gvpe/src/connection.h

/*
    connection.h -- header for connection.C
    Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
 
    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_CONNECTION_H__
#define VPE_CONNECTION_H__

#include <openssl/hmac.h>

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

struct vpn;

// called after HUP etc. to (re-)initialize global data structures
void connection_init ();

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

typedef rsaclear rsachallenge;      // challenge data;
typedef rsacrypt rsaencrdata;       // encrypted challenge
typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash

////////////////////////////////////////////////////////////////////////////////////////

struct crypto_ctx;

struct hmac_packet : net_packet
{
  u8 hmac[HMACLENGTH];          // each and every packet has a hmac field, but that is not (yet) checked everywhere

  void hmac_set (crypto_ctx * ctx);
  bool hmac_chk (crypto_ctx * ctx);

private:
  static unsigned char hmac_digest[EVP_MAX_MD_SIZE];

  void hmac_gen (crypto_ctx * ctx);
};

struct vpn_packet : hmac_packet
  {
    enum ptype
    {
      PT_RESET = 0,
      PT_DATA_UNCOMPRESSED,
      PT_DATA_COMPRESSED,
      PT_PING, PT_PONG, // wasting namespace space? ;)
      PT_AUTH_REQ,      // authentification request
      PT_AUTH_RES,      // authentification response
      PT_CONNECT_REQ,   // want other host to contact me
      PT_CONNECT_INFO,  // request connection to some node
      PT_MAX
    };

    u8 type;
    u8 srcdst, src1, dst1;

    void set_hdr (ptype type_, unsigned int dst);

    unsigned int src () const
    {
      return src1 | ((srcdst >> 4) << 8);
    }

    unsigned int dst () const
    {
      return dst1 | ((srcdst & 0xf) << 8);
    }

    ptype typ () const
    {
      return (ptype) type;
    }
  };

////////////////////////////////////////////////////////////////////////////////////////

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

  public:

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

    pkt_queue ();
    ~pkt_queue ();
  };

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

    sockinfo si; // the current(!) destination ip to send packets to
    int retry_cnt;

    tstamp last_activity;       // time of last packet received

    u32 oseqno;
    sliding_window iseqno;

    u8 protocol;

    pkt_queue data_queue, vpn_queue;

    crypto_ctx *octx, *ictx;

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

    void reset_si ();
    const sockinfo &forward_si (const sockinfo &si) const;

    void shutdown ();
    void connection_established ();
    void reset_connection ();

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

    void send_connect_request (int id);
    void send_auth_request (const sockinfo &si, bool initiate);
    void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
    void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
    void send_reset (const sockinfo &dsi);
    void send_ping (const sockinfo &dsi, u8 pong = 0);
    void send_data_packet (tap_packet *pkt);

    void inject_data_packet (tap_packet *pkt, bool broadcast = false);
    void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding

    void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
    void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);

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

    void dump_status ();

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

#endif

Revision:	1.13
Committed:	Tue Jan 27 05:56:35 2004 UTC (20 years, 4 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.12:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			connection.h -- header for connection.C
3	pcg	1.12	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
4	pcg	1.1
5			This program is free software; you can redistribute it and/or modify
6			it under the terms of the GNU General Public License as published by
7			the Free Software Foundation; either version 2 of the License, or
8			(at your option) any later version.
9
10			This program is distributed in the hope that it will be useful,
11			but WITHOUT ANY WARRANTY; without even the implied warranty of
12			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13			GNU General Public License for more details.
14
15			You should have received a copy of the GNU General Public License
16			along with this program; if not, write to the Free Software
17			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18			*/
19
20			#ifndef VPE_CONNECTION_H__
21			#define VPE_CONNECTION_H__
22
23			#include <openssl/hmac.h>
24
25			#include "global.h"
26			#include "conf.h"
27			#include "sockinfo.h"
28			#include "util.h"
29			#include "device.h"
30
31			struct vpn;
32
33			// called after HUP etc. to (re-)initialize global data structures
34			void connection_init ();
35
36			struct rsaid {
37			u8 id[RSA_IDLEN]; // the challenge id
38			};
39
40	pcg	1.11	typedef rsaclear rsachallenge; // challenge data;
41			typedef rsacrypt rsaencrdata; // encrypted challenge
42	pcg	1.1	typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
43
44			////////////////////////////////////////////////////////////////////////////////////////
45
46			struct crypto_ctx;
47
48	pcg	1.13	struct hmac_packet : net_packet
49	pcg	1.1	{
50			u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere
51
52			void hmac_set (crypto_ctx * ctx);
53			bool hmac_chk (crypto_ctx * ctx);
54
55			private:
56			static unsigned char hmac_digest[EVP_MAX_MD_SIZE];
57
58			void hmac_gen (crypto_ctx * ctx);
59			};
60
61			struct vpn_packet : hmac_packet
62			{
63			enum ptype
64			{
65			PT_RESET = 0,
66			PT_DATA_UNCOMPRESSED,
67			PT_DATA_COMPRESSED,
68			PT_PING, PT_PONG, // wasting namespace space? ;)
69			PT_AUTH_REQ, // authentification request
70			PT_AUTH_RES, // authentification response
71			PT_CONNECT_REQ, // want other host to contact me
72			PT_CONNECT_INFO, // request connection to some node
73			PT_MAX
74			};
75
76			u8 type;
77			u8 srcdst, src1, dst1;
78
79	pcg	1.5	void set_hdr (ptype type_, unsigned int dst);
80	pcg	1.1
81			unsigned int src () const
82			{
83			return src1 \| ((srcdst >> 4) << 8);
84			}
85
86			unsigned int dst () const
87			{
88			return dst1 \| ((srcdst & 0xf) << 8);
89			}
90
91			ptype typ () const
92			{
93			return (ptype) type;
94			}
95			};
96
97			////////////////////////////////////////////////////////////////////////////////////////
98
99			// a very simple fifo pkt-queue
100			class pkt_queue
101			{
102	pcg	1.8	net_packet *queue[QUEUEDEPTH];
103	pcg	1.1	int i, j;
104
105			public:
106
107	pcg	1.8	void put (net_packet *p);
108			net_packet *get ();
109	pcg	1.1
110			pkt_queue ();
111			~pkt_queue ();
112			};
113
114			struct connection
115			{
116			conf_node *conf;
117			struct vpn *vpn;
118
119			sockinfo si; // the current(!) destination ip to send packets to
120			int retry_cnt;
121
122			tstamp last_activity; // time of last packet received
123
124			u32 oseqno;
125			sliding_window iseqno;
126
127			u8 protocol;
128
129	pcg	1.8	pkt_queue data_queue, vpn_queue;
130	pcg	1.1
131			crypto_ctx octx, ictx;
132
133			enum conf_node::connectmode connectmode;
134			u8 prot_minor; // minor number of other side
135
136	pcg	1.6	void reset_si ();
137			const sockinfo &forward_si (const sockinfo &si) const;
138	pcg	1.1
139			void shutdown ();
140	pcg	1.7	void connection_established ();
141	pcg	1.1	void reset_connection ();
142	pcg	1.7
143	pcg	1.4	void establish_connection_cb (time_watcher &w); time_watcher establish_connection;
144			void rekey_cb (time_watcher &w); time_watcher rekey; // next rekying (actually current reset + reestablishing)
145			void keepalive_cb (time_watcher &w); time_watcher keepalive; // next keepalive probe
146	pcg	1.1
147	pcg	1.7	void send_connect_request (int id);
148	pcg	1.1	void send_auth_request (const sockinfo &si, bool initiate);
149			void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
150			void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
151			void send_reset (const sockinfo &dsi);
152			void send_ping (const sockinfo &dsi, u8 pong = 0);
153	pcg	1.9	void send_data_packet (tap_packet *pkt);
154	pcg	1.7
155	pcg	1.1	void inject_data_packet (tap_packet *pkt, bool broadcast = false);
156	pcg	1.6	void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding
157	pcg	1.1
158	pcg	1.7	void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
159	pcg	1.1	void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
160
161			void script_node ();
162	pcg	1.3	const char *script_node_up ();
163			const char *script_node_down ();
164	pcg	1.1
165			void dump_status ();
166
167			connection(struct vpn *vpn_);
168			~connection ();
169			};
170
171			#endif
172