Blame examples/ping.lua

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