1 /* $OpenBSD: misc.c,v 1.91 2013/07/12 00:43:50 djm Exp $ */ 2 /* $FreeBSD$ */ 3 /* 4 * Copyright (c) 2000 Markus Friedl. All rights reserved. 5 * Copyright (c) 2005,2006 Damien Miller. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "includes.h" 29 30 #include <sys/types.h> 31 #include <sys/ioctl.h> 32 #include <sys/socket.h> 33 #include <sys/param.h> 34 35 #include <stdarg.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <time.h> 40 #include <unistd.h> 41 42 #include <netinet/in.h> 43 #include <netinet/in_systm.h> 44 #include <netinet/ip.h> 45 #include <netinet/tcp.h> 46 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <netdb.h> 50 #ifdef HAVE_PATHS_H 51 # include <paths.h> 52 #include <pwd.h> 53 #endif 54 #ifdef SSH_TUN_OPENBSD 55 #include <net/if.h> 56 #endif 57 58 #include "xmalloc.h" 59 #include "misc.h" 60 #include "log.h" 61 #include "ssh.h" 62 63 /* remove newline at end of string */ 64 char * 65 chop(char *s) 66 { 67 char *t = s; 68 while (*t) { 69 if (*t == '\n' || *t == '\r') { 70 *t = '\0'; 71 return s; 72 } 73 t++; 74 } 75 return s; 76 77 } 78 79 /* set/unset filedescriptor to non-blocking */ 80 int 81 set_nonblock(int fd) 82 { 83 int val; 84 85 val = fcntl(fd, F_GETFL, 0); 86 if (val < 0) { 87 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); 88 return (-1); 89 } 90 if (val & O_NONBLOCK) { 91 debug3("fd %d is O_NONBLOCK", fd); 92 return (0); 93 } 94 debug2("fd %d setting O_NONBLOCK", fd); 95 val |= O_NONBLOCK; 96 if (fcntl(fd, F_SETFL, val) == -1) { 97 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 98 strerror(errno)); 99 return (-1); 100 } 101 return (0); 102 } 103 104 int 105 unset_nonblock(int fd) 106 { 107 int val; 108 109 val = fcntl(fd, F_GETFL, 0); 110 if (val < 0) { 111 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); 112 return (-1); 113 } 114 if (!(val & O_NONBLOCK)) { 115 debug3("fd %d is not O_NONBLOCK", fd); 116 return (0); 117 } 118 debug("fd %d clearing O_NONBLOCK", fd); 119 val &= ~O_NONBLOCK; 120 if (fcntl(fd, F_SETFL, val) == -1) { 121 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 122 fd, strerror(errno)); 123 return (-1); 124 } 125 return (0); 126 } 127 128 const char * 129 ssh_gai_strerror(int gaierr) 130 { 131 if (gaierr == EAI_SYSTEM && errno != 0) 132 return strerror(errno); 133 return gai_strerror(gaierr); 134 } 135 136 /* disable nagle on socket */ 137 void 138 set_nodelay(int fd) 139 { 140 int opt; 141 socklen_t optlen; 142 143 optlen = sizeof opt; 144 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 145 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 146 return; 147 } 148 if (opt == 1) { 149 debug2("fd %d is TCP_NODELAY", fd); 150 return; 151 } 152 opt = 1; 153 debug2("fd %d setting TCP_NODELAY", fd); 154 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 155 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 156 } 157 158 /* Characters considered whitespace in strsep calls. */ 159 #define WHITESPACE " \t\r\n" 160 #define QUOTE "\"" 161 162 /* return next token in configuration line */ 163 char * 164 strdelim(char **s) 165 { 166 char *old; 167 int wspace = 0; 168 169 if (*s == NULL) 170 return NULL; 171 172 old = *s; 173 174 *s = strpbrk(*s, WHITESPACE QUOTE "="); 175 if (*s == NULL) 176 return (old); 177 178 if (*s[0] == '\"') { 179 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 180 /* Find matching quote */ 181 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 182 return (NULL); /* no matching quote */ 183 } else { 184 *s[0] = '\0'; 185 *s += strspn(*s + 1, WHITESPACE) + 1; 186 return (old); 187 } 188 } 189 190 /* Allow only one '=' to be skipped */ 191 if (*s[0] == '=') 192 wspace = 1; 193 *s[0] = '\0'; 194 195 /* Skip any extra whitespace after first token */ 196 *s += strspn(*s + 1, WHITESPACE) + 1; 197 if (*s[0] == '=' && !wspace) 198 *s += strspn(*s + 1, WHITESPACE) + 1; 199 200 return (old); 201 } 202 203 struct passwd * 204 pwcopy(struct passwd *pw) 205 { 206 struct passwd *copy = xcalloc(1, sizeof(*copy)); 207 208 copy->pw_name = xstrdup(pw->pw_name); 209 copy->pw_passwd = xstrdup(pw->pw_passwd); 210 #ifdef HAVE_STRUCT_PASSWD_PW_GECOS 211 copy->pw_gecos = xstrdup(pw->pw_gecos); 212 #endif 213 copy->pw_uid = pw->pw_uid; 214 copy->pw_gid = pw->pw_gid; 215 #ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE 216 copy->pw_expire = pw->pw_expire; 217 #endif 218 #ifdef HAVE_STRUCT_PASSWD_PW_CHANGE 219 copy->pw_change = pw->pw_change; 220 #endif 221 #ifdef HAVE_STRUCT_PASSWD_PW_CLASS 222 copy->pw_class = xstrdup(pw->pw_class); 223 #endif 224 copy->pw_dir = xstrdup(pw->pw_dir); 225 copy->pw_shell = xstrdup(pw->pw_shell); 226 return copy; 227 } 228 229 /* 230 * Convert ASCII string to TCP/IP port number. 231 * Port must be >=0 and <=65535. 232 * Return -1 if invalid. 233 */ 234 int 235 a2port(const char *s) 236 { 237 long long port; 238 const char *errstr; 239 240 port = strtonum(s, 0, 65535, &errstr); 241 if (errstr != NULL) 242 return -1; 243 return (int)port; 244 } 245 246 int 247 a2tun(const char *s, int *remote) 248 { 249 const char *errstr = NULL; 250 char *sp, *ep; 251 int tun; 252 253 if (remote != NULL) { 254 *remote = SSH_TUNID_ANY; 255 sp = xstrdup(s); 256 if ((ep = strchr(sp, ':')) == NULL) { 257 free(sp); 258 return (a2tun(s, NULL)); 259 } 260 ep[0] = '\0'; ep++; 261 *remote = a2tun(ep, NULL); 262 tun = a2tun(sp, NULL); 263 free(sp); 264 return (*remote == SSH_TUNID_ERR ? *remote : tun); 265 } 266 267 if (strcasecmp(s, "any") == 0) 268 return (SSH_TUNID_ANY); 269 270 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 271 if (errstr != NULL) 272 return (SSH_TUNID_ERR); 273 274 return (tun); 275 } 276 277 #define SECONDS 1 278 #define MINUTES (SECONDS * 60) 279 #define HOURS (MINUTES * 60) 280 #define DAYS (HOURS * 24) 281 #define WEEKS (DAYS * 7) 282 283 /* 284 * Convert a time string into seconds; format is 285 * a sequence of: 286 * time[qualifier] 287 * 288 * Valid time qualifiers are: 289 * <none> seconds 290 * s|S seconds 291 * m|M minutes 292 * h|H hours 293 * d|D days 294 * w|W weeks 295 * 296 * Examples: 297 * 90m 90 minutes 298 * 1h30m 90 minutes 299 * 2d 2 days 300 * 1w 1 week 301 * 302 * Return -1 if time string is invalid. 303 */ 304 long 305 convtime(const char *s) 306 { 307 long total, secs; 308 const char *p; 309 char *endp; 310 311 errno = 0; 312 total = 0; 313 p = s; 314 315 if (p == NULL || *p == '\0') 316 return -1; 317 318 while (*p) { 319 secs = strtol(p, &endp, 10); 320 if (p == endp || 321 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || 322 secs < 0) 323 return -1; 324 325 switch (*endp++) { 326 case '\0': 327 endp--; 328 break; 329 case 's': 330 case 'S': 331 break; 332 case 'm': 333 case 'M': 334 secs *= MINUTES; 335 break; 336 case 'h': 337 case 'H': 338 secs *= HOURS; 339 break; 340 case 'd': 341 case 'D': 342 secs *= DAYS; 343 break; 344 case 'w': 345 case 'W': 346 secs *= WEEKS; 347 break; 348 default: 349 return -1; 350 } 351 total += secs; 352 if (total < 0) 353 return -1; 354 p = endp; 355 } 356 357 return total; 358 } 359 360 /* 361 * Returns a standardized host+port identifier string. 362 * Caller must free returned string. 363 */ 364 char * 365 put_host_port(const char *host, u_short port) 366 { 367 char *hoststr; 368 369 if (port == 0 || port == SSH_DEFAULT_PORT) 370 return(xstrdup(host)); 371 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) 372 fatal("put_host_port: asprintf: %s", strerror(errno)); 373 debug3("put_host_port: %s", hoststr); 374 return hoststr; 375 } 376 377 /* 378 * Search for next delimiter between hostnames/addresses and ports. 379 * Argument may be modified (for termination). 380 * Returns *cp if parsing succeeds. 381 * *cp is set to the start of the next delimiter, if one was found. 382 * If this is the last field, *cp is set to NULL. 383 */ 384 char * 385 hpdelim(char **cp) 386 { 387 char *s, *old; 388 389 if (cp == NULL || *cp == NULL) 390 return NULL; 391 392 old = s = *cp; 393 if (*s == '[') { 394 if ((s = strchr(s, ']')) == NULL) 395 return NULL; 396 else 397 s++; 398 } else if ((s = strpbrk(s, ":/")) == NULL) 399 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 400 401 switch (*s) { 402 case '\0': 403 *cp = NULL; /* no more fields*/ 404 break; 405 406 case ':': 407 case '/': 408 *s = '\0'; /* terminate */ 409 *cp = s + 1; 410 break; 411 412 default: 413 return NULL; 414 } 415 416 return old; 417 } 418 419 char * 420 cleanhostname(char *host) 421 { 422 if (*host == '[' && host[strlen(host) - 1] == ']') { 423 host[strlen(host) - 1] = '\0'; 424 return (host + 1); 425 } else 426 return host; 427 } 428 429 char * 430 colon(char *cp) 431 { 432 int flag = 0; 433 434 if (*cp == ':') /* Leading colon is part of file name. */ 435 return NULL; 436 if (*cp == '[') 437 flag = 1; 438 439 for (; *cp; ++cp) { 440 if (*cp == '@' && *(cp+1) == '[') 441 flag = 1; 442 if (*cp == ']' && *(cp+1) == ':' && flag) 443 return (cp+1); 444 if (*cp == ':' && !flag) 445 return (cp); 446 if (*cp == '/') 447 return NULL; 448 } 449 return NULL; 450 } 451 452 /* function to assist building execv() arguments */ 453 void 454 addargs(arglist *args, char *fmt, ...) 455 { 456 va_list ap; 457 char *cp; 458 u_int nalloc; 459 int r; 460 461 va_start(ap, fmt); 462 r = vasprintf(&cp, fmt, ap); 463 va_end(ap); 464 if (r == -1) 465 fatal("addargs: argument too long"); 466 467 nalloc = args->nalloc; 468 if (args->list == NULL) { 469 nalloc = 32; 470 args->num = 0; 471 } else if (args->num+2 >= nalloc) 472 nalloc *= 2; 473 474 args->list = xrealloc(args->list, nalloc, sizeof(char *)); 475 args->nalloc = nalloc; 476 args->list[args->num++] = cp; 477 args->list[args->num] = NULL; 478 } 479 480 void 481 replacearg(arglist *args, u_int which, char *fmt, ...) 482 { 483 va_list ap; 484 char *cp; 485 int r; 486 487 va_start(ap, fmt); 488 r = vasprintf(&cp, fmt, ap); 489 va_end(ap); 490 if (r == -1) 491 fatal("replacearg: argument too long"); 492 493 if (which >= args->num) 494 fatal("replacearg: tried to replace invalid arg %d >= %d", 495 which, args->num); 496 free(args->list[which]); 497 args->list[which] = cp; 498 } 499 500 void 501 freeargs(arglist *args) 502 { 503 u_int i; 504 505 if (args->list != NULL) { 506 for (i = 0; i < args->num; i++) 507 free(args->list[i]); 508 free(args->list); 509 args->nalloc = args->num = 0; 510 args->list = NULL; 511 } 512 } 513 514 /* 515 * Expands tildes in the file name. Returns data allocated by xmalloc. 