Annotation of src/usr.bin/ssh/misc.c, Revision 1.148
1.148 ! djm 1: /* $OpenBSD: misc.c,v 1.147 2020/04/25 06:59:36 dtucker Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.148 ! djm 4: * Copyright (c) 2005-2020 Damien Miller. All rights reserved.
! 5: * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
1.1 markus 6: *
1.148 ! djm 7: * Permission to use, copy, modify, and distribute this software for any
! 8: * purpose with or without fee is hereby granted, provided that the above
! 9: * copyright notice and this permission notice appear in all copies.
1.1 markus 10: *
1.148 ! djm 11: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 17: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 markus 18: */
19:
1.148 ! djm 20:
1.64 deraadt 21: #include <sys/types.h>
1.45 stevesk 22: #include <sys/ioctl.h>
1.53 stevesk 23: #include <sys/socket.h>
1.112 djm 24: #include <sys/stat.h>
1.101 dtucker 25: #include <sys/time.h>
1.112 djm 26: #include <sys/wait.h>
1.94 millert 27: #include <sys/un.h>
1.38 stevesk 28:
29: #include <net/if.h>
1.53 stevesk 30: #include <netinet/in.h>
1.83 djm 31: #include <netinet/ip.h>
1.44 stevesk 32: #include <netinet/tcp.h>
1.133 naddy 33: #include <arpa/inet.h>
1.43 stevesk 34:
1.92 djm 35: #include <ctype.h>
1.58 stevesk 36: #include <errno.h>
1.55 stevesk 37: #include <fcntl.h>
1.66 dtucker 38: #include <netdb.h>
1.43 stevesk 39: #include <paths.h>
1.54 stevesk 40: #include <pwd.h>
1.112 djm 41: #include <libgen.h>
1.96 deraadt 42: #include <limits.h>
1.136 djm 43: #include <poll.h>
1.112 djm 44: #include <signal.h>
1.57 stevesk 45: #include <stdarg.h>
1.63 stevesk 46: #include <stdio.h>
1.62 stevesk 47: #include <stdlib.h>
1.60 stevesk 48: #include <string.h>
1.59 stevesk 49: #include <unistd.h>
1.1 markus 50:
1.64 deraadt 51: #include "xmalloc.h"
1.1 markus 52: #include "misc.h"
53: #include "log.h"
1.56 dtucker 54: #include "ssh.h"
1.112 djm 55: #include "sshbuf.h"
56: #include "ssherr.h"
1.1 markus 57:
1.12 markus 58: /* remove newline at end of string */
1.1 markus 59: char *
60: chop(char *s)
61: {
62: char *t = s;
63: while (*t) {
1.13 deraadt 64: if (*t == '\n' || *t == '\r') {
1.1 markus 65: *t = '\0';
66: return s;
67: }
68: t++;
69: }
70: return s;
71:
72: }
73:
1.12 markus 74: /* set/unset filedescriptor to non-blocking */
1.24 djm 75: int
1.1 markus 76: set_nonblock(int fd)
77: {
78: int val;
1.8 markus 79:
1.103 krw 80: val = fcntl(fd, F_GETFL);
1.139 deraadt 81: if (val == -1) {
1.103 krw 82: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 83: return (-1);
1.1 markus 84: }
85: if (val & O_NONBLOCK) {
1.24 djm 86: debug3("fd %d is O_NONBLOCK", fd);
87: return (0);
1.1 markus 88: }
1.21 markus 89: debug2("fd %d setting O_NONBLOCK", fd);
1.1 markus 90: val |= O_NONBLOCK;
1.24 djm 91: if (fcntl(fd, F_SETFL, val) == -1) {
92: debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
93: strerror(errno));
94: return (-1);
95: }
96: return (0);
1.8 markus 97: }
98:
1.24 djm 99: int
1.8 markus 100: unset_nonblock(int fd)
101: {
102: int val;
103:
1.103 krw 104: val = fcntl(fd, F_GETFL);
1.139 deraadt 105: if (val == -1) {
1.103 krw 106: error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
1.24 djm 107: return (-1);
1.8 markus 108: }
109: if (!(val & O_NONBLOCK)) {
1.24 djm 110: debug3("fd %d is not O_NONBLOCK", fd);
111: return (0);
1.8 markus 112: }
1.10 markus 113: debug("fd %d clearing O_NONBLOCK", fd);
1.8 markus 114: val &= ~O_NONBLOCK;
1.24 djm 115: if (fcntl(fd, F_SETFL, val) == -1) {
116: debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
1.18 markus 117: fd, strerror(errno));
1.24 djm 118: return (-1);
119: }
120: return (0);
1.66 dtucker 121: }
122:
123: const char *
124: ssh_gai_strerror(int gaierr)
125: {
1.91 djm 126: if (gaierr == EAI_SYSTEM && errno != 0)
1.67 dtucker 127: return strerror(errno);
128: return gai_strerror(gaierr);
1.15 stevesk 129: }
130:
131: /* disable nagle on socket */
132: void
133: set_nodelay(int fd)
134: {
1.17 stevesk 135: int opt;
136: socklen_t optlen;
1.15 stevesk 137:
1.16 stevesk 138: optlen = sizeof opt;
139: if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
1.23 markus 140: debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
1.16 stevesk 141: return;
142: }
143: if (opt == 1) {
144: debug2("fd %d is TCP_NODELAY", fd);
145: return;
146: }
147: opt = 1;
1.20 markus 148: debug2("fd %d setting TCP_NODELAY", fd);
1.16 stevesk 149: if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
1.15 stevesk 150: error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
1.117 djm 151: }
152:
153: /* Allow local port reuse in TIME_WAIT */
154: int
155: set_reuseaddr(int fd)
156: {
157: int on = 1;
158:
159: if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
160: error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
161: return -1;
162: }
163: return 0;
164: }
165:
1.118 djm 166: /* Get/set routing domain */
167: char *
168: get_rdomain(int fd)
169: {
170: int rtable;
171: char *ret;
172: socklen_t len = sizeof(rtable);
173:
174: if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
175: error("Failed to get routing domain for fd %d: %s",
176: fd, strerror(errno));
177: return NULL;
178: }
179: xasprintf(&ret, "%d", rtable);
180: return ret;
181: }
182:
1.117 djm 183: int
184: set_rdomain(int fd, const char *name)
185: {
186: int rtable;
187: const char *errstr;
188:
189: if (name == NULL)
190: return 0; /* default table */
191:
192: rtable = (int)strtonum(name, 0, 255, &errstr);
193: if (errstr != NULL) {
194: /* Shouldn't happen */
195: error("Invalid routing domain \"%s\": %s", name, errstr);
196: return -1;
197: }
198: if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
199: &rtable, sizeof(rtable)) == -1) {
200: error("Failed to set routing domain %d on fd %d: %s",
201: rtable, fd, strerror(errno));
202: return -1;
203: }
1.136 djm 204: return 0;
205: }
206:
207: /*
1.143 dtucker 208: * Wait up to *timeoutp milliseconds for events on fd. Updates
1.136 djm 209: * *timeoutp with time remaining.
210: * Returns 0 if fd ready or -1 on timeout or error (see errno).
211: */
1.143 dtucker 212: static int
213: waitfd(int fd, int *timeoutp, short events)
1.136 djm 214: {
215: struct pollfd pfd;
216: struct timeval t_start;
217: int oerrno, r;
218:
219: monotime_tv(&t_start);
220: pfd.fd = fd;
1.143 dtucker 221: pfd.events = events;
1.136 djm 222: for (; *timeoutp >= 0;) {
223: r = poll(&pfd, 1, *timeoutp);
224: oerrno = errno;
225: ms_subtract_diff(&t_start, timeoutp);
226: errno = oerrno;
227: if (r > 0)
228: return 0;
229: else if (r == -1 && errno != EAGAIN)
230: return -1;
231: else if (r == 0)
232: break;
233: }
234: /* timeout */
235: errno = ETIMEDOUT;
236: return -1;
237: }
238:
239: /*
1.143 dtucker 240: * Wait up to *timeoutp milliseconds for fd to be readable. Updates
241: * *timeoutp with time remaining.
242: * Returns 0 if fd ready or -1 on timeout or error (see errno).
243: */
244: int
245: waitrfd(int fd, int *timeoutp) {
246: return waitfd(fd, timeoutp, POLLIN);
247: }
248:
249: /*
1.136 djm 250: * Attempt a non-blocking connect(2) to the specified address, waiting up to
251: * *timeoutp milliseconds for the connection to complete. If the timeout is
252: * <=0, then wait indefinitely.
253: *
254: * Returns 0 on success or -1 on failure.
255: */
256: int
257: timeout_connect(int sockfd, const struct sockaddr *serv_addr,
258: socklen_t addrlen, int *timeoutp)
259: {
260: int optval = 0;
261: socklen_t optlen = sizeof(optval);
262:
263: /* No timeout: just do a blocking connect() */
264: if (timeoutp == NULL || *timeoutp <= 0)
265: return connect(sockfd, serv_addr, addrlen);
266:
267: set_nonblock(sockfd);
268: if (connect(sockfd, serv_addr, addrlen) == 0) {
269: /* Succeeded already? */
270: unset_nonblock(sockfd);
271: return 0;
272: } else if (errno != EINPROGRESS)
273: return -1;
274:
1.143 dtucker 275: if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
1.136 djm 276: return -1;
277:
278: /* Completed or failed */
279: if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
280: debug("getsockopt: %s", strerror(errno));
281: return -1;
282: }
283: if (optval != 0) {
284: errno = optval;
285: return -1;
286: }
287: unset_nonblock(sockfd);
1.117 djm 288: return 0;
1.72 reyk 289: }
290:
1.1 markus 291: /* Characters considered whitespace in strsep calls. */
292: #define WHITESPACE " \t\r\n"
1.46 dtucker 293: #define QUOTE "\""
1.1 markus 294:
1.12 markus 295: /* return next token in configuration line */
1.129 djm 296: static char *
297: strdelim_internal(char **s, int split_equals)
1.1 markus 298: {
1.126 djm 299: char *old;
1.1 markus 300: int wspace = 0;
301:
302: if (*s == NULL)
303: return NULL;
304:
305: old = *s;
306:
1.129 djm 307: *s = strpbrk(*s,
308: split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
1.1 markus 309: if (*s == NULL)
310: return (old);
311:
1.46 dtucker 312: if (*s[0] == '\"') {
313: memmove(*s, *s + 1, strlen(*s)); /* move nul too */
314: /* Find matching quote */
1.126 djm 315: if ((*s = strpbrk(*s, QUOTE)) == NULL) {
316: return (NULL); /* no matching quote */
317: } else {
318: *s[0] = '\0';
319: *s += strspn(*s + 1, WHITESPACE) + 1;
320: return (old);
1.46 dtucker 321: }
322: }
323:
1.1 markus 324: /* Allow only one '=' to be skipped */
1.129 djm 325: if (split_equals && *s[0] == '=')
1.1 markus 326: wspace = 1;
327: *s[0] = '\0';
328:
1.46 dtucker 329: /* Skip any extra whitespace after first token */
1.1 markus 330: *s += strspn(*s + 1, WHITESPACE) + 1;
1.129 djm 331: if (split_equals && *s[0] == '=' && !wspace)
1.1 markus 332: *s += strspn(*s + 1, WHITESPACE) + 1;
333:
334: return (old);
1.129 djm 335: }
336:
337: /*
338: * Return next token in configuration line; splts on whitespace or a
339: * single '=' character.
340: */
341: char *
342: strdelim(char **s)
343: {
344: return strdelim_internal(s, 1);
345: }
346:
347: /*
348: * Return next token in configuration line; splts on whitespace only.
349: */
350: char *
351: strdelimw(char **s)
352: {
353: return strdelim_internal(s, 0);
1.2 markus 354: }
355:
356: struct passwd *
357: pwcopy(struct passwd *pw)
358: {
1.49 djm 359: struct passwd *copy = xcalloc(1, sizeof(*copy));
1.4 deraadt 360:
1.2 markus 361: copy->pw_name = xstrdup(pw->pw_name);
362: copy->pw_passwd = xstrdup(pw->pw_passwd);
1.4 deraadt 363: copy->pw_gecos = xstrdup(pw->pw_gecos);
1.2 markus 364: copy->pw_uid = pw->pw_uid;
365: copy->pw_gid = pw->pw_gid;
1.11 markus 366: copy->pw_expire = pw->pw_expire;
367: copy->pw_change = pw->pw_change;
1.2 markus 368: copy->pw_class = xstrdup(pw->pw_class);
369: copy->pw_dir = xstrdup(pw->pw_dir);
370: copy->pw_shell = xstrdup(pw->pw_shell);
371: return copy;
1.5 stevesk 372: }
373:
1.12 markus 374: /*
375: * Convert ASCII string to TCP/IP port number.
1.70 djm 376: * Port must be >=0 and <=65535.
377: * Return -1 if invalid.
1.12 markus 378: */
379: int
380: a2port(const char *s)
1.5 stevesk 381: {
1.133 naddy 382: struct servent *se;
1.70 djm 383: long long port;
384: const char *errstr;
1.5 stevesk 385:
1.70 djm 386: port = strtonum(s, 0, 65535, &errstr);
1.133 naddy 387: if (errstr == NULL)
388: return (int)port;
389: if ((se = getservbyname(s, "tcp")) != NULL)
390: return ntohs(se->s_port);
391: return -1;
1.9 stevesk 392: }
393:
1.36 reyk 394: int
395: a2tun(const char *s, int *remote)
396: {
397: const char *errstr = NULL;
398: char *sp, *ep;
399: int tun;
400:
401: if (remote != NULL) {
1.37 reyk 402: *remote = SSH_TUNID_ANY;
1.36 reyk 403: sp = xstrdup(s);
404: if ((ep = strchr(sp, ':')) == NULL) {
1.89 djm 405: free(sp);
1.36 reyk 406: return (a2tun(s, NULL));
407: }
408: ep[0] = '\0'; ep++;
409: *remote = a2tun(ep, NULL);
410: tun = a2tun(sp, NULL);
1.89 djm 411: free(sp);
1.37 reyk 412: return (*remote == SSH_TUNID_ERR ? *remote : tun);
1.36 reyk 413: }
414:
415: if (strcasecmp(s, "any") == 0)
1.37 reyk 416: return (SSH_TUNID_ANY);
1.36 reyk 417:
1.37 reyk 418: tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
419: if (errstr != NULL)
420: return (SSH_TUNID_ERR);
1.36 reyk 421:
422: return (tun);
423: }
424:
1.9 stevesk 425: #define SECONDS 1
426: #define MINUTES (SECONDS * 60)
427: #define HOURS (MINUTES * 60)
428: #define DAYS (HOURS * 24)
429: #define WEEKS (DAYS * 7)
430:
1.12 markus 431: /*
432: * Convert a time string into seconds; format is
433: * a sequence of:
434: * time[qualifier]
435: *
436: * Valid time qualifiers are:
437: * <none> seconds
438: * s|S seconds
439: * m|M minutes
440: * h|H hours
441: * d|D days
442: * w|W weeks
443: *
444: * Examples:
445: * 90m 90 minutes
446: * 1h30m 90 minutes
447: * 2d 2 days
448: * 1w 1 week
449: *
450: * Return -1 if time string is invalid.
451: */
452: long
453: convtime(const char *s)
1.9 stevesk 454: {
1.108 dtucker 455: long total, secs, multiplier = 1;
1.9 stevesk 456: const char *p;
457: char *endp;
458:
459: errno = 0;
460: total = 0;
461: p = s;
462:
463: if (p == NULL || *p == '\0')
464: return -1;
465:
466: while (*p) {
467: secs = strtol(p, &endp, 10);
468: if (p == endp ||
469: (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) ||
470: secs < 0)
471: return -1;
472:
473: switch (*endp++) {
474: case '\0':
475: endp--;
1.48 deraadt 476: break;
1.9 stevesk 477: case 's':
478: case 'S':
479: break;
480: case 'm':
481: case 'M':
1.108 dtucker 482: multiplier = MINUTES;
1.9 stevesk 483: break;
484: case 'h':
485: case 'H':
1.108 dtucker 486: multiplier = HOURS;
1.9 stevesk 487: break;
488: case 'd':
489: case 'D':
1.108 dtucker 490: multiplier = DAYS;
1.9 stevesk 491: break;
492: case 'w':
493: case 'W':
1.108 dtucker 494: multiplier = WEEKS;
1.9 stevesk 495: break;
496: default:
497: return -1;
498: }
1.109 dtucker 499: if (secs >= LONG_MAX / multiplier)
1.108 dtucker 500: return -1;
501: secs *= multiplier;
1.109 dtucker 502: if (total >= LONG_MAX - secs)
1.108 dtucker 503: return -1;
1.9 stevesk 504: total += secs;
505: if (total < 0)
506: return -1;
507: p = endp;
508: }
509:
510: return total;
1.148 ! djm 511: }
! 512:
! 513: #define TF_BUFS 8
! 514: #define TF_LEN 9
! 515:
! 516: const char *
! 517: fmt_timeframe(time_t t)
! 518: {
! 519: char *buf;
! 520: static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */
! 521: static int idx = 0;
! 522: unsigned int sec, min, hrs, day;
! 523: unsigned long long week;
! 524:
! 525: buf = tfbuf[idx++];
! 526: if (idx == TF_BUFS)
! 527: idx = 0;
! 528:
! 529: week = t;
! 530:
! 531: sec = week % 60;
! 532: week /= 60;
! 533: min = week % 60;
! 534: week /= 60;
! 535: hrs = week % 24;
! 536: week /= 24;
! 537: day = week % 7;
! 538: week /= 7;
! 539:
! 540: if (week > 0)
! 541: snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
! 542: else if (day > 0)
! 543: snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
! 544: else
! 545: snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);
! 546:
! 547: return (buf);
1.56 dtucker 548: }
549:
550: /*
551: * Returns a standardized host+port identifier string.
552: * Caller must free returned string.
553: */
554: char *
555: put_host_port(const char *host, u_short port)
556: {
557: char *hoststr;
558:
559: if (port == 0 || port == SSH_DEFAULT_PORT)
560: return(xstrdup(host));
1.138 deraadt 561: if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
1.56 dtucker 562: fatal("put_host_port: asprintf: %s", strerror(errno));
563: debug3("put_host_port: %s", hoststr);
564: return hoststr;
1.28 djm 565: }
566:
567: /*
568: * Search for next delimiter between hostnames/addresses and ports.
569: * Argument may be modified (for termination).
570: * Returns *cp if parsing succeeds.
1.114 millert 571: * *cp is set to the start of the next field, if one was found.
572: * The delimiter char, if present, is stored in delim.
1.28 djm 573: * If this is the last field, *cp is set to NULL.
574: */
1.137 dtucker 575: char *
1.114 millert 576: hpdelim2(char **cp, char *delim)
1.28 djm 577: {
578: char *s, *old;
579:
580: if (cp == NULL || *cp == NULL)
581: return NULL;
582:
583: old = s = *cp;
584: if (*s == '[') {
585: if ((s = strchr(s, ']')) == NULL)
586: return NULL;
587: else
588: s++;
589: } else if ((s = strpbrk(s, ":/")) == NULL)
590: s = *cp + strlen(*cp); /* skip to end (see first case below) */
591:
592: switch (*s) {
593: case '\0':
594: *cp = NULL; /* no more fields*/
595: break;
1.29 deraadt 596:
1.28 djm 597: case ':':
598: case '/':
1.114 millert 599: if (delim != NULL)
600: *delim = *s;
1.28 djm 601: *s = '\0'; /* terminate */
602: *cp = s + 1;
603: break;
1.29 deraadt 604:
1.28 djm 605: default:
606: return NULL;
607: }
608:
609: return old;
1.6 mouring 610: }
611:
612: char *
1.114 millert 613: hpdelim(char **cp)
614: {
615: return hpdelim2(cp, NULL);
616: }
617:
618: char *
1.6 mouring 619: cleanhostname(char *host)
620: {
621: if (*host == '[' && host[strlen(host) - 1] == ']') {
622: host[strlen(host) - 1] = '\0';
623: return (host + 1);
624: } else
625: return host;
626: }
627:
628: char *
629: colon(char *cp)
630: {
631: int flag = 0;
632:
633: if (*cp == ':') /* Leading colon is part of file name. */
1.76 djm 634: return NULL;
1.6 mouring 635: if (*cp == '[')
636: flag = 1;
637:
638: for (; *cp; ++cp) {
639: if (*cp == '@' && *(cp+1) == '[')
640: flag = 1;
641: if (*cp == ']' && *(cp+1) == ':' && flag)
642: return (cp+1);
643: if (*cp == ':' && !flag)
644: return (cp);
645: if (*cp == '/')
1.76 djm 646: return NULL;
1.6 mouring 647: }
1.76 djm 648: return NULL;
1.105 djm 649: }
650:
651: /*
1.114 millert 652: * Parse a [user@]host:[path] string.
653: * Caller must free returned user, host and path.
654: * Any of the pointer return arguments may be NULL (useful for syntax checking).
655: * If user was not specified then *userp will be set to NULL.
656: * If host was not specified then *hostp will be set to NULL.
657: * If path was not specified then *pathp will be set to ".".
658: * Returns 0 on success, -1 on failure.
659: */
660: int
661: parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
662: {
663: char *user = NULL, *host = NULL, *path = NULL;
664: char *sdup, *tmp;
665: int ret = -1;
666:
667: if (userp != NULL)
668: *userp = NULL;
669: if (hostp != NULL)
670: *hostp = NULL;
671: if (pathp != NULL)
672: *pathp = NULL;
673:
1.116 millert 674: sdup = xstrdup(s);
1.114 millert 675:
676: /* Check for remote syntax: [user@]host:[path] */
677: if ((tmp = colon(sdup)) == NULL)
678: goto out;
679:
680: /* Extract optional path */
681: *tmp++ = '\0';
682: if (*tmp == '\0')
683: tmp = ".";
684: path = xstrdup(tmp);
685:
686: /* Extract optional user and mandatory host */
687: tmp = strrchr(sdup, '@');
688: if (tmp != NULL) {
689: *tmp++ = '\0';
690: host = xstrdup(cleanhostname(tmp));
691: if (*sdup != '\0')
692: user = xstrdup(sdup);
693: } else {
694: host = xstrdup(cleanhostname(sdup));
695: user = NULL;
696: }
697:
698: /* Success */
699: if (userp != NULL) {
700: *userp = user;
701: user = NULL;
702: }
703: if (hostp != NULL) {
704: *hostp = host;
705: host = NULL;
1.116 millert 706: }
1.114 millert 707: if (pathp != NULL) {
708: *pathp = path;
709: path = NULL;
1.116 millert 710: }
1.114 millert 711: ret = 0;
712: out:
713: free(sdup);
714: free(user);
715: free(host);
716: free(path);
717: return ret;
718: }
719:
720: /*
1.105 djm 721: * Parse a [user@]host[:port] string.
722: * Caller must free returned user and host.
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 port was not specified then *portp will be -1.
726: * Returns 0 on success, -1 on failure.
727: */
728: int
729: parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
730: {
731: char *sdup, *cp, *tmp;
732: char *user = NULL, *host = NULL;
733: int port = -1, ret = -1;
734:
735: if (userp != NULL)
736: *userp = NULL;
737: if (hostp != NULL)
738: *hostp = NULL;
739: if (portp != NULL)
740: *portp = -1;
741:
742: if ((sdup = tmp = strdup(s)) == NULL)
743: return -1;
744: /* Extract optional username */
1.114 millert 745: if ((cp = strrchr(tmp, '@')) != NULL) {
1.105 djm 746: *cp = '\0';
747: if (*tmp == '\0')
748: goto out;
749: if ((user = strdup(tmp)) == NULL)
750: goto out;
751: tmp = cp + 1;
752: }
753: /* Extract mandatory hostname */
754: if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
755: goto out;
756: host = xstrdup(cleanhostname(cp));
757: /* Convert and verify optional port */
758: if (tmp != NULL && *tmp != '\0') {
759: if ((port = a2port(tmp)) <= 0)
760: goto out;
761: }
762: /* Success */
763: if (userp != NULL) {
764: *userp = user;
765: user = NULL;
766: }
767: if (hostp != NULL) {
768: *hostp = host;
769: host = NULL;
770: }
771: if (portp != NULL)
772: *portp = port;
773: ret = 0;
774: out:
775: free(sdup);
776: free(user);
777: free(host);
778: return ret;
1.7 mouring 779: }
780:
1.114 millert 781: /*
782: * Converts a two-byte hex string to decimal.
783: * Returns the decimal value or -1 for invalid input.
784: */
785: static int
786: hexchar(const char *s)
787: {
788: unsigned char result[2];
789: int i;
790:
791: for (i = 0; i < 2; i++) {
792: if (s[i] >= '0' && s[i] <= '9')
793: result[i] = (unsigned char)(s[i] - '0');
794: else if (s[i] >= 'a' && s[i] <= 'f')
795: result[i] = (unsigned char)(s[i] - 'a') + 10;
796: else if (s[i] >= 'A' && s[i] <= 'F')
797: result[i] = (unsigned char)(s[i] - 'A') + 10;
798: else
799: return -1;
800: }
801: return (result[0] << 4) | result[1];
802: }
803:
804: /*
805: * Decode an url-encoded string.
806: * Returns a newly allocated string on success or NULL on failure.
807: */
808: static char *
809: urldecode(const char *src)
810: {
811: char *ret, *dst;
812: int ch;
813:
814: ret = xmalloc(strlen(src) + 1);
815: for (dst = ret; *src != '\0'; src++) {
816: switch (*src) {
817: case '+':
818: *dst++ = ' ';
819: break;
820: case '%':
821: if (!isxdigit((unsigned char)src[1]) ||
822: !isxdigit((unsigned char)src[2]) ||
823: (ch = hexchar(src + 1)) == -1) {
824: free(ret);
825: return NULL;
826: }
827: *dst++ = ch;
828: src += 2;
829: break;
830: default:
831: *dst++ = *src;
832: break;
833: }
834: }
835: *dst = '\0';
836:
837: return ret;
838: }
839:
840: /*
841: * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
842: * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
843: * Either user or path may be url-encoded (but not host or port).
844: * Caller must free returned user, host and path.
845: * Any of the pointer return arguments may be NULL (useful for syntax checking)
846: * but the scheme must always be specified.
847: * If user was not specified then *userp will be set to NULL.
848: * If port was not specified then *portp will be -1.
849: * If path was not specified then *pathp will be set to NULL.
