Annotation of src/usr.bin/ssh/misc.c, Revision 1.153
1.153 ! djm 1: /* $OpenBSD: misc.c,v 1.152 2020/05/29 11:17:56 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;
1.153 ! djm 229: else if (r == -1 && errno != EAGAIN && errno != EINTR)
1.136 djm 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);
1.153 ! djm 268: for (;;) {
! 269: if (connect(sockfd, serv_addr, addrlen) == 0) {
! 270: /* Succeeded already? */
! 271: unset_nonblock(sockfd);
! 272: return 0;
! 273: } else if (errno == EINTR)
! 274: continue;
! 275: else if (errno != EINPROGRESS)
! 276: return -1;
! 277: break;
! 278: }
1.136 djm 279:
1.143 dtucker 280: if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
1.136 djm 281: return -1;
282:
283: /* Completed or failed */
284: if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
285: debug("getsockopt: %s", strerror(errno));
286: return -1;
287: }
288: if (optval != 0) {
289: errno = optval;
290: return -1;
291: }
292: unset_nonblock(sockfd);
1.117 djm 293: return 0;
1.72 reyk 294: }
295:
1.1 markus 296: /* Characters considered whitespace in strsep calls. */
297: #define WHITESPACE " \t\r\n"
1.46 dtucker 298: #define QUOTE "\""
1.1 markus 299:
1.12 markus 300: /* return next token in configuration line */
1.129 djm 301: static char *
302: strdelim_internal(char **s, int split_equals)
1.1 markus 303: {
1.126 djm 304: char *old;
1.1 markus 305: int wspace = 0;
306:
307: if (*s == NULL)
308: return NULL;
309:
310: old = *s;
311:
1.129 djm 312: *s = strpbrk(*s,
313: split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
1.1 markus 314: if (*s == NULL)
315: return (old);
316:
1.46 dtucker 317: if (*s[0] == '\"') {
318: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
319: /* Find matching quote */
1.126 djm 320: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
321: return (NULL); /* no matching quote */
322: } else {
323: *s[0] = '\0';
324: *s += strspn(*s + 1, WHITESPACE) + 1;
325: return (old);
1.46 dtucker 326: }
327: }
328:
1.1 markus 329: /* Allow only one '=' to be skipped */
1.129 djm 330: if (split_equals && *s[0] == '=')
1.1 markus 331: wspace = 1;
332: *s[0] = '\0';
333:
1.46 dtucker 334: /* Skip any extra whitespace after first token */
1.1 markus 335: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 336: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 337: *s += strspn(*s + 1, WHITESPACE) + 1;
338:
339: return (old);
1.129 djm 340: }
341:
342: /*
343: * Return next token in configuration line; splts on whitespace or a
344: * single '=' character.
345: */
346: char *
347: strdelim(char **s)
348: {
349: return strdelim_internal(s, 1);
350: }
351:
352: /*
353: * Return next token in configuration line; splts on whitespace only.
354: */
355: char *
356: strdelimw(char **s)
357: {
358: return strdelim_internal(s, 0);
1.2 markus 359: }
360:
361: struct passwd *
362: pwcopy(struct passwd *pw)
363: {
1.49 djm 364: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 365:
1.2 markus 366: copy->pw_name = xstrdup(pw->pw_name);
367: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 368: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 369: copy->pw_uid = pw->pw_uid;
370: copy->pw_gid = pw->pw_gid;
1.11 markus 371: copy->pw_expire = pw->pw_expire;
372: copy->pw_change = pw->pw_change;
1.2 markus 373: copy->pw_class = xstrdup(pw->pw_class);
374: copy->pw_dir = xstrdup(pw->pw_dir);
375: copy->pw_shell = xstrdup(pw->pw_shell);
376: return copy;
1.5 stevesk 377: }
378:
1.12 markus 379: /*
380: * Convert ASCII string to TCP/IP port number.
1.70 djm 381: * Port must be >=0 and <=65535.
382: * Return -1 if invalid.
1.12 markus 383: */
384: int
385: a2port(const char *s)
1.5 stevesk 386: {
1.133 naddy 387: struct servent *se;
1.70 djm 388: long long port;
389: const char *errstr;
1.5 stevesk 390:
1.70 djm 391: port = strtonum(s, 0, 65535, &errstr);
1.133 naddy 392: if (errstr == NULL)
393: return (int)port;
394: if ((se = getservbyname(s, "tcp")) != NULL)
395: return ntohs(se->s_port);
396: return -1;
1.9 stevesk 397: }
398:
1.36 reyk 399: int
400: a2tun(const char *s, int *remote)
401: {
402: const char *errstr = NULL;
403: char *sp, *ep;
404: int tun;
405:
406: if (remote != NULL) {
1.37 reyk 407: *remote = SSH_TUNID_ANY;
1.36 reyk 408: sp = xstrdup(s);
409: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 410: free(sp);
1.36 reyk 411: return (a2tun(s, NULL));
412: }
413: ep[0] = '\0'; ep++;
414: *remote = a2tun(ep, NULL);
415: tun = a2tun(sp, NULL);
1.89 djm 416: free(sp);
1.37 reyk 417: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 418: }
419:
420: if (strcasecmp(s, "any") == 0)
1.37 reyk 421: return (SSH_TUNID_ANY);
1.36 reyk 422:
1.37 reyk 423: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
424: if (errstr != NULL)
425: return (SSH_TUNID_ERR);
1.36 reyk 426:
427: return (tun);
428: }
429:
1.9 stevesk 430: #define SECONDS 1
431: #define MINUTES (SECONDS * 60)
432: #define HOURS (MINUTES * 60)
433: #define DAYS (HOURS * 24)
434: #define WEEKS (DAYS * 7)
435:
1.12 markus 436: /*
437: * Convert a time string into seconds; format is
438: * a sequence of:
439: * time[qualifier]
440: *
441: * Valid time qualifiers are:
442: * <none> seconds
443: * s|S seconds
444: * m|M minutes
445: * h|H hours
446: * d|D days
447: * w|W weeks
448: *
449: * Examples:
450: * 90m 90 minutes
451: * 1h30m 90 minutes
452: * 2d 2 days
453: * 1w 1 week
454: *
455: * Return -1 if time string is invalid.
456: */
457: long
458: convtime(const char *s)
1.9 stevesk 459: {
1.149 dtucker 460: long total, secs, multiplier;
1.9 stevesk 461: const char *p;
462: char *endp;
463:
464: errno = 0;
465: total = 0;
466: p = s;
467:
468: if (p == NULL || *p == '\0')
469: return -1;
470:
471: while (*p) {
472: secs = strtol(p, &endp, 10);
473: if (p == endp ||
474: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
475: secs < 0)
476: return -1;
477:
1.149 dtucker 478: multiplier = 1;
1.9 stevesk 479: switch (*endp++) {
480: case '\0':
481: endp--;
1.48 deraadt 482: break;
1.9 stevesk 483: case 's':
484: case 'S':
485: break;
486: case 'm':
487: case 'M':
1.108 dtucker 488: multiplier = MINUTES;
1.9 stevesk 489: break;
490: case 'h':
491: case 'H':
1.108 dtucker 492: multiplier = HOURS;
1.9 stevesk 493: break;
494: case 'd':
495: case 'D':
1.108 dtucker 496: multiplier = DAYS;
1.9 stevesk 497: break;
498: case 'w':
499: case 'W':
1.108 dtucker 500: multiplier = WEEKS;
1.9 stevesk 501: break;
502: default:
503: return -1;
504: }
1.109 dtucker 505: if (secs >= LONG_MAX / multiplier)
1.108 dtucker 506: return -1;
507: secs *= multiplier;
1.109 dtucker 508: if (total >= LONG_MAX - secs)
1.108 dtucker 509: return -1;
1.9 stevesk 510: total += secs;
511: if (total < 0)
512: return -1;
513: p = endp;
514: }
515:
516: return total;
1.148 djm 517: }
518:
519: #define TF_BUFS 8
520: #define TF_LEN 9
521:
522: const char *
523: fmt_timeframe(time_t t)
524: {
525: char *buf;
526: static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */
527: static int idx = 0;
528: unsigned int sec, min, hrs, day;
529: unsigned long long week;
530:
531: buf = tfbuf[idx++];
532: if (idx == TF_BUFS)
533: idx = 0;
534:
535: week = t;
536:
537: sec = week % 60;
538: week /= 60;
539: min = week % 60;
540: week /= 60;
541: hrs = week % 24;
542: week /= 24;
543: day = week % 7;
544: week /= 7;
545:
546: if (week > 0)
547: snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
548: else if (day > 0)
549: snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
550: else
551: snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);
552:
553: return (buf);
1.56 dtucker 554: }
555:
556: /*
557: * Returns a standardized host+port identifier string.
558: * Caller must free returned string.
559: */
560: char *
561: put_host_port(const char *host, u_short port)
562: {
563: char *hoststr;
564:
565: if (port == 0 || port == SSH_DEFAULT_PORT)
566: return(xstrdup(host));
1.138 deraadt 567: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
1.56 dtucker 568: fatal("put_host_port: asprintf: %s", strerror(errno));
569: debug3("put_host_port: %s", hoststr);
570: return hoststr;
1.28 djm 571: }
572:
573: /*
574: * Search for next delimiter between hostnames/addresses and ports.
575: * Argument may be modified (for termination).
576: * Returns *cp if parsing succeeds.
1.114 millert 577: * *cp is set to the start of the next field, if one was found.
578: * The delimiter char, if present, is stored in delim.
1.28 djm 579: * If this is the last field, *cp is set to NULL.
580: */
1.137 dtucker 581: char *
1.114 millert 582: hpdelim2(char **cp, char *delim)
1.28 djm 583: {
584: char *s, *old;
585:
586: if (cp == NULL || *cp == NULL)
587: return NULL;
588:
589: old = s = *cp;
590: if (*s == '[') {
591: if ((s = strchr(s, ']')) == NULL)
592: return NULL;
593: else
594: s++;
595: } else if ((s = strpbrk(s, ":/")) == NULL)
596: s = *cp + strlen(*cp); /* skip to end (see first case below) */
597:
598: switch (*s) {
599: case '\0':
600: *cp = NULL; /* no more fields*/
601: break;
1.29 deraadt 602:
1.28 djm 603: case ':':
604: case '/':
1.114 millert 605: if (delim != NULL)
606: *delim = *s;
1.28 djm 607: *s = '\0'; /* terminate */
608: *cp = s + 1;
609: break;
1.29 deraadt 610:
1.28 djm 611: default:
612: return NULL;
613: }
614:
615: return old;
1.6 mouring 616: }
617:
618: char *
1.114 millert 619: hpdelim(char **cp)
620: {
621: return hpdelim2(cp, NULL);
622: }
623:
624: char *
1.6 mouring 625: cleanhostname(char *host)
626: {
627: if (*host == '[' && host[strlen(host) - 1] == ']') {
628: host[strlen(host) - 1] = '\0';
629: return (host + 1);
630: } else
631: return host;
632: }
633:
634: char *
635: colon(char *cp)
636: {
637: int flag = 0;
638:
639: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 640: return NULL;
1.6 mouring 641: if (*cp == '[')
642: flag = 1;
643:
644: for (; *cp; ++cp) {
645: if (*cp == '@' && *(cp+1) == '[')
646: flag = 1;
647: if (*cp == ']' && *(cp+1) == ':' && flag)
648: return (cp+1);
649: if (*cp == ':' && !flag)
650: return (cp);
651: if (*cp == '/')
1.76 djm 652: return NULL;
1.6 mouring 653: }
1.76 djm 654: return NULL;
1.105 djm 655: }
656:
657: /*
1.114 millert 658: * Parse a [user@]host:[path] string.
659: * Caller must free returned user, host and path.
660: * Any of the pointer return arguments may be NULL (useful for syntax checking).
661: * If user was not specified then *userp will be set to NULL.
662: * If host was not specified then *hostp will be set to NULL.
663: * If path was not specified then *pathp will be set to ".".
664: * Returns 0 on success, -1 on failure.
665: */
666: int
667: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
668: {
669: char *user = NULL, *host = NULL, *path = NULL;
670: char *sdup, *tmp;
671: int ret = -1;
672:
673: if (userp != NULL)
674: *userp = NULL;
675: if (hostp != NULL)
676: *hostp = NULL;
677: if (pathp != NULL)
678: *pathp = NULL;
679:
1.116 millert 680: sdup = xstrdup(s);
1.114 millert 681:
682: /* Check for remote syntax: [user@]host:[path] */
683: if ((tmp = colon(sdup)) == NULL)
684: goto out;
685:
686: /* Extract optional path */
687: *tmp++ = '\0';
688: if (*tmp == '\0')
689: tmp = ".";
690: path = xstrdup(tmp);
691:
692: /* Extract optional user and mandatory host */
693: tmp = strrchr(sdup, '@');
694: if (tmp != NULL) {
695: *tmp++ = '\0';
696: host = xstrdup(cleanhostname(tmp));
697: if (*sdup != '\0')
698: user = xstrdup(sdup);
699: } else {
700: host = xstrdup(cleanhostname(sdup));
701: user = NULL;
702: }
703:
704: /* Success */
705: if (userp != NULL) {
706: *userp = user;
707: user = NULL;
708: }
709: if (hostp != NULL) {
710: *hostp = host;
711: host = NULL;
1.116 millert 712: }
1.114 millert 713: if (pathp != NULL) {
714: *pathp = path;
715: path = NULL;
1.116 millert 716: }
1.114 millert 717: ret = 0;
718: out:
719: free(sdup);
720: free(user);
721: free(host);
722: free(path);
723: return ret;
724: }
725:
726: /*
1.105 djm 727: * Parse a [user@]host[:port] string.
728: * Caller must free returned user and host.
729: * Any of the pointer return arguments may be NULL (useful for syntax checking).
730: * If user was not specified then *userp will be set to NULL.
731: * If port was not specified then *portp will be -1.
732: * Returns 0 on success, -1 on failure.
733: */
734: int
735: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
736: {
737: char *sdup, *cp, *tmp;
738: char *user = NULL, *host = NULL;
739: int port = -1, ret = -1;
740:
741: if (userp != NULL)
742: *userp = NULL;
743: if (hostp != NULL)
744: *hostp = NULL;
745: if (portp != NULL)
746: *portp = -1;
747:
748: if ((sdup = tmp = strdup(s)) == NULL)
749: return -1;
750: /* Extract optional username */
1.114 millert 751: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 752: *cp = '\0';
753: if (*tmp == '\0')
754: goto out;
755: if ((user = strdup(tmp)) == NULL)
756: goto out;
757: tmp = cp + 1;
758: }
759: /* Extract mandatory hostname */
760: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
761: goto out;
762: host = xstrdup(cleanhostname(cp));
763: /* Convert and verify optional port */
764: if (tmp != NULL && *tmp != '\0') {
765: if ((port = a2port(tmp)) <= 0)
766: goto out;
767: }
768: /* Success */
769: if (userp != NULL) {
770: *userp = user;
771: user = NULL;
772: }
773: if (hostp != NULL) {
774: *hostp = host;
775: host = NULL;
776: }
777: if (portp != NULL)
778: *portp = port;
779: ret = 0;
780: out:
781: free(sdup);
782: free(user);
783: free(host);
784: return ret;
1.7 mouring 785: }
786:
1.114 millert 787: /*
788: * Converts a two-byte hex string to decimal.
789: * Returns the decimal value or -1 for invalid input.
790: */
791: static int
792: hexchar(const char *s)
793: {
794: unsigned char result[2];
795: int i;
796:
797: for (i = 0; i < 2; i++) {
798: if (s[i] >= '0' && s[i] <= '9')
799: result[i] = (unsigned char)(s[i] - '0');
800: else if (s[i] >= 'a' && s[i] <= 'f')
801: result[i] = (unsigned char)(s[i] - 'a') + 10;
802: else if (s[i] >= 'A' && s[i] <= 'F')
803: result[i] = (unsigned char)(s[i] - 'A') + 10;
804: else
805: return -1;
806: }
807: return (result[0] << 4) | result[1];
808: }
809:
810: /*
811: * Decode an url-encoded string.
812: * Returns a newly allocated string on success or NULL on failure.
