Annotation of src/usr.bin/ssh/misc.c, Revision 1.74
1.74 ! stevesk 1: /* $OpenBSD: misc.c,v 1.73 2009/11/20 03:24:07 djm 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;
1.74 ! stevesk 261: }
! 262:
! 263: int
! 264: a2rdomain(const char *s)
! 265: {
! 266: long long rdomain;
! 267: const char *errstr;
! 268:
! 269: rdomain = strtonum(s, 0, RT_TABLEID_MAX, &errstr);
! 270: if (errstr != NULL)
! 271: return -1;
! 272: return (int)rdomain;
1.9 stevesk 273: }
274:
1.36 reyk 275: int
276: a2tun(const char *s, int *remote)
277: {
278: const char *errstr = NULL;
279: char *sp, *ep;
280: int tun;
281:
282: if (remote != NULL) {
1.37 reyk 283: *remote = SSH_TUNID_ANY;
1.36 reyk 284: sp = xstrdup(s);
285: if ((ep = strchr(sp, ':')) == NULL) {
286: xfree(sp);
287: return (a2tun(s, NULL));
288: }
289: ep[0] = '\0'; ep++;
290: *remote = a2tun(ep, NULL);
291: tun = a2tun(sp, NULL);
292: xfree(sp);
1.37 reyk 293: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 294: }
295:
296: if (strcasecmp(s, "any") == 0)
1.37 reyk 297: return (SSH_TUNID_ANY);
1.36 reyk 298:
1.37 reyk 299: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
300: if (errstr != NULL)
301: return (SSH_TUNID_ERR);
1.36 reyk 302:
303: return (tun);
304: }
305:
1.9 stevesk 306: #define SECONDS 1
307: #define MINUTES (SECONDS * 60)
308: #define HOURS (MINUTES * 60)
309: #define DAYS (HOURS * 24)
310: #define WEEKS (DAYS * 7)
311:
1.12 markus 312: /*
313: * Convert a time string into seconds; format is
314: * a sequence of:
315: * time[qualifier]
316: *
317: * Valid time qualifiers are:
318: * <none> seconds
319: * s|S seconds
320: * m|M minutes
321: * h|H hours
322: * d|D days
323: * w|W weeks
324: *
325: * Examples:
326: * 90m 90 minutes
327: * 1h30m 90 minutes
328: * 2d 2 days
329: * 1w 1 week
330: *
331: * Return -1 if time string is invalid.
332: */
333: long
334: convtime(const char *s)
1.9 stevesk 335: {
336: long total, secs;
337: const char *p;
338: char *endp;
339:
340: errno = 0;
341: total = 0;
342: p = s;
343:
344: if (p == NULL || *p == '\0')
345: return -1;
346:
347: while (*p) {
348: secs = strtol(p, &endp, 10);
349: if (p == endp ||
350: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
351: secs < 0)
352: return -1;
353:
354: switch (*endp++) {
355: case '\0':
356: endp--;
1.48 deraadt 357: break;
1.9 stevesk 358: case 's':
359: case 'S':
360: break;
361: case 'm':
362: case 'M':
363: secs *= MINUTES;
364: break;
365: case 'h':
366: case 'H':
367: secs *= HOURS;
368: break;
369: case 'd':
370: case 'D':
371: secs *= DAYS;
372: break;
373: case 'w':
374: case 'W':
375: secs *= WEEKS;
376: break;
377: default:
378: return -1;
379: }
380: total += secs;
381: if (total < 0)
382: return -1;
383: p = endp;
384: }
385:
386: return total;
1.56 dtucker 387: }
388:
389: /*
390: * Returns a standardized host+port identifier string.
391: * Caller must free returned string.
392: */
393: char *
394: put_host_port(const char *host, u_short port)
395: {
396: char *hoststr;
397:
398: if (port == 0 || port == SSH_DEFAULT_PORT)
399: return(xstrdup(host));
400: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
401: fatal("put_host_port: asprintf: %s", strerror(errno));
402: debug3("put_host_port: %s", hoststr);
403: return hoststr;
1.28 djm 404: }
405:
406: /*
407: * Search for next delimiter between hostnames/addresses and ports.
