1 /* $OpenBSD: misc.c,v 1.105 2016/07/15 00:24:30 djm 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/time.h> 33 #include <sys/un.h> 34 35 #include <limits.h> 36 #include <stdarg.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <time.h> 41 #include <unistd.h> 42 43 #include <netinet/in.h> 44 #include <netinet/in_systm.h> 45 #include <netinet/ip.h> 46 #include <netinet/tcp.h> 47 48 #include <ctype.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <netdb.h> 52 #ifdef HAVE_PATHS_H 53 # include <paths.h> 54 #include <pwd.h> 55 #endif 56 #ifdef SSH_TUN_OPENBSD 57 #include <net/if.h> 58 #endif 59 60 #include "xmalloc.h" 61 #include "misc.h" 62 #include "log.h" 63 #include "ssh.h" 64 65 /* remove newline at end of string */ 66 char * 67 chop(char *s) 68 { 69 char *t = s; 70 while (*t) { 71 if (*t == '\n' || *t == '\r') { 72 *t = '\0'; 73 return s; 74 } 75 t++; 76 } 77 return s; 78 79 } 80 81 /* set/unset filedescriptor to non-blocking */ 82 int 83 set_nonblock(int fd) 84 { 85 int val; 86 87 val = fcntl(fd, F_GETFL); 88 if (val < 0) { 89 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 90 return (-1); 91 } 92 if (val & O_NONBLOCK) { 93 debug3("fd %d is O_NONBLOCK", fd); 94 return (0); 95 } 96 debug2("fd %d setting O_NONBLOCK", fd); 97 val |= O_NONBLOCK; 98 if (fcntl(fd, F_SETFL, val) == -1) { 99 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 100 strerror(errno)); 101 return (-1); 102 } 103 return (0); 104 } 105 106 int 107 unset_nonblock(int fd) 108 { 109 int val; 110 111 val = fcntl(fd, F_GETFL); 112 if (val < 0) { 113 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 114 return (-1); 115 } 116 if (!(val & O_NONBLOCK)) { 117 debug3("fd %d is not O_NONBLOCK", fd); 118 return (0); 119 } 120 debug("fd %d clearing O_NONBLOCK", fd); 121 val &= ~O_NONBLOCK; 122 if (fcntl(fd, F_SETFL, val) == -1) { 123 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 124 fd, strerror(errno)); 125 return (-1); 126 } 127 return (0); 128 } 129 130 const char * 131 ssh_gai_strerror(int gaierr) 132 { 133 if (gaierr == EAI_SYSTEM && errno != 0) 134 return strerror(errno); 135 return gai_strerror(gaierr); 136 } 137 138 /* disable nagle on socket */ 139 void 140 set_nodelay(int fd) 141 { 142 int opt; 143 socklen_t optlen; 144 145 optlen = sizeof opt; 146 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 147 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 148 return; 149 } 150 if (opt == 1) { 151 debug2("fd %d is TCP_NODELAY", fd); 152 return; 153 } 154 opt = 1; 155 debug2("fd %d setting TCP_NODELAY", fd); 156 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 157 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 158 } 159 160 /* Characters considered whitespace in strsep calls. */ 161 #define WHITESPACE " \t\r\n" 162 #define QUOTE "\"" 163 164 /* return next token in configuration line */ 165 char * 166 strdelim(char **s) 167 { 168 char *old; 169 int wspace = 0; 170 171 if (*s == NULL) 172 return NULL; 173 174 old = *s; 175 176 *s = strpbrk(*s, WHITESPACE QUOTE "="); 177 if (*s == NULL) 178 return (old); 179 180 if (*s[0] == '\"') { 181 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 182 /* Find matching quote */ 183 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 184 return (NULL); /* no matching quote */ 185 } else { 186 *s[0] = '\0'; 187 *s += strspn(*s + 1, WHITESPACE) + 1; 188 return (old); 189 } 190 } 191 192 /* Allow only one '=' to be skipped */ 193 if (*s[0] == '=') 194 wspace = 1; 195 *s[0] = '\0'; 196 197 /* Skip any extra whitespace after first token */ 198 *s += strspn(*s + 