rpc.subproj/svc_tcp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)svc_tcp.c    2.2 88/08/01 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: svc_tcp.c,v 1.6 2004/06/11 16:28:07 majka Exp $";
  57 #endif
  58
  59 /*
  60  * svc_tcp.c, Server side for TCP/IP based RPC.
  61  *
  62  * Copyright (C) 1984, Sun Microsystems, Inc.
  63  *
  64  * Actually implements two flavors of transporter -
  65  * a tcp rendezvouser (a listner and connection establisher)
  66  * and a record/tcp stream.
  67  */
  68
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <unistd.h>
  73 #include <rpc/rpc.h>
  74 #include <sys/socket.h>
  75 #include <errno.h>
  76
  77 #define max(a, b) (((a) > (b)) ? (a) : (b))
  78
  79 extern int              bindresvport();
  80
  81 /*
  82  * Ops vector for TCP/IP based rpc service handle
  83  */
  84 static bool_t           svctcp_recv();
  85 static enum xprt_stat   svctcp_stat();
  86 static bool_t           svctcp_getargs();
  87 static bool_t           svctcp_reply();
  88 static bool_t           svctcp_freeargs();
  89 static void             svctcp_destroy();
  90
  91 static struct xp_ops svctcp_op = {
  92         svctcp_recv,
  93         svctcp_stat,
  94         svctcp_getargs,
  95         svctcp_reply,
  96         svctcp_freeargs,
  97         svctcp_destroy
  98 };
  99
 100 /*
 101  * Ops vector for TCP/IP rendezvous handler
 102  */
 103 static bool_t           rendezvous_abort();
 104 static bool_t           rendezvous_request();
 105 static enum xprt_stat   rendezvous_stat();
 106
 107 static struct xp_ops svctcp_rendezvous_op = {
 108         rendezvous_request,
 109         rendezvous_stat,
 110         rendezvous_abort,
 111         rendezvous_abort,
 112         rendezvous_abort,
 113         svctcp_destroy
 114 };
 115
 116 static int readtcp(), writetcp();
 117 static SVCXPRT *makefd_xprt();
 118
 119 struct tcp_rendezvous { /* kept in xprt->xp_p1 */
 120         u_int sendsize;
 121         u_int recvsize;
 122 };
 123
 124 struct tcp_conn {  /* kept in xprt->xp_p1 */
 125         enum xprt_stat strm_stat;
 126 #ifdef __LP64__
 127         uint32_t x_id;
 128 #else
 129         u_long x_id;
 130 #endif
 131         XDR xdrs;
 132         char verf_body[MAX_AUTH_BYTES];
 133 };
 134
 135 /*
 136  * Usage:
 137  *      xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
 138  *
 139  * Creates, registers, and returns a (rpc) tcp based transporter.
 140  * Once *xprt is initialized, it is registered as a transporter
 141  * see (svc.h, xprt_register).  This routine returns
 142  * a NULL if a problem occurred.
 143  *
 144  * If sock<0 then a socket is created, else sock is used.
 145  * If the socket, sock is not bound to a port then svctcp_create
 146  * binds it to an arbitrary port.  The routine then starts a tcp
 147  * listener on the socket's associated port.  In any (successful) case,
 148  * xprt->xp_sock is the registered socket number and xprt->xp_port is the
 149  * associated port number.
 150  *
 151  * Since tcp streams do buffered io similar to stdio, the caller can specify
 152  * how big the send and receive buffers are via the second and third parms;
 153  * 0 => use the system default.
 154  */
 155 SVCXPRT *
 156 svctcp_create(sock, sendsize, recvsize)
 157         register int sock;
 158         u_int sendsize;
 159         u_int recvsize;
 160 {
 161         bool_t madesock = FALSE;
 162         register SVCXPRT *xprt;
 163         register struct tcp_rendezvous *r;
 164         struct sockaddr_in addr;
 165         unsigned int len = sizeof(struct sockaddr_in);
 166
 167         if (sock == RPC_ANYSOCK) {
 168                 if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
 169                         perror("svctcp_.c - udp socket creation problem");
 170                         return ((SVCXPRT *)NULL);
 171                 }
 172                 madesock = TRUE;
 173         }
 174         bzero((char *)&addr, sizeof (addr));
 175         addr.sin_family = AF_INET;
 176         if (bindresvport(sock, &addr)) {
 177                 addr.sin_port = 0;
 178                 (void)bind(sock, (struct sockaddr *)&addr, len);
 179         }
 180         if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0)  ||
 181             (listen(sock, 2) != 0)) {
 182                 perror("svctcp_.c - cannot getsockname or listen");
 183                 if (madesock)
 184                        (void)close(sock);
 185                 return ((SVCXPRT *)NULL);
 186         }
 187         r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
 188         if (r == NULL) {
 189                 (void) fprintf(stderr, "svctcp_create: out of memory\n");
 190                 return (NULL);
 191         }
 192         r->sendsize = sendsize;
 193         r->recvsize = recvsize;
 194         xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
 195         if (xprt == NULL) {
 196                 mem_free(r, sizeof(*r));
 197                 (void) fprintf(stderr, "svctcp_create: out of memory\n");
 198                 return (NULL);
 199         }
 200         xprt->xp_p2 = NULL;
 201         xprt->xp_p1 = (caddr_t)r;
 202         xprt->xp_verf = _null_auth;
 203         xprt->xp_ops = &svctcp_rendezvous_op;
 204         xprt->xp_port = ntohs(addr.sin_port);
 205         xprt->xp_sock = sock;
 206         xprt_register(xprt);
 207         return (xprt);
 208 }
 209
 210 /*
 211  * Like svtcp_create(), except the routine takes any *open* UNIX file
 212  * descriptor as its first input.
 213  */
 214 SVCXPRT *
 215 svcfd_create(fd, sendsize, recvsize)
 216         int fd;
 217         u_int sendsize;
 218         u_int recvsize;
 219 {
 220
 221         return (makefd_xprt(fd, sendsize, recvsize));
 222 }
 223
 224 static SVCXPRT *
 225 makefd_xprt(fd, sendsize, recvsize)
 226         int fd;
 227         u_int sendsize;
 228         u_int recvsize;
 229 {
 230         register SVCXPRT *xprt;
 231         register struct tcp_conn *cd;
 232
 233         xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
 234         if (xprt == (SVCXPRT *)NULL) {
 235                 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
 236                 goto done;
 237         }
 238         cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
 239         if (cd == (struct tcp_conn *)NULL) {
 240                 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
 241                 mem_free((char *) xprt, sizeof(SVCXPRT));
 242                 xprt = (SVCXPRT *)NULL;
 243                 goto done;
 244         }
 245         cd->strm_stat = XPRT_IDLE;
 246         xdrrec_create(&(cd->xdrs), sendsize, recvsize,
 247             (caddr_t)xprt, readtcp, writetcp);
 248         xprt->xp_p2 = NULL;
 249         xprt->xp_p1 = (caddr_t)cd;
 250         xprt->xp_verf.oa_base = cd->verf_body;
 251         xprt->xp_addrlen = 0;
 252         xprt->xp_ops = &svctcp_op;  /* truely deals with calls */
 253         xprt->xp_port = 0;  /* this is a connection, not a rendezvouser */
 254         xprt->xp_sock = fd;
 255         xprt_register(xprt);
 256     done:
 257         return (xprt);
 258 }
 259
 260 static bool_t
 261 rendezvous_abort()
 262 {
 263         abort();
 264         return (FALSE);
 265 }
 266
 267 static bool_t
 268 rendezvous_request(xprt)
 269         register SVCXPRT *xprt;
 270 {
 271         int sock;
 272         struct tcp_rendezvous *r;
 273         struct sockaddr_in addr;
 274         unsigned int len;
 275
 276         r = (struct tcp_rendezvous *)xprt->xp_p1;
 277     again:
 278         len = sizeof(struct sockaddr_in);
 279         if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr, &len)) < 0) {
 280                 if (errno == EINTR)
 281                         goto again;
 282                return (FALSE);
 283         }
 284         /*
 285          * make a new transporter (re-uses xprt)
 286          */
 287         xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
 288         xprt->xp_raddr = addr;
 289         xprt->xp_addrlen = len;
 290         return (FALSE); /* there is never an rpc msg to be processed */
 291 }
 292
 293 static enum xprt_stat
 294 rendezvous_stat()
 295 {
 296
 297         return (XPRT_IDLE);
 298 }
 299
 300 static void
 301 svctcp_destroy(xprt)
 302         register SVCXPRT *xprt;
 303 {
 304         register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
 305
 306         xprt_unregister(xprt);
 307         (void)close(xprt->xp_sock);
 308         if (xprt->xp_port != 0) {
 309                 /* a rendezvouser socket */
 310                 xprt->xp_port = 0;
 311         } else {
 312                 /* an actual connection socket */
 313                 XDR_DESTROY(&(cd->xdrs));
 314         }
 315         mem_free((caddr_t)cd, sizeof(struct tcp_conn));
 316         mem_free((caddr_t)xprt, sizeof(SVCXPRT));
 317 }
 318
 319 /*
 320  * All read operations timeout after 35 seconds.
 321  * A timeout is fatal for the connection.
 322  */
 323 static struct timeval wait_per_try = { 35, 0 };
 324
 325 extern int svc_maxfd;
 326
 327 /*
 328  * reads data from the tcp conection.
 329  * any error is fatal and the connection is closed.
 330  * (And a read of zero bytes is a half closed stream => error.)
 331  */
 332 static int
 333 readtcp(xprt, buf, len)
 334         register SVCXPRT *xprt;
 335         caddr_t buf;
 336         register int len;
 337 {
 338         register int sock = xprt->xp_sock;
 339         fd_set readfds;
 340         bool_t ready = FALSE;
 341
 342         do
 343         {
 344                 FD_COPY(&svc_fdset, &readfds);
 345                 FD_SET(sock, &readfds);
 346                 if (select(max(svc_maxfd, sock) + 1, &readfds, NULL, NULL, &wait_per_try) <= 0)
 347                 {
 348                         if (errno == EINTR) continue;
 349                         goto fatal_err;
 350                 }
 351                 else if (FD_ISSET(sock, &readfds))
 352                 {
 353                         ready = TRUE;
 354                 }
 355         } while (!ready);
 356
 357         if ((len = read(sock, buf, len)) > 0) return len;
 358
 359 fatal_err:
 360         ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
 361         return -1;
 362 }
 363
 364 /*
 365  * writes data to the tcp connection.
 366  * Any error is fatal and the connection is closed.
 367  */
 368 static int
 369 writetcp(xprt, buf, len)
 370         register SVCXPRT *xprt;
 371         caddr_t buf;
 372         int len;
 373 {
 374         register int i, cnt;
 375
 376         for (cnt = len; cnt > 0; cnt -= i, buf += i) {
 377                 if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
 378                         ((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
 379                             XPRT_DIED;
 380                         return (-1);
 381                 }
 382         }
 383         return (len);
 384 }
 385
 386 static enum xprt_stat
 387 svctcp_stat(xprt)
 388         SVCXPRT *xprt;
 389 {
 390         register struct tcp_conn *cd =
 391             (struct tcp_conn *)(xprt->xp_p1);
 392
 393         if (cd->strm_stat == XPRT_DIED)
 394                 return (XPRT_DIED);
 395         if (! xdrrec_eof(&(cd->xdrs)))
 396                 return (XPRT_MOREREQS);
 397         return (XPRT_IDLE);
 398 }
 399
 400 static bool_t
 401 svctcp_recv(xprt, msg)
 402         SVCXPRT *xprt;
 403         register struct rpc_msg *msg;
 404 {
 405         register struct tcp_conn *cd =
 406             (struct tcp_conn *)(xprt->xp_p1);
 407         register XDR *xdrs = &(cd->xdrs);
 408
 409         xdrs->x_op = XDR_DECODE;
 410         (void)xdrrec_skiprecord(xdrs);
 411         if (xdr_callmsg(xdrs, msg)) {
 412                 cd->x_id = msg->rm_xid;
 413                 return (TRUE);
 414         }
 415         return (FALSE);
 416 }
 417
 418 static bool_t
 419 svctcp_getargs(xprt, xdr_args, args_ptr)
 420         SVCXPRT *xprt;
 421         xdrproc_t xdr_args;
 422         caddr_t args_ptr;
 423 {
 424
 425         return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr, 0));
 426 }
 427
 428 static bool_t
 429 svctcp_freeargs(xprt, xdr_args, args_ptr)
 430         SVCXPRT *xprt;
 431         xdrproc_t xdr_args;
 432         caddr_t args_ptr;
 433 {
 434         register XDR *xdrs =
 435             &(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
 436
 437         xdrs->x_op = XDR_FREE;
 438         return ((*xdr_args)(xdrs, args_ptr, 0));
 439 }
 440
 441 static bool_t
 442 svctcp_reply(xprt, msg)
 443         SVCXPRT *xprt;
 444         register struct rpc_msg *msg;
 445 {
 446         register struct tcp_conn *cd =
 447             (struct tcp_conn *)(xprt->xp_p1);
 448         register XDR *xdrs = &(cd->xdrs);
 449         register bool_t stat;
 450
 451         xdrs->x_op = XDR_ENCODE;
 452         msg->rm_xid = cd->x_id;
 453         stat = xdr_replymsg(xdrs, msg);
 454         (void)xdrrec_endofrecord(xdrs, TRUE);
 455         return (stat);
 456 }