68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
// vim:ts=8:expandtab
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <netdb.h>
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#include <ifaddrs.h>
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#include <net/if.h>
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#include "i3status.h"
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/*
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* Return the IP address for the given interface or "no IP" if the
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* interface is up and running but hasn't got an IP address yet
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*
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*/
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const char *get_ip_addr(const char *interface) {
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static char part[512];
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socklen_t len = sizeof(struct sockaddr_in);
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memset(part, 0, sizeof(part));
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struct ifaddrs *ifaddr, *addrp;
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bool found = false;
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getifaddrs(&ifaddr);
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if (ifaddr == NULL)
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return NULL;
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/* Skip until we are at the AF_INET address of interface */
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for (addrp = ifaddr;
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(addrp != NULL &&
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(strcmp(addrp->ifa_name, interface) != 0 ||
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addrp->ifa_addr == NULL ||
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addrp->ifa_addr->sa_family != AF_INET));
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addrp = addrp->ifa_next) {
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/* Check if the interface is down */
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if (strcmp(addrp->ifa_name, interface) != 0)
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continue;
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found = true;
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if ((addrp->ifa_flags & IFF_RUNNING) == 0) {
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freeifaddrs(ifaddr);
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return NULL;
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}
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}
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if (addrp == NULL) {
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freeifaddrs(ifaddr);
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return (found ? "no IP" : NULL);
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}
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int ret;
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if ((ret = getnameinfo(addrp->ifa_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
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fprintf(stderr, "i3status: getnameinfo(): %s\n", gai_strerror(ret));
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freeifaddrs(ifaddr);
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return "no IP";
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}
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freeifaddrs(ifaddr);
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return part;
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}
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