include/common.h

   1 /* -------------------------------------------------------------------------
   2  * common.h - htun common defs
   3  * Copyright (C) 2002 Moshe Jacobson <moshe@runslinux.net>,
   4  *                    Ola Nordström <ola@triblock.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  * -------------------------------------------------------------------------
  20  */
  21 /* $Id: common.h,v 2.24 2003/02/22 21:14:10 ola Exp $ */
  22
  23 #ifndef __COMMON_H
  24 #define __COMMON_H
  25
  26 #include <netinet/in.h>
  27 #include <time.h>
  28 #include "queue.h"
  29 #include "log.h"
  30 #include "server.h"
  31 #include "iprange.h"
  32
  33 #define HTUN_MAXPACKET 65536
  34 #define HTUN_DEFAULT_CFGFILE "/etc/htund.conf"
  35 #define HTUN_MAXCLIENTS 10
  36 #define HTUN_MAXPENDING 5
  37 #define HTUN_SOCKPENDING 10
  38
  39 #ifdef _DEBUG
  40 #define dprintf lprintf
  41 #else
  42 #define dprintf(...)
  43 #endif
  44
  45 #define iplen(pkt) \
  46     ( (unsigned short)( ((((pkt)[6]&0xFF)<<8) | ((pkt)[7]&0xFF)) + 4 ) )
  47
  48 #define ipdst(pkt) htonl(((pkt)[20]<<24 | (pkt)[21]<<16 | (pkt)[22]<<8 | (pkt)[23]))
  49 #define ipsrc(pkt) htonl(((pkt)[16]<<24 | (pkt)[17]<<16 | (pkt)[18]<<8 | (pkt)[19]))
  50 #define max(a,b) ((a)>(b)?(a):(b))
  51 #define min(a,b) ((b)>(a)?(a):(b))
  52
  53 struct server_config {
  54     unsigned short max_clients;
  55     unsigned short max_pending;
  56     unsigned short idle_disconnect;
  57     unsigned short server_ports[2];
  58     unsigned short min_nack_delay;
  59     unsigned short packet_count_threshold;
  60     unsigned long  packet_max_interval;
  61     unsigned short max_response_delay;
  62     time_t clidata_timeout;
  63     iprange_t *ipr;
  64     char *redir_host;
  65     unsigned short redir_port;
  66 };
  67
  68 struct client_config {
  69     unsigned short proxy_port;
  70     unsigned short server_ports[2];
  71     struct in_addr proxy_ip;
  72     struct in_addr server_ip;
  73     struct in_addr local_ip;
  74     struct in_addr peer_ip;
  75     unsigned short do_routing;
  76     unsigned short max_poll_interval;
  77     unsigned long  min_poll_interval_msec;
  78     unsigned short poll_backoff_rate;
  79     int channel_2_idle_allow;
  80     int connect_tries;
  81     int reconnect_tries;
  82     int reconnect_sleep_sec;
  83     int protocol;
  84     int ack_wait;
  85     iprange_t *ipr;
  86     /* Put the large data at the end to speed up access to smaller data */
  87     char proxy_ip_str[16];
  88     char server_ip_str[16];
  89     char local_ip_str[16]; /* virual tun if */
  90     char peer_ip_str[16]; /* server virtual tun if */
  91     char if_name[16]; /* eth0, eth1 etc.. */
  92     char proxy_user[41];
  93     char proxy_pass[81];
  94     char base64_user_pass[300];
  95 };
  96
  97 typedef struct {
  98     char cfgfile[PATH_MAX];
  99     char tunfile[PATH_MAX];
 100     char logfile[PATH_MAX];
 101     int is_server;
 102     int demonize;
 103     int debug;
 104
 105     union {
 106         struct server_config s;
 107         struct client_config c;
 108     } u;
 109 } config_data_t;
 110
 111 /* Reads the configuration and returns a dynamically allocated struct with the
 112  * data */
 113 config_data_t *read_config( const char *configfile );
 114
 115 /* dumps the config struct to the screen */
 116 void print_config( config_data_t *configfile );
 117
 118 /* Reads exactly one packet's worth of data from tunfd and returns it in a
 119  * dynamically allocated char buffer. */
 120 char *get_packet( int tunfd );
 121
 122 /* Become a daemon: fork, die, setsid, fork, die, disconnect */
 123 void daemonize( void );
 124
 125 /* Check the validity of the configuration data */
 126 int config_check( config_data_t *c );
 127
 128 /* Drop privileges to nobody. Optional reason for log */
 129 void dropprivs(char *reason);
 130
 131 /* Get root privileges back. Optional reason for log */
 132 void getprivs(char *reason);
 133
 134 /* initialize signames[] array */
 135 void init_signames(void);
 136
 137 /* Variables used by other modules */
 138 extern log_t *log;
 139 extern config_data_t *config;
 140 extern char *signames[64]; /* 64 names of signals */
 141
 142 #endif /* _COMMON_DEFS_H_ */