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1 | /* $OpenBSD: misc.c,v 1.72 2009/10/28 16:38:18 reyk Exp $ */ | |
2 | /* | |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
4 | * Copyright (c) 2005,2006 Damien Miller. All rights reserved. | |
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" | |
28 | ||
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 | #include <netdb.h> | |
46 | #ifdef HAVE_PATHS_H | |
47 | # include <paths.h> | |
48 | #include <pwd.h> | |
49 | #endif | |
50 | #ifdef SSH_TUN_OPENBSD | |
51 | #include <net/if.h> | |
52 | #endif | |
53 | ||
54 | #include "xmalloc.h" | |
55 | #include "misc.h" | |
56 | #include "log.h" | |
57 | #include "ssh.h" | |
58 | ||
59 | /* remove newline at end of string */ | |
60 | char * | |
61 | chop(char *s) | |
62 | { | |
63 | char *t = s; | |
64 | while (*t) { | |
65 | if (*t == '\n' || *t == '\r') { | |
66 | *t = '\0'; | |
67 | return s; | |
68 | } | |
69 | t++; | |
70 | } | |
71 | return s; | |
72 | ||
73 | } | |
74 | ||
75 | /* set/unset filedescriptor to non-blocking */ | |
76 | int | |
77 | set_nonblock(int fd) | |
78 | { | |
79 | int val; | |
80 | ||
81 | val = fcntl(fd, F_GETFL, 0); | |
82 | if (val < 0) { | |
83 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
84 | return (-1); | |
85 | } | |
86 | if (val & O_NONBLOCK) { | |
87 | debug3("fd %d is O_NONBLOCK", fd); | |
88 | return (0); | |
89 | } | |
90 | debug2("fd %d setting O_NONBLOCK", fd); | |
91 | val |= O_NONBLOCK; | |
92 | if (fcntl(fd, F_SETFL, val) == -1) { | |
93 | debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, | |
94 | strerror(errno)); | |
95 | return (-1); | |
96 | } | |
97 | return (0); | |
98 | } | |
99 | ||
100 | int | |
101 | unset_nonblock(int fd) | |
102 | { | |
103 | int val; | |
104 | ||
105 | val = fcntl(fd, F_GETFL, 0); | |
106 | if (val < 0) { | |
107 | error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); | |
108 | return (-1); | |
109 | } | |
110 | if (!(val & O_NONBLOCK)) { | |
111 | debug3("fd %d is not O_NONBLOCK", fd); | |
112 | return (0); | |
113 | } | |
114 | debug("fd %d clearing O_NONBLOCK", fd); | |
115 | val &= ~O_NONBLOCK; | |
116 | if (fcntl(fd, F_SETFL, val) == -1) { | |
117 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", | |
118 | fd, strerror(errno)); | |
119 | return (-1); | |
120 | } | |
121 | return (0); | |
122 | } | |
123 | ||
124 | const char * | |
125 | ssh_gai_strerror(int gaierr) | |
126 | { | |
127 | if (gaierr == EAI_SYSTEM) | |
128 | return strerror(errno); | |
129 | return gai_strerror(gaierr); | |
130 | } | |
131 | ||
132 | /* disable nagle on socket */ | |
133 | void | |
134 | set_nodelay(int fd) | |
135 | { | |
136 | int opt; | |
137 | socklen_t optlen; | |
138 | ||
139 | optlen = sizeof opt; | |
140 | if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { | |
141 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); | |
142 | return; | |
143 | } | |
144 | if (opt == 1) { | |
145 | debug2("fd %d is TCP_NODELAY", fd); | |
146 | return; | |
147 | } | |
148 | opt = 1; | |
149 | debug2("fd %d setting TCP_NODELAY", fd); | |
150 | if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) | |
151 | error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); | |
152 | } | |
153 | ||
154 | /* open a socket in the specified routing domain */ | |
155 | int | |
156 | socket_rdomain(int domain, int type, int protocol, int rdomain) | |
157 | { | |
158 | int sock, ipproto = IPPROTO_IP; | |
159 | ||
160 | if ((sock = socket(domain, type, protocol)) == -1) | |
