1 /* $OpenBSD: misc.c,v 1.152 2020/05/29 11:17:56 dtucker Exp $ */ 2 /* 3 * Copyright (c) 2000 Markus Friedl. All rights reserved. 4 * Copyright (c) 2005-2020 Damien Miller. All rights reserved. 5 * Copyright (c) 2004 Henning Brauer <henning@openbsd.org> 6 * 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. 10 * 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. 18 */ 19 20 21 #include <sys/types.h> 22 #include <sys/ioctl.h> 23 #include <sys/socket.h> 24 #include <sys/stat.h> 25 #include <sys/time.h> 26 #include <sys/wait.h> 27 #include <sys/un.h> 28 29 #include <net/if.h> 30 #include <netinet/in.h> 31 #include <netinet/ip.h> 32 #include <netinet/tcp.h> 33 #include <arpa/inet.h> 34 35 #include <ctype.h> 36 #include <errno.h> 37 #include <fcntl.h> 38 #include <netdb.h> 39 #include <paths.h> 40 #include <pwd.h> 41 #include <libgen.h> 42 #include <limits.h> 43 #include <poll.h> 44 #include <signal.h> 45 #include <stdarg.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include "xmalloc.h" 52 #include "misc.h" 53 #include "log.h" 54 #include "ssh.h" 55 #include "sshbuf.h" 56 #include "ssherr.h" 57 58 /* remove newline at end of string */ 59 char * 60 chop(char *s) 61 { 62 char *t = s; 63 while (*t) { 64 if (*t == '\n' || *t == '\r') { 65 *t = '\0'; 66 return s; 67 } 68 t++; 69 } 70 return s; 71 72 } 73 74 /* set/unset filedescriptor to non-blocking */ 75 int 76 set_nonblock(int fd) 77 { 78 int val; 79 80 val = fcntl(fd, F_GETFL); 81 if (val == -1) { 82 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 83 return (-1); 84 } 85 if (val & O_NONBLOCK) { 86 debug3("fd %d is O_NONBLOCK", fd); 87 return (0); 88 } 89 debug2("fd %d setting O_NONBLOCK", fd); 90 val |= O_NONBLOCK; 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); 97 } 98 99 int 100 unset_nonblock(int fd) 101 { 102 int val; 103 104 val = fcntl(fd, F_GETFL); 105 if (val == -1) { 106 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 107 return (-1); 108 } 109 if (!(val & O_NONBLOCK)) { 110 debug3("fd %d is not O_NONBLOCK", fd); 111 return (0); 112 } 113 debug("fd %d clearing O_NONBLOCK", fd); 114 val &= ~O_NONBLOCK; 115 if (fcntl(fd, F_SETFL, val) == -1) { 116 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 117 fd, strerror(errno)); 118 return (-1); 119 } 120 return (0); 121 } 122 123 const char * 124 ssh_gai_strerror(int gaierr) 125 { 126 if (gaierr == EAI_SYSTEM && errno != 0) 127 return strerror(errno); 128 return gai_strerror(gaierr); 129 } 130 131 /* disable nagle on socket */ 132 void 133 set_nodelay(int fd) 134 { 135 int opt; 136 socklen_t optlen; 137 138 optlen = sizeof opt; 139 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 140 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 141 return; 142 } 143 if (opt == 1) { 144 debug2("fd %d is TCP_NODELAY", fd); 145 return; 146 } 147 opt = 1; 148 debug2("fd %d setting TCP_NODELAY", fd); 149 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 150 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 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 } 165 166 /* 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 } 182 183 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 } 204 return 0; 205 } 206 207 /* 208 * Wait up to *timeoutp milliseconds for events on fd. Updates 209 * *timeoutp with time remaining. 210 * Returns 0 if fd ready or -1 on timeout or error (see errno). 211 */ 212 static int 213 waitfd(int fd, int *timeoutp, short events) 214 { 215 struct pollfd pfd; 216 struct timeval t_start; 217 int oerrno, r; 218 219 monotime_tv(&t_start); 220 pfd.fd = fd; 221 pfd.events = events; 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 /* 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 /* 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; 274 275 if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1) 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); 288 return 0; 289 } 290 291 /* Characters considered whitespace in strsep calls. */ 292 #define WHITESPACE " \t\r\n" 293 #define QUOTE "\"" 294 295 /* return next token in configuration line */ 296 static char * 297 strdelim_internal(char **s, int split_equals) 298 { 299 char *old; 300 int wspace = 0; 301 302 if (*s == NULL) 303 return NULL; 304 305 old = *s; 306 307 *s = strpbrk(*s, 308 split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE); 309 if (*s == NULL) 310 return (old); 311 312 if (*s[0] == '\"') { 313 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 314 /* Find matching quote */ 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); 321 } 322 } 323 324 /* Allow only one '=' to be skipped */ 325 if (split_equals && *s[0] == '=') 326 wspace = 1; 327 *s[0] = '\0'; 328 329 /* Skip any extra whitespace after first token */ 330 *s += strspn(*s + 1, WHITESPACE) + 1; 331 if (split_equals && *s[0] == '=' && !wspace) 332 *s += strspn(*s + 1, WHITESPACE) + 1; 333 334 return (old); 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); 354 } 355 356 struct passwd * 357 pwcopy(struct passwd *pw) 358 { 359 struct passwd *copy = xcalloc(1, sizeof(*copy)); 360 361 copy->pw_name = xstrdup(pw->pw_name); 362 copy->pw_passwd = xstrdup(pw->pw_passwd); 363 copy->pw_gecos = xstrdup(pw->pw_gecos); 364 copy->pw_uid = pw->pw_uid; 365 copy->pw_gid = pw->pw_gid; 366 copy->pw_expire = pw->pw_expire; 367 copy->pw_change = pw->pw_change; 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; 372 } 373 374 /* 375 * Convert ASCII string to TCP/IP port number. 376 * Port must be >=0 and <=65535. 377 * Return -1 if invalid. 378 */ 379 int 380 a2port(const char *s) 381 { 382 struct servent *se; 383 long long port; 384 const char *errstr; 385 386 port = strtonum(s, 0, 65535, &errstr); 387 if (errstr == NULL) 388 return (int)port; 389 if ((se = getservbyname(s, "tcp")) != NULL) 390 return ntohs(se->s_port); 391 return -1; 392 } 393 394 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) { 402 *remote = SSH_TUNID_ANY; 403 sp = xstrdup(s); 404 if ((ep = strchr(sp, ':')) == NULL) { 405 free(sp); 406 return (a2tun(s, NULL)); 407 } 408 ep[0] = '\0'; ep++; 409 *remote = a2tun(ep, NULL); 410 tun = a2tun(sp, NULL); 411 free(sp); 412 return (*remote == SSH_TUNID_ERR ? *remote : tun); 413 } 414 415 if (strcasecmp(s, "any") == 0) 416 return (SSH_TUNID_ANY); 417 418 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 419 if (errstr != NULL) 420 return (SSH_TUNID_ERR); 421 422 return (tun); 423 } 424 425 #define SECONDS 1 426 #define MINUTES (SECONDS * 60) 427 #define HOURS (MINUTES * 60) 428 #define DAYS (HOURS * 24) 429 #define WEEKS (DAYS * 7) 430 431 /* 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) 454 { 455 long total, secs, multiplier; 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 multiplier = 1; 474 switch (*endp++) { 475 case '\0': 476 endp--; 477 break; 478 case 's': 479 case 'S': 480 break; 481 case 'm': 482 case 'M': 483 multiplier = MINUTES; 484 break; 485 case 'h': 486 case 'H': 487 multiplier = HOURS; 488 break; 489 case 'd': 490 case 'D': 491 multiplier = DAYS; 492 break; 493 case 'w': 494 case 'W': 495 multiplier = WEEKS; 496 break; 497 default: 498 return -1; 499 } 500 if (secs >= LONG_MAX / multiplier) 501 return -1; 502 secs *= multiplier; 503 if (total >= LONG_MAX - secs) 504 return -1; 505 total += secs; 506 if (total < 0) 507 return -1; 508 p = endp; 509 } 510 511 return total; 512 } 513 514 #define TF_BUFS 8 515 #define TF_LEN 9 516 517 const char * 518 fmt_timeframe(time_t t) 519 { 520 char *buf; 521 static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */ 522 static int idx = 0; 523 unsigned int sec, min, hrs, day; 524 unsigned long long week; 525 526 buf = tfbuf[idx++]; 527 if (idx == TF_BUFS) 528 idx = 0; 529 530 week = t; 531 532 sec = week % 60; 533 week /= 60; 534 min = week % 60; 535 week /= 60; 536 hrs = week % 24; 537 week /= 24; 538 day = week % 7; 539 week /= 7; 540 541 if (week > 0) 542 snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs); 543 else if (day > 0) 544 snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min); 545 else 546 snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec); 547 548 return (buf); 549 } 550 551 /* 552 * Returns a standardized host+port identifier string. 553 * Caller must free returned string. 554 */ 555 char * 556 put_host_port(const char *host, u_short port) 557 { 558 char *hoststr; 559 560 if (port == 0 || port == SSH_DEFAULT_PORT) 561 return(xstrdup(host)); 562 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1) 563 fatal("put_host_port: asprintf: %s", strerror(errno)); 564 debug3("put_host_port: %s", hoststr); 565 return hoststr; 566 } 567 568 /* 569 * Search for next delimiter between hostnames/addresses and ports. 570 * Argument may be modified (for termination). 571 * Returns *cp if parsing succeeds. 572 * *cp is set to the start of the next field, if one was found. 573 * The delimiter char, if present, is stored in delim. 574 * If this is the last field, *cp is set to NULL. 575 */ 576 char * 577 hpdelim2(char **cp, char *delim) 578 { 579 char *s, *old; 580 581 if (cp == NULL || *cp == NULL) 582 return NULL; 583 584 old = s = *cp; 585 if (*s == '[') { 586 if ((s = strchr(s, ']')) == NULL) 587 return NULL; 588 else 589 s++; 590 } else if ((s = strpbrk(s, ":/")) == NULL) 591 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 592 593 switch (*s) { 594 case '\0': 595 *cp = NULL; /* no more fields*/ 596 break; 597 598 case ':': 599 case '/': 600 if (delim != NULL) 601 *delim = *s; 602 *s = '\0'; /* terminate */ 603 *cp = s + 1; 604 break; 605 606 default: 607 return NULL; 608 } 609 610 return old; 611 } 612 613 char * 614 hpdelim(char **cp) 615 { 616 return hpdelim2(cp, NULL); 617 } 618 619 char * 620 cleanhostname(char *host) 621 { 622 if (*host == '[' && host[strlen(host) - 1] == ']') { 623 host[strlen(host) - 1] = '\0'; 624 return (host + 1); 625 } else 626 return host; 627 } 628 629 char * 630 colon(char *cp) 631 { 632 int flag = 0; 633 634 if (*cp == ':') /* Leading colon is part of file name. */ 635 return NULL; 636 if (*cp == '[') 637 flag = 1; 638 639 for (; *cp; ++cp) { 640 if (*cp == '@' && *(cp+1) == '[') 641 flag = 1; 642 if (*cp == ']' && *(cp+1) == ':' && flag) 643 return (cp+1); 644 if (*cp == ':' && !flag) 645 return (cp); 646 if (*cp == '/') 647 return NULL; 648 } 649 return NULL; 650 } 651 652 /* 653 * Parse a [user@]host:[path] string. 654 * Caller must free returned user, host and path. 655 * Any of the pointer return arguments may be NULL (useful for syntax checking). 656 * If user was not specified then *userp will be set to NULL. 657 * If host was not specified then *hostp will be set to NULL. 658 * If path was not specified then *pathp will be set to ".". 659 * Returns 0 on success, -1 on failure. 660 */ 661 int 662 parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) 663 { 664 char *user = NULL, *host = NULL, *path = NULL; 665 char *sdup, *tmp; 666 int ret = -1; 667 668 if (userp != NULL) 669 *userp = NULL; 670 if (hostp != NULL) 671 *hostp = NULL; 672 if (pathp != NULL) 673 *pathp = NULL; 674 675 sdup = xstrdup(s); 676 677 /* Check for remote syntax: [user@]host:[path] */ 678 if ((tmp = colon(sdup)) == NULL) 679 goto out; 680 681 /* Extract optional path */ 682 *tmp++ = '\0'; 683 if (*tmp == '\0') 684 tmp = "."; 685 path = xstrdup(tmp); 686 687 /* Extract optional user and mandatory host */ 688 tmp = strrchr(sdup, '@'); 689 if (tmp != NULL) { 690 *tmp++ = '\0'; 691 host = xstrdup(cleanhostname(tmp)); 692 if (*sdup != '\0') 693 user = xstrdup(sdup); 694 } else { 695 host = xstrdup(cleanhostname(sdup)); 696 user = NULL; 697 } 698 699 /* Success */ 700 if (userp != NULL) { 701 *userp = user; 702 user = NULL; 703 } 704 if (hostp != NULL) { 705 *hostp = host; 706 host = NULL; 707 } 708 if (pathp != NULL) { 709 *pathp = path; 710 path = NULL; 711 } 712 ret = 0; 713 out: 714 free(sdup); 715 free(user); 716 free(host); 717 free(path); 718 return ret; 719 } 720 721 /* 722 * Parse a [user@]host[:port] string. 723 * Caller must free returned user and host. 724 * Any of the pointer return arguments may be NULL (useful for syntax checking). 725 * If user was not specified then *userp will be set to NULL. 726 * If port was not specified then *portp will be -1. 727 * Returns 0 on success, -1 on failure. 728 */ 729 int 730 parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) 731 { 732 char *sdup, *cp, *tmp; 733 char *user = NULL, *host = NULL; 734 int port = -1, ret = -1; 735 736 if (userp != NULL) 737 *userp = NULL; 738 if (hostp != NULL) 739 *hostp = NULL; 740 if (portp != NULL) 741 *portp = -1; 742 743 if ((sdup = tmp = strdup(s)) == NULL) 744 return -1; 745 /* Extract optional username */ 746 if ((cp = strrchr(tmp, '@')) != NULL) { 747 *cp = '\0'; 748 if (*tmp == '\0') 749 goto out; 750 if ((user = strdup(tmp)) == NULL) 751 goto out; 752 tmp = cp + 1; 753 } 754 /* Extract mandatory hostname */ 755 if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') 756 goto out; 757 host = xstrdup(cleanhostname(cp)); 758 /* Convert and verify optional port */ 759 if (tmp != NULL && *tmp != '\0') { 760 if ((port = a2port(tmp)) <= 0) 761 goto out; 762 } 763 /* Success */ 764 if (userp != NULL) { 765 *userp = user; 766 user = NULL; 767 } 768 if (hostp != NULL) { 769 *hostp = host; 770 host = NULL; 771 } 772 if (portp != NULL) 773 *portp = port; 774 ret = 0; 775 out: 776 free(sdup); 777 free(user); 778 free(host); 779 return ret; 780 } 781 782 /* 783 * Converts a two-byte hex string to decimal. 