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Sweden-Number/server/request.c

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/*
* Server-side request handling
*
* 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 <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#include <sys/uio.h>
#include <sys/un.h>
#include <unistd.h>
#include "winnt.h"
#include "winbase.h"
#include "wincon.h"
#include "thread.h"
#include "process.h"
#define WANT_REQUEST_HANDLERS
#include "request.h"
/* Some versions of glibc don't define this */
#ifndef SCM_RIGHTS
#define SCM_RIGHTS 1
#endif
/* path names for server master Unix socket */
#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 */
struct master_socket
{
struct object obj; /* object header */
};
static void master_socket_dump( struct object *obj, int verbose );
static void master_socket_poll_event( struct object *obj, int event );
static void master_socket_destroy( struct object *obj );
static const struct object_ops master_socket_ops =
{
sizeof(struct master_socket), /* size */
master_socket_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
NULL, /* get_poll_events */
master_socket_poll_event, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
NULL, /* queue_async */
master_socket_destroy /* destroy */
};
struct thread *current = NULL; /* thread handling the current request */
unsigned int global_error = 0; /* global error code for when no thread is current */
unsigned int server_start_ticks = 0; /* tick count offset from server startup */
static struct master_socket *master_socket; /* the master socket object */
/* socket communication static structures */
static struct iovec myiovec;
static struct msghdr msghdr;
#ifndef HAVE_MSGHDR_ACCRIGHTS
struct cmsg_fd
{
int len; /* sizeof structure */
int level; /* SOL_SOCKET */
int type; /* SCM_RIGHTS */
int fd; /* fd to pass */
};
static struct cmsg_fd cmsg = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, -1 };
#endif /* HAVE_MSGHDR_ACCRIGHTS */
/* complain about a protocol error and terminate the client connection */
void fatal_protocol_error( struct thread *thread, const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "Protocol error:%p: ", thread );
vfprintf( stderr, err, args );
va_end( args );
thread->exit_code = 1;
kill_thread( thread, 1 );
}
/* complain about a protocol error and terminate the client connection */
void fatal_protocol_perror( struct thread *thread, const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "Protocol error:%p: ", thread );
vfprintf( stderr, err, args );
perror( " " );
va_end( args );
thread->exit_code = 1;
kill_thread( thread, 1 );
}
/* die on a fatal error */
void fatal_error( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wineserver: " );
vfprintf( stderr, err, args );
va_end( args );
exit(1);
}
/* die on a fatal error */
void fatal_perror( const char *err, ... )
{
va_list args;
va_start( args, err );
fprintf( stderr, "wineserver: " );
vfprintf( stderr, err, args );
perror( " " );
va_end( args );
exit(1);
}
/* allocate the reply data */
void *set_reply_data_size( size_t size )
{
assert( size <= get_reply_max_size() );
if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
current->reply_size = size;
return current->reply_data;
}
/* write the remaining part of the reply */
void write_reply( struct thread *thread )
{
int ret;
if ((ret = write( thread->reply_fd,
(char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
thread->reply_towrite )) >= 0)
{
if (!(thread->reply_towrite -= ret))
{
free( thread->reply_data );
thread->reply_data = NULL;
/* sent everything, can go back to waiting for requests */
change_select_fd( &thread->obj, thread->request_fd, POLLIN );
}
return;
}
if (errno == EPIPE)
kill_thread( thread, 0 ); /* normal death */
else if (errno != EWOULDBLOCK && errno != EAGAIN)
fatal_protocol_perror( thread, "reply write" );
}
/* send a reply to the current thread */
static void send_reply( union generic_reply *reply )
{
int ret;
if (!current->reply_size)
{
if ((ret = write( current->reply_fd, reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
}
else
{
struct iovec vec[2];
vec[0].iov_base = (void *)reply;
vec[0].iov_len = sizeof(*reply);
vec[1].iov_base = current->reply_data;
vec[1].iov_len = current->reply_size;