408: * Argument may be modified (for termination).
409: * Returns *cp if parsing succeeds.
410: * *cp is set to the start of the next delimiter, if one was found.
411: * If this is the last field, *cp is set to NULL.
412: */
413: char *
414: hpdelim(char **cp)
415: {
416: char *s, *old;
417:
418: if (cp == NULL || *cp == NULL)
419: return NULL;
420:
421: old = s = *cp;
422: if (*s == '[') {
423: if ((s = strchr(s, ']')) == NULL)
424: return NULL;
425: else
426: s++;
427: } else if ((s = strpbrk(s, ":/")) == NULL)
428: s = *cp + strlen(*cp); /* skip to end (see first case below) */
429:
430: switch (*s) {
431: case '\0':
432: *cp = NULL; /* no more fields*/
433: break;
1.29 deraadt 434:
1.28 djm 435: case ':':
436: case '/':
437: *s = '\0'; /* terminate */
438: *cp = s + 1;
439: break;
1.29 deraadt 440:
1.28 djm 441: default:
442: return NULL;
443: }
444:
445: return old;
1.6 mouring 446: }
447:
448: char *
449: cleanhostname(char *host)
450: {
451: if (*host == '[' && host[strlen(host) - 1] == ']') {
452: host[strlen(host) - 1] = '\0';
453: return (host + 1);
454: } else
455: return host;
456: }
457:
458: char *
459: colon(char *cp)
460: {
461: int flag = 0;
462:
463: if (*cp == ':') /* Leading colon is part of file name. */
464: return (0);
465: if (*cp == '[')
466: flag = 1;
467:
468: for (; *cp; ++cp) {
469: if (*cp == '@' && *(cp+1) == '[')
470: flag = 1;
471: if (*cp == ']' && *(cp+1) == ':' && flag)
472: return (cp+1);
473: if (*cp == ':' && !flag)
474: return (cp);
475: if (*cp == '/')
476: return (0);
477: }
478: return (0);
1.7 mouring 479: }
480:
1.12 markus 481: /* function to assist building execv() arguments */
1.7 mouring 482: void
483: addargs(arglist *args, char *fmt, ...)
484: {
485: va_list ap;
1.42 djm 486: char *cp;
1.25 avsm 487: u_int nalloc;
1.42 djm 488: int r;
1.7 mouring 489:
490: va_start(ap, fmt);
1.42 djm 491: r = vasprintf(&cp, fmt, ap);
1.7 mouring 492: va_end(ap);
1.42 djm 493: if (r == -1)
494: fatal("addargs: argument too long");
1.7 mouring 495:
1.22 markus 496: nalloc = args->nalloc;
1.7 mouring 497: if (args->list == NULL) {
1.22 markus 498: nalloc = 32;
1.7 mouring 499: args->num = 0;
1.22 markus 500: } else if (args->num+2 >= nalloc)
501: nalloc *= 2;
1.7 mouring 502:
1.50 djm 503: args->list = xrealloc(args->list, nalloc, sizeof(char *));
1.22 markus 504: args->nalloc = nalloc;
1.42 djm 505: args->list[args->num++] = cp;
1.7 mouring 506: args->list[args->num] = NULL;
1.42 djm 507: }
508:
509: void
510: replacearg(arglist *args, u_int which, char *fmt, ...)
