Multiple revisions 374570,374581

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  r374570 | dlee | 2012-10-05 15:14:41 -0500 (Fri, 05 Oct 2012) | 22 lines
  
  Improve AMI long line error handling
  
  In AMI's parser, when it receives a long line (> 1024 characters), it discards
  that line, but continues to process the message normally.
  
  Typically, this is not a problem because a) who has lines that long and b)
  usually a discarded line results in an invalid message. But if that line is
  specifying an optional field, then the message will be processed, you get a
  'Response: Success', but things don't work the way you expected them to.
  
  This patch changes the behavior when a line-too-long parse error occurs.
  
  * Changes the log message to avoid way-too-long (and truncated anyways) log
    messages
  * Adds a 'parsing' status flag to Response: Success
  * Sets parsing = MESSAGE_LINE_TOO_LONG if, well, a line is too long
  * Responds with an appropriate error if parsing != MESSAGE_OKAY
  
  (closes issue AST-961)
  Reported by: John Bigelow
  Review: https://reviewboard.asterisk.org/r/2142/
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  r374581 | dlee | 2012-10-05 15:20:28 -0500 (Fri, 05 Oct 2012) | 1 line
  
  I've committed too much. Reverting part of r374570.
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Merged revisions 374570,374581 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 374586 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 374587 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@374588 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 34 insertions, 2 deletions

diff --git a/main/manager.c b/main/manager.c
index 1f25f379d..0a6d9620e 100644
--- a/main/manager.c
+++ b/main/manager.c
@@ -1129,6 +1129,11 @@ struct mansession_session {
 	AST_LIST_ENTRY(mansession_session) list;
 };
 
+enum mansession_message_parsing {
+	MESSAGE_OKAY,
+	MESSAGE_LINE_TOO_LONG
+};
+
 /*! \brief In case you didn't read that giant block of text above the mansession_session struct, the
  * \ref struct mansession is named this solely to keep the API the same in Asterisk. This structure really
  * represents data that is different from Manager action to Manager action. The mansession_session pointer
@@ -1139,6 +1144,7 @@ struct mansession {
 	struct ast_tcptls_session_instance *tcptls_session;
 	FILE *f;
 	int fd;
+	enum mansession_message_parsing parsing;
 	int write_error:1;
 	struct manager_custom_hook *hook;
 	ast_mutex_t lock;
@@ -5196,8 +5202,9 @@ static int get_input(struct mansession *s, char *output)
 	}
 	if (s->session->inlen >= maxlen) {
 		/* no crlf found, and buffer full - sorry, too long for us */
-		ast_log(LOG_WARNING, "Dumping long line with no return from %s: %s\n", ast_sockaddr_stringify_addr(&s->session->addr), src);
+		ast_log(LOG_WARNING, "Discarding message from %s. Line too long: %.25s...\n", ast_sockaddr_stringify_addr(&s->session->addr), src);
 		s->session->inlen = 0;
+		s->parsing = MESSAGE_LINE_TOO_LONG;
 	}
 	res = 0;
 	while (res == 0) {
@@ -5256,6 +5263,23 @@ static int get_input(struct mansession *s, char *output)
 
 /*!
  * \internal
+ * \brief Error handling for sending parse errors. This function handles locking, and clearing the
+ * parse error flag.
+ *
+ * \param s AMI session to process action request.
+ * \param m Message that's in error.
+ * \param error Error message to send.
+ */
+static void handle_parse_error(struct mansession *s, struct message *m, char *error)
+{
+	mansession_lock(s);
+	astman_send_error(s, m, error);
+	s->parsing = MESSAGE_OKAY;
+	mansession_unlock(s);
+}
+
+/*!
+ * \internal
  * \brief Read and process an AMI action request.
  *
  * \param s AMI session to process action request.
@@ -5307,7 +5331,15 @@ static int do_message(struct mansession *s)
 					mansession_unlock(s);
 					res = 0;
 				} else {
-					res = process_message(s, &m) ? -1 : 0;
+					switch (s->parsing) {
+					case MESSAGE_OKAY:
+						res = process_message(s, &m) ? -1 : 0;
+						break;
+					case MESSAGE_LINE_TOO_LONG:
+						handle_parse_error(s, &m, "Failed to parse message: line too long");
+						res = 0;
+						break;
+					}
 				}
 				break;
 			} else if (m.hdrcount < ARRAY_LEN(m.headers)) {