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 1.44 2006/02/08 12:32:49 stevesk Exp $");
29 #include <netinet/tcp.h>
33 #ifdef SSH_TUN_OPENBSD
41 /* remove newline at end of string */
47 if (*t == '\n' || *t == '\r') {
57 /* set/unset filedescriptor to non-blocking */
63 val = fcntl(fd, F_GETFL, 0);
65 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
68 if (val & O_NONBLOCK) {
69 debug3("fd %d is O_NONBLOCK", fd);
72 debug2("fd %d setting O_NONBLOCK", fd);
74 if (fcntl(fd, F_SETFL, val) == -1) {
75 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
83 unset_nonblock(int fd)
87 val = fcntl(fd, F_GETFL, 0);
89 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
92 if (!(val & O_NONBLOCK)) {
93 debug3("fd %d is not O_NONBLOCK", fd);
96 debug("fd %d clearing O_NONBLOCK", fd);
98 if (fcntl(fd, F_SETFL, val) == -1) {
99 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
100 fd, strerror(errno));
106 /* disable nagle on socket */
114 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
115 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
119 debug2("fd %d is TCP_NODELAY", fd);
123 debug2("fd %d setting TCP_NODELAY", fd);
124 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
125 error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
128 /* Characters considered whitespace in strsep calls. */
129 #define WHITESPACE " \t\r\n"
131 /* return next token in configuration line */
143 *s = strpbrk(*s, WHITESPACE "=");
147 /* Allow only one '=' to be skipped */
152 *s += strspn(*s + 1, WHITESPACE) + 1;
153 if (*s[0] == '=' && !wspace)
154 *s += strspn(*s + 1, WHITESPACE) + 1;
160 pwcopy(struct passwd *pw)
162 struct passwd *copy = xmalloc(sizeof(*copy));
164 memset(copy, 0, sizeof(*copy));
165 copy->pw_name = xstrdup(pw->pw_name);
166 copy->pw_passwd = xstrdup(pw->pw_passwd);
167 copy->pw_gecos = xstrdup(pw->pw_gecos);
168 copy->pw_uid = pw->pw_uid;
169 copy->pw_gid = pw->pw_gid;
170 #ifdef HAVE_PW_EXPIRE_IN_PASSWD
171 copy->pw_expire = pw->pw_expire;
173 #ifdef HAVE_PW_CHANGE_IN_PASSWD
174 copy->pw_change = pw->pw_change;
176 #ifdef HAVE_PW_CLASS_IN_PASSWD
177 copy->pw_class = xstrdup(pw->pw_class);
179 copy->pw_dir = xstrdup(pw->pw_dir);
180 copy->pw_shell = xstrdup(pw->pw_shell);
185 * Convert ASCII string to TCP/IP port number.
186 * Port must be >0 and <=65535.
187 * Return 0 if invalid.
190 a2port(const char *s)
196 port = strtol(s, &endp, 0);
197 if (s == endp || *endp != '\0' ||
198 (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
199 port <= 0 || port > 65535)
206 a2tun(const char *s, int *remote)
208 const char *errstr = NULL;
212 if (remote != NULL) {
213 *remote = SSH_TUNID_ANY;
215 if ((ep = strchr(sp, ':')) == NULL) {
217 return (a2tun(s, NULL));
220 *remote = a2tun(ep, NULL);
221 tun = a2tun(sp, NULL);
223 return (*remote == SSH_TUNID_ERR ? *remote : tun);
226 if (strcasecmp(s, "any") == 0)
227 return (SSH_TUNID_ANY);
229 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
231 return (SSH_TUNID_ERR);
237 #define MINUTES (SECONDS * 60)
238 #define HOURS (MINUTES * 60)
239 #define DAYS (HOURS * 24)
240 #define WEEKS (DAYS * 7)
243 * Convert a time string into seconds; format is
247 * Valid time qualifiers are:
261 * Return -1 if time string is invalid.
264 convtime(const char *s)
274 if (p == NULL || *p == '\0')
278 secs = strtol(p, &endp, 10);
280 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
319 * Search for next delimiter between hostnames/addresses and ports.
320 * Argument may be modified (for termination).
321 * Returns *cp if parsing succeeds.
322 * *cp is set to the start of the next delimiter, if one was found.
323 * If this is the last field, *cp is set to NULL.
330 if (cp == NULL || *cp == NULL)
335 if ((s = strchr(s, ']')) == NULL)
339 } else if ((s = strpbrk(s, ":/")) == NULL)
340 s = *cp + strlen(*cp); /* skip to end (see first case below) */
344 *cp = NULL; /* no more fields*/
349 *s = '\0'; /* terminate */
361 cleanhostname(char *host)
363 if (*host == '[' && host[strlen(host) - 1] == ']') {
364 host[strlen(host) - 1] = '\0';
375 if (*cp == ':') /* Leading colon is part of file name. */
381 if (*cp == '@' && *(cp+1) == '[')
383 if (*cp == ']' && *(cp+1) == ':' && flag)
385 if (*cp == ':' && !flag)
393 /* function to assist building execv() arguments */
395 addargs(arglist *args, char *fmt, ...)
403 r = vasprintf(&cp, fmt, ap);
406 fatal("addargs: argument too long");
408 nalloc = args->nalloc;
409 if (args->list == NULL) {
412 } else if (args->num+2 >= nalloc)
415 args->list = xrealloc(args->list, nalloc * sizeof(char *));
416 args->nalloc = nalloc;
417 args->list[args->num++] = cp;
418 args->list[args->num] = NULL;
422 replacearg(arglist *args, u_int which, char *fmt, ...)
