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const std = @import("std");
const MetaInfo = @import("metainfo.zig");
const bencode = @import("bencode.zig");
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const a = gpa.allocator();
// open & parse the torrent file
const f = try std.fs.cwd().openFile("src/sample.torrent", .{});
defer f.close();
var fr = f.reader();
var mib = try bencode.bdecode(a, fr);
defer mib.deinit(a);
var mi = try MetaInfo.parse(a, mib);
defer mi.deinit(a);
// call the tracker...
var c = std.http.Client{
.allocator = a,
};
defer c.deinit();
var q = std.StringHashMap([]const u8).init(a);
defer q.deinit();
var info_hash = try mi.info.hash(a);
var buf_left = [_]u8{0} ** 1024;
try q.put("info_hash", &info_hash);
try q.put("peer_id", "00112233445566778899");
try q.put("port", "6881");
try q.put("uploaded", "0");
try q.put("downloaded", "0");
try q.put("left", try std.fmt.bufPrint(&buf_left, "{}", .{mi.info.files[0].length}));
try q.put("compact", "1");
var qs = try toqs(a, q);
defer a.free(qs);
var url = try std.fmt.allocPrint(a, "{s}?{s}", .{ mi.announce, qs });
defer a.free(url);
var res = try c.fetch(a, .{ .location = .{ .url = url } });
defer res.deinit();
if (res.status == .ok) {
var trb = try bencode.bdecodeBuf(a, res.body.?);
defer trb.deinit(a);
var tr = try TrackerResp.parse(a, trb);
defer tr.deinit(a);
var w = std.io.getStdOut().writer();
for (tr.peers) |peer| {
try std.fmt.format(w, "peer: {}\n", .{peer});
}
}
}
fn toqs(a: std.mem.Allocator, hm: std.StringHashMap([]const u8)) ![]const u8 {
var al = std.ArrayList(u8).init(a);
defer al.deinit();
var w = al.writer();
var it = hm.iterator();
var first = true;
while (it.next()) |entry| {
if (!first) try w.writeByte('&');
try std.Uri.writeEscapedQuery(w, entry.key_ptr.*);
try w.writeByte('=');
try std.Uri.writeEscapedQuery(w, entry.value_ptr.*);
first = false;
}
return try al.toOwnedSlice();
}
const TrackerResp = struct {
// interval: u64,
peers: []std.net.Address,
pub fn parse(a: std.mem.Allocator, b: bencode.BValue) !TrackerResp {
var ipl = std.ArrayList(std.net.Address).init(a);
defer ipl.deinit();
var d = b.asDict() catch return error.Malformatted;
var pb = d.get("peers") orelse return error.Malformatted;
var ps = pb.asString() catch return error.Malformatted;
if ((ps.len % 6) != 0) return error.Malformatted;
for (0..ps.len / 6) |ix| {
const start = ix * 6;
const port = std.mem.readInt(u16, ps[start + 4 .. start + 6][0..2], .big);
var ip = [_]u8{0} ** 4;
@memcpy(&ip, ps[start .. start + 4]);
try ipl.append(std.net.Address.initIp4(ip, port));
}
return .{
.peers = try ipl.toOwnedSlice(),
};
}
pub fn deinit(self: *TrackerResp, a: std.mem.Allocator) void {
a.free(self.peers);
}
};
test {
_ = bencode;
_ = MetaInfo;
}
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