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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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<hr><p align="left"><small> scz 于 2001-7-16 11:24:47 加贴在 绿盟科技论坛(bbs.nsfocus.com)--UNIX系统安全： <br>
#include <stdio.h> <br>
#include <stdlib.h> <br>
#include <string.h> <br>
#include <errno.h> <br>
#include <unistd.h> <br>
#include <sys/socket.h> <br>
#include <sys/ioctl.h> <br>
#include <net/if.h> <br>
#include <net/if_arp.h> <br>
#include <arpa/inet.h> <br>
#define inaddrr( x ) ( *( struct in_addr * )&ifr->x[ sizeof( sa.sin_port ) ] ) <br>
#define IFRSIZE ( ( int )( size * sizeof( struct ifreq ) ) ) <br>
int main ( void ) <br>
{ <br>
unsigned char * u; <br>
int sockfd, size = 1; <br>
struct ifreq * ifr; <br>
struct ifconf ifc; <br>
struct sockaddr_in sa; <br>
if ( 0 > ( sockfd = socket( AF_INET, SOCK_DGRAM, IPPROTO_IP ) ) ) <br>
{ <br>
fprintf( stderr, "Cannot open socket.\n" ); <br>
exit( EXIT_FAILURE ); <br>
} <br>
ifc.ifc_req = NULL; <br>
do <br>
{ <br>
++size; <br>
/* realloc buffer size until no overflow occurs */ <br>
if ( NULL == ( ifc.ifc_req = realloc( ifc.ifc_req, IFRSIZE ) ) ) <br>
{ <br>
fprintf( stderr, "Out of memory.\n" ); <br>
exit( EXIT_FAILURE ); <br>
} <br>
ifc.ifc_len = IFRSIZE; <br>
if ( ioctl( sockfd, SIOCGIFCONF, &ifc ) ) <br>
{ <br>
perror( "ioctl SIOCFIFCONF" ); <br>
exit( EXIT_FAILURE ); <br>
} <br>
} while ( IFRSIZE <= ifc.ifc_len ); <br>
ifr = ifc.ifc_req; <br>
for ( ; ( char * )ifr < ( char * )ifc.ifc_req + ifc.ifc_len; ++ifr ) <br>
{ <br>
{ <br>
if ( ifr->ifr_addr.sa_data == ( ifr + 1 )->ifr_addr.sa_data ) <br>
{ <br>
continue; /* duplicate, skip it */ <br>
} <br>
if ( ioctl( sockfd, SIOCGIFFLAGS, ifr ) ) <br>
{ <br>
continue; /* failed to get flags, skip it */ <br>
} <br>
printf( "Interface: %s\n", ifr->ifr_name ); <br>
if ( 0 == ioctl( sockfd, SIOCGIFHWADDR, ifr ) ) <br>
{ <br>
switch ( ifr->ifr_hwaddr.sa_family ) <br>
{ <br>
case ARPHRD_NETROM: <br>
case ARPHRD_ETHER: <br>
case ARPHRD_PPP: <br>
case ARPHRD_EETHER: <br>
case ARPHRD_IEEE802: <br>
break; <br>
default: <br>
printf( "\n" ); <br>
continue; <br>
} <br>
u = ( unsigned char * )&ifr->ifr_addr.sa_data; <br>
if ( u[0] + u[1] + u[2] + u[3] + u[4] + u[5] ) <br>
{ <br>
printf( "HW Address: %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n", <br>
u[0], u[1], u[2], u[3], u[4], u[5] ); <br>
} <br>
} <br>
printf( "\n" ); <br>
} /* end of for */ <br>
close( sockfd ); <br>
return( EXIT_SUCCESS ); <br>
} <br>
</small><hr>
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