parser: returning 2 from on_headers_complete

Returning `2` from on_headers_complete will tell parser that it
should not expect neither a body nor any futher responses on
this connection. This is useful for handling responses to a
CONNECT request which may not contain `Upgrade` or
`Connection: upgrade` headers.

See: https://github.com/nodejs/node/pull/6198
PR-URL: https://github.com/nodejs/http-parser/pull/299
Reviewed-By: Brian White <mscdex@mscdex.net>

http_parser.c

@@ -1812,6 +1812,9 @@ reexecute:
             case 0:
               break;
 
+            case 2:
+              parser->upgrade = 1;
+
             case 1:
               parser->flags |= F_SKIPBODY;
               break;

http_parser.h

@@ -77,6 +77,11 @@ typedef struct http_parser_settings http_parser_settings;
  * HEAD request which may contain 'Content-Length' or 'Transfer-Encoding:
  * chunked' headers that indicate the presence of a body.
  *
+ * Returning `2` from on_headers_complete will tell parser that it should not
+ * expect neither a body nor any futher responses on this connection. This is
+ * useful for handling responses to a CONNECT request which may not contain
+ * `Upgrade` or `Connection: upgrade` headers.
+ *
  * http_data_cb does not return data chunks. It will be called arbitrarily
  * many times for each string. E.G. you might get 10 callbacks for "on_url"
  * each providing just a few characters more data.

test.c

@@ -2173,6 +2173,20 @@ pause_chunk_complete_cb (http_parser *p)
   return chunk_complete_cb(p);
 }
 
+int
+connect_headers_complete_cb (http_parser *p)
+{
+  headers_complete_cb(p);
+  return 1;
+}
+
+int
+connect_message_complete_cb (http_parser *p)
+{
+  messages[num_messages].should_keep_alive = http_should_keep_alive(parser);
+  return message_complete_cb(p);
+}
+
 static http_parser_settings settings_pause =
   {.on_message_begin = pause_message_begin_cb
   ,.on_header_field = pause_header_field_cb
@@ -2212,6 +2226,19 @@ static http_parser_settings settings_count_body =
   ,.on_chunk_complete = chunk_complete_cb
   };
 
+static http_parser_settings settings_connect =
+  {.on_message_begin = message_begin_cb
+  ,.on_header_field = header_field_cb
+  ,.on_header_value = header_value_cb
+  ,.on_url = request_url_cb
+  ,.on_status = response_status_cb
+  ,.on_body = dontcall_body_cb
+  ,.on_headers_complete = connect_headers_complete_cb
+  ,.on_message_complete = connect_message_complete_cb
+  ,.on_chunk_header = chunk_header_cb
+  ,.on_chunk_complete = chunk_complete_cb
+  };
+
 static http_parser_settings settings_null =
   {.on_message_begin = 0
   ,.on_header_field = 0
@@ -2275,6 +2302,14 @@ size_t parse_pause (const char *buf, size_t len)
   return nparsed;
 }
 
+size_t parse_connect (const char *buf, size_t len)
+{
+  size_t nparsed;
+  currently_parsing_eof = (len == 0);
+  nparsed = http_parser_execute(parser, &settings_connect, buf, len);
+  return nparsed;
+}
+
 static inline int
 check_str_eq (const struct message *m,
               const char *prop,
@@ -2331,7 +2366,7 @@ do {                                                                 \
 } while(0)
 
 int
-message_eq (int index, const struct message *expected)
+message_eq (int index, int connect, const struct message *expected)
 {
   int i;
   struct message *m = &messages[index];
@@ -2346,8 +2381,10 @@ message_eq (int index, const struct message *expected)
     MESSAGE_CHECK_STR_EQ(expected, m, response_status);
   }
 
+  if (!connect) {
     MESSAGE_CHECK_NUM_EQ(expected, m, should_keep_alive);
     MESSAGE_CHECK_NUM_EQ(expected, m, message_complete_on_eof);
+  }
 
   assert(m->message_begin_cb_called);
   assert(m->headers_complete_cb_called);
@@ -2385,17 +2422,23 @@ message_eq (int index, const struct message *expected)
     MESSAGE_CHECK_NUM_EQ(expected, m, port);
   }
 
