usr/src/lib/libc/port/nsl/_conn_util.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  24 /*        All Rights Reserved   */
  25
  26 /*
  27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 #include "mt.h"
  34 #include <sys/param.h>
  35 #include <sys/types.h>
  36 #include <errno.h>
  37 #include <string.h>
  38 #include <stdlib.h>
  39 #include <stropts.h>
  40 #include <sys/stream.h>
  41 #define _SUN_TPI_VERSION 2
  42 #include <sys/tihdr.h>
  43 #include <sys/timod.h>
  44 #include <xti.h>
  45 #include <signal.h>
  46 #include <assert.h>
  47 #include "tx.h"
  48
  49
  50 /*
  51  * Snd_conn_req - send connect request message to transport provider.
  52  * All signals for the caller are blocked during the call to simplify design.
  53  * (This is OK for a bounded amount of time this routine is expected to
  54  * execute).  Also, assumes tiptr->ti_lock is held.
  55  */
  56 int
  57 _t_snd_conn_req(
  58         struct _ti_user *tiptr,
  59         const struct t_call *call,
  60         struct strbuf *ctlbufp)
  61 {
  62         struct T_conn_req *creq;
  63         int size;
  64         int fd;
  65
  66         assert(MUTEX_HELD(&tiptr->ti_lock));
  67         fd = tiptr->ti_fd;
  68
  69         if (tiptr->ti_servtype == T_CLTS) {
  70                 t_errno = TNOTSUPPORT;
  71                 return (-1);
  72         }
  73
  74         if (_t_is_event(fd, tiptr) < 0)
  75                 return (-1);
  76
  77         /* LINTED pointer cast */
  78         creq = (struct T_conn_req *)ctlbufp->buf;
  79         creq->PRIM_type = T_CONN_REQ;
  80         creq->DEST_length = call->addr.len;
  81         creq->DEST_offset = 0;
  82         creq->OPT_length = call->opt.len;
  83         creq->OPT_offset = 0;
  84         size = (int)sizeof (struct T_conn_req); /* size without any buffers */
  85
  86         if (call->addr.len) {
  87                 if (_t_aligned_copy(ctlbufp, call->addr.len, size,
  88                     call->addr.buf, &creq->DEST_offset) < 0) {
  89                         /*
  90                          * Aligned copy will overflow buffer allocated based
  91                          * based on transport maximum address size.
  92                          * return error.
  93                          */
  94                         t_errno = TBADADDR;
  95                         return (-1);
  96                 }
  97                 size = creq->DEST_offset + creq->DEST_length;
  98         }
  99         if (call->opt.len) {
 100                 if (_t_aligned_copy(ctlbufp, call->opt.len, size,
 101                     call->opt.buf, &creq->OPT_offset) < 0) {
 102                         /*
 103                          * Aligned copy will overflow buffer allocated based
 104                          * on maximum option size in transport.
 105                          * return error.
 106                          */
 107                         t_errno = TBADOPT;
 108                         return (-1);
 109                 }
 110                 size = creq->OPT_offset + creq->OPT_length;
 111         }
 112         if (call->udata.len) {
 113                 if ((tiptr->ti_cdatasize == T_INVALID /* -2 */) ||
 114                     ((tiptr->ti_cdatasize != T_INFINITE /* -1 */) &&
 115                         (call->udata.len > (uint32_t)tiptr->ti_cdatasize))) {
 116                         /*
 117                          * user data not valid with connect or it
 118                          * exceeds the limits specified by the transport
 119                          * provider.
 120                          */
 121                         t_errno = TBADDATA;
 122                         return (-1);
 123                 }
 124         }
 125
 126         ctlbufp->len = size;
 127
 128         /*
 129          * Assumes signals are blocked so putmsg() will not block
 130          * indefinitely
 131          */
 132         if (putmsg(fd, ctlbufp,
 133             (struct strbuf *)(call->udata.len? &call->udata: NULL), 0) < 0) {
 134                 t_errno = TSYSERR;
 135                 return (-1);
 136         }
 137
 138         if (_t_is_ok(fd, tiptr, T_CONN_REQ) < 0)
 139                 return (-1);
 140         return (0);
 141 }
 142
 143
 144
 145 /*
 146  * Rcv_conn_con - get connection confirmation off
 147  * of read queue
 148  * Note:
 149  *      - called holding the tiptr->ti_lock
 150  */
 151 int
 152 _t_rcv_conn_con(
 153         struct _ti_user *tiptr,
 154         struct t_call *call,
 155         struct strbuf *ctlbufp,
 156         int api_semantics)
 157 {
 158         struct strbuf databuf;
 159         union T_primitives *pptr;
 160         int retval, fd, sv_errno;
 161         int didralloc;
 162
 163         int flg = 0;
 164
 165         fd = tiptr->ti_fd;
 166
 167         if (tiptr->ti_servtype == T_CLTS) {
 168                 t_errno = TNOTSUPPORT;
 169                 return (-1);
 170         }
 171
 172         /*
 173          * see if there is something in look buffer
 174          */
 175         if (tiptr->ti_lookcnt > 0) {
 176                 t_errno = TLOOK;
 177                 return (-1);
 178         }
 179
 180         ctlbufp->len = 0;
 181         /*
 182          * Acquire databuf for use in sending/receiving data part
 183          */
 184         if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0)
 185                 return (-1);
 186
 187         /*
 188          * This is a call that may block indefinitely so we drop the
 189          * lock and allow signals in MT case here and reacquire it.
 190          * Error case should roll back state changes done above
 191          * (happens to be no state change here)
 192          */
 193         sig_mutex_unlock(&tiptr->ti_lock);
 194         if ((retval = getmsg(fd, ctlbufp, &databuf, &flg)) < 0) {
 195                 sv_errno = errno;
 196                 if (errno == EAGAIN)
 197                         t_errno = TNODATA;
 198                 else
 199                         t_errno = TSYSERR;
 200                 sig_mutex_lock(&tiptr->ti_lock);
 201                 errno = sv_errno;
 202                 goto err_out;
 203         }
 204         sig_mutex_lock(&tiptr->ti_lock);
 205
 206         if (databuf.len == -1) databuf.len = 0;
 207
 208         /*
 209          * did we get entire message
 210          */
 211         if (retval > 0) {
 212                 t_errno = TSYSERR;
 213                 errno = EIO;
 214                 goto err_out;
 215         }
 216
 217         /*
 218          * is cntl part large enough to determine message type?
 219          */
 220         if (ctlbufp->len < (int)sizeof (t_scalar_t)) {
 221                 t_errno = TSYSERR;
 222                 errno = EPROTO;
 223                 goto err_out;
 224         }
 225
 226         /* LINTED pointer cast */
 227         pptr = (union T_primitives *)ctlbufp->buf;
 228
 229         switch (pptr->type) {
 230
 231         case T_CONN_CON:
 232
 233                 if ((ctlbufp->len < (int)sizeof (struct T_conn_con)) ||
 234                     (pptr->conn_con.OPT_length != 0 &&
 235                     (ctlbufp->len < (int)(pptr->conn_con.OPT_length +
 236                     pptr->conn_con.OPT_offset)))) {
 237                         t_errno = TSYSERR;
 238                         errno = EPROTO;
 239                         goto err_out;
 240                 }
 241
 242                 if (call != NULL) {
 243                         /*
 244                          * Note: Buffer overflow is an error in XTI
 245                          * only if netbuf.maxlen > 0
 246                          */
 247                         if (_T_IS_TLI(api_semantics) || call->addr.maxlen > 0) {
 248                                 if (TLEN_GT_NLEN(pptr->conn_con.RES_length,
 249                                     call->addr.maxlen)) {
 250                                         t_errno = TBUFOVFLW;
 251                                         goto err_out;
 252                                 }
 253                                 (void) memcpy(call->addr.buf,
 254                                     ctlbufp->buf + pptr->conn_con.RES_offset,
 255                                     (size_t)pptr->conn_con.RES_length);
 256                                 call->addr.len = pptr->conn_con.RES_length;
 257                         }
 258                         if (_T_IS_TLI(api_semantics) || call->opt.maxlen > 0) {
 259                                 if (TLEN_GT_NLEN(pptr->conn_con.OPT_length,
 260                                     call->opt.maxlen)) {
 261                                         t_errno = TBUFOVFLW;
 262                                         goto err_out;
 263                                 }
 264                                 (void) memcpy(call->opt.buf,
 265                                     ctlbufp->buf + pptr->conn_con.OPT_offset,
 266                                     (size_t)pptr->conn_con.OPT_length);
 267                                 call->opt.len = pptr->conn_con.OPT_length;
 268                         }
 269                         if (_T_IS_TLI(api_semantics) ||
 270                             call->udata.maxlen > 0) {
 271                                 if (databuf.len > (int)call->udata.maxlen) {
 272                                         t_errno = TBUFOVFLW;
 273                                         goto err_out;
 274                                 }
 275                                 (void) memcpy(call->udata.buf, databuf.buf,
 276                                     (size_t)databuf.len);
 277                                 call->udata.len = databuf.len;
 278                         }
 279                         /*
 280                          * since a confirmation seq number
 281                          * is -1 by default
 282                          */
 283                         call->sequence = (int)-1;
 284                 }
 285                 if (didralloc)
 286                         free(databuf.buf);
 287                 else
 288                         tiptr->ti_rcvbuf = databuf.buf;
 289                 return (0);
 290
 291         case T_DISCON_IND:
 292
 293                 /*
 294                  * if disconnect indication then append it to
 295                  * the "look bufffer" list.
 296                  * This may result in MT case for the process
 297                  * signal mask to be temporarily masked to
 298                  * ensure safe memory allocation.
 299                  */
 300
 301                 if (_t_register_lookevent(tiptr, databuf.buf, databuf.len,
 302                                         ctlbufp->buf, ctlbufp->len) < 0) {
 303                         t_errno = TSYSERR;
 304                         errno = ENOMEM;
 305                         goto err_out;
 306                 }
 307                 t_errno = TLOOK;
 308                 goto err_out;
 309
 310         default:
 311                 break;
 312         }
 313
 314         t_errno = TSYSERR;
 315         errno = EPROTO;
 316 err_out:
 317         if (didralloc)
 318                 free(databuf.buf);
 319         else
 320                 tiptr->ti_rcvbuf = databuf.buf;
 321         return (-1);
 322 }