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-
64 # define _GNU_SOURCE /* make sure dladdr is declared */
69 #include <openssl/dso.h>
72 DSO_METHOD *DSO_METHOD_dlfcn(void)
80 # define __EXTENSIONS__
83 # define HAVE_DLINFO 1
84 # if defined(_AIX) || defined(__CYGWIN__) || \
85 defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
86 (defined(__osf__) && !defined(RTLD_NEXT)) || \
87 (defined(__OpenBSD__) && !defined(RTLD_SELF)) || \
93 /* Part of the hack in "dlfcn_load" ... */
94 #define DSO_MAX_TRANSLATED_SIZE 256
96 static int dlfcn_load(DSO *dso);
97 static int dlfcn_unload(DSO *dso);
98 static void *dlfcn_bind_var(DSO *dso, const char *symname);
99 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
101 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
102 static int dlfcn_init(DSO *dso);
103 static int dlfcn_finish(DSO *dso);
104 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
106 static char *dlfcn_name_converter(DSO *dso, const char *filename);
107 static char *dlfcn_merger(DSO *dso, const char *filespec1,
108 const char *filespec2);
109 static int dlfcn_pathbyaddr(void *addr,char *path,int sz);
110 static void *dlfcn_globallookup(const char *name);
112 static DSO_METHOD dso_meth_dlfcn = {
113 "OpenSSL 'dlfcn' shared library method",
118 /* For now, "unbind" doesn't exist */
120 NULL, /* unbind_var */
121 NULL, /* unbind_func */
124 dlfcn_name_converter,
132 DSO_METHOD *DSO_METHOD_dlfcn(void)
134 return(&dso_meth_dlfcn);
137 /* Prior to using the dlopen() function, we should decide on the flag
138 * we send. There's a few different ways of doing this and it's a
139 * messy venn-diagram to match up which platforms support what. So
140 * as we don't have autoconf yet, I'm implementing a hack that could
141 * be hacked further relatively easily to deal with cases as we find
142 * them. Initially this is to cope with OpenBSD. */
143 #if defined(__OpenBSD__) || defined(__NetBSD__)
145 # define DLOPEN_FLAG DL_LAZY
148 # define DLOPEN_FLAG RTLD_NOW
150 # define DLOPEN_FLAG 0
154 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
157 /* For this DSO_METHOD, our meth_data STACK will contain;
158 * (i) the handle (void*) returned from dlopen().
161 static int dlfcn_load(DSO *dso)
164 /* See applicable comments in dso_dl.c */
165 char *filename = DSO_convert_filename(dso, NULL);
166 int flags = DLOPEN_FLAG;
170 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
175 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
176 flags |= RTLD_GLOBAL;
178 ptr = dlopen(filename, flags);
181 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
182 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
185 if(!sk_void_push(dso->meth_data, (char *)ptr))
187 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
191 dso->loaded_filename = filename;
196 OPENSSL_free(filename);
202 static int dlfcn_unload(DSO *dso)
207 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
210 if(sk_void_num(dso->meth_data) < 1)
212 ptr = sk_void_pop(dso->meth_data);
215 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
216 /* Should push the value back onto the stack in
217 * case of a retry. */
218 sk_void_push(dso->meth_data, ptr);
221 /* For now I'm not aware of any errors associated with dlclose() */
226 static void *dlfcn_bind_var(DSO *dso, const char *symname)
230 if((dso == NULL) || (symname == NULL))
232 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
235 if(sk_void_num(dso->meth_data) < 1)
237 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
240 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
243 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
246 sym = dlsym(ptr, symname);
249 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
250 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
256 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
264 if((dso == NULL) || (symname == NULL))
266 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
269 if(sk_void_num(dso->meth_data) < 1)
271 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
274 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
277 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
280 u.dlret = dlsym(ptr, symname);
283 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
284 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
290 static char *dlfcn_merger(DSO *dso, const char *filespec1,
291 const char *filespec2)
295 if(!filespec1 && !filespec2)
297 DSOerr(DSO_F_DLFCN_MERGER,
298 ERR_R_PASSED_NULL_PARAMETER);
301 /* If the first file specification is a rooted path, it rules.
