blob: 66b762b5a06f7ffa82fa4ca99096dfded5db02ca [file] [log] [blame]
Damien Millere4340be2000-09-16 13:29:08 +11001/*
2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
Damien Miller6476cad2005-06-16 13:18:34 +10003 * Copyright (c) 2005 Damien Miller. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +11004 *
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
Damien Miller61c51502000-08-18 14:01:04 +100026#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110027
28#include <sys/ioctl.h>
Damien Miller3a4051e2006-03-15 11:19:42 +110029#include <netinet/tcp.h>
Damien Miller03e20032006-03-15 11:16:59 +110030#ifdef HAVE_PATHS_H
Damien Millera9263d02006-03-15 11:18:26 +110031# include <paths.h>
Damien Miller03e20032006-03-15 11:16:59 +110032#endif
Damien Miller3beb8522006-01-02 23:40:10 +110033#ifdef SSH_TUN_OPENBSD
34#include <net/if.h>
35#endif
Damien Miller61c51502000-08-18 14:01:04 +100036
Kevin Stevesb6e773a2001-02-04 13:20:36 +000037#include "misc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000038#include "log.h"
Ben Lindstrom06909012001-03-05 06:09:31 +000039#include "xmalloc.h"
Damien Miller61c51502000-08-18 14:01:04 +100040
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000041/* remove newline at end of string */
Damien Miller61c51502000-08-18 14:01:04 +100042char *
43chop(char *s)
44{
45 char *t = s;
46 while (*t) {
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +000047 if (*t == '\n' || *t == '\r') {
Damien Miller61c51502000-08-18 14:01:04 +100048 *t = '\0';
49 return s;
50 }
51 t++;
52 }
53 return s;
54
55}
56
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000057/* set/unset filedescriptor to non-blocking */
Damien Miller232711f2004-06-15 10:35:30 +100058int
Damien Miller61c51502000-08-18 14:01:04 +100059set_nonblock(int fd)
60{
61 int val;
Ben Lindstromc93e84c2001-05-12 00:08:37 +000062
Damien Miller61c51502000-08-18 14:01:04 +100063 val = fcntl(fd, F_GETFL, 0);
64 if (val < 0) {
65 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
Damien Miller232711f2004-06-15 10:35:30 +100066 return (-1);
Damien Miller61c51502000-08-18 14:01:04 +100067 }
Damien Miller69b69aa2000-10-28 14:19:58 +110068 if (val & O_NONBLOCK) {
Damien Miller232711f2004-06-15 10:35:30 +100069 debug3("fd %d is O_NONBLOCK", fd);
70 return (0);
Damien Miller69b69aa2000-10-28 14:19:58 +110071 }
Damien Milleref095ce2003-05-14 13:41:39 +100072 debug2("fd %d setting O_NONBLOCK", fd);
Damien Miller61c51502000-08-18 14:01:04 +100073 val |= O_NONBLOCK;
Damien Miller232711f2004-06-15 10:35:30 +100074 if (fcntl(fd, F_SETFL, val) == -1) {
75 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
76 strerror(errno));
77 return (-1);
78 }
79 return (0);
Damien Miller61c51502000-08-18 14:01:04 +100080}
81
Damien Miller232711f2004-06-15 10:35:30 +100082int
Ben Lindstromc93e84c2001-05-12 00:08:37 +000083unset_nonblock(int fd)
84{
85 int val;
86
87 val = fcntl(fd, F_GETFL, 0);
88 if (val < 0) {
89 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
Damien Miller232711f2004-06-15 10:35:30 +100090 return (-1);
Ben Lindstromc93e84c2001-05-12 00:08:37 +000091 }
92 if (!(val & O_NONBLOCK)) {
Damien Miller232711f2004-06-15 10:35:30 +100093 debug3("fd %d is not O_NONBLOCK", fd);
94 return (0);
