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Detect local "primary" IP address

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This commit is contained in:
Federico Ceratto 2019-03-16 18:51:26 +00:00
commit 5825dcb0b5
3 changed files with 44 additions and 0 deletions
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20
lib/pure/net.nim
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@ -1662,3 +1662,23 @@ proc connect*(socket: Socket, address: string, port = Port(0),
socket.fd.setBlocking(true)
doAssert socket.gotHandshake()
socket.fd.setBlocking(true)
proc getPrimaryIPAddr*(dest = parseIpAddress("8.8.8.8")): IpAddress =
## Finds the local IP address, usually assigned to eth0 on LAN or wlan0 on WiFi,
## used to reach an external address. Useful to run local services.
##
## No traffic is sent.
##
## Supports IPv4 and v6.
## Raises OSError if external networking is not set up.
##
## .. code-block:: Nim
## echo $getPrimaryIPAddr() # "192.168.1.2"
let socket =
if dest.family == IpAddressFamily.IPv4:
newSocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
else:
newSocket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)
socket.connect($dest, 80.Port)
socket.getLocalAddr()[0].parseIpAddress()