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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 major versions are incompatible, |
33 | incompatible version have different protocols. |
34 | * different minor versions probably are compatible ;) |
34 | */ |
35 | */ |
35 | |
36 | |
36 | #define PROTOCOL_MAJOR 2 |
37 | #define PROTOCOL_MAJOR 0 |
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 | |
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43 | struct rsaid { |
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44 | u8 id[RSA_IDLEN]; // the challenge id |
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45 | }; |
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46 | |
42 | typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data |
47 | typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
43 | typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
48 | typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
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49 | typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash |
44 | |
50 | |
45 | struct crypto_ctx; |
51 | struct crypto_ctx; |
46 | |
52 | |
47 | enum auth_subtype { AUTH_INIT, AUTH_INITREPLY, AUTH_REPLY }; |
53 | // a very simple fifo pkt-queue |
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54 | class pkt_queue |
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55 | { |
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56 | tap_packet *queue[QUEUEDEPTH]; |
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57 | int i, j; |
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58 | |
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59 | public: |
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60 | |
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61 | void put (tap_packet *p); |
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62 | tap_packet *get (); |
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63 | |
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64 | pkt_queue (); |
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65 | ~pkt_queue (); |
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66 | }; |
48 | |
67 | |
49 | struct connection |
68 | struct connection |
50 | { |
69 | { |
51 | conf_node *conf; |
70 | conf_node *conf; |
52 | struct vpn *vpn; |
71 | struct vpn *vpn; |
53 | |
72 | |
54 | SOCKADDR sa; |
73 | SOCKADDR sa; // the current(!) destination ip to send packets to |
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 | |
69 | enum conf_node::connectmode connectmode; |
85 | enum conf_node::connectmode connectmode; |
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86 | u8 prot_minor; // minor number of other side |
70 | |
87 | |
71 | void reset_dstaddr (); |
88 | void reset_dstaddr (); |
72 | |
89 | |
73 | void shutdown (); |
90 | void shutdown (); |
74 | void reset_connection (); |
91 | void reset_connection (); |
75 | void establish_connection (); |
92 | void establish_connection_cb (tstamp &ts); time_watcher establish_connection; |
76 | void rekey (); |
93 | void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing) |
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94 | void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe |
77 | |
95 | |
78 | void send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k = 0); |
96 | void send_auth_request (SOCKADDR *sa, bool initiate); |
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97 | void send_auth_response (SOCKADDR *sa, const rsaid &id, const rsachallenge &chg); |
79 | void send_reset (SOCKADDR *dsa); |
98 | void send_reset (SOCKADDR *dsa); |
80 | void send_ping (SOCKADDR *dss, u8 pong = 0); |
99 | void send_ping (SOCKADDR *dss, u8 pong = 0); |
81 | void send_data_packet (tap_packet *pkt, bool broadcast = false); |
100 | void send_data_packet (tap_packet *pkt, bool broadcast = false); |
82 | void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
101 | void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
83 | void connect_request (int id); |
102 | void connect_request (int id); |
84 | |
103 | |
85 | void recv_vpn_packet (vpn_packet *pkt, SOCKADDR *rsa); |
104 | void recv_vpn_packet (vpn_packet *pkt, SOCKADDR *rsa); |
86 | |
105 | |
87 | void timer (); |
106 | void script_node (); |
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107 | const char *script_node_up (int); |
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108 | const char *script_node_down (int); |
88 | |
109 | |
89 | connection(struct vpn *vpn_) |
110 | connection(struct vpn *vpn_); |
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 () |
111 | ~connection (); |
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 (); |
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104 | const char *script_node_up (); |
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105 | const char *script_node_down (); |
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106 | }; |
112 | }; |
107 | |
113 | |
108 | struct vpn |
114 | struct vpn |
109 | { |
115 | { |
110 | int socket_fd; |
116 | int socket_fd; |
111 | int events; |
117 | int events; |
112 | |
118 | |
113 | tap_device *tap; |
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114 | |
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115 | enum { |
119 | enum { |
116 | EVENT_RECONNECT = 1, |
120 | EVENT_RECONNECT = 1, |
117 | EVENT_SHUTDOWN = 2, |
121 | EVENT_SHUTDOWN = 2, |
118 | }; |
122 | }; |
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123 | |
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124 | void event_cb (tstamp &ts); time_watcher event; |
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125 | |
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126 | tap_device *tap; |
119 | |
127 | |
120 | typedef vector<connection *> conns_vector; |
128 | typedef vector<connection *> conns_vector; |
121 | conns_vector conns; |
129 | conns_vector conns; |
122 | |
130 | |
123 | connection *find_router (); |
131 | connection *find_router (); |
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125 | void send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos = IPTOS_RELIABILITY); |
133 | void send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos = IPTOS_RELIABILITY); |
126 | void reconnect_all (); |
134 | void reconnect_all (); |
127 | void shutdown_all (); |
135 | void shutdown_all (); |
128 | void connect_request (int id); |
136 | void connect_request (int id); |
129 | |
137 | |
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138 | void vpn_ev (short revents); io_watcher vpn_ev_watcher; |
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139 | void udp_ev (short revents); io_watcher udp_ev_watcher; |
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140 | |
130 | vpn (); |
141 | vpn (); |
131 | ~vpn (); |
142 | ~vpn (); |
132 | |
143 | |
133 | int setup (); |
144 | int setup (); |
134 | void main_loop (); |
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135 | |
145 | |
136 | const char *script_if_up (); |
146 | const char *script_if_up (int); |
137 | }; |
147 | }; |
138 | |
148 | |
139 | #endif |
149 | #endif |
140 | |
150 | |