/*
* Sends a message through a locally bound port (the bound port already has an associated
* receiver address so it is sufficient to just supply the bound port number). In order
* for the remote system to correctly create a bound port for replies back to the sending
* system, it needs to know the sender's listening port (specified by local_unbound_port).
* The msg parameter is a pointer to a data payload that the user wishes to send and does not
* include a network header; your implementation of minimsg_send must construct the header
* before calling network_send_pkt(). The return value of this function is the number of
* data payload bytes sent not inclusive of the header.
* Return -1 if len is larger then the maximum package size.
*/
int
minimsg_send(miniport_t local_unbound_port, miniport_t local_bound_port,
minimsg_t msg, int len)
{
struct mini_header hdr;
network_address_t dest;
int sent;
if (NULL == local_unbound_port || NULL == local_bound_port
|| UNBOUNDED != local_unbound_port->type
|| BOUNDED != local_bound_port->type
|| NULL == msg || len < 0 || len > MINIMSG_MAX_MSG_SIZE)
return -1;
minimsg_packhdr(&hdr, local_unbound_port, local_bound_port);
network_address_copy(local_bound_port->bound.addr, dest);
sent = miniroute_send_pkt(dest, MINIMSG_HDRSIZE, (char*)&hdr, len, msg);
return sent - MINIMSG_HDRSIZE < 0 ? -1 : sent - MINIMSG_HDRSIZE;
}
/* Sends a message through a locally bound port (the bound port already has an associated
* receiver address so it is sufficient to just supply the bound port number). In order
* for the remote system to correctly create a bound port for replies back to the sending
* system, it needs to know the sender's listening port (specified by local_unbound_port).
* The msg parameter is a pointer to a data payload that the user wishes to send and does not
* include a network header; your implementation of minimsg_send must construct the header
* before calling miniroute_send_pkt(). The return value of this function is the number of
* data payload bytes sent not inclusive of the header. Returns -1 on error.
* Fails if msg is too long.
*/
int
minimsg_send(miniport_t local_unbound_port, miniport_t local_bound_port, minimsg_t msg, int len) {
struct mini_header hdr;
network_address_t dst_addr;
if (len > MINIMSG_MAX_MSG_SIZE) {
return -1;
}
if (local_unbound_port == NULL ||
local_unbound_port->p_type != UNBOUND_PORT ||
local_unbound_port->p_num >= BOUND_PORT_START ||
miniport_array[local_unbound_port->p_num] != local_unbound_port) {
return -1;
}
if (local_bound_port == NULL ||
local_bound_port->p_type != BOUND_PORT ||
local_bound_port->p_num < BOUND_PORT_START ||
miniport_array[local_bound_port->p_num] != local_bound_port) {
return -1;
}
network_address_copy(local_bound_port->u.bound.dest_addr, dst_addr);
hdr.protocol = PROTOCOL_MINIDATAGRAM;
pack_address(hdr.source_address, my_addr);
pack_unsigned_short(hdr.source_port, local_unbound_port->p_num);
pack_address(hdr.destination_address, local_bound_port->u.bound.dest_addr);
pack_unsigned_short(hdr.destination_port, local_bound_port->u.bound.dest_num);
if (miniroute_send_pkt(dst_addr, sizeof(hdr), (char*)&hdr, len, msg)) {
return -1;
}
return len;
}
