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3c0ef626 | 1 | /* |
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
2ce0bfe4 | 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" | |
08822d99 | 27 | RCSID("$OpenBSD: misc.c,v 1.42 2006/01/31 10:19:02 djm Exp $"); |
28 | ||
29 | #ifdef SSH_TUN_OPENBSD | |
30 | #include <net/if.h> | |
31 | #endif | |
3c0ef626 | 32 | |
33 | #include "misc.h" | |
34 | #include "log.h" | |
35 | #include "xmalloc.h" | |
36 | ||
37 | /* remove newline at end of string */ | |
38 | char * | |
39 | chop(char *s) | |
40 | { | |
41 | char *t = s; | |
42 | while (*t) { | |
75be3237 | 43 | if (*t == '\n' || *t == '\r') { |
3c0ef626 | 44 | *t = '\0'; |
45 | return s; | |
46 | } | |
47 | t++; | |
48 | } | |
49 | return s; | |
50 | ||
51 | } | |
52 | ||
53 | /* set/unset filedescriptor to non-blocking */ | |
7e82606e | 54 | int |
3c0ef626 | 55 | set_nonblock(int fd) |
56 | { | |
57 | int val; | |
58 | ||
59 | val = fcntl(fd, F_GETFL, 0); | |
60 | if (val < 0) { | |
61 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
7e82606e | 62 | return (-1); |
3c0ef626 | 63 | } |
64 | if (val & O_NONBLOCK) { | |
7e82606e | 65 | debug3("fd %d is O_NONBLOCK", fd); |
66 | return (0); | |
3c0ef626 | 67 | } |
7cac2b65 | 68 | debug2("fd %d setting O_NONBLOCK", fd); |
3c0ef626 | 69 | val |= O_NONBLOCK; |
7e82606e | 70 | if (fcntl(fd, F_SETFL, val) == -1) { |
71 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, | |
72 | strerror(errno)); | |
73 | return (-1); | |
74 | } | |
75 | return (0); | |
3c0ef626 | 76 | } |
77 | ||
7e82606e | 78 | int |
3c0ef626 | 79 | unset_nonblock(int fd) |
80 | { | |
81 | int val; | |
82 | ||
83 | val = fcntl(fd, F_GETFL, 0); | |
84 | if (val < 0) { | |
85 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
7e82606e | 86 | return (-1); |
3c0ef626 | 87 | } |
88 | if (!(val & O_NONBLOCK)) { | |
7e82606e | 89 | debug3("fd %d is not O_NONBLOCK", fd); |
90 | return (0); | |
3c0ef626 | 91 | } |
92 | debug("fd %d clearing O_NONBLOCK", fd); | |
93 | val &= ~O_NONBLOCK; | |
7e82606e | 94 | if (fcntl(fd, F_SETFL, val) == -1) { |
95 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", | |
75be3237 | 96 | fd, strerror(errno)); |
7e82606e | 97 | return (-1); |
98 | } | |
99 | return (0); | |
75be3237 | 100 | } |
101 | ||
102 | /* disable nagle on socket */ | |
103 | void | |
104 | set_nodelay(int fd) | |
105 | { | |
106 | int opt; | |
107 | socklen_t optlen; | |
108 | ||
109 | optlen = sizeof opt; | |
110 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { | |
540d72c3 | 111 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
75be3237 | 112 | return; |
113 | } | |
114 | if (opt == 1) { | |
115 | debug2("fd %d is TCP_NODELAY", fd); | |
116 | return; | |
117 | } | |
118 | opt = 1; | |
119 | debug2("fd %d setting TCP_NODELAY", fd); | |
120 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) | |
121 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); | |
3c0ef626 | 122 | } |
123 | ||
124 | /* Characters considered whitespace in strsep calls. */ | |
125 | #define WHITESPACE " \t\r\n" | |
126 | ||
75be3237 | 127 | /* Characters considered as quotations. */ |
128 | #define QUOTES "'\"" | |
129 | ||
3c0ef626 | 130 | /* return next token in configuration line */ |
131 | char * | |
132 | strdelim(char **s) | |
133 | { | |
75be3237 | 134 | char *old, *p, *q; |
