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0.1.0 ... dev

Author SHA1 Message Date
Robby Zambito
f202410f0d Include license and readme in build output 
This is probably required for GPL compliance :-D
 2026-02-03 23:06:30 -05:00
Robby Zambito
9dcbc44aa1 ReleaseSmall by default 2026-02-03 22:50:24 -05:00
Robby Zambito
d1fdf0c1be Automatically publish binaries to nextcloud 
Updated the releases directory to use a specific account for releases
 2026-02-03 22:44:53 -05:00
Robby Zambito
f13221133d Set dev version to 0.0.0 2026-02-01 21:10:50 -05:00
Robby Zambito
2c9e648c2c Clean API and add docs 2026-02-01 21:02:38 -05:00
Robby Zambito
558f40213b Update to Saprus 0.2.1 
Handle management messages instead of letting them bubble up through the
connection to the consumer.
Right now, this just means handling ping messages by sending a pong.

Also updated to follow the new handshake flow.
The sentinel will mirror the ports instead of matching them.

Now filters on the full source and dest ports, which are less likely to
have erroneous matches.
 2026-02-01 19:16:22 -05:00
Robby Zambito
daf18d3552 Exec command directly if subshell fails 
If execing the child fails, it might be because the shell doesn't exist.
Try running the command directly before giving up.
 2026-01-31 21:43:27 -05:00
Robby Zambito
4f721afcfd Add GPLv3 2026-01-31 20:27:55 -05:00
14 changed files with 1211 additions and 228 deletions
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.tangled/workflows/build.yml Normal file
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when:
- event: ["push", "pull_request", "manual"]
branch: ["dev", "master", "test*"]
tag: ["v*"]
engine: "nixery"
dependencies:
nixpkgs:
- rclone
git+https://github.com/mitchellh/zig-overlay:
- master
steps:
- name: "Build"
command: "zig build -Doptimize=ReleaseSmall -Dcpu=baseline"
- name: "Publish"
command: |
rclone sync ./zig-out \
--webdav-url "$RELEASE_NEXTCLOUD_HOST/remote.php/dav/files/$RELEASE_NEXTCLOUD_USER/" \
--webdav-user "$RELEASE_NEXTCLOUD_USER" \
--webdav-pass "$RELEASE_NEXTCLOUD_PASS" \
--webdav-vendor nextcloud \
:webdav:"zaprus/zaprus-$TANGLED_REF_NAME" \
-q

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# GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc.
<https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
## Preamble
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THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
### 17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
## How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these
terms.
To do so, attach the following notices to the program. It is safest to
attach them to the start of each source file to most effectively state
the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper
mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands \`show w' and \`show c' should show the
appropriate parts of the General Public License. Of course, your
program's commands might be different; for a GUI interface, you would
use an "about box".
You should also get your employer (if you work as a programmer) or
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. For more information on this, and how to apply and follow
the GNU GPL, see <https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your
program into proprietary programs. If your program is a subroutine
library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the
GNU Lesser General Public License instead of this License. But first,
please read <https://www.gnu.org/licenses/why-not-lgpl.html>.

11
README.md Normal file
View File

@@ -0,0 +1,11 @@
# zaprus
This is an implementation of the [Saprus protocol](https://gitlab.com/c2-games/red-team/saprus) in Zig.
It is useful for developing clients either in Zig, or in any other language using the C bindings.
Binary releases can be downloaded [here](https://cloud.zambito.xyz/s/7jJPTm68Zp3mN8F).
The code for this can be found here:
- https://tangled.org/zambyte.robbyzambito.me/zaprus
- https://git.robbyzambito.me/zaprus

22
build.zig
View File

@@ -7,6 +7,9 @@ const std = @import("std");
// build runner to parallelize the build automatically (and the cache system to
// know when a step doesn't need to be re-run).
pub fn build(b: *std.Build) void {
// Ensure the license is included in the output directory
b.installFile("LICENSE.md", "LICENSE.md");
b.installFile("README.md", "README.md");
// Standard target options allow the person running `zig build` to choose
// what target to build for. Here we do not override the defaults, which
// means any target is allowed, and the default is native. Other options
@@ -21,6 +24,9 @@ pub fn build(b: *std.Build) void {
// target and optimize options) will be listed when running `zig build --help`
// in this directory.
// Get default install step (called with `zig build` or `zig build install`)
const install_step = b.getInstallStep();
// This creates a module, which represents a collection of source files alongside
// some compilation options, such as optimization mode and linked system libraries.
// Zig modules are the preferred way of making Zig code available to consumers.
@@ -41,6 +47,22 @@ pub fn build(b: *std.Build) void {
.target = target,
});
// Only used to generate the documentation
const zaprus_lib = b.addLibrary(.{
.name = "zaprus",
.root_module = mod,
});
const docs_step = b.step("doc", "Emit documentation");
const docs_install = b.addInstallDirectory(.{
.install_dir = .prefix,
.install_subdir = "docs",
.source_dir = zaprus_lib.getEmittedDocs(),
});
docs_step.dependOn(&docs_install.step);
install_step.dependOn(docs_step);
// Create static library
const lib = b.addLibrary(.{
.name = "zaprus",

2
build.zig.zon
View File

@@ -10,7 +10,7 @@
// This is a [Semantic Version](https://semver.org/).
// In a future version of Zig it will be used for package deduplication.
.version = "0.1.0",
.version = "0.0.0",
// Together with name, this represents a globally unique package
// identifier. This field is generated by the Zig toolchain when the

10
include/zaprus.h
View File

@@ -1,3 +1,13 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with Zaprus. If not, see <https://www.gnu.org/licenses/>.
#ifndef ZAPRUS_H
#define ZAPRUS_H

46
src/Client.zig
View File

@@ -1,3 +1,21 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
//! A client is used to handle interactions with the network.
const base64_enc = std.base64.standard.Encoder;
const base64_dec = std.base64.standard.Decoder;
@@ -21,6 +39,8 @@ pub fn deinit(self: *Client) void {
self.* = undefined;
}
/// Sends a fire and forget message over the network.
/// This function asserts that `payload` fits within a single packet.
pub fn sendRelay(self: *Client, io: Io, payload: []const u8, dest: [4]u8) !void {
const io_source: std.Random.IoSource = .{ .io = io };
const rand = io_source.interface();
@@ -60,7 +80,8 @@ pub fn sendRelay(self: *Client, io: Io, payload: []const u8, dest: [4]u8) !void
try self.socket.send(full_msg);
}
pub fn connect(self: Client, io: Io, payload: []const u8) !SaprusConnection {
/// Attempts to establish a new connection with the sentinel.
pub fn connect(self: Client, io: Io, payload: []const u8) (error{ BpfAttachFailed, Timeout } || SaprusMessage.ParseError)!SaprusConnection {
const io_source: std.Random.IoSource = .{ .io = io };
const rand = io_source.interface();
@@ -84,7 +105,7 @@ pub fn connect(self: Client, io: Io, payload: []const u8) !SaprusConnection {
var connection: SaprusMessage = .{
.connection = .{
.src = rand.intRangeAtMost(u16, 1025, std.math.maxInt(u16)),
.dest = rand.intRangeAtMost(u16, 1025, std.math.maxInt(u16)),
.dest = rand.intRangeAtMost(u16, 1025, std.math.maxInt(u16)), // Ignored, but good noise
.seq = undefined,
.id = undefined,
.payload = payload,
@@ -92,7 +113,7 @@ pub fn connect(self: Client, io: Io, payload: []const u8) !SaprusConnection {
};
log.debug("Setting bpf filter to port {}", .{connection.connection.src});
self.socket.attachSaprusPortFilter(connection.connection.src) catch |err| {
self.socket.attachSaprusPortFilter(null, connection.connection.src) catch |err| {
log.err("Failed to set port filter: {t}", .{err});
return err;
};
@@ -115,7 +136,17 @@ pub fn connect(self: Client, io: Io, payload: []const u8) !SaprusConnection {
log.debug("Awaiting handshake response", .{});
// Ignore response from sentinel, just accept that we got one.
_ = try self.socket.receive(&res_buf);
const full_handshake_res = try self.socket.receive(&res_buf);
const handshake_res = saprusParse(full_handshake_res[42..]) catch |err| {
log.err("Parse error: {t}", .{err});
return err;
};
self.socket.attachSaprusPortFilter(handshake_res.connection.src, handshake_res.connection.dest) catch |err| {
log.err("Failed to set port filter: {t}", .{err});
return err;
};
connection.connection.dest = handshake_res.connection.src;
connection_bytes = connection.toBytes(&connection_buf);
headers.udp.dst_port = udp_dest_port;
headers.ip.id = rand.int(u16);
@@ -131,12 +162,17 @@ pub fn connect(self: Client, io: Io, payload: []const u8) !SaprusConnection {
try self.socket.send(full_msg);
return .init(self.socket, headers, connection);
return .{
.socket = self.socket,
.headers = headers,
.connection = connection,
};
}
const RawSocket = @import("./RawSocket.zig");
const SaprusMessage = @import("message.zig").Message;
const saprusParse = SaprusMessage.parse;
const SaprusConnection = @import("Connection.zig");
const EthIpUdp = @import("./EthIpUdp.zig").EthIpUdp;

84
src/Connection.zig
View File

@@ -1,36 +1,80 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
socket: RawSocket,
headers: EthIpUdp,
connection: SaprusMessage,
const Connection = @This();
pub fn init(socket: RawSocket, headers: EthIpUdp, connection: SaprusMessage) Connection {
return .{
.socket = socket,
.headers = headers,
.connection = connection,
};
// 'p' as base64
const pong = "cA==";
/// Attempts to read from the network, and returns the next message, if any.
///
/// Asserts that `buf` is large enough to store the message that is received.
///
/// This will internally process management messages, and return the message
/// payload for the next non management connection message.
/// This function is ignorant to the message encoding.
pub fn next(self: *Connection, io: Io, buf: []u8) ![]const u8 {
while (true) {
log.debug("Awaiting connection message", .{});
const res = try self.socket.receive(buf);
log.debug("Received {} byte connection message", .{res.len});
const msg = SaprusMessage.parse(res[42..]) catch |err| {
log.err("Failed to parse next message: {t}\n{x}\n{x}", .{ err, res[0..], res[42..] });
return err;
};
switch (msg) {
.connection => |con_res| {
if (try con_res.management()) |mgt| {
log.debug("Received management message {t}", .{mgt});
switch (mgt) {
.ping => {
log.debug("Sending pong", .{});
try self.send(io, .{ .management = true }, pong);
log.debug("Sent pong message", .{});
},
else => |m| log.debug("Received management message that I don't know how to handle: {t}", .{m}),
}
} else {
log.debug("Payload was {s}", .{con_res.payload});
return con_res.payload;
}
},
else => |m| {
std.debug.panic("Expected connection message, instead got {x}. This means there is an error with the BPF.", .{@intFromEnum(m)});
},
}
}
}
pub fn next(self: Connection, io: Io, buf: []u8) ![]const u8 {
_ = io;
log.debug("Awaiting connection message", .{});
const res = try self.socket.receive(buf);
log.debug("Received {} byte connection message", .{res.len});
const msg: SaprusMessage = try .parse(res[42..]);
const connection_res = msg.connection;
log.debug("Payload was {s}", .{connection_res.payload});
return connection_res.payload;
}
pub fn send(self: *Connection, io: Io, buf: []const u8) !void {
/// Attempts to write a message to the network.
///
/// Clients should pass `.{}` for options unless you know what you are doing.
/// `buf` will be sent over the network as-is; this function is ignorant of encoding.
pub fn send(self: *Connection, io: Io, options: SaprusMessage.Connection.Options, buf: []const u8) !void {
const io_source: std.Random.IoSource = .{ .io = io };
const rand = io_source.interface();
log.debug("Sending connection message", .{});
self.connection.connection.options = options;
self.connection.connection.payload = buf;
var connection_bytes_buf: [2048]u8 = undefined;
const connection_bytes = self.connection.toBytes(&connection_bytes_buf);

16
src/EthIpUdp.zig
View File

@@ -1,3 +1,19 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
pub const EthIpUdp = packed struct(u336) { // 42 bytes * 8 bits = 336
// --- UDP (Last in memory, defined first for LSB->MSB) ---
udp: packed struct {

48
src/RawSocket.zig
View File

@@ -1,3 +1,19 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
const RawSocket = @This();
const is_debug = builtin.mode == .Debug;
@@ -16,7 +32,12 @@ const Ifconf = extern struct {
},
};
pub fn init() !RawSocket {
pub fn init() error{
SocketError,
NicError,
NoInterfaceFound,
BindError,
}!RawSocket {
const socket: i32 = std.math.cast(i32, std.os.linux.socket(std.os.linux.AF.PACKET, std.os.linux.SOCK.RAW, 0)) orelse return error.SocketError;
if (socket < 0) return error.SocketError;
@@ -117,7 +138,7 @@ pub fn receive(self: RawSocket, buf: []u8) ![]u8 {
return buf[0..len];
}
pub fn attachSaprusPortFilter(self: RawSocket, port: u16) !void {
pub fn attachSaprusPortFilter(self: RawSocket, incoming_src_port: ?u16, incoming_dest_port: u16) !void {
const BPF = std.os.linux.BPF;
// BPF instruction structure for classic BPF
const SockFilter = extern struct {
@@ -133,11 +154,26 @@ pub fn attachSaprusPortFilter(self: RawSocket, port: u16) !void {
};
// Build the filter program
const filter = [_]SockFilter{
const filter = if (incoming_src_port) |inc_src| &[_]SockFilter{
// Load 2 bytes at offset 46 (absolute)
.{ .code = BPF.LD | BPF.H | BPF.ABS, .jt = 0, .jf = 0, .k = 46 },
// Jump if equal to port (skip 1 if true, skip 0 if false)
.{ .code = BPF.JMP | BPF.JEQ | BPF.K, .jt = 1, .jf = 0, .k = @as(u32, inc_src) },
// Return 0x0 (fail)
.{ .code = BPF.RET | BPF.K, .jt = 0, .jf = 0, .k = 0x0 },
// Load 2 bytes at offset 48 (absolute)
.{ .code = BPF.LD | BPF.H | BPF.ABS, .jt = 0, .jf = 0, .k = 48 },
// Jump if equal to port (skip 0 if true, skip 1 if false)
.{ .code = BPF.JMP | BPF.JEQ | BPF.K, .jt = 0, .jf = 1, .k = @as(u32, port) },
.{ .code = BPF.JMP | BPF.JEQ | BPF.K, .jt = 0, .jf = 1, .k = @as(u32, incoming_dest_port) },
// Return 0xffff (pass)
.{ .code = BPF.RET | BPF.K, .jt = 0, .jf = 0, .k = 0xffff },
// Return 0x0 (fail)
.{ .code = BPF.RET | BPF.K, .jt = 0, .jf = 0, .k = 0x0 },
} else &[_]SockFilter{
// Load 2 bytes at offset 48 (absolute)
.{ .code = BPF.LD | BPF.H | BPF.ABS, .jt = 0, .jf = 0, .k = 48 },
// Jump if equal to port (skip 0 if true, skip 1 if false)
.{ .code = BPF.JMP | BPF.JEQ | BPF.K, .jt = 0, .jf = 1, .k = @as(u32, incoming_dest_port) },
// Return 0xffff (pass)
.{ .code = BPF.RET | BPF.K, .jt = 0, .jf = 0, .k = 0xffff },
// Return 0x0 (fail)
@@ -145,8 +181,8 @@ pub fn attachSaprusPortFilter(self: RawSocket, port: u16) !void {
};
const fprog = SockFprog{
.len = filter.len,
.filter = &filter,
.len = @intCast(filter.len),
.filter = filter.ptr,
};
// Attach filter to socket using setsockopt

18
src/c_api.zig
View File

@@ -1,3 +1,19 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
const std = @import("std");
const zaprus = @import("zaprus");
@@ -83,6 +99,6 @@ export fn zaprus_connection_send(
const c: ?*zaprus.Connection = @ptrCast(@alignCast(connection));
const zc = c orelse return 1;
zc.send(io, payload[0..payload_len]) catch return 1;
zc.send(io, .{}, payload[0..payload_len]) catch return 1;
return 0;
}

52
src/main.zig
View File

@@ -1,3 +1,19 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
const is_debug = builtin.mode == .Debug;
const help =
@@ -162,7 +178,37 @@ pub fn main(init: std.process.Init) !void {
.stdout = .pipe,
.stderr = .ignore,
.stdin = .ignore,
}) catch continue;
}) catch |err| switch (err) {
error.AccessDenied,
error.FileBusy,
error.FileNotFound,
error.FileSystem,
error.InvalidExe,
error.IsDir,
error.NotDir,
error.OutOfMemory,
error.PermissionDenied,
error.SymLinkLoop,
error.SystemResources,
=> blk: {
log.debug("Trying to execute command directly: {s}", .{connection_payload});
var argv_buf: [128][]const u8 = undefined;
var argv: ArrayList([]const u8) = .initBuffer(&argv_buf);
var payload_iter = std.mem.splitAny(u8, connection_payload, " \t\n");
while (payload_iter.next()) |arg| argv.appendBounded(arg) catch continue;
break :blk std.process.spawn(init.io, .{
.argv = argv.items,
.stdout = .pipe,
.stderr = .ignore,
.stdin = .ignore,
}) catch continue;
},
error.Canceled,
error.NoDevice,
error.OperationUnsupported,
=> |e| return e,
else => continue,
};
var child_output_buf: [SaprusClient.max_payload_len]u8 = undefined;
var child_output_reader = child.stdout.?.reader(init.io, &child_output_buf);
@@ -184,7 +230,7 @@ pub fn main(init: std.process.Init) !void {
error.EndOfStream => {
cmd_output.print("{b64}", .{child_output_reader.interface.buffered()}) catch unreachable;
if (cmd_output.end > 0) {
connection.send(init.io, cmd_output.buffered()) catch |e| {
connection.send(init.io, .{}, cmd_output.buffered()) catch |e| {
log.debug("Failed to send connection chunk: {t}", .{e});
continue :next_message;
};
@@ -193,7 +239,7 @@ pub fn main(init: std.process.Init) !void {
},
};
cmd_output.print("{b64}", .{try child_output_reader.interface.takeArray(child_output_buf.len)}) catch unreachable;
connection.send(init.io, cmd_output.buffered()) catch |err| {
connection.send(init.io, .{}, cmd_output.buffered()) catch |err| {
log.debug("Failed to send connection chunk: {t}", .{err});
continue :next_message;
};

