1 /* $OpenBSD: misc.c,v 1.110 2017/05/31 09:15:42 deraadt Exp $ */ 2 /* 3 * Copyright (c) 2000 Markus Friedl. All rights reserved. 4 * Copyright (c) 2005,2006 Damien Miller. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/types.h> 28 #include <sys/ioctl.h> 29 #include <sys/socket.h> 30 #include <sys/time.h> 31 #include <sys/un.h> 32 33 #include <net/if.h> 34 #include <netinet/in.h> 35 #include <netinet/ip.h> 36 #include <netinet/tcp.h> 37 38 #include <ctype.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <netdb.h> 42 #include <paths.h> 43 #include <pwd.h> 44 #include <limits.h> 45 #include <stdarg.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include "xmalloc.h" 52 #include "misc.h" 53 #include "log.h" 54 #include "ssh.h" 55 56 /* remove newline at end of string */ 57 char * 58 chop(char *s) 59 { 60 char *t = s; 61 while (*t) { 62 if (*t == '\n' || *t == '\r') { 63 *t = '\0'; 64 return s; 65 } 66 t++; 67 } 68 return s; 69 70 } 71 72 /* set/unset filedescriptor to non-blocking */ 73 int 74 set_nonblock(int fd) 75 { 76 int val; 77 78 val = fcntl(fd, F_GETFL); 79 if (val < 0) { 80 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 81 return (-1); 82 } 83 if (val & O_NONBLOCK) { 84 debug3("fd %d is O_NONBLOCK", fd); 85 return (0); 86 } 87 debug2("fd %d setting O_NONBLOCK", fd); 88 val |= O_NONBLOCK; 89 if (fcntl(fd, F_SETFL, val) == -1) { 90 debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd, 91 strerror(errno)); 92 return (-1); 93 } 94 return (0); 95 } 96 97 int 98 unset_nonblock(int fd) 99 { 100 int val; 101 102 val = fcntl(fd, F_GETFL); 103 if (val < 0) { 104 error("fcntl(%d, F_GETFL): %s", fd, strerror(errno)); 105 return (-1); 106 } 107 if (!(val & O_NONBLOCK)) { 108 debug3("fd %d is not O_NONBLOCK", fd); 109 return (0); 110 } 111 debug("fd %d clearing O_NONBLOCK", fd); 112 val &= ~O_NONBLOCK; 113 if (fcntl(fd, F_SETFL, val) == -1) { 114 debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s", 115 fd, strerror(errno)); 116 return (-1); 117 } 118 return (0); 119 } 120 121 const char * 122 ssh_gai_strerror(int gaierr) 123 { 124 if (gaierr == EAI_SYSTEM && errno != 0) 125 return strerror(errno); 126 return gai_strerror(gaierr); 127 } 128 129 /* disable nagle on socket */ 130 void 131 set_nodelay(int fd) 132 { 133 int opt; 134 socklen_t optlen; 135 136 optlen = sizeof opt; 137 if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) { 138 debug("getsockopt TCP_NODELAY: %.100s", strerror(errno)); 139 return; 140 } 141 if (opt == 1) { 142 debug2("fd %d is TCP_NODELAY", fd); 143 return; 144 } 145 opt = 1; 146 debug2("fd %d setting TCP_NODELAY", fd); 147 if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1) 148 error("setsockopt TCP_NODELAY: %.100s", strerror(errno)); 149 } 150 151 /* Characters considered whitespace in strsep calls. */ 152 #define WHITESPACE " \t\r\n" 153 #define QUOTE "\"" 154 155 /* return next token in configuration line */ 156 char * 157 strdelim(char **s) 158 { 159 char *old; 160 int wspace = 0; 161 162 if (*s == NULL) 163 return NULL; 164 165 old = *s; 166 167 *s = strpbrk(*s, WHITESPACE QUOTE "="); 168 if (*s == NULL) 169 return (old); 170 171 if (*s[0] == '\"') { 172 memmove(*s, *s + 1, strlen(*s)); /* move nul too */ 173 /* Find matching quote */ 174 if ((*s = strpbrk(*s, QUOTE)) == NULL) { 175 return (NULL); /* no matching quote */ 176 } else { 177 *s[0] = '\0'; 178 *s += strspn(*s + 1, WHITESPACE) + 1; 179 return (old); 180 } 181 } 182 183 /* Allow only one '=' to