X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd-bus%2Fsd-bus.c;h=1244ec2f6dd051df9d04a3e434b2e45e5f4fd7b4;hp=11194af007609651fa0ffac1ba5614cd1051f305;hb=626851be97b4332fc0401d754c81ae7bbc0f5dc4;hpb=62b5c2aec12e6a3d305445ee1a88bc18ca0a1548 diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c index 11194af00..1244ec2f6 100644 --- a/src/libsystemd-bus/sd-bus.c +++ b/src/libsystemd-bus/sd-bus.c @@ -44,6 +44,9 @@ #include "bus-control.h" #include "bus-introspect.h" #include "bus-signature.h" +#include "bus-objects.h" +#include "bus-util.h" +#include "bus-container.h" static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec); @@ -73,36 +76,54 @@ static void bus_node_destroy(sd_bus *b, struct node *n) { bus_node_destroy(b, n->child); while ((c = n->callbacks)) { - LIST_REMOVE(struct node_callback, callbacks, n->callbacks, c); + LIST_REMOVE(callbacks, n->callbacks, c); free(c); } while ((v = n->vtables)) { - LIST_REMOVE(struct node_vtable, vtables, n->vtables, v); + LIST_REMOVE(vtables, n->vtables, v); free(v->interface); free(v); } while ((e = n->enumerators)) { - LIST_REMOVE(struct node_enumerator, enumerators, n->enumerators, e); + LIST_REMOVE(enumerators, n->enumerators, e); free(e); } if (n->parent) - LIST_REMOVE(struct node, siblings, n->parent->child, n); + LIST_REMOVE(siblings, n->parent->child, n); assert_se(hashmap_remove(b->nodes, n->path) == n); free(n->path); free(n); } +static void bus_reset_queues(sd_bus *b) { + unsigned i; + + assert(b); + + for (i = 0; i < b->rqueue_size; i++) + sd_bus_message_unref(b->rqueue[i]); + free(b->rqueue); + + for (i = 0; i < b->wqueue_size; i++) + sd_bus_message_unref(b->wqueue[i]); + free(b->wqueue); + + b->rqueue = b->wqueue = NULL; + b->rqueue_size = b->wqueue_size = 0; +} + static void bus_free(sd_bus *b) { struct filter_callback *f; struct node *n; - unsigned i; assert(b); + sd_bus_detach_event(b); + bus_close_fds(b); if (b->kdbus_buffer) @@ -113,6 +134,7 @@ static void bus_free(sd_bus *b) { free(b->auth_buffer); free(b->address); free(b->kernel); + free(b->machine); free(b->exec_path); strv_free(b->exec_argv); @@ -120,19 +142,13 @@ static void bus_free(sd_bus *b) { close_many(b->fds, b->n_fds); free(b->fds); - for (i = 0; i < b->rqueue_size; i++) - sd_bus_message_unref(b->rqueue[i]); - free(b->rqueue); - - for (i = 0; i < b->wqueue_size; i++) - sd_bus_message_unref(b->wqueue[i]); - free(b->wqueue); + bus_reset_queues(b); hashmap_free_free(b->reply_callbacks); prioq_free(b->reply_callbacks_prioq); while ((f = b->filter_callbacks)) { - LIST_REMOVE(struct filter_callback, callbacks, b->filter_callbacks, f); + LIST_REMOVE(callbacks, b->filter_callbacks, f); free(f); } @@ -153,11 +169,10 @@ static void bus_free(sd_bus *b) { free(b); } -int sd_bus_new(sd_bus **ret) { +_public_ int sd_bus_new(sd_bus **ret) { sd_bus *r; - if (!ret) - return -EINVAL; + assert_return(ret, -EINVAL); r = new0(sd_bus, 1); if (!r) @@ -166,7 +181,9 @@ int sd_bus_new(sd_bus **ret) { r->n_ref = REFCNT_INIT; r->input_fd = r->output_fd = -1; r->message_version = 1; + r->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME; r->hello_flags |= KDBUS_HELLO_ACCEPT_FD; + r->attach_flags |= KDBUS_ATTACH_NAMES; r->original_pid = getpid(); assert_se(pthread_mutex_init(&r->memfd_cache_mutex, NULL) == 0); @@ -183,17 +200,13 @@ int sd_bus_new(sd_bus **ret) { return 0; } -int sd_bus_set_address(sd_bus *bus, const char *address) { +_public_ int sd_bus_set_address(sd_bus *bus, const char *address) { char *a; - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (!address) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(address, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); a = strdup(address); if (!a) @@ -205,36 +218,26 @@ int sd_bus_set_address(sd_bus *bus, const char *address) { return 0; } -int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (input_fd < 0) - return -EINVAL; - if (output_fd < 0) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) { + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(input_fd >= 0, -EINVAL); + assert_return(output_fd >= 0, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); bus->input_fd = input_fd; bus->output_fd = output_fd; return 0; } -int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) { +_public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) { char *p, **a; - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (!path) - return -EINVAL; - if (strv_isempty(argv)) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(path, -EINVAL); + assert_return(!strv_isempty(argv), -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); p = strdup(path); if (!p) @@ -255,152 +258,78 @@ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) { return 0; } -int sd_bus_set_bus_client(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_set_bus_client(sd_bus *bus, int b) { + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); bus->bus_client = !!b; return 0; } -int sd_bus_negotiate_fds(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_negotiate_fds(sd_bus *bus, int b) { + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b); return 0; } -int sd_bus_negotiate_attach_comm(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; - - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_COMM, b); - return 0; -} - -int sd_bus_negotiate_attach_exe(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; - - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_EXE, b); - return 0; -} - -int sd_bus_negotiate_attach_cmdline(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; - - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_CMDLINE, b); - return 0; -} - -int sd_bus_negotiate_attach_cgroup(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; - - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_CGROUP, b); - return 0; -} - -int sd_bus_negotiate_attach_caps(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_negotiate_attach_timestamp(sd_bus *bus, int b) { + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_CAPS, b); + SET_FLAG(bus->attach_flags, KDBUS_ATTACH_TIMESTAMP, b); return 0; } -int sd_bus_negotiate_attach_selinux_context(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; - - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_SECLABEL, b); - return 0; -} +_public_ int sd_bus_negotiate_attach_creds(sd_bus *bus, uint64_t mask) { + assert_return(bus, -EINVAL); + assert_return(mask <= _SD_BUS_CREDS_MAX, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); -int sd_bus_negotiate_attach_audit(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; + /* The well knowns we need unconditionally, so that matches can work */ + bus->creds_mask = mask | SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME; - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_AUDIT, b); - return 0; + return kdbus_translate_attach_flags(bus->creds_mask, &bus->creds_mask); } -int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) { - if (!bus) - return -EINVAL; - if (!b && !sd_id128_equal(server_id, SD_ID128_NULL)) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) { + assert_return(bus, -EINVAL); + assert_return(b || sd_id128_equal(server_id, SD_ID128_NULL), -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); bus->is_server = !!b; bus->server_id = server_id; return 0; } -int sd_bus_set_anonymous(sd_bus *bus, int b) { - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_set_anonymous(sd_bus *bus, int b) { + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); bus->anonymous_auth = !!b; return 0; } -static int hello_callback(sd_bus *bus, sd_bus_message *reply, void *userdata) { +static int hello_callback(sd_bus *bus, sd_bus_message *reply, void *userdata, sd_bus_error *error) { const char *s; int r; assert(bus); - assert(bus->state == BUS_HELLO); + assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING); assert(reply); - r = bus_message_to_errno(reply); + r = sd_bus_message_get_errno(reply); if (r < 0) return r; + if (r > 0) + return -r; r = sd_bus_message_read(reply, "s", &s); if (r < 0) @@ -413,7 +342,8 @@ static int hello_callback(sd_bus *bus, sd_bus_message *reply, void *userdata) { if (!bus->unique_name) return -ENOMEM; - bus->state = BUS_RUNNING; + if (bus->state == BUS_HELLO) + bus->state = BUS_RUNNING; return 1; } @@ -437,7 +367,7 @@ static int bus_send_hello(sd_bus *bus) { if (r < 0) return r; - return sd_bus_send_with_reply(bus, m, hello_callback, NULL, 0, &bus->hello_serial); + return sd_bus_call_async(bus, m, hello_callback, NULL, 0, &bus->hello_serial); } int bus_start_running(sd_bus *bus) { @@ -796,6 +726,45 @@ static int parse_kernel_address(sd_bus *b, const char **p, char **guid) { return 0; } +static int parse_container_address(sd_bus *b, const char **p, char **guid) { + _cleanup_free_ char *machine = NULL; + int r; + + assert(b); + assert(p); + assert(*p); + assert(guid); + + while (**p != 0 && **p != ';') { + r = parse_address_key(p, "guid", guid); + if (r < 0) + return r; + else if (r > 0) + continue; + + r = parse_address_key(p, "machine", &machine); + if (r < 0) + return r; + else if (r > 0) + continue; + + skip_address_key(p); + } + + if (!machine) + return -EINVAL; + + free(b->machine); + b->machine = machine; + machine = NULL; + + b->sockaddr.un.sun_family = AF_UNIX; + strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path)); + b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/var/run/dbus/system_bus_socket") - 1; + + return 0; +} + static void bus_reset_parsed_address(sd_bus *b) { assert(b); @@ -808,6 +777,8 @@ static void bus_reset_parsed_address(sd_bus *b) { b->server_id = SD_ID128_NULL; free(b->kernel); b->kernel = NULL; + free(b->machine); + b->machine = NULL; } static int bus_parse_next_address(sd_bus *b) { @@ -866,6 +837,14 @@ static int bus_parse_next_address(sd_bus *b) { if (r < 0) return r; + break; + } else if (startswith(a, "x-container:")) { + + a += 12; + r = parse_container_address(b, &a, &guid); + if (r < 0) + return r; + break; } @@ -892,24 +871,32 @@ static int bus_start_address(sd_bus *b) { for (;;) { sd_bus_close(b); - if (b->sockaddr.sa.sa_family != AF_UNSPEC) { + if (b->exec_path) { - r = bus_socket_connect(b); + r = bus_socket_exec(b); if (r >= 0) return r; b->last_connect_error = -r; + } else if (b->kernel) { + + r = bus_kernel_connect(b); + if (r >= 0) + return r; - } else if (b->exec_path) { + b->last_connect_error = -r; - r = bus_socket_exec(b); + } else if (b->machine) { + + r = bus_container_connect(b); if (r >= 0) return r; b->last_connect_error = -r; - } else if (b->kernel) { - r = bus_kernel_connect(b); + } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) { + + r = bus_socket_connect(b); if (r >= 0) return r; @@ -966,15 +953,12 @@ static int bus_start_fd(sd_bus *b) { return bus_socket_take_fd(b); } -int sd_bus_start(sd_bus *bus) { +_public_ int sd_bus_start(sd_bus *bus) { int r; - if (!bus) - return -EINVAL; - if (bus->state != BUS_UNSET) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); bus->state = BUS_OPENING; @@ -983,7 +967,7 @@ int sd_bus_start(sd_bus *bus) { if (bus->input_fd >= 0) r = bus_start_fd(bus); - else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel) + else if (bus->address || bus->sockaddr.sa.sa_family != AF_UNSPEC || bus->exec_path || bus->kernel || bus->machine) r = bus_start_address(bus); else return -EINVAL; @@ -994,28 +978,29 @@ int sd_bus_start(sd_bus *bus) { return bus_send_hello(bus); } -int sd_bus_open_system(sd_bus **ret) { +_public_ int sd_bus_open_system(sd_bus **ret) { const char *e; sd_bus *b; int r; - if (!ret) - return -EINVAL; + assert_return(ret, -EINVAL); r = sd_bus_new(&b); if (r < 0) return r; e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS"); - if (e) { + if (e) r = sd_bus_set_address(b, e); - if (r < 0) - goto