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pdu.cpp
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pdu.cpp
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/*
Based on SMS Server Tools 3
Copyright (C) 2006- Keijo Kasvi
http://smstools3.kekekasvi.com/
This program is free software unless you got it under another license directly
from the author. You can redistribute it and/or modify it under the terms of
the GNU General Public License as published by the Free Software Foundation.
Either version 2 of the License, or (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <iconv.h>
#include "pdu.h"
// Global constants. FIXME: set correct values
const int max_number = 64;
const int max_number_type = 1024;
const int max_smsc = 64;
const int max_date = 32;
const int max_time = 32;
const int max_udh_data = 512;
const int max_udh_type = 512;
const int max_err = 1024;
const int maxsms_binary = 140;
const int max_message = maxsms_binary * 4;
const int validity_period = 255;
const int max_pdu = 160;
// Utility functions
// TODO: remove it!
char *strcpyo(char *dest, const char *src)
{
size_t i;
for (i = 0; src[i] != '\0'; i++)
dest[i] = src[i];
dest[i] = '\0';
return dest;
}
// Converts an octet to a 8-Bit value
int octet2bin(const char* octet)
{
int result = 0;
if (octet[0] > 57)
result += octet[0] - 55;
else
result += octet[0] - 48;
result = result << 4;
if (octet[1] > 57)
result += octet[1] - 55;
else
result += octet[1] - 48;
return result;
}
// Converts an octet to a 8bit value, returns < in case of error.
int octet2bin_check(const char *octet)
{
if (octet[0] == 0)
return -1;
if (octet[1] == 0)
return -2;
if (!isxdigit(octet[0]))
return -3;
if (!isxdigit(octet[1]))
return -4;
return octet2bin(octet);
}
// Swap every second character
void swapchars(char* string)
{
char c;
int length = strlen(string);
for (int i = 0; i < length - 1; i += 2)
{
c = string[i];
string[i] = string[i + 1];
string[i + 1] = c;
}
}
// Returns a length of udh (including UDHL), -1 if error.
// pdu is 0-terminated ascii(hex) pdu string with
// or without spaces.
int explain_udh(char *udh_type, const char *pdu)
{
int udh_length;
int idx;
char *pdu_ptr;
char *p;
const char *p1 = NULL;
int i;
char tmp[512];
char buffer[1024];
*udh_type = 0;
if (strlen(pdu) >= sizeof(buffer))
return -1;
strcpy(buffer, pdu);
while ((p = strchr(buffer, ' ')))
strcpyo(p, p +1);
if ((udh_length = octet2bin_check(buffer)) < 0)
return -1;
udh_length++;
if ((size_t)(udh_length *2) > strlen(buffer))
return -1;
sprintf(udh_type, "Length=%i", udh_length);
idx = 1;
while (idx < udh_length)
{
pdu_ptr = buffer + idx * 2;
p = NULL;
i = octet2bin_check(pdu_ptr);
switch (i)
{
case -1: return -1;
// 3GPP TS 23.040 version 6.8.1 Release 6 - ETSI TS 123 040 V6.8.1 (2006-10)
case 0x00: p1 = "Concatenated short messages, 8-bit reference number"; break;
case 0x01: p1 = "Special SMS Message Indication"; break;
case 0x02: p1 = "Reserved"; break;
//case 0x03: p = "Value not used to avoid misinterpretation as <LF> character"; break;
case 0x04: p1 = "Application port addressing scheme, 8 bit address"; break;
case 0x05: p1 = "Application port addressing scheme, 16 bit address"; break;
case 0x06: p1 = "SMSC Control Parameters"; break;
case 0x07: p1 = "UDH Source Indicator"; break;
case 0x08: p1 = "Concatenated short message, 16-bit reference number"; break;
case 0x09: p1 = "Wireless Control Message Protocol"; break;
case 0x0A: p1 = "Text Formatting"; break;
