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0f113f3e | 1 | /* |
605856d7 | 2 | * Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. |
8f4fac7f | 3 | * |
b6a34e9a | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
d2e9e320 RS |
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 | |
8f4fac7f GT |
8 | */ |
9 | ||
706457b7 | 10 | #include "dso_local.h" |
8f4fac7f | 11 | |
38186bfd | 12 | #ifdef DSO_DL |
8f4fac7f | 13 | |
0f113f3e | 14 | # include <dl.h> |
8f4fac7f | 15 | |
b9e63915 | 16 | /* Part of the hack in "dl_load" ... */ |
0f113f3e | 17 | # define DSO_MAX_TRANSLATED_SIZE 256 |
b9e63915 | 18 | |
51c8dc37 | 19 | static int dl_load(DSO *dso); |
8f4fac7f | 20 | static int dl_unload(DSO *dso); |
e9a68cfb | 21 | static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname); |
51c8dc37 | 22 | static char *dl_name_converter(DSO *dso, const char *filename); |
0f113f3e MC |
23 | static char *dl_merger(DSO *dso, const char *filespec1, |
24 | const char *filespec2); | |
cb6ea61c | 25 | static int dl_pathbyaddr(void *addr, char *path, int sz); |
c6cb42e4 | 26 | static void *dl_globallookup(const char *name); |
8f4fac7f GT |
27 | |
28 | static DSO_METHOD dso_meth_dl = { | |
0f113f3e MC |
29 | "OpenSSL 'dl' shared library method", |
30 | dl_load, | |
31 | dl_unload, | |
0f113f3e | 32 | dl_bind_func, |
0f113f3e MC |
33 | NULL, /* ctrl */ |
34 | dl_name_converter, | |
35 | dl_merger, | |
36 | NULL, /* init */ | |
37 | NULL, /* finish */ | |
cb6ea61c | 38 | dl_pathbyaddr, |
0f113f3e MC |
39 | dl_globallookup |
40 | }; | |
8f4fac7f | 41 | |
38186bfd | 42 | DSO_METHOD *DSO_METHOD_openssl(void) |
0f113f3e | 43 | { |
38186bfd | 44 | return &dso_meth_dl; |
0f113f3e | 45 | } |
8f4fac7f | 46 | |
0f113f3e MC |
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. | |
8f4fac7f GT |
51 | */ |
52 | ||
51c8dc37 | 53 | static int dl_load(DSO *dso) |
0f113f3e MC |
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); | |
8f4fac7f | 62 | |
0f113f3e | 63 | if (filename == NULL) { |
9311d0c4 | 64 | ERR_raise(ERR_LIB_DSO, DSO_R_NO_FILENAME); |
0f113f3e MC |
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) { | |
7d37818d | 71 | char errbuf[160]; |
a150f8e1 | 72 | |
7d37818d | 73 | if (openssl_strerror_r(errno, errbuf, sizeof(errbuf))) |
a150f8e1 RL |
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); | |
0f113f3e MC |
79 | goto err; |
80 | } | |
81 | if (!sk_push(dso->meth_data, (char *)ptr)) { | |
9311d0c4 | 82 | ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR); |
0f113f3e MC |
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; | |
208fb891 | 90 | return 1; |
0f113f3e MC |
91 | err: |
92 | /* Cleanup! */ | |
b548a1f1 | 93 | OPENSSL_free(filename); |
0f113f3e MC |
94 | if (ptr != NULL) |
95 | shl_unload(ptr); | |
26a7d938 | 96 | return 0; |
0f113f3e | 97 | } |
8f4fac7f GT |
98 | |
99 | static int dl_unload(DSO *dso) | |
0f113f3e MC |
100 | { |
101 | shl_t ptr; | |
102 | if (dso == NULL) { | |
9311d0c4 | 103 | ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER); |
26a7d938 | 104 | return 0; |
0f113f3e MC |
105 | } |
106 | if (sk_num(dso->meth_data) < 1) | |
208fb891 | 107 | return 1; |
0f113f3e MC |
108 | /* Is this statement legal? */ |
109 | ptr = (shl_t) sk_pop(dso->meth_data); | |
110 | if (ptr == NULL) { | |
9311d0c4 | 111 | ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE); |
0f113f3e MC |
112 | /* |
113 | * Should push the value back onto the stack in case of a retry. | |
114 | */ | |
115 | sk_push(dso->meth_data, (char *)ptr); | |
26a7d938 | 116 | return 0; |
0f113f3e MC |
117 | } |
118 | shl_unload(ptr); | |
208fb891 | 119 | return 1; |
0f113f3e | 120 | } |
8f4fac7f | 121 | |
e9a68cfb | 122 | static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname) |
0f113f3e MC |
123 | { |
124 | shl_t ptr; | |
125 | void *sym; | |
e9a68cfb | 126 | |
0f113f3e | 127 | if ((dso == NULL) || (symname == NULL)) { |
9311d0c4 | 128 | ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER); |
26a7d938 | 129 | return NULL; |
0f113f3e MC |
130 | } |
131 | if (sk_num(dso->meth_data) < 1) { | |
9311d0c4 | 132 | ERR_raise(ERR_LIB_DSO, DSO_R_STACK_ERROR); |
26a7d938 | 133 | return NULL; |
0f113f3e MC |
134 | } |
135 | ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); | |
136 | if (ptr == NULL) { | |
9311d0c4 | 137 | ERR_raise(ERR_LIB_DSO, DSO_R_NULL_HANDLE); |
26a7d938 | 138 | return NULL; |
0f113f3e MC |
139 | } |
140 | if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) { | |
7d37818d | 141 | char errbuf[160]; |
a150f8e1 | 142 | |
7d37818d | 143 | if (openssl_strerror_r(errno, errbuf, sizeof(errbuf))) |
a150f8e1 RL |
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); | |
26a7d938 | 149 | return NULL; |
0f113f3e | 150 | } |
26a7d938 | 151 | return (DSO_FUNC_TYPE)sym; |
0f113f3e | 152 | } |
8f4fac7f | 153 | |
cbecb3ac | 154 | static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2) |
0f113f3e MC |
155 | { |
156 | char *merged; | |
cbecb3ac | 157 | |
0f113f3e | 158 | if (!filespec1 && !filespec2) { |
9311d0c4 | 159 | ERR_raise(ERR_LIB_DSO, ERR_R_PASSED_NULL_PARAMETER); |
26a7d938 | 160 | return NULL; |
0f113f3e MC |
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] == '/') { | |
297002a3 | 167 | merged = OPENSSL_strdup(filespec1); |
90945fa3 | 168 | if (merged == NULL) { |
9311d0c4 | 169 | ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE); |
26a7d938 | 170 | return NULL; |
0f113f3e | 171 | } |
0f113f3e MC |
172 | } |
173 | /* | |
174 | * If the first file specification is missing, the second one rules. | |
175 | */ | |
176 | else if (!filespec1) { | |
297002a3 | 177 | merged = OPENSSL_strdup(filespec2); |
90945fa3 | 178 | if (merged == NULL) { |
9311d0c4 | 179 | ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE); |
26a7d938 | 180 | return NULL; |
0f113f3e | 181 | } |
0f113f3e MC |
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; | |
cbecb3ac | 192 | |
0f113f3e MC |
193 | spec2len = (filespec2 ? strlen(filespec2) : 0); |
194 | len = spec2len + (filespec1 ? strlen(filespec1) : 0); | |
cbecb3ac | 195 | |
947f9da1 | 196 | if (spec2len && filespec2[spec2len - 1] == '/') { |
0f113f3e MC |
197 | spec2len--; |
198 | len--; | |
199 | } | |
200 | merged = OPENSSL_malloc(len + 2); | |
90945fa3 | 201 | if (merged == NULL) { |
9311d0c4 | 202 | ERR_raise(ERR_LIB_DSO, ERR_R_MALLOC_FAILURE); |
26a7d938 | 203 | return NULL; |
0f113f3e MC |
204 | } |
205 | strcpy(merged, filespec2); | |
206 | merged[spec2len] = '/'; | |
207 | strcpy(&merged[spec2len + 1], filespec1); | |
208 | } | |
26a7d938 | 209 | return merged; |
0f113f3e | 210 | } |
cbecb3ac | 211 | |
0f113f3e MC |
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 | */ | |
51c8dc37 | 219 | static char *dl_name_converter(DSO *dso, const char *filename) |
0f113f3e MC |
220 | { |
221 | char *translated; | |
222 | int len, rsize, transform; | |
51c8dc37 | 223 | |
0f113f3e MC |
224 | len = strlen(filename); |
225 | rsize = len + 1; | |
226 | transform = (strstr(filename, "/") == NULL); | |
d475a9ef | 227 | if (transform) { |
0f113f3e | 228 | /* We will convert this to "%s.s?" or "lib%s.s?" */ |
e987f9f2 | 229 | rsize += strlen(DSO_EXTENSION); /* The length of ".s?" */ |
0f113f3e MC |
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) { | |
9311d0c4 | 235 | ERR_raise(ERR_LIB_DSO, DSO_R_NAME_TRANSLATION_FAILED); |
26a7d938 | 236 | return NULL; |
0f113f3e MC |
237 | } |
238 | if (transform) { | |
239 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) | |
e987f9f2 | 240 | sprintf(translated, "lib%s%s", filename, DSO_EXTENSION); |
0f113f3e | 241 | else |
e987f9f2 | 242 | sprintf(translated, "%s%s", filename, DSO_EXTENSION); |
0f113f3e MC |
243 | } else |
244 | sprintf(translated, "%s", filename); | |
26a7d938 | 245 | return translated; |
0f113f3e | 246 | } |
51c8dc37 | 247 | |
cb6ea61c MC |
248 | static 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 | ||
c6cb42e4 | 280 | static void *dl_globallookup(const char *name) |
0f113f3e MC |
281 | { |
282 | void *ret; | |
283 | shl_t h = NULL; | |
68b64fb6 | 284 | |
0f113f3e MC |
285 | return shl_findsym(&h, name, TYPE_UNDEFINED, &ret) ? NULL : ret; |
286 | } | |
287 | #endif /* DSO_DL */ |