components/ip.c
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/* See LICENSE file for copyright and license details. */
#if defined(__OpenBSD__)
#include <sys/types.h>
#include <sys/socket.h>
#endif
#include <errno.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include "../util.h"
const char *
ipv4(const char *iface)
{
struct ifaddrs *ifaddr, *ifa;
int s;
char host[NI_MAXHOST];
if (getifaddrs(&ifaddr) == -1) {
fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
return NULL;
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL) {
continue;
}
s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET)) {
if (s != 0) {
fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
return NULL;
}
return bprintf("%s", host);
}
}
freeifaddrs(ifaddr);
return NULL;
}
const char *
ipv6(const char *iface)
{
struct ifaddrs *ifaddr, *ifa;
int s;
char host[NI_MAXHOST];
if (getifaddrs(&ifaddr) == -1) {
fprintf(stderr, "getifaddrs: %s\n", strerror(errno));
return NULL;
}
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL) {
continue;
}
s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
if ((strcmp(ifa->ifa_name, iface) == 0) && (ifa->ifa_addr->sa_family == AF_INET6)) {
if (s != 0) {
fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
return NULL;
}
return bprintf("%s", host);
}
}
freeifaddrs(ifaddr);
return NULL;
}