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authorJames <>2015-11-04 11:49:21 +0000
committerJames <>2015-11-04 11:49:21 +0000
commit716ca530e1c4515d8683c9d5be3d56b301758b66 (patch)
tree700eb5bcc1a462a5f21dcec15ce7c97ecfefa772 /tools/firmware-utils/src/dgn3500sum.c
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Diffstat (limited to 'tools/firmware-utils/src/dgn3500sum.c')
-rw-r--r--tools/firmware-utils/src/dgn3500sum.c167
1 files changed, 167 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/dgn3500sum.c b/tools/firmware-utils/src/dgn3500sum.c
new file mode 100644
index 0000000..00a0c5f
--- /dev/null
+++ b/tools/firmware-utils/src/dgn3500sum.c
@@ -0,0 +1,167 @@
+/* **************************************************************************
+
+ This program creates a modified 16bit checksum used for the Netgear
+ DGN3500 series routers. The difference between this and a standard
+ checksum is that every 0x100 bytes added 0x100 have to be subtracted
+ from the sum.
+
+ (C) 2013 Marco Antonio Mauro <marcus90 at gmail.com>
+
+ Based on previous unattributed work.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ ************************************************************************* */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+unsigned char PidDataWW[70] =
+{
+ 0x73, 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D, 0x00, 0x00, 0x00, 0x00, 0x59, 0x50, 0x35, 0x37, 0x32,
+ 0x33, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x41, 0x00, 0x37,
+ 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73,
+ 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D,
+} ;
+
+unsigned char PidDataDE[70] =
+{
+ 0x73, 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D, 0x00, 0x00, 0x00, 0x00, 0x59, 0x50, 0x35, 0x37, 0x32,
+ 0x34, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0x00, 0x37,
+ 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73,
+ 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D,
+} ;
+
+unsigned char PidDataNA[70] =
+{
+ 0x73, 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D, 0x00, 0x00, 0x00, 0x00, 0x59, 0x50, 0x35, 0x37, 0x32,
+ 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x41, 0x00, 0x37,
+ 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x00, 0x00, 0x73,
+ 0x45, 0x72, 0x43, 0x6F, 0x4D, 0x6D,
+} ;
+
+/* *******************************************************************
+ Reads the file into memory and returns pointer to the buffer. */
+static char *readfile(char *filename, int *size)
+{
+ FILE *fp;
+ char *buffer;
+ struct stat info;
+
+ if (stat(filename,&info)!=0)
+ return NULL;
+
+ if ((fp=fopen(filename,"r"))==NULL)
+ return NULL;
+
+ buffer=NULL;
+ for (;;)
+ {
+ if ((buffer=(char *)malloc(info.st_size+1))==NULL)
+ break;
+
+ if (fread(buffer,1,info.st_size,fp)!=info.st_size)
+ {
+ free(buffer);
+ buffer=NULL;
+ break;
+ }
+
+ buffer[info.st_size]='\0';
+ if(size) *size = info.st_size;
+
+ break;
+ }
+
+ (void)fclose(fp);
+
+ return buffer;
+}
+
+
+/* ******************************************************************* */
+int main(int argc, char** argv)
+{
+ unsigned long start, i;
+ char *endptr, *buffer, *p;
+ int count; // size of file in bytes
+ unsigned short sum, sum1;
+ char sumbuf[9];
+
+ if(argc < 3) {
+ printf("ERROR: Argument missing!\n\nUsage %s filename starting offset in hex [PID code]\n\n", argv[0]);
+ return 1;
+ }
+
+
+ FILE *fp = fopen(argv[1], "a");
+ if(!fp) {
+ printf("ERROR: File not writeable!\n");
+ return 1;
+ }
+ if(argc = 4)
+ {
+ printf("%s: PID type: %s\n", argv[0], argv[3]);
+ if(strcmp(argv[3], "DE")==0)
+ fwrite(PidDataDE, sizeof(PidDataDE), sizeof(char), fp); /* write DE pid */
+ else if(strcmp(argv[3], "NA")==0)
+ fwrite(PidDataNA, sizeof(PidDataNA), sizeof(char), fp); /* write NA pid */
+ else /* if(strcmp(argv[3], "WW")) */
+ fwrite(PidDataWW, sizeof(PidDataWW), sizeof(char), fp); /* write WW pid */
+ }
+ else
+ fwrite(PidDataWW, sizeof(PidDataWW), sizeof(char), fp); /* write WW pid if unspecified */
+
+ fclose(fp);
+
+ /* Read the file to calculate the checksums */
+ buffer = readfile(argv[1], &count);
+ if(!buffer) {
+ printf("ERROR: File %s not found!\n", argv[1]);
+ return 1;
+ }
+
+ p = buffer;
+ for(i = 0; i < count; i++)
+ {
+ sum += p[i];
+ }
+
+ start = strtol(argv[2], &endptr, 16);
+ p = buffer+start;
+ sum1 = 0;
+ for(i = 0; i < count - start; i++)
+ {
+ sum1 += p[i];
+ }
+
+ sprintf(sumbuf,"%04X%04X",sum1,sum);
+ /* Append the 2 checksums to end of file */
+ fp = fopen(argv[1], "a");
+ if(!fp) {
+ printf("ERROR: File not writeable!\n");
+ return 1;
+ }
+ fwrite(sumbuf, 8, sizeof(char), fp);
+ fclose(fp);
+ free(buffer);
+ return 0;
+}