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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package httpcaddyfile
import (
"encoding/json"
"fmt"
"slices"
"github.com/dustin/go-humanize"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
// serverOptions collects server config overrides parsed from Caddyfile global options
type serverOptions struct {
// If set, will only apply these options to servers that contain a
// listener address that matches exactly. If empty, will apply to all
// servers that were not already matched by another serverOptions.
ListenerAddress string
// These will all map 1:1 to the caddyhttp.Server struct
Name string
ListenerWrappersRaw []json.RawMessage
ReadTimeout caddy.Duration
ReadHeaderTimeout caddy.Duration
WriteTimeout caddy.Duration
IdleTimeout caddy.Duration
KeepAliveInterval caddy.Duration
MaxHeaderBytes int
EnableFullDuplex bool
Protocols []string
StrictSNIHost *bool
TrustedProxiesRaw json.RawMessage
TrustedProxiesStrict int
ClientIPHeaders []string
ShouldLogCredentials bool
Metrics *caddyhttp.Metrics
Trace bool // TODO: EXPERIMENTAL
}
func unmarshalCaddyfileServerOptions(d *caddyfile.Dispenser) (any, error) {
d.Next() // consume option name
serverOpts := serverOptions{}
if d.NextArg() {
serverOpts.ListenerAddress = d.Val()
if d.NextArg() {
return nil, d.ArgErr()
}
}
for d.NextBlock(0) {
switch d.Val() {
case "name":
if serverOpts.ListenerAddress == "" {
return nil, d.Errf("cannot set a name for a server without a listener address")
}
if !d.NextArg() {
return nil, d.ArgErr()
}
serverOpts.Name = d.Val()
case "listener_wrappers":
for nesting := d.Nesting(); d.NextBlock(nesting); {
modID := "caddy.listeners." + d.Val()
unm, err := caddyfile.UnmarshalModule(d, modID)
if err != nil {
return nil, err
}
listenerWrapper, ok := unm.(caddy.ListenerWrapper)
if !ok {
return nil, fmt.Errorf("module %s (%T) is not a listener wrapper", modID, unm)
}
jsonListenerWrapper := caddyconfig.JSONModuleObject(
listenerWrapper,
"wrapper",
listenerWrapper.(caddy.Module).CaddyModule().ID.Name(),
nil,
)
serverOpts.ListenerWrappersRaw = append(serverOpts.ListenerWrappersRaw, jsonListenerWrapper)
}
case "timeouts":
for nesting := d.Nesting(); d.NextBlock(nesting); {
switch d.Val() {
case "read_body":
if !d.NextArg() {
return nil, d.ArgErr()
}
dur, err := caddy.ParseDuration(d.Val())
if err != nil {
return nil, d.Errf("parsing read_body timeout duration: %v", err)
}
serverOpts.ReadTimeout = caddy.Duration(dur)
case "read_header":
if !d.NextArg() {
return nil, d.ArgErr()
}
dur, err := caddy.ParseDuration(d.Val())
if err != nil {
return nil, d.Errf("parsing read_header timeout duration: %v", err)
}
serverOpts.ReadHeaderTimeout = caddy.Duration(dur)
case "write":
if !d.NextArg() {
return nil, d.ArgErr()
}
dur, err := caddy.ParseDuration(d.Val())
if err != nil {
return nil, d.Errf("parsing write timeout duration: %v", err)
}
serverOpts.WriteTimeout = caddy.Duration(dur)
case "idle":
if !d.NextArg() {
return nil, d.ArgErr()
}
dur, err := caddy.ParseDuration(d.Val())
if err != nil {
return nil, d.Errf("parsing idle timeout duration: %v", err)
}
serverOpts.IdleTimeout = caddy.Duration(dur)
default:
return nil, d.Errf("unrecognized timeouts option '%s'", d.Val())
}
}
case "keepalive_interval":
if !d.NextArg() {
return nil, d.ArgErr()
}
dur, err := caddy.ParseDuration(d.Val())
if err != nil {
return nil, d.Errf("parsing keepalive interval duration: %v", err)
}
serverOpts.KeepAliveInterval = caddy.Duration(dur)
case "max_header_size":
var sizeStr string
if !d.AllArgs(&sizeStr) {
return nil, d.ArgErr()
}
size, err := humanize.ParseBytes(sizeStr)
if err != nil {
return nil, d.Errf("parsing max_header_size: %v", err)
}
serverOpts.MaxHeaderBytes = int(size)
case "enable_full_duplex":
if d.NextArg() {
return nil, d.ArgErr()
}
serverOpts.EnableFullDuplex = true
case "log_credentials":
if d.NextArg() {
return nil, d.ArgErr()
}
serverOpts.ShouldLogCredentials = true
case "protocols":
protos := d.RemainingArgs()
for _, proto := range protos {
if proto != "h1" && proto != "h2" && proto != "h2c" && proto != "h3" {
return nil, d.Errf("unknown protocol '%s': expected h1, h2, h2c, or h3", proto)
