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/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#define _GNU_SOURCE
#include <dlfcn.h>
#include <stdio.h>
#include "os.h"
#include "iolib.h"
#include "trace.h"
static int tLevel = trcLevel;
struct dlfcn_hook {
void *(*dlopen)(const char *, int, void *);
int (*dlclose)(void *);
void *(*dlsym)(void *, const char *, void *);
void *(*dlvsym)(void *, const char *, const char *, void *);
char *(*dlerror)(void);
int (*dladdr)(const void *, Dl_info *);
int (*dladdr1)(const void *, Dl_info *, void **, int);
int (*dlinfo)(void *, int, void *, void *);
void *(*dlmopen)(Lmid_t, const char *, int, void *);
void *pad[4];
};
static void *trace_dlopen(const char*, int, void*);
static int trace_dlclose(void *);
static void *trace_dlsym(void *, const char *, void *);
static void *trace_dlvsym(void *, const char *, const char *, void *);
static char *trace_dlerror(void);
static int trace_dladdr(const void *, Dl_info *);
static int trace_dladdr1(const void *, Dl_info *, void **, int);
static int trace_dlinfo(void *, int, void *, void *);
static void *trace_dlmopen(Lmid_t, const char *, int, void *);
static struct dlfcn_hook dlfcn_hook = {
.dlopen = trace_dlopen,
.dlclose = trace_dlclose,
.dlsym = trace_dlsym,
.dlvsym = trace_dlvsym,
.dlerror = trace_dlerror,
.dladdr = trace_dladdr,
.dladdr1 = trace_dladdr1,
.dlinfo = trace_dlinfo,
.dlmopen = trace_dlmopen,
.pad = {0, 0, 0, 0},
};
struct dlfcn_hook *dlfcn_hook_orig;
struct dlfcn_hook *dlfcn_hook_trace = &dlfcn_hook;
static void *libSelf = NULL;
void *
trace_dlopen(const char *file, int mode, void *dl_caller)
{
DLFCN_HOOK_POP();
void *result = dlopen(file, mode);
DLFCN_HOOK_PUSH();
return result;
}
int
trace_dlclose(void *handle)
{
DLFCN_HOOK_POP();
int result = dlclose(handle);
DLFCN_HOOK_PUSH();
return result;
}
void *
trace_dlsym(void *handle, const char *name, void *dl_caller)
{
DLFCN_HOOK_POP();
void *result = dlsym(libSelf, name);
if (tLevel >= dbgLevel && result != NULL) {
fprintf(stderr, "INTERCEPTION: %p %s = %p\n", handle, name, result);
}
if (result == NULL) {
result = dlsym(handle, name);
}
DLFCN_HOOK_PUSH();
return result;
}
void *
trace_dlvsym(void *handle, const char *name, const char *version, void *dl_caller)
{
DLFCN_HOOK_POP();
void *result = dlvsym(libSelf, name, version);
if (tLevel >= dbgLevel && result != NULL) {
fprintf(stderr, "INTERCEPTION: %p %s.%s = %p\n", handle, name, version, result);
}
if (result == NULL) {
result = dlvsym(handle, name, version);
}
DLFCN_HOOK_PUSH();
return result;
}
char *
trace_dlerror(void)
{
DLFCN_HOOK_POP();
char *result = dlerror();
DLFCN_HOOK_PUSH();
return result;
}
int
trace_dladdr(const void *address, Dl_info *info)
{
DLFCN_HOOK_POP();
int result = dladdr(address, info);
DLFCN_HOOK_PUSH();
return result;
}
int
trace_dladdr1(const void *address, Dl_info *info, void **extra, int flags)
{
DLFCN_HOOK_POP();
int result = dladdr1(address, info, extra, flags);
DLFCN_HOOK_PUSH();
return result;
}
int
trace_dlinfo(void *handle, int request, void *arg, void *dl_caller)
{
DLFCN_HOOK_POP();
int result = dlinfo(handle, request, arg);
DLFCN_HOOK_PUSH();
return result;
}
void *
trace_dlmopen(Lmid_t nsid, const char *file, int mode, void *dl_caller)
{
DLFCN_HOOK_POP();
void *result = dlmopen(nsid, file, mode);
DLFCN_HOOK_PUSH();
return result;
}
/*
* Init/fini
*/
static void init() __attribute__ ((constructor));
static void
init()
{
Dl_info info;
if (dladdr(&init, &info)) {
libSelf = dlopen(info.dli_fname, RTLD_LAZY|RTLD_NOLOAD);
}
iolib_init(IO_WRITE, NULL);
DLFCN_HOOK_INIT();
DLFCN_HOOK_PUSH();
if (tLevel >= dbgLevel) {
fprintf(stderr, "INTERPOSITION STARTED\n");
}
}
static void fini() __attribute__ ((destructor));
static void fini()
{
DLFCN_HOOK_POP();
iolib_fini();
if (tLevel >= dbgLevel) {
fprintf(stderr, "INTERPOSITION FINISHED\n");
}
}
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