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24 | |
24 | |
25 | #include <openssl/evp.h> |
25 | #include <openssl/evp.h> |
26 | #include <openssl/rsa.h> |
26 | #include <openssl/rsa.h> |
27 | |
27 | |
28 | #include "conf.h" |
28 | #include "conf.h" |
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29 | #include "iom.h" |
29 | #include "util.h" |
30 | #include "util.h" |
30 | #include "device.h" |
31 | #include "device.h" |
31 | |
32 | |
32 | /* Protocol version. Different versions are incompatible, |
33 | /* Protocol version. Different versions are incompatible, |
33 | incompatible version have different protocols. |
34 | incompatible version have different protocols. |
34 | */ |
35 | */ |
35 | |
36 | |
36 | #define PROTOCOL_MAJOR 2 |
37 | #define PROTOCOL_MAJOR 3 |
37 | #define PROTOCOL_MINOR 0 |
38 | #define PROTOCOL_MINOR 0 |
38 | |
39 | |
39 | struct vpn; |
40 | struct vpn; |
40 | struct vpn_packet; |
41 | struct vpn_packet; |
41 | |
42 | |
42 | typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data |
43 | typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data |
43 | typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
44 | typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
44 | |
45 | |
45 | struct crypto_ctx; |
46 | struct crypto_ctx; |
46 | |
47 | |
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48 | // a very simple fifo pkt-queue |
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49 | class pkt_queue |
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50 | { |
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51 | tap_packet *queue[QUEUEDEPTH]; |
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52 | int i, j; |
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53 | |
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54 | public: |
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55 | |
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56 | void put (tap_packet *p); |
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57 | tap_packet *get (); |
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58 | |
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59 | pkt_queue (); |
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60 | ~pkt_queue (); |
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61 | }; |
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62 | |
47 | enum auth_subtype { AUTH_INIT, AUTH_INITREPLY, AUTH_REPLY }; |
63 | enum auth_subtype { AUTH_INIT, AUTH_INITREPLY, AUTH_REPLY }; |
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64 | |
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65 | struct auth_packet; |
48 | |
66 | |
49 | struct connection |
67 | struct connection |
50 | { |
68 | { |
51 | conf_node *conf; |
69 | conf_node *conf; |
52 | struct vpn *vpn; |
70 | struct vpn *vpn; |
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71 | u32 seqrand; |
53 | |
72 | |
54 | SOCKADDR sa; |
73 | SOCKADDR sa; |
55 | int retry_cnt; |
74 | int retry_cnt; |
56 | |
75 | |
57 | time_t next_retry; // next connection retry |
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58 | time_t next_rekey; // next rekying (actually current reset + reestablishing) |
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59 | time_t last_activity; // time of last packet received |
76 | tstamp last_activity; // time of last packet received |
60 | |
77 | |
61 | u32 oseqno; |
78 | u32 oseqno; |
62 | u32 iseqno; |
79 | sliding_window iseqno; |
63 | u32 ismask; // bitmask with set bits for each received seqno (input seen mask) |
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64 | |
80 | |
65 | pkt_queue queue; |
81 | pkt_queue queue; |
66 | |
82 | |
67 | crypto_ctx *octx, *ictx; |
83 | crypto_ctx *octx, *ictx; |
68 | |
84 | |
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70 | |
86 | |
71 | void reset_dstaddr (); |
87 | void reset_dstaddr (); |
72 | |
88 | |
73 | void shutdown (); |
89 | void shutdown (); |
74 | void reset_connection (); |
90 | void reset_connection (); |
75 | void establish_connection (); |
91 | void establish_connection_cb (tstamp &ts); time_watcher establish_connection; |
76 | void rekey (); |
92 | void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing) |
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93 | void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe |
77 | |
94 | |
78 | void send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k = 0); |
95 | void send_auth (auth_subtype subtype, SOCKADDR *sa, const rsachallenge *k = 0); |
79 | void send_reset (SOCKADDR *dsa); |
96 | void send_reset (SOCKADDR *dsa); |
80 | void send_ping (SOCKADDR *dss, u8 pong = 0); |
97 | void send_ping (SOCKADDR *dss, u8 pong = 0); |
81 | void send_data_packet (tap_packet *pkt, bool broadcast = false); |
98 | void send_data_packet (tap_packet *pkt, bool broadcast = false); |
82 | void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
99 | void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
83 | void connect_request (int id); |
100 | void connect_request (int id); |
84 | |
101 | |
85 | void recv_vpn_packet (vpn_packet *pkt, SOCKADDR *rsa); |
102 | void recv_vpn_packet (vpn_packet *pkt, SOCKADDR *rsa); |
86 | |
103 | |
87 | void timer (); |
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88 | |
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89 | connection(struct vpn *vpn_) |
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90 | : vpn(vpn_) |
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91 | { |
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92 | octx = ictx = 0; |
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93 | retry_cnt = 0; |
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94 | connectmode = conf_node::C_ALWAYS; // initial setting |
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95 | reset_connection (); |
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96 | } |
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97 | |
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98 | ~connection () |
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99 | { |
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100 | shutdown (); |
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101 | } |
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102 | |
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103 | void script_node (); |
104 | void script_node (); |
104 | const char *script_node_up (); |
105 | const char *script_node_up (); |
105 | const char *script_node_down (); |
106 | const char *script_node_down (); |
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107 | |
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108 | connection(struct vpn *vpn_); |
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109 | ~connection (); |
106 | }; |
110 | }; |
107 | |
111 | |
108 | struct vpn |
112 | struct vpn |
109 | { |
113 | { |
110 | int socket_fd; |
114 | int socket_fd; |
111 | int events; |
115 | int events; |
112 | |
116 | |
113 | tap_device *tap; |
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114 | |
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115 | enum { |
117 | enum { |
116 | EVENT_RECONNECT = 1, |
118 | EVENT_RECONNECT = 1, |
117 | EVENT_SHUTDOWN = 2, |
119 | EVENT_SHUTDOWN = 2, |
118 | }; |
120 | }; |
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121 | |
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122 | void event_cb (tstamp &ts); time_watcher event; |
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123 | |
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124 | tap_device *tap; |
119 | |
125 | |
120 | typedef vector<connection *> conns_vector; |
126 | typedef vector<connection *> conns_vector; |
121 | conns_vector conns; |
127 | conns_vector conns; |
122 | |
128 | |
123 | connection *find_router (); |
129 | connection *find_router (); |
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125 | void send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos = IPTOS_RELIABILITY); |
131 | void send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos = IPTOS_RELIABILITY); |
126 | void reconnect_all (); |
132 | void reconnect_all (); |
127 | void shutdown_all (); |
133 | void shutdown_all (); |
128 | void connect_request (int id); |
134 | void connect_request (int id); |
129 | |
135 | |
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136 | void vpn_ev (short revents); io_watcher vpn_ev_watcher; |
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137 | void udp_ev (short revents); io_watcher udp_ev_watcher; |
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138 | |
130 | vpn (); |
139 | vpn (); |
131 | ~vpn (); |
140 | ~vpn (); |
132 | |
141 | |
133 | int setup (); |
142 | int setup (); |
134 | void main_loop (); |
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135 | |
143 | |
136 | const char *script_if_up (); |
144 | const char *script_if_up (); |
137 | }; |
145 | }; |
138 | |
146 | |
139 | #endif |
147 | #endif |