516 * Warning: this calls getpw*. 517 */ 518 char * 519 tilde_expand_filename(const char *filename, uid_t uid) 520 { 521 const char *path, *sep; 522 char user[128], *ret; 523 struct passwd *pw; 524 u_int len, slash; 525 526 if (*filename != '~') 527 return (xstrdup(filename)); 528 filename++; 529 530 path = strchr(filename, '/'); 531 if (path != NULL && path > filename) { /* ~user/path */ 532 slash = path - filename; 533 if (slash > sizeof(user) - 1) 534 fatal("tilde_expand_filename: ~username too long"); 535 memcpy(user, filename, slash); 536 user[slash] = '\0'; 537 if ((pw = getpwnam(user)) == NULL) 538 fatal("tilde_expand_filename: No such user %s", user); 539 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 540 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 541 542 /* Make sure directory has a trailing '/' */ 543 len = strlen(pw->pw_dir); 544 if (len == 0 || pw->pw_dir[len - 1] != '/') 545 sep = "/"; 546 else 547 sep = ""; 548 549 /* Skip leading '/' from specified path */ 550 if (path != NULL) 551 filename = path + 1; 552 553 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= MAXPATHLEN) 554 fatal("tilde_expand_filename: Path too long"); 555 556 return (ret); 557 } 558 559 /* 560 * Expand a string with a set of %[char] escapes. A number of escapes may be 561 * specified as (char *escape_chars, char *replacement) pairs. The list must 562 * be terminated by a NULL escape_char. Returns replaced string in memory 563 * allocated by xmalloc. 564 */ 565 char * 566 percent_expand(const char *string, ...) 567 { 568 #define EXPAND_MAX_KEYS 16 569 u_int num_keys, i, j; 570 struct { 571 const char *key; 572 const char *repl; 573 } keys[EXPAND_MAX_KEYS]; 574 char buf[4096]; 575 va_list ap; 576 577 /* Gather keys */ 578 va_start(ap, string); 579 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 580 keys[num_keys].key = va_arg(ap, char *); 581 if (keys[num_keys].key == NULL) 582 break; 583 keys[num_keys].repl = va_arg(ap, char *); 584 if (keys[num_keys].repl == NULL) 585 fatal("%s: NULL replacement", __func__); 586 } 587 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 588 fatal("%s: too many keys", __func__); 589 va_end(ap); 590 591 /* Expand string */ 592 *buf = '\0'; 593 for (i = 0; *string != '\0'; string++) { 594 if (*string != '%') { 595 append: 596 buf[i++] = *string; 597 if (i >= sizeof(buf)) 598 fatal("%s: string too long", __func__); 599 buf[i] = '\0'; 600 continue; 601 } 602 string++; 603 /* %% case */ 604 if (*string == '%') 605 goto append; 606 for (j = 0; j < num_keys; j++) { 607 if (strchr(keys[j].key, *string) != NULL) { 608 i = strlcat(buf, keys[j].repl, sizeof(buf)); 609 if (i >= sizeof(buf)) 610 fatal("%s: string too long", __func__); 611 break; 612 } 613 } 614 if (j >= num_keys) 615 fatal("%s: unknown key %%%c", __func__, *string); 616 } 617 return (xstrdup(buf)); 618 #undef EXPAND_MAX_KEYS 619 } 620 621 /* 622 * Read an entire line from a public key file into a static buffer, discarding 623 * lines that exceed the buffer size. Returns 0 on success, -1 on failure. 624 */ 625 int 626 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 627 u_long *lineno) 628 { 629 while (fgets(buf, bufsz, f) != NULL) { 630 if (buf[0] == '\0') 631 continue; 632 (*lineno)++; 633 if (buf[strlen(buf) - 1] == '\n' || feof(f)) { 634 return 0; 635 } else { 636 debug("%s: %s line %lu exceeds size limit", __func__, 637 filename, *lineno); 638 /* discard remainder of line */ 639 while (fgetc(f) != '\n' && !feof(f)) 640 ; /* nothing */ 641 } 642 } 643 return -1; 644 } 645 646 int 647 tun_open(int tun, int mode) 648 { 649 #if defined(CUSTOM_SYS_TUN_OPEN) 650 return (sys_tun_open(tun, mode)); 651 #elif defined(SSH_TUN_OPENBSD) 652 struct ifreq ifr; 653 char name[100]; 654 int fd = -1, sock; 655 656 /* Open the tunnel device */ 657 if (tun <= SSH_TUNID_MAX) { 658 snprintf(name, sizeof(name), "/dev/tun%d", tun); 659 fd = open(name, O_RDWR); 660 } else if (tun == SSH_TUNID_ANY) { 661 for (tun = 100; tun >= 0; tun--) { 662 snprintf(name, sizeof(name), "/dev/tun%d", tun); 663 if ((fd = open(name, O_RDWR)) >= 0) 664 break; 665 } 666 } else { 667 debug("%s: invalid tunnel %u", __func__, tun); 668 return (-1); 669 } 670 671 if (fd < 0) { 672 debug("%s: %s open failed: %s", __func__, name, strerror(errno)); 673 return (-1); 674 } 675 676 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 677 678 /* Set the tunnel device operation mode */ 679 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); 680 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 681 goto failed; 682 683 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) 684 goto failed; 685 686 /* Set interface mode */ 687 ifr.ifr_flags &= ~IFF_UP; 688 if (mode == SSH_TUNMODE_ETHERNET) 689 ifr.ifr_flags |= IFF_LINK0; 690 else 691 ifr.ifr_flags &= ~IFF_LINK0; 692 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) 693 goto failed; 694 695 /* Bring interface up */ 696 ifr.ifr_flags |= IFF_UP; 697 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) 698 goto failed; 699 700 close(sock); 701 return (fd); 702 703 failed: 704 if (fd >= 0) 705 close(fd); 706 if (sock >= 0) 707 close(sock); 708 debug("%s: failed to set %s mode %d: %s", __func__, name, 709 mode, strerror(errno)); 710 return (-1); 711 #else 712 error("Tunnel interfaces are not supported on this platform"); 713 return (-1); 714 #endif 715 } 716 717 void 718 sanitise_stdfd(void) 719 { 720 int nullfd, dupfd; 721 722 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 723 fprintf(stderr, "Couldn't open /dev/null: %s\n", 724 strerror(errno)); 725 exit(1); 726 } 727 while (++dupfd <= 2) { 728 /* Only clobber closed fds */ 729 if (fcntl(dupfd, F_GETFL, 0) >= 0) 730 continue; 731 if (dup2(nullfd, dupfd) == -1) { 732 fprintf(stderr, "dup2: %s\n", strerror(errno)); 733 exit(1); 734 } 735 } 736 if (nullfd > 2) 737 close(nullfd); 738 } 739 740 char * 741 tohex(const void *vp, size_t l) 742 { 743 const u_char *p = (const u_char *)vp; 744 char b[3], *r; 745 size_t i, hl; 746 747 if (l > 65536) 748 return xstrdup("tohex: length > 65536"); 749 750 hl = l * 2 + 1; 751 r = xcalloc(1, hl); 752 for (i = 0; i < l; i++) { 753 snprintf(b, sizeof(b), "%02x", p[i]); 754 strlcat(r, b, hl); 755 } 756 return (r); 757 } 758 759 u_int64_t 760 get_u64(const void *vp) 761 { 762 const u_char *p = (const u_char *)vp; 763 u_int64_t v; 764 765 v = (u_int64_t)p[0] << 56; 766 v |= (u_int64_t)p[1] << 48; 767 v |= (u_int64_t)p[2] << 40; 768 v |= (u_int64_t)p[3] << 32; 769 v |= (u_int64_t)p[4] << 24; 770 v |= (u_int64_t)p[5] << 16; 771 v |= (u_int64_t)p[6] << 8; 772 v |= (u_int64_t)p[7]; 773 774 return (v); 775 } 776 777 u_int32_t 778 get_u32(const void *vp) 779 { 780 const u_char *p = (const u_char *)vp; 781 u_int32_t v; 782 783 v = (u_int32_t)p[0] << 24; 784 v |= (u_int32_t)p[1] << 16; 785 v |= (u_int32_t)p[2] << 8; 786 v |= (u_int32_t)p[3]; 787 788 return (v); 789 } 790 791 u_int16_t 792 get_u16(const void *vp) 793 { 794 const u_char *p = (const u_char *)vp; 795 u_int16_t v; 796 797 v = (u_int16_t)p[0] << 8; 798 v |= (u_int16_t)p[1]; 799 800 return (v); 801 } 802 803 void 804 put_u64(void *vp, u_int64_t v) 805 { 806 u_char *p = (u_char *)vp; 807 808 p[0] = (u_char)(v >> 56) & 0xff; 809 p[1] = (u_char)(v >> 48) & 0xff; 810 p[2] = (u_char)(v >> 40) & 0xff; 811 p[3] = (u_char)(v >> 32) & 0xff; 812 p[4] = (u_char)(v >> 24) & 0xff; 813 p[5] = (u_char)(v >> 16) & 0xff; 814 p[6] = (u_char)(v >> 8) & 0xff; 815 p[7] = (u_char)v & 0xff; 816 } 817 818 void 819 put_u32(void *vp, u_int32_t v) 820 { 821 u_char *p = (u_char *)vp; 822 823 p[0] = (u_char)(v >> 24) & 0xff; 824 p[1] = (u_char)(v >> 16) & 0xff; 825 p[2] = (u_char)(v >> 8) & 0xff; 826 p[3] = (u_char)v & 0xff; 827 } 828 829 830 void 831 put_u16(void *vp, u_int16_t v) 832 { 833 u_char *p = (u_char *)vp; 834 835 p[0] = (u_char)(v >> 8) & 0xff; 836 p[1] = (u_char)v & 0xff; 837 } 838 839 void 840 ms_subtract_diff(struct timeval *start, int *ms) 841 { 842 struct timeval diff, finish; 843 844 gettimeofday(&finish, NULL); 845 timersub(&finish, start, &diff); 846 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 847 } 848 849 void 850 ms_to_timeval(struct timeval *tv, int ms) 851 { 852 if (ms < 0) 853 ms = 0; 854 tv->tv_sec = ms / 1000; 855 tv->tv_usec = (ms % 1000) * 1000; 856 } 857 858 time_t 859 monotime(void) 860 { 861 #if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC) 862 struct timespec ts; 863 static int gettime_failed = 0; 864 865 if (!gettime_failed) { 866 if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) 867 return (ts.tv_sec); 868 debug3("clock_gettime: %s", strerror(errno)); 869 gettime_failed = 1; 870 } 871 #endif 872 873 return time(NULL); 874 } 875 876 void 877 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 878 { 879 bw->buflen = buflen; 880 bw->rate = kbps; 881 bw->thresh = bw->rate; 882 bw->lamt = 0; 883 timerclear(&bw->bwstart); 884 timerclear(&bw->bwend); 885 } 886 887 /* Callback from read/write loop to insert bandwidth-limiting delays */ 888 void 889 bandwidth_limit(struct bwlimit *bw, size_t read_len) 890 { 891 u_int64_t waitlen; 892 struct timespec ts, rm; 893 894 if (!timerisset(&bw->bwstart)) { 895 gettimeofday(&bw->bwstart, NULL); 896 return; 897 } 898 899 bw->lamt += read_len; 900 if (bw->lamt < bw->thresh) 901 return; 902 903 gettimeofday(&bw->bwend, NULL); 904 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 905 if (!timerisset(&bw->bwend)) 906 return; 907 908 bw->lamt *= 8; 909 waitlen = (double)1000000L * bw->lamt / bw->rate; 910 911 bw->bwstart.tv_sec = waitlen / 1000000L; 912 bw->bwstart.tv_usec = waitlen % 1000000L; 913 914 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 915 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 916 917 /* Adjust the wait time */ 918 if (bw->bwend.tv_sec) { 919 bw->thresh /= 2; 920 if (bw->thresh < bw->buflen / 4) 921 bw->thresh = bw->buflen / 4; 922 } else if (bw->bwend.tv_usec < 10000) { 923 bw->thresh *= 2; 924 if (bw->thresh > bw->buflen * 8) 925 bw->thresh = bw->buflen * 8; 926 } 927 928 