kaguya
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
#include <arpa/inet.h>
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#include <assert.h>
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#include <ifaddrs.h>
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#include <linux/if_link.h>
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#include <net/if.h>
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#include <netdb.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <unistd.h>
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int main(int argc, char *argv[]) {
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(void) argc;
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(void) argv;
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struct ifaddrs *ifaddr = 0;
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char host[NI_MAXHOST];
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bool loopback_found = false;
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if(getifaddrs(&ifaddr)) {
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perror("getifaddrs");
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exit(EXIT_FAILURE);
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}
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for(struct ifaddrs *ifa = ifaddr; ifa; ifa = ifa->ifa_next) {
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if(ifa->ifa_addr == NULL)
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continue;
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int family = ifa->ifa_addr->sa_family;
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if(family == AF_INET && !strcmp("lo", ifa->ifa_name)) {
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loopback_found = true;
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printf("%-10s %s (%d)\n", ifa->ifa_name,
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(family == AF_INET) ? "AF_INET" : (family == AF_INET6) ? "AF_INET6" : "???",
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family
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);
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int s = getnameinfo(ifa->ifa_addr,
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(family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6),
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host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
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assert(!s);
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printf("\t\taddress: <%s>\n", host);
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if(ifa->ifa_netmask)
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printf("\t\tnetmask: <%s>\n", inet_ntoa(((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr));
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if(ifa->ifa_flags & IFF_BROADCAST) {
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assert(ifa->ifa_broadaddr);
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printf("\t\tbroadcast: <%s>\n", inet_ntoa(((struct sockaddr_in *) ifa->ifa_broadaddr)->sin_addr));
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}
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if(ifa->ifa_flags & IFF_POINTOPOINT) {
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assert(ifa->ifa_dstaddr);
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printf("\t\tdest addr: <%s>\n", inet_ntoa(((struct sockaddr_in *) ifa->ifa_dstaddr)->sin_addr));
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}
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}
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}
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freeifaddrs(ifaddr);
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exit(loopback_found ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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