网卡混杂模式的设置可以通过下面的命令来进行设置:

root@dell-desktop:/home/dell/libppf/bin# ifconfig eth0

eth0 Link encap:Ethernet HWaddr 00:1e:4f:e7:81:16

inet addr:10.0.16.111 Bcast:10.255.255.255 Mask:255.0.0.0

inet6 addr: fe80::21e:4fff:fee7:8116/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1678 errors:0 dropped:0 overruns:0 frame:0

TX packets:63 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:100

RX bytes:164865 (161.0 KB) TX bytes:8362 (8.1 KB)

Base address:0xecc0 Memory:fe9e0000-fea00000

root@dell-desktop:/home/dell/libppf/bin# ifconfig eth0 promisc

root@dell-desktop:/home/dell/libppf/bin# ifconfig eth0

eth0 Link encap:Ethernet HWaddr 00:1e:4f:e7:81:16

inet addr:10.0.16.111 Bcast:10.255.255.255 Mask:255.0.0.0

inet6 addr: fe80::21e:4fff:fee7:8116/64 Scope:Link

UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1

RX packets:1751 errors:0 dropped:0 overruns:0 frame:0

TX packets:63 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:100

RX bytes:169849 (165.8 KB) TX bytes:8362 (8.1 KB)

Base address:0xecc0 Memory:fe9e0000-fea00000

root@dell-desktop:/home/dell/libppf/bin# ifconfig eth0 -promisc

root@dell-desktop:/home/dell/libppf/bin# ifconfig eth0

eth0 Link encap:Ethernet HWaddr 00:1e:4f:e7:81:16

inet addr:10.0.16.111 Bcast:10.255.255.255 Mask:255.0.0.0

inet6 addr: fe80::21e:4fff:fee7:8116/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1815 errors:0 dropped:0 overruns:0 frame:0

TX packets:64 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:100

RX bytes:176114 (171.9 KB) TX bytes:8458 (8.2 KB)

Base address:0xecc0 Memory:fe9e0000-fea00000

程序可以通过IOCTL来实现：

int Set_Promisc(char *interface, int sock ) {

struct ifreq ifr;

strncpy(ifr.ifr_name, interface,strnlen(interface)+1);

if((ioctl(sock, SIOCGIFFLAGS, &ifr) == -1)) {

/*Could not retrieve flags for the interface*/

perror("Could not retrive flags for the interface");

exit(0);

}

printf("The interface is ::: %s\n", interface);

perror("Retrieved flags from interface successfully");

/*now that the flags have been retrieved*/

/* set the flags to PROMISC */

ifr.ifr_flags |= IFF_PROMISC;

if (ioctl (sock, SIOCSIFFLAGS, &ifr) == -1 ) {

/*Could not set the flags on the interface */

perror("Could not set the PROMISC flag:");

exit(0);

}

printf("Setting interface ::: %s ::: to promisc", interface);

return(0);

}

分析ifconfig promisc的实现：

调用