Ben Lindstromc93e84c2001-05-12 00:08:37 +000095 }
Ben Lindstrom352b1c22001-06-21 03:04:37 +000096 debug("fd %d clearing O_NONBLOCK", fd);
Ben Lindstromc93e84c2001-05-12 00:08:37 +000097 val &= ~O_NONBLOCK;
Damien Miller232711f2004-06-15 10:35:30 +100098 if (fcntl(fd, F_SETFL, val) == -1) {
99 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
Ben Lindstrom84fcb312002-03-05 01:48:09 +0000100 fd, strerror(errno));
Damien Miller232711f2004-06-15 10:35:30 +1000101 return (-1);
102 }
103 return (0);
Ben Lindstromc93e84c2001-05-12 00:08:37 +0000104}
105
Damien Miller398e1cf2002-02-05 11:52:13 +1100106/* disable nagle on socket */
107void
108set_nodelay(int fd)
109{
Ben Lindstrome86de512002-03-05 01:28:14 +0000110 int opt;
111 socklen_t optlen;
Damien Miller398e1cf2002-02-05 11:52:13 +1100112
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +0000113 optlen = sizeof opt;
114 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
Darren Tucker6db8f932003-11-03 20:07:14 +1100115 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +0000116 return;
117 }
118 if (opt == 1) {
119 debug2("fd %d is TCP_NODELAY", fd);
120 return;
121 }
122 opt = 1;
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000123 debug2("fd %d setting TCP_NODELAY", fd);
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +0000124 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
Damien Miller398e1cf2002-02-05 11:52:13 +1100125 error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
126}
127
Damien Miller61c51502000-08-18 14:01:04 +1000128/* Characters considered whitespace in strsep calls. */
129#define WHITESPACE " \t\r\n"
Damien Miller306d1182006-03-15 12:05:59 +1100130#define QUOTE "\""
Damien Miller61c51502000-08-18 14:01:04 +1000131
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000132/* return next token in configuration line */
Damien Miller61c51502000-08-18 14:01:04 +1000133char *
134strdelim(char **s)
135{
136 char *old;
137 int wspace = 0;
138
139 if (*s == NULL)
140 return NULL;
141
142 old = *s;
143
Damien Miller306d1182006-03-15 12:05:59 +1100144 *s = strpbrk(*s, WHITESPACE QUOTE "=");
Damien Miller61c51502000-08-18 14:01:04 +1000145 if (*s == NULL)
146 return (old);
147
Damien Miller306d1182006-03-15 12:05:59 +1100148 if (*s[0] == '\"') {
149 memmove(*s, *s + 1, strlen(*s)); /* move nul too */
150 /* Find matching quote */
151 if ((*s = strpbrk(*s, QUOTE)) == NULL) {
152 return (NULL); /* no matching quote */
153 } else {
154 *s[0] = '\0';
155 return (old);
156 }
157 }
158
Damien Miller61c51502000-08-18 14:01:04 +1000159 /* Allow only one '=' to be skipped */
160 if (*s[0] == '=')
161 wspace = 1;
162 *s[0] = '\0';
163
Damien Miller306d1182006-03-15 12:05:59 +1100164 /* Skip any extra whitespace after first token */
Damien Miller61c51502000-08-18 14:01:04 +1000165 *s += strspn(*s + 1, WHITESPACE) + 1;
166 if (*s[0] == '=' && !wspace)
167 *s += strspn(*s + 1, WHITESPACE) + 1;
168
169 return (old);
170}
Kevin Stevesb6e773a2001-02-04 13:20:36 +0000171
Ben Lindstrom086cf212001-03-05 05:56:40 +0000172struct passwd *
173pwcopy(struct passwd *pw)
174{
175 struct passwd *copy = xmalloc(sizeof(*copy));
Ben Lindstrom40304422001-03-05 06:22:01 +0000176
Ben Lindstrom086cf212001-03-05 05:56:40 +0000177 memset(copy, 0, sizeof(*copy));
