Annotation of src/usr.bin/ssh/misc.c, Revision 1.152
1.152 ! dtucker 1: /* $OpenBSD: misc.c,v 1.151 2020/05/29 09:02:44 dtucker Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.148 djm 4: * Copyright (c) 2005-2020 Damien Miller. All rights reserved.
5: * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
1.1 markus 6: *
1.148 djm 7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
1.1 markus 10: *
1.148 djm 11: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 markus 18: */
19:
1.148 djm 20:
1.64 deraadt 21: #include <sys/types.h>
1.45 stevesk 22: #include <sys/ioctl.h>
1.53 stevesk 23: #include <sys/socket.h>
1.112 djm 24: #include <sys/stat.h>
1.101 dtucker 25: #include <sys/time.h>
1.112 djm 26: #include <sys/wait.h>
1.94 millert 27: #include <sys/un.h>
1.38 stevesk 28:
29: #include <net/if.h>
1.53 stevesk 30: #include <netinet/in.h>
1.83 djm 31: #include <netinet/ip.h>
1.44 stevesk 32: #include <netinet/tcp.h>
1.133 naddy 33: #include <arpa/inet.h>
1.43 stevesk 34:
1.92 djm 35: #include <ctype.h>
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>
1.112 djm 41: #include <libgen.h>
1.96 deraadt 42: #include <limits.h>
1.136 djm 43: #include <poll.h>
1.112 djm 44: #include <signal.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"
1.112 djm 55: #include "sshbuf.h"
56: #include "ssherr.h"
1.1 markus 57:
1.12 markus 58: /* remove newline at end of string */
1.1 markus 59: char *
60: chop(char *s)
61: {
62: char *t = s;
63: while (*t) {
1.13 deraadt 64: if (*t == '\n' || *t == '\r') {
1.1 markus 65: *t = '\0';
66: return s;
67: }
68: t++;
69: }
70: return s;
71:
72: }
73:
1.12 markus 74: /* set/unset filedescriptor to non-blocking */
1.24 djm 75: int
1.1 markus 76: set_nonblock(int fd)
77: {
78: int val;
1.8 markus 79:
1.103 krw 80: val = fcntl(fd, F_GETFL);
1.139 deraadt 81: if (val == -1) {
1.103 krw 82: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 83: return (-1);
1.1 markus 84: }
85: if (val & O_NONBLOCK) {
1.24 djm 86: debug3("fd %d is O_NONBLOCK", fd);
87: return (0);
1.1 markus 88: }
1.21 markus 89: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 90: val |= O_NONBLOCK;
1.24 djm 91: if (fcntl(fd, F_SETFL, val) == -1) {
92: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
93: strerror(errno));
94: return (-1);
95: }
96: return (0);
1.8 markus 97: }
98:
1.24 djm 99: int
1.8 markus 100: unset_nonblock(int fd)
101: {
102: int val;
103:
1.103 krw 104: val = fcntl(fd, F_GETFL);
1.139 deraadt 105: if (val == -1) {
1.103 krw 106: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 107: return (-1);
1.8 markus 108: }
109: if (!(val & O_NONBLOCK)) {
1.24 djm 110: debug3("fd %d is not O_NONBLOCK", fd);
111: return (0);
1.8 markus 112: }
1.10 markus 113: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 114: val &= ~O_NONBLOCK;
1.24 djm 115: if (fcntl(fd, F_SETFL, val) == -1) {
116: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 117: fd, strerror(errno));
1.24 djm 118: return (-1);
119: }
120: return (0);
1.66 dtucker 121: }
122:
123: const char *
124: ssh_gai_strerror(int gaierr)
125: {
1.91 djm 126: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 127: return strerror(errno);
128: return gai_strerror(gaierr);
1.15 stevesk 129: }
130:
131: /* disable nagle on socket */
132: void
133: set_nodelay(int fd)
134: {
1.17 stevesk 135: int opt;
136: socklen_t optlen;
1.15 stevesk 137:
1.16 stevesk 138: optlen = sizeof opt;
139: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 140: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 141: return;
142: }
143: if (opt == 1) {
144: debug2("fd %d is TCP_NODELAY", fd);
145: return;
146: }
147: opt = 1;
1.20 markus 148: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 149: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 150: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.117 djm 151: }
152:
153: /* Allow local port reuse in TIME_WAIT */
154: int
155: set_reuseaddr(int fd)
156: {
157: int on = 1;
158:
159: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
160: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
161: return -1;
162: }
163: return 0;
164: }
165:
1.118 djm 166: /* Get/set routing domain */
167: char *
168: get_rdomain(int fd)
169: {
170: int rtable;
171: char *ret;
172: socklen_t len = sizeof(rtable);
173:
174: if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
175: error("Failed to get routing domain for fd %d: %s",
176: fd, strerror(errno));
177: return NULL;
178: }
179: xasprintf(&ret, "%d", rtable);
180: return ret;
181: }
182:
1.117 djm 183: int
184: set_rdomain(int fd, const char *name)
185: {
186: int rtable;
187: const char *errstr;
188:
189: if (name == NULL)
190: return 0; /* default table */
191:
192: rtable = (int)strtonum(name, 0, 255, &errstr);
193: if (errstr != NULL) {
194: /* Shouldn't happen */
195: error("Invalid routing domain \"%s\": %s", name, errstr);
196: return -1;
197: }
198: if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
199: &rtable, sizeof(rtable)) == -1) {
200: error("Failed to set routing domain %d on fd %d: %s",
201: rtable, fd, strerror(errno));
202: return -1;
203: }
1.136 djm 204: return 0;
205: }
206:
207: /*
1.143 dtucker 208: * Wait up to *timeoutp milliseconds for events on fd. Updates
1.136 djm 209: * *timeoutp with time remaining.
210: * Returns 0 if fd ready or -1 on timeout or error (see errno).
211: */
1.143 dtucker 212: static int
213: waitfd(int fd, int *timeoutp, short events)
1.136 djm 214: {
215: struct pollfd pfd;
216: struct timeval t_start;
217: int oerrno, r;
218:
219: monotime_tv(&t_start);
220: pfd.fd = fd;
1.143 dtucker 221: pfd.events = events;
1.136 djm 222: for (; *timeoutp >= 0;) {
223: r = poll(&pfd, 1, *timeoutp);
224: oerrno = errno;
225: ms_subtract_diff(&t_start, timeoutp);
226: errno = oerrno;
227: if (r > 0)
228: return 0;
229: else if (r == -1 && errno != EAGAIN)
230: return -1;
231: else if (r == 0)
232: break;
233: }
234: /* timeout */
235: errno = ETIMEDOUT;
236: return -1;
237: }
238:
239: /*
1.143 dtucker 240: * Wait up to *timeoutp milliseconds for fd to be readable. Updates
241: * *timeoutp with time remaining.
242: * Returns 0 if fd ready or -1 on timeout or error (see errno).
243: */
244: int
245: waitrfd(int fd, int *timeoutp) {
246: return waitfd(fd, timeoutp, POLLIN);
247: }
248:
249: /*
1.136 djm 250: * Attempt a non-blocking connect(2) to the specified address, waiting up to
251: * *timeoutp milliseconds for the connection to complete. If the timeout is
252: * <=0, then wait indefinitely.
253: *
254: * Returns 0 on success or -1 on failure.
255: */
256: int
257: timeout_connect(int sockfd, const struct sockaddr *serv_addr,
258: socklen_t addrlen, int *timeoutp)
259: {
260: int optval = 0;
261: socklen_t optlen = sizeof(optval);
262:
263: /* No timeout: just do a blocking connect() */
264: if (timeoutp == NULL || *timeoutp <= 0)
265: return connect(sockfd, serv_addr, addrlen);
266:
267: set_nonblock(sockfd);
268: if (connect(sockfd, serv_addr, addrlen) == 0) {
269: /* Succeeded already? */
270: unset_nonblock(sockfd);
271: return 0;
272: } else if (errno != EINPROGRESS)
273: return -1;
274:
1.143 dtucker 275: if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
1.136 djm 276: return -1;
277:
278: /* Completed or failed */
279: if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
280: debug("getsockopt: %s", strerror(errno));
281: return -1;
282: }
283: if (optval != 0) {
284: errno = optval;
285: return -1;
286: }
287: unset_nonblock(sockfd);
1.117 djm 288: return 0;
1.72 reyk 289: }
290:
1.1 markus 291: /* Characters considered whitespace in strsep calls. */
292: #define WHITESPACE " \t\r\n"
1.46 dtucker 293: #define QUOTE "\""
1.1 markus 294:
1.12 markus 295: /* return next token in configuration line */
1.129 djm 296: static char *
297: strdelim_internal(char **s, int split_equals)
1.1 markus 298: {
1.126 djm 299: char *old;
1.1 markus 300: int wspace = 0;
301:
302: if (*s == NULL)
303: return NULL;
304:
305: old = *s;
306:
1.129 djm 307: *s = strpbrk(*s,
308: split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
1.1 markus 309: if (*s == NULL)
310: return (old);
311:
1.46 dtucker 312: if (*s[0] == '\"') {
313: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
314: /* Find matching quote */
1.126 djm 315: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
316: return (NULL); /* no matching quote */
317: } else {
318: *s[0] = '\0';
319: *s += strspn(*s + 1, WHITESPACE) + 1;
320: return (old);
1.46 dtucker 321: }
322: }
323:
1.1 markus 324: /* Allow only one '=' to be skipped */
1.129 djm 325: if (split_equals && *s[0] == '=')
1.1 markus 326: wspace = 1;
327: *s[0] = '\0';
328:
1.46 dtucker 329: /* Skip any extra whitespace after first token */
1.1 markus 330: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 331: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 332: *s += strspn(*s + 1, WHITESPACE) + 1;
333:
334: return (old);
1.129 djm 335: }
336:
337: /*
338: * Return next token in configuration line; splts on whitespace or a
339: * single '=' character.