}
if slices.Contains(serverOpts.Protocols, proto) {
return nil, d.Errf("protocol %s specified more than once", proto)
}
serverOpts.Protocols = append(serverOpts.Protocols, proto)
}
if nesting := d.Nesting(); d.NextBlock(nesting) {
return nil, d.ArgErr()
}
case "strict_sni_host":
if d.NextArg() && d.Val() != "insecure_off" && d.Val() != "on" {
return nil, d.Errf("strict_sni_host only supports 'on' or 'insecure_off', got '%s'", d.Val())
}
boolVal := true
if d.Val() == "insecure_off" {
boolVal = false
}
serverOpts.StrictSNIHost = &boolVal
case "trusted_proxies":
if !d.NextArg() {
return nil, d.Err("trusted_proxies expects an IP range source module name as its first argument")
}
modID := "http.ip_sources." + d.Val()
unm, err := caddyfile.UnmarshalModule(d, modID)
if err != nil {
return nil, err
}
source, ok := unm.(caddyhttp.IPRangeSource)
if !ok {
return nil, fmt.Errorf("module %s (%T) is not an IP range source", modID, unm)
}
jsonSource := caddyconfig.JSONModuleObject(
source,
"source",
source.(caddy.Module).CaddyModule().ID.Name(),
nil,
)
serverOpts.TrustedProxiesRaw = jsonSource
case "trusted_proxies_strict":
if d.NextArg() {
return nil, d.ArgErr()
}
serverOpts.TrustedProxiesStrict = 1
case "client_ip_headers":
headers := d.RemainingArgs()
for _, header := range headers {
if slices.Contains(serverOpts.ClientIPHeaders, header) {
return nil, d.Errf("client IP header %s specified more than once", header)
}
serverOpts.ClientIPHeaders = append(serverOpts.ClientIPHeaders, header)
}
if nesting := d.Nesting(); d.NextBlock(nesting) {
return nil, d.ArgErr()
}
case "metrics":
serverOpts.Metrics = new(caddyhttp.Metrics)
for nesting := d.Nesting(); d.NextBlock(nesting); {
switch d.Val() {
case "per_host":
serverOpts.Metrics.PerHost = true
}
}
case "trace":
if d.NextArg() {
return nil, d.ArgErr()
}
serverOpts.Trace = true
default:
return nil, d.Errf("unrecognized servers option '%s'", d.Val())
}
}
return serverOpts, nil
}
// applyServerOptions sets the server options on the appropriate servers
func applyServerOptions(
servers map[string]*caddyhttp.Server,
options map[string]any,
_ *[]caddyconfig.Warning,
) error {
serverOpts, ok := options["servers"].([]serverOptions)
if !ok {
return nil
}
// check for duplicate names, which would clobber the config
existingNames := map[string]bool{}
for _, opts := range serverOpts {
if opts.Name == "" {
continue
}
if existingNames[opts.Name] {
return fmt.Errorf("cannot use duplicate server name '%s'", opts.Name)
}
existingNames[opts.Name] = true
}
// collect the server name overrides
nameReplacements := map[string]string{}
for key, server := range servers {
// find the options that apply to this server
optsIndex := slices.IndexFunc(serverOpts, func(s serverOptions) bool {
return s.ListenerAddress == "" || slices.Contains(server.Listen, s.ListenerAddress)
})
// if none apply, then move to the next server
if optsIndex == -1 {
continue
}
opts := serverOpts[optsIndex]
// set all the options
server.ListenerWrappersRaw = opts.ListenerWrappersRaw
server.ReadTimeout = opts.ReadTimeout
server.ReadHeaderTimeout = opts.ReadHeaderTimeout
server.WriteTimeout = opts.WriteTimeout
server.IdleTimeout = opts.IdleTimeout
server.KeepAliveInterval = opts.KeepAliveInterval
server.MaxHeaderBytes = opts.MaxHeaderBytes
server.EnableFullDuplex = opts.EnableFullDuplex
server.Protocols = opts.Protocols
server.StrictSNIHost = opts.StrictSNIHost
server.TrustedProxiesRaw = opts.TrustedProxiesRaw
server.ClientIPHeaders = opts.ClientIPHeaders
server.TrustedProxiesStrict = opts.TrustedProxiesStrict
server.Metrics = opts.Metrics
if opts.ShouldLogCredentials {
if server.Logs == nil {
server.Logs = new(caddyhttp.ServerLogConfig)
}
server.Logs.ShouldLogCredentials = opts.ShouldLogCredentials
}
if opts.Trace {
// TODO: THIS IS EXPERIMENTAL (MAY 2024)
if server.Logs == nil {
server.Logs = new(caddyhttp.ServerLogConfig)
}
server.Logs.Trace = opts.Trace
}
if opts.Name != "" {
nameReplacements[key] = opts.Name
}
}
// rename the servers if marked to do so
for old, new := range nameReplacements {
servers[new] = servers[old]
delete(servers, old)
}
return nil
}
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