813: */
814: static char *
815: urldecode(const char *src)
816: {
817: char *ret, *dst;
818: int ch;
819:
820: ret = xmalloc(strlen(src) + 1);
821: for (dst = ret; *src != '\0'; src++) {
822: switch (*src) {
823: case '+':
824: *dst++ = ' ';
825: break;
826: case '%':
827: if (!isxdigit((unsigned char)src[1]) ||
828: !isxdigit((unsigned char)src[2]) ||
829: (ch = hexchar(src + 1)) == -1) {
830: free(ret);
831: return NULL;
832: }
833: *dst++ = ch;
834: src += 2;
835: break;
836: default:
837: *dst++ = *src;
838: break;
839: }
840: }
841: *dst = '\0';
842:
843: return ret;
844: }
845:
846: /*
847: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
848: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
849: * Either user or path may be url-encoded (but not host or port).
850: * Caller must free returned user, host and path.
851: * Any of the pointer return arguments may be NULL (useful for syntax checking)
852: * but the scheme must always be specified.
853: * If user was not specified then *userp will be set to NULL.
854: * If port was not specified then *portp will be -1.
855: * If path was not specified then *pathp will be set to NULL.
856: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
857: */
858: int
859: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
860: int *portp, char **pathp)
861: {
862: char *uridup, *cp, *tmp, ch;
863: char *user = NULL, *host = NULL, *path = NULL;
864: int port = -1, ret = -1;
865: size_t len;
866:
867: len = strlen(scheme);
868: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
869: return 1;
870: uri += len + 3;
871:
872: if (userp != NULL)
873: *userp = NULL;
874: if (hostp != NULL)
875: *hostp = NULL;
876: if (portp != NULL)
877: *portp = -1;
878: if (pathp != NULL)
879: *pathp = NULL;
880:
881: uridup = tmp = xstrdup(uri);
882:
883: /* Extract optional ssh-info (username + connection params) */
884: if ((cp = strchr(tmp, '@')) != NULL) {
885: char *delim;
886:
887: *cp = '\0';
888: /* Extract username and connection params */
889: if ((delim = strchr(tmp, ';')) != NULL) {
890: /* Just ignore connection params for now */
891: *delim = '\0';
892: }
893: if (*tmp == '\0') {
894: /* Empty username */
895: goto out;
896: }
897: if ((user = urldecode(tmp)) == NULL)
898: goto out;
899: tmp = cp + 1;
900: }
901:
902: /* Extract mandatory hostname */
903: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
904: goto out;
905: host = xstrdup(cleanhostname(cp));
906: if (!valid_domain(host, 0, NULL))
907: goto out;
908:
909: if (tmp != NULL && *tmp != '\0') {
910: if (ch == ':') {
911: /* Convert and verify port. */
912: if ((cp = strchr(tmp, '/')) != NULL)
913: *cp = '\0';
914: if ((port = a2port(tmp)) <= 0)
915: goto out;
916: tmp = cp ? cp + 1 : NULL;
917: }
918: if (tmp != NULL && *tmp != '\0') {
919: /* Extract optional path */
920: if ((path = urldecode(tmp)) == NULL)
921: goto out;
922: }
923: }
924:
925: /* Success */
926: if (userp != NULL) {
927: *userp = user;
928: user = NULL;
929: }
930: if (hostp != NULL) {
931: *hostp = host;
932: host = NULL;
933: }
934: if (portp != NULL)
935: *portp = port;
936: if (pathp != NULL) {
937: *pathp = path;
938: path = NULL;
939: }
940: ret = 0;
941: out:
942: free(uridup);
943: free(user);
944: free(host);
945: free(path);
946: return ret;
947: }
948:
1.12 markus 949: /* function to assist building execv() arguments */
1.7 mouring 950: void
951: addargs(arglist *args, char *fmt, ...)
952: {
953: va_list ap;
1.42 djm 954: char *cp;
1.25 avsm 955: u_int nalloc;
1.42 djm 956: int r;
1.7 mouring 957:
958: va_start(ap, fmt);
1.42 djm 959: r = vasprintf(&cp, fmt, ap);
1.7 mouring 960: va_end(ap);
1.42 djm 961: if (r == -1)
962: fatal("addargs: argument too long");
1.7 mouring 963:
1.22 markus 964: nalloc = args->nalloc;
1.7 mouring 965: if (args->list == NULL) {
1.22 markus 966: nalloc = 32;
1.7 mouring 967: args->num = 0;
1.22 markus 968: } else if (args->num+2 >= nalloc)
969: nalloc *= 2;
1.7 mouring 970:
1.110 deraadt 971: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 972: args->nalloc = nalloc;
1.42 djm 973: args->list[args->num++] = cp;
1.7 mouring 974: args->list[args->num] = NULL;
1.42 djm 975: }
976:
977: void
978: replacearg(arglist *args, u_int which, char *fmt, ...)
979: {
980: va_list ap;
981: char *cp;
982: int r;
983:
984: va_start(ap, fmt);
985: r = vasprintf(&cp, fmt, ap);
986: va_end(ap);
987: if (r == -1)
988: fatal("replacearg: argument too long");
989:
990: if (which >= args->num)
991: fatal("replacearg: tried to replace invalid arg %d >= %d",
992: which, args->num);
1.89 djm 993: free(args->list[which]);
1.42 djm 994: args->list[which] = cp;
995: }
996:
997: void
998: freeargs(arglist *args)
999: {
1000: u_int i;
1001:
1002: if (args->list != NULL) {
1003: for (i = 0; i < args->num; i++)
1.89 djm 1004: free(args->list[i]);
1005: free(args->list);
1.42 djm 1006: args->nalloc = args->num = 0;
1007: args->list = NULL;
1008: }
1.30 djm 1009: }
1010:
1011: /*
1012: * Expands tildes in the file name. Returns data allocated by xmalloc.
1013: * Warning: this calls getpw*.
1014: */
1015: char *
1016: tilde_expand_filename(const char *filename, uid_t uid)
1017: {
1.87 tedu 1018: const char *path, *sep;
1019: char user[128], *ret;
1.30 djm 1020: struct passwd *pw;
1.32 djm 1021: u_int len, slash;
1.30 djm 1022:
1023: if (*filename != '~')
1024: return (xstrdup(filename));
1025: filename++;
1026:
1027: path = strchr(filename, '/');
1028: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 1029: slash = path - filename;
1030: if (slash > sizeof(user) - 1)
1.30 djm 1031: fatal("tilde_expand_filename: ~username too long");
1.32 djm 1032: memcpy(user, filename, slash);
1033: user[slash] = '\0';
1.30 djm 1034: if ((pw = getpwnam(user)) == NULL)
1035: fatal("tilde_expand_filename: No such user %s", user);
1036: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 1037: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 1038:
1039: /* Make sure directory has a trailing '/' */
1040: len = strlen(pw->pw_dir);
1.88 tedu 1041: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 1042: sep = "/";
1043: else
1044: sep = "";
1.30 djm 1045:
1046: /* Skip leading '/' from specified path */
1047: if (path != NULL)
1048: filename = path + 1;
1.87 tedu 1049:
1.96 deraadt 1050: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 1051: fatal("tilde_expand_filename: Path too long");
1052:
1.87 tedu 1053: return (ret);
1.31 djm 1054: }
1055:
1056: /*
1.150 dtucker 1057: * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT}
1058: * substitutions. A number of escapes may be specified as
1059: * (char *escape_chars, char *replacement) pairs. The list must be terminated
1060: * by a NULL escape_char. Returns replaced string in memory allocated by
1061: * xmalloc which the caller must free.
