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 "iom.h"
#include "util.h"
#include "device.h"

/* Protocol version. Different major versions are incompatible,
 * different minor versions probably are compatible ;)
 */

#define PROTOCOL_MAJOR 0
#define PROTOCOL_MINOR 0

struct vpn;
struct vpn_packet;

struct rsaid {
  u8 id[RSA_IDLEN]; // the challenge id
};

typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data;
typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge
typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash

struct crypto_ctx;

// a very simple fifo pkt-queue
class pkt_queue
  {
    tap_packet *queue[QUEUEDEPTH];
    int i, j;

  public:

    void put (tap_packet *p);
    tap_packet *get ();

    pkt_queue ();
    ~pkt_queue ();
  };

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

    SOCKADDR sa; // the current(!) destination ip to send packets to
    int retry_cnt;

    tstamp last_activity;       // time of last packet received

    u32 oseqno;
    sliding_window iseqno;

    pkt_queue queue;

    crypto_ctx *octx, *ictx;

    enum conf_node::connectmode connectmode;
    u8 prot_minor; // minor number of other side

    void reset_dstaddr ();

    void shutdown ();
    void reset_connection ();
    void establish_connection_cb (tstamp &ts); time_watcher establish_connection;
    void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing)
    void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe

    void send_auth_request (SOCKADDR *sa, bool initiate);
    void send_auth_response (SOCKADDR *sa, const rsaid &id, const rsachallenge &chg);
    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 script_node ();
    const char *script_node_up (int);
    const char *script_node_down (int);

    connection(struct vpn *vpn_);
    ~connection ();
  };

struct vpn
  {
    int socket_fd;
    int events;

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

    void event_cb (tstamp &ts); time_watcher event;

    tap_device *tap;

    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);

    void vpn_ev (short revents); io_watcher vpn_ev_watcher;
    void udp_ev (short revents); io_watcher udp_ev_watcher;

    vpn ();
    ~vpn ();

    int setup ();

    const char *script_if_up (int);
  };

#endif

Revision:	1.9
Committed:	Wed Mar 26 14:39:52 2003 UTC (21 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+5 -4 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	pcg	1.5	#include "iom.h"
30	pcg	1.1	#include "util.h"
31			#include "device.h"
32
33	pcg	1.9	/* Protocol version. Different major versions are incompatible,
34			* different minor versions probably are compatible ;)
35	pcg	1.1	*/
36
37	pcg	1.9	#define PROTOCOL_MAJOR 0
38	pcg	1.1	#define PROTOCOL_MINOR 0
39
40			struct vpn;
41			struct vpn_packet;
42
43	pcg	1.8	struct rsaid {
44			u8 id[RSA_IDLEN]; // the challenge id
45			};
46
47			typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data;
48	pcg	1.1	typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge
49	pcg	1.9	typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
50	pcg	1.1
51			struct crypto_ctx;
52
53	pcg	1.5	// a very simple fifo pkt-queue
54			class pkt_queue
55			{
56			tap_packet *queue[QUEUEDEPTH];
57			int i, j;
58
59			public:
60
61			void put (tap_packet *p);
62			tap_packet *get ();
63
64			pkt_queue ();
65			~pkt_queue ();
66			};
67
68	pcg	1.1	struct connection
69			{
70			conf_node *conf;
71			struct vpn *vpn;
72
73	pcg	1.8	SOCKADDR sa; // the current(!) destination ip to send packets to
74	pcg	1.1	int retry_cnt;
75
76	pcg	1.5	tstamp last_activity; // time of last packet received
77	pcg	1.1
78			u32 oseqno;
79	pcg	1.4	sliding_window iseqno;
80	pcg	1.1
81			pkt_queue queue;
82
83			crypto_ctx octx, ictx;
84
85	pcg	1.2	enum conf_node::connectmode connectmode;
86	pcg	1.9	u8 prot_minor; // minor number of other side
87	pcg	1.2
88	pcg	1.1	void reset_dstaddr ();
89
90			void shutdown ();
91			void reset_connection ();
92	pcg	1.5	void establish_connection_cb (tstamp &ts); time_watcher establish_connection;
93			void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing)
94			void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe
95	pcg	1.1
96	pcg	1.8	void send_auth_request (SOCKADDR *sa, bool initiate);
97			void send_auth_response (SOCKADDR *sa, const rsaid &id, const rsachallenge &chg);
98	pcg	1.1	void send_reset (SOCKADDR *dsa);
99			void send_ping (SOCKADDR *dss, u8 pong = 0);
100			void send_data_packet (tap_packet *pkt, bool broadcast = false);
101			void inject_data_packet (tap_packet *pkt, bool broadcast = false);
102			void connect_request (int id);
103
104			void recv_vpn_packet (vpn_packet pkt, SOCKADDR rsa);
105
106			void script_node ();
107	pcg	1.8	const char *script_node_up (int);
108			const char *script_node_down (int);
109	pcg	1.5
110			connection(struct vpn *vpn_);
111			~connection ();
112	pcg	1.1	};
113
114			struct vpn
115			{
116			int socket_fd;
117			int events;
118
119			enum {
120			EVENT_RECONNECT = 1,
121			EVENT_SHUTDOWN = 2,
122			};
123
124	pcg	1.5	void event_cb (tstamp &ts); time_watcher event;
125
126			tap_device *tap;
127
128	pcg	1.1	typedef vector<connection *> conns_vector;
129			conns_vector conns;
130
131			connection *find_router ();
132
133	pcg	1.3	void send_vpn_packet (vpn_packet pkt, SOCKADDR sa, int tos = IPTOS_RELIABILITY);
134	pcg	1.1	void reconnect_all ();
135			void shutdown_all ();
136			void connect_request (int id);
137
138	pcg	1.5	void vpn_ev (short revents); io_watcher vpn_ev_watcher;
139			void udp_ev (short revents); io_watcher udp_ev_watcher;
140
141	pcg	1.1	vpn ();
142			~vpn ();
143
144			int setup ();
145
146	pcg	1.8	const char *script_if_up (int);
147	pcg	1.1	};
148
149			#endif
150