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const std = @import("std");
const testing = std.testing;
const c9 = @import("root.zig");
const Pair = struct {
client_in: [4096]u8 = undefined,
client_out: [4096]u8 = undefined,
server_in: [4096]u8 = undefined,
server_out: [8192]u8 = undefined,
client: c9.Client = undefined,
server: c9.Server = undefined,
fn init(p: *Pair) !void {
p.client = .init(.{ .in = &p.client_in, .out = &p.client_out });
p.server = .init(.{ .in = &p.server_in, .out = &p.server_out });
_ = try p.client.submit(.{ .version = .{} });
const request = try p.nextRequest();
try p.server.negotiate(request.msg.tversion.msize, request.msg.tversion.version);
p.server.release();
try testing.expectEqual(c9.Client.Op.version, (try p.nextResult()).op);
}
fn nextRequest(p: *Pair) !c9.Decoded {
// Exercise every frame boundary through single-byte delivery.
while (p.client.output().len != 0) {
try testing.expectEqual(@as(usize, 1), p.server.push(p.client.output()[0..1]));
p.client.wrote(1);
if (try p.server.receive()) |request| return request;
}
return (try p.server.receive()) orelse error.NoRequest;
}
fn nextResult(p: *Pair) !c9.Client.Done {
while (p.server.output().len != 0) {
try testing.expectEqual(@as(usize, 1), p.client.push(p.server.output()[0..1]));
p.server.wrote(1);
if (p.client.take()) |result| return result;
}
return p.client.take() orelse error.NoResult;
}
fn exchange(p: *Pair, req: c9.Client.Request, response: c9.Msg) !void {
const tag = try p.client.submit(req);
const request = try p.nextRequest();
try testing.expectEqual(tag, request.tag);
try p.server.reply(tag, response);
p.server.release();
const result = try p.nextResult();
try testing.expectEqual(std.meta.activeTag(req), result.op);
try testing.expectEqualStrings(@tagName(req), @tagName(result.result));
}
};
const qid: c9.Qid = .{ .type = 0, .version = 1, .path = 2 };
const stat: c9.Stat = .{
.type = 0,
.dev = 0,
.qid = qid,
.mode = 0o600,
.atime = 0,
.mtime = 0,
.length = 0,
.name = "file",
.uid = "user",
.gid = "group",
.muid = "user",
};
test "all base 9P2000 client operations through fragmented server transport" {
var p: Pair = .{};
try p.init();
try p.exchange(.{ .auth = .{ .afid = 1, .uname = "user" } }, .{ .rauth = .{ .aqid = qid } });
try p.exchange(.{ .attach = .{ .fid = 2, .afid = 1, .uname = "user" } }, .{ .rattach = .{ .qid = qid } });
try p.exchange(.{ .walk = .{ .fid = 2, .newfid = 3, .names = &.{"file"} } }, .{ .rwalk = .{ .nwqid = 1, .wqid = @splat(qid) } });
try p.exchange(.{ .open = .{ .fid = 3, .mode = 2 } }, .{ .ropen = .{ .qid = qid, .iounit = 0 } });
try p.exchange(.{ .create = .{ .fid = 2, .name = "new", .perm = 0o600, .mode = 2 } }, .{ .rcreate = .{ .qid = qid, .iounit = 0 } });
try p.exchange(.{ .read = .{ .fid = 3, .offset = 0, .count = 3 } }, .{ .rread = .{ .data = "abc" } });
try p.exchange(.{ .write = .{ .fid = 3, .offset = 0, .data = "abc" } }, .{ .rwrite = .{ .count = 2 } });
try p.exchange(.{ .stat = .{ .fid = 3 } }, .{ .rstat = .{ .stat = stat } });
try p.exchange(.{ .wstat = .{ .fid = 3, .stat = stat } }, .rwstat);
try p.exchange(.{ .clunk = .{ .fid = 3 } }, .rclunk);
try p.exchange(.{ .remove = .{ .fid = 2 } }, .rremove);
try p.exchange(.{ .flush = .{ .oldtag = 42 } }, .rflush);
}
test "flush holds oldtag until Rflush, including a completed original request" {
for ([_]bool{ false, true }) |complete| {
var p: Pair = .{};
try p.init();
const oldtag = try p.client.submit(.{ .read = .{ .fid = 1, .offset = 0, .count = 1 } });
_ = try p.nextRequest();
p.server.release();
const flush = try p.client.submit(.{ .flush = .{ .oldtag = oldtag } });
_ = try p.nextRequest();
p.server.release();
if (complete) {
try p.server.reply(oldtag, .{ .rread = .{ .data = "x" } });
try testing.expectEqual(oldtag, (try p.nextResult()).tag);
try testing.expectEqual(@as(usize, 2), p.client.pending());
}
const other = try p.client.submit(.{ .stat = .{ .fid = 1 } });
try testing.expect(other != oldtag and other != flush);
try p.server.reply(flush, .rflush);
try testing.expectEqual(flush, (try p.nextResult()).tag);
try testing.expectEqual(@as(usize, 1), p.client.pending());
try testing.expectError(error.UnknownTag, p.server.reply(oldtag, .{ .rread = .{ .data = "x" } }));
const reused = try p.client.submit(.{ .stat = .{ .fid = 1 } });
try testing.expectEqual(oldtag, reused);
}
}
test "response bounds and reply types are checked before output is changed" {
var p: Pair = .{};
try p.init();
const tag = try p.client.submit(.{ .write = .{ .fid = 1, .offset = 0, .data = "a" } });
_ = try p.nextRequest();
p.server.release();
try testing.expectError(error.WrongReply, p.server.reply(tag, .{ .rwrite = .{ .count = 2 } }));
try testing.expectError(error.WrongReply, p.server.reply(tag, .rclunk));
try testing.expectEqual(@as(usize, 0), p.server.output().len);
try p.server.reply(tag, .{ .rwrite = .{ .count = 1 } });
_ = try p.nextResult();
}
test "stat outer length overflow is rejected without writing output" {
var name: [65535 - 48]u8 = @splat('a');
var entry = stat;
entry.name = &name;
entry.uid = "";
entry.gid = "";
entry.muid = "";
var buffer: [65550]u8 = @splat(0xaa);
try testing.expectError(error.Overlong, c9.encode(.{ .rstat = .{ .stat = entry } }, 1, &buffer));
try testing.expect(std.mem.allEqual(u8, &buffer, 0xaa));
}
test "arbitrary input decoder round trip" {
try testing.fuzz({}, fuzzDecode, .{});
}
fn fuzzDecode(_: void, smith: *testing.Smith) !void {
var input_buffer: [65536]u8 = undefined;
const input = input_buffer[0..smith.slice(&input_buffer)];
const decoded = c9.decode(input) catch return;
var buffer: [65536]u8 = undefined;
const encoded = try c9.encode(decoded.msg, decoded.tag, &buffer);
try testing.expectEqualSlices(u8, input, encoded);
}
test "flush can cancel a full request window and reserves unused oldtags" {
var p: Pair = .{};
try p.init();
_ = try p.client.submit(.{ .flush = .{ .oldtag = 2 } });
const next = try p.client.submit(.{ .stat = .{ .fid = 0 } });
try testing.expect(next != 2);
const third = try p.client.submit(.{ .stat = .{ .fid = 0 } });
try testing.expect(third != 2);
p.client.hangup();
try p.init();
for (0..c9.max_tags) |_| _ = try p.client.submit(.{ .stat = .{ .fid = 0 } });
try testing.expectError(error.NoTags, p.client.submit(.{ .stat = .{ .fid = 0 } }));
const flush = try p.client.submit(.{ .flush = .{ .oldtag = 0 } });
try testing.expectEqual(@as(u16, c9.max_tags), flush);
}
test "multiple flushes retain reservations until each response and can themselves be flushed" {
var p: Pair = .{};
try p.init();
const oldtag = try p.client.submit(.{ .read = .{ .fid = 1, .offset = 0, .count = 1 } });
_ = try p.nextRequest();
p.server.release();
const first = try p.client.submit(.{ .flush = .{ .oldtag = oldtag } });
_ = try p.nextRequest();
p.server.release();
const second = try p.client.submit(.{ .flush = .{ .oldtag = oldtag } });
_ = try p.nextRequest();
p.server.release();
try p.server.reply(first, .rflush);
_ = try p.nextResult();
const held = try p.client.submit(.{ .stat = .{ .fid = 1 } });
try testing.expect(held != oldtag);
try p.server.reply(second, .rflush);
_ = try p.nextResult();
try testing.expectEqual(oldtag, try p.client.submit(.{ .stat = .{ .fid = 1 } }));
try p.init();
const read_tag = try p.client.submit(.{ .read = .{ .fid = 1, .offset = 0, .count = 1 } });
_ = try p.nextRequest();
p.server.release();
const flush_tag = try p.client.submit(.{ .flush = .{ .oldtag = read_tag } });
_ = try p.nextRequest();
p.server.release();
const cancel_flush = try p.client.submit(.{ .flush = .{ .oldtag = flush_tag } });
_ = try p.nextRequest();
p.server.release();
try p.server.reply(read_tag, .{ .rread = .{ .data = "x" } });
_ = try p.nextResult();
try p.server.reply(cancel_flush, .rflush);
_ = try p.nextResult();
try testing.expectEqual(@as(usize, 0), p.client.pending());
}
test "server reserves cancellation capacity and rejects duplicate pending tags" {
var input: [4096]u8 = undefined;
var output: [4096]u8 = undefined;
var server: c9.Server = .init(.{ .in = &input, .out = &output });
server.msize = 4096;
var frame: [64]u8 = undefined;
for (0..64) |i| {
const bytes = try c9.encode(.{ .tstat = .{ .fid = 1 } }, @intCast(i), &frame);
_ = server.push(bytes);
_ = (try server.receive()).?;
server.release();
}
_ = server.push(try c9.encode(.{ .tflush = .{ .oldtag = 0 } }, 100, &frame));
_ = (try server.receive()).?;
server.release();
try server.reply(100, .rflush);
server.wrote(server.output().len);
_ = server.push(try c9.encode(.{ .tstat = .{ .fid = 1 } }, 1, &frame));
try testing.expectError(error.Protocol, server.receive());
try testing.expect(server.dead);
}
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