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sm-mobile-20261016T185235Z-8e93ecc1b59a Idinagdag: 2026-10-16 21:29 · Binuo: 2026-10-16 20:52

posix.dart Idinagdag: Hindi naitala ang petsa 7.5 KB · 241 linya

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1import 'dart:ffi';

2import 'dart:io';

3import 'dart:typed_data';

5/// Minimal POSIX socket bindings for unprivileged ICMP.

6///

7/// Darwin (iOS, macOS) and Linux (Android) both allow `SOCK_DGRAM` sockets

8/// with `IPPROTO_ICMP`/`IPPROTO_ICMPV6` without root. They differ in

9/// constants, in the `sockaddr` layout, in whether the IPv4 header is

10/// delivered, and in how ICMP errors arrive: Darwin delivers them as normal

11/// messages, Linux through the socket error queue (`IP_RECVERR`).

12final class PollFd extends Struct {

13 @Int32()

14 external int fd;

15 @Int16()

16 external int events;

17 @Int16()

18 external int revents;

19}

21final class IoVec extends Struct {

22 external Pointer<Uint8> base;

23 @IntPtr()

24 external int length;

25}

27/// Linux `struct msghdr`; the FFI layout follows the 32/64-bit ABI.

28final class MsgHdr extends Struct {

29 external Pointer<Uint8> name;

30 @Uint32()

31 external int nameLength;

32 external Pointer<IoVec> iov;

33 @IntPtr()

34 external int iovLength;

35 external Pointer<Uint8> control;

36 @IntPtr()

37 external int controlLength;

38 @Int32()

39 external int flags;

40}

42/// Linux `struct cmsghdr`.

43final class CmsgHdr extends Struct {

44 @IntPtr()

45 external int length;

46 @Int32()

47 external int level;

48 @Int32()

49 external int type;

50}

52class Posix {

53 final bool darwin;

54 final DynamicLibrary _lib;

55 Posix._(this.darwin, this._lib);

57 static Posix? _instance;

59 /// Null where neither the Darwin nor the Linux implementation applies.

60 static Posix? get current {

61 if (_instance != null) return _instance;

62 if (Platform.isIOS || Platform.isMacOS) {

63 return _instance = Posix._(true, DynamicLibrary.process());

64 }

65 if (Platform.isAndroid) {

66 return _instance = Posix._(false, DynamicLibrary.open('libc.so'));

67 }

68 if (Platform.isLinux) {

69 return _instance = Posix._(false, DynamicLibrary.process());

70 }

71 return null;

72 }

74 // Constants (Darwin / Linux).

75 int get afInet => 2;

76 int get afInet6 => darwin ? 30 : 10;

77 int get sockDgram => 2;

78 int get sockStream => 1;

79 int get ipprotoUdp => 17;

80 int get ipprotoTcp => 6;

81 int get solSocket => darwin ? 0xffff : 1;

82 int get soError => darwin ? 0x1007 : 4;

83 int get fGetFl => 3;

84 int get fSetFl => 4;

85 int get oNonBlock => darwin ? 0x4 : 0x800;

86 // Don't Fragment: IP_DONTFRAG on Darwin; IP_MTU_DISCOVER = IP_PMTUDISC_DO

87 // on Linux. IPv6: IPV6_DONTFRAG on Darwin; IPV6_MTU_DISCOVER on Linux.

88 int get ipDontFrag => darwin ? 28 : 10;

89 int get ipv6DontFrag => darwin ? 62 : 23;

90 int get dontFragValue => darwin ? 1 : 2;

91 int get ipprotoIp => 0;

92 int get ipprotoIpv6 => 41;

93 int get ipprotoIcmp => 1;

94 int get ipprotoIcmpv6 => 58;

95 int get ipTtl => darwin ? 4 : 2;

96 int get ipv6UnicastHops => darwin ? 4 : 16;

97 int get ipRecvErr => 11;

98 int get ipv6RecvErr => 25;

99 int get msgErrQueue => 0x2000;

100 int get msgDontWait => darwin ? 0x80 : 0x40;

101 static const pollIn = 0x1, pollOut = 0x4, pollErr = 0x8;

102 // Linux sock_extended_err.ee_origin values.

103 static const originIcmp = 2, originIcmp6 = 3;

104

105 late final socket = _lib

106 .lookupFunction<

107 Int32 Function(Int32, Int32, Int32),

108 int Function(int, int, int)

109 >('socket');

110 late final close = _lib

111 .lookupFunction<Int32 Function(Int32), int Function(int)>('close');

112 late final setsockopt = _lib

113 .lookupFunction<

114 Int32 Function(Int32, Int32, Int32, Pointer<Void>, Uint32),

115 int Function(int, int, int, Pointer<Void>, int)

116 >('setsockopt');

117 late final sendto = _lib

118 .lookupFunction<

119 IntPtr Function(

120 Int32,

121 Pointer<Uint8>,

122 IntPtr,

123 Int32,

124 Pointer<Uint8>,

125 Uint32,

126 ),

127 int Function(int, Pointer<Uint8>, int, int, Pointer<Uint8>, int)

128 >('sendto');