be skipped */ 184 if (*s[0] == '=') 185 wspace = 1; 186 *s[0] = '\0'; 187 188 /* Skip any extra whitespace after first token */ 189 *s += strspn(*s + 1, WHITESPACE) + 1; 190 if (*s[0] == '=' && !wspace) 191 *s += strspn(*s + 1, WHITESPACE) + 1; 192 193 return (old); 194 } 195 196 struct passwd * 197 pwcopy(struct passwd *pw) 198 { 199 struct passwd *copy = xcalloc(1, sizeof(*copy)); 200 201 copy->pw_name = xstrdup(pw->pw_name); 202 copy->pw_passwd = xstrdup(pw->pw_passwd); 203 copy->pw_gecos = xstrdup(pw->pw_gecos); 204 copy->pw_uid = pw->pw_uid; 205 copy->pw_gid = pw->pw_gid; 206 copy->pw_expire = pw->pw_expire; 207 copy->pw_change = pw->pw_change; 208 copy->pw_class = xstrdup(pw->pw_class); 209 copy->pw_dir = xstrdup(pw->pw_dir); 210 copy->pw_shell = xstrdup(pw->pw_shell); 211 return copy; 212 } 213 214 /* 215 * Convert ASCII string to TCP/IP port number. 216 * Port must be >=0 and <=65535. 217 * Return -1 if invalid. 218 */ 219 int 220 a2port(const char *s) 221 { 222 long long port; 223 const char *errstr; 224 225 port = strtonum(s, 0, 65535, &errstr); 226 if (errstr != NULL) 227 return -1; 228 return (int)port; 229 } 230 231 int 232 a2tun(const char *s, int *remote) 233 { 234 const char *errstr = NULL; 235 char *sp, *ep; 236 int tun; 237 238 if (remote != NULL) { 239 *remote = SSH_TUNID_ANY; 240 sp = xstrdup(s); 241 if ((ep = strchr(sp, ':')) == NULL) { 242 free(sp); 243 return (a2tun(s, NULL)); 244 } 245 ep[0] = '\0'; ep++; 246 *remote = a2tun(ep, NULL); 247 tun = a2tun(sp, NULL); 248 free(sp); 249 return (*remote == SSH_TUNID_ERR ? *remote : tun); 250 } 251 252 if (strcasecmp(s, "any") == 0) 253 return (SSH_TUNID_ANY); 254 255 tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr); 256 if (errstr != NULL) 257 return (SSH_TUNID_ERR); 258 259 return (tun); 260 } 261 262 #define SECONDS 1 263 #define MINUTES (SECONDS * 60) 264 #define HOURS (MINUTES * 60) 265 #define DAYS (HOURS * 24) 266 #define WEEKS (DAYS * 7) 267 268 /* 269 * Convert a time string into seconds; format is 270 * a sequence of: 271 * time[qualifier] 272 * 273 * Valid time qualifiers are: 274 * <none> seconds 275 * s|S seconds 276 * m|M minutes 277 * h|H hours 278 * d|D days 279 * w|W weeks 280 * 281 * Examples: 282 * 90m 90 minutes 283 * 1h30m 90 minutes 284 * 2d 2 days 285 * 1w 1 week 286 * 287 * Return -1 if time string is invalid. 288 */ 289 long 290 convtime(const char *s) 291 { 292 long total, secs, multiplier = 1; 293 const char *p; 294 char *endp; 295 296 errno = 0; 297 total = 0; 298 p = s; 299 300 if (p == NULL || *p == '\0') 301 return -1; 302 303 while (*p) { 304 secs = strtol(p, &endp, 10); 305 if (p == endp || 306 (errno == ERANGE && (secs == LONG_MIN || secs == LONG_MAX)) || 307 secs < 0) 308 return -1; 309 310 switch (*endp++) { 311 case '\0': 312 endp--; 313 break; 314 case 's': 315 case 'S': 316 break; 317 case 'm': 318 case 'M': 319 multiplier = MINUTES; 320 break; 321 case 'h': 322 case 'H': 323 multiplier = HOURS; 324 break; 325 case 'd': 326 case 'D': 327 multiplier = DAYS; 328 break; 329 case 'w': 330 case 'W': 331 multiplier = WEEKS; 332 break; 333 default: 334 return -1; 335 } 336 if (secs >= LONG_MAX / multiplier) 337 return -1; 338 secs *= multiplier; 339 if (total >= LONG_MAX - secs) 340 return -1; 341 total += secs; 342 if (total < 0) 343 return -1; 344 p = endp; 345 } 346 347 return total; 348 } 349 350 /* 351 * Returns a standardized host+port identifier string. 352 * Caller must free returned string. 