340: */
341: char *
342: strdelim(char **s)
343: {
344: return strdelim_internal(s, 1);
345: }
346:
347: /*
348: * Return next token in configuration line; splts on whitespace only.
349: */
350: char *
351: strdelimw(char **s)
352: {
353: return strdelim_internal(s, 0);
1.2 markus 354: }
355:
356: struct passwd *
357: pwcopy(struct passwd *pw)
358: {
1.49 djm 359: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 360:
1.2 markus 361: copy->pw_name = xstrdup(pw->pw_name);
362: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 363: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 364: copy->pw_uid = pw->pw_uid;
365: copy->pw_gid = pw->pw_gid;
1.11 markus 366: copy->pw_expire = pw->pw_expire;
367: copy->pw_change = pw->pw_change;
1.2 markus 368: copy->pw_class = xstrdup(pw->pw_class);
369: copy->pw_dir = xstrdup(pw->pw_dir);
370: copy->pw_shell = xstrdup(pw->pw_shell);
371: return copy;
1.5 stevesk 372: }
373:
1.12 markus 374: /*
375: * Convert ASCII string to TCP/IP port number.
1.70 djm 376: * Port must be >=0 and <=65535.
377: * Return -1 if invalid.
1.12 markus 378: */
379: int
380: a2port(const char *s)
1.5 stevesk 381: {
1.133 naddy 382: struct servent *se;
1.70 djm 383: long long port;
384: const char *errstr;
1.5 stevesk 385:
1.70 djm 386: port = strtonum(s, 0, 65535, &errstr);
1.133 naddy 387: if (errstr == NULL)
388: return (int)port;
389: if ((se = getservbyname(s, "tcp")) != NULL)
390: return ntohs(se->s_port);
391: return -1;
1.9 stevesk 392: }
393:
1.36 reyk 394: int
395: a2tun(const char *s, int *remote)
396: {
397: const char *errstr = NULL;
398: char *sp, *ep;
399: int tun;
400:
401: if (remote != NULL) {
1.37 reyk 402: *remote = SSH_TUNID_ANY;
1.36 reyk 403: sp = xstrdup(s);
404: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 405: free(sp);
1.36 reyk 406: return (a2tun(s, NULL));
407: }
408: ep[0] = '\0'; ep++;
409: *remote = a2tun(ep, NULL);
410: tun = a2tun(sp, NULL);
1.89 djm 411: free(sp);
1.37 reyk 412: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 413: }
414:
415: if (strcasecmp(s, "any") == 0)
1.37 reyk 416: return (SSH_TUNID_ANY);
1.36 reyk 417:
1.37 reyk 418: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
419: if (errstr != NULL)
420: return (SSH_TUNID_ERR);
1.36 reyk 421:
422: return (tun);
423: }
424:
1.9 stevesk 425: #define SECONDS 1
426: #define MINUTES (SECONDS * 60)
427: #define HOURS (MINUTES * 60)
428: #define DAYS (HOURS * 24)
429: #define WEEKS (DAYS * 7)
430:
1.12 markus 431: /*
432: * Convert a time string into seconds; format is
433: * a sequence of:
434: * time[qualifier]
435: *
436: * Valid time qualifiers are:
437: * <none> seconds
438: * s|S seconds
439: * m|M minutes
440: * h|H hours
441: * d|D days
442: * w|W weeks
443: *
444: * Examples:
445: * 90m 90 minutes
446: * 1h30m 90 minutes
447: * 2d 2 days
448: * 1w 1 week
449: *
450: * Return -1 if time string is invalid.
451: */
452: long
453: convtime(const char *s)
1.9 stevesk 454: {
1.149 dtucker 455: long total, secs, multiplier;
1.9 stevesk 456: const char *p;
457: char *endp;
458:
459: errno = 0;
460: total = 0;
461: p = s;
462:
463: if (p == NULL || *p == '\0')
464: return -1;
465:
466: while (*p) {
467: secs = strtol(p, &endp, 10);
468: if (p == endp ||
469: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
470: secs < 0)
471: return -1;
472:
1.149 dtucker 473: multiplier = 1;
1.9 stevesk 474: switch (*endp++) {
475: case '\0':
476: endp--;
1.48 deraadt 477: break;
1.9 stevesk 478: case 's':
479: case 'S':
480: break;
481: case 'm':
482: case 'M':
1.108 dtucker 483: multiplier = MINUTES;
1.9 stevesk 484: break;
485: case 'h':
486: case 'H':
1.108 dtucker 487: multiplier = HOURS;
1.9 stevesk 488: break;
489: case 'd':
490: case 'D':
1.108 dtucker 491: multiplier = DAYS;
1.9 stevesk 492: break;
493: case 'w':
494: case 'W':
1.108 dtucker 495: multiplier = WEEKS;
1.9 stevesk 496: break;
497: default:
498: return -1;
499: }
1.109 dtucker 500: if (secs >= LONG_MAX / multiplier)
1.108 dtucker 501: return -1;
502: secs *= multiplier;
1.109 dtucker 503: if (total >= LONG_MAX - secs)
1.108 dtucker 504: return -1;
1.9 stevesk 505: total += secs;
506: if (total < 0)
507: return -1;
508: p = endp;
509: }
510:
511: return total;
1.148 djm 512: }
513:
514: #define TF_BUFS 8
515: #define TF_LEN 9
516:
517: const char *
518: fmt_timeframe(time_t t)
519: {
520: char *buf;
521: static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */
522: static int idx = 0;
523: unsigned int sec, min, hrs, day;
524: unsigned long long week;
525:
526: buf = tfbuf[idx++];
527: if (idx == TF_BUFS)
528: idx = 0;
529:
530: week = t;
531:
532: sec = week % 60;
533: week /= 60;
534: min = week % 60;
535: week /= 60;
536: hrs = week % 24;
537: week /= 24;
538: day = week % 7;
539: week /= 7;
540:
541: if (week > 0)
542: snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
543: else if (day > 0)
544: snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
545: else
546: snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);
547:
548: return (buf);
1.56 dtucker 549: }
550:
551: /*
552: * Returns a standardized host+port identifier string.
553: * Caller must free returned string.
554: */
555: char *
556: put_host_port(const char *host, u_short port)
557: {
558: char *hoststr;
559:
560: if (port == 0 || port == SSH_DEFAULT_PORT)
561: return(xstrdup(host));
1.138 deraadt 562: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
1.56 dtucker 563: fatal("put_host_port: asprintf: %s", strerror(errno));
564: debug3("put_host_port: %s", hoststr);
565: return hoststr;
1.28 djm 566: }
567:
568: /*
569: * Search for next delimiter between hostnames/addresses and ports.
570: * Argument may be modified (for termination).
571: * Returns *cp if parsing succeeds.
1.114 millert 572: * *cp is set to the start of the next field, if one was found.
573: * The delimiter char, if present, is stored in delim.
1.28 djm 574: * If this is the last field, *cp is set to NULL.
575: */
1.137 dtucker 576: char *
1.114 millert 577: hpdelim2(char **cp, char *delim)
1.28 djm 578: {
579: char *s, *old;
580:
581: if (cp == NULL || *cp == NULL)
582: return NULL;
583:
584: old = s = *cp;
585: if (*s == '[') {
586: if ((s = strchr(s, ']')) == NULL)
587: return NULL;
588: else
589: s++;
590: } else if ((s = strpbrk(s, ":/")) == NULL)
591: s = *cp + strlen(*cp); /* skip to end (see first case below) */
592:
593: switch (*s) {
594: case '\0':
595: *cp = NULL; /* no more fields*/
596: break;
1.29 deraadt 597:
1.28 djm 598: case ':':
599: case '/':
1.114 millert 600: if (delim != NULL)
601: *delim = *s;
1.28 djm 602: *s = '\0'; /* terminate */
603: *cp = s + 1;
604: break;
1.29 deraadt 605:
1.28 djm 606: default:
607: return NULL;
608: }
609:
610: return old;
1.6 mouring 611: }
612:
613: char *
1.114 millert 614: hpdelim(char **cp)
615: {
616: return hpdelim2(cp, NULL);
617: }
618:
619: char *
1.6 mouring 620: cleanhostname(char *host)
621: {
622: if (*host == '[' && host[strlen(host) - 1] == ']') {
623: host[strlen(host) - 1] = '\0';
624: return (host + 1);
625: } else
626: return host;
627: }
628:
629: char *
630: colon(char *cp)
631: {
632: int flag = 0;
633:
634: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 635: return NULL;
1.6 mouring 636: if (*cp == '[')
637: flag = 1;
638:
639: for (; *cp; ++cp) {
640: if (*cp == '@' && *(cp+1) == '[')
641: flag = 1;
642: if (*cp == ']' && *(cp+1) == ':' && flag)
643: return (cp+1);
644: if (*cp == ':' && !flag)
645: return (cp);
646: if (*cp == '/')
1.76 djm 647: return NULL;
1.6 mouring 648: }
1.76 djm 649: return NULL;
1.105 djm 650: }
651:
652: /*
1.114 millert 653: * Parse a [user@]host:[path] string.
654: * Caller must free returned user, host and path.
655: * Any of the pointer return arguments may be NULL (useful for syntax checking).
656: * If user was not specified then *userp will be set to NULL.
657: * If host was not specified then *hostp will be set to NULL.
658: * If path was not specified then *pathp will be set to ".".
659: * Returns 0 on success, -1 on failure.
660: */
661: int
662: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
663: {
664: char *user = NULL, *host = NULL, *path = NULL;
665: char *sdup, *tmp;
666: int ret = -1;
667:
668: if (userp != NULL)
669: *userp = NULL;
670: if (hostp != NULL)
671: *hostp = NULL;
672: if (pathp != NULL)
673: *pathp = NULL;
674:
1.116 millert 675: sdup = xstrdup(s);
1.114 millert 676:
677: /* Check for remote syntax: [user@]host:[path] */
678: if ((tmp = colon(sdup)) == NULL)
679: goto out;
680:
681: /* Extract optional path */
682: *tmp++ = '\0';
683: if (*tmp == '\0')
684: tmp = ".";
685: path = xstrdup(tmp);
686:
687: /* Extract optional user and mandatory host */
688: tmp = strrchr(sdup, '@');
689: if (tmp != NULL) {
690: *tmp++ = '\0';
691: host = xstrdup(cleanhostname(tmp));
692: if (*sdup != '\0')
693: user = xstrdup(sdup);
694: } else {
695: host = xstrdup(cleanhostname(sdup));
696: user = NULL;
697: }
698:
699: /* Success */
700: if (userp != NULL) {
701: *userp = user;
702: user = NULL;
703: }
704: if (hostp != NULL) {
705: *hostp = host;
706: host = NULL;
1.116 millert 707: }
1.114 millert 708: if (pathp != NULL) {
709: *pathp = path;
710: path = NULL;
1.116 millert 711: }
1.114 millert 712: ret = 0;
713: out:
714: free(sdup);
715: free(user);
716: free(host);
717: free(path);
718: return ret;
719: }
720:
721: /*
1.105 djm 722: * Parse a [user@]host[:port] string.
723: * Caller must free returned user and host.
724: * Any of the pointer return arguments may be NULL (useful for syntax checking).
725: * If user was not specified then *userp will be set to NULL.
726: * If port was not specified then *portp will be -1.
727: * Returns 0 on success, -1 on failure.
728: */
729: int
730: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
731: {
732: char *sdup, *cp, *tmp;
733: char *user = NULL, *host = NULL;
734: int port = -1, ret = -1;
735:
736: if (userp != NULL)
737: *userp = NULL;
738: if (hostp != NULL)
739: *hostp = NULL;
740: if (portp != NULL)
741: *portp = -1;
742:
743: if ((sdup = tmp = strdup(s)) == NULL)
744: return -1;
745: /* Extract optional username */
1.114 millert 746: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 747: *cp = '\0';
748: if (*tmp == '\0')
749: goto out;
750: if ((user = strdup(tmp)) == NULL)
751: goto out;
752: tmp = cp + 1;
753: }
754: /* Extract mandatory hostname */
755: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
756: goto out;
757: host = xstrdup(cleanhostname(cp));
758: /* Convert and verify optional port */
759: if (tmp != NULL && *tmp != '\0') {
760: if ((port = a2port(tmp)) <= 0)
761: goto out;
762: }
763: /* Success */
764: if (userp != NULL) {
765: *userp = user;
766: user = NULL;
767: }
768: if (hostp != NULL) {
769: *hostp = host;
770: host = NULL;
771: }
772: if (portp != NULL)
773: *portp = port;
774: ret = 0;
775: out:
776: free(sdup);
777: free(user);
778: free(host);
779: return ret;
1.7 mouring 780: }
781:
1.114 millert 782: /*
783: * Converts a two-byte hex string to decimal.
784: * Returns the decimal value or -1 for invalid input.
785: */
786: static int
787: hexchar(const char *s)
788: {
789: unsigned char result[2];
790: int i;
791:
792: for (i = 0; i < 2; i++) {
793: if (s[i] >= '0' && s[i] <= '9')
794: result[i] = (unsigned char)(s[i] - '0');
795: else if (s[i] >= 'a' && s[i] <= 'f')
796: result[i] = (unsigned char)(s[i] - 'a') + 10;
797: else if (s[i] >= 'A' && s[i] <= 'F')
798: result[i] = (unsigned char)(s[i] - 'A') + 10;
799: else
800: return -1;
801: }
802: return (result[0] << 4) | result[1];
803: }
804:
805: /*
806: * Decode an url-encoded string.
807: * Returns a newly allocated string on success or NULL on failure.
808: */
809: static char *
810: urldecode(const char *src)
811: {
812: char *ret, *dst;
813: int ch;
814:
815: ret = xmalloc(strlen(src) + 1);
816: for (dst = ret; *src != '\0'; src++) {
817: switch (*src) {
818: case '+':
819: *dst++ = ' ';
820: break;
821: case '%':
822: if (!isxdigit((unsigned char)src[1]) ||
823: !isxdigit((unsigned char)src[2]) ||
824: (ch = hexchar(src + 1)) == -1) {
825: free(ret);
826: return NULL;
827: }
828: *dst++ = ch;
829: src += 2;
830: break;
831: default:
832: *dst++ = *src;
833: break;
834: }
835: }
836: *dst = '\0';
837:
838: return ret;
839: }
840:
841: /*
842: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
843: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
844: * Either user or path may be url-encoded (but not host or port).
845: * Caller must free returned user, host and path.
846: * Any of the pointer return arguments may be NULL (useful for syntax checking)
847: * but the scheme must always be specified.
848: * If user was not specified then *userp will be set to NULL.
849: * If port was not specified then *portp will be -1.
850: * If path was not specified then *pathp will be set to NULL.
851: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
852: */
853: int
854: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
855: int *portp, char **pathp)
856: {
857: char *uridup, *cp, *tmp, ch;
858: char *user = NULL, *host = NULL, *path = NULL;
859: int port = -1, ret = -1;
860: size_t len;
861:
862: len = strlen(scheme);
863: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
864: return 1;
865: uri += len + 3;
866:
867: if (userp != NULL)
868: *userp = NULL;
869: if (hostp != NULL)
870: *hostp = NULL;
871: if (portp != NULL)
872: *portp = -1;
873: if (pathp != NULL)
874: *pathp = NULL;
875:
876: uridup = tmp = xstrdup(uri);
877:
878: /* Extract optional ssh-info (username + connection params) */
879: if ((cp = strchr(tmp, '@')) != NULL) {
880: char *delim;
881:
882: *cp = '\0';
883: /* Extract username and connection params */
884: if ((delim = strchr(tmp, ';')) != NULL) {
885: /* Just ignore connection params for now */
886: *delim = '\0';
887: }
888: if (*tmp == '\0') {
889: /* Empty username */
890: goto out;
891: }
892: if ((user = urldecode(tmp)) == NULL)
893: goto out;
894: tmp = cp + 1;
895: }
896:
897: /* Extract mandatory hostname */
898: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
899: goto out;
900: host = xstrdup(cleanhostname(cp));
901: if (!valid_domain(host, 0, NULL))
902: goto out;
903:
904: if (tmp != NULL && *tmp != '\0') {
905: if (ch == ':') {
906: /* Convert and verify port. */
907: if ((cp = strchr(tmp, '/')) != NULL)
908: *cp = '\0';
909: if ((port = a2port(tmp)) <= 0)
910: goto out;
911: tmp = cp ? cp + 1 : NULL;
912: }
913: if (tmp != NULL && *tmp != '\0') {
914: /* Extract optional path */
915: if ((path = urldecode(tmp)) == NULL)
916: goto out;
917: }
918: }
919:
920: /* Success */
921: if (userp != NULL) {
922: *userp = user;
923: user = NULL;
924: }
925: if (hostp != NULL) {
926: *hostp = host;
927: host = NULL;
928: }
929: if (portp != NULL)
930: *portp = port;
931: if (pathp != NULL) {
932: *pathp = path;
933: path = NULL;
934: }
935: ret = 0;
936: out:
937: free(uridup);
938: free(user);
939: free(host);
940: free(path);
941: return ret;
942: }
943:
1.12 markus 944: /* function to assist building execv() arguments */
1.7 mouring 945: void
946: addargs(arglist *args, char *fmt, ...)
