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/*
* Testing shim and API examples for the new CLI backend.
*
* This unit defines a number of commands in the old engine that can
* be used to test and interact with the new engine.
* --
* Copyright (C) 2016 Cumulus Networks, Inc.
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "command.h"
#include "memory_vty.h"
#include "graph.h"
#include "linklist.h"
#include "command_match.h"
#define GRAMMAR_STR "CLI grammar sandbox\n"
DEFINE_MTYPE_STATIC(LIB, CMD_TOKENS, "Command desc")
/** headers **/
void grammar_sandbox_init(void);
void pretty_print_graph(struct vty *vty, struct graph_node *, int, int,
struct graph_node **, size_t);
void init_cmdgraph(struct vty *, struct graph **);
/** shim interface commands **/
struct graph *nodegraph = NULL, *nodegraph_free = NULL;
#define check_nodegraph() \
do { \
if (!nodegraph) { \
vty_out(vty, "nodegraph not initialized\n"); \
return CMD_WARNING; \
} \
} while (0)
DEFUN (grammar_test,
grammar_test_cmd,
"grammar parse LINE...",
GRAMMAR_STR
"parse a command\n"
"command to pass to new parser\n")
{
check_nodegraph();
int idx_command = 2;
// make a string from tokenized command line
char *command = argv_concat(argv, argc, idx_command);
// create cmd_element for parser
struct cmd_element *cmd =
XCALLOC(MTYPE_CMD_TOKENS, sizeof(struct cmd_element));
cmd->string = command;
cmd->doc =
"0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n";
cmd->func = NULL;
// parse the command and install it into the command graph
struct graph *graph = graph_new();
struct cmd_token *token =
cmd_token_new(START_TKN, CMD_ATTR_NORMAL, NULL, NULL);
graph_new_node(graph, token, (void (*)(void *)) & cmd_token_del);
cmd_graph_parse(graph, cmd);
cmd_graph_merge(nodegraph, graph, +1);
return CMD_SUCCESS;
}
DEFUN (grammar_test_complete,
grammar_test_complete_cmd,
"grammar complete COMMAND...",
GRAMMAR_STR
"attempt to complete input on DFA\n"
"command to complete\n")
{
check_nodegraph();
int idx_command = 2;
char *cmdstr = argv_concat(argv, argc, idx_command);
if (!cmdstr)
return CMD_SUCCESS;
vector command = cmd_make_strvec(cmdstr);
if (!command) {
XFREE(MTYPE_TMP, cmdstr);
return CMD_SUCCESS;
}
// generate completions of user input
struct list *completions;
enum matcher_rv result =
command_complete(nodegraph, command, &completions);
// print completions or relevant error message
if (!MATCHER_ERROR(result)) {
vector comps = completions_to_vec(completions);
struct cmd_token *tkn;
// calculate length of longest tkn->text in completions
unsigned int width = 0, i = 0;
for (i = 0; i < vector_active(comps); i++) {
tkn = vector_slot(comps, i);
unsigned int len = strlen(tkn->text);
width = len > width ? len : width;
}
// print completions
for (i = 0; i < vector_active(comps); i++) {
tkn = vector_slot(comps, i);
vty_out(vty, " %-*s %s\n", width, tkn->text,
tkn->desc);
}
for (i = 0; i < vector_active(comps); i++)
cmd_token_del(
(struct cmd_token *)vector_slot(comps, i));
vector_free(comps);
} else
vty_out(vty, "%% No match\n");
// free resources
list_delete_and_null(&completions);
cmd_free_strvec(command);
