427 lines
12 KiB
C
427 lines
12 KiB
C
/*
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* Server-side request handling
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*
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* Copyright (C) 1998 Alexandre Julliard
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*/
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#include "config.h"
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#endif
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "winnt.h"
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#include "winbase.h"
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#include "wincon.h"
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#include "thread.h"
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#include "process.h"
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#include "server.h"
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#define WANT_REQUEST_HANDLERS
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#include "request.h"
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#include "wine/port.h"
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/* Some versions of glibc don't define this */
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#ifndef SCM_RIGHTS
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#define SCM_RIGHTS 1
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#endif
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/* path names for server master Unix socket */
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#define CONFDIR "/.wine" /* directory for Wine config relative to $HOME */
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#define SERVERDIR "/wineserver-" /* server socket directory (hostname appended) */
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#define SOCKETNAME "socket" /* name of the socket file */
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struct master_socket
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{
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struct object obj; /* object header */
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};
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static void master_socket_dump( struct object *obj, int verbose );
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static void master_socket_poll_event( struct object *obj, int event );
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static void master_socket_destroy( struct object *obj );
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static const struct object_ops master_socket_ops =
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{
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sizeof(struct master_socket), /* size */
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master_socket_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satisfied */
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NULL, /* get_poll_events */
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master_socket_poll_event, /* poll_event */
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no_read_fd, /* get_read_fd */
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no_write_fd, /* get_write_fd */
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no_flush, /* flush */
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no_get_file_info, /* get_file_info */
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master_socket_destroy /* destroy */
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};
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struct thread *current = NULL; /* thread handling the current request */
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unsigned int global_error = 0; /* global error code for when no thread is current */
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static struct master_socket *master_socket; /* the master socket object */
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/* socket communication static structures */
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static struct iovec myiovec;
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static struct msghdr msghdr;
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#ifndef HAVE_MSGHDR_ACCRIGHTS
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struct cmsg_fd
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{
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int len; /* sizeof structure */
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int level; /* SOL_SOCKET */
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int type; /* SCM_RIGHTS */
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int fd; /* fd to pass */
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};
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static struct cmsg_fd cmsg = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, -1 };
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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/* complain about a protocol error and terminate the client connection */
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void fatal_protocol_error( struct thread *thread, const char *err, ... )
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{
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va_list args;
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va_start( args, err );
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fprintf( stderr, "Protocol error:%p: ", thread );
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vfprintf( stderr, err, args );
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va_end( args );
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thread->exit_code = 1;
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kill_thread( thread, 1 );
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}
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/* die on a fatal error */
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void fatal_error( const char *err, ... )
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{
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va_list args;
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va_start( args, err );
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fprintf( stderr, "wineserver: " );
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vfprintf( stderr, err, args );
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va_end( args );
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exit(1);
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}
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/* die on a fatal error */
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void fatal_perror( const char *err, ... )
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{
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va_list args;
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va_start( args, err );
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fprintf( stderr, "wineserver: " );
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vfprintf( stderr, err, args );
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perror( " " );
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va_end( args );
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exit(1);
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}
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/* call a request handler */
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static inline void call_req_handler( struct thread *thread )
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{
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enum request req;
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current = thread;
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clear_error();
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req = ((struct request_header *)current->buffer)->req;
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if (debug_level) trace_request( req );
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if (req < REQ_NB_REQUESTS)
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{
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req_handlers[req]( current->buffer );
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if (current && !current->wait) send_reply( current );
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current = NULL;
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return;
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}
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fatal_protocol_error( current, "bad request %d\n", req );
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}
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/* set the fd to pass to the thread */
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void set_reply_fd( struct thread *thread, int pass_fd )
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{
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assert( thread->pass_fd == -1 );
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thread->pass_fd = pass_fd;
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}
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/* send a reply to a thread */
