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"


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

                return result;
        }

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