161 | return (-1); | |
162 | ||
163 | if (rdomain == -1) | |
164 | return (sock); | |
165 | ||
166 | switch (domain) { | |
167 | case AF_INET6: | |
168 | ipproto = IPPROTO_IPV6; | |
169 | /* FALLTHROUGH */ | |
170 | case AF_INET: | |
171 | debug2("socket %d af %d setting rdomain %d", | |
172 | sock, domain, rdomain); | |
173 | if (setsockopt(sock, ipproto, SO_RDOMAIN, &rdomain, | |
174 | sizeof(rdomain)) == -1) { | |
175 | debug("setsockopt SO_RDOMAIN: %.100s", | |
176 | strerror(errno)); | |
177 | close(sock); | |
178 | return (-1); | |
179 | } | |
180 | break; | |
181 | default: | |
182 | debug("socket %d af %d does not support rdomain %d", | |
183 | sock, domain, rdomain); | |
184 | close(sock); | |
185 | return (-1); | |
186 | } | |
187 | ||
188 | return (sock); | |
189 | } | |
190 | ||
191 | /* Characters considered whitespace in strsep calls. */ | |
192 | #define WHITESPACE " \t\r\n" | |
193 | #define QUOTE "\"" | |
194 | ||
195 | /* return next token in configuration line */ | |
196 | char * | |
197 | strdelim(char **s) | |
198 | { | |
199 | char *old; | |
200 | int wspace = 0; | |
201 | ||
202 | if (*s == NULL) | |
203 | return NULL; | |
204 | ||
205 | old = *s; | |
206 | ||
207 | *s = strpbrk(*s, WHITESPACE QUOTE "="); | |
208 | if (*s == NULL) | |
209 | return (old); | |
210 | ||
211 | if (*s[0] == '\"') { | |
212 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ | |
213 | /* Find matching quote */ | |
214 | if ((*s = strpbrk(*s, QUOTE)) == NULL) { | |
215 | return (NULL); /* no matching quote */ | |
216 | } else { | |
217 | *s[0] = '\0'; | |
218 | return (old); | |
219 | } | |
220 | } | |
221 | ||
222 | /* Allow only one '=' to be skipped */ | |
223 | if (*s[0] == '=') | |
224 | wspace = 1; | |
225 | *s[0] = '\0'; | |
226 | ||
227 | /* Skip any extra whitespace after first token */ | |
228 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
229 | if (*s[0] == '=' && !wspace) | |
230 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
231 | ||
232 | return (old); | |
233 | } | |
234 | ||
235 | struct passwd * | |
236 | pwcopy(struct passwd *pw) | |
237 | { | |
238 | struct passwd *copy = xcalloc(1, sizeof(*copy)); | |
239 | ||
240 | copy->pw_name = xstrdup(pw->pw_name); | |
241 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
242 | copy->pw_gecos = xstrdup(pw->pw_gecos); | |
243 | copy->pw_uid = pw->pw_uid; | |
244 | copy->pw_gid = pw->pw_gid; | |
245 | #ifdef HAVE_PW_EXPIRE_IN_PASSWD | |
246 | copy->pw_expire = pw->pw_expire; | |
247 | #endif | |
248 | #ifdef HAVE_PW_CHANGE_IN_PASSWD | |
249 | copy->pw_change = pw->pw_change; | |
250 | #endif | |
251 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
252 | copy->pw_class = xstrdup(pw->pw_class); | |
253 | #endif | |
254 | copy->pw_dir = xstrdup(pw->pw_dir); | |
255 | copy->pw_shell = xstrdup(pw->pw_shell); | |
256 | return copy; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Convert ASCII string to TCP/IP port number. | |
261 | * Port must be >=0 and <=65535. | |
262 | * Return -1 if invalid. | |
263 | */ | |
264 | int | |
265 | a2port(const char *s) | |
266 | { | |
267 | long long port; | |
268 | const char *errstr; | |
269 | ||
270 | port = strtonum(s, 0, 65535, &errstr); | |
271 | if (errstr != NULL) | |
272 | return -1; | |
273 | return (int)port; | |
274 | } | |
275 | ||
276 | int | |
277 | a2tun(const char *s, int *remote) | |
278 | { | |
279 | const char *errstr = NULL; | |
280 | char *sp, *ep; | |
281 | int tun; | |
282 | ||
283 | if (remote != NULL) { | |
284 | *remote = SSH_TUNID_ANY; | |
285 | sp = xstrdup(s); | |
286 | if ((ep = strchr(sp, ':')) == NULL) { | |
287 | xfree(sp); | |
288 | return (a2tun(s, NULL)); | |
289 | } | |
290 | ep[0] = '\0'; ep++; | |
291 | *remote = a2tun(ep, NULL); | |
292 | tun = a2tun(sp, NULL); | |
293 | xfree(sp); | |
294 | return (*remote == SSH_TUNID_ERR ? *remote : tun); | |
295 | } | |
296 | ||
297 | if (strcasecmp(s, "any") == 0) | |
298 | return (SSH_TUNID_ANY); | |
299 | ||
300 | tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); | |
301 | if (errstr != NULL) | |
302 | return (SSH_TUNID_ERR); | |
303 | ||
304 | return (tun); | |
305 | } | |
306 | ||
307 | #define SECONDS 1 | |
308 | #define MINUTES (SECONDS * 60) | |
309 | #define HOURS (MINUTES * 60) | |
310 | #define DAYS (HOURS * 24) | |
311 | #define WEEKS (DAYS * 7) | |
312 | ||
313 | /* | |
314 | * Convert a time string into seconds; format is | |
315 | * a sequence of: | |
316 | * time[qualifier] | |
317 | * | |
318 | * Valid time qualifiers are: | |
319 | * <none> seconds | |
320 | * s|S seconds | |
321 | * m|M minutes | |
322 | * h|H hours | |
323 | * d|D days | |
324 | * w|W weeks | |
325 | * | |
326 | * Examples: | |
327 | * 90m 90 minutes | |
328 | * 1h30m 90 minutes | |
329 | * 2d 2 days | |
330 | * 1w 1 week | |
331 | * | |
332 | * Return -1 if time string is invalid. | |
333 | */ | |
334 | long | |
335 | convtime(const char *s) | |
336 | { | |
337 | long total, secs; | |
338 | const char *p; | |
339 | char *endp; | |
340 | ||
341 | errno = 0; | |
342 | total = 0; | |
343 | p = s; | |
344 | ||
345 | if (p == NULL || *p == '\0') | |
346 | return -1; | |
347 | ||
348 | while (*p) { | |
349 | secs = strtol(p, &endp, 10); | |
350 | if (p == endp || | |
351 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || | |
352 | secs < 0) | |
353 | return -1; | |
354 | ||
355 | switch (*endp++) { | |
356 | case '\0': | |
357 | endp--; | |
358 | break; | |
359 | case 's': | |
360 | case 'S': | |
361 | break; | |
362 | case 'm': | |
363 | case 'M': | |
364 | secs *= MINUTES; | |
365 | break; | |
366 | case 'h': | |
367 | case 'H': | |
368 | secs *= HOURS; | |
369 | break; | |
370 | case 'd': | |
371 | case 'D': | |
372 | secs *= DAYS; | |
373 | break; | |
374 | case 'w': | |
375 | case 'W': | |
376 | secs *= WEEKS; | |
377 | break; | |
378 | default: | |
379 | return -1; | |
380 | } | |
381 | total += secs; | |
382 | if (total < 0) | |
383 | return -1; | |
384 | p = endp; | |
385 | } | |
386 | ||
387 | return total; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Returns a standardized host+port identifier string. | |
392 | * Caller must free returned string. | |
393 | */ | |
394 | char * | |
395 | put_host_port(const char *host, u_short port) | |
396 | { | |
397 | char *hoststr; | |
398 | ||
399 | if (port == 0 || port == SSH_DEFAULT_PORT) | |
400 | return(xstrdup(host)); | |
401 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) | |
402 | fatal("put_host_port: asprintf: %s", strerror(errno)); | |
403 | debug3("put_host_port: %s", hoststr); | |
404 | return hoststr; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Search for next delimiter between hostnames/addresses and ports. | |
409 | * Argument may be modified (for termination). | |
410 | * Returns *cp if parsing succeeds. | |
411 | * *cp is set to the start of the next delimiter, if one was found. | |
412 | * If this is the last field, *cp is set to NULL. | |
413 | */ | |
414 | char * | |
415 | hpdelim(char **cp) | |
416 | { | |
417 | char *s, *old; | |
