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TCPd: preliminary work. Lacks actual TCP connection but switching is okay.

master
Philippe Pittoli 2023-01-11 16:34:43 +01:00
parent ba6671d902
commit 1034b1aa5c
1 changed files with 147 additions and 0 deletions

147
zig-impl/src/tcpd.zig Normal file
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const std = @import("std");
const hexdump = @import("./hexdump.zig");
const net = std.net;
const fmt = std.fmt;
const os = std.os;
const ipc = @import("./main.zig");
const Message = ipc.Message;
// Import send_fd this way in order to produce docs for exchange-fd functions.
const exchange_fd = @import("./exchange-fd.zig");
const send_fd = exchange_fd.send_fd;
const builtin = @import("builtin");
const native_os = builtin.target.os.tag;
const print = std.debug.print;
const testing = std.testing;
const print_eq = @import("./util.zig").print_eq;
const URI = @import("./util.zig").URI;
fn create_service() !void {
const config = .{.safety = true};
var gpa = std.heap.GeneralPurposeAllocator(config){};
defer _ = gpa.deinit();
const allocator = gpa.allocator();
var ctx = try ipc.Context.init(allocator);
defer ctx.deinit(); // There. Can't leak. Isn't Zig wonderful?
// SERVER SIDE: creating a service.
_ = try ctx.server_init("tcp");
// signal handler, to quit when asked
const S = struct {
var should_quit: bool = false;
fn handler(sig: i32, info: *const os.siginfo_t, _: ?*const anyopaque) callconv(.C) void {
print ("A signal has been received: {}\n", .{sig});
// Check that we received the correct signal.
switch (native_os) {
.netbsd => {
if (sig != os.SIG.HUP or sig != info.info.signo)
return;
},
else => {
if (sig != os.SIG.HUP and sig != info.signo)
return;
},
}
should_quit = true;
}
};
var sa = os.Sigaction{
.handler = .{ .sigaction = &S.handler },
.mask = os.empty_sigset, // Do not mask any signal.
.flags = os.SA.SIGINFO,
};
// Quit on SIGHUP (kill -1).
try os.sigaction(os.SIG.HUP, &sa, null);
var some_event: ipc.Event = undefined;
ctx.timer = 1000; // 1 second
var count: u32 = 0;
while(! S.should_quit) {
some_event = try ctx.wait_event();
switch (some_event.t) {
.TIMER => {
print("\rTimer! ({})", .{count});
count += 1;
},
.CONNECTION => {
print("New connection: {} so far!\n", .{ctx.pollfd.items.len});
},
.DISCONNECTION => {
print("User {} disconnected, {} remainaing.\n"
, .{some_event.origin, ctx.pollfd.items.len});
},
.EXTERNAL => {
print("Message received from a non IPC socket.\n", .{});
print("NOT IMPLEMENTED, YET. It's a suicide, then.\n", .{});
break;
},
.SWITCH_RX => {
print("Message has been received (SWITCH).\n", .{});
},
.SWITCH_TX => {
print("Message has been sent (SWITCH).\n", .{});
},
.MESSAGE => {
print("Client asking for a service through TCPd.\n", .{});
if (some_event.m) |m| {
print("{}\n", .{m});
defer m.deinit(); // Do not forget to free the message payload.
print ("URI to work with is {s}\n", .{m.payload});
var uri = URI.read(m.payload);
print ("proto [{s}] address [{s}] path [{s}]\n"
, .{uri.protocol, uri.address, uri.path});
// TODO FIXME: CURRENTLY ONLY CONNECT TO LOCAL UNIX SERVICE
// TODO: TCP!!
var servicefd = try ctx.connect_service (uri.path);
// Connection is established, inform IPCd.
var response = try Message.init(some_event.origin, allocator, "ok");
defer response.deinit();
try ctx.write(response);
// Let's switch the connections!
try ctx.add_switch(some_event.origin, servicefd);
// TODO: for real TCP code, invoke: ctx.set_switch_callbacks ();
}
else {
// TCPd was contacted without providing a message, nothing to do.
var response = try Message.init(some_event.origin, allocator, "no");
defer response.deinit();
try ctx.write(response);
try ctx.close(some_event.index);
}
},
.TX => {
print("Message sent.\n", .{});
},
.ERROR => {
print("A problem occured, event: {}, let's suicide\n", .{some_event});
break;
},
}
}
print("Goodbye\n", .{});
}
pub fn main() !u8 {
try create_service();
return 0;
}