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).
61 #include <openssl/dso.h>
64 DSO_METHOD *DSO_METHOD_dlfcn(void)
74 # define _GNU_SOURCE /* make sure dladdr is declared */
80 /* Part of the hack in "dlfcn_load" ... */
81 #define DSO_MAX_TRANSLATED_SIZE 256
83 static int dlfcn_load(DSO *dso);
84 static int dlfcn_unload(DSO *dso);
85 static void *dlfcn_bind_var(DSO *dso, const char *symname);
86 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
88 static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
89 static int dlfcn_init(DSO *dso);
90 static int dlfcn_finish(DSO *dso);
91 static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
93 static char *dlfcn_name_converter(DSO *dso, const char *filename);
94 static char *dlfcn_merger(DSO *dso, const char *filespec1,
95 const char *filespec2);
96 static int dlfcn_pathbyaddr(void *addr,char *path,int sz);
98 static DSO_METHOD dso_meth_dlfcn = {
99 "OpenSSL 'dlfcn' shared library method",
104 /* For now, "unbind" doesn't exist */
106 NULL, /* unbind_var */
107 NULL, /* unbind_func */
110 dlfcn_name_converter,
117 DSO_METHOD *DSO_METHOD_dlfcn(void)
119 return(&dso_meth_dlfcn);
122 /* Prior to using the dlopen() function, we should decide on the flag
123 * we send. There's a few different ways of doing this and it's a
124 * messy venn-diagram to match up which platforms support what. So
125 * as we don't have autoconf yet, I'm implementing a hack that could
126 * be hacked further relatively easily to deal with cases as we find
127 * them. Initially this is to cope with OpenBSD. */
128 #if defined(__OpenBSD__) || defined(__NetBSD__)
130 # define DLOPEN_FLAG DL_LAZY
133 # define DLOPEN_FLAG RTLD_NOW
135 # define DLOPEN_FLAG 0
139 # ifdef OPENSSL_SYS_SUNOS
140 # define DLOPEN_FLAG 1
142 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
146 /* For this DSO_METHOD, our meth_data STACK will contain;
147 * (i) the handle (void*) returned from dlopen().
150 static int dlfcn_load(DSO *dso)
153 /* See applicable comments in dso_dl.c */
154 char *filename = DSO_convert_filename(dso, NULL);
155 int flags = DLOPEN_FLAG;
159 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
164 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
165 flags |= RTLD_GLOBAL;
167 ptr = dlopen(filename, flags);
170 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
171 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
174 if(!sk_push(dso->meth_data, (char *)ptr))
176 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
180 dso->loaded_filename = filename;
185 OPENSSL_free(filename);
191 static int dlfcn_unload(DSO *dso)
196 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
199 if(sk_num(dso->meth_data) < 1)
201 ptr = (void *)sk_pop(dso->meth_data);
204 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
205 /* Should push the value back onto the stack in
206 * case of a retry. */
207 sk_push(dso->meth_data, (char *)ptr);
210 /* For now I'm not aware of any errors associated with dlclose() */
215 static void *dlfcn_bind_var(DSO *dso, const char *symname)
219 if((dso == NULL) || (symname == NULL))
221 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
224 if(sk_num(dso->meth_data) < 1)
226 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
229 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
232 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
235 sym = dlsym(ptr, symname);
238 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
239 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
245 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
248 DSO_FUNC_TYPE sym, *tsym = &sym;
250 if((dso == NULL) || (symname == NULL))
252 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
255 if(sk_num(dso->meth_data) < 1)
257 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
260 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
263 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
266 *(void **)(tsym) = dlsym(ptr, symname);
269 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
270 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
276 static char *dlfcn_merger(DSO *dso, const char *filespec1,
277 const char *filespec2)
281 if(!filespec1 && !filespec2)
283 DSOerr(DSO_F_DLFCN_MERGER,
284 ERR_R_PASSED_NULL_PARAMETER);
287 /* If the first file specification is a rooted path, it rules.
288 same goes if the second file specification is missing. */
289 if (!filespec2 || filespec1[0] == '/')
291 merged = OPENSSL_malloc(strlen(filespec1) + 1);
294 DSOerr(DSO_F_DLFCN_MERGER,
295 ERR_R_MALLOC_FAILURE);
298 strcpy(merged, filespec1);
300 /* If the first file specification is missing, the second one rules. */
303 merged = OPENSSL_malloc(strlen(filespec2) + 1);
306 DSOerr(DSO_F_DLFCN_MERGER,
307 ERR_R_MALLOC_FAILURE);
310 strcpy(merged, filespec2);
313 /* This part isn't as trivial as it looks. It assumes that
314 the second file specification really is a directory, and
315 makes no checks whatsoever. Therefore, the result becomes
316 the concatenation of filespec2 followed by a slash followed
321 spec2len = (filespec2 ? strlen(filespec2) : 0);
322 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
324 if(filespec2 && filespec2[spec2len - 1] == '/')
329 merged = OPENSSL_malloc(len + 2);
332 DSOerr(DSO_F_DLFCN_MERGER,
333 ERR_R_MALLOC_FAILURE);
336 strcpy(merged, filespec2);
337 merged[spec2len] = '/';
338 strcpy(&merged[spec2len + 1], filespec1);
343 static char *dlfcn_name_converter(DSO *dso, const char *filename)
346 int len, rsize, transform;
348 len = strlen(filename);
350 transform = (strstr(filename, "/") == NULL);
353 /* We will convert this to "%s.so" or "lib%s.so" */
354 rsize += 3; /* The length of ".so" */
355 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
356 rsize += 3; /* The length of "lib" */
358 translated = OPENSSL_malloc(rsize);
359 if(translated == NULL)
361 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
362 DSO_R_NAME_TRANSLATION_FAILED);
367 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
368 sprintf(translated, "lib%s.so", filename);
370 sprintf(translated, "%s.so", filename);
373 sprintf(translated, "%s", filename);
379 This is a quote from IRIX manual for dladdr(3c):
381 <dlfcn.h> does not contain a prototype for dladdr or definition of
382 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
383 but contains no dladdr prototype and no IRIX library contains an
384 implementation. Write your own declaration based on the code below.
386 The following code is dependent on internal interfaces that are not
387 part of the IRIX compatibility guarantee; however, there is no future
388 intention to change this interface, so on a practical level, the code
389 below is safe to use on IRIX.
391 #include <rld_interface.h>
392 #ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
393 #define _RLD_INTERFACE_DLFCN_H_DLADDR
394 typedef struct Dl_info {
395 const char * dli_fname;
397 const char * dli_sname;
401 long dli_reserved[4];
404 typedef struct Dl_info Dl_info;
406 #define _RLD_DLADDR 14
408 static int dladdr(void *address, Dl_info *dl)
411 v = _rld_new_interface(_RLD_DLADDR,address,dl);
416 static int dlfcn_pathbyaddr(void *addr,char *path,int sz)
421 if (addr == NULL) addr = dlfcn_pathbyaddr;
423 if (dladdr(addr,&dli))
425 len = (int)strlen(dli.dli_fname);
426 if (sz <= 0) return len+1;
427 if (len >= sz) len=sz-1;
428 memcpy(path,dli.dli_fname,len);
433 ERR_add_error_data(4, "dlfcn_pathbyaddr(): ", dlerror());
436 #endif /* DSO_DLFCN */