1.31 djm 1062: */
1.150 dtucker 1063: static char *
1064: vdollar_percent_expand(int *parseerror, int dollar, int percent,
1065: const char *string, va_list ap)
1.31 djm 1066: {
1067: #define EXPAND_MAX_KEYS 16
1.150 dtucker 1068: u_int num_keys = 0, i;
1.31 djm 1069: struct {
1070: const char *key;
1071: const char *repl;
1072: } keys[EXPAND_MAX_KEYS];
1.140 djm 1073: struct sshbuf *buf;
1.150 dtucker 1074: int r, missingvar = 0;
1075: char *ret = NULL, *var, *varend, *val;
1076: size_t len;
1.140 djm 1077:
1078: if ((buf = sshbuf_new()) == NULL)
1079: fatal("%s: sshbuf_new failed", __func__);
1.150 dtucker 1080: if (parseerror == NULL)
1081: fatal("%s: null parseerror arg", __func__);
1082: *parseerror = 1;
1083:
1084: /* Gather keys if we're doing percent expansion. */
1085: if (percent) {
1086: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
1087: keys[num_keys].key = va_arg(ap, char *);
1088: if (keys[num_keys].key == NULL)
1089: break;
1090: keys[num_keys].repl = va_arg(ap, char *);
1091: if (keys[num_keys].repl == NULL)
1092: fatal("%s: NULL replacement for token %s", __func__, keys[num_keys].key);
1093: }
1094: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
1095: fatal("%s: too many keys", __func__);
1096: if (num_keys == 0)
1097: fatal("%s: percent expansion without token list",
1098: __func__);
1.31 djm 1099: }
1100:
1101: /* Expand string */
1102: for (i = 0; *string != '\0'; string++) {
1.150 dtucker 1103: /* Optionally process ${ENVIRONMENT} expansions. */
1104: if (dollar && string[0] == '$' && string[1] == '{') {
1105: string += 2; /* skip over '${' */
1106: if ((varend = strchr(string, '}')) == NULL) {
1107: error("%s: environment variable '%s' missing "
1108: "closing '}'", __func__, string);
1109: goto out;
1110: }
1111: len = varend - string;
1112: if (len == 0) {
1113: error("%s: zero-length environment variable",
1114: __func__);
1115: goto out;
1116: }
1117: var = xmalloc(len + 1);
1118: (void)strlcpy(var, string, len + 1);
1119: if ((val = getenv(var)) == NULL) {
1120: error("%s: env var ${%s} has no value",
1121: __func__, var);
1122: missingvar = 1;
1123: } else {
1124: debug3("%s: expand ${%s} -> '%s'", __func__,
1125: var, val);
1126: if ((r = sshbuf_put(buf, val, strlen(val))) !=0)
1127: fatal("%s: sshbuf_put: %s", __func__,
1128: ssh_err(r));
1129: }
1130: free(var);
1131: string += len;
1132: continue;
1133: }
1134:
1135: /*
1136: * Process percent expansions if we have a list of TOKENs.
1137: * If we're not doing percent expansion everything just gets
1138: * appended here.
1139: */
1140: if (*string != '%' || !percent) {
1.31 djm 1141: append:
1.140 djm 1142: if ((r = sshbuf_put_u8(buf, *string)) != 0) {
1143: fatal("%s: sshbuf_put_u8: %s",
1144: __func__, ssh_err(r));
1145: }
1.31 djm 1146: continue;
1147: }
1148: string++;
1.73 djm 1149: /* %% case */
1.31 djm 1150: if (*string == '%')
1151: goto append;
1.150 dtucker 1152: if (*string == '\0') {
1153: error("%s: invalid format", __func__);
1154: goto out;
1155: }
1.140 djm 1156: for (i = 0; i < num_keys; i++) {
1157: if (strchr(keys[i].key, *string) != NULL) {
1158: if ((r = sshbuf_put(buf, keys[i].repl,
1159: strlen(keys[i].repl))) != 0) {
1160: fatal("%s: sshbuf_put: %s",
1161: __func__, ssh_err(r));
1162: }
1.31 djm 1163: break;
1164: }
1165: }
1.150 dtucker 1166: if (i >= num_keys) {
1167: error("%s: unknown key %%%c", __func__, *string);
1168: goto out;
1169: }
1.31 djm 1170: }
1.150 dtucker 1171: if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL)
1.140 djm 1172: fatal("%s: sshbuf_dup_string failed", __func__);
1.150 dtucker 1173: *parseerror = 0;
1174: out:
1.140 djm 1175: sshbuf_free(buf);
1.150 dtucker 1176: return *parseerror ? NULL : ret;
1177: #undef EXPAND_MAX_KEYS
1178: }
1179:
1.152 dtucker 1180: /*
1181: * Expand only environment variables.
1182: * Note that although this function is variadic like the other similar
1183: * functions, any such arguments will be unused.
1184: */
1185:
1.150 dtucker 1186: char *
1.152 dtucker 1187: dollar_expand(int *parseerr, const char *string, ...)
1.150 dtucker 1188: {
1189: char *ret;
1190: int err;
1.152 dtucker 1191: va_list ap;
1.150 dtucker 1192:
1.152 dtucker 1193: va_start(ap, string);
1194: ret = vdollar_percent_expand(&err, 1, 0, string, ap);
1195: va_end(ap);
1.150 dtucker 1196: if (parseerr != NULL)
1197: *parseerr = err;
1198: return ret;
1199: }
1200:
1201: /*
1202: * Returns expanded string or NULL if a specified environment variable is
1203: * not defined, or calls fatal if the string is invalid.
1204: */
1205: char *
1206: percent_expand(const char *string, ...)
1207: {
1208: char *ret;
1209: int err;
1210: va_list ap;
1211:
1212: va_start(ap, string);
1213: ret = vdollar_percent_expand(&err, 0, 1, string, ap);
1214: va_end(ap);
1215: if (err)
1216: fatal("%s failed", __func__);
1217: return ret;
1218: }
1219:
1220: /*
1221: * Returns expanded string or NULL if a specified environment variable is
1222: * not defined, or calls fatal if the string is invalid.
1223: */
1224: char *
1225: percent_dollar_expand(const char *string, ...)
1226: {
1227: char *ret;
1228: int err;
1229: va_list ap;
1230:
1231: va_start(ap, string);
1232: ret = vdollar_percent_expand(&err, 1, 1, string, ap);
1233: va_end(ap);
1234: if (err)
1235: fatal("%s failed", __func__);
1.140 djm 1236: return ret;
1.36 reyk 1237: }
1238:
1239: int
1.115 djm 1240: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1241: {
1.37 reyk 1242: struct ifreq ifr;
1.36 reyk 1243: char name[100];
1.37 reyk 1244: int fd = -1, sock;
1.99 sthen 1245: const char *tunbase = "tun";
1246:
1.115 djm 1247: if (ifname != NULL)
1248: *ifname = NULL;
1249:
1.99 sthen 1250: if (mode == SSH_TUNMODE_ETHERNET)
1251: tunbase = "tap";
1.36 reyk 1252:
1.37 reyk 1253: /* Open the tunnel device */
1254: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1255: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1256: fd = open(name, O_RDWR);
1257: } else if (tun == SSH_TUNID_ANY) {
1258: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1259: snprintf(name, sizeof(name), "/dev/%s%d",
1260: tunbase, tun);
1.37 reyk 1261: if ((fd = open(name, O_RDWR)) >= 0)
1262: break;
1.36 reyk 1263: }
1264: } else {
1.39 stevesk 1265: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 1266: return -1;
1.37 reyk 1267: }
1268:
1.139 deraadt 1269: if (fd == -1) {
1.98 djm 1270: debug("%s: %s open: %s", __func__, name, strerror(errno));
1271: return -1;
1.36 reyk 1272: }
1.37 reyk 1273:
1274: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1275:
1.99 sthen 1276: /* Bring interface up if it is not already */
1277: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1278: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1279: goto failed;
1280:
1.98 djm 1281: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1282: debug("%s: get interface %s flags: %s", __func__,
1283: ifr.ifr_name, strerror(errno));
1.37 reyk 1284: goto failed;
1.98 djm 1285: }
1.40 reyk 1286:
1.98 djm 1287: if (!(ifr.ifr_flags & IFF_UP)) {
1288: ifr.ifr_flags |= IFF_UP;
1289: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1290: debug("%s: activate interface %s: %s", __func__,
1291: ifr.ifr_name, strerror(errno));
1292: goto failed;
1293: }
1294: }
1.115 djm 1295:
1296: if (ifname != NULL)
1297: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1298:
1299: close(sock);
1.98 djm 1300: return fd;
1.37 reyk 1301:
1302: failed:
1303: if (fd >= 0)
1304: close(fd);
1305: if (sock >= 0)
1306: close(sock);
1.98 djm 1307: return -1;
1.35 djm 1308: }
1309:
1310: void
1311: sanitise_stdfd(void)
1312: {
1.41 djm 1313: int nullfd, dupfd;
1.35 djm 1314:
1.41 djm 1315: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1316: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1317: strerror(errno));
1.35 djm 1318: exit(1);
1319: }
1.103 krw 1320: while (++dupfd <= STDERR_FILENO) {
1321: /* Only populate closed fds. */
1322: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1323: if (dup2(nullfd, dupfd) == -1) {
1324: fprintf(stderr, "dup2: %s\n", strerror(errno));
1325: exit(1);
1326: }
1.35 djm 1327: }
1328: }
1.103 krw 1329: if (nullfd > STDERR_FILENO)
1.35 djm 1330: close(nullfd);
1.1 markus 1331: }
1.33 djm 1332:
1333: char *
1.52 djm 1334: tohex(const void *vp, size_t l)
1.33 djm 1335: {
1.52 djm 1336: const u_char *p = (const u_char *)vp;
1.33 djm 1337: char b[3], *r;
1.52 djm 1338: size_t i, hl;
1339:
1340: if (l > 65536)
1341: return xstrdup("tohex: length > 65536");
1.33 djm 1342:
1343: hl = l * 2 + 1;
1.49 djm 1344: r = xcalloc(1, hl);
1.33 djm 1345: for (i = 0; i < l; i++) {
1.52 djm 1346: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1347: strlcat(r, b, hl);
1348: }
1349: return (r);
1350: }
1.145 djm 1351:
1352: /*
1353: * Extend string *sp by the specified format. If *sp is not NULL (or empty),
1354: * then the separator 'sep' will be prepended before the formatted arguments.