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 929 while (nanosleep(&ts, &rm) == -1) { 930 if (errno != EINTR) 931 break; 932 ts = rm; 933 } 934 } 935 936 bw->lamt = 0; 937 gettimeofday(&bw->bwstart, NULL); 938 } 939 940 /* Make a template filename for mk[sd]temp() */ 941 void 942 mktemp_proto(char *s, size_t len) 943 { 944 const char *tmpdir; 945 int r; 946 947 if ((tmpdir = getenv("TMPDIR")) != NULL) { 948 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 949 if (r > 0 && (size_t)r < len) 950 return; 951 } 952 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 953 if (r < 0 || (size_t)r >= len) 954 fatal("%s: template string too short", __func__); 955 } 956 957 static const struct { 958 const char *name; 959 int value; 960 } ipqos[] = { 961 { "af11", IPTOS_DSCP_AF11 }, 962 { "af12", IPTOS_DSCP_AF12 }, 963 { "af13", IPTOS_DSCP_AF13 }, 964 { "af21", IPTOS_DSCP_AF21 }, 965 { "af22", IPTOS_DSCP_AF22 }, 966 { "af23", IPTOS_DSCP_AF23 }, 967 { "af31", IPTOS_DSCP_AF31 }, 968 { "af32", IPTOS_DSCP_AF32 }, 969 { "af33", IPTOS_DSCP_AF33 }, 970 { "af41", IPTOS_DSCP_AF41 }, 971 { "af42", IPTOS_DSCP_AF42 }, 972 { "af43", IPTOS_DSCP_AF43 }, 973 { "cs0", IPTOS_DSCP_CS0 }, 974 { "cs1", IPTOS_DSCP_CS1 }, 975 { "cs2", IPTOS_DSCP_CS2 }, 976 { "cs3", IPTOS_DSCP_CS3 }, 977 { "cs4", IPTOS_DSCP_CS4 }, 978 { "cs5", IPTOS_DSCP_CS5 }, 979 { "cs6", IPTOS_DSCP_CS6 }, 980 { "cs7", IPTOS_DSCP_CS7 }, 981 { "ef", IPTOS_DSCP_EF }, 982 { "lowdelay", IPTOS_LOWDELAY }, 983 { "throughput", IPTOS_THROUGHPUT }, 984 { "reliability", IPTOS_RELIABILITY }, 985 { NULL, -1 } 986 }; 987 988 int 989 parse_ipqos(const char *cp) 990 { 991 u_int i; 992 char *ep; 993 long val; 994 995 if (cp == NULL) 996 return -1; 997 for (i = 0; ipqos[i].name != NULL; i++) { 998 if (strcasecmp(cp, ipqos[i].name) == 0) 999 return ipqos[i].value; 1000 } 1001 /* Try parsing as an integer */ 1002 val = strtol(cp, &ep, 0); 1003 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1004 return -1; 1005 return val; 1006 } 1007 1008 const char * 1009 iptos2str(int iptos) 1010 { 1011 int i; 1012 static char iptos_str[sizeof "0xff"]; 1013 1014 for (i = 0; ipqos[i].name != NULL; i++) { 1015 if (ipqos[i].value == iptos) 1016 return ipqos[i].name; 1017 } 1018 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1019 return iptos_str; 1020 } 1021 void 1022 sock_set_v6only(int s) 1023 { 1024 #ifdef IPV6_V6ONLY 1025 int on = 1; 1026 1027 debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); 1028 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) 1029 error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); 1030 #endif 1031 } 1032 1033 void 1034 sock_get_rcvbuf(int *size, int rcvbuf) 1035 { 1036 int sock, socksize; 1037 socklen_t socksizelen = sizeof(socksize); 1038 1039 /* 1040 * Create a socket but do not connect it. We use it 1041 * only to get the rcv socket size. 1042 */ 1043 sock = socket(AF_INET6, SOCK_STREAM, 0); 1044 if (sock < 0) 1045 sock = socket(AF_INET, SOCK_STREAM, 0); 1046 if (sock < 0) 1047 return; 1048 1049 /* 1050 * If the tcp_rcv_buf option is set and passed in, attempt to set the 1051 * buffer size to its value. 1052 */ 1053 if (rcvbuf) 1054 setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *)&rcvbuf, 1055 sizeof(rcvbuf)); 1056 1057 if (getsockopt(sock, SOL_SOCKET, SO_RCVBUF, 1058 &socksize, &socksizelen) == 0) 1059 if (size != NULL) 1060 *size = socksize; 1061 close(sock); 1062 } 1063