1 /* dso_dl.c -*- mode:C; c-file-style: "eay" -*- */
3 * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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32 * nor may "OpenSSL" appear in their names without prior written
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35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
62 #include <openssl/dso.h>
65 DSO_METHOD *DSO_METHOD_dl(void)
73 /* Part of the hack in "dl_load" ... */
74 # define DSO_MAX_TRANSLATED_SIZE 256
76 static int dl_load(DSO *dso);
77 static int dl_unload(DSO *dso);
78 static void *dl_bind_var(DSO *dso, const char *symname);
79 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
81 static int dl_unbind_var(DSO *dso, char *symname, void *symptr);
82 static int dl_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
83 static int dl_init(DSO *dso);
84 static int dl_finish(DSO *dso);
85 static int dl_ctrl(DSO *dso, int cmd, long larg, void *parg);
87 static char *dl_name_converter(DSO *dso, const char *filename);
88 static char *dl_merger(DSO *dso, const char *filespec1,
89 const char *filespec2);
91 static DSO_METHOD dso_meth_dl = {
92 "OpenSSL 'dl' shared library method",
97 /* For now, "unbind" doesn't exist */
99 NULL, /* unbind_var */
100 NULL, /* unbind_func */
109 DSO_METHOD *DSO_METHOD_dl(void)
111 return (&dso_meth_dl);
115 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
116 * (shl_t) returned from shl_load(). NB: I checked on HPUX11 and shl_t is
117 * itself a pointer type so the cast is safe.
120 static int dl_load(DSO *dso)
124 * We don't do any fancy retries or anything, just take the method's (or
125 * DSO's if it has the callback set) best translation of the
126 * platform-independant filename and try once with that.
128 char *filename = DSO_convert_filename(dso, NULL);
130 if (filename == NULL) {
131 DSOerr(DSO_F_DL_LOAD, DSO_R_NO_FILENAME);
134 ptr = shl_load(filename, BIND_IMMEDIATE |
135 (dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 :
138 DSOerr(DSO_F_DL_LOAD, DSO_R_LOAD_FAILED);
139 ERR_add_error_data(4, "filename(", filename, "): ", strerror(errno));
142 if (!sk_push(dso->meth_data, (char *)ptr)) {
143 DSOerr(DSO_F_DL_LOAD, DSO_R_STACK_ERROR);
147 * Success, stick the converted filename we've loaded under into the DSO
148 * (it also serves as the indicator that we are currently loaded).
150 dso->loaded_filename = filename;
154 if (filename != NULL)
155 OPENSSL_free(filename);
161 static int dl_unload(DSO *dso)
165 DSOerr(DSO_F_DL_UNLOAD, ERR_R_PASSED_NULL_PARAMETER);
168 if (sk_num(dso->meth_data) < 1)
170 /* Is this statement legal? */
171 ptr = (shl_t) sk_pop(dso->meth_data);
173 DSOerr(DSO_F_DL_UNLOAD, DSO_R_NULL_HANDLE);
175 * Should push the value back onto the stack in case of a retry.
177 sk_push(dso->meth_data, (char *)ptr);
184 static void *dl_bind_var(DSO *dso, const char *symname)
189 if ((dso == NULL) || (symname == NULL)) {
190 DSOerr(DSO_F_DL_BIND_VAR, ERR_R_PASSED_NULL_PARAMETER);
193 if (sk_num(dso->meth_data) < 1) {
194 DSOerr(DSO_F_DL_BIND_VAR, DSO_R_STACK_ERROR);
197 ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
199 DSOerr(DSO_F_DL_BIND_VAR, DSO_R_NULL_HANDLE);
202 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
203 DSOerr(DSO_F_DL_BIND_VAR, DSO_R_SYM_FAILURE);
204 ERR_add_error_data(4, "symname(", symname, "): ", strerror(errno));
210 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
215 if ((dso == NULL) || (symname == NULL)) {
216 DSOerr(DSO_F_DL_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
219 if (sk_num(dso->meth_data) < 1) {
220 DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_STACK_ERROR);
223 ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
225 DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_NULL_HANDLE);
228 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
229 DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_SYM_FAILURE);
230 ERR_add_error_data(4, "symname(", symname, "): ", strerror(errno));
233 return ((DSO_FUNC_TYPE)sym);
236 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
240 if (!filespec1 && !filespec2) {
241 DSOerr(DSO_F_DL_MERGER, ERR_R_PASSED_NULL_PARAMETER);
245 * If the first file specification is a rooted path, it rules. same goes
246 * if the second file specification is missing.
248 if (!filespec2 || filespec1[0] == '/') {
249 merged = OPENSSL_malloc(strlen(filespec1) + 1);
251 DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE);
254 strcpy(merged, filespec1);
257 * If the first file specification is missing, the second one rules.
259 else if (!filespec1) {
260 merged = OPENSSL_malloc(strlen(filespec2) + 1);
262 DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE);
265 strcpy(merged, filespec2);
268 * This part isn't as trivial as it looks. It assumes that the
269 * second file specification really is a directory, and makes no
270 * checks whatsoever. Therefore, the result becomes the
271 * concatenation of filespec2 followed by a slash followed by
277 spec2len = (filespec2 ? strlen(filespec2) : 0);
278 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
280 if (filespec2 && filespec2[spec2len - 1] == '/') {
284 merged = OPENSSL_malloc(len + 2);
286 DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE);
289 strcpy(merged, filespec2);
290 merged[spec2len] = '/';
291 strcpy(&merged[spec2len + 1], filespec1);
297 * This function is identical to the one in dso_dlfcn.c, but as it is highly
298 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
299 * the same time, there's no great duplicating the code. Figuring out an
300 * elegant way to share one copy of the code would be more difficult and
301 * would not leave the implementations independant.
304 static const char extension[] = ".sl";
306 static const char extension[] = ".so";
308 static char *dl_name_converter(DSO *dso, const char *filename)
311 int len, rsize, transform;
313 len = strlen(filename);
315 transform = (strstr(filename, "/") == NULL);
317 /* We will convert this to "%s.s?" or "lib%s.s?" */
318 rsize += strlen(extension); /* The length of ".s?" */
319 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
320 rsize += 3; /* The length of "lib" */
322 translated = OPENSSL_malloc(rsize);
323 if (translated == NULL) {
324 DSOerr(DSO_F_DL_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED);
328 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
329 sprintf(translated, "lib%s%s", filename, extension);
331 sprintf(translated, "%s%s", filename, extension);
333 sprintf(translated, "%s", filename);