fail; - } else { - b->sockaddr.un.sun_family = AF_UNIX; - strncpy(b->sockaddr.un.sun_path, "/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path)); - b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/run/dbus/system_bus_socket") - 1; - } + else +#ifdef ENABLE_KDBUS + r = sd_bus_set_address(b, "kernel:path=/dev/kdbus/0-system/bus;unix:path=/run/dbus/system_bus_socket"); +#else + r = sd_bus_set_address(b, "unix:path=/run/dbus/system_bus_socket"); +#endif + + if (r < 0) + goto fail; b->bus_client = true; @@ -1031,14 +1016,12 @@ fail: return r; } -int sd_bus_open_user(sd_bus **ret) { +_public_ int sd_bus_open_user(sd_bus **ret) { const char *e; sd_bus *b; - size_t l; int r; - if (!ret) - return -EINVAL; + assert_return(ret, -EINVAL); r = sd_bus_new(&b); if (r < 0) @@ -1051,20 +1034,32 @@ int sd_bus_open_user(sd_bus **ret) { goto fail; } else { e = secure_getenv("XDG_RUNTIME_DIR"); - if (!e) { - r = -ENOENT; - goto fail; + if (e) { + _cleanup_free_ char *ee = NULL; + + ee = bus_address_escape(e); + if (!ee) { + r = -ENOMEM; + goto fail; + } + +#ifdef ENABLE_KDBUS + asprintf(&b->address, "kernel:path=/dev/kdbus/%lu-user/bus;unix:path=%s/bus", (unsigned long) getuid(), ee); +#else + b->address = strjoin("unix:path=", ee, "/bus", NULL); +#endif + } else { +#ifdef ENABLE_KDBUS + asprintf(&b->address, "kernel:path=/dev/kdbus/%lu-user/bus", (unsigned long) getuid()); +#else + return -ECONNREFUSED; +#endif } - l = strlen(e); - if (l + 4 > sizeof(b->sockaddr.un.sun_path)) { - r = -E2BIG; + if (!b->address) { + r = -ENOMEM; goto fail; } - - b->sockaddr.un.sun_family = AF_UNIX; - memcpy(mempcpy(b->sockaddr.un.sun_path, e, l), "/bus", 4); - b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 4; } b->bus_client = true; @@ -1081,7 +1076,80 @@ fail: return r; } -void sd_bus_close(sd_bus *bus) { +_public_ int sd_bus_open_system_remote(const char *host, sd_bus **ret) { + _cleanup_free_ char *e = NULL; + char *p = NULL; + sd_bus *bus; + int r; + + assert_return(host, -EINVAL); + assert_return(ret, -EINVAL); + + e = bus_address_escape(host); + if (!e) + return -ENOMEM; + + p = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", NULL); + if (!p) + return -ENOMEM; + + r = sd_bus_new(&bus); + if (r < 0) { + free(p); + return r; + } + + bus->address = p; + bus->bus_client = true; + + r = sd_bus_start(bus); + if (r < 0) { + bus_free(bus); + return r; + } + + *ret = bus; + return 0; +} + +_public_ int sd_bus_open_system_container(const char *machine, sd_bus **ret) { + _cleanup_free_ char *e = NULL; + sd_bus *bus; + char *p; + int r; + + assert_return(machine, -EINVAL); + assert_return(ret, -EINVAL); + + e = bus_address_escape(machine); + if (!e) + return -ENOMEM; + + p = strjoin("x-container:machine=", e, NULL); + if (!p) + return -ENOMEM; + + r = sd_bus_new(&bus); + if (r < 0) { + free(p); + return r; + } + + bus->address = p; + bus->bus_client = true; + + r = sd_bus_start(bus); + if (r < 0) { + bus_free(bus); + return r; + } + + *ret = bus; + return 0; +} + +_public_ void sd_bus_close(sd_bus *bus) { + if (!bus) return; if (bus->state == BUS_CLOSED) @@ -1091,28 +1159,43 @@ void sd_bus_close(sd_bus *bus) { bus->state = BUS_CLOSED; + sd_bus_detach_event(bus); + + /* Drop all queued messages so that they drop references to + * the bus object and the bus may be freed */ + bus_reset_queues(bus); + if (!bus->is_kernel) bus_close_fds(bus); /* We'll leave the fd open in case this is a kernel bus, since * there might still be memblocks around that reference this - * bus, and they might need to invoke the - * KDBUS_CMD_MSG_RELEASE ioctl on the fd when they are - * freed. */ + * bus, and they might need to invoke the * KDBUS_CMD_FREE + * ioctl on the fd when they are freed. */ } -sd_bus *sd_bus_ref(sd_bus *bus) { - if (!bus) - return NULL; +static void bus_enter_closing(sd_bus *bus) { + assert(bus); + + if (bus->state != BUS_OPENING && + bus->state != BUS_AUTHENTICATING && + bus->state != BUS_HELLO && + bus->state != BUS_RUNNING) + return; + + bus->state = BUS_CLOSING; +} + +_public_ sd_bus *sd_bus_ref(sd_bus *bus) { + assert_return(bus, NULL); assert_se(REFCNT_INC(bus->n_ref) >= 2); return bus; } -sd_bus *sd_bus_unref(sd_bus *bus) { - if (!bus) - return NULL; +_public_ sd_bus *sd_bus_unref(sd_bus *bus) { + assert_return(bus, NULL); if (REFCNT_DEC(bus->n_ref) <= 0) bus_free(bus); @@ -1120,24 +1203,20 @@ sd_bus *sd_bus_unref(sd_bus *bus) { return NULL; } -int sd_bus_is_open(sd_bus *bus) { - if (!bus) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_is_open(sd_bus *bus) { + + assert_return(bus, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); return BUS_IS_OPEN(bus->state); } -int sd_bus_can_send(sd_bus *bus, char type) { +_public_ int sd_bus_can_send(sd_bus *bus, char type) { int r; - if (!bus) - return -EINVAL; - if (bus->state == BUS_UNSET) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(bus->state != BUS_UNSET, -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); if (type == SD_BUS_TYPE_UNIX_FD) { if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) @@ -1153,15 +1232,12 @@ int sd_bus_can_send(sd_bus *bus, char type) { return bus_type_is_valid(type); } -int sd_bus_get_server_id(sd_bus *bus, sd_id128_t *server_id) { +_public_ int sd_bus_get_server_id(sd_bus *bus, sd_id128_t *server_id) { int r; - if (!bus) - return -EINVAL; - if (!server_id) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(server_id, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); r = bus_ensure_running(bus); if (r < 0) @@ -1172,17 +1248,55 @@ int sd_bus_get_server_id(sd_bus *bus, sd_id128_t *server_id) { } static int bus_seal_message(sd_bus *b, sd_bus_message *m) { + assert(b); assert(m); if (m->header->version > b->message_version) return -EPERM; - if (m->sealed) + if (m->sealed) { + /* If we copy the same message to multiple + * destinations, avoid using the same serial + * numbers. */ + b->serial = MAX(b->serial, BUS_MESSAGE_SERIAL(m)); return 0; + } return bus_message_seal(m, ++b->serial); } +int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) { + assert(b); + assert(m); + + if (m->header->version > b->message_version) + return -EPERM; + + /* The bus specification says the serial number cannot be 0, + * hence let's fill something in for synthetic messages. Since + * synthetic messages might have a fake sender and we don't + * want to interfere with the real sender's serial numbers we + * pick a fixed, artifical one. We use (uint32_t) -1 rather + * than (uint64_t) -1 since dbus1 only had 32bit identifiers, + * even though kdbus can do 64bit. */ + + return bus_message_seal(m, 0xFFFFFFFFULL); +} + +static int bus_write_message(sd_bus *bus, sd_bus_message *message, size_t *idx) { + int r; + + assert(bus); + assert(message); + + if (bus->is_kernel) + return bus_kernel_write_message(bus, message); + else + return bus_socket_write_message(bus, message, idx); + + return r; +} + static int dispatch_wqueue(sd_bus *bus) { int r, ret = 0; @@ -1191,15 +1305,10 @@ static int dispatch_wqueue(sd_bus *bus) { while (bus->wqueue_size > 0) { - if (bus->is_kernel) - r = bus_kernel_write_message(bus, bus->wqueue[0]); - else - r = bus_socket_write_message(bus, bus->wqueue[0], &bus->windex); - - if (r < 0) { - sd_bus_close(bus); + r = bus_write_message(bus, bus->wqueue[0], &bus->windex); + if (r < 0) return r; - } else if (r == 0) + else if (r == 0) /* Didn't do anything this time */ return ret; else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) { @@ -1225,55 +1334,72 @@ static int dispatch_wqueue(sd_bus *bus) { return ret; } +static int bus_read_message(sd_bus *bus) { + assert(bus); + + if (bus->is_kernel) + return bus_kernel_read_message(bus); + else + return bus_socket_read_message(bus); +} + +int bus_rqueue_make_room(sd_bus *bus) { + sd_bus_message **q; + unsigned x; + + x = bus->rqueue_size + 1; + + if (bus->rqueue_allocated >= x) + return 0; + + if (x > BUS_RQUEUE_MAX) + return -ENOBUFS; + + q = realloc(bus->rqueue, x * sizeof(sd_bus_message*)); + if (!q) + return -ENOMEM; + + bus->rqueue = q; + bus->rqueue_allocated = x; + + return 0; +} + static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) { - sd_bus_message *z = NULL; int r, ret = 0; assert(bus); assert(m); assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); - if (bus->rqueue_size > 0) { - /* Dispatch a queued message */ - - *m = bus->rqueue[0]; - bus->rqueue_size --; - memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size); - return 1; - } + for (;;) { + if (bus->rqueue_size > 0) { + /* Dispatch a queued message */ - /* Try to read a new message */ - do { - if (bus->is_kernel) - r = bus_kernel_read_message(bus, &z); - else - r = bus_socket_read_message(bus, &z); + *m = bus->rqueue[0]; + bus->rqueue_size --; + memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size); + return 1; + } - if (r < 0) { - sd_bus_close(bus); + /* Try to read a new message */ + r = bus_read_message(bus); + if (r < 0) return r; - } if (r == 0) return ret; ret = 1; - } while (!z); - - *m = z; - return ret; + } } -int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { +_public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { int r; - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (!m) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); if (m->n_fds > 0) { r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD); @@ -1295,18 +1421,16 @@ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { /* If this is a reply and no reply was requested, then let's * suppress this, if we can */ if (m->dont_send && !serial) - return 0; + return 1; if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) { size_t idx = 0; - if (bus->is_kernel) - r = bus_kernel_write_message(bus, m); - else - r = bus_socket_write_message(bus, m, &idx); - + r = bus_write_message(bus, m, &idx); if (r < 0) { - sd_bus_close(bus); + if (r == -EPIPE || r == -ENOTCONN || r == -ESHUTDOWN) + bus_enter_closing(bus); + return r; } else if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) { /* Wasn't fully written. So let's remember how @@ -1337,7 +1461,28 @@ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { if (serial) *serial = BUS_MESSAGE_SERIAL(m); - return 0; + return 1; +} + +_public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *serial) { + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + if (!streq_ptr(m->destination, destination)) { + + if (!destination) + return -EEXIST; + + r = sd_bus_message_set_destination(m, destination); + if (r < 0) + return r; + } + + return sd_bus_send(bus, m, serial); } static usec_t calc_elapse(uint64_t usec) { @@ -1368,7 +1513,7 @@ static int timeout_compare(const void *a, const void *b) { return 0; } -int sd_bus_send_with_reply( +_public_ int sd_bus_call_async( sd_bus *bus, sd_bus_message *m, sd_bus_message_handler_t callback, @@ -1379,20 +1524,13 @@ int sd_bus_send_with_reply( struct reply_callback *c; int r; - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (!m) - return -EINVAL; - if (!callback) - return -EINVAL; - if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) - return -EINVAL; - if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); + assert_return(callback, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func); if (r < 0) @@ -1427,29 +1565,26 @@ int sd_bus_send_with_reply( r = prioq_put(bus->reply_callbacks_prioq, c, &c->prioq_idx); if (r < 0) { c->timeout = 0; - sd_bus_send_with_reply_cancel(bus, c->serial); + sd_bus_call_async_cancel(bus, c->serial); return r; } } r = sd_bus_send(bus, m, serial); if (r < 0) { - sd_bus_send_with_reply_cancel(bus, c->serial); + sd_bus_call_async_cancel(bus, c->serial); return r; } return r; } -int sd_bus_send_with_reply_cancel(sd_bus *bus, uint64_t serial) { +_public_ int sd_bus_call_async_cancel(sd_bus *bus, uint64_t