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"


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();
        }


        SMS ParseSmsPdu(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++);

                int shift_start = 0;
                if (UDHI)
                {
                        int udh_len = (*it++); 
                        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
                }


                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);
                
                SMS result;
                result.SetMessage(message);
                result.SetSender(sender);

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