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 /* Characters considered as quotations. */
130 /* return next token in configuration line */
142 if ((q=strchr(QUOTES, (int) *old)) && *q)
144 /* find next quote character, point old to start of quoted
146 for (p = ++old;*p && *p!=*q; p++)
149 /* find start of next token */
150 *s = (*p) ? p + strspn(p + 1, WHITESPACE) + 1 : NULL;
152 /* terminate 'old' token */
157 *s = strpbrk(*s, WHITESPACE "=");
161 /* Allow only one '=' to be skipped */
166 *s += strspn(*s + 1, WHITESPACE) + 1;
167 if (*s[0] == '=' && !wspace)
168 *s += strspn(*s + 1, WHITESPACE) + 1;
174 pwcopy(struct passwd *pw)
176 struct passwd *copy = xmalloc(sizeof(*copy));
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;
187 #ifdef HAVE_PW_CHANGE_IN_PASSWD
188 copy->pw_change = pw->pw_change;
190 #ifdef HAVE_PW_CLASS_IN_PASSWD
191 copy->pw_class = xstrdup(pw->pw_class);
193 copy->pw_dir = xstrdup(pw->pw_dir);
194 copy->pw_shell = xstrdup(pw->pw_shell);
199 * Convert ASCII string to TCP/IP port number.
200 * Port must be >0 and <=65535.
201 * Return 0 if invalid.
204 a2port(const char *s)
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)
220 a2tun(const char *s, int *remote)
222 const char *errstr = NULL;
226 if (remote != NULL) {
227 *remote = SSH_TUNID_ANY;
229 if ((ep = strchr(sp, ':')) == NULL) {
231 return (a2tun(s, NULL));
234 *remote = a2tun(ep, NULL);
235 tun = a2tun(sp, NULL);
237 return (*remote == SSH_TUNID_ERR ? *remote : tun);
240 if (strcasecmp(s, "any") == 0)
241 return (SSH_TUNID_ANY);
243 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
245 return (SSH_TUNID_ERR);
251 #define MINUTES (SECONDS * 60)
252 #define HOURS (MINUTES * 60)
253 #define DAYS (HOURS * 24)
254 #define WEEKS (DAYS * 7)
257 * Convert a time string into seconds; format is
261 * Valid time qualifiers are:
275 * Return -1 if time string is invalid.
278 convtime(const char *s)
288 if (p == NULL || *p == '\0')
292 secs = strtol(p, &endp, 10);
294 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
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.
344 if (cp == NULL || *cp == NULL)
349 if ((s = strchr(s, ']')) == NULL)
353 } else if ((s = strpbrk(s, ":/")) == NULL)
354 s = *cp + strlen(*cp); /* skip to end (see first case below) */
358 *cp = NULL; /* no more fields*/
363 *s = '\0'; /* terminate */
375 cleanhostname(char *host)
377 if (*host == '[' && host[strlen(host) - 1] == ']') {
378 host[strlen(host) - 1] = '\0';
389 if (*cp == ':') /* Leading colon is part of file name. */
395 if (*cp == '@' && *(cp+1) == '[')
397 if (*cp == ']' && *(cp+1) == ':' && flag)
399 if (*cp == ':' && !flag)
407 /* function to assist building execv() arguments */
409 addargs(arglist *args, char *fmt, ...)
417 r = vasprintf(&cp, fmt, ap);
420 fatal("addargs: argument too long");
422 nalloc = args->nalloc;
423 if (args->list == NULL) {
426 } else if (args->num+2 >= nalloc)
429 args->list = xrealloc(args->list, nalloc * sizeof(char *));
430 args->nalloc = nalloc;
431 args->list[args->num++] = cp;
432 args->list[args->num] = NULL;
436 replacearg(arglist *args, u_int which, char *fmt, ...)
443 r = vasprintf(&cp, fmt, ap);
446 fatal("replacearg: argument too long");
448 if (which >= args->num)
449 fatal("replacearg: tried to replace invalid arg %d >= %d",
451 xfree(args->list[which]);
452 args->list[which] = cp;
456 freeargs(arglist *args)
460 if (args->list != NULL) {
461 for (i = 0; i < args->num; i++)
462 xfree(args->list[i]);
464 args->nalloc = args->num = 0;
470 * Expands tildes in the file name. Returns data allocated by xmalloc.
471 * Warning: this calls getpw*.
474 tilde_expand_filename(const char *filename, uid_t uid)
477 char user[128], ret[MAXPATHLEN];
481 if (*filename != '~')
482 return (xstrdup(filename));
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);
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);
497 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
498 fatal("tilde_expand_filename: Path too long");
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");
506 /* Skip leading '/' from specified path */
509 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
510 fatal("tilde_expand_filename: Path too long");
512 return (xstrdup(ret));
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.
522 percent_expand(const char *string, ...)
524 #define EXPAND_MAX_KEYS 16
528 } keys[EXPAND_MAX_KEYS];
529 u_int num_keys, i, j;
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)
539 keys[num_keys].repl = va_arg(ap, char *);
540 if (keys[num_keys].repl == NULL)
541 fatal("percent_expand: NULL replacement");
545 if (num_keys >= EXPAND_MAX_KEYS)
546 fatal("percent_expand: too many keys");
550 for (i = 0; *string != '\0'; string++) {
551 if (*string != '%') {
554 if (i >= sizeof(buf))
555 fatal("percent_expand: string too long");
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");
571 fatal("percent_expand: unknown key %%%c", *string);
573 return (xstrdup(buf));
574 #undef EXPAND_MAX_KEYS
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.
582 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
585 while (fgets(buf, bufsz, f) != NULL) {
587 if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
590 debug("%s: %s line %lu exceeds size limit", __func__,
592 /* discard remainder of line */
593 while (fgetc(f) != '\n' && !feof(f))
601 tun_open(int tun, int mode)
603 #if defined(CUSTOM_SYS_TUN_OPEN)
604 return (sys_tun_open(tun, mode));
605 #elif defined(SSH_TUN_OPENBSD)
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)
621 debug("%s: invalid tunnel %u", __func__, tun);
626 debug("%s: %s open failed: %s", __func__, name, strerror(errno));
630 debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
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)
637 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
640 /* Set interface mode */
641 ifr.ifr_flags &= ~IFF_UP;
642 if (mode == SSH_TUNMODE_ETHERNET)
643 ifr.ifr_flags |= IFF_LINK0;
645 ifr.ifr_flags &= ~IFF_LINK0;
646 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
649 /* Bring interface up */
650 ifr.ifr_flags |= IFF_UP;
651 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
662 debug("%s: failed to set %s mode %d: %s", __func__, name,
663 mode, strerror(errno));
666 error("Tunnel interfaces are not supported on this platform");
676 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
677 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
680 while (++dupfd <= 2) {
681 /* Only clobber closed fds */
682 if (fcntl(dupfd, F_GETFL, 0) >= 0)
684 if (dup2(nullfd, dupfd) == -1) {
685 fprintf(stderr, "dup2: %s", strerror(errno));
694 tohex(const u_char *d, u_int l)
702 for (i = 0; i < l; i++) {
703 snprintf(b, sizeof(b), "%02x", d[i]);