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cmd/derper: improve logging on derp mesh connect

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Include the mesh log prefix in all mesh connection setup.

Updates tailscale/corp#25653

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker 2025-01-06 15:39:41 -08:00 committed by James Tucker
parent cc4aa435ef
commit 6e45a8304e
1 changed files with 7 additions and 3 deletions
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10
cmd/derper/mesh.go
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@ -47,6 +47,7 @@ func startMeshWithHost(s *derp.Server, host string) error {
c.SetURLDialer(func(ctx context.Context, network, addr string) (net.Conn, error) {
host, port, err := net.SplitHostPort(addr)
if err != nil {
logf("failed to split %q: %v", addr, err)
return nil, err
}
var d net.Dialer
@ -55,15 +56,18 @@ func startMeshWithHost(s *derp.Server, host string) error {
subCtx, cancel := context.WithTimeout(ctx, 2*time.Second)
defer cancel()
vpcHost := base + "-vpc.tailscale.com"
ips, _ := r.LookupIP(subCtx, "ip", vpcHost)
ips, err := r.LookupIP(subCtx, "ip", vpcHost)
if err != nil {
logf("failed to resolve %v: %v", vpcHost, err)
}
if len(ips) > 0 {
vpcAddr := net.JoinHostPort(ips[0].String(), port)
c, err := d.DialContext(subCtx, network, vpcAddr)
if err == nil {
log.Printf("connected to %v (%v) instead of %v", vpcHost, ips[0], base)
logf("connected to %v (%v) instead of %v", vpcHost, ips[0], base)
return c, nil
}
log.Printf("failed to connect to %v (%v): %v; trying non-VPC route", vpcHost, ips[0], err)
logf("failed to connect to %v (%v): %v; trying non-VPC route", vpcHost, ips[0], err)
}
}
return d.DialContext(ctx, network, addr)