Commit | Line | Data |
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992ce9ef FT |
1 | /* |
2 | ashd - A Sane HTTP Daemon | |
3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <stdlib.h> | |
20 | #include <stdio.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | #include <errno.h> | |
24 | #include <sys/stat.h> | |
25 | #include <ctype.h> | |
26 | #include <dirent.h> | |
27 | #include <fnmatch.h> | |
28 | ||
29 | #ifdef HAVE_CONFIG_H | |
30 | #include <config.h> | |
31 | #endif | |
32 | #include <utils.h> | |
33 | #include <mt.h> | |
34 | #include <log.h> | |
35 | #include <req.h> | |
36 | #include <proc.h> | |
37 | ||
38 | #define CH_SOCKET 0 | |
39 | #define CH_FORK 1 | |
40 | ||
41 | #define PAT_BASENAME 0 | |
42 | #define PAT_PATHNAME 1 | |
43 | #define PAT_ALL 2 | |
44 | #define PAT_DEFAULT 3 | |
45 | ||
46 | struct config { | |
47 | struct config *next, *prev; | |
48 | char *path; | |
49 | time_t mtime; | |
50 | struct child *children; | |
51 | struct pattern *patterns; | |
52 | }; | |
53 | ||
54 | struct child { | |
55 | struct child *next; | |
56 | char *name; | |
57 | int type; | |
58 | char **argv; | |
59 | int fd; | |
60 | }; | |
61 | ||
62 | struct rule { | |
63 | int type; | |
64 | char *pattern; | |
65 | }; | |
66 | ||
67 | struct pattern { | |
68 | struct pattern *next; | |
69 | char *childnm; | |
70 | struct rule **rules; | |
71 | }; | |
72 | ||
73 | struct config *cflist; | |
74 | ||
75 | static void freechild(struct child *ch) | |
76 | { | |
77 | if(ch->fd != -1) | |
78 | close(ch->fd); | |
79 | if(ch->name != NULL) | |
80 | free(ch->name); | |
81 | if(ch->argv != NULL) | |
82 | freeca(ch->argv); | |
83 | free(ch); | |
84 | } | |
85 | ||
86 | static void freepattern(struct pattern *pat) | |
87 | { | |
88 | struct rule **rule; | |
89 | ||
90 | for(rule = pat->rules; *rule; rule++) { | |
91 | if((*rule)->pattern != NULL) | |
92 | free((*rule)->pattern); | |
93 | free(*rule); | |
94 | } | |
95 | if(pat->childnm != NULL) | |
96 | free(pat->childnm); | |
97 | free(pat); | |
98 | } | |
99 | ||
100 | static void freeconfig(struct config *cf) | |
101 | { | |
102 | struct child *ch, *nch; | |
103 | struct pattern *pat, *npat; | |
104 | ||
105 | if(cf->prev != NULL) | |
106 | cf->prev->next = cf->next; | |
107 | if(cf->next != NULL) | |
108 | cf->next->prev = cf->prev; | |
109 | if(cf == cflist) | |
110 | cflist = cf->next; | |
111 | free(cf->path); | |
112 | for(ch = cf->children; ch != NULL; ch = nch) { | |
113 | nch = ch->next; | |
114 | freechild(ch); | |
115 | } | |
116 | for(pat = cf->patterns; pat != NULL; pat = npat) { | |
117 | npat = pat->next; | |
118 | freepattern(pat); | |
119 | } | |
120 | free(cf); | |
121 | } | |
122 | ||
123 | static struct child *newchild(char *name, int type) | |
124 | { | |
125 | struct child *ch; | |
126 | ||
127 | omalloc(ch); | |
128 | ch->name = sstrdup(name); | |
129 | ch->type = type; | |
130 | ch->fd = -1; | |
131 | return(ch); | |
132 | } | |
133 | ||
134 | static struct child *getchild(struct config *cf, char *name) | |
135 | { | |
136 | struct child *ch; | |
137 | ||
138 | for(ch = cf->children; ch; ch = ch->next) { | |
139 | if(!strcmp(ch->name, name)) | |
140 | break; | |
