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 */
67 # define HAVE_DLINFO 1
72 #include <openssl/dso.h>
75 DSO_METHOD *DSO_METHOD_dlfcn(void)
86 /* Part of the hack in "dlfcn_load" ... */
87 #define DSO_MAX_TRANSLATED_SIZE 256
89 static int dlfcn_load(DSO *dso);
90 static int dlfcn_unload(DSO *dso);
91 static void *dlfcn_bind_var(DSO *dso, const char *symname);
92 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
94 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
95 static int dlfcn_init(DSO *dso);
96 static int dlfcn_finish(DSO *dso);
97 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
99 static char *dlfcn_name_converter(DSO *dso, const char *filename);
100 static char *dlfcn_merger(DSO *dso, const char *filespec1,
101 const char *filespec2);
102 static int dlfcn_pathbyaddr(void *addr,char *path,int sz);
103 static void *dlfcn_globallookup(const char *name);
105 static DSO_METHOD dso_meth_dlfcn = {
106 "OpenSSL 'dlfcn' shared library method",
111 /* For now, "unbind" doesn't exist */
113 NULL, /* unbind_var */
114 NULL, /* unbind_func */
117 dlfcn_name_converter,
125 DSO_METHOD *DSO_METHOD_dlfcn(void)
127 return(&dso_meth_dlfcn);
130 /* Prior to using the dlopen() function, we should decide on the flag
131 * we send. There's a few different ways of doing this and it's a
132 * messy venn-diagram to match up which platforms support what. So
133 * as we don't have autoconf yet, I'm implementing a hack that could
134 * be hacked further relatively easily to deal with cases as we find
135 * them. Initially this is to cope with OpenBSD. */
136 #if defined(__OpenBSD__) || defined(__NetBSD__)
137 # define HAVE_DLINFO 1
139 # define DLOPEN_FLAG DL_LAZY
142 # define DLOPEN_FLAG RTLD_NOW
144 # define DLOPEN_FLAG 0
148 # ifdef OPENSSL_SYS_SUNOS
149 # define HAVE_DLINFO 1
150 # define DLOPEN_FLAG 1
152 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
156 /* For this DSO_METHOD, our meth_data STACK will contain;
157 * (i) the handle (void*) returned from dlopen().
160 static int dlfcn_load(DSO *dso)
163 /* See applicable comments in dso_dl.c */
164 char *filename = DSO_convert_filename(dso, NULL);
165 int flags = DLOPEN_FLAG;
169 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
174 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
175 flags |= RTLD_GLOBAL;
177 ptr = dlopen(filename, flags);
180 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
181 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
184 if(!sk_push(dso->meth_data, (char *)ptr))
186 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
190 dso->loaded_filename = filename;
195 OPENSSL_free(filename);
201 static int dlfcn_unload(DSO *dso)
206 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
209 if(sk_num(dso->meth_data) < 1)
211 ptr = (void *)sk_pop(dso->meth_data);
214 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
215 /* Should push the value back onto the stack in
216 * case of a retry. */
217 sk_push(dso->meth_data, (char *)ptr);
220 /* For now I'm not aware of any errors associated with dlclose() */
225 static void *dlfcn_bind_var(DSO *dso, const char *symname)
229 if((dso == NULL) || (symname == NULL))
231 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
234 if(sk_num(dso->meth_data) < 1)
236 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
239 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
242 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
245 sym = dlsym(ptr, symname);
248 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
249 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
255 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
258 DSO_FUNC_TYPE sym, *tsym = &sym;
260 if((dso == NULL) || (symname == NULL))
262 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
265 if(sk_num(dso->meth_data) < 1)
267 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
270 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
273 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
276 *(void **)(tsym) = dlsym(ptr, symname);
279 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
280 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
286 static char *dlfcn_merger(DSO *dso, const char *filespec1,
287 const char *filespec2)
291 if(!filespec1 && !filespec2)
293 DSOerr(DSO_F_DLFCN_MERGER,
294 ERR_R_PASSED_NULL_PARAMETER);
297 /* If the first file specification is a rooted path, it rules.
298 same goes if the second file specification is missing. */
299 if (!filespec2 || filespec1[0] == '/')
301 merged = OPENSSL_malloc(strlen(filespec1) + 1);
304 DSOerr(DSO_F_DLFCN_MERGER,
305 ERR_R_MALLOC_FAILURE);
308 strcpy(merged, filespec1);
310 /* If the first file specification is missing, the second one rules. */
313 merged = OPENSSL_malloc(strlen(filespec2) + 1);
316 DSOerr(DSO_F_DLFCN_MERGER,
317 ERR_R_MALLOC_FAILURE);
320 strcpy(merged, filespec2);
323 /* This part isn't as trivial as it looks. It assumes that
324 the second file specification really is a directory, and
325 makes no checks whatsoever. Therefore, the result becomes
326 the concatenation of filespec2 followed by a slash followed
331 spec2len = strlen(filespec2);
332 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
334 if(filespec2 && filespec2[spec2len - 1] == '/')
339 merged = OPENSSL_malloc(len + 2);
342 DSOerr(DSO_F_DLFCN_MERGER,
343 ERR_R_MALLOC_FAILURE);
346 strcpy(merged, filespec2);
347 merged[spec2len] = '/';
348 strcpy(&merged[spec2len + 1], filespec1);
353 static char *dlfcn_name_converter(DSO *dso, const char *filename)
356 int len, rsize, transform;
358 len = strlen(filename);
360 transform = (strstr(filename, "/") == NULL);
363 /* We will convert this to "%s.so" or "lib%s.so" */
364 rsize += 3; /* The length of ".so" */
365 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
366 rsize += 3; /* The length of "lib" */
368 translated = OPENSSL_malloc(rsize);
369 if(translated == NULL)
371 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
372 DSO_R_NAME_TRANSLATION_FAILED);
377 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
378 sprintf(translated, "lib%s.so", filename);
380 sprintf(translated, "%s.so", filename);
383 sprintf(translated, "%s", filename);
389 This is a quote from IRIX manual for dladdr(3c):
391 <dlfcn.h> does not contain a prototype for dladdr or definition of
392 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
393 but contains no dladdr prototype and no IRIX library contains an
394 implementation. Write your own declaration based on the code below.
396 The following code is dependent on internal interfaces that are not
397 part of the IRIX compatibility guarantee; however, there is no future
398 intention to change this interface, so on a practical level, the code
399 below is safe to use on IRIX.
401 #define HAVE_DLINFO 1
402 #include <rld_interface.h>
403 #ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
404 #define _RLD_INTERFACE_DLFCN_H_DLADDR
405 typedef struct Dl_info {
406 const char * dli_fname;
408 const char * dli_sname;
412 long dli_reserved[4];
415 typedef struct Dl_info Dl_info;
417 #define _RLD_DLADDR 14
419 static int dladdr(void *address, Dl_info *dl)
422 v = _rld_new_interface(_RLD_DLADDR,address,dl);
427 static int dlfcn_pathbyaddr(void *addr,char *path,int sz)
435 union { int(*f)(void*,char*,int); void *p; } t =
436 { dlfcn_pathbyaddr };
440 if (dladdr(addr,&dli))
442 len = (int)strlen(dli.dli_fname);
443 if (sz <= 0) return len+1;
444 if (len >= sz) len=sz-1;
445 memcpy(path,dli.dli_fname,len);
450 ERR_add_error_data(4, "dlfcn_pathbyaddr(): ", dlerror());
455 static void *dlfcn_globallookup(const char *name)
457 void *ret = NULL,*handle = dlopen(NULL,RTLD_LAZY);
461 ret = dlsym(handle,name);
467 #endif /* DSO_DLFCN */