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void send_reply( struct thread *thread )
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{
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assert( !thread->wait );
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if (debug_level) trace_reply( thread );
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if (!write_request( thread )) set_select_events( &thread->obj, POLLOUT );
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}
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/* read a message from a client that has something to say */
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void read_request( struct thread *thread )
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{
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int ret;
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char dummy[1];
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#ifdef HAVE_MSGHDR_ACCRIGHTS
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msghdr.msg_accrightslen = sizeof(int);
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msghdr.msg_accrights = (void *)&thread->pass_fd;
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#else /* HAVE_MSGHDR_ACCRIGHTS */
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msghdr.msg_control = &cmsg;
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msghdr.msg_controllen = sizeof(cmsg);
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cmsg.fd = -1;
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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assert( thread->pass_fd == -1 );
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myiovec.iov_base = dummy;
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myiovec.iov_len = 1;
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ret = recvmsg( thread->obj.fd, &msghdr, 0 );
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#ifndef HAVE_MSGHDR_ACCRIGHTS
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thread->pass_fd = cmsg.fd;
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#endif
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if (ret > 0)
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{
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call_req_handler( thread );
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thread->pass_fd = -1;
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return;
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}
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if (!ret) /* closed pipe */
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{
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kill_thread( thread, 0 );
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return;
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}
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perror("recvmsg");
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thread->exit_code = 1;
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kill_thread( thread, 1 );
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}
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/* send a message to a client that is ready to receive something */
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int write_request( struct thread *thread )
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{
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int ret;
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struct request_header *header = thread->buffer;
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header->error = thread->error;
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if (thread->pass_fd == -1)
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{
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/* write a single byte; the value is ignored anyway */
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ret = write( thread->obj.fd, header, 1 );
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}
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else /* we have an fd to send */
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{
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#ifdef HAVE_MSGHDR_ACCRIGHTS
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msghdr.msg_accrightslen = sizeof(int);
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msghdr.msg_accrights = (void *)&thread->pass_fd;
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#else /* HAVE_MSGHDR_ACCRIGHTS */
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msghdr.msg_control = &cmsg;
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msghdr.msg_controllen = sizeof(cmsg);
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cmsg.fd = thread->pass_fd;
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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myiovec.iov_base = (void *)header;
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myiovec.iov_len = 1;
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ret = sendmsg( thread->obj.fd, &msghdr, 0 );
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close( thread->pass_fd );
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thread->pass_fd = -1;
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}
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if (ret > 0)
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{
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set_select_events( &thread->obj, POLLIN );
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return 1;
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}
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if (errno == EWOULDBLOCK) return 0; /* not a fatal error */
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if (errno == EPIPE)
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{
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kill_thread( thread, 0 ); /* normal death */
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}
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else
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{
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perror("sendmsg");
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thread->exit_code = 1;
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kill_thread( thread, 1 );
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}
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return -1;
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}
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static void master_socket_dump( struct object *obj, int verbose )
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{
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struct master_socket *sock = (struct master_socket *)obj;
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assert( obj->ops == &master_socket_ops );
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fprintf( stderr, "Master socket fd=%d\n", sock->obj.fd );
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}
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/* handle a socket event */
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static void master_socket_poll_event( struct object *obj, int event )
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{
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struct master_socket *sock = (struct master_socket *)obj;
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assert( obj->ops == &master_socket_ops );
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assert( sock == master_socket ); /* there is only one master socket */
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if (event & (POLLERR | POLLHUP))
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{
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/* this is not supposed to happen */
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fprintf( stderr, "wineserver: Error on master socket\n" );
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release_object( obj );
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}
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else if (event & POLLIN)
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{
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struct sockaddr_un dummy;
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int len = sizeof(dummy);
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int client = accept( master_socket->obj.fd, (struct sockaddr *) &dummy, &len );
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if (client != -1) create_process( client );
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}
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}
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/* remove the socket upon exit */
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static void socket_cleanup(void)
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{
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static int do_it_once;
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if (!do_it_once++) unlink( SOCKETNAME );
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}
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static void master_socket_destroy( struct object *obj )
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{
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socket_cleanup();