178 copy->pw_name = xstrdup(pw->pw_name);
179 copy->pw_passwd = xstrdup(pw->pw_passwd);
Ben Lindstrom40304422001-03-05 06:22:01 +0000180 copy->pw_gecos = xstrdup(pw->pw_gecos);
Ben Lindstrom086cf212001-03-05 05:56:40 +0000181 copy->pw_uid = pw->pw_uid;
182 copy->pw_gid = pw->pw_gid;
Kevin Steves82456952001-06-22 21:14:18 +0000183#ifdef HAVE_PW_EXPIRE_IN_PASSWD
Ben Lindstrom3af4d462001-06-21 03:11:27 +0000184 copy->pw_expire = pw->pw_expire;
Kevin Steves82456952001-06-22 21:14:18 +0000185#endif
186#ifdef HAVE_PW_CHANGE_IN_PASSWD
Ben Lindstrom3af4d462001-06-21 03:11:27 +0000187 copy->pw_change = pw->pw_change;
Kevin Steves82456952001-06-22 21:14:18 +0000188#endif
Ben Lindstrom0f68db42001-03-05 07:57:09 +0000189#ifdef HAVE_PW_CLASS_IN_PASSWD
Ben Lindstrom086cf212001-03-05 05:56:40 +0000190 copy->pw_class = xstrdup(pw->pw_class);
Ben Lindstrom0f68db42001-03-05 07:57:09 +0000191#endif
Ben Lindstrom086cf212001-03-05 05:56:40 +0000192 copy->pw_dir = xstrdup(pw->pw_dir);
193 copy->pw_shell = xstrdup(pw->pw_shell);
194 return copy;
195}
196
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000197/*
198 * Convert ASCII string to TCP/IP port number.
199 * Port must be >0 and <=65535.
200 * Return 0 if invalid.
201 */
202int
203a2port(const char *s)
Ben Lindstrom19066a12001-04-12 23:39:26 +0000204{
205 long port;
206 char *endp;
207
208 errno = 0;
209 port = strtol(s, &endp, 0);
210 if (s == endp || *endp != '\0' ||
211 (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
212 port <= 0 || port > 65535)
213 return 0;
214
215 return port;
216}
217
Damien Millerd27b9472005-12-13 19:29:02 +1100218int
219a2tun(const char *s, int *remote)
220{
221 const char *errstr = NULL;
222 char *sp, *ep;
223 int tun;
224
225 if (remote != NULL) {
Damien Miller7b58e802005-12-13 19:33:19 +1100226 *remote = SSH_TUNID_ANY;
Damien Millerd27b9472005-12-13 19:29:02 +1100227 sp = xstrdup(s);
228 if ((ep = strchr(sp, ':')) == NULL) {
229 xfree(sp);
230 return (a2tun(s, NULL));
231 }
232 ep[0] = '\0'; ep++;
233 *remote = a2tun(ep, NULL);
234 tun = a2tun(sp, NULL);
235 xfree(sp);
Damien Miller7b58e802005-12-13 19:33:19 +1100236 return (*remote == SSH_TUNID_ERR ? *remote : tun);
Damien Millerd27b9472005-12-13 19:29:02 +1100237 }
238
239 if (strcasecmp(s, "any") == 0)
Damien Miller7b58e802005-12-13 19:33:19 +1100240 return (SSH_TUNID_ANY);
Damien Millerd27b9472005-12-13 19:29:02 +1100241
Damien Miller7b58e802005-12-13 19:33:19 +1100242 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
243 if (errstr != NULL)
244 return (SSH_TUNID_ERR);
Damien Millerd27b9472005-12-13 19:29:02 +1100245
246 return (tun);
247}
248
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000249#define SECONDS 1
250#define MINUTES (SECONDS * 60)
251#define HOURS (MINUTES * 60)
252#define DAYS (HOURS * 24)
253#define WEEKS (DAYS * 7)
254
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000255/*
256 * Convert a time string into seconds; format is
257 * a sequence of:
258 * time[qualifier]
259 *
260 * Valid time qualifiers are:
261 * <none> seconds
262 * s|S seconds
263 * m|M minutes
264 * h|H hours
265 * d|D days
266 * w|W weeks
267 *
268 * Examples:
269 * 90m 90 minutes
270 * 1h30m 90 minutes
271 * 2d 2 days
272 * 1w 1 week
273 *
274 * Return -1 if time string is invalid.
