mDNSShared/dnssd_ipc.c

   1 /* -*- Mode: C; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright notice,
   9  *     this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright notice,
  11  *     this list of conditions and the following disclaimer in the documentation
  12  *     and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of its
  14  *     contributors may be used to endorse or promote products derived from this
  15  *     software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27
  28         Change History (most recent first):
  29
  30 $Log: dnssd_ipc.c,v $
  31 Revision 1.23  2009/04/01 21:10:34  herscher
  32 <rdar://problem/5925472> Current Bonjour code does not compile on Windows
  33
  34 Revision 1.22  2009/02/12 20:28:31  cheshire
  35 Added some missing "const" declarations
  36
  37 Revision 1.21  2008/10/23 23:21:31  cheshire
  38 Moved definition of dnssd_strerror() to be with the definition of dnssd_errno, in dnssd_ipc.h
  39
  40 Revision 1.20  2007/07/23 22:12:53  cheshire
  41 <rdar://problem/5352299> Make mDNSResponder more defensive against malicious local clients
  42
  43 Revision 1.19  2007/05/16 01:06:52  cheshire
  44 <rdar://problem/4471320> Improve reliability of kDNSServiceFlagsMoreComing flag on multiprocessor machines
  45
  46 Revision 1.18  2007/03/21 19:01:57  cheshire
  47 <rdar://problem/5078494> IPC code not 64-bit-savvy: assumes long=32bits, and short=16bits
  48
  49 Revision 1.17  2006/10/27 00:38:22  cheshire
  50 Strip accidental trailing whitespace from lines
  51
  52 Revision 1.16  2006/08/14 23:05:53  cheshire
  53 Added "tab-width" emacs header line
  54
  55 Revision 1.15  2005/01/27 22:57:56  cheshire
  56 Fix compile errors on gcc4
  57
  58 Revision 1.14  2004/10/06 02:22:20  cheshire
  59 Changed MacRoman copyright symbol (should have been UTF-8 in any case :-) to ASCII-compatible "(c)"
  60
  61 Revision 1.13  2004/10/01 22:15:55  rpantos
  62 rdar://problem/3824265: Replace APSL in client lib with BSD license.
  63
  64 Revision 1.12  2004/09/16 23:14:24  cheshire
  65 Changes for Windows compatibility
  66
  67 Revision 1.11  2004/06/18 04:56:09  rpantos
  68 casting goodness
  69
  70 Revision 1.10  2004/06/12 01:08:14  cheshire
  71 Changes for Windows compatibility
  72
  73 Revision 1.9  2004/05/18 23:51:27  cheshire
  74 Tidy up all checkin comments to use consistent "<rdar://problem/xxxxxxx>" format for bug numbers
  75
  76 Revision 1.8  2003/11/05 22:44:57  ksekar
  77 <rdar://problem/3335230>: No bounds checking when reading data from client
  78 Reviewed by: Stuart Cheshire
  79
  80 Revision 1.7  2003/08/12 19:56:25  cheshire
  81 Update to APSL 2.0
  82
  83  */
  84
  85 #include "dnssd_ipc.h"
  86
  87 #if defined(_WIN32)
  88
  89 char *win32_strerror(int inErrorCode)
  90         {
  91         static char buffer[1024];
  92         DWORD       n;
  93         memset(buffer, 0, sizeof(buffer));
  94         n = FormatMessageA(
  95                         FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
  96                         NULL,
  97                         (DWORD) inErrorCode,
  98                         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  99                         buffer,
 100                         sizeof(buffer),
 101                         NULL);
 102         if (n > 0)
 103                 {
 104                 // Remove any trailing CR's or LF's since some messages have them.
 105                 while ((n > 0) && isspace(((unsigned char *) buffer)[n - 1]))
 106                         buffer[--n] = '\0';
 107                 }
 108         return buffer;
 109         }
 110
 111 #endif
 112
 113 void put_uint32(const uint32_t l, char **ptr)
 114         {
 115         (*ptr)[0] = (char)((l >> 24) &  0xFF);
 116         (*ptr)[1] = (char)((l >> 16) &  0xFF);
 117         (*ptr)[2] = (char)((l >>  8) &  0xFF);
 118         (*ptr)[3] = (char)((l      ) &  0xFF);
 119         *ptr += sizeof(uint32_t);
 120         }
 121
 122 uint32_t get_uint32(const char **ptr, const char *end)
 123         {
 124         if (!*ptr || *ptr + sizeof(uint32_t) > end)
 125                 {
 126                 *ptr = NULL;
 127                 return(0);
 128                 }
 129         else
 130                 {
 131                 uint8_t *p = (uint8_t*) *ptr;
 132                 *ptr += sizeof(uint32_t);
 133                 return((uint32_t) ((uint32_t)p[0] << 24 | (uint32_t)p[1] << 16 | (uint32_t)p[2] << 8 | p[3]));
 134                 }
 135         }
 136
 137 void put_uint16(uint16_t s, char **ptr)
 138         {
 139         (*ptr)[0] = (char)((s >>  8) &  0xFF);
 140         (*ptr)[1] = (char)((s      ) &  0xFF);
 141         *ptr += sizeof(uint16_t);
 142         }
 143
 144 uint16_t get_uint16(const char **ptr, const char *end)
 145         {
 146         if (!*ptr || *ptr + sizeof(uint16_t) > end)
 147                 {
 148                 *ptr = NULL;
 149                 return(0);
 150                 }
 151         else
 152                 {
 153                 uint8_t *p = (uint8_t*) *ptr;
 154                 *ptr += sizeof(uint16_t);
 155                 return((uint16_t) ((uint16_t)p[0] << 8 | p[1]));
 156                 }
 157         }
 158
 159 int put_string(const char *str, char **ptr)
 160         {
 161         if (!str) str = "";
 162         strcpy(*ptr, str);
 163         *ptr += strlen(str) + 1;
 164         return 0;
 165         }
 166
 167 int get_string(const char **ptr, const char *const end, char *buffer, int buflen)
 168         {
 169         if (!*ptr)
 170                 {
 171                 *buffer = 0;
 172                 return(-1);
 173                 }
 174         else
 175                 {
 176                 char *lim = buffer + buflen;    // Calculate limit
 177                 while (*ptr < end && buffer < lim)
 178                         {
 179                         char c = *buffer++ = *(*ptr)++;
 180                         if (c == 0) return(0);          // Success
 181                         }
 182                 if (buffer == lim) buffer--;
 183                 *buffer = 0;                                    // Failed, so terminate string,
 184                 *ptr = NULL;                                    // clear pointer,
 185                 return(-1);                                             // and return failure indication
 186                 }
 187         }
 188
 189 void put_rdata(const int rdlen, const unsigned char *rdata, char **ptr)
 190         {
 191         memcpy(*ptr, rdata, rdlen);
 192         *ptr += rdlen;
 193         }
 194
 195 const char *get_rdata(const char **ptr, const char *end, int rdlen)
 196         {
 197         if (!*ptr || *ptr + rdlen > end)
 198                 {
 199                 *ptr = NULL;
 200                 return(0);
 201                 }
 202         else
 203                 {
 204                 const char *rd = *ptr;
 205                 *ptr += rdlen;
 206                 return rd;
 207                 }
 208         }
 209
 210 void ConvertHeaderBytes(ipc_msg_hdr *hdr)
 211         {
 212         hdr->version   = htonl(hdr->version);
 213         hdr->datalen   = htonl(hdr->datalen);
 214         hdr->ipc_flags = htonl(hdr->ipc_flags);
 215         hdr->op        = htonl(hdr->op );
 216         hdr->reg_index = htonl(hdr->reg_index);
 217         }