char: move socket chardev to its own file

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Eric Blake <eblake@redhat.com>

1 files changed, 1017 insertions, 0 deletions

diff --git a/chardev/char-socket.c b/chardev/char-socket.c
new file mode 100644
index 0000000000..4068dc5e52
--- /dev/null
+++ b/chardev/char-socket.c
@@ -0,0 +1,1017 @@
+/*
+ * QEMU System Emulator
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "qemu/osdep.h"
+#include "sysemu/char.h"
+#include "io/channel-socket.h"
+#include "io/channel-tls.h"
+#include "qemu/error-report.h"
+#include "qapi/error.h"
+#include "qapi/clone-visitor.h"
+
+#include "char-io.h"
+
+/***********************************************************/
+/* TCP Net console */
+
+#define TCP_MAX_FDS 16
+
+typedef struct {
+    Chardev parent;
+    QIOChannel *ioc; /* Client I/O channel */
+    QIOChannelSocket *sioc; /* Client master channel */
+    QIOChannelSocket *listen_ioc;
+    guint listen_tag;
+    QCryptoTLSCreds *tls_creds;
+    int connected;
+    int max_size;
+    int do_telnetopt;
+    int do_nodelay;
+    int is_unix;
+    int *read_msgfds;
+    size_t read_msgfds_num;
+    int *write_msgfds;
+    size_t write_msgfds_num;
+
+    SocketAddress *addr;
+    bool is_listen;
+    bool is_telnet;
+
+    guint reconnect_timer;
+    int64_t reconnect_time;
+    bool connect_err_reported;
+} SocketChardev;
+
+#define SOCKET_CHARDEV(obj)                                     \
+    OBJECT_CHECK(SocketChardev, (obj), TYPE_CHARDEV_SOCKET)
+
+static gboolean socket_reconnect_timeout(gpointer opaque);
+
+static void qemu_chr_socket_restart_timer(Chardev *chr)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    char *name;
+
+    assert(s->connected == 0);
+    s->reconnect_timer = g_timeout_add_seconds(s->reconnect_time,
+                                               socket_reconnect_timeout, chr);
+    name = g_strdup_printf("chardev-socket-reconnect-%s", chr->label);
+    g_source_set_name_by_id(s->reconnect_timer, name);
+    g_free(name);
+}
+
+static void check_report_connect_error(Chardev *chr,
+                                       Error *err)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+
+    if (!s->connect_err_reported) {
+        error_report("Unable to connect character device %s: %s",
+                     chr->label, error_get_pretty(err));
+        s->connect_err_reported = true;
+    }
+    qemu_chr_socket_restart_timer(chr);
+}
+
+static gboolean tcp_chr_accept(QIOChannel *chan,
+                               GIOCondition cond,
+                               void *opaque);
+
+/* Called with chr_write_lock held.  */
+static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+
+    if (s->connected) {
+        int ret =  io_channel_send_full(s->ioc, buf, len,
+                                        s->write_msgfds,
+                                        s->write_msgfds_num);
+
+        /* free the written msgfds, no matter what */
+        if (s->write_msgfds_num) {
+            g_free(s->write_msgfds);
+            s->write_msgfds = 0;
+            s->write_msgfds_num = 0;
+        }
+
+        return ret;
+    } else {
+        /* XXX: indicate an error ? */
+        return len;
+    }
+}
+
+static int tcp_chr_read_poll(void *opaque)
+{
+    Chardev *chr = CHARDEV(opaque);
+    SocketChardev *s = SOCKET_CHARDEV(opaque);
+    if (!s->connected) {
+        return 0;
+    }
+    s->max_size = qemu_chr_be_can_write(chr);
+    return s->max_size;
+}
+
+#define IAC 255
+#define IAC_BREAK 243
+static void tcp_chr_process_IAC_bytes(Chardev *chr,
+                                      SocketChardev *s,
+                                      uint8_t *buf, int *size)
+{
+    /* Handle any telnet client's basic IAC options to satisfy char by
+     * char mode with no echo.  All IAC options will be removed from
+     * the buf and the do_telnetopt variable will be used to track the
+     * state of the width of the IAC information.
