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#! /usr/bin/env lua
local M = require 'posix.sys.socket'
if M.SOCK_RAW and M.SO_BINDTODEVICE then
-- Open raw socket
local fd, err = M.socket(M.AF_INET, M.SOCK_RAW, M.IPPROTO_ICMP)
assert(fd, err)
-- Optionally, bind to specific device
local ok, err = M.setsockopt(fd, M.SOL_SOCKET, M.SO_BINDTODEVICE, 'wlan0')
assert(ok, err)
-- Create raw ICMP echo (ping) message
local data = string.char(0x08, 0x00, 0x89, 0x98, 0x6e, 0x63, 0x00, 0x04, 0x00)
-- Send message
local ok, err = M.sendto(fd, data, {family=M.AF_INET, addr='8.8.8.8', port=0})
assert(ok, err)
-- Read reply
local data, sa = M.recvfrom(fd, 1024)
assert(data, sa)
if data then
print('Received ICMP message from ' .. sa.addr)
end
end
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