1 |
/* |
2 |
* Hydra, an http server (based on Boa 0.94.13) |
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. |
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* |
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* 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 1.20 2002/10/02 20:07:25 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 |
void hic_init(void); |
47 |
static void initialize_rlimits(); |
48 |
static void drop_privs(void); |
49 |
static server_params *smp_init(socket_type server_s[2]); |
50 |
static void create_server_names( void); |
51 |
|
52 |
static int sock_opt = 1; |
53 |
static int do_fork = 1; |
54 |
int devnullfd = -1; |
55 |
|
56 |
int main(int argc, char **argv) |
57 |
{ |
58 |
int c; /* command line arg */ |
59 |
socket_type server_s[2] = { {-1, 0, 0, 0}, {-1, -1, 0, 0} }; /* boa socket */ |
60 |
server_params *params; |
61 |
|
62 |
/* set umask to u+rw, u-x, go-rwx */ |
63 |
c = umask(~0600); |
64 |
if (c == -1) { |
65 |
perror("umask"); |
66 |
exit(1); |
67 |
} |
68 |
|
69 |
devnullfd = open("/dev/null", 0); |
70 |
|
71 |
/* make STDIN and STDOUT point to /dev/null */ |
72 |
if (devnullfd == -1) { |
73 |
DIE("can't open /dev/null"); |
74 |
} |
75 |
|
76 |
if (dup2(devnullfd, STDIN_FILENO) == -1) { |
77 |
DIE("can't dup2 /dev/null to STDIN_FILENO"); |
78 |
} |
79 |
|
80 |
if (dup2(devnullfd, STDOUT_FILENO) == -1) { |
81 |
DIE("can't dup2 /dev/null to STDOUT_FILENO"); |
82 |
} |
83 |
|
84 |
/* but first, update timestamp, because log_error_time uses it */ |
85 |
(void) time(¤t_time); |
86 |
|
87 |
while ((c = getopt(argc, argv, "c:r:d")) != -1) { |
88 |
switch (c) { |
89 |
case 'c': |
90 |
if (server_root) |
91 |
free(server_root); |
92 |
server_root = strdup(optarg); |
93 |
if (!server_root) { |
94 |
perror("strdup (for server_root)"); |
95 |
exit(1); |
96 |
} |
97 |
break; |
98 |
case 'r': |
99 |
if (chdir(optarg) == -1) { |
100 |
log_error_time(); |
101 |
perror("chdir (to chroot)"); |
102 |
exit(1); |
103 |
} |
104 |
if (chroot(optarg) == -1) { |
105 |
log_error_time(); |
106 |
perror("chroot"); |
107 |
exit(1); |
108 |
} |
109 |
if (chdir("/") == -1) { |
110 |
log_error_time(); |
111 |
perror("chdir (after chroot)"); |
112 |
exit(1); |
113 |
} |
114 |
break; |
115 |
case 'd': |
116 |
do_fork = 0; |
117 |
break; |
118 |
default: |
119 |
fprintf(stderr, "Usage: %s [-c serverroot] [-r chroot] [-d]\n", |
120 |
argv[0]); |
121 |
exit(1); |
122 |
} |
123 |
} |
124 |
|
125 |
create_server_names(); |
126 |
fixup_server_root(); |
127 |
read_config_files(); |
128 |
open_logs(); |
129 |
|
130 |
if ((boa_ssl >= 2 || boa_ssl == 0) && server_port > 0) { |
131 |
server_s[0] = create_server_socket(server_port, 0); |
132 |
} |
133 |
|
134 |
if (boa_ssl != 0 && ssl_port > 0) { |
135 |
server_s[1] = create_server_socket(ssl_port, 1); |
136 |
} |
137 |
|
138 |
if (server_s[1].socket == -1 && server_s[0].socket == -1) { |
139 |
log_error_time(); |
140 |
fprintf(stderr, "Could not initialize sockets\n"); |
