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/*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/types.h>
#include <nftables.h>
#include <utils.h>
#include <parser.h>
#include <rule.h>
#include <netlink.h>
#include <erec.h>
#include <mnl.h>
#include <iface.h>
#include <cli.h>
unsigned int max_errors = 10;
unsigned int numeric_output;
unsigned int stateless_output;
unsigned int ip2name_output;
unsigned int handle_output;
#ifdef DEBUG
unsigned int debug_level;
#endif
const char *include_paths[INCLUDE_PATHS_MAX] = { DEFAULT_INCLUDE_PATH };
static unsigned int num_include_paths = 1;
enum opt_vals {
OPT_HELP = 'h',
OPT_VERSION = 'v',
OPT_FILE = 'f',
OPT_INTERACTIVE = 'i',
OPT_INCLUDEPATH = 'I',
OPT_NUMERIC = 'n',
OPT_STATELESS = 's',
OPT_IP2NAME = 'N',
OPT_DEBUG = 'd',
OPT_HANDLE_OUTPUT = 'a',
OPT_INVALID = '?',
};
#define OPTSTRING "hvf:iI:vnsNa"
static const struct option options[] = {
{
.name = "help",
.val = OPT_HELP,
},
{
.name = "version",
.val = OPT_VERSION,
},
{
.name = "file",
.val = OPT_FILE,
.has_arg = 1,
},
{
.name = "interactive",
.val = OPT_INTERACTIVE,
},
{
.name = "numeric",
.val = OPT_NUMERIC,
},
{
.name = "stateless",
.val = OPT_STATELESS,
},
{
.name = "reversedns",
.val = OPT_IP2NAME,
},
{
.name = "includepath",
.val = OPT_INCLUDEPATH,
.has_arg = 1,
},
#ifdef DEBUG
{
.name = "debug",
.val = OPT_DEBUG,
.has_arg = 1,
},
#endif
{
.name = "handle",
.val = OPT_HANDLE_OUTPUT,
},
{
.name = NULL
}
};
static void show_help(const char *name)
{
printf(
"Usage: %s [ options ] [ cmds... ]\n"
"\n"
"Options:\n"
" -h, --help Show this help\n"
" -v, --version Show version information\n"
"\n"
" -f, --file <filename> Read input from <filename>\n"
" -i, --interactive Read input from interactive CLI\n"
"\n"
" -n, --numeric When specified once, show network addresses numerically (default behaviour).\n"
" Specify twice to also show Internet services (port numbers) numerically.\n"
" Specify three times to also show protocols, user IDs, and group IDs numerically.\n"
" -s, --stateless Omit stateful information of ruleset.\n"
" -N Translate IP addresses to names.\n"
" -a, --handle Output rule handle.\n"
" -I, --includepath <directory> Add <directory> to the paths searched for include files.\n"
#ifdef DEBUG
" --debug <level [,level...]> Specify debugging level (scanner, parser, eval, netlink, mnl, proto-ctx, segtree, all)\n"
#endif
"\n",
name);
}
#ifdef DEBUG
static const struct {
const char *name;
enum debug_level level;
} debug_param[] = {
{
.name = "scanner",
.level = DEBUG_SCANNER,
},
{
.name = "parser",
.level = DEBUG_PARSER,
},
{
.name = "eval",
.level = DEBUG_EVALUATION,
},
{
.name = "netlink",
.level = DEBUG_NETLINK,
},
{
.name = "mnl",
.level = DEBUG_MNL,
},
{
.name = "proto-ctx",
.level = DEBUG_PROTO_CTX,
},
{
.name = "segtree",
.level = DEBUG_SEGTREE,
},
{
.name = "all",
.level = ~0,
},
};
#endif
static const struct input_descriptor indesc_cmdline = {
.type = INDESC_BUFFER,
.name = "<cmdline>",
};
static int nft_netlink(struct parser_state *state, struct list_head *msgs)
{
struct netlink_ctx ctx;
struct cmd *cmd;
struct mnl_err *err, *tmp;
LIST_HEAD(err_list);
uint32_t batch_seqnum;
bool batch_supported = netlink_batch_supported();
int ret = 0;
mnl_batch_init();
batch_seqnum = mnl_batch_begin();
list_for_each_entry(cmd, &state->cmds, list) {
memset(&ctx, 0, sizeof(ctx));
ctx.msgs = msgs;
ctx.seqnum = cmd->seqnum = mnl_seqnum_alloc();
ctx.batch_supported = batch_supported;
init_list_head(&ctx.list);
ret = do_command(&ctx, cmd);
if (ret < 0)
goto out;
}
