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2e437378 | 1 | /* $OpenBSD: misc.c,v 1.64 2006/08/03 03:34:42 deraadt Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
2e437378 | 4 | * Copyright (c) 2005,2006 Damien Miller. All rights reserved. |
3c0ef626 | 5 | * |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
e00da40d | 28 | |
2e437378 | 29 | #include <sys/types.h> |
30 | #include <sys/ioctl.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/param.h> | |
33 | ||
34 | #include <stdarg.h> | |
35 | #include <stdio.h> | |
36 | #include <stdlib.h> | |
37 | #include <string.h> | |
38 | #include <unistd.h> | |
39 | ||
40 | #include <netinet/in.h> | |
41 | #include <netinet/tcp.h> | |
42 | ||
43 | #include <errno.h> | |
44 | #include <fcntl.h> | |
45 | #ifdef HAVE_PATHS_H | |
46 | # include <paths.h> | |
47 | #include <pwd.h> | |
48 | #endif | |
e00da40d | 49 | #ifdef SSH_TUN_OPENBSD |
50 | #include <net/if.h> | |
51 | #endif | |
3c0ef626 | 52 | |
2e437378 | 53 | #include "xmalloc.h" |
3c0ef626 | 54 | #include "misc.h" |
55 | #include "log.h" | |
2e437378 | 56 | #include "ssh.h" |
3c0ef626 | 57 | |
58 | /* remove newline at end of string */ | |
59 | char * | |
60 | chop(char *s) | |
61 | { | |
62 | char *t = s; | |
63 | while (*t) { | |
e9a17296 | 64 | if (*t == '\n' || *t == '\r') { |
3c0ef626 | 65 | *t = '\0'; |
66 | return s; | |
67 | } | |
68 | t++; | |
69 | } | |
70 | return s; | |
71 | ||
72 | } | |
73 | ||
74 | /* set/unset filedescriptor to non-blocking */ | |
1b56ff3d | 75 | int |
3c0ef626 | 76 | set_nonblock(int fd) |
77 | { | |
78 | int val; | |
79 | ||
80 | val = fcntl(fd, F_GETFL, 0); | |
81 | if (val < 0) { | |
82 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
1b56ff3d | 83 | return (-1); |
3c0ef626 | 84 | } |
85 | if (val & O_NONBLOCK) { | |
1b56ff3d | 86 | debug3("fd %d is O_NONBLOCK", fd); |
87 | return (0); | |
3c0ef626 | 88 | } |
70791e56 | 89 | debug2("fd %d setting O_NONBLOCK", fd); |
3c0ef626 | 90 | val |= O_NONBLOCK; |
1b56ff3d | 91 | if (fcntl(fd, F_SETFL, val) == -1) { |
92 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, | |
93 | strerror(errno)); | |
94 | return (-1); | |
95 | } | |
96 | return (0); | |
3c0ef626 | 97 | } |
98 | ||
1b56ff3d | 99 | int |
3c0ef626 | 100 | unset_nonblock(int fd) |
101 | { | |
102 | int val; | |
103 | ||
104 | val = fcntl(fd, F_GETFL, 0); | |
105 | if (val < 0) { | |
106 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
1b56ff3d | 107 | return (-1); |
3c0ef626 | 108 | } |
109 | if (!(val & O_NONBLOCK)) { | |
1b56ff3d | 110 | debug3("fd %d is not O_NONBLOCK", fd); |
111 | return (0); | |
3c0ef626 | 112 | } |
113 | debug("fd %d clearing O_NONBLOCK", fd); | |
114 | val &= ~O_NONBLOCK; | |
1b56ff3d | 115 | if (fcntl(fd, F_SETFL, val) == -1) { |
116 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", | |
e9a17296 | 117 | fd, strerror(errno)); |
1b56ff3d | 118 | return (-1); |
119 | } | |
120 | return (0); | |
e9a17296 | 121 | } |
122 | ||
123 | /* disable nagle on socket */ | |
124 | void | |
125 | set_nodelay(int fd) | |
126 | { | |
127 | int opt; | |
128 | socklen_t optlen; | |
129 | ||
130 | optlen = sizeof opt; | |
131 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { | |
416fd2a8 | 132 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
e9a17296 | 133 | return; |
134 | } | |
135 | if (opt == 1) { | |
136 | debug2("fd %d is TCP_NODELAY", fd); | |
137 | return; | |
138 | } | |
139 | opt = 1; | |
