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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29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
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
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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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
);
90 static int dl_pathbyaddr(void *addr
, char *path
, int sz
);
91 static void *dl_globallookup(const char *name
);
93 static DSO_METHOD dso_meth_dl
= {
94 "OpenSSL 'dl' shared library method",
99 /* For now, "unbind" doesn't exist */
101 NULL
, /* unbind_var */
102 NULL
, /* unbind_func */
113 DSO_METHOD
*DSO_METHOD_dl(void)
115 return (&dso_meth_dl
);
119 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
120 * (shl_t) returned from shl_load(). NB: I checked on HPUX11 and shl_t is
121 * itself a pointer type so the cast is safe.
124 static int dl_load(DSO
*dso
)
128 * We don't do any fancy retries or anything, just take the method's (or
129 * DSO's if it has the callback set) best translation of the
130 * platform-independant filename and try once with that.
132 char *filename
= DSO_convert_filename(dso
, NULL
);
134 if (filename
== NULL
) {
135 DSOerr(DSO_F_DL_LOAD
, DSO_R_NO_FILENAME
);
138 ptr
= shl_load(filename
, BIND_IMMEDIATE
|
139 (dso
->flags
& DSO_FLAG_NO_NAME_TRANSLATION
? 0 :
142 DSOerr(DSO_F_DL_LOAD
, DSO_R_LOAD_FAILED
);
143 ERR_add_error_data(4, "filename(", filename
, "): ", strerror(errno
));
146 if (!sk_push(dso
->meth_data
, (char *)ptr
)) {
147 DSOerr(DSO_F_DL_LOAD
, DSO_R_STACK_ERROR
);
151 * Success, stick the converted filename we've loaded under into the DSO
152 * (it also serves as the indicator that we are currently loaded).
154 dso
->loaded_filename
= filename
;
158 if (filename
!= NULL
)
159 OPENSSL_free(filename
);
165 static int dl_unload(DSO
*dso
)
169 DSOerr(DSO_F_DL_UNLOAD
, ERR_R_PASSED_NULL_PARAMETER
);
172 if (sk_num(dso
->meth_data
) < 1)
174 /* Is this statement legal? */
175 ptr
= (shl_t
) sk_pop(dso
->meth_data
);
177 DSOerr(DSO_F_DL_UNLOAD
, DSO_R_NULL_HANDLE
);
179 * Should push the value back onto the stack in case of a retry.
181 sk_push(dso
->meth_data
, (char *)ptr
);
188 static void *dl_bind_var(DSO
*dso
, const char *symname
)
193 if ((dso
== NULL
) || (symname
== NULL
)) {
194 DSOerr(DSO_F_DL_BIND_VAR
, ERR_R_PASSED_NULL_PARAMETER
);
197 if (sk_num(dso
->meth_data
) < 1) {
198 DSOerr(DSO_F_DL_BIND_VAR
, DSO_R_STACK_ERROR
);
201 ptr
= (shl_t
) sk_value(dso
->meth_data
, sk_num(dso
->meth_data
) - 1);
203 DSOerr(DSO_F_DL_BIND_VAR
, DSO_R_NULL_HANDLE
);
206 if (shl_findsym(&ptr
, symname
, TYPE_UNDEFINED
, &sym
) < 0) {
207 DSOerr(DSO_F_DL_BIND_VAR
, DSO_R_SYM_FAILURE
);
208 ERR_add_error_data(4, "symname(", symname
, "): ", strerror(errno
));
214 static DSO_FUNC_TYPE
dl_bind_func(DSO
*dso
, const char *symname
)
219 if ((dso
== NULL
) || (symname
== NULL
)) {
220 DSOerr(DSO_F_DL_BIND_FUNC
, ERR_R_PASSED_NULL_PARAMETER
);
223 if (sk_num(dso
->meth_data
) < 1) {
224 DSOerr(DSO_F_DL_BIND_FUNC
, DSO_R_STACK_ERROR
);
227 ptr
= (shl_t
) sk_value(dso
->meth_data
, sk_num(dso
->meth_data
) - 1);
229 DSOerr(DSO_F_DL_BIND_FUNC
, DSO_R_NULL_HANDLE
);
232 if (shl_findsym(&ptr
, symname
, TYPE_UNDEFINED
, &sym
) < 0) {
233 DSOerr(DSO_F_DL_BIND_FUNC
, DSO_R_SYM_FAILURE
);
234 ERR_add_error_data(4, "symname(", symname
, "): ", strerror(errno
));
237 return ((DSO_FUNC_TYPE
)sym
);
240 static char *dl_merger(DSO
*dso
, const char *filespec1
, const char *filespec2
)
244 if (!filespec1
&& !filespec2
) {
245 DSOerr(DSO_F_DL_MERGER
, ERR_R_PASSED_NULL_PARAMETER
);
249 * If the first file specification is a rooted path, it rules. same goes
250 * if the second file specification is missing.
