1 /* $OpenBSD: misc.c,v 1.69 2008/06/13 01:38:23 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 <sys/types.h> 28 #include <sys/ioctl.h> 29 #include <sys/socket.h> 30 #include <sys/param.h> 31 32 #include <net/if.h> 33 #include <netinet/in.h> 34 #include <netinet/tcp.h> 35 36 #include <errno.h> 37 #include <fcntl.h> 38 #include <netdb.h> 39 #include <paths.h> 40 #include <pwd.h> 41 #include <stdarg.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "xmalloc.h" 48 #include "misc.h" 49 #include "log.h" 50 #include "ssh.h" 51 52 /* remove newline at end of string */ 53 char * 54 chop(char *s) 55 { 56 char *t = s; 57 while (*t) { 58 if (*t == '\n' || *t == '\r') { 59 *t = '\0'; 60 return s; 61 } 62 t++; 63 } 64 return s; 65 66 } 67 68 /* set/unset filedescriptor to non-blocking */ 69 int 70 set_nonblock(int fd) 71 { 72 int val; 73 74 val = fcntl(fd, F_GETFL, 0); 75 if (val < 0) { 76 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); 77 return (-1); 78 } 79 if (val & O_NONBLOCK) { 80 debug3("fd %d is O_NONBLOCK", fd); 81 return (0); 82 } 83 debug2("fd %d setting O_NONBLOCK", fd); 84 val |= O_NONBLOCK; 85 if (fcntl(fd, F_SETFL, val) == -1) { 86 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 87 strerror(errno)); 88 return (-1); 89 } 90 return (0); 91 } 92 93 int 94 unset_nonblock(int fd) 95 { 96 int val; 97 98 val = fcntl(fd, F_GETFL, 0); 99 if (val < 0) { 100 error("fcntl(%d, F_GETFL, 0): %s", fd, strerror(errno)); 101 return (-1); 102 } 103 if (!(val & O_NONBLOCK)) { 104 debug3("fd %d is not O_NONBLOCK", fd); 105 return (0); 106 } 107 debug("fd %d clearing O_NONBLOCK", fd); 108 val &= ~O_NONBLOCK; 109 if (fcntl(fd, F_SETFL, val) == -1) { 110 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 111 fd, strerror(errno)); 112 return (-1); 113 } 114 return (0); 115 } 116 117 const char * 118 ssh_gai_strerror(int gaierr) 119 { 120 if (gaierr == EAI_SYSTEM) 121 return strerror(errno); 122 return gai_strerror(gaierr); 123 } 124 125 /* disable nagle on socket */ 126 void 127 set_nodelay(int fd) 128 { 129 int opt; 130 socklen_t optlen; 131 132 optlen = sizeof opt; 133 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 134 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 135 return; 136 } 137 if (opt == 1) { 138 debug2("fd %d is TCP_NODELAY", fd); 139 return; 140 } 141 opt = 1; 142 debug2("fd %d setting TCP_NODELAY", fd); 143 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 144 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 145 } 146 147 /* Characters considered whitespace in strsep calls. */ 148 #define WHITESPACE " \t\r\n" 149 #define QUOTE "\"" 150 151 /* return next token in configuration line */ 152 char * 153 strdelim(char **s) 154 { 155 char *old; 156 int wspace = 0; 157 158 if (*s == NULL) 159 return NULL; 160 161 old = *s; 162 163 *s = strpbrk(*s, WHITESPACE QUOTE "="); 164 if (*s == NULL) 165 return (old); 166 167 if (*s[0] == '\"') { 168 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 169 /* Find matching quote */ 170 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 171 return (NULL); /* no matching quote */ 172 } else { 173 *s[0] = '\0'; 174 return (old); 175 } 176 } 177 178 /* Allow only one '=' to be skipped */ 179 if (*s[0] == '=') 180 wspace = 1; 181 *s[0] = '\0'; 182 183 /* Skip any extra whitespace after first token */ 184 *s += strspn(*s + 1, WHITESPACE) + 1; 185 if (*s[0] == '=' && !wspace) 186 *s += strspn(*s + 1, WHITESPACE) + 1; 187 188 return (old); 189 } 190 191 struct