vde-2/vde_cryptcab/blowfish.h

   1 /*
   2  * Blowfish headers
   3  * Copyright © 2006 Daniele Lacamera
   4  * Released under the terms of GNU GPL v.2
   5  * http://www.gnu.org/copyleft/gpl.html
   6  *
   7  * This program is released under the GPL with the additional exemption that
   8  * compiling, linking, and/or using OpenSSL is allowed.
   9  */
  10
  11 #ifndef __BLOWFISH_H
  12 #define __BLOWFISH_H
  13
  14
  15 #include <openssl/blowfish.h>
  16 #include <openssl/evp.h>
  17 #include <sys/stat.h>
  18 #include <sys/types.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/time.h>
  21 #include <sys/stat.h>
  22 #include <sys/socket.h>
  23 #include <net/if.h>
  24 #include <netinet/in.h>
  25 #include <arpa/inet.h>
  26 #include <fcntl.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <errno.h>
  32 #include <time.h>
  33 #include <libvdeplug/libvdeplug.h>
  34
  35 #define IP_SIZE 1024
  36 #define OP_SIZE 1032
  37 #define MAXPKT 2000
  38 #define FILENAMESIZE 16
  39
  40 #ifdef XOR
  41   #undef XOR
  42 #endif
  43 #define XOR(a,b) a==b?0:1
  44
  45 #define before_time(a,b) a.tv_sec==b.tv_sec?a.tv_usec<b.tv_usec:a.tv_sec<b.tv_sec
  46
  47 #ifdef MIN
  48   #undef MIN
  49 #endif
  50 #define MIN(a,b) a<b?a:b
  51
  52 #define SRC_VDE 0
  53 #define SRC_BF  1
  54 #define SRC_CTL 2
  55
  56 #define PKT_DATA 0x20
  57 #define PKT_CTL  0x40
  58
  59 #define CMD_LOGIN 0x41
  60 #define CMD_CHALLENGE 0x42
  61 #define CMD_RESPONSE 0x44
  62 #define CMD_AUTH_OK 0x48
  63 #define CMD_DENY 0x4A
  64 #define CMD_HANDOVER 0x4C
  65 #define CMD_IDENTIFY 0x4E
  66
  67 #define ST_CLOSED 0
  68 #define ST_OPENING 1
  69 #define ST_CHALLENGE 2
  70 #define ST_AUTH 3
  71 #define ST_SERVER 4
  72 #define ST_WAIT_AUTH 5
  73 #define ST_IDSENT 6
  74
  75 #define SESSION_TIMEOUT 120
  76 #define time_now(x) gettimeofday(x,NULL)
  77
  78
  79 /*
  80  * This struct contains the other endpoint's informations.
  81  */
  82 struct peer
  83 {
  84         struct peer *next;              /* Next list element            */
  85         unsigned long long counter;     /* Progressive N number         */
  86         unsigned char key[16];          /* Blowfish key                 */
  87         unsigned char iv[8];            /* Blowfish vector              */
  88         char id[FILENAMESIZE];          /* Filename for key on server   */
  89         char challenge[128];            /* 128B Challenge for 4WHS      */
  90         struct sockaddr_in in_a;        /* Current transport address    */
  91         struct sockaddr_in handover_a;  /* Handover transport address   */
  92         struct timeval expire;          /* Expiration timer             */
  93         unsigned char state;            /* Connection state             */
  94         VDECONN *plug;                  /* Vde connection channel       */
  95
  96 };
  97 #define ip_address(X) X->in_a.sin_addr.s_addr
  98 #define after(a,b) (a.tv_sec == b.tv_sec ) ? (a.tv_usec > b.tv_usec) : (a.tv_sec > b.tv_sec)
  99
 100
 101 /*
 102  * Each datagram received from network or from vde_plug
 103  * is arranged into a struct like this.
 104  */
 105 struct datagram
 106 {
 107         unsigned char data[MAXPKT];
 108         int len;
 109         int src;
 110         struct peer *orig;
 111 };
 112
 113
 114
 115 struct peer
 116 *getpeer(struct sockaddr_in address);
 117
 118 void
 119 addpeer(struct peer *np);
 120
 121 void
 122 removepeer(struct peer *np);
 123
 124 struct peer
 125 *generate_key (struct peer*, char*);
 126
 127 void
 128 blowfish_init(int);
 129
 130 struct datagram
 131 *blowfish_select(int timeout);
 132
 133 void
 134 blowfish_login(struct peer *p);
 135
 136 void
 137 send_udp(unsigned char *data, size_t len, struct peer *p, unsigned char flags );
 138
 139 void
 140 send_vde( const char *data, size_t len, struct peer *p);
 141
 142 void
 143 autocleaner(int signo);
 144
 145 void
 146 deny_access(struct peer *p);
 147
 148 void
 149 rcv_login(struct datagram *pkt, struct peer *p, char *);
 150
 151 struct peer
 152 *getpeerbynewaddr(struct sockaddr_in saddr);
 153
 154 void
 155 rcv_response(struct datagram *pkt, struct peer *p, void (*callback)(struct peer*));
 156
 157 void
 158 rcv_challenge(struct datagram *pkt, struct peer *p);
 159
 160 struct peer
 161 *getpeerbyid(struct datagram *pkt);
 162
 163 void
 164 vde_plug(struct peer *);
 165
 166 #endif