net: Change how we detect OCSP vs CRL requests from NSS.

(Addresses wtc's comments in http://codereview.chromium.org/2834030/show)

http://codereview.chromium.org/2827042/show

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@51537 0039d316-1c4b-4281-b951-d872f2087c98

net/ocsp/nss_ocsp.cc

@@ -599,7 +599,11 @@ SECStatus OCSPTrySendAndReceive(SEC_HTTP_REQUEST_SESSION request,
                                 const char** http_response_headers,
                                 const char** http_response_data,
                                 PRUint32* http_response_data_len) {
-  base::Time start_time, end_time;
+  if (http_response_data_len) {
+    // We must always set an output value, even on failure.  The output value 0
+    // means the failure was unrelated to the acceptable response data length.
+    *http_response_data_len = 0;
+  }
 
   LOG(INFO) << "OCSP try send and receive";
   DCHECK(!MessageLoop::current());
@@ -612,24 +616,62 @@ SECStatus OCSPTrySendAndReceive(SEC_HTTP_REQUEST_SESSION request,
     // We support blocking mode only, so this function shouldn't be called
     // again when req has stareted or finished.
     NOTREACHED();
-    goto failed;
+    PORT_SetError(SEC_ERROR_BAD_HTTP_RESPONSE);  // Simple approximation.
+    return SECFailure;
   }
 
-  start_time = base::Time::Now();
+  const base::Time start_time = base::Time::Now();
   req->Start();
-  if (!req->Wait())
-    goto failed;
-  end_time = base::Time::Now();
-
-  if (req->http_request_method() == "POST") {
-    UMA_HISTOGRAM_TIMES("Net.OCSPRequestTimeMs", end_time - start_time);
-  } else if (req->http_request_method() == "GET") {
-    UMA_HISTOGRAM_TIMES("Net.CRLRequestTimeMs", end_time - start_time);
+  if (!req->Wait() || req->http_response_code() == static_cast<PRUint16>(-1)) {
+    // If the response code is -1, the request failed and there is no response.
+    PORT_SetError(SEC_ERROR_BAD_HTTP_RESPONSE);  // Simple approximation.
+    return SECFailure;
+  }
+  const base::TimeDelta duration = base::Time::Now() - start_time;
+
+  // We want to know if this was:
+  //   1) An OCSP request
+  //   2) A CRL request
+  //   3) A request for a missing intermediate certificate
+  // There's no sure way to do this, so we use heuristics like MIME type and
+  // URL.
+  const char* mime_type = req->http_response_content_type().c_str();
+  bool is_ocsp_resp =
+      strcasecmp(mime_type, "application/ocsp-response") == 0;
+  bool is_crl_resp = strcasecmp(mime_type, "application/x-pkcs7-crl") == 0 ||
+                     strcasecmp(mime_type, "application/x-x509-crl") == 0 ||
+                     strcasecmp(mime_type, "application/pkix-crl") == 0;
+  bool is_crt_resp =
+      strcasecmp(mime_type, "application/x-x509-ca-cert") == 0 ||
+      strcasecmp(mime_type, "application/x-x509-server-cert") == 0 ||
+      strcasecmp(mime_type, "application/pkix-cert") == 0 ||
+      strcasecmp(mime_type, "application/pkcs7-mime") == 0;
+  bool known_resp_type = is_crt_resp || is_crt_resp || is_ocsp_resp;
+
+  bool crl_in_url, crt_in_url, ocsp_in_url, have_url_hint;
+  if (!known_resp_type) {
+    const char* path = req->url().path().c_str();
+    const char* host = req->url().host().c_str();
+    crl_in_url = strcasestr(path, ".crl") != NULL;
+    crt_in_url = strcasestr(path, ".crt") != NULL ||
+                 strcasestr(path, ".p7c") != NULL ||
+                 strcasestr(path, ".cer") != NULL;
+    ocsp_in_url = strcasestr(host, "ocsp") != NULL;
+    have_url_hint = crl_in_url || crt_in_url || ocsp_in_url;
+  }
+
+  if (is_ocsp_resp ||
+      (!known_resp_type && (ocsp_in_url ||
+                            (!have_url_hint &&
+                             req->http_request_method() == "POST")))) {
+    UMA_HISTOGRAM_TIMES("Net.OCSPRequestTimeMs", duration);
+  } else if (is_crl_resp || (!known_resp_type && crl_in_url)) {
+    UMA_HISTOGRAM_TIMES("Net.CRLRequestTimeMs", duration);
+  } else if (is_crt_resp || (!known_resp_type && crt_in_url)) {
+    UMA_HISTOGRAM_TIMES("Net.CRTRequestTimeMs", duration);
+  } else {
+    UMA_HISTOGRAM_TIMES("Net.UnknownTypeRequestTimeMs", duration);
   }
-
-  // If the response code is -1, the request failed and there is no response.
-  if (req->http_response_code() == static_cast<PRUint16>(-1))
-    goto failed;
 
   return OCSPSetResponse(
       req, http_response_code,
@@ -637,15 +679,6 @@ SECStatus OCSPTrySendAndReceive(SEC_HTTP_REQUEST_SESSION request,
       http_response_headers,
       http_response_data,
       http_response_data_len);
-
- failed:
-  if (http_response_data_len) {
-    // We must always set an output value, even on failure.  The output value 0
-    // means the failure was unrelated to the acceptable response data length.
-    *http_response_data_len = 0;
-  }
-  PORT_SetError(SEC_ERROR_BAD_HTTP_RESPONSE);  // Simple approximation.
-  return SECFailure;
 }
 
 SECStatus OCSPFree(SEC_HTTP_REQUEST_SESSION request) {