2.88
httpd.c
1/* snac - A simple, minimalistic ActivityPub instance */
2/* copyright (c) 2022 - 2026 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_http.h"
10#include "xs_httpd.h"
11#include "xs_mime.h"
12#include "xs_time.h"
13#include "xs_openssl.h"
14#include "xs_fcgi.h"
15#include "xs_html.h"
16#include "xs_webmention.h"
17
18#include "snac.h"
19
20#include <setjmp.h>
21#include <pthread.h>
22#include <semaphore.h>
23#include <fcntl.h>
24#include <stdint.h>
25
26#include <sys/resource.h> // for getrlimit()
27
28#include <sys/mman.h>
29
30#ifdef USE_POLL_FOR_SLEEP
31#include <poll.h>
32#endif
33
34/** server state **/
35srv_state *p_state = NULL;
36
37
38/** job control **/
39
40/* mutex to access the lists of jobs */
41static pthread_mutex_t job_mutex;
42
43/* semaphore to trigger job processing */
44static sem_t *job_sem;
45
46typedef struct job_fifo_item {
47 struct job_fifo_item *next;
48 xs_val *job;
49} job_fifo_item;
50
51static job_fifo_item *job_fifo_first = NULL;
52static job_fifo_item *job_fifo_last = NULL;
53
54
55/** other global data **/
56
57static jmp_buf on_break;
58
59
60/** code **/
61
62/* nodeinfo 2.0 template */
63const char * const nodeinfo_2_0_template = ""
64 "{\"version\":\"2.0\","
65 "\"software\":{\"name\":\"snac\",\"version\":\"" VERSION "\"},"
66 "\"protocols\":[\"activitypub\"],"
67 "\"services\":{\"outbound\":[],\"inbound\":[]},"
68 "\"usage\":{\"users\":{\"total\":%d,\"activeMonth\":%d,\"activeHalfyear\":%d},"
69 "\"localPosts\":%d},"
70 "\"openRegistrations\":false,\"metadata\":{"
71 "\"nodeDescription\":\"%s\",\"nodeName\":\"%s\""
72 "}}";
73
74xs_str *nodeinfo_2_0(void)
75/* builds a nodeinfo json object */
76{
77 int n_utotal = 0;
78 int n_umonth = 0;
79 int n_uhyear = 0;
80 int n_posts = 0;
81 xs *users = user_list();
82 xs_list *p = users;
83 const char *v;
84 double now = (double)time(NULL);
85
86 while (xs_list_iter(&p, &v)) {
87 /* build the full path name to the last usage log */
88 xs *llfn = xs_fmt("%s/user/%s/lastlog.txt", srv_basedir, v);
89 double llsecs = now - mtime(llfn);
90
91 if (llsecs < 60 * 60 * 24 * 30 * 6) {
92 n_uhyear++;
93
94 if (llsecs < 60 * 60 * 24 * 30)
95 n_umonth++;
96 }
97
98 n_utotal++;
99
100 /* build the file to each user public.idx */
101 xs *pidxfn = xs_fmt("%s/user/%s/public.idx", srv_basedir, v);
102 n_posts += index_len(pidxfn);
103 }
104
105 const char *name = xs_dict_get_def(srv_config, "title", "");
106 const char *desc = xs_dict_get_def(srv_config, "short_description", "");
107
108 return xs_fmt(nodeinfo_2_0_template, n_utotal, n_umonth, n_uhyear, n_posts, desc, name);
109}
110
111
112static xs_str *greeting_html(void)
113/* processes and returns greeting.html */
114{
115 /* try to open greeting.html */
116 xs *fn = xs_fmt("%s/greeting.html", srv_basedir);
117 FILE *f;
118 xs_str *s = NULL;
119
120 if ((f = fopen(fn, "r")) != NULL) {
121 s = xs_readall(f);
122 fclose(f);
123
124 /* replace %host% */
125 s = xs_replace_i(s, "%host%", xs_dict_get(srv_config, "host"));
126
127 const char *adm_email = xs_dict_get(srv_config, "admin_email");
128 if (xs_is_null(adm_email) || *adm_email == '\0')
129 adm_email = "the administrator of this instance";
130
131 /* replace %admin_email */
132 s = xs_replace_i(s, "%admin_email%", adm_email);
133
134 /* does it have a %userlist% mark? */
135 if (xs_str_in(s, "%userlist%") != -1) {
136 const char *host = xs_dict_get(srv_config, "host");
137 xs *list = user_list();
138 xs_list *p = list;
139 const xs_str *uid;
140
141 xs_html *ul = xs_html_tag("ul",
142 xs_html_attr("class", "snac-user-list"));
143
144 p = list;
145 while (xs_list_iter(&p, &uid)) {
146 snac user;
147
148 if (strcmp(uid, "relay") && user_open(&user, uid)) {
149 xs *formatted_name = format_text_with_emoji(NULL, xs_dict_get(user.config, "name"), 1, NULL);
