1 /*
2 * Copyright 2000-2024 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
19 static int dl_load(DSO *dso);
20 static int dl_unload(DSO *dso);
21 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname);
22 static char *dl_name_converter(DSO *dso, const char *filename);
23 static char *dl_merger(DSO *dso, const char *filespec1,
24 const char *filespec2);
25 static int dl_pathbyaddr(void *addr, char *path, int sz);
26 static void *dl_globallookup(const char *name);
27
28 static 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
DSO_METHOD_openssl(void)42 DSO_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
dl_load(DSO * dso)53 static 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
dl_unload(DSO * dso)99 static 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
dl_bind_func(DSO * dso,const char * symname)122 static 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
dl_merger(DSO * dso,const char * filespec1,const char * filespec2)154 static 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 return NULL;
170 }
171 /*
172 * If the first file specification is missing, the second one rules.
173 */
174 else if (!filespec1) {
175 merged = OPENSSL_strdup(filespec2);
176 if (merged == NULL)
177 return NULL;
178 } else
179 /*
180 * This part isn't as trivial as it looks. It assumes that the
181 * second file specification really is a directory, and makes no
182 * checks whatsoever. Therefore, the result becomes the
183 * concatenation of filespec2 followed by a slash followed by
184 * filespec1.
185 */
186 {
187 int spec2len, len;
188
189 spec2len = (filespec2 ? strlen(filespec2) : 0);
190 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
191
192 if (spec2len && filespec2[spec2len - 1] == '/') {
193 spec2len--;
194 len--;
195 }
196 merged = OPENSSL_malloc(len + 2);
197 if (merged == NULL)
198 return NULL;
199 strcpy(merged, filespec2);
200 merged[spec2len] = '/';
201 strcpy(&merged[spec2len + 1], filespec1);
202 }
203 return merged;
204 }
205
206 /*
207 * This function is identical to the one in dso_dlfcn.c, but as it is highly
208 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
209 * the same time, there's no great duplicating the code. Figuring out an
210 * elegant way to share one copy of the code would be more difficult and
211 * would not leave the implementations independent.
212 */
dl_name_converter(DSO * dso,const char * filename)213 static char *dl_name_converter(DSO *dso, const char *filename)
214 {
215 char *translated;
216 int len, rsize, transform;
217
218 len = strlen(filename);
219 rsize = len + 1;
220 transform = (strchr(filename, '/') == NULL);
221 if (transform) {
222 /* We will convert this to "%s.s?" or "lib%s.s?" */
223 rsize += strlen(DSO_EXTENSION); /* The length of ".s?" */
224 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
225 rsize += 3; /* The length of "lib" */
226 }
227 translated = OPENSSL_malloc(rsize);
228 if (translated == NULL) {
229 ERR_raise(ERR_LIB_DSO, DSO_R_NAME_TRANSLATION_FAILED);
230 return NULL;
231 }
232 if (transform)
233 BIO_snprintf(translated, rsize,
234 (DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0
235 ? "lib%s%s" : "%s%s", filename, DSO_EXTENSION);
236 else
237 BIO_snprintf(translated, rsize, "%s", filename);
238 return translated;
239 }
240
dl_pathbyaddr(void * addr,char * path,int sz)241 static int dl_pathbyaddr(void *addr, char *path, int sz)
242 {
243 struct shl_descriptor inf;
244 int i, len;
245
246 if (addr == NULL) {
247 union {
248 int (*f) (void *, char *, int);
249 void *p;
250 } t = {
251 dl_pathbyaddr
252 };
253 addr = t.p;
254 }
255
256 for (i = -1; shl_get_r(i, &inf) == 0; i++) {
257 if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) ||
258 ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) {
259 len = (int)strlen(inf.filename);
260 if (sz <= 0)
261 return len + 1;
262 if (len >= sz)
263 len = sz - 1;
264 memcpy(path, inf.filename, len);
265 path[len++] = 0;
266 return len;
267 }
268 }
269
270 return -1;
271 }
272
dl_globallookup(const char * name)273 static void *dl_globallookup(const char *name)
274 {
275 void *ret;
276 shl_t h = NULL;
277
278 return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret;
279 }
280 #endif /* DSO_DL */
281
