reactos/freeldr/ntvdmpat.c

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/* Copyright (C) 2000 CW Sandmann (sandmann@clio.rice.edu) 1206 Braelinn, Sugar Land, TX 77479 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#ifdef GO32
#include <unistd.h>
#else
#include <io.h>
#endif
char view_only = 0;
const char *client_patch_code;
char buffer[20480];
unsigned long search_base = 0x4c800L;
int f;
char oldpatch[] = {0x3b, 0x05, 0xac, 0xe6 };
char newpatch[] = {0x3b, 0x05, 0x58, 0x5e };
void patch_image(char *filename)
{
int i,size;
view_only = 0;
f = open(filename, O_RDWR | O_BINARY);
if (f < 0) {
f = open(filename, O_RDONLY | O_BINARY);
if (f < 0) {
perror(filename);
return;
}
view_only = 1;
}
lseek(f, search_base, SEEK_SET);
size = read(f, buffer, sizeof(buffer));
client_patch_code = NULL;
for(i=0; i<size && !client_patch_code; i++)
if(!memcmp(buffer+i,oldpatch,sizeof(oldpatch)))
client_patch_code = (buffer+i);
if(!client_patch_code) {
printf("Old patch string not found in %s!\n",filename);
} else {
lseek(f, search_base+i-1, SEEK_SET); /* Ready to update */
if(!view_only) {
write(f, newpatch, sizeof(newpatch));
printf("%s patched\n",filename);
} else
printf("%s patchable (not changed, readonly)\n",filename);
}
close(f);
return;
}
int main(int argc, char **argv)
{
int i;
char filename[256];
char buf1[256];
char file2[256];
if (argc != 1) { /* If they specify names, patch them, exit */
for(i=1; i<argc; i++)
patch_image(argv[i]);
return 0;
}
fprintf(stderr, "This image patches Windows 2000 NTVDM to fix nesting DPMI bug.\n");
strcpy(filename,getenv("SYSTEMROOT"));
strcpy(file2,filename);
strcat(filename,"\\system32\\ntvdm.exe");
strcat(file2,"\\system32\\dllcache\\ntvdm.exe");
sprintf(buf1,"copy %s %s\\system32\\ntvdm.ori",filename,getenv("SYSTEMROOT"));
printf("%s\n",buf1);
system(buf1);
patch_image(file2);
patch_image(filename);
return 0;
}