1c14df9e | 140 | debug2("fd %d setting TCP_NODELAY", fd); |
e9a17296 | 141 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) |
142 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); | |
3c0ef626 | 143 | } |
144 | ||
145 | /* Characters considered whitespace in strsep calls. */ | |
146 | #define WHITESPACE " \t\r\n" | |
2e437378 | 147 | #define QUOTE "\"" |
3c0ef626 | 148 | |
88928908 | 149 | /* Characters considered as quotations. */ |
150 | #define QUOTES "'\"" | |
151 | ||
3c0ef626 | 152 | /* return next token in configuration line */ |
153 | char * | |
154 | strdelim(char **s) | |
155 | { | |
88928908 | 156 | char *old, *p, *q; |
3c0ef626 | 157 | int wspace = 0; |
158 | ||
159 | if (*s == NULL) | |
160 | return NULL; | |
161 | ||
162 | old = *s; | |
163 | ||
88928908 | 164 | if ((q=strchr(QUOTES, (int) *old)) && *q) |
165 | { | |
166 | /* find next quote character, point old to start of quoted | |
167 | * string */ | |
168 | for (p = ++old;*p && *p!=*q; p++) | |
169 | ; | |
170 | ||
171 | /* find start of next token */ | |
172 | *s = (*p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL; | |
173 | ||
174 | /* terminate 'old' token */ | |
175 | *p = '\0'; | |
176 | return (old); | |
177 | } | |
178 | ||
2e437378 | 179 | *s = strpbrk(*s, WHITESPACE QUOTE "="); |
3c0ef626 | 180 | if (*s == NULL) |
181 | return (old); | |
182 | ||
2e437378 | 183 | if (*s[0] == '\"') { |
184 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ | |
185 | /* Find matching quote */ | |
186 | if ((*s = strpbrk(*s, QUOTE)) == NULL) { | |
187 | return (NULL); /* no matching quote */ | |
188 | } else { | |
189 | *s[0] = '\0'; | |
190 | return (old); | |
191 | } | |
192 | } | |
193 | ||
3c0ef626 | 194 | /* Allow only one '=' to be skipped */ |
195 | if (*s[0] == '=') | |
196 | wspace = 1; | |
197 | *s[0] = '\0'; | |
198 | ||
2e437378 | 199 | /* Skip any extra whitespace after first token */ |
3c0ef626 | 200 | *s += strspn(*s + 1, WHITESPACE) + 1; |
201 | if (*s[0] == '=' && !wspace) | |
202 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
203 | ||
204 | return (old); | |
205 | } | |
206 | ||
207 | struct passwd * | |
208 | pwcopy(struct passwd *pw) | |
209 | { | |
2e437378 | 210 | struct passwd *copy = xcalloc(1, sizeof(*copy)); |
3c0ef626 | 211 | |
3c0ef626 | 212 | copy->pw_name = xstrdup(pw->pw_name); |
213 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
214 | copy->pw_gecos = xstrdup(pw->pw_gecos); | |
215 | copy->pw_uid = pw->pw_uid; | |
216 | copy->pw_gid = pw->pw_gid; | |
217 | #ifdef HAVE_PW_EXPIRE_IN_PASSWD | |
218 | copy->pw_expire = pw->pw_expire; | |
219 | #endif | |
220 | #ifdef HAVE_PW_CHANGE_IN_PASSWD | |
221 | copy->pw_change = pw->pw_change; | |
222 | #endif | |
223 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
224 | copy->pw_class = xstrdup(pw->pw_class); | |
225 | #endif | |
226 | copy->pw_dir = xstrdup(pw->pw_dir); | |
227 | copy->pw_shell = xstrdup(pw->pw_shell); | |
228 | return copy; | |
229 | } | |
230 | ||
231 | /* | |
232 | * Convert ASCII string to TCP/IP port number. | |
233 | * Port must be >0 and <=65535. | |
234 | * Return 0 if invalid. | |
235 | */ | |
236 | int | |
237 | a2port(const char *s) | |
238 | { | |
239 | long port; | |
240 | char *endp; | |
241 | ||
242 | errno = 0; | |
243 | port = strtol(s, &endp, 0); | |
244 | if (s == endp || *endp != '\0' || | |
245 | (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) || | |
246 | port <= 0 || port > 65535) | |
