is free software; you can redistribute it and/or modify |
| 10 |
* it under the terms of the GNU General Public License as published by |
| 11 |
* the Free Software Foundation; either version 1, or (at your option) |
| 12 |
* any later version. |
| 13 |
* |
| 14 |
* This program is distributed in the hope that it will be useful, |
| 15 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 |
* GNU General Public License for more details. |
| 18 |
* |
| 19 |
* You should have received a copy of the GNU General Public License |
| 20 |
* along with this program; if not, write to the Free Software |
| 21 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 |
* |
| 23 |
*/ |
| 24 |
|
| 25 |
/* $Id: boa.c,v 1.9 2002/09/27 23:40:29 nmav Exp $*/ |
| 26 |
|
| 27 |
#include "boa.h" |
| 28 |
#include "ssl.h" |
| 29 |
#include <sys/resource.h> |
| 30 |
#ifdef ENABLE_SMP |
| 31 |
pthread_t father_id; |
| 32 |
#endif |
| 33 |
|
| 34 |
extern int ssl_params_refresh; |
| 35 |
|
| 36 |
/* globals */ |
| 37 |
int backlog = SO_MAXCONN; |
| 38 |
time_t start_time; |
| 39 |
|
| 40 |
time_t current_time; |
| 41 |
|
| 42 |
|
| 43 |
/* static to boa.c */ |
| 44 |
static void fixup_server_root(void); |
| 45 |
static socket_type create_server_socket( int port, int); |
| 46 |
static void hic_init(void); |
| 47 |
static void drop_privs(void); |
| 48 |
static server_params *smp_init(socket_type server_s[2]); |
| 49 |
static int sock_opt = 1; |
| 50 |
static int do_fork = 1; |
| 51 |
int devnullfd = -1; |
| 52 |
|
| 53 |
int main(int argc, char **argv) |
| 54 |
{ |
| 55 |
int c; /* command line arg */ |
| 56 |
socket_type server_s[2] = {{ -1, 0, 0, 0}, { -1, -1, 0, 0 }}; /* boa socket */ |
| 57 |
server_params *params; |
| 58 |
|
| 59 |
/* set umask to u+rw, u-x, go-rwx */ |
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c = umask(~0600); |
| 61 |
if (c == -1) { |
| 62 |
perror("umask"); |
| 63 |
exit(1); |
| 64 |
} |
| 65 |
|
| 66 |
devnullfd = open("/dev/null", 0); |
| 67 |
|
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/* make STDIN and STDOUT point to /dev/null */ |
| 69 |
if (devnullfd == -1) { |
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DIE("can't open /dev/null"); |
| 71 |
} |
| 72 |
|
| 73 |
if (dup2(devnullfd, STDIN_FILENO) == -1) { |
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DIE("can't dup2 /dev/null to STDIN_FILENO"); |
| 75 |
} |
| 76 |
|
| 77 |
if (dup2(devnullfd, STDOUT_FILENO) == -1) { |
| 78 |
DIE("can't dup2 /dev/null to STDOUT_FILENO"); |
| 79 |
} |
| 80 |
|
| 81 |
/* but first, update timestamp, because log_error_time uses it */ |
| 82 |
(void) time(¤t_time); |
| 83 |
|
| 84 |
while ((c = getopt(argc, argv, "c:r:d")) != -1) { |
| 85 |
switch (c) { |
| 86 |
case 'c': |
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if (server_root) |
| 88 |
free(server_root); |
| 89 |
server_root = strdup(optarg); |
| 90 |
if (!server_root) { |
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perror("strdup (for server_root)"); |
| 92 |
exit(1); |
| 93 |
} |
| 94 |
break; |
| 95 |
case 'r': |
| 96 |
if (chdir(optarg) == -1) { |
| 97 |
log_error_time(); |
| 98 |
perror("chdir (to chroot)"); |
| 99 |
exit(1); |
| 100 |
} |
| 101 |
if (chroot(optarg) == -1) { |
| 102 |
log_error_time(); |
| 103 |
perror("chroot"); |
| 104 |
exit(1); |
| 105 |
} |
| 106 |
if (chdir("/") == -1) { |
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log_error_time(); |
| 108 |
perror("chdir (after chroot)"); |
| 109 |
exit(1); |
| 110 |
} |
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break; |
| 112 |
case 'd': |
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do_fork = 0; |
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break; |
| 115 |
default: |
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fprintf(stderr, "Usage: %s [-c serverroot] [-r chroot] [-d]\n", argv[0]); |
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exit(1); |
| 118 |
} |
| 119 |
} |
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|
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fixup_server_root(); |
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read_config_files(); |
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open_logs(); |
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|
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if ((boa_ssl >= 2 || boa_ssl == 0) && server_port > 0) { |
| 126 |
server_s[0] = create_server_socket( server_port, 0); |
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} |
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|
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if (boa_ssl != 0 && ssl_port > 0) { |
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server_s[1] = create_server_socket( ssl_port, 1); |
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} |
| 132 |
|
| 133 |
if (server_s[1].socket == -1 && server_s[0].socket == -1) { |
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log_error_time(); |
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fprintf(stderr, "Could not initialize sockets\n"); |
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exit(1); |
| 137 |
} |
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|
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init_signals(); |
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drop_privs(); |