418 | ||
419 | if (cp == NULL || *cp == NULL) | |
420 | return NULL; | |
421 | ||
422 | old = s = *cp; | |
423 | if (*s == '[') { | |
424 | if ((s = strchr(s, ']')) == NULL) | |
425 | return NULL; | |
426 | else | |
427 | s++; | |
428 | } else if ((s = strpbrk(s, ":/")) == NULL) | |
429 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ | |
430 | ||
431 | switch (*s) { | |
432 | case '\0': | |
433 | *cp = NULL; /* no more fields*/ | |
434 | break; | |
435 | ||
436 | case ':': | |
437 | case '/': | |
438 | *s = '\0'; /* terminate */ | |
439 | *cp = s + 1; | |
440 | break; | |
441 | ||
442 | default: | |
443 | return NULL; | |
444 | } | |
445 | ||
446 | return old; | |
447 | } | |
448 | ||
449 | char * | |
450 | cleanhostname(char *host) | |
451 | { | |
452 | if (*host == '[' && host[strlen(host) - 1] == ']') { | |
453 | host[strlen(host) - 1] = '\0'; | |
454 | return (host + 1); | |
455 | } else | |
456 | return host; | |
457 | } | |
458 | ||
459 | char * | |
460 | colon(char *cp) | |
461 | { | |
462 | int flag = 0; | |
463 | ||
464 | if (*cp == ':') /* Leading colon is part of file name. */ | |
465 | return (0); | |
466 | if (*cp == '[') | |
467 | flag = 1; | |
468 | ||
469 | for (; *cp; ++cp) { | |
470 | if (*cp == '@' && *(cp+1) == '[') | |
471 | flag = 1; | |
472 | if (*cp == ']' && *(cp+1) == ':' && flag) | |
473 | return (cp+1); | |
474 | if (*cp == ':' && !flag) | |
475 | return (cp); | |
476 | if (*cp == '/') | |
477 | return (0); | |
478 | } | |
479 | return (0); | |
480 | } | |
481 | ||
482 | /* function to assist building execv() arguments */ | |
483 | void | |
484 | addargs(arglist *args, char *fmt, ...) | |
485 | { | |
486 | va_list ap; | |
487 | char *cp; | |
488 | u_int nalloc; | |
489 | int r; | |
490 | ||
491 | va_start(ap, fmt); | |
492 | r = vasprintf(&cp, fmt, ap); | |
493 | va_end(ap); | |
494 | if (r == -1) | |
495 | fatal("addargs: argument too long"); | |
496 | ||
497 | nalloc = args->nalloc; | |
498 | if (args->list == NULL) { | |
499 | nalloc = 32; | |
500 | args->num = 0; | |
501 | } else if (args->num+2 >= nalloc) | |
502 | nalloc *= 2; | |
503 | ||
504 | args->list = xrealloc(args->list, nalloc, sizeof(char *)); | |
505 | args->nalloc = nalloc; | |
506 | args->list[args->num++] = cp; | |
507 | args->list[args->num] = NULL; | |
508 | } | |
509 | ||
510 | void | |
511 | replacearg(arglist *args, u_int which, char *fmt, ...) | |
512 | { | |
513 | va_list ap; | |
514 | char *cp; | |
515 | int r; | |
516 | ||
517 | va_start(ap, fmt); | |
518 | r = vasprintf(&cp, fmt, ap); | |
519 | va_end(ap); | |
520 | if (r == -1) | |
521 | fatal("replacearg: argument too long"); | |
522 | ||
523 | if (which >= args->num) | |
524 | fatal("replacearg: tried to replace invalid arg %d >= %d", | |
525 | which, args->num); | |
526 | xfree(args->list[which]); | |
527 | args->list[which] = cp; | |
528 | } | |
529 | ||
530 | void | |
531 | freeargs(arglist *args) | |
532 | { | |
533 | u_int i; | |
534 | ||
535 | if (args->list != NULL) { | |
536 | for (i = 0; i < args->num; i++) | |
537 | xfree(args->list[i]); | |
538 | xfree(args->list); | |
539 | args->nalloc = args->num = 0; | |
540 | args->list = NULL; | |
541 | } | |
542 | } | |
543 | ||
544 | /* | |
545 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
546 | * Warning: this calls getpw*. | |
547 | */ | |
548 | char * | |
549 | tilde_expand_filename(const char *filename, uid_t uid) | |
550 | { | |
551 | const char *path; | |
552 | char user[128], ret[MAXPATHLEN]; | |
553 | struct passwd *pw; | |
