139 lines
4.0 KiB
C
139 lines
4.0 KiB
C
/*
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* Copyright (c) 2014 Spectra Logic Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* Authors: Alan Somers (Spectra Logic Corporation)
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*
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* $FreeBSD$
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*/
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* Sends a single UDP packet to the provided address, with SO_DONTROUTE set
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* I couldn't find a way to do this with builtin utilities like nc(1)
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*/
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int
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main(int argc, char **argv)
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{
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struct sockaddr_storage dst;
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int s, t;
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int opt;
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int ret;
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ssize_t len;
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const char* sendbuf = "Hello, World!";
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const size_t buflen = 80;
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char recvbuf[buflen];
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bool v6 = false;
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const char *addr, *tapdev;
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const uint16_t port = 46120;
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bzero(&dst, sizeof(dst));
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if (argc < 3 || argc > 4) {
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fprintf(stderr, "Usage: %s [-6] ip_address tapdev\n", argv[0]);
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exit(2);
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}
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if (strcmp("-6", argv[1]) == 0) {
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v6 = true;
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addr = argv[2];
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tapdev = argv[3];
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} else {
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addr = argv[1];
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tapdev = argv[2];
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}
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t = open(tapdev, O_RDWR | O_NONBLOCK);
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if (t < 0)
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err(EXIT_FAILURE, "open");
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if (v6)
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s = socket(PF_INET6, SOCK_DGRAM, 0);
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else
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s = socket(PF_INET, SOCK_DGRAM, 0);
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if (s < 0)
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err(EXIT_FAILURE, "socket");
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opt = 1;
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ret = setsockopt(s, SOL_SOCKET, SO_DONTROUTE, &opt, sizeof(opt));
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if (ret == -1)
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err(EXIT_FAILURE, "setsockopt(SO_DONTROUTE)");
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if (v6) {
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struct sockaddr_in6 *dst6 = ((struct sockaddr_in6*)&dst);
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dst.ss_len = sizeof(struct sockaddr_in6);
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dst.ss_family = AF_INET6;
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dst6->sin6_port = htons(port);
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ret = inet_pton(AF_INET6, addr, &dst6->sin6_addr);
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} else {
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struct sockaddr_in *dst4 = ((struct sockaddr_in*)&dst);
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dst.ss_len = sizeof(struct sockaddr_in);
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dst.ss_family = AF_INET;
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dst4->sin_port = htons(port);
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ret = inet_pton(AF_INET, addr, &dst4->sin_addr);
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}
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if (ret != 1)
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err(EXIT_FAILURE, "inet_pton returned %d", ret);
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ret = sendto(s, sendbuf, strlen(sendbuf), 0, (struct sockaddr*)&dst,
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dst.ss_len);
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if (ret == -1)
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err(EXIT_FAILURE, "sendto");
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/* Verify that the packet went to the desired tap device */
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len = read(t, recvbuf, buflen);
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if (len == 0)
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errx(EXIT_FAILURE, "read returned EOF");
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else if (len < 0 && errno == EAGAIN)
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errx(EXIT_FAILURE, "Did not receive any packets");
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else if (len < 0)
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err(EXIT_FAILURE, "read");
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/*
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* If read returned anything at all, consider it a success. The packet
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* should be an Ethernet frame containing an ARP request for
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* ip_address. We won't bother to decode it
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*/
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return (0);
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}
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