947: {
948: va_list ap;
1.42 djm 949: char *cp;
1.25 avsm 950: u_int nalloc;
1.42 djm 951: int r;
1.7 mouring 952:
953: va_start(ap, fmt);
1.42 djm 954: r = vasprintf(&cp, fmt, ap);
1.7 mouring 955: va_end(ap);
1.42 djm 956: if (r == -1)
957: fatal("addargs: argument too long");
1.7 mouring 958:
1.22 markus 959: nalloc = args->nalloc;
1.7 mouring 960: if (args->list == NULL) {
1.22 markus 961: nalloc = 32;
1.7 mouring 962: args->num = 0;
1.22 markus 963: } else if (args->num+2 >= nalloc)
964: nalloc *= 2;
1.7 mouring 965:
1.110 deraadt 966: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 967: args->nalloc = nalloc;
1.42 djm 968: args->list[args->num++] = cp;
1.7 mouring 969: args->list[args->num] = NULL;
1.42 djm 970: }
971:
972: void
973: replacearg(arglist *args, u_int which, char *fmt, ...)
974: {
975: va_list ap;
976: char *cp;
977: int r;
978:
979: va_start(ap, fmt);
980: r = vasprintf(&cp, fmt, ap);
981: va_end(ap);
982: if (r == -1)
983: fatal("replacearg: argument too long");
984:
985: if (which >= args->num)
986: fatal("replacearg: tried to replace invalid arg %d >= %d",
987: which, args->num);
1.89 djm 988: free(args->list[which]);
1.42 djm 989: args->list[which] = cp;
990: }
991:
992: void
993: freeargs(arglist *args)
994: {
995: u_int i;
996:
997: if (args->list != NULL) {
998: for (i = 0; i < args->num; i++)
1.89 djm 999: free(args->list[i]);
1000: free(args->list);
1.42 djm 1001: args->nalloc = args->num = 0;
1002: args->list = NULL;
1003: }
1.30 djm 1004: }
1005:
1006: /*
1007: * Expands tildes in the file name. Returns data allocated by xmalloc.
1008: * Warning: this calls getpw*.
1009: */
1010: char *
1011: tilde_expand_filename(const char *filename, uid_t uid)
1012: {
1.87 tedu 1013: const char *path, *sep;
1014: char user[128], *ret;
1.30 djm 1015: struct passwd *pw;
1.32 djm 1016: u_int len, slash;
1.30 djm 1017:
1018: if (*filename != '~')
1019: return (xstrdup(filename));
1020: filename++;
1021:
1022: path = strchr(filename, '/');
1023: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 1024: slash = path - filename;
1025: if (slash > sizeof(user) - 1)
1.30 djm 1026: fatal("tilde_expand_filename: ~username too long");
1.32 djm 1027: memcpy(user, filename, slash);
1028: user[slash] = '\0';
1.30 djm 1029: if ((pw = getpwnam(user)) == NULL)
1030: fatal("tilde_expand_filename: No such user %s", user);
1031: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 1032: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 1033:
1034: /* Make sure directory has a trailing '/' */
1035: len = strlen(pw->pw_dir);
1.88 tedu 1036: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 1037: sep = "/";
1038: else
1039: sep = "";
1.30 djm 1040:
1041: /* Skip leading '/' from specified path */
1042: if (path != NULL)
1043: filename = path + 1;
1.87 tedu 1044:
1.96 deraadt 1045: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 1046: fatal("tilde_expand_filename: Path too long");
1047:
1.87 tedu 1048: return (ret);
1.31 djm 1049: }
1050:
1051: /*
1.150 dtucker 1052: * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT}
1053: * substitutions. A number of escapes may be specified as
1054: * (char *escape_chars, char *replacement) pairs. The list must be terminated
1055: * by a NULL escape_char. Returns replaced string in memory allocated by
1056: * xmalloc which the caller must free.
1.31 djm 1057: */
1.150 dtucker 1058: static char *
1059: vdollar_percent_expand(int *parseerror, int dollar, int percent,
1060: const char *string, va_list ap)
1.31 djm 1061: {
1062: #define EXPAND_MAX_KEYS 16
1.150 dtucker 1063: u_int num_keys = 0, i;
1.31 djm 1064: struct {
1065: const char *key;
1066: const char *repl;
1067: } keys[EXPAND_MAX_KEYS];
1.140 djm 1068: struct sshbuf *buf;
1.150 dtucker 1069: int r, missingvar = 0;
1070: char *ret = NULL, *var, *varend, *val;
1071: size_t len;
1.140 djm 1072:
1073: if ((buf = sshbuf_new()) == NULL)
1074: fatal("%s: sshbuf_new failed", __func__);
1.150 dtucker 1075: if (parseerror == NULL)
1076: fatal("%s: null parseerror arg", __func__);
1077: *parseerror = 1;
1078:
1079: /* Gather keys if we're doing percent expansion. */
1080: if (percent) {
1081: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
1082: keys[num_keys].key = va_arg(ap, char *);
1083: if (keys[num_keys].key == NULL)
1084: break;
1085: keys[num_keys].repl = va_arg(ap, char *);
1086: if (keys[num_keys].repl == NULL)
1087: fatal("%s: NULL replacement for token %s", __func__, keys[num_keys].key);
1088: }
1089: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
1090: fatal("%s: too many keys", __func__);
1091: if (num_keys == 0)
1092: fatal("%s: percent expansion without token list",
1093: __func__);
1.31 djm 1094: }
1095:
1096: /* Expand string */
1097: for (i = 0; *string != '\0'; string++) {
1.150 dtucker 1098: /* Optionally process ${ENVIRONMENT} expansions. */
1099: if (dollar && string[0] == '$' && string[1] == '{') {
1100: string += 2; /* skip over '${' */
1101: if ((varend = strchr(string, '}')) == NULL) {
1102: error("%s: environment variable '%s' missing "
1103: "closing '}'", __func__, string);
1104: goto out;
1105: }
1106: len = varend - string;
1107: if (len == 0) {
1108: error("%s: zero-length environment variable",
1109: __func__);
1110: goto out;
1111: }
1112: var = xmalloc(len + 1);
1113: (void)strlcpy(var, string, len + 1);
1114: if ((val = getenv(var)) == NULL) {
1115: error("%s: env var ${%s} has no value",
1116: __func__, var);
1117: missingvar = 1;
1118: } else {
1119: debug3("%s: expand ${%s} -> '%s'", __func__,
1120: var, val);
1121: if ((r = sshbuf_put(buf, val, strlen(val))) !=0)
1122: fatal("%s: sshbuf_put: %s", __func__,
1123: ssh_err(r));
1124: }
1125: free(var);
1126: string += len;
1127: continue;
1128: }
1129:
1130: /*
1131: * Process percent expansions if we have a list of TOKENs.
1132: * If we're not doing percent expansion everything just gets
1133: * appended here.
1134: */
1135: if (*string != '%' || !percent) {
1.31 djm 1136: append:
1.140 djm 1137: if ((r = sshbuf_put_u8(buf, *string)) != 0) {
1138: fatal("%s: sshbuf_put_u8: %s",
1139: __func__, ssh_err(r));
1140: }
1.31 djm 1141: continue;
1142: }
1143: string++;
1.73 djm 1144: /* %% case */
1.31 djm 1145: if (*string == '%')
1146: goto append;
1.150 dtucker 1147: if (*string == '\0') {
1148: error("%s: invalid format", __func__);
1149: goto out;
1150: }
1.140 djm 1151: for (i = 0; i < num_keys; i++) {
1152: if (strchr(keys[i].key, *string) != NULL) {
1153: if ((r = sshbuf_put(buf, keys[i].repl,
1154: strlen(keys[i].repl))) != 0) {
1155: fatal("%s: sshbuf_put: %s",
1156: __func__, ssh_err(r));
1157: }
1.31 djm 1158: break;
1159: }
1160: }
1.150 dtucker 1161: if (i >= num_keys) {
1162: error("%s: unknown key %%%c", __func__, *string);
1163: goto out;
1164: }
1.31 djm 1165: }
1.150 dtucker 1166: if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL)
1.140 djm 1167: fatal("%s: sshbuf_dup_string failed", __func__);
1.150 dtucker 1168: *parseerror = 0;
1169: out:
1.140 djm 1170: sshbuf_free(buf);
1.150 dtucker 1171: return *parseerror ? NULL : ret;
1172: #undef EXPAND_MAX_KEYS
1173: }
1174:
1.152 ! dtucker 1175: /*
! 1176: * Expand only environment variables.
! 1177: * Note that although this function is variadic like the other similar
! 1178: * functions, any such arguments will be unused.
! 1179: */
! 1180:
1.150 dtucker 1181: char *
1.152 ! dtucker 1182: dollar_expand(int *parseerr, const char *string, ...)
