diff options
| -rw-r--r-- | chardev/char-socket.c | 4 | ||||
| -rw-r--r-- | chardev/char.c | 7 | ||||
| -rw-r--r-- | qapi/sockets.json | 8 | ||||
| -rw-r--r-- | qemu-options.hx | 8 | ||||
| -rw-r--r-- | tests/test-util-sockets.c | 92 | ||||
| -rw-r--r-- | util/qemu-sockets.c | 39 |
6 files changed, 148 insertions, 10 deletions
diff --git a/chardev/char-socket.c b/chardev/char-socket.c index 232e0a8..e77699d 100644 --- a/chardev/char-socket.c +++ b/chardev/char-socket.c @@ -1380,6 +1380,8 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend, const char *host = qemu_opt_get(opts, "host"); const char *port = qemu_opt_get(opts, "port"); const char *fd = qemu_opt_get(opts, "fd"); + bool tight = qemu_opt_get_bool(opts, "tight", true); + bool abstract = qemu_opt_get_bool(opts, "abstract", false); SocketAddressLegacy *addr; ChardevSocket *sock; @@ -1431,6 +1433,8 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend, addr->type = SOCKET_ADDRESS_LEGACY_KIND_UNIX; q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1); q_unix->path = g_strdup(path); + q_unix->tight = tight; + q_unix->abstract = abstract; } else if (host) { addr->type = SOCKET_ADDRESS_LEGACY_KIND_INET; addr->u.inet.data = g_new(InetSocketAddress, 1); diff --git a/chardev/char.c b/chardev/char.c index 0196e28..ea06c5f 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -939,6 +939,13 @@ QemuOptsList qemu_chardev_opts = { },{ .name = "logappend", .type = QEMU_OPT_BOOL, + },{ + .name = "tight", + .type = QEMU_OPT_BOOL, + .def_value_str = "on", + },{ + .name = "abstract", + .type = QEMU_OPT_BOOL, }, { /* end of list */ } }, diff --git a/qapi/sockets.json b/qapi/sockets.json index ea933ed..cbd6ef3 100644 --- a/qapi/sockets.json +++ b/qapi/sockets.json @@ -73,12 +73,18 @@ # 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 the +# 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) # # Since: 1.3 ## { 'struct': 'UnixSocketAddress', 'data': { - 'path': 'str' } } + 'path': 'str', + '*tight': 'bool', + '*abstract': 'bool' } } ## # @VsockSocketAddress: diff --git a/qemu-options.hx b/qemu-options.hx index e2dca8a..93bde2b 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2938,7 +2938,7 @@ DEF("chardev", HAS_ARG, QEMU_OPTION_chardev, " [,server][,nowait][,telnet][,websocket][,reconnect=seconds][,mux=on|off]\n" " [,logfile=PATH][,logappend=on|off][,tls-creds=ID][,tls-authz=ID] (tcp)\n" "-chardev socket,id=id,path=path[,server][,nowait][,telnet][,websocket][,reconnect=seconds]\n" - " [,mux=on|off][,logfile=PATH][,logappend=on|off] (unix)\n" + " [,mux=on|off][,logfile=PATH][,logappend=on|off][,abstract=on|off][,tight=on|off] (unix)\n" "-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]\n" " [,localport=localport][,ipv4][,ipv6][,mux=on|off]\n" " [,logfile=PATH][,logappend=on|off]\n" @@ -3105,9 +3105,13 @@ The available backends are: ``nodelay`` disables the Nagle algorithm. - ``unix options: path=path`` + ``unix options: path=path[,abstract=on|off][,tight=on|off]`` ``path`` specifies the local path of the unix socket. ``path`` is required. + ``abstract`` specifies the use of the abstract socket namespace, + rather than the filesystem. Optional, defaults to false. + ``tight`` sets the socket length of abstract sockets to their minimum, + rather than the full sun_path length. Optional, defaults to true. ``-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr][,localport=localport][,ipv4][,ipv6]`` Sends all traffic from the guest to a remote host over UDP. diff --git a/tests/test-util-sockets.c b/tests/test-util-sockets.c index 5fd947c..2ca1e99 100644 --- a/tests/test-util-sockets.c +++ b/tests/test-util-sockets.c @@ -227,6 +227,93 @@ static void test_socket_fd_pass_num_nocli(void) g_free(addr.u.fd.str); } +#ifdef __linux__ +static gchar *abstract_sock_name; + +static gpointer unix_server_thread_func(gpointer user_data) +{ + SocketAddress addr; + Error *err = NULL; + int fd = -1; + int connfd = -1; + struct sockaddr_un un; + socklen_t len = sizeof(un); + + addr.type = SOCKET_ADDRESS_TYPE_UNIX; + addr.u.q_unix.path = abstract_sock_name; + addr.u.q_unix.tight = user_data != NULL; + addr.u.q_unix.abstract = true; + + fd = socket_listen(&addr, 1, &err); + g_assert_cmpint(fd, >=, 0); + g_assert(fd_is_socket(fd)); + + connfd = accept(fd, (struct sockaddr *)&un, &len); + g_assert_cmpint(connfd, !=, -1); + + close(fd); + + return NULL; +} + +static gpointer unix_client_thread_func(gpointer user_data) +{ + SocketAddress addr; + Error *err = NULL; + int fd = -1; + + addr.type = SOCKET_ADDRESS_TYPE_UNIX; + addr.u.q_unix.path = abstract_sock_name; + addr.u.q_unix.tight = user_data != NULL; + addr.u.q_unix.abstract = true; + + fd = socket_connect(&addr, &err); + + g_assert_cmpint(fd, >=, 0); + + close(fd); + + return NULL; +} + +static void test_socket_unix_abstract_good(void) +{ + GRand *r = g_rand_new(); + + abstract_sock_name = g_strdup_printf("unix-%d-%d", getpid(), + g_rand_int_range(r, 100, 1000)); + + /* non tight socklen serv and cli */ + GThread *serv = g_thread_new("abstract_unix_server", + unix_server_thread_func, + NULL); + + sleep(1); + + GThread *cli = g_thread_new("abstract_unix_client", + unix_client_thread_func, + NULL); + + g_thread_join(cli); + g_thread_join(serv); + + /* tight socklen serv and cli */ + serv = g_thread_new("abstract_unix_server", + unix_server_thread_func, + (gpointer)1); + + sleep(1); + + cli = g_thread_new("abstract_unix_client", + unix_client_thread_func, + (gpointer)1); + + g_thread_join(cli); + g_thread_join(serv); + + g_free(abstract_sock_name); +} +#endif int main(int argc, char **argv) { @@ -265,6 +352,11 @@ int main(int argc, char **argv) test_socket_fd_pass_num_nocli); } +#ifdef __linux__ + g_test_add_func("/util/socket/unix-abstract/good", + test_socket_unix_abstract_good); +#endif + end: return g_test_run(); } diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c index 86c48b9..b37d288 100644 --- a/util/qemu-sockets.c +++ b/util/qemu-sockets.c @@ -863,6 +863,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, char *pathbuf = NULL; const char *path; size_t pathlen; + size_t addrlen; sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); if (sock < 0) { @@ -879,9 +880,11 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, } pathlen = strlen(path); - if (pathlen > sizeof(un.sun_path)) { + if (pathlen > sizeof(un.sun_path) || + (saddr->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 : sizeof(un.sun_path)); goto err; } @@ -903,7 +906,7 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, close(fd); } - if (unlink(path) < 0 && errno != ENOENT) { + if (!saddr->abstract && unlink(path) < 0 && errno != ENOENT) { error_setg_errno(errp, errno, "Failed to unlink socket %s", path); goto err; @@ -911,9 +914,19 @@ static int unix_listen_saddr(UnixSocketAddress *saddr, memset(&un, 0, sizeof(un)); un.sun_family = AF_UNIX; - memcpy(un.sun_path, path, pathlen); + addrlen = sizeof(un); - if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { + if (saddr->abstract) { + un.sun_path[0] = '\0'; + memcpy(&un.sun_path[1], path, pathlen); + if (saddr->tight) { + addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; + } + } else { + memcpy(un.sun_path, path, pathlen); + } + + if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) { error_setg_errno(errp, errno, "Failed to bind socket to %s", path); goto err; } @@ -936,6 +949,7 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) struct sockaddr_un un; int sock, rc; size_t pathlen; + size_t addrlen; if (saddr->path == NULL) { error_setg(errp, "unix connect: no path specified"); @@ -949,21 +963,32 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) } pathlen = strlen(saddr->path); - if (pathlen > sizeof(un.sun_path)) { + if (pathlen > sizeof(un.sun_path) || + (saddr->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 : sizeof(un.sun_path)); goto err; } memset(&un, 0, sizeof(un)); un.sun_family = AF_UNIX; - memcpy(un.sun_path, saddr->path, pathlen); + addrlen = sizeof(un); + if (saddr->abstract) { + un.sun_path[0] = '\0'; + memcpy(&un.sun_path[1], saddr->path, pathlen); + if (saddr->tight) { + addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; + } + } else { + memcpy(un.sun_path, saddr->path, pathlen); + } /* connect to peer */ do { rc = 0; - if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) { + if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) { rc = -errno; } } while (rc == -EINTR); |