4 files changed, 383 insertions, 308 deletions

diff --git a/core/Messenger.c b/core/Messenger.c
index 88f71b3d..58993a08 100644
--- a/core/Messenger.c
+++ b/core/Messenger.c
@@ -26,40 +26,8 @@
 
 #define MIN(a,b) (((a)<(b))?(a):(b))
 
-typedef struct {
-    uint8_t client_id[CLIENT_ID_SIZE];
-    int crypt_connection_id;
-    uint64_t friend_request_id; /* id of the friend request corresponding to the current friend request to the current friend. */
-    uint8_t status; /* 0 if no friend, 1 if added, 2 if friend request sent, 3 if confirmed friend, 4 if online. */
-    uint8_t info[MAX_DATA_SIZE]; /* the data that is sent during the friend requests we do */
-    uint8_t name[MAX_NAME_LENGTH];
-    uint8_t name_sent; /* 0 if we didn't send our name to this friend 1 if we have. */
-    uint8_t *statusmessage;
-    uint16_t statusmessage_length;
-    uint8_t statusmessage_sent;
-    USERSTATUS userstatus;
-    uint8_t userstatus_sent;
-    uint16_t info_size; /* length of the info */
-    uint32_t message_id; /* a semi-unique id used in read receipts */
-    uint8_t receives_read_receipts; /* shall we send read receipts to this person? */
-} Friend;
-
-uint8_t self_public_key[crypto_box_PUBLICKEYBYTES];
-
-static uint8_t self_name[MAX_NAME_LENGTH];
-static uint16_t self_name_length;
-
-static uint8_t self_statusmessage[MAX_STATUSMESSAGE_LENGTH];
-static uint16_t self_statusmessage_length;
-
-static USERSTATUS self_userstatus;
-
-static Friend *friendlist;
-static uint32_t numfriends;
-
-
-static void set_friend_status(int friendnumber, uint8_t status);
-static int write_cryptpacket_id(int friendnumber, uint8_t packet_id, uint8_t *data, uint32_t length);
+static void set_friend_status(Messenger *m, int friendnumber, uint8_t status);
+static int write_cryptpacket_id(Messenger *m, int friendnumber, uint8_t packet_id, uint8_t *data, uint32_t length);
 
 /* 1 if we are online
    0 if we are offline
@@ -67,24 +35,24 @@ static int write_cryptpacket_id(int friendnumber, uint8_t packet_id, uint8_t *da
 
 /* set the size of the friend list to numfriends
    return -1 if realloc fails */
-int realloc_friendlist(uint32_t num) {
-    Friend *newfriendlist = realloc(friendlist, num*sizeof(Friend));
+int realloc_friendlist(Messenger *m, uint32_t num) {
+    Friend *newfriendlist = realloc(m->friendlist, num*sizeof(Friend));
     if (newfriendlist == NULL)
         return -1;
     memset(&newfriendlist[num-1], 0, sizeof(Friend));
-    friendlist = newfriendlist;
+    m->friendlist = newfriendlist;
     return 0;
 }
 
 /* return the friend id associated to that public key.
    return -1 if no such friend */
-int getfriend_id(uint8_t *client_id)
+int getfriend_id(Messenger *m, uint8_t *client_id)
 {
     uint32_t i;
 
-    for (i = 0; i < numfriends; ++i) {
-        if (friendlist[i].status > 0)
-            if (memcmp(client_id, friendlist[i].client_id, crypto_box_PUBLICKEYBYTES) == 0)
+    for (i = 0; i < m->numfriends; ++i) {
+        if (m->friendlist[i].status > 0)
+            if (memcmp(client_id, m->friendlist[i].client_id, crypto_box_PUBLICKEYBYTES) == 0)
                 return i;
     }
 
@@ -95,13 +63,13 @@ int getfriend_id(uint8_t *client_id)
    make sure that client_id is of size CLIENT_ID_SIZE.
    return 0 if success
    return -1 if failure. */
-int getclient_id(int friend_id, uint8_t *client_id)
+int getclient_id(Messenger *m, int friend_id, uint8_t *client_id)
 {
-    if (friend_id >= numfriends || friend_id < 0)
+    if (friend_id >= m->numfriends || friend_id < 0)
         return -1;
 
-    if (friendlist[friend_id].status > 0) {
-        memcpy(client_id, friendlist[friend_id].client_id, CLIENT_ID_SIZE);
+    if (m->friendlist[friend_id].status > 0) {
+        memcpy(client_id, m->friendlist[friend_id].client_id, CLIENT_ID_SIZE);
         return 0;
     }
 
@@ -120,7 +88,7 @@ int getclient_id(int friend_id, uint8_t *client_id)
  * return FAERR_ALREADYSENT if friend request already sent or already a friend
  * return FAERR_UNKNOWN for unknown error
  */
-int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length)
+int m_addfriend(Messenger *m, uint8_t *client_id, uint8_t *data, uint16_t length)
 {
     if (length >= (MAX_DATA_SIZE - crypto_box_PUBLICKEYBYTES
                          - crypto_box_NONCEBYTES - crypto_box_BOXZEROBYTES
@@ -130,57 +98,57 @@ int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length)
         return FAERR_NOMESSAGE;
     if (memcmp(client_id, self_public_key, crypto_box_PUBLICKEYBYTES) == 0)
         return FAERR_OWNKEY;
-    if (getfriend_id(client_id) != -1)
+    if (getfriend_id(m, client_id) != -1)
         return FAERR_ALREADYSENT;
 
     /* resize the friend list if necessary */
-    realloc_friendlist(numfriends + 1);
+    realloc_friendlist(m, m->numfriends + 1);
 
     uint32_t i;
-    for (i = 0; i <= numfriends; ++i)  {
-        if (friendlist[i].status == NOFRIEND) {
+    for (i = 0; i <= m->numfriends; ++i)  {
+        if (m->friendlist[i].status == NOFRIEND) {
             DHT_addfriend(client_id);
-            friendlist[i].status = FRIEND_ADDED;
-            friendlist[i].crypt_connection_id = -1;
-            friendlist[i].friend_request_id = -1;
-            memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
-            friendlist[i].statusmessage = calloc(1, 1);
-            friendlist[i].statusmessage_length = 1;
-            friendlist[i].userstatus = USERSTATUS_NONE;
-            memcpy(friendlist[i].info, data, length);
-            friendlist[i].info_size = length;
-            friendlist[i].message_id = 0;
-            friendlist[i].receives_read_receipts = 1; /* default: YES */
-
-            ++numfriends;
+            m->friendlist[i].status = FRIEND_ADDED;
+            m->friendlist[i].crypt_connection_id = -1;
+            m->friendlist[i].friend_request_id = -1;
+            memcpy(m->friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
+            m->friendlist[i].statusmessage = calloc(1, 1);
+            m->friendlist[i].statusmessage_length = 1;
+            m->friendlist[i].userstatus = USERSTATUS_NONE;
+            memcpy(m->friendlist[i].info, data, length);
+            m->friendlist[i].info_size = length;
+            m->friendlist[i].message_id = 0;
+            m->friendlist[i].receives_read_receipts = 1; /* default: YES */
+
+            ++ m->numfriends;
             return i;
         }
     }
     return FAERR_UNKNOWN;
 }
 
-int m_addfriend_norequest(uint8_t * client_id)
+int m_addfriend_norequest(Messenger *m, uint8_t * client_id)
 {
-    if (getfriend_id(client_id) != -1)
+    if (getfriend_id(m, client_id) != -1)
         return -1;
 
     /* resize the friend list if necessary */
-    realloc_friendlist(numfriends + 1);
+    realloc_friendlist(m, m->numfriends + 1);
 
     uint32_t i;
-    for (i = 0; i <= numfriends; ++i) {
-        if(friendlist[i].status == NOFRIEND) {
+    for (i = 0; i <= m->numfriends; ++i) {
+        if(m->friendlist[i].status == NOFRIEND) {
             DHT_addfriend(client_id);
-            friendlist[i].status = FRIEND_REQUESTED;
-            friendlist[i].crypt_connection_id = -1;
-            friendlist[i].friend_request_id = -1;
-            memcpy(friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
-            friendlist[i].statusmessage = calloc(1, 1);
-            friendlist[i].statusmessage_length = 1;
-            friendlist[i].userstatus = USERSTATUS_NONE;
-            friendlist[i].message_id = 0;
-            friendlist[i].receives_read_receipts = 1; /* default: YES */
-            ++numfriends;
+            m->friendlist[i].status = FRIEND_REQUESTED;
+            m->friendlist[i].crypt_connection_id = -1;
+            m->friendlist[i].friend_request_id = -1;
+            memcpy(m->friendlist[i].client_id, client_id, CLIENT_ID_SIZE);
+            m->friendlist[i].statusmessage = calloc(1, 1);
+            m->friendlist[i].statusmessage_length = 1;
+            m->friendlist[i].userstatus = USERSTATUS_NONE;
+            m->friendlist[i].message_id = 0;
+            m->friendlist[i].receives_read_receipts = 1; /* default: YES */
+            ++ m->numfriends;
             return i;
         }
     }
@@ -190,23 +158,23 @@ int m_addfriend_norequest(uint8_t * client_id)
 /* remove a friend
    return 0 if success
    return -1 if failure */
-int m_delfriend(int friendnumber)
+int m_delfriend(Messenger *m, int friendnumber)
 {
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return -1;
 
-    DHT_delfriend(friendlist[friendnumber].client_id);
-    crypto_kill(friendlist[friendnumber].crypt_connection_id);
-    free(friendlist[friendnumber].statusmessage);
-    memset(&friendlist[friendnumber], 0, sizeof(Friend));
+    DHT_delfriend(m->friendlist[friendnumber].client_id);
+    crypto_kill(m->friendlist[friendnumber].crypt_connection_id);
+    free(m->friendlist[friendnumber].statusmessage);
+    memset(&(m->friendlist[friendnumber]), 0, sizeof(Friend));
     uint32_t i;
 
-    for (i = numfriends; i != 0; --i) {
-        if (friendlist[i-1].status != NOFRIEND)
+    for (i = m->numfriends; i != 0; --i) {
+        if (m->friendlist[i-1].status != NOFRIEND)
             break;
     }
-    numfriends = i;
-    realloc_friendlist(numfriends + 1);
+    m->numfriends = i;
+    realloc_friendlist(m, m->numfriends + 1);
 
     return 0;
 }
@@ -216,31 +184,31 @@ int m_delfriend(int friendnumber)
    return FRIEND_REQUESTED if the friend request was sent
    return FRIEND_ADDED if the friend was added
    return NOFRIEND if there is no friend with that number */
-int m_friendstatus(int friendnumber)
+int m_friendstatus(Messenger *m, int friendnumber)
 {
-    if (friendnumber < 0 || friendnumber >= numfriends)
+    if (friendnumber < 0 || friendnumber >= m->numfriends)
         return NOFRIEND;
-    return friendlist[friendnumber].status;
+    return m->friendlist[friendnumber].status;
 }
 
 /* send a text chat message to an online friend
    return the message id if packet was successfully put into the send queue
    return 0 if it was not */
-uint32_t m_sendmessage(int friendnumber, uint8_t *message, uint32_t length)
+uint32_t m_sendmessage(Messenger *m, int friendnumber, uint8_t *message, uint32_t length)
 {
-    if (friendnumber < 0 || friendnumber >= numfriends)
+    if (friendnumber < 0 || friendnumber >= m->numfriends)
         return 0;
-    uint32_t msgid = ++friendlist[friendnumber].message_id;
+    uint32_t msgid = ++m->friendlist[friendnumber].message_id;
     if (msgid == 0)
         msgid = 1; /* otherwise, false error */
-    if(m_sendmessage_withid(friendnumber, msgid, message, length)) {
+    if(m_sendmessage_withid(m, friendnumber, msgid, message, length)) {
         return msgid;
     }
-    
+
     return 0;
 }
 
-uint32_t m_sendmessage_withid(int friendnumber, uint32_t theid, uint8_t *message, uint32_t length)
+uint32_t m_sendmessage_withid(Messenger *m, int friendnumber, uint32_t theid, uint8_t *message, uint32_t length)
 {
     if (length >= (MAX_DATA_SIZE - sizeof(theid)))
         return 0;
@@ -248,34 +216,34 @@ uint32_t m_sendmessage_withid(int friendnumber, uint32_t theid, uint8_t *message
     theid = htonl(theid);
     memcpy(temp, &theid, sizeof(theid));
     memcpy(temp + sizeof(theid), message, length);
-    return write_cryptpacket_id(friendnumber, PACKET_ID_MESSAGE, temp, length + sizeof(theid));
+    return write_cryptpacket_id(m, friendnumber, PACKET_ID_MESSAGE, temp, length + sizeof(theid));
 }
 
 /* send an action to an online friend
    return 1 if packet was successfully put into the send queue
    return 0 if it was not */
-int m_sendaction(int friendnumber, uint8_t *action, uint32_t length)
+int m_sendaction(Messenger *m, int friendnumber, uint8_t *action, uint32_t length)
 {
-    return write_cryptpacket_id(friendnumber, PACKET_ID_ACTION, action, length);
+    return write_cryptpacket_id(m, friendnumber, PACKET_ID_ACTION, action, length);
 }
 
 /* send a name packet to friendnumber
    length is the length with the NULL terminator*/
-static int m_sendname(int friendnumber, uint8_t * name, uint16_t length)
+static int m_sendname(Messenger *m, int friendnumber, uint8_t * name, uint16_t length)
 {
     if(length > MAX_NAME_LENGTH || length == 0)
         return 0;
-    return write_cryptpacket_id(friendnumber, PACKET_ID_NICKNAME, name, length);
+    return write_cryptpacket_id(m, friendnumber, PACKET_ID_NICKNAME, name, length);
 }
 
 /* set the name of a friend
    return 0 if success
    return -1 if failure */
-static int setfriendname(int friendnumber, uint8_t * name)
+static int setfriendname(Messenger *m, int friendnumber, uint8_t * name)
 {
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return -1;
-    memcpy(friendlist[friendnumber].name, name, MAX_NAME_LENGTH);
+    memcpy(m->friendlist[friendnumber].name, name, MAX_NAME_LENGTH);
     return 0;
 }
 
@@ -285,15 +253,15 @@ static int setfriendname(int friendnumber, uint8_t * name)
    length is the length of name with the NULL terminator
    return 0 if success
    return -1 if failure */
-int setname(uint8_t * name, uint16_t length)
+int setname(Messenger *m, uint8_t * name, uint16_t length)
 {
     if (length > MAX_NAME_LENGTH || length == 0)
         return -1;
-    memcpy(self_name, name, length);
-    self_name_length = length;
+    memcpy(m->name, name, length);
+    m->name_length = length;
     uint32_t i;
-    for (i = 0; i < numfriends; ++i)
-        friendlist[i].name_sent = 0;
+    for (i = 0; i < m->numfriends; ++i)
+        m->friendlist[i].name_sent = 0;
     return 0;
 }
 
@@ -301,10 +269,10 @@ int setname(uint8_t * name, uint16_t length)
    put it in name
    name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH bytes.
    return the length of the name */
-uint16_t getself_name(uint8_t *name)
+uint16_t getself_name(Messenger *m, uint8_t *name)
 {
-    memcpy(name, self_name, self_name_length);
-    return self_name_length;
+    memcpy(name, m->name, m->name_length);
+    return m->name_length;
 }
 
 /* get name of friendnumber
@@ -312,272 +280,298 @@ uint16_t getself_name(uint8_t *name)
    name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH bytes.
    return 0 if success
    return -1 if failure */
-int getname(int friendnumber, uint8_t * name)
+int getname(Messenger *m, int friendnumber, uint8_t * name)
 {
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return -1;
-    memcpy(name, friendlist[friendnumber].name, MAX_NAME_LENGTH);
+    memcpy(name, m->friendlist[friendnumber].name, MAX_NAME_LENGTH);
     return 0;
 }
 
-int m_set_statusmessage(uint8_t *status, uint16_t length)
+int m_set_statusmessage(Messenger *m, uint8_t *status, uint16_t length)
 {
     if (length > MAX_STATUSMESSAGE_LENGTH)
         return -1;
-    memcpy(self_statusmessage, status, length);
-    self_statusmessage_length = length;
+    memcpy(m->statusmessage, status, length);
+    m->statusmessage_length = length;
 
     uint32_t i;
-    for (i = 0; i < numfriends; ++i)
-        friendlist[i].statusmessage_sent = 0;
+    for (i = 0; i < m->numfriends; ++i)
+        m->friendlist[i].statusmessage_sent = 0;
     return 0;
 }
 
-int m_set_userstatus(USERSTATUS status)
+int m_set_userstatus(Messenger *m, USERSTATUS status)
 {
     if (status >= USERSTATUS_INVALID) {
         return -1;
     }
-    self_userstatus = status;
+    m->userstatus = status;
     uint32_t i;
-    for (i = 0; i < numfriends; ++i)
-        friendlist[i].userstatus_sent = 0;
+    for (i = 0; i < m->numfriends; ++i)
+        m->friendlist[i].userstatus_sent = 0;
     return 0;
 }
 
 /*  return the size of friendnumber's user status
     guaranteed to be at most MAX_STATUSMESSAGE_LENGTH */
-int m_get_statusmessage_size(int friendnumber)
+int m_get_statusmessage_size(Messenger *m, int friendnumber)
 {
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return -1;
-    return friendlist[friendnumber].statusmessage_length;
+    return m->friendlist[friendnumber].statusmessage_length;
 }
 
 /*  copy the user status of friendnumber into buf, truncating if needed to maxlen
     bytes, use m_get_statusmessage_size to find out how much you need to allocate */
-int m_copy_statusmessage(int friendnumber, uint8_t * buf, uint32_t maxlen)
+int m_copy_statusmessage(Messenger *m, int friendnumber, uint8_t * buf, uint32_t maxlen)
 {
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return -1;
     memset(buf, 0, maxlen);
-    memcpy(buf, friendlist[friendnumber].statusmessage, MIN(maxlen, MAX_STATUSMESSAGE_LENGTH) - 1);
+    memcpy(buf, m->friendlist[friendnumber].statusmessage, MIN(maxlen, MAX_STATUSMESSAGE_LENGTH) - 1);
     return 0;
 }
 
-int m_copy_self_statusmessage(uint8_t * buf, uint32_t maxlen)
+int m_copy_self_statusmessage(Messenger *m, uint8_t * buf, uint32_t maxlen)
 {
     memset(buf, 0, maxlen);
-    memcpy(buf, self_statusmessage, MIN(maxlen, MAX_STATUSMESSAGE_LENGTH) - 1);
+    memcpy(buf, m->statusmessage, MIN(maxlen, MAX_STATUSMESSAGE_LENGTH) - 1);
     return 0;
 }
 
-USERSTATUS m_get_userstatus(int friendnumber)
+USERSTATUS m_get_userstatus(Messenger *m, int friendnumber)
 {
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return USERSTATUS_INVALID;
-    USERSTATUS status = friendlist[friendnumber].userstatus;
+    USERSTATUS status = m->friendlist[friendnumber].userstatus;
     if (status >= USERSTATUS_INVALID) {
         status = USERSTATUS_NONE;
     }
     return status;
 }
 
-USERSTATUS m_get_self_userstatus(void)
+USERSTATUS m_get_self_userstatus(Messenger *m)
 {
-    return self_userstatus;
+    return m->userstatus;
 }
 
-static int send_statusmessage(int friendnumber, uint8_t * status, uint16_t length)
+static int send_statusmessage(Messenger *m, int friendnumber, uint8_t * status, uint16_t length)
 {
-    return write_cryptpacket_id(friendnumber, PACKET_ID_STATUSMESSAGE, status, length);
+    return write_cryptpacket_id(m, friendnumber, PACKET_ID_STATUSMESSAGE, status, length);
 }
 
-static int send_userstatus(int friendnumber, USERSTATUS status)
+static int send_userstatus(Messenger *m, int friendnumber, USERSTATUS status)
 {
     uint8_t stat = status;
-    return write_cryptpacket_id(friendnumber, PACKET_ID_USERSTATUS, &stat, sizeof(stat));
+    return write_cryptpacket_id(m, friendnumber, PACKET_ID_USERSTATUS, &stat, sizeof(stat));
 }
 
-static int set_friend_statusmessage(int friendnumber, uint8_t * status, uint16_t length)
+static int set_friend_statusmessage(Messenger *m, int friendnumber, uint8_t * status, uint16_t length)
 {
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return -1;
     uint8_t *newstatus = calloc(length, 1);
     memcpy(newstatus, status, length);
-    free(friendlist[friendnumber].statusmessage);
-    friendlist[friendnumber].statusmessage = newstatus;
-    friendlist[friendnumber].statusmessage_length = length;
+    free(m->friendlist[friendnumber].statusmessage);
+    m->friendlist[friendnumber].statusmessage = newstatus;
+    m->friendlist[friendnumber].statusmessage_length = length;
     return 0;
 }
 
-static void set_friend_userstatus(int friendnumber, USERSTATUS status)
+static void set_friend_userstatus(Messenger *m, int friendnumber, USERSTATUS status)
 {
-    friendlist[friendnumber].userstatus = status;
+    m->friendlist[friendnumber].userstatus = status;
 }
 
