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1.8

    1: /* $Id: getifaddr.c,v 1.1.1.3 2013/07/22 00:32:35 misho Exp $ */
    2: /* MiniUPnP project
    3:  * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
    4:  * (c) 2006-2011 Thomas Bernard
    5:  * This software is subject to the conditions detailed
    6:  * in the LICENCE file provided within the distribution */
    7: 
    8: #include <stdio.h>
    9: #include <string.h>
   10: #include <syslog.h>
   11: #include <unistd.h>
   12: #include <sys/ioctl.h>
   13: #include <sys/types.h>
   14: #include <sys/socket.h>
   15: #include <net/if.h>
   16: #include <netinet/in.h>
   17: #include <arpa/inet.h>
   18: #if defined(sun)
   19: #include <sys/sockio.h>
   20: #endif
   21: 
   22: #include "config.h"
   23: #include "getifaddr.h"
   24: #if defined(USE_GETIFADDRS) || defined(ENABLE_IPV6)
   25: #include <ifaddrs.h>
   26: #endif
   27: 
   28: int
   29: getifaddr(const char * ifname, char * buf, int len)
   30: {
   31: #ifndef USE_GETIFADDRS
   32: 	/* use ioctl SIOCGIFADDR. Works only for ip v4 */
   33: 	/* SIOCGIFADDR struct ifreq *  */
   34: 	int s;
   35: 	struct ifreq ifr;
   36: 	int ifrlen;
   37: 	struct sockaddr_in * addr;
   38: 	ifrlen = sizeof(ifr);
   39: 
   40: 	if(!ifname || ifname[0]=='\0')
   41: 		return -1;
   42: 	s = socket(PF_INET, SOCK_DGRAM, 0);
   43: 	if(s < 0)
   44: 	{
   45: 		syslog(LOG_ERR, "socket(PF_INET, SOCK_DGRAM): %m");
   46: 		return -1;
   47: 	}
   48: 	strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
   49: 	if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0)
   50: 	{
   51: 		syslog(LOG_ERR, "ioctl(s, SIOCGIFADDR, ...): %m");
   52: 		close(s);
   53: 		return -1;
   54: 	}
   55: 	addr = (struct sockaddr_in *)&ifr.ifr_addr;
   56: 	if(!inet_ntop(AF_INET, &addr->sin_addr, buf, len))
   57: 	{
   58: 		syslog(LOG_ERR, "inet_ntop(): %m");
   59: 		close(s);
   60: 		return -1;
   61: 	}
   62: 	close(s);
   63: #else /* ifndef USE_GETIFADDRS */
   64: 	/* Works for all address families (both ip v4 and ip v6) */
   65: 	struct ifaddrs * ifap;
   66: 	struct ifaddrs * ife;
   67: 
   68: 	if(!ifname || ifname[0]=='\0')
   69: 		return -1;
   70: 	if(getifaddrs(&ifap)<0)
   71: 	{
   72: 		syslog(LOG_ERR, "getifaddrs: %m");
   73: 		return -1;
   74: 	}
   75: 	for(ife = ifap; ife; ife = ife->ifa_next)
   76: 	{
   77: 		/* skip other interfaces if one was specified */
   78: 		if(ifname && (0 != strcmp(ifname, ife->ifa_name)))
   79: 			continue;
   80: 		if(ife->ifa_addr == NULL)
   81: 			continue;
   82: 		switch(ife->ifa_addr->sa_family)
   83: 		{
   84: 		case AF_INET:
   85: 			inet_ntop(ife->ifa_addr->sa_family,
   86: 			          &((struct sockaddr_in *)ife->ifa_addr)->sin_addr,
   87: 			          buf, len);
   88: 			break;
   89: /*
   90: 		case AF_INET6:
   91: 			inet_ntop(ife->ifa_addr->sa_family,
   92: 			          &((struct sockaddr_in6 *)ife->ifa_addr)->sin6_addr,
   93: 			          buf, len);
   94: */
   95: 		}
   96: 	}
   97: 	freeifaddrs(ifap);
   98: #endif
   99: 	return 0;
  100: }
  101: 
  102: #ifdef ENABLE_IPV6
  103: int
  104: find_ipv6_addr(const char * ifname,
  105:                char * dst, int n)
  106: {
  107: 	struct ifaddrs * ifap;
  108: 	struct ifaddrs * ife;
  109: 	const struct sockaddr_in6 * addr;
  110: 	char buf[64];
  111: 	int r = 0;
  112: 
  113: 	if(!dst)
  114: 		return -1;
  115: 
  116: 	if(getifaddrs(&ifap)<0)
  117: 	{
  118: 		syslog(LOG_ERR, "getifaddrs: %m");
  119: 		return -1;
  120: 	}
  121: 	for(ife = ifap; ife; ife = ife->ifa_next)
  122: 	{
  123: 		/* skip other interfaces if one was specified */
  124: 		if(ifname && (0 != strcmp(ifname, ife->ifa_name)))
  125: 			continue;
  126: 		if(ife->ifa_addr == NULL)
  127: 			continue;
  128: 		if(ife->ifa_addr->sa_family == AF_INET6)
  129: 		{
  130: 			addr = (const struct sockaddr_in6 *)ife->ifa_addr;
  131: 			if(!IN6_IS_ADDR_LOOPBACK(&addr->sin6_addr)
  132: 			   && !IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr))
  133: 			{
  134: 				inet_ntop(ife->ifa_addr->sa_family,
  135: 				          &addr->sin6_addr,
  136: 				          buf, sizeof(buf));
  137: 				/* add brackets */
  138: 				snprintf(dst, n, "[%s]", buf);
  139: 				r = 1;
  140: 			}
  141: 		}
  142: 	}
  143: 	freeifaddrs(ifap);
  144: 	return r;
  145: }
  146: #endif
  147: