The anonymous goroutine introduced in 4ca7e7b will never exit unless the command is aborted. This leaks a goroutine per successful invocation of ScanStream.

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x11268aa]

goroutine 1 [running]:
github.com/dutchcoders/go-clamd.(*Clamd).Ping(0x0?)
/root/GOPATH/pkg/mod/github.com/dutchcoders/[email protected]/clamd.go:118 +0x4a
github.com/chaitin/veinmind-tools/plugins/go/veinmind-malicious/sdk/av/clamav.Active(...)
/root/GOPATH/pkg/mod/github.com/chaitin/veinmind-tools/plugins/go/[email protected]/sdk/av/clamav/client.go:22

I have encountered an issue in this otherwise excellent package, It appears that the connection to clamd is not being closed. I am running this on a Debian jessie system, with go v1.4.2. It's pretty easy to reproduce, just run the example from the README in a loop a thousand times, pause, and check the open files (e.g. using lsof).

package main

import (
    "bufio"
    "bytes"
    "fmt"
    clamd "github.com/dutchcoders/go-clamd"
    "os"
)

func main() {
    for i := 0; i < 1000; i++ {
        sendRequest("/var/run/clamav/clamd.ctl", clamd.EICAR)
    }
    fmt.Println("Hit <enter>")
    bufio.NewReader(os.Stdin).ReadString('\n')
}

func sendRequest(clamav string, content []byte) {
    c := clamd.NewClamd(clamav)

    reader := bytes.NewReader(content)
    response, err := c.ScanStream(reader)

    for s := range response {
        fmt.Printf("%v %v\n", s, err)
    }
}

Looking at the code, it appears that line clamd.go:282 is not firing:

wg.Wait()

On a whim, I changed the return value of conn.go:76 to return a pointer to the WaitGroup, on the hunch that the return value is being copied and so will never fire. This works.

func (c *CLAMDConn) readResponse() (chan string, *sync.WaitGroup, error) {
...
    return ch, &wg, nil

Do you agree with my diagnosis?

Hi.

Please consider tagging a release to make this package compatible with package managers like dep or glide.

As easy as git tag v1.0.0 -m "first release" && git push --tags.

Thanks.