+     *
+     * IAC commands come in sets of 3 bytes with the exception of the
+     * "IAC BREAK" command and the double IAC.
+     */
+
+    int i;
+    int j = 0;
+
+    for (i = 0; i < *size; i++) {
+        if (s->do_telnetopt > 1) {
+            if ((unsigned char)buf[i] == IAC && s->do_telnetopt == 2) {
+                /* Double IAC means send an IAC */
+                if (j != i) {
+                    buf[j] = buf[i];
+                }
+                j++;
+                s->do_telnetopt = 1;
+            } else {
+                if ((unsigned char)buf[i] == IAC_BREAK
+                    && s->do_telnetopt == 2) {
+                    /* Handle IAC break commands by sending a serial break */
+                    qemu_chr_be_event(chr, CHR_EVENT_BREAK);
+                    s->do_telnetopt++;
+                }
+                s->do_telnetopt++;
+            }
+            if (s->do_telnetopt >= 4) {
+                s->do_telnetopt = 1;
+            }
+        } else {
+            if ((unsigned char)buf[i] == IAC) {
+                s->do_telnetopt = 2;
+            } else {
+                if (j != i) {
+                    buf[j] = buf[i];
+                }
+                j++;
+            }
+        }
+    }
+    *size = j;
+}
+
+static int tcp_get_msgfds(Chardev *chr, int *fds, int num)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+
+    int to_copy = (s->read_msgfds_num < num) ? s->read_msgfds_num : num;
+
+    assert(num <= TCP_MAX_FDS);
+
+    if (to_copy) {
+        int i;
+
+        memcpy(fds, s->read_msgfds, to_copy * sizeof(int));
+
+        /* Close unused fds */
+        for (i = to_copy; i < s->read_msgfds_num; i++) {
+            close(s->read_msgfds[i]);
+        }
+
+        g_free(s->read_msgfds);
+        s->read_msgfds = 0;
+        s->read_msgfds_num = 0;
+    }
+
+    return to_copy;
+}
+
+static int tcp_set_msgfds(Chardev *chr, int *fds, int num)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+
+    /* clear old pending fd array */
+    g_free(s->write_msgfds);
+    s->write_msgfds = NULL;
+    s->write_msgfds_num = 0;
+
+    if (!s->connected ||
+        !qio_channel_has_feature(s->ioc,
+                                 QIO_CHANNEL_FEATURE_FD_PASS)) {
+        return -1;
+    }
+
+    if (num) {
+        s->write_msgfds = g_new(int, num);
+        memcpy(s->write_msgfds, fds, num * sizeof(int));
+    }
+
+    s->write_msgfds_num = num;
+
+    return 0;
+}
+
+static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    struct iovec iov = { .iov_base = buf, .iov_len = len };
+    int ret;
+    size_t i;
+    int *msgfds = NULL;
+    size_t msgfds_num = 0;
+
+    if (qio_channel_has_feature(s->ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
+        ret = qio_channel_readv_full(s->ioc, &iov, 1,
+                                     &msgfds, &msgfds_num,
+                                     NULL);
+    } else {
+        ret = qio_channel_readv_full(s->ioc, &iov, 1,
+                                     NULL, NULL,
+                                     NULL);
+    }
+
+    if (ret == QIO_CHANNEL_ERR_BLOCK) {
+        errno = EAGAIN;
+        ret = -1;
+    } else if (ret == -1) {
+        errno = EIO;
+    }
+
+    if (msgfds_num) {
+        /* close and clean read_msgfds */
+        for (i = 0; i < s->read_msgfds_num; i++) {
+            close(s->read_msgfds[i]);
+        }
+
+        if (s->read_msgfds_num) {
+            g_free(s->read_msgfds);
+        }
+
+        s->read_msgfds = msgfds;
+        s->read_msgfds_num = msgfds_num;
+    }
+
+    for (i = 0; i < s->read_msgfds_num; i++) {
+        int fd = s->read_msgfds[i];
+        if (fd < 0) {
+            continue;
+        }
+
+        /* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
+        qemu_set_block(fd);
+
+#ifndef MSG_CMSG_CLOEXEC
+        qemu_set_cloexec(fd);
+#endif
+    }
+
+    return ret;
+}
+
+static GSource *tcp_chr_add_watch(Chardev *chr, GIOCondition cond)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    return qio_channel_create_watch(s->ioc, cond);
+}
+
+static void tcp_chr_free_connection(Chardev *chr)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    int i;
+
+    if (!s->connected) {
+        return;
+    }
+
+    if (s->read_msgfds_num) {
+        for (i = 0; i < s->read_msgfds_num; i++) {
+            close(s->read_msgfds[i]);
+        }
+        g_free(s->read_msgfds);
+        s->read_msgfds = NULL;
+        s->read_msgfds_num = 0;
+    }
+
+    tcp_set_msgfds(chr, NULL, 0);
+    remove_fd_in_watch(chr);
+    object_unref(OBJECT(s->sioc));
+    s->sioc = NULL;
+    object_unref(OBJECT(s->ioc));
+    s->ioc = NULL;
+    g_free(chr->filename);
+    chr->filename = NULL;
+    s->connected = 0;
+}
+
+static char *SocketAddress_to_str(const char *prefix, SocketAddress *addr,
+                                  bool is_listen, bool is_telnet)
+{
+    switch (addr->type) {
+    case SOCKET_ADDRESS_KIND_INET:
+        return g_strdup_printf("%s%s:%s:%s%s", prefix,
+                               is_telnet ? "telnet" : "tcp",
+                               addr->u.inet.data->host,
+                               addr->u.inet.data->port,
+                               is_listen ? ",server" : "");
+        break;
+    case SOCKET_ADDRESS_KIND_UNIX:
+        return g_strdup_printf("%sunix:%s%s", prefix,
+                               addr->u.q_unix.data->path,
+                               is_listen ? ",server" : "");
+        break;
+    case SOCKET_ADDRESS_KIND_FD:
+        return g_strdup_printf("%sfd:%s%s", prefix, addr->u.fd.data->str,
+                               is_listen ? ",server" : "");
+        break;
+    default:
+        abort();
+    }
+}
+
+static void tcp_chr_disconnect(Chardev *chr)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+
+    if (!s->connected) {
+        return;
+    }
+
+    tcp_chr_free_connection(chr);
+
+    if (s->listen_ioc) {
+        s->listen_tag = qio_channel_add_watch(
+            QIO_CHANNEL(s->listen_ioc), G_IO_IN, tcp_chr_accept, chr, NULL);
+    }
+    chr->filename = SocketAddress_to_str("disconnected:", s->addr,
+                                         s->is_listen, s->is_telnet);
+    qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
+    if (s->reconnect_time) {
+        qemu_chr_socket_restart_timer(chr);
+    }
+}
+
+static gboolean tcp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
+{
+    Chardev *chr = CHARDEV(opaque);
+    SocketChardev *s = SOCKET_CHARDEV(opaque);
+    uint8_t buf[CHR_READ_BUF_LEN];
+    int len, size;
+
+    if (!s->connected || s->max_size <= 0) {
+        return TRUE;
+    }
+    len = sizeof(buf);
+    if (len > s->max_size) {
+        len = s->max_size;
+    }
+    size = tcp_chr_recv(chr, (void *)buf, len);
+    if (size == 0 || size == -1) {
+        /* connection closed */
+        tcp_chr_disconnect(chr);
+    } else if (size > 0) {
+        if (s->do_telnetopt) {
+            tcp_chr_process_IAC_bytes(chr, s, buf, &size);
+        }
+        if (size > 0) {
+            qemu_chr_be_write(chr, buf, size);
+        }
+    }
+
+    return TRUE;
+}
+
+static int tcp_chr_sync_read(Chardev *chr, const uint8_t *buf, int len)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    int size;
+
+    if (!s->connected) {
+        return 0;
+    }
+
+    size = tcp_chr_recv(chr, (void *) buf, len);
+    if (size == 0) {
+        /* connection closed */
+        tcp_chr_disconnect(chr);
+    }
+
+    return size;
+}
+
+static char *sockaddr_to_str(struct sockaddr_storage *ss, socklen_t ss_len,
+                             struct sockaddr_storage *ps, socklen_t ps_len,
+                             bool is_listen, bool is_telnet)
+{
+    char shost[NI_MAXHOST], sserv[NI_MAXSERV];
+    char phost[NI_MAXHOST], pserv[NI_MAXSERV];
+    const char *left = "", *right = "";
+
+    switch (ss->ss_family) {
+#ifndef _WIN32
+    case AF_UNIX:
+        return g_strdup_printf("unix:%s%s",
+                               ((struct sockaddr_un *)(ss))->sun_path,
+                               is_listen ? ",server" : "");
+#endif
+    case AF_INET6:
+        left  = "[";
+        right = "]";
+        /* fall through */
+    case AF_INET:
+        getnameinfo((struct sockaddr *) ss, ss_len, shost, sizeof(shost),
+                    sserv, sizeof(sserv), NI_NUMERICHOST | NI_NUMERICSERV);
+        getnameinfo((struct sockaddr *) ps, ps_len, phost, sizeof(phost),
+                    pserv, sizeof(pserv), NI_NUMERICHOST | NI_NUMERICSERV);
+        return g_strdup_printf("%s:%s%s%s:%s%s <-> %s%s%s:%s",
+                               is_telnet ? "telnet" : "tcp",
+                               left, shost, right, sserv,
+                               is_listen ? ",server" : "",
+                               left, phost, right, pserv);
+
+    default:
+        return g_strdup_printf("unknown");
+    }
+}
+
+static void tcp_chr_connect(void *opaque)
+{
+    Chardev *chr = CHARDEV(opaque);
+    SocketChardev *s = SOCKET_CHARDEV(opaque);
+
+    g_free(chr->filename);
+    chr->filename = sockaddr_to_str(
+        &s->sioc->localAddr, s->sioc->localAddrLen,
+        &s->sioc->remoteAddr, s->sioc->remoteAddrLen,
+        s->is_listen, s->is_telnet);
+
+    s->connected = 1;
+    if (s->ioc) {
+        chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
+                                           tcp_chr_read_poll,
+                                           tcp_chr_read,
+                                           chr, NULL);
+    }
+    qemu_chr_be_generic_open(chr);
+}
+
+static void tcp_chr_update_read_handler(Chardev *chr,
+                                        GMainContext *context)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+
+    if (!s->connected) {
+        return;
+    }
+
+    remove_fd_in_watch(chr);
+    if (s->ioc) {
+        chr->fd_in_tag = io_add_watch_poll(chr, s->ioc,
+                                           tcp_chr_read_poll,
+                                           tcp_chr_read, chr,
+                                           context);
+    }
+}
+
+typedef struct {
+    Chardev *chr;
+    char buf[12];
+    size_t buflen;
+} TCPChardevTelnetInit;
+
+static gboolean tcp_chr_telnet_init_io(QIOChannel *ioc,
+                                       GIOCondition cond G_GNUC_UNUSED,
+                                       gpointer user_data)
+{
+    TCPChardevTelnetInit *init = user_data;
+    ssize_t ret;
+
+    ret = qio_channel_write(ioc, init->buf, init->buflen, NULL);
+    if (ret < 0) {
+        if (ret == QIO_CHANNEL_ERR_BLOCK) {
+            ret = 0;
+        } else {
+            tcp_chr_disconnect(init->chr);
+            return FALSE;
+        }
+    }
+    init->buflen -= ret;
+
+    if (init->buflen == 0) {
+        tcp_chr_connect(init->chr);
+        return FALSE;
+    }
+
+    memmove(init->buf, init->buf + ret, init->buflen);
+
+    return TRUE;
+}
+
+static void tcp_chr_telnet_init(Chardev *chr)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    TCPChardevTelnetInit *init = g_new0(TCPChardevTelnetInit, 1);
+    size_t n = 0;
+
+    init->chr = chr;
+    init->buflen = 12;
+
+#define IACSET(x, a, b, c)                      \
+    do {                                        \
+        x[n++] = a;                             \
+        x[n++] = b;                             \
+        x[n++] = c;                             \
+    } while (0)
+
+    /* Prep the telnet negotion to put telnet in binary,
+     * no echo, single char mode */
+    IACSET(init->buf, 0xff, 0xfb, 0x01);  /* IAC WILL ECHO */
+    IACSET(init->buf, 0xff, 0xfb, 0x03);  /* IAC WILL Suppress go ahead */
+    IACSET(init->buf, 0xff, 0xfb, 0x00);  /* IAC WILL Binary */
+    IACSET(init->buf, 0xff, 0xfd, 0x00);  /* IAC DO Binary */
+
+#undef IACSET
+
+    qio_channel_add_watch(
+        s->ioc, G_IO_OUT,
+        tcp_chr_telnet_init_io,
+        init, NULL);
+}
+
+
+static void tcp_chr_tls_handshake(QIOTask *task,
+                                  gpointer user_data)
+{
+    Chardev *chr = user_data;
+    SocketChardev *s = user_data;
+
+    if (qio_task_propagate_error(task, NULL)) {
+        tcp_chr_disconnect(chr);
+    } else {
+        if (s->do_telnetopt) {
+            tcp_chr_telnet_init(chr);
+        } else {
+            tcp_chr_connect(chr);
+        }
+    }
+}
+
+
+static void tcp_chr_tls_init(Chardev *chr)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    QIOChannelTLS *tioc;
+    Error *err = NULL;
+    gchar *name;
+
+    if (s->is_listen) {
+        tioc = qio_channel_tls_new_server(
+            s->ioc, s->tls_creds,
+            NULL, /* XXX Use an ACL */
+            &err);
+    } else {
+        tioc = qio_channel_tls_new_client(
+            s->ioc, s->tls_creds,
+            s->addr->u.inet.data->host,
+            &err);
+    }
+    if (tioc == NULL) {
+        error_free(err);
+        tcp_chr_disconnect(chr);
+        return;
+    }
+    name = g_strdup_printf("chardev-tls-%s-%s",
+                           s->is_listen ? "server" : "client",
+                           chr->label);
+    qio_channel_set_name(QIO_CHANNEL(tioc), name);
+    g_free(name);
+    object_unref(OBJECT(s->ioc));
+    s->ioc = QIO_CHANNEL(tioc);
+
+    qio_channel_tls_handshake(tioc,
+                              tcp_chr_tls_handshake,
+                              chr,
+                              NULL);
+}
+
+
+static void tcp_chr_set_client_ioc_name(Chardev *chr,
+                                        QIOChannelSocket *sioc)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    char *name;
+    name = g_strdup_printf("chardev-tcp-%s-%s",
+                           s->is_listen ? "server" : "client",
+                           chr->label);
+    qio_channel_set_name(QIO_CHANNEL(sioc), name);
+    g_free(name);
+
+}
+
+static int tcp_chr_new_client(Chardev *chr, QIOChannelSocket *sioc)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+
+    if (s->ioc != NULL) {
+        return -1;
+    }
+
+    s->ioc = QIO_CHANNEL(sioc);
+    object_ref(OBJECT(sioc));
+    s->sioc = sioc;
+    object_ref(OBJECT(sioc));
+
+    qio_channel_set_blocking(s->ioc, false, NULL);
+
+    if (s->do_nodelay) {
+        qio_channel_set_delay(s->ioc, false);
+    }
+    if (s->listen_tag) {
+        g_source_remove(s->listen_tag);
+        s->listen_tag = 0;
+    }
+
+    if (s->tls_creds) {
+        tcp_chr_tls_init(chr);
+    } else {
+        if (s->do_telnetopt) {
+            tcp_chr_telnet_init(chr);
+        } else {
+            tcp_chr_connect(chr);
+        }
+    }
+
+    return 0;
+}
+
+
+static int tcp_chr_add_client(Chardev *chr, int fd)
+{
+    int ret;
+    QIOChannelSocket *sioc;
+
+    sioc = qio_channel_socket_new_fd(fd, NULL);
+    if (!sioc) {
+        return -1;
+    }
+    tcp_chr_set_client_ioc_name(chr, sioc);
+    ret = tcp_chr_new_client(chr, sioc);
+    object_unref(OBJECT(sioc));
+    return ret;
+}
+
+static gboolean tcp_chr_accept(QIOChannel *channel,
+                               GIOCondition cond,
+                               void *opaque)
+{
+    Chardev *chr = CHARDEV(opaque);
+    QIOChannelSocket *sioc;
+
+    sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(channel),
+                                     NULL);
+    if (!sioc) {
+        return TRUE;
+    }
+
+    tcp_chr_new_client(chr, sioc);
+
+    object_unref(OBJECT(sioc));
+
+    return TRUE;
+}
+
+static int tcp_chr_wait_connected(Chardev *chr, Error **errp)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    QIOChannelSocket *sioc;
+
+    /* It can't wait on s->connected, since it is set asynchronously
+     * in TLS and telnet cases, only wait for an accepted socket */
+    while (!s->ioc) {
+        if (s->is_listen) {
+            error_report("QEMU waiting for connection on: %s",
+                         chr->filename);
+            qio_channel_set_blocking(QIO_CHANNEL(s->listen_ioc), true, NULL);
+            tcp_chr_accept(QIO_CHANNEL(s->listen_ioc), G_IO_IN, chr);
+            qio_channel_set_blocking(QIO_CHANNEL(s->listen_ioc), false, NULL);
+        } else {
+            sioc = qio_channel_socket_new();
+            tcp_chr_set_client_ioc_name(chr, sioc);
+            if (qio_channel_socket_connect_sync(sioc, s->addr, errp) < 0) {
+                object_unref(OBJECT(sioc));
+                return -1;
+            }
+            tcp_chr_new_client(chr, sioc);
+            object_unref(OBJECT(sioc));
+        }
+    }
+
+    return 0;
+}
+
+static void char_socket_finalize(Object *obj)
+{
+    Chardev *chr = CHARDEV(obj);
+    SocketChardev *s = SOCKET_CHARDEV(obj);
+
+    tcp_chr_free_connection(chr);
+
+    if (s->reconnect_timer) {
+        g_source_remove(s->reconnect_timer);
+        s->reconnect_timer = 0;
+    }
+    qapi_free_SocketAddress(s->addr);
+    if (s->listen_tag) {
+        g_source_remove(s->listen_tag);
+        s->listen_tag = 0;
+    }
+    if (s->listen_ioc) {
+        object_unref(OBJECT(s->listen_ioc));
+    }
+    if (s->tls_creds) {
+        object_unref(OBJECT(s->tls_creds));
+    }
+
+    qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
+}
+
+static void qemu_chr_socket_connected(QIOTask *task, void *opaque)
+{
+    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(qio_task_get_source(task));
+    Chardev *chr = CHARDEV(opaque);
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    Error *err = NULL;
+
+    if (qio_task_propagate_error(task, &err)) {
+        check_report_connect_error(chr, err);
+        error_free(err);
+        goto cleanup;
+    }
+
+    s->connect_err_reported = false;
+    tcp_chr_new_client(chr, sioc);
+
+cleanup:
+    object_unref(OBJECT(sioc));
+}
+
+static gboolean socket_reconnect_timeout(gpointer opaque)
+{
+    Chardev *chr = CHARDEV(opaque);
+    SocketChardev *s = SOCKET_CHARDEV(opaque);
+    QIOChannelSocket *sioc;
+
+    s->reconnect_timer = 0;
+
+    if (chr->be_open) {
+        return false;
+    }
+
+    sioc = qio_channel_socket_new();
+    tcp_chr_set_client_ioc_name(chr, sioc);
+    qio_channel_socket_connect_async(sioc, s->addr,
+                                     qemu_chr_socket_connected,
+                                     chr, NULL);
+
+    return false;
+}
+
+static void qmp_chardev_open_socket(Chardev *chr,
+                                    ChardevBackend *backend,
+                                    bool *be_opened,
