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=61dc0e56a88e7e72d5ae64d80beeb04d51e754f2;hp=665f1e6c8bae11c7035eed493f168389ac0bb0a9;hb=ab9001a1e3dc6e60d0cdf53363dc5d18dcc382fd;hpb=40ca29a1370379d43e44c0ed425eecc7218dcbca diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c index 665f1e6c8..61dc0e56a 100644 --- a/src/libsystemd-bus/sd-bus.c +++ b/src/libsystemd-bus/sd-bus.c @@ -34,6 +34,7 @@ #include "strv.h" #include "set.h" #include "missing.h" +#include "def.h" #include "sd-bus.h" #include "bus-internal.h" @@ -46,12 +47,18 @@ #include "bus-signature.h" #include "bus-objects.h" #include "bus-util.h" +#include "bus-container.h" +#include "bus-protocol.h" static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec); +static int attach_io_events(sd_bus *b); +static void detach_io_events(sd_bus *b); static void bus_close_fds(sd_bus *b) { assert(b); + detach_io_events(b); + if (b->input_fd >= 0) close_nointr_nofail(b->input_fd); @@ -98,10 +105,27 @@ static void bus_node_destroy(sd_bus *b, struct node *n) { 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_allocated = b->wqueue_allocated = 0; + 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); @@ -117,6 +141,9 @@ static void bus_free(sd_bus *b) { free(b->auth_buffer); free(b->address); free(b->kernel); + free(b->machine); + free(b->fake_label); + free(b->cgroup_root); free(b->exec_path); strv_free(b->exec_argv); @@ -124,13 +151,7 @@ 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); @@ -157,7 +178,7 @@ 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; assert_return(ret, -EINVAL); @@ -169,15 +190,16 @@ 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); /* We guarantee that wqueue always has space for at least one * entry */ - r->wqueue = new(sd_bus_message*, 1); - if (!r->wqueue) { + if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) { free(r); return -ENOMEM; } @@ -186,7 +208,7 @@ 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; assert_return(bus, -EINVAL); @@ -204,7 +226,7 @@ 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) { +_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); @@ -216,7 +238,7 @@ int sd_bus_set_fd(sd_bus *bus, int input_fd, int 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; assert_return(bus, -EINVAL); @@ -244,7 +266,7 @@ 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) { +_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); @@ -253,7 +275,7 @@ int sd_bus_set_bus_client(sd_bus *bus, int b) { return 0; } -int sd_bus_negotiate_fds(sd_bus *bus, int b) { +_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); @@ -262,95 +284,62 @@ int sd_bus_negotiate_fds(sd_bus *bus, int b) { return 0; } -int sd_bus_negotiate_attach_comm(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_COMM, b); - return 0; -} - -int sd_bus_negotiate_attach_exe(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_EXE, b); - return 0; -} - -int sd_bus_negotiate_attach_cmdline(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_CMDLINE, b); - return 0; -} - -int sd_bus_negotiate_attach_cgroup(sd_bus *bus, int b) { +_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_CGROUP, b); + SET_FLAG(bus->attach_flags, KDBUS_ATTACH_TIMESTAMP, b); return 0; } -int sd_bus_negotiate_attach_caps(sd_bus *bus, int b) { +_public_ int sd_bus_negotiate_attach_creds(sd_bus *bus, uint64_t mask) { assert_return(bus, -EINVAL); + assert_return(mask <= _SD_BUS_CREDS_ALL, -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); - return 0; -} - -int sd_bus_negotiate_attach_selinux_context(sd_bus *bus, int b) { - assert_return(bus, -EINVAL); - assert_return(bus->state == BUS_UNSET, -EPERM); - assert_return(!bus_pid_changed(bus), -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_SECLABEL, b); - return 0; + return kdbus_translate_attach_flags(bus->creds_mask, &bus->creds_mask); } -int sd_bus_negotiate_attach_audit(sd_bus *bus, int b) { +_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); - SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_AUDIT, b); + bus->is_server = !!b; + bus->server_id = server_id; return 0; } -int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) { +_public_ int sd_bus_set_anonymous(sd_bus *bus, int b) { 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; + bus->anonymous_auth = !!b; return 0; } -int sd_bus_set_anonymous(sd_bus *bus, int b) { +_public_ int sd_bus_set_trusted(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; + bus->trusted = !!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 = sd_bus_message_get_errno(reply); @@ -370,7 +359,8 @@ 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; } @@ -387,14 +377,14 @@ static int bus_send_hello(sd_bus *bus) { r = sd_bus_message_new_method_call( bus, "org.freedesktop.DBus", - "/", + "/org/freedesktop/DBus", "org.freedesktop.DBus", "Hello", &m); 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_cookie); } int bus_start_running(sd_bus *bus) { @@ -410,7 +400,7 @@ int bus_start_running(sd_bus *bus) { } static int parse_address_key(const char **p, const char *key, char **value) { - size_t l, n = 0; + size_t l, n = 0, allocated = 0; const char *a; char *r = NULL; @@ -434,7 +424,7 @@ static int parse_address_key(const char **p, const char *key, char **value) { a = *p; while (*a != ';' && *a != ',' && *a != 0) { - char c, *t; + char c; if (*a == '%') { int x, y; @@ -458,13 +448,9 @@ static int parse_address_key(const char **p, const char *key, char **value) { a++; } - t = realloc(r, n + 2); - if (!t) { - free(r); + if (!GREEDY_REALLOC(r, allocated, n + 2)) return -ENOMEM; - } - r = t; r[n++] = c; } @@ -627,6 +613,7 @@ static int parse_exec_address(sd_bus *b, const char **p, char **guid) { char *path = NULL; unsigned n_argv = 0, j; char **argv = NULL; + size_t allocated = 0; int r; assert(b); @@ -660,17 +647,11 @@ static int parse_exec_address(sd_bus *b, const char **p, char **guid) { (*p) ++; if (ul >= n_argv) { - char **x; - - x = realloc(argv, sizeof(char*) * (ul + 2)); - if (!x) { + if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) { r = -ENOMEM; goto fail; } - memset(x + n_argv, 0, sizeof(char*) * (ul - n_argv + 2)); - - argv = x; n_argv = ul + 1; } @@ -753,6 +734,91 @@ static int parse_kernel_address(sd_bus *b, const char **p, char **guid) { return 0; } +static int parse_container_unix_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; + + if (!filename_is_safe(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 int parse_container_kernel_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; + + if (!filename_is_safe(machine)) + return -EINVAL; + + free(b->machine); + b->machine = machine; + machine = NULL; + + free(b->kernel); + b->kernel = strdup("/dev/kdbus/0-system/bus"); + if (!b->kernel) + return -ENOMEM; + + return 0; +} + static void bus_reset_parsed_address(sd_bus *b) { assert(b); @@ -765,6 +831,8 @@ 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) { @@ -823,6 +891,22 @@ static int bus_parse_next_address(sd_bus *b) { if (r < 0) return r; + break; + } else if (startswith(a, "x-container-unix:")) { + + a += 17; + r = parse_container_unix_address(b, &a, &guid); + if (r < 0) + return r; + + break; + } else if (startswith(a, "x-container-kernel:")) { + + a += 19; + r = parse_container_kernel_address(b, &a, &guid); + if (r < 0) + return r; + break; } @@ -847,28 +931,29 @@ static int bus_start_address(sd_bus *b) { assert(b); for (;;) { - sd_bus_close(b); - - if (b->sockaddr.sa.sa_family != AF_UNSPEC) { - - r = bus_socket_connect(b); - if (r >= 0) - return r; - - b->last_connect_error = -r; + bool skipped = false; - } else if (b->exec_path) { + bus_close_fds(b); + if (b->exec_path) r = bus_socket_exec(b); - if (r >= 0) - return r; - - b->last_connect_error = -r; - } else if (b->kernel) { - + else if (b->machine && b->kernel) + r = bus_container_connect_kernel(b); + else if (b->machine && b->sockaddr.sa.sa_family != AF_UNSPEC) + r = bus_container_connect_socket(b); + else if (b->kernel) r = bus_kernel_connect(b); - if (r >= 0) - return r; + else if (b->sockaddr.sa.sa_family != AF_UNSPEC) + r = bus_socket_connect(b); + else + skipped = true; + + if (!skipped) { + if (r >= 0) { + r = attach_io_events(b); + if (r >= 0) + return r; + } b->last_connect_error = -r; } @@ -923,7 +1008,7 @@ 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; assert_return(bus, -EINVAL); @@ -937,7 +1022,7 @@ 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; @@ -948,7 +1033,7 @@ 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; @@ -960,18 +1045,20 @@ int sd_bus_open_system(sd_bus **ret) { 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 + r = sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_PATH); + if (r < 0) + goto fail; b->bus_client = true; + /* Let's do per-method access control on the system bus. We + * need the caller's UID and capability set for that. */ + b->trusted = false; + b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS; + r = sd_bus_start(b); if (r < 0) goto fail; @@ -984,10 +1071,9 @@ 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; assert_return(ret, -EINVAL); @@ -1003,24 +1089,40 @@ 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_USER_BUS_FMT ";" UNIX_USER_BUS_FMT, (unsigned long) getuid(), ee); +#else + asprintf(&b->address, UNIX_USER_BUS_FMT, (unsigned long) getuid()); +#endif + } else { +#ifdef ENABLE_KDBUS + asprintf(&b->address, KERNEL_USER_BUS_FMT, (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; + /* We don't do any per-method access control on the user + * bus. */ + b->trusted = true; + r = sd_bus_start(b); if (r < 0) goto fail; @@ -1033,7 +1135,85 @@ 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); + assert_return(filename_is_safe(machine), -EINVAL); + + e = bus_address_escape(machine); + if (!e) + return -ENOMEM; + +#ifdef ENABLE_KDBUS + p = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL); +#else + p = strjoin("x-container-unix:machine=", e, NULL); +#endif + 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) @@ -1045,26 +1225,41 @@ void sd_bus_close(sd_bus *bus) { 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) { +_public_ sd_bus *sd_bus_unref(sd_bus *bus) { + if (!bus) return NULL; @@ -1074,7 +1269,7 @@ sd_bus *sd_bus_unref(sd_bus *bus) { return NULL; } -int sd_bus_is_open(sd_bus *bus) { +_public_ int sd_bus_is_open(sd_bus *bus) { assert_return(bus, -EINVAL); assert_return(!bus_pid_changed(bus), -ECHILD); @@ -1082,7 +1277,7 @@ int sd_bus_is_open(sd_bus *bus) { 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; assert_return(bus, -EINVAL); @@ -1103,7 +1298,7 @@ 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; assert_return(bus, -EINVAL); @@ -1118,36 +1313,93 @@ int sd_bus_get_server_id(sd_bus *bus, sd_id128_t *server_id) { return 0; } -static int bus_seal_message(sd_bus *b, sd_bus_message *m) { +static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) { + assert(b); assert(m); - if (m->header->version > b->message_version) - return -EPERM; + if (m->sealed) { + /* If we copy the same message to multiple + * destinations, avoid using the same cookie + * numbers. */ + b->cookie = MAX(b->cookie, BUS_MESSAGE_COOKIE(m)); + return 0; + } + + if (timeout == 0) + timeout = BUS_DEFAULT_TIMEOUT; + + return bus_message_seal(m, ++b->cookie, timeout); +} + +static int bus_remarshal_message(sd_bus *b, sd_bus_message **m) { + assert(b); - if (m->sealed) + /* Do packet version and endianess already match? */ + if ((b->message_version == 0 || b->message_version == (*m)->header->version) && + (b->message_endian == 0 || b->message_endian == (*m)->header->endian)) return 0; - return bus_message_seal(m, ++b->serial); + /* No? Then remarshal! */ + return bus_message_remarshal(b, m); } -static int dispatch_wqueue(sd_bus *bus) { - int r, ret = 0; +int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) { + assert(b); + assert(m); + + /* 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, 0); +} + +static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { + int r; assert(bus); - assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + assert(m); - while (bus->wqueue_size > 0) { + if (bus->is_kernel) + r = bus_kernel_write_message(bus, m); + else + r = bus_socket_write_message(bus, m, idx); - 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) + return r; - if (r < 0) { - sd_bus_close(bus); - return r; - } else if (r == 0) - /* Didn't do anything this time */ + if (bus->is_kernel || *idx >= BUS_MESSAGE_SIZE(m)) + log_debug("Sent message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%lu reply_cookie=%lu error=%s", + bus_message_type_to_string(m->header->type), + strna(sd_bus_message_get_sender(m)), + strna(sd_bus_message_get_destination(m)), + strna(sd_bus_message_get_path(m)), + strna(sd_bus_message_get_interface(m)), + strna(sd_bus_message_get_member(m)), + (unsigned long) BUS_MESSAGE_COOKIE(m), + (unsigned long) m->reply_cookie, + strna(m->error.message)); + + return r; +} + +static int dispatch_wqueue(sd_bus *bus) { + int r, ret = 0; + + assert(bus); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + while (bus->wqueue_size > 0) { + + r = bus_write_message(bus, bus->wqueue[0], &bus->windex); + if (r < 0) + return r; + 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])) { /* Fully written. Let's drop the entry from @@ -1172,45 +1424,57 @@ 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) { + assert(bus); + + if (bus->rqueue_size >= BUS_RQUEUE_MAX) + return -ENOBUFS; + + if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1)) + return -ENOMEM; + + 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 *cookie) { + _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m); int r; assert_return(bus, -EINVAL); @@ -1226,30 +1490,34 @@ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { return -ENOTSUP; } - /* If the serial number isn't kept, then we know that no reply + /* If the cookie number isn't kept, then we know that no reply * is expected */ - if (!serial && !m->sealed) - m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED; + if (!cookie && !m->sealed) + m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED; + + r = bus_seal_message(bus, m, 0); + if (r < 0) + return r; - r = bus_seal_message(bus, m); + /* Remarshall if we have to. This will possible unref the + * message and place a replacement in m */ + r = bus_remarshal_message(bus, &m); if (r < 0) return r; /* If this is a reply and no reply was requested, then let's * suppress this, if we can */ - if (m->dont_send && !serial) + if (m->dont_send && !cookie) 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 @@ -1262,34 +1530,48 @@ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { bus->windex = idx; } } else { - sd_bus_message **q; - /* Just append it to the queue. */ if (bus->wqueue_size >= BUS_WQUEUE_MAX) return -ENOBUFS; - q = realloc(bus->wqueue, sizeof(sd_bus_message*) * (bus->wqueue_size + 1)); - if (!q) + if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1)) return -ENOMEM; - bus->wqueue = q; - q[bus->wqueue_size ++] = sd_bus_message_ref(m); + bus->wqueue[bus->wqueue_size ++] = sd_bus_message_ref(m); } - if (serial) - *serial = BUS_MESSAGE_SERIAL(m); + if (cookie) + *cookie = BUS_MESSAGE_COOKIE(m); return 1; } +_public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) { + 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, cookie); +} + static usec_t calc_elapse(uint64_t usec) { if (usec == (uint64_t) -1) return 0; - if (usec == 0) - usec = BUS_DEFAULT_TIMEOUT; - return now(CLOCK_MONOTONIC) + usec; } @@ -1311,14 +1593,15 @@ 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 *_m, sd_bus_message_handler_t callback, void *userdata, uint64_t usec, - uint64_t *serial) { + uint64_t *cookie) { + _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m); struct reply_callback *c; int r; @@ -1326,7 +1609,7 @@ int sd_bus_send_with_reply( 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(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); assert_return(callback, -EINVAL); assert_return(!bus_pid_changed(bus), -ECHILD); @@ -1334,13 +1617,15 @@ int sd_bus_send_with_reply( if (r < 0) return r; - if (usec != (uint64_t) -1) { - r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare); - if (r < 0) - return r; - } + r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare); + if (r < 0) + return r; + + r = bus_seal_message(bus, m, usec); + if (r < 0) + return r; - r = bus_seal_message(bus, m); + r = bus_remarshal_message(bus, &m); if (r < 0) return r; @@ -1350,10 +1635,10 @@ int sd_bus_send_with_reply( c->callback = callback; c->userdata = userdata; - c->serial = BUS_MESSAGE_SERIAL(m); - c->timeout = calc_elapse(usec); + c->cookie = BUS_MESSAGE_COOKIE(m); + c->timeout = calc_elapse(m->timeout); - r = hashmap_put(bus->reply_callbacks, &c->serial, c); + r = hashmap_put(bus->reply_callbacks, &c->cookie, c); if (r < 0) { free(c); return r; @@ -1363,28 +1648,28 @@ 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->cookie); return r; } } - r = sd_bus_send(bus, m, serial); + r = sd_bus_send(bus, m, cookie); if (r < 0) { - sd_bus_send_with_reply_cancel(bus, c->serial); + sd_bus_call_async_cancel(bus, c->cookie); 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 cookie) { struct reply_callback *c; assert_return(bus, -EINVAL); - assert_return(serial != 0, -EINVAL); + assert_return(cookie != 0, -EINVAL); assert_return(!bus_pid_changed(bus), -ECHILD); - c = hashmap_remove(bus->reply_callbacks, &serial); + c = hashmap_remove(bus->reply_callbacks, &cookie); if (!c) return 0; @@ -1400,7 +1685,7 @@ 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; @@ -1420,23 +1705,24 @@ 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, + sd_bus_message *_m, uint64_t usec, sd_bus_error *error, sd_bus_message **reply) { - int r; + _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m); usec_t timeout; - uint64_t serial; - bool room = false; + uint64_t cookie; + unsigned i; + int r; 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(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); assert_return(!bus_error_is_dirty(error), -EINVAL); assert_return(!bus_pid_changed(bus), -ECHILD); @@ -1444,44 +1730,36 @@ int sd_bus_send_with_reply_and_block( if (r < 0) return r; - r = sd_bus_send(bus, m, &serial); + i = bus->rqueue_size; + + r = bus_seal_message(bus, m, usec); if (r < 0) return r; - timeout = calc_elapse(usec); - - for (;;) { - usec_t left; - sd_bus_message *incoming = NULL; + r = bus_remarshal_message(bus, &m); + if (r < 0) + return r; - if (!room) { - sd_bus_message **q; + r = sd_bus_send(bus, m, &cookie); + if (r < 0) + return r; - if (bus->rqueue_size >= BUS_RQUEUE_MAX) - return -ENOBUFS; + timeout = calc_elapse(m->timeout); - /* Make sure there's room for queuing this - * locally, before we read the message */ + for (;;) { + usec_t left; - q = realloc(bus->rqueue, (bus->rqueue_size + 1) * sizeof(sd_bus_message*)); - if (!q) - return -ENOMEM; + while (i < bus->rqueue_size) { + sd_bus_message *incoming = NULL; - bus->rqueue = q; - room = true; - } + incoming = bus->rqueue[i]; - 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) { - - if (incoming->reply_serial == serial) { + if (incoming->reply_cookie == cookie) { /* Found a match! */ + 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) @@ -1490,35 +1768,43 @@ int sd_bus_send_with_reply_and_block( sd_bus_message_unref(incoming); 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_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 (BUS_MESSAGE_COOKIE(incoming) == cookie && + bus->unique_name && + incoming->sender && + streq(bus->unique_name, incoming->sender)) { - k = sd_bus_error_get_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) { @@ -1535,28 +1821,33 @@ int sd_bus_send_with_reply_and_block( r = bus_poll(bus, true, left); if (r < 0) return r; + if (r == 0) + return -ETIMEDOUT; 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) { +_public_ int sd_bus_get_fd(sd_bus *bus) { assert_return(bus, -EINVAL); - assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); 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; assert_return(bus, -EINVAL); - assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(BUS_IS_OPEN(bus->state) || bus->state == BUS_CLOSING, -ENOTCONN); assert_return(!bus_pid_changed(bus), -ECHILD); if (bus->state == BUS_OPENING) @@ -1578,14 +1869,19 @@ 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; assert_return(bus, -EINVAL); assert_return(timeout_usec, -EINVAL); - assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + 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; return 1; @@ -1612,6 +1908,7 @@ 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; @@ -1629,19 +1926,31 @@ static int process_timeout(sd_bus *bus) { r = bus_message_new_synthetic_error( bus, - c->serial, - &SD_BUS_ERROR_MAKE(SD_BUS_ERROR_NO_REPLY, "Method call timed out"), + c->cookie, + &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); + hashmap_remove(bus->reply_callbacks, &c->cookie); + + bus->current = m; + bus->iteration_counter ++; - 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 < 0 ? r : 1; + bus->current = NULL; + + return r; } static int process_hello(sd_bus *bus, sd_bus_message *m) { @@ -1660,13 +1969,14 @@ static int process_hello(sd_bus *bus, sd_bus_message *m) { m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) return -EIO; - if (m->reply_serial != bus->hello_serial) + if (m->reply_cookie != bus->hello_cookie) return -EIO; return 0; } 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; @@ -1677,7 +1987,7 @@ static int process_reply(sd_bus *bus, sd_bus_message *m) { m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) return 0; - c = hashmap_remove(bus->reply_callbacks, &m->reply_serial); + c = hashmap_remove(bus->reply_callbacks, &m->reply_cookie); if (!c) return 0; @@ -1688,13 +1998,15 @@ 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; @@ -1719,7 +2031,8 @@ 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; @@ -1755,17 +2068,20 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) { assert(bus); assert(m); + if (bus->manual_peer_interface) + return 0; + if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL) return 0; if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer")) return 0; - if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) + if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) 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]; @@ -1774,14 +2090,14 @@ 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, + m, &reply, SD_BUS_ERROR_UNKNOWN_METHOD, "Unknown method '%s' on interface '%s'.", m->member, m->interface); } @@ -1802,35 +2118,45 @@ static int process_message(sd_bus *bus, sd_bus_message *m) { assert(bus); assert(m); + bus->current = m; bus->iteration_counter++; - log_debug("Got message sender=%s object=%s interface=%s member=%s", + log_debug("Got message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%lu reply_cookie=%lu error=%s", + bus_message_type_to_string(m->header->type), strna(sd_bus_message_get_sender(m)), + strna(sd_bus_message_get_destination(m)), strna(sd_bus_message_get_path(m)), strna(sd_bus_message_get_interface(m)), - strna(sd_bus_message_get_member(m))); + strna(sd_bus_message_get_member(m)), + (unsigned long) BUS_MESSAGE_COOKIE(m), + (unsigned long) m->reply_cookie, + strna(m->error.message)); r = process_hello(bus, m); if (r != 0) - return r; + goto finish; r = process_reply(bus, m); if (r != 0) - return r; + goto finish; r = process_filter(bus, m); if (r != 0) - return r; + goto finish; r = process_match(bus, m); if (r != 0) - return r; + goto finish; r = process_builtin(bus, m); if (r != 0) - return r; + goto finish; + + r = bus_process_object(bus, m); - return bus_process_object(bus, m); +finish: + bus->current = NULL; + return r; } static int process_running(sd_bus *bus, sd_bus_message **ret) { @@ -1870,8 +2196,14 @@ static int process_running(sd_bus *bus, sd_bus_message **ret) { if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) { + log_debug("Unprocessed message call 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))); + r = sd_bus_reply_method_errorf( - bus, m, + m, SD_BUS_ERROR_UNKNOWN_OBJECT, "Unknown object '%s'.", m->path); if (r < 0) @@ -1887,7 +2219,88 @@ null_message: return r; } -int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { +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(bus->state == BUS_CLOSING); + + c = hashmap_first(bus->reply_callbacks); + if (c) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; + + /* First, fail all outstanding method calls */ + r = bus_message_new_synthetic_error( + bus, + c->cookie, + &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"), + &m); + if (r < 0) + return r; + + r = bus_seal_synthetic_message(bus, m); + if (r < 0) + return r; + + if (c->timeout != 0) + prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); + + hashmap_remove(bus->reply_callbacks, &c->cookie); + + 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); + + goto finish; + } + + /* 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; + + m->sender = "org.freedesktop.DBus.Local"; + + r = bus_seal_synthetic_message(bus, m); + if (r < 0) + return r; + + sd_bus_close(bus); + + bus->current = m; + bus->iteration_counter++; + + r = process_filter(bus, m); + if (r != 0) + goto finish; + + r = process_match(bus, m); + if (r != 0) + goto finish; + + if (ret) { + *ret = m; + m = NULL; + } + + r = 1; + +finish: + bus->current = NULL; + return r; +} + +_public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { BUS_DONT_DESTROY(bus); int r; @@ -1900,39 +2313,55 @@ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { assert_return(!bus_pid_changed(bus), -ECHILD); /* We don't allow recursively invoking sd_bus_process(). */ - assert_return(!bus->processing, -EBUSY); + assert_return(!bus->current, -EBUSY); switch (bus->state) { case BUS_UNSET: - case BUS_CLOSED: return -ENOTCONN; + case BUS_CLOSED: + return -ECONNRESET; + case BUS_OPENING: r = bus_socket_process_opening(bus); - if (r < 0) + 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; case BUS_AUTHENTICATING: - r = bus_socket_process_authenticating(bus); - if (r < 0) + 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; case BUS_RUNNING: case BUS_HELLO: - - bus->processing = true; r = process_running(bus, ret); - bus->processing = false; + if (r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + r = 1; + + if (ret) + *ret = NULL; + } return r; + + case BUS_CLOSING: + return process_closing(bus, ret); } assert_not_reached("Unknown state"); @@ -1945,6 +2374,10 @@ static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { usec_t m = (usec_t) -1; assert(bus); + + if (bus->state == BUS_CLOSING) + return 1; + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); e = sd_bus_get_events(bus); @@ -1992,25 +2425,33 @@ static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { return r > 0 ? 