784 * Returns the decimal value or -1 for invalid input. 785 */ 786 static int 787 hexchar(const char *s) 788 { 789 unsigned char result[2]; 790 int i; 791 792 for (i = 0; i < 2; i++) { 793 if (s[i] >= '0' && s[i] <= '9') 794 result[i] = (unsigned char)(s[i] - '0'); 795 else if (s[i] >= 'a' && s[i] <= 'f') 796 result[i] = (unsigned char)(s[i] - 'a') + 10; 797 else if (s[i] >= 'A' && s[i] <= 'F') 798 result[i] = (unsigned char)(s[i] - 'A') + 10; 799 else 800 return -1; 801 } 802 return (result[0] << 4) | result[1]; 803 } 804 805 /* 806 * Decode an url-encoded string. 807 * Returns a newly allocated string on success or NULL on failure. 808 */ 809 static char * 810 urldecode(const char *src) 811 { 812 char *ret, *dst; 813 int ch; 814 815 ret = xmalloc(strlen(src) + 1); 816 for (dst = ret; *src != '\0'; src++) { 817 switch (*src) { 818 case '+': 819 *dst++ = ' '; 820 break; 821 case '%': 822 if (!isxdigit((unsigned char)src[1]) || 823 !isxdigit((unsigned char)src[2]) || 824 (ch = hexchar(src + 1)) == -1) { 825 free(ret); 826 return NULL; 827 } 828 *dst++ = ch; 829 src += 2; 830 break; 831 default: 832 *dst++ = *src; 833 break; 834 } 835 } 836 *dst = '\0'; 837 838 return ret; 839 } 840 841 /* 842 * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. 843 * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 844 * Either user or path may be url-encoded (but not host or port). 845 * Caller must free returned user, host and path. 846 * Any of the pointer return arguments may be NULL (useful for syntax checking) 847 * but the scheme must always be specified. 848 * If user was not specified then *userp will be set to NULL. 849 * If port was not specified then *portp will be -1. 850 * If path was not specified then *pathp will be set to NULL. 851 * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. 852 */ 853 int 854 parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, 855 int *portp, char **pathp) 856 { 857 char *uridup, *cp, *tmp, ch; 858 char *user = NULL, *host = NULL, *path = NULL; 859 int port = -1, ret = -1; 860 size_t len; 861 862 len = strlen(scheme); 863 if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) 864 return 1; 865 uri += len + 3; 866 867 if (userp != NULL) 868 *userp = NULL; 869 if (hostp != NULL) 870 *hostp = NULL; 871 if (portp != NULL) 872 *portp = -1; 873 if (pathp != NULL) 874 *pathp = NULL; 875 876 uridup = tmp = xstrdup(uri); 877 878 /* Extract optional ssh-info (username + connection params) */ 879 if ((cp = strchr(tmp, '@')) != NULL) { 880 char *delim; 881 882 *cp = '\0'; 883 /* Extract username and connection params */ 884 if ((delim = strchr(tmp, ';')) != NULL) { 885 /* Just ignore connection params for now */ 886 *delim = '\0'; 887 } 888 if (*tmp == '\0') { 889 /* Empty username */ 890 goto out; 891 } 892 if ((user = urldecode(tmp)) == NULL) 893 goto out; 894 tmp = cp + 1; 895 } 896 897 /* Extract mandatory hostname */ 898 if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0') 899 goto out; 900 host = xstrdup(cleanhostname(cp)); 901 if (!valid_domain(host, 0, NULL)) 902 goto out; 903 904 if (tmp != NULL && *tmp != '\0') { 905 if (ch == ':') { 906 /* Convert and verify port. */ 907 if ((cp = strchr(tmp, '/')) != NULL) 908 *cp = '\0'; 909 if ((port = a2port(tmp)) <= 0) 910 goto out; 911 tmp = cp ? cp + 1 : NULL; 912 } 913 if (tmp != NULL && *tmp != '\0') { 914 /* Extract optional path */ 915 if ((path = urldecode(tmp)) == NULL) 916 goto out; 917 } 918 } 919 920 /* Success */ 921 if (userp != NULL) { 922 *userp = user; 923 user = NULL; 924 } 925 if (hostp != NULL) { 926 *hostp = host; 927 host = NULL; 928 } 929 if (portp != NULL) 930 *portp = port; 931 if (pathp != NULL) { 932 *pathp = path; 933 path = NULL; 934 } 935 ret = 0; 936 out: 937 free(uridup); 938 free(user); 939 free(host); 940 free(path); 941 return ret; 942 } 943 944 /* function to assist building execv() arguments */ 945 void 946 addargs(arglist *args, char *fmt, ...) 947 { 948 va_list ap; 949 char *cp; 950 u_int nalloc; 951 int r; 952 953 va_start(ap, fmt); 954 r = vasprintf(&cp, fmt, ap); 955 va_end(ap); 956 if (r == -1) 957 fatal("addargs: argument too long"); 958 959 nalloc = args->nalloc; 960 if (args->list == NULL) { 961 nalloc = 32; 962 args->num = 0; 963 } else if (args->num+2 >= nalloc) 964 nalloc *= 2; 965 966 args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *)); 967 args->nalloc = nalloc; 968 args->list[args->num++] = cp; 969 args->list[args->num] = NULL; 970 } 971 972 void 973 replacearg(arglist *args, u_int which, char *fmt, ...) 974 { 975 va_list ap; 976 char *cp; 977 int r; 978 979 va_start(ap, fmt); 980 r = vasprintf(&cp, fmt, ap); 981 va_end(ap); 982 if (r == -1) 983 fatal("replacearg: argument too long"); 984 985 if (which >= args->num) 986 fatal("replacearg: tried to replace invalid arg %d >= %d", 987 which, args->num); 988 free(args->list[which]); 989 args->list[which] = cp; 990 } 991 992 void 993 freeargs(arglist *args) 994 { 995 u_int i; 996 997 if (args->list != NULL) { 998 for (i = 0; i < args->num; i++) 999 free(args->list[i]); 1000 free(args->list); 1001 args->nalloc = args->num = 0; 1002 args->list = NULL; 1003 } 1004 } 1005 1006 /* 1007 * Expands tildes in the file name. Returns data allocated by xmalloc. 1008 * Warning: this calls getpw*. 1009 */ 1010 char * 1011 tilde_expand_filename(const char *filename, uid_t uid) 1012 { 1013 const char *path, *sep; 1014 char user[128], *ret; 1015 struct passwd *pw; 1016 u_int len, slash; 1017 1018 if (*filename != '~') 1019 return (xstrdup(filename)); 1020 filename++; 1021 1022 path = strchr(filename, '/'); 1023 if (path != NULL && path > filename) { /* ~user/path */ 1024 slash = path - filename; 1025 if (slash > sizeof(user) - 1) 1026 fatal("tilde_expand_filename: ~username too long"); 1027 memcpy(user, filename, slash); 1028 user[slash] = '\0'; 1029 if ((pw = getpwnam(user)) == NULL) 1030 fatal("tilde_expand_filename: No such user %s", user); 1031 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 1032 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 1033 1034 /* Make sure directory has a trailing '/' */ 1035 len = strlen(pw->pw_dir); 1036 if (len == 0 || pw->pw_dir[len - 1] != '/') 1037 sep = "/"; 1038 else 1039 sep = ""; 1040 1041 /* Skip leading '/' from specified path */ 1042 if (path != NULL) 1043 filename = path + 1; 1044 1045 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) 1046 