utils.c revision 6644900d2116a2a397bf0ed26ffd845ca2136b52
1/* 2 * utils.c 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 10 * 11 */ 12 13#include <stdio.h> 14#include <stdlib.h> 15#include <unistd.h> 16#include <syslog.h> 17#include <fcntl.h> 18#include <sys/socket.h> 19#include <netinet/in.h> 20#include <string.h> 21#include <netdb.h> 22#include <arpa/inet.h> 23#include <resolv.h> 24#include <asm/types.h> 25#include <linux/pkt_sched.h> 26#include <time.h> 27#include <sys/time.h> 28#include <errno.h> 29 30 31#include "utils.h" 32 33int get_integer(int *val, const char *arg, int base) 34{ 35 long res; 36 char *ptr; 37 38 if (!arg || !*arg) 39 return -1; 40 res = strtol(arg, &ptr, base); 41 if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN) 42 return -1; 43 *val = res; 44 return 0; 45} 46 47int mask2bits(__u32 netmask) 48{ 49 unsigned bits = 0; 50 __u32 mask = ntohl(netmask); 51 __u32 host = ~mask; 52 53 /* a valid netmask must be 2^n - 1 */ 54 if ((host & (host + 1)) != 0) 55 return -1; 56 57 for (; mask; mask <<= 1) 58 ++bits; 59 return bits; 60} 61 62static int get_netmask(unsigned *val, const char *arg, int base) 63{ 64 inet_prefix addr; 65 66 if (!get_unsigned(val, arg, base)) 67 return 0; 68 69 /* try coverting dotted quad to CIDR */ 70 if (!get_addr_1(&addr, arg, AF_INET) && addr.family == AF_INET) { 71 int b = mask2bits(addr.data[0]); 72 73 if (b >= 0) { 74 *val = b; 75 return 0; 76 } 77 } 78 79 return -1; 80} 81 82int get_unsigned(unsigned *val, const char *arg, int base) 83{ 84 unsigned long res; 85 char *ptr; 86 87 if (!arg || !*arg) 88 return -1; 89 res = strtoul(arg, &ptr, base); 90 if (!ptr || ptr == arg || *ptr || res > UINT_MAX) 91 return -1; 92 *val = res; 93 return 0; 94} 95 96/* 97 * get_time_rtt is "translated" from a similar routine "get_time" in 98 * tc_util.c. We don't use the exact same routine because tc passes 99 * microseconds to the kernel and the callers of get_time_rtt want to 100 * pass milliseconds (standard unit for rtt values since 2.6.27), and 101 * have a different assumption for the units of a "raw" number. 102 */ 103int get_time_rtt(unsigned *val, const char *arg, int *raw) 104{ 105 double t; 106 unsigned long res; 107 char *p; 108 109 if (strchr(arg,'.') != NULL) { 110 t = strtod(arg,&p); 111 if (t < 0.0) 112 return -1; 113 } 114 else { 115 res = strtoul(arg, &p, 0); 116 if (res > UINT_MAX) 117 return -1; 118 t = (double)res; 119 } 120 if (p == arg) 121 return -1; 122 *raw = 1; 123 124 if (*p) { 125 *raw = 0; 126 if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 || 127 strcasecmp(p, "secs")==0) 128 t *= 1000; 129 else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 || 130 strcasecmp(p, "msecs") == 0) 131 t *= 1.0; /* allow suffix, do nothing */ 132 else 133 return -1; 134 } 135 136 /* emulate ceil() without having to bring-in -lm and always be >= 1 */ 137 138 *val = t; 139 if (*val < t) 140 *val += 1; 141 142 return 0; 143 144} 145 146int get_u64(__u64 *val, const char *arg, int base) 147{ 148 unsigned long long res; 149 char *ptr; 150 151 if (!arg || !