gvpe/src/protocol.h

/*
    protocol.h -- header for protocol.C
 
    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 2 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, write to the Free Software
    Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef VPE_PROTOCOL_H__
#define VPE_PROTOCOL_H__

#include <netinet/in.h>
#include <netinet/ip.h> // for tos etc.

#include <openssl/evp.h>
#include <openssl/rsa.h>

#include "conf.h"
#include "util.h"
#include "device.h"

/* Protocol version. Different versions are incompatible,
   incompatible version have different protocols.
 */

#define PROTOCOL_MAJOR 2
#define PROTOCOL_MINOR 0

struct vpn;
struct vpn_packet;

typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data
typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge

struct crypto_ctx;

enum auth_subtype { AUTH_INIT, AUTH_INITREPLY, AUTH_REPLY };

struct connection
  {
    conf_node *conf;
    struct vpn *vpn;

    SOCKADDR sa;
    int retry_cnt;

    time_t next_retry;          // next connection retry
    time_t next_rekey;          // next rekying (actually current reset + reestablishing)
    time_t last_activity;       // time of last packet received

    u32 oseqno;
    u32 iseqno;
    u32 ismask; // bitmask with set bits for each received seqno (input seen mask)

    pkt_queue queue;

    crypto_ctx *octx, *ictx;

    enum conf_node::connectmode connectmode;

    void reset_dstaddr ();

    void shutdown ();
    void reset_connection ();
    void establish_connection ();
    void rekey ();

    void send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k = 0);
    void send_reset (SOCKADDR *dsa);
    void send_ping (SOCKADDR *dss, u8 pong = 0);
    void send_data_packet (tap_packet *pkt, bool broadcast = false);
    void inject_data_packet (tap_packet *pkt, bool broadcast = false);
    void connect_request (int id);

    void recv_vpn_packet (vpn_packet *pkt, SOCKADDR *rsa);

    void timer ();

    connection(struct vpn *vpn_)
        : vpn(vpn_)
    {
      octx = ictx = 0;
      retry_cnt = 0;
      connectmode = conf_node::C_ALWAYS; // initial setting
      reset_connection ();
    }

    ~connection ()
    {
      shutdown ();
    }

    void script_node ();
    const char *script_node_up ();
    const char *script_node_down ();
  };

struct vpn
  {
    int socket_fd;
    int events;

    tap_device *tap;

    enum {
      EVENT_RECONNECT = 1,
      EVENT_SHUTDOWN  = 2,
    };

    typedef vector<connection *> conns_vector;
    conns_vector conns;

    connection *find_router ();

    void send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos = IPTOS_RELIABILITY);
    void reconnect_all ();
    void shutdown_all ();
    void connect_request (int id);

    vpn ();
    ~vpn ();

    int setup ();
    void main_loop ();

    const char *script_if_up ();
  };

#endif

Revision:	1.3
Committed:	Sun Mar 9 12:40:18 2003 UTC (21 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.2:	+2 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			protocol.h -- header for protocol.C
3
4			This program is free software; you can redistribute it and/or modify
5			it under the terms of the GNU General Public License as published by
6			the Free Software Foundation; either version 2 of the License, or
7			(at your option) any later version.
8
9			This program is distributed in the hope that it will be useful,
10			but WITHOUT ANY WARRANTY; without even the implied warranty of
11			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12			GNU General Public License for more details.
13
14			You should have received a copy of the GNU General Public License
15			along with this program; if not, write to the Free Software
16			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17			*/
18
19			#ifndef VPE_PROTOCOL_H__
20			#define VPE_PROTOCOL_H__
21
22			#include <netinet/in.h>
23	pcg	1.3	#include <netinet/ip.h> // for tos etc.
24	pcg	1.1
25			#include <openssl/evp.h>
26			#include <openssl/rsa.h>
27
28			#include "conf.h"
29			#include "util.h"
30			#include "device.h"
31
32			/* Protocol version. Different versions are incompatible,
33			incompatible version have different protocols.
34			*/
35
36			#define PROTOCOL_MAJOR 2
37			#define PROTOCOL_MINOR 0
38
39			struct vpn;
40			struct vpn_packet;
41
42			typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data
43			typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge
44
45			struct crypto_ctx;
46
47			enum auth_subtype { AUTH_INIT, AUTH_INITREPLY, AUTH_REPLY };
48
49			struct connection
50			{
51			conf_node *conf;
52			struct vpn *vpn;
53
54			SOCKADDR sa;
55			int retry_cnt;
56
57			time_t next_retry; // next connection retry
58			time_t next_rekey; // next rekying (actually current reset + reestablishing)
59			time_t last_activity; // time of last packet received
60
61			u32 oseqno;
62			u32 iseqno;
63			u32 ismask; // bitmask with set bits for each received seqno (input seen mask)
64
65			pkt_queue queue;
66
67			crypto_ctx octx, ictx;
68
69	pcg	1.2	enum conf_node::connectmode connectmode;
70
71	pcg	1.1	void reset_dstaddr ();
72
73			void shutdown ();
74			void reset_connection ();
75			void establish_connection ();
76			void rekey ();
77
78			void send_auth (auth_subtype subtype, SOCKADDR sa, rsachallenge k = 0);
79			void send_reset (SOCKADDR *dsa);
80			void send_ping (SOCKADDR *dss, u8 pong = 0);
81			void send_data_packet (tap_packet *pkt, bool broadcast = false);
82			void inject_data_packet (tap_packet *pkt, bool broadcast = false);
83			void connect_request (int id);
84
85			void recv_vpn_packet (vpn_packet pkt, SOCKADDR rsa);
86
87			void timer ();
88
89			connection(struct vpn *vpn_)
90			: vpn(vpn_)
91			{
92			octx = ictx = 0;
93			retry_cnt = 0;
94	pcg	1.2	connectmode = conf_node::C_ALWAYS; // initial setting
95	pcg	1.1	reset_connection ();
96			}
97
98			~connection ()
99			{
100			shutdown ();
101			}
102
103			void script_node ();
104			const char *script_node_up ();
105			const char *script_node_down ();
106			};
107
108			struct vpn
109			{
110			int socket_fd;
111			int events;
112
113			tap_device *tap;
114
115			enum {
116			EVENT_RECONNECT = 1,
117			EVENT_SHUTDOWN = 2,
118			};
119
120			typedef vector<connection *> conns_vector;
121			conns_vector conns;
122
123			connection *find_router ();
124
125	pcg	1.3	void send_vpn_packet (vpn_packet pkt, SOCKADDR sa, int tos = IPTOS_RELIABILITY);
126	pcg	1.1	void reconnect_all ();
127			void shutdown_all ();
128			void connect_request (int id);
129
130			vpn ();
131			~vpn ();
132
133			int setup ();
134			void main_loop ();
135
136			const char *script_if_up ();
137			};
138
139			#endif
140