mirror of
https://github.com/openssl/openssl.git
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605856d72c
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/13533)
288 lines
8.4 KiB
C
288 lines
8.4 KiB
C
/*
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* Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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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#include "dso_local.h"
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#ifdef DSO_DL
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# include <dl.h>
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/* Part of the hack in "dl_load" ... */
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# define DSO_MAX_TRANSLATED_SIZE 256
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static int dl_load(DSO *dso);
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static int dl_unload(DSO *dso);
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static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
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static char *dl_name_converter(DSO *dso, const char *filename);
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static char *dl_merger(DSO *dso, const char *filespec1,
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const char *filespec2);
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static int dl_pathbyaddr(void *addr, char *path, int sz);
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static void *dl_globallookup(const char *name);
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static DSO_METHOD dso_meth_dl = {
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"OpenSSL 'dl' shared library method",
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dl_load,
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dl_unload,
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dl_bind_func,
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NULL, /* ctrl */
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dl_name_converter,
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dl_merger,
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NULL, /* init */
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NULL, /* finish */
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dl_pathbyaddr,
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dl_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_dl;
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}
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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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* (shl_t) returned from shl_load(). NB: I checked on HPUX11 and shl_t is
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* itself a pointer type so the cast is safe.
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*/
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static int dl_load(DSO *dso)
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{
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shl_t ptr = NULL;
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/*
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* We don't do any fancy retries or anything, just take the method's (or
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* DSO's if it has the callback set) best translation of the
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* platform-independent filename and try once with that.
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*/
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char *filename = DSO_convert_filename(dso, NULL);
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if (filename == NULL) {
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ERR_raise(ERR_LIB_DSO, DSO_R_NO_FILENAME);
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goto err;
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}
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ptr = shl_load(filename, BIND_IMMEDIATE |
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(dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 :
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DYNAMIC_PATH), 0L);
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if (ptr == NULL) {
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char errbuf[160];
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if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
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ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
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"filename(%s): %s", filename, errbuf);
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else
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ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
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"filename(%s): errno %d", filename, errno);
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goto err;
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}
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if (!sk_push(dso->meth_data, (char *)ptr)) {
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ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
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goto err;
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}
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/*
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* Success, stick the converted filename we've loaded under into the DSO
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* (it also serves as the indicator that we are currently loaded).
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*/
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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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shl_unload(ptr);
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return 0;
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}
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static int dl_unload(DSO *dso)
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{
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shl_t ptr;
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if (dso == NULL) {
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ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (sk_num(dso->meth_data) < 1)
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return 1;
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/* Is this statement legal? */
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ptr = (shl_t) sk_pop(dso->meth_data);
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if (ptr == NULL) {
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ERR_raise(ERR_LIB_DSO, 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_push(dso->meth_data, (char *)ptr);
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return 0;
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}
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shl_unload(ptr);
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return 1;
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}
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static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
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{
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shl_t ptr;
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void *sym;
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if ((dso == NULL) || (symname == NULL)) {
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ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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if (sk_num(dso->meth_data) < 1) {
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ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
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return NULL;
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}
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ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
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if (ptr == NULL) {
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ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE);
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return NULL;
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}
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if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
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char errbuf[160];
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if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
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ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
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"symname(%s): %s", symname, errbuf);
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else
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ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
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"symname(%s): errno %d", symname, errno);
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return NULL;
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}
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return (DSO_FUNC_TYPE)sym;
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}
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static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
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{
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char *merged;
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if (!filespec1 && !filespec2) {
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ERR_raise(ERR_LIB_DSO, 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[0] == '/') {
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merged = OPENSSL_strdup(filespec1);
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if (merged == NULL) {
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ERR_raise(ERR_LIB_DSO, 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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ERR_raise(ERR_LIB_DSO, 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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{
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int spec2len, len;
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spec2len = (filespec2 ? strlen(filespec2) : 0);
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len = spec2len + (filespec1 ? strlen(filespec1) : 0);
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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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ERR_raise(ERR_LIB_DSO, 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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/*
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* This function is identical to the one in dso_dlfcn.c, but as it is highly
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* unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
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* the same time, there's no great duplicating the code. Figuring out an
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* elegant way to share one copy of the code would be more difficult and
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* would not leave the implementations independent.
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*/
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static char *dl_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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{
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/* We will convert this to "%s.s?" or "lib%s.s?" */
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rsize += strlen(DSO_EXTENSION); /* The length of ".s?" */
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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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ERR_raise(ERR_LIB_DSO, 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%s", filename, DSO_EXTENSION);
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else
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sprintf(translated, "%s%s", filename, DSO_EXTENSION);
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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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static int dl_pathbyaddr(void *addr, char *path, int sz)
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{
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struct shl_descriptor inf;
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int i, len;
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if (addr == NULL) {
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union {
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int (*f) (void *, char *, int);
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void *p;
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} t = {
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dl_pathbyaddr
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};
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addr = t.p;
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}
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for (i = -1; shl_get_r(i, &inf) == 0; i++) {
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if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
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((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) {
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len = (int)strlen(inf.filename);
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if (sz <= 0)
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return len + 1;
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if (len >= sz)
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len = sz - 1;
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memcpy(path, inf.filename, len);
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path[len++] = 0;
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return len;
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}
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}
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return -1;
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}
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static void *dl_globallookup(const char *name)
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{
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void *ret;
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shl_t h = NULL;
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return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret;
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}
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#endif /* DSO_DL */
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