+                                    Error **errp)
+{
+    SocketChardev *s = SOCKET_CHARDEV(chr);
+    ChardevSocket *sock = backend->u.socket.data;
+    SocketAddress *addr = sock->addr;
+    bool do_nodelay     = sock->has_nodelay ? sock->nodelay : false;
+    bool is_listen      = sock->has_server  ? sock->server  : true;
+    bool is_telnet      = sock->has_telnet  ? sock->telnet  : false;
+    bool is_waitconnect = sock->has_wait    ? sock->wait    : false;
+    int64_t reconnect   = sock->has_reconnect ? sock->reconnect : 0;
+    QIOChannelSocket *sioc = NULL;
+
+    s->is_unix = addr->type == SOCKET_ADDRESS_KIND_UNIX;
+    s->is_listen = is_listen;
+    s->is_telnet = is_telnet;
+    s->do_nodelay = do_nodelay;
+    if (sock->tls_creds) {
+        Object *creds;
+        creds = object_resolve_path_component(
+            object_get_objects_root(), sock->tls_creds);
+        if (!creds) {
+            error_setg(errp, "No TLS credentials with id '%s'",
+                       sock->tls_creds);
+            goto error;
+        }
+        s->tls_creds = (QCryptoTLSCreds *)
+            object_dynamic_cast(creds,
+                                TYPE_QCRYPTO_TLS_CREDS);
+        if (!s->tls_creds) {
+            error_setg(errp, "Object with id '%s' is not TLS credentials",
+                       sock->tls_creds);
+            goto error;
+        }
+        object_ref(OBJECT(s->tls_creds));
+        if (is_listen) {
+            if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
+                error_setg(errp, "%s",
+                           "Expected TLS credentials for server endpoint");
+                goto error;
+            }
+        } else {
+            if (s->tls_creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT) {
+                error_setg(errp, "%s",
+                           "Expected TLS credentials for client endpoint");
+                goto error;
+            }
+        }
+    }
+
+    s->addr = QAPI_CLONE(SocketAddress, sock->addr);
+
+    qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_RECONNECTABLE);
+    if (s->is_unix) {
+        qemu_chr_set_feature(chr, QEMU_CHAR_FEATURE_FD_PASS);
+    }
+
+    /* be isn't opened until we get a connection */
+    *be_opened = false;
+
+    chr->filename = SocketAddress_to_str("disconnected:",
+                                         addr, is_listen, is_telnet);
+
+    if (is_listen) {
+        if (is_telnet) {
+            s->do_telnetopt = 1;
+        }
+    } else if (reconnect > 0) {
+        s->reconnect_time = reconnect;
+    }
+
+    if (s->reconnect_time) {
+        sioc = qio_channel_socket_new();
+        tcp_chr_set_client_ioc_name(chr, sioc);
+        qio_channel_socket_connect_async(sioc, s->addr,
+                                         qemu_chr_socket_connected,
+                                         chr, NULL);
+    } else {
+        if (s->is_listen) {
+            char *name;
+            sioc = qio_channel_socket_new();
+
+            name = g_strdup_printf("chardev-tcp-listener-%s", chr->label);
+            qio_channel_set_name(QIO_CHANNEL(sioc), name);
+            g_free(name);
+
+            if (qio_channel_socket_listen_sync(sioc, s->addr, errp) < 0) {
+                goto error;
+            }
+            s->listen_ioc = sioc;
+            if (is_waitconnect &&
+                qemu_chr_wait_connected(chr, errp) < 0) {
+                return;
+            }
+            if (!s->ioc) {
+                s->listen_tag = qio_channel_add_watch(
+                    QIO_CHANNEL(s->listen_ioc), G_IO_IN,
+                    tcp_chr_accept, chr, NULL);
+            }
+        } else if (qemu_chr_wait_connected(chr, errp) < 0) {
