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> |
06c1a718 | 38 | #include <cf.h> |
992ce9ef FT |
39 | |
40 | #define CH_SOCKET 0 | |
41 | #define CH_FORK 1 | |
42 | ||
43 | #define PAT_BASENAME 0 | |
44 | #define PAT_PATHNAME 1 | |
45 | #define PAT_ALL 2 | |
46 | #define PAT_DEFAULT 3 | |
47 | ||
48 | struct config { | |
49 | struct config *next, *prev; | |
50 | char *path; | |
51 | time_t mtime; | |
52 | struct child *children; | |
53 | struct pattern *patterns; | |
54 | }; | |
55 | ||
992ce9ef FT |
56 | struct rule { |
57 | int type; | |
58 | char *pattern; | |
59 | }; | |
60 | ||
61 | struct pattern { | |
62 | struct pattern *next; | |
63 | char *childnm; | |
64 | struct rule **rules; | |
65 | }; | |
66 | ||
67 | struct config *cflist; | |
68 | ||
992ce9ef FT |
69 | static void freepattern(struct pattern *pat) |
70 | { | |
71 | struct rule **rule; | |
72 | ||
73 | for(rule = pat->rules; *rule; rule++) { | |
74 | if((*rule)->pattern != NULL) | |
75 | free((*rule)->pattern); | |
76 | free(*rule); | |
77 | } | |
78 | if(pat->childnm != NULL) | |
79 | free(pat->childnm); | |
80 | free(pat); | |
81 | } | |
82 | ||
83 | static void freeconfig(struct config *cf) | |
84 | { | |
85 | struct child *ch, *nch; | |
86 | struct pattern *pat, *npat; | |
87 | ||
88 | if(cf->prev != NULL) | |
89 | cf->prev->next = cf->next; | |
90 | if(cf->next != NULL) | |
91 | cf->next->prev = cf->prev; | |
92 | if(cf == cflist) | |
93 | cflist = cf->next; | |
94 | free(cf->path); | |
95 | for(ch = cf->children; ch != NULL; ch = nch) { | |
96 | nch = ch->next; | |
97 | freechild(ch); | |
98 | } | |
99 | for(pat = cf->patterns; pat != NULL; pat = npat) { | |
100 | npat = pat->next; | |
101 | freepattern(pat); | |
102 | } | |
103 | free(cf); | |
104 | } | |
105 | ||
992ce9ef FT |
106 | static struct child *getchild(struct config *cf, char *name) |
107 | { | |
108 | struct child *ch; | |
109 | ||
110 | for(ch = cf->children; ch; ch = ch->next) { | |
111 | if(!strcmp(ch->name, name)) | |
112 | break; | |
113 | } | |
114 | return(ch); | |
115 | } | |
116 | ||
117 | static struct rule *newrule(struct pattern *pat) | |
118 | { | |
119 | int i; | |
120 | struct rule *rule; | |
121 | ||
122 | for(i = 0; pat->rules[i]; i++); | |
123 | pat->rules = srealloc(pat->rules, sizeof(*pat->rules) * (i + 2)); | |
cceb3611 | 124 | rule = pat->rules[i] = szmalloc(sizeof(*rule)); |
992ce9ef FT |
125 | pat->rules[i + 1] = NULL; |
126 | return(rule); | |
127 | } | |
128 | ||
129 | static struct pattern *newpattern(void) | |
130 | { | |
131 | struct pattern *pat; | |
132 | ||
133 | omalloc(pat); | |
134 | pat->rules = szmalloc(sizeof(*pat->rules)); | |
135 | return(pat); | |
136 | } | |
137 | ||
06c1a718 FT |
138 | static struct pattern *parsepattern(struct cfstate *s) |
139 | { | |
140 | struct pattern *pat; | |
141 | struct rule *rule; | |
142 | int sl; | |
143 | ||
144 | if(!strcmp(s->argv[0], "match")) { | |
145 | s->expstart = 1; | |
146 | pat = newpattern(); | |
147 | } else { | |
148 | return(NULL); | |
149 | } | |
150 | ||
151 | sl = s->lno; | |
152 | while(1) { | |
153 | getcfline(s); | |
154 | if(!strcmp(s->argv[0], "filename")) { | |
155 | if(s->argc < 2) { | |
156 | flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", s->file, s->lno); | |
157 | continue; | |
158 | } | |
159 | rule = newrule(pat); | |
160 | rule->type = PAT_BASENAME; | |
161 | rule->pattern = sstrdup(s->argv[1]); | |
162 | } else if(!strcmp(s->argv[0], "pathname")) { | |
163 | if(s->argc < 2) { | |
164 | flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", s->file, s->lno); | |
165 | continue; | |
166 | } | |
167 | rule = newrule(pat); | |
168 | rule->type = PAT_PATHNAME; | |
169 | rule->pattern = sstrdup(s->argv[1]); | |
