1 /* $OpenBSD: misc.c,v 1.147 2020/04/25 06:59:36 dtucker Exp $ */ 2 /* 3 * Copyright (c) 2000 Markus Friedl. All rights reserved. 4 * Copyright (c) 2005,2006 Damien Miller. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 29 #include <sys/types.h> 30 #include <sys/ioctl.h> 31 #include <sys/socket.h> 32 #include <sys/stat.h> 33 #include <sys/time.h> 34 #include <sys/wait.h> 35 #include <sys/un.h> 36 37 #include <limits.h> 38 #ifdef HAVE_LIBGEN_H 39 # include <libgen.h> 40 #endif 41 #ifdef HAVE_POLL_H 42 #include <poll.h> 43 #endif 44 #include <signal.h> 45 #include <stdarg.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <time.h> 50 #include <unistd.h> 51 52 #include <netinet/in.h> 53 #include <netinet/in_systm.h> 54 #include <netinet/ip.h> 55 #include <netinet/tcp.h> 56 #include <arpa/inet.h> 57 58 #include <ctype.h> 59 #include <errno.h> 60 #include <fcntl.h> 61 #include <netdb.h> 62 #ifdef HAVE_PATHS_H 63 # include <paths.h> 64 #include <pwd.h> 65 #endif 66 #ifdef SSH_TUN_OPENBSD 67 #include <net/if.h> 68 #endif 69 70 #include "xmalloc.h" 71 #include "misc.h" 72 #include "log.h" 73 #include "ssh.h" 74 #include "sshbuf.h" 75 #include "ssherr.h" 76 #include "platform.h" 77 78 /* remove newline at end of string */ 79 char * 80 chop(char *s) 81 { 82 char *t = s; 83 while (*t) { 84 if (*t == '\n' || *t == '\r') { 85 *t = '\0'; 86 return s; 87 } 88 t++; 89 } 90 return s; 91 92 } 93 94 /* set/unset filedescriptor to non-blocking */ 95 int 96 set_nonblock(int fd) 97 { 98 int val; 99 100 val = fcntl(fd, F_GETFL); 101 if (val == -1) { 102 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 103 return (-1); 104 } 105 if (val & O_NONBLOCK) { 106 debug3("fd %d is O_NONBLOCK", fd); 107 return (0); 108 } 109 debug2("fd %d setting O_NONBLOCK", fd); 110 val |= O_NONBLOCK; 111 if (fcntl(fd, F_SETFL, val) == -1) { 112 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 113 strerror(errno)); 114 return (-1); 115 } 116 return (0); 117 } 118 119 int 120 unset_nonblock(int fd) 121 { 122 int val; 123 124 val = fcntl(fd, F_GETFL); 125 if (val == -1) { 126 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 127 return (-1); 128 } 129 if (!(val & O_NONBLOCK)) { 130 debug3("fd %d is not O_NONBLOCK", fd); 131 return (0); 132 } 133 debug("fd %d clearing O_NONBLOCK", fd); 134 val &= ~O_NONBLOCK; 135 if (fcntl(fd, F_SETFL, val) == -1) { 136 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 137 fd, strerror(errno)); 138 return (-1); 139 } 140 return (0); 141 } 142 143 const char * 144 ssh_gai_strerror(int gaierr) 145 { 146 if (gaierr == EAI_SYSTEM && errno != 0) 147 return strerror(errno); 148 return gai_strerror(gaierr); 149 } 150 151 /* disable nagle on socket */ 152 void 153 set_nodelay(int fd) 154 { 155 int opt; 156 socklen_t optlen; 157 158 optlen = sizeof opt; 159 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 160 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 161 return; 162 } 163 if (opt == 1) { 164 debug2("fd %d is TCP_NODELAY", fd); 165 return; 166 } 167 opt = 1; 168 debug2("fd %d setting TCP_NODELAY", fd); 169 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 170 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 171 } 172 173 /* Allow local port reuse in TIME_WAIT */ 174 int 175 set_reuseaddr(int fd) 176 { 177 int on = 1; 178 179 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) { 180 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno)); 181 return -1; 182 } 183 return 0; 184 } 185 186 /* Get/set routing domain */ 187 char * 188 get_rdomain(int fd) 189 { 190 #if defined(HAVE_SYS_GET_RDOMAIN) 191 return sys_get_rdomain(fd); 192 #elif defined(__OpenBSD__) 193 int rtable; 194 char *ret; 195 socklen_t len = sizeof(rtable); 196 197 if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) { 198 error("Failed to get routing domain for fd %d: %s", 199 fd, strerror(errno)); 200 return NULL; 201 } 202 xasprintf(&ret, "%d", rtable); 203 return ret; 204 #else /* defined(__OpenBSD__) */ 205 return NULL; 206 #endif 207 } 208 209 int 210 set_rdomain(int fd, const char *name) 211 { 212 #if defined(HAVE_SYS_SET_RDOMAIN) 213 return sys_set_rdomain(fd, name); 214 #elif defined(__OpenBSD__) 215 int rtable; 216 const char *errstr; 217 218 if (name == NULL) 219 return 0; /* default table */ 220 221 rtable = (int)strtonum(name, 0, 255, &errstr); 222 if (errstr != NULL) { 223 /* Shouldn't happen */ 224 error("Invalid routing domain \"%s\": %s", name, errstr); 225 return -1; 226 } 227 if (setsockopt(fd, SOL_SOCKET, SO_RTABLE, 228 &rtable, sizeof(rtable)) == -1) { 229 error("Failed to set routing domain %d on fd %d: %s", 230 rtable, fd, strerror(errno)); 231 return -1; 232 } 233 return 0; 234 #else /* defined(__OpenBSD__) */ 235 error("Setting routing domain is not supported on this platform"); 236 return -1; 237 #endif 238 } 239 240 /* 241 * Wait up to *timeoutp milliseconds for events on fd. Updates 242 * *timeoutp with time remaining. 243 * Returns 0 if fd ready or -1 on timeout or error (see errno). 244 */ 245 static int 246 waitfd(int fd, int *timeoutp, short events) 247 { 248 struct pollfd pfd; 249 struct timeval t_start; 250 int oerrno, r; 251 252 monotime_tv(&t_start); 253 pfd.fd = fd; 254 pfd.events = events; 255 for (; *timeoutp >= 0;) { 256 r = poll(&pfd, 1, *timeoutp); 257 oerrno = errno; 258 ms_subtract_diff(&t_start, timeoutp); 259 errno = oerrno; 260 if (r > 0) 261 return 0; 262 else if (r == -1 && errno != EAGAIN) 263 return -1; 264 else if (r == 0) 265 break; 266 } 267 /* timeout */ 268 errno = ETIMEDOUT; 269 return -1; 270 } 271 272 /* 273 * Wait up to *timeoutp milliseconds for fd to be readable. Updates 274 * *timeoutp with time remaining. 275 * Returns 0 if fd ready or -1 on timeout or error (see errno). 276 */ 277 int 278 waitrfd(int fd, int *timeoutp) { 279 return waitfd(fd, timeoutp, POLLIN); 280 } 281 282 /* 283 * Attempt a non-blocking connect(2) to the specified address, waiting up to 284 * *timeoutp milliseconds for the connection to complete. If the timeout is 285 * <=0, then wait indefinitely. 286 * 287 * Returns 0 on success or -1 on failure. 288 */ 289 int 290 timeout_connect(int sockfd, const struct sockaddr *serv_addr, 291 socklen_t addrlen, int *timeoutp) 292 { 293 int optval = 0; 294 socklen_t optlen = sizeof(optval); 295 296 /* No timeout: just do a blocking connect() */ 297 if (timeoutp == NULL || *timeoutp <= 0) 298 return connect(sockfd, serv_addr, addrlen); 299 300 set_nonblock(sockfd); 301 if (connect(sockfd, serv_addr, addrlen) == 0) { 302 /* Succeeded already? */ 303 unset_nonblock(sockfd); 304 return 0; 305 } else if (errno != EINPROGRESS) 306 return -1; 307 308 if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1) 309 return -1; 310 311 /* Completed or failed */ 312 if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) { 313 debug("getsockopt: %s", strerror(errno)); 314 return -1; 315 } 316 if (optval != 0) { 317 errno = optval; 318 return -1; 319 } 320 unset_nonblock(sockfd); 321 return 0; 322 } 323 324 /* Characters considered whitespace in strsep calls. */ 325 #define WHITESPACE " \t\r\n" 326 #define QUOTE "\"" 327 328 /* return next token in configuration line */ 329 static char * 330 strdelim_internal(char **s, int split_equals) 331 { 332 char *old; 333 int wspace = 0; 334 335 if (*s == NULL) 336 return NULL; 337 338 old = *s; 339 340 *s = strpbrk(*s, 341 split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE); 342 if (*s == NULL) 343 return (old); 344 345 if (*s[0] == '\"') { 346 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 347 /* Find matching quote */ 348 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 349 return (NULL); /* no matching quote */ 350 } else { 351 *s[0] = '\0'; 352 *s += strspn(*s + 1, WHITESPACE) + 1; 353 return (old); 354 } 355 } 356 357 /* Allow only one '=' to be skipped */ 358 if (split_equals && *s[0] == '=') 359 wspace = 1; 360 *s[0] = '\0'; 361 362 /* Skip any extra whitespace after first token */ 363 *s += strspn(*s + 1, WHITESPACE) + 1; 364 if (split_equals && *s[0] == '=' && !wspace) 365 *s += strspn(*s + 1, WHITESPACE) + 1; 366 367 return (old); 368 } 369 370 /* 371 * Return next token in configuration line; splts on whitespace or a 372 * single '=' character. 373 */ 374 char * 375 strdelim(char **s) 376 { 377 return strdelim_internal(s, 1); 378 } 379 380 /* 381 * Return next token in configuration line; splts on whitespace only. 382 */ 383 char * 384 strdelimw(char **s) 385 { 386 return strdelim_internal(s, 0); 387 } 388 389 struct passwd * 390 pwcopy(struct passwd *pw) 391 { 392 struct passwd *copy = xcalloc(1, sizeof(*copy)); 393 394 copy->pw_name = xstrdup(pw->pw_name); 395 copy->pw_passwd = xstrdup(pw->pw_passwd); 396 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 397 copy->pw_gecos = xstrdup(pw->pw_gecos); 398 #endif 399 copy->pw_uid = pw->pw_uid; 400 copy->pw_gid = pw->pw_gid; 401 #ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE 402 copy->pw_expire = pw->pw_expire; 403 #endif 404 #ifdef HAVE_STRUCT_PASSWD_PW_CHANGE 405 copy->pw_change = pw->pw_change; 406 #endif 407 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 408 copy->pw_class = xstrdup(pw->pw_class); 409 #endif 410 copy->pw_dir = xstrdup(pw->pw_dir); 411 copy->pw_shell = xstrdup(pw->pw_shell); 412 return copy; 413 } 414 415 /* 416 * Convert ASCII string to TCP/IP port number. 417 * Port must be >=0 and <=65535. 418 * Return -1 if invalid. 419 */ 420 int 421 a2port(const char *s) 422 { 423 struct servent *se; 424 long long port; 425 const char *errstr; 426 427 port = strtonum(s, 0, 65535, &errstr); 428 if (errstr == NULL) 429 return (int)port; 430 if ((se = getservbyname(s, "tcp")) != NULL) 431 return ntohs(se->s_port); 432 return -1; 433 } 434 435 int 436 a2tun(const char *s, int *remote) 437 { 438 const char *errstr = NULL; 439 char *sp, *ep; 440 int tun; 441 442 if (remote != NULL) { 443 *remote = SSH_TUNID_ANY; 444 sp = xstrdup(s); 445 if ((ep = strchr(sp, ':')) == NULL) { 446 free(sp); 447 return (a2tun(s, NULL)); 448 } 449 ep[0] = '\0'; ep++; 450 *remote = a2tun(ep, NULL); 451 tun = a2tun(sp, NULL); 452 free(sp); 453 return (*remote == SSH_TUNID_ERR ? *remote : tun); 454 } 455 456 if (strcasecmp(s, "any") == 0) 457 return (SSH_TUNID_ANY); 458 459 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 460 if (errstr != NULL) 461 return (SSH_TUNID_ERR); 462 463 return (tun); 464 } 465 466 #define SECONDS 1 467 #define MINUTES (SECONDS * 60) 468 #define HOURS (MINUTES * 60) 469 #define DAYS (HOURS * 24) 470 #define WEEKS (DAYS * 7) 471 472 /* 473 * Convert a time string into seconds; format is 474 * a sequence of: 475 * time[qualifier] 476 * 477 * Valid time qualifiers are: 478 * <none> seconds 479 * s|S seconds 480 * m|M minutes 481 * h|H hours 482 * d|D days 483 * w|W weeks 484 * 485 * Examples: 486 * 90m 90 minutes 487 * 1h30m 90 minutes 488 * 2d 2 days 489 * 1w 1 week 490 * 491 * Return -1 if time string is invalid. 492 */ 493 long 494 convtime(const char *s) 495 { 496 long total, secs, multiplier = 1; 497 const char *p; 498 char *endp; 499 500 errno = 0; 501 total = 0; 502 p = s; 503 504 if (p == NULL || *p == '\0') 505 return -1; 506 507 while (*p) { 508 secs = strtol(p, &endp, 10); 509 if (p == endp || 510 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || 511 secs < 0) 512 return -1; 513 514 switch (*endp++) { 515 case '\0': 516 endp--; 517 break; 518 case 's': 519 case 'S': 520 break; 521 case 'm': 522 case 'M': 523 multiplier = MINUTES; 524 break; 525 case 'h': 526 case 'H': 527 multiplier = HOURS; 528 break; 529 case 'd': 530 case 'D': 531 multiplier = DAYS; 532 break; 533 case 'w': 534 case 'W': 535 multiplier = WEEKS; 536 break; 537 default: 538 return -1; 539 } 540 if (secs >= LONG_MAX / multiplier) 541 return -1; 542 secs *= multiplier; 543 if (total >= LONG_MAX - secs) 544 return -1; 545 total += secs; 546 if (total < 0) 547 return -1; 548 p = endp; 549 } 550 551 return total; 552 } 553 554 /* 555 * Returns a standardized host+port identifier string. 556 * Caller must free returned string. 557 */ 558 char * 559 put_host_port(const char *host, u_short port) 560 { 561 char *hoststr; 562 563 if (port == 0 || port == SSH_DEFAULT_PORT) 564 return(xstrdup(host)); 565 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1) 566 fatal("put_host_port: asprintf: %s", strerror(errno)); 567 debug3("put_host_port: %s", hoststr); 568 return hoststr; 569 } 570 571 /* 572 * Search for next delimiter between hostnames/addresses and ports. 573 * Argument may be modified (for termination). 574 * Returns *cp if parsing succeeds. 575 * *cp is set to the start of the next field, if one was found. 576 * The delimiter char, if present, is stored in delim. 577 * If this is the last field, *cp is set to NULL. 578 */ 579 char * 580 hpdelim2(char **cp, char *delim) 581 { 582 char *s, *old; 583 584 if (cp == NULL || *cp == NULL) 585 return NULL; 586 587 old = s = *cp; 588 if (*s == '[') { 589 if ((s = strchr(s, ']')) == NULL) 590 return NULL; 591 else 592 s++; 593 } else if ((s = strpbrk(s, ":/")) == NULL) 594 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 595 596 switch (*s) { 597 case '\0': 598 *cp = NULL; /* no more fields*/ 599 break; 600 601 case ':': 602 case '/': 603 if (delim != NULL) 604 *delim = *s; 605 *s = '\0'; /* terminate */ 606 *cp = s + 1; 607 break; 608 609 default: 610 return NULL; 611 } 612 613 return old; 614 } 615 616 char * 617 hpdelim(char **cp) 618 { 619 return hpdelim2(cp, NULL); 620 } 621 622 char * 623 cleanhostname(char *host) 624 { 625 if (*host == '[' && host[strlen(host) - 1] == ']') { 626 host[strlen(host) - 1] = '\0'; 627 return (host + 1); 628 } else 629 return host; 630 } 631 632 char * 633 colon(char *cp) 634 { 635 int flag = 0; 636 637 if (*cp == ':') /* Leading colon is part of file name. */ 638 return NULL; 639 if (*cp == '[') 640 flag = 1; 641 642 for (; *cp; ++cp) { 643 if (*cp == '@' && *(cp+1) == '[') 644 flag = 1; 645 if (*cp == ']' && *(cp+1) == ':' && flag) 646 return (cp+1); 647 if (*cp == ':' && !flag) 648 return (cp); 649 if (*cp == '/') 650 return NULL; 651 } 652 return NULL; 653 } 654 655 /* 656 * Parse a [user@]host:[path] string. 657 * Caller must free returned user, host and path. 658 * Any of the pointer return arguments may be NULL (useful for syntax checking). 659 * If user was not specified then *userp will be set to NULL. 660 * If host was not specified then *hostp will be set to NULL. 661 * If path was not specified then *pathp will be set to ".". 662 * Returns 0 on success, -1 on failure. 663 */ 664 int 665 parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp) 666 { 667 char *user = NULL, *host = NULL, *path = NULL; 668 char *sdup, *tmp; 669 int ret = -1; 670 671 if (userp != NULL) 672 *userp = NULL; 673 if (hostp != NULL) 674 *hostp = NULL; 675 if (pathp != NULL) 676 *pathp = NULL; 677 678 sdup = xstrdup(s); 679 680 /* Check for remote syntax: [user@]host:[path] */ 681 if ((tmp = colon(sdup)) == NULL) 682 goto out; 683 684 /* Extract optional path */ 685 *tmp++ = '\0'; 686 if (*tmp == '\0') 687 tmp = "."; 688 path = xstrdup(tmp); 689 690 /* Extract optional user and mandatory host */ 691 tmp = strrchr(sdup, '@'); 692 if (tmp != NULL) { 693 *tmp++ = '\0'; 694 host = xstrdup(cleanhostname(tmp)); 695 if (*sdup != '\0') 696 user = xstrdup(sdup); 697 } else { 698 host = xstrdup(cleanhostname(sdup)); 699 user = NULL; 700 } 701 702 /* Success */ 703 if (userp != NULL) { 704 *userp = user; 705 user = NULL; 706 } 707 if (hostp != NULL) { 708 *hostp = host; 709 host = NULL; 710 } 711 if (pathp != NULL) { 712 *pathp = path; 713 path = NULL; 714 } 715 ret = 0; 716 out: 717 free(sdup); 718 free(user); 719 free(host); 720 free(path); 721 return ret; 722 } 723 724 /* 725 * Parse a [user@]host[:port] string. 726 * Caller must free returned user and host. 727 * Any of the pointer return arguments may be NULL (useful for syntax checking). 728 * If user was not specified then *userp will be set to NULL. 729 * If port was not specified then *portp will be -1. 730 * Returns 0 on success, -1 on failure. 731 */ 732 int 733 parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) 734 { 735 char *sdup, *cp, *tmp; 736 char *user = NULL, *host = NULL; 737 int port = -1, ret = -1; 738 739 if (userp != NULL) 740 *userp = NULL; 741 if (hostp != NULL) 742 *hostp = NULL; 743 if (portp != NULL) 744 *portp = -1; 745 746 if ((sdup = tmp = strdup(s)) == NULL) 747 return -1; 748 /* Extract optional username */ 749 if ((cp = strrchr(tmp, '@')) != NULL) { 750 *cp = '\0'; 751 if (*tmp == '\0') 752 goto out; 753 if ((user = strdup(tmp)) == NULL) 754 goto out; 755 tmp = cp + 1; 756 } 757 /* Extract mandatory hostname */ 758 if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') 759 goto out; 760 host = xstrdup(cleanhostname(cp)); 761 /* Convert and verify optional port */ 762 if (tmp != NULL && *tmp != '\0') { 763 if ((port = a2port(tmp)) <= 0) 764 goto out; 765 } 766 /* Success */ 767 if (userp != NULL) { 768 *userp = user; 769 user = NULL; 770 } 771 if (hostp != NULL) { 772 *hostp = host; 773 host = NULL; 774 } 775 if (portp != NULL) 776 *portp = port; 777 ret = 0; 778 out: 779 free(sdup); 780 free(user); 781 free(host); 782 return ret; 783 } 784 785 /* 786 * Converts a two-byte hex string to decimal. 787 * Returns the decimal value or -1 for invalid input. 788 */ 789 static int 790 hexchar(const char *s) 791 { 792 unsigned char result[2]; 793 int i; 794 795 for (i = 0; i < 2; i++) { 796 if (s[i] >= '0' && s[i] <= '9') 797 result[i] = (unsigned char)(s[i] - '0'); 798 else if (s[i] >= 'a' && s[i] <= 'f') 799 result[i] = (unsigned char)(s[i] - 'a') + 10; 800 else if (s[i] >= 'A' && s[i] <= 'F') 801 result[i] = (unsigned char)(s[i] - 'A') + 10; 802 else 803 return -1; 804 } 805 return (result[0] << 4) | result[1]; 806 } 807 808 /* 809 * Decode an url-encoded string. 810 * Returns a newly allocated string on success or NULL on failure. 811 */ 812 static char * 813 urldecode(const char *src) 814 { 815 char *ret, *dst; 816 int ch; 817 818 ret = xmalloc(strlen(src) + 1); 819 for (dst = ret; *src != '\0'; src++) { 820 switch (*src) { 821 case '+': 822 *dst++ = ' '; 823 break; 824 case '%': 825 if (!isxdigit((unsigned char)src[1]) || 826 !isxdigit((unsigned char)src[2]) || 827 (ch = hexchar(src + 1)) == -1) { 828 free(ret); 829 return NULL; 830 } 831 *dst++ = ch; 832 src += 2; 833 break; 834 default: 835 *dst++ = *src; 836 break; 837 } 838 } 839 *dst = '\0'; 840 841 return ret; 842 } 843 844 /* 845 * Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI. 846 * See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04 847 * Either user or path may be url-encoded (but not host or port). 848 * Caller must free returned user, host and path. 849 * Any of the pointer return arguments may be NULL (useful for syntax checking) 850 * but the scheme must always be specified. 851 * If user was not specified then *userp will be set to NULL. 852 * If port was not specified then *portp will be -1. 853 * If path was not specified then *pathp will be set to NULL. 854 * Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri. 855 */ 856 int 857 parse_uri(const char *scheme, const char *uri, char **userp, char **hostp, 858 int *portp, char **pathp) 859 { 860 char *uridup, *cp, *tmp, ch; 861 char *user = NULL, *host = NULL, *path = NULL; 862 int port = -1, ret = -1; 863 size_t len; 864 865 len = strlen(scheme); 866 if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0) 867 return 1; 868 uri += len + 3; 869 870 if (userp != NULL) 871 *userp = NULL; 872 if (hostp != NULL) 873 *hostp = NULL; 874 if (portp != NULL) 875 *portp = -1; 876 if (pathp != NULL) 877 *pathp = NULL; 878 879 uridup = tmp = xstrdup(uri); 880 881 /* Extract optional ssh-info (username + connection params) */ 882 if ((cp = strchr(tmp, '@')) != NULL) { 883 char *delim; 884 885 *cp = '\0'; 886 /* Extract username and connection params */ 887 if ((delim = strchr(tmp, ';')) != NULL) { 888 /* Just ignore connection params for now */ 889 *delim = '\0'; 890 } 891 if (*tmp == '\0') { 892 /* Empty username */ 893 goto out; 894 } 895 if ((user = urldecode(tmp)) == NULL) 896 goto out; 897 tmp = cp + 1; 898 } 899 900 /* Extract mandatory hostname */ 901 if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0') 902 goto out; 903 host = xstrdup(cleanhostname(cp)); 904 if (!valid_domain(host, 0, NULL)) 905 goto out; 906 907 if (tmp != NULL && *tmp != '\0') { 908 if (ch == ':') { 909 /* Convert and verify port. */ 910 if ((cp = strchr(tmp, '/')) != NULL) 911 *cp = '\0'; 912 if ((port = a2port(tmp)) <= 0) 913 goto out; 914 tmp = cp ? cp + 1 : NULL; 915 } 916 if (tmp != NULL && *tmp != '\0') { 917 /* Extract optional path */ 918 if ((path = urldecode(tmp)) == NULL) 919 goto out; 920 } 921 } 922 923 /* Success */ 924 if (userp != NULL) { 925 *userp = user; 926 user = NULL; 927 } 928 if (hostp != NULL) { 929 *hostp = host; 930 host = NULL; 931 } 932 if (portp != NULL) 933 *portp = port; 934 if (pathp != NULL) { 935 *pathp = path; 936 path = NULL; 937 } 938 ret = 0; 939 out: 940 free(uridup); 941 free(user); 942 free(host); 943 free(path); 944 return ret; 945 } 946 947 /* function to assist building execv() arguments */ 948 void 949 addargs(arglist *args, char *fmt, ...) 950 { 951 va_list ap; 952 char *cp; 953 u_int nalloc; 954 int r; 955 956 va_start(ap, fmt); 957 r = vasprintf(&cp, fmt, ap); 958 va_end(ap); 959 if (r == -1) 960 fatal("addargs: argument too long"); 961 962 nalloc = args->nalloc; 963 if (args->list == NULL) { 964 nalloc = 32; 965 args->num = 0; 966 } else if (args->num+2 >= nalloc) 967 nalloc *= 2; 968 969 args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *)); 970 args->nalloc = nalloc; 971 args->list[args->num++] = cp; 972 args->list[args->num] = NULL; 973 } 974 975 void 976 replacearg(arglist *args, u_int which, char *fmt, ...) 977 { 978 va_list ap; 979 char *cp; 980 int r; 981 982 va_start(ap, fmt); 983 r = vasprintf(&cp, fmt, ap); 984 va_end(ap); 985 if (r == -1) 986 fatal("replacearg: argument too long"); 987 988 if (which >= args->num) 989 fatal("replacearg: tried to replace invalid arg %d >= %d", 990 which, args->num); 991 free(args->list[which]); 992 args->list[which] = cp; 993 } 994 995 void 996 freeargs(arglist *args) 997 { 998 u_int i; 999 1000 if (args->list != NULL) { 1001 for (i = 0; i < args->num; i++) 1002 free(args->list[i]); 1003 free(args->list); 1004 args->nalloc = args->num = 0; 1005 args->list = NULL; 1006 } 1007 } 1008 1009 /* 1010 * Expands tildes in the file name. Returns data allocated by xmalloc. 1011 * Warning: this calls getpw*. 1012 */ 1013 char * 1014 tilde_expand_filename(const char *filename, uid_t uid) 1015 { 1016 const char *path, *sep; 1017 char user[128], *ret; 1018 struct passwd *pw; 1019 u_int len, slash; 1020 1021 if (*filename != '~') 1022 return (xstrdup(filename)); 1023 filename++; 1024 1025 path = strchr(filename, '/'); 1026 if (path != NULL && path > filename) { /* ~user/path */ 1027 slash = path - filename; 1028 if (slash > sizeof(user) - 1) 1029 fatal("tilde_expand_filename: ~username too long"); 1030 memcpy(user, filename, slash); 1031 user[slash] = '\0'; 1032 if ((pw = getpwnam(user)) == NULL) 1033 fatal("tilde_expand_filename: No such user %s", user); 1034 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 1035 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 1036 1037 /* Make sure directory has a trailing '/' */ 1038 len = strlen(pw->pw_dir); 1039 if (len == 0 || pw->pw_dir[len - 1] != '/') 1040 sep = "/"; 1041 else 1042 sep = ""; 1043 1044 /* Skip leading '/' from specified path */ 1045 if (path != NULL) 1046 filename = path + 1; 1047 1048 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) 1049 fatal("tilde_expand_filename: Path too long"); 1050 1051 return (ret); 1052 } 1053 1054 /* 1055 * Expand a string with a set of %[char] escapes. A number of escapes may be 1056 * specified as (char *escape_chars, char *replacement) pairs. The list must 1057 * be terminated by a NULL escape_char. Returns replaced string in memory 1058 * allocated by xmalloc. 1059 */ 1060 char * 1061 percent_expand(const char *string, ...) 1062 { 1063 #define EXPAND_MAX_KEYS 16 1064 u_int num_keys, i; 1065 struct { 1066 const char *key; 1067 const char *repl; 1068 } keys[EXPAND_MAX_KEYS]; 1069 struct sshbuf *buf; 1070 va_list ap; 1071 int r; 1072 char *ret; 1073 1074 if ((buf = sshbuf_new()) == NULL) 1075 fatal("%s: sshbuf_new failed", __func__); 1076 1077 /* Gather keys */ 1078 va_start(ap, string); 1079 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 1080 keys[num_keys].key = va_arg(ap, char *); 1081 if (keys[num_keys].key == NULL) 1082 break; 1083 keys[num_keys].repl = va_arg(ap, char *); 1084 if (keys[num_keys].repl == NULL) 1085 fatal("%s: NULL replacement", __func__); 1086 } 1087 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 1088 fatal("%s: too many keys", __func__); 1089 va_end(ap); 1090 1091 /* Expand string */ 1092 for (i = 0; *string != '\0'; string++) { 1093 if (*string != '%') { 1094 append: 1095 if ((r = sshbuf_put_u8(buf, *string)) != 0) { 1096 fatal("%s: sshbuf_put_u8: %s", 1097 __func__, ssh_err(r)); 1098 } 1099 continue; 1100 } 1101 string++; 1102 /* %% case */ 1103 if (*string == '%') 1104 goto append; 1105 if (*string == '\0') 1106 fatal("%s: invalid format", __func__); 1107 for (i = 0; i < num_keys; i++) { 1108 if (strchr(keys[i].key, *string) != NULL) { 1109 if ((r = sshbuf_put(buf, keys[i].repl, 1110 strlen(keys[i].repl))) != 0) { 1111 fatal("%s: sshbuf_put: %s", 1112 __func__, ssh_err(r)); 1113 } 1114 break; 1115 } 1116 } 1117 if (i >= num_keys) 1118 fatal("%s: unknown key %%%c", __func__, *string); 1119 } 1120 if ((ret = sshbuf_dup_string(buf)) == NULL) 1121 fatal("%s: sshbuf_dup_string failed", __func__); 1122 sshbuf_free(buf); 1123 return ret; 1124 #undef EXPAND_MAX_KEYS 1125 } 1126 1127 int 1128 tun_open(int tun, int mode, char **ifname) 1129 { 1130 #if defined(CUSTOM_SYS_TUN_OPEN) 1131 return (sys_tun_open(tun, mode, ifname)); 1132 #elif defined(SSH_TUN_OPENBSD) 1133 struct ifreq ifr; 1134 char name[100]; 1135 int fd = -1, sock; 1136 const char *tunbase = "tun"; 1137 1138 if (ifname != NULL) 1139 *ifname = NULL; 1140 1141 if (mode == SSH_TUNMODE_ETHERNET) 1142 tunbase = "tap"; 1143 1144 /* Open the tunnel device */ 1145 if (tun <= SSH_TUNID_MAX) { 1146 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); 1147 fd = open(name, O_RDWR); 1148 } else if (tun == SSH_TUNID_ANY) { 1149 for (tun = 100; tun >= 0; tun--) { 1150 snprintf(name, sizeof(name), "/dev/%s%d", 1151 tunbase, tun); 1152 if ((fd = open(name, O_RDWR)) >= 0) 1153 break; 1154 } 1155 } else { 1156 debug("%s: invalid tunnel %u", __func__, tun); 1157 return -1; 1158 } 1159 1160 if (fd == -1) { 1161 debug("%s: %s open: %s", __func__, name, strerror(errno)); 1162 return -1; 1163 } 1164 1165 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 1166 1167 /* Bring interface up if it is not already */ 1168 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); 1169 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 1170 goto failed; 1171 1172 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { 1173 debug("%s: get interface %s flags: %s", __func__, 1174 ifr.ifr_name, strerror(errno)); 1175 goto failed; 1176 } 1177 1178 if (!(ifr.ifr_flags & IFF_UP)) { 1179 ifr.ifr_flags |= IFF_UP; 1180 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { 1181 debug("%s: activate interface %s: %s", __func__, 1182 ifr.ifr_name, strerror(errno)); 1183 goto failed; 1184 } 1185 } 1186 1187 if (ifname != NULL) 1188 *ifname = xstrdup(ifr.ifr_name); 1189 1190 close(sock); 1191 return fd; 1192 1193 failed: 1194 if (fd >= 0) 1195 close(fd); 1196 if (sock >= 0) 1197 close(sock); 1198 return -1; 1199 #else 1200 error("Tunnel interfaces are not supported on this platform"); 1201 return (-1); 1202 #endif 1203 } 1204 1205 void 1206 sanitise_stdfd(void) 1207 { 1208 int nullfd, dupfd; 1209 1210 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 1211 fprintf(stderr, "Couldn't open /dev/null: %s\n", 1212 strerror(errno)); 1213 exit(1); 1214 } 1215 while (++dupfd <= STDERR_FILENO) { 1216 /* Only populate closed fds. */ 1217 if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { 1218 if (dup2(nullfd, dupfd) == -1) { 1219 fprintf(stderr, "dup2: %s\n", strerror(errno)); 1220 exit(1); 1221 } 1222 } 1223 } 1224 if (nullfd > STDERR_FILENO) 1225 close(nullfd); 1226 } 1227 1228 char * 1229 tohex(const void *vp, size_t l) 1230 { 1231 const u_char *p = (const u_char *)vp; 1232 char b[3], *r; 1233 size_t i, hl; 1234 1235 if (l > 65536) 1236 return xstrdup("tohex: length > 65536"); 1237 1238 hl = l * 2 + 1; 1239 r = xcalloc(1, hl); 1240 for (i = 0; i < l; i++) { 1241 snprintf(b, sizeof(b), "%02x", p[i]); 1242 strlcat(r, b, hl); 1243 } 1244 return (r); 1245 } 1246 1247 /* 1248 * Extend string *sp by the specified format. If *sp is not NULL (or empty), 1249 * then the separator 'sep' will be prepended before the formatted arguments. 1250 * Extended strings are heap allocated. 1251 */ 1252 void 1253 xextendf(char **sp, const char *sep, const char *fmt, ...) 1254 { 1255 va_list ap; 1256 char *tmp1, *tmp2; 1257 1258 va_start(ap, fmt); 1259 xvasprintf(&tmp1, fmt, ap); 1260 va_end(ap); 1261 1262 if (*sp == NULL || **sp == '\0') { 1263 free(*sp); 1264 *sp = tmp1; 1265 return; 1266 } 1267 xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1); 1268 free(tmp1); 1269 free(*sp); 1270 *sp = tmp2; 1271 } 1272 1273 1274 u_int64_t 1275 get_u64(const void *vp) 1276 { 1277 const u_char *p = (const u_char *)vp; 1278 u_int64_t v; 1279 1280 v = (u_int64_t)p[0] << 56; 1281 v |= (u_int64_t)p[1] << 48; 1282 v |= (u_int64_t)p[2] << 40; 1283 v |= (u_int64_t)p[3] << 32; 1284 v |= (u_int64_t)p[4] << 24; 1285 v |= (u_int64_t)p[5] << 16; 1286 v |= (u_int64_t)p[6] << 8; 1287 v |= (u_int64_t)p[7]; 1288 1289 return (v); 1290 } 1291 1292 u_int32_t 1293 get_u32(const void *vp) 1294 { 1295 const u_char *p = (const u_char *)vp; 1296 u_int32_t v; 1297 1298 v = (u_int32_t)p[0] << 24; 1299 v |= (u_int32_t)p[1] << 16; 1300 v |= (u_int32_t)p[2] << 8; 1301 v |= (u_int32_t)p[3]; 1302 1303 return (v); 1304 } 1305 1306 u_int32_t 1307 get_u32_le(const void *vp) 1308 { 1309 const u_char *p = (const u_char *)vp; 1310 u_int32_t v; 1311 1312 v = (u_int32_t)p[0]; 1313 v |= (u_int32_t)p[1] << 8; 1314 v |= (u_int32_t)p[2] << 16; 1315 v |= (u_int32_t)p[3] << 24; 1316 1317 return (v); 1318 } 1319 1320 u_int16_t 1321 get_u16(const void *vp) 1322 { 1323 const u_char *p = (const u_char *)vp; 1324 u_int16_t v; 1325 1326 v = (u_int16_t)p[0] << 8; 1327 v |= (u_int16_t)p[1]; 1328 1329 return (v); 1330 } 1331 1332 void 1333 put_u64(void *vp, u_int64_t v) 1334 { 1335 u_char *p = (u_char *)vp; 1336 1337 p[0] = (u_char)(v >> 56) & 0xff; 1338 p[1] = (u_char)(v >> 48) & 0xff; 1339 p[2] = (u_char)(v >> 40) & 0xff; 1340 p[3] = (u_char)(v >> 32) & 0xff; 1341 p[4] = (u_char)(v >> 24) & 0xff; 1342 p[5] = (u_char)(v >> 16) & 0xff; 1343 p[6] = (u_char)(v >> 8) & 0xff; 1344 p[7] = (u_char)v & 0xff; 1345 } 1346 1347 void 1348 put_u32(void *vp, u_int32_t v) 1349 { 1350 u_char *p = (u_char *)vp; 1351 1352 p[0] = (u_char)(v >> 24) & 0xff; 1353 p[1] = (u_char)(v >> 16) & 0xff; 1354 p[2] = (u_char)(v >> 8) & 0xff; 1355 p[3] = (u_char)v & 0xff; 1356 } 1357 1358 void 1359 put_u32_le(void *vp, u_int32_t v) 1360 { 1361 u_char *p = (u_char *)vp; 1362 1363 p[0] = (u_char)v & 0xff; 1364 p[1] = (u_char)(v >> 8) & 0xff; 1365 p[2] = (u_char)(v >> 16) & 0xff; 1366 p[3] = (u_char)(v >> 24) & 0xff; 1367 } 1368 1369 void 1370 put_u16(void *vp, u_int16_t v) 1371 { 1372 u_char *p = (u_char *)vp; 1373 1374 p[0] = (u_char)(v >> 8) & 0xff; 1375 p[1] = (u_char)v & 0xff; 1376 } 1377 1378 void 1379 ms_subtract_diff(struct timeval *start, int *ms) 1380 { 1381 struct timeval diff, finish; 1382 1383 monotime_tv(&finish); 1384 timersub(&finish, start, &diff); 1385 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 1386 } 1387 1388 void 1389 ms_to_timeval(struct timeval *tv, int ms) 1390 { 1391 if (ms < 0) 1392 ms = 0; 1393 tv->tv_sec = ms / 1000; 1394 tv->tv_usec = (ms % 1000) * 1000; 1395 } 1396 1397 void 1398 monotime_ts(struct timespec *ts) 1399 { 1400 struct timeval tv; 1401 #if defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_BOOTTIME) || \ 1402 defined(CLOCK_MONOTONIC) || defined(CLOCK_REALTIME)) 1403 static int gettime_failed = 0; 1404 1405 if (!gettime_failed) { 1406 # ifdef CLOCK_BOOTTIME 1407 if (clock_gettime(CLOCK_BOOTTIME, ts) == 0) 1408 return; 1409 # endif /* CLOCK_BOOTTIME */ 1410 # ifdef CLOCK_MONOTONIC 1411 if (clock_gettime(CLOCK_MONOTONIC, ts) == 0) 1412 return; 1413 # endif /* CLOCK_MONOTONIC */ 1414 # ifdef CLOCK_REALTIME 1415 /* Not monotonic, but we're almost out of options here. */ 1416 if (clock_gettime(CLOCK_REALTIME, ts) == 0) 1417 return; 1418 # endif /* CLOCK_REALTIME */ 1419 debug3("clock_gettime: %s", strerror(errno)); 1420 gettime_failed = 1; 1421 } 1422 #endif /* HAVE_CLOCK_GETTIME && (BOOTTIME || MONOTONIC || REALTIME) */ 1423 gettimeofday(&tv, NULL); 1424 ts->tv_sec = tv.tv_sec; 1425 ts->tv_nsec = (long)tv.tv_usec * 1000; 1426 } 1427 1428 void 1429 monotime_tv(struct timeval *tv) 1430 { 1431 struct timespec ts; 1432 1433 monotime_ts(&ts); 1434 tv->tv_sec = ts.tv_sec; 1435 tv->tv_usec = ts.tv_nsec / 1000; 1436 } 1437 1438 time_t 1439 monotime(void) 1440 { 1441 struct timespec ts; 1442 1443 monotime_ts(&ts); 1444 return ts.tv_sec; 1445 } 1446 1447 double 1448 monotime_double(void) 1449 { 1450 struct timespec ts; 1451 1452 monotime_ts(&ts); 1453 return ts.tv_sec + ((double)ts.tv_nsec / 1000000000); 1454 } 1455 1456 void 1457 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 1458 { 1459 bw->buflen = buflen; 1460 bw->rate = kbps; 1461 bw->thresh = buflen; 1462 bw->lamt = 0; 1463 timerclear(&bw->bwstart); 1464 timerclear(&bw->bwend); 1465 } 1466 1467 /* Callback from read/write loop to insert bandwidth-limiting delays */ 1468 void 1469 bandwidth_limit(struct bwlimit *bw, size_t read_len) 1470 { 1471 u_int64_t waitlen; 1472 struct timespec ts, rm; 1473 1474 bw->lamt += read_len; 1475 if (!timerisset(&bw->bwstart)) { 1476 monotime_tv(&bw->bwstart); 1477 return; 1478 } 1479 if (bw->lamt < bw->thresh) 1480 return; 1481 1482 monotime_tv(&bw->bwend); 1483 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 1484 if (!timerisset(&bw->bwend)) 1485 return; 1486 1487 bw->lamt *= 8; 1488 waitlen = (double)1000000L * bw->lamt / bw->rate; 1489 1490 bw->bwstart.tv_sec = waitlen / 1000000L; 1491 bw->bwstart.tv_usec = waitlen % 1000000L; 1492 1493 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 1494 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 1495 1496 /* Adjust the wait time */ 1497 if (bw->bwend.tv_sec) { 1498 bw->thresh /= 2; 1499 if (bw->thresh < bw->buflen / 4) 1500 bw->thresh = bw->buflen / 4; 1501 } else if (bw->bwend.tv_usec < 10000) { 1502 bw->thresh *= 2; 1503 if (bw->thresh > bw->buflen * 8) 1504 bw->thresh = bw->buflen * 8; 1505 } 1506 1507 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 1508 while (nanosleep(&ts, &rm) == -1) { 1509 if (errno != EINTR) 1510 break; 1511 ts = rm; 1512 } 1513 } 1514 1515 bw->lamt = 0; 1516 monotime_tv(&bw->bwstart); 1517 } 1518 1519 /* Make a template filename for mk[sd]temp() */ 1520 void 1521 mktemp_proto(char *s, size_t len) 1522 { 1523 const char *tmpdir; 1524 int r; 1525 1526 if ((tmpdir = getenv("TMPDIR")) != NULL) { 1527 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 1528 if (r > 0 && (size_t)r < len) 1529 return; 1530 } 1531 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 1532 if (r < 0 || (size_t)r >= len) 1533 fatal("%s: template string too short", __func__); 1534 } 1535 1536 static const struct { 1537 const char *name; 1538 int value; 1539 } ipqos[] = { 1540 { "none", INT_MAX }, /* can't use 0 here; that's CS0 */ 1541 { "af11", IPTOS_DSCP_AF11 }, 1542 { "af12", IPTOS_DSCP_AF12 }, 1543 { "af13", IPTOS_DSCP_AF13 }, 1544 { "af21", IPTOS_DSCP_AF21 }, 1545 { "af22", IPTOS_DSCP_AF22 }, 1546 { "af23", IPTOS_DSCP_AF23 }, 1547 { "af31", IPTOS_DSCP_AF31 }, 1548 { "af32", IPTOS_DSCP_AF32 }, 1549 { "af33", IPTOS_DSCP_AF33 }, 1550 { "af41", IPTOS_DSCP_AF41 }, 1551 { "af42", IPTOS_DSCP_AF42 }, 1552 { "af43", IPTOS_DSCP_AF43 }, 1553 { "cs0", IPTOS_DSCP_CS0 }, 1554 { "cs1", IPTOS_DSCP_CS1 }, 1555 { "cs2", IPTOS_DSCP_CS2 }, 1556 { "cs3", IPTOS_DSCP_CS3 }, 1557 { "cs4", IPTOS_DSCP_CS4 }, 1558 { "cs5", IPTOS_DSCP_CS5 }, 1559 { "cs6", IPTOS_DSCP_CS6 }, 1560 { "cs7", IPTOS_DSCP_CS7 }, 1561 { "ef", IPTOS_DSCP_EF }, 1562 { "le", IPTOS_DSCP_LE }, 1563 { "lowdelay", IPTOS_LOWDELAY }, 1564 { "throughput", IPTOS_THROUGHPUT }, 1565 { "reliability", IPTOS_RELIABILITY }, 1566 { NULL, -1 } 1567 }; 1568 1569 int 1570 parse_ipqos(const char *cp) 1571 { 1572 u_int i; 1573 char *ep; 1574 long val; 1575 1576 if (cp == NULL) 1577 return -1; 1578 for (i = 0; ipqos[i].name != NULL; i++) { 1579 if (strcasecmp(cp, ipqos[i].name) == 0) 1580 return ipqos[i].value; 1581 } 1582 /* Try parsing as an integer */ 1583 val = strtol(cp, &ep, 0); 1584 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1585 return -1; 1586 return val; 1587 } 1588 1589 const char * 1590 iptos2str(int iptos) 1591 { 1592 int i; 1593 static char iptos_str[sizeof "0xff"]; 1594 1595 for (i = 0; ipqos[i].name != NULL; i++) { 1596 if (ipqos[i].value == iptos) 1597 return ipqos[i].name; 1598 } 1599 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1600 return iptos_str; 1601 } 1602 1603 void 1604 lowercase(char *s) 1605 { 1606 for (; *s; s++) 1607 *s = tolower((u_char)*s); 1608 } 1609 1610 int 1611 unix_listener(const char *path, int backlog, int unlink_first) 1612 { 1613 struct sockaddr_un sunaddr; 1614 int saved_errno, sock; 1615 1616 memset(&sunaddr, 0, sizeof(sunaddr)); 1617 sunaddr.sun_family = AF_UNIX; 1618 if (strlcpy(sunaddr.sun_path, path, 1619 sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { 1620 error("%s: path \"%s\" too long for Unix domain socket", 1621 __func__, path); 1622 errno = ENAMETOOLONG; 1623 return -1; 1624 } 1625 1626 sock = socket(PF_UNIX, SOCK_STREAM, 0); 1627 if (sock == -1) { 1628 saved_errno = errno; 1629 error("%s: socket: %.100s", __func__, strerror(errno)); 1630 errno = saved_errno; 1631 return -1; 1632 } 1633 if (unlink_first == 1) { 1634 if (unlink(path) != 0 && errno != ENOENT) 1635 error("unlink(%s): %.100s", path, strerror(errno)); 1636 } 1637 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) { 1638 saved_errno = errno; 1639 error("%s: cannot bind to path %s: %s", 1640 __func__, path, strerror(errno)); 1641 close(sock); 1642 errno = saved_errno; 1643 return -1; 1644 } 1645 if (listen(sock, backlog) == -1) { 1646 saved_errno = errno; 1647 error("%s: cannot listen on path %s: %s", 1648 __func__, path, strerror(errno)); 1649 close(sock); 1650 unlink(path); 1651 errno = saved_errno; 1652 return -1; 1653 } 1654 return sock; 1655 } 1656 1657 void 1658 sock_set_v6only(int s) 1659 { 1660 #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) 1661 int on = 1; 1662 1663 debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); 1664 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) 1665 error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); 1666 #endif 1667 } 1668 1669 /* 1670 * Compares two strings that maybe be NULL. Returns non-zero if strings 1671 * are both NULL or are identical, returns zero otherwise. 1672 */ 1673 static int 1674 strcmp_maybe_null(const char *a, const char *b) 1675 { 1676 if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) 1677 return 0; 1678 if (a != NULL && strcmp(a, b) != 0) 1679 return 0; 1680 return 1; 1681 } 1682 1683 /* 1684 * Compare two forwards, returning non-zero if they are identical or 1685 * zero otherwise. 1686 */ 1687 int 1688 forward_equals(const struct Forward *a, const struct Forward *b) 1689 { 1690 if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) 1691 return 0; 1692 if (a->listen_port != b->listen_port) 1693 return 0; 1694 if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) 1695 return 0; 1696 if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) 1697 return 0; 1698 if (a->connect_port != b->connect_port) 1699 return 0; 1700 if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) 1701 return 0; 1702 /* allocated_port and handle are not checked */ 1703 return 1; 1704 } 1705 1706 /* returns 1 if process is already daemonized, 0 otherwise */ 1707 int 1708 daemonized(void) 1709 { 1710 int fd; 1711 1712 if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) { 1713 close(fd); 1714 return 0; /* have controlling terminal */ 1715 } 1716 if (getppid() != 1) 1717 return 0; /* parent is not init */ 1718 if (getsid(0) != getpid()) 1719 return 0; /* not session leader */ 1720 debug3("already daemonized"); 1721 return 1; 1722 } 1723 1724 1725 /* 1726 * Splits 's' into an argument vector. Handles quoted string and basic 1727 * escape characters (\\, \", \'). Caller must free the argument vector 1728 * and its members. 1729 */ 1730 int 1731 argv_split(const char *s, int *argcp, char ***argvp) 1732 { 1733 int r = SSH_ERR_INTERNAL_ERROR; 1734 int argc = 0, quote, i, j; 1735 char *arg, **argv = xcalloc(1, sizeof(*argv)); 1736 1737 *argvp = NULL; 1738 *argcp = 0; 1739 1740 for (i = 0; s[i] != '\0'; i++) { 1741 /* Skip leading whitespace */ 1742 if (s[i] == ' ' || s[i] == '\t') 1743 continue; 1744 1745 /* Start of a token */ 1746 quote = 0; 1747 if (s[i] == '\\' && 1748 (s[i + 1] == '\'' || s[i + 1] == '\"' || s[i + 1] == '\\')) 1749 i++; 1750 else if (s[i] == '\'' || s[i] == '"') 1751 quote = s[i++]; 1752 1753 argv = xreallocarray(argv, (argc + 2), sizeof(*argv)); 1754 arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1); 1755 argv[argc] = NULL; 1756 1757 /* Copy the token in, removing escapes */ 1758 for (j = 0; s[i] != '\0'; i++) { 1759 if (s[i] == '\\') { 1760 if (s[i + 1] == '\'' || 1761 s[i + 1] == '\"' || 1762 s[i + 1] == '\\') { 1763 i++; /* Skip '\' */ 1764 arg[j++] = s[i]; 1765 } else { 1766 /* Unrecognised escape */ 1767 arg[j++] = s[i]; 1768 } 1769 } else if (quote == 0 && (s[i] == ' ' || s[i] == '\t')) 1770 break; /* done */ 1771 else if (quote != 0 && s[i] == quote) 1772 break; /* done */ 1773 else 1774 arg[j++] = s[i]; 1775 } 1776 if (s[i] == '\0') { 1777 if (quote != 0) { 1778 /* Ran out of string looking for close quote */ 1779 r = SSH_ERR_INVALID_FORMAT; 1780 goto out; 1781 } 1782 break; 1783 } 1784 } 1785 /* Success */ 1786 *argcp = argc; 1787 *argvp = argv; 1788 argc = 0; 1789 argv = NULL; 1790 r = 0; 1791 out: 1792 if (argc != 0 && argv != NULL) { 1793 for (i = 0; i < argc; i++) 1794 free(argv[i]); 1795 free(argv); 1796 } 1797 return r; 1798 } 1799 1800 /* 1801 * Reassemble an argument vector into a string, quoting and escaping as 1802 * necessary. Caller must free returned string. 1803 */ 1804 char * 1805 argv_assemble(int argc, char **argv) 1806 { 1807 int i, j, ws, r; 1808 char c, *ret; 1809 struct sshbuf *buf, *arg; 1810 1811 if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL) 1812 fatal("%s: sshbuf_new failed", __func__); 1813 1814 for (i = 0; i < argc; i++) { 1815 ws = 0; 1816 sshbuf_reset(arg); 1817 for (j = 0; argv[i][j] != '\0'; j++) { 1818 r = 0; 1819 c = argv[i][j]; 1820 switch (c) { 1821 case ' ': 1822 case '\t': 1823 ws = 1; 1824 r = sshbuf_put_u8(arg, c); 1825 break; 1826 case '\\': 1827 case '\'': 1828 case '"': 1829 if ((r = sshbuf_put_u8(arg, '\\')) != 0) 1830 break; 1831 /* FALLTHROUGH */ 1832 default: 1833 r = sshbuf_put_u8(arg, c); 1834 break; 1835 } 1836 if (r != 0) 1837 fatal("%s: sshbuf_put_u8: %s", 1838 __func__, ssh_err(r)); 1839 } 1840 if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) || 1841 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) || 1842 (r = sshbuf_putb(buf, arg)) != 0 || 1843 (ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0)) 1844 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 1845 } 1846 if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL) 1847 fatal("%s: malloc failed", __func__); 1848 memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf)); 1849 ret[sshbuf_len(buf)] = '\0'; 1850 sshbuf_free(buf); 1851 sshbuf_free(arg); 1852 return ret; 1853 } 1854 1855 /* Returns 0 if pid exited cleanly, non-zero otherwise */ 1856 int 1857 exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet) 1858 { 1859 int status; 1860 1861 while (waitpid(pid, &status, 0) == -1) { 1862 if (errno != EINTR) { 1863 error("%s: waitpid: %s", tag, strerror(errno)); 1864 return -1; 1865 } 1866 } 1867 if (WIFSIGNALED(status)) { 1868 error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status)); 1869 return -1; 1870 } else if (WEXITSTATUS(status) != 0) { 1871 do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO, 1872 "%s %s failed, status %d", tag, cmd, WEXITSTATUS(status)); 1873 return -1; 1874 } 1875 return 0; 1876 } 1877 1878 /* 1879 * Check a given path for security. This is defined as all components 1880 * of the path to the file must be owned by either the owner of 1881 * of the file or root and no directories must be group or world writable. 1882 * 1883 * XXX Should any specific check be done for sym links ? 1884 * 1885 * Takes a file name, its stat information (preferably from fstat() to 1886 * avoid races), the uid of the expected owner, their home directory and an 1887 * error buffer plus max size as arguments. 1888 * 1889 * Returns 0 on success and -1 on failure 1890 */ 1891 int 1892 safe_path(const char *name, struct stat *stp, const char *pw_dir, 1893 uid_t uid, char *err, size_t errlen) 1894 { 1895 char buf[PATH_MAX], homedir[PATH_MAX]; 1896 char *cp; 1897 int comparehome = 0; 1898 struct stat st; 1899 1900 if (realpath(name, buf) == NULL) { 1901 snprintf(err, errlen, "realpath %s failed: %s", name, 1902 strerror(errno)); 1903 return -1; 1904 } 1905 if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL) 1906 comparehome = 1; 1907 1908 if (!S_ISREG(stp->st_mode)) { 1909 snprintf(err, errlen, "%s is not a regular file", buf); 1910 return -1; 1911 } 1912 if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) || 1913 (stp->st_mode & 022) != 0) { 1914 snprintf(err, errlen, "bad ownership or modes for file %s", 1915 buf); 1916 return -1; 1917 } 1918 1919 /* for each component of the canonical path, walking upwards */ 1920 for (;;) { 1921 if ((cp = dirname(buf)) == NULL) { 1922 snprintf(err, errlen, "dirname() failed"); 1923 return -1; 1924 } 1925 strlcpy(buf, cp, sizeof(buf)); 1926 1927 if (stat(buf, &st) == -1 || 1928 (!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) || 1929 (st.st_mode & 022) != 0) { 1930 snprintf(err, errlen, 1931 "bad ownership or modes for directory %s", buf); 1932 return -1; 1933 } 1934 1935 /* If are past the homedir then we can stop */ 1936 if (comparehome && strcmp(homedir, buf) == 0) 1937 break; 1938 1939 /* 1940 * dirname should always complete with a "/" path, 1941 * but we can be paranoid and check for "." too 1942 */ 1943 if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0)) 1944 break; 1945 } 1946 return 0; 1947 } 1948 1949 /* 1950 * Version of safe_path() that accepts an open file descriptor to 1951 * avoid races. 1952 * 1953 * Returns 0 on success and -1 on failure 1954 */ 1955 int 1956 safe_path_fd(int fd, const char *file, struct passwd *pw, 1957 char *err, size_t errlen) 1958 { 1959 struct stat st; 1960 1961 /* check the open file to avoid races */ 1962 if (fstat(fd, &st) == -1) { 1963 snprintf(err, errlen, "cannot stat file %s: %s", 1964 file, strerror(errno)); 1965 return -1; 1966 } 1967 return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen); 1968 } 1969 1970 /* 1971 * Sets the value of the given variable in the environment. If the variable 1972 * already exists, its value is overridden. 1973 */ 1974 void 1975 child_set_env(char ***envp, u_int *envsizep, const char *name, 1976 const char *value) 1977 { 1978 char **env; 1979 u_int envsize; 1980 u_int i, namelen; 1981 1982 if (strchr(name, '=') != NULL) { 1983 error("Invalid environment variable \"%.100s\"", name); 1984 return; 1985 } 1986 1987 /* 1988 * If we're passed an uninitialized list, allocate a single null 1989 * entry before continuing. 1990 */ 1991 if (*envp == NULL && *envsizep == 0) { 1992 *envp = xmalloc(sizeof(char *)); 1993 *envp[0] = NULL; 1994 *envsizep = 1; 1995 } 1996 1997 /* 1998 * Find the slot where the value should be stored. If the variable 1999 * already exists, we reuse the slot; otherwise we append a new slot 2000 * at the end of the array, expanding if necessary. 2001 */ 2002 env = *envp; 2003 namelen = strlen(name); 2004 for (i = 0; env[i]; i++) 2005 if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') 2006 break; 2007 if (env[i]) { 2008 /* Reuse the slot. */ 2009 free(env[i]); 2010 } else { 2011 /* New variable. Expand if necessary. */ 2012 envsize = *envsizep; 2013 if (i >= envsize - 1) { 2014 if (envsize >= 1000) 2015 fatal("child_set_env: too many env vars"); 2016 envsize += 50; 2017 env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); 2018 *envsizep = envsize; 2019 } 2020 /* Need to set the NULL pointer at end of array beyond the new slot. */ 2021 env[i + 1] = NULL; 2022 } 2023 2024 /* Allocate space and format the variable in the appropriate slot. */ 2025 /* XXX xasprintf */ 2026 env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); 2027 snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); 2028 } 2029 2030 /* 2031 * Check and optionally lowercase a domain name, also removes trailing '.' 2032 * Returns 1 on success and 0 on failure, storing an error message in errstr. 2033 */ 2034 int 2035 valid_domain(char *name, int makelower, const char **errstr) 2036 { 2037 size_t i, l = strlen(name); 2038 u_char c, last = '\0'; 2039 static char errbuf[256]; 2040 2041 if (l == 0) { 2042 strlcpy(errbuf, "empty domain name", sizeof(errbuf)); 2043 goto bad; 2044 } 2045 if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) { 2046 snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" " 2047 "starts with invalid character", name); 2048 goto bad; 2049 } 2050 for (i = 0; i < l; i++) { 2051 c = tolower((u_char)name[i]); 2052 if (makelower) 2053 name[i] = (char)c; 2054 if (last == '.' && c == '.') { 2055 snprintf(errbuf, sizeof(errbuf), "domain name " 2056 "\"%.100s\" contains consecutive separators", name); 2057 goto bad; 2058 } 2059 if (c != '.' && c != '-' && !isalnum(c) && 2060 c != '_') /* technically invalid, but common */ { 2061 snprintf(errbuf, sizeof(errbuf), "domain name " 2062 "\"%.100s\" contains invalid characters", name); 2063 goto bad; 2064 } 2065 last = c; 2066 } 2067 if (name[l - 1] == '.') 2068 name[l - 1] = '\0'; 2069 if (errstr != NULL) 2070 *errstr = NULL; 2071 return 1; 2072 bad: 2073 if (errstr != NULL) 2074 *errstr = errbuf; 2075 return 0; 2076 } 2077 2078 /* 2079 * Verify that a environment variable name (not including initial '$') is 2080 * valid; consisting of one or more alphanumeric or underscore characters only. 2081 * Returns 1 on valid, 0 otherwise. 2082 */ 2083 int 2084 valid_env_name(const char *name) 2085 { 2086 const char *cp; 2087 2088 if (name[0] == '\0') 2089 return 0; 2090 for (cp = name; *cp != '\0'; cp++) { 2091 if (!isalnum((u_char)*cp) && *cp != '_') 2092 return 0; 2093 } 2094 return 1; 2095 } 2096 2097 const char * 2098 atoi_err(const char *nptr, int *val) 2099 { 2100 const char *errstr = NULL; 2101 long long num; 2102 2103 if (nptr == NULL || *nptr == '\0') 2104 return "missing"; 2105 num = strtonum(nptr, 0, INT_MAX, &errstr); 2106 if (errstr == NULL) 2107 *val = (int)num; 2108 return errstr; 2109 } 2110 2111 int 2112 parse_absolute_time(const char *s, uint64_t *tp) 2113 { 2114 struct tm tm; 2115 time_t tt; 2116 char buf[32], *fmt; 2117 2118 *tp = 0; 2119 2120 /* 2121 * POSIX strptime says "The application shall ensure that there 2122 * is white-space or other non-alphanumeric characters between 2123 * any two conversion specifications" so arrange things this way. 2124 */ 2125 switch (strlen(s)) { 2126 case 8: /* YYYYMMDD */ 2127 fmt = "%Y-%m-%d"; 2128 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6); 2129 break; 2130 case 12: /* YYYYMMDDHHMM */ 2131 fmt = "%Y-%m-%dT%H:%M"; 2132 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s", 2133 s, s + 4, s + 6, s + 8, s + 10); 2134 break; 2135 case 14: /* YYYYMMDDHHMMSS */ 2136 fmt = "%Y-%m-%dT%H:%M:%S"; 2137 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s", 2138 s, s + 4, s + 6, s + 8, s + 10, s + 12); 2139 break; 2140 default: 2141 return SSH_ERR_INVALID_FORMAT; 2142 } 2143 2144 memset(&tm, 0, sizeof(tm)); 2145 if (strptime(buf, fmt, &tm) == NULL) 2146 return SSH_ERR_INVALID_FORMAT; 2147 if ((tt = mktime(&tm)) < 0) 2148 return SSH_ERR_INVALID_FORMAT; 2149 /* success */ 2150 *tp = (uint64_t)tt; 2151 return 0; 2152 } 2153 2154 void 2155 format_absolute_time(uint64_t t, char *buf, size_t len) 2156 { 2157 time_t tt = t > INT_MAX ? INT_MAX : t; /* XXX revisit in 2038 :P */ 2158 struct tm tm; 2159 2160 localtime_r(&tt, &tm); 2161 strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm); 2162 } 2163 2164 /* check if path is absolute */ 2165 int 2166 path_absolute(const char *path) 2167 { 2168 return (*path == '/') ? 1 : 0; 2169 } 2170 2171 void 2172 skip_space(char **cpp) 2173 { 2174 char *cp; 2175 2176 for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++) 2177 ; 2178 *cpp = cp; 2179 } 2180 2181 /* authorized_key-style options parsing helpers */ 2182 2183 /* 2184 * Match flag 'opt' in *optsp, and if allow_negate is set then also match 2185 * 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0 2186 * if negated option matches. 2187 * If the option or negated option matches, then *optsp is updated to 2188 * point to the first character after the option. 2189 */ 2190 int 2191 opt_flag(const char *opt, int allow_negate, const char **optsp) 2192 { 2193 size_t opt_len = strlen(opt); 2194 const char *opts = *optsp; 2195 int negate = 0; 2196 2197 if (allow_negate && strncasecmp(opts, "no-", 3) == 0) { 2198 opts += 3; 2199 negate = 1; 2200 } 2201 if (strncasecmp(opts, opt, opt_len) == 0) { 2202 *optsp = opts + opt_len; 2203 return negate ? 0 : 1; 2204 } 2205 return -1; 2206 } 2207 2208 char * 2209 opt_dequote(const char **sp, const char **errstrp) 2210 { 2211 const char *s = *sp; 2212 char *ret; 2213 size_t i; 2214 2215 *errstrp = NULL; 2216 if (*s != '"') { 2217 *errstrp = "missing start quote"; 2218 return NULL; 2219 } 2220 s++; 2221 if ((ret = malloc(strlen((s)) + 1)) == NULL) { 2222 *errstrp = "memory allocation failed"; 2223 return NULL; 2224 } 2225 for (i = 0; *s != '\0' && *s != '"';) { 2226 if (s[0] == '\\' && s[1] == '"') 2227 s++; 2228 ret[i++] = *s++; 2229 } 2230 if (*s == '\0') { 2231 *errstrp = "missing end quote"; 2232 free(ret); 2233 return NULL; 2234 } 2235 ret[i] = '\0'; 2236 s++; 2237 *sp = s; 2238 return ret; 2239 } 2240 2241 int 2242 opt_match(const char **opts, const char *term) 2243 { 2244 if (strncasecmp((*opts), term, strlen(term)) == 0 && 2245 (*opts)[strlen(term)] == '=') { 2246 *opts += strlen(term) + 1; 2247 return 1; 2248 } 2249 return 0; 2250 } 2251 2252 sshsig_t 2253 ssh_signal(int signum, sshsig_t handler) 2254 { 2255 struct sigaction sa, osa; 2256 2257 /* mask all other signals while in handler */ 2258 memset(&sa, 0, sizeof(sa)); 2259 sa.sa_handler = handler; 2260 sigfillset(&sa.sa_mask); 2261 #if defined(SA_RESTART) && !defined(NO_SA_RESTART) 2262 if (signum != SIGALRM) 2263 sa.sa_flags = SA_RESTART; 2264 #endif 2265 if (sigaction(signum, &sa, &osa) == -1) { 2266 debug3("sigaction(%s): %s", strsignal(signum), strerror(errno)); 2267 return SIG_ERR; 2268 } 2269 return osa.sa_handler; 2270 } 2271