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