353 */ 354 char * 355 put_host_port(const char *host, u_short port) 356 { 357 char *hoststr; 358 359 if (port == 0 || port == SSH_DEFAULT_PORT) 360 return(xstrdup(host)); 361 if (asprintf(&hoststr, "[%s]:%d", host, (int)port) < 0) 362 fatal("put_host_port: asprintf: %s", strerror(errno)); 363 debug3("put_host_port: %s", hoststr); 364 return hoststr; 365 } 366 367 /* 368 * Search for next delimiter between hostnames/addresses and ports. 369 * Argument may be modified (for termination). 370 * Returns *cp if parsing succeeds. 371 * *cp is set to the start of the next delimiter, if one was found. 372 * If this is the last field, *cp is set to NULL. 373 */ 374 char * 375 hpdelim(char **cp) 376 { 377 char *s, *old; 378 379 if (cp == NULL || *cp == NULL) 380 return NULL; 381 382 old = s = *cp; 383 if (*s == '[') { 384 if ((s = strchr(s, ']')) == NULL) 385 return NULL; 386 else 387 s++; 388 } else if ((s = strpbrk(s, ":/")) == NULL) 389 s = *cp + strlen(*cp); /* skip to end (see first case below) */ 390 391 switch (*s) { 392 case '\0': 393 *cp = NULL; /* no more fields*/ 394 break; 395 396 case ':': 397 case '/': 398 *s = '\0'; /* terminate */ 399 *cp = s + 1; 400 break; 401 402 default: 403 return NULL; 404 } 405 406 return old; 407 } 408 409 char * 410 cleanhostname(char *host) 411 { 412 if (*host == '[' && host[strlen(host) - 1] == ']') { 413 host[strlen(host) - 1] = '\0'; 414 return (host + 1); 415 } else 416 return host; 417 } 418 419 char * 420 colon(char *cp) 421 { 422 int flag = 0; 423 424 if (*cp == ':') /* Leading colon is part of file name. */ 425 return NULL; 426 if (*cp == '[') 427 flag = 1; 428 429 for (; *cp; ++cp) { 430 if (*cp == '@' && *(cp+1) == '[') 431 flag = 1; 432 if (*cp == ']' && *(cp+1) == ':' && flag) 433 return (cp+1); 434 if (*cp == ':' && !flag) 435 return (cp); 436 if (*cp == '/') 437 return NULL; 438 } 439 return NULL; 440 } 441 442 /* 443 * Parse a [user@]host[:port] string. 444 * Caller must free returned user and host. 445 * Any of the pointer return arguments may be NULL (useful for syntax checking). 446 * If user was not specified then *userp will be set to NULL. 447 * If port was not specified then *portp will be -1. 448 * Returns 0 on success, -1 on failure. 449 */ 450 int 451 parse_user_host_port(const char *s, char **userp, char **hostp, int *portp) 452 { 453 char *sdup, *cp, *tmp; 454 char *user = NULL, *host = NULL; 455 int port = -1, ret = -1; 456 457 if (userp != NULL) 458 *userp = NULL; 459 if (hostp != NULL) 460 *hostp = NULL; 461 if (portp != NULL) 462 *portp = -1; 463 464 if ((sdup = tmp = strdup(s)) == NULL) 465 return -1; 466 /* Extract optional username */ 467 if ((cp = strchr(tmp, '@')) != NULL) { 468 *cp = '\0'; 469 if (*tmp == '\0') 470 goto out; 471 if ((user = strdup(tmp)) == NULL) 472 goto out; 473 tmp = cp + 1; 474 } 475 /* Extract mandatory hostname */ 476 if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0') 477 goto out; 478 host = xstrdup(cleanhostname(cp)); 479 /* Convert and verify optional port */ 480 if (tmp != NULL && *tmp != '\0') { 481 if ((port = a2port(tmp)) <= 0) 482 goto out; 483 } 484 /* Success */ 485 if (userp != NULL) { 486 *userp = user; 487 user = NULL; 488 } 489 if (hostp != NULL) { 490 *hostp = host; 491 host = NULL; 492 } 493 if (portp != NULL) 494 *portp = port; 495 ret = 0; 496 out: 497 free(sdup); 498 free(user); 499 free(host); 500 return ret; 501 } 502 503 /* function to assist building execv() arguments */ 504 void 505 addargs(arglist *args, char *fmt, ...) 