/******************************************************************************
-Author: Samuel Jero
+Utility to convert a DCCP flow to a TCP flow for DCCP analysis via
+ tcptrace.
-Date: 5/2011
+Copyright (C) 2013 Samuel Jero <sj323707@ohio.edu>
-Description: Header file for program to convert a DCCP flow to a TCP flow for DCCP
- analysis via tcptrace.
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Author: Samuel Jero <sj323707@ohio.edu>
+Date: 02/2013
Notes:
- 1)Supports only a single DCCP connection per capture
- 2)Source Port!=Destination Port
- 3)DCCP MUST use 48 bit sequence numbers
- 4)Checksums are not computed (they are zeroed)
- 5)Only implements those packet types normally used in a session
- 6)DCCP Ack packets show up as TCP packets containing one byte
- 7)Very little error checking of packet headers
+ 1)DCCP MUST use 48 bit sequence numbers
+ 2)DCCP Ack packets show up as TCP packets containing one byte
******************************************************************************/
#ifndef _DCCP2TCP_H
#define _DCCP2TCP_H
#include <ctype.h>
#include <pcap.h>
#include <linux/dccp.h>
+#include "checksums.h"
#define MAX_PACKET 1600 /*Maximum size of TCP packet */
#define TBL_SZ 40000 /*Size of Sequence Number Table*/
+#define TRUE 1
+#define FALSE 0
+typedef __be16 dccp_port;
+typedef __be32 d_seq_num;
+
+/*Packet structure*/
+struct packet{
+ struct pcap_pkthdr *h; /*libpcap header*/
+ u_char *data; /*Packet Data*/
+ int length; /*Packet length*/
+ int id_len; /*Length of IDs*/
+ u_char *src_id; /*Source ID of packet*/
+ u_char *dest_id;/*Destination ID of packet*/
+};
+
+/*Constant Packet structure*/
+struct const_packet{
+ const struct pcap_pkthdr *h; /*libpcap header*/
+ const u_char *data; /*Packet Data*/
+ int length; /*Packet length*/
+ int id_len; /*Length of IDs*/
+ u_char *src_id; /*Source ID of packet*/
+ u_char *dest_id;/*Destination ID of packet*/
+};
+
+/*Connection states*/
+enum con_state{
+ INIT,
+ OPEN,
+ CLOSE,
+ DEAD,
+ IGNORE,
+};
+
+/*Connection Types (i.e. CCID)*/
+enum con_type{
+ UNKNOWN,
+ CCID2,
+ CCID3,
+};
-/*sequence number structure--one per side of the connection */
-struct seq_num{
- int cur; /*current sequence number */
- __be16 addr; /*connection half id---source port */
- struct tbl *table; /*sequence number table */
- int size; /*sequence number table size */
+/*Half Connection structure*/
+struct hcon{
+ int id_len; /*Length of ID*/
+ u_char *id; /*Host ID*/
+ dccp_port port; /*Host DCCP port*/
+ struct tbl *table; /*Host Sequence Number Table*/
+ int size; /*Size of Sequence Number Table*/
+ int cur; /*Current TCP Sequence Number*/
+ int high_ack;/*Highest ACK seen*/
+ enum con_state state; /*Connection state*/
+ enum con_type type; /*Connection type*/
+};
+
+/*Connection structure*/
+struct connection{
+ struct connection *next; /*List pointer*/
+ struct hcon A; /*Host A*/
+ struct hcon B; /*Host B*/
};
/*sequence number table structure */
struct tbl{
- __be32 old; /*DCCP sequence number */
+ d_seq_num old; /*DCCP sequence number */
u_int32_t new; /*TCP sequence number */
int size; /*packet size*/
enum dccp_pkt_type type; /*packet type*/
extern int green; /*tcptrace green line as currently acked packet*/
extern int sack; /*add TCP SACKS*/
-/*Half Connection Structures*/
-extern struct seq_num *s1; /*sequence number structure for side one of connection*/
-extern struct seq_num *s2; /*sequence number structure for side two of connection*/
-
+extern struct connection *chead;/*connection list*/
/*debug printf
* Levels:
void dbgprintf(int level, const char *fmt, ...);
/*Function to parse encapsulation*/
-int do_encap(int link, struct pcap_pkthdr *h, u_char **nptr, int *nlength, const u_char **optr, int *length);
+int do_encap(int link, struct packet *new, const struct const_packet *old);
+
+/*Connection functions*/
+int get_host(u_char *src_id, u_char* dest_id, int id_len, int src_port, int dest_port,
+ enum dccp_pkt_type pkt_type, struct hcon **fwd, struct hcon **rev);
+struct connection *add_connection(u_char *src_id, u_char* dest_id, int id_len,
+ int src_port, int dest_port);
+int update_state(struct hcon* hst, enum con_state st);
+void cleanup_connections();
+
+/*Half Connection/Sequence number functions*/
+u_int32_t initialize_hcon(struct hcon *hcn, d_seq_num initial);
+u_int32_t add_new_seq(struct hcon *hcn, d_seq_num num, int size, enum dccp_pkt_type type);
+u_int32_t convert_ack(struct hcon *hcn, d_seq_num num, struct hcon *o_hcn);
+int acked_packet_size(struct hcon *hcn, d_seq_num num);
+unsigned int interp_ack_vect(u_char* hdr);
#endif
projects / dccp2tcp / blobdiff