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c3b7d620 MAL |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * | |
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 | */ | |
0b8fa32f | 24 | |
c3b7d620 MAL |
25 | #include "qemu/osdep.h" |
26 | #include "qapi/error.h" | |
8228e353 | 27 | #include "chardev/char.h" |
c3b7d620 MAL |
28 | #include "io/channel-file.h" |
29 | #include "qemu/sockets.h" | |
30 | #include "qemu/error-report.h" | |
0b8fa32f | 31 | #include "qemu/module.h" |
6ade45f2 | 32 | #include "qemu/qemu-print.h" |
c3b7d620 | 33 | |
8228e353 | 34 | #include "chardev/char-io.h" |
db1015e9 | 35 | #include "qom/object.h" |
c3b7d620 | 36 | |
db1015e9 | 37 | struct PtyChardev { |
c3b7d620 MAL |
38 | Chardev parent; |
39 | QIOChannel *ioc; | |
40 | int read_bytes; | |
41 | ||
c3b7d620 | 42 | int connected; |
2c716ba1 | 43 | GSource *timer_src; |
db1015e9 EH |
44 | }; |
45 | typedef struct PtyChardev PtyChardev; | |
c3b7d620 | 46 | |
8110fa1d EH |
47 | DECLARE_INSTANCE_CHECKER(PtyChardev, PTY_CHARDEV, |
48 | TYPE_CHARDEV_PTY) | |
c3b7d620 | 49 | |
c3b7d620 MAL |
50 | static void pty_chr_state(Chardev *chr, int connected); |
51 | ||
4e4b5734 PX |
52 | static void pty_chr_timer_cancel(PtyChardev *s) |
53 | { | |
54 | if (s->timer_src) { | |
55 | g_source_destroy(s->timer_src); | |
56 | g_source_unref(s->timer_src); | |
57 | s->timer_src = NULL; | |
58 | } | |
59 | } | |
60 | ||
c3b7d620 MAL |
61 | static gboolean pty_chr_timer(gpointer opaque) |
62 | { | |
63 | struct Chardev *chr = CHARDEV(opaque); | |
64 | PtyChardev *s = PTY_CHARDEV(opaque); | |
65 | ||
4e4b5734 | 66 | pty_chr_timer_cancel(s); |
c3b7d620 MAL |
67 | if (!s->connected) { |
68 | /* Next poll ... */ | |
f7ea2038 | 69 | qemu_chr_be_update_read_handlers(chr, chr->gcontext); |
c3b7d620 | 70 | } |
c3b7d620 MAL |
71 | return FALSE; |
72 | } | |
73 | ||
c3b7d620 MAL |
74 | static void pty_chr_rearm_timer(Chardev *chr, int ms) |
75 | { | |
76 | PtyChardev *s = PTY_CHARDEV(chr); | |
77 | char *name; | |
78 | ||
2c716ba1 PX |
79 | pty_chr_timer_cancel(s); |
80 | name = g_strdup_printf("pty-timer-%s", chr->label); | |
81 | s->timer_src = qemu_chr_timeout_add_ms(chr, ms, pty_chr_timer, chr); | |
82 | g_source_set_name(s->timer_src, name); | |
c3b7d620 MAL |
83 | g_free(name); |
84 | } | |
85 | ||
f7ea2038 | 86 | static void pty_chr_update_read_handler(Chardev *chr) |
c3b7d620 MAL |
87 | { |
88 | PtyChardev *s = PTY_CHARDEV(chr); | |
89 | GPollFD pfd; | |
90 | int rc; | |
91 | QIOChannelFile *fioc = QIO_CHANNEL_FILE(s->ioc); | |
92 | ||
93 | pfd.fd = fioc->fd; | |
94 | pfd.events = G_IO_OUT; | |
95 | pfd.revents = 0; | |
96 | do { | |
97 | rc = g_poll(&pfd, 1, 0); | |
98 | } while (rc == -1 && errno == EINTR); | |
99 | assert(rc >= 0); | |
100 | ||
101 | if (pfd.revents & G_IO_HUP) { | |
102 | pty_chr_state(chr, 0); | |
103 | } else { | |
104 | pty_chr_state(chr, 1); | |
105 | } | |
106 | } | |
107 | ||
c3b7d620 MAL |
108 | static int char_pty_chr_write(Chardev *chr, const uint8_t *buf, int len) |
109 | { | |
110 | PtyChardev *s = PTY_CHARDEV(chr); | |
111 | ||
112 | if (!s->connected) { | |
f8278c7d | 113 | return len; |
c3b7d620 MAL |
114 | } |
115 | return io_channel_send(s->ioc, buf, len); | |
116 | } | |
117 | ||
118 | static GSource *pty_chr_add_watch(Chardev *chr, GIOCondition cond) | |
119 | { | |
120 | PtyChardev *s = PTY_CHARDEV(chr); | |
121 | if (!s->connected) { | |
122 | return NULL; | |
123 | } | |
124 | return qio_channel_create_watch(s->ioc, cond); | |
125 | } | |
126 | ||
127 | static int pty_chr_read_poll(void *opaque) | |
128 | { | |
129 | Chardev *chr = CHARDEV(opaque); | |
130 | PtyChardev *s = PTY_CHARDEV(opaque); | |
131 | ||
132 | s->read_bytes = qemu_chr_be_can_write(chr); | |
133 | return s->read_bytes; | |
134 | } | |
135 | ||
136 | static gboolean pty_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque) | |
137 | { | |
138 | Chardev *chr = CHARDEV(opaque); | |
139 | PtyChardev *s = PTY_CHARDEV(opaque); | |
140 | gsize len; | |
141 | uint8_t buf[CHR_READ_BUF_LEN]; | |
142 | ssize_t ret; | |
143 | ||
144 | len = sizeof(buf); | |
145 | if (len > s->read_bytes) { | |
146 | len = s->read_bytes; | |
147 | } | |
148 | if (len == 0) { | |
149 | return TRUE; | |
150 | } | |
151 | ret = qio_channel_read(s->ioc, (char *)buf, len, NULL); | |
152 | if (ret <= 0) { | |
153 | pty_chr_state(chr, 0); | |
154 | return FALSE; | |
155 | } else { | |
156 | pty_chr_state(chr, 1); | |
157 | qemu_chr_be_write(chr, buf, ret); | |
158 | } | |
159 | return TRUE; | |
160 | } | |
161 | ||
c3b7d620 MAL |
162 | static void pty_chr_state(Chardev *chr, int connected) |
163 | { | |
164 | PtyChardev *s = PTY_CHARDEV(chr); | |
165 | ||
166 | if (!connected) { | |
b19456dd | 167 | remove_fd_in_watch(chr); |
c3b7d620 MAL |
168 | s->connected = 0; |
169 | /* (re-)connect poll interval for idle guests: once per second. | |
170 | * We check more frequently in case the guests sends data to | |
171 | * the virtual device linked to our pty. */ | |
172 | pty_chr_rearm_timer(chr, 1000); | |
173 | } else { | |
2c716ba1 | 174 | pty_chr_timer_cancel(s); |
c3b7d620 | 175 | if (!s->connected) { |
c3b7d620 | 176 | s->connected = 1; |
f7ea2038 | 177 | qemu_chr_be_event(chr, CHR_EVENT_OPENED); |
c3b7d620 | 178 | } |
b19456dd HZ |
179 | if (!chr->gsource) { |
180 | chr->gsource = io_add_watch_poll(chr, s->ioc, | |
c3b7d620 MAL |
181 | pty_chr_read_poll, |
182 | pty_chr_read, | |
6bbb6c06 | 183 | chr, chr->gcontext); |
c3b7d620 MAL |
184 | } |
185 | } | |
186 | } | |
187 | ||
188 | static void char_pty_finalize(Object *obj) | |
189 | { | |
190 | Chardev *chr = CHARDEV(obj); | |
191 | PtyChardev *s = PTY_CHARDEV(obj); | |
192 | ||
c3b7d620 MAL |
193 | pty_chr_state(chr, 0); |
194 | object_unref(OBJECT(s->ioc)); | |
2c716ba1 | 195 | pty_chr_timer_cancel(s); |
c3b7d620 MAL |
196 | qemu_chr_be_event(chr, CHR_EVENT_CLOSED); |
197 | } | |
198 | ||
3f6c2e8b MAL |
199 | #if defined HAVE_PTY_H |
200 | # include <pty.h> | |
201 | #elif defined CONFIG_BSD | |
202 | # include <termios.h> | |
203 | # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) | |
204 | # include <libutil.h> | |
205 | # else | |
206 | # include <util.h> | |
207 | # endif | |
208 | #elif defined CONFIG_SOLARIS | |
209 | # include <termios.h> | |
210 | # include <stropts.h> | |
211 | #else | |
212 | # include <termios.h> | |
213 | #endif | |
214 | ||
215 | #ifdef __sun__ | |
216 | ||
217 | #if !defined(HAVE_OPENPTY) | |
218 | /* Once illumos has openpty(), this is going to be removed. */ | |
219 | static int openpty(int *amaster, int *aslave, char *name, | |
220 | struct termios *termp, struct winsize *winp) | |
221 | { | |
222 | const char *slave; | |
223 | int mfd = -1, sfd = -1; | |
224 | ||
225 | *amaster = *aslave = -1; | |
226 | ||
227 | mfd = open("/dev/ptmx", O_RDWR | O_NOCTTY); | |
228 | if (mfd < 0) { | |
229 | goto err; | |
230 | } | |
231 | ||
232 | if (grantpt(mfd) == -1 || unlockpt(mfd) == -1) { | |
233 | goto err; | |
234 | } | |
235 | ||
236 | if ((slave = ptsname(mfd)) == NULL) { | |
237 | goto err; | |
238 | } | |
239 | ||
240 | if ((sfd = open(slave, O_RDONLY | O_NOCTTY)) == -1) { | |
241 | goto err; | |
242 | } | |
243 | ||
244 | if (ioctl(sfd, I_PUSH, "ptem") == -1 || | |
245 | (termp != NULL && tcgetattr(sfd, termp) < 0)) { | |
246 | goto err; | |
247 | } | |
248 | ||
249 | *amaster = mfd; | |
250 | *aslave = sfd; | |
251 | ||
252 | if (winp) { | |
