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 <time.h>
  29 #include <sys/time.h>
  30 #include <errno.h>
  31
  32
  33 #include "utils.h"
  34
  35 int get_integer(int *val, const char *arg, int base)
  36 {
  37         long res;
  38         char *ptr;
  39
  40         if (!arg || !*arg)
  41                 return -1;
  42
  43         res = strtol(arg, &ptr, base);
  44
  45         /* If there were no digits at all, strtol()  stores
  46          * the original value of nptr in *endptr (and returns 0).
  47          * In particular, if *nptr is not '\0' but **endptr is '\0' on return,
  48          * the entire string is valid.
  49          */
  50         if (!ptr || ptr == arg || *ptr)
  51                 return -1;
  52
  53         /* If an underflow occurs, strtol() returns LONG_MIN.
  54          * If an overflow occurs,  strtol() returns LONG_MAX.
  55          * In both cases, errno is set to ERANGE.
  56          */
  57         if ((res == LONG_MAX || res == LONG_MIN) && errno == ERANGE)
  58                 return -1;
  59
  60         /* Outside range of int */
  61         if (res < INT_MIN || res > INT_MAX)
  62                 return -1;
  63
  64         *val = res;
  65         return 0;
  66 }
  67
  68 int mask2bits(__u32 netmask)
  69 {
  70         unsigned bits = 0;
  71         __u32 mask = ntohl(netmask);
  72         __u32 host = ~mask;
  73
  74         /* a valid netmask must be 2^n - 1 */
  75         if ((host & (host + 1)) != 0)
  76                 return -1;
  77
  78         for (; mask; mask <<= 1)
  79                 ++bits;
  80         return bits;
  81 }
  82
  83 static int get_netmask(unsigned *val, const char *arg, int base)
  84 {
  85         inet_prefix addr;
  86
  87         if (!get_unsigned(val, arg, base))
  88                 return 0;
  89
  90         /* try coverting dotted quad to CIDR */
  91         if (!get_addr_1(&addr, arg, AF_INET) && addr.family == AF_INET) {
  92                 int b = mask2bits(addr.data[0]);
  93
  94                 if (b >= 0) {
  95                         *val = b;
  96                         return 0;
  97                 }
  98         }
  99
 100         return -1;
 101 }
 102
 103 int get_unsigned(unsigned *val, const char *arg, int base)
 104 {
 105         unsigned long res;
 106         char *ptr;
 107
 108         if (!arg || !*arg)
 109                 return -1;
 110
 111         res = strtoul(arg, &ptr, base);
 112
 113         /* empty string or trailing non-digits */
 114         if (!ptr || ptr == arg || *ptr)
 115                 return -1;
 116
 117         /* overflow */
 118         if (res == ULONG_MAX && errno == ERANGE)
 119                 return -1;
 120
 121         /* out side range of unsigned */
 122         if (res > UINT_MAX)
 123                 return -1;
 124
 125         *val = res;
 126         return 0;
 127 }
 128
 129 /*
 130  * get_time_rtt is "translated" from a similar routine "get_time" in
 131  * tc_util.c.  We don't use the exact same routine because tc passes
 132  * microseconds to the kernel and the callers of get_time_rtt want to
 133  * pass milliseconds (standard unit for rtt values since 2.6.27), and
 134  * have a different assumption for the units of a "raw" number.
