54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
#define _GNU_SOURCE /* To get defns of NI_MAXSERV and NI_MAXHOST */
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#include <ifaddrs.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <ifaddrs.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <linux/if_link.h>
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#include <string.h>
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char * get_if_addr(char *ifname)
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{
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struct ifaddrs * list, * plist;
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int family, s;
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char host[NI_MAXHOST];
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char *result;
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if (getifaddrs (&list)==-1)
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{
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fprintf(stderr, "no info");
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return NULL;
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}
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plist = list;
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while (plist!=NULL)
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{
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if (strcmp(plist->ifa_name,ifname)==0)
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{
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family = plist->ifa_addr->sa_family;
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if (family == AF_INET || family == AF_INET6) {
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s = getnameinfo(plist->ifa_addr,
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(family == AF_INET) ? sizeof(struct sockaddr_in) :
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sizeof(struct sockaddr_in6),
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host, NI_MAXHOST,
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NULL, 0, NI_NUMERICHOST);
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if (s != 0) {
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fprintf(stderr, "getnameinfo() failed: %s\n", gai_strerror(s));
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exit(EXIT_FAILURE);
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}
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result = malloc(strlen(host)+1);
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strcpy(result,host);
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freeifaddrs (list);
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return result;
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}
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}
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plist = plist->ifa_next;
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}
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freeifaddrs (list);
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return NULL;
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}
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