57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#if defined(__OpenBSD__)
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#include <sys/types.h>
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#include <sys/socket.h>
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#endif
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#include "../util.h"
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static const char *
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ip(const char *interface, unsigned short sa_family)
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{
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struct ifaddrs *ifaddr, *ifa;
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int s;
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char host[NI_MAXHOST];
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if (getifaddrs(&ifaddr) < 0) {
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warn("getifaddrs:");
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return NULL;
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}
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for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
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if (!ifa->ifa_addr) {
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continue;
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}
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s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in6),
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host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
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if (!strcmp(ifa->ifa_name, interface) &&
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(ifa->ifa_addr->sa_family == sa_family)) {
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freeifaddrs(ifaddr);
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if (s != 0) {
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warn("getnameinfo: %s", gai_strerror(s));
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return NULL;
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}
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return bprintf("%s", host);
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}
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}
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freeifaddrs(ifaddr);
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return NULL;
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}
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const char *
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ipv4(const char *interface)
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{
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return ip(interface, AF_INET);
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}
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const char *
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ipv6(const char *interface)
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{
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return ip(interface, AF_INET6);
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}
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