qemu/qga/channel-posix.c

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#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include <termios.h>
2016-03-14 11:01:28 +03:00
#include "qapi/error.h"
#include "qemu/sockets.h"
#include "channel.h"
#include "cutils.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;
g_assert(channel != NULL);
client_fd = qemu_accept(g_io_channel_unix_get_fd(channel), NULL, NULL);
if (client_fd == -1) {
g_warning("error converting fd to gsocket: %s", strerror(errno));
goto out;
}
qemu_socket_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->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->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 fd, Error **errp)
{
int ret;
c->method = method;
switch (c->method) {
case GA_CHANNEL_VIRTIO_SERIAL: {
assert(fd < 0);
fd = qga_open_cloexec(
path,
#ifndef CONFIG_SOLARIS
O_ASYNC |
#endif
O_RDWR | O_NONBLOCK,
0
);
if (fd == -1) {
error_setg_errno(errp, errno, "error opening channel '%s'", path);
return false;
}
#ifdef CONFIG_SOLARIS
ret = ioctl(fd, I_SETSIG, S_OUTPUT | S_INPUT | S_HIPRI);
if (ret == -1) {
error_setg_errno(errp, errno, "error setting event mask for channel");
close(fd);
return false;
}
#endif
#ifdef __FreeBSD__
/*
* In the default state channel sends echo of every command to a
* client. The client program doesn't expect this and raises an
* error. Suppress echo by resetting ECHO terminal flag.
*/
struct termios tio;
if (tcgetattr(fd, &tio) < 0) {
error_setg_errno(errp, errno, "error getting channel termios attrs");
close(fd);
return false;
}
tio.c_lflag &= ~ECHO;
if (tcsetattr(fd, TCSAFLUSH, &tio) < 0) {
error_setg_errno(errp, errno, "error setting channel termios attrs");
close(fd);
return false;
}
#endif /* __FreeBSD__ */
ret = ga_channel_client_add(c, fd);
if (ret) {
error_setg(errp, "error adding channel to main loop");
close(fd);
return false;
}
break;
}
case GA_CHANNEL_ISA_SERIAL: {
struct termios tio;
assert(fd < 0);
fd = qga_open_cloexec(path, O_RDWR | O_NOCTTY | O_NONBLOCK, 0);
if (fd == -1) {
error_setg_errno(errp, errno, "error opening channel '%s'", path);
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) {
error_setg(errp, "error adding channel to main loop");
close(fd);
return false;
}
break;
}
case GA_CHANNEL_UNIX_LISTEN: {
if (fd < 0) {
fd = unix_listen(path, errp);
if (fd < 0) {
return false;
}
}
ga_channel_listen_add(c, fd, true);
break;
}
case GA_CHANNEL_VSOCK_LISTEN: {
if (fd < 0) {
SocketAddress *addr;
char *addr_str;
addr_str = g_strdup_printf("vsock:%s", path);
addr = socket_parse(addr_str, errp);
g_free(addr_str);
if (!addr) {
return false;
}
fd = socket_listen(addr, 1, errp);
qapi_free_SocketAddress(addr);
if (fd < 0) {
return false;
}
}
ga_channel_listen_add(c, fd, true);
break;
}
default:
error_setg(errp, "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,
int listen_fd, GAChannelCallback cb, gpointer opaque)
{
Error *err = NULL;
GAChannel *c = g_new0(GAChannel, 1);
c->event_cb = cb;
c->user_data = opaque;
if (!ga_channel_open(c, path, method, listen_fd, &err)) {
g_critical("%s", error_get_pretty(err));
error_free(err);
ga_channel_free(c);
return NULL;
}
return c;
}
void ga_channel_free(GAChannel *c)
{
if (c->listen_channel) {
ga_channel_listen_close(c);
}
if (c->client_channel) {
ga_channel_client_close(c);
}
g_free(c);
}