+            goto error;
+        }
+    }
+
+    return;
+
+error:
+    if (sioc) {
+        object_unref(OBJECT(sioc));
+    }
+}
+
+static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
+                                  Error **errp)
+{
+    bool is_listen      = qemu_opt_get_bool(opts, "server", false);
+    bool is_waitconnect = is_listen && qemu_opt_get_bool(opts, "wait", true);
+    bool is_telnet      = qemu_opt_get_bool(opts, "telnet", false);
+    bool do_nodelay     = !qemu_opt_get_bool(opts, "delay", true);
+    int64_t reconnect   = qemu_opt_get_number(opts, "reconnect", 0);
+    const char *path = qemu_opt_get(opts, "path");
+    const char *host = qemu_opt_get(opts, "host");
+    const char *port = qemu_opt_get(opts, "port");
+    const char *tls_creds = qemu_opt_get(opts, "tls-creds");
+    SocketAddress *addr;
+    ChardevSocket *sock;
+
+    backend->type = CHARDEV_BACKEND_KIND_SOCKET;
+    if (!path) {
+        if (!host) {
+            error_setg(errp, "chardev: socket: no host given");
+            return;
+        }
+        if (!port) {
+            error_setg(errp, "chardev: socket: no port given");
+            return;
+        }
+    } else {
+        if (tls_creds) {
+            error_setg(errp, "TLS can only be used over TCP socket");
+            return;
+        }
+    }
+
+    sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
+    qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));
+
+    sock->has_nodelay = true;
+    sock->nodelay = do_nodelay;
+    sock->has_server = true;
+    sock->server = is_listen;
+    sock->has_telnet = true;
+    sock->telnet = is_telnet;
+    sock->has_wait = true;
+    sock->wait = is_waitconnect;
+    sock->has_reconnect = true;
+    sock->reconnect = reconnect;
+    sock->tls_creds = g_strdup(tls_creds);
+
+    addr = g_new0(SocketAddress, 1);
+    if (path) {
+        UnixSocketAddress *q_unix;
+        addr->type = SOCKET_ADDRESS_KIND_UNIX;
+        q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
+        q_unix->path = g_strdup(path);
+    } else {
+        addr->type = SOCKET_ADDRESS_KIND_INET;
+        addr->u.inet.data = g_new(InetSocketAddress, 1);
+        *addr->u.inet.data = (InetSocketAddress) {
+            .host = g_strdup(host),
+            .port = g_strdup(port),
+            .has_to = qemu_opt_get(opts, "to"),
+            .to = qemu_opt_get_number(opts, "to", 0),
+            .has_ipv4 = qemu_opt_get(opts, "ipv4"),
+            .ipv4 = qemu_opt_get_bool(opts, "ipv4", 0),
+            .has_ipv6 = qemu_opt_get(opts, "ipv6"),
+            .ipv6 = qemu_opt_get_bool(opts, "ipv6", 0),
+        };
+    }
+    sock->addr = addr;
+}
+
+static void char_socket_class_init(ObjectClass *oc, void *data)
+{
+    ChardevClass *cc = CHARDEV_CLASS(oc);
+
+    cc->parse = qemu_chr_parse_socket;
+    cc->open = qmp_chardev_open_socket;
+    cc->chr_wait_connected = tcp_chr_wait_connected;
+    cc->chr_write = tcp_chr_write;
+    cc->chr_sync_read = tcp_chr_sync_read;
+    cc->chr_disconnect = tcp_chr_disconnect;
+    cc->get_msgfds = tcp_get_msgfds;
+    cc->set_msgfds = tcp_set_msgfds;
+    cc->chr_add_client = tcp_chr_add_client;
+    cc->chr_add_watch = tcp_chr_add_watch;
+    cc->chr_update_read_handler = tcp_chr_update_read_handler;
+}
+
+static const TypeInfo char_socket_type_info = {
+    .name = TYPE_CHARDEV_SOCKET,
+    .parent = TYPE_CHARDEV,
+    .instance_size = sizeof(SocketChardev),
+    .instance_finalize = char_socket_finalize,
+    .class_init = char_socket_class_init,
+};
+
+static void register_types(void)
+{
+    type_register_static(&char_socket_type_info);
+}
+
+type_init(register_types);