passwd * 192 pwcopy(struct passwd *pw) 193 { 194 struct passwd *copy = xcalloc(1, sizeof(*copy)); 195 196 copy->pw_name = xstrdup(pw->pw_name); 197 copy->pw_passwd = xstrdup(pw->pw_passwd); 198 copy->pw_gecos = xstrdup(pw->pw_gecos); 199 copy->pw_uid = pw->pw_uid; 200 copy->pw_gid = pw->pw_gid; 201 copy->pw_expire = pw->pw_expire; 202 copy->pw_change = pw->pw_change; 203 copy->pw_class = xstrdup(pw->pw_class); 204 copy->pw_dir = xstrdup(pw->pw_dir); 205 copy->pw_shell = xstrdup(pw->pw_shell); 206 return copy; 207 } 208 209 /* 210 * Convert ASCII string to TCP/IP port number. 211 * Port must be >0 and <=65535. 212 * Return 0 if invalid. 213 */ 214 int 215 a2port(const char *s) 216 { 217 long port; 218 char *endp; 219 220 errno = 0; 221 port = strtol(s, &endp, 0); 222 if (s == endp || *endp != '\0' || 223 (errno == ERANGE && (port == LONG_MIN || port == LONG_MAX)) || 224 port <= 0 || port > 65535) 225 return 0; 226 227 return port; 228 } 229 230 int 231 a2tun(const char *s, int *remote) 232 { 233 const char *errstr = NULL; 234 char *sp, *ep; 235 int tun; 236 237 if (remote != NULL) { 238 *remote = SSH_TUNID_ANY; 239 sp = xstrdup(s); 240 if ((ep = strchr(sp, ':')) == NULL) { 241 xfree(sp); 242 return (a2tun(s, NULL)); 243 } 244 ep[0] = '\0'; ep++; 245 *remote = a2tun(ep, NULL); 246 tun = a2tun(sp, NULL); 247 xfree(sp); 248 return (*remote == SSH_TUNID_ERR ? *remote : tun); 249 } 250 251 if (strcasecmp(s, "any") == 0) 252 return (SSH_TUNID_ANY); 253 254 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 255 if (errstr != NULL) 256 return (SSH_TUNID_ERR); 257 258 return (tun); 259 } 260 261 #define SECONDS 1 262 #define MINUTES (SECONDS * 60) 263 #define HOURS (MINUTES * 60) 264 #define DAYS (HOURS * 24) 265 #define WEEKS (DAYS * 7) 266 267 /* 268 * Convert a time string into seconds; format is 269 * a sequence of: 270 * time[qualifier] 271 * 272 * Valid time qualifiers are: 273 * <none> seconds 274 * s|S seconds 275 * m|M minutes 276 * h|H hours 277 * d|D days 278 * w|W weeks 279 * 280 * Examples: 281 * 90m 90 minutes 282 * 1h30m 90 minutes 283 * 2d 2 days 284 * 1w 1 week 285 * 286 * Return -1 if time string is invalid. 287 */ 288 long 289 convtime(const char *s) 290 { 291 long total, secs; 292 const char *p; 293 char *endp; 294 295 errno = 0; 296 total = 0; 297 p = s; 298 299 if (p == NULL || *p == '\0') 300 return -1; 301 302 while (*p) { 303 secs = strtol(p, &endp, 10); 304 if (p == endp || 305 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || 306 secs < 0) 307 return -1; 308 309 switch (*endp++) { 310 case '\0': 311 endp--; 312 break; 313 case 's': 314 case 'S': 315 break; 316 case 'm': 317 case 'M': 318 secs *= MINUTES; 319 break; 320 case 'h': 321 case 'H': 322 secs *= HOURS; 323 break; 324 case 'd': 325 case 'D': 326 secs *= DAYS; 327 break; 328 case 'w': 329 case 'W': 330 secs *= WEEKS; 331 break; 332 default: 333 return -1; 334 } 335 total += secs; 336 if (total < 0) 337 return -1; 338 p = endp; 339 } 340 341 return total; 342 } 343 344 /* 345 * Returns a standardized host+port identifier string. 346 * Caller must free returned string. 347 */ 348 char * 349 put_host_port(const char *host, u_short port) 350 { 351 char *hoststr; 352 353 if (port == 0 || port == SSH_DEFAULT_PORT) 354 return(xstrdup(host)); 355 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) 356 fatal("put_host_port: asprintf: %s", strerror(errno)); 357 debug3("put_host_port: %s", hoststr); 358 return hoststr; 359 } 360 361 /* 362 * Search for next delimiter between hostnames/addresses and ports. 