2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
3 * Copyright (c) 2005 Damien Miller. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
27 RCSID("$OpenBSD: misc.c,v 1.42 2006/01/31 10:19:02 djm Exp $");
29 #ifdef SSH_TUN_OPENBSD
37 /* remove newline at end of string */
43 if (*t == '\n' || *t == '\r') {
53 /* set/unset filedescriptor to non-blocking */
59 val = fcntl(fd, F_GETFL, 0);
61 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
64 if (val & O_NONBLOCK) {
65 debug3("fd %d is O_NONBLOCK", fd);
68 debug2("fd %d setting O_NONBLOCK", fd);
70 if (fcntl(fd, F_SETFL, val) == -1) {
71 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
79 unset_nonblock(int fd)
83 val = fcntl(fd, F_GETFL, 0);
85 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
88 if (!(val & O_NONBLOCK)) {
89 debug3("fd %d is not O_NONBLOCK", fd);
92 debug("fd %d clearing O_NONBLOCK", fd);
94 if (fcntl(fd, F_SETFL, val) == -1) {
95 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
102 /* disable nagle on socket */
110 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
111 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
115 debug2("fd %d is TCP_NODELAY", fd);
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));
124 /* Characters considered whitespace in strsep calls. */
125 #define WHITESPACE " \t\r\n"
127 /* return next token in configuration line */
139 *s = strpbrk(*s, WHITESPACE "=");
143 /* Allow only one '=' to be skipped */
148 *s += strspn(*s + 1, WHITESPACE) + 1;
149 if (*s[0] == '=' && !wspace)
150 *s += strspn(*s + 1, WHITESPACE) + 1;
156 pwcopy(struct passwd *pw)
158 struct passwd *copy = xmalloc(sizeof(*copy));
160 memset(copy, 0, sizeof(*copy));
161 copy->pw_name = xstrdup(pw->pw_name);
162 copy->pw_passwd = xstrdup(pw->pw_passwd);
163 copy->pw_gecos = xstrdup(pw->pw_gecos);
164 copy->pw_uid = pw->pw_uid;
165 copy->pw_gid = pw->pw_gid;
166 #ifdef HAVE_PW_EXPIRE_IN_PASSWD
167 copy->pw_expire = pw->pw_expire;
169 #ifdef HAVE_PW_CHANGE_IN_PASSWD
170 copy->pw_change = pw->pw_change;
172 #ifdef HAVE_PW_CLASS_IN_PASSWD
173 copy->pw_class = xstrdup(pw->pw_class);
175 copy->pw_dir = xstrdup(pw->pw_dir);
176 copy->pw_shell = xstrdup(pw->pw_shell);
181 * Convert ASCII string to TCP/IP port number.
182 * Port must be >0 and <=65535.
183 * Return 0 if invalid.
186 a2port(const char *s)
192 port = strtol(s, &endp, 0);
193 if (s == endp || *endp != '\0' ||
194 (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
195 port <= 0 || port > 65535)
202 a2tun(const char *s, int *remote)
204 const char *errstr = NULL;
208 if (remote != NULL) {
209 *remote = SSH_TUNID_ANY;
211 if ((ep = strchr(sp, ':')) == NULL) {
213 return (a2tun(s, NULL));
216 *remote = a2tun(ep, NULL);
217 tun = a2tun(sp, NULL);
219 return (*remote == SSH_TUNID_ERR ? *remote : tun);
222 if (strcasecmp(s, "any") == 0)
223 return (SSH_TUNID_ANY);
225 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
227 return (SSH_TUNID_ERR);
233 #define MINUTES (SECONDS * 60)
234 #define HOURS (MINUTES * 60)
235 #define DAYS (HOURS * 24)
236 #define WEEKS (DAYS * 7)
239 * Convert a time string into seconds; format is
243 * Valid time qualifiers are:
257 * Return -1 if time string is invalid.
260 convtime(const char *s)
270 if (p == NULL || *p == '\0')
274 secs = strtol(p, &endp, 10);
276 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
315 * Search for next delimiter between hostnames/addresses and ports.
316 * Argument may be modified (for termination).
317 * Returns *cp if parsing succeeds.
318 * *cp is set to the start of the next delimiter, if one was found.
319 * If this is the last field, *cp is set to NULL.
326 if (cp == NULL || *cp == NULL)
331 if ((s = strchr(s, ']')) == NULL)
335 } else if ((s = strpbrk(s, ":/")) == NULL)
336 s = *cp + strlen(*cp); /* skip to end (see first case below) */
340 *cp = NULL; /* no more fields*/
345 *s = '\0'; /* terminate */
357 cleanhostname(char *host)
359 if (*host == '[' && host[strlen(host) - 1] == ']') {
360 host[strlen(host) - 1] = '\0';
371 if (*cp == ':') /* Leading colon is part of file name. */
377 if (*cp == '@' && *(cp+1) == '[')
379 if (*cp == ']' && *(cp+1) == ':' && flag)
381 if (*cp == ':' && !flag)
389 /* function to assist building execv() arguments */
391 addargs(arglist *args, char *fmt, ...)
399 r = vasprintf(&cp, fmt, ap);
402 fatal("addargs: argument too long");
404 nalloc = args->nalloc;
405 if (args->list == NULL) {
408 } else if (args->num+2 >= nalloc)
411 args->list = xrealloc(args->list, nalloc * sizeof(char *));
412 args->nalloc = nalloc;
413 args->list[args->num++] = cp;
414 args->list[args->num] = NULL;
418 replacearg(arglist *args, u_int which, char *fmt, ...)
