/[hydra]/hydra/src/get.c
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Revision 1.29 - (show annotations)
Tue Oct 29 12:13:54 2002 UTC (21 years, 5 months ago) by nmav
Branch: MAIN
CVS Tags: hydra_0_0_10, hydra_0_1_2, hydra_0_1_1, hydra_0_1_0
Branch point for: hydra_0_1_0_patches
Changes since 1.28: +8 -2 lines
File MIME type: text/plain
*** empty log message ***

1 /*
2 * Hydra, an http server
3 * Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
4 * Some changes Copyright (C) 1996,99 Larry Doolittle <ldoolitt@boa.org>
5 * Some changes Copyright (C) 1996-2002 Jon Nelson <jnelson@boa.org>
6 * Portions Copyright (C) 2002 Nikos Mavroyanopoulos <nmav@gnutls.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 1, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 */
23
24 /* $Id: get.c,v 1.28 2002/10/27 10:06:28 nmav Exp $*/
25
26 #include "boa.h"
27 #include "socket.h"
28 #include "access.h"
29
30 /* local prototypes */
31 int get_cachedir_file(request * req, stat_st *statbuf);
32 int index_directory(request * req, char *dest_filename);
33 static int check_if_stuff(request * req);
34
35 /*
36 * Name: init_get
37 * Description: Initializes a non-script GET or HEAD request.
38 *
39 * Return values:
40 * 0: finished or error, request will be freed
41 * 1: successfully initialized, added to ready queue
42 */
43
44 int init_get(server_params * params, request * req)
45 {
46 int data_fd, saved_errno;
47 stat_st statbuf;
48 volatile int bytes;
49
50 #ifdef ENABLE_ACCESS_LISTS
51 if (!access_allow(req->hostname, req->pathname)) {
52 send_r_forbidden(req);
53 return 0;
54 }
55 #endif
56
57 data_fd = open(req->pathname, O_RDONLY);
58 saved_errno = errno; /* might not get used */
59
60 if (data_fd == -1) {
61 log_error_doc(req);
62 errno = saved_errno;
63 perror("document open");
64
65 if (saved_errno == ENOENT)
66 send_r_not_found(req);
67 else if (saved_errno == EACCES)
68 send_r_forbidden(req);
69 else
70 send_r_bad_request(req);
71 return 0;
72 }
73
74 if (fstat(data_fd, &statbuf) == -1) {
75 /* this is quite impossible, since the file
76 * was opened before.
77 */
78 close(data_fd);
79 send_r_not_found(req);
80 return 0;
81 }
82
83 if (S_ISDIR(statbuf.st_mode)) { /* directory */
84 close(data_fd); /* close dir */
85
86 if (req->pathname[strlen(req->pathname) - 1] != '/') {
87 char buffer[3 * MAX_PATH_LENGTH + 128];
88 char * hostname;
89
90 if (req->hostname==NULL)
91 hostname = req->local_ip_addr;
92 else
93 hostname = req->hostname;
94
95 create_url(buffer, sizeof(buffer), req->secure, hostname,
96 params->server_s[req->secure].port, req->request_uri);
97
98 send_r_moved_perm(req, buffer);
99 return 0;
100 }
101 data_fd = get_dir(req, &statbuf); /* updates statbuf */
102
103 if (data_fd == -1) /* couldn't do it */
104 return 0; /* errors reported by get_dir */
105 else if (data_fd <= 1)
106 /* data_fd == 0 -> close it down, 1 -> continue */
107 return data_fd;
108 /* else, data_fd contains the fd of the file... */
109 }
110
111 req->filesize = statbuf.st_size;
112 req->last_modified = statbuf.st_mtime;
113
114 /* Check the If-Match, If-Modified etc stuff.
115 */
116 if (req->if_types)
117 if (check_if_stuff(req) == 0) {
118 close(data_fd);
119 return 0;
120 }
121 /* Move on */
122
123 if (req->range_stop == 0)
124 req->range_stop = statbuf.st_size;
125
126 /* out of range! */
127 if (req->range_start > statbuf.st_size ||
128 req->range_stop > statbuf.st_size ||
129 req->range_stop < req->range_start) {
130 send_r_range_unsatisfiable(req);
131 close(data_fd);
132 return 0;
133 }
134
135 if (req->method == M_HEAD || req->filesize == 0) {
136 send_r_request_file_ok(req);
137 close(data_fd);
138 return 0;
139 }
140
141 req->filepos = req->range_start;
142
143 if (req->range_stop > max_file_size_cache) {
144
145 if (req->range_start == 0 && req->range_stop == statbuf.st_size)
146 send_r_request_file_ok(req); /* All's well */
147 else {
148 /* if ranges were used, then lseek to the start given
149 */
150 if (lseek(data_fd, req->range_start, SEEK_SET) == (off_t) - 1) {
151 close(data_fd);
152 send_r_not_found(req);
153 return 0;
154 }
155 send_r_request_partial(req); /* All's well */
156 }
157
158 req_flush(req); /* this should *always* complete due to
159 the size of the I/O buffers */
160 req->data_fd = data_fd;
161
162 if (req->secure) {
163 req->status = PIPE_READ;
164 req->cgi_status = CGI_BUFFER;
165 } else {
166 /* This sends data directly to the socket, and cannot
167 * be used in TLS connections.
168 */
169 req->status = IOSHUFFLE;
170 }
171
172 req->header_line = req->header_end = req->buffer;
173 req->pipe_range_stop = req->range_stop;
174 return 1;
175 }
176
177 if (req->range_stop == 0) { /* done */
178 send_r_request_file_ok(req); /* All's well *so far* */
179 close(data_fd);
180 return 1;
181 }
182
183 /* NOTE: I (Jon Nelson) tried performing a read(2)
184 * into the output buffer provided the file data would
185 * fit, before mmapping, and if successful, writing that
186 * and stopping there -- all to avoid the cost
187 * of a mmap. Oddly, it was *slower* in benchmarks.
188 */
189 if (max_files_cache > 0) {
190 req->mmap_entry_var = find_mmap(data_fd, &statbuf);
191 if (req->mmap_entry_var == NULL) {
192 req->buffer_end = 0;
193 if (errno == ENOENT)
194 send_r_not_found(req);
195 else if (errno == EACCES)
196 send_r_forbidden(req);
197 else
198 send_r_bad_request(req);
199 close(data_fd);
200 return 0;
201 }
202 req->data_mem = req->mmap_entry_var->mmap;
203 } else { /* File caching is disabled.
204 */
205 req->data_mem =
206 mmap(0, req->range_stop, PROT_READ, MAP_OPTIONS, data_fd, 0);
207 }
208
209 close(data_fd); /* close data file */
210
211 if (req->data_mem == MAP_FAILED) {
212 boa_perror(req, "mmap");
213 return 0;
214 }
215
216 if (req->range_start == 0 && req->range_stop == statbuf.st_size)
217 send_r_request_file_ok(req); /* All's well */
218 else
219 send_r_request_partial(req); /* All's well */
220
221 bytes = BUFFER_SIZE - req->buffer_end;
222
223 /* bytes is now how much the buffer can hold
224 * after the headers
225 */
226
227 if (bytes > 0) {
228 if (bytes > req->range_stop - req->range_start)
229 bytes = req->range_stop - req->range_start;
230
231 if (setjmp(params->env) == 0) {
232 params->handle_sigbus = 1;
233 memcpy(req->buffer + req->buffer_end,
234 &req->data_mem[req->filepos], bytes);
235 params->handle_sigbus = 0;
236 /* OK, SIGBUS **after** this point is very bad! */
237 } else {
238 char buf[30];
239 /* sigbus! */
240 log_error_doc(req);
241 reset_output_buffer(req);
242 send_r_error(req);
243 get_commonlog_time(buf);
244 fprintf(stderr, "%sGot SIGBUS in memcpy!\n", buf);
245 return 0;
246 }
247 req->buffer_end += bytes;
248 req->filepos += bytes;
249 if (req->range_stop == req->filepos) {
250 req_flush(req);
251 req->status = DONE;
252 }
253 }
254
255 /* We lose statbuf here, so make sure response has been sent */
256 return 1;
257 }
258
259 /*
260 * Name: check_if_stuff
261 * Description: Checks the If-Match, If-None-Match headers
262 *
263 * req->last_modified, and req->filesize MUST have been set
264 * before calling this function. This function should be called
265 * if req->if_types != 0.
266 *
267 * Return values:
268 * 1: Successful, continue sending the file
269 * 0: unsuccessful. We send the appropriate stuff. Close the connection.
