| 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 <unistd.h> |
| 22 | #include <string.h> |
| 23 | #include <errno.h> |
| 24 | #include <fnmatch.h> |
| 25 | #include <sys/stat.h> |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include <config.h> |
| 29 | #endif |
| 30 | #include <utils.h> |
| 31 | #include <log.h> |
| 32 | #include <cf.h> |
| 33 | #include <resp.h> |
| 34 | |
| 35 | #include "dirplex.h" |
| 36 | |
| 37 | static struct config *cflist; |
| 38 | struct config *gconfig, *lconfig; |
| 39 | |
| 40 | static void freerule(struct rule *rule) |
| 41 | { |
| 42 | freeca(rule->patterns); |
| 43 | free(rule); |
| 44 | } |
| 45 | |
| 46 | static void freepattern(struct pattern *pat) |
| 47 | { |
| 48 | struct rule **rule; |
| 49 | struct headmod *head; |
| 50 | |
| 51 | for(rule = pat->rules; *rule; rule++) |
| 52 | freerule(*rule); |
| 53 | while((head = pat->headers) != NULL) { |
| 54 | pat->headers = head->next; |
| 55 | free(head->name); |
| 56 | free(head->value); |
| 57 | free(head); |
| 58 | } |
| 59 | if(pat->childnm != NULL) |
| 60 | free(pat->childnm); |
| 61 | freeca(pat->fchild); |
| 62 | free(pat); |
| 63 | } |
| 64 | |
| 65 | static void freeconfig(struct config *cf) |
| 66 | { |
| 67 | struct child *ch, *nch; |
| 68 | struct pattern *pat, *npat; |
| 69 | |
| 70 | if(cf->prev != NULL) |
| 71 | cf->prev->next = cf->next; |
| 72 | if(cf->next != NULL) |
| 73 | cf->next->prev = cf->prev; |
| 74 | if(cf == cflist) |
| 75 | cflist = cf->next; |
| 76 | if(cf->path != NULL) |
| 77 | free(cf->path); |
| 78 | for(ch = cf->children; ch != NULL; ch = nch) { |
| 79 | nch = ch->next; |
| 80 | freechild(ch); |
| 81 | } |
| 82 | for(pat = cf->patterns; pat != NULL; pat = npat) { |
| 83 | npat = pat->next; |
| 84 | freepattern(pat); |
| 85 | } |
| 86 | freeca(cf->index); |
| 87 | if(cf->capture != NULL) |
| 88 | free(cf->capture); |
| 89 | if(cf->reparse != NULL) |
| 90 | free(cf->reparse); |
| 91 | free(cf); |
| 92 | } |
| 93 | |
| 94 | struct child *getchild(struct config *cf, char *name) |
| 95 | { |
| 96 | struct child *ch; |
| 97 | |
| 98 | for(ch = cf->children; ch; ch = ch->next) { |
| 99 | if(!strcmp(ch->name, name)) |
| 100 | break; |
| 101 | } |
| 102 | return(ch); |
| 103 | } |
| 104 | |
| 105 | static struct rule *newrule(struct pattern *pat) |
| 106 | { |
| 107 | int i; |
| 108 | struct rule *rule; |
| 109 | |
| 110 | for(i = 0; pat->rules[i]; i++); |
| 111 | pat->rules = srealloc(pat->rules, sizeof(*pat->rules) * (i + 2)); |
| 112 | rule = pat->rules[i] = szmalloc(sizeof(*rule)); |
| 113 | pat->rules[i + 1] = NULL; |
| 114 | return(rule); |
| 115 | } |
| 116 | |
| 117 | static struct pattern *newpattern(void) |
| 118 | { |
| 119 | struct pattern *pat; |
| 120 | |
| 121 | omalloc(pat); |
| 122 | pat->rules = szmalloc(sizeof(*pat->rules)); |
| 123 | return(pat); |
| 124 | } |
| 125 | |
| 126 | static char **cadup(char **w) |
| 127 | { |
| 128 | char **ret; |
| 129 | int i, l; |
| 130 | |
| 131 | l = calen(w); |
| 132 | ret = smalloc(sizeof(*ret) * (l + 1)); |
| 133 | for(i = 0; i < l; i++) |
| 134 | ret[i] = sstrdup(w[i]); |
| 135 | ret[i] = NULL; |
| 136 | return(ret); |
| 137 | } |
| 138 | |
| 139 | static struct pattern *parsepattern(struct cfstate *s) |
| 140 | { |
| 141 | struct pattern *pat; |
| 142 | struct rule *rule; |
| 143 | struct headmod *head; |
| 144 | int sl; |
| 145 | |
| 146 | if(!strcmp(s->argv[0], "match")) { |
| 147 | s->expstart = 1; |
| 148 | pat = newpattern(); |
| 149 | } else { |
| 150 | return(NULL); |
| 151 | } |
| 152 | |
| 153 | if((s->argc > 1) && !strcmp(s->argv[1], "directory")) |
| 154 | pat->type = PT_DIR; |
| 155 | else if((s->argc > 1) && !strcmp(s->argv[1], "notfound")) |
| 156 | pat->type = PT_NOTFOUND; |
| 157 | else |
| 158 | pat->type = PT_FILE; |
| 159 | sl = s->lno; |
| 160 | while(1) { |
| 161 | getcfline(s); |
| 162 | if(!strcmp(s->argv[0], "filename")) { |
| 163 | if(s->argc < 2) { |
| 164 | flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", s->file, s->lno); |
| 165 | continue; |
| 166 | } |
| 167 | rule = newrule(pat); |
| 168 | rule->type = PAT_BASENAME; |
| 169 | rule->patterns = cadup(s->argv + 1); |
| 170 | } else if(!strcmp(s->argv[0], "pathname")) { |
| 171 | if(s->argc < 2) { |
| 172 | flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", s->file, s->lno); |
| 173 | continue; |
| 174 | } |
| 175 | rule = newrule(pat); |
| 176 | rule->type = PAT_PATHNAME; |
| 177 | rule->patterns = cadup(s->argv + 1); |
| 178 | } else if(!strcmp(s->argv[0], "all")) { |
| 179 | newrule(pat)->type = PAT_ALL; |
| 180 | } else if(!strcmp(s->argv[0], "default")) { |
| 181 | newrule(pat)->type = PAT_DEFAULT; |
| 182 | } else if(!strcmp(s->argv[0], "local")) { |
| 183 | newrule(pat)->type = PAT_LOCAL; |
| 184 | } else if(!strcmp(s->argv[0], "handler")) { |
| 185 | if(s->argc < 2) { |
| 186 | flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno); |
| 187 | continue; |
| 188 | } |
| 189 | if(pat->childnm != NULL) |
| 190 | free(pat->childnm); |
| 191 | pat->childnm = sstrdup(s->argv[1]); |
| 192 | } else if(!strcmp(s->argv[0], "fork")) { |
| 193 | pat->fchild = cadup(s->argv + 1); |
| 194 | } else if(!strcmp(s->argv[0], "set") || !strcmp(s->argv[0], "xset")) { |
| 195 | if(s->argc < 3) { |
| 196 | flog(LOG_WARNING, "%s:%i: missing header name or pattern for `%s' directive", s->file, s->lno, s->argv[0]); |
| 197 | continue; |
| 198 | } |
| 199 | omalloc(head); |
| 200 | if(!strcmp(s->argv[0], "xset")) |
| 201 | head->name = sprintf2("X-Ash-%s", s->argv[1]); |
| 202 | else |
| 203 | head->name = sstrdup(s->argv[1]); |
| 204 | head->value = sstrdup(s->argv[2]); |
| 205 | head->next = pat->headers; |
| 206 | pat->headers = head; |
| 207 | } else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) { |
| 208 | break; |
| 209 | } else { |
| 210 | flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]); |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | if(pat->rules[0] == NULL) { |
| 215 | flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl); |
| 216 | freepattern(pat); |
| 217 | return(NULL); |
| 218 | } |
| 219 | if((pat->childnm == NULL) && (pat->fchild == NULL)) { |
| 220 | flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl); |
| 221 | freepattern(pat); |
| 222 | return(NULL); |
| 223 | } |
| 224 | return(pat); |
| 225 | } |
| 226 | |
| 227 | static struct config *emptyconfig(void) |
| 228 | { |
| 229 | struct config *cf; |
| 230 | |
| 231 | omalloc(cf); |
| 232 | return(cf); |
| 233 | } |
| 234 | |
| 235 | struct config *readconfig(char *file) |
| 236 | { |
| 237 | struct cfstate *s; |
| 238 | FILE *in; |
| 239 | struct config *cf; |
| 240 | struct child *child; |
| 241 | struct pattern *pat; |
| 242 | |
| 243 | if((in = fopen(file, "r")) == NULL) { |
