projects/smsdaemon/SmsPdu.cpp

/* using http://sourceforge.net/projects/libserial/
 */


#include "SmsPdu.h"

#include <string>
#include <sstream>

#include <time.h>
#include <stdlib.h>

#include "Logger.h"
#include "Util.h"

#include "Exceptions.h"
#include <list>
#include <vector>
#include <algorithm>


using namespace std;

namespace SmsPdu
{


        string SwitchChars(string input)
        {
                for (unsigned int i=1; i<input.length(); i+=2)
                {
                        char tmp = input[i];
                        input[i] = input[i-1];
                        input[i-1] = tmp;
                }
                return input;
        }

        string EncodePhonenr(string input)
        {
                if ( input.at(0) == '+' )
                        input.erase(0,1);

                if ( (input.length() % 2) == 1)
                        input.append("F");
                return SwitchChars(input);
        }

        string DecodePhonenr(string input)
        {
                input = SwitchChars(input);
                int last = input.length() -1;

                if (input.at(last) == 'F')
                        input.erase(last,1);
                return input;
        }


        string HexformatVector(vector<unsigned char> vec)
        {
                ostringstream os;

                for (unsigned int i=0; i<vec.size(); ++i)
                {
                        os.width(2);
                        os.fill('0');
                        os << hex << uppercase << static_cast<unsigned int>(vec.at(i));
                }


                return os.str();
        }

        vector<unsigned char> HexDecodeString(string str)
        {
                vector<unsigned char> vec;
                for (unsigned int i=0; i<str.length(); i+=2)
                        vec.push_back( strtol( str.substr(i,2).c_str(), 0, 16 ));

                return vec;
        }

        std::string Decode8to7bit(vector<unsigned char> input, int shift_start)
        {
                string result;

                int shift = shift_start;
                for (unsigned int i=0; i<input.size(); ++i)
                {
                        unsigned char current = input.at(i);
                        unsigned char prev = (i>0) ? input.at(i-1) : 0;

                        current <<= shift;

                        prev >>= (8-shift);

                        unsigned char byte = current | prev;
                        byte &= 0x7F;

                        result.append(1, byte);

                        if (shift == 6)
                                result.append(1, input.at(i) >> 1);

                        shift = (shift+1) % 7;

                }

                return result;
        }


        vector<unsigned char> Encode7to8bit(std::string str, int shift_start)
        {
                vector<unsigned char> buf;

                int shift = shift_start;
                for (unsigned int i=0; i<str.size(); ++i)
                {
                        unsigned char current = str.at(i) & 0x7F;
                        unsigned char next = ( (i+1)<str.size()) ? str.at(i+1) : 0;
                        next &= 0x7F;

                        current >>= shift;
                        next <<= (7-shift);

                        unsigned char byte = current | next;
                        buf.push_back(byte);

                        if (shift == 6)
                                i++;

                        shift = (shift+1) % 7;

                }

                return buf;
        }

        vector<PduInfo> CreateSmsPdu(string to, string message, bool allowMultipart)
        {
                bool multipart = allowMultipart && message.length() > 160;

                const unsigned char UDHI = multipart ? 0x40 : 0;

                unsigned char csms_ref = rand() % 128;

                int part_count;

                const int PDU_LEN = 153;

                if (multipart)
                {
                        if (message.length() > 800)
                        {
                                Logger::logMessage("Trying to send multipart sms > 800 bytes !!!");
                                message = message.substr(0,800);
                        }

                        part_count = message.length() / PDU_LEN;
                        if (message.length() % PDU_LEN)
                                part_count++;
                }
                else
                {
                        part_count = 1;
                }

                vector<PduInfo> result;
                for (int partnr = 0; partnr < part_count; ++partnr)
                {
                        vector<unsigned char> pdu;

                        pdu.push_back(0x00); // use SMSC from phone
                        pdu.push_back( 0x01|UDHI ); // first octet -- no timeout
                        pdu.push_back(0x00); // TP-MR message reference
                        pdu.push_back(to.length() ); //length of phone nr
                        pdu.push_back(0x81); // type of address (international nr  + ISDN/telephone range) - else try 0x81


                        vector<unsigned char> phone = HexDecodeString( EncodePhonenr(to ));
                        pdu.insert( pdu.end(), phone.begin(), phone.end());

                        pdu.push_back(0x00); // Protocol identifier
                        pdu.push_back(0x00); // Data coding scheme

                        int shift_start = 0;
                        string message_part;
                        if (multipart)
                        {
                                message_part = message.substr(0, PDU_LEN);
                                message.erase(0, PDU_LEN-1);

                                pdu.push_back( message_part.length()+ 7 );  //UserDataLength
                                pdu.push_back( 0x06 ); // UDH Len
                                pdu.push_back( 0x00 ); // UDH Element Identifier
                                pdu.push_back( 0x03 ); // UDH element length
                                pdu.push_back( csms_ref ); // csms_ref reference
                                pdu.push_back( part_count );
                                pdu.push_back( partnr+1 );
                                pdu.push_back( 0x00);
                                //shift_start = 6;
                        }
                        else
                        {
                                if (message.length() > 160)
                                {
                                        message_part = message.substr(0,160); //truncate to 160
                                        Logger::logMessage("Truncated message");
                                }
                                else
                                {
                                        message_part = message;
                                }

                                pdu.push_back( message_part.length() ); //UserDataLength
                        }

                        vector<unsigned char> userData = Encode7to8bit(message_part, shift_start);

                        pdu.insert( pdu.end(), userData.begin(), userData.end());

                        PduInfo info;
                        info.len = pdu.size()-1;
                        info.pdu = HexformatVector(pdu);
                        result.push_back(info);

                }
                return result;
        }

        typedef vector<unsigned char>::iterator char_it;

        string DecodeRawPhonenr(char_it start, char_it end)
        {
                ostringstream os;

                for (char_it it = start; it != end; ++it)
                {
                        os.width(2);
                        os.fill('0');
                        os << hex << (int)(*it);
                }
                return DecodePhonenr(os.str());
        }

        string DecodeTimestamp(char_it start, char_it end)
        {
                string stamp = DecodeRawPhonenr(start,end);

                ostringstream os;

                os << stamp.substr(0,2) << "/"; //year
                os << stamp.substr(2,2) << "/"; //month
                os << stamp.substr(4,2) << ","; //day
                os << stamp.substr(6,2) << ":"; //hour
                os << stamp.substr(8,2) << ":"; //minute
                os << stamp.substr(10,2) ; //second

                int timezone = strtol(stamp.substr(12,2).c_str(), 0, 16);


                if (timezone > 127)
                        os << "-";
                else
                        os << "+";

                os.width(2);
                os.fill('0');
                os << (timezone & 0x7F);

                return os.str();
        }


        std::list<SmsPart> partlist;
        typedef std::list<SmsPart>::iterator iterator;

        SMS ConcatenateParts(SmsPart& part)
        {
                SMS sms;
                if (part.group == -1)
                {
                        sms.SetMessage(part.message);
                        sms.SetSender(part.sender);
                }
                else
                {
                        partlist.push_back(part);

                        vector<SmsPart> vec;
                        for (iterator it=partlist.begin(); it!=partlist.end(); ++it)
                        {
                                SmsPart& current = *it;
                                if (current.sender == part.sender && current.group == part.group)
                                        vec.push_back(current);
                        }

                        if (vec.size() == (unsigned)part.count) //we have all parts
                        {
                                sort(vec.begin(), vec.end());
                                string message;
                                for (unsigned i=0; i<vec.size(); i++)
                                {
                                        partlist.remove( (vec[i]) );
                                        message += vec[i].message;
                                }
                                sms.SetSender(part.sender);
                                sms.SetMessage(message);
                        }
                        else
                        {
                                throw smsnotfoundexception(); // need more parts
                        }

                }

                return sms;
        }


        SMS ParseSmsPdu(std::string pdu_str)
        {
                SmsPart part = ParseSmsPduWorker(pdu_str);

                return ConcatenateParts(part);

        }

        void ParseUdh(vector<unsigned char>& udh, SmsPart& part)
        {
                if (udh.size() == 0)
                {
                        Logger::logMessage("ParseUdh(): empty udh");
                        return;
                }

                if (udh[0] != 0)
                {
                        Logger::logMessage("unknown UDH type");
                        return;
                }

                if (udh.size() < 5)
                {
                        Logger::logMessage("UDH to short to be multipart");
                        return;
                }

                part.group = udh[2];
                part.count = udh[3];
                part.id = udh[4];
        }


        SmsPart ParseSmsPduWorker(std::string pdu_str)
        {

                vector<unsigned char> pdu = HexDecodeString(pdu_str);

                vector<unsigned char>::iterator it = pdu.begin();

                it += (*it++); // Skip smsc info

                unsigned char deliver_first_octet = (*it++);

                bool UDHI = (deliver_first_octet & 0x40) > 0;

                unsigned char sender_len = (*it++);
                if ( (sender_len % 2) == 1)
                        sender_len++;

                ++it; //ignore Type-Of-Address

                string sender = DecodeRawPhonenr( it, it+(sender_len/2) );

                it += (sender_len/2);
                ++it; //protocol identifier
                ++it; //Data encoding

                string timestamp = DecodeTimestamp(it, it+7);
                it += 7;


                unsigned char data_len = (*it++);


                SmsPart part;
                part.group = -1;

                int shift_start = 0;

                if (UDHI)
                {
                        int udh_len = (*it++);

                        vector<unsigned char> udh;
                        for (int i=0; i<udh_len; i++)
                        {
                                udh.push_back (*it++);
                        }
                        ParseUdh(udh,part);

                        data_len -= udh_len;

                        shift_start = udh_len+1; //make the 8to7bit decode start with the right shift level
                }


                vector<unsigned char> user_data;
                user_data.insert(user_data.end(), it, it+data_len);

                string message = Decode8to7bit(user_data, shift_start).substr(0,data_len);

                message = Util::str_trim(message);


                part.message = message;
                part.sender = sender;

                return part;
        }

}
1	/* using http://sourceforge.net/projects/libserial/
2	*/
3
4
5	#include "SmsPdu.h"
6
7	#include <string>
8	#include <sstream>
9
10	#include <time.h>
11	#include <stdlib.h>
12
13	#include "Logger.h"
14	#include "Util.h"
15
16	#include "Exceptions.h"
17	#include <list>
18	#include <vector>
19	#include <algorithm>
20
21
22	using namespace std;
23
24	namespace SmsPdu
25	{
26
27
28
29	string SwitchChars(string input)
30	{
31	for (unsigned int i=1; i<input.length(); i+=2)
32	{
33	char tmp = input[i];
34	input[i] = input[i-1];
35	input[i-1] = tmp;
36	}
37	return input;
38	}
39
40	string EncodePhonenr(string input)
41	{
42	if ( input.at(0) == '+' )
43	input.erase(0,1);
44
45	if ( (input.length() % 2) == 1)
46	input.append("F");
47	return SwitchChars(input);
48	}
49
50	string DecodePhonenr(string input)
51	{
52	input = SwitchChars(input);
53	int last = input.length() -1;
54
55	if (input.at(last) == 'F')
56	input.erase(last,1);
57	return input;
58	}
59
60
61
62
63	string HexformatVector(vector<unsigned char> vec)
64	{
65	ostringstream os;
66
67	for (unsigned int i=0; i<vec.size(); ++i)
68	{
69	os.width(2);
70	os.fill('0');
71	os << hex << uppercase << static_cast<unsigned int>(vec.at(i));
72	}
73
74
75	return os.str();
76	}
77
78	vector<unsigned char> HexDecodeString(string str)
79	{
80	vector<unsigned char> vec;
81	for (unsigned int i=0; i<str.length(); i+=2)
82	vec.push_back( strtol( str.substr(i,2).c_str(), 0, 16 ));
83
84	return vec;
85	}
86
87	std::string Decode8to7bit(vector<unsigned char> input, int shift_start)
88	{
89	string result;
90
91	int shift = shift_start;
92	for (unsigned int i=0; i<input.size(); ++i)
93	{
94	unsigned char current = input.at(i);
95	unsigned char prev = (i>0) ? input.at(i-1) : 0;
96
97	current <<= shift;
98
99	prev >>= (8-shift);
100
101	unsigned char byte = current \| prev;
102	byte &= 0x7F;
103
104	result.append(1, byte);
105
106	if (shift == 6)
107	result.append(1, input.at(i) >> 1);
108
109	shift = (shift+1) % 7;
110
111	}
112
113	return result;
114	}
115
116
117
118
119	vector<unsigned char> Encode7to8bit(std::string str, int shift_start)
120	{
121	vector<unsigned char> buf;
122
123	int shift = shift_start;
124	for (unsigned int i=0; i<str.size(); ++i)
125	{
126	unsigned char current = str.at(i) & 0x7F;
127	unsigned char next = ( (i+1)<str.size()) ? str.at(i+1) : 0;
128	next &= 0x7F;
129
130	current >>= shift;
131	next <<= (7-shift);
132
133	unsigned char byte = current \| next;
134	buf.push_back(byte);
135
136	if (shift == 6)
137	i++;
138
139	shift = (shift+1) % 7;
140
141	}
142
143	return buf;
144	}
145
146	vector<PduInfo> CreateSmsPdu(string to, string message, bool allowMultipart)
147	{
148	bool multipart = allowMultipart && message.length() > 160;
149
150	const unsigned char UDHI = multipart ? 0x40 : 0;
151
152	unsigned char csms_ref = rand() % 128;
153
154	int part_count;
155
156	const int PDU_LEN = 153;
157
158	if (multipart)
159	{
160	if (message.length() > 800)
161	{
162	Logger::logMessage("Trying to send multipart sms > 800 bytes !!!");
163	message = message.substr(0,800);
164	}
165
166	part_count = message.length() / PDU_LEN;
167	if (message.length() % PDU_LEN)
168	part_count++;
169	}
170	else
171	{
172	part_count = 1;
173	}
174
175	vector<PduInfo> result;
176	for (int partnr = 0; partnr < part_count; ++partnr)
177	{
178	vector<unsigned char> pdu;
179
180	pdu.push_back(0x00); // use SMSC from phone
181	pdu.push_back( 0x01\|UDHI ); // first octet -- no timeout
182	pdu.push_back(0x00); // TP-MR message reference
183	pdu.push_back(to.length() ); //length of phone nr
184	pdu.push_back(0x81); // type of address (international nr + ISDN/telephone range) - else try 0x81
185
186
187	vector<unsigned char> phone = HexDecodeString( EncodePhonenr(to ));
188	pdu.insert( pdu.end(), phone.begin(), phone.end());
189
190	pdu.push_back(0x00); // Protocol identifier
191	pdu.push_back(0x00); // Data coding scheme
192
193	int shift_start = 0;
194	string message_part;
195	if (multipart)
196	{
197	message_part = message.substr(0, PDU_LEN);
198	message.erase(0, PDU_LEN-1);
199
200	pdu.push_back( message_part.length()+ 7 ); //UserDataLength
201	pdu.push_back( 0x06 ); // UDH Len
202	pdu.push_back( 0x00 ); // UDH Element Identifier
203	pdu.push_back( 0x03 ); // UDH element length
204	pdu.push_back( csms_ref ); // csms_ref reference
205	pdu.push_back( part_count );
206	pdu.push_back( partnr+1 );
207	pdu.push_back( 0x00);
208	//shift_start = 6;
209	}
210	else
211	{