 135  */
 136 int get_time_rtt(unsigned *val, const char *arg, int *raw)
 137 {
 138         double t;
 139         unsigned long res;
 140         char *p;
 141
 142         if (strchr(arg, '.') != NULL) {
 143                 t = strtod(arg, &p);
 144                 if (t < 0.0)
 145                         return -1;
 146
 147                 /* extra non-digits */
 148                 if (!p || p == arg || *p)
 149                         return -1;
 150
 151                 /* over/underflow */
 152                 if ((t == HUGE_VALF || t == HUGE_VALL) && errno == ERANGE)
 153                         return -1;
 154         } else {
 155                 res = strtoul(arg, &p, 0);
 156
 157                 /* empty string or trailing non-digits */
 158                 if (!p || p == arg || *p)
 159                         return -1;
 160
 161                 /* overflow */
 162                 if (res == ULONG_MAX && errno == ERANGE)
 163                         return -1;
 164
 165                 t = (double)res;
 166         }
 167
 168         if (p == arg)
 169                 return -1;
 170         *raw = 1;
 171
 172         if (*p) {
 173                 *raw = 0;
 174                 if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 ||
 175                     strcasecmp(p, "secs")==0)
 176                         t *= 1000;
 177                 else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 ||
 178                          strcasecmp(p, "msecs") == 0)
 179                         t *= 1.0; /* allow suffix, do nothing */
 180                 else
 181                         return -1;
 182         }
 183
 184         /* emulate ceil() without having to bring-in -lm and always be >= 1 */
 185
 186         *val = t;
 187         if (*val < t)
 188                 *val += 1;
 189
 190         return 0;
 191
 192 }
 193
 194 int get_u64(__u64 *val, const char *arg, int base)
 195 {
 196         unsigned long long res;
 197         char *ptr;
 198
 199         if (!arg || !*arg)
 200                 return -1;
 201
 202         res = strtoull(arg, &ptr, base);
 203
 204         /* empty string or trailing non-digits */
 205         if (!ptr || ptr == arg || *ptr)
 206                 return -1;
 207
 208         /* overflow */
 209         if (res == ULLONG_MAX && errno == ERANGE)
 210                 return -1;
 211
 212         /* in case ULL is 128 bits */
 213         if (res > 0xFFFFFFFFFFFFFFFFULL)
 214                 return -1;
 215
 216         *val = res;
 217         return 0;
 218 }
 219
 220 int get_u32(__u32 *val, const char *arg, int base)
 221 {
 222         unsigned long res;
 223         char *ptr;
 224
 225         if (!arg || !*arg)
 226                 return -1;
 227         res = strtoul(arg, &ptr, base);
 228
 229         /* empty string or trailing non-digits */
 230         if (!ptr || ptr == arg || *ptr)
 231                 return -1;
 232
 233         /* overflow */
 234         if (res == ULONG_MAX && errno == ERANGE)
 235                 return -1;
 236
 237         /* in case UL > 32 bits */
 238         if (res > 0xFFFFFFFFUL)
 239                 return -1;
 240
 241         *val = res;
 242         return 0;
 243 }
 244
 245 int get_u16(__u16 *val, const char *arg, int base)
 246 {
 247         unsigned long res;
 248         char *ptr;
 249
 250         if (!arg || !*arg)
 251                 return -1;
 252         res = strtoul(arg, &ptr, base);
 253
 254         /* empty string or trailing non-digits */
 255         if (!ptr || ptr == arg || *ptr)
 256                 return -1;
 257
 258         /* overflow */
 259         if (res == ULONG_MAX && errno == ERANGE)
 260                 return -1;
 261
 262         if (res > 0xFFFFUL)
 263                 return -1;
 264
 265         *val = res;
 266         return 0;
 267 }
 268
 269 int get_u8(__u8 *val, const char *arg, int base)
 270 {
 271         unsigned long res;
 272         char *ptr;
 273
 274         if (!arg || !*arg)
 275                 return -1;
 276
 277         res = strtoul(arg, &ptr, base);
 278         /* empty string or trailing non-digits */
 279         if (!ptr || ptr == arg || *ptr)
 280                 return -1;
 281
 282         /* overflow */
 283         if (res == ULONG_MAX && errno == ERANGE)
 284                 return -1;
 285
 286         if (res > 0xFFUL)
 287                 return -1;
 288
 289         *val = res;
 290         return 0;
 291 }
 292
 293 int get_s32(__s32 *val, const char *arg, int base)
 294 {
 295         long res;
 296         char *ptr;
 297
 298         errno = 0;
 299
 300         if (!arg || !*arg)
 301                 return -1;
 302         res = strtol(arg, &ptr, base);
 303         if (!ptr || ptr == arg || *ptr)
 304                 return -1;
 305         if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE)
 306                 return -1;
 307         if (res > INT32_MAX || res < INT32_MIN)
 308                 return -1;
 309
 310         *val = res;
 311         return 0;
 312 }
 313
 314 int get_s16(__s16 *val, const char *arg, int base)
 315 {
 316         long res;
 317         char *ptr;
 318
 319         if (!arg || !*arg)
 320                 return -1;
 321         res = strtol(arg, &ptr, base);
 322         if (!ptr || ptr == arg || *ptr)
 323                 return -1;
 324         if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE)
 325                 return -1;
 326         if (res > 0x7FFF || res < -0x8000)
 327                 return -1;
 328
 329         *val = res;
 330         return 0;
 331 }
 332
 333 int get_s8(__s8 *val, const char *arg, int base)
 334 {
 335         long res;
 336         char *ptr;
 337
 338         if (!arg || !*arg)
 339                 return -1;
 340         res = strtol(arg, &ptr, base);
 341         if (!ptr || ptr == arg || *ptr)
 342                 return -1;
 343         if ((res == LONG_MIN || res == LONG_MAX) && errno == ERANGE)
 344                 return -1;
 345         if (res > 0x7F || res < -0x80)
 346                 return -1;
 347         *val = res;
 348         return 0;
 349 }
 350
 351 /* This uses a non-standard parsing (ie not inet_aton, or inet_pton)
 352  * because of legacy choice to parse 10.8 as 10.8.0.0 not 10.0.0.8
 353  */
 354 static int get_addr_ipv4(__u8 *ap, const char *cp)
 355 {
 356         int i;
 357
 358         for (i = 0; i < 4; i++) {
 359                 unsigned long n;
 360                 char *endp;
 361
 362                 n = strtoul(cp, &endp, 0);
 363                 if (n > 255)
 364                         return -1;      /* bogus network value */
 365
 366                 if (endp == cp) /* no digits */
 367                         return -1;
 368
 369                 ap[i] = n;
 370
 371                 if (*endp == '\0')
 372                         break;
 373
 374                 if (i == 3 || *endp != '.')
 375                         return -1;      /* extra characters */
 376                 cp = endp + 1;
 377         }
 378
 379         return 1;
 380 }
 381
 382 int get_addr_1(inet_prefix *addr, const char *name, int family)
 383 {
 384         memset(addr, 0, sizeof(*addr));
 385
 386         if (strcmp(name, "default") == 0 ||
 387             strcmp(name, "all") == 0 ||
 388             strcmp(name, "any") == 0) {
 389                 if (family == AF_DECnet)
 390                         return -1;
 391                 addr->family = family;
 392                 addr->bytelen = (family == AF_INET6 ? 16 : 4);
 393                 addr->bitlen = -1;
 394                 return 0;
 395         }
 396
 397         if (strchr(name, ':')) {
 398                 addr->family = AF_INET6;
 399                 if (family != AF_UNSPEC && family != AF_INET6)
 400                         return -1;
 401                 if (inet_pton(AF_INET6, name, addr->data) <= 0)
 402                         return -1;
 403                 addr->bytelen = 16;
 404                 addr->bitlen = -1;
 405                 return 0;
 406         }
 407
 408         if (family == AF_DECnet) {
 409                 struct dn_naddr dna;
 410                 addr->family = AF_DECnet;
 411                 if (dnet_pton(AF_DECnet, name, &dna) <= 0)
 412                         return -1;
 413                 memcpy(addr->data, dna.a_addr, 2);
 414                 addr->bytelen = 2;
 415                 addr->bitlen = -1;
 416                 return 0;
 417         }
 418
 419         addr->family = AF_INET;
 420         if (family != AF_UNSPEC && family != AF_INET)
 421                 return -1;
 422
 423         if (get_addr_ipv4((__u8 *)addr->data, name) <= 0)
 424                 return -1;
 425
 426         addr->bytelen = 4;
 427         addr->bitlen = -1;
 428         return 0;
 429 }
 430
 431 int get_prefix_1(inet_prefix *dst, char *arg, int family)
 432 {
 433         int err;
 434         unsigned plen;
 435         char *slash;
 436
 437         memset(dst, 0, sizeof(*dst));