*arg) 152 return -1; 153 res = strtoull(arg, &ptr, base); 154 if (!ptr || ptr == arg || *ptr || res == 0xFFFFFFFFULL) 155 return -1; 156 *val = res; 157 return 0; 158} 159 160int get_u32(__u32 *val, const char *arg, int base) 161{ 162 unsigned long res; 163 char *ptr; 164 165 if (!arg || !*arg) 166 return -1; 167 res = strtoul(arg, &ptr, base); 168 if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL) 169 return -1; 170 *val = res; 171 return 0; 172} 173 174int get_u16(__u16 *val, const char *arg, int base) 175{ 176 unsigned long res; 177 char *ptr; 178 179 if (!arg || !*arg) 180 return -1; 181 res = strtoul(arg, &ptr, base); 182 if (!ptr || ptr == arg || *ptr || res > 0xFFFF) 183 return -1; 184 *val = res; 185 return 0; 186} 187 188int get_u8(__u8 *val, const char *arg, int base) 189{ 190 unsigned long res; 191 char *ptr; 192 193 if (!arg || !*arg) 194 return -1; 195 res = strtoul(arg, &ptr, base); 196 if (!ptr || ptr == arg || *ptr || res > 0xFF) 197 return -1; 198 *val = res; 199 return 0; 200} 201 202int get_s32(__s32 *val, const char *arg, int base) 203{ 204 long res; 205 char *ptr; 206 207 errno = 0; 208 209 if (!arg || !*arg) 210 return -1; 211 res = strtol(arg, &ptr, base); 212 if (ptr == arg || *ptr || 213 ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE) || 214 res > INT32_MAX || res < INT32_MIN) 215 return -1; 216 *val = res; 217 return 0; 218} 219 220int get_s16(__s16 *val, const char *arg, int base) 221{ 222 long res; 223 char *ptr; 224 225 if (!arg || !*arg) 226 return -1; 227 res = strtol(arg, &ptr, base); 228 if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000) 229 return -1; 230 *val = res; 231 return 0; 232} 233 234int get_s8(__s8 *val, const char *arg, int base) 235{ 236 long res; 237 char *ptr; 238 239 if (!arg || !*arg) 240 return -1; 241 res = strtol(arg, &ptr, base); 242 if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80) 243 return -1; 244 *val = res; 245 return 0; 246} 247 248/* This uses a non-standard parsing (ie not inet_aton, or inet_pton) 249 * because of legacy choice to parse 10.8 as 10.8.0.0 not 10.0.0.8 250 */ 251static int get_addr_ipv4(__u8 *ap, const char *cp) 252{ 253 int i; 254 255 for (i = 0; i < 4; i++) { 256 unsigned long n; 257 char *endp; 258 259 n = strtoul(cp, &endp, 0); 260 if (n > 255) 261 return -1; /* bogus network value */ 262 263 if (endp == cp) /* no digits */ 264 return -1; 265 266 ap[i] = n; 267 268 if (*endp == '\0') 269 break; 270 271 if (i == 3 || *endp != '.') 272 return -1; /* extra characters */ 273 cp = endp + 1; 274 } 275 276 return 1; 277} 278 279int get_addr_1(inet_prefix *addr, const char *name, int family) 280{ 281 memset(addr, 0, sizeof(*addr)); 282 283 if (strcmp(name, "default") == 0 || 284 strcmp(name, "all") == 0 || 285 strcmp(name, "any") == 0) { 286 if (family == AF_DECnet) 287 return -1; 288 addr->family = family; 289 addr->bytelen = (family == AF_INET6 ? 