[qemu.git] / qga / channel-posix.c

#include "qemu/osdep.h"
#include <glib.h>
#include <termios.h>
#include "qemu/sockets.h"
#include "qga/channel.h"

#ifdef CONFIG_SOLARIS
#include <stropts.h>
#endif

#define GA_CHANNEL_BAUDRATE_DEFAULT B38400 /* for isa-serial channels */

struct GAChannel {
    GIOChannel *listen_channel;
    GIOChannel *client_channel;
    GAChannelMethod method;
    GAChannelCallback event_cb;
    gpointer user_data;
};

static int ga_channel_client_add(GAChannel *c, int fd);

static gboolean ga_channel_listen_accept(GIOChannel *channel,
                                         GIOCondition condition, gpointer data)
{
    GAChannel *c = data;
    int ret, client_fd;
    bool accepted = false;
    struct sockaddr_un addr;
    socklen_t addrlen = sizeof(addr);

    g_assert(channel != NULL);

    client_fd = qemu_accept(g_io_channel_unix_get_fd(channel),
                            (struct sockaddr *)&addr, &addrlen);
    if (client_fd == -1) {
        g_warning("error converting fd to gsocket: %s", strerror(errno));
        goto out;
    }
    qemu_set_nonblock(client_fd);
    ret = ga_channel_client_add(c, client_fd);
    if (ret) {
        g_warning("error setting up connection");
        close(client_fd);
        goto out;
    }
    accepted = true;

out:
    /* only accept 1 connection at a time */
    return !accepted;
}

/* start polling for readable events on listen fd, new==true
 * indicates we should use the existing s->listen_channel
 */
static void ga_channel_listen_add(GAChannel *c, int listen_fd, bool create)
{
    if (create) {
        c->listen_channel = g_io_channel_unix_new(listen_fd);
    }
    g_io_add_watch(c->listen_channel, G_IO_IN, ga_channel_listen_accept, c);
}

static void ga_channel_listen_close(GAChannel *c)
{
    g_assert(c->method == GA_CHANNEL_UNIX_LISTEN);
    g_assert(c->listen_channel);
    g_io_channel_shutdown(c->listen_channel, true, NULL);
    g_io_channel_unref(c->listen_channel);
    c->listen_channel = NULL;
}

/* cleanup state for closed connection/session, start accepting new
 * connections if we're in listening mode
 */
static void ga_channel_client_close(GAChannel *c)
{
    g_assert(c->client_channel);
    g_io_channel_shutdown(c->client_channel, true, NULL);
    g_io_channel_unref(c->client_channel);
    c->client_channel = NULL;
    if (c->method == GA_CHANNEL_UNIX_LISTEN && c->listen_channel) {
        ga_channel_listen_add(c, 0, false);
    }
}

static gboolean ga_channel_client_event(GIOChannel *channel,
                                        GIOCondition condition, gpointer data)
{
    GAChannel *c = data;
    gboolean client_cont;

    g_assert(c);
    if (c->event_cb) {
        client_cont = c->event_cb(condition, c->user_data);
        if (!client_cont) {
            ga_channel_client_close(c);
            return false;
        }
    }
    return true;
}

static int ga_channel_client_add(GAChannel *c, int fd)
{
    GIOChannel *client_channel;
    GError *err = NULL;

    g_assert(c && !c->client_channel);
    client_channel = g_io_channel_unix_new(fd);
    g_assert(client_channel);
    g_io_channel_set_encoding(client_channel, NULL, &err);
    if (err != NULL) {
        g_warning("error setting channel encoding to binary");
        g_error_free(err);
        return -1;
    }
    g_io_add_watch(client_channel, G_IO_IN | G_IO_HUP,
                   ga_channel_client_event, c);
    c->client_channel = client_channel;
    return 0;
}

static gboolean ga_channel_open(GAChannel *c, const gchar *path, GAChannelMethod method)
{
    int ret;
    c->method = method;

    switch (c->method) {
    case GA_CHANNEL_VIRTIO_SERIAL: {
        int fd = qemu_open(path, O_RDWR | O_NONBLOCK
#ifndef CONFIG_SOLARIS
                           | O_ASYNC
#endif
                           );
        if (fd == -1) {
            g_critical("error opening channel: %s", strerror(errno));
            return false;
        }
#ifdef CONFIG_SOLARIS
        ret = ioctl(fd, I_SETSIG, S_OUTPUT | S_INPUT | S_HIPRI);
        if (ret == -1) {
            g_critical("error setting event mask for channel: %s",
                       strerror(errno));
            close(fd);
            return false;
        }
#endif
        ret = ga_channel_client_add(c, fd);
        if (ret) {
            g_critical("error adding channel to main loop");
            close(fd);
            return false;
        }
        break;
    }
    case GA_CHANNEL_ISA_SERIAL: {
        struct termios tio;
        int fd = qemu_open(path, O_RDWR | O_NOCTTY | O_NONBLOCK);
        if (fd == -1) {
            g_critical("error opening channel: %s", strerror(errno));
            return false;
        }
        tcgetattr(fd, &tio);
        /* set up serial port for non-canonical, dumb byte streaming */
        tio.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | ISTRIP |
                         INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY |
                         IMAXBEL);
        tio.c_oflag = 0;
        tio.c_lflag = 0;
        tio.c_cflag |= GA_CHANNEL_BAUDRATE_DEFAULT;
        /* 1 available byte min or reads will block (we'll set non-blocking
         * elsewhere, else we have to deal with read()=0 instead)
         */
        tio.c_cc[VMIN] = 1;
        tio.c_cc[VTIME] = 0;
        /* flush everything waiting for read/xmit, it's garbage at this point */
        tcflush(fd, TCIFLUSH);
        tcsetattr(fd, TCSANOW, &tio);
        ret = ga_channel_client_add(c, fd);
        if (ret) {
            g_critical("error adding channel to main loop");
            close(fd);
            return false;
        }
        break;
    }
    case GA_CHANNEL_UNIX_LISTEN: {
        Error *local_err = NULL;
        int fd = unix_listen(path, NULL, strlen(path), &local_err);
        if (local_err != NULL) {
            g_critical("%s", error_get_pretty(local_err));
            error_free(local_err);
            return false;
        }
        ga_channel_listen_add(c, fd, true);
        break;
    }
    default:
        g_critical("error binding/listening to specified socket");
        return false;
    }

    return true;
}

GIOStatus ga_channel_write_all(GAChannel *c, const gchar *buf, gsize size)
{
    GError *err = NULL;
    gsize written = 0;
    GIOStatus status = G_IO_STATUS_NORMAL;

    while (size) {
        g_debug("sending data, count: %d", (int)size);
        status = g_io_channel_write_chars(c->client_channel, buf, size,
                                          &written, &err);
        if (status == G_IO_STATUS_NORMAL) {
            size -= written;
            buf += written;
        } else if (status != G_IO_STATUS_AGAIN) {
            g_warning("error writing to channel: %s", err->message);
            return status;
        }
    }

    do {
        status = g_io_channel_flush(c->client_channel, &err);
    } while (status == G_IO_STATUS_AGAIN);

    if (status != G_IO_STATUS_NORMAL) {
        g_warning("error flushing channel: %s", err->message);
    }

    return status;
}

GIOStatus ga_channel_read(GAChannel *c, gchar *buf, gsize size, gsize *count)
{
    return g_io_channel_read_chars(c->client_channel, buf, size, count, NULL);
}

GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path,
                          GAChannelCallback cb, gpointer opaque)
{
    GAChannel *c = g_new0(GAChannel, 1);
    c->event_cb = cb;
    c->user_data = opaque;

    if (!ga_channel_open(c, path, method)) {
        g_critical("error opening channel");
        ga_channel_free(c);
        return NULL;
    }