270 */
271
272 static int check_if_stuff(request * req)
273 {
274 int comp = 0;
275 char *broken_etag[MAX_COMMA_SEP_ELEMENTS];
276 int broken_etag_size, i;
277 char new_etag[MAX_ETAG_LENGTH];
278
279 /* Although we allow multiple If-* directives to be used, we
280 * actually use only one. The priority used is shown below.
281 */
282
283 /* First try IF_MODIFIED_SINCE
284 */
285 if (req->if_types & IF_MODIFIED_SINCE) {
286 if (!modified_since(req->last_modified, req->if_modified_since)) {
287 send_r_not_modified(req);
288 return 0;
289 }
290 return 1;
291 }
292
293
294 /* Then try IF_MATCH
295 */
296 if (req->if_types & IF_MATCH) {
297
298 /* Check for the "*"
299 */
300 if (strncmp(req->if_match_etag, "\"*\"", 3) == 0) {
301 comp = 0; /* comparison is always ok */
302 } else {
303
304 /* Create the current ETag of the file.
305 */
306 create_etag(req->filesize, req->last_modified, new_etag);
307
308 /* Check if one of the ETags sent, match ours
309 */
310 break_comma_list(req->if_match_etag, broken_etag,
311 &broken_etag_size);
312
313 comp = 1;
314 for (i = 0; i < broken_etag_size; i++) {
315 comp = strcmp(broken_etag[i], new_etag);
316 if (comp == 0) /* matches! */
317 break;
318 }
319
320
321 }
322
323 if (comp == 0)
324 return 1;
325 send_r_precondition_failed(req);
326 return 0;
327 }
328
329 /* Then try IF_RANGE
330 */
331 if (req->if_types & IF_RANGE) {
332 if (req->if_range_etag[0] == '"') { /* ETag may contain a date, if If-Range
333 * was used.
334 */
335 /* Check for the "*"
336 */
337 if (strncmp(req->if_range_etag, "\"*\"", 3) == 0) {
338 comp = 0; /* comparison is always ok */
339 } else {
340
341 /* Create the current ETag
342 */
343 create_etag(req->filesize, req->last_modified, new_etag);
344
345 /* Check if one of the ETags sent, match ours
346 */
347
348 break_comma_list(req->if_range_etag, broken_etag,
349 &broken_etag_size);
350
351 comp = 1;
352 for (i = 0; i < broken_etag_size; i++) {
353 comp = strcmp(broken_etag[i], new_etag);
354 if (comp == 0) /* matches! */
355 break;
356 }
357
358
359 }
360 } else {
361 comp = modified_since(req->last_modified, req->if_range_etag);
362 }
363
364
365 /* File didn't change */
366 if (comp == 0)
367 return 1;
368
369 /* File has been changed, but it is Ok, so send the whole
370 * file.
371 */
372 req->range_start = req->range_stop = 0;
373 return 1;
374 }
375
376 /* Then try IF_NONE_MATCH
377 */
378 if (req->if_types & IF_NONE_MATCH) {
379 /* Check for the "*"
380 */
381 if (strncmp(req->if_none_match_etag, "\"*\"", 3) == 0) {
382 comp = 0; /* comparison is always ok */
383 } else {
384
385 /* Create the current ETag
386 */
387 create_etag(req->filesize, req->last_modified, new_etag);
388
389 /* Check if one of the ETags sent, match ours
390 */
391
392 break_comma_list(req->if_none_match_etag, broken_etag,
393 &broken_etag_size);
394
395 comp = 1;
396 for (i = 0; i < broken_etag_size; i++) {
397 comp = strcmp(broken_etag[i], new_etag);
398 if (comp == 0) /* matches! */
399 break;
400 }
401
402
403 }
404
405 if (comp == 0) {
406 send_r_not_modified(req);
407 return 0;
408 } else { /* it was modified */
409 send_r_precondition_failed(req);
410 return 0;
411 }
412 }
413
414 /* Unsupported type ? */
415
416 return 1; /* do the request */
417 }
418
419 /*
420 * Name: process_get
421 * Description: Writes a chunk of data to the socket.