247 | return 0; | |
248 | ||
249 | return port; | |
250 | } | |
251 | ||
e00da40d | 252 | int |
253 | a2tun(const char *s, int *remote) | |
254 | { | |
255 | const char *errstr = NULL; | |
256 | char *sp, *ep; | |
257 | int tun; | |
258 | ||
259 | if (remote != NULL) { | |
260 | *remote = SSH_TUNID_ANY; | |
261 | sp = xstrdup(s); | |
262 | if ((ep = strchr(sp, ':')) == NULL) { | |
263 | xfree(sp); | |
264 | return (a2tun(s, NULL)); | |
265 | } | |
266 | ep[0] = '\0'; ep++; | |
267 | *remote = a2tun(ep, NULL); | |
268 | tun = a2tun(sp, NULL); | |
269 | xfree(sp); | |
270 | return (*remote == SSH_TUNID_ERR ? *remote : tun); | |
271 | } | |
272 | ||
273 | if (strcasecmp(s, "any") == 0) | |
274 | return (SSH_TUNID_ANY); | |
275 | ||
276 | tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); | |
277 | if (errstr != NULL) | |
278 | return (SSH_TUNID_ERR); | |
279 | ||
280 | return (tun); | |
281 | } | |
282 | ||
3c0ef626 | 283 | #define SECONDS 1 |
284 | #define MINUTES (SECONDS * 60) | |
285 | #define HOURS (MINUTES * 60) | |
286 | #define DAYS (HOURS * 24) | |
287 | #define WEEKS (DAYS * 7) | |
288 | ||
289 | /* | |
290 | * Convert a time string into seconds; format is | |
291 | * a sequence of: | |
292 | * time[qualifier] | |
293 | * | |
294 | * Valid time qualifiers are: | |
295 | * <none> seconds | |
296 | * s|S seconds | |
297 | * m|M minutes | |
298 | * h|H hours | |
299 | * d|D days | |
300 | * w|W weeks | |
301 | * | |
302 | * Examples: | |
303 | * 90m 90 minutes | |
304 | * 1h30m 90 minutes | |
305 | * 2d 2 days | |
306 | * 1w 1 week | |
307 | * | |
308 | * Return -1 if time string is invalid. | |
309 | */ | |
310 | long | |
311 | convtime(const char *s) | |
312 | { | |
313 | long total, secs; | |
314 | const char *p; | |
315 | char *endp; | |
316 | ||
317 | errno = 0; | |
318 | total = 0; | |
319 | p = s; | |
320 | ||
321 | if (p == NULL || *p == '\0') | |
322 | return -1; | |
323 | ||
324 | while (*p) { | |
325 | secs = strtol(p, &endp, 10); | |
326 | if (p == endp || | |
327 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || | |
328 | secs < 0) | |
329 | return -1; | |
330 | ||
331 | switch (*endp++) { | |
332 | case '\0': | |
333 | endp--; | |
2e437378 | 334 | break; |
3c0ef626 | 335 | case 's': |
336 | case 'S': | |
337 | break; | |
338 | case 'm': | |
339 | case 'M': | |
340 | secs *= MINUTES; | |
341 | break; | |
342 | case 'h': | |
343 | case 'H': | |
344 | secs *= HOURS; | |
345 | break; | |
346 | case 'd': | |
347 | case 'D': | |
348 | secs *= DAYS; | |
349 | break; | |
350 | case 'w': | |
351 | case 'W': | |
352 | secs *= WEEKS; | |
353 | break; | |
354 | default: | |
355 | return -1; | |
356 | } | |
357 | total += secs; | |
358 | if (total < 0) | |
359 | return -1; | |
360 | p = endp; | |
361 | } | |
362 | ||
363 | return total; | |
364 | } | |
365 | ||
2e437378 | 366 | /* |
367 | * Returns a standardized host+port identifier string. | |
368 | * Caller must free returned string. | |
369 | */ | |
370 | char * | |
371 | put_host_port(const char *host, u_short port) | |
372 | { | |
373 | char *hoststr; | |
374 | ||
375 | if (port == 0 || port == SSH_DEFAULT_PORT) | |
376 | return(xstrdup(host)); | |
377 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) | |
378 | fatal("put_host_port: asprintf: %s", strerror(errno)); | |
379 | debug3("put_host_port: %s", hoststr); | |
380 | return hoststr; | |
381 | } | |
382 | ||
34fee935 | 383 | /* |
384 | * Search for next delimiter between hostnames/addresses and ports. | |
385 | * Argument may be modified (for termination). | |
386 | * Returns *cp if parsing succeeds. | |
387 | * *cp is set to the start of the next delimiter, if one was found. | |
388 | * If this is the last field, *cp is set to NULL. | |
389 | */ | |
390 | char * | |
391 | hpdelim(char **cp) | |
392 | { | |
393 | char *s, *old; | |
394 | ||
395 | if (cp == NULL || *cp == NULL) | |
396 | return NULL; | |
397 | ||
398 | old = s = *cp; | |
399 | if (*s == '[') { | |
400 | if ((s = strchr(s, ']')) == NULL) | |
401 | return NULL; | |
402 | else | |
403 | s++; | |
404 | } else if ((s = strpbrk(s, ":/")) == NULL) | |
405 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ | |
406 | ||
407 | switch (*s) { | |
408 | case '\0': | |
409 | *cp = NULL; /* no more fields*/ | |
410 | break; | |
411 | ||
412 | case ':': | |
413 | case '/': | |
414 | *s = '\0'; /* terminate */ | |
415 | *cp = s + 1; | |
416 | break; | |
417 | ||
418 | default: | |
419 | return NULL; | |
420 | } | |
421 | ||
422 | return old; | |
423 | } | |
424 | ||
3c0ef626 | 425 | char * |
426 | cleanhostname(char *host) | |
427 | { | |
428 | if (*host == '[' && host[strlen(host) - 1] == ']') { | |
429 | host[strlen(host) - 1] = '\0'; | |
430 | return (host + 1); | |
431 | } else | |
432 | return host; | |
433 | } | |
434 | ||
435 | char * | |
436 | colon(char *cp) | |
437 | { | |
438 | int flag = 0; | |
439 | ||
440 | if (*cp == ':') /* Leading colon is part of file name. */ | |
441 | return (0); | |
442 | if (*cp == '[') | |
443 | flag = 1; | |
444 | ||
445 | for (; *cp; ++cp) { | |
446 | if (*cp == '@' && *(cp+1) == '[') | |
447 | flag = 1; | |
448 | if (*cp == ']' && *(cp+1) == ':' && flag) | |
449 | return (cp+1); | |
450 | if (*cp == ':' && !flag) | |
451 | return (cp); | |
452 | if (*cp == '/') | |
453 | return (0); | |
454 | } | |
455 | return (0); | |
456 | } | |
457 | ||
458 | /* function to assist building execv() arguments */ | |
459 | void | |
460 | addargs(arglist *args, char *fmt, ...) | |
461 | { | |
462 | va_list ap; | |
e00da40d | 463 | char *cp; |
1b56ff3d | 464 | u_int nalloc; |
e00da40d | 465 | int r; |
3c0ef626 | 466 | |
467 | va_start(ap, fmt); | |
e00da40d | 468 | r = vasprintf(&cp, fmt, ap); |
3c0ef626 | 469 | va_end(ap); |
e00da40d | 470 | if (r == -1) |
471 | fatal("addargs: argument too long"); | |
3c0ef626 | 472 | |
70791e56 | 473 | nalloc = args->nalloc; |
3c0ef626 | 474 | if (args->list == NULL) { |
70791e56 | 475 | nalloc = 32; |
3c0ef626 | 476 | args->num = 0; |
70791e56 | 477 | } else if (args->num+2 >= nalloc) |
478 | nalloc *= 2; | |
3c0ef626 | 479 | |
2e437378 | 480 | args->list = xrealloc(args->list, nalloc, sizeof(char *)); |
70791e56 | 481 | args->nalloc = nalloc; |
e00da40d | 482 | args->list[args->num++] = cp; |
3c0ef626 | 483 | args->list[args->num] = NULL; |
484 | } | |
34fee935 | 485 | |
e00da40d | 486 | void |
487 | replacearg(arglist *args, u_int which, char *fmt, ...) | |
488 | { | |
489 | va_list ap; | |
490 | char *cp; | |
491 | int r; | |
492 | ||
493 | va_start(ap, fmt); | |
494 | r = vasprintf(&cp, fmt, ap); | |
495 | va_end(ap); | |
496 | if (r == -1) | |
497 | fatal("replacearg: argument too long"); | |
498 | ||
499 | if (which >= args->num) | |
500 | fatal("replacearg: tried to replace invalid arg %d >= %d", | |
501 | which, args->num); | |
502 | xfree(args->list[which]); | |
503 | args->list[which] = cp; | |
504 | } | |