| 244 | flog(LOG_WARNING, "%s: %s", file, strerror(errno)); |
| 245 | return(NULL); |
| 246 | } |
| 247 | s = mkcfparser(in, file); |
| 248 | cf = emptyconfig(); |
| 249 | |
| 250 | while(1) { |
| 251 | getcfline(s); |
| 252 | if((child = parsechild(s)) != NULL) { |
| 253 | child->next = cf->children; |
| 254 | cf->children = child; |
| 255 | } else if((pat = parsepattern(s)) != NULL) { |
| 256 | pat->next = cf->patterns; |
| 257 | cf->patterns = pat; |
| 258 | } else if(!strcmp(s->argv[0], "index-file")) { |
| 259 | freeca(cf->index); |
| 260 | cf->index = cadup(s->argv + 1); |
| 261 | } else if(!strcmp(s->argv[0], "capture")) { |
| 262 | if(s->argc < 2) { |
| 263 | flog(LOG_WARNING, "%s:%i: missing argument to capture declaration", s->file, s->lno); |
| 264 | continue; |
| 265 | } |
| 266 | if(cf->capture != NULL) |
| 267 | free(cf->capture); |
| 268 | cf->capture = sstrdup(s->argv[1]); |
| 269 | cf->caproot = 0; |
| 270 | if((s->argc > 2) && strchr(s->argv[2], 'D')) |
| 271 | cf->caproot = 1; |
| 272 | } else if(!strcmp(s->argv[0], "reparse")) { |
| 273 | if(s->argc < 2) { |
| 274 | flog(LOG_WARNING, "%s:%i: missing argument to reparse declaration", s->file, s->lno); |
| 275 | continue; |
| 276 | } |
| 277 | if(cf->reparse != NULL) |
| 278 | free(cf->reparse); |
| 279 | cf->reparse = sstrdup(s->argv[1]); |
| 280 | cf->parsecomb = 0; |
| 281 | if((s->argc > 2) && strchr(s->argv[2], 'c')) |
| 282 | cf->parsecomb = 1; |
| 283 | } else if(!strcmp(s->argv[0], "eof")) { |
| 284 | break; |
| 285 | } else { |
| 286 | flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]); |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | freecfparser(s); |
| 291 | fclose(in); |
| 292 | return(cf); |
| 293 | } |
| 294 | |
| 295 | struct config *getconfig(char *path) |
| 296 | { |
| 297 | struct config *cf, *ocf; |
| 298 | struct stat sb; |
| 299 | char *fn; |
| 300 | time_t mtime; |
| 301 | |
| 302 | fn = sprintf3("%s/.htrc", path); |
| 303 | for(cf = cflist; cf != NULL; cf = cf->next) { |
| 304 | if(!strcmp(cf->path, path)) { |
| 305 | if(now - cf->lastck > 5) { |
| 306 | cf->lastck = now; |
| 307 | if(stat(fn, &sb) || (sb.st_mtime != cf->mtime)) |
| 308 | break; |
| 309 | } |
| 310 | return(cf); |
| 311 | } |
| 312 | } |
| 313 | ocf = cf; |
| 314 | if(access(fn, R_OK) || stat(fn, &sb)) { |
| 315 | cf = emptyconfig(); |
| 316 | mtime = 0; |
| 317 | } else { |
| 318 | if((cf = readconfig(fn)) == NULL) |
| 319 | return(NULL); |
| 320 | mtime = sb.st_mtime; |
| 321 | } |
| 322 | if(ocf != NULL) { |
| 323 | mergechildren(cf->children, ocf->children); |
| 324 | freeconfig(ocf); |
| 325 | } |
| 326 | cf->path = sstrdup(path); |
| 327 | cf->mtime = mtime; |
| 328 | cf->lastck = now; |
| 329 | cf->next = cflist; |
| 330 | cf->prev = NULL; |
| 331 | if(cflist != NULL) |
| 332 | cflist->prev = cf; |
| 333 | cflist = cf; |
| 334 | return(cf); |
| 335 | } |
| 336 | |
| 337 | struct config **getconfigs(char *file) |
| 338 | { |
| 339 | static struct config **ret = NULL; |
| 340 | struct { |
| 341 | struct config **b; |
| 342 | size_t s, d; |
| 343 | } buf; |
| 344 | struct config *cf; |
| 345 | char *tmp, *p; |
| 346 | |
| 347 | if(ret != NULL) |
| 348 | free(ret); |
| 349 | bufinit(buf); |
| 350 | if(!strncmp(file, "./", 2)) |
| 351 | file += 2; |
| 352 | tmp = sstrdup(file); |
| 353 | while(1) { |
| 354 | if((p = strrchr(tmp, '/')) == NULL) |
| 355 | break; |
| 356 | *p = 0; |
| 357 | if((cf = getconfig(tmp)) != NULL) |
| 358 | bufadd(buf, cf); |
| 359 | } |
| 360 | free(tmp); |
| 361 | if((cf = getconfig(".")) != NULL) |
| 362 | bufadd(buf, cf); |
| 363 | if(lconfig != NULL) |
| 364 | bufadd(buf, lconfig); |
| 365 | if(gconfig != NULL) |
| 366 | bufadd(buf, gconfig); |
| 367 | bufadd(buf, NULL); |
| 368 | return(ret = buf.b); |
| 369 | } |
| 370 | |
| 371 | struct child *findchild(char *file, char *name, struct config **cf) |
| 372 | { |
| 373 | int i; |
| 374 | struct config **cfs; |
| 375 | struct child *ch; |
| 376 | |
| 377 | if(cf != NULL) |
| 378 | *cf = NULL; |
| 379 | cfs = getconfigs(file); |
| 380 | for(i = 0; cfs[i] != NULL; i++) { |
| 381 | if((ch = getchild(cfs[i], name)) != NULL) { |
| 382 | if(cf != NULL) |
| 383 | *cf = cfs[i]; |
| 384 | return(ch); |
| 385 | } |
| 386 | } |
| 387 | if(!strcmp(name, ".notfound")) |
| 388 | return(notfound); |
| 389 | return(NULL); |
| 390 | } |
| 391 | |
| 392 | struct pattern *findmatch(char *file, int trydefault, int type) |
| 393 | { |
| 394 | int i, o, c; |
| 395 | char *bn, *ln; |
| 396 | struct config **cfs; |
| 397 | struct pattern *pat; |
| 398 | struct rule *rule; |
| 399 | size_t pl; |
| 400 | |
| 401 | if((bn = strrchr(file, '/')) != NULL) |
| 402 | bn++; |
| 403 | else |
| 404 | bn = file; |
| 405 | cfs = getconfigs(file); |
| 406 | for(c = 0; cfs[c] != NULL; c++) { |
| 407 | if(cfs[c]->path == NULL) { |
| 408 | ln = file; |
| 409 | } else { |
| 410 | pl = strlen(cfs[c]->path); |
| 411 | if((strlen(file) > pl) && !strncmp(file, cfs[c]->path, pl) && (file[pl] == '/')) |
| 412 | ln = file + pl + 1; |
| 413 | else |
| 414 | ln = file; /* This should only happen in the base directory. */ |
| 415 | } |
| 416 | for(pat = cfs[c]->patterns; pat != NULL; pat = pat->next) { |
| 417 | if(pat->type != type) |
| 418 | continue; |
| 419 | for(i = 0; (rule = pat->rules[i]) != NULL; i++) { |
| 420 | if(rule->type == PAT_BASENAME) { |
| 421 | for(o = 0; rule->patterns[o] != NULL; o++) { |
| 422 | if(!fnmatch(rule->patterns[o], bn, 0)) |
| 423 | break; |
| 424 | } |
| 425 | if(rule->patterns[o] == NULL) |
| 426 | break; |
| 427 | } else if(rule->type == PAT_PATHNAME) { |
| 428 | for(o = 0; rule->patterns[o] != NULL; o++) { |
| 429 | if(!fnmatch(rule->patterns[o], ln, FNM_PATHNAME)) |
| 430 | break; |
| 431 | } |
| 432 | if(rule->patterns[o] == NULL) |
| 433 | break; |
| 434 | } else if(rule->type == PAT_ALL) { |
| 435 | } else if(rule->type == PAT_DEFAULT) { |
| 436 | if(!trydefault) |
| 437 | break; |
| 438 | } else if(rule->type == PAT_LOCAL) { |
| 439 | if(strchr(ln, '/')) |
| 440 | break; |
| 441 | } |
| 442 | } |
| 443 | if(!rule) |
| 444 | return(pat); |
| 445 | } |
| 446 | } |
| 447 | if(!trydefault) |
| 448 | return(findmatch(file, 1, type)); |
| 449 | return(NULL); |
| 450 | } |
| 451 | |
| 452 | static int donotfound(struct child *ch, struct hthead *req, int fd, void (*chinit)(void *), void *idata) |
| 453 | { |
| 454 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 455 | return(0); |
| 456 | } |
| 457 | |
| 458 | static struct chandler i_notfound = { |
| 459 | .handle = donotfound, |
| 460 | }; |
| 461 | |
| 462 | static struct child s_notfound = { |
| 463 | .name = ".notfound", |
| 464 | .iface = &i_notfound, |
| 465 | }; |
| 466 | struct child *notfound = &s_notfound; |