1, WHITESPACE) + 1; 199 if (*s[0] == '=' && !wspace) 200 *s += strspn(*s + 1, WHITESPACE) + 1; 201 202 return (old); 203 } 204 205 struct passwd * 206 pwcopy(struct passwd *pw) 207 { 208 struct passwd *copy = xcalloc(1, sizeof(*copy)); 209 210 copy->pw_name = xstrdup(pw->pw_name); 211 copy->pw_passwd = xstrdup(pw->pw_passwd); 212 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 213 copy->pw_gecos = xstrdup(pw->pw_gecos); 214 #endif 215 copy->pw_uid = pw->pw_uid; 216 copy->pw_gid = pw->pw_gid; 217 #ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE 218 copy->pw_expire = pw->pw_expire; 219 #endif 220 #ifdef HAVE_STRUCT_PASSWD_PW_CHANGE 221 copy->pw_change = pw->pw_change; 222 #endif 223 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 224 copy->pw_class = xstrdup(pw->pw_class); 225 #endif 226 copy->pw_dir = xstrdup(pw->pw_dir); 227 copy->pw_shell = xstrdup(pw->pw_shell); 228 return copy; 229 } 230 231 /* 232 * Convert ASCII string to TCP/IP port number. 233 * Port must be >=0 and <=65535. 234 * Return -1 if invalid. 235 */ 236 int 237 a2port(const char *s) 238 { 239 long long port; 240 const char *errstr; 241 242 port = strtonum(s, 0, 65535, &errstr); 243 if (errstr != NULL) 244 return -1; 245 return (int)port; 246 } 247 248 int 249 a2tun(const char *s, int *remote) 250 { 251 const char *errstr = NULL; 252 char *sp, *ep; 253 int tun; 254 255 if (remote != NULL) { 256 *remote = SSH_TUNID_ANY; 257 sp = xstrdup(s); 258 if ((ep = strchr(sp, ':')) == NULL) { 259 free(sp); 260 return (a2tun(s, NULL)); 261 } 262 ep[0] = '\0'; ep++; 263 *remote = a2tun(ep, NULL); 264 tun = a2tun(sp, NULL); 265 free(sp); 266 return (*remote == SSH_TUNID_ERR ? *remote : tun); 267 } 268 269 if (strcasecmp(s, "any") == 0) 270 return (SSH_TUNID_ANY); 271 272 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 273 if (errstr != NULL) 274 return (SSH_TUNID_ERR); 275 276 return (tun); 277 } 278 279 #define SECONDS 1 280 #define MINUTES (SECONDS * 60) 281 #define HOURS (MINUTES * 60) 282 #define DAYS (HOURS * 24) 283 #define WEEKS (DAYS * 7) 284 285 /* 286 * Convert a time string into seconds; format is 287 * a sequence of: 288 * time[qualifier] 289 * 290 * Valid time qualifiers are: 291 * <none> seconds 292 * s|S seconds 293 * m|M minutes 294 * h|H hours 295 * d|D days 296 * w|W weeks 297 * 298 * Examples: 299 * 90m 90 minutes 300 * 1h30m 90 minutes 301 * 2d 2 days 302 * 1w 1 week 303 * 304 * Return -1 if time string is invalid. 305 */ 306 long 307 convtime(const char *s) 308 { 309 long total, secs; 310 const char *p; 311 char *endp; 312 313 errno = 0; 314 total = 0; 315 p = s; 316 317 if (p == NULL || *p == '\0') 318 return -1; 319 320 while (*p) { 321 secs = strtol(p, &endp, 10); 322 if (p == endp || 323 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || 324 secs < 0) 325 return -1; 326 327 switch (*endp++) { 328 case '\0': 329 endp--; 330 break; 331 case 's': 332 case 'S': 333 break; 334 case 'm': 335 case 'M': 336 secs *= MINUTES; 337 break; 338 case 'h': 339 case 'H': 340 secs *= HOURS; 341 break; 342 case 'd': 343 case 'D': 344 secs *= DAYS; 345 break; 346 case 'w': 347 case 'W': 348 secs *= WEEKS; 349 break; 350 default: 351 return -1; 352 } 353 total += secs; 354 if (total < 0) 355 return -1; 356 p = endp; 357 } 358 359 return total; 360 } 361 362 /* 363 * Returns a standardized host+port identifier string. 364 * Caller must free returned string. 365 */ 366 char * 367 put_host_port(const char *host, u_short port) 368 { 369 char *hoststr; 370 371 if (port == 0 || port == SSH_DEFAULT_PORT) 372 return(xstrdup(host)); 373 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) 374 fatal("put_host_port: asprintf: %s", strerror(errno)); 375 debug3("put_host_port: %s", hoststr); 376 return hoststr; 377 } 378 379 /* 380 * Search for next delimiter between hostnames/addresses and ports. 381 * Argument may be modified (for termination). 382 * Returns *cp if parsing succeeds. 383 * *cp is set to the start of the next delimiter, if one was found. 384 * If this is the last field, *cp is set to NULL. 385 */ 386 char * 387 hpdelim(char **cp) 388 { 389 char *s, *old; 390 391 if (cp == NULL || *cp == NULL) 392 return NULL; 393 394 old = s = *cp; 395 if (*s == '[') { 396 if ((s = strchr(s, ']')) == NULL) 397 return NULL; 398 else 399 s++; 400 } else if ((s = strpbrk(s, ":/")) == NULL) 401 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 402 403 switch (*s) { 404 case '\0': 405 *cp = NULL; /* no more fields*/ 406 break; 407 408 case ':': 409 case '/': 410 *s = '\0'; /* terminate */ 411 *cp = s + 1; 412 break; 413 414 default: 415 return NULL; 416 } 417 418 return old; 419 } 420 421 char * 422 cleanhostname(char *host) 423 { 424 if (*host == '[' && host[strlen(host) - 1] == ']') { 425 host[strlen(host) - 1] = '\0'; 426 return (host + 1); 427 } else 428 return host; 429 } 430 431 char * 432 colon(char *cp) 433 { 434 int flag = 0; 435 436 if (*cp == ':') /* Leading colon is part of file name. */ 437 return NULL; 438 if (*cp == '[') 439 flag = 1; 440 441 for (; *cp; ++cp) { 442 if (*cp == '@' && *(cp+1) == '[') 443 flag = 1; 444 if (*cp == ']' && *(cp+1) == ':' && flag) 445 return (cp+1); 446 if (*cp == ':' && !flag) 447 return (cp); 448 if (*cp == '/') 449 return NULL; 450 } 451 return NULL; 452 } 453 454 /* 455 * Parse a [user@]host[:port] string. 456 * Caller must free returned user and host. 457 * Any of the pointer return arguments may be NULL (useful for syntax checking). 458 * If user was not specified then *userp will be set to NULL. 459 * If port was not specified then *portp will be -1. 460 * Returns 0 on success, -1 on failure. 461 */ 462 int 463 parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) 464 { 465 char *sdup, *cp, *tmp; 466 char *user = NULL, *host = NULL; 467 int port = -1, ret = -1; 468 469 if (userp != NULL) 470 *userp = NULL; 471 if (hostp != NULL) 472 *hostp = NULL; 473 if (portp != NULL) 474 *portp = -1; 475 476 if ((sdup = tmp = strdup(s)) == NULL) 477 return -1; 478 /* Extract optional username */ 479 if ((cp = strchr(tmp, '@')) != NULL) { 480 *cp = '\0'; 481 if (*tmp == '\0') 482 goto out; 483 if ((user = strdup(tmp)) == NULL) 484 goto out; 485 tmp = cp + 1; 486 } 487 /* Extract mandatory hostname */ 488 if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') 489 goto out; 490 host = xstrdup(cleanhostname(cp)); 491 /* Convert and verify optional port */ 492 if (tmp != NULL && *tmp != '\0') { 493 if ((port = a2port(tmp)) <= 0) 494 goto out; 495 } 496 /* Success */ 497 if (userp != NULL) { 498 *userp = user; 499 user = NULL; 500 } 501 if (hostp != NULL) { 502 *hostp = host; 503 host = NULL; 504 } 505 if (portp != NULL) 506 *portp = port; 507 ret = 0; 508 out: 509 free(sdup); 510 free(user); 511 free(host); 512 return ret; 513 } 514 515 /* function to assist building execv() arguments */ 516 void 517 addargs(arglist *args, char *fmt, ...) 518 { 519 va_list ap; 520 char *cp; 521 u_int nalloc; 522 int r; 523 524 va_start(ap, fmt); 525 r = vasprintf(&cp, fmt, ap); 526 va_end(ap); 527 if (r == -1) 528 fatal("addargs: argument too long"); 529 530 nalloc = args->nalloc; 531 if (args->list == NULL) { 532 nalloc = 32; 533 args->num = 0; 534 } else if (args->num+2 >= nalloc) 535 nalloc *= 2; 536 537 args->list = xreallocarray(args->list, nalloc, sizeof(char *)); 538 args->nalloc = nalloc; 539 args->list[args->num++] = cp; 540 args->list[args->num] = NULL; 541 } 542 543 void 544 replacearg(arglist *args, u_int which, char *fmt, ...) 545 { 546 va_list ap; 547 char *cp; 548 int r; 549 550 va_start(ap, fmt); 551 r = vasprintf(&cp, fmt, ap); 552 va_end(ap); 553 if (r == -1) 554 fatal("replacearg: argument too long"); 555 556 if (which >= args->num) 557 fatal("replacearg: tried to replace invalid arg %d >= %d", 558 which, args->num); 559 free(args->list[which]); 560 args->list[which] = cp; 561 } 562 563 void 564 freeargs(arglist *args) 565 { 566 u_int i; 567 568 if (args->list != NULL) { 569 for (i = 0; i < args->num; i++) 570 free(args->list[i]); 571 free(args->list); 572 args->nalloc = args->num = 0; 573 args->list = NULL; 574 } 575 } 576 577 /* 578 * Expands tildes in the file name. Returns data allocated by xmalloc. 579 * Warning: this calls getpw*. 580 */ 581 char * 582 tilde_expand_filename(const char *filename, uid_t uid) 583 { 584 const char *path, *sep; 585 char user[128], *ret; 586 struct passwd *pw; 587 u_int len, slash; 588 589 if (*filename != '~') 590 return (xstrdup(filename)); 591 filename++; 592 593 path = strchr(filename, '/'); 594 if (path != NULL && path > filename) { /* ~user/path */ 595 slash = path - filename; 596 if (slash > sizeof(user) - 1) 597 fatal("tilde_expand_filename: ~username too long"); 598 memcpy(user, filename, slash); 599 user[slash] = '\0'; 600 if ((pw = getpwnam(user)) == NULL) 601 fatal("tilde_expand_filename: No such user %s", user); 602 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 603 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 604 605 /* Make sure directory has a trailing '/' */ 606 len = strlen(pw->pw_dir); 607 if (len == 0 || pw->pw_dir[len - 1] != '/') 608 sep = "/"; 609 else 610 sep = ""; 611 612 /* Skip leading '/' from specified path */ 613 if (path != NULL) 614 filename = path + 1; 615 616 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) 617 fatal("tilde_expand_filename: Path too long"); 618 619 return (ret); 620 } 621 622 /* 623 * Expand a string with a set of %[char] escapes. A number of escapes may be 624 * specified as (char *escape_chars, char *replacement) pairs. The list must 625 * be terminated by a NULL escape_char. Returns replaced string in memory 626 * allocated by xmalloc. 627 */ 628 char * 629 percent_expand(const char *string, ...) 630 { 631 #define EXPAND_MAX_KEYS 16 632 u_int num_keys, i, j; 633 struct { 634 const char *key; 635 const char *repl; 636 } keys[EXPAND_MAX_KEYS]; 637 char buf[4096]; 638 va_list ap; 639 640 /* Gather keys */ 641 va_start(ap, string); 642 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 643 keys[num_keys].key = va_arg(ap, char *); 644 if (keys[num_keys].key == NULL) 645 break; 646 keys[num_keys].repl = va_arg(ap, char *); 647 if (keys[num_keys].repl == NULL) 648 fatal("%s: NULL replacement", __func__); 649 } 650 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 651 fatal("%s: too many keys", __func__); 652 va_end(ap); 653 654 /* Expand string */ 655 *buf = '\0'; 656 for (i = 0; *string != '\0'; string++) { 657 if (*string != '%') { 658 append: 659 buf[i++] = *string; 660 if (i >= sizeof(buf)) 661 fatal("%s: string too long", __func__); 662 buf[i] = '\0'; 663 continue; 664 } 665 string++; 666 /* %% case */ 667 if (*string == '%') 668 goto append; 669 if (*string == '\0') 670 fatal("%s: invalid format", __func__); 671 for (j = 0; j < num_keys; j++) { 672 if (strchr(keys[j].key, *string) != NULL) { 673 i = strlcat(buf, keys[j].repl, sizeof(buf)); 674 if (i >= sizeof(buf)) 675 fatal("%s: string too long", __func__); 676 break; 677 } 678 } 679 if (j >= num_keys) 680 fatal("%s: unknown key %%%c", __func__, *string); 681 } 682 return (xstrdup(buf)); 683 #undef EXPAND_MAX_KEYS 684 } 685 686 /* 687 * Read an entire line from a public key file into a static buffer, discarding 688 * lines that exceed the buffer size. Returns 0 on success, -1 on failure. 689 */ 690 int 691 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 692 u_long *lineno) 693 { 694 while (fgets(buf, bufsz, f) != NULL) { 695 if (buf[0] == '\0') 696 continue; 697 (*lineno)++; 698 if (buf[strlen(buf) - 1] == '\n' || feof(f)) { 699 return 0; 700 } else { 701 debug("%s: %s line %lu exceeds size limit", __func__, 702 filename, *lineno); 703 /* discard remainder of line */ 704 while (fgetc(f) != '\n' && !feof(f)) 705 ; /* nothing */ 706 } 707 } 708 return -1; 709 } 710 711 int 712 tun_open(int tun, int mode) 713 { 714 #if defined(CUSTOM_SYS_TUN_OPEN) 715 return (sys_tun_open(tun, mode)); 716 #elif defined(SSH_TUN_OPENBSD) 717 struct ifreq ifr; 718 char name[100]; 719 int fd = -1, sock; 720 const char *tunbase = "tun"; 721 722 if (mode == SSH_TUNMODE_ETHERNET) 723 tunbase = "tap"; 724 725 /* Open the tunnel device */ 726 if (tun <= SSH_TUNID_MAX) { 727 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); 728 fd = open(name, O_RDWR); 729 } else if (tun == SSH_TUNID_ANY) { 730 for (tun = 100; tun >= 0; tun--) { 731 snprintf(name, sizeof(name), "/dev/%s%d", 732 tunbase, tun); 733 if ((fd = open(name, O_RDWR)) >= 0) 734 break; 735 } 736 } else { 737 debug("%s: invalid tunnel %u", __func__, tun); 738 return -1; 739 } 740 741 if (fd < 0) { 742 debug("%s: %s open: %s", __func__, name, strerror(errno)); 743 return -1; 744 } 745 746 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 747 748 /* Bring interface up if it is not already */ 749 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); 750 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 751 goto failed; 752 753 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { 754 debug("%s: get interface %s flags: %s", __func__, 755 ifr.ifr_name, strerror(errno)); 756 goto failed; 757 } 758 759 if (!(ifr.ifr_flags & IFF_UP)) { 760 ifr.ifr_flags |= IFF_UP; 761 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { 762 debug("%s: activate interface %s: %s", __func__, 763 ifr.ifr_name, strerror(errno)); 764 goto failed; 765 } 766 } 767 768 close(sock); 769 return fd; 770 771 failed: 772 if (fd >= 0) 773 close(fd); 774 if (sock >= 0) 775 close(sock); 776 return -1; 777 #else 778 error("Tunnel interfaces are not supported on this platform"); 779 return (-1); 780 #endif 781 } 782 783 void 784 sanitise_stdfd(void) 785 { 786 int nullfd, dupfd; 787 788 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 789 fprintf(stderr, "Couldn't open /dev/null: %s\n", 790 strerror(errno)); 791 exit(1); 792 } 793 while (++dupfd <= STDERR_FILENO) { 794 /* Only populate closed fds. */ 795 if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { 796 if (dup2(nullfd, dupfd) == -1) { 797 fprintf(stderr, "dup2: %s\n", strerror(errno)); 798 exit(1); 799 } 800 } 801 } 802 if (nullfd > STDERR_FILENO) 803 close(nullfd); 804 } 805 806 char * 807 tohex(const void *vp, size_t l) 808 { 809 const u_char *p = (const u_char *)vp; 810 char b[3], *r; 811 size_t i, hl; 812 813 if (l > 65536) 814 return xstrdup("tohex: length > 65536"); 815 816 hl = l * 2 + 1; 817 r = xcalloc(1, hl); 818 for (i = 0; i < l; i++) { 819 snprintf(b, sizeof(b), "%02x", p[i]); 820 strlcat(r, b, hl); 821 } 822 return (r); 823 } 824 825 u_int64_t 826 get_u64(const void *vp) 827 { 828 const u_char *p = (const u_char *)vp; 829 u_int64_t v; 830 831 v = (u_int64_t)p[0] << 56; 832 v |= (u_int64_t)p[1] << 48; 833 v |= (u_int64_t)p[2] << 40; 834 v |= (u_int64_t)p[3] << 32; 835 v |= (u_int64_t)p[4] << 24; 836 v |= (u_int64_t)p[5] << 16; 837 v |= (u_int64_t)p[6] << 8; 838 v |= (u_int64_t)p[7]; 839 840 return (v); 841 } 842 843 u_int32_t 844 get_u32(const void *vp) 845 { 846 const u_char *p = (const u_char *)vp; 847 u_int32_t v; 848 849 v = (u_int32_t)p[0] << 24; 850 v |= (u_int32_t)p[1] << 16; 851 v |= (u_int32_t)p[2] << 8; 852 v |= (u_int32_t)p[3]; 853 854 return (v); 855 } 856 857 u_int32_t 858 get_u32_le(const void *vp) 859 { 860 const u_char *p = (const u_char *)vp; 861 u_int32_t v; 862 863 v = (u_int32_t)p[0]; 864 v |= (u_int32_t)p[1] << 8; 865 v |= (u_int32_t)p[2] << 16; 866 v |= (u_int32_t)p[3] << 24; 867 868 return (v); 869 } 870 871 u_int16_t 872 get_u16(const void *vp) 873 { 874 const u_char *p = (const u_char *)vp; 875 u_int16_t v; 876 877 v = (u_int16_t)p[0] << 8; 878 v |= (u_int16_t)p[1]; 879 880 return (v); 881 } 882 883 void 884 put_u64(void *vp, u_int64_t v) 885 { 886 u_char *p = (u_char *)vp; 887 888 p[0] = (u_char)(v >> 56) & 0xff; 889 p[1] = (u_char)(v >> 48) & 0xff; 890 p[2] = (u_char)(v >> 40) & 0xff; 891 p[3] = (u_char)(v >> 32) & 0xff; 892 p[4] = (u_char)(v >> 24) & 0xff; 893 p[5] = (u_char)(v >> 16) & 0xff; 894 p[6] = (u_char)(v >> 8) & 0xff; 895 p[7] = (u_char)v & 0xff; 896 } 897 898 void 899 put_u32(void *vp, u_int32_t v) 900 { 901 u_char *p = (u_char *)vp; 902 903 p[0] = (u_char)(v >> 24) & 0xff; 904 p[1] = (u_char)(v >> 16) & 0xff; 905 p[2] = (u_char)(v >> 8) & 0xff; 906 p[3] = (u_char)v & 0xff; 907 } 908 909 void 910 put_u32_le(void *vp, u_int32_t v) 911 { 912 u_char *p = (u_char *)vp; 913 914 p[0] = (u_char)v & 0xff; 915 p[1] = (u_char)(v >> 8) & 0xff; 916 p[2] = (u_char)(v >> 16) & 0xff; 917 p[3] = (u_char)(v >> 24) & 0xff; 918 } 919 920 void 921 put_u16(void *vp, u_int16_t v) 922 { 923 u_char *p = (u_char *)vp; 924 925 p[0] = (u_char)(v >> 8) & 0xff; 926 p[1] = (u_char)v & 0xff; 927 } 928 929 void 930 ms_subtract_diff(struct timeval *start, int *ms) 931 { 932 struct timeval diff, finish; 933 934 gettimeofday(&finish, NULL); 935 timersub(&finish, start, &diff); 936 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 937 } 938 939 void 940 ms_to_timeval(struct timeval *tv, int ms) 941 { 942 if (ms < 0) 943 ms = 0; 944 tv->tv_sec = ms / 1000; 945 tv->tv_usec = (ms % 1000) * 1000; 946 } 947 948 time_t 949 monotime(void) 950 { 951 #if defined(HAVE_CLOCK_GETTIME) && \ 952 (defined(CLOCK_MONOTONIC) || defined(CLOCK_BOOTTIME)) 953 struct timespec ts; 954 static int gettime_failed = 0; 955 956 if (!gettime_failed) { 957 #if defined(CLOCK_BOOTTIME) 958 if (clock_gettime(CLOCK_BOOTTIME, &ts) == 0) 959 return (ts.tv_sec); 960 #endif 961 #if defined(CLOCK_MONOTONIC) 962 if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) 963 return (ts.tv_sec); 964 #endif 965 debug3("clock_gettime: %s", strerror(errno)); 966 gettime_failed = 1; 967 } 968 #endif /* HAVE_CLOCK_GETTIME && (CLOCK_MONOTONIC || CLOCK_BOOTTIME */ 969 970 return time(NULL); 971 } 972 973 double 974 monotime_double(void) 975 { 976 #if defined(HAVE_CLOCK_GETTIME) && \ 977 (defined(CLOCK_MONOTONIC) || defined(CLOCK_BOOTTIME)) 978 struct timespec ts; 979 static int gettime_failed = 0; 980 981 if (!gettime_failed) { 