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

#include "qemu/osdep.h"
#include <glib.h>
#include <termios.h>
#include "qapi/error.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>
da34e65c	4	#include "qapi/error.h"
1de7afc9	5	#include "qemu/sockets.h"
125b310e MR	6	#include "qga/channel.h"
125b310e MR	7
e61ab1da AF	8	#ifdef CONFIG_SOLARIS
	9	#include <stropts.h>
	10	#endif
	11
125b310e MR	12	#define GA_CHANNEL_BAUDRATE_DEFAULT B38400 /* for isa-serial channels */
	13
	14	struct GAChannel {
	15	GIOChannel *listen_channel;
	16	GIOChannel *client_channel;
	17	GAChannelMethod method;
	18	GAChannelCallback event_cb;
	19	gpointer user_data;
	20	};
	21
	22	static int ga_channel_client_add(GAChannel *c, int fd);
	23
	24	static gboolean ga_channel_listen_accept(GIOChannel *channel,
	25	GIOCondition condition, gpointer data)
	26	{
	27	GAChannel *c = data;
	28	int ret, client_fd;
	29	bool accepted = false;
	30	struct sockaddr_un addr;
	31	socklen_t addrlen = sizeof(addr);
	32
	33	g_assert(channel != NULL);
	34
	35	client_fd = qemu_accept(g_io_channel_unix_get_fd(channel),
	36	(struct sockaddr *)&addr, &addrlen);
	37	if (client_fd == -1) {
	38	g_warning("error converting fd to gsocket: %s", strerror(errno));
	39	goto out;
	40	}
16b38080	41	qemu_set_nonblock(client_fd);
125b310e MR	42	ret = ga_channel_client_add(c, client_fd);
	43	if (ret) {
	44	g_warning("error setting up connection");
32c16620	45	close(client_fd);
125b310e MR	46	goto out;
	47	}
	48	accepted = true;
	49
	50	out:
	51	/* only accept 1 connection at a time */
	52	return !accepted;
	53	}
	54
	55	/* start polling for readable events on listen fd, new==true
	56	* indicates we should use the existing s->listen_channel
	57	*/
	58	static void ga_channel_listen_add(GAChannel *c, int listen_fd, bool create)
	59	{
	60	if (create) {
	61	c->listen_channel = g_io_channel_unix_new(listen_fd);
	62	}
	63	g_io_add_watch(c->listen_channel, G_IO_IN, ga_channel_listen_accept, c);
	64	}
	65
	66	static void ga_channel_listen_close(GAChannel *c)
	67	{
	68	g_assert(c->method == GA_CHANNEL_UNIX_LISTEN);
	69	g_assert(c->listen_channel);
	70	g_io_channel_shutdown(c->listen_channel, true, NULL);
	71	g_io_channel_unref(c->listen_channel);
	72	c->listen_channel = NULL;
	73	}
	74
	75	/* cleanup state for closed connection/session, start accepting new
	76	* connections if we're in listening mode
	77	*/
	78	static void ga_channel_client_close(GAChannel *c)
	79	{
	80	g_assert(c->client_channel);
	81	g_io_channel_shutdown(c->client_channel, true, NULL);
	82	g_io_channel_unref(c->client_channel);
	83	c->client_channel = NULL;
	84	if (c->method == GA_CHANNEL_UNIX_LISTEN && c->listen_channel) {
	85	ga_channel_listen_add(c, 0, false);
	86	}
	87	}
	88
	89	static gboolean ga_channel_client_event(GIOChannel *channel,
	90	GIOCondition condition, gpointer data)
	91	{
	92	GAChannel *c = data;
	93	gboolean client_cont;
	94
	95	g_assert(c);
	96	if (c->event_cb) {
	97	client_cont = c->event_cb(condition, c->user_data);
	98	if (!client_cont) {
	99	ga_channel_client_close(c);
	100	return false;
	101	}
	102	}
	103	return true;
	104	}
	105
	106	static int ga_channel_client_add(GAChannel *c, int fd)
	107	{
	108	GIOChannel *client_channel;
	109	GError *err = NULL;
110
111	g_assert(c && !c->client_channel);
112	client_channel = g_io_channel_unix_new(fd);
113	g_assert(client_channel);
114	g_io_channel_set_encoding(client_channel, NULL, &err);
115	if (err != NULL) {
116	g_warning("error setting channel encoding to binary");
117	g_error_free(err);
118	return -1;
119	}
120	g_io_add_watch(client_channel, G_IO_IN \| G_IO_HUP,
121	ga_channel_client_event, c);
122	c->client_channel = client_channel;
123	return 0;
124	}
125
126	static gboolean ga_channel_open(GAChannel c, const gchar path, GAChannelMethod method)
127	{
128	int ret;
129	c->method = method;
130
131	switch (c->method) {
132	case GA_CHANNEL_VIRTIO_SERIAL: {
e61ab1da AF	133	int fd = qemu_open(path, O_RDWR \| O_NONBLOCK
	134	#ifndef CONFIG_SOLARIS
	135	\| O_ASYNC
	136	#endif
	137	);
125b310e MR	138	if (fd == -1) {
