261 lines
10 KiB
Zig
261 lines
10 KiB
Zig
const std = @import("std");
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const net = std.net;
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const fmt = std.fmt;
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const os = std.os;
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const testing = std.testing;
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const print = std.debug.print;
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const ipc = @import("ipc");
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const hexdump = ipc.hexdump;
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const Message = ipc.Message;
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// Import send_fd this way in order to produce docs for exchange-fd functions.
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const exchange_fd = ipc.exchangefd;
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const send_fd = exchange_fd.send_fd;
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const builtin = @import("builtin");
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const native_os = builtin.target.os.tag;
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const print_eq = ipc.util.print_eq;
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const URI = ipc.util.URI;
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fn init_tcp_server(allocator: std.mem.Allocator, server: *net.StreamServer) !i32 {
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var address = std.process.getEnvVarOwned(allocator, "ADDRESS") catch |err| switch(err) {
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error.EnvironmentVariableNotFound => blk: {
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print ("no ADDRESS envvar: TCPd will listen on 127.0.0.1:9000\n", .{});
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break :blk try allocator.dupe(u8, "127.0.0.1:9000");
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},
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else => { return err; },
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};
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defer allocator.free(address);
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var iterator = std.mem.split(u8, address, ":");
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var real_tcp_address = iterator.first();
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var real_tcp_port = try std.fmt.parseUnsigned(u16, iterator.rest(), 10);
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print ("TCP address [{s}] port [{}]\n", .{real_tcp_address, real_tcp_port});
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server.* = net.StreamServer.init(.{.reuse_address = true});
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var socket_addr = try net.Address.parseIp(real_tcp_address, real_tcp_port);
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try server.listen(socket_addr);
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const newfd = server.sockfd orelse return error.SocketLOL; // TODO
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return newfd;
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}
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fn create_service() !void {
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const config = .{.safety = true};
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var gpa = std.heap.GeneralPurposeAllocator(config){};
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defer _ = gpa.deinit();
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const allocator = gpa.allocator();
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var ctx = try ipc.Context.init(allocator);
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defer ctx.deinit(); // There. Can't leak. Isn't Zig wonderful?
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// SERVER SIDE: creating a service.
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var service_name = std.process.getEnvVarOwned(allocator, "IPC_SERVICE_NAME") catch |err| switch(err) {
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error.EnvironmentVariableNotFound => blk: {
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print ("no IPC_SERVICE_NAME envvar: TCPd will be named 'tcp'\n", .{});
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break :blk try allocator.dupe(u8, "tcp");
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},
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else => { return err; },
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};
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defer allocator.free(service_name);
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_ = try ctx.server_init(service_name);
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// signal handler, to quit when asked
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const S = struct {
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var should_quit: bool = false;
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fn handler(sig: i32, info: *const os.siginfo_t, _: ?*const anyopaque) callconv(.C) void {
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print ("A signal has been received: {}\n", .{sig});
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// Check that we received the correct signal.
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switch (native_os) {
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.netbsd => {
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if (sig != os.SIG.HUP or sig != info.info.signo)
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return;
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},
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else => {
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if (sig != os.SIG.HUP and sig != info.signo)
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return;
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},
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}
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should_quit = true;
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}
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};
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var sa = os.Sigaction{
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.handler = .{ .sigaction = &S.handler },
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.mask = os.empty_sigset, // Do not mask any signal.
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.flags = os.SA.SIGINFO,
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};
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// Quit on SIGHUP (kill -1).
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try os.sigaction(os.SIG.HUP, &sa, null);
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var server: net.StreamServer = undefined;
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var serverfd = try init_tcp_server(allocator, &server);
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try ctx.add_external (serverfd);
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var some_event: ipc.Event = undefined;
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var previous_event: ipc.Event.Type = ipc.Event.Type.ERROR;
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ctx.timer = 1000; // 1 second
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var count: u32 = 0;
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while(! S.should_quit) {
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some_event = try ctx.wait_event();
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// For clarity in the output.
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if (some_event.t != .TIMER and previous_event == .TIMER ) { print("\n", .{}); }
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previous_event = some_event.t;
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switch (some_event.t) {
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.TIMER => {
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print ("\rTimer! ({})", .{count});
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count += 1;
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},
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.CONNECTION => {
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print ("New connection: {} so far!\n", .{ctx.pollfd.items.len});
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},
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.DISCONNECTION => {
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print ("User {} disconnected, {} remaining.\n"
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, .{some_event.origin, ctx.pollfd.items.len});
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},
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.EXTERNAL => {
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print ("Message received from a non IPC socket.\n", .{});
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var client = try server.accept(); // net.StreamServer.Connection
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errdefer client.stream.close();
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// Receiving a new client from the EXTERNAL socket.
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// New client = new switch from a distant TCP connection to a
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// local libipc service.
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var buffer: [10000]u8 = undefined;
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var size = try client.stream.read(&buffer);
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var service_to_contact = buffer[0..size];
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if (service_to_contact.len == 0) {
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print("Error, no service provided, closing the connection.\n", .{});
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client.stream.close();
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continue;
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}
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print ("Ask to connect to service [{s}].\n", .{service_to_contact});
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var servicefd = ctx.connect_service (service_to_contact) catch |err| {
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print("Error while connecting to the service {s}: {}.\n"
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, .{service_to_contact, err});
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print ("Closing the connection.\n", .{});
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client.stream.close();
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continue;
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};
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errdefer ctx.close_fd (servicefd) catch {};
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print ("Send a message to inform remote TCPd that the connection is established.\n", .{});
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_ = try client.stream.write("ok");
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print ("Add current client as external connection (for now).\n", .{});
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try ctx.add_external (client.stream.handle);
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print ("Message sent, switching.\n", .{});
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try ctx.add_switch(client.stream.handle, servicefd);
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print ("DONE.\n", .{});
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// Some protocols will require to change the default functions
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// to read and to write on the client socket.
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// Function to call: ctx.set_switch_callbacks(clientfd, infn, outfn);
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},
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.SWITCH_RX => {
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print ("Message has been received (SWITCH fd {}).\n", .{some_event.origin});
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// if (some_event.m) |m| {
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// var hexbuf: [4000]u8 = undefined;
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// var hexfbs = std.io.fixedBufferStream(&hexbuf);
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// var hexwriter = hexfbs.writer();
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// try hexdump.hexdump(hexwriter, "Received", m.payload);
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// print("{s}\n", .{hexfbs.getWritten()});
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// }
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// else {
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// print ("Message received without actually a message?! {}", .{some_event});
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// }
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},
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.SWITCH_TX => {
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print ("Message has been sent (SWITCH fd {}).\n", .{some_event.origin});
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},
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.MESSAGE_RX => {
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print ("Client asking for a service through TCPd.\n", .{});
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errdefer ctx.close (some_event.index) catch {};
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if (some_event.m) |m| {
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defer m.deinit(); // Do not forget to free the message payload.
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print ("URI to contact {s}\n", .{m.payload});
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var uri = URI.read(m.payload);
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print ("proto [{s}] address [{s}] path [{s}]\n"
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, .{uri.protocol, uri.address, uri.path});
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var iterator = std.mem.split(u8, uri.address, ":");
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var real_tcp_address = iterator.first();
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var real_tcp_port = try std.fmt.parseUnsigned(u16, iterator.rest(), 10);
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var socket_addr = try net.Address.parseIp(real_tcp_address, real_tcp_port);
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var stream = try net.tcpConnectToAddress(socket_addr);
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errdefer stream.close();
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print ("Writing URI PATH: {s}\n", .{uri.path});
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_ = try stream.write(uri.path);
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print ("Writing URI PATH - written, waiting for the final 'ok'.\n", .{});
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var buffer: [10000]u8 = undefined;
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var size = try stream.read(&buffer);
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if (! std.mem.eql(u8, buffer[0..size], "ok")) {
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print ("didn't receive 'ok', let's kill the connection\n", .{});
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stream.close();
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try ctx.close(some_event.index);
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continue;
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}
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print ("Final 'ok' received, sending 'ok' to IPCd.\n", .{});
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// Connection is established, inform IPCd.
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var response = try Message.init(some_event.origin, allocator, "ok");
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defer response.deinit();
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try ctx.write(response);
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print ("Add current client as external connection (for now).\n", .{});
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try ctx.add_external (stream.handle);
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print ("Finally, add switching\n", .{});
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try ctx.add_switch(some_event.origin, stream.handle);
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// Could invoke ctx.set_switch_callbacks but TCP sockets are
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// working pretty well with default functions.
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}
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else {
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// TCPd was contacted without providing a message, nothing to do.
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var response = try Message.init(some_event.origin, allocator, "no");
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defer response.deinit();
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try ctx.write(response);
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try ctx.close(some_event.index);
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}
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},
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.MESSAGE_TX => {
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print ("Message sent.\n", .{});
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},
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.ERROR => {
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print ("A problem occured, event: {}, let's suicide.\n", .{some_event});
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break;
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},
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}
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}
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print ("Goodbye\n", .{});
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}
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pub fn main() !u8 {
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try create_service();
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return 0;
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}
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