XFREE(MTYPE_TMP, cmdstr);
return CMD_SUCCESS;
}
DEFUN (grammar_test_match,
grammar_test_match_cmd,
"grammar match COMMAND...",
GRAMMAR_STR
"attempt to match input on DFA\n"
"command to match\n")
{
check_nodegraph();
int idx_command = 2;
if (argv[2]->arg[0] == '#')
return CMD_SUCCESS;
char *cmdstr = argv_concat(argv, argc, idx_command);
if (!cmdstr)
return CMD_SUCCESS;
vector command = cmd_make_strvec(cmdstr);
if (!command) {
XFREE(MTYPE_TMP, cmdstr);
return CMD_SUCCESS;
}
struct list *argvv = NULL;
const struct cmd_element *element = NULL;
enum matcher_rv result =
command_match(nodegraph, command, &argvv, &element);
// print completions or relevant error message
if (element) {
vty_out(vty, "Matched: %s\n", element->string);
struct listnode *ln;
struct cmd_token *token;
for (ALL_LIST_ELEMENTS_RO(argvv, ln, token))
vty_out(vty, "%s -- %s\n", token->text, token->arg);
vty_out(vty, "func: %p\n", element->func);
list_delete_and_null(&argvv);
} else {
assert(MATCHER_ERROR(result));
switch (result) {
case MATCHER_NO_MATCH:
vty_out(vty, "%% Unknown command\n");
break;
case MATCHER_INCOMPLETE:
vty_out(vty, "%% Incomplete command\n");
break;
case MATCHER_AMBIGUOUS:
vty_out(vty, "%% Ambiguous command\n");
break;
default:
vty_out(vty, "%% Unknown error\n");
break;
}
}
// free resources
cmd_free_strvec(command);
XFREE(MTYPE_TMP, cmdstr);
return CMD_SUCCESS;
}
/**
* Testing shim to test docstrings
*/
DEFUN (grammar_test_doc,
grammar_test_doc_cmd,
"grammar test docstring",
GRAMMAR_STR
"Test function for docstring\n"
"Command end\n")
{
check_nodegraph();
// create cmd_element with docstring
struct cmd_element *cmd =
XCALLOC(MTYPE_CMD_TOKENS, sizeof(struct cmd_element));
cmd->string = XSTRDUP(
MTYPE_CMD_TOKENS,
"test docstring <example|selector follow> (1-255) end VARIABLE [OPTION|set lol] . VARARG");
cmd->doc = XSTRDUP(MTYPE_CMD_TOKENS,
"Test stuff\n"
"docstring thing\n"
"first example\n"
"second example\n"
"follow\n"
"random range\n"
"end thingy\n"
"variable\n"
"optional variable\n"
"optional set\n"
"optional lol\n"
"vararg!\n");
cmd->func = NULL;
// parse element
cmd_graph_parse(nodegraph, cmd);
return CMD_SUCCESS;
}
/**
* Debugging command to print command graph
*/
DEFUN (grammar_test_show,
grammar_test_show_cmd,
"grammar show [doc]",
GRAMMAR_STR
"print current accumulated DFA\n"
"include docstrings\n")
{
check_nodegraph();
struct graph_node *stack[CMD_ARGC_MAX];
pretty_print_graph(vty, vector_slot(nodegraph->nodes, 0), 0, argc >= 3,
stack, 0);
return CMD_SUCCESS;
}
DEFUN (grammar_test_dot,
grammar_test_dot_cmd,
"grammar dotfile OUTNAME",
GRAMMAR_STR
"print current graph for dot\n"
".dot filename\n")
{
check_nodegraph();
FILE *ofd = fopen(argv[2]->arg, "w");
if (!ofd) {
vty_out(vty, "%s: %s\r\n", argv[2]->arg, strerror(errno));
return CMD_SUCCESS;
}
char *dot = cmd_graph_dump_dot(nodegraph);
fprintf(ofd, "%s", dot);
fclose(ofd);
XFREE(MTYPE_TMP, dot);
return CMD_SUCCESS;
}
struct cmd_permute_item {
char *cmd;
struct cmd_element *el;
};
static void cmd_permute_free(void *arg)
{
struct cmd_permute_item *i = arg;
XFREE(MTYPE_TMP, i->cmd);
XFREE(MTYPE_TMP, i);
