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Contents of /hydra/src/util.c

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Revision 1.1 - (show annotations)
Sat Sep 21 13:53:50 2002 UTC (21 years, 6 months ago) by nmav
Branch: MAIN
Branch point for: boas
File MIME type: text/plain
Initial revision

1 /*
2 * Boa, an http server
3 * Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
4 * Some changes Copyright (C) 1996,97 Larry Doolittle <ldoolitt@boa.org>
5 * Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com>
6 * Some changes Copyright (C) 1996-99 Jon Nelson <jnelson@boa.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: util.c,v 1.61.2.3 2002/07/07 23:22:18 jnelson Exp $ */
25
26 #include "boa.h"
27
28 #define HEX_TO_DECIMAL(char1, char2) \
29 (((char1 >= 'A') ? (((char1 & 0xdf) - 'A') + 10) : (char1 - '0')) * 16) + \
30 (((char2 >= 'A') ? (((char2 & 0xdf) - 'A') + 10) : (char2 - '0')))
31
32 const char month_tab[48] =
33 "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
34 const char day_tab[] = "Sun,Mon,Tue,Wed,Thu,Fri,Sat,";
35
36 /*
37 * Name: clean_pathname
38 *
39 * Description: Replaces unsafe/incorrect instances of:
40 * //[...] with /
41 * /./ with /
42 * /../ with / (technically not what we want, but browsers should deal
43 * with this, not servers)
44 */
45
46 void clean_pathname(char *pathname)
47 {
48 char *cleanpath, c;
49
50 cleanpath = pathname;
51 while ((c = *pathname++)) {
52 if (c == '/') {
53 while (1) {
54 if (*pathname == '/')
55 pathname++;
56 else if (*pathname == '.' && *(pathname + 1) == '/')
57 pathname += 2;
58 else if (*pathname == '.' && *(pathname + 1) == '.' &&
59 *(pathname + 2) == '/') {
60 pathname += 3;
61 } else
62 break;
63 }
64 c = '/';
65 }
66 *cleanpath++ = c;
67 }
68
69 *cleanpath = '\0';
70 }
71
72 /*
73 * Name: get_commonlog_time
74 *
75 * Description: Returns the current time in common log format in a static
76 * char buffer.
77 *
78 * commonlog time is exactly 25 characters long
79 * because this is only used in logging, we add " [" before and "] " after
80 * making 29 characters
81 * "[27/Feb/1998:20:20:04 +0000] "
82 *
83 * Constrast with rfc822 time:
84 * "Sun, 06 Nov 1994 08:49:37 GMT"
85 *
86 * Altered 10 Jan 2000 by Jon Nelson ala Drew Streib for non UTC logging
87 *
88 */
89
90 char *get_commonlog_time(void)
91 {
92 struct tm *t;
93 char *p;
94 unsigned int a;
95 static char buf[30];
96 int time_offset;
97
98 if (use_localtime) {
99 t = localtime(&current_time);
100 time_offset = TIMEZONE_OFFSET(t);
101 } else {
102 t = gmtime(&current_time);
103 time_offset = 0;
104 }
105
106 p = buf + 29;
107 *p-- = '\0';
108 *p-- = ' ';
109 *p-- = ']';
110 a = abs(time_offset / 60);
111 *p-- = '0' + a % 10;
112 a /= 10;
113 *p-- = '0' + a % 6;
114 a /= 6;
115 *p-- = '0' + a % 10;
116 *p-- = '0' + a / 10;
117 *p-- = (time_offset >= 0) ? '+' : '-';
118 *p-- = ' ';
119
120 a = t->tm_sec;
121 *p-- = '0' + a % 10;
122 *p-- = '0' + a / 10;
123 *p-- = ':';
124 a = t->tm_min;
125 *p-- = '0' + a % 10;
126 *p-- = '0' + a / 10;
127 *p-- = ':';
128 a = t->tm_hour;
129 *p-- = '0' + a % 10;
130 *p-- = '0' + a / 10;
131 *p-- = ':';
132 a = 1900 + t->tm_year;
133 while (a) {
134 *p-- = '0' + a % 10;
135 a /= 10;
136 }
137 /* p points to an unused spot */
138 *p-- = '/';
139 p -= 2;
140 memcpy(p--, month_tab + 4 * (t->tm_mon), 3);
141 *p-- = '/';
142 a = t->tm_mday;
143 *p-- = '0' + a % 10;
144 *p-- = '0' + a / 10;
145 *p = '[';
146 return p; /* should be same as returning buf */
147 }
148
149 /*
150 * Name: month2int
151 *
152 * Description: Turns a three letter month into a 0-11 int
153 *
