| 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 | #include <time.h> |
| 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | #include <config.h> |
| 32 | #endif |
| 33 | #include <utils.h> |
| 34 | #include <mt.h> |
| 35 | #include <log.h> |
| 36 | #include <req.h> |
| 37 | #include <proc.h> |
| 38 | #include <resp.h> |
| 39 | #include <cf.h> |
| 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, lastck; |
| 50 | struct child *children; |
| 51 | struct pattern *patterns; |
| 52 | }; |
| 53 | |
| 54 | struct rule { |
| 55 | int type; |
| 56 | char **patterns; |
| 57 | }; |
| 58 | |
| 59 | struct pattern { |
| 60 | struct pattern *next; |
| 61 | char *childnm; |
| 62 | char **fchild; |
| 63 | struct rule **rules; |
| 64 | }; |
| 65 | |
| 66 | static struct config *cflist; |
| 67 | static struct config *gconfig, *lconfig; |
| 68 | static time_t now; |
| 69 | |
| 70 | static void freerule(struct rule *rule) |
| 71 | { |
| 72 | freeca(rule->patterns); |
| 73 | free(rule); |
| 74 | } |
| 75 | |
| 76 | static void freepattern(struct pattern *pat) |
| 77 | { |
| 78 | struct rule **rule; |
| 79 | |
| 80 | for(rule = pat->rules; *rule; rule++) |
| 81 | freerule(*rule); |
| 82 | if(pat->childnm != NULL) |
| 83 | free(pat->childnm); |
| 84 | freeca(pat->fchild); |
| 85 | free(pat); |
| 86 | } |
| 87 | |
| 88 | static void freeconfig(struct config *cf) |
| 89 | { |
| 90 | struct child *ch, *nch; |
| 91 | struct pattern *pat, *npat; |
| 92 | |
| 93 | if(cf->prev != NULL) |
| 94 | cf->prev->next = cf->next; |
| 95 | if(cf->next != NULL) |
| 96 | cf->next->prev = cf->prev; |
| 97 | if(cf == cflist) |
| 98 | cflist = cf->next; |
| 99 | if(cf->path != NULL) |
| 100 | free(cf->path); |
| 101 | for(ch = cf->children; ch != NULL; ch = nch) { |
| 102 | nch = ch->next; |
| 103 | freechild(ch); |
| 104 | } |
| 105 | for(pat = cf->patterns; pat != NULL; pat = npat) { |
| 106 | npat = pat->next; |
| 107 | freepattern(pat); |
| 108 | } |
| 109 | free(cf); |
| 110 | } |
| 111 | |
| 112 | static struct child *getchild(struct config *cf, char *name) |
| 113 | { |
| 114 | struct child *ch; |
| 115 | |
| 116 | for(ch = cf->children; ch; ch = ch->next) { |
| 117 | if(!strcmp(ch->name, name)) |
| 118 | break; |
| 119 | } |
| 120 | return(ch); |
| 121 | } |
| 122 | |
| 123 | static struct rule *newrule(struct pattern *pat) |
| 124 | { |
| 125 | int i; |
| 126 | struct rule *rule; |
| 127 | |
| 128 | for(i = 0; pat->rules[i]; i++); |
| 129 | pat->rules = srealloc(pat->rules, sizeof(*pat->rules) * (i + 2)); |
| 130 | rule = pat->rules[i] = szmalloc(sizeof(*rule)); |
| 131 | pat->rules[i + 1] = NULL; |
| 132 | return(rule); |
| 133 | } |
| 134 | |
| 135 | static struct pattern *newpattern(void) |
| 136 | { |
| 137 | struct pattern *pat; |
| 138 | |
| 139 | omalloc(pat); |
| 140 | pat->rules = szmalloc(sizeof(*pat->rules)); |
| 141 | return(pat); |
| 142 | } |
| 143 | |
| 144 | static char **cadup(char **w) |
| 145 | { |
| 146 | char **ret; |
| 147 | int i, l; |
| 148 | |
| 149 | l = calen(w); |
| 150 | ret = smalloc(sizeof(*ret) * (l + 1)); |
| 151 | for(i = 0; i < l; i++) |
| 152 | ret[i] = sstrdup(w[i]); |
| 153 | ret[i] = NULL; |
| 154 | return(ret); |
| 155 | } |
| 156 | |
| 157 | static struct pattern *parsepattern(struct cfstate *s) |
| 158 | { |
| 159 | struct pattern *pat; |
| 160 | struct rule *rule; |
| 161 | int sl; |
| 162 | |
| 163 | if(!strcmp(s->argv[0], "match")) { |
| 164 | s->expstart = 1; |
| 165 | pat = newpattern(); |
| 166 | } else { |
| 167 | return(NULL); |
| 168 | } |
| 169 | |
| 170 | sl = s->lno; |
| 171 | while(1) { |
| 172 | getcfline(s); |
| 173 | if(!strcmp(s->argv[0], "filename")) { |
| 174 | if(s->argc < 2) { |
| 175 | flog(LOG_WARNING, "%s:%i: missing pattern for `filename' match", s->file, s->lno); |
| 176 | continue; |
| 177 | } |
| 178 | rule = newrule(pat); |
| 179 | rule->type = PAT_BASENAME; |
| 180 | rule->patterns = cadup(s->argv + 1); |
| 181 | } else if(!strcmp(s->argv[0], "pathname")) { |
| 182 | if(s->argc < 2) { |
| 183 | flog(LOG_WARNING, "%s:%i: missing pattern for `pathname' match", s->file, s->lno); |
| 184 | continue; |
| 185 | } |
| 186 | rule = newrule(pat); |
| 187 | rule->type = PAT_PATHNAME; |
| 188 | rule->patterns = cadup(s->argv + 1); |
| 189 | } else if(!strcmp(s->argv[0], "all")) { |
| 190 | newrule(pat)->type = PAT_ALL; |
| 191 | } else if(!strcmp(s->argv[0], "default")) { |
| 192 | newrule(pat)->type = PAT_DEFAULT; |
| 193 | } else if(!strcmp(s->argv[0], "handler")) { |
| 194 | if(s->argc < 2) { |
| 195 | flog(LOG_WARNING, "%s:%i: missing child name for `handler' directive", s->file, s->lno); |
| 196 | continue; |
| 197 | } |
| 198 | if(pat->childnm != NULL) |
| 199 | free(pat->childnm); |
| 200 | pat->childnm = sstrdup(s->argv[1]); |
| 201 | } else if(!strcmp(s->argv[0], "fork")) { |
| 202 | pat->fchild = cadup(s->argv + 1); |
| 203 | } else if(!strcmp(s->argv[0], "end") || !strcmp(s->argv[0], "eof")) { |
| 204 | break; |
| 205 | } else { |
| 206 | flog(LOG_WARNING, "%s:%i: unknown directive `%s' in pattern declaration", s->file, s->lno, s->argv[0]); |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | if(pat->rules[0] == NULL) { |
| 211 | flog(LOG_WARNING, "%s:%i: missing rules in match declaration", s->file, sl); |
| 212 | freepattern(pat); |
| 213 | return(NULL); |
| 214 | } |
| 215 | if((pat->childnm == NULL) && (pat->fchild == NULL)) { |
| 216 | flog(LOG_WARNING, "%s:%i: missing handler in match declaration", s->file, sl); |
| 217 | freepattern(pat); |
| 218 | return(NULL); |
| 219 | } |
| 220 | return(pat); |
| 221 | } |
| 222 | |
| 223 | static struct config *emptyconfig(void) |
| 224 | { |
| 225 | struct config *cf; |
| 226 | |
| 227 | omalloc(cf); |
| 228 | return(cf); |
| 229 | } |
| 230 | |
| 231 | static struct config *readconfig(char *file) |
| 232 | { |
| 233 | struct cfstate *s; |
| 234 | FILE *in; |
| 235 | struct config *cf; |
| 236 | struct child *child; |
| 237 | struct pattern *pat; |
| 238 | |
| 239 | if((in = fopen(file, "r")) == NULL) { |
| 240 | flog(LOG_WARNING, "%s: %s", file, strerror(errno)); |
| 241 | return(NULL); |
| 242 | } |
| 243 | s = mkcfparser(in, file); |
| 244 | cf = emptyconfig(); |
| 245 | |
| 246 | while(1) { |
| 247 | getcfline(s); |
| 248 | if((child = parsechild(s)) != NULL) { |
| 249 | child->next = cf->children; |
| 250 | cf->children = child; |
| 251 | } else if((pat = parsepattern(s)) != NULL) { |
| 252 | pat->next = cf->patterns; |
| 253 | cf->patterns = pat; |
| 254 | } else if(!strcmp(s->argv[0], "eof")) { |
| 255 | break; |
| 256 | } else { |
