Import OpenSSL-1.0.0g.
[dragonfly.git] / crypto / openssl / crypto / dso / dso_dlfcn.c
CommitLineData
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1/* dso_dlfcn.c -*- mode:C; c-file-style: "eay" -*- */
2/* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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
18 * distribution.
19 *
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/)"
24 *
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.
29 *
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.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
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 * ====================================================================
52 *
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).
56 *
57 */
58
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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-
62 inclusion. */
63#ifdef __linux
64# ifndef _GNU_SOURCE
65# define _GNU_SOURCE /* make sure dladdr is declared */
66# endif
67#endif
68
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69#include <stdio.h>
70#include "cryptlib.h"
71#include <openssl/dso.h>
72
73#ifndef DSO_DLFCN
74DSO_METHOD *DSO_METHOD_dlfcn(void)
75 {
76 return NULL;
77 }
78#else
79
80#ifdef HAVE_DLFCN_H
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81# ifdef __osf__
82# define __EXTENSIONS__
83# endif
84# include <dlfcn.h>
85# define HAVE_DLINFO 1
86# if defined(_AIX) || defined(__CYGWIN__) || \
87 defined(__SCO_VERSION__) || defined(_SCO_ELF) || \
22a79287 88 (defined(__osf__) && !defined(RTLD_NEXT)) || \
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89 (defined(__OpenBSD__) && !defined(RTLD_SELF))
90# undef HAVE_DLINFO
91# endif
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92#endif
93
94/* Part of the hack in "dlfcn_load" ... */
95#define DSO_MAX_TRANSLATED_SIZE 256
96
97static int dlfcn_load(DSO *dso);
98static int dlfcn_unload(DSO *dso);
99static void *dlfcn_bind_var(DSO *dso, const char *symname);
100static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname);
101#if 0
102static int dlfcn_unbind(DSO *dso, char *symname, void *symptr);
103static int dlfcn_init(DSO *dso);
104static int dlfcn_finish(DSO *dso);
105static long dlfcn_ctrl(DSO *dso, int cmd, long larg, void *parg);
106#endif
107static char *dlfcn_name_converter(DSO *dso, const char *filename);
108static char *dlfcn_merger(DSO *dso, const char *filespec1,
109 const char *filespec2);
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110static int dlfcn_pathbyaddr(void *addr,char *path,int sz);
111static void *dlfcn_globallookup(const char *name);
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112
113static DSO_METHOD dso_meth_dlfcn = {
114 "OpenSSL 'dlfcn' shared library method",
115 dlfcn_load,
116 dlfcn_unload,
117 dlfcn_bind_var,
118 dlfcn_bind_func,
119/* For now, "unbind" doesn't exist */
120#if 0
121 NULL, /* unbind_var */
122 NULL, /* unbind_func */
123#endif
124 NULL, /* ctrl */
125 dlfcn_name_converter,
126 dlfcn_merger,
127 NULL, /* init */
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128 NULL, /* finish */
129 dlfcn_pathbyaddr,
130 dlfcn_globallookup
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131 };
132
133DSO_METHOD *DSO_METHOD_dlfcn(void)
134 {
135 return(&dso_meth_dlfcn);
136 }
137
138/* Prior to using the dlopen() function, we should decide on the flag
139 * we send. There's a few different ways of doing this and it's a
140 * messy venn-diagram to match up which platforms support what. So
141 * as we don't have autoconf yet, I'm implementing a hack that could
142 * be hacked further relatively easily to deal with cases as we find
143 * them. Initially this is to cope with OpenBSD. */
144#if defined(__OpenBSD__) || defined(__NetBSD__)
145# ifdef DL_LAZY
146# define DLOPEN_FLAG DL_LAZY
147# else
148# ifdef RTLD_NOW
149# define DLOPEN_FLAG RTLD_NOW
150# else
151# define DLOPEN_FLAG 0
152# endif
153# endif
154#else
155# ifdef OPENSSL_SYS_SUNOS
156# define DLOPEN_FLAG 1
157# else
158# define DLOPEN_FLAG RTLD_NOW /* Hope this works everywhere else */
159# endif
160#endif
161
162/* For this DSO_METHOD, our meth_data STACK will contain;
163 * (i) the handle (void*) returned from dlopen().
164 */
165
166static int dlfcn_load(DSO *dso)
167 {
168 void *ptr = NULL;
169 /* See applicable comments in dso_dl.c */
170 char *filename = DSO_convert_filename(dso, NULL);
171 int flags = DLOPEN_FLAG;
172
173 if(filename == NULL)
174 {
175 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_NO_FILENAME);
176 goto err;
177 }
178
179#ifdef RTLD_GLOBAL
180 if (dso->flags & DSO_FLAG_GLOBAL_SYMBOLS)
181 flags |= RTLD_GLOBAL;
182#endif
183 ptr = dlopen(filename, flags);
184 if(ptr == NULL)
185 {
186 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_LOAD_FAILED);
187 ERR_add_error_data(4, "filename(", filename, "): ", dlerror());
188 goto err;
189 }
919b01cc 190 if(!sk_void_push(dso->meth_data, (char *)ptr))
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191 {
192 DSOerr(DSO_F_DLFCN_LOAD,DSO_R_STACK_ERROR);
193 goto err;
194 }
195 /* Success */
196 dso->loaded_filename = filename;
197 return(1);
198err:
199 /* Cleanup! */
200 if(filename != NULL)
201 OPENSSL_free(filename);
202 if(ptr != NULL)
203 dlclose(ptr);
204 return(0);
205}
206
207static int dlfcn_unload(DSO *dso)
208 {
209 void *ptr;
210 if(dso == NULL)
211 {
212 DSOerr(DSO_F_DLFCN_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
213 return(0);
214 }
919b01cc 215 if(sk_void_num(dso->meth_data) < 1)
56276539 216 return(1);
919b01cc 217 ptr = sk_void_pop(dso->meth_data);
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218 if(ptr == NULL)
219 {
220 DSOerr(DSO_F_DLFCN_UNLOAD,DSO_R_NULL_HANDLE);
221 /* Should push the value back onto the stack in
222 * case of a retry. */
919b01cc 223 sk_void_push(dso->meth_data, ptr);
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224 return(0);
225 }
226 /* For now I'm not aware of any errors associated with dlclose() */
227 dlclose(ptr);
228 return(1);
229 }
230
231static void *dlfcn_bind_var(DSO *dso, const char *symname)
232 {
233 void *ptr, *sym;
234
235 if((dso == NULL) || (symname == NULL))
236 {
237 DSOerr(DSO_F_DLFCN_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
238 return(NULL);
239 }
919b01cc 240 if(sk_void_num(dso->meth_data) < 1)
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241 {
242 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_STACK_ERROR);
243 return(NULL);
244 }
919b01cc 245 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
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246 if(ptr == NULL)
247 {
248 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_NULL_HANDLE);
249 return(NULL);
250 }
251 sym = dlsym(ptr, symname);
252 if(sym == NULL)
253 {
254 DSOerr(DSO_F_DLFCN_BIND_VAR,DSO_R_SYM_FAILURE);
255 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
256 return(NULL);
257 }
258 return(sym);
259 }
260
261static DSO_FUNC_TYPE dlfcn_bind_func(DSO *dso, const char *symname)
262 {
263 void *ptr;
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264 union {
265 DSO_FUNC_TYPE sym;
266 void *dlret;
267 } u;
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268
269 if((dso == NULL) || (symname == NULL))
270 {
271 DSOerr(DSO_F_DLFCN_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
272 return(NULL);
273 }
919b01cc 274 if(sk_void_num(dso->meth_data) < 1)
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275 {
276 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_STACK_ERROR);
277 return(NULL);
278 }
919b01cc 279 ptr = sk_void_value(dso->meth_data, sk_void_num(dso->meth_data) - 1);
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280 if(ptr == NULL)
281 {
282 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_NULL_HANDLE);
283 return(NULL);
284 }
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285 u.dlret = dlsym(ptr, symname);
286 if(u.dlret == NULL)
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287 {
288 DSOerr(DSO_F_DLFCN_BIND_FUNC,DSO_R_SYM_FAILURE);
289 ERR_add_error_data(4, "symname(", symname, "): ", dlerror());
290 return(NULL);
291 }
5f042374 292 return u.sym;
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293 }
294
295static char *dlfcn_merger(DSO *dso, const char *filespec1,
296 const char *filespec2)
297 {
298 char *merged;
299
300 if(!filespec1 && !filespec2)
301 {
302 DSOerr(DSO_F_DLFCN_MERGER,
303 ERR_R_PASSED_NULL_PARAMETER);
304 return(NULL);
305 }
306 /* If the first file specification is a rooted path, it rules.
307 same goes if the second file specification is missing. */
919b01cc 308 if (!filespec2 || (filespec1 != NULL && filespec1[0] == '/'))
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309 {
310 merged = OPENSSL_malloc(strlen(filespec1) + 1);
311 if(!merged)
312 {
919b01cc 313 DSOerr(DSO_F_DLFCN_MERGER, ERR_R_MALLOC_FAILURE);
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314 return(NULL);
315 }
316 strcpy(merged, filespec1);
317 }
318 /* If the first file specification is missing, the second one rules. */
319 else if (!filespec1)
320 {
321 merged = OPENSSL_malloc(strlen(filespec2) + 1);
322 if(!merged)
323 {
324 DSOerr(DSO_F_DLFCN_MERGER,
325 ERR_R_MALLOC_FAILURE);
326 return(NULL);
327 }
328 strcpy(merged, filespec2);
329 }
330 else
331 /* This part isn't as trivial as it looks. It assumes that
332 the second file specification really is a directory, and
333 makes no checks whatsoever. Therefore, the result becomes
334 the concatenation of filespec2 followed by a slash followed
335 by filespec1. */
336 {
337 int spec2len, len;
338
919b01cc 339 spec2len = strlen(filespec2);
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340 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
341
342 if(filespec2 && filespec2[spec2len - 1] == '/')
343 {
344 spec2len--;
345 len--;
346 }
347 merged = OPENSSL_malloc(len + 2);
348 if(!merged)
349 {
350 DSOerr(DSO_F_DLFCN_MERGER,
351 ERR_R_MALLOC_FAILURE);
352 return(NULL);
353 }
354 strcpy(merged, filespec2);
355 merged[spec2len] = '/';
356 strcpy(&merged[spec2len + 1], filespec1);
357 }
358 return(merged);
359 }
360
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361#ifdef OPENSSL_SYS_MACOSX
362#define DSO_ext ".dylib"
363#define DSO_extlen 6
364#else
365#define DSO_ext ".so"
366#define DSO_extlen 3
367#endif
368
369
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370static char *dlfcn_name_converter(DSO *dso, const char *filename)
371 {
372 char *translated;
373 int len, rsize, transform;
374
375 len = strlen(filename);
376 rsize = len + 1;
377 transform = (strstr(filename, "/") == NULL);
378 if(transform)
379 {
5f042374
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380 /* We will convert this to "%s.so" or "lib%s.so" etc */
381 rsize += DSO_extlen; /* The length of ".so" */
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382 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
383 rsize += 3; /* The length of "lib" */
384 }
385 translated = OPENSSL_malloc(rsize);
386 if(translated == NULL)
387 {
388 DSOerr(DSO_F_DLFCN_NAME_CONVERTER,
389 DSO_R_NAME_TRANSLATION_FAILED);
390 return(NULL);
391 }
392 if(transform)
393 {
394 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
5f042374 395 sprintf(translated, "lib%s" DSO_ext, filename);
56276539 396 else
5f042374 397 sprintf(translated, "%s" DSO_ext, filename);
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398 }
399 else
400 sprintf(translated, "%s", filename);
401 return(translated);
402 }
403
919b01cc
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404#ifdef __sgi
405/*
406This is a quote from IRIX manual for dladdr(3c):
407
408 <dlfcn.h> does not contain a prototype for dladdr or definition of
409 Dl_info. The #include <dlfcn.h> in the SYNOPSIS line is traditional,
410 but contains no dladdr prototype and no IRIX library contains an
411 implementation. Write your own declaration based on the code below.
412
413 The following code is dependent on internal interfaces that are not
414 part of the IRIX compatibility guarantee; however, there is no future
415 intention to change this interface, so on a practical level, the code
416 below is safe to use on IRIX.
417*/
418#include <rld_interface.h>
419#ifndef _RLD_INTERFACE_DLFCN_H_DLADDR
420#define _RLD_INTERFACE_DLFCN_H_DLADDR
421typedef struct Dl_info {
422 const char * dli_fname;
423 void * dli_fbase;
424 const char * dli_sname;
425 void * dli_saddr;
426 int dli_version;
427 int dli_reserved1;
428 long dli_reserved[4];
429} Dl_info;
430#else
431typedef struct Dl_info Dl_info;
432#endif
433#define _RLD_DLADDR 14
434
435static int dladdr(void *address, Dl_info *dl)
436{
437 void *v;
438 v = _rld_new_interface(_RLD_DLADDR,address,dl);
439 return (int)v;
440}
441#endif /* __sgi */
442
443static int dlfcn_pathbyaddr(void *addr,char *path,int sz)
444 {
445#ifdef HAVE_DLINFO
446 Dl_info dli;
447 int len;
448
449 if (addr == NULL)
450 {
451 union { int(*f)(void*,char*,int); void *p; } t =
452 { dlfcn_pathbyaddr };
453 addr = t.p;
454 }
455
456 if (dladdr(addr,&dli))
457 {
458 len = (int)strlen(dli.dli_fname);
459 if (sz <= 0) return len+1;
460 if (len >= sz) len=sz-1;
461 memcpy(path,dli.dli_fname,len);
462 path[len++]=0;
463 return len;
464 }
465
466 ERR_add_error_data(4, "dlfcn_pathbyaddr(): ", dlerror());
467#endif
468 return -1;
469 }
470
471static void *dlfcn_globallookup(const char *name)
472 {
473 void *ret = NULL,*handle = dlopen(NULL,RTLD_LAZY);
474
475 if (handle)
476 {
477 ret = dlsym(handle,name);
478 dlclose(handle);
479 }
480
481 return ret;
482 }
56276539 483#endif /* DSO_DLFCN */