170 | } else if(!strcmp(s->argv[0], "all")) { | |
171 | newrule(pat)->type = PAT_ALL; | |
172 | } else if(!strcmp(s->argv[0], "default")) { | |
173 | newrule(pat)->type = PAT_DEFAULT; | |
174 | } else if(!strcmp(s->argv[0], "handler")) { | |
175 | if(s->argc < 2) { | |
176 | flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno); | |
177 | continue; | |
178 | } | |
179 | if(pat->childnm != NULL) | |
180 | free(pat->childnm); | |
181 | pat->childnm = sstrdup(s->argv[1]); | |
182 | } else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) { | |
183 | break; | |
184 | } else { | |
185 | flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]); | |
186 | } | |
187 | } | |
188 | ||
189 | if(pat->rules[0] == NULL) { | |
190 | flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl); | |
191 | freepattern(pat); | |
192 | return(NULL); | |
193 | } | |
194 | if(pat->childnm == NULL) { | |
195 | flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl); | |
196 | freepattern(pat); | |
197 | return(NULL); | |
198 | } | |
199 | return(pat); | |
200 | } | |
201 | ||
992ce9ef FT |
202 | static struct config *readconfig(char *path) |
203 | { | |
06c1a718 FT |
204 | struct cfstate *s; |
205 | FILE *in; | |
992ce9ef | 206 | struct config *cf; |
992ce9ef FT |
207 | struct child *child; |
208 | struct pattern *pat; | |
992ce9ef | 209 | struct stat sb; |
06c1a718 | 210 | char *p; |
992ce9ef | 211 | |
cceb3611 FT |
212 | p = sprintf3("%s/.htrc", path); |
213 | if(stat(p, &sb)) | |
992ce9ef | 214 | return(NULL); |
06c1a718 FT |
215 | if((in = fopen(p, "r")) == NULL) { |
216 | flog(LOG_WARNING, "%s: %s", p, strerror(errno)); | |
992ce9ef | 217 | return(NULL); |
06c1a718 FT |
218 | } |
219 | s = mkcfparser(in, p); | |
992ce9ef FT |
220 | omalloc(cf); |
221 | cf->mtime = sb.st_mtime; | |
222 | cf->path = sstrdup(path); | |
06c1a718 FT |
223 | |
224 | while(1) { | |
225 | getcfline(s); | |
226 | if((child = parsechild(s)) != NULL) { | |
227 | child->next = cf->children; | |
228 | cf->children = child; | |
229 | } else if((pat = parsepattern(s)) != NULL) { | |
230 | pat->next = cf->patterns; | |
231 | cf->patterns = pat; | |
232 | } else if(!strcmp(s->argv[0], "eof")) { | |
233 | break; | |
234 | } else { | |
235 | flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]); | |
992ce9ef | 236 | } |
06c1a718 | 237 | } |
992ce9ef | 238 | |
06c1a718 FT |
239 | freecfparser(s); |
240 | fclose(in); | |
992ce9ef FT |
241 | return(cf); |
242 | } | |
243 | ||
244 | static struct config *getconfig(char *path) | |
245 | { | |
246 | struct config *cf; | |
247 | struct stat sb; | |
248 | ||
249 | for(cf = cflist; cf != NULL; cf = cf->next) { | |
250 | if(!strcmp(cf->path, path)) { | |
cceb3611 | 251 | if(stat(sprintf3("%s/.htrc", path), &sb)) |
992ce9ef FT |
252 | return(NULL); |
253 | if(sb.st_mtime != cf->mtime) { | |
254 | freeconfig(cf); | |
255 | break; | |
256 | } | |
257 | return(cf); | |
258 | } | |
259 | } | |
260 | if((cf = readconfig(path)) != NULL) { | |
261 | cf->next = cflist; | |
262 | cflist = cf; | |
263 | } | |
264 | return(cf); | |
265 | } | |
266 | ||
992ce9ef FT |
267 | static struct child *findchild(char *file, char *name) |
268 | { | |
269 | char *buf, *p; | |
270 | struct config *cf; | |
271 | struct child *ch; | |
272 | ||
273 | buf = sstrdup(file); | |
274 | while(1) { | |
275 | ch = NULL; | |
276 | if(!strcmp(buf, ".")) | |
277 | break; | |
278 | if((p = strrchr(buf, '/')) != NULL) | |
279 | *p = 0; | |
280 | else | |
281 | strcpy(buf, "."); | |
282 | cf = getconfig(buf); | |
283 | if(cf == NULL) | |
284 | continue; | |
285 | if((ch = getchild(cf, name)) != NULL) | |
286 | break; | |
287 | } | |
288 | free(buf); | |
289 | return(ch); | |
290 | } | |
