2 * Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "dso_local.h"
16 /* Part of the hack in "dl_load" ... */
17 # define DSO_MAX_TRANSLATED_SIZE 256
19 static int dl_load(DSO *dso);
20 static int dl_unload(DSO *dso);
21 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
22 static char *dl_name_converter(DSO *dso, const char *filename);
23 static char *dl_merger(DSO *dso, const char *filespec1,
24 const char *filespec2);
25 static int dl_pathbyaddr(void *addr, char *path, int sz);
26 static void *dl_globallookup(const char *name);
28 static DSO_METHOD dso_meth_dl = {
29 "OpenSSL 'dl' shared library method",
42 DSO_METHOD *DSO_METHOD_openssl(void)
48 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
49 * (shl_t) returned from shl_load(). NB: I checked on HPUX11 and shl_t is
50 * itself a pointer type so the cast is safe.
53 static int dl_load(DSO *dso)
57 * We don't do any fancy retries or anything, just take the method's (or
58 * DSO's if it has the callback set) best translation of the
59 * platform-independent filename and try once with that.
61 char *filename = DSO_convert_filename(dso, NULL);
63 if (filename == NULL) {
64 ERR_raise(ERR_LIB_DSO, DSO_R_NO_FILENAME);
67 ptr = shl_load(filename, BIND_IMMEDIATE |
68 (dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 :
73 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
74 ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
75 "filename(%s): %s", filename, errbuf);
77 ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
78 "filename(%s): errno %d", filename, errno);
81 if (!sk_push(dso->meth_data, (char *)ptr)) {
82 ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
86 * Success, stick the converted filename we've loaded under into the DSO
87 * (it also serves as the indicator that we are currently loaded).
89 dso->loaded_filename = filename;
93 OPENSSL_free(filename);
99 static int dl_unload(DSO *dso)
103 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
106 if (sk_num(dso->meth_data) < 1)
108 /* Is this statement legal? */
109 ptr = (shl_t) sk_pop(dso->meth_data);
111 ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE);
113 * Should push the value back onto the stack in case of a retry.
115 sk_push(dso->meth_data, (char *)ptr);
122 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
127 if ((dso == NULL) || (symname == NULL)) {
128 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
131 if (sk_num(dso->meth_data) < 1) {
132 ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
135 ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
137 ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE);
140 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
143 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
144 ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
145 "symname(%s): %s", symname, errbuf);
147 ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
148 "symname(%s): errno %d", symname, errno);
151 return (DSO_FUNC_TYPE)sym;
154 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
158 if (!filespec1 && !filespec2) {
159 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
163 * If the first file specification is a rooted path, it rules. same goes
164 * if the second file specification is missing.
166 if (!filespec2 || filespec1[0] == '/') {
167 merged = OPENSSL_strdup(filespec1);
168 if (merged == NULL) {
169 ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE);
174 * If the first file specification is missing, the second one rules.
176 else if (!filespec1) {
177 merged = OPENSSL_strdup(filespec2);
178 if (merged == NULL) {
179 ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE);
184 * This part isn't as trivial as it looks. It assumes that the
185 * second file specification really is a directory, and makes no
186 * checks whatsoever. Therefore, the result becomes the
187 * concatenation of filespec2 followed by a slash followed by
193 spec2len = (filespec2 ? strlen(filespec2) : 0);
194 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
196 if (spec2len && filespec2[spec2len - 1] == '/') {
200 merged = OPENSSL_malloc(len + 2);
201 if (merged == NULL) {
202 ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE);
205 strcpy(merged, filespec2);
206 merged[spec2len] = '/';
207 strcpy(&merged[spec2len + 1], filespec1);
213 * This function is identical to the one in dso_dlfcn.c, but as it is highly
214 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
215 * the same time, there's no great duplicating the code. Figuring out an
216 * elegant way to share one copy of the code would be more difficult and
217 * would not leave the implementations independent.
219 static char *dl_name_converter(DSO *dso, const char *filename)
222 int len, rsize, transform;
224 len = strlen(filename);
226 transform = (strstr(filename, "/") == NULL);
228 /* We will convert this to "%s.s?" or "lib%s.s?" */
229 rsize += strlen(DSO_EXTENSION); /* The length of ".s?" */
230 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
231 rsize += 3; /* The length of "lib" */
233 translated = OPENSSL_malloc(rsize);
234 if (translated == NULL) {
235 ERR_raise(ERR_LIB_DSO, DSO_R_NAME_TRANSLATION_FAILED);
239 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
240 sprintf(translated, "lib%s%s", filename, DSO_EXTENSION);
242 sprintf(translated, "%s%s", filename, DSO_EXTENSION);
244 sprintf(translated, "%s", filename);
248 static int dl_pathbyaddr(void *addr, char *path, int sz)
250 struct shl_descriptor inf;
255 int (*f) (void *, char *, int);
263 for (i = -1; shl_get_r(i, &inf) == 0; i++) {
264 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
265 ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) {
266 len = (int)strlen(inf.filename);
271 memcpy(path, inf.filename, len);
280 static void *dl_globallookup(const char *name)
285 return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret;