/src/httpd/srclib/apr/misc/unix/rand.c
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1 | | /* Licensed to the Apache Software Foundation (ASF) under one or more |
2 | | * contributor license agreements. See the NOTICE file distributed with |
3 | | * this work for additional information regarding copyright ownership. |
4 | | * The ASF licenses this file to You under the Apache License, Version 2.0 |
5 | | * (the "License"); you may not use this file except in compliance with |
6 | | * the License. You may obtain a copy of the License at |
7 | | * |
8 | | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | | * |
10 | | * Unless required by applicable law or agreed to in writing, software |
11 | | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | | * See the License for the specific language governing permissions and |
14 | | * limitations under the License. |
15 | | */ |
16 | | |
17 | | #define APR_WANT_MEMFUNC |
18 | | #include "apr_want.h" |
19 | | #include "apr_general.h" |
20 | | |
21 | | #include "apr_arch_misc.h" |
22 | | #include <sys/stat.h> |
23 | | #if APR_HAVE_SYS_TYPES_H |
24 | | #include <sys/types.h> |
25 | | #endif |
26 | | #if APR_HAVE_SYS_SOCKET_H |
27 | | #include <sys/socket.h> |
28 | | #endif |
29 | | #if APR_HAVE_FCNTL_H |
30 | | #include <fcntl.h> |
31 | | #endif |
32 | | #if APR_HAVE_UNISTD_H |
33 | | #include <unistd.h> |
34 | | #endif |
35 | | #if APR_HAVE_SYS_UN_H |
36 | | #include <sys/un.h> |
37 | | #endif |
38 | | #if defined(HAVE_UUID_H) |
39 | | #include <uuid.h> |
40 | | #elif defined(HAVE_UUID_UUID_H) |
41 | | #include <uuid/uuid.h> |
42 | | #elif defined(HAVE_SYS_UUID_H) |
43 | | #include <sys/uuid.h> |
44 | | #endif |
45 | | |
46 | | #if defined(SYS_RANDOM) |
47 | | #if defined(HAVE_SYS_RANDOM_H) && \ |
48 | | defined(HAVE_GETRANDOM) |
49 | | |
50 | | #include <sys/random.h> |
51 | | #define USE_GETRANDOM |
52 | | |
53 | | #elif defined(HAVE_SYS_SYSCALL_H) && \ |
54 | | defined(HAVE_LINUX_RANDOM_H) && \ |
55 | | defined(HAVE_DECL_SYS_GETRANDOM) && \ |
56 | | HAVE_DECL_SYS_GETRANDOM |
57 | | |
58 | | #ifndef _GNU_SOURCE |
59 | | #define _GNU_SOURCE |
60 | | #endif |
61 | | #include <unistd.h> |
62 | | #include <sys/syscall.h> |
63 | | #include <linux/random.h> |
64 | | #define getrandom(buf, buflen, flags) \ |
65 | | syscall(SYS_getrandom, (buf), (buflen), (flags)) |
66 | | #define USE_GETRANDOM |
67 | | |
68 | | #endif /* HAVE_SYS_RANDOM_H */ |
69 | | #endif /* SYS_RANDOM */ |
70 | | |
71 | | #ifndef SHUT_RDWR |
72 | | #define SHUT_RDWR 2 |
73 | | #endif |
74 | | |
75 | | #if APR_HAS_OS_UUID |
76 | | |
77 | | #if defined(HAVE_UUID_CREATE) |
78 | | |
79 | | APR_DECLARE(apr_status_t) apr_os_uuid_get(unsigned char *uuid_data) |
80 | | { |
81 | | uint32_t rv; |
82 | | uuid_t g; |
83 | | |
84 | | uuid_create(&g, &rv); |
85 | | |
86 | | if (rv != uuid_s_ok) |
87 | | return APR_EGENERAL; |
88 | | |
89 | | memcpy(uuid_data, &g, sizeof(uuid_t)); |
90 | | |
91 | | return APR_SUCCESS; |
92 | | } |
93 | | |
94 | | #elif defined(HAVE_UUID_GENERATE) |
95 | | |
