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util-ank.c

/*
 * utils.c
 *
 *          This program is free software; you can redistribute it and/or
 *          modify it under the terms of the GNU General Public License
 *          as published by the Free Software Foundation; either version
 *          2 of the License, or (at your option) any later version.
 *
 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *
 * Changes:
 *
 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <resolv.h>

#include "intl.h"
#include "util-ank.h"

#ifndef AF_INET6
#define AF_INET6  10
#endif

int scan_number(char *arg, unsigned *val)
{
      unsigned long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtoul(arg, &ptr, 0);
      if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
            return -1;
      *val = res;
      return 0;
}

int get_integer(int *val, char *arg, int base)
{
      long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtol(arg, &ptr, base);
      if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
            return -1;
      *val = res;
      return 0;
}

int get_unsigned(unsigned *val, char *arg, int base)
{
      unsigned long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtoul(arg, &ptr, base);
      if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
            return -1;
      *val = res;
      return 0;
}

int get_u32(__u32 *val, char *arg, int base)
{
      unsigned long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtoul(arg, &ptr, base);
      if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
            return -1;
      *val = res;
      return 0;
}

int get_u16(__u16 *val, char *arg, int base)
{
      unsigned long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtoul(arg, &ptr, base);
      if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
            return -1;
      *val = res;
      return 0;
}

int get_u8(__u8 *val, char *arg, int base)
{
      unsigned long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtoul(arg, &ptr, base);
      if (!ptr || ptr == arg || *ptr || res > 0xFF)
            return -1;
      *val = res;
      return 0;
}

int get_s16(__s16 *val, char *arg, int base)
{
      long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtol(arg, &ptr, base);
      if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
            return -1;
      *val = res;
      return 0;
}

int get_s8(__s8 *val, char *arg, int base)
{
      long res;
      char *ptr;

      if (!arg || !*arg)
            return -1;
      res = strtol(arg, &ptr, base);
      if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
            return -1;
      *val = res;
      return 0;
}

int get_addr_1(inet_prefix *addr, char *name, int family)
{
      char *cp;
      unsigned char *ap = (unsigned char*)addr->data;
      int i;

      memset(addr, 0, sizeof(*addr));

      if (strcmp(name, "default") == 0 || strcmp(name, "any") == 0) {
            addr->family = family;
            addr->bytelen = (family == AF_INET6 ? 16 : 4);
            addr->bitlen = -1;
            return 0;
      }

      if (strchr(name, ':')) {
            addr->family = AF_INET6;
            if (family != AF_UNSPEC && family != AF_INET6)
                  return -1;
            if (inet_pton(AF_INET6, name, addr->data) <= 0)
                  return -1;
            addr->bytelen = 16;
            addr->bitlen = -1;
            return 0;
      }

      addr->family = AF_INET;
      if (family != AF_UNSPEC && family != AF_INET)
            return -1;
      addr->bytelen = 4;
      addr->bitlen = -1;
      for (cp=name, i=0; *cp; cp++) {
            if (*cp <= '9' && *cp >= '0') {
                  ap[i] = 10*ap[i] + (*cp-'0');
                  continue;
            }
            if (*cp == '.' && ++i <= 3)
                  continue;
            return -1;
      }
      return 0;
}

int get_prefix_1(inet_prefix *dst, char *arg, int family)
{
      int err;
      unsigned plen;
      char *slash;

      memset(dst, 0, sizeof(*dst));

      if (strcmp(arg, "default") == 0 || strcmp(arg, "any") == 0) {
            dst->family = family;
            dst->bytelen = 0;
            dst->bitlen = 0;
            return 0;
      }

      slash = strchr(arg, '/');
      if (slash)
            *slash = 0;
      err = get_addr_1(dst, arg, family);
      if (err == 0) {
            dst->bitlen = (dst->family == AF_INET6 ? 128 : 32);
            if (slash) {
                  if (scan_number(slash+1, &plen) || plen > dst->bitlen) {
                        err = -1;
                        goto done;
                  }
                  dst->bitlen = plen;
            }
      }
done:
      if (slash)
            *slash = '/';
      return err;
}

int get_addr(inet_prefix *dst, char *arg, int family)
{
      if (get_addr_1(dst, arg, family)) {
            fprintf(stderr, _("ip: %s is invalid inet address\n"), arg);
            exit(1);
      }
      return 0;
}

int get_prefix(inet_prefix *dst, char *arg, int family)
{
      if (get_prefix_1(dst, arg, family)) {
            fprintf(stderr, _("ip: %s is invalid inet prefix\n"), arg);
            exit(1);
      }
      return 0;
}

__u32 get_addr32(char *name)
{
      inet_prefix addr;
      if (get_addr_1(&addr, name, AF_INET)) {
            fprintf(stderr, _("ip: %s is invalid IPv4 address\n"), name);
            exit(1);
      }
      return addr.data[0];
}

void invarg(char *msg)
{
      fprintf(stderr, _("ip: argument is wrong: %s\n"), msg);
      exit(1);
}

int matches(char *cmd, char *pattern)
{
      int len = strlen(cmd);
      if (len > strlen(pattern))
            return -1;
      return memcmp(pattern, cmd, len);
}

int inet_addr_match(inet_prefix *a, inet_prefix *b, int bits)
{
      __u32 *a1 = a->data;
      __u32 *a2 = b->data;
      int words = bits >> 0x05;

      bits &= 0x1f;

      if (words)
            if (memcmp(a1, a2, words << 2))
                  return -1;

      if (bits) {
            __u32 w1, w2;
            __u32 mask;

            w1 = a1[words];
            w2 = a2[words];

            mask = htonl((0xffffffff) << (0x20 - bits));

            if ((w1 ^ w2) & mask)
                  return 1;
      }

      return 0;
}

const char *format_host(int af, void *addr, __u8 *abuf, int alen)
{
#ifdef RESOLVE_HOSTNAMES
      if (resolve_hosts) {
            int addrlen = 0;
            struct hostent *h_ent;
            switch (af) {
            case AF_INET:
                  addrlen = 4;
                  break;
            case AF_INET6:
                  addrlen = 16;
                  break;
            }
            if (addrlen &&
                (h_ent = gethostbyaddr(addr, addrlen, af)) != NULL) {
                  snprintf(abuf, alen-1, "%s", h_ent->h_name);
                  return abuf;
            }
      }
#endif
      return inet_ntop(af, addr, abuf, alen);
}

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