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/*
* Wine server communication
*
* Copyright (C) 1998 Alexandre Julliard
*
* This library 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.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "ntstatus.h"
#include "thread.h"
#include "wine/library.h"
#include "wine/pthread.h"
#include "wine/server.h"
#include "wine/debug.h"
#include "winerror.h"
#include "ntdll_misc.h"
WINE_DEFAULT_DEBUG_CHANNEL(server);
/* Some versions of glibc don't define this */
#ifndef SCM_RIGHTS
#define SCM_RIGHTS 1
#endif
#define SOCKETNAME "socket" /* name of the socket file */
#define LOCKNAME "lock" /* name of the lock file */
#ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
/* data structure used to pass an fd with sendmsg/recvmsg */
struct cmsg_fd
{
int len; /* size of structure */
int level; /* SOL_SOCKET */
int type; /* SCM_RIGHTS */
int fd; /* fd to pass */
};
#endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
static sigset_t block_set; /* signals to block during server calls */
static int fd_socket = -1; /* socket to exchange file descriptors with the server */
#ifdef __GNUC__
static void fatal_error( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
static void fatal_perror( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
static void server_connect_error( const char *serverdir ) __attribute__((noreturn));
#endif
/* die on a fatal error; use only during initialization */
static void fatal_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine: " );
vfprintf( stderr, err, args );
va_end( args );
exit(1);
}
/* die on a fatal error; use only during initialization */
static void fatal_perror( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine: " );
vfprintf( stderr, err, args );
perror( " " );
va_end( args );
exit(1);
}
/***********************************************************************
* server_abort_thread
*/
void server_abort_thread( int status )
{
sigprocmask( SIG_BLOCK, &block_set, NULL );
close( NtCurrentTeb()->wait_fd[0] );
close( NtCurrentTeb()->wait_fd[1] );
close( NtCurrentTeb()->reply_fd );
close( NtCurrentTeb()->request_fd );
wine_pthread_abort_thread( status );
}
/***********************************************************************
* server_protocol_error
*/
void server_protocol_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine client error:%lx: ", GetCurrentThreadId() );
vfprintf( stderr, err, args );
va_end( args );
server_abort_thread(1);
}
/***********************************************************************
* server_protocol_perror
*/
void server_protocol_perror( const char *err )
{
fprintf( stderr, "wine client error:%lx: ", GetCurrentThreadId() );
perror( err );
server_abort_thread(1);
}
/***********************************************************************
* send_request
*
* Send a request to the server.
*/
static void send_request( const struct __server_request_info *req )
{
int i, ret;
if (!req->u.req.request_header.request_size)
{
if ((ret = write( NtCurrentTeb()->request_fd, &req->u.req,
sizeof(req->u.req) )) == sizeof(req->u.req)) return;
}
else
{
struct iovec vec[__SERVER_MAX_DATA+1];
vec[0].iov_base = (void *)&req->u.req;
vec[0].iov_len = sizeof(req->u.req);
for (i = 0; i < req->data_count; i++)
{
vec[i+1].iov_base = (void *)req->data[i].ptr;
vec[i+1].iov_len = req->data[i].size;
}
if ((ret = writev( NtCurrentTeb()->request_fd, vec, i+1 )) ==
req->u.req.request_header.request_size + sizeof(req->u.req)) return;
}
if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
if (errno == EPIPE) server_abort_thread(0);
server_protocol_perror( "write" );
}
/***********************************************************************
* read_reply_data
*
* Read data from the reply buffer; helper for wait_reply.
*/
static void read_reply_data( void *buffer, size_t size )
{
int ret;
for (;;)
{
if ((ret = read( NtCurrentTeb()->reply_fd, buffer, size )) > 0)
{
if (!(size -= ret)) return;
buffer = (char *)buffer + ret;
continue;
}
if (!ret) break;
if (errno == EINTR) continue;
if (errno == EPIPE) break;
server_protocol_perror("read");
}
/* the server closed the connection; time to die... */
server_abort_thread(0);
}
/***********************************************************************
* wait_reply
*
* Wait for a reply from the server.
*/
inline static void wait_reply( struct __server_request_info *req )
{
read_reply_data( &req->u.reply, sizeof(req->u.reply) );
if (req->u.reply.reply_header.reply_size)
read_reply_data( req->reply_data, req->u.reply.reply_header.reply_size );
}
/***********************************************************************
* wine_server_call (NTDLL.@)
*
* Perform a server call.
*/
unsigned int wine_server_call( void *req_ptr )
{
struct __server_request_info * const req = req_ptr;
sigset_t old_set;
sigprocmask( SIG_BLOCK, &block_set, &old_set );
send_request( req );
wait_reply( req );
sigprocmask( SIG_SETMASK, &old_set, NULL );
return req->u.reply.reply_header.error;
}
/***********************************************************************
* wine_server_send_fd
*
* Send a file descriptor to the server.
*/
void wine_server_send_fd( int fd )
{
#ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
struct cmsg_fd cmsg;
#endif
struct send_fd data;
struct msghdr msghdr;
struct iovec vec;
int ret;
vec.iov_base = (void *)&data;
vec.iov_len = sizeof(data);
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
#ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
cmsg.len = sizeof(cmsg);
cmsg.level = SOL_SOCKET;
cmsg.type = SCM_RIGHTS;
cmsg.fd = fd;
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
msghdr.msg_flags = 0;
#endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
data.tid = GetCurrentThreadId();
data.fd = fd;
for (;;)
{
if ((ret = sendmsg( fd_socket, &msghdr, 0 )) == sizeof(data)) return;
if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
if (errno == EINTR) continue;
if (errno == EPIPE) server_abort_thread(0);
server_protocol_perror( "sendmsg" );
}
}
/***********************************************************************
* receive_fd
*
* Receive a file descriptor passed from the server.
*/
static int receive_fd( obj_handle_t *handle )
{
struct iovec vec;
int ret, fd;
#ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
struct msghdr msghdr;
fd = -1;
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
struct msghdr msghdr;
struct cmsg_fd cmsg;
cmsg.len = sizeof(cmsg);
cmsg.level = SOL_SOCKET;
cmsg.type = SCM_RIGHTS;
cmsg.fd = -1;
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
msghdr.msg_flags = 0;
#endif /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &vec;
msghdr.msg_iovlen = 1;
vec.iov_base = (void *)handle;
vec.iov_len = sizeof(*handle);
for (;;)
{
if ((ret = recvmsg( fd_socket, &msghdr, 0 )) > 0)
{
#ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
fd = cmsg.fd;
#endif
if (fd == -1) server_protocol_error( "no fd received for handle %d\n", *handle );
fcntl( fd, F_SETFD, 1 ); /* set close on exec flag */
return fd;
}
if (!ret) break;
if (errno == EINTR) continue;
if (errno == EPIPE) break;
server_protocol_perror("recvmsg");
}
/* the server closed the connection; time to die... */
server_abort_thread(0);
}
/***********************************************************************
* store_cached_fd
*
* Store the cached fd value for a given handle back into the server.
* Returns the new fd, which can be different if there was already an
* fd in the cache for that handle.
*/
inline static int store_cached_fd( int *fd, obj_handle_t handle )
{
int ret;
SERVER_START_REQ( set_handle_info )
{
req->handle = handle;
req->flags = 0;
req->mask = 0;
req->fd = *fd;
if (!(ret = wine_server_call( req )))
{
if (reply->cur_fd != *fd)
{
/* someone was here before us */
close( *fd );
*fd = reply->cur_fd;
}
}
else
{
close( *fd );
*fd = -1;
}
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* wine_server_fd_to_handle (NTDLL.@)
*
* Allocate a file handle for a Unix fd.
*/
int wine_server_fd_to_handle( int fd, unsigned int access, int inherit, obj_handle_t *handle )
{
int ret;
*handle = 0;
wine_server_send_fd( fd );
SERVER_START_REQ( alloc_file_handle )
{
req->access = access;
req->inherit = inherit;
req->fd = fd;
if (!(ret = wine_server_call( req ))) *handle = reply->handle;
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* wine_server_handle_to_fd (NTDLL.@)
*
* Retrieve the Unix fd corresponding to a file handle.
*/
int wine_server_handle_to_fd( obj_handle_t handle, unsigned int access, int *unix_fd,
enum fd_type *type, int *flags )
{
obj_handle_t fd_handle;
int ret, fd = -1;
*unix_fd = -1;
for (;;)
{
SERVER_START_REQ( get_handle_fd )
{
req->handle = handle;
req->access = access;
if (!(ret = wine_server_call( req ))) fd = reply->fd;
if (type) *type = reply->type;
if (flags) *flags = reply->flags;
}
SERVER_END_REQ;
if (ret) return ret;
if (fd != -1) break;
/* it wasn't in the cache, get it from the server */
fd = receive_fd( &fd_handle );
/* and store it back into the cache */
ret = store_cached_fd( &fd, fd_handle );
if (ret) return ret;
if (fd_handle == handle) break;
/* if we received a different handle this means there was
* a race with another thread; we restart everything from
* scratch in this case.
*/
}
if ((fd != -1) && ((fd = dup(fd)) == -1)) return STATUS_TOO_MANY_OPENED_FILES;
*unix_fd = fd;
return STATUS_SUCCESS;
}
/***********************************************************************
* wine_server_release_fd (NTDLL.@)
*
* Release the Unix fd returned by wine_server_handle_to_fd.
*/
void wine_server_release_fd( obj_handle_t handle, int unix_fd )
{
close( unix_fd );
}
/***********************************************************************
* start_server
*
* Start a new wine server.
*/
static void start_server( const char *oldcwd )
{
static int started; /* we only try once */
char *path, *p;
char *argv[3];
if (!started)
{
int status;
int pid = fork();
if (pid == -1) fatal_perror( "fork" );
if (!pid)
{
argv[0] = "wineserver";
argv[1] = TRACE_ON(server) ? "-d" : NULL;
argv[2] = NULL;
/* if server is explicitly specified, use this */
if ((p = getenv("WINESERVER")))
{
if (p[0] != '/' && oldcwd[0] == '/') /* make it an absolute path */
{
if (!(path = malloc( strlen(oldcwd) + strlen(p) + 1 )))
fatal_error( "out of memory\n" );
sprintf( path, "%s/%s", oldcwd, p );
p = path;
}
wine_exec_wine_binary( p, argv, NULL, FALSE );
fatal_perror( "could not exec the server '%s'\n"
" specified in the WINESERVER environment variable", p );
}
/* now use the standard search strategy */
wine_exec_wine_binary( argv[0], argv, NULL, FALSE );
fatal_error( "could not exec wineserver\n" );
}
waitpid( pid, &status, 0 );
status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
if (status == 2) return; /* server lock held by someone else, will retry later */
if (status) exit(status); /* server failed */
started = 1;
}
}
/***********************************************************************
* server_connect_error
*
* Try to display a meaningful explanation of why we couldn't connect
* to the server.
*/
static void server_connect_error( const char *serverdir )
{
int fd;
struct flock fl;
if ((fd = open( LOCKNAME, O_WRONLY )) == -1)
fatal_error( "for some mysterious reason, the wine server never started.\n" );
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0;
fl.l_len = 1;
if (fcntl( fd, F_GETLK, &fl ) != -1)
{
if (fl.l_type == F_WRLCK) /* the file is locked */
fatal_error( "a wine server seems to be running, but I cannot connect to it.\n"
" You probably need to kill that process (it might be pid %d).\n",
(int)fl.l_pid );
fatal_error( "for some mysterious reason, the wine server failed to run.\n" );
}
fatal_error( "the file system of '%s' doesn't support locks,\n"
" and there is a 'socket' file in that directory that prevents wine from starting.\n"
" You should make sure no wine server is running, remove that file and try again.\n",
serverdir );
}
/***********************************************************************
* server_connect
*
* Attempt to connect to an existing server socket.
* We need to be in the server directory already.
*/
static int server_connect( const char *oldcwd, const char *serverdir )
{
struct sockaddr_un addr;
struct stat st;
int s, slen, retry;
/* chdir to the server directory */
if (chdir( serverdir ) == -1)
{
if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
start_server( "." );
if (chdir( serverdir ) == -1) fatal_perror( "chdir to %s", serverdir );
}
/* make sure we are at the right place */
if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
if (st.st_uid != getuid()) fatal_error( "'%s' is not owned by you\n", serverdir );
if (st.st_mode & 077) fatal_error( "'%s' must not be accessible by other users\n", serverdir );
for (retry = 0; retry < 6; retry++)
{
/* if not the first try, wait a bit to leave the previous server time to exit */
if (retry)
{
usleep( 100000 * retry * retry );
start_server( oldcwd );
if (lstat( SOCKETNAME, &st ) == -1) continue; /* still no socket, wait a bit more */
}
else if (lstat( SOCKETNAME, &st ) == -1) /* check for an already existing socket */
{
if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
start_server( oldcwd );
if (lstat( SOCKETNAME, &st ) == -1) continue; /* still no socket, wait a bit more */
}
/* make sure the socket is sane (ISFIFO needed for Solaris) */
if (!S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode))
fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
if (st.st_uid != getuid())
fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
/* try to connect to it */
addr.sun_family = AF_UNIX;
strcpy( addr.sun_path, SOCKETNAME );
slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
#ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
addr.sun_len = slen;
#endif
if ((s = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
if (connect( s, (struct sockaddr *)&addr, slen ) != -1)
{
fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
return s;
}
close( s );
}
server_connect_error( serverdir );
}
/***********************************************************************
* rm_rf
*
* Remove a directory and all its contents; helper for create_config_dir.
*/
static void rm_rf( const char *path )
{
int err = errno; /* preserve errno */
DIR *dir;
char *buffer, *p;
struct stat st;
struct dirent *de;
if (!(buffer = malloc( strlen(path) + 256 + 1 ))) goto done;
strcpy( buffer, path );
p = buffer + strlen(buffer);
*p++ = '/';
if ((dir = opendir( path )))
{
while ((de = readdir( dir )))
{
if (!strcmp( de->d_name, "." ) || !strcmp( de->d_name, ".." )) continue;
strcpy( p, de->d_name );
if (unlink( buffer ) != -1) continue;
if (errno == EISDIR ||
(errno == EPERM && !lstat( buffer, &st ) && S_ISDIR(st.st_mode)))
{
/* recurse in the sub-directory */
rm_rf( buffer );
}
}
closedir( dir );
}
free( buffer );
rmdir( path );
done:
errno = err;
}
/***********************************************************************
* create_config_dir
*
* Create the wine configuration dir (~/.wine).
*/
static void create_config_dir(void)
{
const char *config_dir = wine_get_config_dir();
char *tmp_dir;
int fd;
pid_t pid, wret;
if (!(tmp_dir = malloc( strlen(config_dir) + sizeof("-XXXXXX") )))
fatal_error( "out of memory\n" );
strcpy( tmp_dir, config_dir );
strcat( tmp_dir, "-XXXXXX" );
if ((fd = mkstemps( tmp_dir, 0 )) == -1)
fatal_perror( "can't get temp file name for %s", config_dir );
close( fd );
unlink( tmp_dir );
if (mkdir( tmp_dir, 0777 ) == -1)
fatal_perror( "cannot create temp dir %s", tmp_dir );
MESSAGE( "wine: creating configuration directory '%s'...\n", config_dir );
pid = fork();
if (pid == -1)
{
rmdir( tmp_dir );
fatal_perror( "fork" );
}
if (!pid)
{
const char *argv[5];
argv[0] = "wineprefixcreate";
argv[1] = "--quiet";
argv[2] = "--prefix";
argv[3] = tmp_dir;
argv[4] = NULL;
wine_exec_wine_binary( argv[0], (char **)argv, NULL, FALSE );
rmdir( tmp_dir );
fatal_perror( "could not exec wineprefixcreate" );
}
else
{
int status;
while ((wret = waitpid( pid, &status, 0 )) != pid)
{
if (wret == -1 && errno != EINTR) fatal_perror( "wait4" );
}
if (!WIFEXITED(status) || WEXITSTATUS(status))
{
rm_rf( tmp_dir );
fatal_error( "wineprefixcreate failed while creating '%s'.\n", config_dir );
}
}
if (rename( tmp_dir, config_dir ) == -1)
{
rm_rf( tmp_dir );
if (errno != EEXIST && errno != ENOTEMPTY)
fatal_perror( "rename '%s' to '%s'", tmp_dir, config_dir );
/* else it was probably created by a concurrent wine process */
}
free( tmp_dir );
MESSAGE( "wine: '%s' created successfully.\n", config_dir );
}
/***********************************************************************
* server_init_process
*
* Start the server and create the initial socket pair.
*/
void server_init_process(void)
{
int size;
char *oldcwd;
obj_handle_t dummy_handle;
const char *server_dir = wine_get_server_dir();
if (!server_dir) /* this means the config dir doesn't exist */
{
create_config_dir();
server_dir = wine_get_server_dir();
}
/* retrieve the current directory */
for (size = 512; ; size *= 2)
{
if (!(oldcwd = malloc( size ))) break;
if (getcwd( oldcwd, size )) break;
free( oldcwd );
if (errno == ERANGE) continue;
oldcwd = NULL;
break;
}
/* connect to the server */
fd_socket = server_connect( oldcwd, server_dir );
/* switch back to the starting directory */
if (oldcwd)
{
chdir( oldcwd );
free( oldcwd );
}
/* setup the signal mask */
sigemptyset( &block_set );
sigaddset( &block_set, SIGALRM );
sigaddset( &block_set, SIGIO );
sigaddset( &block_set, SIGINT );
sigaddset( &block_set, SIGHUP );
sigaddset( &block_set, SIGUSR1 );
sigaddset( &block_set, SIGUSR2 );
/* receive the first thread request fd on the main socket */
NtCurrentTeb()->request_fd = receive_fd( &dummy_handle );
}
/***********************************************************************
* server_init_thread
*
* Send an init thread request. Return 0 if OK.
*/
void server_init_thread( int unix_pid, int unix_tid, void *entry_point )
{
TEB *teb = NtCurrentTeb();
int version, ret;
int reply_pipe[2];
struct sigaction sig_act;
sig_act.sa_handler = SIG_IGN;
sig_act.sa_flags = 0;
sigemptyset( &sig_act.sa_mask );
/* ignore SIGPIPE so that we get a EPIPE error instead */
sigaction( SIGPIPE, &sig_act, NULL );
/* automatic child reaping to avoid zombies */
#ifdef SA_NOCLDWAIT
sig_act.sa_flags |= SA_NOCLDWAIT;
#endif
sigaction( SIGCHLD, &sig_act, NULL );
/* create the server->client communication pipes */
if (pipe( reply_pipe ) == -1) server_protocol_perror( "pipe" );
if (pipe( teb->wait_fd ) == -1) server_protocol_perror( "pipe" );
wine_server_send_fd( reply_pipe[1] );
wine_server_send_fd( teb->wait_fd[1] );
teb->reply_fd = reply_pipe[0];
close( reply_pipe[1] );
/* set close on exec flag */
fcntl( teb->reply_fd, F_SETFD, 1 );
fcntl( teb->wait_fd[0], F_SETFD, 1 );
fcntl( teb->wait_fd[1], F_SETFD, 1 );
SERVER_START_REQ( init_thread )
{
req->unix_pid = unix_pid;
req->unix_tid = unix_tid;
req->teb = teb;
req->entry = entry_point;
req->reply_fd = reply_pipe[1];
req->wait_fd = teb->wait_fd[1];
ret = wine_server_call( req );
teb->ClientId.UniqueProcess = (HANDLE)reply->pid;
teb->ClientId.UniqueThread = (HANDLE)reply->tid;
version = reply->version;
}
SERVER_END_REQ;
if (ret) server_protocol_error( "init_thread failed with status %x\n", ret );
if (version != SERVER_PROTOCOL_VERSION)
server_protocol_error( "version mismatch %d/%d.\n"
"Your %s binary was not upgraded correctly,\n"
"or you have an older one somewhere in your PATH.\n"
"Or maybe the wrong wineserver is still running?\n",
version, SERVER_PROTOCOL_VERSION,
(version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
}
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