511: {
512: va_list ap;
513: char *cp;
514: int r;
515:
516: va_start(ap, fmt);
517: r = vasprintf(&cp, fmt, ap);
518: va_end(ap);
519: if (r == -1)
520: fatal("replacearg: argument too long");
521:
522: if (which >= args->num)
523: fatal("replacearg: tried to replace invalid arg %d >= %d",
524: which, args->num);
525: xfree(args->list[which]);
526: args->list[which] = cp;
527: }
528:
529: void
530: freeargs(arglist *args)
531: {
532: u_int i;
533:
534: if (args->list != NULL) {
535: for (i = 0; i < args->num; i++)
536: xfree(args->list[i]);
537: xfree(args->list);
538: args->nalloc = args->num = 0;
539: args->list = NULL;
540: }
1.30 djm 541: }
542:
543: /*
544: * Expands tildes in the file name. Returns data allocated by xmalloc.
545: * Warning: this calls getpw*.
546: */
547: char *
548: tilde_expand_filename(const char *filename, uid_t uid)
549: {
550: const char *path;
551: char user[128], ret[MAXPATHLEN];
552: struct passwd *pw;
1.32 djm 553: u_int len, slash;
1.30 djm 554:
555: if (*filename != '~')
556: return (xstrdup(filename));
557: filename++;
558:
559: path = strchr(filename, '/');
560: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 561: slash = path - filename;
562: if (slash > sizeof(user) - 1)
1.30 djm 563: fatal("tilde_expand_filename: ~username too long");
1.32 djm 564: memcpy(user, filename, slash);
565: user[slash] = '\0';
1.30 djm 566: if ((pw = getpwnam(user)) == NULL)
567: fatal("tilde_expand_filename: No such user %s", user);
568: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 569: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 570:
571: if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret))
572: fatal("tilde_expand_filename: Path too long");
573:
574: /* Make sure directory has a trailing '/' */
575: len = strlen(pw->pw_dir);
576: if ((len == 0 || pw->pw_dir[len - 1] != '/') &&
577: strlcat(ret, "/", sizeof(ret)) >= sizeof(ret))
578: fatal("tilde_expand_filename: Path too long");
579:
580: /* Skip leading '/' from specified path */
581: if (path != NULL)
582: filename = path + 1;
583: if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret))
584: fatal("tilde_expand_filename: Path too long");
585:
586: return (xstrdup(ret));
1.31 djm 587: }
588:
589: /*
590: * Expand a string with a set of %[char] escapes. A number of escapes may be
591: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 592: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 593: * allocated by xmalloc.
594: */
595: char *
596: percent_expand(const char *string, ...)
597: {
598: #define EXPAND_MAX_KEYS 16
1.73 djm 599: u_int num_keys, i, j;
1.31 djm 600: struct {
601: const char *key;
602: const char *repl;
603: } keys[EXPAND_MAX_KEYS];
604: char buf[4096];
605: va_list ap;
606:
607: /* Gather keys */
608: va_start(ap, string);
609: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
610: keys[num_keys].key = va_arg(ap, char *);
611: if (keys[num_keys].key == NULL)
612: break;
613: keys[num_keys].repl = va_arg(ap, char *);
614: if (keys[num_keys].repl == NULL)
1.73 djm 615: fatal("%s: NULL replacement", __func__);
1.31 djm 616: }
1.73 djm 617: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
618: fatal("%s: too many keys", __func__);
1.31 djm 619: va_end(ap);
620:
621: /* Expand string */
622: *buf = '\0';
623: for (i = 0; *string != '\0'; string++) {