506 { 507 va_list ap; 508 char *cp; 509 u_int nalloc; 510 int r; 511 512 va_start(ap, fmt); 513 r = vasprintf(&cp, fmt, ap); 514 va_end(ap); 515 if (r == -1) 516 fatal("addargs: argument too long"); 517 518 nalloc = args->nalloc; 519 if (args->list == NULL) { 520 nalloc = 32; 521 args->num = 0; 522 } else if (args->num+2 >= nalloc) 523 nalloc *= 2; 524 525 args->list = xrecallocarray(args->list, args->nalloc, nalloc, sizeof(char *)); 526 args->nalloc = nalloc; 527 args->list[args->num++] = cp; 528 args->list[args->num] = NULL; 529 } 530 531 void 532 replacearg(arglist *args, u_int which, char *fmt, ...) 533 { 534 va_list ap; 535 char *cp; 536 int r; 537 538 va_start(ap, fmt); 539 r = vasprintf(&cp, fmt, ap); 540 va_end(ap); 541 if (r == -1) 542 fatal("replacearg: argument too long"); 543 544 if (which >= args->num) 545 fatal("replacearg: tried to replace invalid arg %d >= %d", 546 which, args->num); 547 free(args->list[which]); 548 args->list[which] = cp; 549 } 550 551 void 552 freeargs(arglist *args) 553 { 554 u_int i; 555 556 if (args->list != NULL) { 557 for (i = 0; i < args->num; i++) 558 free(args->list[i]); 559 free(args->list); 560 args->nalloc = args->num = 0; 561 args->list = NULL; 562 } 563 } 564 565 /* 566 * Expands tildes in the file name. Returns data allocated by xmalloc. 567 * Warning: this calls getpw*. 568 */ 569 char * 570 tilde_expand_filename(const char *filename, uid_t uid) 571 { 572 const char *path, *sep; 573 char user[128], *ret; 574 struct passwd *pw; 575 u_int len, slash; 576 577 if (*filename != '~') 578 return (xstrdup(filename)); 579 filename++; 580 581 path = strchr(filename, '/'); 582 if (path != NULL && path > filename) { /* ~user/path */ 583 slash = path - filename; 584 if (slash > sizeof(user) - 1) 585 fatal("tilde_expand_filename: ~username too long"); 586 memcpy(user, filename, slash); 587 user[slash] = '\0'; 588 if ((pw = getpwnam(user)) == NULL) 589 fatal("tilde_expand_filename: No such user %s", user); 590 } else if ((pw = getpwuid(uid)) == NULL) /* ~/path */ 591 fatal("tilde_expand_filename: No such uid %ld", (long)uid); 592 593 /* Make sure directory has a trailing '/' */ 594 len = strlen(pw->pw_dir); 595 if (len == 0 || pw->pw_dir[len - 1] != '/') 596 sep = "/"; 597 else 598 sep = ""; 599 600 /* Skip leading '/' from specified path */ 601 if (path != NULL) 602 filename = path + 1; 603 604 if (xasprintf(&ret, "%s%s%s", pw->pw_dir, sep, filename) >= PATH_MAX) 605 fatal("tilde_expand_filename: Path too long"); 606 607 return (ret); 608 } 609 610 /* 611 * Expand a string with a set of %[char] escapes. A number of escapes may be 612 * specified as (char *escape_chars, char *replacement) pairs. The list must 613 * be terminated by a NULL escape_char. Returns replaced string in memory 614 * allocated by xmalloc. 615 */ 616 char * 617 percent_expand(const char *string, ...) 618 { 619 #define EXPAND_MAX_KEYS 16 620 u_int num_keys, i, j; 621 struct { 622 const char *key; 623 const char *repl; 624 } keys[EXPAND_MAX_KEYS]; 625 char buf[4096]; 626 va_list ap; 627 628 /* Gather keys */ 629 va_start(ap, string); 630 for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) { 631 keys[num_keys].key = va_arg(ap, char *); 632 if (keys[num_keys].key == NULL) 633 break; 634 keys[num_keys].repl = va_arg(ap, char *); 635 if (keys[num_keys].repl == NULL) 636 fatal("%s: NULL replacement", __func__); 637 } 638 if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL) 639 fatal("%s: too many