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package sysctl
import (
"fmt"
"strings"
)
// Validate validates a list of sysctl and returns it.
func Validate(strSlice []string) (map[string]string, error) {
sysctl := make(map[string]string)
validSysctlMap := map[string]bool{
"kernel.msgmax": true,
"kernel.msgmnb": true,
"kernel.msgmni": true,
"kernel.sem": true,
"kernel.shmall": true,
"kernel.shmmax": true,
"kernel.shmmni": true,
"kernel.shm_rmid_forced": true,
}
validSysctlPrefixes := []string{
"net.",
"fs.mqueue.",
}
for _, val := range strSlice {
foundMatch := false
arr := strings.Split(val, "=")
if len(arr) < 2 {
return nil, fmt.Errorf("%s is invalid, sysctl values must be in the form of KEY=VALUE", val)
}
trimmed := fmt.Sprintf("%s=%s", strings.TrimSpace(arr[0]), strings.TrimSpace(arr[1]))
if trimmed != val {
return nil, fmt.Errorf("%q is invalid, extra spaces found", val)
}
if validSysctlMap[arr[0]] {
sysctl[arr[0]] = arr[1]
continue
}
for _, prefix := range validSysctlPrefixes {
if strings.HasPrefix(arr[0], prefix) {
sysctl[arr[0]] = arr[1]
foundMatch = true
break
}
}
if !foundMatch {
return nil, fmt.Errorf("sysctl %q is not allowed", arr[0])
}
}
return sysctl, nil
}
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