diff options
Diffstat (limited to 'src/pdesc.h')
| -rw-r--r-- | src/pdesc.h | 188 |
1 files changed, 6 insertions, 182 deletions
diff --git a/src/pdesc.h b/src/pdesc.h index 62740df..fbd9c7c 100644 --- a/src/pdesc.h +++ b/src/pdesc.h @@ -1,188 +1,12 @@ -/* - * pdesc.h - * ptunnel is licensed under the BSD license: - * - * Copyright (c) 2004-2011, Daniel Stoedle <daniels@cs.uit.no>, - * Yellow Lemon Software. All rights reserved. - * - * Copyright (c) 2017-2019, Toni Uhlig <matzeton@googlemail.com> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * - Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * - Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * - * - Neither the name of the Yellow Lemon Software nor the names of its - * contributors may be used to endorse or promote products derived from this - * software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - * Contacting the author: - * You can get in touch with me, Daniel Stødle (that's the Norwegian letter oe, - * in case your text editor didn't realize), here: <daniels@cs.uit.no> - * - * The official ptunnel website is here: - * <http://www.cs.uit.no/~daniels/PingTunnel/> - * - * Note that the source code is best viewed with tabs set to 4 spaces. - */ - #ifndef PDESC_H -#define PDESC_H 1 +#define PDESC_H #include <stdint.h> -#ifndef WIN32 -#include <sys/socket.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#endif - -#include "pkt.h" -#include "challenge.h" -#include "pconfig.h" - -/** forward_desc_t: Describes a piece of that needs to be forwarded. This - * structure is used for receiving data from the network, and for subsequent - * forwarding over TCP: - * - * 1. Client sends data to proxy over ICMP - * 2. Proxy receives the data, and puts it into a forward_desc_t - * 3. The proxy starts send()-ing the data over the TCP socket to the destination, - * decreasing forward_desc_t->remaining with the number of bytes transferred. - * 4. Once remaining reaches 0, the forward_desc_t is removed from the receive - * ring. - * - * The same procedure is followed in proxy-to-client communication. Just replace - * proxy with client and vice versa in the list above. - */ -typedef struct forward_desc_t { - /** ping_tunnel_pkt_t seq_no */ - uint16_t seq_no; - /** length of data */ - uint16_t length; - /** amount of data not yet transferred */ - size_t remaining; - char data[0]; -} forward_desc_t; - -/** icmp_desc_t: This structure is used to track the ICMP packets sent by either - * the client or proxy. The last_resend variable is used to prevent resending - * the packet too often. Once the packet is acknowledged by the remote end, - * it will be removed from the send-ring, freeing up space for more outgoing - * ICMP packets. - */ -typedef struct icmp_desc_t { - /** total length of ICMP packet, including ICMP header and ptunnel data. */ - uint16_t pkt_len; - double last_resend; - uint16_t seq_no; - uint16_t icmp_id; - icmp_echo_packet_t * pkt; -} icmp_desc_t; - -/** xfer_stats_t: Various transfer statistics, such as bytes sent and received, - * number of ping packets sent/received, etc. - */ -typedef struct xfer_stats_t { - double bytes_in; - double bytes_out; - uint32_t icmp_in; - uint32_t icmp_out; - uint32_t icmp_resent; - uint32_t icmp_ack_out; -} xfer_stats_t; - -/** proxy_desc_t: This massive structure describes a tunnel instance. - */ -typedef struct proxy_desc_t { - /** ICMP or UDP socket */ - int sock; - /** number of bytes in receive buffer */ - int bytes; - /** set to true once this instance should be removed */ - int should_remove; - /** data buffer, used to receive ping and pong packets */ - char * buf; - uint16_t id_no; - uint16_t my_seq; - uint16_t ping_seq; - uint16_t next_remote_seq; - uint16_t pkt_type; - uint16_t remote_ack_val; - uint16_t icmp_id; - /** first available slot in recv ring */ - int recv_idx; - /** current slot in recv ring being transferred */ - int recv_xfer_idx; - /** first available slot in send ring */ - int send_idx; - /** first packet in send ring not yet acked */ - int send_first_ack; - /** number of items in recv ring awaiting send */ - int recv_wait_send; - /** number of items in send ring awaiting ack */ - int send_wait_ack; - int next_resend_start; - int authenticated; - /** Contains the challenge, if used. */ - challenge_t * challenge; - /** Protocol state */ - uint32_t state; - /** Either kProxy_flag or kUser_flag */ - enum pkt_flag type_flag; - /** IP and port to which data should be forwarded. */ - uint32_t dst_ip; - uint32_t dst_port; - /** Same as above */ - struct sockaddr_in dest_addr; - /** Time when last ack packet was sent. */ - double last_ack; - /** Time when a packet was last received. */ - double last_activity; - double last_data_activity; - uint16_t window_size; - double ack_interval; - double resend_interval; - icmp_desc_t * send_ring; - forward_desc_t ** recv_ring; - xfer_stats_t xfer; - struct proxy_desc_t * next; -} proxy_desc_t; - -proxy_desc_t * create_and_insert_proxy_desc(uint16_t id_no, - uint16_t icmp_id, - int sock, - struct sockaddr_in * addr, - uint32_t dst_ip, - uint32_t dst_port, - uint32_t init_state, - enum pkt_flag type); - -void remove_proxy_desc(proxy_desc_t * cur, proxy_desc_t * prev); - -void remove_proxy_desc_rings(proxy_desc_t * cur); - -forward_desc_t * create_fwd_desc(uint16_t seq_no, uint32_t data_len, char * data); - -int queue_packet( - int sock_fd, proxy_desc_t * cur, char * buf, size_t bufsiz, uint32_t dest_ip, uint32_t dest_port, uint32_t state); -uint32_t send_packets(forward_desc_t * ring[], int * xfer_idx, int * await_send, int * sock, uint16_t window_size); +struct pdesc +{ + uint16_t identifier; + uint16_t sequence; +}; #endif |