Annotation of src/usr.bin/ssh/misc.c, Revision 1.104
1.104 ! djm 1: /* $OpenBSD: misc.c,v 1.103 2016/04/02 14:37:42 krw 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>
1.101 dtucker 30: #include <sys/time.h>
1.94 millert 31: #include <sys/un.h>
1.38 stevesk 32:
33: #include <net/if.h>
1.53 stevesk 34: #include <netinet/in.h>
1.83 djm 35: #include <netinet/ip.h>
1.44 stevesk 36: #include <netinet/tcp.h>
1.43 stevesk 37:
1.92 djm 38: #include <ctype.h>
1.58 stevesk 39: #include <errno.h>
1.55 stevesk 40: #include <fcntl.h>
1.66 dtucker 41: #include <netdb.h>
1.43 stevesk 42: #include <paths.h>
1.54 stevesk 43: #include <pwd.h>
1.96 deraadt 44: #include <limits.h>
1.57 stevesk 45: #include <stdarg.h>
1.63 stevesk 46: #include <stdio.h>
1.62 stevesk 47: #include <stdlib.h>
1.60 stevesk 48: #include <string.h>
1.59 stevesk 49: #include <unistd.h>
1.1 markus 50:
1.64 deraadt 51: #include "xmalloc.h"
1.1 markus 52: #include "misc.h"
53: #include "log.h"
1.56 dtucker 54: #include "ssh.h"
1.1 markus 55:
1.12 markus 56: /* remove newline at end of string */
1.1 markus 57: char *
58: chop(char *s)
59: {
60: char *t = s;
61: while (*t) {
1.13 deraadt 62: if (*t == '\n' || *t == '\r') {
1.1 markus 63: *t = '\0';
64: return s;
65: }
66: t++;
67: }
68: return s;
69:
70: }
71:
1.12 markus 72: /* set/unset filedescriptor to non-blocking */
1.24 djm 73: int
1.1 markus 74: set_nonblock(int fd)
75: {
76: int val;
1.8 markus 77:
1.103 krw 78: val = fcntl(fd, F_GETFL);
1.1 markus 79: if (val < 0) {
1.103 krw 80: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 81: return (-1);
1.1 markus 82: }
83: if (val & O_NONBLOCK) {
1.24 djm 84: debug3("fd %d is O_NONBLOCK", fd);
85: return (0);
1.1 markus 86: }
1.21 markus 87: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 88: val |= O_NONBLOCK;
1.24 djm 89: if (fcntl(fd, F_SETFL, val) == -1) {
90: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
91: strerror(errno));
92: return (-1);
93: }
94: return (0);
1.8 markus 95: }
96:
1.24 djm 97: int
1.8 markus 98: unset_nonblock(int fd)
99: {
100: int val;
101:
1.103 krw 102: val = fcntl(fd, F_GETFL);
1.8 markus 103: if (val < 0) {
1.103 krw 104: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 105: return (-1);
1.8 markus 106: }
107: if (!(val & O_NONBLOCK)) {
1.24 djm 108: debug3("fd %d is not O_NONBLOCK", fd);
109: return (0);
1.8 markus 110: }
1.10 markus 111: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 112: val &= ~O_NONBLOCK;
1.24 djm 113: if (fcntl(fd, F_SETFL, val) == -1) {
114: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 115: fd, strerror(errno));
1.24 djm 116: return (-1);
117: }
118: return (0);
1.66 dtucker 119: }
120:
121: const char *
122: ssh_gai_strerror(int gaierr)
123: {
1.91 djm 124: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 125: return strerror(errno);
126: return gai_strerror(gaierr);
1.15 stevesk 127: }
128:
129: /* disable nagle on socket */
130: void
131: set_nodelay(int fd)
132: {
1.17 stevesk 133: int opt;
134: socklen_t optlen;
1.15 stevesk 135:
1.16 stevesk 136: optlen = sizeof opt;
137: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 138: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 139: return;
140: }
141: if (opt == 1) {
142: debug2("fd %d is TCP_NODELAY", fd);
143: return;
144: }
145: opt = 1;
1.20 markus 146: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 147: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 148: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.72 reyk 149: }
150:
1.1 markus 151: /* Characters considered whitespace in strsep calls. */
