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 1.37 2005/12/08 18:34:11 reyk Exp $");
33 /* remove newline at end of string */
39 if (*t == '\n' || *t == '\r') {
49 /* set/unset filedescriptor to non-blocking */
55 val = fcntl(fd, F_GETFL, 0);
57 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
60 if (val & O_NONBLOCK) {
61 debug3("fd %d is O_NONBLOCK", fd);
64 debug2("fd %d setting O_NONBLOCK", fd);
66 if (fcntl(fd, F_SETFL, val) == -1) {
67 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
75 unset_nonblock(int fd)
79 val = fcntl(fd, F_GETFL, 0);
81 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
84 if (!(val & O_NONBLOCK)) {
85 debug3("fd %d is not O_NONBLOCK", fd);
88 debug("fd %d clearing O_NONBLOCK", fd);
90 if (fcntl(fd, F_SETFL, val) == -1) {
91 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
98 /* disable nagle on socket */
106 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
107 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
111 debug2("fd %d is TCP_NODELAY", fd);
115 debug2("fd %d setting TCP_NODELAY", fd);
116 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
117 error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
120 /* Characters considered whitespace in strsep calls. */
121 #define WHITESPACE " \t\r\n"
123 /* return next token in configuration line */
135 *s = strpbrk(*s, WHITESPACE "=");
139 /* Allow only one '=' to be skipped */
144 *s += strspn(*s + 1, WHITESPACE) + 1;
145 if (*s[0] == '=' && !wspace)
146 *s += strspn(*s + 1, WHITESPACE) + 1;
152 pwcopy(struct passwd *pw)
154 struct passwd *copy = xmalloc(sizeof(*copy));
156 memset(copy, 0, sizeof(*copy));
157 copy->pw_name = xstrdup(pw->pw_name);
158 copy->pw_passwd = xstrdup(pw->pw_passwd);
159 copy->pw_gecos = xstrdup(pw->pw_gecos);
160 copy->pw_uid = pw->pw_uid;
161 copy->pw_gid = pw->pw_gid;
162 #ifdef HAVE_PW_EXPIRE_IN_PASSWD
163 copy->pw_expire = pw->pw_expire;
165 #ifdef HAVE_PW_CHANGE_IN_PASSWD
166 copy->pw_change = pw->pw_change;
168 #ifdef HAVE_PW_CLASS_IN_PASSWD
169 copy->pw_class = xstrdup(pw->pw_class);
171 copy->pw_dir = xstrdup(pw->pw_dir);
172 copy->pw_shell = xstrdup(pw->pw_shell);
177 * Convert ASCII string to TCP/IP port number.
178 * Port must be >0 and <=65535.
179 * Return 0 if invalid.
182 a2port(const char *s)
188 port = strtol(s, &endp, 0);
189 if (s == endp || *endp != '\0' ||
190 (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) ||
191 port <= 0 || port > 65535)
198 a2tun(const char *s, int *remote)
200 const char *errstr = NULL;
204 if (remote != NULL) {
205 *remote = SSH_TUNID_ANY;
207 if ((ep = strchr(sp, ':')) == NULL) {
209 return (a2tun(s, NULL));
212 *remote = a2tun(ep, NULL);
213 tun = a2tun(sp, NULL);
215 return (*remote == SSH_TUNID_ERR ? *remote : tun);
218 if (strcasecmp(s, "any") == 0)
219 return (SSH_TUNID_ANY);
221 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
223 return (SSH_TUNID_ERR);
229 #define MINUTES (SECONDS * 60)
230 #define HOURS (MINUTES * 60)
231 #define DAYS (HOURS * 24)
232 #define WEEKS (DAYS * 7)
235 * Convert a time string into seconds; format is
239 * Valid time qualifiers are:
253 * Return -1 if time string is invalid.
256 convtime(const char *s)
266 if (p == NULL || *p == '\0')
270 secs = strtol(p, &endp, 10);
272 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
311 * Search for next delimiter between hostnames/addresses and ports.
312 * Argument may be modified (for termination).
313 * Returns *cp if parsing succeeds.
314 * *cp is set to the start of the next delimiter, if one was found.
315 * If this is the last field, *cp is set to NULL.
322 if (cp == NULL || *cp == NULL)
327 if ((s = strchr(s, ']')) == NULL)
331 } else if ((s = strpbrk(s, ":/")) == NULL)
332 s = *cp + strlen(*cp); /* skip to end (see first case below) */
336 *cp = NULL; /* no more fields*/
341 *s = '\0'; /* terminate */
353 cleanhostname(char *host)
355 if (*host == '[' && host[strlen(host) - 1] == ']') {
356 host[strlen(host) - 1] = '\0';
367 if (*cp == ':') /* Leading colon is part of file name. */
373 if (*cp == '@' && *(cp+1) == '[')
375 if (*cp == ']' && *(cp+1) == ':' && flag)
377 if (*cp == ':' && !flag)
385 /* function to assist building execv() arguments */
387 addargs(arglist *args, char *fmt, ...)