150
151 xs_html_add(ul,
152 xs_html_tag("li",
153 xs_html_tag("a",
154 xs_html_attr("href", user.actor),
155 xs_html_text("@"),
156 xs_html_text(uid),
157 xs_html_text("@"),
158 xs_html_text(host),
159 xs_html_text(" ("),
160 xs_html_raw(formatted_name),
161 xs_html_text(")"))));
162
163 user_free(&user);
164 }
165 }
166
167 xs *s1 = xs_html_render(ul);
168 s = xs_replace_i(s, "%userlist%", s1);
169 }
170 }
171
172 return s;
173}
174
175
176const char * const share_page = ""
177"<!DOCTYPE html>\n"
178"<html>\n"
179"<head>\n"
180"<title>%s - snac</title>\n"
181"<meta content=\"width=device-width, initial-scale=1, minimum-scale=1, user-scalable=no\" name=\"viewport\">\n"
182"<link rel=\"stylesheet\" type=\"text/css\" href=\"%s/style.css\"/>\n"
183"<style>:root {color-scheme: light dark}</style>\n"
184"</head>\n"
185"<body><h1>%s link share</h1>\n"
186"<form method=\"get\" action=\"%s/share-bridge\">\n"
187"<textarea name=\"content\" rows=\"6\" wrap=\"virtual\" required=\"required\" style=\"width: 50em\">%s</textarea>\n"
188"<p>Login: <input type=\"text\" name=\"login\" autocapitalize=\"off\" required=\"required\"></p>\n"
189"<input type=\"submit\" value=\"OK\">\n"
190"</form><p>%s</p></body></html>\n"
191"";
192
193
194const char * const authorize_interaction_page = ""
195"<!DOCTYPE html>\n"
196"<html>\n"
197"<head>\n"
198"<title>%s - snac</title>\n"
199"<meta content=\"width=device-width, initial-scale=1, minimum-scale=1, user-scalable=no\" name=\"viewport\">\n"
200"<link rel=\"stylesheet\" type=\"text/css\" href=\"%s/style.css\"/>\n"
201"<style>:root {color-scheme: light dark}</style>\n"
202"</head>\n"
203"<body><h1>%s authorize interaction</h1>\n"
204"<form method=\"get\" action=\"%s/auth-int-bridge\">\n"
205"<select name=\"action\">\n"
206"<option value=\"Follow\">Follow</option>\n"
207"<option value=\"Boost\">Boost</option>\n"
208"<option value=\"Like\">Like</option>\n"
209"</select> %s\n"
210"<input type=\"hidden\" name=\"id\" value=\"%s\">\n"
211"<p>Login: <input type=\"text\" name=\"login\" autocapitalize=\"off\" required=\"required\"></p>\n"
212"<input type=\"submit\" value=\"OK\">\n"
213"</form><p>%s</p></body></html>\n"
214"";
215
216
217int server_get_handler(xs_dict *req, const char *q_path,
218 char **body, int *b_size, char **ctype)
219/* basic server services */
220{
221 int status = 0;
222
223 const snac *user = NULL;
224
225 /* is it the server root? */
226 if (*q_path == '\0' || strcmp(q_path, "/") == 0) {
227 const xs_dict *q_vars = xs_dict_get(req, "q_vars");
228 const char *t = NULL;
229
230 if (xs_type(q_vars) == XSTYPE_DICT && xs_is_string(t = xs_dict_get(q_vars, "t"))) {
231 /** search by tag **/
232 int skip = 0;
233 int show = xs_number_get(xs_dict_get_def(srv_config, "def_timeline_entries",
234 xs_dict_get_def(srv_config, "max_timeline_entries", "50")));
235 const char *v;
236
237 if ((v = xs_dict_get(q_vars, "skip")) != NULL)
238 skip = atoi(v);
239 if ((v = xs_dict_get(q_vars, "show")) != NULL)
240 show = atoi(v);
241
242 xs *tl = tag_search(t, skip, show + 1);
243 int more = 0;
244 if (xs_list_len(tl) >= show + 1) {
245 /* drop the last one */
246 tl = xs_list_del(tl, -1);
247 more = 1;
248 }
249
250 const char *accept = xs_dict_get(req, "accept");
251 if (!xs_is_null(accept) && strcmp(accept, "application/rss+xml") == 0) {
252 xs *link = xs_fmt("%s/?t=%s", srv_baseurl, t);
253
254 *body = rss_from_timeline(NULL, tl, link, link, link);
255 *ctype = "application/rss+xml; charset=utf-8";
256 }
257 else {
258 xs *page = xs_fmt("?t=%s", t);
259 xs *title = xs_fmt(L("Search results for tag #%s"), t);
260 *body = html_timeline(NULL, tl, 0, skip, show, more, title, page, 0, NULL, 0);
261 }
262 }
263 else
264 if (xs_type(xs_dict_get(srv_config, "show_instance_timeline")) == XSTYPE_TRUE) {