125b310e MR	139	g_critical("error opening channel: %s", strerror(errno));
7868181f	140	return false;
125b310e	141	}
e61ab1da AF	142	#ifdef CONFIG_SOLARIS
	143	ret = ioctl(fd, I_SETSIG, S_OUTPUT \| S_INPUT \| S_HIPRI);
	144	if (ret == -1) {
	145	g_critical("error setting event mask for channel: %s",
	146	strerror(errno));
7868181f MA	147	close(fd);
7868181f MA	148	return false;
e61ab1da AF	149	}
e61ab1da AF	150	#endif
125b310e MR	151	ret = ga_channel_client_add(c, fd);
	152	if (ret) {
	153	g_critical("error adding channel to main loop");
d4f4a3ef	154	close(fd);
125b310e MR	155	return false;
	156	}
	157	break;
	158	}
	159	case GA_CHANNEL_ISA_SERIAL: {
	160	struct termios tio;
	161	int fd = qemu_open(path, O_RDWR \| O_NOCTTY \| O_NONBLOCK);
	162	if (fd == -1) {
	163	g_critical("error opening channel: %s", strerror(errno));
7868181f	164	return false;
125b310e MR	165	}
	166	tcgetattr(fd, &tio);
	167	/* set up serial port for non-canonical, dumb byte streaming */
	168	tio.c_iflag &= ~(IGNBRK \| BRKINT \| IGNPAR \| PARMRK \| INPCK \| ISTRIP \|
	169	INLCR \| IGNCR \| ICRNL \| IXON \| IXOFF \| IXANY \|
	170	IMAXBEL);
	171	tio.c_oflag = 0;
	172	tio.c_lflag = 0;
	173	tio.c_cflag \|= GA_CHANNEL_BAUDRATE_DEFAULT;
	174	/* 1 available byte min or reads will block (we'll set non-blocking
	175	* elsewhere, else we have to deal with read()=0 instead)
	176	*/
	177	tio.c_cc[VMIN] = 1;
	178	tio.c_cc[VTIME] = 0;
	179	/* flush everything waiting for read/xmit, it's garbage at this point */
	180	tcflush(fd, TCIFLUSH);
	181	tcsetattr(fd, TCSANOW, &tio);
	182	ret = ga_channel_client_add(c, fd);
	183	if (ret) {
7868181f MA	184	g_critical("error adding channel to main loop");
	185	close(fd);
	186	return false;
125b310e MR	187	}
	188	break;
	189	}
	190	case GA_CHANNEL_UNIX_LISTEN: {
90119816 PB	191	Error *local_err = NULL;
	192	int fd = unix_listen(path, NULL, strlen(path), &local_err);
	193	if (local_err != NULL) {
	194	g_critical("%s", error_get_pretty(local_err));
	195	error_free(local_err);
125b310e MR	196	return false;
	197	}
	198	ga_channel_listen_add(c, fd, true);
	199	break;
	200	}
	201	default:
	202	g_critical("error binding/listening to specified socket");
	203	return false;
	204	}
	205
	206	return true;
	207	}
	208
	209	GIOStatus ga_channel_write_all(GAChannel c, const gchar buf, gsize size)
	210	{
	211	GError *err = NULL;
	212	gsize written = 0;
	213	GIOStatus status = G_IO_STATUS_NORMAL;
	214
	215	while (size) {
f74df9bf	216	g_debug("sending data, count: %d", (int)size);
125b310e MR	217	status = g_io_channel_write_chars(c->client_channel, buf, size,
125b310e MR	218	&written, &err);
f74df9bf YP	219	if (status == G_IO_STATUS_NORMAL) {
	220	size -= written;
	221	buf += written;
	222	} else if (status != G_IO_STATUS_AGAIN) {
125b310e	223	g_warning("error writing to channel: %s", err->message);
f74df9bf	224	return status;
125b310e	225	}
125b310e MR	226	}
125b310e MR	227
f74df9bf	228	do {
125b310e	229	status = g_io_channel_flush(c->client_channel, &err);
f74df9bf YP	230	} while (status == G_IO_STATUS_AGAIN);
	231
	232	if (status != G_IO_STATUS_NORMAL) {
	233	g_warning("error flushing channel: %s", err->message);
125b310e MR	234	}
	235
	236	return status;
	237	}
	238
	239	GIOStatus ga_channel_read(GAChannel c, gchar buf, gsize size, gsize *count)
	240	{
	241	return g_io_channel_read_chars(c->client_channel, buf, size, count, NULL);
	242	}
	243
	244	GAChannel ga_channel_new(GAChannelMethod method, const gchar path,
	245	GAChannelCallback cb, gpointer opaque)
	246	{
f3a06403	247	GAChannel *c = g_new0(GAChannel, 1);
125b310e MR	248	c->event_cb = cb;
	249	c->user_data = opaque;
	250
	251	if (!ga_channel_open(c, path, method)) {
	252	g_critical("error opening channel");
	253	ga_channel_free(c);
	254	return NULL;
	255	}
	256
	257	return c;
	258	}
	259
	260	void ga_channel_free(GAChannel *c)
	261	{
	262	if (c->method == GA_CHANNEL_UNIX_LISTEN
	263	&& c->listen_channel) {
	264	ga_channel_listen_close(c);
	265	}
	266	if (c->client_channel) {
	267	ga_channel_client_close(c);
	268	}
	269	g_free(c);
	270	}