sunrpc/svc_tcp.c

   1 /* @(#)svc_tcp.c        2.2 88/08/01 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * svc_tcp.c, Server side for TCP/IP based RPC.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  *
  39  * Actually implements two flavors of transporter -
  40  * a tcp rendezvouser (a listener and connection establisher)
  41  * and a record/tcp stream.
  42  */
  43
  44 #include <stdio.h>
  45 #include <unistd.h>
  46 #include <string.h>
  47 #include <rpc/rpc.h>
  48 #include <sys/socket.h>
  49 #include <errno.h>
  50 #include <stdlib.h>
  51
  52 /*
  53  * Ops vector for TCP/IP based rpc service handle
  54  */
  55 static bool_t svctcp_recv (SVCXPRT *, struct rpc_msg *);
  56 static enum xprt_stat svctcp_stat (SVCXPRT *);
  57 static bool_t svctcp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
  58 static bool_t svctcp_reply (SVCXPRT *, struct rpc_msg *);
  59 static bool_t svctcp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
  60 static void svctcp_destroy (SVCXPRT *);
  61
  62 static const struct xp_ops svctcp_op =
  63 {
  64   svctcp_recv,
  65   svctcp_stat,
  66   svctcp_getargs,
  67   svctcp_reply,
  68   svctcp_freeargs,
  69   svctcp_destroy
  70 };
  71
  72 /*
  73  * Ops vector for TCP/IP rendezvous handler
  74  */
  75 static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *);
  76 static enum xprt_stat rendezvous_stat (SVCXPRT *);
  77
  78 static const struct xp_ops svctcp_rendezvous_op =
  79 {
  80   rendezvous_request,
  81   rendezvous_stat,
  82   (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) abort,
  83   (bool_t (*) (SVCXPRT *, struct rpc_msg *)) abort,
  84   (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) abort,
  85   svctcp_destroy
  86 };
  87
  88 static int readtcp (char*, char *, int);
  89 static int writetcp (char *, char *, int);
  90 static SVCXPRT *makefd_xprt (int, u_int, u_int);
  91
  92 struct tcp_rendezvous
  93   {                             /* kept in xprt->xp_p1 */
  94     u_int sendsize;
  95     u_int recvsize;
  96   };
  97
  98 struct tcp_conn
  99   {                             /* kept in xprt->xp_p1 */
 100     enum xprt_stat strm_stat;
 101     u_long x_id;
 102     XDR xdrs;
 103     char verf_body[MAX_AUTH_BYTES];
 104   };
 105
 106 /*
 107  * Usage:
 108  *      xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
 109  *
 110  * Creates, registers, and returns a (rpc) tcp based transporter.
 111  * Once *xprt is initialized, it is registered as a transporter
 112  * see (svc.h, xprt_register).  This routine returns
 113  * a NULL if a problem occurred.
 114  *
 115  * If sock<0 then a socket is created, else sock is used.
 116  * If the socket, sock is not bound to a port then svctcp_create
 117  * binds it to an arbitrary port.  The routine then starts a tcp
 118  * listener on the socket's associated port.  In any (successful) case,
 119  * xprt->xp_sock is the registered socket number and xprt->xp_port is the
 120  * associated port number.
 121  *
 122  * Since tcp streams do buffered io similar to stdio, the caller can specify
 123  * how big the send and receive buffers are via the second and third parms;
 124  * 0 => use the system default.
 125  */
 126 SVCXPRT *
 127 svctcp_create (int sock, u_int sendsize, u_int recvsize)
 128 {
 129   bool_t madesock = FALSE;
 130   SVCXPRT *xprt;
 131   struct tcp_rendezvous *r;
 132   struct sockaddr_in addr;
 133   size_t len = sizeof (struct sockaddr_in);
 134
 135   if (sock == RPC_ANYSOCK)
 136     {
 137       if ((sock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
 138         {
 139           perror (_("svctcp_.c - udp socket creation problem"));
 140           return (SVCXPRT *) NULL;
 141         }
 142       madesock = TRUE;
 143     }
 144   bzero ((char *) &addr, sizeof (addr));
 145   addr.sin_family = AF_INET;
 146   if (bindresvport (sock, &addr))
 147     {
 148       addr.sin_port = 0;
 149       (void) bind (sock, (struct sockaddr *) &addr, len);
 150     }
 151   if ((getsockname (sock, (struct sockaddr *) &addr, &len) != 0) ||
 152       (listen (sock, 2) != 0))
 153     {
 154       perror (_("svctcp_.c - cannot getsockname or listen"));
 155       if (madesock)
 156         (void) close (sock);
 157       return (SVCXPRT *) NULL;
 158     }
 159   r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r));
 160   if (r == NULL)
 161     {
 162       (void) fputs (_("svctcp_create: out of memory\n"), stderr);
 163       return NULL;
 164     }
 165   r->sendsize = sendsize;
 166   r->recvsize = recvsize;
 167   xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
 168   if (xprt == NULL)
 169     {
 170       (void) fputs (_("svctcp_create: out of memory\n"), stderr);
 171       return NULL;
 172     }
 173   xprt->xp_p2 = NULL;
 174   xprt->xp_p1 = (caddr_t) r;
 175   xprt->xp_verf = _null_auth;
 176   xprt->xp_ops = &svctcp_rendezvous_op;
 177   xprt->xp_port = ntohs (addr.sin_port);
 178   xprt->xp_sock = sock;
 179   xprt_register (xprt);
 180   return xprt;
 181 }
 182
 183 /*
 184  * Like svtcp_create(), except the routine takes any *open* UNIX file
 185  * descriptor as its first input.
