2.67
httpd.c
1/* snac - A simple, minimalistic ActivityPub instance */
2/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
3
4#include "xs.h"
5#include "xs_io.h"
6#include "xs_json.h"
7#include "xs_socket.h"
8#include "xs_unix_socket.h"
9#include "xs_httpd.h"
10#include "xs_mime.h"
11#include "xs_time.h"
12#include "xs_openssl.h"
13#include "xs_fcgi.h"
14#include "xs_html.h"
15
16#include "snac.h"
17
18#include <setjmp.h>
19#include <pthread.h>
20#include <semaphore.h>
21#include <fcntl.h>
22#include <stdint.h>
23
24#include <sys/resource.h> // for getrlimit()
25
26#include <sys/mman.h>
27
28#ifdef USE_POLL_FOR_SLEEP
29#include <poll.h>
30#endif
31
32/** server state **/
33srv_state *p_state = NULL;
34
35
36/** job control **/
37
38/* mutex to access the lists of jobs */
39static pthread_mutex_t job_mutex;
40
41/* semaphore to trigger job processing */
42static sem_t *job_sem;
43
44typedef struct job_fifo_item {
45 struct job_fifo_item *next;
46 xs_val *job;
47} job_fifo_item;
48
49static job_fifo_item *job_fifo_first = NULL;
50static job_fifo_item *job_fifo_last = NULL;
51
52
53/** other global data **/
54
55static jmp_buf on_break;
56
57
58/** code **/
59
60/* nodeinfo 2.0 template */
61const char *nodeinfo_2_0_template = ""
62 "{\"version\":\"2.0\","
63 "\"software\":{\"name\":\"snac\",\"version\":\"" VERSION "\"},"
64 "\"protocols\":[\"activitypub\"],"
65 "\"services\":{\"outbound\":[],\"inbound\":[]},"
66 "\"usage\":{\"users\":{\"total\":%d,\"activeMonth\":%d,\"activeHalfyear\":%d},"
67 "\"localPosts\":%d},"
68 "\"openRegistrations\":false,\"metadata\":{}}";
69
70xs_str *nodeinfo_2_0(void)
71/* builds a nodeinfo json object */
72{
73 int n_utotal = 0;
74 int n_umonth = 0;
75 int n_uhyear = 0;
76 int n_posts = 0;
77 xs *users = user_list();
78 xs_list *p = users;
79 const char *v;
80 double now = (double)time(NULL);
81
82 while (xs_list_iter(&p, &v)) {
83 /* build the full path name to the last usage log */
84 xs *llfn = xs_fmt("%s/user/%s/lastlog.txt", srv_basedir, v);
85 double llsecs = now - mtime(llfn);
86
87 if (llsecs < 60 * 60 * 24 * 30 * 6) {
88 n_uhyear++;
89
90 if (llsecs < 60 * 60 * 24 * 30)
91 n_umonth++;
92 }
93
94 n_utotal++;
95
96 /* build the file to each user public.idx */
97 xs *pidxfn = xs_fmt("%s/user/%s/public.idx", srv_basedir, v);
98 n_posts += index_len(pidxfn);
99 }
100
101 return xs_fmt(nodeinfo_2_0_template, n_utotal, n_umonth, n_uhyear, n_posts);
102}
103
104
105static xs_str *greeting_html(void)
106/* processes and returns greeting.html */
107{
108 /* try to open greeting.html */
109 xs *fn = xs_fmt("%s/greeting.html", srv_basedir);
110 FILE *f;
111 xs_str *s = NULL;
112
113 if ((f = fopen(fn, "r")) != NULL) {
114 s = xs_readall(f);
115 fclose(f);
116
117 /* replace %host% */
118 s = xs_replace_i(s, "%host%", xs_dict_get(srv_config, "host"));
119
120 const char *adm_email = xs_dict_get(srv_config, "admin_email");
121 if (xs_is_null(adm_email) || *adm_email == '\0')
122 adm_email = "the administrator of this instance";
123
124 /* replace %admin_email */
125 s = xs_replace_i(s, "%admin_email%", adm_email);
126
127 /* does it have a %userlist% mark? */
128 if (xs_str_in(s, "%userlist%") != -1) {
129 const char *host = xs_dict_get(srv_config, "host");
130 xs *list = user_list();
131 xs_list *p = list;
132 const xs_str *uid;
133
134 xs_html *ul = xs_html_tag("ul",
135 xs_html_attr("class", "snac-user-list"));
136
137 p = list;
138 while (xs_list_iter(&p, &uid)) {
139 snac user;
140
141 if (user_open(&user, uid)) {
142 xs_html_add(ul,
143 xs_html_tag("li",
144 xs_html_tag("a",
145 xs_html_attr("href", user.actor),
146 xs_html_text("@"),
147 xs_html_text(uid),
148 xs_html_text("@"),
149 xs_html_text(host),
150 xs_html_text(" ("),
151 xs_html_text(xs_dict_get(user.config, "name")),
152 xs_html_text(")"))));
153
154 user_free(&user);
155 }
156 }
157
158 xs *s1 = xs_html_render(ul);
159 s = xs_replace_i(s, "%userlist%", s1);
160 }
161 }
162
163 return s;
164}
165
166
167int server_get_handler(xs_dict *req, const char *q_path,
168 char **body, int *b_size, char **ctype)
169/* basic server services */
170{
171 int status = 0;
172
173 /* is it the server root? */
174 if (*q_path == '\0') {
175 const xs_dict *q_vars = xs_dict_get(req, "q_vars");
176 const char *t = NULL;
177
178 if (xs_type(q_vars) == XSTYPE_DICT && (t = xs_dict_get(q_vars, "t"))) {
179 /** search by tag **/
180 int skip = 0;
181 int show = xs_number_get(xs_dict_get(srv_config, "max_timeline_entries"));
182 const char *v;
183
184 if ((v = xs_dict_get(q_vars, "skip")) != NULL)
185 skip = atoi(v);
186 if ((v = xs_dict_get(q_vars, "show")) != NULL)
187 show = atoi(v);
188
189 xs *tl = tag_search(t, skip, show + 1);
190 int more = 0;
191 if (xs_list_len(tl) >= show + 1) {
192 /* drop the last one */
193 tl = xs_list_del(tl, -1);
194 more = 1;
195 }
196
197 const char *accept = xs_dict_get(req, "accept");
198 if (!xs_is_null(accept) && strcmp(accept, "application/rss+xml") == 0) {
199 xs *link = xs_fmt("%s/?t=%s", srv_baseurl, t);
200
201 *body = timeline_to_rss(NULL, tl, link, link, link);
202 *ctype = "application/rss+xml; charset=utf-8";
203 }
204 else {
205 xs *page = xs_fmt("?t=%s", t);
206 xs *title = xs_fmt(L("Search results for tag #%s"), t);
207 *body = html_timeline(NULL, tl, 0, skip, show, more, title, page, 0, NULL);
208 }
209 }
210 else
211 if (xs_type(xs_dict_get(srv_config, "show_instance_timeline")) == XSTYPE_TRUE) {
212 /** instance timeline **/
213 xs *tl = timeline_instance_list(0, 30);
214 *body = html_timeline(NULL, tl, 0, 0, 0, 0,
215 L("Recent posts by users in this instance"), NULL, 0, NULL);
216 }
217 else
218 *body = greeting_html();
219
220 if (*body)
221 status = HTTP_STATUS_OK;
222 }
223 else
224 if (strcmp(q_path, "/susie.png") == 0 || strcmp(q_path, "/favicon.ico") == 0 ) {
225 status = HTTP_STATUS_OK;
226 *body = xs_base64_dec(default_avatar_base64(), b_size);
227 *ctype = "image/png";
228 }
229 else
230 if (strcmp(q_path, "/.well-known/nodeinfo") == 0) {
231 status = HTTP_STATUS_OK;
232 *ctype = "application/json; charset=utf-8";
233 *body = xs_fmt("{\"links\":["
234 "{\"rel\":\"http:/" "/nodeinfo.diaspora.software/ns/schema/2.0\","
235 "\"href\":\"%s/nodeinfo_2_0\"}]}",
236 srv_baseurl);
237 }
238 else
239 if (strcmp(q_path, "/.well-known/host-meta") == 0) {
240 status = HTTP_STATUS_OK;
241 *ctype = "application/xrd+xml";
242 *body = xs_fmt("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
243 "<XRD>"
244 "<Link rel=\"lrdd\" type=\"application/xrd+xml\" template=\"https://%s/.well-known/webfinger?resource={uri}\"/>"
245 "</XRD>", xs_dict_get(srv_config, "host"));
246 }
247 else
248 if (strcmp(q_path, "/nodeinfo_2_0") == 0) {
249 status = HTTP_STATUS_OK;
250 *ctype = "application/json; charset=utf-8";
251 *body = nodeinfo_2_0();
252 }
253 else
254 if (strcmp(q_path, "/robots.txt") == 0) {
255 status = HTTP_STATUS_OK;
256 *ctype = "text/plain";
257 *body = xs_str_new("User-agent: *\n"
258 "Disallow: /\n");
259 }
260
261 if (status != 0)
262 srv_debug(1, xs_fmt("server_get_handler serving '%s' %d", q_path, status));
263
264 return status;
265}
266
267
268void httpd_connection(FILE *f)
269/* the connection processor */
270{
271 xs *req;
272 const char *method;
273 int status = 0;
274 xs_str *body = NULL;
275 int b_size = 0;
276 char *ctype = NULL;
277 xs *headers = xs_dict_new();
278 xs *q_path = NULL;
279 xs *payload = NULL;
280 xs *etag = NULL;
281 xs *last_modified = NULL;
282 xs *link = NULL;
283 int p_size = 0;
284 const char *p;
285 int fcgi_id;
286
287 if (p_state->use_fcgi)
288 req = xs_fcgi_request(f, &payload, &p_size, &fcgi_id);
289 else
290 req = xs_httpd_request(f, &payload, &p_size);
291
292 if (req == NULL) {
293 /* probably because a timeout */
294 fclose(f);
295 return;
296 }
297
298 if (!(method = xs_dict_get(req, "method")) || !(p = xs_dict_get(req, "path"))) {
299 /* missing needed headers; discard */
300 fclose(f);
301 return;
302 }
303
304 q_path = xs_dup(p);
305
306 /* crop the q_path from leading / and the prefix */
307 if (xs_endswith(q_path, "/"))
308 q_path = xs_crop_i(q_path, 0, -1);
309
310 p = xs_dict_get(srv_config, "prefix");
311 if (xs_startswith(q_path, p))
312 q_path = xs_crop_i(q_path, strlen(p), 0);
313
314 if (strcmp(method, "GET") == 0 || strcmp(method, "HEAD") == 0) {
315 /* cascade through */
316 if (status == 0)
317 status = server_get_handler(req, q_path, &body, &b_size, &ctype);
318
319 if (status == 0)
320 status = webfinger_get_handler(req, q_path, &body, &b_size, &ctype);
321
322 if (status == 0)
323 status = activitypub_get_handler(req, q_path, &body, &b_size, &ctype);
324
325#ifndef NO_MASTODON_API
326 if (status == 0)
327 status = oauth_get_handler(req, q_path, &body, &b_size, &ctype);
328
329 if (status == 0)
330 status = mastoapi_get_handler(req, q_path, &body, &b_size, &ctype, &link);
331#endif /* NO_MASTODON_API */
332
333 if (status == 0)
334 status = html_get_handler(req, q_path, &body, &b_size, &ctype, &etag, &last_modified);
335 }
336 else
337 if (strcmp(method, "POST") == 0) {
338
339#ifndef NO_MASTODON_API
340 if (status == 0)
341 status = oauth_post_handler(req, q_path,
342 payload, p_size, &body, &b_size, &ctype);
343
344 if (status == 0)
345 status = mastoapi_post_handler(req, q_path,
346 payload, p_size, &body, &b_size, &ctype);
347#endif
348
349 if (status == 0)
350 status = activitypub_post_handler(req, q_path,
351 payload, p_size, &body, &b_size, &ctype);
352
353 if (status == 0)
354 status = html_post_handler(req, q_path,
355 payload, p_size, &body, &b_size, &ctype);
356 }
357 else
358 if (strcmp(method, "PUT") == 0) {
359
360#ifndef NO_MASTODON_API
361 if (status == 0)
362 status = mastoapi_put_handler(req, q_path,
363 payload, p_size, &body, &b_size, &ctype);
364#endif
365
366 }
367 else
368 if (strcmp(method, "PATCH") == 0) {
369
370#ifndef NO_MASTODON_API
371 if (status == 0)
372 status = mastoapi_patch_handler(req, q_path,
373 payload, p_size, &body, &b_size, &ctype);
374#endif
375
376 }
377 else
378 if (strcmp(method, "OPTIONS") == 0) {
