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5262cbfb | 1 | /* $OpenBSD: misc.c,v 1.71 2009/02/21 19:32:04 tobias Exp $ */ |
3c0ef626 | 2 | /* |
3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
30460aeb | 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" | |
08822d99 | 28 | |
30460aeb | 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> | |
e74dc197 | 45 | #include <netdb.h> |
30460aeb | 46 | #ifdef HAVE_PATHS_H |
47 | # include <paths.h> | |
48 | #include <pwd.h> | |
49 | #endif | |
08822d99 | 50 | #ifdef SSH_TUN_OPENBSD |
51 | #include <net/if.h> | |
52 | #endif | |
3c0ef626 | 53 | |
30460aeb | 54 | #include "xmalloc.h" |
3c0ef626 | 55 | #include "misc.h" |
56 | #include "log.h" | |
30460aeb | 57 | #include "ssh.h" |
3c0ef626 | 58 | |
59 | /* remove newline at end of string */ | |
60 | char * | |
61 | chop(char *s) | |
62 | { | |
63 | char *t = s; | |
64 | while (*t) { | |
75be3237 | 65 | if (*t == '\n' || *t == '\r') { |
3c0ef626 | 66 | *t = '\0'; |
67 | return s; | |
68 | } | |
69 | t++; | |
70 | } | |
71 | return s; | |
72 | ||
73 | } | |
74 | ||
75 | /* set/unset filedescriptor to non-blocking */ | |
7e82606e | 76 | int |
3c0ef626 | 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)); | |
7e82606e | 84 | return (-1); |
3c0ef626 | 85 | } |
86 | if (val & O_NONBLOCK) { | |
7e82606e | 87 | debug3("fd %d is O_NONBLOCK", fd); |
88 | return (0); | |
3c0ef626 | 89 | } |
7cac2b65 | 90 | debug2("fd %d setting O_NONBLOCK", fd); |
3c0ef626 | 91 | val |= O_NONBLOCK; |
7e82606e | 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); | |
3c0ef626 | 98 | } |
99 | ||
7e82606e | 100 | int |
3c0ef626 | 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)); | |
7e82606e | 108 | return (-1); |
3c0ef626 | 109 | } |
110 | if (!(val & O_NONBLOCK)) { | |
7e82606e | 111 | debug3("fd %d is not O_NONBLOCK", fd); |
112 | return (0); | |
3c0ef626 | 113 | } |
114 | debug("fd %d clearing O_NONBLOCK", fd); | |
115 | val &= ~O_NONBLOCK; | |
7e82606e | 116 | if (fcntl(fd, F_SETFL, val) == -1) { |
117 | debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", | |
75be3237 | 118 | fd, strerror(errno)); |
7e82606e | 119 | return (-1); |
120 | } | |
121 | return (0); | |
75be3237 | 122 | } |
123 | ||
e74dc197 | 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 | ||
75be3237 | 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) { | |
540d72c3 | 141 | debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); |
75be3237 | 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)); | |
3c0ef626 | 152 | } |
153 | ||
154 | /* Characters considered whitespace in strsep calls. */ | |
155 | #define WHITESPACE " \t\r\n" | |
30460aeb | 156 | #define QUOTE "\"" |
3c0ef626 | 157 | |
75be3237 | 158 | /* Characters considered as quotations. */ |
159 | #define QUOTES "'\"" | |
160 | ||
3c0ef626 | 161 | /* return next token in configuration line */ |
162 | char * | |
163 | strdelim(char **s) | |
164 | { | |
75be3237 | 165 | char *old, *p, *q; |
3c0ef626 | 166 | int wspace = 0; |
167 | ||
168 | if (*s == NULL) | |
169 | return NULL; | |
170 | ||
171 | old = *s; | |
172 | ||
75be3237 | 173 | if ((q=strchr(QUOTES, (int) *old)) && *q) |
174 | { | |
175 | /* find next quote character, point old to start of quoted | |
176 | * string */ | |
177 | for (p = ++old;*p && *p!=*q; p++) | |
178 | ; | |
179 | ||
180 | /* find start of next token */ | |
181 | *s = (*p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL; | |
182 | ||
183 | /* terminate 'old' token */ | |
184 | *p = '\0'; | |
185 | return (old); | |
186 | } | |
187 | ||
30460aeb | 188 | *s = strpbrk(*s, WHITESPACE QUOTE "="); |
3c0ef626 | 189 | if (*s == NULL) |
190 | return (old); | |
191 | ||
30460aeb | 192 | if (*s[0] == '\"') { |
193 | memmove(*s, *s + 1, strlen(*s)); /* move nul too */ | |
194 | /* Find matching quote */ | |
195 | if ((*s = strpbrk(*s, QUOTE)) == NULL) { | |
196 | return (NULL); /* no matching quote */ | |
197 | } else { | |
198 | *s[0] = '\0'; | |
199 | return (old); | |
200 | } | |
201 | } | |
202 | ||
3c0ef626 | 203 | /* Allow only one '=' to be skipped */ |
204 | if (*s[0] == '=') | |
205 | wspace = 1; | |
206 | *s[0] = '\0'; | |
207 | ||
30460aeb | 208 | /* Skip any extra whitespace after first token */ |
3c0ef626 | 209 | *s += strspn(*s + 1, WHITESPACE) + 1; |
210 | if (*s[0] == '=' && !wspace) | |
211 | *s += strspn(*s + 1, WHITESPACE) + 1; | |
212 | ||
213 | return (old); | |
214 | } | |
215 | ||
216 | struct passwd * | |
217 | pwcopy(struct passwd *pw) | |
218 | { | |
30460aeb | 219 | struct passwd *copy = xcalloc(1, sizeof(*copy)); |
3c0ef626 | 220 | |
3c0ef626 | 221 | copy->pw_name = xstrdup(pw->pw_name); |
222 | copy->pw_passwd = xstrdup(pw->pw_passwd); | |
223 | copy->pw_gecos = xstrdup(pw->pw_gecos); | |
224 | copy->pw_uid = pw->pw_uid; | |
225 | copy->pw_gid = pw->pw_gid; | |
226 | #ifdef HAVE_PW_EXPIRE_IN_PASSWD | |
227 | copy->pw_expire = pw->pw_expire; | |
228 | #endif | |
229 | #ifdef HAVE_PW_CHANGE_IN_PASSWD | |
230 | copy->pw_change = pw->pw_change; | |
231 | #endif | |
232 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
233 | copy->pw_class = xstrdup(pw->pw_class); | |
234 | #endif | |
235 | copy->pw_dir = xstrdup(pw->pw_dir); | |
236 | copy->pw_shell = xstrdup(pw->pw_shell); | |
237 | return copy; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Convert ASCII string to TCP/IP port number. | |
5262cbfb | 242 | * Port must be >=0 and <=65535. |
243 | * Return -1 if invalid. | |
3c0ef626 | 244 | */ |
245 | int | |
246 | a2port(const char *s) | |
247 | { | |
5262cbfb | 248 | long long port; |
249 | const char *errstr; | |
3c0ef626 | 250 | |
5262cbfb | 251 | port = strtonum(s, 0, 65535, &errstr); |
252 | if (errstr != NULL) | |
253 | return -1; | |
254 | return (int)port; | |
3c0ef626 | 255 | } |
256 | ||
08822d99 | 257 | int |
258 | a2tun(const char *s, int *remote) | |
259 | { | |
260 | const char *errstr = NULL; | |
261 | char *sp, *ep; | |
262 | int tun; | |
263 | ||
264 | if (remote != NULL) { | |
265 | *remote = SSH_TUNID_ANY; | |
266 | sp = xstrdup(s); | |
267 | if ((ep = strchr(sp, ':')) == NULL) { | |
268 | xfree(sp); | |
269 | return (a2tun(s, NULL)); | |
270 | } | |
271 | ep[0] = '\0'; ep++; | |
272 | *remote = a2tun(ep, NULL); | |
273 | tun = a2tun(sp, NULL); | |
274 | xfree(sp); | |
275 | return (*remote == SSH_TUNID_ERR ? *remote : tun); | |
276 | } | |
277 | ||
278 | if (strcasecmp(s, "any") == 0) | |
279 | return (SSH_TUNID_ANY); | |
280 | ||
281 | tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); | |
282 | if (errstr != NULL) | |
283 | return (SSH_TUNID_ERR); | |
284 | ||
285 | return (tun); | |
286 | } | |
287 | ||
3c0ef626 | 288 | #define SECONDS 1 |
289 | #define MINUTES (SECONDS * 60) | |
290 | #define HOURS (MINUTES * 60) | |
291 | #define DAYS (HOURS * 24) | |
