// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Test code for lib/command.c
 *
 * Copyright (C) 2013 by Open Source Routing.
 * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
 *
 * This program reads in a list of commandlines from stdin
 * and calls all the public functions of lib/command.c for
 * both the given command lines and fuzzed versions thereof.
 *
 * The output is currently not validated but only logged. It can
 * be diffed to find regressions between versions.
 */

#define REALLY_NEED_PLAIN_GETOPT 1

#include <zebra.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "command.h"
#include "memory.h"
#include "vector.h"
#include "prng.h"

extern vector cmdvec;
extern struct cmd_node vty_node;
extern void test_init_cmd(void); /* provided in test-commands-defun.c */

struct event_loop *master; /* dummy for libfrr*/

static vector test_cmds;
static char test_buf[32768];

static struct cmd_node bgp_node = {
	.name = "bgp",
	.node = BGP_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-router)# ",
};

static struct cmd_node rip_node = {
	.name = "rip",
	.node = RIP_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-router)# ",
};

static struct cmd_node isis_node = {
	.name = "isis",
	.node = ISIS_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-router)# ",
};

static struct cmd_node interface_node = {
	.name = "interface",
	.node = INTERFACE_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-if)# ",
};

static struct cmd_node rmap_node = {
	.name = "routemap",
	.node = RMAP_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-route-map)# ",
};

static struct cmd_node zebra_node = {
	.name = "zebra",
	.node = ZEBRA_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-router)# ",
};

static struct cmd_node bgp_vpnv4_node = {
	.name = "bgp vpnv4",
	.node = BGP_VPNV4_NODE,
	.parent_node = BGP_NODE,
	.prompt = "%s(config-router-af)# ",
};

static struct cmd_node bgp_ipv4_node = {
	.name = "bgp ipv4 unicast",
	.node = BGP_IPV4_NODE,
	.parent_node = BGP_NODE,
	.prompt = "%s(config-router-af)# ",
};

static struct cmd_node bgp_ipv4m_node = {
	.name = "bgp ipv4 multicast",
	.node = BGP_IPV4M_NODE,
	.parent_node = BGP_NODE,
	.prompt = "%s(config-router-af)# ",
};

static struct cmd_node bgp_ipv6_node = {
	.name = "bgp ipv6",
	.node = BGP_IPV6_NODE,
	.parent_node = BGP_NODE,
	.prompt = "%s(config-router-af)# ",
};

static struct cmd_node bgp_ipv6m_node = {
	.name = "bgp ipv6 multicast",
	.node = BGP_IPV6M_NODE,
	.parent_node = BGP_NODE,
	.prompt = "%s(config-router-af)# ",
};

static struct cmd_node ospf_node = {
	.name = "ospf",
	.node = OSPF_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-router)# ",
};

static struct cmd_node ripng_node = {
	.name = "ripng",
	.node = RIPNG_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-router)# ",
};

static struct cmd_node ospf6_node = {
	.name = "ospf6",
	.node = OSPF6_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-ospf6)# ",
};

static struct cmd_node keychain_node = {
	.name = "keychain",
	.node = KEYCHAIN_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-keychain)# ",
};

static struct cmd_node keychain_key_node = {
	.name = "keychain key",
	.node = KEYCHAIN_KEY_NODE,
	.parent_node = KEYCHAIN_NODE,
	.prompt = "%s(config-keychain-key)# ",
};

static int test_callback(const struct cmd_element *cmd, struct vty *vty,
			 int argc, struct cmd_token *argv[])
{
	int offset;
	int rv;
	int i;

	offset = 0;
	rv = snprintf(test_buf, sizeof(test_buf), "'%s'", cmd->string);
	if (rv < 0)
		abort();

	offset += rv;

	for (i = 0; i < argc; i++) {
		rv = snprintf(test_buf + offset, sizeof(test_buf) - offset,
			      "%s'%s'", (i == 0) ? ": " : ", ", argv[i]->arg);
		if (rv < 0)
			abort();
		offset += rv;
	}

	return CMD_SUCCESS;
}

static void test_load(void)
{
	char line[4096];

	test_cmds = vector_init(VECTOR_MIN_SIZE);

	while (fgets(line, sizeof(line), stdin) != NULL) {
		if (strlen(line))
			line[strlen(line) - 1] = '\0';
		if (line[0] == '#')
			continue;
		vector_set(test_cmds, XSTRDUP(MTYPE_TMP, line));
	}
}

static void test_init(void)
{
	unsigned int node;
	unsigned int i;
	struct cmd_node *cnode;
	struct cmd_element *cmd;

	cmd_init(1);
	nb_init(master, NULL, 0, false);

	install_node(&bgp_node);
	install_node(&rip_node);
	install_node(&interface_node);
	install_node(&rmap_node);
	install_node(&zebra_node);
	install_node(&bgp_vpnv4_node);
	install_node(&bgp_ipv4_node);
	install_node(&bgp_ipv4m_node);
	install_node(&bgp_ipv6_node);
	install_node(&bgp_ipv6m_node);
	install_node(&ospf_node);
	install_node(&ripng_node);
	install_node(&ospf6_node);
	install_node(&keychain_node);
	install_node(&keychain_key_node);
	install_node(&isis_node);
	install_node(&vty_node);

	test_init_cmd();

	for (node = 0; node < vector_active(cmdvec); node++)
		if ((cnode = vector_slot(cmdvec, node)) != NULL)
			for (i = 0; i < vector_active(cnode->cmd_vector); i++)
				if ((cmd = vector_slot(cnode->cmd_vector, i))
				    != NULL) {
					cmd->daemon = 0;
					cmd->func = test_callback;
				}
	test_load();
	vty_init_vtysh();
}

static void test_terminate(void)
{
	unsigned int i;

	vty_terminate();
	for (i = 0; i < vector_active(test_cmds); i++)
		XFREE(MTYPE_TMP, vector_slot(test_cmds, i));
	vector_free(test_cmds);
	cmd_terminate();
	nb_terminate();
	yang_terminate();
}

static void test_run(struct prng *prng, struct vty *vty, const char *cmd,
		     unsigned int edit_dist, unsigned int node_index,
		     int verbose)
{
	const char *test_str;
	vector vline;
	int ret;
	unsigned int i;
	char **completions;
	unsigned int j;
	struct cmd_node *cnode;
	vector descriptions;
	int appended_null;
	int no_match;

	test_str = prng_fuzz(
		prng, cmd,
		"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_:. /",
		edit_dist);
	vline = cmd_make_strvec(test_str);

	if (vline == NULL)
		return;

	appended_null = 0;
	for (i = 0; i < vector_active(cmdvec); i++)
		if ((cnode = vector_slot(cmdvec, i)) != NULL) {
			if (node_index != (unsigned int)-1 && i != node_index)
				continue;

			if (appended_null) {
				vector_unset(vline, vector_active(vline) - 1);
				appended_null = 0;
			}
			vty->node = cnode->node;
			test_buf[0] = '\0';
			ret = cmd_execute_command(vline, vty, NULL, 0);
			no_match = (ret == CMD_ERR_NO_MATCH);
			if (verbose || !no_match)
				printf("execute relaxed '%s'@%d: rv==%d%s%s\n",
				       test_str, cnode->node, ret,
				       (test_buf[0] != '\0') ? ", " : "",
				       test_buf);

			vty->node = cnode->node;
			test_buf[0] = '\0';
			ret = cmd_execute_command_strict(vline, vty, NULL);
			if (verbose || !no_match)
				printf("execute strict '%s'@%d: rv==%d%s%s\n",
				       test_str, cnode->node, ret,
				       (test_buf[0] != '\0') ? ", " : "",
				       test_buf);

			if (isspace((unsigned char)test_str[
				    strlen(test_str) - 1])) {
				vector_set(vline, NULL);
				appended_null = 1;
			}

			vty->node = cnode->node;
			completions = cmd_complete_command(vline, vty, &ret);
			if (verbose || !no_match)
				printf("complete '%s'@%d: rv==%d\n", test_str,
				       cnode->node, ret);
			if (completions != NULL) {
				for (j = 0; completions[j] != NULL; j++) {
					printf("  '%s'\n", completions[j]);
					XFREE(MTYPE_TMP, completions[j]);
				}
				XFREE(MTYPE_TMP, completions);
			}

			vty->node = cnode->node;
			descriptions = cmd_describe_command(vline, vty, &ret);
			if (verbose || !no_match)
				printf("describe '%s'@%d: rv==%d\n", test_str,
				       cnode->node, ret);
			if (descriptions != NULL) {
				for (j = 0; j < vector_active(descriptions);
				     j++) {
					struct cmd_token *ct =
						vector_slot(descriptions, j);
					printf("  '%s' '%s'\n", ct->text,
					       ct->desc);
				}
				vector_free(descriptions);
			}
		}
	cmd_free_strvec(vline);
}

int main(int argc, char **argv)
{
	int opt;
	struct prng *prng;
	struct vty *vty;
	unsigned int edit_distance;
	unsigned int max_edit_distance;
	unsigned int node_index;
	int verbose;
	unsigned int test_cmd;
	unsigned int iteration;
	unsigned int num_iterations;

	max_edit_distance = 3;
	node_index = -1;
	verbose = 0;

	while ((opt = getopt(argc, argv, "e:n:v")) != -1) {
		switch (opt) {
		case 'e':
			max_edit_distance = atoi(optarg);
			break;
		case 'n':
			node_index = atoi(optarg);
			break;
		case 'v':
			verbose++;
			break;
		default:
			fprintf(stderr,
				"Usage: %s [-e <edit_dist>] [-n <node_idx>] [-v]\n",
				argv[0]);
			exit(1);
			break;
		}
	}

	test_init();
	prng = prng_new(0);

	vty = vty_new();
	vty->type = VTY_TERM;

	fprintf(stderr, "Progress:\n0/%u", vector_active(test_cmds));
	for (test_cmd = 0; test_cmd < vector_active(test_cmds); test_cmd++) {
		for (edit_distance = 0; edit_distance <= max_edit_distance;
		     edit_distance++) {
			num_iterations = 1 << edit_distance;
			num_iterations *= num_iterations * num_iterations;

			for (iteration = 0; iteration < num_iterations;
			     iteration++)
				test_run(prng, vty,
					 vector_slot(test_cmds, test_cmd),
					 edit_distance, node_index, verbose);
		}
		fprintf(stderr, "\r%u/%u", test_cmd + 1,
			vector_active(test_cmds));
	}
	fprintf(stderr, "\nDone.\n");

	vty_close(vty);
	prng_free(prng);
	test_terminate();
	return 0;
}