1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
|
const linux = @import("os/linux.zig");
const errno = @import("os/errno.zig");
const assert = @import("debug.zig").assert;
const endian = @import("endian.zig");
error SigInterrupt;
error Unexpected;
error Io;
error TimedOut;
error ConnectionReset;
error ConnectionRefused;
error NoMem;
error NotSocket;
error BadFd;
const Connection = struct {
socket_fd: i32,
pub fn send(c: Connection, buf: []const u8) -> %usize {
const send_ret = linux.sendto(c.socket_fd, buf.ptr, buf.len, 0, null, 0);
const send_err = linux.getErrno(send_ret);
switch (send_err) {
0 => return send_ret,
errno.EINVAL => unreachable,
errno.EFAULT => unreachable,
errno.ECONNRESET => return error.ConnectionReset,
errno.EINTR => return error.SigInterrupt,
// TODO there are more possible errors
else => return error.Unexpected,
}
}
pub fn recv(c: Connection, buf: []u8) -> %[]u8 {
const recv_ret = linux.recvfrom(c.socket_fd, buf.ptr, buf.len, 0, null, null);
const recv_err = linux.getErrno(recv_ret);
switch (recv_err) {
0 => return buf[0...recv_ret],
errno.EINVAL => unreachable,
errno.EFAULT => unreachable,
errno.ENOTSOCK => return error.NotSocket,
errno.EINTR => return error.SigInterrupt,
errno.ENOMEM => return error.NoMem,
errno.ECONNREFUSED => return error.ConnectionRefused,
errno.EBADF => return error.BadFd,
// TODO more error values
else => return error.Unexpected,
}
}
pub fn close(c: Connection) -> %void {
switch (linux.getErrno(linux.close(c.socket_fd))) {
0 => return,
errno.EBADF => unreachable,
errno.EINTR => return error.SigInterrupt,
errno.EIO => return error.Io,
else => return error.Unexpected,
}
}
};
const Address = struct {
family: u16,
scope_id: u32,
addr: [16]u8,
sort_key: i32,
};
pub fn lookup(hostname: []const u8, out_addrs: []Address) -> %[]Address {
if (hostname.len == 0) {
//
// if (family != AF_INET6)
// buf[cnt++] = (struct address){ .family = AF_INET, .addr = { 127,0,0,1 } };
// if (family != AF_INET)
// buf[cnt++] = (struct address){ .family = AF_INET6, .addr = { [15] = 1 } };
//
unreachable // TODO
}
// TODO
//switch (parseIpLiteral(hostname)) {
// Ok => |addr| {
// out_addrs[0] = addr;
// return out_addrs[0...1];
// },
// else => {},
//};
unreachable // TODO
}
pub fn connectAddr(addr: &Address, port: u16) -> %Connection {
const socket_ret = linux.socket(addr.family, linux.SOCK_STREAM, linux.PROTO_tcp);
const socket_err = linux.getErrno(socket_ret);
if (socket_err > 0) {
// TODO figure out possible errors from socket()
return error.Unexpected;
}
const socket_fd = i32(socket_ret);
const connect_ret = if (addr.family == linux.AF_INET) {
var os_addr: linux.sockaddr_in = undefined;
os_addr.family = addr.family;
os_addr.port = endian.swapIfLe(u16, port);
@memcpy((&u8)(&os_addr.addr), &addr.addr[0], 4);
@memset(&os_addr.zero[0], 0, @sizeOf(@typeOf(os_addr.zero)));
linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in))
} else if (addr.family == linux.AF_INET6) {
var os_addr: linux.sockaddr_in6 = undefined;
os_addr.family = addr.family;
os_addr.port = endian.swapIfLe(u16, port);
os_addr.flowinfo = 0;
os_addr.scope_id = addr.scope_id;
@memcpy(&os_addr.addr[0], &addr.addr[0], 16);
linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in6))
} else {
unreachable
};
const connect_err = linux.getErrno(connect_ret);
if (connect_err > 0) {
switch (connect_err) {
errno.ETIMEDOUT => return error.TimedOut,
else => {
// TODO figure out possible errors from connect()
return error.Unexpected;
},
}
}
return Connection {
.socket_fd = socket_fd,
};
}
pub fn connect(hostname: []const u8, port: u16) -> %Connection {
var addrs_buf: [1]Address = undefined;
const addrs_slice = %return lookup(hostname, addrs_buf[0...]);
const main_addr = &addrs_slice[0];
return connectAddr(main_addr, port);
}
error InvalidIpLiteral;
pub fn parseIpLiteral(buf: []const u8) -> %Address {
// TODO
//switch (parseIp4(buf)) {
// Ok => |ip4| {
// var result: Address = undefined;
// @memcpy(&result.addr[0], (&u8)(&ip4), @sizeOf(u32));
// result.family = linux.AF_INET;
// result.scope_id = 0;
// return result;
// },
// else => {},
//}
//switch (parseIp6(buf)) {
// Ok => |addr| {
// return addr;
// },
// else => {},
//}
return error.InvalidIpLiteral;
}
fn hexDigit(c: u8) -> u8 {
// TODO use switch with range
if ('0' <= c and c <= '9') {
c - '0'
} else if ('A' <= c and c <= 'Z') {
c - 'A' + 10
} else if ('a' <= c and c <= 'z') {
c - 'a' + 10
} else {
@maxValue(u8)
}
}
error InvalidChar;
error Overflow;
error JunkAtEnd;
error Incomplete;
fn parseIp6(buf: []const u8) -> %Address {
var result: Address = undefined;
result.family = linux.AF_INET6;
result.scope_id = 0;
const ip_slice = result.addr[0...];
var x: u16 = 0;
var saw_any_digits = false;
var index: u8 = 0;
var scope_id = false;
for (buf) |c| {
if (scope_id) {
if (c >= '0' and c <= '9') {
const digit = c - '0';
if (@mulWithOverflow(u32, result.scope_id, 10, &result.scope_id)) {
return error.Overflow;
}
if (@addWithOverflow(u32, result.scope_id, digit, &result.scope_id)) {
return error.Overflow;
}
} else {
return error.InvalidChar;
}
} else if (c == ':') {
if (!saw_any_digits) {
return error.InvalidChar;
}
if (index == 14) {
return error.JunkAtEnd;
}
ip_slice[index] = @truncate(u8, x >> 8);
index += 1;
ip_slice[index] = @truncate(u8, x);
index += 1;
x = 0;
saw_any_digits = false;
} else if (c == '%') {
if (!saw_any_digits) {
return error.InvalidChar;
}
if (index == 14) {
ip_slice[index] = @truncate(u8, x >> 8);
index += 1;
ip_slice[index] = @truncate(u8, x);
index += 1;
}
scope_id = true;
saw_any_digits = false;
} else {
const digit = hexDigit(c);
if (digit == @maxValue(u8)) {
return error.InvalidChar;
}
if (@mulWithOverflow(u16, x, 16, &x)) {
return error.Overflow;
}
if (@addWithOverflow(u16, x, digit, &x)) {
return error.Overflow;
}
saw_any_digits = true;
}
}
if (!saw_any_digits) {
return error.Incomplete;
}
//
// if (p) {
// if (isdigit(*++p)) scopeid = strtoull(p, &z, 10);
// else z = p-1;
// if (*z) {
// if (!IN6_IS_ADDR_LINKLOCAL(&a6) and
// !IN6_IS_ADDR_MC_LINKLOCAL(&a6))
// return EAI_NONAME;
// scopeid = if_nametoindex(p);
// if (!scopeid) return EAI_NONAME;
// }
// if (scopeid > UINT_MAX) return EAI_NONAME;
// }
//
if (scope_id) {
return result;
}
if (index == 14) {
ip_slice[14] = @truncate(u8, x >> 8);
ip_slice[15] = @truncate(u8, x);
return result;
}
return error.Incomplete;
}
fn parseIp4(buf: []const u8) -> %u32 {
var result: u32 = undefined;
const out_ptr = ([]u8)((&result)[0...1]);
var x: u8 = 0;
var index: u8 = 0;
var saw_any_digits = false;
for (buf) |c| {
if (c == '.') {
if (!saw_any_digits) {
return error.InvalidChar;
}
if (index == 3) {
return error.JunkAtEnd;
}
out_ptr[index] = x;
index += 1;
x = 0;
saw_any_digits = false;
} else if (c >= '0' and c <= '9') {
saw_any_digits = true;
const digit = c - '0';
if (@mulWithOverflow(u8, x, 10, &x)) {
return error.Overflow;
}
if (@addWithOverflow(u8, x, digit, &x)) {
return error.Overflow;
}
} else {
return error.InvalidChar;
}
}
if (index == 3 and saw_any_digits) {
out_ptr[index] = x;
return result;
}
return error.Incomplete;
}
// TODO
//fn testParseIp4() {
// @setFnTest(this);
//
// assert(%%parseIp4("127.0.0.1") == endian.swapIfLe(u32, 0x7f000001));
// switch (parseIp4("256.0.0.1")) { Overflow => {}, else => unreachable, }
// switch (parseIp4("x.0.0.1")) { InvalidChar => {}, else => unreachable, }
// switch (parseIp4("127.0.0.1.1")) { JunkAtEnd => {}, else => unreachable, }
// switch (parseIp4("127.0.0.")) { Incomplete => {}, else => unreachable, }
// switch (parseIp4("100..0.1")) { InvalidChar => {}, else => unreachable, }
//}
//
//fn testParseIp6() {
// @setFnTest(this);
//
// {
// const addr = %%parseIp6("FF01:0:0:0:0:0:0:FB");
// assert(addr.addr[0] == 0xff);
// assert(addr.addr[1] == 0x01);
// assert(addr.addr[2] == 0x00);
// }
//}
//
//fn testLookupSimpleIp() {
// @setFnTest(this);
//
// {
// var addrs_buf: [5]Address = undefined;
// const addrs = %%lookup("192.168.1.1", addrs_buf);
// assert(addrs.len == 1);
// const addr = addrs[0];
// assert(addr.family == linux.AF_INET);
// assert(addr.addr[0] == 192);
// assert(addr.addr[1] == 168);
// assert(addr.addr[2] == 1);
// assert(addr.addr[3] == 1);
// }
//}
|
