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#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include "i3status.h"
/*
* Return the IP address for the given interface or "no IP" if the
* interface is up and running but hasn't got an IP address yet
*
*/
const char *get_ip_addr(const char *interface) {
static char part[512];
struct ifreq ifr;
socklen_t len = sizeof(struct sockaddr_in);
memset(part, 0, sizeof(part));
/* First check if the interface is running */
(void)strcpy(ifr.ifr_name, interface);
if (ioctl(general_socket, SIOCGIFFLAGS, &ifr) < 0 ||
!(ifr.ifr_flags & IFF_RUNNING))
return NULL;
/* Interface is up, get the IP address */
(void)strcpy(ifr.ifr_name, interface);
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl(general_socket, SIOCGIFADDR, &ifr) < 0)
return "no IP";
int ret;
if ((ret = getnameinfo(&ifr.ifr_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
fprintf(stderr, "getnameinfo(): %s\n", gai_strerror(ret));
return "no IP";
}
return part;
}
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