302 same goes if the second file specification is missing. */
303 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/'))
305 merged = OPENSSL_malloc(strlen(filespec1) + 1);
308 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
311 strcpy(merged, filespec1);
313 /* If the first file specification is missing, the second one rules. */
316 merged = OPENSSL_malloc(strlen(filespec2) + 1);
319 DSOerr(DSO_F_DLFCN_MERGER,
320 ERR_R_MALLOC_FAILURE);
323 strcpy(merged, filespec2);
326 /* This part isn't as trivial as it looks. It assumes that
327 the second file specification really is a directory, and
328 makes no checks whatsoever. Therefore, the result becomes
329 the concatenation of filespec2 followed by a slash followed
334 spec2len = strlen(filespec2);
335 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
337 if(filespec2 && filespec2[spec2len - 1] == '/')
342 merged = OPENSSL_malloc(len + 2);
345 DSOerr(DSO_F_DLFCN_MERGER,
346 ERR_R_MALLOC_FAILURE);
349 strcpy(merged, filespec2);
350 merged[spec2len] = '/';
351 strcpy(&merged[spec2len + 1], filespec1);
356 #ifdef OPENSSL_SYS_MACOSX
357 #define DSO_ext ".dylib"
360 #define DSO_ext ".so"
365 static char *dlfcn_name_converter(DSO *dso, const char *filename)
368 int len, rsize, transform;
370 len = strlen(filename);
372 transform = (strstr(filename, "/") == NULL);
375 /* We will convert this to "%s.so" or "lib%s.so" etc */
376 rsize += DSO_extlen; /* The length of ".so" */
377 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
378 rsize += 3; /* The length of "lib" */
380 translated = OPENSSL_malloc(rsize);
381 if(translated == NULL)
383 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
384 DSO_R_NAME_TRANSLATION_FAILED);
389 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
390 sprintf(translated, "lib%s" DSO_ext, filename);
392 sprintf(translated, "%s" DSO_ext, filename);
395 sprintf(translated, "%s", filename);
401 This is a quote from IRIX manual for dladdr(3c):
403 <dlfcn.h> does not contain a prototype for dladdr or definition of
404 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
405 but contains no dladdr prototype and no IRIX library contains an
406 implementation. Write your own declaration based on the code below.
408 The following code is dependent on internal interfaces that are not
409 part of the IRIX compatibility guarantee; however, there is no future
410 intention to change this interface, so on a practical level, the code
411 below is safe to use on IRIX.
413 #include <rld_interface.h>
414 #ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
415 #define _RLD_INTERFACE_DLFCN_H_DLADDR
416 typedef struct Dl_info {
417 const char * dli_fname;
419 const char * dli_sname;
423 long dli_reserved[4];
426 typedef struct Dl_info Dl_info;
428 #define _RLD_DLADDR 14
430 static int dladdr(void *address, Dl_info *dl)
433 v = _rld_new_interface(_RLD_DLADDR,address,dl);
438 static int dlfcn_pathbyaddr(void *addr,char *path,int sz)
446 union { int(*f)(void*,char*,int); void *p; } t =
447 { dlfcn_pathbyaddr };
451 if (dladdr(addr,&dli))
453 len = (int)strlen(dli.dli_fname);
454 if (sz <= 0) return len+1;
455 if (len >= sz) len=sz-1;
456 memcpy(path,dli.dli_fname,len);
461 ERR_add_error_data(2, "dlfcn_pathbyaddr(): ", dlerror());
466 static void *dlfcn_globallookup(const char *name)
468 void *ret = NULL,*handle = dlopen(NULL,RTLD_LAZY);
472 ret = dlsym(handle,name);
478 #endif /* DSO_DLFCN */