| 257 | flog(LOG_WARNING, "%s:%i: unknown directive `%s'", s->file, s->lno, s->argv[0]); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | freecfparser(s); |
| 262 | fclose(in); |
| 263 | return(cf); |
| 264 | } |
| 265 | |
| 266 | static struct config *getconfig(char *path) |
| 267 | { |
| 268 | struct config *cf; |
| 269 | struct stat sb; |
| 270 | char *fn; |
| 271 | time_t mtime; |
| 272 | |
| 273 | fn = sprintf3("%s/.htrc", path); |
| 274 | for(cf = cflist; cf != NULL; cf = cf->next) { |
| 275 | if(!strcmp(cf->path, path)) { |
| 276 | if(now - cf->lastck > 5) { |
| 277 | if(stat(fn, &sb) || (sb.st_mtime != cf->mtime)) { |
| 278 | freeconfig(cf); |
| 279 | break; |
| 280 | } |
| 281 | } |
| 282 | cf->lastck = now; |
| 283 | return(cf); |
| 284 | } |
| 285 | } |
| 286 | if(access(fn, R_OK) || stat(fn, &sb)) { |
| 287 | cf = emptyconfig(); |
| 288 | mtime = 0; |
| 289 | } else { |
| 290 | if((cf = readconfig(fn)) == NULL) |
| 291 | return(NULL); |
| 292 | mtime = sb.st_mtime; |
| 293 | } |
| 294 | cf->path = sstrdup(path); |
| 295 | cf->mtime = mtime; |
| 296 | cf->lastck = now; |
| 297 | cf->next = cflist; |
| 298 | cflist = cf; |
| 299 | return(cf); |
| 300 | } |
| 301 | |
| 302 | static struct config **getconfigs(char *file) |
| 303 | { |
| 304 | static struct config **ret = NULL; |
| 305 | struct { |
| 306 | struct config **b; |
| 307 | size_t s, d; |
| 308 | } buf; |
| 309 | struct config *cf; |
| 310 | char *tmp, *p; |
| 311 | |
| 312 | if(ret != NULL) |
| 313 | free(ret); |
| 314 | bufinit(buf); |
| 315 | tmp = sstrdup(file); |
| 316 | while(1) { |
| 317 | if((p = strrchr(tmp, '/')) == NULL) |
| 318 | break; |
| 319 | *p = 0; |
| 320 | if((cf = getconfig(tmp)) != NULL) |
| 321 | bufadd(buf, cf); |
| 322 | } |
| 323 | free(tmp); |
| 324 | if((cf = getconfig(".")) != NULL) |
| 325 | bufadd(buf, cf); |
| 326 | if(lconfig != NULL) |
| 327 | bufadd(buf, lconfig); |
| 328 | if(gconfig != NULL) |
| 329 | bufadd(buf, gconfig); |
| 330 | bufadd(buf, NULL); |
| 331 | return(ret = buf.b); |
| 332 | } |
| 333 | |
| 334 | static struct child *findchild(char *file, char *name) |
| 335 | { |
| 336 | int i; |
| 337 | struct config **cfs; |
| 338 | struct child *ch; |
| 339 | |
| 340 | cfs = getconfigs(file); |
| 341 | for(i = 0; cfs[i] != NULL; i++) { |
| 342 | if((ch = getchild(cfs[i], name)) != NULL) |
| 343 | break; |
| 344 | } |
| 345 | return(ch); |
| 346 | } |
| 347 | |
| 348 | static struct pattern *findmatch(char *file, int trydefault) |
| 349 | { |
| 350 | int i, o, c; |
| 351 | char *bn; |
| 352 | struct config **cfs; |
| 353 | struct pattern *pat; |
| 354 | struct rule *rule; |
| 355 | |
| 356 | if((bn = strrchr(file, '/')) != NULL) |
| 357 | bn++; |
| 358 | else |
| 359 | bn = file; |
| 360 | cfs = getconfigs(file); |
| 361 | for(c = 0; cfs[c] != NULL; c++) { |
| 362 | for(pat = cfs[c]->patterns; pat != NULL; pat = pat->next) { |
| 363 | for(i = 0; (rule = pat->rules[i]) != NULL; i++) { |
| 364 | if(rule->type == PAT_BASENAME) { |
| 365 | for(o = 0; rule->patterns[o] != NULL; o++) { |
| 366 | if(!fnmatch(rule->patterns[o], bn, 0)) |
| 367 | break; |
| 368 | } |
| 369 | if(rule->patterns[o] == NULL) |
| 370 | break; |
| 371 | } else if(rule->type == PAT_PATHNAME) { |
| 372 | for(o = 0; rule->patterns[o] != NULL; o++) { |
