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ea88812f FB |
1 | /* |
2 | * QEMU low level functions | |
5fafdf24 | 3 | * |
ea88812f | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
ea88812f FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include <stdlib.h> | |
25 | #include <stdio.h> | |
26 | #include <stdarg.h> | |
0f66998f | 27 | #include <stdbool.h> |
ea88812f | 28 | #include <string.h> |
ea88812f FB |
29 | #include <errno.h> |
30 | #include <unistd.h> | |
aa26bb2d | 31 | #include <fcntl.h> |
f582af58 PB |
32 | |
33 | /* Needed early for CONFIG_BSD etc. */ | |
34 | #include "config-host.h" | |
35 | ||
e78815a5 AF |
36 | #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) |
37 | #include <sys/mman.h> | |
38 | #endif | |
39 | ||
dfe5fff3 | 40 | #ifdef CONFIG_SOLARIS |
605686cd TS |
41 | #include <sys/types.h> |
42 | #include <sys/statvfs.h> | |
e78815a5 AF |
43 | /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for |
44 | discussion about Solaris header problems */ | |
45 | extern int madvise(caddr_t, size_t, int); | |
605686cd | 46 | #endif |
ea88812f | 47 | |
511d2b14 | 48 | #include "qemu-common.h" |
cd245a19 | 49 | #include "trace.h" |
03ff3ca3 | 50 | #include "qemu_socket.h" |
adb696f3 | 51 | #include "monitor.h" |
03ff3ca3 | 52 | |
0f66998f PM |
53 | static bool fips_enabled = false; |
54 | ||
93bfef4c CV |
55 | static const char *qemu_version = QEMU_VERSION; |
56 | ||
1f001dc7 PB |
57 | static int default_fdset_get_fd(int64_t fdset_id, int flags) |
58 | { | |
59 | return -1; | |
60 | } | |
61 | QEMU_WEAK_ALIAS(monitor_fdset_get_fd, default_fdset_get_fd); | |
62 | #define monitor_fdset_get_fd \ | |
63 | QEMU_WEAK_REF(monitor_fdset_get_fd, default_fdset_get_fd) | |
64 | ||
65 | static int default_fdset_dup_fd_add(int64_t fdset_id, int dup_fd) | |
66 | { | |
67 | return -1; | |
68 | } | |
69 | QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_add, default_fdset_dup_fd_add); | |
70 | #define monitor_fdset_dup_fd_add \ | |
71 | QEMU_WEAK_REF(monitor_fdset_dup_fd_add, default_fdset_dup_fd_add) | |
72 | ||
73 | static int default_fdset_dup_fd_remove(int dup_fd) | |
74 | { | |
75 | return -1; | |
76 | } | |
77 | QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_remove, default_fdset_dup_fd_remove); | |
78 | #define monitor_fdset_dup_fd_remove \ | |
79 | QEMU_WEAK_REF(monitor_fdset_dup_fd_remove, default_fdset_dup_fd_remove) | |
80 | ||
81 | static int default_fdset_dup_fd_find(int dup_fd) | |
82 | { | |
83 | return -1; | |
84 | } | |
85 | QEMU_WEAK_ALIAS(monitor_fdset_dup_fd_find, default_fdset_dup_fd_find); | |
86 | #define monitor_fdset_dup_fd_find \ | |
87 | QEMU_WEAK_REF(monitor_fdset_dup_fd_remove, default_fdset_dup_fd_find) | |
88 | ||
128aa589 PB |
89 | int socket_set_cork(int fd, int v) |
90 | { | |
91 | #if defined(SOL_TCP) && defined(TCP_CORK) | |
92 | return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v)); | |
93 | #else | |
94 | return 0; | |
95 | #endif | |
96 | } | |
97 | ||
e78815a5 AF |
98 | int qemu_madvise(void *addr, size_t len, int advice) |
