150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
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* src/nf-queue.c Monitor netfilter queue 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) 2007, 2008 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2010 Karl Hiramoto <karl@hiramoto.org>
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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 <netinet/in.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nfnetlink_queue.h>
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#include <netlink/netfilter/nfnl.h>
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#include <netlink/netfilter/queue.h>
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#include <netlink/netfilter/queue_msg.h>
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static struct nl_sock *nf_sock;
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static struct nfnl_queue *alloc_queue(void)
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{
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struct nfnl_queue *queue;
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queue = nfnl_queue_alloc();
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if (!queue)
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nl_cli_fatal(ENOMEM, "Unable to allocate queue object");
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return queue;
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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 nfnl_queue_msg *msg = (struct nfnl_queue_msg *) obj;
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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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nfnl_queue_msg_set_verdict(msg, NF_ACCEPT);
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nl_object_dump(obj, &dp);
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nfnl_queue_msg_send_verdict(nf_sock, msg);
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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 *rt_sock;
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struct nl_cache *link_cache;
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struct nfnl_queue *queue;
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enum nfnl_queue_copy_mode copy_mode;
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uint32_t copy_range;
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int err = 1;
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int family;
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nf_sock = nfnl_queue_socket_alloc();
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if (nf_sock == NULL)
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nl_cli_fatal(ENOBUFS, "Unable to allocate netlink 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-queue family group [ copy_mode ] "
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"[ copy_range ]\n");
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printf("family: [ inet | inet6 | ... ] \n");
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printf("group: the --queue-num arg that you gave to iptables\n");
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printf("copy_mode: [ none | meta | packet ] \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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if ((family = nl_str2af(argv[1])) == AF_UNSPEC)
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nl_cli_fatal(NLE_INVAL, "Unknown family \"%s\"", argv[1]);
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nfnl_queue_pf_unbind(nf_sock, family);
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if ((err = nfnl_queue_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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queue = alloc_queue();
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nfnl_queue_set_group(queue, atoi(argv[2]));
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copy_mode = NFNL_QUEUE_COPY_PACKET;
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if (argc > 3) {
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copy_mode = nfnl_queue_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_queue_set_copy_mode(queue, 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_queue_set_copy_range(queue, copy_range);
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if ((err = nfnl_queue_create(nf_sock, queue)) < 0)
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nl_cli_fatal(err, "Unable to bind queue: %s", nl_geterror(err));
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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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link_cache = nl_cli_link_alloc_cache(rt_sock);
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nl_socket_set_buffer_size(nf_sock, 1024*127, 1024*127);
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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 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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