154 * Note: This function is from wn-v1.07 -- it's clever and fast
155 */
156
157 int month2int(char *monthname)
158 {
159 switch (*monthname) {
160 case 'A':
161 return (*++monthname == 'p' ? 3 : 7);
162 case 'D':
163 return (11);
164 case 'F':
165 return (1);
166 case 'J':
167 if (*++monthname == 'a')
168 return (0);
169 return (*++monthname == 'n' ? 5 : 6);
170 case 'M':
171 return (*(monthname + 2) == 'r' ? 2 : 4);
172 case 'N':
173 return (10);
174 case 'O':
175 return (9);
176 case 'S':
177 return (8);
178 default:
179 return (-1);
180 }
181 }
182
183 /*
184 * Name: modified_since
185 * Description: Decides whether a file's mtime is newer than the
186 * If-Modified-Since header of a request.
187 *
188
189 Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
190 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
191 Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
192 31 September 2000 23:59:59 GMT ; non-standard
193
194 * RETURN VALUES:
195 * 0: File has not been modified since specified time.
196 * 1: File has been.
197 * -1: Error!
198 */
199
200 int modified_since(time_t * mtime, char *if_modified_since)
201 {
202 struct tm *file_gmt;
203 char *ims_info;
204 char monthname[10 + 1];
205 int day, month, year, hour, minute, second;
206 int comp;
207
208 ims_info = if_modified_since;
209 while (*ims_info != ' ' && *ims_info != '\0')
210 ++ims_info;
211 if (*ims_info != ' ')
212 return -1;
213
214 /* the pre-space in the third scanf skips whitespace for the string */
215 if (sscanf(ims_info, "%d %3s %d %d:%d:%d GMT", /* RFC 1123 */
216 &day, monthname, &year, &hour, &minute, &second) == 6);
217 else if (sscanf(ims_info, "%d-%3s-%d %d:%d:%d GMT", /* RFC 1036 */
218 &day, monthname, &year, &hour, &minute, &second) == 6)
219 year += 1900;
220 else if (sscanf(ims_info, " %3s %d %d:%d:%d %d", /* asctime() format */
221 monthname, &day, &hour, &minute, &second, &year) == 6);
222 /* allow this non-standard date format: 31 September 2000 23:59:59 GMT */
223 /* NOTE: Use if_modified_since here, because the date *starts*
224 * with the day, versus a throwaway item
225 */
226 else if (sscanf(if_modified_since, "%d %10s %d %d:%d:%d GMT",
227 &day, monthname, &year, &hour, &minute, &second) == 6);
228 else {
229 log_error_time();
230 fprintf(stderr, "Error in %s, line %d: Unable to sscanf \"%s\"\n",
231 __FILE__, __LINE__, ims_info);
232 return -1; /* error */
233 }
234
235 file_gmt = gmtime(mtime);
236 month = month2int(monthname);
237
238 /* Go through from years to seconds -- if they are ever unequal,
239 we know which one is newer and can return */
240
241 if ((comp = 1900 + file_gmt->tm_year - year))
242 return (comp > 0);
243 if ((comp = file_gmt->tm_mon - month))
244 return (comp > 0);
245 if ((comp = file_gmt->tm_mday - day))
246 return (comp > 0);
247 if ((comp = file_gmt->tm_hour - hour))
248 return (comp > 0);
249 if ((comp = file_gmt->tm_min - minute))
250 return (comp > 0);
251 if ((comp = file_gmt->tm_sec - second))
252 return (comp > 0);
253
254 return 0; /* this person must really be into the latest/greatest */
255 }
256
257
258 /*
259 * Name: to_upper
260 *
261 * Description: Turns a string into all upper case (for HTTP_ header forming)
262 * AND changes - into _
263 */
264
265 char *to_upper(char *str)
266 {
267 char *start = str;
268
269 while (*str) {
270 if (*str == '-')
271 *str = '_';
272 else
273 *str = toupper(*str);
274
275 str++;
276 }
277
278 return start;
279 }
280
281 /*
282 * Name: unescape_uri
283 *
284 * Description: Decodes a uri, changing %xx encodings with the actual
285 * character. The query_string should already be gone.
286 *
287 * Return values:
288 * 1: success
289 * 0: illegal string
290 */
291
292 int unescape_uri(char *uri, char ** query_string)
293 {
294 char c, d;
295 char *uri_old;
296
297 uri_old = uri;
298
299 while ((c = *uri_old)) {
300 if (c == '%') {
301 uri_old++;
302 if ((c = *uri_old++) && (d = *uri_old++))
303 *uri++ = HEX_TO_DECIMAL(c, d);
304 else
305 return 0; /* NULL in chars to be decoded */
306 } else if (c == '?') { /* query string */
307 if (query_string)
308 *query_string = ++uri_old;
309 /* stop here */
310 *uri = '\0';
311 return(1);
312 break;
313 } else if (c == '#') { /* fragment */
314 /* legal part of URL, but we do *not* care.
315 * However, we still have to look for the query string */
316 if (query_string) {
317 ++uri_old;
318 while((c = *uri_old)) {
319 if (c == '?') {
320 *query_string = ++uri_old;
321 break;
322 }
323 ++uri_old;
324 }
325 }
326 break;
327 } else {
328 *uri++ = c;
329 uri_old++;
330 }
331 }
332
333 *uri = '\0';
334 return 1;
335 }
336
337 /* rfc822 (1123) time is exactly 29 characters long
338 * "Sun, 06 Nov 1994 08:49:37 GMT"
339 */
340
341 void rfc822_time_buf(char *buf, time_t s)
342 {
343 struct tm *t;
344 char *p;
345 unsigned int a;
346
347 if (!s) {
348 t = gmtime(&current_time);
349 } else
350 t = gmtime(&s);
351
352 p = buf + 28;
353 /* p points to the last char in the buf */
354
355 p -= 3;
356 /* p points to where the ' ' will go */
357 memcpy(p--, " GMT", 4);
358
359 a = t->tm_sec;
360 *p-- = '0' + a % 10;
361 *p-- = '0' + a / 10;
362 *p-- = ':';
363 a = t->tm_min;
364 *p-- = '0' + a % 10;
365 *p-- = '0' + a / 10;
366 *p-- = ':';
367 a = t->tm_hour;
368 *p-- = '0' + a % 10;
369 *p-- = '0' + a / 10;
370 *p-- = ' ';
371 a = 1900 + t->tm_year;
372 while (a) {
373 *p-- = '0' + a % 10;
374 a /= 10;
375 }
376 /* p points to an unused spot to where the space will go */
377 p -= 3;
378 /* p points to where the first char of the month will go */
379 memcpy(p--, month_tab + 4 * (t->tm_mon), 4);
380 *p-- = ' ';
381 a = t->tm_mday;
382 *p-- = '0' + a % 10;
383 *p-- = '0' + a / 10;
384 *p-- = ' ';
385 p -= 3;
386 memcpy(p, day_tab + t->tm_wday * 4, 4);
387 }
388
389 char *simple_itoa(unsigned int i)
390 {
391 /* 21 digits plus null terminator, good for 64-bit or smaller ints
392 * for bigger ints, use a bigger buffer!
393 *
394 * 4294967295 is, incidentally, MAX_UINT (on 32bit systems at this time)
395 * and is 10 bytes long
396 */
397 static char local[22];
398 char *p = &local[21];
399 *p-- = '\0';
400 do {
401 *p-- = '0' + i % 10;
402 i /= 10;
403 } while (i > 0);
404 return p + 1;
405 }
406
407 /* I don't "do" negative conversions
408 * Therefore, -1 indicates error
409 */
410
411 int boa_atoi(char *s)
412 {
413 int retval;
414 char *reconv;
415
416 if (!isdigit(*s))
417 return -1;
418
419 retval = atoi(s);
420 if (retval < 0)
421 return -1;
422
423 reconv = simple_itoa(retval);
424 if (memcmp(s,reconv,strlen(s)) != 0) {
425 return -1;
426 }
427 return retval;
428 }
429
430 int create_temporary_file(short want_unlink, char *storage, int size)
431 {
432 static char boa_tempfile[MAX_PATH_LENGTH + 1];
433 int fd;
434
435 snprintf(boa_tempfile, MAX_PATH_LENGTH,
436 "%s/boa-temp.XXXXXX", tempdir);
437
438 /* open temp file */
439 fd = mkstemp(boa_tempfile);
440 if (fd == -1) {
441 log_error_time();
442 perror("mkstemp");
443 return 0;
444 }
445
446 if (storage != NULL) {
447 int len = strlen(boa_tempfile);
448
449 if (len < size) {
450 memcpy(storage, boa_tempfile, len + 1);
451 } else {
452 close(fd);
453 fd = 0;
454 log_error_time();
455 fprintf(stderr, "not enough memory for memcpy in storage\n");
456 want_unlink = 1;
457 }
458 }
459
460 if (want_unlink) {
461 if (unlink(boa_tempfile) == -1) {
462 close(fd);
463 fd = 0;
464 log_error_time();
465 fprintf(stderr, "unlink temp file\n");
466 }
467 }
468
469 return (fd);
470 }
471
472 /*
473 * Name: normalize_path
474 *
475 * Description: Makes sure relative paths are made absolute
476 *
477 */
478
479 #define DIRBUF_SIZE MAX_PATH_LENGTH * 2 + 1
480 char * normalize_path(char *path)
481 {
482 char dirbuf[DIRBUF_SIZE];
483 int len1, len2;
484 char *endpath;
485
486 if (path[0] == '/') {
487 endpath = strdup(path);
488 } else {
489
490 #ifndef HAVE_GETCWD
491 perror("boa: getcwd() not defined. Aborting.");
492 exit(1);
493 #endif
494 if (getcwd(dirbuf, DIRBUF_SIZE) == NULL) {
495 if (errno == ERANGE)
496 perror
497 ("boa: getcwd() failed - unable to get working directory. "
498 "Aborting.");
499 else if (errno == EACCES)
500 perror("boa: getcwd() failed - No read access in current "
501 "directory. Aborting.");
502 else
503 perror("boa: getcwd() failed - unknown error. Aborting.");
504 exit(1);
505 }
506
507 /* OK, now the hard part. */
508 len1 = strlen(dirbuf);
509 len2 = strlen(path);
510 if (len1 + len2 > MAX_PATH_LENGTH * 2) {
511 perror("boa: eek. unable to normalize pathname");
512 exit(1);
513 }
514 if (strcmp(path,".") != 0) {
515 memcpy(dirbuf + len1, "/", 1);
516 memcpy(dirbuf + len1 + 1, path, len2 + 1);
517 }
518 /* fprintf(stderr, "boa: normalize gets \"%s\"\n", dirbuf); */
519
520 endpath = strdup(dirbuf);
521 }
522
523 if (endpath == NULL) {
524 fprintf(stderr,
525 "boa: Cannot strdup path. Aborting.\n");
526 exit(1);
527 }
528 return endpath;
529 }
530
531 int real_set_block_fd(int fd)
532 {
533 int flags;
534
535 flags = fcntl(fd, F_GETFL);
536 if (flags == -1)
537 return -1;
538
539 flags &= ~O_NONBLOCK;
540 flags = fcntl(fd, F_SETFL, flags);
541 return flags;
542 }
543
544 int real_set_nonblock_fd(int fd)
545 {
546 int flags;
547
548 flags = fcntl(fd, F_GETFL);
549 if (flags == -1)
550 return -1;
551
552 flags |= O_NONBLOCK;
553 flags = fcntl(fd, F_SETFL, flags);
554 return flags;
555 }

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