2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include <arpa/inet.h>

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include "in-addr-util.h"

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_is_null(int family, const union in_addr_union *u) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(u);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return u->in.s_addr == 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET6)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u->in6.s6_addr32[0] == 0 &&

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u->in6.s6_addr32[1] == 0 &&

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u->in6.s6_addr32[2] == 0 &&

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u->in6.s6_addr32[3] == 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EAFNOSUPPORT;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_is_link_local(int family, const union in_addr_union *u) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(u);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return (be32toh(u->in.s_addr) & 0xFFFF0000) == (169U << 24 | 254U << 16);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET6)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return IN6_IS_ADDR_LINKLOCAL(&u->in6);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EAFNOSUPPORT;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(a);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(b);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return a->in.s_addr == b->in.s_addr;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET6)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a->in6.s6_addr32[0] == b->in6.s6_addr32[0] &&

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a->in6.s6_addr32[1] == b->in6.s6_addr32[1] &&

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a->in6.s6_addr32[2] == b->in6.s6_addr32[2] &&

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a->in6.s6_addr32[3] == b->in6.s6_addr32[3];

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EAFNOSUPPORT;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_prefix_intersect(

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek int family,

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek const union in_addr_union *a,

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned aprefixlen,

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek const union in_addr_union *b,

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned bprefixlen) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned m;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(a);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(b);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Checks whether there are any addresses that are in both

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek m = MIN(aprefixlen, bprefixlen);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek uint32_t x, nm;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek x = be32toh(a->in.s_addr ^ b->in.s_addr);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek nm = (m == 0) ? 0 : 0xFFFFFFFFUL << (32 - m);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return (x & nm) == 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET6) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned i;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (m > 128)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek m = 128;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (i = 0; i < 16; i++) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek uint8_t x, nm;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek x = a->in6.s6_addr[i] ^ b->in6.s6_addr[i];

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (m < 8)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek nm = 0xFF << (8 - m);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek nm = 0xFF;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if ((x & nm) != 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (m > 8)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek m -= 8;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek m = 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 1;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EAFNOSUPPORT;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(u);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Increases the network part of an address by one. Returns

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (prefixlen <= 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek uint32_t c, n;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (prefixlen > 32)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek prefixlen = 32;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek c = be32toh(u->in.s_addr);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek n = c + (1UL << (32 - prefixlen));

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (n < c)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek n &= 0xFFFFFFFFUL << (32 - prefixlen);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u->in.s_addr = htobe32(n);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 1;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET6) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek struct in6_addr add = {}, result;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek uint8_t overflow = 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned i;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (prefixlen > 128)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek prefixlen = 128;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* First calculate what we have to add */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek add.s6_addr[(prefixlen-1) / 8] = 1 << (7 - (prefixlen-1) % 8);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (i = 16; i > 0; i--) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned j = i - 1;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek result.s6_addr[j] = u->in6.s6_addr[j] + add.s6_addr[j] + overflow;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek overflow = (result.s6_addr[j] < u->in6.s6_addr[j]);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (overflow)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u->in6 = result;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 1;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EAFNOSUPPORT;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_to_string(int family, const union in_addr_union *u, char **ret) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char *x;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek size_t l;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(u);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(ret);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (family == AF_INET)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek l = INET_ADDRSTRLEN;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else if (family == AF_INET6)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek l = INET6_ADDRSTRLEN;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EAFNOSUPPORT;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek x = new(char, l);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!x)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -ENOMEM;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek errno = 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!inet_ntop(family, u, x, l)) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(x);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return errno ? -errno : -EINVAL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *ret = x;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_from_string(int family, const char *s, union in_addr_union *ret) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(s);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(ret);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!IN_SET(family, AF_INET, AF_INET6))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EAFNOSUPPORT;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek errno = 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (inet_pton(family, s, ret) <= 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return errno ? -errno : -EINVAL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_from_string_auto(const char *s, int *family, union in_addr_union *ret) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek int r;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(s);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(family);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(ret);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = in_addr_from_string(AF_INET, s, ret);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (r >= 0) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *family = AF_INET;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = in_addr_from_string(AF_INET6, s, ret);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (r >= 0) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *family = AF_INET6;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EINVAL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekunsigned in_addr_netmask_to_prefixlen(const struct in_addr *addr) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(addr);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 32 - u32ctz(be32toh(addr->s_addr));

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek uint32_t address;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(addr);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(addr->s_addr != INADDR_ANY);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(prefixlen);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek address = be32toh(addr->s_addr);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if ((address >> 31) == 0x0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* class A, leading bits: 0 */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *prefixlen = 8;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else if ((address >> 30) == 0x2)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* class B, leading bits 10 */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *prefixlen = 16;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else if ((address >> 29) == 0x6)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* class C, leading bits 110 */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *prefixlen = 24;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* class D or E, no default prefixlen */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -ERANGE;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint in_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned char prefixlen;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek int r;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(addr);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(mask);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = in_addr_default_prefixlen(addr, &prefixlen);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (r < 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return r;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(prefixlen > 0 && prefixlen < 32);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek mask->s_addr = htobe32((0xffffffff << (32 - prefixlen)) & 0xffffffff);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek