1 /* $OpenBSD: misc.c,v 1.85 2011/03/29 18:54:17 stevesk 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/param.h> 33 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <time.h> 39 #include <unistd.h> 40 41 #include <netinet/in.h> 42 #include <netinet/in_systm.h> 43 #include <netinet/ip.h> 44 #include <netinet/tcp.h> 45 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <netdb.h> 49 #ifdef HAVE_PATHS_H 50 # include <paths.h> 51 #include <pwd.h> 52 #endif 53 #ifdef SSH_TUN_OPENBSD 54 #include <net/if.h> 55 #endif 56 57 #include "xmalloc.h" 58 #include "misc.h" 59 #include "log.h" 60 #include "ssh.h" 61 62 /* remove newline at end of string */ 63 char * 64 chop(char *s) 65 { 66 char *t = s; 67 while (*t) { 68 if (*t == '\n' || *t == '\r') { 69 *t = '\0'; 70 return s; 71 } 72 t++; 73 } 74 return s; 75 76 } 77 78 /* set/unset filedescriptor to non-blocking */ 79 int 80 set_nonblock(int fd) 81 { 82 int val; 83 84 val = fcntl(fd, F_GETFL, 0); 85 if (val < 0) { 86 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); 87 return (-1); 88 } 89 if (val & O_NONBLOCK) { 90 debug3("fd %d is O_NONBLOCK", fd); 91 return (0); 92 } 93 debug2("fd %d setting O_NONBLOCK", fd); 94 val |= O_NONBLOCK; 95 if (fcntl(fd, F_SETFL, val) == -1) { 96 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 97 strerror(errno)); 98 return (-1); 99 } 100 return (0); 101 } 102 103 int 104 unset_nonblock(int fd) 105 { 106 int val; 107 108 val = fcntl(fd, F_GETFL, 0); 109 if (val < 0) { 110 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); 111 return (-1); 112 } 113 if (!(val & O_NONBLOCK)) { 114 debug3("fd %d is not O_NONBLOCK", fd); 115 return (0); 116 } 117 debug("fd %d clearing O_NONBLOCK", fd); 118 val &= ~O_NONBLOCK; 119 if (fcntl(fd, F_SETFL, val) == -1) { 120 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 121 fd, strerror(errno)); 122 return (-1); 123 } 124 return (0); 125 } 126 127 const char * 128 ssh_gai_strerror(int gaierr) 129 { 130 if (gaierr == EAI_SYSTEM) 131 return strerror(errno); 132 return gai_strerror(gaierr); 133 } 134 135 /* disable nagle on socket */ 136 void 137 set_nodelay(int fd) 138 { 139 int opt; 140 socklen_t optlen; 141 142 optlen = sizeof opt; 143 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 144 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 145 return; 146 } 147 if (opt == 1) { 148 debug2("fd %d is TCP_NODELAY", fd); 149 return; 150 } 151 opt = 1; 152 debug2("fd %d setting TCP_NODELAY", fd); 153 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 154 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 155 } 156 157 /* Characters considered whitespace in strsep calls. */ 158 #define WHITESPACE " \t\r\n" 159 #define QUOTE "\"" 160 161 /* return next token in configuration line */ 162 char * 163 strdelim(char **s) 164 { 165 char *old; 166 int wspace = 0; 167 168 if (*s == NULL) 169 return NULL; 170 171 old = *s; 172 173 *s = strpbrk(*s, WHITESPACE QUOTE "="); 174 if (*s == NULL) 175 return (old); 176 177 if (*s[0] == '\"') { 178 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 179 /* Find matching quote */ 180 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 181 return (NULL); /* no matching quote */ 182 } else { 183 *s[0] = '\0'; 184 *s += strspn(*s + 1, WHITESPACE) + 1; 185 return (old); 186 } 187 } 188 189 /* Allow only one '=' to be skipped */ 190 if (*s[0] == '=') 191 wspace = 1; 192 *s[0] = '\0'; 193 194 /* Skip any extra whitespace after first token */ 195 *s += strspn(*s + 1, WHITESPACE) + 1; 196 if (*s[0] == '=' && !wspace) 197 *s += strspn(*s + 1, WHITESPACE) + 1; 198 199 return (old); 200 } 201 202 struct passwd * 203 pwcopy(struct passwd *pw) 204 { 205 struct passwd *copy = xcalloc(1, sizeof(*copy)); 206 207 copy->pw_name = xstrdup(pw->pw_name); 208 copy->pw_passwd = xstrdup(pw->pw_passwd); 209 copy->pw_gecos = xstrdup(pw->pw_gecos); 210 copy->pw_uid = pw->pw_uid; 211 copy->pw_gid = pw->pw_gid; 212 #ifdef HAVE_PW_EXPIRE_IN_PASSWD 213 copy->pw_expire = pw->pw_expire; 214 #endif 215 #ifdef HAVE_PW_CHANGE_IN_PASSWD 216 copy->pw_change = pw->pw_change; 217 #endif 218 #ifdef HAVE_PW_CLASS_IN_PASSWD 219 copy->pw_class = xstrdup(pw->pw_class); 220 #endif 221 copy->pw_dir = xstrdup(pw->pw_dir); 222 copy->pw_shell = xstrdup(pw->pw_shell); 223 return copy; 224 } 225 226 /* 227 * Convert ASCII string to TCP/IP port number. 228 * Port must be >=0 and <=65535. 229 * Return -1 if invalid. 230 */ 231 int 232 a2port(const char *s) 233 { 234 long long port; 235 const char *errstr; 236 237 port = strtonum(s, 0, 65535, &errstr); 238 if (errstr != NULL) 239 return -1; 240 return (int)port; 241 } 242 243 int 244 a2tun(const char *s, int *remote) 245 { 246 const char *errstr = NULL; 247 char *sp, *ep; 248 int tun; 249 250 if (remote != NULL) { 251 *remote = SSH_TUNID_ANY; 252 sp = xstrdup(s); 253 if ((ep = strchr(sp, ':')) == NULL) { 254 xfree(sp); 255 return (a2tun(s, NULL)); 256 } 257 ep[0] = '\0'; ep++; 258 *remote = a2tun(ep, NULL); 259 tun = a2tun(sp, NULL); 260 xfree(sp); 261 return (*remote == SSH_TUNID_ERR ? *remote : tun); 262 } 263 264 if (strcasecmp(s, "any") == 0) 265 return (SSH_TUNID_ANY); 266 267 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 268 if (errstr != NULL) 269 return (SSH_TUNID_ERR); 270 271 return (tun); 272 } 273 274 #define SECONDS 1 275 #define MINUTES (SECONDS * 60) 276 #define HOURS (MINUTES * 60) 277 #define DAYS (HOURS * 24) 278 #define WEEKS (DAYS * 7) 279 280 /* 281 * Convert a time string into seconds; format is 282 * a sequence of: 283 * time[qualifier] 284 * 285 * Valid time qualifiers are: 286 * <none> seconds 287 * s|S seconds 288 * m|M minutes 289 * h|H hours 290 * d|D days 291 * w|W weeks 292 * 293 * Examples: 294 * 90m 90 minutes 295 * 1h30m 90 minutes 296 * 2d 2 days 297 * 1w 1 week 298 * 299 * Return -1 if time string is invalid. 300 */ 301 long 302 convtime(const char *s) 303 { 304 long total, secs; 305 const char *p; 306 char *endp; 307 308 errno = 0; 309 total = 0; 310 p = s; 311 312 if (p == NULL || *p == '\0') 313 return -1; 314 315 while (*p) { 316 secs = strtol(p, &endp, 10); 317 if (p == endp || 318 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || 319 secs < 0) 320 return -1; 321 322 switch (*endp++) { 323 case '\0': 324 endp--; 325 break; 326 case 's': 327 case 'S': 328 break; 329 case 'm': 330 case 'M': 331 secs *= MINUTES; 332 break; 333 case 'h': 334 case 'H': 335 secs *= HOURS; 336 break; 337 case 'd': 338 case 'D': 339 secs *= DAYS; 340 break; 341 case 'w': 342 case 'W': 343 secs *= WEEKS; 344 break; 345 default: 346 return -1; 347 } 348 total += secs; 349 if (total < 0) 350 return -1; 351 p = endp; 352 } 353 354 return total; 355 } 356 357 /* 358 * Returns a standardized host+port identifier string. 