case 0x0B: p1 = "Predefined Sound"; break;
case 0x0C: p1 = "User Defined Sound (iMelody max 128 bytes)"; break;
case 0x0D: p1 = "Predefined Animation"; break;
case 0x0E: p1 = "Large Animation (16*16 times 4 = 32*4 =128 bytes)"; break;
case 0x0F: p1 = "Small Animation (8*8 times 4 = 8*4 =32 bytes)"; break;
case 0x10: p1 = "Large Picture (32*32 = 128 bytes)"; break;
case 0x11: p1 = "Small Picture (16*16 = 32 bytes)"; break;
case 0x12: p1 = "Variable Picture"; break;
case 0x13: p1 = "User prompt indicator"; break;
case 0x14: p1 = "Extended Object"; break;
case 0x15: p1 = "Reused Extended Object"; break;
case 0x16: p1 = "Compression Control"; break;
case 0x17: p1 = "Object Distribution Indicator"; break;
case 0x18: p1 = "Standard WVG object"; break;
case 0x19: p1 = "Character Size WVG object"; break;
case 0x1A: p1 = "Extended Object Data Request Command"; break;
case 0x20: p1 = "RFC 822 E-Mail Header"; break;
case 0x21: p1 = "Hyperlink format element"; break;
case 0x22: p1 = "Reply Address Element"; break;
case 0x23: p1 = "Enhanced Voice Mail Information"; break;
}
if (!p1)
{
if (i >= 0x1B && i <= 0x1F)
p1 = "Reserved for future EMS features";
else if (i >= 0x24 && i <= 0x6F)
p1 = "Reserved for future use";
else if (i >= 0x70 && i <= 0x7F)
p1 = "(U)SIM Toolkit Security Headers";
else if (i >= 0x80 && i <= 0x9F)
p1 = "SME to SME specific use";
else if (i >= 0xA0 && i <= 0xBF)
p1 = "Reserved for future use";
else if (i >= 0xC0 && i <= 0xDF)
p1 = "SC specific use";
else if (i >= 0xE0 && i <= 0xFF)
p1 = "Reserved for future use";
}
if (!p1)
p1 = "unknown";
sprintf(tmp, ", [%.2s]%s", pdu_ptr, p1);
if (strlen(udh_type) + strlen(tmp) >= (size_t)max_udh_type)
return -1;
sprintf(strchr(udh_type, 0), "%s", tmp);
// Next octet is length of data:
if ((i = octet2bin_check(pdu_ptr + 2)) < 0)
return -1;
if ((size_t)(i *2) > strlen(pdu_ptr + 4))
return -1;
idx += i + 2;
if (idx > udh_length)
return -1; // Incorrect UDL or length of Information Element.
}
return udh_length;
}
void explain_status(char *dest, size_t size_dest, int status)
{
const char *p = "unknown";
switch (status)
{
case 0: p = "Ok, short message received by the SME"; break;
case 1: p = "Ok, short message forwarded by the SC to the SME but the SC is unable to confirm delivery"; break;
case 2: p = "Ok, short message replaced by the SC"; break;
// Temporary error, SC still trying to transfer SM
case 32: p = "Still trying, congestion"; break;
case 33: p = "Still trying, SME busy"; break;
case 34: p = "Still trying, no response sendr SME"; break;
case 35: p = "Still trying, service rejected"; break;
case 36: p = "Still trying, quality of service not available"; break;
case 37: p = "Still trying, error in SME"; break;
// 38...47: Reserved
// 48...63: Values specific to each SC
// Permanent error, SC is not making any more transfer attempts
case 64: p = "Error, remote procedure error"; break;
case 65: p = "Error, incompatible destination"; break;
case 66: p = "Error, connection rejected by SME"; break;
case 67: p = "Error, not obtainable"; break;
case 68: p = "Error, quality of service not available"; break;
case 69: p = "Error, no interworking available"; break;
case 70: p = "Error, SM validity period expired"; break;
case 71: p = "Error, SM deleted by originating SME"; break;
case 72: p = "Error, SM deleted by SC administration"; break;
case 73: p = "Error, SM does not exist"; break;
// 74...79: Reserved
// 80...95: Values specific to each SC
// Permanent error, SC is not making any more transfer attempts
case 96: p = "Error, congestion"; break;
case 97: p = "Error, SME busy"; break;
case 98: p = "Error, no response sendr SME"; break;
case 99: p = "Error, service rejected"; break;
case 100: p = "Error, quality of service not available"; break;
case 101: p = "Error, error in SME"; break;
// 102...105: Reserved
// 106...111: Reserved
// 112...127: Values specific to each SC
// 128...255: Reserved
default:
if (status >= 48 && status <= 63)
p = "Temporary error, SC specific, unknown";
else if ((status >= 80 && status <= 95) || (status >= 112 && status <= 127))
p = "Permanent error, SC specific, unknown";
}
snprintf(dest, size_dest, "%s", p);
}
int pdu2text(const char *pdu, char *text, int *text_length, int *expected_length,
int with_udh, char *udh, char *udh_type, int *errorpos)
{
int bitposition;
int byteposition;
int byteoffset;
int charcounter;
int bitcounter;
int septets;
int octets;
int udhsize;
int octetcounter;
int skip_characters = 0;
char c;
char binary = 0;
int i;
int result;
if (udh)
*udh = 0;
if (udh_type)
*udh_type = 0;
if ((septets = octet2bin_check(pdu)) < 0)
{
if (errorpos)
*errorpos = -1 * septets -3;
return (septets >= -2)? -2: -1;
}
if (with_udh)
{
// copy the data header to udh and convert to hex dump
// There was at least one octet and next will give an error if there is no more data:
if ((udhsize = octet2bin_check(pdu +2)) < 0)
{
if (errorpos)
*errorpos = -1 * udhsize -3 +2;
return (udhsize >= -2)? -2: -1;
}
i = 0;
result = -1;
for (octetcounter = 0; octetcounter < udhsize + 1; octetcounter++)
{
if (octetcounter *3 +3 >= max_udh_data)
{
i = octetcounter *2 +2;
result = -2;
break;
}
udh[octetcounter*3]=pdu[(octetcounter<<1)+2];
if (!isxdigit(udh[octetcounter *3]))
{
i = octetcounter *2 +2;
if (!udh[octetcounter *3])
result = -2;
break;
}
udh[octetcounter*3+1]=pdu[(octetcounter<<1)+3];
if (!isxdigit(udh[octetcounter *3 +1]))
{
i = octetcounter *2 +3;
if (!udh[octetcounter *3 +1])
result = -2;
break;
}
udh[octetcounter *3 +2] = ' ';
udh[octetcounter *3 +3] = 0;
}
if (i)
{
if (errorpos)
*errorpos = i;
return result;
}
if (udh_type)
if (explain_udh(udh_type, pdu + 2) < 0)
if (strlen(udh_type) + 7 < (size_t)max_udh_type)
sprintf(strchr(udh_type, 0), "%sERROR", (*udh_type)? ", " : "");
// Calculate how many text charcters include the UDH.
// After the UDH there may follow filling bits to reach a 7bit boundary.
skip_characters=(((udhsize+1)*8)+6)/7;
}
if (expected_length)
*expected_length = septets - skip_characters;
// Convert from 8-Bit to 7-Bit encapsulated in 8 bit
// skipping storing of some characters used by UDH.
// 3.1beta7: Simplified handling to allow partial decodings to be shown.
octets = (septets *7 +7) /8;
bitposition = 0;
octetcounter = 0;
for (charcounter = 0; charcounter < septets; charcounter++)
{
c = 0;
for (bitcounter = 0; bitcounter < 7; bitcounter++)
{
byteposition = bitposition /8;
byteoffset = bitposition %8;
while (byteposition >= octetcounter && octetcounter < octets)
{
if ((i = octet2bin_check(pdu +(octetcounter << 1) +2)) < 0)
{
if (errorpos)
{
*errorpos = octetcounter *2 +2;
if (i == -2 || i == -4)
(*errorpos)++;
}
if (text_length)
*text_length = charcounter -skip_characters;
return (i >= -2)? -2: -1;
}
binary = i;
octetcounter++;
}
if (binary & (1 << byteoffset))
c = c | 128;
bitposition++;
c = (c >> 1) & 127; // The shift fills with 1, but 0 is wanted.