152: #define WHITESPACE " \t\r\n"
1.46 dtucker 153: #define QUOTE "\""
1.1 markus 154:
1.12 markus 155: /* return next token in configuration line */
1.1 markus 156: char *
157: strdelim(char **s)
158: {
159: char *old;
160: int wspace = 0;
161:
162: if (*s == NULL)
163: return NULL;
164:
165: old = *s;
166:
1.46 dtucker 167: *s = strpbrk(*s, WHITESPACE QUOTE "=");
1.1 markus 168: if (*s == NULL)
169: return (old);
170:
1.46 dtucker 171: if (*s[0] == '\"') {
172: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
173: /* Find matching quote */
174: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
175: return (NULL); /* no matching quote */
176: } else {
177: *s[0] = '\0';
1.77 djm 178: *s += strspn(*s + 1, WHITESPACE) + 1;
1.46 dtucker 179: return (old);
180: }
181: }
182:
1.1 markus 183: /* Allow only one '=' to be skipped */
184: if (*s[0] == '=')
185: wspace = 1;
186: *s[0] = '\0';
187:
1.46 dtucker 188: /* Skip any extra whitespace after first token */
1.1 markus 189: *s += strspn(*s + 1, WHITESPACE) + 1;
190: if (*s[0] == '=' && !wspace)
191: *s += strspn(*s + 1, WHITESPACE) + 1;
192:
193: return (old);
1.2 markus 194: }
195:
196: struct passwd *
197: pwcopy(struct passwd *pw)
198: {
1.49 djm 199: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 200:
1.2 markus 201: copy->pw_name = xstrdup(pw->pw_name);
202: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 203: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 204: copy->pw_uid = pw->pw_uid;
205: copy->pw_gid = pw->pw_gid;
1.11 markus 206: copy->pw_expire = pw->pw_expire;
207: copy->pw_change = pw->pw_change;
1.2 markus 208: copy->pw_class = xstrdup(pw->pw_class);
209: copy->pw_dir = xstrdup(pw->pw_dir);
210: copy->pw_shell = xstrdup(pw->pw_shell);
211: return copy;
1.5 stevesk 212: }
213:
1.12 markus 214: /*
215: * Convert ASCII string to TCP/IP port number.
1.70 djm 216: * Port must be >=0 and <=65535.
217: * Return -1 if invalid.
1.12 markus 218: */
219: int
220: a2port(const char *s)
1.5 stevesk 221: {
1.70 djm 222: long long port;
223: const char *errstr;
1.5 stevesk 224:
1.70 djm 225: port = strtonum(s, 0, 65535, &errstr);
226: if (errstr != NULL)
227: return -1;
228: return (int)port;
1.9 stevesk 229: }
230:
1.36 reyk 231: int
232: a2tun(const char *s, int *remote)
233: {
234: const char *errstr = NULL;
235: char *sp, *ep;
236: int tun;
237:
238: if (remote != NULL) {
1.37 reyk 239: *remote = SSH_TUNID_ANY;
1.36 reyk 240: sp = xstrdup(s);
241: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 242: free(sp);
1.36 reyk 243: return (a2tun(s, NULL));
244: }
245: ep[0] = '\0'; ep++;
246: *remote = a2tun(ep, NULL);
247: tun = a2tun(sp, NULL);
1.89 djm 248: free(sp);
1.37 reyk 249: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 250: }
251:
252: if (strcasecmp(s, "any") == 0)
1.37 reyk 253: return (SSH_TUNID_ANY);
1.36 reyk 254:
1.37 reyk 255: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
256: if (errstr != NULL)
257: return (SSH_TUNID_ERR);
1.36 reyk 258:
259: return (tun);
260: }
261:
1.9 stevesk 262: #define SECONDS 1
263: #define MINUTES (SECONDS * 60)
264: #define HOURS (MINUTES * 60)
265: #define DAYS (HOURS * 24)
266: #define WEEKS (DAYS * 7)
267:
1.12 markus 268: /*
269: * Convert a time string into seconds; format is
270: * a sequence of:
271: * time[qualifier]
272: *
273: * Valid time qualifiers are:
274: * <none> seconds
275: * s|S seconds
276: * m|M minutes
277: * h|H hours
278: * d|D days
279: * w|W weeks
280: *
281: * Examples:
282: * 90m 90 minutes
283: * 1h30m 90 minutes
284: * 2d 2 days
285: * 1w 1 week
286: *
287: * Return -1 if time string is invalid.