keys", __func__); 640 va_end(ap); 641 642 /* Expand string */ 643 *buf = '\0'; 644 for (i = 0; *string != '\0'; string++) { 645 if (*string != '%') { 646 append: 647 buf[i++] = *string; 648 if (i >= sizeof(buf)) 649 fatal("%s: string too long", __func__); 650 buf[i] = '\0'; 651 continue; 652 } 653 string++; 654 /* %% case */ 655 if (*string == '%') 656 goto append; 657 if (*string == '\0') 658 fatal("%s: invalid format", __func__); 659 for (j = 0; j < num_keys; j++) { 660 if (strchr(keys[j].key, *string) != NULL) { 661 i = strlcat(buf, keys[j].repl, sizeof(buf)); 662 if (i >= sizeof(buf)) 663 fatal("%s: string too long", __func__); 664 break; 665 } 666 } 667 if (j >= num_keys) 668 fatal("%s: unknown key %%%c", __func__, *string); 669 } 670 return (xstrdup(buf)); 671 #undef EXPAND_MAX_KEYS 672 } 673 674 /* 675 * Read an entire line from a public key file into a static buffer, discarding 676 * lines that exceed the buffer size. Returns 0 on success, -1 on failure. 677 */ 678 int 679 read_keyfile_line(FILE *f, const char *filename, char *buf, size_t bufsz, 680 u_long *lineno) 681 { 682 while (fgets(buf, bufsz, f) != NULL) { 683 if (buf[0] == '\0') 684 continue; 685 (*lineno)++; 686 if (buf[strlen(buf) - 1] == '\n' || feof(f)) { 687 return 0; 688 } else { 689 debug("%s: %s line %lu exceeds size limit", __func__, 690 filename, *lineno); 691 /* discard remainder of line */ 692 while (fgetc(f) != '\n' && !feof(f)) 693 ; /* nothing */ 694 } 695 } 696 return -1; 697 } 698 699 int 700 tun_open(int tun, int mode) 701 { 702 struct ifreq ifr; 703 char name[100]; 704 int fd = -1, sock; 705 const char *tunbase = "tun"; 706 707 if (mode == SSH_TUNMODE_ETHERNET) 708 tunbase = "tap"; 709 710 /* Open the tunnel device */ 711 if (tun <= SSH_TUNID_MAX) { 712 snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun); 713 fd = open(name, O_RDWR); 714 } else if (tun == SSH_TUNID_ANY) { 715 for (tun = 100; tun >= 0; tun--) { 716 snprintf(name, sizeof(name), "/dev/%s%d", 717 tunbase, tun); 718 if ((fd = open(name, O_RDWR)) >= 0) 719 break; 720 } 721 } else { 722 debug("%s: invalid tunnel %u", __func__, tun); 723 return -1; 724 } 725 726 if (fd < 0) { 727 debug("%s: %s open: %s", __func__, name, strerror(errno)); 728 return -1; 729 } 730 731 debug("%s: %s mode %d fd %d", __func__, name, mode, fd); 732 733 /* Bring interface up if it is not already */ 734 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun); 735 if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) 736 goto failed; 737 738 if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) { 739 debug("%s: get interface %s flags: %s", __func__, 740 ifr.ifr_name, strerror(errno)); 741 goto failed; 742 } 743 744 if (!(ifr.ifr_flags & IFF_UP)) { 745 ifr.ifr_flags |= IFF_UP; 746 if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) { 747 debug("%s: activate interface %s: %s", __func__, 748 ifr.ifr_name, strerror(errno)); 749 goto failed; 750 } 751 } 752 753 close(sock); 754 return fd; 755 756 failed: 757 if (fd >= 0) 758 close(fd); 759 if (sock >= 0) 760 close(sock); 761 return -1; 762 } 763 764 void 765 sanitise_stdfd(void) 766 { 767 int nullfd, dupfd; 768 769 if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 770 fprintf(stderr, "Couldn't open /dev/null: %s\n", 771 strerror(errno)); 772 exit(1); 773 } 774 while (++dupfd <= STDERR_FILENO) { 775 /* Only populate closed fds. */ 776 if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) { 777 if (dup2(nullfd, dupfd) == -1) { 778 