502 lines
14 KiB
C
502 lines
14 KiB
C
/*
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* Client part of the client/server communication
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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 <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.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/un.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "process.h"
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#include "thread.h"
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#include "server.h"
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#include "winerror.h"
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#include "options.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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#define SERVERDIR "/wineserver-" /* server socket directory (hostname appended) */
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#define SOCKETNAME "socket" /* name of the socket file */
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/* data structure used to pass an fd with sendmsg/recvmsg */
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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 void *boot_thread_id;
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/* die on a fatal error; use only during initialization */
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static 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, "wine: " );
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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; use only during initialization */
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static 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, "wine: " );
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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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/***********************************************************************
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* server_protocol_error
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*/
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void server_protocol_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, "Client protocol error:%p: ", NtCurrentTeb()->tid );
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vfprintf( stderr, err, args );
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va_end( args );
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SYSDEPS_ExitThread(1);
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}
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/***********************************************************************
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* server_perror
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*/
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static void server_perror( const char *err )
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{
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fprintf( stderr, "Client protocol error:%p: ", NtCurrentTeb()->tid );
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perror( err );
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SYSDEPS_ExitThread(1);
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}
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/***********************************************************************
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* send_request
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*
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* Send a request to the server.
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*/
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static void send_request( enum request req )
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{
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int ret;
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if ((ret = write( NtCurrentTeb()->socket, &req, sizeof(req) )) == sizeof(req))
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return;
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if (ret == -1)
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{
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if (errno == EPIPE) SYSDEPS_ExitThread(0);
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server_perror( "sendmsg" );
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}
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server_protocol_error( "partial msg sent %d/%d\n", ret, sizeof(req) );
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}
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/***********************************************************************
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* send_request_fd
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*
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* Send a request to the server, passing a file descriptor.
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*/
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static void send_request_fd( enum request req, int fd )
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{
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int ret;
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#ifndef HAVE_MSGHDR_ACCRIGHTS
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struct cmsg_fd cmsg;
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#endif
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struct msghdr msghdr;
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struct iovec vec;
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vec.iov_base = (void *)&req;
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vec.iov_len = sizeof(req);
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = &vec;
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msghdr.msg_iovlen = 1;
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#ifdef HAVE_MSGHDR_ACCRIGHTS
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msghdr.msg_accrights = (void *)&fd;
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msghdr.msg_accrightslen = sizeof(fd);
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#else /* HAVE_MSGHDR_ACCRIGHTS */
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cmsg.len = sizeof(cmsg);
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cmsg.level = SOL_SOCKET;
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cmsg.type = SCM_RIGHTS;
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cmsg.fd = fd;
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msghdr.msg_control = &cmsg;
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msghdr.msg_controllen = sizeof(cmsg);
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msghdr.msg_flags = 0;
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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if ((ret = sendmsg( NtCurrentTeb()->socket, &msghdr, 0 )) == sizeof(req)) return;
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if (ret == -1)
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{
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if (errno == EPIPE) SYSDEPS_ExitThread(0);
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server_perror( "sendmsg" );
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}
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server_protocol_error( "partial msg sent %d/%d\n", ret, sizeof(req) );
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}
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/***********************************************************************
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* wait_reply
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*
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* Wait for a reply from the server.
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*/
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static unsigned int wait_reply(void)
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{
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int ret;
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unsigned int res;
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for (;;)
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{
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if ((ret = read( NtCurrentTeb()->socket, &res, sizeof(res) )) == sizeof(res))
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return res;
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if (!ret) break;
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if (ret == -1)
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{
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if (errno == EINTR) continue;
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if (errno == EPIPE) break;
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server_perror("read");
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}
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server_protocol_error( "partial msg received %d/%d\n", ret, sizeof(res) );
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}
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/* the server closed the connection; time to die... */
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SYSDEPS_ExitThread(0);
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}
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/***********************************************************************
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* wait_reply_fd
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*
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* Wait for a reply from the server, when a file descriptor is passed.
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*/
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static unsigned int wait_reply_fd( int *fd )
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{
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struct iovec vec;
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int ret;
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unsigned int res;
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#ifdef HAVE_MSGHDR_ACCRIGHTS
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struct msghdr msghdr;
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*fd = -1;
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msghdr.msg_accrights = (void *)fd;
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msghdr.msg_accrightslen = sizeof(*fd);
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#else /* HAVE_MSGHDR_ACCRIGHTS */
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struct msghdr msghdr;
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struct cmsg_fd cmsg;
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cmsg.len = sizeof(cmsg);
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cmsg.level = SOL_SOCKET;
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cmsg.type = SCM_RIGHTS;
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cmsg.fd = -1;
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msghdr.msg_control = &cmsg;
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msghdr.msg_controllen = sizeof(cmsg);
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msghdr.msg_flags = 0;
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#endif /* HAVE_MSGHDR_ACCRIGHTS */
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msghdr.msg_name = NULL;
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msghdr.msg_namelen = 0;
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msghdr.msg_iov = &vec;
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msghdr.msg_iovlen = 1;
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vec.iov_base = (void *)&res;
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vec.iov_len = sizeof(res);
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for (;;)
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{
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if ((ret = recvmsg( NtCurrentTeb()->socket, &msghdr, 0 )) == sizeof(res))
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{
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#ifndef HAVE_MSGHDR_ACCRIGHTS
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*fd = cmsg.fd;
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#endif
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return res;
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}
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if (!ret) break;
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if (ret == -1)
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{
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if (errno == EINTR) continue;
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if (errno == EPIPE) break;
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server_perror("recvmsg");
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}
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server_protocol_error( "partial seq received %d/%d\n", ret, sizeof(res) );
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}
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/* the server closed the connection; time to die... */
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SYSDEPS_ExitThread(0);
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}
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/***********************************************************************
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* server_call_noerr
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*
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* Perform a server call.
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*/
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unsigned int server_call_noerr( enum request req )
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{
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send_request( req );
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return wait_reply();
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}
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/***********************************************************************
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* server_call_fd
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*
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* Perform a server call, passing a file descriptor.
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* If *fd is != -1, it will be passed to the server.
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* If the server passes an fd, it will be stored into *fd.
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*/
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unsigned int server_call_fd( enum request req, int fd_out, int *fd_in )
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{
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unsigned int res;
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if (fd_out == -1) send_request( req );
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else send_request_fd( req, fd_out );
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if (fd_in) res = wait_reply_fd( fd_in );
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else res = wait_reply();
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if (res) SetLastError( RtlNtStatusToDosError(res) );
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return res; /* error code */
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}
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/***********************************************************************
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* start_server
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*
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* Start a new wine server.
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*/
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static void start_server( const char *oldcwd )
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{
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static int started; /* we only try once */
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if (!started)
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{
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int pid = fork();
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if (pid == -1) fatal_perror( "fork" );
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if (!pid)
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{
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char *path, *p;
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/* first try the installation dir */
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execl( BINDIR "/wineserver", "wineserver", NULL );
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if (oldcwd) chdir( oldcwd );
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/* now try the dir we were launched from */
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if (!(path = malloc( strlen(argv0) + 20 )))
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fatal_error( "out of memory\n" );
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if ((p = strrchr( strcpy( path, argv0 ), '/' )))
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{
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strcpy( p, "/wineserver" );
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execl( path, "wineserver", NULL );
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strcpy( p, "/server/wineserver" );
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execl( path, "wineserver", NULL );
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}
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/* now try the path */
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execlp( "wineserver", "wineserver", NULL );
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/* and finally the current dir */
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execl( "./server/wineserver", "wineserver", NULL );
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fatal_error( "could not exec wineserver\n" );
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}
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started = 1;
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}
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}
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/***********************************************************************
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* server_connect
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*
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* Attempt to connect to an existing server socket.
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* We need to be in the server directory already.
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*/
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static int server_connect( const char *oldcwd, const char *serverdir )
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{
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struct sockaddr_un addr;
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struct stat st;
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int s, slen;
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if (chdir( serverdir ) == -1)
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{
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if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
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start_server( NULL );
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return -1;
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}
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if (stat( ".", &st ) == -1) fatal_perror( "stat %s", 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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if (lstat( SOCKETNAME, &st ) == -1)
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{
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if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
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start_server( oldcwd );
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return -1;
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}
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if (!S_ISSOCK(st.st_mode))
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fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
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if (st.st_uid != getuid())
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fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
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if ((s = 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 (connect( s, (struct sockaddr *)&addr, slen ) == -1)
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{
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close( s );
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return -2;
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}
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fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
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return s;
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}
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/***********************************************************************
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* CLIENT_InitServer
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*
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* Start the server and create the initial socket pair.