292 | #define WEEKS (DAYS * 7) | |
293 | ||
294 | /* | |
295 | * Convert a time string into seconds; format is | |
296 | * a sequence of: | |
297 | * time[qualifier] | |
298 | * | |
299 | * Valid time qualifiers are: | |
300 | * <none> seconds | |
301 | * s|S seconds | |
302 | * m|M minutes | |
303 | * h|H hours | |
304 | * d|D days | |
305 | * w|W weeks | |
306 | * | |
307 | * Examples: | |
308 | * 90m 90 minutes | |
309 | * 1h30m 90 minutes | |
310 | * 2d 2 days | |
311 | * 1w 1 week | |
312 | * | |
313 | * Return -1 if time string is invalid. | |
314 | */ | |
315 | long | |
316 | convtime(const char *s) | |
317 | { | |
318 | long total, secs; | |
319 | const char *p; | |
320 | char *endp; | |
321 | ||
322 | errno = 0; | |
323 | total = 0; | |
324 | p = s; | |
325 | ||
326 | if (p == NULL || *p == '\0') | |
327 | return -1; | |
328 | ||
329 | while (*p) { | |
330 | secs = strtol(p, &endp, 10); | |
331 | if (p == endp || | |
332 | (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || | |
333 | secs < 0) | |
334 | return -1; | |
335 | ||
336 | switch (*endp++) { | |
337 | case '\0': | |
338 | endp--; | |
30460aeb | 339 | break; |
3c0ef626 | 340 | case 's': |
341 | case 'S': | |
342 | break; | |
343 | case 'm': | |
344 | case 'M': | |
345 | secs *= MINUTES; | |
346 | break; | |
347 | case 'h': | |
348 | case 'H': | |
349 | secs *= HOURS; | |
350 | break; | |
351 | case 'd': | |
352 | case 'D': | |
353 | secs *= DAYS; | |
354 | break; | |
355 | case 'w': | |
356 | case 'W': | |
357 | secs *= WEEKS; | |
358 | break; | |
359 | default: | |
360 | return -1; | |
361 | } | |
362 | total += secs; | |
363 | if (total < 0) | |
364 | return -1; | |
365 | p = endp; | |
366 | } | |
367 | ||
368 | return total; | |
369 | } | |
370 | ||
30460aeb | 371 | /* |
372 | * Returns a standardized host+port identifier string. | |
373 | * Caller must free returned string. | |
374 | */ | |
375 | char * | |
376 | put_host_port(const char *host, u_short port) | |
377 | { | |
378 | char *hoststr; | |
379 | ||
380 | if (port == 0 || port == SSH_DEFAULT_PORT) | |
381 | return(xstrdup(host)); | |
382 | if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) | |
383 | fatal("put_host_port: asprintf: %s", strerror(errno)); | |
384 | debug3("put_host_port: %s", hoststr); | |
385 | return hoststr; | |
386 | } | |
387 | ||
dfddba3d | 388 | /* |
389 | * Search for next delimiter between hostnames/addresses and ports. | |
390 | * Argument may be modified (for termination). | |
391 | * Returns *cp if parsing succeeds. | |
392 | * *cp is set to the start of the next delimiter, if one was found. | |
393 | * If this is the last field, *cp is set to NULL. | |
394 | */ | |
395 | char * | |
396 | hpdelim(char **cp) | |
397 | { | |
398 | char *s, *old; | |
399 | ||
400 | if (cp == NULL || *cp == NULL) | |
401 | return NULL; | |
402 | ||
403 | old = s = *cp; | |
404 | if (*s == '[') { | |
405 | if ((s = strchr(s, ']')) == NULL) | |
406 | return NULL; | |
407 | else | |
408 | s++; | |
409 | } else if ((s = strpbrk(s, ":/")) == NULL) | |
410 | s = *cp + strlen(*cp); /* skip to end (see first case below) */ | |
411 | ||
412 | switch (*s) { | |
413 | case '\0': | |
414 | *cp = NULL; /* no more fields*/ | |
415 | break; | |
8b32eddc | 416 | |
dfddba3d | 417 | case ':': |
418 | case '/': | |
419 | *s = '\0'; /* terminate */ | |
420 | *cp = s + 1; | |
421 | break; | |
8b32eddc | 422 | |