359 * Caller must free returned string. 360 */ 361 char * 362 put_host_port(const char *host, u_short port) 363 { 364 char *hoststr; 365 366 if (port == 0 || port == SSH_DEFAULT_PORT) 367 return(xstrdup(host)); 368 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) 369 fatal("put_host_port: asprintf: %s", strerror(errno)); 370 debug3("put_host_port: %s", hoststr); 371 return hoststr; 372 } 373 374 /* 375 * Search for next delimiter between hostnames/addresses and ports. 376 * Argument may be modified (for termination). 377 * Returns *cp if parsing succeeds. 378 * *cp is set to the start of the next delimiter, if one was found. 379 * If this is the last field, *cp is set to NULL. 380 */ 381 char * 382 hpdelim(char **cp) 383 { 384 char *s, *old; 385 386 if (cp == NULL || *cp == NULL) 387 return NULL; 388 389 old = s = *cp; 390 if (*s == '[') { 391 if ((s = strchr(s, ']')) == NULL) 392 return NULL; 393 else 394 s++; 395 } else if ((s = strpbrk(s, ":/")) == NULL) 396 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 397 398 switch (*s) { 399 case '\0': 400 *cp = NULL; /* no more fields*/ 401 break; 402 403 case ':': 404 case '/': 405 *s = '\0'; /* terminate */ 406 *cp = s + 1; 407 break; 408 409 default: 410 return NULL; 411 } 412 413 return old; 414 } 415 416 char * 417 cleanhostname(char *host) 418 { 419 if (*host == '[' && host[strlen(host) - 1] == ']') { 420 host[strlen(host) - 1] = '\0'; 421 return (host + 1); 422 } else 423 return host; 424 } 425 426 char * 427 colon(char *cp) 428 { 429 int flag = 0; 430 431 if (*cp == ':') /* Leading colon is part of file name. */ 432 return NULL; 433 if (*cp == '[') 434 flag = 1; 435 436 for (; *cp; ++cp) { 437 if (*cp == '@' && *(cp+1) == '[') 438 flag = 1; 439 if (*cp == ']' && *(cp+1) == ':' && flag) 440 return (cp+1); 441 if (*cp == ':' && !flag) 442 return (cp); 443 if (*cp == '/') 444 return NULL; 445 } 446 return NULL; 447 } 448 449 /* function to assist building execv() arguments */ 450 void 451 addargs(arglist *args, char *fmt, ...) 452 { 453 va_list ap; 454 char *cp; 455 u_int nalloc; 456 int r; 457 458 va_start(ap, fmt); 459 r = vasprintf(&cp, fmt, ap); 460 va_end(ap); 461 if (r == -1) 462 fatal("addargs: argument too long"); 463 464 nalloc = args->nalloc; 465 if (args->list == NULL) { 466 nalloc = 32; 467 args->num = 0; 468 } else if (args->num+2 >= nalloc) 469 nalloc *= 2; 470 471 args->list = xrealloc(args->list, nalloc, sizeof(char *)); 472 args->nalloc = nalloc; 473 args->list[args->num++] = cp; 474 args->list[args->num] = NULL; 475 } 476 477 void 478 replacearg(arglist *args, u_int which, char *fmt, ...) 