Commit | Line | Data |
---|---|---|
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> | |
d422fdfd | 37 | #include <resp.h> |
992ce9ef FT |
38 | |
39 | #define CH_SOCKET 0 | |
40 | #define CH_FORK 1 | |
41 | ||
42 | #define PAT_BASENAME 0 | |
43 | #define PAT_PATHNAME 1 | |
44 | #define PAT_ALL 2 | |
45 | #define PAT_DEFAULT 3 | |
46 | ||
47 | struct config { | |
48 | struct config *next, *prev; | |
49 | char *path; | |
50 | time_t mtime; | |
51 | struct child *children; | |
52 | struct pattern *patterns; | |
53 | }; | |
54 | ||
55 | struct child { | |
56 | struct child *next; | |
57 | char *name; | |
58 | int type; | |
59 | char **argv; | |
60 | int fd; | |
61 | }; | |
62 | ||
63 | struct rule { | |
64 | int type; | |
65 | char *pattern; | |
66 | }; | |
67 | ||
68 | struct pattern { | |
69 | struct pattern *next; | |
70 | char *childnm; | |
71 | struct rule **rules; | |
72 | }; | |
73 | ||
74 | struct config *cflist; | |
75 | ||
76 | static void freechild(struct child *ch) | |
77 | { | |
78 | if(ch->fd != -1) | |
79 | close(ch->fd); | |
80 | if(ch->name != NULL) | |
81 | free(ch->name); | |
82 | if(ch->argv != NULL) | |
83 | freeca(ch->argv); | |
84 | free(ch); | |
85 | } | |
86 | ||
87 | static void freepattern(struct pattern *pat) | |
88 | { | |
89 | struct rule **rule; | |
90 | ||
91 | for(rule = pat->rules; *rule; rule++) { | |
92 | if((*rule)->pattern != NULL) | |
93 | free((*rule)->pattern); | |
94 | free(*rule); | |
95 | } | |
96 | if(pat->childnm != NULL) | |
97 | free(pat->childnm); | |
98 | free(pat); | |
99 | } | |
100 | ||
101 | static void freeconfig(struct config *cf) | |
102 | { | |
103 | struct child *ch, *nch; | |
104 | struct pattern *pat, *npat; | |
105 | ||
106 | if(cf->prev != NULL) | |
107 | cf->prev->next = cf->next; | |
108 | if(cf->next != NULL) | |
109 | cf->next->prev = cf->prev; | |
110 | if(cf == cflist) | |
111 | cflist = cf->next; | |
112 | free(cf->path); | |
113 | for(ch = cf->children; ch != NULL; ch = nch) { | |
114 | nch = ch->next; | |
115 | freechild(ch); | |
116 | } | |
117 | for(pat = cf->patterns; pat != NULL; pat = npat) { | |
118 | npat = pat->next; | |
119 | freepattern(pat); | |
120 | } | |
121 | free(cf); | |
122 | } | |
123 | ||
124 | static struct child *newchild(char *name, int type) | |
125 | { | |
126 | struct child *ch; | |
127 | ||
128 | omalloc(ch); | |
129 | ch->name = sstrdup(name); | |
130 | ch->type = type; | |
131 | ch->fd = -1; | |
132 | return(ch); | |
133 | } | |
134 | ||
135 | static struct child *getchild(struct config *cf, char *name) | |
136 | { | |
137 | struct child *ch; | |
138 | ||
139 | for(ch = cf->children; ch; ch = ch->next) { | |
140 | if(!strcmp(ch->name, name)) | |
141 | break; | |
142 | } | |
143 | return(ch); | |
144 | } | |
145 | ||
146 | static struct rule *newrule(struct pattern *pat) | |
147 | { | |
148 | int i; | |
149 | struct rule *rule; | |
150 | ||
151 | for(i = 0; pat->rules[i]; i++); | |
152 | pat->rules = srealloc(pat->rules, sizeof(*pat->rules) * (i + 2)); | |
cceb3611 | 153 | rule = pat->rules[i] = szmalloc(sizeof(*rule)); |
992ce9ef FT |
154 | pat->rules[i + 1] = NULL; |
155 | return(rule); | |
156 | } | |
157 | ||
158 | static struct pattern *newpattern(void) | |
159 | { | |
160 | struct pattern *pat; | |
161 | ||
162 | omalloc(pat); | |
163 | pat->rules = szmalloc(sizeof(*pat->rules)); | |
164 | return(pat); | |
165 | } | |
166 | ||
167 | static struct config *readconfig(char *path) | |
168 | { | |
169 | int i; | |
170 | struct config *cf; | |
171 | FILE *s; | |
172 | char line[1024]; | |
173 | char *p, **w; | |
174 | int ind, eof; | |
175 | int lno; | |
176 | int state; | |
177 | int rv; | |
178 | int argc; | |
179 | struct child *child; | |
180 | struct pattern *pat; | |
181 | struct rule *rule; | |
182 | struct stat sb; | |
183 | ||
cceb3611 FT |
184 | p = sprintf3("%s/.htrc", path); |
185 | if(stat(p, &sb)) | |
992ce9ef | 186 | return(NULL); |
cceb3611 | 187 | if((s = fopen(p, "r")) == NULL) |
992ce9ef FT |
188 | return(NULL); |
189 | omalloc(cf); | |
190 | cf->mtime = sb.st_mtime; | |
191 | cf->path = sstrdup(path); | |
192 | eof = 0; | |
193 | state = 0; | |
194 | w = NULL; | |
195 | lno = 0; | |
196 | do { | |
197 | if(fgets(line, sizeof(line), s) == NULL) { | |
198 | eof = 1; | |
199 | line[0] = 0; | |
200 | } | |
201 | lno++; | |
202 | for(p = line; *p; p++) { | |
203 | if(*p == '#') | |
204 | continue; | |
205 | if(!isspace(*p)) | |
206 | break; | |
207 | } | |
208 | ind = isspace(line[0]); | |
209 | w = tokenize(line); | |
210 | argc = calen(w); | |
211 | ||
212 | retry: | |
213 | if(state == 0) { | |
214 | if(ind) { | |
215 | flog(LOG_WARNING, "%s%i: unexpected line indentation in global scope", path, lno); | |
216 | goto next; | |
217 | } else { | |
218 | if(!w[0]) { | |
219 | } else if(!strcmp(w[0], "child")) { | |
220 | if(argc < 2) { | |
221 | flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno); | |
222 | goto next; | |
223 | } | |
224 | child = newchild(w[1], CH_SOCKET); | |
225 | state = 1; | |
226 | } else if(!strcmp(w[0], "fchild")) { | |
227 | if(argc < 2) { | |
228 | flog(LOG_WARNING, "%s:%i: missing name in child declaration", path, lno); | |
229 | goto next; | |
230 | } | |
231 | child = newchild(w[1], CH_FORK); | |
232 | state = 1; | |
233 | } else if(!strcmp(w[0], "match")) { | |
234 | pat = newpattern(); | |
235 | state = 2; | |
236 | } else { | |
237 | flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]); | |
238 | } | |
239 | } | |
240 | } else if(state == 1) { | |
241 | if(ind) { | |
242 | if(!w[0]) { | |
243 | } else if(!strcmp(w[0], "exec")) { | |
244 | if(argc < 2) { | |
245 | flog(LOG_WARNING, "%s:%i: too few parameters to `exec'", path, lno); | |
246 | goto next; | |
247 | } | |
248 | child->argv = szmalloc(sizeof(*child->argv) * argc); | |
249 | for(i = 0; i < argc - 1; i++) | |
250 | child->argv[i] = sstrdup(w[i + 1]); | |
251 | } else { | |
252 | flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]); | |
253 | } | |
254 | } else { | |
255 | state = 0; | |
256 | if(child->argv == NULL) { | |
257 | flog(LOG_WARNING, "%s:%i: missing `exec' in child declaration %s", path, lno, child->name); | |
258 | freechild(child); | |
259 | goto retry; | |
260 | } | |
261 | child->next = cf->children; | |
262 | cf->children = child; | |
263 | goto retry; | |
264 | } | |
265 | } else if(state == 2) { | |
266 | if(ind) { | |
267 | if(!w[0]) { | |
268 | } else if(!strcmp(w[0], "filename")) { | |
269 | if(argc < 2) { | |
270 | flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", path, lno); | |
271 | goto next; | |
272 | } | |
273 | rule = newrule(pat); | |
274 | rule->type = PAT_BASENAME; | |
275 | rule->pattern = sstrdup(w[1]); | |
276 | } else if(!strcmp(w[0], "pathname")) { | |
277 | if(argc < 2) { | |