 186  */
 187 SVCXPRT *
 188 svcfd_create (int fd, u_int sendsize, u_int recvsize)
 189 {
 190   return makefd_xprt (fd, sendsize, recvsize);
 191 }
 192
 193 static SVCXPRT *
 194 makefd_xprt (int fd, u_int sendsize, u_int recvsize)
 195 {
 196   SVCXPRT *xprt;
 197   struct tcp_conn *cd;
 198
 199   xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
 200   if (xprt == (SVCXPRT *) NULL)
 201     {
 202       (void) fputs (_("svc_tcp: makefd_xprt: out of memory\n"), stderr);
 203       goto done;
 204     }
 205   cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn));
 206   if (cd == (struct tcp_conn *) NULL)
 207     {
 208       (void) fputs (_("svc_tcp: makefd_xprt: out of memory\n"), stderr);
 209       mem_free ((char *) xprt, sizeof (SVCXPRT));
 210       xprt = (SVCXPRT *) NULL;
 211       goto done;
 212     }
 213   cd->strm_stat = XPRT_IDLE;
 214   xdrrec_create (&(cd->xdrs), sendsize, recvsize,
 215                  (caddr_t) xprt, readtcp, writetcp);
 216   xprt->xp_p2 = NULL;
 217   xprt->xp_p1 = (caddr_t) cd;
 218   xprt->xp_verf.oa_base = cd->verf_body;
 219   xprt->xp_addrlen = 0;
 220   xprt->xp_ops = &svctcp_op;    /* truly deals with calls */
 221   xprt->xp_port = 0;            /* this is a connection, not a rendezvouser */
 222   xprt->xp_sock = fd;
 223   xprt_register (xprt);
 224 done:
 225   return xprt;
 226 }
 227
 228 static bool_t
 229 rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg)
 230 {
 231   int sock;
 232   struct tcp_rendezvous *r;
 233   struct sockaddr_in addr;
 234   size_t len;
 235
 236   r = (struct tcp_rendezvous *) xprt->xp_p1;
 237 again:
 238   len = sizeof (struct sockaddr_in);
 239   if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr,
 240                       &len)) < 0)
 241     {
 242       if (errno == EINTR)
 243         goto again;
 244       return FALSE;
 245     }
 246   /*
 247    * make a new transporter (re-uses xprt)
 248    */
 249   xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
 250   xprt->xp_raddr = addr;
 251   xprt->xp_addrlen = len;
 252   return FALSE;         /* there is never an rpc msg to be processed */
 253 }
 254
 255 static enum xprt_stat
 256 rendezvous_stat (SVCXPRT *xprt)
 257 {
 258   return XPRT_IDLE;
 259 }
 260
 261 static void
 262 svctcp_destroy (SVCXPRT *xprt)
 263 {
 264   struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1;
 265
 266   xprt_unregister (xprt);
 267   (void) close (xprt->xp_sock);
 268   if (xprt->xp_port != 0)
 269     {
 270       /* a rendezvouser socket */
 271       xprt->xp_port = 0;
 272     }
 273   else
 274     {
 275       /* an actual connection socket */
 276       XDR_DESTROY (&(cd->xdrs));
 277     }
 278   mem_free ((caddr_t) cd, sizeof (struct tcp_conn));
 279   mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
 280 }
 281
 282 /*
 283  * All read operations timeout after 35 seconds.
 284  * A timeout is fatal for the connection.
 285  */
 286 static struct timeval wait_per_try =
 287 {35, 0};
 288
 289 /*
 290  * reads data from the tcp connection.
 291  * any error is fatal and the connection is closed.
 292  * (And a read of zero bytes is a half closed stream => error.)
