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Sweden-Number/scheduler/client.c

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/*
* Client part of the client/server communication
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include "config.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <signal.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
#include <sys/un.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stdarg.h>
#include "wine/port.h"
#include "thread.h"
#include "wine/server.h"
#include "winerror.h"
#include "options.h"
/* Some versions of glibc don't define this */
#ifndef SCM_RIGHTS
#define SCM_RIGHTS 1
#endif
#define CONFDIR "/.wine" /* directory for Wine config relative to $HOME */
#define SERVERDIR "/wineserver-" /* server socket directory (hostname appended) */
#define SOCKETNAME "socket" /* name of the socket file */
/* data structure used to pass an fd with sendmsg/recvmsg */
struct cmsg_fd
{
int len; /* sizeof structure */
int level; /* SOL_SOCKET */
int type; /* SCM_RIGHTS */
int fd; /* fd to pass */
};
static void *boot_thread_id;
static sigset_t block_set; /* signals to block during server calls */
static int fd_socket; /* socket to exchange file descriptors with the server */
/* die on a fatal error; use only during initialization */
static void fatal_error( const char *err, ... ) WINE_NORETURN;
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, ... ) WINE_NORETURN;
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_protocol_error
*/
void server_protocol_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wine client error:%p: ", NtCurrentTeb()->tid );
vfprintf( stderr, err, args );
va_end( args );
SYSDEPS_ExitThread(1);
}
/***********************************************************************
* server_protocol_perror
*/
void server_protocol_perror( const char *err )
{
fprintf( stderr, "wine client error:%p: ", NtCurrentTeb()->tid );
perror( err );
SYSDEPS_ExitThread(1);
}
/***********************************************************************
* __wine_server_exception_handler (NTDLL.@)
*/
DWORD __wine_server_exception_handler( PEXCEPTION_RECORD record, EXCEPTION_FRAME *frame,
CONTEXT *context, EXCEPTION_FRAME **pdispatcher )
{
struct __server_exception_frame *server_frame = (struct __server_exception_frame *)frame;
if ((record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
NtCurrentTeb()->buffer_pos = server_frame->buffer_pos;
return ExceptionContinueSearch;
}
/***********************************************************************
* wine_server_alloc_req (NTDLL.@)
*/
void wine_server_alloc_req( union generic_request *req, size_t size )
{
unsigned int pos = NtCurrentTeb()->buffer_pos;
assert( size <= REQUEST_MAX_VAR_SIZE );
if (pos + size > NtCurrentTeb()->buffer_size)
server_protocol_error( "buffer overflow %d bytes\n",
pos + size - NtCurrentTeb()->buffer_pos );
NtCurrentTeb()->buffer_pos = pos + size;
req->header.var_offset = pos;
req->header.var_size = size;
}
/***********************************************************************
* send_request
*
* Send a request to the server.
*/
static void send_request( union generic_request *request )
{
int ret;
if ((ret = write( NtCurrentTeb()->request_fd, request, sizeof(*request) )) == sizeof(*request))
return;
if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
if (errno == EPIPE) SYSDEPS_ExitThread(0);
server_protocol_perror( "sendmsg" );
}
/***********************************************************************
* wait_reply
*
* Wait for a reply from the server.
*/
static void wait_reply( union generic_request *req )
{
int ret;
for (;;)
{
if ((ret = read( NtCurrentTeb()->reply_fd, req, sizeof(*req) )) == sizeof(*req))
return;
if (!ret) break;
if (ret > 0) server_protocol_error( "partial read %d\n", ret );
if (errno == EINTR) continue;
if (errno == EPIPE) break;
server_protocol_perror("read");
}
/* the server closed the connection; time to die... */
SYSDEPS_ExitThread(0);
}
/***********************************************************************
* wine_server_call (NTDLL.@)
*
* Perform a server call.
*/
unsigned int wine_server_call( union generic_request *req, size_t size )
{
sigset_t old_set;
memset( (char *)req + size, 0, sizeof(*req) - size );
sigprocmask( SIG_BLOCK, &block_set, &old_set );
send_request( req );
wait_reply( req );
sigprocmask( SIG_SETMASK, &old_set, NULL );
return req->header.error;
}
/***********************************************************************
* wine_server_send_fd
*
* Send a file descriptor to the server.
*/
void wine_server_send_fd( int fd )
{
#ifndef HAVE_MSGHDR_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_MSGHDR_ACCRIGHTS
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_MSGHDR_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_MSGHDR_ACCRIGHTS */
data.tid = (void *)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) SYSDEPS_ExitThread(0);
server_protocol_perror( "sendmsg" );
}
}
/***********************************************************************
* receive_fd
*
* Receive a file descriptor passed from the server.
*/
static int receive_fd( handle_t *handle )
{
struct iovec vec;
int ret, fd;
#ifdef HAVE_MSGHDR_ACCRIGHTS
struct msghdr msghdr;
fd = -1;
msghdr.msg_accrights = (void *)&fd;
msghdr.msg_accrightslen = sizeof(fd);
#else /* HAVE_MSGHDR_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_MSGHDR_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_MSGHDR_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... */
SYSDEPS_ExitThread(0);
}
/***********************************************************************
* wine_server_recv_fd
*
* Receive a file descriptor passed from the server.
* The file descriptor must not be closed.
* Return -2 if a race condition stole our file descriptor.
*/
int wine_server_recv_fd( handle_t handle )
{
handle_t fd_handle;
int fd = receive_fd( &fd_handle );
/* now store it in the server fd cache for this handle */
SERVER_START_REQ( set_handle_info )
{
req->handle = fd_handle;
req->flags = 0;
req->mask = 0;
req->fd = fd;
if (!SERVER_CALL())
{
if (req->cur_fd != fd)
{
/* someone was here before us */
close( fd );
fd = req->cur_fd;
}
}
else
{
close( fd );
fd = -1;
}
}
SERVER_END_REQ;
if (handle != fd_handle) fd = -2; /* not the one we expected */
return fd;
}
/***********************************************************************
* get_config_dir
*
* Return the configuration directory ($WINEPREFIX or $HOME/.wine)
*/
const char *get_config_dir(void)
{
static char *confdir;
if (!confdir)
{
const char *prefix = getenv( "WINEPREFIX" );
if (prefix)
{
int len = strlen(prefix);
if (!(confdir = strdup( prefix ))) fatal_error( "out of memory\n" );
if (len > 1 && confdir[len-1] == '/') confdir[len-1] = 0;
}
else
{
const char *home = getenv( "HOME" );
if (!home)
{
struct passwd *pwd = getpwuid( getuid() );
if (!pwd) fatal_error( "could not find your home directory\n" );
home = pwd->pw_dir;
}
if (!(confdir = malloc( strlen(home) + strlen(CONFDIR) + 1 )))
fatal_error( "out of memory\n" );
strcpy( confdir, home );
strcat( confdir, CONFDIR );
}
}
return confdir;
}
/***********************************************************************
* start_server
*
* Start a new wine server.
*/
static void start_server( const char *oldcwd )
{
static int started; /* we only try once */
char *path, *p;
if (!started)
{
int status;
int pid = fork();
if (pid == -1) fatal_perror( "fork" );
if (!pid)
{
/* 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;
}
execl( p, "wineserver", NULL );
fatal_perror( "could not exec the server '%s'\n"
" specified in the WINESERVER environment variable", p );
}
/* first try the installation dir */
execl( BINDIR "/wineserver", "wineserver", NULL );
/* now try the dir we were launched from */
if (full_argv0)
{
if (!(path = malloc( strlen(full_argv0) + 20 )))
fatal_error( "out of memory\n" );
if ((p = strrchr( strcpy( path, full_argv0 ), '/' )))
{
strcpy( p, "/wineserver" );
execl( path, "wineserver", NULL );
strcpy( p, "/server/wineserver" );
execl( path, "wineserver", NULL );
}
free(path);
}
/* now try the path */
execlp( "wineserver", "wineserver", NULL );
/* and finally the current dir */
if (!(path = malloc( strlen(oldcwd) + 20 )))
fatal_error( "out of memory\n" );
p = strcpy( path, oldcwd ) + strlen( oldcwd );
strcpy( p, "/wineserver" );
execl( path, "wineserver", NULL );
strcpy( p, "/server/wineserver" );
execl( path, "wineserver", NULL );
free(path);
fatal_error( "could not exec wineserver\n" );
}
started = 1;
waitpid( pid, &status, 0 );
status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
if (status) exit(status); /* server failed */
}
}
/***********************************************************************
* 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 < 3; retry++)
{
/* if not the first try, wait a bit to leave the server time to exit */
if (retry) usleep( 100000 * retry * retry );
/* check for an existing socket */
if (lstat( SOCKETNAME, &st ) == -1)
{
if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
start_server( oldcwd );
if (lstat( SOCKETNAME, &st ) == -1) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
}
/* 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_SOCKADDR_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 );
}
fatal_error( "file '%s/%s' exists,\n"
" but I cannot connect to it; maybe the wineserver has crashed?\n"
" If this is the case, you should remove this socket file and try again.\n",
serverdir, SOCKETNAME );
}
/***********************************************************************
* CLIENT_InitServer
*
* Start the server and create the initial socket pair.
*/
void CLIENT_InitServer(void)
{
int size;
char hostname[64];
char *oldcwd, *serverdir;
const char *configdir;
handle_t dummy_handle;
/* 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;
}
/* if argv[0] is a relative path, make it absolute */
full_argv0 = argv0;
if (oldcwd && argv0[0] != '/' && strchr( argv0, '/' ))
{
char *new_argv0 = malloc( strlen(oldcwd) + strlen(argv0) + 2 );
if (new_argv0)
{
strcpy( new_argv0, oldcwd );
strcat( new_argv0, "/" );
strcat( new_argv0, argv0 );
full_argv0 = new_argv0;
}
}
/* get the server directory name */
if (gethostname( hostname, sizeof(hostname) ) == -1) fatal_perror( "gethostname" );
configdir = get_config_dir();
serverdir = malloc( strlen(configdir) + strlen(SERVERDIR) + strlen(hostname) + 1 );
if (!serverdir) fatal_error( "out of memory\n" );
strcpy( serverdir, configdir );
strcat( serverdir, SERVERDIR );
strcat( serverdir, hostname );
/* connect to the server */
fd_socket = server_connect( oldcwd, serverdir );
/* 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 );
/* receive the first thread request fd on the main socket */
NtCurrentTeb()->request_fd = receive_fd( &dummy_handle );
CLIENT_InitThread();
}
/***********************************************************************
* set_request_buffer
*/
inline static void set_request_buffer(void)
{
char *name;
int fd, ret;
unsigned int offset, size;
/* create a temporary file */
do
{
if (!(name = tmpnam(NULL))) server_protocol_perror( "tmpnam" );
fd = open( name, O_CREAT | O_EXCL | O_RDWR, 0600 );
} while ((fd == -1) && (errno == EEXIST));
if (fd == -1) server_protocol_perror( "create" );
unlink( name );
wine_server_send_fd( fd );
SERVER_START_REQ( set_thread_buffer )
{
req->fd = fd;
ret = SERVER_CALL();
offset = req->offset;
size = req->size;
}
SERVER_END_REQ;
if (ret) server_protocol_error( "set_thread_buffer failed with status %x\n", ret );
if ((NtCurrentTeb()->buffer = mmap( 0, size, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, offset )) == (void*)-1)
server_protocol_perror( "mmap" );
close( fd );
NtCurrentTeb()->buffer_pos = 0;
NtCurrentTeb()->buffer_size = size;
}
/***********************************************************************
* CLIENT_InitThread
*
* Send an init thread request. Return 0 if OK.
*/
void CLIENT_InitThread(void)
{
TEB *teb = NtCurrentTeb();
int version, ret;
int reply_pipe[2];
/* ignore SIGPIPE so that we get a EPIPE error instead */
signal( SIGPIPE, SIG_IGN );
/* 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];
/* 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 = getpid();
req->teb = teb;
req->entry = teb->entry_point;
req->reply_fd = reply_pipe[1];
req->wait_fd = teb->wait_fd[1];
ret = SERVER_CALL();
teb->pid = req->pid;
teb->tid = req->tid;
version = req->version;
if (req->boot) boot_thread_id = teb->tid;
else if (boot_thread_id == teb->tid) boot_thread_id = 0;
close( reply_pipe[1] );
}
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" );
set_request_buffer();
}
/***********************************************************************
* CLIENT_BootDone
*
* Signal that we have finished booting, and set debug level.
*/
void CLIENT_BootDone( int debug_level )
{
SERVER_START_REQ( boot_done )
{
req->debug_level = debug_level;
SERVER_CALL();
}
SERVER_END_REQ;
}
/***********************************************************************
* CLIENT_IsBootThread
*
* Return TRUE if current thread is the boot thread.
*/
int CLIENT_IsBootThread(void)
{
return (GetCurrentThreadId() == (DWORD)boot_thread_id);
}
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