386 lines
11 KiB
Markdown
386 lines
11 KiB
Markdown
# net Module
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| Since | Origin / Contributor | Maintainer | Source |
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| :----- | :-------------------- | :---------- | :------ |
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| 2014-12-22 | [Zeroday](https://github.com/funshine) | [Zeroday](https://github.com/funshine) | [net.c](../../../app/modules/net.c)|
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## Constants
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Constants to be used in other functions: `net.TCP`, `net.UDP`
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## net.createConnection()
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Creates a client.
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#### Syntax
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`net.createConnection(type, secure)`
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#### Parameters
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- `type` `net.TCP` or `net.UDP`
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- `secure` 1 for encrypted, 0 for plain
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#### Returns
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net.socket sub module
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#### Example
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```lua
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net.createConnection(net.UDP, 0)
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```
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#### See also
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[`net.createServer()`](#netcreateserver)
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## net.createServer()
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Creates a server.
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#### Syntax
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`net.createServer(type, timeout)`
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#### Parameters
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- `type` `net.TCP` or `net.UDP`
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- `timeout` for a TCP server timeout is 1~28'800 seconds (for an inactive client to be disconnected)
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#### Returns
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net.server sub module
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#### Example
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```lua
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net.createServer(net.TCP, 30) -- 30s timeout
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```
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#### See also
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[`net.createConnection()`](#netcreateconnection)
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# net.server Module
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## net.server:close()
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Closes the server.
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#### Syntax
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`net.server.close()`
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#### Parameters
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none
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#### Returns
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`nil`
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#### Example
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```lua
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-- creates a server
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sv = net.createServer(net.TCP, 30)
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-- closes the server
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sv:close()
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```
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#### See also
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[`net.createServer()`](#netcreateserver)
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## net.server:listen()
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Listen on port from IP address.
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#### Syntax
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`net.server.listen(port,[ip],function(net.socket))`
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#### Parameters
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- `port` port number
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- `ip` IP address string, can be omitted
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- `function(net.socket)` callback function, pass to caller function as param if a connection is created successfully
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#### Returns
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`nil`
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#### Example
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```lua
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-- 30s time out for a inactive client
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sv = net.createServer(net.TCP, 30)
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-- server listens on 80, if data received, print data to console and send "hello world" back to caller
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sv:listen(80, function(c)
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c:on("receive", function(c, pl)
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print(pl)
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end)
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c:send("hello world")
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end)
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```
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#### See also
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[`net.createServer()`](#netcreateserver)
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# net.socket Module
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## net.socket:close()
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Closes socket.
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#### Syntax
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`close()`
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#### Parameters
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none
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#### Returns
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`nil`
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#### See also
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[`net.createServer()`](#netcreateserver)
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## net.socket:connect()
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Connect to a remote server.
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#### Syntax
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`connect(port, ip|domain)`
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#### Parameters
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- `port` port number
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- `ip` IP address or domain name string
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#### Returns
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`nil`
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#### See also
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[`net.socket:on()`](#netsocketon)
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## net.socket:dns()
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Provides DNS resolution for a hostname.
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#### Syntax
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`dns(domain, function(net.socket, ip))`
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#### Parameters
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- `domain` domain name
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- `function(net.socket, ip)` callback function. The first parameter is the socket, the second parameter is the IP address as a string.
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#### Returns
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`nil`
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#### Example
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```lua
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sk = net.createConnection(net.TCP, 0)
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sk:dns("www.nodemcu.com", function(conn, ip) print(ip) end)
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sk = nil
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```
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#### See also
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[`net.createServer()`](#netcreateserver)
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## net.socket:on()
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Register callback functions for specific events.
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#### Syntax
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`on(event, function())`
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#### Parameters
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- `event` string, which can be "connection", "reconnection", "disconnection", "receive" or "sent"
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- `function(net.socket[, string])` callback function. The first parameter is the socket. If event is "receive", the second parameter is the received data as string.
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#### Returns
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`nil`
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#### Example
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```lua
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sk = net.createConnection(net.TCP, 0)
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sk:on("receive", function(sck, c) print(c) end )
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sk:connect(80,"192.168.0.66")
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sk:on("connection", function(sck,c)
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-- Wait for connection before sending.
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sk:send("GET / HTTP/1.1\r\nHost: 192.168.0.66\r\nConnection: keep-alive\r\nAccept: */*\r\n\r\n")
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end)
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```
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#### See also
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[`net.createServer()`](#netcreateserver)
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## net.socket:send()
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Sends data to server.
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#### Syntax
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`send(string, function(sent))`
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#### Parameters
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- `string` data in string which will be sent to server
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- `function(sent)` callback function for sending string
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#### Returns
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`nil`
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#### Note
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Multiple consecutive `send()` calls aren't guaranteed to work (and often don't) as network requests are treated as separate tasks by the SDK. Instead, subscribe to the "sent" event on the socket and send additional data (or close) in that callback. See [#730](https://github.com/nodemcu/nodemcu-firmware/issues/730#issuecomment-154241161) for an example and explanation.
