From 4f721afcfd5db46b7d81b2ab1f9a827fec0b56cf Mon Sep 17 00:00:00 2001 From: Robby Zambito Date: Thu, 29 Jan 2026 23:13:04 -0500 Subject: [PATCH 1/4] Add GPLv3 --- LICENSE.md | 676 +++++++++++++++++++++++++++++++++++++++++++++ include/zaprus.h | 10 + src/Client.zig | 16 ++ src/Connection.zig | 16 ++ src/EthIpUdp.zig | 16 ++ src/RawSocket.zig | 16 ++ src/c_api.zig | 16 ++ src/main.zig | 16 ++ src/message.zig | 16 ++ src/root.zig | 16 ++ 10 files changed, 814 insertions(+) create mode 100644 LICENSE.md diff --git a/LICENSE.md b/LICENSE.md new file mode 100644 index 0000000..3b176db --- /dev/null +++ b/LICENSE.md @@ -0,0 +1,676 @@ +# GNU GENERAL PUBLIC LICENSE + +Version 3, 29 June 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. + + +Everyone is permitted to copy and distribute verbatim copies of this +license document, but changing it is not allowed. + +## Preamble + +The GNU General Public License is a free, copyleft license for +software and other kinds of works. + +The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom +to share and change all versions of a program--to make sure it remains +free software for all its users. We, the Free Software Foundation, use +the GNU General Public License for most of our software; it applies +also to any other work released this way by its authors. You can apply +it to your programs, too. + +When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +them if you wish), that you receive source code or can get it if you +want it, that you can change the software or use pieces of it in new +free programs, and that you know you can do these things. + +To protect your rights, we need to prevent others from denying you +these rights or asking you to surrender the rights. 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Definitions. + +"This License" refers to version 3 of the GNU General Public License. + +"Copyright" also means copyright-like laws that apply to other kinds +of works, such as semiconductor masks. + +"The Program" refers to any copyrightable work licensed under this +License. Each licensee is addressed as "you". "Licensees" and +"recipients" may be individuals or organizations. + +To "modify" a work means to copy from or adapt all or part of the work +in a fashion requiring copyright permission, other than the making of +an exact copy. The resulting work is called a "modified version" of +the earlier work or a work "based on" the earlier work. + +A "covered work" means either the unmodified Program or a work based +on the Program. + +To "propagate" a work means to do anything with it that, without +permission, would make you directly or secondarily liable for +infringement under applicable copyright law, except executing it on a +computer or modifying a private copy. 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Protecting Users' Legal Rights From Anti-Circumvention Law. + +No covered work shall be deemed part of an effective technological +measure under any applicable law fulfilling obligations under article +11 of the WIPO copyright treaty adopted on 20 December 1996, or +similar laws prohibiting or restricting circumvention of such +measures. + +When you convey a covered work, you waive any legal power to forbid +circumvention of technological measures to the extent such +circumvention is effected by exercising rights under this License with +respect to the covered work, and you disclaim any intention to limit +operation or modification of the work as a means of enforcing, against +the work's users, your or third parties' legal rights to forbid +circumvention of technological measures. + +### 4. 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Additional Terms. + +"Additional permissions" are terms that supplement the terms of this +License by making exceptions from one or more of its conditions. +Additional permissions that are applicable to the entire Program shall +be treated as though they were included in this License, to the extent +that they are valid under applicable law. If additional permissions +apply only to part of the Program, that part may be used separately +under those permissions, but the entire Program remains governed by +this License without regard to the additional permissions. + +When you convey a copy of a covered work, you may at your option +remove any additional permissions from that copy, or from any part of +it. (Additional permissions may be written to require their own +removal in certain cases when you modify the work.) 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If the Program as you +received it, or any part of it, contains a notice stating that it is +governed by this License along with a term that is a further +restriction, you may remove that term. If a license document contains +a further restriction but permits relicensing or conveying under this +License, you may add to a covered work material governed by the terms +of that license document, provided that the further restriction does +not survive such relicensing or conveying. + +If you add terms to a covered work in accord with this section, you +must place, in the relevant source files, a statement of the +additional terms that apply to those files, or a notice indicating +where to find the applicable terms. + +Additional terms, permissive or non-permissive, may be stated in the +form of a separately written license, or stated as exceptions; the +above requirements apply either way. + +### 8. Termination. + +You may not propagate or modify a covered work except as expressly +provided under this License. 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For +purposes of this definition, "control" includes the right to grant +patent sublicenses in a manner consistent with the requirements of +this License. + +Each contributor grants you a non-exclusive, worldwide, royalty-free +patent license under the contributor's essential patent claims, to +make, use, sell, offer for sale, import and otherwise run, modify and +propagate the contents of its contributor version. + +In the following three paragraphs, a "patent license" is any express +agreement or commitment, however denominated, not to enforce a patent +(such as an express permission to practice a patent or covenant not to +sue for patent infringement). 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You may not convey a covered work if you +are a party to an arrangement with a third party that is in the +business of distributing software, under which you make payment to the +third party based on the extent of your activity of conveying the +work, and under which the third party grants, to any of the parties +who would receive the covered work from you, a discriminatory patent +license (a) in connection with copies of the covered work conveyed by +you (or copies made from those copies), or (b) primarily for and in +connection with specific products or compilations that contain the +covered work, unless you entered into that arrangement, or that patent +license was granted, prior to 28 March 2007. + +Nothing in this License shall be construed as excluding or limiting +any implied license or other defenses to infringement that may +otherwise be available to you under applicable patent law. + +### 12. No Surrender of Others' Freedom. + +If conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot convey a +covered work so as to satisfy simultaneously your obligations under +this License and any other pertinent obligations, then as a +consequence you may not convey it at all. For example, if you agree to +terms that obligate you to collect a royalty for further conveying +from those to whom you convey the Program, the only way you could +satisfy both those terms and this License would be to refrain entirely +from conveying the Program. + +### 13. Use with the GNU Affero General Public License. + +Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU Affero General Public License into a single +combined work, and to convey the resulting work. The terms of this +License will continue to apply to the part which is the covered work, +but the special requirements of the GNU Affero General Public License, +section 13, concerning interaction through a network will apply to the +combination as such. + +### 14. Revised Versions of this License. + +The Free Software Foundation may publish revised and/or new versions +of the GNU General Public License from time to time. Such new versions +will be similar in spirit to the present version, but may differ in +detail to address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies that a certain numbered version of the GNU General Public +License "or any later version" applies to it, you have the option of +following the terms and conditions either of that numbered version or +of any later version published by the Free Software Foundation. If the +Program does not specify a version number of the GNU General Public +License, you may choose any version ever published by the Free +Software Foundation. + +If the Program specifies that a proxy can decide which future versions +of the GNU General Public License can be used, that proxy's public +statement of acceptance of a version permanently authorizes you to +choose that version for the Program. + +Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + +### 15. Disclaimer of Warranty. + +THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT +WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND +PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE +DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR +CORRECTION. + +### 16. Limitation of Liability. + +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. + + + Copyright (C) + + 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 . + +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: + + Copyright (C) + 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 . + +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 . + diff --git a/include/zaprus.h b/include/zaprus.h index e81383b..6638117 100644 --- a/include/zaprus.h +++ b/include/zaprus.h @@ -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 . + #ifndef ZAPRUS_H #define ZAPRUS_H diff --git a/src/Client.zig b/src/Client.zig index ae9ca66..a8170a5 100644 --- a/src/Client.zig +++ b/src/Client.zig @@ -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 . + const base64_enc = std.base64.standard.Encoder; const base64_dec = std.base64.standard.Decoder; diff --git a/src/Connection.zig b/src/Connection.zig index 95805de..90109af 100644 --- a/src/Connection.zig +++ b/src/Connection.zig @@ -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 . + socket: RawSocket, headers: EthIpUdp, connection: SaprusMessage, diff --git a/src/EthIpUdp.zig b/src/EthIpUdp.zig index 27fc611..251ed64 100644 --- a/src/EthIpUdp.zig +++ b/src/EthIpUdp.zig @@ -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 . + pub const EthIpUdp = packed struct(u336) { // 42 bytes * 8 bits = 336 // --- UDP (Last in memory, defined first for LSB->MSB) --- udp: packed struct { diff --git a/src/RawSocket.zig b/src/RawSocket.zig index 71b4e1c..5732ce9 100644 --- a/src/RawSocket.zig +++ b/src/RawSocket.zig @@ -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 . + const RawSocket = @This(); const is_debug = builtin.mode == .Debug; diff --git a/src/c_api.zig b/src/c_api.zig index 964f399..7f10c45 100644 --- a/src/c_api.zig +++ b/src/c_api.zig @@ -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 . + const std = @import("std"); const zaprus = @import("zaprus"); diff --git a/src/main.zig b/src/main.zig index 07fe9e2..d7c9a61 100644 --- a/src/main.zig +++ b/src/main.zig @@ -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 . + const is_debug = builtin.mode == .Debug; const help = diff --git a/src/message.zig b/src/message.zig index d9d1914..e8ef268 100644 --- a/src/message.zig +++ b/src/message.zig @@ -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 . + pub const MessageTypeError = error{ NotImplementedSaprusType, UnknownSaprusType, diff --git a/src/root.zig b/src/root.zig index f7efb7b..c469021 100644 --- a/src/root.zig +++ b/src/root.zig @@ -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 . + pub const Client = @import("Client.zig"); pub const Connection = @import("Connection.zig"); From daf18d35526870e39f3009b6bf9a64d0b4859b9f Mon Sep 17 00:00:00 2001 From: Robby Zambito Date: Sat, 31 Jan 2026 20:29:34 -0500 Subject: [PATCH 2/4] 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. --- src/main.zig | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/src/main.zig b/src/main.zig index d7c9a61..734357b 100644 --- a/src/main.zig +++ b/src/main.zig @@ -178,7 +178,36 @@ 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: { + 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); From 558f40213b895810a78b2bbcbdbb95e88a301fde Mon Sep 17 00:00:00 2001 From: Robby Zambito Date: Sun, 1 Feb 2026 14:29:53 -0500 Subject: [PATCH 3/4] 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. --- src/Client.zig | 17 ++++++++++++++--- src/Connection.zig | 45 +++++++++++++++++++++++++++++++++++---------- src/RawSocket.zig | 25 ++++++++++++++++++++----- src/c_api.zig | 2 +- src/main.zig | 5 +++-- src/message.zig | 32 +++++++++++++++++++++++++++----- src/root.zig | 1 - 7 files changed, 100 insertions(+), 27 deletions(-) diff --git a/src/Client.zig b/src/Client.zig index a8170a5..1709cab 100644 --- a/src/Client.zig +++ b/src/Client.zig @@ -100,7 +100,7 @@ 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, @@ -108,7 +108,7 @@ 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; }; @@ -131,7 +131,17 @@ 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); @@ -153,6 +163,7 @@ pub fn connect(self: Client, io: Io, payload: []const u8) !SaprusConnection { const RawSocket = @import("./RawSocket.zig"); const SaprusMessage = @import("message.zig").Message; +const saprusParse = @import("message.zig").parse; const SaprusConnection = @import("Connection.zig"); const EthIpUdp = @import("./EthIpUdp.zig").EthIpUdp; diff --git a/src/Connection.zig b/src/Connection.zig index 90109af..bb81c38 100644 --- a/src/Connection.zig +++ b/src/Connection.zig @@ -28,25 +28,50 @@ pub fn init(socket: RawSocket, headers: EthIpUdp, connection: SaprusMessage) Con }; } -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; +// 'p' as base64 +const pong = "cA=="; - log.debug("Payload was {s}", .{connection_res.payload}); +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; + }; - return connection_res.payload; + 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 send(self: *Connection, io: Io, buf: []const u8) !void { +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); diff --git a/src/RawSocket.zig b/src/RawSocket.zig index 5732ce9..e43a8e4 100644 --- a/src/RawSocket.zig +++ b/src/RawSocket.zig @@ -133,7 +133,7 @@ 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 { @@ -149,11 +149,26 @@ 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) @@ -161,8 +176,8 @@ 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 diff --git a/src/c_api.zig b/src/c_api.zig index 7f10c45..c2f3190 100644 --- a/src/c_api.zig +++ b/src/c_api.zig @@ -99,6 +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; } diff --git a/src/main.zig b/src/main.zig index 734357b..10dca33 100644 --- a/src/main.zig +++ b/src/main.zig @@ -191,6 +191,7 @@ pub fn main(init: std.process.Init) !void { 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"); @@ -229,7 +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; }; @@ -238,7 +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; }; diff --git a/src/message.zig b/src/message.zig index e8ef268..0c1410d 100644 --- a/src/message.zig +++ b/src/message.zig @@ -169,11 +169,11 @@ const Connection = struct { seq: u32, id: u32, reserved: u8 = undefined, - options: Options = undefined, + options: Options = .{}, payload: []const u8, - /// Reserved option values. - /// Currently unused. + /// Option values. + /// Currently used! pub const Options = packed struct(u8) { opt1: bool = false, opt2: bool = false, @@ -182,7 +182,7 @@ const Connection = struct { opt5: bool = false, opt6: bool = false, opt7: bool = false, - opt8: bool = false, + management: bool = false, }; /// Asserts that buf is large enough to fit the connection message. @@ -199,6 +199,28 @@ const Connection = struct { 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) MessageParseError!?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, + }; }; test "Round trip" { @@ -223,5 +245,5 @@ const Writer = std.Io.Writer; const Reader = std.Io.Reader; test { - std.testing.refAllDeclsRecursive(@This()); + std.testing.refAllDecls(@This()); } diff --git a/src/root.zig b/src/root.zig index c469021..aa78565 100644 --- a/src/root.zig +++ b/src/root.zig @@ -19,7 +19,6 @@ 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; From 2c9e648c2c9c487c0239760bff23a70c059f018f Mon Sep 17 00:00:00 2001 From: Robby Zambito Date: Sun, 1 Feb 2026 19:35:14 -0500 Subject: [PATCH 4/4] Clean API and add docs --- README.md | 6 + build.zig | 19 +++ src/Client.zig | 15 +- src/Connection.zig | 19 ++- src/RawSocket.zig | 7 +- src/message.zig | 383 ++++++++++++++++++++++----------------------- src/root.zig | 14 +- 7 files changed, 248 insertions(+), 215 deletions(-) create mode 100644 README.md diff --git a/README.md b/README.md new file mode 100644 index 0000000..8a308df --- /dev/null +++ b/README.md @@ -0,0 +1,6 @@ +# 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/cNaLeDz38W5ZcZs). diff --git a/build.zig b/build.zig index 1b7e474..440917f 100644 --- a/build.zig +++ b/build.zig @@ -21,6 +21,9 @@ 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 +44,22 @@ 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", diff --git a/src/Client.zig b/src/Client.zig index 1709cab..2344f83 100644 --- a/src/Client.zig +++ b/src/Client.zig @@ -14,6 +14,8 @@ // You should have received a copy of the GNU General Public License along with // Zaprus. If not, see . +//! A client is used to handle interactions with the network. + const base64_enc = std.base64.standard.Encoder; const base64_dec = std.base64.standard.Decoder; @@ -37,6 +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(); @@ -76,7 +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(); @@ -157,13 +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 = @import("message.zig").parse; +const saprusParse = SaprusMessage.parse; const SaprusConnection = @import("Connection.zig"); const EthIpUdp = @import("./EthIpUdp.zig").EthIpUdp; diff --git a/src/Connection.zig b/src/Connection.zig index bb81c38..19be710 100644 --- a/src/Connection.zig +++ b/src/Connection.zig @@ -20,17 +20,16 @@ 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", .{}); @@ -65,6 +64,10 @@ pub fn next(self: *Connection, io: Io, buf: []u8) ![]const u8 { } } +/// 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(); diff --git a/src/RawSocket.zig b/src/RawSocket.zig index e43a8e4..9561dcf 100644 --- a/src/RawSocket.zig +++ b/src/RawSocket.zig @@ -32,7 +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; diff --git a/src/message.zig b/src/message.zig index 0c1410d..4198737 100644 --- a/src/message.zig +++ b/src/message.zig @@ -14,230 +14,219 @@ // You should have received a copy of the GNU General Public License along with // Zaprus. If not, see . -pub const MessageTypeError = error{ - NotImplementedSaprusType, - UnknownSaprusType, -}; -pub const MessageParseError = MessageTypeError || error{ - InvalidMessage, -}; - -const message = @This(); - 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 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 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, + } + } -pub const relay_dest_len = 4; + 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 }); -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 .{ + { + const expected: Message = .{ .connection = .{ - .src = src, - .dest = dest, - .seq = seq, - .id = id, - .reserved = reserved, - .options = options, - .payload = payload, + .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 }, }, }; - }, - else => return error.NotImplementedSaprusType, - } -} + 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 }); -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); - } -} - -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 }; + try std.testing.expectEqualDeep(expected, actual); } - }; - - 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 = .{}, - 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) MessageParseError!?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, - }; + 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); } - return null; } - pub const Management = enum { - ping, - pong, + // 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, }; }; -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; diff --git a/src/root.zig b/src/root.zig index aa78565..2a847fc 100644 --- a/src/root.zig +++ b/src/root.zig @@ -14,14 +14,16 @@ // You should have received a copy of the GNU General Public License along with // Zaprus. If not, see . +//! 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 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());