dfddba3d | 423 | default: |
424 | return NULL; | |
425 | } | |
426 | ||
427 | return old; | |
428 | } | |
429 | ||
3c0ef626 | 430 | char * |
431 | cleanhostname(char *host) | |
432 | { | |
433 | if (*host == '[' && host[strlen(host) - 1] == ']') { | |
434 | host[strlen(host) - 1] = '\0'; | |
435 | return (host + 1); | |
436 | } else | |
437 | return host; | |
438 | } | |
439 | ||
440 | char * | |
441 | colon(char *cp) | |
442 | { | |
443 | int flag = 0; | |
444 | ||
445 | if (*cp == ':') /* Leading colon is part of file name. */ | |
446 | return (0); | |
447 | if (*cp == '[') | |
448 | flag = 1; | |
449 | ||
450 | for (; *cp; ++cp) { | |
451 | if (*cp == '@' && *(cp+1) == '[') | |
452 | flag = 1; | |
453 | if (*cp == ']' && *(cp+1) == ':' && flag) | |
454 | return (cp+1); | |
455 | if (*cp == ':' && !flag) | |
456 | return (cp); | |
457 | if (*cp == '/') | |
458 | return (0); | |
459 | } | |
460 | return (0); | |
461 | } | |
462 | ||
463 | /* function to assist building execv() arguments */ | |
464 | void | |
465 | addargs(arglist *args, char *fmt, ...) | |
466 | { | |
467 | va_list ap; | |
08822d99 | 468 | char *cp; |
7e82606e | 469 | u_int nalloc; |
08822d99 | 470 | int r; |
3c0ef626 | 471 | |
472 | va_start(ap, fmt); | |
08822d99 | 473 | r = vasprintf(&cp, fmt, ap); |
3c0ef626 | 474 | va_end(ap); |
08822d99 | 475 | if (r == -1) |
476 | fatal("addargs: argument too long"); | |
3c0ef626 | 477 | |
29d88157 | 478 | nalloc = args->nalloc; |
3c0ef626 | 479 | if (args->list == NULL) { |
29d88157 | 480 | nalloc = 32; |
3c0ef626 | 481 | args->num = 0; |
29d88157 | 482 | } else if (args->num+2 >= nalloc) |
483 | nalloc *= 2; | |
3c0ef626 | 484 | |
30460aeb | 485 | args->list = xrealloc(args->list, nalloc, sizeof(char *)); |
29d88157 | 486 | args->nalloc = nalloc; |
08822d99 | 487 | args->list[args->num++] = cp; |
3c0ef626 | 488 | args->list[args->num] = NULL; |
489 | } | |
dfddba3d | 490 | |
08822d99 | 491 | void |
492 | replacearg(arglist *args, u_int which, char *fmt, ...) | |
493 | { | |
494 | va_list ap; | |
495 | char *cp; | |
496 | int r; | |
497 | ||
498 | va_start(ap, fmt); | |
499 | r = vasprintf(&cp, fmt, ap); | |
500 | va_end(ap); | |
501 | if (r == -1) | |
502 | fatal("replacearg: argument too long"); | |
503 | ||
504 | if (which >= args->num) | |
505 | fatal("replacearg: tried to replace invalid arg %d >= %d", | |
506 | which, args->num); | |
507 | xfree(args->list[which]); | |
508 | args->list[which] = cp; | |
509 | } | |
510 | ||
511 | void | |
512 | freeargs(arglist *args) | |
513 | { | |
514 | u_int i; | |
515 | ||
516 | if (args->list != NULL) { | |
517 | for (i = 0; i < args->num; i++) | |
518 | xfree(args->list[i]); | |
519 | xfree(args->list); | |
520 | args->nalloc = args->num = 0; | |
521 | args->list = NULL; | |
522 | } | |
523 | } | |
524 | ||
2ce0bfe4 | 525 | /* |
526 | * Expands tildes in the file name. Returns data allocated by xmalloc. | |
527 | * Warning: this calls getpw*. | |
528 | */ | |
529 | char * | |
530 | tilde_expand_filename(const char *filename, uid_t uid) | |
531 | { | |
532 | const char *path; | |
533 | char user[128], ret[MAXPATHLEN]; | |
534 | struct passwd *pw; | |
535 | u_int len, slash; | |
536 | ||
537 | if (*filename != '~') | |
538 | return (xstrdup(filename)); | |
539 | filename++; | |
540 | ||
541 | path = strchr(filename, '/'); | |
542 | if (path != NULL && path > filename) { /* ~user/path */ | |