379 const char *methods = "OPTIONS, GET, HEAD, POST, PUT, DELETE";
380 headers = xs_dict_append(headers, "allow", methods);
381 headers = xs_dict_append(headers, "access-control-allow-methods", methods);
382 status = HTTP_STATUS_OK;
383 }
384 else
385 if (strcmp(method, "DELETE") == 0) {
386#ifndef NO_MASTODON_API
387 if (status == 0)
388 status = mastoapi_delete_handler(req, q_path,
389 payload, p_size, &body, &b_size, &ctype);
390#endif
391 }
392
393 /* unattended? it's an error */
394 if (status == 0) {
395 srv_archive_error("unattended_method", "unattended method", req, payload);
396 srv_debug(1, xs_fmt("httpd_connection unattended %s %s", method, q_path));
397 status = HTTP_STATUS_NOT_FOUND;
398 }
399
400 if (status == HTTP_STATUS_FORBIDDEN)
401 body = xs_str_new("<h1>403 Forbidden</h1>");
402
403 if (status == HTTP_STATUS_NOT_FOUND)
404 body = xs_str_new("<h1>404 Not Found</h1>");
405
406 if (status == HTTP_STATUS_BAD_REQUEST && body != NULL)
407 body = xs_str_new("<h1>400 Bad Request</h1>");
408
409 if (status == HTTP_STATUS_SEE_OTHER)
410 headers = xs_dict_append(headers, "location", body);
411
412 if (status == HTTP_STATUS_UNAUTHORIZED && body) {
413 xs *www_auth = xs_fmt("Basic realm=\"@%s@%s snac login\"",
414 body, xs_dict_get(srv_config, "host"));
415
416 headers = xs_dict_append(headers, "WWW-Authenticate", www_auth);
417 headers = xs_dict_append(headers, "Cache-Control", "no-cache, must-revalidate, max-age=0");
418 }
419
420 if (ctype == NULL)
421 ctype = "text/html; charset=utf-8";
422
423 headers = xs_dict_append(headers, "content-type", ctype);
424 headers = xs_dict_append(headers, "x-creator", USER_AGENT);
425
426 if (!xs_is_null(etag))
427 headers = xs_dict_append(headers, "etag", etag);
428 if (!xs_is_null(last_modified))
429 headers = xs_dict_append(headers, "last-modified", last_modified);
430 if (!xs_is_null(link))
431 headers = xs_dict_append(headers, "Link", link);
432
433 /* if there are any additional headers, add them */
434 const xs_dict *more_headers = xs_dict_get(srv_config, "http_headers");
435 if (xs_type(more_headers) == XSTYPE_DICT) {
436 const char *k, *v;
437 int c = 0;
438 while (xs_dict_next(more_headers, &k, &v, &c))
439 headers = xs_dict_set(headers, k, v);
440 }
441
442 if (b_size == 0 && body != NULL)
443 b_size = strlen(body);
444
445 /* if it was a HEAD, no body will be sent */
446 if (strcmp(method, "HEAD") == 0)
447 body = xs_free(body);
448
449 headers = xs_dict_append(headers, "access-control-allow-origin", "*");
450 headers = xs_dict_append(headers, "access-control-allow-headers", "*");
451
452 if (p_state->use_fcgi)
453 xs_fcgi_response(f, status, headers, body, b_size, fcgi_id);
454 else
455 xs_httpd_response(f, status, http_status_text(status), headers, body, b_size);
456
457 fclose(f);
458
459 srv_archive("RECV", NULL, req, payload, p_size, status, headers, body, b_size);
460
461 /* JSON validation check */
462 if (!xs_is_null(body) && strcmp(ctype, "application/json") == 0) {
463 xs *j = xs_json_loads(body);
464
465 if (j == NULL) {
466 srv_log(xs_fmt("bad JSON"));
467 srv_archive_error("bad_json", "bad JSON", req, body);
468 }
469 }
470
471 xs_free(body);
472}
473
474
475void job_post(const xs_val *job, int urgent)
476/* posts a job for the threads to process it */
477{
478 if (job != NULL) {