 /* Sets whether we send read receipts for friendnumber. */
-void m_set_sends_receipts(int friendnumber, int yesno)
+void m_set_sends_receipts(Messenger *m, int friendnumber, int yesno)
 {
     if (yesno != 0 || yesno != 1)
         return;
-    if (friendnumber >= numfriends || friendnumber < 0)
+    if (friendnumber >= m->numfriends || friendnumber < 0)
         return;
-    friendlist[friendnumber].receives_read_receipts = yesno;
+    m->friendlist[friendnumber].receives_read_receipts = yesno;
 }
 
 /* static void (*friend_request)(uint8_t *, uint8_t *, uint16_t);
 static uint8_t friend_request_isset = 0; */
 /* set the function that will be executed when a friend request is received. */
-void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
+void m_callback_friendrequest(Messenger *m, void (*function)(uint8_t *, uint8_t *, uint16_t, void*), void* userdata)
 {
-    callback_friendrequest(function);
+    callback_friendrequest(function, userdata);
 }
 
-static void (*friend_message)(int, uint8_t *, uint16_t);
-static uint8_t friend_message_isset = 0;
-
 /* set the function that will be executed when a message from a friend is received. */
-void m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t))
+void m_callback_friendmessage(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata)
 {
-    friend_message = function;
-    friend_message_isset = 1;
+    m->friend_message = function;
+    m->friend_message_isset = 1;
+    m->friend_message_userdata = userdata;
 }
 
-static void (*friend_action)(int, uint8_t *, uint16_t);
-static uint8_t friend_action_isset = 0;
-void m_callback_action(void (*function)(int, uint8_t *, uint16_t))
+void m_callback_action(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata)
 {
-    friend_action = function;
-    friend_action_isset = 1;
+    m->friend_action = function;
+    m->friend_action_isset = 1;
+    m->friend_action_userdata = userdata;
 }
 
-static void (*friend_namechange)(int, uint8_t *, uint16_t);
-static uint8_t friend_namechange_isset = 0;
-void m_callback_namechange(void (*function)(int, uint8_t *, uint16_t))
+void m_callback_namechange(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata)
 {
-    friend_namechange = function;
-    friend_namechange_isset = 1;
+    m->friend_namechange = function;
+    m->friend_namechange_isset = 1;
+    m->friend_namechange_userdata = userdata;
 }
 
-static void (*friend_statusmessagechange)(int, uint8_t *, uint16_t);
-static uint8_t friend_statusmessagechange_isset = 0;
-void m_callback_statusmessage(void (*function)(int, uint8_t *, uint16_t))
+void m_callback_statusmessage(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata)
 {
-    friend_statusmessagechange = function;
-    friend_statusmessagechange_isset = 1;
+    m->friend_statusmessagechange = function;
+    m->friend_statusmessagechange_isset = 1;
+    m->friend_statuschange_userdata = userdata;
 }
 
-static void (*friend_userstatuschange)(int, USERSTATUS);
-static uint8_t friend_userstatuschange_isset = 0;
-void m_callback_userstatus(void (*function)(int, USERSTATUS))
+void m_callback_userstatus(Messenger *m, void (*function)(Messenger *m, int, USERSTATUS, void*), void* userdata)
 {
-    friend_userstatuschange = function;
-    friend_userstatuschange_isset = 1;
+    m->friend_userstatuschange = function;
+    m->friend_userstatuschange_isset = 1;
+    m->friend_userstatuschange_userdata = userdata;
 }
 
-static void (*read_receipt)(int, uint32_t);
-static uint8_t read_receipt_isset = 0;
-void m_callback_read_receipt(void (*function)(int, uint32_t))
+void m_callback_read_receipt(Messenger *m, void (*function)(Messenger *m, int, uint32_t, void*), void* userdata)
 {
-    read_receipt = function;
-    read_receipt_isset = 1;
+    m->read_receipt = function;
+    m->read_receipt_isset = 1;
+    m->read_receipt_userdata = userdata;
 }
 
-static void (*friend_connectionstatuschange)(int, uint8_t);
-static uint8_t friend_connectionstatuschange_isset = 0;
-void m_callback_connectionstatus(void (*function)(int, uint8_t))
+void m_callback_connectionstatus(Messenger *m, void (*function)(Messenger *m, int, uint8_t, void*), void* userdata)
 {
-    friend_connectionstatuschange = function;
-    friend_connectionstatuschange_isset = 1;
+    m->friend_connectionstatuschange = function;
+    m->friend_connectionstatuschange_isset = 1;
+    m->friend_connectionstatuschange_userdata = userdata;
 }
 
-static void check_friend_connectionstatus(int friendnumber, uint8_t status)
+static void check_friend_connectionstatus(Messenger *m, int friendnumber, uint8_t status)
 {
-    if (!friend_connectionstatuschange_isset)
+    if (!m->friend_connectionstatuschange_isset)
         return;
     if (status == NOFRIEND)
         return;
-    const uint8_t was_connected = friendlist[friendnumber].status == FRIEND_ONLINE;
+    const uint8_t was_connected = m->friendlist[friendnumber].status == FRIEND_ONLINE;
     const uint8_t is_connected = status == FRIEND_ONLINE;
     if (is_connected != was_connected)
-        friend_connectionstatuschange(friendnumber, is_connected);
+        m->friend_connectionstatuschange(m, friendnumber, is_connected, m->friend_connectionstatuschange_userdata);
 }
 
-static void set_friend_status(int friendnumber, uint8_t status)
+void set_friend_status(Messenger *m, int friendnumber, uint8_t status)
 {
-    check_friend_connectionstatus(friendnumber, status);
-    friendlist[friendnumber].status = status;
+    check_friend_connectionstatus(m, friendnumber, status);
+    m->friendlist[friendnumber].status = status;
 }
 
-static int write_cryptpacket_id(int friendnumber, uint8_t packet_id, uint8_t *data, uint32_t length)
+int write_cryptpacket_id(Messenger *m, int friendnumber, uint8_t packet_id, uint8_t *data, uint32_t length)
 {
-    if (friendnumber < 0 || friendnumber >= numfriends)
+    if (friendnumber < 0 || friendnumber >= m->numfriends)
         return 0;
-    if (length >= MAX_DATA_SIZE || friendlist[friendnumber].status != FRIEND_ONLINE)
+    if (length >= MAX_DATA_SIZE || m->friendlist[friendnumber].status != FRIEND_ONLINE)
         return 0;
     uint8_t packet[length + 1];
     packet[0] = packet_id;
     memcpy(packet + 1, data, length);
-    return write_cryptpacket(friendlist[friendnumber].crypt_connection_id, packet, length + 1);
+    return write_cryptpacket(m->friendlist[friendnumber].crypt_connection_id, packet, length + 1);
+}
+
+<<<<<<< HEAD
+=======
+#define PORT 33445
+/* run this at startup */
+Messenger * initMessenger(void)
+{
+    Messenger *m = calloc(1, sizeof(Messenger));
+    if( ! m )
+        return 0;
+
+    new_keys();
+    m_set_statusmessage(m, (uint8_t*)"Online", sizeof("Online"));
+    initNetCrypto();
+    IP ip;
+    ip.i = 0;
+
+    if(init_networking(ip,PORT) == -1)
+        return 0;
+
+    DHT_init();
+    LosslessUDP_init();
+    friendreq_init();
+    LANdiscovery_init();
+
+    return m;
 }
 
+/* run this before closing shop */
+void cleanupMessenger(Messenger *m){
+    /* FIXME TODO it seems no one frees friendlist or all the elements status */
+    free(m);
+}
+
+>>>>>>> upstream/master
 //TODO: make this function not suck.
-static void doFriends(void)
+void doFriends(Messenger *m)
 {
     /* TODO: add incoming connections and some other stuff. */
     uint32_t i;
     int len;
     uint8_t temp[MAX_DATA_SIZE];
-    for (i = 0; i < numfriends; ++i) {
-        if (friendlist[i].status == FRIEND_ADDED) {
-            int fr = send_friendrequest(friendlist[i].client_id, friendlist[i].info, friendlist[i].info_size);
+    for (i = 0; i < m->numfriends; ++i) {
+        if (m->friendlist[i].status == FRIEND_ADDED) {
+            int fr = send_friendrequest(m->friendlist[i].client_id, m->friendlist[i].info, m->friendlist[i].info_size);
             if (fr == 0) /* TODO: This needs to be fixed so that it sends the friend requests a couple of times in case of packet loss */
-                set_friend_status(i, FRIEND_REQUESTED);
+                set_friend_status(m, i, FRIEND_REQUESTED);
             else if (fr > 0)
-                set_friend_status(i, FRIEND_REQUESTED);
+                set_friend_status(m, i, FRIEND_REQUESTED);
         }
-        if (friendlist[i].status == FRIEND_REQUESTED || friendlist[i].status == FRIEND_CONFIRMED) { /* friend is not online */
-            if (friendlist[i].status == FRIEND_REQUESTED) {
-                if (friendlist[i].friend_request_id + 10 < unix_time()) { /*I know this is hackish but it should work.*/
-                    send_friendrequest(friendlist[i].client_id, friendlist[i].info, friendlist[i].info_size);
-                    friendlist[i].friend_request_id = unix_time();
+        if (m->friendlist[i].status == FRIEND_REQUESTED || m->friendlist[i].status == FRIEND_CONFIRMED) { /* friend is not online */
+            if (m->friendlist[i].status == FRIEND_REQUESTED) {
+                if (m->friendlist[i].friend_request_id + 10 < unix_time()) { /*I know this is hackish but it should work.*/
+                    send_friendrequest(m->friendlist[i].client_id, m->friendlist[i].info, m->friendlist[i].info_size);
+                    m->friendlist[i].friend_request_id = unix_time();
                 }
             }
-            IP_Port friendip = DHT_getfriendip(friendlist[i].client_id);
-            switch (is_cryptoconnected(friendlist[i].crypt_connection_id)) {
+            IP_Port friendip = DHT_getfriendip(m->friendlist[i].client_id);
+            switch (is_cryptoconnected(m->friendlist[i].crypt_connection_id)) {
             case 0:
                 if (friendip.ip.i > 1)
-                    friendlist[i].crypt_connection_id = crypto_connect(friendlist[i].client_id, friendip);
+                    m->friendlist[i].crypt_connection_id = crypto_connect(m->friendlist[i].client_id, friendip);
                 break;
             case 3: /*  Connection is established */
-                set_friend_status(i, FRIEND_ONLINE);
-                friendlist[i].name_sent = 0;
-                friendlist[i].userstatus_sent = 0;
-                friendlist[i].statusmessage_sent = 0;
+                set_friend_status(m, i, FRIEND_ONLINE);
+                m->friendlist[i].name_sent = 0;
+                m->friendlist[i].userstatus_sent = 0;
+                m->friendlist[i].statusmessage_sent = 0;
                 break;
             case 4:
-                crypto_kill(friendlist[i].crypt_connection_id);
-                friendlist[i].crypt_connection_id = -1;
+                crypto_kill(m->friendlist[i].crypt_connection_id);
+                m->friendlist[i].crypt_connection_id = -1;
                 break;
             default:
                 break;
             }
         }
-        while (friendlist[i].status == FRIEND_ONLINE) { /* friend is online */
-            if (friendlist[i].name_sent == 0) {
-                if (m_sendname(i, self_name, self_name_length))
-                    friendlist[i].name_sent = 1;
+        while (m->friendlist[i].status == FRIEND_ONLINE) { /* friend is online */
+            if (m->friendlist[i].name_sent == 0) {
+                if (m_sendname(m, i, m->name, m->name_length))
+                    m->friendlist[i].name_sent = 1;
             }
-            if (friendlist[i].statusmessage_sent == 0) {
-                if (send_statusmessage(i, self_statusmessage, self_statusmessage_length))
-                    friendlist[i].statusmessage_sent = 1;
+            if (m->friendlist[i].statusmessage_sent == 0) {
+                if (send_statusmessage(m, i, m->statusmessage, m->statusmessage_length))
+                    m->friendlist[i].statusmessage_sent = 1;
             }
-            if (friendlist[i].userstatus_sent == 0) {
-                if (send_userstatus(i, self_userstatus))
-                    friendlist[i].userstatus_sent = 1;
+            if (m->friendlist[i].userstatus_sent == 0) {
+                if (send_userstatus(m, i, m->userstatus))
+                    m->friendlist[i].userstatus_sent = 1;
             }
-            len = read_cryptpacket(friendlist[i].crypt_connection_id, temp);
+            len = read_cryptpacket(m->friendlist[i].crypt_connection_id, temp);
             uint8_t packet_id = temp[0];
             uint8_t* data = temp + 1;
             int data_length = len - 1;
@@ -586,10 +580,10 @@ static void doFriends(void)
                 case PACKET_ID_NICKNAME: {
                     if (data_length >= MAX_NAME_LENGTH || data_length == 0)
                         break;
-                    if(friend_namechange_isset)
-                        friend_namechange(i, data, data_length);
-                    memcpy(friendlist[i].name, data, data_length);
-                    friendlist[i].name[data_length - 1] = 0; /* make sure the NULL terminator is present. */
+                    if(m->friend_namechange_isset)
+                        m->friend_namechange(m, i, data, data_length, m->friend_namechange_userdata);
+                    memcpy(m->friendlist[i].name, data, data_length);
+                    m->friendlist[i].name[data_length - 1] = 0; /* make sure the NULL terminator is present. */
                     break;
                 }
                 case PACKET_ID_STATUSMESSAGE: {
@@ -597,9 +591,10 @@ static void doFriends(void)
                         break;
                     uint8_t *status = calloc(MIN(data_length, MAX_STATUSMESSAGE_LENGTH), 1);
                     memcpy(status, data, MIN(data_length, MAX_STATUSMESSAGE_LENGTH));
-                    if (friend_statusmessagechange_isset)
-                        friend_statusmessagechange(i, status, MIN(data_length, MAX_STATUSMESSAGE_LENGTH));
-                    set_friend_statusmessage(i, status, MIN(data_length, MAX_STATUSMESSAGE_LENGTH));
+                    if (m->friend_statusmessagechange_isset)
+                        m->friend_statusmessagechange(m, i, status, MIN(data_length, MAX_STATUSMESSAGE_LENGTH),
+                                                      m->friend_statuschange_userdata);
+                    set_friend_statusmessage(m, i, status, MIN(data_length, MAX_STATUSMESSAGE_LENGTH));
                     free(status);
                     break;
                 }
@@ -607,9 +602,9 @@ static void doFriends(void)
                     if (data_length != 1)
                         break;
                     USERSTATUS status = data[0];
-                    if (friend_userstatuschange_isset)
-                        friend_userstatuschange(i, status);
-                    set_friend_userstatus(i, status);
+                    if (m->friend_userstatuschange_isset)
+                        m->friend_userstatuschange(m, i, status, m->friend_userstatuschange_userdata);
+                    set_friend_userstatus(m, i, status);
                     break;
                 }
                 case PACKET_ID_MESSAGE: {
@@ -617,16 +612,16 @@ static void doFriends(void)
                     uint8_t message_id_length = 4;
                     uint8_t *message = data + message_id_length;
                     uint16_t message_length = data_length - message_id_length;
-                    if (friendlist[i].receives_read_receipts) {
-                        write_cryptpacket_id(i, PACKET_ID_RECEIPT, message_id, message_id_length);
+                    if (m->friendlist[i].receives_read_receipts) {
+                        write_cryptpacket_id(m, i, PACKET_ID_RECEIPT, message_id, message_id_length);
                     }
-                    if (friend_message_isset)
-                        (*friend_message)(i, message, message_length);
+                    if (m->friend_message_isset)
+                        (*m->friend_message)(m, i, message, message_length, m->friend_message_userdata);
                     break;
                 }
                 case PACKET_ID_ACTION: {
-                    if (friend_action_isset)
-                        (*friend_action)(i, data, data_length);
+                    if (m->friend_action_isset)
+                        (*m->friend_action)(m, i, data, data_length, m->friend_action_userdata);
                     break;
                 }
                 case PACKET_ID_RECEIPT: {
@@ -635,16 +630,16 @@ static void doFriends(void)
                         break;
                     memcpy(&msgid, data, sizeof(msgid));
                     msgid = ntohl(msgid);
-                    if (read_receipt_isset)
-                        (*read_receipt)(i, msgid);
+                    if (m->read_receipt_isset)
+                        (*m->read_receipt)(m, i, msgid, m->read_receipt_userdata);
                     break;
                 }
                 }
             } else {
-                if (is_cryptoconnected(friendlist[i].crypt_connection_id) == 4) { /* if the connection timed out, kill it */
-                    crypto_kill(friendlist[i].crypt_connection_id);
-                    friendlist[i].crypt_connection_id = -1;
-                    set_friend_status(i, FRIEND_CONFIRMED);
+                if (is_cryptoconnected(m->friendlist[i].crypt_connection_id) == 4) { /* if the connection timed out, kill it */
+                    crypto_kill(m->friendlist[i].crypt_connection_id);
+                    m->friendlist[i].crypt_connection_id = -1;
+                    set_friend_status(m, i, FRIEND_CONFIRMED);
                 }
                 break;
             }
@@ -652,20 +647,20 @@ static void doFriends(void)
     }
 }
 
