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 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_NewThread
 220  *
 221  * Send a new thread request.
 222  */
 223 int CLIENT_NewThread( THDB *thdb, int *thandle, int *phandle )
 224 {
 225     struct new_thread_request request;
 226     struct new_thread_reply reply;
 227     int len, fd[2];
 228     extern BOOL32 THREAD_InitDone;
 229     extern void server_init( int fd );
 230     extern void select_loop(void);
 231
 232     if (!THREAD_InitDone)  /* first thread -> start the server */
 233     {
 234         int tmpfd[2];
 235         char buffer[16];
 236
 237         if (socketpair( AF_UNIX, SOCK_STREAM, 0, tmpfd ) == -1)
 238         {
 239             perror("socketpair");
 240             exit(1);
 241         }
 242         switch(fork())
 243         {
 244         case -1:  /* error */
 245             perror("fork");
 246             exit(1);
 247         case 0:  /* child */
 248             close( tmpfd[0] );
 249             sprintf( buffer, "%d", tmpfd[1] );
 250 /*#define EXEC_SERVER*/
 251 #ifdef EXEC_SERVER
 252             execlp( "wineserver", "wineserver", buffer, NULL );
 253             execl( "/usr/local/bin/wineserver", "wineserver", buffer, NULL );
 254             execl( "./server/wineserver", "wineserver", buffer, NULL );
 255 #endif
 256             server_init( tmpfd[1] );
 257             select_loop();
 258             exit(0);
 259         default:  /* parent */
 260             close( tmpfd[1] );
 261             SET_CUR_THREAD( thdb );
 262             THREAD_InitDone = TRUE;
 263             thdb->socket = tmpfd[0];
 264             break;
 265         }
 266     }
 267
 268     if (socketpair( AF_UNIX, SOCK_STREAM, 0, fd ) == -1)
 269     {
 270         SetLastError( ERROR_TOO_MANY_OPEN_FILES );  /* FIXME */
 271         return -1;
 272     }
 273
 274     request.pid = thdb->process->server_pid;
 275     CLIENT_SendRequest( REQ_NEW_THREAD, fd[1], 1, &request, sizeof(request) );
 276
 277     if (CLIENT_WaitReply( &len, NULL, 1, &reply, sizeof(reply) )) goto error;
 278     if (len < sizeof(reply)) goto error;
 279     thdb->server_tid = reply.tid;
 280     thdb->process->server_pid = reply.pid;
 281     if (thdb->socket != -1) close( thdb->socket );
 282     thdb->socket = fd[0];
 283     thdb->seq = 0;  /* reset the sequence number for the new fd */
 284
 285     /* we don't need the handles for now */
 286     if (thandle) *thandle = reply.thandle;
 287     else if (reply.thandle != -1) CLIENT_CloseHandle( reply.thandle );
 288     if (phandle) *phandle = reply.phandle;
 289     else if (reply.phandle != -1) CLIENT_CloseHandle( reply.phandle );
 290     return 0;
 291
 292  error:
 293     close( fd[0] );
 294     return -1;
 295 }
 296
 297
 298 /***********************************************************************
 299  *           CLIENT_InitThread
 300  *
 301  * Send an init thread request. Return 0 if OK.
 302  */
 303 int CLIENT_InitThread(void)
 304 {
 305     THDB *thdb = THREAD_Current();
 306     struct init_thread_request init;
 307     int len = strlen( thdb->process->env_db->cmd_line );
 308
 309     init.unix_pid = getpid();
 310     len = MIN( len, MAX_MSG_LENGTH - sizeof(init) );
 311
 312     CLIENT_SendRequest( REQ_INIT_THREAD, -1, 2,
 313                         &init, sizeof(init),
 314                         thdb->process->env_db->cmd_line, len );
 315     return CLIENT_WaitReply( NULL, NULL, 0 );
 316 }
 317
 318
 319 /***********************************************************************
 320  *           CLIENT_SetDebug
 321  *
 322  * Send a set debug level request. Return 0 if OK.
 323  */
 324 int CLIENT_SetDebug( int level )
 325 {
 326     CLIENT_SendRequest( REQ_SET_DEBUG, -1, 1, &level, sizeof(level) );
 327     return CLIENT_WaitReply( NULL, NULL, 0 );
 328 }
 329
 330 /***********************************************************************
 331  *           CLIENT_CloseHandle
 332  *
 333  * Send a close handle request. Return 0 if OK.