    return c;
}

void ga_channel_free(GAChannel *c)
{
    if (c->method == GA_CHANNEL_UNIX_LISTEN
        && c->listen_channel) {
        ga_channel_listen_close(c);
    }
    if (c->client_channel) {
        ga_channel_client_close(c);
    }
    g_free(c);
}
Commit	Line	Data
4459bf38	1	#include "qemu/osdep.h"
125b310e MR	2	#include <glib.h>
125b310e MR	3	#include <termios.h>
1de7afc9	4	#include "qemu/sockets.h"
125b310e MR	5	#include "qga/channel.h"
125b310e MR	6
e61ab1da AF	7	#ifdef CONFIG_SOLARIS
	8	#include <stropts.h>
	9	#endif
	10
125b310e MR	11	#define GA_CHANNEL_BAUDRATE_DEFAULT B38400 /* for isa-serial channels */
	12
	13	struct GAChannel {
	14	GIOChannel *listen_channel;
	15	GIOChannel *client_channel;
	16	GAChannelMethod method;
	17	GAChannelCallback event_cb;
	18	gpointer user_data;
	19	};
	20
	21	static int ga_channel_client_add(GAChannel *c, int fd);
	22
	23	static gboolean ga_channel_listen_accept(GIOChannel *channel,
	24	GIOCondition condition, gpointer data)
	25	{
	26	GAChannel *c = data;
	27	int ret, client_fd;
	28	bool accepted = false;
	29	struct sockaddr_un addr;
	30	socklen_t addrlen = sizeof(addr);
	31
	32	g_assert(channel != NULL);
	33
	34	client_fd = qemu_accept(g_io_channel_unix_get_fd(channel),
	35	(struct sockaddr *)&addr, &addrlen);
	36	if (client_fd == -1) {
	37	g_warning("error converting fd to gsocket: %s", strerror(errno));
	38	goto out;
	39	}
16b38080	40	qemu_set_nonblock(client_fd);
125b310e MR	41	ret = ga_channel_client_add(c, client_fd);
	42	if (ret) {
	43	g_warning("error setting up connection");
32c16620	44	close(client_fd);
125b310e MR	45	goto out;
	46	}
	47	accepted = true;
	48
	49	out:
	50	/* only accept 1 connection at a time */
	51	return !accepted;
	52	}
	53
	54	/* start polling for readable events on listen fd, new==true
	55	* indicates we should use the existing s->listen_channel
	56	*/
	57	static void ga_channel_listen_add(GAChannel *c, int listen_fd, bool create)
	58	{
	59	if (create) {
	60	c->listen_channel = g_io_channel_unix_new(listen_fd);
	61	}
	62	g_io_add_watch(c->listen_channel, G_IO_IN, ga_channel_listen_accept, c);
	63	}
	64
	65	static void ga_channel_listen_close(GAChannel *c)
	66	{
	67	g_assert(c->method == GA_CHANNEL_UNIX_LISTEN);
	68	g_assert(c->listen_channel);
	69	g_io_channel_shutdown(c->listen_channel, true, NULL);
	70	g_io_channel_unref(c->listen_channel);
	71	c->listen_channel = NULL;
	72	}
	73
	74	/* cleanup state for closed connection/session, start accepting new
	75	* connections if we're in listening mode
	76	*/
	77	static void ga_channel_client_close(GAChannel *c)
	78	{
	79	g_assert(c->client_channel);
	80	g_io_channel_shutdown(c->client_channel, true, NULL);
	81	g_io_channel_unref(c->client_channel);
	82	c->client_channel = NULL;
	83	if (c->method == GA_CHANNEL_UNIX_LISTEN && c->listen_channel) {
	84	ga_channel_listen_add(c, 0, false);
	85	}
	86	}
	87
	88	static gboolean ga_channel_client_event(GIOChannel *channel,
	89	GIOCondition condition, gpointer data)
	90	{
	91	GAChannel *c = data;
	92	gboolean client_cont;
	93
	94	g_assert(c);
	95	if (c->event_cb) {
	96	client_cont = c->event_cb(condition, c->user_data);
	97	if (!client_cont) {
	98	ga_channel_client_close(c);
	99	return false;
	100	}
	101	}
	102	return true;
	103	}
	104
	105	static int ga_channel_client_add(GAChannel *c, int fd)
	106	{
	107	GIOChannel *client_channel;
	108	GError *err = NULL;
109
110	g_assert(c && !c->client_channel);
111	client_channel = g_io_channel_unix_new(fd);
112	g_assert(client_channel);
113	g_io_channel_set_encoding(client_channel, NULL, &err);
114	if (err != NULL) {
115	g_warning("error setting channel encoding to binary");
116	g_error_free(err);
117	return -1;
118	}
119	g_io_add_watch(client_channel, G_IO_IN \| G_IO_HUP,
120	ga_channel_client_event, c);
121	c->client_channel = client_channel;
122	return 0;
123	}
124
125	static gboolean ga_channel_open(GAChannel c, const gchar path, GAChannelMethod method)
126	{
127	int ret;
128	c->method = method;
129
130	switch (c->method) {
131	case GA_CHANNEL_VIRTIO_SERIAL: {
e61ab1da AF	132	int fd = qemu_open(path, O_RDWR \| O_NONBLOCK
	133	#ifndef CONFIG_SOLARIS
