/***
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*
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* demo/posix/cobalt/rtnet-eth_p_all.c
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*
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* ETH_P_ALL receiver - listens for all incoming packets and dumps them
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*
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* Copyright (C) 2006 Jan Kiszka <jan.kiszka@web.de>
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*
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* RTnet - real-time networking example
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <signal.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <netinet/ether.h>
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char buffer[10*1024];
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int sock;
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static void catch_signal(int sig)
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{
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close(sock);
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}
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int main(int argc, char *argv[])
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{
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struct sched_param param = { .sched_priority = 1 };
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ssize_t len;
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struct sockaddr_ll addr;
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struct ether_header *eth = (struct ether_header *)buffer;
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signal(SIGTERM, catch_signal);
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signal(SIGINT, catch_signal);
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signal(SIGHUP, catch_signal);
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mlockall(MCL_CURRENT|MCL_FUTURE);
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if ((sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
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perror("socket cannot be created");
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return EXIT_FAILURE;
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}
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if (argc > 1) {
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struct ifreq ifr;
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snprintf(ifr.ifr_name, IFNAMSIZ, "%s", argv[1]);
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if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
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perror("cannot get interface index");
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close(sock);
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return EXIT_FAILURE;
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}
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addr.sll_family = AF_PACKET;
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addr.sll_protocol = ETH_P_ALL;
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addr.sll_ifindex = ifr.ifr_ifindex;
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if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
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perror("cannot bind to local ip/port");
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close(sock);
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return EXIT_FAILURE;
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}
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}
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pthread_setschedparam(pthread_self(), SCHED_FIFO, ¶m);
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while (1) {
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len = recv(sock, buffer, sizeof(buffer), 0);
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if (len < 0)
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break;
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printf("from: %s type: %04x length=%zd\n",
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ether_ntoa((struct ether_addr *)eth->ether_shost),
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ntohs(eth->ether_type), len);
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}
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printf("shutting down\n");
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return EXIT_SUCCESS;
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}
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