1 : 0; } -int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { +_public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { assert_return(bus, -EINVAL); - assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); assert_return(!bus_pid_changed(bus), -ECHILD); + if (bus->state == BUS_CLOSING) + return 0; + + assert_return(BUS_IS_OPEN(bus->state) , -ENOTCONN); + if (bus->rqueue_size > 0) return 0; return bus_poll(bus, false, timeout_usec); } -int sd_bus_flush(sd_bus *bus) { +_public_ int sd_bus_flush(sd_bus *bus) { int r; assert_return(bus, -EINVAL); - assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); assert_return(!bus_pid_changed(bus), -ECHILD); + if (bus->state == BUS_CLOSING) + return 0; + + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + r = bus_ensure_running(bus); if (r < 0) return r; @@ -2020,8 +2461,12 @@ int sd_bus_flush(sd_bus *bus) { for (;;) { r = dispatch_wqueue(bus); - if (r < 0) + if (r < 0) { + if (r == -EPIPE || r == -ENOTCONN || r == -ESHUTDOWN) + bus_enter_closing(bus); + return r; + } if (bus->wqueue_size <= 0) return 0; @@ -2032,7 +2477,10 @@ int sd_bus_flush(sd_bus *bus) { } } -int sd_bus_add_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { +_public_ int sd_bus_add_filter(sd_bus *bus, + sd_bus_message_handler_t callback, + void *userdata) { + struct filter_callback *f; assert_return(bus, -EINVAL); @@ -2050,7 +2498,10 @@ int sd_bus_add_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *user return 0; } -int sd_bus_remove_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { +_public_ int sd_bus_remove_filter(sd_bus *bus, + sd_bus_message_handler_t callback, + void *userdata) { + struct filter_callback *f; assert_return(bus, -EINVAL); @@ -2069,7 +2520,11 @@ int sd_bus_remove_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *u return 0; } -int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { +_public_ 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; @@ -2103,7 +2558,11 @@ finish: return r; } -int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { +_public_ 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; @@ -2138,7 +2597,7 @@ bool bus_pid_changed(sd_bus *bus) { } static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - void *bus = userdata; + sd_bus *bus = userdata; int r; assert(bus); @@ -2151,7 +2610,7 @@ static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userd } static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { - void *bus = userdata; + sd_bus *bus = userdata; int r; assert(bus); @@ -2208,46 +2667,109 @@ static int prepare_callback(sd_event_source *s, void *userdata) { return 1; } -int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) { +static int quit_callback(sd_event_source *event, void *userdata) { + sd_bus *bus = userdata; + + assert(event); + + sd_bus_flush(bus); + + return 1; +} + +static int attach_io_events(sd_bus *bus) { int r; - assert_return(bus, -EINVAL); - assert_return(event, -EINVAL); - assert_return(!bus->event, -EBUSY); + assert(bus); - assert(!bus->input_io_event_source); - assert(!bus->output_io_event_source); - assert(!bus->time_event_source); + if (bus->input_fd < 0) + return 0; - bus->event = sd_event_ref(event); + if (!bus->event) + return 0; - r = sd_event_add_io(event, bus->input_fd, 0, io_callback, bus, &bus->input_io_event_source); - if (r < 0) - goto fail; + if (!bus->input_io_event_source) { + r = sd_event_add_io(bus->event, bus->input_fd, 0, io_callback, bus, &bus->input_io_event_source); + if (r < 0) + return r; + + r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback); + if (r < 0) + return r; + + r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority); + } else + r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd); - r = sd_event_source_set_priority(bus->input_io_event_source, priority); if (r < 0) - goto fail; + return r; if (bus->output_fd != bus->input_fd) { - r = sd_event_add_io(event, bus->output_fd, 0, io_callback, bus, &bus->output_io_event_source); + assert(bus->output_fd >= 0); + + if (!bus->output_io_event_source) { + r = sd_event_add_io(bus->event, bus->output_fd, 0, io_callback, bus, &bus->output_io_event_source); + if (r < 0) + return r; + + r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority); + } else + r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd); + if (r < 0) - goto fail; + return r; + } + + return 0; +} + +static void detach_io_events(sd_bus *bus) { + assert(bus); + + 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); + } + + 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); + } +} + +_public_ int sd_bus_attach_event(sd_bus *bus, sd_event *event, int priority) { + int r; + + assert_return(bus, -EINVAL); + assert_return(!bus->event, -EBUSY); - r = sd_event_source_set_priority(bus->output_io_event_source, priority); + assert(!bus->input_io_event_source); + assert(!bus->output_io_event_source); + assert(!bus->time_event_source); + + if (event) + bus->event = sd_event_ref(event); + else { + r = sd_event_default(&bus->event); if (r < 0) - goto fail; + return r; } - r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback); + bus->event_priority = priority; + + r = sd_event_add_monotonic(bus->event, 0, 0, time_callback, bus, &bus->time_event_source); if (r < 0) goto fail; - r = sd_event_add_monotonic(event, 0, 0, time_callback, bus, &bus->time_event_source); + r = sd_event_source_set_priority(bus->time_event_source, priority); if (r < 0) goto fail; - r = sd_event_source_set_priority(bus->time_event_source, priority); + r = sd_event_add_exit(bus->event, quit_callback, bus, &bus->quit_event_source); + if (r < 0) + goto fail; + + r = attach_io_events(bus); if (r < 0) goto fail; @@ -2258,21 +2780,232 @@ fail: return r; } -int sd_bus_detach_event(sd_bus *bus) { +_public_ int sd_bus_detach_event(sd_bus *bus) { assert_return(bus, -EINVAL); - assert_return(bus->event, -ENXIO); - if (bus->input_io_event_source) - bus->input_io_event_source = sd_event_source_unref(bus->input_io_event_source); + if (!bus->event) + return 0; - if (bus->output_io_event_source) - bus->output_io_event_source = sd_event_source_unref(bus->output_io_event_source); + detach_io_events(bus); - if (bus->time_event_source) + 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); + } + + 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 1; +} + +_public_ sd_event* sd_bus_get_event(sd_bus *bus) { + assert_return(bus, NULL); + + return bus->event; +} + +_public_ sd_bus_message* sd_bus_get_current(sd_bus *bus) { + assert_return(bus, NULL); + + return bus->current; +} + +static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) { + sd_bus *b = NULL; + int r; + + assert(bus_open); + assert(default_bus); + + if (!ret) + return !!*default_bus; + + if (*default_bus) { + *ret = sd_bus_ref(*default_bus); + return 0; + } + + r = bus_open(&b); + if (r < 0) + return r; + + b->default_bus_ptr = default_bus; + b->tid = gettid(); + *default_bus = b; + + *ret = b; + return 1; +} + +_public_ int sd_bus_default_system(sd_bus **ret) { + static thread_local sd_bus *default_system_bus = NULL; + + return bus_default(sd_bus_open_system, &default_system_bus, ret); +} + +_public_ int sd_bus_default_user(sd_bus **ret) { + static thread_local sd_bus *default_user_bus = NULL; + + return bus_default(sd_bus_open_user, &default_user_bus, ret); +} + +_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; +} + +_public_ char *sd_bus_label_escape(const char *s) { + char *r, *t; + const char *f; + + assert_return(s, NULL); + + /* Escapes all chars that D-Bus' object path cannot deal + * with. Can be reversed with bus_path_unescape(). We special + * case the empty string. */ + + if (*s == 0) + return strdup("_"); + + 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; + } + + *t = 0; + + return r; +} + +_public_ char *sd_bus_label_unescape(const char *f) { + char *r, *t; + + assert_return(f, NULL); + + /* Special case for the empty string */ + if (streq(f, "_")) + return strdup(""); + + r = new(char, strlen(f) + 1); + if (!r) + return NULL; + + for (t = r; *f; f++) { + + if (*f == '_') { + int a, b; + + 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; + } + + *t = 0; + + return r; +} + +_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; + + assert_return(bus, -EINVAL); + assert_return(mask <= _SD_BUS_CREDS_ALL, -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); + + if (!bus->ucred_valid && !isempty(bus->label)) + return -ENODATA; + + c = bus_creds_new(); + if (!c) + return -ENOMEM; + + if (bus->ucred_valid) { + pid = c->pid = bus->ucred.pid; + c->uid = bus->ucred.uid; + c->gid = bus->ucred.gid; + + c->mask |= (SD_BUS_CREDS_UID | SD_BUS_CREDS_PID | SD_BUS_CREDS_GID) & mask; + } + + 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; + } + + c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT; + } + + r = bus_creds_add_more(c, mask, pid, 0); + if (r < 0) + return r; + + *ret = c; + return 0; +} + +_public_ int sd_bus_try_close(sd_bus *bus) { + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(bus->is_kernel, -ENOTSUP); + + if (bus->rqueue_size > 0) + return -EBUSY; + + if (bus->wqueue_size > 0) + return -EBUSY; + + r = bus_kernel_try_close(bus); + if (r < 0) + return r; + + sd_bus_close(bus); return 0; }