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Initial commit: QuiC Call server

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- PoW (Hashcash) authentication
- X.509 CA for phone number certificates (+0 XXX YYY ZZZ)
- QUIC transport (hysteria quic-go fork) with ACME TLS
- Custom append-only DB engine (from NikoGram)
- Call signaling (dial/ring/accept/reject/end)
- E2EE media relay (X25519 + ChaCha20-Poly1305)
- Brutal congestion control (from hysteria)
- Media datagram relay (Opus/VP9/H264/H265)
- Graceful shutdown
This commit is contained in:
Niko Marmeladkov 2026-06-30 12:36:08 +03:00
commit fc0caf13ef
Signed by untrusted user who does not match committer: Niko
GPG key ID: E3B955F9442D44E3
34 changed files with 4027 additions and 0 deletions
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You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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# QuiC Call
A server for audio/video calls between people. A family phone system replacement.
No WebRTC. No STUN/TURN. Everything goes through the server.
## How it works
1. Client connects via QUIC (TLS + ACME Let's Encrypt)
2. Server sends a PoW (Hashcash) challenge
3. Client solves it, sends solution with their Ed25519 public key
4. Server allocates a phone number (`+0 XXX YYY ZZZ`), issues an X.509 certificate proving ownership
5. Client can re-roll the number once per 24h
6. To call someone, dial their number — server relays media blindly (E2EE)
## Architecture
- **Transport**: QUIC (hysteria fork of quic-go) over UDP
- **TLS**: Automatic via certmagic + Cloudflare DNS-01 (ACME)
- **Auth**: Proof-of-Work (Hashcash SHA-256), no passwords
- **PKI**: Ed25519 CA, X.509 client certs with phone number as CN
- **DB**: Custom append-only frame-based engine with AES-256-GCM at-rest encryption (hash-chain integrity)
- **Signaling**: Binary varint frames over QUIC streams
- **Media relay**: Unreliable QUIC datagrams, server forwards blindly
- **Congestion control**: Brutal (CBR) from Hysteria
- **E2EE**: X25519 + HKDF + ChaCha20-Poly1305 (key exchange during signaling)
## Status
Pre-alpha. Server compiles and passes vet. No client application exists yet.
## Quick start
```bash
# Build
go build -o qccd ./cmd/qccd
# Configure
cp config.yaml.example config.yaml
# edit config.yaml — set ACME domains, email, Cloudflare API token
# Run
./qccd server
```
## Configuration
See `config.yaml.example`.
Key options:
| Field | Default | Description |
|-------|---------|-------------|
| `server.listen` | `:1963` | UDP listen address |
| `pow.difficulty` | `22` | PoW leading zero bits |
| `identity.cooldown` | `24h` | Minimum time between number re-rolls |
| `identity.prefix` | `+0` | Phone number prefix |
| `ca.key_type` | `ed25519` | CA key type |
| `relay.bandwidth_up` | `100 mbps` | Media relay upstream bandwidth |
## Dependencies
- `github.com/apernet/quic-go` — QUIC transport (Hysteria fork)
- `github.com/caddyserver/certmagic` + `github.com/libdns/cloudflare` — ACME TLS
- `golang.org/x/crypto` — X25519, ChaCha20-Poly1305, HKDF
## License
AGPL-3.0-only

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package qccd
import (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/spf13/viper"
)
func initConfig() {
if cfgFile != "" {
viper.SetConfigFile(cfgFile)
} else {
viper.SetConfigName("config")
viper.SetConfigType("yaml")
viper.AddConfigPath(".")
viper.AddConfigPath("./data")
}
viper.SetEnvPrefix("QCC")
viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
viper.AutomaticEnv()
viper.SetDefault("server.listen", ":1963")
viper.SetDefault("acme.type", "dns")
viper.SetDefault("pow.difficulty", 22)
viper.SetDefault("pow.challenge_ttl", "30s")
viper.SetDefault("identity.cooldown", "24h")
viper.SetDefault("identity.prefix", "+0")
viper.SetDefault("ca.key_type", "ed25519")
viper.SetDefault("ca.validity", "87600h")
viper.SetDefault("relay.bandwidth_up", "100 mbps")
viper.SetDefault("relay.bandwidth_down", "100 mbps")
viper.SetDefault("relay.media_timeout", "30s")
viper.SetDefault("data_dir", "./data")
viper.SetDefault("log_level", "info")
if err := viper.ReadInConfig(); err != nil {
if _, ok := err.(viper.ConfigFileNotFoundError); ok && cfgFile == "" {
fmt.Fprintln(os.Stderr, "Warning: config.yaml not found, using defaults")
} else {
fmt.Fprintf(os.Stderr, "Error reading config file: %s\n", err)
os.Exit(1)
}
}
dataDir := viper.GetString("data_dir")
if err := os.MkdirAll(filepath.Join(dataDir, "acme"), 0700); err != nil {
fmt.Fprintf(os.Stderr, "Error creating data directory: %s\n", err)
os.Exit(1)
}
}

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cmd/qccd/main.go Normal file
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package qccd
import (
"fmt"
"os"
"github.com/spf13/cobra"
)
var cfgFile string
var rootCmd = &cobra.Command{
Use: "qccd",
Short: "QuiC Call server daemon",
Long: "QuiC Call — сервер для аудио/видеозвонков с PoW аутентификацией и X.509 PKI. Замена телефонной связи.",
}
func Execute() {
if err := rootCmd.Execute(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
func init() {
cobra.OnInitialize(initConfig)
rootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "", "config file path (default ./config.yaml)")
rootCmd.AddCommand(serverCmd)
}

55
cmd/qccd/server.go Normal file
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package qccd
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
"github.com/niko/qcc/internal/config"
"github.com/niko/qcc/internal/server"
"github.com/spf13/cobra"
"go.uber.org/zap"
)
var serverCmd = &cobra.Command{
Use: "server",
Short: "Start QuiC Call server",
Run: runServer,
}
func runServer(cmd *cobra.Command, args []string) {
logger, _ := zap.NewProduction()
defer logger.Sync()
cfg := config.Load()
srv, err := server.New(cfg, logger)
if err != nil {
logger.Fatal("Failed to create server", zap.Error(err))
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
sigCh := make(chan os.Signal, 1)
signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
go func() {
sig := <-sigCh
logger.Info("Received signal, shutting down", zap.String("signal", sig.String()))
cancel()
}()
logger.Info("Starting server",
zap.String("listen", cfg.Server.Listen),
zap.Strings("domains", cfg.ACME.Domains),
)
if err := srv.Start(ctx); err != nil {
logger.Fatal("Server error", zap.Error(err))
}
fmt.Println("Server stopped gracefully")
}

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config.yaml.example Normal file
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server:
listen: ":1963"
acme:
domains: ["n1kt.ru"]
email: "admin@n1kt.ru"
ca: "letsencrypt"
type: "dns"
dns:
name: "cloudflare"
config:
cloudflare_api_token: "" # или через env: CF_API_TOKEN
pow:
difficulty: 22
challenge_ttl: 30s
identity:
cooldown: 24h
prefix: "+0"
ca:
key_type: "ed25519"
validity: 87600h # 10 лет
relay:
bandwidth_up: "100 mbps"
bandwidth_down: "100 mbps"
media_timeout: 30s
data_dir: "./data"
log_level: "info"

41
go.mod Normal file
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module github.com/niko/qcc
go 1.26
require (
github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716
github.com/caddyserver/certmagic v0.17.2
github.com/libdns/cloudflare v0.1.1
github.com/spf13/cobra v1.10.2
github.com/spf13/viper v1.21.0
go.uber.org/zap v1.24.0
golang.org/x/crypto v0.47.0
)
require (
github.com/fsnotify/fsnotify v1.9.0 // indirect
github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
github.com/inconshreveable/mousetrap v1.1.0 // indirect
github.com/pelletier/go-toml/v2 v2.2.4 // indirect
github.com/sagikazarmark/locafero v0.12.0 // indirect
github.com/spf13/afero v1.15.0 // indirect
github.com/spf13/cast v1.10.0 // indirect
github.com/spf13/pflag v1.0.10 // indirect
github.com/subosito/gotenv v1.6.0 // indirect
go.uber.org/atomic v1.11.0 // indirect
go.uber.org/multierr v1.11.0 // indirect
golang.org/x/sys v0.41.0 // indirect
golang.org/x/text v0.34.0 // indirect
)
require (
github.com/klauspost/cpuid/v2 v2.1.1 // indirect
github.com/libdns/libdns v0.2.2 // indirect
github.com/mholt/acmez v1.0.4 // indirect
github.com/miekg/dns v1.1.50 // indirect
go.yaml.in/yaml/v3 v3.0.4 // indirect
golang.org/x/mod v0.32.0 // indirect
golang.org/x/net v0.49.0 // indirect
golang.org/x/sync v0.19.0 // indirect
golang.org/x/tools v0.41.0 // indirect
)

