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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 <netlink/cli/utils.h>
#include <netlink/cli/link.h>
#include <linux/netfilter/nfnetlink_log.h>
#include <netlink/netfilter/nfnl.h>
#include <netlink/netfilter/log.h>

static struct nfnl_log *alloc_log(void)
{
        struct nfnl_log *log;

        log = nfnl_log_alloc();
        if (!log)
                nl_cli_fatal(ENOMEM, "Unable to allocate log object");

        return log;
}

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 = nl_cli_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;
        }

        nl_cli_connect(nf_sock, NETLINK_NETFILTER);

        family = nl_str2af(argv[1]);
        if (family == AF_UNSPEC)
                nl_cli_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)
                nl_cli_fatal(err, "Unable to bind logger: %s",
                             nl_geterror(err));

        log = 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)
                        nl_cli_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)
                nl_cli_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 = nl_cli_alloc_socket();
        nl_cli_connect(rt_sock, NETLINK_ROUTE);
        link_cache = nl_cli_link_alloc_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;
}