| 373 | if(!fnmatch(rule->patterns[o], file, FNM_PATHNAME)) |
| 374 | break; |
| 375 | } |
| 376 | if(rule->patterns[o] == NULL) |
| 377 | break; |
| 378 | } else if(rule->type == PAT_ALL) { |
| 379 | } else if(rule->type == PAT_DEFAULT) { |
| 380 | if(!trydefault) |
| 381 | break; |
| 382 | } |
| 383 | } |
| 384 | if(!rule) |
| 385 | return(pat); |
| 386 | } |
| 387 | } |
| 388 | return(NULL); |
| 389 | } |
| 390 | |
| 391 | static void handlefile(struct hthead *req, int fd, char *path) |
| 392 | { |
| 393 | struct pattern *pat; |
| 394 | struct child *ch; |
| 395 | |
| 396 | headappheader(req, "X-Ash-File", path); |
| 397 | if(((pat = findmatch(path, 0)) == NULL) && ((pat = findmatch(path, 1)) == NULL)) { |
| 398 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 399 | return; |
| 400 | } |
| 401 | if(pat->fchild) { |
| 402 | stdforkserve(pat->fchild, req, fd); |
| 403 | } else { |
| 404 | if((ch = findchild(path, pat->childnm)) == NULL) { |
| 405 | flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm); |
| 406 | simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm); |
| 407 | return; |
| 408 | } |
| 409 | if(childhandle(ch, req, fd)) |
| 410 | simpleerror(fd, 500, "Server Error", "The request handler crashed."); |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | static void handledir(struct hthead *req, int fd, char *path) |
| 415 | { |
| 416 | /* XXX: Todo */ |
| 417 | simpleerror(fd, 403, "Not Authorized", "Will not send directory listings or indices yet."); |
| 418 | } |
| 419 | |
| 420 | static int checkdir(struct hthead *req, int fd, char *path) |
| 421 | { |
| 422 | return(0); |
| 423 | } |
| 424 | |
| 425 | static void serve(struct hthead *req, int fd) |
| 426 | { |
| 427 | char *p, *p2, *path, *tmp, *buf, *p3, *nm; |
| 428 | struct stat sb; |
| 429 | DIR *dir; |
| 430 | struct dirent *dent; |
| 431 | |
| 432 | now = time(NULL); |
| 433 | nm = req->rest; |
| 434 | path = sstrdup("."); |
| 435 | p = nm; |
| 436 | while(1) { |
| 437 | if((p2 = strchr(p, '/')) == NULL) { |
| 438 | } else { |
| 439 | *(p2++) = 0; |
| 440 | } |
| 441 | |
| 442 | if(!*p) { |
| 443 | if(p2 == NULL) { |
| 444 | if(stat(path, &sb)) { |
| 445 | flog(LOG_WARNING, "failed to stat previously stated directory %s: %s", path, strerror(errno)); |
| 446 | simpleerror(fd, 500, "Internal Server Error", "The server encountered an unexpected condition."); |
| 447 | goto fail; |
| 448 | } |
| 449 | break; |
| 450 | } else { |
| 451 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 452 | goto fail; |
| 453 | } |
| 454 | } |
| 455 | if(*p == '.') { |
| 456 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 457 | goto fail; |
| 458 | } |
| 459 | |
| 460 | getconfig(path); |
| 461 | |
| 462 | /* |
| 463 | * First, check the name verbatimely: |
| 464 | */ |
| 465 | buf = sprintf3("%s/%s", path, p); |
| 466 | if(!stat(buf, &sb)) { |
| 467 | if(S_ISDIR(sb.st_mode)) { |
| 468 | tmp = path; |
| 469 | if(!strcmp(path, ".")) |
| 470 | path = sstrdup(p); |
| 471 | else |
| 472 | path = sprintf2("%s/%s", path, p); |
| 473 | free(tmp); |
| 474 | if(p2 == NULL) { |
| 475 | stdredir(req, fd, 301, sprintf3("%s/", p)); |
| 476 | goto out; |
| 477 | } |
| 478 | if(checkdir(req, fd, path)) |
| 479 | break; |
| 480 | goto next; |
| 481 | } |
| 482 | if(S_ISREG(sb.st_mode)) { |
| 483 | tmp = path; |
| 484 | path = sprintf2("%s/%s", path, p); |
| 485 | free(tmp); |
| 486 | break; |
| 487 | } |
| 488 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 489 | goto fail; |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Check the file extensionlessly: |
| 494 | */ |
| 495 | if(!strchr(p, '.') && ((dir = opendir(path)) != NULL)) { |
| 496 | while((dent = readdir(dir)) != NULL) { |
| 497 | buf = sprintf3("%s/%s", path, dent->d_name); |
| 498 | if((p3 = strchr(dent->d_name, '.')) != NULL) |
| 499 | *p3 = 0; |
| 500 | if(strcmp(dent->d_name, p)) |
| 501 | continue; |
| 502 | if(stat(buf, &sb)) |
| 503 | continue; |
| 504 | if(!S_ISREG(sb.st_mode)) |
| 505 | continue; |
| 506 | tmp = path; |
| 507 | path = sstrdup(buf); |
| 508 | free(tmp); |
| 509 | break; |
| 510 | } |
| 511 | closedir(dir); |
| 512 | if(dent != NULL) |
| 513 | break; |
| 514 | } |
| 515 | |
| 516 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 517 | goto fail; |
| 518 | |
| 519 | next: |
| 520 | if(p2 == NULL) |
| 521 | break; |
| 522 | p = p2; |
| 523 | } |
| 524 | if(p2 == NULL) |
| 525 | replrest(req, ""); |
| 526 | else |
| 527 | replrest(req, p2); |
| 528 | if(!strncmp(path, "./", 2)) |
| 529 | memmove(path, path + 2, strlen(path + 2) + 1); |
| 530 | if(S_ISDIR(sb.st_mode)) { |
| 531 | handledir(req, fd, path); |
| 532 | } else if(S_ISREG(sb.st_mode)) { |
| 533 | handlefile(req, fd, path); |
| 534 | } else { |
| 535 | simpleerror(fd, 404, "Not Found", "The requested URL has no corresponding resource."); |
| 536 | goto fail; |
| 537 | } |
| 538 | goto out; |
| 539 | |
| 540 | fail: |
| 541 | /* No special handling, for now at least. */ |
| 542 | out: |
| 543 | free(path); |
| 544 | } |
| 545 | |
| 546 | static void usage(FILE *out) |
| 547 | { |
| 548 | fprintf(out, "usage: dirplex [-hN] [-c CONFIG] DIR\n"); |
| 549 | } |
| 550 | |
| 551 | int main(int argc, char **argv) |
| 552 | { |
| 553 | int c; |
| 554 | int nodef; |
| 555 | char *gcf, *lcf; |
| 556 | struct hthead *req; |
| 557 | int fd; |
| 558 | |
| 559 | nodef = 0; |
| 560 | lcf = NULL; |
| 561 | while((c = getopt(argc, argv, "hNc:")) >= 0) { |
| 562 | switch(c) { |
| 563 | case 'h': |
| 564 | usage(stdout); |
| 565 | exit(0); |
| 566 | case 'N': |
| 567 | nodef = 1; |
| 568 | break; |
| 569 | case 'c': |
| 570 | lcf = optarg; |
| 571 | break; |
| 572 | default: |
| 573 | usage(stderr); |
| 574 | exit(1); |
| 575 | } |
| 576 | } |
| 577 | if(argc - optind < 1) { |
| 578 | usage(stderr); |
| 579 | exit(1); |
| 580 | } |
| 581 | if(!nodef) { |
| 582 | if((gcf = findstdconf("ashd/dirplex.rc")) != NULL) { |
| 583 | gconfig = readconfig(gcf); |
| 584 | free(gcf); |
| 585 | } |
| 586 | } |
| 587 | if(lcf != NULL) { |
| 588 | if((lconfig = readconfig(lcf)) == NULL) |
| 589 | exit(1); |
| 590 | } |
| 591 | if(chdir(argv[optind])) { |
| 592 | flog(LOG_ERR, "could not change directory to %s: %s", argv[optind], strerror(errno)); |
| 593 | exit(1); |
| 594 | } |
| 595 | signal(SIGCHLD, SIG_IGN); |
| 596 | while(1) { |
| 597 | if((fd = recvreq(0, &req)) < 0) { |
| 598 | if(errno != 0) |
| 599 | flog(LOG_ERR, "recvreq: %s", strerror(errno)); |
| 600 | break; |
| 601 | } |
| 602 | serve(req, fd); |
| 603 | freehthead(req); |
| 604 | close(fd); |
| 605 | } |
| 606 | return(0); |
| 607 | } |