/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
static int write_packet_TCP_secure_connection(TCP_Secure_Connection *con, const uint8_t *data, uint16_t length,
bool priority)
{
if (length + crypto_box_MACBYTES > MAX_PACKET_SIZE) {
return -1;
}
bool sendpriority = 1;
if (send_pending_data(con) == -1) {
if (priority) {
sendpriority = 0;
} else {
return 0;
}
}
uint8_t packet[sizeof(uint16_t) + length + crypto_box_MACBYTES];
uint16_t c_length = htons(length + crypto_box_MACBYTES);
memcpy(packet, &c_length, sizeof(uint16_t));
int len = encrypt_data_symmetric(con->shared_key, con->sent_nonce, data, length, packet + sizeof(uint16_t));
if ((unsigned int)len != (sizeof(packet) - sizeof(uint16_t))) {
return -1;
}
if (priority) {
len = sendpriority ? send(con->sock, (const char *)packet, sizeof(packet), MSG_NOSIGNAL) : 0;
if (len <= 0) {
len = 0;
}
increment_nonce(con->sent_nonce);
if ((unsigned int)len == sizeof(packet)) {
return 1;
}
return add_priority(con, packet, sizeof(packet), len);
}
len = send(con->sock, (const char *)packet, sizeof(packet), MSG_NOSIGNAL);
if (len <= 0) {
return 0;
}
increment_nonce(con->sent_nonce);
if ((unsigned int)len == sizeof(packet)) {
return 1;
}
memcpy(con->last_packet, packet, sizeof(packet));
con->last_packet_length = sizeof(packet);
con->last_packet_sent = len;
return 1;
}
static BOOL
set_priority(int *plist, int psize, uschar *s, pri_item *index, int isize,
uschar *which)
{
int sep = 0;
BOOL first = TRUE;
uschar *t;
while ((t = string_nextinlist(&s, &sep, big_buffer, big_buffer_size)) != NULL)
{
int i;
BOOL exclude = t[0] == '!';
if (first && !exclude) plist[0] = 0;
first = FALSE;
for (i = 0; i < isize; i++)
{
uschar *ss = strstric(t, index[i].name, FALSE);
if (ss != NULL)
{
uschar *endss = ss + Ustrlen(index[i].name);
if ((ss == t || !isalnum(ss[-1])) && !isalnum(*endss))
{
if (exclude)
remove_priority(plist, index[i].values);
else
{
if (!add_priority(plist, psize, index[i].values))
{
log_write(0, LOG_MAIN|LOG_PANIC, "GnuTLS init failed: %s "
"priority table overflow", which);
return FALSE;
}
}
}
}
}
}
DEBUG(D_tls)
{
int *ptr = plist;
debug_printf("adjusted %s priorities:", which);
while (*ptr != 0) debug_printf(" %d", *ptr++);
debug_printf("\n");
}
return TRUE;
}