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reverseproxy: allow no port for SRV; fix regression in d55d50b (#3756)

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* reverseproxy: fix breakage in handling SRV lookup introduced by 3695

* reverseproxy: validate against incompatible config options with lookup_srv

* reverseproxy: add integration test cases for validations involving lookup_srv

* reverseproxy: clarify the reason for skipping an iteration

* grammar.. Oxford comma

Co-authored-by: Francis Lavoie <lavofr@gmail.com>

Co-authored-by: Francis Lavoie <lavofr@gmail.com>

Fixes #3753
This commit is contained in:
Mohammed Al Sahaf
2020-10-01 23:05:39 +03:00
committed by GitHub
parent 3b9eae70c9
commit 6722426f1a
2 changed files with 129 additions and 10 deletions
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modules/caddyhttp/reverseproxy/reverseproxy.go
+26 -10
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@@ -129,6 +129,21 @@ func (h *Handler) Provision(ctx caddy.Context) error {
h.ctx = ctx
h.logger = ctx.Logger(h)
// get validation out of the way
for i, v := range h.Upstreams {
// Having LookupSRV non-empty conflicts with 2 other config parameters: active health checks, and upstream dial address.
// Therefore if LookupSRV is empty, then there are no immediately apparent config conflicts, and the iteration can be skipped.
if v.LookupSRV == "" {
continue
}
if h.HealthChecks != nil && h.HealthChecks.Active != nil {
return fmt.Errorf(`upstream: lookup_srv is incompatible with active health checks: %d: {"dial": %q, "lookup_srv": %q}`, i, v.Dial, v.LookupSRV)
}
if v.Dial != "" {
return fmt.Errorf(`upstream: specifying dial address is incompatible with lookup_srv: %d: {"dial": %q, "lookup_srv": %q}`, i, v.Dial, v.LookupSRV)
}
}
// start by loading modules
if h.TransportRaw != nil {
mod, err := ctx.LoadModule(h, "TransportRaw")
@@ -204,17 +219,18 @@ func (h *Handler) Provision(ctx caddy.Context) error {
// set up upstreams
for _, upstream := range h.Upstreams {
addr, err := caddy.ParseNetworkAddress(upstream.Dial)
if err != nil {
return err
if upstream.LookupSRV == "" {
addr, err := caddy.ParseNetworkAddress(upstream.Dial)
if err != nil {
return err
}
if addr.PortRangeSize() != 1 {
return fmt.Errorf("multiple addresses (upstream must map to only one address): %v", addr)
}
upstream.networkAddress = addr
}
if addr.PortRangeSize() != 1 {
return fmt.Errorf("multiple addresses (upstream must map to only one address): %v", addr)
}
upstream.networkAddress = addr
// create or get the host representation for this upstream
var host Host = new(upstreamHost)
existingHost, loaded := hosts.LoadOrStore(upstream.String(), host)