summaryrefslogtreecommitdiff
path: root/osdep.c
blob: 3a63d26e75c0556a0d9e718a6c3281b904f61447 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
/*
 * QEMU low level functions
 *
 * Copyright (c) 2003 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>

/* Needed early for CONFIG_BSD etc. */
#include "config-host.h"

#if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE)
#include <sys/mman.h>
#endif

#ifdef CONFIG_SOLARIS
#include <sys/types.h>
#include <sys/statvfs.h>
/* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for
   discussion about Solaris header problems */
extern int madvise(caddr_t, size_t, int);
#endif

#include "qemu-common.h"
#include "trace.h"
#include "qemu_socket.h"
#include "monitor.h"

static bool fips_enabled = false;

static const char *qemu_version = QEMU_VERSION;

int socket_set_cork(int fd, int v)
{
#if defined(SOL_TCP) && defined(TCP_CORK)
    return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v));
#else
    return 0;
#endif
}

int qemu_madvise(void *addr, size_t len, int advice)
{
    if (advice == QEMU_MADV_INVALID) {
        errno = EINVAL;
        return -1;
    }
#if defined(CONFIG_MADVISE)
    return madvise(addr, len, advice);
#elif defined(CONFIG_POSIX_MADVISE)
    return posix_madvise(addr, len, advice);
#else
    errno = EINVAL;
    return -1;
#endif
}

#ifndef _WIN32
/*
 * Dups an fd and sets the flags
 */
static int qemu_dup_flags(int fd, int flags)
{
    int ret;
    int serrno;
    int dup_flags;

#ifdef F_DUPFD_CLOEXEC
    ret = fcntl(fd, F_DUPFD_CLOEXEC, 0);
#else
    ret = dup(fd);
    if (ret != -1) {
        qemu_set_cloexec(ret);
    }
#endif
    if (ret == -1) {
        goto fail;
    }

    dup_flags = fcntl(ret, F_GETFL);
    if (dup_flags == -1) {
        goto fail;
    }

    if ((flags & O_SYNC) != (dup_flags & O_SYNC)) {
        errno = EINVAL;
        goto fail;
    }

    /* Set/unset flags that we can with fcntl */
    if (fcntl(ret, F_SETFL, flags) == -1) {
        goto fail;
    }

    /* Truncate the file in the cases that open() would truncate it */
    if (flags & O_TRUNC ||
            ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))) {
        if (ftruncate(ret, 0) == -1) {
            goto fail;
        }
    }

    return ret;

fail:
    serrno = errno;
    if (ret != -1) {
        close(ret);
    }
    errno = serrno;
    return -1;
}

static int qemu_parse_fdset(const char *param)
{
    return qemu_parse_fd(param);
}
#endif

/*
 * Opens a file with FD_CLOEXEC set
 */
int qemu_open(const char *name, int flags, ...)
{
    int ret;
    int mode = 0;

#ifndef _WIN32
    const char *fdset_id_str;

    /* Attempt dup of fd from fd set */
    if (strstart(name, "/dev/fdset/", &fdset_id_str)) {
        int64_t fdset_id;
        int fd, dupfd;

        fdset_id = qemu_parse_fdset(fdset_id_str);
        if (fdset_id == -1) {
            errno = EINVAL;
            return -1;
        }

        fd = monitor_fdset_get_fd(fdset_id, flags);
        if (fd == -1) {
            return -1;
        }

        dupfd = qemu_dup_flags(fd, flags);
        if (dupfd == -1) {
            return -1;
        }

        ret = monitor_fdset_dup_fd_add(fdset_id, dupfd);
        if (ret == -1) {
            close(dupfd);
            errno = EINVAL;
            return -1;
        }

        return dupfd;
    }
#endif

    if (flags & O_CREAT) {
        va_list ap;

        va_start(ap, flags);
        mode = va_arg(ap, int);
        va_end(ap);
    }

#ifdef O_CLOEXEC
    ret = open(name, flags | O_CLOEXEC, mode);
#else
    ret = open(name, flags, mode);
    if (ret >= 0) {
        qemu_set_cloexec(ret);
    }
#endif

    return ret;
}

int qemu_close(int fd)
{
    int64_t fdset_id;

    /* Close fd that was dup'd from an fdset */
    fdset_id = monitor_fdset_dup_fd_find(fd);
    if (fdset_id != -1) {
        int ret;

        ret = close(fd);
        if (ret == 0) {
            monitor_fdset_dup_fd_remove(fd);
        }

        return ret;
    }

    return close(fd);
}

/*
 * A variant of write(2) which handles partial write.
 *
 * Return the number of bytes transferred.
 * Set errno if fewer than `count' bytes are written.
 *
 * This function don't work with non-blocking fd's.
 * Any of the possibilities with non-bloking fd's is bad:
 *   - return a short write (then name is wrong)
 *   - busy wait adding (errno == EAGAIN) to the loop
 */
ssize_t qemu_write_full(int fd, const void *buf, size_t count)
{
    ssize_t ret = 0;
    ssize_t total = 0;

    while (count) {
        ret = write(fd, buf, count);
        if (ret < 0) {
            if (errno == EINTR)
                continue;
            break;
        }

        count -= ret;
        buf += ret;
        total += ret;
    }

    return total;
}

/*
 * Opens a socket with FD_CLOEXEC set
 */
int qemu_socket(int domain, int type, int protocol)
{
    int ret;

#ifdef SOCK_CLOEXEC
    ret = socket(domain, type | SOCK_CLOEXEC, protocol);
    if (ret != -1 || errno != EINVAL) {
        return ret;
    }
#endif
    ret = socket(domain, type, protocol);
    if (ret >= 0) {
        qemu_set_cloexec(ret);
    }

    return ret;
}

/*
 * Accept a connection and set FD_CLOEXEC
 */
int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
    int ret;

#ifdef CONFIG_ACCEPT4
    ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
    if (ret != -1 || errno != ENOSYS) {
        return ret;
    }
#endif
    ret = accept(s, addr, addrlen);
    if (ret >= 0) {
        qemu_set_cloexec(ret);
    }

    return ret;
}

/*
 * A variant of send(2) which handles partial write.
 *
 * Return the number of bytes transferred, which is only
 * smaller than `count' if there is an error.
 *
 * This function won't work with non-blocking fd's.
 * Any of the possibilities with non-bloking fd's is bad:
 *   - return a short write (then name is wrong)
 *   - busy wait adding (errno == EAGAIN) to the loop
 */
ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags)
{
    ssize_t ret = 0;
    ssize_t total = 0;

    while (count) {
        ret = send(fd, buf, count, flags);
        if (ret < 0) {
            if (errno == EINTR) {
                continue;
            }
            break;
        }

        count -= ret;
        buf += ret;
        total += ret;
    }

    return total;
}

/*
 * A variant of recv(2) which handles partial write.
 *
 * Return the number of bytes transferred, which is only
 * smaller than `count' if there is an error.
 *
 * This function won't work with non-blocking fd's.
 * Any of the possibilities with non-bloking fd's is bad:
 *   - return a short write (then name is wrong)
 *   - busy wait adding (errno == EAGAIN) to the loop
 */
ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags)
{
    ssize_t ret = 0;
    ssize_t total = 0;

    while (count) {
        ret = qemu_recv(fd, buf, count, flags);
        if (ret <= 0) {
            if (ret < 0 && errno == EINTR) {
                continue;
            }
            break;
        }

        count -= ret;
        buf += ret;
        total += ret;
    }

    return total;
}

void qemu_set_version(const char *version)
{
    qemu_version = version;
}

const char *qemu_get_version(void)
{
    return qemu_version;
}

void fips_set_state(bool requested)
{
#ifdef __linux__
    if (requested) {
        FILE *fds = fopen("/proc/sys/crypto/fips_enabled", "r");
        if (fds != NULL) {
            fips_enabled = (fgetc(fds) == '1');
            fclose(fds);
        }
    }
#else
    fips_enabled = false;
#endif /* __linux__ */

#ifdef _FIPS_DEBUG
    fprintf(stderr, "FIPS mode %s (requested %s)\n",
	    (fips_enabled ? "enabled" : "disabled"),
	    (requested ? "enabled" : "disabled"));
#endif
}

bool fips_get_state(void)
{
    return fips_enabled;
}