16 : 4); 290 addr->bitlen = -1; 291 return 0; 292 } 293 294 if (strchr(name, ':')) { 295 addr->family = AF_INET6; 296 if (family != AF_UNSPEC && family != AF_INET6) 297 return -1; 298 if (inet_pton(AF_INET6, name, addr->data) <= 0) 299 return -1; 300 addr->bytelen = 16; 301 addr->bitlen = -1; 302 return 0; 303 } 304 305#ifndef ANDROID 306 if (family == AF_DECnet) { 307 struct dn_naddr dna; 308 addr->family = AF_DECnet; 309 if (dnet_pton(AF_DECnet, name, &dna) <= 0) 310 return -1; 311 memcpy(addr->data, dna.a_addr, 2); 312 addr->bytelen = 2; 313 addr->bitlen = -1; 314 return 0; 315 } 316#endif 317 318 addr->family = AF_INET; 319 if (family != AF_UNSPEC && family != AF_INET) 320 return -1; 321 322 if (get_addr_ipv4((__u8 *)addr->data, name) <= 0) 323 return -1; 324 325 addr->bytelen = 4; 326 addr->bitlen = -1; 327 return 0; 328} 329 330int get_prefix_1(inet_prefix *dst, char *arg, int family) 331{ 332 int err; 333 unsigned plen; 334 char *slash; 335 336 memset(dst, 0, sizeof(*dst)); 337 338 if (strcmp(arg, "default") == 0 || 339 strcmp(arg, "any") == 0 || 340 strcmp(arg, "all") == 0) { 341 if (family == AF_DECnet) 342 return -1; 343 dst->family = family; 344 dst->bytelen = 0; 345 dst->bitlen = 0; 346 return 0; 347 } 348 349 slash = strchr(arg, '/'); 350 if (slash) 351 *slash = 0; 352 353 err = get_addr_1(dst, arg, family); 354 if (err == 0) { 355 switch(dst->family) { 356 case AF_INET6: 357 dst->bitlen = 128; 358 break; 359 case AF_DECnet: 360 dst->bitlen = 16; 361 break; 362 default: 363 case AF_INET: 364 dst->bitlen = 32; 365 } 366 if (slash) { 367 if (get_netmask(&plen, slash+1, 0) 368 || plen > dst->bitlen) { 369 err = -1; 370 goto done; 371 } 372 dst->flags |= PREFIXLEN_SPECIFIED; 373 dst->bitlen = plen; 374 } 375 } 376done: 377 if (slash) 378 *slash = '/'; 379 return err; 380} 381 382int get_addr(inet_prefix *dst, const char *arg, int family) 383{ 384 if (family == AF_PACKET) { 385 fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg); 386 exit(1); 387 } 388 if (get_addr_1(dst, arg, family)) { 389 fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg); 390 exit(1); 391 } 392 return 0; 393} 394 395int get_prefix(inet_prefix *dst, char *arg, int family) 396{ 397 if (family == AF_PACKET) { 398 fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg); 399 exit(1); 400 } 401 if (get_prefix_1(dst, arg, family)) { 402 fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg); 403 exit(1); 404 } 405 return 0; 406} 407 408__u32 get_addr32(const char *name) 409{ 410 inet_prefix addr; 411 if (get_addr_1(&addr, name, AF_INET)) { 412 fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name); 413 exit(1); 414 } 415 return addr.data[0]; 416} 417 418void incomplete_command(void) 419{ 420 fprintf(stderr, "Command line is not complete. Try option \"help\"\n"); 421 exit(-1); 422} 423 424void missarg(const char *key) 425{ 426 fprintf(stderr, "Error: argument \"%s\" is required\n", key); 427 exit(-1); 428} 429 430void invarg(const char *msg, const char *arg) 431{ 432 fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg); 433 exit(-1); 434} 435 436void duparg(const char *key, const char *arg) 437{ 438 fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg); 439 exit(-1); 440} 441 442void duparg2(const char *key, const char *arg) 443{ 444 fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg); 445 exit(-1); 446} 447 448int matches(const char *cmd, const char *pattern) 449{ 450 int len = strlen(cmd); 451 if (len > strlen(pattern)) 452 return -1; 453 return memcmp(pattern, cmd, len); 454} 455 