479 /* lock the mutex */
480 pthread_mutex_lock(&job_mutex);
481
482 job_fifo_item *i = xs_realloc(NULL, sizeof(job_fifo_item));
483 *i = (job_fifo_item){ NULL, xs_dup(job) };
484
485 if (job_fifo_first == NULL)
486 job_fifo_first = job_fifo_last = i;
487 else
488 if (urgent) {
489 /* prepend */
490 i->next = job_fifo_first;
491 job_fifo_first = i;
492 }
493 else {
494 /* append */
495 job_fifo_last->next = i;
496 job_fifo_last = i;
497 }
498
499 p_state->job_fifo_size++;
500
501 if (p_state->job_fifo_size > p_state->peak_job_fifo_size)
502 p_state->peak_job_fifo_size = p_state->job_fifo_size;
503
504 /* unlock the mutex */
505 pthread_mutex_unlock(&job_mutex);
506
507 /* ask for someone to attend it */
508 sem_post(job_sem);
509 }
510}
511
512
513void job_wait(xs_val **job)
514/* waits for an available job */
515{
516 *job = NULL;
517
518 if (sem_wait(job_sem) == 0) {
519 /* lock the mutex */
520 pthread_mutex_lock(&job_mutex);
521
522 /* dequeue */
523 job_fifo_item *i = job_fifo_first;
524
525 if (i != NULL) {
526 job_fifo_first = i->next;
527
528 if (job_fifo_first == NULL)
529 job_fifo_last = NULL;
530
531 *job = i->job;
532 xs_free(i);
533
534 p_state->job_fifo_size--;
535 }
536
537 /* unlock the mutex */
538 pthread_mutex_unlock(&job_mutex);
539 }
540}
541
542
543static void *job_thread(void *arg)
544/* job thread */
545{
546 int pid = (int)(uintptr_t)arg;
547
548 srv_debug(1, xs_fmt("job thread %d started", pid));
549
550 for (;;) {
551 xs *job = NULL;
552
553 p_state->th_state[pid] = THST_WAIT;
554
555 job_wait(&job);
556
557 if (job == NULL) /* corrupted message? */
558 continue;
559
560 if (xs_type(job) == XSTYPE_FALSE) /* special message: exit */
561 break;
562 else
563 if (xs_type(job) == XSTYPE_DATA) {
564 /* it's a socket */
565 FILE *f = NULL;
566
567 p_state->th_state[pid] = THST_IN;
568
569 xs_data_get(&f, job);
570
571 if (f != NULL)
572 httpd_connection(f);
573 }
574 else {
575 /* it's a q_item */
576 p_state->th_state[pid] = THST_QUEUE;
577
578 process_queue_item(job);
579 }
580 }
581
582 p_state->th_state[pid] = THST_STOP;
583
584 srv_debug(1, xs_fmt("job thread %d stopped", pid));
585
586 return NULL;
587}
588
589/* background thread sleep control */
590static pthread_mutex_t sleep_mutex;
591static pthread_cond_t sleep_cond;
592
593static void *background_thread(void *arg)
594/* background thread (queue management and other things) */
595{
596 time_t purge_time;
597
598 (void)arg;
599
600 /* first purge time */
601 purge_time = time(NULL) + 10 * 60;
602
603 srv_log(xs_fmt("background thread started"));
604
605 while (p_state->srv_running) {
606 time_t t;
607 int cnt = 0;
608
609 p_state->th_state[0] = THST_QUEUE;
610
611 {
612 xs *list = user_list();
613 char *p;
614 const char *uid;
615
616 /* process queues for all users */
617 p = list;
618 while (xs_list_iter(&p, &uid)) {
619 snac snac;
620
621 if (user_open(&snac, uid)) {
622 cnt += process_user_queue(&snac);
623 user_free(&snac);
624 }
625 }
626 }
627
628 /* global queue */
629 cnt += process_queue();
630
631 /* time to purge? */
632 if ((t = time(NULL)) > purge_time) {
633 /* next purge time is tomorrow */
634 purge_time = t + 24 * 60 * 60;
635
636 xs *q_item = xs_dict_new();
637 q_item = xs_dict_append(q_item, "type", "purge");
638 job_post(q_item, 0);
639 }
640
641 if (cnt == 0) {
642 /* sleep 3 seconds */
643
644 p_state->th_state[0] = THST_WAIT;
645
646#ifdef USE_POLL_FOR_SLEEP
647 poll(NULL, 0, 3 * 1000);
648#else
649 struct timespec ts;
650
651 clock_gettime(CLOCK_REALTIME, &ts);
652 ts.tv_sec += 3;
653
654 pthread_mutex_lock(&sleep_mutex);
655 while (pthread_cond_timedwait(&sleep_cond, &sleep_mutex, &ts) == 0);
656 pthread_mutex_unlock(&sleep_mutex);
657#endif
658 }
659 }
660
661 p_state->th_state[0] = THST_STOP;
662
663 srv_log(xs_fmt("background thread stopped"));
664
665 return NULL;
666}
667
668
669void term_handler(int s)
670{
671 (void)s;
672
673 longjmp(on_break, 1);
674}
675
676
677srv_state *srv_state_op(xs_str **fname, int op)
678/* opens or deletes the shared memory object */
679{
680 int fd;
681 srv_state *ss = NULL;
682
683 if (*fname == NULL)
684 *fname = xs_fmt("/%s_snac_state", xs_dict_get(srv_config, "host"));
685
686 switch (op) {
687 case 0: /* open for writing */
688
689#ifdef WITHOUT_SHM
690
691 errno = ENOTSUP;
692
693#else
694
695 if ((fd = shm_open(*fname, O_CREAT | O_RDWR, 0666)) != -1) {
696 ftruncate(fd, sizeof(*ss));
697
698 if ((ss = mmap(0, sizeof(*ss), PROT_READ | PROT_WRITE,
699 MAP_SHARED, fd, 0)) == MAP_FAILED)
700 ss = NULL;
701
702 close(fd);
703 }
704
705#endif
706
707 if (ss == NULL) {
708 /* shared memory error: just create a plain structure */
709 srv_log(xs_fmt("warning: shm object error (%s)", strerror(errno)));
710 ss = malloc(sizeof(*ss));
711 }
712
713 /* init structure */
714 *ss = (srv_state){0};
715 ss->s_size = sizeof(*ss);
716
717 break;
718
719 case 1: /* open for reading */
720
721#ifdef WITHOUT_SHM
722
723 errno = ENOTSUP;
724
725#else
726
727 if ((fd = shm_open(*fname, O_RDONLY, 0666)) != -1) {
728 if ((ss = mmap(0, sizeof(*ss), PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED)
729 ss = NULL;
730
731 close(fd);
732 }
733
734#endif
735
736 if (ss == NULL) {
737 /* shared memory error */
738 srv_log(xs_fmt("error: shm object error (%s) server not running?", strerror(errno)));
739 }
740 else
741 if (ss->s_size != sizeof(*ss)) {
742 srv_log(xs_fmt("error: struct size mismatch (%d != %d)",
743 ss->s_size, sizeof(*ss)));
744
745 munmap(ss, sizeof(*ss));
746
747 ss = NULL;
748 }
749
750 break;
751
752 case 2: /* unlink */
753
754#ifndef WITHOUT_SHM
755
756 if (*fname)
757 shm_unlink(*fname);
758
759#endif
760
761 break;
762 }
763
764 return ss;
765}
766
767
768void httpd(void)
769/* starts the server */
770{
771 const char *address = NULL;
772 const char *port = NULL;
773 xs *full_address = NULL;
774 int rs;
775 pthread_t threads[MAX_THREADS] = {0};
776 int n;
777 xs *sem_name = NULL;
778 xs *shm_name = NULL;
779 sem_t anon_job_sem;
780 xs *pidfile = xs_fmt("%s/server.pid", srv_basedir);
781 int pidfd;
782
783 {
784 /* do some pidfile locking acrobatics */
785 if ((pidfd = open(pidfile, O_RDWR | O_CREAT, 0660)) == -1) {
786 srv_log(xs_fmt("Cannot create pidfile %s -- cannot continue", pidfile));
787 return;
788 }
789
790 if (lockf(pidfd, F_TLOCK, 1) == -1) {
791 srv_log(xs_fmt("Cannot lock pidfile %s -- server already running?", pidfile));
792 close(pidfd);
793 return;
794 }
795
796 ftruncate(pidfd, 0);
797
798 xs *s = xs_fmt("%d\n", (int)getpid());
799 write(pidfd, s, strlen(s));
800 }
801
802 address = xs_dict_get(srv_config, "address");
803
804 if (*address == '/') {
805 rs = xs_unix_socket_server(address, NULL);
806 full_address = xs_fmt("unix:%s", address);
807 }
808 else {
809 port = xs_number_str(xs_dict_get(srv_config, "port"));
810 full_address = xs_fmt("%s:%s", address, port);
811
812 rs = xs_socket_server(address, port);
813 }
814
815 if (rs == -1) {
816 srv_log(xs_fmt("cannot bind socket to %s", full_address));
817 return;
818 }
819
820 /* setup the server stat structure */
821 p_state = srv_state_op(&shm_name, 0);
822
823 p_state->srv_start_time = time(NULL);
824
825 p_state->use_fcgi = xs_type(xs_dict_get(srv_config, "fastcgi")) == XSTYPE_TRUE;
826
827 p_state->srv_running = 1;
828
829 signal(SIGPIPE, SIG_IGN);
830 signal(SIGTERM, term_handler);
831 signal(SIGINT, term_handler);
832
833 srv_log(xs_fmt("httpd%s start %s %s", p_state->use_fcgi ? " (FastCGI)" : "",
834 full_address, USER_AGENT));
835
836 /* show the number of usable file descriptors */
837 struct rlimit r;
838 getrlimit(RLIMIT_NOFILE, &r);
839 srv_debug(1, xs_fmt("available (rlimit) fds: %d (cur) / %d (max)",
840 (int) r.rlim_cur, (int) r.rlim_max));
841
842 /* initialize the job control engine */
843 pthread_mutex_init(&job_mutex, NULL);
844 sem_name = xs_fmt("/job_%d", getpid());
845 job_sem = sem_open(sem_name, O_CREAT, 0644, 0);
846
847 if (job_sem == NULL) {
848 /* error opening a named semaphore; try with an anonymous one */
849 if (sem_init(&anon_job_sem, 0, 0) != -1)
850 job_sem = &anon_job_sem;
851 }
852
853 if (job_sem == NULL) {
854 srv_log(xs_fmt("fatal error: cannot create semaphore -- cannot continue"));
855 return;
856 }
857
858 /* initialize sleep control */
859 pthread_mutex_init(&sleep_mutex, NULL);
860 pthread_cond_init(&sleep_cond, NULL);
861
862 p_state->n_threads = xs_number_get(xs_dict_get(srv_config, "num_threads"));
863
864#ifdef _SC_NPROCESSORS_ONLN
865 if (p_state->n_threads == 0) {
866 /* get number of CPUs on the machine */
867 p_state->n_threads = sysconf(_SC_NPROCESSORS_ONLN);
868 }
869#endif
870
871 if (p_state->n_threads < 4)
872 p_state->n_threads = 4;
873
874 if (p_state->n_threads > MAX_THREADS)
875 p_state->n_threads = MAX_THREADS;
876
877 srv_debug(0, xs_fmt("using %d threads", p_state->n_threads));
878
879 /* thread #0 is the background thread */
880 pthread_create(&threads[0], NULL, background_thread, NULL);
881
882 /* the rest of threads are for job processing */
883 char *ptr = (char *) 0x1;
884 for (n = 1; n < p_state->n_threads; n++)
885 pthread_create(&threads[n], NULL, job_thread, ptr++);
886
887 if (setjmp(on_break) == 0) {
888 for (;;) {
889 int cs = xs_socket_accept(rs);
890
891 if (cs != -1) {
892 FILE *f = fdopen(cs, "r+");
893 xs *job = xs_data_new(&f, sizeof(FILE *));
894 job_post(job, 1);
895 }
896 else
897 break;
898 }
899 }
900
901 p_state->srv_running = 0;
902
903 /* send as many exit jobs as working threads */
904 for (n = 1; n < p_state->n_threads; n++)
905 job_post(xs_stock(XSTYPE_FALSE), 0);
906
907 /* wait for all the threads to exit */
908 for (n = 0; n < p_state->n_threads; n++)
909 pthread_join(threads[n], NULL);
910
911 sem_close(job_sem);
912 sem_unlink(sem_name);
913
914 srv_state_op(&shm_name, 2);
915
916 xs *uptime = xs_str_time_diff(time(NULL) - p_state->srv_start_time);
917
918 srv_log(xs_fmt("httpd%s stop %s (run time: %s)",
919 p_state->use_fcgi ? " (FastCGI)" : "",
920 full_address, uptime));
921
922 unlink(pidfile);
923}