141 |
exit(1); |
142 |
} |
143 |
|
144 |
init_signals(); |
145 |
initialize_rlimits(); |
146 |
|
147 |
drop_privs(); |
148 |
create_common_env(); |
149 |
build_needs_escape(); |
150 |
|
151 |
#ifdef ENABLE_SSL |
152 |
if (boa_ssl) { |
153 |
initialize_ssl(); |
154 |
} |
155 |
#endif |
156 |
|
157 |
initialize_mmap(); |
158 |
|
159 |
/* background ourself */ |
160 |
if (do_fork) { |
161 |
switch (fork()) { |
162 |
case -1: |
163 |
/* error */ |
164 |
perror("fork"); |
165 |
exit(1); |
166 |
break; |
167 |
case 0: |
168 |
/* child, success */ |
169 |
break; |
170 |
default: |
171 |
/* parent, success */ |
172 |
exit(0); |
173 |
break; |
174 |
} |
175 |
} |
176 |
|
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/* main loop */ |
178 |
timestamp(); |
179 |
|
180 |
start_time = current_time; |
181 |
|
182 |
/* Blocks signals that are not supposed to be catched |
183 |
* by the children. |
184 |
*/ |
185 |
block_main_signals(); |
186 |
|
187 |
#ifdef ENABLE_HIC |
188 |
hic_init(); |
189 |
#endif |
190 |
|
191 |
/* spawn the children pool |
192 |
*/ |
193 |
params = smp_init(server_s); |
194 |
|
195 |
/* unblock signals for daddy |
196 |
*/ |
197 |
unblock_main_signals(); |
198 |
|
199 |
/* regenerate parameters in that time interval |
200 |
*/ |
201 |
#ifdef ENABLE_SSL |
202 |
if (boa_ssl) { |
203 |
if (ssl_params_refresh < DEFAULT_SSL_PARAMS_REFRESH) { |
204 |
log_error_time(); |
205 |
fprintf(stderr, |
206 |
"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; |
209 |
} |
210 |
alarm(ssl_params_refresh); |
211 |
} |
212 |
#endif |
213 |
|
214 |
select_loop(params); |
215 |
|
216 |
return 0; |
217 |
} |
218 |
|
219 |
server_params *global_server_params; |
220 |
int global_server_params_size = 0; |
221 |
|
222 |
#ifdef ENABLE_HIC |
223 |
hic_params *global_hic_params = NULL; |
224 |
int global_hic_params_size = 0; |
225 |
#endif |
226 |
|
227 |
/* This function will return a server_params pointer. This |
228 |
* pointer is to be used as a pointer to the select loop. |
229 |
*/ |
230 |
static server_params *smp_init(socket_type server_s[2]) |
231 |
{ |
232 |
int i; |
233 |
server_params *params; |
234 |
|
235 |
#ifdef ENABLE_SMP |
236 |
pthread_t tid; |
237 |
int max_threads = max_server_threads; |
238 |
|
239 |
father_id = pthread_self(); |
240 |
#else |
241 |
const int max_threads = 1; |
242 |
#endif |
243 |
|
244 |
params = malloc(sizeof(server_params) * max_threads); |
245 |
if (params == NULL) { |
246 |
log_error_time(); |
247 |
fprintf(stderr, "Could not allocate memory.\n"); |
248 |
exit(1); |
249 |
} |
250 |
|
251 |
for (i = 0; i < max_threads; i++) { |
252 |
params[i].server_s[0] = server_s[0]; |
253 |
params[i].server_s[1] = server_s[1]; |
254 |
params[i].request_ready = NULL; |
255 |
params[i].request_block = NULL; |
256 |
params[i].request_free = NULL; |
257 |
|
258 |
/* for signal handling */ |
259 |
params[i].sighup_flag = 0; |
260 |
params[i].sigchld_flag = 0; |
261 |
params[i].sigalrm_flag = 0; |
262 |
params[i].sigusr1_flag = 0; |
