zig/std/net.zig

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const std = @import("index.zig");
const linux = std.os.linux;
const assert = std.debug.assert;
const endian = std.endian;
// TODO don't trust this file, it bit rotted. start over
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const Connection = struct {
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socket_fd: i32,
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pub fn send(c: Connection, buf: []const u8) !usize {
const send_ret = linux.sendto(c.socket_fd, buf.ptr, buf.len, 0, null, 0);
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const send_err = linux.getErrno(send_ret);
switch (send_err) {
0 => return send_ret,
linux.EINVAL => unreachable,
linux.EFAULT => unreachable,
linux.ECONNRESET => return error.ConnectionReset,
linux.EINTR => return error.SigInterrupt,
// TODO there are more possible errors
else => return error.Unexpected,
}
}
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pub fn recv(c: Connection, buf: []u8) ![]u8 {
const recv_ret = linux.recvfrom(c.socket_fd, buf.ptr, buf.len, 0, null, null);
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const recv_err = linux.getErrno(recv_ret);
switch (recv_err) {
0 => return buf[0..recv_ret],
linux.EINVAL => unreachable,
linux.EFAULT => unreachable,
linux.ENOTSOCK => return error.NotSocket,
linux.EINTR => return error.SigInterrupt,
linux.ENOMEM => return error.OutOfMemory,
linux.ECONNREFUSED => return error.ConnectionRefused,
linux.EBADF => return error.BadFd,
// TODO more error values
else => return error.Unexpected,
}
}
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pub fn close(c: Connection) !void {
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switch (linux.getErrno(linux.close(c.socket_fd))) {
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0 => return,
linux.EBADF => unreachable,
linux.EINTR => return error.SigInterrupt,
linux.EIO => return error.Io,
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else => return error.Unexpected,
}
}
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};
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const Address = struct {
family: u16,
scope_id: u32,
addr: [16]u8,
sort_key: i32,
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};
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pub fn lookup(hostname: []const u8, out_addrs: []Address) ![]Address {
if (hostname.len == 0) {
unreachable; // TODO
}
unreachable; // TODO
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}
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pub fn connectAddr(addr: &Address, port: u16) !Connection {
const socket_ret = linux.socket(addr.family, linux.SOCK_STREAM, linux.PROTO_tcp);
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const socket_err = linux.getErrno(socket_ret);
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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) x: {
var os_addr: linux.sockaddr_in = undefined;
os_addr.family = addr.family;
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os_addr.port = endian.swapIfLe(u16, port);
@memcpy((&u8)(&os_addr.addr), &addr.addr[0], 4);
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@memset(&os_addr.zero[0], 0, @sizeOf(@typeOf(os_addr.zero)));
break :x linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in));
} else if (addr.family == linux.AF_INET6) x: {
var os_addr: linux.sockaddr_in6 = undefined;
os_addr.family = addr.family;
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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);
break :x linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in6));
} else {
unreachable;
};
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const connect_err = linux.getErrno(connect_ret);
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if (connect_err > 0) {
switch (connect_err) {
linux.ETIMEDOUT => return error.TimedOut,
else => {
// TODO figure out possible errors from connect()
return error.Unexpected;
},
}
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}
return Connection {
.socket_fd = socket_fd,
};
}
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pub fn connect(hostname: []const u8, port: u16) !Connection {
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var addrs_buf: [1]Address = undefined;
const addrs_slice = try lookup(hostname, addrs_buf[0..]);
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const main_addr = &addrs_slice[0];
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return connectAddr(main_addr, port);
}
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pub fn parseIpLiteral(buf: []const u8) !Address {
return error.InvalidIpLiteral;
}
fn hexDigit(c: u8) u8 {
// TODO use switch with range
if ('0' <= c and c <= '9') {
return c - '0';
} else if ('A' <= c and c <= 'Z') {
return c - 'A' + 10;
} else if ('a' <= c and c <= 'z') {
return c - 'a' + 10;
} else {
return @maxValue(u8);
}
}
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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';
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if (@mulWithOverflow(u32, result.scope_id, 10, &result.scope_id)) {
return error.Overflow;
}
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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 {
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const digit = hexDigit(c);
if (digit == @maxValue(u8)) {
return error.InvalidChar;
}
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if (@mulWithOverflow(u16, x, 16, &x)) {
return error.Overflow;
}
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if (@addWithOverflow(u16, x, digit, &x)) {
return error.Overflow;
}
saw_any_digits = true;
}
}
if (!saw_any_digits) {
return error.Incomplete;
}
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;
}
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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';
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if (@mulWithOverflow(u8, x, 10, &x)) {
return error.Overflow;
}
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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;
}