serial) { struct reply_callback *c; - if (!bus) - return -EINVAL; - if (serial == 0) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(serial != 0, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); c = hashmap_remove(bus->reply_callbacks, &serial); if (!c) @@ -1467,7 +1602,7 @@ int bus_ensure_running(sd_bus *bus) { assert(bus); - if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED) + if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING) return -ENOTCONN; if (bus->state == BUS_RUNNING) return 1; @@ -1487,37 +1622,32 @@ int bus_ensure_running(sd_bus *bus) { } } -int sd_bus_send_with_reply_and_block( +_public_ int sd_bus_call( sd_bus *bus, sd_bus_message *m, uint64_t usec, sd_bus_error *error, sd_bus_message **reply) { - int r; usec_t timeout; uint64_t serial; - bool room = false; + unsigned i; + int r; - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (!m) - return -EINVAL; - if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) - return -EINVAL; - if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) - return -EINVAL; - if (bus_error_is_dirty(error)) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); + assert_return(!bus_error_is_dirty(error), -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); r = bus_ensure_running(bus); if (r < 0) return r; + i = bus->rqueue_size; + r = sd_bus_send(bus, m, &serial); if (r < 0) return r; @@ -1526,73 +1656,63 @@ int sd_bus_send_with_reply_and_block( for (;;) { usec_t left; - sd_bus_message *incoming = NULL; - - if (!room) { - sd_bus_message **q; - - if (bus->rqueue_size >= BUS_RQUEUE_MAX) - return -ENOBUFS; - /* Make sure there's room for queuing this - * locally, before we read the message */ + while (i < bus->rqueue_size) { + sd_bus_message *incoming = NULL; - q = realloc(bus->rqueue, (bus->rqueue_size + 1) * sizeof(sd_bus_message*)); - if (!q) - return -ENOMEM; - - bus->rqueue = q; - room = true; - } - - if (bus->is_kernel) - r = bus_kernel_read_message(bus, &incoming); - else - r = bus_socket_read_message(bus, &incoming); - if (r < 0) - return r; - if (incoming) { + incoming = bus->rqueue[i]; if (incoming->reply_serial == serial) { /* Found a match! */ - if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN) { + memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1)); + bus->rqueue_size--; + + if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) { if (reply) *reply = incoming; else sd_bus_message_unref(incoming); - return 0; - } + return 1; + } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) + r = sd_bus_error_copy(error, &incoming->error); + else + r = -EIO; - if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) { - int k; + sd_bus_message_unref(incoming); + return r; - r = sd_bus_error_copy(error, &incoming->error); - if (r < 0) { - sd_bus_message_unref(incoming); - return r; - } + } else if (incoming->header->serial == serial && + bus->unique_name && + incoming->sender && + streq(bus->unique_name, incoming->sender)) { - k = bus_error_to_errno(&incoming->error); - sd_bus_message_unref(incoming); - return k; - } + memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1)); + bus->rqueue_size--; + + /* Our own message? Somebody is trying + * to send its own client a message, + * let's not dead-lock, let's fail + * immediately. */ sd_bus_message_unref(incoming); - return -EIO; + return -ELOOP; } - /* There's already guaranteed to be room for - * this, so need to resize things here */ - bus->rqueue[bus->rqueue_size ++] = incoming; - room = false; - /* Try to read more, right-away */ - continue; + i++; } - if (r != 0) + + r = bus_read_message(bus); + if (r < 0) { + if (r == -EPIPE || r == -ENOTCONN || r == -ESHUTDOWN) + bus_enter_closing(bus); + + return r; + } + if (r > 0) continue; if (timeout > 0) { @@ -1611,33 +1731,30 @@ int sd_bus_send_with_reply_and_block( return r; r = dispatch_wqueue(bus); - if (r < 0) + if (r < 0) { + if (r == -EPIPE || r == -ENOTCONN || r == -ESHUTDOWN) + bus_enter_closing(bus); + return r; + } } } -int sd_bus_get_fd(sd_bus *bus) { - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus->input_fd != bus->output_fd) - return -EPERM; - if (bus_pid_changed(bus)) - return -ECHILD; +_public_ int sd_bus_get_fd(sd_bus *bus) { + + assert_return(bus, -EINVAL); + assert_return(bus->input_fd == bus->output_fd, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); return bus->input_fd; } -int sd_bus_get_events(sd_bus *bus) { +_public_ int sd_bus_get_events(sd_bus *bus) { int flags = 0; - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state) || bus->state == BUS_CLOSING, -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); if (bus->state == BUS_OPENING) flags |= POLLOUT; @@ -1658,17 +1775,18 @@ int sd_bus_get_events(sd_bus *bus) { return flags; } -int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { +_public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { struct reply_callback *c; - if (!bus) - return -EINVAL; - if (!timeout_usec) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(timeout_usec, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state) || bus->state == BUS_CLOSING, -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + if (bus->state == BUS_CLOSING) { + *timeout_usec = 0; + return 1; + } if (bus->state == BUS_AUTHENTICATING) { *timeout_usec = bus->auth_timeout; @@ -1680,6 +1798,11 @@ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { return 0; } + if (bus->rqueue_size > 0) { + *timeout_usec = 0; + return 1; + } + c = prioq_peek(bus->reply_callbacks_prioq); if (!c) { *timeout_usec = (uint64_t) -1; @@ -1691,6 +1814,7 @@ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { } static int process_timeout(sd_bus *bus) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; _cleanup_bus_message_unref_ sd_bus_message* m = NULL; struct reply_callback *c; usec_t n; @@ -1709,18 +1833,30 @@ static int process_timeout(sd_bus *bus) { r = bus_message_new_synthetic_error( bus, c->serial, - &SD_BUS_ERROR_MAKE("org.freedesktop.DBus.Error.Timeout", "Timed out"), + &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"), &m); if (r < 0) return r; + m->sender = "org.freedesktop.DBus"; + + r = bus_seal_synthetic_message(bus, m); + if (r < 0) + return r; + assert_se(prioq_pop(bus->reply_callbacks_prioq) == c); hashmap_remove(bus->reply_callbacks, &c->serial); - r = c->callback(bus, m, c->userdata); + bus->current = m; + bus->iteration_counter ++; + + r = c->callback(bus, m, c->userdata, &error_buffer); + r = bus_maybe_reply_error(m, r, &error_buffer); free(c); - return r < 0 ? r : 1; + bus->current = NULL; + + return r; } static int process_hello(sd_bus *bus, sd_bus_message *m) { @@ -1735,8 +1871,8 @@ static int process_hello(sd_bus *bus, sd_bus_message *m) { * here (we leave that to the usual handling), we just verify * we don't let any earlier msg through. */ - if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_RETURN && - m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR) + if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN && + m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) return -EIO; if (m->reply_serial != bus->hello_serial) @@ -1746,14 +1882,15 @@ static int process_hello(sd_bus *bus, sd_bus_message *m) { } static int process_reply(sd_bus *bus, sd_bus_message *m) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; struct reply_callback *c; int r; assert(bus); assert(m); - if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_RETURN && - m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR) + if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN && + m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) return 0; c = hashmap_remove(bus->reply_callbacks, &m->reply_serial); @@ -1767,13 +1904,15 @@ static int process_reply(sd_bus *bus, sd_bus_message *m) { if (r < 0) return r; - r = c->callback(bus, m, c->userdata); + r = c->callback(bus, m, c->userdata, &error_buffer); + r = bus_maybe_reply_error(m, r, &error_buffer); free(c); return r; } static int process_filter(sd_bus *bus, sd_bus_message *m) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; struct filter_callback *l; int r; @@ -1798,7 +1937,8 @@ static int process_filter(sd_bus *bus, sd_bus_message *m) { if (r < 0) return r; - r = l->callback(bus, m, l->userdata); + r = l->callback(bus, m, l->userdata, &error_buffer); + r = bus_maybe_reply_error(m, r, &error_buffer); if (r != 0) return r; @@ -1834,7 +1974,7 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { assert(bus); assert(m); - if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) + if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL) return 0; if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer")) @@ -1844,7 +1984,7 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { return 1; if (streq_ptr(m->member, "Ping")) - r = sd_bus_message_new_method_return(bus, m, &reply); + r = sd_bus_message_new_method_return(m, &reply); else if (streq_ptr(m->member, "GetMachineId")) { sd_id128_t id; char sid[33]; @@ -1853,15 +1993,15 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { if (r < 0) return r; - r = sd_bus_message_new_method_return(bus, m, &reply); + r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return r; r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid)); } else { r = sd_bus_message_new_method_errorf( - bus, m, &reply, - "org.freedesktop.DBus.Error.UnknownMethod", + m, &reply, + SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method '%s' on interface '%s'.", m->member, m->interface); } @@ -1875,2412 +2015,827 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { return 1; } -static int node_vtable_get_userdata( - sd_bus *bus, - const char *path, - struct node_vtable *c, - void **userdata) { - - void *u; +static int process_message(sd_bus *bus, sd_bus_message *m) { int r; assert(bus); - assert(path); - assert(c); - - u = c->userdata; - if (c->find) { - r = c->find(bus, path, c->interface, &u, u); - if (r <= 0) - return r; - } + assert(m); - if (userdata) - *userdata = u; + bus->current = m; + bus->iteration_counter++; - return 1; -} + log_debug("Got message sender=%s object=%s interface=%s member=%s", + strna(sd_bus_message_get_sender(m)), + strna(sd_bus_message_get_path(m)), + strna(sd_bus_message_get_interface(m)), + strna(sd_bus_message_get_member(m))); -static void *vtable_property_convert_userdata(const sd_bus_vtable *p, void *u) { - assert(p); + r = process_hello(bus, m); + if (r != 0) + goto finish; - return (uint8_t*) u + p->property.offset; -} + r = process_reply(bus, m); + if (r != 0) + goto finish; -static int vtable_property_get_userdata( - sd_bus *bus, - const char *path, - struct vtable_member *p, - void **userdata) { + r = process_filter(bus, m); + if (r != 0) + goto finish; - void *u; - int r; + r = process_match(bus, m); + if (r != 0) + goto finish; - assert(bus); - assert(path); - assert(p); - assert(userdata); + r = process_builtin(bus, m); + if (r != 0) + goto finish; - r = node_vtable_get_userdata(bus, path, p->parent, &u); - if (r <= 0) - return r; + r = bus_process_object(bus, m); - *userdata = vtable_property_convert_userdata(p->vtable, u); - return 1; +finish: + bus->current = NULL; + return r; } -static int add_enumerated_to_set(sd_bus *bus, const char *prefix, struct node_enumerator *first, Set *s) { - struct node_enumerator *c; +static int process_running(sd_bus *bus, sd_bus_message **ret) { + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; int r; assert(bus); - assert(prefix); - assert(s); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + r = process_timeout(bus); + if (r != 0) + goto null_message; - LIST_FOREACH(enumerators, c, first) { - char **children = NULL, **k; + r = dispatch_wqueue(bus); + if (r != 0) + goto null_message; + + r = dispatch_rqueue(bus, &m); + if (r < 0) + return r; + if (!m) + goto null_message; + + r = process_message(bus, m); + if (r != 0) + goto null_message; - r = c->callback(bus, prefix, &children, c->userdata); + if (ret) { + r = sd_bus_message_rewind(m, true); if (r < 0) return r; - STRV_FOREACH(k, children) { - if (r < 0) { - free(*k); - continue; - } - - if (!object_path_is_valid(*k) && object_path_startswith(*k, prefix)) { - free(*k); - r = -EINVAL; - continue; - } + *ret = m; + m = NULL; + return 1; + } - r = set_consume(s, *k); - } + if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) { - free(children); + r = sd_bus_reply_method_errorf( + m, + SD_BUS_ERROR_UNKNOWN_OBJECT, + "Unknown object '%s'.", m->path); if (r < 0) return r; } - return 0; + return 1; + +null_message: + if (r >= 0 && ret) + *ret = NULL; + + return r; } -static int add_subtree_to_set(sd_bus *bus, const char *prefix, struct node *n, Set *s) { - struct node *i; +static int process_closing(sd_bus *bus, sd_bus_message **ret) { + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + struct reply_callback *c; int r; assert(bus); - assert(prefix); - assert(n); - assert(s); - - r = add_enumerated_to_set(bus, prefix, n->enumerators, s); - if (r < 0) - return r; + assert(bus->state == BUS_CLOSING); - LIST_FOREACH(siblings, i, n->child) { - char *t; - - t = strdup(i->path); - if (!t) - return -ENOMEM; + c = hashmap_first(bus->reply_callbacks); + if (c) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; - r = set_consume(s, t); - if (r < 0 && r != -EEXIST) + /* First, fail all outstanding method calls */ + r = bus_message_new_synthetic_error( + bus, + c->serial, + &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"), + &m); + if (r < 0) return r; - r = add_subtree_to_set(bus, prefix, i, s); + r = bus_seal_synthetic_message(bus, m); if (r < 0) return r; - } - return 0; -} + if (c->timeout != 0) + prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); -static int get_child_nodes(sd_bus *bus, const char *prefix, struct node *n, Set **_s) { - Set *s = NULL; - int r; + hashmap_remove(bus->reply_callbacks, &c->serial); - assert(bus); - assert(n); - assert(_s); + bus->current = m; + bus->iteration_counter++; - s = set_new(string_hash_func, string_compare_func); - if (!s) - return -ENOMEM; + r = c->callback(bus, m, c->userdata, &error_buffer); + r = bus_maybe_reply_error(m, r, &error_buffer); + free(c); - r = add_subtree_to_set(bus, prefix, n, s); - if (r < 0) { - set_free_free(s); - return r; + goto finish; } - *_s = s; - return 0; -} - -static int node_callbacks_run( - sd_bus *bus, - sd_bus_message *m, - struct node_callback *first, - bool require_fallback, - bool *found_object) { + /* Then, synthesize a Disconnected message */ + r = sd_bus_message_new_signal( + bus, + "/org/freedesktop/DBus/Local", + "org.freedesktop.DBus.Local", + "Disconnected", + &m); + if (r < 0) + return r; - struct node_callback *c; - int r; + m->sender = "org.freedesktop.DBus.Local"; - assert(bus); - assert(m); - assert(found_object); + r = bus_seal_synthetic_message(bus, m); + if (r < 0) + return r; - LIST_FOREACH(callbacks, c, first) { - if (require_fallback && !c->is_fallback) - continue; + sd_bus_close(bus); - *found_object = true; + bus->current = m; + bus->iteration_counter++; - if (c->last_iteration == bus->iteration_counter) - continue; + r = process_filter(bus, m); + if (r != 0) + goto finish; - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; + r = process_match(bus, m); + if (r != 0) + goto finish; - r = c->callback(bus, m, c->userdata); - if (r != 0) - return r; + if (ret) { + *ret = m; + m = NULL; } - return 0; -} + r = 1; -static int method_callbacks_run( - sd_bus *bus, - sd_bus_message *m, - struct vtable_member *c, - bool require_fallback, - bool *found_object) { +finish: + bus->current = NULL; + return r; +} - const char *signature; - void *u; +_public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { + BUS_DONT_DESTROY(bus); int r; - assert(bus); - assert(m); - assert(c); - assert(found_object); + /* Returns 0 when we didn't do anything. This should cause the + * caller to invoke sd_bus_wait() before returning the next + * time. Returns > 0 when we did something, which possibly + * means *ret is filled in with an unprocessed message. */ - if (require_fallback && !c->parent->is_fallback) - return 0; + assert_return(bus, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); - r = node_vtable_get_userdata(bus, m->path, c->parent, &u); - if (r <= 0) - return r; + /* We don't allow recursively invoking sd_bus_process(). */ + assert_return(!bus->current, -EBUSY); - *found_object = true; + switch (bus->state) { - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; + case BUS_UNSET: + case BUS_CLOSED: + return -ENOTCONN; - r = sd_bus_message_get_signature(m, true, &signature); - if (r < 0) + case BUS_OPENING: + r = bus_socket_process_opening(bus); + if (r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + r = 1; + } else if (r < 0) + return r; + if (ret) + *ret = NULL; return r; - if (!streq(c->vtable->method.signature, signature)) { - r = sd_bus_reply_method_errorf(bus, m, - "org.freedesktop.DBus.Error.InvalidArgs", - "Invalid arguments '%s' to call %s:%s, expecting '%s'.", - signature, c->interface, c->member, c->vtable->method.signature); - if (r < 0) + case BUS_AUTHENTICATING: + r = bus_socket_process_authenticating(bus); + if (r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + r = 1; + } else if (r < 0) return r; - return 1; - } - - return c->vtable->method.handler(bus, m, u); -} - -static int property_get_set_callbacks_run( - sd_bus *bus, - sd_bus_message *m, - struct vtable_member *c, - bool require_fallback, - bool is_get, - bool *found_object) { + if (ret) + *ret = NULL; - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - void *u; - int r; + return r; - assert(bus); - assert(m); - assert(found_object); + case BUS_RUNNING: + case BUS_HELLO: + r = process_running(bus, ret); + if (r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + r = 1; - if (require_fallback && !c->parent->is_fallback) - return 0; + if (ret) + *ret = NULL; + } - r = vtable_property_get_userdata(bus, m->path, c, &u); - if (r <= 0) return r; - *found_object = true; + case BUS_CLOSING: + return process_closing(bus, ret); + } - r = sd_bus_message_new_method_return(bus, m, &reply); - if (r < 0) - return r; + assert_not_reached("Unknown state"); +} - c->last_iteration = bus->iteration_counter; +static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { + struct pollfd p[2] = {}; + int r, e, n; + struct timespec ts; + usec_t m = (usec_t) -1; - if (is_get) { - r = sd_bus_message_open_container(reply, 'v', c->vtable->property.signature); - if (r < 0) - return r; + assert(bus); - if (c->vtable->property.get) { - r = c->vtable->property.get(bus, m->path, c->interface, c->member, reply, &error, u); - if (r < 0) - return r; - } else - assert_not_reached("automatic properties not supported yet"); + if (bus->state == BUS_CLOSING) + return 1; - if (sd_bus_error_is_set(&error)) { - r = sd_bus_reply_method_error(bus, m, &error); - if (r < 0) - return r; + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); - return 1; - } + e = sd_bus_get_events(bus); + if (e < 0) + return e; + + if (need_more) + /* The caller really needs some more data, he doesn't + * care about what's already read, or any timeouts + * except its own.*/ + e |= POLLIN; + else { + usec_t until; + /* The caller wants to process if there's something to + * process, but doesn't care otherwise */ - r = sd_bus_message_close_container(reply); + r = sd_bus_get_timeout(bus, &until); if (r < 0) return r; - - } else { - if (c->vtable->type != _SD_BUS_VTABLE_WRITABLE_PROPERTY) - sd_bus_error_setf(&error, "org.freedesktop.DBus.Error.PropertyReadOnly", "Property '%s' is not writable.", c->member); - else { - r = sd_bus_message_enter_container(m, 'v', c->vtable->property.signature); - if (r < 0) - return r; - - if (c->vtable->property.set) { - r = c->vtable->property.set(bus, m->path, c->interface, c->member, m, &error, u); - if (r < 0) - return r; - } else - assert_not_reached("automatic properties not supported yet"); + if (r > 0) { + usec_t nw; + nw = now(CLOCK_MONOTONIC); + m = until > nw ? until - nw : 0; } + } - if (sd_bus_error_is_set(&error)) { - r = sd_bus_reply_method_error(bus, m, &error); - if (r < 0) - return r; - - return 1; - } + if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) + m = timeout_usec; - r = sd_bus_message_exit_container(m); - if (r < 0) - return r; + p[0].fd = bus->input_fd; + if (bus->output_fd == bus->input_fd) { + p[0].events = e; + n = 1; + } else { + p[0].events = e & POLLIN; + p[1].fd = bus->output_fd; + p[1].events = e & POLLOUT; + n = 2; } - r = sd_bus_send(bus, reply, NULL); + r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); if (r < 0) - return r; + return -errno; - return 1; + return r > 0 ? 1 : 0; } -static int vtable_append_all_properties( - sd_bus *bus, - sd_bus_message *reply, - const char *path, - struct node_vtable *c, - void *userdata, - sd_bus_error *error) { - - const sd_bus_vtable *v; - int r; - - assert(bus); - assert(reply); - assert(c); - - for (v = c->vtable+1; v->type != _SD_BUS_VTABLE_END; v++) { - if (v->type != _SD_BUS_VTABLE_PROPERTY && v->type != _SD_BUS_VTABLE_WRITABLE_PROPERTY) - continue; - - r = sd_bus_message_open_container(reply, 'e', "sv"); - if (r < 0) - return r; - - r = sd_bus_message_append(reply, "s", c->interface); - if (r < 0) - return r; - - r = sd_bus_message_open_container(reply, 'v', v->property.signature); - if (r < 0) - return r; +_public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { - r = v->property.get(bus, path, c->interface, v->property.member, reply, error, vtable_property_convert_userdata(v, userdata)); - if (r < 0) - return r; + assert_return(bus, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); - if (sd_bus_error_is_set(error)) - return 0; + if (bus->state == BUS_CLOSING) + return 0; - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; + assert_return(BUS_IS_OPEN(bus->state) , -ENOTCONN); - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; - } + if (bus->rqueue_size > 0) + return 0; - return 1; + return bus_poll(bus, false, timeout_usec); } -static int property_get_all_callbacks_run( - sd_bus *bus, - sd_bus_message *m, - struct node_vtable *first, - bool require_fallback, - const char *iface, - bool *found_object) { - - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - struct node_vtable *c; - bool found_interface = false; +_public_ int sd_bus_flush(sd_bus *bus) { int r; - assert(bus); - assert(m); - assert(found_object); + assert_return(bus, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); - r = sd_bus_message_new_method_return(bus, m, &reply); - if (r < 0) - return r; + if (bus->state == BUS_CLOSING) + return 0; - r = sd_bus_message_open_container(reply, 'a', "{sv}"); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + + r = bus_ensure_running(bus); if (r < 0) return r; - LIST_FOREACH(vtables, c, first) { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - void *u; + if (bus->wqueue_size <= 0) + return 0; - if (require_fallback && !c->is_fallback) - continue; + for (;;) { + r = dispatch_wqueue(bus); + if (r < 0) { + if (r == -EPIPE || r == -ENOTCONN || r == -ESHUTDOWN) + bus_enter_closing(bus); - r = node_vtable_get_userdata(bus, m->path, c, &u); - if (r < 0) return r; - if (r == 0) - continue; - - *found_object = true; - - if (iface && !streq(c->interface, iface)) - continue; - found_interface = true; + } - c->last_iteration = bus->iteration_counter; + if (bus->wqueue_size <= 0) + return 0; - r = vtable_append_all_properties(bus, reply, m->path, c, u, &error); + r = bus_poll(bus, false, (uint64_t) -1); if (r < 0) return r; - - if (sd_bus_error_is_set(&error)) { - r = sd_bus_reply_method_error(bus, m, &error); - if (r < 0) - return r; - - return 1; - } } +} - if (!found_interface) { - r = sd_bus_reply_method_errorf( - bus, m, - "org.freedesktop.DBus.Error.UnknownInterface", - "Unknown interface '%s'.", iface); - if (r < 0) - return r; +_public_ int sd_bus_add_filter(sd_bus *bus, + sd_bus_message_handler_t callback, + void *userdata) { - return 1; - } + struct filter_callback *f; - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; + assert_return(bus, -EINVAL); + assert_return(callback, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); - r = sd_bus_send(bus, reply, NULL); - if (r < 0) - return r; + f = new0(struct filter_callback, 1); + if (!f) + return -ENOMEM; + f->callback = callback; + f->userdata = userdata; - return 1; + bus->filter_callbacks_modified = true; + LIST_PREPEND(callbacks, bus->filter_callbacks, f); + return 0; } -static bool bus_node_with_object_manager(sd_bus *bus, struct node *n) { - assert(bus); +_public_ int sd_bus_remove_filter(sd_bus *bus, + sd_bus_message_handler_t callback, + void *userdata) { + + struct filter_callback *f; - if (n->object_manager) - return true; + assert_return(bus, -EINVAL); + assert_return(callback, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); - if (n->parent) - return bus_node_with_object_manager(bus, n->parent); + LIST_FOREACH(callbacks, f, bus->filter_callbacks) { + if (f->callback == callback && f->userdata == userdata) { + bus->filter_callbacks_modified = true; + LIST_REMOVE(callbacks, bus->filter_callbacks, f); + free(f); + return 1; + } + } - return false; + return 0; } -static bool bus_node_exists(sd_bus *bus, struct node *n, const char *path, bool require_fallback) { - struct node_vtable *c; - struct node_callback *k; +_public_ int sd_bus_add_match(sd_bus *bus, + const char *match, + sd_bus_message_handler_t callback, + void *userdata) { - assert(bus); - assert(n); + struct bus_match_component *components = NULL; + unsigned n_components = 0; + uint64_t cookie = 0; + int r = 0; - /* Tests if there's anything attached directly to this node - * for the specified path */ + assert_return(bus, -EINVAL); + assert_return(match, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); - LIST_FOREACH(callbacks, k, n->callbacks) { - if (require_fallback && !k->is_fallback) - continue; + r = bus_match_parse(match, &components, &n_components); + if (r < 0) + goto finish; - return true; - } + if (bus->bus_client) { + cookie = ++bus->match_cookie; - LIST_FOREACH(vtables, c, n->vtables) { - - if (require_fallback && !c->is_fallback) - continue; - - if (node_vtable_get_userdata(bus, path, c, NULL) > 0) - return true; - } - - return !require_fallback && (n->enumerators || n->object_manager); -} - -static int process_introspect( - sd_bus *bus, - sd_bus_message *m, - struct node *n, - bool require_fallback, - bool *found_object) { - - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - _cleanup_set_free_free_ Set *s = NULL; - struct introspect intro; - struct node_vtable *c; - bool empty; - int r; - - assert(bus); - assert(m); - assert(n); - assert(found_object); - - r = get_child_nodes(bus, m->path, n, &s); - if (r < 0) - return r; - - r = introspect_begin(&intro); - if (r < 0) - return r; - - r = introspect_write_default_interfaces(&intro, bus_node_with_object_manager(bus, n)); - if (r < 0) - return r; - - empty = set_isempty(s); - - LIST_FOREACH(vtables, c, n->vtables) { - if (require_fallback && !c->is_fallback) - continue; - - r = node_vtable_get_userdata(bus, m->path, c, NULL); - if (r < 0) - return r; - if (r == 0) - continue; - - empty = false; - - r = introspect_write_interface(&intro, c->interface, c->vtable); - if (r < 0) - goto finish; - } - - if (empty) { - /* Nothing?, let's see if we exist at all, and if not - * refuse to do anything */ - r = bus_node_exists(bus, n, m->path, require_fallback); + r = bus_add_match_internal(bus, match, components, n_components, cookie); if (r < 0) - return r; - - if (r == 0) goto finish; } - *found_object = true; - - r = introspect_write_child_nodes(&intro, s, m->path); - if (r < 0) - goto finish; - - r = introspect_finish(&intro, bus, m, &reply); - if (r < 0) - goto finish; - - r = sd_bus_send(bus, reply, NULL); - if (r < 0) - goto finish; - - r = 1; - -finish: - introspect_free(&intro); - return r; -} - -static int object_manager_serialize_vtable( - sd_bus *bus, - sd_bus_message *reply, - const char *path, - struct node_vtable *c, - sd_bus_error *error) { - - void *u; - int r; - - assert(bus); - assert(reply); - assert(path); - assert(c); - assert(error); - - r = node_vtable_get_userdata(bus, path, c, &u); - if (r <= 0) - return r; - - r = sd_bus_message_open_container(reply, 'e', "sa{sv}"); - if (r < 0) - return r; - - r = sd_bus_message_append(reply, "s", c->interface); - if (r < 0) - return r; - - r = sd_bus_message_open_container(reply, 'a', "{sv}"); - if (r < 0) - return r; - - r = vtable_append_all_properties(bus, reply, path, c, u, error); - if (r < 0) - return r; - - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; - - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; - - return 0; -} - -static int object_manager_serialize_path( - sd_bus *bus, - sd_bus_message *reply, - const char *prefix, - const char *path, - bool require_fallback, - sd_bus_error *error) { - - struct node_vtable *i; - struct node *n; - int r; - - assert(bus); - assert(reply); - assert(prefix); - assert(path); - assert(error); - - n = hashmap_get(bus->nodes, prefix); - if (!n) - return 0; - - r = sd_bus_message_open_container(reply, 'e', "oa{sa{sv}}"); - if (r < 0) - return r; - - r = sd_bus_message_append(reply, "o", path); - if (r < 0) - return r; - - r = sd_bus_message_open_container(reply, 'a', "{sa{sv}}"); - if (r < 0) - return r; - - LIST_FOREACH(vtables, i, n->vtables) { - - if (require_fallback && !i->is_fallback) - continue; - - r = object_manager_serialize_vtable(bus, reply, path, i, error); - if (r < 0) - return r; - if (sd_bus_error_is_set(error)) - return 0; - } - - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; - - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; - - return 1; -} - -static int object_manager_serialize_path_and_fallbacks( - sd_bus *bus, - sd_bus_message *reply, - const char *path, - sd_bus_error *error) { - - size_t pl; - int r; - - assert(bus); - assert(reply); - assert(path); - assert(error); - - /* First, add all vtables registered for this path */ - r = object_manager_serialize_path(bus, reply, path, path, false, error); - if (r < 0) - return r; - if (sd_bus_error_is_set(error)) - return 0; - - /* Second, add fallback vtables registered for any of the prefixes */ - pl = strlen(path); - if (pl > 1) { - char p[pl + 1]; - strcpy(p, path); - - for (;;) { - char *e; - - e = strrchr(p, '/'); - if (e == p || !e) - break; - - *e = 0; - - r = object_manager_serialize_path(bus, reply, p, path, true, error); - if (r < 0) - return r; - - if (sd_bus_error_is_set(error)) - return 0; - } - } - - return 0; -} - -static int process_get_managed_objects( - sd_bus *bus, - sd_bus_message *m, - struct node *n, - bool require_fallback, - bool *found_object) { - - _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; - _cleanup_set_free_free_ Set *s = NULL; - bool empty; - int r; - - assert(bus); - assert(m); - assert(n); - assert(found_object); - - if (!bus_node_with_object_manager(bus, n)) - return 0; - - r = get_child_nodes(bus, m->path, n, &s); - if (r < 0) - return r; - - r = sd_bus_message_new_method_return(bus, m, &reply); - if (r < 0) - return r; - - r = sd_bus_message_open_container(reply, 'a', "{oa{sa{sv}}}"); - if (r < 0) - return r; - - empty = set_isempty(s); - if (empty) { - struct node_vtable *c; - - /* Hmm, so we have no children? Then let's check - * whether we exist at all, i.e. whether at least one - * vtable exists. */ - - LIST_FOREACH(vtables, c, n->vtables) { - - if (require_fallback && !c->is_fallback) - continue; - - if (r < 0) - return r; - if (r == 0) - continue; - - empty = false; - break; - } - - if (empty) - return 0; - } else { - Iterator i; - char *path; - - SET_FOREACH(path, s, i) { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - - r = object_manager_serialize_path_and_fallbacks(bus, reply, path, &error); - if (r < 0) - return -ENOMEM; - - if (sd_bus_error_is_set(&error)) { - r = sd_bus_reply_method_error(bus, m, &error); - if (r < 0) - return r; - - return 1; - } - } - } - - r = sd_bus_message_close_container(reply); - if (r < 0) - return r; - - r = sd_bus_send(bus, reply, NULL); - if (r < 0) - return r; - - return 1; -} - -static int object_find_and_run( - sd_bus *bus, - sd_bus_message *m, - const char *p, - bool require_fallback, - bool *found_object) { - - struct node *n; - struct vtable_member vtable_key, *v; - int r; - - assert(bus); - assert(m); - assert(p); - assert(found_object); - - n = hashmap_get(bus->nodes, p); - if (!n) - return 0; - - /* First, try object callbacks */ - r = node_callbacks_run(bus, m, n->callbacks, require_fallback, found_object); - if (r != 0) - return r; - - if (!m->interface || !m->member) - return 0; - - /* Then, look for a known method */ - vtable_key.path = (char*) p; - vtable_key.interface = m->interface; - vtable_key.member = m->member; - - v = hashmap_get(bus->vtable_methods, &vtable_key); - if (v) { - r = method_callbacks_run(bus, m, v, require_fallback, found_object); - if (r != 0) - return r; - } - - /* Then, look for a known property */ - if (streq(m->interface, "org.freedesktop.DBus.Properties")) { - bool get = false; - - get = streq(m->member, "Get"); - - if (get || streq(m->member, "Set")) { - - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; - - vtable_key.path = (char*) p; - - r = sd_bus_message_read(m, "ss", &vtable_key.interface, &vtable_key.member); - if (r < 0) - return r; - - v = hashmap_get(bus->vtable_properties, &vtable_key); - if (v) { - r = property_get_set_callbacks_run(bus, m, v, require_fallback, get, found_object); - if (r != 0) - return r; - } - - } else if (streq(m->member, "GetAll")) { - const char *iface; - - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; - - r = sd_bus_message_read(m, "s", &iface); - if (r < 0) - return r; - - if (iface[0] == 0) - iface = NULL; - - r = property_get_all_callbacks_run(bus, m, n->vtables, require_fallback, iface, found_object); - if (r != 0) - return r; - } - - } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) { - - r = process_introspect(bus, m, n, require_fallback, found_object); - if (r != 0) - return r; - - } else if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.ObjectManager", "GetManagedObjects")) { - - r = process_get_managed_objects(bus, m, n, require_fallback, found_object); - if (r != 0) - return r; - } - - if (!*found_object) { - r = bus_node_exists(bus, n, m->path, require_fallback); - if (r < 0) - return r; - - if (r > 0) - *found_object = true; - } - - return 0; -} - -static int process_object(sd_bus *bus, sd_bus_message *m) { - int r; - size_t pl; - bool found_object = false; - - assert(bus); - assert(m); - - if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) - return 0; - - if (!m->path) - return 0; - - if (hashmap_isempty(bus->nodes)) - return 0; - - pl = strlen(m->path); - do { - char p[pl+1]; - - bus->nodes_modified = false; - - r = object_find_and_run(bus, m, m->path, false, &found_object); - if (r != 0) - return r; - - /* Look for fallback prefixes */ - strcpy(p, m->path); - for (;;) { - char *e; - - if (streq(p, "/")) - break; - - if (bus->nodes_modified) - break; - - e = strrchr(p, '/'); - assert(e); - if (e == p) - *(e+1) = 0; - else - *e = 0; - - r = object_find_and_run(bus, m, p, true, &found_object); - if (r != 0) - return r; - } - - } while (bus->nodes_modified); - - if (!found_object) - return 0; - - if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "Get") || - sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "Set")) - r = sd_bus_reply_method_errorf( - bus, m, - "org.freedesktop.DBus.Error.UnknownProperty", - "Unknown property or interface."); - else - r = sd_bus_reply_method_errorf( - bus, m, - "org.freedesktop.DBus.Error.UnknownMethod", - "Unknown method '%s' or interface '%s'.", m->member, m->interface); - - if (r < 0) - return r; - - return 1; -} - -static int process_message(sd_bus *bus, sd_bus_message *m) { - int r; - - assert(bus); - assert(m); - - bus->iteration_counter++; - - r = process_hello(bus, m); - if (r != 0) - return r; - - r = process_reply(bus, m); - if (r != 0) - return r; - - r = process_filter(bus, m); - if (r != 0) - return r; - - r = process_match(bus, m); - if (r != 0) - return r; - - r = process_builtin(bus, m); - if (r != 0) - return r; - - return process_object(bus, m); -} - -static int process_running(sd_bus *bus, sd_bus_message **ret) { - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - assert(bus); - assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); - - r = process_timeout(bus); - if (r != 0) - goto null_message; - - r = dispatch_wqueue(bus); - if (r != 0) - goto null_message; - - r = dispatch_rqueue(bus, &m); - if (r < 0) - return r; - if (!m) - goto null_message; - - r = process_message(bus, m); - if (r != 0) - goto null_message; - - if (ret) { - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; - - *ret = m; - m = NULL; - return 1; - } - - if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL) { - - r = sd_bus_reply_method_errorf( - bus, m, - "org.freedesktop.DBus.Error.UnknownObject", - "Unknown object '%s'.", m->path); - if (r < 0) - return r; - } - - return 1; - -null_message: - if (r >= 0 && ret) - *ret = NULL; - - return r; -} - -int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { - int r; - - /* Returns 0 when we didn't do anything. This should cause the - * caller to invoke sd_bus_wait() before returning the next - * time. Returns > 0 when we did something, which possibly - * means *ret is filled in with an unprocessed message. */ - - if (!bus) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - /* We don't allow recursively invoking sd_bus_process(). */ - if (bus->processing) - return -EBUSY; - - switch (bus->state) { - - case BUS_UNSET: - case BUS_CLOSED: - return -ENOTCONN; - - case BUS_OPENING: - r = bus_socket_process_opening(bus); - if (r < 0) - return r; - if (ret) - *ret = NULL; - return r; - - case BUS_AUTHENTICATING: - - r = bus_socket_process_authenticating(bus); - if (r < 0) - return r; - if (ret) - *ret = NULL; - return r; - - case BUS_RUNNING: - case BUS_HELLO: - - bus->processing = true; - r = process_running(bus, ret); - bus->processing = false; - - return r; - } - - assert_not_reached("Unknown state"); -} - -static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { - struct pollfd p[2] = {}; - int r, e, n; - struct timespec ts; - usec_t until, m; - - assert(bus); - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - e = sd_bus_get_events(bus); - if (e < 0) - return e; - - if (need_more) - e |= POLLIN; - - r = sd_bus_get_timeout(bus, &until); - if (r < 0) - return r; - if (r == 0) - m = (uint64_t) -1; - else { - usec_t nw; - nw = now(CLOCK_MONOTONIC); - m = until > nw ? until - nw : 0; - } - - if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) - m = timeout_usec; - - p[0].fd = bus->input_fd; - if (bus->output_fd == bus->input_fd) { - p[0].events = e; - n = 1; - } else { - p[0].events = e & POLLIN; - p[1].fd = bus->output_fd; - p[1].events = e & POLLOUT; - n = 2; - } - - r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); - if (r < 0) - return -errno; - - return r > 0 ? 1 : 0; -} - -int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { - - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - - if (bus->rqueue_size > 0) - return 0; - - return bus_poll(bus, false, timeout_usec); -} - -int sd_bus_flush(sd_bus *bus) { - int r; - - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - - r = bus_ensure_running(bus); - if (r < 0) - return r; - - if (bus->wqueue_size <= 0) - return 0; - - for (;;) { - r = dispatch_wqueue(bus); - if (r < 0) - return r; - - if (bus->wqueue_size <= 0) - return 0; - - r = bus_poll(bus, false, (uint64_t) -1); - if (r < 0) - return r; - } -} - -int sd_bus_add_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { - struct filter_callback *f; - - if (!bus) - return -EINVAL; - if (!callback) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - f = new0(struct filter_callback, 1); - if (!f) - return -ENOMEM; - f->callback = callback; - f->userdata = userdata; - - bus->filter_callbacks_modified = true; - LIST_PREPEND(struct filter_callback, callbacks, bus->filter_callbacks, f); - return 0; -} - -int sd_bus_remove_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { - struct filter_callback *f; - - if (!bus) - return -EINVAL; - if (!callback) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - LIST_FOREACH(callbacks, f, bus->filter_callbacks) { - if (f->callback == callback && f->userdata == userdata) { - bus->filter_callbacks_modified = true; - LIST_REMOVE(struct filter_callback, callbacks, bus->filter_callbacks, f); - free(f); - return 1; - } - } - - return 0; -} - -static struct node *bus_node_allocate(sd_bus *bus, const char *path) { - struct node *n, *parent; - const char *e; - char *s, *p; - int r; - - assert(bus); - assert(path); - assert(path[0] == '/'); - - n = hashmap_get(bus->nodes, path); - if (n) - return n; - - r = hashmap_ensure_allocated(&bus->nodes, string_hash_func, string_compare_func); - if (r < 0) - return NULL; - - s = strdup(path); - if (!s) - return NULL; - - if (streq(path, "/")) - parent = NULL; - else { - e = strrchr(path, '/'); - assert(e); - - p = strndupa(path, MAX(1, path - e)); - - parent = bus_node_allocate(bus, p); - if (!parent) { - free(s); - return NULL; - } - } - - n = new0(struct node, 1); - if (!n) - return NULL; - - n->parent = parent; - n->path = s; - - r = hashmap_put(bus->nodes, s, n); - if (r < 0) { - free(s); - free(n); - return NULL; - } - - if (parent) - LIST_PREPEND(struct node, siblings, parent->child, n); - - return n; -} - -static void bus_node_gc(sd_bus *b, struct node *n) { - assert(b); - - if (!n) - return; - - if (n->child || - n->callbacks || - n->vtables || - n->enumerators || - n->object_manager) - return; - - assert(hashmap_remove(b->nodes, n->path) == n); - - if (n->parent) - LIST_REMOVE(struct node, siblings, n->parent->child, n); - - free(n->path); - bus_node_gc(b, n->parent); - free(n); -} - -static int bus_add_object( - sd_bus *b, - bool fallback, - const char *path, - sd_bus_message_handler_t callback, - void *userdata) { - - struct node_callback *c; - struct node *n; - int r; - - if (!b) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (!callback) - return -EINVAL; - if (bus_pid_changed(b)) - return -ECHILD; - - n = bus_node_allocate(b, path); - if (!n) - return -ENOMEM; - - c = new0(struct node_callback, 1); - if (!c) { - r = -ENOMEM; - goto fail; - } - - c->node = n; - c->callback = callback; - c->userdata = userdata; - c->is_fallback = fallback; - - LIST_PREPEND(struct node_callback, callbacks, n->callbacks, c); - return 0; - -fail: - free(c); - bus_node_gc(b, n); - return r; -} - -static int bus_remove_object( - sd_bus *bus, - bool fallback, - const char *path, - sd_bus_message_handler_t callback, - void *userdata) { - - struct node_callback *c; - struct node *n; - - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (!callback) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - n = hashmap_get(bus->nodes, path); - if (!n) - return 0; - - LIST_FOREACH(callbacks, c, n->callbacks) - if (c->callback == callback && c->userdata == userdata && c->is_fallback == fallback) - break; - if (!c) - return 0; - - LIST_REMOVE(struct node_callback, callbacks, n->callbacks, c); - free(c); - - bus_node_gc(bus, n); - - return 1; -} - -int sd_bus_add_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { - return bus_add_object(bus, false, path, callback, userdata); -} - -int sd_bus_remove_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { - return bus_remove_object(bus, false, path, callback, userdata); -} - -int sd_bus_add_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { - return bus_add_object(bus, true, prefix, callback, userdata); -} - -int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { - return bus_remove_object(bus, true, prefix, callback, userdata); -} - -int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { - struct bus_match_component *components = NULL; - unsigned n_components = 0; - uint64_t cookie = 0; - int r = 0; - - if (!bus) - return -EINVAL; - if (!match) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - r = bus_match_parse(match, &components, &n_components); - if (r < 0) - goto finish; - - if (bus->bus_client) { - cookie = ++bus->match_cookie; - - r = bus_add_match_internal(bus, match, components, n_components, cookie); - if (r < 0) - goto finish; - } - - bus->match_callbacks_modified = true; - r = bus_match_add(&bus->match_callbacks, components, n_components, callback, userdata, cookie, NULL); - if (r < 0) { - if (bus->bus_client) - bus_remove_match_internal(bus, match, cookie); - } - -finish: - bus_match_parse_free(components, n_components); - return r; -} - -int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { - struct bus_match_component *components = NULL; - unsigned n_components = 0; - int r = 0, q = 0; - uint64_t cookie = 0; - - if (!bus) - return -EINVAL; - if (!match) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - r = bus_match_parse(match, &components, &n_components); - if (r < 0) - return r; - - bus->match_callbacks_modified = true; - r = bus_match_remove(&bus->match_callbacks, components, n_components, callback, userdata, &cookie); - - if (bus->bus_client) - q = bus_remove_match_internal(bus, match, cookie); - - bus_match_parse_free(components, n_components); - - return r < 0 ? r : q; -} - -int sd_bus_emit_signal( - sd_bus *bus, - const char *path, - const char *interface, - const char *member, - const char *types, ...) { - - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - if (!bus) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - - r = sd_bus_message_new_signal(bus, path, interface, member, &m); - if (r < 0) - return r; - - if (!isempty(types)) { - va_list ap; - - va_start(ap, types); - r = bus_message_append_ap(m, types, ap); - va_end(ap); - if (r < 0) - return r; - } - - return sd_bus_send(bus, m, NULL); -} - -int sd_bus_call_method( - sd_bus *bus, - const char *destination, - const char *path, - const char *interface, - const char *member, - sd_bus_error *error, - sd_bus_message **reply, - const char *types, ...) { - - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - if (!bus) - - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - - r = sd_bus_message_new_method_call(bus, destination, path, interface, member, &m); - if (r < 0) - return r; - - if (!isempty(types)) { - va_list ap; - - va_start(ap, types); - r = bus_message_append_ap(m, types, ap); - va_end(ap); - if (r < 0) - return r; - } - - return sd_bus_send_with_reply_and_block(bus, m, 0, error, reply); -} - -int sd_bus_reply_method_return( - sd_bus *bus, - sd_bus_message *call, - const char *types, ...) { - - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - if (!bus) - return -EINVAL; - if (!call) - return -EINVAL; - if (!call->sealed) - return -EPERM; - if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - - if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) - return 0; - - r = sd_bus_message_new_method_return(bus, call, &m); - if (r < 0) - return r; - - if (!isempty(types)) { - va_list ap; - - va_start(ap, types); - r = bus_message_append_ap(m, types, ap); - va_end(ap); - if (r < 0) - return r; - } - - return sd_bus_send(bus, m, NULL); -} - -int sd_bus_reply_method_error( - sd_bus *bus, - sd_bus_message *call, - const sd_bus_error *e) { - - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - int r; - - if (!bus) - return -EINVAL; - if (!call) - return -EINVAL; - if (!call->sealed) - return -EPERM; - if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) - return -EINVAL; - if (!sd_bus_error_is_set(e)) - return -EINVAL; - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - if (bus_pid_changed(bus)) - return -ECHILD; - - if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) - return 0; - - r = sd_bus_message_new_method_error(bus, call, e, &m); - if (r < 0) - return r; - - return sd_bus_send(bus, m, NULL); -} - -int sd_bus_reply_method_errorf( - sd_bus *bus, - sd_bus_message *call, - const char *name, - const char *format, - ...) { - - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - char *n, *m; - va_list ap; - int r; - - n = strdup(name); - if (!n) - return -ENOMEM; - - if (format) { - va_start(ap, format); - r = vasprintf(&m, format, ap); - va_end(ap); - - if (r < 0) { - free(n); - return -ENOMEM; - } - } - - error.name = n; - error.message = m; - error.need_free = true; - - return sd_bus_reply_method_error(bus, call, &error); -} - -bool bus_pid_changed(sd_bus *bus) { - assert(bus); - - /* We don't support people creating a bus connection and - * keeping it around over a fork(). Let's complain. */ - - return bus->original_pid != getpid(); -} - -static void free_node_vtable(sd_bus *bus, struct node_vtable *w) { - assert(bus); - - if (!w) - return; - - if (w->interface && w->node && w->vtable) { - const sd_bus_vtable *v; - - for (v = w->vtable; v->type != _SD_BUS_VTABLE_END; w++) { - struct vtable_member *x = NULL; - - switch (v->type) { - - case _SD_BUS_VTABLE_METHOD: { - struct vtable_member key; - - key.path = w->node->path; - key.interface = w->interface; - key.member = v->method.member; - - x = hashmap_remove(bus->vtable_methods, &key); - break; - } - - case _SD_BUS_VTABLE_PROPERTY: - case _SD_BUS_VTABLE_WRITABLE_PROPERTY: { - struct vtable_member key; - - key.path = w->node->path; - key.interface = w->interface; - key.member = v->property.member; - x = hashmap_remove(bus->vtable_properties, &key); - break; - }} - - free(x); - } - } - - free(w->interface); - free(w); -} - -static unsigned vtable_member_hash_func(const void *a) { - const struct vtable_member *m = a; - - return - string_hash_func(m->path) ^ - string_hash_func(m->interface) ^ - string_hash_func(m->member); -} - -static int vtable_member_compare_func(const void *a, const void *b) { - const struct vtable_member *x = a, *y = b; - int r; - - r = strcmp(x->path, y->path); - if (r != 0) - return r; - - r = strcmp(x->interface, y->interface); - if (r != 0) - return r; - - return strcmp(x->member, y->member); -} - -static int add_object_vtable_internal( - sd_bus *bus, - const char *path, - const char *interface, - const sd_bus_vtable *vtable, - bool fallback, - sd_bus_object_find_t find, - void *userdata) { - - struct node_vtable *c = NULL, *i; - const sd_bus_vtable *v; - struct node *n; - int r; - - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (!interface_name_is_valid(interface)) - return -EINVAL; - if (!vtable || vtable[0].type != _SD_BUS_VTABLE_START || vtable[0].start.element_size != sizeof(struct sd_bus_vtable)) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - r = hashmap_ensure_allocated(&bus->vtable_methods, vtable_member_hash_func, vtable_member_compare_func); - if (r < 0) - return r; - - r = hashmap_ensure_allocated(&bus->vtable_properties, vtable_member_hash_func, vtable_member_compare_func); - if (r < 0) - return r; - - n = bus_node_allocate(bus, path); - if (!n) - return -ENOMEM; - - LIST_FOREACH(vtables, i, n->vtables) { - if (streq(i->interface, interface)) { - r = -EEXIST; - goto fail; - } - - if (i->is_fallback != fallback) { - r = -EPROTOTYPE; - goto fail; - } - } - - c = new0(struct node_vtable, 1); - if (!c) { - r = -ENOMEM; - goto fail; - } - - c->node = n; - c->is_fallback = fallback; - c->vtable = vtable; - c->userdata = userdata; - c->find = find; - - c->interface = strdup(interface); - if (!c->interface) { - r = -ENOMEM; - goto fail; - } - - for (v = c->vtable+1; v->type != _SD_BUS_VTABLE_END; v++) { - - switch (v->type) { - - case _SD_BUS_VTABLE_METHOD: { - struct vtable_member *m; - - if (!member_name_is_valid(v->method.member) || - !signature_is_valid(v->method.signature, false) || - !signature_is_valid(v->method.result, false) || - !v->method.handler || - v->flags & (SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY)) { - r = -EINVAL; - goto fail; - } - - m = new0(struct vtable_member, 1); - if (!m) { - r = -ENOMEM; - goto fail; - } - - m->parent = c; - m->path = n->path; - m->interface = c->interface; - m->member = v->method.member; - m->vtable = v; - - r = hashmap_put(bus->vtable_methods, m, m); - if (r < 0) { - free(m); - goto fail; - } - - break; - } - - case _SD_BUS_VTABLE_PROPERTY: - case _SD_BUS_VTABLE_WRITABLE_PROPERTY: { - struct vtable_member *m; - - if (!member_name_is_valid(v->property.member) || - !signature_is_single(v->property.signature, false) || - v->flags & SD_BUS_VTABLE_METHOD_NO_REPLY || - (v->flags & SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY && !(v->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE))) { - r = -EINVAL; - goto fail; - } - - - m = new0(struct vtable_member, 1); - if (!m) { - r = -ENOMEM; - goto fail; - } - - m->parent = c; - m->path = n->path; - m->interface = c->interface; - m->member = v->property.member; - m->vtable = v; - - r = hashmap_put(bus->vtable_properties, m, m); - if (r < 0) { - free(m); - goto fail; - } - - break; - } - - case _SD_BUS_VTABLE_SIGNAL: - - if (!member_name_is_valid(v->signal.member) || - !signature_is_single(v->signal.signature, false)) { - r = -EINVAL; - goto fail; - } - - break; - - default: - r = -EINVAL; - goto fail; - } - } - - LIST_PREPEND(struct node_vtable, vtables, n->vtables, c); - return 0; - -fail: - if (c) - free_node_vtable(bus, c); - - bus_node_gc(bus, n); - return 0; -} - -static int remove_object_vtable_internal( - sd_bus *bus, - const char *path, - const char *interface, - bool fallback) { - - struct node_vtable *c; - struct node *n; - - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (!interface_name_is_valid(interface)) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; - - n = hashmap_get(bus->nodes, path); - if (!n) - return 0; - - LIST_FOREACH(vtables, c, n->vtables) - if (streq(c->interface, interface) && c->is_fallback == fallback) - break; - - if (!c) - return 0; - - LIST_REMOVE(struct node_vtable, vtables, n->vtables, c); - - free_node_vtable(bus, c); - return 1; -} - -int sd_bus_add_object_vtable( - sd_bus *bus, - const char *path, - const char *interface, - const sd_bus_vtable *vtable, - void *userdata) { - - return add_object_vtable_internal(bus, path, interface, vtable, false, NULL, userdata); -} - -int sd_bus_remove_object_vtable( - sd_bus *bus, - const char *path, - const char *interface) { - - return remove_object_vtable_internal(bus, path, interface, false); -} - -int sd_bus_add_fallback_vtable( - sd_bus *bus, - const char *path, - const char *interface, - const sd_bus_vtable *vtable, - sd_bus_object_find_t find, - void *userdata) { + bus->match_callbacks_modified = true; + r = bus_match_add(&bus->match_callbacks, components, n_components, callback, userdata, cookie, NULL); + if (r < 0) { + if (bus->bus_client) + bus_remove_match_internal(bus, match, cookie); + } - return add_object_vtable_internal(bus, path, interface, vtable, true, find, userdata); +finish: + bus_match_parse_free(components, n_components); + return r; } -int sd_bus_remove_fallback_vtable( - sd_bus *bus, - const char *path, - const char *interface) { +_public_ int sd_bus_remove_match(sd_bus *bus, + const char *match, + sd_bus_message_handler_t callback, + void *userdata) { - return remove_object_vtable_internal(bus, path, interface, true); -} + struct bus_match_component *components = NULL; + unsigned n_components = 0; + int r = 0, q = 0; + uint64_t cookie = 0; -int sd_bus_add_node_enumerator( - sd_bus *bus, - const char *path, - sd_bus_node_enumerator_t callback, - void *userdata) { + assert_return(bus, -EINVAL); + assert_return(match, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); - struct node_enumerator *c; - struct node *n; - int r; + r = bus_match_parse(match, &components, &n_components); + if (r < 0) + return r; - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (!callback) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + bus->match_callbacks_modified = true; + r = bus_match_remove(&bus->match_callbacks, components, n_components, callback, userdata, &cookie); - n = bus_node_allocate(bus, path); - if (!n) - return -ENOMEM; + if (bus->bus_client) + q = bus_remove_match_internal(bus, match, cookie); - c = new0(struct node_enumerator, 1); - if (!c) { - r = -ENOMEM; - goto fail; - } + bus_match_parse_free(components, n_components); - c->node = n; - c->callback = callback; - c->userdata = userdata; + return r < 0 ? r : q; +} - LIST_PREPEND(struct node_enumerator, enumerators, n->enumerators, c); - return 0; +bool bus_pid_changed(sd_bus *bus) { + assert(bus); -fail: - free(c); - bus_node_gc(bus, n); - return r; -} + /* We don't support people creating a bus connection and + * keeping it around over a fork(). Let's complain. */ -int sd_bus_remove_node_enumerator( - sd_bus *bus, - const char *path, - sd_bus_node_enumerator_t callback, - void *userdata) { + return bus->original_pid != getpid(); +} - struct node_enumerator *c; - struct node *n; +static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { + sd_bus *bus = userdata; + int r; - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (!callback) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert(bus); - n = hashmap_get(bus->nodes, path); - if (!n) - return 0; + r = sd_bus_process(bus, NULL); + if (r < 0) + return r; - LIST_FOREACH(enumerators, c, n->enumerators) - if (c->callback == callback && c->userdata == userdata) - break; + return 1; +} - if (!c) - return 0; +static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { + sd_bus *bus = userdata; + int r; - LIST_REMOVE(struct node_enumerator, enumerators, n->enumerators, c); - free(c); + assert(bus); - bus_node_gc(bus, n); + r = sd_bus_process(bus, NULL); + if (r < 0) + return r; return 1; } -static int emit_properties_changed_on_interface( - sd_bus *bus, - const char *prefix, - const char *path, - const char *interface, - bool require_fallback, - char **names) { - - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - bool has_invalidating = false; - struct vtable_member key; - struct node_vtable *c; - struct node *n; - char **property; - void *u = NULL; - int r; +static int prepare_callback(sd_event_source *s, void *userdata) { + sd_bus *bus = userdata; + int r, e; + usec_t until; + assert(s); assert(bus); - assert(path); - assert(interface); - - n = hashmap_get(bus->nodes, prefix); - if (!n) - return 0; - LIST_FOREACH(vtables, c, n->vtables) { - if (require_fallback && !c->is_fallback) - continue; + e = sd_bus_get_events(bus); + if (e < 0) + return e; - if (streq(c->interface, interface)) - break; - } + if (bus->output_fd != bus->input_fd) { - if (!c) - return 0; + r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN); + if (r < 0) + return r; - r = node_vtable_get_userdata(bus, path, c, &u); - if (r <= 0) - return r; + r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT); + if (r < 0) + return r; + } else { + r = sd_event_source_set_io_events(bus->input_io_event_source, e); + if (r < 0) + return r; + } - r = sd_bus_message_new_signal(bus, path, "org.freedesktop.DBus.Properties", "PropertiesChanged", &m); + r = sd_bus_get_timeout(bus, &until); if (r < 0) return r; + if (r > 0) { + int j; - r = sd_bus_message_append(m, "s", interface); - if (r < 0) - return r; + j = sd_event_source_set_time(bus->time_event_source, until); + if (j < 0) + return j; + } - r = sd_bus_message_open_container(m, 'a', "{sv}"); + r = sd_event_source_set_enabled(bus->time_event_source, r > 0); if (r < 0) return r; - key.path = prefix; - key.interface = interface; + return 1; +} - STRV_FOREACH(property, names) { - _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; - struct vtable_member *v; +static int quit_callback(sd_event_source *event, void *userdata) { + sd_bus *bus = userdata; - key.member = *property; - v = hashmap_get(bus->vtable_properties, &key); - if (!v) - return -ENOENT; + assert(event); - assert(c == v->parent); + sd_bus_flush(bus); - if (!