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/*
* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This code has been sponsored by Vyatta Inc. <http://www.vyatta.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include <netinet/in.h>
#include <errno.h>
#include <libmnl/libmnl.h>
#include "linux_list.h"
#include "nfct.h"
static int nfct_cmd_version(int argc, char *argv[]);
static int nfct_cmd_help(int argc, char *argv[]);
static void usage(char *argv[])
{
fprintf(stderr, "Usage: %s subsystem command [parameters]...\n",
argv[0]);
}
void nfct_perror(const char *msg)
{
if (errno == 0) {
fprintf(stderr, "nfct v%s: %s\n", VERSION, msg);
} else {
fprintf(stderr, "nfct v%s: %s: %s\n",
VERSION, msg, strerror(errno));
}
}
static LIST_HEAD(nfct_extension_list);
void nfct_extension_register(struct nfct_extension *ext)
{
list_add(&ext->head, &nfct_extension_list);
}
static struct nfct_extension *nfct_extension_lookup(int type)
{
struct nfct_extension *ext;
list_for_each_entry(ext, &nfct_extension_list, head) {
if (ext->type == type)
return ext;
}
return NULL;
}
int main(int argc, char *argv[])
{
int subsys = NFCT_SUBSYS_NONE, ret = 0;
struct nfct_extension *ext;
struct mnl_socket *nl;
if (argc < 2) {
usage(argv);
exit(EXIT_FAILURE);
}
if (strncmp(argv[1], "timeout", strlen(argv[1])) == 0) {
subsys = NFCT_SUBSYS_TIMEOUT;
} else if (strncmp(argv[1], "helper", strlen(argv[1])) == 0) {
subsys = NFCT_SUBSYS_HELPER;
} else if (strncmp(argv[1], "version", strlen(argv[1])) == 0)
subsys = NFCT_SUBSYS_VERSION;
else if (strncmp(argv[1], "help", strlen(argv[1])) == 0)
subsys = NFCT_SUBSYS_HELP;
else {
fprintf(stderr, "nfct v%s: Unknown subsystem: %s\n",
VERSION, argv[1]);
usage(argv);
exit(EXIT_FAILURE);
}
switch(subsys) {
case NFCT_SUBSYS_VERSION:
ret = nfct_cmd_version(argc, argv);
break;
case NFCT_SUBSYS_HELP:
ret = nfct_cmd_help(argc, argv);
break;
default:
ext = nfct_extension_lookup(subsys);
if (ext == NULL) {
fprintf(stderr, "nfct v%s: subsystem %s not supported\n",
VERSION, argv[1]);
return EXIT_FAILURE;
}
nl = nfct_mnl_open();
if (nl == NULL) {
nfct_perror("cannot open netlink");
return -1;
}
ret = ext->parse_params(nl, argc, argv);
mnl_socket_close(nl);
break;
}
return ret < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
static const char version_msg[] =
"nfct v%s: utility for the Netfilter's Connection Tracking System\n"
"Copyright (C) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n"
"This program comes with ABSOLUTELY NO WARRANTY.\n"
"This is free software, and you are welcome to redistribute it under "
"certain \nconditions; see LICENSE file distributed in this package "
"for details.\n";
static int nfct_cmd_version(int argc, char *argv[])
{
printf(version_msg, VERSION);
return 0;
}
static const char help_msg[] =
"nfct v%s: utility for the Netfilter's Connection Tracking System\n"
"Usage: %s command [parameters]...\n\n"
"Subsystem:\n"
" helper\t\tAllows to configure user-space helper\n"
" timeout\t\tAllows definition of fine-grain timeout policies\n"
" version\t\tDisplay version and disclaimer\n"
" help\t\t\tDisplay this help message\n"
"Commands:\n"
" list [reset]\t\tList the accounting object table (and reset)\n"
" add object-name\tAdd new accounting object to table\n"
" delete object-name\tDelete existing accounting object\n"
" get object-name\tGet existing accounting object\n"
" flush\t\t\tFlush accounting object table\n";
static int nfct_cmd_help(int argc, char *argv[])
{
printf(help_msg, VERSION, argv[0]);
return 0;
}
int nfct_mnl_talk(struct mnl_socket *nl, struct nlmsghdr *nlh,
uint32_t seq, uint32_t portid,
int (*cb)(const struct nlmsghdr *nlh, void *data),
void *data)
{
int ret;
char buf[MNL_SOCKET_BUFFER_SIZE];
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0)
return -1;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, seq, portid, cb, data);
if (ret <= 0)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1)
return -1;
return 0;
}
struct mnl_socket *nfct_mnl_open(void)
{
struct mnl_socket *nl;
nl = mnl_socket_open(NETLINK_NETFILTER);
if (nl == NULL)
return NULL;
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
return NULL;
return nl;
}
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