99 | { | |
100 | if (advice == QEMU_MADV_INVALID) { | |
101 | errno = EINVAL; | |
102 | return -1; | |
103 | } | |
104 | #if defined(CONFIG_MADVISE) | |
105 | return madvise(addr, len, advice); | |
106 | #elif defined(CONFIG_POSIX_MADVISE) | |
107 | return posix_madvise(addr, len, advice); | |
108 | #else | |
109 | errno = EINVAL; | |
110 | return -1; | |
111 | #endif | |
112 | } | |
113 | ||
adb696f3 CB |
114 | #ifndef _WIN32 |
115 | /* | |
116 | * Dups an fd and sets the flags | |
117 | */ | |
118 | static int qemu_dup_flags(int fd, int flags) | |
119 | { | |
120 | int ret; | |
121 | int serrno; | |
122 | int dup_flags; | |
adb696f3 CB |
123 | |
124 | #ifdef F_DUPFD_CLOEXEC | |
125 | ret = fcntl(fd, F_DUPFD_CLOEXEC, 0); | |
126 | #else | |
127 | ret = dup(fd); | |
128 | if (ret != -1) { | |
129 | qemu_set_cloexec(ret); | |
130 | } | |
131 | #endif | |
132 | if (ret == -1) { | |
133 | goto fail; | |
134 | } | |
135 | ||
136 | dup_flags = fcntl(ret, F_GETFL); | |
137 | if (dup_flags == -1) { | |
138 | goto fail; | |
139 | } | |
140 | ||
141 | if ((flags & O_SYNC) != (dup_flags & O_SYNC)) { | |
142 | errno = EINVAL; | |
143 | goto fail; | |
144 | } | |
145 | ||
146 | /* Set/unset flags that we can with fcntl */ | |
3b6eda2f | 147 | if (fcntl(ret, F_SETFL, flags) == -1) { |
adb696f3 CB |
148 | goto fail; |
149 | } | |
150 | ||
151 | /* Truncate the file in the cases that open() would truncate it */ | |
152 | if (flags & O_TRUNC || | |
153 | ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) { | |
154 | if (ftruncate(ret, 0) == -1) { | |
155 | goto fail; | |
156 | } | |
157 | } | |
158 | ||
159 | return ret; | |
160 | ||
161 | fail: | |
162 | serrno = errno; | |
163 | if (ret != -1) { | |
164 | close(ret); | |
165 | } | |
166 | errno = serrno; | |
167 | return -1; | |
168 | } | |
0100fbbe PB |
169 | |
170 | static int qemu_parse_fdset(const char *param) | |
171 | { | |
172 | return qemu_parse_fd(param); | |
173 | } | |
adb696f3 | 174 | #endif |
03ff3ca3 | 175 | |
40ff6d7e KW |
176 | /* |
177 | * Opens a file with FD_CLOEXEC set | |
178 | */ | |
179 | int qemu_open(const char *name, int flags, ...) | |
180 | { | |
181 | int ret; | |
182 | int mode = 0; | |
183 | ||
adb696f3 CB |
184 | #ifndef _WIN32 |
185 | const char *fdset_id_str; | |
186 | ||
187 | /* Attempt dup of fd from fd set */ | |
188 | if (strstart(name, "/dev/fdset/", &fdset_id_str)) { | |
189 | int64_t fdset_id; | |
190 | int fd, dupfd; | |
191 | ||
192 | fdset_id = qemu_parse_fdset(fdset_id_str); | |
193 | if (fdset_id == -1) { | |
194 | errno = EINVAL; | |
195 | return -1; | |
196 | } | |
197 | ||
198 | fd = monitor_fdset_get_fd(fdset_id, flags); | |
199 | if (fd == -1) { | |
200 | return -1; | |
201 | } | |
202 | ||
203 | dupfd = qemu_dup_flags(fd, flags); | |
204 | if (dupfd == -1) { | |
205 | return -1; | |
206 | } | |
207 | ||
208 | ret = monitor_fdset_dup_fd_add(fdset_id, dupfd); | |
209 | if (ret == -1) { | |
210 | close(dupfd); | |
211 | errno = EINVAL; | |
212 | return -1; | |
213 | } | |
214 | ||
215 | return dupfd; | |
216 | } | |
217 | #endif | |
218 | ||
40ff6d7e KW |
219 | if (flags & O_CREAT) { |
220 | va_list ap; | |
221 | ||
222 | va_start(ap, flags); | |
223 | mode = va_arg(ap, int); | |
224 | va_end(ap); | |
225 | } | |
226 | ||
227 | #ifdef O_CLOEXEC | |
228 | ret = open(name, flags | O_CLOEXEC, mode); | |
229 | #else | |
230 | ret = open(name, flags, mode); | |
231 | if (ret >= 0) { | |
232 | qemu_set_cloexec(ret); | |
233 | } | |
03ff3ca3 | 234 | #endif |
40ff6d7e KW |
235 | |
236 | return ret; | |
237 | } | |
238 | ||
2e1e79da CB |
239 | int qemu_close(int fd) |
240 | { | |
adb696f3 CB |
241 | int64_t fdset_id; |
242 | ||
243 | /* Close fd that was dup'd from an fdset */ | |
244 | fdset_id = monitor_fdset_dup_fd_find(fd); | |
245 | if (fdset_id != -1) { | |
246 | int ret; | |
247 | ||
248 | ret = close(fd); | |
249 | if (ret == 0) { | |
250 | monitor_fdset_dup_fd_remove(fd); | |
251 | } | |
252 | ||
253 | return ret; | |
254 | } | |
255 | ||
2e1e79da CB |
256 | return close(fd); |
257 | } | |
258 | ||
7b5f699d KS |
259 | /* |
260 | * A variant of write(2) which handles partial write. | |
261 | * | |
262 | * Return the number of bytes transferred. | |
263 | * Set errno if fewer than `count' bytes are written. | |
1298cb68 JQ |
264 | * |
265 | * This function don't work with non-blocking fd's. | |
266 | * Any of the possibilities with non-bloking fd's is bad: | |
267 | * - return a short write (then name is wrong) | |
268 | * - busy wait adding (errno == EAGAIN) to the loop | |
7b5f699d KS |
269 | */ |
270 | ssize_t qemu_write_full(int fd, const void *buf, size_t count) | |
271 | { | |
272 | ssize_t ret = 0; | |
273 | ssize_t total = 0; | |
274 | ||
275 | while (count) { | |
276 | ret = write(fd, buf, count); | |
277 | if (ret < 0) { | |
278 | if (errno == EINTR) | |
279 | continue; | |
280 | break; | |
281 | } | |
282 | ||
283 | count -= ret; | |
284 | buf += ret; | |
285 | total += ret; | |
286 | } | |
287 | ||
288 | return total; | |
289 | } | |
290 | ||
40ff6d7e KW |
291 | /* |
292 | * Opens a socket with FD_CLOEXEC set | |
293 | */ | |
294 | int qemu_socket(int domain, int type, int protocol) | |
295 | { | |
296 | int ret; | |
297 | ||
298 | #ifdef SOCK_CLOEXEC | |
299 | ret = socket(domain, type | SOCK_CLOEXEC, protocol); | |
3a03bfa5 AP |
300 | if (ret != -1 || errno != EINVAL) { |
301 | return ret; | |
302 | } | |
303 | #endif | |
40ff6d7e KW |
304 | ret = socket(domain, type, protocol); |
305 | if (ret >= 0) { | |
306 | qemu_set_cloexec(ret); | |
307 | } | |
40ff6d7e KW |
308 | |
309 | return ret; | |
310 | } | |
311 | ||
312 | /* | |
313 | * Accept a connection and set FD_CLOEXEC | |
314 | */ | |
315 | int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) | |
316 | { | |
317 | int ret; | |
318 | ||
319 | #ifdef CONFIG_ACCEPT4 | |
320 | ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); | |
347ed55c | 321 | if (ret != -1 || errno != ENOSYS) { |
3a03bfa5 AP |
322 | return ret; |
323 | } | |
324 | #endif | |
40ff6d7e KW |
325 | ret = accept(s, addr, addrlen); |
326 | if (ret >= 0) { | |
327 | qemu_set_cloexec(ret); | |
328 | } | |
40ff6d7e KW |
329 | |
330 | return ret; | |
331 | } | |
993295fe PB |
332 | |
333 | /* | |
334 | * A variant of send(2) which handles partial write. | |
335 | * | |
336 | * Return the number of bytes transferred, which is only | |
337 | * smaller than `count' if there is an error. | |
338 | * | |
339 | * This function won't work with non-blocking fd's. | |
340 | * Any of the possibilities with non-bloking fd's is bad: | |
341 | * - return a short write (then name is wrong) | |
342 | * - busy wait adding (errno == EAGAIN) to the loop | |
343 | */ | |
344 | ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags) | |
345 | { | |
346 | ssize_t ret = 0; | |
347 | ssize_t total = 0; | |
348 | ||
349 | while (count) { | |
350 | ret = send(fd, buf, count, flags); | |
351 | if (ret < 0) { | |
352 | if (errno == EINTR) { | |
353 | continue; | |
354 | } | |
355 | break; | |
356 | } | |
357 | ||
358 | count -= ret; | |
359 | buf += ret; | |
360 | total += ret; | |
361 | } | |
362 | ||
363 | return total; | |
364 | } | |
365 | ||
366 | /* | |
367 | * A variant of recv(2) which handles partial write. | |
368 | * | |
369 | * Return the number of bytes transferred, which is only | |
370 | * smaller than `count' if there is an error. | |
371 | * | |
372 | * This function won't work with non-blocking fd's. | |
373 | * Any of the possibilities with non-bloking fd's is bad: | |
374 | * - return a short write (then name is wrong) | |
375 | * - busy wait adding (errno == EAGAIN) to the loop | |
376 | */ | |
377 | ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags) | |
378 | { | |
379 | ssize_t ret = 0; | |
380 | ssize_t total = 0; | |
381 | ||
382 | while (count) { | |
383 | ret = qemu_recv(fd, buf, count, flags); | |
384 | if (ret <= 0) { | |
385 | if (ret < 0 && errno == EINTR) { | |
386 | continue; | |
387 | } | |
388 | break; | |
389 | } | |
390 | ||
391 | count -= ret; | |
392 | buf += ret; | |
393 | total += ret; | |
394 | } | |
395 | ||
396 | return total; | |
397 | } | |
398 | ||
93bfef4c CV |
399 | void qemu_set_version(const char *version) |
400 | { | |
401 | qemu_version = version; | |
402 | } | |
403 | ||
404 | const char *qemu_get_version(void) | |
405 | { | |
406 | return qemu_version; | |
407 | } | |
0f66998f PM |
408 | |
409 | void fips_set_state(bool requested) | |
410 | { | |
411 | #ifdef __linux__ | |
412 | if (requested) { | |
413 | FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r"); | |
414 | if (fds != NULL) { | |
415 | fips_enabled = (fgetc(fds) == '1'); | |
416 | fclose(fds); | |
417 | } | |
418 | } | |
419 | #else | |
420 | fips_enabled = false; | |
421 | #endif /* __linux__ */ | |
422 | ||
423 | #ifdef _FIPS_DEBUG | |
424 | fprintf(stderr, "FIPS mode %s (requested %s)\n", | |
425 | (fips_enabled ? "enabled" : "disabled"), | |
426 | (requested ? "enabled" : "disabled")); | |
427 | #endif | |
428 | } | |
429 | ||
430 | bool fips_get_state(void) | |
431 | { | |
432 | return fips_enabled; | |
433 | } | |
0100fbbe | 434 |