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) internal_function;
  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 internal_function
 195 makefd_xprt (int fd, u_int sendsize, u_int recvsize)
 196 {
 197   SVCXPRT *xprt;
 198   struct tcp_conn *cd;
 199
 200   xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
 201   if (xprt == (SVCXPRT *) NULL)
 202     {
 203       (void) fputs (_("svc_tcp: makefd_xprt: out of memory\n"), stderr);
 204       goto done;
 205     }
 206   cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn));
 207   if (cd == (struct tcp_conn *) NULL)
 208     {
 209       (void) fputs (_("svc_tcp: makefd_xprt: out of memory\n"), stderr);
 210       mem_free ((char *) xprt, sizeof (SVCXPRT));
 211       xprt = (SVCXPRT *) NULL;
 212       goto done;
 213     }
 214   cd->strm_stat = XPRT_IDLE;
 215   xdrrec_create (&(cd->xdrs), sendsize, recvsize,
 216                  (caddr_t) xprt, readtcp, writetcp);
 217   xprt->xp_p2 = NULL;
 218   xprt->xp_p1 = (caddr_t) cd;
 219   xprt->xp_verf.oa_base = cd->verf_body;
 220   xprt->xp_addrlen = 0;
 221   xprt->xp_ops = &svctcp_op;    /* truly deals with calls */
 222   xprt->xp_port = 0;            /* this is a connection, not a rendezvouser */
 223   xprt->xp_sock = fd;
 224   xprt_register (xprt);
 225 done:
 226   return xprt;
 227 }
 228
 229 static bool_t
 230 rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg)
 231 {
 232   int sock;
 233   struct tcp_rendezvous *r;
 234   struct sockaddr_in addr;
 235   size_t len;
 236
 237   r = (struct tcp_rendezvous *) xprt->xp_p1;
 238 again:
 239   len = sizeof (struct sockaddr_in);
 240   if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr,
 241                       &len)) < 0)
 242     {
 243       if (errno == EINTR)
 244         goto again;
 245       return FALSE;
 246     }
 247   /*
 248    * make a new transporter (re-uses xprt)
 249    */
 250   xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
 251   xprt->xp_raddr = addr;
 252   xprt->xp_addrlen = len;
 253   return FALSE;         /* there is never an rpc msg to be processed */
 254 }
 255
 256 static enum xprt_stat
 257 rendezvous_stat (SVCXPRT *xprt)
 258 {
 259   return XPRT_IDLE;
 260 }
 261
 262 static void
 263 svctcp_destroy (SVCXPRT *xprt)
 264 {
 265   struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1;
 266
 267   xprt_unregister (xprt);
 268   (void) close (xprt->xp_sock);
 269   if (xprt->xp_port != 0)
 270     {
 271       /* a rendezvouser socket */
 272       xprt->xp_port = 0;
 273     }
 274   else
 275     {
 276       /* an actual connection socket */
 277       XDR_DESTROY (&(cd->xdrs));
 278     }
 279   mem_free ((caddr_t) cd, sizeof (struct tcp_conn));
 280   mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
 281 }
 282
 283 /*
 284  * All read operations timeout after 35 seconds.
 285  * A timeout is fatal for the connection.
 286  */
 287 static struct timeval wait_per_try =
 288 {35, 0};
 289
 290 /*
 291  * reads data from the tcp connection.
 292  * any error is fatal and the connection is closed.
 293  * (And a read of zero bytes is a half closed stream => error.)
 294  */
 295 static int
 296 readtcp (char *xprtptr, char *buf, int len)
 297 {
 298   SVCXPRT *xprt = (SVCXPRT *)xprtptr;
 299   int sock = xprt->xp_sock;
 300 #ifdef FD_SETSIZE
 301   fd_set mask;
 302   fd_set readfds;
 303
 304   FD_ZERO (&mask);
 305   FD_SET (sock, &mask);
 306 #else
 307   int mask = 1 << sock;
 308   int readfds;
 309 #endif /* def FD_SETSIZE */
 310   do
 311     {
 312       struct timeval timeout = wait_per_try;
 313       readfds = mask;
 314       if (select (_rpc_dtablesize (), &readfds, (fd_set *) NULL,
 315                   (fd_set *) NULL, &timeout) <= 0)
 316         {
 317           if (errno == EINTR)
 318             {
 319               continue;
 320             }
 321           goto fatal_err;
 322         }
 323 #ifdef FD_SETSIZE
 324     }
 325   while (!FD_ISSET (sock, &readfds));
 326 #else
 327     }
 328   while (readfds != mask);
 329 #endif /* def FD_SETSIZE */
 330   if ((len = read (sock, buf, len)) > 0)
 331     {
 332       return len;
 333     }
 334 fatal_err:
 335   ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
 336   return -1;
 337 }
 338
 339 /*
 340  * writes data to the tcp connection.
 341  * Any error is fatal and the connection is closed.
 342  */
 343 static int
 344 writetcp (char *xprtptr, char * buf, int len)
 345 {
 346   SVCXPRT *xprt = (SVCXPRT *)xprtptr;
 347   int i, cnt;
 348
 349   for (cnt = len; cnt > 0; cnt -= i, buf += i)
 350     {
 351       if ((i = write (xprt->xp_sock, buf, cnt)) < 0)
 352         {
 353           ((struct tcp_conn *) (xprt->xp_p1))->strm_stat =
 354             XPRT_DIED;
 355           return (-1);
 356         }
 357     }
 358   return (len);
 359 }
 360
 361 static enum xprt_stat
 362 svctcp_stat (SVCXPRT *xprt)
 363 {
 364   struct tcp_conn *cd =
 365   (struct tcp_conn *) (xprt->xp_p1);
 366
 367   if (cd->strm_stat == XPRT_DIED)
 368     return (XPRT_DIED);
 369   if (!xdrrec_eof (&(cd->xdrs)))
 370     return (XPRT_MOREREQS);
 371   return (XPRT_IDLE);
 372 }
 373
 374 static bool_t
 375 svctcp_recv (xprt, msg)
 376      SVCXPRT *xprt;
 377      struct rpc_msg *msg;
 378 {
 379   struct tcp_conn *cd =
 380   (struct tcp_conn *) (xprt->xp_p1);
 381   XDR *xdrs = &(cd->xdrs);
 382
 383   xdrs->x_op = XDR_DECODE;
 384   (void) xdrrec_skiprecord (xdrs);
 385   if (xdr_callmsg (xdrs, msg))
 386     {
 387       cd->x_id = msg->rm_xid;
 388       return (TRUE);
 389     }
 390   return (FALSE);
 391 }
 392
 393 static bool_t
 394 svctcp_getargs (xprt, xdr_args, args_ptr)
 395      SVCXPRT *xprt;
 396      xdrproc_t xdr_args;
 397      caddr_t args_ptr;
 398 {
 399
 400   return ((*xdr_args) (&(((struct tcp_conn *) (xprt->xp_p1))->xdrs), args_ptr));
 401 }
 402
 403 static bool_t
 404 svctcp_freeargs (xprt, xdr_args, args_ptr)
 405      SVCXPRT *xprt;
 406      xdrproc_t xdr_args;
 407      caddr_t args_ptr;
 408 {
 409   XDR *xdrs =
 410   &(((struct tcp_conn *) (xprt->xp_p1))->xdrs);
 411
 412   xdrs->x_op = XDR_FREE;
 413   return ((*xdr_args) (xdrs, args_ptr));
 414 }
 415
 416 static bool_t
 417 svctcp_reply (xprt, msg)
 418      SVCXPRT *xprt;
 419      struct rpc_msg *msg;
 420 {
 421   struct tcp_conn *cd =
 422   (struct tcp_conn *) (xprt->xp_p1);
 423   XDR *xdrs = &(cd->xdrs);
 424   bool_t stat;
 425
 426   xdrs->x_op = XDR_ENCODE;
 427   msg->rm_xid = cd->x_id;
 428   stat = xdr_replymsg (xdrs, msg);
 429   (void) xdrrec_endofrecord (xdrs, TRUE);
 430   return (stat);
 431 }