265 /** instance timeline **/
266 xs *tl = timeline_instance_list(0, 30);
267 *body = html_timeline(NULL, tl, 0, 0, 0, 0,
268 L("Recent posts by users in this instance"), NULL, 0, NULL, 0);
269 }
270 else
271 *body = greeting_html();
272
273 if (*body)
274 status = HTTP_STATUS_OK;
275 }
276 else
277 if (strcmp(q_path, "/susie.png") == 0 || strcmp(q_path, "/favicon.ico") == 0 ) {
278 status = HTTP_STATUS_OK;
279 *body = xs_base64_dec(default_avatar_base64(), b_size);
280 *ctype = "image/png";
281 }
282 else
283 if (strcmp(q_path, "/.well-known/nodeinfo") == 0) {
284 status = HTTP_STATUS_OK;
285 *ctype = "application/json; charset=utf-8";
286 *body = xs_fmt("{\"links\":["
287 "{\"rel\":\"http:/" "/nodeinfo.diaspora.software/ns/schema/2.0\",\"href\":\"%s/nodeinfo_2_0\"},"
288 "{\"rel\":\"http:/" "/nodeinfo.diaspora.software/ns/schema/2.1\",\"href\":\"%s/nodeinfo_2_1\"}"
289 "]}",
290 srv_baseurl, srv_baseurl);
291 }
292 else
293 if (strcmp(q_path, "/.well-known/host-meta") == 0) {
294 status = HTTP_STATUS_OK;
295 *ctype = "application/xrd+xml";
296 *body = xs_fmt("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
297 "<XRD>"
298 "<Link rel=\"lrdd\" type=\"application/xrd+xml\" template=\"https://%s/.well-known/webfinger?resource={uri}\"/>"
299 "</XRD>", xs_dict_get(srv_config, "host"));
300 }
301 else
302 if (strcmp(q_path, "/nodeinfo_2_0") == 0) {
303 status = HTTP_STATUS_OK;
304 *ctype = "application/json; charset=utf-8";
305 *body = nodeinfo_2_0();
306 }
307 else
308 if (strcmp(q_path, "/nodeinfo_2_1") == 0) {
309 xs *s = nodeinfo_2_0();
310 xs *j = xs_json_loads(s);
311
312 j = xs_dict_set(j, "version", "2.1");
313 j = xs_dict_set_path(j, "software.repository", WHAT_IS_SNAC_URL);
314 j = xs_dict_set_path(j, "software.homepage", SNAC_DOC_URL);
315
316 status = HTTP_STATUS_OK;
317 *ctype = "application/json; charset=utf-8";
318 *body = xs_json_dumps(j, 4);
319 }
320 else
321 if (strcmp(q_path, "/robots.txt") == 0) {
322 status = HTTP_STATUS_OK;
323 *ctype = "text/plain";
324 *body = xs_str_new("User-agent: *\n"
325 "Disallow: /\n");
326 }
327 else
328 if (strcmp(q_path, "/style.css") == 0) {
329 FILE *f;
330 xs *css_fn = xs_fmt("%s/style.css", srv_basedir);
331
332 if ((f = fopen(css_fn, "r")) != NULL) {
333 *body = xs_readall(f);
334 fclose(f);
335
336 status = HTTP_STATUS_OK;
337 *ctype = "text/css";
338 }
339 }
340 else
341 if (strcmp(q_path, "/share") == 0) {
342 const xs_dict *q_vars = xs_dict_get(req, "q_vars");
343 const char *url = xs_dict_get(q_vars, "url");
344 const char *text = xs_dict_get(q_vars, "text");
345 xs *s = NULL;
346
347 if (xs_type(text) == XSTYPE_STRING) {
348 if (xs_type(url) == XSTYPE_STRING)
349 s = xs_fmt("%s:\n\n%s\n", text, url);
350 else
351 s = xs_fmt("%s\n", text);
352 }
353 else
354 if (xs_type(url) == XSTYPE_STRING)
355 s = xs_fmt("%s\n", url);
356 else
357 s = xs_str_new(NULL);
358
359 status = HTTP_STATUS_OK;
360 *ctype = "text/html; charset=utf-8";
361 *body = xs_fmt(share_page,
362 xs_dict_get(srv_config, "host"),
363 srv_baseurl,
364 xs_dict_get(srv_config, "host"),
365 srv_baseurl,
366 s,
367 USER_AGENT
368 );
369 }
370 else
371 if (strcmp(q_path, "/authorize_interaction") == 0) {
372 const xs_dict *q_vars = xs_dict_get(req, "q_vars");
373 const char *uri = xs_dict_get(q_vars, "uri");
374
375 if (xs_is_string(uri)) {
376 status = HTTP_STATUS_OK;
377 *ctype = "text/html; charset=utf-8";
378 *body = xs_fmt(authorize_interaction_page,
379 xs_dict_get(srv_config, "host"),
380 srv_baseurl,
381 xs_dict_get(srv_config, "host"),
382 srv_baseurl,
383 uri,
384 uri,
385 USER_AGENT
386 );
387 }
388 }
389
390 if (status != 0)
391 srv_debug(1, xs_fmt("server_get_handler serving '%s' %d", q_path, status));
392
393 return status;
394}
395
396