291 | ||
292 | static struct pattern *findmatch(char *file, int trydefault) | |
293 | { | |
294 | int i; | |
295 | char *buf, *p, *bn; | |
296 | struct config *cf; | |
297 | struct pattern *pat; | |
298 | struct rule *rule; | |
299 | ||
300 | if((bn = strrchr(file, '/')) != NULL) | |
301 | bn++; | |
302 | else | |
303 | bn = file; | |
304 | buf = sstrdup(file); | |
305 | while(1) { | |
306 | pat = NULL; | |
307 | if(!strcmp(buf, ".")) | |
308 | break; | |
309 | if((p = strrchr(buf, '/')) != NULL) | |
310 | *p = 0; | |
311 | else | |
312 | strcpy(buf, "."); | |
313 | cf = getconfig(buf); | |
314 | if(cf == NULL) | |
315 | continue; | |
316 | for(pat = cf->patterns; pat != NULL; pat = pat->next) { | |
317 | for(i = 0; (rule = pat->rules[i]) != NULL; i++) { | |
318 | if(rule->type == PAT_BASENAME) { | |
319 | if(fnmatch(rule->pattern, bn, 0)) | |
320 | break; | |
321 | } else if(rule->type == PAT_PATHNAME) { | |
322 | if(fnmatch(rule->pattern, file, FNM_PATHNAME)) | |
323 | break; | |
324 | } else if(rule->type == PAT_ALL) { | |
325 | } else if(rule->type == PAT_DEFAULT) { | |
326 | if(!trydefault) | |
327 | break; | |
328 | } | |
329 | } | |
330 | if(!rule) | |
331 | goto out; | |
332 | } | |
333 | } | |
334 | ||
335 | out: | |
336 | free(buf); | |
337 | return(pat); | |
338 | } | |
339 | ||
340 | static void forkchild(struct child *ch) | |
341 | { | |
342 | ch->fd = stdmkchild(ch->argv); | |
343 | } | |
344 | ||
345 | static void passreq(struct child *ch, struct hthead *req, int fd) | |
346 | { | |
347 | if(ch->fd < 0) | |
348 | forkchild(ch); | |
349 | if(sendreq(ch->fd, req, fd)) { | |
350 | if(errno == EPIPE) { | |
351 | /* Assume that the child has crashed and restart it. */ | |
352 | forkchild(ch); | |
353 | if(!sendreq(ch->fd, req, fd)) | |
354 | return; | |
355 | } | |
356 | flog(LOG_ERR, "could not pass on request to child %s: %s", ch->name, strerror(errno)); | |
357 | close(ch->fd); | |
358 | ch->fd = -1; | |
da6187f5 | 359 | simpleerror(fd, 500, "Server Error", "The request handler crashed."); |
992ce9ef FT |
360 | } |
361 | } | |
362 | ||
54cefaba | 363 | static void handlefile(struct hthead *req, int fd, char *path) |
992ce9ef | 364 | { |
992ce9ef FT |
365 | struct pattern *pat; |
366 | struct child *ch; | |
54cefaba FT |
367 | |
368 | headappheader(req, "X-Ash-File", path); | |
369 | if(((pat = findmatch(path, 0)) == NULL) && ((pat = findmatch(path, 1)) == NULL)) { | |
992ce9ef | 370 | /* XXX: Send a 500 error? 404? */ |
992ce9ef FT |
371 | return; |
372 | } | |
54cefaba | 373 | if((ch = findchild(path, pat->childnm)) == NULL) { |
992ce9ef | 374 | flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm); |
d422fdfd | 375 | simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm); |
992ce9ef FT |
376 | return; |
377 | } | |
378 | ||
379 | if(ch->type == CH_SOCKET) { | |
380 | passreq(ch, req, fd); | |
381 | } else if(ch->type == CH_FORK) { | |
382 | stdforkserve(ch->argv, req, fd); | |
383 | } | |
54cefaba FT |
384 | } |
385 | ||
386 | static void handledir(struct hthead *req, int fd, char *path) | |
387 | { | |
d422fdfd | 388 | /* XXX: Todo */ |
06c1a718 | 389 | simpleerror(fd, 403, "Not Authorized", "Will not send directory listings or indices yet."); |
54cefaba FT |
390 | } |
391 | ||
392 | static int checkdir(struct hthead *req, int fd, char *path) | |
393 | { | |
394 | return(0); | |
395 | } | |
396 | ||
397 | static void serve(struct hthead *req, int fd) | |
398 | { | |
399 | char *p, *p2, *path, *tmp, *buf, *p3, *nm; | |
400 | struct stat sb; | |
401 | DIR *dir; | |
402 | struct dirent *dent; | |
992ce9ef | 403 | |
54cefaba FT |
404 | nm = req->rest; |
405 | path = sstrdup("."); | |
406 | p = nm; | |
407 | while(1) { | |
