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);
103 static DSO_METHOD dso_meth_dlfcn = {
104 "OpenSSL 'dlfcn' shared library method",
109 /* For now, "unbind" doesn't exist */
111 NULL, /* unbind_var */
112 NULL, /* unbind_func */
115 dlfcn_name_converter,
122 DSO_METHOD *DSO_METHOD_dlfcn(void)
124 return(&dso_meth_dlfcn);
127 /* Prior to using the dlopen() function, we should decide on the flag
128 * we send. There's a few different ways of doing this and it's a
129 * messy venn-diagram to match up which platforms support what. So
130 * as we don't have autoconf yet, I'm implementing a hack that could
131 * be hacked further relatively easily to deal with cases as we find
132 * them. Initially this is to cope with OpenBSD. */
133 #if defined(__OpenBSD__) || defined(__NetBSD__)
135 # define DLOPEN_FLAG DL_LAZY
138 # define DLOPEN_FLAG RTLD_NOW
140 # define DLOPEN_FLAG 0
144 # ifdef OPENSSL_SYS_SUNOS
145 # define DLOPEN_FLAG 1
147 # define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
151 /* For this DSO_METHOD, our meth_data STACK will contain;
152 * (i) the handle (void*) returned from dlopen().
155 static int dlfcn_load(DSO *dso)
158 /* See applicable comments in dso_dl.c */
159 char *filename = DSO_convert_filename(dso, NULL);
160 int flags = DLOPEN_FLAG;
164 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
169 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
170 flags |= RTLD_GLOBAL;
172 ptr = dlopen(filename, flags);
175 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
176 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
179 if(!sk_push(dso->meth_data, (char *)ptr))
181 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
185 dso->loaded_filename = filename;
190 OPENSSL_free(filename);
196 static int dlfcn_unload(DSO *dso)
201 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
204 if(sk_num(dso->meth_data) < 1)
206 ptr = (void *)sk_pop(dso->meth_data);
209 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
210 /* Should push the value back onto the stack in
211 * case of a retry. */
212 sk_push(dso->meth_data, (char *)ptr);
215 /* For now I'm not aware of any errors associated with dlclose() */
220 static void *dlfcn_bind_var(DSO *dso, const char *symname)
224 if((dso == NULL) || (symname == NULL))
226 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
229 if(sk_num(dso->meth_data) < 1)
231 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
234 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
237 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
240 sym = dlsym(ptr, symname);
243 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
244 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
250 static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
253 DSO_FUNC_TYPE sym, *tsym = &sym;
255 if((dso == NULL) || (symname == NULL))
257 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
260 if(sk_num(dso->meth_data) < 1)
262 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
265 ptr = (void *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
268 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
271 *(void **)(tsym) = dlsym(ptr, symname);
274 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
275 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
281 static char *dlfcn_merger(DSO *dso, const char *filespec1,
282 const char *filespec2)
286 if(!filespec1 && !filespec2)
288 DSOerr(DSO_F_DLFCN_MERGER,
289 ERR_R_PASSED_NULL_PARAMETER);
292 /* If the first file specification is a rooted path, it rules.
293 same goes if the second file specification is missing. */
294 if (!filespec2 || filespec1[0] == '/')
296 merged = OPENSSL_malloc(strlen(filespec1) + 1);
299 DSOerr(DSO_F_DLFCN_MERGER,
300 ERR_R_MALLOC_FAILURE);
303 strcpy(merged, filespec1);
305 /* If the first file specification is missing, the second one rules. */
308 merged = OPENSSL_malloc(strlen(filespec2) + 1);
311 DSOerr(DSO_F_DLFCN_MERGER,
312 ERR_R_MALLOC_FAILURE);
315 strcpy(merged, filespec2);
318 /* This part isn't as trivial as it looks. It assumes that
319 the second file specification really is a directory, and
320 makes no checks whatsoever. Therefore, the result becomes
321 the concatenation of filespec2 followed by a slash followed
326 spec2len = (filespec2 ? strlen(filespec2) : 0);
327 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
329 if(filespec2 && filespec2[spec2len - 1] == '/')
334 merged = OPENSSL_malloc(len + 2);
337 DSOerr(DSO_F_DLFCN_MERGER,
338 ERR_R_MALLOC_FAILURE);
341 strcpy(merged, filespec2);
342 merged[spec2len] = '/';
343 strcpy(&merged[spec2len + 1], filespec1);
348 static char *dlfcn_name_converter(DSO *dso, const char *filename)
351 int len, rsize, transform;
353 len = strlen(filename);
355 transform = (strstr(filename, "/") == NULL);
358 /* We will convert this to "%s.so" or "lib%s.so" */
359 rsize += 3; /* The length of ".so" */
360 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
361 rsize += 3; /* The length of "lib" */
363 translated = OPENSSL_malloc(rsize);
364 if(translated == NULL)
366 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
367 DSO_R_NAME_TRANSLATION_FAILED);
372 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
373 sprintf(translated, "lib%s.so", filename);
375 sprintf(translated, "%s.so", filename);
378 sprintf(translated, "%s", filename);
384 This is a quote from IRIX manual for dladdr(3c):
386 <dlfcn.h> does not contain a prototype for dladdr or definition of
387 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
388 but contains no dladdr prototype and no IRIX library contains an
389 implementation. Write your own declaration based on the code below.
391 The following code is dependent on internal interfaces that are not
392 part of the IRIX compatibility guarantee; however, there is no future
393 intention to change this interface, so on a practical level, the code
394 below is safe to use on IRIX.
396 #include <rld_interface.h>
397 #ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
398 #define _RLD_INTERFACE_DLFCN_H_DLADDR
399 typedef struct Dl_info {
400 const char * dli_fname;
402 const char * dli_sname;
406 long dli_reserved[4];
409 typedef struct Dl_info Dl_info;
411 #define _RLD_DLADDR 14
413 static int dladdr(void *address, Dl_info *dl)
416 v = _rld_new_interface(_RLD_DLADDR,address,dl);
421 static int dlfcn_pathbyaddr(void *addr,char *path,int sz)
428 union { int(*f)(void*,char*,int); void *p; } t =
429 { dlfcn_pathbyaddr };
433 if (dladdr(addr,&dli))
435 len = (int)strlen(dli.dli_fname);
436 if (sz <= 0) return len+1;
437 if (len >= sz) len=sz-1;
438 memcpy(path,dli.dli_fname,len);
443 ERR_add_error_data(4, "dlfcn_pathbyaddr(): ", dlerror());
446 #endif /* DSO_DLFCN */