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network-utils: pw_net_are_addresses_equal() function

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This commit is contained in:
Carlos Rafael Giani 2026-03-30 23:45:08 +02:00
parent 9ba92bd728
commit 41b5bc662e
1 changed files with 58 additions and 0 deletions
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58
src/modules/network-utils.h
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@ -87,6 +87,64 @@ static inline int pw_net_parse_address_port(const char *address,
return pw_net_parse_address(n, port, addr, len); return pw_net_parse_address(n, port, addr, len);
} }
static inline bool pw_net_are_addresses_equal(const struct sockaddr_storage *addr1,
const struct sockaddr_storage *addr2,
bool compare_ports)
{
/* IPv6 addresses might actually be mapped IPv4 ones. In cases where
* such mapped IPv4 addresses are compared against plain IPv4 ones
* (that is, ss_family == AF_INET), special handling is required. */
bool addr1_is_mapped_ipv4 = (addr1->ss_family == AF_INET6) &&
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6*)addr1)->sin6_addr);
bool addr2_is_mapped_ipv4 = (addr2->ss_family == AF_INET6) &&
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6*)addr2)->sin6_addr);
if ((addr1->ss_family == AF_INET) && (addr2->ss_family == AF_INET)) {
/* Both addresses are plain IPv4 addresses. */
const struct sockaddr_in *addr1_in = (const struct sockaddr_in *)addr1;
const struct sockaddr_in *addr2_in = (const struct sockaddr_in *)addr2;
return (!compare_ports || (addr1_in->sin_port == addr2_in->sin_port)) &&
(addr1_in->sin_addr.s_addr == addr2_in->sin_addr.s_addr);
} else if ((addr1->ss_family == AF_INET6) && (addr2->ss_family == AF_INET6)) {
/* Both addresses are IPv6 addresses. (Note that this logic here
* works correctly even if both are actually mapped IPv4 addresses.) */
const struct sockaddr_in6 *addr1_in6 = (const struct sockaddr_in6 *)addr1;
const struct sockaddr_in6 *addr2_in6 = (const struct sockaddr_in6 *)addr2;
return (!compare_ports || (addr1_in6->sin6_port == addr2_in6->sin6_port)) &&
(addr1_in6->sin6_scope_id == addr2_in6->sin6_scope_id) &&
(memcmp(&addr1_in6->sin6_addr, &addr2_in6->sin6_addr, sizeof(struct in6_addr)) == 0);
} else if ((addr1->ss_family == AF_INET) && addr2_is_mapped_ipv4) {
/* addr1 is a plain IPv4 address, addr2 is a mapped IPv4 address.
* Extract the IPv4 portion of addr2 to form a plain IPv4 address
* out of it, then compare the two plain IPv4 addresses. */
struct in_addr addr2_as_ipv4;
const struct sockaddr_in *addr1_in = (const struct sockaddr_in *)addr1;
const struct sockaddr_in6 *addr2_in6 = (const struct sockaddr_in6 *)addr2;
memcpy(&addr2_as_ipv4, &(addr2_in6->sin6_addr.s6_addr[12]), 4);
return (!compare_ports || (addr1_in->sin_port == addr2_in6->sin6_port)) &&
(addr1_in->sin_addr.s_addr == addr2_as_ipv4.s_addr);
} else if (addr1_is_mapped_ipv4 && (addr2->ss_family == AF_INET)) {
/* addr2 is a plain IPv4 address, addr1 is a mapped IPv4 address.
* Extract the IPv4 portion of addr1 to form a plain IPv4 address
* out of it, then compare the two plain IPv4 addresses. */
struct in_addr addr1_as_ipv4;
const struct sockaddr_in6 *addr1_in6 = (const struct sockaddr_in6 *)addr1;
const struct sockaddr_in *addr2_in = (const struct sockaddr_in *)addr2;
memcpy(&addr1_as_ipv4, &(addr1_in6->sin6_addr.s6_addr[12]), 4);
return (!compare_ports || (addr1_in6->sin6_port == addr2_in->sin_port)) &&
(addr1_as_ipv4.s_addr == addr2_in->sin_addr.s_addr);
} else
return false;
}
static inline int pw_net_get_ip(const struct sockaddr_storage *sa, char *ip, size_t len, bool *ip4, uint16_t *port) static inline int pw_net_get_ip(const struct sockaddr_storage *sa, char *ip, size_t len, bool *ip4, uint16_t *port)
{ {
if (ip4) if (ip4)