141 | } | |
142 | return(ch); | |
143 | } | |
144 | ||
145 | static struct rule *newrule(struct pattern *pat) | |
146 | { | |
147 | int i; | |
148 | struct rule *rule; | |
149 | ||
150 | for(i = 0; pat->rules[i]; i++); | |
151 | pat->rules = srealloc(pat->rules, sizeof(*pat->rules) * (i + 2)); | |
152 | rule = pat->rules[i] = smalloc(sizeof(*rule)); | |
153 | pat->rules[i + 1] = NULL; | |
154 | return(rule); | |
155 | } | |
156 | ||
157 | static struct pattern *newpattern(void) | |
158 | { | |
159 | struct pattern *pat; | |
160 | ||
161 | omalloc(pat); | |
162 | pat->rules = szmalloc(sizeof(*pat->rules)); | |
163 | return(pat); | |
164 | } | |
165 | ||
166 | static struct config *readconfig(char *path) | |
167 | { | |
168 | int i; | |
169 | struct config *cf; | |
170 | FILE *s; | |
171 | char line[1024]; | |
172 | char *p, **w; | |
173 | int ind, eof; | |
174 | int lno; | |
175 | int state; | |
176 | int rv; | |
177 | int argc; | |
178 | struct child *child; | |
179 | struct pattern *pat; | |
180 | struct rule *rule; | |
181 | struct stat sb; | |
182 | ||
183 | if(stat(path, &sb)) | |
184 | return(NULL); | |
185 | if((s = fopen(sprintf3("%s/.htrc", path), "r")) == NULL) | |
186 | return(NULL); | |
187 | omalloc(cf); | |
188 | cf->mtime = sb.st_mtime; | |
189 | cf->path = sstrdup(path); | |
190 | eof = 0; | |
191 | state = 0; | |
192 | w = NULL; | |
193 | lno = 0; | |
194 | do { | |
195 | if(fgets(line, sizeof(line), s) == NULL) { | |
196 | eof = 1; | |
197 | line[0] = 0; | |
198 | } | |
199 | lno++; | |
200 | for(p = line; *p; p++) { | |
201 | if(*p == '#') | |
202 | continue; | |
203 | if(!isspace(*p)) | |
204 | break; | |
205 | } | |
206 | ind = isspace(line[0]); | |
207 | w = tokenize(line); | |
208 | argc = calen(w); | |
209 | ||
210 | retry: | |
211 | if(state == 0) { | |
212 | if(ind) { | |
213 | flog(LOG_WARNING, "%s%i: unexpected line indentation in global scope", path, lno); | |
214 | goto next; | |
215 | } else { | |
216 | if(!w[0]) { | |
217 | } else if(!strcmp(w[0], "child")) { | |
218 | if(argc < 2) { | |
219 | flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno); | |
220 | goto next; | |
221 | } | |
222 | child = newchild(w[1], CH_SOCKET); | |
223 | state = 1; | |
224 | } else if(!strcmp(w[0], "fchild")) { | |
225 | if(argc < 2) { | |
226 | flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno); | |
227 | goto next; | |
228 | } | |
229 | child = newchild(w[1], CH_FORK); | |
230 | state = 1; | |
231 | } else if(!strcmp(w[0], "match")) { | |
232 | pat = newpattern(); | |
233 | state = 2; | |
234 | } else { | |
235 | flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]); | |
236 | } | |
237 | } | |
238 | } else if(state == 1) { | |
239 | if(ind) { | |
240 | if(!w[0]) { | |
241 | } else if(!strcmp(w[0], "exec")) { | |
242 | if(argc < 2) { | |
243 | flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", path, lno); | |
244 | goto next; | |
245 | } | |
246 | child->argv = szmalloc(sizeof(*child->argv) * argc); | |
247 | for(i = 0; i < argc - 1; i++) | |
248 | child->argv[i] = sstrdup(w[i + 1]); | |
249 | } else { | |
250 | flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]); | |
251 | } | |
252 | } else { | |
253 | state = 0; | |
254 | if(child->argv == NULL) { | |
255 | flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", path, lno, child->name); | |
256 | freechild(child); | |
257 | goto retry; | |
258 | } | |
259 | child->next = cf->children; | |
260 | cf->children = child; | |
261 | goto retry; | |
262 | } | |
263 | } else if(state == 2) { | |
264 | if(ind) { | |
265 | if(!w[0]) { | |
266 | } else if(!strcmp(w[0], "filename")) { | |
267 | if(argc < 2) { | |
268 | flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", path, lno); | |
269 | goto next; | |
270 | } | |
271 | rule = newrule(pat); | |
272 | rule->type = PAT_BASENAME; | |
273 | rule->pattern = sstrdup(w[1]); | |
274 | } else if(!strcmp(w[0], "pathname")) { | |
275 | if(argc < 2) { | |
276 | flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", path, lno); | |
277 | goto next; | |
278 | } | |
279 | rule = newrule(pat); | |
280 | rule->type = PAT_PATHNAME; | |
281 | rule->pattern = sstrdup(w[1]); | |
282 | } else if(!strcmp(w[0], "all")) { | |
283 | newrule(pat)->type = PAT_ALL; | |
284 | } else if(!strcmp(w[0], "default")) { | |
285 | newrule(pat)->type = PAT_DEFAULT; | |
286 | } else if(!strcmp(w[0], "handler")) { | |
287 | if(argc < 2) { | |
288 | flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", path, lno); | |
289 | goto next; | |
290 | } | |
291 | if(pat->childnm != NULL) | |
292 | free(pat->childnm); | |
293 | pat->childnm = sstrdup(w[1]); | |
294 | } else { | |
295 | flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]); | |
296 | } | |
297 | } else { | |
298 | state = 0; | |
299 | if(pat->rules[0] == NULL) { | |
300 | flog(LOG_WARNING, "%s:%i: missing rules in match declaration", path, lno); | |
301 | freepattern(pat); | |
302 | goto retry; | |
303 | } | |
304 | if(pat->childnm == NULL) { | |
305 | flog(LOG_WARNING, "%s:%i: missing handler in match declaration", path, lno); | |
306 | freepattern(pat); | |
307 | goto retry; | |
308 | } | |
309 | pat->next = cf->patterns; | |
310 | cf->patterns = pat; | |
311 | goto retry; | |
312 | } | |
313 | } | |
314 | ||
315 | next: | |
316 | freeca(w); | |
317 | w = NULL; | |
318 | } while(!eof); | |
319 | rv = 0; | |
320 | ||
321 | if(w != NULL) | |
322 | freeca(w); | |
323 | fclose(s); | |
324 | return(cf); | |
325 | } | |
326 | ||
327 | static struct config *getconfig(char *path) | |
328 | { | |
329 | struct config *cf; | |
330 | struct stat sb; | |
331 | ||
332 | for(cf = cflist; cf != NULL; cf = cf->next) { | |
333 | if(!strcmp(cf->path, path)) { | |
334 | if(stat(path, &sb)) | |
335 | return(NULL); | |
336 | if(sb.st_mtime != cf->mtime) { | |
337 | freeconfig(cf); | |
338 | break; | |
339 | } | |
340 | return(cf); | |
341 | } | |
342 | } | |
343 | if((cf = readconfig(path)) != NULL) { | |
344 | cf->next = cflist; | |
345 | cflist = cf; | |
346 | } | |
347 | return(cf); | |
348 | } | |
349 | ||
350 | static char *findfile(struct hthead *req, char *nm) | |
351 | { | |
352 | char *p, *p2, *path, *ftmp, *buf, *rv, *p3; | |
353 | struct stat sb; | |
354 | DIR *dir; | |
355 | struct dirent *dent; | |
356 | ||
357 | path = sstrdup("."); | |
358 | p = nm; | |
359 | rv = NULL; | |
360 | while(1) { | |
361 | if((p2 = strchr(p, '/')) == NULL) { | |