 438
 439         if (strcmp(arg, "default") == 0 ||
 440             strcmp(arg, "any") == 0 ||
 441             strcmp(arg, "all") == 0) {
 442                 if (family == AF_DECnet)
 443                         return -1;
 444                 dst->family = family;
 445                 dst->bytelen = 0;
 446                 dst->bitlen = 0;
 447                 return 0;
 448         }
 449
 450         slash = strchr(arg, '/');
 451         if (slash)
 452                 *slash = 0;
 453
 454         err = get_addr_1(dst, arg, family);
 455         if (err == 0) {
 456                 switch(dst->family) {
 457                         case AF_INET6:
 458                                 dst->bitlen = 128;
 459                                 break;
 460                         case AF_DECnet:
 461                                 dst->bitlen = 16;
 462                                 break;
 463                         default:
 464                         case AF_INET:
 465                                 dst->bitlen = 32;
 466                 }
 467                 if (slash) {
 468                         if (get_netmask(&plen, slash+1, 0)
 469                                         || plen > dst->bitlen) {
 470                                 err = -1;
 471                                 goto done;
 472                         }
 473                         dst->flags |= PREFIXLEN_SPECIFIED;
 474                         dst->bitlen = plen;
 475                 }
 476         }
 477 done:
 478         if (slash)
 479                 *slash = '/';
 480         return err;
 481 }
 482
 483 int get_addr(inet_prefix *dst, const char *arg, int family)
 484 {
 485         if (family == AF_PACKET) {
 486                 fprintf(stderr, "Error: \"%s\" may be inet address, but it is not allowed in this context.\n", arg);
 487                 exit(1);
 488         }
 489         if (get_addr_1(dst, arg, family)) {
 490                 fprintf(stderr, "Error: an inet address is expected rather than \"%s\".\n", arg);
 491                 exit(1);
 492         }
 493         return 0;
 494 }
 495
 496 int get_prefix(inet_prefix *dst, char *arg, int family)
 497 {
 498         if (family == AF_PACKET) {
 499                 fprintf(stderr, "Error: \"%s\" may be inet prefix, but it is not allowed in this context.\n", arg);
 500                 exit(1);
 501         }
 502         if (get_prefix_1(dst, arg, family)) {
 503                 fprintf(stderr, "Error: an inet prefix is expected rather than \"%s\".\n", arg);
 504                 exit(1);
 505         }
 506         return 0;
 507 }
 508
 509 __u32 get_addr32(const char *name)
 510 {
 511         inet_prefix addr;
 512         if (get_addr_1(&addr, name, AF_INET)) {
 513                 fprintf(stderr, "Error: an IP address is expected rather than \"%s\"\n", name);
 514                 exit(1);
 515         }
 516         return addr.data[0];
 517 }
 518
 519 void incomplete_command(void)
 520 {
 521         fprintf(stderr, "Command line is not complete. Try option \"help\"\n");
 522         exit(-1);
 523 }
 524
 525 void missarg(const char *key)
 526 {
 527         fprintf(stderr, "Error: argument \"%s\" is required\n", key);
 528         exit(-1);
 529 }
 530
 531 void invarg(const char *msg, const char *arg)
 532 {
 533         fprintf(stderr, "Error: argument \"%s\" is wrong: %s\n", arg, msg);
 534         exit(-1);
 535 }
 536
 537 void duparg(const char *key, const char *arg)
 538 {
 539         fprintf(stderr, "Error: duplicate \"%s\": \"%s\" is the second value.\n", key, arg);
 540         exit(-1);
 541 }
 542
 543 void duparg2(const char *key, const char *arg)
 544 {
 545         fprintf(stderr, "Error: either \"%s\" is duplicate, or \"%s\" is a garbage.\n", key, arg);
 546         exit(-1);
 547 }
 548
 549 int matches(const char *cmd, const char *pattern)
 550 {
 551         int len = strlen(cmd);
 552         if (len > strlen(pattern))
 553                 return -1;
 554         return memcmp(pattern, cmd, len);
 555 }
 556
 557 int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
 558 {
 559         const __u32 *a1 = a->data;
 560         const __u32 *a2 = b->data;
 561         int words = bits >> 0x05;
 562
 563         bits &= 0x1f;
 564
 565         if (words)
 566                 if (memcmp(a1, a2, words << 2))
 567                         return -1;
 568
 569         if (bits) {
 570                 __u32 w1, w2;
 571                 __u32 mask;
 572