263 |
params[i].sigterm_flag = 0; |
264 |
|
265 |
params[i].sockbufsize = SOCKETBUF_SIZE; |
266 |
|
267 |
params[i].status.requests = 0; |
268 |
params[i].status.errors = 0; |
269 |
|
270 |
params[i].total_connections = 0; |
271 |
params[i].max_fd = 0; |
272 |
|
273 |
params[i].handle_sigbus = 0; |
274 |
} |
275 |
|
276 |
#ifdef ENABLE_SMP |
277 |
params[0].tid = father_id; |
278 |
|
279 |
for (i = 1; i < max_threads; i++) { |
280 |
if (pthread_create(&tid, NULL, &select_loop, ¶ms[i]) != 0) { |
281 |
log_error_time(); |
282 |
fprintf(stderr, "Could not dispatch threads.\n"); |
283 |
exit(1); |
284 |
} |
285 |
params[i].tid = tid; |
286 |
} |
287 |
#endif |
288 |
|
289 |
if (max_threads > 1) { |
290 |
log_error_time(); |
291 |
fprintf(stderr, |
292 |
"%s: Dispatched %d HTTP server threads.\n", SERVER_NAME, |
293 |
max_threads); |
294 |
} |
295 |
|
296 |
global_server_params_size = max_threads; |
297 |
global_server_params = params; |
298 |
|
299 |
return ¶ms[0]; |
300 |
} |
301 |
|
302 |
void smp_reinit() |
303 |
{ |
304 |
#ifdef ENABLE_SMP |
305 |
int i; |
306 |
server_params *params = global_server_params; |
307 |
int max_threads = max_server_threads; |
308 |
#else |
309 |
int max_threads = 1; |
310 |
#endif |
311 |
|
312 |
if (global_server_params_size < max_threads) { |
313 |
log_error_time(); |
314 |
fprintf(stderr, "Cannot increase threads on runtime.\n"); |
315 |
max_threads = global_server_params_size; |
316 |
} |
317 |
#ifdef ENABLE_SMP |
318 |
for (i = 1; i < max_threads; i++) { |
319 |
pthread_t tid; |
320 |
if (pthread_create(&tid, NULL, &select_loop, ¶ms[i]) != 0) { |
321 |
log_error_time(); |
322 |
fprintf(stderr, "Could not dispatch threads.\n"); |
323 |
exit(1); |
324 |
} |
325 |
params[i].tid = tid; |
326 |
} |
327 |
#endif |
328 |
|
329 |
if (max_threads > 0) { |
330 |
log_error_time(); |
331 |
fprintf(stderr, "Regenerated a pool of %d threads.\n", max_threads); |
332 |
} |
333 |
|
334 |
return; |
335 |
} |
336 |
|
337 |
#ifdef ENABLE_HIC |
338 |
|
339 |
pthread_t hic_tid; |
340 |
|
341 |
/* This function will return a server_params pointer. This |
342 |
* pointer is to be used as a pointer to the select loop. |
343 |
*/ |
344 |
void hic_init() |
345 |
{ |
346 |
hic_params *params = global_hic_params; |
347 |
int i; |
348 |
#ifdef ENABLE_SMP |
349 |
pthread_t tid; |
350 |
#endif |
351 |
|
352 |
if (max_hic_threads == 0) |
353 |
return; |
354 |
|
355 |
#ifdef ENABLE_SMP |
356 |
|
357 |
if (global_hic_params_size > 0 |
358 |
&& global_hic_params_size != max_hic_threads) { |
359 |
log_error_time(); |
360 |
fprintf(stderr, |
361 |
"Cannot change the HIC threads number on runtime.\n"); |
362 |
max_hic_threads = global_hic_params_size; |
363 |
} else { |
364 |
/* first time.. Allocate memory */ |
365 |
params = calloc(1, sizeof(hic_params) * max_hic_threads); |
366 |
if (params == NULL) { |
367 |
log_error_time(); |
368 |
fprintf(stderr, |
369 |
"Could not allocate memory for HIC parameters.\n"); |
370 |
exit(1); |
