1 /* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
59 /* We need to do this early, because stdio.h includes the header files
60 that handle _GNU_SOURCE and other similar macros. Defining it later
61 is simply too late, because those headers are protected from re-
65 # define _GNU_SOURCE /* make sure dladdr is declared */
71 #include <openssl/dso.h>
74 DSO_METHOD *DSO_METHOD_dlfcn(void)
82 # define __EXTENSIONS__
85 # define HAVE_DLINFO 1
86 # if defined(_AIX) || defined(__CYGWIN__) || \
87 defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
88 (defined(__osf__) && !defined(RTLD_NEXT)) || \
89 (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
95 /* Part of the hack in "dlfcn_load" ... */
96 #define DSO_MAX_TRANSLATED_SIZE 256
98 static int dlfcn_load(DSO *dso);
99 static int dlfcn_unload(DSO *dso);
100 static void *dlfcn_bind_var(DSO *dso, const char *symname);
101 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
103 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
104 static int dlfcn_init(DSO *dso);
105 static int dlfcn_finish(DSO *dso);
106 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
108 static char *dlfcn_name_converter(DSO *dso, const char *filename);
109 static char *dlfcn_merger(DSO *dso, const char *filespec1,
110 const char *filespec2);
111 static int dlfcn_pathbyaddr(void *addr,char *path,int sz);
112 static void *dlfcn_globallookup(const char *name);
114 static DSO_METHOD dso_meth_dlfcn = {
115 "OpenSSL 'dlfcn' shared library method",
120 /* For now, "unbind" doesn't exist */
122 NULL, /* unbind_var */
123 NULL, /* unbind_func */
126 dlfcn_name_converter,
134 DSO_METHOD *DSO_METHOD_dlfcn(void)
136 return(&dso_meth_dlfcn);
139 /* Prior to using the dlopen() function, we should decide on the flag
140 * we send. There's a few different ways of doing this and it's a
141 * messy venn-diagram to match up which platforms support what. So
142 * as we don't have autoconf yet, I'm implementing a hack that could
143 * be hacked further relatively easily to deal with cases as we find
144 * them. Initially this is to cope with OpenBSD. */
145 #if defined(__OpenBSD__) || defined(__NetBSD__)
147 # define DLOPEN_FLAG DL_LAZY
150 # define DLOPEN_FLAG RTLD_NOW
152 # define DLOPEN_FLAG 0
156 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
159 /* For this DSO_METHOD, our meth_data STACK will contain;
160 * (i) the handle (void*) returned from dlopen().
163 static int dlfcn_load(DSO *dso)
166 /* See applicable comments in dso_dl.c */
167 char *filename = DSO_convert_filename(dso, NULL);
168 int flags = DLOPEN_FLAG;
172 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
177 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
178 flags |= RTLD_GLOBAL;
180 ptr = dlopen(filename, flags);
183 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
184 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
187 if(!sk_void_push(dso->meth_data, (char *)ptr))
189 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
193 dso->loaded_filename = filename;
198 OPENSSL_free(filename);
204 static int dlfcn_unload(DSO *dso)
209 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
212 if(sk_void_num(dso->meth_data) < 1)
214 ptr = sk_void_pop(dso->meth_data);
217 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
218 /* Should push the value back onto the stack in
219 * case of a retry. */
220 sk_void_push(dso->meth_data, ptr);
223 /* For now I'm not aware of any errors associated with dlclose() */
228 static void *dlfcn_bind_var(DSO *dso, const char *symname)
232 if((dso == NULL) || (symname == NULL))
234 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
237 if(sk_void_num(dso->meth_data) < 1)
239 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
242 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
245 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
248 sym = dlsym(ptr, symname);
251 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
252 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
258 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
266 if((dso == NULL) || (symname == NULL))
268 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
271 if(sk_void_num(dso->meth_data) < 1)
273 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
276 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
279 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
282 u.dlret = dlsym(ptr, symname);
285 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
286 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
292 static char *dlfcn_merger(DSO *dso, const char *filespec1,
293 const char *filespec2)
297 if(!filespec1 && !filespec2)
299 DSOerr(DSO_F_DLFCN_MERGER,
300 ERR_R_PASSED_NULL_PARAMETER);
303 /* If the first file specification is a rooted path, it rules.
