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nf-log.c

/*
 * 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) 2003-2006 Thomas Graf <tgraf@suug.ch>
 * Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
 * Copyright (c) 2007 Secure Computing Corporation
 */

#include <sys/types.h>
#include <linux/netfilter/nfnetlink_log.h>

#include "utils.h"
#include <netlink/netfilter/nfnl.h>
#include <netlink/netfilter/log.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_handle *nfnlh;
      struct nl_handle *rtnlh;
        struct nl_cache *link_cache;
      int err = 1;
      int family, group;

      if (nltool_init(argc, argv) < 0)
            return -1;

      nfnlh = nltool_alloc_handle();
      if (nfnlh == NULL)
            return -1;

      nl_disable_sequence_check(nfnlh);

      nl_socket_modify_cb(nfnlh, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);

      if ((argc > 1 && !strcasecmp(argv[1], "-h")) || argc < 3) {
            printf("Usage: nf-log family group\n");
            return 2;
      }

      if (nfnl_connect(nfnlh) < 0) {
            fprintf(stderr, "%s\n", nl_geterror());
            goto errout;
      }

      family = nl_str2af(argv[1]);
      if (family == AF_UNSPEC) {
            fprintf(stderr, "Unknown family: %s\n", argv[1]);
            goto errout;
      }
      if (nfnl_log_pf_unbind(nfnlh, family) < 0) {
            fprintf(stderr, "%s\n", nl_geterror());
            goto errout;
      }
      if (nfnl_log_pf_bind(nfnlh, family) < 0) {
            fprintf(stderr, "%s\n", nl_geterror());
            goto errout;
      }

      group = nl_str2af(argv[2]);
      if (nfnl_log_bind(nfnlh, group) < 0) {
            fprintf(stderr, "%s\n", nl_geterror());
            goto errout;
      }

      if (nfnl_log_set_mode(nfnlh, 0, NFULNL_COPY_PACKET, 0xffff) < 0) {
            fprintf(stderr, "%s\n", nl_geterror());
            goto errout;
      }

      rtnlh = nltool_alloc_handle();
      if (rtnlh == NULL) {
            goto errout_close;
      }

      if (nl_connect(rtnlh, NETLINK_ROUTE) < 0) {
            fprintf(stderr, "%s\n", nl_geterror());
            goto errout;
      }

      if ((link_cache = rtnl_link_alloc_cache(rtnlh)) == NULL) {
            fprintf(stderr, "%s\n", nl_geterror());
            goto errout_close;
      }

      nl_cache_mngt_provide(link_cache);

      while (1) {
            fd_set rfds;
            int nffd, rtfd, maxfd, retval;

            FD_ZERO(&rfds);

            maxfd = nffd = nl_socket_get_fd(nfnlh);
            FD_SET(nffd, &rfds);

            rtfd = nl_socket_get_fd(rtnlh);
            FD_SET(rtfd, &rfds);
            if (maxfd < rtfd)
                  maxfd = rtfd;

            /* wait for an incoming message on the netlink socket */
            retval = select(maxfd+1, &rfds, NULL, NULL, NULL);

            if (retval) {
                  if (FD_ISSET(nffd, &rfds))
                        nl_recvmsgs_default(nfnlh);
                  if (FD_ISSET(rtfd, &rfds))
                        nl_recvmsgs_default(rtnlh);
            }
      }

      nl_close(rtnlh);
errout_close:
      nl_close(nfnlh);
errout:
      return err;
}

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