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#### See also
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[`net.socket:on()`](#netsocketon)
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# net.dns Module
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## net.dns.getdnsserver()
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Gets the IP address of the DNS server used to resolve hostnames.
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#### Syntax
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`net.dns.getdnsserver(dns_index)`
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#### Parameters
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dns_index which DNS server to get (range 0~1)
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#### Returns
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IP address (string) of DNS server
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#### Example
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```lua
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print(net.dns.getdnsserver(0)) -- 208.67.222.222
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print(net.dns.getdnsserver(1)) -- nil
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net.dns.setdnsserver("8.8.8.8", 0)
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net.dns.setdnsserver("192.168.1.252", 1)
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print(net.dns.getdnsserver(0)) -- 8.8.8.8
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print(net.dns.getdnsserver(1)) -- 192.168.1.252
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```
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#### See also
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[`net.dns:setdnsserver()`](#netdnssetdnsserver)
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## net.dns.resolve()
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Resolve a hostname to an IP address. Doesn't require a socket like [`net.socket.dns()`](#netsocketdns).
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#### Syntax
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`net.dns.resolve(host, function(ip))`
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#### Parameters
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- `host` hostname to resolve
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- `function(sk, ip)` callback called when the name was resolved. Don't use `sk`, it's a socket used internally to resolve the hostname.
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#### Returns
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`nil`
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#### Example
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```lua
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net.dns.resolve("www.google.com", function(sk, ip)
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if (ip == nil) then print("DNS fail!") else print(ip) end
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end)
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```
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#### See also
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[`net.socket:dns()`](#netsocketdns)
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## net.dns.setdnsserver()
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Sets the IP of the DNS server used to resolve hostnames. Default: resolver1.opendns.com (208.67.222.222). You can specify up to 2 DNS servers.
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#### Syntax
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`net.dns.setdnsserver(dns_ip_addr, dns_index)`
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#### Parameters
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- `dns_ip_addr` IP address of a DNS server
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- `dns_index` which DNS server to set (range 0~1). Hence, it supports max. 2 servers.
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#### Returns
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`nil`
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#### See also
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[`net.dns:getdnsserver()`](#netdnsgetdnsserver)
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# net.cert Module
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This controls certificate verification when SSL is in use.
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## net.cert.verify()
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Controls the vertificate verification process when the Nodemcu makes a secure connection.
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#### Syntax
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`net.cert.verify(enable)`
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`net.cert.verify(pemdata)`
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#### Parameters
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- `enable` A boolean which indicates whether verification should be enabled or not. The default at boot is `false`.
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- `pemdata` A string containing the CA certificate to use for verification.
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#### Returns
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`true` if it worked.
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Can throw a number of errors if invalid data is supplied.
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#### Example
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Make a secure https connection and verify that the certificate chain is valid.
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```
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net.cert.verify(true)
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http.get("https://example.com/info", nil, function (code, resp) print(code, resp) end)
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```
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Load a certificate into the flash chip and make a request. This is the [startssl](https://startssl.com) root certificate. They provide free
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certificates.
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```
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net.cert.verify([[
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-----BEGIN CERTIFICATE-----
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MIIHyTCCBbGgAwIBAgIBATANBgkqhkiG9w0BAQUFADB9MQswCQYDVQQGEwJJTDEW
