143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/* $Id: getifaddr.c,v 1.11 2011/05/15 08:59:27 nanard Exp $ */
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/* MiniUPnP project
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* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
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* (c) 2006-2011 Thomas Bernard
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* This software is subject to the conditions detailed
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* in the LICENCE file provided within the distribution */
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#if defined(sun)
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#include <sys/sockio.h>
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#endif
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#include "config.h"
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#include "getifaddr.h"
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#if defined(USE_GETIFADDRS) || defined(ENABLE_IPV6)
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#include <ifaddrs.h>
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#endif
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int
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getifaddr(const char * ifname, char * buf, int len)
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{
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#ifndef USE_GETIFADDRS
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/* use ioctl SIOCGIFADDR. Works only for ip v4 */
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/* SIOCGIFADDR struct ifreq * */
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int s;
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struct ifreq ifr;
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int ifrlen;
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struct sockaddr_in * addr;
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ifrlen = sizeof(ifr);
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if(!ifname || ifname[0]=='\0')
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return -1;
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s = socket(PF_INET, SOCK_DGRAM, 0);
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if(s < 0)
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{
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syslog(LOG_ERR, "socket(PF_INET, SOCK_DGRAM): %m");
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return -1;
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}
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strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0)
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{
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syslog(LOG_ERR, "ioctl(s, SIOCGIFADDR, ...): %m");
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close(s);
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return -1;
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}
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addr = (struct sockaddr_in *)&ifr.ifr_addr;
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if(!inet_ntop(AF_INET, &addr->sin_addr, buf, len))
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{
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syslog(LOG_ERR, "inet_ntop(): %m");
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close(s);
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return -1;
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}
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close(s);
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#else /* ifndef USE_GETIFADDRS */
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/* Works for all address families (both ip v4 and ip v6) */
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struct ifaddrs * ifap;
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struct ifaddrs * ife;
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if(!ifname || ifname[0]=='\0')
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return -1;
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if(getifaddrs(&ifap)<0)
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{
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syslog(LOG_ERR, "getifaddrs: %m");
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return -1;
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}
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for(ife = ifap; ife; ife = ife->ifa_next)
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{
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/* skip other interfaces */
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if(0 != strcmp(ifname, ife->ifa_name))
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continue;
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switch(ife->ifa_addr->sa_family)
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{
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case AF_INET:
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inet_ntop(ife->ifa_addr->sa_family,
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&((struct sockaddr_in *)ife->ifa_addr)->sin_addr,
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buf, len);
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break;
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/*
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case AF_INET6:
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inet_ntop(ife->ifa_addr->sa_family,
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&((struct sockaddr_in6 *)ife->ifa_addr)->sin6_addr,
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buf, len);
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*/
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}
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}
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freeifaddrs(ifap);
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#endif
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return 0;
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}
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#ifdef ENABLE_IPV6
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int
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find_ipv6_addr(const char * ifname,
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char * dst, int n)
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{
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struct ifaddrs * ifap;
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struct ifaddrs * ife;
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const struct sockaddr_in6 * addr;
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char buf[64];
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int r = 0;
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if(!dst)
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return -1;
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if(getifaddrs(&ifap)<0)
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{
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syslog(LOG_ERR, "getifaddrs: %m");
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return -1;
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}
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for(ife = ifap; ife; ife = ife->ifa_next)
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{
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/* skip other interfaces if one was specified */
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if(ifname && (0 != strcmp(ifname, ife->ifa_name)))
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continue;
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if(ife->ifa_addr->sa_family == AF_INET6)
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{
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addr = (const struct sockaddr_in6 *)ife->ifa_addr;
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if(!IN6_IS_ADDR_LOOPBACK(&addr->sin6_addr)
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&& !IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr))
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{
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inet_ntop(ife->ifa_addr->sa_family,
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&addr->sin6_addr,
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buf, sizeof(buf));
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/* add brackets */
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snprintf(dst, n, "[%s]", buf);
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r = 1;
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}
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}
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}
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return r;
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}
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#endif
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