luaposix 36.2.1

• Index

Examples

• abstract-ns-client.lua
• abstract-ns-server.lua
• dir.lua
• dup2.lua
• fork.lua
• fork2.lua
• getopt.lua
• glob.lua
• limit.lua
• lock.lua
• netlink-uevent.lua
• packet-socket.lua
• ping.lua
• poll.lua
• rt_sched.lua
• signal.lua
• socket.lua
• termios.lua
• tree.lua

Modules

• posix
• posix.ctype
• posix.dirent
• posix.errno
• posix.fcntl
• posix.fnmatch
• posix.glob
• posix.grp
• posix.libgen
• posix.poll
• posix.pwd
• posix.sched
• posix.signal
• posix.stdio
• posix.stdlib
• posix.sys.msg
• posix.sys.resource
• posix.sys.socket
• posix.sys.stat
• posix.sys.statvfs
• posix.sys.time
• posix.sys.times
• posix.sys.utsname
• posix.sys.wait
• posix.syslog
• posix.termio
• posix.time
• posix.unistd
• posix.utime

ping.lua

#! /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