1.150 dtucker 1183: {
1184: char *ret;
1185: int err;
1.152 ! dtucker 1186: va_list ap;
1.150 dtucker 1187:
1.152 ! dtucker 1188: va_start(ap, string);
! 1189: ret = vdollar_percent_expand(&err, 1, 0, string, ap);
! 1190: va_end(ap);
1.150 dtucker 1191: if (parseerr != NULL)
1192: *parseerr = err;
1193: return ret;
1194: }
1195:
1196: /*
1197: * Returns expanded string or NULL if a specified environment variable is
1198: * not defined, or calls fatal if the string is invalid.
1199: */
1200: char *
1201: percent_expand(const char *string, ...)
1202: {
1203: char *ret;
1204: int err;
1205: va_list ap;
1206:
1207: va_start(ap, string);
1208: ret = vdollar_percent_expand(&err, 0, 1, string, ap);
1209: va_end(ap);
1210: if (err)
1211: fatal("%s failed", __func__);
1212: return ret;
1213: }
1214:
1215: /*
1216: * Returns expanded string or NULL if a specified environment variable is
1217: * not defined, or calls fatal if the string is invalid.
1218: */
1219: char *
1220: percent_dollar_expand(const char *string, ...)
1221: {
1222: char *ret;
1223: int err;
1224: va_list ap;
1225:
1226: va_start(ap, string);
1227: ret = vdollar_percent_expand(&err, 1, 1, string, ap);
1228: va_end(ap);
1229: if (err)
1230: fatal("%s failed", __func__);
1.140 djm 1231: return ret;
1.36 reyk 1232: }
1233:
1234: int
1.115 djm 1235: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1236: {
1.37 reyk 1237: struct ifreq ifr;
1.36 reyk 1238: char name[100];
1.37 reyk 1239: int fd = -1, sock;
1.99 sthen 1240: const char *tunbase = "tun";
1241:
1.115 djm 1242: if (ifname != NULL)
1243: *ifname = NULL;
1244:
1.99 sthen 1245: if (mode == SSH_TUNMODE_ETHERNET)
1246: tunbase = "tap";
1.36 reyk 1247:
1.37 reyk 1248: /* Open the tunnel device */
1249: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1250: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1251: fd = open(name, O_RDWR);
1252: } else if (tun == SSH_TUNID_ANY) {
1253: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1254: snprintf(name, sizeof(name), "/dev/%s%d",
1255: tunbase, tun);
1.37 reyk 1256: if ((fd = open(name, O_RDWR)) >= 0)
1257: break;
1.36 reyk 1258: }
1259: } else {
1.39 stevesk 1260: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 1261: return -1;
1.37 reyk 1262: }
1263:
1.139 deraadt 1264: if (fd == -1) {
1.98 djm 1265: debug("%s: %s open: %s", __func__, name, strerror(errno));
1266: return -1;
1.36 reyk 1267: }
1.37 reyk 1268:
1269: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1270:
1.99 sthen 1271: /* Bring interface up if it is not already */
1272: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1273: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1274: goto failed;
1275:
1.98 djm 1276: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1277: debug("%s: get interface %s flags: %s", __func__,
1278: ifr.ifr_name, strerror(errno));
1.37 reyk 1279: goto failed;
1.98 djm 1280: }
1.40 reyk 1281:
1.98 djm 1282: if (!(ifr.ifr_flags & IFF_UP)) {
1283: ifr.ifr_flags |= IFF_UP;
1284: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1285: debug("%s: activate interface %s: %s", __func__,
1286: ifr.ifr_name, strerror(errno));
1287: goto failed;
1288: }
1289: }
1.115 djm 1290:
1291: if (ifname != NULL)
1292: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1293:
1294: close(sock);
1.98 djm 1295: return fd;
1.37 reyk 1296:
1297: failed:
1298: if (fd >= 0)
1299: close(fd);
1300: if (sock >= 0)
1301: close(sock);
1.98 djm 1302: return -1;
1.35 djm 1303: }
1304:
1305: void
1306: sanitise_stdfd(void)
1307: {
1.41 djm 1308: int nullfd, dupfd;
1.35 djm 1309:
1.41 djm 1310: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1311: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1312: strerror(errno));
1.35 djm 1313: exit(1);
1314: }
1.103 krw 1315: while (++dupfd <= STDERR_FILENO) {
1316: /* Only populate closed fds. */
1317: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1318: if (dup2(nullfd, dupfd) == -1) {
1319: fprintf(stderr, "dup2: %s\n", strerror(errno));
1320: exit(1);
1321: }
1.35 djm 1322: }
1323: }
1.103 krw 1324: if (nullfd > STDERR_FILENO)
1.35 djm 1325: close(nullfd);
1.1 markus 1326: }
1.33 djm 1327:
1328: char *
1.52 djm 1329: tohex(const void *vp, size_t l)
1.33 djm 1330: {
1.52 djm 1331: const u_char *p = (const u_char *)vp;
1.33 djm 1332: char b[3], *r;
1.52 djm 1333: size_t i, hl;
1334:
1335: if (l > 65536)
1336: return xstrdup("tohex: length > 65536");
1.33 djm 1337:
1338: hl = l * 2 + 1;
1.49 djm 1339: r = xcalloc(1, hl);
1.33 djm 1340: for (i = 0; i < l; i++) {
1.52 djm 1341: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1342: strlcat(r, b, hl);
1343: }
1344: return (r);
1345: }
1.145 djm 1346:
1347: /*
1348: * Extend string *sp by the specified format. If *sp is not NULL (or empty),
1349: * then the separator 'sep' will be prepended before the formatted arguments.
1350: * Extended strings are heap allocated.
1351: */
1352: void
1353: xextendf(char **sp, const char *sep, const char *fmt, ...)
1354: {
1355: va_list ap;
1356: char *tmp1, *tmp2;
1357:
1358: va_start(ap, fmt);
1359: xvasprintf(&tmp1, fmt, ap);
1360: va_end(ap);
1361:
1362: if (*sp == NULL || **sp == '\0') {
1363: free(*sp);
1364: *sp = tmp1;
1365: return;
1366: }
1367: xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1);
1368: free(tmp1);
1369: free(*sp);
1370: *sp = tmp2;
1371: }
1372:
1.33 djm 1373:
1.52 djm 1374: u_int64_t
1375: get_u64(const void *vp)
1376: {
1377: const u_char *p = (const u_char *)vp;
1378: u_int64_t v;
1379:
1380: v = (u_int64_t)p[0] << 56;
1381: v |= (u_int64_t)p[1] << 48;
1382: v |= (u_int64_t)p[2] << 40;
1383: v |= (u_int64_t)p[3] << 32;
1384: v |= (u_int64_t)p[4] << 24;
1385: v |= (u_int64_t)p[5] << 16;
1386: v |= (u_int64_t)p[6] << 8;
1387: v |= (u_int64_t)p[7];
1388:
1389: return (v);
1390: }
1391:
1392: u_int32_t
1393: get_u32(const void *vp)
1394: {
1395: const u_char *p = (const u_char *)vp;
1396: u_int32_t v;
1397:
1398: v = (u_int32_t)p[0] << 24;
1399: v |= (u_int32_t)p[1] << 16;
1400: v |= (u_int32_t)p[2] << 8;
1401: v |= (u_int32_t)p[3];
1402:
1403: return (v);
1404: }
1405:
1.93 djm 1406: u_int32_t
1407: get_u32_le(const void *vp)
1408: {
1409: const u_char *p = (const u_char *)vp;
1410: u_int32_t v;
1411:
1412: v = (u_int32_t)p[0];
1413: v |= (u_int32_t)p[1] << 8;
1414: v |= (u_int32_t)p[2] << 16;
1415: v |= (u_int32_t)p[3] << 24;
1416:
1417: return (v);
1418: }
1419:
1.52 djm 1420: u_int16_t
1421: get_u16(const void *vp)
1422: {
1423: const u_char *p = (const u_char *)vp;
1424: u_int16_t v;
1425:
1426: v = (u_int16_t)p[0] << 8;
1427: v |= (u_int16_t)p[1];
1428:
1429: return (v);
1430: }
1431:
1432: void
1433: put_u64(void *vp, u_int64_t v)
1434: {
1435: u_char *p = (u_char *)vp;
1436:
1437: p[0] = (u_char)(v >> 56) & 0xff;
1438: p[1] = (u_char)(v >> 48) & 0xff;
1439: p[2] = (u_char)(v >> 40) & 0xff;
1440: p[3] = (u_char)(v >> 32) & 0xff;
1441: p[4] = (u_char)(v >> 24) & 0xff;
1442: p[5] = (u_char)(v >> 16) & 0xff;
1443: p[6] = (u_char)(v >> 8) & 0xff;
1444: p[7] = (u_char)v & 0xff;
1445: }
1446:
1447: void
1448: put_u32(void *vp, u_int32_t v)
1449: {
1450: u_char *p = (u_char *)vp;
1451:
1452: p[0] = (u_char)(v >> 24) & 0xff;
1453: p[1] = (u_char)(v >> 16) & 0xff;
1454: p[2] = (u_char)(v >> 8) & 0xff;
1455: p[3] = (u_char)v & 0xff;
1456: }
1457:
1.93 djm 1458: void
1459: put_u32_le(void *vp, u_int32_t v)
1460: {
1461: u_char *p = (u_char *)vp;
1462:
1463: p[0] = (u_char)v & 0xff;
1464: p[1] = (u_char)(v >> 8) & 0xff;
1465: p[2] = (u_char)(v >> 16) & 0xff;
1466: p[3] = (u_char)(v >> 24) & 0xff;
1467: }