456int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits) 457{ 458 const __u32 *a1 = a->data; 459 const __u32 *a2 = b->data; 460 int words = bits >> 0x05; 461 462 bits &= 0x1f; 463 464 if (words) 465 if (memcmp(a1, a2, words << 2)) 466 return -1; 467 468 if (bits) { 469 __u32 w1, w2; 470 __u32 mask; 471 472 w1 = a1[words]; 473 w2 = a2[words]; 474 475 mask = htonl((0xffffffff) << (0x20 - bits)); 476 477 if ((w1 ^ w2) & mask) 478 return 1; 479 } 480 481 return 0; 482} 483 484int __iproute2_hz_internal; 485 486int __get_hz(void) 487{ 488 char name[1024]; 489 int hz = 0; 490 FILE *fp; 491 492 if (getenv("HZ")) 493 return atoi(getenv("HZ")) ? : HZ; 494 495 if (getenv("PROC_NET_PSCHED")) { 496 snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED")); 497 } else if (getenv("PROC_ROOT")) { 498 snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT")); 499 } else { 500 strcpy(name, "/proc/net/psched"); 501 } 502 fp = fopen(name, "r"); 503 504 if (fp) { 505 unsigned nom, denom; 506 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2) 507 if (nom == 1000000) 508 hz = denom; 509 fclose(fp); 510 } 511 if (hz) 512 return hz; 513 return HZ; 514} 515 516int __iproute2_user_hz_internal; 517 518int __get_user_hz(void) 519{ 520 return sysconf(_SC_CLK_TCK); 521} 522 523const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen) 524{ 525 switch (af) { 526 case AF_INET: 527 case AF_INET6: 528 return inet_ntop(af, addr, buf, buflen); 529#ifndef ANDROID 530 case AF_IPX: 531 return ipx_ntop(af, addr, buf, buflen); 532 case AF_DECnet: 533 { 534 struct dn_naddr dna = { 2, { 0, 0, }}; 535 memcpy(dna.a_addr, addr, 2); 536 return dnet_ntop(af, &dna, buf, buflen); 537 } 538#endif 539 default: 540 return "???"; 541 } 542} 543 544#ifdef RESOLVE_HOSTNAMES 545struct namerec 546{ 547 struct namerec *next; 548 const char *name; 549 inet_prefix addr; 550}; 551 552#define NHASH 257 553static struct namerec *nht[NHASH]; 554 555static const char *resolve_address(const void *addr, int len, int af) 556{ 557 struct namerec *n; 558 struct hostent *h_ent; 559 unsigned hash; 560 static int notfirst; 561 562 563 if (af == AF_INET6 && ((__u32*)addr)[0] == 0 && 564 ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) { 565 af = AF_INET; 566 addr += 12; 567 len = 4; 568 } 569 570 hash = *(__u32 *)(addr + len - 4) % NHASH; 571 572 for (n = nht[hash]; n; n = n->next) { 573 if (n->addr.family == af && 574 n->addr.bytelen == len && 575 memcmp(n->addr.data, addr, len) == 0) 576 return n->name; 577 } 578 if ((n = malloc(sizeof(*n))) == NULL) 579 return NULL; 580 n->addr.family = af; 581 n->addr.bytelen = len; 582 n->name = NULL; 583 memcpy(n->addr.data, addr, len); 584 n->next = nht[hash]; 585 nht[hash] = n; 586 if (++notfirst == 1) 587 sethostent(1); 588 fflush(stdout); 589 590 if ((h_ent = gethostbyaddr(addr, len, af)) != NULL) 591 n->name = strdup(h_ent->h_name); 592 593 /* Even if we fail, "negative" entry is remembered. */ 594 return n->name; 595} 596#endif 597 598 599const char *format_host(int af, int len, const void *addr, 600 char *buf, int buflen) 601{ 602#ifdef RESOLVE_HOSTNAMES 603 if (resolve_hosts) { 604 const char *n; 605 606 if (len <= 0) { 607 switch (af) { 608 case AF_INET: 609 len = 4; 610 break; 611 case AF_INET6: 612 len = 16; 613 break; 614 case AF_IPX: 615 len = 10; 616 break; 617#ifdef AF_DECnet 618 /* I see no reasons why gethostbyname 619 may not work for DECnet */ 620 case AF_DECnet: 621 len = 2; 622 break; 623#endif 624 default: ; 625 } 626 } 627 if (len > 0 && 628 (n = resolve_address(addr, len, af)) != NULL) 629 return n; 630 } 631#endif 632 return rt_addr_n2a(af, len, addr, buf, buflen); 633} 634 635 636char *hexstring_n2a(const __u8 *str, int len, char *buf, int blen) 637{ 638 char *ptr = buf; 639 int i; 640 641 for (i=0; i<len; i++) { 642 if (blen < 3) 643 break; 644 sprintf(ptr, "%02x", str[i]); 645 ptr += 2; 646 blen -= 2; 647 if (i != len-1 && blen > 1) { 648 *ptr++ = ':'; 649 blen--; 650 } 651 } 652 return buf; 653} 654 655__u8* hexstring_a2n(const char *str, __u8 *buf, int blen) 656{ 657 int cnt = 0; 658 659 for (;;) { 660 unsigned acc; 661 char ch; 662 663 acc = 0; 664 665 while ((ch = *str) != ':' && ch != 0) { 666 if (ch >= '0' && ch <= '9') 667 ch -= '0'; 668 else if (ch >= 'a' && ch <= 'f') 669 ch -= 'a'-10; 670 else if (ch >= 'A' && ch <= 'F') 671 ch -= 'A'-10; 672 else 673 return NULL; 674 acc = (acc<<4) + ch; 675 str++; 676 } 677 678 if (acc > 255) 679 return NULL; 680 if (cnt < blen) { 681 buf[cnt] = acc; 682 cnt++; 683 } 684 if (ch == 0) 685 break; 686 ++str; 687 } 688 if (cnt < blen) 689 memset(buf+cnt, 0, blen-cnt); 690 return buf; 691} 692 693int print_timestamp(FILE *fp) 694{ 695 struct timeval tv; 696 char *tstr; 697 698 memset(&tv, 0, sizeof(tv)); 699 gettimeofday(&tv, NULL); 700 701 tstr = asctime(localtime(&tv.tv_sec)); 702 tstr[strlen(tstr)-1] = 0; 703 fprintf(fp, "Timestamp: %s %lu usec\n", tstr, tv.tv_usec); 704 return 0; 705} 706 707int cmdlineno; 708 709#ifndef ANDROID 710/* Like glibc getline but handle continuation lines and comments */ 711ssize_t getcmdline(char **linep, size_t *lenp, FILE *in) 712{ 713 ssize_t cc; 714 char *cp; 715 716 if ((cc = getline(linep, lenp, in)) < 0) 717 return cc; /* eof or error */ 718 ++cmdlineno; 719 720 cp = strchr(*linep, '#'); 721 if (cp) 722 *cp = '\0'; 723 724 while ((cp = strstr(*linep, "\\\n")) != NULL) { 725 char *line1 = NULL; 726 size_t len1 = 0; 727 ssize_t cc1; 728 729 if ((cc1 = getline(&line1, &len1, in)) < 0) { 730 fprintf(stderr, "Missing continuation line\n"); 731 return cc1; 732 } 733 734 ++cmdlineno; 735 *cp = 0; 736 737 cp = strchr(line1, '#'); 738 if (cp) 739 *cp = '\0'; 740 741 *lenp = strlen(*linep) + strlen(line1) + 1; 742 *linep = realloc(*linep, *lenp); 743 if (!*linep) { 744 fprintf(stderr, "Out of memory\n"); 745 *lenp = 0; 746 return -1; 747 } 748 cc += cc1 - 2; 749 strcat(*linep, line1); 750 free(line1); 751 } 752 return cc; 753} 754#endif 755 756/* split command line into argument vector */ 757int makeargs(char *line, char *argv[], int maxargs) 758{ 759 static const char ws[] = " \t\r\n"; 760 char *cp; 761 int argc = 0; 762 763 for (cp = strtok(line, ws); cp; cp = strtok(NULL, ws)) { 764 if (argc >= (maxargs - 1)) { 765 fprintf(stderr, "Too many arguments to command\n"); 766 exit(1); 767 } 768 argv[argc++] = cp; 769 } 770 argv[argc] = NULL; 771 772 return argc; 773} 774