(v->vtable->flags & SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE)) - return -EDOM; - if (v->vtable->flags & SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY) { - has_invalidating = true; - continue; - } + return 1; +} - r = sd_bus_message_open_container(m, 'e', "sv"); - if (r < 0) - return r; +_public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) { + int r; - r = sd_bus_message_append(m, "s", *property); - if (r < 0) - return r; + assert_return(bus, -EINVAL); + assert_return(!bus->event, -EBUSY); - r = sd_bus_message_open_container(m, 'v', v->vtable->property.signature); - if (r < 0) - return r; + assert(!bus->input_io_event_source); + assert(!bus->output_io_event_source); + assert(!bus->time_event_source); - r = v->vtable->property.get(bus, m->path, interface, *property, m, &error, vtable_property_convert_userdata(v->vtable, u)); + if (event) + bus->event = sd_event_ref(event); + else { + r = sd_event_default(&bus->event); if (r < 0) return r; + } + + r = sd_event_add_io(bus->event, bus->input_fd, 0, io_callback, bus, &bus->input_io_event_source); + if (r < 0) + goto fail; - if (sd_bus_error_is_set(&error)) - return bus_error_to_errno(&error); + r = sd_event_source_set_priority(bus->input_io_event_source, priority); + if (r < 0) + goto fail; - r = sd_bus_message_close_container(m); + if (bus->output_fd != bus->input_fd) { + r = sd_event_add_io(bus->event, bus->output_fd, 0, io_callback, bus, &bus->output_io_event_source); if (r < 0) - return r; + goto fail; - r = sd_bus_message_close_container(m); + r = sd_event_source_set_priority(bus->output_io_event_source, priority); if (r < 0) - return r; + goto fail; } - r = sd_bus_message_close_container(m); + r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback); if (r < 0) - return r; + goto fail; - r = sd_bus_message_open_container(m, 'a', "s"); + r = sd_event_add_monotonic(bus->event, 0, 0, time_callback, bus, &bus->time_event_source); if (r < 0) - return r; + goto fail; - if (has_invalidating) { - STRV_FOREACH(property, names) { - struct vtable_member *v; + r = sd_event_source_set_priority(bus->time_event_source, priority); + if (r < 0) + goto fail; - key.member = *property; - assert_se(v = hashmap_get(bus->vtable_properties, &key)); - assert(c == v->parent); + r = sd_event_add_quit(bus->event, quit_callback, bus, &bus->quit_event_source); + if (r < 0) + goto fail; - if (!(v->vtable->flags & SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY)) - continue; + return 0; - r = sd_bus_message_append(m, "s", *property); - if (r < 0) - return r; - } +fail: + sd_bus_detach_event(bus); + return r; +} + +_public_ int sd_bus_detach_event(sd_bus *bus) { + assert_return(bus, -EINVAL); + assert_return(bus->event, -ENXIO); + + if (bus->input_io_event_source) { + sd_event_source_set_enabled(bus->input_io_event_source, SD_EVENT_OFF); + bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source); } - r = sd_bus_message_close_container(m); - if (r < 0) - return r; + if (bus->output_io_event_source) { + sd_event_source_set_enabled(bus->output_io_event_source, SD_EVENT_OFF); + bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source); + } - r = sd_bus_send(bus, m, NULL); - if (r < 0) - return r; + if (bus->time_event_source) { + sd_event_source_set_enabled(bus->time_event_source, SD_EVENT_OFF); + bus->time_event_source = sd_event_source_unref(bus->time_event_source); + } - return 1; + if (bus->quit_event_source) { + sd_event_source_set_enabled(bus->quit_event_source, SD_EVENT_OFF); + bus->quit_event_source = sd_event_source_unref(bus->quit_event_source); + } + + if (bus->event) + bus->event = sd_event_unref(bus->event); + + return 0; } -int sd_bus_emit_properties_changed_strv(sd_bus *bus, const char *path, const char *interface, char **names) { - size_t pl; - int r; +_public_ sd_event* sd_bus_get_event(sd_bus *bus) { + assert_return(bus, NULL); - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (!interface_name_is_valid(interface)) - return -EINVAL; + return bus->event; +} - r = emit_properties_changed_on_interface(bus, path, path, interface, false, names); - if (r != 0) - return r; +_public_ sd_bus_message* sd_bus_get_current(sd_bus *bus) { + assert_return(bus, NULL); - pl = strlen(path); - if (pl > 1 ) { - char p[pl+1]; + return bus->current; +} - strcpy(p, path); - for (;;) { - char *e; +static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) { + sd_bus *b = NULL; + int r; - if (streq(p, "/")) - break; + assert(bus_open); + assert(default_bus); - e = strrchr(p, '/'); - assert(e); - if (e == p) - *(e+1) = 0; - else - *e = 0; + if (!ret) + return !!*default_bus; - r = emit_properties_changed_on_interface(bus, p, path, interface, true, names); - if (r != 0) - return r; - } + if (*default_bus) { + *ret = sd_bus_ref(*default_bus); + return 0; } - return -ENOENT; -} + r = bus_open(&b); + if (r < 0) + return r; -int sd_bus_emit_properties_changed(sd_bus *bus, const char *path, const char *interface, const char *name, ...) { - _cleanup_strv_free_ char **names = NULL; - va_list ap; + b->default_bus_ptr = default_bus; + b->tid = gettid(); + *default_bus = b; - va_start(ap, name); - names = strv_new_ap(name, ap); - va_end(ap); + *ret = b; + return 1; +} - if (!names) - return -ENOMEM; +_public_ int sd_bus_default_system(sd_bus **ret) { + static __thread sd_bus *default_system_bus = NULL; - return sd_bus_emit_properties_changed_strv(bus, path, interface, names); + return bus_default(sd_bus_open_system, &default_system_bus, ret); } -int sd_bus_emit_interfaces_added(sd_bus *bus, const char *path, const char *interfaces, ...) { - return -ENOSYS; +_public_ int sd_bus_default_user(sd_bus **ret) { + static __thread sd_bus *default_user_bus = NULL; + + return bus_default(sd_bus_open_user, &default_user_bus, ret); } -int sd_bus_emit_interfaces_removed(sd_bus *bus, const char *path, const char *interfaces, ...) { - return -ENOSYS; +_public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) { + assert_return(b, -EINVAL); + assert_return(tid, -EINVAL); + assert_return(!bus_pid_changed(b), -ECHILD); + + if (b->tid != 0) { + *tid = b->tid; + return 0; + } + + if (b->event) + return sd_event_get_tid(b->event, tid); + + return -ENXIO; } -int sd_bus_get_property( - sd_bus *bus, - const char *destination, - const char *path, - const char *interface, - const char *member, - sd_bus_error *error, - sd_bus_message **reply, - const char *type) { +_public_ char *sd_bus_label_escape(const char *s) { + char *r, *t; + const char *f; - sd_bus_message *rep = NULL; - int r; + assert_return(s, NULL); - if (interface && !interface_name_is_valid(interface)) - return -EINVAL; - if (!member_name_is_valid(member)) - return -EINVAL; - if (!signature_is_single(type, false)) - return -EINVAL; - if (!reply) - return -EINVAL; + /* Escapes all chars that D-Bus' object path cannot deal + * with. Can be reversed with bus_path_unescape(). We special + * case the empty string. */ - r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &rep, "ss", strempty(interface), member); - if (r < 0) - return r; + if (*s == 0) + return strdup("_"); - r = sd_bus_message_enter_container(rep, 'v', type); - if (r < 0) { - sd_bus_message_unref(rep); - return r; + r = new(char, strlen(s)*3 + 1); + if (!r) + return NULL; + + for (f = s, t = r; *f; f++) { + + /* Escape everything that is not a-zA-Z0-9. We also + * escape 0-9 if it's the first character */ + + if (!(*f >= 'A' && *f <= 'Z') && + !(*f >= 'a' && *f <= 'z') && + !(f > s && *f >= '0' && *f <= '9')) { + *(t++) = '_'; + *(t++) = hexchar(*f >> 4); + *(t++) = hexchar(*f); + } else + *(t++) = *f; } - *reply = rep; - return 0; + *t = 0; + + return r; } -int sd_bus_set_property( - sd_bus *bus, - const char *destination, - const char *path, - const char *interface, - const char *member, - sd_bus_error *error, - const char *type, ...) { +_public_ char *sd_bus_label_unescape(const char *f) { + char *r, *t; - _cleanup_bus_message_unref_ sd_bus_message *m = NULL; - va_list ap; - int r; + assert_return(f, NULL); - if (interface && !interface_name_is_valid(interface)) - return -EINVAL; - if (!member_name_is_valid(member)) - return -EINVAL; - if (!signature_is_single(type, false)) - return -EINVAL; + /* Special case for the empty string */ + if (streq(f, "_")) + return strdup(""); - r = sd_bus_message_new_method_call(bus, destination, path, "org.freedesktop.DBus.Properties", "Set", &m); - if (r < 0) - return r; + r = new(char, strlen(f) + 1); + if (!r) + return NULL; - r = sd_bus_message_append(m, "ss", strempty(interface), member); - if (r < 0) - return r; + for (t = r; *f; f++) { - r = sd_bus_message_open_container(m, 'v', type); - if (r < 0) - return r; + if (*f == '_') { + int a, b; - va_start(ap, type); - r = bus_message_append_ap(m, type, ap); - va_end(ap); - if (r < 0) - return r; + if ((a = unhexchar(f[1])) < 0 || + (b = unhexchar(f[2])) < 0) { + /* Invalid escape code, let's take it literal then */ + *(t++) = '_'; + } else { + *(t++) = (char) ((a << 4) | b); + f += 2; + } + } else + *(t++) = *f; + } - r = sd_bus_message_close_container(m); - if (r < 0) - return r; + *t = 0; - return sd_bus_send_with_reply_and_block(bus, m, 0, error, NULL); + return r; } -int sd_bus_add_object_manager(sd_bus *bus, const char *path) { - struct node *n; +_public_ int sd_bus_get_peer_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) { + sd_bus_creds *c; + pid_t pid = 0; + int r; - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + assert_return(bus, -EINVAL); + assert_return(mask <= _SD_BUS_CREDS_MAX, -ENOTSUP); + assert_return(ret, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(!bus->is_kernel, -ENOTSUP); - n = bus_node_allocate(bus, path); - if (!n) + if (!bus->ucred_valid && !isempty(bus->label)) + return -ENODATA; + + c = bus_creds_new(); + if (!c) return -ENOMEM; - n->object_manager = true; - return 0; -} + if (bus->ucred_valid) { + pid = c->pid = bus->ucred.pid; + c->uid = bus->ucred.uid; + c->gid = bus->ucred.gid; -int sd_bus_remove_object_manager(sd_bus *bus, const char *path) { - struct node *n; + c->mask |= (SD_BUS_CREDS_UID | SD_BUS_CREDS_PID | SD_BUS_CREDS_GID) & mask; + } - if (!bus) - return -EINVAL; - if (!object_path_is_valid(path)) - return -EINVAL; - if (bus_pid_changed(bus)) - return -ECHILD; + if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) { + c->label = strdup(bus->label); + if (!c->label) { + sd_bus_creds_unref(c); + return -ENOMEM; + } - n = hashmap_get(bus->nodes, path); - if (!n) - return 0; + c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT; + } - if (!n->object_manager) - return 0; + r = bus_creds_add_more(c, mask, pid, 0); + if (r < 0) + return r; - n->object_manager = false; - bus_node_gc(bus, n); - return 1; + *ret = c; + return 0; }