129 late final recvfrom = _lib

130 .lookupFunction<

131 IntPtr Function(

132 Int32,

133 Pointer<Uint8>,

134 IntPtr,

135 Int32,

136 Pointer<Uint8>,

137 Pointer<Uint32>,

138 ),

139 int Function(

140 int,

141 Pointer<Uint8>,

142 int,

143 int,

144 Pointer<Uint8>,

145 Pointer<Uint32>,

146 )

147 >('recvfrom');

148 late final connect = _lib

149 .lookupFunction<

150 Int32 Function(Int32, Pointer<Uint8>, Uint32),

151 int Function(int, Pointer<Uint8>, int)

152 >('connect');

153 late final getsockname = _lib

154 .lookupFunction<

155 Int32 Function(Int32, Pointer<Uint8>, Pointer<Uint32>),

156 int Function(int, Pointer<Uint8>, Pointer<Uint32>)

157 >('getsockname');

158 late final getsockopt = _lib

159 .lookupFunction<

160 Int32 Function(Int32, Int32, Int32, Pointer<Void>, Pointer<Uint32>),

161 int Function(int, int, int, Pointer<Void>, Pointer<Uint32>)

162 >('getsockopt');

163 late final fcntl = _lib

164 .lookupFunction<

165 Int32 Function(Int32, Int32, VarArgs<(Int32,)>),

166 int Function(int, int, int)

167 >('fcntl');

168 late final recvmsg = _lib

169 .lookupFunction<

170 IntPtr Function(Int32, Pointer<MsgHdr>, Int32),

171 int Function(int, Pointer<MsgHdr>, int)

172 >('recvmsg');

173 // nfds_t is unsigned int on Darwin and unsigned long on Linux.

174 late final int Function(Pointer<PollFd>, int, int) poll = darwin

175 ? _lib.lookupFunction<

176 Int32 Function(Pointer<PollFd>, Uint32, Int32),

177 int Function(Pointer<PollFd>, int, int)

178 >('poll')

179 : _lib.lookupFunction<

180 Int32 Function(Pointer<PollFd>, UnsignedLong, Int32),

181 int Function(Pointer<PollFd>, int, int)

182 >('poll');

183 late final Pointer<Int32> Function() _errnoLocation = _lib

184 .lookupFunction<Pointer<Int32> Function(), Pointer<Int32> Function()>(

185 darwin

186 ? '__error'

187 : (Platform.isAndroid ? '__errno' : '__errno_location'),

188 );

189

190 /// The calling thread's errno, read right after a failed call.

191 int get errno => _errnoLocation().value;

192

193 // errno values that need a specific explanation.

194 int get eAccess => 13;

195 int get ePerm => 1;

196 int get eNetUnreach => darwin ? 51 : 101;

197 int get eHostUnreach => darwin ? 65 : 113;

198 int get eInProgress => darwin ? 36 : 115;

199 int get eConnRefused => darwin ? 61 : 111;

200 int get eMsgSize => darwin ? 40 : 90;

201

202 /// `struct sockaddr_in` / `sockaddr_in6` for [address] and [port].

203 Uint8List sockaddr(InternetAddress address, [int port = 0]) {

204 final v6 = address.type == InternetAddressType.IPv6;

205 final raw = address.rawAddress;

206 final out = Uint8List(v6 ? 28 : 16);

207 if (darwin) {

208 out[0] = out.length;

209 out[1] = v6 ? afInet6 : afInet;

210 } else {

211 final family = v6 ? afInet6 : afInet;

212 out[0] = family & 0xff;

213 out[1] = family >> 8;

214 }

215 out[2] = (port >> 8) & 0xff;

216 out[3] = port & 0xff;

217 out.setRange(v6 ? 8 : 4, v6 ? 24 : 8, raw);

218 return out;

219 }

220

221 /// The port of a `sockaddr_in` / `sockaddr_in6` (network byte order).

222 int port(Uint8List sockaddr) =>

223 sockaddr.length < 4 ? 0 : (sockaddr[2] << 8) | sockaddr[3];

224

225 /// The address in a `sockaddr_in` / `sockaddr_in6` returned by the kernel.

226 InternetAddress? address(Uint8List sockaddr, int length) {

227 if (length >= 24 && sockaddr.length >= 24) {

228 final family = darwin ? sockaddr[1] : sockaddr[0] | (sockaddr[1] << 8);

229 if (family == afInet6) {

230 return InternetAddress.fromRawAddress(sockaddr.sublist(8, 24));

231 }

232 }

233 if (length >= 8 && sockaddr.length >= 8) {

234 final family = darwin ? sockaddr[1] : sockaddr[0] | (sockaddr[1] << 8);

235 if (family == afInet) {

236 return InternetAddress.fromRawAddress(sockaddr.sublist(4, 8));

237 }

238 }

239 return null;

240 }

241}

242

SHA-256

01152c0883838cc3329f3a326a972870af872ff60036de8e6c22f2de9d205df1

CH-J Proprietary Software License 1.14 · Ibinibigay ang source sa ilalim ng CH-J Proprietary Software License 1.14. Hindi binabago ng pagiging available nito ang mga tuntunin ng lisensya at hindi ito nagbibigay ng karagdagang karapatan.

SHA-256 ng archive

46e427a43e87af091004f36145590bda8fe90086dfb0f631afeb5029fb0b5655