288: */
289: long
290: convtime(const char *s)
1.9 stevesk 291: {
292: long total, secs;
293: const char *p;
294: char *endp;
295:
296: errno = 0;
297: total = 0;
298: p = s;
299:
300: if (p == NULL || *p == '\0')
301: return -1;
302:
303: while (*p) {
304: secs = strtol(p, &endp, 10);
305: if (p == endp ||
306: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
307: secs < 0)
308: return -1;
309:
310: switch (*endp++) {
311: case '\0':
312: endp--;
1.48 deraadt 313: break;
1.9 stevesk 314: case 's':
315: case 'S':
316: break;
317: case 'm':
318: case 'M':
319: secs *= MINUTES;
320: break;
321: case 'h':
322: case 'H':
323: secs *= HOURS;
324: break;
325: case 'd':
326: case 'D':
327: secs *= DAYS;
328: break;
329: case 'w':
330: case 'W':
331: secs *= WEEKS;
332: break;
333: default:
334: return -1;
335: }
336: total += secs;
337: if (total < 0)
338: return -1;
339: p = endp;
340: }
341:
342: return total;
1.56 dtucker 343: }
344:
345: /*
346: * Returns a standardized host+port identifier string.
347: * Caller must free returned string.
348: */
349: char *
350: put_host_port(const char *host, u_short port)
351: {
352: char *hoststr;
353:
354: if (port == 0 || port == SSH_DEFAULT_PORT)
355: return(xstrdup(host));
356: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0)
357: fatal("put_host_port: asprintf: %s", strerror(errno));
358: debug3("put_host_port: %s", hoststr);
359: return hoststr;
1.28 djm 360: }
361:
362: /*
363: * Search for next delimiter between hostnames/addresses and ports.
364: * Argument may be modified (for termination).
365: * Returns *cp if parsing succeeds.
366: * *cp is set to the start of the next delimiter, if one was found.
367: * If this is the last field, *cp is set to NULL.
368: */
369: char *
370: hpdelim(char **cp)
371: {
372: char *s, *old;
373:
374: if (cp == NULL || *cp == NULL)
375: return NULL;
376:
377: old = s = *cp;
378: if (*s == '[') {
379: if ((s = strchr(s, ']')) == NULL)
380: return NULL;
381: else
382: s++;
383: } else if ((s = strpbrk(s, ":/")) == NULL)
384: s = *cp + strlen(*cp); /* skip to end (see first case below) */
385:
386: switch (*s) {
387: case '\0':
388: *cp = NULL; /* no more fields*/
389: break;
1.29 deraadt 390:
1.28 djm 391: case ':':
392: case '/':
393: *s = '\0'; /* terminate */
394: *cp = s + 1;
395: break;
1.29 deraadt 396:
1.28 djm 397: default:
398: return NULL;
399: }
400:
401: return old;
1.6 mouring 402: }
403:
404: char *
405: cleanhostname(char *host)
406: {
407: if (*host == '[' && host[strlen(host) - 1] == ']') {
408: host[strlen(host) - 1] = '\0';
409: return (host + 1);
410: } else
411: return host;
412: }
413:
414: char *
415: colon(char *cp)
416: {
417: int flag = 0;
418:
419: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 420: return NULL;
1.6 mouring 421: if (*cp == '[')
422: flag = 1;
423:
424: for (; *cp; ++cp) {
425: if (*cp == '@' && *(cp+1) == '[')
426: flag = 1;
427: if (*cp == ']' && *(cp+1) == ':' && flag)
428: return (cp+1);
429: if (*cp == ':' && !flag)
430: return (cp);
431: if (*cp == '/')
1.76 djm 432: return NULL;
1.6 mouring 433: }
1.76 djm 434: return NULL;
1.7 mouring 435: }
436:
1.12 markus 437: /* function to assist building execv() arguments */
1.7 mouring 438: void
439: addargs(arglist *args, char *fmt, ...)
440: {
441: va_list ap;
1.42 djm 442: char *cp;
1.25 avsm 443: u_int nalloc;
1.42 djm 444: int r;
1.7 mouring 445:
446: va_start(ap, fmt);
1.42 djm 447: r = vasprintf(&cp, fmt, ap);
1.7 mouring 448: va_end(ap);
1.42 djm 449: if (r == -1)
450: fatal("addargs: argument too long");
1.7 mouring 451:
1.22 markus 452: nalloc = args->nalloc;
1.7 mouring 453: if (args->list == NULL) {
1.22 markus 454: nalloc = 32;
1.7 mouring 455: args->num = 0;
1.22 markus 456: } else if (args->num+2 >= nalloc)
457: nalloc *= 2;
1.7 mouring 458:
1.97 deraadt 459: args->list = xreallocarray(args->list, nalloc, sizeof(char *));
1.22 markus 460: args->nalloc = nalloc;
1.42 djm 461: args->list[args->num++] = cp;
1.7 mouring 462: args->list[args->num] = NULL;
1.42 djm 463: }
464:
465: void
466: replacearg(arglist *args, u_int which, char *fmt, ...)
467: {
468: va_list ap;
469: char *cp;
470: int r;
471:
472: va_start(ap, fmt);
473: r = vasprintf(&cp, fmt, ap);
474: va_end(ap);
475: if (r == -1)
476: fatal("replacearg: argument too long");
477:
478: if (which >= args->num)
479: fatal("replacearg: tried to replace invalid arg %d >= %d",
480: which, args->num);
1.89 djm 481: free(args->list[which]);
1.42 djm 482: args->list[which] = cp;
483: }
484:
485: void
486: freeargs(arglist *args)
487: {
488: u_int i;
489:
490: if (args->list != NULL) {
491: for (i = 0; i < args->num; i++)
1.89 djm 492: free(args->list[i]);
493: free(args->list);
1.42 djm 494: args->nalloc = args->num = 0;
495: args->list = NULL;
496: }
1.30 djm 497: }
498:
499: /*
500: * Expands tildes in the file name. Returns data allocated by xmalloc.
501: * Warning: this calls getpw*.
502: */
503: char *
504: tilde_expand_filename(const char *filename, uid_t uid)
505: {
1.87 tedu 506: const char *path, *sep;
507: char user[128], *ret;
1.30 djm 508: struct passwd *pw;
1.32 djm 509: u_int len, slash;
1.30 djm 510:
511: if (*filename != '~')
512: return (xstrdup(filename));
513: filename++;
514:
515: path = strchr(filename, '/');
516: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 517: slash = path - filename;
518: if (slash > sizeof(user) - 1)
1.30 djm 519: fatal("tilde_expand_filename: ~username too long");
1.32 djm 520: memcpy(user, filename, slash);
521: user[slash] = '\0';
1.30 djm 522: if ((pw = getpwnam(user)) == NULL)
523: fatal("tilde_expand_filename: No such user %s", user);
524: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 525: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 526:
527: /* Make sure directory has a trailing '/' */
528: len = strlen(pw->pw_dir);
1.88 tedu 529: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 530: sep = "/";
531: else
532: sep = "";
1.30 djm 533:
534: /* Skip leading '/' from specified path */
535: if (path != NULL)
536: filename = path + 1;
1.87 tedu 537:
1.96 deraadt 538: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 539: fatal("tilde_expand_filename: Path too long");
540:
1.87 tedu 541: return (ret);
1.31 djm 542: }
543:
544: /*
545: * Expand a string with a set of %[char] escapes. A number of escapes may be
546: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 547: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 548: * allocated by xmalloc.
549: */
550: char *
551: percent_expand(const char *string, ...)
552: {
553: #define EXPAND_MAX_KEYS 16
1.73 djm 554: u_int num_keys, i, j;
1.31 djm 555: struct {
556: const char *key;
557: const char *repl;
558: } keys[EXPAND_MAX_KEYS];
559: char buf[4096];
560: va_list ap;
561:
562: /* Gather keys */
563: va_start(ap, string);
564: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
565: keys[num_keys].key = va_arg(ap, char *);
566: if (keys[num_keys].key == NULL)
567: break;
568: keys[num_keys].repl = va_arg(ap, char *);
569: if (keys[num_keys].repl == NULL)
1.73 djm 570: fatal("%s: NULL replacement", __func__);
1.31 djm 571: }
1.73 djm 572: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
573: fatal("%s: too many keys", __func__);
1.31 djm 574: va_end(ap);
575:
576: /* Expand string */
577: *buf = '\0';
578: for (i = 0; *string != '\0'; string++) {
579: if (*string != '%') {
580: append:
581: buf[i++] = *string;
582: if (i >= sizeof(buf))
1.73 djm 583: fatal("%s: string too long", __func__);
1.31 djm 584: buf[i] = '\0';
585: continue;
586: }
587: string++;
1.73 djm 588: /* %% case */
1.31 djm 589: if (*string == '%')
590: goto append;
1.100 tobias 591: if (*string == '\0')
592: fatal("%s: invalid format", __func__);
1.31 djm 593: for (j = 0; j < num_keys; j++) {
594: if (strchr(keys[j].key, *string) != NULL) {
595: i = strlcat(buf, keys[j].repl, sizeof(buf));
596: if (i >= sizeof(buf))
1.73 djm 597: fatal("%s: string too long", __func__);
1.31 djm 598: break;
599: }
600: }
601: if (j >= num_keys)
1.73 djm 602: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 603: }
604: return (xstrdup(buf));
605: #undef EXPAND_MAX_KEYS
1.26 dtucker 606: }
607:
608: /*
609: * Read an entire line from a public key file into a static buffer, discarding
610: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
611: */
612: int
613: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
1.27 dtucker 614: u_long *lineno)
1.26 dtucker 615: {
616: while (fgets(buf, bufsz, f) != NULL) {
1.65 ray 617: if (buf[0] == '\0')
618: continue;
1.26 dtucker 619: (*lineno)++;
620: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
621: return 0;
622: } else {
1.27 dtucker 623: debug("%s: %s line %lu exceeds size limit", __func__,
624: filename, *lineno);
1.26 dtucker 625: /* discard remainder of line */
1.29 deraadt 626: while (fgetc(f) != '\n' && !feof(f))
1.26 dtucker 627: ; /* nothing */
628: }
629: }
630: return -1;
1.36 reyk 631: }
632:
633: int
1.37 reyk 634: tun_open(int tun, int mode)
1.36 reyk 635: {
1.37 reyk 636: struct ifreq ifr;
1.36 reyk 637: char name[100];
1.37 reyk 638: int fd = -1, sock;
1.99 sthen 639: const char *tunbase = "tun";
640:
641: if (mode == SSH_TUNMODE_ETHERNET)
642: tunbase = "tap";
1.36 reyk 643:
1.37 reyk 644: /* Open the tunnel device */
645: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 646: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 647: fd = open(name, O_RDWR);
648: } else if (tun == SSH_TUNID_ANY) {
649: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 650: snprintf(name, sizeof(name), "/dev/%s%d",
651: tunbase, tun);
1.37 reyk 652: if ((fd = open(name, O_RDWR)) >= 0)
653: break;
1.36 reyk 654: }
655: } else {
1.39 stevesk 656: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 657: return -1;
1.37 reyk 658: }
659:
660: if (fd < 0) {
1.98 djm 661: debug("%s: %s open: %s", __func__, name, strerror(errno));
662: return -1;
1.36 reyk 663: }
1.37 reyk 664:
665: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
666:
1.99 sthen 667: /* Bring interface up if it is not already */
668: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
669: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 670: goto failed;
671:
1.98 djm 672: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
673: debug("%s: get interface %s flags: %s", __func__,
674: ifr.ifr_name, strerror(errno));
1.37 reyk 675: goto failed;
1.98 djm 676: }
1.40 reyk 677:
1.98 djm 678: if (!(ifr.ifr_flags & IFF_UP)) {
679: ifr.ifr_flags |= IFF_UP;
680: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
681: debug("%s: activate interface %s: %s", __func__,
682: ifr.ifr_name, strerror(errno));
683: goto failed;
684: }
685: }
1.37 reyk 686:
687: close(sock);
1.98 djm 688: return fd;
1.37 reyk 689:
690: failed:
691: if (fd >= 0)
692: close(fd);
693: if (sock >= 0)
694: close(sock);
1.98 djm 695: return -1;
1.35 djm 696: }
697:
698: void
699: sanitise_stdfd(void)
700: {
1.41 djm 701: int nullfd, dupfd;
1.35 djm 702:
1.41 djm 703: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 704: fprintf(stderr, "Couldn't open /dev/null: %s\n",
705: strerror(errno));
1.35 djm 706: exit(1);
707: }
1.103 krw 708: while (++dupfd <= STDERR_FILENO) {
709: /* Only populate closed fds. */
710: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
711: if (dup2(nullfd, dupfd) == -1) {
712: fprintf(stderr, "dup2: %s\n", strerror(errno));
713: exit(1);
714: }
1.35 djm 715: }
716: }
1.103 krw 717: if (nullfd > STDERR_FILENO)
1.35 djm 718: close(nullfd);
1.1 markus 719: }
1.33 djm 720:
721: char *
1.52 djm 722: tohex(const void *vp, size_t l)
1.33 djm 723: {
1.52 djm 724: const u_char *p = (const u_char *)vp;
1.33 djm 725: char b[3], *r;
1.52 djm 726: size_t i, hl;
727:
728: if (l > 65536)
729: return xstrdup("tohex: length > 65536");
1.33 djm 730:
731: hl = l * 2 + 1;
1.49 djm 732: r = xcalloc(1, hl);
1.33 djm 733: for (i = 0; i < l; i++) {
1.52 djm 734: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 735: strlcat(r, b, hl);
736: }
737: return (r);
738: }
739:
1.52 djm 740: u_int64_t
741: get_u64(const void *vp)
742: {
743: const u_char *p = (const u_char *)vp;
744: u_int64_t v;
745:
746: v = (u_int64_t)p[0] << 56;
747: v |= (u_int64_t)p[1] << 48;
748: v |= (u_int64_t)p[2] << 40;
749: v |= (u_int64_t)p[3] << 32;
750: v |= (u_int64_t)p[4] << 24;
751: v |= (u_int64_t)p[5] << 16;
752: v |= (u_int64_t)p[6] << 8;
753: v |= (u_int64_t)p[7];
754:
755: return (v);
756: }
757:
758: u_int32_t
759: get_u32(const void *vp)
760: {
761: const u_char *p = (const u_char *)vp;
762: u_int32_t v;
763:
764: v = (u_int32_t)p[0] << 24;
765: v |= (u_int32_t)p[1] << 16;
766: v |= (u_int32_t)p[2] << 8;
767: v |= (u_int32_t)p[3];
768:
769: return (v);
770: }
771:
1.93 djm 772: u_int32_t
773: get_u32_le(const void *vp)
774: {
775: const u_char *p = (const u_char *)vp;
776: u_int32_t v;
777:
778: v = (u_int32_t)p[0];
779: v |= (u_int32_t)p[1] << 8;
780: v |= (u_int32_t)p[2] << 16;
781: v |= (u_int32_t)p[3] << 24;
782:
783: return (v);
784: }
785:
1.52 djm 786: u_int16_t
787: get_u16(const void *vp)
788: {
789: const u_char *p = (const u_char *)vp;
790: u_int16_t v;
791:
792: v = (u_int16_t)p[0] << 8;
793: v |= (u_int16_t)p[1];
794:
795: return (v);
796: }
797:
798: void
799: put_u64(void *vp, u_int64_t v)
800: {
801: u_char *p = (u_char *)vp;
802:
803: p[0] = (u_char)(v >> 56) & 0xff;
804: p[1] = (u_char)(v >> 48) & 0xff;
805: p[2] = (u_char)(v >> 40) & 0xff;
806: p[3] = (u_char)(v >> 32) & 0xff;
807: p[4] = (u_char)(v >> 24) & 0xff;
808: p[5] = (u_char)(v >> 16) & 0xff;
809: p[6] = (u_char)(v >> 8) & 0xff;
810: p[7] = (u_char)v & 0xff;
811: }
812:
813: void
814: put_u32(void *vp, u_int32_t v)
815: {
816: u_char *p = (u_char *)vp;
817:
818: p[0] = (u_char)(v >> 24) & 0xff;
819: p[1] = (u_char)(v >> 16) & 0xff;
820: p[2] = (u_char)(v >> 8) & 0xff;
821: p[3] = (u_char)v & 0xff;
822: }
823:
1.93 djm 824: void
825: put_u32_le(void *vp, u_int32_t v)
826: {
827: u_char *p = (u_char *)vp;
828:
829: p[0] = (u_char)v & 0xff;
830: p[1] = (u_char)(v >> 8) & 0xff;
831: p[2] = (u_char)(v >> 16) & 0xff;
832: p[3] = (u_char)(v >> 24) & 0xff;
833: }
1.52 djm 834:
835: void
836: put_u16(void *vp, u_int16_t v)
837: {
838: u_char *p = (u_char *)vp;
839:
840: p[0] = (u_char)(v >> 8) & 0xff;
841: p[1] = (u_char)v & 0xff;
842: }
1.68 dtucker 843:
844: void
845: ms_subtract_diff(struct timeval *start, int *ms)
846: {
847: struct timeval diff, finish;
848:
849: gettimeofday(&finish, NULL);
850: timersub(&finish, start, &diff);
851: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
852: }
853:
854: void
855: ms_to_timeval(struct timeval *tv, int ms)
856: {
857: if (ms < 0)
858: ms = 0;
859: tv->tv_sec = ms / 1000;
860: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 861: }
862:
863: time_t
864: monotime(void)
865: {
866: struct timespec ts;
867:
868: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
869: fatal("clock_gettime: %s", strerror(errno));
870:
871: return (ts.tv_sec);
1.102 dtucker 872: }
873:
874: double
875: monotime_double(void)
876: {
877: struct timespec ts;
878:
879: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
880: fatal("clock_gettime: %s", strerror(errno));
881:
882: return (ts.tv_sec + (double)ts.tv_nsec / 1000000000);
1.81 djm 883: }
884:
885: void
886: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
887: {
888: bw->buflen = buflen;
889: bw->rate = kbps;
890: bw->thresh = bw->rate;
891: bw->lamt = 0;
892: timerclear(&bw->bwstart);
893: timerclear(&bw->bwend);
894: }
895:
896: /* Callback from read/write loop to insert bandwidth-limiting delays */
897: void
898: bandwidth_limit(struct bwlimit *bw, size_t read_len)
899: {
900: u_int64_t waitlen;
901: struct timespec ts, rm;
902:
903: if (!timerisset(&bw->bwstart)) {
904: gettimeofday(&bw->bwstart, NULL);
905: return;
906: }
907:
908: bw->lamt += read_len;
909: if (bw->lamt < bw->thresh)
910: return;
911:
912: gettimeofday(&bw->bwend, NULL);
913: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
914: if (!timerisset(&bw->bwend))
915: return;
916:
917: bw->lamt *= 8;
918: waitlen = (double)1000000L * bw->lamt / bw->rate;
919:
920: bw->bwstart.tv_sec = waitlen / 1000000L;
921: bw->bwstart.tv_usec = waitlen % 1000000L;
922:
923: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
924: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
925:
926: /* Adjust the wait time */
927: if (bw->bwend.tv_sec) {
928: bw->thresh /= 2;
929: if (bw->thresh < bw->buflen / 4)
930: bw->thresh = bw->buflen / 4;
931: } else if (bw->bwend.tv_usec < 10000) {
932: bw->thresh *= 2;
933: if (bw->thresh > bw->buflen * 8)
934: bw->thresh = bw->buflen * 8;
935: }
936:
937: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
938: while (nanosleep(&ts, &rm) == -1) {
939: if (errno != EINTR)
940: break;
941: ts = rm;
942: }
943: }
944:
945: bw->lamt = 0;
946: gettimeofday(&bw->bwstart, NULL);
1.84 djm 947: }
948:
949: /* Make a template filename for mk[sd]temp() */
950: void
951: mktemp_proto(char *s, size_t len)
952: {
953: const char *tmpdir;
954: int r;
955:
956: if ((tmpdir = getenv("TMPDIR")) != NULL) {
957: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
958: if (r > 0 && (size_t)r < len)
959: return;
960: }
961: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
962: if (r < 0 || (size_t)r >= len)
963: fatal("%s: template string too short", __func__);
1.68 dtucker 964: }
1.83 djm 965:
966: static const struct {
967: const char *name;
968: int value;
969: } ipqos[] = {
970: { "af11", IPTOS_DSCP_AF11 },
971: { "af12", IPTOS_DSCP_AF12 },
972: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 973: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 974: { "af22", IPTOS_DSCP_AF22 },
975: { "af23", IPTOS_DSCP_AF23 },
976: { "af31", IPTOS_DSCP_AF31 },
977: { "af32", IPTOS_DSCP_AF32 },
978: { "af33", IPTOS_DSCP_AF33 },
979: { "af41", IPTOS_DSCP_AF41 },
980: { "af42", IPTOS_DSCP_AF42 },
981: { "af43", IPTOS_DSCP_AF43 },
982: { "cs0", IPTOS_DSCP_CS0 },
983: { "cs1", IPTOS_DSCP_CS1 },
984: { "cs2", IPTOS_DSCP_CS2 },
985: { "cs3", IPTOS_DSCP_CS3 },
986: { "cs4", IPTOS_DSCP_CS4 },
987: { "cs5", IPTOS_DSCP_CS5 },
988: { "cs6", IPTOS_DSCP_CS6 },
989: { "cs7", IPTOS_DSCP_CS7 },
990: { "ef", IPTOS_DSCP_EF },
991: { "lowdelay", IPTOS_LOWDELAY },
992: { "throughput", IPTOS_THROUGHPUT },
993: { "reliability", IPTOS_RELIABILITY },
994: { NULL, -1 }
995: };
996:
997: int
998: parse_ipqos(const char *cp)
999: {
1000: u_int i;
1001: char *ep;
1002: long val;
1003:
1004: if (cp == NULL)
1005: return -1;
1006: for (i = 0; ipqos[i].name != NULL; i++) {
1007: if (strcasecmp(cp, ipqos[i].name) == 0)
1008: return ipqos[i].value;
1009: }
1010: /* Try parsing as an integer */
1011: val = strtol(cp, &ep, 0);
1012: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1013: return -1;
1014: return val;
1015: }
1016:
1.85 stevesk 1017: const char *
1018: iptos2str(int iptos)
1019: {
1020: int i;
1021: static char iptos_str[sizeof "0xff"];
1022:
1023: for (i = 0; ipqos[i].name != NULL; i++) {
1024: if (ipqos[i].value == iptos)
1025: return ipqos[i].name;
1026: }
1027: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1028: return iptos_str;
1.92 djm 1029: }
1030:
1031: void
1032: lowercase(char *s)
1033: {
1034: for (; *s; s++)
1035: *s = tolower((u_char)*s);
1.94 millert 1036: }
1037:
1038: int
1039: unix_listener(const char *path, int backlog, int unlink_first)
1040: {
1041: struct sockaddr_un sunaddr;
1042: int saved_errno, sock;
1043:
1044: memset(&sunaddr, 0, sizeof(sunaddr));
1045: sunaddr.sun_family = AF_UNIX;
1046: if (strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1047: error("%s: \"%s\" too long for Unix domain socket", __func__,
1048: path);
1049: errno = ENAMETOOLONG;
1050: return -1;
1051: }
1052:
1053: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1054: if (sock < 0) {
1055: saved_errno = errno;
1056: error("socket: %.100s", strerror(errno));
1057: errno = saved_errno;
1058: return -1;
1059: }
1060: if (unlink_first == 1) {
1061: if (unlink(path) != 0 && errno != ENOENT)
1062: error("unlink(%s): %.100s", path, strerror(errno));
1063: }
1064: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1065: saved_errno = errno;
1066: error("bind: %.100s", strerror(errno));
1067: close(sock);
1068: error("%s: cannot bind to path: %s", __func__, path);
1069: errno = saved_errno;
1070: return -1;
1071: }
1072: if (listen(sock, backlog) < 0) {
1073: saved_errno = errno;
1074: error("listen: %.100s", strerror(errno));
1075: close(sock);
1076: unlink(path);
1077: error("%s: cannot listen on path: %s", __func__, path);
1078: errno = saved_errno;
1079: return -1;
1080: }
1081: return sock;
1.85 stevesk 1082: }
1.104 ! djm 1083:
! 1084: /*
! 1085: * Compares two strings that maybe be NULL. Returns non-zero if strings
! 1086: * are both NULL or are identical, returns zero otherwise.
! 1087: */
! 1088: static int
! 1089: strcmp_maybe_null(const char *a, const char *b)
! 1090: {
! 1091: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
! 1092: return 0;
! 1093: if (a != NULL && strcmp(a, b) != 0)
! 1094: return 0;
! 1095: return 1;
! 1096: }
! 1097:
! 1098: /*
! 1099: * Compare two forwards, returning non-zero if they are identical or
! 1100: * zero otherwise.
! 1101: */
! 1102: int
! 1103: forward_equals(const struct Forward *a, const struct Forward *b)
! 1104: {
! 1105: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
! 1106: return 0;
! 1107: if (a->listen_port != b->listen_port)
! 1108: return 0;
! 1109: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
! 1110: return 0;
! 1111: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
! 1112: return 0;
! 1113: if (a->connect_port != b->connect_port)
! 1114: return 0;
! 1115: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
! 1116: return 0;
! 1117: /* allocated_port and handle are not checked */
! 1118: return 1;
! 1119: }
! 1120:
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