1 /* -*- Mode: C; tab-width: 4 -*- 2 * 3 * Copyright (c) 2003-2015 Apple 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 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 29 #ifndef DNSSD_IPC_H 30 #define DNSSD_IPC_H 31 32 #include "dns_sd.h" 33 34 // 35 // Common cross platform services 36 // 37 #if defined(WIN32) 38 # include <winsock2.h> 39 # define dnssd_InvalidSocket INVALID_SOCKET 40 # define dnssd_SocketValid(s) ((s) != INVALID_SOCKET) 41 # define dnssd_EWOULDBLOCK WSAEWOULDBLOCK 42 # define dnssd_EINTR WSAEINTR 43 # define dnssd_ECONNRESET WSAECONNRESET 44 # define dnssd_socklen_t int 45 # define dnssd_close(sock) closesocket(sock) 46 # define dnssd_errno WSAGetLastError() 47 # define dnssd_strerror(X) win32_strerror(X) 48 # define ssize_t int 49 # define getpid _getpid 50 # define unlink _unlink 51 extern char *win32_strerror(int inErrorCode); 52 #else 53 # include <sys/types.h> 54 # include <unistd.h> 55 # include <sys/un.h> 56 # include <string.h> 57 # include <stdio.h> 58 # include <stdlib.h> 59 # include <sys/stat.h> 60 # include <sys/socket.h> 61 # include <netinet/in.h> 62 # include <arpa/inet.h> 63 # define dnssd_InvalidSocket -1 64 # define dnssd_SocketValid(s) ((s) >= 0) 65 # define dnssd_EWOULDBLOCK EWOULDBLOCK 66 # define dnssd_EINTR EINTR 67 # define dnssd_ECONNRESET ECONNRESET 68 # define dnssd_EPIPE EPIPE 69 # define dnssd_socklen_t unsigned int 70 # define dnssd_close(sock) close(sock) 71 # define dnssd_errno errno 72 # define dnssd_strerror(X) strerror(X) 73 #endif 74 75 #if defined(USE_TCP_LOOPBACK) 76 # define AF_DNSSD AF_INET 77 # define MDNS_TCP_SERVERADDR "127.0.0.1" 78 # define MDNS_TCP_SERVERPORT 5354 79 # define LISTENQ 5 80 # define dnssd_sockaddr_t struct sockaddr_in 81 #else 82 # define AF_DNSSD AF_LOCAL 83 # ifndef MDNS_UDS_SERVERPATH 84 # define MDNS_UDS_SERVERPATH "/var/run/mDNSResponder" 85 # endif 86 # define MDNS_UDS_SERVERPATH_ENVVAR "DNSSD_UDS_PATH" 87 # define LISTENQ 100 88 // longest legal control path length 89 # define MAX_CTLPATH (sizeof(((struct sockaddr_un*)0)->sun_path)) 90 # define dnssd_sockaddr_t struct sockaddr_un 91 #endif 92 93 // Compatibility workaround 94 #ifndef AF_LOCAL 95 #define AF_LOCAL AF_UNIX 96 #endif 97 98 // General UDS constants 99 #define TXT_RECORD_INDEX ((uint32_t)(-1)) // record index for default text record 100 101 // IPC data encoding constants and types 102 #define VERSION 1 103 #define IPC_FLAGS_NOREPLY 1 // set flag if no asynchronous replies are to be sent to client 104 105 // Structure packing macro. If we're not using GNUC, it's not fatal. Most compilers naturally pack the on-the-wire 106 // structures correctly anyway, so a plain "struct" is usually fine. In the event that structures are not packed 107 // correctly, our compile-time assertion checks will catch it and prevent inadvertent generation of non-working code. 108 #ifndef packedstruct 109 #if ((__GNUC__ > 2) || ((__GNUC__ == 2) && (__GNUC_MINOR__ >= 9))) 110 #define packedstruct struct __attribute__((__packed__)) 111 #define packedunion union __attribute__((__packed__)) 112 #else 113 #define packedstruct struct 114 #define packedunion union 115 #endif 116 #endif 117 118 typedef enum 119 { 120 request_op_none = 0, // No request yet received on this connection 121 connection_request = 1, // connected socket via DNSServiceConnect() 122 reg_record_request, // reg/remove record only valid for connected sockets 123 remove_record_request, 124 enumeration_request, 125 reg_service_request, 126 browse_request, 127 resolve_request, 128 query_request, 129 reconfirm_record_request, 130 add_record_request, 131 update_record_request, 132 setdomain_request, // Up to here is in Tiger and B4W 1.0.3 133 getproperty_request, // New in B4W 1.0.4 134 port_mapping_request, // New in Leopard and B4W 2.0 135 addrinfo_request, 136 send_bpf, // New in SL 137 getpid_request, 138 release_request, 139 connection_delegate_request, 140 141 cancel_request = 63 142 } request_op_t; 143 144 typedef enum 145 { 146 enumeration_reply_op = 64, 147 reg_service_reply_op, 148 browse_reply_op, 149 resolve_reply_op, 150 query_reply_op, 151 reg_record_reply_op, // Up to here is in Tiger and B4W 1.0.3 152 getproperty_reply_op, // New in B4W 1.0.4 153 port_mapping_reply_op, // New in Leopard and B4W 2.0 154 addrinfo_reply_op 155 } reply_op_t; 156 157 #if defined(_WIN64) 158 # pragma pack(push,4) 159 #elif !defined(__GNUC__) 160 # pragma pack(1) 161 #endif 162 163 // Define context object big enough to hold a 64-bit pointer, 164 // to accomodate 64-bit clients communicating with 32-bit daemon. 165 // There's no reason for the daemon to ever be a 64-bit process, but its clients might be 166 typedef packedunion 167 { 168 void *context; 169 uint32_t u32[2]; 170 } client_context_t; 171 172 typedef packedstruct 173 { 174 uint32_t version; 175 uint32_t datalen; 176 uint32_t ipc_flags; 177 uint32_t op; // request_op_t or reply_op_t 178 client_context_t client_context; // context passed from client, returned by server in corresponding reply 179 uint32_t reg_index; // identifier for a record registered via DNSServiceRegisterRecord() on a 180 // socket connected by DNSServiceCreateConnection(). Must be unique in the scope of the connection, such that and 181 // index/socket pair uniquely identifies a record. (Used to select records for removal by DNSServiceRemoveRecord()) 182 } ipc_msg_hdr; 183 184 #if defined(_WIN64) 185 # pragma pack(pop) 186 #elif !defined(__GNUC__) 187 # pragma pack() 188 #endif 189 190 // routines to write to and extract data from message buffers. 191 // caller responsible for bounds checking. 192 // ptr is the address of the pointer to the start of the field. 193 // it is advanced to point to the next field, or the end of the message 194 195 void put_uint32(const uint32_t l, char **ptr); 196 uint32_t get_uint32(const char **ptr, const char *end); 197 198 void put_uint16(uint16_t s, char **ptr); 199 uint16_t get_uint16(const char **ptr, const char *end); 200 201 #define put_flags put_uint32 202 #define get_flags get_uint32 203 204 #define put_error_code put_uint32 205 #define get_error_code get_uint32 206 207 int put_string(const char *str, char **ptr); 208 int get_string(const char **ptr, const char *const end, char *buffer, int buflen); 209 210 void put_rdata(const int rdlen, const unsigned char *rdata, char **ptr); 211 const char *get_rdata(const char **ptr, const char *end, int rdlen); // return value is rdata pointed to by *ptr - 212 // rdata is not copied from buffer. 213 214 void ConvertHeaderBytes(ipc_msg_hdr *hdr); 215 216 struct CompileTimeAssertionChecks_dnssd_ipc 217 { 218 // Check that the compiler generated our on-the-wire packet format structure definitions 219 // properly packed, without adding padding bytes to align fields on 32-bit or 64-bit boundaries. 220 char assert0[(sizeof(client_context_t) == 8) ? 1 : -1]; 221 char assert1[(sizeof(ipc_msg_hdr) == 28) ? 1 : -1]; 222 }; 223 224 #endif // DNSSD_IPC_H 225