libptytty/src/fdpass.C

/*----------------------------------------------------------------------*
 * File:        fdpass.C
 *----------------------------------------------------------------------*
 *
 * All portions of code are copyright by their respective author/s.
 * Copyright (c) 2005-2006,2012 Marc Lehmann <schmorp@schmorp.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *----------------------------------------------------------------------*/

#if defined(__SVR4) && defined(__sun)
# define _XPG4_2 1
#endif

#include "config.h"

#include <cstddef> // needed by broken bsds for NULL used in sys/uio.h
#include <cstdlib>

#include <sys/types.h>
#include <sys/uio.h>
#include <sys/socket.h>

#include "libptytty.h"

// CMSG_SPACE & CMSG_LEN are rfc2292 extensions to unix
#ifndef CMSG_SPACE
# define CMSG_SPACE(len) (sizeof (cmsghdr) + len)
#endif

#ifndef CMSG_LEN
# define CMSG_LEN(len) (sizeof (cmsghdr) + len)
#endif

bool
ptytty::send_fd (int socket, int fd)
{
  void *buf = malloc (CMSG_SPACE (sizeof (int)));

  if (!buf)
    return 0;

  msghdr msg;
  iovec iov;
  cmsghdr *cmsg;
  char data = 0;

  iov.iov_base = &data;
  iov.iov_len  = 1;

  msg.msg_name       = 0;
  msg.msg_namelen    = 0;
  msg.msg_iov        = &iov;
  msg.msg_iovlen     = 1;
  msg.msg_control    = buf;
  msg.msg_controllen = CMSG_SPACE (sizeof (int));

  cmsg = CMSG_FIRSTHDR (&msg);
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type  = SCM_RIGHTS;
  cmsg->cmsg_len   = CMSG_LEN (sizeof (int));

  *(int *)CMSG_DATA (cmsg) = fd;

  ssize_t result = sendmsg (socket, &msg, 0);

  free (buf);

  return result >= 0;
}

int
ptytty::recv_fd (int socket)
{
  void *buf = malloc (CMSG_SPACE (sizeof (int)));

  if (!buf)
    return -1;

  msghdr msg;
  iovec iov;
  char data = 1;

  iov.iov_base = &data;
  iov.iov_len  = 1;

  msg.msg_name       = 0;
  msg.msg_namelen    = 0;
  msg.msg_iov        = &iov;
  msg.msg_iovlen     = 1;
  msg.msg_control    = buf;
  msg.msg_controllen = CMSG_SPACE (sizeof (int));

  int fd = -1;

  if (recvmsg (socket, &msg, 0) >  0
      && data                   == 0
      && msg.msg_controllen     >= CMSG_SPACE (sizeof (int)))
    {
      cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);

      if (cmsg->cmsg_level   == SOL_SOCKET
          && cmsg->cmsg_type == SCM_RIGHTS
          && cmsg->cmsg_len  >= CMSG_LEN (sizeof (int)))
        fd = *(int *)CMSG_DATA (cmsg);
    }

  free (buf);

  return fd;
}

Revision:	1.14
Committed:	Wed Jan 18 12:19:31 2012 UTC (14 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+1 -4 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.4	/----------------------------------------------------------------------
2	root	1.1	* File: fdpass.C
3			----------------------------------------------------------------------
4			*
5			* All portions of code are copyright by their respective author/s.
6	root	1.14	* Copyright (c) 2005-2006,2012 Marc Lehmann <schmorp@schmorp.de>
7	root	1.1	*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			----------------------------------------------------------------------/
22
23	root	1.13	#if defined(__SVR4) && defined(__sun)
24			# define _XPG4_2 1
25			#endif
26
27	sf-exg	1.11	#include "config.h"
28	root	1.1
29	root	1.7	#include <cstddef> // needed by broken bsds for NULL used in sys/uio.h
30	root	1.10	#include <cstdlib>
31	root	1.6
32	ayin	1.9	#include <sys/types.h>
33	root	1.2	#include <sys/uio.h>
34	root	1.1	#include <sys/socket.h>
35
36	root	1.3	#include "libptytty.h"
37	root	1.1
38	root	1.10	// CMSG_SPACE & CMSG_LEN are rfc2292 extensions to unix
39			#ifndef CMSG_SPACE
40			# define CMSG_SPACE(len) (sizeof (cmsghdr) + len)
41			#endif
42
43			#ifndef CMSG_LEN
44	root	1.1	# define CMSG_LEN(len) (sizeof (cmsghdr) + len)
45			#endif
46
47	root	1.5	bool
48	root	1.3	ptytty::send_fd (int socket, int fd)
49	root	1.1	{
50	root	1.10	void *buf = malloc (CMSG_SPACE (sizeof (int)));
51
52			if (!buf)
53			return 0;
54
55	root	1.1	msghdr msg;
56			iovec iov;
57	root	1.10	cmsghdr *cmsg;
58	root	1.1	char data = 0;
59
60			iov.iov_base = &data;
61			iov.iov_len = 1;
62
63			msg.msg_name = 0;
64			msg.msg_namelen = 0;
65			msg.msg_iov = &iov;
66			msg.msg_iovlen = 1;
67	root	1.10	msg.msg_control = buf;
68			msg.msg_controllen = CMSG_SPACE (sizeof (int));
69	root	1.1
70	root	1.10	cmsg = CMSG_FIRSTHDR (&msg);
71	root	1.1	cmsg->cmsg_level = SOL_SOCKET;
72			cmsg->cmsg_type = SCM_RIGHTS;
73			cmsg->cmsg_len = CMSG_LEN (sizeof (int));
74
75			(int )CMSG_DATA (cmsg) = fd;
76
77	root	1.10	ssize_t result = sendmsg (socket, &msg, 0);
78
79			free (buf);
80	root	1.1
81	root	1.10	return result >= 0;
82	root	1.1	}
83
84			int
85	root	1.3	ptytty::recv_fd (int socket)
86	root	1.1	{
87	root	1.10	void *buf = malloc (CMSG_SPACE (sizeof (int)));
88
89			if (!buf)
90			return -1;
91
92	root	1.1	msghdr msg;
93			iovec iov;
94			char data = 1;
95
96			iov.iov_base = &data;
97			iov.iov_len = 1;
98
99			msg.msg_name = 0;
100			msg.msg_namelen = 0;
101			msg.msg_iov = &iov;
102			msg.msg_iovlen = 1;
103			msg.msg_control = buf;
104	root	1.10	msg.msg_controllen = CMSG_SPACE (sizeof (int));
105	root	1.1
106	root	1.10	int fd = -1;
107
108			if (recvmsg (socket, &msg, 0) > 0
109			&& data == 0
110			&& msg.msg_controllen >= CMSG_SPACE (sizeof (int)))
111			{
112			cmsghdr *cmsg = CMSG_FIRSTHDR (&msg);
113	root	1.1
114	root	1.10	if (cmsg->cmsg_level == SOL_SOCKET
115			&& cmsg->cmsg_type == SCM_RIGHTS
116			&& cmsg->cmsg_len >= CMSG_LEN (sizeof (int)))
117			fd = (int )CMSG_DATA (cmsg);
118			}
119	root	1.1
120	root	1.10	free (buf);
121	root	1.1
122	root	1.10	return fd;
123	root	1.1	}
124