3c0ef626 | 135 | int wspace = 0; |
136 | ||
137 | if (*s == NULL) | |
138 | return NULL; | |
139 | ||
140 | old = *s; | |
141 | ||
75be3237 | 142 | if ((q=strchr(QUOTES, (int) *old)) && *q) |
143 | { | |
144 | /* find next quote character, point old to start of quoted | |
145 | * string */ | |
146 | for (p = ++old;*p && *p!=*q; p++) | |
147 | ; | |
148 | ||
149 | /* find start of next token */ | |
150 | *s = (*p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL; | |
151 | ||
152 | /* terminate 'old' token */ | |
153 | *p = '\0'; | |
154 | return (old); | |
155 | } | |
156 | ||
157 | *s = strpbrk(*s, WHITESPACE "="); | |
3c0ef626 | 158 | if (*s == NULL) |
159 | return (old); | |
160 | ||
161 | /* Allow only one '=' to be skipped */ | |
162 | if (*s[0] == '=') | |
163 | wspace = 1; | |
164 | *s[0] = '\0'; | |
165 | ||
166 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
167 | if (*s[0] == '=' && !wspace) | |
168 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
169 | ||
170 | return (old); | |
171 | } | |
172 | ||
173 | struct passwd * | |
174 | pwcopy(struct passwd *pw) | |
175 | { | |
176 | struct passwd *copy = xmalloc(sizeof(*copy)); | |
177 | ||
178 | memset(copy, 0, sizeof(*copy)); | |
179 | copy->pw_name = xstrdup(pw->pw_name); | |
180 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
181 | copy->pw_gecos = xstrdup(pw->pw_gecos); | |
182 | copy->pw_uid = pw->pw_uid; | |
183 | copy->pw_gid = pw->pw_gid; | |
184 | #ifdef HAVE_PW_EXPIRE_IN_PASSWD | |
185 | copy->pw_expire = pw->pw_expire; | |
186 | #endif | |
187 | #ifdef HAVE_PW_CHANGE_IN_PASSWD | |
188 | copy->pw_change = pw->pw_change; | |
189 | #endif | |
190 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
191 | copy->pw_class = xstrdup(pw->pw_class); | |
192 | #endif | |
193 | copy->pw_dir = xstrdup(pw->pw_dir); | |
194 | copy->pw_shell = xstrdup(pw->pw_shell); | |
195 | return copy; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Convert ASCII string to TCP/IP port number. | |
200 | * Port must be >0 and <=65535. | |
201 | * Return 0 if invalid. | |
202 | */ | |
203 | int | |
204 | a2port(const char *s) | |
205 | { | |
206 | long port; | |
207 | char *endp; | |
208 | ||
209 | errno = 0; | |
210 | port = strtol(s, &endp, 0); | |
211 | if (s == endp || *endp != '\0' || | |
212 | (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) || | |
213 | port <= 0 || port > 65535) | |
214 | return 0; | |
215 | ||
216 | return port; | |
217 | } | |
218 | ||
08822d99 | 219 | int |
220 | a2tun(const char *s, int *remote) | |
221 | { | |
222 | const char *errstr = NULL; | |
223 | char *sp, *ep; | |
224 | int tun; | |
225 | ||
226 | if (remote != NULL) { | |
227 | *remote = SSH_TUNID_ANY; | |
228 | sp = xstrdup(s); | |
229 | if ((ep = strchr(sp, ':')) == NULL) { | |
230 | xfree(sp); | |
231 | return (a2tun(s, NULL)); | |
232 | } | |
233 | ep[0] = '\0'; ep++; | |
234 | *remote = a2tun(ep, NULL); | |
235 | tun = a2tun(sp, NULL); | |
236 | xfree(sp); | |
237 | return (*remote == SSH_TUNID_ERR ? *remote : tun); | |
238 | } | |
239 | ||
240 | if (strcasecmp(s, "any") == 0) | |
241 | return (SSH_TUNID_ANY); | |
242 | ||
243 | tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); | |
244 | if (errstr != NULL) | |
245 | return (SSH_TUNID_ERR); | |
246 | ||
247 | return (tun); | |
248 | } | |
249 | ||
3c0ef626 | 250 | #define SECONDS 1 |
251 | #define MINUTES (SECONDS * 60) | |
252 | #define HOURS (MINUTES * 60) | |
253 | #define DAYS (HOURS * 24) | |
254 | #define WEEKS (DAYS * 7) | |
255 | ||
256 | /* | |
257 | * Convert a time string into seconds; format is | |
258 | * a sequence of: | |
259 | * time[qualifier] | |
260 | * | |
261 | * Valid time qualifiers are: | |
262 | * <none> seconds | |
263 | * s|S seconds | |
264 | * m|M minutes | |
265 | * h|H hours | |
266 | * d|D days | |
267 | * w|W weeks | |
268 | * | |
269 | * Examples: | |
270 | * 90m 90 minutes | |
271 | * 1h30m 90 minutes | |
272 | * 2d 2 days | |
273 | * 1w 1 week | |
274 | * | |
275 | * Return -1 if time string is invalid. | |
276 | */ | |
277 | long | |
278 | convtime(const char *s) | |
279 | { | |
280 | long total, secs; | |
281 | const char *p; | |
282 | char *endp; | |
283 | ||
284 | errno = 0; | |
285 | total = 0; | |
286 | p = s; | |
287 | ||
288 | if (p == NULL || *p == '\0') | |
289 | return -1; | |
290 | ||
291 | while (*p) { | |
292 | secs = strtol(p, &endp, 10); | |
293 | if (p == endp || | |
294 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || | |
295 | secs < 0) | |
296 | return -1; | |
297 | ||
298 | switch (*endp++) { | |
299 | case '\0': | |
300 | endp--; | |
301 | case 's': | |
302 | case 'S': | |
303 | break; | |
304 | case 'm': | |
305 | case 'M': | |
306 | secs *= MINUTES; | |
307 | break; | |
308 | case 'h': | |
309 | case 'H': | |
310 | secs *= HOURS; | |
311 | break; | |
312 | case 'd': | |
313 | case 'D': | |
314 | secs *= DAYS; | |
315 | break; | |
316 | case 'w': | |
317 | case 'W': | |
318 | secs *= WEEKS; | |
319 | break; | |
320 | default: | |
321 | return -1; | |
322 | } | |
323 | total += secs; | |
324 | if (total < 0) | |
325 | return -1; | |
326 | p = endp; | |
327 | } | |
328 | ||
329 | return total; | |
330 | } | |
331 | ||
dfddba3d | 332 | /* |
333 | * Search for next delimiter between hostnames/addresses and ports. | |
334 | * Argument may be modified (for termination). | |
335 | * Returns *cp if parsing succeeds. | |
336 | * *cp is set to the start of the next delimiter, if one was found. | |
337 | * If this is the last field, *cp is set to NULL. | |
338 | */ | |
339 | char * | |
340 | hpdelim(char **cp) | |
341 | { | |
342 | char *s, *old; | |
343 | ||
344 | if (cp == NULL || *cp == NULL) | |
345 | return NULL; | |
346 | ||
347 | old = s = *cp; | |
348 | if (*s == '[') { | |
349 | if ((s = strchr(s, ']')) == NULL) | |
350 | return NULL; | |
351 | else | |
352 | s++; | |
353 | } else if ((s = strpbrk(s, ":/")) == NULL) | |
354 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ | |
355 | ||
356 | switch (*s) { | |
357 | case '\0': | |
358 | *cp = NULL; /* no more fields*/ | |
359 | break; | |
8b32eddc | 360 | |
dfddba3d | 361 | case ':': |
362 | case '/': | |
363 | *s = '\0'; /* terminate */ | |
364 | *cp = s + 1; | |
365 | break; | |
8b32eddc | 366 | |
dfddba3d | 367 | default: |
368 | return NULL; | |
369 | } | |
370 | ||
371 | return old; | |
372 | } | |
373 | ||
3c0ef626 | 374 | char * |
375 | cleanhostname(char *host) | |
376 | { | |
377 | if (*host == '[' && host[strlen(host) - 1] == ']') { | |
378 | host[strlen(host) - 1] = '\0'; | |
379 | return (host + 1); | |
380 | } else | |
381 | return host; | |
382 | } | |
383 | ||
384 | char * | |
385 | colon(char *cp) | |
386 | { | |
387 | int flag = 0; | |
388 | ||
389 | if (*cp == ':') /* Leading colon is part of file name. */ | |
390 | return (0); | |
391 | if (*cp == '[') | |
392 | flag = 1; | |
393 | ||
394 | for (; *cp; ++cp) { | |
395 | if (*cp == '@' && *(cp+1) == '[') | |
396 | flag = 1; | |
397 | if (*cp == ']' && *(cp+1) == ':' && flag) | |
398 | return (cp+1); | |
399 | if (*cp == ':' && !flag) | |
400 | return (cp); | |
401 | if (*cp == '/') | |
402 | return (0); | |
403 | } | |
404 | return (0); | |
405 | } | |
406 | ||
407 | /* function to assist building execv() arguments */ | |
408 | void | |
409 | addargs(arglist *args, char *fmt, ...) | |
410 | { | |
411 | va_list ap; | |
08822d99 | 412 | char *cp; |
7e82606e | 413 | u_int nalloc; |
08822d99 | 414 | int r; |
3c0ef626 | 415 | |
416 | va_start(ap, fmt); | |
08822d99 | 417 | r = vasprintf(&cp, fmt, ap); |
3c0ef626 | 418 | va_end(ap); |
08822d99 | 419 | if (r == -1) |
420 | fatal("addargs: argument too long"); | |
3c0ef626 | 421 | |
29d88157 | 422 | nalloc = args->nalloc; |
3c0ef626 | 423 | if (args->list == NULL) { |
29d88157 | 424 | nalloc = 32; |
3c0ef626 | 425 | args->num = 0; |
29d88157 | 426 | } else if (args->num+2 >= nalloc) |
427 | nalloc *= 2; | |
3c0ef626 | 428 | |
29d88157 | 429 | args->list = xrealloc(args->list, nalloc * sizeof(char *)); |
430 | args->nalloc = nalloc; | |
08822d99 | 431 | args->list[args->num++] = cp; |
3c0ef626 | 432 | args->list[args->num] = NULL; |
433 | } | |
dfddba3d | 434 | |
08822d99 | 435 | void |
436 | replacearg(arglist *args, u_int which, char *fmt, ...) | |
437 | { | |
438 | va_list ap; | |
439 | char *cp; | |
440 | int r; | |
441 | ||
442 | va_start(ap, fmt); | |
443 | r = vasprintf(&cp, fmt, ap); | |
444 | va_end(ap); | |
445 | if (r == -1) | |
446 | fatal("replacearg: argument too long"); | |
447 | ||
448 | if (which >= args->num) | |
449 | fatal("replacearg: tried to replace invalid arg %d >= %d", | |
450 | which, args->num); | |
451 | xfree(args->list[which]); | |
452 | args->list[which] = cp; | |
453 | } | |
454 | ||
455 | void | |
456 | freeargs(arglist *args) | |
457 | { | |
458 | u_int i; | |
459 | ||
460 | if (args->list != NULL) { | |
461 | for (i = 0; i < args->num; i++) | |
462 | xfree(args->list[i]); | |
463 | xfree(args->list); | |
464 | args->nalloc = args->num = 0; | |
465 | args->list = NULL; | |
466 | } | |
467 | } | |
468 | ||
2ce0bfe4 | 469 | /* |
470 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
471 | * Warning: this calls getpw*. | |
472 | */ | |
473 | char * | |
474 | tilde_expand_filename(const char *filename, uid_t uid) | |
475 | { | |
476 | const char *path; | |
477 | char user[128], ret[MAXPATHLEN]; | |
478 | struct passwd *pw; | |
479 | u_int len, slash; | |
480 | ||
481 | if (*filename != '~') | |
482 | return (xstrdup(filename)); | |
483 | filename++; | |
484 | ||
485 | path = strchr(filename, '/'); | |
486 | if (path != NULL && path > filename) { /* ~user/path */ | |
487 | slash = path - filename; | |
488 | if (slash > sizeof(user) - 1) | |
489 | fatal("tilde_expand_filename: ~username too long"); | |
490 | memcpy(user, filename, slash); | |
491 | user[slash] = '\0'; | |
492 | if ((pw = getpwnam(user)) == NULL) | |
493 | fatal("tilde_expand_filename: No such user %s", user); | |
494 | } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ | |
495 | fatal("tilde_expand_filename: No such uid %d", uid); | |
496 | ||