212	if (message.length() > 160)
213	{
214	message_part = message.substr(0,160); //truncate to 160
215	Logger::logMessage("Truncated message");
216	}
217	else
218	{
219	message_part = message;
220	}
221
222	pdu.push_back( message_part.length() ); //UserDataLength
223	}
224
225	vector<unsigned char> userData = Encode7to8bit(message_part, shift_start);
226
227	pdu.insert( pdu.end(), userData.begin(), userData.end());
228
229	PduInfo info;
230	info.len = pdu.size()-1;
231	info.pdu = HexformatVector(pdu);
232	result.push_back(info);
233
234	}
235	return result;
236	}
237
238	typedef vector<unsigned char>::iterator char_it;
239
240	string DecodeRawPhonenr(char_it start, char_it end)
241	{
242	ostringstream os;
243
244	for (char_it it = start; it != end; ++it)
245	{
246	os.width(2);
247	os.fill('0');
248	os << hex << (int)(*it);
249	}
250	return DecodePhonenr(os.str());
251	}
252
253	string DecodeTimestamp(char_it start, char_it end)
254	{
255	string stamp = DecodeRawPhonenr(start,end);
256
257	ostringstream os;
258
259	os << stamp.substr(0,2) << "/"; //year
260	os << stamp.substr(2,2) << "/"; //month
261	os << stamp.substr(4,2) << ","; //day
262	os << stamp.substr(6,2) << ":"; //hour
263	os << stamp.substr(8,2) << ":"; //minute
264	os << stamp.substr(10,2) ; //second
265
266	int timezone = strtol(stamp.substr(12,2).c_str(), 0, 16);
267
268
269	if (timezone > 127)
270	os << "-";
271	else
272	os << "+";
273
274	os.width(2);
275	os.fill('0');
276	os << (timezone & 0x7F);
277
278	return os.str();
279	}
280
281
282	std::list<SmsPart> partlist;
283	typedef std::list<SmsPart>::iterator iterator;
284
285	SMS ConcatenateParts(SmsPart& part)
286	{
287	SMS sms;
288	if (part.group == -1)
289	{
290	sms.SetMessage(part.message);
291	sms.SetSender(part.sender);
292	}
293	else
294	{
295	partlist.push_back(part);
296
297	vector<SmsPart> vec;
298	for (iterator it=partlist.begin(); it!=partlist.end(); ++it)
299	{
300	SmsPart& current = *it;
301	if (current.sender == part.sender && current.group == part.group)
302	vec.push_back(current);
303	}
304
305	if (vec.size() == (unsigned)part.count) //we have all parts
306	{
307	sort(vec.begin(), vec.end());
308	string message;
309	for (unsigned i=0; i<vec.size(); i++)
310	{
311	partlist.remove( (vec[i]) );
312	message += vec[i].message;
313	}
314	sms.SetSender(part.sender);
315	sms.SetMessage(message);
316	}
317	else
318	{
319	throw smsnotfoundexception(); // need more parts
320	}
321
322	}
323
324	return sms;
325	}
326
327
328	SMS ParseSmsPdu(std::string pdu_str)
329	{
330	SmsPart part = ParseSmsPduWorker(pdu_str);
331
332	return ConcatenateParts(part);
333
334	}
335
336	void ParseUdh(vector<unsigned char>& udh, SmsPart& part)
337	{
338	if (udh.size() == 0)
339	{
340	Logger::logMessage("ParseUdh(): empty udh");
341	return;
342	}
343
344	if (udh[0] != 0)
345	{
346	Logger::logMessage("unknown UDH type");
347	return;
348	}
349
350	if (udh.size() < 5)
351	{
352	Logger::logMessage("UDH to short to be multipart");
353	return;
354	}
355
356	part.group = udh[2];
357	part.count = udh[3];
358	part.id = udh[4];
359	}
360
361
362	SmsPart ParseSmsPduWorker(std::string pdu_str)
363	{
364
365	vector<unsigned char> pdu = HexDecodeString(pdu_str);
366
367	vector<unsigned char>::iterator it = pdu.begin();
368
369	it += (*it++); // Skip smsc info
370
371	unsigned char deliver_first_octet = (*it++);
372
373	bool UDHI = (deliver_first_octet & 0x40) > 0;
374
375	unsigned char sender_len = (*it++);
376	if ( (sender_len % 2) == 1)
377	sender_len++;
378
379	++it; //ignore Type-Of-Address
380
381	string sender = DecodeRawPhonenr( it, it+(sender_len/2) );
382
383	it += (sender_len/2);
384	++it; //protocol identifier
385	++it; //Data encoding
386
387	string timestamp = DecodeTimestamp(it, it+7);
388	it += 7;
389
390
391	unsigned char data_len = (*it++);
392
393
394	SmsPart part;
395	part.group = -1;
396
397	int shift_start = 0;
398
399	if (UDHI)
400	{
401	int udh_len = (*it++);
402
403	vector<unsigned char> udh;
404	for (int i=0; i<udh_len; i++)
405	{
406	udh.push_back (*it++);
407	}
408	ParseUdh(udh,part);
409
410	data_len -= udh_len;
411
412	shift_start = udh_len+1; //make the 8to7bit decode start with the right shift level
413	}
414
415
416	vector<unsigned char> user_data;
417	user_data.insert(user_data.end(), it, it+data_len);
418
419	string message = Decode8to7bit(user_data, shift_start).substr(0,data_len);
420
421	message = Util::str_trim(message);
422
423
424	part.message = message;
425	part.sender = sender;
426
427	return part;
428	}
429
430	}