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 } 218