554 | u_int len, slash; | |
555 | ||
556 | if (*filename != '~') | |
557 | return (xstrdup(filename)); | |
558 | filename++; | |
559 | ||
560 | path = strchr(filename, '/'); | |
561 | if (path != NULL && path > filename) { /* ~user/path */ | |
562 | slash = path - filename; | |
563 | if (slash > sizeof(user) - 1) | |
564 | fatal("tilde_expand_filename: ~username too long"); | |
565 | memcpy(user, filename, slash); | |
566 | user[slash] = '\0'; | |
567 | if ((pw = getpwnam(user)) == NULL) | |
568 | fatal("tilde_expand_filename: No such user %s", user); | |
569 | } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ | |
570 | fatal("tilde_expand_filename: No such uid %ld", (long)uid); | |
571 | ||
572 | if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) | |
573 | fatal("tilde_expand_filename: Path too long"); | |
574 | ||
575 | /* Make sure directory has a trailing '/' */ | |
576 | len = strlen(pw->pw_dir); | |
577 | if ((len == 0 || pw->pw_dir[len - 1] != '/') && | |
578 | strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) | |
579 | fatal("tilde_expand_filename: Path too long"); | |
580 | ||
581 | /* Skip leading '/' from specified path */ | |
582 | if (path != NULL) | |
583 | filename = path + 1; | |
584 | if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) | |
585 | fatal("tilde_expand_filename: Path too long"); | |
586 | ||
587 | return (xstrdup(ret)); | |
588 | } | |
589 | ||
590 | /* | |
591 | * Expand a string with a set of %[char] escapes. A number of escapes may be | |
592 | * specified as (char *escape_chars, char *replacement) pairs. The list must | |
593 | * be terminated by a NULL escape_char. Returns replaced string in memory | |
594 | * allocated by xmalloc. | |
595 | */ | |
596 | char * | |
597 | percent_expand(const char *string, ...) | |
598 | { | |
599 | #define EXPAND_MAX_KEYS 16 | |
600 | struct { | |
601 | const char *key; | |
602 | const char *repl; | |
603 | } keys[EXPAND_MAX_KEYS]; | |
604 | u_int num_keys, i, j; | |
605 | char buf[4096]; | |
606 | va_list ap; | |
607 | ||
608 | /* Gather keys */ | |
609 | va_start(ap, string); | |
610 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { | |
611 | keys[num_keys].key = va_arg(ap, char *); | |
612 | if (keys[num_keys].key == NULL) | |
613 | break; | |
614 | keys[num_keys].repl = va_arg(ap, char *); | |
615 | if (keys[num_keys].repl == NULL) | |
616 | fatal("percent_expand: NULL replacement"); | |
617 | } | |
618 | va_end(ap); | |
619 | ||
620 | if (num_keys >= EXPAND_MAX_KEYS) | |
621 | fatal("percent_expand: too many keys"); | |
622 | ||
623 | /* Expand string */ | |
624 | *buf = '\0'; | |
625 | for (i = 0; *string != '\0'; string++) { | |
626 | if (*string != '%') { | |
627 | append: | |
628 | buf[i++] = *string; | |
629 | if (i >= sizeof(buf)) | |
630 | fatal("percent_expand: string too long"); | |
631 | buf[i] = '\0'; | |
632 | continue; | |
633 | } | |
634 | string++; | |
635 | if (*string == '%') | |
636 | goto append; | |
637 | for (j = 0; j < num_keys; j++) { | |
638 | if (strchr(keys[j].key, *string) != NULL) { | |
639 | i = strlcat(buf, keys[j].repl, sizeof(buf)); | |
640 | if (i >= sizeof(buf)) | |
641 | fatal("percent_expand: string too long"); | |
642 | break; | |
643 | } | |
644 | } | |
645 | if (j >= num_keys) | |
646 | fatal("percent_expand: unknown key %%%c", *string); | |
647 | } | |
648 | return (xstrdup(buf)); | |
649 | #undef EXPAND_MAX_KEYS | |
650 | } | |
651 | ||
652 | /* | |
653 | * Read an entire line from a public key file into a static buffer, discarding | |