408 | if((p2 = strchr(p, '/')) == NULL) { | |
409 | } else { | |
410 | *(p2++) = 0; | |
411 | } | |
412 | ||
413 | if(!*p) { | |
414 | if(p2 == NULL) { | |
415 | if(stat(path, &sb)) { | |
416 | flog(LOG_WARNING, "failed to stat previously stated directory %s: %s", path, strerror(errno)); | |
d422fdfd | 417 | simpleerror(fd, 500, "Internal Server Error", "The server encountered an unexpected condition."); |
54cefaba FT |
418 | goto fail; |
419 | } | |
420 | break; | |
421 | } else { | |
d422fdfd | 422 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
423 | goto fail; |
424 | } | |
425 | } | |
d422fdfd FT |
426 | if(*p == '.') { |
427 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); | |
54cefaba | 428 | goto fail; |
d422fdfd | 429 | } |
54cefaba FT |
430 | |
431 | getconfig(path); | |
432 | ||
433 | /* | |
434 | * First, check the name verbatimely: | |
435 | */ | |
436 | buf = sprintf3("%s/%s", path, p); | |
437 | if(!stat(buf, &sb)) { | |
438 | if(S_ISDIR(sb.st_mode)) { | |
439 | tmp = path; | |
440 | if(!strcmp(path, ".")) | |
441 | path = sstrdup(p); | |
442 | else | |
443 | path = sprintf2("%s/%s", path, p); | |
444 | free(tmp); | |
445 | if(checkdir(req, fd, path)) | |
446 | break; | |
447 | goto next; | |
448 | } | |
449 | if(S_ISREG(sb.st_mode)) { | |
450 | tmp = path; | |
451 | path = sprintf2("%s/%s", path, p); | |
452 | free(tmp); | |
453 | break; | |
454 | } | |
d422fdfd | 455 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
456 | goto fail; |
457 | } | |
458 | ||
459 | /* | |
460 | * Check the file extensionlessly: | |
461 | */ | |
462 | if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) { | |
463 | while((dent = readdir(dir)) != NULL) { | |
464 | buf = sprintf3("%s/%s", path, dent->d_name); | |
465 | if((p3 = strchr(dent->d_name, '.')) != NULL) | |
466 | *p3 = 0; | |
467 | if(strcmp(dent->d_name, p)) | |
468 | continue; | |
469 | if(stat(buf, &sb)) | |
470 | continue; | |
471 | if(!S_ISREG(sb.st_mode)) | |
472 | continue; | |
473 | tmp = path; | |
474 | path = sstrdup(buf); | |
475 | free(tmp); | |
476 | break; | |
477 | } | |
478 | closedir(dir); | |
479 | if(dent != NULL) | |
480 | break; | |
481 | } | |
482 | ||
d422fdfd | 483 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
484 | goto fail; |
485 | ||
486 | next: | |
487 | if(p2 == NULL) | |
488 | break; | |
489 | p = p2; | |
490 | } | |
491 | if(p2 == NULL) | |
492 | replrest(req, ""); | |
493 | else | |
494 | replrest(req, p2); | |
495 | if(!strncmp(path, "./", 2)) | |
496 | memmove(path, path + 2, strlen(path + 2) + 1); | |
497 | if(S_ISDIR(sb.st_mode)) { | |
498 | handledir(req, fd, path); | |
499 | } else if(S_ISREG(sb.st_mode)) { | |
500 | handlefile(req, fd, path); | |
501 | } else { | |
d422fdfd | 502 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
54cefaba FT |
503 | goto fail; |
504 | } | |
505 | goto out; | |
506 | ||
507 | fail: | |
d422fdfd | 508 | /* No special handling, for now at least. */ |
54cefaba FT |
509 | out: |
510 | free(path); | |
992ce9ef FT |
511 | } |
512 | ||
513 | int main(int argc, char **argv) | |
514 | { | |
515 | struct hthead *req; | |
516 | int fd; | |
517 | ||
518 | if(argc < 2) { | |
519 | flog(LOG_ERR, "usage: dirplex DIR"); | |
520 | exit(1); | |
521 | } | |
522 | if(chdir(argv[1])) { | |
523 | flog(LOG_ERR, "could not change directory to %s: %s", argv[1], strerror(errno)); | |
524 | exit(1); | |
525 | } | |
526 | signal(SIGCHLD, SIG_IGN); | |
527 | while(1) { | |
528 | if((fd = recvreq(0, &req)) < 0) { | |
529 | if(errno != 0) | |
530 | flog(LOG_ERR, "recvreq: %s", strerror(errno)); | |
531 | break; | |
532 | } | |
533 | serve(req, fd); | |
534 | freehthead(req); | |
535 | close(fd); | |
536 | } | |
537 | return(0); | |
538 | } |