Checksum computation!

[dccp2tcp] / dccp2tcp.h

diff --git a/dccp2tcp.h b/dccp2tcp.h
index 64c8dd29ba09067c5105c54cd0da75c9d9d2b3fc..e3b373ccc1d369c46935b8c935bcb0307fe7c564 100644 (file)
--- a/dccp2tcp.h
+++ b/dccp2tcp.h
@@ -1,18 +1,30 @@
 /******************************************************************************
-Author: Samuel Jero
+Utility to convert a DCCP flow to a TCP flow for DCCP analysis via
+               tcptrace.
 
-Date: 7/2011
+Copyright (C) 2012  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: 11/2012
 
 Notes:
        1)CCID2 ONLY
        2)DCCP MUST use 48 bit sequence numbers
-       3)Checksums are not computed (they are zeroed)
-       4)Only implements those packet types normally used in a session
-       5)DCCP Ack packets show up as TCP packets containing one byte
-       6)Very little error checking of packet headers
+       3)DCCP DATA packets are not implemented (Linux doesn't use them)
+       4)DCCP Ack packets show up as TCP packets containing one byte
 ******************************************************************************/
 #ifndef _DCCP2TCP_H
 #define _DCCP2TCP_H
@@ -40,6 +52,7 @@ Notes:
 #include <ctype.h>
 #include <pcap.h>
 #include <linux/dccp.h>
+#include "checksums.h"
 
 
 #define MAX_PACKET     1600    /*Maximum size of TCP packet */
@@ -53,8 +66,9 @@ struct packet{
        struct pcap_pkthdr      *h;             /*libpcap header*/
        u_char                          *data;  /*Packet Data*/
        int                                     length; /*Packet length*/
-       uint32_t                        src_id; /*Source ID of packet*/
-       uint32_t                        dest_id; /*Destination ID of packet*/
+       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*/
@@ -62,8 +76,9 @@ struct const_packet{
        const struct pcap_pkthdr *h;    /*libpcap header*/
        const u_char                    *data;  /*Packet Data*/
        int                                             length; /*Packet length*/
-       uint32_t                                src_id; /*Source ID of packet*/
-       uint32_t                                dest_id;/*Destination ID of packet*/
+       int                                             id_len; /*Length of IDs*/
+       u_char                                  *src_id; /*Source ID of packet*/
+       u_char                                  *dest_id;/*Destination ID of packet*/
 };
 
 /*Connection states*/
@@ -73,14 +88,23 @@ enum con_state{
        CLOSE,
 };
 
+/*Connection Types (i.e. CCID)*/
+enum con_type{
+       UNKNOWN,
+       CCID2,
+       CCID3,
+};
+
 /*Host---half of a connection*/
 struct host{
-       uint32_t                        id;             /*Host ID*/
+       int                                     id_len; /*Length of ID*/
+       u_char                          *id;    /*Host ID*/
        __be16                          port;   /*Host DCCP port*/
        struct tbl                      *table; /*Host Sequence Number Table*/
        int                                     size;   /*Size of Sequence Number Table*/
        int                                     cur;    /*Current TCP Sequence Number*/
        enum con_state          state;  /*Connection state*/
+       enum con_type           type;   /*Connection type*/
 };
 
 /*Connection structure*/
@@ -106,7 +130,6 @@ extern int sack;            /*add TCP SACKS*/
 
 extern struct connection *chead;/*connection list*/
 
-
 /*debug printf
  * Levels:
  *     0) Always print even if debug isn't specified
@@ -119,9 +142,14 @@ void dbgprintf(int level, const char *fmt, ...);
 int do_encap(int link, struct packet *new, const struct const_packet *old);
 
 /*Connection functions*/
-int get_host(uint32_t src_id, uint32_t dest_id, int src_port, int dest_port, struct host **fwd, struct host **rev);
-struct connection *add_connection(uint32_t src_id, uint32_t dest_id, int src_port, int dest_port);
+int get_host(u_char *src_id, u_char* dest_id, int id_len, int src_port, int dest_port,
+               struct host **fwd, struct host **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 host* hst, enum con_state st);
 void cleanup_connections();
 
+/*Per-CCID convert functions*/
+int ccid2_convert_packet(struct packet *new, const struct const_packet* old);
+
 #endif