1 files changed, 140 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 0000000000..e58bbee410
--- /dev/null
+++ b/security/nss/cmd/shlibsign/mangle/mangle.c
@@ -0,0 +1,140 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Test program to mangle 1 bit in a binary
+ */
+
+#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)\" */