298 lines
8.3 KiB
C
298 lines
8.3 KiB
C
#include "qemu/osdep.h"
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#include <termios.h>
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#include "qapi/error.h"
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#include "qemu/sockets.h"
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#include "channel.h"
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#ifdef CONFIG_SOLARIS
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#include <stropts.h>
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#endif
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#define GA_CHANNEL_BAUDRATE_DEFAULT B38400 /* for isa-serial channels */
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struct GAChannel {
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GIOChannel *listen_channel;
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GIOChannel *client_channel;
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GAChannelMethod method;
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GAChannelCallback event_cb;
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gpointer user_data;
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};
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static int ga_channel_client_add(GAChannel *c, int fd);
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static gboolean ga_channel_listen_accept(GIOChannel *channel,
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GIOCondition condition, gpointer data)
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{
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GAChannel *c = data;
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int ret, client_fd;
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bool accepted = false;
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g_assert(channel != NULL);
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client_fd = qemu_accept(g_io_channel_unix_get_fd(channel), NULL, NULL);
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if (client_fd == -1) {
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g_warning("error converting fd to gsocket: %s", strerror(errno));
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goto out;
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}
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qemu_set_nonblock(client_fd);
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ret = ga_channel_client_add(c, client_fd);
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if (ret) {
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g_warning("error setting up connection");
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close(client_fd);
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goto out;
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}
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accepted = true;
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out:
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/* only accept 1 connection at a time */
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return !accepted;
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}
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/* start polling for readable events on listen fd, new==true
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* indicates we should use the existing s->listen_channel
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*/
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static void ga_channel_listen_add(GAChannel *c, int listen_fd, bool create)
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{
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if (create) {
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c->listen_channel = g_io_channel_unix_new(listen_fd);
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}
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g_io_add_watch(c->listen_channel, G_IO_IN, ga_channel_listen_accept, c);
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}
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static void ga_channel_listen_close(GAChannel *c)
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{
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g_assert(c->listen_channel);
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g_io_channel_shutdown(c->listen_channel, true, NULL);
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g_io_channel_unref(c->listen_channel);
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c->listen_channel = NULL;
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}
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/* cleanup state for closed connection/session, start accepting new
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* connections if we're in listening mode
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*/
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static void ga_channel_client_close(GAChannel *c)
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{
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g_assert(c->client_channel);
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g_io_channel_shutdown(c->client_channel, true, NULL);
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g_io_channel_unref(c->client_channel);
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c->client_channel = NULL;
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if (c->listen_channel) {
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ga_channel_listen_add(c, 0, false);
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}
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}
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static gboolean ga_channel_client_event(GIOChannel *channel,
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GIOCondition condition, gpointer data)
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{
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GAChannel *c = data;
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gboolean client_cont;
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g_assert(c);
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if (c->event_cb) {
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client_cont = c->event_cb(condition, c->user_data);
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if (!client_cont) {
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ga_channel_client_close(c);
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return false;
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}
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}
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return true;
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}
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static int ga_channel_client_add(GAChannel *c, int fd)
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{
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GIOChannel *client_channel;
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GError *err = NULL;
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g_assert(c && !c->client_channel);
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client_channel = g_io_channel_unix_new(fd);
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g_assert(client_channel);
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g_io_channel_set_encoding(client_channel, NULL, &err);
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if (err != NULL) {
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g_warning("error setting channel encoding to binary");
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g_error_free(err);
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return -1;
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}
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g_io_add_watch(client_channel, G_IO_IN | G_IO_HUP,
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ga_channel_client_event, c);
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c->client_channel = client_channel;
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return 0;
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}
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static gboolean ga_channel_open(GAChannel *c, const gchar *path,
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GAChannelMethod method, int fd)
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{
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int ret;
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c->method = method;
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switch (c->method) {
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case GA_CHANNEL_VIRTIO_SERIAL: {
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assert(fd < 0);
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fd = qemu_open(path, O_RDWR | O_NONBLOCK
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#ifndef CONFIG_SOLARIS
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| O_ASYNC
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#endif
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);
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if (fd == -1) {
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g_critical("error opening channel: %s", strerror(errno));
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return false;
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}
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#ifdef CONFIG_SOLARIS
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ret = ioctl(fd, I_SETSIG, S_OUTPUT | S_INPUT | S_HIPRI);
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if (ret == -1) {
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g_critical("error setting event mask for channel: %s",
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strerror(errno));
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close(fd);
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return false;
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}
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#endif
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ret = ga_channel_client_add(c, fd);
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if (ret) {
