X-Git-Url: https://gitweb.ps.run/matrix_esp_thesis/blobdiff_plain/8d8ae609f0201ec4640738ff49b768e899695423..b231872efcb97e52856f5972efd161c6e9b03cd6:/src/matrix.c

diff --git a/src/matrix.c b/src/matrix.c
index 06409b8..40c2e5b 100644
--- a/src/matrix.c
+++ b/src/matrix.c
@@ -11,9 +11,11 @@
 
 #define ENCRYPTED_REQUEST_SIZE (1024*5)
 #define ENCRYPTED_EVENT_SIZE (1024*10)
-#define ROOMEVENT_REQUEST_SIZE 256
-#define ROOMEVENT_RESPONSE_SIZE 1024
-#define ROOMEVENT_URL "/_matrix/client/v3/rooms/%s/send/%s/%d"
+#define ROOM_SEND_REQUEST_SIZE 256
+#define ROOM_SEND_RESPONSE_SIZE 1024
+#define ROOM_SEND_URL "/_matrix/client/v3/rooms/%s/send/%s/%d"
+
+#define ROOMKEY_REQUEST_SIZE (1024*4)
 
 #define TODEVICE_EVENT_SIZE (1024*5)
 #define TODEVICE_URL "/_matrix/client/v3/sendToDevice/%s/%d"
@@ -31,9 +33,14 @@
 #define KEYS_CLAIM_REQUEST_SIZE 1024
 #define KEYS_CLAIM_RESPONSE_SIZE 1024
 
-#define JSON_QUERY_SIZE 128
+#define SYNC_TIMEOUT 5000
 
+#define JSON_QUERY_SIZE 128
+#define JSON_MAX_INDICES 100
+#define JSON_MAX_ENTRY_SIZE 1024
 
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
 
 void
 Randomize(
@@ -76,6 +83,69 @@ JsonEscape(
     return true;
 }
 
+bool
+JsonCanonicalize(
+    const char * sIn, int sInLen,
+    char * sOut, int sOutCap)
+{
+    snprintf(sOut, sOutCap, "{}");
+
+    int koff, klen, voff, vlen, vtype, off;
+
+    struct Key {
+        const char * ptr;
+        int len;
+    };
+
+    struct Key keys[JSON_MAX_INDICES];
+    int numKeys = 0;
+
+    for (off = 0; (off = mjson_next(sIn, sInLen, off, &koff, &klen, &voff, &vlen, &vtype)) != 0; ) {
+        keys[numKeys].ptr = sIn + koff;
+        keys[numKeys].len = klen;
+        numKeys++;
+    }
+
+    for (int i = 0; i < numKeys; i++) {
+        for (int j = i; j < numKeys; j++) {
+            if (
+                strncmp(
+                    keys[i].ptr,
+                    keys[j].ptr,
+                    MIN(keys[i].len, keys[j].len)
+                ) > 0
+            ) {
+                struct Key k = keys[i];
+                keys[i] = keys[j];
+                keys[j] = k;
+            }
+        }
+    }
+
+    for (int i = 0; i < numKeys; i++) {
+        char jp[JSON_QUERY_SIZE];
+        snprintf(jp, JSON_QUERY_SIZE, "$.%.*s", keys[i].len-2, keys[i].ptr+1);
+
+        const char * valPtr;
+        int valLen;
+        mjson_find(sIn, sInLen, jp, &valPtr, &valLen);
+        
+        static char newEntry[JSON_MAX_ENTRY_SIZE];
+        snprintf(newEntry, JSON_MAX_ENTRY_SIZE, "{%.*s:%.*s}", keys[i].len, keys[i].ptr, valLen, valPtr);
+
+        char * buffer = strdup(sOut);
+
+        struct mjson_fixedbuf fb = { sOut, sOutCap, 0 };
+        mjson_merge(buffer, strlen(buffer), newEntry, strlen(newEntry), mjson_print_fixed_buf, &fb);
+
+        free(buffer);
+    }
+
+    // TODO: recursively sort entries
+
+    return true;
+}
+
 bool JsonSign(
     MatrixClient * client,
     const char * sIn, int sInLen,
@@ -89,8 +159,8 @@ bool JsonSign(
     
     int signatureLen = res;
     
-    char thisSigningKey[DEVICE_KEY_SIZE];
-    MatrixOlmAccountGetSigningKey(&client->olmAccount, thisSigningKey, DEVICE_KEY_SIZE);
+    static char thisSigningKey[SIGNING_KEY_SIZE];
+    MatrixOlmAccountGetSigningKey(&client->olmAccount, thisSigningKey, SIGNING_KEY_SIZE);
 
     static char signatureJson[JSON_SIGNATURE_SIZE];
     int signatureJsonLen =
@@ -103,7 +173,8 @@ bool JsonSign(
                 "}"
             "}",
             client->userId,
-            "1",
+            //"1",
+            client->deviceId,
             signatureLen, signature);
 
     struct mjson_fixedbuf result = { sOut, sOutCap, 0 };
@@ -181,7 +252,35 @@ MatrixOlmAccountGetSigningKey(
     return true;
 }
 
-// TODO:in/outbound sessions
+bool
+MatrixOlmSessionFrom(
+    MatrixOlmSession * session,
+    OlmAccount * olmAccount,
+    const char * deviceId,
+    const char * deviceKey,
+    const char * encrypted)
+{
+    memset(session, 0, sizeof(MatrixOlmSession));
+
+    session->deviceId = deviceId;
+
+    session->session =
+        olm_session(session->memory);
+    
+    char * encryptedCopy = strdup(encrypted);
+
+    size_t res =
+        olm_create_inbound_session_from(session->session, olmAccount,
+            deviceKey, strlen(deviceKey),
+            encryptedCopy, strlen(encryptedCopy));
+    
+    if (res == olm_error()) {
+        printf("error olm:%s\n", olm_session_last_error(session->session));
+    }
+
+    return res != olm_error();
+}
+
 bool
 MatrixOlmSessionTo(
     MatrixOlmSession * session,
@@ -211,7 +310,7 @@ MatrixOlmSessionTo(
         printf("error olm:%s\n", olm_session_last_error(session->session));
     }
 
-    return session->session != NULL;
+    return res != olm_error();
 }
 
 bool
@@ -257,6 +356,85 @@ MatrixOlmSessionEncrypt(
     return res != olm_error();
 }
 
+bool
+MatrixOlmSessionDecrypt(
+    MatrixOlmSession * session,
+    size_t messageType,
+    char * encrypted,
+    char * outBuffer, int outBufferCap)
+{
+    static uint8_t random[OLM_ENCRYPT_RANDOM_SIZE];
+    Randomize(random, OLM_ENCRYPT_RANDOM_SIZE);
+
+    size_t res =
+        olm_decrypt(session->session,
+            messageType,
+            encrypted, strlen(encrypted),
+            outBuffer, outBufferCap);
+    
+    if (res != olm_error() && res < outBufferCap)
+        outBuffer[res] = '\0';
+
+    return res != olm_error();
+}
+
+bool
+MatrixMegolmInSessionInit(
+    MatrixMegolmInSession * session,
+    const char * roomId,
+    const char * sessionId,
+    const char * sessionKey, int sessionKeyLen)
+{
+    memset(session, 0, sizeof(MatrixMegolmInSession));
+    
+    strncpy(session->roomId, roomId, sizeof(session->roomId));
+    strncpy(session->id, sessionId, sizeof(session->id));
+    strncpy(session->key, sessionKey, sizeof(session->key));
+
+    session->session =
+        olm_inbound_group_session(session->memory);
+
+    size_t res =
+        olm_init_inbound_group_session(
+        // olm_import_inbound_group_session(
+            session->session,
+            (const uint8_t *)sessionKey, sessionKeyLen);
+    if (res == olm_error()) {
+        printf("Error initializing Megolm session: %s\n", olm_inbound_group_session_last_error(session->session));
+    }
+
+    return res != olm_error();
+}
+
+bool
+MatrixMegolmInSessionDecrypt(
+    MatrixMegolmInSession * session,
+    const char * encrypted, int encryptedLen,
+    char * outDecrypted, int outDecryptedCap)
+{
+    // uint8_t buffer[1024];
+    // memcpy(buffer, encrypted, encryptedLen);
+
+    uint32_t megolmInMessageIndex;
+
+    size_t res =
+        olm_group_decrypt(session->session,
+            (uint8_t *)encrypted, encryptedLen,
+            (uint8_t *)outDecrypted, outDecryptedCap,
+            &megolmInMessageIndex);
+    
+    printf("message index: %d\n", megolmInMessageIndex);
+    
+    if (res == olm_error()) {
+        printf("error decrypting megolm message: %s\n", olm_inbound_group_session_last_error(session->session));
+    }
+    else {
+        printf("decrypted len: %d\n", res);
+    }
+    
+    return true;
+}
+
 // https://matrix.org/docs/guides/end-to-end-encryption-implementation-guide#starting-a-megolm-session
 bool
 MatrixMegolmOutSessionInit(
@@ -510,7 +688,7 @@ MatrixClientUploadOnetimeKeys(
     static char requestBuffer[KEYS_UPLOAD_REQUEST_SIZE];
 
     mjson_snprintf(requestBuffer, KEYS_UPLOAD_REQUEST_SIZE,
-        "{\"one_time_keys\":{");
+        "{");
 
     static char onetimeKeysBuffer[1024];
     olm_account_one_time_keys(client->olmAccount.account,
@@ -524,14 +702,15 @@ MatrixClientUploadOnetimeKeys(
     while ((off = mjson_next(keys, keysLen, off, &koff, &klen, &voff, &vlen, &vtype)) != 0) {
         static char keyJson[JSON_ONETIME_KEY_SIZE];
         
-        snprintf(keyJson, JSON_ONETIME_KEY_SIZE,
-            "{\"key\":\"%.*s\"}",
-            vlen-2, keys + voff+1);
+        int keyJsonLen =
+            snprintf(keyJson, JSON_ONETIME_KEY_SIZE,
+                "{\"key\":\"%.*s\"}",
+                vlen-2, keys + voff+1);
 
         static char keyJsonSigned[JSON_ONETIME_KEY_SIGNED_SIZE];
 
         JsonSign(client,
-            keyJson, JSON_ONETIME_KEY_SIZE,
+            keyJson, keyJsonLen,
             keyJsonSigned, JSON_ONETIME_KEY_SIGNED_SIZE);
         
         mjson_snprintf(requestBuffer+strlen(requestBuffer), KEYS_UPLOAD_REQUEST_SIZE-strlen(requestBuffer),
@@ -540,13 +719,28 @@ MatrixClientUploadOnetimeKeys(
             keyJsonSigned);
     }
 
-    mjson_snprintf(requestBuffer+strlen(requestBuffer)-1, KEYS_UPLOAD_REQUEST_SIZE-strlen(requestBuffer),
-        "}}");
+    if (requestBuffer[strlen(requestBuffer)-1] == ',')
+        requestBuffer[strlen(requestBuffer)-1] = '\0';
+
+    mjson_snprintf(requestBuffer+strlen(requestBuffer), KEYS_UPLOAD_REQUEST_SIZE-strlen(requestBuffer),
+        "}");
+        
+    // static char onetimeKeysSignedBuffer[KEYS_UPLOAD_REQUEST_SIGNED_SIZE];
+    // JsonSign(client,
+    //     requestBuffer, strlen(requestBuffer),
+    //     onetimeKeysSignedBuffer, KEYS_UPLOAD_REQUEST_SIZE);
+        
+    // static char finalEvent[KEYS_UPLOAD_REQUEST_SIGNED_SIZE];
+    // snprintf(finalEvent, KEYS_UPLOAD_REQUEST_SIGNED_SIZE,
+    // "{\"one_time_keys\":%s}", onetimeKeysSignedBuffer);
+    static char finalEvent[KEYS_UPLOAD_REQUEST_SIGNED_SIZE];
+    snprintf(finalEvent, KEYS_UPLOAD_REQUEST_SIGNED_SIZE,
+    "{\"one_time_keys\":%s}", requestBuffer);
 
     static char responseBuffer[KEYS_UPLOAD_RESPONSE_SIZE];
     MatrixHttpPost(client,
         KEYS_UPLOAD_URL,
-        requestBuffer,
+        finalEvent,
         responseBuffer, KEYS_UPLOAD_RESPONSE_SIZE,
         true);
 
@@ -565,31 +759,35 @@ MatrixClientUploadDeviceKey(
 
     static char deviceKeysBuffer[KEYS_UPLOAD_REQUEST_SIZE];
 
-    mjson_snprintf(deviceKeysBuffer, KEYS_UPLOAD_REQUEST_SIZE,
-        "{\"device_keys\":{"
-            "\"algorithms\":[\"m.olm.v1.curve25519-aes-sha2\",\"m.megolm.v1.aes-sha2\"],"
-            "\"device_id\":\"%s\","
-            "\"keys\":{"
-                "\"curve25519:%s\":\"%s\","
-                "\"ed25519:%s\":\"%s\""
-            "},"
-            "\"user_id\":\"%s\""
-        "}}",
-        client->deviceId,
-        client->deviceId, thisDeviceKey,
-        client->deviceId, thisSigningKey,
-        client->userId);
+    int deviceKeysBufferLen =
+        mjson_snprintf(deviceKeysBuffer, KEYS_UPLOAD_REQUEST_SIZE,
+            "{"
+                "\"algorithms\":[\"m.olm.v1.curve25519-aes-sha2\",\"m.megolm.v1.aes-sha2\"],"
+                "\"device_id\":\"%s\","
+                "\"keys\":{"
+                    "\"curve25519:%s\":\"%s\","
+                    "\"ed25519:%s\":\"%s\""
+                "},"
+                "\"user_id\":\"%s\""
+            "}",
+            client->deviceId,
+            client->deviceId, thisDeviceKey,
+            client->deviceId, thisSigningKey,
+            client->userId);
 
     static char deviceKeysSignedBuffer[KEYS_UPLOAD_REQUEST_SIGNED_SIZE];
     JsonSign(client,
-        deviceKeysBuffer, KEYS_UPLOAD_REQUEST_SIZE,
+        deviceKeysBuffer, deviceKeysBufferLen,
         deviceKeysSignedBuffer, KEYS_UPLOAD_REQUEST_SIZE);
-
+    
+    static char finalEvent[KEYS_UPLOAD_REQUEST_SIGNED_SIZE];
+    snprintf(finalEvent, KEYS_UPLOAD_REQUEST_SIGNED_SIZE,
+    "{\"device_keys\":%s}", deviceKeysSignedBuffer);
 
     static char responseBuffer[KEYS_UPLOAD_RESPONSE_SIZE];
     MatrixHttpPost(client,
         KEYS_UPLOAD_URL,
-        deviceKeysSignedBuffer,
+        finalEvent,
         responseBuffer, KEYS_UPLOAD_RESPONSE_SIZE,
         true);
 
@@ -715,14 +913,14 @@ MatrixClientSendEvent(
 {    
     static char requestUrl[MAX_URL_LEN];
     sprintf(requestUrl,
-        ROOMEVENT_URL, roomId, msgType, (int)time(NULL));
+        ROOM_SEND_URL, roomId, msgType, (int)time(NULL));
 
-    static char responseBuffer[ROOMEVENT_RESPONSE_SIZE];
+    static char responseBuffer[ROOM_SEND_RESPONSE_SIZE];
     bool result =
         MatrixHttpPut(client,
             requestUrl,
             msgBody,
-            responseBuffer, ROOMEVENT_RESPONSE_SIZE,
+            responseBuffer, ROOM_SEND_RESPONSE_SIZE,
             true);
     
     return result;
@@ -738,7 +936,7 @@ MatrixClientSendEventEncrypted(
     const char * msgBody)
 {
     // event json
-    static char requestBuffer[ROOMEVENT_REQUEST_SIZE];
+    static char requestBuffer[ROOM_SEND_REQUEST_SIZE];
     sprintf(requestBuffer,
         "{"
         "\"type\":\"%s\","
@@ -751,7 +949,8 @@ MatrixClientSendEventEncrypted(
 
     // get megolm session
     MatrixMegolmOutSession * outSession;
-    MatrixClientGetMegolmOutSession(client, roomId, &outSession);
+    if (! MatrixClientGetMegolmOutSession(client, roomId, &outSession))
+        MatrixClientNewMegolmOutSession(client, roomId, &outSession);
         
     // encrypt
     static char encryptedBuffer[ENCRYPTED_REQUEST_SIZE];
@@ -793,15 +992,60 @@ MatrixClientSendEventEncrypted(
 bool
 MatrixClientSync(
     MatrixClient * client,
-    char * outSyncBuffer, int outSyncCap)
+    char * outSyncBuffer, int outSyncCap,
+    const char * nextBatch)
 {
+    // filter={\"event_fields\":[\"to_device\"]}
+    static char url[MAX_URL_LEN];
+    snprintf(url, MAX_URL_LEN,
+        "/_matrix/client/v3/sync?timeout=%d%s",
+        SYNC_TIMEOUT,
+        strlen(nextBatch) > 0 ? "&since=" : "");
+    
+    int index = strlen(url);
+
+    for (size_t i = 0; i < strlen(nextBatch); i++) {
+        char c = nextBatch[i];
+
+        if (c == '~') {
+            url[index++] = '%';
+            url[index++] = '7';
+            url[index++] = 'E';
+        }
+        else {
+            url[index++] = c;
+        }
+    }
+    url[index] = '\0';
+
     return
         MatrixHttpGet(client,
-            "/_matrix/client/v3/sync",
+            url,
             outSyncBuffer, outSyncCap,
             true);
 }
 
+// https://spec.matrix.org/v1.7/client-server-api/#get_matrixclientv3roomsroomideventeventid
+bool
+MatrixClientGetRoomEvent(
+    MatrixClient * client,
+    const char * roomId,
+    const char * eventId,
+    char * outEvent, int outEventCap)
+{
+    static char url[MAX_URL_LEN];
+    snprintf(url, MAX_URL_LEN,
+        "/_matrix/client/v3/rooms/%s/event/%s",
+            roomId,
+            eventId);
+
+    return
+        MatrixHttpGet(client,
+            url,
+            outEvent, outEventCap,
+            true);
+}
+
 bool
 MatrixClientShareMegolmOutSession(
     MatrixClient * client,
@@ -823,16 +1067,6 @@ MatrixClientShareMegolmOutSession(
         session->key
     );
 
-    // // get olm session
-    // MatrixOlmSession * olmSession;
-    // MatrixClientGetOlmSession(client, userId, deviceId, &olmSession);
-
-    // // encrypt
-    // char encryptedBuffer[KEY_SHARE_EVENT_LEN];
-    // MatrixOlmSessionEncrypt(olmSession,
-    //     eventBuffer,
-    //     encryptedBuffer, KEY_SHARE_EVENT_LEN);
-
     // send
     MatrixClientSendToDeviceEncrypted(client,
         userId,
@@ -874,23 +1108,6 @@ MatrixClientShareMegolmOutSessionTest(
     return true;
 }
 
-// bool
-// MatrixClientSetMegolmOutSession(
-//     MatrixClient * client,
-//     const char * roomId,
-//     MatrixMegolmOutSession session)
-// {
-//     if (client->numMegolmOutSessions < 10)
-//     {
-//         session.roomId = roomId;
-//         client->megolmOutSessions[client->numMegolmOutSessions] = session;
-//         client->numMegolmOutSessions++;
-
-//         return true;
-//     }
-//     return false;
-// }
-
 bool
 MatrixClientGetMegolmOutSession(
     MatrixClient * client,
@@ -906,8 +1123,27 @@ MatrixClientGetMegolmOutSession(
         }
     }
 
-    if (MatrixClientInitMegolmOutSession(client, roomId)) {
-        *outSession = &client->megolmOutSessions[client->numMegolmOutSessions-1];
+    return false;
+}
+
+bool
+MatrixClientNewMegolmOutSession(
+    MatrixClient * client,
+    const char * roomId,
+    MatrixMegolmOutSession ** outSession)
+{
+    if (client->numMegolmOutSessions < NUM_MEGOLM_SESSIONS)
+    {
+        MatrixMegolmOutSession * result =
+            &client->megolmOutSessions[client->numMegolmOutSessions];
+        
+        MatrixMegolmOutSessionInit(result,
+            roomId);
+
+        *outSession = result;
+
+        client->numMegolmOutSessions++;
+
         return true;
     }
 
@@ -915,25 +1151,137 @@ MatrixClientGetMegolmOutSession(
 }
 
 bool
-MatrixClientInitMegolmOutSession(
+MatrixClientGetMegolmInSession(
     MatrixClient * client,
-    const char * roomId)
+    const char * roomId, int roomIdLen,
+    const char * sessionId, int sessionIdLen,
+    MatrixMegolmInSession ** outSession)
 {
-    if (client->numMegolmOutSessions < NUM_MEGOLM_SESSIONS)
+    for (int i = 0; i < client->numMegolmInSessions; i++)
     {
-        MatrixMegolmOutSessionInit(
-            &client->megolmOutSessions[client->numMegolmOutSessions],
-            roomId);
+        if (strncmp(client->megolmInSessions[i].roomId, roomId, roomIdLen) == 0 &&
+            strncmp(client->megolmInSessions[i].id, sessionId, sessionIdLen) == 0)
+        {
+            *outSession = &client->megolmInSessions[i];
+            return true;
+        }
+    }
+
+    return false;
+}
+
+bool
+MatrixClientNewMegolmInSession(
+    MatrixClient * client,
+    const char * roomId,
+    const char * sessionId,
+    const char * sessionKey,
+    MatrixMegolmInSession ** outSession)
+{
+    if (client->numMegolmInSessions < NUM_MEGOLM_SESSIONS)
+    {
+        MatrixMegolmInSession * result =
+            &client->megolmInSessions[client->numMegolmInSessions];
         