-  if (expected->body_size) {
+  if (connect) {
+    check_num_eq(m, "body_size", 0, m->body_size);
+  } else if (expected->body_size) {
     MESSAGE_CHECK_NUM_EQ(expected, m, body_size);
   } else {
     MESSAGE_CHECK_STR_EQ(expected, m, body);
   }
 
+  if (connect) {
+    check_num_eq(m, "num_chunks_complete", 0, m->num_chunks_complete);
+  } else {
     assert(m->num_chunks == m->num_chunks_complete);
     MESSAGE_CHECK_NUM_EQ(expected, m, num_chunks_complete);
     for (i = 0; i < m->num_chunks && i < MAX_CHUNKS; i++) {
       MESSAGE_CHECK_NUM_EQ(expected, m, chunk_lengths[i]);
     }
+  }
 
   MESSAGE_CHECK_NUM_EQ(expected, m, num_headers);
 
@@ -3201,7 +3244,7 @@ test_message (const struct message *message)
       abort();
     }
 
-    if(!message_eq(0, message)) abort();
+    if(!message_eq(0, 0, message)) abort();
 
     parser_free();
   }
@@ -3238,7 +3281,7 @@ test_message_count_body (const struct message *message)
     abort();
   }
 
-  if(!message_eq(0, message)) abort();
+  if(!message_eq(0, 0, message)) abort();
 
   parser_free();
 }
@@ -3589,9 +3632,9 @@ test:
     abort();
   }
 
-  if (!message_eq(0, r1)) abort();
-  if (message_count > 1 && !message_eq(1, r2)) abort();
-  if (message_count > 2 && !message_eq(2, r3)) abort();
+  if (!message_eq(0, 0, r1)) abort();
+  if (message_count > 1 && !message_eq(1, 0, r2)) abort();
+  if (message_count > 2 && !message_eq(2, 0, r3)) abort();
 
   parser_free();
 }
@@ -3687,17 +3730,17 @@ test:
           goto error;
         }
 
-        if (!message_eq(0, r1)) {
+        if (!message_eq(0, 0, r1)) {
           fprintf(stderr, "\n\nError matching messages[0] in test_scan.\n");
           goto error;
         }
 
-        if (message_count > 1 && !message_eq(1, r2)) {
+        if (message_count > 1 && !message_eq(1, 0, r2)) {
           fprintf(stderr, "\n\nError matching messages[1] in test_scan.\n");
           goto error;
         }
 
-        if (message_count > 2 && !message_eq(2, r3)) {
+        if (message_count > 2 && !message_eq(2, 0, r3)) {
           fprintf(stderr, "\n\nError matching messages[2] in test_scan.\n");
           goto error;
         }
@@ -3796,7 +3839,29 @@ test:
     abort();
   }
 
-  if(!message_eq(0, msg)) abort();
+  if(!message_eq(0, 0, msg)) abort();
+
+  parser_free();
+}
+
+/* Verify that body and next message won't be parsed in responses to CONNECT */
+void
+test_message_connect (const struct message *msg)
+{
+  char *buf = (char*) msg->raw;
+  size_t buflen = strlen(msg->raw);
+  size_t nread;
+
+  parser_init(msg->type);
+
+  nread = parse_connect(buf, buflen);
+
+  if (num_messages != 1) {
+    printf("\n*** num_messages != 1 after testing '%s' ***\n\n", msg->name);
+    abort();
+  }
+
+  if(!message_eq(0, 1, msg)) abort();
 
   parser_free();
 }
@@ -3867,6 +3932,10 @@ main (void)
     test_message_pause(&responses[i]);
   }
 
+  for (i = 0; i < response_count; i++) {
+    test_message_connect(&responses[i]);
+  }
+
   for (i = 0; i < response_count; i++) {
     if (!responses[i].should_keep_alive) continue;
     for (j = 0; j < response_count; j++) {