fprintf(stderr, "dup2: %s\n", strerror(errno)); 779 exit(1); 780 } 781 } 782 } 783 if (nullfd > STDERR_FILENO) 784 close(nullfd); 785 } 786 787 char * 788 tohex(const void *vp, size_t l) 789 { 790 const u_char *p = (const u_char *)vp; 791 char b[3], *r; 792 size_t i, hl; 793 794 if (l > 65536) 795 return xstrdup("tohex: length > 65536"); 796 797 hl = l * 2 + 1; 798 r = xcalloc(1, hl); 799 for (i = 0; i < l; i++) { 800 snprintf(b, sizeof(b), "%02x", p[i]); 801 strlcat(r, b, hl); 802 } 803 return (r); 804 } 805 806 u_int64_t 807 get_u64(const void *vp) 808 { 809 const u_char *p = (const u_char *)vp; 810 u_int64_t v; 811 812 v = (u_int64_t)p[0] << 56; 813 v |= (u_int64_t)p[1] << 48; 814 v |= (u_int64_t)p[2] << 40; 815 v |= (u_int64_t)p[3] << 32; 816 v |= (u_int64_t)p[4] << 24; 817 v |= (u_int64_t)p[5] << 16; 818 v |= (u_int64_t)p[6] << 8; 819 v |= (u_int64_t)p[7]; 820 821 return (v); 822 } 823 824 u_int32_t 825 get_u32(const void *vp) 826 { 827 const u_char *p = (const u_char *)vp; 828 u_int32_t v; 829 830 v = (u_int32_t)p[0] << 24; 831 v |= (u_int32_t)p[1] << 16; 832 v |= (u_int32_t)p[2] << 8; 833 v |= (u_int32_t)p[3]; 834 835 return (v); 836 } 837 838 u_int32_t 839 get_u32_le(const void *vp) 840 { 841 const u_char *p = (const u_char *)vp; 842 u_int32_t v; 843 844 v = (u_int32_t)p[0]; 845 v |= (u_int32_t)p[1] << 8; 846 v |= (u_int32_t)p[2] << 16; 847 v |= (u_int32_t)p[3] << 24; 848 849 return (v); 850 } 851 852 u_int16_t 853 get_u16(const void *vp) 854 { 855 const u_char *p = (const u_char *)vp; 856 u_int16_t v; 857 858 v = (u_int16_t)p[0] << 8; 859 v |= (u_int16_t)p[1]; 860 861 return (v); 862 } 863 864 void 865 put_u64(void *vp, u_int64_t v) 866 { 867 u_char *p = (u_char *)vp; 868 869 p[0] = (u_char)(v >> 56) & 0xff; 870 p[1] = (u_char)(v >> 48) & 0xff; 871 p[2] = (u_char)(v >> 40) & 0xff; 872 p[3] = (u_char)(v >> 32) & 0xff; 873 p[4] = (u_char)(v >> 24) & 0xff; 874 p[5] = (u_char)(v >> 16) & 0xff; 875 p[6] = (u_char)(v >> 8) & 0xff; 876 p[7] = (u_char)v & 0xff; 877 } 878 879 void 880 put_u32(void *vp, u_int32_t v) 881 { 882 u_char *p = (u_char *)vp; 883 884 p[0] = (u_char)(v >> 24) & 0xff; 885 p[1] = (u_char)(v >> 16) & 0xff; 886 p[2] = (u_char)(v >> 8) & 0xff; 887 p[3] = (u_char)v & 0xff; 888 } 889 890 void 891 put_u32_le(void *vp, u_int32_t v) 892 { 893 u_char *p = (u_char *)vp; 894 895 p[0] = (u_char)v & 0xff; 896 p[1] = (u_char)(v >> 8) & 0xff; 897 p[2] = (u_char)(v >> 16) & 0xff; 898 p[3] = (u_char)(v >> 24) & 0xff; 899 } 900 901 void 902 put_u16(void *vp, u_int16_t v) 903 { 904 u_char *p = (u_char *)vp; 905 906 p[0] = (u_char)(v >> 8) & 0xff; 907 p[1] = (u_char)v & 0xff; 908 } 909 910 void 911 ms_subtract_diff(struct timeval *start, int *ms) 912 { 913 struct timeval diff, finish; 914 915 gettimeofday(&finish, NULL); 916 timersub(&finish, start, &diff); 917 *ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000); 918 } 919 920 void 921 ms_to_timeval(struct timeval *tv, int ms) 922 { 923 if (ms < 0) 924 ms = 0; 925 tv->tv_sec = ms / 1000; 926 tv->tv_usec = (ms % 1000) * 1000; 927 } 928 929 time_t 930 monotime(void) 931 { 932 struct timespec ts; 933 934 if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) 935 fatal("clock_gettime: %s", strerror(errno)); 936 937 return (ts.tv_sec); 938 } 939 940 double 941 monotime_double(void) 942 { 943 struct timespec ts; 944 945 if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) 946 fatal("clock_gettime: %s", strerror(errno)); 947 948 return (ts.tv_sec + (double)ts.tv_nsec / 1000000000); 949 } 950 951 void 952 bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen) 953 { 954 bw->buflen = buflen; 955 bw->rate = kbps; 956 bw->thresh = bw->rate; 957 bw->lamt = 0; 958 timerclear(&bw->bwstart); 959 timerclear(&bw->bwend); 960 } 961 962 /* Callback from read/write loop to insert bandwidth-limiting delays */ 963 void 964 bandwidth_limit(struct bwlimit *bw, size_t read_len) 965 { 966 u_int64_t waitlen; 967 struct timespec ts, rm; 968 969 if (!timerisset(&bw->bwstart)) { 970 gettimeofday(&bw->bwstart, NULL); 971 return; 972 } 973 974 bw->lamt += read_len; 975 if (bw->lamt < bw->thresh) 976 return; 977 978 gettimeofday(&bw->bwend, NULL); 979 timersub(&bw->bwend, &bw->bwstart, &bw->bwend); 980 if (!timerisset(&bw->bwend)) 981 return; 982 983 bw->lamt *= 8; 984 waitlen = (double)1000000L * bw->lamt / bw->rate; 985 986 bw->bwstart.tv_sec = waitlen / 1000000L; 987 bw->bwstart.tv_usec = waitlen % 1000000L; 988 989 if (timercmp(&bw->bwstart, &bw->bwend, >)) { 990 timersub(&bw->bwstart, &bw->bwend, &bw->bwend); 991 992 /* Adjust the wait time */ 993 if (bw->bwend.tv_sec) { 994 bw->thresh /= 2; 995 if (bw->thresh < bw->buflen / 4) 996 bw->thresh = bw->buflen / 4; 997 } else if (bw->bwend.tv_usec < 10000) { 998 bw->thresh *= 2; 999 if (bw->thresh > bw->buflen * 8) 1000 bw->thresh = bw->buflen * 8; 1001 } 1002 1003 TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts); 1004 while (nanosleep(&ts, &rm) == -1) { 1005 if (errno != EINTR) 1006 break; 1007 ts = rm; 1008 } 1009 } 1010 1011 bw->lamt = 0; 1012 gettimeofday(&bw->bwstart, NULL); 1013 } 1014 1015 /* Make a template filename for mk[sd]temp() */ 1016 void 1017 mktemp_proto(char *s, size_t len) 1018 { 1019 const char *tmpdir; 1020 int r; 1021 1022 if ((tmpdir = getenv("TMPDIR")) != NULL) { 1023 r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir); 1024 if (r > 0 && (size_t)r < len) 1025 return; 1026 } 1027 r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX"); 1028 if (r < 0 || (size_t)r >= len) 1029 fatal("%s: template string too short", __func__); 1030 } 1031 1032 static const struct { 1033 const char *name; 1034 int value; 1035 } ipqos[] = { 1036 { "af11", IPTOS_DSCP_AF11 }, 1037 { "af12", IPTOS_DSCP_AF12 }, 1038 { "af13", IPTOS_DSCP_AF13 }, 1039 { "af21", IPTOS_DSCP_AF21 }, 1040 { "af22", IPTOS_DSCP_AF22 }, 1041 { "af23", IPTOS_DSCP_AF23 }, 1042 { "af31", IPTOS_DSCP_AF31 }, 1043 { "af32", IPTOS_DSCP_AF32 }, 1044 { "af33", IPTOS_DSCP_AF33 }, 1045 { "af41", IPTOS_DSCP_AF41 }, 1046 { "af42", IPTOS_DSCP_AF42 }, 1047 { "af43", IPTOS_DSCP_AF43 }, 1048 { "cs0", IPTOS_DSCP_CS0 }, 1049 { "cs1", IPTOS_DSCP_CS1 }, 1050 { "cs2", IPTOS_DSCP_CS2 }, 1051 { "cs3", IPTOS_DSCP_CS3 }, 1052 { "cs4", IPTOS_DSCP_CS4 }, 1053 { "cs5", IPTOS_DSCP_CS5 }, 1054 { "cs6", IPTOS_DSCP_CS6 }, 1055 { "cs7", IPTOS_DSCP_CS7 }, 1056 { "ef", IPTOS_DSCP_EF }, 1057 { "lowdelay", IPTOS_LOWDELAY }, 1058 { "throughput", IPTOS_THROUGHPUT }, 1059 { "reliability", IPTOS_RELIABILITY }, 1060 { NULL, -1 } 1061 }; 1062 1063 int 1064 parse_ipqos(const char *cp) 1065 { 1066 u_int i; 1067 char *ep; 1068 long val; 1069 1070 if (cp == NULL) 1071 return -1; 1072 for (i = 0; ipqos[i].name != NULL; i++) { 1073 if (strcasecmp(cp, ipqos[i].name) == 0) 1074 return ipqos[i].value; 1075 } 1076 /* Try parsing as an integer */ 1077 val = strtol(cp, &ep, 0); 1078 if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255) 1079 return -1; 1080 return val; 1081 } 1082 1083 const char * 1084 iptos2str(int