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#include <glib.h>
#include <termios.h>
#include "qemu_socket.h"
#include "qga/channel.h"
#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;
}
fcntl(client_fd, F_SETFL, O_NONBLOCK);
ret = ga_channel_client_add(c, client_fd);
if (ret) {
g_warning("error setting up connection");
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 | O_ASYNC);
if (fd == -1) {
g_critical("error opening channel: %s", strerror(errno));
exit(EXIT_FAILURE);
}
ret = ga_channel_client_add(c, fd);
if (ret) {
g_critical("error adding channel to main loop");
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));
exit(EXIT_FAILURE);
}
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_error("error adding channel to main loop");
}
break;
}
case GA_CHANNEL_UNIX_LISTEN: {
int fd = unix_listen(path, NULL, strlen(path));
if (fd == -1) {
g_critical("error opening path: %s", strerror(errno));
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) {
status = g_io_channel_write_chars(c->client_channel, buf, size,
&written, &err);
g_debug("sending data, count: %d", (int)size);
if (err != NULL) {
g_warning("error writing to channel: %s", err->message);
return G_IO_STATUS_ERROR;
}
if (status != G_IO_STATUS_NORMAL) {
break;
}
size -= written;
}
if (status == G_IO_STATUS_NORMAL) {
status = g_io_channel_flush(c->client_channel, &err);
if (err != NULL) {
g_warning("error flushing channel: %s", err->message);
return G_IO_STATUS_ERROR;
}
}
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_malloc0(sizeof(GAChannel));
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);
}
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