278 | flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", path, lno); | |
279 | goto next; | |
280 | } | |
281 | rule = newrule(pat); | |
282 | rule->type = PAT_PATHNAME; | |
283 | rule->pattern = sstrdup(w[1]); | |
284 | } else if(!strcmp(w[0], "all")) { | |
285 | newrule(pat)->type = PAT_ALL; | |
286 | } else if(!strcmp(w[0], "default")) { | |
287 | newrule(pat)->type = PAT_DEFAULT; | |
288 | } else if(!strcmp(w[0], "handler")) { | |
289 | if(argc < 2) { | |
290 | flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", path, lno); | |
291 | goto next; | |
292 | } | |
293 | if(pat->childnm != NULL) | |
294 | free(pat->childnm); | |
295 | pat->childnm = sstrdup(w[1]); | |
296 | } else { | |
297 | flog(LOG_WARNING, "%s:%i: unknown directive %s", path, lno, w[0]); | |
298 | } | |
299 | } else { | |
300 | state = 0; | |
301 | if(pat->rules[0] == NULL) { | |
302 | flog(LOG_WARNING, "%s:%i: missing rules in match declaration", path, lno); | |
303 | freepattern(pat); | |
304 | goto retry; | |
305 | } | |
306 | if(pat->childnm == NULL) { | |
307 | flog(LOG_WARNING, "%s:%i: missing handler in match declaration", path, lno); | |
308 | freepattern(pat); | |
309 | goto retry; | |
310 | } | |
311 | pat->next = cf->patterns; | |
312 | cf->patterns = pat; | |
313 | goto retry; | |
314 | } | |
315 | } | |
316 | ||
317 | next: | |
318 | freeca(w); | |
319 | w = NULL; | |
320 | } while(!eof); | |
321 | rv = 0; | |
322 | ||
323 | if(w != NULL) | |
324 | freeca(w); | |
325 | fclose(s); | |
326 | return(cf); | |
327 | } | |
328 | ||
329 | static struct config *getconfig(char *path) | |
330 | { | |
331 | struct config *cf; | |
332 | struct stat sb; | |
333 | ||
334 | for(cf = cflist; cf != NULL; cf = cf->next) { | |
335 | if(!strcmp(cf->path, path)) { | |
cceb3611 | 336 | if(stat(sprintf3("%s/.htrc", path), &sb)) |
992ce9ef FT |
337 | return(NULL); |
338 | if(sb.st_mtime != cf->mtime) { | |
339 | freeconfig(cf); | |
340 | break; | |
341 | } | |
342 | return(cf); | |
343 | } | |
344 | } | |
345 | if((cf = readconfig(path)) != NULL) { | |
346 | cf->next = cflist; | |
347 | cflist = cf; | |
348 | } | |
349 | return(cf); | |
350 | } | |
351 | ||
992ce9ef FT |
352 | static struct child *findchild(char *file, char *name) |
353 | { | |
354 | char *buf, *p; | |
355 | struct config *cf; | |
356 | struct child *ch; | |
357 | ||
358 | buf = sstrdup(file); | |
359 | while(1) { | |
360 | ch = NULL; | |
361 | if(!strcmp(buf, ".")) | |
362 | break; | |
363 | if((p = strrchr(buf, '/')) != NULL) | |
364 | *p = 0; | |
365 | else | |
366 | strcpy(buf, "."); | |
367 | cf = getconfig(buf); | |
368 | if(cf == NULL) | |
369 | continue; | |
370 | if((ch = getchild(cf, name)) != NULL) | |
371 | break; | |
372 | } | |
373 | free(buf); | |
374 | return(ch); | |
375 | } | |
376 | ||
377 | static struct pattern *findmatch(char *file, int trydefault) | |
378 | { | |
379 | int i; | |
380 | char *buf, *p, *bn; | |
381 | struct config *cf; | |
382 | struct pattern *pat; | |
383 | struct rule *rule; | |
384 | ||
385 | if((bn = strrchr(file, '/')) != NULL) | |
386 | bn++; | |
387 | else | |
388 | bn = file; | |
389 | buf = sstrdup(file); | |
390 | while(1) { | |
391 | pat = NULL; | |
392 | if(!strcmp(buf, ".")) | |
393 | break; | |
394 | if((p = strrchr(buf, '/')) != NULL) | |
395 | *p = 0; | |
396 | else | |
397 | strcpy(buf, "."); | |
398 | cf = getconfig(buf); | |
399 | if(cf == NULL) | |
400 | continue; | |
401 | for(pat = cf->patterns; pat != NULL; pat = pat->next) { | |
402 | for(i = 0; (rule = pat->rules[i]) != NULL; i++) { | |
403 | if(rule->type == PAT_BASENAME) { | |
404 | if(fnmatch(rule->pattern, bn, 0)) | |
405 | break; | |
406 | } else if(rule->type == PAT_PATHNAME) { | |
407 | if(fnmatch(rule->pattern, file, FNM_PATHNAME)) | |
408 | break; | |
409 | } else if(rule->type == PAT_ALL) { | |
410 | } else if(rule->type == PAT_DEFAULT) { | |
411 | if(!trydefault) | |
412 | break; | |
413 | } | |
414 | } | |
415 | if(!rule) | |
416 | goto out; | |
417 | } | |
418 | } | |
419 | ||
420 | out: | |
421 | free(buf); | |
422 | return(pat); | |
423 | } | |
424 | ||
425 | static void forkchild(struct child *ch) | |
426 | { | |
427 | ch->fd = stdmkchild(ch->argv); | |
428 | } | |
429 | ||
430 | static void passreq(struct child *ch, struct hthead *req, int fd) | |
431 | { | |
432 | if(ch->fd < 0) | |
433 | forkchild(ch); | |
434 | if(sendreq(ch->fd, req, fd)) { | |
435 | if(errno == EPIPE) { | |
436 | /* Assume that the child has crashed and restart it. */ | |
437 | forkchild(ch); | |
438 | if(!sendreq(ch->fd, req, fd)) | |
439 | return; | |
440 | } | |
441 | flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno)); | |
442 | close(ch->fd); | |
443 | ch->fd = -1; | |
da6187f5 | 444 | simpleerror(fd, 500, "Server Error", "The request handler crashed."); |
992ce9ef FT |
445 | } |
446 | } | |
447 | ||
54cefaba | 448 | static void handlefile(struct hthead *req, int fd, char *path) |
992ce9ef | 449 | { |
992ce9ef FT |
450 | struct pattern *pat; |
451 | struct child *ch; | |
54cefaba FT |
452 | |
453 | headappheader(req, "X-Ash-File", path); | |
454 | if(((pat = findmatch(path, 0)) == NULL) && ((pat = findmatch(path, 1)) == NULL)) { | |
992ce9ef | 455 | /* XXX: Send a 500 error? 404? */ |
992ce9ef FT |
456 | return; |
457 | } | |
54cefaba | 458 | if((ch = findchild(path, pat->childnm)) == NULL) { |
992ce9ef | 459 | flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm); |
d422fdfd | 460 | simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm); |
992ce9ef FT |
461 | return; |
462 | } | |
463 | ||
464 | if(ch->type == CH_SOCKET) { | |
465 | passreq(ch, req, fd); | |
466 | } else if(ch->type == CH_FORK) { | |
467 | stdforkserve(ch->argv, req, fd); | |
468 | } | |
54cefaba FT |
469 | } |
470 | ||
471 | static void handledir(struct hthead *req, int fd, char *path) | |
472 | { | |
d422fdfd FT |
473 | /* XXX: Todo */ |
474 | simpleerror(fd, 403, "Not Authorized", "Will not send directory listings or indices yet"); | |
54cefaba FT |
475 | } |
476 | ||
477 | static int checkdir(struct hthead *req, int fd, char *path) | |
478 | { | |
479 | return(0); | |
480 | } | |
481 | ||
482 | static void serve(struct hthead *req, int fd) | |
483 | { | |
484 | char *p, *p2, *path, *tmp, *buf, *p3, *nm; | |
485 | struct stat sb; | |
486 | DIR *dir; | |
487 | struct dirent *dent; | |
992ce9ef | 488 | |
54cefaba FT |
489 | nm = req->rest; |
490 | path = sstrdup("."); | |
491 | p = nm; | |
492 | while(1) { | |
493 | if((p2 = strchr(p, '/')) == NULL) { | |
494 | } else { | |
495 | *(p2++) = 0; | |
496 | } | |
497 | ||
498 | if(!*p) { | |
499 | if(p2 == NULL) { | |
500 | if(stat(path, &sb)) { | |
501 | flog(LOG_WARNING, "failed to stat previously stated directory %s: %s", path, strerror(errno)); | |
d422fdfd | 502 | simpleerror(fd, 500, "Internal Server Error", "The server encountered an unexpected condition."); |
54cefaba FT |
503 | goto fail; |
504 | } | |
505 | break; | |
506 | } else { | |
d422fdfd | 507 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
508 | goto fail; |
509 | } | |
510 | } | |
d422fdfd FT |
511 | if(*p == '.') { |
512 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); | |
54cefaba | 513 | goto fail; |
d422fdfd | 514 | } |
54cefaba FT |
515 | |
516 | getconfig(path); | |
517 | ||
518 | /* | |
519 | * First, check the name verbatimely: | |
520 | */ | |
521 | buf = sprintf3("%s/%s", path, p); | |
522 | if(!stat(buf, &sb)) { | |
523 | if(S_ISDIR(sb.st_mode)) { | |
524 | tmp = path; | |
525 | if(!strcmp(path, ".")) | |
526 | path = sstrdup(p); | |
527 | else | |
528 | path = sprintf2("%s/%s", path, p); | |
529 | free(tmp); | |
530 | if(checkdir(req, fd, path)) | |
531 | break; | |
532 | goto next; | |
533 | } | |
534 | if(S_ISREG(sb.st_mode)) { | |
535 | tmp = path; | |
536 | path = sprintf2("%s/%s", path, p); | |
537 | free(tmp); | |
538 | break; | |
539 | } | |
d422fdfd | 540 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
541 | goto fail; |
542 | } | |
543 | ||
544 | /* | |
545 | * Check the file extensionlessly: | |
546 | */ | |
547 | if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) { | |
548 | while((dent = readdir(dir)) != NULL) { | |
549 | buf = sprintf3("%s/%s", path, dent->d_name); | |
550 | if((p3 = strchr(dent->d_name, '.')) != NULL) | |
551 | *p3 = 0; | |
552 | if(strcmp(dent->d_name, p)) | |
553 | continue; | |
554 | if(stat(buf, &sb)) | |
555 | continue; | |
556 | if(!S_ISREG(sb.st_mode)) | |
557 | continue; | |
558 | tmp = path; | |
559 | path = sstrdup(buf); | |
560 | free(tmp); | |
561 | break; | |
562 | } | |
563 | closedir(dir); | |
564 | if(dent != NULL) | |
565 | break; | |
566 | } | |
567 | ||
d422fdfd | 568 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
569 | goto fail; |
570 | ||
571 | next: | |
572 | if(p2 == NULL) | |
573 | break; | |
574 | p = p2; | |
575 | } | |
576 | if(p2 == NULL) | |
577 | replrest(req, ""); | |
578 | else | |
579 | replrest(req, p2); | |
580 | if(!strncmp(path, "./", 2)) | |
581 | memmove(path, path + 2, strlen(path + 2) + 1); | |
582 | if(S_ISDIR(sb.st_mode)) { | |
583 | handledir(req, fd, path); | |
584 | } else if(S_ISREG(sb.st_mode)) { | |
585 | handlefile(req, fd, path); | |
586 | } else { | |
d422fdfd | 587 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
588 | goto fail; |
589 | } | |
590 | goto out; | |
591 | ||
592 | fail: | |
d422fdfd | 593 | /* No special handling, for now at least. */ |
54cefaba FT |
594 | out: |
595 | free(path); | |
992ce9ef FT |
596 | } |
597 | ||
598 | int main(int argc, char **argv) | |
599 | { | |
600 | struct hthead *req; | |
601 | int fd; | |
602 | ||
603 | if(argc < 2) { | |
604 | flog(LOG_ERR, "usage: dirplex DIR"); | |
605 | exit(1); | |
606 | } | |
607 | if(chdir(argv[1])) { | |
608 | flog(LOG_ERR, "could not change directory to %s: %s", argv[1], strerror(errno)); | |
609 | exit(1); | |
610 | } | |
611 | signal(SIGCHLD, SIG_IGN); | |
612 | while(1) { | |
613 | if((fd = recvreq(0, &req)) < 0) { | |
614 | if(errno != 0) | |
615 | flog(LOG_ERR, "recvreq: %s", strerror(errno)); | |
616 | break; | |
617 | } | |
618 | serve(req, fd); | |
619 | freehthead(req); | |
620 | close(fd); | |
621 | } | |
622 | return(0); | |
623 | } |