Sweden-Number/server/request.c

517 lines
14 KiB
C

/*
* Server-side request handling
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include "config.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"
#include "server.h"
#define WANT_REQUEST_HANDLERS
#include "request.h"
#include "wine/port.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 */
master_socket_destroy /* destroy */
};
struct request_socket
{
struct object obj; /* object header */
struct thread *thread; /* owning thread */
};
static void request_socket_dump( struct object *obj, int verbose );
static void request_socket_poll_event( struct object *obj, int event );
static const struct object_ops request_socket_ops =
{
sizeof(struct request_socket), /* size */
request_socket_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
NULL, /* get_poll_events */
request_socket_poll_event, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
no_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 */
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 );
}
/* 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);
}
/* call a request handler */
static inline void call_req_handler( struct thread *thread )
{
enum request req;
current = thread;
clear_error();
req = ((struct request_header *)current->buffer)->req;
if (debug_level) trace_request( req );
if (req < REQ_NB_REQUESTS)
{
req_handlers[req]( current->buffer );
if (current && !current->wait) send_reply( current );
current = NULL;
return;
}
fatal_protocol_error( current, "bad request %d\n", req );
}
/* send a reply to a thread */
void send_reply( struct thread *thread )
{
assert( !thread->wait );
if (debug_level) trace_reply( thread );
if (!write_request( thread )) set_select_events( &thread->obj, POLLOUT );
}
/* read a message from a client that has something to say */
void read_request( struct thread *thread )
{
int ret;
char dummy[1];
#ifdef HAVE_MSGHDR_ACCRIGHTS
msghdr.msg_accrightslen = sizeof(int);
msghdr.msg_accrights = (void *)&thread->pass_fd;
#else /* HAVE_MSGHDR_ACCRIGHTS */
msghdr.msg_control = &cmsg;
msghdr.msg_controllen = sizeof(cmsg);
cmsg.fd = -1;
#endif /* HAVE_MSGHDR_ACCRIGHTS */
assert( thread->pass_fd == -1 );
myiovec.iov_base = dummy;
myiovec.iov_len = 1;
ret = recvmsg( thread->obj.fd, &msghdr, 0 );
#ifndef HAVE_MSGHDR_ACCRIGHTS
thread->pass_fd = cmsg.fd;
#endif
if (ret > 0)
{
call_req_handler( thread );
thread->pass_fd = -1;
return;
}
if (!ret) /* closed pipe */
{
kill_thread( thread, 0 );
return;
}
perror("recvmsg");
thread->exit_code = 1;
kill_thread( thread, 1 );
}
/* send a message to a client that is ready to receive something */
int write_request( struct thread *thread )
{
int ret;
struct request_header *header = thread->buffer;
header->error = thread->error;
assert (thread->pass_fd == -1);
ret = write( thread->reply_fd, header, 1 );
if (ret > 0)
{
set_select_events( &thread->obj, POLLIN );
return 1;
}
if (errno == EWOULDBLOCK) return 0; /* not a fatal error */
if (errno == EPIPE)
{
kill_thread( thread, 0 ); /* normal death */
}
else
{
perror("sendmsg");
thread->exit_code = 1;
kill_thread( thread, 1 );
}
return -1;
}
/* send an fd to a client */
int send_client_fd( struct thread *thread, int fd, int handle )
{
int ret;
if (debug_level)
fprintf( stderr, "%08x: *fd* %d = %d\n", (unsigned int)thread, 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( thread->obj.fd, &msghdr, 0 );
if (ret > 0) return 0;
if (errno == EPIPE)
{
kill_thread( thread, 0 ); /* normal death */
}
else
{
perror("sendmsg");
thread->exit_code = 1;
kill_thread( thread, 1 );
}
return -1;
}
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) 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();
}
static void request_socket_dump( struct object *obj, int verbose )
{
struct request_socket *sock = (struct request_socket *)obj;
assert( obj->ops == &request_socket_ops );
fprintf( stderr, "Request socket fd=%d thread=%p\n", sock->obj.fd, sock->thread );
}
/* handle a request socket event */
static void request_socket_poll_event( struct object *obj, int event )
{
struct request_socket *sock = (struct request_socket *)obj;
assert( obj->ops == &request_socket_ops );
if (event & (POLLERR | POLLHUP)) kill_thread( sock->thread, 0 );
else if (event & POLLIN)
{
struct thread *thread = sock->thread;
int ret;
char dummy[1];
ret = read( sock->obj.fd, &dummy, 1 );
if (ret > 0)
{
call_req_handler( thread );
return;
}
if (!ret) /* closed pipe */
{
kill_thread( thread, 0 );
return;
}
perror("read");
thread->exit_code = 1;
kill_thread( thread, 1 );
}
}
/* create a request socket and send the fd to the client thread */
struct object *create_request_socket( struct thread *thread )
{
struct request_socket *sock;
int fd[2];
if (pipe( fd )) return NULL;
if (!(sock = alloc_object( &request_socket_ops, fd[0] )))
{
close( fd[1] );
return NULL;
}
sock->thread = thread;
send_client_fd( thread, fd[1], -1 );
close( fd[1] );
set_select_events( &sock->obj, POLLIN );
return &sock->obj;
}
/* 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 );
}
mkdir( confdir, 0755 ); /* just in case */
}
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(confdir) + strlen(SERVERDIR) + strlen(hostname) + 1 )))
fatal_error( "out of memory\n" );
strcpy( serverdir, confdir );
strcat( 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) );
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;
/* 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 );
}