Annotation of src/usr.bin/ssh/misc.c, Revision 1.72
1.72 ! reyk 1: /* $OpenBSD: misc.c,v 1.71 2009/02/21 19:32:04 tobias Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.52 djm 4: * Copyright (c) 2005,2006 Damien Miller. All rights reserved.
1.1 markus 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
1.64 deraadt 27: #include <sys/types.h>
1.45 stevesk 28: #include <sys/ioctl.h>
1.53 stevesk 29: #include <sys/socket.h>
1.61 stevesk 30: #include <sys/param.h>
1.38 stevesk 31:
32: #include <net/if.h>
1.53 stevesk 33: #include <netinet/in.h>
1.44 stevesk 34: #include <netinet/tcp.h>
1.43 stevesk 35:
1.58 stevesk 36: #include <errno.h>
1.55 stevesk 37: #include <fcntl.h>
1.66 dtucker 38: #include <netdb.h>
1.43 stevesk 39: #include <paths.h>
1.54 stevesk 40: #include <pwd.h>
1.57 stevesk 41: #include <stdarg.h>
1.63 stevesk 42: #include <stdio.h>
1.62 stevesk 43: #include <stdlib.h>
1.60 stevesk 44: #include <string.h>
1.59 stevesk 45: #include <unistd.h>
1.1 markus 46:
1.64 deraadt 47: #include "xmalloc.h"
1.1 markus 48: #include "misc.h"
49: #include "log.h"
1.56 dtucker 50: #include "ssh.h"
1.1 markus 51:
1.12 markus 52: /* remove newline at end of string */
1.1 markus 53: char *
54: chop(char *s)
55: {
56: char *t = s;
57: while (*t) {
1.13 deraadt 58: if (*t == '\n' || *t == '\r') {
1.1 markus 59: *t = '\0';
60: return s;
61: }
62: t++;
63: }
64: return s;
65:
66: }
67:
1.12 markus 68: /* set/unset filedescriptor to non-blocking */
1.24 djm 69: int
1.1 markus 70: set_nonblock(int fd)
71: {
72: int val;
1.8 markus 73:
1.1 markus 74: val = fcntl(fd, F_GETFL, 0);
75: if (val < 0) {
76: error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
1.24 djm 77: return (-1);
1.1 markus 78: }
79: if (val & O_NONBLOCK) {
1.24 djm 80: debug3("fd %d is O_NONBLOCK", fd);
81: return (0);
1.1 markus 82: }
1.21 markus 83: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 84: val |= O_NONBLOCK;
1.24 djm 85: if (fcntl(fd, F_SETFL, val) == -1) {
86: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
87: strerror(errno));
88: return (-1);
89: }
90: return (0);
1.8 markus 91: }
92:
1.24 djm 93: int
1.8 markus 94: unset_nonblock(int fd)
95: {
96: int val;
97:
98: val = fcntl(fd, F_GETFL, 0);
99: if (val < 0) {
100: error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno));
1.24 djm 101: return (-1);
1.8 markus 102: }
103: if (!(val & O_NONBLOCK)) {
1.24 djm 104: debug3("fd %d is not O_NONBLOCK", fd);
105: return (0);
1.8 markus 106: }
1.10 markus 107: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 108: val &= ~O_NONBLOCK;
1.24 djm 109: if (fcntl(fd, F_SETFL, val) == -1) {
110: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 111: fd, strerror(errno));
1.24 djm 112: return (-1);
113: }
114: return (0);
1.66 dtucker 115: }
116:
117: const char *
118: ssh_gai_strerror(int gaierr)
119: {
1.67 dtucker 120: if (gaierr == EAI_SYSTEM)
121: return strerror(errno);
122: return gai_strerror(gaierr);
1.15 stevesk 123: }
124:
125: /* disable nagle on socket */
126: void
127: set_nodelay(int fd)
128: {
1.17 stevesk 129: int opt;
130: socklen_t optlen;
1.15 stevesk 131:
1.16 stevesk 132: optlen = sizeof opt;
133: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 134: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 135: return;
136: }
137: if (opt == 1) {
138: debug2("fd %d is TCP_NODELAY", fd);
139: return;
140: }
141: opt = 1;
1.20 markus 142: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 143: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 144: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.72 ! reyk 145: }
! 146:
! 147: /* open a socket in the specified routing domain */
! 148: int
! 149: socket_rdomain(int domain, int type, int protocol, int rdomain)
! 150: {
! 151: int sock, ipproto = IPPROTO_IP;
! 152:
! 153: if ((sock = socket(domain, type, protocol)) == -1)
! 154: return (-1);
! 155:
! 156: if (rdomain == -1)
! 157: return (sock);
! 158:
! 159: switch (domain) {
! 160: case AF_INET6:
! 161: ipproto = IPPROTO_IPV6;
! 162: /* FALLTHROUGH */
! 163: case AF_INET:
! 164: debug2("socket %d af %d setting rdomain %d",
! 165: sock, domain, rdomain);
! 166: if (setsockopt(sock, ipproto, SO_RDOMAIN, &rdomain,
! 167: sizeof(rdomain)) == -1) {
! 168: debug("setsockopt SO_RDOMAIN: %.100s",
! 169: strerror(errno));
! 170: close(sock);
! 171: return (-1);
! 172: }
! 173: break;
! 174: default:
! 175: debug("socket %d af %d does not support rdomain %d",
! 176: sock, domain, rdomain);
! 177: close(sock);
! 178: return (-1);
! 179: }
! 180:
! 181: return (sock);
1.1 markus 182: }
183:
184: /* Characters considered whitespace in strsep calls. */
185: #define WHITESPACE " \t\r\n"
1.46 dtucker 186: #define QUOTE "\""
1.1 markus 187:
1.12 markus 188: /* return next token in configuration line */
1.1 markus 189: char *
190: strdelim(char **s)
191: {
192: char *old;
193: int wspace = 0;
194:
195: if (*s == NULL)
196: return NULL;
197:
198: old = *s;
199:
1.46 dtucker 200: *s = strpbrk(*s, WHITESPACE QUOTE "=");
1.1 markus 201: if (*s == NULL)
202: return (old);
203:
1.46 dtucker 204: if (*s[0] == '\"') {
205: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
206: /* Find matching quote */
207: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
208: return (NULL); /* no matching quote */
209: } else {
210: *s[0] = '\0';
211: return (old);
212: }
213: }
214:
1.1 markus 215: /* Allow only one '=' to be skipped */
216: if (*s[0] == '=')
217: wspace = 1;
218: *s[0] = '\0';
219:
1.46 dtucker 220: /* Skip any extra whitespace after first token */
1.1 markus 221: *s += strspn(*s + 1, WHITESPACE) + 1;
222: if (*s[0] == '=' && !wspace)
223: *s += strspn(*s + 1, WHITESPACE) + 1;
224:
225: return (old);
1.2 markus 226: }
227:
228: struct passwd *
229: pwcopy(struct passwd *pw)
230: {
1.49 djm 231: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 232:
1.2 markus 233: copy->pw_name = xstrdup(pw->pw_name);
234: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 235: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 236: copy->pw_uid = pw->pw_uid;
237: copy->pw_gid = pw->pw_gid;
1.11 markus 238: copy->pw_expire = pw->pw_expire;
239: copy->pw_change = pw->pw_change;
1.2 markus 240: copy->pw_class = xstrdup(pw->pw_class);
241: copy->pw_dir = xstrdup(pw->pw_dir);
242: copy->pw_shell = xstrdup(pw->pw_shell);
243: return copy;
1.5 stevesk 244: }
245:
1.12 markus 246: /*
247: * Convert ASCII string to TCP/IP port number.
1.70 djm 248: * Port must be >=0 and <=65535.
249: * Return -1 if invalid.
1.12 markus 250: */
251: int
252: a2port(const char *s)
1.5 stevesk 253: {
1.70 djm 254: long long port;
255: const char *errstr;
1.5 stevesk 256:
1.70 djm 257: port = strtonum(s, 0, 65535, &errstr);
258: if (errstr != NULL)
259: return -1;
260: return (int)port;
1.9 stevesk 261: }
262:
1.36 reyk 263: int
264: a2tun(const char *s, int *remote)
265: {
266: const char *errstr = NULL;
267: char *sp, *ep;
268: int tun;
269:
270: if (remote != NULL) {
1.37 reyk 271: *remote = SSH_TUNID_ANY;
1.36 reyk 272: sp = xstrdup(s);
273: if ((ep = strchr(sp, ':')) == NULL) {
274: xfree(sp);
275: return (a2tun(s, NULL));
276: }
277: ep[0] = '\0'; ep++;
278: *remote = a2tun(ep, NULL);
279: tun = a2tun(sp, NULL);
280: xfree(sp);
1.37 reyk 281: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 282: }
283:
284: if (strcasecmp(s, "any") == 0)
1.37 reyk 285: return (SSH_TUNID_ANY);
1.36 reyk 286:
1.37 reyk 287: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
288: if (errstr != NULL)
289: return (SSH_TUNID_ERR);
1.36 reyk 290:
291: return (tun);
292: }
293:
1.9 stevesk 294: #define SECONDS 1
295: #define MINUTES (SECONDS * 60)
296: #define HOURS (MINUTES * 60)
297: #define DAYS (HOURS * 24)
298: #define WEEKS (DAYS * 7)
299:
1.12 markus 300: /*
301: * Convert a time string into seconds; format is
302: * a sequence of:
303: * time[qualifier]
304: *
305: * Valid time qualifiers are:
306: * <none> seconds
307: * s|S seconds
308: * m|M minutes
309: * h|H hours
310: * d|D days
311: * w|W weeks
312: *
313: * Examples:
314: * 90m 90 minutes
315: * 1h30m 90 minutes
316: * 2d 2 days
317: * 1w 1 week
318: *
319: * Return -1 if time string is invalid.
