320 lines
9.2 KiB
C
320 lines
9.2 KiB
C
/*
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* Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* We need to do this early, because stdio.h includes the header files that
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* handle _GNU_SOURCE and other similar macros. Defining it later is simply
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* too late, because those headers are protected from re- inclusion.
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*/
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE /* make sure dladdr is declared */
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#endif
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#include "dso_locl.h"
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#ifdef DSO_DLFCN
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# ifdef HAVE_DLFCN_H
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# ifdef __osf__
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# define __EXTENSIONS__
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# endif
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# include <dlfcn.h>
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# define HAVE_DLINFO 1
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# if defined(_AIX) || defined(__CYGWIN__) || \
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defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
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(defined(__osf__) && !defined(RTLD_NEXT)) || \
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(defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
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defined(__ANDROID__)
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# undef HAVE_DLINFO
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# endif
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# endif
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/* Part of the hack in "dlfcn_load" ... */
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# define DSO_MAX_TRANSLATED_SIZE 256
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static int dlfcn_load(DSO *dso);
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static int dlfcn_unload(DSO *dso);
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static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
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static char *dlfcn_name_converter(DSO *dso, const char *filename);
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static char *dlfcn_merger(DSO *dso, const char *filespec1,
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const char *filespec2);
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static void *dlfcn_globallookup(const char *name);
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static DSO_METHOD dso_meth_dlfcn = {
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"OpenSSL 'dlfcn' shared library method",
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dlfcn_load,
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dlfcn_unload,
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dlfcn_bind_func,
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NULL, /* ctrl */
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dlfcn_name_converter,
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dlfcn_merger,
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NULL, /* init */
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NULL, /* finish */
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dlfcn_globallookup
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};
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DSO_METHOD *DSO_METHOD_openssl(void)
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{
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return &dso_meth_dlfcn;
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}
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/*
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* Prior to using the dlopen() function, we should decide on the flag we
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* send. There's a few different ways of doing this and it's a messy
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* venn-diagram to match up which platforms support what. So as we don't have
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* autoconf yet, I'm implementing a hack that could be hacked further
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* relatively easily to deal with cases as we find them. Initially this is to
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* cope with OpenBSD.
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*/
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# if defined(__OpenBSD__) || defined(__NetBSD__)
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# ifdef DL_LAZY
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# define DLOPEN_FLAG DL_LAZY
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# else
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# ifdef RTLD_NOW
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# define DLOPEN_FLAG RTLD_NOW
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# else
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# define DLOPEN_FLAG 0
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# endif
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# endif
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# else
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# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
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# endif
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/*
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* For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
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* (void*) returned from dlopen().
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*/
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static int dlfcn_load(DSO *dso)
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{
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void *ptr = NULL;
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/* See applicable comments in dso_dl.c */
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char *filename = DSO_convert_filename(dso, NULL);
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int flags = DLOPEN_FLAG;
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if (filename == NULL) {
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DSOerr(DSO_F_DLFCN_LOAD, DSO_R_NO_FILENAME);
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goto err;
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}
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# ifdef RTLD_GLOBAL
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if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
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flags |= RTLD_GLOBAL;
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# endif
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ptr = dlopen(filename, flags);
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if (ptr == NULL) {
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DSOerr(DSO_F_DLFCN_LOAD, DSO_R_LOAD_FAILED);
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ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
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goto err;
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}
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if (!sk_void_push(dso->meth_data, (char *)ptr)) {
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DSOerr(DSO_F_DLFCN_LOAD, DSO_R_STACK_ERROR);
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goto err;
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}
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/* Success */
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dso->loaded_filename = filename;
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return (1);
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err:
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/* Cleanup! */
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OPENSSL_free(filename);
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if (ptr != NULL)
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dlclose(ptr);
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return (0);
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}
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static int dlfcn_unload(DSO *dso)
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{
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void *ptr;
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if (dso == NULL) {
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DSOerr(DSO_F_DLFCN_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
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return (0);
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}
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if (sk_void_num(dso->meth_data) < 1)
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return (1);
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ptr = sk_void_pop(dso->meth_data);
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if (ptr == NULL) {
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DSOerr(DSO_F_DLFCN_UNLOAD, DSO_R_NULL_HANDLE);
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/*
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* Should push the value back onto the stack in case of a retry.
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*/
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sk_void_push(dso->meth_data, ptr);
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return (0);
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}
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/* For now I'm not aware of any errors associated with dlclose() */
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dlclose(ptr);
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return (1);
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}
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static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
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{
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void *ptr;
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union {
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DSO_FUNC_TYPE sym;
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void *dlret;
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} u;
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if ((dso == NULL) || (symname == NULL)) {
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DSOerr(DSO_F_DLFCN_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
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return (NULL);
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}
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if (sk_void_num(dso->meth_data) < 1) {
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DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_STACK_ERROR);
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return (NULL);
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}
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ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
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if (ptr == NULL) {
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DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_NULL_HANDLE);
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return (NULL);
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}
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u.dlret = dlsym(ptr, symname);
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if (u.dlret == NULL) {
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DSOerr(DSO_F_DLFCN_BIND_FUNC, DSO_R_SYM_FAILURE);
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ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
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return (NULL);
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}
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return u.sym;
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}
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static char *dlfcn_merger(DSO *dso, const char *filespec1,
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const char *filespec2)
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{
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char *merged;
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if (!filespec1 && !filespec2) {
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_PASSED_NULL_PARAMETER);
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return (NULL);
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}
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/*
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* If the first file specification is a rooted path, it rules. same goes
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* if the second file specification is missing.
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*/
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if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/')) {
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merged = OPENSSL_strdup(filespec1);
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if (merged == NULL) {
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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}
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/*
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* If the first file specification is missing, the second one rules.
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*/
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else if (!filespec1) {
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merged = OPENSSL_strdup(filespec2);
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if (merged == NULL) {
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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} else {
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/*
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* This part isn't as trivial as it looks. It assumes that the
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* second file specification really is a directory, and makes no
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* checks whatsoever. Therefore, the result becomes the
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* concatenation of filespec2 followed by a slash followed by
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* filespec1.
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*/
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int spec2len, len;
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spec2len = strlen(filespec2);
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len = spec2len + strlen(filespec1);
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if (spec2len && filespec2[spec2len - 1] == '/') {
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spec2len--;
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len--;
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}
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merged = OPENSSL_malloc(len + 2);
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if (merged == NULL) {
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DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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strcpy(merged, filespec2);
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merged[spec2len] = '/';
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strcpy(&merged[spec2len + 1], filespec1);
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}
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return (merged);
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}
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static char *dlfcn_name_converter(DSO *dso, const char *filename)
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{
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char *translated;
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int len, rsize, transform;
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len = strlen(filename);
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rsize = len + 1;
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transform = (strstr(filename, "/") == NULL);
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if (transform) {
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/* We will convert this to "%s.so" or "lib%s.so" etc */
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rsize += strlen(DSO_EXTENSION); /* The length of ".so" */
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if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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rsize += 3; /* The length of "lib" */
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}
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translated = OPENSSL_malloc(rsize);
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if (translated == NULL) {
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DSOerr(DSO_F_DLFCN_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
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return (NULL);
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}
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if (transform) {
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if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
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sprintf(translated, "lib%s" DSO_EXTENSION, filename);
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else
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sprintf(translated, "%s" DSO_EXTENSION, filename);
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} else
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sprintf(translated, "%s", filename);
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return (translated);
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}
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# ifdef __sgi
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/*-
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This is a quote from IRIX manual for dladdr(3c):
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<dlfcn.h> does not contain a prototype for dladdr or definition of
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Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
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but contains no dladdr prototype and no IRIX library contains an
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implementation. Write your own declaration based on the code below.
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The following code is dependent on internal interfaces that are not
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part of the IRIX compatibility guarantee; however, there is no future
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intention to change this interface, so on a practical level, the code
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below is safe to use on IRIX.
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*/
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# include <rld_interface.h>
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# ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
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# define _RLD_INTERFACE_DLFCN_H_DLADDR
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typedef struct Dl_info {
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const char *dli_fname;
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void *dli_fbase;
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const char *dli_sname;
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void *dli_saddr;
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int dli_version;
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int dli_reserved1;
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long dli_reserved[4];
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} Dl_info;
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# else
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typedef struct Dl_info Dl_info;
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# endif
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# define _RLD_DLADDR 14
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static int dladdr(void *address, Dl_info *dl)
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{
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void *v;
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v = _rld_new_interface(_RLD_DLADDR, address, dl);
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return (int)v;
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}
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# endif /* __sgi */
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static void *dlfcn_globallookup(const char *name)
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{
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void *ret = NULL, *handle = dlopen(NULL, RTLD_LAZY);
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if (handle) {
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ret = dlsym(handle, name);
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dlclose(handle);
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}
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return ret;
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}
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#endif /* DSO_DLFCN */
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