	134	\| O_ASYNC
	135	#endif
	136	);
125b310e MR	137	if (fd == -1) {
125b310e MR	138	g_critical("error opening channel: %s", strerror(errno));
7868181f	139	return false;
125b310e	140	}
e61ab1da AF	141	#ifdef CONFIG_SOLARIS
	142	ret = ioctl(fd, I_SETSIG, S_OUTPUT \| S_INPUT \| S_HIPRI);
	143	if (ret == -1) {
	144	g_critical("error setting event mask for channel: %s",
	145	strerror(errno));
7868181f MA	146	close(fd);
7868181f MA	147	return false;
e61ab1da AF	148	}
e61ab1da AF	149	#endif
125b310e MR	150	ret = ga_channel_client_add(c, fd);
	151	if (ret) {
	152	g_critical("error adding channel to main loop");
d4f4a3ef	153	close(fd);
125b310e MR	154	return false;
	155	}
	156	break;
	157	}
	158	case GA_CHANNEL_ISA_SERIAL: {
	159	struct termios tio;
	160	int fd = qemu_open(path, O_RDWR \| O_NOCTTY \| O_NONBLOCK);
	161	if (fd == -1) {
	162	g_critical("error opening channel: %s", strerror(errno));
7868181f	163	return false;
125b310e MR	164	}
	165	tcgetattr(fd, &tio);
	166	/* set up serial port for non-canonical, dumb byte streaming */
	167	tio.c_iflag &= ~(IGNBRK \| BRKINT \| IGNPAR \| PARMRK \| INPCK \| ISTRIP \|
	168	INLCR \| IGNCR \| ICRNL \| IXON \| IXOFF \| IXANY \|
	169	IMAXBEL);
	170	tio.c_oflag = 0;
	171	tio.c_lflag = 0;
	172	tio.c_cflag \|= GA_CHANNEL_BAUDRATE_DEFAULT;
	173	/* 1 available byte min or reads will block (we'll set non-blocking
	174	* elsewhere, else we have to deal with read()=0 instead)
	175	*/
	176	tio.c_cc[VMIN] = 1;
	177	tio.c_cc[VTIME] = 0;
	178	/* flush everything waiting for read/xmit, it's garbage at this point */
	179	tcflush(fd, TCIFLUSH);
	180	tcsetattr(fd, TCSANOW, &tio);
	181	ret = ga_channel_client_add(c, fd);
	182	if (ret) {
7868181f MA	183	g_critical("error adding channel to main loop");
	184	close(fd);
	185	return false;
125b310e MR	186	}
	187	break;
	188	}
	189	case GA_CHANNEL_UNIX_LISTEN: {
90119816 PB	190	Error *local_err = NULL;
	191	int fd = unix_listen(path, NULL, strlen(path), &local_err);
	192	if (local_err != NULL) {
	193	g_critical("%s", error_get_pretty(local_err));
	194	error_free(local_err);
125b310e MR	195	return false;
	196	}
	197	ga_channel_listen_add(c, fd, true);
	198	break;
	199	}
	200	default:
	201	g_critical("error binding/listening to specified socket");
	202	return false;
	203	}
	204
	205	return true;
	206	}
	207
	208	GIOStatus ga_channel_write_all(GAChannel c, const gchar buf, gsize size)
	209	{
	210	GError *err = NULL;
	211	gsize written = 0;
	212	GIOStatus status = G_IO_STATUS_NORMAL;
	213
	214	while (size) {
f74df9bf	215	g_debug("sending data, count: %d", (int)size);
125b310e MR	216	status = g_io_channel_write_chars(c->client_channel, buf, size,
125b310e MR	217	&written, &err);
f74df9bf YP	218	if (status == G_IO_STATUS_NORMAL) {
	219	size -= written;
	220	buf += written;
	221	} else if (status != G_IO_STATUS_AGAIN) {
125b310e	222	g_warning("error writing to channel: %s", err->message);
f74df9bf	223	return status;
125b310e	224	}
125b310e MR	225	}
125b310e MR	226
f74df9bf	227	do {
125b310e	228	status = g_io_channel_flush(c->client_channel, &err);
f74df9bf YP	229	} while (status == G_IO_STATUS_AGAIN);
	230
	231	if (status != G_IO_STATUS_NORMAL) {
	232	g_warning("error flushing channel: %s", err->message);
125b310e MR	233	}
	234
	235	return status;
	236	}
	237
	238	GIOStatus ga_channel_read(GAChannel c, gchar buf, gsize size, gsize *count)
	239	{
	240	return g_io_channel_read_chars(c->client_channel, buf, size, count, NULL);
	241	}
	242
	243	GAChannel ga_channel_new(GAChannelMethod method, const gchar path,
	244	GAChannelCallback cb, gpointer opaque)
	245	{
f3a06403	246	GAChannel *c = g_new0(GAChannel, 1);
125b310e MR	247	c->event_cb = cb;
	248	c->user_data = opaque;
	249
	250	if (!ga_channel_open(c, path, method)) {
	251	g_critical("error opening channel");
	252	ga_channel_free(c);
	253	return NULL;
	254	}
	255
	256	return c;
	257	}
	258
	259	void ga_channel_free(GAChannel *c)
	260	{
	261	if (c->method == GA_CHANNEL_UNIX_LISTEN
	262	&& c->listen_channel) {
	263	ga_channel_listen_close(c);
	264	}
	265	if (c->client_channel) {
	266	ga_channel_client_close(c);
	267	}
	268	g_free(c);
	269	}