320: */
321: long
322: convtime(const char *s)
1.9 stevesk 323: {
324: long total, secs;
325: const char *p;
326: char *endp;
327:
328: errno = 0;
329: total = 0;
330: p = s;
331:
332: if (p == NULL || *p == '\0')
333: return -1;
334:
335: while (*p) {
336: secs = strtol(p, &endp, 10);
337: if (p == endp ||
338: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
339: secs < 0)
340: return -1;
341:
342: switch (*endp++) {
343: case '\0':
344: endp--;
1.48 deraadt 345: break;
1.9 stevesk 346: case 's':
347: case 'S':
348: break;
349: case 'm':
350: case 'M':
351: secs *= MINUTES;
352: break;
353: case 'h':
354: case 'H':
355: secs *= HOURS;
356: break;
357: case 'd':
358: case 'D':
359: secs *= DAYS;
360: break;
361: case 'w':
362: case 'W':
363: secs *= WEEKS;
364: break;
365: default:
366: return -1;
367: }
368: total += secs;
369: if (total < 0)
370: return -1;
371: p = endp;
372: }
373:
374: return total;
1.56 dtucker 375: }
376:
377: /*
378: * Returns a standardized host+port identifier string.
379: * Caller must free returned string.
380: */
381: char *
382: put_host_port(const char *host, u_short port)
383: {
384: char *hoststr;
385:
386: if (port == 0 || port == SSH_DEFAULT_PORT)
387: return(xstrdup(host));
388: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
389: fatal("put_host_port: asprintf: %s", strerror(errno));
390: debug3("put_host_port: %s", hoststr);
391: return hoststr;
1.28 djm 392: }
393:
394: /*
395: * Search for next delimiter between hostnames/addresses and ports.
396: * Argument may be modified (for termination).
397: * Returns *cp if parsing succeeds.
398: * *cp is set to the start of the next delimiter, if one was found.
399: * If this is the last field, *cp is set to NULL.
400: */
401: char *
402: hpdelim(char **cp)
403: {
404: char *s, *old;
405:
406: if (cp == NULL || *cp == NULL)
407: return NULL;
408:
409: old = s = *cp;
410: if (*s == '[') {
411: if ((s = strchr(s, ']')) == NULL)
412: return NULL;
413: else
414: s++;
415: } else if ((s = strpbrk(s, ":/")) == NULL)
416: s = *cp + strlen(*cp); /* skip to end (see first case below) */
417:
418: switch (*s) {
419: case '\0':
420: *cp = NULL; /* no more fields*/
421: break;
1.29 deraadt 422:
1.28 djm 423: case ':':
424: case '/':
425: *s = '\0'; /* terminate */
426: *cp = s + 1;
427: break;
1.29 deraadt 428:
1.28 djm 429: default:
430: return NULL;
431: }
432:
433: return old;
1.6 mouring 434: }
435:
436: char *
437: cleanhostname(char *host)
438: {
439: if (*host == '[' && host[strlen(host) - 1] == ']') {
440: host[strlen(host) - 1] = '\0';
441: return (host + 1);
442: } else
443: return host;
444: }
445:
446: char *
447: colon(char *cp)
448: {
449: int flag = 0;
450:
451: if (*cp == ':') /* Leading colon is part of file name. */
452: return (0);
453: if (*cp == '[')
454: flag = 1;
455:
456: for (; *cp; ++cp) {
457: if (*cp == '@' && *(cp+1) == '[')
458: flag = 1;
459: if (*cp == ']' && *(cp+1) == ':' && flag)
460: return (cp+1);
461: if (*cp == ':' && !flag)
462: return (cp);
463: if (*cp == '/')
464: return (0);
465: }
466: return (0);
1.7 mouring 467: }
468:
1.12 markus 469: /* function to assist building execv() arguments */
1.7 mouring 470: void
471: addargs(arglist *args, char *fmt, ...)
