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/*
* src/nf-log.c Monitor netfilter log events
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
* Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
* Copyright (c) 2007 Secure Computing Corporation
*/
#include "log-utils.h"
static void obj_input(struct nl_object *obj, void *arg)
{
struct nl_dump_params dp = {
.dp_type = NL_DUMP_STATS,
.dp_fd = stdout,
.dp_dump_msgtype = 1,
};
nl_object_dump(obj, &dp);
}
static int event_input(struct nl_msg *msg, void *arg)
{
if (nl_msg_parse(msg, &obj_input, NULL) < 0)
fprintf(stderr, "<<EVENT>> Unknown message type\n");
/* Exit nl_recvmsgs_def() and return to the main select() */
return NL_STOP;
}
int main(int argc, char *argv[])
{
struct nl_sock *nf_sock;
struct nl_sock *rt_sock;
struct nl_cache *link_cache;
struct nfnl_log *log;
enum nfnl_log_copy_mode copy_mode;
uint32_t copy_range;
int err;
int family;
nf_sock = nlt_alloc_socket();
nl_socket_disable_seq_check(nf_sock);
nl_socket_modify_cb(nf_sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
if ((argc > 1 && !strcasecmp(argv[1], "-h")) || argc < 3) {
printf("Usage: nf-log family group [ copy_mode ] "
"[copy_range] \n");
return 2;
}
nlt_connect(nf_sock, NETLINK_NETFILTER);
family = nl_str2af(argv[1]);
if (family == AF_UNSPEC)
fatal(NLE_INVAL, "Unknown family \"%s\": %s",
argv[1], nl_geterror(family));
nfnl_log_pf_unbind(nf_sock, family);
if ((err = nfnl_log_pf_bind(nf_sock, family)) < 0)
fatal(err, "Unable to bind logger: %s", nl_geterror(err));
log = nlt_alloc_log();
nfnl_log_set_group(log, atoi(argv[2]));
copy_mode = NFNL_LOG_COPY_META;
if (argc > 3) {
copy_mode = nfnl_log_str2copy_mode(argv[3]);
if (copy_mode < 0)
fatal(copy_mode, "Unable to parse copy mode \"%s\": %s",
argv[3], nl_geterror(copy_mode));
}
nfnl_log_set_copy_mode(log, copy_mode);
copy_range = 0xFFFF;
if (argc > 4)
copy_mode = atoi(argv[4]);
nfnl_log_set_copy_range(log, copy_range);
if ((err = nfnl_log_create(nf_sock, log)) < 0)
fatal(err, "Unable to bind instance: %s", nl_geterror(err));
{
struct nl_dump_params dp = {
.dp_type = NL_DUMP_STATS,
.dp_fd = stdout,
.dp_dump_msgtype = 1,
};
printf("log params: ");
nl_object_dump((struct nl_object *) log, &dp);
}
rt_sock = nlt_alloc_socket();
nlt_connect(rt_sock, NETLINK_ROUTE);
link_cache = nlt_alloc_link_cache(rt_sock);
while (1) {
fd_set rfds;
int nffd, rtfd, maxfd, retval;
FD_ZERO(&rfds);
maxfd = nffd = nl_socket_get_fd(nf_sock);
FD_SET(nffd, &rfds);
rtfd = nl_socket_get_fd(rt_sock);
FD_SET(rtfd, &rfds);
if (maxfd < rtfd)
maxfd = rtfd;
/* wait for an incoming message on the netlink nf_socket */
retval = select(maxfd+1, &rfds, NULL, NULL, NULL);
if (retval) {
if (FD_ISSET(nffd, &rfds))
nl_recvmsgs_default(nf_sock);
if (FD_ISSET(rtfd, &rfds))
nl_recvmsgs_default(rt_sock);
}
}
return 0;
}
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