-static void doInbound(void)
+void doInbound(Messenger *m)
 {
     uint8_t secret_nonce[crypto_box_NONCEBYTES];
     uint8_t public_key[crypto_box_PUBLICKEYBYTES];
     uint8_t session_key[crypto_box_PUBLICKEYBYTES];
     int inconnection = crypto_inbound(public_key, secret_nonce, session_key);
     if (inconnection != -1) {
-        int friend_id = getfriend_id(public_key);
+        int friend_id = getfriend_id(m, public_key);
         if (friend_id != -1) {
-            crypto_kill(friendlist[friend_id].crypt_connection_id);
-            friendlist[friend_id].crypt_connection_id =
+            crypto_kill(m->friendlist[friend_id].crypt_connection_id);
+            m->friendlist[friend_id].crypt_connection_id =
                 accept_crypto_inbound(inconnection, public_key, secret_nonce, session_key);
 
-            set_friend_status(friend_id, FRIEND_CONFIRMED);
+            set_friend_status(m, friend_id, FRIEND_CONFIRMED);
         }
     }
 }
@@ -676,7 +671,11 @@ static void doInbound(void)
 #define LAN_DISCOVERY_INTERVAL 60
 
 /*Send a LAN discovery packet every LAN_DISCOVERY_INTERVAL seconds*/
+<<<<<<< HEAD
 static int LANdiscovery_timercallback(timer* t, void* ignore)
+=======
+void LANdiscovery(Messenger *m)
+>>>>>>> upstream/master
 {
     send_LANdiscovery(htons(PORT));
     timer_start(t, LAN_DISCOVERY_INTERVAL);
@@ -707,9 +706,10 @@ int initMessenger(void)
 }
 
 /* the main loop that needs to be run at least 200 times per second. */
-void doMessenger(void)
+void doMessenger(Messenger *m)
 {
     networking_poll();
+<<<<<<< HEAD
     timer_poll();
         
     doDHT();
@@ -717,17 +717,26 @@ void doMessenger(void)
     doNetCrypto();
     doInbound();
     doFriends();
+=======
+
+    doDHT();
+    doLossless_UDP();
+    doNetCrypto();
+    doInbound(m);
+    doFriends(m);
+    LANdiscovery(m);
+>>>>>>> upstream/master
 }
 
 /* returns the size of the messenger data (for saving) */
-uint32_t Messenger_size(void)
+uint32_t Messenger_size(Messenger *m)
 {
     return crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES
-           + sizeof(uint32_t) + DHT_size() + sizeof(uint32_t) + sizeof(Friend) * numfriends;
+           + sizeof(uint32_t) + DHT_size() + sizeof(uint32_t) + sizeof(Friend) * m->numfriends;
 }
 
 /* save the messenger in data of size Messenger_size() */
-void Messenger_save(uint8_t *data)
+void Messenger_save(Messenger *m, uint8_t *data)
 {
     save_keys(data);
     data += crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES;
@@ -736,14 +745,14 @@ void Messenger_save(uint8_t *data)
     data += sizeof(size);
     DHT_save(data);
     data += size;
-    size = sizeof(Friend) * numfriends;
+    size = sizeof(Friend) * m->numfriends;
     memcpy(data, &size, sizeof(size));
     data += sizeof(size);
-    memcpy(data, friendlist, sizeof(Friend) * numfriends);
+    memcpy(data, m->friendlist, sizeof(Friend) * m->numfriends);
 }
 
 /* load the messenger from data of size length. */
-int Messenger_load(uint8_t * data, uint32_t length)
+int Messenger_load(Messenger *m, uint8_t * data, uint32_t length)
 {
     if (length == ~0)
         return -1;
@@ -775,11 +784,12 @@ int Messenger_load(uint8_t * data, uint32_t length)
     uint32_t i;
     for (i = 0; i < num; ++i) {
         if(temp[i].status != 0) {
-            int fnum = m_addfriend_norequest(temp[i].client_id);
-            setfriendname(fnum, temp[i].name);
+            int fnum = m_addfriend_norequest(m, temp[i].client_id);
+            setfriendname(m, fnum, temp[i].name);
             /* set_friend_statusmessage(fnum, temp[i].statusmessage, temp[i].statusmessage_length); */
         }
     }
     free(temp);
     return 0;
 }
+
diff --git a/core/Messenger.h b/core/Messenger.h
index 9352cfbb..fa69d104 100644
--- a/core/Messenger.h
+++ b/core/Messenger.h
@@ -73,6 +73,66 @@ typedef enum {
     USERSTATUS_INVALID
 } USERSTATUS;
 
+typedef struct {
+    uint8_t client_id[CLIENT_ID_SIZE];
+    int crypt_connection_id;
+    uint64_t friend_request_id; /* id of the friend request corresponding to the current friend request to the current friend. */
+    uint8_t status; /* 0 if no friend, 1 if added, 2 if friend request sent, 3 if confirmed friend, 4 if online. */
+    uint8_t info[MAX_DATA_SIZE]; /* the data that is sent during the friend requests we do */
+    uint8_t name[MAX_NAME_LENGTH];
+    uint8_t name_sent; /* 0 if we didn't send our name to this friend 1 if we have. */
+    uint8_t *statusmessage;
+    uint16_t statusmessage_length;
+    uint8_t statusmessage_sent;
+    USERSTATUS userstatus;
+    uint8_t userstatus_sent;
+    uint16_t info_size; /* length of the info */
+    uint32_t message_id; /* a semi-unique id used in read receipts */
+    uint8_t receives_read_receipts; /* shall we send read receipts to this person? */
+} Friend;
+
+typedef struct Messenger {
+    uint8_t public_key[crypto_box_PUBLICKEYBYTES];
+
+    uint8_t name[MAX_NAME_LENGTH];
+    uint16_t name_length;
+
+    uint8_t statusmessage[MAX_STATUSMESSAGE_LENGTH];
+    uint16_t statusmessage_length;
+
+    USERSTATUS userstatus;
+
+    Friend *friendlist;
+    uint32_t numfriends;
+
+    void (*friend_message)(struct Messenger *m, int, uint8_t *, uint16_t, void*);
+    uint8_t friend_message_isset;
+    void* friend_message_userdata;
+    void (*friend_action)(struct Messenger *m, int, uint8_t *, uint16_t, void*);
+    uint8_t friend_action_isset;
+    void* friend_action_userdata;
+    void (*friend_namechange)(struct Messenger *m, int, uint8_t *, uint16_t, void*);
+    uint8_t friend_namechange_isset;
+    void* friend_namechange_userdata;
+    void (*friend_statusmessagechange)(struct Messenger *m, int, uint8_t *, uint16_t, void*);
+    uint8_t friend_statusmessagechange_isset;
+    void* friend_statusmessagechange_userdata;
+    void (*friend_userstatuschange)(struct Messenger *m, int, USERSTATUS, void*);
+    uint8_t friend_userstatuschange_isset;
+    void* friend_userstatuschange_userdata;
+    void (*read_receipt)(struct Messenger *m, int, uint32_t, void*);
+    uint8_t read_receipt_isset;
+    void* read_receipt_userdata;
+    void (*friend_statuschange)(struct Messenger *m, int, uint8_t, void*);
+    uint8_t friend_statuschange_isset;
+    void* friend_statuschange_userdata;
+    void (*friend_connectionstatuschange)(struct Messenger *m, int, uint8_t, void*);
+    uint8_t friend_connectionstatuschange_isset;
+    void* friend_connectionstatuschange_userdata;
+
+
+} Messenger;
+
 /*
  * add a friend
  * set the data that will be sent along with friend request
@@ -85,33 +145,33 @@ typedef enum {
  * return -4 if friend request already sent or already a friend
  * return -5 for unknown error
  */
-int m_addfriend(uint8_t *client_id, uint8_t *data, uint16_t length);
+int m_addfriend(Messenger *m, uint8_t *client_id, uint8_t *data, uint16_t length);
 
 
 /* add a friend without sending a friendrequest.
     returns the friend number if success
     return -1 if failure. */
-int m_addfriend_norequest(uint8_t *client_id);
+int m_addfriend_norequest(Messenger *m, uint8_t *client_id);
 
 /* return the friend id associated to that client id.
     return -1 if no such friend */
-int getfriend_id(uint8_t *client_id);
+int getfriend_id(Messenger *m, uint8_t *client_id);
 
 /* copies the public key associated to that friend id into client_id buffer.
     make sure that client_id is of size CLIENT_ID_SIZE.
     return 0 if success
     return -1 if failure */
-int getclient_id(int friend_id, uint8_t *client_id);
+int getclient_id(Messenger *m, int friend_id, uint8_t *client_id);
 
 /* remove a friend */
-int m_delfriend(int friendnumber);
+int m_delfriend(Messenger *m, int friendnumber);
 
 /* return 4 if friend is online
     return 3 if friend is confirmed
     return 2 if the friend request was sent
     return 1 if the friend was added
     return 0 if there is no friend with that number */
-int m_friendstatus(int friendnumber);
+int m_friendstatus(Messenger *m, int friendnumber);
 
 /* send a text chat message to an online friend
     returns the message id if packet was successfully put into the send queue
@@ -120,13 +180,13 @@ int m_friendstatus(int friendnumber);
     if one is received.
     m_sendmessage_withid will send a message with the id of your choosing,
     however we can generate an id for you by calling plain m_sendmessage. */
-uint32_t m_sendmessage(int friendnumber, uint8_t *message, uint32_t length);
-uint32_t m_sendmessage_withid(int friendnumber, uint32_t theid, uint8_t *message, uint32_t length);
+uint32_t m_sendmessage(Messenger *m, int friendnumber, uint8_t *message, uint32_t length);
+uint32_t m_sendmessage_withid(Messenger *m, int friendnumber, uint32_t theid, uint8_t *message, uint32_t length);
 
 /* send an action to an online friend
     returns 1 if packet was successfully put into the send queue
     return 0 if it was not */
-int m_sendaction(int friendnumber, uint8_t *action, uint32_t length);
+int m_sendaction(Messenger *m, int friendnumber, uint8_t *action, uint32_t length);
 
 /* Set our nickname
    name must be a string of maximum MAX_NAME_LENGTH length.
@@ -134,73 +194,73 @@ int m_sendaction(int friendnumber, uint8_t *action, uint32_t length);
    length is the length of name with the NULL terminator
    return 0 if success
    return -1 if failure */
-int setname(uint8_t *name, uint16_t length);
+int setname(Messenger *m, uint8_t *name, uint16_t length);
 
 /* get our nickname
    put it in name
    return the length of the name*/
-uint16_t getself_name(uint8_t *name);
+uint16_t getself_name(Messenger *m, uint8_t *name);
 
 /* get name of friendnumber
     put it in name
     name needs to be a valid memory location with a size of at least MAX_NAME_LENGTH (128) bytes.
     return 0 if success
     return -1 if failure */
-int getname(int friendnumber, uint8_t *name);
+int getname(Messenger *m, int friendnumber, uint8_t *name);
 
 /* set our user status
     you are responsible for freeing status after
     returns 0 on success, -1 on failure */
-int m_set_statusmessage(uint8_t *status, uint16_t length);
-int m_set_userstatus(USERSTATUS status);
+int m_set_statusmessage(Messenger *m, uint8_t *status, uint16_t length);
+int m_set_userstatus(Messenger *m, USERSTATUS status);
 
 /* return the length of friendnumber's status message,
     including null
     pass it into malloc */
-int m_get_statusmessage_size(int friendnumber);
+int m_get_statusmessage_size(Messenger *m, int friendnumber);
 
 /* copy friendnumber's status message into buf, truncating if size is over maxlen
     get the size you need to allocate from m_get_statusmessage_size
     The self variant will copy our own status message. */
-int m_copy_statusmessage(int friendnumber, uint8_t *buf, uint32_t maxlen);
-int m_copy_self_statusmessage(uint8_t *buf, uint32_t maxlen);
+int m_copy_statusmessage(Messenger *m, int friendnumber, uint8_t *buf, uint32_t maxlen);
+int m_copy_self_statusmessage(Messenger *m, uint8_t *buf, uint32_t maxlen);
 
 /* Return one of USERSTATUS values.
  * Values unknown to your application should be represented as USERSTATUS_NONE.
  * As above, the self variant will return our own USERSTATUS.
  * If friendnumber is invalid, this shall return USERSTATUS_INVALID. */
-USERSTATUS m_get_userstatus(int friendnumber);
-USERSTATUS m_get_self_userstatus(void);
+USERSTATUS m_get_userstatus(Messenger *m, int friendnumber);
+USERSTATUS m_get_self_userstatus(Messenger *m);
 
 /* Sets whether we send read receipts for friendnumber.
  * This function is not lazy, and it will fail if yesno is not (0 or 1).*/
-void m_set_sends_receipts(int friendnumber, int yesno);
+void m_set_sends_receipts(Messenger *m, int friendnumber, int yesno);
 
 /* set the function that will be executed when a friend request is received.
     function format is function(uint8_t * public_key, uint8_t * data, uint16_t length) */
-void m_callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t));
+void m_callback_friendrequest(Messenger *m, void (*function)(uint8_t *, uint8_t *, uint16_t, void*), void* userdata);
 
 /* set the function that will be executed when a message from a friend is received.
     function format is: function(int friendnumber, uint8_t * message, uint32_t length) */
-void m_callback_friendmessage(void (*function)(int, uint8_t *, uint16_t));
+void m_callback_friendmessage(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata);
 
 /* set the function that will be executed when an action from a friend is received.
     function format is: function(int friendnumber, uint8_t * action, uint32_t length) */
-void m_callback_action(void (*function)(int, uint8_t *, uint16_t));
+void m_callback_action(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata);
 
 /* set the callback for name changes
     function(int friendnumber, uint8_t *newname, uint16_t length)
     you are not responsible for freeing newname */
-void m_callback_namechange(void (*function)(int, uint8_t *, uint16_t));
+void m_callback_namechange(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata);
 
 /* set the callback for status message changes
     function(int friendnumber, uint8_t *newstatus, uint16_t length)
     you are not responsible for freeing newstatus */
-void m_callback_statusmessage(void (*function)(int, uint8_t *, uint16_t));
+void m_callback_statusmessage(Messenger *m, void (*function)(Messenger *m, int, uint8_t *, uint16_t, void*), void* userdata);
 
 /* set the callback for status type changes
     function(int friendnumber, USERSTATUS kind) */
-void m_callback_userstatus(void (*function)(int, USERSTATUS));
+void m_callback_userstatus(Messenger *m, void (*function)(Messenger *m, int, USERSTATUS, void*), void* userdata);
 
 /* set the callback for read receipts
     function(int friendnumber, uint32_t receipt)
@@ -209,7 +269,7 @@ void m_callback_userstatus(void (*function)(int, USERSTATUS));
     has been received on the other side. since core doesn't
     track ids for you, receipt may not correspond to any message
     in that case, you should discard it. */
-void m_callback_read_receipt(void (*function)(int, uint32_t));
+void m_callback_read_receipt(Messenger *m, void (*function)(Messenger *m, int, uint32_t, void*), void* userdata);
 
 /* set the callback for connection status changes
     function(int friendnumber, uint8_t status)
@@ -219,26 +279,30 @@ void m_callback_read_receipt(void (*function)(int, uint32_t));
     note that this callback is not called when adding friends, thus the "after
     being previously online" part. it's assumed that when adding friends,
     their connection status is offline. */
-void m_callback_connectionstatus(void (*function)(int, uint8_t));
+void m_callback_connectionstatus(Messenger *m, void (*function)(Messenger *m, int, uint8_t, void*), void* userdata);
 
 /* run this at startup
-    returns 0 if no connection problems
-    returns -1 if there are problems */
-int initMessenger(void);
+ *  returns allocated instance of Messenger on success
+ *  returns 0 if there are problems */
+Messenger * initMessenger(void);
+
+/* run this before closing shop
+ * free all datastructures */
+void cleanupMessenger(Messenger *M);
 
 /* the main loop that needs to be run at least 200 times per second */
-void doMessenger(void);
+void doMessenger(Messenger *m);
 
 /* SAVING AND LOADING FUNCTIONS: */
 
 /* returns the size of the messenger data (for saving) */
-uint32_t Messenger_size(void);
+uint32_t Messenger_size(Messenger *m);
 
 /* save the messenger in data (must be allocated memory of size Messenger_size()) */
-void Messenger_save(uint8_t *data);
+void Messenger_save(Messenger *m, uint8_t *data);
 
 /* load the messenger from data of size length */
-int Messenger_load(uint8_t *data, uint32_t length);
+int Messenger_load(Messenger *m, uint8_t *data, uint32_t length);
 
 #ifdef __cplusplus
 }
diff --git a/core/friend_requests.c b/core/friend_requests.c
index 422cc028..5e9b447c 100644
--- a/core/friend_requests.c
+++ b/core/friend_requests.c
@@ -57,14 +57,15 @@ int send_friendrequest(uint8_t * public_key, uint8_t * data, uint32_t length)
     return num;
 }
 
-static void (*handle_friendrequest)(uint8_t *, uint8_t *, uint16_t);
+static void (*handle_friendrequest)(uint8_t *, uint8_t *, uint16_t, void*);
 static uint8_t handle_friendrequest_isset = 0;
-
+static void* handle_friendrequest_userdata;
 /* set the function that will be executed when a friend request is received. */
-void callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
+void callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t, void*), void* userdata)
 {
     handle_friendrequest = function;
     handle_friendrequest_isset = 1;
+    handle_friendrequest_userdata = userdata;
 }
 
 
@@ -121,7 +122,7 @@ static int friendreq_handlepacket(IP_Port source, uint8_t * packet, uint32_t len
                 return 1;
 
             addto_receivedlist(public_key);
-            (*handle_friendrequest)(public_key, data, len);
+            (*handle_friendrequest)(public_key, data, len, handle_friendrequest_userdata);
         } else { /* if request is not for us, try routing it. */
             if(route_packet(packet + 1, packet, length) == length)
                 return 0;
diff --git a/core/friend_requests.h b/core/friend_requests.h
index 708d8f66..f18107ce 100644
--- a/core/friend_requests.h
+++ b/core/friend_requests.h
@@ -37,7 +37,7 @@ int send_friendrequest(uint8_t *public_key, uint8_t *data, uint32_t length);
 
 /* set the function that will be executed when a friend request for us is received.
     function format is function(uint8_t * public_key, uint8_t * data, uint16_t length) */
-void callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t));
+void callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t, void*), void* userdata);
 
 /* sets up friendreq packet handlers */
 void friendreq_init(void);