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1 | /* | |
2 | * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. | |
3 | * | |
4 | * Licensed under the OpenSSL license (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_locl.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 | ||
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 | ||
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 | DSOerr(DSO_F_DL_LOAD, 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 | DSOerr(DSO_F_DL_LOAD, DSO_R_LOAD_FAILED); | |
73 | if (openssl_strerror_r(errno, errbuf, sizeof(errbuf))) | |
74 | ERR_add_error_data(4, "filename(", filename, "): ", errbuf); | |
75 | goto err; | |
76 | } | |
77 | if (!sk_push(dso->meth_data, (char *)ptr)) { | |
78 | DSOerr(DSO_F_DL_LOAD, DSO_R_STACK_ERROR); | |
79 | goto err; | |
80 | } | |
81 | /* | |
82 | * Success, stick the converted filename we've loaded under into the DSO | |
83 | * (it also serves as the indicator that we are currently loaded). | |
84 | */ | |
85 | dso->loaded_filename = filename; | |
86 | return 1; | |
87 | err: | |
88 | /* Cleanup! */ | |
89 | OPENSSL_free(filename); | |
90 | if (ptr != NULL) | |
91 | shl_unload(ptr); | |
92 | return (0); | |
93 | } | |
94 | ||
95 | static int dl_unload(DSO *dso) | |
96 | { | |
97 | shl_t ptr; | |
98 | if (dso == NULL) { | |
99 | DSOerr(DSO_F_DL_UNLOAD, ERR_R_PASSED_NULL_PARAMETER); | |
100 | return (0); | |
101 | } | |
102 | if (sk_num(dso->meth_data) < 1) | |
103 | return 1; | |
104 | /* Is this statement legal? */ | |
105 | ptr = (shl_t) sk_pop(dso->meth_data); | |
106 | if (ptr == NULL) { | |
107 | DSOerr(DSO_F_DL_UNLOAD, DSO_R_NULL_HANDLE); | |
108 | /* | |
109 | * Should push the value back onto the stack in case of a retry. | |
110 | */ | |
111 | sk_push(dso->meth_data, (char *)ptr); | |
112 | return (0); | |
113 | } | |
114 | shl_unload(ptr); | |
115 | return 1; | |
116 | } | |
117 | ||
118 | static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname) | |
119 | { | |
120 | shl_t ptr; | |
121 | void *sym; | |
122 | ||
123 | if ((dso == NULL) || (symname == NULL)) { | |
124 | DSOerr(DSO_F_DL_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER); | |
125 | return (NULL); | |
126 | } | |
127 | if (sk_num(dso->meth_data) < 1) { | |
128 | DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_STACK_ERROR); | |
129 | return (NULL); | |
130 | } | |
131 | ptr = (shl_t) sk_value(dso->meth_data, sk_num(dso->meth_data) - 1); | |
132 | if (ptr == NULL) { | |
133 | DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_NULL_HANDLE); | |
134 | return (NULL); | |
135 | } | |
136 | if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) { | |
137 | char errbuf[160]; | |
138 | DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_SYM_FAILURE); | |
139 | if (openssl_strerror_r(errno, errbuf, sizeof(errbuf))) | |
140 | ERR_add_error_data(4, "symname(", symname, "): ", errbuf); | |
141 | return (NULL); | |
142 | } | |
143 | return ((DSO_FUNC_TYPE)sym); | |
144 | } | |
145 | ||
146 | static char *dl_merger(DSO *dso, const char *filespec1, const char *filespec2) | |
147 | { | |
148 | char *merged; | |
149 | ||
150 | if (!filespec1 && !filespec2) { | |
151 | DSOerr(DSO_F_DL_MERGER, ERR_R_PASSED_NULL_PARAMETER); | |
152 | return (NULL); | |
153 | } | |
154 | /* | |
155 | * If the first file specification is a rooted path, it rules. same goes | |
156 | * if the second file specification is missing. | |
157 | */ | |
158 | if (!filespec2 || filespec1[0] == '/') { | |
159 | merged = OPENSSL_strdup(filespec1); | |
160 | if (merged == NULL) { | |
161 | DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE); | |
162 | return (NULL); | |
163 | } | |
164 | } | |
165 | /* | |
166 | * If the first file specification is missing, the second one rules. | |
167 | */ | |
168 | else if (!filespec1) { | |
169 | merged = OPENSSL_strdup(filespec2); | |
170 | if (merged == NULL) { | |
171 | DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE); | |
172 | return (NULL); | |
173 | } | |
174 | } else | |
175 | /* | |
176 | * This part isn't as trivial as it looks. It assumes that the | |
177 | * second file specification really is a directory, and makes no | |
178 | * checks whatsoever. Therefore, the result becomes the | |
179 | * concatenation of filespec2 followed by a slash followed by | |
180 | * filespec1. | |
181 | */ | |
182 | { | |
183 | int spec2len, len; | |
184 | ||
185 | spec2len = (filespec2 ? strlen(filespec2) : 0); | |
186 | len = spec2len + (filespec1 ? strlen(filespec1) : 0); | |
187 | ||
188 | if (spec2len && filespec2[spec2len - 1] == '/') { | |
189 | spec2len--; | |
190 | len--; | |
191 | } | |
192 | merged = OPENSSL_malloc(len + 2); | |
193 | if (merged == NULL) { | |
194 | DSOerr(DSO_F_DL_MERGER, ERR_R_MALLOC_FAILURE); | |
195 | return (NULL); | |
196 | } | |
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 | */ | |
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 = (strstr(filename, "/") == NULL); | |
219 | { | |
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 | DSOerr(DSO_F_DL_NAME_CONVERTER, DSO_R_NAME_TRANSLATION_FAILED); | |
228 | return (NULL); | |
229 | } | |
230 | if (transform) { | |
231 | if ((DSO_flags(dso) & DSO_FLAG_NAME_TRANSLATION_EXT_ONLY) == 0) | |
232 | sprintf(translated, "lib%s%s", filename, DSO_EXTENSION); | |
233 | else | |
234 | sprintf(translated, "%s%s", filename, DSO_EXTENSION); | |
235 | } else | |
236 | sprintf(translated, "%s", filename); | |
237 | return (translated); | |
238 | } | |
239 | ||
240 | static int dl_pathbyaddr(void *addr, char *path, int sz) | |
241 | { | |
242 | struct shl_descriptor inf; | |
243 | int i, len; | |
244 | ||
245 | if (addr == NULL) { | |
246 | union { | |
247 | int (*f) (void *, char *, int); | |
248 | void *p; | |
249 | } t = { | |
250 | dl_pathbyaddr | |
251 | }; | |
252 | addr = t.p; | |
253 | } | |
254 | ||
255 | for (i = -1; shl_get_r(i, &inf) == 0; i++) { | |
256 | if (((size_t)addr >= inf.tstart && (size_t)addr < inf.tend) || | |
257 | ((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 | ||
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 */ |