iptos) 1085 { 1086 int i; 1087 static char iptos_str[sizeof "0xff"]; 1088 1089 for (i = 0; ipqos[i].name != NULL; i++) { 1090 if (ipqos[i].value == iptos) 1091 return ipqos[i].name; 1092 } 1093 snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos); 1094 return iptos_str; 1095 } 1096 1097 void 1098 lowercase(char *s) 1099 { 1100 for (; *s; s++) 1101 *s = tolower((u_char)*s); 1102 } 1103 1104 int 1105 unix_listener(const char *path, int backlog, int unlink_first) 1106 { 1107 struct sockaddr_un sunaddr; 1108 int saved_errno, sock; 1109 1110 memset(&sunaddr, 0, sizeof(sunaddr)); 1111 sunaddr.sun_family = AF_UNIX; 1112 if (strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) { 1113 error("%s: \"%s\" too long for Unix domain socket", __func__, 1114 path); 1115 errno = ENAMETOOLONG; 1116 return -1; 1117 } 1118 1119 sock = socket(PF_UNIX, SOCK_STREAM, 0); 1120 if (sock < 0) { 1121 saved_errno = errno; 1122 error("socket: %.100s", strerror(errno)); 1123 errno = saved_errno; 1124 return -1; 1125 } 1126 if (unlink_first == 1) { 1127 if (unlink(path) != 0 && errno != ENOENT) 1128 error("unlink(%s): %.100s", path, strerror(errno)); 1129 } 1130 if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) { 1131 saved_errno = errno; 1132 error("bind: %.100s", strerror(errno)); 1133 close(sock); 1134 error("%s: cannot bind to path: %s", __func__, path); 1135 errno = saved_errno; 1136 return -1; 1137 } 1138 if (listen(sock, backlog) < 0) { 1139 saved_errno = errno; 1140 error("listen: %.100s", strerror(errno)); 1141 close(sock); 1142 unlink(path); 1143 error("%s: cannot listen on path: %s", __func__, path); 1144 errno = saved_errno; 1145 return -1; 1146 } 1147 return sock; 1148 } 1149 1150 /* 1151 * Compares two strings that maybe be NULL. Returns non-zero if strings 1152 * are both NULL or are identical, returns zero otherwise. 1153 */ 1154 static int 1155 strcmp_maybe_null(const char *a, const char *b) 1156 { 1157 if ((a == NULL && b != NULL) || (a != NULL && b == NULL)) 1158 return 0; 1159 if (a != NULL && strcmp(a, b) != 0) 1160 return 0; 1161 return 1; 1162 } 1163 1164 /* 1165 * Compare two forwards, returning non-zero if they are identical or 1166 * zero otherwise. 1167 */ 1168 int 1169 forward_equals(const struct Forward *a, const struct Forward *b) 1170 { 1171 if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0) 1172 return 0; 1173 if (a->listen_port != b->listen_port) 1174 return 0; 1175 if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0) 1176 return 0; 1177 if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0) 1178 return 0; 1179 if (a->connect_port != b->connect_port) 1180 return 0; 1181 if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0) 1182 return 0; 1183 /* allocated_port and handle are not checked */ 1184 return 1; 1185 } 1186 1187 /* returns 1 if bind to specified port by specified user is permitted */ 1188 int 1189 bind_permitted(int port, uid_t uid) 1190 { 1191 if (port < IPPORT_RESERVED && uid != 0) 1192 return 0; 1193 return 1; 1194 } 1195 1196 /* returns 1 if process is already daemonized, 0 otherwise */ 1197 int 1198 daemonized(void) 1199 { 1200 int fd; 1201 1202 if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) { 1203 close(fd); 1204 return 0; /* have controlling terminal */ 1205 } 1206 if (getppid() != 1) 1207 return 0; /* parent is not init */ 1208 if (getsid(0) != getpid()) 1209 return 0; /* not session leader */ 1210 debug3("already daemonized"); 1211 return 1; 1212 } 1213