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udpzerobyte.c
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Editing: udpzerobyte.c
/*- * Copyright (c) 2008 Robert N. M. Watson * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include <sys/param.h> #include <sys/socket.h> #include <sys/un.h> #include <netinet/in.h> #include <arpa/inet.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <string.h> #include <unistd.h> /* * The UDP code allows transmitting zero-byte datagrams, but are they * received? */ #define THEPORT 9543 /* Arbitrary. */ static void usage(void) { errx(-1, "no arguments allowed\n"); } static void test(int domain, const char *domainstr, struct sockaddr *sa, socklen_t salen) { int sock_send, sock_receive; ssize_t size; sock_send = socket(domain, SOCK_DGRAM, 0); if (sock_send < 0) err(-1, "socket(%s, SOCK_DGRAM, 0)", domainstr); sock_receive = socket(domain, SOCK_DGRAM, 0); if (sock_receive < 0) err(-1, "socket(%s, SOCK_DGRAM, 0)", domainstr); if (bind(sock_receive, sa, salen) < 0) err(-1, "Protocol %s bind(sock_receive)", domainstr); if (fcntl(sock_receive, F_SETFL, O_NONBLOCK, 1) < 0) err(-1, "Protocll %s fcntl(sock_receive, FL_SETFL, " "O_NONBLOCK)", domainstr); if (connect(sock_send, sa, salen) < 0) err(-1, "Protocol %s connect(sock_send)", domainstr); size = recv(sock_receive, NULL, 0, 0); if (size > 0) errx(-1, "Protocol %s recv(sock_receive, NULL, 0) before: %zd", domainstr, size); else if (size < 0) err(-1, "Protocol %s recv(sock_receive, NULL, 0) before", domainstr); size = send(sock_send, NULL, 0, 0); if (size < 0) err(-1, "Protocol %s send(sock_send, NULL, 0)", domainstr); (void)sleep(1); size = recv(sock_receive, NULL, 0, 0); if (size < 0) err(-1, "Protocol %s recv(sock_receive, NULL, 0) test", domainstr); size = recv(sock_receive, NULL, 0, 0); if (size > 0) errx(-1, "Protocol %s recv(sock_receive, NULL, 0) after: %zd", domainstr, size); else if (size < 0) err(-1, "Protocol %s recv(sock_receive, NULL, 0) after", domainstr); } int main(int argc, __unused char *argv[]) { struct sockaddr_un sun; struct sockaddr_in6 sin6; struct sockaddr_in sin; struct in6_addr loopback6addr = IN6ADDR_LOOPBACK_INIT; if (argc != 1) usage(); bzero(&sin, sizeof(sin)); sin.sin_len = sizeof(sin); sin.sin_family = AF_INET; sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); sin.sin_port = htons(THEPORT); test(PF_INET, "PF_INET", (struct sockaddr *)&sin, sizeof(sin)); bzero(&sin6, sizeof(sin6)); sin6.sin6_len = sizeof(sin6); sin6.sin6_family = AF_INET6; sin6.sin6_addr = loopback6addr; sin6.sin6_port = htons(THEPORT); test(PF_INET6, "PF_INET6", (struct sockaddr *)&sin6, sizeof(sin6)); bzero(&sun, sizeof(sun)); sun.sun_len = sizeof(sun); sun.sun_family = AF_LOCAL; strlcpy(sun.sun_path, "/tmp/udpzerosize-socket", sizeof(sun.sun_path)); if (unlink(sun.sun_path) < 0 && errno != ENOENT) err(-1, "unlink: %s", sun.sun_path); test(PF_LOCAL, "PF_LOCAL", (struct sockaddr *)&sun, sizeof(sun)); return (0); }
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