371 |
} |
372 |
|
373 |
for (i = 0; i < max_hic_threads; i++) { /* initialize mutexes */ |
374 |
pthread_mutex_init(¶ms[i].lock, NULL); |
375 |
} |
376 |
|
377 |
global_hic_params = params; |
378 |
global_hic_params_size = max_hic_threads; |
379 |
|
380 |
} |
381 |
|
382 |
for (i = 0; i < max_hic_threads; i++) { |
383 |
if (pthread_create(&tid, NULL, &hic_main_loop, ¶ms[i]) != 0) { |
384 |
log_error_time(); |
385 |
fprintf(stderr, "Could not dispatch hic thread.\n"); |
386 |
exit(1); |
387 |
} |
388 |
params[i].tid = tid; |
389 |
} |
390 |
|
391 |
log_error_time(); |
392 |
fprintf(stderr, |
393 |
"%s: Dispatched %d HIC threads.\n", SERVER_NAME, |
394 |
max_hic_threads); |
395 |
|
396 |
#endif |
397 |
|
398 |
return; |
399 |
} |
400 |
|
401 |
#endif /* ENABLE_HIC */ |
402 |
|
403 |
static socket_type create_server_socket(int port, int secure) |
404 |
{ |
405 |
socket_type server_s; |
406 |
|
407 |
server_s.secure = secure; |
408 |
server_s.port = port; |
409 |
|
410 |
server_s.socket = socket(SERVER_AF, SOCK_STREAM, IPPROTO_TCP); |
411 |
if (server_s.socket == -1) { |
412 |
DIE("unable to create socket"); |
413 |
} |
414 |
|
415 |
/* server socket is nonblocking */ |
416 |
if (set_nonblock_fd(server_s.socket) == -1) { |
417 |
DIE("fcntl: unable to set server socket to nonblocking"); |
418 |
} |
419 |
|
420 |
/* close server socket on exec so cgi's can't write to it */ |
421 |
if (fcntl(server_s.socket, F_SETFD, 1) == -1) { |
422 |
DIE("can't set close-on-exec on server socket!"); |
423 |
} |
424 |
|
425 |
/* reuse socket addr */ |
426 |
if ((setsockopt |
427 |
(server_s.socket, SOL_SOCKET, SO_REUSEADDR, (void *) &sock_opt, |
428 |
sizeof(sock_opt))) == -1) { |
429 |
DIE("setsockopt"); |
430 |
} |
431 |
|
432 |
/* internet family-specific code encapsulated in bind_server() */ |
433 |
if (bind_server(server_s.socket, server_ip, port) == -1) { |
434 |
DIE("unable to bind"); |
435 |
} |
436 |
|
437 |
/* listen: large number just in case your kernel is nicely tweaked */ |
438 |
if (listen(server_s.socket, backlog) == -1) { |
439 |
DIE("unable to listen"); |
440 |
} |
441 |
return server_s; |
442 |
} |
443 |
|
444 |
static void drop_privs(void) |
445 |
{ |
446 |
/* give away our privs if we can */ |
447 |
if (getuid() == 0) { |
448 |
struct passwd *passwdbuf; |
449 |
passwdbuf = getpwuid(server_uid); |
450 |
if (passwdbuf == NULL) { |
451 |
DIE("getpwuid"); |
452 |
} |
453 |
if (initgroups(passwdbuf->pw_name, passwdbuf->pw_gid) == -1) { |
454 |
DIE("initgroups"); |
455 |
} |
456 |
if (setgid(server_gid) == -1) { |
457 |
DIE("setgid"); |
458 |
} |
459 |
if (setuid(server_uid) == -1) { |
460 |
DIE("setuid"); |
461 |
} |
462 |
/* test for failed-but-return-was-successful setuid |
463 |
* http://www.securityportal.com/list-archive/bugtraq/2000/Jun/0101.html |
464 |
*/ |
465 |
if (setuid(0) != -1) { |
466 |
DIE("icky Linux kernel bug!"); |
467 |
} |
468 |
} else { |
469 |
if (server_gid || server_uid) { |
470 |
log_error_time(); |
471 |
fprintf(stderr, "Warning: " |
472 |
"Not running as root: no attempt to change" |
473 |
" to uid %d gid %d\n", server_uid, server_gid); |
474 |
} |
475 |
server_gid = getgid(); |
476 |
server_uid = getuid(); |
477 |
} |
478 |
} |
479 |
|
480 |
/* |
481 |
* Name: fixup_server_root |
482 |
* |
483 |
* Description: Makes sure the server root is valid. |
484 |
* |
485 |
*/ |
486 |
|
487 |
static void fixup_server_root() |
488 |
{ |
489 |
char *dirbuf; |
490 |
|
491 |
if (!server_root) { |
492 |
#ifdef SERVER_ROOT |
493 |
server_root = strdup(SERVER_ROOT); |
494 |
if (!server_root) { |
495 |
perror("strdup (SERVER_ROOT)"); |
496 |
exit(1); |
497 |
} |
498 |
#else |
499 |
fputs(SERVER_NAME |
500 |
": don't know where server root is. Please #define " |
501 |
"SERVER_ROOT in defines.h\n" |
502 |
"and recompile, or use the -c command line option to " |
503 |
"specify it.\n", stderr); |
504 |
exit(1); |
505 |
#endif |
506 |
} |
507 |
|
508 |
if (chdir(server_root) == -1) { |
509 |
fprintf(stderr, "Could not chdir to \"%s\": aborting\n", |
510 |
server_root); |
511 |
exit(1); |
512 |
} |
513 |
|
514 |
dirbuf = normalize_path(server_root); |
515 |
free(server_root); |
516 |
server_root = dirbuf; |
517 |
} |
518 |
|
519 |
char boa_tls_version[64] = "\0"; |
520 |
char boa_version[] = "Server: "SERVER_NAME"/"SERVER_VERSION"\r\n"; |
521 |
|
522 |
static void create_server_names() |
523 |
{ |
524 |
#ifdef ENABLE_SSL |
525 |
if ( boa_tls_version[0] == 0) { |
526 |
strcpy( boa_tls_version, "Server: "SERVER_NAME"/"SERVER_VERSION" GnuTLS/"); |
527 |
strcat( boa_tls_version, gnutls_check_version(NULL)); |
528 |
strcat( boa_tls_version, "\r\n"); |
529 |
} |
530 |
#endif |
531 |
} |
532 |
|
533 |
#ifdef HAVE_GETRLIMIT |
534 |
|
535 |
#ifndef RLIMIT_NOFILE |
536 |
# define RLIMIT_NOFILE RLIMIT_OFILE |
537 |
#endif |
538 |
|
539 |
#define SET_MAX_CON( lim) \ |
540 |
if (lim == RLIM_INFINITY) { \ |
541 |
max_connections = INT_MAX; \ |
542 |
} else { \ |
543 |
max_connections = lim; \ |
544 |
} |
545 |
|
546 |
static void initialize_rlimits( ) |
547 |
{ |
548 |
int c; |
549 |
struct rlimit rl; |
550 |
|
551 |
if (max_connections < 1) { |
552 |
/* has not been set explicitly */ |
553 |
c = getrlimit(RLIMIT_NOFILE, &rl); |
554 |
if (c < 0) { |
555 |
perror("getrlimit"); |
556 |
exit(1); |
557 |
} |
558 |
SET_MAX_CON( rl.rlim_cur); |
559 |
#ifdef HAVE_SETRLIMIT |
560 |
if (rl.rlim_max > rl.rlim_cur) { |
561 |
rl.rlim_cur = rl.rlim_max; |
562 |
c = setrlimit(RLIMIT_NOFILE, &rl); |
563 |
if (c < 0) { |
564 |
perror("setrlimit:"); |
565 |
} else { |
566 |
SET_MAX_CON( rl.rlim_max); |
567 |
fprintf(stderr, "%s: Increasing max open files from %ld to %ld.\n", |
568 |
SERVER_NAME, (long int)rl.rlim_cur, max_connections); |
569 |
} |
570 |
} |
571 |
#endif |
572 |
} |
573 |
} |
574 |
|
575 |
#else /* rlimits are not present */ |
576 |
static void initialize_rlimits( ) |
577 |
{ |
578 |
if (max_connections < 1) |
579 |
max_connections = INT_MAX; |
580 |
return; |
581 |
} |
582 |
#endif |