New AMI Command Output Format

This change modifies how the the output from a CLI command is sent
to a client over AMI.

Output from the CLI command is now sent as a series of zero-or-more
Output: headers.

Additionally, commands that fail to execute (eg: no such command,
invalid syntax etc.) now cause an Error response instead of Success.

If the command executed successfully, but the manager unable to
provide the output the reason will be included in the Message:
header. Otherwise it will contain 'Command output follows'.

Depends on a new version of starpy (> 1.0.2) that supports the new
output format.

See pull-request https://github.com/asterisk/starpy/pull/34

ASTERISK-24730

Change-Id: I6718d95490f0a6b3f171c1a5cdad9207f9a44888

1 files changed, 31 insertions, 25 deletions

diff --git a/main/manager.c b/main/manager.c
index f2a516f24..2ff9df930 100644
--- a/main/manager.c
+++ b/main/manager.c
@@ -4839,11 +4839,10 @@ static int check_blacklist(const char *cmd)
 static int action_command(struct mansession *s, const struct message *m)
 {
 	const char *cmd = astman_get_header(m, "Command");
-	const char *id = astman_get_header(m, "ActionID");
-	char *buf = NULL, *final_buf = NULL;
+	char *buf = NULL, *final_buf = NULL, *delim, *output;
 	char template[] = "/tmp/ast-ami-XXXXXX";	/* template for temporary file */
-	int fd;
-	off_t l;
+	int fd, ret;
+	off_t len;
 
 	if (ast_strlen_zero(cmd)) {
 		astman_send_error(s, m, "No command provided");
@@ -4856,52 +4855,59 @@ static int action_command(struct mansession *s, const struct message *m)
 	}
 
 	if ((fd = mkstemp(template)) < 0) {
-		ast_log(AST_LOG_WARNING, "Failed to create temporary file for command: %s\n", strerror(errno));
-		astman_send_error(s, m, "Command response construction error");
+		astman_send_error_va(s, m, "Failed to create temporary file: %s", strerror(errno));
 		return 0;
 	}
 
-	astman_append(s, "Response: Follows\r\nPrivilege: Command\r\n");
-	if (!ast_strlen_zero(id)) {
-		astman_append(s, "ActionID: %s\r\n", id);
-	}
-	/* FIXME: Wedge a ActionID response in here, waiting for later changes */
-	ast_cli_command(fd, cmd);	/* XXX need to change this to use a FILE * */
+	ret = ast_cli_command(fd, cmd);
+	astman_send_response_full(s, m, ret == RESULT_SUCCESS ? "Success" : "Error", MSG_MOREDATA, NULL);
+
 	/* Determine number of characters available */
-	if ((l = lseek(fd, 0, SEEK_END)) < 0) {
-		ast_log(LOG_WARNING, "Failed to determine number of characters for command: %s\n", strerror(errno));
+	if ((len = lseek(fd, 0, SEEK_END)) < 0) {
+		astman_append(s, "Message: Failed to determine number of characters: %s\r\n", strerror(errno));
 		goto action_command_cleanup;
 	}
 
 	/* This has a potential to overflow the stack.  Hence, use the heap. */
-	buf = ast_malloc(l + 1);
-	final_buf = ast_malloc(l + 1);
+	buf = ast_malloc(len + 1);
+	final_buf = ast_malloc(len + 1);
 
 	if (!buf || !final_buf) {
-		ast_log(LOG_WARNING, "Failed to allocate memory for temporary buffer\n");
+		astman_append(s, "Message: Memory allocation failure\r\n");
 		goto action_command_cleanup;
 	}
 
 	if (lseek(fd, 0, SEEK_SET) < 0) {
-		ast_log(LOG_WARNING, "Failed to set position on temporary file for command: %s\n", strerror(errno));
+		astman_append(s, "Message: Failed to set position on temporary file: %s\r\n", strerror(errno));
 		goto action_command_cleanup;
 	}
 
-	if (read(fd, buf, l) < 0) {
-		ast_log(LOG_WARNING, "read() failed: %s\n", strerror(errno));
+	if (read(fd, buf, len) < 0) {
+		astman_append(s, "Message: Failed to read from temporary file: %s\r\n", strerror(errno));
 		goto action_command_cleanup;
 	}
 
-	buf[l] = '\0';
-	term_strip(final_buf, buf, l);
-	final_buf[l] = '\0';
-	astman_append(s, "%s", final_buf);
+	buf[len] = '\0';
+	term_strip(final_buf, buf, len);
+	final_buf[len] = '\0';
+
+	/* Trim trailing newline */
+	if (len && final_buf[len - 1] == '\n') {
+		final_buf[len - 1] = '\0';
+	}
+
+	astman_append(s, "Message: Command output follows\r\n");
+
+	delim = final_buf;
+	while ((output = strsep(&delim, "\n"))) {
+		astman_append(s, "Output: %s\r\n", output);
+	}
 
 action_command_cleanup:
+	astman_append(s, "\r\n");
 
 	close(fd);
 	unlink(template);
-	astman_append(s, "--END COMMAND--\r\n\r\n");
 
 	ast_free(buf);
 	ast_free(final_buf);