Annotation of src/usr.bin/ssh/misc.c, Revision 1.182
1.182 ! djm 1: /* $OpenBSD: misc.c,v 1.181 2023/03/03 02:37:58 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:
1.166 djm 74: /* remove whitespace from end of string */
75: void
76: rtrim(char *s)
77: {
78: size_t i;
79:
80: if ((i = strlen(s)) == 0)
81: return;
82: for (i--; i > 0; i--) {
1.179 deraadt 83: if (isspace((unsigned char)s[i]))
1.166 djm 84: s[i] = '\0';
85: }
86: }
87:
1.12 markus 88: /* set/unset filedescriptor to non-blocking */
1.24 djm 89: int
1.1 markus 90: set_nonblock(int fd)
91: {
92: int val;
1.8 markus 93:
1.103 krw 94: val = fcntl(fd, F_GETFL);
1.139 deraadt 95: if (val == -1) {
1.103 krw 96: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 97: return (-1);
1.1 markus 98: }
99: if (val & O_NONBLOCK) {
1.24 djm 100: debug3("fd %d is O_NONBLOCK", fd);
101: return (0);
1.1 markus 102: }
1.21 markus 103: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 104: val |= O_NONBLOCK;
1.24 djm 105: if (fcntl(fd, F_SETFL, val) == -1) {
106: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
107: strerror(errno));
108: return (-1);
109: }
110: return (0);
1.8 markus 111: }
112:
1.24 djm 113: int
1.8 markus 114: unset_nonblock(int fd)
115: {
116: int val;
117:
1.103 krw 118: val = fcntl(fd, F_GETFL);
1.139 deraadt 119: if (val == -1) {
1.103 krw 120: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 121: return (-1);
1.8 markus 122: }
123: if (!(val & O_NONBLOCK)) {
1.24 djm 124: debug3("fd %d is not O_NONBLOCK", fd);
125: return (0);
1.8 markus 126: }
1.10 markus 127: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 128: val &= ~O_NONBLOCK;
1.24 djm 129: if (fcntl(fd, F_SETFL, val) == -1) {
130: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 131: fd, strerror(errno));
1.24 djm 132: return (-1);
133: }
134: return (0);
1.66 dtucker 135: }
136:
137: const char *
138: ssh_gai_strerror(int gaierr)
139: {
1.91 djm 140: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 141: return strerror(errno);
142: return gai_strerror(gaierr);
1.15 stevesk 143: }
144:
145: /* disable nagle on socket */
146: void
147: set_nodelay(int fd)
148: {
1.17 stevesk 149: int opt;
150: socklen_t optlen;
1.15 stevesk 151:
1.16 stevesk 152: optlen = sizeof opt;
153: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 154: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 155: return;
156: }
157: if (opt == 1) {
158: debug2("fd %d is TCP_NODELAY", fd);
159: return;
160: }
161: opt = 1;
1.20 markus 162: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 163: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 164: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.117 djm 165: }
166:
167: /* Allow local port reuse in TIME_WAIT */
168: int
169: set_reuseaddr(int fd)
170: {
171: int on = 1;
172:
173: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
174: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
175: return -1;
176: }
177: return 0;
178: }
179:
1.118 djm 180: /* Get/set routing domain */
181: char *
182: get_rdomain(int fd)
183: {
184: int rtable;
185: char *ret;
186: socklen_t len = sizeof(rtable);
187:
188: if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
189: error("Failed to get routing domain for fd %d: %s",
190: fd, strerror(errno));
191: return NULL;
192: }
193: xasprintf(&ret, "%d", rtable);
194: return ret;
195: }
196:
1.117 djm 197: int
198: set_rdomain(int fd, const char *name)
199: {
200: int rtable;
201: const char *errstr;
202:
203: if (name == NULL)
204: return 0; /* default table */
205:
206: rtable = (int)strtonum(name, 0, 255, &errstr);
207: if (errstr != NULL) {
208: /* Shouldn't happen */
209: error("Invalid routing domain \"%s\": %s", name, errstr);
210: return -1;
211: }
212: if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
213: &rtable, sizeof(rtable)) == -1) {
214: error("Failed to set routing domain %d on fd %d: %s",
215: rtable, fd, strerror(errno));
216: return -1;
217: }
1.136 djm 218: return 0;
1.156 djm 219: }
220:
221: int
222: get_sock_af(int fd)
223: {
224: struct sockaddr_storage to;
225: socklen_t tolen = sizeof(to);
226:
227: memset(&to, 0, sizeof(to));
228: if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1)
229: return -1;
230: return to.ss_family;
231: }
232:
233: void
234: set_sock_tos(int fd, int tos)
235: {
236: int af;
237:
238: switch ((af = get_sock_af(fd))) {
239: case -1:
240: /* assume not a socket */
241: break;
242: case AF_INET:
243: debug3_f("set socket %d IP_TOS 0x%02x", fd, tos);
244: if (setsockopt(fd, IPPROTO_IP, IP_TOS,
245: &tos, sizeof(tos)) == -1) {
1.178 dtucker 246: error("setsockopt socket %d IP_TOS %d: %s",
1.156 djm 247: fd, tos, strerror(errno));
248: }
249: break;
250: case AF_INET6:
251: debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos);
252: if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS,
253: &tos, sizeof(tos)) == -1) {
1.178 dtucker 254: error("setsockopt socket %d IPV6_TCLASS %d: %s",
1.156 djm 255: fd, tos, strerror(errno));
256: }
257: break;
258: default:
259: debug2_f("unsupported socket family %d", af);
260: break;
261: }
1.136 djm 262: }
263:
264: /*
1.143 dtucker 265: * Wait up to *timeoutp milliseconds for events on fd. Updates
1.136 djm 266: * *timeoutp with time remaining.
267: * Returns 0 if fd ready or -1 on timeout or error (see errno).
268: */
1.143 dtucker 269: static int
270: waitfd(int fd, int *timeoutp, short events)
1.136 djm 271: {
272: struct pollfd pfd;
273: struct timeval t_start;
274: int oerrno, r;
275:
276: pfd.fd = fd;
1.143 dtucker 277: pfd.events = events;
1.136 djm 278: for (; *timeoutp >= 0;) {
1.159 dtucker 279: monotime_tv(&t_start);
1.136 djm 280: r = poll(&pfd, 1, *timeoutp);
281: oerrno = errno;
282: ms_subtract_diff(&t_start, timeoutp);
283: errno = oerrno;
284: if (r > 0)
285: return 0;
1.153 djm 286: else if (r == -1 && errno != EAGAIN && errno != EINTR)
1.136 djm 287: return -1;
288: else if (r == 0)
289: break;
290: }
291: /* timeout */
292: errno = ETIMEDOUT;
293: return -1;
294: }
295:
296: /*
1.143 dtucker 297: * Wait up to *timeoutp milliseconds for fd to be readable. Updates
298: * *timeoutp with time remaining.
299: * Returns 0 if fd ready or -1 on timeout or error (see errno).
300: */
301: int
302: waitrfd(int fd, int *timeoutp) {
303: return waitfd(fd, timeoutp, POLLIN);
304: }
305:
306: /*
1.136 djm 307: * Attempt a non-blocking connect(2) to the specified address, waiting up to
308: * *timeoutp milliseconds for the connection to complete. If the timeout is
309: * <=0, then wait indefinitely.
310: *
311: * Returns 0 on success or -1 on failure.
312: */
313: int
314: timeout_connect(int sockfd, const struct sockaddr *serv_addr,
315: socklen_t addrlen, int *timeoutp)
316: {
317: int optval = 0;
318: socklen_t optlen = sizeof(optval);
319:
320: /* No timeout: just do a blocking connect() */
321: if (timeoutp == NULL || *timeoutp <= 0)
322: return connect(sockfd, serv_addr, addrlen);
323:
324: set_nonblock(sockfd);
1.153 djm 325: for (;;) {
326: if (connect(sockfd, serv_addr, addrlen) == 0) {
327: /* Succeeded already? */
328: unset_nonblock(sockfd);
329: return 0;
330: } else if (errno == EINTR)
331: continue;
332: else if (errno != EINPROGRESS)
333: return -1;
334: break;
335: }
1.136 djm 336:
1.143 dtucker 337: if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
1.136 djm 338: return -1;
339:
340: /* Completed or failed */
341: if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
342: debug("getsockopt: %s", strerror(errno));
343: return -1;
344: }
345: if (optval != 0) {
346: errno = optval;
347: return -1;
348: }
349: unset_nonblock(sockfd);
1.117 djm 350: return 0;
1.72 reyk 351: }
352:
1.1 markus 353: /* Characters considered whitespace in strsep calls. */
354: #define WHITESPACE " \t\r\n"
1.46 dtucker 355: #define QUOTE "\""
1.1 markus 356:
1.12 markus 357: /* return next token in configuration line */
1.129 djm 358: static char *
359: strdelim_internal(char **s, int split_equals)
1.1 markus 360: {
1.126 djm 361: char *old;
1.1 markus 362: int wspace = 0;
363:
364: if (*s == NULL)
365: return NULL;
366:
367: old = *s;
368:
1.129 djm 369: *s = strpbrk(*s,
370: split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
1.1 markus 371: if (*s == NULL)
372: return (old);
373:
1.46 dtucker 374: if (*s[0] == '\"') {
375: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
376: /* Find matching quote */
1.126 djm 377: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
378: return (NULL); /* no matching quote */
379: } else {
380: *s[0] = '\0';
381: *s += strspn(*s + 1, WHITESPACE) + 1;
382: return (old);
1.46 dtucker 383: }
384: }
385:
1.1 markus 386: /* Allow only one '=' to be skipped */
1.129 djm 387: if (split_equals && *s[0] == '=')
1.1 markus 388: wspace = 1;
389: *s[0] = '\0';
390:
1.46 dtucker 391: /* Skip any extra whitespace after first token */
1.1 markus 392: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 393: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 394: *s += strspn(*s + 1, WHITESPACE) + 1;
395:
396: return (old);
1.129 djm 397: }
398:
399: /*
400: * Return next token in configuration line; splts on whitespace or a
401: * single '=' character.
402: */
403: char *
404: strdelim(char **s)
405: {
406: return strdelim_internal(s, 1);
407: }
408:
409: /*
410: * Return next token in configuration line; splts on whitespace only.
411: */
412: char *
413: strdelimw(char **s)
414: {
415: return strdelim_internal(s, 0);
1.2 markus 416: }
417:
418: struct passwd *
419: pwcopy(struct passwd *pw)
420: {
1.49 djm 421: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 422:
1.2 markus 423: copy->pw_name = xstrdup(pw->pw_name);
424: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 425: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 426: copy->pw_uid = pw->pw_uid;
427: copy->pw_gid = pw->pw_gid;
1.11 markus 428: copy->pw_expire = pw->pw_expire;
429: copy->pw_change = pw->pw_change;
1.2 markus 430: copy->pw_class = xstrdup(pw->pw_class);
431: copy->pw_dir = xstrdup(pw->pw_dir);
432: copy->pw_shell = xstrdup(pw->pw_shell);
433: return copy;
1.5 stevesk 434: }
435:
1.12 markus 436: /*
437: * Convert ASCII string to TCP/IP port number.
1.70 djm 438: * Port must be >=0 and <=65535.
439: * Return -1 if invalid.
1.12 markus 440: */
441: int
442: a2port(const char *s)
1.5 stevesk 443: {
1.133 naddy 444: struct servent *se;
1.70 djm 445: long long port;
446: const char *errstr;
1.5 stevesk 447:
1.70 djm 448: port = strtonum(s, 0, 65535, &errstr);
1.133 naddy 449: if (errstr == NULL)
450: return (int)port;
451: if ((se = getservbyname(s, "tcp")) != NULL)
452: return ntohs(se->s_port);
453: return -1;
1.9 stevesk 454: }
455:
1.36 reyk 456: int
457: a2tun(const char *s, int *remote)
458: {
459: const char *errstr = NULL;
460: char *sp, *ep;
461: int tun;
462:
463: if (remote != NULL) {
1.37 reyk 464: *remote = SSH_TUNID_ANY;
1.36 reyk 465: sp = xstrdup(s);
466: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 467: free(sp);
1.36 reyk 468: return (a2tun(s, NULL));
469: }
470: ep[0] = '\0'; ep++;
471: *remote = a2tun(ep, NULL);
472: tun = a2tun(sp, NULL);
1.89 djm 473: free(sp);
1.37 reyk 474: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 475: }
476:
477: if (strcasecmp(s, "any") == 0)
1.37 reyk 478: return (SSH_TUNID_ANY);
1.36 reyk 479:
1.37 reyk 480: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
481: if (errstr != NULL)
482: return (SSH_TUNID_ERR);
1.36 reyk 483:
484: return (tun);
485: }
486:
1.9 stevesk 487: #define SECONDS 1
488: #define MINUTES (SECONDS * 60)
489: #define HOURS (MINUTES * 60)
490: #define DAYS (HOURS * 24)
491: #define WEEKS (DAYS * 7)
492:
1.12 markus 493: /*
494: * Convert a time string into seconds; format is
495: * a sequence of:
496: * time[qualifier]
497: *
498: * Valid time qualifiers are:
499: * <none> seconds
500: * s|S seconds
501: * m|M minutes
502: * h|H hours
503: * d|D days
504: * w|W weeks
505: *
506: * Examples:
507: * 90m 90 minutes
508: * 1h30m 90 minutes
509: * 2d 2 days
510: * 1w 1 week
511: *
512: * Return -1 if time string is invalid.
513: */
1.158 dtucker 514: int
1.12 markus 515: convtime(const char *s)
1.9 stevesk 516: {
1.149 dtucker 517: long total, secs, multiplier;
1.9 stevesk 518: const char *p;
519: char *endp;
520:
521: errno = 0;
522: total = 0;
523: p = s;
524:
525: if (p == NULL || *p == '\0')
526: return -1;
527:
528: while (*p) {
529: secs = strtol(p, &endp, 10);
530: if (p == endp ||
1.158 dtucker 531: (errno == ERANGE && (secs == INT_MIN || secs == INT_MAX)) ||
1.9 stevesk 532: secs < 0)
533: return -1;
534:
1.149 dtucker 535: multiplier = 1;
1.9 stevesk 536: switch (*endp++) {
537: case '\0':
538: endp--;
1.48 deraadt 539: break;
1.9 stevesk 540: case 's':
541: case 'S':
542: break;
543: case 'm':
544: case 'M':
1.108 dtucker 545: multiplier = MINUTES;
1.9 stevesk 546: break;
547: case 'h':
548: case 'H':
1.108 dtucker 549: multiplier = HOURS;
1.9 stevesk 550: break;
551: case 'd':
552: case 'D':
1.108 dtucker 553: multiplier = DAYS;
1.9 stevesk 554: break;
555: case 'w':
556: case 'W':
1.108 dtucker 557: multiplier = WEEKS;
1.9 stevesk 558: break;
559: default:
560: return -1;
561: }
1.160 dtucker 562: if (secs > INT_MAX / multiplier)
1.108 dtucker 563: return -1;
564: secs *= multiplier;
1.160 dtucker 565: if (total > INT_MAX - secs)
1.108 dtucker 566: return -1;
1.9 stevesk 567: total += secs;
568: if (total < 0)
569: return -1;
570: p = endp;
571: }
572:
573: return total;
1.148 djm 574: }
575:
576: #define TF_BUFS 8
577: #define TF_LEN 9
578:
579: const char *
580: fmt_timeframe(time_t t)
581: {
582: char *buf;
583: static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */
584: static int idx = 0;
585: unsigned int sec, min, hrs, day;
586: unsigned long long week;
587:
588: buf = tfbuf[idx++];
589: if (idx == TF_BUFS)
590: idx = 0;
591:
592: week = t;
593:
594: sec = week % 60;
595: week /= 60;
596: min = week % 60;
597: week /= 60;
598: hrs = week % 24;
599: week /= 24;
600: day = week % 7;
601: week /= 7;
602:
603: if (week > 0)
604: snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
605: else if (day > 0)
606: snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
607: else
608: snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);
609:
610: return (buf);
1.56 dtucker 611: }
612:
613: /*
614: * Returns a standardized host+port identifier string.
615: * Caller must free returned string.
616: */
617: char *
618: put_host_port(const char *host, u_short port)
619: {
620: char *hoststr;
621:
622: if (port == 0 || port == SSH_DEFAULT_PORT)
623: return(xstrdup(host));
1.138 deraadt 624: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
1.56 dtucker 625: fatal("put_host_port: asprintf: %s", strerror(errno));
626: debug3("put_host_port: %s", hoststr);
627: return hoststr;
1.28 djm 628: }
629:
630: /*
631: * Search for next delimiter between hostnames/addresses and ports.
632: * Argument may be modified (for termination).
633: * Returns *cp if parsing succeeds.
1.114 millert 634: * *cp is set to the start of the next field, if one was found.
635: * The delimiter char, if present, is stored in delim.
1.28 djm 636: * If this is the last field, *cp is set to NULL.
637: */
1.137 dtucker 638: char *
1.114 millert 639: hpdelim2(char **cp, char *delim)
1.28 djm 640: {
641: char *s, *old;
642:
643: if (cp == NULL || *cp == NULL)
644: return NULL;
645:
646: old = s = *cp;
647: if (*s == '[') {
648: if ((s = strchr(s, ']')) == NULL)
649: return NULL;
650: else
651: s++;
652: } else if ((s = strpbrk(s, ":/")) == NULL)
653: s = *cp + strlen(*cp); /* skip to end (see first case below) */
654:
655: switch (*s) {
656: case '\0':
657: *cp = NULL; /* no more fields*/
658: break;
1.29 deraadt 659:
1.28 djm 660: case ':':
661: case '/':
1.114 millert 662: if (delim != NULL)
663: *delim = *s;
1.28 djm 664: *s = '\0'; /* terminate */
665: *cp = s + 1;
666: break;
1.29 deraadt 667:
1.28 djm 668: default:
669: return NULL;
670: }
671:
672: return old;
1.6 mouring 673: }
674:
1.173 dtucker 675: /* The common case: only accept colon as delimiter. */
1.6 mouring 676: char *
1.114 millert 677: hpdelim(char **cp)
678: {
1.174 dtucker 679: char *r, delim = '\0';
1.173 dtucker 680:
681: r = hpdelim2(cp, &delim);
682: if (delim == '/')
683: return NULL;
684: return r;
1.114 millert 685: }
686:
687: char *
1.6 mouring 688: cleanhostname(char *host)
689: {
690: if (*host == '[' && host[strlen(host) - 1] == ']') {
691: host[strlen(host) - 1] = '\0';
692: return (host + 1);
693: } else
694: return host;
695: }
696:
697: char *
698: colon(char *cp)
699: {
700: int flag = 0;
701:
702: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 703: return NULL;
1.6 mouring 704: if (*cp == '[')
705: flag = 1;
706:
707: for (; *cp; ++cp) {
708: if (*cp == '@' && *(cp+1) == '[')
709: flag = 1;
710: if (*cp == ']' && *(cp+1) == ':' && flag)
711: return (cp+1);
712: if (*cp == ':' && !flag)
713: return (cp);
714: if (*cp == '/')
1.76 djm 715: return NULL;
1.6 mouring 716: }
1.76 djm 717: return NULL;
1.105 djm 718: }
719:
720: /*
1.114 millert 721: * Parse a [user@]host:[path] string.
722: * Caller must free returned user, host and path.
723: * Any of the pointer return arguments may be NULL (useful for syntax checking).
724: * If user was not specified then *userp will be set to NULL.
725: * If host was not specified then *hostp will be set to NULL.
726: * If path was not specified then *pathp will be set to ".".
727: * Returns 0 on success, -1 on failure.
728: */
729: int
730: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
731: {
732: char *user = NULL, *host = NULL, *path = NULL;
733: char *sdup, *tmp;
734: int ret = -1;
735:
736: if (userp != NULL)
737: *userp = NULL;
738: if (hostp != NULL)
739: *hostp = NULL;
740: if (pathp != NULL)
741: *pathp = NULL;
742:
1.116 millert 743: sdup = xstrdup(s);
1.114 millert 744:
745: /* Check for remote syntax: [user@]host:[path] */
746: if ((tmp = colon(sdup)) == NULL)
747: goto out;
748:
749: /* Extract optional path */
750: *tmp++ = '\0';
751: if (*tmp == '\0')
752: tmp = ".";
753: path = xstrdup(tmp);
754:
755: /* Extract optional user and mandatory host */
756: tmp = strrchr(sdup, '@');
757: if (tmp != NULL) {
758: *tmp++ = '\0';
759: host = xstrdup(cleanhostname(tmp));
760: if (*sdup != '\0')
761: user = xstrdup(sdup);
762: } else {
763: host = xstrdup(cleanhostname(sdup));
764: user = NULL;
765: }
766:
767: /* Success */
768: if (userp != NULL) {
769: *userp = user;
770: user = NULL;
771: }
772: if (hostp != NULL) {
773: *hostp = host;
774: host = NULL;
1.116 millert 775: }
1.114 millert 776: if (pathp != NULL) {
777: *pathp = path;
778: path = NULL;
1.116 millert 779: }
1.114 millert 780: ret = 0;
781: out:
782: free(sdup);
783: free(user);
784: free(host);
785: free(path);
786: return ret;
787: }
788:
789: /*
1.105 djm 790: * Parse a [user@]host[:port] string.
791: * Caller must free returned user and host.
792: * Any of the pointer return arguments may be NULL (useful for syntax checking).
793: * If user was not specified then *userp will be set to NULL.
794: * If port was not specified then *portp will be -1.
795: * Returns 0 on success, -1 on failure.
796: */
797: int
798: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
799: {
800: char *sdup, *cp, *tmp;
801: char *user = NULL, *host = NULL;
802: int port = -1, ret = -1;
803:
804: if (userp != NULL)
805: *userp = NULL;
806: if (hostp != NULL)
807: *hostp = NULL;
808: if (portp != NULL)
809: *portp = -1;
810:
811: if ((sdup = tmp = strdup(s)) == NULL)
812: return -1;
813: /* Extract optional username */
1.114 millert 814: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 815: *cp = '\0';
816: if (*tmp == '\0')
817: goto out;
818: if ((user = strdup(tmp)) == NULL)
819: goto out;
820: tmp = cp + 1;
821: }
822: /* Extract mandatory hostname */
823: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
824: goto out;
825: host = xstrdup(cleanhostname(cp));
826: /* Convert and verify optional port */
827: if (tmp != NULL && *tmp != '\0') {
828: if ((port = a2port(tmp)) <= 0)
829: goto out;
830: }
831: /* Success */
832: if (userp != NULL) {
833: *userp = user;
834: user = NULL;
835: }
836: if (hostp != NULL) {
837: *hostp = host;
838: host = NULL;
839: }
840: if (portp != NULL)
841: *portp = port;
842: ret = 0;
843: out:
844: free(sdup);
845: free(user);
846: free(host);
847: return ret;
1.7 mouring 848: }
849:
1.114 millert 850: /*
851: * Converts a two-byte hex string to decimal.
852: * Returns the decimal value or -1 for invalid input.
853: */
854: static int
855: hexchar(const char *s)
856: {
857: unsigned char result[2];
858: int i;
859:
860: for (i = 0; i < 2; i++) {
861: if (s[i] >= '0' && s[i] <= '9')
862: result[i] = (unsigned char)(s[i] - '0');
863: else if (s[i] >= 'a' && s[i] <= 'f')
864: result[i] = (unsigned char)(s[i] - 'a') + 10;
865: else if (s[i] >= 'A' && s[i] <= 'F')
866: result[i] = (unsigned char)(s[i] - 'A') + 10;
867: else
868: return -1;
869: }
870: return (result[0] << 4) | result[1];
871: }
872:
873: /*
874: * Decode an url-encoded string.
875: * Returns a newly allocated string on success or NULL on failure.
876: */
877: static char *
878: urldecode(const char *src)
879: {
880: char *ret, *dst;
881: int ch;
1.182 ! djm 882: size_t srclen;
1.114 millert 883:
1.182 ! djm 884: if ((srclen = strlen(src)) >= SIZE_MAX)
! 885: fatal_f("input too large");
! 886: ret = xmalloc(srclen + 1);
1.114 millert 887: for (dst = ret; *src != '\0'; src++) {
888: switch (*src) {
889: case '+':
890: *dst++ = ' ';
891: break;
892: case '%':
893: if (!isxdigit((unsigned char)src[1]) ||
894: !isxdigit((unsigned char)src[2]) ||
895: (ch = hexchar(src + 1)) == -1) {
896: free(ret);
897: return NULL;
898: }
899: *dst++ = ch;
900: src += 2;
901: break;
902: default:
903: *dst++ = *src;
904: break;
905: }
906: }
907: *dst = '\0';
908:
909: return ret;
910: }
911:
912: /*
913: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
914: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
915: * Either user or path may be url-encoded (but not host or port).
916: * Caller must free returned user, host and path.
917: * Any of the pointer return arguments may be NULL (useful for syntax checking)
918: * but the scheme must always be specified.
919: * If user was not specified then *userp will be set to NULL.
920: * If port was not specified then *portp will be -1.
921: * If path was not specified then *pathp will be set to NULL.
922: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
923: */
924: int
925: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
926: int *portp, char **pathp)
927: {
928: char *uridup, *cp, *tmp, ch;
929: char *user = NULL, *host = NULL, *path = NULL;
930: int port = -1, ret = -1;
931: size_t len;
932:
933: len = strlen(scheme);
934: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
935: return 1;
936: uri += len + 3;
937:
938: if (userp != NULL)
939: *userp = NULL;
940: if (hostp != NULL)
941: *hostp = NULL;
942: if (portp != NULL)
943: *portp = -1;
944: if (pathp != NULL)
945: *pathp = NULL;
946:
947: uridup = tmp = xstrdup(uri);
948:
949: /* Extract optional ssh-info (username + connection params) */
950: if ((cp = strchr(tmp, '@')) != NULL) {
951: char *delim;
952:
953: *cp = '\0';
954: /* Extract username and connection params */
955: if ((delim = strchr(tmp, ';')) != NULL) {
956: /* Just ignore connection params for now */
957: *delim = '\0';
958: }
959: if (*tmp == '\0') {
960: /* Empty username */
961: goto out;
962: }
963: if ((user = urldecode(tmp)) == NULL)
964: goto out;
965: tmp = cp + 1;
966: }
967:
968: /* Extract mandatory hostname */
969: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
970: goto out;
971: host = xstrdup(cleanhostname(cp));
972: if (!valid_domain(host, 0, NULL))
973: goto out;
974:
975: if (tmp != NULL && *tmp != '\0') {
976: if (ch == ':') {
977: /* Convert and verify port. */
978: if ((cp = strchr(tmp, '/')) != NULL)
979: *cp = '\0';
980: if ((port = a2port(tmp)) <= 0)
981: goto out;
982: tmp = cp ? cp + 1 : NULL;
983: }
984: if (tmp != NULL && *tmp != '\0') {
985: /* Extract optional path */
986: if ((path = urldecode(tmp)) == NULL)
987: goto out;
988: }
989: }
990:
991: /* Success */
992: if (userp != NULL) {
993: *userp = user;
994: user = NULL;
995: }
996: if (hostp != NULL) {
997: *hostp = host;
998: host = NULL;
999: }
1000: if (portp != NULL)
1001: *portp = port;
1002: if (pathp != NULL) {
1003: *pathp = path;
1004: path = NULL;
1005: }
1006: ret = 0;
1007: out:
1008: free(uridup);
1009: free(user);
1010: free(host);
1011: free(path);
1012: return ret;
1013: }
1014:
1.12 markus 1015: /* function to assist building execv() arguments */
1.7 mouring 1016: void
1017: addargs(arglist *args, char *fmt, ...)
1018: {
1019: va_list ap;
1.42 djm 1020: char *cp;
1.25 avsm 1021: u_int nalloc;
1.42 djm 1022: int r;
1.7 mouring 1023:
1024: va_start(ap, fmt);
1.42 djm 1025: r = vasprintf(&cp, fmt, ap);
1.7 mouring 1026: va_end(ap);
1.42 djm 1027: if (r == -1)
1.175 djm 1028: fatal_f("argument too long");
1.7 mouring 1029:
1.22 markus 1030: nalloc = args->nalloc;
1.7 mouring 1031: if (args->list == NULL) {
1.22 markus 1032: nalloc = 32;
1.7 mouring 1033: args->num = 0;
1.175 djm 1034: } else if (args->num > (256 * 1024))
1035: fatal_f("too many arguments");
1036: else if (args->num >= args->nalloc)
1037: fatal_f("arglist corrupt");
1038: else if (args->num+2 >= nalloc)
1.22 markus 1039: nalloc *= 2;
1.7 mouring 1040:
1.175 djm 1041: args->list = xrecallocarray(args->list, args->nalloc,
1042: nalloc, sizeof(char *));
1.22 markus 1043: args->nalloc = nalloc;
1.42 djm 1044: args->list[args->num++] = cp;
1.7 mouring 1045: args->list[args->num] = NULL;
1.42 djm 1046: }
1047:
1048: void
1049: replacearg(arglist *args, u_int which, char *fmt, ...)
1050: {
1051: va_list ap;
1052: char *cp;
1053: int r;
1054:
1055: va_start(ap, fmt);
1056: r = vasprintf(&cp, fmt, ap);
1057: va_end(ap);
1058: if (r == -1)
1.175 djm 1059: fatal_f("argument too long");
1060: if (args->list == NULL || args->num >= args->nalloc)
1061: fatal_f("arglist corrupt");
1.42 djm 1062:
1063: if (which >= args->num)
1.175 djm 1064: fatal_f("tried to replace invalid arg %d >= %d",
1.42 djm 1065: which, args->num);
1.89 djm 1066: free(args->list[which]);
1.42 djm 1067: args->list[which] = cp;
1068: }
1069:
1070: void
1071: freeargs(arglist *args)
1072: {
1073: u_int i;
1074:
1.175 djm 1075: if (args == NULL)
1076: return;
1077: if (args->list != NULL && args->num < args->nalloc) {
1.42 djm 1078: for (i = 0; i < args->num; i++)
1.89 djm 1079: free(args->list[i]);
1080: free(args->list);
1.42 djm 1081: }
1.175 djm 1082: args->nalloc = args->num = 0;
1083: args->list = NULL;
1.30 djm 1084: }
1085:
1086: /*
1087: * Expands tildes in the file name. Returns data allocated by xmalloc.
1088: * Warning: this calls getpw*.
1089: */
1.169 djm 1090: int
1091: tilde_expand(const char *filename, uid_t uid, char **retp)
1.30 djm 1092: {
1.172 djm 1093: char *ocopy = NULL, *copy, *s = NULL;
1094: const char *path = NULL, *user = NULL;
1.30 djm 1095: struct passwd *pw;
1.172 djm 1096: size_t len;
1097: int ret = -1, r, slash;
1.30 djm 1098:
1.172 djm 1099: *retp = NULL;
1.169 djm 1100: if (*filename != '~') {
1101: *retp = xstrdup(filename);
1102: return 0;
1103: }
1.172 djm 1104: ocopy = copy = xstrdup(filename + 1);
1.30 djm 1105:
1.172 djm 1106: if (*copy == '\0') /* ~ */
1107: path = NULL;
1108: else if (*copy == '/') {
1109: copy += strspn(copy, "/");
1110: if (*copy == '\0')
1111: path = NULL; /* ~/ */
1112: else
1113: path = copy; /* ~/path */
1114: } else {
1115: user = copy;
1116: if ((path = strchr(copy, '/')) != NULL) {
1117: copy[path - copy] = '\0';
1118: path++;
1119: path += strspn(path, "/");
1120: if (*path == '\0') /* ~user/ */
1121: path = NULL;
1122: /* else ~user/path */
1.169 djm 1123: }
1.172 djm 1124: /* else ~user */
1125: }
1126: if (user != NULL) {
1.169 djm 1127: if ((pw = getpwnam(user)) == NULL) {
1128: error_f("No such user %s", user);
1.172 djm 1129: goto out;
1.169 djm 1130: }
1.172 djm 1131: } else if ((pw = getpwuid(uid)) == NULL) {
1.169 djm 1132: error_f("No such uid %ld", (long)uid);
1.172 djm 1133: goto out;
1.169 djm 1134: }
1.30 djm 1135:
1136: /* Make sure directory has a trailing '/' */
1.172 djm 1137: slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/';
1.30 djm 1138:
1.172 djm 1139: if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir,
1140: slash ? "/" : "", path != NULL ? path : "")) <= 0) {
1141: error_f("xasprintf failed");
1142: goto out;
1143: }
1144: if (r >= PATH_MAX) {
1.169 djm 1145: error_f("Path too long");
1.172 djm 1146: goto out;
1.169 djm 1147: }
1.172 djm 1148: /* success */
1149: ret = 0;
1150: *retp = s;
1151: s = NULL;
1152: out:
1153: free(s);
1154: free(ocopy);
1155: return ret;
1.169 djm 1156: }
1157:
1158: char *
1159: tilde_expand_filename(const char *filename, uid_t uid)
1160: {
1161: char *ret;
1.30 djm 1162:
1.169 djm 1163: if (tilde_expand(filename, uid, &ret) != 0)
1164: cleanup_exit(255);
1165: return ret;
1.31 djm 1166: }
1167:
1168: /*
1.150 dtucker 1169: * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT}
1170: * substitutions. A number of escapes may be specified as
1171: * (char *escape_chars, char *replacement) pairs. The list must be terminated
1172: * by a NULL escape_char. Returns replaced string in memory allocated by
1173: * xmalloc which the caller must free.
