sjero.net Git - dccp2tcp/blob - dccp2tcp.h

   1 /******************************************************************************
   2 Utility to convert a DCCP flow to a TCP flow for DCCP analysis via
   3                 tcptrace.
   4
   5 Copyright (C) 2012  Samuel Jero <sj323707@ohio.edu>
   6
   7 This program is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 Author: Samuel Jero <sj323707@ohio.edu>
  21 Date: 11/2012
  22
  23 Notes:
  24         1)CCID2 ONLY
  25         2)DCCP MUST use 48 bit sequence numbers
  26         3)Checksums are not computed (they are zeroed)
  27         4)DCCP DATA packets are not implemented (Linux doesn't use them)
  28         5)DCCP Ack packets show up as TCP packets containing one byte
  29 ******************************************************************************/
  30 #ifndef _DCCP2TCP_H
  31 #define _DCCP2TCP_H
  32
  33 #include <stdarg.h>
  34 #include <stdlib.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <strings.h>
  38 #include <sys/types.h>
  39 #include <unistd.h>
  40 #include <time.h>
  41 #include <sys/time.h>
  42 #include <sys/socket.h>
  43 #include <net/if.h>
  44 #include <netinet/in.h>
  45 #include <netinet/in_systm.h>
  46 #include <arpa/inet.h>
  47 #include <netinet/if_ether.h>
  48 #include <netinet/ip.h>
  49 #include <netinet/tcp.h>
  50 #include <netinet/tcp.h>
  51 #include <netinet/udp.h>
  52 #include <netdb.h>
  53 #include <ctype.h>
  54 #include <pcap.h>
  55 #include <linux/dccp.h>
  56
  57
  58 #define MAX_PACKET      1600    /*Maximum size of TCP packet */
  59 #define TBL_SZ          40000   /*Size of Sequence Number Table*/
  60
  61
  62
  63
  64 /*Packet structure*/
  65 struct packet{
  66         struct pcap_pkthdr      *h;             /*libpcap header*/
  67         u_char                          *data;  /*Packet Data*/
  68         int                                     length; /*Packet length*/
  69         int                                     id_len; /*Length of IDs*/
  70         u_char                          *src_id; /*Source ID of packet*/
  71         u_char                          *dest_id;/*Destination ID of packet*/
  72 };
  73
  74 /*Constant Packet structure*/
  75 struct const_packet{
  76         const struct pcap_pkthdr *h;    /*libpcap header*/
  77         const u_char                    *data;  /*Packet Data*/
  78         int                                             length; /*Packet length*/
  79         int                                             id_len; /*Length of IDs*/
  80         u_char                                  *src_id; /*Source ID of packet*/
  81         u_char                                  *dest_id;/*Destination ID of packet*/
  82 };
  83
  84 /*Connection states*/
  85 enum con_state{
  86         INIT,
  87         OPEN,
  88         CLOSE,
  89 };
  90
  91 /*Host---half of a connection*/
  92 struct host{
  93         int                                     id_len; /*Length of ID*/
  94         u_char                          *id;    /*Host ID*/
  95         __be16                          port;   /*Host DCCP port*/
  96         struct tbl                      *table; /*Host Sequence Number Table*/
  97         int                                     size;   /*Size of Sequence Number Table*/
  98         int                                     cur;    /*Current TCP Sequence Number*/
  99         enum con_state          state;  /*Connection state*/
 100 };
 101
 102 /*Connection structure*/
 103 struct connection{
 104         struct connection       *next;  /*List pointer*/
 105         struct host                     A;              /*Host A*/
 106         struct host                     B;              /*Host B*/
 107 };
 108
 109 /*sequence number table structure */
 110 struct tbl{
 111         __be32                          old;    /*DCCP sequence number */
 112         u_int32_t                       new;    /*TCP sequence number */
 113         int                                     size;   /*packet size*/
 114         enum dccp_pkt_type      type;   /*packet type*/
 115 };
 116
 117 /*Option flags*/
 118 extern int debug;               /*set to 1 to turn on debugging information*/
 119 extern int yellow;              /*tcptrace yellow line as currently acked packet*/
 120 extern int green;               /*tcptrace green line as currently acked packet*/
 121 extern int sack;                /*add TCP SACKS*/
 122
 123 extern struct connection *chead;/*connection list*/
 124
 125
 126 /*debug printf
 127  * Levels:
 128  *      0) Always print even if debug isn't specified
 129  *  1) Errors and warnings... Don't overload the screen with too much output
 130  *  2) Notes and per-packet processing info... as verbose as needed
 131  */
 132 void dbgprintf(int level, const char *fmt, ...);
 133
 134 /*Function to parse encapsulation*/
 135 int do_encap(int link, struct packet *new, const struct const_packet *old);
 136
 137 /*Connection functions*/
 138 int get_host(u_char *src_id, u_char* dest_id, int id_len, int src_port, int dest_port,
 139                 struct host **fwd, struct host **rev);
 140 struct connection *add_connection(u_char *src_id, u_char* dest_id, int id_len,
 141                 int src_port, int dest_port);
 142 int update_state(struct host* hst, enum con_state st);
 143 void cleanup_connections();
 144
 145 #endif