304 same goes if the second file specification is missing. */
305 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/'))
307 merged = OPENSSL_malloc(strlen(filespec1) + 1);
310 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
313 strcpy(merged, filespec1);
315 /* If the first file specification is missing, the second one rules. */
318 merged = OPENSSL_malloc(strlen(filespec2) + 1);
321 DSOerr(DSO_F_DLFCN_MERGER,
322 ERR_R_MALLOC_FAILURE);
325 strcpy(merged, filespec2);
328 /* This part isn't as trivial as it looks. It assumes that
329 the second file specification really is a directory, and
330 makes no checks whatsoever. Therefore, the result becomes
331 the concatenation of filespec2 followed by a slash followed
336 spec2len = strlen(filespec2);
337 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
339 if(filespec2 && filespec2[spec2len - 1] == '/')
344 merged = OPENSSL_malloc(len + 2);
347 DSOerr(DSO_F_DLFCN_MERGER,
348 ERR_R_MALLOC_FAILURE);
351 strcpy(merged, filespec2);
352 merged[spec2len] = '/';
353 strcpy(&merged[spec2len + 1], filespec1);
358 #ifdef OPENSSL_SYS_MACOSX
359 #define DSO_ext ".dylib"
362 #define DSO_ext ".so"
367 static char *dlfcn_name_converter(DSO *dso, const char *filename)
370 int len, rsize, transform;
372 len = strlen(filename);
374 transform = (strstr(filename, "/") == NULL);
377 /* We will convert this to "%s.so" or "lib%s.so" etc */
378 rsize += DSO_extlen; /* The length of ".so" */
379 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
380 rsize += 3; /* The length of "lib" */
382 translated = OPENSSL_malloc(rsize);
383 if(translated == NULL)
385 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
386 DSO_R_NAME_TRANSLATION_FAILED);
391 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
392 sprintf(translated, "lib%s" DSO_ext, filename);
394 sprintf(translated, "%s" DSO_ext, filename);
397 sprintf(translated, "%s", filename);
403 This is a quote from IRIX manual for dladdr(3c):
405 <dlfcn.h> does not contain a prototype for dladdr or definition of
406 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
407 but contains no dladdr prototype and no IRIX library contains an
408 implementation. Write your own declaration based on the code below.
410 The following code is dependent on internal interfaces that are not
411 part of the IRIX compatibility guarantee; however, there is no future
412 intention to change this interface, so on a practical level, the code
413 below is safe to use on IRIX.
415 #include <rld_interface.h>
416 #ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
417 #define _RLD_INTERFACE_DLFCN_H_DLADDR
418 typedef struct Dl_info {
419 const char * dli_fname;
421 const char * dli_sname;
425 long dli_reserved[4];
428 typedef struct Dl_info Dl_info;
430 #define _RLD_DLADDR 14
432 static int dladdr(void *address, Dl_info *dl)
435 v = _rld_new_interface(_RLD_DLADDR,address,dl);
440 static int dlfcn_pathbyaddr(void *addr,char *path,int sz)
448 union { int(*f)(void*,char*,int); void *p; } t =
449 { dlfcn_pathbyaddr };
453 if (dladdr(addr,&dli))
455 len = (int)strlen(dli.dli_fname);
456 if (sz <= 0) return len+1;
457 if (len >= sz) len=sz-1;
458 memcpy(path,dli.dli_fname,len);
463 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
468 static void *dlfcn_globallookup(const char *name)
470 void *ret = NULL,*handle = dlopen(NULL,RTLD_LAZY);
474 ret = dlsym(handle,name);
480 #endif /* DSO_DLFCN */