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Copy pathfdpass.c
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170 lines (156 loc) · 4.4 KB
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/*
* 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/param.h>
#include <sys/types.h>
#include <stdlib.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/socket.h>
#include <sys/uio.h>
#include <syslog.h>
#include <errno.h>
#include <err.h>
#include <string.h>
#include "fdpass.h"
int
send_fd(int socket, int fd, void *base, size_t len)
{
#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
struct msghdr msg;
struct iovec vec;
char ch = '\0';
ssize_t 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;
memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
#endif
if (base == NULL) {
vec.iov_base = &ch;
vec.iov_len = 1;
} else {
vec.iov_base = base;
vec.iov_len = len;
}
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
if ((n = sendmsg(socket, &msg, 0)) == -1) {
if (errno == EAGAIN)
return (-1);
syslog(LOG_ERR,"%s: sendmsg(%d): %s", __func__, fd, strerror(errno));
exit(EXIT_FAILURE);
}
if (n == 0)
{
syslog(LOG_ERR,"%s: sendmsg: expected setn >0 got %ld", __func__, (long)n);
exit(EXIT_FAILURE);
}
#else
syslog(LOG_ERR, "%s: subsystems not supported due to lack of fd passing",__func__);
exit(EXIT_FAILURE);
#endif
return (0);
}
int
receive_fd(int socket, void *base, socklen_t *len)
{
#if defined(HAVE_RECVMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
struct msghdr msg;
struct iovec vec;
ssize_t n;
char ch;
int fd;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
char tmp[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
#endif
memset(&msg, 0, sizeof(msg));
if (base == NULL) {
vec.iov_base = &ch;
vec.iov_len = 1;
} else {
vec.iov_base = base;
vec.iov_len = *len;
}
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
while ((n = recvmsg(socket, &msg, 0)) == -1) {
if (errno == EINTR)
continue;
if (errno == EAGAIN)
return (-1);
syslog(LOG_ERR,"%s: recvmsg: %s", __func__, strerror(errno));
exit(EXIT_FAILURE);
}
if (n == 0)
{
syslog(LOG_ERR,"%s: recvmsg: expected received >0 got %ld", __func__, (long)n);
exit(EXIT_FAILURE);
}
if (len != 0)
*len = n;
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
if (msg.msg_accrightslen != sizeof(fd))
{
syslog(LOG_ERR,"%s: no fd", __func__);
exit(EXIT_FAILURE);
}
#else
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg->cmsg_type != SCM_RIGHTS)
{
syslog(LOG_ERR,"%s: expected type %d got %d", __func__, SCM_RIGHTS, cmsg->cmsg_type);
exit(EXIT_FAILURE);
}
memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
#endif
return fd;
#else
{
syslog(LOG_ERR, "%s: subsystems not supported due to lack of fd pasing", __func__);
exit(EXIT_FAILURE);
}
#endif
}