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25#include "qemu/osdep.h"
26#include "qapi/error.h"
27#include "chardev/char.h"
28#include "io/channel-file.h"
29#include "qemu/sockets.h"
30#include "qemu/error-report.h"
31#include "qemu/module.h"
32#include "qemu/qemu-print.h"
33
34#include "chardev/char-io.h"
35#include "qom/object.h"
36
37struct PtyChardev {
38 Chardev parent;
39 QIOChannel *ioc;
40 int read_bytes;
41
42 int connected;
43 GSource *timer_src;
44};
45typedef struct PtyChardev PtyChardev;
46
47DECLARE_INSTANCE_CHECKER(PtyChardev, PTY_CHARDEV,
48 TYPE_CHARDEV_PTY)
49
50static void pty_chr_state(Chardev *chr, int connected);
51
52static 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
61static gboolean pty_chr_timer(gpointer opaque)
62{
63 struct Chardev *chr = CHARDEV(opaque);
64 PtyChardev *s = PTY_CHARDEV(opaque);
65
66 pty_chr_timer_cancel(s);
67 if (!s->connected) {
68
69 qemu_chr_be_update_read_handlers(chr, chr->gcontext);
70 }
71 return FALSE;
72}
73
74static void pty_chr_rearm_timer(Chardev *chr, int ms)
75{
76 PtyChardev *s = PTY_CHARDEV(chr);
77 char *name;
78
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);
83 g_free(name);
84}
85
86static void pty_chr_update_read_handler(Chardev *chr)
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
108static 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) {
113 return len;
114 }
115 return io_channel_send(s->ioc, buf, len);
116}
117
118static 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
127static 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
136static 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
162static void pty_chr_state(Chardev *chr, int connected)
163{
164 PtyChardev *s = PTY_CHARDEV(chr);
165
166 if (!connected) {
167 remove_fd_in_watch(chr);
168 s->connected = 0;
169
170
171
172 pty_chr_rearm_timer(chr, 1000);
173 } else {
174 pty_chr_timer_cancel(s);
175 if (!s->connected) {
176 s->connected = 1;
177 qemu_chr_be_event(chr, CHR_EVENT_OPENED);
178 }
179 if (!chr->gsource) {
180 chr->gsource = io_add_watch_poll(chr, s->ioc,
181 pty_chr_read_poll,
182 pty_chr_read,
183 chr, chr->gcontext);
184 }
185 }
186}
187
188static void char_pty_finalize(Object *obj)
189{
190 Chardev *chr = CHARDEV(obj);
191 PtyChardev *s = PTY_CHARDEV(obj);
192
193 pty_chr_state(chr, 0);
194 object_unref(OBJECT(s->ioc));
195 pty_chr_timer_cancel(s);
196 qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
197}
198
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
219static 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
258err:
259 if (sfd != -1) {
260 close(sfd);
261 }
262 close(mfd);
263 return -1;
264}
265#endif
266
267static 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
282static 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
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
310static 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);
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 }
331
332 chr->filename = g_strdup_printf("pty:%s", pty_name);
333 qemu_printf("char device redirected to %s (label %s)\n",
334 pty_name, chr->label);
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);
341 s->timer_src = NULL;
342 *be_opened = false;
343}
344
345static 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
355static 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
363static void register_types(void)
364{
365 type_register_static(&char_pty_type_info);
366}
367
368type_init(register_types);
369
