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 0
  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 #define __FORCE_GLIBC
  45 #include <features.h>
  46
  47 #include <stdio.h>
  48 #include <unistd.h>
  49 #include <string.h>
  50 #include <rpc/rpc.h>
  51 #include <sys/socket.h>
  52 #include <sys/poll.h>
  53 #include <errno.h>
  54 #include <stdlib.h>
  55
  56 #ifdef USE_IN_LIBIO
  57 # include <wchar.h>
  58 # include <libio/iolibio.h>
  59 # define fputs(s, f) _IO_fputs (s, f)
  60 #endif
  61
  62
  63 /*
  64  * Ops vector for TCP/IP based rpc service handle
  65  */
  66 static bool_t svctcp_recv (SVCXPRT *, struct rpc_msg *);
  67 static enum xprt_stat svctcp_stat (SVCXPRT *);
  68 static bool_t svctcp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
  69 static bool_t svctcp_reply (SVCXPRT *, struct rpc_msg *);
  70 static bool_t svctcp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
  71 static void svctcp_destroy (SVCXPRT *);
  72
  73 static const struct xp_ops svctcp_op =
  74 {
  75   svctcp_recv,
  76   svctcp_stat,
  77   svctcp_getargs,
  78   svctcp_reply,
  79   svctcp_freeargs,
  80   svctcp_destroy
  81 };
  82
  83 /*
  84  * Ops vector for TCP/IP rendezvous handler
  85  */
  86 static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *);
  87 static enum xprt_stat rendezvous_stat (SVCXPRT *);
  88 static void svctcp_rendezvous_abort (void) attribute_noreturn;
  89
  90 /* This function makes sure abort() relocation goes through PLT
  91    and thus can be lazy bound.  */
  92 static void
  93 svctcp_rendezvous_abort (void)
  94 {
  95   abort ();
  96 };
  97
  98 static const struct xp_ops svctcp_rendezvous_op =
  99 {
 100   rendezvous_request,
 101   rendezvous_stat,
 102   (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
 103   (bool_t (*) (SVCXPRT *, struct rpc_msg *)) svctcp_rendezvous_abort,
 104   (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort,
 105   svctcp_destroy
 106 };
 107
 108 static int readtcp (char*, char *, int);
 109 static int writetcp (char *, char *, int);
 110 static SVCXPRT *makefd_xprt (int, u_int, u_int) internal_function;
 111
 112 struct tcp_rendezvous
 113   {                             /* kept in xprt->xp_p1 */
 114     u_int sendsize;
 115     u_int recvsize;
 116   };
 117
 118 struct tcp_conn
 119   {                             /* kept in xprt->xp_p1 */
 120     enum xprt_stat strm_stat;
 121     u_long x_id;
 122     XDR xdrs;
 123     char verf_body[MAX_AUTH_BYTES];
 124   };
 125
 126 /*
 127  * Usage:
 128  *      xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
 129  *
 130  * Creates, registers, and returns a (rpc) tcp based transporter.
 131  * Once *xprt is initialized, it is registered as a transporter
 132  * see (svc.h, xprt_register).  This routine returns
 133  * a NULL if a problem occurred.
 134  *
 135  * If sock<0 then a socket is created, else sock is used.
 136  * If the socket, sock is not bound to a port then svctcp_create
 137  * binds it to an arbitrary port.  The routine then starts a tcp
 138  * listener on the socket's associated port.  In any (successful) case,
 139  * xprt->xp_sock is the registered socket number and xprt->xp_port is the
 140  * associated port number.
 141  *
 142  * Since tcp streams do buffered io similar to stdio, the caller can specify
 143  * how big the send and receive buffers are via the second and third parms;
 144  * 0 => use the system default.
 145  */
 146 SVCXPRT *
 147 svctcp_create (int sock, u_int sendsize, u_int recvsize)
 148 {
 149   bool_t madesock = FALSE;
 150   SVCXPRT *xprt;
 151   struct tcp_rendezvous *r;
 152   struct sockaddr_in addr;
 153   socklen_t len = sizeof (struct sockaddr_in);
 154
 155   if (sock == RPC_ANYSOCK)
 156     {
 157       if ((sock = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
 158         {
 159           perror (_("svc_tcp.c - tcp socket creation problem"));
 160           return (SVCXPRT *) NULL;
 161         }
 162       madesock = TRUE;
 163     }
 164   memset ((char *) &addr, 0, sizeof (addr));
 165   addr.sin_family = AF_INET;
 166   if (bindresvport (sock, &addr))
 167     {
 168       addr.sin_port = 0;
 169       (void) bind (sock, (struct sockaddr *) &addr, len);
 170     }
 171   if ((getsockname (sock, (struct sockaddr *) &addr, &len) != 0) ||
 172       (listen (sock, 2) != 0))
 173     {
 174       perror (_("svc_tcp.c - cannot getsockname or listen"));
 175       if (madesock)
 176         (void) close (sock);
 177       return (SVCXPRT *) NULL;
 178     }
 179   r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r));
 180   xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
 181   if (r == NULL || xprt == NULL)
 182     {
 183 #ifdef USE_IN_LIBIO
 184       if (_IO_fwide (stderr, 0) > 0)
 185         (void) __fwprintf (stderr, L"%s", _("svctcp_create: out of memory\n"));
 186       else
 187 #endif
 188         (void) fputs (_("svctcp_create: out of memory\n"), stderr);
 189       mem_free (r, sizeof (*r));
 190       mem_free (xprt, sizeof (SVCXPRT));
 191       return NULL;
 192     }
 193   r->sendsize = sendsize;
 194   r->recvsize = recvsize;
 195   xprt->xp_p2 = NULL;
 196   xprt->xp_p1 = (caddr_t) r;
 197   xprt->xp_verf = _null_auth;
 198   xprt->xp_ops = &svctcp_rendezvous_op;
 199   xprt->xp_port = ntohs (addr.sin_port);
 200   xprt->xp_sock = sock;
 201   xprt_register (xprt);
 202   return xprt;
 203 }
 204
 205 /*
 206  * Like svtcp_create(), except the routine takes any *open* UNIX file
 207  * descriptor as its first input.
 208  */
 209 SVCXPRT *
 210 svcfd_create (int fd, u_int sendsize, u_int recvsize);
 211 SVCXPRT *
 212 svcfd_create (int fd, u_int sendsize, u_int recvsize)
 213 {
 214   return makefd_xprt (fd, sendsize, recvsize);
 215 }
 216
 217 static SVCXPRT *
 218 internal_function
 219 makefd_xprt (int fd, u_int sendsize, u_int recvsize)
 220 {
 221   SVCXPRT *xprt;
 222   struct tcp_conn *cd;
 223
 224   xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
 225   cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn));
 226   if (xprt == (SVCXPRT *) NULL || cd == NULL)
 227     {
 228 #ifdef USE_IN_LIBIO
 229       if (_IO_fwide (stderr, 0) > 0)
 230         (void) __fwprintf (stderr, L"%s",
 231                            _("svc_tcp: makefd_xprt: out of memory\n"));
 232       else
 233 #endif
 234         (void) fputs (_("svc_tcp: makefd_xprt: out of memory\n"), stderr);
 235       mem_free (xprt, sizeof (SVCXPRT));
 236       mem_free (cd, sizeof (struct tcp_conn));
 237       return NULL;
 238     }
 239   cd->strm_stat = XPRT_IDLE;
 240   xdrrec_create (&(cd->xdrs), sendsize, recvsize,
 241                  (caddr_t) xprt, readtcp, writetcp);
 242   xprt->xp_p2 = NULL;
 243   xprt->xp_p1 = (caddr_t) cd;
 244   xprt->xp_verf.oa_base = cd->verf_body;
 245   xprt->xp_addrlen = 0;
 246   xprt->xp_ops = &svctcp_op;    /* truly deals with calls */
 247   xprt->xp_port = 0;            /* this is a connection, not a rendezvouser */
 248   xprt->xp_sock = fd;
 249   xprt_register (xprt);
 250   return xprt;
 251 }
 252
 253 static bool_t
 254 rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg attribute_unused)
 255 {
 256   int sock;
 257   struct tcp_rendezvous *r;
 258   struct sockaddr_in addr;
 259   socklen_t len;
 260
 261   r = (struct tcp_rendezvous *) xprt->xp_p1;
 262 again:
 263   len = sizeof (struct sockaddr_in);
 264   if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0)
 265     {
 266       if (errno == EINTR)
 267         goto again;
 268       return FALSE;
 269     }
 270   /*
 271    * make a new transporter (re-uses xprt)
 272    */
 273   xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
 274   memcpy (&xprt->xp_raddr, &addr, sizeof (addr));
 275   xprt->xp_addrlen = len;
 276   return FALSE;         /* there is never an rpc msg to be processed */
 277 }
 278
 279 static enum xprt_stat
 280 rendezvous_stat (SVCXPRT *xprt attribute_unused)
 281 {
 282   return XPRT_IDLE;
 283 }
 284
 285 static void
 286 svctcp_destroy (SVCXPRT *xprt)
 287 {
 288   struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1;
 289
 290   xprt_unregister (xprt);
 291   (void) close (xprt->xp_sock);
 292   if (xprt->xp_port != 0)
 293     {
 294       /* a rendezvouser socket */
 295       xprt->xp_port = 0;
 296     }
 297   else
 298     {
 299       /* an actual connection socket */
 300       XDR_DESTROY (&(cd->xdrs));
 301     }
 302   mem_free ((caddr_t) cd, sizeof (struct tcp_conn));
 303   mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
 304 }
 305
 306
 307 /*
 308  * reads data from the tcp connection.
 309  * any error is fatal and the connection is closed.
 310  * (And a read of zero bytes is a half closed stream => error.)
 311  */
 312 static int
 313 readtcp (char *xprtptr, char *buf, int len)
 314 {
 315   SVCXPRT *xprt = (SVCXPRT *)xprtptr;
 316   int sock = xprt->xp_sock;
 317   int milliseconds = 35 * 1000;
 318   struct pollfd pollfd;
 319
 320   do
 321     {
 322       pollfd.fd = sock;
 323       pollfd.events = POLLIN;
 324       switch (poll (&pollfd, 1, milliseconds))
 325         {
 326         case -1:
 327           if (errno == EINTR)
 328             continue;
 329           /*FALLTHROUGH*/
 330         case 0:
 331           goto fatal_err;
 332         default:
 333           if ((pollfd.revents & POLLERR) || (pollfd.revents & POLLHUP)
 334               || (pollfd.revents & POLLNVAL))
 335             goto fatal_err;
 336           break;
 337         }
 338     }
 339   while ((pollfd.revents & POLLIN) == 0);
 340
 341   if ((len = read (sock, buf, len)) > 0)
 342     return len;
 343
 344  fatal_err:
 345   ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
 346   return -1;
 347 }
 348
 349 /*
 350  * writes data to the tcp connection.
 351  * Any error is fatal and the connection is closed.
 352  */
 353 static int
 354 writetcp (char *xprtptr, char * buf, int len)
 355 {
 356   SVCXPRT *xprt = (SVCXPRT *)xprtptr;
 357   int i, cnt;
 358
 359   for (cnt = len; cnt > 0; cnt -= i, buf += i)
 360     {
 361       if ((i = write (xprt->xp_sock, buf, cnt)) < 0)
 362         {
 363           ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
 364           return -1;
 365         }
 366     }
 367   return len;
 368 }
 369
 370 static enum xprt_stat
 371 svctcp_stat (SVCXPRT *xprt)
 372 {
 373   struct tcp_conn *cd =
 374   (struct tcp_conn *) (xprt->xp_p1);
 375
 376   if (cd->strm_stat == XPRT_DIED)
 377     return XPRT_DIED;
 378   if (!xdrrec_eof (&(cd->xdrs)))
 379     return XPRT_MOREREQS;
 380   return XPRT_IDLE;
 381 }
 382
 383 static bool_t
 384 svctcp_recv (SVCXPRT *xprt, struct rpc_msg *msg)
 385 {
 386   struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
 387   XDR *xdrs = &(cd->xdrs);
 388
 389   xdrs->x_op = XDR_DECODE;
 390   (void) xdrrec_skiprecord (xdrs);
 391   if (xdr_callmsg (xdrs, msg))
 392     {
 393       cd->x_id = msg->rm_xid;
 394       return TRUE;
 395     }
 396   cd->strm_stat = XPRT_DIED;    /* XXXX */
 397   return FALSE;
 398 }
 399
 400 static bool_t
 401 svctcp_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 402 {
 403   return ((*xdr_args) (&(((struct tcp_conn *)
 404                           (xprt->xp_p1))->xdrs), args_ptr));
 405 }
 406
 407 static bool_t
 408 svctcp_freeargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
 409 {
 410   XDR *xdrs = &(((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 (SVCXPRT *xprt, struct rpc_msg *msg)
 418 {
 419   struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1);
 420   XDR *xdrs = &(cd->xdrs);
 421   bool_t stat;
 422
 423   xdrs->x_op = XDR_ENCODE;
 424   msg->rm_xid = cd->x_id;
 425   stat = xdr_replymsg (xdrs, msg);
 426   (void) xdrrec_endofrecord (xdrs, TRUE);
 427   return stat;
 428 }