1.31 djm 1174: */
1.150 dtucker 1175: static char *
1176: vdollar_percent_expand(int *parseerror, int dollar, int percent,
1177: const char *string, va_list ap)
1.31 djm 1178: {
1179: #define EXPAND_MAX_KEYS 16
1.150 dtucker 1180: u_int num_keys = 0, i;
1.31 djm 1181: struct {
1182: const char *key;
1183: const char *repl;
1184: } keys[EXPAND_MAX_KEYS];
1.140 djm 1185: struct sshbuf *buf;
1.150 dtucker 1186: int r, missingvar = 0;
1187: char *ret = NULL, *var, *varend, *val;
1188: size_t len;
1.140 djm 1189:
1190: if ((buf = sshbuf_new()) == NULL)
1.155 djm 1191: fatal_f("sshbuf_new failed");
1.150 dtucker 1192: if (parseerror == NULL)
1.155 djm 1193: fatal_f("null parseerror arg");
1.150 dtucker 1194: *parseerror = 1;
1195:
1196: /* Gather keys if we're doing percent expansion. */
1197: if (percent) {
1198: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
1199: keys[num_keys].key = va_arg(ap, char *);
1200: if (keys[num_keys].key == NULL)
1201: break;
1202: keys[num_keys].repl = va_arg(ap, char *);
1.155 djm 1203: if (keys[num_keys].repl == NULL) {
1204: fatal_f("NULL replacement for token %s",
1205: keys[num_keys].key);
1206: }
1.150 dtucker 1207: }
1208: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
1.155 djm 1209: fatal_f("too many keys");
1.150 dtucker 1210: if (num_keys == 0)
1.155 djm 1211: fatal_f("percent expansion without token list");
1.31 djm 1212: }
1213:
1214: /* Expand string */
1215: for (i = 0; *string != '\0'; string++) {
1.150 dtucker 1216: /* Optionally process ${ENVIRONMENT} expansions. */
1217: if (dollar && string[0] == '$' && string[1] == '{') {
1218: string += 2; /* skip over '${' */
1219: if ((varend = strchr(string, '}')) == NULL) {
1.155 djm 1220: error_f("environment variable '%s' missing "
1.164 djm 1221: "closing '}'", string);
1.150 dtucker 1222: goto out;
1223: }
1224: len = varend - string;
1225: if (len == 0) {
1.155 djm 1226: error_f("zero-length environment variable");
1.150 dtucker 1227: goto out;
1228: }
1229: var = xmalloc(len + 1);
1230: (void)strlcpy(var, string, len + 1);
1231: if ((val = getenv(var)) == NULL) {
1.155 djm 1232: error_f("env var ${%s} has no value", var);
1.150 dtucker 1233: missingvar = 1;
1234: } else {
1.155 djm 1235: debug3_f("expand ${%s} -> '%s'", var, val);
1.150 dtucker 1236: if ((r = sshbuf_put(buf, val, strlen(val))) !=0)
1.155 djm 1237: fatal_fr(r, "sshbuf_put ${}");
1.150 dtucker 1238: }
1239: free(var);
1240: string += len;
1241: continue;
1242: }
1243:
1244: /*
1245: * Process percent expansions if we have a list of TOKENs.
1246: * If we're not doing percent expansion everything just gets
1247: * appended here.
1248: */
1249: if (*string != '%' || !percent) {
1.31 djm 1250: append:
1.155 djm 1251: if ((r = sshbuf_put_u8(buf, *string)) != 0)
1252: fatal_fr(r, "sshbuf_put_u8 %%");
1.31 djm 1253: continue;
1254: }
1255: string++;
1.73 djm 1256: /* %% case */
1.31 djm 1257: if (*string == '%')
1258: goto append;
1.150 dtucker 1259: if (*string == '\0') {
1.155 djm 1260: error_f("invalid format");
1.150 dtucker 1261: goto out;
1262: }
1.140 djm 1263: for (i = 0; i < num_keys; i++) {
1264: if (strchr(keys[i].key, *string) != NULL) {
1265: if ((r = sshbuf_put(buf, keys[i].repl,
1.155 djm 1266: strlen(keys[i].repl))) != 0)
1267: fatal_fr(r, "sshbuf_put %%-repl");
1.31 djm 1268: break;
1269: }
1270: }
1.150 dtucker 1271: if (i >= num_keys) {
1.155 djm 1272: error_f("unknown key %%%c", *string);
1.150 dtucker 1273: goto out;
1274: }
1.31 djm 1275: }
1.150 dtucker 1276: if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL)
1.155 djm 1277: fatal_f("sshbuf_dup_string failed");
1.150 dtucker 1278: *parseerror = 0;
1279: out:
1.140 djm 1280: sshbuf_free(buf);
1.150 dtucker 1281: return *parseerror ? NULL : ret;
1282: #undef EXPAND_MAX_KEYS
1283: }
1284:
1.152 dtucker 1285: /*
1286: * Expand only environment variables.
1287: * Note that although this function is variadic like the other similar
1288: * functions, any such arguments will be unused.
1289: */
1290:
1.150 dtucker 1291: char *
1.152 dtucker 1292: dollar_expand(int *parseerr, const char *string, ...)
1.150 dtucker 1293: {
1294: char *ret;
1295: int err;
1.152 dtucker 1296: va_list ap;
1.150 dtucker 1297:
1.152 dtucker 1298: va_start(ap, string);
1299: ret = vdollar_percent_expand(&err, 1, 0, string, ap);
1300: va_end(ap);
1.150 dtucker 1301: if (parseerr != NULL)
1302: *parseerr = err;
1303: return ret;
1304: }
1305:
1306: /*
1307: * Returns expanded string or NULL if a specified environment variable is
1308: * not defined, or calls fatal if the string is invalid.
1309: */
1310: char *
1311: percent_expand(const char *string, ...)
1312: {
1313: char *ret;
1314: int err;
1315: va_list ap;
1316:
1317: va_start(ap, string);
1318: ret = vdollar_percent_expand(&err, 0, 1, string, ap);
1319: va_end(ap);
1320: if (err)
1.155 djm 1321: fatal_f("failed");
1.150 dtucker 1322: return ret;
1323: }
1324:
1325: /*
1326: * Returns expanded string or NULL if a specified environment variable is
1327: * not defined, or calls fatal if the string is invalid.
1328: */
1329: char *
1330: percent_dollar_expand(const char *string, ...)
1331: {
1332: char *ret;
1333: int err;
1334: va_list ap;
1335:
1336: va_start(ap, string);
1337: ret = vdollar_percent_expand(&err, 1, 1, string, ap);
1338: va_end(ap);
1339: if (err)
1.155 djm 1340: fatal_f("failed");
1.140 djm 1341: return ret;
1.36 reyk 1342: }
1343:
1344: int
1.115 djm 1345: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1346: {
1.37 reyk 1347: struct ifreq ifr;
1.36 reyk 1348: char name[100];
1.37 reyk 1349: int fd = -1, sock;
1.99 sthen 1350: const char *tunbase = "tun";
1351:
1.115 djm 1352: if (ifname != NULL)
1353: *ifname = NULL;
1354:
1.99 sthen 1355: if (mode == SSH_TUNMODE_ETHERNET)
1356: tunbase = "tap";
1.36 reyk 1357:
1.37 reyk 1358: /* Open the tunnel device */
1359: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1360: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1361: fd = open(name, O_RDWR);
1362: } else if (tun == SSH_TUNID_ANY) {
1363: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1364: snprintf(name, sizeof(name), "/dev/%s%d",
1365: tunbase, tun);
1.37 reyk 1366: if ((fd = open(name, O_RDWR)) >= 0)
1367: break;
1.36 reyk 1368: }
1369: } else {
1.155 djm 1370: debug_f("invalid tunnel %u", tun);
1.98 djm 1371: return -1;
1.37 reyk 1372: }
1373:
1.139 deraadt 1374: if (fd == -1) {
1.155 djm 1375: debug_f("%s open: %s", name, strerror(errno));
1.98 djm 1376: return -1;
1.36 reyk 1377: }
1.37 reyk 1378:
1.155 djm 1379: debug_f("%s mode %d fd %d", name, mode, fd);
1.37 reyk 1380:
1.99 sthen 1381: /* Bring interface up if it is not already */
1382: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1383: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1384: goto failed;
1385:
1.98 djm 1386: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1.155 djm 1387: debug_f("get interface %s flags: %s", ifr.ifr_name,
1388: strerror(errno));
1.37 reyk 1389: goto failed;
1.98 djm 1390: }
1.40 reyk 1391:
1.98 djm 1392: if (!(ifr.ifr_flags & IFF_UP)) {
1393: ifr.ifr_flags |= IFF_UP;
1394: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1.155 djm 1395: debug_f("activate interface %s: %s", ifr.ifr_name,
1396: strerror(errno));
1.98 djm 1397: goto failed;
1398: }
1399: }
1.115 djm 1400:
1401: if (ifname != NULL)
1402: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1403:
1404: close(sock);
1.98 djm 1405: return fd;
1.37 reyk 1406:
1407: failed:
1408: if (fd >= 0)
1409: close(fd);
1410: if (sock >= 0)
1411: close(sock);
1.98 djm 1412: return -1;
1.35 djm 1413: }
1414:
1415: void
1416: sanitise_stdfd(void)
1417: {
1.41 djm 1418: int nullfd, dupfd;
1.35 djm 1419:
1.41 djm 1420: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1421: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1422: strerror(errno));
1.35 djm 1423: exit(1);
1424: }
1.103 krw 1425: while (++dupfd <= STDERR_FILENO) {
1426: /* Only populate closed fds. */
1427: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1428: if (dup2(nullfd, dupfd) == -1) {
1429: fprintf(stderr, "dup2: %s\n", strerror(errno));
1430: exit(1);
1431: }
1.35 djm 1432: }
1433: }
1.103 krw 1434: if (nullfd > STDERR_FILENO)
1.35 djm 1435: close(nullfd);
1.1 markus 1436: }
1.33 djm 1437:
1438: char *
1.52 djm 1439: tohex(const void *vp, size_t l)
1.33 djm 1440: {
1.52 djm 1441: const u_char *p = (const u_char *)vp;
1.33 djm 1442: char b[3], *r;
1.52 djm 1443: size_t i, hl;
1444:
1445: if (l > 65536)
1446: return xstrdup("tohex: length > 65536");
1.33 djm 1447:
1448: hl = l * 2 + 1;
1.49 djm 1449: r = xcalloc(1, hl);
1.33 djm 1450: for (i = 0; i < l; i++) {
1.52 djm 1451: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1452: strlcat(r, b, hl);
1453: }
1454: return (r);
1455: }
1.145 djm 1456:
1457: /*
1458: * Extend string *sp by the specified format. If *sp is not NULL (or empty),
1459: * then the separator 'sep' will be prepended before the formatted arguments.
1460: * Extended strings are heap allocated.
1461: */
1462: void
1463: xextendf(char **sp, const char *sep, const char *fmt, ...)
1464: {
1465: va_list ap;
1466: char *tmp1, *tmp2;
1467:
1468: va_start(ap, fmt);
1469: xvasprintf(&tmp1, fmt, ap);
1470: va_end(ap);
1471:
1472: if (*sp == NULL || **sp == '\0') {
1473: free(*sp);
1474: *sp = tmp1;
1475: return;
1476: }
1477: xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1);
1478: free(tmp1);
1479: free(*sp);
1480: *sp = tmp2;
1481: }
1482:
1.33 djm 1483:
1.52 djm 1484: u_int64_t
1485: get_u64(const void *vp)
1486: {
1487: const u_char *p = (const u_char *)vp;
1488: u_int64_t v;
1489:
1490: v = (u_int64_t)p[0] << 56;
1491: v |= (u_int64_t)p[1] << 48;
1492: v |= (u_int64_t)p[2] << 40;
1493: v |= (u_int64_t)p[3] << 32;
1494: v |= (u_int64_t)p[4] << 24;
1495: v |= (u_int64_t)p[5] << 16;
1496: v |= (u_int64_t)p[6] << 8;
1497: v |= (u_int64_t)p[7];
1498:
1499: return (v);
1500: }
1501:
1502: u_int32_t
1503: get_u32(const void *vp)
1504: {
1505: const u_char *p = (const u_char *)vp;
1506: u_int32_t v;
1507:
1508: v = (u_int32_t)p[0] << 24;
1509: v |= (u_int32_t)p[1] << 16;
1510: v |= (u_int32_t)p[2] << 8;
1511: v |= (u_int32_t)p[3];
1512:
1513: return (v);
1514: }
1515:
1.93 djm 1516: u_int32_t
1517: get_u32_le(const void *vp)
1518: {
1519: const u_char *p = (const u_char *)vp;
1520: u_int32_t v;
1521:
1522: v = (u_int32_t)p[0];
1523: v |= (u_int32_t)p[1] << 8;
1524: v |= (u_int32_t)p[2] << 16;
1525: v |= (u_int32_t)p[3] << 24;
1526:
1527: return (v);
1528: }
1529:
1.52 djm 1530: u_int16_t
1531: get_u16(const void *vp)
1532: {
1533: const u_char *p = (const u_char *)vp;
1534: u_int16_t v;
1535:
1536: v = (u_int16_t)p[0] << 8;
1537: v |= (u_int16_t)p[1];
1538:
1539: return (v);
1540: }
1541:
1542: void
1543: put_u64(void *vp, u_int64_t v)
1544: {
1545: u_char *p = (u_char *)vp;
1546:
1547: p[0] = (u_char)(v >> 56) & 0xff;
1548: p[1] = (u_char)(v >> 48) & 0xff;
1549: p[2] = (u_char)(v >> 40) & 0xff;
1550: p[3] = (u_char)(v >> 32) & 0xff;
1551: p[4] = (u_char)(v >> 24) & 0xff;
1552: p[5] = (u_char)(v >> 16) & 0xff;
1553: p[6] = (u_char)(v >> 8) & 0xff;
1554: p[7] = (u_char)v & 0xff;
1555: }
1556:
1557: void
1558: put_u32(void *vp, u_int32_t v)
1559: {
1560: u_char *p = (u_char *)vp;
1561:
1562: p[0] = (u_char)(v >> 24) & 0xff;
1563: p[1] = (u_char)(v >> 16) & 0xff;
1564: p[2] = (u_char)(v >> 8) & 0xff;
1565: p[3] = (u_char)v & 0xff;
1566: }
1567:
1.93 djm 1568: void
1569: put_u32_le(void *vp, u_int32_t v)
1570: {
1571: u_char *p = (u_char *)vp;
1572:
1573: p[0] = (u_char)v & 0xff;
1574: p[1] = (u_char)(v >> 8) & 0xff;
1575: p[2] = (u_char)(v >> 16) & 0xff;
1576: p[3] = (u_char)(v >> 24) & 0xff;
1577: }
1.52 djm 1578:
1579: void
1580: put_u16(void *vp, u_int16_t v)
1581: {
1582: u_char *p = (u_char *)vp;
1583:
1584: p[0] = (u_char)(v >> 8) & 0xff;
1585: p[1] = (u_char)v & 0xff;
1586: }
1.68 dtucker 1587:
1588: void
1589: ms_subtract_diff(struct timeval *start, int *ms)
1590: {
1591: struct timeval diff, finish;
1592:
1.119 dtucker 1593: monotime_tv(&finish);
1594: timersub(&finish, start, &diff);
1.68 dtucker 1595: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1596: }
1597:
1598: void
1.171 deraadt 1599: ms_to_timespec(struct timespec *ts, int ms)
1.68 dtucker 1600: {
1601: if (ms < 0)
1602: ms = 0;
1.171 deraadt 1603: ts->tv_sec = ms / 1000;
1604: ts->tv_nsec = (ms % 1000) * 1000 * 1000;
1.90 dtucker 1605: }
1606:
1.119 dtucker 1607: void
1608: monotime_ts(struct timespec *ts)
1609: {
1610: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1611: fatal("clock_gettime: %s", strerror(errno));
1612: }
1613:
1614: void
1615: monotime_tv(struct timeval *tv)
1616: {
1617: struct timespec ts;
1618:
1619: monotime_ts(&ts);
1620: tv->tv_sec = ts.tv_sec;
1621: tv->tv_usec = ts.tv_nsec / 1000;
1622: }
1623:
1.90 dtucker 1624: time_t
1625: monotime(void)
1626: {
1627: struct timespec ts;
1628:
1.119 dtucker 1629: monotime_ts(&ts);
1.90 dtucker 1630: return (ts.tv_sec);
1.102 dtucker 1631: }
1632:
1633: double
1634: monotime_double(void)
1635: {
1636: struct timespec ts;
1637:
1.119 dtucker 1638: monotime_ts(&ts);
1639: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1640: }
1641:
1642: void
1643: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1644: {
1645: bw->buflen = buflen;
1646: bw->rate = kbps;
1.135 dtucker 1647: bw->thresh = buflen;
1.81 djm 1648: bw->lamt = 0;
1649: timerclear(&bw->bwstart);
1650: timerclear(&bw->bwend);
1.135 dtucker 1651: }
1.81 djm 1652:
1653: /* Callback from read/write loop to insert bandwidth-limiting delays */
1654: void
1655: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1656: {
1657: u_int64_t waitlen;
1658: struct timespec ts, rm;
1659:
1.135 dtucker 1660: bw->lamt += read_len;
1.81 djm 1661: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1662: monotime_tv(&bw->bwstart);
1.81 djm 1663: return;
1664: }
1665: if (bw->lamt < bw->thresh)
1666: return;
1667:
1.119 dtucker 1668: monotime_tv(&bw->bwend);
1.81 djm 1669: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1670: if (!timerisset(&bw->bwend))
1671: return;
1672:
1673: bw->lamt *= 8;
1674: waitlen = (double)1000000L * bw->lamt / bw->rate;
1675:
1676: bw->bwstart.tv_sec = waitlen / 1000000L;
1677: bw->bwstart.tv_usec = waitlen % 1000000L;
1678:
1679: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1680: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1681:
1682: /* Adjust the wait time */
1683: if (bw->bwend.tv_sec) {
1684: bw->thresh /= 2;
1685: if (bw->thresh < bw->buflen / 4)
1686: bw->thresh = bw->buflen / 4;
1687: } else if (bw->bwend.tv_usec < 10000) {
1688: bw->thresh *= 2;
1689: if (bw->thresh > bw->buflen * 8)
1690: bw->thresh = bw->buflen * 8;
1691: }
1692:
1693: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1694: while (nanosleep(&ts, &rm) == -1) {
1695: if (errno != EINTR)
1696: break;
1697: ts = rm;
1698: }
1699: }
1700:
1701: bw->lamt = 0;
1.119 dtucker 1702: monotime_tv(&bw->bwstart);
1.84 djm 1703: }
1704:
1705: /* Make a template filename for mk[sd]temp() */
1706: void
1707: mktemp_proto(char *s, size_t len)
1708: {
1709: const char *tmpdir;
1710: int r;
1711:
1712: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1713: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1714: if (r > 0 && (size_t)r < len)
1715: return;
1716: }
1717: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1718: if (r < 0 || (size_t)r >= len)
1.155 djm 1719: fatal_f("template string too short");
1.68 dtucker 1720: }
1.83 djm 1721:
1722: static const struct {
1723: const char *name;
1724: int value;
1725: } ipqos[] = {
1.111 djm 1726: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1727: { "af11", IPTOS_DSCP_AF11 },
1728: { "af12", IPTOS_DSCP_AF12 },
1729: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1730: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1731: { "af22", IPTOS_DSCP_AF22 },
1732: { "af23", IPTOS_DSCP_AF23 },
1733: { "af31", IPTOS_DSCP_AF31 },
1734: { "af32", IPTOS_DSCP_AF32 },
1735: { "af33", IPTOS_DSCP_AF33 },
1736: { "af41", IPTOS_DSCP_AF41 },
1737: { "af42", IPTOS_DSCP_AF42 },
1738: { "af43", IPTOS_DSCP_AF43 },
1739: { "cs0", IPTOS_DSCP_CS0 },
1740: { "cs1", IPTOS_DSCP_CS1 },
1741: { "cs2", IPTOS_DSCP_CS2 },
1742: { "cs3", IPTOS_DSCP_CS3 },
1743: { "cs4", IPTOS_DSCP_CS4 },
1744: { "cs5", IPTOS_DSCP_CS5 },
1745: { "cs6", IPTOS_DSCP_CS6 },
1746: { "cs7", IPTOS_DSCP_CS7 },
1747: { "ef", IPTOS_DSCP_EF },
1.146 djm 1748: { "le", IPTOS_DSCP_LE },
1.83 djm 1749: { "lowdelay", IPTOS_LOWDELAY },
1750: { "throughput", IPTOS_THROUGHPUT },
1751: { "reliability", IPTOS_RELIABILITY },
1752: { NULL, -1 }
1753: };
1754:
1755: int
1756: parse_ipqos(const char *cp)
1757: {
1758: u_int i;
1759: char *ep;
1760: long val;
1761:
1762: if (cp == NULL)
1763: return -1;
1764: for (i = 0; ipqos[i].name != NULL; i++) {
1765: if (strcasecmp(cp, ipqos[i].name) == 0)
1766: return ipqos[i].value;
1767: }
1768: /* Try parsing as an integer */
1769: val = strtol(cp, &ep, 0);
1770: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1771: return -1;
1772: return val;
1773: }
1774:
1.85 stevesk 1775: const char *
1776: iptos2str(int iptos)
1777: {
1778: int i;
1779: static char iptos_str[sizeof "0xff"];
1780:
1781: for (i = 0; ipqos[i].name != NULL; i++) {
1782: if (ipqos[i].value == iptos)
1783: return ipqos[i].name;
1784: }
1785: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1786: return iptos_str;
1.92 djm 1787: }
1788:
1789: void
1790: lowercase(char *s)
1791: {
1792: for (; *s; s++)
1793: *s = tolower((u_char)*s);
1.94 millert 1794: }
1795:
1796: int
1797: unix_listener(const char *path, int backlog, int unlink_first)
1798: {
1799: struct sockaddr_un sunaddr;
1800: int saved_errno, sock;
1801:
1802: memset(&sunaddr, 0, sizeof(sunaddr));
1803: sunaddr.sun_family = AF_UNIX;
1.121 djm 1804: if (strlcpy(sunaddr.sun_path, path,
1805: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1.155 djm 1806: error_f("path \"%s\" too long for Unix domain socket", path);
1.94 millert 1807: errno = ENAMETOOLONG;
1808: return -1;
1809: }
1810:
1811: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1.139 deraadt 1812: if (sock == -1) {
1.94 millert 1813: saved_errno = errno;
1.155 djm 1814: error_f("socket: %.100s", strerror(errno));
1.94 millert 1815: errno = saved_errno;
1816: return -1;
1817: }
1818: if (unlink_first == 1) {
1819: if (unlink(path) != 0 && errno != ENOENT)
1820: error("unlink(%s): %.100s", path, strerror(errno));
1821: }
1.139 deraadt 1822: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 millert 1823: saved_errno = errno;
1.155 djm 1824: error_f("cannot bind to path %s: %s", path, strerror(errno));
1.122 djm 1825: close(sock);
1.94 millert 1826: errno = saved_errno;
1827: return -1;
1828: }
1.139 deraadt 1829: if (listen(sock, backlog) == -1) {
1.94 millert 1830: saved_errno = errno;
1.155 djm 1831: error_f("cannot listen on path %s: %s", path, strerror(errno));
1.94 millert 1832: close(sock);
1833: unlink(path);
1834: errno = saved_errno;
1835: return -1;
1836: }
1837: return sock;
1.85 stevesk 1838: }
1.104 djm 1839:
1840: /*
1841: * Compares two strings that maybe be NULL. Returns non-zero if strings
1842: * are both NULL or are identical, returns zero otherwise.
1843: */
1844: static int
1845: strcmp_maybe_null(const char *a, const char *b)
1846: {
1847: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1848: return 0;
1849: if (a != NULL && strcmp(a, b) != 0)
1850: return 0;
1851: return 1;
1852: }
1853:
1854: /*
1855: * Compare two forwards, returning non-zero if they are identical or
1856: * zero otherwise.
1857: */
1858: int
1859: forward_equals(const struct Forward *a, const struct Forward *b)
1860: {
1861: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1862: return 0;
1863: if (a->listen_port != b->listen_port)
1864: return 0;
1865: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1866: return 0;
1867: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1868: return 0;
1869: if (a->connect_port != b->connect_port)
1870: return 0;
1871: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1872: return 0;
1873: /* allocated_port and handle are not checked */
1.107 dtucker 1874: return 1;
1875: }
1876:
1877: /* returns 1 if process is already daemonized, 0 otherwise */
1878: int
1879: daemonized(void)
1880: {
1881: int fd;
1882:
1883: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1884: close(fd);
1885: return 0; /* have controlling terminal */
1886: }
1887: if (getppid() != 1)
1888: return 0; /* parent is not init */
1889: if (getsid(0) != getpid())
1890: return 0; /* not session leader */
1891: debug3("already daemonized");
1.106 dtucker 1892: return 1;
1893: }
1.112 djm 1894:
1895: /*
1896: * Splits 's' into an argument vector. Handles quoted string and basic
1897: * escape characters (\\, \", \'). Caller must free the argument vector
1898: * and its members.
1899: */
1900: int
1.166 djm 1901: argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment)
1.112 djm 1902: {
1903: int r = SSH_ERR_INTERNAL_ERROR;
1904: int argc = 0, quote, i, j;
1905: char *arg, **argv = xcalloc(1, sizeof(*argv));
1906:
1907: *argvp = NULL;
1908: *argcp = 0;
1909:
1910: for (i = 0; s[i] != '\0'; i++) {
1911: /* Skip leading whitespace */
1912: if (s[i] == ' ' || s[i] == '\t')
1913: continue;
1.166 djm 1914: if (terminate_on_comment && s[i] == '#')
1915: break;
1.112 djm 1916: /* Start of a token */
1917: quote = 0;
1918:
1919: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1920: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1921: argv[argc] = NULL;
1922:
1923: /* Copy the token in, removing escapes */
1924: for (j = 0; s[i] != '\0'; i++) {
1925: if (s[i] == '\\') {
1926: if (s[i + 1] == '\'' ||
1927: s[i + 1] == '\"' ||
1.166 djm 1928: s[i + 1] == '\\' ||
1929: (quote == 0 && s[i + 1] == ' ')) {
1.112 djm 1930: i++; /* Skip '\' */
1931: arg[j++] = s[i];
1932: } else {
1933: /* Unrecognised escape */
1934: arg[j++] = s[i];
1935: }
1936: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1937: break; /* done */
1.163 djm 1938: else if (quote == 0 && (s[i] == '\"' || s[i] == '\''))
1939: quote = s[i]; /* quote start */
1.112 djm 1940: else if (quote != 0 && s[i] == quote)
1.163 djm 1941: quote = 0; /* quote end */
1.112 djm 1942: else
1943: arg[j++] = s[i];
1944: }
1945: if (s[i] == '\0') {
1946: if (quote != 0) {
1947: /* Ran out of string looking for close quote */
1948: r = SSH_ERR_INVALID_FORMAT;
1949: goto out;
1950: }
1951: break;
1952: }
1953: }
1954: /* Success */
1955: *argcp = argc;
1956: *argvp = argv;
1957: argc = 0;
1958: argv = NULL;
1959: r = 0;
1960: out:
1961: if (argc != 0 && argv != NULL) {
1962: for (i = 0; i < argc; i++)
1963: free(argv[i]);
1964: free(argv);
1965: }
1966: return r;
1967: }
1968:
1969: /*
1970: * Reassemble an argument vector into a string, quoting and escaping as
1971: * necessary. Caller must free returned string.
1972: */
1973: char *
1974: argv_assemble(int argc, char **argv)
1975: {
1976: int i, j, ws, r;
1977: char c, *ret;
1978: struct sshbuf *buf, *arg;
1979:
1980: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1.155 djm 1981: fatal_f("sshbuf_new failed");
1.112 djm 1982:
1983: for (i = 0; i < argc; i++) {
1984: ws = 0;
1985: sshbuf_reset(arg);
1986: for (j = 0; argv[i][j] != '\0'; j++) {
1987: r = 0;
1988: c = argv[i][j];
1989: switch (c) {
1990: case ' ':
1991: case '\t':
1992: ws = 1;
1993: r = sshbuf_put_u8(arg, c);
1994: break;
1995: case '\\':
1996: case '\'':
1997: case '"':
1998: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1999: break;
2000: /* FALLTHROUGH */
2001: default:
2002: r = sshbuf_put_u8(arg, c);
2003: break;
2004: }
2005: if (r != 0)
1.155 djm 2006: fatal_fr(r, "sshbuf_put_u8");
1.112 djm 2007: }
2008: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
2009: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
2010: (r = sshbuf_putb(buf, arg)) != 0 ||
2011: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1.155 djm 2012: fatal_fr(r, "assemble");
1.112 djm 2013: }
2014: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1.155 djm 2015: fatal_f("malloc failed");
1.112 djm 2016: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
2017: ret[sshbuf_len(buf)] = '\0';
2018: sshbuf_free(buf);
2019: sshbuf_free(arg);
2020: return ret;
1.166 djm 2021: }
2022:
2023: char *
2024: argv_next(int *argcp, char ***argvp)
2025: {
2026: char *ret = (*argvp)[0];
2027:
2028: if (*argcp > 0 && ret != NULL) {
2029: (*argcp)--;
2030: (*argvp)++;
2031: }
2032: return ret;
2033: }
2034:
2035: void
2036: argv_consume(int *argcp)
2037: {
2038: *argcp = 0;
2039: }
2040:
2041: void
2042: argv_free(char **av, int ac)
2043: {
2044: int i;
2045:
2046: if (av == NULL)
2047: return;
2048: for (i = 0; i < ac; i++)
2049: free(av[i]);
2050: free(av);
1.112 djm 2051: }
2052:
2053: /* Returns 0 if pid exited cleanly, non-zero otherwise */
2054: int
1.113 djm 2055: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 2056: {
2057: int status;
2058:
2059: while (waitpid(pid, &status, 0) == -1) {
2060: if (errno != EINTR) {
1.155 djm 2061: error("%s waitpid: %s", tag, strerror(errno));
1.112 djm 2062: return -1;
2063: }
2064: }
2065: if (WIFSIGNALED(status)) {
2066: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
2067: return -1;
2068: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 2069: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
2070: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 2071: return -1;
2072: }
2073: return 0;
2074: }
2075:
2076: /*
2077: * Check a given path for security. This is defined as all components
2078: * of the path to the file must be owned by either the owner of
2079: * of the file or root and no directories must be group or world writable.
2080: *
2081: * XXX Should any specific check be done for sym links ?
2082: *
2083: * Takes a file name, its stat information (preferably from fstat() to
2084: * avoid races), the uid of the expected owner, their home directory and an
2085: * error buffer plus max size as arguments.
2086: *
2087: * Returns 0 on success and -1 on failure
2088: */
2089: int
2090: safe_path(const char *name, struct stat *stp, const char *pw_dir,
2091: uid_t uid, char *err, size_t errlen)
2092: {
2093: char buf[PATH_MAX], homedir[PATH_MAX];
2094: char *cp;
2095: int comparehome = 0;
2096: struct stat st;
2097:
2098: if (realpath(name, buf) == NULL) {
2099: snprintf(err, errlen, "realpath %s failed: %s", name,
2100: strerror(errno));
2101: return -1;
2102: }
2103: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
2104: comparehome = 1;
2105:
2106: if (!S_ISREG(stp->st_mode)) {
2107: snprintf(err, errlen, "%s is not a regular file", buf);
2108: return -1;
2109: }
2110: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
2111: (stp->st_mode & 022) != 0) {
2112: snprintf(err, errlen, "bad ownership or modes for file %s",
2113: buf);
2114: return -1;
2115: }
2116:
2117: /* for each component of the canonical path, walking upwards */
2118: for (;;) {
2119: if ((cp = dirname(buf)) == NULL) {
2120: snprintf(err, errlen, "dirname() failed");
2121: return -1;
2122: }
2123: strlcpy(buf, cp, sizeof(buf));
2124:
1.139 deraadt 2125: if (stat(buf, &st) == -1 ||
1.112 djm 2126: (st.st_uid != 0 && st.st_uid != uid) ||
2127: (st.st_mode & 022) != 0) {
2128: snprintf(err, errlen,
2129: "bad ownership or modes for directory %s", buf);
2130: return -1;
2131: }
2132:
2133: /* If are past the homedir then we can stop */
2134: if (comparehome && strcmp(homedir, buf) == 0)
2135: break;
2136:
2137: /*
2138: * dirname should always complete with a "/" path,
2139: * but we can be paranoid and check for "." too
2140: */
2141: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
2142: break;
2143: }
2144: return 0;
2145: }
2146:
2147: /*
2148: * Version of safe_path() that accepts an open file descriptor to
2149: * avoid races.
2150: *
2151: * Returns 0 on success and -1 on failure
2152: */
2153: int
2154: safe_path_fd(int fd, const char *file, struct passwd *pw,
2155: char *err, size_t errlen)
2156: {
2157: struct stat st;
2158:
2159: /* check the open file to avoid races */
1.139 deraadt 2160: if (fstat(fd, &st) == -1) {
1.112 djm 2161: snprintf(err, errlen, "cannot stat file %s: %s",
2162: file, strerror(errno));
2163: return -1;
2164: }
2165: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
2166: }
2167:
2168: /*
2169: * Sets the value of the given variable in the environment. If the variable
2170: * already exists, its value is overridden.
2171: */
2172: void
2173: child_set_env(char ***envp, u_int *envsizep, const char *name,
2174: const char *value)
2175: {
2176: char **env;
2177: u_int envsize;
2178: u_int i, namelen;
2179:
2180: if (strchr(name, '=') != NULL) {
2181: error("Invalid environment variable \"%.100s\"", name);
2182: return;
2183: }
2184:
2185: /*
2186: * Find the slot where the value should be stored. If the variable
2187: * already exists, we reuse the slot; otherwise we append a new slot
2188: * at the end of the array, expanding if necessary.
2189: */
2190: env = *envp;
2191: namelen = strlen(name);
2192: for (i = 0; env[i]; i++)
2193: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
2194: break;
2195: if (env[i]) {
2196: /* Reuse the slot. */
2197: free(env[i]);
2198: } else {
2199: /* New variable. Expand if necessary. */
2200: envsize = *envsizep;
2201: if (i >= envsize - 1) {
2202: if (envsize >= 1000)
2203: fatal("child_set_env: too many env vars");
2204: envsize += 50;
2205: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
2206: *envsizep = envsize;
2207: }
2208: /* Need to set the NULL pointer at end of array beyond the new slot. */
2209: env[i + 1] = NULL;
2210: }
2211:
2212: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 2213: /* XXX xasprintf */
1.112 djm 2214: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
2215: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
2216: }
2217:
1.114 millert 2218: /*
2219: * Check and optionally lowercase a domain name, also removes trailing '.'
2220: * Returns 1 on success and 0 on failure, storing an error message in errstr.
2221: */
2222: int
2223: valid_domain(char *name, int makelower, const char **errstr)
2224: {
2225: size_t i, l = strlen(name);
2226: u_char c, last = '\0';
2227: static char errbuf[256];
2228:
2229: if (l == 0) {
2230: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
2231: goto bad;
2232: }
2233: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
2234: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
2235: "starts with invalid character", name);
2236: goto bad;
2237: }
2238: for (i = 0; i < l; i++) {
2239: c = tolower((u_char)name[i]);
2240: if (makelower)
2241: name[i] = (char)c;
2242: if (last == '.' && c == '.') {
2243: snprintf(errbuf, sizeof(errbuf), "domain name "
2244: "\"%.100s\" contains consecutive separators", name);
2245: goto bad;
2246: }
2247: if (c != '.' && c != '-' && !isalnum(c) &&
2248: c != '_') /* technically invalid, but common */ {
2249: snprintf(errbuf, sizeof(errbuf), "domain name "
2250: "\"%.100s\" contains invalid characters", name);
2251: goto bad;
2252: }
2253: last = c;
2254: }
2255: if (name[l - 1] == '.')
2256: name[l - 1] = '\0';
2257: if (errstr != NULL)
2258: *errstr = NULL;
2259: return 1;
2260: bad:
2261: if (errstr != NULL)
2262: *errstr = errbuf;
2263: return 0;
1.132 djm 2264: }
2265:
2266: /*
2267: * Verify that a environment variable name (not including initial '$') is
2268: * valid; consisting of one or more alphanumeric or underscore characters only.
2269: * Returns 1 on valid, 0 otherwise.
2270: */
2271: int
2272: valid_env_name(const char *name)
2273: {
2274: const char *cp;
2275:
2276: if (name[0] == '\0')
2277: return 0;
2278: for (cp = name; *cp != '\0'; cp++) {
2279: if (!isalnum((u_char)*cp) && *cp != '_')
2280: return 0;
2281: }
2282: return 1;
1.120 dtucker 2283: }
2284:
2285: const char *
2286: atoi_err(const char *nptr, int *val)
2287: {
2288: const char *errstr = NULL;
2289: long long num;
2290:
2291: if (nptr == NULL || *nptr == '\0')
2292: return "missing";
2293: num = strtonum(nptr, 0, INT_MAX, &errstr);
2294: if (errstr == NULL)
2295: *val = (int)num;
2296: return errstr;
1.127 djm 2297: }
2298:
2299: int
2300: parse_absolute_time(const char *s, uint64_t *tp)
2301: {
2302: struct tm tm;
2303: time_t tt;
2304: char buf[32], *fmt;
1.177 djm 2305: const char *cp;
2306: size_t l;
2307: int is_utc = 0;
1.127 djm 2308:
2309: *tp = 0;
2310:
1.177 djm 2311: l = strlen(s);
2312: if (l > 1 && strcasecmp(s + l - 1, "Z") == 0) {
2313: is_utc = 1;
2314: l--;
2315: } else if (l > 3 && strcasecmp(s + l - 3, "UTC") == 0) {
2316: is_utc = 1;
2317: l -= 3;
2318: }
1.127 djm 2319: /*
2320: * POSIX strptime says "The application shall ensure that there
2321: * is white-space or other non-alphanumeric characters between
2322: * any two conversion specifications" so arrange things this way.
2323: */
1.177 djm 2324: switch (l) {
1.127 djm 2325: case 8: /* YYYYMMDD */
2326: fmt = "%Y-%m-%d";
2327: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
2328: break;
2329: case 12: /* YYYYMMDDHHMM */
2330: fmt = "%Y-%m-%dT%H:%M";
2331: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
2332: s, s + 4, s + 6, s + 8, s + 10);
2333: break;
2334: case 14: /* YYYYMMDDHHMMSS */
2335: fmt = "%Y-%m-%dT%H:%M:%S";
2336: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
2337: s, s + 4, s + 6, s + 8, s + 10, s + 12);
2338: break;
2339: default:
2340: return SSH_ERR_INVALID_FORMAT;
2341: }
2342:
2343: memset(&tm, 0, sizeof(tm));
1.177 djm 2344: if ((cp = strptime(buf, fmt, &tm)) == NULL || *cp != '\0')
1.127 djm 2345: return SSH_ERR_INVALID_FORMAT;
1.177 djm 2346: if (is_utc) {
2347: if ((tt = timegm(&tm)) < 0)
2348: return SSH_ERR_INVALID_FORMAT;
2349: } else {
2350: if ((tt = mktime(&tm)) < 0)
2351: return SSH_ERR_INVALID_FORMAT;
2352: }
1.127 djm 2353: /* success */
2354: *tp = (uint64_t)tt;
2355: return 0;
2356: }
1.167 dtucker 2357:
1.127 djm 2358: void
2359: format_absolute_time(uint64_t t, char *buf, size_t len)
2360: {
1.167 dtucker 2361: time_t tt = t > SSH_TIME_T_MAX ? SSH_TIME_T_MAX : t;
1.127 djm 2362: struct tm tm;
2363:
2364: localtime_r(&tt, &tm);
2365: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.134 djm 2366: }
2367:
2368: /* check if path is absolute */
2369: int
2370: path_absolute(const char *path)
2371: {
2372: return (*path == '/') ? 1 : 0;
1.141 djm 2373: }
2374:
2375: void
2376: skip_space(char **cpp)
2377: {
2378: char *cp;
2379:
2380: for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
2381: ;
2382: *cpp = cp;
1.114 millert 2383: }
1.142 djm 2384:
2385: /* authorized_key-style options parsing helpers */
2386:
2387: /*
2388: * Match flag 'opt' in *optsp, and if allow_negate is set then also match
2389: * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
2390: * if negated option matches.
2391: * If the option or negated option matches, then *optsp is updated to
2392: * point to the first character after the option.
2393: */
2394: int
2395: opt_flag(const char *opt, int allow_negate, const char **optsp)
2396: {
2397: size_t opt_len = strlen(opt);
2398: const char *opts = *optsp;
2399: int negate = 0;
2400:
2401: if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
2402: opts += 3;
2403: negate = 1;
2404: }
2405: if (strncasecmp(opts, opt, opt_len) == 0) {
2406: *optsp = opts + opt_len;
2407: return negate ? 0 : 1;
2408: }
2409: return -1;
2410: }
2411:
2412: char *
2413: opt_dequote(const char **sp, const char **errstrp)
2414: {
2415: const char *s = *sp;
2416: char *ret;
2417: size_t i;
2418:
2419: *errstrp = NULL;
2420: if (*s != '"') {
2421: *errstrp = "missing start quote";
2422: return NULL;
2423: }
2424: s++;
2425: if ((ret = malloc(strlen((s)) + 1)) == NULL) {
2426: *errstrp = "memory allocation failed";
2427: return NULL;
2428: }
2429: for (i = 0; *s != '\0' && *s != '"';) {
2430: if (s[0] == '\\' && s[1] == '"')
2431: s++;
2432: ret[i++] = *s++;
2433: }
2434: if (*s == '\0') {
2435: *errstrp = "missing end quote";
2436: free(ret);
2437: return NULL;
2438: }
2439: ret[i] = '\0';
2440: s++;
2441: *sp = s;
2442: return ret;
2443: }
2444:
2445: int
2446: opt_match(const char **opts, const char *term)
2447: {
2448: if (strncasecmp((*opts), term, strlen(term)) == 0 &&
2449: (*opts)[strlen(term)] == '=') {
2450: *opts += strlen(term) + 1;
2451: return 1;
2452: }
2453: return 0;
1.161 markus 2454: }
2455:
2456: void
2457: opt_array_append2(const char *file, const int line, const char *directive,
2458: char ***array, int **iarray, u_int *lp, const char *s, int i)
2459: {
2460:
2461: if (*lp >= INT_MAX)
2462: fatal("%s line %d: Too many %s entries", file, line, directive);
2463:
2464: if (iarray != NULL) {
2465: *iarray = xrecallocarray(*iarray, *lp, *lp + 1,
2466: sizeof(**iarray));
2467: (*iarray)[*lp] = i;
2468: }
2469:
2470: *array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array));
2471: (*array)[*lp] = xstrdup(s);
2472: (*lp)++;
2473: }
2474:
2475: void
2476: opt_array_append(const char *file, const int line, const char *directive,
2477: char ***array, u_int *lp, const char *s)
2478: {
2479: opt_array_append2(file, line, directive, array, NULL, lp, s, 0);
1.142 djm 2480: }
2481:
1.144 dtucker 2482: sshsig_t
2483: ssh_signal(int signum, sshsig_t handler)
2484: {
2485: struct sigaction sa, osa;
2486:
2487: /* mask all other signals while in handler */
1.147 dtucker 2488: memset(&sa, 0, sizeof(sa));
1.144 dtucker 2489: sa.sa_handler = handler;
2490: sigfillset(&sa.sa_mask);
2491: if (signum != SIGALRM)
2492: sa.sa_flags = SA_RESTART;
2493: if (sigaction(signum, &sa, &osa) == -1) {
2494: debug3("sigaction(%s): %s", strsignal(signum), strerror(errno));
2495: return SIG_ERR;
2496: }
2497: return osa.sa_handler;
1.154 djm 2498: }
2499:
2500: int
2501: stdfd_devnull(int do_stdin, int do_stdout, int do_stderr)
2502: {
2503: int devnull, ret = 0;
2504:
2505: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.155 djm 2506: error_f("open %s: %s", _PATH_DEVNULL,
1.154 djm 2507: strerror(errno));
2508: return -1;
2509: }
2510: if ((do_stdin && dup2(devnull, STDIN_FILENO) == -1) ||
2511: (do_stdout && dup2(devnull, STDOUT_FILENO) == -1) ||
2512: (do_stderr && dup2(devnull, STDERR_FILENO) == -1)) {
1.155 djm 2513: error_f("dup2: %s", strerror(errno));
1.154 djm 2514: ret = -1;
2515: }
2516: if (devnull > STDERR_FILENO)
2517: close(devnull);
2518: return ret;
1.157 djm 2519: }
2520:
2521: /*
2522: * Runs command in a subprocess with a minimal environment.
2523: * Returns pid on success, 0 on failure.
2524: * The child stdout and stderr maybe captured, left attached or sent to
2525: * /dev/null depending on the contents of flags.
2526: * "tag" is prepended to log messages.
2527: * NB. "command" is only used for logging; the actual command executed is
2528: * av[0].
2529: */
2530: pid_t
2531: subprocess(const char *tag, const char *command,
2532: int ac, char **av, FILE **child, u_int flags,
2533: struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs)
2534: {
2535: FILE *f = NULL;
2536: struct stat st;
2537: int fd, devnull, p[2], i;
2538: pid_t pid;
2539: char *cp, errmsg[512];
2540: u_int nenv = 0;
2541: char **env = NULL;
2542:
2543: /* If dropping privs, then must specify user and restore function */
2544: if (drop_privs != NULL && (pw == NULL || restore_privs == NULL)) {
2545: error("%s: inconsistent arguments", tag); /* XXX fatal? */
2546: return 0;
2547: }
2548: if (pw == NULL && (pw = getpwuid(getuid())) == NULL) {
2549: error("%s: no user for current uid", tag);
2550: return 0;
2551: }
2552: if (child != NULL)
2553: *child = NULL;
2554:
2555: debug3_f("%s command \"%s\" running as %s (flags 0x%x)",
2556: tag, command, pw->pw_name, flags);
2557:
2558: /* Check consistency */
2559: if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
2560: (flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) {
2561: error_f("inconsistent flags");
2562: return 0;
2563: }
2564: if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) != (child == NULL)) {
2565: error_f("inconsistent flags/output");
2566: return 0;
2567: }
2568:
2569: /*
2570: * If executing an explicit binary, then verify the it exists
2571: * and appears safe-ish to execute
2572: */
2573: if (!path_absolute(av[0])) {
2574: error("%s path is not absolute", tag);
2575: return 0;
2576: }
2577: if (drop_privs != NULL)
2578: drop_privs(pw);
2579: if (stat(av[0], &st) == -1) {
2580: error("Could not stat %s \"%s\": %s", tag,
2581: av[0], strerror(errno));
2582: goto restore_return;
2583: }
2584: if ((flags & SSH_SUBPROCESS_UNSAFE_PATH) == 0 &&
2585: safe_path(av[0], &st, NULL, 0, errmsg, sizeof(errmsg)) != 0) {
2586: error("Unsafe %s \"%s\": %s", tag, av[0], errmsg);
2587: goto restore_return;
2588: }
2589: /* Prepare to keep the child's stdout if requested */
2590: if (pipe(p) == -1) {
2591: error("%s: pipe: %s", tag, strerror(errno));
2592: restore_return:
2593: if (restore_privs != NULL)
2594: restore_privs();
2595: return 0;
2596: }
2597: if (restore_privs != NULL)
2598: restore_privs();
2599:
2600: switch ((pid = fork())) {
2601: case -1: /* error */
2602: error("%s: fork: %s", tag, strerror(errno));
2603: close(p[0]);
2604: close(p[1]);
2605: return 0;
2606: case 0: /* child */
2607: /* Prepare a minimal environment for the child. */
2608: if ((flags & SSH_SUBPROCESS_PRESERVE_ENV) == 0) {
2609: nenv = 5;
2610: env = xcalloc(sizeof(*env), nenv);
2611: child_set_env(&env, &nenv, "PATH", _PATH_STDPATH);
2612: child_set_env(&env, &nenv, "USER", pw->pw_name);
2613: child_set_env(&env, &nenv, "LOGNAME", pw->pw_name);
2614: child_set_env(&env, &nenv, "HOME", pw->pw_dir);
2615: if ((cp = getenv("LANG")) != NULL)
2616: child_set_env(&env, &nenv, "LANG", cp);
2617: }
2618:
1.162 dtucker 2619: for (i = 1; i < NSIG; i++)
1.157 djm 2620: ssh_signal(i, SIG_DFL);
2621:
2622: if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
2623: error("%s: open %s: %s", tag, _PATH_DEVNULL,
2624: strerror(errno));
2625: _exit(1);
2626: }
2627: if (dup2(devnull, STDIN_FILENO) == -1) {
2628: error("%s: dup2: %s", tag, strerror(errno));
2629: _exit(1);
2630: }
2631:
2632: /* Set up stdout as requested; leave stderr in place for now. */
2633: fd = -1;
2634: if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0)
2635: fd = p[1];
2636: else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0)
2637: fd = devnull;
2638: if (fd != -1 && dup2(fd, STDOUT_FILENO) == -1) {
2639: error("%s: dup2: %s", tag, strerror(errno));
2640: _exit(1);
2641: }
2642: closefrom(STDERR_FILENO + 1);
2643:
1.170 djm 2644: if (geteuid() == 0 &&
2645: initgroups(pw->pw_name, pw->pw_gid) == -1) {
2646: error("%s: initgroups(%s, %u): %s", tag,
2647: pw->pw_name, (u_int)pw->pw_gid, strerror(errno));
2648: _exit(1);
2649: }
1.157 djm 2650: if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) {
2651: error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
2652: strerror(errno));
2653: _exit(1);
2654: }
2655: if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) {
2656: error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,
2657: strerror(errno));
2658: _exit(1);
2659: }
2660: /* stdin is pointed to /dev/null at this point */
2661: if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
2662: dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
2663: error("%s: dup2: %s", tag, strerror(errno));
2664: _exit(1);
2665: }
2666: if (env != NULL)
2667: execve(av[0], av, env);
2668: else
2669: execv(av[0], av);
2670: error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve",
2671: command, strerror(errno));
2672: _exit(127);
2673: default: /* parent */
2674: break;
2675: }
2676:
2677: close(p[1]);
2678: if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0)
2679: close(p[0]);
2680: else if ((f = fdopen(p[0], "r")) == NULL) {
2681: error("%s: fdopen: %s", tag, strerror(errno));
2682: close(p[0]);
2683: /* Don't leave zombie child */
2684: kill(pid, SIGTERM);
2685: while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
2686: ;
2687: return 0;
2688: }
2689: /* Success */
2690: debug3_f("%s pid %ld", tag, (long)pid);
2691: if (child != NULL)
2692: *child = f;
2693: return pid;
1.165 djm 2694: }
2695:
2696: const char *
2697: lookup_env_in_list(const char *env, char * const *envs, size_t nenvs)
2698: {
2699: size_t i, envlen;
2700:
2701: envlen = strlen(env);
2702: for (i = 0; i < nenvs; i++) {
2703: if (strncmp(envs[i], env, envlen) == 0 &&
2704: envs[i][envlen] == '=') {
2705: return envs[i] + envlen + 1;
2706: }
2707: }
2708: return NULL;
1.176 djm 2709: }
2710:
2711: const char *
2712: lookup_setenv_in_list(const char *env, char * const *envs, size_t nenvs)
2713: {
2714: char *name, *cp;
2715: const char *ret;
2716:
2717: name = xstrdup(env);
2718: if ((cp = strchr(name, '=')) == NULL) {
2719: free(name);
2720: return NULL; /* not env=val */
2721: }
2722: *cp = '\0';
2723: ret = lookup_env_in_list(name, envs, nenvs);
2724: free(name);
2725: return ret;
1.180 djm 2726: }
2727:
2728: /*
2729: * Helpers for managing poll(2)/ppoll(2) timeouts
2730: * Will remember the earliest deadline and return it for use in poll/ppoll.
2731: */
2732:
2733: /* Initialise a poll/ppoll timeout with an indefinite deadline */
2734: void
2735: ptimeout_init(struct timespec *pt)
2736: {
2737: /*
2738: * Deliberately invalid for ppoll(2).
2739: * Will be converted to NULL in ptimeout_get_tspec() later.
2740: */
2741: pt->tv_sec = -1;
2742: pt->tv_nsec = 0;
2743: }
2744:
2745: /* Specify a poll/ppoll deadline of at most 'sec' seconds */
2746: void
2747: ptimeout_deadline_sec(struct timespec *pt, long sec)
2748: {
2749: if (pt->tv_sec == -1 || pt->tv_sec >= sec) {
2750: pt->tv_sec = sec;
2751: pt->tv_nsec = 0;
2752: }
2753: }
2754:
2755: /* Specify a poll/ppoll deadline of at most 'p' (timespec) */
2756: static void
2757: ptimeout_deadline_tsp(struct timespec *pt, struct timespec *p)
2758: {
2759: if (pt->tv_sec == -1 || timespeccmp(pt, p, >=))
2760: *pt = *p;
2761: }
2762:
2763: /* Specify a poll/ppoll deadline of at most 'ms' milliseconds */
2764: void
2765: ptimeout_deadline_ms(struct timespec *pt, long ms)
2766: {
2767: struct timespec p;
2768:
2769: p.tv_sec = ms / 1000;
2770: p.tv_nsec = (ms % 1000) * 1000000;
2771: ptimeout_deadline_tsp(pt, &p);
2772: }
2773:
2774: /* Specify a poll/ppoll deadline at wall clock monotime 'when' */
2775: void
2776: ptimeout_deadline_monotime(struct timespec *pt, time_t when)
2777: {
2778: struct timespec now, t;
2779:
2780: t.tv_sec = when;
2781: t.tv_nsec = 0;
2782: monotime_ts(&now);
2783:
2784: if (timespeccmp(&now, &t, >=))
2785: ptimeout_deadline_sec(pt, 0);
2786: else {
2787: timespecsub(&t, &now, &t);
2788: ptimeout_deadline_tsp(pt, &t);
2789: }
2790: }
2791:
2792: /* Get a poll(2) timeout value in milliseconds */
2793: int
2794: ptimeout_get_ms(struct timespec *pt)
2795: {
2796: if (pt->tv_sec == -1)
2797: return -1;
2798: if (pt->tv_sec >= (INT_MAX - (pt->tv_nsec / 1000000)) / 1000)
2799: return INT_MAX;
2800: return (pt->tv_sec * 1000) + (pt->tv_nsec / 1000000);
2801: }
2802:
2803: /* Get a ppoll(2) timeout value as a timespec pointer */
2804: struct timespec *
2805: ptimeout_get_tsp(struct timespec *pt)
2806: {
2807: return pt->tv_sec == -1 ? NULL : pt;
2808: }
2809:
2810: /* Returns non-zero if a timeout has been set (i.e. is not indefinite) */
2811: int
2812: ptimeout_isset(struct timespec *pt)
2813: {
2814: return pt->tv_sec != -1;
1.144 dtucker 2815: }
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