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Jeffrey C. Ollie 2024-09-29 02:15:26 -05:00
commit 63d3d9f4a8
Signed by: jeff
GPG key ID: 6F86035A6D97044E
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.gitignore vendored Normal file
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/.zig-cache
/zig-out

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LICENSE Normal file
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MIT License
Copyright © 2004 Jeffrey C. Ollie
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# kcp-fuzzer
Simple Kitty color protocol fuzzer.
This tries to break/crash terminal emulator by sending plausible, but
random(ish) Kitty color protocol sequences to the terminal. Hopefully your
terminal doesn't crash.
The last 1 MiB of data that was produced is saved to a file named `/tmp/ksc-fuzzer-0x<timestamp>-0x<random seed>.txt`.
A seed can be specified on the command line to replay a particular sequence of
Kitty color protocol sequences.

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const std = @import("std");
pub fn build(b: *std.Build) void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const circular_buffer_dep = b.dependency("circular-buffer", .{
.target = target,
.optimize = optimize,
});
const exe = b.addExecutable(.{
.name = "kcp-fuzzer",
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
exe.root_module.addImport("circular-buffer", circular_buffer_dep.module("circular-buffer"));
b.installArtifact(exe);
const run_cmd = b.addRunArtifact(exe);
run_cmd.step.dependOn(b.getInstallStep());
if (b.args) |args| {
run_cmd.addArgs(args);
}
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
const exe_unit_tests = b.addTest(.{
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
const test_step = b.step("test", "Run unit tests");
test_step.dependOn(&run_exe_unit_tests.step);
}

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.{
.name = "kcp-fuzzer",
.version = "0.0.0",
.minimum_zig_version = "0.13.0",
.dependencies = .{
.@"circular-buffer" = .{
.url = "git+https://git.ocjtech.us/jeff/circular-buffer.git?ref=main#7c2cde8a30d6b99150d64bbca507a857064ee67c",
.hash = "1220b29e891e8c9a6d23ca01e61fcdb128ca40ed2c1961f4153e3709db9958aacc06",
},
},
.paths = .{
"build.zig",
"build.zig.zon",
"src",
"LICENSE",
"README.md",
},
}

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{
"nodes": {
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1726560853,
"narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1727348695,
"narHash": "sha256-J+PeFKSDV+pHL7ukkfpVzCOO7mBSrrpJ3svwBFABbhI=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "1925c603f17fc89f4c8f6bf6f631a802ad85d784",
"type": "github"
},
"original": {
"id": "nixpkgs",
"ref": "nixos-unstable",
"type": "indirect"
}
},
"root": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

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{
inputs = {
nixpkgs = {
url = "nixpkgs/nixos-unstable";
};
flake-utils = {
url = "github:numtide/flake-utils";
};
};
outputs = {
nixpkgs,
flake-utils,
...
}:
flake-utils.lib.eachDefaultSystem (
system: let
pkgs = import nixpkgs {
inherit system;
};
in {
devShells.default = pkgs.mkShell {
nativeBuildInputs = [
pkgs.zig_0_13
];
shellHook = ''
export name=kcp-fuzzer
'';
};
}
);
}

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const std = @import("std");
const builtin = @import("builtin");
const CircularBuffer = @import("circular-buffer").CircularBuffer;
fn sink(fd: std.posix.fd_t, done: *bool) void {
var buf: [1]u8 = undefined;
var count: usize = 0;
while (true) {
const read = std.posix.read(fd, &buf) catch {
done.* = true;
return;
};
if (read == 0) {
done.* = true;
return;
}
done.* = buf[0] == 0x03;
count +%= read;
}
}
pub fn main() !void {
const fd = try std.posix.open("/dev/tty", .{ .ACCMODE = .RDWR }, 0);
const state = try std.posix.tcgetattr(fd);
var raw = state;
// see termios(3)
raw.iflag.IGNBRK = false;
raw.iflag.BRKINT = false;
raw.iflag.PARMRK = false;
raw.iflag.ISTRIP = false;
raw.iflag.INLCR = false;
raw.iflag.IGNCR = false;
raw.iflag.ICRNL = false;
raw.iflag.IXON = false;
raw.oflag.OPOST = false;
raw.lflag.ECHO = false;
raw.lflag.ECHONL = false;
raw.lflag.ICANON = false;
raw.lflag.ISIG = false;
raw.lflag.IEXTEN = false;
raw.cflag.CSIZE = .CS8;
raw.cflag.PARENB = false;
raw.cc[@intFromEnum(std.posix.V.MIN)] = 1;
raw.cc[@intFromEnum(std.posix.V.TIME)] = 0;
try std.posix.tcsetattr(fd, .FLUSH, raw);
defer {
std.posix.tcsetattr(fd, .FLUSH, state) catch |err| {
std.log.err("couldn't restore terminal: {}", .{err});
};
if (builtin.os.tag != .macos) // closing /dev/tty may block indefinitely on macos
std.posix.close(fd);
}
var done: bool = false;
var thread = try std.Thread.spawn(.{}, sink, .{ fd, &done });
thread.detach();
var cb = CircularBuffer(u20){};
const seed = seed: {
var buf: [4096]u8 = undefined;
var fba = std.heap.FixedBufferAllocator.init(&buf);
var args = try std.process.argsWithAllocator(fba.allocator());
defer args.deinit();
_ = args.next();
while (args.next()) |arg| {
break :seed try std.fmt.parseUnsigned(u64, arg, 0);
}
var seed: u64 = undefined;
try std.posix.getrandom(std.mem.asBytes(&seed));
break :seed seed;
};
var tmp = try std.fs.openDirAbsolute("/tmp", .{});
defer tmp.close();
var prng = std.rand.DefaultPrng.init(seed);
var random = prng.random();
var fn_buf: [std.fs.max_path_bytes]u8 = undefined;
const filename = try std.fmt.bufPrint(
&fn_buf,
"kcp-fuzzer-0x{x:0>16}-0x{x:0>16}.txt",
.{
@abs(std.time.timestamp()),
seed,
},
);
var iteration: usize = 0;
while (!done) : (iteration +%= 1) {
if (iteration & 0x3ff == 0) {
_ = try std.posix.write(fd, ".");
}
var kcp_buf: [512]u8 = undefined;
var kcp_fbs = std.io.fixedBufferStream(&kcp_buf);
var kcp_writer = kcp_fbs.writer();
try kcp_writer.print("\x1b]21", .{});
for (0..random.int(u3)) |_| {
const keys = enum {
foreground,
background,
selection_background,
selection_foreground,
cursor,
cursor_text,
visual_bell,
transparent_background_color1,
transparent_background_color2,
transparent_background_color3,
transparent_background_color4,
transparent_background_color5,
transparent_background_color6,
transparent_background_color7,
transparent_background_color8,
};
try kcp_writer.print(";{s}=", .{@tagName(random.enumValue(keys))});
switch (random.enumValue(enum {
color1,
color2,
color3,
color4,
color5,
color6,
color7,
color8,
color9,
query,
empty,
})) {
.color1 => try kcp_writer.print(
"rgb:{x:0>1}/{x:0>1}/{x:0>1}",
.{
random.int(u4),
random.int(u4),
random.int(u4),
},
),
.color2 => try kcp_writer.print(
"rgb:{x:0>2}/{x:0>2}/{x:0>2}",
.{
random.int(u8),
random.int(u8),
random.int(u8),
},
),
.color3 => try kcp_writer.print(
"rgb:{x:0>3}/{x:0>3}/{x:0>3}",
.{
random.int(u12),
random.int(u12),
random.int(u12),
},
),
.color4 => try kcp_writer.print(
"rgb:{x:0>4}/{x:0>4}/{x:0>4}",
.{
random.int(u16),
random.int(u16),
random.int(u16),
},
),
.color5 => try kcp_writer.print(
"#{x:0>1}{x:0>1}{x:0>1}",
.{
random.int(u4),
random.int(u4),
random.int(u4),
},
),
.color6 => try kcp_writer.print(
"#{x:0>2}{x:0>2}{x:0>2}",
.{
random.int(u8),
random.int(u8),
random.int(u8),
},
),
.color7 => try kcp_writer.print(
"#{x:0>3}{x:0>3}{x:0>3}",
.{
random.int(u12),
random.int(u12),
random.int(u12),
},
),
.color8 => try kcp_writer.print(
"#{x:0>4}{x:0>4}{x:0>4}",
.{
random.int(u16),
random.int(u16),
random.int(u16),
},
),
.color9 => try kcp_writer.print(
"rgbi:{d:4.2}/{d:4.2}/{d:4.2}",
.{
random.float(f32),
random.float(f32),
random.float(f32),
},
),
.query => try kcp_writer.writeByte('?'),
.empty => {},
}
}
try kcp_writer.writeAll("\x1b\\");
const kcp = kcp_fbs.getWritten();
for (kcp) |c| cb.pushByte(c);
var file = try tmp.atomicFile(filename, .{});
defer file.deinit();
try cb.write(file.file.writer());
try file.finish();
_ = try std.posix.write(fd, kcp);
}
}