crypto/openssl-0.9.7d/crypto/bio/bss_rtcp.c

   1 /* crypto/bio/bss_rtcp.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 /* Written by David L. Jones <jonesd@kcgl1.eng.ohio-state.edu>
  60  * Date:   22-JUL-1996
  61  * Revised: 25-SEP-1997         Update for 0.8.1, BIO_CTRL_SET -> BIO_C_SET_FD
  62  */
  63 /* VMS */
  64 #include <stdio.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <errno.h>
  68 #include "cryptlib.h"
  69 #include <openssl/bio.h>
  70
  71 #include <iodef.h>              /* VMS IO$_ definitions */
  72 #include <starlet.h>
  73
  74 typedef unsigned short io_channel;
  75 /*************************************************************************/
  76 struct io_status { short status, count; long flags; };
  77
  78 struct rpc_msg {                /* Should have member alignment inhibited */
  79    char channel;                /* 'A'-app data. 'R'-remote client 'G'-global */
  80    char function;               /* 'G'-get, 'P'-put, 'C'-confirm, 'X'-close */
  81    unsigned short int length;   /* Amount of data returned or max to return */
  82    char data[4092];             /* variable data */
  83 };
  84 #define RPC_HDR_SIZE (sizeof(struct rpc_msg) - 4092)
  85
  86 struct rpc_ctx {
  87     int filled, pos;
  88     struct rpc_msg msg;
  89 };
  90
  91 static int rtcp_write(BIO *h,const char *buf,int num);
  92 static int rtcp_read(BIO *h,char *buf,int size);
  93 static int rtcp_puts(BIO *h,const char *str);
  94 static int rtcp_gets(BIO *h,char *str,int size);
  95 static long rtcp_ctrl(BIO *h,int cmd,long arg1,void *arg2);
  96 static int rtcp_new(BIO *h);
  97 static int rtcp_free(BIO *data);
  98
  99 static BIO_METHOD rtcp_method=
 100         {
 101         BIO_TYPE_FD,
 102         "RTCP",
 103         rtcp_write,
 104         rtcp_read,
 105         rtcp_puts,
 106         rtcp_gets,
 107         rtcp_ctrl,
 108         rtcp_new,
 109         rtcp_free,
 110         NULL,
 111         };
 112
 113 BIO_METHOD *BIO_s_rtcp(void)
 114         {
 115         return(&rtcp_method);
 116         }
 117 /*****************************************************************************/
 118 /* Decnet I/O routines.
 119  */
 120
 121 #ifdef __DECC
 122 #pragma message save
 123 #pragma message disable DOLLARID
 124 #endif
 125
 126 static int get ( io_channel chan, char *buffer, int maxlen, int *length )
 127 {
 128     int status;
 129     struct io_status iosb;
 130     status = sys$qiow ( 0, chan, IO$_READVBLK, &iosb, 0, 0,
 131         buffer, maxlen, 0, 0, 0, 0 );
 132     if ( (status&1) == 1 ) status = iosb.status;
 133     if ( (status&1) == 1 ) *length = iosb.count;
 134     return status;
 135 }
 136
 137 static int put ( io_channel chan, char *buffer, int length )
 138 {
 139     int status;
 140     struct io_status iosb;
 141     status = sys$qiow ( 0, chan, IO$_WRITEVBLK, &iosb, 0, 0,
 142         buffer, length, 0, 0, 0, 0 );
 143     if ( (status&1) == 1 ) status = iosb.status;
 144     return status;
 145 }
 146
 147 #ifdef __DECC
 148 #pragma message restore
 149 #endif
 150
 151 /***************************************************************************/
 152
 153 static int rtcp_new(BIO *bi)
 154 {
 155     struct rpc_ctx *ctx;
 156         bi->init=1;
 157         bi->num=0;
 158         bi->flags = 0;
 159         bi->ptr=OPENSSL_malloc(sizeof(struct rpc_ctx));
 160         ctx = (struct rpc_ctx *) bi->ptr;
 161         ctx->filled = 0;
 162         ctx->pos = 0;
 163         return(1);
 164 }
 165
 166 static int rtcp_free(BIO *a)
 167 {
 168         if (a == NULL) return(0);
 169         if ( a->ptr ) OPENSSL_free ( a->ptr );
 170         a->ptr = NULL;
 171         return(1);
 172 }
 173
 174 static int rtcp_read(BIO *b, char *out, int outl)
 175 {
 176     int status, length;
 177     struct rpc_ctx *ctx;
 178     /*
 179      * read data, return existing.
 180      */
 181     ctx = (struct rpc_ctx *) b->ptr;
 182     if ( ctx->pos < ctx->filled ) {
 183         length = ctx->filled - ctx->pos;
 184         if ( length > outl ) length = outl;
 185         memmove ( out, &ctx->msg.data[ctx->pos], length );
 186         ctx->pos += length;
 187         return length;
 188     }
 189     /*
 190      * Requst more data from R channel.
 191      */
 192     ctx->msg.channel = 'R';
 193     ctx->msg.function = 'G';
 194     ctx->msg.length = sizeof(ctx->msg.data);
 195     status = put ( b->num, (char *) &ctx->msg, RPC_HDR_SIZE );
 196     if ( (status&1) == 0 ) {
 197         return -1;
 198     }
 199     /*
 200      * Read.
 201      */
 202     ctx->pos = ctx->filled = 0;
 203     status = get ( b->num, (char *) &ctx->msg, sizeof(ctx->msg), &length );
 204     if ( (status&1) == 0 ) length = -1;
 205     if ( ctx->msg.channel != 'R' || ctx->msg.function != 'C' ) {
 206         length = -1;
 207     }
 208     ctx->filled = length - RPC_HDR_SIZE;
 209
 210     if ( ctx->pos < ctx->filled ) {
 211         length = ctx->filled - ctx->pos;
 212         if ( length > outl ) length = outl;
 213         memmove ( out, ctx->msg.data, length );
 214         ctx->pos += length;
 215         return length;
 216     }
 217
 218     return length;
 219 }
 220
 221 static int rtcp_write(BIO *b, const char *in, int inl)
 222 {
 223     int status, i, segment, length;
 224     struct rpc_ctx *ctx;
 225     /*
 226      * Output data, send in chunks no larger that sizeof(ctx->msg.data).
 227      */
 228     ctx = (struct rpc_ctx *) b->ptr;
 229     for ( i = 0; i < inl; i += segment ) {
 230         segment = inl - i;
 231         if ( segment > sizeof(ctx->msg.data) ) segment = sizeof(ctx->msg.data);
 232         ctx->msg.channel = 'R';
 233         ctx->msg.function = 'P';
 234         ctx->msg.length = segment;
 235         memmove ( ctx->msg.data, &in[i], segment );
 236         status = put ( b->num, (char *) &ctx->msg, segment + RPC_HDR_SIZE );
 237         if ((status&1) == 0 ) { i = -1; break; }
 238
 239         status = get ( b->num, (char *) &ctx->msg, sizeof(ctx->msg), &length );
 240         if ( ((status&1) == 0) || (length < RPC_HDR_SIZE) ) { i = -1; break; }
 241         if ( (ctx->msg.channel != 'R') || (ctx->msg.function != 'C') ) {
 242            printf("unexpected response when confirming put %c %c\n",
 243                 ctx->msg.channel, ctx->msg.function );
 244
 245         }
 246     }
 247     return(i);
 248 }
 249
 250 static long rtcp_ctrl(BIO *b, int cmd, long num, void *ptr)
 251         {
 252         long ret=1;
 253
 254         switch (cmd)
 255                 {
 256         case BIO_CTRL_RESET:
 257         case BIO_CTRL_EOF:
 258                 ret = 1;
 259                 break;
 260         case BIO_C_SET_FD:
 261                 b->num = num;
 262                 ret = 1;
 263                 break;
 264         case BIO_CTRL_SET_CLOSE:
 265         case BIO_CTRL_FLUSH:
 266         case BIO_CTRL_DUP:
 267                 ret=1;
 268                 break;
 269         case BIO_CTRL_GET_CLOSE:
 270         case BIO_CTRL_INFO:
 271         case BIO_CTRL_GET:
 272         case BIO_CTRL_PENDING:
 273         case BIO_CTRL_WPENDING:
 274         default:
 275                 ret=0;
 276                 break;
 277                 }
 278         return(ret);
 279         }
 280
 281 static int rtcp_gets(BIO *bp, char *buf, int size)
 282         {
 283         return(0);
 284         }
 285
 286 static int rtcp_puts(BIO *bp, const char *str)
 287 {
 288     int length;
 289     if (str == NULL) return(0);
 290     length = strlen ( str );
 291     if ( length == 0 ) return (0);
 292     return rtcp_write ( bp,str, length );
 293 }
 294