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create_common_env(); |
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build_needs_escape(); |
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|
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if (boa_ssl) { |
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initialize_ssl(); |
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} |
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|
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initialize_mmap(); |
| 149 |
|
| 150 |
if (max_connections < 1) { |
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struct rlimit rl; |
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|
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/* has not been set explicitly */ |
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c = getrlimit(RLIMIT_NOFILE, &rl); |
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if (c < 0) { |
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perror("getrlimit"); |
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exit(1); |
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} |
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max_connections = rl.rlim_cur; |
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} |
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|
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/* background ourself */ |
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if (do_fork) { |
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switch(fork()) { |
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case -1: |
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/* error */ |
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perror("fork"); |
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exit(1); |
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break; |
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case 0: |
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/* child, success */ |
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break; |
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default: |
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/* parent, success */ |
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exit(0); |
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break; |
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} |
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} |
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|
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/* main loop */ |
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timestamp(); |
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|
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start_time = current_time; |
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|
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/* Blocks signals that are not supposed to be catched |
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* by the children. |
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*/ |
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block_main_signals(); |
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|
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hic_init(); |
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|
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/* spawn the children pool |
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*/ |
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params = smp_init( server_s); |
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|
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/* unblock signals for daddy |
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*/ |
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unblock_main_signals(); |
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|
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/* regenerate parameters in that time interval |
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*/ |
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if (boa_ssl) { |
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if (ssl_params_refresh < DEFAULT_SSL_PARAMS_REFRESH) { |
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log_error_time(); |
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fprintf(stderr, "SSL parameters will be refreshed every %d minutes\n", |
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DEFAULT_SSL_PARAMS_REFRESH/60); |
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ssl_params_refresh = DEFAULT_SSL_PARAMS_REFRESH; |
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} |
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alarm( ssl_params_refresh); |
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} |
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|
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select_loop( params); |
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|
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return 0; |
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} |
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|
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server_params *global_server_params; |
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int global_server_params_size; |
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|
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extern int server_max_threads; |
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|
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/* This function will return a server_params pointer. This |
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* pointer is to be used as a pointer to the select loop. |
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*/ |
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static server_params* smp_init( socket_type server_s[2]) |
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{ |
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int i; |
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server_params *params; |
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|
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#ifdef ENABLE_SMP |
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pthread_t tid; |
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int max_threads = server_max_threads; |
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|
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father_id = pthread_self(); |
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#else |
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const int max_threads = 1; |
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#endif |
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|
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params = malloc( sizeof(server_params) * max_threads); |
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if (params == NULL) { |
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log_error_time(); |
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fprintf(stderr, |
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"Could not allocate memory.\n"); |
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exit(1); |
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} |
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|
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for (i=0;i<max_threads;i++) { |
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params[i].server_s[0] = server_s[0]; |
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params[i].server_s[1] = server_s[1]; |
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params[i].request_ready = NULL; |
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params[i].request_block = NULL; |
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params[i].request_free = NULL; |
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|
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/* for signal handling */ |
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params[i].sighup_flag = 0; |
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params[i].sigchld_flag = 0; |
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params[i].sigalrm_flag = 0; |
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params[i].sigusr1_flag = 0; |
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params[i].sigterm_flag = 0; |
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|
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params[i].sockbufsize = SOCKETBUF_SIZE; |
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|
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params[i].status.requests = 0; |
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params[i].status.errors = 0; |
| 265 |
|
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params[i].total_connections = 0; |
| 267 |
params[i].max_fd = 0; |
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|
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params[i].handle_sigbus = 0; |
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} |
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|
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#ifdef ENABLE_SMP |
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params[0].tid = father_id; |
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|
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for( i=1;i<max_threads;i++) { |
| 276 |
if (pthread_create( &tid, NULL, &select_loop, ¶ms[i]) != 0) |
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{ |
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log_error_time(); |
| 279 |
fprintf(stderr, |
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"Could not dispatch threads.\n"); |
| 281 |
exit(1); |
| 282 |
} |
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params[i].tid = tid; |
| 284 |
} |
| 285 |
#endif |
| 286 |
|
| 287 |
if (max_threads > 1) { |
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log_error_time(); |
| 289 |
fprintf(stderr, |
| 290 |
"%s: Generated pool of %d threads.\n", SERVER_NAME, max_threads); |
| 291 |
} |
| 292 |
|
| 293 |
global_server_params_size = max_threads; |
| 294 |
global_server_params = params; |
| 295 |
|
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return ¶ms[0]; |
| 297 |
} |
| 298 |
|
| 299 |
void smp_reinit() |
| 300 |
{ |
| 301 |
#ifdef ENABLE_SMP |
| 302 |
int i; |
| 303 |
server_params *params = global_server_params; |
| 304 |
int max_threads = server_max_threads; |
| 305 |
#else |
| 306 |
int max_threads = 1; |
| 307 |
#endif |
| 308 |
|
| 309 |
if (global_server_params_size < max_threads) { |
| 310 |
log_error_time(); |
| 311 |
fprintf(stderr, |
| 312 |
"Cannot increase threads on runtime.\n"); |
| 313 |
max_threads = global_server_params_size; |
| 314 |
} |
| 315 |
|
| 316 |
#ifdef ENABLE_SMP |
| 317 |
for( i=1;i<max_threads;i++) { |
| 318 |
pthread_t tid; |
| 319 |
if (pthread_create( &tid, NULL, &select_loop, ¶ms[i]) != 0) |
| 320 |
{ |
| 321 |
log_error_time(); |
| 322 |
fprintf(stderr, |
| 323 |
"Could not dispatch threads.\n"); |
| 324 |
exit(1); |
| 325 |
} |
| 326 |
params[i].tid = tid; |
| 327 |
} |
| 328 |
#endif |
| 329 |
|
| 330 |
if (max_threads > 0) { |
| 331 |
log_error_time(); |
| 332 |
fprintf(stderr, |
| 333 |
"Regenerated a pool of %d threads.\n", max_threads); |
| 334 |
} |
| 335 |
|
| 336 |
return; |
| 337 |
} |
| 338 |
|
| 339 |
#ifdef ENABLE_HIC |
| 340 |
|
| 341 |
pthread_t hic_tid; |
| 342 |
|
| 343 |
/* This function will return a server_params pointer. This |
| 344 |
* pointer is to be used as a pointer to the select loop. |
| 345 |
*/ |
| 346 |
static void hic_init() |
| 347 |
{ |
| 348 |
|
| 349 |
#ifdef ENABLE_SMP |
| 350 |
|
| 351 |
if (pthread_create( &hic_tid, NULL, &hic_main_loop, NULL) != 0) |
| 352 |
{ |
| 353 |
log_error_time(); |
| 354 |
fprintf(stderr, |
| 355 |
"Could not dispatch hic thread.\n"); |
| 356 |
exit(1); |
| 357 |
} |
| 358 |
|
| 359 |
log_error_time(); |
| 360 |
fprintf(stderr, |
| 361 |
"%s: Dispatched HIC main thread.\n", SERVER_NAME); |
| 362 |
|
| 363 |
#endif |
| 364 |
|
| 365 |
return; |
| 366 |
} |
| 367 |
|
| 368 |
#endif /* ENABLE_HIC */ |
| 369 |
|
| 370 |
static socket_type create_server_socket( int port, int secure) |
| 371 |
{ |
| 372 |
socket_type server_s; |
| 373 |
|
| 374 |
server_s.secure = secure; |
| 375 |
server_s.port = port; |
| 376 |
|
| 377 |
server_s.socket = socket(SERVER_AF, SOCK_STREAM, IPPROTO_TCP); |
| 378 |
if (server_s.socket == -1) { |
| 379 |
DIE("unable to create socket"); |
| 380 |
} |
| 381 |
|
| 382 |
/* server socket is nonblocking */ |
| 383 |
if (set_nonblock_fd(server_s.socket) == -1) { |
| 384 |
DIE("fcntl: unable to set server socket to nonblocking"); |
| 385 |
} |
| 386 |
|
| 387 |
/* close server socket on exec so cgi's can't write to it */ |
| 388 |
if (fcntl(server_s.socket, F_SETFD, 1) == -1) { |
| 389 |
DIE("can't set close-on-exec on server socket!"); |
| 390 |
} |
| 391 |
|
| 392 |
/* reuse socket addr */ |
| 393 |
if ((setsockopt(server_s.socket, SOL_SOCKET, SO_REUSEADDR, (void *) &sock_opt, |
| 394 |
sizeof (sock_opt))) == -1) { |
| 395 |
DIE("setsockopt"); |
| 396 |
} |
| 397 |
|
| 398 |
/* internet family-specific code encapsulated in bind_server() */ |
| 399 |
if (bind_server(server_s.socket, server_ip, port) == -1) { |
| 400 |
DIE("unable to bind"); |
| 401 |
} |
| 402 |
|
| 403 |
/* listen: large number just in case your kernel is nicely tweaked */ |
| 404 |
if (listen(server_s.socket, backlog) == -1) { |
| 405 |
DIE("unable to listen"); |
| 406 |
} |
| 407 |
return server_s; |
| 408 |
} |
| 409 |
|
| 410 |
static void drop_privs(void) |
| 411 |
{ |
| 412 |
/* give away our privs if we can */ |
| 413 |
if (getuid() == 0) { |
| 414 |
struct passwd *passwdbuf; |
| 415 |
passwdbuf = getpwuid(server_uid); |
| 416 |
if (passwdbuf == NULL) { |
| 417 |
DIE("getpwuid"); |
| 418 |
} |
| 419 |
if (initgroups(passwdbuf->pw_name, passwdbuf->pw_gid) == -1) { |
| 420 |
DIE("initgroups"); |
| 421 |
} |
| 422 |
if (setgid(server_gid) == -1) { |
| 423 |
DIE("setgid"); |
| 424 |
} |
| 425 |
if (setuid(server_uid) == -1) { |
| 426 |
DIE("setuid"); |
| 427 |
} |
| 428 |
/* test for failed-but-return-was-successful setuid |
| 429 |
* http://www.securityportal.com/list-archive/bugtraq/2000/Jun/0101.html |
| 430 |
*/ |
| 431 |
if (setuid(0) != -1) { |
| 432 |
DIE("icky Linux kernel bug!"); |
| 433 |
} |
| 434 |
} else { |
| 435 |
if (server_gid || server_uid) { |
| 436 |
log_error_time(); |
| 437 |
fprintf(stderr, "Warning: " |
| 438 |
"Not running as root: no attempt to change" |
| 439 |
" to uid %d gid %d\n", server_uid, server_gid); |
| 440 |
} |
| 441 |
server_gid = getgid(); |
| 442 |
server_uid = getuid(); |
| 443 |
} |
| 444 |
} |
| 445 |
|
| 446 |
/* |
| 447 |
* Name: fixup_server_root |
| 448 |
* |
| 449 |
* Description: Makes sure the server root is valid. |
| 450 |
* |
| 451 |
*/ |
| 452 |
|
| 453 |
static void fixup_server_root() |
| 454 |
{ |
| 455 |
char *dirbuf; |
| 456 |
|
| 457 |
if (!server_root) { |
| 458 |
#ifdef SERVER_ROOT |
| 459 |
server_root = strdup(SERVER_ROOT); |
| 460 |
if (!server_root) { |
| 461 |
perror("strdup (SERVER_ROOT)"); |
| 462 |
exit(1); |
| 463 |
} |
| 464 |
#else |
| 465 |
fputs(SERVER_NAME": don't know where server root is. Please #define " |
| 466 |
"SERVER_ROOT in defines.h\n" |
| 467 |
"and recompile, or use the -c command line option to " |
| 468 |
"specify it.\n", stderr); |
| 469 |
exit(1); |
| 470 |
#endif |
| 471 |
} |
| 472 |
|
| 473 |
if (chdir(server_root) == -1) { |
| 474 |
fprintf(stderr, "Could not chdir to \"%s\": aborting\n", |
| 475 |
server_root); |
| 476 |
exit(1); |
| 477 |
} |
| 478 |
|
| 479 |
dirbuf = normalize_path(server_root); |
| 480 |
free(server_root); |
| 481 |
server_root = dirbuf; |
| 482 |
} |
| 483 |
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