96 | | APR_DECLARE(apr_status_t) apr_os_uuid_get(unsigned char *uuid_data) |
97 | 0 | { |
98 | 0 | uuid_t g; |
99 | |
|
100 | 0 | uuid_generate(g); |
101 | |
|
102 | 0 | memcpy(uuid_data, g, sizeof(uuid_t)); |
103 | |
|
104 | 0 | return APR_SUCCESS; |
105 | 0 | } |
106 | | #endif |
107 | | |
108 | | #endif /* APR_HAS_OS_UUID */ |
109 | | |
110 | | #if APR_HAS_RANDOM |
111 | | |
112 | | APR_DECLARE(apr_status_t) apr_generate_random_bytes(unsigned char *buf, |
113 | | apr_size_t length) |
114 | 0 | { |
115 | | #if defined(HAVE_EGD) |
116 | | /* use EGD-compatible socket daemon (such as EGD or PRNGd). |
117 | | * message format: |
118 | | * 0x00 (get entropy level) |
119 | | * 0xMM (msb) 0xmm 0xll 0xLL (lsb) |
120 | | * 0x01 (read entropy nonblocking) 0xNN (bytes requested) |
121 | | * 0xMM (bytes granted) MM bytes |
122 | | * 0x02 (read entropy blocking) 0xNN (bytes desired) |
123 | | * [block] NN bytes |
124 | | * 0x03 (write entropy) 0xMM 0xLL (bits of entropy) 0xNN (bytes of data) |
125 | | * NN bytes |
126 | | * (no response - write only) |
127 | | * 0x04 (report PID) |
128 | | * 0xMM (length of PID string, not null-terminated) MM chars |
129 | | */ |
130 | | static const char *egd_sockets[] = { EGD_DEFAULT_SOCKET, NULL }; |
131 | | const char **egdsockname = NULL; |
132 | | |
133 | | int egd_socket, egd_path_len, rv, bad_errno; |
134 | | struct sockaddr_un addr; |
135 | | apr_socklen_t egd_addr_len; |
136 | | apr_size_t resp_expected; |
137 | | unsigned char req[2], resp[255]; |
138 | | unsigned char *curbuf = buf; |
139 | | |
140 | | for (egdsockname = egd_sockets; *egdsockname && length > 0; egdsockname++) { |
141 | | egd_path_len = strlen(*egdsockname); |
142 | | |
143 | | if (egd_path_len > sizeof(addr.sun_path)) { |
144 | | return APR_EINVAL; |
145 | | } |
146 | | |
147 | | memset(&addr, 0, sizeof(struct sockaddr_un)); |
148 | | addr.sun_family = AF_UNIX; |
149 | | memcpy(addr.sun_path, *egdsockname, egd_path_len); |
150 | | egd_addr_len = APR_OFFSETOF(struct sockaddr_un, sun_path) + |
151 | | egd_path_len; |
152 | | |
153 | | egd_socket = socket(PF_UNIX, SOCK_STREAM, 0); |
154 | | |
155 | | if (egd_socket == -1) { |
156 | | return errno; |
157 | | } |
158 | | |
159 | | rv = connect(egd_socket, (struct sockaddr*)&addr, egd_addr_len); |
160 | | |
161 | | if (rv == -1) { |
162 | | bad_errno = errno; |
163 | | continue; |
164 | | } |
165 | | |
166 | | /* EGD can only return 255 bytes of data at a time. Silly. */ |
167 | | while (length > 0) { |
168 | | apr_ssize_t srv; |
169 | | req[0] = 2; /* We'll block for now. */ |
170 | | req[1] = length > 255 ? 255: length; |
171 | | |
172 | | srv = write(egd_socket, req, 2); |
173 | | if (srv == -1) { |
174 | | bad_errno = errno; |
175 | | shutdown(egd_socket, SHUT_RDWR); |
176 | | close(egd_socket); |
177 | | break; |
178 | | } |
179 | | |
180 | | if (srv != 2) { |
181 | | shutdown(egd_socket, SHUT_RDWR); |
182 | | close(egd_socket); |
183 | | return APR_EGENERAL; |
184 | | } |
185 | | |
186 | | resp_expected = req[1]; |
