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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <linux/if_tun.h>
#define max(a,b) ((a)>(b) ? (a):(b))
int main(int argc, char *argv[])
{
char buf[1600];
int f1,f2,l,fm;
fd_set fds;
if(argc < 2) {
printf("Usage: bridge tap|tun\n");
exit(1);
}
sprintf(buf,"/dev/%s%d",argv[1],0);
f1 = open(buf, O_RDWR);
sprintf(buf,"/dev/%s%d",argv[1],1);
f2 = open(buf, O_RDWR);
fm = max(f1, f2) + 1;
ioctl(f1, TUNSETNOCSUM, 1);
ioctl(f2, TUNSETNOCSUM, 1);
while(1){
FD_ZERO(&fds);
FD_SET(f1, &fds);
FD_SET(f2, &fds);
select(fm, &fds, NULL, NULL, NULL);
if( FD_ISSET(f1, &fds) ) {
l = read(f1,buf,sizeof(buf));
write(f2,buf,l);
}
if( FD_ISSET(f2, &fds) ) {
l = read(f2,buf,sizeof(buf));
write(f1,buf,l);
}
}
}
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