472: {
473: va_list ap;
1.42 djm 474: char *cp;
1.25 avsm 475: u_int nalloc;
1.42 djm 476: int r;
1.7 mouring 477:
478: va_start(ap, fmt);
1.42 djm 479: r = vasprintf(&cp, fmt, ap);
1.7 mouring 480: va_end(ap);
1.42 djm 481: if (r == -1)
482: fatal("addargs: argument too long");
1.7 mouring 483:
1.22 markus 484: nalloc = args->nalloc;
1.7 mouring 485: if (args->list == NULL) {
1.22 markus 486: nalloc = 32;
1.7 mouring 487: args->num = 0;
1.22 markus 488: } else if (args->num+2 >= nalloc)
489: nalloc *= 2;
1.7 mouring 490:
1.50 djm 491: args->list = xrealloc(args->list, nalloc, sizeof(char *));
1.22 markus 492: args->nalloc = nalloc;
1.42 djm 493: args->list[args->num++] = cp;
1.7 mouring 494: args->list[args->num] = NULL;
1.42 djm 495: }
496:
497: void
498: replacearg(arglist *args, u_int which, char *fmt, ...)
499: {
500: va_list ap;
501: char *cp;
502: int r;
503:
504: va_start(ap, fmt);
505: r = vasprintf(&cp, fmt, ap);
506: va_end(ap);
507: if (r == -1)
508: fatal("replacearg: argument too long");
509:
510: if (which >= args->num)
511: fatal("replacearg: tried to replace invalid arg %d >= %d",
512: which, args->num);
513: xfree(args->list[which]);
514: args->list[which] = cp;
515: }
516:
517: void
518: freeargs(arglist *args)
519: {
520: u_int i;
521:
522: if (args->list != NULL) {
523: for (i = 0; i < args->num; i++)
524: xfree(args->list[i]);
525: xfree(args->list);
526: args->nalloc = args->num = 0;
527: args->list = NULL;
528: }
1.30 djm 529: }
530:
531: /*
532: * Expands tildes in the file name. Returns data allocated by xmalloc.
533: * Warning: this calls getpw*.
534: */
535: char *
536: tilde_expand_filename(const char *filename, uid_t uid)
537: {
538: const char *path;
539: char user[128], ret[MAXPATHLEN];
540: struct passwd *pw;
1.32 djm 541: u_int len, slash;
1.30 djm 542:
543: if (*filename != '~')
544: return (xstrdup(filename));
545: filename++;
546:
547: path = strchr(filename, '/');
548: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 549: slash = path - filename;
550: if (slash > sizeof(user) - 1)
1.30 djm 551: fatal("tilde_expand_filename: ~username too long");
1.32 djm 552: memcpy(user, filename, slash);
553: user[slash] = '\0';
1.30 djm 554: if ((pw = getpwnam(user)) == NULL)
555: fatal("tilde_expand_filename: No such user %s", user);
556: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 557: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 558:
559: if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
560: fatal("tilde_expand_filename: Path too long");
561:
562: /* Make sure directory has a trailing '/' */
563: len = strlen(pw->pw_dir);
564: if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
565: strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
566: fatal("tilde_expand_filename: Path too long");
567:
568: /* Skip leading '/' from specified path */
569: if (path != NULL)
570: filename = path + 1;
571: if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
572: fatal("tilde_expand_filename: Path too long");
573:
574: return (xstrdup(ret));
1.31 djm 575: }
576:
577: /*
578: * Expand a string with a set of %[char] escapes. A number of escapes may be
579: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 580: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 581: * allocated by xmalloc.
582: */
583: char *
584: percent_expand(const char *string, ...)
