Prevent double closing of FDs by EIVR

This caused a problem when asterisk was under heavy load and running both AGI and EIVR applications.
EIVR would close an FD at which point it would be considered freed and be used by a new AGI instance
the second close would then close the FD now in use by AGI.

(closes issue #16305)
Reported by: diLLec
Tested by: thedavidfactor, diLLec

Review: https://reviewboard.asterisk.org/r/436/


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@232587 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 35 insertions, 37 deletions

diff --git a/apps/app_externalivr.c b/apps/app_externalivr.c
index 39088c576..ba9c211fb 100644
--- a/apps/app_externalivr.c
+++ b/apps/app_externalivr.c
@@ -144,7 +144,7 @@ struct gen_state {
 };
 
 static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u, 
-	int eivr_events_fd, int eivr_commands_fd, int eivr_errors_fd, 
+	int *eivr_events_fd, int *eivr_commands_fd, int *eivr_errors_fd, 
 	const struct ast_str *args, const struct ast_flags flags);
 
 int eivr_connect_socket(struct ast_channel *chan, const char *host, int port);
@@ -353,9 +353,9 @@ static int app_exec(struct ast_channel *chan, const char *data)
 	struct ast_flags flags = { 0, };
 	char *opts[0];
 	struct playlist_entry *entry;
-	int child_stdin[2] = { 0, 0 };
-	int child_stdout[2] = { 0, 0 };
-	int child_stderr[2] = { 0, 0 };
+	int child_stdin[2] = { -1, -1 };
+	int child_stdout[2] = { -1, -1 };
+	int child_stderr[2] = { -1, -1 };
 	int res = -1;
 	int pid;
 
@@ -479,10 +479,9 @@ static int app_exec(struct ast_channel *chan, const char *data)
 		if (!(ser = ast_tcptls_client_create(&ivr_desc)) || !(ser = ast_tcptls_client_start(ser))) {
 			goto exit;
 		}
-		res = eivr_comm(chan, u, ser->fd, ser->fd, -1, comma_delim_args, flags);
+		res = eivr_comm(chan, u, &ser->fd, &ser->fd, NULL, comma_delim_args, flags);
 
 	} else {
-	
 		if (pipe(child_stdin)) {
 			ast_chan_log(LOG_ERROR, chan, "Could not create pipe for child input: %s\n", strerror(errno));
 			goto exit;
@@ -517,12 +516,12 @@ static int app_exec(struct ast_channel *chan, const char *data)
 		} else {
 			/* parent process */
 			close(child_stdin[0]);
-			child_stdin[0] = 0;
+			child_stdin[0] = -1;
 			close(child_stdout[1]);
-			child_stdout[1] = 0;
+			child_stdout[1] = -1;
 			close(child_stderr[1]);
-			child_stderr[1] = 0;
-			res = eivr_comm(chan, u, child_stdin[1], child_stdout[0], child_stderr[0], comma_delim_args, flags);
+			child_stderr[1] = -1;
+			res = eivr_comm(chan, u, &child_stdin[1], &child_stdout[0], &child_stderr[0], comma_delim_args, flags);
 		}
 	}
 
@@ -530,22 +529,22 @@ static int app_exec(struct ast_channel *chan, const char *data)
 	if (u->gen_active) {
 		ast_deactivate_generator(chan);
 	}
-	if (child_stdin[0]) {
+	if (child_stdin[0] > -1) {
 		close(child_stdin[0]);
 	}
-	if (child_stdin[1]) {
+	if (child_stdin[1] > -1) {
 		close(child_stdin[1]);
 	}
-	if (child_stdout[0]) {
+	if (child_stdout[0] > -1) {
 		close(child_stdout[0]);
 	}
-	if (child_stdout[1]) {
+	if (child_stdout[1] > -1) {
 		close(child_stdout[1]);
 	}
-	if (child_stderr[0]) {
+	if (child_stderr[0] > -1) {
 		close(child_stderr[0]);
 	}
-	if (child_stderr[1]) {
+	if (child_stderr[1] > -1) {
 		close(child_stderr[1]);
 	}
 	if (ser) {
@@ -558,7 +557,7 @@ static int app_exec(struct ast_channel *chan, const char *data)
 }
 
 static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u, 
- 				int eivr_events_fd, int eivr_commands_fd, int eivr_errors_fd, 
+ 				int *eivr_events_fd, int *eivr_commands_fd, int *eivr_errors_fd, 
  				const struct ast_str *args, const struct ast_flags flags)
 {
 	struct playlist_entry *entry;
@@ -566,7 +565,7 @@ static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u,
 	int ms;
  	int exception;
  	int ready_fd;
- 	int waitfds[2] = { eivr_commands_fd, eivr_errors_fd };
+	int waitfds[2] = { *eivr_commands_fd, (eivr_errors_fd) ? *eivr_errors_fd : -1 };
  	struct ast_channel *rchan;
  	int res = -1;
 	int test_available_fd = -1;
@@ -576,16 +575,16 @@ static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u,
  	FILE *eivr_errors = NULL;
  	FILE *eivr_events = NULL;
 
-	if (!(eivr_events = fdopen(eivr_events_fd, "w"))) {
+	if (!(eivr_events = fdopen(*eivr_events_fd, "w"))) {
 		ast_chan_log(LOG_ERROR, chan, "Could not open stream to send events\n");
 		goto exit;
 	}
-	if (!(eivr_commands = fdopen(eivr_commands_fd, "r"))) {
+	if (!(eivr_commands = fdopen(*eivr_commands_fd, "r"))) {
 		ast_chan_log(LOG_ERROR, chan, "Could not open stream to receive commands\n");
 		goto exit;
 	}
-	if (eivr_errors_fd > -1) {  /* if opening a socket connection, error stream will not be used */
- 		if (!(eivr_errors = fdopen(eivr_errors_fd, "r"))) {
+	if (eivr_errors_fd) {  /* if opening a socket connection, error stream will not be used */
+ 		if (!(eivr_errors = fdopen(*eivr_errors_fd, "r"))) {
  			ast_chan_log(LOG_ERROR, chan, "Could not open stream to receive errors\n");
  			goto exit;
  		}
@@ -621,7 +620,7 @@ static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u,
  		errno = 0;
  		exception = 0;
  
- 		rchan = ast_waitfor_nandfds(&chan, 1, waitfds, (eivr_errors_fd < 0) ? 1 : 2, &exception, &ready_fd, &ms);
+ 		rchan = ast_waitfor_nandfds(&chan, 1, waitfds, (eivr_errors_fd) ? 2 : 1, &exception, &ready_fd, &ms);
  
  		if (chan->_state == AST_STATE_UP && !AST_LIST_EMPTY(&u->finishlist)) {
  			AST_LIST_LOCK(&u->finishlist);
@@ -664,10 +663,10 @@ static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u,
  				break;
  			}
  			ast_frfree(f);
- 		} else if (ready_fd == eivr_commands_fd) {
+ 		} else if (ready_fd == *eivr_commands_fd) {
  			char input[1024];
  
- 			if (exception || (dup2(eivr_commands_fd, test_available_fd) == -1) || feof(eivr_commands)) {
+ 			if (exception || (dup2(*eivr_commands_fd, test_available_fd) == -1) || feof(eivr_commands)) {
  				ast_chan_log(LOG_ERROR, chan, "Child process went away\n");
   				break;
   			}
@@ -784,7 +783,7 @@ static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u,
  				else
  					ast_chan_log(LOG_WARNING, chan, "Unknown option requested: %s\n", &input[2]);
  			}
- 		} else if (eivr_errors_fd && ready_fd == eivr_errors_fd) {
+ 		} else if (eivr_errors_fd && (ready_fd == *eivr_errors_fd)) {
  			char input[1024];
   
  			if (exception || feof(eivr_errors)) {
@@ -802,25 +801,24 @@ static int eivr_comm(struct ast_channel *chan, struct ivr_localuser *u,
  			break;
  		}
  	}
-  
- 
-exit:
  
+	exit:
 	if (test_available_fd > -1) {
 		close(test_available_fd);
 	}
-
-	if (eivr_events)
+	if (eivr_events) {
  		fclose(eivr_events);
- 
-	if (eivr_commands)
+		*eivr_events_fd = -1;
+	}
+	if (eivr_commands) {
 		fclose(eivr_commands);
-
-	if (eivr_errors)
+		*eivr_commands_fd = -1;
+	}
+	if (eivr_errors) {
 		fclose(eivr_errors);
-  
+		*eivr_errors_fd = -1;
+	}
   	return res;
- 
 }
 
 static int unload_module(void)