}
static int cmd_permute_cmp(void *a, void *b)
{
struct cmd_permute_item *aa = a, *bb = b;
return strcmp(aa->cmd, bb->cmd);
}
static void cmd_graph_permute(struct list *out, struct graph_node **stack,
size_t stackpos, char *cmd)
{
struct graph_node *gn = stack[stackpos];
struct cmd_token *tok = gn->data;
char *appendp = cmd + strlen(cmd);
size_t j;
if (tok->type < SPECIAL_TKN) {
sprintf(appendp, "%s ", tok->text);
appendp += strlen(appendp);
} else if (tok->type == END_TKN) {
struct cmd_permute_item *i = XMALLOC(MTYPE_TMP, sizeof(*i));
i->el = ((struct graph_node *)vector_slot(gn->to, 0))->data;
i->cmd = XSTRDUP(MTYPE_TMP, cmd);
i->cmd[strlen(cmd) - 1] = '\0';
listnode_add_sort(out, i);
return;
}
if (++stackpos == CMD_ARGC_MAX)
return;
for (size_t i = 0; i < vector_active(gn->to); i++) {
struct graph_node *gnext = vector_slot(gn->to, i);
for (j = 0; j < stackpos; j++)
if (stack[j] == gnext)
break;
if (j != stackpos)
continue;
stack[stackpos] = gnext;
*appendp = '\0';
cmd_graph_permute(out, stack, stackpos, cmd);
}
}
static struct list *cmd_graph_permutations(struct graph *graph)
{
char accumulate[2048] = "";
struct graph_node *stack[CMD_ARGC_MAX];
struct list *rv = list_new();
rv->cmp = cmd_permute_cmp;
rv->del = cmd_permute_free;
stack[0] = vector_slot(graph->nodes, 0);
cmd_graph_permute(rv, stack, 0, accumulate);
return rv;
}
extern vector cmdvec;
DEFUN (grammar_findambig,
grammar_findambig_cmd,
"grammar find-ambiguous [{printall|nodescan}]",
GRAMMAR_STR
"Find ambiguous commands\n"
"Print all permutations\n"
"Scan all nodes\n")
{
struct list *commands;
struct cmd_permute_item *prev = NULL, *cur = NULL;
struct listnode *ln;
int i, printall, scan, scannode = 0;
int ambig = 0;
i = 0;
printall = argv_find(argv, argc, "printall", &i);
i = 0;
scan = argv_find(argv, argc, "nodescan", &i);
if (scan && nodegraph_free) {
graph_delete_graph(nodegraph_free);
nodegraph_free = NULL;
}
if (!scan && !nodegraph) {
vty_out(vty, "nodegraph uninitialized\r\n");
return CMD_WARNING_CONFIG_FAILED;
}
do {
if (scan) {
struct cmd_node *cnode =
vector_slot(cmdvec, scannode++);
if (!cnode)
continue;
nodegraph = cnode->cmdgraph;
if (!nodegraph)
continue;
vty_out(vty, "scanning node %d (%s)\n", scannode - 1,
node_names[scannode - 1]);
}
commands = cmd_graph_permutations(nodegraph);
prev = NULL;
for (ALL_LIST_ELEMENTS_RO(commands, ln, cur)) {
int same = prev && !strcmp(prev->cmd, cur->cmd);
if (printall && !same)
vty_out(vty, "'%s' [%x]\n", cur->cmd,
cur->el->daemon);
if (same) {
vty_out(vty, "'%s' AMBIGUOUS:\n", cur->cmd);
vty_out(vty, " %s\n '%s'\n", prev->el->name,
prev->el->string);
vty_out(vty, " %s\n '%s'\n", cur->el->name,
cur->el->string);
vty_out(vty, "\n");
ambig++;
}
prev = cur;
}
list_delete_and_null(&commands);
vty_out(vty, "\n");
} while (scan && scannode < LINK_PARAMS_NODE);
vty_out(vty, "%d ambiguous commands found.\n", ambig);
if (scan)
nodegraph = NULL;
return ambig == 0 ? CMD_SUCCESS : CMD_WARNING_CONFIG_FAILED;
}
DEFUN (grammar_init_graph,
grammar_init_graph_cmd,
"grammar init",
GRAMMAR_STR
"(re)initialize graph\n")
{
if (nodegraph_free)
graph_delete_graph(nodegraph_free);