fatal("tilde_expand_filename: Path too long"); 1047 1048 return (ret); 1049 } 1050 1051 /* 1052 * Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT} 1053 * substitutions. A number of escapes may be specified as 1054 * (char *escape_chars, char *replacement) pairs. The list must be terminated 1055 * by a NULL escape_char. Returns replaced string in memory allocated by 1056 * xmalloc which the caller must free. 1057 */ 1058 static char * 1059 vdollar_percent_expand(int *parseerror, int dollar, int percent, 1060 const char *string, va_list ap) 1061 { 1062 #define EXPAND_MAX_KEYS 16 1063 u_int num_keys = 0, i; 1064 struct { 1065 const char *key; 1066 const char *repl; 1067 } keys[EXPAND_MAX_KEYS]; 1068 struct sshbuf *buf; 1069 int r, missingvar = 0; 1070 char *ret = NULL, *var, *varend, *val; 1071 size_t len; 1072 1073 if ((buf = sshbuf_new()) == NULL) 1074 fatal("%s: sshbuf_new failed", __func__); 1075 if (parseerror == NULL) 1076 fatal("%s: null parseerror arg", __func__); 1077 *parseerror = 1; 1078 1079 /* Gather keys if we're doing percent expansion. */ 1080 if (percent) { 1081 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 1082 keys[num_keys].key = va_arg(ap, char *); 1083 if (keys[num_keys].key == NULL) 1084 break; 1085 keys[num_keys].repl = va_arg(ap, char *); 1086 if (keys[num_keys].repl == NULL) 1087 fatal("%s: NULL replacement for token %s", __func__, keys[num_keys].key); 1088 } 1089 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 1090 fatal("%s: too many keys", __func__); 1091 if (num_keys == 0) 1092 fatal("%s: percent expansion without token list", 1093 __func__); 1094 } 1095 1096 /* Expand string */ 1097 for (i = 0; *string != '\0'; string++) { 1098 /* Optionally process ${ENVIRONMENT} expansions. */ 1099 if (dollar && string[0] == '$' && string[1] == '{') { 1100 string += 2; /* skip over '${' */ 1101 if ((varend = strchr(string, '}')) == NULL) { 1102 error("%s: environment variable '%s' missing " 1103 "closing '}'", __func__, string); 1104 goto out; 1105 } 1106 len = varend - string; 1107 if (len == 0) { 1108 error("%s: zero-length environment variable", 1109 __func__); 1110 goto out; 1111 } 1112 var = xmalloc(len + 1); 1113 (void)strlcpy(var, string, len + 1); 1114 if ((val = getenv(var)) == NULL) { 1115 error("%s: env var ${%s} has no value", 1116 __func__, var); 1117 missingvar = 1; 1118 } else { 1119 debug3("%s: expand ${%s} -> '%s'", __func__, 1120 var, val); 1121 if ((r = sshbuf_put(buf, val, strlen(val))) !=0) 1122 fatal("%s: sshbuf_put: %s", __func__, 1123 ssh_err(r)); 1124 } 1125 free(var); 1126 string += len; 1127 continue; 1128 } 1129 1130 /* 1131 * Process percent expansions if we have a list of TOKENs. 1132 * If we're not doing percent expansion everything just gets 1133 * appended here. 1134 */ 1135 if (*string != '%' || !percent) { 1136 append: 1137 if ((r = sshbuf_put_u8(buf, *string)) != 0) { 1138 fatal("%s: sshbuf_put_u8: %s", 1139 __func__, ssh_err(r)); 1140 } 1141 continue; 1142 } 1143 string++; 1144 /* %% case */ 1145 if (*string == '%') 1146 goto append; 1147 if (*string == '\0') { 1148 error("%s: invalid format", __func__); 1149 goto out; 1150 } 1151 for (i = 0; i < num_keys; i++) { 1152 if (strchr(keys[i].key, *string) != NULL) { 1153 if ((r = sshbuf_put(buf, keys[i].repl, 1154 strlen(keys[i].repl))) != 0) { 1155 fatal("%s: sshbuf_put: %s", 1156 __func__, ssh_err(r)); 1157 } 1158 break; 1159 } 1160 } 1161 if (i >= num_keys) { 1162 error("%s: unknown key %%%c", __func__, *string); 1163 goto out; 1164 } 1165 } 1166 if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL) 1167 fatal("%s: sshbuf_dup_string failed", __func__); 1168 *parseerror = 0; 1169 out: 1170 sshbuf_free(buf); 1171 return *parseerror ? NULL : ret; 1172 #undef EXPAND_MAX_KEYS 1173 } 1174 1175 /* 1176 * Expand only environment variables. 1177 * Note that although this function is variadic like the other similar 1178 * functions, any such arguments will be unused. 1179 */ 1180 1181 char * 1182 dollar_expand(int *parseerr, const char *string, ...) 1183 { 1184 char *ret; 1185 int err; 1186 va_list ap; 1187 1188 va_start(ap, string); 1189 ret = vdollar_percent_expand(&err, 1, 0, string, ap); 1190 va_end(ap); 1191 if (parseerr != NULL) 1192 *parseerr = err; 1193 return ret; 1194 } 1195 1196 /* 1197 * Returns expanded string or NULL if a specified environment variable is 1198 * not defined, or calls fatal if the string is invalid. 1199 */ 1200 char * 1201 percent_expand(const char *string, ...) 1202 { 1203 char *ret; 1204 int err; 1205 va_list ap; 1206 1207 va_start(ap, string); 1208 ret = vdollar_percent_expand(&err, 0, 1, string, ap); 1209 va_end(ap); 1210 if (err) 1211 fatal("%s failed", __func__); 1212 return ret; 1213 } 1214 1215 /* 1216 * Returns expanded string or NULL if a specified environment variable is 1217 * not defined, or calls fatal if the string is invalid. 1218 */ 1219 char * 1220 percent_dollar_expand(const char *string, ...) 1221 { 1222 char *ret; 1223 int err; 1224 va_list ap; 1225 1226 va_start(ap, string); 1227 ret = vdollar_percent_expand(&err, 1, 1, string, ap); 1228 va_end(ap); 1229 if (err) 1230 fatal("%s failed", __func__); 1231 return ret; 1232 } 1233 1234 int 1235 tun_open(int tun, int mode, char **ifname) 1236 { 1237 struct ifreq ifr; 1238 char name[100]; 1239 int fd = -1, sock; 1240 const char *tunbase = "tun"; 1241 1242 if (ifname != NULL) 1243 *ifname = NULL; 1244 1245 if (mode == SSH_TUNMODE_ETHERNET) 1246 tunbase = "tap"; 1247 1248 /* Open the tunnel device */ 1249 if (tun <= SSH_TUNID_MAX) { 1250 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); 1251 fd = open(name, O_RDWR); 1252 } else if (tun == SSH_TUNID_ANY) { 1253 for (tun = 100; tun >= 0; tun--) { 1254 snprintf(name, sizeof(name), "/dev/%s%d", 1255 tunbase, tun); 1256 if ((fd = open(name, O_RDWR)) >= 0) 1257 break; 1258 } 1259 } else { 1260 debug("%s: invalid tunnel %u", __func__, tun); 1261 return -1; 1262 } 1263 1264 if (fd == -1) { 1265 debug("%s: %s open: %s", __func__, name, strerror(errno)); 1266 return -1; 1267 } 1268 1269 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 1270 1271 /* Bring interface up if it is not already */ 1272 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); 1273 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 1274 goto failed; 1275 1276 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { 1277 debug("%s: get interface %s flags: %s", __func__, 1278 ifr.ifr_name, strerror(errno)); 1279 goto failed; 1280 } 1281 1282 if (!