1 /* $OpenBSD: misc.c,v 1.101 2016/01/20 09:22:39 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/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, 0); 88 if (val < 0) { 89 error("fcntl(%d, F_GETFL, 0): %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, 0); 112 if (val < 0) { 113 error("fcntl(%d, F_GETFL, 0): %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 /* function to assist building execv() arguments */ 455 void 456 addargs(arglist *args, char *fmt, ...) 457 { 458 va_list ap; 459 char *cp; 460 u_int nalloc; 461 int r; 462 463 va_start(ap, fmt); 464 r = vasprintf(&cp, fmt, ap); 465 va_end(ap); 466 if (r == -1) 467 fatal("addargs: argument too long"); 468 469 nalloc = args->nalloc; 470 if (args->list == NULL) { 471 nalloc = 32; 472 args->num = 0; 473 } else if (args->num+2 >= nalloc) 474 nalloc *= 2; 475 476 args->list = xreallocarray(args->list, nalloc, sizeof(char *)); 477 args->nalloc = nalloc; 478 args->list[args->num++] = cp; 479 args->list[args->num] = NULL; 480 } 481 482 void 483 replacearg(arglist *args, u_int which, char *fmt, ...) 484 { 485 va_list ap; 486 char *cp; 487 int r; 488 489 va_start(ap, fmt); 490 r = vasprintf(&cp, fmt, ap); 491 va_end(ap); 492 if (r == -1) 493 fatal("replacearg: argument too long"); 494 495 if (which >= args->num) 496 fatal("replacearg: tried to replace invalid arg %d >= %d", 497 which, args->num); 498 free(args->list[which]); 499 args->list[which] = cp; 500 } 501 502 void 503 freeargs(arglist *args) 504 { 505 u_int i; 506 507 if (args->list != NULL) { 508 for (i = 0; i < args->num; i++) 509 free(args->list[i]); 510 free(args->list); 511 args->nalloc = args->num = 0; 512 args->list = NULL; 513 } 514 } 515 516 /* 517 * Expands tildes in the file name. Returns data allocated by xmalloc. 518 * Warning: this calls getpw*. 519 */ 520 char * 521 tilde_expand_filename(const char *filename, uid_t uid) 522 { 523 const char *path, *sep; 524 char user[128], *ret; 525 struct passwd *pw; 526 u_int len, slash; 527 528 if (*filename != '~') 529 return (xstrdup(filename)); 530 filename++; 531 532 path = strchr(filename, '/'); 533 if (path != NULL && path > filename) { /* ~user/path */ 534 slash = path - filename; 535 if (slash > sizeof(user) - 1) 536 fatal("tilde_expand_filename: ~username too long"); 537 memcpy(user, filename, slash); 538 user[slash] = '\0'; 539 if ((pw = getpwnam(user)) == NULL) 540 fatal("tilde_expand_filename: No such user %s", user); 541 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 542 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 543 544 /* Make sure directory has a trailing '/' */ 545 len = strlen(pw->pw_dir); 546 if (len == 0 || pw->pw_dir[len - 1] != '/') 547 sep = "/"; 548 else 549 sep = ""; 550 551 /* Skip leading '/' from specified path */ 552 if (path != NULL) 553 filename = path + 1; 554 555 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) 556 fatal("tilde_expand_filename: Path too long"); 557 558 return (ret); 559 } 560 561 /* 562 * Expand a string with a set of %[char] escapes. A number of escapes may be 563 * specified as (char *escape_chars, char *replacement) pairs. The list must 564 * be terminated by a NULL escape_char. Returns replaced string in memory 565 * allocated by xmalloc. 566 */ 567 char * 568 percent_expand(const char *string, ...) 569 { 570 #define EXPAND_MAX_KEYS 16 571 u_int num_keys, i, j; 572 struct { 573 const char *key; 574 const char *repl; 575 } keys[EXPAND_MAX_KEYS]; 576 char buf[4096]; 577 va_list ap; 578 579 /* Gather keys */ 580 va_start(ap, string); 581 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 582 keys[num_keys].key = va_arg(ap, char *); 583 if (keys[num_keys].key == NULL) 584 break; 585 keys[num_keys].repl = va_arg(ap, char *); 586 if (keys[num_keys].repl == NULL) 587 fatal("%s: NULL replacement", __func__); 588 } 589 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 590 fatal("%s: too many keys", __func__); 591 va_end(ap); 592 593 /* Expand string */ 594 *buf = '\0'; 595 for (i = 0; *string != '\0'; string++) { 596 if (*string != '%') { 597 append: 598 buf[i++] = *string; 599 if (i >= sizeof(buf)) 600 fatal("%s: string too long", __func__); 601 buf[i] = '\0'; 602 continue; 603 } 604 string++; 605 /* %% case */ 606 if (*string == '%') 607 goto append; 608 if (*string == '\0') 609 fatal("%s: invalid format", __func__); 610 for (j = 0; j < num_keys; j++) { 611 if (strchr(keys[j].key, *string) != NULL) { 612 i = strlcat(buf, keys[j].repl, sizeof(buf)); 613 if (i >= sizeof(buf)) 614 fatal("%s: string too long", __func__); 615 break; 616 } 617 } 618 if (j >= num_keys) 619 fatal("%s: unknown key %%%c", __func__, *string); 620 } 621 return (xstrdup(buf)); 622 #undef EXPAND_MAX_KEYS 623 } 624 625 /* 626 * Read an entire line from a public key file into a static buffer, discarding 627 * lines that exceed the buffer size. Returns 0 on success, -1 on failure. 628 */ 629 int 630 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 631 u_long *lineno) 632 { 633 while (fgets(buf, bufsz, f) != NULL) { 634 if (buf[0] == '\0') 635 continue; 636 (*lineno)++; 637 if (buf[strlen(buf) - 1] == '\n' || feof(f)) { 638 return 0; 639 } else { 640 debug("%s: %s line %lu exceeds size limit", __func__, 641 filename, *lineno); 642 /* discard remainder of line */ 643 while (fgetc(f) != '\n' && !feof(f)) 644 ; /* nothing */ 645 } 646 } 647 return -1; 648 } 649 650 int 651 tun_open(int tun, int mode) 652 { 653 #if defined(CUSTOM_SYS_TUN_OPEN) 654 return (sys_tun_open(tun, mode)); 655 #elif defined(SSH_TUN_OPENBSD) 656 struct ifreq ifr; 657 char name[100]; 658 int fd = -1, sock; 659 const char *tunbase = "tun"; 660 661 if (mode == SSH_TUNMODE_ETHERNET) 662 tunbase = "tap"; 663 664 /* Open the tunnel device */ 665 if (tun <= SSH_TUNID_MAX) { 666 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); 667 fd = open(name, O_RDWR); 668 } else if (tun == SSH_TUNID_ANY) { 669 for (tun = 100; tun >= 0; tun--) { 670 snprintf(name, sizeof(name), "/dev/%s%d", 671 tunbase, tun); 672 if ((fd = open(name, O_RDWR)) >= 0) 673 break; 674 } 675 } else { 676 debug("%s: invalid tunnel %u", __func__, tun); 677 return -1; 678 } 679 680 if (fd < 0) { 681 debug("%s: %s open: %s", __func__, name, strerror(errno)); 682 return -1; 683 } 684 685 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 686 687 /* Bring interface up if it is not already */ 688 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); 689 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 690 goto failed; 691 692 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { 693 debug("%s: get interface %s flags: %s", __func__, 694 ifr.ifr_name, strerror(errno)); 695 goto failed; 696 } 697 698 if (!(ifr.ifr_flags & IFF_UP)) { 699 ifr.ifr_flags |= IFF_UP; 700 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { 701 debug("%s: activate interface %s: %s", __func__, 702 ifr.ifr_name, strerror(errno)); 703 goto failed; 704 } 705 } 706 707 close(sock); 708 return fd; 709 710 failed: 711 if (fd >= 0) 712 close(fd); 713 if (sock >= 0) 714 close(sock); 715 return -1; 716 #else 717 error("Tunnel interfaces are not supported on this platform"); 718 return (-1); 719 #endif 720 } 721 722 void 723 sanitise_stdfd(void) 724 { 725 int nullfd, dupfd; 726 727 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 728 fprintf(stderr, "Couldn't open /dev/null: %s\n", 729 strerror(errno)); 730 exit(1); 731 } 732 while (++dupfd <= 2) { 733 /* Only clobber closed fds */ 734 if (fcntl(dupfd, F_GETFL, 0) >= 0) 735 continue; 736 if (dup2(nullfd, dupfd) == -1) { 737 fprintf(stderr, "dup2: %s\n", strerror(errno)); 738 exit(1); 739 } 740 } 741 if (nullfd > 2) 742 close(nullfd); 743 } 744 745 char * 746 tohex(const void *vp, size_t l) 747 { 748 const u_char *p = (const u_char *)vp; 749 char b[3], *r; 750 size_t i, hl; 751 752 if (l > 65536) 753 return xstrdup("tohex: length > 65536"); 754 755 hl = l * 2 + 1; 756 r = xcalloc(1, hl); 757 for (i = 0; i < l; i++) { 758 snprintf(b, sizeof(b), "%02x", p[i]); 759 strlcat(r, b, hl); 760 } 761 return (r); 762 } 763 764 u_int64_t 765 get_u64(const void *vp) 766 { 767 const u_char *p = (const u_char *)vp; 768 u_int64_t v; 769 770 v = (u_int64_t)p[0] << 56; 771 v |= (u_int64_t)p[1] << 48; 772 v |= (u_int64_t)p[2] << 40; 773 v |= (u_int64_t)p[3] << 32; 774 v |= (u_int64_t)p[4] << 24; 775 v |= (u_int64_t)p[5] << 16; 776 v |= (u_int64_t)p[6] << 8; 777 v |= (u_int64_t)p[7]; 778 779 return (v); 780 } 781 782 u_int32_t 783 get_u32(const void *vp) 784 { 785 const u_char *p = (const u_char *)vp; 786 u_int32_t v; 787 788 v = (u_int32_t)p[0] << 24; 789 v |= (u_int32_t)p[1] << 16; 790 v |= (u_int32_t)p[2] << 8; 791 v |= (u_int32_t)p[3]; 792 793 return (v); 794 } 795 796 u_int32_t 797 get_u32_le(const void *vp) 798 { 799 const u_char *p = (const u_char *)vp; 800 u_int32_t v; 801 802 v = (u_int32_t)p[0]; 803 v |= (u_int32_t)p[1] << 8; 804 v |= (u_int32_t)p[2] << 16; 805 v |= (u_int32_t)p[3] << 24; 806 807 return (v); 808 } 809 810 u_int16_t 811 get_u16(const void *vp) 812 { 813 const u_char *p = (const u_char *)vp; 814 u_int16_t v; 815 816 v = (u_int16_t)p[0] << 8; 817 v |= (u_int16_t)p[1]; 818 819 return (v); 820 } 821 822 void 823 put_u64(void *vp, u_int64_t v) 824 { 825 u_char *p = (u_char *)vp; 826 827 p[0] = (u_char)(v >> 56) & 0xff; 828 p[1] = (u_char)(v >> 48) & 0xff; 829 p[2] = (u_char)(v >> 40) & 0xff; 830 p[3] = (u_char)(v >> 32) & 0xff; 831 p[4] = (u_char)(v >> 24) & 0xff; 832 p[5] = (u_char)(v >> 16) & 0xff; 833 p[6] = (u_char)(v >> 8) & 0xff; 834 p[7] = (u_char)v & 0xff; 835 } 836 837 void 838 put_u32(void *vp, u_int32_t v) 839 { 840 u_char *p = (u_char *)vp; 841 842 p[0] = (u_char)(v >> 24) & 0xff; 843 p[1] = (u_char)(v >> 16) & 0xff; 844 p[2] = (u_char)(v >> 8) & 0xff; 845 p[3] = (u_char)v & 0xff; 846 } 847 848 void 849 put_u32_le(void *vp, u_int32_t v) 850 { 851 u_char *p = (u_char *)vp; 852 853 p[0] = (u_char)v & 0xff; 854 p[1] = (u_char)(v >> 8) & 0xff; 855 p[2] = (u_char)(v >> 16) & 0xff; 856 p[3] = (u_char)(v >> 24) & 0xff; 857 } 858 859 void 860 put_u16(void *vp, u_int16_t v) 861 { 862 u_char *p = (u_char *)vp; 863 864 p[0] = (u_char)(v >> 8) & 0xff; 865 p[1] = (u_char)v & 0xff; 866 } 867 868 void 869 ms_subtract_diff(struct timeval *start, int *ms) 870 { 871 struct timeval diff, finish; 872 873 gettimeofday(&finish, NULL); 874 timersub(&finish, start, &diff); 875 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 876 } 877 878 void 879 ms_to_timeval(struct timeval *tv, int ms) 880 { 881 if (ms < 0) 882 ms = 0; 883 tv->tv_sec = ms / 1000; 884 tv->tv_usec = (ms % 1000) * 1000; 885 } 886 887 time_t 888 monotime(void) 889 { 890 #if defined(HAVE_CLOCK_GETTIME) && \ 891 (defined(CLOCK_MONOTONIC) || defined(CLOCK_BOOTTIME)) 892 struct timespec ts; 893 static int gettime_failed = 0; 894 895 if (!gettime_failed) { 896 #if defined(CLOCK_BOOTTIME) 897 if (clock_gettime(CLOCK_BOOTTIME, &ts) == 0) 898 return (ts.tv_sec); 899 #endif 900 #if defined(CLOCK_MONOTONIC) 901 if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) 902 return (ts.tv_sec); 903 #endif 904 debug3("clock_gettime: %s", strerror(errno)); 905 gettime_failed = 1; 906 } 907 #endif /* HAVE_CLOCK_GETTIME && (CLOCK_MONOTONIC || CLOCK_BOOTTIME */ 908 909 return time(NULL); 910 } 911 912 void 913 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 914 { 915 bw->buflen = buflen; 916 bw->rate = kbps; 917 bw->thresh = bw->rate; 918 bw->lamt = 0; 919 timerclear(&bw->bwstart); 920 timerclear(&bw->bwend); 921 } 922 923 /* Callback from read/write loop to insert bandwidth-limiting delays */ 924 void 925 bandwidth_limit(struct bwlimit *bw, size_t read_len) 926 { 927 u_int64_t waitlen; 928 struct timespec ts, rm; 929 930 if (!timerisset(&bw->bwstart)) { 931 gettimeofday(&bw->bwstart, NULL); 932 return; 933 } 934 935 bw->lamt += read_len; 936 if (bw->lamt < bw->thresh) 937 return; 938 939 gettimeofday(&bw->bwend, NULL); 940 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 941 if (!timerisset(&bw->bwend)) 942 return; 943 944 bw->lamt *= 8; 945 waitlen = (double)1000000L * bw->lamt / bw->rate; 946 947 bw->bwstart.tv_sec = waitlen / 1000000L; 948 bw->bwstart.tv_usec = waitlen % 1000000L; 949 950 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 951 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 952 953 /* Adjust the wait time */ 954 if (bw->bwend.tv_sec) { 955 bw->thresh /= 2; 956 if (bw->thresh < bw->buflen / 4) 957 bw->thresh = bw->buflen / 4; 958 } else if (bw->bwend.tv_usec < 10000) { 959 bw->thresh *= 2; 960 if (bw->thresh > bw->buflen * 8) 961 bw->thresh = bw->buflen * 8; 962 } 963 964 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 965 while (nanosleep(&ts, &rm) == -1) { 966 if (errno != EINTR) 967 break; 968 ts = rm; 969 } 970 } 971 972 bw->lamt = 0; 973 gettimeofday(&bw->bwstart, NULL); 974 } 975 976 /* Make a template filename for mk[sd]temp() */ 977 void 978 mktemp_proto(char *s, size_t len) 979 { 980 const char *tmpdir; 981 int r; 982 983 if ((tmpdir = getenv("TMPDIR")) != NULL) { 984 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 985 if (r > 0 && (size_t)r < len) 986 return; 987 } 988 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 989 if (r < 0 || (size_t)r >= len) 990 fatal("%s: template string too short", __func__); 991 } 992 993 static const struct { 994 const char *name; 995 int value; 996 } ipqos[] = { 997 { "af11", IPTOS_DSCP_AF11 }, 998 { "af12", IPTOS_DSCP_AF12 }, 999 { "af13", IPTOS_DSCP_AF13 }, 1000 { "af21", IPTOS_DSCP_AF21 }, 1001 { "af22", IPTOS_DSCP_AF22 }, 1002 { "af23", IPTOS_DSCP_AF23 }, 1003 { "af31", IPTOS_DSCP_AF31 }, 1004 { "af32", IPTOS_DSCP_AF32 }, 1005 { "af33", IPTOS_DSCP_AF33 }, 1006 { "af41", IPTOS_DSCP_AF41 }, 1007 { "af42", IPTOS_DSCP_AF42 }, 1008 { "af43", IPTOS_DSCP_AF43 }, 1009 { "cs0", IPTOS_DSCP_CS0 }, 1010 { "cs1", IPTOS_DSCP_CS1 }, 1011 { "cs2", IPTOS_DSCP_CS2 }, 1012 { "cs3", IPTOS_DSCP_CS3 }, 1013 { "cs4", IPTOS_DSCP_CS4 }, 1014 { "cs5", IPTOS_DSCP_CS5 }, 1015 { "cs6", IPTOS_DSCP_CS6 }, 1016 { "cs7", IPTOS_DSCP_CS7 }, 1017 { "ef", IPTOS_DSCP_EF }, 1018 { "lowdelay", IPTOS_LOWDELAY }, 1019 { "throughput", IPTOS_THROUGHPUT }, 1020 { "reliability", IPTOS_RELIABILITY }, 1021 { NULL, -1 } 1022 }; 1023 1024 int 1025 parse_ipqos(const char *cp) 1026 { 1027 u_int i; 1028 char *ep; 1029 long val; 1030 1031 if (cp == NULL) 1032 return -1; 1033 for (i = 0; ipqos[i].name != NULL; i++) { 1034 if (strcasecmp(cp, ipqos[i].name) == 0) 1035 return ipqos[i].value; 1036 } 1037 /* Try parsing as an integer */ 1038 val = strtol(cp, &ep, 0); 1039 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1040 return -1; 1041 return val; 1042 } 1043 1044 const char * 1045 iptos2str(int iptos) 1046 { 1047 int i; 1048 static char iptos_str[sizeof "0xff"]; 1049 1050 for (i = 0; ipqos[i].name != NULL; i++) { 1051 if (ipqos[i].value == iptos) 1052 return ipqos[i].name; 1053 } 1054 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1055 return iptos_str; 1056 } 1057 1058 void 1059 lowercase(char *s) 1060 { 1061 for (; *s; s++) 1062 *s = tolower((u_char)*s); 1063 } 1064 1065 int 1066 unix_listener(const char *path, int backlog, int unlink_first) 1067 { 1068 struct sockaddr_un sunaddr; 1069 int saved_errno, sock; 1070 1071 memset(&sunaddr, 0, sizeof(sunaddr)); 1072 sunaddr.sun_family = AF_UNIX; 1073 if (strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { 1074 error("%s: \"%s\" too long for Unix domain socket", __func__, 1075 path); 1076 errno = ENAMETOOLONG; 1077 return -1; 1078 } 1079 1080 sock = socket(PF_UNIX, SOCK_STREAM, 0); 1081 if (sock < 0) { 1082 saved_errno = errno; 1083 error("socket: %.100s", strerror(errno)); 1084 errno = saved_errno; 1085 return -1; 1086 } 1087 if (unlink_first == 1) { 1088 if (unlink(path) != 0 && errno != ENOENT) 1089 error("unlink(%s): %.100s", path, strerror(errno)); 1090 } 1091 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) { 1092 saved_errno = errno; 1093 error("bind: %.100s", strerror(errno)); 1094 close(sock); 1095 error("%s: cannot bind to path: %s", __func__, path); 1096 errno = saved_errno; 1097 return -1; 1098 } 1099 if (listen(sock, backlog) < 0) { 1100 saved_errno = errno; 1101 error("listen: %.100s", strerror(errno)); 1102 close(sock); 1103 unlink(path); 1104 error("%s: cannot listen on path: %s", __func__, path); 1105 errno = saved_errno; 1106 return -1; 1107 } 1108 return sock; 1109 } 1110 1111 void 1112 sock_set_v6only(int s) 1113 { 1114 #if defined(IPV6_V6ONLY) && !defined(__OpenBSD__) 1115 int on = 1; 1116 1117 debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); 1118 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) 1119 error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); 1120 #endif 1121 } 1122