187 | | srv = read(egd_socket, resp, resp_expected); |
188 | | if (srv == -1) { |
189 | | bad_errno = errno; |
190 | | shutdown(egd_socket, SHUT_RDWR); |
191 | | close(egd_socket); |
192 | | return bad_errno; |
193 | | } |
194 | | |
195 | | memcpy(curbuf, resp, srv); |
196 | | curbuf += srv; |
197 | | length -= srv; |
198 | | } |
199 | | |
200 | | shutdown(egd_socket, SHUT_RDWR); |
201 | | close(egd_socket); |
202 | | } |
203 | | |
204 | | if (length > 0) { |
205 | | /* We must have iterated through the list of sockets, |
206 | | * and no go. Return the errno. |
207 | | */ |
208 | | return bad_errno; |
209 | | } |
210 | | |
211 | | #elif defined(SYS_RANDOM) && defined(USE_GETRANDOM) |
212 | |
|
213 | 0 | do { |
214 | 0 | int rc; |
215 | |
|
216 | 0 | rc = getrandom(buf, length, 0); |
217 | 0 | if (rc == -1) { |
218 | 0 | if (errno == EINTR) { |
219 | 0 | continue; |
220 | 0 | } |
221 | 0 | return errno; |
222 | 0 | } |
223 | | |
224 | 0 | buf += rc; |
225 | 0 | length -= rc; |
226 | 0 | } while (length > 0); |
227 | | |
228 | | #elif defined(SYS_RANDOM) && defined(HAVE_ARC4RANDOM_BUF) |
229 | | |
230 | | arc4random_buf(buf, length); |
231 | | |
232 | | #elif defined(DEV_RANDOM) |
233 | | |
234 | | int fd = -1; |
235 | | |
236 | | /* On BSD/OS 4.1, /dev/random gives out 8 bytes at a time, then |
237 | | * gives EOF, so reading 'length' bytes may require opening the |
238 | | * device several times. */ |
239 | | do { |
240 | | apr_ssize_t rc; |
241 | | |
242 | | if (fd == -1) |
243 | | if ((fd = open(DEV_RANDOM, O_RDONLY)) == -1) |
244 | | return errno; |
245 | | |
246 | | do { |
247 | | rc = read(fd, buf, length); |
248 | | } while (rc == -1 && errno == EINTR); |
249 | | |
250 | | if (rc < 0) { |
251 | | int errnum = errno; |
252 | | close(fd); |
253 | | return errnum; |
254 | | } |
255 | | else if (rc == 0) { |
256 | | close(fd); |
257 | | fd = -1; /* force open() again */ |
258 | | } |
259 | | else { |
260 | | buf += rc; |
261 | | length -= rc; |
262 | | } |
263 | | } while (length > 0); |
264 | | |
265 | | close(fd); |
266 | | |
267 | | #elif defined(OS2) |
268 | | |
269 | | static UCHAR randbyte(); |
270 | | unsigned int idx; |
271 | | |
272 | | for (idx=0; idx<length; idx++) |
273 | | buf[idx] = randbyte(); |
274 | | |
275 | | #elif defined(HAVE_TRUERAND) /* use truerand */ |
276 | | |
277 | | extern int randbyte(void); /* from the truerand library */ |
278 | | unsigned int idx; |
279 | | |
280 | | /* this will increase the startup time of the server, unfortunately... |
281 | | * (generating 20 bytes takes about 8 seconds) |
282 | | */ |
283 | | for (idx=0; idx<length; idx++) |
284 | | buf[idx] = (unsigned char) randbyte(); |
285 | | |
286 | | #else |
287 | | |
288 | | #error APR_HAS_RANDOM defined with no implementation |
289 | | |
290 | | #endif /* DEV_RANDOM */ |
291 | | |
292 | 0 | return APR_SUCCESS; |
293 | 0 | } |
294 | | |
295 | | #undef STR |
296 | | #undef XSTR |
297 | | |
298 | | #ifdef OS2 |
299 | | #include "randbyte_os2.inc" |
300 | | #endif |
301 | | |
302 | | #endif /* APR_HAS_RANDOM */ |