624: if (*string != '%') {
625: append:
626: buf[i++] = *string;
627: if (i >= sizeof(buf))
1.73 djm 628: fatal("%s: string too long", __func__);
1.31 djm 629: buf[i] = '\0';
630: continue;
631: }
632: string++;
1.73 djm 633: /* %% case */
1.31 djm 634: if (*string == '%')
635: goto append;
636: for (j = 0; j < num_keys; j++) {
637: if (strchr(keys[j].key, *string) != NULL) {
638: i = strlcat(buf, keys[j].repl, sizeof(buf));
639: if (i >= sizeof(buf))
1.73 djm 640: fatal("%s: string too long", __func__);
1.31 djm 641: break;
642: }
643: }
644: if (j >= num_keys)
1.73 djm 645: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 646: }
647: return (xstrdup(buf));
648: #undef EXPAND_MAX_KEYS
1.26 dtucker 649: }
650:
651: /*
652: * Read an entire line from a public key file into a static buffer, discarding
653: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
654: */
655: int
656: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
1.27 dtucker 657: u_long *lineno)
1.26 dtucker 658: {
659: while (fgets(buf, bufsz, f) != NULL) {
1.65 ray 660: if (buf[0] == '\0')
661: continue;
1.26 dtucker 662: (*lineno)++;
663: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
664: return 0;
665: } else {
1.27 dtucker 666: debug("%s: %s line %lu exceeds size limit", __func__,
667: filename, *lineno);
1.26 dtucker 668: /* discard remainder of line */
1.29 deraadt 669: while (fgetc(f) != '\n' && !feof(f))
1.26 dtucker 670: ; /* nothing */
671: }
672: }
673: return -1;
1.36 reyk 674: }
675:
676: int
1.37 reyk 677: tun_open(int tun, int mode)
1.36 reyk 678: {
1.37 reyk 679: struct ifreq ifr;
1.36 reyk 680: char name[100];
1.37 reyk 681: int fd = -1, sock;
1.36 reyk 682:
1.37 reyk 683: /* Open the tunnel device */
684: if (tun <= SSH_TUNID_MAX) {
1.36 reyk 685: snprintf(name, sizeof(name), "/dev/tun%d", tun);
1.37 reyk 686: fd = open(name, O_RDWR);
687: } else if (tun == SSH_TUNID_ANY) {
688: for (tun = 100; tun >= 0; tun--) {
689: snprintf(name, sizeof(name), "/dev/tun%d", tun);
690: if ((fd = open(name, O_RDWR)) >= 0)
691: break;
1.36 reyk 692: }
693: } else {
1.39 stevesk 694: debug("%s: invalid tunnel %u", __func__, tun);
1.37 reyk 695: return (-1);
696: }
697:
698: if (fd < 0) {
699: debug("%s: %s open failed: %s", __func__, name, strerror(errno));
700: return (-1);
1.36 reyk 701: }
1.37 reyk 702:
703: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
704:
705: /* Set the tunnel device operation mode */
706: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun);
707: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
708: goto failed;
709:
710: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)
711: goto failed;
1.40 reyk 712:
713: /* Set interface mode */
714: ifr.ifr_flags &= ~IFF_UP;
715: if (mode == SSH_TUNMODE_ETHERNET)
1.37 reyk 716: ifr.ifr_flags |= IFF_LINK0;
1.40 reyk 717: else
718: ifr.ifr_flags &= ~IFF_LINK0;
719: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
720: goto failed;
721:
722: /* Bring interface up */
1.37 reyk 723: ifr.ifr_flags |= IFF_UP;
724: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1)
725: goto failed;
726:
727: close(sock);
728: return (fd);
729:
730: failed:
731: if (fd >= 0)
732: close(fd);
733: if (sock >= 0)
734: close(sock);
735: debug("%s: failed to set %s mode %d: %s", __func__, name,
736: mode, strerror(errno));