1.52 djm 1468:
1469: void
1470: put_u16(void *vp, u_int16_t v)
1471: {
1472: u_char *p = (u_char *)vp;
1473:
1474: p[0] = (u_char)(v >> 8) & 0xff;
1475: p[1] = (u_char)v & 0xff;
1476: }
1.68 dtucker 1477:
1478: void
1479: ms_subtract_diff(struct timeval *start, int *ms)
1480: {
1481: struct timeval diff, finish;
1482:
1.119 dtucker 1483: monotime_tv(&finish);
1484: timersub(&finish, start, &diff);
1.68 dtucker 1485: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1486: }
1487:
1488: void
1489: ms_to_timeval(struct timeval *tv, int ms)
1490: {
1491: if (ms < 0)
1492: ms = 0;
1493: tv->tv_sec = ms / 1000;
1494: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 1495: }
1496:
1.119 dtucker 1497: void
1498: monotime_ts(struct timespec *ts)
1499: {
1500: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1501: fatal("clock_gettime: %s", strerror(errno));
1502: }
1503:
1504: void
1505: monotime_tv(struct timeval *tv)
1506: {
1507: struct timespec ts;
1508:
1509: monotime_ts(&ts);
1510: tv->tv_sec = ts.tv_sec;
1511: tv->tv_usec = ts.tv_nsec / 1000;
1512: }
1513:
1.90 dtucker 1514: time_t
1515: monotime(void)
1516: {
1517: struct timespec ts;
1518:
1.119 dtucker 1519: monotime_ts(&ts);
1.90 dtucker 1520: return (ts.tv_sec);
1.102 dtucker 1521: }
1522:
1523: double
1524: monotime_double(void)
1525: {
1526: struct timespec ts;
1527:
1.119 dtucker 1528: monotime_ts(&ts);
1529: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1530: }
1531:
1532: void
1533: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1534: {
1535: bw->buflen = buflen;
1536: bw->rate = kbps;
1.135 dtucker 1537: bw->thresh = buflen;
1.81 djm 1538: bw->lamt = 0;
1539: timerclear(&bw->bwstart);
1540: timerclear(&bw->bwend);
1.135 dtucker 1541: }
1.81 djm 1542:
1543: /* Callback from read/write loop to insert bandwidth-limiting delays */
1544: void
1545: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1546: {
1547: u_int64_t waitlen;
1548: struct timespec ts, rm;
1549:
1.135 dtucker 1550: bw->lamt += read_len;
1.81 djm 1551: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1552: monotime_tv(&bw->bwstart);
1.81 djm 1553: return;
1554: }
1555: if (bw->lamt < bw->thresh)
1556: return;
1557:
1.119 dtucker 1558: monotime_tv(&bw->bwend);
1.81 djm 1559: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1560: if (!timerisset(&bw->bwend))
1561: return;
1562:
1563: bw->lamt *= 8;
1564: waitlen = (double)1000000L * bw->lamt / bw->rate;
1565:
1566: bw->bwstart.tv_sec = waitlen / 1000000L;
1567: bw->bwstart.tv_usec = waitlen % 1000000L;
1568:
1569: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1570: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1571:
1572: /* Adjust the wait time */
1573: if (bw->bwend.tv_sec) {
1574: bw->thresh /= 2;
1575: if (bw->thresh < bw->buflen / 4)
1576: bw->thresh = bw->buflen / 4;
1577: } else if (bw->bwend.tv_usec < 10000) {
1578: bw->thresh *= 2;
1579: if (bw->thresh > bw->buflen * 8)
1580: bw->thresh = bw->buflen * 8;
1581: }
1582:
1583: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1584: while (nanosleep(&ts, &rm) == -1) {
1585: if (errno != EINTR)
1586: break;
1587: ts = rm;
1588: }
1589: }
1590:
1591: bw->lamt = 0;
1.119 dtucker 1592: monotime_tv(&bw->bwstart);
1.84 djm 1593: }
1594:
1595: /* Make a template filename for mk[sd]temp() */
1596: void
1597: mktemp_proto(char *s, size_t len)
1598: {
1599: const char *tmpdir;
1600: int r;
1601:
1602: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1603: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1604: if (r > 0 && (size_t)r < len)
1605: return;
1606: }
1607: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1608: if (r < 0 || (size_t)r >= len)
1609: fatal("%s: template string too short", __func__);
1.68 dtucker 1610: }
1.83 djm 1611:
1612: static const struct {
1613: const char *name;
1614: int value;
1615: } ipqos[] = {
1.111 djm 1616: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1617: { "af11", IPTOS_DSCP_AF11 },
1618: { "af12", IPTOS_DSCP_AF12 },
1619: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1620: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1621: { "af22", IPTOS_DSCP_AF22 },
1622: { "af23", IPTOS_DSCP_AF23 },
1623: { "af31", IPTOS_DSCP_AF31 },
1624: { "af32", IPTOS_DSCP_AF32 },
1625: { "af33", IPTOS_DSCP_AF33 },
1626: { "af41", IPTOS_DSCP_AF41 },
1627: { "af42", IPTOS_DSCP_AF42 },
1628: { "af43", IPTOS_DSCP_AF43 },
1629: { "cs0", IPTOS_DSCP_CS0 },
1630: { "cs1", IPTOS_DSCP_CS1 },
1631: { "cs2", IPTOS_DSCP_CS2 },
1632: { "cs3", IPTOS_DSCP_CS3 },
1633: { "cs4", IPTOS_DSCP_CS4 },
1634: { "cs5", IPTOS_DSCP_CS5 },
1635: { "cs6", IPTOS_DSCP_CS6 },
1636: { "cs7", IPTOS_DSCP_CS7 },
1637: { "ef", IPTOS_DSCP_EF },
1.146 djm 1638: { "le", IPTOS_DSCP_LE },
1.83 djm 1639: { "lowdelay", IPTOS_LOWDELAY },
1640: { "throughput", IPTOS_THROUGHPUT },
1641: { "reliability", IPTOS_RELIABILITY },
1642: { NULL, -1 }
1643: };
1644:
1645: int
1646: parse_ipqos(const char *cp)
1647: {
1648: u_int i;
1649: char *ep;
1650: long val;
1651:
1652: if (cp == NULL)
1653: return -1;
1654: for (i = 0; ipqos[i].name != NULL; i++) {
1655: if (strcasecmp(cp, ipqos[i].name) == 0)
1656: return ipqos[i].value;
1657: }
1658: /* Try parsing as an integer */
1659: val = strtol(cp, &ep, 0);
1660: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1661: return -1;
1662: return val;
1663: }
1664:
1.85 stevesk 1665: const char *
1666: iptos2str(int iptos)
1667: {
1668: int i;
1669: static char iptos_str[sizeof "0xff"];
1670:
1671: for (i = 0; ipqos[i].name != NULL; i++) {
1672: if (ipqos[i].value == iptos)
1673: return ipqos[i].name;
1674: }
1675: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1676: return iptos_str;
1.92 djm 1677: }
1678:
1679: void
1680: lowercase(char *s)
1681: {
1682: for (; *s; s++)
1683: *s = tolower((u_char)*s);
1.94 millert 1684: }
1685:
1686: int
1687: unix_listener(const char *path, int backlog, int unlink_first)
1688: {
1689: struct sockaddr_un sunaddr;
1690: int saved_errno, sock;
1691:
1692: memset(&sunaddr, 0, sizeof(sunaddr));
1693: sunaddr.sun_family = AF_UNIX;
1.121 djm 1694: if (strlcpy(sunaddr.sun_path, path,
1695: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1696: error("%s: path \"%s\" too long for Unix domain socket",
1697: __func__, path);
1.94 millert 1698: errno = ENAMETOOLONG;
1699: return -1;
1700: }
1701:
1702: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1.139 deraadt 1703: if (sock == -1) {
1.94 millert 1704: saved_errno = errno;
1.121 djm 1705: error("%s: socket: %.100s", __func__, strerror(errno));
1.94 millert 1706: errno = saved_errno;
1707: return -1;
1708: }
1709: if (unlink_first == 1) {
1710: if (unlink(path) != 0 && errno != ENOENT)
1711: error("unlink(%s): %.100s", path, strerror(errno));
1712: }
1.139 deraadt 1713: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 millert 1714: saved_errno = errno;
1.121 djm 1715: error("%s: cannot bind to path %s: %s",
1716: __func__, path, strerror(errno));
1.122 djm 1717: close(sock);
1.94 millert 1718: errno = saved_errno;
1719: return -1;
1720: }
1.139 deraadt 1721: if (listen(sock, backlog) == -1) {
1.94 millert 1722: saved_errno = errno;
1.122 djm 1723: error("%s: cannot listen on path %s: %s",
1724: __func__, path, strerror(errno));
1.94 millert 1725: close(sock);
1726: unlink(path);
1727: errno = saved_errno;
1728: return -1;
1729: }
1730: return sock;
1.85 stevesk 1731: }
1.104 djm 1732:
1733: /*
1734: * Compares two strings that maybe be NULL. Returns non-zero if strings
1735: * are both NULL or are identical, returns zero otherwise.
1736: */
1737: static int
1738: strcmp_maybe_null(const char *a, const char *b)
1739: {
1740: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1741: return 0;
1742: if (a != NULL && strcmp(a, b) != 0)
1743: return 0;
1744: return 1;
1745: }
1746:
1747: /*
1748: * Compare two forwards, returning non-zero if they are identical or
1749: * zero otherwise.
1750: */
1751: int
1752: forward_equals(const struct Forward *a, const struct Forward *b)
1753: {
1754: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1755: return 0;
1756: if (a->listen_port != b->listen_port)
1757: return 0;
1758: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1759: return 0;
1760: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1761: return 0;
1762: if (a->connect_port != b->connect_port)
1763: return 0;
1764: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1765: return 0;
1766: /* allocated_port and handle are not checked */
1.107 dtucker 1767: return 1;
1768: }
1769:
1770: /* returns 1 if process is already daemonized, 0 otherwise */
1771: int
1772: daemonized(void)
1773: {
1774: int fd;
1775:
1776: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1777: close(fd);
1778: return 0; /* have controlling terminal */
1779: }
1780: if (getppid() != 1)
1781: return 0; /* parent is not init */
1782: if (getsid(0) != getpid())
1783: return 0; /* not session leader */
1784: debug3("already daemonized");
1.106 dtucker 1785: return 1;
1786: }
1.112 djm 1787:
1788:
1789: /*
1790: * Splits 's' into an argument vector. Handles quoted string and basic
1791: * escape characters (\\, \", \'). Caller must free the argument vector
1792: * and its members.
1793: */
1794: int
1795: argv_split(const char *s, int *argcp, char ***argvp)
1796: {
1797: int r = SSH_ERR_INTERNAL_ERROR;
1798: int argc = 0, quote, i, j;
1799: char *arg, **argv = xcalloc(1, sizeof(*argv));
1800:
1801: *argvp = NULL;
1802: *argcp = 0;
1803:
1804: for (i = 0; s[i] != '\0'; i++) {
1805: /* Skip leading whitespace */
1806: if (s[i] == ' ' || s[i] == '\t')
1807: continue;
1808:
1809: /* Start of a token */
1810: quote = 0;
1811: if (s[i] == '\\' &&
1812: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1813: i++;
1814: else if (s[i] == '\'' || s[i] == '"')
1815: quote = s[i++];
1816:
1817: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1818: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1819: argv[argc] = NULL;
1820:
1821: /* Copy the token in, removing escapes */
1822: for (j = 0; s[i] != '\0'; i++) {
1823: if (s[i] == '\\') {
1824: if (s[i + 1] == '\'' ||
1825: s[i + 1] == '\"' ||
1826: s[i + 1] == '\\') {
1827: i++; /* Skip '\' */
1828: arg[j++] = s[i];
1829: } else {
1830: /* Unrecognised escape */
1831: arg[j++] = s[i];
1832: }
1833: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1834: break; /* done */
1835: else if (quote != 0 && s[i] == quote)
1836: break; /* done */
1837: else
1838: arg[j++] = s[i];
1839: }
1840: if (s[i] == '\0') {
1841: if (quote != 0) {
1842: /* Ran out of string looking for close quote */
1843: r = SSH_ERR_INVALID_FORMAT;
1844: goto out;
1845: }
1846: break;
1847: }
1848: }
1849: /* Success */
1850: *argcp = argc;
1851: *argvp = argv;
1852: argc = 0;
1853: argv = NULL;
1854: r = 0;
1855: out:
1856: if (argc != 0 && argv != NULL) {
1857: for (i = 0; i < argc; i++)
1858: free(argv[i]);
1859: free(argv);
1860: }
1861: return r;
1862: }
1863:
1864: /*
1865: * Reassemble an argument vector into a string, quoting and escaping as
1866: * necessary. Caller must free returned string.
1867: */
1868: char *
1869: argv_assemble(int argc, char **argv)
1870: {
1871: int i, j, ws, r;
1872: char c, *ret;
1873: struct sshbuf *buf, *arg;
1874:
1875: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1876: fatal("%s: sshbuf_new failed", __func__);
1877:
1878: for (i = 0; i < argc; i++) {
1879: ws = 0;
1880: sshbuf_reset(arg);
1881: for (j = 0; argv[i][j] != '\0'; j++) {
1882: r = 0;
1883: c = argv[i][j];
1884: switch (c) {
1885: case ' ':
1886: case '\t':
1887: ws = 1;
1888: r = sshbuf_put_u8(arg, c);
1889: break;
1890: case '\\':
1891: case '\'':
1892: case '"':
1893: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1894: break;
1895: /* FALLTHROUGH */
1896: default:
1897: r = sshbuf_put_u8(arg, c);
1898: break;
1899: }
1900: if (r != 0)
1901: fatal("%s: sshbuf_put_u8: %s",
1902: __func__, ssh_err(r));
1903: }
1904: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1905: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1906: (r = sshbuf_putb(buf, arg)) != 0 ||
1907: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1908: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1909: }
1910: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1911: fatal("%s: malloc failed", __func__);
1912: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1913: ret[sshbuf_len(buf)] = '\0';
1914: sshbuf_free(buf);
1915: sshbuf_free(arg);
1916: return ret;
1917: }
1918:
1919: /* Returns 0 if pid exited cleanly, non-zero otherwise */
1920: int
1.113 djm 1921: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 1922: {
1923: int status;
1924:
1925: while (waitpid(pid, &status, 0) == -1) {
1926: if (errno != EINTR) {
1927: error("%s: waitpid: %s", tag, strerror(errno));
1928: return -1;
1929: }
1930: }
1931: if (WIFSIGNALED(status)) {
1932: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1933: return -1;
1934: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 1935: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1936: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 1937: return -1;
1938: }
1939: return 0;
1940: }
1941:
1942: /*
1943: * Check a given path for security. This is defined as all components
1944: * of the path to the file must be owned by either the owner of
1945: * of the file or root and no directories must be group or world writable.
1946: *
1947: * XXX Should any specific check be done for sym links ?
1948: *
1949: * Takes a file name, its stat information (preferably from fstat() to
1950: * avoid races), the uid of the expected owner, their home directory and an
1951: * error buffer plus max size as arguments.
1952: *
1953: * Returns 0 on success and -1 on failure
1954: */
1955: int
1956: safe_path(const char *name, struct stat *stp, const char *pw_dir,
1957: uid_t uid, char *err, size_t errlen)
1958: {
1959: char buf[PATH_MAX], homedir[PATH_MAX];
1960: char *cp;
1961: int comparehome = 0;
1962: struct stat st;
1963:
1964: if (realpath(name, buf) == NULL) {
1965: snprintf(err, errlen, "realpath %s failed: %s", name,
1966: strerror(errno));
1967: return -1;
1968: }
1969: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1970: comparehome = 1;
1971:
1972: if (!S_ISREG(stp->st_mode)) {
1973: snprintf(err, errlen, "%s is not a regular file", buf);
1974: return -1;
1975: }
1976: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
1977: (stp->st_mode & 022) != 0) {
1978: snprintf(err, errlen, "bad ownership or modes for file %s",
1979: buf);
1980: return -1;
1981: }
1982:
1983: /* for each component of the canonical path, walking upwards */
1984: for (;;) {
1985: if ((cp = dirname(buf)) == NULL) {
1986: snprintf(err, errlen, "dirname() failed");
1987: return -1;
1988: }
1989: strlcpy(buf, cp, sizeof(buf));
1990:
1.139 deraadt 1991: if (stat(buf, &st) == -1 ||
1.112 djm 1992: (st.st_uid != 0 && st.st_uid != uid) ||
1993: (st.st_mode & 022) != 0) {
1994: snprintf(err, errlen,
1995: "bad ownership or modes for directory %s", buf);
1996: return -1;
1997: }
1998:
1999: /* If are past the homedir then we can stop */
2000: if (comparehome && strcmp(homedir, buf) == 0)
2001: break;
2002:
2003: /*
2004: * dirname should always complete with a "/" path,
2005: * but we can be paranoid and check for "." too
2006: */
2007: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
2008: break;
2009: }
2010: return 0;
2011: }
2012:
2013: /*
2014: * Version of safe_path() that accepts an open file descriptor to
2015: * avoid races.
2016: *
2017: * Returns 0 on success and -1 on failure
2018: */
2019: int
2020: safe_path_fd(int fd, const char *file, struct passwd *pw,
2021: char *err, size_t errlen)
2022: {
2023: struct stat st;
2024:
2025: /* check the open file to avoid races */
1.139 deraadt 2026: if (fstat(fd, &st) == -1) {
1.112 djm 2027: snprintf(err, errlen, "cannot stat file %s: %s",
2028: file, strerror(errno));
2029: return -1;
2030: }
2031: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
2032: }
2033:
2034: /*
2035: * Sets the value of the given variable in the environment. If the variable
2036: * already exists, its value is overridden.
