274 lines
7.8 KiB
Zig
274 lines
7.8 KiB
Zig
const std = @import("index.zig");
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const linux = std.os.linux;
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const assert = std.debug.assert;
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const endian = std.endian;
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// TODO don't trust this file, it bit rotted. start over
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error SigInterrupt;
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error Io;
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error TimedOut;
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error ConnectionReset;
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error ConnectionRefused;
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error OutOfMemory;
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error NotSocket;
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error BadFd;
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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 {
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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);
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switch (send_err) {
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0 => return send_ret,
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linux.EINVAL => unreachable,
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linux.EFAULT => unreachable,
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linux.ECONNRESET => return error.ConnectionReset,
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linux.EINTR => return error.SigInterrupt,
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// TODO there are more possible errors
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else => return error.Unexpected,
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}
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}
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pub fn recv(c: Connection, buf: []u8) -> %[]u8 {
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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);
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switch (recv_err) {
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0 => return buf[0..recv_ret],
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linux.EINVAL => unreachable,
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linux.EFAULT => unreachable,
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linux.ENOTSOCK => return error.NotSocket,
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linux.EINTR => return error.SigInterrupt,
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linux.ENOMEM => return error.OutOfMemory,
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linux.ECONNREFUSED => return error.ConnectionRefused,
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linux.EBADF => return error.BadFd,
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// TODO more error values
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else => return error.Unexpected,
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}
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}
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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,
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linux.EBADF => unreachable,
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linux.EINTR => return error.SigInterrupt,
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linux.EIO => return error.Io,
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else => return error.Unexpected,
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}
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}
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};
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const Address = struct {
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family: u16,
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scope_id: u32,
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addr: [16]u8,
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sort_key: i32,
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};
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pub fn lookup(hostname: []const u8, out_addrs: []Address) -> %[]Address {
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if (hostname.len == 0) {
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unreachable; // TODO
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}
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unreachable; // TODO
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}
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pub fn connectAddr(addr: &Address, port: u16) -> %Connection {
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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) {
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// TODO figure out possible errors from socket()
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return error.Unexpected;
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}
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const socket_fd = i32(socket_ret);
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const connect_ret = if (addr.family == linux.AF_INET) x: {
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var os_addr: linux.sockaddr_in = undefined;
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os_addr.family = addr.family;
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os_addr.port = endian.swapIfLe(u16, port);
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@memcpy((&u8)(&os_addr.addr), &addr.addr[0], 4);
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@memset(&os_addr.zero[0], 0, @sizeOf(@typeOf(os_addr.zero)));
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break :x linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in));
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} else if (addr.family == linux.AF_INET6) x: {
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var os_addr: linux.sockaddr_in6 = undefined;
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os_addr.family = addr.family;
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os_addr.port = endian.swapIfLe(u16, port);
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os_addr.flowinfo = 0;
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os_addr.scope_id = addr.scope_id;
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@memcpy(&os_addr.addr[0], &addr.addr[0], 16);
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break :x linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in6));
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} else {
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unreachable;
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};
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const connect_err = linux.getErrno(connect_ret);
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if (connect_err > 0) {
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switch (connect_err) {
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linux.ETIMEDOUT => return error.TimedOut,
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else => {
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// TODO figure out possible errors from connect()
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return error.Unexpected;
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},
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}
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}
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return Connection {
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.socket_fd = socket_fd,
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};
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}
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pub fn connect(hostname: []const u8, port: u16) -> %Connection {
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var addrs_buf: [1]Address = undefined;
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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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}
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error InvalidIpLiteral;
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pub fn parseIpLiteral(buf: []const u8) -> %Address {
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return error.InvalidIpLiteral;
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}
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fn hexDigit(c: u8) -> u8 {
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// TODO use switch with range
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if ('0' <= c and c <= '9') {
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return c - '0';
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} else if ('A' <= c and c <= 'Z') {
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return c - 'A' + 10;
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} else if ('a' <= c and c <= 'z') {
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return c - 'a' + 10;
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} else {
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return @maxValue(u8);
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}
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}
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error InvalidChar;
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error Overflow;
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error JunkAtEnd;
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error Incomplete;
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fn parseIp6(buf: []const u8) -> %Address {
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var result: Address = undefined;
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result.family = linux.AF_INET6;
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result.scope_id = 0;
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const ip_slice = result.addr[0..];
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var x: u16 = 0;
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var saw_any_digits = false;
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var index: u8 = 0;
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var scope_id = false;
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for (buf) |c| {
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if (scope_id) {
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if (c >= '0' and c <= '9') {
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const digit = c - '0';
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if (@mulWithOverflow(u32, result.scope_id, 10, &result.scope_id)) {
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return error.Overflow;
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}
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if (@addWithOverflow(u32, result.scope_id, digit, &result.scope_id)) {
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return error.Overflow;
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}
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} else {
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return error.InvalidChar;
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}
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} else if (c == ':') {
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if (!saw_any_digits) {
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return error.InvalidChar;
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}
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if (index == 14) {
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return error.JunkAtEnd;
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}
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ip_slice[index] = @truncate(u8, x >> 8);
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index += 1;
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ip_slice[index] = @truncate(u8, x);
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index += 1;
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x = 0;
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saw_any_digits = false;
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} else if (c == '%') {
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if (!saw_any_digits) {
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return error.InvalidChar;
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}
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if (index == 14) {
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ip_slice[index] = @truncate(u8, x >> 8);
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index += 1;
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ip_slice[index] = @truncate(u8, x);
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index += 1;
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}
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scope_id = true;
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saw_any_digits = false;
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} else {
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const digit = hexDigit(c);
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if (digit == @maxValue(u8)) {
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return error.InvalidChar;
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}
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if (@mulWithOverflow(u16, x, 16, &x)) {
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return error.Overflow;
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}
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if (@addWithOverflow(u16, x, digit, &x)) {
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return error.Overflow;
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}
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saw_any_digits = true;
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}
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}
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if (!saw_any_digits) {
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return error.Incomplete;
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}
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if (scope_id) {
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return result;
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}
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if (index == 14) {
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ip_slice[14] = @truncate(u8, x >> 8);
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ip_slice[15] = @truncate(u8, x);
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return result;
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}
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return error.Incomplete;
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}
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fn parseIp4(buf: []const u8) -> %u32 {
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var result: u32 = undefined;
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const out_ptr = ([]u8)((&result)[0..1]);
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var x: u8 = 0;
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var index: u8 = 0;
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var saw_any_digits = false;
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for (buf) |c| {
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if (c == '.') {
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if (!saw_any_digits) {
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return error.InvalidChar;
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}
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if (index == 3) {
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return error.JunkAtEnd;
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}
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out_ptr[index] = x;
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index += 1;
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x = 0;
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saw_any_digits = false;
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} else if (c >= '0' and c <= '9') {
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saw_any_digits = true;
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const digit = c - '0';
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if (@mulWithOverflow(u8, x, 10, &x)) {
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return error.Overflow;
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}
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if (@addWithOverflow(u8, x, digit, &x)) {
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return error.Overflow;
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}
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} else {
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return error.InvalidChar;
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}
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}
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if (index == 3 and saw_any_digits) {
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out_ptr[index] = x;
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return result;
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}
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return error.Incomplete;
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}
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