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*/
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int CLIENT_InitServer(void)
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{
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int delay, fd, size;
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const char *env_fd;
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char hostname[64];
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char *oldcwd, *serverdir;
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const char *configdir;
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/* first check if we inherited the socket fd */
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if ((env_fd = getenv( "__WINE_FD" )) && isdigit(env_fd[0]))
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{
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fd = atoi( env_fd );
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if (fcntl( fd, F_SETFD, 1 ) != -1) return fd; /* set close on exec flag */
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}
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/* retrieve the current directory */
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for (size = 512; ; size *= 2)
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{
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if (!(oldcwd = malloc( size ))) break;
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if (getcwd( oldcwd, size )) break;
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free( oldcwd );
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if (errno == ERANGE) continue;
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oldcwd = NULL;
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break;
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}
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/* get the server directory name */
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if (gethostname( hostname, sizeof(hostname) ) == -1) fatal_perror( "gethostname" );
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configdir = PROFILE_GetConfigDir();
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serverdir = malloc( strlen(configdir) + strlen(SERVERDIR) + strlen(hostname) + 1 );
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if (!serverdir) fatal_error( "out of memory\n" );
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strcpy( serverdir, configdir );
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strcat( serverdir, SERVERDIR );
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strcat( serverdir, hostname );
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/* try to connect, leaving some time for the server to start up */
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for (delay = 10000; delay < 500000; delay += delay / 2)
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{
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if ((fd = server_connect( oldcwd, serverdir )) >= 0) goto done;
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usleep( delay );
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}
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if (fd == -2)
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{
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fatal_error( "'%s/%s' exists,\n"
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" but I cannot connect to it; maybe the server has crashed?\n"
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" If this is the case, you should remove the socket file and try again.\n",
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serverdir, SOCKETNAME );
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}
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fatal_error( "could not start wineserver, giving up\n" );
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done:
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/* switch back to the starting directory */
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if (oldcwd)
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{
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chdir( oldcwd );
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free( oldcwd );
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}
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return fd;
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}
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/***********************************************************************
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* CLIENT_InitThread
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*
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* Send an init thread request. Return 0 if OK.
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*/
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int CLIENT_InitThread(void)
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{
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struct get_thread_buffer_request *first_req;
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struct init_thread_request *req;
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TEB *teb = NtCurrentTeb();
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int fd;
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if (wait_reply_fd( &fd ) || (fd == -1))
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server_protocol_error( "no fd passed on first request\n" );
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if ((teb->buffer_size = lseek( fd, 0, SEEK_END )) == -1) server_perror( "lseek" );
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teb->buffer = mmap( 0, teb->buffer_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
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close( fd );
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if (teb->buffer == (void*)-1) server_perror( "mmap" );
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first_req = teb->buffer;
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teb->process->server_pid = first_req->pid;
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teb->tid = first_req->tid;
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if (first_req->version != SERVER_PROTOCOL_VERSION)
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server_protocol_error( "version mismatch %d/%d.\n"
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"Your %s binary was not upgraded correctly,\n"
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"or you have an older one somewhere in your PATH.\n",
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first_req->version, SERVER_PROTOCOL_VERSION,
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(first_req->version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
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if (first_req->boot) boot_thread_id = teb->tid;
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else if (boot_thread_id == teb->tid) boot_thread_id = 0;
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req = teb->buffer;
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req->unix_pid = getpid();
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req->teb = teb;
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req->entry = teb->entry_point;
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return server_call_noerr( REQ_INIT_THREAD );
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}
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/***********************************************************************
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* CLIENT_BootDone
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*
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* Signal that we have finished booting, and set debug level.
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*/
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int CLIENT_BootDone( int debug_level )
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{
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struct boot_done_request *req = get_req_buffer();
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req->debug_level = debug_level;
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return server_call( REQ_BOOT_DONE );
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}
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/***********************************************************************
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* CLIENT_IsBootThread
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*
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* Return TRUE if current thread is the boot thread.
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*/
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int CLIENT_IsBootThread(void)
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{
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return (GetCurrentThreadId() == (DWORD)boot_thread_id);
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}
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