2037: */
2038: void
2039: child_set_env(char ***envp, u_int *envsizep, const char *name,
2040: const char *value)
2041: {
2042: char **env;
2043: u_int envsize;
2044: u_int i, namelen;
2045:
2046: if (strchr(name, '=') != NULL) {
2047: error("Invalid environment variable \"%.100s\"", name);
2048: return;
2049: }
2050:
2051: /*
2052: * Find the slot where the value should be stored. If the variable
2053: * already exists, we reuse the slot; otherwise we append a new slot
2054: * at the end of the array, expanding if necessary.
2055: */
2056: env = *envp;
2057: namelen = strlen(name);
2058: for (i = 0; env[i]; i++)
2059: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
2060: break;
2061: if (env[i]) {
2062: /* Reuse the slot. */
2063: free(env[i]);
2064: } else {
2065: /* New variable. Expand if necessary. */
2066: envsize = *envsizep;
2067: if (i >= envsize - 1) {
2068: if (envsize >= 1000)
2069: fatal("child_set_env: too many env vars");
2070: envsize += 50;
2071: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
2072: *envsizep = envsize;
2073: }
2074: /* Need to set the NULL pointer at end of array beyond the new slot. */
2075: env[i + 1] = NULL;
2076: }
2077:
2078: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 2079: /* XXX xasprintf */
1.112 djm 2080: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
2081: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
2082: }
2083:
1.114 millert 2084: /*
2085: * Check and optionally lowercase a domain name, also removes trailing '.'
2086: * Returns 1 on success and 0 on failure, storing an error message in errstr.
2087: */
2088: int
2089: valid_domain(char *name, int makelower, const char **errstr)
2090: {
2091: size_t i, l = strlen(name);
2092: u_char c, last = '\0';
2093: static char errbuf[256];
2094:
2095: if (l == 0) {
2096: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
2097: goto bad;
2098: }
2099: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
2100: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
2101: "starts with invalid character", name);
2102: goto bad;
2103: }
2104: for (i = 0; i < l; i++) {
2105: c = tolower((u_char)name[i]);
2106: if (makelower)
2107: name[i] = (char)c;
2108: if (last == '.' && c == '.') {
2109: snprintf(errbuf, sizeof(errbuf), "domain name "
2110: "\"%.100s\" contains consecutive separators", name);
2111: goto bad;
2112: }
2113: if (c != '.' && c != '-' && !isalnum(c) &&
2114: c != '_') /* technically invalid, but common */ {
2115: snprintf(errbuf, sizeof(errbuf), "domain name "
2116: "\"%.100s\" contains invalid characters", name);
2117: goto bad;
2118: }
2119: last = c;
2120: }
2121: if (name[l - 1] == '.')
2122: name[l - 1] = '\0';
2123: if (errstr != NULL)
2124: *errstr = NULL;
2125: return 1;
2126: bad:
2127: if (errstr != NULL)
2128: *errstr = errbuf;
2129: return 0;
1.132 djm 2130: }
2131:
2132: /*
2133: * Verify that a environment variable name (not including initial '$') is
2134: * valid; consisting of one or more alphanumeric or underscore characters only.
2135: * Returns 1 on valid, 0 otherwise.
2136: */
2137: int
2138: valid_env_name(const char *name)
2139: {
2140: const char *cp;
2141:
2142: if (name[0] == '\0')
2143: return 0;
2144: for (cp = name; *cp != '\0'; cp++) {
2145: if (!isalnum((u_char)*cp) && *cp != '_')
2146: return 0;
2147: }
2148: return 1;
1.120 dtucker 2149: }
2150:
2151: const char *
2152: atoi_err(const char *nptr, int *val)
2153: {
2154: const char *errstr = NULL;
2155: long long num;
2156:
2157: if (nptr == NULL || *nptr == '\0')
2158: return "missing";
2159: num = strtonum(nptr, 0, INT_MAX, &errstr);
2160: if (errstr == NULL)
2161: *val = (int)num;
2162: return errstr;
1.127 djm 2163: }
2164:
2165: int
2166: parse_absolute_time(const char *s, uint64_t *tp)
2167: {
2168: struct tm tm;
2169: time_t tt;
2170: char buf[32], *fmt;
2171:
2172: *tp = 0;
2173:
2174: /*
2175: * POSIX strptime says "The application shall ensure that there
2176: * is white-space or other non-alphanumeric characters between
2177: * any two conversion specifications" so arrange things this way.
2178: */
2179: switch (strlen(s)) {
2180: case 8: /* YYYYMMDD */
2181: fmt = "%Y-%m-%d";
2182: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
2183: break;
2184: case 12: /* YYYYMMDDHHMM */
2185: fmt = "%Y-%m-%dT%H:%M";
2186: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
2187: s, s + 4, s + 6, s + 8, s + 10);
2188: break;
2189: case 14: /* YYYYMMDDHHMMSS */
2190: fmt = "%Y-%m-%dT%H:%M:%S";
2191: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
2192: s, s + 4, s + 6, s + 8, s + 10, s + 12);
2193: break;
2194: default:
2195: return SSH_ERR_INVALID_FORMAT;
2196: }
2197:
2198: memset(&tm, 0, sizeof(tm));
2199: if (strptime(buf, fmt, &tm) == NULL)
2200: return SSH_ERR_INVALID_FORMAT;
2201: if ((tt = mktime(&tm)) < 0)
2202: return SSH_ERR_INVALID_FORMAT;
2203: /* success */
2204: *tp = (uint64_t)tt;
2205: return 0;
2206: }
2207:
2208: void
2209: format_absolute_time(uint64_t t, char *buf, size_t len)
2210: {
2211: time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */
2212: struct tm tm;
2213:
2214: localtime_r(&tt, &tm);
2215: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.134 djm 2216: }
2217:
2218: /* check if path is absolute */
2219: int
2220: path_absolute(const char *path)
2221: {
2222: return (*path == '/') ? 1 : 0;
1.141 djm 2223: }
2224:
2225: void
2226: skip_space(char **cpp)
2227: {
2228: char *cp;
2229:
2230: for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
2231: ;
2232: *cpp = cp;
1.114 millert 2233: }
1.142 djm 2234:
2235: /* authorized_key-style options parsing helpers */
2236:
2237: /*
2238: * Match flag 'opt' in *optsp, and if allow_negate is set then also match
2239: * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
2240: * if negated option matches.
2241: * If the option or negated option matches, then *optsp is updated to
2242: * point to the first character after the option.
2243: */
2244: int
2245: opt_flag(const char *opt, int allow_negate, const char **optsp)
2246: {
2247: size_t opt_len = strlen(opt);
2248: const char *opts = *optsp;
2249: int negate = 0;
2250:
2251: if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
2252: opts += 3;
2253: negate = 1;
2254: }
2255: if (strncasecmp(opts, opt, opt_len) == 0) {
2256: *optsp = opts + opt_len;
2257: return negate ? 0 : 1;
2258: }
2259: return -1;
2260: }
2261:
2262: char *
2263: opt_dequote(const char **sp, const char **errstrp)
2264: {
2265: const char *s = *sp;
2266: char *ret;
2267: size_t i;
2268:
2269: *errstrp = NULL;
2270: if (*s != '"') {
2271: *errstrp = "missing start quote";
2272: return NULL;
2273: }
2274: s++;
2275: if ((ret = malloc(strlen((s)) + 1)) == NULL) {
2276: *errstrp = "memory allocation failed";
2277: return NULL;
2278: }
2279: for (i = 0; *s != '\0' && *s != '"';) {
2280: if (s[0] == '\\' && s[1] == '"')
2281: s++;
2282: ret[i++] = *s++;
2283: }
2284: if (*s == '\0') {
2285: *errstrp = "missing end quote";
2286: free(ret);
2287: return NULL;
2288: }
2289: ret[i] = '\0';
2290: s++;
2291: *sp = s;
2292: return ret;
2293: }
2294:
2295: int
2296: opt_match(const char **opts, const char *term)
2297: {
2298: if (strncasecmp((*opts), term, strlen(term)) == 0 &&
2299: (*opts)[strlen(term)] == '=') {
2300: *opts += strlen(term) + 1;
2301: return 1;
2302: }
2303: return 0;
2304: }
2305:
1.144 dtucker 2306: sshsig_t
2307: ssh_signal(int signum, sshsig_t handler)
2308: {
2309: struct sigaction sa, osa;
2310:
2311: /* mask all other signals while in handler */
1.147 dtucker 2312: memset(&sa, 0, sizeof(sa));
1.144 dtucker 2313: sa.sa_handler = handler;
2314: sigfillset(&sa.sa_mask);
2315: if (signum != SIGALRM)
2316: sa.sa_flags = SA_RESTART;
2317: if (sigaction(signum, &sa, &osa) == -1) {
2318: debug3("sigaction(%s): %s", strsignal(signum), strerror(errno));
2319: return SIG_ERR;
2320: }
2321: return osa.sa_handler;
2322: }
![[BACK]](/icons/back.gif){kind=icon}
Return to misc.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh