From 9c2baa5e85d1e11be3f46e8756259663d8e070e3 Mon Sep 17 00:00:00 2001
From: Michael Gebetsroither <michael.geb@gmx.at>
Date: Fri, 9 Mar 2007 17:56:20 +0100
Subject: [PATCH] vmware-detect.c: implemented io-ports based check

---
 compile/vmware-detect.c | 102 ++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 94 insertions(+), 8 deletions(-)

diff --git a/compile/vmware-detect.c b/compile/vmware-detect.c
index f3875a7..4914c8e 100644
--- a/compile/vmware-detect.c
+++ b/compile/vmware-detect.c
@@ -1,24 +1,110 @@
+#include "string.h"
+#include "unistd.h"
+#include "stdio.h"
+#include "stdlib.h"
+
+#define WRITE(x) write(1, x, strlen(x))
+#define DWRITE(x) do{ \
+    if(debug) { \
+        WRITE(x); \
+    } \
+} while(0);
+#define FALSE 0
+#define TRUE !FALSE
+
+// from libowfat {{{
+static inline char tohex(char c) {
+  return c>=10?c-10+'a':c+'0';
+}
+
+unsigned int fmt_xlong(char *dest,unsigned long i) {
+  register unsigned long len,tmp;
+  /* first count the number of bytes needed */
+  for (len=1, tmp=i; tmp>15; ++len) tmp>>=4;
+  if (dest)
+    for (tmp=i, dest+=len; ; ) {
+      *--dest = tohex(tmp&15);
+      if (!(tmp>>=4)) break;
+    }
+  return len;
+}
+// }}}
+
+void printIdtr(const unsigned char* idtr, unsigned size)
+{
+    unsigned i;
+    for(i=0; i<=size; ++i) {
+        char out[4] = {0};
+        fmt_xlong(out, idtr[i]);
+        WRITE(out);
+    }
+    WRITE("\n");
+}
+
 #if defined (__i386__)
-int checkVmware()
+int checkVmware(const int debug)
 {
-    unsigned char idtr[6];
+    unsigned char idtr[6] = {0};
     asm("sidt %0" : "=m" (idtr));
-    return (0xff==idtr[5]) ? 0 : 1;
+    if(debug)
+        printIdtr(idtr, 6);
+    return (0xff==idtr[5]) ? 1 : 0;
+}
+int checkVmwareIO()
+{
+    unsigned int vmaj, vmin, magic, dout;
+    __asm__ __volatile__(
+            "mov $0x564D5868, %%eax; /* magic number */"
+            "mov $0x3c6cf712, %%ebx; /* random number */"
+            "mov $0x0000000A, %%ecx; /* specifies command */"
+            "mov $0x5658, %%edx; /* VMware I/O port */"
+            "in %%dx, %%eax;"
+            "mov %%eax, %0;"
+            "mov %%ebx, %1;"
+            "mov %%ecx, %2;"
+            "mov %%edx, %3;"
+        : "=r"(vmaj), "=r"(magic), "=r"(vmin), "=r"(dout));
+    return (0x564D5868 == magic) ? 1 : 0;
 }
 #elif defined (__x86_64__)
 // only guessed, possible need to check against 0xffff?
-int checkVmware()
+int checkVmware(const int debug)
 {
     unsigned char idtr[10];
     asm("sidt %0" : "=m" (idtr));
-    return (0xff==idtr[9]) ? 0 : 1;
+    if(debug)
+        printIdtr(idtr, 10);
+    return (0xff==idtr[9]) ? 1 : 0;
 }
 #else
 // vmware runs only on the archs above
-int checkVmware() { return 1; }
+int checkVmware(const int) { return 0; }
 #endif
 
-int main() {
+int main(int argc, char* argv[]) {
+    int debug = FALSE;
+    if(argc == 2 && !strcmp(argv[1], "--debug"))
+        debug = TRUE;
+
     // returns 0 if running inside vmware, 1 otherwise
-    return checkVmware();
+    int a, b;
+    a = checkVmware(debug);
+    DWRITE("idt-check: ")
+    if(a) {
+        DWRITE("true\n");
+        return 0;
+    }
+    DWRITE("false\n");
+
+    // never returns if not running under vmware
+    void dummy() { DWRITE("false\n"); exit(1); }
+    signal(SIGSEGV, dummy);
+    DWRITE("ioport-check: ");
+    b = checkVmwareIO();
+    if(b) {
+        DWRITE("true\n");
+        return 0;
+    }
+    return 1;
 }
+// vim: foldmethod=marker
-- 
2.1.4