assuan-socket.c
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	/* assuan-socket.c
	Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.

	This file is part of Assuan.

	Assuan is free software; you can redistribute it and/or modify it
	under the terms of the GNU Lesser General Public License as
	published by the Free Software Foundation; either version 2.1 of
	the License, or (at your option) any later version.

	Assuan 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
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#include <stdio.h>
	#include <stdlib.h>
	#ifdef HAVE_W32_SYSTEM
	# define WIN32_LEAN_AND_MEAN
	# include <windows.h>
	# include <wincrypt.h>
	#ifndef HAVE_W32CE_SYSTEM
	# include <io.h>
	#endif
	#else
	# include <sys/types.h>
	# include <sys/socket.h>
	#endif
	#include <errno.h>
	#ifdef HAVE_SYS_STAT_H
	# include <sys/stat.h>
	#endif
	#ifdef HAVE_FCNTL_H
	#include <fcntl.h>
	#endif
	#include <assert.h>

	#include "assuan-defs.h"
	#include "debug.h"

	/* Hacks for Slowaris. */
	#ifndef PF_LOCAL
	# ifdef PF_UNIX
	# define PF_LOCAL PF_UNIX
	# else
	# define PF_LOCAL AF_UNIX
	# endif
	#endif
	#ifndef AF_LOCAL
	# define AF_LOCAL AF_UNIX
	#endif

	#ifdef HAVE_W32_SYSTEM
	#ifndef S_IRUSR
	# define S_IRUSR 0
	# define S_IWUSR 0
	#endif
	#ifndef S_IRGRP
	# define S_IRGRP 0
	# define S_IWGRP 0
	#endif
	#endif


	#ifdef HAVE_W32_SYSTEM

	#ifdef HAVE_W32CE_SYSTEM
	static wchar_t *
	utf8_to_wchar (const char *string)
	{
	int n;
	size_t nbytes;
	wchar_t *result;

	if (!string)
	return NULL;

	n = MultiByteToWideChar (CP_UTF8, 0, string, -1, NULL, 0);
	if (n < 0)
	return NULL;

	nbytes = (size_t)(n+1) * sizeof(*result);
	if (nbytes / sizeof(*result) != (n+1))
	{
	SetLastError (ERROR_INVALID_PARAMETER);
	return NULL;
	}
	result = malloc (nbytes);
	if (!result)
	return NULL;

	n = MultiByteToWideChar (CP_UTF8, 0, string, -1, result, n);
	if (n < 0)
	{
	n = GetLastError ();
	free (result);
	result = NULL;
	SetLastError (n);
	}
	return result;
	}

	static HANDLE
	MyCreateFile (LPCSTR lpFileName, DWORD dwDesiredAccess, DWORD dwSharedMode,
	LPSECURITY_ATTRIBUTES lpSecurityAttributes,
	DWORD dwCreationDisposition, DWORD dwFlagsAndAttributes,
	HANDLE hTemplateFile)
	{
	wchar_t *filename;
	HANDLE result;
	int err;

	filename = utf8_to_wchar (lpFileName);
	if (!filename)
	return INVALID_HANDLE_VALUE;

	result = CreateFileW (filename, dwDesiredAccess, dwSharedMode,
	lpSecurityAttributes, dwCreationDisposition,
	dwFlagsAndAttributes, hTemplateFile);
	err = GetLastError ();
	free (filename);
	SetLastError (err);
	return result;
	}
	static int
	MyDeleteFile (LPCSTR lpFileName)
	{
	wchar_t *filename;
	int result, err;

	filename = utf8_to_wchar (lpFileName);
	if (!filename)
	return 0;

	result = DeleteFileW (filename);
	err = GetLastError ();
	free (filename);
	SetLastError (err);
	return result;
	}
	#else /!HAVE_W32CE_SYSTEM/
	#define MyCreateFile CreateFileA
	#define MyDeleteFile DeleteFileA
	#endif /!HAVE_W32CE_SYSTEM/

	int
	_assuan_sock_wsa2errno (int err)
	{
	switch (err)
	{
	case WSAENOTSOCK:
	return EINVAL;
	case WSAEWOULDBLOCK:
	return EAGAIN;
	case ERROR_BROKEN_PIPE:
	return EPIPE;
	case WSANOTINITIALISED:
	return ENOSYS;
	default:
	return EIO;
	}
	}


	/* W32: Fill BUFFER with LENGTH bytes of random. Returns -1 on
	failure, 0 on success. Sets errno on failure. */
	static int
	get_nonce (char *buffer, size_t nbytes)
	{
	HCRYPTPROV prov;
	int ret = -1;

	if (!CryptAcquireContext (&prov, NULL, NULL, PROV_RSA_FULL,
	(CRYPT_VERIFYCONTEXT\|CRYPT_SILENT)) )
	gpg_err_set_errno (ENODEV);
	else
	{
	if (!CryptGenRandom (prov, nbytes, (unsigned char *) buffer))
	gpg_err_set_errno (ENODEV);
	else
	ret = 0;
	CryptReleaseContext (prov, 0);
	}
	return ret;
	}


	/* W32: The buffer for NONCE needs to be at least 16 bytes. Returns 0 on
	success and sets errno on failure. */
	static int
	read_port_and_nonce (const char fname, unsigned short port, char *nonce)
	{
	FILE *fp;
	char buffer[50], *p;
	size_t nread;
	int aval;

	fp = fopen (fname, "rb");
	if (!fp)
	return -1;
	nread = fread (buffer, 1, sizeof buffer - 1, fp);
	fclose (fp);
	if (!nread)
	{
	gpg_err_set_errno (ENOENT);
	return -1;
	}
	buffer[nread] = 0;
	aval = atoi (buffer);
	if (aval < 1 \|\| aval > 65535)
	{
	gpg_err_set_errno (EINVAL);
	return -1;
	}
	*port = (unsigned int)aval;
	for (p=buffer; nread && *p != '\n'; p++, nread--)
	;
	if (*p != '\n' \|\| nread != 17)
	{
	gpg_err_set_errno (EINVAL);
	return -1;
	}
	p++; nread--;
	memcpy (nonce, p, 16);
	return 0;
	}
	#endif /HAVE_W32_SYSTEM/


	/* Return a new socket. Note that under W32 we consider a socket the
	same as an System Handle; all functions using such a handle know
	about this dual use and act accordingly. */
	assuan_fd_t
	_assuan_sock_new (assuan_context_t ctx, int domain, int type, int proto)
	{
	#ifdef HAVE_W32_SYSTEM
	assuan_fd_t res;
	if (domain == AF_UNIX \|\| domain == AF_LOCAL)
	domain = AF_INET;
	res = SOCKET2HANDLE(_assuan_socket (ctx, domain, type, proto));
	return res;
	#else
	return _assuan_socket (ctx, domain, type, proto);
	#endif
	}


	int
	_assuan_sock_connect (assuan_context_t ctx, assuan_fd_t sockfd,
	struct sockaddr *addr, int addrlen)
	{
	#ifdef HAVE_W32_SYSTEM
	if (addr->sa_family == AF_LOCAL \|\| addr->sa_family == AF_UNIX)
	{
	struct sockaddr_in myaddr;
	struct sockaddr_un *unaddr;
	unsigned short port;
	char nonce[16];
	int ret;

	unaddr = (struct sockaddr_un *)addr;
	if (read_port_and_nonce (unaddr->sun_path, &port, nonce))
	return -1;

	myaddr.sin_family = AF_INET;
	myaddr.sin_port = htons (port);
	myaddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);

	/* Set return values. */
	unaddr->sun_family = myaddr.sin_family;
	unaddr->sun_port = myaddr.sin_port;
	unaddr->sun_addr.s_addr = myaddr.sin_addr.s_addr;

	ret = _assuan_connect (ctx, HANDLE2SOCKET(sockfd),
	(struct sockaddr *)&myaddr, sizeof myaddr);
	if (!ret)
	{
	/* Send the nonce. */
	ret = _assuan_write (ctx, sockfd, nonce, 16);
	if (ret >= 0 && ret != 16)
	{
	gpg_err_set_errno (EIO);
	ret = -1;
	}
	}
	return ret;
	}
	else
	{
	int res;
	res = _assuan_connect (ctx, HANDLE2SOCKET (sockfd), addr, addrlen);
	return res;
	}
	#else
	return _assuan_connect (ctx, sockfd, addr, addrlen);
	#endif
	}


	int
	_assuan_sock_bind (assuan_context_t ctx, assuan_fd_t sockfd,
	struct sockaddr *addr, int addrlen)
	{
	#ifdef HAVE_W32_SYSTEM
	if (addr->sa_family == AF_LOCAL \|\| addr->sa_family == AF_UNIX)
	{
	struct sockaddr_in myaddr;
	struct sockaddr_un *unaddr;
	HANDLE filehd;
	int len = sizeof myaddr;
	int rc;
	char nonce[16];
	char tmpbuf[33+16];
	DWORD nwritten;

	if (get_nonce (nonce, 16))
	return -1;

	unaddr = (struct sockaddr_un *)addr;

	myaddr.sin_port = 0;
	myaddr.sin_family = AF_INET;
	myaddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);

	filehd = MyCreateFile (unaddr->sun_path,
	GENERIC_WRITE,
	FILE_SHARE_READ,
	NULL,
	CREATE_NEW,
	FILE_ATTRIBUTE_NORMAL,
	NULL);
	if (filehd == INVALID_HANDLE_VALUE)
	{
	if (GetLastError () == ERROR_FILE_EXISTS)
	gpg_err_set_errno (WSAEADDRINUSE);
	return -1;
	}

	rc = bind (HANDLE2SOCKET (sockfd), (struct sockaddr *)&myaddr, len);
	if (!rc)
	rc = getsockname (HANDLE2SOCKET (sockfd),
	(struct sockaddr *)&myaddr, &len);
	if (rc)
	{
	int save_e = errno;
	CloseHandle (filehd);
	MyDeleteFile (unaddr->sun_path);
	gpg_err_set_errno (save_e);
	return rc;
	}
	snprintf (tmpbuf, sizeof tmpbuf, "%d\n", ntohs (myaddr.sin_port));
	len = strlen (tmpbuf);
	memcpy (tmpbuf+len, nonce,16);
	len += 16;

	if (!WriteFile (filehd, tmpbuf, len, &nwritten, NULL))
	{
	CloseHandle (filehd);
	MyDeleteFile (unaddr->sun_path);
	gpg_err_set_errno (EIO);
	return -1;
	}
	CloseHandle (filehd);
	return 0;
	}
	else
	{
	int res = bind (HANDLE2SOCKET(sockfd), addr, addrlen);
	if (res < 0)
	gpg_err_set_errno ( _assuan_sock_wsa2errno (WSAGetLastError ()));
	return res;
	}
	#else
	return bind (sockfd, addr, addrlen);
	#endif
	}


	int
	_assuan_sock_get_nonce (assuan_context_t ctx, struct sockaddr *addr,
	int addrlen, assuan_sock_nonce_t *nonce)
	{
	#ifdef HAVE_W32_SYSTEM
	if (addr->sa_family == AF_LOCAL \|\| addr->sa_family == AF_UNIX)
	{
	struct sockaddr_un *unaddr;
	unsigned short port;

	if (sizeof nonce->nonce != 16)
	{
	gpg_err_set_errno (EINVAL);
	return -1;
	}
	nonce->length = 16;
	unaddr = (struct sockaddr_un *)addr;
	if (read_port_and_nonce (unaddr->sun_path, &port, nonce->nonce))
	return -1;
	}
	else
	{
	nonce->length = 42; /* Arbitrary value to detect unitialized nonce. */
	nonce->nonce[0] = 42;
	}
	#else
	(void)addr;
	(void)addrlen;
	nonce->length = 0;
	#endif
	return 0;
	}


	int
	_assuan_sock_check_nonce (assuan_context_t ctx, assuan_fd_t fd,
	assuan_sock_nonce_t *nonce)
	{
	#ifdef HAVE_W32_SYSTEM
	char buffer[16], *p;
	size_t nleft;
	int n;

	if (sizeof nonce->nonce != 16)
	{
	gpg_err_set_errno (EINVAL);
	return -1;
	}

	if (nonce->length == 42 && nonce->nonce[0] == 42)
	return 0; /* Not a Unix domain socket. */

	if (nonce->length != 16)
	{
	gpg_err_set_errno (EINVAL);
	return -1;
	}

	p = buffer;
	nleft = 16;
	while (nleft)
	{
	n = _assuan_read (ctx, SOCKET2HANDLE(fd), p, nleft);
	if (n < 0 && errno == EINTR)
	;
	else if (n < 0 && errno == EAGAIN)
	Sleep (100);
	else if (n < 0)
	return -1;
	else if (!n)
	{
	gpg_err_set_errno (EIO);
	return -1;
	}
	else
	{
	p += n;
	nleft -= n;
	}
	}
	if (memcmp (buffer, nonce->nonce, 16))
	{
	gpg_err_set_errno (EACCES);
	return -1;
	}
	#else
	(void)fd;
	(void)nonce;
	#endif
	return 0;
	}


	/* Public API. */

	/* In the future, we can allow access to sock_ctx, if that context's
	hook functions need to be overridden. There can only be one global
	assuan_sock_* user (one library or one application) with this
	convenience interface, if non-standard hook functions are
	needed. */
	static assuan_context_t sock_ctx;

	gpg_error_t
	assuan_sock_init ()
	{
	gpg_error_t err;
	#ifdef HAVE_W32_SYSTEM
	WSADATA wsadat;
	#endif

	if (sock_ctx != NULL)
	return 0;

	err = assuan_new (&sock_ctx);

	#ifdef HAVE_W32_SYSTEM
	if (! err)
	WSAStartup (0x202, &wsadat);
	#endif

	return err;
	}


	void
	assuan_sock_deinit ()
	{
	if (sock_ctx == NULL)
	return;

	#ifdef HAVE_W32_SYSTEM
	WSACleanup ();
	#endif

	assuan_release (sock_ctx);
	sock_ctx = NULL;
	}


	int
	assuan_sock_close (assuan_fd_t fd)
	{
	return _assuan_close (sock_ctx, fd);
	}

	assuan_fd_t
	assuan_sock_new (int domain, int type, int proto)
	{
	return _assuan_sock_new (sock_ctx, domain, type, proto);
	}

	int
	assuan_sock_connect (assuan_fd_t sockfd, struct sockaddr *addr, int addrlen)
	{
	return _assuan_sock_connect (sock_ctx, sockfd, addr, addrlen);
	}

	int
	assuan_sock_bind (assuan_fd_t sockfd, struct sockaddr *addr, int addrlen)
	{
	return _assuan_sock_bind (sock_ctx, sockfd, addr, addrlen);
	}

	int
	assuan_sock_get_nonce (struct sockaddr *addr, int addrlen,
	assuan_sock_nonce_t *nonce)
	{
	return _assuan_sock_get_nonce (sock_ctx, addr, addrlen, nonce);
	}

	int
	assuan_sock_check_nonce (assuan_fd_t fd, assuan_sock_nonce_t *nonce)
	{
	return _assuan_sock_check_nonce (sock_ctx, fd, nonce);
	}

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