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MBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0YWwg
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Q2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3RhcnRDb20gQ2VydGlmaWNh
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dGlvbiBBdXRob3JpdHkwHhcNMDYwOTE3MTk0NjM2WhcNMzYwOTE3MTk0NjM2WjB9
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MQswCQYDVQQGEwJJTDEWMBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMi
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U2VjdXJlIERpZ2l0YWwgQ2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3Rh
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cnRDb20gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwggIiMA0GCSqGSIb3DQEBAQUA
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A4ICDwAwggIKAoICAQDBiNsJvGxGfHiflXu1M5DycmLWwTYgIiRezul38kMKogZk
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pMyONvg45iPwbm2xPN1yo4UcodM9tDMr0y+v/uqwQVlntsQGfQqedIXWeUyAN3rf
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OQVSWff0G0ZDpNKFhdLDcfN1YjS6LIp/Ho/u7TTQEceWzVI9ujPW3U3eCztKS5/C
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Ji/6tRYccjV3yjxd5srhJosaNnZcAdt0FCX+7bWgiA/deMotHweXMAEtcnn6RtYT
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Kqi5pquDSR3l8u/d5AGOGAqPY1MWhWKpDhk6zLVmpsJrdAfkK+F2PrRt2PZE4XNi
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HzvEvqBTViVsUQn3qqvKv3b9bZvzndu/PWa8DFaqr5hIlTpL36dYUNk4dalb6kMM
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Av+Z6+hsTXBbKWWc3apdzK8BMewM69KN6Oqce+Zu9ydmDBpI125C4z/eIT574Q1w
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+2OqqGwaVLRcJXrJosmLFqa7LH4XXgVNWG4SHQHuEhANxjJ/GP/89PrNbpHoNkm+
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Gkhpi8KWTRoSsmkXwQqQ1vp5Iki/untp+HDH+no32NgN0nZPV/+Qt+OR0t3vwmC3
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Zzrd/qqc8NSLf3Iizsafl7b4r4qgEKjZ+xjGtrVcUjyJthkqcwEKDwOzEmDyei+B
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26Nu/yYwl/WL3YlXtq09s68rxbd2AvCl1iuahhQqcvbjM4xdCUsT37uMdBNSSwID
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AQABo4ICUjCCAk4wDAYDVR0TBAUwAwEB/zALBgNVHQ8EBAMCAa4wHQYDVR0OBBYE
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FE4L7xqkQFulF2mHMMo0aEPQQa7yMGQGA1UdHwRdMFswLKAqoCiGJmh0dHA6Ly9j
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ZXJ0LnN0YXJ0Y29tLm9yZy9zZnNjYS1jcmwuY3JsMCugKaAnhiVodHRwOi8vY3Js
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LnN0YXJ0Y29tLm9yZy9zZnNjYS1jcmwuY3JsMIIBXQYDVR0gBIIBVDCCAVAwggFM
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BgsrBgEEAYG1NwEBATCCATswLwYIKwYBBQUHAgEWI2h0dHA6Ly9jZXJ0LnN0YXJ0
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Y29tLm9yZy9wb2xpY3kucGRmMDUGCCsGAQUFBwIBFilodHRwOi8vY2VydC5zdGFy
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dGNvbS5vcmcvaW50ZXJtZWRpYXRlLnBkZjCB0AYIKwYBBQUHAgIwgcMwJxYgU3Rh
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cnQgQ29tbWVyY2lhbCAoU3RhcnRDb20pIEx0ZC4wAwIBARqBl0xpbWl0ZWQgTGlh
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YmlsaXR5LCByZWFkIHRoZSBzZWN0aW9uICpMZWdhbCBMaW1pdGF0aW9ucyogb2Yg
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dGhlIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5IFBvbGljeSBhdmFp
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bGFibGUgYXQgaHR0cDovL2NlcnQuc3RhcnRjb20ub3JnL3BvbGljeS5wZGYwEQYJ
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YIZIAYb4QgEBBAQDAgAHMDgGCWCGSAGG+EIBDQQrFilTdGFydENvbSBGcmVlIFNT
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TCBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTANBgkqhkiG9w0BAQUFAAOCAgEAFmyZ
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9GYMNPXQhV59CuzaEE44HF7fpiUFS5Eyweg78T3dRAlbB0mKKctmArexmvclmAk8
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jhvh3TaHK0u7aNM5Zj2gJsfyOZEdUauCe37Vzlrk4gNXcGmXCPleWKYK34wGmkUW
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FjgKXlf2Ysd6AgXmvB618p70qSmD+LIU424oh0TDkBreOKk8rENNZEXO3SipXPJz
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ewT4F+irsfMuXGRuczE6Eri8sxHkfY+BUZo7jYn0TZNmezwD7dOaHZrzZVD1oNB1
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ny+v8OqCQ5j4aZyJecRDjkZy42Q2Eq/3JR44iZB3fsNrarnDy0RLrHiQi+fHLB5L
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EUTINFInzQpdn4XBidUaePKVEFMy3YCEZnXZtWgo+2EuvoSoOMCZEoalHmdkrQYu
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L6lwhceWD3yJZfWOQ1QOq92lgDmUYMA0yZZwLKMS9R9Ie70cfmu3nZD0Ijuu+Pwq
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yvqCUqDvr0tVk+vBtfAii6w0TiYiBKGHLHVKt+V9E9e4DGTANtLJL4YSjCMJwRuC
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O3NJo2pXh5Tl1njFmUNj403gdy3hZZlyaQQaRwnmDwFWJPsfvw55qVguucQJAX6V
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um0ABj6y6koQOdjQK/W/7HW/lwLFCRsI3FU34oH7N4RDYiDK51ZLZer+bMEkkySh
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NOsF/5oirpt9P/FlUQqmMGqz9IgcgA38corog14=
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-----END CERTIFICATE-----
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]])
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http.get("https://pskreporter.info/gen404", nil, function (code, resp) print(code, resp) end)
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```
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#### Notes
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The certificate needed for verification is stored in the flash chip. The `net.cert.verify` call with `true`
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enables verification against the value stored in the flash.
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The certificate can be loaded into the flash chip in two ways -- one at firmware build time, and the other at initial boot
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of the firmware. In order to load the certificate at build time, just place a file containing the CA certificate (in PEM format)
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at `server-ca.crt` in the root of the nodemcu-firmware build tree. The build scripts will incorporate this into the resulting
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firmware image.
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The alternative approach is easier for development, and that is to supply the PEM data as a string value to `net.cert.verify`. This
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will store the certificate into the flash chip and turn on verification for that certificate. Subsequent boots of the nodemcu can then
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use `net.cert.verify(true)` and use the stored certificate.
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