543 | slash = path - filename; | |
544 | if (slash > sizeof(user) - 1) | |
545 | fatal("tilde_expand_filename: ~username too long"); | |
546 | memcpy(user, filename, slash); | |
547 | user[slash] = '\0'; | |
548 | if ((pw = getpwnam(user)) == NULL) | |
549 | fatal("tilde_expand_filename: No such user %s", user); | |
550 | } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ | |
5156b1a1 | 551 | fatal("tilde_expand_filename: No such uid %ld", (long)uid); |
2ce0bfe4 | 552 | |
553 | if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) | |
554 | fatal("tilde_expand_filename: Path too long"); | |
555 | ||
556 | /* Make sure directory has a trailing '/' */ | |
557 | len = strlen(pw->pw_dir); | |
558 | if ((len == 0 || pw->pw_dir[len - 1] != '/') && | |
559 | strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) | |
560 | fatal("tilde_expand_filename: Path too long"); | |
561 | ||
562 | /* Skip leading '/' from specified path */ | |
563 | if (path != NULL) | |
564 | filename = path + 1; | |
565 | if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) | |
566 | fatal("tilde_expand_filename: Path too long"); | |
567 | ||
568 | return (xstrdup(ret)); | |
569 | } | |
570 | ||
571 | /* | |
572 | * Expand a string with a set of %[char] escapes. A number of escapes may be | |
573 | * specified as (char *escape_chars, char *replacement) pairs. The list must | |
574 | * be terminated by a NULL escape_char. Returns replaced string in memory | |
575 | * allocated by xmalloc. | |
576 | */ | |
577 | char * | |
578 | percent_expand(const char *string, ...) | |
579 | { | |
580 | #define EXPAND_MAX_KEYS 16 | |
581 | struct { | |
582 | const char *key; | |
583 | const char *repl; | |
584 | } keys[EXPAND_MAX_KEYS]; | |
585 | u_int num_keys, i, j; | |
586 | char buf[4096]; | |
587 | va_list ap; | |
588 | ||
589 | /* Gather keys */ | |
590 | va_start(ap, string); | |
591 | for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { | |
592 | keys[num_keys].key = va_arg(ap, char *); | |
593 | if (keys[num_keys].key == NULL) | |
594 | break; | |
595 | keys[num_keys].repl = va_arg(ap, char *); | |
596 | if (keys[num_keys].repl == NULL) | |
597 | fatal("percent_expand: NULL replacement"); | |
598 | } | |
599 | va_end(ap); | |
600 | ||
601 | if (num_keys >= EXPAND_MAX_KEYS) | |
602 | fatal("percent_expand: too many keys"); | |
603 | ||
604 | /* Expand string */ | |
605 | *buf = '\0'; | |
606 | for (i = 0; *string != '\0'; string++) { | |
607 | if (*string != '%') { | |
608 | append: | |
609 | buf[i++] = *string; | |
610 | if (i >= sizeof(buf)) | |
611 | fatal("percent_expand: string too long"); | |
612 | buf[i] = '\0'; | |
613 | continue; | |
614 | } | |
615 | string++; | |
616 | if (*string == '%') | |
617 | goto append; | |
618 | for (j = 0; j < num_keys; j++) { | |
619 | if (strchr(keys[j].key, *string) != NULL) { | |
620 | i = strlcat(buf, keys[j].repl, sizeof(buf)); | |
621 | if (i >= sizeof(buf)) | |
622 | fatal("percent_expand: string too long"); | |
623 | break; | |
624 | } | |
625 | } | |
626 | if (j >= num_keys) | |
627 | fatal("percent_expand: unknown key %%%c", *string); | |
628 | } | |
629 | return (xstrdup(buf)); | |
630 | #undef EXPAND_MAX_KEYS | |
631 | } | |
632 | ||
dfddba3d | 633 | /* |
634 | * Read an entire line from a public key file into a static buffer, discarding | |
635 | * lines that exceed the buffer size. Returns 0 on success, -1 on failure. | |
636 | */ | |
637 | int | |
638 | read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, | |
639 | u_long *lineno) | |
640 | { | |
641 | while (fgets(buf, bufsz, f) != NULL) { | |
0b90ac93 | 642 | if (buf[0] == '\0') |
643 | continue; | |
dfddba3d | 644 | (*lineno)++; |
645 | if (buf[strlen(buf) - 1] == '\n' || feof(f)) { | |
646 | return 0; | |
647 | } else { | |
648 | debug("%s: %s line %lu exceeds size limit", __func__, | |
649 | filename, *lineno); | |
650 | /* discard remainder of line */ | |
8b32eddc | 651 | while (fgetc(f) != '\n' && !feof(f)) |
dfddba3d | 652 | ; /* nothing */ |
653 | } | |
654 | } | |
655 | return -1; | |
656 | } | |
2ce0bfe4 | 657 | |
08822d99 | 658 | int |
659 | tun_open(int tun, int mode) | |
660 | { | |
661 | #if defined(CUSTOM_SYS_TUN_OPEN) | |
662 | return (sys_tun_open(tun, mode)); | |
663 | #elif defined(SSH_TUN_OPENBSD) | |
664 | struct ifreq ifr; | |
665 | char name[100]; | |
666 | int fd = -1, sock; | |
667 | ||
668 | /* Open the tunnel device */ | |
669 | if (tun <= SSH_TUNID_MAX) { | |
670 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
671 | fd = open(name, O_RDWR); | |
672 | } else if (tun == SSH_TUNID_ANY) { | |
673 | for (tun = 100; tun >= 0; tun--) { | |
674 | snprintf(name, sizeof(name), "/dev/tun%d", tun); | |
675 | if ((fd = open(name, O_RDWR)) >= 0) | |
676 | break; | |
677 | } | |
678 | } else { | |
679 | debug("%s: invalid tunnel %u", __func__, tun); | |
680 | return (-1); | |
681 | } | |
682 | ||
683 | if (fd < 0) { | |
684 | debug("%s: %s open failed: %s", __func__, name, strerror(errno)); | |
685 | return (-1); | |
686 | } | |
687 | ||
688 | debug("%s: %s mode %d fd %d", __func__, name, mode, fd); | |
689 | ||
690 | /* Set the tunnel device operation mode */ | |
691 | snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); | |
692 | if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) | |
693 | goto failed; | |
694 | ||
695 | if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) | |
696 | goto failed; | |
697 | ||
698 | /* Set interface mode */ | |
699 | ifr.ifr_flags &= ~IFF_UP; | |
700 | if (mode == SSH_TUNMODE_ETHERNET) | |
701 | ifr.ifr_flags |= IFF_LINK0; | |
702 | else | |
703 | ifr.ifr_flags &= ~IFF_LINK0; | |
704 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
705 | goto failed; | |
706 | ||
707 | /* Bring interface up */ | |
708 | ifr.ifr_flags |= IFF_UP; | |
709 | if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) | |
710 | goto failed; | |
711 | ||
712 | close(sock); | |
713 | return (fd); | |
714 | ||
715 | failed: | |
716 | if (fd >= 0) | |
717 | close(fd); | |
718 | if (sock >= 0) | |
719 | close(sock); | |
720 | debug("%s: failed to set %s mode %d: %s", __func__, name, | |
721 | mode, strerror(errno)); | |
722 | return (-1); | |
723 | #else | |
724 | error("Tunnel interfaces are not supported on this platform"); | |
725 | return (-1); | |
726 | #endif | |
727 | } | |
728 | ||
729 | void | |
730 | sanitise_stdfd(void) | |
731 | { | |
732 | int nullfd, dupfd; | |
733 | ||
734 | if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { | |
5262cbfb | 735 | fprintf(stderr, "Couldn't open /dev/null: %s\n", |
736 | strerror(errno)); | |
08822d99 | 737 | exit(1); |
738 | } | |
739 | while (++dupfd <= 2) { | |
740 | /* Only clobber closed fds */ | |
741 | if (fcntl(dupfd, F_GETFL, 0) >= 0) | |
742 | continue; | |
743 | if (dup2(nullfd, dupfd) == -1) { | |
5262cbfb | 744 | fprintf(stderr, "dup2: %s\n", strerror(errno)); |
08822d99 | 745 | exit(1); |
746 | } | |
747 | } | |
748 | if (nullfd > 2) | |
749 | close(nullfd); | |
750 | } | |
751 | ||
2ce0bfe4 | 752 | char * |
30460aeb | 753 | tohex(const void *vp, size_t l) |
2ce0bfe4 | 754 | { |
30460aeb | 755 | const u_char *p = (const u_char *)vp; |
2ce0bfe4 | 756 | char b[3], *r; |
30460aeb | 757 | size_t i, hl; |
758 | ||
759 | if (l > 65536) | |
760 | return xstrdup("tohex: length > 65536"); | |
2ce0bfe4 | 761 | |
762 | hl = l * 2 + 1; | |
30460aeb | 763 | r = xcalloc(1, hl); |
2ce0bfe4 | 764 | for (i = 0; i < l; i++) { |
30460aeb | 765 | snprintf(b, sizeof(b), "%02x", p[i]); |
2ce0bfe4 | 766 | strlcat(r, b, hl); |
767 | } | |
768 | return (r); | |
769 | } | |
770 | ||
30460aeb | 771 | u_int64_t |
772 | get_u64(const void *vp) | |
773 | { | |
774 | const u_char *p = (const u_char *)vp; | |
775 | u_int64_t v; | |
776 | ||
777 | v = (u_int64_t)p[0] << 56; | |
778 | v |= (u_int64_t)p[1] << 48; | |
779 | v |= (u_int64_t)p[2] << 40; | |
780 | v |= (u_int64_t)p[3] << 32; | |
781 | v |= (u_int64_t)p[4] << 24; | |
782 | v |= (u_int64_t)p[5] << 16; | |
783 | v |= (u_int64_t)p[6] << 8; | |
784 | v |= (u_int64_t)p[7]; | |
785 | ||
786 | return (v); | |
787 | } | |
788 | ||
789 | u_int32_t | |
790 | get_u32(const void *vp) | |
791 | { | |
792 | const u_char *p = (const u_char *)vp; | |
793 | u_int32_t v; | |
794 | ||
795 | v = (u_int32_t)p[0] << 24; | |
796 | v |= (u_int32_t)p[1] << 16; | |
797 | v |= (u_int32_t)p[2] << 8; | |
798 | v |= (u_int32_t)p[3]; | |
799 | ||
800 | return (v); | |
801 | } | |
802 | ||
803 | u_int16_t | |
804 | get_u16(const void *vp) | |
805 | { | |
806 | const u_char *p = (const u_char *)vp; | |
807 | u_int16_t v; | |
808 | ||
809 | v = (u_int16_t)p[0] << 8; | |
810 | v |= (u_int16_t)p[1]; | |
811 | ||
812 | return (v); | |
813 | } | |
814 | ||
815 | void | |
816 | put_u64(void *vp, u_int64_t v) | |
817 | { | |
818 | u_char *p = (u_char *)vp; | |
819 | ||
820 | p[0] = (u_char)(v >> 56) & 0xff; | |
821 | p[1] = (u_char)(v >> 48) & 0xff; | |
822 | p[2] = (u_char)(v >> 40) & 0xff; | |
823 | p[3] = (u_char)(v >> 32) & 0xff; | |
824 | p[4] = (u_char)(v >> 24) & 0xff; | |
825 | p[5] = (u_char)(v >> 16) & 0xff; | |
826 | p[6] = (u_char)(v >> 8) & 0xff; | |
827 | p[7] = (u_char)v & 0xff; | |
828 | } | |
829 | ||
830 | void | |
831 | put_u32(void *vp, u_int32_t v) | |
832 | { | |
833 | u_char *p = (u_char *)vp; | |
834 | ||
835 | p[0] = (u_char)(v >> 24) & 0xff; | |
836 | p[1] = (u_char)(v >> 16) & 0xff; | |
837 | p[2] = (u_char)(v >> 8) & 0xff; | |
838 | p[3] = (u_char)v & 0xff; | |
839 | } | |
840 | ||
841 | ||
842 | void | |
843 | put_u16(void *vp, u_int16_t v) | |
844 | { | |
845 | u_char *p = (u_char *)vp; | |
846 | ||
847 | p[0] = (u_char)(v >> 8) & 0xff; | |
848 | p[1] = (u_char)v & 0xff; | |
849 | } | |
5156b1a1 | 850 | |
851 | void | |
852 | ms_subtract_diff(struct timeval *start, int *ms) | |
853 | { | |
854 | struct timeval diff, finish; | |
855 | ||
856 | gettimeofday(&finish, NULL); | |
857 | timersub(&finish, start, &diff); | |
858 | *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); | |
859 | } | |
860 | ||
861 | void | |
862 | ms_to_timeval(struct timeval *tv, int ms) | |
863 | { | |
864 | if (ms < 0) | |
865 | ms = 0; | |
866 | tv->tv_sec = ms / 1000; | |
867 | tv->tv_usec = (ms % 1000) * 1000; | |
868 | } | |
869 |