HAXY

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╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ serve_ssh_protocol.zig ───────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯

╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ╯

.. embed/ event/ test/ ui/ command.zig event.zig lib.zig main.zig main_wasm.zig serve.zig serve_common.zig serve_http.zig serve_ssh.zig ╭─────────────────────────────────╮ │serve_ssh_protocol.zig │ ╰─────────────────────────────────╯ test.zig testnet.zig try.zig ui.zig web.zig

1737 sc_cipher: *Cipher, 1738 writer: *std.Io.Writer, 1739 ch: *Channel, 1740 packet: []const u8, 1741 extended: bool, 1742 ) !void { 1743 // byte SSH_MSG_CHANNEL_DATA/EXTENDED_DATA 1744 // uint32 recipient_channel 1745 // [if extended: uint32 type_code] 1746 // string data 1747 const payload = try parseChannelData(packet, extended, ch.local_id); 1748 const data_len: u32 = @intCast(payload.len); 1749 1750 if (data_len > ch.local_window) return error.WindowExceeded; 1751 ch.local_window -= data_len; 1752 try maybeRefillRecvWindow(io, allocator, sc_cipher, writer, ch); 1753 } 1754 1755 pub fn parseChannelData(packet: []const u8, extended: bool, expected_channel: u32) ![]const u8 { 1756 if (packet.len < 1) return error.EmptyPacket; 1757 var r = std.Io.Reader.fixed(packet[1..]); 1758 const recipient_channel = try r.takeInt(u32, .big); 1759 if (recipient_channel != expected_channel) return error.UnknownChannel; 1760 if (extended) { 1761 const data_type = try r.takeInt(u32, .big); 1762 if (data_type != SSH_EXTENDED_DATA_STDERR) return error.UnsupportedExtendedData; 1763 } 1764 const data_len = try r.takeInt(u32, .big); 1765 // catches both data_len > remaining (would otherwise be a bounds-check 1766 // panic on the slice) and trailing junk after the declared payload. 1767 if (data_len != r.buffered().len) return error.InvalidChannelData; 1768 return r.buffered(); 1769 } 1770 1771 fn parseChannelId(packet: []const u8, expected_channel: u32) !void { 1772 if (packet.len < 1) return error.EmptyPacket; 1773 var r = std.Io.Reader.fixed(packet[1..]); 1774 const recipient_channel = try r.takeInt(u32, .big); 1775 if (recipient_channel != expected_channel) return error.UnknownChannel; 1776 if (r.buffered().len != 0) return error.InvalidChannelMessage; 1777 } 1778 1779 /// Send a CHANNEL_WINDOW_ADJUST if our receive window has dipped below half 1780 /// of the initial value. Used both for the pre-session discard path and by 1781 /// SessionCtx after it consumes a CHANNEL_DATA payload. 1782 fn maybeRefillRecvWindow( 1783 io: std.Io, 1784 allocator: std.mem.Allocator, 1785 sc_cipher: *Cipher, 1786 writer: *std.Io.Writer, 1787 ch: *Channel, 1788 ) !void { 1789 if (ch.local_window >= initial_recv_window / 2) return; 1790 const add = initial_recv_window - ch.local_window; 1791 ch.local_window += add; 1792 var adj: std.ArrayList(u8) = .empty; 1793 defer adj.deinit(allocator); 1794 try adj.append(allocator, SSH_MSG_CHANNEL_WINDOW_ADJUST); 1795 try writeU32(&adj, allocator, ch.remote_id); 1796 try writeU32(&adj, allocator, add); 1797 try sc_cipher.writePacket(io, allocator, writer, adj.items); 1798 } 1799 1800 pub fn writeU32(buf: *std.ArrayList(u8), allocator: std.mem.Allocator, value: u32) !void { 1801 var bytes: [4]u8 = undefined; 1802 std.mem.writeInt(u32, &bytes, value, .big); 1803 try buf.appendSlice(allocator, &bytes); 1804 } 1805