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// vim:ts=4:sw=4:expandtab
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <ifaddrs.h>
#include <net/if.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, int family) {
static char part[512];
socklen_t len = 0;
if (family == AF_INET)
len = sizeof(struct sockaddr_in);
else if (family == AF_INET6)
len = sizeof(struct sockaddr_in6);
memset(part, 0, sizeof(part));
struct ifaddrs *ifaddr, *addrp;
bool found = false;
int interface_len = strlen(interface);
getifaddrs(&ifaddr);
if (ifaddr == NULL)
return NULL;
/* Skip until we are at the input family address of interface */
for (addrp = ifaddr; addrp != NULL; addrp = addrp->ifa_next) {
if (strncmp(addrp->ifa_name, interface, interface_len) != 0) {
/* The interface does not have the right name, skip it. */
continue;
}
if (addrp->ifa_addr != NULL && addrp->ifa_addr->sa_family == family) {
/* We found the right interface with the right address. */
break;
}
/* Check if the interface is down. If it is, no need to look any
* further. */
if ((addrp->ifa_flags & IFF_RUNNING) == 0) {
freeifaddrs(ifaddr);
return NULL;
}
found = true;
}
if (addrp == NULL) {
freeifaddrs(ifaddr);
return (found ? "no IP" : NULL);
}
int ret;
if ((ret = getnameinfo(addrp->ifa_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
fprintf(stderr, "i3status: getnameinfo(): %s\n", gai_strerror(ret));
freeifaddrs(ifaddr);
return "no IP";
}
freeifaddrs(ifaddr);
return part;
}
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