1 /* dso_dl.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Written by Richard Levitte (richard@levitte.org) 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/)"
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30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
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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
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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_dl(void)
72 /* Part of the hack in "dl_load" ... */
73 #define DSO_MAX_TRANSLATED_SIZE 256
75 static int dl_load(DSO *dso);
76 static int dl_unload(DSO *dso);
77 static void *dl_bind_var(DSO *dso, const char *symname);
78 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
80 static int dl_unbind_var(DSO *dso, char *symname, void *symptr);
81 static int dl_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
82 static int dl_init(DSO *dso);
83 static int dl_finish(DSO *dso);
84 static int dl_ctrl(DSO *dso, int cmd, long larg, void *parg);
86 static char *dl_name_converter(DSO *dso, const char *filename);
87 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2);
88 static int dl_pathbyaddr(void *addr,char *path,int sz);
90 static DSO_METHOD dso_meth_dl = {
91 "OpenSSL 'dl' shared library method",
96 /* For now, "unbind" doesn't exist */
98 NULL, /* unbind_var */
99 NULL, /* unbind_func */
109 DSO_METHOD *DSO_METHOD_dl(void)
111 return(&dso_meth_dl);
114 /* For this DSO_METHOD, our meth_data STACK will contain;
115 * (i) the handle (shl_t) returned from shl_load().
116 * NB: I checked on HPUX11 and shl_t is itself a pointer
117 * type so the cast is safe.
120 static int dl_load(DSO *dso)
123 /* We don't do any fancy retries or anything, just take the method's
124 * (or DSO's if it has the callback set) best translation of the
125 * platform-independant filename and try once with that. */
126 char *filename= DSO_convert_filename(dso, NULL);
130 DSOerr(DSO_F_DL_LOAD,DSO_R_NO_FILENAME);
133 ptr = shl_load(filename, BIND_IMMEDIATE |
134 (dso->flags&DSO_FLAG_NO_NAME_TRANSLATION?0:DYNAMIC_PATH), 0L);
137 DSOerr(DSO_F_DL_LOAD,DSO_R_LOAD_FAILED);
138 ERR_add_error_data(4, "filename(", filename, "): ",
142 if(!sk_push(dso->meth_data, (char *)ptr))
144 DSOerr(DSO_F_DL_LOAD,DSO_R_STACK_ERROR);
147 /* Success, stick the converted filename we've loaded under into the DSO
148 * (it also serves as the indicator that we are currently loaded). */
149 dso->loaded_filename = filename;
154 OPENSSL_free(filename);
160 static int dl_unload(DSO *dso)
165 DSOerr(DSO_F_DL_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
168 if(sk_num(dso->meth_data) < 1)
170 /* Is this statement legal? */
171 ptr = (shl_t)sk_pop(dso->meth_data);
174 DSOerr(DSO_F_DL_UNLOAD,DSO_R_NULL_HANDLE);
175 /* Should push the value back onto the stack in
176 * case of a retry. */
177 sk_push(dso->meth_data, (char *)ptr);
184 static void *dl_bind_var(DSO *dso, const char *symname)
189 if((dso == NULL) || (symname == NULL))
191 DSOerr(DSO_F_DL_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
194 if(sk_num(dso->meth_data) < 1)
196 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_STACK_ERROR);
199 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
202 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_NULL_HANDLE);
205 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0)
207 DSOerr(DSO_F_DL_BIND_VAR,DSO_R_SYM_FAILURE);
208 ERR_add_error_data(4, "symname(", symname, "): ",
215 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
220 if((dso == NULL) || (symname == NULL))
222 DSOerr(DSO_F_DL_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
225 if(sk_num(dso->meth_data) < 1)
227 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_STACK_ERROR);
230 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
233 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_NULL_HANDLE);
236 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0)
238 DSOerr(DSO_F_DL_BIND_FUNC,DSO_R_SYM_FAILURE);
239 ERR_add_error_data(4, "symname(", symname, "): ",
243 return((DSO_FUNC_TYPE)sym);
246 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
250 if(!filespec1 && !filespec2)
252 DSOerr(DSO_F_DL_MERGER,
253 ERR_R_PASSED_NULL_PARAMETER);
256 /* If the first file specification is a rooted path, it rules.
257 same goes if the second file specification is missing. */
258 if (!filespec2 || filespec1[0] == '/')
260 merged = OPENSSL_malloc(strlen(filespec1) + 1);
263 DSOerr(DSO_F_DL_MERGER,
264 ERR_R_MALLOC_FAILURE);
267 strcpy(merged, filespec1);
269 /* If the first file specification is missing, the second one rules. */
272 merged = OPENSSL_malloc(strlen(filespec2) + 1);
275 DSOerr(DSO_F_DL_MERGER,
276 ERR_R_MALLOC_FAILURE);
279 strcpy(merged, filespec2);
282 /* This part isn't as trivial as it looks. It assumes that
283 the second file specification really is a directory, and
284 makes no checks whatsoever. Therefore, the result becomes
285 the concatenation of filespec2 followed by a slash followed
290 spec2len = (filespec2 ? strlen(filespec2) : 0);
291 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
293 if(filespec2 && filespec2[spec2len - 1] == '/')
298 merged = OPENSSL_malloc(len + 2);
301 DSOerr(DSO_F_DL_MERGER,
302 ERR_R_MALLOC_FAILURE);
305 strcpy(merged, filespec2);
306 merged[spec2len] = '/';
307 strcpy(&merged[spec2len + 1], filespec1);
312 /* This function is identical to the one in dso_dlfcn.c, but as it is highly
313 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at the
314 * same time, there's no great duplicating the code. Figuring out an elegant
315 * way to share one copy of the code would be more difficult and would not
316 * leave the implementations independant. */
318 static const char extension[] = ".sl";
320 static const char extension[] = ".so";
322 static char *dl_name_converter(DSO *dso, const char *filename)
325 int len, rsize, transform;
327 len = strlen(filename);
329 transform = (strstr(filename, "/") == NULL);
331 /* We will convert this to "%s.s?" or "lib%s.s?" */
332 rsize += strlen(extension);/* The length of ".s?" */
333 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
334 rsize += 3; /* The length of "lib" */
336 translated = OPENSSL_malloc(rsize);
337 if(translated == NULL)
339 DSOerr(DSO_F_DL_NAME_CONVERTER,
340 DSO_R_NAME_TRANSLATION_FAILED);
345 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
346 sprintf(translated, "lib%s%s", filename, extension);
348 sprintf(translated, "%s%s", filename, extension);
351 sprintf(translated, "%s", filename);
355 static int dl_pathbyaddr(void *addr,char *path,int sz)
357 struct shl_descriptor inf;
362 union { int(*f)(void*,char*,int); void *p; } t =
367 for (i=-1;shl_get_r(i,&inf)==0;i++)
369 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
370 ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend))
372 len = (int)strlen(inf.filename);
373 if (sz <= 0) return len+1;
374 if (len >= sz) len=sz-1;
375 memcpy(path,inf.filename,len);