ping: use current sender address at each request

The sending IP address can change after the start of the program.
That's happening regularly with IPv6 SLAAC privacy extensions.

1 files changed, 2 insertions, 2 deletions

diff --git a/ping.nim b/ping.nim
index b09d5f1..dd41882 100644
--- a/ping.nim
+++ b/ping.nim
@@ -217,11 +217,11 @@ proc initPingMonitor*(target: IpAddress, ident: uint16): PingMonitor =
   PingMonitor(
     socket: newSocket(domain, SOCK_RAW, proto),
     target: target,
-    source: getPrimaryIPAddr(target),
     ident: ident,
   )
 
-func buildEchoRequest(mon: PingMonitor): ICMPPacket =
+proc buildEchoRequest(mon: PingMonitor): ICMPPacket =
+  mon.source = getPrimaryIPAddr(dest=mon.target)
   buildEchoRequest(mon.source, mon.target, mon.ident, mon.seqNum, mon.payload)
 
 proc sendEchoRequest(mon: PingMonitor, timeout: Duration) =