diff options
Diffstat (limited to 'src/libsystemd/sd-bus/sd-bus.c')
| -rw-r--r-- | src/libsystemd/sd-bus/sd-bus.c | 3853 |
1 files changed, 0 insertions, 3853 deletions
diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c deleted file mode 100644 index d746348544..0000000000 --- a/src/libsystemd/sd-bus/sd-bus.c +++ /dev/null @@ -1,3853 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2013 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <endian.h> -#include <netdb.h> -#include <poll.h> -#include <pthread.h> -#include <stdlib.h> -#include <sys/mman.h> -#include <unistd.h> - -#include "sd-bus.h" - -#include "alloc-util.h" -#include "bus-container.h" -#include "bus-control.h" -#include "bus-internal.h" -#include "bus-kernel.h" -#include "bus-label.h" -#include "bus-message.h" -#include "bus-objects.h" -#include "bus-protocol.h" -#include "bus-slot.h" -#include "bus-socket.h" -#include "bus-track.h" -#include "bus-type.h" -#include "bus-util.h" -#include "cgroup-util.h" -#include "def.h" -#include "fd-util.h" -#include "hexdecoct.h" -#include "hostname-util.h" -#include "macro.h" -#include "missing.h" -#include "parse-util.h" -#include "string-util.h" -#include "strv.h" -#include "util.h" - -#define log_debug_bus_message(m) \ - do { \ - sd_bus_message *_mm = (m); \ - log_debug("Got message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%" PRIu64 " reply_cookie=%" PRIu64 " error=%s", \ - bus_message_type_to_string(_mm->header->type), \ - strna(sd_bus_message_get_sender(_mm)), \ - strna(sd_bus_message_get_destination(_mm)), \ - strna(sd_bus_message_get_path(_mm)), \ - strna(sd_bus_message_get_interface(_mm)), \ - strna(sd_bus_message_get_member(_mm)), \ - BUS_MESSAGE_COOKIE(_mm), \ - _mm->reply_cookie, \ - strna(_mm->error.message)); \ - } while (false) - -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 thread_local sd_bus *default_system_bus = NULL; -static thread_local sd_bus *default_user_bus = NULL; -static thread_local sd_bus *default_starter_bus = NULL; - -static void bus_close_fds(sd_bus *b) { - assert(b); - - detach_io_events(b); - - if (b->input_fd != b->output_fd) - safe_close(b->output_fd); - b->output_fd = b->input_fd = safe_close(b->input_fd); -} - -static void bus_reset_queues(sd_bus *b) { - assert(b); - - while (b->rqueue_size > 0) - sd_bus_message_unref(b->rqueue[--b->rqueue_size]); - - b->rqueue = mfree(b->rqueue); - b->rqueue_allocated = 0; - - while (b->wqueue_size > 0) - sd_bus_message_unref(b->wqueue[--b->wqueue_size]); - - b->wqueue = mfree(b->wqueue); - b->wqueue_allocated = 0; -} - -static void bus_free(sd_bus *b) { - sd_bus_slot *s; - - assert(b); - assert(!b->track_queue); - assert(!b->tracks); - - b->state = BUS_CLOSED; - - sd_bus_detach_event(b); - - while ((s = b->slots)) { - /* At this point only floating slots can still be - * around, because the non-floating ones keep a - * reference to the bus, and we thus couldn't be - * destructing right now... We forcibly disconnect the - * slots here, so that they still can be referenced by - * apps, but are dead. */ - - assert(s->floating); - bus_slot_disconnect(s); - sd_bus_slot_unref(s); - } - - if (b->default_bus_ptr) - *b->default_bus_ptr = NULL; - - bus_close_fds(b); - - if (b->kdbus_buffer) - munmap(b->kdbus_buffer, KDBUS_POOL_SIZE); - - free(b->label); - free(b->rbuffer); - free(b->unique_name); - free(b->auth_buffer); - free(b->address); - free(b->kernel); - free(b->machine); - free(b->fake_label); - free(b->cgroup_root); - free(b->description); - - free(b->exec_path); - strv_free(b->exec_argv); - - close_many(b->fds, b->n_fds); - free(b->fds); - - bus_reset_queues(b); - - ordered_hashmap_free_free(b->reply_callbacks); - prioq_free(b->reply_callbacks_prioq); - - assert(b->match_callbacks.type == BUS_MATCH_ROOT); - bus_match_free(&b->match_callbacks); - - hashmap_free_free(b->vtable_methods); - hashmap_free_free(b->vtable_properties); - - assert(hashmap_isempty(b->nodes)); - hashmap_free(b->nodes); - - bus_kernel_flush_memfd(b); - - assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0); - - free(b); -} - -_public_ int sd_bus_new(sd_bus **ret) { - sd_bus *r; - - assert_return(ret, -EINVAL); - - r = new0(sd_bus, 1); - if (!r) - return -ENOMEM; - - 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 */ - if (!GREEDY_REALLOC(r->wqueue, r->wqueue_allocated, 1)) { - free(r); - return -ENOMEM; - } - - *ret = r; - return 0; -} - -_public_ int sd_bus_set_address(sd_bus *bus, const char *address) { - char *a; - - 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) - return -ENOMEM; - - free(bus->address); - bus->address = a; - - return 0; -} - -_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, -EBADF); - assert_return(output_fd >= 0, -EBADF); - assert_return(!bus_pid_changed(bus), -ECHILD); - - bus->input_fd = input_fd; - bus->output_fd = output_fd; - return 0; -} - -_public_ int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) { - char *p, **a; - - 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) - return -ENOMEM; - - a = strv_copy(argv); - if (!a) { - free(p); - return -ENOMEM; - } - - free(bus->exec_path); - strv_free(bus->exec_argv); - - bus->exec_path = p; - bus->exec_argv = a; - - return 0; -} - -_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; -} - -_public_ int sd_bus_set_monitor(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_MONITOR, b); - return 0; -} - -_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; -} - -_public_ int sd_bus_negotiate_timestamp(sd_bus *bus, int b) { - uint64_t new_flags; - assert_return(bus, -EINVAL); - assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM); - assert_return(!bus_pid_changed(bus), -ECHILD); - - new_flags = bus->attach_flags; - SET_FLAG(new_flags, KDBUS_ATTACH_TIMESTAMP, b); - - if (bus->attach_flags == new_flags) - return 0; - - bus->attach_flags = new_flags; - if (bus->state != BUS_UNSET && bus->is_kernel) - bus_kernel_realize_attach_flags(bus); - - return 0; -} - -_public_ int sd_bus_negotiate_creds(sd_bus *bus, int b, uint64_t mask) { - uint64_t new_flags; - - assert_return(bus, -EINVAL); - assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL); - assert_return(!IN_SET(bus->state, BUS_CLOSING, BUS_CLOSED), -EPERM); - assert_return(!bus_pid_changed(bus), -ECHILD); - - SET_FLAG(bus->creds_mask, mask, b); - - /* The well knowns we need unconditionally, so that matches can work */ - bus->creds_mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME; - - /* Make sure we don't lose the timestamp flag */ - new_flags = (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) | attach_flags_to_kdbus(bus->creds_mask); - if (bus->attach_flags == new_flags) - return 0; - - bus->attach_flags = new_flags; - if (bus->state != BUS_UNSET && bus->is_kernel) - bus_kernel_realize_attach_flags(bus); - - return 0; -} - -_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; -} - -_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; -} - -_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->trusted = !!b; - return 0; -} - -_public_ int sd_bus_set_description(sd_bus *bus, const char *description) { - assert_return(bus, -EINVAL); - assert_return(bus->state == BUS_UNSET, -EPERM); - assert_return(!bus_pid_changed(bus), -ECHILD); - - return free_and_strdup(&bus->description, description); -} - -_public_ int sd_bus_set_allow_interactive_authorization(sd_bus *bus, int b) { - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - bus->allow_interactive_authorization = !!b; - return 0; -} - -_public_ int sd_bus_get_allow_interactive_authorization(sd_bus *bus) { - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - return bus->allow_interactive_authorization; -} - -static int hello_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) { - const char *s; - sd_bus *bus; - int r; - - assert(reply); - bus = reply->bus; - assert(bus); - assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING); - - r = sd_bus_message_get_errno(reply); - if (r > 0) - return -r; - - r = sd_bus_message_read(reply, "s", &s); - if (r < 0) - return r; - - if (!service_name_is_valid(s) || s[0] != ':') - return -EBADMSG; - - bus->unique_name = strdup(s); - if (!bus->unique_name) - return -ENOMEM; - - if (bus->state == BUS_HELLO) - bus->state = BUS_RUNNING; - - return 1; -} - -static int bus_send_hello(sd_bus *bus) { - _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; - int r; - - assert(bus); - - if (!bus->bus_client || bus->is_kernel) - return 0; - - r = sd_bus_message_new_method_call( - bus, - &m, - "org.freedesktop.DBus", - "/org/freedesktop/DBus", - "org.freedesktop.DBus", - "Hello"); - if (r < 0) - return r; - - return sd_bus_call_async(bus, NULL, m, hello_callback, NULL, 0); -} - -int bus_start_running(sd_bus *bus) { - assert(bus); - - if (bus->bus_client && !bus->is_kernel) { - bus->state = BUS_HELLO; - return 1; - } - - bus->state = BUS_RUNNING; - return 1; -} - -static int parse_address_key(const char **p, const char *key, char **value) { - size_t l, n = 0, allocated = 0; - const char *a; - char *r = NULL; - - assert(p); - assert(*p); - assert(value); - - if (key) { - l = strlen(key); - if (strncmp(*p, key, l) != 0) - return 0; - - if ((*p)[l] != '=') - return 0; - - if (*value) - return -EINVAL; - - a = *p + l + 1; - } else - a = *p; - - while (*a != ';' && *a != ',' && *a != 0) { - char c; - - if (*a == '%') { - int x, y; - - x = unhexchar(a[1]); - if (x < 0) { - free(r); - return x; - } - - y = unhexchar(a[2]); - if (y < 0) { - free(r); - return y; - } - - c = (char) ((x << 4) | y); - a += 3; - } else { - c = *a; - a++; - } - - if (!GREEDY_REALLOC(r, allocated, n + 2)) - return -ENOMEM; - - r[n++] = c; - } - - if (!r) { - r = strdup(""); - if (!r) - return -ENOMEM; - } else - r[n] = 0; - - if (*a == ',') - a++; - - *p = a; - - free(*value); - *value = r; - - return 1; -} - -static void skip_address_key(const char **p) { - assert(p); - assert(*p); - - *p += strcspn(*p, ","); - - if (**p == ',') - (*p)++; -} - -static int parse_unix_address(sd_bus *b, const char **p, char **guid) { - _cleanup_free_ char *path = NULL, *abstract = NULL; - size_t l; - 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, "path", &path); - if (r < 0) - return r; - else if (r > 0) - continue; - - r = parse_address_key(p, "abstract", &abstract); - if (r < 0) - return r; - else if (r > 0) - continue; - - skip_address_key(p); - } - - if (!path && !abstract) - return -EINVAL; - - if (path && abstract) - return -EINVAL; - - if (path) { - l = strlen(path); - if (l > sizeof(b->sockaddr.un.sun_path)) - return -E2BIG; - - b->sockaddr.un.sun_family = AF_UNIX; - strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path)); - b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l; - } else if (abstract) { - l = strlen(abstract); - if (l > sizeof(b->sockaddr.un.sun_path) - 1) - return -E2BIG; - - b->sockaddr.un.sun_family = AF_UNIX; - b->sockaddr.un.sun_path[0] = 0; - strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1); - b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l; - } - - return 0; -} - -static int parse_tcp_address(sd_bus *b, const char **p, char **guid) { - _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL; - int r; - struct addrinfo *result, hints = { - .ai_socktype = SOCK_STREAM, - .ai_flags = AI_ADDRCONFIG, - }; - - 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, "host", &host); - if (r < 0) - return r; - else if (r > 0) - continue; - - r = parse_address_key(p, "port", &port); - if (r < 0) - return r; - else if (r > 0) - continue; - - r = parse_address_key(p, "family", &family); - if (r < 0) - return r; - else if (r > 0) - continue; - - skip_address_key(p); - } - - if (!host || !port) - return -EINVAL; - - if (family) { - if (streq(family, "ipv4")) - hints.ai_family = AF_INET; - else if (streq(family, "ipv6")) - hints.ai_family = AF_INET6; - else - return -EINVAL; - } - - r = getaddrinfo(host, port, &hints, &result); - if (r == EAI_SYSTEM) - return -errno; - else if (r != 0) - return -EADDRNOTAVAIL; - - memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen); - b->sockaddr_size = result->ai_addrlen; - - freeaddrinfo(result); - - return 0; -} - -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); - assert(p); - assert(*p); - assert(guid); - - while (**p != 0 && **p != ';') { - r = parse_address_key(p, "guid", guid); - if (r < 0) - goto fail; - else if (r > 0) - continue; - - r = parse_address_key(p, "path", &path); - if (r < 0) - goto fail; - else if (r > 0) - continue; - - if (startswith(*p, "argv")) { - unsigned ul; - - errno = 0; - ul = strtoul(*p + 4, (char**) p, 10); - if (errno > 0 || **p != '=' || ul > 256) { - r = -EINVAL; - goto fail; - } - - (*p)++; - - if (ul >= n_argv) { - if (!GREEDY_REALLOC0(argv, allocated, ul + 2)) { - r = -ENOMEM; - goto fail; - } - - n_argv = ul + 1; - } - - r = parse_address_key(p, NULL, argv + ul); - if (r < 0) - goto fail; - - continue; - } - - skip_address_key(p); - } - - if (!path) { - r = -EINVAL; - goto fail; - } - - /* Make sure there are no holes in the array, with the - * exception of argv[0] */ - for (j = 1; j < n_argv; j++) - if (!argv[j]) { - r = -EINVAL; - goto fail; - } - - if (argv && argv[0] == NULL) { - argv[0] = strdup(path); - if (!argv[0]) { - r = -ENOMEM; - goto fail; - } - } - - b->exec_path = path; - b->exec_argv = argv; - return 0; - -fail: - for (j = 0; j < n_argv; j++) - free(argv[j]); - - free(argv); - free(path); - return r; -} - -static int parse_kernel_address(sd_bus *b, const char **p, char **guid) { - _cleanup_free_ char *path = 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, "path", &path); - if (r < 0) - return r; - else if (r > 0) - continue; - - skip_address_key(p); - } - - if (!path) - return -EINVAL; - - free(b->kernel); - b->kernel = path; - path = NULL; - - return 0; -} - -static int parse_container_unix_address(sd_bus *b, const char **p, char **guid) { - _cleanup_free_ char *machine = NULL, *pid = 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; - - r = parse_address_key(p, "pid", &pid); - if (r < 0) - return r; - else if (r > 0) - continue; - - skip_address_key(p); - } - - if (!machine == !pid) - return -EINVAL; - - if (machine) { - if (!machine_name_is_valid(machine)) - return -EINVAL; - - free(b->machine); - b->machine = machine; - machine = NULL; - } else { - b->machine = mfree(b->machine); - } - - if (pid) { - r = parse_pid(pid, &b->nspid); - if (r < 0) - return r; - } else - b->nspid = 0; - - 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 = SOCKADDR_UN_LEN(b->sockaddr.un); - - return 0; -} - -static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) { - _cleanup_free_ char *machine = NULL, *pid = 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; - - r = parse_address_key(p, "pid", &pid); - if (r < 0) - return r; - else if (r > 0) - continue; - - skip_address_key(p); - } - - if (!machine == !pid) - return -EINVAL; - - if (machine) { - if (!machine_name_is_valid(machine)) - return -EINVAL; - - free(b->machine); - b->machine = machine; - machine = NULL; - } else { - b->machine = mfree(b->machine); - } - - if (pid) { - r = parse_pid(pid, &b->nspid); - if (r < 0) - return r; - } else - b->nspid = 0; - - r = free_and_strdup(&b->kernel, "/sys/fs/kdbus/0-system/bus"); - if (r < 0) - return r; - - return 0; -} - -static void bus_reset_parsed_address(sd_bus *b) { - assert(b); - - zero(b->sockaddr); - b->sockaddr_size = 0; - b->exec_argv = strv_free(b->exec_argv); - b->exec_path = mfree(b->exec_path); - b->server_id = SD_ID128_NULL; - b->kernel = mfree(b->kernel); - b->machine = mfree(b->machine); - b->nspid = 0; -} - -static int bus_parse_next_address(sd_bus *b) { - _cleanup_free_ char *guid = NULL; - const char *a; - int r; - - assert(b); - - if (!b->address) - return 0; - if (b->address[b->address_index] == 0) - return 0; - - bus_reset_parsed_address(b); - - a = b->address + b->address_index; - - while (*a != 0) { - - if (*a == ';') { - a++; - continue; - } - - if (startswith(a, "unix:")) { - a += 5; - - r = parse_unix_address(b, &a, &guid); - if (r < 0) - return r; - break; - - } else if (startswith(a, "tcp:")) { - - a += 4; - r = parse_tcp_address(b, &a, &guid); - if (r < 0) - return r; - - break; - - } else if (startswith(a, "unixexec:")) { - - a += 9; - r = parse_exec_address(b, &a, &guid); - if (r < 0) - return r; - - break; - - } else if (startswith(a, "kernel:")) { - - a += 7; - r = parse_kernel_address(b, &a, &guid); - if (r < 0) - return r; - - break; - } else if (startswith(a, "x-machine-unix:")) { - - a += 15; - r = parse_container_unix_address(b, &a, &guid); - if (r < 0) - return r; - - break; - } else if (startswith(a, "x-machine-kernel:")) { - - a += 17; - r = parse_container_kernel_address(b, &a, &guid); - if (r < 0) - return r; - - break; - } - - a = strchr(a, ';'); - if (!a) - return 0; - } - - if (guid) { - r = sd_id128_from_string(guid, &b->server_id); - if (r < 0) - return r; - } - - b->address_index = a - b->address; - return 1; -} - -static int bus_start_address(sd_bus *b) { - bool container_kdbus_available = false; - bool kdbus_available = false; - int r; - - assert(b); - - for (;;) { - bool skipped = false; - - bus_close_fds(b); - - /* - * Usually, if you provide multiple different bus-addresses, we - * try all of them in order. We use the first one that - * succeeds. However, if you mix kernel and unix addresses, we - * never try unix-addresses if a previous kernel address was - * tried and kdbus was available. This is required to prevent - * clients to fallback to the bus-proxy if kdbus is available - * but failed (eg., too many connections). - */ - - if (b->exec_path) - r = bus_socket_exec(b); - else if ((b->nspid > 0 || b->machine) && b->kernel) { - r = bus_container_connect_kernel(b); - if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT)) - container_kdbus_available = true; - - } else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC) { - if (!container_kdbus_available) - r = bus_container_connect_socket(b); - else - skipped = true; - - } else if (b->kernel) { - r = bus_kernel_connect(b); - if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT)) - kdbus_available = true; - - } else if (b->sockaddr.sa.sa_family != AF_UNSPEC) { - if (!kdbus_available) - r = bus_socket_connect(b); - else - skipped = true; - } else - skipped = true; - - if (!skipped) { - if (r >= 0) { - r = attach_io_events(b); - if (r >= 0) - return r; - } - - b->last_connect_error = -r; - } - - r = bus_parse_next_address(b); - if (r < 0) - return r; - if (r == 0) - return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED; - } -} - -int bus_next_address(sd_bus *b) { - assert(b); - - bus_reset_parsed_address(b); - return bus_start_address(b); -} - -static int bus_start_fd(sd_bus *b) { - struct stat st; - int r; - - assert(b); - assert(b->input_fd >= 0); - assert(b->output_fd >= 0); - - r = fd_nonblock(b->input_fd, true); - if (r < 0) - return r; - - r = fd_cloexec(b->input_fd, true); - if (r < 0) - return r; - - if (b->input_fd != b->output_fd) { - r = fd_nonblock(b->output_fd, true); - if (r < 0) - return r; - - r = fd_cloexec(b->output_fd, true); - if (r < 0) - return r; - } - - if (fstat(b->input_fd, &st) < 0) - return -errno; - - if (S_ISCHR(b->input_fd)) - return bus_kernel_take_fd(b); - else - return bus_socket_take_fd(b); -} - -_public_ int sd_bus_start(sd_bus *bus) { - int r; - - assert_return(bus, -EINVAL); - assert_return(bus->state == BUS_UNSET, -EPERM); - assert_return(!bus_pid_changed(bus), -ECHILD); - - bus->state = BUS_OPENING; - - if (bus->is_server && bus->bus_client) - return -EINVAL; - - 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 || bus->machine) - r = bus_start_address(bus); - else - return -EINVAL; - - if (r < 0) { - sd_bus_close(bus); - return r; - } - - return bus_send_hello(bus); -} - -_public_ int sd_bus_open(sd_bus **ret) { - const char *e; - sd_bus *b; - int r; - - assert_return(ret, -EINVAL); - - /* Let's connect to the starter bus if it is set, and - * otherwise to the bus that is appropropriate for the scope - * we are running in */ - - e = secure_getenv("DBUS_STARTER_BUS_TYPE"); - if (e) { - if (streq(e, "system")) - return sd_bus_open_system(ret); - else if (STR_IN_SET(e, "session", "user")) - return sd_bus_open_user(ret); - } - - e = secure_getenv("DBUS_STARTER_ADDRESS"); - if (!e) { - if (cg_pid_get_owner_uid(0, NULL) >= 0) - return sd_bus_open_user(ret); - else - return sd_bus_open_system(ret); - } - - r = sd_bus_new(&b); - if (r < 0) - return r; - - r = sd_bus_set_address(b, e); - if (r < 0) - goto fail; - - b->bus_client = true; - - /* We don't know whether the bus is trusted or not, so better - * be safe, and authenticate everything */ - b->trusted = false; - b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS; - b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS; - - r = sd_bus_start(b); - if (r < 0) - goto fail; - - *ret = b; - return 0; - -fail: - bus_free(b); - return r; -} - -int bus_set_address_system(sd_bus *b) { - const char *e; - assert(b); - - e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS"); - if (e) - return sd_bus_set_address(b, e); - - return sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_ADDRESS); -} - -_public_ int sd_bus_open_system(sd_bus **ret) { - sd_bus *b; - int r; - - assert_return(ret, -EINVAL); - - r = sd_bus_new(&b); - if (r < 0) - return r; - - r = bus_set_address_system(b); - if (r < 0) - goto fail; - - b->bus_client = true; - b->is_system = 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; - b->creds_mask |= SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_EFFECTIVE_CAPS; - - r = sd_bus_start(b); - if (r < 0) - goto fail; - - *ret = b; - return 0; - -fail: - bus_free(b); - return r; -} - -int bus_set_address_user(sd_bus *b) { - const char *e; - uid_t uid; - int r; - - assert(b); - - e = secure_getenv("DBUS_SESSION_BUS_ADDRESS"); - if (e) - return sd_bus_set_address(b, e); - - r = cg_pid_get_owner_uid(0, &uid); - if (r < 0) - uid = getuid(); - - e = secure_getenv("XDG_RUNTIME_DIR"); - if (e) { - _cleanup_free_ char *ee = NULL; - - ee = bus_address_escape(e); - if (!ee) - return -ENOMEM; - - (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, ee); - } else - (void) asprintf(&b->address, KERNEL_USER_BUS_ADDRESS_FMT, uid); - - if (!b->address) - return -ENOMEM; - - return 0; -} - -_public_ int sd_bus_open_user(sd_bus **ret) { - sd_bus *b; - int r; - - assert_return(ret, -EINVAL); - - r = sd_bus_new(&b); - if (r < 0) - return r; - - r = bus_set_address_user(b); - if (r < 0) - return r; - - b->bus_client = true; - b->is_user = 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; - - *ret = b; - return 0; - -fail: - bus_free(b); - return r; -} - -int bus_set_address_system_remote(sd_bus *b, const char *host) { - _cleanup_free_ char *e = NULL; - char *m = NULL, *c = NULL; - - assert(b); - assert(host); - - /* Let's see if we shall enter some container */ - m = strchr(host, ':'); - if (m) { - m++; - - /* Let's make sure this is not a port of some kind, - * and is a valid machine name. */ - if (!in_charset(m, "0123456789") && machine_name_is_valid(m)) { - char *t; - - /* Cut out the host part */ - t = strndupa(host, m - host - 1); - e = bus_address_escape(t); - if (!e) - return -ENOMEM; - - c = strjoina(",argv4=--machine=", m); - } - } - - if (!e) { - e = bus_address_escape(host); - if (!e) - return -ENOMEM; - } - - b->address = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", c, NULL); - if (!b->address) - return -ENOMEM; - - return 0; - } - -_public_ int sd_bus_open_system_remote(sd_bus **ret, const char *host) { - sd_bus *bus; - int r; - - assert_return(host, -EINVAL); - assert_return(ret, -EINVAL); - - r = sd_bus_new(&bus); - if (r < 0) - return r; - - r = bus_set_address_system_remote(bus, host); - if (r < 0) - goto fail; - - bus->bus_client = true; - bus->trusted = false; - bus->is_system = true; - - r = sd_bus_start(bus); - if (r < 0) - goto fail; - - *ret = bus; - return 0; - -fail: - bus_free(bus); - return r; -} - -int bus_set_address_system_machine(sd_bus *b, const char *machine) { - _cleanup_free_ char *e = NULL; - - assert(b); - assert(machine); - - e = bus_address_escape(machine); - if (!e) - return -ENOMEM; - - b->address = strjoin("x-machine-kernel:machine=", e, ";x-machine-unix:machine=", e, NULL); - if (!b->address) - return -ENOMEM; - - return 0; -} - -_public_ int sd_bus_open_system_machine(sd_bus **ret, const char *machine) { - sd_bus *bus; - int r; - - assert_return(machine, -EINVAL); - assert_return(ret, -EINVAL); - assert_return(machine_name_is_valid(machine), -EINVAL); - - r = sd_bus_new(&bus); - if (r < 0) - return r; - - r = bus_set_address_system_machine(bus, machine); - if (r < 0) - goto fail; - - bus->bus_client = true; - bus->trusted = false; - bus->is_system = true; - - r = sd_bus_start(bus); - if (r < 0) - goto fail; - - *ret = bus; - return 0; - -fail: - bus_free(bus); - return r; -} - -_public_ void sd_bus_close(sd_bus *bus) { - - if (!bus) - return; - if (bus->state == BUS_CLOSED) - return; - if (bus_pid_changed(bus)) - return; - - 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_FREE - * ioctl on the fd when they are freed. */ -} - -_public_ sd_bus* sd_bus_flush_close_unref(sd_bus *bus) { - - if (!bus) - return NULL; - - sd_bus_flush(bus); - sd_bus_close(bus); - - return sd_bus_unref(bus); -} - -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) { - - if (!bus) - return NULL; - - assert_se(REFCNT_INC(bus->n_ref) >= 2); - - return bus; -} - -_public_ sd_bus *sd_bus_unref(sd_bus *bus) { - unsigned i; - - if (!bus) - return NULL; - - i = REFCNT_DEC(bus->n_ref); - if (i > 0) - return NULL; - - bus_free(bus); - return NULL; -} - -_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); -} - -_public_ int sd_bus_can_send(sd_bus *bus, char type) { - int r; - - assert_return(bus, -EINVAL); - assert_return(bus->state != BUS_UNSET, -ENOTCONN); - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (bus->hello_flags & KDBUS_HELLO_MONITOR) - return 0; - - if (type == SD_BUS_TYPE_UNIX_FD) { - if (!(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) - return 0; - - r = bus_ensure_running(bus); - if (r < 0) - return r; - - return bus->can_fds; - } - - return bus_type_is_valid(type); -} - -_public_ int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id) { - int r; - - assert_return(bus, -EINVAL); - assert_return(id, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - r = bus_ensure_running(bus); - if (r < 0) - return r; - - *id = bus->server_id; - return 0; -} - -static int bus_seal_message(sd_bus *b, sd_bus_message *m, usec_t timeout) { - assert(b); - assert(m); - - 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) { - bool remarshal = false; - - assert(b); - - /* wrong packet version */ - if (b->message_version != 0 && b->message_version != (*m)->header->version) - remarshal = true; - - /* wrong packet endianness */ - if (b->message_endian != 0 && b->message_endian != (*m)->header->endian) - remarshal = true; - - /* TODO: kdbus-messages received from the kernel contain data which is - * not allowed to be passed to KDBUS_CMD_SEND. Therefore, we have to - * force remarshaling of the message. Technically, we could just - * recreate the kdbus message, but that is non-trivial as other parts of - * the message refer to m->kdbus already. This should be fixed! */ - if ((*m)->kdbus && (*m)->release_kdbus) - remarshal = true; - - return remarshal ? bus_message_remarshal(b, m) : 0; -} - -int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) { - assert(b); - assert(m); - - /* Fake some timestamps, if they were requested, and not - * already initialized */ - if (b->attach_flags & KDBUS_ATTACH_TIMESTAMP) { - if (m->realtime <= 0) - m->realtime = now(CLOCK_REALTIME); - - if (m->monotonic <= 0) - m->monotonic = now(CLOCK_MONOTONIC); - } - - /* 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, artificial 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, bool hint_sync_call, size_t *idx) { - int r; - - assert(bus); - assert(m); - - if (bus->is_kernel) - r = bus_kernel_write_message(bus, m, hint_sync_call); - else - r = bus_socket_write_message(bus, m, idx); - - if (r <= 0) - return r; - - 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=%" PRIu64 " reply_cookie=%" PRIu64 " 