pkg/host: move machine info functionality from syz-fuzzer

It's better to keep functionality in packages rather than in main.
It makes it reusable and better organized.
Move machine info functionality to pkg/host and do some cosmetic refactoring.

1 files changed, 122 insertions, 0 deletions

diff --git a/pkg/host/machine_info_linux.go b/pkg/host/machine_info_linux.go
new file mode 100644
index 000000000..da1ee481a
--- /dev/null
+++ b/pkg/host/machine_info_linux.go
@@ -0,0 +1,122 @@
+// Copyright 2020 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package host
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func init() {
+	machineInfoFuncs = []machineInfoFunc{
+		{"CPU Info", readCPUInfo},
+		{"KVM", readKVMInfo},
+	}
+}
+
+func readCPUInfo(buffer *bytes.Buffer) error {
+	file, err := os.Open("/proc/cpuinfo")
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	scanCPUInfo(buffer, scanner)
+	return nil
+}
+
+func scanCPUInfo(buffer *bytes.Buffer, scanner *bufio.Scanner) {
+	keyIndices := make(map[string]int)
+	type keyValues struct {
+		key    string
+		values []string
+	}
+	var info []keyValues
+
+	for scanner.Scan() {
+		splitted := strings.Split(scanner.Text(), ":")
+		if len(splitted) != 2 {
+			continue
+		}
+		key := strings.TrimSpace(splitted[0])
+		val := strings.TrimSpace(splitted[1])
+
+		if idx, ok := keyIndices[key]; !ok {
+			idx = len(keyIndices)
+			keyIndices[key] = idx
+			info = append(info, keyValues{key, []string{val}})
+		} else {
+			info[idx].values = append(info[idx].values, val)
+		}
+	}
+
+	for _, kv := range info {
+		// It is guaranteed that len(vals) >= 1
+		key := kv.key
+		vals := kv.values
+		if allEqual(vals) {
+			fmt.Fprintf(buffer, "%-20s: %s\n", key, vals[0])
+		} else {
+			fmt.Fprintf(buffer, "%-20s: %s\n", key, strings.Join(vals, ", "))
+		}
+	}
+}
+
+func allEqual(slice []string) bool {
+	if len(slice) == 0 {
+		return true
+	}
+	for i := 1; i < len(slice); i++ {
+		if slice[i] != slice[0] {
+			return false
+		}
+	}
+	return true
+}
+
+func readKVMInfo(buffer *bytes.Buffer) error {
+	files, err := ioutil.ReadDir("/sys/module/")
+	if err != nil {
+		return err
+	}
+
+	for _, file := range files {
+		name := file.Name()
+		if !strings.HasPrefix(name, "kvm") {
+			continue
+		}
+
+		paramPath := filepath.Join("/sys", "module", name, "parameters")
+		params, err := ioutil.ReadDir(paramPath)
+		if err != nil {
+			if os.IsNotExist(err) {
+				continue
+			}
+			return err
+		}
+
+		if len(params) == 0 {
+			continue
+		}
+
+		fmt.Fprintf(buffer, "/sys/module/%s:\n", name)
+		for _, key := range params {
+			keyName := key.Name()
+			data, err := ioutil.ReadFile(filepath.Join(paramPath, keyName))
+			if err != nil {
+				return err
+			}
+			fmt.Fprintf(buffer, "\t%s: ", keyName)
+			buffer.Write(data)
+		}
+		buffer.WriteByte('\n')
+	}
+	return nil
+}