}
if (charcounter >= skip_characters)
text[charcounter -skip_characters] = c;
}
if (text_length)
*text_length = charcounter -skip_characters;
if (charcounter -skip_characters >= 0)
text[charcounter -skip_characters] = 0;
return charcounter -skip_characters;
}
int pdu2text0(char *pdu, char *text)
{
return pdu2text(pdu, text, 0, 0, 0, 0, 0, 0);
}
// Converts a PDU string to binary. Return -1 if there is a PDU error, -2 if PDU is too short.
// Version > 3.0.9, > 3.1beta6 handles also udh.
int pdu2binary(const char* pdu, char* binary, int *data_length,
int *expected_length, int with_udh, char *udh, char *udh_type,
int *errorpos)
{
int octets;
int octetcounter;
int i;
int udhsize = 0;
int skip_octets = 0;
int result;
*udh = 0;
*udh_type = 0;
if ((octets = octet2bin_check(pdu)) < 0)
{
*errorpos = -1 * octets -3;
return (octets >= -2)? -2: -1;
}
if (with_udh)
{
// copy the data header to udh and convert to hex dump
// There was at least one octet and next will give an error if there is no more data:
if ((udhsize = octet2bin_check(pdu +2)) < 0)
{
*errorpos = -1 * udhsize -3 +2;
return (udhsize >= -2)? -2: -1;
}
i = 0;
result = -1;
for (octetcounter = 0; octetcounter < udhsize +1; octetcounter++)
{
if (octetcounter *3 +3 >= max_udh_data)
{
i = octetcounter *2 +2;
result = -2;
break;
}
udh[octetcounter *3] = pdu[(octetcounter << 1) +2];
if (!isxdigit(udh[octetcounter *3]))
{
i = octetcounter *2 +2;
if (!udh[octetcounter *3])
result = -2;
break;
}
udh[octetcounter *3 +1] = pdu[(octetcounter << 1) +3];
if (!isxdigit(udh[octetcounter *3 +1]))
{
i = octetcounter *2 +3;
if (!udh[octetcounter *3 +1])
result = -2;
break;
}
udh[octetcounter *3 +2] = ' ';
udh[octetcounter *3 +3] = 0;
}
if (i)
{
*errorpos = i;
return result;
}
if (udh_type)
if (explain_udh(udh_type, pdu + 2) < 0)
if (strlen(udh_type) + 7 < (size_t)max_udh_type)
sprintf(strchr(udh_type, 0), "%sERROR", (*udh_type)? ", " : "");
skip_octets = udhsize + 1;
}
*expected_length = octets -skip_octets;
for (octetcounter = 0; octetcounter < octets - skip_octets; octetcounter++)
{
if ((i = octet2bin_check(pdu +(octetcounter << 1) +2 +(skip_octets *2))) < 0)
{
*errorpos = octetcounter *2 +2 +(skip_octets *2);
if (i == -2 || i == -4)
(*errorpos)++;
*data_length = octetcounter;
return (i >= -2)? -2: -1;
}
else
binary[octetcounter] = i;
}
if (octets -skip_octets >= 0)
binary[octets -skip_octets] = 0;
*data_length = octets -skip_octets;
return octets -skip_octets;
}
// Converts an ascii text to a pdu string
// text might contain zero values because this is a valid character code in sms
// character set. Therefore we need the length parameter.
// If udh is not 0, then insert it to the beginning of the message.
// The string must be in hex-dump format: "05 00 03 AF 02 01".
// The first byte is the size of the UDH.
int text2pdu(char* text, int length, char* pdu, char* udh)
{
char tmp[500];
char octett[10];
int pdubitposition;
int pdubyteposition = 0;
int character;
int bit;
int pdubitnr;
int counted_characters = 0;
int udh_size_octets; // size of the udh in octets, should equal to the first byte + 1
int udh_size_septets; // size of udh in septets (7bit text characters)
int fillbits; // number of filler bits between udh and ud.
int counter;
pdu[0]=0;
// Check the udh
if (udh)
{
udh_size_octets = (strlen(udh) + 2) / 3;
udh_size_septets = ((udh_size_octets) * 8 + 6) / 7;
fillbits = 7 - (udh_size_octets % 7);
if (fillbits == 7)
fillbits = 0;
// copy udh to pdu, skipping the space characters
for (counter = 0; counter < udh_size_octets; counter++)
{
pdu[counter * 2] = udh[counter * 3];
pdu[counter * 2 + 1] = udh[counter * 3 + 1];
}
pdu[counter * 2] = 0;
}
else
{
udh_size_octets = 0;
udh_size_septets = 0;
fillbits = 0;
}
// limit size of the message to maximum allowed size
if (length > max_pdu - udh_size_septets)
length = max_pdu - udh_size_septets;
//clear the tmp buffer
for (character = 0; (size_t)character < sizeof(tmp); character++)
tmp[character] = 0;
// Convert 8bit text stream to 7bit stream
for (character = 0; character < length; character++)
{
counted_characters++;
for (bit = 0; bit < 7; bit++)
{
pdubitnr= 7 * character + bit + fillbits;
pdubyteposition = pdubitnr / 8;
pdubitposition = pdubitnr % 8;
if (text[character] & (1 << bit))
tmp[pdubyteposition] = tmp[pdubyteposition] | (1 << pdubitposition);
else
tmp[pdubyteposition] = tmp[pdubyteposition] & ~(1 << pdubitposition);
}
}
tmp[pdubyteposition + 1] = 0;
// convert 7bit stream to hex-dump
for (character = 0; character <= pdubyteposition; character++)
{
sprintf(octett, "%02X", (unsigned char)tmp[character]);
strcat(pdu, octett);
}
return counted_characters + udh_size_septets;
}
/* Converts binary to PDU string, this is basically a hex dump. */
void binary2pdu(char* binary, int length, char* pdu)
{
int character;
char octett[10];
if (length > maxsms_binary)
length = maxsms_binary;
pdu[0] = 0;
for (character = 0; character < length; character++)
{
sprintf(octett, "%02X", (unsigned char)binary[character]);
strcat(pdu, octett);
}
}
// Constructors/destructor
PDU::PDU() :
m_pdu(NULL), m_pdu_ptr(NULL), m_message(NULL), m_message_len(-1),
m_smsc(NULL), m_number(NULL), m_number_type(NULL), m_number_fmt(NF_UNKNOWN),
m_date(NULL), m_time(NULL), m_udh_type(NULL), m_udh_data(NULL), m_err(NULL),
m_with_udh(false), m_report(false), m_is_statusreport(false), m_replace(0),
m_alphabet(-1), m_flash(false), m_mode(NULL), m_validity(170),
m_system_msg(0), m_replace_msg(0)
{
m_mode = "new";
m_pdu = (char*)malloc(max_pdu);
}
PDU::PDU(const char *pdu) :
m_pdu(NULL), m_pdu_ptr(NULL), m_message(NULL), m_message_len(-1),
m_smsc(NULL), m_number(NULL), m_number_type(NULL), m_number_fmt(NF_UNKNOWN),
m_date(NULL), m_time(NULL), m_udh_type(NULL), m_udh_data(NULL), m_err(NULL),
m_with_udh(false), m_report(false), m_is_statusreport(false), m_replace(0),
m_alphabet(-1), m_flash(false), m_mode(NULL), m_validity(170),
m_system_msg(0), m_replace_msg(0)
{
if (pdu)
{
m_pdu = strdup(pdu);
m_pdu_ptr = m_pdu;
m_err = (char*)malloc(max_err);
m_err[0] = '\0';
}
}
PDU::~PDU()
{
if (m_pdu)
free(m_pdu);
if (m_number)
free(m_number);
if (m_number_type)
free(m_number_type);
if (m_smsc)
free(m_smsc);
if (m_message)
free(m_message);
m_message = 0;
if (m_date)
free(m_date);
if (m_time)
free(m_time);
if (m_udh_type)
free(m_udh_type);
if (m_udh_data)
free(m_udh_data);
if (m_err)
free(m_err);
}
// Utility methods
void PDU::reset()
{
if (m_number)
free(m_number);
m_number = (char*)malloc(max_number);
m_number[0] = '\0';
if (m_number_type)
free(m_number_type);
m_number_type = (char*)malloc(max_number_type);
m_number_type[0] = '\0';
if (m_smsc)
free(m_smsc);
m_smsc = (char*)malloc(max_smsc);
m_smsc[0] = '\0';
if (m_message)
free(m_message);
m_message = (char*)malloc(max_message);
m_message[0] = '\0';
m_message_len = 0;
if (m_date)
free(m_date);
m_date = (char*)malloc(max_date);
m_date[0] = '\0';
if (m_time)
free(m_time);
m_time = (char*)malloc(max_time);
m_time[0] = '\0';
if (m_udh_type)
free(m_udh_type);
m_udh_type = (char*)malloc(max_udh_type);
m_udh_type[0] = '\0';
if (m_udh_data)
free(m_udh_data);
m_udh_data = (char*)malloc(max_udh_data);
m_udh_data[0] = '\0';
if (!m_err)
m_err = (char*)malloc(max_err);
m_err[0] = '\0';
m_with_udh = false;
m_report = false;
m_is_statusreport = false;
}
int PDU::convert(const char *tocode, const char *fromcode)
{
iconv_t cd = iconv_open(tocode, fromcode);
if (cd == (iconv_t)(-1) || !m_message)
return -1;
size_t inbytesleft = m_message_len;
size_t outbytesleft = max_message;
char *tmp = (char*)malloc(outbytesleft);
char *msg = m_message;
char *out = tmp;
memset(tmp, 0, outbytesleft);
iconv(cd, &msg, &inbytesleft, &out, &outbytesleft);
if (m_message)
free(m_message);
m_message = tmp;
fprintf(stderr, "cc %s\n",m_message);
iconv_close(cd);
m_message_len = max_message - outbytesleft;
return m_message_len;
}
// Parsing
bool PDU::parse()
{
if (!m_pdu)
{
sprintf(m_err, "PDU is NULL");
return false;
}
// Patch for Wavecom SR memory reading:
if (strncmp(m_pdu, "000000FF00", 10) == 0)
{
m_pdu[8] = '\0';
while (strlen(m_pdu) < 52)
strcat(m_pdu, "00");
}
// ------------------------------------
reset();
if (strlen(m_pdu) < 2)
{
sprintf(m_err, "PDU is too short");
return false;
}
if (!parseSMSC())
return false;
if (strlen(m_pdu_ptr) < 2)
{
sprintf(m_err, "Reading First octet of the SMS-DELIVER PDU: PDU is too short");
return false;
}
int tmp;
if ((tmp = octet2bin_check(m_pdu_ptr)) < 0)
{
sprintf(m_err, "Reading First octet of the SMS-DELIVER PDU: Invalid character(s)");
return false;
}
// Unused bits 3 and 4 should be zero, failure with this produces a warning:
if (tmp & 0x18)
sprintf(m_err, "Warning: Unused bits 3 and 4 are used in the first octet of the SMS-DELIVER PDU.\n");
if (tmp & 0x40) // Is UDH bit set?
m_with_udh = true;
if (tmp & 0x20) // Is status report going to be returned to the SME?
m_report = true;
int type = tmp & 3;
if (type == 0) // SMS Deliver
{
m_pdu_ptr += 2;
if (!parseDeliver())
return false;
if (m_alphabet == 2)
convert("UTF8", "UTF16BE");
}
else if (type == 2) // Status Report
{
m_pdu_ptr += 2;
if(!parseStatusReport())
return false;
m_is_statusreport = true;
}
else if (type == 1) // Sent message
{
sprintf(m_err, "This is a sent message. Can only decode received messages.");
return false;
}
else
{
sprintf(m_err, "Unsupported type");
return false;
}
return true;
}
bool PDU::parseSMSC()
{
int length;
if ((length = octet2bin_check(m_pdu_ptr)) < 0)
{
sprintf(m_err, "Invalid character(s) in first octet");
return false;
}
if (length == 0)
{
m_pdu_ptr += 2;
return true;
}
if (length < 2 || length > max_smsc)
{
sprintf(m_err, "Invalid sender SMSC address length");
return false;
}
length = length * 2 - 2;
// No padding because the given value is number of octets.
if (strlen(m_pdu) < (size_t)(length + 4))
{
sprintf(m_err, "Reading SMSC address: PDU is too short");
return false;
}
m_pdu_ptr += 2;
// Read SMSC address type
int addr_type = octet2bin_check(m_pdu_ptr);
if (addr_type < 0)
{
sprintf(m_err, "Invalid sender SMSC address type");
return false;
}
if (addr_type < 0x80)
{
sprintf(m_err, "Missing bit 7 in sender SMSC address type");
return false;
}
// Read SMSC address
m_pdu_ptr += 2;
strncpy(m_smsc, m_pdu_ptr, (size_t)length);
m_smsc[length] = '\0';
swapchars(m_smsc);
// Does any SMSC use alphanumeric number?
if ((addr_type & 112) == 80)
{
// There can be only hex digits from the original PDU.
// The number itself is wrong in this case.
for (size_t i = 0; i < (size_t)length; i++)
{
if (!isxdigit(m_smsc[i]))
{
sprintf(m_err, "Invalid character(s) in alphanumeric SMSC address");
return false;
}
}
}
else
{
// Last character is allowed as F (and dropped) but all other non-numeric will produce an error:
if (m_smsc[length - 1] == 'F')
m_smsc[length - 1] = '\0';
for (size_t i = 0; i < strlen(m_smsc); i++)
{
if (!isdigit(m_smsc[i]))
{
sprintf(m_err, "Invalid character(s) in numeric SMSC address");
return false;
}
}
}
m_pdu_ptr += length;
return true;
}
int PDU::explainAddressType(const char *octet_char, int octet_int)
{
int result;
const char *p = "reserved";
if (octet_char)
result = octet2bin_check(octet_char);
else
result = octet_int;
if (result != -1)
{
switch ((result & 0x70) >> 4)
{
case 0: p = "unknown"; break;
case 1: p = "international"; break;
case 2: p = "national"; break;
case 3: p = "network specific"; break;
case 4: p = "subsciber"; break;
case 5: p = "alphanumeric"; break;
case 6: p = "abbreviated"; break;
}
sprintf(m_number_type, "%s", p);
switch (result & 0x0F)
{
case 0: p = "unknown"; break;
case 1: p = "ISDN/telephone"; break;
case 3: p = "data"; break;
case 4: p = "telex"; break;
case 8: p = "national"; break;
case 9: p = "private"; break;
case 10: p = "ERMES"; break;
}
strcat(m_number_type, ", ");
strcat(m_number_type, p);
}
return result;
}
bool PDU::parseDeliver()
{
if (strlen(m_pdu_ptr) < 4)
{
sprintf(m_err, "Reading address length and address type: PDU is too short");
return false;
}
int padding = 0;
int length = octet2bin_check(m_pdu_ptr);
if (length < 0 || length > max_number)
{
sprintf(m_err, "Invalid sender address length");
return false;
}
if (length == 0)
m_pdu_ptr += 4;
else
{
padding = length % 2;
m_pdu_ptr += 2;
int addr_type = explainAddressType(m_pdu_ptr, 0);
if (addr_type < 0)
{
sprintf(m_err, "Invalid sender address type");
return false;
}
if (addr_type < 0x80)
{
sprintf(m_err, "Missing bit 7 in sender address type");
return false;
}
m_pdu_ptr += 2;
if ((addr_type & 112) == 80) // Sender is alphanumeric
{
if (strlen(m_pdu_ptr) < (size_t)(length + padding))
{
sprintf(m_err, "Reading sender address (alphanumeric): PDU is too short");
return false;
}
char tmpsender[100];
char sender[100];
snprintf(tmpsender, length + padding + 3, "%02X%s", length * 4 / 7, m_pdu_ptr);
if (pdu2text0(tmpsender, sender) < 0)
{
sprintf(m_err, "Reading alphanumeric sender address: Invalid character(s)");
return false;
}
strcpy(m_number, sender);
}
else // Sender is numeric
{
strncpy(m_number, m_pdu_ptr, length + padding);
m_number[length + padding] = '\0';
swapchars(m_number);
int end = length + padding - 1;
if (padding)
{
if (m_number[end] != 'F')
sprintf(m_err, "Length of numeric sender address is odd, but not terminated with 'F'.\n");