425 r = vasprintf(&cp, fmt, ap);
428 fatal("replacearg: argument too long");
430 if (which >= args->num)
431 fatal("replacearg: tried to replace invalid arg %d >= %d",
433 xfree(args->list[which]);
434 args->list[which] = cp;
438 freeargs(arglist *args)
442 if (args->list != NULL) {
443 for (i = 0; i < args->num; i++)
444 xfree(args->list[i]);
446 args->nalloc = args->num = 0;
452 * Expands tildes in the file name. Returns data allocated by xmalloc.
453 * Warning: this calls getpw*.
456 tilde_expand_filename(const char *filename, uid_t uid)
459 char user[128], ret[MAXPATHLEN];
463 if (*filename != '~')
464 return (xstrdup(filename));
467 path = strchr(filename, '/');
468 if (path != NULL && path > filename) { /* ~user/path */
469 slash = path - filename;
470 if (slash > sizeof(user) - 1)
471 fatal("tilde_expand_filename: ~username too long");
472 memcpy(user, filename, slash);
474 if ((pw = getpwnam(user)) == NULL)
475 fatal("tilde_expand_filename: No such user %s", user);
476 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
477 fatal("tilde_expand_filename: No such uid %d", uid);
479 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
480 fatal("tilde_expand_filename: Path too long");
482 /* Make sure directory has a trailing '/' */
483 len = strlen(pw->pw_dir);
484 if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
485 strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
486 fatal("tilde_expand_filename: Path too long");
488 /* Skip leading '/' from specified path */
491 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
492 fatal("tilde_expand_filename: Path too long");
494 return (xstrdup(ret));
498 * Expand a string with a set of %[char] escapes. A number of escapes may be
499 * specified as (char *escape_chars, char *replacement) pairs. The list must
500 * be terminated by a NULL escape_char. Returns replaced string in memory
501 * allocated by xmalloc.
504 percent_expand(const char *string, ...)
506 #define EXPAND_MAX_KEYS 16
510 } keys[EXPAND_MAX_KEYS];
511 u_int num_keys, i, j;
516 va_start(ap, string);
517 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
518 keys[num_keys].key = va_arg(ap, char *);
519 if (keys[num_keys].key == NULL)
521 keys[num_keys].repl = va_arg(ap, char *);
522 if (keys[num_keys].repl == NULL)
523 fatal("percent_expand: NULL replacement");
527 if (num_keys >= EXPAND_MAX_KEYS)
528 fatal("percent_expand: too many keys");
532 for (i = 0; *string != '\0'; string++) {
533 if (*string != '%') {
536 if (i >= sizeof(buf))
537 fatal("percent_expand: string too long");
544 for (j = 0; j < num_keys; j++) {
545 if (strchr(keys[j].key, *string) != NULL) {
546 i = strlcat(buf, keys[j].repl, sizeof(buf));
547 if (i >= sizeof(buf))
548 fatal("percent_expand: string too long");
553 fatal("percent_expand: unknown key %%%c", *string);
555 return (xstrdup(buf));
556 #undef EXPAND_MAX_KEYS
560 * Read an entire line from a public key file into a static buffer, discarding
561 * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
564 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
567 while (fgets(buf, bufsz, f) != NULL) {
569 if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
572 debug("%s: %s line %lu exceeds size limit", __func__,
574 /* discard remainder of line */
575 while (fgetc(f) != '\n' && !feof(f))
583 tun_open(int tun, int mode)
585 #if defined(CUSTOM_SYS_TUN_OPEN)
586 return (sys_tun_open(tun, mode));
587 #elif defined(SSH_TUN_OPENBSD)
592 /* Open the tunnel device */
593 if (tun <= SSH_TUNID_MAX) {
594 snprintf(name, sizeof(name), "/dev/tun%d", tun);
595 fd = open(name, O_RDWR);
596 } else if (tun == SSH_TUNID_ANY) {
597 for (tun = 100; tun >= 0; tun--) {
598 snprintf(name, sizeof(name), "/dev/tun%d", tun);
599 if ((fd = open(name, O_RDWR)) >= 0)
603 debug("%s: invalid tunnel %u", __func__, tun);
608 debug("%s: %s open failed: %s", __func__, name, strerror(errno));
612 debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
614 /* Set the tunnel device operation mode */
615 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
616 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
619 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
622 /* Set interface mode */
623 ifr.ifr_flags &= ~IFF_UP;
624 if (mode == SSH_TUNMODE_ETHERNET)
625 ifr.ifr_flags |= IFF_LINK0;
627 ifr.ifr_flags &= ~IFF_LINK0;
628 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
631 /* Bring interface up */
632 ifr.ifr_flags |= IFF_UP;
633 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
644 debug("%s: failed to set %s mode %d: %s", __func__, name,
645 mode, strerror(errno));
648 error("Tunnel interfaces are not supported on this platform");
658 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
659 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
662 while (++dupfd <= 2) {
663 /* Only clobber closed fds */
664 if (fcntl(dupfd, F_GETFL, 0) >= 0)
666 if (dup2(nullfd, dupfd) == -1) {
667 fprintf(stderr, "dup2: %s", strerror(errno));
676 tohex(const u_char *d, u_int l)
684 for (i = 0; i < l; i++) {
685 snprintf(b, sizeof(b), "%02x", d[i]);