497 | if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) | |
498 | fatal("tilde_expand_filename: Path too long"); | |
499 | ||
500 | /* Make sure directory has a trailing '/' */ | |
501 | len = strlen(pw->pw_dir); | |
502 | if ((len == 0 || pw->pw_dir[len - 1] != '/') && | |
503 | strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) | |
504 | fatal("tilde_expand_filename: Path too long"); | |
505 | ||
506 | /* Skip leading '/' from specified path */ | |
507 | if (path != NULL) | |
508 | filename = path + 1; | |
509 | if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) | |
510 | fatal("tilde_expand_filename: Path too long"); | |
511 | ||
512 | return (xstrdup(ret)); | |
513 | } | |
514 | ||
515 | /* | |
516 | * Expand a string with a set of %[char] escapes. A number of escapes may be | |
517 | * specified as (char *escape_chars, char *replacement) pairs. The list must | |
518 | * be terminated by a NULL escape_char. Returns replaced string in memory | |
519 | * allocated by xmalloc. | |
520 | */ | |
521 | char * | |
522 | percent_expand(const char *string, ...) | |
523 | { | |
524 | #define EXPAND_MAX_KEYS 16 | |
525 | struct { | |
526 | const char *key; | |
527 | const char *repl; | |
528 | } keys[EXPAND_MAX_KEYS]; | |
529 | u_int num_keys, i, j; | |
530 | char buf[4096]; | |
531 | va_list ap; | |
532 | ||
533 | /* Gather keys */ | |
534 | va_start(ap, string); | |
535 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { | |
536 | keys[num_keys].key = va_arg(ap, char *); | |
537 | if (keys[num_keys].key == NULL) | |
538 | break; | |
539 | keys[num_keys].repl = va_arg(ap, char *); | |
540 | if (keys[num_keys].repl == NULL) | |
541 | fatal("percent_expand: NULL replacement"); | |
542 | } | |
543 | va_end(ap); | |
544 | ||
545 | if (num_keys >= EXPAND_MAX_KEYS) | |
546 | fatal("percent_expand: too many keys"); | |
547 | ||
548 | /* Expand string */ | |
549 | *buf = '\0'; | |
550 | for (i = 0; *string != '\0'; string++) { | |
551 | if (*string != '%') { | |
552 | append: | |
553 | buf[i++] = *string; | |
554 | if (i >= sizeof(buf)) | |
555 | fatal("percent_expand: string too long"); | |
556 | buf[i] = '\0'; | |
557 | continue; | |
558 | } | |
559 | string++; | |
560 | if (*string == '%') | |
561 | goto append; | |
562 | for (j = 0; j < num_keys; j++) { | |
563 | if (strchr(keys[j].key, *string) != NULL) { | |
564 | i = strlcat(buf, keys[j].repl, sizeof(buf)); | |
565 | if (i >= sizeof(buf)) | |
566 | fatal("percent_expand: string too long"); | |
567 | break; | |
568 | } | |
569 | } | |
570 | if (j >= num_keys) | |
571 | fatal("percent_expand: unknown key %%%c", *string); | |
572 | } | |
573 | return (xstrdup(buf)); | |
574 | #undef EXPAND_MAX_KEYS | |
575 | } | |
576 | ||
dfddba3d | 577 | /* |
578 | * Read an entire line from a public key file into a static buffer, discarding | |
579 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. | |
580 | */ | |
581 | int | |
582 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, | |
583 | u_long *lineno) | |
584 | { | |
585 | while (fgets(buf, bufsz, f) != NULL) { | |
586 | (*lineno)++; | |
587 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { | |
588 | return 0; | |
589 | } else { | |
590 | debug("%s: %s line %lu exceeds size limit", __func__, | |
591 | filename, *lineno); | |
592 | /* discard remainder of line */ | |
8b32eddc | 593 | while (fgetc(f) != '\n' && !feof(f)) |
