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for extra safety, move message hash into header where it can be part

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of test whether message should be deleteted from sms inbox.
This commit is contained in:
Eric House 2012-04-24 07:19:52 -07:00
parent 9035f901b1
commit b68b8aa0d0
1 changed files with 21 additions and 21 deletions
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42
xwords4/android/XWords4/src/org/eehouse/android/xw4/SMSService.java
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@ -141,11 +141,11 @@ public class SMSService extends Service {
public static String toPublicFmt( String msg )
{
String result;
int msglen = msg.length() + 1 + XWApp.SMS_PUBLIC_HEADER.length();
int msglen = XWApp.SMS_PUBLIC_HEADER.length() + 4 + 1 + msg.length();
int urllen = INSTALL_URL.length();
result = String.format( "%s %s%s", XWApp.SMS_PUBLIC_HEADER,
msglen + urllen < MAX_SMS_LEN ? INSTALL_URL : "",
String result = String.format( "%s%04X %s%s", XWApp.SMS_PUBLIC_HEADER,
msg.hashCode() & 0xFFFF,
msglen + urllen < MAX_SMS_LEN? INSTALL_URL : "",
msg );
return result;
}
@ -154,9 +154,22 @@ public class SMSService extends Service {
{
String result = null;
if ( null != msg && msg.startsWith( XWApp.SMS_PUBLIC_HEADER ) ) {
int index = msg.lastIndexOf( " " );
if ( 0 <= index ) {
result = msg.substring( index + 1 );
// Number format exception etc. can result from malicious
// messages. Be safe: use try;
try {
String tmp = msg.substring( 1 + msg.lastIndexOf( " " ) );
int headerLen = XWApp.SMS_PUBLIC_HEADER.length();
String hashString =
msg.substring( headerLen, headerLen + 4 );
int hashRead = Integer.parseInt( hashString, 16 );
int hashCode = 0xFFFF & tmp.hashCode();
if ( hashRead == hashCode ) {
result = tmp;
} else {
DbgUtils.logf( "fromPublicFmt: hash code mismatch" );
}
} catch( Exception e ) {
}
}
return result;
@ -324,14 +337,10 @@ public class SMSService extends Service {
throws java.io.IOException
{
DbgUtils.logf( "non-static SMSService.sendPacket()" );
int hash = Arrays.hashCode( bytes );
DbgUtils.logf( "SMSService: outgoing hash on %d bytes: %X",
bytes.length, hash );
ByteArrayOutputStream bas = new ByteArrayOutputStream( 128 );
DataOutputStream das = new DataOutputStream( bas );
das.writeByte( SMS_PROTO_VERSION );
das.writeByte( cmd.ordinal() );
das.writeInt( hash );
das.write( bytes, 0, bytes.length );
das.flush();
@ -472,18 +481,9 @@ public class SMSService extends Service {
proto );
} else {
SMS_CMD cmd = SMS_CMD.values()[dis.readByte()];
int hashRead = dis.readInt();
DbgUtils.logf( "SMSService: incoming hash: %X", hashRead );
byte[] rest = new byte[dis.available()];
dis.read( rest );
int hashComputed = Arrays.hashCode( rest );
if ( hashComputed == hashRead ) {
receive( cmd, rest, senderPhone );
} else {
DbgUtils.logf( "SMSService: incoming hashes on %d bytes "
+ "DON'T match: read: %X; figured: %X",
rest.length, hashRead, hashComputed );
}
receive( cmd, rest, senderPhone );
}
} catch ( java.io.IOException ioe ) {
DbgUtils.logf( "disAssemble: ioe: %s", ioe.toString() );