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pcg |
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/* |
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protocol.h -- header for protocol.C |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#ifndef VPE_PROTOCOL_H__ |
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#define VPE_PROTOCOL_H__ |
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#include <netinet/in.h> |
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#include <openssl/evp.h> |
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#include <openssl/rsa.h> |
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#include "conf.h" |
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#include "util.h" |
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#include "device.h" |
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/* Protocol version. Different versions are incompatible, |
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incompatible version have different protocols. |
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*/ |
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#define PROTOCOL_MAJOR 2 |
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#define PROTOCOL_MINOR 0 |
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struct vpn; |
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struct vpn_packet; |
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typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data |
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typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
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struct crypto_ctx; |
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enum auth_subtype { AUTH_INIT, AUTH_INITREPLY, AUTH_REPLY }; |
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struct connection |
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{ |
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conf_node *conf; |
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struct vpn *vpn; |
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SOCKADDR sa; |
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int retry_cnt; |
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time_t next_retry; // next connection retry |
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time_t next_rekey; // next rekying (actually current reset + reestablishing) |
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time_t last_activity; // time of last packet received |
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u32 oseqno; |
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u32 iseqno; |
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u32 ismask; // bitmask with set bits for each received seqno (input seen mask) |
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pkt_queue queue; |
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crypto_ctx *octx, *ictx; |
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void reset_dstaddr (); |
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void shutdown (); |
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void reset_connection (); |
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void establish_connection (); |
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void rekey (); |
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void send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k = 0); |
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void send_reset (SOCKADDR *dsa); |
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void send_ping (SOCKADDR *dss, u8 pong = 0); |
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void send_data_packet (tap_packet *pkt, bool broadcast = false); |
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void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
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void connect_request (int id); |
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void recv_vpn_packet (vpn_packet *pkt, SOCKADDR *rsa); |
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void timer (); |
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connection(struct vpn *vpn_) |
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: vpn(vpn_) |
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{ |
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octx = ictx = 0; |
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retry_cnt = 0; |
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reset_connection (); |
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} |
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~connection () |
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{ |
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shutdown (); |
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} |
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void script_node (); |
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const char *script_node_up (); |
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const char *script_node_down (); |
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}; |
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struct vpn |
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{ |
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int socket_fd; |
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int events; |
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tap_device *tap; |
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enum { |
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EVENT_RECONNECT = 1, |
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EVENT_SHUTDOWN = 2, |
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}; |
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typedef vector<connection *> conns_vector; |
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conns_vector conns; |
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connection *find_router (); |
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void send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa); |
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void reconnect_all (); |
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void shutdown_all (); |
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void connect_request (int id); |
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vpn (); |
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~vpn (); |
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int setup (); |
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void main_loop (); |
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const char *script_if_up (); |
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}; |
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#endif |
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