lib/utils.c

   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 <math.h>
  16 #include <unistd.h>
  17 #include <syslog.h>
  18 #include <fcntl.h>
  19 #include <limits.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <string.h>
  23 #include <netdb.h>
  24 #include <arpa/inet.h>
  25 #include <asm/types.h>
  26 #include <linux/pkt_sched.h>
  27 #include <linux/param.h>
  28 #include <linux/if_arp.h>
  29 #include <linux/mpls.h>
  30 #include <time.h>
  31 #include <sys/time.h>
  32 #include <errno.h>
  33
  34 #include "rt_names.h"
  35 #include "utils.h"
  36 #include "namespace.h"
  37
  38 int timestamp_short = 0;
  39
  40 int get_hex(char c)
  41 {
  42         if (c >= 'A' && c <= 'F')
  43                 return c - 'A' + 10;
  44         if (c >= 'a' && c <= 'f')
  45                 return c - 'a' + 10;
  46         if (c >= '0' && c <= '9')
  47                 return c - '0';
  48
  49         return -1;
  50 }
  51
  52 int get_integer(int *val, const char *arg, int base)
  53 {
  54         long res;
  55         char *ptr;
  56
  57         if (!arg || !*arg)
  58                 return -1;
  59
  60         res = strtol(arg, &ptr, base);
  61
  62         /* If there were no digits at all, strtol()  stores
  63          * the original value of nptr in *endptr (and returns 0).
  64          * In particular, if *nptr is not '\0' but **endptr is '\0' on return,
  65          * the entire string is valid.
  66          */
  67         if (!ptr || ptr == arg || *ptr)
  68                 return -1;
  69
  70         /* If an underflow occurs, strtol() returns LONG_MIN.
  71          * If an overflow occurs,  strtol() returns LONG_MAX.
  72          * In both cases, errno is set to ERANGE.
  73          */
  74         if ((res == LONG_MAX || res == LONG_MIN) && errno == ERANGE)
  75                 return -1;
  76
  77         /* Outside range of int */
  78         if (res < INT_MIN || res > INT_MAX)
  79                 return -1;
  80
  81         *val = res;
  82         return 0;
  83 }
  84
  85 int mask2bits(__u32 netmask)
  86 {
  87         unsigned bits = 0;
  88         __u32 mask = ntohl(netmask);
  89         __u32 host = ~mask;
  90
  91         /* a valid netmask must be 2^n - 1 */
  92         if ((host & (host + 1)) != 0)
  93                 return -1;
  94
  95         for (; mask; mask <<= 1)
  96                 ++bits;
  97         return bits;
  98 }
  99
 100 static int get_netmask(unsigned *val, const char *arg, int base)
 101 {
 102         inet_prefix addr;
 103
 104         if (!get_unsigned(val, arg, base))
 105                 return 0;
 106
 107         /* try coverting dotted quad to CIDR */
 108         if (!get_addr_1(&addr, arg, AF_INET) && addr.family == AF_INET) {
 109                 int b = mask2bits(addr.data[0]);
 110
 111                 if (b >= 0) {
 112                         *val = b;
 113                         return 0;
 114                 }
 115         }
 116
 117         return -1;
 118 }
 119
 120 int get_unsigned(unsigned *val, const char *arg, int base)
 121 {
 122         unsigned long res;
 123         char *ptr;
 124
 125         if (!arg || !*arg)
 126                 return -1;
 127
 128         res = strtoul(arg, &ptr, base);
 129
 130         /* empty string or trailing non-digits */
 131         if (!ptr || ptr == arg || *ptr)
 132                 return -1;
 133
 134         /* overflow */
 135         if (res == ULONG_MAX && errno == ERANGE)
 136                 return -1;
 137
 138         /* out side range of unsigned */
 139         if (res > UINT_MAX)
 140                 return -1;
 141
 142         *val = res;
 143         return 0;
 144 }
 145
 146 /*
 147  * get_time_rtt is "translated" from a similar routine "get_time" in
 148  * tc_util.c.  We don't use the exact same routine because tc passes
 149  * microseconds to the kernel and the callers of get_time_rtt want to
 150  * pass milliseconds (standard unit for rtt values since 2.6.27), and
 151  * have a different assumption for the units of a "raw" number.
