Github user bgaff commented on a diff in the pull request:
https://github.com/apache/trafficserver/pull/624#discussion_r62779359
--- Diff: lib/atscppapi/examples/websocket/WebSocket.cc ---
@@ -0,0 +1,311 @@
+#include "WebSocket.hh"
+
+#include <iostream>
+#include "ts/ink_base64.h"
+#include "openssl/evp.h"
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+// DISCLAIMER: this is intended for demonstration purposes only and
+// does not pretend to implement a complete (or useful) server.
+
+using namespace atscppapi;
+
+#define SAY(a) std::cout << a << std::endl;
+#define SHOW(a) std::cout << #a << " = " << a << std::endl
+
+enum ws_frametypes {
+ WS_FRAME_CONTINUATION = 0x0,
+ WS_FRAME_TEXT = 0x1,
+ WS_FRAME_BINARY = 0x2,
+ WS_FRAME_CLOSE = 0x8,
+ WS_FRAME_PING = 0x9,
+ WS_FRAME_PONG = 0xA
+};
+typedef enum ws_frametypes WS_FRAMETYPES;
+
+#define WS_RSV1 0x40
+#define WS_RSV2 0x20
+#define WS_RSV3 0x10
+#define WS_MASKED 0x80
+#define WS_OPCODE 0x0F
+#define WS_FIN 0x80
+#define WS_LENGTH 0x7F
+#define WS_16BIT_LEN 126
+#define WS_64BIT_LEN 127
+
+void TSPluginInit(int argc, const char* argv[])
+{
+ RegisterGlobalPlugin("WebSocket", "Apache", "supp...@example.com");
+ new WebSocketInstaller();
+}
+
+// WebSocketInstaller
+
+WebSocketInstaller::WebSocketInstaller()
+ : GlobalPlugin(true /* ignore internal transactions */)
+{
+
GlobalPlugin::registerHook(Plugin::HOOK_READ_REQUEST_HEADERS_PRE_REMAP);
+}
+
+#define WS_DIGEST_MAX ATS_BASE64_ENCODE_DSTLEN(20)
+static const std::string magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+
+static std::string ws_digest(std::string const& key) {
+ EVP_MD_CTX digest;
+ EVP_MD_CTX_init(&digest);
+
+ if (!EVP_DigestInit_ex(&digest, EVP_sha1(), NULL)) {
+ EVP_MD_CTX_cleanup(&digest);
+ return "init-failed";
+ }
+ if (!EVP_DigestUpdate(&digest, key.data(), key.length())) {
+ EVP_MD_CTX_cleanup(&digest);
+ return "update1-failed";
+ }
+ if (!EVP_DigestUpdate(&digest, magic.data(), magic.length())) {
+ EVP_MD_CTX_cleanup(&digest);
+ return "update2-failed";
+ }
+
+ unsigned char hash_buf[EVP_MAX_MD_SIZE];
+ unsigned int hash_len = 0;
+ if (!EVP_DigestFinal_ex(&digest, hash_buf, &hash_len)) {
+ EVP_MD_CTX_cleanup(&digest);
+ return "final-failed";
+ }
+ EVP_MD_CTX_cleanup(&digest);
+ if (hash_len != 20) {
+ return "bad-hash-length";
+ }
+
+ char digest_buf[WS_DIGEST_MAX];
+ size_t digest_len = 0;
+
+ ats_base64_encode(hash_buf, hash_len, digest_buf, WS_DIGEST_MAX,
&digest_len);
+
+ return std::string((char*)digest_buf, digest_len);
+}
+
+void WebSocketInstaller::handleReadRequestHeadersPreRemap(Transaction
&transaction)
+{
+ SAY("Incoming request.");
+ transaction.addPlugin(new WebSocket(transaction));
+ transaction.resume();
+}
+
+// WebSocket implementation.
+
+WebSocket::WebSocket(Transaction& transaction)
+ : InterceptPlugin(transaction, InterceptPlugin::SERVER_INTERCEPT)
+ , pos_(0)
+ , ctrl_(0)
+ , mask_len_(0)
+ , msg_len_(0)
+ , ws_handshake_done_(false)
+{
+ if (isWebsocket()) {
+ ws_key_ =
transaction.getClientRequest().getHeaders().values("sec-websocket-key");
+ }
+}
+
+WebSocket::~WebSocket()
+{
+ SAY("WebSocket finished.");
+}
+
+void WebSocket::ws_send(std::string const& data, int code)
+{
+ size_t len = data.length();
+
+ std::string frame;
+ frame.reserve(len + 10);
+ frame += char(code);
+
+ int len_len;
+ if (len <= 125) {
+ frame += char(len);
+ len_len = 0;
+ } else if (len <= UINT16_MAX) {
+ frame += char(WS_16BIT_LEN);
+ len_len = 2;
+ } else {
+ frame += char(WS_64BIT_LEN);
+ len_len = 8;
+ }
+ // Convert length to big-endian bytes.
+ while (--len_len >= 0) {
+ frame += char((len >> (8*len_len)) & 0xFF);
--- End diff --
To convert the length to big endian just use:
htons() or htobe64(), same idea as below.
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