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authorDaniel P. Berrange <berrange@redhat.com>2017-12-21 12:57:54 +0000
committerDaniel P. Berrangé <berrange@redhat.com>2018-03-13 18:06:06 +0000
commit0935700f8544033ebbd41e1f13cd528f8a58d24d (patch)
tree31ceebc8098909d052f6a961f4231579a6ed87ff /tests/test-char.c
parent9bb4060c998e56976b36ee628ce7e0ecbd8ffb49 (diff)
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char: allow passing pre-opened socket file descriptor at startup
When starting QEMU management apps will usually setup a monitor socket, and then open it immediately after startup. If not using QEMU's own -daemonize arg, this process can be troublesome to handle correctly. The mgmt app will need to repeatedly call connect() until it succeeds, because it does not know when QEMU has created the listener socket. If can't retry connect() forever though, because an error might have caused QEMU to exit before it even creates the monitor. The obvious way to fix this kind of problem is to just pass in a pre-opened socket file descriptor for the QEMU monitor to listen on. The management app can now immediately call connect() just once. If connect() fails it knows that QEMU has exited with an error. The SocketAddress(Legacy) structs allow for FD passing via the monitor, and now via inherited file descriptors from the process that spawned QEMU. The final missing piece is adding a 'fd' parameter in the socket chardev options. This allows both HMP usage, pass any FD number with SCM_RIGHTS, then running HMP commands: getfd myfd chardev-add socket,fd=myfd Note that numeric FDs cannot be referenced directly in HMP, only named FDs. And also CLI usage, by leak FD 3 from parent by clearing O_CLOEXEC, then spawning QEMU with -chardev socket,fd=3,id=mon -mon chardev=mon,mode=control Note that named FDs cannot be referenced in CLI args, only numeric FDs. We do not wire this up in the legacy chardev syntax, so you cannot use FD passing with '-qmp', you must use the modern '-mon' + '-chardev' pair. When passing pre-opened FDs there is a restriction on use of TLS encryption. It can be used on a server socket chardev, but cannot be used for a client socket chardev. This is because when validating a server's certificate, the client needs to have a hostname available to match against the certificate identity. An illustrative example of usage is: #!/usr/bin/perl use IO::Socket::UNIX; use Fcntl; unlink "/tmp/qmp"; my $srv = IO::Socket::UNIX->new( Type => SOCK_STREAM(), Local => "/tmp/qmp", Listen => 1, ); my $flags = fcntl $srv, F_GETFD, 0; fcntl $srv, F_SETFD, $flags & ~FD_CLOEXEC; my $fd = $srv->fileno(); exec "qemu-system-x86_64", \ "-chardev", "socket,fd=$fd,server,nowait,id=mon", \ "-mon", "chardev=mon,mode=control"; Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'tests/test-char.c')
-rw-r--r--tests/test-char.c47
1 files changed, 44 insertions, 3 deletions
diff --git a/tests/test-char.c b/tests/test-char.c
index b3a77af..dffb354 100644
--- a/tests/test-char.c
+++ b/tests/test-char.c
@@ -302,9 +302,8 @@ static int socket_can_read_hello(void *opaque)
return 10;
}
-static void char_socket_test(void)
+static void char_socket_test_common(Chardev *chr)
{
- Chardev *chr = qemu_chr_new("server", "tcp:127.0.0.1:0,server,nowait");
Chardev *chr_client;
QObject *addr;
QDict *qdict;
@@ -359,6 +358,47 @@ static void char_socket_test(void)
object_unparent(OBJECT(chr));
}
+
+static void char_socket_basic_test(void)
+{
+ Chardev *chr = qemu_chr_new("server", "tcp:127.0.0.1:0,server,nowait");
+
+ char_socket_test_common(chr);
+}
+
+
+static void char_socket_fdpass_test(void)
+{
+ Chardev *chr;
+ char *optstr;
+ QemuOpts *opts;
+ int fd;
+ SocketAddress *addr = g_new0(SocketAddress, 1);
+
+ addr->type = SOCKET_ADDRESS_TYPE_INET;
+ addr->u.inet.host = g_strdup("127.0.0.1");
+ addr->u.inet.port = g_strdup("0");
+
+ fd = socket_listen(addr, &error_abort);
+ g_assert(fd >= 0);
+
+ qapi_free_SocketAddress(addr);
+
+ optstr = g_strdup_printf("socket,id=cdev,fd=%d,server,nowait", fd);
+
+ opts = qemu_opts_parse_noisily(qemu_find_opts("chardev"),
+ optstr, true);
+ g_free(optstr);
+ g_assert_nonnull(opts);
+
+ chr = qemu_chr_new_from_opts(opts, &error_abort);
+
+ qemu_opts_del(opts);
+
+ char_socket_test_common(chr);
+}
+
+
#ifndef _WIN32
static void char_pipe_test(void)
{
@@ -775,7 +815,8 @@ int main(int argc, char **argv)
#ifndef _WIN32
g_test_add_func("/char/file-fifo", char_file_fifo_test);
#endif
- g_test_add_func("/char/socket", char_socket_test);
+ g_test_add_func("/char/socket/basic", char_socket_basic_test);
+ g_test_add_func("/char/socket/fdpass", char_socket_fdpass_test);
g_test_add_func("/char/udp", char_udp_test);
#ifdef HAVE_CHARDEV_SERIAL
g_test_add_func("/char/serial", char_serial_test);