479 { 480 va_list ap; 481 char *cp; 482 int r; 483 484 va_start(ap, fmt); 485 r = vasprintf(&cp, fmt, ap); 486 va_end(ap); 487 if (r == -1) 488 fatal("replacearg: argument too long"); 489 490 if (which >= args->num) 491 fatal("replacearg: tried to replace invalid arg %d >= %d", 492 which, args->num); 493 xfree(args->list[which]); 494 args->list[which] = cp; 495 } 496 497 void 498 freeargs(arglist *args) 499 { 500 u_int i; 501 502 if (args->list != NULL) { 503 for (i = 0; i < args->num; i++) 504 xfree(args->list[i]); 505 xfree(args->list); 506 args->nalloc = args->num = 0; 507 args->list = NULL; 508 } 509 } 510 511 /* 512 * Expands tildes in the file name. Returns data allocated by xmalloc. 513 * Warning: this calls getpw*. 514 */ 515 char * 516 tilde_expand_filename(const char *filename, uid_t uid) 517 { 518 const char *path; 519 char user[128], ret[MAXPATHLEN]; 520 struct passwd *pw; 521 u_int len, slash; 522 523 if (*filename != '~') 524 return (xstrdup(filename)); 525 filename++; 526 527 path = strchr(filename, '/'); 528 if (path != NULL && path > filename) { /* ~user/path */ 529 slash = path - filename; 530 if (slash > sizeof(user) - 1) 531 fatal("tilde_expand_filename: ~username too long"); 532 memcpy(user, filename, slash); 533 user[slash] = '\0'; 534 if ((pw = getpwnam(user)) == NULL) 535 fatal("tilde_expand_filename: No such user %s", user); 536 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 537 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 538 539 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) 540 fatal("tilde_expand_filename: Path too long"); 541 542 /* Make sure directory has a trailing '/' */ 543 len = strlen(pw->pw_dir); 544 if ((len == 0 || pw->pw_dir[len - 1] != '/') && 545 strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) 546 fatal("tilde_expand_filename: Path too long"); 547 548 /* Skip leading '/' from specified path */ 549 if (path != NULL) 550 filename = path + 1; 551 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) 552 fatal("tilde_expand_filename: Path too long"); 553 554 return (xstrdup(ret)); 555 } 556 557 /* 558 * Expand a string with a set of %[char] escapes. A number of escapes may be 559 * specified as (char *escape_chars, char *replacement) pairs. The list must 560 * be terminated by a NULL escape_char. Returns replaced string in memory 561 * allocated by xmalloc. 562 */ 563 char * 564 percent_expand(const char *string, ...) 565 { 566 #define EXPAND_MAX_KEYS 16 567 u_int num_keys, i, j; 568 struct { 569 const char *key; 570 const char *repl; 571 } keys[EXPAND_MAX_KEYS]; 572 char buf[4096]; 573 va_list ap; 574 575 /* Gather keys */ 576 va_start(ap, string); 577 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 578 keys[num_keys].key = va_arg(ap, char *); 579 if (keys[num_keys].key == NULL) 580 break; 581 keys[num_keys].repl = va_arg(ap, char *); 582 if (keys[num_keys].repl == NULL) 583 fatal("%s: NULL replacement", __func__); 584 } 585 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 586 fatal("%s: too many keys", __func__); 587 va_end(ap); 588 589 /* Expand string */ 590 *buf = '\0'; 591 for (i = 0; *string != '\0'; string++) { 592 if (*string != '%') { 593 append: 594 buf[i++] = *string; 595 if (i >= sizeof(buf)) 596 fatal("%s: string too long", __func__); 597 buf[i] = '\0'; 598 continue; 599 } 600 string++; 601 /* %% case */ 602 if (*string == '%') 603 goto append; 604 for (j = 0; j < num_keys; j++) { 605 if (strchr(keys[j].key, *string) != NULL) { 606 i = strlcat(buf, keys[j].repl, sizeof(buf)); 607 if (i >= sizeof(buf)) 608 fatal("%s: string too long", __func__); 609 break; 610 } 611 } 612 if (j >= num_keys) 613 fatal("%s: unknown key %%%c", __func__, *string); 614 } 615 return (xstrdup(buf)); 616 #undef EXPAND_MAX_KEYS 617 } 618 619 /* 620 * Read an entire line from a public key file into a static buffer, discarding 621 * lines that exceed the buffer size. Returns 0 on success, -1 on failure. 622 */ 623 int 624 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 625 u_long *lineno) 626 { 627 while (fgets(buf, bufsz, f) != NULL) { 628 if (buf[0] == '\0') 629 continue; 630 (*lineno)++; 631 if (buf[strlen(buf) - 1] == '\n' || feof(f)) { 632 return 0; 633 } else { 634 debug("%s: %s line %lu exceeds size limit", __func__, 635 filename, *lineno); 636 /* discard remainder of line */ 637 while (fgetc(f) != '\n' && !feof(f)) 638 ; /* nothing */ 639 } 640 } 641 return -1; 642 } 643 644 int 645 tun_open(int tun, int mode) 646 { 647 #if defined(CUSTOM_SYS_TUN_OPEN) 648 return (sys_tun_open(tun, mode)); 649 #elif defined(SSH_TUN_OPENBSD) 650 struct ifreq ifr; 651 char name[100]; 652 int fd = -1, sock; 653 654 /* Open the tunnel device */ 655 if (tun <= SSH_TUNID_MAX) { 656 snprintf(name, sizeof(name), "/dev/tun%d", tun); 657 fd = open(name, O_RDWR); 658 } else if (tun == SSH_TUNID_ANY) { 659 for (tun = 100; tun >= 0; tun--) { 660 snprintf(name, sizeof(name), "/dev/tun%d", tun); 661 if ((fd = open(name, O_RDWR)) >= 0) 662 break; 663 } 664 } else { 665 debug("%s: invalid tunnel %u", __func__, tun); 666 return (-1); 667 } 668 669 if (fd < 0) { 670 debug("%s: %s open failed: %s", __func__, name, strerror(errno)); 671 return (-1); 672 } 673 674 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 675 676 /* Set the tunnel device operation mode */ 677 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); 678 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 679 goto failed; 680 681 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) 682 goto failed; 683 684 /* Set interface mode */ 685 ifr.ifr_flags &= ~IFF_UP; 686 if (mode == SSH_TUNMODE_ETHERNET) 687 ifr.ifr_flags |= IFF_LINK0; 688 else 689 ifr.ifr_flags &= ~IFF_LINK0; 690 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) 691 goto failed; 692 693 /* Bring interface up */ 694 ifr.ifr_flags |= IFF_UP; 695 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) 696 goto failed; 697 698 close(sock); 699 return (fd); 700 701 failed: 702 if (fd >= 0) 703 close(fd); 704 if (sock >= 0) 705 close(sock); 706 debug("%s: failed to set %s mode %d: %s", __func__, name, 707 mode, strerror(errno)); 708 return (-1); 709 #else 710 error("Tunnel interfaces are not supported on this platform"); 711 return (-1); 712 #endif 713 } 714 715 void 716 sanitise_stdfd(void) 717 { 718 int nullfd, dupfd; 719 720 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 721 fprintf(stderr, "Couldn't open /dev/null: %s\n", 722 strerror(errno)); 723 exit(1); 724 } 725 while (++dupfd <= 2) { 726 /* Only clobber closed fds */ 727 if (fcntl(dupfd, F_GETFL, 0) >= 0) 728 continue; 729 if (dup2(nullfd, dupfd) == -1) { 730 fprintf(stderr, "dup2: %s\n", strerror(errno)); 