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e663d54051
Zig 0.16's hostname validation routine is RFC 1123-compliant, so we can
use it directly rather than rolling our own.
Ref: efe649b13e
Ref: https://github.com/ziglang/zig/pull/25710
64 lines
2.2 KiB
Zig
64 lines
2.2 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const posix = std.posix;
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pub const LocalHostnameValidationError = error{
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PermissionDenied,
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Unexpected,
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};
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/// Checks if a hostname is local to the current machine. This matches
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/// both "localhost" and the current hostname of the machine (as returned
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/// by `gethostname`).
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pub fn isLocal(hostname: []const u8) LocalHostnameValidationError!bool {
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// A 'localhost' hostname is always considered local.
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if (std.mem.eql(u8, "localhost", hostname)) return true;
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// If hostname is not "localhost" it must match our hostname.
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switch (builtin.os.tag) {
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.windows => {
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const windows = @import("windows.zig");
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var buf: [256:0]u8 = undefined;
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var nSize: windows.DWORD = buf.len;
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if (windows.exp.kernel32.GetComputerNameA(&buf, &nSize) == windows.FALSE) return false;
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const ourHostname = buf[0..nSize];
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return std.mem.eql(u8, hostname, ourHostname);
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},
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else => {
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var buf: [posix.HOST_NAME_MAX]u8 = undefined;
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const ourHostname = try posix.gethostname(&buf);
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return std.mem.eql(u8, hostname, ourHostname);
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},
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}
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}
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test "isLocal returns true when provided hostname is localhost" {
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try std.testing.expect(try isLocal("localhost"));
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}
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test "isLocal returns true when hostname is local" {
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switch (builtin.os.tag) {
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.windows => {
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const windows = @import("windows.zig");
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var buf: [256:0]u8 = undefined;
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var nSize: windows.DWORD = buf.len;
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if (windows.exp.kernel32.GetComputerNameA(&buf, &nSize) == windows.FALSE)
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return error.GetComputerNameFailed;
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const localHostname = buf[0..nSize];
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try std.testing.expect(try isLocal(localHostname));
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},
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else => {
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var buf: [posix.HOST_NAME_MAX]u8 = undefined;
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const localHostname = try posix.gethostname(&buf);
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try std.testing.expect(try isLocal(localHostname));
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},
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}
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}
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test "isLocal returns false when hostname is not local" {
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try std.testing.expectEqual(
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false,
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try isLocal("not-the-local-hostname"),
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);
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}
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