Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define TRACE_TAG TRANSPORT |
| 18 | |
| 19 | #include "transport.h" |
| 20 | |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 21 | #ifdef _WIN32 |
| 22 | #include <winsock2.h> |
| 23 | #else |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 24 | #include <arpa/inet.h> |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 25 | #endif |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 26 | |
| 27 | #include <android-base/stringprintf.h> |
| 28 | #include <dns_sd.h> |
| 29 | |
| 30 | #include "adb_mdns.h" |
| 31 | #include "adb_trace.h" |
| 32 | #include "fdevent.h" |
| 33 | #include "sysdeps.h" |
| 34 | |
| 35 | static DNSServiceRef service_ref; |
| 36 | static fdevent service_ref_fde; |
| 37 | |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 38 | // Use adb_DNSServiceRefSockFD() instead of calling DNSServiceRefSockFD() |
| 39 | // directly so that the socket is put through the appropriate compatibility |
| 40 | // layers to work with the rest of ADB's internal APIs. |
| 41 | static inline int adb_DNSServiceRefSockFD(DNSServiceRef ref) { |
| 42 | return adb_register_socket(DNSServiceRefSockFD(ref)); |
| 43 | } |
| 44 | #define DNSServiceRefSockFD ___xxx_DNSServiceRefSockFD |
| 45 | |
| 46 | static void DNSSD_API register_service_ip(DNSServiceRef sdRef, |
| 47 | DNSServiceFlags flags, |
| 48 | uint32_t interfaceIndex, |
| 49 | DNSServiceErrorType errorCode, |
| 50 | const char* hostname, |
| 51 | const sockaddr* address, |
| 52 | uint32_t ttl, |
| 53 | void* context); |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 54 | |
| 55 | static void pump_service_ref(int /*fd*/, unsigned ev, void* data) { |
| 56 | DNSServiceRef* ref = reinterpret_cast<DNSServiceRef*>(data); |
| 57 | |
| 58 | if (ev & FDE_READ) |
| 59 | DNSServiceProcessResult(*ref); |
| 60 | } |
| 61 | |
| 62 | class AsyncServiceRef { |
| 63 | public: |
| 64 | bool Initialized() { |
| 65 | return initialized_; |
| 66 | } |
| 67 | |
| 68 | virtual ~AsyncServiceRef() { |
| 69 | if (! initialized_) { |
| 70 | return; |
| 71 | } |
| 72 | |
| 73 | DNSServiceRefDeallocate(sdRef_); |
| 74 | fdevent_remove(&fde_); |
| 75 | } |
| 76 | |
| 77 | protected: |
| 78 | DNSServiceRef sdRef_; |
| 79 | |
| 80 | void Initialize() { |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 81 | fdevent_install(&fde_, adb_DNSServiceRefSockFD(sdRef_), |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 82 | pump_service_ref, &sdRef_); |
| 83 | fdevent_set(&fde_, FDE_READ); |
| 84 | initialized_ = true; |
| 85 | } |
| 86 | |
| 87 | private: |
| 88 | bool initialized_; |
| 89 | fdevent fde_; |
| 90 | }; |
| 91 | |
| 92 | class ResolvedService : public AsyncServiceRef { |
| 93 | public: |
| 94 | virtual ~ResolvedService() = default; |
| 95 | |
| 96 | ResolvedService(std::string name, uint32_t interfaceIndex, |
| 97 | const char* hosttarget, uint16_t port) : |
| 98 | name_(name), |
| 99 | port_(port) { |
Casey Dahlin | c969b37 | 2016-08-23 14:48:28 -0700 | [diff] [blame] | 100 | |
| 101 | /* TODO: We should be able to get IPv6 support by adding |
| 102 | * kDNSServiceProtocol_IPv6 to the flags below. However, when we do |
| 103 | * this, we get served link-local addresses that are usually useless to |
| 104 | * connect to. What's more, we seem to /only/ get those and nothing else. |
| 105 | * If we want IPv6 in the future we'll have to figure out why. |