 152  */
 153 int get_time_rtt(unsigned *val, const char *arg, int *raw)
 154 {
 155         double t;
 156         unsigned long res;
 157         char *p;
 158
 159         if (strchr(arg, '.') != NULL) {
 160                 t = strtod(arg, &p);
 161                 if (t < 0.0)
 162                         return -1;
 163
 164                 /* no digits? */
 165                 if (!p || p == arg)
 166                         return -1;
 167
 168                 /* over/underflow */
 169                 if ((t == HUGE_VALF || t == HUGE_VALL) && errno == ERANGE)
 170                         return -1;
 171         } else {
 172                 res = strtoul(arg, &p, 0);
 173
 174                 /* empty string? */
 175                 if (!p || p == arg)
 176                         return -1;
 177
 178                 /* overflow */
 179                 if (res == ULONG_MAX && errno == ERANGE)
 180                         return -1;
 181
 182                 t = (double)res;
 183         }
 184
 185         if (p == arg)
 186                 return -1;
 187         *raw = 1;
 188
 189         if (*p) {
 190                 *raw = 0;
 191                 if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 ||
 192                     strcasecmp(p, "secs")==0)
 193                         t *= 1000;
 194                 else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 ||
 195                          strcasecmp(p, "msecs") == 0)
 196                         t *= 1.0; /* allow suffix, do nothing */
 197                 else
 198                         return -1;
 199         }
 200
 201         /* emulate ceil() without having to bring-in -lm and always be >= 1 */
 202
 203         *val = t;
 204         if (*val < t)
 205                 *val += 1;
 206
 207         return 0;
 208
 209 }
 210
 211 int get_u64(__u64 *val, const char *arg, int base)
 212 {
 213         unsigned long long res;
 214         char *ptr;
 215
 216         if (!arg || !*arg)
 217                 return -1;
 218
 219         res = strtoull(arg, &ptr, base);
 220
 221         /* empty string or trailing non-digits */
 222         if (!ptr || ptr == arg || *ptr)
 223                 return -1;
 224
 225         /* overflow */
 226         if (res == ULLONG_MAX && errno == ERANGE)
 227                 return -1;
 228
 229         /* in case ULL is 128 bits */
 230         if (res > 0xFFFFFFFFFFFFFFFFULL)
 231                 return -1;
 232
 233         *val = res;
 234         return 0;
 235 }
 236
 237 int get_u32(__u32 *val, const char *arg, int base)
 238 {
 239         unsigned long res;
 240         char *ptr;
 241
 242         if (!arg || !*arg)
 243                 return -1;
 244         res = strtoul(arg, &ptr, base);
 245
 246         /* empty string or trailing non-digits */
 247         if (!ptr || ptr == arg || *ptr)
 248                 return -1;
 249
 250         /* overflow */
 251         if (res == ULONG_MAX && errno == ERANGE)
 252                 return -1;
 253
 254         /* in case UL > 32 bits */
 255         if (res > 0xFFFFFFFFUL)
 256                 return -1;
 257
 258         *val = res;
 259         return 0;
 260 }
 261
 262 int get_u16(__u16 *val, const char *arg, int base)
 263 {
 264         unsigned long res;
 265         char *ptr;
 266
 267         if (!arg || !*arg)
 268                 return -1;
 269         res = strtoul(arg, &ptr, base);
 270
 271         /* empty string or trailing non-digits */
 272         if (!ptr || ptr == arg || *ptr)
 273                 return -1;
 274
 275         /* overflow */
 276         if (res == ULONG_MAX && errno == ERANGE)
 277                 return -1;
 278
 279         if (res > 0xFFFFUL)
 280                 return -1;
 281
 282         *val = res;
 283         return 0;
