193 lines
4.9 KiB
C
193 lines
4.9 KiB
C
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/* $NetBSD: unfdpass.c,v 1.1 1998/01/07 03:53:02 thorpej Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Test passing of file descriptors over Unix domain sockets.
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/un.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int sock[2];
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int main __P((int, char *[]));
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void child __P((void));
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struct cmessage {
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struct cmsghdr cm;
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int files[2];
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};
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/* ARGSUSED */
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct msghdr msg;
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int fd, i, status;
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char fname[16], buf[64];
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pid_t pid;
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struct cmsghdr *cmp;
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struct cmessage cm;
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/*
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* Create the test files.
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*/
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for (i = 0; i < 2; i++) {
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(void) sprintf(fname, "file%d", i + 1);
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if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) == -1)
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err(1, "open %s", fname);
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(void) sprintf(buf, "This is file %d.\n", i + 1);
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if (write(fd, buf, strlen(buf)) != strlen(buf))
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err(1, "write %s", fname);
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(void) close(fd);
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}
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/*
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* Create the socket pair to pass the descriptors over.
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*/
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if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sock) == -1)
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err(1, "socketpair");
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pid = fork();
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switch (pid) {
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case -1:
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err(1, "fork");
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/* NOTREACHED */
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case 0:
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child();
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/* NOTREACHED */
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}
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(void) close(sock[1]);
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/*
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* Open the files again, and pass them to the child over the socket.
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*/
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for (i = 0; i < 2; i++) {
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(void) sprintf(fname, "file%d", i + 1);
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if ((fd = open(fname, O_RDONLY, 0666)) == -1)
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err(1, "open %s", fname);
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cm.files[i] = fd;
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}
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(void) memset(&msg, 0, sizeof(msg));
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msg.msg_control = (caddr_t) &cm;
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msg.msg_controllen = sizeof(cm);
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cmp = CMSG_FIRSTHDR(&msg);
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cmp->cmsg_len = sizeof(cm);
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cmp->cmsg_level = SOL_SOCKET;
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cmp->cmsg_type = SCM_RIGHTS;
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if (sendmsg(sock[0], &msg, 0)) {
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warn("sendmsg");
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(void) kill(pid, SIGINT);
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}
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/* Wait for the child to exit. */
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if (waitpid(pid, &status, 0) == -1)
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err(1, "waitpid");
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if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
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errx(1, "child exited with status of %d\n",
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WEXITSTATUS(status));
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exit(0);
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}
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void
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child()
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{
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struct msghdr msg;
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char buf[64];
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struct cmsghdr *cmp;
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struct cmessage cm;
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int i;
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/*
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* Close the socket we're not using.
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*/
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(void) close(sock[0]);
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/*
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* Grab the descriptors passed to us.
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*/
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(void) memset(&msg, 0, sizeof(msg));
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msg.msg_control = (caddr_t) &cm;
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msg.msg_controllen = sizeof(cm);
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if (recvmsg(sock[1], &msg, 0) < 0)
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err(1, "recvmsg");
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cmp = CMSG_FIRSTHDR(&msg);
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if (cmp->cmsg_len != sizeof(cm))
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err(1, "bad control message length");
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if (cmp->cmsg_level != SOL_SOCKET)
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err(1, "bad control message level");
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if (cmp->cmsg_type != SCM_RIGHTS)
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err(1, "bad control message type");
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/*
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* Read the files and print their contents.
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*/
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for (i = 0; i < 2; i++) {
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(void) memset(buf, 0, sizeof(buf));
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if (read(cm.files[i], buf, sizeof(buf)) <= 0)
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err(1, "read file %d", i + 1);
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printf("%s", buf);
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}
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/*
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* All done!
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*/
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exit(0);
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}
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