The Unsinkable Molly Brown: a full-featured Gemini server implemented in Go
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package main
import (
"crypto/tls"
"flag"
"log"
"os"
"strconv"
)
func main() {
var conf_file string
// Parse args and read config
flag.StringVar(&conf_file, "c", "", "Path to config file")
flag.Parse()
if conf_file == "" {
_, err := os.Stat("/etc/molly.conf")
if err == nil {
conf_file = "/etc/molly.conf"
}
}
config, err := getConfig(conf_file)
if err != nil {
log.Fatal(err)
}
// Open log files
var errorLogFile *os.File
if config.ErrorLog == "-" {
errorLogFile = os.Stdout
} else {
errorLogFile, err = os.OpenFile(config.ErrorLog, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
log.Fatal(err)
}
defer errorLogFile.Close()
}
errorLog := log.New(errorLogFile, "", log.Ldate | log.Ltime)
var accessLogFile *os.File
if config.AccessLog == "-" {
accessLogFile = os.Stdout
} else {
accessLogFile, err = os.OpenFile(config.AccessLog, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
errorLog.Println("Error opening access log file: " + err.Error())
log.Fatal(err)
}
defer accessLogFile.Close()
}
// Read TLS files, create TLS config
cert, err := tls.LoadX509KeyPair(config.CertPath, config.KeyPath)
if err != nil {
errorLog.Println("Error loading TLS keypair: " + err.Error())
log.Fatal(err)
}
tlscfg := &tls.Config{
Certificates: []tls.Certificate{cert},
MinVersion: tls.VersionTLS12,
ClientAuth: tls.RequestClientCert,
}
// Create TLS listener
listener, err := tls.Listen("tcp", ":"+strconv.Itoa(config.Port), tlscfg)
if err != nil {
errorLog.Println("Error creating TLS listener: " + err.Error())
log.Fatal(err)
}
defer listener.Close()
// Start log handling routines
accessLogEntries := make(chan LogEntry, 10)
go func() {
for {
entry := <-accessLogEntries
writeLogEntry(accessLogFile, entry)
}
}()
// Infinite serve loop
for {
conn, err := listener.Accept()
if err != nil {
errorLog.Println("Error accepting connection: " + err.Error())
log.Fatal(err)
}
go handleGeminiRequest(conn, config, accessLogEntries, errorLog)
}
}