projects/smsdaemon/SmsPdu.cpp

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


#include "SmsPdu.h"

#include <string>
#include <sstream>

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

#include "common.h"
#include "util.h"

#include <iostream>

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;

                srand(time(0));
                unsigned char csms_ref = rand() % 128;

                int part_count;

                const int PDU_LEN = 153;

                if (multipart)
                {
                        if (message.length() > 800)
                        {
                                Common::instance()->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);

                                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
                                        Common::instance()->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();
        }


        SMS ParseSmsPdu(std::string pdu_str)
        {
                SMS result;

                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

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

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

                result.timestamp = DecodeTimestamp(it, it+7);
                it += 7;


                unsigned char data_len = (*it++);

                int shift_start = 0;
                if (UDHI)
                {
                        int udh_len = (*it++); 
                        cout << "UDH_LEN:" << udh_len << endl;
                        it += udh_len; //just ignore the User Data Header
                        data_len -= udh_len;

                        shift_start = udh_len+1; //make the 8to7bit decode start with the right shift level
                }
                cout << hex<< (int)(*it) << endl;;


                vector<unsigned char> user_data;
                user_data.insert(user_data.end(), it, it+data_len);
                
                result.message = Decode8to7bit(user_data, shift_start);
                

                return result;
        }

}
1	torben	59	/* using http://sourceforge.net/projects/libserial/
2			*/
3
4
5	torben	60	#include "SmsPdu.h"
6
7	torben	59	#include <string>
8			#include <sstream>
9
10	torben	60	#include <time.h>
11			#include <stdlib.h>
12	torben	59
13	torben	63	#include "common.h"
14	torben	59	#include "util.h"
15
16	torben	69	#include <iostream>
17	torben	59
18			using namespace std;
19
20
21			namespace SmsPdu
22			{
23
24
25	torben	68
26	torben	69	string SwitchChars(string input)
27	torben	59	{
28	torben	69	for (unsigned int i=1; i<input.length(); i+=2)
29			{
30			char tmp = input[i];
31			input[i] = input[i-1];
32			input[i-1] = tmp;
33			}
34			return input;
35	torben	59	}
36
37	torben	69	string EncodePhonenr(string input)
38			{
39	torben	73	if ( input.at(0) == '+' )
40			input.erase(0,1);
41
42	torben	69	if ( (input.length() % 2) == 1)
43			input.append("F");
44			return SwitchChars(input);
45			}
46	torben	61
47	torben	69	string DecodePhonenr(string input)
48			{
49			input = SwitchChars(input);
50			int last = input.length() -1;
51	torben	68
52	torben	69	if (input.at(last) == 'F')
53			input.erase(last,1);
54			return input;
55			}
56	torben	59
57	torben	68
58
59
60	torben	69	string HexformatVector(vector<unsigned char> vec)
61	torben	59	{
62	torben	69	ostringstream os;
63	torben	59
64	torben	69	for (unsigned int i=0; i<vec.size(); ++i)
65			{
66			os.width(2);
67			os.fill('0');
68			os << hex << uppercase << static_cast<unsigned int>(vec.at(i));
69			}
70	torben	59
71
72	torben	69	return os.str();
73			}
74	torben	61
