Created
December 19, 2013 09:47
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Ruby Raw Socket on Linux (ruby 1.9.3, linux x86_64)
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require 'socket' | |
ETH_P_ALL = 0x0300 # linux/if_ether.h(network byte order) | |
SIOCGIFINDEX = 0x8933 # bits/ioctls.h | |
SOL_PACKET = 0x0107 # bits/socket.h | |
PACKET_ADD_MEMBERSHIP = 0x0001 # netpacket/packet.h | |
PACKET_MR_PROMISC = 0x0001 # netpacket/packet.h | |
IFREQ_SIZE = 0x0028 # sizeof(ifreq) on 64bit | |
IFINDEX_SIZE = 0x0004 # sizeof(ifreq.ifr_ifindex) on 64bit | |
SOCKADDR_LL_SIZE = 0x0014 # sizeof(sockaddr_ll) on 64bit | |
PACKET_MREQ_SIZE = 0x0010 # sizeof(packet_mreq) on 64bit | |
# listen interface name | |
if_name = 'eth0' | |
# open raw socket | |
socket = Socket.open(Socket::PF_PACKET, Socket::SOCK_RAW, ETH_P_ALL) | |
# get interface number | |
ifreq = [if_name].pack('a' + IFREQ_SIZE.to_s) | |
socket.ioctl(SIOCGIFINDEX, ifreq) | |
if_num = ifreq[Socket::IFNAMSIZ, IFINDEX_SIZE] | |
# bind | |
sll = [Socket::AF_PACKET].pack('s') | |
sll << [ETH_P_ALL].pack('s') | |
sll << if_num | |
sll << ("\x00" * (SOCKADDR_LL_SIZE - sll.length)) | |
socket.bind sll | |
# set promiscuous mode | |
mreq = if_num.dup | |
mreq << [PACKET_MR_PROMISC].pack('s') | |
mreq << ("\x00" * (PACKET_MREQ_SIZE - mreq.length)) | |
socket.setsockopt(SOL_PACKET, PACKET_ADD_MEMBERSHIP, mreq) | |
# receive packet | |
data = socket.recvfrom(1024*4) |
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#include <stdio.h> | |
#include <sys/ioctl.h> | |
#include <arpa/inet.h> | |
#include <net/ethernet.h> | |
#include <net/if.h> | |
#include <netpacket/packet.h> | |
int main(int argc, char **argv) { | |
struct ifreq ifr; | |
struct sockaddr_ll sll; | |
struct packet_mreq mreq; | |
printf("ETH_P_ALL = %#06x\n", htons(ETH_P_ALL)); | |
printf("SIOCGIFINDEX = %#06x\n", SIOCGIFINDEX); | |
printf("SOL_PACKET = %#06x\n", SOL_PACKET); | |
printf("PACKET_ADD_MEMBERSHIP = %#06x\n", PACKET_ADD_MEMBERSHIP); | |
printf("PACKET_MR_PROMISC = %#06x\n", PACKET_MR_PROMISC); | |
printf("IFREQ_SIZE = %#06zx\n", sizeof(ifr)); | |
printf("IFINDEX_SIZE = %#06zx\n", sizeof(ifr.ifr_ifindex)); | |
printf("SOCKADDR_LL_SIZE = %#06zx\n", sizeof(sll)); | |
printf("PACKET_MREQ_SIZE = %#06zx\n", sizeof(mreq)); | |
return 0; | |
} |
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