362 | } else { | |
363 | *(p2++) = 0; | |
364 | } | |
365 | ||
366 | if(!*p) { | |
367 | if(p2 == NULL) { | |
368 | rv = sstrdup(path); | |
369 | break; | |
370 | } else { | |
371 | goto fail; | |
372 | } | |
373 | } | |
374 | if(*p == '.') | |
375 | goto fail; | |
376 | ||
377 | getconfig(path); | |
378 | ||
379 | /* | |
380 | * First, check the name verbatimely: | |
381 | */ | |
382 | buf = sprintf3("%s/%s", path, p); | |
383 | if(!stat(buf, &sb)) { | |
384 | if(S_ISDIR(sb.st_mode)) { | |
385 | ftmp = path; | |
386 | if(!strcmp(path, ".")) | |
387 | path = sstrdup(p); | |
388 | else | |
389 | path = sprintf2("%s/%s", path, p); | |
390 | free(ftmp); | |
391 | goto next; | |
392 | } | |
393 | if(S_ISREG(sb.st_mode)) { | |
394 | rv = sstrdup(buf); | |
395 | break; | |
396 | } | |
397 | goto fail; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Check the file extensionlessly: | |
402 | */ | |
403 | if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) { | |
404 | while((dent = readdir(dir)) != NULL) { | |
405 | buf = sprintf3("%s/%s", path, dent->d_name); | |
406 | if((p3 = strchr(dent->d_name, '.')) != NULL) | |
407 | *p3 = 0; | |
408 | if(strcmp(dent->d_name, p)) | |
409 | continue; | |
410 | if(stat(buf, &sb)) | |
411 | continue; | |
412 | if(!S_ISREG(sb.st_mode)) | |
413 | continue; | |
414 | rv = sstrdup(buf); | |
415 | break; | |
416 | } | |
417 | closedir(dir); | |
418 | if(dent != NULL) | |
419 | break; | |
420 | } | |
421 | ||
422 | goto fail; | |
423 | ||
424 | next: | |
425 | if(p2 == NULL) | |
426 | break; | |
427 | p = p2; | |
428 | } | |
429 | if(!strncmp(rv, "./", 2)) | |
430 | memmove(rv, rv + 2, strlen(rv + 2) + 1); | |
431 | goto out; | |
432 | ||
433 | fail: | |
434 | rv = NULL; | |
435 | out: | |
436 | free(path); | |
437 | return(rv); | |
438 | } | |
439 | ||
440 | static struct child *findchild(char *file, char *name) | |
441 | { | |
442 | char *buf, *p; | |
443 | struct config *cf; | |
444 | struct child *ch; | |
445 | ||
446 | buf = sstrdup(file); | |
447 | while(1) { | |
448 | ch = NULL; | |
449 | if(!strcmp(buf, ".")) | |
450 | break; | |
451 | if((p = strrchr(buf, '/')) != NULL) | |
452 | *p = 0; | |
453 | else | |
454 | strcpy(buf, "."); | |
455 | cf = getconfig(buf); | |
456 | if(cf == NULL) | |
457 | continue; | |
458 | if((ch = getchild(cf, name)) != NULL) | |
459 | break; | |
460 | } | |
461 | free(buf); | |
462 | return(ch); | |
463 | } | |
464 | ||
465 | static struct pattern *findmatch(char *file, int trydefault) | |
466 | { | |
467 | int i; | |
468 | char *buf, *p, *bn; | |
469 | struct config *cf; | |
470 | struct pattern *pat; | |
471 | struct rule *rule; | |
472 | ||
473 | if((bn = strrchr(file, '/')) != NULL) | |
474 | bn++; | |
475 | else | |
476 | bn = file; | |
477 | buf = sstrdup(file); | |
478 | while(1) { | |
479 | pat = NULL; | |
480 | if(!strcmp(buf, ".")) | |
481 | break; | |
482 | if((p = strrchr(buf, '/')) != NULL) | |
483 | *p = 0; | |
484 | else | |
485 | strcpy(buf, "."); | |
486 | cf = getconfig(buf); | |
487 | if(cf == NULL) | |
488 | continue; | |
489 | for(pat = cf->patterns; pat != NULL; pat = pat->next) { | |
490 | for(i = 0; (rule = pat->rules[i]) != NULL; i++) { | |
491 | if(rule->type == PAT_BASENAME) { | |
492 | if(fnmatch(rule->pattern, bn, 0)) | |
493 | break; | |
494 | } else if(rule->type == PAT_PATHNAME) { | |
495 | if(fnmatch(rule->pattern, file, FNM_PATHNAME)) | |
496 | break; | |
497 | } else if(rule->type == PAT_ALL) { | |
498 | } else if(rule->type == PAT_DEFAULT) { | |
499 | if(!trydefault) | |
500 | break; | |
501 | } | |
502 | } | |
503 | if(!rule) | |
504 | goto out; | |
505 | } | |
506 | } | |
507 | ||
508 | out: | |
509 | free(buf); | |
510 | return(pat); | |
511 | } | |
512 | ||
513 | static void forkchild(struct child *ch) | |
514 | { | |
515 | ch->fd = stdmkchild(ch->argv); | |
516 | } | |
517 | ||
518 | static void passreq(struct child *ch, struct hthead *req, int fd) | |
519 | { | |
520 | if(ch->fd < 0) | |
521 | forkchild(ch); | |
522 | if(sendreq(ch->fd, req, fd)) { | |
523 | if(errno == EPIPE) { | |
524 | /* Assume that the child has crashed and restart it. */ | |
525 | forkchild(ch); | |
526 | if(!sendreq(ch->fd, req, fd)) | |
527 | return; | |
528 | } | |
529 | flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno)); | |
530 | close(ch->fd); | |
531 | ch->fd = -1; | |
532 | } | |
533 | } | |
534 | ||
535 | static void serve(struct hthead *req, int fd) | |
536 | { | |
537 | char *file; | |
538 | struct stat sb; | |
539 | struct pattern *pat; | |
540 | struct child *ch; | |
541 | ||
542 | if((file = findfile(req, req->rest)) == NULL) { | |
543 | /* XXX: Do 404 handling */ | |
544 | return; | |
545 | } | |
546 | replrest(req, file); | |
547 | if(stat(file, &sb)) { | |
548 | flog(LOG_ERR, "could not stat previously found file %s: %s", file, strerror(errno)); | |
549 | free(file); | |
550 | return; | |
551 | } | |
552 | if(!S_ISREG(sb.st_mode)) { | |
553 | /* XXX: Handle default files or similar stuff. */ | |
554 | free(file); | |
555 | return; | |
556 | } | |
557 | if(((pat = findmatch(file, 0)) == NULL) && ((pat = findmatch(file, 1)) == NULL)) { | |
558 | /* XXX: Send a 500 error? 404? */ | |
559 | free(file); | |
560 | return; | |
561 | } | |
562 | if((ch = findchild(file, pat->childnm)) == NULL) { | |
563 | /* XXX: Send a 500 error. */ | |
564 | flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm); | |
565 | free(file); | |
566 | return; | |
567 | } | |
568 | ||
569 | if(ch->type == CH_SOCKET) { | |
570 | passreq(ch, req, fd); | |
571 | } else if(ch->type == CH_FORK) { | |
572 | stdforkserve(ch->argv, req, fd); | |
573 | } | |
574 | ||
575 | free(file); | |
576 | } | |
577 | ||
578 | int main(int argc, char **argv) | |
579 | { | |
580 | struct hthead *req; | |
581 | int fd; | |
582 | ||
583 | if(argc < 2) { | |
584 | flog(LOG_ERR, "usage: dirplex DIR"); | |
585 | exit(1); | |
586 | } | |
587 | if(chdir(argv[1])) { | |
588 | flog(LOG_ERR, "could not change directory to %s: %s", argv[1], strerror(errno)); | |
589 | exit(1); | |
590 | } | |
591 | signal(SIGCHLD, SIG_IGN); | |
592 | while(1) { | |
593 | if((fd = recvreq(0, &req)) < 0) { | |
594 | if(errno != 0) | |
595 | flog(LOG_ERR, "recvreq: %s", strerror(errno)); | |
596 | break; | |
597 | } | |
598 | serve(req, fd); | |
599 | freehthead(req); | |
600 | close(fd); | |
601 | } | |
602 | return(0); | |
603 | } |