Annotation of src/usr.bin/ssh/misc.c, Revision 1.185
1.185 ! dtucker 1: /* $OpenBSD: misc.c,v 1.184 2023/07/19 14:02:27 djm 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>
1.184 djm 43: #include <nlist.h>
1.136 djm 44: #include <poll.h>
1.112 djm 45: #include <signal.h>
1.57 stevesk 46: #include <stdarg.h>
1.63 stevesk 47: #include <stdio.h>
1.183 dtucker 48: #include <stdint.h>
1.62 stevesk 49: #include <stdlib.h>
1.60 stevesk 50: #include <string.h>
1.59 stevesk 51: #include <unistd.h>
1.1 markus 52:
1.64 deraadt 53: #include "xmalloc.h"
1.1 markus 54: #include "misc.h"
55: #include "log.h"
1.56 dtucker 56: #include "ssh.h"
1.112 djm 57: #include "sshbuf.h"
58: #include "ssherr.h"
1.1 markus 59:
1.12 markus 60: /* remove newline at end of string */
1.1 markus 61: char *
62: chop(char *s)
63: {
64: char *t = s;
65: while (*t) {
1.13 deraadt 66: if (*t == '\n' || *t == '\r') {
1.1 markus 67: *t = '\0';
68: return s;
69: }
70: t++;
71: }
72: return s;
73:
74: }
75:
1.166 djm 76: /* remove whitespace from end of string */
77: void
78: rtrim(char *s)
79: {
80: size_t i;
81:
82: if ((i = strlen(s)) == 0)
83: return;
84: for (i--; i > 0; i--) {
1.179 deraadt 85: if (isspace((unsigned char)s[i]))
1.166 djm 86: s[i] = '\0';
87: }
88: }
89:
1.12 markus 90: /* set/unset filedescriptor to non-blocking */
1.24 djm 91: int
1.1 markus 92: set_nonblock(int fd)
93: {
94: int val;
1.8 markus 95:
1.103 krw 96: val = fcntl(fd, F_GETFL);
1.139 deraadt 97: if (val == -1) {
1.103 krw 98: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 99: return (-1);
1.1 markus 100: }
101: if (val & O_NONBLOCK) {
1.24 djm 102: debug3("fd %d is O_NONBLOCK", fd);
103: return (0);
1.1 markus 104: }
1.21 markus 105: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 106: val |= O_NONBLOCK;
1.24 djm 107: if (fcntl(fd, F_SETFL, val) == -1) {
108: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
109: strerror(errno));
110: return (-1);
111: }
112: return (0);
1.8 markus 113: }
114:
1.24 djm 115: int
1.8 markus 116: unset_nonblock(int fd)
117: {
118: int val;
119:
1.103 krw 120: val = fcntl(fd, F_GETFL);
1.139 deraadt 121: if (val == -1) {
1.103 krw 122: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 123: return (-1);
1.8 markus 124: }
125: if (!(val & O_NONBLOCK)) {
1.24 djm 126: debug3("fd %d is not O_NONBLOCK", fd);
127: return (0);
1.8 markus 128: }
1.10 markus 129: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 130: val &= ~O_NONBLOCK;
1.24 djm 131: if (fcntl(fd, F_SETFL, val) == -1) {
132: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 133: fd, strerror(errno));
1.24 djm 134: return (-1);
135: }
136: return (0);
1.66 dtucker 137: }
138:
139: const char *
140: ssh_gai_strerror(int gaierr)
141: {
1.91 djm 142: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 143: return strerror(errno);
144: return gai_strerror(gaierr);
1.15 stevesk 145: }
146:
147: /* disable nagle on socket */
148: void
149: set_nodelay(int fd)
150: {
1.17 stevesk 151: int opt;
152: socklen_t optlen;
1.15 stevesk 153:
1.16 stevesk 154: optlen = sizeof opt;
155: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 156: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 157: return;
158: }
159: if (opt == 1) {
160: debug2("fd %d is TCP_NODELAY", fd);
161: return;
162: }
163: opt = 1;
1.20 markus 164: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 165: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 166: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.117 djm 167: }
168:
169: /* Allow local port reuse in TIME_WAIT */
170: int
171: set_reuseaddr(int fd)
172: {
173: int on = 1;
174:
175: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
176: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
177: return -1;
178: }
179: return 0;
180: }
181:
1.118 djm 182: /* Get/set routing domain */
183: char *
184: get_rdomain(int fd)
185: {
186: int rtable;
187: char *ret;
188: socklen_t len = sizeof(rtable);
189:
190: if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
191: error("Failed to get routing domain for fd %d: %s",
192: fd, strerror(errno));
193: return NULL;
194: }
195: xasprintf(&ret, "%d", rtable);
196: return ret;
197: }
198:
1.117 djm 199: int
200: set_rdomain(int fd, const char *name)
201: {
202: int rtable;
203: const char *errstr;
204:
205: if (name == NULL)
206: return 0; /* default table */
207:
208: rtable = (int)strtonum(name, 0, 255, &errstr);
209: if (errstr != NULL) {
210: /* Shouldn't happen */
211: error("Invalid routing domain \"%s\": %s", name, errstr);
212: return -1;
213: }
214: if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
215: &rtable, sizeof(rtable)) == -1) {
216: error("Failed to set routing domain %d on fd %d: %s",
217: rtable, fd, strerror(errno));
218: return -1;
219: }
1.136 djm 220: return 0;
1.156 djm 221: }
222:
223: int
224: get_sock_af(int fd)
225: {
226: struct sockaddr_storage to;
227: socklen_t tolen = sizeof(to);
228:
229: memset(&to, 0, sizeof(to));
230: if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1)
231: return -1;
232: return to.ss_family;
233: }
234:
235: void
236: set_sock_tos(int fd, int tos)
237: {
238: int af;
239:
240: switch ((af = get_sock_af(fd))) {
241: case -1:
242: /* assume not a socket */
243: break;
244: case AF_INET:
245: debug3_f("set socket %d IP_TOS 0x%02x", fd, tos);
246: if (setsockopt(fd, IPPROTO_IP, IP_TOS,
247: &tos, sizeof(tos)) == -1) {
1.178 dtucker 248: error("setsockopt socket %d IP_TOS %d: %s",
1.156 djm 249: fd, tos, strerror(errno));
250: }
251: break;
252: case AF_INET6:
253: debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos);
254: if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS,
255: &tos, sizeof(tos)) == -1) {
1.178 dtucker 256: error("setsockopt socket %d IPV6_TCLASS %d: %s",
1.156 djm 257: fd, tos, strerror(errno));
258: }
259: break;
260: default:
261: debug2_f("unsupported socket family %d", af);
262: break;
263: }
1.136 djm 264: }
265:
266: /*
1.143 dtucker 267: * Wait up to *timeoutp milliseconds for events on fd. Updates
1.136 djm 268: * *timeoutp with time remaining.
269: * Returns 0 if fd ready or -1 on timeout or error (see errno).
270: */
1.143 dtucker 271: static int
272: waitfd(int fd, int *timeoutp, short events)
1.136 djm 273: {
274: struct pollfd pfd;
275: struct timeval t_start;
1.185 ! dtucker 276: int oerrno, r, have_timeout = (*timeoutp >= 0);
1.136 djm 277:
278: pfd.fd = fd;
1.143 dtucker 279: pfd.events = events;
1.185 ! dtucker 280: for (; !have_timeout || *timeoutp >= 0;) {
1.159 dtucker 281: monotime_tv(&t_start);
1.136 djm 282: r = poll(&pfd, 1, *timeoutp);
283: oerrno = errno;
1.185 ! dtucker 284: if (have_timeout)
! 285: ms_subtract_diff(&t_start, timeoutp);
1.136 djm 286: errno = oerrno;
287: if (r > 0)
288: return 0;
1.153 djm 289: else if (r == -1 && errno != EAGAIN && errno != EINTR)
1.136 djm 290: return -1;
291: else if (r == 0)
292: break;
293: }
294: /* timeout */
295: errno = ETIMEDOUT;
296: return -1;
297: }
298:
299: /*
1.143 dtucker 300: * Wait up to *timeoutp milliseconds for fd to be readable. Updates
301: * *timeoutp with time remaining.
302: * Returns 0 if fd ready or -1 on timeout or error (see errno).
303: */
304: int
305: waitrfd(int fd, int *timeoutp) {
306: return waitfd(fd, timeoutp, POLLIN);
307: }
308:
309: /*
1.136 djm 310: * Attempt a non-blocking connect(2) to the specified address, waiting up to
311: * *timeoutp milliseconds for the connection to complete. If the timeout is
312: * <=0, then wait indefinitely.
313: *
314: * Returns 0 on success or -1 on failure.
315: */
316: int
317: timeout_connect(int sockfd, const struct sockaddr *serv_addr,
318: socklen_t addrlen, int *timeoutp)
319: {
320: int optval = 0;
321: socklen_t optlen = sizeof(optval);
322:
323: /* No timeout: just do a blocking connect() */
324: if (timeoutp == NULL || *timeoutp <= 0)
325: return connect(sockfd, serv_addr, addrlen);
326:
327: set_nonblock(sockfd);
1.153 djm 328: for (;;) {
329: if (connect(sockfd, serv_addr, addrlen) == 0) {
330: /* Succeeded already? */
331: unset_nonblock(sockfd);
332: return 0;
333: } else if (errno == EINTR)
334: continue;
335: else if (errno != EINPROGRESS)
336: return -1;
337: break;
338: }
1.136 djm 339:
1.143 dtucker 340: if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
1.136 djm 341: return -1;
342:
343: /* Completed or failed */
344: if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
345: debug("getsockopt: %s", strerror(errno));
346: return -1;
347: }
348: if (optval != 0) {
349: errno = optval;
350: return -1;
351: }
352: unset_nonblock(sockfd);
1.117 djm 353: return 0;
1.72 reyk 354: }
355:
1.1 markus 356: /* Characters considered whitespace in strsep calls. */
357: #define WHITESPACE " \t\r\n"
1.46 dtucker 358: #define QUOTE "\""
1.1 markus 359:
1.12 markus 360: /* return next token in configuration line */
1.129 djm 361: static char *
362: strdelim_internal(char **s, int split_equals)
1.1 markus 363: {
1.126 djm 364: char *old;
1.1 markus 365: int wspace = 0;
366:
367: if (*s == NULL)
368: return NULL;
369:
370: old = *s;
371:
1.129 djm 372: *s = strpbrk(*s,
373: split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
1.1 markus 374: if (*s == NULL)
375: return (old);
376:
1.46 dtucker 377: if (*s[0] == '\"') {
378: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
379: /* Find matching quote */
1.126 djm 380: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
381: return (NULL); /* no matching quote */
382: } else {
383: *s[0] = '\0';
384: *s += strspn(*s + 1, WHITESPACE) + 1;
385: return (old);
1.46 dtucker 386: }
387: }
388:
1.1 markus 389: /* Allow only one '=' to be skipped */
1.129 djm 390: if (split_equals && *s[0] == '=')
1.1 markus 391: wspace = 1;
392: *s[0] = '\0';
393:
1.46 dtucker 394: /* Skip any extra whitespace after first token */
1.1 markus 395: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 396: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 397: *s += strspn(*s + 1, WHITESPACE) + 1;
398:
399: return (old);
1.129 djm 400: }
401:
402: /*
403: * Return next token in configuration line; splts on whitespace or a
404: * single '=' character.
405: */
406: char *
407: strdelim(char **s)
408: {
409: return strdelim_internal(s, 1);
410: }
411:
412: /*
413: * Return next token in configuration line; splts on whitespace only.
414: */
415: char *
416: strdelimw(char **s)
417: {
418: return strdelim_internal(s, 0);
1.2 markus 419: }
420:
421: struct passwd *
422: pwcopy(struct passwd *pw)
423: {
1.49 djm 424: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 425:
1.2 markus 426: copy->pw_name = xstrdup(pw->pw_name);
427: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 428: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 429: copy->pw_uid = pw->pw_uid;
430: copy->pw_gid = pw->pw_gid;
1.11 markus 431: copy->pw_expire = pw->pw_expire;
432: copy->pw_change = pw->pw_change;
1.2 markus 433: copy->pw_class = xstrdup(pw->pw_class);
434: copy->pw_dir = xstrdup(pw->pw_dir);
435: copy->pw_shell = xstrdup(pw->pw_shell);
436: return copy;
1.5 stevesk 437: }
438:
1.12 markus 439: /*
440: * Convert ASCII string to TCP/IP port number.
1.70 djm 441: * Port must be >=0 and <=65535.
442: * Return -1 if invalid.
1.12 markus 443: */
444: int
445: a2port(const char *s)
1.5 stevesk 446: {
1.133 naddy 447: struct servent *se;
1.70 djm 448: long long port;
449: const char *errstr;
1.5 stevesk 450:
1.70 djm 451: port = strtonum(s, 0, 65535, &errstr);
1.133 naddy 452: if (errstr == NULL)
453: return (int)port;
454: if ((se = getservbyname(s, "tcp")) != NULL)
455: return ntohs(se->s_port);
456: return -1;
1.9 stevesk 457: }
458:
1.36 reyk 459: int
460: a2tun(const char *s, int *remote)
461: {
462: const char *errstr = NULL;
463: char *sp, *ep;
464: int tun;
465:
466: if (remote != NULL) {
1.37 reyk 467: *remote = SSH_TUNID_ANY;
1.36 reyk 468: sp = xstrdup(s);
469: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 470: free(sp);
1.36 reyk 471: return (a2tun(s, NULL));
472: }
473: ep[0] = '\0'; ep++;
474: *remote = a2tun(ep, NULL);
475: tun = a2tun(sp, NULL);
1.89 djm 476: free(sp);
1.37 reyk 477: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 478: }
479:
480: if (strcasecmp(s, "any") == 0)
1.37 reyk 481: return (SSH_TUNID_ANY);
1.36 reyk 482:
1.37 reyk 483: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
484: if (errstr != NULL)
485: return (SSH_TUNID_ERR);
1.36 reyk 486:
487: return (tun);
488: }
489:
1.9 stevesk 490: #define SECONDS 1
491: #define MINUTES (SECONDS * 60)
492: #define HOURS (MINUTES * 60)
493: #define DAYS (HOURS * 24)
494: #define WEEKS (DAYS * 7)
495:
1.12 markus 496: /*
497: * Convert a time string into seconds; format is
498: * a sequence of:
499: * time[qualifier]
500: *
501: * Valid time qualifiers are:
502: * <none> seconds
503: * s|S seconds
504: * m|M minutes
505: * h|H hours
506: * d|D days
507: * w|W weeks
508: *
509: * Examples:
510: * 90m 90 minutes
511: * 1h30m 90 minutes
512: * 2d 2 days
513: * 1w 1 week
514: *
515: * Return -1 if time string is invalid.
516: */
1.158 dtucker 517: int
1.12 markus 518: convtime(const char *s)
1.9 stevesk 519: {
1.149 dtucker 520: long total, secs, multiplier;
1.9 stevesk 521: const char *p;
522: char *endp;
523:
524: errno = 0;
525: total = 0;
526: p = s;
527:
528: if (p == NULL || *p == '\0')
529: return -1;
530:
531: while (*p) {
532: secs = strtol(p, &endp, 10);
533: if (p == endp ||
1.158 dtucker 534: (errno == ERANGE && (secs == INT_MIN || secs == INT_MAX)) ||
1.9 stevesk 535: secs < 0)
536: return -1;
537:
1.149 dtucker 538: multiplier = 1;
1.9 stevesk 539: switch (*endp++) {
540: case '\0':
541: endp--;
1.48 deraadt 542: break;
1.9 stevesk 543: case 's':
544: case 'S':
545: break;
546: case 'm':
547: case 'M':
1.108 dtucker 548: multiplier = MINUTES;
1.9 stevesk 549: break;
550: case 'h':
551: case 'H':
1.108 dtucker 552: multiplier = HOURS;
1.9 stevesk 553: break;
554: case 'd':
555: case 'D':
1.108 dtucker 556: multiplier = DAYS;
1.9 stevesk 557: break;
558: case 'w':
559: case 'W':
1.108 dtucker 560: multiplier = WEEKS;
1.9 stevesk 561: break;
562: default:
563: return -1;
564: }
1.160 dtucker 565: if (secs > INT_MAX / multiplier)
1.108 dtucker 566: return -1;
567: secs *= multiplier;
1.160 dtucker 568: if (total > INT_MAX - secs)
1.108 dtucker 569: return -1;
1.9 stevesk 570: total += secs;
571: if (total < 0)
572: return -1;
573: p = endp;
574: }
575:
576: return total;
1.148 djm 577: }
578:
579: #define TF_BUFS 8
580: #define TF_LEN 9
581:
582: const char *
583: fmt_timeframe(time_t t)
584: {
585: char *buf;
586: static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */
587: static int idx = 0;
588: unsigned int sec, min, hrs, day;
589: unsigned long long week;
590:
591: buf = tfbuf[idx++];
592: if (idx == TF_BUFS)
593: idx = 0;
594:
595: week = t;
596:
597: sec = week % 60;
598: week /= 60;
599: min = week % 60;
600: week /= 60;
601: hrs = week % 24;
602: week /= 24;
603: day = week % 7;
604: week /= 7;
605:
606: if (week > 0)
607: snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
608: else if (day > 0)
609: snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
610: else
611: snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);
612:
613: return (buf);
1.56 dtucker 614: }
615:
616: /*
617: * Returns a standardized host+port identifier string.
618: * Caller must free returned string.
619: */
620: char *
621: put_host_port(const char *host, u_short port)
622: {
623: char *hoststr;
624:
625: if (port == 0 || port == SSH_DEFAULT_PORT)
626: return(xstrdup(host));
1.138 deraadt 627: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
1.56 dtucker 628: fatal("put_host_port: asprintf: %s", strerror(errno));
629: debug3("put_host_port: %s", hoststr);
630: return hoststr;
1.28 djm 631: }
632:
633: /*
634: * Search for next delimiter between hostnames/addresses and ports.
635: * Argument may be modified (for termination).
636: * Returns *cp if parsing succeeds.
1.114 millert 637: * *cp is set to the start of the next field, if one was found.
638: * The delimiter char, if present, is stored in delim.
1.28 djm 639: * If this is the last field, *cp is set to NULL.
640: */
1.137 dtucker 641: char *
1.114 millert 642: hpdelim2(char **cp, char *delim)
1.28 djm 643: {
644: char *s, *old;
645:
646: if (cp == NULL || *cp == NULL)
647: return NULL;
648:
649: old = s = *cp;
650: if (*s == '[') {
651: if ((s = strchr(s, ']')) == NULL)
652: return NULL;
653: else
654: s++;
655: } else if ((s = strpbrk(s, ":/")) == NULL)
656: s = *cp + strlen(*cp); /* skip to end (see first case below) */
657:
658: switch (*s) {
659: case '\0':
660: *cp = NULL; /* no more fields*/
661: break;
1.29 deraadt 662:
1.28 djm 663: case ':':
664: case '/':
1.114 millert 665: if (delim != NULL)
666: *delim = *s;
1.28 djm 667: *s = '\0'; /* terminate */
668: *cp = s + 1;
669: break;
1.29 deraadt 670:
1.28 djm 671: default:
672: return NULL;
673: }
674:
675: return old;
1.6 mouring 676: }
677:
1.173 dtucker 678: /* The common case: only accept colon as delimiter. */
1.6 mouring 679: char *
1.114 millert 680: hpdelim(char **cp)
681: {
1.174 dtucker 682: char *r, delim = '\0';
1.173 dtucker 683:
684: r = hpdelim2(cp, &delim);
685: if (delim == '/')
686: return NULL;
687: return r;
1.114 millert 688: }
689:
690: char *
1.6 mouring 691: cleanhostname(char *host)
692: {
693: if (*host == '[' && host[strlen(host) - 1] == ']') {
694: host[strlen(host) - 1] = '\0';
695: return (host + 1);
696: } else
697: return host;
698: }
699:
700: char *
701: colon(char *cp)
702: {
703: int flag = 0;
704:
705: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 706: return NULL;
1.6 mouring 707: if (*cp == '[')
708: flag = 1;
709:
710: for (; *cp; ++cp) {
711: if (*cp == '@' && *(cp+1) == '[')
712: flag = 1;
713: if (*cp == ']' && *(cp+1) == ':' && flag)
714: return (cp+1);
715: if (*cp == ':' && !flag)
716: return (cp);
717: if (*cp == '/')
1.76 djm 718: return NULL;
1.6 mouring 719: }
1.76 djm 720: return NULL;
1.105 djm 721: }
722:
723: /*
1.114 millert 724: * Parse a [user@]host:[path] string.
725: * Caller must free returned user, host and path.
726: * Any of the pointer return arguments may be NULL (useful for syntax checking).
727: * If user was not specified then *userp will be set to NULL.
728: * If host was not specified then *hostp will be set to NULL.
729: * If path was not specified then *pathp will be set to ".".
730: * Returns 0 on success, -1 on failure.
731: */
732: int
733: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
734: {
735: char *user = NULL, *host = NULL, *path = NULL;
736: char *sdup, *tmp;
737: int ret = -1;
738:
739: if (userp != NULL)
740: *userp = NULL;
741: if (hostp != NULL)
742: *hostp = NULL;
743: if (pathp != NULL)
744: *pathp = NULL;
745:
1.116 millert 746: sdup = xstrdup(s);
1.114 millert 747:
748: /* Check for remote syntax: [user@]host:[path] */
749: if ((tmp = colon(sdup)) == NULL)
750: goto out;
751:
752: /* Extract optional path */
753: *tmp++ = '\0';
754: if (*tmp == '\0')
755: tmp = ".";
756: path = xstrdup(tmp);
757:
758: /* Extract optional user and mandatory host */
759: tmp = strrchr(sdup, '@');
760: if (tmp != NULL) {
761: *tmp++ = '\0';
762: host = xstrdup(cleanhostname(tmp));
763: if (*sdup != '\0')
764: user = xstrdup(sdup);
765: } else {
766: host = xstrdup(cleanhostname(sdup));
767: user = NULL;
768: }
769:
770: /* Success */
771: if (userp != NULL) {
772: *userp = user;
773: user = NULL;
774: }
775: if (hostp != NULL) {
776: *hostp = host;
777: host = NULL;
1.116 millert 778: }
1.114 millert 779: if (pathp != NULL) {
780: *pathp = path;
781: path = NULL;
1.116 millert 782: }
1.114 millert 783: ret = 0;
784: out:
785: free(sdup);
786: free(user);
787: free(host);
788: free(path);
789: return ret;
790: }
791:
792: /*
1.105 djm 793: * Parse a [user@]host[:port] string.
794: * Caller must free returned user and host.
795: * Any of the pointer return arguments may be NULL (useful for syntax checking).
796: * If user was not specified then *userp will be set to NULL.
797: * If port was not specified then *portp will be -1.
798: * Returns 0 on success, -1 on failure.
799: */
800: int
801: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
802: {
803: char *sdup, *cp, *tmp;
804: char *user = NULL, *host = NULL;
805: int port = -1, ret = -1;
806:
807: if (userp != NULL)
808: *userp = NULL;
809: if (hostp != NULL)
810: *hostp = NULL;
811: if (portp != NULL)
812: *portp = -1;
813:
814: if ((sdup = tmp = strdup(s)) == NULL)
815: return -1;
816: /* Extract optional username */
1.114 millert 817: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 818: *cp = '\0';
819: if (*tmp == '\0')
820: goto out;
821: if ((user = strdup(tmp)) == NULL)
822: goto out;
823: tmp = cp + 1;
824: }
825: /* Extract mandatory hostname */
826: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
827: goto out;
828: host = xstrdup(cleanhostname(cp));
829: /* Convert and verify optional port */
830: if (tmp != NULL && *tmp != '\0') {
831: if ((port = a2port(tmp)) <= 0)
832: goto out;
833: }
834: /* Success */
835: if (userp != NULL) {
836: *userp = user;
837: user = NULL;
838: }
839: if (hostp != NULL) {
840: *hostp = host;
841: host = NULL;
842: }
843: if (portp != NULL)
844: *portp = port;
845: ret = 0;
846: out:
847: free(sdup);
848: free(user);
849: free(host);
850: return ret;
1.7 mouring 851: }
852:
1.114 millert 853: /*
854: * Converts a two-byte hex string to decimal.
855: * Returns the decimal value or -1 for invalid input.
856: */
857: static int
858: hexchar(const char *s)
859: {
860: unsigned char result[2];
861: int i;
862:
863: for (i = 0; i < 2; i++) {
864: if (s[i] >= '0' && s[i] <= '9')
865: result[i] = (unsigned char)(s[i] - '0');
866: else if (s[i] >= 'a' && s[i] <= 'f')
867: result[i] = (unsigned char)(s[i] - 'a') + 10;
868: else if (s[i] >= 'A' && s[i] <= 'F')
869: result[i] = (unsigned char)(s[i] - 'A') + 10;
870: else
871: return -1;
872: }
873: return (result[0] << 4) | result[1];
874: }
875:
876: /*
877: * Decode an url-encoded string.
878: * Returns a newly allocated string on success or NULL on failure.
879: */
880: static char *
881: urldecode(const char *src)
882: {
883: char *ret, *dst;
884: int ch;
1.182 djm 885: size_t srclen;
1.114 millert 886:
1.182 djm 887: if ((srclen = strlen(src)) >= SIZE_MAX)
888: fatal_f("input too large");
889: ret = xmalloc(srclen + 1);
1.114 millert 890: for (dst = ret; *src != '\0'; src++) {
891: switch (*src) {
892: case '+':
893: *dst++ = ' ';
894: break;
895: case '%':
896: if (!isxdigit((unsigned char)src[1]) ||
897: !isxdigit((unsigned char)src[2]) ||
898: (ch = hexchar(src + 1)) == -1) {
899: free(ret);
900: return NULL;
901: }
902: *dst++ = ch;
903: src += 2;
904: break;
905: default:
906: *dst++ = *src;
907: break;
908: }
909: }
910: *dst = '\0';
911:
912: return ret;
913: }
914:
915: /*
916: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
917: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
918: * Either user or path may be url-encoded (but not host or port).
919: * Caller must free returned user, host and path.
920: * Any of the pointer return arguments may be NULL (useful for syntax checking)
921: * but the scheme must always be specified.
922: * If user was not specified then *userp will be set to NULL.
923: * If port was not specified then *portp will be -1.
924: * If path was not specified then *pathp will be set to NULL.
925: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
926: */
927: int
928: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
929: int *portp, char **pathp)
930: {
931: char *uridup, *cp, *tmp, ch;
932: char *user = NULL, *host = NULL, *path = NULL;
933: int port = -1, ret = -1;
934: size_t len;
935:
936: len = strlen(scheme);
937: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
938: return 1;
939: uri += len + 3;
940:
941: if (userp != NULL)
942: *userp = NULL;
943: if (hostp != NULL)
944: *hostp = NULL;
945: if (portp != NULL)
946: *portp = -1;
947: if (pathp != NULL)
948: *pathp = NULL;
949:
950: uridup = tmp = xstrdup(uri);
951:
952: /* Extract optional ssh-info (username + connection params) */
953: if ((cp = strchr(tmp, '@')) != NULL) {
954: char *delim;
955:
956: *cp = '\0';
957: /* Extract username and connection params */
958: if ((delim = strchr(tmp, ';')) != NULL) {
959: /* Just ignore connection params for now */
960: *delim = '\0';
961: }
962: if (*tmp == '\0') {
963: /* Empty username */
964: goto out;
965: }
966: if ((user = urldecode(tmp)) == NULL)
967: goto out;
968: tmp = cp + 1;
969: }
970:
971: /* Extract mandatory hostname */
972: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
973: goto out;
974: host = xstrdup(cleanhostname(cp));
975: if (!valid_domain(host, 0, NULL))
976: goto out;
977:
978: if (tmp != NULL && *tmp != '\0') {
979: if (ch == ':') {
980: /* Convert and verify port. */
981: if ((cp = strchr(tmp, '/')) != NULL)
982: *cp = '\0';
983: if ((port = a2port(tmp)) <= 0)
984: goto out;
985: tmp = cp ? cp + 1 : NULL;
986: }
987: if (tmp != NULL && *tmp != '\0') {
988: /* Extract optional path */
989: if ((path = urldecode(tmp)) == NULL)
990: goto out;
991: }
992: }
993:
994: /* Success */
995: if (userp != NULL) {
996: *userp = user;
997: user = NULL;
998: }
999: if (hostp != NULL) {
1000: *hostp = host;
1001: host = NULL;
1002: }
1003: if (portp != NULL)
1004: *portp = port;
1005: if (pathp != NULL) {
1006: *pathp = path;
1007: path = NULL;
1008: }
1009: ret = 0;
1010: out:
1011: free(uridup);
1012: free(user);
1013: free(host);
1014: free(path);
1015: return ret;
1016: }
1017:
1.12 markus 1018: /* function to assist building execv() arguments */
1.7 mouring 1019: void
1020: addargs(arglist *args, char *fmt, ...)
1021: {
1022: va_list ap;
1.42 djm 1023: char *cp;
1.25 avsm 1024: u_int nalloc;
1.42 djm 1025: int r;
1.7 mouring 1026:
1027: va_start(ap, fmt);
1.42 djm 1028: r = vasprintf(&cp, fmt, ap);
1.7 mouring 1029: va_end(ap);
1.42 djm 1030: if (r == -1)
1.175 djm 1031: fatal_f("argument too long");
1.7 mouring 1032:
1.22 markus 1033: nalloc = args->nalloc;
1.7 mouring 1034: if (args->list == NULL) {
1.22 markus 1035: nalloc = 32;
1.7 mouring 1036: args->num = 0;
1.175 djm 1037: } else if (args->num > (256 * 1024))
1038: fatal_f("too many arguments");
1039: else if (args->num >= args->nalloc)
1040: fatal_f("arglist corrupt");
1041: else if (args->num+2 >= nalloc)
1.22 markus 1042: nalloc *= 2;
1.7 mouring 1043:
1.175 djm 1044: args->list = xrecallocarray(args->list, args->nalloc,
1045: nalloc, sizeof(char *));
1.22 markus 1046: args->nalloc = nalloc;
1.42 djm 1047: args->list[args->num++] = cp;
1.7 mouring 1048: args->list[args->num] = NULL;
1.42 djm 1049: }
1050:
1051: void
1052: replacearg(arglist *args, u_int which, char *fmt, ...)
1053: {
1054: va_list ap;
1055: char *cp;
1056: int r;
1057:
1058: va_start(ap, fmt);
1059: r = vasprintf(&cp, fmt, ap);
1060: va_end(ap);
1061: if (r == -1)
1.175 djm 1062: fatal_f("argument too long");
1063: if (args->list == NULL || args->num >= args->nalloc)
1064: fatal_f("arglist corrupt");
1.42 djm 1065:
1066: if (which >= args->num)
1.175 djm 1067: fatal_f("tried to replace invalid arg %d >= %d",
1.42 djm 1068: which, args->num);
1.89 djm 1069: free(args->list[which]);
1.42 djm 1070: args->list[which] = cp;
1071: }
1072:
1073: void
1074: freeargs(arglist *args)
1075: {
1076: u_int i;
1077:
1.175 djm 1078: if (args == NULL)
1079: return;
1080: if (args->list != NULL && args->num < args->nalloc) {
1.42 djm 1081: for (i = 0; i < args->num; i++)
1.89 djm 1082: free(args->list[i]);
1083: free(args->list);
1.42 djm 1084: }
1.175 djm 1085: args->nalloc = args->num = 0;
1086: args->list = NULL;
1.30 djm 1087: }
1088:
1089: /*
1090: * Expands tildes in the file name. Returns data allocated by xmalloc.
1091: * Warning: this calls getpw*.
1092: */
1.169 djm 1093: int
1094: tilde_expand(const char *filename, uid_t uid, char **retp)
1.30 djm 1095: {
1.172 djm 1096: char *ocopy = NULL, *copy, *s = NULL;
1097: const char *path = NULL, *user = NULL;
1.30 djm 1098: struct passwd *pw;
1.172 djm 1099: size_t len;
1100: int ret = -1, r, slash;
1.30 djm 1101:
1.172 djm 1102: *retp = NULL;
1.169 djm 1103: if (*filename != '~') {
1104: *retp = xstrdup(filename);
1105: return 0;
1106: }
1.172 djm 1107: ocopy = copy = xstrdup(filename + 1);
1.30 djm 1108:
1.172 djm 1109: if (*copy == '\0') /* ~ */
1110: path = NULL;
1111: else if (*copy == '/') {
1112: copy += strspn(copy, "/");
1113: if (*copy == '\0')
1114: path = NULL; /* ~/ */
1115: else
1116: path = copy; /* ~/path */
1117: } else {
1118: user = copy;
1119: if ((path = strchr(copy, '/')) != NULL) {
1120: copy[path - copy] = '\0';
1121: path++;
1122: path += strspn(path, "/");
1123: if (*path == '\0') /* ~user/ */
1124: path = NULL;
1125: /* else ~user/path */
1.169 djm 1126: }
1.172 djm 1127: /* else ~user */
1128: }
1129: if (user != NULL) {
1.169 djm 1130: if ((pw = getpwnam(user)) == NULL) {
1131: error_f("No such user %s", user);
1.172 djm 1132: goto out;
1.169 djm 1133: }
1.172 djm 1134: } else if ((pw = getpwuid(uid)) == NULL) {
1.169 djm 1135: error_f("No such uid %ld", (long)uid);
1.172 djm 1136: goto out;
1.169 djm 1137: }
1.30 djm 1138:
1139: /* Make sure directory has a trailing '/' */
1.172 djm 1140: slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/';
1.30 djm 1141:
1.172 djm 1142: if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir,
1143: slash ? "/" : "", path != NULL ? path : "")) <= 0) {
1144: error_f("xasprintf failed");
1145: goto out;
1146: }
1147: if (r >= PATH_MAX) {
1.169 djm 1148: error_f("Path too long");
1.172 djm 1149: goto out;
1.169 djm 1150: }
1.172 djm 1151: /* success */
1152: ret = 0;
1153: *retp = s;
1154: s = NULL;
1155: out:
1156: free(s);
1157: free(ocopy);
1158: return ret;
1.169 djm 1159: }
1160:
1161: char *
1162: tilde_expand_filename(const char *filename, uid_t uid)
1163: {
1164: char *ret;
1.30 djm 1165:
1.169 djm 1166: if (tilde_expand(filename, uid, &ret) != 0)
1167: cleanup_exit(255);
1168: return ret;
1.31 djm 1169: }
1170:
1171: /*
1.150 dtucker 1172: * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT}
1173: * substitutions. A number of escapes may be specified as
1174: * (char *escape_chars, char *replacement) pairs. The list must be terminated
1175: * by a NULL escape_char. Returns replaced string in memory allocated by
1176: * xmalloc which the caller must free.
1.31 djm 1177: */
1.150 dtucker 1178: static char *
1179: vdollar_percent_expand(int *parseerror, int dollar, int percent,
1180: const char *string, va_list ap)
1.31 djm 1181: {
1182: #define EXPAND_MAX_KEYS 16
1.150 dtucker 1183: u_int num_keys = 0, i;
1.31 djm 1184: struct {
1185: const char *key;
1186: const char *repl;
1187: } keys[EXPAND_MAX_KEYS];
1.140 djm 1188: struct sshbuf *buf;
1.150 dtucker 1189: int r, missingvar = 0;
1190: char *ret = NULL, *var, *varend, *val;
1191: size_t len;
1.140 djm 1192:
1193: if ((buf = sshbuf_new()) == NULL)
1.155 djm 1194: fatal_f("sshbuf_new failed");
1.150 dtucker 1195: if (parseerror == NULL)
1.155 djm 1196: fatal_f("null parseerror arg");
1.150 dtucker 1197: *parseerror = 1;
1198:
1199: /* Gather keys if we're doing percent expansion. */
1200: if (percent) {
1201: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
1202: keys[num_keys].key = va_arg(ap, char *);
1203: if (keys[num_keys].key == NULL)
1204: break;
1205: keys[num_keys].repl = va_arg(ap, char *);
1.155 djm 1206: if (keys[num_keys].repl == NULL) {
1207: fatal_f("NULL replacement for token %s",
1208: keys[num_keys].key);
1209: }
1.150 dtucker 1210: }
1211: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
1.155 djm 1212: fatal_f("too many keys");
1.150 dtucker 1213: if (num_keys == 0)
1.155 djm 1214: fatal_f("percent expansion without token list");
1.31 djm 1215: }
1216:
1217: /* Expand string */
1218: for (i = 0; *string != '\0'; string++) {
1.150 dtucker 1219: /* Optionally process ${ENVIRONMENT} expansions. */
1220: if (dollar && string[0] == '$' && string[1] == '{') {
1221: string += 2; /* skip over '${' */
1222: if ((varend = strchr(string, '}')) == NULL) {
1.155 djm 1223: error_f("environment variable '%s' missing "
1.164 djm 1224: "closing '}'", string);
1.150 dtucker 1225: goto out;
1226: }
1227: len = varend - string;
1228: if (len == 0) {
1.155 djm 1229: error_f("zero-length environment variable");
1.150 dtucker 1230: goto out;
1231: }
1232: var = xmalloc(len + 1);
1233: (void)strlcpy(var, string, len + 1);
1234: if ((val = getenv(var)) == NULL) {
1.155 djm 1235: error_f("env var ${%s} has no value", var);
1.150 dtucker 1236: missingvar = 1;
1237: } else {
1.155 djm 1238: debug3_f("expand ${%s} -> '%s'", var, val);
1.150 dtucker 1239: if ((r = sshbuf_put(buf, val, strlen(val))) !=0)
1.155 djm 1240: fatal_fr(r, "sshbuf_put ${}");
1.150 dtucker 1241: }
1242: free(var);
1243: string += len;
1244: continue;
1245: }
1246:
1247: /*
1248: * Process percent expansions if we have a list of TOKENs.
1249: * If we're not doing percent expansion everything just gets
1250: * appended here.
1251: */
1252: if (*string != '%' || !percent) {
1.31 djm 1253: append:
1.155 djm 1254: if ((r = sshbuf_put_u8(buf, *string)) != 0)
1255: fatal_fr(r, "sshbuf_put_u8 %%");
1.31 djm 1256: continue;
1257: }
1258: string++;
1.73 djm 1259: /* %% case */
1.31 djm 1260: if (*string == '%')
1261: goto append;
1.150 dtucker 1262: if (*string == '\0') {
1.155 djm 1263: error_f("invalid format");
1.150 dtucker 1264: goto out;
1265: }
1.140 djm 1266: for (i = 0; i < num_keys; i++) {
1267: if (strchr(keys[i].key, *string) != NULL) {
1268: if ((r = sshbuf_put(buf, keys[i].repl,
1.155 djm 1269: strlen(keys[i].repl))) != 0)
1270: fatal_fr(r, "sshbuf_put %%-repl");
1.31 djm 1271: break;
1272: }
1273: }
1.150 dtucker 1274: if (i >= num_keys) {
1.155 djm 1275: error_f("unknown key %%%c", *string);
1.150 dtucker 1276: goto out;
1277: }
1.31 djm 1278: }
1.150 dtucker 1279: if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL)
1.155 djm 1280: fatal_f("sshbuf_dup_string failed");
1.150 dtucker 1281: *parseerror = 0;
1282: out:
1.140 djm 1283: sshbuf_free(buf);
1.150 dtucker 1284: return *parseerror ? NULL : ret;
1285: #undef EXPAND_MAX_KEYS
1286: }
1287:
1.152 dtucker 1288: /*
1289: * Expand only environment variables.
1290: * Note that although this function is variadic like the other similar
1291: * functions, any such arguments will be unused.
1292: */
1293:
1.150 dtucker 1294: char *
1.152 dtucker 1295: dollar_expand(int *parseerr, const char *string, ...)
1.150 dtucker 1296: {
1297: char *ret;
1298: int err;
1.152 dtucker 1299: va_list ap;
1.150 dtucker 1300:
1.152 dtucker 1301: va_start(ap, string);
1302: ret = vdollar_percent_expand(&err, 1, 0, string, ap);
1303: va_end(ap);
1.150 dtucker 1304: if (parseerr != NULL)
1305: *parseerr = err;
1306: return ret;
1307: }
1308:
1309: /*
1310: * Returns expanded string or NULL if a specified environment variable is
1311: * not defined, or calls fatal if the string is invalid.
1312: */
1313: char *
1314: percent_expand(const char *string, ...)
1315: {
1316: char *ret;
1317: int err;
1318: va_list ap;
1319:
1320: va_start(ap, string);
1321: ret = vdollar_percent_expand(&err, 0, 1, string, ap);
1322: va_end(ap);
1323: if (err)
1.155 djm 1324: fatal_f("failed");
1.150 dtucker 1325: return ret;
1326: }
1327:
1328: /*
1329: * Returns expanded string or NULL if a specified environment variable is
1330: * not defined, or calls fatal if the string is invalid.
1331: */
1332: char *
1333: percent_dollar_expand(const char *string, ...)
1334: {
1335: char *ret;
1336: int err;
1337: va_list ap;
1338:
1339: va_start(ap, string);
1340: ret = vdollar_percent_expand(&err, 1, 1, string, ap);
1341: va_end(ap);
1342: if (err)
1.155 djm 1343: fatal_f("failed");
1.140 djm 1344: return ret;
1.36 reyk 1345: }
1346:
1347: int
1.115 djm 1348: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1349: {
1.37 reyk 1350: struct ifreq ifr;
1.36 reyk 1351: char name[100];
1.37 reyk 1352: int fd = -1, sock;
1.99 sthen 1353: const char *tunbase = "tun";
1354:
1.115 djm 1355: if (ifname != NULL)
1356: *ifname = NULL;
1357:
1.99 sthen 1358: if (mode == SSH_TUNMODE_ETHERNET)
1359: tunbase = "tap";
1.36 reyk 1360:
1.37 reyk 1361: /* Open the tunnel device */
1362: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1363: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1364: fd = open(name, O_RDWR);
1365: } else if (tun == SSH_TUNID_ANY) {
1366: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1367: snprintf(name, sizeof(name), "/dev/%s%d",
1368: tunbase, tun);
1.37 reyk 1369: if ((fd = open(name, O_RDWR)) >= 0)
1370: break;
1.36 reyk 1371: }
1372: } else {
1.155 djm 1373: debug_f("invalid tunnel %u", tun);
1.98 djm 1374: return -1;
1.37 reyk 1375: }
1376:
1.139 deraadt 1377: if (fd == -1) {
1.155 djm 1378: debug_f("%s open: %s", name, strerror(errno));
1.98 djm 1379: return -1;
1.36 reyk 1380: }
1.37 reyk 1381:
1.155 djm 1382: debug_f("%s mode %d fd %d", name, mode, fd);
1.37 reyk 1383:
1.99 sthen 1384: /* Bring interface up if it is not already */
1385: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1386: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1387: goto failed;
1388:
1.98 djm 1389: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1.155 djm 1390: debug_f("get interface %s flags: %s", ifr.ifr_name,
1391: strerror(errno));
1.37 reyk 1392: goto failed;
1.98 djm 1393: }
1.40 reyk 1394:
1.98 djm 1395: if (!(ifr.ifr_flags & IFF_UP)) {
1396: ifr.ifr_flags |= IFF_UP;
1397: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1.155 djm 1398: debug_f("activate interface %s: %s", ifr.ifr_name,
1399: strerror(errno));
1.98 djm 1400: goto failed;
1401: }
1402: }
1.115 djm 1403:
1404: if (ifname != NULL)
1405: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1406:
1407: close(sock);
1.98 djm 1408: return fd;
1.37 reyk 1409:
1410: failed:
1411: if (fd >= 0)
1412: close(fd);
1413: if (sock >= 0)
1414: close(sock);
1.98 djm 1415: return -1;
1.35 djm 1416: }
1417:
1418: void
1419: sanitise_stdfd(void)
1420: {
1.41 djm 1421: int nullfd, dupfd;
1.35 djm 1422:
1.41 djm 1423: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1424: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1425: strerror(errno));
1.35 djm 1426: exit(1);
1427: }
1.103 krw 1428: while (++dupfd <= STDERR_FILENO) {
1429: /* Only populate closed fds. */
1430: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1431: if (dup2(nullfd, dupfd) == -1) {
1432: fprintf(stderr, "dup2: %s\n", strerror(errno));
1433: exit(1);
1434: }
1.35 djm 1435: }
1436: }
1.103 krw 1437: if (nullfd > STDERR_FILENO)
1.35 djm 1438: close(nullfd);
1.1 markus 1439: }
1.33 djm 1440:
1441: char *
1.52 djm 1442: tohex(const void *vp, size_t l)
1.33 djm 1443: {
1.52 djm 1444: const u_char *p = (const u_char *)vp;
1.33 djm 1445: char b[3], *r;
1.52 djm 1446: size_t i, hl;
1447:
1448: if (l > 65536)
1449: return xstrdup("tohex: length > 65536");
1.33 djm 1450:
1451: hl = l * 2 + 1;
1.49 djm 1452: r = xcalloc(1, hl);
1.33 djm 1453: for (i = 0; i < l; i++) {
1.52 djm 1454: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1455: strlcat(r, b, hl);
1456: }
1457: return (r);
1458: }
1.145 djm 1459:
1460: /*
1461: * Extend string *sp by the specified format. If *sp is not NULL (or empty),
1462: * then the separator 'sep' will be prepended before the formatted arguments.
1463: * Extended strings are heap allocated.
1464: */
1465: void
1466: xextendf(char **sp, const char *sep, const char *fmt, ...)
1467: {
1468: va_list ap;
1469: char *tmp1, *tmp2;
1470:
1471: va_start(ap, fmt);
1472: xvasprintf(&tmp1, fmt, ap);
1473: va_end(ap);
1474:
1475: if (*sp == NULL || **sp == '\0') {
1476: free(*sp);
1477: *sp = tmp1;
1478: return;
1479: }
1480: xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1);
1481: free(tmp1);
1482: free(*sp);
1483: *sp = tmp2;
1484: }
1485:
1.33 djm 1486:
1.52 djm 1487: u_int64_t
1488: get_u64(const void *vp)
1489: {
1490: const u_char *p = (const u_char *)vp;
1491: u_int64_t v;
1492:
1493: v = (u_int64_t)p[0] << 56;
1494: v |= (u_int64_t)p[1] << 48;
1495: v |= (u_int64_t)p[2] << 40;
1496: v |= (u_int64_t)p[3] << 32;
1497: v |= (u_int64_t)p[4] << 24;
1498: v |= (u_int64_t)p[5] << 16;
1499: v |= (u_int64_t)p[6] << 8;
1500: v |= (u_int64_t)p[7];
1501:
1502: return (v);
1503: }
1504:
1505: u_int32_t
1506: get_u32(const void *vp)
1507: {
1508: const u_char *p = (const u_char *)vp;
1509: u_int32_t v;
1510:
1511: v = (u_int32_t)p[0] << 24;
1512: v |= (u_int32_t)p[1] << 16;
1513: v |= (u_int32_t)p[2] << 8;
1514: v |= (u_int32_t)p[3];
1515:
1516: return (v);
1517: }
1518:
1.93 djm 1519: u_int32_t
1520: get_u32_le(const void *vp)
1521: {
1522: const u_char *p = (const u_char *)vp;
1523: u_int32_t v;
1524:
1525: v = (u_int32_t)p[0];
1526: v |= (u_int32_t)p[1] << 8;
1527: v |= (u_int32_t)p[2] << 16;
1528: v |= (u_int32_t)p[3] << 24;
1529:
1530: return (v);
1531: }
1532:
1.52 djm 1533: u_int16_t
1534: get_u16(const void *vp)
1535: {
1536: const u_char *p = (const u_char *)vp;
1537: u_int16_t v;
1538:
1539: v = (u_int16_t)p[0] << 8;
1540: v |= (u_int16_t)p[1];
1541:
1542: return (v);
1543: }
1544:
1545: void
1546: put_u64(void *vp, u_int64_t v)
1547: {
1548: u_char *p = (u_char *)vp;
1549:
1550: p[0] = (u_char)(v >> 56) & 0xff;
1551: p[1] = (u_char)(v >> 48) & 0xff;
1552: p[2] = (u_char)(v >> 40) & 0xff;
1553: p[3] = (u_char)(v >> 32) & 0xff;
1554: p[4] = (u_char)(v >> 24) & 0xff;
1555: p[5] = (u_char)(v >> 16) & 0xff;
1556: p[6] = (u_char)(v >> 8) & 0xff;
1557: p[7] = (u_char)v & 0xff;
1558: }
1559:
1560: void
1561: put_u32(void *vp, u_int32_t v)
1562: {
1563: u_char *p = (u_char *)vp;
1564:
1565: p[0] = (u_char)(v >> 24) & 0xff;
1566: p[1] = (u_char)(v >> 16) & 0xff;
1567: p[2] = (u_char)(v >> 8) & 0xff;
1568: p[3] = (u_char)v & 0xff;
1569: }
1570:
1.93 djm 1571: void
1572: put_u32_le(void *vp, u_int32_t v)
1573: {
1574: u_char *p = (u_char *)vp;
1575:
1576: p[0] = (u_char)v & 0xff;
1577: p[1] = (u_char)(v >> 8) & 0xff;
1578: p[2] = (u_char)(v >> 16) & 0xff;
1579: p[3] = (u_char)(v >> 24) & 0xff;
1580: }
1.52 djm 1581:
1582: void
1583: put_u16(void *vp, u_int16_t v)
1584: {
1585: u_char *p = (u_char *)vp;
1586:
1587: p[0] = (u_char)(v >> 8) & 0xff;
1588: p[1] = (u_char)v & 0xff;
1589: }
1.68 dtucker 1590:
1591: void
1592: ms_subtract_diff(struct timeval *start, int *ms)
1593: {
1594: struct timeval diff, finish;
1595:
1.119 dtucker 1596: monotime_tv(&finish);
1597: timersub(&finish, start, &diff);
1.68 dtucker 1598: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1599: }
1600:
1601: void
1.171 deraadt 1602: ms_to_timespec(struct timespec *ts, int ms)
1.68 dtucker 1603: {
1604: if (ms < 0)
1605: ms = 0;
1.171 deraadt 1606: ts->tv_sec = ms / 1000;
1607: ts->tv_nsec = (ms % 1000) * 1000 * 1000;
1.90 dtucker 1608: }
1609:
1.119 dtucker 1610: void
1611: monotime_ts(struct timespec *ts)
1612: {
1613: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1614: fatal("clock_gettime: %s", strerror(errno));
1615: }
1616:
1617: void
1618: monotime_tv(struct timeval *tv)
1619: {
1620: struct timespec ts;
1621:
1622: monotime_ts(&ts);
1623: tv->tv_sec = ts.tv_sec;
1624: tv->tv_usec = ts.tv_nsec / 1000;
1625: }
1626:
1.90 dtucker 1627: time_t
1628: monotime(void)
1629: {
1630: struct timespec ts;
1631:
1.119 dtucker 1632: monotime_ts(&ts);
1.90 dtucker 1633: return (ts.tv_sec);
1.102 dtucker 1634: }
1635:
1636: double
1637: monotime_double(void)
1638: {
1639: struct timespec ts;
1640:
1.119 dtucker 1641: monotime_ts(&ts);
1642: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1643: }
1644:
1645: void
1646: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1647: {
1648: bw->buflen = buflen;
1649: bw->rate = kbps;
1.135 dtucker 1650: bw->thresh = buflen;
1.81 djm 1651: bw->lamt = 0;
1652: timerclear(&bw->bwstart);
1653: timerclear(&bw->bwend);
1.135 dtucker 1654: }
1.81 djm 1655:
1656: /* Callback from read/write loop to insert bandwidth-limiting delays */
1657: void
1658: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1659: {
1660: u_int64_t waitlen;
1661: struct timespec ts, rm;
1662:
1.135 dtucker 1663: bw->lamt += read_len;
1.81 djm 1664: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1665: monotime_tv(&bw->bwstart);
1.81 djm 1666: return;
1667: }
1668: if (bw->lamt < bw->thresh)
1669: return;
1670:
1.119 dtucker 1671: monotime_tv(&bw->bwend);
1.81 djm 1672: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1673: if (!timerisset(&bw->bwend))
1674: return;
1675:
1676: bw->lamt *= 8;
1677: waitlen = (double)1000000L * bw->lamt / bw->rate;
1678:
1679: bw->bwstart.tv_sec = waitlen / 1000000L;
1680: bw->bwstart.tv_usec = waitlen % 1000000L;
1681:
1682: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1683: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1684:
1685: /* Adjust the wait time */
1686: if (bw->bwend.tv_sec) {
1687: bw->thresh /= 2;
1688: if (bw->thresh < bw->buflen / 4)
1689: bw->thresh = bw->buflen / 4;
1690: } else if (bw->bwend.tv_usec < 10000) {
1691: bw->thresh *= 2;
1692: if (bw->thresh > bw->buflen * 8)
1693: bw->thresh = bw->buflen * 8;
1694: }
1695:
1696: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1697: while (nanosleep(&ts, &rm) == -1) {
1698: if (errno != EINTR)
1699: break;
1700: ts = rm;
1701: }
1702: }
1703:
1704: bw->lamt = 0;
1.119 dtucker 1705: monotime_tv(&bw->bwstart);
1.84 djm 1706: }
1707:
1708: /* Make a template filename for mk[sd]temp() */
1709: void
1710: mktemp_proto(char *s, size_t len)
1711: {
1712: const char *tmpdir;
1713: int r;
1714:
1715: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1716: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1717: if (r > 0 && (size_t)r < len)
1718: return;
1719: }
1720: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1721: if (r < 0 || (size_t)r >= len)
1.155 djm 1722: fatal_f("template string too short");
1.68 dtucker 1723: }
1.83 djm 1724:
1725: static const struct {
1726: const char *name;
1727: int value;
1728: } ipqos[] = {
1.111 djm 1729: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1730: { "af11", IPTOS_DSCP_AF11 },
1731: { "af12", IPTOS_DSCP_AF12 },
1732: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1733: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1734: { "af22", IPTOS_DSCP_AF22 },
1735: { "af23", IPTOS_DSCP_AF23 },
1736: { "af31", IPTOS_DSCP_AF31 },
1737: { "af32", IPTOS_DSCP_AF32 },
1738: { "af33", IPTOS_DSCP_AF33 },
1739: { "af41", IPTOS_DSCP_AF41 },
1740: { "af42", IPTOS_DSCP_AF42 },
1741: { "af43", IPTOS_DSCP_AF43 },
1742: { "cs0", IPTOS_DSCP_CS0 },
1743: { "cs1", IPTOS_DSCP_CS1 },
1744: { "cs2", IPTOS_DSCP_CS2 },
1745: { "cs3", IPTOS_DSCP_CS3 },
1746: { "cs4", IPTOS_DSCP_CS4 },
1747: { "cs5", IPTOS_DSCP_CS5 },
1748: { "cs6", IPTOS_DSCP_CS6 },
1749: { "cs7", IPTOS_DSCP_CS7 },
1750: { "ef", IPTOS_DSCP_EF },
1.146 djm 1751: { "le", IPTOS_DSCP_LE },
1.83 djm 1752: { "lowdelay", IPTOS_LOWDELAY },
1753: { "throughput", IPTOS_THROUGHPUT },
1754: { "reliability", IPTOS_RELIABILITY },
1755: { NULL, -1 }
1756: };
1757:
1758: int
1759: parse_ipqos(const char *cp)
1760: {
1761: u_int i;
1762: char *ep;
1763: long val;
1764:
1765: if (cp == NULL)
1766: return -1;
1767: for (i = 0; ipqos[i].name != NULL; i++) {
1768: if (strcasecmp(cp, ipqos[i].name) == 0)
1769: return ipqos[i].value;
1770: }
1771: /* Try parsing as an integer */
1772: val = strtol(cp, &ep, 0);
1773: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1774: return -1;
1775: return val;
1776: }
1777:
1.85 stevesk 1778: const char *
1779: iptos2str(int iptos)
1780: {
1781: int i;
1782: static char iptos_str[sizeof "0xff"];
1783:
1784: for (i = 0; ipqos[i].name != NULL; i++) {
1785: if (ipqos[i].value == iptos)
1786: return ipqos[i].name;
1787: }
1788: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1789: return iptos_str;
1.92 djm 1790: }
1791:
1792: void
1793: lowercase(char *s)
1794: {
1795: for (; *s; s++)
1796: *s = tolower((u_char)*s);
1.94 millert 1797: }
1798:
1799: int
1800: unix_listener(const char *path, int backlog, int unlink_first)
1801: {
1802: struct sockaddr_un sunaddr;
1803: int saved_errno, sock;
1804:
1805: memset(&sunaddr, 0, sizeof(sunaddr));
1806: sunaddr.sun_family = AF_UNIX;
1.121 djm 1807: if (strlcpy(sunaddr.sun_path, path,
1808: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1.155 djm 1809: error_f("path \"%s\" too long for Unix domain socket", path);
1.94 millert 1810: errno = ENAMETOOLONG;
1811: return -1;
1812: }
1813:
1814: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1.139 deraadt 1815: if (sock == -1) {
1.94 millert 1816: saved_errno = errno;
1.155 djm 1817: error_f("socket: %.100s", strerror(errno));
1.94 millert 1818: errno = saved_errno;
1819: return -1;
1820: }
1821: if (unlink_first == 1) {
1822: if (unlink(path) != 0 && errno != ENOENT)
1823: error("unlink(%s): %.100s", path, strerror(errno));
1824: }
1.139 deraadt 1825: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 millert 1826: saved_errno = errno;
1.155 djm 1827: error_f("cannot bind to path %s: %s", path, strerror(errno));
1.122 djm 1828: close(sock);
1.94 millert 1829: errno = saved_errno;
1830: return -1;
1831: }
1.139 deraadt 1832: if (listen(sock, backlog) == -1) {
1.94 millert 1833: saved_errno = errno;
1.155 djm 1834: error_f("cannot listen on path %s: %s", path, strerror(errno));
1.94 millert 1835: close(sock);
1836: unlink(path);
1837: errno = saved_errno;
1838: return -1;
1839: }
1840: return sock;
1.85 stevesk 1841: }
1.104 djm 1842:
1843: /*
1844: * Compares two strings that maybe be NULL. Returns non-zero if strings
1845: * are both NULL or are identical, returns zero otherwise.
1846: */
1847: static int
1848: strcmp_maybe_null(const char *a, const char *b)
1849: {
1850: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1851: return 0;
1852: if (a != NULL && strcmp(a, b) != 0)
1853: return 0;
1854: return 1;
1855: }
1856:
1857: /*
1858: * Compare two forwards, returning non-zero if they are identical or
1859: * zero otherwise.
1860: */
1861: int
1862: forward_equals(const struct Forward *a, const struct Forward *b)
1863: {
1864: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1865: return 0;
1866: if (a->listen_port != b->listen_port)
1867: return 0;
1868: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1869: return 0;
1870: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1871: return 0;
1872: if (a->connect_port != b->connect_port)
1873: return 0;
1874: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1875: return 0;
1876: /* allocated_port and handle are not checked */
1.107 dtucker 1877: return 1;
1878: }
1879:
1880: /* returns 1 if process is already daemonized, 0 otherwise */
1881: int
1882: daemonized(void)
1883: {
1884: int fd;
1885:
1886: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1887: close(fd);
1888: return 0; /* have controlling terminal */
1889: }
1890: if (getppid() != 1)
1891: return 0; /* parent is not init */
1892: if (getsid(0) != getpid())
1893: return 0; /* not session leader */
1894: debug3("already daemonized");
1.106 dtucker 1895: return 1;
1896: }
1.112 djm 1897:
1898: /*
1899: * Splits 's' into an argument vector. Handles quoted string and basic
1900: * escape characters (\\, \", \'). Caller must free the argument vector
1901: * and its members.
1902: */
1903: int
1.166 djm 1904: argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment)
1.112 djm 1905: {
1906: int r = SSH_ERR_INTERNAL_ERROR;
1907: int argc = 0, quote, i, j;
1908: char *arg, **argv = xcalloc(1, sizeof(*argv));
1909:
1910: *argvp = NULL;
1911: *argcp = 0;
1912:
1913: for (i = 0; s[i] != '\0'; i++) {
1914: /* Skip leading whitespace */
1915: if (s[i] == ' ' || s[i] == '\t')
1916: continue;
1.166 djm 1917: if (terminate_on_comment && s[i] == '#')
1918: break;
1.112 djm 1919: /* Start of a token */
1920: quote = 0;
1921:
1922: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1923: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1924: argv[argc] = NULL;
1925:
1926: /* Copy the token in, removing escapes */
1927: for (j = 0; s[i] != '\0'; i++) {
1928: if (s[i] == '\\') {
1929: if (s[i + 1] == '\'' ||
1930: s[i + 1] == '\"' ||
1.166 djm 1931: s[i + 1] == '\\' ||
1932: (quote == 0 && s[i + 1] == ' ')) {
1.112 djm 1933: i++; /* Skip '\' */
1934: arg[j++] = s[i];
1935: } else {
1936: /* Unrecognised escape */
1937: arg[j++] = s[i];
1938: }
1939: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1940: break; /* done */
1.163 djm 1941: else if (quote == 0 && (s[i] == '\"' || s[i] == '\''))
1942: quote = s[i]; /* quote start */
1.112 djm 1943: else if (quote != 0 && s[i] == quote)
1.163 djm 1944: quote = 0; /* quote end */
1.112 djm 1945: else
1946: arg[j++] = s[i];
1947: }
1948: if (s[i] == '\0') {
1949: if (quote != 0) {
1950: /* Ran out of string looking for close quote */
1951: r = SSH_ERR_INVALID_FORMAT;
1952: goto out;
1953: }
1954: break;
1955: }
1956: }
1957: /* Success */
1958: *argcp = argc;
1959: *argvp = argv;
1960: argc = 0;
1961: argv = NULL;
1962: r = 0;
1963: out:
1964: if (argc != 0 && argv != NULL) {
1965: for (i = 0; i < argc; i++)
1966: free(argv[i]);
1967: free(argv);
1968: }
1969: return r;
1970: }
1971:
1972: /*
1973: * Reassemble an argument vector into a string, quoting and escaping as
1974: * necessary. Caller must free returned string.
1975: */
1976: char *
1977: argv_assemble(int argc, char **argv)
1978: {
1979: int i, j, ws, r;
1980: char c, *ret;
1981: struct sshbuf *buf, *arg;
1982:
1983: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1.155 djm 1984: fatal_f("sshbuf_new failed");
1.112 djm 1985:
1986: for (i = 0; i < argc; i++) {
1987: ws = 0;
1988: sshbuf_reset(arg);
1989: for (j = 0; argv[i][j] != '\0'; j++) {
1990: r = 0;
1991: c = argv[i][j];
1992: switch (c) {
1993: case ' ':
1994: case '\t':
1995: ws = 1;
1996: r = sshbuf_put_u8(arg, c);
1997: break;
1998: case '\\':
1999: case '\'':
2000: case '"':
2001: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
2002: break;
2003: /* FALLTHROUGH */
2004: default:
2005: r = sshbuf_put_u8(arg, c);
2006: break;
2007: }
2008: if (r != 0)
1.155 djm 2009: fatal_fr(r, "sshbuf_put_u8");
1.112 djm 2010: }
2011: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
2012: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
2013: (r = sshbuf_putb(buf, arg)) != 0 ||
2014: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1.155 djm 2015: fatal_fr(r, "assemble");
1.112 djm 2016: }
2017: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1.155 djm 2018: fatal_f("malloc failed");
1.112 djm 2019: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
2020: ret[sshbuf_len(buf)] = '\0';
2021: sshbuf_free(buf);
2022: sshbuf_free(arg);
2023: return ret;
1.166 djm 2024: }
2025:
2026: char *
2027: argv_next(int *argcp, char ***argvp)
2028: {
2029: char *ret = (*argvp)[0];
2030:
2031: if (*argcp > 0 && ret != NULL) {
2032: (*argcp)--;
2033: (*argvp)++;
2034: }
2035: return ret;
2036: }
2037:
2038: void
2039: argv_consume(int *argcp)
2040: {
2041: *argcp = 0;
2042: }
2043:
2044: void
2045: argv_free(char **av, int ac)
2046: {
2047: int i;
2048:
2049: if (av == NULL)
2050: return;
2051: for (i = 0; i < ac; i++)
2052: free(av[i]);
2053: free(av);
1.112 djm 2054: }
2055:
2056: /* Returns 0 if pid exited cleanly, non-zero otherwise */
2057: int
1.113 djm 2058: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 2059: {
2060: int status;
2061:
2062: while (waitpid(pid, &status, 0) == -1) {
2063: if (errno != EINTR) {
1.155 djm 2064: error("%s waitpid: %s", tag, strerror(errno));
1.112 djm 2065: return -1;
2066: }
2067: }
2068: if (WIFSIGNALED(status)) {
2069: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
2070: return -1;
2071: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 2072: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
2073: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 2074: return -1;
2075: }
2076: return 0;
2077: }
2078:
2079: /*
2080: * Check a given path for security. This is defined as all components
2081: * of the path to the file must be owned by either the owner of
2082: * of the file or root and no directories must be group or world writable.
2083: *
2084: * XXX Should any specific check be done for sym links ?
2085: *
2086: * Takes a file name, its stat information (preferably from fstat() to
2087: * avoid races), the uid of the expected owner, their home directory and an
2088: * error buffer plus max size as arguments.
2089: *
2090: * Returns 0 on success and -1 on failure
2091: */
2092: int
2093: safe_path(const char *name, struct stat *stp, const char *pw_dir,
2094: uid_t uid, char *err, size_t errlen)
2095: {
2096: char buf[PATH_MAX], homedir[PATH_MAX];
2097: char *cp;
2098: int comparehome = 0;
2099: struct stat st;
2100:
2101: if (realpath(name, buf) == NULL) {
2102: snprintf(err, errlen, "realpath %s failed: %s", name,
2103: strerror(errno));
2104: return -1;
2105: }
2106: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
2107: comparehome = 1;
2108:
2109: if (!S_ISREG(stp->st_mode)) {
2110: snprintf(err, errlen, "%s is not a regular file", buf);
2111: return -1;
2112: }
2113: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
2114: (stp->st_mode & 022) != 0) {
2115: snprintf(err, errlen, "bad ownership or modes for file %s",
2116: buf);
2117: return -1;
2118: }
2119:
2120: /* for each component of the canonical path, walking upwards */
2121: for (;;) {
2122: if ((cp = dirname(buf)) == NULL) {
2123: snprintf(err, errlen, "dirname() failed");
2124: return -1;
2125: }
2126: strlcpy(buf, cp, sizeof(buf));
2127:
1.139 deraadt 2128: if (stat(buf, &st) == -1 ||
1.112 djm 2129: (st.st_uid != 0 && st.st_uid != uid) ||
2130: (st.st_mode & 022) != 0) {
2131: snprintf(err, errlen,
2132: "bad ownership or modes for directory %s", buf);
2133: return -1;
2134: }
2135:
2136: /* If are past the homedir then we can stop */
2137: if (comparehome && strcmp(homedir, buf) == 0)
2138: break;
2139:
2140: /*
2141: * dirname should always complete with a "/" path,
2142: * but we can be paranoid and check for "." too
2143: */
2144: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
2145: break;
2146: }
2147: return 0;
2148: }
2149:
2150: /*
2151: * Version of safe_path() that accepts an open file descriptor to
2152: * avoid races.
2153: *
2154: * Returns 0 on success and -1 on failure
2155: */
2156: int
2157: safe_path_fd(int fd, const char *file, struct passwd *pw,
2158: char *err, size_t errlen)
2159: {
2160: struct stat st;
2161:
2162: /* check the open file to avoid races */
1.139 deraadt 2163: if (fstat(fd, &st) == -1) {
1.112 djm 2164: snprintf(err, errlen, "cannot stat file %s: %s",
2165: file, strerror(errno));
2166: return -1;
2167: }
2168: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
2169: }
2170:
2171: /*
2172: * Sets the value of the given variable in the environment. If the variable
2173: * already exists, its value is overridden.
2174: */
2175: void
2176: child_set_env(char ***envp, u_int *envsizep, const char *name,
2177: const char *value)
2178: {
2179: char **env;
2180: u_int envsize;
2181: u_int i, namelen;
2182:
2183: if (strchr(name, '=') != NULL) {
2184: error("Invalid environment variable \"%.100s\"", name);
2185: return;
2186: }
2187:
2188: /*
2189: * Find the slot where the value should be stored. If the variable
2190: * already exists, we reuse the slot; otherwise we append a new slot
2191: * at the end of the array, expanding if necessary.
2192: */
2193: env = *envp;
2194: namelen = strlen(name);
2195: for (i = 0; env[i]; i++)
2196: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
2197: break;
2198: if (env[i]) {
2199: /* Reuse the slot. */
2200: free(env[i]);
2201: } else {
2202: /* New variable. Expand if necessary. */
2203: envsize = *envsizep;
2204: if (i >= envsize - 1) {
2205: if (envsize >= 1000)
2206: fatal("child_set_env: too many env vars");
2207: envsize += 50;
2208: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
2209: *envsizep = envsize;
2210: }
2211: /* Need to set the NULL pointer at end of array beyond the new slot. */
2212: env[i + 1] = NULL;
2213: }
2214:
2215: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 2216: /* XXX xasprintf */
1.112 djm 2217: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
2218: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
2219: }
2220:
1.114 millert 2221: /*
2222: * Check and optionally lowercase a domain name, also removes trailing '.'
2223: * Returns 1 on success and 0 on failure, storing an error message in errstr.
2224: */
2225: int
2226: valid_domain(char *name, int makelower, const char **errstr)
2227: {
2228: size_t i, l = strlen(name);
2229: u_char c, last = '\0';
2230: static char errbuf[256];
2231:
2232: if (l == 0) {
2233: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
2234: goto bad;
2235: }
2236: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
2237: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
2238: "starts with invalid character", name);
2239: goto bad;
2240: }
2241: for (i = 0; i < l; i++) {
2242: c = tolower((u_char)name[i]);
2243: if (makelower)
2244: name[i] = (char)c;
2245: if (last == '.' && c == '.') {
2246: snprintf(errbuf, sizeof(errbuf), "domain name "
2247: "\"%.100s\" contains consecutive separators", name);
2248: goto bad;
2249: }
2250: if (c != '.' && c != '-' && !isalnum(c) &&
2251: c != '_') /* technically invalid, but common */ {
2252: snprintf(errbuf, sizeof(errbuf), "domain name "
2253: "\"%.100s\" contains invalid characters", name);
2254: goto bad;
2255: }
2256: last = c;
2257: }
2258: if (name[l - 1] == '.')
2259: name[l - 1] = '\0';
2260: if (errstr != NULL)
2261: *errstr = NULL;
2262: return 1;
2263: bad:
2264: if (errstr != NULL)
2265: *errstr = errbuf;
2266: return 0;
1.132 djm 2267: }
2268:
2269: /*
2270: * Verify that a environment variable name (not including initial '$') is
2271: * valid; consisting of one or more alphanumeric or underscore characters only.
2272: * Returns 1 on valid, 0 otherwise.
2273: */
2274: int
2275: valid_env_name(const char *name)
2276: {
2277: const char *cp;
2278:
2279: if (name[0] == '\0')
2280: return 0;
2281: for (cp = name; *cp != '\0'; cp++) {
2282: if (!isalnum((u_char)*cp) && *cp != '_')
2283: return 0;
2284: }
2285: return 1;
1.120 dtucker 2286: }
2287:
2288: const char *
2289: atoi_err(const char *nptr, int *val)
2290: {
2291: const char *errstr = NULL;
2292: long long num;
2293:
2294: if (nptr == NULL || *nptr == '\0')
2295: return "missing";
2296: num = strtonum(nptr, 0, INT_MAX, &errstr);
2297: if (errstr == NULL)
2298: *val = (int)num;
2299: return errstr;
1.127 djm 2300: }
2301:
2302: int
2303: parse_absolute_time(const char *s, uint64_t *tp)
2304: {
2305: struct tm tm;
2306: time_t tt;
2307: char buf[32], *fmt;
1.177 djm 2308: const char *cp;
2309: size_t l;
2310: int is_utc = 0;
1.127 djm 2311:
2312: *tp = 0;
2313:
1.177 djm 2314: l = strlen(s);
2315: if (l > 1 && strcasecmp(s + l - 1, "Z") == 0) {
2316: is_utc = 1;
2317: l--;
2318: } else if (l > 3 && strcasecmp(s + l - 3, "UTC") == 0) {
2319: is_utc = 1;
2320: l -= 3;
2321: }
1.127 djm 2322: /*
2323: * POSIX strptime says "The application shall ensure that there
2324: * is white-space or other non-alphanumeric characters between
2325: * any two conversion specifications" so arrange things this way.
2326: */
1.177 djm 2327: switch (l) {
1.127 djm 2328: case 8: /* YYYYMMDD */
2329: fmt = "%Y-%m-%d";
2330: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
2331: break;
2332: case 12: /* YYYYMMDDHHMM */
2333: fmt = "%Y-%m-%dT%H:%M";
2334: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
2335: s, s + 4, s + 6, s + 8, s + 10);
2336: break;
2337: case 14: /* YYYYMMDDHHMMSS */
2338: fmt = "%Y-%m-%dT%H:%M:%S";
2339: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
2340: s, s + 4, s + 6, s + 8, s + 10, s + 12);
2341: break;
2342: default:
2343: return SSH_ERR_INVALID_FORMAT;
2344: }
2345:
2346: memset(&tm, 0, sizeof(tm));
1.177 djm 2347: if ((cp = strptime(buf, fmt, &tm)) == NULL || *cp != '\0')
1.127 djm 2348: return SSH_ERR_INVALID_FORMAT;
1.177 djm 2349: if (is_utc) {
2350: if ((tt = timegm(&tm)) < 0)
2351: return SSH_ERR_INVALID_FORMAT;
2352: } else {
2353: if ((tt = mktime(&tm)) < 0)
2354: return SSH_ERR_INVALID_FORMAT;
2355: }
1.127 djm 2356: /* success */
2357: *tp = (uint64_t)tt;
2358: return 0;
2359: }
1.167 dtucker 2360:
1.127 djm 2361: void
2362: format_absolute_time(uint64_t t, char *buf, size_t len)
2363: {
1.167 dtucker 2364: time_t tt = t > SSH_TIME_T_MAX ? SSH_TIME_T_MAX : t;
1.127 djm 2365: struct tm tm;
2366:
2367: localtime_r(&tt, &tm);
2368: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.134 djm 2369: }
2370:
2371: /* check if path is absolute */
2372: int
2373: path_absolute(const char *path)
2374: {
2375: return (*path == '/') ? 1 : 0;
1.141 djm 2376: }
2377:
2378: void
2379: skip_space(char **cpp)
2380: {
2381: char *cp;
2382:
2383: for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
2384: ;
2385: *cpp = cp;
1.114 millert 2386: }
1.142 djm 2387:
2388: /* authorized_key-style options parsing helpers */
2389:
2390: /*
2391: * Match flag 'opt' in *optsp, and if allow_negate is set then also match
2392: * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
2393: * if negated option matches.
2394: * If the option or negated option matches, then *optsp is updated to
2395: * point to the first character after the option.
2396: */
2397: int
2398: opt_flag(const char *opt, int allow_negate, const char **optsp)
2399: {
2400: size_t opt_len = strlen(opt);
2401: const char *opts = *optsp;
2402: int negate = 0;
2403:
2404: if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
2405: opts += 3;
2406: negate = 1;
2407: }
2408: if (strncasecmp(opts, opt, opt_len) == 0) {
2409: *optsp = opts + opt_len;
2410: return negate ? 0 : 1;
2411: }
2412: return -1;
2413: }
2414:
2415: char *
2416: opt_dequote(const char **sp, const char **errstrp)
2417: {
2418: const char *s = *sp;
2419: char *ret;
2420: size_t i;
2421:
2422: *errstrp = NULL;
2423: if (*s != '"') {
2424: *errstrp = "missing start quote";
2425: return NULL;
2426: }
2427: s++;
2428: if ((ret = malloc(strlen((s)) + 1)) == NULL) {
2429: *errstrp = "memory allocation failed";
2430: return NULL;
2431: }
2432: for (i = 0; *s != '\0' && *s != '"';) {
2433: if (s[0] == '\\' && s[1] == '"')
2434: s++;
2435: ret[i++] = *s++;
2436: }
2437: if (*s == '\0') {
2438: *errstrp = "missing end quote";
2439: free(ret);
2440: return NULL;
2441: }
2442: ret[i] = '\0';
2443: s++;
2444: *sp = s;
2445: return ret;
2446: }
2447:
2448: int
2449: opt_match(const char **opts, const char *term)
2450: {
2451: if (strncasecmp((*opts), term, strlen(term)) == 0 &&
2452: (*opts)[strlen(term)] == '=') {
2453: *opts += strlen(term) + 1;
2454: return 1;
2455: }
2456: return 0;
1.161 markus 2457: }
2458:
2459: void
2460: opt_array_append2(const char *file, const int line, const char *directive,
2461: char ***array, int **iarray, u_int *lp, const char *s, int i)
2462: {
2463:
2464: if (*lp >= INT_MAX)
2465: fatal("%s line %d: Too many %s entries", file, line, directive);
2466:
2467: if (iarray != NULL) {
2468: *iarray = xrecallocarray(*iarray, *lp, *lp + 1,
2469: sizeof(**iarray));
2470: (*iarray)[*lp] = i;
2471: }
2472:
2473: *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array));
2474: (*array)[*lp] = xstrdup(s);
2475: (*lp)++;
2476: }
2477:
2478: void
2479: opt_array_append(const char *file, const int line, const char *directive,
2480: char ***array, u_int *lp, const char *s)
2481: {
2482: opt_array_append2(file, line, directive, array, NULL, lp, s, 0);
1.142 djm 2483: }
2484:
1.144 dtucker 2485: sshsig_t
2486: ssh_signal(int signum, sshsig_t handler)
2487: {
2488: struct sigaction sa, osa;
2489:
2490: /* mask all other signals while in handler */
1.147 dtucker 2491: memset(&sa, 0, sizeof(sa));
1.144 dtucker 2492: sa.sa_handler = handler;
2493: sigfillset(&sa.sa_mask);
2494: if (signum != SIGALRM)
2495: sa.sa_flags = SA_RESTART;
2496: if (sigaction(signum, &sa, &osa) == -1) {
2497: debug3("sigaction(%s): %s", strsignal(signum), strerror(errno));
2498: return SIG_ERR;
2499: }
2500: return osa.sa_handler;
1.154 djm 2501: }
2502:
2503: int
2504: stdfd_devnull(int do_stdin, int do_stdout, int do_stderr)
2505: {
2506: int devnull, ret = 0;
2507:
2508: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.155 djm 2509: error_f("open %s: %s", _PATH_DEVNULL,
1.154 djm 2510: strerror(errno));
2511: return -1;
2512: }
2513: if ((do_stdin && dup2(devnull, STDIN_FILENO) == -1) ||
2514: (do_stdout && dup2(devnull, STDOUT_FILENO) == -1) ||
2515: (do_stderr && dup2(devnull, STDERR_FILENO) == -1)) {
1.155 djm 2516: error_f("dup2: %s", strerror(errno));
1.154 djm 2517: ret = -1;
2518: }
2519: if (devnull > STDERR_FILENO)
2520: close(devnull);
2521: return ret;
1.157 djm 2522: }
2523:
2524: /*
2525: * Runs command in a subprocess with a minimal environment.
2526: * Returns pid on success, 0 on failure.
2527: * The child stdout and stderr maybe captured, left attached or sent to
2528: * /dev/null depending on the contents of flags.
2529: * "tag" is prepended to log messages.
2530: * NB. "command" is only used for logging; the actual command executed is
2531: * av[0].
2532: */
2533: pid_t
2534: subprocess(const char *tag, const char *command,
2535: int ac, char **av, FILE **child, u_int flags,
2536: struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs)
2537: {
2538: FILE *f = NULL;
2539: struct stat st;
2540: int fd, devnull, p[2], i;
2541: pid_t pid;
2542: char *cp, errmsg[512];
2543: u_int nenv = 0;
2544: char **env = NULL;
2545:
2546: /* If dropping privs, then must specify user and restore function */
2547: if (drop_privs != NULL && (pw == NULL || restore_privs == NULL)) {
2548: error("%s: inconsistent arguments", tag); /* XXX fatal? */
2549: return 0;
2550: }
2551: if (pw == NULL && (pw = getpwuid(getuid())) == NULL) {
2552: error("%s: no user for current uid", tag);
2553: return 0;
2554: }
2555: if (child != NULL)
2556: *child = NULL;
2557:
2558: debug3_f("%s command \"%s\" running as %s (flags 0x%x)",
2559: tag, command, pw->pw_name, flags);
2560:
2561: /* Check consistency */
2562: if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
2563: (flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) {
2564: error_f("inconsistent flags");
2565: return 0;
2566: }
2567: if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) != (child == NULL)) {
2568: error_f("inconsistent flags/output");
2569: return 0;
2570: }
2571:
2572: /*
2573: * If executing an explicit binary, then verify the it exists
2574: * and appears safe-ish to execute
2575: */
2576: if (!path_absolute(av[0])) {
2577: error("%s path is not absolute", tag);
2578: return 0;
2579: }
2580: if (drop_privs != NULL)
2581: drop_privs(pw);
2582: if (stat(av[0], &st) == -1) {
2583: error("Could not stat %s \"%s\": %s", tag,
2584: av[0], strerror(errno));
2585: goto restore_return;
2586: }
2587: if ((flags & SSH_SUBPROCESS_UNSAFE_PATH) == 0 &&
2588: safe_path(av[0], &st, NULL, 0, errmsg, sizeof(errmsg)) != 0) {
2589: error("Unsafe %s \"%s\": %s", tag, av[0], errmsg);
2590: goto restore_return;
2591: }
2592: /* Prepare to keep the child's stdout if requested */
2593: if (pipe(p) == -1) {
2594: error("%s: pipe: %s", tag, strerror(errno));
2595: restore_return:
2596: if (restore_privs != NULL)
2597: restore_privs();
2598: return 0;
2599: }
2600: if (restore_privs != NULL)
2601: restore_privs();
2602:
2603: switch ((pid = fork())) {
2604: case -1: /* error */
2605: error("%s: fork: %s", tag, strerror(errno));
2606: close(p[0]);
2607: close(p[1]);
2608: return 0;
2609: case 0: /* child */
2610: /* Prepare a minimal environment for the child. */
2611: if ((flags & SSH_SUBPROCESS_PRESERVE_ENV) == 0) {
2612: nenv = 5;
2613: env = xcalloc(sizeof(*env), nenv);
2614: child_set_env(&env, &nenv, "PATH", _PATH_STDPATH);
2615: child_set_env(&env, &nenv, "USER", pw->pw_name);
2616: child_set_env(&env, &nenv, "LOGNAME", pw->pw_name);
2617: child_set_env(&env, &nenv, "HOME", pw->pw_dir);
2618: if ((cp = getenv("LANG")) != NULL)
2619: child_set_env(&env, &nenv, "LANG", cp);
2620: }
2621:
1.162 dtucker 2622: for (i = 1; i < NSIG; i++)
1.157 djm 2623: ssh_signal(i, SIG_DFL);
2624:
2625: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
2626: error("%s: open %s: %s", tag, _PATH_DEVNULL,
2627: strerror(errno));
2628: _exit(1);
2629: }
2630: if (dup2(devnull, STDIN_FILENO) == -1) {
2631: error("%s: dup2: %s", tag, strerror(errno));
2632: _exit(1);
2633: }
2634:
2635: /* Set up stdout as requested; leave stderr in place for now. */
2636: fd = -1;
2637: if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0)
2638: fd = p[1];
2639: else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0)
2640: fd = devnull;
2641: if (fd != -1 && dup2(fd, STDOUT_FILENO) == -1) {
2642: error("%s: dup2: %s", tag, strerror(errno));
2643: _exit(1);
2644: }
2645: closefrom(STDERR_FILENO + 1);
2646:
1.170 djm 2647: if (geteuid() == 0 &&
2648: initgroups(pw->pw_name, pw->pw_gid) == -1) {
2649: error("%s: initgroups(%s, %u): %s", tag,
2650: pw->pw_name, (u_int)pw->pw_gid, strerror(errno));
2651: _exit(1);
2652: }
1.157 djm 2653: if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) {
2654: error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
2655: strerror(errno));
2656: _exit(1);
2657: }
2658: if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) {
2659: error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,
2660: strerror(errno));
2661: _exit(1);
2662: }
2663: /* stdin is pointed to /dev/null at this point */
2664: if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
2665: dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
2666: error("%s: dup2: %s", tag, strerror(errno));
2667: _exit(1);
2668: }
2669: if (env != NULL)
2670: execve(av[0], av, env);
2671: else
2672: execv(av[0], av);
2673: error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve",
2674: command, strerror(errno));
2675: _exit(127);
2676: default: /* parent */
2677: break;
2678: }
2679:
2680: close(p[1]);
2681: if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0)
2682: close(p[0]);
2683: else if ((f = fdopen(p[0], "r")) == NULL) {
2684: error("%s: fdopen: %s", tag, strerror(errno));
2685: close(p[0]);
2686: /* Don't leave zombie child */
2687: kill(pid, SIGTERM);
2688: while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
2689: ;
2690: return 0;
2691: }
2692: /* Success */
2693: debug3_f("%s pid %ld", tag, (long)pid);
2694: if (child != NULL)
2695: *child = f;
2696: return pid;
1.165 djm 2697: }
2698:
2699: const char *
2700: lookup_env_in_list(const char *env, char * const *envs, size_t nenvs)
2701: {
2702: size_t i, envlen;
2703:
2704: envlen = strlen(env);
2705: for (i = 0; i < nenvs; i++) {
2706: if (strncmp(envs[i], env, envlen) == 0 &&
2707: envs[i][envlen] == '=') {
2708: return envs[i] + envlen + 1;
2709: }
2710: }
2711: return NULL;
1.176 djm 2712: }
2713:
2714: const char *
2715: lookup_setenv_in_list(const char *env, char * const *envs, size_t nenvs)
2716: {
2717: char *name, *cp;
2718: const char *ret;
2719:
2720: name = xstrdup(env);
2721: if ((cp = strchr(name, '=')) == NULL) {
2722: free(name);
2723: return NULL; /* not env=val */
2724: }
2725: *cp = '\0';
2726: ret = lookup_env_in_list(name, envs, nenvs);
2727: free(name);
2728: return ret;
1.180 djm 2729: }
2730:
2731: /*
2732: * Helpers for managing poll(2)/ppoll(2) timeouts
2733: * Will remember the earliest deadline and return it for use in poll/ppoll.
2734: */
2735:
2736: /* Initialise a poll/ppoll timeout with an indefinite deadline */
2737: void
2738: ptimeout_init(struct timespec *pt)
2739: {
2740: /*
2741: * Deliberately invalid for ppoll(2).
2742: * Will be converted to NULL in ptimeout_get_tspec() later.
2743: */
2744: pt->tv_sec = -1;
2745: pt->tv_nsec = 0;
2746: }
2747:
2748: /* Specify a poll/ppoll deadline of at most 'sec' seconds */
2749: void
2750: ptimeout_deadline_sec(struct timespec *pt, long sec)
2751: {
2752: if (pt->tv_sec == -1 || pt->tv_sec >= sec) {
2753: pt->tv_sec = sec;
2754: pt->tv_nsec = 0;
2755: }
2756: }
2757:
2758: /* Specify a poll/ppoll deadline of at most 'p' (timespec) */
2759: static void
2760: ptimeout_deadline_tsp(struct timespec *pt, struct timespec *p)
2761: {
2762: if (pt->tv_sec == -1 || timespeccmp(pt, p, >=))
2763: *pt = *p;
2764: }
2765:
2766: /* Specify a poll/ppoll deadline of at most 'ms' milliseconds */
2767: void
2768: ptimeout_deadline_ms(struct timespec *pt, long ms)
2769: {
2770: struct timespec p;
2771:
2772: p.tv_sec = ms / 1000;
2773: p.tv_nsec = (ms % 1000) * 1000000;
2774: ptimeout_deadline_tsp(pt, &p);
2775: }
2776:
2777: /* Specify a poll/ppoll deadline at wall clock monotime 'when' */
2778: void
2779: ptimeout_deadline_monotime(struct timespec *pt, time_t when)
2780: {
2781: struct timespec now, t;
2782:
2783: t.tv_sec = when;
2784: t.tv_nsec = 0;
2785: monotime_ts(&now);
2786:
2787: if (timespeccmp(&now, &t, >=))
2788: ptimeout_deadline_sec(pt, 0);
2789: else {
2790: timespecsub(&t, &now, &t);
2791: ptimeout_deadline_tsp(pt, &t);
2792: }
2793: }
2794:
2795: /* Get a poll(2) timeout value in milliseconds */
2796: int
2797: ptimeout_get_ms(struct timespec *pt)
2798: {
2799: if (pt->tv_sec == -1)
2800: return -1;
2801: if (pt->tv_sec >= (INT_MAX - (pt->tv_nsec / 1000000)) / 1000)
2802: return INT_MAX;
2803: return (pt->tv_sec * 1000) + (pt->tv_nsec / 1000000);
2804: }
2805:
2806: /* Get a ppoll(2) timeout value as a timespec pointer */
2807: struct timespec *
2808: ptimeout_get_tsp(struct timespec *pt)
2809: {
2810: return pt->tv_sec == -1 ? NULL : pt;
2811: }
2812:
2813: /* Returns non-zero if a timeout has been set (i.e. is not indefinite) */
2814: int
2815: ptimeout_isset(struct timespec *pt)
2816: {
2817: return pt->tv_sec != -1;
1.184 djm 2818: }
2819:
2820: /*
2821: * Returns zero if the library at 'path' contains symbol 's', nonzero
2822: * otherwise.
2823: */
2824: int
2825: lib_contains_symbol(const char *path, const char *s)
2826: {
2827: struct nlist nl[2];
2828: int ret = -1, r;
2829:
2830: memset(nl, 0, sizeof(nl));
2831: nl[0].n_name = xstrdup(s);
2832: nl[1].n_name = NULL;
2833: if ((r = nlist(path, nl)) == -1) {
2834: error_f("nlist failed for %s", path);
2835: goto out;
2836: }
2837: if (r != 0 || nl[0].n_value == 0 || nl[0].n_type == 0) {
2838: error_f("library %s does not contain symbol %s", path, s);
2839: goto out;
2840: }
2841: /* success */
2842: ret = 0;
2843: out:
2844: free(nl[0].n_name);
2845: return ret;
1.144 dtucker 2846: }
![[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