-        client->numMegolmOutSessions++;
+        MatrixMegolmInSessionInit(result,
+            roomId,
+            sessionId,
+            sessionKey, strlen(sessionKey));
+        
+        *outSession = result;
+
+        client->numMegolmInSessions++;
+
+        return true;
+    }
+
+    return false;
+}
+
+bool
+MatrixClientRequestMegolmInSession(
+    MatrixClient * client,
+    const char * roomId,
+    const char * sessionId,
+    const char * senderKey,
+    const char * userId,
+    const char * deviceId)
+{
+    // TODO: cancel requests
+    MatrixClientSendDummy(client, userId, deviceId);
+
+    static char event[ROOMKEY_REQUEST_SIZE];
+    snprintf(event, ROOMKEY_REQUEST_SIZE,
+        "{"
+            "\"action\":\"request\","
+            "\"body\":{"
+                "\"algorithm\":\"m.megolm.v1.aes-sha2\","
+                "\"room_id\":\"%s\","
+                "\"sender_key\":\"%s\","
+                "\"session_id\":\"%s\""
+            "},"
+            "\"request_id\":\"%d\","
+            "\"requesting_device_id\":\"%s\""
+        "}",
+        roomId,
+        senderKey,
+        sessionId,
+        time(NULL),
+        client->deviceId);
+
+    
+    MatrixClientSendToDevice(client,
+        userId,
+        deviceId,
+        event,
+        "m.room_key_request");
+
+    return true;
+}
+
+bool
+MatrixClientGetOlmSessionIn(
+    MatrixClient * client,
+    const char * userId,
+    const char * deviceId,
+    const char * encrypted,
+    MatrixOlmSession ** outSession)
+{
+    for (int i = 0; i < client->numOlmSessions; i++)
+    {
+        if (strcmp(client->olmSessions[i].deviceId, deviceId) == 0)
+        {
+            *outSession = &client->olmSessions[i];
+            return true;
+        }
+    }
+
+    if (client->numOlmSessions < NUM_OLM_SESSIONS)
+    {
+        static char deviceKey[DEVICE_KEY_SIZE];
+        MatrixClientRequestDeviceKey(client,
+            deviceId,
+            deviceKey, DEVICE_KEY_SIZE);
+
+        MatrixOlmSessionFrom(
+            &client->olmSessions[client->numOlmSessions],
+            client->olmAccount.account,
+            deviceId,
+            deviceKey,
+            encrypted);
+
+        *outSession = &client->olmSessions[client->numOlmSessions];
+        
+        client->numOlmSessions++;
 
         return true;
     }
+
     return false;
 }
 
 bool
-MatrixClientGetOlmSession(
+MatrixClientGetOlmSessionOut(
     MatrixClient * client,
     const char * userId,
     const char * deviceId,
@@ -1004,14 +1352,16 @@ MatrixClientSendToDevice(
         deviceId,
         message);
 
-    static char responseBuffer[ROOMEVENT_RESPONSE_SIZE];
+    static char responseBuffer[ROOM_SEND_RESPONSE_SIZE];
     bool result =
         MatrixHttpPut(client,
             requestUrl,
             eventBuffer,
-            responseBuffer, ROOMEVENT_RESPONSE_SIZE,
+            responseBuffer, ROOM_SEND_RESPONSE_SIZE,
             true);
     
+    printf("%s\n", responseBuffer);
+    
     return result;
 }
 
@@ -1025,7 +1375,7 @@ MatrixClientSendToDeviceEncrypted(
 {
     // get olm session
     MatrixOlmSession * olmSession;
-    MatrixClientGetOlmSession(client, userId, deviceId, &olmSession);
+    MatrixClientGetOlmSessionOut(client, userId, deviceId, &olmSession);
 
     // create event json
     char targetDeviceKey[DEVICE_KEY_SIZE];
@@ -1056,8 +1406,6 @@ MatrixClientSendToDeviceEncrypted(
         userId, // recipient user id
         targetSigningKey, // recipient device key
         thisSigningKey);
-    
-    printf("%s\n", eventBuffer);
 
     // encrypt
     static char encryptedBuffer[ENCRYPTED_REQUEST_SIZE];
@@ -1097,6 +1445,20 @@ MatrixClientSendToDeviceEncrypted(
         "m.room.encrypted");
 }
 
+bool
+MatrixClientSendDummy(
+    MatrixClient * client,
+    const char * userId,
+    const char * deviceId)
+{
+    return MatrixClientSendToDeviceEncrypted(
+        client,
+        userId,
+        deviceId,
+        "{}",
+        "m.dummy");
+}
+
 bool
 MatrixClientFindDevice(
     MatrixClient * client,