585: {
586: #define EXPAND_MAX_KEYS 16
587: struct {
588: const char *key;
589: const char *repl;
590: } keys[EXPAND_MAX_KEYS];
1.32 djm 591: u_int num_keys, i, j;
1.31 djm 592: char buf[4096];
593: va_list ap;
594:
595: /* Gather keys */
596: va_start(ap, string);
597: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
598: keys[num_keys].key = va_arg(ap, char *);
599: if (keys[num_keys].key == NULL)
600: break;
601: keys[num_keys].repl = va_arg(ap, char *);
602: if (keys[num_keys].repl == NULL)
603: fatal("percent_expand: NULL replacement");
604: }
605: va_end(ap);
606:
607: if (num_keys >= EXPAND_MAX_KEYS)
608: fatal("percent_expand: too many keys");
609:
610: /* Expand string */
611: *buf = '\0';
612: for (i = 0; *string != '\0'; string++) {
613: if (*string != '%') {
614: append:
615: buf[i++] = *string;
616: if (i >= sizeof(buf))
617: fatal("percent_expand: string too long");
618: buf[i] = '\0';
619: continue;
620: }
621: string++;
622: if (*string == '%')
623: goto append;
624: for (j = 0; j < num_keys; j++) {
625: if (strchr(keys[j].key, *string) != NULL) {
626: i = strlcat(buf, keys[j].repl, sizeof(buf));
627: if (i >= sizeof(buf))
628: fatal("percent_expand: string too long");
629: break;
630: }
631: }
632: if (j >= num_keys)
633: fatal("percent_expand: unknown key %%%c", *string);
634: }
635: return (xstrdup(buf));
636: #undef EXPAND_MAX_KEYS
1.26 dtucker 637: }
638:
639: /*
640: * Read an entire line from a public key file into a static buffer, discarding
641: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
642: */
643: int
644: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
1.27 dtucker 645: u_long *lineno)
1.26 dtucker 646: {
647: while (fgets(buf, bufsz, f) != NULL) {
1.65 ray 648: if (buf[0] == '\0')
649: continue;
1.26 dtucker 650: (*lineno)++;
651: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
652: return 0;
653: } else {
1.27 dtucker 654: debug("%s: %s line %lu exceeds size limit", __func__,
655: filename, *lineno);
1.26 dtucker 656: /* discard remainder of line */
1.29 deraadt 657: while (fgetc(f) != '\n' && !feof(f))
1.26 dtucker 658: ; /* nothing */
659: }
660: }
661: return -1;
1.36 reyk 662: }
663:
664: int
1.37 reyk 665: tun_open(int tun, int mode)
1.36 reyk 666: {
1.37 reyk 667: struct ifreq ifr;
1.36 reyk 668: char name[100];
1.37 reyk 669: int fd = -1, sock;
1.36 reyk 670:
1.37 reyk 671: /* Open the tunnel device */
672: if (tun <= SSH_TUNID_MAX) {
1.36 reyk 673: snprintf(name, sizeof(name), "/dev/tun%d", tun);
1.37 reyk 674: fd = open(name, O_RDWR);
675: } else if (tun == SSH_TUNID_ANY) {
676: for (tun = 100; tun >= 0; tun--) {
677: snprintf(name, sizeof(name), "/dev/tun%d", tun);
678: if ((fd = open(name, O_RDWR)) >= 0)
679: break;
1.36 reyk 680: }
681: } else {
1.39 stevesk 682: debug("%s: invalid tunnel %u", __func__, tun);
1.37 reyk 683: return (-1);
684: }
685:
686: if (fd < 0) {
687: debug("%s: %s open failed: %s", __func__, name, strerror(errno));
688: return (-1);
1.36 reyk 689: }
1.37 reyk 690:
691: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
692:
693: /* Set the tunnel device operation mode */
694: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
695: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
696: goto failed;
697:
698: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
699: goto failed;
1.40 reyk 700:
701: /* Set interface mode */
702: ifr.ifr_flags &= ~IFF_UP;
703: if (mode == SSH_TUNMODE_ETHERNET)
1.37 reyk 704: ifr.ifr_flags |= IFF_LINK0;
1.40 reyk 705: else
706: ifr.ifr_flags &= ~IFF_LINK0;
707: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
708: goto failed;
709:
710: /* Bring interface up */
1.37 reyk 711: ifr.ifr_flags |= IFF_UP;
712: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
713: goto failed;
714:
715: close(sock);
716: return (fd);
717:
718: failed:
719: if (fd >= 0)
720: close(fd);
721: if (sock >= 0)
722: close(sock);
723: debug("%s: failed to set %s mode %d: %s", __func__, name,
724: mode, strerror(errno));
1.36 reyk 725: return (-1);
1.35 djm 726: }
727:
728: void
729: sanitise_stdfd(void)
730: {
1.41 djm 731: int nullfd, dupfd;
1.35 djm 732:
1.41 djm 733: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 734: fprintf(stderr, "Couldn't open /dev/null: %s\n",
735: strerror(errno));
1.35 djm 736: exit(1);
737: }
1.41 djm 738: while (++dupfd <= 2) {
739: /* Only clobber closed fds */
740: if (fcntl(dupfd, F_GETFL, 0) >= 0)
741: continue;
742: if (dup2(nullfd, dupfd) == -1) {
1.71 tobias 743: fprintf(stderr, "dup2: %s\n", strerror(errno));
1.35 djm 744: exit(1);
745: }
746: }
747: if (nullfd > 2)
748: close(nullfd);
1.1 markus 749: }
1.33 djm 750:
751: char *
1.52 djm 752: tohex(const void *vp, size_t l)
1.33 djm 753: {
1.52 djm 754: const u_char *p = (const u_char *)vp;
1.33 djm 755: char b[3], *r;
1.52 djm 756: size_t i, hl;
757:
758: if (l > 65536)
759: return xstrdup("tohex: length > 65536");
1.33 djm 760:
761: hl = l * 2 + 1;
1.49 djm 762: r = xcalloc(1, hl);
1.33 djm 763: for (i = 0; i < l; i++) {
1.52 djm 764: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 765: strlcat(r, b, hl);
766: }
767: return (r);
768: }
769:
1.52 djm 770: u_int64_t
771: get_u64(const void *vp)
772: {
773: const u_char *p = (const u_char *)vp;
774: u_int64_t v;
775:
776: v = (u_int64_t)p[0] << 56;
777: v |= (u_int64_t)p[1] << 48;
778: v |= (u_int64_t)p[2] << 40;
779: v |= (u_int64_t)p[3] << 32;
780: v |= (u_int64_t)p[4] << 24;
781: v |= (u_int64_t)p[5] << 16;
782: v |= (u_int64_t)p[6] << 8;
783: v |= (u_int64_t)p[7];
784:
785: return (v);
786: }
787:
788: u_int32_t
789: get_u32(const void *vp)
790: {
791: const u_char *p = (const u_char *)vp;
792: u_int32_t v;
793:
794: v = (u_int32_t)p[0] << 24;
795: v |= (u_int32_t)p[1] << 16;
796: v |= (u_int32_t)p[2] << 8;
797: v |= (u_int32_t)p[3];
798:
799: return (v);
800: }
801:
802: u_int16_t
803: get_u16(const void *vp)
804: {
805: const u_char *p = (const u_char *)vp;
806: u_int16_t v;
807:
808: v = (u_int16_t)p[0] << 8;
809: v |= (u_int16_t)p[1];
810:
811: return (v);
812: }
813:
814: void
815: put_u64(void *vp, u_int64_t v)
816: {
817: u_char *p = (u_char *)vp;
818:
819: p[0] = (u_char)(v >> 56) & 0xff;
820: p[1] = (u_char)(v >> 48) & 0xff;
821: p[2] = (u_char)(v >> 40) & 0xff;
822: p[3] = (u_char)(v >> 32) & 0xff;
823: p[4] = (u_char)(v >> 24) & 0xff;
824: p[5] = (u_char)(v >> 16) & 0xff;
825: p[6] = (u_char)(v >> 8) & 0xff;
826: p[7] = (u_char)v & 0xff;
827: }
828:
829: void
830: put_u32(void *vp, u_int32_t v)
831: {
832: u_char *p = (u_char *)vp;
833:
834: p[0] = (u_char)(v >> 24) & 0xff;
835: p[1] = (u_char)(v >> 16) & 0xff;
836: p[2] = (u_char)(v >> 8) & 0xff;
837: p[3] = (u_char)v & 0xff;
838: }
839:
840:
841: void
842: put_u16(void *vp, u_int16_t v)
843: {
844: u_char *p = (u_char *)vp;
845:
846: p[0] = (u_char)(v >> 8) & 0xff;
847: p[1] = (u_char)v & 0xff;
848: }
1.68 dtucker 849:
850: void
851: ms_subtract_diff(struct timeval *start, int *ms)
852: {
853: struct timeval diff, finish;
854:
855: gettimeofday(&finish, NULL);
856: timersub(&finish, start, &diff);
857: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
858: }
859:
860: void
861: ms_to_timeval(struct timeval *tv, int ms)
862: {
863: if (ms < 0)
864: ms = 0;
865: tv->tv_sec = ms / 1000;
866: tv->tv_usec = (ms % 1000) * 1000;
867: }
868:
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