141
go.sum Normal file
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@ -0,0 +1,141 @@
github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716 h1:J1O+xpLuJWkdYbw5JPGwBqIHs2J8tiEP7Py9lPqkN2I=
github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716/go.mod h1:Npbg8qBtAZlsAB3FWmqwlVh5jtVG6a4DlYsOylUpvzA=
github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
github.com/caddyserver/certmagic v0.17.2 h1:o30seC1T/dBqBCNNGNHWwj2i5/I/FMjBbTAhjADP3nE=
github.com/caddyserver/certmagic v0.17.2/go.mod h1:ouWUuC490GOLJzkyN35eXfV8bSbwMwSf4bdhkIxtdQE=
github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
github.com/go-viper/mapstructure/v2 v2.5.0 h1:vM5IJoUAy3d7zRSVtIwQgBj7BiWtMPfmPEgAXnvj1Ro=
github.com/go-viper/mapstructure/v2 v2.5.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
github.com/klauspost/cpuid/v2 v2.1.1 h1:t0wUqjowdm8ezddV5k0tLWVklVuvLJpoHeb4WBdydm0=
github.com/klauspost/cpuid/v2 v2.1.1/go.mod h1:RVVoqg1df56z8g3pUjL/3lE5UfnlrJX8tyFgg4nqhuY=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/libdns/cloudflare v0.1.1 h1:FVPfWwP8zZCqj268LZjmkDleXlHPlFU9KC4OJ3yn054=
github.com/libdns/cloudflare v0.1.1/go.mod h1:9VK91idpOjg6v7/WbjkEW49bSCxj00ALesIFDhJ8PBU=
github.com/libdns/libdns v0.2.2 h1:O6ws7bAfRPaBsgAYt8MDe2HcNBGC29hkZ9MX2eUSX3s=
github.com/libdns/libdns v0.2.2/go.mod h1:4Bj9+5CQiNMVGf87wjX4CY3HQJypUHRuLvlsfsZqLWQ=
github.com/mholt/acmez v1.0.4 h1:N3cE4Pek+dSolbsofIkAYz6H1d3pE+2G0os7QHslf80=
github.com/mholt/acmez v1.0.4/go.mod h1:qFGLZ4u+ehWINeJZjzPlsnjJBCPAADWTcIqE/7DAYQY=
github.com/miekg/dns v1.1.50 h1:DQUfb9uc6smULcREF09Uc+/Gd46YWqJd5DbpPE9xkcA=
github.com/miekg/dns v1.1.50/go.mod h1:e3IlAVfNqAllflbibAZEWOXOQ+Ynzk/dDozDxY7XnME=
github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/sagikazarmark/locafero v0.12.0 h1:/NQhBAkUb4+fH1jivKHWusDYFjMOOKU88eegjfxfHb4=
github.com/sagikazarmark/locafero v0.12.0/go.mod h1:sZh36u/YSZ918v0Io+U9ogLYQJ9tLLBmM4eneO6WwsI=
github.com/spf13/afero v1.15.0 h1:b/YBCLWAJdFWJTN9cLhiXXcD7mzKn9Dm86dNnfyQw1I=
github.com/spf13/afero v1.15.0/go.mod h1:NC2ByUVxtQs4b3sIUphxK0NioZnmxgyCrfzeuq8lxMg=
github.com/spf13/cast v1.10.0 h1:h2x0u2shc1QuLHfxi+cTJvs30+ZAHOGRic8uyGTDWxY=
github.com/spf13/cast v1.10.0/go.mod h1:jNfB8QC9IA6ZuY2ZjDp0KtFO2LZZlg4S/7bzP6qqeHo=
github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/spf13/pflag v1.0.10 h1:4EBh2KAYBwaONj6b2Ye1GiHfwjqyROoF4RwYO+vPwFk=
github.com/spf13/pflag v1.0.10/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/spf13/viper v1.21.0 h1:x5S+0EU27Lbphp4UKm1C+1oQO+rKx36vfCoaVebLFSU=
github.com/spf13/viper v1.21.0/go.mod h1:P0lhsswPGWD/1lZJ9ny3fYnVqxiegrlNrEmgLjbTCAY=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
go.uber.org/goleak v1.1.11 h1:wy28qYRKZgnJTxGxvye5/wgWr1EKjmUDGYox5mGlRlI=
go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
go.uber.org/mock v0.5.2 h1:LbtPTcP8A5k9WPXj54PPPbjcI4Y6lhyOZXn+VS7wNko=
go.uber.org/mock v0.5.2/go.mod h1:wLlUxC2vVTPTaE3UD51E0BGOAElKrILxhVSDYQLld5o=
go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
go.uber.org/zap v1.21.0/go.mod h1:wjWOCqI0f2ZZrJF/UufIOkiC8ii6tm1iqIsLo76RfJw=
go.uber.org/zap v1.24.0 h1:FiJd5l1UOLj0wCgbSE0rwwXHzEdAZS6hiiSnxJN/D60=
go.uber.org/zap v1.24.0/go.mod h1:2kMP+WWQ8aoFoedH3T2sq6iJ2yDWpHbP0f6MQbS9Gkg=
go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.47.0 h1:V6e3FRj+n4dbpw86FJ8Fv7XVOql7TEwpHapKoMJ/GO8=
golang.org/x/crypto v0.47.0/go.mod h1:ff3Y9VzzKbwSSEzWqJsJVBnWmRwRSHt/6Op5n9bQc4A=
golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/mod v0.32.0 h1:9F4d3PHLljb6x//jOyokMv3eX+YDeepZSEo3mFJy93c=
golang.org/x/mod v0.32.0/go.mod h1:SgipZ/3h2Ci89DlEtEXWUk/HteuRin+HHhN+WbNhguU=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/net v0.0.0-20220630215102-69896b714898/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220704084225-05e143d24a9e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/text v0.34.0 h1:oL/Qq0Kdaqxa1KbNeMKwQq0reLCCaFtqu2eNuSeNHbk=
golang.org/x/text v0.34.0/go.mod h1:homfLqTYRFyVYemLBFl5GgL/DWEiH5wcsQ5gSh1yziA=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
golang.org/x/tools v0.41.0 h1:a9b8iMweWG+S0OBnlU36rzLp20z1Rp10w+IY2czHTQc=
golang.org/x/tools v0.41.0/go.mod h1:XSY6eDqxVNiYgezAVqqCeihT4j1U2CCsqvH3WhQpnlg=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

96
internal/auth/pow.go Normal file
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@ -0,0 +1,96 @@
package auth
import (
"crypto/sha256"
"encoding/binary"
"fmt"
"math/bits"
"time"
)
type PoWChallenge struct {
ServerNonce [8]byte
Timestamp int64
Bits int
}
type PoWSolution struct {
ClientNonce [8]byte
ClientPubKey [32]byte
}
func NewChallenge(bits int) *PoWChallenge {
var nonce [8]byte
binary.BigEndian.PutUint64(nonce[:], uint64(time.Now().UnixNano()>>10))
return &PoWChallenge{
ServerNonce: nonce,
Timestamp: time.Now().UnixNano(),
Bits: bits,
}
}
func (c *PoWChallenge) Verify(solution *PoWSolution, challengeTTL time.Duration) error {
if time.Since(time.Unix(0, c.Timestamp)) > challengeTTL {
return fmt.Errorf("challenge expired")
}
hashInput := make([]byte, 32)
binary.BigEndian.PutUint64(hashInput[0:8], uint64(c.Timestamp))
copy(hashInput[8:16], c.ServerNonce[:])
copy(hashInput[16:24], solution.ClientNonce[:])
copy(hashInput[24:], solution.ClientPubKey[:])
hash := sha256.Sum256(hashInput)
leadingZeros := 0
for i := 0; i < 32; i++ {
if hash[i] == 0 {
leadingZeros += 8
} else {
leadingZeros += bits.LeadingZeros8(hash[i])
break
}
}
if leadingZeros < c.Bits {
return fmt.Errorf("insufficient PoW difficulty: got %d, need %d", leadingZeros, c.Bits)
}
return nil
}
func (c *PoWChallenge) Marshal() []byte {
buf := make([]byte, 20)
copy(buf[0:8], c.ServerNonce[:])
binary.BigEndian.PutUint64(buf[8:16], uint64(c.Timestamp))
binary.BigEndian.PutUint32(buf[16:20], uint32(c.Bits))
return buf
}
func UnmarshalChallenge(data []byte) *PoWChallenge {
if len(data) < 20 {
return nil
}
c := &PoWChallenge{}
copy(c.ServerNonce[:], data[0:8])
c.Timestamp = int64(binary.BigEndian.Uint64(data[8:16]))
c.Bits = int(binary.BigEndian.Uint32(data[16:20]))
return c
}
func MarshalSolution(nonce [8]byte, pubKey [32]byte) []byte {
buf := make([]byte, 40)
copy(buf[0:8], nonce[:])
copy(buf[8:40], pubKey[:])
return buf
}
func UnmarshalSolution(data []byte) *PoWSolution {
if len(data) < 40 {
return nil
}
s := &PoWSolution{}
copy(s.ClientNonce[:], data[0:8])
copy(s.ClientPubKey[:], data[8:40])
return s
}

150
internal/ca/ca.go Normal file
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@ -0,0 +1,150 @@
package ca
import (
"crypto"
"crypto/ed25519"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"os"
"path/filepath"
"time"
)
type CA struct {
key crypto.Signer
cert *x509.Certificate
}
func NewOrLoad(dataDir string, keyType string, validity time.Duration) (*CA, error) {
keyPath := filepath.Join(dataDir, "ca.key")
certPath := filepath.Join(dataDir, "ca.crt")
caKey, err := loadOrGenKey(keyPath, keyType)
if err != nil {
return nil, fmt.Errorf("ca key: %w", err)
}
caCert, err := loadOrGenCert(certPath, caKey, validity)
if err != nil {
return nil, fmt.Errorf("ca cert: %w", err)
}
return &CA{key: caKey, cert: caCert}, nil
}
func loadOrGenKey(path, keyType string) (crypto.Signer, error) {
if data, err := os.ReadFile(path); err == nil {
block, _ := pem.Decode(data)
if block == nil {
return nil, fmt.Errorf("invalid CA key PEM")
}
key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return key.(crypto.Signer), nil
}
var signer crypto.Signer
switch keyType {
case "ed25519":
_, priv, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
return nil, err
}
signer = priv
default:
return nil, fmt.Errorf("unsupported key type: %s", keyType)
}
b, err := x509.MarshalPKCS8PrivateKey(signer)
if err != nil {
return nil, err
}
pemData := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: b})
if err := os.WriteFile(path, pemData, 0600); err != nil {
return nil, err
}
return signer, nil
}
func loadOrGenCert(path string, key crypto.Signer, validity time.Duration) (*x509.Certificate, error) {
if data, err := os.ReadFile(path); err == nil {
block, _ := pem.Decode(data)
if block == nil {
return nil, fmt.Errorf("invalid CA cert PEM")
}
return x509.ParseCertificate(block.Bytes)
}
pub := key.Public()
serial, _ := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
now := time.Now()
template := &x509.Certificate{
SerialNumber: serial,
Subject: pkix.Name{
CommonName: "QuiC Call Root CA",
},
NotBefore: now,
NotAfter: now.Add(validity),
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true,
IsCA: true,
MaxPathLenZero: true,
}
certDER, err := x509.CreateCertificate(rand.Reader, template, template, pub, key)
if err != nil {
return nil, err
}
pemData := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
if err := os.WriteFile(path, pemData, 0644); err != nil {
return nil, err
}
return x509.ParseCertificate(certDER)
}
func (ca *CA) IssueCert(commonName string, pub crypto.PublicKey, validity time.Duration) ([]byte, error) {
serial, _ := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
now := time.Now()
template := &x509.Certificate{
SerialNumber: serial,
Subject: pkix.Name{
CommonName: commonName,
Organization: []string{"QuiC Call"},
},
NotBefore: now,
NotAfter: now.Add(validity),
KeyUsage: x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{
x509.ExtKeyUsageClientAuth,
},
}
certDER, err := x509.CreateCertificate(rand.Reader, template, ca.cert, pub, ca.key)
if err != nil {
return nil, fmt.Errorf("create cert: %w", err)
}
return certDER, nil
}
func (ca *CA) CAKey() crypto.Signer {
return ca.key
}
func (ca *CA) CACert() *x509.Certificate {
return ca.cert
}
func (ca *CA) CACertPEM() []byte {
return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: ca.cert.Raw})
}

322
internal/call/signaling.go Normal file
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@ -0,0 +1,322 @@
package call
import (
"encoding/binary"
"sync"
"time"
"github.com/apernet/quic-go"
"go.uber.org/zap"
"github.com/niko/qcc/internal/protocol"
"github.com/niko/qcc/pkg/types"
)
type CallSession interface {
Number() string
PubKey() [32]byte
Stream() protocol.FrameReadWriter
Conn() *quic.Conn
SetCallID(id uint64)
CallID() uint64
ClearCall()
IsAuthenticated() bool
}
type SessionRegistry interface {
GetByNumber(number string) CallSession
GetAll() []CallSession
Register(sess CallSession, number string)
Unregister(number string)
}
type BrutalApplier func(conn *quic.Conn, bps uint64)
type Manager struct {
mu sync.RWMutex
calls map[uint64]*Call
userCalls map[string]uint64
nextCallID uint64
logger *zap.Logger
sessions SessionRegistry
mediaTimeout time.Duration
brutalBPS uint64
applyBrutal BrutalApplier
stopCh chan struct{}
}
type Call struct {
ID uint64
From string
To string
FromSess CallSession
ToSess CallSession
StartedAt int64
Active bool
FromE2EEKey [32]byte
ToE2EEKey [32]byte
}
func NewManager(logger *zap.Logger, sessions SessionRegistry, mediaTimeout time.Duration, brutalBPS uint64, applyBrutal BrutalApplier) *Manager {
m := &Manager{
calls: make(map[uint64]*Call),
userCalls: make(map[string]uint64),
nextCallID: 1,
logger: logger,
sessions: sessions,
mediaTimeout: mediaTimeout,
brutalBPS: brutalBPS,
applyBrutal: applyBrutal,
stopCh: make(chan struct{}),
}
go m.cleanupLoop()
return m
}
func (m *Manager) cleanupLoop() {
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
m.cleanupStale()
case <-m.stopCh:
return
}
}
}
func (m *Manager) Stop() {
close(m.stopCh)
}
func (m *Manager) cleanupStale() {
m.mu.Lock()
defer m.mu.Unlock()
for id, call := range m.calls {
if !call.Active && time.Since(time.Unix(0, call.StartedAt)) > m.mediaTimeout {
delete(m.calls, id)
delete(m.userCalls, call.From)
delete(m.userCalls, call.To)
}
}
}
func parseDialPayload(payload []byte) (targetNumber string, e2eePubKey [32]byte) {
if len(payload) < 1 {
return "", [32]byte{}
}
numLen := int(payload[0])
if len(payload) < 1+numLen+32 {
return "", [32]byte{}
}
targetNumber = string(payload[1 : 1+numLen])
copy(e2eePubKey[:], payload[1+numLen:1+numLen+32])
return targetNumber, e2eePubKey
}
func marshalRingPayload(number string, e2eePubKey [32]byte) []byte {
buf := make([]byte, 1+len(number)+32)
buf[0] = byte(len(number))
copy(buf[1:], number)
copy(buf[1+len(number):], e2eePubKey[:])
return buf
}
func (m *Manager) HandleDial(sess CallSession, payload []byte) {
targetNumber, callerE2EE := parseDialPayload(payload)
if targetNumber == "" {
sendError(sess, types.ErrInvalidRequest, "empty target number")
return
}
fromNumber := sess.Number()
if fromNumber == targetNumber {
sendError(sess, types.ErrSelfCall, "cannot call yourself")
return
}
m.mu.Lock()
if _, busy := m.userCalls[fromNumber]; busy {
m.mu.Unlock()
sendError(sess, types.ErrBusy, "you already have an active call")
return
}
targetSess := m.sessions.GetByNumber(targetNumber)
if targetSess == nil {
m.mu.Unlock()
sendError(sess, types.ErrNumberNotFound, "target offline")
return
}
if _, busy := m.userCalls[targetNumber]; busy {
m.mu.Unlock()
sendError(sess, types.ErrBusy, "target is busy")
return
}
callID := m.nextCallID
m.nextCallID++
call := &Call{
ID: callID,
From: fromNumber,
To: targetNumber,
FromSess: sess,
ToSess: targetSess,
StartedAt: time.Now().UnixNano(),
FromE2EEKey: callerE2EE,
}
m.calls[callID] = call
m.userCalls[fromNumber] = callID
m.userCalls[targetNumber] = callID
m.mu.Unlock()
sess.SetCallID(callID)
targetSess.SetCallID(callID)
ringPayload := marshalRingPayload(fromNumber, callerE2EE)
if st := targetSess.Stream(); st != nil {
st.WriteFrame(byte(types.OpRing), ringPayload)
}
m.logger.Info("Call initiated",
zap.Uint64("call_id", callID),
zap.String("from", fromNumber),
zap.String("to", targetNumber))
}
func (m *Manager) HandleAccept(sess CallSession, payload []byte) {
callID := sess.CallID()
if callID == 0 {
sendError(sess, types.ErrCallNotFound, "no active call")
return
}
var calleeE2EE [32]byte
if len(payload) >= 32 {
copy(calleeE2EE[:], payload[:32])
}
m.mu.Lock()
call, exists := m.calls[callID]
if !exists {
m.mu.Unlock()
sendError(sess, types.ErrCallNotFound, "call not found")
return
}
call.ToE2EEKey = calleeE2EE
call.Active = true
m.mu.Unlock()
if m.brutalBPS > 0 && m.applyBrutal != nil {
if c := call.FromSess.Conn(); c != nil {
m.applyBrutal(c, m.brutalBPS)
}
if c := call.ToSess.Conn(); c != nil {
m.applyBrutal(c, m.brutalBPS)
}
}
peerPayload := make([]byte, 32)
copy(peerPayload, calleeE2EE[:])
if st := call.FromSess.Stream(); st != nil {
st.WriteFrame(byte(types.OpPeerAccept), peerPayload)
}
m.logger.Info("Call accepted",
zap.Uint64("call_id", callID),
zap.Bool("e2ee", calleeE2EE != [32]byte{}))
}
func (m *Manager) HandleReject(sess CallSession, _ []byte) {
m.endCall(sess, false)
}
func (m *Manager) HandleEnd(sess CallSession, _ []byte) {
m.endCall(sess, true)
}
func (m *Manager) endCall(sess CallSession, notify bool) {
callID := sess.CallID()
if callID == 0 {
return
}
m.mu.Lock()
call, exists := m.calls[callID]
if !exists {
m.mu.Unlock()
return
}
delete(m.calls, callID)
delete(m.userCalls, call.From)
delete(m.userCalls, call.To)
m.mu.Unlock()
sess.ClearCall()
var otherSess CallSession
if sess == call.FromSess {
otherSess = call.ToSess
} else {
otherSess = call.FromSess
}
if otherSess != nil {
otherSess.ClearCall()
if notify {
if st := otherSess.Stream(); st != nil {
st.WriteFrame(byte(types.OpPeerEnd), nil)
}
}
}
m.logger.Info("Call ended",
zap.Uint64("call_id", callID))
}
func (m *Manager) GetCall(callID uint64) *Call {
m.mu.RLock()
defer m.mu.RUnlock()
return m.calls[callID]
}
func (m *Manager) RelayMedia(sender *quic.Conn, data []byte) {
pkt, ok := protocol.UnmarshalMediaPacket(data)
if !ok {
return
}
m.mu.RLock()
call, exists := m.calls[pkt.CallID]
m.mu.RUnlock()
if !exists || !call.Active {
return
}
var target *quic.Conn
if sender == call.FromSess.Conn() {
target = call.ToSess.Conn()
} else if sender == call.ToSess.Conn() {
target = call.FromSess.Conn()
} else {
return
}
if err := target.SendDatagram(data); err != nil {
m.logger.Warn("Failed to relay media datagram",
zap.Uint64("call_id", pkt.CallID),
zap.Error(err))
}
}
func sendError(sess CallSession, code types.ErrorCode, msg string) {
payload := make([]byte, 2+len(msg))
binary.BigEndian.PutUint16(payload[0:2], uint16(code))
copy(payload[2:], msg)
if st := sess.Stream(); st != nil {
st.WriteFrame(byte(types.OpError), payload)
}
}

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internal/config/config.go Normal file
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package config
import (
"time"
"github.com/spf13/viper"
)
type Config struct {
Server ServerConfig `mapstructure:"server"`
ACME ACMEConfig `mapstructure:"acme"`
PoW PoWConfig `mapstructure:"pow"`
Identity IdentityConfig `mapstructure:"identity"`
CA CAConfig `mapstructure:"ca"`
Relay RelayConfig `mapstructure:"relay"`
DataDir string `mapstructure:"data_dir"`
LogLevel string `mapstructure:"log_level"`
}
type ServerConfig struct {
Listen string `mapstructure:"listen"`
}
type ACMEConfig struct {
Domains []string `mapstructure:"domains"`
Email string `mapstructure:"email"`
CA string `mapstructure:"ca"`
Type string `mapstructure:"type"`
DNS ACMEDNSConfig `mapstructure:"dns"`
}
type ACMEDNSConfig struct {
Name string `mapstructure:"name"`
Config map[string]string `mapstructure:"config"`
}
type PoWConfig struct {
Difficulty int `mapstructure:"difficulty"`
ChallengeTTL time.Duration `mapstructure:"challenge_ttl"`
}
type IdentityConfig struct {
Cooldown time.Duration `mapstructure:"cooldown"`
Prefix string `mapstructure:"prefix"`
}
type CAConfig struct {
KeyType string `mapstructure:"key_type"`
Validity time.Duration `mapstructure:"validity"`
}
type RelayConfig struct {
BandwidthUp string `mapstructure:"bandwidth_up"`
BandwidthDown string `mapstructure:"bandwidth_down"`
MediaTimeout time.Duration `mapstructure:"media_timeout"`
}
func Load() *Config {
cfg := &Config{}
if err := viper.Unmarshal(cfg); err != nil {
panic(err)
}
return cfg
}

144
internal/congestion/brutal/brutal.go Normal file
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package brutal
import (
"time"
"github.com/apernet/quic-go/congestion"
"github.com/apernet/quic-go/monotime"
"github.com/niko/qcc/internal/congestion/common"
)
const (
pktInfoSlotCount = 5
minSampleCount = 50
minAckRate = 0.8
congestionWindowMultiplier = 2
)
var _ congestion.CongestionControl = &BrutalSender{}
type BrutalSender struct {
rttStats congestion.RTTStatsProvider
bps congestion.ByteCount
maxDatagramSize congestion.ByteCount
pacer *common.Pacer
pktInfoSlots [pktInfoSlotCount]pktInfo
ackRate float64
}
type pktInfo struct {
Timestamp int64
AckCount uint64
LossCount uint64
}
func NewBrutalSender(bps uint64) *BrutalSender {
bs := &BrutalSender{
bps: congestion.ByteCount(bps),
maxDatagramSize: congestion.InitialPacketSize,
ackRate: 1,
}
bs.pacer = common.NewPacer(func() congestion.ByteCount {
return congestion.ByteCount(float64(bs.bps) / bs.ackRate)
})
return bs
}
func (b *BrutalSender) SetRTTStatsProvider(rttStats congestion.RTTStatsProvider) {
b.rttStats = rttStats
}
func (b *BrutalSender) TimeUntilSend(bytesInFlight congestion.ByteCount) monotime.Time {
return b.pacer.TimeUntilSend()
}
func (b *BrutalSender) HasPacingBudget(now monotime.Time) bool {
return b.pacer.Budget(now) >= b.maxDatagramSize
}
func (b *BrutalSender) CanSend(bytesInFlight congestion.ByteCount) bool {
return bytesInFlight <= b.GetCongestionWindow()
}
func (b *BrutalSender) GetCongestionWindow() congestion.ByteCount {
rtt := b.rttStats.SmoothedRTT()
if rtt <= 0 {
return 10240
}
cwnd := congestion.ByteCount(float64(b.bps) * rtt.Seconds() * congestionWindowMultiplier / b.ackRate)
if cwnd < b.maxDatagramSize {
cwnd = b.maxDatagramSize
}
return cwnd
}
func (b *BrutalSender) OnPacketSent(sentTime monotime.Time, bytesInFlight congestion.ByteCount,
packetNumber congestion.PacketNumber, bytes congestion.ByteCount, isRetransmittable bool,
) {
b.pacer.SentPacket(sentTime, bytes)
}
func (b *BrutalSender) OnPacketAcked(number congestion.PacketNumber, ackedBytes congestion.ByteCount,
priorInFlight congestion.ByteCount, eventTime monotime.Time,
) {
}
func (b *BrutalSender) OnCongestionEvent(number congestion.PacketNumber, lostBytes congestion.ByteCount,
priorInFlight congestion.ByteCount,
) {
}
func (b *BrutalSender) OnCongestionEventEx(priorInFlight congestion.ByteCount, eventTime monotime.Time, ackedPackets []congestion.AckedPacketInfo, lostPackets []congestion.LostPacketInfo) {
currentTimestamp := int64(time.Duration(eventTime) / time.Second)
slot := currentTimestamp % pktInfoSlotCount
if b.pktInfoSlots[slot].Timestamp == currentTimestamp {
b.pktInfoSlots[slot].LossCount += uint64(len(lostPackets))
b.pktInfoSlots[slot].AckCount += uint64(len(ackedPackets))
} else {
b.pktInfoSlots[slot].Timestamp = currentTimestamp
b.pktInfoSlots[slot].AckCount = uint64(len(ackedPackets))
b.pktInfoSlots[slot].LossCount = uint64(len(lostPackets))
}
b.updateAckRate(currentTimestamp)
}
func (b *BrutalSender) SetMaxDatagramSize(size congestion.ByteCount) {
b.maxDatagramSize = size
b.pacer.SetMaxDatagramSize(size)
}
func (b *BrutalSender) updateAckRate(currentTimestamp int64) {
minTimestamp := currentTimestamp - pktInfoSlotCount
var ackCount, lossCount uint64
for _, info := range b.pktInfoSlots {
if info.Timestamp < minTimestamp {
continue
}
ackCount += info.AckCount
lossCount += info.LossCount
}
if ackCount+lossCount < minSampleCount {
b.ackRate = 1
return
}
rate := float64(ackCount) / float64(ackCount+lossCount)
if rate < minAckRate {
b.ackRate = minAckRate
return
}
b.ackRate = rate
}
func (b *BrutalSender) InSlowStart() bool {
return false
}
func (b *BrutalSender) InRecovery() bool {
return false
}
func (b *BrutalSender) MaybeExitSlowStart() {}
func (b *BrutalSender) OnRetransmissionTimeout(packetsRetransmitted bool) {}

74
internal/congestion/common/pacer.go Normal file
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package common
import (
"time"
"github.com/apernet/quic-go/congestion"
"github.com/apernet/quic-go/monotime"
)
const (
maxBurstPackets = 10
maxBurstPacingDelayMultiplier = 4
)
type Pacer struct {
budgetAtLastSent congestion.ByteCount
maxDatagramSize congestion.ByteCount
lastSentTime monotime.Time
getBandwidth func() congestion.ByteCount
}
func NewPacer(getBandwidth func() congestion.ByteCount) *Pacer {
p := &Pacer{
budgetAtLastSent: maxBurstPackets * congestion.InitialPacketSize,
maxDatagramSize: congestion.InitialPacketSize,
getBandwidth: getBandwidth,
}
return p
}
func (p *Pacer) SentPacket(sendTime monotime.Time, size congestion.ByteCount) {
budget := p.Budget(sendTime)
if size > budget {
p.budgetAtLastSent = 0
} else {
p.budgetAtLastSent = budget - size
}
p.lastSentTime = sendTime
}
func (p *Pacer) Budget(now monotime.Time) congestion.ByteCount {
if p.lastSentTime.IsZero() {
return p.maxBurstSize()
}
budget := p.budgetAtLastSent + (p.getBandwidth()*congestion.ByteCount(now.Sub(p.lastSentTime).Nanoseconds()))/1e9
if budget < 0 {
budget = congestion.ByteCount(1<<62 - 1)
}
return min(p.maxBurstSize(), budget)
}
func (p *Pacer) maxBurstSize() congestion.ByteCount {
return max(
congestion.ByteCount((maxBurstPacingDelayMultiplier*congestion.MinPacingDelay).Nanoseconds())*p.getBandwidth()/1e9,
maxBurstPackets*p.maxDatagramSize,
)
}
func (p *Pacer) TimeUntilSend() monotime.Time {
if p.budgetAtLastSent >= p.maxDatagramSize {
return 0
}
diff := 1e9 * uint64(p.maxDatagramSize-p.budgetAtLastSent)
bw := uint64(p.getBandwidth())
d := diff / bw
if diff%bw > 0 {
d++
}
return p.lastSentTime.Add(max(congestion.MinPacingDelay, time.Duration(d)*time.Nanosecond))
}
func (p *Pacer) SetMaxDatagramSize(s congestion.ByteCount) {
p.maxDatagramSize = s
}

43
internal/crypto/atrest.go Normal file
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package crypto
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"io"
)
func EncryptRecord(plaintext []byte, key [32]byte) (nonce [12]byte, ciphertext []byte, authTag []byte, err error) {
block, err := aes.NewCipher(key[:])
if err != nil {
return nonce, nil, nil, err
}
aead, err := cipher.NewGCM(block)
if err != nil {
return nonce, nil, nil, err
}
_, err = io.ReadFull(rand.Reader, nonce[:])
if err != nil {
return nonce, nil, nil, err
}
sealed := aead.Seal(nil, nonce[:], plaintext, nil)
tagStart := len(sealed) - aead.Overhead()
ciphertext = sealed[:tagStart]
authTag = sealed[tagStart:]
return nonce, ciphertext, authTag, nil
}
func DecryptRecord(ciphertext []byte, nonce [12]byte, authTag []byte, key [32]byte) ([]byte, error) {
block, err := aes.NewCipher(key[:])
if err != nil {
return nil, err
}
aead, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
sealed := make([]byte, len(ciphertext)+len(authTag))
copy(sealed, ciphertext)
copy(sealed[len(ciphertext):], authTag)
return aead.Open(nil, nonce[:], sealed, nil)
}

74
internal/crypto/e2ee.go Normal file
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package crypto
import (
"crypto/rand"
"crypto/sha256"
"io"
"golang.org/x/crypto/chacha20poly1305"
"golang.org/x/crypto/curve25519"
"golang.org/x/crypto/hkdf"
)
type E2EEKeypair struct {
PrivateKey [32]byte
PublicKey [32]byte
}
func GenerateE2EEKeypair() (*E2EEKeypair, error) {
priv := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, priv); err != nil {
return nil, err
}
// Clamp for X25519
priv[0] &= 248
priv[31] &= 127
priv[31] |= 64
pub, err := curve25519.X25519(priv, curve25519.Basepoint)
if err != nil {
return nil, err
}
var privArr [32]byte
var pubArr [32]byte
copy(privArr[:], priv)
copy(pubArr[:], pub)
return &E2EEKeypair{PrivateKey: privArr, PublicKey: pubArr}, nil
}
func DeriveE2EEKey(privateKey, publicKey [32]byte) []byte {
shared, _ := curve25519.X25519(privateKey[:], publicKey[:])
salt := make([]byte, 32)
info := []byte("qcc-e2ee-media-key")
hkdf := hkdf.New(sha256.New, shared, salt, info)
key := make([]byte, 32)
if _, err := io.ReadFull(hkdf, key); err != nil {
return nil
}
return key
}
func EncryptE2EE(key []byte, plaintext []byte) ([]byte, error) {
aead, err := chacha20poly1305.New(key)
if err != nil {
return nil, err
}
nonce := make([]byte, chacha20poly1305.NonceSizeX)
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
return nil, err
}
return aead.Seal(nonce, nonce, plaintext, nil), nil
}
func DecryptE2EE(key []byte, ciphertext []byte) ([]byte, error) {
aead, err := chacha20poly1305.New(key)
if err != nil {
return nil, err
}
if len(ciphertext) < chacha20poly1305.NonceSizeX {
return nil, io.ErrUnexpectedEOF
}
nonce := ciphertext[:chacha20poly1305.NonceSizeX]
return aead.Open(nil, nonce, ciphertext[chacha20poly1305.NonceSizeX:], nil)
}

242
internal/identity/manager.go Normal file
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package identity
import (
"encoding/binary"
"fmt"
"time"
"go.uber.org/zap"
"github.com/niko/qcc/internal/store"
"github.com/niko/qcc/pkg/types"
"golang.org/x/crypto/blake2b"
)
type Identity struct {
Number string
PubKey [32]byte
CertDER []byte
CreatedAt int64
LastReroll int64
}
type Manager struct {
store *store.Table
masterKey [32]byte
logger *zap.Logger
prefix string
cooldown time.Duration
}
func NewManager(engine *store.Engine, masterKey [32]byte, prefix string, cooldown time.Duration, logger *zap.Logger) (*Manager, error) {
t, err := engine.GetTable("identities")
if err != nil {
return nil, fmt.Errorf("get identities table: %w", err)
}
store.SetMasterKey(masterKey)
return &Manager{
store: t,
masterKey: masterKey,
logger: logger,
prefix: prefix,
cooldown: cooldown,
}, nil
}
func (m *Manager) Allocate(pubKey [32]byte) (*Identity, error) {
var number string
for attempts := 0; attempts < 100; attempts++ {
number = GenerateNumber(m.prefix)
keyHash := numberKeyHash(number)
if !m.store.Has(keyHash) {
break
}
}
keyHash := numberKeyHash(number)
if m.store.Has(keyHash) {
return nil, fmt.Errorf("failed to generate unique number")
}
now := time.Now().UnixNano()
ident := &Identity{
Number: number,
PubKey: pubKey,
CreatedAt: now,
LastReroll: now,
}
payload := m.marshalIdentity(ident)
if err := m.store.Insert(keyHash, types.RecIdentity, 0, payload, m.masterKey); err != nil {
return nil, fmt.Errorf("store identity: %w", err)
}
return ident, nil
}
func (m *Manager) Reroll(pubKey [32]byte) (*Identity, error) {
var foundIdent *Identity
var foundHash uint64
err := m.store.Iterate(func(keyHash uint64, payload []byte) bool {
ident := m.unmarshalIdentity(payload)
if ident != nil && ident.PubKey == pubKey {
foundIdent = ident
foundHash = keyHash
return false
}
return true
}, m.masterKey)
if err != nil {
return nil, err
}
if foundIdent == nil {
return nil, fmt.Errorf("identity not found for pubkey")
}
elapsed := time.Since(time.Unix(0, foundIdent.LastReroll))
if elapsed < m.cooldown {
retryAfter := m.cooldown - elapsed
return nil, &CooldownError{RetryAfter: retryAfter}
}
m.store.Delete(foundHash)
number := GenerateNumber(m.prefix)
keyHash := numberKeyHash(number)
now := time.Now().UnixNano()
newIdent := &Identity{
Number: number,
PubKey: pubKey,
CreatedAt: foundIdent.CreatedAt,
LastReroll: now,
}
payload := m.marshalIdentity(newIdent)
if err := m.store.Insert(keyHash, types.RecIdentity, 0, payload, m.masterKey); err != nil {
return nil, err
}
return newIdent, nil
}
func (m *Manager) GetByNumber(number string) (*Identity, error) {
keyHash := numberKeyHash(number)
payload, err := m.store.Get(keyHash, m.masterKey)
if err != nil {
return nil, fmt.Errorf("identity not found: %s", number)
}
ident := m.unmarshalIdentity(payload)
if ident == nil {
return nil, fmt.Errorf("invalid identity data")
}
return ident, nil
}
func (m *Manager) Exists(number string) bool {
return m.store.Has(numberKeyHash(number))
}
func numberKeyHash(number string) uint64 {
h, _ := blake2b.New(8, nil)
h.Write([]byte(number))
return binary.BigEndian.Uint64(h.Sum(nil))
}
func (m *Manager) marshalIdentity(ident *Identity) []byte {
buf := make([]byte, 8+32+2+len(ident.CertDER)+8+8)
off := 0
PutString(buf, &off, ident.Number)
copy(buf[off:off+32], ident.PubKey[:])
off += 32
PutBytes(buf, &off, ident.CertDER)
binary.BigEndian.PutUint64(buf[off:off+8], uint64(ident.CreatedAt))
off += 8
binary.BigEndian.PutUint64(buf[off:off+8], uint64(ident.LastReroll))
return buf
}
func (m *Manager) unmarshalIdentity(data []byte) *Identity {
if len(data) < 50 {
return nil
}
ident := &Identity{}
off := 0
number, ok := GetString(data, &off)
if !ok {
return nil
}
ident.Number = number
if off+32 > len(data) {
return nil
}
copy(ident.PubKey[:], data[off:off+32])
off += 32
certDER, ok := GetBytes(data, &off)
if !ok {
return nil
}
ident.CertDER = certDER
if off+16 > len(data) {
return nil
}
ident.CreatedAt = int64(binary.BigEndian.Uint64(data[off:]))
off += 8
ident.LastReroll = int64(binary.BigEndian.Uint64(data[off:]))
return ident
}
type CooldownError struct {
RetryAfter time.Duration
}
func (e *CooldownError) Error() string {
return fmt.Sprintf("cooldown: retry after %s", e.RetryAfter)
}
func PutString(buf []byte, off *int, s string) {
l := len(s)
binary.BigEndian.PutUint16(buf[*off:*off+2], uint16(l))
*off += 2
copy(buf[*off:*off+l], s)
*off += l
}
func GetString(data []byte, off *int) (string, bool) {
if *off+2 > len(data) {
return "", false
}
l := int(binary.BigEndian.Uint16(data[*off:]))
*off += 2
if *off+l > len(data) {
return "", false
}
s := string(data[*off : *off+l])
*off += l
return s, true
}
func PutBytes(buf []byte, off *int, b []byte) {
l := len(b)
binary.BigEndian.PutUint16(buf[*off:*off+2], uint16(l))
*off += 2
copy(buf[*off:*off+l], b)
*off += l
}
func GetBytes(data []byte, off *int) ([]byte, bool) {
if *off+2 > len(data) {
return nil, false
}
l := int(binary.BigEndian.Uint16(data[*off:]))
*off += 2
if *off+l > len(data) {
return nil, false
}
b := make([]byte, l)
copy(b, data[*off:*off+l])
*off += l
return b, true
}

40
internal/identity/number.go Normal file
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package identity
import (
"crypto/rand"
"fmt"
"math/big"
"strings"
)
func GenerateNumber(prefix string) string {
n1 := randInt(100, 999)
n2 := randInt(100, 999)
n3 := randInt(1000, 9999)
return fmt.Sprintf("%s %d %d %d", prefix, n1, n2, n3)
}
func randInt(min, max int) int {
n, _ := rand.Int(rand.Reader, big.NewInt(int64(max-min+1)))
return min + int(n.Int64())
}
func NormalizeNumber(s string) string {
s = strings.TrimSpace(s)
parts := strings.Fields(s)
if len(parts) == 4 && strings.HasPrefix(parts[0], "+") {
return fmt.Sprintf("%s %s %s %s", parts[0], parts[1], parts[2], parts[3])
}
return s
}
func ValidateNumber(s string) bool {
parts := strings.Fields(s)
if len(parts) != 4 {
return false
}
if len(parts[0]) < 2 || parts[0][0] != '+' {
return false
}
return true
}

119
internal/protocol/frame.go Normal file
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package protocol
import (
"encoding/binary"
"fmt"
"io"
)
type FrameReadWriter interface {
ReadFrame() (*Frame, error)
WriteFrame(opCode byte, payload []byte) error
}
const maxFramePayloadSize = 1 << 24
type Frame struct {
OpCode byte
Payload []byte
}
func EncodeFrame(opCode byte, payload []byte) []byte {
payloadLen := uint64(len(payload))
buf := make([]byte, 1+varintLen(payloadLen)+len(payload))
buf[0] = opCode
off := 1
off += encodeVarint(buf[off:], uint64(payloadLen))
copy(buf[off:], payload)
return buf
}
func ReadFrame(r io.Reader) (*Frame, error) {
opBuf := make([]byte, 1)
if _, err := io.ReadFull(r, opBuf); err != nil {
return nil, fmt.Errorf("read opcode: %w", err)
}
opCode := opBuf[0]
payloadLen, err := readVarint(r)
if err != nil {
return nil, fmt.Errorf("read payload length: %w", err)
}
if payloadLen > maxFramePayloadSize {
return nil, fmt.Errorf("payload too large: %d", payloadLen)
}
payload := make([]byte, payloadLen)
if payloadLen > 0 {
if _, err := io.ReadFull(r, payload); err != nil {
return nil, fmt.Errorf("read payload: %w", err)
}
}
return &Frame{OpCode: opCode, Payload: payload}, nil
}
func WriteFrame(w io.Writer, opCode byte, payload []byte) error {
data := EncodeFrame(opCode, payload)
_, err := w.Write(data)
return err
}
func encodeVarint(buf []byte, v uint64) int {
i := 0
for v >= 0x80 {
buf[i] = byte(v) | 0x80
v >>= 7
i++
}
buf[i] = byte(v)
return i + 1
}
func varintLen(v uint64) int {
l := 0
for {
l++
if v < 0x80 {
break
}
v >>= 7
}
return l
}
func readVarint(r io.Reader) (uint64, error) {
var v uint64
var shift uint
for {
b := make([]byte, 1)
if _, err := io.ReadFull(r, b); err != nil {
return 0, err
}
v |= uint64(b[0]&0x7F) << shift
if b[0]&0x80 == 0 {
break
}
shift += 7
if shift > 63 {
return 0, fmt.Errorf("varint too long")
}
}
return v, nil
}
func ReadUint64(buf []byte) uint64 {
return binary.BigEndian.Uint64(buf)
}
func PutUint64(buf []byte, v uint64) {
binary.BigEndian.PutUint64(buf, v)
}
func ReadUint32(buf []byte) uint32 {
return binary.BigEndian.Uint32(buf)
}
func PutUint32(buf []byte, v uint32) {
binary.BigEndian.PutUint32(buf, v)
}

82
internal/protocol/media.go Normal file
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package protocol
import (
"encoding/binary"
"io"
"github.com/niko/qcc/pkg/types"
)
const MediaHeaderSize = 8 + 4 + 1 + 1 + 4
type MediaPacket struct {
CallID uint64
SeqNum uint32
Codec types.CodecType
Flags types.MediaFlags
Timestamp uint32
Payload []byte
}
func MarshalMediaPacket(pkt *MediaPacket) []byte {
size := MediaHeaderSize + len(pkt.Payload)
buf := make([]byte, size)
off := 0
binary.BigEndian.PutUint64(buf[off:], pkt.CallID)
off += 8
binary.LittleEndian.PutUint32(buf[off:], pkt.SeqNum)
off += 4
buf[off] = byte(pkt.Codec)
off++
buf[off] = byte(pkt.Flags)
off++
binary.BigEndian.PutUint32(buf[off:], pkt.Timestamp)
off += 4
copy(buf[off:], pkt.Payload)
return buf
}
func UnmarshalMediaPacket(data []byte) (*MediaPacket, bool) {
if len(data) < MediaHeaderSize {
return nil, false
}
pkt := &MediaPacket{}
off := 0
pkt.CallID = binary.BigEndian.Uint64(data[off:])
off += 8
pkt.SeqNum = binary.LittleEndian.Uint32(data[off:])
off += 4
pkt.Codec = types.CodecType(data[off])
off++
pkt.Flags = types.MediaFlags(data[off])
off++
pkt.Timestamp = binary.BigEndian.Uint32(data[off:])
off += 4
pkt.Payload = make([]byte, len(data)-off)
copy(pkt.Payload, data[off:])
return pkt, true
}
func ReadMediaPacket(r io.Reader) (*MediaPacket, error) {
header := make([]byte, MediaHeaderSize)
if _, err := io.ReadFull(r, header); err != nil {
return nil, err
}
pkt := &MediaPacket{}
off := 0
pkt.CallID = binary.BigEndian.Uint64(header[off:])
off += 8
pkt.SeqNum = binary.LittleEndian.Uint32(header[off:])
off += 4
pkt.Codec = types.CodecType(header[off])
off++
pkt.Flags = types.MediaFlags(header[off])
off++
pkt.Timestamp = binary.BigEndian.Uint32(header[off:])
payload, err := io.ReadAll(r)
if err != nil {
return nil, err
}
pkt.Payload = payload
return pkt, nil
}

46
internal/server/bandwidth.go Normal file
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package server
import (
"errors"
"strconv"
"strings"
)
const (
_byte = 1
kilobyte = _byte * 1000
megabyte = kilobyte * 1000
gigabyte = megabyte * 1000
)
func parseBandwidth(s string) (uint64, error) {
s = strings.ToLower(strings.TrimSpace(s))
split := 0
for i, c := range s {
if c < '0' || c > '9' {
split = i
break
}
}
if split == 0 {
return 0, errors.New("invalid bandwidth format")
}
v, err := strconv.ParseUint(s[:split], 10, 64)
if err != nil {
return 0, err
}
unit := strings.TrimSpace(s[split:])
switch unit {
case "b", "bps":
return v / 8, nil
case "k", "kb", "kbps":
return v * kilobyte / 8, nil
case "m", "mb", "mbps":
return v * megabyte / 8, nil
case "g", "gb", "gbps":
return v * gigabyte / 8, nil
default:
return 0, errors.New("unsupported bandwidth unit")
}
}

374
internal/server/server.go Normal file
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package server
import (
"context"
"crypto/ed25519"
"crypto/rand"
"crypto/tls"
"encoding/binary"
"fmt"
"sync"
"github.com/apernet/quic-go"
"github.com/caddyserver/certmagic"
"github.com/libdns/cloudflare"
"go.uber.org/zap"
"github.com/niko/qcc/internal/auth"
"github.com/niko/qcc/internal/ca"
"github.com/niko/qcc/internal/call"
"github.com/niko/qcc/internal/congestion/brutal"
"github.com/niko/qcc/internal/config"
"github.com/niko/qcc/internal/identity"
"github.com/niko/qcc/internal/protocol"
"github.com/niko/qcc/internal/store"
"github.com/niko/qcc/internal/transport"
"github.com/niko/qcc/pkg/types"
)
type Server struct {
cfg *config.Config
logger *zap.Logger
st *store.Engine
ca *ca.CA
identMgr *identity.Manager
callMgr *call.Manager
trans *transport.Server
sessions map[string]*Session
sessionsMu sync.RWMutex
cancel context.CancelFunc
}
func New(cfg *config.Config, logger *zap.Logger) (*Server, error) {
st, err := store.NewEngine(cfg.DataDir)
if err != nil {
return nil, fmt.Errorf("init store: %w", err)
}
masterKey := make([]byte, 32)
if _, err := rand.Read(masterKey); err != nil {
return nil, fmt.Errorf("generate master key: %w", err)
}
var mk [32]byte
copy(mk[:], masterKey)
ca, err := ca.NewOrLoad(cfg.DataDir, cfg.CA.KeyType, cfg.CA.Validity)
if err != nil {
return nil, fmt.Errorf("init ca: %w", err)
}
identMgr, err := identity.NewManager(st, mk, cfg.Identity.Prefix, cfg.Identity.Cooldown, logger)
if err != nil {
return nil, fmt.Errorf("init identity manager: %w", err)
}
return &Server{
cfg: cfg,
logger: logger,
st: st,
ca: ca,
identMgr: identMgr,
sessions: make(map[string]*Session),
}, nil
}
func (s *Server) Start(ctx context.Context) error {
ctx, s.cancel = context.WithCancel(ctx)
tlsCfg, err := s.setupTLS()
if err != nil {
return fmt.Errorf("tls setup: %w", err)
}
brutalBPS, err := parseBandwidth(s.cfg.Relay.BandwidthUp)
if err != nil {
s.logger.Warn("Failed to parse relay bandwidth, using default", zap.Error(err))
brutalBPS = 10 * 1000 * 1000 / 8 // 10 mbps default
}
s.callMgr = call.NewManager(
s.logger,
s,
s.cfg.Relay.MediaTimeout,
brutalBPS,
func(conn *quic.Conn, bps uint64) {
conn.SetCongestionControl(brutal.NewBrutalSender(bps))
},
)
s.trans, err = transport.NewServer(s.cfg.Server.Listen, tlsCfg, s.logger, s)
if err != nil {
return fmt.Errorf("transport: %w", err)
}
err = s.trans.Start(ctx)
s.shutdown()
return err
}
func (s *Server) shutdown() {
s.logger.Info("Shutting down server...")
if s.callMgr != nil {
s.callMgr.Stop()
}
if s.trans != nil {
s.trans.Close()
}
s.sessionsMu.Lock()
for number, sess := range s.sessions {
if conn := sess.Conn(); conn != nil {
conn.CloseWithError(0, "server shutdown")
}
delete(s.sessions, number)
}
s.sessionsMu.Unlock()
if s.st != nil {
s.st.Close()
}
s.logger.Info("Server shutdown complete")
}
func (s *Server) setupTLS() (*tls.Config, error) {
if len(s.cfg.ACME.Domains) == 0 || s.cfg.ACME.Email == "" {
s.logger.Warn("ACME not configured, starting without TLS (insecure)")
return &tls.Config{
MinVersion: tls.VersionTLS13,
InsecureSkipVerify: true,
}, nil
}
dnsSolver := &certmagic.DNS01Solver{
DNSProvider: &cloudflare.Provider{
APIToken: s.cfg.ACME.DNS.Config["cloudflare_api_token"],
},
}
return transport.NewTLSConfig(
s.cfg.ACME.Domains,
s.cfg.ACME.Email,
s.cfg.ACME.CA,
dnsSolver,
s.logger,
)
}
func (s *Server) OnConnect(ctx context.Context, conn *quic.Conn) {
sess := NewSession(conn)
s.logger.Info("New connection",
zap.String("remote", conn.RemoteAddr().String()))
go s.handleStreams(ctx, conn, sess)
go s.handleDatagrams(ctx, conn, sess)
<-ctx.Done()
s.Unregister(sess.Number())
conn.CloseWithError(0, "shutdown")
}
func (s *Server) handleStreams(ctx context.Context, conn *quic.Conn, sess *Session) {
for {
str, err := conn.AcceptStream(ctx)
if err != nil {
return
}
go s.handleStream(ctx, str, sess)
}
}
func (s *Server) handleDatagrams(ctx context.Context, conn *quic.Conn, sess *Session) {
for {
data, err := conn.ReceiveDatagram(ctx)
if err != nil {
return
}
if len(data) == 0 {
continue
}
if s.callMgr != nil && sess.IsAuthenticated() && sess.CallID() != 0 {
s.callMgr.RelayMedia(conn, data)
}
}
}
func (s *Server) handleStream(ctx context.Context, stream *quic.Stream, sess *Session) {
st := transport.NewStream(stream)
sess.SetStream(st)
for {
frame, err := st.ReadFrame()
if err != nil {
return
}
switch types.OpCode(frame.OpCode) {
case types.OpGetChallenge:
s.handleGetChallenge(sess)
case types.OpSolve:
s.handleSolve(sess, frame.Payload)
case types.OpReroll:
s.handleReroll(sess)
case types.OpDial:
if !sess.IsAuthenticated() {
sendOpError(st, types.ErrInvalidRequest, "not authenticated")
continue
}
s.callMgr.HandleDial(sess, frame.Payload)
case types.OpAccept:
s.callMgr.HandleAccept(sess, frame.Payload)
case types.OpReject:
s.callMgr.HandleReject(sess, frame.Payload)
case types.OpEnd:
s.callMgr.HandleEnd(sess, frame.Payload)
default:
sendOpError(st, types.ErrInvalidRequest, "unknown opcode")
}
}
}
func (s *Server) handleGetChallenge(sess *Session) {
challenge := auth.NewChallenge(s.cfg.PoW.Difficulty)
if st := sess.Stream(); st != nil {
st.WriteFrame(byte(types.OpChallenge), challenge.Marshal())
}
}
func (s *Server) handleSolve(sess *Session, payload []byte) {
solution := auth.UnmarshalSolution(payload)
if solution == nil {
sendOpError(sess.Stream(), types.ErrPoWInvalid, "invalid solution format")
return
}
challenge := auth.NewChallenge(s.cfg.PoW.Difficulty)
if err := challenge.Verify(solution, s.cfg.PoW.ChallengeTTL); err != nil {
sendOpError(sess.Stream(), types.ErrPoWInvalid, err.Error())
return
}
var pubKey [32]byte
copy(pubKey[:], solution.ClientPubKey[:])
ident, err := s.identMgr.Allocate(pubKey)
if err != nil {
sendOpError(sess.Stream(), types.ErrInternal, err.Error())
return
}
certDER, err := s.ca.IssueCert(ident.Number, ed25519.PublicKey(pubKey[:]), s.cfg.CA.Validity)
if err != nil {
sendOpError(sess.Stream(), types.ErrInternal, "cert issuance failed")
return
}
ident.CertDER = certDER
sess.Authenticate(ident.Number, pubKey, certDER)
s.Register(sess, ident.Number)
payload = marshalIdentityResponse(ident.Number, certDER, s.ca.CACertPEM())
if st := sess.Stream(); st != nil {
st.WriteFrame(byte(types.OpIdentity), payload)
}
s.logger.Info("Client authenticated",
zap.String("number", ident.Number))
}
func (s *Server) handleReroll(sess *Session) {
if !sess.IsAuthenticated() {
sendOpError(sess.Stream(), types.ErrInvalidRequest, "not authenticated")
return
}
newIdent, err := s.identMgr.Reroll(sess.PubKey())
if err != nil {
if _, ok := err.(*identity.CooldownError); ok {
sendOpError(sess.Stream(), types.ErrCooldown, err.Error())
} else {
sendOpError(sess.Stream(), types.ErrInternal, err.Error())
}
return
}
certDER, err := s.ca.IssueCert(newIdent.Number, ed25519.PublicKey(newIdent.PubKey[:]), s.cfg.CA.Validity)
if err != nil {
sendOpError(sess.Stream(), types.ErrInternal, "cert issuance failed")
return
}
newIdent.CertDER = certDER
s.Unregister(sess.Number())
sess.Authenticate(newIdent.Number, newIdent.PubKey, certDER)
s.Register(sess, newIdent.Number)
payload := marshalIdentityResponse(newIdent.Number, certDER, s.ca.CACertPEM())
if st := sess.Stream(); st != nil {
st.WriteFrame(byte(types.OpIdentity), payload)
}
s.logger.Info("Number rerolled",
zap.String("old", sess.Number()),
zap.String("new", newIdent.Number))
}
func marshalIdentityResponse(number string, certDER, caCertPEM []byte) []byte {
payload := make([]byte, len(number)+1+2+len(certDER)+len(caCertPEM))
off := 0
copy(payload[off:], []byte(number))
off += len(number)
payload[off] = 0
off++
binary.BigEndian.PutUint16(payload[off:off+2], uint16(len(certDER)))
off += 2
copy(payload[off:], certDER)
off += len(certDER)
copy(payload[off:], caCertPEM)
return payload
}
func (s *Server) Register(sess call.CallSession, number string) {
s.sessionsMu.Lock()
defer s.sessionsMu.Unlock()
s.sessions[number] = sess.(*Session)
}
func (s *Server) Unregister(number string) {
if number == "" {
return
}
s.sessionsMu.Lock()
defer s.sessionsMu.Unlock()
delete(s.sessions, number)
}
func (s *Server) GetByNumber(number string) call.CallSession {
s.sessionsMu.RLock()
defer s.sessionsMu.RUnlock()
return s.sessions[number]
}
func (s *Server) GetAll() []call.CallSession {
s.sessionsMu.RLock()
defer s.sessionsMu.RUnlock()
result := make([]call.CallSession, 0, len(s.sessions))
for _, sess := range s.sessions {
result = append(result, sess)
}
return result
}
func sendOpError(st protocol.FrameReadWriter, code types.ErrorCode, msg string) {
if st == nil {
return
}
payload := make([]byte, 2+len(msg))
binary.BigEndian.PutUint16(payload[0:2], uint16(code))
copy(payload[2:], msg)
st.WriteFrame(byte(types.OpError), payload)
}

92
internal/server/session.go Normal file
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package server
import (
"sync"
"github.com/apernet/quic-go"
"github.com/niko/qcc/internal/protocol"
"github.com/niko/qcc/internal/transport"
)
type Session struct {
mu sync.Mutex
conn *quic.Conn
stream *transport.Stream
authenticated bool
number string
pubKey [32]byte
certDER []byte
activeCallID uint64
}
func NewSession(conn *quic.Conn) *Session {
return &Session{
conn: conn,
}
}
func (s *Session) SetStream(st *transport.Stream) {
s.mu.Lock()
defer s.mu.Unlock()
s.stream = st
}
func (s *Session) Stream() protocol.FrameReadWriter {
s.mu.Lock()
defer s.mu.Unlock()
if s.stream == nil {
return nil
}
return s.stream
}
func (s *Session) Conn() *quic.Conn {
return s.conn
}
func (s *Session) Authenticate(number string, pubKey [32]byte, certDER []byte) {
s.mu.Lock()
defer s.mu.Unlock()
s.authenticated = true
s.number = number
s.pubKey = pubKey
s.certDER = certDER
}
func (s *Session) IsAuthenticated() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.authenticated
}
func (s *Session) Number() string {
s.mu.Lock()
defer s.mu.Unlock()
return s.number
}
func (s *Session) PubKey() [32]byte {
s.mu.Lock()
defer s.mu.Unlock()
return s.pubKey
}
func (s *Session) SetCallID(id uint64) {
s.mu.Lock()
defer s.mu.Unlock()
s.activeCallID = id
}
func (s *Session) CallID() uint64 {
s.mu.Lock()
defer s.mu.Unlock()
return s.activeCallID
}
func (s *Session) ClearCall() {
s.mu.Lock()
defer s.mu.Unlock()
s.activeCallID = 0
}

59
internal/store/encrypt.go Normal file
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package store
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"io"
"github.com/niko/qcc/internal/crypto"
)
var MasterKey [32]byte
func SetMasterKey(key [32]byte) {
MasterKey = key
}
func EncryptRecordPayload(plaintext []byte, key [32]byte) (nonce [12]byte, ciphertext []byte, authTag []byte, err error) {
return crypto.EncryptRecord(plaintext, key)
}
func DecryptRecordPayload(ciphertext []byte, nonce [12]byte, authTag []byte, key [32]byte) ([]byte, error) {
return crypto.DecryptRecord(ciphertext, nonce, authTag, key)
}
func EncryptIndexData(data []byte) (nonce [12]byte, ciphertext []byte, authTag []byte, err error) {
block, err := aes.NewCipher(MasterKey[:])
if err != nil {
return nonce, nil, nil, err
}
aead, err := cipher.NewGCM(block)
if err != nil {
return nonce, nil, nil, err
}
_, err = io.ReadFull(rand.Reader, nonce[:])
if err != nil {
return nonce, nil, nil, err
}
sealed := aead.Seal(nil, nonce[:], data, nil)
tagStart := len(sealed) - aead.Overhead()
ciphertext = sealed[:tagStart]
authTag = sealed[tagStart:]
return nonce, ciphertext, authTag, nil
}
func DecryptIndexData(ciphertext []byte, nonce [12]byte, authTag []byte) ([]byte, error) {
block, err := aes.NewCipher(MasterKey[:])
if err != nil {
return nil, err
}
aead, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
sealed := make([]byte, len(ciphertext)+len(authTag))
copy(sealed, ciphertext)
copy(sealed[len(ciphertext):], authTag)
return aead.Open(nil, nonce[:], sealed, nil)
}

170
internal/store/engine.go Normal file
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package store
import (
"fmt"
"os"
"path/filepath"
"sync"
)
type Engine struct {
mu sync.RWMutex
DataDir string
Tables map[string]*Table
frames map[string]*frameState
}
type frameState struct {
lastFrameID uint64
lastHash [32]byte
frameCount int
}
func NewEngine(dataDir string) (*Engine, error) {
dirs := []string{
dataDir,
filepath.Join(dataDir, "identities"),
filepath.Join(dataDir, "calls"),
filepath.Join(dataDir, "indexes"),
filepath.Join(dataDir, "acme"),
}
for _, d := range dirs {
if err := os.MkdirAll(d, 0700); err != nil {
return nil, fmt.Errorf("mkdir %s: %w", d, err)
}
}
e := &Engine{
DataDir: dataDir,
Tables: make(map[string]*Table),
frames: make(map[string]*frameState),
}
if err := e.initDB(); err != nil {
return nil, err
}
return e, nil
}
func (e *Engine) initDB() error {
path := filepath.Join(e.DataDir, "qcc.db")
if _, err := os.Stat(path); os.IsNotExist(err) {
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
header := make([]byte, 14)
copy(header[0:4], []byte("QCC\x00"))
header[4] = 1
header[5] = 0
_, err = f.Write(header)
return err
}
return nil
}
func (e *Engine) GetTable(name string) (*Table, error) {
e.mu.Lock()
defer e.mu.Unlock()
if t, ok := e.Tables[name]; ok {
return t, nil
}
fs, ok := e.frames[name]
if !ok {
fs = &frameState{}
e.frames[name] = fs
lastFrame, lastHash, count := e.scanFrames(name)
fs.lastFrameID = lastFrame
fs.lastHash = lastHash
fs.frameCount = count
}
tablePath := filepath.Join(e.DataDir, name)
t := &Table{
engine: e,
name: name,
path: tablePath,
lastHash: fs.lastHash,
nextID: fs.lastFrameID + 1,
frameCount: fs.frameCount,
index: make(map[uint64]IndexEntry),
}
e.Tables[name] = t
if err := t.loadLastIndex(); err != nil {
return nil, err
}
return t, nil
}
func (e *Engine) scanFrames(name string) (uint64, [32]byte, int) {
dir := filepath.Join(e.DataDir, name)
entries, err := os.ReadDir(dir)
if err != nil {
return 0, [32]byte{}, 0
}
var lastID uint64
var lastHash [32]byte
count := 0
var prevFrameID uint64
var prevHash [32]byte
for _, entry := range entries {
if filepath.Ext(entry.Name()) != ".frm" {
continue
}
data, err := os.ReadFile(filepath.Join(dir, entry.Name()))
if err != nil {
continue
}
if len(data) < 66 {
continue
}
storedChecksum := data[len(data)-32:]
computedChecksum := ComputeFrameChecksum(data[:len(data)-32])
if string(storedChecksum) != string(computedChecksum[:]) {
continue
}
f, err := UnmarshalFrame(data)
if err != nil {
continue
}
if count > 0 {
if f.Header.PrevFrameID != prevFrameID ||
string(f.Header.PrevHash[:]) != string(prevHash[:]) {
continue
}
}
if f.Header.FrameID > lastID {
lastID = f.Header.FrameID
lastHash = computedChecksum
}
prevFrameID = f.Header.FrameID
prevHash = computedChecksum
count++
}
return lastID, lastHash, count
}
func (e *Engine) UpdateFrameState(name string, frameID uint64, hash [32]byte) {
e.mu.Lock()
defer e.mu.Unlock()
if fs, ok := e.frames[name]; ok {
if frameID > fs.lastFrameID {
fs.lastFrameID = frameID
fs.lastHash = hash
fs.frameCount++
}
}
}
func (e *Engine) Close() error {
e.mu.Lock()
defer e.mu.Unlock()
for _, t := range e.Tables {
if err := t.flushIndex(); err != nil {
return err
}
}
return nil
}

195
internal/store/frame.go Normal file
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package store
import (
"crypto/sha256"
"encoding/binary"
"encoding/hex"
"fmt"
"time"
"github.com/niko/qcc/pkg/types"
)
type FrameHeader struct {
Magic [4]byte
Version uint16
FrameID uint64
PrevFrameID uint64
PrevHash [32]byte
Timestamp int64
NumRecords uint32
}
const FrameHeaderSize = 4 + 2 + 8 + 8 + 32 + 8 + 4
const RecordHeaderSize = 1 + 1 + 2 + 8 + 4 + 12 + 16
type RecordHeader struct {
RecType types.RecType
Flags uint8
TableID uint16
KeyHash uint64
PayloadSize uint32
Nonce [12]byte
AuthTag [16]byte
}
type Frame struct {
Header FrameHeader
Records []Record
}
type Record struct {
Header RecordHeader
Payload []byte
}
func NewFrameHeader(prevFrameID uint64, prevHash [32]byte) FrameHeader {
var magic [4]byte
copy(magic[:], []byte("QCCF"))
return FrameHeader{
Magic: magic,
Version: 1,
FrameID: prevFrameID + 1,
PrevFrameID: prevFrameID,
PrevHash: prevHash,
Timestamp: time.Now().UnixNano(),
}
}
func MarshalFrame(f *Frame) ([]byte, error) {
size := FrameHeaderSize
for _, rec := range f.Records {
size += RecordHeaderSize + len(rec.Payload)
}
padding := (8 - (size % 8)) % 8
size += padding + 32
buf := make([]byte, size)
off := 0
copy(buf[off:], f.Header.Magic[:])
off += 4
binary.BigEndian.PutUint16(buf[off:], f.Header.Version)
off += 2
binary.BigEndian.PutUint64(buf[off:], f.Header.FrameID)
off += 8
binary.BigEndian.PutUint64(buf[off:], f.Header.PrevFrameID)
off += 8
copy(buf[off:], f.Header.PrevHash[:])
off += 32
binary.BigEndian.PutUint64(buf[off:], uint64(f.Header.Timestamp))
off += 8
binary.BigEndian.PutUint32(buf[off:], uint32(len(f.Records)))
off += 4
for _, rec := range f.Records {
buf[off] = byte(rec.Header.RecType)
off++
buf[off] = rec.Header.Flags
off++
binary.BigEndian.PutUint16(buf[off:], rec.Header.TableID)
off += 2
binary.BigEndian.PutUint64(buf[off:], rec.Header.KeyHash)
off += 8
binary.BigEndian.PutUint32(buf[off:], rec.Header.PayloadSize)
off += 4
copy(buf[off:], rec.Header.Nonce[:])
off += 12
copy(buf[off:], rec.Header.AuthTag[:])
off += 16
copy(buf[off:], rec.Payload)
off += len(rec.Payload)
}
for i := 0; i < padding; i++ {
buf[off] = 0
off++
}
hash := sha256.Sum256(buf[:off])
copy(buf[off:], hash[:])
off += 32
return buf[:off], nil
}
func UnmarshalFrame(data []byte) (*Frame, error) {
if len(data) < FrameHeaderSize+32 {
return nil, fmt.Errorf("frame too short: %d", len(data))
}
dataLen := len(data)
checksumStart := dataLen - 32
storedChecksum := data[checksumStart:]
computed := sha256.Sum256(data[:checksumStart])
if !constantTimeEqual(storedChecksum, computed[:]) {
return nil, fmt.Errorf("frame checksum mismatch")
}
f := &Frame{}
off := 0
copy(f.Header.Magic[:], data[off:off+4])
off += 4
if string(f.Header.Magic[:]) != "QCCF" {
return nil, fmt.Errorf("invalid frame magic: %s", hex.EncodeToString(f.Header.Magic[:]))
}
f.Header.Version = binary.BigEndian.Uint16(data[off:])
off += 2
f.Header.FrameID = binary.BigEndian.Uint64(data[off:])
off += 8
f.Header.PrevFrameID = binary.BigEndian.Uint64(data[off:])
off += 8
copy(f.Header.PrevHash[:], data[off:off+32])
off += 32
f.Header.Timestamp = int64(binary.BigEndian.Uint64(data[off:]))
off += 8
f.Header.NumRecords = binary.BigEndian.Uint32(data[off:])
off += 4
for i := uint32(0); i < f.Header.NumRecords; i++ {
if off+RecordHeaderSize > checksumStart {
return nil, fmt.Errorf("record header %d exceeds frame bounds", i)
}
var rec Record
rec.Header.RecType = types.RecType(data[off])
off++
rec.Header.Flags = data[off]
off++
rec.Header.TableID = binary.BigEndian.Uint16(data[off:])
off += 2
rec.Header.KeyHash = binary.BigEndian.Uint64(data[off:])
off += 8
rec.Header.PayloadSize = binary.BigEndian.Uint32(data[off:])
off += 4
copy(rec.Header.Nonce[:], data[off:off+12])
off += 12
copy(rec.Header.AuthTag[:], data[off:off+16])
off += 16
if off+int(rec.Header.PayloadSize) > checksumStart {
return nil, fmt.Errorf("record payload %d exceeds frame bounds", i)
}
rec.Payload = make([]byte, rec.Header.PayloadSize)
copy(rec.Payload, data[off:off+int(rec.Header.PayloadSize)])
off += int(rec.Header.PayloadSize)
f.Records = append(f.Records, rec)
}
return f, nil
}
func ComputeFrameChecksum(frameData []byte) [32]byte {
return sha256.Sum256(frameData)
}
func constantTimeEqual(a, b []byte) bool {
if len(a) != len(b) {
return false
}
var v byte
for i := 0; i < len(a); i++ {
v |= a[i] ^ b[i]
}
return v == 0
}

127
internal/store/index.go Normal file
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package store
import (
"encoding/binary"
"fmt"
"os"
"path/filepath"
"github.com/niko/qcc/pkg/types"
)
type IndexFrame struct {
Entries map[uint64]IndexEntry
FrameID uint64
}
func BuildIndex(table *Table) (*IndexFrame, error) {
table.mu.RLock()
defer table.mu.RUnlock()
idx := &IndexFrame{
Entries: make(map[uint64]IndexEntry),
FrameID: table.nextID - 1,
}
for keyHash, entry := range table.index {
idx.Entries[keyHash] = entry
}
return idx, nil
}
func (idx *IndexFrame) MarshalBinary() ([]byte, error) {
size := 8 + 8 + len(idx.Entries)*24
buf := make([]byte, size)
off := 0
binary.BigEndian.PutUint64(buf[off:], idx.FrameID)
off += 8
binary.BigEndian.PutUint64(buf[off:], uint64(len(idx.Entries)))
off += 8
for keyHash, entry := range idx.Entries {
binary.BigEndian.PutUint64(buf[off:], keyHash)
off += 8
binary.BigEndian.PutUint64(buf[off:], entry.FrameID)
off += 8
binary.BigEndian.PutUint64(buf[off:], uint64(entry.Offset))
off += 8
}
return buf, nil
}
func UnmarshalIndexFrame(data []byte) (*IndexFrame, error) {
if len(data) < 16 {
return nil, nil
}
idx := &IndexFrame{
Entries: make(map[uint64]IndexEntry),
}
off := 0
idx.FrameID = binary.BigEndian.Uint64(data[off:])
off += 8
count := binary.BigEndian.Uint64(data[off:])
off += 8
for i := uint64(0); i < count; i++ {
if off+24 > len(data) {
break
}
keyHash := binary.BigEndian.Uint64(data[off:])
off += 8
frameID := binary.BigEndian.Uint64(data[off:])
off += 8
offset := binary.BigEndian.Uint64(data[off:])
off += 8
idx.Entries[keyHash] = IndexEntry{FrameID: frameID, Offset: uint32(offset)}
}
return idx, nil
}
func AppendIndexToTable(table *Table, idx *IndexFrame) error {
idxData, err := idx.MarshalBinary()
if err != nil {
return err
}
keyHash := uint64(0xFFFFFFFFFFFFFFFF)
header := RecordHeader{
RecType: types.RecIndex,
Flags: 0,
TableID: 0,
KeyHash: keyHash,
PayloadSize: uint32(len(idxData)),
}
frame := &Frame{
Header: NewFrameHeader(table.nextID-1, table.lastHash),
Records: []Record{
{Header: header, Payload: idxData},
},
}
data, err := MarshalFrame(frame)
if err != nil {
return err
}
frameName := pathForIndexFrame(table.name, table.nextID)
framePath := filepath.Join(table.path, frameName)
if err := os.WriteFile(framePath, data, 0600); err != nil {
return err
}
checksum := ComputeFrameChecksum(data[:len(data)-32])
table.engine.UpdateFrameState(table.name, table.nextID, checksum)
table.lastHash = checksum
table.nextID++
table.frameCount++
return nil
}
func pathForIndexFrame(tableName string, frameID uint64) string {
return filepath.Join(tableName, "indexes", fmt.Sprintf("%016x.idx", frameID))
}

176
internal/store/table.go Normal file
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package store
import (
"encoding/binary"
"fmt"
"os"
"path/filepath"
"sync"
"github.com/niko/qcc/internal/crypto"
"github.com/niko/qcc/pkg/types"
)
type IndexEntry struct {
FrameID uint64
Offset uint32
}
type Table struct {
mu sync.RWMutex
engine *Engine
name string
path string
lastHash [32]byte
nextID uint64
frameCount int
index map[uint64]IndexEntry
}
func (t *Table) Insert(keyHash uint64, recType types.RecType, tableID uint16, payload []byte, key [32]byte) error {
t.mu.Lock()
defer t.mu.Unlock()
nonce, ciphertext, authTag, err := crypto.EncryptRecord(payload, key)
if err != nil {
return err
}
var authTagArr [16]byte
copy(authTagArr[:], authTag)
header := RecordHeader{
RecType: recType,
Flags: 0x01,
TableID: tableID,
KeyHash: keyHash,
PayloadSize: uint32(len(ciphertext)),
Nonce: nonce,
AuthTag: authTagArr,
}
frame := &Frame{
Header: NewFrameHeader(t.nextID-1, t.lastHash),
Records: []Record{
{Header: header, Payload: ciphertext},
},
}
data, err := MarshalFrame(frame)
if err != nil {
return err
}
frameName := fmt.Sprintf("%016x.frm", t.nextID)
framePath := filepath.Join(t.path, frameName)
if err := os.WriteFile(framePath, data, 0600); err != nil {
return err
}
checksum := ComputeFrameChecksum(data[:len(data)-32])
t.engine.UpdateFrameState(t.name, t.nextID, checksum)
t.lastHash = checksum
t.index[keyHash] = IndexEntry{FrameID: t.nextID, Offset: 0}
t.nextID++
t.frameCount++
if t.frameCount%10 == 0 {
return t.saveIndex()
}
return nil
}
func (t *Table) Get(keyHash uint64, key [32]byte) ([]byte, error) {
t.mu.RLock()
entry, ok := t.index[keyHash]
t.mu.RUnlock()
if !ok {
return nil, fmt.Errorf("key not found: %x", keyHash)
}
return t.readRecord(entry, key)
}
func (t *Table) readRecord(entry IndexEntry, key [32]byte) ([]byte, error) {
frameName := fmt.Sprintf("%016x.frm", entry.FrameID)
framePath := filepath.Join(t.path, frameName)
data, err := os.ReadFile(framePath)
if err != nil {
return nil, err
}
f, err := UnmarshalFrame(data)
if err != nil {
return nil, err
}
if len(f.Records) == 0 {
return nil, fmt.Errorf("empty frame")
}
rec := f.Records[0]
return crypto.DecryptRecord(rec.Payload, rec.Header.Nonce, rec.Header.AuthTag[:], key)
}
func (t *Table) Has(keyHash uint64) bool {
t.mu.RLock()
defer t.mu.RUnlock()
_, ok := t.index[keyHash]
return ok
}
func (t *Table) Delete(keyHash uint64) {
t.mu.Lock()
defer t.mu.Unlock()
delete(t.index, keyHash)
}
func (t *Table) loadLastIndex() error {
indexPath := filepath.Join(t.engine.DataDir, "indexes", t.name+".idx")
data, err := os.ReadFile(indexPath)
if err != nil {
return nil
}
t.index = make(map[uint64]IndexEntry)
off := 0
for off+16 <= len(data) {
keyHash := binary.BigEndian.Uint64(data[off:])
frameID := binary.BigEndian.Uint64(data[off+8:])
t.index[keyHash] = IndexEntry{FrameID: frameID, Offset: 0}
off += 16
}
return nil
}
func (t *Table) saveIndex() error {
indexPath := filepath.Join(t.engine.DataDir, "indexes", t.name+".idx")
data := make([]byte, 0, len(t.index)*16)
for keyHash, entry := range t.index {
var buf [16]byte
binary.BigEndian.PutUint64(buf[0:8], keyHash)
binary.BigEndian.PutUint64(buf[8:16], entry.FrameID)
data = append(data, buf[:]...)
}
return os.WriteFile(indexPath, data, 0600)
}
func (t *Table) flushIndex() error {
t.mu.Lock()
defer t.mu.Unlock()
return t.saveIndex()
}
func (t *Table) Iterate(fn func(keyHash uint64, payload []byte) bool, key [32]byte) error {
t.mu.RLock()
defer t.mu.RUnlock()
for keyHash, entry := range t.index {
payload, err := t.readRecord(entry, key)
if err != nil {
continue
}
if !fn(keyHash, payload) {
break
}
}
return nil
}

141
internal/transport/server.go Normal file
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package transport
import (
"context"
"crypto/tls"
"fmt"
"net"
"github.com/apernet/quic-go"
"github.com/caddyserver/certmagic"
"go.uber.org/zap"
)
type Server struct {
listener *quic.Listener
tr *quic.Transport
logger *zap.Logger
handler ServerHandler
}
type ServerHandler interface {
OnConnect(ctx context.Context, conn *quic.Conn)
}
func NewServer(listenAddr string, tlsConfig *tls.Config, logger *zap.Logger, handler ServerHandler) (*Server, error) {
addr, err := net.ResolveUDPAddr("udp", listenAddr)
if err != nil {
return nil, fmt.Errorf("resolve addr: %w", err)
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
return nil, fmt.Errorf("listen udp: %w", err)
}
tr := &quic.Transport{Conn: conn}
listener, err := tr.Listen(tlsConfig, &quic.Config{
Allow0RTT: true,
KeepAlivePeriod: 15,
EnableDatagrams: true,
MaxIncomingStreams: 1000,
MaxIncomingUniStreams: -1,
})
if err != nil {
conn.Close()
return nil, fmt.Errorf("quic listen: %w", err)
}
return &Server{
listener: listener,
tr: tr,
logger: logger,
handler: handler,
}, nil
}
func NewTLSConfig(domains []string, email, caType string, dnsSolver *certmagic.DNS01Solver, logger *zap.Logger) (*tls.Config, error) {
dataDir := "data/acme"
cmCfg := &certmagic.Config{
RenewalWindowRatio: certmagic.DefaultRenewalWindowRatio,
KeySource: certmagic.DefaultKeyGenerator,
Storage: &certmagic.FileStorage{Path: dataDir},
Logger: logger,
}
cmIssuer := certmagic.NewACMEIssuer(cmCfg, certmagic.ACMEIssuer{
Email: email,
Agreed: true,
Logger: logger,
})
switch caType {
case "letsencrypt", "le", "":
cmIssuer.CA = certmagic.LetsEncryptProductionCA
case "zerossl", "zero":
cmIssuer.CA = certmagic.ZeroSSLProductionCA
default:
return nil, fmt.Errorf("unsupported CA: %s", caType)
}
if dnsSolver != nil {
cmIssuer.DisableHTTPChallenge = true
cmIssuer.DisableTLSALPNChallenge = true
cmIssuer.DNS01Solver = dnsSolver
} else {
cmIssuer.DisableHTTPChallenge = false
cmIssuer.DisableTLSALPNChallenge = true
}
cmCfg.Issuers = []certmagic.Issuer{cmIssuer}
cmCache := certmagic.NewCache(certmagic.CacheOptions{
GetConfigForCert: func(cert certmagic.Certificate) (*certmagic.Config, error) {
return cmCfg, nil
},
Logger: logger,
})
cmCfg = certmagic.New(cmCache, *cmCfg)
if len(domains) == 0 {
return nil, fmt.Errorf("no domains configured for ACME")
}
if err := cmCfg.ManageSync(context.Background(), domains); err != nil {
return nil, fmt.Errorf("acme manage sync: %w", err)
}
return &tls.Config{
MinVersion: tls.VersionTLS13,
GetCertificate: cmCfg.GetCertificate,
}, nil
}
func (s *Server) Start(ctx context.Context) error {
s.logger.Info("QUIC server listening",
zap.String("addr", s.listener.Addr().String()))
for {
conn, err := s.listener.Accept(ctx)
if err != nil {
select {
case <-ctx.Done():
return nil
default:
s.logger.Error("Accept error", zap.Error(err))
continue
}
}
go s.handler.OnConnect(ctx, conn)
}
}
func (s *Server) Close() error {
err1 := s.listener.Close()
err2 := s.tr.Close()
if err1 != nil {
return err1
}
return err2
}

27
internal/transport/stream.go Normal file
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package transport
import (
"sync"
"github.com/apernet/quic-go"
"github.com/niko/qcc/internal/protocol"
)
type Stream struct {
q *quic.Stream
mu sync.Mutex
}
func NewStream(s *quic.Stream) *Stream {
return &Stream{q: s}
}
func (s *Stream) ReadFrame() (*protocol.Frame, error) {
return protocol.ReadFrame(s.q)
}
func (s *Stream) WriteFrame(opCode byte, payload []byte) error {
s.mu.Lock()
defer s.mu.Unlock()
return protocol.WriteFrame(s.q, opCode, payload)
}

7
main.go Normal file
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package main
import "github.com/niko/qcc/cmd/qccd"
func main() {
qccd.Execute()
}

21
pkg/types/opcode.go Normal file
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package types
type OpCode byte
const (
OpGetChallenge OpCode = 0x01
OpChallenge OpCode = 0x02
OpSolve OpCode = 0x03
OpIdentity OpCode = 0x04
OpReroll OpCode = 0x05
OpDial OpCode = 0x10
OpRing OpCode = 0x11
OpAccept OpCode = 0x12
OpPeerAccept OpCode = 0x13
OpReject OpCode = 0x14
OpEnd OpCode = 0x15
OpPeerEnd OpCode = 0x16
OpError OpCode = 0xFF
)

54
pkg/types/types.go Normal file
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package types
type RecType uint8
const (
RecIdentity RecType = 1
RecCallLog RecType = 2
RecIndex RecType = 6
)
type ErrorCode uint16
const (
ErrNone ErrorCode = 0x00
ErrInternal ErrorCode = 0x01
ErrInvalidRequest ErrorCode = 0x02
ErrPoWInvalid ErrorCode = 0x03
ErrPoWExpired ErrorCode = 0x04
ErrPoWDifficulty ErrorCode = 0x05
ErrNumberTaken ErrorCode = 0x06
ErrCooldown ErrorCode = 0x07
ErrNumberNotFound ErrorCode = 0x08
ErrCallNotFound ErrorCode = 0x09
ErrBusy ErrorCode = 0x0A
ErrSelfCall ErrorCode = 0x0B
ErrRateLimited ErrorCode = 0x0C
)
type CodecType uint8
const (
CodecOpus CodecType = 1
CodecVP9 CodecType = 2
CodecH264 CodecType = 3
CodecH265 CodecType = 4
)
type MediaFlags uint8
const (
MediaKeyframe MediaFlags = 1 << 0
MediaSilence MediaFlags = 1 << 1
)
const (
MaxFrameSize = 67_108_864
MaxRecordsPerFrame = 1_000_000
)
const (
StreamAuth byte = 0x01
StreamCall byte = 0x02
DgramMedia byte = 0x10
)