/*
* Copyright (c) 2009, 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.
*
* 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.
*
*/
#include <link.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <varargs.h>
// This class sets up an interposer on open calls from libproc.so to
// support a pathmap facility in the SA.
static uintptr_t* libproc_cookie;
static uintptr_t* libc_cookie;
static uintptr_t* libsaproc_cookie;
uint_t
la_version(uint_t version)
{
return (LAV_CURRENT);
}
uint_t
la_objopen(Link_map * lmp, Lmid_t lmid, uintptr_t * cookie)
{
if (strstr(lmp->l_name, "/libproc.so") != NULL) {
libproc_cookie = cookie;
return LA_FLG_BINDFROM;
}
if (strstr(lmp->l_name, "/libc.so") != NULL) {
libc_cookie = cookie;
return LA_FLG_BINDTO;
}
if (strstr(lmp->l_name, "/libsaproc.so") != NULL) {
libsaproc_cookie = cookie;
return LA_FLG_BINDTO | LA_FLG_BINDFROM;
}
return 0;
}
#if defined(_LP64)
uintptr_t
la_symbind64(Elf64_Sym *symp, uint_t symndx, uintptr_t *refcook,
uintptr_t *defcook, uint_t *sb_flags, const char *sym_name)
#else
uintptr_t
la_symbind32(Elf32_Sym *symp, uint_t symndx, uintptr_t *refcook,
uintptr_t *defcook, uint_t *sb_flags)
#endif
{
#if !defined(_LP64)
const char *sym_name = (const char *)symp->st_name;
#endif
if (strcmp(sym_name, "open") == 0 && refcook == libproc_cookie) {
// redirect all open calls from libproc.so through libsaproc_open which will
// try the alternate library locations first.
void* handle = dlmopen(LM_ID_BASE, "libsaproc.so", RTLD_NOLOAD);
if (handle == NULL) {
fprintf(stderr, "libsaproc_audit.so: didn't find libsaproc.so during linking\n");
} else {
uintptr_t libsaproc_open = (uintptr_t)dlsym(handle, "libsaproc_open");
if (libsaproc_open == 0) {
fprintf(stderr, "libsaproc_audit.so: didn't find libsaproc_open during linking\n");
} else {
return libsaproc_open;
}
}
}
return symp->st_value;
}