 284 }
 285
 286 int get_u8(__u8 *val, const char *arg, int base)
 287 {
 288         unsigned long res;
 289         char *ptr;
 290
 291         if (!arg || !*arg)
 292                 return -1;
 293
 294         res = strtoul(arg, &ptr, base);
 295         /* empty string or trailing non-digits */
 296         if (!ptr || ptr == arg || *ptr)
 297                 return -1;
 298
 299         /* overflow */
 300         if (res == ULONG_MAX && errno == ERANGE)
 301                 return -1;
 302
 303         if (res > 0xFFUL)
 304                 return -1;
 305
 306         *val = res;
 307         return 0;
 308 }
 309
 310 int get_s32(__s32 *val, const char *arg, int base)
 311 {
 312         long res;
 313         char *ptr;
 314
 315         errno = 0;
 316
 317         if (!arg || !*arg)
 318                 return -1;
 319         res = strtol(arg, &ptr, base);
 320         if (!ptr || ptr == arg || *ptr)
 321                 return -1;
 322         if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE)
 323                 return -1;
 324         if (res > INT32_MAX || res < INT32_MIN)
 325                 return -1;
 326
 327         *val = res;
 328         return 0;
 329 }
 330
 331 int get_s16(__s16 *val, const char *arg, int base)
 332 {
 333         long res;
 334         char *ptr;
 335
 336         if (!arg || !*arg)
 337                 return -1;
 338         res = strtol(arg, &ptr, base);
 339         if (!ptr || ptr == arg || *ptr)
 340                 return -1;
 341         if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE)
 342                 return -1;
 343         if (res > 0x7FFF || res < -0x8000)
 344                 return -1;
 345
 346         *val = res;
 347         return 0;
 348 }
 349
 350 int get_s8(__s8 *val, const char *arg, int base)
 351 {
 352         long res;
 353         char *ptr;
 354
 355         if (!arg || !*arg)
 356                 return -1;
 357         res = strtol(arg, &ptr, base);
 358         if (!ptr || ptr == arg || *ptr)
 359                 return -1;
 360         if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE)
 361                 return -1;
 362         if (res > 0x7F || res < -0x80)
 363                 return -1;
 364         *val = res;
 365         return 0;
 366 }
 367
 368 int get_be64(__be64 *val, const char *arg, int base)
 369 {
 370         __u64 v;
 371         int ret = get_u64(&v, arg, base);
 372
 373         if (!ret)
 374                 *val = htonll(v);
 375
 376         return ret;
 377 }
 378
 379 int get_be32(__be32 *val, const char *arg, int base)
 380 {
 381         __u32 v;
 382         int ret = get_u32(&v, arg, base);
 383
 384         if (!ret)
 385                 *val = htonl(v);
 386
 387         return ret;
 388 }
 389
 390 int get_be16(__be16 *val, const char *arg, int base)
 391 {
 392         __u16 v;
 393         int ret = get_u16(&v, arg, base);
 394
 395         if (!ret)
 396                 *val = htons(v);
 397
 398         return ret;
 399 }
 400
 401 /* This uses a non-standard parsing (ie not inet_aton, or inet_pton)
 402  * because of legacy choice to parse 10.8 as 10.8.0.0 not 10.0.0.8
 403  */
 404 static int get_addr_ipv4(__u8 *ap, const char *cp)
 405 {
 406         int i;
 407
 408         for (i = 0; i < 4; i++) {
 409                 unsigned long n;
 410                 char *endp;
 411
 412                 n = strtoul(cp, &endp, 0);
 413                 if (n > 255)
 414                         return -1;      /* bogus network value */
 415
 416                 if (endp == cp) /* no digits */
 417                         return -1;
 418
 419                 ap[i] = n;
 420
 421                 if (*endp == '\0')
 422                         break;
 423
 424                 if (i == 3 || *endp != '.')
