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TUN-8861: Add session limiter to TCP session manager

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## Summary
In order to make cloudflared behavior more predictable and
prevent an exhaustion of resources, we have decided to add
session limits that can be configured by the user. This commit
adds the session limiter to the HTTP/TCP handling path.
For now the limiter is set to run only in unlimited mode.
This commit is contained in:
João "Pisco" Fernandes
2025-01-14 14:05:18 +00:00
parent bf4954e96a
commit 8bfe111cab
12 changed files with 275 additions and 102 deletions
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14
connection/header.go
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@@ -22,8 +22,9 @@ var (
var (
// pre-generate possible values for res
responseMetaHeaderCfd = mustInitRespMetaHeader("cloudflared")
responseMetaHeaderOrigin = mustInitRespMetaHeader("origin")
responseMetaHeaderCfd = mustInitRespMetaHeader("cloudflared", false)
responseMetaHeaderCfdFlowRateLimited = mustInitRespMetaHeader("cloudflared", true)
responseMetaHeaderOrigin = mustInitRespMetaHeader("origin", false)
)
// HTTPHeader is a custom header struct that expects only ever one value for the header.
@@ -34,11 +35,12 @@ type HTTPHeader struct {
}
type responseMetaHeader struct {
Source string `json:"src"`
Source string `json:"src"`
FlowRateLimited bool `json:"flow_rate_limited,omitempty"`
}
func mustInitRespMetaHeader(src string) string {
header, err := json.Marshal(responseMetaHeader{Source: src})
func mustInitRespMetaHeader(src string, flowRateLimited bool) string {
header, err := json.Marshal(responseMetaHeader{Source: src, FlowRateLimited: flowRateLimited})
if err != nil {
panic(fmt.Sprintf("Failed to serialize response meta header = %s, err: %v", src, err))
}
@@ -112,7 +114,7 @@ func SerializeHeaders(h1Headers http.Header) string {
func DeserializeHeaders(serializedHeaders string) ([]HTTPHeader, error) {
const unableToDeserializeErr = "Unable to deserialize headers"
var deserialized []HTTPHeader
deserialized := make([]HTTPHeader, 0)
for _, serializedPair := range strings.Split(serializedHeaders, ";") {
if len(serializedPair) == 0 {
continue