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#include <includes.h>
/*
* send_fd() and recv_fd() come from OpenSSH-23/openssh/monitor_fdpass.c.
* These two functions have been written by Niels Provos :
*
* 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.
*/
int send_fd(int socket, int fd)
{
#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
struct msghdr msg;
struct iovec vec;
char ch = '\0';
int n;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
char tmp[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
#endif
memset(&msg, 0, sizeof(msg));
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
msg.msg_accrights = (caddr_t)&fd;
msg.msg_accrightslen = sizeof(fd);
#else
msg.msg_control = (caddr_t)tmp;
msg.msg_controllen = CMSG_LEN(sizeof(int));
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;
#endif
vec.iov_base = &ch;
vec.iov_len = 1;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
if ((n = sendmsg(socket, &msg, 0)) == -1)
fprintf(stderr, "send_fd(): sendmsg(%d): %s", fd,
strerror(errno));
if (n != 1)
fprintf(stderr, "send_fd(): sendmsg: expected sent 1 got %d", n);
return 0;
#else
return -1;
#endif
}
int
recv_fd(int socket)
{
#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
struct msghdr msg;
struct iovec vec;
char ch;
int fd, n;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
char tmp[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
#endif
memset(&msg, 0, sizeof(msg));
vec.iov_base = &ch;
vec.iov_len = 1;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
msg.msg_accrights = (caddr_t)&fd;
msg.msg_accrightslen = sizeof(fd);
#else
msg.msg_control = tmp;
msg.msg_controllen = sizeof(tmp);
#endif
if ((n = recvmsg(socket, &msg, 0)) == -1)
printf("%s: recvmsg: %s", __func__, strerror(errno));
if (n != 1)
printf("%s: recvmsg: expected received 1 got %d",
__func__, n);
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
if (msg.msg_accrightslen != sizeof(fd))
printf("recv_fd(): no fd\n");
#else
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg->cmsg_type != SCM_RIGHTS)
printf("recv_fd(): expected type %d got %d",
SCM_RIGHTS, cmsg->cmsg_type);
fd = (*(int *)CMSG_DATA(cmsg));
#endif
return fd;
#else
return -1;
#endif
}
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