/***
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*
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* tools/rtping.c
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* sends real-time ICMP echo requests
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*
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* rtnet - real-time networking subsystem
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* Copyright (C) 2004 Jan Kiszka <jan.kiszka@web.de>
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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 <fcntl.h>
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#include <signal.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ipv4_chrdev.h>
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int f;
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struct ipv4_cmd cmd;
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struct in_addr addr;
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unsigned int count = 0;
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int delay = 1000;
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unsigned int sent = 0;
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unsigned int received = 0;
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float wc_rtt = 0;
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void help(void)
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{
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fprintf(stderr, "Usage:\n"
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"\trtping [-c count] [-i interval] [-s packetsize] <addr>\n"
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);
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exit(1);
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}
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int getintopt(int argc, int pos, char *argv[], int min)
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{
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int result;
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if (pos >= argc)
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help();
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if ((sscanf(argv[pos], "%u", &result) != 1) || (result < min)) {
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fprintf(stderr, "invalid parameter: %s %s\n", argv[pos-1], argv[pos]);
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exit(1);
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}
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return result;
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}
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void print_statistics()
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{
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printf("\n--- %s rtping statistics ---\n"
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"%d packets transmitted, %d received, %d%% packet loss\n"
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"worst case rtt = %.1f us\n",
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inet_ntoa(addr), sent, received, 100 - ((received * 100) / sent),
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wc_rtt);
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exit(0);
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}
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void terminate(int signal)
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{
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print_statistics();
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}
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void ping(int signal)
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{
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int ret;
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struct in_addr from;
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float rtt;
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cmd.args.ping.ip_addr = addr.s_addr;
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sent++;
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ret = ioctl(f, IOC_RT_PING, &cmd);
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if (ret < 0) {
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if (errno == ETIME)
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goto done;
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perror("ioctl");
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exit(1);
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}
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received++;
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from.s_addr = cmd.args.ping.ip_addr;
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rtt = (float)cmd.args.ping.rtt / (float)1000;
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if (rtt > wc_rtt)
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wc_rtt = rtt;
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printf("%d bytes from %s: icmp_seq=%d time=%.1f us\n",
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ret, inet_ntoa(from), cmd.args.ping.sequence, rtt);
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done:
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cmd.args.ping.sequence++;
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if (count > 0 && sent == count)
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print_statistics();
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}
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int main(int argc, char *argv[])
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{
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const char rtnet_dev[] = "/dev/rtnet";
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struct timeval time;
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struct itimerval timer = {{0, 0}, {0, 1}};
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int i;
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if (argc < 2)
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help();
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gettimeofday(&time, NULL);
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cmd.args.ping.id = time.tv_usec & 0xFFFF;
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cmd.args.ping.sequence = 1;
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cmd.args.ping.msg_size = 56;
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cmd.args.ping.timeout = 500;
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for (i = 1; i < argc-1; i++) {
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if (strcmp(argv[i], "-c") == 0)
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count = getintopt(argc, ++i, argv, 1);
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else if (strcmp(argv[i], "-i") == 0)
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delay = getintopt(argc, ++i, argv, 1);
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else if (strcmp(argv[i], "-s") == 0) {
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cmd.args.ping.msg_size = getintopt(argc, ++i, argv, 0);
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if (cmd.args.ping.msg_size > 1472)
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cmd.args.ping.msg_size = 1472;
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} else
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help();
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}
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if (!inet_aton(argv[i], &addr))
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help();
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f = open(rtnet_dev, O_RDWR);
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if (f < 0) {
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perror(rtnet_dev);
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exit(1);
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}
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printf("Real-time PING %s %u(%u) bytes of data.\n",
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inet_ntoa(addr), cmd.args.ping.msg_size,
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cmd.args.ping.msg_size + 28);
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signal(SIGINT, terminate);
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signal(SIGALRM, ping);
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timer.it_interval.tv_sec = delay / 1000;
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timer.it_interval.tv_usec = (delay % 1000) * 1000;
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setitimer(ITIMER_REAL, &timer, NULL);
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while (1) pause();
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}
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