1 /* $OpenBSD: misc.c,v 1.104 2016/04/06 06:42:17 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 <sys/types.h> 28 #include <sys/ioctl.h> 29 #include <sys/socket.h> 30 #include <sys/time.h> 31 #include <sys/un.h> 32 33 #include <net/if.h> 34 #include <netinet/in.h> 35 #include <netinet/ip.h> 36 #include <netinet/tcp.h> 37 38 #include <ctype.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <netdb.h> 42 #include <paths.h> 43 #include <pwd.h> 44 #include <limits.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 56 /* remove newline at end of string */ 57 char * 58 chop(char *s) 59 { 60 char *t = s; 61 while (*t) { 62 if (*t == '\n' || *t == '\r') { 63 *t = '\0'; 64 return s; 65 } 66 t++; 67 } 68 return s; 69 70 } 71 72 /* set/unset filedescriptor to non-blocking */ 73 int 74 set_nonblock(int fd) 75 { 76 int val; 77 78 val = fcntl(fd, F_GETFL); 79 if (val < 0) { 80 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 81 return (-1); 82 } 83 if (val & O_NONBLOCK) { 84 debug3("fd %d is O_NONBLOCK", fd); 85 return (0); 86 } 87 debug2("fd %d setting O_NONBLOCK", fd); 88 val |= O_NONBLOCK; 89 if (fcntl(fd, F_SETFL, val) == -1) { 90 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 91 strerror(errno)); 92 return (-1); 93 } 94 return (0); 95 } 96 97 int 98 unset_nonblock(int fd) 99 { 100 int val; 101 102 val = fcntl(fd, F_GETFL); 103 if (val < 0) { 104 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 105 return (-1); 106 } 107 if (!(val & O_NONBLOCK)) { 108 debug3("fd %d is not O_NONBLOCK", fd); 109 return (0); 110 } 111 debug("fd %d clearing O_NONBLOCK", fd); 112 val &= ~O_NONBLOCK; 113 if (fcntl(fd, F_SETFL, val) == -1) { 114 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 115 fd, strerror(errno)); 116 return (-1); 117 } 118 return (0); 119 } 120 121 const char * 122 ssh_gai_strerror(int gaierr) 123 { 124 if (gaierr == EAI_SYSTEM && errno != 0) 125 return strerror(errno); 126 return gai_strerror(gaierr); 127 } 128 129 /* disable nagle on socket */ 130 void 131 set_nodelay(int fd) 132 { 133 int opt; 134 socklen_t optlen; 135 136 optlen = sizeof opt; 137 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 138 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 139 return; 140 } 141 if (opt == 1) { 142 debug2("fd %d is TCP_NODELAY", fd); 143 return; 144 } 145 opt = 1; 146 debug2("fd %d setting TCP_NODELAY", fd); 147 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 148 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 149 } 150 151 /* Characters considered whitespace in strsep calls. */ 152 #define WHITESPACE " \t\r\n" 153 #define QUOTE "\"" 154 155 /* return next token in configuration line */ 156 char * 157 strdelim(char **s) 158 { 159 char *old; 160 int wspace = 0; 161 162 if (*s == NULL) 163 return NULL; 164 165 old = *s; 166 167 *s = strpbrk(*s, WHITESPACE QUOTE "="); 168 if (*s == NULL) 169 return (old); 170 171 if (*s[0] == '\"') { 172 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 173 /* Find matching quote */ 174 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 175 return (NULL); /* no matching quote */ 176 } else { 177 *s[0] = '\0'; 178 *s += strspn(*s + 1, WHITESPACE) + 1; 179 return (old); 180 } 181 } 182 183 /* Allow only one '=' to be skipped */ 184 if (*s[0] == '=') 185 wspace = 1; 186 *s[0] = '\0'; 187 188 /* Skip any extra whitespace after first token */ 189 *s += strspn(*s + 1, WHITESPACE) + 1; 190 if (*s[0] == '=' && !wspace) 191 *s += strspn(*s + 1, WHITESPACE) + 1; 192 193 return (old); 194 } 195 196 struct passwd * 197 pwcopy(struct passwd *pw) 198 { 199 struct passwd *copy = xcalloc(1, sizeof(*copy)); 200 201 copy->pw_name = xstrdup(pw->pw_name); 202 copy->pw_passwd = xstrdup(pw->pw_passwd); 203 copy->pw_gecos = xstrdup(pw->pw_gecos); 204 copy->pw_uid = pw->pw_uid; 205 copy->pw_gid = pw->pw_gid; 206 copy->pw_expire = pw->pw_expire; 207 copy->pw_change = pw->pw_change; 208 copy->pw_class = xstrdup(pw->pw_class); 209 copy->pw_dir = xstrdup(pw->pw_dir); 210 copy->pw_shell = xstrdup(pw->pw_shell); 211 return copy; 212 } 213 214 /* 215 * Convert ASCII string to TCP/IP port number. 216 * Port must be >=0 and <=65535. 217 * Return -1 if invalid. 218 */ 219 int 220 a2port(const char *s) 221 { 222 long long port; 223 const char *errstr; 224 225 port = strtonum(s, 0, 65535, &errstr); 226 if (errstr != NULL) 227 return -1; 228 return (int)port; 229 } 230 231 int 232 a2tun(const char *s, int *remote) 233 { 234 const char *errstr = NULL; 235 char *sp, *ep; 236 int tun; 237 238 if (remote != NULL) { 239 *remote = SSH_TUNID_ANY; 240 sp = xstrdup(s); 241 if ((ep = strchr(sp, ':')) == NULL) { 242 free(sp); 243 return (a2tun(s, NULL)); 244 } 245 ep[0] = '\0'; ep++; 246 *remote = a2tun(ep, NULL); 247 tun = a2tun(sp, NULL); 248 free(sp); 249 return (*remote == SSH_TUNID_ERR ? *remote : tun); 250 } 251 252 if (strcasecmp(s, "any") == 0) 253 return (SSH_TUNID_ANY); 254 255 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 256 if (errstr != NULL) 257 return (SSH_TUNID_ERR); 258 259 return (tun); 260 } 261 262 #define SECONDS 1 263 #define MINUTES (SECONDS * 60) 264 #define HOURS (MINUTES * 60) 265 #define DAYS (HOURS * 24) 266 #define WEEKS (DAYS * 7) 267 268 /* 269 * Convert a time string into seconds; format is 270 * a sequence of: 271 * time[qualifier] 272 * 273 * Valid time qualifiers are: 274 * <none> seconds 275 * s|S seconds 276 * m|M minutes 277 * h|H hours 278 * d|D days 279 * w|W weeks 280 * 281 * Examples: 282 * 90m 90 minutes 283 * 1h30m 90 minutes 284 * 2d 2 days 285 * 1w 1 week 286 * 287 * Return -1 if time string is invalid. 288 */ 289 long 290 convtime(const char *s) 291 { 292 long total, secs; 293 const char *p; 294 char *endp; 295 296 errno = 0; 297 total = 0; 298 p = s; 299 300 if (p == NULL || *p == '\0') 301 return -1; 302 303 while (*p) { 304 secs = strtol(p, &endp, 10); 305 if (p == endp || 306 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || 307 secs < 0) 308 return -1; 309 310 switch (*endp++) { 311 case '\0': 312 endp--; 313 break; 314 case 's': 315 case 'S': 316 break; 317 case 'm': 318 case 'M': 319 secs *= MINUTES; 320 break; 321 case 'h': 322 case 'H': 323 secs *= HOURS; 324 break; 325 case 'd': 326 case 'D': 327 secs *= DAYS; 328 break; 329 case 'w': 330 case 'W': 331 secs *= WEEKS; 332 break; 333 default: 334 return -1; 335 } 336 total += secs; 337 if (total < 0) 338 return -1; 339 p = endp; 340 } 341 342 return total; 343 } 344 345 /* 346 * Returns a standardized host+port identifier string. 