982 #if defined(CLOCK_BOOTTIME) 983 if (clock_gettime(CLOCK_BOOTTIME, &ts) == 0) 984 return (ts.tv_sec + (double)ts.tv_nsec / 1000000000); 985 #endif 986 #if defined(CLOCK_MONOTONIC) 987 if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) 988 return (ts.tv_sec + (double)ts.tv_nsec / 1000000000); 989 #endif 990 debug3("clock_gettime: %s", strerror(errno)); 991 gettime_failed = 1; 992 } 993 #endif /* HAVE_CLOCK_GETTIME && (CLOCK_MONOTONIC || CLOCK_BOOTTIME */ 994 995 return (double)time(NULL); 996 } 997 998 void 999 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 1000 { 1001 bw->buflen = buflen; 1002 bw->rate = kbps; 1003 bw->thresh = bw->rate; 1004 bw->lamt = 0; 1005 timerclear(&bw->bwstart); 1006 timerclear(&bw->bwend); 1007 } 1008 1009 /* Callback from read/write loop to insert bandwidth-limiting delays */ 1010 void 1011 bandwidth_limit(struct bwlimit *bw, size_t read_len) 1012 { 1013 u_int64_t waitlen; 1014 struct timespec ts, rm; 1015 1016 if (!timerisset(&bw->bwstart)) { 1017 gettimeofday(&bw->bwstart, NULL); 1018 return; 1019 } 1020 1021 bw->lamt += read_len; 1022 if (bw->lamt < bw->thresh) 1023 return; 1024 1025 gettimeofday(&bw->bwend, NULL); 1026 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 1027 if (!timerisset(&bw->bwend)) 1028 return; 1029 1030 bw->lamt *= 8; 1031 waitlen = (double)1000000L * bw->lamt / bw->rate; 1032 1033 bw->bwstart.tv_sec = waitlen / 1000000L; 1034 bw->bwstart.tv_usec = waitlen % 1000000L; 1035 1036 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 1037 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 1038 1039 /* Adjust the wait time */ 1040 if (bw->bwend.tv_sec) { 1041 bw->thresh /= 2; 1042 if (bw->thresh < bw->buflen / 4) 1043 bw->thresh = bw->buflen / 4; 1044 } else if (bw->bwend.tv_usec < 10000) { 1045 bw->thresh *= 2; 1046 if (bw->thresh > bw->buflen * 8) 1047 bw->thresh = bw->buflen * 8; 1048 } 1049 1050 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 1051 while (nanosleep(&ts, &rm) == -1) { 1052 if (errno != EINTR) 1053 break; 1054 ts = rm; 1055 } 1056 } 1057 1058 bw->lamt = 0; 1059 gettimeofday(&bw->bwstart, NULL); 1060 } 1061 1062 /* Make a template filename for mk[sd]temp() */ 1063 void 1064 mktemp_proto(char *s, size_t len) 1065 { 1066 const char *tmpdir; 1067 int r; 1068 1069 if ((tmpdir = getenv("TMPDIR")) != NULL) { 1070 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 1071 if (r > 0 && (size_t)r < len) 1072 return; 1073 } 1074 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 1075 if (r < 0 || (size_t)r >= len) 1076 fatal("%s: template string too short", __func__); 1077 } 1078 1079 static const struct { 1080 const char *name; 1081 int value; 1082 } ipqos[] = { 1083 { "af11", IPTOS_DSCP_AF11 }, 1084 { "af12", IPTOS_DSCP_AF12 }, 1085 { "af13", IPTOS_DSCP_AF13 }, 1086 { "af21", IPTOS_DSCP_AF21 }, 1087 { "af22", IPTOS_DSCP_AF22 }, 1088 { "af23", IPTOS_DSCP_AF23 }, 1089 { "af31", IPTOS_DSCP_AF31 }, 1090 { "af32", IPTOS_DSCP_AF32 }, 1091 { "af33", IPTOS_DSCP_AF33 }, 1092 { "af41", IPTOS_DSCP_AF41 }, 1093 { "af42", IPTOS_DSCP_AF42 }, 1094 { "af43", IPTOS_DSCP_AF43 }, 1095 { "cs0", IPTOS_DSCP_CS0 }, 1096 { "cs1", IPTOS_DSCP_CS1 }, 1097 { "cs2", IPTOS_DSCP_CS2 }, 1098 { "cs3", IPTOS_DSCP_CS3 }, 1099 { "cs4", IPTOS_DSCP_CS4 }, 1100 { "cs5", IPTOS_DSCP_CS5 }, 1101 { "cs6", IPTOS_DSCP_CS6 }, 1102 { "cs7", IPTOS_DSCP_CS7 }, 1103 { "ef", IPTOS_DSCP_EF }, 1104 { "lowdelay", IPTOS_LOWDELAY }, 1105 { "throughput", IPTOS_THROUGHPUT }, 1106 { "reliability", IPTOS_RELIABILITY }, 1107 { NULL, -1 } 1108 }; 1109 1110 int 1111 parse_ipqos(const