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/*
* ptunnel.h
* ptunnel is licensed under the BSD license:
*
* Copyright (c) 2004-2011, Daniel Stoedle <daniels@cs.uit.no>,
* Yellow Lemon Software. All rights reserved.
*
* 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 Stoedle (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 PING_TUNNEL_H
#define PING_TUNNEL_H 1
#ifndef WIN32
#ifdef HAVE_ICMPFILTER
#include <linux/icmp.h>
#endif
#ifdef HAVE_SYS_UNISTD_H
#include <sys/unistd.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pthread.h>
#include <errno.h>
#include <net/ethernet.h>
#include <syslog.h>
#include <pwd.h>
#include <grp.h>
#endif /* !WIN32 */
#include <stdarg.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include <stdint.h>
#include <stdbool.h>
#ifdef HAVE_PCAP
#include <pcap.h>
#endif
#include "pkt.h"
#include "pdesc.h"
#include "challenge.h"
#ifdef WIN32
/* pthread porting to windows */
typedef CRITICAL_SECTION pthread_mutex_t;
typedef unsigned long pthread_t;
#define pthread_mutex_init InitializeCriticalSectionAndSpinCount
#define pthread_mutex_lock EnterCriticalSection
#define pthread_mutex_unlock LeaveCriticalSection
#endif
extern pthread_mutex_t chain_lock;
extern uint32_t num_tunnels;
extern const int icmp_receive_buf_len;
extern proxy_desc_t *chain;
extern uint32_t *seq_expiry_tbl;
extern const char *state_name[kNum_proto_types];
/* pt_thread_info_t: A simple (very simple, in fact) structure that allows us
* to pass an arbitrary number of params to the threads we create. Currently,
* that's just one single parameter: The socket which the thread should listen
* to.
*/
typedef struct {
int sock;
} pt_thread_info_t;
/* pqueue_elem_t: An queue element in the pqueue structure (below).
*/
typedef struct pqueue_elem_t {
/** size of data buffer */
unsigned long bytes;
/** next queue element (if any) */
struct pqueue_elem_t *next;
/** optional data */
char data[0];
} pqueue_elem_t;
/* pqueue_t: A simple queue strucutre.
*/
typedef struct {
pqueue_elem_t *head;
pqueue_elem_t *tail;
int elems;
} pqueue_t;
#ifdef HAVE_PCAP
/* pcap_info_t: Structure to hold information related to packet capturing.
*/
typedef struct {
pcap_t *pcap_desc;
/** compiled filter program */
struct bpf_program fp;
uint32_t netp;
uint32_t netmask;
/** buffers for error info */
char *pcap_err_buf;
/** buffers for packet info */
char *pcap_data_buf;
/** queue of packets to process */
pqueue_t pkt_q;
} pcap_info_t;
#endif
/* function Prototypes */
void* pt_proxy(void *args);
#ifdef HAVE_PCAP
void pcap_packet_handler(u_char *refcon, const struct pcap_pkthdr *hdr,
const u_char* pkt);
#endif
void pt_forwarder(void);
void print_statistics(xfer_stats_t *xfer, int is_continuous);
void init_ip_packet(ip_packet_t *packet, uint16_t id, uint16_t frag_offset,
uint16_t pkt_len, uint8_t ttl, uint32_t src_ip, uint32_t dst_ip,
bool is_last_frag, bool dont_frag);
uint16_t calc_icmp_checksum(uint16_t *data, int bytes);
void send_termination_msg(proxy_desc_t *cur, int icmp_sock);
#endif
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