 293  */
 294 static int
 295 readtcp (char *xprtptr, char *buf, int len)
 296 {
 297   SVCXPRT *xprt = (SVCXPRT *)xprtptr;
 298   int sock = xprt->xp_sock;
 299 #ifdef FD_SETSIZE
 300   fd_set mask;
 301   fd_set readfds;
 302
 303   FD_ZERO (&mask);
 304   FD_SET (sock, &mask);
 305 #else
 306   int mask = 1 << sock;
 307   int readfds;
 308 #endif /* def FD_SETSIZE */
 309   do
 310     {
 311       struct timeval timeout = wait_per_try;
 312       readfds = mask;
 313       if (select (_rpc_dtablesize (), &readfds, (fd_set *) NULL,
 314                   (fd_set *) NULL, &timeout) <= 0)
 315         {
 316           if (errno == EINTR)
 317             {
 318               continue;
 319             }
 320           goto fatal_err;
 321         }
 322 #ifdef FD_SETSIZE
 323     }
 324   while (!FD_ISSET (sock, &readfds));
 325 #else
 326     }
 327   while (readfds != mask);
 328 #endif /* def FD_SETSIZE */
 329   if ((len = read (sock, buf, len)) > 0)
 330     {
 331       return len;
 332     }
 333 fatal_err:
 334   ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
 335   return -1;
 336 }
 337
 338 /*
 339  * writes data to the tcp connection.
 340  * Any error is fatal and the connection is closed.
 341  */
 342 static int
 343 writetcp (char *xprtptr, char * buf, int len)
 344 {
 345   SVCXPRT *xprt = (SVCXPRT *)xprtptr;
 346   int i, cnt;
 347
 348   for (cnt = len; cnt > 0; cnt -= i, buf += i)
 349     {
 350       if ((i = write (xprt->xp_sock, buf, cnt)) < 0)
 351         {
 352           ((struct tcp_conn *) (xprt->xp_p1))->strm_stat =
 353             XPRT_DIED;
 354           return (-1);
 355         }
 356     }
 357   return (len);
 358 }
 359
 360 static enum xprt_stat
 361 svctcp_stat (SVCXPRT *xprt)
 362 {
 363   struct tcp_conn *cd =
 364   (struct tcp_conn *) (xprt->xp_p1);
 365
 366   if (cd->strm_stat == XPRT_DIED)
 367     return (XPRT_DIED);
 368   if (!xdrrec_eof (&(cd->xdrs)))
 369     return (XPRT_MOREREQS);
 370   return (XPRT_IDLE);
 371 }
 372
 373 static bool_t
 374 svctcp_recv (xprt, msg)
 375      SVCXPRT *xprt;
 376      struct rpc_msg *msg;
 377 {
 378   struct tcp_conn *cd =
 379   (struct tcp_conn *) (xprt->xp_p1);
 380   XDR *xdrs = &(cd->xdrs);
 381
 382   xdrs->x_op = XDR_DECODE;
 383   (void) xdrrec_skiprecord (xdrs);
 384   if (xdr_callmsg (xdrs, msg))
 385     {
 386       cd->x_id = msg->rm_xid;
 387       return (TRUE);
 388     }
 389   return (FALSE);
 390 }
 391
 392 static bool_t
 393 svctcp_getargs (xprt, xdr_args, args_ptr)
 394      SVCXPRT *xprt;
 395      xdrproc_t xdr_args;
 396      caddr_t args_ptr;
 397 {
 398
 399   return ((*xdr_args) (&(((struct tcp_conn *) (xprt->xp_p1))->xdrs), args_ptr));
 400 }
 401
 402 static bool_t
 403 svctcp_freeargs (xprt, xdr_args, args_ptr)
 404      SVCXPRT *xprt;
 405      xdrproc_t xdr_args;
 406      caddr_t args_ptr;
 407 {
 408   XDR *xdrs =
 409   &(((struct tcp_conn *) (xprt->xp_p1))->xdrs);
 410
 411   xdrs->x_op = XDR_FREE;
 412   return ((*xdr_args) (xdrs, args_ptr));
 413 }
 414
 415 static bool_t
 416 svctcp_reply (xprt, msg)
 417      SVCXPRT *xprt;
 418      struct rpc_msg *msg;
 419 {
 420   struct tcp_conn *cd =
 421   (struct tcp_conn *) (xprt->xp_p1);
 422   XDR *xdrs = &(cd->xdrs);
 423   bool_t stat;
 424
 425   xdrs->x_op = XDR_ENCODE;
 426   msg->rm_xid = cd->x_id;
 427   stat = xdr_replymsg (xdrs, msg);
 428   (void) xdrrec_endofrecord (xdrs, TRUE);
 429   return (stat);
 430 }