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getifaddr.c    180 lines (164 with data), 3.8 kB

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/* $Id$ */
/* 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 <stdio.h>
#include <stdlib.h>
#include <string.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>
#include <netdb.h>
#include <errno.h>
#if defined(sun)
#include <sys/sockio.h>
#endif
#include "getifaddr.h"
#include "log.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)
{
DPRINTF(E_ERROR, L_GENERAL, "socket(PF_INET, SOCK_DGRAM): %s\n", strerror(errno));
return -1;
}
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0)
{
DPRINTF(E_ERROR, L_GENERAL, "ioctl(s, SIOCGIFADDR, ...): %s\n", strerror(errno));
close(s);
return -1;
}
addr = (struct sockaddr_in *)&ifr.ifr_addr;
if(!inet_ntop(AF_INET, &addr->sin_addr, buf, len))
{
DPRINTF(E_ERROR, L_GENERAL, "inet_ntop(): %s\n", strerror(errno));
close(s);
return -1;
}
close(s);
return 0;
}
int
getsysaddr(char * buf, int len)
{
int i;
int s = socket(PF_INET, SOCK_STREAM, 0);
struct sockaddr_in addr;
struct ifreq ifr;
int ret = -1;
for (i=1; i > 0; i++)
{
ifr.ifr_ifindex = i;
if( ioctl(s, SIOCGIFNAME, &ifr) < 0 )
break;
if(ioctl(s, SIOCGIFADDR, &ifr, sizeof(struct ifreq)) < 0)
continue;
memcpy(&addr, &ifr.ifr_addr, sizeof(addr));
if(strncmp(inet_ntoa(addr.sin_addr), "127.", 4) == 0)
continue;
if(!inet_ntop(AF_INET, &addr.sin_addr, buf, len))
{
DPRINTF(E_ERROR, L_GENERAL, "inet_ntop(): %s\n", strerror(errno));
close(s);
break;
}
ret = 0;
break;
}
close(s);
return(ret);
}
int
getsyshwaddr(char * buf, int len)
{
struct if_nameindex *ifaces, *if_idx;
unsigned char mac[6];
struct ifreq ifr;
int fd;
int ret = -1;
memset(&mac, '\0', sizeof(mac));
/* Get the spatially unique node identifier */
fd = socket(AF_INET, SOCK_DGRAM, 0);
if( fd < 0 )
return(ret);
ifaces = if_nameindex();
if(!ifaces)
return(ret);
for(if_idx = ifaces; if_idx->if_index; if_idx++)
{
strncpy(ifr.ifr_name, if_idx->if_name, IFNAMSIZ);
if(ioctl(fd, SIOCGIFFLAGS, &ifr) < 0)
continue;
if(ifr.ifr_ifru.ifru_flags & IFF_LOOPBACK)
continue;
if( ioctl(fd, SIOCGIFHWADDR, &ifr) < 0 )
continue;
if( MACADDR_IS_ZERO(&ifr.ifr_hwaddr.sa_data) )
continue;
ret = 0;
break;
}
if_freenameindex(ifaces);
close(fd);
if(ret == 0)
{
if(len > 12)
{
memmove(mac, ifr.ifr_hwaddr.sa_data, 6);
sprintf(buf, "%02x%02x%02x%02x%02x%02x",
mac[0]&0xFF, mac[1]&0xFF, mac[2]&0xFF,
mac[3]&0xFF, mac[4]&0xFF, mac[5]&0xFF);
}
else if(len == 6)
{
memmove(buf, ifr.ifr_hwaddr.sa_data, 6);
}
}
return ret;
}
int
get_remote_mac(struct in_addr ip_addr, unsigned char * mac)
{
struct in_addr arp_ent;
FILE * arp;
char remote_ip[16];
int matches, hwtype, flags;
memset(mac, 0xFF, 6);
arp = fopen("/proc/net/arp", "r");
if( !arp )
return 1;
while( !feof(arp) )
{
matches = fscanf(arp, "%s 0x%X 0x%X %hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
remote_ip, &hwtype, &flags,
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]);
if( matches != 9 )
continue;
inet_pton(AF_INET, remote_ip, &arp_ent);
if( ip_addr.s_addr == arp_ent.s_addr )
break;
mac[0] = 0xFF;
}
fclose(arp);
if( mac[0] == 0xFF )
{
memset(mac, 0xFF, 6);
return 1;
}
return 0;
}