275 */
276long
277convtime(const char *s)
Ben Lindstrom1bda4c82001-06-05 19:59:08 +0000278{
279 long total, secs;
280 const char *p;
281 char *endp;
282
283 errno = 0;
284 total = 0;
285 p = s;
286
287 if (p == NULL || *p == '\0')
288 return -1;
289
290 while (*p) {
291 secs = strtol(p, &endp, 10);
292 if (p == endp ||
293 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
294 secs < 0)
295 return -1;
296
297 switch (*endp++) {
298 case '\0':
299 endp--;
300 case 's':
301 case 'S':
302 break;
303 case 'm':
304 case 'M':
305 secs *= MINUTES;
306 break;
307 case 'h':
308 case 'H':
309 secs *= HOURS;
310 break;
311 case 'd':
312 case 'D':
313 secs *= DAYS;
314 break;
315 case 'w':
316 case 'W':
317 secs *= WEEKS;
318 break;
319 default:
320 return -1;
321 }
322 total += secs;
323 if (total < 0)
324 return -1;
325 p = endp;
326 }
327
328 return total;
329}
330
Damien Millerf91ee4c2005-03-01 21:24:33 +1100331/*
332 * Search for next delimiter between hostnames/addresses and ports.
333 * Argument may be modified (for termination).
334 * Returns *cp if parsing succeeds.
335 * *cp is set to the start of the next delimiter, if one was found.
336 * If this is the last field, *cp is set to NULL.
337 */
338char *
339hpdelim(char **cp)
340{
341 char *s, *old;
342
343 if (cp == NULL || *cp == NULL)
344 return NULL;
345
346 old = s = *cp;
347 if (*s == '[') {
348 if ((s = strchr(s, ']')) == NULL)
349 return NULL;
350 else
351 s++;
352 } else if ((s = strpbrk(s, ":/")) == NULL)
353 s = *cp + strlen(*cp); /* skip to end (see first case below) */
354
355 switch (*s) {
356 case '\0':
357 *cp = NULL; /* no more fields*/
358 break;
Darren Tucker47eede72005-03-14 23:08:12 +1100359
Damien Millerf91ee4c2005-03-01 21:24:33 +1100360 case ':':
361 case '/':
362 *s = '\0'; /* terminate */
363 *cp = s + 1;
364 break;
Darren Tucker47eede72005-03-14 23:08:12 +1100365
Damien Millerf91ee4c2005-03-01 21:24:33 +1100366 default:
367 return NULL;
368 }
369
370 return old;
371}
372
Ben Lindstrom4529b702001-05-03 23:39:53 +0000373char *
374cleanhostname(char *host)
375{
376 if (*host == '[' && host[strlen(host) - 1] == ']') {
377 host[strlen(host) - 1] = '\0';
378 return (host + 1);
379 } else
380 return host;
381}
382
383char *
384colon(char *cp)
385{
386 int flag = 0;
387
388 if (*cp == ':') /* Leading colon is part of file name. */
389 return (0);
390 if (*cp == '[')
391 flag = 1;
392
393 for (; *cp; ++cp) {
394 if (*cp == '@' && *(cp+1) == '[')
395 flag = 1;
396 if (*cp == ']' && *(cp+1) == ':' && flag)
397 return (cp+1);
398 if (*cp == ':' && !flag)
399 return (cp);
400 if (*cp == '/')
401 return (0);
402 }
403 return (0);
404}
405
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000406/* function to assist building execv() arguments */
Ben Lindstrom387c4722001-05-08 20:27:25 +0000407void
408addargs(arglist *args, char *fmt, ...)
409{
410 va_list ap;
Damien Miller3eec6b72006-01-31 21:49:27 +1100411 char *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000412 u_int nalloc;
Damien Miller3eec6b72006-01-31 21:49:27 +1100413 int r;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000414
415 va_start(ap, fmt);
Damien Miller3eec6b72006-01-31 21:49:27 +1100416 r = vasprintf(&cp, fmt, ap);
Ben Lindstrom387c4722001-05-08 20:27:25 +0000417 va_end(ap);
Damien Miller3eec6b72006-01-31 21:49:27 +1100418 if (r == -1)
419 fatal("addargs: argument too long");
Ben Lindstrom387c4722001-05-08 20:27:25 +0000420
Darren Tuckerfb16b242003-09-22 21:04:23 +1000421 nalloc = args->nalloc;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000422 if (args->list == NULL) {
Darren Tuckerfb16b242003-09-22 21:04:23 +1000423 nalloc = 32;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000424 args->num = 0;
Darren Tuckerfb16b242003-09-22 21:04:23 +1000425 } else if (args->num+2 >= nalloc)
426 nalloc *= 2;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000427
Darren Tuckerfb16b242003-09-22 21:04:23 +1000428 args->list = xrealloc(args->list, nalloc * sizeof(char *));
429 args->nalloc = nalloc;
Damien Miller3eec6b72006-01-31 21:49:27 +1100430 args->list[args->num++] = cp;
Ben Lindstrom387c4722001-05-08 20:27:25 +0000431 args->list[args->num] = NULL;
432}
Darren Tucker22cc7412004-12-06 22:47:41 +1100433
Damien Miller3eec6b72006-01-31 21:49:27 +1100434void
435replacearg(arglist *args, u_int which, char *fmt, ...)
436{
437 va_list ap;
438 char *cp;
439 int r;
440
441 va_start(ap, fmt);
442 r = vasprintf(&cp, fmt, ap);
443 va_end(ap);
444 if (r == -1)
445 fatal("replacearg: argument too long");
446
447 if (which >= args->num)
448 fatal("replacearg: tried to replace invalid arg %d >= %d",
449 which, args->num);
450 xfree(args->list[which]);
451 args->list[which] = cp;
452}
453
454void
455freeargs(arglist *args)
456{
457 u_int i;
458
459 if (args->list != NULL) {
460 for (i = 0; i < args->num; i++)
461 xfree(args->list[i]);
462 xfree(args->list);
463 args->nalloc = args->num = 0;
464 args->list = NULL;
465 }
466}
467
Darren Tucker22cc7412004-12-06 22:47:41 +1100468/*
Damien Miller5fd38c02005-05-26 12:02:14 +1000469 * Expands tildes in the file name. Returns data allocated by xmalloc.
470 * Warning: this calls getpw*.
471 */
472char *
473tilde_expand_filename(const char *filename, uid_t uid)
474{
475 const char *path;
476 char user[128], ret[MAXPATHLEN];
477 struct passwd *pw;
Damien Millereccb9de2005-06-17 12:59:34 +1000478 u_int len, slash;
Damien Miller5fd38c02005-05-26 12:02:14 +1000479
480 if (*filename != '~')
481 return (xstrdup(filename));
482 filename++;
483
484 path = strchr(filename, '/');
485 if (path != NULL && path > filename) { /* ~user/path */
Damien Millereccb9de2005-06-17 12:59:34 +1000486 slash = path - filename;
487 if (slash > sizeof(user) - 1)
Damien Miller5fd38c02005-05-26 12:02:14 +1000488 fatal("tilde_expand_filename: ~username too long");
Damien Millereccb9de2005-06-17 12:59:34 +1000489 memcpy(user, filename, slash);
490 user[slash] = '\0';
Damien Miller5fd38c02005-05-26 12:02:14 +1000491 if ((pw = getpwnam(user)) == NULL)
492 fatal("tilde_expand_filename: No such user %s", user);
493 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
494 fatal("tilde_expand_filename: No such uid %d", uid);
495
496 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
497 fatal("tilde_expand_filename: Path too long");
498
499 /* Make sure directory has a trailing '/' */
500 len = strlen(pw->pw_dir);
501 if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
502 strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
503 fatal("tilde_expand_filename: Path too long");
504
505 /* Skip leading '/' from specified path */
506 if (path != NULL)
507 filename = path + 1;
508 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
509 fatal("tilde_expand_filename: Path too long");
510
511 return (xstrdup(ret));
512}
513
514/*
Damien Miller6476cad2005-06-16 13:18:34 +1000515 * Expand a string with a set of %[char] escapes. A number of escapes may be
516 * specified as (char *escape_chars, char *replacement) pairs. The list must
Darren Tuckerbee73d52005-07-14 17:05:02 +1000517 * be terminated by a NULL escape_char. Returns replaced string in memory
Damien Miller6476cad2005-06-16 13:18:34 +1000518 * allocated by xmalloc.
519 */
520char *
521percent_expand(const char *string, ...)
522{
523#define EXPAND_MAX_KEYS 16
524 struct {
525 const char *key;
526 const char *repl;
527 } keys[EXPAND_MAX_KEYS];
Damien Millereccb9de2005-06-17 12:59:34 +1000528 u_int num_keys, i, j;
Damien Miller6476cad2005-06-16 13:18:34 +1000529 char buf[4096];
530 va_list ap;
531
532 /* Gather keys */
533 va_start(ap, string);
534 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
535 keys[num_keys].key = va_arg(ap, char *);
536 if (keys[num_keys].key == NULL)
537 break;
538 keys[num_keys].repl = va_arg(ap, char *);
539 if (keys[num_keys].repl == NULL)
540 fatal("percent_expand: NULL replacement");
541 }
542 va_end(ap);
543
544 if (num_keys >= EXPAND_MAX_KEYS)
545 fatal("percent_expand: too many keys");
546
547 /* Expand string */
548 *buf = '\0';
549 for (i = 0; *string != '\0'; string++) {
550 if (*string != '%') {
551 append:
552 buf[i++] = *string;
553 if (i >= sizeof(buf))
554 fatal("percent_expand: string too long");
555 buf[i] = '\0';
556 continue;
557 }
558 string++;
559 if (*string == '%')
560 goto append;
561 for (j = 0; j < num_keys; j++) {
562 if (strchr(keys[j].key, *string) != NULL) {
563 i = strlcat(buf, keys[j].repl, sizeof(buf));
564 if (i >= sizeof(buf))
565 fatal("percent_expand: string too long");
566 break;
567 }
568 }
569 if (j >= num_keys)
570 fatal("percent_expand: unknown key %%%c", *string);
571 }
572 return (xstrdup(buf));
573#undef EXPAND_MAX_KEYS
574}
575
576/*
Darren Tucker22cc7412004-12-06 22:47:41 +1100577 * Read an entire line from a public key file into a static buffer, discarding
578 * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
579 */
580int
581read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
Darren Tuckerf0f90982004-12-11 13:39:50 +1100582 u_long *lineno)
Darren Tucker22cc7412004-12-06 22:47:41 +1100583{
584 while (fgets(buf, bufsz, f) != NULL) {
585 (*lineno)++;
586 if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
587 return 0;
588 } else {
Darren Tuckerf0f90982004-12-11 13:39:50 +1100589 debug("%s: %s line %lu exceeds size limit", __func__,
590 filename, *lineno);
Darren Tucker22cc7412004-12-06 22:47:41 +1100591 /* discard remainder of line */
Darren Tucker47eede72005-03-14 23:08:12 +1100592 while (fgetc(f) != '\n' && !feof(f))
Darren Tucker22cc7412004-12-06 22:47:41 +1100593 ; /* nothing */
594 }
595 }
596 return -1;
597}
Damien Miller13390022005-07-06 09:44:19 +1000598
Damien Millerd27b9472005-12-13 19:29:02 +1100599int
Damien Miller7b58e802005-12-13 19:33:19 +1100600tun_open(int tun, int mode)
Damien Millerd27b9472005-12-13 19:29:02 +1100601{
Damien Miller62a31c92005-12-13 20:44:13 +1100602#if defined(CUSTOM_SYS_TUN_OPEN)
603 return (sys_tun_open(tun, mode));
Damien Miller2dcddbf2006-01-01 19:47:05 +1100604#elif defined(SSH_TUN_OPENBSD)
Damien Miller7b58e802005-12-13 19:33:19 +1100605 struct ifreq ifr;
Damien Millerd27b9472005-12-13 19:29:02 +1100606 char name[100];
Damien Miller7b58e802005-12-13 19:33:19 +1100607 int fd = -1, sock;
Damien Millerd27b9472005-12-13 19:29:02 +1100608
Damien Miller7b58e802005-12-13 19:33:19 +1100609 /* Open the tunnel device */
610 if (tun <= SSH_TUNID_MAX) {
Damien Millerd27b9472005-12-13 19:29:02 +1100611 snprintf(name, sizeof(name), "/dev/tun%d", tun);
Damien Miller7b58e802005-12-13 19:33:19 +1100612 fd = open(name, O_RDWR);
613 } else if (tun == SSH_TUNID_ANY) {
614 for (tun = 100; tun >= 0; tun--) {
615 snprintf(name, sizeof(name), "/dev/tun%d", tun);
616 if ((fd = open(name, O_RDWR)) >= 0)
617 break;
Damien Millerd27b9472005-12-13 19:29:02 +1100618 }
619 } else {
Damien Millera210d522006-01-02 23:40:30 +1100620 debug("%s: invalid tunnel %u", __func__, tun);
Damien Miller7b58e802005-12-13 19:33:19 +1100621 return (-1);
Damien Millerd27b9472005-12-13 19:29:02 +1100622 }
Damien Miller7b58e802005-12-13 19:33:19 +1100623
624 if (fd < 0) {
625 debug("%s: %s open failed: %s", __func__, name, strerror(errno));
626 return (-1);
627 }
628
629 debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
630
631 /* Set the tunnel device operation mode */
632 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
633 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
634 goto failed;
635
636 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
637 goto failed;
Damien Millera1d9a182006-01-02 23:41:21 +1100638
639 /* Set interface mode */
640 ifr.ifr_flags &= ~IFF_UP;
641 if (mode == SSH_TUNMODE_ETHERNET)
Damien Miller7b58e802005-12-13 19:33:19 +1100642 ifr.ifr_flags |= IFF_LINK0;
Damien Millera1d9a182006-01-02 23:41:21 +1100643 else
644 ifr.ifr_flags &= ~IFF_LINK0;
645 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
646 goto failed;
647
648 /* Bring interface up */
Damien Miller7b58e802005-12-13 19:33:19 +1100649 ifr.ifr_flags |= IFF_UP;
650 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
651 goto failed;
652
653 close(sock);
654 return (fd);
655
656 failed:
657 if (fd >= 0)
658 close(fd);
659 if (sock >= 0)
660 close(sock);
661 debug("%s: failed to set %s mode %d: %s", __func__, name,
662 mode, strerror(errno));
Damien Millerd27b9472005-12-13 19:29:02 +1100663 return (-1);
Damien Miller62a31c92005-12-13 20:44:13 +1100664#else
665 error("Tunnel interfaces are not supported on this platform");
666 return (-1);
667#endif
Damien Millerd27b9472005-12-13 19:29:02 +1100668}
669
Darren Tuckerce321d82005-10-03 18:11:24 +1000670void
671sanitise_stdfd(void)
672{
Damien Miller72c5b7d2006-01-06 14:50:44 +1100673 int nullfd, dupfd;
Darren Tuckerce321d82005-10-03 18:11:24 +1000674
Damien Miller72c5b7d2006-01-06 14:50:44 +1100675 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
Darren Tuckerce321d82005-10-03 18:11:24 +1000676 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
677 exit(1);
678 }
Damien Miller72c5b7d2006-01-06 14:50:44 +1100679 while (++dupfd <= 2) {
680 /* Only clobber closed fds */
681 if (fcntl(dupfd, F_GETFL, 0) >= 0)
682 continue;
683 if (dup2(nullfd, dupfd) == -1) {
Darren Tuckerce321d82005-10-03 18:11:24 +1000684 fprintf(stderr, "dup2: %s", strerror(errno));
685 exit(1);
686 }
Darren Tuckerce321d82005-10-03 18:11:24 +1000687 }
688 if (nullfd > 2)
689 close(nullfd);
690}
691
Damien Miller13390022005-07-06 09:44:19 +1000692char *
693tohex(const u_char *d, u_int l)
694{
695 char b[3], *r;
696 u_int i, hl;
697
698 hl = l * 2 + 1;
699 r = xmalloc(hl);
700 *r = '\0';
701 for (i = 0; i < l; i++) {
702 snprintf(b, sizeof(b), "%02x", d[i]);
703 strlcat(r, b, hl);
704 }
705 return (r);
706}
707