347 * Caller must free returned string. 348 */ 349 char * 350 put_host_port(const char *host, u_short port) 351 { 352 char *hoststr; 353 354 if (port == 0 || port == SSH_DEFAULT_PORT) 355 return(xstrdup(host)); 356 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) 357 fatal("put_host_port: asprintf: %s", strerror(errno)); 358 debug3("put_host_port: %s", hoststr); 359 return hoststr; 360 } 361 362 /* 363 * Search for next delimiter between hostnames/addresses and ports. 364 * Argument may be modified (for termination). 365 * Returns *cp if parsing succeeds. 366 * *cp is set to the start of the next delimiter, if one was found. 367 * If this is the last field, *cp is set to NULL. 368 */ 369 char * 370 hpdelim(char **cp) 371 { 372 char *s, *old; 373 374 if (cp == NULL || *cp == NULL) 375 return NULL; 376 377 old = s = *cp; 378 if (*s == '[') { 379 if ((s = strchr(s, ']')) == NULL) 380 return NULL; 381 else 382 s++; 383 } else if ((s = strpbrk(s, ":/")) == NULL) 384 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 385 386 switch (*s) { 387 case '\0': 388 *cp = NULL; /* no more fields*/ 389 break; 390 391 case ':': 392 case '/': 393 *s = '\0'; /* terminate */ 394 *cp = s + 1; 395 break; 396 397 default: 398 return NULL; 399 } 400 401 return old; 402 } 403 404 char * 405 cleanhostname(char *host) 406 { 407 if (*host == '[' && host[strlen(host) - 1] == ']') { 408 host[strlen(host) - 1] = '\0'; 409 return (host + 1); 410 } else 411 return host; 412 } 413 414 char * 415 colon(char *cp) 416 { 417 int flag = 0; 418 419 if (*cp == ':') /* Leading colon is part of file name. */ 420 return NULL; 421 if (*cp == '[') 422 flag = 1; 423 424 for (; *cp; ++cp) { 425 if (*cp == '@' && *(cp+1) == '[') 426 flag = 1; 427 if (*cp == ']' && *(cp+1) == ':' && flag) 428 return (cp+1); 429 if (*cp == ':' && !flag) 430 return (cp); 431 if (*cp == '/') 432 return NULL; 433 } 434 return NULL; 435 } 436 437 /* function to assist building execv() arguments */ 438 void 439 addargs(arglist *args, char *fmt, ...) 440 { 441 va_list ap; 442 char *cp; 443 u_int nalloc; 444 int r; 445 446 va_start(ap, fmt); 447 r = vasprintf(&cp, fmt, ap); 448 va_end(ap); 449 if (r == -1) 450 fatal("addargs: argument too long"); 451 452 nalloc = args->nalloc; 453 if (args->list == NULL) { 454 nalloc = 32; 455 args->num = 0; 456 } else if (args->num+2 >= nalloc) 457 nalloc *= 2; 458 459 args->list = xreallocarray(args->list, nalloc, sizeof(char *)); 460 args->nalloc = nalloc; 461 args->list[args->num++] = cp; 462 args->list[args->num] = NULL; 463 } 464 465 void 466 replacearg(arglist *args, u_int which, char *fmt, ...) 467 { 468 va_list ap; 469 char *cp; 470 int r; 471 472 va_start(ap, fmt); 473 r = vasprintf(&cp, fmt, ap); 474 va_end(ap); 475 if (r == -1) 476 fatal("replacearg: argument too long"); 477 478 if (which >= args->num) 479 fatal("replacearg: tried to replace invalid arg %d >= %d", 480 which, args->num); 481 free(args->list[which]); 482 args->list[which] = cp; 483 } 484 485 void 486 freeargs(arglist *args) 487 { 488 u_int i; 489 490 if (args->list != NULL) { 491 for (i = 0; i < args->num; i++) 492 free(args->list[i]); 493 free(args->list); 494 args->nalloc = args->num = 0; 495 args->list = NULL; 496 } 497 } 498 499 /* 500 * Expands tildes in the file name. Returns data allocated by xmalloc. 501 * Warning: this calls getpw*. 502 */ 503 char * 504 tilde_expand_filename(const char *filename, uid_t uid) 505 { 506 const char *path, *sep; 507 char user[128], *ret; 508 struct passwd *pw; 509 u_int len, slash; 510 511 if (*filename != '~') 512 return (xstrdup(filename)); 513 filename++; 514 515 path = strchr(filename, '/'); 516 if (path != NULL && path > filename) { /* ~user/path */ 517 slash = path - filename; 518 if (slash > sizeof(user) - 1) 519 fatal("tilde_expand_filename: ~username too long"); 520 memcpy(user, filename, slash); 521 user[slash] = '\0'; 522 if ((pw = getpwnam(user)) == NULL) 523 fatal("tilde_expand_filename: No such user %s", user); 524 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 525 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 526 527 /* Make sure directory has a trailing '/' */ 528 len = strlen(pw->pw_dir); 529 if (len == 0 || pw->pw_dir[len - 1] != '/') 530 sep = "/"; 531 else 532 sep = ""; 533 534 /* Skip leading '/' from specified path */ 535 if (path != NULL) 536 filename = path + 1; 537 538 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) 539 fatal("tilde_expand_filename: Path too long"); 540 541 return (ret); 542 } 543 544 /* 545 * Expand a string with a set of %[char] escapes. A number of escapes may be 546 * specified as (char *escape_chars, char *replacement) pairs. The list must 547 * be terminated by a NULL escape_char. Returns replaced string in memory 548 * allocated by xmalloc. 549 */ 550 char * 551 percent_expand(const char *string, ...) 552 { 553 #define EXPAND_MAX_KEYS 16 554 u_int num_keys, i, j; 555 struct { 556 const char *key; 557 const char *repl; 558 } keys[EXPAND_MAX_KEYS]; 559 char buf[4096]; 560 va_list ap; 561 562 /* Gather keys */ 563 va_start(ap, string); 564 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 565 keys[num_keys].key = va_arg(ap, char *); 566 if (keys[num_keys].key == NULL) 567 break; 568 keys[num_keys].repl = va_arg(ap, char *); 569 if (keys[num_keys].repl == NULL) 570 fatal("%s: NULL replacement", __func__); 571 } 572 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 573 fatal("%s: too many keys", __func__); 574 va_end(ap); 575 576 /* Expand string */ 577 *buf = '\0'; 578 for (i = 0; *string != '\0'; string++) { 579 if (*string != '%') { 580 append: 581 buf[i++] = *string; 582 if (i >= sizeof(buf)) 583 fatal("%s: string too long", __func__); 584 buf[i] = '\0'; 585 continue; 586 } 587 string++; 588 /* %% case */ 589 if (*string == '%') 590 goto append; 591 if (*string == '\0') 592 fatal("%s: invalid format", __func__); 593 for (j = 0; j < num_keys; j++) { 594 if (strchr(keys[j].key, *string) != NULL) { 595 i = strlcat(buf, keys[j].repl, sizeof(buf)); 596 if (i >= sizeof(buf)) 597 fatal("%s: string too long", __func__); 598 break; 599 } 600 } 601 if (j >= num_keys) 602 fatal("%s: unknown key %%%c", __func__, *string); 603 } 604 return (xstrdup(buf)); 605 #undef EXPAND_MAX_KEYS 606 } 607 608 /* 609 * Read an entire line from a public key file into a static buffer, discarding 610 * lines that exceed the buffer size. Returns 0 on success, -1 on failure. 611 */ 612 int 613 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 614 u_long *lineno) 615 { 616 while (fgets(buf, bufsz, f) != NULL) { 617 if (buf[0] == '\0') 618 continue; 619 (*lineno)++; 620 if (buf[strlen(buf) - 1] == '\n' || feof(f)) { 621 return 0; 622 } else { 623 debug("%s: %s line %lu exceeds size limit", __func__, 624 filename, *lineno); 625 /* discard remainder of line */ 626 while (fgetc(f) != '\n' && !feof(f)) 627 ; /* nothing */ 628 } 629 } 630 return -1; 631 } 632 633 int 634 tun_open(int tun, int mode) 635 { 636 struct ifreq ifr; 637 char name[100]; 638 int fd = -1, sock; 639 const char *tunbase = "tun"; 640 641 if (mode == SSH_TUNMODE_ETHERNET) 642 tunbase = "tap"; 643 644 /* Open the tunnel device */ 645 if (tun <= SSH_TUNID_MAX) { 646 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); 647 fd = open(name, O_RDWR); 648 } else if (tun == SSH_TUNID_ANY) { 649 for (tun = 100; tun >= 0; tun--) { 650 snprintf(name, sizeof(name), "/dev/%s%d", 651 tunbase, tun); 652 if ((fd = open(name, O_RDWR)) >= 0) 653 break; 654 } 655 } else { 656 debug("%s: invalid tunnel %u", __func__, tun); 657 return -1; 658 } 659 660 if (fd < 0) { 661 debug("%s: %s open: %s", __func__, name, strerror(errno)); 662 return -1; 663 } 664 665 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 666 667 /* Bring interface up if it is not already */ 668 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); 669 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 670 goto failed; 671 672 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { 673 debug("%s: get interface %s flags: %s", __func__, 674 ifr.ifr_name, strerror(errno)); 675 goto failed; 676 } 677 678 if (!(ifr.ifr_flags & IFF_UP)) { 679 ifr.ifr_flags |= IFF_UP; 680 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { 681 debug("%s: activate interface %s: %s", __func__, 682 ifr.ifr_name, strerror(errno)); 683 goto failed; 684 } 685 } 686 687 close(sock); 688 return fd; 689 690 failed: 691 if (fd >= 0) 692 close(fd); 693 if (sock >= 0) 694 close(sock); 695 return -1; 696 } 697 698 void 699 sanitise_stdfd(void) 700 { 701 int nullfd, dupfd; 702 703 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 704 fprintf(stderr, "Couldn't open /dev/null: %s\n", 705 strerror(errno)); 706 exit(1); 707 } 708 while (++dupfd <= STDERR_FILENO) { 709 /* Only populate closed fds. */ 710 if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { 711 if (dup2(nullfd, dupfd) == -1) { 712 fprintf(stderr, "dup2: %s\n", strerror(errno)); 713 exit(1); 714 } 715 } 716 } 717 if (nullfd > STDERR_FILENO) 718 close(nullfd); 719 } 720 721 char * 722 tohex(const void *vp, size_t l) 723 { 724 const u_char *p = (const u_char *)vp; 725 char b[3], *r; 726 size_t i, hl; 727 728 if (l > 65536) 729 return xstrdup("tohex: length > 65536"); 730 731 hl = l * 2 + 1; 732 r = xcalloc(1, hl); 733 for (i = 0; i < l; i++) { 734 snprintf(b, sizeof(b), "%02x", p[i]); 735 strlcat(r, b, hl); 736 } 737 return (r); 738 } 739 740 u_int64_t 741 get_u64(const void *vp) 742 { 743 const u_char *p = (const u_char *)vp; 744 u_int64_t v; 745 746 v = (u_int64_t)p[0] << 56; 747 v |= (u_int64_t)p[1] << 48; 748 v |= (u_int64_t)p[2] << 40; 749 v |= (u_int64_t)p[3] << 32; 750 v |= (u_int64_t)p[4] << 24; 751 v |= (u_int64_t)p[5] << 16; 752 v |= (u_int64_t)p[6] << 8; 753 v |= (u_int64_t)p[7]; 754 755 return (v); 756 } 757 758 u_int32_t 759 get_u32(const void *vp) 760 { 761 const u_char *p = (const u_char *)vp; 762 u_int32_t v; 763 764 v = (u_int32_t)p[0] << 24; 765 v |= (u_int32_t)p[1] << 16; 766 v |= (u_int32_t)p[2] << 8; 767 v |= (u_int32_t)p[3]; 768 769 return (v); 770 } 771 772 u_int32_t 773 get_u32_le(const void *vp) 774 { 775 const u_char *p = (const u_char *)vp; 776 u_int32_t v; 777 778 v = (u_int32_t)p[0]; 779 v |= (u_int32_t)p[1] << 8; 780 v |= (u_int32_t)p[2] << 16; 781 v |= (u_int32_t)p[3] << 24; 782 783 return (v); 784 } 785 786 u_int16_t 787 get_u16(const void *vp) 788 { 789 const u_char *p = (const u_char *)vp; 790 u_int16_t v; 791 792 v = (u_int16_t)p[0] << 8; 793 v |= (u_int16_t)p[1]; 794 795 return (v); 796 } 797 798 void 799 put_u64(void *vp, u_int64_t v) 800 { 801 u_char *p = (u_char *)vp; 802 803 p[0] = (u_char)(v >> 56) & 0xff; 804 p[1] = (u_char)(v >> 48) & 0xff; 805 p[2] = (u_char)(v >> 40) & 0xff; 806 p[3] = (u_char)(v >> 32) & 0xff; 807 p[4] = (u_char)(v >> 24) & 0xff; 808 p[5] = (u_char)(v >> 16) & 0xff; 809 p[6] = (u_char)(v >> 8) & 0xff; 810 p[7] = (u_char)v & 0xff; 811 } 812 813 void 814 put_u32(void *vp, u_int32_t v) 815 { 816 u_char *p = (u_char *)vp; 817 818 p[0] = (u_char)(v >> 24) & 0xff; 819 p[1] = (u_char)(v >> 16) & 0xff; 820 p[2] = (u_char)(v >> 8) & 0xff; 821 p[3] = (u_char)v & 0xff; 822 } 823 824 void 825 put_u32_le(void *vp, u_int32_t v) 826 { 827 u_char *p = (u_char *)vp; 828 829 p[0] = (u_char)v & 0xff; 830 p[1] = (u_char)(v >> 8) & 0xff; 831 p[2] = (u_char)(v >> 16) & 0xff; 832 p[3] = (u_char)(v >> 24) & 0xff; 833 } 834 835 void 836 put_u16(void *vp, u_int16_t v) 837 { 838 u_char *p = (u_char *)vp; 839 840 p[0] = (u_char)(v >> 8) & 0xff; 841 p[1] = (u_char)v & 0xff; 842 } 843 844 void 845 ms_subtract_diff(struct timeval *start, int *ms) 846 { 847 struct timeval diff, finish; 848 849 gettimeofday(&finish, NULL); 850 timersub(&finish, start, &diff); 851 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 852 } 853 854 void 855 ms_to_timeval(struct timeval *tv, int ms) 856 { 857 if (ms < 0) 858 ms = 0; 859 tv->tv_sec = ms / 1000; 860 tv->tv_usec = (ms % 1000) * 1000; 861 } 862 863 time_t 864 monotime(void) 865 { 866 struct timespec ts; 867 868 if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) 869 fatal("clock_gettime: %s", strerror(errno)); 870 871 return (ts.tv_sec); 872 } 873 874 double 875 monotime_double(void) 876 { 877 struct timespec ts; 878 879 if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) 880 fatal("clock_gettime: %s", strerror(errno)); 881 882 return (ts.tv_sec + (double)ts.tv_nsec / 1000000000); 883 } 884 885 void 886 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 887 { 888 bw->buflen = buflen; 889 bw->rate = kbps; 890 bw->thresh = bw->rate; 891 bw->lamt = 0; 892 timerclear(&bw->bwstart); 893 timerclear(&bw->bwend); 894 } 895 896 /* Callback from read/write loop to insert bandwidth-limiting delays */ 897 void 898 bandwidth_limit(struct bwlimit *bw, size_t read_len) 899 { 900 u_int64_t waitlen; 901 struct timespec ts, rm; 902 903 if (!timerisset(&bw->bwstart)) { 904 gettimeofday(&bw->bwstart, NULL); 905 return; 906 } 907 908 bw->lamt += read_len; 909 if (bw->lamt < bw->thresh) 910 return; 911 912 gettimeofday(&bw->bwend, NULL); 913 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 914 if (!timerisset(&bw->bwend)) 915 return; 916 917 bw->lamt *= 8; 918 waitlen = (double)1000000L * bw->lamt / bw->rate; 919 920 bw->bwstart.tv_sec = waitlen / 1000000L; 921 bw->bwstart.tv_usec = waitlen % 1000000L; 922 923 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 924 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 925 926 /* Adjust the wait time */ 927 if (bw->bwend.tv_sec) { 928 bw->thresh /= 2; 929 if (bw->thresh < bw->buflen / 4) 930 bw->thresh = bw->buflen / 4; 931 } else if (bw->bwend.tv_usec < 10000) { 932 bw->thresh *= 2; 933 if (bw->thresh > bw->buflen * 8) 934 bw->thresh = bw->buflen * 8; 935 } 936 937 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 938 while (nanosleep(&ts, &rm) == -1) { 939 if (errno != EINTR) 940 break; 941 ts = rm; 942 } 943 } 944 945 bw->lamt = 0; 946 gettimeofday(&bw->bwstart, NULL); 947 } 948 949 /* Make a template filename for mk[sd]temp() */ 950 void 951 mktemp_proto(char *s, size_t len) 952 { 953 const char *tmpdir; 954 int r; 955 956 if ((tmpdir = getenv("TMPDIR")) != NULL) { 957 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 958 if (r > 0 && (size_t)r < len) 959 return; 960 } 961 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 962 if (r < 0 || (size_t)r >= len) 963 fatal("%s: template string too short", __func__); 964 } 965 966 static const struct { 967 const char *name; 968 int value; 969 } ipqos[] = { 970 { "af11", IPTOS_DSCP_AF11 }, 971 { "af12", IPTOS_DSCP_AF12 }, 972 { "af13", IPTOS_DSCP_AF13 }, 973 { "af21", IPTOS_DSCP_AF21 }, 974 { "af22", IPTOS_DSCP_AF22 }, 975 { "af23", IPTOS_DSCP_AF23 }, 976 { "af31", IPTOS_DSCP_AF31 }, 977 { "af32", IPTOS_DSCP_AF32 }, 978 { "af33", IPTOS_DSCP_AF33 }, 979 { "af41", IPTOS_DSCP_AF41 }, 980 { "af42", IPTOS_DSCP_AF42 }, 981 { "af43", IPTOS_DSCP_AF43 }, 982 { "cs0", IPTOS_DSCP_CS0 }, 983 { "cs1", IPTOS_DSCP_CS1 }, 984 { "cs2", IPTOS_DSCP_CS2 }, 985 { "cs3", IPTOS_DSCP_CS3 }, 986 { "cs4", IPTOS_DSCP_CS4 }, 987 { "cs5", IPTOS_DSCP_CS5 }, 988 { "cs6", IPTOS_DSCP_CS6 }, 989 { "cs7", IPTOS_DSCP_CS7 }, 990 { "ef", IPTOS_DSCP_EF }, 991 { "lowdelay", IPTOS_LOWDELAY }, 992 { "throughput", IPTOS_THROUGHPUT }, 993 { "reliability", IPTOS_RELIABILITY }, 994 { NULL, -1 } 995 }; 996 997 int 998 parse_ipqos(const char *cp) 999 { 1000 u_int i; 1001 char *ep; 1002 long val; 1003 1004 if (cp == NULL) 1005 