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package main
import (
"encoding/json"
"fmt"
"net/http"
"unit.nginx.org/go"
"os"
"strconv"
"io/ioutil"
)
type (
NS struct {
USER uint64
PID uint64
IPC uint64
CGROUP uint64
UTS uint64
MNT uint64
NET uint64
}
Output struct {
PID int
UID int
GID int
NS NS
FileExists bool
Mounts string
}
)
func abortonerr(err error) {
if err != nil {
panic(err)
}
}
// returns: [nstype]:[4026531835]
func getns(nstype string) uint64 {
str, err := os.Readlink(fmt.Sprintf("/proc/self/ns/%s", nstype))
if err != nil {
return 0
}
str = str[len(nstype)+2:]
str = str[:len(str)-1]
val, err := strconv.ParseUint(str, 10, 64)
abortonerr(err)
return val
}
func handler(w http.ResponseWriter, r *http.Request) {
pid := os.Getpid()
out := &Output{
PID: pid,
UID: os.Getuid(),
GID: os.Getgid(),
NS: NS{
PID: getns("pid"),
USER: getns("user"),
MNT: getns("mnt"),
IPC: getns("ipc"),
UTS: getns("uts"),
NET: getns("net"),
CGROUP: getns("cgroup"),
},
}
err := r.ParseForm()
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
if fname := r.Form.Get("file"); fname != "" {
_, err = os.Stat(fname);
out.FileExists = err == nil
}
if mounts := r.Form.Get("mounts"); mounts != "" {
data, _ := ioutil.ReadFile("/proc/self/mountinfo")
out.Mounts = string(data)
}
data, err := json.Marshal(out)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Header().Add("Content-Type", "application/json")
w.Write(data)
}
func main() {
http.HandleFunc("/", handler)
unit.ListenAndServe(":8080", nil)
}
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