netio.c File Reference

provides functions to read and write to sockets specific to the messages that should be sent for the communication protocol. More...

#include "netio.h"
#include "netio_private.h"
#include "berkeleyapi.h"
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
#include "debug.h"

Go to the source code of this file.

Functions
errorcode	readMsg (sock_t sd, comm_type_t type, void *buf, int buf_len)
	reads up to buf_len bytes into buf
errorcode	checkMsgLen (char *msg, int msg_len)
	checks that an message is as long as the length field says it is
errorcode	sendMsg (sock_t sd, long type, void *payload, long payload_len)
	creates a message from the type and payload and sents it

---

Detailed Description

provides functions to read and write to sockets specific to the messages that should be sent for the communication protocol.

Author:

Daniel Ferullo (ferullo@cmu.edu)

Definition in file netio.c.

---

Function Documentation

errorcode checkMsgLen (  char *  msg, int  msg_len )

checks that an message is as long as the length field says it is Parameters: msg  a pointer to the message msg_len  the length of msg (including header) Returns: OK if the message is ok, NOT_OK if it is to small, other neg value otherwise Definition at line 125 of file netio.c. References CHECK_NOT_NEG, COMM_LENGTH_LEN, COMM_TYPE_LEN, ERROR_NEG_ARG_2, ERROR_NULL_ARG_1, and errorcode. Referenced by readMsg().

errorcode readMsg (  sock_t  sd, comm_type_t  type, void *  buf, int  buf_len )

reads up to buf_len bytes into buf This function checks that as it read messages the length field of the header is correct THIS FUNCTION CONTAINS A COMPLICATED WHILE LOOP THAT IS WORTH A SECOND LOOK! Parameters: sd  the socket to read from type  the message type to read buf  the buffer to store the message in (the payload only) buf_len  the length of the buffer Returns: SUCCESS, errorcode on failure Definition at line 35 of file netio.c. References CHECK_NOT_NEG, checkMsgLen(), COMM_HEADER_LEN, comm_type_t, DBG_ALL, DEBUG, ERROR_NEG_ARG_1, ERROR_NEG_ARG_4, errorcode, and safe_free(). Referenced by helper_fsm_buddy_alloc(), helper_fsm_buddy_port(), helper_fsm_conn2(), helper_fsm_end_buddy_bday(), helper_fsm_end_peer_bday(), helper_fsm_goodbye(), helper_fsm_hello(), helper_fsm_start_buddy_bday(), helper_fsm_start_direct_conn(), helper_fsm_start_peer_bday(), peer_fsm_bday_synack_flood(), peer_fsm_buddy_alloc(), peer_fsm_buddy_port(), peer_fsm_check_port_pred(), peer_fsm_conn_again(), peer_fsm_end_bday(), and peer_fsm_forge_syn_ack().

errorcode sendMsg (  sock_t  sd, long  type, void *  payload, long  payload_len )

creates a message from the type and payload and sents it Parameters: sd  the socket to send on type  the message type payload  a pointer to the payload (can be NULL if payload == 0) payload_len  the length of the payload in bytes Returns: SUCCESS, neg on failure Definition at line 152 of file netio.c. References CHECK_NOT_NEG, COMM_HEADER_LEN, COMM_LENGTH_LEN, COMM_TYPE_LEN, DBG_NETWORK, DEBUG, ERROR_NEG_ARG_1, ERROR_NEG_ARG_4, errorcode, and safe_free(). Referenced by helper_fsm_buddy_alloc(), helper_fsm_buddy_port(), helper_fsm_conn2(), helper_fsm_end_buddy_bday(), helper_fsm_end_peer_bday(), helper_fsm_hello(), helper_fsm_start_buddy_bday(), helper_fsm_start_direct_conn(), helper_fsm_start_peer_bday(), peer_fsm_bday_synack_flood(), peer_fsm_buddy_alloc(), peer_fsm_check_port_pred(), peer_fsm_conn_again(), peer_fsm_end_bday(), peer_fsm_forge_syn_ack(), peer_fsm_hello(), peer_fsm_reply_bday(), peer_fsm_start_bday(), and peer_fsm_start_direct_conn().

---