if ((ret = writev( current->reply_fd, vec, 2 )) < sizeof(*reply)) goto error;
if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
{
/* couldn't write it all, wait for POLLOUT */
change_select_fd( &current->obj, current->reply_fd, POLLOUT );
return;
}
}
if (current->reply_data)
{
free( current->reply_data );
current->reply_data = NULL;
}
return;
error:
if (ret >= 0)
fatal_protocol_error( current, "partial write %d\n", ret );
else if (errno == EPIPE)
kill_thread( current, 0 ); /* normal death */
else
fatal_protocol_perror( current, "reply write" );
}
/* call a request handler */
static void call_req_handler( struct thread *thread )
{
union generic_reply reply;
enum request req = thread->req.request_header.req;
current = thread;
current->reply_size = 0;
clear_error();
memset( &reply, 0, sizeof(reply) );
if (debug_level) trace_request();
if (req < REQ_NB_REQUESTS)
{
req_handlers[req]( &current->req, &reply );
if (current)
{
reply.reply_header.error = current->error;
reply.reply_header.reply_size = current->reply_size;
if (debug_level) trace_reply( req, &reply );
send_reply( &reply );
}
current = NULL;
return;
}
fatal_protocol_error( current, "bad request %d\n", req );
}
/* read a request from a thread */
void read_request( struct thread *thread )
{
int ret;
if (!thread->req_toread) /* no pending request */
{
if ((ret = read( thread->obj.fd, &thread->req,
sizeof(thread->req) )) != sizeof(thread->req)) goto error;
if (!(thread->req_toread = thread->req.request_header.request_size))
{
/* no data, handle request at once */
call_req_handler( thread );
return;
}
if (!(thread->req_data = malloc( thread->req_toread )))
fatal_protocol_error( thread, "no memory for %d bytes request\n", thread->req_toread );
}
/* read the variable sized data */
for (;;)
{
ret = read( thread->obj.fd, ((char *)thread->req_data +
thread->req.request_header.request_size - thread->req_toread),
thread->req_toread );
if (ret <= 0) break;
if (!(thread->req_toread -= ret))
{
call_req_handler( thread );
free( thread->req_data );
thread->req_data = NULL;
return;
}
}
error:
if (!ret) /* closed pipe */
kill_thread( thread, 0 );
else if (ret > 0)
fatal_protocol_error( thread, "partial read %d\n", ret );
else if (errno != EWOULDBLOCK && errno != EAGAIN)
fatal_protocol_perror( thread, "read" );
}
/* receive a file descriptor on the process socket */
int receive_fd( struct process *process )
{
struct send_fd data;
int fd, ret;
#ifdef HAVE_MSGHDR_ACCRIGHTS
msghdr.msg_accrightslen = sizeof(int);
msghdr.msg_accrights = (void *)&fd;
#else /* HAVE_MSGHDR_ACCRIGHTS */
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
cmsg.fd = -1;
#endif /* HAVE_MSGHDR_ACCRIGHTS */
myiovec.iov_base = (void *)&data;
myiovec.iov_len = sizeof(data);
ret = recvmsg( process->obj.fd, &msghdr, 0 );
#ifndef HAVE_MSGHDR_ACCRIGHTS
fd = cmsg.fd;
#endif
if (ret == sizeof(data))
{
struct thread *thread;
if (data.tid) thread = get_thread_from_id( data.tid );
else thread = (struct thread *)grab_object( process->thread_list );
if (!thread || thread->process != process)
{
if (debug_level)
fprintf( stderr, "%08x: *fd* %d <- %d bad thread id\n",
(unsigned int)data.tid, data.fd, fd );
close( fd );
}
else
{
if (debug_level)
fprintf( stderr, "%08x: *fd* %d <- %d\n",
(unsigned int)thread, data.fd, fd );
thread_add_inflight_fd( thread, data.fd, fd );
}
if (thread) release_object( thread );
return 0;
}
if (ret >= 0)
{
if (ret > 0)
fprintf( stderr, "Protocol error: process %p: partial recvmsg %d for fd\n",
process, ret );
kill_process( process, NULL, 1 );
}
else
{
if (errno != EWOULDBLOCK && errno != EAGAIN)
{
fprintf( stderr, "Protocol error: process %p: ", process );
perror( "recvmsg" );
kill_process( process, NULL, 1 );
}
}
return -1;
}
/* send an fd to a client */
int send_client_fd( struct process *process, int fd, handle_t handle )
{
int ret;
if (debug_level)
fprintf( stderr, "%08x: *fd* %d -> %d\n", (unsigned int)current, handle, fd );
#ifdef HAVE_MSGHDR_ACCRIGHTS
msghdr.msg_accrightslen = sizeof(fd);
msghdr.msg_accrights = (void *)&fd;
#else /* HAVE_MSGHDR_ACCRIGHTS */
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
cmsg.fd = fd;
#endif /* HAVE_MSGHDR_ACCRIGHTS */
myiovec.iov_base = (void *)&handle;
myiovec.iov_len = sizeof(handle);
ret = sendmsg( process->obj.fd, &msghdr, 0 );
if (ret == sizeof(handle)) return 0;