505 | ||
506 | void | |
507 | freeargs(arglist *args) | |
508 | { | |
509 | u_int i; | |
510 | ||
511 | if (args->list != NULL) { | |
512 | for (i = 0; i < args->num; i++) | |
513 | xfree(args->list[i]); | |
514 | xfree(args->list); | |
515 | args->nalloc = args->num = 0; | |
516 | args->list = NULL; | |
517 | } | |
518 | } | |
519 | ||
34fee935 | 520 | /* |
521 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
522 | * Warning: this calls getpw*. | |
523 | */ | |
524 | char * | |
525 | tilde_expand_filename(const char *filename, uid_t uid) | |
526 | { | |
527 | const char *path; | |
528 | char user[128], ret[MAXPATHLEN]; | |
529 | struct passwd *pw; | |
530 | u_int len, slash; | |
531 | ||
532 | if (*filename != '~') | |
533 | return (xstrdup(filename)); | |
534 | filename++; | |
535 | ||
536 | path = strchr(filename, '/'); | |
537 | if (path != NULL && path > filename) { /* ~user/path */ | |
538 | slash = path - filename; | |
539 | if (slash > sizeof(user) - 1) | |
540 | fatal("tilde_expand_filename: ~username too long"); | |
541 | memcpy(user, filename, slash); | |
542 | user[slash] = '\0'; | |
543 | if ((pw = getpwnam(user)) == NULL) | |
544 | fatal("tilde_expand_filename: No such user %s", user); | |
545 | } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ | |
546 | fatal("tilde_expand_filename: No such uid %d", uid); | |
547 | ||
548 | if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) | |
549 | fatal("tilde_expand_filename: Path too long"); | |
550 | ||
551 | /* Make sure directory has a trailing '/' */ | |
552 | len = strlen(pw->pw_dir); | |
553 | if ((len == 0 || pw->pw_dir[len - 1] != '/') && | |
554 | strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) | |
555 | fatal("tilde_expand_filename: Path too long"); | |
556 | ||
557 | /* Skip leading '/' from specified path */ | |
558 | if (path != NULL) | |
559 | filename = path + 1; | |
560 | if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) | |
561 | fatal("tilde_expand_filename: Path too long"); | |
562 | ||
563 | return (xstrdup(ret)); | |
564 | } | |
565 | ||
566 | /* | |
567 | * Expand a string with a set of %[char] escapes. A number of escapes may be | |
568 | * specified as (char *escape_chars, char *replacement) pairs. The list must | |
569 | * be terminated by a NULL escape_char. Returns replaced string in memory | |
570 | * allocated by xmalloc. | |
571 | */ | |
572 | char * | |
573 | percent_expand(const char *string, ...) | |
574 | { | |
575 | #define EXPAND_MAX_KEYS 16 | |
576 | struct { | |
577 | const char *key; | |
578 | const char *repl; | |
579 | } keys[EXPAND_MAX_KEYS]; | |
580 | u_int num_keys, i, j; | |
581 | char buf[4096]; | |
582 | va_list ap; | |
583 | ||
584 | /* Gather keys */ | |
585 | va_start(ap, string); | |
586 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { | |
587 | keys[num_keys].key = va_arg(ap, char *); | |
588 | if (keys[num_keys].key == NULL) | |
589 | break; | |
590 | keys[num_keys].repl = va_arg(ap, char *); | |
591 | if (keys[num_keys].repl == NULL) | |
592 | fatal("percent_expand: NULL replacement"); | |
593 | } | |
594 | va_end(ap); | |
595 | ||
596 | if (num_keys >= EXPAND_MAX_KEYS) | |
597 | fatal("percent_expand: too many keys"); | |
598 | ||
599 | /* Expand string */ | |
600 | *buf = '\0'; | |
601 | for (i = 0; *string != '\0'; string++) { | |
602 | if (*string != '%') { | |
603 | append: | |
604 | buf[i++] = *string; | |
605 | if (i >= sizeof(buf)) | |
606 | fatal("percent_expand: string too long"); | |
607 | buf[i] = '\0'; | |
608 | continue; | |
609 | } | |
610 | string++; | |
611 | if (*string == '%') | |
612 | goto append; | |
613 | for (j = 0; j < num_keys; j++) { | |
614 | if (strchr(keys[j].key, *string) != NULL) { | |
615 | i = strlcat(buf, keys[j].repl, sizeof(buf)); | |
616 | if (i >= sizeof(buf)) | |
617 | fatal("percent_expand: string too long"); | |
618 | break; | |
619 | } | |
620 | } | |
621 | if (j >= num_keys) | |
622 | fatal("percent_expand: unknown key %%%c", *string); | |
623 | } | |
624 | return (xstrdup(buf)); | |
625 | #undef EXPAND_MAX_KEYS | |
626 | } | |
627 | ||
628 | /* | |
629 | * Read an entire line from a public key file into a static buffer, discarding | |
630 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. | |
631 | */ | |
632 | int | |
633 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, | |
634 | u_long *lineno) | |
635 | { | |
636 | while (fgets(buf, bufsz, f) != NULL) { | |
637 | (*lineno)++; | |
638 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { | |
639 | return 0; | |
640 | } else { | |
641 | debug("%s: %s line %lu exceeds size limit", __func__, | |
642 | filename, *lineno); | |
643 | /* discard remainder of line */ | |
644 | while (fgetc(f) != '\n' && !feof(f)) | |
645 | ; /* nothing */ | |
646 | } | |
647 | } | |
648 | return -1; | |
649 | } | |
650 | ||
e00da40d | 651 | int |
652 | tun_open(int tun, int mode) | |
653 | { | |
654 | #if defined(CUSTOM_SYS_TUN_OPEN) | |
655 | return (sys_tun_open(tun, mode)); | |
656 | #elif defined(SSH_TUN_OPENBSD) | |
657 | struct ifreq ifr; | |
658 | char name[100]; | |
659 | int fd = -1, sock; | |
660 | ||
661 | /* Open the tunnel device */ | |
662 | if (tun <= SSH_TUNID_MAX) { | |
663 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
664 | fd = open(name, O_RDWR); | |
665 | } else if (tun == SSH_TUNID_ANY) { | |
666 | for (tun = 100; tun >= 0; tun--) { | |
667 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
668 | if ((fd = open(name, O_RDWR)) >= 0) | |
669 | break; | |
670 | } | |
671 | } else { | |
672 | debug("%s: invalid tunnel %u", __func__, tun); | |
673 | return (-1); | |
674 | } | |
675 | ||
676 | if (fd < 0) { | |
677 | debug("%s: %s open failed: %s", __func__, name, strerror(errno)); | |
678 | return (-1); | |
679 | } | |
680 | ||
681 | debug("%s: %s mode %d fd %d", __func__, name, mode, fd); | |
682 | ||
683 | /* Set the tunnel device operation mode */ | |
684 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); | |
685 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) | |
686 | goto failed; | |
687 | ||
688 | if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) | |
689 | goto failed; | |
690 | ||
691 | /* Set interface mode */ | |
692 | ifr.ifr_flags &= ~IFF_UP; | |
693 | if (mode == SSH_TUNMODE_ETHERNET) | |
694 | ifr.ifr_flags |= IFF_LINK0; | |
695 | else | |
696 | ifr.ifr_flags &= ~IFF_LINK0; | |
697 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
698 | goto failed; | |
699 | ||
700 | /* Bring interface up */ | |
701 | ifr.ifr_flags |= IFF_UP; | |
702 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
703 | goto failed; | |
704 | ||
705 | close(sock); | |
706 | return (fd); | |
707 | ||
708 | failed: | |
709 | if (fd >= 0) | |
710 | close(fd); | |
711 | if (sock >= 0) | |
712 | close(sock); | |
713 | debug("%s: failed to set %s mode %d: %s", __func__, name, | |
714 | mode, strerror(errno)); | |
715 | return (-1); | |
716 | #else | |
717 | error("Tunnel interfaces are not supported on this platform"); | |
718 | return (-1); | |
719 | #endif | |
720 | } | |
721 | ||
722 | void | |
723 | sanitise_stdfd(void) | |
724 | { | |
725 | int nullfd, dupfd; | |
726 | ||
727 | if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { | |
728 | fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno)); | |
729 | exit(1); | |
730 | } | |
731 | while (++dupfd <= 2) { | |
732 | /* Only clobber closed fds */ | |
733 | if (fcntl(dupfd, F_GETFL, 0) >= 0) | |
734 | continue; | |
735 | if (dup2(nullfd, dupfd) == -1) { | |
736 | fprintf(stderr, "dup2: %s", strerror(errno)); | |
737 | exit(1); | |
738 | } | |
739 | } | |
740 | if (nullfd > 2) | |
741 | close(nullfd); | |
742 | } | |
743 | ||
34fee935 | 744 | char * |
2e437378 | 745 | tohex(const void *vp, size_t l) |
34fee935 | 746 | { |
2e437378 | 747 | const u_char *p = (const u_char *)vp; |
34fee935 | 748 | char b[3], *r; |
2e437378 | 749 | size_t i, hl; |
750 | ||
751 | if (l > 65536) | |
752 | return xstrdup("tohex: length > 65536"); | |
34fee935 | 753 | |
754 | hl = l * 2 + 1; | |
2e437378 | 755 | r = xcalloc(1, hl); |
34fee935 | 756 | for (i = 0; i < l; i++) { |
2e437378 | 757 | snprintf(b, sizeof(b), "%02x", p[i]); |
34fee935 | 758 | strlcat(r, b, hl); |
759 | } | |
760 | return (r); | |
761 | } | |
762 | ||
2e437378 | 763 | u_int64_t |
764 | get_u64(const void *vp) | |
765 | { | |
766 | const u_char *p = (const u_char *)vp; | |
767 | u_int64_t v; | |
768 | ||
769 | v = (u_int64_t)p[0] << 56; | |
770 | v |= (u_int64_t)p[1] << 48; | |
771 | v |= (u_int64_t)p[2] << 40; | |
772 | v |= (u_int64_t)p[3] << 32; | |
773 | v |= (u_int64_t)p[4] << 24; | |
774 | v |= (u_int64_t)p[5] << 16; | |
775 | v |= (u_int64_t)p[6] << 8; | |
776 | v |= (u_int64_t)p[7]; | |
777 | ||
778 | return (v); | |
779 | } | |
780 | ||
781 | u_int32_t | |
782 | get_u32(const void *vp) | |
783 | { | |
784 | const u_char *p = (const u_char *)vp; | |
785 | u_int32_t v; | |
786 | ||
787 | v = (u_int32_t)p[0] << 24; | |
788 | v |= (u_int32_t)p[1] << 16; | |
789 | v |= (u_int32_t)p[2] << 8; | |
790 | v |= (u_int32_t)p[3]; | |
791 | ||
792 | return (v); | |
793 | } | |
794 | ||
795 | u_int16_t | |
796 | get_u16(const void *vp) | |
797 | { | |
798 | const u_char *p = (const u_char *)vp; | |
799 | u_int16_t v; | |
800 | ||
801 | v = (u_int16_t)p[0] << 8; | |
802 | v |= (u_int16_t)p[1]; | |
803 | ||
804 | return (v); | |
805 | } | |
806 | ||
807 | void | |
808 | put_u64(void *vp, u_int64_t v) | |
809 | { | |
810 | u_char *p = (u_char *)vp; | |
811 | ||
812 | p[0] = (u_char)(v >> 56) & 0xff; | |
813 | p[1] = (u_char)(v >> 48) & 0xff; | |
814 | p[2] = (u_char)(v >> 40) & 0xff; | |
815 | p[3] = (u_char)(v >> 32) & 0xff; | |
816 | p[4] = (u_char)(v >> 24) & 0xff; | |
817 | p[5] = (u_char)(v >> 16) & 0xff; | |
818 | p[6] = (u_char)(v >> 8) & 0xff; | |
819 | p[7] = (u_char)v & 0xff; | |
820 | } | |
821 | ||
822 | void | |
823 | put_u32(void *vp, u_int32_t v) | |
824 | { | |
825 | u_char *p = (u_char *)vp; | |
826 | ||
827 | p[0] = (u_char)(v >> 24) & 0xff; | |
828 | p[1] = (u_char)(v >> 16) & 0xff; | |
829 | p[2] = (u_char)(v >> 8) & 0xff; | |
830 | p[3] = (u_char)v & 0xff; | |
831 | } | |
832 | ||
833 | ||
834 | void | |
835 | put_u16(void *vp, u_int16_t v) | |
836 | { | |
837 | u_char *p = (u_char *)vp; | |
838 | ||
839 | p[0] = (u_char)(v >> 8) & 0xff; | |
840 | p[1] = (u_char)v & 0xff; | |
841 | } |