qemu/qga/channel-posix.c
Markus Armbruster bd269ebc82 sockets: Limit SocketAddressLegacy to external interfaces
SocketAddressLegacy is a simple union, and simple unions are awkward:
they have their variant members wrapped in a "data" object on the
wire, and require additional indirections in C.  SocketAddress is the
equivalent flat union.  Convert all users of SocketAddressLegacy to
SocketAddress, except for existing external interfaces.

See also commit fce5d53..9445673 and 85a82e8..c5f1ae3.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1493192202-3184-7-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[Minor editing accident fixed, commit message and a comment tweaked]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
2017-05-09 09:14:40 +02:00

298 lines
8.3 KiB
C

#include "qemu/osdep.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;
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_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)
{
int ret;
c->method = method;
switch (c->method) {
case GA_CHANNEL_VIRTIO_SERIAL: {
assert(fd < 0);
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;
assert(fd < 0);
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: {
if (fd < 0) {
Error *local_err = NULL;
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;
}
case GA_CHANNEL_VSOCK_LISTEN: {
if (fd < 0) {
Error *local_err = NULL;
SocketAddress *addr;
char *addr_str;
addr_str = g_strdup_printf("vsock:%s", path);
addr = socket_parse(addr_str, &local_err);
g_free(addr_str);
if (local_err != NULL) {
g_critical("%s", error_get_pretty(local_err));
error_free(local_err);
return false;
}
fd = socket_listen(addr, &local_err);
qapi_free_SocketAddress(addr);
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,
int listen_fd, 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, listen_fd)) {
g_critical("error opening channel");
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);
}