scheduler/client.c

   1 /*
   2  * Client part of the client/server communication
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <errno.h>
   9 #include <stdio.h>
  10 #include <string.h>
  11 #include <sys/types.h>
  12 #include <sys/socket.h>
  13 #include <sys/uio.h>
  14 #include <unistd.h>
  15
  16 #include "process.h"
  17 #include "thread.h"
  18 #include "server/request.h"
  19 #include "server.h"
  20 #include "winerror.h"
  21
  22 /* Some versions of glibc don't define this */
  23 #ifndef SCM_RIGHTS
  24 #define SCM_RIGHTS 1
  25 #endif
  26
  27
  28 /***********************************************************************
  29  *           CLIENT_ProtocolError
  30  */
  31 static void CLIENT_ProtocolError( const char *err, ... )
  32 {
  33     THDB *thdb = THREAD_Current();
  34     va_list args;
  35
  36     va_start( args, err );
  37     fprintf( stderr, "Client protocol error:%p: ", thdb->server_tid );
  38     vfprintf( stderr, err, args );
  39     va_end( args );
  40     ExitThread(1);
  41 }
  42
  43
  44 /***********************************************************************
  45  *           CLIENT_SendRequest_v
  46  *
  47  * Send a request to the server.
  48  */
  49 static void CLIENT_SendRequest_v( enum request req, int pass_fd,
  50                                   struct iovec *vec, int veclen )
  51 {
  52     THDB *thdb = THREAD_Current();
  53 #ifndef HAVE_MSGHDR_ACCRIGHTS
  54     struct cmsg_fd cmsg  = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, pass_fd };
  55 #endif
  56     struct msghdr msghdr = { NULL, 0, vec, veclen, };
  57     struct header head;
  58     int i, ret, len;
  59
  60     assert( veclen > 0 );
  61     vec[0].iov_base = &head;
  62     vec[0].iov_len  = sizeof(head);
  63     for (i = len = 0; i < veclen; i++) len += vec[i].iov_len;
  64
  65     assert( len <= MAX_MSG_LENGTH );
  66     head.type = req;
  67     head.len  = len;
  68     head.seq  = thdb->seq++;
  69
  70     if (pass_fd != -1)  /* we have an fd to send */
  71     {
  72 #ifdef HAVE_MSGHDR_ACCRIGHTS
  73         msghdr.msg_accrights = (void *)&pass_fd;
  74         msghdr.msg_accrightslen = sizeof(pass_fd);
  75 #else
  76         msghdr.msg_control    = &cmsg;
  77         msghdr.msg_controllen = sizeof(cmsg);
  78 #endif
  79     }
  80
  81     if ((ret = sendmsg( thdb->socket, &msghdr, 0 )) < len)
  82     {
  83         if (ret == -1) perror( "sendmsg" );
  84         CLIENT_ProtocolError( "partial msg sent %d/%d\n", ret, len );
  85     }
  86     /* we passed the fd now we can close it */
  87     if (pass_fd != -1) close( pass_fd );
  88 }
  89
  90
  91 /***********************************************************************
  92  *           CLIENT_SendRequest
  93  *
  94  * Send a request to the server.
  95  */
  96 void CLIENT_SendRequest( enum request req, int pass_fd,
  97                          int n, ... /* arg_1, len_1, etc. */ )
  98 {
  99     struct iovec vec[16];
 100     va_list args;
 101     int i;
 102
 103     n++;  /* for vec[0] */
 104     assert( n < 16 );
 105     va_start( args, n );
 106     for (i = 1; i < n; i++)
 107     {
 108         vec[i].iov_base = va_arg( args, void * );
 109         vec[i].iov_len  = va_arg( args, int );
 110     }
 111     va_end( args );
 112     return CLIENT_SendRequest_v( req, pass_fd, vec, n );
 113 }
 114
 115
 116 /***********************************************************************
 117  *           CLIENT_WaitReply_v
 118  *
 119  * Wait for a reply from the server.
 120  * Returns the error code (or 0 if OK).
