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 |
#include <netinet/ip.h> // for tos etc. |
24 |
|
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 |
sliding_window iseqno; |
63 |
|
64 |
pkt_queue queue; |
65 |
|
66 |
crypto_ctx *octx, *ictx; |
67 |
|
68 |
enum conf_node::connectmode connectmode; |
69 |
|
70 |
void reset_dstaddr (); |
71 |
|
72 |
void shutdown (); |
73 |
void reset_connection (); |
74 |
void establish_connection (); |
75 |
void rekey (); |
76 |
|
77 |
void send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k = 0); |
78 |
void send_reset (SOCKADDR *dsa); |
79 |
void send_ping (SOCKADDR *dss, u8 pong = 0); |
80 |
void send_data_packet (tap_packet *pkt, bool broadcast = false); |
81 |
void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
82 |
void connect_request (int id); |
83 |
|
84 |
void recv_vpn_packet (vpn_packet *pkt, SOCKADDR *rsa); |
85 |
|
86 |
void timer (); |
87 |
|
88 |
connection(struct vpn *vpn_) |
89 |
: vpn(vpn_) |
90 |
{ |
91 |
octx = ictx = 0; |
92 |
retry_cnt = 0; |
93 |
connectmode = conf_node::C_ALWAYS; // initial setting |
94 |
reset_connection (); |
95 |
} |
96 |
|
97 |
~connection () |
98 |
{ |
99 |
shutdown (); |
100 |
} |
101 |
|
102 |
void script_node (); |
103 |
const char *script_node_up (); |
104 |
const char *script_node_down (); |
105 |
}; |
106 |
|
107 |
struct vpn |
108 |
{ |
109 |
int socket_fd; |
110 |
int events; |
111 |
|
112 |
tap_device *tap; |
113 |
|
114 |
enum { |
115 |
EVENT_RECONNECT = 1, |
116 |
EVENT_SHUTDOWN = 2, |
117 |
}; |
118 |
|
119 |
typedef vector<connection *> conns_vector; |
120 |
conns_vector conns; |
121 |
|
122 |
connection *find_router (); |
123 |
|
124 |
void send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos = IPTOS_RELIABILITY); |
125 |
void reconnect_all (); |
126 |
void shutdown_all (); |
127 |
void connect_request (int id); |
128 |
|
129 |
vpn (); |
130 |
~vpn (); |
131 |
|
132 |
int setup (); |
133 |
void main_loop (); |
134 |
|
135 |
const char *script_if_up (); |
136 |
}; |
137 |
|
138 |
#endif |
139 |
|