(ifr.ifr_flags & IFF_UP)) { 1283 ifr.ifr_flags |= IFF_UP; 1284 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { 1285 debug("%s: activate interface %s: %s", __func__, 1286 ifr.ifr_name, strerror(errno)); 1287 goto failed; 1288 } 1289 } 1290 1291 if (ifname != NULL) 1292 *ifname = xstrdup(ifr.ifr_name); 1293 1294 close(sock); 1295 return fd; 1296 1297 failed: 1298 if (fd >= 0) 1299 close(fd); 1300 if (sock >= 0) 1301 close(sock); 1302 return -1; 1303 } 1304 1305 void 1306 sanitise_stdfd(void) 1307 { 1308 int nullfd, dupfd; 1309 1310 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 1311 fprintf(stderr, "Couldn't open /dev/null: %s\n", 1312 strerror(errno)); 1313 exit(1); 1314 } 1315 while (++dupfd <= STDERR_FILENO) { 1316 /* Only populate closed fds. */ 1317 if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { 1318 if (dup2(nullfd, dupfd) == -1) { 1319 fprintf(stderr, "dup2: %s\n", strerror(errno)); 1320 exit(1); 1321 } 1322 } 1323 } 1324 if (nullfd > STDERR_FILENO) 1325 close(nullfd); 1326 } 1327 1328 char * 1329 tohex(const void *vp, size_t l) 1330 { 1331 const u_char *p = (const u_char *)vp; 1332 char b[3], *r; 1333 size_t i, hl; 1334 1335 if (l > 65536) 1336 return xstrdup("tohex: length > 65536"); 1337 1338 hl = l * 2 + 1; 1339 r = xcalloc(1, hl); 1340 for (i = 0; i < l; i++) { 1341 snprintf(b, sizeof(b), "%02x", p[i]); 1342 strlcat(r, b, hl); 1343 } 1344 return (r); 1345 } 1346 1347 /* 1348 * Extend string *sp by the specified format. If *sp is not NULL (or empty), 1349 * then the separator 'sep' will be prepended before the formatted arguments. 1350 * Extended strings are heap allocated. 1351 */ 1352 void 1353 xextendf(char **sp, const char *sep, const char *fmt, ...) 1354 { 1355 va_list ap; 1356 char *tmp1, *tmp2; 1357 1358 va_start(ap, fmt); 1359 xvasprintf(&tmp1, fmt, ap); 1360 va_end(ap); 1361 1362 if (*sp == NULL || **sp == '\0') { 1363 free(*sp); 1364 *sp = tmp1; 1365 return; 1366 } 1367 xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1); 1368 free(tmp1); 1369 free(*sp); 1370 *sp = tmp2; 1371 } 1372 1373 1374 u_int64_t 1375 get_u64(const void *vp) 1376 { 1377 const u_char *p = (const u_char *)vp; 1378 u_int64_t v; 1379 1380 v = (u_int64_t)p[0] << 56; 1381 v |= (u_int64_t)p[1] << 48; 1382 v |= (u_int64_t)p[2] << 40; 1383 v |= (u_int64_t)p[3] << 32; 1384 v |= (u_int64_t)p[4] << 24; 1385 v |= (u_int64_t)p[5] << 16; 1386 v |= (u_int64_t)p[6] << 8; 1387 v |= (u_int64_t)p[7]; 1388 1389 return (v); 1390 } 1391 1392 u_int32_t 1393 get_u32(const void *vp) 1394 { 1395 const u_char *p = (const u_char *)vp; 1396 u_int32_t v; 1397 1398 v = (u_int32_t)p[0] << 24; 1399 v |= (u_int32_t)p[1] << 16; 1400 v |= (u_int32_t)p[2] << 8; 1401 v |= (u_int32_t)p[3]; 1402 1403 return (v); 1404 } 1405 1406 u_int32_t 1407 get_u32_le(const void *vp) 1408 { 1409 const u_char *p = (const u_char *)vp; 1410 u_int32_t v; 1411 1412 v = (u_int32_t)p[0]; 1413 v |= (u_int32_t)p[1] << 8; 1414 v |= (u_int32_t)p[2] << 16; 1415 v |= (u_int32_t)p[3] << 24; 1416 1417 return (v); 1418 } 1419 1420 u_int16_t 1421 get_u16(const void *vp) 1422 { 1423 const u_char *p = (const u_char *)vp; 1424 u_int16_t v; 1425 1426 v = (u_int16_t)p[0] << 8; 1427 v |= (u_int16_t)p[1]; 1428 1429 return (v); 1430 } 1431 1432 void 1433 put_u64(void *vp, u_int64_t v) 1434 { 1435 u_char *p = (u_char *)vp; 1436 1437 p[0] = (u_char)(v >> 56) & 0xff; 1438 p[1] = (u_char)(v >> 48) & 0xff; 1439 p[2] = (u_char)(v >> 40) & 0xff; 1440 p[3] = (u_char)(v >> 32) & 0xff; 1441 p[4] = (u_char)(v >> 24) & 0xff; 1442 p[5] = (u_char)(v >> 16) & 0xff; 1443 p[6] = (u_char)(v >> 8) & 0xff; 1444 p[7] = (u_char)v & 0xff; 1445 } 1446 1447 void 1448 put_u32(void *vp, u_int32_t v) 1449 { 1450 u_char *p = (u_char *)vp; 1451 1452 p[0] = (u_char)(v >> 24) & 0xff; 1453 p[1] = (u_char)(v >> 16) & 0xff; 1454 p[2] = (u_char)(v >> 8) & 0xff; 1455 p[3] = (u_char)v & 0xff; 1456 } 1457 1458 void 1459 put_u32_le(void *vp, u_int32_t v) 1460 { 1461 u_char *p = (u_char *)vp; 1462 1463 p[0] = (u_char)v & 0xff; 1464 p[1] = (u_char)(v >> 8) & 0xff; 1465 p[2] = (u_char)(v >> 16) & 0xff; 1466 p[3] = (u_char)(v >> 24) & 0xff; 1467 } 1468 1469 void 1470 put_u16(void *vp, u_int16_t v) 1471 { 1472 u_char *p = (u_char *)vp; 1473 1474 p[0] = (u_char)(v >> 8) & 0xff; 1475 p[1] = (u_char)v & 0xff; 1476 } 1477 1478 void 1479 ms_subtract_diff(struct timeval *start, int *ms) 1480 { 1481 struct timeval diff, finish; 1482 1483 monotime_tv(&finish); 1484 timersub(&finish, start, &diff); 1485 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 1486 } 1487 1488 void 1489 ms_to_timeval(struct timeval *tv, int ms) 1490 { 1491 if (ms < 0) 1492 ms = 0; 1493 tv->tv_sec = ms / 1000; 1494 tv->tv_usec = (ms % 1000) * 1000; 1495 } 1496 1497 void 1498 monotime_ts(struct timespec *ts) 1499 { 1500 if (clock_gettime(CLOCK_MONOTONIC, ts) != 0) 1501 fatal("clock_gettime: %s", strerror(errno)); 1502 } 1503 1504 void 1505 monotime_tv(struct timeval *tv) 1506 { 1507 struct timespec ts; 1508 1509 monotime_ts(&ts); 1510 tv->tv_sec = ts.tv_sec; 1511 tv->tv_usec = ts.tv_nsec / 1000; 1512 } 1513 1514 time_t 1515 monotime(void) 1516 { 1517 struct timespec ts; 1518 1519 monotime_ts(&ts); 1520 return (ts.tv_sec); 1521 } 1522 1523 double 1524 monotime_double(void) 1525 { 1526 struct timespec ts; 1527 1528 monotime_ts(&ts); 1529 return (double)ts.tv_sec + (double)ts.tv_nsec / 1000000000.0; 1530 } 1531 1532 void 1533 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 1534 { 1535 bw->buflen = buflen; 1536 bw->rate = kbps; 1537 bw->thresh = buflen; 1538 bw->lamt = 0; 1539 timerclear(&bw->bwstart); 1540 timerclear(&bw->bwend); 1541 } 1542 1543 /* Callback from read/write loop to insert bandwidth-limiting delays */ 1544 void 1545 bandwidth_limit(struct bwlimit *bw, size_t read_len) 1546 { 1547 u_int64_t waitlen; 1548 struct timespec ts, rm; 1549 1550 bw->lamt += read_len; 1551 if (!timerisset(&bw->bwstart)) { 1552 monotime_tv(&bw->bwstart); 1553 return; 1554 } 1555 if (bw->lamt < bw->thresh) 1556 return; 1557 1558 monotime_tv(&bw->bwend); 1559 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 1560 if (!timerisset(&bw->bwend)) 1561 return; 1562 1563 bw->lamt *= 8; 1564 waitlen = (double)1000000L * bw->lamt / bw->rate; 1565 1566 bw->bwstart.tv_sec = waitlen / 1000000L; 1567 bw->bwstart.tv_usec = waitlen % 1000000L; 1568 1569 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 1570 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 1571 1572 /* Adjust the wait time */ 1573 if (bw->bwend.tv_sec) { 1574 bw->thresh /= 2; 1575 if (bw->thresh < bw->buflen / 4) 1576 bw->thresh = bw->buflen / 4; 1577 } else if (bw->bwend.tv_usec < 10000) { 1578 bw->thresh *= 2; 1579 if (bw->thresh > bw->buflen * 8) 1580 bw->thresh = bw->buflen * 8; 1581 } 1582 1583 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 1584 while (nanosleep(&ts, &rm) == -1) { 1585 if (errno != EINTR) 1586 break; 1587 ts = rm; 1588 } 1589 } 1590 1591 bw->lamt = 0; 1592 monotime_tv(&bw->bwstart); 1593 } 1594 1595 /* Make a template filename for mk[sd]temp() */ 1596 void 1597 mktemp_proto(char *s, size_t len) 1598 { 1599 const char *tmpdir; 1600 int r; 1601 1602 if ((tmpdir = getenv("TMPDIR")) != NULL) { 1603 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 1604 if (r > 0 && (size_t)r < len) 1605 return; 1606 } 1607 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 1608 if (r < 0 || (size_t)r >= len) 1609 fatal("%s: template string too short", __func__); 1610 } 1611 1612 static const struct { 1613 const char *name; 1614 int value; 1615 } ipqos[] = { 1616 { "none", INT_MAX }, /* can't use 0 here; that's CS0 */ 1617 { "af11", IPTOS_DSCP_AF11 }, 1618 { "af12", IPTOS_DSCP_AF12 }, 1619 { "af13", IPTOS_DSCP_AF13 }, 1620 { "af21", IPTOS_DSCP_AF21 }, 1621 { "af22", IPTOS_DSCP_AF22 }, 1622 { "af23", IPTOS_DSCP_AF23 }, 1623 { "af31", IPTOS_DSCP_AF31 }, 1624 { "af32", IPTOS_DSCP_AF32 }, 1625 { "af33", IPTOS_DSCP_AF33 }, 1626 { "af41", IPTOS_DSCP_AF41 }, 1627 { "af42", IPTOS_DSCP_AF42 }, 1628 { "af43", IPTOS_DSCP_AF43 }, 1629 { "cs0", IPTOS_DSCP_CS0 }, 1630 { "cs1", IPTOS_DSCP_CS1 }, 1631 { "cs2", IPTOS_DSCP_CS2 }, 1632 { "cs3", IPTOS_DSCP_CS3 }, 1633 { "cs4", IPTOS_DSCP_CS4 }, 1634 { "cs5", IPTOS_DSCP_CS5 }, 1635 { "cs6", IPTOS_DSCP_CS6 }, 1636 { "cs7", IPTOS_DSCP_CS7 }, 1637 { "ef", IPTOS_DSCP_EF }, 1638 { "le", IPTOS_DSCP_LE }, 1639 { "lowdelay", IPTOS_LOWDELAY }, 1640 { "throughput", IPTOS_THROUGHPUT }, 1641 { "reliability", IPTOS_RELIABILITY }, 1642 { NULL, -1 } 1643 }; 1644 1645 int 1646 parse_ipqos(const char *cp) 1647 { 1648 u_int i; 1649 char *ep; 1650 long val; 1651 1652 if (cp == NULL) 1653 return -1; 1654 for (i = 0; ipqos[i].name != NULL; i++) { 1655 if (strcasecmp(cp, ipqos[i].name) == 0) 1656 return ipqos[i].value; 1657 } 1658 /* Try parsing as an integer */ 1659 val = strtol(cp, &ep, 0); 1660 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1661 return -1; 1662 return val; 1663 } 1664 1665 const char * 1666 iptos2str(int iptos) 1667 { 1668 int i; 1669 static char iptos_str[sizeof "0xff"]; 1670 1671 for (i = 0; ipqos[i].name != NULL; i++) { 1672 if (ipqos[i].value == iptos) 1673 return ipqos[i].name; 1674 } 1675 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1676 return iptos_str; 1677 } 1678 1679 void 1680 lowercase(char *s) 1681 { 1682 for (; *s; s++) 1683 *s = tolower((u_char)*s); 1684 } 1685 1686 int 1687 unix_listener(const char *path, int backlog, int unlink_first) 1688 { 1689 struct sockaddr_un sunaddr; 1690 int saved_errno, sock; 1691 1692 memset(&sunaddr, 0, sizeof(sunaddr)); 1693 sunaddr.sun_family = AF_UNIX; 1694 if (strlcpy(sunaddr.sun_path, path, 1695 sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { 1696 error("%s: path \"%s\" too long for Unix domain socket", 1697 __func__, path); 1698 errno = ENAMETOOLONG; 1699 return -1; 1700 } 1701 1702 sock = socket(PF_UNIX, SOCK_STREAM, 0); 1703 if (sock == -1) { 1704 saved_errno = errno; 1705 error("%s: socket: %.100s", __func__, strerror(errno)); 1706 errno = saved_errno; 1707 return -1; 1708 } 1709 if (unlink_first == 1) { 1710 if (unlink(path) != 0 && errno != ENOENT) 1711 error("unlink(%s): %.100s", path, strerror(errno)); 1712 } 1713 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { 1714 saved_errno = errno; 1715 error("%s: cannot bind to path %s: %s", 1716 __func__, path, strerror(errno)); 1717 close(sock); 1718 errno = saved_errno; 1719 return -1; 1720 } 1721 if (listen(sock, backlog) == -1) { 1722 saved_errno = errno; 1723 error("%s: cannot listen on path %s: %s", 1724 __func__, path, strerror(errno)); 1725 close(sock); 1726 unlink(path); 1727 errno = saved_errno; 1728 return -1; 1729 } 1730 return sock; 1731 } 1732 1733 /* 1734 * Compares two strings that maybe be NULL. Returns non-zero if strings 1735 * are both NULL or are identical, returns zero otherwise. 1736 */ 1737 static int 1738 strcmp_maybe_null(const char *a, const char *b) 1739 { 1740 if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) 1741 return 0; 1742 if (a != NULL && strcmp(a, b) != 0) 1743 return 0; 1744 return 1; 1745 } 1746 1747 /* 1748 * Compare two forwards, returning non-zero if they are identical or 1749 * zero otherwise. 1750 */ 1751 int 1752 forward_equals(const struct Forward *a, const struct Forward *b) 1753 { 1754 if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) 1755 return 0; 1756 if (a->listen_port != b->listen_port) 1757 return 0; 1758 if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) 1759 return 0; 1760 if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) 1761 return 0; 1762 if (a->connect_port != b->connect_port) 1763 return 0; 1764 if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) 1765 return 0; 1766 /* allocated_port and handle are not checked */ 1767 return 1; 1768 } 1769 1770 /* returns 1 if process is already daemonized, 0 otherwise */ 1771 int 1772 daemonized(void) 1773 { 1774 int fd; 1775 1776 if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) { 1777 close(fd); 1778 return 0; /* have controlling terminal */ 1779 } 1780 if (getppid() != 1) 1781 return 0; /* parent is not init */ 1782 if (getsid(0) != getpid()) 1783 return 0; /* not session leader */ 1784 debug3("already daemonized"); 1785 return 1; 1786 } 1787 1788 1789 /* 1790 * Splits 's' into an argument vector. Handles quoted string and basic 1791 * escape characters (\\, \", \'). Caller must free the argument vector 1792 * and its members. 1793 */ 1794 int 1795 argv_split(const char *s, int *argcp, char ***argvp) 1796 { 1797 int r = SSH_ERR_INTERNAL_ERROR; 1798 int argc = 0, quote, i, j; 1799 char *arg, **argv = xcalloc(1, sizeof(*argv)); 1800 1801 *argvp = NULL; 1802 *argcp = 0; 1803 1804 for (i = 0; s[i] != '\0'; i++) { 1805 /* Skip leading whitespace */ 1806 if (s[i] == ' ' || s[i] == '\t') 1807 continue; 1808 1809 /* Start of a token */ 1810 quote = 0; 1811 if (s[i] == '\\' && 1812 (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\')) 1813 i++; 1814 else if (s[i] == '\'' || s[i] == '"') 1815 quote = s[i++]; 1816 1817 argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); 1818 arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); 1819 argv[argc] = NULL; 1820 1821 /* Copy the token in, removing escapes */ 1822 for (j = 0; s[i] != '\0'; i++) { 1823 if (s[i] == '\\') { 1824 if (s[i + 1] == '\'' || 1825 s[i + 1] == '\"' || 1826 s[i + 1] == '\\') { 1827 i++; /* Skip '\' */ 1828 arg[j++] = s[i]; 1829 } else { 1830 /* Unrecognised escape */ 1831 arg[j++] = s[i]; 1832 } 1833 } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) 1834 break; /* done */ 1835 else if (quote != 0 && s[i] == quote) 1836 break; /* done */ 1837 else 1838 arg[j++] = s[i]; 1839 } 1840 if (s[i] == '\0') { 1841 if (quote != 0) { 1842 /* Ran out of string looking for close quote */ 1843 r = SSH_ERR_INVALID_FORMAT; 1844 goto out; 1845 } 1846 break; 1847 } 1848 } 1849 /* Success */ 1850 *argcp = argc; 1851 *argvp = argv; 1852 argc = 0; 1853 argv = NULL; 1854 r = 0; 1855 out: 1856 if (argc != 0 && argv != NULL) { 1857 for (i = 0; i < argc; i++) 1858 free(argv[i]); 1859 free(argv); 1860 } 1861 return r; 1862 } 1863 1864 /* 1865 * Reassemble an argument vector into a string, quoting and escaping as 1866 * necessary. Caller must free returned string. 1867 */ 1868 char * 1869 argv_assemble(int argc, char **argv) 1870 { 1871 int i, j, ws, r; 1872 char c, *ret; 1873 struct sshbuf *buf, *arg; 1874 1875 if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL) 1876 fatal("%s: sshbuf_new failed", __func__); 1877 1878 for (i = 0; i < argc; i++) { 1879 ws = 0; 1880 sshbuf_reset(arg); 1881 for (j = 0; argv[i][j] != '\0'; j++) { 1882 r = 0; 1883 c = argv[i][j]; 1884 switch (c) { 1885 case ' ': 1886 case '\t': 1887 ws = 1; 1888 r = sshbuf_put_u8(arg, c); 1889 break; 1890 case '\\': 1891 case '\'': 1892 case '"': 1893 if ((r = sshbuf_put_u8(arg, '\\')) != 0) 1894 break; 1895 /* FALLTHROUGH */ 1896 default: 1897 r = sshbuf_put_u8(arg, c); 1898 break; 1899 } 1900 if (r != 0) 1901 fatal("%s: sshbuf_put_u8: %s", 1902 __func__, ssh_err(r)); 1903 } 1904 if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || 1905 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || 1906 (r = sshbuf_putb(buf, arg)) != 0 || 1907 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) 1908 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1909 } 1910 if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL) 1911 fatal("%s: malloc failed", __func__); 1912 memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); 1913 ret[sshbuf_len(buf)] = '\0'; 1914 sshbuf_free(buf); 1915 sshbuf_free(arg); 1916 return ret; 1917 } 1918 1919 /* Returns 0 if pid exited cleanly, non-zero otherwise */ 1920 int 1921 exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) 1922 { 1923 int status; 1924 1925 while (waitpid(pid, &status, 0) == -1) { 1926 if (errno != EINTR) { 1927 error("%s: waitpid: %s", tag, strerror(errno)); 1928 return -1; 1929 } 1930 } 1931 if (WIFSIGNALED(status)) { 1932 error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status)); 1933 return -1; 1934 } else if (WEXITSTATUS(status) != 0) { 1935 do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, 1936 "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status)); 1937 return -1; 1938 } 1939 return 0; 1940 } 1941 1942 /* 1943 * Check a given path for security. This is defined as all components 1944 * of the path to the file must be owned by either the owner of 1945 * of the file or root and no directories must be group or world writable. 1946 * 1947 * XXX Should any specific check be done for sym links ? 1948 * 1949 * Takes a file name, its stat information (preferably from fstat() to 1950 * avoid races), the uid of the expected owner, their home directory and an 1951 * error buffer plus max size as arguments. 1952 * 1953 * Returns 0 on success and -1 on failure 1954 */ 1955 int 1956 safe_path(const char *name, struct stat *stp, const char *pw_dir, 1957 uid_t uid, char *err, size_t errlen) 1958 { 1959 char buf[PATH_MAX], homedir[PATH_MAX]; 1960 char *cp; 1961 int comparehome = 0; 1962 struct stat st; 1963 1964 if (realpath(name, buf) == NULL) { 1965 snprintf(err, errlen, "realpath %s failed: %s", name, 1966 strerror(errno)); 1967 return -1; 1968 } 1969 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 1970 comparehome = 1; 1971 1972 if (!S_ISREG(stp->st_mode)) { 1973 snprintf(err, errlen, "%s is not a regular file", buf); 1974 return -1; 1975 } 1976 if ((stp->st_uid != 0 && stp->st_uid != uid) || 1977 (stp->st_mode & 022) != 0) { 1978 snprintf(err, errlen, "bad ownership or modes for file %s", 1979 buf); 1980 return -1; 1981 } 1982 1983 /* for each component of the canonical path, walking upwards */ 1984 for (;;) { 1985 if ((cp = dirname(buf)) == NULL) { 1986 snprintf(err, errlen, "dirname() failed"); 1987 return -1; 1988 } 1989 strlcpy(buf, cp, sizeof(buf)); 1990 1991 if (stat(buf, &st) == -1 || 1992 (st.st_uid != 0 && st.st_uid != uid) || 1993 (st.st_mode & 022) != 0) { 1994 snprintf(err, errlen, 1995 "bad ownership or modes for directory %s", buf); 1996 return -1; 1997 } 1998 1999 /* If are past the homedir then we can stop */ 2000 if (comparehome && strcmp(homedir, buf) == 0) 2001 break; 2002 2003 /* 2004 * dirname should always complete with a "/" path, 2005 * but we can be paranoid and check for "." too 2006 */ 2007 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 2008 break; 2009 } 2010 return 0; 2011 } 2012 2013 /* 2014 * Version of safe_path() that accepts an open file descriptor to 2015 * avoid races. 2016 * 2017 * Returns 0 on success and -1 on failure 2018 */ 2019 int 2020 safe_path_fd(int fd, const char *file, struct passwd *pw, 2021 char *err, size_t errlen) 2022 { 2023 struct stat st; 2024 2025 /* check the open file to avoid races */ 2026 if (fstat(fd, &st) == -1) { 2027 snprintf(err, errlen, "cannot stat file %s: %s", 2028 file, strerror(errno)); 2029 return -1; 2030 } 2031 return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 2032 } 2033 2034 /* 2035 * Sets the value of the given variable in the environment. If the variable 2036 * already exists, its value is overridden. 2037 */ 2038 void 2039 child_set_env(char ***envp, u_int *envsizep, const char *name, 2040 const char *value) 2041 { 2042 char **env; 2043 u_int envsize; 2044 u_int i, namelen; 2045 2046 if (strchr(name, '=') != NULL) { 2047 error("Invalid environment variable \"%.100s\"", name); 2048 return; 2049 } 2050 2051 /* 2052 * Find the slot where the value should be stored. If the variable 2053 * already exists, we reuse the slot; otherwise we append a new slot 2054 * at the end of the array, expanding if necessary. 2055 */ 2056 env = *envp; 2057 namelen = strlen(name); 2058 for (i = 0; env[i]; i++) 2059 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') 2060 break; 2061 if (env[i]) { 2062 /* Reuse the slot. */ 2063 free(env[i]); 2064 } else { 2065 /* New variable. Expand if necessary. */ 2066 envsize = *envsizep; 2067 if (i >= envsize - 1) { 2068 if (envsize >= 1000) 2069 fatal("child_set_env: too many env vars"); 2070 envsize += 50; 2071 env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); 2072 *envsizep = envsize; 2073 } 2074 /* Need to set the NULL pointer at end of array beyond the new slot. */ 2075 env[i + 1] = NULL; 2076 } 2077 2078 /* Allocate space and format the variable in the appropriate slot. */ 2079 /* XXX xasprintf */ 2080 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); 2081 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); 2082 } 2083 2084 /* 2085 * Check and optionally lowercase a domain name, also removes trailing '.' 2086 * Returns 1 on success and 0 on failure, storing an error message in errstr. 2087 */ 2088 int 2089 valid_domain(char *name, int makelower, const char **errstr) 2090 { 2091 size_t i, l = strlen(name); 2092 u_char c, last = '\0'; 2093 static char errbuf[256]; 2094 2095 if (l == 0) { 2096 strlcpy(errbuf, "empty domain name", sizeof(errbuf)); 2097 goto bad; 2098 } 2099 if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { 2100 snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " 2101 "starts with invalid character", name); 2102 goto bad; 2103 } 2104 for (i = 0; i < l; i++) { 2105 c = tolower((u_char)name[i]); 2106 if (makelower) 2107 name[i] = (char)c; 2108 if (last == '.' && c == '.') { 2109 snprintf(errbuf, sizeof(errbuf), "domain name " 2110 "\"%.100s\" contains consecutive separators", name); 2111 goto bad; 2112 } 2113 if (c != '.' && c != '-' && !isalnum(c) && 2114 c != '_') /* technically invalid, but common */ { 2115 snprintf(errbuf, sizeof(errbuf), "domain name " 2116 "\"%.100s\" contains invalid characters", name); 2117 goto bad; 2118 } 2119 last = c; 2120 } 2121 if (name[l - 1] == '.') 2122 name[l - 1] = '\0'; 2123 if (errstr != NULL) 2124 *errstr = NULL; 2125 return 1; 2126 bad: 2127 if (errstr != NULL) 2128 *errstr = errbuf; 2129 return 0; 2130 } 2131 2132 /* 2133 * Verify that a environment variable name (not including initial '$') is 2134 * valid; consisting of one or more alphanumeric or underscore characters only. 2135 * Returns 1 on valid, 0 otherwise. 2136 */ 2137 int 2138 valid_env_name(const char *name) 2139 { 2140 const char *cp; 2141 2142 if (name[0] == '\0') 2143 return 0; 2144 for (cp = name; *cp != '\0'; cp++) { 2145 if (!isalnum((u_char)*cp) && *cp != '_') 2146 return 0; 2147 } 2148 return 1; 2149 } 2150 2151 const char * 2152 atoi_err(const char *nptr, int *val) 2153 { 2154 const char *errstr = NULL; 2155 long long num; 2156 2157 if (nptr == NULL || *nptr == '\0') 2158 return "missing"; 2159 num = strtonum(nptr, 0, INT_MAX, &errstr); 2160 if (errstr == NULL) 2161 *val = (int)num; 2162 return errstr; 2163 } 2164 2165 int 2166 parse_absolute_time(const char *s, uint64_t *tp) 2167 { 2168 struct tm tm; 2169 time_t tt; 2170 char buf[32], *fmt; 2171 2172 *tp = 0; 2173 2174 /* 2175 * POSIX strptime says "The application shall ensure that there 2176 * is white-space or other non-alphanumeric characters between 2177 * any two conversion specifications" so arrange things this way. 2178 */ 2179 switch (strlen(s)) { 2180 case 8: /* YYYYMMDD */ 2181 fmt = "%Y-%m-%d"; 2182 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 2183 break; 2184 case 12: /* YYYYMMDDHHMM */ 2185 fmt = "%Y-%m-%dT%H:%M"; 2186 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s", 2187 s, s + 4, s + 6, s + 8, s + 10); 2188 break; 2189 case 14: /* YYYYMMDDHHMMSS */ 2190 fmt = "%Y-%m-%dT%H:%M:%S"; 2191 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 2192 s, s + 4, s + 6, s + 8, s + 10, s + 12); 2193 break; 2194 default: 2195 return SSH_ERR_INVALID_FORMAT; 2196 } 2197 2198 memset(&tm, 0, sizeof(tm)); 2199 if (strptime(buf, fmt, &tm) == NULL) 2200 return SSH_ERR_INVALID_FORMAT; 2201 if ((tt = mktime(&tm)) < 0) 2202 return SSH_ERR_INVALID_FORMAT; 2203 /* success */ 2204 *tp = (uint64_t)tt; 2205 return 0; 2206 } 2207 2208 void 2209 format_absolute_time(uint64_t t, char *buf, size_t len) 2210 { 2211 time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */ 2212 struct tm tm; 2213 2214 localtime_r(&tt, &tm); 2215 strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm); 2216 } 2217 2218 /* check if path is absolute */ 2219 int 2220 path_absolute(const char *path) 2221 { 2222 return (*path == '/') ? 1 : 0; 2223 } 2224 2225 void 2226 skip_space(char **cpp) 2227 { 2228 char *cp; 2229 2230 for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++) 2231 ; 2232 *cpp = cp; 2233 } 2234 2235 /* authorized_key-style options parsing helpers */ 2236 2237 /* 2238 * Match flag 'opt' in *optsp, and if allow_negate is set then also match 2239 * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0 2240 * if negated option matches. 2241 * If the option or negated option matches, then *optsp is updated to 2242 * point to the first character after the option. 2243 */ 2244 int 2245 opt_flag(const char *opt, int allow_negate, const char **optsp) 2246 { 2247 size_t opt_len = strlen(opt); 2248 const char *opts = *optsp; 2249 int negate = 0; 2250 2251 if (allow_negate && strncasecmp(opts, "no-", 3) == 0) { 2252 opts += 3; 2253 negate = 1; 2254 } 2255 if (strncasecmp(opts, opt, opt_len) == 0) { 2256 *optsp = opts + opt_len; 2257 return negate ? 0 : 1; 2258 } 2259 return -1; 2260 } 2261 2262 char * 2263 opt_dequote(const char **sp, const char **errstrp) 2264 { 2265 const char *s = *sp; 2266 char *ret; 2267 size_t i; 2268 2269 *errstrp = NULL; 2270 if (*s != '"') { 2271 *errstrp = "missing start quote"; 2272 return NULL; 2273 } 2274 s++; 2275 if ((ret = malloc(strlen((s)) + 1)) == NULL) { 2276 *errstrp = "memory allocation failed"; 2277 return NULL; 2278 } 2279 for (i = 0; *s != '\0' && *s != '"';) { 2280 if (s[0] == '\\' && s[1] == '"') 2281 s++; 2282 ret[i++] = *s++; 2283 } 2284 if (*s == '\0') { 2285 *errstrp = "missing end quote"; 2286 free(ret); 2287 return NULL; 2288 } 2289 ret[i] = '\0'; 2290 s++; 2291 *sp = s; 2292 return ret; 2293 } 2294 2295 int 2296 opt_match(const char **opts, const char *term) 2297 { 2298 if (strncasecmp((*opts), term, strlen(term)) == 0 && 2299 (*opts)[strlen(term)] == '=') { 2300 *opts += strlen(term) + 1; 2301 return 1; 2302 } 2303 return 0; 2304 } 2305 2306 sshsig_t 2307 ssh_signal(int signum, sshsig_t handler) 2308 { 2309 struct sigaction sa, osa; 2310 2311 /* mask all other signals while in handler */ 2312 memset(&sa, 0, sizeof(sa)); 2313 sa.sa_handler = handler; 2314 sigfillset(&sa.sa_mask); 2315 if (signum != SIGALRM) 2316 sa.sa_flags = SA_RESTART; 2317 if (sigaction(signum, &sa, &osa) == -1) { 2318 debug3("sigaction(%s): %s", strsignal(signum), strerror(errno)); 2319 return SIG_ERR; 2320 } 2321 return osa.sa_handler; 2322 } 2323