Annotation of src/usr.bin/ssh/misc.c, Revision 1.106
1.106 ! dtucker 1: /* $OpenBSD: misc.c,v 1.105 2016/07/15 00:24:30 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>
1.101 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;
1.105 djm 435: }
436:
437: /*
438: * Parse a [user@]host[:port] string.
439: * Caller must free returned user and host.
440: * Any of the pointer return arguments may be NULL (useful for syntax checking).
441: * If user was not specified then *userp will be set to NULL.
442: * If port was not specified then *portp will be -1.
443: * Returns 0 on success, -1 on failure.
444: */
445: int
446: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
447: {
448: char *sdup, *cp, *tmp;
449: char *user = NULL, *host = NULL;
450: int port = -1, ret = -1;
451:
452: if (userp != NULL)
453: *userp = NULL;
454: if (hostp != NULL)
455: *hostp = NULL;
456: if (portp != NULL)
457: *portp = -1;
458:
459: if ((sdup = tmp = strdup(s)) == NULL)
460: return -1;
461: /* Extract optional username */
462: if ((cp = strchr(tmp, '@')) != NULL) {
463: *cp = '\0';
464: if (*tmp == '\0')
465: goto out;
466: if ((user = strdup(tmp)) == NULL)
467: goto out;
468: tmp = cp + 1;
469: }
470: /* Extract mandatory hostname */
471: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
472: goto out;
473: host = xstrdup(cleanhostname(cp));
474: /* Convert and verify optional port */
475: if (tmp != NULL && *tmp != '\0') {
476: if ((port = a2port(tmp)) <= 0)
477: goto out;
478: }
479: /* Success */
480: if (userp != NULL) {
481: *userp = user;
482: user = NULL;
483: }
484: if (hostp != NULL) {
485: *hostp = host;
486: host = NULL;
487: }
488: if (portp != NULL)
489: *portp = port;
490: ret = 0;
491: out:
492: free(sdup);
493: free(user);
494: free(host);
495: return ret;
1.7 mouring 496: }
497:
1.12 markus 498: /* function to assist building execv() arguments */
1.7 mouring 499: void
500: addargs(arglist *args, char *fmt, ...)
501: {
502: va_list ap;
1.42 djm 503: char *cp;
1.25 avsm 504: u_int nalloc;
1.42 djm 505: int r;
1.7 mouring 506:
507: va_start(ap, fmt);
1.42 djm 508: r = vasprintf(&cp, fmt, ap);
1.7 mouring 509: va_end(ap);
1.42 djm 510: if (r == -1)
511: fatal("addargs: argument too long");
1.7 mouring 512:
1.22 markus 513: nalloc = args->nalloc;
1.7 mouring 514: if (args->list == NULL) {
1.22 markus 515: nalloc = 32;
1.7 mouring 516: args->num = 0;
1.22 markus 517: } else if (args->num+2 >= nalloc)
518: nalloc *= 2;
1.7 mouring 519:
1.97 deraadt 520: args->list = xreallocarray(args->list, nalloc, sizeof(char *));
1.22 markus 521: args->nalloc = nalloc;
1.42 djm 522: args->list[args->num++] = cp;
1.7 mouring 523: args->list[args->num] = NULL;
1.42 djm 524: }
525:
526: void
527: replacearg(arglist *args, u_int which, char *fmt, ...)
528: {
529: va_list ap;
530: char *cp;
531: int r;
532:
533: va_start(ap, fmt);
534: r = vasprintf(&cp, fmt, ap);
535: va_end(ap);
536: if (r == -1)
537: fatal("replacearg: argument too long");
538:
539: if (which >= args->num)
540: fatal("replacearg: tried to replace invalid arg %d >= %d",
541: which, args->num);
1.89 djm 542: free(args->list[which]);
1.42 djm 543: args->list[which] = cp;
544: }
545:
546: void
547: freeargs(arglist *args)
548: {
549: u_int i;
550:
551: if (args->list != NULL) {
552: for (i = 0; i < args->num; i++)
1.89 djm 553: free(args->list[i]);
554: free(args->list);
1.42 djm 555: args->nalloc = args->num = 0;
556: args->list = NULL;
557: }
1.30 djm 558: }
559:
560: /*
561: * Expands tildes in the file name. Returns data allocated by xmalloc.
562: * Warning: this calls getpw*.
563: */
564: char *
565: tilde_expand_filename(const char *filename, uid_t uid)
566: {
1.87 tedu 567: const char *path, *sep;
568: char user[128], *ret;
1.30 djm 569: struct passwd *pw;
1.32 djm 570: u_int len, slash;
1.30 djm 571:
572: if (*filename != '~')
573: return (xstrdup(filename));
574: filename++;
575:
576: path = strchr(filename, '/');
577: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 578: slash = path - filename;
579: if (slash > sizeof(user) - 1)
1.30 djm 580: fatal("tilde_expand_filename: ~username too long");
1.32 djm 581: memcpy(user, filename, slash);
582: user[slash] = '\0';
1.30 djm 583: if ((pw = getpwnam(user)) == NULL)
584: fatal("tilde_expand_filename: No such user %s", user);
585: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 586: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 587:
588: /* Make sure directory has a trailing '/' */
589: len = strlen(pw->pw_dir);
1.88 tedu 590: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 591: sep = "/";
592: else
593: sep = "";
1.30 djm 594:
595: /* Skip leading '/' from specified path */
596: if (path != NULL)
597: filename = path + 1;
1.87 tedu 598:
1.96 deraadt 599: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 600: fatal("tilde_expand_filename: Path too long");
601:
1.87 tedu 602: return (ret);
1.31 djm 603: }
604:
605: /*
606: * Expand a string with a set of %[char] escapes. A number of escapes may be
607: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 608: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 609: * allocated by xmalloc.
610: */
611: char *
612: percent_expand(const char *string, ...)
613: {
614: #define EXPAND_MAX_KEYS 16
1.73 djm 615: u_int num_keys, i, j;
1.31 djm 616: struct {
617: const char *key;
618: const char *repl;
619: } keys[EXPAND_MAX_KEYS];
620: char buf[4096];
621: va_list ap;
622:
623: /* Gather keys */
624: va_start(ap, string);
625: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
626: keys[num_keys].key = va_arg(ap, char *);
627: if (keys[num_keys].key == NULL)
628: break;
629: keys[num_keys].repl = va_arg(ap, char *);
630: if (keys[num_keys].repl == NULL)
1.73 djm 631: fatal("%s: NULL replacement", __func__);
1.31 djm 632: }
1.73 djm 633: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
634: fatal("%s: too many keys", __func__);
1.31 djm 635: va_end(ap);
636:
637: /* Expand string */
638: *buf = '\0';
639: for (i = 0; *string != '\0'; string++) {
640: if (*string != '%') {
641: append:
642: buf[i++] = *string;
643: if (i >= sizeof(buf))
1.73 djm 644: fatal("%s: string too long", __func__);
1.31 djm 645: buf[i] = '\0';
646: continue;
647: }
648: string++;
1.73 djm 649: /* %% case */
1.31 djm 650: if (*string == '%')
651: goto append;
1.100 tobias 652: if (*string == '\0')
653: fatal("%s: invalid format", __func__);
1.31 djm 654: for (j = 0; j < num_keys; j++) {
655: if (strchr(keys[j].key, *string) != NULL) {
656: i = strlcat(buf, keys[j].repl, sizeof(buf));
657: if (i >= sizeof(buf))
1.73 djm 658: fatal("%s: string too long", __func__);
1.31 djm 659: break;
660: }
661: }
662: if (j >= num_keys)
1.73 djm 663: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 664: }
665: return (xstrdup(buf));
666: #undef EXPAND_MAX_KEYS
1.26 dtucker 667: }
668:
669: /*
670: * Read an entire line from a public key file into a static buffer, discarding
671: * lines that exceed the buffer size. Returns 0 on success, -1 on failure.
672: */
673: int
674: read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz,
1.27 dtucker 675: u_long *lineno)
1.26 dtucker 676: {
677: while (fgets(buf, bufsz, f) != NULL) {
1.65 ray 678: if (buf[0] == '\0')
679: continue;
1.26 dtucker 680: (*lineno)++;
681: if (buf[strlen(buf) - 1] == '\n' || feof(f)) {
682: return 0;
683: } else {
1.27 dtucker 684: debug("%s: %s line %lu exceeds size limit", __func__,
685: filename, *lineno);
1.26 dtucker 686: /* discard remainder of line */
1.29 deraadt 687: while (fgetc(f) != '\n' && !feof(f))
1.26 dtucker 688: ; /* nothing */
689: }
690: }
691: return -1;
1.36 reyk 692: }
693:
694: int
1.37 reyk 695: tun_open(int tun, int mode)
1.36 reyk 696: {
1.37 reyk 697: struct ifreq ifr;
1.36 reyk 698: char name[100];
1.37 reyk 699: int fd = -1, sock;
1.99 sthen 700: const char *tunbase = "tun";
701:
702: if (mode == SSH_TUNMODE_ETHERNET)
703: tunbase = "tap";
1.36 reyk 704:
1.37 reyk 705: /* Open the tunnel device */
706: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 707: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 708: fd = open(name, O_RDWR);
709: } else if (tun == SSH_TUNID_ANY) {
710: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 711: snprintf(name, sizeof(name), "/dev/%s%d",
712: tunbase, tun);
1.37 reyk 713: if ((fd = open(name, O_RDWR)) >= 0)
714: break;
1.36 reyk 715: }
716: } else {
1.39 stevesk 717: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 718: return -1;
1.37 reyk 719: }
720:
721: if (fd < 0) {
1.98 djm 722: debug("%s: %s open: %s", __func__, name, strerror(errno));
723: return -1;
1.36 reyk 724: }
1.37 reyk 725:
726: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
727:
1.99 sthen 728: /* Bring interface up if it is not already */
729: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
730: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 731: goto failed;
732:
1.98 djm 733: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
734: debug("%s: get interface %s flags: %s", __func__,
735: ifr.ifr_name, strerror(errno));
1.37 reyk 736: goto failed;
1.98 djm 737: }
1.40 reyk 738:
1.98 djm 739: if (!(ifr.ifr_flags & IFF_UP)) {
740: ifr.ifr_flags |= IFF_UP;
741: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
742: debug("%s: activate interface %s: %s", __func__,
743: ifr.ifr_name, strerror(errno));
744: goto failed;
745: }
746: }
1.37 reyk 747:
748: close(sock);
1.98 djm 749: return fd;
1.37 reyk 750:
751: failed:
752: if (fd >= 0)
753: close(fd);
754: if (sock >= 0)
755: close(sock);
1.98 djm 756: return -1;
1.35 djm 757: }
758:
759: void
760: sanitise_stdfd(void)
761: {
1.41 djm 762: int nullfd, dupfd;
1.35 djm 763:
1.41 djm 764: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 765: fprintf(stderr, "Couldn't open /dev/null: %s\n",
766: strerror(errno));
1.35 djm 767: exit(1);
768: }
1.103 krw 769: while (++dupfd <= STDERR_FILENO) {
770: /* Only populate closed fds. */
771: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
772: if (dup2(nullfd, dupfd) == -1) {
773: fprintf(stderr, "dup2: %s\n", strerror(errno));
774: exit(1);
775: }
1.35 djm 776: }
777: }
1.103 krw 778: if (nullfd > STDERR_FILENO)
1.35 djm 779: close(nullfd);
1.1 markus 780: }
1.33 djm 781:
782: char *
1.52 djm 783: tohex(const void *vp, size_t l)
1.33 djm 784: {
1.52 djm 785: const u_char *p = (const u_char *)vp;
1.33 djm 786: char b[3], *r;
1.52 djm 787: size_t i, hl;
788:
789: if (l > 65536)
790: return xstrdup("tohex: length > 65536");
1.33 djm 791:
792: hl = l * 2 + 1;
1.49 djm 793: r = xcalloc(1, hl);
1.33 djm 794: for (i = 0; i < l; i++) {
1.52 djm 795: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 796: strlcat(r, b, hl);
797: }
798: return (r);
799: }
800:
1.52 djm 801: u_int64_t
802: get_u64(const void *vp)
803: {
804: const u_char *p = (const u_char *)vp;
805: u_int64_t v;
806:
807: v = (u_int64_t)p[0] << 56;
808: v |= (u_int64_t)p[1] << 48;
809: v |= (u_int64_t)p[2] << 40;
810: v |= (u_int64_t)p[3] << 32;
811: v |= (u_int64_t)p[4] << 24;
812: v |= (u_int64_t)p[5] << 16;
813: v |= (u_int64_t)p[6] << 8;
814: v |= (u_int64_t)p[7];
815:
816: return (v);
817: }
818:
819: u_int32_t
820: get_u32(const void *vp)
821: {
822: const u_char *p = (const u_char *)vp;
823: u_int32_t v;
824:
825: v = (u_int32_t)p[0] << 24;
826: v |= (u_int32_t)p[1] << 16;
827: v |= (u_int32_t)p[2] << 8;
828: v |= (u_int32_t)p[3];
829:
830: return (v);
831: }
832:
1.93 djm 833: u_int32_t
834: get_u32_le(const void *vp)
835: {
836: const u_char *p = (const u_char *)vp;
837: u_int32_t v;
838:
839: v = (u_int32_t)p[0];
840: v |= (u_int32_t)p[1] << 8;
841: v |= (u_int32_t)p[2] << 16;
842: v |= (u_int32_t)p[3] << 24;
843:
844: return (v);
845: }
846:
1.52 djm 847: u_int16_t
848: get_u16(const void *vp)
849: {
850: const u_char *p = (const u_char *)vp;
851: u_int16_t v;
852:
853: v = (u_int16_t)p[0] << 8;
854: v |= (u_int16_t)p[1];
855:
856: return (v);
857: }
858:
859: void
860: put_u64(void *vp, u_int64_t v)
861: {
862: u_char *p = (u_char *)vp;
863:
864: p[0] = (u_char)(v >> 56) & 0xff;
865: p[1] = (u_char)(v >> 48) & 0xff;
866: p[2] = (u_char)(v >> 40) & 0xff;
867: p[3] = (u_char)(v >> 32) & 0xff;
868: p[4] = (u_char)(v >> 24) & 0xff;
869: p[5] = (u_char)(v >> 16) & 0xff;
870: p[6] = (u_char)(v >> 8) & 0xff;
871: p[7] = (u_char)v & 0xff;
872: }
873:
874: void
875: put_u32(void *vp, u_int32_t v)
876: {
877: u_char *p = (u_char *)vp;
878:
879: p[0] = (u_char)(v >> 24) & 0xff;
880: p[1] = (u_char)(v >> 16) & 0xff;
881: p[2] = (u_char)(v >> 8) & 0xff;
882: p[3] = (u_char)v & 0xff;
883: }
884:
1.93 djm 885: void
886: put_u32_le(void *vp, u_int32_t v)
887: {
888: u_char *p = (u_char *)vp;
889:
890: p[0] = (u_char)v & 0xff;
891: p[1] = (u_char)(v >> 8) & 0xff;
892: p[2] = (u_char)(v >> 16) & 0xff;
893: p[3] = (u_char)(v >> 24) & 0xff;
894: }
1.52 djm 895:
896: void
897: put_u16(void *vp, u_int16_t v)
898: {
899: u_char *p = (u_char *)vp;
900:
901: p[0] = (u_char)(v >> 8) & 0xff;
902: p[1] = (u_char)v & 0xff;
903: }
1.68 dtucker 904:
905: void
906: ms_subtract_diff(struct timeval *start, int *ms)
907: {
908: struct timeval diff, finish;
909:
910: gettimeofday(&finish, NULL);
911: timersub(&finish, start, &diff);
912: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
913: }
914:
915: void
916: ms_to_timeval(struct timeval *tv, int ms)
917: {
918: if (ms < 0)
919: ms = 0;
920: tv->tv_sec = ms / 1000;
921: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 922: }
923:
924: time_t
925: monotime(void)
926: {
927: struct timespec ts;
928:
929: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
930: fatal("clock_gettime: %s", strerror(errno));
931:
932: return (ts.tv_sec);
1.102 dtucker 933: }
934:
935: double
936: monotime_double(void)
937: {
938: struct timespec ts;
939:
940: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
941: fatal("clock_gettime: %s", strerror(errno));
942:
943: return (ts.tv_sec + (double)ts.tv_nsec / 1000000000);