363 * Argument may be modified (for termination). 364 * Returns *cp if parsing succeeds. 365 * *cp is set to the start of the next delimiter, if one was found. 366 * If this is the last field, *cp is set to NULL. 367 */ 368 char * 369 hpdelim(char **cp) 370 { 371 char *s, *old; 372 373 if (cp == NULL || *cp == NULL) 374 return NULL; 375 376 old = s = *cp; 377 if (*s == '[') { 378 if ((s = strchr(s, ']')) == NULL) 379 return NULL; 380 else 381 s++; 382 } else if ((s = strpbrk(s, ":/")) == NULL) 383 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 384 385 switch (*s) { 386 case '\0': 387 *cp = NULL; /* no more fields*/ 388 break; 389 390 case ':': 391 case '/': 392 *s = '\0'; /* terminate */ 393 *cp = s + 1; 394 break; 395 396 default: 397 return NULL; 398 } 399 400 return old; 401 } 402 403 char * 404 cleanhostname(char *host) 405 { 406 if (*host == '[' && host[strlen(host) - 1] == ']') { 407 host[strlen(host) - 1] = '\0'; 408 return (host + 1); 409 } else 410 return host; 411 } 412 413 char * 414 colon(char *cp) 415 { 416 int flag = 0; 417 418 if (*cp == ':') /* Leading colon is part of file name. */ 419 return (0); 420 if (*cp == '[') 421 flag = 1; 422 423 for (; *cp; ++cp) { 424 if (*cp == '@' && *(cp+1) == '[') 425 flag = 1; 426 if (*cp == ']' && *(cp+1) == ':' && flag) 427 return (cp+1); 428 if (*cp == ':' && !flag) 429 return (cp); 430 if (*cp == '/') 431 return (0); 432 } 433 return (0); 434 } 435 436 /* function to assist building execv() arguments */ 437 void 438 addargs(arglist *args, char *fmt, ...) 439 { 440 va_list ap; 441 char *cp; 442 u_int nalloc; 443 int r; 444 445 va_start(ap, fmt); 446 r = vasprintf(&cp, fmt, ap); 447 va_end(ap); 448 if (r == -1) 449 fatal("addargs: argument too long"); 450 451 nalloc = args->nalloc; 452 if (args->list == NULL) { 453 nalloc = 32; 454 args->num = 0; 455 } else if (args->num+2 >= nalloc) 456 nalloc *= 2; 457 458 args->list = xrealloc(args->list, nalloc, sizeof(char *)); 459 args->nalloc = nalloc; 460 args->list[args->num++] = cp; 461 args->list[args->num] = NULL; 462 } 463 464 void 465 replacearg(arglist *args, u_int which, char *fmt, ...) 466 { 467 va_list ap; 468 char *cp; 469 int r; 470 471 va_start(ap, fmt); 472 r = vasprintf(&cp, fmt, ap); 473 va_end(ap); 474 if (r == -1) 475 fatal("replacearg: argument too long"); 476 477 if (which >= args->num) 478 fatal("replacearg: tried to replace invalid arg %d >= %d", 479 which, args->num); 480 xfree(args->list[which]); 481 args->list[which] = cp; 482 } 483 484 void 485 freeargs(arglist *args) 486 { 487 u_int i; 488 489 if (args->list != NULL) { 490 for (i = 0; i < args->num; i++) 491 xfree(args->list[i]); 492 xfree(args->list); 493 args->nalloc = args->num = 0; 494 args->list = NULL; 495 } 496 } 497 498 /* 499 * Expands tildes in the file name. Returns data allocated by xmalloc. 500 * Warning: this calls getpw*. 501 */ 502 char * 503 tilde_expand_filename(const char *filename, uid_t uid) 504 { 505 const char *path; 506 char user[128], ret[MAXPATHLEN]; 507 struct passwd *pw; 508 u_int len, slash; 509 510 if (*filename != '~') 511 return (xstrdup(filename)); 512 filename++; 513 514 path = strchr(filename, '/'); 515 if (path != NULL && path > filename) { /* ~user/path */ 516 slash = path - filename; 517 if (slash > sizeof(user) - 1) 518 fatal("tilde_expand_filename: ~username too long"); 519 memcpy(user, filename, slash); 520 user[slash] = '\0'; 521 if ((pw = getpwnam(user)) == NULL) 522 