vtysh: Fix Quagga.conf file read in.

There exists a sequence of cli commands that are successfully read in by bgpd.conf, but
not by a consolidated Quagga.conf.

This issue stems from the fact that the consolidated config file attempts to match the
current node + 1 node up the tree, while the individual config file searches for matches
all the way up the tree.

Quagga.conf read-in relies on vtysh_cmd.c command parsing which puts all nodes
at CONFIG_NODE and if a match is found CMD_SUCCESS_DAEMON is returned.  This signals to
the parser to call the appropriate daemon with the comamnd.

bgp as an example has three levels of config node's.  If you are reading in a config node
at the 3rd level(say address-family ipv6) then transition to another node under bgp it will
not work in Quagga.conf because the code only looked up one node and was at CONFIG_BGP when it failed
to find a match.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by: Daniel Walton <dwalton@cumulusnetworks.com>

3 files changed, 54 insertions, 68 deletions

diff --git a/lib/command.c b/lib/command.c
index 20841604..37767e92 100644
--- a/lib/command.c
+++ b/lib/command.c
@@ -2794,34 +2794,69 @@ cmd_execute_command_strict (vector vline, struct vty *vty,
   return cmd_execute_command_real(vline, FILTER_STRICT, vty, cmd);
 }
 
+/**
+ * Parse one line of config, walking up the parse tree attempting to find a match
+ *
+ * @param vty The vty context in which the command should be executed.
+ * @param cmd Pointer where the struct cmd_element* of the match command
+ *            will be stored, if any.  May be set to NULL if this info is
+ *            not needed.
+ * @param use_daemon Boolean to control whether or not we match on CMD_SUCCESS_DAEMON
+ *                   or not.
+ * @return The status of the command that has been executed or an error code
+ *         as to why no command could be executed.
+ */
+int
+command_config_read_one_line (struct vty *vty, struct cmd_element **cmd, int use_daemon)
+{
+  vector vline;
+  int saved_node;
+  int ret;
+
+  vline = cmd_make_strvec (vty->buf);
+
+  /* In case of comment line */
+  if (vline == NULL)
+    return CMD_SUCCESS;
+
+  /* Execute configuration command : this is strict match */
+  ret = cmd_execute_command_strict (vline, vty, cmd);
+
+  saved_node = vty->node;
+
+  while (!(use_daemon && ret == CMD_SUCCESS_DAEMON) &&
+	 ret != CMD_SUCCESS && ret != CMD_WARNING &&
+	 ret != CMD_ERR_NOTHING_TODO && vty->node != CONFIG_NODE) {
+    vty->node = node_parent(vty->node);
+    ret = cmd_execute_command_strict (vline, vty, NULL);
+  }
+
+  // If climbing the tree did not work then ignore the command and
+  // stay at the same node
+  if (!(use_daemon && ret == CMD_SUCCESS_DAEMON) &&
+      ret != CMD_SUCCESS && ret != CMD_WARNING &&
+      ret != CMD_ERR_NOTHING_TODO)
+    {
+      vty->node = saved_node;
+    }
+
+  cmd_free_strvec (vline);
+
+  return ret;
+}
+
 /* Configration make from file. */
 int
 config_from_file (struct vty *vty, FILE *fp, unsigned int *line_num)
 {
   int ret;
   *line_num = 0;
-  vector vline;
 
   while (fgets (vty->buf, VTY_BUFSIZ, fp))
     {
       ++(*line_num);
-      vline = cmd_make_strvec (vty->buf);
-
-      /* In case of comment line */
-      if (vline == NULL)
-	continue;
-      /* Execute configuration command : this is strict match */
-      ret = cmd_execute_command_strict (vline, vty, NULL);
-
-      /* Try again with setting node to CONFIG_NODE */
-      while (ret != CMD_SUCCESS && ret != CMD_WARNING
-	     && ret != CMD_ERR_NOTHING_TODO && vty->node != CONFIG_NODE)
-	{
-	  vty->node = node_parent(vty->node);
-	  ret = cmd_execute_command_strict (vline, vty, NULL);
-	}
 
-      cmd_free_strvec (vline);
+      ret = command_config_read_one_line (vty, NULL, 0);
 
       if (ret != CMD_SUCCESS && ret != CMD_WARNING
 	  && ret != CMD_ERR_NOTHING_TODO)
diff --git a/lib/command.h b/lib/command.h
index bb0122fa..6030069a 100644
--- a/lib/command.h
+++ b/lib/command.h
@@ -527,6 +527,7 @@ extern void cmd_free_strvec (vector);
 extern vector cmd_describe_command (vector, struct vty *, int *status);
 extern char **cmd_complete_command (vector, struct vty *, int *status);
 extern const char *cmd_prompt (enum node_type);
+extern int command_config_read_one_line (struct vty *vty, struct cmd_element **, int use_config_node);
 extern int config_from_file (struct vty *, FILE *, unsigned int *line_num);
 extern enum node_type node_parent (enum node_type);
 extern int cmd_execute_command (vector, struct vty *, struct cmd_element **, int);
diff --git a/vtysh/vtysh.c b/vtysh/vtysh.c
index 783c383c..b55c6719 100644
--- a/vtysh/vtysh.c
+++ b/vtysh/vtysh.c
@@ -251,14 +251,6 @@ vtysh_client_execute (struct vtysh_client *vclient, const char *line, FILE *fp)
     }
 }
 
-static void
-vtysh_exit_ripd_only (void)
-{
-  if (ripd_client)
-    vtysh_client_execute (ripd_client, "exit", stdout);
-}
-
-
 void
 vtysh_pager_init (void)
 {
@@ -457,53 +449,11 @@ int
 vtysh_config_from_file (struct vty *vty, FILE *fp)
 {
   int ret;
-  vector vline;
   struct cmd_element *cmd;
 
   while (fgets (vty->buf, VTY_BUFSIZ, fp))
     {
-      if (vty->buf[0] == '!' || vty->buf[1] == '#')
-	continue;
-
-      vline = cmd_make_strvec (vty->buf);
-
-      /* In case of comment line. */
-      if (vline == NULL)
-	continue;
-
-      /* Execute configuration command : this is strict match. */
-      ret = cmd_execute_command_strict (vline, vty, &cmd);
-
-      /* Try again with setting node to CONFIG_NODE. */
-      if (ret != CMD_SUCCESS 
-	  && ret != CMD_SUCCESS_DAEMON
-	  && ret != CMD_WARNING)
-	{
-	  if (vty->node == KEYCHAIN_KEY_NODE)
-	    {
-	      vty->node = KEYCHAIN_NODE;
-	      vtysh_exit_ripd_only ();
-	      ret = cmd_execute_command_strict (vline, vty, &cmd);
-
-	      if (ret != CMD_SUCCESS 
-		  && ret != CMD_SUCCESS_DAEMON 
-		  && ret != CMD_WARNING)
-		{
-		  vtysh_exit_ripd_only ();
-		  vty->node = CONFIG_NODE;
-		  ret = cmd_execute_command_strict (vline, vty, &cmd);
-		}
-	    }
-	  else
-	    {
-	      vtysh_execute ("end");
-	      vtysh_execute ("configure terminal");
-	      vty->node = CONFIG_NODE;
-	      ret = cmd_execute_command_strict (vline, vty, &cmd);
-	    }
-	}	  
-
-      cmd_free_strvec (vline);
+      ret = command_config_read_one_line (vty, &cmd, 1);
 
       switch (ret)
 	{