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1 office 1 /* **************************************************************************
2  
3 This program creates a modified 16bit checksum used for the Netgear
4 DGN3500 series routers. The difference between this and a standard
5 checksum is that every 0x100 bytes added 0x100 have to be subtracted
6 from the sum.
7  
8 (C) 2013 Marco Antonio Mauro <marcus90 at gmail.com>
9  
10 Based on previous unattributed work.
11  
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
16  
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 General Public License for more details.
21  
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25  
26 ************************************************************************* */
27  
28  
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <sys/stat.h>
33  
34 unsigned char PidDataWW[70] =
35 {
36 0x73, 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D, 0x00, 0x00, 0x00, 0x00, 0x59, 0x50, 0x35, 0x37, 0x32,
37 0x33, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
38 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x41, 0x00, 0x37,
39 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73,
40 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D,
41 } ;
42  
43 unsigned char PidDataDE[70] =
44 {
45 0x73, 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D, 0x00, 0x00, 0x00, 0x00, 0x59, 0x50, 0x35, 0x37, 0x32,
46 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0x00, 0x37,
48 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73,
49 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D,
50 } ;
51  
52 unsigned char PidDataNA[70] =
53 {
54 0x73, 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D, 0x00, 0x00, 0x00, 0x00, 0x59, 0x50, 0x35, 0x37, 0x32,
55 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x41, 0x00, 0x37,
57 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73,
58 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D,
59 } ;
60  
61 /* *******************************************************************
62 Reads the file into memory and returns pointer to the buffer. */
63 static char *readfile(char *filename, int *size)
64 {
65 FILE *fp;
66 char *buffer;
67 struct stat info;
68  
69 if (stat(filename,&info)!=0)
70 return NULL;
71  
72 if ((fp=fopen(filename,"r"))==NULL)
73 return NULL;
74  
75 buffer=NULL;
76 for (;;)
77 {
78 if ((buffer=(char *)malloc(info.st_size+1))==NULL)
79 break;
80  
81 if (fread(buffer,1,info.st_size,fp)!=info.st_size)
82 {
83 free(buffer);
84 buffer=NULL;
85 break;
86 }
87  
88 buffer[info.st_size]='\0';
89 if(size) *size = info.st_size;
90  
91 break;
92 }
93  
94 (void)fclose(fp);
95  
96 return buffer;
97 }
98  
99  
100 /* ******************************************************************* */
101 int main(int argc, char** argv)
102 {
103 unsigned long start, i;
104 char *endptr, *buffer, *p;
105 int count; // size of file in bytes
106 unsigned short sum = 0, sum1 = 0;
107 char sumbuf[9];
108  
109 if(argc < 3) {
110 printf("ERROR: Argument missing!\n\nUsage %s filename starting offset in hex [PID code]\n\n", argv[0]);
111 return 1;
112 }
113  
114  
115 FILE *fp = fopen(argv[1], "a");
116 if(!fp) {
117 printf("ERROR: File not writeable!\n");
118 return 1;
119 }
120 if(argc == 4)
121 {
122 printf("%s: PID type: %s\n", argv[0], argv[3]);
123 if(strcmp(argv[3], "DE")==0)
124 fwrite(PidDataDE, sizeof(PidDataDE), sizeof(char), fp); /* write DE pid */
125 else if(strcmp(argv[3], "NA")==0)
126 fwrite(PidDataNA, sizeof(PidDataNA), sizeof(char), fp); /* write NA pid */
127 else /* if(strcmp(argv[3], "WW")) */
128 fwrite(PidDataWW, sizeof(PidDataWW), sizeof(char), fp); /* write WW pid */
129 }
130 else
131 fwrite(PidDataWW, sizeof(PidDataWW), sizeof(char), fp); /* write WW pid if unspecified */
132  
133 fclose(fp);
134  
135 /* Read the file to calculate the checksums */
136 buffer = readfile(argv[1], &count);
137 if(!buffer) {
138 printf("ERROR: File %s not found!\n", argv[1]);
139 return 1;
140 }
141  
142 p = buffer;
143 for(i = 0; i < count; i++)
144 {
145 sum += p[i];
146 }
147  
148 start = strtol(argv[2], &endptr, 16);
149 p = buffer+start;
150 for(i = 0; i < count - start; i++)
151 {
152 sum1 += p[i];
153 }
154  
155 sprintf(sumbuf,"%04X%04X",sum1,sum);
156 /* Append the 2 checksums to end of file */
157 fp = fopen(argv[1], "a");
158 if(!fp) {
159 printf("ERROR: File not writeable!\n");
160 return 1;
161 }
162 fwrite(sumbuf, 8, sizeof(char), fp);
163 fclose(fp);
164 free(buffer);
165 return 0;
166 }