731 exit(1); 732 } 733 } 734 if (nullfd > 2) 735 close(nullfd); 736 } 737 738 char * 739 tohex(const void *vp, size_t l) 740 { 741 const u_char *p = (const u_char *)vp; 742 char b[3], *r; 743 size_t i, hl; 744 745 if (l > 65536) 746 return xstrdup("tohex: length > 65536"); 747 748 hl = l * 2 + 1; 749 r = xcalloc(1, hl); 750 for (i = 0; i < l; i++) { 751 snprintf(b, sizeof(b), "%02x", p[i]); 752 strlcat(r, b, hl); 753 } 754 return (r); 755 } 756 757 u_int64_t 758 get_u64(const void *vp) 759 { 760 const u_char *p = (const u_char *)vp; 761 u_int64_t v; 762 763 v = (u_int64_t)p[0] << 56; 764 v |= (u_int64_t)p[1] << 48; 765 v |= (u_int64_t)p[2] << 40; 766 v |= (u_int64_t)p[3] << 32; 767 v |= (u_int64_t)p[4] << 24; 768 v |= (u_int64_t)p[5] << 16; 769 v |= (u_int64_t)p[6] << 8; 770 v |= (u_int64_t)p[7]; 771 772 return (v); 773 } 774 775 u_int32_t 776 get_u32(const void *vp) 777 { 778 const u_char *p = (const u_char *)vp; 779 u_int32_t v; 780 781 v = (u_int32_t)p[0] << 24; 782 v |= (u_int32_t)p[1] << 16; 783 v |= (u_int32_t)p[2] << 8; 784 v |= (u_int32_t)p[3]; 785 786 return (v); 787 } 788 789 u_int16_t 790 get_u16(const void *vp) 791 { 792 const u_char *p = (const u_char *)vp; 793 u_int16_t v; 794 795 v = (u_int16_t)p[0] << 8; 796 v |= (u_int16_t)p[1]; 797 798 return (v); 799 } 800 801 void 802 put_u64(void *vp, u_int64_t v) 803 { 804 u_char *p = (u_char *)vp; 805 806 p[0] = (u_char)(v >> 56) & 0xff; 807 p[1] = (u_char)(v >> 48) & 0xff; 808 p[2] = (u_char)(v >> 40) & 0xff; 809 p[3] = (u_char)(v >> 32) & 0xff; 810 p[4] = (u_char)(v >> 24) & 0xff; 811 p[5] = (u_char)(v >> 16) & 0xff; 812 p[6] = (u_char)(v >> 8) & 0xff; 813 p[7] = (u_char)v & 0xff; 814 } 815 816 void 817 put_u32(void *vp, u_int32_t v) 818 { 819 u_char *p = (u_char *)vp; 820 821 p[0] = (u_char)(v >> 24) & 0xff; 822 p[1] = (u_char)(v >> 16) & 0xff; 823 p[2] = (u_char)(v >> 8) & 0xff; 824 p[3] = (u_char)v & 0xff; 825 } 826 827 828 void 829 put_u16(void *vp, u_int16_t v) 830 { 831 u_char *p = (u_char *)vp; 832 833 p[0] = (u_char)(v >> 8) & 0xff; 834 p[1] = (u_char)v & 0xff; 835 } 836 837 void 838 ms_subtract_diff(struct timeval *start, int *ms) 839 { 840 struct timeval diff, finish; 841 842 gettimeofday(&finish, NULL); 843 timersub(&finish, start, &diff); 844 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 845 } 846 847 void 848 ms_to_timeval(struct timeval *tv, int ms) 849 { 850 if (ms < 0) 851 ms = 0; 852 tv->tv_sec = ms / 1000; 853 tv->tv_usec = (ms % 1000) * 1000; 854 } 855 856 void 857 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 858 { 859 bw->buflen = buflen; 860 bw->rate = kbps; 861 bw->thresh = bw->rate; 862 bw->lamt = 0; 863 timerclear(&bw->bwstart); 864 timerclear(&bw->bwend); 865 } 866 867 /* Callback from read/write loop to insert bandwidth-limiting delays */ 868 void 869 bandwidth_limit(struct bwlimit *bw, size_t read_len) 870 { 871 u_int64_t waitlen; 872 struct timespec ts, rm; 873 874 if (!timerisset(&bw->bwstart)) { 875 gettimeofday(&bw->bwstart, NULL); 876 return; 877 } 878 879 bw->lamt += read_len; 880 if (bw->lamt < bw->thresh) 881 return; 882 883 gettimeofday(&bw->bwend, NULL); 884 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 885 if (!timerisset(&bw->bwend)) 886 return; 887 888 bw->lamt *= 8; 889 waitlen = (double)1000000L * bw->lamt / bw->rate; 890 891 bw->bwstart.tv_sec = waitlen / 1000000L; 892 bw->bwstart.tv_usec = waitlen % 1000000L; 893 894 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 895 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 896 897 /* Adjust the wait time */ 898 if (bw->bwend.tv_sec) { 899 bw->thresh /= 2; 900 if (bw->thresh < bw->buflen / 4) 901 bw->thresh = bw->buflen / 4; 902 } else if (bw->bwend.tv_usec < 10000) { 903 bw->thresh *= 2; 904 if (bw->thresh > bw->buflen * 8) 905 bw->thresh = bw->buflen * 8; 906 } 907 908 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 909 while (nanosleep(&ts, &rm) == -1) { 910 if (errno != EINTR) 911 break; 912 ts = rm; 913 } 914 } 915 916 bw->lamt = 0; 917 gettimeofday(&bw->bwstart, NULL); 918 } 919 920 /* Make a template filename for mk[sd]temp() */ 921 void 922 mktemp_proto(char *s, size_t len) 923 { 924 const char *tmpdir; 925 int r; 926 927 if ((tmpdir = getenv("TMPDIR")) != NULL) { 928 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 929 if (r > 0 && (size_t)r < len) 930 return; 931 } 932 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 933 if (r < 0 || (size_t)r >= len) 934 fatal("%s: template string too short", __func__); 935 } 936 937 static const struct { 938 const char *name; 939 int value; 940 } ipqos[] = { 941 { "af11", IPTOS_DSCP_AF11 }, 942 { "af12", IPTOS_DSCP_AF12 }, 943 { "af13", IPTOS_DSCP_AF13 }, 944 { "af14", IPTOS_DSCP_AF21 }, 945 { "af22", IPTOS_DSCP_AF22 }, 946 { "af23", IPTOS_DSCP_AF23 }, 947 { "af31", IPTOS_DSCP_AF31 }, 948 { "af32", IPTOS_DSCP_AF32 }, 949 { "af33", IPTOS_DSCP_AF33 }, 950 { "af41", IPTOS_DSCP_AF41 }, 951 { "af42", IPTOS_DSCP_AF42 }, 952 { "af43", IPTOS_DSCP_AF43 }, 953 { "cs0", IPTOS_DSCP_CS0 }, 954 { "cs1", IPTOS_DSCP_CS1 }, 955 { "cs2", IPTOS_DSCP_CS2 }, 956 { "cs3", IPTOS_DSCP_CS3 }, 957 { "cs4", IPTOS_DSCP_CS4 }, 958 { "cs5", IPTOS_DSCP_CS5 }, 959 { "cs6", IPTOS_DSCP_CS6 }, 960 { "cs7", IPTOS_DSCP_CS7 }, 961 { "ef", IPTOS_DSCP_EF }, 962 { "lowdelay", IPTOS_LOWDELAY }, 963 { "throughput", IPTOS_THROUGHPUT }, 964 { "reliability", IPTOS_RELIABILITY }, 965 { NULL, -1 } 966 }; 967 968 int 969 parse_ipqos(const char *cp) 970 { 971 u_int i; 972 char *ep; 973 long val; 974 975 if (cp == NULL) 976 return -1; 977 for (i = 0; ipqos[i].name != NULL; i++) { 978 if (strcasecmp(cp, ipqos[i].name) == 0) 979 return ipqos[i].value; 980 } 981 /* Try parsing as an integer */ 982 val = strtol(cp, &ep, 0); 983 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 984 return -1; 985 return val; 986 } 987 988 const char * 989 iptos2str(int iptos) 990 { 991 int i; 992 static char iptos_str[sizeof "0xff"]; 993 994 for (i = 0; ipqos[i].name != NULL; i++) { 995 if (ipqos[i].value == iptos) 996 return ipqos[i].name; 997 } 998 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 999 return iptos_str; 1000 } 1001 void 1002 sock_set_v6only(int s) 1003 { 1004 #ifdef IPV6_V6ONLY 1005 int on = 1; 1006 1007 debug3("%s: set socket %d IPV6_V6ONLY", __func__, s); 1008 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) 1009 error("setsockopt IPV6_V6ONLY: %s", strerror(errno)); 1010 #endif 1011 } 1012