/* $Id$ */

/* MiniUPnP project

* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/

* (c) 2006 Thomas Bernard

* This software is subject to the conditions detailed

* in the LICENCE file provided within the distribution */

#include <string.h>

#include <syslog.h>

#include <unistd.h>

#include <sys/ioctl.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <net/if.h>

#include <arpa/inet.h>

#include <netinet/in.h>

#if defined(sun)

#include <sys/sockio.h>

#endif

#include "getifaddr.h"

int

getifaddr(const char * ifname, char * buf, int len)

{

/* SIOCGIFADDR struct ifreq * */

int s;

struct ifreq ifr;

int ifrlen;

struct sockaddr_in * addr;

ifrlen = sizeof(ifr);

s = socket(PF_INET, SOCK_DGRAM, 0);

if(s < 0)

{

syslog(LOG_ERR, "socket(PF_INET, SOCK_DGRAM): %m");

return -1;

}

strncpy(ifr.ifr_name, ifname, IFNAMSIZ);

if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0)

{

syslog(LOG_ERR, "ioctl(s, SIOCGIFADDR, ...): %m");

close(s);

return -1;

}

addr = (struct sockaddr_in *)&ifr.ifr_addr;

if(!inet_ntop(AF_INET, &addr->sin_addr, buf, len))

{

syslog(LOG_ERR, "inet_ntop(): %m");

close(s);

return -1;

}

close(s);

return 0;

}