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 | (dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 : DYNAMIC_PATH), 0L);
68 if (ptr == NULL) {
69 char errbuf[160];
70
71 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
72 ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
73 "filename(%s): %s", filename, errbuf);
74 else
75 ERR_raise_data(ERR_LIB_DSO, DSO_R_LOAD_FAILED,
76 "filename(%s): errno %d", filename, errno);
77 goto err;
78 }
79 if (!sk_push(dso->meth_data, (char *)ptr)) {
80 ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
81 goto err;
82 }
83 /*
84 * Success, stick the converted filename we've loaded under into the DSO
85 * (it also serves as the indicator that we are currently loaded).
86 */
87 dso->loaded_filename = filename;
88 return 1;
89 err:
90 /* Cleanup! */
91 OPENSSL_free(filename);
92 if (ptr != NULL)
93 shl_unload(ptr);
94 return 0;
95 }
96
dl_unload(DSO * dso)97 static int dl_unload(DSO *dso)
98 {
99 shl_t ptr;
100 if (dso == NULL) {
101 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
102 return 0;
103 }
104 if (sk_num(dso->meth_data) < 1)
105 return 1;
106 /* Is this statement legal? */
107 ptr = (shl_t)sk_pop(dso->meth_data);
108 if (ptr == NULL) {
109 ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE);
110 /*
111 * Should push the value back onto the stack in case of a retry.
112 */
113 sk_push(dso->meth_data, (char *)ptr);
114 return 0;
115 }
116 shl_unload(ptr);
117 return 1;
118 }
119
dl_bind_func(DSO * dso,const char * symname)120 static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
121 {
122 shl_t ptr;
123 void *sym;
124
125 if ((dso == NULL) || (symname == NULL)) {
126 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
127 return NULL;
128 }
129 if (sk_num(dso->meth_data) < 1) {
130 ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR);
131 return NULL;
132 }
133 ptr = (shl_t)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
134 if (ptr == NULL) {
135 ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE);
136 return NULL;
137 }
138 if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
139 char errbuf[160];
140
141 if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
142 ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
143 "symname(%s): %s", symname, errbuf);
144 else
145 ERR_raise_data(ERR_LIB_DSO, DSO_R_SYM_FAILURE,
146 "symname(%s): errno %d", symname, errno);
147 return NULL;
148 }
149 return (DSO_FUNC_TYPE)sym;
150 }
151
dl_merger(DSO * dso,const char * filespec1,const char * filespec2)152 static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2)
153 {
154 char *merged;
155
156 if (!filespec1 && !filespec2) {
157 ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER);
158 return NULL;
159 }
160 /*
161 * If the first file specification is a rooted path, it rules. same goes
162 * if the second file specification is missing.
163 */
164 if (!filespec2 || filespec1[0] == '/') {
165 merged = OPENSSL_strdup(filespec1);
166 if (merged == NULL)
167 return NULL;
168 }
169 /*
170 * If the first file specification is missing, the second one rules.
171 */
172 else if (!filespec1) {
173 merged = OPENSSL_strdup(filespec2);
174 if (merged == NULL)
175 return NULL;
176 } else
177 /*
178 * This part isn't as trivial as it looks. It assumes that the
179 * second file specification really is a directory, and makes no
180 * checks whatsoever. Therefore, the result becomes the
181 * concatenation of filespec2 followed by a slash followed by
182 * filespec1.
183 */
184 {
185 int spec2len, len;
186
187 spec2len = (filespec2 ? strlen(filespec2) : 0);
188 len = spec2len + (filespec1 ? strlen(filespec1) : 0);
189
190 if (spec2len && filespec2[spec2len - 1] == '/') {
191 spec2len--;
192 len--;
193 }
194 merged = OPENSSL_malloc(len + 2);
195 if (merged == NULL)
196 return NULL;
197 strcpy(merged, filespec2);
198 merged[spec2len] = '/';
199 strcpy(&merged[spec2len + 1], filespec1);
200 }
201 return merged;
202 }
203
204 /*
205 * This function is identical to the one in dso_dlfcn.c, but as it is highly
206 * unlikely that both the "dl" *and* "dlfcn" variants are being compiled at
207 * the same time, there's no great duplicating the code. Figuring out an
208 * elegant way to share one copy of the code would be more difficult and
209 * would not leave the implementations independent.
210 */
dl_name_converter(DSO * dso,const char * filename)211 static char *dl_name_converter(DSO *dso, const char *filename)
212 {
213 char *translated;
214 int len, rsize, transform;
215
216 len = strlen(filename);
217 rsize = len + 1;
218 transform = (strchr(filename, '/') == NULL);
219 if (transform) {
220 /* We will convert this to "%s.s?" or "lib%s.s?" */
221 rsize += strlen(DSO_EXTENSION); /* The length of ".s?" */
222 if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0)
223 rsize += 3; /* The length of "lib" */
224 }
225 translated = OPENSSL_malloc(rsize);
226 if (translated == NULL) {
227 ERR_raise(ERR_LIB_DSO, DSO_R_NAME_TRANSLATION_FAILED);
228 return NULL;
229 }
230 if (transform)
231 BIO_snprintf(translated, rsize,
232 (DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0
233 ? "lib%s%s"
234 : "%s%s",
235 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) || ((size_t)addr >= inf.dstart && (size_t)addr < inf.dend)) {
258 len = (int)strlen(inf.filename);
259 if (sz <= 0)
260 return len + 1;
261 if (len >= sz)
262 len = sz - 1;
263 memcpy(path, inf.filename, len);
264 path[len++] = 0;
265 return len;
266 }
267 }
268
269 return -1;
270 }
271
dl_globallookup(const char * name)272 static void *dl_globallookup(const char *name)
273 {
274 void *ret;
275 shl_t h = NULL;
276
277 return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret;
278 }
279 #endif /* DSO_DL */
280