252 if (!filespec2
|| filespec1
[0] == '/') {
253 merged
= OPENSSL_malloc(strlen(filespec1
) + 1);
255 DSOerr(DSO_F_DL_MERGER
, ERR_R_MALLOC_FAILURE
);
258 strcpy(merged
, filespec1
);
261 * If the first file specification is missing, the second one rules.
263 else if (!filespec1
) {
264 merged
= OPENSSL_malloc(strlen(filespec2
) + 1);
266 DSOerr(DSO_F_DL_MERGER
, ERR_R_MALLOC_FAILURE
);
269 strcpy(merged
, filespec2
);
272 * This part isn't as trivial as it looks. It assumes that the
273 * second file specification really is a directory, and makes no
274 * checks whatsoever. Therefore, the result becomes the
275 * concatenation of filespec2 followed by a slash followed by
281 spec2len
= (filespec2
? strlen(filespec2
) : 0);
282 len
= spec2len
+ (filespec1
? strlen(filespec1
) : 0);
284 if (filespec2
&& filespec2
[spec2len
- 1] == '/') {
288 merged
= OPENSSL_malloc(len
+ 2);
290 DSOerr(DSO_F_DL_MERGER
, ERR_R_MALLOC_FAILURE
);
293 strcpy(merged
, filespec2
);
294 merged
[spec2len
] = '/';
295 strcpy(&merged
[spec2len
+ 1], filespec1
);
301 * This function is identical to the one in dso_dlfcn.c, but as it is highly
302 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
303 * the same time, there's no great duplicating the code. Figuring out an
304 * elegant way to share one copy of the code would be more difficult and
305 * would not leave the implementations independant.
308 static const char extension
[] = ".sl";
310 static const char extension
[] = ".so";
312 static char *dl_name_converter(DSO
*dso
, const char *filename
)
315 int len
, rsize
, transform
;
317 len
= strlen(filename
);
319 transform
= (strstr(filename
, "/") == NULL
);
321 /* We will convert this to "%s.s?" or "lib%s.s?" */
322 rsize
+= strlen(extension
); /* The length of ".s?" */
323 if ((DSO_flags(dso
) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY
) == 0)
324 rsize
+= 3; /* The length of "lib" */
326 translated
= OPENSSL_malloc(rsize
);
327 if (translated
== NULL
) {
328 DSOerr(DSO_F_DL_NAME_CONVERTER
, DSO_R_NAME_TRANSLATION_FAILED
);
332 if ((DSO_flags(dso
) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY
) == 0)
333 sprintf(translated
, "lib%s%s", filename
, extension
);
335 sprintf(translated
, "%s%s", filename
, extension
);
337 sprintf(translated
, "%s", filename
);
341 static int dl_pathbyaddr(void *addr
, char *path
, int sz
)
343 struct shl_descriptor inf
;
348 int (*f
) (void *, char *, int);
356 for (i
= -1; shl_get_r(i
, &inf
) == 0; i
++) {
357 if (((size_t)addr
>= inf
.tstart
&& (size_t)addr
< inf
.tend
) ||
358 ((size_t)addr
>= inf
.dstart
&& (size_t)addr
< inf
.dend
)) {
359 len
= (int)strlen(inf
.filename
);
364 memcpy(path
, inf
.filename
, len
);
373 static void *dl_globallookup(const char *name
)
378 return shl_findsym(&h
, name
, TYPE_UNDEFINED
, &ret
) ? NULL
: ret
;