75	torben	69	vector<unsigned char> HexDecodeString(string str)
76	torben	68	{
77	torben	69	vector<unsigned char> vec;
78			for (unsigned int i=0; i<str.length(); i+=2)
79			vec.push_back( strtol( str.substr(i,2).c_str(), 0, 16 ));
80	torben	68
81	torben	69	return vec;
82			}
83	torben	68
84	torben	73	std::string Decode8to7bit(vector<unsigned char> input, int shift_start)
85	torben	69	{
86			string result;
87	torben	68
88	torben	70	int shift = shift_start;
89	torben	69	for (unsigned int i=0; i<input.size(); ++i)
90			{
91			unsigned char current = input.at(i);
92			unsigned char prev = (i>0) ? input.at(i-1) : 0;
93	torben	68
94	torben	69	current <<= shift;
95	torben	68
96	torben	69	prev >>= (8-shift);
97	torben	68
98	torben	69	unsigned char byte = current \| prev;
99			byte &= 0x7F;
100	torben	68
101	torben	69	result.append(1, byte);
102	torben	68
103	torben	69	if (shift == 6)
104			result.append(1, input.at(i) >> 1);
105	torben	61
106	torben	69	shift = (shift+1) % 7;
107	torben	68
108	torben	69	}
109	torben	68
110	torben	69	return result;
111			}
112	torben	68
113	torben	59
114	torben	69
115
116	torben	73	vector<unsigned char> Encode7to8bit(std::string str, int shift_start)
117	torben	59	{
118	torben	69	vector<unsigned char> buf;
119	torben	59
120	torben	73	int shift = shift_start;
121	torben	69	for (unsigned int i=0; i<str.size(); ++i)
122			{
123			unsigned char current = str.at(i) & 0x7F;
124			unsigned char next = ( (i+1)<str.size()) ? str.at(i+1) : 0;
125			next &= 0x7F;
126	torben	59
127	torben	69	current >>= shift;
128			next <<= (7-shift);
129	torben	59
130	torben	69	unsigned char byte = current \| next;
131			buf.push_back(byte);
132	torben	59
133	torben	69	if (shift == 6)
134			i++;
135	torben	59
136	torben	69	shift = (shift+1) % 7;
137
138			}
139
140			return buf;
141	torben	59	}
142
143	torben	69	vector<PduInfo> CreateSmsPdu(string to, string message, bool allowMultipart)
144			{
145			bool multipart = allowMultipart && message.length() > 160;
146	torben	59
147	torben	69	const unsigned char UDHI = multipart ? 0x40 : 0;
148	torben	59
149	torben	69	srand(time(0));
150			unsigned char csms_ref = rand() % 128;
151	torben	59
152	torben	69	int part_count;
153	torben	59
154	torben	69	const int PDU_LEN = 153;
155	torben	61
156	torben	69	if (multipart)
157			{
158			if (message.length() > 800)
159			{
160			Common::instance()->logMessage("Trying to send multipart sms > 800 bytes !!!");
161			message = message.substr(0,800);
162			}
163	torben	61
164	torben	69	part_count = message.length() / PDU_LEN;
165			if (message.length() % PDU_LEN)
166			part_count++;
167			}
168			else
169	torben	65	{
170	torben	69	part_count = 1;
171	torben	65	}
172
173	torben	69	vector<PduInfo> result;
174			for (int partnr = 0; partnr < part_count; ++partnr)
175			{
176			vector<unsigned char> pdu;
177	torben	59
178	torben	69	pdu.push_back(0x00); // use SMSC from phone
179			pdu.push_back( 0x01\|UDHI ); // first octet -- no timeout
180			pdu.push_back(0x00); // TP-MR message reference
181			pdu.push_back(to.length() ); //length of phone nr
182			pdu.push_back(0x81); // type of address (international nr + ISDN/telephone range) - else try 0x81
183	torben	59
184	torben	73
185			vector<unsigned char> phone = HexDecodeString( EncodePhonenr(to ));
186	torben	69	pdu.insert( pdu.end(), phone.begin(), phone.end());
187	torben	60
188	torben	69	pdu.push_back(0x00); // Protocol identifier
189			pdu.push_back(0x00); // Data coding scheme
190	torben	60
191	torben	73	int shift_start = 0;
192	torben	69	string message_part;
193			if (multipart)
194			{
195			message_part = message.substr(0, PDU_LEN);
196			message.erase(0, PDU_LEN);
197	torben	60