397
src/message.zig
View File

@@ -1,205 +1,232 @@
pub const MessageTypeError = error{
NotImplementedSaprusType,
UnknownSaprusType,
};
pub const MessageParseError = MessageTypeError || error{
InvalidMessage,
};
const message = @This();
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
pub const Message = union(enum(u16)) {
relay: Message.Relay = 0x003C,
connection: Message.Connection = 0x00E9,
_,
pub const Relay = message.Relay;
pub const Connection = message.Connection;
pub const Relay = struct {
dest: Dest,
checksum: [2]u8 = undefined,
payload: []const u8,
pub fn toBytes(self: message.Message, buf: []u8) []u8 {
pub const Dest = struct {
bytes: [relay_dest_len]u8,
/// Asserts bytes is less than or equal to 4 bytes
pub fn fromBytes(bytes: []const u8) Dest {
var buf: [4]u8 = @splat(0);
std.debug.assert(bytes.len <= buf.len);
@memcpy(buf[0..bytes.len], bytes);
return .{ .bytes = buf };
}
};
/// Asserts that buf is large enough to fit the relay message.
pub fn toBytes(self: Relay, buf: []u8) []u8 {
var out: Writer = .fixed(buf);
out.writeInt(u16, @intFromEnum(Message.relay), .big) catch unreachable;
out.writeInt(u16, @intCast(self.payload.len + 4), .big) catch unreachable; // Length field, but unread. Will switch to checksum
out.writeAll(&self.dest.bytes) catch unreachable;
out.writeAll(self.payload) catch unreachable;
return out.buffered();
}
// test toBytes {
// var buf: [1024]u8 = undefined;
// const relay: Relay = .init(
// .fromBytes(&.{ 172, 18, 1, 30 }),
// // zig fmt: off
// &[_]u8{
// 0x72, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x20, 0x65, 0x76, 0x65,
// 0x6e, 0x74, 0x20, 0x6c, 0x6f, 0x67, 0x67, 0x65, 0x64
// },
// // zig fmt: on
// );
// // zig fmt: off
// var expected = [_]u8{
// 0x00, 0x3c, 0x00, 0x17, 0xac, 0x12, 0x01, 0x1e, 0x72,
// 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x20, 0x65, 0x76, 0x65,
// 0x6e, 0x74, 0x20, 0x6c, 0x6f, 0x67, 0x67, 0x65, 0x64
// };
// // zig fmt: on
// try expectEqualMessageBuffers(&expected, relay.toBytes(&buf));
// }
};
pub const Connection = struct {
src: u16,
dest: u16,
seq: u32,
id: u32,
reserved: u8 = undefined,
options: Options = .{},
payload: []const u8,
/// Option values.
/// Currently used!
pub const Options = packed struct(u8) {
opt1: bool = false,
opt2: bool = false,
opt3: bool = false,
opt4: bool = false,
opt5: bool = false,
opt6: bool = false,
opt7: bool = false,
management: bool = false,
};
/// Asserts that buf is large enough to fit the connection message.
pub fn toBytes(self: Connection, buf: []u8) []u8 {
var out: Writer = .fixed(buf);
out.writeInt(u16, @intFromEnum(Message.connection), .big) catch unreachable;
out.writeInt(u16, @intCast(self.payload.len + 14), .big) catch unreachable; // Saprus length field, unread.
out.writeInt(u16, self.src, .big) catch unreachable;
out.writeInt(u16, self.dest, .big) catch unreachable;
out.writeInt(u32, self.seq, .big) catch unreachable;
out.writeInt(u32, self.id, .big) catch unreachable;
out.writeByte(self.reserved) catch unreachable;
out.writeStruct(self.options, .big) catch unreachable;
out.writeAll(self.payload) catch unreachable;
return out.buffered();
}
/// If the current message is a management message, return what kind.
/// Else return null.
pub fn management(self: Connection) ParseError!?Management {
const b64_dec = std.base64.standard.Decoder;
if (self.options.management) {
var buf: [1]u8 = undefined;
_ = b64_dec.decode(&buf, self.payload) catch return error.InvalidMessage;
return switch (buf[0]) {
'P' => .ping,
'p' => .pong,
else => error.UnknownSaprusType,
};
}
return null;
}
pub const Management = enum {
ping,
pong,
};
};
pub fn toBytes(self: Message, buf: []u8) []u8 {
return switch (self) {
inline .relay, .connection => |m| m.toBytes(buf),
else => unreachable,
};
}
pub const parse = message.parse;
};
pub const relay_dest_len = 4;
pub fn parse(bytes: []const u8) MessageParseError!Message {
var in: Reader = .fixed(bytes);
const @"type" = in.takeEnum(std.meta.Tag(Message), .big) catch |err| switch (err) {
error.InvalidEnumTag => return error.UnknownSaprusType,
else => return error.InvalidMessage,
};
const checksum = in.takeArray(2) catch return error.InvalidMessage;
switch (@"type") {
.relay => {
const dest: Relay.Dest = .fromBytes(
in.takeArray(relay_dest_len) catch return error.InvalidMessage,
);
const payload = in.buffered();
return .{
.relay = .{
.dest = dest,
.checksum = checksum.*,
.payload = payload,
},
};
},
.connection => {
const src = in.takeInt(u16, .big) catch return error.InvalidMessage;
const dest = in.takeInt(u16, .big) catch return error.InvalidMessage;
const seq = in.takeInt(u32, .big) catch return error.InvalidMessage;
const id = in.takeInt(u32, .big) catch return error.InvalidMessage;
const reserved = in.takeByte() catch return error.InvalidMessage;
const options = in.takeStruct(Connection.Options, .big) catch return error.InvalidMessage;
const payload = in.buffered();
return .{
.connection = .{
.src = src,
.dest = dest,
.seq = seq,
.id = id,
.reserved = reserved,
.options = options,
.payload = payload,
},
};
},
else => return error.NotImplementedSaprusType,
}
}
test parse {
_ = try parse(&[_]u8{ 0x00, 0x3c, 0x00, 0x17, 0xac, 0x12, 0x01, 0x1e, 0x72, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x20, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x20, 0x6c, 0x6f, 0x67, 0x67, 0x65, 0x64 });
{
const expected: Message = .{
.connection = .{
.src = 12416,
.dest = 61680,
.seq = 0,
.id = 0,
.reserved = 0,
.options = @bitCast(@as(u8, 100)),
.payload = &[_]u8{ 0x69, 0x61, 0x6d, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74 },
},
pub fn parse(bytes: []const u8) ParseError!Message {
var in: Reader = .fixed(bytes);
const @"type" = in.takeEnum(std.meta.Tag(Message), .big) catch |err| switch (err) {
error.InvalidEnumTag => return error.UnknownSaprusType,
else => return error.InvalidMessage,
};
const actual = try parse(&[_]u8{ 0x00, 0xe9, 0x00, 0x18, 0x30, 0x80, 0xf0, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x64, 0x69, 0x61, 0x6d, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74 });
try std.testing.expectEqualDeep(expected, actual);
}
}
const Relay = struct {
dest: Dest,
checksum: [2]u8 = undefined,
payload: []const u8,
pub const Dest = struct {
bytes: [relay_dest_len]u8,
/// Asserts bytes is less than or equal to 4 bytes
pub fn fromBytes(bytes: []const u8) Dest {
var buf: [4]u8 = @splat(0);
std.debug.assert(bytes.len <= buf.len);
@memcpy(buf[0..bytes.len], bytes);
return .{ .bytes = buf };
const checksum = in.takeArray(2) catch return error.InvalidMessage;
switch (@"type") {
.relay => {
const dest: Relay.Dest = .fromBytes(
in.takeArray(relay_dest_len) catch return error.InvalidMessage,
);
const payload = in.buffered();
return .{
.relay = .{
.dest = dest,
.checksum = checksum.*,
.payload = payload,
},
};
},
.connection => {
const src = in.takeInt(u16, .big) catch return error.InvalidMessage;
const dest = in.takeInt(u16, .big) catch return error.InvalidMessage;
const seq = in.takeInt(u32, .big) catch return error.InvalidMessage;
const id = in.takeInt(u32, .big) catch return error.InvalidMessage;
const reserved = in.takeByte() catch return error.InvalidMessage;
const options = in.takeStruct(Connection.Options, .big) catch return error.InvalidMessage;
const payload = in.buffered();
return .{
.connection = .{
.src = src,
.dest = dest,
.seq = seq,
.id = id,
.reserved = reserved,
.options = options,
.payload = payload,
},
};
},
else => return error.NotImplementedSaprusType,
}
}
test parse {
_ = try parse(&[_]u8{ 0x00, 0x3c, 0x00, 0x17, 0xac, 0x12, 0x01, 0x1e, 0x72, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x20, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x20, 0x6c, 0x6f, 0x67, 0x67, 0x65, 0x64 });
{
const expected: Message = .{
.connection = .{
.src = 12416,
.dest = 61680,
.seq = 0,
.id = 0,
.reserved = 0,
.options = @bitCast(@as(u8, 100)),
.payload = &[_]u8{ 0x69, 0x61, 0x6d, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74 },
},
};
const actual = try parse(&[_]u8{ 0x00, 0xe9, 0x00, 0x18, 0x30, 0x80, 0xf0, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x64, 0x69, 0x61, 0x6d, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74 });
try std.testing.expectEqualDeep(expected, actual);
}
}
test "Round trip" {
{
const expected = [_]u8{ 0x0, 0xe9, 0x0, 0x15, 0x30, 0x80, 0xf0, 0xf0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x64, 0x36, 0x3a, 0x3a, 0x64, 0x61, 0x74, 0x61 };
const msg = (try parse(&expected)).connection;
var res_buf: [expected.len + 1]u8 = undefined; // + 1 to test subslice result.
const res = msg.toBytes(&res_buf);
try expectEqualMessageBuffers(&expected, res);
}
}
// Skip checking the length / checksum, because that is undefined.
fn expectEqualMessageBuffers(expected: []const u8, actual: []const u8) !void {
try std.testing.expectEqualSlices(u8, expected[0..2], actual[0..2]);
try std.testing.expectEqualSlices(u8, expected[4..], actual[4..]);
}
pub const TypeError = error{
NotImplementedSaprusType,
UnknownSaprusType,
};
pub const ParseError = TypeError || error{
InvalidMessage,
};
pub fn init(dest: Dest, payload: []const u8) Relay {
return .{ .dest = dest, .payload = payload };
}
/// Asserts that buf is large enough to fit the relay message.
pub fn toBytes(self: Relay, buf: []u8) []u8 {
var out: Writer = .fixed(buf);
out.writeInt(u16, @intFromEnum(Message.relay), .big) catch unreachable;
out.writeInt(u16, @intCast(self.payload.len + 4), .big) catch unreachable; // Length field, but unread. Will switch to checksum
out.writeAll(&self.dest.bytes) catch unreachable;
out.writeAll(self.payload) catch unreachable;
return out.buffered();
}
test toBytes {
var buf: [1024]u8 = undefined;
const relay: Relay = .init(
.fromBytes(&.{ 172, 18, 1, 30 }),
// zig fmt: off
&[_]u8{
0x72, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x20, 0x65, 0x76, 0x65,
0x6e, 0x74, 0x20, 0x6c, 0x6f, 0x67, 0x67, 0x65, 0x64
},
// zig fmt: on
);
// zig fmt: off
var expected = [_]u8{
0x00, 0x3c, 0x00, 0x17, 0xac, 0x12, 0x01, 0x1e, 0x72,
0x65, 0x6d, 0x6f, 0x76, 0x65, 0x20, 0x65, 0x76, 0x65,
0x6e, 0x74, 0x20, 0x6c, 0x6f, 0x67, 0x67, 0x65, 0x64
};
// zig fmt: on
try expectEqualMessageBuffers(&expected, relay.toBytes(&buf));
}
};
const Connection = struct {
src: u16,
dest: u16,
seq: u32,
id: u32,
reserved: u8 = undefined,
options: Options = undefined,
payload: []const u8,
/// Reserved option values.
/// Currently unused.
pub const Options = packed struct(u8) {
opt1: bool = false,
opt2: bool = false,
opt3: bool = false,
opt4: bool = false,
opt5: bool = false,
opt6: bool = false,
opt7: bool = false,
opt8: bool = false,
};
/// Asserts that buf is large enough to fit the connection message.
pub fn toBytes(self: Connection, buf: []u8) []u8 {
var out: Writer = .fixed(buf);
out.writeInt(u16, @intFromEnum(Message.connection), .big) catch unreachable;
out.writeInt(u16, @intCast(self.payload.len + 14), .big) catch unreachable; // Saprus length field, unread.
out.writeInt(u16, self.src, .big) catch unreachable;
out.writeInt(u16, self.dest, .big) catch unreachable;
out.writeInt(u32, self.seq, .big) catch unreachable;
out.writeInt(u32, self.id, .big) catch unreachable;
out.writeByte(self.reserved) catch unreachable;
out.writeStruct(self.options, .big) catch unreachable;
out.writeAll(self.payload) catch unreachable;
return out.buffered();
}
};
test "Round trip" {
{
const expected = [_]u8{ 0x0, 0xe9, 0x0, 0x15, 0x30, 0x80, 0xf0, 0xf0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x64, 0x36, 0x3a, 0x3a, 0x64, 0x61, 0x74, 0x61 };
const msg = (try parse(&expected)).connection;
var res_buf: [expected.len + 1]u8 = undefined; // + 1 to test subslice result.
const res = msg.toBytes(&res_buf);
try expectEqualMessageBuffers(&expected, res);
}
}
// Skip checking the length / checksum, because that is undefined.
fn expectEqualMessageBuffers(expected: []const u8, actual: []const u8) !void {
try std.testing.expectEqualSlices(u8, expected[0..2], actual[0..2]);
try std.testing.expectEqualSlices(u8, expected[4..], actual[4..]);
}
const relay_dest_len = 4;
const std = @import("std");
const Allocator = std.mem.Allocator;
@@ -207,5 +234,5 @@ const Writer = std.Io.Writer;
const Reader = std.Io.Reader;
test {
std.testing.refAllDeclsRecursive(@This());
std.testing.refAllDecls(@This());
}

31
src/root.zig
View File

@@ -1,12 +1,29 @@
// Copyright 2026 Robby Zambito
//
// This file is part of zaprus.
//
// Zaprus is free software: you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// Zaprus is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with
// Zaprus. If not, see <https://www.gnu.org/licenses/>.
//! The Zaprus library is useful for implementing clients that interact with the [Saprus Protocol](https://gitlab.com/c2-games/red-team/saprus).
//!
//! The main entrypoint into this library is the `Client` type.
//! It can be used to send fire and forget messages, and establish persistent connections.
//! It is up to the consumer of this library to handle non-management message payloads.
//! The library handles management messages automatically (right now, just ping).
pub const Client = @import("Client.zig");
pub const Connection = @import("Connection.zig");
const msg = @import("message.zig");
pub const PacketType = msg.PacketType;
pub const MessageTypeError = msg.MessageTypeError;
pub const MessageParseError = msg.MessageParseError;
pub const Message = msg.Message;
pub const Message = @import("message.zig").Message;
test {
@import("std").testing.refAllDecls(@This());