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/* $OpenBSD: monitor_fdpass.c,v 1.17 2016/02/29 20:22:36 jca Exp $ */
/*
* Copyright 2001 Niels Provos <provos@citi.umich.edu>
* 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 ``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 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.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <errno.h>
#include <string.h>
#include "log.h"
#include "monitor.h"
int
mm_send_fd(int socket, int fd)
{
struct msghdr msg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(int))];
} cmsgbuf;
char ch = '\0';
struct cmsghdr *cmsg;
struct iovec vec;
ssize_t n;
bzero(&msg, sizeof msg);
msg.msg_control = (caddr_t)&cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*(int *)CMSG_DATA(cmsg) = fd;
vec.iov_base = &ch;
vec.iov_len = 1;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
if ((n = sendmsg(socket, &msg, 0)) == -1) {
log_error("mm_send_fd: sendmsg(%d)", fd);
return -1;
}
if (n != 1) {
log_error("mm_send_fd: sendmsg: expected sent 1 got %zd", n);
return -1;
}
return 0;
}
int
mm_receive_fd(int socket)
{
struct msghdr msg;
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(int))];
} cmsgbuf;
char ch;
struct cmsghdr *cmsg;
struct iovec vec;
ssize_t n;
int fd;
bzero(&msg, sizeof msg);
vec.iov_base = &ch;
vec.iov_len = 1;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
msg.msg_control = &cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
if ((n = recvmsg(socket, &msg, 0)) == -1) {
log_error("mm_receive_fd: recvmsg");
return -1;
}
if (n != 1) {
log_error("mm_receive_fd: recvmsg: expected received 1 got %zd",
n);
return -1;
}
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg == NULL) {
log_error("mm_receive_fd: no message header");
return -1;
}
if (cmsg->cmsg_type != SCM_RIGHTS) {
log_error("mm_receive_fd: expected type %d got %d", SCM_RIGHTS,
cmsg->cmsg_type);
return -1;
}
fd = (*(int *)CMSG_DATA(cmsg));
return fd;
}
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