utils.h

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/* ==================================================================== 
 * The Kannel Software License, Version 1.0 
 * 
 * Copyright (c) 2001-2018 Kannel Group  
 * Copyright (c) 1998-2001 WapIT Ltd.   
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. 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. 
 * 
 * 3. The end-user documentation included with the redistribution, 
 *    if any, must include the following acknowledgment: 
 *       "This product includes software developed by the 
 *        Kannel Group (http://www.kannel.org/)." 
 *    Alternately, this acknowledgment may appear in the software itself, 
 *    if and wherever such third-party acknowledgments normally appear. 
 * 
 * 4. The names "Kannel" and "Kannel Group" must not be used to 
 *    endorse or promote products derived from this software without 
 *    prior written permission. For written permission, please  
 *    contact org@kannel.org. 
 * 
 * 5. Products derived from this software may not be called "Kannel", 
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 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 
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 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,  
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 * ==================================================================== 
 * 
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Kannel Group.  For more information on  
 * the Kannel Group, please see <http://www.kannel.org/>. 
 * 
 * Portions of this software are based upon software originally written at  
 * WapIT Ltd., Helsinki, Finland for the Kannel project.  
 */ 

/*
 * utils.c - generally useful, non-application specific functions for Gateway
 *
 * Kalle Marjola <rpr@wapit.com>
 */

#ifndef GW_UTILS_H
#define GW_UTILS_H

#include <stddef.h>
#include <stdio.h>
#include "octstr.h"
#include <termios.h>

/*
 * Octet and MultibyteInteger (variable length) functions
 */

typedef unsigned char Octet;        /* 8-bit basic data */
typedef unsigned long MultibyteInt; /* limited to 32 bits, not 35 */

/* get value of a multibyte ineteger. Note that it MUST be a valid
 * numbers, otherwise an overflow may occur as the function keeps
 * on reading the number until continue-bit (high bit) is not set.
 * Does not fail, always returns some number, but may overflow. */
MultibyteInt get_variable_value(Octet *source, int *len);

/* write given multibyte integer into given destination string, which
 * must be large enough to handle the number (5 bytes is always sufficient)
 * returns the total length of the written number, in bytes. Does not fail */
int write_variable_value(MultibyteInt value, Octet *dest);

/* reverse the value of an octet */
Octet reverse_octet(Octet source);

/* parse command line arguments and set options for the following
 * global arguments:
 * 
 *   -v or --verbosity
 *   -D or --debug
 *   -F or --logfile
 *   -V or --fileverbosity
 *   -X or --panic-script
 *   -P or --parachute
 *   -d or --daemonize
 *   -p or --pid-file
 *   -u or --user
 *   -g or --generate
 *
 * Any other argument starting with '-' calls 'find_own' function,
 * which is provided by the user. If set to NULL, these are ignored
 * (but error message is put into stderr)
 *
 * Returns index of next argument after any parsing 
 *
 * Function 'find_own' has following parameters:
 *   index is the current index in argv
 *   argc and argv are command line parameters, directly transfered 
 *
 *   the function returns any extra number of parameters needed to be
 *   skipped. It must personally deal with any malformed arguments.
 *   It return -1 if it cannot find match for the argument
 *
 * sample simple function is like:
 *   int find_is_there_X(int i, int argc, char **argv)
 *      {  if (strcmp(argv[i], "-X")==0) return 0; else return -1; } 
 */
int get_and_set_debugs(int argc, char **argv,
               int (*find_own) (int index, int argc, char **argv));


/*
 * return 0 if 'ip' is denied by deny_ip and not allowed by allow_ip
 * return 1 otherwise (deny_ip is NULL or 'ip' is in allow_ip or is not
 *  in deny_ip)
 * return -1 on error ('ip' is NULL)
 */
int is_allowed_ip(Octstr *allow_ip, Octstr *deny_ip, Octstr *ip);

/*
 * Return 1 if 'ip' is not allowed to connect, when 'allow_ip' defines
 * allowed hosts, and 0 if connect ok. If 'allow_ip' is NULL, check against
 * "127.0.0.1" (localhost)
 */
int connect_denied(Octstr *allow_ip, Octstr *ip);

/*
 * Checks if a given prefix list seperated with semicolon does match
 * a given number.
 *
 * This is mainly used for the allowed-prefix, denied-prefix configuration
 * directives.
 */
int does_prefix_match(Octstr *prefix, Octstr *number);

/*
 * Normalize 'number', like change number "040500" to "0035840500" if
 * the dial-prefix is like "0035840,040;0035850,050"
 *
 * return -1 on error, 0 if no match in dial_prefixes and 1 if match found
 * If the 'number' needs normalization, it is done.
 */
int normalize_number(char *dial_prefixes, Octstr **number);

/*
 * Convert a standard "network long" (32 bits in 4 octets, most significant
 * octet first) to the host representation.
 */
long decode_network_long(unsigned char *data);


/*
 * Convert a long to the standard network representation (32 bits in 4
 * octets, most significant octet first).
 */
void encode_network_long(unsigned char *data, unsigned long value);


/* kannel implementation of cfmakeraw, which is an extension in GNU libc */
void kannel_cfmakeraw (struct termios *tio);


/*
 * Wrappers around the isdigit and isxdigit functions that are guaranteed
 * to be functions, not macros. (The standard library functions are also
 * guaranteed by the C standard to be functions, in addition to possibly
 * also being macros, but not all implementations follow the standard.)
 */
int gw_isdigit(int);
int gw_isxdigit(int);


/*
 * Rounds up the result of a division
 */
int roundup_div(int a, int b);


/*
 * generate a unique id 
 * (not guarenteed to be unique, but it's extremly unlikely for it not to be)
 */
unsigned long long gw_generate_id(void);

void init_fatal_signals(void);

/*
 * Return an octet string with information about Kannel version,
 * operating system, and libxml version. The caller must take care to
 * destroy the string when done.
 */
Octstr *version_report_string(const char *boxname);


/*
 * Output the information returned by version_report_string to the log
 * files.
 */
void report_versions(const char *boxname);


#endif