 573                 w1 = a1[words];
 574                 w2 = a2[words];
 575
 576                 mask = htonl((0xffffffff) << (0x20 - bits));
 577
 578                 if ((w1 ^ w2) & mask)
 579                         return 1;
 580         }
 581
 582         return 0;
 583 }
 584
 585 int __iproute2_hz_internal;
 586
 587 int __get_hz(void)
 588 {
 589         char name[1024];
 590         int hz = 0;
 591         FILE *fp;
 592
 593         if (getenv("HZ"))
 594                 return atoi(getenv("HZ")) ? : HZ;
 595
 596         if (getenv("PROC_NET_PSCHED")) {
 597                 snprintf(name, sizeof(name)-1, "%s", getenv("PROC_NET_PSCHED"));
 598         } else if (getenv("PROC_ROOT")) {
 599                 snprintf(name, sizeof(name)-1, "%s/net/psched", getenv("PROC_ROOT"));
 600         } else {
 601                 strcpy(name, "/proc/net/psched");
 602         }
 603         fp = fopen(name, "r");
 604
 605         if (fp) {
 606                 unsigned nom, denom;
 607                 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
 608                         if (nom == 1000000)
 609                                 hz = denom;
 610                 fclose(fp);
 611         }
 612         if (hz)
 613                 return hz;
 614         return HZ;
 615 }
 616
 617 int __iproute2_user_hz_internal;
 618
 619 int __get_user_hz(void)
 620 {
 621         return sysconf(_SC_CLK_TCK);
 622 }
 623
 624 const char *rt_addr_n2a(int af, int len, const void *addr, char *buf, int buflen)
 625 {
 626         switch (af) {
 627         case AF_INET:
 628         case AF_INET6:
 629                 return inet_ntop(af, addr, buf, buflen);
 630         case AF_IPX:
 631                 return ipx_ntop(af, addr, buf, buflen);
 632         case AF_DECnet:
 633         {
 634                 struct dn_naddr dna = { 2, { 0, 0, }};
 635                 memcpy(dna.a_addr, addr, 2);
 636                 return dnet_ntop(af, &dna, buf, buflen);
 637         }
 638         default:
 639                 return "???";
 640         }
 641 }
 642
 643 #ifdef RESOLVE_HOSTNAMES
 644 struct namerec
 645 {
 646         struct namerec *next;
 647         const char *name;
 648         inet_prefix addr;
 649 };
 650
 651 #define NHASH 257
 652 static struct namerec *nht[NHASH];
 653
 654 static const char *resolve_address(const void *addr, int len, int af)
 655 {
 656         struct namerec *n;
 657         struct hostent *h_ent;
 658         unsigned hash;
 659         static int notfirst;
 660
 661
 662         if (af == AF_INET6 && ((__u32*)addr)[0] == 0 &&
 663             ((__u32*)addr)[1] == 0 && ((__u32*)addr)[2] == htonl(0xffff)) {
 664                 af = AF_INET;
 665                 addr += 12;
 666                 len = 4;
 667         }
 668
 669         hash = *(__u32 *)(addr + len - 4) % NHASH;
 670
 671         for (n = nht[hash]; n; n = n->next) {
 672                 if (n->addr.family == af &&
 673                     n->addr.bytelen == len &&
 674                     memcmp(n->addr.data, addr, len) == 0)
 675                         return n->name;
 676         }
 677         if ((n = malloc(sizeof(*n))) == NULL)
 678                 return NULL;
 679         n->addr.family = af;
 680         n->addr.bytelen = len;
 681         n->name = NULL;
 682         memcpy(n->addr.data, addr, len);
 683         n->next = nht[hash];
 684         nht[hash] = n;
 685         if (++notfirst == 1)
 686                 sethostent(1);
 687         fflush(stdout);
 688
 689         if ((h_ent = gethostbyaddr(addr, len, af)) != NULL)
 690                 n->name = strdup(h_ent->h_name);
 691
 692         /* Even if we fail, "negative" entry is remembered. */
 693         return n->name;
 694 }
 695 #endif
 696
 697
 698 const char *format_host(int af, int len, const void *addr,
 699                         char *buf, int buflen)
 700 {
 701 #ifdef RESOLVE_HOSTNAMES
 702         if (resolve_hosts) {
 703                 const char *n;
 704
 705                 if (len <= 0) {
 706                         switch (af) {
 707                         case AF_INET:
 708                                 len = 4;
 709                                 break;
 710                         case AF_INET6:
 711                                 len = 16;
 712                                 break;
 713                         case AF_IPX:
 714                                 len = 10;
 715                                 break;
 716 #ifdef AF_DECnet
 717                         /* I see no reasons why gethostbyname
 718                            may not work for DECnet */
 719                         case AF_DECnet:
 720                                 len = 2;
 721                                 break;
 722 #endif
 723                         default: ;
 724                         }
 725                 }
 726                 if (len > 0 &&
 727                     (n = resolve_address(addr, len, af)) != NULL)
 728                         return n;
 729         }
 730 #endif
 731         return rt_addr_n2a(af, len, addr, buf, buflen);
 732 }
 733
 734
 735 char *hexstring_n2a(const __u8 *str, int len, char *buf, int blen)
 736 {
 737         char *ptr = buf;
 738         int i;
 739
 740         for (i=0; i<len; i++) {
 741                 if (blen < 3)
 742                         break;
 743                 sprintf(ptr, "%02x", str[i]);
 744                 ptr += 2;
 745                 blen -= 2;
 746         }
 747         return buf;
 748 }
 749
 750 __u8* hexstring_a2n(const char *str, __u8 *buf, int blen)
 751 {
 752         int cnt = 0;
 753         char *endptr;
 754
 755         if (strlen(str) % 2)
 756                 return NULL;
 757         while (cnt < blen && strlen(str) > 1) {
 758                 unsigned int tmp;
 759                 char tmpstr[3];
 760
 761                 strncpy(tmpstr, str, 2);
 762                 tmpstr[2] = '\0';
 763                 tmp = strtoul(tmpstr, &endptr, 16);
 764                 if (errno != 0 || tmp > 0xFF || *endptr != '\0')
 765                         return NULL;
 766                 buf[cnt++] = tmp;
 767                 str += 2;
 768         }
 769         return buf;
 770 }
 771
 772 int print_timestamp(FILE *fp)
 773 {
 774         struct timeval tv;
 775         char *tstr;
 776
 777         memset(&tv, 0, sizeof(tv));
 778         gettimeofday(&tv, NULL);
 779
 780         tstr = asctime(localtime(&tv.tv_sec));
 781         tstr[strlen(tstr)-1] = 0;
 782         fprintf(fp, "Timestamp: %s %ld usec\n", tstr, (long)tv.tv_usec);
 783         return 0;
 784 }
 785
 786 int cmdlineno;
 787
 788 /* Like glibc getline but handle continuation lines and comments */
 789 ssize_t getcmdline(char **linep, size_t *lenp, FILE *in)
 790 {
 791         ssize_t cc;
 792         char *cp;
 793
 794         if ((cc = getline(linep, lenp, in)) < 0)
 795                 return cc;      /* eof or error */
 796         ++cmdlineno;
 797
 798         cp = strchr(*linep, '#');
 799         if (cp)
 800                 *cp = '\0';
 801
 802         while ((cp = strstr(*linep, "\\\n")) != NULL) {
 803                 char *line1 = NULL;
 804                 size_t len1 = 0;
 805                 ssize_t cc1;
 806
 807                 if ((cc1 = getline(&line1, &len1, in)) < 0) {
 808                         fprintf(stderr, "Missing continuation line\n");
 809                         return cc1;
 810                 }
 811
 812                 ++cmdlineno;
 813                 *cp = 0;
 814
 815                 cp = strchr(line1, '#');
 816                 if (cp)
 817                         *cp = '\0';
 818
 819                 *lenp = strlen(*linep) + strlen(line1) + 1;
 820                 *linep = realloc(*linep, *lenp);
 821                 if (!*linep) {
 822                         fprintf(stderr, "Out of memory\n");
 823                         *lenp = 0;
 824                         return -1;
 825                 }
 826                 cc += cc1 - 2;
 827                 strcat(*linep, line1);
 828                 free(line1);
 829         }
 830         return cc;
 831 }
 832
 833 /* split command line into argument vector */
 834 int makeargs(char *line, char *argv[], int maxargs)
 835 {
 836         static const char ws[] = " \t\r\n";
 837         char *cp;
 838         int argc = 0;
 839
 840         for (cp = strtok(line, ws); cp; cp = strtok(NULL, ws)) {
 841                 if (argc >= (maxargs - 1)) {
 842                         fprintf(stderr, "Too many arguments to command\n");
 843                         exit(1);
 844                 }
 845                 argv[argc++] = cp;
 846         }
 847         argv[argc] = NULL;
 848
 849         return argc;
 850 }
 851
 852 int inet_get_addr(const char *src, __u32 *dst, struct in6_addr *dst6)
 853 {
 854         if (strchr(src, ':'))
 855                 return inet_pton(AF_INET6, src, dst6);
 856         else
 857                 return inet_pton(AF_INET, src, dst);
 858 }