654 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. | |
655 | */ | |
656 | int | |
657 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, | |
658 | u_long *lineno) | |
659 | { | |
660 | while (fgets(buf, bufsz, f) != NULL) { | |
661 | if (buf[0] == '\0') | |
662 | continue; | |
663 | (*lineno)++; | |
664 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { | |
665 | return 0; | |
666 | } else { | |
667 | debug("%s: %s line %lu exceeds size limit", __func__, | |
668 | filename, *lineno); | |
669 | /* discard remainder of line */ | |
670 | while (fgetc(f) != '\n' && !feof(f)) | |
671 | ; /* nothing */ | |
672 | } | |
673 | } | |
674 | return -1; | |
675 | } | |
676 | ||
677 | int | |
678 | tun_open(int tun, int mode) | |
679 | { | |
680 | #if defined(CUSTOM_SYS_TUN_OPEN) | |
681 | return (sys_tun_open(tun, mode)); | |
682 | #elif defined(SSH_TUN_OPENBSD) | |
683 | struct ifreq ifr; | |
684 | char name[100]; | |
685 | int fd = -1, sock; | |
686 | ||
687 | /* Open the tunnel device */ | |
688 | if (tun <= SSH_TUNID_MAX) { | |
689 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
690 | fd = open(name, O_RDWR); | |
691 | } else if (tun == SSH_TUNID_ANY) { | |
692 | for (tun = 100; tun >= 0; tun--) { | |
693 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
694 | if ((fd = open(name, O_RDWR)) >= 0) | |
695 | break; | |
696 | } | |
697 | } else { | |
698 | debug("%s: invalid tunnel %u", __func__, tun); | |
699 | return (-1); | |
700 | } | |
701 | ||
702 | if (fd < 0) { | |
703 | debug("%s: %s open failed: %s", __func__, name, strerror(errno)); | |
704 | return (-1); | |
705 | } | |
706 | ||
707 | debug("%s: %s mode %d fd %d", __func__, name, mode, fd); | |
708 | ||
709 | /* Set the tunnel device operation mode */ | |
710 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); | |
711 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) | |
712 | goto failed; | |
713 | ||
714 | if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) | |
715 | goto failed; | |
716 | ||
717 | /* Set interface mode */ | |
718 | ifr.ifr_flags &= ~IFF_UP; | |
719 | if (mode == SSH_TUNMODE_ETHERNET) | |
720 | ifr.ifr_flags |= IFF_LINK0; | |
721 | else | |
722 | ifr.ifr_flags &= ~IFF_LINK0; | |
723 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
724 | goto failed; | |
725 | ||
726 | /* Bring interface up */ | |
727 | ifr.ifr_flags |= IFF_UP; | |
728 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
729 | goto failed; | |
730 | ||
731 | close(sock); | |
732 | return (fd); | |
733 | ||
734 | failed: | |
735 | if (fd >= 0) | |
736 | close(fd); | |
737 | if (sock >= 0) | |
738 | close(sock); | |
739 | debug("%s: failed to set %s mode %d: %s", __func__, name, | |
740 | mode, strerror(errno)); | |
741 | return (-1); | |
742 | #else | |
743 | error("Tunnel interfaces are not supported on this platform"); | |
744 | return (-1); | |
745 | #endif | |
746 | } | |
747 | ||
748 | void | |
749 | sanitise_stdfd(void) | |
750 | { | |
751 | int nullfd, dupfd; | |
752 | ||
753 | if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { | |
754 | fprintf(stderr, "Couldn't open /dev/null: %s\n", | |
755 | strerror(errno)); | |
756 | exit(1); | |
757 | } | |
758 | while (++dupfd <= 2) { | |
759 | /* Only clobber closed fds */ | |
760 | if (fcntl(dupfd, F_GETFL, 0) >= 0) | |
761 | continue; | |
762 | if (dup2(nullfd, dupfd) == -1) { | |
763 | fprintf(stderr, "dup2: %s\n", strerror(errno)); | |
764 | exit(1); | |
765 | } | |
766 | } | |