1.36 reyk 737: return (-1);
1.35 djm 738: }
739:
740: void
741: sanitise_stdfd(void)
742: {
1.41 djm 743: int nullfd, dupfd;
1.35 djm 744:
1.41 djm 745: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 746: fprintf(stderr, "Couldn't open /dev/null: %s\n",
747: strerror(errno));
1.35 djm 748: exit(1);
749: }
1.41 djm 750: while (++dupfd <= 2) {
751: /* Only clobber closed fds */
752: if (fcntl(dupfd, F_GETFL, 0) >= 0)
753: continue;
754: if (dup2(nullfd, dupfd) == -1) {
1.71 tobias 755: fprintf(stderr, "dup2: %s\n", strerror(errno));
1.35 djm 756: exit(1);
757: }
758: }
759: if (nullfd > 2)
760: close(nullfd);
1.1 markus 761: }
1.33 djm 762:
763: char *
1.52 djm 764: tohex(const void *vp, size_t l)
1.33 djm 765: {
1.52 djm 766: const u_char *p = (const u_char *)vp;
1.33 djm 767: char b[3], *r;
1.52 djm 768: size_t i, hl;
769:
770: if (l > 65536)
771: return xstrdup("tohex: length > 65536");
1.33 djm 772:
773: hl = l * 2 + 1;
1.49 djm 774: r = xcalloc(1, hl);
1.33 djm 775: for (i = 0; i < l; i++) {
1.52 djm 776: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 777: strlcat(r, b, hl);
778: }
779: return (r);
780: }
781:
1.52 djm 782: u_int64_t
783: get_u64(const void *vp)
784: {
785: const u_char *p = (const u_char *)vp;
786: u_int64_t v;
787:
788: v = (u_int64_t)p[0] << 56;
789: v |= (u_int64_t)p[1] << 48;
790: v |= (u_int64_t)p[2] << 40;
791: v |= (u_int64_t)p[3] << 32;
792: v |= (u_int64_t)p[4] << 24;
793: v |= (u_int64_t)p[5] << 16;
794: v |= (u_int64_t)p[6] << 8;
795: v |= (u_int64_t)p[7];
796:
797: return (v);
798: }
799:
800: u_int32_t
801: get_u32(const void *vp)
802: {
803: const u_char *p = (const u_char *)vp;
804: u_int32_t v;
805:
806: v = (u_int32_t)p[0] << 24;
807: v |= (u_int32_t)p[1] << 16;
808: v |= (u_int32_t)p[2] << 8;
809: v |= (u_int32_t)p[3];
810:
811: return (v);
812: }
813:
814: u_int16_t
815: get_u16(const void *vp)
816: {
817: const u_char *p = (const u_char *)vp;
818: u_int16_t v;
819:
820: v = (u_int16_t)p[0] << 8;
821: v |= (u_int16_t)p[1];
822:
823: return (v);
824: }
825:
826: void
827: put_u64(void *vp, u_int64_t v)
828: {
829: u_char *p = (u_char *)vp;
830:
831: p[0] = (u_char)(v >> 56) & 0xff;
832: p[1] = (u_char)(v >> 48) & 0xff;
833: p[2] = (u_char)(v >> 40) & 0xff;
834: p[3] = (u_char)(v >> 32) & 0xff;
835: p[4] = (u_char)(v >> 24) & 0xff;
836: p[5] = (u_char)(v >> 16) & 0xff;
837: p[6] = (u_char)(v >> 8) & 0xff;
838: p[7] = (u_char)v & 0xff;
839: }
840:
841: void
842: put_u32(void *vp, u_int32_t v)
843: {
844: u_char *p = (u_char *)vp;
845:
846: p[0] = (u_char)(v >> 24) & 0xff;
847: p[1] = (u_char)(v >> 16) & 0xff;
848: p[2] = (u_char)(v >> 8) & 0xff;
849: p[3] = (u_char)v & 0xff;
850: }
851:
852:
853: void
854: put_u16(void *vp, u_int16_t v)
855: {
856: u_char *p = (u_char *)vp;
857:
858: p[0] = (u_char)(v >> 8) & 0xff;
859: p[1] = (u_char)v & 0xff;
860: }
1.68 dtucker 861:
862: void
863: ms_subtract_diff(struct timeval *start, int *ms)
864: {
865: struct timeval diff, finish;
866:
867: gettimeofday(&finish, NULL);
868: timersub(&finish, start, &diff);
869: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
870: }
871:
872: void
873: ms_to_timeval(struct timeval *tv, int ms)
874: {
875: if (ms < 0)
876: ms = 0;
877: tv->tv_sec = ms / 1000;
878: tv->tv_usec = (ms % 1000) * 1000;
879: }
880:
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