RetroZilla/security/nss/cmd/shlibsign/mangle/mangle.c

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2015-10-21 05:03:22 +02:00
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Test program to mangle 1 bit in a binary
*
* $Id: mangle.c,v 1.7 2007/01/26 19:38:05 nelson%bolyard.com Exp $
*/
#include "nspr.h"
#include "plstr.h"
#include "plgetopt.h"
#include "prio.h"
static PRFileDesc *pr_stderr;
static void
usage (char *program_name)
{
PR_fprintf (pr_stderr, "Usage:");
PR_fprintf (pr_stderr, "%s -i shared_library_name -o byte_offset -b bit\n", program_name);
}
int
main (int argc, char **argv)
{
/* buffers and locals */
PLOptState *optstate;
char *programName;
char cbuf;
/* parameter set variables */
const char *libFile = NULL;
int bitOffset = -1;
/* return values */
int retval = 2; /* 0 - test succeeded.
* 1 - illegal args
* 2 - function failed */
PRFileDesc *fd = NULL;
int bytesRead;
int bytesWritten;
PROffset32 offset = -1;
PROffset32 pos;
programName = PL_strrchr(argv[0], '/');
programName = programName ? (programName + 1) : argv[0];
pr_stderr = PR_STDERR;
optstate = PL_CreateOptState (argc, argv, "i:o:b:");
if (optstate == NULL) {
return 1;
}
while (PL_GetNextOpt (optstate) == PL_OPT_OK) {
switch (optstate->option) {
case 'i':
libFile = optstate->value;
break;
case 'o':
offset = atoi(optstate->value);
break;
case 'b':
bitOffset = atoi(optstate->value);
break;
}
}
if (libFile == NULL) {
usage(programName);
return 1;
}
if ((bitOffset >= 8) || (bitOffset < 0)) {
usage(programName);
return 1;
}
/* open the target signature file */
fd = PR_OpenFile(libFile,PR_RDWR,0666);
if (fd == NULL ) {
/* lperror(libFile); */
PR_fprintf(pr_stderr,"Couldn't Open %s\n",libFile);
goto loser;
}
if (offset < 0) { /* convert to positive offset */
pos = PR_Seek(fd, offset, PR_SEEK_END);
if (pos == -1) {
PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n",
libFile, offset);
goto loser;
}
offset = pos;
}
/* read the byte */
pos = PR_Seek(fd, offset, PR_SEEK_SET);
if (pos != offset) {
PR_fprintf(pr_stderr,"Seek for read on %s (to %d) failed\n",
libFile, offset);
goto loser;
}
bytesRead = PR_Read(fd, &cbuf, 1);
if (bytesRead != 1) {
PR_fprintf(pr_stderr,"Read on %s (to %d) failed\n", libFile, offset);
goto loser;
}
PR_fprintf(pr_stderr,"Changing byte 0x%08x (%d): from %02x (%d) to ",
offset, offset, (unsigned char)cbuf, (unsigned char)cbuf);
/* change it */
cbuf ^= 1 << bitOffset;
PR_fprintf(pr_stderr,"%02x (%d)\n",
(unsigned char)cbuf, (unsigned char)cbuf);
/* write it back out */
pos = PR_Seek(fd, offset, PR_SEEK_SET);
if (pos != offset) {
PR_fprintf(pr_stderr,"Seek for write on %s (to %d) failed\n",
libFile, offset);
goto loser;
}
bytesWritten = PR_Write(fd, &cbuf, 1);
if (bytesWritten != 1) {
PR_fprintf(pr_stderr,"Write on %s (to %d) failed\n", libFile, offset);
goto loser;
}
retval = 0;
loser:
if (fd)
PR_Close(fd);
PR_Cleanup ();
return retval;
}
/*#DEFINES += -DSHLIB_SUFFIX=\"$(DLL_SUFFIX)\" -DSHLIB_PREFIX=\"$(DLL_PREFIX)\" */