1355: * Extended strings are heap allocated.
1356: */
1357: void
1358: xextendf(char **sp, const char *sep, const char *fmt, ...)
1359: {
1360: va_list ap;
1361: char *tmp1, *tmp2;
1362:
1363: va_start(ap, fmt);
1364: xvasprintf(&tmp1, fmt, ap);
1365: va_end(ap);
1366:
1367: if (*sp == NULL || **sp == '\0') {
1368: free(*sp);
1369: *sp = tmp1;
1370: return;
1371: }
1372: xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1);
1373: free(tmp1);
1374: free(*sp);
1375: *sp = tmp2;
1376: }
1377:
1.33 djm 1378:
1.52 djm 1379: u_int64_t
1380: get_u64(const void *vp)
1381: {
1382: const u_char *p = (const u_char *)vp;
1383: u_int64_t v;
1384:
1385: v = (u_int64_t)p[0] << 56;
1386: v |= (u_int64_t)p[1] << 48;
1387: v |= (u_int64_t)p[2] << 40;
1388: v |= (u_int64_t)p[3] << 32;
1389: v |= (u_int64_t)p[4] << 24;
1390: v |= (u_int64_t)p[5] << 16;
1391: v |= (u_int64_t)p[6] << 8;
1392: v |= (u_int64_t)p[7];
1393:
1394: return (v);
1395: }
1396:
1397: u_int32_t
1398: get_u32(const void *vp)
1399: {
1400: const u_char *p = (const u_char *)vp;
1401: u_int32_t v;
1402:
1403: v = (u_int32_t)p[0] << 24;
1404: v |= (u_int32_t)p[1] << 16;
1405: v |= (u_int32_t)p[2] << 8;
1406: v |= (u_int32_t)p[3];
1407:
1408: return (v);
1409: }
1410:
1.93 djm 1411: u_int32_t
1412: get_u32_le(const void *vp)
1413: {
1414: const u_char *p = (const u_char *)vp;
1415: u_int32_t v;
1416:
1417: v = (u_int32_t)p[0];
1418: v |= (u_int32_t)p[1] << 8;
1419: v |= (u_int32_t)p[2] << 16;
1420: v |= (u_int32_t)p[3] << 24;
1421:
1422: return (v);
1423: }
1424:
1.52 djm 1425: u_int16_t
1426: get_u16(const void *vp)
1427: {
1428: const u_char *p = (const u_char *)vp;
1429: u_int16_t v;
1430:
1431: v = (u_int16_t)p[0] << 8;
1432: v |= (u_int16_t)p[1];
1433:
1434: return (v);
1435: }
1436:
1437: void
1438: put_u64(void *vp, u_int64_t v)
1439: {
1440: u_char *p = (u_char *)vp;
1441:
1442: p[0] = (u_char)(v >> 56) & 0xff;
1443: p[1] = (u_char)(v >> 48) & 0xff;
1444: p[2] = (u_char)(v >> 40) & 0xff;
1445: p[3] = (u_char)(v >> 32) & 0xff;
1446: p[4] = (u_char)(v >> 24) & 0xff;
1447: p[5] = (u_char)(v >> 16) & 0xff;
1448: p[6] = (u_char)(v >> 8) & 0xff;
1449: p[7] = (u_char)v & 0xff;
1450: }
1451:
1452: void
1453: put_u32(void *vp, u_int32_t v)
1454: {
1455: u_char *p = (u_char *)vp;
1456:
1457: p[0] = (u_char)(v >> 24) & 0xff;
1458: p[1] = (u_char)(v >> 16) & 0xff;
1459: p[2] = (u_char)(v >> 8) & 0xff;
1460: p[3] = (u_char)v & 0xff;
1461: }
1462:
1.93 djm 1463: void
1464: put_u32_le(void *vp, u_int32_t v)
1465: {
1466: u_char *p = (u_char *)vp;
1467:
1468: p[0] = (u_char)v & 0xff;
1469: p[1] = (u_char)(v >> 8) & 0xff;
1470: p[2] = (u_char)(v >> 16) & 0xff;
1471: p[3] = (u_char)(v >> 24) & 0xff;
1472: }
1.52 djm 1473:
1474: void
1475: put_u16(void *vp, u_int16_t v)
1476: {
1477: u_char *p = (u_char *)vp;
1478:
1479: p[0] = (u_char)(v >> 8) & 0xff;
1480: p[1] = (u_char)v & 0xff;
1481: }
1.68 dtucker 1482:
1483: void
1484: ms_subtract_diff(struct timeval *start, int *ms)
1485: {
1486: struct timeval diff, finish;
1487:
1.119 dtucker 1488: monotime_tv(&finish);
1489: timersub(&finish, start, &diff);
1.68 dtucker 1490: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1491: }
1492:
1493: void
1494: ms_to_timeval(struct timeval *tv, int ms)
1495: {
1496: if (ms < 0)
1497: ms = 0;
1498: tv->tv_sec = ms / 1000;
1499: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 1500: }
1501:
1.119 dtucker 1502: void
1503: monotime_ts(struct timespec *ts)
1504: {
1505: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1506: fatal("clock_gettime: %s", strerror(errno));
1507: }
1508:
1509: void
1510: monotime_tv(struct timeval *tv)
1511: {
1512: struct timespec ts;
1513:
1514: monotime_ts(&ts);
1515: tv->tv_sec = ts.tv_sec;
1516: tv->tv_usec = ts.tv_nsec / 1000;
1517: }
1518:
1.90 dtucker 1519: time_t
1520: monotime(void)
1521: {
1522: struct timespec ts;
1523:
1.119 dtucker 1524: monotime_ts(&ts);
1.90 dtucker 1525: return (ts.tv_sec);
1.102 dtucker 1526: }
1527:
1528: double
1529: monotime_double(void)
1530: {
1531: struct timespec ts;
1532:
1.119 dtucker 1533: monotime_ts(&ts);
1534: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1535: }
1536:
1537: void
1538: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1539: {
1540: bw->buflen = buflen;
1541: bw->rate = kbps;
1.135 dtucker 1542: bw->thresh = buflen;
1.81 djm 1543: bw->lamt = 0;
1544: timerclear(&bw->bwstart);
1545: timerclear(&bw->bwend);
1.135 dtucker 1546: }
1.81 djm 1547:
1548: /* Callback from read/write loop to insert bandwidth-limiting delays */
1549: void
1550: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1551: {
1552: u_int64_t waitlen;
1553: struct timespec ts, rm;
1554:
1.135 dtucker 1555: bw->lamt += read_len;
1.81 djm 1556: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1557: monotime_tv(&bw->bwstart);
1.81 djm 1558: return;
1559: }
1560: if (bw->lamt < bw->thresh)
1561: return;
1562:
1.119 dtucker 1563: monotime_tv(&bw->bwend);
1.81 djm 1564: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1565: if (!timerisset(&bw->bwend))
1566: return;
1567:
1568: bw->lamt *= 8;
1569: waitlen = (double)1000000L * bw->lamt / bw->rate;
1570:
1571: bw->bwstart.tv_sec = waitlen / 1000000L;
1572: bw->bwstart.tv_usec = waitlen % 1000000L;
1573:
1574: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1575: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1576:
1577: /* Adjust the wait time */
1578: if (bw->bwend.tv_sec) {
1579: bw->thresh /= 2;
1580: if (bw->thresh < bw->buflen / 4)
1581: bw->thresh = bw->buflen / 4;
1582: } else if (bw->bwend.tv_usec < 10000) {
1583: bw->thresh *= 2;
1584: if (bw->thresh > bw->buflen * 8)
1585: bw->thresh = bw->buflen * 8;
1586: }
1587:
1588: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1589: while (nanosleep(&ts, &rm) == -1) {
1590: if (errno != EINTR)
1591: break;
1592: ts = rm;
1593: }
1594: }
1595:
1596: bw->lamt = 0;
1.119 dtucker 1597: monotime_tv(&bw->bwstart);
1.84 djm 1598: }
1599:
1600: /* Make a template filename for mk[sd]temp() */
1601: void
1602: mktemp_proto(char *s, size_t len)
1603: {
1604: const char *tmpdir;
1605: int r;
1606:
1607: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1608: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1609: if (r > 0 && (size_t)r < len)
1610: return;
1611: }
1612: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1613: if (r < 0 || (size_t)r >= len)
1614: fatal("%s: template string too short", __func__);
1.68 dtucker 1615: }
1.83 djm 1616:
1617: static const struct {
1618: const char *name;
1619: int value;
1620: } ipqos[] = {
1.111 djm 1621: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1622: { "af11", IPTOS_DSCP_AF11 },
1623: { "af12", IPTOS_DSCP_AF12 },
1624: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1625: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1626: { "af22", IPTOS_DSCP_AF22 },
1627: { "af23", IPTOS_DSCP_AF23 },
1628: { "af31", IPTOS_DSCP_AF31 },
1629: { "af32", IPTOS_DSCP_AF32 },
1630: { "af33", IPTOS_DSCP_AF33 },
1631: { "af41", IPTOS_DSCP_AF41 },
1632: { "af42", IPTOS_DSCP_AF42 },
1633: { "af43", IPTOS_DSCP_AF43 },
1634: { "cs0", IPTOS_DSCP_CS0 },
1635: { "cs1", IPTOS_DSCP_CS1 },
1636: { "cs2", IPTOS_DSCP_CS2 },
1637: { "cs3", IPTOS_DSCP_CS3 },
1638: { "cs4", IPTOS_DSCP_CS4 },
1639: { "cs5", IPTOS_DSCP_CS5 },
1640: { "cs6", IPTOS_DSCP_CS6 },
1641: { "cs7", IPTOS_DSCP_CS7 },
1642: { "ef", IPTOS_DSCP_EF },
1.146 djm 1643: { "le", IPTOS_DSCP_LE },
1.83 djm 1644: { "lowdelay", IPTOS_LOWDELAY },
1645: { "throughput", IPTOS_THROUGHPUT },
1646: { "reliability", IPTOS_RELIABILITY },
1647: { NULL, -1 }
1648: };
1649:
1650: int
1651: parse_ipqos(const char *cp)
1652: {
1653: u_int i;
1654: char *ep;
1655: long val;
1656:
1657: if (cp == NULL)
1658: return -1;
1659: for (i = 0; ipqos[i].name != NULL; i++) {
1660: if (strcasecmp(cp, ipqos[i].name) == 0)
1661: return ipqos[i].value;
1662: }
1663: /* Try parsing as an integer */
1664: val = strtol(cp, &ep, 0);
1665: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1666: return -1;
1667: return val;
1668: }
1669:
1.85 stevesk 1670: const char *
1671: iptos2str(int iptos)
1672: {
1673: int i;
1674: static char iptos_str[sizeof "0xff"];
1675:
1676: for (i = 0; ipqos[i].name != NULL; i++) {
1677: if (ipqos[i].value == iptos)
1678: return ipqos[i].name;
1679: }
1680: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1681: return iptos_str;
1.92 djm 1682: }
1683:
1684: void
1685: lowercase(char *s)
1686: {
1687: for (; *s; s++)
1688: *s = tolower((u_char)*s);
1.94 millert 1689: }
1690:
1691: int
1692: unix_listener(const char *path, int backlog, int unlink_first)
1693: {
1694: struct sockaddr_un sunaddr;
1695: int saved_errno, sock;
1696:
1697: memset(&sunaddr, 0, sizeof(sunaddr));
1698: sunaddr.sun_family = AF_UNIX;
1.121 djm 1699: if (strlcpy(sunaddr.sun_path, path,
1700: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1701: error("%s: path \"%s\" too long for Unix domain socket",
1702: __func__, path);
1.94 millert 1703: errno = ENAMETOOLONG;
1704: return -1;
1705: }
1706:
1707: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1.139 deraadt 1708: if (sock == -1) {
1.94 millert 1709: saved_errno = errno;
1.121 djm 1710: error("%s: socket: %.100s", __func__, strerror(errno));
1.94 millert 1711: errno = saved_errno;
1712: return -1;
1713: }
1714: if (unlink_first == 1) {
1715: if (unlink(path) != 0 && errno != ENOENT)
1716: error("unlink(%s): %.100s", path, strerror(errno));
1717: }
1.139 deraadt 1718: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 millert 1719: saved_errno = errno;
1.121 djm 1720: error("%s: cannot bind to path %s: %s",
1721: __func__, path, strerror(errno));
1.122 djm 1722: close(sock);
1.94 millert 1723: errno = saved_errno;
1724: return -1;
1725: }
1.139 deraadt 1726: if (listen(sock, backlog) == -1) {
1.94 millert 1727: saved_errno = errno;
1.122 djm 1728: error("%s: cannot listen on path %s: %s",
1729: __func__, path, strerror(errno));
1.94 millert 1730: close(sock);
1731: unlink(path);
1732: errno = saved_errno;
1733: return -1;
1734: }
1735: return sock;
1.85 stevesk 1736: }
1.104 djm 1737:
1738: /*
1739: * Compares two strings that maybe be NULL. Returns non-zero if strings
1740: * are both NULL or are identical, returns zero otherwise.
1741: */
1742: static int
1743: strcmp_maybe_null(const char *a, const char *b)
1744: {
1745: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1746: return 0;
1747: if (a != NULL && strcmp(a, b) != 0)
1748: return 0;
1749: return 1;
1750: }
1751:
1752: /*
1753: * Compare two forwards, returning non-zero if they are identical or
1754: * zero otherwise.
1755: */
1756: int
1757: forward_equals(const struct Forward *a, const struct Forward *b)
1758: {
1759: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1760: return 0;
1761: if (a->listen_port != b->listen_port)
1762: return 0;
1763: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1764: return 0;
1765: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1766: return 0;
1767: if (a->connect_port != b->connect_port)
1768: return 0;
1769: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1770: return 0;
1771: /* allocated_port and handle are not checked */
1.107 dtucker 1772: return 1;
1773: }
1774:
1775: /* returns 1 if process is already daemonized, 0 otherwise */
1776: int
1777: daemonized(void)
1778: {
1779: int fd;
1780:
1781: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1782: close(fd);
1783: return 0; /* have controlling terminal */
1784: }
1785: if (getppid() != 1)
1786: return 0; /* parent is not init */
1787: if (getsid(0) != getpid())
1788: return 0; /* not session leader */
1789: debug3("already daemonized");
1.106 dtucker 1790: return 1;
1791: }
1.112 djm 1792:
1793:
1794: /*
1795: * Splits 's' into an argument vector. Handles quoted string and basic
1796: * escape characters (\\, \", \'). Caller must free the argument vector
1797: * and its members.
1798: */
1799: int
1800: argv_split(const char *s, int *argcp, char ***argvp)
1801: {
1802: int r = SSH_ERR_INTERNAL_ERROR;
1803: int argc = 0, quote, i, j;
1804: char *arg, **argv = xcalloc(1, sizeof(*argv));
1805:
1806: *argvp = NULL;
1807: *argcp = 0;
1808:
1809: for (i = 0; s[i] != '\0'; i++) {
1810: /* Skip leading whitespace */
1811: if (s[i] == ' ' || s[i] == '\t')
1812: continue;
1813:
1814: /* Start of a token */
1815: quote = 0;
1816: if (s[i] == '\\' &&
1817: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1818: i++;
1819: else if (s[i] == '\'' || s[i] == '"')
1820: quote = s[i++];
1821:
1822: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1823: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1824: argv[argc] = NULL;
1825:
1826: /* Copy the token in, removing escapes */
1827: for (j = 0; s[i] != '\0'; i++) {
1828: if (s[i] == '\\') {
1829: if (s[i + 1] == '\'' ||
1830: s[i + 1] == '\"' ||
1831: s[i + 1] == '\\') {
1832: i++; /* Skip '\' */
1833: arg[j++] = s[i];
1834: } else {
1835: /* Unrecognised escape */
1836: arg[j++] = s[i];
1837: }
1838: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1839: break; /* done */
1840: else if (quote != 0 && s[i] == quote)
1841: break; /* done */
1842: else
1843: arg[j++] = s[i];
1844: }
1845: if (s[i] == '\0') {
1846: if (quote != 0) {
1847: /* Ran out of string looking for close quote */
1848: r = SSH_ERR_INVALID_FORMAT;
1849: goto out;
1850: }
1851: break;
1852: }
1853: }
1854: /* Success */
1855: *argcp = argc;
1856: *argvp = argv;
1857: argc = 0;
1858: argv = NULL;
1859: r = 0;
1860: out:
1861: if (argc != 0 && argv != NULL) {
1862: for (i = 0; i < argc; i++)
1863: free(argv[i]);
1864: free(argv);
1865: }
1866: return r;
1867: }
1868:
1869: /*
1870: * Reassemble an argument vector into a string, quoting and escaping as
1871: * necessary. Caller must free returned string.
1872: */
1873: char *
1874: argv_assemble(int argc, char **argv)
1875: {
1876: int i, j, ws, r;
1877: char c, *ret;
1878: struct sshbuf *buf, *arg;
1879:
1880: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1881: fatal("%s: sshbuf_new failed", __func__);
1882:
1883: for (i = 0; i < argc; i++) {
1884: ws = 0;
1885: sshbuf_reset(arg);
1886: for (j = 0; argv[i][j] != '\0'; j++) {
1887: r = 0;
1888: c = argv[i][j];
1889: switch (c) {
1890: case ' ':
1891: case '\t':
1892: ws = 1;
1893: r = sshbuf_put_u8(arg, c);
1894: break;
1895: case '\\':
1896: case '\'':
1897: case '"':
1898: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1899: break;
1900: /* FALLTHROUGH */
1901: default:
1902: r = sshbuf_put_u8(arg, c);
1903: break;
1904: }
1905: if (r != 0)
1906: fatal("%s: sshbuf_put_u8: %s",
1907: __func__, ssh_err(r));
1908: }
1909: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1910: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1911: (r = sshbuf_putb(buf, arg)) != 0 ||
1912: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1913: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1914: }
1915: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1916: fatal("%s: malloc failed", __func__);
1917: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1918: ret[sshbuf_len(buf)] = '\0';
1919: sshbuf_free(buf);
1920: sshbuf_free(arg);
1921: return ret;
1922: }
1923:
1924: /* Returns 0 if pid exited cleanly, non-zero otherwise */
1925: int
1.113 djm 1926: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 1927: {
1928: int status;
1929:
1930: while (waitpid(pid, &status, 0) == -1) {
1931: if (errno != EINTR) {
1932: error("%s: waitpid: %s", tag, strerror(errno));
1933: return -1;
1934: }
1935: }
1936: if (WIFSIGNALED(status)) {
1937: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1938: return -1;
1939: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 1940: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1941: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 1942: return -1;
1943: }
1944: return 0;
1945: }
1946:
1947: /*
1948: * Check a given path for security. This is defined as all components
1949: * of the path to the file must be owned by either the owner of
1950: * of the file or root and no directories must be group or world writable.
1951: *
1952: * XXX Should any specific check be done for sym links ?
1953: *
1954: * Takes a file name, its stat information (preferably from fstat() to
1955: * avoid races), the uid of the expected owner, their home directory and an
1956: * error buffer plus max size as arguments.
1957: *
1958: * Returns 0 on success and -1 on failure
1959: */
1960: int
1961: safe_path(const char *name, struct stat *stp, const char *pw_dir,
1962: uid_t uid, char *err, size_t errlen)
1963: {
1964: char buf[PATH_MAX], homedir[PATH_MAX];
1965: char *cp;
1966: int comparehome = 0;
1967: struct stat st;
1968:
1969: if (realpath(name, buf) == NULL) {
1970: snprintf(err, errlen, "realpath %s failed: %s", name,
1971: strerror(errno));
1972: return -1;
1973: }
1974: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1975: comparehome = 1;
1976:
1977: if (!S_ISREG(stp->st_mode)) {
1978: snprintf(err, errlen, "%s is not a regular file", buf);
1979: return -1;
1980: }
1981: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
1982: (stp->st_mode & 022) != 0) {
1983: snprintf(err, errlen, "bad ownership or modes for file %s",
1984: buf);
1985: return -1;
1986: }
1987:
1988: /* for each component of the canonical path, walking upwards */
1989: for (;;) {
1990: if ((cp = dirname(buf)) == NULL) {
1991: snprintf(err, errlen, "dirname() failed");
1992: return -1;
1993: }
1994: strlcpy(buf, cp, sizeof(buf));
1995:
1.139 deraadt 1996: if (stat(buf, &st) == -1 ||
1.112 djm 1997: (st.st_uid != 0 && st.st_uid != uid) ||
1998: (st.st_mode & 022) != 0) {
1999: snprintf(err, errlen,
2000: "bad ownership or modes for directory %s", buf);
2001: return -1;
2002: }
2003:
2004: /* If are past the homedir then we can stop */
2005: if (comparehome && strcmp(homedir, buf) == 0)
2006: break;
2007:
2008: /*
2009: * dirname should always complete with a "/" path,
2010: * but we can be paranoid and check for "." too
2011: */
2012: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
2013: break;
2014: }
2015: return 0;
2016: }
2017:
2018: /*
2019: * Version of safe_path() that accepts an open file descriptor to
2020: * avoid races.
2021: *
2022: * Returns 0 on success and -1 on failure
2023: */
2024: int
2025: safe_path_fd(int fd, const char *file, struct passwd *pw,
2026: char *err, size_t errlen)
2027: {
2028: struct stat st;
2029:
2030: /* check the open file to avoid races */
1.139 deraadt 2031: if (fstat(fd, &st) == -1) {
1.112 djm 2032: snprintf(err, errlen, "cannot stat file %s: %s",
2033: file, strerror(errno));
2034: return -1;
2035: }
2036: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
2037: }
2038:
2039: /*
2040: * Sets the value of the given variable in the environment. If the variable
2041: * already exists, its value is overridden.
2042: */
2043: void
2044: child_set_env(char ***envp, u_int *envsizep, const char *name,
2045: const char *value)
2046: {
2047: char **env;
2048: u_int envsize;
2049: u_int i, namelen;
2050:
2051: if (strchr(name, '=') != NULL) {
2052: error("Invalid environment variable \"%.100s\"", name);
2053: return;
2054: }
2055:
2056: /*
2057: * Find the slot where the value should be stored. If the variable
2058: * already exists, we reuse the slot; otherwise we append a new slot
2059: * at the end of the array, expanding if necessary.
2060: */
2061: env = *envp;
2062: namelen = strlen(name);
2063: for (i = 0; env[i]; i++)
2064: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
2065: break;
2066: if (env[i]) {
2067: /* Reuse the slot. */
2068: free(env[i]);
2069: } else {
2070: /* New variable. Expand if necessary. */
2071: envsize = *envsizep;
2072: if (i >= envsize - 1) {
2073: if (envsize >= 1000)
2074: fatal("child_set_env: too many env vars");
2075: envsize += 50;
2076: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
2077: *envsizep = envsize;
2078: }
2079: /* Need to set the NULL pointer at end of array beyond the new slot. */
2080: env[i + 1] = NULL;
2081: }
2082:
2083: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 2084: /* XXX xasprintf */
1.112 djm 2085: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
2086: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
2087: }
2088:
1.114 millert 2089: /*
2090: * Check and optionally lowercase a domain name, also removes trailing '.'
2091: * Returns 1 on success and 0 on failure, storing an error message in errstr.
2092: */
2093: int
2094: valid_domain(char *name, int makelower, const char **errstr)
2095: {
2096: size_t i, l = strlen(name);
2097: u_char c, last = '\0';
2098: static char errbuf[256];
2099:
2100: if (l == 0) {
2101: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
2102: goto bad;
2103: }
2104: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
2105: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
2106: "starts with invalid character", name);
2107: goto bad;
2108: }
2109: for (i = 0; i < l; i++) {
2110: c = tolower((u_char)name[i]);
2111: if (makelower)
2112: name[i] = (char)c;
2113: if (last == '.' && c == '.') {
2114: snprintf(errbuf, sizeof(errbuf), "domain name "
2115: "\"%.100s\" contains consecutive separators", name);
2116: goto bad;
2117: }
2118: if (c != '.' && c != '-' && !isalnum(c) &&
2119: c != '_') /* technically invalid, but common */ {
2120: snprintf(errbuf, sizeof(errbuf), "domain name "
2121: "\"%.100s\" contains invalid characters", name);
2122: goto bad;
2123: }
2124: last = c;
2125: }
2126: if (name[l - 1] == '.')
2127: name[l - 1] = '\0';
2128: if (errstr != NULL)
2129: *errstr = NULL;
2130: return 1;
2131: bad:
2132: if (errstr != NULL)
2133: *errstr = errbuf;
2134: return 0;
1.132 djm 2135: }
2136:
2137: /*
2138: * Verify that a environment variable name (not including initial '$') is
2139: * valid; consisting of one or more alphanumeric or underscore characters only.
2140: * Returns 1 on valid, 0 otherwise.
2141: */
2142: int
2143: valid_env_name(const char *name)
2144: {
2145: const char *cp;
2146:
2147: if (name[0] == '\0')
2148: return 0;
2149: for (cp = name; *cp != '\0'; cp++) {
2150: if (!isalnum((u_char)*cp) && *cp != '_')
2151: return 0;
2152: }
2153: return 1;
1.120 dtucker 2154: }
2155:
2156: const char *
2157: atoi_err(const char *nptr, int *val)
2158: {
2159: const char *errstr = NULL;
2160: long long num;
2161:
2162: if (nptr == NULL || *nptr == '\0')
2163: return "missing";
2164: num = strtonum(nptr, 0, INT_MAX, &errstr);
2165: if (errstr == NULL)
2166: *val = (int)num;
2167: return errstr;
1.127 djm 2168: }
2169:
2170: int
2171: parse_absolute_time(const char *s, uint64_t *tp)
2172: {
2173: struct tm tm;
2174: time_t tt;
2175: char buf[32], *fmt;
2176:
2177: *tp = 0;
2178:
2179: /*
2180: * POSIX strptime says "The application shall ensure that there
2181: * is white-space or other non-alphanumeric characters between
2182: * any two conversion specifications" so arrange things this way.
2183: */
2184: switch (strlen(s)) {
2185: case 8: /* YYYYMMDD */
2186: fmt = "%Y-%m-%d";
2187: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
2188: break;
2189: case 12: /* YYYYMMDDHHMM */
2190: fmt = "%Y-%m-%dT%H:%M";
2191: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
2192: s, s + 4, s + 6, s + 8, s + 10);
2193: break;
2194: case 14: /* YYYYMMDDHHMMSS */
2195: fmt = "%Y-%m-%dT%H:%M:%S";
2196: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
2197: s, s + 4, s + 6, s + 8, s + 10, s + 12);
2198: break;
2199: default:
2200: return SSH_ERR_INVALID_FORMAT;
2201: }
2202:
2203: memset(&tm, 0, sizeof(tm));
2204: if (strptime(buf, fmt, &tm) == NULL)
2205: return SSH_ERR_INVALID_FORMAT;
2206: if ((tt = mktime(&tm)) < 0)
2207: return SSH_ERR_INVALID_FORMAT;
2208: /* success */
2209: *tp = (uint64_t)tt;
2210: return 0;
2211: }
2212:
2213: void
2214: format_absolute_time(uint64_t t, char *buf, size_t len)
2215: {
2216: time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */
2217: struct tm tm;
2218:
2219: localtime_r(&tt, &tm);
2220: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.134 djm 2221: }
2222:
2223: /* check if path is absolute */
2224: int
2225: path_absolute(const char *path)
2226: {
2227: return (*path == '/') ? 1 : 0;
1.141 djm 2228: }
2229:
2230: void
2231: skip_space(char **cpp)
2232: {
2233: char *cp;
2234:
2235: for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
2236: ;
2237: *cpp = cp;
1.114 millert 2238: }
1.142 djm 2239:
2240: /* authorized_key-style options parsing helpers */
2241:
2242: /*
2243: * Match flag 'opt' in *optsp, and if allow_negate is set then also match
2244: * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
2245: * if negated option matches.
2246: * If the option or negated option matches, then *optsp is updated to
2247: * point to the first character after the option.
2248: */
2249: int
2250: opt_flag(const char *opt, int allow_negate, const char **optsp)
2251: {
2252: size_t opt_len = strlen(opt);
2253: const char *opts = *optsp;
2254: int negate = 0;
2255:
2256: if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
2257: opts += 3;
2258: negate = 1;
2259: }
2260: if (strncasecmp(opts, opt, opt_len) == 0) {
2261: *optsp = opts + opt_len;
2262: return negate ? 0 : 1;
2263: }
2264: return -1;
2265: }
2266:
2267: char *
2268: opt_dequote(const char **sp, const char **errstrp)
2269: {
2270: const char *s = *sp;
2271: char *ret;
2272: size_t i;
2273:
2274: *errstrp = NULL;
2275: if (*s != '"') {
2276: *errstrp = "missing start quote";
2277: return NULL;
2278: }
2279: s++;
2280: if ((ret = malloc(strlen((s)) + 1)) == NULL) {
2281: *errstrp = "memory allocation failed";
2282: return NULL;
2283: }
2284: for (i = 0; *s != '\0' && *s != '"';) {
2285: if (s[0] == '\\' && s[1] == '"')
2286: s++;
2287: ret[i++] = *s++;
2288: }
2289: if (*s == '\0') {
2290: *errstrp = "missing end quote";
2291: free(ret);
2292: return NULL;
2293: }
2294: ret[i] = '\0';
2295: s++;
2296: *sp = s;
2297: return ret;
2298: }
2299:
2300: int
2301: opt_match(const char **opts, const char *term)
2302: {
2303: if (strncasecmp((*opts), term, strlen(term)) == 0 &&
2304: (*opts)[strlen(term)] == '=') {
2305: *opts += strlen(term) + 1;
2306: return 1;
2307: }
2308: return 0;
2309: }
2310:
1.144 dtucker 2311: sshsig_t
2312: ssh_signal(int signum, sshsig_t handler)
2313: {
2314: struct sigaction sa, osa;
2315:
2316: /* mask all other signals while in handler */
1.147 dtucker 2317: memset(&sa, 0, sizeof(sa));
1.144 dtucker 2318: sa.sa_handler = handler;
2319: sigfillset(&sa.sa_mask);
2320: if (signum != SIGALRM)
2321: sa.sa_flags = SA_RESTART;
2322: if (sigaction(signum, &sa, &osa) == -1) {
2323: debug3("sigaction(%s): %s", strsignal(signum), strerror(errno));
2324: return SIG_ERR;
2325: }
2326: return osa.sa_handler;
2327: }
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