| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package openvpn_status_log |
| 4 | |
| 5 | import ( |
| 6 | "bufio" |
| 7 | "fmt" |
| 8 | "os" |
| 9 | "strconv" |
| 10 | "strings" |
| 11 | "time" |
| 12 | ) |
| 13 | |
| 14 | type clientInfo struct { |
| 15 | commonName string |
| 16 | bytesReceived int64 |
| 17 | bytesSent int64 |
| 18 | connectedSince int64 |
| 19 | } |
| 20 | |
| 21 | func parse(path string) ([]clientInfo, error) { |
| 22 | f, err := os.Open(path) |
| 23 | if err != nil { |
| 24 | return nil, err |
| 25 | } |
| 26 | defer func() { _ = f.Close() }() |
| 27 | |
| 28 | sc := bufio.NewScanner(f) |
| 29 | _ = sc.Scan() |
| 30 | line := sc.Text() |
| 31 | |
| 32 | if line == "OpenVPN CLIENT LIST" { |
| 33 | return parseV1(sc), nil |
| 34 | } |
| 35 | if strings.HasPrefix(line, "TITLE,OpenVPN") || strings.HasPrefix(line, "TITLE\tOpenVPN") { |
| 36 | return parseV2V3(sc), nil |
| 37 | } |
| 38 | if line == "OpenVPN STATISTICS" { |
| 39 | return parseStaticKey(sc), nil |
| 40 | } |
| 41 | return nil, fmt.Errorf("the status log file is invalid (%s)", path) |
| 42 | } |
| 43 | |
| 44 | func parseV1(sc *bufio.Scanner) []clientInfo { |
| 45 | // https://github.com/OpenVPN/openvpn/blob/d5315a5d7400a26f1113bbc44766d49dd0c3688f/src/openvpn/multi.c#L836 |
| 46 | var clients []clientInfo |
| 47 | |
| 48 | for sc.Scan() { |
| 49 | if !strings.HasPrefix(sc.Text(), "Common Name") { |
| 50 | continue |
| 51 | } |
| 52 | for sc.Scan() && !strings.HasPrefix(sc.Text(), "ROUTING TABLE") { |
| 53 | parts := strings.Split(sc.Text(), ",") |
| 54 | if len(parts) != 5 { |
| 55 | continue |
| 56 | } |
| 57 | |
| 58 | name := parts[0] |
| 59 | bytesRx, _ := strconv.ParseInt(parts[2], 10, 64) |
| 60 | bytesTx, _ := strconv.ParseInt(parts[3], 10, 64) |
| 61 | connSince, _ := time.Parse("Mon Jan 2 15:04:05 2006", parts[4]) |
| 62 | |
| 63 | clients = append(clients, clientInfo{ |
| 64 | commonName: name, |
| 65 | bytesReceived: bytesRx, |
| 66 | bytesSent: bytesTx, |
| 67 | connectedSince: connSince.Unix(), |
| 68 | }) |
| 69 | } |
| 70 | break |
| 71 | } |
| 72 | return clients |
| 73 | } |
| 74 | |
| 75 | func parseV2V3(sc *bufio.Scanner) []clientInfo { |
| 76 | // https://github.com/OpenVPN/openvpn/blob/d5315a5d7400a26f1113bbc44766d49dd0c3688f/src/openvpn/multi.c#L901 |
| 77 | var clients []clientInfo |
| 78 | var sep string |
| 79 | if strings.IndexByte(sc.Text(), '\t') != -1 { |
| 80 | sep = "\t" |
| 81 | } else { |
| 82 | sep = "," |
| 83 | } |
| 84 | |
| 85 | for sc.Scan() { |
| 86 | line := sc.Text() |
| 87 | if !strings.HasPrefix(line, "CLIENT_LIST") { |
| 88 | continue |
| 89 | } |
| 90 | parts := strings.Split(line, sep) |
| 91 | if len(parts) != 13 { |
| 92 | continue |
| 93 | } |
| 94 | |
| 95 | name := parts[1] |
| 96 | bytesRx, _ := strconv.ParseInt(parts[5], 10, 64) |
| 97 | bytesTx, _ := strconv.ParseInt(parts[6], 10, 64) |
| 98 | connSince, _ := strconv.ParseInt(parts[8], 10, 64) |
| 99 | |
| 100 | clients = append(clients, clientInfo{ |
| 101 | commonName: name, |
| 102 | bytesReceived: bytesRx, |
| 103 | bytesSent: bytesTx, |
| 104 | connectedSince: connSince, |
| 105 | }) |
| 106 | } |
| 107 | return clients |
| 108 | } |
| 109 | |
| 110 | func parseStaticKey(sc *bufio.Scanner) []clientInfo { |
| 111 | // https://github.com/OpenVPN/openvpn/blob/d5315a5d7400a26f1113bbc44766d49dd0c3688f/src/openvpn/sig.c#L283 |
| 112 | var info clientInfo |
| 113 | for sc.Scan() { |
| 114 | line := sc.Text() |
| 115 | if !strings.HasPrefix(line, "TCP/UDP") { |
| 116 | continue |
| 117 | } |
| 118 | i := strings.IndexByte(line, ',') |
| 119 | if i == -1 || len(line) == i { |
| 120 | continue |
| 121 | } |
| 122 | bytes, _ := strconv.ParseInt(line[i+1:], 10, 64) |
| 123 | switch line[:i] { |
| 124 | case "TCP/UDP read bytes": |
| 125 | info.bytesReceived += bytes |
| 126 | case "TCP/UDP write bytes": |
| 127 | info.bytesSent += bytes |
| 128 | } |
| 129 | } |
| 130 | return []clientInfo{info} |
| 131 | } |