| 106 | */ |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 107 | DNSServiceErrorType ret = |
| 108 | DNSServiceGetAddrInfo( |
| 109 | &sdRef_, 0, interfaceIndex, |
Casey Dahlin | c969b37 | 2016-08-23 14:48:28 -0700 | [diff] [blame] | 110 | kDNSServiceProtocol_IPv4, hosttarget, |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 111 | register_service_ip, reinterpret_cast<void*>(this)); |
| 112 | |
| 113 | if (ret != kDNSServiceErr_NoError) { |
| 114 | D("Got %d from DNSServiceGetAddrInfo.", ret); |
| 115 | } else { |
| 116 | Initialize(); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | void Connect(const sockaddr* address) { |
| 121 | char ip_addr[INET6_ADDRSTRLEN]; |
| 122 | const void* ip_addr_data; |
| 123 | const char* addr_format; |
| 124 | |
| 125 | if (address->sa_family == AF_INET) { |
| 126 | ip_addr_data = |
| 127 | &reinterpret_cast<const sockaddr_in*>(address)->sin_addr; |
| 128 | addr_format = "%s:%hu"; |
| 129 | } else if (address->sa_family == AF_INET6) { |
| 130 | ip_addr_data = |
| 131 | &reinterpret_cast<const sockaddr_in6*>(address)->sin6_addr; |
| 132 | addr_format = "[%s]:%hu"; |
| 133 | } else { // Should be impossible |
| 134 | D("mDNS resolved non-IP address."); |
| 135 | return; |
| 136 | } |
| 137 | |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 138 | // Winsock version requires the const cast Because Microsoft. |
| 139 | if (!inet_ntop(address->sa_family, const_cast<void*>(ip_addr_data), |
| 140 | ip_addr, INET6_ADDRSTRLEN)) { |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 141 | D("Could not convert IP address to string."); |
| 142 | return; |
| 143 | } |
| 144 | |
| 145 | std::string response; |
| 146 | connect_device(android::base::StringPrintf(addr_format, ip_addr, port_), |
| 147 | &response); |
| 148 | D("Connect to %s (%s:%hu) : %s", name_.c_str(), ip_addr, port_, |
| 149 | response.c_str()); |
| 150 | } |
| 151 | |
| 152 | private: |
| 153 | std::string name_; |
| 154 | const uint16_t port_; |
| 155 | }; |
| 156 | |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 157 | static void DNSSD_API register_service_ip(DNSServiceRef /*sdRef*/, |
| 158 | DNSServiceFlags /*flags*/, |
| 159 | uint32_t /*interfaceIndex*/, |
| 160 | DNSServiceErrorType /*errorCode*/, |
| 161 | const char* /*hostname*/, |
| 162 | const sockaddr* address, |
| 163 | uint32_t /*ttl*/, |
| 164 | void* context) { |
| 165 | D("Got IP for service."); |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 166 | std::unique_ptr<ResolvedService> data( |
| 167 | reinterpret_cast<ResolvedService*>(context)); |
| 168 | data->Connect(address); |
| 169 | } |
| 170 | |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 171 | static void DNSSD_API register_resolved_mdns_service(DNSServiceRef sdRef, |
| 172 | DNSServiceFlags flags, |
| 173 | uint32_t interfaceIndex, |
| 174 | DNSServiceErrorType errorCode, |
| 175 | const char* fullname, |
| 176 | const char* hosttarget, |
| 177 | uint16_t port, |
| 178 | uint16_t txtLen, |
| 179 | const unsigned char* txtRecord, |
| 180 | void* context); |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 181 | |
| 182 | class DiscoveredService : public AsyncServiceRef { |
| 183 | public: |
| 184 | DiscoveredService(uint32_t interfaceIndex, const char* serviceName, |
| 185 | const char* regtype, const char* domain) |
| 186 | : serviceName_(serviceName) { |
| 187 | |