422 *
423 * Return values:
424 * -1: request blocked, move to blocked queue
425 * 0: EOF or error, close it down
426 * 1: successful write, recycle in ready queue
427 */
428
429 int process_get(server_params * params, request * req)
430 {
431 int bytes_written;
432 volatile int bytes_to_write;
433
434 bytes_to_write = req->range_stop - req->filepos;
435 if (bytes_to_write > system_bufsize)
436 bytes_to_write = system_bufsize;
437
438
439 if (setjmp(params->env) == 0) {
440 params->handle_sigbus = 1;
441
442 bytes_written =
443 socket_send(req, req->data_mem + req->filepos, bytes_to_write);
444
445 params->handle_sigbus = 0;
446 /* OK, SIGBUS **after** this point is very bad! */
447 } else {
448 char buf[30];
449 /* sigbus! */
450 log_error_doc(req);
451 /* sending an error here is inappropriate
452 * if we are here, the file is mmapped, and thus,
453 * a content-length has been sent. If we send fewer bytes
454 * the client knows there has been a problem.
455 * We run the risk of accidentally sending the right number
456 * of bytes (or a few too many) and the client
457 * won't be the wiser.
458 */
459 req->status = DEAD;
460 get_commonlog_time(buf);
461 fprintf(stderr, "%sGot SIGBUS in write(2)!\n", buf);
462 return 0;
463 }
464
465 if (bytes_written < 0) {
466 if (errno == EWOULDBLOCK || errno == EAGAIN)
467 return -1;
468 /* request blocked at the pipe level, but keep going */
469 else {
470 if (errno != EPIPE) {
471 log_error_doc(req);
472 /* Can generate lots of log entries, */
473 perror("write");
474 /* OK to disable if your logs get too big */
475 }
476 req->status = DEAD;
477 return 0;
478 }
479 }
480 req->filepos += bytes_written;
481
482 if (req->filepos == req->range_stop) { /* EOF */
483 return 0;
484 } else
485 return 1; /* more to do */
486 }
487
488 /*
489 * Name: get_dir
490 * Description: Called from process_get if the request is a directory.
491 * statbuf must describe directory on input, since we may need its
492 * device, inode, and mtime.
493 * statbuf is updated, since we may need to check mtimes of a cache.
494 * returns:
495 * -1 error
496 * 0 cgi (either gunzip or auto-generated)
497 * >0 file descriptor of file
498 */
499
500 int get_dir(request * req, stat_st *statbuf)
501 {
502
503 char *directory_index;
504 int data_fd;
505
506 directory_index =
507 find_and_open_directory_index(req->pathname, 0, &data_fd);
508
509 if (directory_index) { /* look for index.html first?? */
510 if (data_fd != -1) { /* user's index file */
511 int ret;
512
513 /* Check if we can execute the file
514 */
515
516 strcat(req->request_uri, directory_index);
517
518 ret = is_executable_cgi(req, directory_index);
519 if (ret != 0) { /* it is a CGI */
520 close(data_fd); /* we don't need it */
521 if (ret == -1) {
522 send_r_not_found(req);
523 return -1;
524 }
525 return init_cgi(req);
526 }
527
528 /* Not a cgi */
529
530 fstat(data_fd, statbuf);
531 return data_fd;
532 }
533 if (errno == EACCES) {
534 send_r_forbidden(req);
535 return -1;
536 } else if (errno != ENOENT) {
537 /* if there is an error *other* than EACCES or ENOENT */
538 send_r_not_found(req);
539 return -1;
540 }
541 }
542
543 /* only here if index.html, index.html.gz don't exist */
544 if (dirmaker != NULL) { /* don't look for index.html... maybe automake? */
545 req->response_status = R_REQUEST_OK;
546 SQUASH_KA(req);
547
548 /* the indexer should take care of all headers */
549 if (!req->simple) {
550 req_write(req, HTTP_VERSION " 200 OK\r\n");
551 print_http_headers(req);
552 print_last_modified(req);
553 req_write(req, "Content-Type: " TEXT_HTML CRLF CRLF);
554 req_flush(req);
555 }
556 if (req->method == M_HEAD)
557 return 0;
558
559 req->is_cgi = INDEXER_CGI;
560 return init_cgi(req);