 121  */
 122 static unsigned int CLIENT_WaitReply_v( int *len, int *passed_fd,
 123                                         struct iovec *vec, int veclen )
 124 {
 125     THDB *thdb = THREAD_Current();
 126     int pass_fd = -1;
 127 #ifdef HAVE_MSGHDR_ACCRIGHTS
 128     struct msghdr msghdr = { NULL, 0, vec, veclen, (void*)&pass_fd, sizeof(int) };
 129 #else
 130     struct cmsg_fd cmsg  = { sizeof(cmsg), SOL_SOCKET, SCM_RIGHTS, -1 };
 131     struct msghdr msghdr = { NULL, 0, vec, veclen, &cmsg, sizeof(cmsg), 0 };
 132 #endif
 133     struct header head;
 134     int ret, remaining;
 135
 136     assert( veclen > 0 );
 137     vec[0].iov_base       = &head;
 138     vec[0].iov_len        = sizeof(head);
 139
 140     while ((ret = recvmsg( thdb->socket, &msghdr, 0 )) == -1)
 141     {
 142         if (errno == EINTR) continue;
 143         perror("recvmsg");
 144         CLIENT_ProtocolError( "recvmsg\n" );
 145     }
 146     if (!ret) ExitThread(1); /* the server closed the connection; time to die... */
 147
 148     /* sanity checks */
 149
 150     if (ret < sizeof(head))
 151         CLIENT_ProtocolError( "partial header received %d/%d\n", ret, sizeof(head) );
 152
 153     if ((head.len < sizeof(head)) || (head.len > MAX_MSG_LENGTH))
 154         CLIENT_ProtocolError( "header length %d\n", head.len );
 155
 156     if (head.seq != thdb->seq++)
 157         CLIENT_ProtocolError( "sequence %08x instead of %08x\n", head.seq, thdb->seq - 1 );
 158
 159 #ifndef HAVE_MSGHDR_ACCRIGHTS
 160     pass_fd = cmsg.fd;
 161 #endif
 162
 163     if (head.type != ERROR_SUCCESS)
 164     {
 165         SetLastError( head.type );
 166     }
 167     else if (passed_fd)
 168     {
 169         *passed_fd = pass_fd;
 170         pass_fd = -1;
 171     }
 172
 173     if (len) *len = ret - sizeof(head);
 174     if (pass_fd != -1) close( pass_fd );
 175     remaining = head.len - ret;
 176     while (remaining > 0)  /* drop remaining data */
 177     {
 178         char buffer[1024];
 179         int len = remaining < sizeof(buffer) ? remaining : sizeof(buffer);
 180         if ((len = recv( thdb->socket, buffer, len, 0 )) == -1)
 181         {
 182             perror( "recv" );
 183             CLIENT_ProtocolError( "recv\n" );
 184         }
 185         if (!len) ExitThread(1); /* the server closed the connection; time to die... */
 186         remaining -= len;
 187     }
 188
 189     return head.type;  /* error code */
 190 }
 191
 192
 193 /***********************************************************************
 194  *           CLIENT_WaitReply
 195  *
 196  * Wait for a reply from the server.
 197  */
 198 unsigned int CLIENT_WaitReply( int *len, int *passed_fd,
 199                                int n, ... /* arg_1, len_1, etc. */ )
 200 {
 201     struct iovec vec[16];
 202     va_list args;
 203     int i;
 204
 205     n++;  /* for vec[0] */
 206     assert( n < 16 );
 207     va_start( args, n );
 208     for (i = 1; i < n; i++)
 209     {
 210         vec[i].iov_base = va_arg( args, void * );
 211         vec[i].iov_len  = va_arg( args, int );
 212     }
 213     va_end( args );
 214     return CLIENT_WaitReply_v( len, passed_fd, vec, n );
 215 }
 216
 217
 218 /***********************************************************************
 219  *           CLIENT_WaitSimpleReply
 220  *
 221  * Wait for a simple fixed-length reply from the server.
 222  */
 223 unsigned int CLIENT_WaitSimpleReply( void *reply, int len, int *passed_fd )
 224 {
 225     struct iovec vec[2];
 226     unsigned int ret;
 227     int got;
 228
 229     vec[1].iov_base = reply;
 230     vec[1].iov_len  = len;
 231     ret = CLIENT_WaitReply_v( &got, passed_fd, vec, 2 );
 232     if (got != len)
 233         CLIENT_ProtocolError( "WaitSimpleReply: len %d != %d\n", len, got );
 234     return ret;
 235 }
 236
 237
 238 /***********************************************************************
 239  *           CLIENT_NewThread
 240  *
 241  * Send a new thread request.
 242  */
 243 int CLIENT_NewThread( THDB *thdb, int *thandle, int *phandle )
 244 {
 245     struct new_thread_request request;
 246     struct new_thread_reply reply;
 247     int fd[2];
 248     extern BOOL32 THREAD_InitDone;
 249     extern void server_init( int fd );
 250     extern void select_loop(void);
 251
 252     if (!THREAD_InitDone)  /* first thread -> start the server */
 253     {
 254         int tmpfd[2];
 255         char buffer[16];
 256
 257         if (socketpair( AF_UNIX, SOCK_STREAM, 0, tmpfd ) == -1)
 258         {
 259             perror("socketpair");
 260             exit(1);
 261         }
 262         switch(fork())
 263         {
 264         case -1:  /* error */
 265             perror("fork");
 266             exit(1);
 267         case 0:  /* child */
 268             close( tmpfd[0] );
 269             sprintf( buffer, "%d", tmpfd[1] );
 270 /*#define EXEC_SERVER*/
 271 #ifdef EXEC_SERVER
 272             execlp( "wineserver", "wineserver", buffer, NULL );
 273             execl( "/usr/local/bin/wineserver", "wineserver", buffer, NULL );
 274             execl( "./server/wineserver", "wineserver", buffer, NULL );
 275 #endif
 276             server_init( tmpfd[1] );
 277             select_loop();
 278             exit(0);
 279         default:  /* parent */
 280             close( tmpfd[1] );
 281             SET_CUR_THREAD( thdb );
 282             THREAD_InitDone = TRUE;
 283             thdb->socket = tmpfd[0];
 284             break;
 285         }
 286     }
 287
 288     if (socketpair( AF_UNIX, SOCK_STREAM, 0, fd ) == -1)
 289     {
 290         SetLastError( ERROR_TOO_MANY_OPEN_FILES );  /* FIXME */
 291         return -1;
 292     }
 293
 294     request.pid = thdb->process->server_pid;
 295     CLIENT_SendRequest( REQ_NEW_THREAD, fd[1], 1, &request, sizeof(request) );
 296     if (CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL )) goto error;
 297     thdb->server_tid = reply.tid;
 298     thdb->process->server_pid = reply.pid;
 299     if (thdb->socket != -1) close( thdb->socket );
 300     thdb->socket = fd[0];
 301     thdb->seq = 0;  /* reset the sequence number for the new fd */
 302
 303     if (thandle) *thandle = reply.thandle;
 304     else if (reply.thandle != -1) CLIENT_CloseHandle( reply.thandle );
 305     if (phandle) *phandle = reply.phandle;
 306     else if (reply.phandle != -1) CLIENT_CloseHandle( reply.phandle );
 307     return 0;
 308
 309  error:
 310     close( fd[0] );
 311     return -1;
 312 }
 313
 314
 315 /***********************************************************************
 316  *           CLIENT_InitThread
 317  *
 318  * Send an init thread request. Return 0 if OK.
 319  */
 320 int CLIENT_InitThread(void)
 321 {
 322     THDB *thdb = THREAD_Current();
 323     struct init_thread_request init;
 324     int len = strlen( thdb->process->env_db->cmd_line );
 325
 326     init.unix_pid = getpid();
 327     len = MIN( len, MAX_MSG_LENGTH - sizeof(init) );
 328
 329     CLIENT_SendRequest( REQ_INIT_THREAD, -1, 2,
 330                         &init, sizeof(init),
 331                         thdb->process->env_db->cmd_line, len );
 332     return CLIENT_WaitReply( NULL, NULL, 0 );
 333 }
 334
 335
 336 /***********************************************************************
 337  *           CLIENT_SetDebug
 338  *
 339  * Send a set debug level request. Return 0 if OK.
 340  */
 341 int CLIENT_SetDebug( int level )
 342 {
 343     CLIENT_SendRequest( REQ_SET_DEBUG, -1, 1, &level, sizeof(level) );
 344     return CLIENT_WaitReply( NULL, NULL, 0 );
 345 }
 346
 347 /***********************************************************************
 348  *           CLIENT_CloseHandle
 349  *
 350  * Send a close handle request. Return 0 if OK.
 351  */
 352 int CLIENT_CloseHandle( int handle )
 353 {
 354     CLIENT_SendRequest( REQ_CLOSE_HANDLE, -1, 1, &handle, sizeof(handle) );
 355     return CLIENT_WaitReply( NULL, NULL, 0 );
 356 }
 357
 358 /***********************************************************************
 359  *           CLIENT_DuplicateHandle
 360  *
 361  * Send a duplicate handle request. Return 0 if OK.
 362  */
 363 int CLIENT_DuplicateHandle( int src_process, int src_handle, int dst_process, int dst_handle,
 364                             DWORD access, BOOL32 inherit, DWORD options )
 365 {
 366     struct dup_handle_request req;
 367     struct dup_handle_reply reply;
 368     int len;
 369
 370     req.src_process = src_process;
 371     req.src_handle  = src_handle;
 372     req.dst_process = dst_process;
 373     req.dst_handle  = dst_handle;
 374     req.access      = access;
 375     req.inherit     = inherit;
 376     req.options     = options;
 377
 378     CLIENT_SendRequest( REQ_DUP_HANDLE, -1, 1, &req, sizeof(req) );
 379     CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
 380     return reply.handle;
 381 }
 382
 383
 384 /***********************************************************************
 385  *           CLIENT_OpenProcess
 386  *
 387  * Open a handle to a process.
 388  */
 389 int CLIENT_OpenProcess( void *pid, DWORD access, BOOL32 inherit )
 390 {
 391     struct open_process_request req;
 392     struct open_process_reply reply;
 393
 394     req.pid     = pid;
 395     req.access  = access;
 396     req.inherit = inherit;
 397
 398     CLIENT_SendRequest( REQ_OPEN_PROCESS, -1, 1, &req, sizeof(req) );
 399     CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
 400     return reply.handle;
 401 }
 402
 403
 404 /***********************************************************************
 405  *           CLIENT_Select
 406  */
 407 int CLIENT_Select( int count, int *handles, int flags, int timeout )
 408 {
 409     struct select_request req;
 410     struct select_reply reply;
 411     int len;
 412
 413     req.count   = count;
 414     req.flags   = flags;
 415     req.timeout = timeout;
 416
 417     CLIENT_SendRequest( REQ_SELECT, -1, 2,
 418                         &req, sizeof(req),
 419                         handles, count * sizeof(int) );
 420     CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
 421     return reply.signaled;
 422 }