114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/* $OpenBSD: monitor_fdpass.c,v 1.7 2016/02/29 20:22:36 jca Exp $ */
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/*
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* Copyright (c) 2002 Matthieu Herrb
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* Copyright (c) 2001 Niels Provos <provos@citi.umich.edu>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "monitor.h"
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void
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send_fd(int sock, int fd)
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{
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struct msghdr msg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(int))];
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} cmsgbuf;
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struct cmsghdr *cmsg;
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struct iovec vec;
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int result = 0;
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ssize_t n;
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memset(&msg, 0, sizeof(msg));
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if (fd >= 0) {
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msg.msg_control = (caddr_t)&cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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*(int *)CMSG_DATA(cmsg) = fd;
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} else
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result = errno;
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vec.iov_base = &result;
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vec.iov_len = sizeof(int);
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msg.msg_iov = &vec;
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msg.msg_iovlen = 1;
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if ((n = sendmsg(sock, &msg, 0)) == -1)
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syslog(LOG_WARNING, "send_fd: sendmsg(%d): %m", sock);
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if (n != sizeof(int))
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syslog(LOG_WARNING, "send_fd: sendmsg: expected sent 1 got %zd",
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n);
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}
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int
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recv_fd(int sock)
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{
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struct msghdr msg;
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union {
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struct cmsghdr hdr;
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char buf[CMSG_SPACE(sizeof(int))];
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} cmsgbuf;
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struct cmsghdr *cmsg;
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struct iovec vec;
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ssize_t n;
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int result;
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int fd;
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memset(&msg, 0, sizeof(msg));
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vec.iov_base = &result;
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vec.iov_len = sizeof(int);
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msg.msg_iov = &vec;
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msg.msg_iovlen = 1;
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msg.msg_control = &cmsgbuf.buf;
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msg.msg_controllen = sizeof(cmsgbuf.buf);
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if ((n = recvmsg(sock, &msg, 0)) == -1) {
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syslog(LOG_WARNING, "recv_fd: recvmsg(%d): %m", sock);
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return -1;
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}
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if (n != sizeof(int))
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syslog(LOG_WARNING,
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"recv_fd: recvmsg: expected received 1 got %zd", n);
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if (result == 0) {
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg == NULL) {
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syslog(LOG_WARNING, "recv_fd: no message header");
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return (-1);
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}
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if (cmsg->cmsg_type != SCM_RIGHTS)
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syslog(LOG_WARNING, "recv_fd: expected type %d got %d",
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SCM_RIGHTS, cmsg->cmsg_type);
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fd = (*(int *)CMSG_DATA(cmsg));
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return (fd);
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} else {
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errno = result;
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return (-1);
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}
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}
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