mnl_batch_end();
if (!mnl_batch_ready())
goto out;
ret = netlink_batch_send(&err_list);
list_for_each_entry_safe(err, tmp, &err_list, head) {
list_for_each_entry(cmd, &state->cmds, list) {
if (err->seqnum == cmd->seqnum ||
err->seqnum == batch_seqnum) {
netlink_io_error(&ctx, &cmd->location,
"Could not process rule: %s",
strerror(err->err));
ret = -1;
errno = err->err;
if (err->seqnum == cmd->seqnum) {
mnl_err_list_free(err);
break;
}
}
}
}
out:
mnl_batch_reset();
return ret;
}
int nft_run(void *scanner, struct parser_state *state, struct list_head *msgs)
{
struct cmd *cmd, *next;
int ret;
ret = nft_parse(scanner, state);
if (ret != 0 || state->nerrs > 0) {
ret = -1;
goto err1;
}
ret = nft_netlink(state, msgs);
err1:
list_for_each_entry_safe(cmd, next, &state->cmds, list) {
list_del(&cmd->list);
cmd_free(cmd);
}
return ret;
}
int main(int argc, char * const *argv)
{
struct parser_state state;
void *scanner;
LIST_HEAD(msgs);
char *buf = NULL, *filename = NULL;
unsigned int len;
bool interactive = false;
int i, val, rc = NFT_EXIT_SUCCESS;
while (1) {
val = getopt_long(argc, argv, OPTSTRING, options, NULL);
if (val == -1)
break;
switch (val) {
case OPT_HELP:
show_help(argv[0]);
exit(NFT_EXIT_SUCCESS);
case OPT_VERSION:
printf("%s v%s (%s)\n",
PACKAGE_NAME, PACKAGE_VERSION, RELEASE_NAME);
exit(NFT_EXIT_SUCCESS);
case OPT_FILE:
filename = optarg;
break;
case OPT_INTERACTIVE:
interactive = true;
break;
case OPT_INCLUDEPATH:
if (num_include_paths >= INCLUDE_PATHS_MAX) {
fprintf(stderr, "Too many include paths "
"specified, max. %u\n",
INCLUDE_PATHS_MAX - 1);
exit(NFT_EXIT_FAILURE);
}
include_paths[num_include_paths++] = optarg;
break;
case OPT_NUMERIC:
if (++numeric_output > NUMERIC_ALL) {
fprintf(stderr, "Too many numeric options "
"used, max. %u\n",
NUMERIC_ALL);
exit(NFT_EXIT_FAILURE);
}
break;
case OPT_STATELESS:
stateless_output++;
break;
case OPT_IP2NAME:
ip2name_output++;
break;
#ifdef DEBUG
case OPT_DEBUG:
for (;;) {
unsigned int i;
char *end;
end = strchr(optarg, ',');
if (end)
*end = '\0';
for (i = 0; i < array_size(debug_param); i++) {
if (strcmp(debug_param[i].name, optarg))
continue;
debug_level |= debug_param[i].level;
break;
}
if (i == array_size(debug_param)) {
fprintf(stderr, "invalid debug parameter `%s'\n",
optarg);
exit(NFT_EXIT_FAILURE);
}
if (end == NULL)
break;
optarg = end + 1;
}
break;
#endif
case OPT_HANDLE_OUTPUT:
handle_output++;
break;
case OPT_INVALID:
exit(NFT_EXIT_FAILURE);
}
}
if (optind != argc) {
for (len = 0, i = optind; i < argc; i++)
len += strlen(argv[i]) + strlen(" ");
buf = xzalloc(len + 2);
for (i = optind; i < argc; i++) {
strcat(buf, argv[i]);
if (i + 1 < argc)
strcat(buf, " ");
}
strcat(buf, "\n");
parser_init(&state, &msgs);
scanner = scanner_init(&state);
scanner_push_buffer(scanner, &indesc_cmdline, buf);
} else if (filename != NULL) {
rc = cache_update(CMD_INVALID, &msgs);
if (rc < 0)
return rc;
parser_init(&state, &msgs);
scanner = scanner_init(&state);
if (scanner_read_file(scanner, filename, &internal_location) < 0)
goto out;
} else if (interactive) {
if (cli_init(&state) < 0) {
fprintf(stderr, "%s: interactive CLI not supported in this build\n",
argv[0]);
exit(NFT_EXIT_FAILURE);
}
return 0;
} else {
fprintf(stderr, "%s: no command specified\n", argv[0]);
exit(NFT_EXIT_FAILURE);
}
if (nft_run(scanner, &state, &msgs) != 0)
rc = NFT_EXIT_FAILURE;
out:
scanner_destroy(scanner);
erec_print_list(stderr, &msgs);
xfree(buf);
cache_release();
iface_cache_release();
return rc;
}
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