394 vsnprintf(buf, sizeof(buf), fmt, ap);
397 nalloc = args->nalloc;
398 if (args->list == NULL) {
401 } else if (args->num+2 >= nalloc)
404 args->list = xrealloc(args->list, nalloc * sizeof(char *));
405 args->nalloc = nalloc;
406 args->list[args->num++] = xstrdup(buf);
407 args->list[args->num] = NULL;
411 * Expands tildes in the file name. Returns data allocated by xmalloc.
412 * Warning: this calls getpw*.
415 tilde_expand_filename(const char *filename, uid_t uid)
418 char user[128], ret[MAXPATHLEN];
422 if (*filename != '~')
423 return (xstrdup(filename));
426 path = strchr(filename, '/');
427 if (path != NULL && path > filename) { /* ~user/path */
428 slash = path - filename;
429 if (slash > sizeof(user) - 1)
430 fatal("tilde_expand_filename: ~username too long");
431 memcpy(user, filename, slash);
433 if ((pw = getpwnam(user)) == NULL)
434 fatal("tilde_expand_filename: No such user %s", user);
435 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
436 fatal("tilde_expand_filename: No such uid %d", uid);
438 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
439 fatal("tilde_expand_filename: Path too long");
441 /* Make sure directory has a trailing '/' */
442 len = strlen(pw->pw_dir);
443 if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
444 strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
445 fatal("tilde_expand_filename: Path too long");
447 /* Skip leading '/' from specified path */
450 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
451 fatal("tilde_expand_filename: Path too long");
453 return (xstrdup(ret));
457 * Expand a string with a set of %[char] escapes. A number of escapes may be
458 * specified as (char *escape_chars, char *replacement) pairs. The list must
459 * be terminated by a NULL escape_char. Returns replaced string in memory
460 * allocated by xmalloc.
463 percent_expand(const char *string, ...)
465 #define EXPAND_MAX_KEYS 16
469 } keys[EXPAND_MAX_KEYS];
470 u_int num_keys, i, j;
475 va_start(ap, string);
476 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
477 keys[num_keys].key = va_arg(ap, char *);
478 if (keys[num_keys].key == NULL)
480 keys[num_keys].repl = va_arg(ap, char *);
481 if (keys[num_keys].repl == NULL)
482 fatal("percent_expand: NULL replacement");
486 if (num_keys >= EXPAND_MAX_KEYS)
487 fatal("percent_expand: too many keys");
491 for (i = 0; *string != '\0'; string++) {
492 if (*string != '%') {
495 if (i >= sizeof(buf))
496 fatal("percent_expand: string too long");
503 for (j = 0; j < num_keys; j++) {
504 if (strchr(keys[j].key, *string) != NULL) {
505 i = strlcat(buf, keys[j].repl, sizeof(buf));
506 if (i >= sizeof(buf))
507 fatal("percent_expand: string too long");
512 fatal("percent_expand: unknown key %%%c", *string);
514 return (xstrdup(buf));
515 #undef EXPAND_MAX_KEYS
519 * Read an entire line from a public key file into a static buffer, discarding
520 * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
523 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
526 while (fgets(buf, bufsz, f) != NULL) {
528 if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
531 debug("%s: %s line %lu exceeds size limit", __func__,
533 /* discard remainder of line */
534 while (fgetc(f) != '\n' && !feof(f))
542 tun_open(int tun, int mode)
544 #if defined(CUSTOM_SYS_TUN_OPEN)
545 return (sys_tun_open(tun, mode));
546 #elif defined(SSH_TUN_BSD)
551 /* Open the tunnel device */
552 if (tun <= SSH_TUNID_MAX) {
553 snprintf(name, sizeof(name), "/dev/tun%d", tun);
554 fd = open(name, O_RDWR);
555 } else if (tun == SSH_TUNID_ANY) {
556 for (tun = 100; tun >= 0; tun--) {
557 snprintf(name, sizeof(name), "/dev/tun%d", tun);
558 if ((fd = open(name, O_RDWR)) >= 0)
562 debug("%s: invalid tunnel %u\n", __func__, tun);
567 debug("%s: %s open failed: %s", __func__, name, strerror(errno));
571 debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
573 /* Set the tunnel device operation mode */
574 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
575 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
578 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
580 if (mode == SSH_TUNMODE_ETHERNET) {
581 ifr.ifr_flags |= IFF_LINK0;
582 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
585 ifr.ifr_flags |= IFF_UP;
586 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
597 debug("%s: failed to set %s mode %d: %s", __func__, name,
598 mode, strerror(errno));
601 error("Tunnel interfaces are not supported on this platform");
611 if ((nullfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
612 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno));
616 if (dup2(nullfd, nullfd + 1) == -1) {
617 fprintf(stderr, "dup2: %s", strerror(errno));
627 tohex(const u_char *d, u_int l)
635 for (i = 0; i < l; i++) {
636 snprintf(b, sizeof(b), "%02x", d[i]);