转自:www.cublog.cn/u3/104357/showart_2151020.html
#include sys/types.h>
#include stdio.h>
#include unistd.h>
#include sys/socket.h>
#include netinet/in.h>
#include arpa/inet.h>
#include errno.h>
#include linux/if_ether.h>
#include net/if.h>
#include sys/ioctl.h>
#include string.h>
int do_promisc()
{
int f, s;
struct ifreq ifr;
if ((f = socket(AF_INET, SOCK_PACKET, htons(ETH_P_IP))) 0)
return -1;
strcpy(ifr.ifr_name, "eth0");
if ((s = ioctl(f, SIOCGIFFLAGS, &ifr)) 0)
{
close(f);
return-1;
}
ifr.ifr_flags |= IFF_PROMISC;
if ((s = ioctl(f, SIOCSIFFLAGS, &ifr)) 0)
{
return -1;
}
printf("Setting interface ::: %s ::: to promisc\n\n", ifr.ifr_name);
return 0;
}
int main()
{
do_promisc();
return 0;
}
[root@mip-123456 ioctl]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:22:68:3C:9C:F0
inet addr:172.24.149.212 Bcast:172.24.149.255 Mask:255.255.255.0
inet6 addr: fe80::222:68ff:fe3c:9cf0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3643 errors:0 dropped:0 overruns:0 frame:0
TX packets:6629 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6253468 (5.9 MiB) TX bytes:2379136 (2.2 MiB)
Interrupt:233 Base address:0xa000
[root@mip-123456 ioctl]# ./promisc
Setting interface ::: eth0 ::: to promisc
[root@mip-123456 ioctl]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:22:68:3C:9C:F0
inet addr:172.24.149.212 Bcast:172.24.149.255 Mask:255.255.255.0
inet6 addr: fe80::222:68ff:fe3c:9cf0/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:3653 errors:0 dropped:0 overruns:0 frame:0
TX packets:6630 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6255432 (5.9 MiB) TX bytes:2379200 (2.2 MiB)
Interrupt:233 Base address:0xa000
其实可以直接ifconfig eth0 promisc 设置混杂
ifconfig eth0 -promisc 取消混杂
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