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}
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/* return the configuration directory ($WINEPREFIX or $HOME/.wine) */
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const char *get_config_dir(void)
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{
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static char *confdir;
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if (!confdir)
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{
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const char *prefix = getenv( "WINEPREFIX" );
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if (prefix)
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{
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int len = strlen(prefix);
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if (!(confdir = strdup( prefix ))) fatal_error( "out of memory\n" );
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if (len > 1 && confdir[len-1] == '/') confdir[len-1] = 0;
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}
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else
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{
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const char *home = getenv( "HOME" );
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if (!home)
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{
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struct passwd *pwd = getpwuid( getuid() );
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if (!pwd) fatal_error( "could not find your home directory\n" );
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home = pwd->pw_dir;
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}
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if (!(confdir = malloc( strlen(home) + strlen(CONFDIR) + 1 )))
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fatal_error( "out of memory\n" );
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strcpy( confdir, home );
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strcat( confdir, CONFDIR );
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}
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mkdir( confdir, 0755 ); /* just in case */
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}
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return confdir;
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}
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/* create the server directory and chdir to it */
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static void create_server_dir(void)
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{
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char hostname[64];
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char *serverdir;
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const char *confdir = get_config_dir();
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struct stat st;
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if (gethostname( hostname, sizeof(hostname) ) == -1) fatal_perror( "gethostname" );
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if (!(serverdir = malloc( strlen(confdir) + strlen(SERVERDIR) + strlen(hostname) + 1 )))
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fatal_error( "out of memory\n" );
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strcpy( serverdir, confdir );
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strcat( serverdir, SERVERDIR );
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strcat( serverdir, hostname );
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if (chdir( serverdir ) == -1)
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{
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if (errno != ENOENT) fatal_perror( "chdir %s", serverdir );
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if (mkdir( serverdir, 0700 ) == -1) fatal_perror( "mkdir %s", serverdir );
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if (chdir( serverdir ) == -1) fatal_perror( "chdir %s", serverdir );
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}
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if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
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if (!S_ISDIR(st.st_mode)) fatal_error( "%s is not a directory\n", serverdir );
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if (st.st_uid != getuid()) fatal_error( "%s is not owned by you\n", serverdir );
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if (st.st_mode & 077) fatal_error( "%s must not be accessible by other users\n", serverdir );
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}
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/* open the master server socket and start waiting for new clients */
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void open_master_socket(void)
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{
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struct sockaddr_un addr;
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int fd, slen;
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/* make sure no request is larger than the maximum size */
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assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
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create_server_dir();
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if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
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addr.sun_family = AF_UNIX;
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strcpy( addr.sun_path, SOCKETNAME );
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slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
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#ifdef HAVE_SOCKADDR_SUN_LEN
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addr.sun_len = slen;
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#endif
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if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
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{
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if ((errno == EEXIST) || (errno == EADDRINUSE))
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exit(0); /* pretend we succeeded to start */
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else
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fatal_perror( "bind" );
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}
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atexit( socket_cleanup );
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chmod( SOCKETNAME, 0600 ); /* make sure no other user can connect */
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if (listen( fd, 5 ) == -1) fatal_perror( "listen" );
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if (!(master_socket = alloc_object( &master_socket_ops, fd )))
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fatal_error( "out of memory\n" );
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set_select_events( &master_socket->obj, POLLIN );
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/* setup msghdr structure constant fields */
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = &myiovec;
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msghdr.msg_iovlen = 1;
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/* go in the background */
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switch(fork())
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{
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case -1:
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fatal_perror( "fork" );
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case 0:
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setsid();
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break;
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default:
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_exit(0); /* do not call atexit functions */
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}
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}
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/* close the master socket and stop waiting for new clients */
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void close_master_socket(void)
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{
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/* if a new client is waiting, we keep on running */
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if (!check_select_events( master_socket->obj.fd, POLLIN ))
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release_object( master_socket );
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}
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/* lock/unlock the master socket to stop accepting new clients */
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void lock_master_socket( int locked )
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{
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set_select_events( &master_socket->obj, locked ? 0 : POLLIN );
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}
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