198	torben	69	pdu.push_back( message_part.length()+ 7 ); //UserDataLength
199			pdu.push_back( 0x06 ); // UDH Len
200			pdu.push_back( 0x00 ); // UDH Element Identifier
201			pdu.push_back( 0x03 ); // UDH element length
202			pdu.push_back( csms_ref ); // csms_ref reference
203			pdu.push_back( part_count );
204			pdu.push_back( partnr+1 );
205			pdu.push_back( 0x00);
206	torben	73	//shift_start = 6;
207	torben	63	}
208			else
209			{
210	torben	69	if (message.length() > 160)
211			{
212			message_part = message.substr(0,160); //truncate to 160
213			Common::instance()->logMessage("Truncated message");
214			}
215			else
216			{
217			message_part = message;
218			}
219
220			pdu.push_back( message_part.length() ); //UserDataLength
221	torben	63	}
222	torben	60
223	torben	73	vector<unsigned char> userData = Encode7to8bit(message_part, shift_start);
224	torben	69
225			pdu.insert( pdu.end(), userData.begin(), userData.end());
226
227			PduInfo info;
228			info.len = pdu.size()-1;
229			info.pdu = HexformatVector(pdu);
230			result.push_back(info);
231
232	torben	60	}
233	torben	69	return result;
234			}
235	torben	60
236	torben	69	typedef vector<unsigned char>::iterator char_it;
237	torben	60
238	torben	69	string DecodeRawPhonenr(char_it start, char_it end)
239			{
240			ostringstream os;
241	torben	60
242	torben	69	for (char_it it = start; it != end; ++it)
243			{
244			os.width(2);
245			os.fill('0');
246			os << hex << (int)(*it);
247			}
248			return DecodePhonenr(os.str());
249			}
250	torben	60
251	torben	69	string DecodeTimestamp(char_it start, char_it end)
252			{
253			string stamp = DecodeRawPhonenr(start,end);
254
255			ostringstream os;
256
257			os << stamp.substr(0,2) << "/"; //year
258			os << stamp.substr(2,2) << "/"; //month
259			os << stamp.substr(4,2) << ","; //day
260			os << stamp.substr(6,2) << ":"; //hour
261			os << stamp.substr(8,2) << ":"; //minute
262			os << stamp.substr(10,2) ; //second
263
264			int timezone = strtol(stamp.substr(12,2).c_str(), 0, 16);
265
266
267			if (timezone > 127)
268			os << "-";
269			else
270			os << "+";
271
272			os.width(2);
273			os.fill('0');
274			os << (timezone & 0x7F);
275
276			return os.str();
277	torben	60	}
278	torben	59
279	torben	69
280			SMS ParseSmsPdu(std::string pdu_str)
281			{
282			SMS result;
283
284			vector<unsigned char> pdu = HexDecodeString(pdu_str);
285
286			vector<unsigned char>::iterator it = pdu.begin();
287
288			it += (*it++); // Skip smsc info
289
290			unsigned char deliver_first_octet = (*it++);
291	torben	70
292			bool UDHI = (deliver_first_octet & 0x40) > 0;
293
294	torben	69	unsigned char sender_len = (*it++);
295			if ( (sender_len % 2) == 1)
296			sender_len++;
297
298			++it; //ignore Type-Of-Address
299
300			result.sender = DecodeRawPhonenr( it, it+(sender_len/2) );
301
302			it += (sender_len/2);
303			++it; //protocol identifier
304			++it; //Data encoding
305
306			result.timestamp = DecodeTimestamp(it, it+7);
307			it += 7;
308
309	torben	70
310	torben	69	unsigned char data_len = (*it++);
311
312	torben	70	int shift_start = 0;
313			if (UDHI)
314			{
315			int udh_len = (*it++);
316			cout << "UDH_LEN:" << udh_len << endl;
317			it += udh_len; //just ignore the User Data Header
318			data_len -= udh_len;
319
320			shift_start = udh_len+1; //make the 8to7bit decode start with the right shift level
321			}
322			cout << hex<< (int)(*it) << endl;;
323
324
325	torben	69	vector<unsigned char> user_data;
326			user_data.insert(user_data.end(), it, it+data_len);
327
328	torben	70	result.message = Decode8to7bit(user_data, shift_start);
329	torben	69
330
331			return result;
332			}
333
334	torben	59	}