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miniupnpd

    1: /* $Id: getifaddr.c,v 1.1.1.1 2012/02/21 23:16:02 misho Exp $ */
    2: /* MiniUPnP project
    3:  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
    4:  * (c) 2006-2008 Thomas Bernard 
    5:  * This software is subject to the conditions detailed
    6:  * in the LICENCE file provided within the distribution */
    7: 
    8: #include <string.h>
    9: #include <syslog.h>
   10: #include <unistd.h>
   11: #include <sys/ioctl.h>
   12: #include <sys/types.h>
   13: #include <sys/socket.h>
   14: #include <net/if.h>
   15: #include <arpa/inet.h>
   16: #include <netinet/in.h>
   17: #if defined(sun)
   18: #include <sys/sockio.h>
   19: #endif
   20: 
   21: #include "getifaddr.h"
   22: 
   23: int
   24: getifaddr(const char * ifname, char * buf, int len)
   25: {
   26: 	/* SIOCGIFADDR struct ifreq *  */
   27: 	int s;
   28: 	struct ifreq ifr;
   29: 	int ifrlen;
   30: 	struct sockaddr_in * addr;
   31: 	ifrlen = sizeof(ifr);
   32: 	if(!ifname || ifname[0]=='\0')
   33: 		return -1;
   34: 	s = socket(PF_INET, SOCK_DGRAM, 0);
   35: 	if(s < 0)
   36: 	{
   37: 		syslog(LOG_ERR, "socket(PF_INET, SOCK_DGRAM): %m");
   38: 		return -1;
   39: 	}
   40: 	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
   41: 	if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0)
   42: 	{
   43: 		syslog(LOG_ERR, "ioctl(s, SIOCGIFADDR, ...): %m");
   44: 		close(s);
   45: 		return -1;
   46: 	}
   47: 	addr = (struct sockaddr_in *)&ifr.ifr_addr;
   48: 	if(!inet_ntop(AF_INET, &addr->sin_addr, buf, len))
   49: 	{
   50: 		syslog(LOG_ERR, "inet_ntop(): %m");
   51: 		close(s);
   52: 		return -1;
   53: 	}
   54: 	close(s);
   55: 	return 0;
   56: }
   57: