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bh=lEOqmY0horA8tHnMnTB3VLfYBB5uxXeU66rFKkuaMuw=; b=MsZ8yqzeFAf2M6qX8nPX9KVR40l85OjbI8y4gHgpG2l4NCvS4cEs5JHbu6QJmpSFF/k+xs ZTKnSq3ygC7xDu+f7hPqbl+TT6i0pyDiDFph+ePWvYF6K+Vfv+LF7Zu8sARaCWqgzXJbFh yWzo+3/K+yB46Iizt6hGqDKtRai4kME= X-MC-Unique: qcW6FDraMJSL8WnnupMMSg-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH v2 11/11] sockets: Make abstract UnixSocketAddress depend on CONFIG_LINUX Date: Mon, 2 Nov 2020 10:44:22 +0100 Message-Id: <20201102094422.173975-12-armbru@redhat.com> In-Reply-To: <20201102094422.173975-1-armbru@redhat.com> References: <20201102094422.173975-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" The abstract socket namespace is a non-portable Linux extension. An attempt to use it elsewhere should fail with ENOENT (the abstract address looks like a "" pathname, which does not resolve). We report this failure like Failed to connect socket abc: No such file or directory Tolerable, although ENOTSUP would be better. However, introspection lies: it has @abstract regardless of host support. Easy enough to fix: since Linux provides them since 2.2, 'if': 'defined(CONFIG_LINUX)' should do. The above failure becomes Parameter 'backend.data.addr.data.abstract' is unexpected I consider this an improvement. Reviewed-by: Paolo Bonzini Signed-off-by: Markus Armbruster Reviewed-by: Eric Blake --- qapi/sockets.json | 14 ++++++++------ chardev/char-socket.c | 22 +++++++++++++++------ chardev/char.c | 2 ++ tests/test-util-sockets.c | 7 ++++--- util/qemu-sockets.c | 40 +++++++++++++++++++++++++++++---------- 5 files changed, 60 insertions(+), 25 deletions(-) diff --git a/qapi/sockets.json b/qapi/sockets.json index c0c640a5b0..2e83452797 100644 --- a/qapi/sockets.json +++ b/qapi/sockets.json @@ -74,18 +74,20 @@ # Captures a socket address in the local ("Unix socket") namespace. # # @path: filesystem path to use -# @tight: pass a socket address length confined to the minimum length of t= he -# abstract string, rather than the full sockaddr_un record length -# (only matters for abstract sockets, default true). (Since 5.1) -# @abstract: whether this is an abstract address, default false. (Since 5.= 1) +# @abstract: if true, this is a Linux abstract socket address. @path +# will be prefixed by a null byte, and optionally padded +# with null bytes. Defaults to false. (Since 5.1) +# @tight: if false, pad an abstract socket address with enough null +# bytes to make it fill struct sockaddr_un member sun_path. +# Defaults to true. (Since 5.1) # # Since: 1.3 ## { 'struct': 'UnixSocketAddress', 'data': { 'path': 'str', - '*tight': 'bool', - '*abstract': 'bool' } } + '*abstract': { 'type': 'bool', 'if': 'defined(CONFIG_LINUX)' }, + '*tight': { 'type': 'bool', 'if': 'defined(CONFIG_LINUX)' } } } =20 ## # @VsockSocketAddress: diff --git a/chardev/char-socket.c b/chardev/char-socket.c index dc1cf86ecf..213a4c8dd0 100644 --- a/chardev/char-socket.c +++ b/chardev/char-socket.c @@ -444,14 +444,20 @@ static char *qemu_chr_socket_address(SocketChardev *s= , const char *prefix) break; case SOCKET_ADDRESS_TYPE_UNIX: { + const char *tight =3D "", *abstract =3D ""; UnixSocketAddress *sa =3D &s->addr->u.q_unix; =20 - return g_strdup_printf("%sunix:%s%s%s%s", prefix, - s->addr->u.q_unix.path, - sa->has_abstract && sa->abstract - ? ",abstract" : "", - sa->has_tight && sa->tight - ? ",tight" : "", +#ifdef CONFIG_LINUX + if (sa->has_abstract && sa->abstract) { + abstract =3D ",abstract"; + if (sa->has_tight && sa->tight) { + tight =3D ",tight"; + } + } +#endif + + return g_strdup_printf("%sunix:%s%s%s%s", prefix, sa->path, + abstract, tight, s->is_listen ? ",server" : ""); break; } @@ -1394,8 +1400,10 @@ static void qemu_chr_parse_socket(QemuOpts *opts, Ch= ardevBackend *backend, const char *host =3D qemu_opt_get(opts, "host"); const char *port =3D qemu_opt_get(opts, "port"); const char *fd =3D qemu_opt_get(opts, "fd"); +#ifdef CONFIG_LINUX bool tight =3D qemu_opt_get_bool(opts, "tight", true); bool abstract =3D qemu_opt_get_bool(opts, "abstract", false); +#endif SocketAddressLegacy *addr; ChardevSocket *sock; =20 @@ -1447,10 +1455,12 @@ static void qemu_chr_parse_socket(QemuOpts *opts, C= hardevBackend *backend, addr->type =3D SOCKET_ADDRESS_LEGACY_KIND_UNIX; q_unix =3D addr->u.q_unix.data =3D g_new0(UnixSocketAddress, 1); q_unix->path =3D g_strdup(path); +#ifdef CONFIG_LINUX q_unix->has_tight =3D true; q_unix->tight =3D tight; q_unix->has_abstract =3D true; q_unix->abstract =3D abstract; +#endif } else if (host) { addr->type =3D SOCKET_ADDRESS_LEGACY_KIND_INET; addr->u.inet.data =3D g_new(InetSocketAddress, 1); diff --git a/chardev/char.c b/chardev/char.c index 78553125d3..aa4282164a 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -928,6 +928,7 @@ QemuOptsList qemu_chardev_opts =3D { },{ .name =3D "logappend", .type =3D QEMU_OPT_BOOL, +#ifdef CONFIG_LINUX },{ .name =3D "tight", .type =3D QEMU_OPT_BOOL, @@ -935,6 +936,7 @@ QemuOptsList qemu_chardev_opts =3D { },{ .name =3D "abstract", .type =3D QEMU_OPT_BOOL, +#endif }, { /* end of list */ } }, diff --git a/tests/test-util-sockets.c b/tests/test-util-sockets.c index 7ecf95579b..67486055ed 100644 --- a/tests/test-util-sockets.c +++ b/tests/test-util-sockets.c @@ -229,7 +229,7 @@ static void test_socket_fd_pass_num_nocli(void) } #endif =20 -#ifdef __linux__ +#ifdef CONFIG_LINUX =20 #define ABSTRACT_SOCKET_VARIANTS 3 =20 @@ -326,7 +326,8 @@ static void test_socket_unix_abstract(void) =20 g_free(addr.u.q_unix.path); } -#endif + +#endif /* CONFIG_LINUX */ =20 int main(int argc, char **argv) { @@ -368,7 +369,7 @@ int main(int argc, char **argv) #endif } =20 -#ifdef __linux__ +#ifdef CONFIG_LINUX g_test_add_func("/util/socket/unix-abstract", test_socket_unix_abstract); #endif diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index 671717499f..8af0278f15 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -860,10 +860,29 @@ static int vsock_parse(VsockSocketAddress *addr, cons= t char *str, =20 #ifndef _WIN32 =20 +static bool saddr_is_abstract(UnixSocketAddress *saddr) +{ +#ifdef CONFIG_LINUX + return saddr->abstract; +#else + return false; +#endif +} + +static bool saddr_is_tight(UnixSocketAddress *saddr) +{ +#ifdef CONFIG_LINUX + return !saddr->has_tight || saddr->tight; +#else + return false; +#endif +} + static int unix_listen_saddr(UnixSocketAddress *saddr, int num, Error **errp) { + bool abstract =3D saddr_is_abstract(saddr); struct sockaddr_un un; int sock, fd; char *pathbuf =3D NULL; @@ -877,7 +896,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, return -1; } =20 - if (saddr->path[0] || saddr->abstract) { + if (saddr->path[0] || abstract) { path =3D saddr->path; } else { const char *tmpdir =3D getenv("TMPDIR"); @@ -887,10 +906,10 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, =20 pathlen =3D strlen(path); if (pathlen > sizeof(un.sun_path) || - (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { + (abstract && pathlen > (sizeof(un.sun_path) - 1))) { error_setg(errp, "UNIX socket path '%s' is too long", path); error_append_hint(errp, "Path must be less than %zu bytes\n", - saddr->abstract ? sizeof(un.sun_path) - 1 : + abstract ? sizeof(un.sun_path) - 1 : sizeof(un.sun_path)); goto err; } @@ -912,7 +931,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, close(fd); } =20 - if (!saddr->abstract && unlink(path) < 0 && errno !=3D ENOENT) { + if (!abstract && unlink(path) < 0 && errno !=3D ENOENT) { error_setg_errno(errp, errno, "Failed to unlink socket %s", path); goto err; @@ -922,10 +941,10 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, un.sun_family =3D AF_UNIX; addrlen =3D sizeof(un); =20 - if (saddr->abstract) { + if (abstract) { un.sun_path[0] =3D '\0'; memcpy(&un.sun_path[1], path, pathlen); - if (!saddr->has_tight || saddr->tight) { + if (saddr_is_tight(saddr)) { addrlen =3D offsetof(struct sockaddr_un, sun_path) + 1 + pathl= en; } } else { @@ -952,6 +971,7 @@ err: =20 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) { + bool abstract =3D saddr_is_abstract(saddr); struct sockaddr_un un; int sock, rc; size_t pathlen; @@ -970,10 +990,10 @@ static int unix_connect_saddr(UnixSocketAddress *sadd= r, Error **errp) =20 pathlen =3D strlen(saddr->path); if (pathlen > sizeof(un.sun_path) || - (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { + (abstract && pathlen > (sizeof(un.sun_path) - 1))) { error_setg(errp, "UNIX socket path '%s' is too long", saddr->path); error_append_hint(errp, "Path must be less than %zu bytes\n", - saddr->abstract ? sizeof(un.sun_path) - 1 : + abstract ? sizeof(un.sun_path) - 1 : sizeof(un.sun_path)); goto err; } @@ -982,10 +1002,10 @@ static int unix_connect_saddr(UnixSocketAddress *sad= dr, Error **errp) un.sun_family =3D AF_UNIX; addrlen =3D sizeof(un); =20 - if (saddr->abstract) { + if (abstract) { un.sun_path[0] =3D '\0'; memcpy(&un.sun_path[1], saddr->path, pathlen); - if (!saddr->has_tight || saddr->tight) { + if (saddr_is_tight(saddr)) { addrlen =3D offsetof(struct sockaddr_un, sun_path) + 1 + pathl= en; } } else { --=20 2.26.2