fatal("tilde_expand_filename: No such user %s", user); 523 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 524 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 525 526 if (strlcpy(ret, pw->pw_dir, sizeof(ret)) >= sizeof(ret)) 527 fatal("tilde_expand_filename: Path too long"); 528 529 /* Make sure directory has a trailing '/' */ 530 len = strlen(pw->pw_dir); 531 if ((len == 0 || pw->pw_dir[len - 1] != '/') && 532 strlcat(ret, "/", sizeof(ret)) >= sizeof(ret)) 533 fatal("tilde_expand_filename: Path too long"); 534 535 /* Skip leading '/' from specified path */ 536 if (path != NULL) 537 filename = path + 1; 538 if (strlcat(ret, filename, sizeof(ret)) >= sizeof(ret)) 539 fatal("tilde_expand_filename: Path too long"); 540 541 return (xstrdup(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 struct { 555 const char *key; 556 const char *repl; 557 } keys[EXPAND_MAX_KEYS]; 558 u_int num_keys, i, j; 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("percent_expand: NULL replacement"); 571 } 572 va_end(ap); 573 574 if (num_keys >= EXPAND_MAX_KEYS) 575 fatal("percent_expand: too many keys"); 576 577 /* Expand string */ 578 *buf = '\0'; 579 for (i = 0; *string != '\0'; string++) { 580 if (*string != '%') { 581 append: 582 buf[i++] = *string; 583 if (i >= sizeof(buf)) 584 fatal("percent_expand: string too long"); 585 buf[i] = '\0'; 586 continue; 587 } 588 string++; 589 if (*string == '%') 590 goto append; 591 for (j = 0; j < num_keys; j++) { 592 if (strchr(keys[j].key, *string) != NULL) { 593 i = strlcat(buf, keys[j].repl, sizeof(buf)); 594 if (i >= sizeof(buf)) 595 fatal("percent_expand: string too long"); 596 break; 597 } 598 } 599 if (j >= num_keys) 600 fatal("percent_expand: unknown key %%%c", *string); 601 } 602 return (xstrdup(buf)); 603 #undef EXPAND_MAX_KEYS 604 } 605 606 /* 607 * Read an entire line from a public key file into a static buffer, discarding 608 * lines that exceed the buffer size. Returns 0 on success, -1 on failure. 609 */ 610 int 611 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 612 u_long *lineno) 613 { 614 while (fgets(buf, bufsz, f) != NULL) { 615 if (buf[0] == '\0') 616 continue; 617 (*lineno)++; 618 if (buf[strlen(buf) - 1] == '\n' || feof(f)) { 619 return 0; 620 } else { 621 debug("%s: %s line %lu exceeds size limit", __func__, 622 filename, *lineno); 623 /* discard remainder of line */ 624 while (fgetc(f) != '\n' && !feof(f)) 625 ; /* nothing */ 626 } 627 } 628 return -1; 629 } 630 631 int 632 tun_open(int tun, int mode) 633 { 634 struct ifreq ifr; 635 char name[100]; 636 int fd = -1, sock; 637 638 /* Open the tunnel device */ 639 if (tun <= SSH_TUNID_MAX) { 640 snprintf(name, sizeof(name), "/dev/tun%d", tun); 641 fd = open(name, O_RDWR); 642 } else if (tun == SSH_TUNID_ANY) { 643 for (tun = 100; tun >= 0; tun--) { 644 snprintf(name, sizeof(name), "/dev/tun%d", tun); 645 if ((fd = open(name, O_RDWR)) >= 0) 646 break; 647 } 648 } else { 649 debug("%s: invalid tunnel %u", __func__, tun); 650 return (-1); 651 } 652 653 if (fd < 0) { 654 debug("%s: %s open failed: %s", __func__, name, strerror(errno)); 655 return (-1); 656 } 657 658 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 659 660 /* Set the tunnel device operation mode */ 661 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "tun%d", tun); 662 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 663 goto failed; 664 665 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) 666 goto failed; 667 668 /* Set interface mode */ 669 ifr.ifr_flags &= ~IFF_UP; 670 if (mode == SSH_TUNMODE_ETHERNET) 671 ifr.ifr_flags |= IFF_LINK0; 672 else 673 ifr.ifr_flags &= ~IFF_LINK0; 674 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) 675 goto failed; 676 677 /* Bring interface up */ 678 ifr.ifr_flags |= IFF_UP; 679 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) 680 goto failed; 681 682 close(sock); 683 return (fd); 684 685 failed: 686 if (fd >= 0) 687 close(fd); 688 if (sock >= 0) 689 close(sock); 690 debug("%s: failed to set %s mode %d: %s", __func__, name, 691 mode, strerror(errno)); 692 return (-1); 693 } 694 695 void 696 sanitise_stdfd(void) 697 { 698 int nullfd, dupfd; 699 700 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 701 fprintf(stderr, "Couldn't open /dev/null: %s", strerror(errno)); 702 exit(1); 703 } 704 while (++dupfd <= 2) { 705 /* Only clobber closed fds */ 706 if (fcntl(dupfd, F_GETFL, 0) >= 0) 707 continue; 708 if (dup2(nullfd, dupfd) == -1) { 709 fprintf(stderr, "dup2: %s", strerror(errno)); 710 exit(1); 711 } 712 } 713 if (nullfd > 2) 714 close(nullfd); 715 } 716 717 char * 718 tohex(const void *vp, size_t l) 719 { 720 const u_char *p = (const u_char *)vp; 721 char b[3], *r; 722 size_t i, hl; 723 724 if (l > 65536) 725 return xstrdup("tohex: length > 65536"); 726 727 hl = l * 2 + 1; 728 r = xcalloc(1, hl); 729 for (i = 0; i < l; i++) { 730 snprintf(b, sizeof(b), "%02x", p[i]); 731 strlcat(r, b, hl); 732 } 733 return (r); 734 } 735 736 u_int64_t 737 get_u64(const void *vp) 738 { 739 const u_char *p = (const u_char *)vp; 740 u_int64_t v; 741 742 v = (u_int64_t)p[0] << 56; 743 v |= (u_int64_t)p[1] << 48; 744 v |= (u_int64_t)p[2] << 40; 745 v |= (u_int64_t)p[3] << 32; 746 v |= (u_int64_t)p[4] << 24; 747 v |= (u_int64_t)p[5] << 16; 748 v |= (u_int64_t)p[6] << 8; 749 v |= (u_int64_t)p[7]; 750 751 return (v); 752 } 753 754 u_int32_t 755 get_u32(const void *vp) 756 { 757 const u_char *p = (const u_char *)vp; 758 u_int32_t v; 759 760 v = (u_int32_t)p[0] << 24; 761 v |= (u_int32_t)p[1] << 16; 762 v |= (u_int32_t)p[2] << 8; 763 v |= (u_int32_t)p[3]; 764 765 return (v); 766 } 767 768 u_int16_t 769 get_u16(const void *vp) 770 { 771 const u_char *p = (const u_char *)vp; 772 u_int16_t v; 773 774 v = (u_int16_t)p[0] << 8; 775 v |= (u_int16_t)p[1]; 776 777 return (v); 778 } 779 780 void 781 put_u64(void *vp, u_int64_t v) 782 { 783 u_char *p = (u_char *)vp; 784 785 p[0] = (u_char)(v >> 56) & 0xff; 786 p[1] = (u_char)(v >> 48) & 0xff; 787 p[2] = (u_char)(v >> 40) & 0xff; 788 p[3] = (u_char)(v >> 32) & 0xff; 789 p[4] = (u_char)(v >> 24) & 0xff; 790 p[5] = (u_char)(v >> 16) & 0xff; 791 p[6] = (u_char)(v >> 8) & 0xff; 792 p[7] = (u_char)v & 0xff; 793 } 794 795 void 796 put_u32(void *vp, u_int32_t v) 797 { 798 u_char *p = (u_char *)vp; 799 800 p[0] = (u_char)(v >> 24) & 0xff; 801 p[1] = (u_char)(v >> 16) & 0xff; 802 p[2] = (u_char)(v >> 8) & 0xff; 803 p[3] = (u_char)v & 0xff; 804 } 805 806 807 void 808 put_u16(void *vp, u_int16_t v) 809 { 810 u_char *p = (u_char *)vp; 811 812 p[0] = (u_char)(v >> 8) & 0xff; 813 p[1] = (u_char)v & 0xff; 814 } 815 816 void 817 ms_subtract_diff(struct timeval *start, int *ms) 818 { 819 struct timeval diff, finish; 820 821 gettimeofday(&finish, NULL); 822 timersub(&finish, start, &diff); 823 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 824 } 825 826 void 827 ms_to_timeval(struct timeval *tv, int ms) 828 { 829 if (ms < 0) 830 ms = 0; 831 tv->tv_sec = ms / 1000; 832 tv->tv_usec = (ms % 1000) * 1000; 833 } 834 835