397int server_post_handler(const xs_dict *req, const char *q_path,
398 char *payload, int p_size,
399 char **body, int *b_size, char **ctype)
400{
401 int status = 0;
402
403 (void)payload;
404 (void)p_size;
405 (void)body;
406 (void)b_size;
407 (void)ctype;
408
409 if (strcmp(q_path, "/webmention-hook") == 0) {
410 status = HTTP_STATUS_BAD_REQUEST;
411
412 const xs_dict *p_vars = xs_dict_get(req, "p_vars");
413
414 if (!xs_is_dict(p_vars))
415 return status;
416
417 const char *source = xs_dict_get(p_vars, "source");
418 const char *target = xs_dict_get(p_vars, "target");
419
420 if (!xs_is_string(source) || !xs_is_string(target)) {
421 srv_debug(1, xs_fmt("webmention-hook bad source or target"));
422 return status;
423 }
424
425 if (!xs_startswith(target, srv_baseurl)) {
426 srv_debug(1, xs_fmt("webmention-hook unknown target %s", target));
427 return status;
428 }
429
430 /* get the user */
431 xs *s1 = xs_replace(target, srv_baseurl, "");
432
433 xs *l1 = xs_split(s1, "/");
434 const char *uid = xs_list_get(l1, 1);
435 snac user;
436
437 if (!xs_is_string(uid) || !user_open(&user, uid)) {
438 srv_debug(1, xs_fmt("webmention-hook cannot find user for %s", target));
439 return status;
440 }
441
442 int r = xs_webmention_hook(source, target, USER_AGENT);
443
444 if (r > 0) {
445 notify_add(&user, "Webmention", NULL, source, target, xs_stock(XSTYPE_DICT));
446 timeline_touch(&user);
447 }
448
449 srv_log(xs_fmt("webmention-hook source=%s target=%s %d", source, target, r));
450
451 user_free(&user);
452 status = HTTP_STATUS_OK;
453 }
454
455 return status;
456}
457
458
459void httpd_connection(FILE *f)
460/* the connection processor */
461{
462 xs *req;
463 const char *method;
464 int status = 0;
465 xs_str *body = NULL;
466 int b_size = 0;
467 char *ctype = NULL;
468 xs *headers = xs_dict_new();
469 xs *q_path = NULL;
470 xs *payload = NULL;
471 xs *etag = NULL;
472 xs *last_modified = NULL;
473 xs *link = NULL;
474 int p_size = 0;
475 const char *p;
476 int fcgi_id;
477
478 if (p_state->use_fcgi)
479 req = xs_fcgi_request(f, &payload, &p_size, &fcgi_id);
480 else
481 req = xs_httpd_request(f, &payload, &p_size);
482
483 if (req == NULL) {
484 /* probably because a timeout */
485 fclose(f);
486 return;
487 }
488
489 if (!(method = xs_dict_get(req, "method")) || !(p = xs_dict_get(req, "path"))) {
490 /* missing needed headers; discard */
491 fclose(f);
492 return;
493 }
494
495 q_path = xs_dup(p);
496
497 /* crop the q_path from leading / and the prefix */
498 if (xs_endswith(q_path, "/"))
499 q_path = xs_crop_i(q_path, 0, -1);
500
501 p = xs_dict_get(srv_config, "prefix");
502 if (xs_startswith(q_path, p))
503 q_path = xs_crop_i(q_path, strlen(p), 0);
504
505 if (strcmp(method, "GET") == 0 || strcmp(method, "HEAD") == 0) {
506 /* cascade through */
507 if (status == 0)
508 status = server_get_handler(req, q_path, &body, &b_size, &ctype);
509
510 if (status == 0)
511 status = webfinger_get_handler(req, q_path, &body, &b_size, &ctype);
512
513 if (status == 0)
514 status = activitypub_get_handler(req, q_path, &body, &b_size, &ctype);
515
516#ifndef NO_MASTODON_API
517 if (status == 0)
518 status = oauth_get_handler(req, q_path, &body, &b_size, &ctype);
519
520 if (status == 0)
521 status = mastoapi_get_handler(req, q_path, &body, &b_size, &ctype, &link);
522#endif /* NO_MASTODON_API */
523
524 if (status == 0)
525 status = html_get_handler(req, q_path, &body, &b_size, &ctype, &etag, &last_modified);
526 }
527 else
528 if (strcmp(method, "POST") == 0) {
529
530 if (status == 0)
531 status = server_post_handler(req, q_path,
532 payload, p_size, &body, &b_size, &ctype);
533
534#ifndef NO_MASTODON_API
535 if (status == 0)
536 status = oauth_post_handler(req, q_path,
537 payload, p_size, &body, &b_size, &ctype);
538
539 if (status == 0)
540 status = mastoapi_post_handler(req, q_path,
541 payload, p_size, &body, &b_size, &ctype);
542#endif
543
544 if (status == 0)
545 status = activitypub_post_handler(req, q_path,
546 payload, p_size, &body, &b_size, &ctype);
547
548 if (status == 0)
549 status = html_post_handler(req, q_path,
550 payload, p_size, &body, &b_size, &ctype);
551 }
552 else
553 if (strcmp(method, "PUT") == 0) {
554
555#ifndef NO_MASTODON_API
556 if (status == 0)
557 status = mastoapi_put_handler(req, q_path,
558 payload, p_size, &body, &b_size, &ctype);
559#endif
560
561 }
562 else
563 if (strcmp(method, "PATCH") == 0) {
564
565#ifndef NO_MASTODON_API
566 if (status == 0)
567 status = mastoapi_patch_handler(req, q_path,
568 payload, p_size, &body, &b_size, &ctype);
569#endif
570
571 }
572 else
573 if (strcmp(method, "OPTIONS") == 0) {
574 const char *methods = "OPTIONS, GET, HEAD, POST, PUT, DELETE";
575 headers = xs_dict_append(headers, "allow", methods);
576 headers = xs_dict_append(headers, "access-control-allow-methods", methods);
577 status = HTTP_STATUS_OK;
578 }
579 else
580 if (strcmp(method, "DELETE") == 0) {
581#ifndef NO_MASTODON_API
582 if (status == 0)
583 status = mastoapi_delete_handler(req, q_path,
584 payload, p_size, &body, &b_size, &ctype);
585#endif
586 }
587
588 /* unattended? it's an error */
589 if (status == 0) {
590 srv_archive_error("unattended_method", "unattended method", req, payload);
591 srv_debug(1, xs_fmt("httpd_connection unattended %s %s", method, q_path));
592 status = HTTP_STATUS_NOT_FOUND;
593 }
594
595 if (status == HTTP_STATUS_FORBIDDEN)
596 body = xs_str_new("<h1>403 Forbidden (" USER_AGENT ")</h1>");
597
598 if (status == HTTP_STATUS_NOT_FOUND)
599 body = xs_str_new("<h1>404 Not Found (" USER_AGENT ")</h1>");
600
601 if (status == HTTP_STATUS_GONE)
602 body = xs_str_new("<h1>410 Gone (" USER_AGENT ")</h1>");
603
604 if (status == HTTP_STATUS_BAD_REQUEST && body != NULL)
605 body = xs_str_new("<h1>400 Bad Request (" USER_AGENT ")</h1>");
606
607 if (status == HTTP_STATUS_SEE_OTHER)
608 headers = xs_dict_append(headers, "location", body);
609
610 if (status == HTTP_STATUS_UNAUTHORIZED && body) {
611 xs *www_auth = xs_fmt("Basic realm=\"@%s@%s snac login\"",
612 body, xs_dict_get(srv_config, "host"));
613
614 headers = xs_dict_append(headers, "WWW-Authenticate", www_auth);
615 headers = xs_dict_append(headers, "Cache-Control", "no-cache, must-revalidate, max-age=0");
616 }
617
618 if (ctype == NULL)
619 ctype = "text/html; charset=utf-8";
620
621 headers = xs_dict_append(headers, "content-type", ctype);
622 headers = xs_dict_append(headers, "x-creator", USER_AGENT);
623
624 if (!xs_is_null(etag))
625 headers = xs_dict_append(headers, "etag", etag);
626 if (!xs_is_null(last_modified))
627 headers = xs_dict_append(headers, "last-modified", last_modified);
628 if (!xs_is_null(link))
629 headers = xs_dict_append(headers, "Link", link);
630
631 /* if there are any additional headers, add them */
632 const xs_dict *more_headers = xs_dict_get(srv_config, "http_headers");
633 if (xs_type(more_headers) == XSTYPE_DICT) {
634 const char *k, *v;
635 int c = 0;
636 while (xs_dict_next(more_headers, &k, &v, &c))
637 headers = xs_dict_set(headers, k, v);
638 }
639
640 if (b_size == 0 && body != NULL)
641 b_size = strlen(body);
642
643 /* if it was a HEAD, no body will be sent */
644 if (strcmp(method, "HEAD") == 0)
645 body = xs_free(body);
646
647 headers = xs_dict_append(headers, "access-control-allow-origin", "*");
648 headers = xs_dict_append(headers, "access-control-allow-headers", "*");
649 headers = xs_dict_append(headers, "access-control-expose-headers", "Link");
650
651 /* disable any form of fucking JavaScript */
652 headers = xs_dict_append(headers, "Content-Security-Policy", "script-src ;");
653
654 if (p_state->use_fcgi)
655 xs_fcgi_response(f, status, headers, body, b_size, fcgi_id);
656 else
657 xs_httpd_response(f, status, xs_http_status_text(status), headers, body, b_size);
658
659 fclose(f);
660
661 srv_archive("RECV", NULL, req, payload, p_size, status, headers, body, b_size);
662
663 /* JSON validation check */
664 if (!xs_is_null(body) && strcmp(ctype, "application/json") == 0) {
665 xs *j = xs_json_loads(body);
666
667 if (j == NULL) {
668 srv_log(xs_fmt("bad JSON"));
669 srv_archive_error("bad_json", "bad JSON", req, body);
670 }
671 }
672
673 xs_free(body);
674}
675
676
677void job_post(const xs_val *job, int urgent)
678/* posts a job for the threads to process it */
679{
680 if (job != NULL) {
681 /* lock the mutex */
682 pthread_mutex_lock(&job_mutex);
683
684 job_fifo_item *i = xs_realloc(NULL, sizeof(job_fifo_item));
685 *i = (job_fifo_item){ NULL, xs_dup(job) };
686
687 if (job_fifo_first == NULL)
688 job_fifo_first = job_fifo_last = i;
689 else
690 if (urgent) {
691 /* prepend */
692 i->next = job_fifo_first;
693 job_fifo_first = i;
694 }
695 else {
696 /* append */
697 job_fifo_last->next = i;
698 job_fifo_last = i;
699 }
700
701 p_state->job_fifo_size++;
702
703 if (p_state->job_fifo_size > p_state->peak_job_fifo_size)
704 p_state->peak_job_fifo_size = p_state->job_fifo_size;
705
706 /* unlock the mutex */
707 pthread_mutex_unlock(&job_mutex);
708
709 /* ask for someone to attend it */
710 sem_post(job_sem);
711 }
712}
713
714
715void job_wait(xs_val **job)
716/* waits for an available job */
717{
718 *job = NULL;
719
720 if (sem_wait(job_sem) == 0) {
721 /* lock the mutex */
722 pthread_mutex_lock(&job_mutex);
723
724 /* dequeue */
725 job_fifo_item *i = job_fifo_first;
726
727 if (i != NULL) {
728 job_fifo_first = i->next;
729
730 if (job_fifo_first == NULL)
731 job_fifo_last = NULL;
732
733 *job = i->job;
734 xs_free(i);
735
736 p_state->job_fifo_size--;
737 }
738
739 /* unlock the mutex */
740 pthread_mutex_unlock(&job_mutex);
741 }
742}
743
744
745static void *job_thread(void *arg)
746/* job thread */
747{
748 int pid = (int)(uintptr_t)arg;
749
750 srv_debug(1, xs_fmt("job thread %d started", pid));
751
752 for (;;) {
753 xs *job = NULL;
754
755 p_state->th_state[pid] = THST_WAIT;
756
757 job_wait(&job);
758
759 if (job == NULL) /* corrupted message? */
760 continue;
761
762 if (xs_type(job) == XSTYPE_FALSE) /* special message: exit */
763 break;
764 else
765 if (xs_type(job) == XSTYPE_DATA) {
766 /* it's a socket */
767 FILE *f = NULL;
768
769 p_state->th_state[pid] = THST_IN;
770
771 xs_data_get(&f, job);
772
773 if (f != NULL)
774 httpd_connection(f);
775 }
776 else {
777 /* it's a q_item */
778 p_state->th_state[pid] = THST_QUEUE;
779
780 process_queue_item(job);
781 }
782 }
783
784 p_state->th_state[pid] = THST_STOP;
785
786 srv_debug(1, xs_fmt("job thread %d stopped", pid));
787
788 return NULL;
789}
790
791/* background thread sleep control */
792static pthread_mutex_t sleep_mutex;
793static pthread_cond_t sleep_cond;
794
795static void *background_thread(void *arg)
796/* background thread (queue management and other things) */
797{
798 time_t t, purge_time, rss_time;
799
800 (void)arg;
801
802 t = time(NULL);
803
804 /* first purge time */
805 purge_time = t + 10 * 60;
806
807 /* first RSS polling time */
808 rss_time = t + 15 * 60;
809
810 srv_log(xs_fmt("background thread started"));
811
812 enqueue_fsck();
813
814 while (p_state->srv_running) {
815 int cnt = 0;
816
817 p_state->th_state[0] = THST_QUEUE;
818
819 {
820 xs *list = user_list();
821 const char *uid;
822
823 /* process queues for all users */
824 xs_list_foreach(list, uid) {
825 snac user;
826
827 if (user_open(&user, uid)) {
828 cnt += process_user_queue(&user);
829 user_free(&user);
830 }
831 }
832 }
833
834 /* global queue */
835 cnt += process_queue();
836
837 t = time(NULL);
838
839 /* time to purge? */
840 if (t > purge_time) {
841 /* next purge time is tomorrow */
842 purge_time = t + 24 * 60 * 60;
843
844 xs *q_item = xs_dict_new();
845 q_item = xs_dict_append(q_item, "type", "purge");
846 job_post(q_item, 0);
847 }
848
849 /* time to poll the RSS? */
850 if (t > rss_time) {
851 /* next RSS poll time */
852 int hours = xs_number_get(xs_dict_get_def(srv_config, "rss_hashtag_poll_hours", "4"));
853
854 /* don't hammer servers too much */
855 if (hours < 1)
856 hours = 1;
857
858 rss_time = t + 60 * 60 * hours;
859
860 xs *q_item = xs_dict_new();
861 q_item = xs_dict_append(q_item, "type", "rss_hashtag_poll");
862 job_post(q_item, 0);
863 }
864
865 if (cnt == 0) {
866 /* sleep 3 seconds */
867
868 p_state->th_state[0] = THST_WAIT;
869
870#ifdef USE_POLL_FOR_SLEEP
871 poll(NULL, 0, 3 * 1000);
872#else
873 struct timespec ts;
874
875 clock_gettime(CLOCK_REALTIME, &ts);
876 ts.tv_sec += 3;
877
878 pthread_mutex_lock(&sleep_mutex);
879 while (pthread_cond_timedwait(&sleep_cond, &sleep_mutex, &ts) == 0);
880 pthread_mutex_unlock(&sleep_mutex);
881#endif
882 }
883 }
884
885 p_state->th_state[0] = THST_STOP;
886
887 srv_log(xs_fmt("background thread stopped"));
888
889 return NULL;
890}
891
892
893void term_handler(int s)
894{
895 (void)s;
896
897 longjmp(on_break, 1);
898}
899
900
901srv_state *srv_state_op(xs_str **fname, int op)
902/* opens or deletes the shared memory object */
903{
904 int fd;
905 srv_state *ss = NULL;
906
907 if (*fname == NULL)
908 *fname = xs_fmt("/%s_snac_state", xs_dict_get(srv_config, "host"));
909
910 switch (op) {
911 case 0: /* open for writing */
912
913#ifdef WITHOUT_SHM
914
915 errno = ENOTSUP;
916
917#else
918
919 if ((fd = shm_open(*fname, O_CREAT | O_RDWR, 0666)) != -1) {
920 ftruncate(fd, sizeof(*ss));
921
922 if ((ss = mmap(0, sizeof(*ss), PROT_READ | PROT_WRITE,
923 MAP_SHARED, fd, 0)) == MAP_FAILED)
924 ss = NULL;
925
926 close(fd);
927 }
928
929#endif
930
931 if (ss == NULL) {
932 /* shared memory error: just create a plain structure */
933 srv_log(xs_fmt("warning: shm object error (%s)", strerror(errno)));
934 ss = malloc(sizeof(*ss));
935 }
936
937 /* init structure */
938 *ss = (srv_state){0};
939 ss->s_size = sizeof(*ss);
940
941 break;
942
943 case 1: /* open for reading */
944
945#ifdef WITHOUT_SHM
946
947 errno = ENOTSUP;
948
949#else
950
951 if ((fd = shm_open(*fname, O_RDONLY, 0666)) != -1) {
952 if ((ss = mmap(0, sizeof(*ss), PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED)
953 ss = NULL;
954
955 close(fd);
956 }
957
958#endif
959
960 if (ss == NULL) {
961 /* shared memory error */
962 srv_log(xs_fmt("error: shm object error (%s) server not running?", strerror(errno)));
963 }
964 else
965 if (ss->s_size != sizeof(*ss)) {
966 srv_log(xs_fmt("error: struct size mismatch (%d != %d)",
967 ss->s_size, sizeof(*ss)));
968
969 munmap(ss, sizeof(*ss));
970
971 ss = NULL;
972 }
973
974 break;
975
976 case 2: /* unlink */
977
978#ifndef WITHOUT_SHM
979
980 if (*fname)
981 shm_unlink(*fname);
982
983#endif
984
985 break;
986 }
987
988 return ss;
989}
990
991
992void httpd(void)
993/* starts the server */
994{
995 const char *address = NULL;
996 const char *port = NULL;
997 xs *full_address = NULL;
998 int rs;
999 pthread_t threads[MAX_THREADS] = {0};
1000 int n;
1001 xs *sem_name = NULL;
1002 xs *shm_name = NULL;
1003 sem_t anon_job_sem;
1004 xs *pidfile = xs_fmt("%s/server.pid", srv_basedir);
1005 int pidfd;
1006
1007 {
1008 /* do some pidfile locking acrobatics */
1009 if ((pidfd = open(pidfile, O_RDWR | O_CREAT, 0660)) == -1) {
1010 srv_log(xs_fmt("Cannot create pidfile %s -- cannot continue", pidfile));
1011 return;
1012 }
1013
1014 if (lockf(pidfd, F_TLOCK, 1) == -1) {
1015 srv_log(xs_fmt("Cannot lock pidfile %s -- server already running?", pidfile));
1016 close(pidfd);
1017 return;
1018 }
1019
1020 ftruncate(pidfd, 0);
1021
1022 xs *s = xs_fmt("%d\n", (int)getpid());
1023 write(pidfd, s, strlen(s));
1024 }
1025
1026 address = xs_dict_get(srv_config, "address");
1027
1028 if (*address == '/') {
1029 rs = xs_unix_socket_server(address, NULL);
1030 full_address = xs_fmt("unix:%s", address);
1031 }
1032 else {
1033 port = xs_number_str(xs_dict_get(srv_config, "port"));
1034 full_address = xs_fmt("%s:%s", address, port);
1035
1036 rs = xs_socket_server(address, port);
1037 }
1038
1039 if (rs == -1) {
1040 srv_log(xs_fmt("cannot bind socket to %s", full_address));
1041 return;
1042 }
1043
1044 /* setup the server stat structure */
1045 p_state = srv_state_op(&shm_name, 0);
1046
1047 p_state->srv_start_time = time(NULL);
1048
1049 p_state->use_fcgi = xs_type(xs_dict_get(srv_config, "fastcgi")) == XSTYPE_TRUE;
1050
1051 p_state->srv_running = 1;
1052
1053 signal(SIGPIPE, SIG_IGN);
1054 signal(SIGTERM, term_handler);
1055 signal(SIGINT, term_handler);
1056
1057 srv_log(xs_fmt("httpd%s start %s %s", p_state->use_fcgi ? " (FastCGI)" : "",
1058 full_address, USER_AGENT));
1059
1060 /* show the number of usable file descriptors */
1061 struct rlimit r;
1062 getrlimit(RLIMIT_NOFILE, &r);
1063 srv_debug(1, xs_fmt("available (rlimit) fds: %d (cur) / %d (max)",
1064 (int) r.rlim_cur, (int) r.rlim_max));
1065
1066 /* initialize the job control engine */
1067 pthread_mutex_init(&job_mutex, NULL);
1068 sem_name = xs_fmt("/job_%d", getpid());
1069 job_sem = sem_open(sem_name, O_CREAT, 0644, 0);
1070
1071 if (job_sem == NULL) {
1072 /* error opening a named semaphore; try with an anonymous one */
1073 if (sem_init(&anon_job_sem, 0, 0) != -1)
1074 job_sem = &anon_job_sem;
1075 }
1076
1077 if (job_sem == NULL) {
1078 srv_log(xs_fmt("fatal error: cannot create semaphore -- cannot continue"));
1079 return;
1080 }
1081
1082 /* initialize sleep control */
1083 pthread_mutex_init(&sleep_mutex, NULL);
1084 pthread_cond_init(&sleep_cond, NULL);
1085
1086 p_state->n_threads = xs_number_get(xs_dict_get(srv_config, "num_threads"));
1087
1088#ifdef _SC_NPROCESSORS_ONLN
1089 if (p_state->n_threads == 0) {
1090 /* get number of CPUs on the machine */
1091 p_state->n_threads = sysconf(_SC_NPROCESSORS_ONLN);
1092 }
1093#endif
1094
1095 if (p_state->n_threads < 4)
1096 p_state->n_threads = 4;
1097
1098 if (p_state->n_threads > MAX_THREADS)
1099 p_state->n_threads = MAX_THREADS;
1100
1101 srv_debug(0, xs_fmt("using %d threads", p_state->n_threads));
1102
1103 /* thread #0 is the background thread */
1104 pthread_create(&threads[0], NULL, background_thread, NULL);
1105
1106 /* the rest of threads are for job processing */
1107 char *ptr = (char *) 0x1;
1108 for (n = 1; n < p_state->n_threads; n++)
1109 pthread_create(&threads[n], NULL, job_thread, ptr++);
1110
1111 if (setjmp(on_break) == 0) {
1112 for (;;) {
1113 int cs = xs_socket_accept(rs);
1114
1115 if (cs != -1) {
1116 FILE *f = fdopen(cs, "r+");
1117 xs *job = xs_data_new(&f, sizeof(FILE *));
1118 job_post(job, 1);
1119 }
1120 else
1121 break;
1122 }
1123 }
1124
1125 p_state->srv_running = 0;
1126
1127 /* send as many exit jobs as working threads */
1128 for (n = 1; n < p_state->n_threads; n++)
1129 job_post(xs_stock(XSTYPE_FALSE), 0);
1130
1131 /* wait for all the threads to exit */
1132 for (n = 0; n < p_state->n_threads; n++)
1133 pthread_join(threads[n], NULL);
1134
1135 sem_close(job_sem);
1136 sem_unlink(sem_name);
1137
1138 srv_state_op(&shm_name, 2);
1139
1140 xs *uptime = xs_str_time_diff(time(NULL) - p_state->srv_start_time);
1141
1142 srv_log(xs_fmt("httpd%s stop %s (run time: %s)",
1143 p_state->use_fcgi ? " (FastCGI)" : "",
1144 full_address, uptime));
1145
1146 unlink(pidfile);
1147}
