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3c0ef626 | 1 | /* |
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
665a873d | 3 | * Copyright (c) 2005 Damien Miller. All rights reserved. |
3c0ef626 | 4 | * |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
16 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
17 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
18 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
19 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
20 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
21 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
23 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
665a873d | 27 | RCSID("$OpenBSD: misc.c,v 1.34 2005/07/08 09:26:18 dtucker Exp $"); |
3c0ef626 | 28 | |
29 | #include "misc.h" | |
30 | #include "log.h" | |
31 | #include "xmalloc.h" | |
32 | ||
33 | /* remove newline at end of string */ | |
34 | char * | |
35 | chop(char *s) | |
36 | { | |
37 | char *t = s; | |
38 | while (*t) { | |
e9a17296 | 39 | if (*t == '\n' || *t == '\r') { |
3c0ef626 | 40 | *t = '\0'; |
41 | return s; | |
42 | } | |
43 | t++; | |
44 | } | |
45 | return s; | |
46 | ||
47 | } | |
48 | ||
49 | /* set/unset filedescriptor to non-blocking */ | |
c9f39d2c | 50 | int |
3c0ef626 | 51 | set_nonblock(int fd) |
52 | { | |
53 | int val; | |
54 | ||
55 | val = fcntl(fd, F_GETFL, 0); | |
56 | if (val < 0) { | |
57 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
c9f39d2c | 58 | return (-1); |
3c0ef626 | 59 | } |
60 | if (val & O_NONBLOCK) { | |
c9f39d2c | 61 | debug3("fd %d is O_NONBLOCK", fd); |
62 | return (0); | |
3c0ef626 | 63 | } |
0fff78ff | 64 | debug2("fd %d setting O_NONBLOCK", fd); |
3c0ef626 | 65 | val |= O_NONBLOCK; |
c9f39d2c | 66 | if (fcntl(fd, F_SETFL, val) == -1) { |
67 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, | |
68 | strerror(errno)); | |
69 | return (-1); | |
70 | } | |
71 | return (0); | |
3c0ef626 | 72 | } |
73 | ||
c9f39d2c | 74 | int |
3c0ef626 | 75 | unset_nonblock(int fd) |
76 | { | |
77 | int val; | |
78 | ||
79 | val = fcntl(fd, F_GETFL, 0); | |
80 | if (val < 0) { | |
81 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
c9f39d2c | 82 | return (-1); |
3c0ef626 | 83 | } |
84 | if (!(val & O_NONBLOCK)) { | |
c9f39d2c | 85 | debug3("fd %d is not O_NONBLOCK", fd); |
86 | return (0); | |
3c0ef626 | 87 | } |
88 | debug("fd %d clearing O_NONBLOCK", fd); | |
89 | val &= ~O_NONBLOCK; | |
c9f39d2c | 90 | if (fcntl(fd, F_SETFL, val) == -1) { |
91 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", | |
e9a17296 | 92 | fd, strerror(errno)); |
c9f39d2c | 93 | return (-1); |
94 | } | |
95 | return (0); | |
e9a17296 | 96 | } |
97 | ||
98 | /* disable nagle on socket */ | |
99 | void | |
100 | set_nodelay(int fd) | |
101 | { | |
102 | int opt; | |
103 | socklen_t optlen; | |
104 | ||
105 | optlen = sizeof opt; | |
106 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { | |
cdd66111 | 107 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
e9a17296 | 108 | return; |
109 | } | |
110 | if (opt == 1) { | |
111 | debug2("fd %d is TCP_NODELAY", fd); | |
112 | return; | |
113 | } | |
114 | opt = 1; | |
6a9b3198 | 115 | debug2("fd %d setting TCP_NODELAY", fd); |
e9a17296 | 116 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) |
117 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); | |
3c0ef626 | 118 | } |
119 | ||
120 | /* Characters considered whitespace in strsep calls. */ | |
121 | #define WHITESPACE " \t\r\n" | |
122 | ||
123 | /* return next token in configuration line */ | |
124 | char * | |
125 | strdelim(char **s) | |
126 | { | |
127 | char *old; | |
128 | int wspace = 0; | |
129 | ||
130 | if (*s == NULL) | |
131 | return NULL; | |
132 | ||
133 | old = *s; | |
134 | ||
135 | *s = strpbrk(*s, WHITESPACE "="); | |
136 | if (*s == NULL) | |
137 | return (old); | |
138 | ||
139 | /* Allow only one '=' to be skipped */ | |
140 | if (*s[0] == '=') | |
141 | wspace = 1; | |
142 | *s[0] = '\0'; | |
143 | ||
144 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
145 | if (*s[0] == '=' && !wspace) | |
146 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
147 | ||
148 | return (old); | |
149 | } | |
150 | ||
151 | struct passwd * | |
152 | pwcopy(struct passwd *pw) | |
153 | { | |
154 | struct passwd *copy = xmalloc(sizeof(*copy)); | |
155 | ||
156 | memset(copy, 0, sizeof(*copy)); | |
157 | copy->pw_name = xstrdup(pw->pw_name); | |
158 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
159 | copy->pw_gecos = xstrdup(pw->pw_gecos); | |
160 | copy->pw_uid = pw->pw_uid; | |
161 | copy->pw_gid = pw->pw_gid; | |
162 | #ifdef HAVE_PW_EXPIRE_IN_PASSWD | |
163 | copy->pw_expire = pw->pw_expire; | |
164 | #endif | |
165 | #ifdef HAVE_PW_CHANGE_IN_PASSWD | |
166 | copy->pw_change = pw->pw_change; | |
167 | #endif | |
168 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
169 | copy->pw_class = xstrdup(pw->pw_class); | |
170 | #endif | |
171 | copy->pw_dir = xstrdup(pw->pw_dir); | |
172 | copy->pw_shell = xstrdup(pw->pw_shell); | |
173 | return copy; | |
174 | } | |
175 | ||
176 | /* | |
177 | * Convert ASCII string to TCP/IP port number. | |
178 | * Port must be >0 and <=65535. | |
179 | * Return 0 if invalid. | |
180 | */ | |
181 | int | |
182 | a2port(const char *s) | |
183 | { | |
184 | long port; | |
185 | char *endp; | |
186 | ||
187 | errno = 0; | |
188 | port = strtol(s, &endp, 0); | |
189 | if (s == endp || *endp != '\0' || | |
190 | (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) || | |
191 | port <= 0 || port > 65535) | |
192 | return 0; | |
193 | ||
194 | return port; | |
195 | } | |
196 | ||
197 | #define SECONDS 1 | |
198 | #define MINUTES (SECONDS * 60) | |
199 | #define HOURS (MINUTES * 60) | |
200 | #define DAYS (HOURS * 24) | |
201 | #define WEEKS (DAYS * 7) | |
202 | ||
203 | /* | |
204 | * Convert a time string into seconds; format is | |
205 | * a sequence of: | |
206 | * time[qualifier] | |
207 | * | |
208 | * Valid time qualifiers are: | |
209 | * <none> seconds | |
210 | * s|S seconds | |
211 | * m|M minutes | |
212 | * h|H hours | |
213 | * d|D days | |
214 | * w|W weeks | |
215 | * | |
216 | * Examples: | |
217 | * 90m 90 minutes | |
218 | * 1h30m 90 minutes | |
219 | * 2d 2 days | |
220 | * 1w 1 week | |
221 | * | |
222 | * Return -1 if time string is invalid. | |
223 | */ | |
224 | long | |
225 | convtime(const char *s) | |
226 | { | |
227 | long total, secs; | |
228 | const char *p; | |
229 | char *endp; | |
230 | ||
231 | errno = 0; | |
232 | total = 0; | |
233 | p = s; | |
234 | ||
235 | if (p == NULL || *p == '\0') | |
236 | return -1; | |
237 | ||
238 | while (*p) { | |
239 | secs = strtol(p, &endp, 10); | |
240 | if (p == endp || | |
241 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || | |
242 | secs < 0) | |
243 | return -1; | |
244 | ||
245 | switch (*endp++) { | |
246 | case '\0': | |
247 | endp--; | |
248 | case 's': | |
249 | case 'S': | |
250 | break; | |
251 | case 'm': | |
252 | case 'M': | |
253 | secs *= MINUTES; | |
254 | break; | |
255 | case 'h': | |
256 | case 'H': | |
257 | secs *= HOURS; | |
258 | break; | |
259 | case 'd': | |
260 | case 'D': | |
261 | secs *= DAYS; | |
262 | break; | |
263 | case 'w': | |
264 | case 'W': | |
265 | secs *= WEEKS; | |
266 | break; | |
267 | default: | |
268 | return -1; | |
269 | } | |
270 | total += secs; | |
271 | if (total < 0) | |
272 | return -1; | |
273 | p = endp; | |
274 | } | |
275 | ||
276 | return total; | |
277 | } | |
278 | ||
996d5e62 | 279 | /* |
280 | * Search for next delimiter between hostnames/addresses and ports. | |
281 | * Argument may be modified (for termination). | |
282 | * Returns *cp if parsing succeeds. | |
283 | * *cp is set to the start of the next delimiter, if one was found. | |
284 | * If this is the last field, *cp is set to NULL. | |
285 | */ | |
286 | char * | |
287 | hpdelim(char **cp) | |
288 | { | |
289 | char *s, *old; | |
290 | ||
291 | if (cp == NULL || *cp == NULL) | |
292 | return NULL; | |
293 | ||
294 | old = s = *cp; | |
295 | if (*s == '[') { | |
296 | if ((s = strchr(s, ']')) == NULL) | |
297 | return NULL; | |
298 | else | |
299 | s++; | |
300 | } else if ((s = strpbrk(s, ":/")) == NULL) | |
301 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ | |
302 | ||
303 | switch (*s) { | |
304 | case '\0': | |
305 | *cp = NULL; /* no more fields*/ | |
306 | break; | |
dec6d9fe | 307 | |
996d5e62 | 308 | case ':': |
309 | case '/': | |
310 | *s = '\0'; /* terminate */ | |
311 | *cp = s + 1; | |
312 | break; | |
dec6d9fe | 313 | |
996d5e62 | 314 | default: |
315 | return NULL; | |
316 | } | |
317 | ||
318 | return old; | |
319 | } | |
320 | ||
3c0ef626 | 321 | char * |
322 | cleanhostname(char *host) | |
323 | { | |
324 | if (*host == '[' && host[strlen(host) - 1] == ']') { | |
325 | host[strlen(host) - 1] = '\0'; | |
326 | return (host + 1); | |
327 | } else | |
328 | return host; | |
329 | } | |
330 | ||
331 | char * | |
332 | colon(char *cp) | |
333 | { | |
334 | int flag = 0; | |
335 | ||
336 | if (*cp == ':') /* Leading colon is part of file name. */ | |
337 | return (0); | |
338 | if (*cp == '[') | |
339 | flag = 1; | |
340 | ||
341 | for (; *cp; ++cp) { | |
342 | if (*cp == '@' && *(cp+1) == '[') | |
343 | flag = 1; | |
344 | if (*cp == ']' && *(cp+1) == ':' && flag) | |
345 | return (cp+1); | |
346 | if (*cp == ':' && !flag) | |
347 | return (cp); | |
348 | if (*cp == '/') | |
349 | return (0); | |
350 | } | |
351 | return (0); | |
352 | } | |
353 | ||
354 | /* function to assist building execv() arguments */ | |
355 | void | |
356 | addargs(arglist *args, char *fmt, ...) | |
357 | { | |
358 | va_list ap; | |
359 | char buf[1024]; | |
c9f39d2c | 360 | u_int nalloc; |
3c0ef626 | 361 | |
362 | va_start(ap, fmt); | |
363 | vsnprintf(buf, sizeof(buf), fmt, ap); | |
364 | va_end(ap); | |
365 | ||
acc3d05e | 366 | nalloc = args->nalloc; |
3c0ef626 | 367 | if (args->list == NULL) { |
acc3d05e | 368 | nalloc = 32; |
3c0ef626 | 369 | args->num = 0; |
acc3d05e | 370 | } else if (args->num+2 >= nalloc) |
371 | nalloc *= 2; | |
3c0ef626 | 372 | |
acc3d05e | 373 | args->list = xrealloc(args->list, nalloc * sizeof(char *)); |
374 | args->nalloc = nalloc; | |
3c0ef626 | 375 | args->list[args->num++] = xstrdup(buf); |
376 | args->list[args->num] = NULL; | |
377 | } | |
996d5e62 | 378 | |
665a873d | 379 | /* |
380 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
381 | * Warning: this calls getpw*. | |
382 | */ | |
383 | char * | |
384 | tilde_expand_filename(const char *filename, uid_t uid) | |
385 | { | |
386 | const char *path; | |
387 | char user[128], ret[MAXPATHLEN]; | |
388 | struct passwd *pw; | |
389 | u_int len, slash; | |
390 | ||
391 | if (*filename != '~') | |
392 | return (xstrdup(filename)); | |
393 | filename++; | |
394 | ||
395 | path = strchr(filename, '/'); | |
396 | if (path != NULL && path > filename) { /* ~user/path */ | |
397 | slash = path - filename; | |
398 | if (slash > sizeof(user) - 1) | |
399 | fatal("tilde_expand_filename: ~username too long"); | |
400 | memcpy(user, filename, slash); | |
401 | user[slash] = '\0'; | |
402 | if ((pw = getpwnam(user)) == NULL) | |
403 | fatal("tilde_expand_filename: No such user %s", user); | |
404 | } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ | |
405 | fatal("tilde_expand_filename: No such uid %d", uid); | |
406 | ||
407 | if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) | |
408 | fatal("tilde_expand_filename: Path too long"); | |
409 | ||
410 | /* Make sure directory has a trailing '/' */ | |
411 | len = strlen(pw->pw_dir); | |
412 | if ((len == 0 || pw->pw_dir[len - 1] != '/') && | |
413 | strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) | |
414 | fatal("tilde_expand_filename: Path too long"); | |
415 | ||
416 | /* Skip leading '/' from specified path */ | |
417 | if (path != NULL) | |
418 | filename = path + 1; | |
419 | if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) | |
420 | fatal("tilde_expand_filename: Path too long"); | |
421 | ||
422 | return (xstrdup(ret)); | |
423 | } | |
424 | ||
425 | /* | |
426 | * Expand a string with a set of %[char] escapes. A number of escapes may be | |
427 | * specified as (char *escape_chars, char *replacement) pairs. The list must | |
428 | * be terminated by a NULL escape_char. Returns replaced string in memory | |
429 | * allocated by xmalloc. | |
430 | */ | |
431 | char * | |
432 | percent_expand(const char *string, ...) | |
433 | { | |
434 | #define EXPAND_MAX_KEYS 16 | |
435 | struct { | |
436 | const char *key; | |
437 | const char *repl; | |
438 | } keys[EXPAND_MAX_KEYS]; | |
439 | u_int num_keys, i, j; | |
440 | char buf[4096]; | |
441 | va_list ap; | |
442 | ||
443 | /* Gather keys */ | |
444 | va_start(ap, string); | |
445 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { | |
446 | keys[num_keys].key = va_arg(ap, char *); | |
447 | if (keys[num_keys].key == NULL) | |
448 | break; | |
449 | keys[num_keys].repl = va_arg(ap, char *); | |
450 | if (keys[num_keys].repl == NULL) | |
451 | fatal("percent_expand: NULL replacement"); | |
452 | } | |
453 | va_end(ap); | |
454 | ||
455 | if (num_keys >= EXPAND_MAX_KEYS) | |
456 | fatal("percent_expand: too many keys"); | |
457 | ||
458 | /* Expand string */ | |
459 | *buf = '\0'; | |
460 | for (i = 0; *string != '\0'; string++) { | |
461 | if (*string != '%') { | |
462 | append: | |
463 | buf[i++] = *string; | |
464 | if (i >= sizeof(buf)) | |
465 | fatal("percent_expand: string too long"); | |
466 | buf[i] = '\0'; | |
467 | continue; | |
468 | } | |
469 | string++; | |
470 | if (*string == '%') | |
471 | goto append; | |
472 | for (j = 0; j < num_keys; j++) { | |
473 | if (strchr(keys[j].key, *string) != NULL) { | |
474 | i = strlcat(buf, keys[j].repl, sizeof(buf)); | |
475 | if (i >= sizeof(buf)) | |
476 | fatal("percent_expand: string too long"); | |
477 | break; | |
478 | } | |
479 | } | |
480 | if (j >= num_keys) | |
481 | fatal("percent_expand: unknown key %%%c", *string); | |
482 | } | |
483 | return (xstrdup(buf)); | |
484 | #undef EXPAND_MAX_KEYS | |
485 | } | |
486 | ||
996d5e62 | 487 | /* |
488 | * Read an entire line from a public key file into a static buffer, discarding | |
489 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. | |
490 | */ | |
491 | int | |
492 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, | |
493 | u_long *lineno) | |
494 | { | |
495 | while (fgets(buf, bufsz, f) != NULL) { | |
496 | (*lineno)++; | |
497 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { | |
498 | return 0; | |
499 | } else { | |
500 | debug("%s: %s line %lu exceeds size limit", __func__, | |
501 | filename, *lineno); | |
502 | /* discard remainder of line */ | |
dec6d9fe | 503 | while (fgetc(f) != '\n' && !feof(f)) |
996d5e62 | 504 | ; /* nothing */ |
505 | } | |
506 | } | |
507 | return -1; | |
508 | } | |
665a873d | 509 | |
510 | char * | |
511 | tohex(const u_char *d, u_int l) | |
512 | { | |
513 | char b[3], *r; | |
514 | u_int i, hl; | |
515 | ||
516 | hl = l * 2 + 1; | |
517 | r = xmalloc(hl); | |
518 | *r = '\0'; | |
519 | for (i = 0; i < l; i++) { | |
520 | snprintf(b, sizeof(b), "%02x", d[i]); | |
521 | strlcat(r, b, hl); | |
522 | } | |
523 | return (r); | |
524 | } | |
525 |