850: * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
851: */
852: int
853: parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
854: int *portp, char **pathp)
855: {
856: char *uridup, *cp, *tmp, ch;
857: char *user = NULL, *host = NULL, *path = NULL;
858: int port = -1, ret = -1;
859: size_t len;
860:
861: len = strlen(scheme);
862: if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
863: return 1;
864: uri += len + 3;
865:
866: if (userp != NULL)
867: *userp = NULL;
868: if (hostp != NULL)
869: *hostp = NULL;
870: if (portp != NULL)
871: *portp = -1;
872: if (pathp != NULL)
873: *pathp = NULL;
874:
875: uridup = tmp = xstrdup(uri);
876:
877: /* Extract optional ssh-info (username + connection params) */
878: if ((cp = strchr(tmp, '@')) != NULL) {
879: char *delim;
880:
881: *cp = '\0';
882: /* Extract username and connection params */
883: if ((delim = strchr(tmp, ';')) != NULL) {
884: /* Just ignore connection params for now */
885: *delim = '\0';
886: }
887: if (*tmp == '\0') {
888: /* Empty username */
889: goto out;
890: }
891: if ((user = urldecode(tmp)) == NULL)
892: goto out;
893: tmp = cp + 1;
894: }
895:
896: /* Extract mandatory hostname */
897: if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
898: goto out;
899: host = xstrdup(cleanhostname(cp));
900: if (!valid_domain(host, 0, NULL))
901: goto out;
902:
903: if (tmp != NULL && *tmp != '\0') {
904: if (ch == ':') {
905: /* Convert and verify port. */
906: if ((cp = strchr(tmp, '/')) != NULL)
907: *cp = '\0';
908: if ((port = a2port(tmp)) <= 0)
909: goto out;
910: tmp = cp ? cp + 1 : NULL;
911: }
912: if (tmp != NULL && *tmp != '\0') {
913: /* Extract optional path */
914: if ((path = urldecode(tmp)) == NULL)
915: goto out;
916: }
917: }
918:
919: /* Success */
920: if (userp != NULL) {
921: *userp = user;
922: user = NULL;
923: }
924: if (hostp != NULL) {
925: *hostp = host;
926: host = NULL;
927: }
928: if (portp != NULL)
929: *portp = port;
930: if (pathp != NULL) {
931: *pathp = path;
932: path = NULL;
933: }
934: ret = 0;
935: out:
936: free(uridup);
937: free(user);
938: free(host);
939: free(path);
940: return ret;
941: }
942:
1.12 markus 943: /* function to assist building execv() arguments */
1.7 mouring 944: void
945: addargs(arglist *args, char *fmt, ...)
946: {
947: va_list ap;
1.42 djm 948: char *cp;
1.25 avsm 949: u_int nalloc;
1.42 djm 950: int r;
1.7 mouring 951:
952: va_start(ap, fmt);
1.42 djm 953: r = vasprintf(&cp, fmt, ap);
1.7 mouring 954: va_end(ap);
1.42 djm 955: if (r == -1)
956: fatal("addargs: argument too long");
1.7 mouring 957:
1.22 markus 958: nalloc = args->nalloc;
1.7 mouring 959: if (args->list == NULL) {
1.22 markus 960: nalloc = 32;
1.7 mouring 961: args->num = 0;
1.22 markus 962: } else if (args->num+2 >= nalloc)
963: nalloc *= 2;
1.7 mouring 964:
1.110 deraadt 965: args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *));
1.22 markus 966: args->nalloc = nalloc;
1.42 djm 967: args->list[args->num++] = cp;
1.7 mouring 968: args->list[args->num] = NULL;
1.42 djm 969: }
970:
971: void
972: replacearg(arglist *args, u_int which, char *fmt, ...)
973: {
974: va_list ap;
975: char *cp;
976: int r;
977:
978: va_start(ap, fmt);
979: r = vasprintf(&cp, fmt, ap);
980: va_end(ap);
981: if (r == -1)
982: fatal("replacearg: argument too long");
983:
984: if (which >= args->num)
985: fatal("replacearg: tried to replace invalid arg %d >= %d",
986: which, args->num);
1.89 djm 987: free(args->list[which]);
1.42 djm 988: args->list[which] = cp;
989: }
990:
991: void
992: freeargs(arglist *args)
993: {
994: u_int i;
995:
996: if (args->list != NULL) {
997: for (i = 0; i < args->num; i++)
1.89 djm 998: free(args->list[i]);
999: free(args->list);
1.42 djm 1000: args->nalloc = args->num = 0;
1001: args->list = NULL;
1002: }
1.30 djm 1003: }
1004:
1005: /*
1006: * Expands tildes in the file name. Returns data allocated by xmalloc.
1007: * Warning: this calls getpw*.
1008: */
1009: char *
1010: tilde_expand_filename(const char *filename, uid_t uid)
1011: {
1.87 tedu 1012: const char *path, *sep;
1013: char user[128], *ret;
1.30 djm 1014: struct passwd *pw;
1.32 djm 1015: u_int len, slash;
1.30 djm 1016:
1017: if (*filename != '~')
1018: return (xstrdup(filename));
1019: filename++;
1020:
1021: path = strchr(filename, '/');
1022: if (path != NULL && path > filename) { /* ~user/path */
1.32 djm 1023: slash = path - filename;
1024: if (slash > sizeof(user) - 1)
1.30 djm 1025: fatal("tilde_expand_filename: ~username too long");
1.32 djm 1026: memcpy(user, filename, slash);
1027: user[slash] = '\0';
1.30 djm 1028: if ((pw = getpwnam(user)) == NULL)
1029: fatal("tilde_expand_filename: No such user %s", user);
1030: } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */
1.69 dtucker 1031: fatal("tilde_expand_filename: No such uid %ld", (long)uid);
1.30 djm 1032:
1033: /* Make sure directory has a trailing '/' */
1034: len = strlen(pw->pw_dir);
1.88 tedu 1035: if (len == 0 || pw->pw_dir[len - 1] != '/')
1.87 tedu 1036: sep = "/";
1037: else
1038: sep = "";
1.30 djm 1039:
1040: /* Skip leading '/' from specified path */
1041: if (path != NULL)
1042: filename = path + 1;
1.87 tedu 1043:
1.96 deraadt 1044: if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX)
1.30 djm 1045: fatal("tilde_expand_filename: Path too long");
1046:
1.87 tedu 1047: return (ret);
1.31 djm 1048: }
1049:
1050: /*
1051: * Expand a string with a set of %[char] escapes. A number of escapes may be
1052: * specified as (char *escape_chars, char *replacement) pairs. The list must
1.34 dtucker 1053: * be terminated by a NULL escape_char. Returns replaced string in memory
1.31 djm 1054: * allocated by xmalloc.
1055: */
1056: char *
1057: percent_expand(const char *string, ...)
1058: {
1059: #define EXPAND_MAX_KEYS 16
1.140 djm 1060: u_int num_keys, i;
1.31 djm 1061: struct {
1062: const char *key;
1063: const char *repl;
1064: } keys[EXPAND_MAX_KEYS];
1.140 djm 1065: struct sshbuf *buf;
1.31 djm 1066: va_list ap;
1.140 djm 1067: int r;
1068: char *ret;
1069:
1070: if ((buf = sshbuf_new()) == NULL)
1071: fatal("%s: sshbuf_new failed", __func__);
1.31 djm 1072:
1073: /* Gather keys */
1074: va_start(ap, string);
1075: for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
1076: keys[num_keys].key = va_arg(ap, char *);
1077: if (keys[num_keys].key == NULL)
1078: break;
1079: keys[num_keys].repl = va_arg(ap, char *);
1080: if (keys[num_keys].repl == NULL)
1.73 djm 1081: fatal("%s: NULL replacement", __func__);
1.31 djm 1082: }
1.73 djm 1083: if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
1084: fatal("%s: too many keys", __func__);
1.31 djm 1085: va_end(ap);
1086:
1087: /* Expand string */
1088: for (i = 0; *string != '\0'; string++) {
1089: if (*string != '%') {
1090: append:
1.140 djm 1091: if ((r = sshbuf_put_u8(buf, *string)) != 0) {
1092: fatal("%s: sshbuf_put_u8: %s",
1093: __func__, ssh_err(r));
1094: }
1.31 djm 1095: continue;
1096: }
1097: string++;
1.73 djm 1098: /* %% case */
1.31 djm 1099: if (*string == '%')
1100: goto append;
1.100 tobias 1101: if (*string == '\0')
1102: fatal("%s: invalid format", __func__);
1.140 djm 1103: for (i = 0; i < num_keys; i++) {
1104: if (strchr(keys[i].key, *string) != NULL) {
1105: if ((r = sshbuf_put(buf, keys[i].repl,
1106: strlen(keys[i].repl))) != 0) {
1107: fatal("%s: sshbuf_put: %s",
1108: __func__, ssh_err(r));
1109: }
1.31 djm 1110: break;
1111: }
1112: }
1.140 djm 1113: if (i >= num_keys)
1.73 djm 1114: fatal("%s: unknown key %%%c", __func__, *string);
1.31 djm 1115: }
1.140 djm 1116: if ((ret = sshbuf_dup_string(buf)) == NULL)
1117: fatal("%s: sshbuf_dup_string failed", __func__);
1118: sshbuf_free(buf);
1119: return ret;
1.31 djm 1120: #undef EXPAND_MAX_KEYS
1.36 reyk 1121: }
1122:
1123: int
1.115 djm 1124: tun_open(int tun, int mode, char **ifname)
1.36 reyk 1125: {
1.37 reyk 1126: struct ifreq ifr;
1.36 reyk 1127: char name[100];
1.37 reyk 1128: int fd = -1, sock;
1.99 sthen 1129: const char *tunbase = "tun";
1130:
1.115 djm 1131: if (ifname != NULL)
1132: *ifname = NULL;
1133:
1.99 sthen 1134: if (mode == SSH_TUNMODE_ETHERNET)
1135: tunbase = "tap";
1.36 reyk 1136:
1.37 reyk 1137: /* Open the tunnel device */
1138: if (tun <= SSH_TUNID_MAX) {
1.99 sthen 1139: snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
1.37 reyk 1140: fd = open(name, O_RDWR);
1141: } else if (tun == SSH_TUNID_ANY) {
1142: for (tun = 100; tun >= 0; tun--) {
1.99 sthen 1143: snprintf(name, sizeof(name), "/dev/%s%d",
1144: tunbase, tun);
1.37 reyk 1145: if ((fd = open(name, O_RDWR)) >= 0)
1146: break;
1.36 reyk 1147: }
1148: } else {
1.39 stevesk 1149: debug("%s: invalid tunnel %u", __func__, tun);
1.98 djm 1150: return -1;
1.37 reyk 1151: }
1152:
1.139 deraadt 1153: if (fd == -1) {
1.98 djm 1154: debug("%s: %s open: %s", __func__, name, strerror(errno));
1155: return -1;
1.36 reyk 1156: }
1.37 reyk 1157:
1158: debug("%s: %s mode %d fd %d", __func__, name, mode, fd);
1159:
1.99 sthen 1160: /* Bring interface up if it is not already */
1161: snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
1162: if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
1.37 reyk 1163: goto failed;
1164:
1.98 djm 1165: if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
1166: debug("%s: get interface %s flags: %s", __func__,
1167: ifr.ifr_name, strerror(errno));
1.37 reyk 1168: goto failed;
1.98 djm 1169: }
1.40 reyk 1170:
1.98 djm 1171: if (!(ifr.ifr_flags & IFF_UP)) {
1172: ifr.ifr_flags |= IFF_UP;
1173: if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
1174: debug("%s: activate interface %s: %s", __func__,
1175: ifr.ifr_name, strerror(errno));
1176: goto failed;
1177: }
1178: }
1.115 djm 1179:
1180: if (ifname != NULL)
1181: *ifname = xstrdup(ifr.ifr_name);
1.37 reyk 1182:
1183: close(sock);
1.98 djm 1184: return fd;
1.37 reyk 1185:
1186: failed:
1187: if (fd >= 0)
1188: close(fd);
1189: if (sock >= 0)
1190: close(sock);
1.98 djm 1191: return -1;
1.35 djm 1192: }
1193:
1194: void
1195: sanitise_stdfd(void)
1196: {
1.41 djm 1197: int nullfd, dupfd;
1.35 djm 1198:
1.41 djm 1199: if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
1.71 tobias 1200: fprintf(stderr, "Couldn't open /dev/null: %s\n",
1201: strerror(errno));
1.35 djm 1202: exit(1);
1203: }
1.103 krw 1204: while (++dupfd <= STDERR_FILENO) {
1205: /* Only populate closed fds. */
1206: if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
1207: if (dup2(nullfd, dupfd) == -1) {
1208: fprintf(stderr, "dup2: %s\n", strerror(errno));
1209: exit(1);
1210: }
1.35 djm 1211: }
1212: }
1.103 krw 1213: if (nullfd > STDERR_FILENO)
1.35 djm 1214: close(nullfd);
1.1 markus 1215: }
1.33 djm 1216:
1217: char *
1.52 djm 1218: tohex(const void *vp, size_t l)
1.33 djm 1219: {
1.52 djm 1220: const u_char *p = (const u_char *)vp;
1.33 djm 1221: char b[3], *r;
1.52 djm 1222: size_t i, hl;
1223:
1224: if (l > 65536)
1225: return xstrdup("tohex: length > 65536");
1.33 djm 1226:
1227: hl = l * 2 + 1;
1.49 djm 1228: r = xcalloc(1, hl);
1.33 djm 1229: for (i = 0; i < l; i++) {
1.52 djm 1230: snprintf(b, sizeof(b), "%02x", p[i]);
1.33 djm 1231: strlcat(r, b, hl);
1232: }
1233: return (r);
1234: }
1.145 djm 1235:
1236: /*
1237: * Extend string *sp by the specified format. If *sp is not NULL (or empty),
1238: * then the separator 'sep' will be prepended before the formatted arguments.
1239: * Extended strings are heap allocated.
1240: */
1241: void
1242: xextendf(char **sp, const char *sep, const char *fmt, ...)
1243: {
1244: va_list ap;
1245: char *tmp1, *tmp2;
1246:
1247: va_start(ap, fmt);
1248: xvasprintf(&tmp1, fmt, ap);
1249: va_end(ap);
1250:
1251: if (*sp == NULL || **sp == '\0') {
1252: free(*sp);
1253: *sp = tmp1;
1254: return;
1255: }
1256: xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1);
1257: free(tmp1);
1258: free(*sp);
1259: *sp = tmp2;
1260: }
1261:
1.33 djm 1262:
1.52 djm 1263: u_int64_t
1264: get_u64(const void *vp)
1265: {
1266: const u_char *p = (const u_char *)vp;
1267: u_int64_t v;
1268:
1269: v = (u_int64_t)p[0] << 56;
1270: v |= (u_int64_t)p[1] << 48;
1271: v |= (u_int64_t)p[2] << 40;
1272: v |= (u_int64_t)p[3] << 32;
1273: v |= (u_int64_t)p[4] << 24;
1274: v |= (u_int64_t)p[5] << 16;
1275: v |= (u_int64_t)p[6] << 8;
1276: v |= (u_int64_t)p[7];
1277:
1278: return (v);
1279: }
1280:
1281: u_int32_t
1282: get_u32(const void *vp)
1283: {
1284: const u_char *p = (const u_char *)vp;
1285: u_int32_t v;
1286:
1287: v = (u_int32_t)p[0] << 24;
1288: v |= (u_int32_t)p[1] << 16;
1289: v |= (u_int32_t)p[2] << 8;
1290: v |= (u_int32_t)p[3];
1291:
1292: return (v);
1293: }
1294:
1.93 djm 1295: u_int32_t
1296: get_u32_le(const void *vp)
1297: {
1298: const u_char *p = (const u_char *)vp;
1299: u_int32_t v;
1300:
1301: v = (u_int32_t)p[0];
1302: v |= (u_int32_t)p[1] << 8;
1303: v |= (u_int32_t)p[2] << 16;
1304: v |= (u_int32_t)p[3] << 24;
1305:
1306: return (v);
1307: }
1308:
1.52 djm 1309: u_int16_t
1310: get_u16(const void *vp)
1311: {
1312: const u_char *p = (const u_char *)vp;
1313: u_int16_t v;
1314:
1315: v = (u_int16_t)p[0] << 8;
1316: v |= (u_int16_t)p[1];
1317:
1318: return (v);
1319: }
1320:
1321: void
1322: put_u64(void *vp, u_int64_t v)
1323: {
1324: u_char *p = (u_char *)vp;
1325:
1326: p[0] = (u_char)(v >> 56) & 0xff;
1327: p[1] = (u_char)(v >> 48) & 0xff;
1328: p[2] = (u_char)(v >> 40) & 0xff;
1329: p[3] = (u_char)(v >> 32) & 0xff;
1330: p[4] = (u_char)(v >> 24) & 0xff;
1331: p[5] = (u_char)(v >> 16) & 0xff;
1332: p[6] = (u_char)(v >> 8) & 0xff;
1333: p[7] = (u_char)v & 0xff;
1334: }
1335:
1336: void
1337: put_u32(void *vp, u_int32_t v)
1338: {
1339: u_char *p = (u_char *)vp;
1340:
1341: p[0] = (u_char)(v >> 24) & 0xff;
1342: p[1] = (u_char)(v >> 16) & 0xff;
1343: p[2] = (u_char)(v >> 8) & 0xff;
1344: p[3] = (u_char)v & 0xff;
1345: }
1346:
1.93 djm 1347: void
1348: put_u32_le(void *vp, u_int32_t v)
1349: {
1350: u_char *p = (u_char *)vp;
1351:
1352: p[0] = (u_char)v & 0xff;
1353: p[1] = (u_char)(v >> 8) & 0xff;
1354: p[2] = (u_char)(v >> 16) & 0xff;
1355: p[3] = (u_char)(v >> 24) & 0xff;
1356: }
1.52 djm 1357:
1358: void
1359: put_u16(void *vp, u_int16_t v)
1360: {
1361: u_char *p = (u_char *)vp;
1362:
1363: p[0] = (u_char)(v >> 8) & 0xff;
1364: p[1] = (u_char)v & 0xff;
1365: }
1.68 dtucker 1366:
1367: void
1368: ms_subtract_diff(struct timeval *start, int *ms)
1369: {
1370: struct timeval diff, finish;
1371:
1.119 dtucker 1372: monotime_tv(&finish);
1373: timersub(&finish, start, &diff);
1.68 dtucker 1374: *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
1375: }
1376:
1377: void
1378: ms_to_timeval(struct timeval *tv, int ms)
1379: {
1380: if (ms < 0)
1381: ms = 0;
1382: tv->tv_sec = ms / 1000;
1383: tv->tv_usec = (ms % 1000) * 1000;
1.90 dtucker 1384: }
1385:
1.119 dtucker 1386: void
1387: monotime_ts(struct timespec *ts)
1388: {
1389: if (clock_gettime(CLOCK_MONOTONIC, ts) != 0)
1390: fatal("clock_gettime: %s", strerror(errno));
1391: }
1392:
1393: void
1394: monotime_tv(struct timeval *tv)
1395: {
1396: struct timespec ts;
1397:
1398: monotime_ts(&ts);
1399: tv->tv_sec = ts.tv_sec;
1400: tv->tv_usec = ts.tv_nsec / 1000;
1401: }
1402:
1.90 dtucker 1403: time_t
1404: monotime(void)
1405: {
1406: struct timespec ts;
1407:
1.119 dtucker 1408: monotime_ts(&ts);
1.90 dtucker 1409: return (ts.tv_sec);
1.102 dtucker 1410: }
1411:
1412: double
1413: monotime_double(void)
1414: {
1415: struct timespec ts;
1416:
1.119 dtucker 1417: monotime_ts(&ts);
1418: return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0;
1.81 djm 1419: }
1420:
1421: void
1422: bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
1423: {
1424: bw->buflen = buflen;
1425: bw->rate = kbps;
1.135 dtucker 1426: bw->thresh = buflen;
1.81 djm 1427: bw->lamt = 0;
1428: timerclear(&bw->bwstart);
1429: timerclear(&bw->bwend);
1.135 dtucker 1430: }
1.81 djm 1431:
1432: /* Callback from read/write loop to insert bandwidth-limiting delays */
1433: void
1434: bandwidth_limit(struct bwlimit *bw, size_t read_len)
1435: {
1436: u_int64_t waitlen;
1437: struct timespec ts, rm;
1438:
1.135 dtucker 1439: bw->lamt += read_len;
1.81 djm 1440: if (!timerisset(&bw->bwstart)) {
1.119 dtucker 1441: monotime_tv(&bw->bwstart);
1.81 djm 1442: return;
1443: }
1444: if (bw->lamt < bw->thresh)
1445: return;
1446:
1.119 dtucker 1447: monotime_tv(&bw->bwend);
1.81 djm 1448: timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
1449: if (!timerisset(&bw->bwend))
1450: return;
1451:
1452: bw->lamt *= 8;
1453: waitlen = (double)1000000L * bw->lamt / bw->rate;
1454:
1455: bw->bwstart.tv_sec = waitlen / 1000000L;
1456: bw->bwstart.tv_usec = waitlen % 1000000L;
1457:
1458: if (timercmp(&bw->bwstart, &bw->bwend, >)) {
1459: timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
1460:
1461: /* Adjust the wait time */
1462: if (bw->bwend.tv_sec) {
1463: bw->thresh /= 2;
1464: if (bw->thresh < bw->buflen / 4)
1465: bw->thresh = bw->buflen / 4;
1466: } else if (bw->bwend.tv_usec < 10000) {
1467: bw->thresh *= 2;
1468: if (bw->thresh > bw->buflen * 8)
1469: bw->thresh = bw->buflen * 8;
1470: }
1471:
1472: TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
1473: while (nanosleep(&ts, &rm) == -1) {
1474: if (errno != EINTR)
1475: break;
1476: ts = rm;
1477: }
1478: }
1479:
1480: bw->lamt = 0;
1.119 dtucker 1481: monotime_tv(&bw->bwstart);
1.84 djm 1482: }
1483:
1484: /* Make a template filename for mk[sd]temp() */
1485: void
1486: mktemp_proto(char *s, size_t len)
1487: {
1488: const char *tmpdir;
1489: int r;
1490:
1491: if ((tmpdir = getenv("TMPDIR")) != NULL) {
1492: r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
1493: if (r > 0 && (size_t)r < len)
1494: return;
1495: }
1496: r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
1497: if (r < 0 || (size_t)r >= len)
1498: fatal("%s: template string too short", __func__);
1.68 dtucker 1499: }
1.83 djm 1500:
1501: static const struct {
1502: const char *name;
1503: int value;
1504: } ipqos[] = {
1.111 djm 1505: { "none", INT_MAX }, /* can't use 0 here; that's CS0 */
1.83 djm 1506: { "af11", IPTOS_DSCP_AF11 },
1507: { "af12", IPTOS_DSCP_AF12 },
1508: { "af13", IPTOS_DSCP_AF13 },
1.86 djm 1509: { "af21", IPTOS_DSCP_AF21 },
1.83 djm 1510: { "af22", IPTOS_DSCP_AF22 },
1511: { "af23", IPTOS_DSCP_AF23 },
1512: { "af31", IPTOS_DSCP_AF31 },
1513: { "af32", IPTOS_DSCP_AF32 },
1514: { "af33", IPTOS_DSCP_AF33 },
1515: { "af41", IPTOS_DSCP_AF41 },
1516: { "af42", IPTOS_DSCP_AF42 },
1517: { "af43", IPTOS_DSCP_AF43 },
1518: { "cs0", IPTOS_DSCP_CS0 },
1519: { "cs1", IPTOS_DSCP_CS1 },
1520: { "cs2", IPTOS_DSCP_CS2 },
1521: { "cs3", IPTOS_DSCP_CS3 },
1522: { "cs4", IPTOS_DSCP_CS4 },
1523: { "cs5", IPTOS_DSCP_CS5 },
1524: { "cs6", IPTOS_DSCP_CS6 },
1525: { "cs7", IPTOS_DSCP_CS7 },
1526: { "ef", IPTOS_DSCP_EF },
1.146 djm 1527: { "le", IPTOS_DSCP_LE },
1.83 djm 1528: { "lowdelay", IPTOS_LOWDELAY },
1529: { "throughput", IPTOS_THROUGHPUT },
1530: { "reliability", IPTOS_RELIABILITY },
1531: { NULL, -1 }
1532: };
1533:
1534: int
1535: parse_ipqos(const char *cp)
1536: {
1537: u_int i;
1538: char *ep;
1539: long val;
1540:
1541: if (cp == NULL)
1542: return -1;
1543: for (i = 0; ipqos[i].name != NULL; i++) {
1544: if (strcasecmp(cp, ipqos[i].name) == 0)
1545: return ipqos[i].value;
1546: }
1547: /* Try parsing as an integer */
1548: val = strtol(cp, &ep, 0);
1549: if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
1550: return -1;
1551: return val;
1552: }
1553:
1.85 stevesk 1554: const char *
1555: iptos2str(int iptos)
1556: {
1557: int i;
1558: static char iptos_str[sizeof "0xff"];
1559:
1560: for (i = 0; ipqos[i].name != NULL; i++) {
1561: if (ipqos[i].value == iptos)
1562: return ipqos[i].name;
1563: }
1564: snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
1565: return iptos_str;
1.92 djm 1566: }
1567:
1568: void
1569: lowercase(char *s)
1570: {
1571: for (; *s; s++)
1572: *s = tolower((u_char)*s);
1.94 millert 1573: }
1574:
1575: int
1576: unix_listener(const char *path, int backlog, int unlink_first)
1577: {
1578: struct sockaddr_un sunaddr;
1579: int saved_errno, sock;
1580:
1581: memset(&sunaddr, 0, sizeof(sunaddr));
1582: sunaddr.sun_family = AF_UNIX;
1.121 djm 1583: if (strlcpy(sunaddr.sun_path, path,
1584: sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
1585: error("%s: path \"%s\" too long for Unix domain socket",
1586: __func__, path);
1.94 millert 1587: errno = ENAMETOOLONG;
1588: return -1;
1589: }
1590:
1591: sock = socket(PF_UNIX, SOCK_STREAM, 0);
1.139 deraadt 1592: if (sock == -1) {
1.94 millert 1593: saved_errno = errno;
1.121 djm 1594: error("%s: socket: %.100s", __func__, strerror(errno));
1.94 millert 1595: errno = saved_errno;
1596: return -1;
1597: }
1598: if (unlink_first == 1) {
1599: if (unlink(path) != 0 && errno != ENOENT)
1600: error("unlink(%s): %.100s", path, strerror(errno));
1601: }
1.139 deraadt 1602: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
1.94 millert 1603: saved_errno = errno;
1.121 djm 1604: error("%s: cannot bind to path %s: %s",
1605: __func__, path, strerror(errno));
1.122 djm 1606: close(sock);
1.94 millert 1607: errno = saved_errno;
1608: return -1;
1609: }
1.139 deraadt 1610: if (listen(sock, backlog) == -1) {
1.94 millert 1611: saved_errno = errno;
1.122 djm 1612: error("%s: cannot listen on path %s: %s",
1613: __func__, path, strerror(errno));
1.94 millert 1614: close(sock);
1615: unlink(path);
1616: errno = saved_errno;
1617: return -1;
1618: }
1619: return sock;
1.85 stevesk 1620: }
1.104 djm 1621:
1622: /*
1623: * Compares two strings that maybe be NULL. Returns non-zero if strings
1624: * are both NULL or are identical, returns zero otherwise.
1625: */
1626: static int
1627: strcmp_maybe_null(const char *a, const char *b)
1628: {
1629: if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
1630: return 0;
1631: if (a != NULL && strcmp(a, b) != 0)
1632: return 0;
1633: return 1;
1634: }
1635:
1636: /*
1637: * Compare two forwards, returning non-zero if they are identical or
1638: * zero otherwise.
1639: */
1640: int
1641: forward_equals(const struct Forward *a, const struct Forward *b)
1642: {
1643: if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
1644: return 0;
1645: if (a->listen_port != b->listen_port)
1646: return 0;
1647: if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
1648: return 0;
1649: if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
1650: return 0;
1651: if (a->connect_port != b->connect_port)
1652: return 0;
1653: if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
1654: return 0;
1655: /* allocated_port and handle are not checked */
1.107 dtucker 1656: return 1;
1657: }
1658:
1659: /* returns 1 if process is already daemonized, 0 otherwise */
1660: int
1661: daemonized(void)
1662: {
1663: int fd;
1664:
1665: if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
1666: close(fd);
1667: return 0; /* have controlling terminal */
1668: }
1669: if (getppid() != 1)
1670: return 0; /* parent is not init */
1671: if (getsid(0) != getpid())
1672: return 0; /* not session leader */
1673: debug3("already daemonized");
1.106 dtucker 1674: return 1;
1675: }
1.112 djm 1676:
1677:
1678: /*
1679: * Splits 's' into an argument vector. Handles quoted string and basic
1680: * escape characters (\\, \", \'). Caller must free the argument vector
1681: * and its members.
1682: */
1683: int
1684: argv_split(const char *s, int *argcp, char ***argvp)
1685: {
1686: int r = SSH_ERR_INTERNAL_ERROR;
1687: int argc = 0, quote, i, j;
1688: char *arg, **argv = xcalloc(1, sizeof(*argv));
1689:
1690: *argvp = NULL;
1691: *argcp = 0;
1692:
1693: for (i = 0; s[i] != '\0'; i++) {
1694: /* Skip leading whitespace */
1695: if (s[i] == ' ' || s[i] == '\t')
1696: continue;
1697:
1698: /* Start of a token */
1699: quote = 0;
1700: if (s[i] == '\\' &&
1701: (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\'))
1702: i++;
1703: else if (s[i] == '\'' || s[i] == '"')
1704: quote = s[i++];
1705:
1706: argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
1707: arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
1708: argv[argc] = NULL;
1709:
1710: /* Copy the token in, removing escapes */
1711: for (j = 0; s[i] != '\0'; i++) {
1712: if (s[i] == '\\') {
1713: if (s[i + 1] == '\'' ||
1714: s[i + 1] == '\"' ||
1715: s[i + 1] == '\\') {
1716: i++; /* Skip '\' */
1717: arg[j++] = s[i];
1718: } else {
1719: /* Unrecognised escape */
1720: arg[j++] = s[i];
1721: }
1722: } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
1723: break; /* done */
1724: else if (quote != 0 && s[i] == quote)
1725: break; /* done */
1726: else
1727: arg[j++] = s[i];
1728: }
1729: if (s[i] == '\0') {
1730: if (quote != 0) {
1731: /* Ran out of string looking for close quote */
1732: r = SSH_ERR_INVALID_FORMAT;
1733: goto out;
1734: }
1735: break;
1736: }
1737: }
1738: /* Success */
1739: *argcp = argc;
1740: *argvp = argv;
1741: argc = 0;
1742: argv = NULL;
1743: r = 0;
1744: out:
1745: if (argc != 0 && argv != NULL) {
1746: for (i = 0; i < argc; i++)
1747: free(argv[i]);
1748: free(argv);
1749: }
1750: return r;
1751: }
1752:
1753: /*
1754: * Reassemble an argument vector into a string, quoting and escaping as
1755: * necessary. Caller must free returned string.
1756: */
1757: char *
1758: argv_assemble(int argc, char **argv)
1759: {
1760: int i, j, ws, r;
1761: char c, *ret;
1762: struct sshbuf *buf, *arg;
1763:
1764: if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
1765: fatal("%s: sshbuf_new failed", __func__);
1766:
1767: for (i = 0; i < argc; i++) {
1768: ws = 0;
1769: sshbuf_reset(arg);
1770: for (j = 0; argv[i][j] != '\0'; j++) {
1771: r = 0;
1772: c = argv[i][j];
1773: switch (c) {
1774: case ' ':
1775: case '\t':
1776: ws = 1;
1777: r = sshbuf_put_u8(arg, c);
1778: break;
1779: case '\\':
1780: case '\'':
1781: case '"':
1782: if ((r = sshbuf_put_u8(arg, '\\')) != 0)
1783: break;
1784: /* FALLTHROUGH */
1785: default:
1786: r = sshbuf_put_u8(arg, c);
1787: break;
1788: }
1789: if (r != 0)
1790: fatal("%s: sshbuf_put_u8: %s",
1791: __func__, ssh_err(r));
1792: }
1793: if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
1794: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
1795: (r = sshbuf_putb(buf, arg)) != 0 ||
1796: (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
1797: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1798: }
1799: if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
1800: fatal("%s: malloc failed", __func__);
1801: memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
1802: ret[sshbuf_len(buf)] = '\0';
1803: sshbuf_free(buf);
1804: sshbuf_free(arg);
1805: return ret;
1806: }
1807:
1808: /* Returns 0 if pid exited cleanly, non-zero otherwise */
1809: int
1.113 djm 1810: exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
1.112 djm 1811: {
1812: int status;
1813:
1814: while (waitpid(pid, &status, 0) == -1) {
1815: if (errno != EINTR) {
1816: error("%s: waitpid: %s", tag, strerror(errno));
1817: return -1;
1818: }
1819: }
1820: if (WIFSIGNALED(status)) {
1821: error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
1822: return -1;
1823: } else if (WEXITSTATUS(status) != 0) {
1.113 djm 1824: do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
1825: "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
1.112 djm 1826: return -1;
1827: }
1828: return 0;
1829: }
1830:
1831: /*
1832: * Check a given path for security. This is defined as all components
1833: * of the path to the file must be owned by either the owner of
1834: * of the file or root and no directories must be group or world writable.
1835: *
1836: * XXX Should any specific check be done for sym links ?
1837: *
1838: * Takes a file name, its stat information (preferably from fstat() to
1839: * avoid races), the uid of the expected owner, their home directory and an
1840: * error buffer plus max size as arguments.
1841: *
1842: * Returns 0 on success and -1 on failure
1843: */
1844: int
1845: safe_path(const char *name, struct stat *stp, const char *pw_dir,
1846: uid_t uid, char *err, size_t errlen)
1847: {
1848: char buf[PATH_MAX], homedir[PATH_MAX];
1849: char *cp;
1850: int comparehome = 0;
1851: struct stat st;
1852:
1853: if (realpath(name, buf) == NULL) {
1854: snprintf(err, errlen, "realpath %s failed: %s", name,
1855: strerror(errno));
1856: return -1;
1857: }
1858: if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
1859: comparehome = 1;
1860:
1861: if (!S_ISREG(stp->st_mode)) {
1862: snprintf(err, errlen, "%s is not a regular file", buf);
1863: return -1;
1864: }
1865: if ((stp->st_uid != 0 && stp->st_uid != uid) ||
1866: (stp->st_mode & 022) != 0) {
1867: snprintf(err, errlen, "bad ownership or modes for file %s",
1868: buf);
1869: return -1;
1870: }
1871:
1872: /* for each component of the canonical path, walking upwards */
1873: for (;;) {
1874: if ((cp = dirname(buf)) == NULL) {
1875: snprintf(err, errlen, "dirname() failed");
1876: return -1;
1877: }
1878: strlcpy(buf, cp, sizeof(buf));
1879:
1.139 deraadt 1880: if (stat(buf, &st) == -1 ||
1.112 djm 1881: (st.st_uid != 0 && st.st_uid != uid) ||
1882: (st.st_mode & 022) != 0) {
1883: snprintf(err, errlen,
1884: "bad ownership or modes for directory %s", buf);
1885: return -1;
1886: }
1887:
1888: /* If are past the homedir then we can stop */
1889: if (comparehome && strcmp(homedir, buf) == 0)
1890: break;
1891:
1892: /*
1893: * dirname should always complete with a "/" path,
1894: * but we can be paranoid and check for "." too
1895: */
1896: if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
1897: break;
1898: }
1899: return 0;
1900: }
1901:
1902: /*
1903: * Version of safe_path() that accepts an open file descriptor to
1904: * avoid races.
1905: *
1906: * Returns 0 on success and -1 on failure
1907: */
1908: int
1909: safe_path_fd(int fd, const char *file, struct passwd *pw,
1910: char *err, size_t errlen)
1911: {
1912: struct stat st;
1913:
1914: /* check the open file to avoid races */
1.139 deraadt 1915: if (fstat(fd, &st) == -1) {
1.112 djm 1916: snprintf(err, errlen, "cannot stat file %s: %s",
1917: file, strerror(errno));
1918: return -1;
1919: }
1920: return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
1921: }
1922:
1923: /*
1924: * Sets the value of the given variable in the environment. If the variable
1925: * already exists, its value is overridden.
1926: */
1927: void
1928: child_set_env(char ***envp, u_int *envsizep, const char *name,
1929: const char *value)
1930: {
1931: char **env;
1932: u_int envsize;
1933: u_int i, namelen;
1934:
1935: if (strchr(name, '=') != NULL) {
1936: error("Invalid environment variable \"%.100s\"", name);
1937: return;
1938: }
1939:
1940: /*
1941: * Find the slot where the value should be stored. If the variable
1942: * already exists, we reuse the slot; otherwise we append a new slot
1943: * at the end of the array, expanding if necessary.
1944: */
1945: env = *envp;
1946: namelen = strlen(name);
1947: for (i = 0; env[i]; i++)
1948: if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
1949: break;
1950: if (env[i]) {
1951: /* Reuse the slot. */
1952: free(env[i]);
1953: } else {
1954: /* New variable. Expand if necessary. */
1955: envsize = *envsizep;
1956: if (i >= envsize - 1) {
1957: if (envsize >= 1000)
1958: fatal("child_set_env: too many env vars");
1959: envsize += 50;
1960: env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
1961: *envsizep = envsize;
1962: }
1963: /* Need to set the NULL pointer at end of array beyond the new slot. */
1964: env[i + 1] = NULL;
1965: }
1966:
1967: /* Allocate space and format the variable in the appropriate slot. */
1.125 djm 1968: /* XXX xasprintf */
1.112 djm 1969: env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
1970: snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
1971: }
1972:
1.114 millert 1973: /*
1974: * Check and optionally lowercase a domain name, also removes trailing '.'
1975: * Returns 1 on success and 0 on failure, storing an error message in errstr.
1976: */
1977: int
1978: valid_domain(char *name, int makelower, const char **errstr)
1979: {
1980: size_t i, l = strlen(name);
1981: u_char c, last = '\0';
1982: static char errbuf[256];
1983:
1984: if (l == 0) {
1985: strlcpy(errbuf, "empty domain name", sizeof(errbuf));
1986: goto bad;
1987: }
1988: if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
1989: snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
1990: "starts with invalid character", name);
1991: goto bad;
1992: }
1993: for (i = 0; i < l; i++) {
1994: c = tolower((u_char)name[i]);
1995: if (makelower)
1996: name[i] = (char)c;
1997: if (last == '.' && c == '.') {
1998: snprintf(errbuf, sizeof(errbuf), "domain name "
1999: "\"%.100s\" contains consecutive separators", name);
2000: goto bad;
2001: }
2002: if (c != '.' && c != '-' && !isalnum(c) &&
2003: c != '_') /* technically invalid, but common */ {
2004: snprintf(errbuf, sizeof(errbuf), "domain name "
2005: "\"%.100s\" contains invalid characters", name);
2006: goto bad;
2007: }
2008: last = c;
2009: }
2010: if (name[l - 1] == '.')
2011: name[l - 1] = '\0';
2012: if (errstr != NULL)
2013: *errstr = NULL;
2014: return 1;
2015: bad:
2016: if (errstr != NULL)
2017: *errstr = errbuf;
2018: return 0;
1.132 djm 2019: }
2020:
2021: /*
2022: * Verify that a environment variable name (not including initial '$') is
2023: * valid; consisting of one or more alphanumeric or underscore characters only.
2024: * Returns 1 on valid, 0 otherwise.
2025: */
2026: int
2027: valid_env_name(const char *name)
2028: {
2029: const char *cp;
2030:
2031: if (name[0] == '\0')
2032: return 0;
2033: for (cp = name; *cp != '\0'; cp++) {
2034: if (!isalnum((u_char)*cp) && *cp != '_')
2035: return 0;
2036: }
2037: return 1;
1.120 dtucker 2038: }
2039:
2040: const char *
2041: atoi_err(const char *nptr, int *val)
2042: {
2043: const char *errstr = NULL;
2044: long long num;
2045:
2046: if (nptr == NULL || *nptr == '\0')
2047: return "missing";
2048: num = strtonum(nptr, 0, INT_MAX, &errstr);
2049: if (errstr == NULL)
2050: *val = (int)num;
2051: return errstr;
1.127 djm 2052: }
2053:
2054: int
2055: parse_absolute_time(const char *s, uint64_t *tp)
2056: {
2057: struct tm tm;
2058: time_t tt;
2059: char buf[32], *fmt;
2060:
2061: *tp = 0;
2062:
2063: /*
2064: * POSIX strptime says "The application shall ensure that there
2065: * is white-space or other non-alphanumeric characters between
2066: * any two conversion specifications" so arrange things this way.
2067: */
2068: switch (strlen(s)) {
2069: case 8: /* YYYYMMDD */
2070: fmt = "%Y-%m-%d";
2071: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
2072: break;
2073: case 12: /* YYYYMMDDHHMM */
2074: fmt = "%Y-%m-%dT%H:%M";
2075: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
2076: s, s + 4, s + 6, s + 8, s + 10);
2077: break;
2078: case 14: /* YYYYMMDDHHMMSS */
2079: fmt = "%Y-%m-%dT%H:%M:%S";
2080: snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
2081: s, s + 4, s + 6, s + 8, s + 10, s + 12);
2082: break;
2083: default:
2084: return SSH_ERR_INVALID_FORMAT;
2085: }
2086:
2087: memset(&tm, 0, sizeof(tm));
2088: if (strptime(buf, fmt, &tm) == NULL)
2089: return SSH_ERR_INVALID_FORMAT;
2090: if ((tt = mktime(&tm)) < 0)
2091: return SSH_ERR_INVALID_FORMAT;
2092: /* success */
2093: *tp = (uint64_t)tt;
2094: return 0;
2095: }
2096:
2097: void
2098: format_absolute_time(uint64_t t, char *buf, size_t len)
2099: {
2100: time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */
2101: struct tm tm;
2102:
2103: localtime_r(&tt, &tm);
2104: strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
1.134 djm 2105: }
2106:
2107: /* check if path is absolute */
2108: int
2109: path_absolute(const char *path)
2110: {
2111: return (*path == '/') ? 1 : 0;
1.141 djm 2112: }
2113:
2114: void
2115: skip_space(char **cpp)
2116: {
2117: char *cp;
2118:
2119: for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
2120: ;
2121: *cpp = cp;
1.114 millert 2122: }
1.142 djm 2123:
2124: /* authorized_key-style options parsing helpers */
2125:
2126: /*
2127: * Match flag 'opt' in *optsp, and if allow_negate is set then also match
2128: * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
2129: * if negated option matches.
2130: * If the option or negated option matches, then *optsp is updated to
2131: * point to the first character after the option.
2132: */
2133: int
2134: opt_flag(const char *opt, int allow_negate, const char **optsp)
2135: {
2136: size_t opt_len = strlen(opt);
2137: const char *opts = *optsp;
2138: int negate = 0;
2139:
2140: if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
2141: opts += 3;
2142: negate = 1;
2143: }
2144: if (strncasecmp(opts, opt, opt_len) == 0) {
2145: *optsp = opts + opt_len;
2146: return negate ? 0 : 1;
2147: }
2148: return -1;
2149: }
2150:
2151: char *
2152: opt_dequote(const char **sp, const char **errstrp)
2153: {
2154: const char *s = *sp;
2155: char *ret;
2156: size_t i;
2157:
2158: *errstrp = NULL;
2159: if (*s != '"') {
2160: *errstrp = "missing start quote";
2161: return NULL;
2162: }
2163: s++;
2164: if ((ret = malloc(strlen((s)) + 1)) == NULL) {
2165: *errstrp = "memory allocation failed";
2166: return NULL;
2167: }
2168: for (i = 0; *s != '\0' && *s != '"';) {
2169: if (s[0] == '\\' && s[1] == '"')
2170: s++;
2171: ret[i++] = *s++;
2172: }
2173: if (*s == '\0') {
2174: *errstrp = "missing end quote";
2175: free(ret);
2176: return NULL;
2177: }
2178: ret[i] = '\0';
2179: s++;
2180: *sp = s;
2181: return ret;
2182: }
2183:
2184: int
2185: opt_match(const char **opts, const char *term)
2186: {
2187: if (strncasecmp((*opts), term, strlen(term)) == 0 &&
2188: (*opts)[strlen(term)] == '=') {
2189: *opts += strlen(term) + 1;
2190: return 1;
2191: }
2192: return 0;
2193: }
2194:
1.144 dtucker 2195: sshsig_t
2196: ssh_signal(int signum, sshsig_t handler)
2197: {
2198: struct sigaction sa, osa;
2199:
2200: /* mask all other signals while in handler */
1.147 dtucker 2201: memset(&sa, 0, sizeof(sa));
1.144 dtucker 2202: sa.sa_handler = handler;
2203: sigfillset(&sa.sa_mask);
2204: if (signum != SIGALRM)
2205: sa.sa_flags = SA_RESTART;
2206: if (sigaction(signum, &sa, &osa) == -1) {
2207: debug3("sigaction(%s): %s", strsignal(signum), strerror(errno));
2208: return SIG_ERR;
2209: }
2210: return osa.sa_handler;
2211: }
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