return -1; 1006 for (i = 0; ipqos[i].name != NULL; i++) { 1007 if (strcasecmp(cp, ipqos[i].name) == 0) 1008 return ipqos[i].value; 1009 } 1010 /* Try parsing as an integer */ 1011 val = strtol(cp, &ep, 0); 1012 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1013 return -1; 1014 return val; 1015 } 1016 1017 const char * 1018 iptos2str(int iptos) 1019 { 1020 int i; 1021 static char iptos_str[sizeof "0xff"]; 1022 1023 for (i = 0; ipqos[i].name != NULL; i++) { 1024 if (ipqos[i].value == iptos) 1025 return ipqos[i].name; 1026 } 1027 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1028 return iptos_str; 1029 } 1030 1031 void 1032 lowercase(char *s) 1033 { 1034 for (; *s; s++) 1035 *s = tolower((u_char)*s); 1036 } 1037 1038 int 1039 unix_listener(const char *path, int backlog, int unlink_first) 1040 { 1041 struct sockaddr_un sunaddr; 1042 int saved_errno, sock; 1043 1044 memset(&sunaddr, 0, sizeof(sunaddr)); 1045 sunaddr.sun_family = AF_UNIX; 1046 if (strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { 1047 error("%s: \"%s\" too long for Unix domain socket", __func__, 1048 path); 1049 errno = ENAMETOOLONG; 1050 return -1; 1051 } 1052 1053 sock = socket(PF_UNIX, SOCK_STREAM, 0); 1054 if (sock < 0) { 1055 saved_errno = errno; 1056 error("socket: %.100s", strerror(errno)); 1057 errno = saved_errno; 1058 return -1; 1059 } 1060 if (unlink_first == 1) { 1061 if (unlink(path) != 0 && errno != ENOENT) 1062 error("unlink(%s): %.100s", path, strerror(errno)); 1063 } 1064 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) { 1065 saved_errno = errno; 1066 error("bind: %.100s", strerror(errno)); 1067 close(sock); 1068 error("%s: cannot bind to path: %s", __func__, path); 1069 errno = saved_errno; 1070 return -1; 1071 } 1072 if (listen(sock, backlog) < 0) { 1073 saved_errno = errno; 1074 error("listen: %.100s", strerror(errno)); 1075 close(sock); 1076 unlink(path); 1077 error("%s: cannot listen on path: %s", __func__, path); 1078 errno = saved_errno; 1079 return -1; 1080 } 1081 return sock; 1082 } 1083 1084 /* 1085 * Compares two strings that maybe be NULL. Returns non-zero if strings 1086 * are both NULL or are identical, returns zero otherwise. 1087 */ 1088 static int 1089 strcmp_maybe_null(const char *a, const char *b) 1090 { 1091 if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) 1092 return 0; 1093 if (a != NULL && strcmp(a, b) != 0) 1094 return 0; 1095 return 1; 1096 } 1097 1098 /* 1099 * Compare two forwards, returning non-zero if they are identical or 1100 * zero otherwise. 1101 */ 1102 int 1103 forward_equals(const struct Forward *a, const struct Forward *b) 1104 { 1105 if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) 1106 return 0; 1107 if (a->listen_port != b->listen_port) 1108 return 0; 1109 if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) 1110 return 0; 1111 if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) 1112 return 0; 1113 if (a->connect_port != b->connect_port) 1114 return 0; 1115 if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) 1116 return 0; 1117 /* allocated_port and handle are not checked */ 1118 return 1; 1119 } 1120 1121