561 /* in this case, 0 means success */
562 } else if (cachedir) {
563 return get_cachedir_file(req, statbuf);
564 } else { /* neither index.html nor autogenerate are allowed */
565 send_r_forbidden(req);
566 return -1; /* nothing worked */
567 }
568 }
569
570 int get_cachedir_file(request * req, stat_st *statbuf)
571 {
572
573 char pathname_with_index[MAX_PATH_LENGTH];
574 int data_fd;
575 time_t real_dir_mtime;
576
577 real_dir_mtime = statbuf->st_mtime;
578 sprintf(pathname_with_index, "%s/dir.%u.%lu",
579 cachedir, (unsigned int) statbuf->st_dev,
580 (unsigned long int)statbuf->st_ino);
581 data_fd = open(pathname_with_index, O_RDONLY);
582
583 if (data_fd != -1) { /* index cache */
584
585 fstat(data_fd, statbuf);
586 if (statbuf->st_mtime > real_dir_mtime) {
587 statbuf->st_mtime = real_dir_mtime; /* lie */
588 strcpy(req->request_uri, find_default_directory_index()); /* for mimetype */
589 return data_fd;
590 }
591 close(data_fd);
592 unlink(pathname_with_index); /* cache is stale, delete it */
593 }
594 if (index_directory(req, pathname_with_index) == -1)
595 return -1;
596
597 data_fd = open(pathname_with_index, O_RDONLY); /* Last chance */
598 if (data_fd != -1) {
599 strcpy(req->request_uri, find_default_directory_index()); /* for mimetype */
600 fstat(data_fd, statbuf);
601 statbuf->st_mtime = real_dir_mtime; /* lie */
602 return data_fd;
603 }
604
605 boa_perror(req, "re-opening dircache");
606 return -1; /* Nothing worked. */
607
608 }
609
610 /*
611 * Name: index_directory
612 * Description: Called from get_cachedir_file if a directory html
613 * has to be generated on the fly
614 * returns -1 for problem, else 0
615 * This version is the fastest, ugliest, and most accurate yet.
616 * It solves the "stale size or type" problem by not ever giving
617 * the size or type. This also speeds it up since no per-file
618 * stat() is required.
619 */
620
621 int index_directory(request * req, char *dest_filename)
622 {
623 DIR *request_dir;
624 FILE *fdstream;
625 struct dirent *dirbuf;
626 int bytes = 0;
627 char *escname = NULL;
628
629 if (chdir(req->pathname) == -1) {
630 if (errno == EACCES || errno == EPERM) {
631 send_r_forbidden(req);
632 } else {
633 log_error_doc(req);
634 perror("chdir");
635 send_r_bad_request(req);
636 }
637 return -1;
638 }
639
640 request_dir = opendir(".");
641 if (request_dir == NULL) {
642 int errno_save = errno;
643 send_r_error(req);
644 log_error_time();
645 fprintf(stderr, "directory \"%s\": ", req->pathname);
646 errno = errno_save;
647 perror("opendir");
648 return -1;
649 }
650
651 fdstream = fopen(dest_filename, "w");
652 if (fdstream == NULL) {
653 boa_perror(req, "dircache fopen");
654 closedir(request_dir);
655 return -1;
656 }
657
658 bytes += fprintf(fdstream,
659 "<HTML><HEAD>\n<TITLE>Index of %s</TITLE>\n</HEAD>\n\n",
660 req->request_uri);
661 bytes +=
662 fprintf(fdstream, "<BODY>\n\n<H2>Index of %s</H2>\n\n<PRE>\n",
663 req->request_uri);
664
665 while ((dirbuf = readdir(request_dir))) {
666 if (!strcmp(dirbuf->d_name, "."))
667 continue;
668
669 if (!strcmp(dirbuf->d_name, "..")) {
670 bytes += fprintf(fdstream,
671 " [DIR] <A HREF=\"../\">Parent Directory</A>\n");
672 continue;
673 }
674
675 if ((escname = escape_string(dirbuf->d_name, NULL)) != NULL) {
676 bytes += fprintf(fdstream, " <A HREF=\"%s\">%s</A>\n",
677 escname, dirbuf->d_name);
678 free(escname);
679 escname = NULL;
680 }
681 }
682 closedir(request_dir);
683 bytes += fprintf(fdstream, "</PRE>\n\n</BODY>\n</HTML>\n");
684
685 fclose(fdstream);
686
687 chdir(server_root);
688
689 req->filesize = bytes; /* for logging transfer size */
690 return 0; /* success */
691 }

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