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g_critical("error adding channel to main loop");
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close(fd);
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return false;
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}
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break;
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}
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case GA_CHANNEL_ISA_SERIAL: {
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struct termios tio;
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assert(fd < 0);
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fd = qemu_open(path, O_RDWR | O_NOCTTY | O_NONBLOCK);
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if (fd == -1) {
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g_critical("error opening channel: %s", strerror(errno));
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return false;
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}
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tcgetattr(fd, &tio);
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/* set up serial port for non-canonical, dumb byte streaming */
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tio.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | ISTRIP |
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INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY |
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IMAXBEL);
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tio.c_oflag = 0;
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tio.c_lflag = 0;
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tio.c_cflag |= GA_CHANNEL_BAUDRATE_DEFAULT;
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/* 1 available byte min or reads will block (we'll set non-blocking
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* elsewhere, else we have to deal with read()=0 instead)
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*/
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tio.c_cc[VMIN] = 1;
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tio.c_cc[VTIME] = 0;
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/* flush everything waiting for read/xmit, it's garbage at this point */
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tcflush(fd, TCIFLUSH);
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tcsetattr(fd, TCSANOW, &tio);
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ret = ga_channel_client_add(c, fd);
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if (ret) {
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g_critical("error adding channel to main loop");
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close(fd);
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return false;
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}
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break;
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}
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case GA_CHANNEL_UNIX_LISTEN: {
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if (fd < 0) {
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Error *local_err = NULL;
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fd = unix_listen(path, &local_err);
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if (local_err != NULL) {
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g_critical("%s", error_get_pretty(local_err));
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error_free(local_err);
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return false;
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}
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}
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ga_channel_listen_add(c, fd, true);
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break;
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}
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case GA_CHANNEL_VSOCK_LISTEN: {
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if (fd < 0) {
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Error *local_err = NULL;
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SocketAddress *addr;
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char *addr_str;
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addr_str = g_strdup_printf("vsock:%s", path);
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addr = socket_parse(addr_str, &local_err);
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g_free(addr_str);
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if (local_err != NULL) {
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g_critical("%s", error_get_pretty(local_err));
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error_free(local_err);
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return false;
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}
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fd = socket_listen(addr, &local_err);
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qapi_free_SocketAddress(addr);
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if (local_err != NULL) {
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g_critical("%s", error_get_pretty(local_err));
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error_free(local_err);
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return false;
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}
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}
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ga_channel_listen_add(c, fd, true);
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break;
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}
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default:
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g_critical("error binding/listening to specified socket");
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return false;
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}
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return true;
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}
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GIOStatus ga_channel_write_all(GAChannel *c, const gchar *buf, gsize size)
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{
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GError *err = NULL;
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gsize written = 0;
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GIOStatus status = G_IO_STATUS_NORMAL;
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while (size) {
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g_debug("sending data, count: %d", (int)size);
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status = g_io_channel_write_chars(c->client_channel, buf, size,
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&written, &err);
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if (status == G_IO_STATUS_NORMAL) {
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size -= written;
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buf += written;
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} else if (status != G_IO_STATUS_AGAIN) {
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g_warning("error writing to channel: %s", err->message);
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return status;
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}
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}
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do {
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status = g_io_channel_flush(c->client_channel, &err);
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} while (status == G_IO_STATUS_AGAIN);
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if (status != G_IO_STATUS_NORMAL) {
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g_warning("error flushing channel: %s", err->message);
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}
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return status;
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}
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GIOStatus ga_channel_read(GAChannel *c, gchar *buf, gsize size, gsize *count)
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{
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return g_io_channel_read_chars(c->client_channel, buf, size, count, NULL);
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}
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GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path,
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int listen_fd, GAChannelCallback cb, gpointer opaque)
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{
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GAChannel *c = g_new0(GAChannel, 1);
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c->event_cb = cb;
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c->user_data = opaque;
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if (!ga_channel_open(c, path, method, listen_fd)) {
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g_critical("error opening channel");
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ga_channel_free(c);
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return NULL;
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}
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return c;
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}
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void ga_channel_free(GAChannel *c)
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{
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if (c->listen_channel) {
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ga_channel_listen_close(c);
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}
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if (c->client_channel) {
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ga_channel_client_close(c);
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}
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g_free(c);
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}
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