 425                         return -1;      /* extra characters */
 426                 cp = endp + 1;
 427         }
 428
 429         return 1;
 430 }
 431
 432 int get_addr64(__u64 *ap, const char *cp)
 433 {
 434         int i;
 435
 436         union {
 437                 __u16 v16[4];
 438                 __u64 v64;
 439         } val;
 440
 441         for (i = 0; i < 4; i++) {
 442                 unsigned long n;
 443                 char *endp;
 444
 445                 n = strtoul(cp, &endp, 16);
 446                 if (n > 0xffff)
 447                         return -1;      /* bogus network value */
 448
 449                 if (endp == cp) /* no digits */
 450                         return -1;
 451
 452                 val.v16[i] = htons(n);
 453
 454                 if (*endp == '\0')
 455                         break;
 456
 457                 if (i == 3 || *endp != ':')
 458                         return -1;      /* extra characters */
 459                 cp = endp + 1;
 460         }
 461
 462         *ap = val.v64;
 463
 464         return 1;
 465 }
 466
 467 int get_addr_1(inet_prefix *addr, const char *name, int family)
 468 {
 469         memset(addr, 0, sizeof(*addr));
 470
 471         if (strcmp(name, "default") == 0 ||
 472             strcmp(name, "all") == 0 ||
 473             strcmp(name, "any") == 0) {
 474                 if ((family == AF_DECnet) || (family == AF_MPLS))
 475                         return -1;
 476                 addr->family = family;
 477                 addr->bytelen = (family == AF_INET6 ? 16 : 4);
 478                 addr->bitlen = -1;
 479                 return 0;
 480         }
 481
 482         if (family == AF_PACKET) {
 483                 int len;
 484                 len = ll_addr_a2n((char *)&addr->data, sizeof(addr->data), name);
 485                 if (len < 0)
 486                         return -1;
 487
 488                 addr->family = AF_PACKET;
 489                 addr->bytelen = len;
 490                 addr->bitlen = len * 8;
 491                 return 0;
 492         }
 493
 494         if (strchr(name, ':')) {
 495                 addr->family = AF_INET6;
 496                 if (family != AF_UNSPEC && family != AF_INET6)
 497                         return -1;
 498                 if (inet_pton(AF_INET6, name, addr->data) <= 0)
 499                         return -1;
 500                 addr->bytelen = 16;
 501                 addr->bitlen = -1;
 502                 return 0;
 503         }
 504
 505         if (family == AF_DECnet) {
 506                 struct dn_naddr dna;
 507                 addr->family = AF_DECnet;
 508                 if (dnet_pton(AF_DECnet, name, &dna) <= 0)
 509                         return -1;
 510                 memcpy(addr->data, dna.a_addr, 2);
 511                 addr->bytelen = 2;
 512                 addr->bitlen = -1;
 513                 return 0;
 514         }
 515
 516         if (family == AF_MPLS) {
 517                 int i;
 518                 addr->family = AF_MPLS;
 519                 if (mpls_pton(AF_MPLS, name, addr->data) <= 0)
 520                         return -1;
 521                 addr->bytelen = 4;
 522                 addr->bitlen = 20;
 523                 /* How many bytes do I need? */
 524                 for (i = 0; i < 8; i++) {
 525                         if (ntohl(addr->data[i]) & MPLS_LS_S_MASK) {
 526                                 addr->bytelen = (i + 1)*4;
 527                                 break;
 528                         }
 529                 }
 530                 return 0;
 531         }
 532
 533         addr->family = AF_INET;
 534         if (family != AF_UNSPEC && family != AF_INET)
 535                 return -1;
 536
 537         if (get_addr_ipv4((__u8 *)addr->data, name) <= 0)
 538                 return -1;
 539
 540         addr->bytelen = 4;
 541         addr->bitlen = -1;
 542         return 0;
 543 }
 544
 545 int af_bit_len(int af)
 546 {
 547         switch (af) {
 548         case AF_INET6:
 549                 return 128;
 550         case AF_INET:
 551                 return 32;
 552         case AF_DECnet:
 553                 return 16;
 554         case AF_IPX:
 555                 return 80;
 556         case AF_MPLS:
 557                 return 20;
 558         }
 559
 560         return 0;
 561 }
 562
 563 int af_byte_len(int af)
 564 {
 565         return af_bit_len(af) / 8;
 566 }
 567
 568 int get_prefix_1(inet_prefix *dst, char *arg, int family)
 569 {
