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