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package de.blinkt.openvpn;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Vector;
//! Openvpn Config FIle Parser, probably not 100% accurate but close enough
// And rember, this is valid :)
// --<foo>
// bar
// </foo>
public class ConfigParser {
private HashMap<String,Vector<String>> options = new HashMap<String, Vector<String>>();
private void parseConfig(String filename) throws IOException, ConfigParseError {
FileReader fr = new FileReader(filename);
BufferedReader br =new BufferedReader(fr);
int lineno=0;
while (true){
String line = br.readLine();
if(line==null)
break;
lineno++;
System.out.print("LINE:");
System.out.println(line);
Vector<String> args = parseline(line);
if(args.size() ==0)
continue;
if(args.get(0).startsWith("--"))
args.set(0, args.get(0).substring(2));
checkinlinefile(args,br);
options.put(args.get(0), args);
}
}
private void checkinlinefile(Vector<String> args, BufferedReader br) throws IOException, ConfigParseError {
String arg0 = args.get(0);
// CHeck for <foo>
if(arg0.startsWith("<") && arg0.endsWith(">")) {
String argname = arg0.substring(1, arg0.length()-1);
String inlinefile = "";
String endtag = String.format("</%s>",argname);
do {
String line = br.readLine();
if(line==null){
throw new ConfigParseError(String.format("No endtag </%s> for starttag <%s> found",argname,argname));
}
if(line.equals(endtag))
break;
else {
inlinefile+=line;
inlinefile+= "\n";
}
} while(true);
args.clear();
args.add(argname);
args.add(inlinefile);
}
}
enum linestate {
initial,
readin_single_quote
, reading_quoted, reading_unquoted, done}
private boolean space(char c) {
// I really hope nobody is using zero bytes inside his/her config file
// to sperate parameter but here we go:
return Character.isSpace(c) || c == '\0';
}
public class ConfigParseError extends Exception {
private static final long serialVersionUID = -60L;
public ConfigParseError(String msg) {
super(msg);
}
}
// adapted openvpn's parse function to java
private Vector<String> parseline(String line) throws ConfigParseError {
Vector<String> parameters = new Vector<String>();
if (line.length()==0)
return parameters;
linestate state = linestate.initial;
boolean backslash = false;
char out=0;
int pos=0;
String currentarg="";
do {
// Emulate the c parsing ...
char in;
if(pos < line.length())
in = line.charAt(pos);
else
in = '\0';
if (!backslash && in == '\\' && state != linestate.readin_single_quote)
{
backslash = true;
}
else
{
if (state == linestate.initial)
{
if (!space (in))
{
if (in == ';' || in == '#') /* comment */
break;
if (!backslash && in == '\"')
state = linestate.reading_quoted;
else if (!backslash && in == '\'')
state = linestate.readin_single_quote;
else
{
out = in;
state = linestate.reading_unquoted;
}
}
}
else if (state == linestate.reading_unquoted)
{
if (!backslash && space (in))
state = linestate.done;
else
out = in;
}
else if (state == linestate.reading_quoted)
{
if (!backslash && in == '\"')
state = linestate.done;
else
out = in;
}
else if (state == linestate.readin_single_quote)
{
if (in == '\'')
state = linestate.done;
else
out = in;
}
if (state == linestate.done)
{
/* ASSERT (parm_len > 0); */
state = linestate.initial;
parameters.add(currentarg);
currentarg = "";
out =0;
}
if (backslash && out!=0)
{
if (!(out == '\\' || out == '\"' || space (out)))
{
throw new ConfigParseError("Options warning: Bad backslash ('\\') usage");
}
}
backslash = false;
}
/* store parameter character */
if (out!=0)
{
currentarg+=out;
}
} while (pos++ < line.length());
return parameters;
}
void convertProfile() throws ConfigParseError{
VpnProfile newprofile = new VpnProfile("converted Profile");
// Pull, client, tls-client
if(options.containsKey("client") || options.containsKey("pull")) {
newprofile.mUsePull=true;
options.remove("pull");
options.remove("client");
}
if(options.containsKey("secret")){
newprofile.mAuthenticationType=VpnProfile.TYPE_STATICKEYS;
options.remove("secret");
}
if(options.containsKey("redirect-gateway")) {
options.remove("redirect-gateway");
newprofile.mUseDefaultRoute=true;
} else {
newprofile.mUseDefaultRoute=true;
}
Vector<String> mode = options.get("mode");
if (mode != null){
options.remove("mode");
if(mode.size() != 2)
throw new ConfigParseError("--mode has more than one parameter");
if(!mode.get(1).equals("p2p"))
throw new ConfigParseError("Invalid mode for --mode specified");
}
}
}
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