mdw@git.distorted.org.uk Git - secnet/blob - ipaddr.c

   1 #include "secnet.h"
   2 #include <stdio.h>
   3
   4 /* This file should eventually incorporate all the functionality of
   5    ipaddr.py */
   6
   7 bool_t subnet_match(struct subnet *s, uint32_t address)
   8 {
   9     return (s->prefix==(address&s->mask));
  10 }
  11
  12 bool_t subnet_matches_list(struct subnet_list *list, uint32_t address)
  13 {
  14     uint32_t i;
  15     for (i=0; i<list->entries; i++) {
  16         if (list->list[i].prefix == (address&list->list[i].mask)) return True;
  17     }
  18     return False;
  19 }
  20
  21 bool_t subnets_intersect(struct subnet a, struct subnet b)
  22 {
  23     uint32_t mask=a.mask&b.mask;
  24     return ((a.prefix&mask)==(b.prefix&mask));
  25 }
  26
  27 bool_t subnet_intersects_with_list(struct subnet a, struct subnet_list *b)
  28 {
  29     uint32_t i;
  30
  31     for (i=0; i<b->entries; i++) {
  32         if (subnets_intersect(a,b->list[i])) return True;
  33     }
  34     return False;
  35 }
  36
  37 bool_t subnet_lists_intersect(struct subnet_list *a, struct subnet_list *b)
  38 {
  39     uint32_t i;
  40     for (i=0; i<a->entries; i++) {
  41         if (subnet_intersects_with_list(a->list[i],b)) return True;
  42     }
  43     return False;
  44 }
  45
  46 /* The string buffer must be at least 16 bytes long */
  47 string_t ipaddr_to_string(uint32_t addr)
  48 {
  49     uint8_t a,b,c,d;
  50     string_t s;
  51
  52     s=safe_malloc(16,"ipaddr_to_string");
  53     a=addr>>24;
  54     b=addr>>16;
  55     c=addr>>8;
  56     d=addr;
  57     snprintf(s, 16, "%d.%d.%d.%d", a, b, c, d);
  58     return s;
  59 }
  60
  61 string_t subnet_to_string(struct subnet *sn)
  62 {
  63     uint32_t mask=sn->mask, addr=sn->prefix;
  64     uint8_t a,b,c,d;
  65     string_t s;
  66     int i;
  67
  68     s=safe_malloc(19,"subnet_to_string");
  69     a=addr>>24;
  70     b=addr>>16;
  71     c=addr>>8;
  72     d=addr;
  73     for (i=0; mask; i++) {
  74         mask=(mask<<1);
  75     }
  76     if (i!=sn->len) {
  77         fatal("subnet_to_string: invalid subnet structure "
  78               "(i=%d sn->len=%d mask=0x%08x)!\n",i,sn->len,sn->mask);
  79     }
  80     snprintf(s, 19, "%d.%d.%d.%d/%d", a, b, c, d, sn->len);
  81     return s;
  82 }