char *cp) 1112 { 1113 u_int i; 1114 char *ep; 1115 long val; 1116 1117 if (cp == NULL) 1118 return -1; 1119 for (i = 0; ipqos[i].name != NULL; i++) { 1120 if (strcasecmp(cp, ipqos[i].name) == 0) 1121 return ipqos[i].value; 1122 } 1123 /* Try parsing as an integer */ 1124 val = strtol(cp, &ep, 0); 1125 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1126 return -1; 1127 return val; 1128 } 1129 1130 const char * 1131 iptos2str(int iptos) 1132 { 1133 int i; 1134 static char iptos_str[sizeof "0xff"]; 1135 1136 for (i = 0; ipqos[i].name != NULL; i++) { 1137 if (ipqos[i].value == iptos) 1138 return ipqos[i].name; 1139 } 1140 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1141 return iptos_str; 1142 } 1143 1144 void 1145 lowercase(char *s) 1146 { 1147 for (; *s; s++) 1148 *s = tolower((u_char)*s); 1149 } 1150 1151 int 1152 unix_listener(const char *path, int backlog, int unlink_first) 1153 { 1154 struct sockaddr_un sunaddr; 1155 int saved_errno, sock; 1156 1157 memset(&sunaddr, 0, sizeof(sunaddr)); 1158 sunaddr.sun_family = AF_UNIX; 1159 if (strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { 1160 error("%s: \"%s\" too long for Unix domain socket", __func__, 1161 path); 1162 errno = ENAMETOOLONG; 1163 return -1; 1164 } 1165 1166 sock = socket(PF_UNIX, SOCK_STREAM, 0); 1167 if (sock < 0) { 1168 saved_errno = errno; 1169 error("socket: %.100s", strerror(errno)); 1170 errno = saved_errno; 1171 return -1; 1172 } 1173 if (unlink_first == 1) { 1174 if (unlink(path) != 0 && errno != ENOENT) 1175 error("unlink(%s): %.100s", path, strerror(errno)); 1176 } 1177 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) { 1178 saved_errno = errno; 1179 error("bind: %.100s", strerror(errno)); 1180 close(sock); 1181 error("%s: cannot bind to path: %s", __func__, path); 1182 errno = saved_errno; 1183 return -1; 1184 } 1185 if (listen(sock, backlog) < 0) { 1186 saved_errno = errno; 1187 error("listen: %.100s", strerror(errno)); 1188 close(sock); 1189 unlink(path); 1190 error("%s: cannot listen on path: %s", __func__, path); 1191 errno = saved_errno; 1192 return -1; 1193 } 1194 return sock; 1195 } 1196 1197 void 1198 sock_set_v6only(int s) 1199 { 1200 #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) 1201 int on = 1; 1202 1203 debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); 1204 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) 1205 error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); 1206 #endif 1207 } 1208 1209 /* 1210 * Compares two strings that maybe be NULL. Returns non-zero if strings 1211 * are both NULL or are identical, returns zero otherwise. 1212 */ 1213 static int 1214 strcmp_maybe_null(const char *a, const char *b) 1215 { 1216 if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) 1217 return 0; 1218 if (a != NULL && strcmp(a, b) != 0) 1219 return 0; 1220 return 1; 1221 } 1222 1223 /* 1224 * Compare two forwards, returning non-zero if they are identical or 1225 * zero otherwise. 1226 */ 1227 int 1228 forward_equals(const struct Forward *a, const struct Forward *b) 1229 { 1230 if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) 1231 return 0; 1232 if (a->listen_port != b->listen_port) 1233 return 0; 1234 if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) 1235 return 0; 1236 if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) 1237 return 0; 1238 if (a->connect_port != b->connect_port) 1239 return 0; 1240 if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) 1241 return 0; 1242 /* allocated_port and handle are not checked */ 1243 return 1; 1244 } 1245 1246