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X-Received-From: 2607:f8b0:4003:c01::233 Cc: mjg59@srcf.ucam.org, Corey Minyard , hwd@huawei.com, bcketchum@gmail.com, mst@redhat.com, afaerber@suse.de Subject: [Qemu-devel] [PATCH 5/6] qemu-char: Add reconnecting to client sockets X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Corey Minyard Adds a "reconnect" option to socket backends that gives a reconnect timeout. This only applies to client sockets. If the other end of a socket closes the connection, qemu will attempt to reconnect after the given number of seconds. Signed-off-by: Corey Minyard --- qapi-schema.json | 15 ++++++---- qemu-char.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++---- qemu-options.hx | 20 ++++++++----- 3 files changed, 105 insertions(+), 18 deletions(-) diff --git a/qapi-schema.json b/qapi-schema.json index 4bfaf20..148097b 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -2651,14 +2651,19 @@ # @nodelay: #optional set TCP_NODELAY socket option (default: false) # @telnet: #optional enable telnet protocol on server # sockets (default: false) +# @reconnect: #optional For a client socket, if a socket is disconnected, +# then attempt a reconnect after the given number of seconds. +# Setting this to zero disables this function. (default: 0) +# (Since: 2.2) # # Since: 1.4 ## -{ 'type': 'ChardevSocket', 'data': { 'addr' : 'SocketAddress', - '*server' : 'bool', - '*wait' : 'bool', - '*nodelay' : 'bool', - '*telnet' : 'bool' } } +{ 'type': 'ChardevSocket', 'data': { 'addr' : 'SocketAddress', + '*server' : 'bool', + '*wait' : 'bool', + '*nodelay' : 'bool', + '*telnet' : 'bool', + '*reconnect' : 'int' } } ## # @ChardevUdp: diff --git a/qemu-char.c b/qemu-char.c index b118e88..f33173c 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -2501,8 +2501,20 @@ typedef struct { SocketAddress *addr; bool is_listen; bool is_telnet; + + guint reconnect_timer; + int64_t reconnect_time; } TCPCharDriver; +static gboolean socket_reconnect_timeout(gpointer opaque); + +static void qemu_chr_socket_restart_timer(CharDriverState *chr) +{ + TCPCharDriver *s = chr->opaque; + s->reconnect_timer = g_timeout_add_seconds(s->reconnect_time, + socket_reconnect_timeout, chr); +} + static gboolean tcp_chr_accept(GIOChannel *chan, GIOCondition cond, void *opaque); #ifndef _WIN32 @@ -2784,6 +2796,9 @@ static void tcp_chr_disconnect(CharDriverState *chr) SocketAddress_to_str(chr->filename, CHR_MAX_FILENAME_SIZE, "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(GIOChannel *chan, GIOCondition cond, void *opaque) @@ -2964,6 +2979,10 @@ static void tcp_chr_close(CharDriverState *chr) TCPCharDriver *s = chr->opaque; int i; + if (s->reconnect_timer) { + g_source_remove(s->reconnect_timer); + s->reconnect_timer = 0; + } qapi_free_SocketAddress(s->addr); if (s->fd >= 0) { remove_fd_in_watch(chr); @@ -3013,7 +3032,28 @@ static bool qemu_chr_finish_socket_connection(CharDriverState *chr, int fd, tcp_chr_connect(chr); } - return chr; + return true; +} + +static void qemu_chr_socket_connected(int fd, void *opaque) +{ + CharDriverState *chr = opaque; + TCPCharDriver *s = chr->opaque; + Error *err = NULL; + + if (fd >= 0) { + if (qemu_chr_finish_socket_connection(chr, fd, &err)) { + return; + } + if (err) { + error_report("%s", error_get_pretty(err)); + error_free(err); + } + closesocket(fd); + } + + s->connected = 0; + qemu_chr_socket_restart_timer(chr); } static bool qemu_chr_open_socket_fd(CharDriverState *chr, Error **errp) @@ -3023,7 +3063,10 @@ static bool qemu_chr_open_socket_fd(CharDriverState *chr, Error **errp) if (s->is_listen) { fd = socket_listen(s->addr, errp); - } else { + } else if (s->reconnect_time) { + fd = socket_connect(s->addr, errp, qemu_chr_socket_connected, chr); + return fd >= 0; + } else { fd = socket_connect(s->addr, errp, NULL, NULL); } if (fd < 0) { @@ -3450,6 +3493,7 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend, 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"); @@ -3476,6 +3520,8 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend, backend->socket->telnet = is_telnet; backend->socket->has_wait = true; backend->socket->wait = is_waitconnect; + backend->socket->has_reconnect = true; + backend->socket->reconnect = reconnect; addr = g_new0(SocketAddress, 1); if (path) { @@ -3875,6 +3921,9 @@ QemuOptsList qemu_chardev_opts = { .name = "delay", .type = QEMU_OPT_BOOL, },{ + .name = "reconnect", + .type = QEMU_OPT_NUMBER, + },{ .name = "telnet", .type = QEMU_OPT_BOOL, },{ @@ -4018,6 +4067,26 @@ static CharDriverState *qmp_chardev_open_parallel(ChardevHostdev *parallel, #endif /* WIN32 */ +static gboolean socket_reconnect_timeout(gpointer opaque) +{ + CharDriverState *chr = opaque; + TCPCharDriver *s = chr->opaque; + Error *err; + + s->reconnect_timer = 0; + + if (chr->be_open) { + return false; + } + + if (!qemu_chr_open_socket_fd(chr, &err)) { + error_report("Unable to connect to char device %s\n", chr->label); + qemu_chr_socket_restart_timer(chr); + } + + return false; +} + static CharDriverState *qmp_chardev_open_socket(ChardevSocket *sock, Error **errp) { @@ -4028,6 +4097,7 @@ static CharDriverState *qmp_chardev_open_socket(ChardevSocket *sock, 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; chr = qemu_chr_alloc(); s = g_malloc0(sizeof(TCPCharDriver)); @@ -4060,13 +4130,19 @@ static CharDriverState *qmp_chardev_open_socket(ChardevSocket *sock, if (is_telnet) { s->do_telnetopt = 1; } + } else if (reconnect > 0) { + s->reconnect_time = reconnect; } if (!qemu_chr_open_socket_fd(chr, errp)) { - g_free(s); - g_free(chr->filename); - g_free(chr); - return NULL; + if (s->reconnect_time) { + qemu_chr_socket_restart_timer(chr); + } else { + g_free(s); + g_free(chr->filename); + g_free(chr); + return NULL; + } } if (is_listen && is_waitconnect) { diff --git a/qemu-options.hx b/qemu-options.hx index 365b56c..22cf3b9 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -1930,9 +1930,9 @@ ETEXI DEF("chardev", HAS_ARG, QEMU_OPTION_chardev, "-chardev null,id=id[,mux=on|off]\n" - "-chardev socket,id=id[,host=host],port=port[,to=to][,ipv4][,ipv6][,nodelay]\n" - " [,server][,nowait][,telnet][,mux=on|off] (tcp)\n" - "-chardev socket,id=id,path=path[,server][,nowait][,telnet],[mux=on|off] (unix)\n" + "-chardev socket,id=id[,host=host],port=port[,to=to][,ipv4][,ipv6][,nodelay][,reconnect=seconds]\n" + " [,server][,nowait][,telnet][,reconnect=seconds][,mux=on|off] (tcp)\n" + "-chardev socket,id=id,path=path[,server][,nowait][,telnet][,reconnect=seconds][,mux=on|off] (unix)\n" "-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]\n" " [,localport=localport][,ipv4][,ipv6][,mux=on|off]\n" "-chardev msmouse,id=id[,mux=on|off]\n" @@ -2004,7 +2004,7 @@ Options to each backend are described below. A void device. This device will not emit any data, and will drop any data it receives. The null backend does not take any options. -@item -chardev socket ,id=@var{id} [@var{TCP options} or @var{unix options}] [,server] [,nowait] [,telnet] +@item -chardev socket ,id=@var{id} [@var{TCP options} or @var{unix options}] [,server] [,nowait] [,telnet] [,reconnect=@var{seconds}] Create a two-way stream socket, which can be either a TCP or a unix socket. A unix socket will be created if @option{path} is specified. Behaviour is @@ -2018,6 +2018,10 @@ connect to a listening socket. @option{telnet} specifies that traffic on the socket should interpret telnet escape sequences. +@option{reconnect} sets the timeout for reconnecting on non-server sockets when +the remote end goes away. qemu will delay this many seconds and then attempt +to reconnect. Zero disables reconnecting, and is the default. + TCP and unix socket options are given below: @table @option @@ -2687,14 +2691,16 @@ telnet on port 5555 to access the QEMU port. localhost 5555 @end table -@item tcp:[@var{host}]:@var{port}[,@var{server}][,nowait][,nodelay] +@item tcp:[@var{host}]:@var{port}[,@var{server}][,nowait][,nodelay][,reconnect=@var{seconds}] The TCP Net Console has two modes of operation. It can send the serial I/O to a location or wait for a connection from a location. By default the TCP Net Console is sent to @var{host} at the @var{port}. If you use the @var{server} option QEMU will wait for a client socket application to connect to the port before continuing, unless the @code{nowait} option was specified. The @code{nodelay} option disables the Nagle buffering -algorithm. If @var{host} is omitted, 0.0.0.0 is assumed. Only +algorithm. The @code{reconnect} option only applies if @var{noserver} is +set, if the connection goes down it will attempt to reconnect at the +given interval. If @var{host} is omitted, 0.0.0.0 is assumed. Only one TCP connection at a time is accepted. You can use @code{telnet} to connect to the corresponding character device. @table @code @@ -2715,7 +2721,7 @@ MAGIC_SYSRQ sequence if you use a telnet that supports sending the break sequence. Typically in unix telnet you do it with Control-] and then type "send break" followed by pressing the enter key. -@item unix:@var{path}[,server][,nowait] +@item unix:@var{path}[,server][,nowait][,reconnect=@var{seconds}] A unix domain socket is used instead of a tcp socket. The option works the same as if you had specified @code{-serial tcp} except the unix domain socket @var{path} is used for connections.