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222 lines (210 loc) · 5.07 KB
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/* $Id: getifaddr.c,v 1.19 2013/12/13 14:28:40 nanard Exp $ */
/* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
* (c) 2006-2013 Thomas Bernard
* This software is subject to the conditions detailed
* in the LICENCE file provided within the distribution */
#include <stdio.h>
#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 <netinet/in.h>
#include <arpa/inet.h>
#if defined(sun)
#include <sys/sockio.h>
#endif
#include "config.h"
#include "getifaddr.h"
#if defined(USE_GETIFADDRS) || defined(ENABLE_IPV6) || defined(ENABLE_PCP)
#include <ifaddrs.h>
#endif
int
getifaddr(const char * ifname, char * buf, int len,
struct in_addr * addr, struct in_addr * mask)
{
#ifndef USE_GETIFADDRS
/* use ioctl SIOCGIFADDR. Works only for ip v4 */
/* SIOCGIFADDR struct ifreq * */
int s;
struct ifreq ifr;
int ifrlen;
struct sockaddr_in * ifaddr;
ifrlen = sizeof(ifr);
if(!ifname || ifname[0]=='\0')
return -1;
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;
}
ifaddr = (struct sockaddr_in *)&ifr.ifr_addr;
if(addr) *addr = ifaddr->sin_addr;
if(!inet_ntop(AF_INET, &ifaddr->sin_addr, buf, len))
{
syslog(LOG_ERR, "inet_ntop(): %m");
close(s);
return -1;
}
if(mask)
{
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if(ioctl(s, SIOCGIFNETMASK, &ifr, &ifrlen) < 0)
{
syslog(LOG_ERR, "ioctl(s, SIOCGIFNETMASK, ...): %m");
close(s);
return -1;
}
#ifdef ifr_netmask
*mask = ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr;
#else
*mask = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
#endif
}
close(s);
#else /* ifndef USE_GETIFADDRS */
/* Works for all address families (both ip v4 and ip v6) */
struct ifaddrs * ifap;
struct ifaddrs * ife;
if(!ifname || ifname[0]=='\0')
return -1;
if(getifaddrs(&ifap)<0)
{
syslog(LOG_ERR, "getifaddrs: %m");
return -1;
}
for(ife = ifap; ife; ife = ife->ifa_next)
{
/* skip other interfaces if one was specified */
if(ifname && (0 != strcmp(ifname, ife->ifa_name)))
continue;
if(ife->ifa_addr == NULL)
continue;
switch(ife->ifa_addr->sa_family)
{
case AF_INET:
inet_ntop(ife->ifa_addr->sa_family,
&((struct sockaddr_in *)ife->ifa_addr)->sin_addr,
buf, len);
if(addr) *addr = ((struct sockaddr_in *)ife->ifa_addr)->sin_addr;
if(mask) *mask = ((struct sockaddr_in *)ife->ifa_netmask)->sin_addr;
break;
/*
case AF_INET6:
inet_ntop(ife->ifa_addr->sa_family,
&((struct sockaddr_in6 *)ife->ifa_addr)->sin6_addr,
buf, len);
*/
}
}
freeifaddrs(ifap);
#endif
return 0;
}
#ifdef ENABLE_PCP
int getifaddr_in6(const char * ifname, struct in6_addr * addr){
struct ifaddrs * ifap;
struct ifaddrs * ife;
if(!ifname || ifname[0]=='\0')
return -1;
if(getifaddrs(&ifap)<0)
{
syslog(LOG_ERR, "getifaddrs: %m");
return -1;
}
for(ife = ifap; ife; ife = ife->ifa_next)
{
int found = 0;
/* skip other interfaces if one was specified */
if(ifname && (0 != strcmp(ifname, ife->ifa_name)))
continue;
if(ife->ifa_addr == NULL)
continue;
switch(ife->ifa_addr->sa_family)
{
case AF_INET:
#if 0
addr->s6_addr32[0]=0;
addr->s6_addr32[1]=0;
addr->s6_addr32[2]=htonl(0xffff);
addr->s6_addr32[3]=((struct sockaddr_in *)ife->ifa_addr)->sin_addr.s_addr;
#endif
memset(addr->s6_addr
71EF
, 0, 10);
addr->s6_addr[10] = 0xff;
addr->s6_addr[11] = 0xff;
memcpy(addr->s6_addr + 12, &(((struct sockaddr_in *)ife->ifa_addr)->sin_addr.s_addr), 4);
/*inet_ntop(ife->ifa_addr->sa_family,
&((struct sockaddr_in *)ife->ifa_addr)->sin_addr,
buf, len);*/
found = 1;
break;
case AF_INET6:
if(!IN6_IS_ADDR_LOOPBACK(addr)
&& !IN6_IS_ADDR_LINKLOCAL(addr)) {
memcpy(addr->s6_addr, &((struct sockaddr_in6 *)ife->ifa_addr)->sin6_addr, 16);
found = 1;
}
break;
}
if (found) {
break;
}
}
freeifaddrs(ifap);
return 0;
}
#endif
#ifdef ENABLE_IPV6
int
find_ipv6_addr(const char * ifname,
char * dst, int n)
{
struct ifaddrs * ifap;
struct ifaddrs * ife;
const struct sockaddr_in6 * addr;
char buf[64];
int r = 0;
if(!dst)
return -1;
if(getifaddrs(&ifap)<0)
{
syslog(LOG_ERR, "getifaddrs: %m");
return -1;
}
for(ife = ifap; ife; ife = ife->ifa_next)
{
/* skip other interfaces if one was specified */
if(ifname && (0 != strcmp(ifname, ife->ifa_name)))
continue;
if(ife->ifa_addr == NULL)
continue;
if(ife->ifa_addr->sa_family == AF_INET6)
{
addr = (const struct sockaddr_in6 *)ife->ifa_addr;
if(!IN6_IS_ADDR_LOOPBACK(&addr->sin6_addr)
&& !IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr))
{
inet_ntop(ife->ifa_addr->sa_family,
&addr->sin6_addr,
buf, sizeof(buf));
/* add brackets */
snprintf(dst, n, "[%s]", buf);
r = 1;
}
}
}
freeifaddrs(ifap);
return r;
}
#endif