1 | /* |
2 | * Copyright 2000-2016 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 | |
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 */ |
280 | |