| /* |
| * 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; |
| } |