/*
* returns a FRIEND_ADDRESS_SIZE byte address to give to others.
* format: [client_id (32 bytes)][nospam number (4 bytes)][checksum (2 bytes)]
*
*/
void getaddress(Messenger *m, uint8_t *address)
{
memcpy(address, m->net_crypto->self_public_key, crypto_box_PUBLICKEYBYTES);
uint32_t nospam = get_nospam(&(m->fr));
memcpy(address + crypto_box_PUBLICKEYBYTES, &nospam, sizeof(nospam));
uint16_t checksum = address_checksum(address, FRIEND_ADDRESS_SIZE - sizeof(checksum));
memcpy(address + crypto_box_PUBLICKEYBYTES + sizeof(nospam), &checksum, sizeof(checksum));
}
/* load the messenger from data of size length. */
int Messenger_load(Messenger *m, uint8_t *data, uint32_t length)
{
if (length == ~0)
return -1;
if (length < crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES + sizeof(uint32_t) * 3)
return -1;
length -= crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES + sizeof(uint32_t) * 3;
load_keys(data);
data += crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES;
uint32_t nospam;
memcpy(&nospam, data, sizeof(nospam));
set_nospam(nospam);
data += sizeof(nospam);
uint32_t size;
memcpy(&size, data, sizeof(size));
data += sizeof(size);
if (length < size)
return -1;
length -= size;
if (DHT_load(data, size) == -1)
return -1;
data += size;
memcpy(&size, data, sizeof(size));
data += sizeof(size);
if (length < size || size % sizeof(Friend) != 0)
return -1;
Friend *temp = malloc(size);
memcpy(temp, data, size);
uint16_t num = size / sizeof(Friend);
uint32_t i;
for (i = 0; i < num; ++i) {
if (temp[i].status >= 3) {
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); */
} else if (temp[i].status != 0) {
/* TODO: this is not a good way to do this. */
uint8_t address[FRIEND_ADDRESS_SIZE];
memcpy(address, temp[i].client_id, crypto_box_PUBLICKEYBYTES);
memcpy(address + crypto_box_PUBLICKEYBYTES, &(temp[i].friendrequest_nospam), sizeof(uint32_t));
uint16_t checksum = address_checksum(address, FRIEND_ADDRESS_SIZE - sizeof(checksum));
memcpy(address + crypto_box_PUBLICKEYBYTES + sizeof(uint32_t), &checksum, sizeof(checksum));
m_addfriend(m, address, temp[i].info, temp[i].info_size);
}
}
free(temp);
data += size;
length -= size;
uint16_t small_size;
if (length < sizeof(small_size))
return -1;
memcpy(&small_size, data, sizeof(small_size));
data += sizeof(small_size);
length -= sizeof(small_size);
if (length != small_size)
return -1;
setname(m, data, small_size);
return 0;
}
/*
* add a friend
* set the data that will be sent along with friend request
* address is the address of the friend (returned by getaddress of the friend you wish to add) it must be FRIEND_ADDRESS_SIZE bytes. TODO: add checksum.
* data is the data and length is the length
* returns the friend number if success
* return FA_TOOLONG if message length is too long
* return FAERR_NOMESSAGE if no message (message length must be >= 1 byte)
* return FAERR_OWNKEY if user's own key
* return FAERR_ALREADYSENT if friend request already sent or already a friend
* return FAERR_UNKNOWN for unknown error
* return FAERR_BADCHECKSUM if bad checksum in address
* return FAERR_SETNEWNOSPAM if the friend was already there but the nospam was different
* (the nospam for that friend was set to the new one)
* return FAERR_NOMEM if increasing the friend list size fails
*/
int m_addfriend(Messenger *m, uint8_t *address, uint8_t *data, uint16_t length)
{
if (length >= (MAX_DATA_SIZE - crypto_box_PUBLICKEYBYTES
- crypto_box_NONCEBYTES - crypto_box_BOXZEROBYTES
+ crypto_box_ZEROBYTES))
return FAERR_TOOLONG;
uint8_t client_id[crypto_box_PUBLICKEYBYTES];
memcpy(client_id, address, crypto_box_PUBLICKEYBYTES);
uint16_t check, checksum = address_checksum(address, FRIEND_ADDRESS_SIZE - sizeof(checksum));
memcpy(&check, address + crypto_box_PUBLICKEYBYTES + sizeof(uint32_t), sizeof(check));
if (check != checksum)
return FAERR_BADCHECKSUM;
if (length < 1)
return FAERR_NOMESSAGE;
if (memcmp(client_id, self_public_key, crypto_box_PUBLICKEYBYTES) == 0)
return FAERR_OWNKEY;
int friend_id = getfriend_id(m, client_id);
if (friend_id != -1) {
uint32_t nospam;
memcpy(&nospam, address + crypto_box_PUBLICKEYBYTES, sizeof(nospam));
if (m->friendlist[friend_id].friendrequest_nospam == nospam)
return FAERR_ALREADYSENT;
m->friendlist[friend_id].friendrequest_nospam = nospam;
return FAERR_SETNEWNOSPAM;
}
/* resize the friend list if necessary */
if (realloc_friendlist(m, m->numfriends + 1) != 0)
return FAERR_NOMEM;
memset(&(m->friendlist[m->numfriends]), 0, sizeof(Friend));
uint32_t i;
for (i = 0; i <= m->numfriends; ++i) {
if (m->friendlist[i].status == NOFRIEND) {
DHT_addfriend(client_id);
m->friendlist[i].status = FRIEND_ADDED;
m->friendlist[i].crypt_connection_id = -1;
m->friendlist[i].friendrequest_lastsent = 0;
m->friendlist[i].friendrequest_timeout = FRIENDREQUEST_TIMEOUT;
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 */
memcpy(&(m->friendlist[i].friendrequest_nospam), address + crypto_box_PUBLICKEYBYTES, sizeof(uint32_t));
if (m->numfriends == i)
++ m->numfriends;
return i;
}
}
return FAERR_UNKNOWN;
}