1.81 djm 944: }
945:
946: void
947: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
948: {
949: bw->buflen = buflen;
950: bw->rate = kbps;
951: bw->thresh = bw->rate;
952: bw->lamt = 0;
953: timerclear(&bw->bwstart);
954: timerclear(&bw->bwend);
955: }
956:
957: /* Callback from read/write loop to insert bandwidth-limiting delays */
958: void
959: bandwidth_limit(struct bwlimit *bw, size_t read_len)
960: {
961: u_int64_t waitlen;
962: struct timespec ts, rm;
963:
964: if (!timerisset(&bw->bwstart)) {
965: gettimeofday(&bw->bwstart, NULL);
966: return;
967: }
968:
969: bw->lamt += read_len;
970: if (bw->lamt < bw->thresh)
971: return;
972:
973: gettimeofday(&bw->bwend, NULL);
974: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
975: if (!timerisset(&bw->bwend))
976: return;
977:
978: bw->lamt *= 8;
979: waitlen = (double)1000000L * bw->lamt / bw->rate;
980:
981: bw->bwstart.tv_sec = waitlen / 1000000L;
982: bw->bwstart.tv_usec = waitlen % 1000000L;
983:
984: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
985: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
986:
987: /* Adjust the wait time */
988: if (bw->bwend.tv_sec) {
989: bw->thresh /= 2;
990: if (bw->thresh < bw->buflen / 4)
991: bw->thresh = bw->buflen / 4;
992: } else if (bw->bwend.tv_usec < 10000) {
993: bw->thresh *= 2;
994: if (bw->thresh > bw->buflen * 8)
995: bw->thresh = bw->buflen * 8;
996: }
997:
998: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
999: while (nanosleep(&ts, &rm) == -1) {
1000: if (errno != EINTR)
1001: break;
1002: ts = rm;
1003: }
1004: }
1005:
1006: bw->lamt = 0;
1007: gettimeofday(&bw->bwstart, NULL);
1.84 djm 1008: }
1009:
1010: /* Make a template filename for mk[sd]temp() */
1011: void
1012: mktemp_proto(char *s, size_t len)
1013: {
1014: const char *tmpdir;
1015: int r;
1016:
1017: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1018: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1019: if (r > 0 && (size_t)r < len)
1020: return;
1021: }
1022: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1023: if (r < 0 || (size_t)r >= len)
1024: fatal("%s: template string too short", __func__);
1.68 dtucker 1025: }
1.83 djm 1026:
1027: static const struct {
1028: const char *name;
1029: int value;
1030: } ipqos[] = {
1031: { "af11", IPTOS_DSCP_AF11 },
1032: { "af12", IPTOS_DSCP_AF12 },
1033: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1034: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1035: { "af22", IPTOS_DSCP_AF22 },
1036: { "af23", IPTOS_DSCP_AF23 },
1037: { "af31", IPTOS_DSCP_AF31 },
1038: { "af32", IPTOS_DSCP_AF32 },
1039: { "af33", IPTOS_DSCP_AF33 },
1040: { "af41", IPTOS_DSCP_AF41 },
1041: { "af42", IPTOS_DSCP_AF42 },
1042: { "af43", IPTOS_DSCP_AF43 },
1043: { "cs0", IPTOS_DSCP_CS0 },
1044: { "cs1", IPTOS_DSCP_CS1 },
1045: { "cs2", IPTOS_DSCP_CS2 },
1046: { "cs3", IPTOS_DSCP_CS3 },
1047: { "cs4", IPTOS_DSCP_CS4 },
1048: { "cs5", IPTOS_DSCP_CS5 },
1049: { "cs6", IPTOS_DSCP_CS6 },
1050: { "cs7", IPTOS_DSCP_CS7 },
1051: { "ef", IPTOS_DSCP_EF },
1052: { "lowdelay", IPTOS_LOWDELAY },
1053: { "throughput", IPTOS_THROUGHPUT },
1054: { "reliability", IPTOS_RELIABILITY },
1055: { NULL, -1 }
1056: };
1057:
1058: int
1059: parse_ipqos(const char *cp)
1060: {
1061: u_int i;
1062: char *ep;
1063: long val;
1064:
1065: if (cp == NULL)
1066: return -1;
1067: for (i = 0; ipqos[i].name != NULL; i++) {
1068: if (strcasecmp(cp, ipqos[i].name) == 0)
1069: return ipqos[i].value;
1070: }
1071: /* Try parsing as an integer */
1072: val = strtol(cp, &ep, 0);
1073: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1074: return -1;
1075: return val;
1076: }
1077:
1.85 stevesk 1078: const char *
1079: iptos2str(int iptos)
1080: {
1081: int i;
1082: static char iptos_str[sizeof "0xff"];
1083:
1084: for (i = 0; ipqos[i].name != NULL; i++) {
1085: if (ipqos[i].value == iptos)
1086: return ipqos[i].name;
1087: }
1088: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1089: return iptos_str;
1.92 djm 1090: }
1091:
1092: void
1093: lowercase(char *s)
1094: {
1095: for (; *s; s++)
1096: *s = tolower((u_char)*s);
1.94 millert 1097: }
1098:
1099: int
1100: unix_listener(const char *path, int backlog, int unlink_first)
1101: {
1102: struct sockaddr_un sunaddr;
1103: int saved_errno, sock;
1104:
1105: memset(&sunaddr, 0, sizeof(sunaddr));
1106: sunaddr.sun_family = AF_UNIX;
1107: if (strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1108: error("%s: \"%s\" too long for Unix domain socket", __func__,
1109: path);
1110: errno = ENAMETOOLONG;
1111: return -1;
1112: }
1113:
1114: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1115: if (sock < 0) {
1116: saved_errno = errno;
1117: error("socket: %.100s", strerror(errno));
1118: errno = saved_errno;
1119: return -1;
1120: }
1121: if (unlink_first == 1) {
1122: if (unlink(path) != 0 && errno != ENOENT)
1123: error("unlink(%s): %.100s", path, strerror(errno));
1124: }
1125: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1126: saved_errno = errno;
1127: error("bind: %.100s", strerror(errno));
1128: close(sock);
1129: error("%s: cannot bind to path: %s", __func__, path);
1130: errno = saved_errno;
1131: return -1;
1132: }
1133: if (listen(sock, backlog) < 0) {
1134: saved_errno = errno;
1135: error("listen: %.100s", strerror(errno));
1136: close(sock);
1137: unlink(path);
1138: error("%s: cannot listen on path: %s", __func__, path);
1139: errno = saved_errno;
1140: return -1;
1141: }
1142: return sock;
1.85 stevesk 1143: }
1.104 djm 1144:
1145: /*
1146: * Compares two strings that maybe be NULL. Returns non-zero if strings
1147: * are both NULL or are identical, returns zero otherwise.
1148: */
1149: static int
1150: strcmp_maybe_null(const char *a, const char *b)
1151: {
1152: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1153: return 0;
1154: if (a != NULL && strcmp(a, b) != 0)
1155: return 0;
1156: return 1;
1157: }
1158:
1159: /*
1160: * Compare two forwards, returning non-zero if they are identical or
1161: * zero otherwise.
1162: */
1163: int
1164: forward_equals(const struct Forward *a, const struct Forward *b)
1165: {
1166: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1167: return 0;
1168: if (a->listen_port != b->listen_port)
1169: return 0;
1170: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1171: return 0;
1172: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1173: return 0;
1174: if (a->connect_port != b->connect_port)
1175: return 0;
1176: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1177: return 0;
1178: /* allocated_port and handle are not checked */
1179: return 1;
1180: }
1181:
1.106 ! dtucker 1182: /* returns 1 if bind to specified port by specified user is permitted */
! 1183: int
! 1184: bind_permitted(int port, uid_t uid)
! 1185: {
! 1186: if (port < IPPORT_RESERVED && uid != 0)
! 1187: return 0;
! 1188: return 1;
! 1189: }
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