dfddba3d | 594 | ; /* nothing */ |
595 | } | |
596 | } | |
597 | return -1; | |
598 | } | |
2ce0bfe4 | 599 | |
08822d99 | 600 | int |
601 | tun_open(int tun, int mode) | |
602 | { | |
603 | #if defined(CUSTOM_SYS_TUN_OPEN) | |
604 | return (sys_tun_open(tun, mode)); | |
605 | #elif defined(SSH_TUN_OPENBSD) | |
606 | struct ifreq ifr; | |
607 | char name[100]; | |
608 | int fd = -1, sock; | |
609 | ||
610 | /* Open the tunnel device */ | |
611 | if (tun <= SSH_TUNID_MAX) { | |
612 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
613 | fd = open(name, O_RDWR); | |
614 | } else if (tun == SSH_TUNID_ANY) { | |
615 | for (tun = 100; tun >= 0; tun--) { | |
616 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
617 | if ((fd = open(name, O_RDWR)) >= 0) | |
618 | break; | |
619 | } | |
620 | } else { | |
621 | debug("%s: invalid tunnel %u", __func__, tun); | |
622 | return (-1); | |
623 | } | |
624 | ||
625 | if (fd < 0) { | |
626 | debug("%s: %s open failed: %s", __func__, name, strerror(errno)); | |
627 | return (-1); | |
628 | } | |
629 | ||
630 | debug("%s: %s mode %d fd %d", __func__, name, mode, fd); | |
631 | ||
632 | /* Set the tunnel device operation mode */ | |
633 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); | |
634 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) | |
635 | goto failed; | |
636 | ||
637 | if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) | |
638 | goto failed; | |
639 | ||
640 | /* Set interface mode */ | |
641 | ifr.ifr_flags &= ~IFF_UP; | |
642 | if (mode == SSH_TUNMODE_ETHERNET) | |
643 | ifr.ifr_flags |= IFF_LINK0; | |
644 | else | |
645 | ifr.ifr_flags &= ~IFF_LINK0; | |
646 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
647 | goto failed; | |
648 | ||
649 | /* Bring interface up */ | |
650 | ifr.ifr_flags |= IFF_UP; | |
651 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
652 | goto failed; | |
653 | ||
654 | close(sock); | |
655 | return (fd); | |
656 | ||
657 | failed: | |
658 | if (fd >= 0) | |
659 | close(fd); | |
660 | if (sock >= 0) | |
661 | close(sock); | |
662 | debug("%s: failed to set %s mode %d: %s", __func__, name, | |
663 | mode, strerror(errno)); | |
664 | return (-1); | |
665 | #else | |
666 | error("Tunnel interfaces are not supported on this platform"); | |
667 | return (-1); | |
668 | #endif | |
669 | } | |
670 | ||
671 | void | |
672 | sanitise_stdfd(void) | |
673 | { | |
674 | int nullfd, dupfd; | |
675 | ||
676 | if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { | |
677 | fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno)); | |
678 | exit(1); | |
679 | } | |
680 | while (++dupfd <= 2) { | |
681 | /* Only clobber closed fds */ | |
682 | if (fcntl(dupfd, F_GETFL, 0) >= 0) | |
683 | continue; | |
684 | if (dup2(nullfd, dupfd) == -1) { | |
685 | fprintf(stderr, "dup2: %s", strerror(errno)); | |
686 | exit(1); | |
687 | } | |
688 | } | |
689 | if (nullfd > 2) | |
690 | close(nullfd); | |
691 | } | |
692 | ||
2ce0bfe4 | 693 | char * |
694 | tohex(const u_char *d, u_int l) | |
695 | { | |
696 | char b[3], *r; | |
697 | u_int i, hl; | |
698 | ||
699 | hl = l * 2 + 1; | |
700 | r = xmalloc(hl); | |
701 | *r = '\0'; | |
702 | for (i = 0; i < l; i++) { | |
703 | snprintf(b, sizeof(b), "%02x", d[i]); | |
704 | strlcat(r, b, hl); | |
705 | } | |
706 | return (r); | |
707 | } | |
708 |