How to disconnect the OTR session

[gemamegantara]

Hi chris, i've been looking to your code for a while, and i wondering how can i disconnect the OTR session with my friend ?
If I read from the source here http://www.cypherpunks.ca/otr/Protocol-v2-3.1.0.html , it's said we have to use TLV type 1 if we want to disconnect. And how i can do that with your code ? please I already spent two days thinking about it. :)

[chrisballinger]

OTRCodec.m is where all of the real communication with the OTR library happens. I actually don't know how to explicitly request a disconnect at the moment, but I'm sure if you looked at the Adium OTR plugin source or pidgin-otr plugin you'd be able to figure out what is going on.

[gemamegantara]

in libotr/message.c, I see this function

/* Put a connection into the PLAINTEXT state, first sending the
  other side a notice that we're doing so if we're currently ENCRYPTED,
  and we think he's logged in. */

void otrl_message_disconnect(OtrlUserState us, const OtrlMessageAppOps *ops, void *opdata, const char *accountname, const char *protocol, const char *username)
{
    ConnContext *context = otrl_context_find(us, username, accountname,
        protocol, 0, NULL, NULL, NULL);

    if (!context) return;

    if (context->msgstate == OTRL_MSGSTATE_ENCRYPTED &&
        context->their_keyid > 0 &&
        ops->is_logged_in &&
        ops->is_logged_in(opdata, accountname, protocol, username) == 1) {
    if (ops->inject_message) {
        char *encmsg = NULL;
        gcry_error_t err;
        OtrlTLV *tlv = otrl_tlv_new(OTRL_TLV_DISCONNECTED, 0, NULL);

        err = otrl_proto_create_data(&encmsg, context, "", tlv,
            OTRL_MSGFLAGS_IGNORE_UNREADABLE);
        if (!err) {
        ops->inject_message(opdata, accountname, protocol,
            username, encmsg);
        }
        free(encmsg);
    }
    }

    otrl_context_force_plaintext(context);
    if (ops->update_context_list) {
    ops->update_context_list(opdata);
    }
}

and I see in Adium OTR plugin source, it also called that function to disconnect.
So I try to add this code below in your OTR iOS :

+(void) disconnectSession:(NSString*)sender recipient:(NSString*)recipient protocol:(NSString*)protocol
{
    
    OTRProtocolManager *protocolManager = [OTRProtocolManager sharedInstance];
    
    OtrlUserState userstate = protocolManager.encryptionManager.userState;
    
    if(!userstate)
        NSLog(@"userstate is nil!");

    otrl_message_disconnect(userstate, &ui_ops,
                                 NULL, [sender UTF8String], [protocol UTF8String],
                                 [recipient UTF8String]);
  
}

but it does nothing. It suppose to call the inject_message function. Can you help me here Chris ?

[chrisballinger]

Hmm if it isn't forcing plaintext by injecting a message then perhaps err != nil?

[chrisballinger]

Were you able to figure out the problem? I'm going to close this issue for now, feel free to reopen it if you have any other questions.