| 188 | DNSServiceErrorType ret = |
| 189 | DNSServiceResolve(&sdRef_, 0, interfaceIndex, serviceName, regtype, |
| 190 | domain, register_resolved_mdns_service, |
| 191 | reinterpret_cast<void*>(this)); |
| 192 | |
| 193 | if (ret != kDNSServiceErr_NoError) { |
| 194 | D("Got %d from DNSServiceResolve.", ret); |
| 195 | } else { |
| 196 | Initialize(); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | const char* ServiceName() { |
| 201 | return serviceName_.c_str(); |
| 202 | } |
| 203 | |
| 204 | private: |
| 205 | std::string serviceName_; |
| 206 | }; |
| 207 | |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 208 | static void DNSSD_API register_resolved_mdns_service(DNSServiceRef sdRef, |
| 209 | DNSServiceFlags flags, |
| 210 | uint32_t interfaceIndex, |
| 211 | DNSServiceErrorType errorCode, |
| 212 | const char* fullname, |
| 213 | const char* hosttarget, |
| 214 | uint16_t port, |
| 215 | uint16_t /*txtLen*/, |
| 216 | const unsigned char* /*txtRecord*/, |
| 217 | void* context) { |
| 218 | D("Resolved a service."); |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 219 | std::unique_ptr<DiscoveredService> discovered( |
| 220 | reinterpret_cast<DiscoveredService*>(context)); |
| 221 | |
| 222 | if (errorCode != kDNSServiceErr_NoError) { |
| 223 | D("Got error %d resolving service.", errorCode); |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | auto resolved = |
| 229 | new ResolvedService(discovered->ServiceName(), |
| 230 | interfaceIndex, hosttarget, ntohs(port)); |
| 231 | |
| 232 | if (! resolved->Initialized()) { |
| 233 | delete resolved; |
| 234 | } |
| 235 | |
| 236 | if (flags) { /* Only ever equals MoreComing or 0 */ |
| 237 | discovered.release(); |
| 238 | } |
| 239 | } |
| 240 | |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 241 | static void DNSSD_API register_mdns_transport(DNSServiceRef sdRef, |
| 242 | DNSServiceFlags flags, |
| 243 | uint32_t interfaceIndex, |
| 244 | DNSServiceErrorType errorCode, |
| 245 | const char* serviceName, |
| 246 | const char* regtype, |
| 247 | const char* domain, |
| 248 | void* /*context*/) { |
| 249 | D("Registering a transport."); |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 250 | if (errorCode != kDNSServiceErr_NoError) { |
| 251 | D("Got error %d during mDNS browse.", errorCode); |
| 252 | DNSServiceRefDeallocate(sdRef); |
| 253 | fdevent_remove(&service_ref_fde); |
| 254 | return; |
| 255 | } |
| 256 | |
| 257 | auto discovered = new DiscoveredService(interfaceIndex, serviceName, |
| 258 | regtype, domain); |
| 259 | |
| 260 | if (! discovered->Initialized()) { |
| 261 | delete discovered; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | void init_mdns_transport_discovery(void) { |
| 266 | DNSServiceErrorType errorCode = |
| 267 | DNSServiceBrowse(&service_ref, 0, 0, kADBServiceType, nullptr, |
| 268 | register_mdns_transport, nullptr); |
| 269 | |
| 270 | if (errorCode != kDNSServiceErr_NoError) { |
| 271 | D("Got %d initiating mDNS browse.", errorCode); |
| 272 | return; |
| 273 | } |
| 274 | |
| 275 | fdevent_install(&service_ref_fde, |
Casey Dahlin | 20238f2 | 2016-09-21 14:03:39 -0700 | [diff] [blame] | 276 | adb_DNSServiceRefSockFD(service_ref), |
Casey Dahlin | 3122cdf | 2016-06-23 14:19:37 -0700 | [diff] [blame] | 277 | pump_service_ref, |
| 278 | &service_ref); |
| 279 | fdevent_set(&service_ref_fde, FDE_READ); |
| 280 | } |