253 | ioctl(sfd, TIOCSWINSZ, winp); | |
254 | } | |
255 | ||
256 | return 0; | |
257 | ||
258 | err: | |
259 | if (sfd != -1) { | |
260 | close(sfd); | |
261 | } | |
262 | close(mfd); | |
263 | return -1; | |
264 | } | |
265 | #endif | |
266 | ||
267 | static void cfmakeraw (struct termios *termios_p) | |
268 | { | |
269 | termios_p->c_iflag &= | |
270 | ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON); | |
271 | termios_p->c_oflag &= ~OPOST; | |
272 | termios_p->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN); | |
273 | termios_p->c_cflag &= ~(CSIZE | PARENB); | |
274 | termios_p->c_cflag |= CS8; | |
275 | ||
276 | termios_p->c_cc[VMIN] = 0; | |
277 | termios_p->c_cc[VTIME] = 0; | |
278 | } | |
279 | #endif | |
280 | ||
281 | /* like openpty() but also makes it raw; return master fd */ | |
282 | static int qemu_openpty_raw(int *aslave, char *pty_name) | |
283 | { | |
284 | int amaster; | |
285 | struct termios tty; | |
286 | #if defined(__OpenBSD__) || defined(__DragonFly__) | |
287 | char pty_buf[PATH_MAX]; | |
288 | #define q_ptsname(x) pty_buf | |
289 | #else | |
290 | char *pty_buf = NULL; | |
291 | #define q_ptsname(x) ptsname(x) | |
292 | #endif | |
293 | ||
294 | if (openpty(&amaster, aslave, pty_buf, NULL, NULL) < 0) { | |
295 | return -1; | |
296 | } | |
297 | ||
298 | /* Set raw attributes on the pty. */ | |
299 | tcgetattr(*aslave, &tty); | |
300 | cfmakeraw(&tty); | |
301 | tcsetattr(*aslave, TCSAFLUSH, &tty); | |
302 | ||
303 | if (pty_name) { | |
304 | strcpy(pty_name, q_ptsname(amaster)); | |
305 | } | |
306 | ||
307 | return amaster; | |
308 | } | |
309 | ||
c3b7d620 MAL |
310 | static void char_pty_open(Chardev *chr, |
311 | ChardevBackend *backend, | |
312 | bool *be_opened, | |
313 | Error **errp) | |
314 | { | |
315 | PtyChardev *s; | |
316 | int master_fd, slave_fd; | |
317 | char pty_name[PATH_MAX]; | |
318 | char *name; | |
319 | ||
320 | master_fd = qemu_openpty_raw(&slave_fd, pty_name); | |
321 | if (master_fd < 0) { | |
322 | error_setg_errno(errp, errno, "Failed to create PTY"); | |
323 | return; | |
324 | } | |
325 | ||
326 | close(slave_fd); | |
b84bb4df MAL |
327 | if (!g_unix_set_fd_nonblocking(master_fd, true, NULL)) { |
328 | error_setg_errno(errp, errno, "Failed to set FD nonblocking"); | |
329 | return; | |
330 | } | |
c3b7d620 MAL |
331 | |
332 | chr->filename = g_strdup_printf("pty:%s", pty_name); | |
6ade45f2 MA |
333 | qemu_printf("char device redirected to %s (label %s)\n", |
334 | pty_name, chr->label); | |
c3b7d620 MAL |
335 | |
336 | s = PTY_CHARDEV(chr); | |
337 | s->ioc = QIO_CHANNEL(qio_channel_file_new_fd(master_fd)); | |
338 | name = g_strdup_printf("chardev-pty-%s", chr->label); | |
339 | qio_channel_set_name(QIO_CHANNEL(s->ioc), name); | |
340 | g_free(name); | |
2c716ba1 | 341 | s->timer_src = NULL; |
c3b7d620 MAL |
342 | *be_opened = false; |
343 | } | |
344 | ||
345 | static void char_pty_class_init(ObjectClass *oc, void *data) | |
346 | { | |
347 | ChardevClass *cc = CHARDEV_CLASS(oc); | |
348 | ||
349 | cc->open = char_pty_open; | |
350 | cc->chr_write = char_pty_chr_write; | |
351 | cc->chr_update_read_handler = pty_chr_update_read_handler; | |
352 | cc->chr_add_watch = pty_chr_add_watch; | |
353 | } | |
354 | ||
355 | static const TypeInfo char_pty_type_info = { | |
356 | .name = TYPE_CHARDEV_PTY, | |
357 | .parent = TYPE_CHARDEV, | |
358 | .instance_size = sizeof(PtyChardev), | |
359 | .instance_finalize = char_pty_finalize, | |
360 | .class_init = char_pty_class_init, | |
361 | }; | |
362 | ||
363 | static void register_types(void) | |
364 | { | |
365 | type_register_static(&char_pty_type_info); | |
366 | } | |
367 | ||
368 | type_init(register_types); |