 570         int err;
 571         unsigned plen;
 572         char *slash;
 573
 574         memset(dst, 0, sizeof(*dst));
 575
 576         if (strcmp(arg, "default") == 0 ||
 577             strcmp(arg, "any") == 0 ||
 578             strcmp(arg, "all") == 0) {
 579                 if ((family == AF_DECnet) || (family == AF_MPLS))
 580                         return -1;
 581                 dst->family = family;
 582                 dst->bytelen = 0;
 583                 dst->bitlen = 0;
 584                 return 0;
 585         }
 586
 587         slash = strchr(arg, '/');
 588         if (slash)
 589                 *slash = 0;
 590
 591         err = get_addr_1(dst, arg, family);
 592         if (err == 0) {
 593                 dst->bitlen = af_bit_len(dst->family);
 594
 595                 if (slash) {
 596                         if (get_netmask(&plen, slash+1, 0)
 597                             || plen > dst->bitlen) {
 598                                 err = -1;
 599                                 goto done;
 600                         }
 601                         dst->flags |= PREFIXLEN_SPECIFIED;
 602                         dst->bitlen = plen;
 603                 }
 604         }
 605 done:
 606         if (slash)
 607                 *slash = '/';
 608         return err;
 609 }
 610
 611 int get_addr(inet_prefix *dst, const char *arg, int family)
 612 {
 613         if (get_addr_1(dst, arg, family)) {
 614                 fprintf(stderr, "Error: %s address is expected rather than \"%s\".\n",
 615                                 family_name(dst->family) ,arg);
 616                 exit(1);
 617         }
 618         return 0;
 619 }
 620
 621 int get_prefix(inet_prefix *dst, char *arg, int family)
 622 {
 623         if (family == AF_PACKET) {
 624                 fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
 625                 exit(1);
 626         }
 627
 628         if (get_prefix_1(dst, arg, family)) {
 629                 fprintf(stderr, "Error: %s prefix is expected rather than \"%s\".\n",
 630                                 family_name(dst->family) ,arg);
 631                 exit(1);
 632         }
 633         return 0;
 634 }
 635
 636 __u32 get_addr32(const char *name)
 637 {
 638         inet_prefix addr;
 639         if (get_addr_1(&addr, name, AF_INET)) {
 640                 fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
 641                 exit(1);
 642         }
 643         return addr.data[0];
 644 }
 645
 646 void incomplete_command(void)
 647 {
 648         fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
 649         exit(-1);
 650 }
 651
 652 void missarg(const char *key)
 653 {
 654         fprintf(stderr, "Error: argument \"%s\" is required\n", key);
 655         exit(-1);
 656 }
 657
 658 void invarg(const char *msg, const char *arg)
 659 {
 660         fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
 661         exit(-1);
 662 }
 663
 664 void duparg(const char *key, const char *arg)
 665 {
 666         fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
 667         exit(-1);
 668 }
 669
 670 void duparg2(const char *key, const char *arg)
 671 {
 672         fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
 673         exit(-1);
 674 }
 675
 676 int matches(const char *cmd, const char *pattern)
 677 {
 678         int len = strlen(cmd);
 679         if (len > strlen(pattern))
 680                 return -1;
 681         return memcmp(pattern, cmd, len);
 682 }
 683
 684 int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
 685 {
 686         const __u32 *a1 = a->data;
 687         const __u32 *a2 = b->data;
 688         int words = bits >> 0x05;
 689
 690         bits &= 0x1f;
 691
 692         if (words)
 693                 if (memcmp(a1, a2, words << 2))
 694                         return -1;
 695
 696         if (bits) {
 697                 __u32 w1, w2;
 698                 __u32 mask;
 699
 700                 w1 = a1[words];
 701                 w2 = a2[words];
 702
 703                 mask = htonl((0xffffffff) << (0x20 - bits));
 704
 705                 if ((w1 ^ w2) & mask)
 706                         return 1;
 707         }
 708
 709         return 0;
 710 }
 711
 712 int __iproute2_hz_internal;
 713
 714 int __get_hz(void)
 715 {
 716         char name[1024];
 717         int hz = 0;
 718         FILE *fp;
 719
 720         if (getenv("HZ"))
 721                 return atoi(getenv("HZ")) ? : HZ;
 722
 723         if (getenv("PROC_NET_PSCHED")) {
 724                 snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
 725         } else if (getenv("PROC_ROOT")) {
 726                 snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
 727         } else {
 728                 strcpy(name, "/proc/net/psched");
 729         }
 730         fp = fopen(name, "r");
 731
 732         if (fp) {
 733                 unsigned nom, denom;
 734                 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
 735                         if (nom == 1000000)
 736                                 hz = denom;
 737                 fclose(fp);
 738         }
 739         if (hz)
 740                 return hz;
 741         return HZ;
 742 }
 743
 744 int __iproute2_user_hz_internal;
 745
 746 int __get_user_hz(void)
 747 {
 748         return sysconf(_SC_CLK_TCK);
 749 }
 750
 751 const char *rt_addr_n2a_r(int af, int len, const void *addr, char *buf, int buflen)
 752 {
 753         switch (af) {
 754         case AF_INET:
 755         case AF_INET6:
 756                 return inet_ntop(af, addr, buf, buflen);
 757         case AF_MPLS:
 758                 return mpls_ntop(af, addr, buf, buflen);
 759         case AF_IPX:
 760                 return ipx_ntop(af, addr, buf, buflen);
 761         case AF_DECnet:
 762         {
 763                 struct dn_naddr dna = { 2, { 0, 0, }};
 764                 memcpy(dna.a_addr, addr, 2);
 765                 return dnet_ntop(af, &dna, buf, buflen);
 766         }
 767         case AF_PACKET:
 768                 return ll_addr_n2a(addr, len, ARPHRD_VOID, buf, buflen);
 769         default:
 770                 return "???";
 771         }
 772 }
 773
 774 const char *rt_addr_n2a(int af, int len, const void *addr)
 775 {
 776         static char buf[256];
 777
 778         return rt_addr_n2a_r(af, len, addr, buf, 256);
 779 }
 780
 781 int read_family(const char *name)
 782 {
 783         int family = AF_UNSPEC;
 784         if (strcmp(name, "inet") == 0)
 785                 family = AF_INET;
 786         else if (strcmp(name, "inet6") == 0)
 787                 family = AF_INET6;
 788         else if (strcmp(name, "dnet") == 0)
 789                 family = AF_DECnet;
 790         else if (strcmp(name, "link") == 0)
 791                 family = AF_PACKET;
 792         else if (strcmp(name, "ipx") == 0)
 793                 family = AF_IPX;
 794         else if (strcmp(name, "mpls") == 0)
 795                 family = AF_MPLS;
 796         else if (strcmp(name, "bridge") == 0)
 797                 family = AF_BRIDGE;
 798         return family;
 799 }
 800
 801 const char *family_name(int family)
 802 {
 803         if (family == AF_INET)
 804                 return "inet";
 805         if (family == AF_INET6)
 806                 return "inet6";
 807         if (family == AF_DECnet)
 808                 return "dnet";
 809         if (family == AF_PACKET)
 810                 return "link";
 811         if (family == AF_IPX)
 812                 return "ipx";
 813         if (family == AF_MPLS)
 814                 return "mpls";
 815         if (family == AF_BRIDGE)
 816                 return "bridge";
 817         return "???";
 818 }
 819
 820 #ifdef RESOLVE_HOSTNAMES
 821 struct namerec
 822 {
 823         struct namerec *next;
 824         const char *name;
 825         inet_prefix addr;
 826 };
 827
 828 #define NHASH 257
 829 static struct namerec *nht[NHASH];
 830
 831 static const char *resolve_address(const void *addr, int len, int af)
 832 {
 833         struct namerec *n;
 834         struct hostent *h_ent;
 835         unsigned hash;
 836         static int notfirst;
 837
 838
 839         if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
 840             ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
 841                 af = AF_INET;
 842                 addr += 12;
 843                 len = 4;
 844         }
 845
 846         hash = *(__u32 *)(addr + len - 4) % NHASH;
 847
 848         for (n = nht[hash]; n; n = n->next) {
 849                 if (n->addr.family == af &&
 850                     n->addr.bytelen == len &&
 851                     memcmp(n->addr.data, addr, len) == 0)
 852                         return n->name;
 853         }
 854         if ((n = malloc(sizeof(*n))) == NULL)
 855                 return NULL;
 856         n->addr.family = af;
 857         n->addr.bytelen = len;
 858         n->name = NULL;
 859         memcpy(n->addr.data, addr, len);
 860         n->next = nht[hash];
 861         nht[hash] = n;
 862         if (++notfirst == 1)
 863                 sethostent(1);
 864         fflush(stdout);
 865
 866         if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
 867                 n->name = strdup(h_ent->h_name);
 868
 869         /* Even if we fail, "negative" entry is remembered. */
 870         return n->name;
 871 }
 872 #endif
 873
 874 const char *format_host_r(int af, int len, const void *addr,
 875                         char *buf, int buflen)
 876 {
 877 #ifdef RESOLVE_HOSTNAMES
 878         if (resolve_hosts) {
 879                 const char *n;
 880
 881                 len = len <= 0 ? af_byte_len(af) : len;
 882
 883                 if (len > 0 &&
 884                     (n = resolve_address(addr, len, af)) != NULL)
 885                         return n;
 886         }
 887 #endif
 888         return rt_addr_n2a_r(af, len, addr, buf, buflen);
 889 }
 890
 891 const char *format_host(int af, int len, const void *addr)
 892 {
 893         static char buf[256];
 894
 895         return format_host_r(af, len, addr, buf, 256);
 896 }
 897
 898
 899 char *hexstring_n2a(const __u8 *str, int len, char *buf, int blen)
 900 {
 901         char *ptr = buf;
 902         int i;
 903
 904         for (i=0; i<len; i++) {
 905                 if (blen < 3)
 906                         break;
 907                 sprintf(ptr, "%02x", str[i]);
 908                 ptr += 2;
 909                 blen -= 2;
 910         }
 911         return buf;
 912 }
 913
 914 __u8 *hexstring_a2n(const char *str, __u8 *buf, int blen, unsigned int *len)
 915 {
 916         unsigned int cnt = 0;
 917         char *endptr;
 918
 919         if (strlen(str) % 2)
 920                 return NULL;
 921         while (cnt < blen && strlen(str) > 1) {
 922                 unsigned int tmp;
 923                 char tmpstr[3];
 924
 925                 strncpy(tmpstr, str, 2);
 926                 tmpstr[2] = '\0';
 927                 errno = 0;
 928                 tmp = strtoul(tmpstr, &endptr, 16);
 929                 if (errno != 0 || tmp > 0xFF || *endptr != '\0')
 930                         return NULL;
 931                 buf[cnt++] = tmp;
 932                 str += 2;
 933         }
 934
 935         if (len)
 936                 *len = cnt;
 937
 938         return buf;
 939 }
 940
 941 int addr64_n2a(__u64 addr, char *buff, size_t len)
 942 {
 943         __u16 *words = (__u16 *)&addr;
 944         __u16 v;
 945         int i, ret;
 946         size_t written = 0;
 947         char *sep = ":";
 948
 949         for (i = 0; i < 4; i++) {
 950                 v = ntohs(words[i]);
 951
 952                 if (i == 3)
 953                         sep = "";
 954
 955                 ret = snprintf(&buff[written], len - written, "%x%s", v, sep);
 956                 if (ret < 0)
 957                         return ret;
 958
 959                 written += ret;
 960         }
 961
 962         return written;
 963 }
 964
 965 int print_timestamp(FILE *fp)
 966 {
 967         struct timeval tv;
 968         struct tm *tm;
 969
 970         gettimeofday(&tv, NULL);
 971         tm = localtime(&tv.tv_sec);
 972
 973         if (timestamp_short) {
 974                 char tshort[40];
 975
 976                 strftime(tshort, sizeof(tshort), "%Y-%m-%dT%H:%M:%S", tm);
 977                 fprintf(fp, "[%s.%06ld] ", tshort, tv.tv_usec);
 978         } else {
 979                 char *tstr = asctime(tm);
 980
 981                 tstr[strlen(tstr)-1] = 0;
 982                 fprintf(fp, "Timestamp: %s %ld usec\n",
 983                         tstr, tv.tv_usec);
 984         }
 985
 986         return 0;
 987 }
 988
 989 int cmdlineno;
 990
 991 /* Like glibc getline but handle continuation lines and comments */
 992 ssize_t getcmdline(char **linep, size_t *lenp, FILE *in)
 993 {
 994         ssize_t cc;
 995         char *cp;
 996
 997         if ((cc = getline(linep, lenp, in)) < 0)
 998                 return cc;      /* eof or error */
 999         ++cmdlineno;
1000
1001         cp = strchr(*linep, '#');
1002         if (cp)
1003                 *cp = '\0';
1004
1005         while ((cp = strstr(*linep, "\\\n")) != NULL) {
1006                 char *line1 = NULL;
1007                 size_t len1 = 0;
1008                 ssize_t cc1;
1009
1010                 if ((cc1 = getline(&line1, &len1, in)) < 0) {
1011                         fprintf(stderr, "Missing continuation line\n");
1012                         return cc1;
1013                 }
1014
1015                 ++cmdlineno;
1016                 *cp = 0;
1017
1018                 cp = strchr(line1, '#');
1019                 if (cp)
1020                         *cp = '\0';
1021
1022                 *lenp = strlen(*linep) + strlen(line1) + 1;
1023                 *linep = realloc(*linep, *lenp);
1024                 if (!*linep) {
1025                         fprintf(stderr, "Out of memory\n");
1026                         *lenp = 0;
1027                         return -1;
1028                 }
1029                 cc += cc1 - 2;
1030                 strcat(*linep, line1);
1031                 free(line1);
1032         }
1033         return cc;
1034 }
1035
1036 /* split command line into argument vector */
1037 int makeargs(char *line, char *argv[], int maxargs)
1038 {
1039         static const char ws[] = " \t\r\n";
1040         char *cp;
1041         int argc = 0;
1042
1043         for (cp = line + strspn(line, ws); *cp; cp += strspn(cp, ws)) {
1044                 if (argc >= (maxargs - 1)) {
1045                         fprintf(stderr, "Too many arguments to command\n");
1046                         exit(1);
1047                 }
1048
1049                 /* word begins with quote */
1050                 if (*cp == '\'' || *cp == '"') {
1051                         char quote = *cp++;
1052
1053                         argv[argc++] = cp;
1054                         /* find ending quote */
1055                         cp = strchr(cp, quote);
1056                         if (cp == NULL) {
1057                                 fprintf(stderr, "Unterminated quoted string\n");
1058                                 exit(1);
1059                         }
1060                         *cp++ = 0;
1061                         continue;
1062                 }
1063
1064                 argv[argc++] = cp;
1065                 /* find end of word */
1066                 cp += strcspn(cp, ws);
1067                 *cp++ = 0;
1068         }
1069         argv[argc] = NULL;
1070
1071         return argc;
1072 }
1073
1074 int inet_get_addr(const char *src, __u32 *dst, struct in6_addr *dst6)
1075 {
1076         if (strchr(src, ':'))
1077                 return inet_pton(AF_INET6, src, dst6);
1078         else
1079                 return inet_pton(AF_INET, src, dst);
1080 }
1081
1082 void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n)
1083 {
1084         char *tstr;
1085         time_t secs = ((__u32*)NLMSG_DATA(n))[0];
1086         long usecs = ((__u32*)NLMSG_DATA(n))[1];
1087         tstr = asctime(localtime(&secs));
1088         tstr[strlen(tstr)-1] = 0;
1089         fprintf(fp, "Timestamp: %s %lu us\n", tstr, usecs);
1090 }
1091
1092 static int on_netns(char *nsname, void *arg)
1093 {
1094         struct netns_func *f = arg;
1095
1096         if (netns_switch(nsname))
1097                 return -1;
1098
1099         return f->func(nsname, f->arg);
1100 }
1101
1102 static int on_netns_label(char *nsname, void *arg)
1103 {
1104         printf("\nnetns: %s\n", nsname);
1105         return on_netns(nsname, arg);
1106 }
1107
1108 int do_each_netns(int (*func)(char *nsname, void *arg), void *arg,
1109                 bool show_label)
1110 {
1111         struct netns_func nsf = { .func = func, .arg = arg };
1112
1113         if (show_label)
1114                 return netns_foreach(on_netns_label, &nsf);
1115
1116         return netns_foreach(on_netns, &nsf);
1117 }
1118
1119 char *int_to_str(int val, char *buf)
1120 {
1121         sprintf(buf, "%d", val);
1122         return buf;
1123 }
1124
1125 int get_guid(__u64 *guid, const char *arg)
1126 {
1127         unsigned long int tmp;
1128         char *endptr;
1129         int i;
1130
1131 #define GUID_STR_LEN 23
1132         /* Verify strict format: format string must be
1133          * xx:xx:xx:xx:xx:xx:xx:xx where xx can be an arbitrary
1134          * hex digit
1135          */
1136
1137         if (strlen(arg) != GUID_STR_LEN)
1138                 return -1;
1139
1140         /* make sure columns are in place */
1141         for (i = 0; i < 7; i++)
1142                 if (arg[2 + i * 3] != ':')
1143                         return -1;
1144
1145         *guid = 0;
1146         for (i = 0; i < 8; i++) {
1147                 tmp = strtoul(arg + i * 3, &endptr, 16);
1148                 if (endptr != arg + i * 3 + 2)
1149                         return -1;
1150
1151                 if (tmp > 255)
1152                         return -1;
1153
1154                  *guid |= tmp << (56 - 8 * i);
1155         }
1156
1157         return 0;
1158 }