if (ret >= 0)
{
if (ret > 0)
fprintf( stderr, "Protocol error: process %p: partial sendmsg %d\n", process, ret );
kill_process( process, NULL, 1 );
}
else
{
fprintf( stderr, "Protocol error: process %p: ", process );
perror( "sendmsg" );
kill_process( process, NULL, 1 );
}
return -1;
}
/* get current tick count to return to client */
unsigned int get_tick_count(void)
{
struct timeval t;
gettimeofday( &t, NULL );
return (t.tv_sec * 1000) + (t.tv_usec / 1000) - server_start_ticks;
}
static void master_socket_dump( struct object *obj, int verbose )
{
struct master_socket *sock = (struct master_socket *)obj;
assert( obj->ops == &master_socket_ops );
fprintf( stderr, "Master socket fd=%d\n", sock->obj.fd );
}
/* handle a socket event */
static void master_socket_poll_event( struct object *obj, int event )
{
struct master_socket *sock = (struct master_socket *)obj;
assert( obj->ops == &master_socket_ops );
assert( sock == master_socket ); /* there is only one master socket */
if (event & (POLLERR | POLLHUP))
{
/* this is not supposed to happen */
fprintf( stderr, "wineserver: Error on master socket\n" );
release_object( obj );
}
else if (event & POLLIN)
{
struct sockaddr_un dummy;
int len = sizeof(dummy);
int client = accept( master_socket->obj.fd, (struct sockaddr *) &dummy, &len );
if (client == -1) return;
fcntl( client, F_SETFL, O_NONBLOCK );
create_process( client );
}
}
/* remove the socket upon exit */
static void socket_cleanup(void)
{
static int do_it_once;
if (!do_it_once++) unlink( SOCKETNAME );
}
static void master_socket_destroy( struct object *obj )
{
socket_cleanup();
}
/* 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;
}
/* create the server directory and chdir to it */
static void create_server_dir(void)
{
char hostname[64];
char *serverdir;
const char *confdir = get_config_dir();
struct stat st;
if (gethostname( hostname, sizeof(hostname) ) == -1) fatal_perror( "gethostname" );
if (!(serverdir = malloc( strlen(SERVERDIR) + strlen(hostname) + 1 )))
fatal_error( "out of memory\n" );
if (chdir( confdir ) == -1) fatal_perror( "chdir %s", confdir );
strcpy( serverdir, SERVERDIR );
strcat( serverdir, hostname );
if (chdir( serverdir ) == -1)
{
if (errno != ENOENT) fatal_perror( "chdir %s", serverdir );
if (mkdir( serverdir, 0700 ) == -1) fatal_perror( "mkdir %s", serverdir );
if (chdir( serverdir ) == -1) fatal_perror( "chdir %s", serverdir );
}
if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
if (!S_ISDIR(st.st_mode)) fatal_error( "%s is not a directory\n", 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 );
}
/* open the master server socket and start waiting for new clients */
void open_master_socket(void)
{
struct sockaddr_un addr;
int fd, slen;
/* make sure no request is larger than the maximum size */
assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
create_server_dir();
if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
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 (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
{
if ((errno == EEXIST) || (errno == EADDRINUSE))
exit(0); /* pretend we succeeded to start */
else
fatal_perror( "bind" );
}
atexit( socket_cleanup );
chmod( SOCKETNAME, 0600 ); /* make sure no other user can connect */
if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
if (!(master_socket = alloc_object( &master_socket_ops, fd )))
fatal_error( "out of memory\n" );
set_select_events( &master_socket->obj, POLLIN );
/* setup msghdr structure constant fields */
msghdr.msg_name = NULL;
msghdr.msg_namelen = 0;
msghdr.msg_iov = &myiovec;
msghdr.msg_iovlen = 1;
/* init startup ticks */
server_start_ticks = get_tick_count();
/* go in the background */
switch(fork())
{
case -1:
fatal_perror( "fork" );
case 0:
setsid();
break;
default:
_exit(0); /* do not call atexit functions */
}
}
/* close the master socket and stop waiting for new clients */
void close_master_socket(void)
{
/* if a new client is waiting, we keep on running */
if (!check_select_events( master_socket->obj.fd, POLLIN ))
release_object( master_socket );
}
/* lock/unlock the master socket to stop accepting new clients */
void lock_master_socket( int locked )
{
set_select_events( &master_socket->obj, locked ? 0 : POLLIN );
}
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