767 | if (nullfd > 2) | |
768 | close(nullfd); | |
769 | } | |
770 | ||
771 | char * | |
772 | tohex(const void *vp, size_t l) | |
773 | { | |
774 | const u_char *p = (const u_char *)vp; | |
775 | char b[3], *r; | |
776 | size_t i, hl; | |
777 | ||
778 | if (l > 65536) | |
779 | return xstrdup("tohex: length > 65536"); | |
780 | ||
781 | hl = l * 2 + 1; | |
782 | r = xcalloc(1, hl); | |
783 | for (i = 0; i < l; i++) { | |
784 | snprintf(b, sizeof(b), "%02x", p[i]); | |
785 | strlcat(r, b, hl); | |
786 | } | |
787 | return (r); | |
788 | } | |
789 | ||
790 | u_int64_t | |
791 | get_u64(const void *vp) | |
792 | { | |
793 | const u_char *p = (const u_char *)vp; | |
794 | u_int64_t v; | |
795 | ||
796 | v = (u_int64_t)p[0] << 56; | |
797 | v |= (u_int64_t)p[1] << 48; | |
798 | v |= (u_int64_t)p[2] << 40; | |
799 | v |= (u_int64_t)p[3] << 32; | |
800 | v |= (u_int64_t)p[4] << 24; | |
801 | v |= (u_int64_t)p[5] << 16; | |
802 | v |= (u_int64_t)p[6] << 8; | |
803 | v |= (u_int64_t)p[7]; | |
804 | ||
805 | return (v); | |
806 | } | |
807 | ||
808 | u_int32_t | |
809 | get_u32(const void *vp) | |
810 | { | |
811 | const u_char *p = (const u_char *)vp; | |
812 | u_int32_t v; | |
813 | ||
814 | v = (u_int32_t)p[0] << 24; | |
815 | v |= (u_int32_t)p[1] << 16; | |
816 | v |= (u_int32_t)p[2] << 8; | |
817 | v |= (u_int32_t)p[3]; | |
818 | ||
819 | return (v); | |
820 | } | |
821 | ||
822 | u_int16_t | |
823 | get_u16(const void *vp) | |
824 | { | |
825 | const u_char *p = (const u_char *)vp; | |
826 | u_int16_t v; | |
827 | ||
828 | v = (u_int16_t)p[0] << 8; | |
829 | v |= (u_int16_t)p[1]; | |
830 | ||
831 | return (v); | |
832 | } | |
833 | ||
834 | void | |
835 | put_u64(void *vp, u_int64_t v) | |
836 | { | |
837 | u_char *p = (u_char *)vp; | |
838 | ||
839 | p[0] = (u_char)(v >> 56) & 0xff; | |
840 | p[1] = (u_char)(v >> 48) & 0xff; | |
841 | p[2] = (u_char)(v >> 40) & 0xff; | |
842 | p[3] = (u_char)(v >> 32) & 0xff; | |
843 | p[4] = (u_char)(v >> 24) & 0xff; | |
844 | p[5] = (u_char)(v >> 16) & 0xff; | |
845 | p[6] = (u_char)(v >> 8) & 0xff; | |
846 | p[7] = (u_char)v & 0xff; | |
847 | } | |
848 | ||
849 | void | |
850 | put_u32(void *vp, u_int32_t v) | |
851 | { | |
852 | u_char *p = (u_char *)vp; | |
853 | ||
854 | p[0] = (u_char)(v >> 24) & 0xff; | |
855 | p[1] = (u_char)(v >> 16) & 0xff; | |
856 | p[2] = (u_char)(v >> 8) & 0xff; | |
857 | p[3] = (u_char)v & 0xff; | |
858 | } | |
859 | ||
860 | ||
861 | void | |
862 | put_u16(void *vp, u_int16_t v) | |
863 | { | |
864 | u_char *p = (u_char *)vp; | |
865 | ||
866 | p[0] = (u_char)(v >> 8) & 0xff; | |
867 | p[1] = (u_char)v & 0xff; | |
868 | } | |
869 | ||
870 | void | |
871 | ms_subtract_diff(struct timeval *start, int *ms) | |
872 | { | |
873 | struct timeval diff, finish; | |
874 | ||
875 | gettimeofday(&finish, NULL); | |
876 | timersub(&finish, start, &diff); | |
877 | *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); | |
878 | } | |
879 | ||
880 | void | |
881 | ms_to_timeval(struct timeval *tv, int ms) | |
882 | { | |
883 | if (ms < 0) | |
884 | ms = 0; | |
885 | tv->tv_sec = ms / 1000; | |
886 | tv->tv_usec = (ms % 1000) * 1000; | |
887 | } | |
888 | ||
889 | void | |
890 | sock_set_v6only(int s) | |
891 | { | |
892 | #ifdef IPV6_V6ONLY | |
893 | int on = 1; | |
894 | ||
895 | debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); | |
896 | if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) | |
897 | error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); | |
898 | #endif | |
899 | } |