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)
85 /* Part of the hack in "dlfcn_load" ... */
86 #define DSO_MAX_TRANSLATED_SIZE 256
88 static int dlfcn_load(DSO *dso);
89 static int dlfcn_unload(DSO *dso);
90 static void *dlfcn_bind_var(DSO *dso, const char *symname);
91 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
93 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
94 static int dlfcn_init(DSO *dso);
95 static int dlfcn_finish(DSO *dso);
96 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
98 static char *dlfcn_name_converter(DSO *dso, const char *filename);
99 static char *dlfcn_merger(DSO *dso, const char *filespec1,
100 const char *filespec2);
101 static int dlfcn_pathbyaddr(void *addr,char *path,int sz);
102 static void *dlfcn_globallookup(const char *name);
104 static DSO_METHOD dso_meth_dlfcn = {
105 "OpenSSL 'dlfcn' shared library method",
110 /* For now, "unbind" doesn't exist */
112 NULL, /* unbind_var */
113 NULL, /* unbind_func */
116 dlfcn_name_converter,
124 DSO_METHOD *DSO_METHOD_dlfcn(void)
126 return(&dso_meth_dlfcn);
129 /* Prior to using the dlopen() function, we should decide on the flag
130 * we send. There's a few different ways of doing this and it's a
131 * messy venn-diagram to match up which platforms support what. So
132 * as we don't have autoconf yet, I'm implementing a hack that could
133 * be hacked further relatively easily to deal with cases as we find
134 * them. Initially this is to cope with OpenBSD. */
135 #if defined(__OpenBSD__) || defined(__NetBSD__)
137 # define DLOPEN_FLAG DL_LAZY
140 # define DLOPEN_FLAG RTLD_NOW
142 # define DLOPEN_FLAG 0
146 # ifdef OPENSSL_SYS_SUNOS
147 # define DLOPEN_FLAG 1
149 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
153 /* For this DSO_METHOD, our meth_data STACK will contain;
154 * (i) the handle (void*) returned from dlopen().
157 static int dlfcn_load(DSO *dso)
160 /* See applicable comments in dso_dl.c */
161 char *filename = DSO_convert_filename(dso, NULL);
162 int flags = DLOPEN_FLAG;
166 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
171 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
172 flags |= RTLD_GLOBAL;
174 ptr = dlopen(filename, flags);
177 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
178 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
181 if(!sk_push(dso->meth_data, (char *)ptr))
183 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
187 dso->loaded_filename = filename;
192 OPENSSL_free(filename);
198 static int dlfcn_unload(DSO *dso)
203 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
206 if(sk_num(dso->meth_data) < 1)
208 ptr = (void *)sk_pop(dso->meth_data);
211 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
212 /* Should push the value back onto the stack in
213 * case of a retry. */
214 sk_push(dso->meth_data, (char *)ptr);
217 /* For now I'm not aware of any errors associated with dlclose() */
222 static void *dlfcn_bind_var(DSO *dso, const char *symname)
226 if((dso == NULL) || (symname == NULL))
228 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
231 if(sk_num(dso->meth_data) < 1)
233 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
236 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
239 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
242 sym = dlsym(ptr, symname);
245 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
246 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
252 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
255 DSO_FUNC_TYPE sym, *tsym = &sym;
257 if((dso == NULL) || (symname == NULL))
259 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
262 if(sk_num(dso->meth_data) < 1)
264 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
267 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
270 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
273 *(void **)(tsym) = dlsym(ptr, symname);
276 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
277 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
283 static char *dlfcn_merger(DSO *dso, const char *filespec1,
284 const char *filespec2)
288 if(!filespec1 && !filespec2)
290 DSOerr(DSO_F_DLFCN_MERGER,
291 ERR_R_PASSED_NULL_PARAMETER);
294 /* If the first file specification is a rooted path, it rules.
295 same goes if the second file specification is missing. */
296 if (!filespec2 || filespec1[0] == '/')
298 merged = OPENSSL_malloc(strlen(filespec1) + 1);
301 DSOerr(DSO_F_DLFCN_MERGER,
302 ERR_R_MALLOC_FAILURE);
305 strcpy(merged, filespec1);
307 /* If the first file specification is missing, the second one rules. */
310 merged = OPENSSL_malloc(strlen(filespec2) + 1);
313 DSOerr(DSO_F_DLFCN_MERGER,
314 ERR_R_MALLOC_FAILURE);
317 strcpy(merged, filespec2);
320 /* This part isn't as trivial as it looks. It assumes that
321 the second file specification really is a directory, and
322 makes no checks whatsoever. Therefore, the result becomes
323 the concatenation of filespec2 followed by a slash followed
328 spec2len = strlen(filespec2);
329 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
331 if(filespec2 && filespec2[spec2len - 1] == '/')
336 merged = OPENSSL_malloc(len + 2);
339 DSOerr(DSO_F_DLFCN_MERGER,
340 ERR_R_MALLOC_FAILURE);
343 strcpy(merged, filespec2);
344 merged[spec2len] = '/';
345 strcpy(&merged[spec2len + 1], filespec1);
350 static char *dlfcn_name_converter(DSO *dso, const char *filename)
353 int len, rsize, transform;
355 len = strlen(filename);
357 transform = (strstr(filename, "/") == NULL);
360 /* We will convert this to "%s.so" or "lib%s.so" */
361 rsize += 3; /* The length of ".so" */
362 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
363 rsize += 3; /* The length of "lib" */
365 translated = OPENSSL_malloc(rsize);
366 if(translated == NULL)
368 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
369 DSO_R_NAME_TRANSLATION_FAILED);
374 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
375 sprintf(translated, "lib%s.so", filename);
377 sprintf(translated, "%s.so", filename);
380 sprintf(translated, "%s", filename);
386 This is a quote from IRIX manual for dladdr(3c):
388 <dlfcn.h> does not contain a prototype for dladdr or definition of
389 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
390 but contains no dladdr prototype and no IRIX library contains an
391 implementation. Write your own declaration based on the code below.
393 The following code is dependent on internal interfaces that are not
394 part of the IRIX compatibility guarantee; however, there is no future
395 intention to change this interface, so on a practical level, the code
396 below is safe to use on IRIX.
398 #include <rld_interface.h>
399 #ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
400 #define _RLD_INTERFACE_DLFCN_H_DLADDR
401 typedef struct Dl_info {
402 const char * dli_fname;
404 const char * dli_sname;
408 long dli_reserved[4];
411 typedef struct Dl_info Dl_info;
413 #define _RLD_DLADDR 14
415 static int dladdr(void *address, Dl_info *dl)
418 v = _rld_new_interface(_RLD_DLADDR,address,dl);
423 static int dlfcn_pathbyaddr(void *addr,char *path,int sz)
431 union { int(*f)(void*,char*,int); void *p; } t =
432 { dlfcn_pathbyaddr };
436 if (dladdr(addr,&dli))
438 len = (int)strlen(dli.dli_fname);
439 if (sz <= 0) return len+1;
440 if (len >= sz) len=sz-1;
441 memcpy(path,dli.dli_fname,len);
446 ERR_add_error_data(4, "dlfcn_pathbyaddr(): ", dlerror());
451 static void *dlfcn_globallookup(const char *name)
453 void *ret = NULL,*handle = dlopen(NULL,RTLD_LAZY);
457 ret = dlsym(handle,name);
463 #endif /* DSO_DLFCN */