429 r = vasprintf(&cp, fmt, ap);
432 fatal("replacearg: argument too long");
434 if (which >= args->num)
435 fatal("replacearg: tried to replace invalid arg %d >= %d",
437 xfree(args->list[which]);
438 args->list[which] = cp;
442 freeargs(arglist *args)
446 if (args->list != NULL) {
447 for (i = 0; i < args->num; i++)
448 xfree(args->list[i]);
450 args->nalloc = args->num = 0;
456 * Expands tildes in the file name. Returns data allocated by xmalloc.
457 * Warning: this calls getpw*.
460 tilde_expand_filename(const char *filename, uid_t uid)
463 char user[128], ret[MAXPATHLEN];
467 if (*filename != '~')
468 return (xstrdup(filename));
471 path = strchr(filename, '/');
472 if (path != NULL && path > filename) { /* ~user/path */
473 slash = path - filename;
474 if (slash > sizeof(user) - 1)
475 fatal("tilde_expand_filename: ~username too long");
476 memcpy(user, filename, slash);
478 if ((pw = getpwnam(user)) == NULL)
479 fatal("tilde_expand_filename: No such user %s", user);
480 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
481 fatal("tilde_expand_filename: No such uid %d", uid);
483 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
484 fatal("tilde_expand_filename: Path too long");
486 /* Make sure directory has a trailing '/' */
487 len = strlen(pw->pw_dir);
488 if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
489 strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
490 fatal("tilde_expand_filename: Path too long");
492 /* Skip leading '/' from specified path */
495 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
496 fatal("tilde_expand_filename: Path too long");
498 return (xstrdup(ret));
502 * Expand a string with a set of %[char] escapes. A number of escapes may be
503 * specified as (char *escape_chars, char *replacement) pairs. The list must
504 * be terminated by a NULL escape_char. Returns replaced string in memory
505 * allocated by xmalloc.
508 percent_expand(const char *string, ...)
510 #define EXPAND_MAX_KEYS 16
514 } keys[EXPAND_MAX_KEYS];
515 u_int num_keys, i, j;
520 va_start(ap, string);
521 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
522 keys[num_keys].key = va_arg(ap, char *);
523 if (keys[num_keys].key == NULL)
525 keys[num_keys].repl = va_arg(ap, char *);
526 if (keys[num_keys].repl == NULL)
527 fatal("percent_expand: NULL replacement");
531 if (num_keys >= EXPAND_MAX_KEYS)
532 fatal("percent_expand: too many keys");
536 for (i = 0; *string != '\0'; string++) {
537 if (*string != '%') {
540 if (i >= sizeof(buf))
541 fatal("percent_expand: string too long");
548 for (j = 0; j < num_keys; j++) {
549 if (strchr(keys[j].key, *string) != NULL) {
550 i = strlcat(buf, keys[j].repl, sizeof(buf));
551 if (i >= sizeof(buf))
552 fatal("percent_expand: string too long");
557 fatal("percent_expand: unknown key %%%c", *string);
559 return (xstrdup(buf));
560 #undef EXPAND_MAX_KEYS
564 * Read an entire line from a public key file into a static buffer, discarding
565 * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
568 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
571 while (fgets(buf, bufsz, f) != NULL) {
573 if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
576 debug("%s: %s line %lu exceeds size limit", __func__,
578 /* discard remainder of line */
579 while (fgetc(f) != '\n' && !feof(f))
587 tun_open(int tun, int mode)
589 #if defined(CUSTOM_SYS_TUN_OPEN)
590 return (sys_tun_open(tun, mode));
591 #elif defined(SSH_TUN_OPENBSD)
596 /* Open the tunnel device */
597 if (tun <= SSH_TUNID_MAX) {
598 snprintf(name, sizeof(name), "/dev/tun%d", tun);
599 fd = open(name, O_RDWR);
600 } else if (tun == SSH_TUNID_ANY) {
601 for (tun = 100; tun >= 0; tun--) {
602 snprintf(name, sizeof(name), "/dev/tun%d", tun);
603 if ((fd = open(name, O_RDWR)) >= 0)
607 debug("%s: invalid tunnel %u", __func__, tun);
612 debug("%s: %s open failed: %s", __func__, name, strerror(errno));
616 debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
618 /* Set the tunnel device operation mode */
619 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
620 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
623 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
626 /* Set interface mode */
627 ifr.ifr_flags &= ~IFF_UP;
628 if (mode == SSH_TUNMODE_ETHERNET)
629 ifr.ifr_flags |= IFF_LINK0;
631 ifr.ifr_flags &= ~IFF_LINK0;
632 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
635 /* Bring interface up */
636 ifr.ifr_flags |= IFF_UP;
637 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
648 debug("%s: failed to set %s mode %d: %s", __func__, name,
649 mode, strerror(errno));
652 error("Tunnel interfaces are not supported on this platform");
662 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
663 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
666 while (++dupfd <= 2) {
667 /* Only clobber closed fds */
668 if (fcntl(dupfd, F_GETFL, 0) >= 0)
670 if (dup2(nullfd, dupfd) == -1) {
671 fprintf(stderr, "dup2: %s", strerror(errno));
680 tohex(const u_char *d, u_int l)
688 for (i = 0; i < l; i++) {
689 snprintf(b, sizeof(b), "%02x", d[i]);