nodegraph_free = NULL;
init_cmdgraph(vty, &nodegraph);
return CMD_SUCCESS;
}
DEFUN (grammar_access,
grammar_access_cmd,
"grammar access (0-65535)",
GRAMMAR_STR
"access node graph\n"
"node number\n")
{
if (nodegraph_free)
graph_delete_graph(nodegraph_free);
nodegraph_free = NULL;
struct cmd_node *cnode;
cnode = vector_slot(cmdvec, atoi(argv[2]->arg));
if (!cnode) {
vty_out(vty, "%% no such node\n");
return CMD_WARNING_CONFIG_FAILED;
}
vty_out(vty, "node %d\n", (int)cnode->node);
nodegraph = cnode->cmdgraph;
return CMD_SUCCESS;
}
/* this is called in vtysh.c to set up the testing shim */
void grammar_sandbox_init(void)
{
// install all enable elements
install_element(ENABLE_NODE, &grammar_test_cmd);
install_element(ENABLE_NODE, &grammar_test_show_cmd);
install_element(ENABLE_NODE, &grammar_test_dot_cmd);
install_element(ENABLE_NODE, &grammar_test_match_cmd);
install_element(ENABLE_NODE, &grammar_test_complete_cmd);
install_element(ENABLE_NODE, &grammar_test_doc_cmd);
install_element(ENABLE_NODE, &grammar_findambig_cmd);
install_element(ENABLE_NODE, &grammar_init_graph_cmd);
install_element(ENABLE_NODE, &grammar_access_cmd);
}
/**
* Pretty-prints a graph, assuming it is a tree.
*
* @param start the node to take as the root
* @param level indent level for recursive calls, always pass 0
*/
void pretty_print_graph(struct vty *vty, struct graph_node *start, int level,
int desc, struct graph_node **stack, size_t stackpos)
{
// print this node
char tokennum[32];
struct cmd_token *tok = start->data;
snprintf(tokennum, sizeof(tokennum), "%d?", tok->type);
vty_out(vty, "%s", lookup_msg(tokennames, tok->type, NULL));
if (tok->text)
vty_out(vty, ":\"%s\"", tok->text);
if (tok->varname)
vty_out(vty, " => %s", tok->varname);
if (desc)
vty_out(vty, " ?'%s'", tok->desc);
vty_out(vty, " ");
if (stackpos == CMD_ARGC_MAX) {
vty_out(vty, " -aborting! (depth limit)\n");
return;
}
stack[stackpos++] = start;
int numto = desc ? 2 : vector_active(start->to);
if (numto) {
if (numto > 1)
vty_out(vty, "\n");
for (unsigned int i = 0; i < vector_active(start->to); i++) {
struct graph_node *adj = vector_slot(start->to, i);
// if we're listing multiple children, indent!
if (numto > 1)
for (int j = 0; j < level + 1; j++)
vty_out(vty, " ");
// if this node is a vararg, just print *
if (adj == start)
vty_out(vty, "*");
else if (((struct cmd_token *)adj->data)->type
== END_TKN)
vty_out(vty, "--END\n");
else {
size_t k;
for (k = 0; k < stackpos; k++)
if (stack[k] == adj) {
vty_out(vty, "<<loop@%zu \n",
k);
break;
}
if (k == stackpos)
pretty_print_graph(
vty, adj,
numto > 1 ? level + 1 : level,
desc, stack, stackpos);
}
}
} else
vty_out(vty, "\n");
}
/** stuff that should go in command.c + command.h */
void init_cmdgraph(struct vty *vty, struct graph **graph)
{
// initialize graph, add start noe
*graph = graph_new();
nodegraph_free = *graph;
struct cmd_token *token = cmd_token_new(START_TKN, 0, NULL, NULL);
graph_new_node(*graph, token, (void (*)(void *)) & cmd_token_del);
if (vty)
vty_out(vty, "initialized graph\n");
}
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