 334  */
 335 int CLIENT_CloseHandle( int handle )
 336 {
 337     CLIENT_SendRequest( REQ_CLOSE_HANDLE, -1, 1, &handle, sizeof(handle) );
 338     return CLIENT_WaitReply( NULL, NULL, 0 );
 339 }
 340
 341 /***********************************************************************
 342  *           CLIENT_DuplicateHandle
 343  *
 344  * Send a duplicate handle request. Return 0 if OK.
 345  */
 346 int CLIENT_DuplicateHandle( int src_process, int src_handle, int dst_process, int dst_handle,
 347                             DWORD access, BOOL32 inherit, DWORD options )
 348 {
 349     struct dup_handle_request req;
 350     struct dup_handle_reply reply;
 351     int len;
 352
 353     req.src_process = src_process;
 354     req.src_handle  = src_handle;
 355     req.dst_process = dst_process;
 356     req.dst_handle  = dst_handle;
 357     req.access      = access;
 358     req.inherit     = inherit;
 359     req.options     = options;
 360
 361     CLIENT_SendRequest( REQ_DUP_HANDLE, -1, 1, &req, sizeof(req) );
 362     CLIENT_WaitReply( &len, NULL, 1, &reply, sizeof(reply) );
 363     CHECK_LEN( len, sizeof(reply) );
 364     return reply.handle;
 365 }
 366
 367
 368 /***********************************************************************
 369  *           CLIENT_GetProcessInfo
 370  *
 371  * Send a get process info request. Return 0 if OK.
 372  */
 373 int CLIENT_GetProcessInfo( int handle, struct get_process_info_reply *reply )
 374 {
 375     int len, err;
 376
 377     CLIENT_SendRequest( REQ_GET_PROCESS_INFO, -1, 1, &handle, sizeof(handle) );
 378     err = CLIENT_WaitReply( &len, NULL, 1, reply, sizeof(*reply) );
 379     CHECK_LEN( len, sizeof(*reply) );
 380     return err;
 381 }
 382
 383
 384 /***********************************************************************
 385  *           CLIENT_GetThreadInfo
 386  *
 387  * Send a get thread info request. Return 0 if OK.
 388  */
 389 int CLIENT_GetThreadInfo( int handle, struct get_thread_info_reply *reply )
 390 {
 391     int len, err;
 392
 393     CLIENT_SendRequest( REQ_GET_THREAD_INFO, -1, 1, &handle, sizeof(handle) );
 394     err = CLIENT_WaitReply( &len, NULL, 1, reply, sizeof(*reply) );
 395     CHECK_LEN( len, sizeof(*reply) );
 396     return err;
 397 }
 398
 399
 400 /***********************************************************************
 401  *           CLIENT_OpenProcess
 402  *
 403  * Open a handle to a process.
 404  */
 405 int CLIENT_OpenProcess( void *pid, DWORD access, BOOL32 inherit )
 406 {
 407     struct open_process_request req;
 408     struct open_process_reply reply;
 409     int len;
 410
 411     req.pid     = pid;
 412     req.access  = access;
 413     req.inherit = inherit;
 414
 415     CLIENT_SendRequest( REQ_OPEN_PROCESS, -1, 1, &req, sizeof(req) );
 416     CLIENT_WaitReply( &len, NULL, 1, &reply, sizeof(reply) );
 417     CHECK_LEN( len, sizeof(reply) );
 418     return reply.handle;
 419 }
 420
 421
 422 /***********************************************************************
 423  *           CLIENT_Select
 424  */
 425 int CLIENT_Select( int count, int *handles, int flags, int timeout )
 426 {
 427     struct select_request req;
 428     struct select_reply reply;
 429     int len;
 430
 431     req.count   = count;
 432     req.flags   = flags;
 433     req.timeout = timeout;
 434
 435     CLIENT_SendRequest( REQ_SELECT, -1, 2,
 436                         &req, sizeof(req),
 437                         handles, count * sizeof(int) );
 438     CLIENT_WaitReply( &len, NULL, 1, &reply, sizeof(reply) );
 439     CHECK_LEN( len, sizeof(reply) );
 440     return reply.signaled;
 441 }