diff options
Diffstat (limited to 'security/nss/cmd/shlibsign/mangle/mangle.c')
| -rw-r--r-- | security/nss/cmd/shlibsign/mangle/mangle.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/security/nss/cmd/shlibsign/mangle/mangle.c b/security/nss/cmd/shlibsign/mangle/mangle.c new file mode 100644 index 000000000..7ff34b5e6 --- /dev/null +++ b/security/nss/cmd/shlibsign/mangle/mangle.c @@ -0,0 +1,166 @@ +/* + * 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 Netscape are + * Copyright (C) 1994-2003 Netscape Communications Corporation. All + * Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the + * terms of the GNU General Public License Version 2 or later (the + * "GPL"), in which case the provisions of the GPL are applicable + * instead of those above. If you wish to allow use of your + * version of this file only under the terms of the GPL and not to + * allow others to use your version of this file under the MPL, + * indicate your decision by deleting the provisions above and + * replace them with the notice and other provisions required by + * the GPL. If you do not delete the provisions above, a recipient + * may use your version of this file under either the MPL or the + * GPL. + */ + +/* + * Test program to mangle 1 bit in a binary + * + * $Id$ + */ + +#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 offset = -1; + int bitOffset = -1; + + /* return values */ + int retval = 2; /* 0 - test succeeded. + * 1 - illegal args + * 2 - function failed */ + PRFileDesc *fd; + int bytesRead; + int bytesWritten; + int 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; + } + + if (offset < 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; + } + + /* 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; + } + + PR_Close(fd); + retval = 0; + + +loser: + + PR_Cleanup (); + return retval; +} + +/*#DEFINES += -DSHLIB_SUFFIX=\"$(DLL_SUFFIX)\" -DSHLIB_PREFIX=\"$(DLL_PREFIX)\" */ |