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source: vbox/trunk/src/libs/openssl-3.0.3/crypto/dso/dso_dl.c@ 96662

Last change on this file since 96662 was 94082, checked in by vboxsync, 3 years ago

libs/openssl-3.0.1: started applying and adjusting our OpenSSL changes to 3.0.1. bugref:10128
File size: 8.4 KB
Line 
1/*
2 * Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "dso_local.h"
11
12#ifdef DSO_DL
13
14# include <dl.h>
15
16/* Part of the hack in "dl_load" ... */
17# define DSO_MAX_TRANSLATED_SIZE 256
18
19static int dl_load(DSO *dso);
20static int dl_unload(DSO *dso);
21static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
22static char *dl_name_converter(DSO *dso, const char *filename);
23static char *dl_merger(DSO *dso, const char *filespec1,
24 const char *filespec2);
25static int dl_pathbyaddr(void *addr, char *path, int sz);
26static void *dl_globallookup(const char *name);
27
28static DSO_METHOD dso_meth_dl = {
29 "OpenSSL 'dl' shared library method",
30 dl_load,
31 dl_unload,
32 dl_bind_func,
33 NULL, /* ctrl */
34 dl_name_converter,
35 dl_merger,
36 NULL, /* init */
37 NULL, /* finish */
38 dl_pathbyaddr,
39 dl_globallookup
40};
41
42DSO_METHOD *DSO_METHOD_openssl(void)
43{
44 return &dso_meth_dl;
45}
46
47/*
48 * For this DSO_METHOD, our meth_data STACK will contain; (i) the handle
49 * (shl_t) returned from shl_load(). NB: I checked on HPUX11 and shl_t is
50 * itself a pointer type so the cast is safe.
51 */
52
53static int dl_load(DSO *dso)
54{
55 shl_t ptr = NULL;
56 /*
57 * We don't do any fancy retries or anything, just take the method's (or
58 * DSO's if it has the callback set) best translation of the
59 * platform-independent filename and try once with that.
60 */
61 char *filename = DSO_convert_filename(dso, NULL);
62
63 if (filename == NULL) {
64 ERR_raise(ERR_LIB_DSO, DSO_R_NO_FILENAME);
65 goto err;
66 }
67 ptr = shl_load(filename, BIND_IMMEDIATE |
68 (dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 :
69 DYNAMIC_PATH), 0L);
70 if (ptr == NULL) {
71 char errbuf[160];
72
73 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
74 ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
75 "filename(%s): %s", filename, errbuf);
76 else
77 ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
78 "filename(%s): errno %d", filename, errno);
79 goto err;
80 }
81 if (!sk_push(dso->meth_data, (char *)ptr)) {
82 ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
83 goto err;
84 }
85 /*
86 * Success, stick the converted filename we've loaded under into the DSO
87 * (it also serves as the indicator that we are currently loaded).
88 */
89 dso->loaded_filename = filename;
90 return 1;
91 err:
92 /* Cleanup! */
93 OPENSSL_free(filename);
94 if (ptr != NULL)
95 shl_unload(ptr);
96 return 0;
97}
98
99static int dl_unload(DSO *dso)
100{
101 shl_t ptr;
102 if (dso == NULL) {
103 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
104 return 0;
105 }
106 if (sk_num(dso->meth_data) < 1)
107 return 1;
108 /* Is this statement legal? */
109 ptr = (shl_t) sk_pop(dso->meth_data);
110 if (ptr == NULL) {
111 ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE);
112 /*
113 * Should push the value back onto the stack in case of a retry.
114 */
115 sk_push(dso->meth_data, (char *)ptr);
116 return 0;
117 }
118 shl_unload(ptr);
119 return 1;
120}
121
122static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
123{
124 shl_t ptr;
125 void *sym;
126
127 if ((dso == NULL) || (symname == NULL)) {
128 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
129 return NULL;
130 }
131 if (sk_num(dso->meth_data) < 1) {
132 ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
133 return NULL;
134 }
135 ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
136 if (ptr == NULL) {
137 ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE);
138 return NULL;
139 }
140 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
141 char errbuf[160];
142
143 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
144 ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
145 "symname(%s): %s", symname, errbuf);
146 else
147 ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
148 "symname(%s): errno %d", symname, errno);
149 return NULL;
150 }
151 return (DSO_FUNC_TYPE)sym;
152}
153
154static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
155{
156 char *merged;
157
158 if (!filespec1 && !filespec2) {
159 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
160 return NULL;
161 }
162 /*
163 * If the first file specification is a rooted path, it rules. same goes
164 * if the second file specification is missing.
165 */
166 if (!filespec2 || filespec1[0] == '/') {
167 merged = OPENSSL_strdup(filespec1);
168 if (merged == NULL) {
169 ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE);
170 return NULL;
171 }
172 }
173 /*
174 * If the first file specification is missing, the second one rules.
175 */
176 else if (!filespec1) {
177 merged = OPENSSL_strdup(filespec2);
178 if (merged == NULL) {
179 ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE);
180 return NULL;
181 }
182 } else
183 /*
184 * This part isn't as trivial as it looks. It assumes that the
185 * second file specification really is a directory, and makes no
186 * checks whatsoever. Therefore, the result becomes the
187 * concatenation of filespec2 followed by a slash followed by
188 * filespec1.
189 */
190 {
191 int spec2len, len;
192
193 spec2len = (filespec2 ? strlen(filespec2) : 0);
194 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
195
196 if (spec2len && filespec2[spec2len - 1] == '/') {
197 spec2len--;
198 len--;
199 }
200 merged = OPENSSL_malloc(len + 2);
201 if (merged == NULL) {
202 ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE);
203 return NULL;
204 }
205 strcpy(merged, filespec2);
206 merged[spec2len] = '/';
207 strcpy(&merged[spec2len + 1], filespec1);
208 }
209 return merged;
210}
211
212/*
213 * This function is identical to the one in dso_dlfcn.c, but as it is highly
214 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
215 * the same time, there's no great duplicating the code. Figuring out an
216 * elegant way to share one copy of the code would be more difficult and
217 * would not leave the implementations independent.
218 */
219static char *dl_name_converter(DSO *dso, const char *filename)
220{
221 char *translated;
222 int len, rsize, transform;
223
224 len = strlen(filename);
225 rsize = len + 1;
226 transform = (strstr(filename, "/") == NULL);
227 if (transform) {
228 /* We will convert this to "%s.s?" or "lib%s.s?" */
229 rsize += strlen(DSO_EXTENSION); /* The length of ".s?" */
230 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
231 rsize += 3; /* The length of "lib" */
232 }
233 translated = OPENSSL_malloc(rsize);
234 if (translated == NULL) {
235 ERR_raise(ERR_LIB_DSO, DSO_R_NAME_TRANSLATION_FAILED);
236 return NULL;
237 }
238 if (transform) {
239 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
240 sprintf(translated, "lib%s%s", filename, DSO_EXTENSION);
241 else
242 sprintf(translated, "%s%s", filename, DSO_EXTENSION);
243 } else
244 sprintf(translated, "%s", filename);
245 return translated;
246}
247
248static int dl_pathbyaddr(void *addr, char *path, int sz)
249{
250 struct shl_descriptor inf;
251 int i, len;
252
253 if (addr == NULL) {
254 union {
255 int (*f) (void *, char *, int);
256 void *p;
257 } t = {
258 dl_pathbyaddr
259 };
260 addr = t.p;
261 }
262
263 for (i = -1; shl_get_r(i, &inf) == 0; i++) {
264 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
265 ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) {
266 len = (int)strlen(inf.filename);
267 if (sz <= 0)
268 return len + 1;
269 if (len >= sz)
270 len = sz - 1;
271 memcpy(path, inf.filename, len);
272 path[len++] = 0;
273 return len;
274 }
275 }
276
277 return -1;
278}
279
280static void *dl_globallookup(const char *name)
281{
282 void *ret;
283 shl_t h = NULL;
284
285 return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret;
286}
287#endif /* DSO_DL */
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