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package syscon
import (
"bufio"
"bytes"
"config"
"datax"
"errors"
"fmt"
"net"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"syslog"
"time"
)
func StartNewService(conf *config.Config) {
if err := datax.SQLInit(conf); err != nil {
panic(syslog.BigError{Why: err, Cod: 1})
}
defer datax.DBClose()
lisfunc, isthere := networkListenType[conf.GetConf("listener_type", 0)]
if !isthere {
panic(syslog.BigError{Why: errors.New("invalid listener_type in config file, should be either inet or unix"), Cod: 1})
}
l := lisfunc(conf)
defer l.Close()
syslog.InformGreen("connection to sql server established")
syn := regexp.MustCompile(`(^sasl_username=.*[^\s].*)$`)
for {
conn, err := l.Accept()
if err != nil {
syslog.InformError(err)
continue
}
go handlePostfixConn(conn, syn)
}
}
func handlePostfixConn(conn net.Conn, syn *regexp.Regexp) {
defer conn.Close()
scanner := bufio.NewScanner(conn)
for scanner.Scan() {
if find := syn.MatchString(scanner.Text()); find {
pureName := strings.ReplaceAll(scanner.Text(), "sasl_username=", "")
userAcc, err := datax.GetUserFromDatabase(&pureName)
if err != nil {
syslog.InformError(err)
_, err := conn.Write([]byte("action=REJECT fixrate error: internal server error <1>, contact administrator\n\n"))
if err != nil {
syslog.InformError(err)
return
}
continue
}
if userAcc.LastReset.Add(time.Duration(userAcc.Reset) * time.Second).Before(time.Now()) {
if err := userAcc.UpdateUserLastReset(time.Now()); err != nil {
syslog.InformError(err)
_, err := conn.Write([]byte("action=REJECT fixrate error: internal server error <2>, contact administrator\n\n"))
if err != nil {
syslog.InformError(err)
return
}
continue
}
if err := userAcc.UpdateUserCounter(0); err != nil {
syslog.InformError(err)
_, err := conn.Write([]byte("action=REJECT fixrate error: internal server error <3>, contact administrator\n\n"))
if err != nil {
syslog.InformError(err)
return
}
continue
}
userAcc.Counter = 0
}
if userAcc.Limit <= userAcc.Counter {
diff := userAcc.LastReset.Add(time.Duration(userAcc.Reset) * time.Second).Sub(time.Now())
_, err := conn.Write([]byte(fmt.Sprintf("action=REJECT fixrate: sending limit exceeded, you can't send anything until next %v\n\n", diff.Round(time.Second))))
if err != nil {
syslog.InformError(err)
return
}
continue
}
if err := userAcc.UpdateUserCounter(userAcc.Counter + 1); err != nil {
syslog.InformError(err)
_, err := conn.Write([]byte("action=REJECT fixrate error: internal server error <4>, contact administrator\n\n"))
if err != nil {
syslog.InformError(err)
return
}
continue
}
if _, err := conn.Write([]byte("action=OK\n\n")); err != nil {
syslog.InformError(err)
return
}
}
}
if err := scanner.Err(); err != nil {
panic(syslog.BigError{Why: err, Cod: 1})
}
}
func checkUinixSocket(socketAddr string) (string, bool) {
unix, err := os.Open("/proc/net/unix")
if err != nil {
panic(syslog.BigError{Why: err, Cod: 1})
}
defer unix.Close()
u := bufio.NewScanner(unix)
for u.Scan() {
if bytes.Contains(u.Bytes(), []byte(socketAddr)) {
pid := findPid(strings.Fields(u.Text())[6])
return pid, true
}
}
if err := u.Err(); err != nil {
panic(syslog.BigError{Why: err, Cod: 1})
}
return "", false
}
var networkListenType = map[string]func(conf *config.Config) net.Listener{
"unix": func(conf *config.Config) net.Listener {
socketAddr := conf.GetConf("socket_path", 0)
if pid, exists := checkUinixSocket(socketAddr); exists {
panic(syslog.BigError{Why: fmt.Errorf("unix socket %v is held by another process (pid: %v), is another fixrate daemon runing?", socketAddr, pid), Cod: 1})
}
if err := os.RemoveAll(socketAddr); err != nil {
panic(syslog.BigError{Why: err, Cod: 1})
}
SockPerm, err := strconv.Atoi(conf.GetConf("socket_perm", 0))
if err != nil {
panic(syslog.BigError{Why: errors.New("socket_path should hold an integer"), Cod: 1})
}
l, err := net.Listen("unix", socketAddr)
if err != nil {
panic(syslog.BigError{Why: err, Cod: 1})
}
mod := os.FileMode(SockPerm)
if err = os.Chmod(socketAddr, mod); err != nil {
l.Close()
panic(syslog.BigError{Why: err, Cod: 1})
}
syslog.InformGreen("start listening on unix socket", socketAddr)
return l
},
"inet": func(conf *config.Config) net.Listener {
listenAddr := conf.GetConf("listen_addr", 0)
l, err := net.Listen("tcp", listenAddr)
if err != nil {
panic(syslog.BigError{Why: err, Cod: 1})
}
syslog.InformGreen("start listening on tcp address", listenAddr)
return l
},
}
func findPid(inode string) string {
type sysInodes struct {
path string
link string
}
var pid string
fd, err := filepath.Glob("/proc/[0-9]*/fd/[0-9]*")
if err != nil {
return pid
}
inodes := make([]sysInodes, len(fd))
mx := make(chan sysInodes, len(fd))
go func(fd *[]string, outchan chan<- sysInodes) {
for _, item := range *fd {
link, _ := os.Readlink(item)
outchan <- sysInodes{item, link}
}
}(&fd, mx)
for range fd {
inodes = append(inodes, <-mx)
}
re := regexp.MustCompile(inode)
for _, item := range inodes {
out := re.FindString(item.link)
if len(out) != 0 {
pid = strings.Split(item.path, "/")[2]
}
}
return pid
}
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