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)), - BUS_MESSAGE_COOKIE(m), - 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], false, &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 - * the queue. - * - * This isn't particularly optimized, but - * well, this is supposed to be our worst-case - * buffer only, and the socket buffer is - * supposed to be our primary buffer, and if - * it got full, then all bets are off - * anyway. */ - - bus->wqueue_size--; - sd_bus_message_unref(bus->wqueue[0]); - memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size); - bus->windex = 0; - - ret = 1; - } - } - - return ret; -} - -static int bus_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { - assert(bus); - - if (bus->is_kernel) - return bus_kernel_read_message(bus, hint_priority, priority); - 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, bool hint_priority, int64_t priority, sd_bus_message **m) { - int r, ret = 0; - - assert(bus); - assert(m); - assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); - - /* Note that the priority logic is only available on kdbus, - * where the rqueue is unused. We check the rqueue here - * anyway, because it's simple... */ - - for (;;) { - 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; - } - - /* Try to read a new message */ - r = bus_read_message(bus, hint_priority, priority); - if (r < 0) - return r; - if (r == 0) - return ret; - - ret = 1; - } -} - -static int bus_send_internal(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie, bool hint_sync_call) { - _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m); - int r; - - assert_return(m, -EINVAL); - - if (!bus) - bus = m->bus; - - assert_return(!bus_pid_changed(bus), -ECHILD); - assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS); - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - if (m->n_fds > 0) { - r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD); - if (r < 0) - return r; - if (r == 0) - return -EOPNOTSUPP; - } - - /* If the cookie number isn't kept, then we know that no reply - * is 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; - - /* Remarshall if we have to. This will possibly 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) - goto finish; - - if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) { - size_t idx = 0; - - r = bus_write_message(bus, m, hint_sync_call, &idx); - if (r < 0) { - if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) { - bus_enter_closing(bus); - return -ECONNRESET; - } - - return r; - } - - if (!bus->is_kernel && idx < BUS_MESSAGE_SIZE(m)) { - /* Wasn't fully written. So let's remember how - * much was written. Note that the first entry - * of the wqueue array is always allocated so - * that we always can remember how much was - * written. */ - bus->wqueue[0] = sd_bus_message_ref(m); - bus->wqueue_size = 1; - bus->windex = idx; - } - - } else { - /* Just append it to the queue. */ - - if (bus->wqueue_size >= BUS_WQUEUE_MAX) - return -ENOBUFS; - - if (!GREEDY_REALLOC(bus->wqueue, bus->wqueue_allocated, bus->wqueue_size + 1)) - return -ENOMEM; - - bus->wqueue[bus->wqueue_size++] = sd_bus_message_ref(m); - } - -finish: - if (cookie) - *cookie = BUS_MESSAGE_COOKIE(m); - - return 1; -} - -_public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *cookie) { - return bus_send_internal(bus, m, cookie, false); -} - -_public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) { - int r; - - assert_return(m, -EINVAL); - - if (!bus) - bus = m->bus; - - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - 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; - - return now(CLOCK_MONOTONIC) + usec; -} - -static int timeout_compare(const void *a, const void *b) { - const struct reply_callback *x = a, *y = b; - - if (x->timeout != 0 && y->timeout == 0) - return -1; - - if (x->timeout == 0 && y->timeout != 0) - return 1; - - if (x->timeout < y->timeout) - return -1; - - if (x->timeout > y->timeout) - return 1; - - return 0; -} - -_public_ int sd_bus_call_async( - sd_bus *bus, - sd_bus_slot **slot, - sd_bus_message *_m, - sd_bus_message_handler_t callback, - void *userdata, - uint64_t usec) { - - _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m); - _cleanup_(sd_bus_slot_unrefp) sd_bus_slot *s = NULL; - int r; - - assert_return(m, -EINVAL); - assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); - assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); - assert_return(callback, -EINVAL); - - if (!bus) - bus = m->bus; - - assert_return(!bus_pid_changed(bus), -ECHILD); - assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS); - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - r = ordered_hashmap_ensure_allocated(&bus->reply_callbacks, &uint64_hash_ops); - 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_remarshal_message(bus, &m); - if (r < 0) - return r; - - s = bus_slot_allocate(bus, !slot, BUS_REPLY_CALLBACK, sizeof(struct reply_callback), userdata); - if (!s) - return -ENOMEM; - - s->reply_callback.callback = callback; - - s->reply_callback.cookie = BUS_MESSAGE_COOKIE(m); - r = ordered_hashmap_put(bus->reply_callbacks, &s->reply_callback.cookie, &s->reply_callback); - if (r < 0) { - s->reply_callback.cookie = 0; - return r; - } - - s->reply_callback.timeout = calc_elapse(m->timeout); - if (s->reply_callback.timeout != 0) { - r = prioq_put(bus->reply_callbacks_prioq, &s->reply_callback, &s->reply_callback.prioq_idx); - if (r < 0) { - s->reply_callback.timeout = 0; - return r; - } - } - - r = sd_bus_send(bus, m, &s->reply_callback.cookie); - if (r < 0) - return r; - - if (slot) - *slot = s; - s = NULL; - - return r; -} - -int bus_ensure_running(sd_bus *bus) { - int r; - - assert(bus); - - if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED || bus->state == BUS_CLOSING) - return -ENOTCONN; - if (bus->state == BUS_RUNNING) - return 1; - - for (;;) { - r = sd_bus_process(bus, NULL); - if (r < 0) - return r; - if (bus->state == BUS_RUNNING) - return 1; - if (r > 0) - continue; - - r = sd_bus_wait(bus, (uint64_t) -1); - if (r < 0) - return r; - } -} - -_public_ int sd_bus_call( - sd_bus *bus, - sd_bus_message *_m, - uint64_t usec, - sd_bus_error *error, - sd_bus_message **reply) { - - _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = sd_bus_message_ref(_m); - usec_t timeout; - uint64_t cookie; - unsigned i; - int r; - - bus_assert_return(m, -EINVAL, error); - bus_assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL, error); - bus_assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL, error); - bus_assert_return(!bus_error_is_dirty(error), -EINVAL, error); - - if (!bus) - bus = m->bus; - - bus_assert_return(!bus_pid_changed(bus), -ECHILD, error); - bus_assert_return(!bus->is_kernel || !(bus->hello_flags & KDBUS_HELLO_MONITOR), -EROFS, error); - - if (!BUS_IS_OPEN(bus->state)) { - r = -ENOTCONN; - goto fail; - } - - r = bus_ensure_running(bus); - if (r < 0) - goto fail; - - i = bus->rqueue_size; - - r = bus_seal_message(bus, m, usec); - if (r < 0) - goto fail; - - r = bus_remarshal_message(bus, &m); - if (r < 0) - goto fail; - - r = bus_send_internal(bus, m, &cookie, true); - if (r < 0) - goto fail; - - timeout = calc_elapse(m->timeout); - - for (;;) { - usec_t left; - - while (i < bus->rqueue_size) { - sd_bus_message *incoming = NULL; - - incoming = bus->rqueue[i]; - - 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--; - log_debug_bus_message(incoming); - - if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) { - - if (incoming->n_fds <= 0 || (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) { - if (reply) - *reply = incoming; - else - sd_bus_message_unref(incoming); - - return 1; - } - - r = sd_bus_error_setf(error, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptors which I couldn't accept. Sorry."); - sd_bus_message_unref(incoming); - return r; - - } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) { - r = sd_bus_error_copy(error, &incoming->error); - sd_bus_message_unref(incoming); - return r; - } else { - r = -EIO; - goto fail; - } - - } else if (BUS_MESSAGE_COOKIE(incoming) == cookie && - bus->unique_name && - incoming->sender && - streq(bus->unique_name, incoming->sender)) { - - 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); - r = -ELOOP; - goto fail; - } - - /* Try to read more, right-away */ - i++; - } - - r = bus_read_message(bus, false, 0); - if (r < 0) { - if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) { - bus_enter_closing(bus); - r = -ECONNRESET; - } - - goto fail; - } - if (r > 0) - continue; - - if (timeout > 0) { - usec_t n; - - n = now(CLOCK_MONOTONIC); - if (n >= timeout) { - r = -ETIMEDOUT; - goto fail; - } - - left = timeout - n; - } else - left = (uint64_t) -1; - - r = bus_poll(bus, true, left); - if (r < 0) - goto fail; - if (r == 0) { - r = -ETIMEDOUT; - goto fail; - } - - r = dispatch_wqueue(bus); - if (r < 0) { - if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) { - bus_enter_closing(bus); - r = -ECONNRESET; - } - - goto fail; - } - } - -fail: - return sd_bus_error_set_errno(error, r); -} - -_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; -} - -_public_ int sd_bus_get_events(sd_bus *bus) { - int flags = 0; - - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING) - return -ENOTCONN; - - if (bus->state == BUS_OPENING) - flags |= POLLOUT; - else if (bus->state == BUS_AUTHENTICATING) { - - if (bus_socket_auth_needs_write(bus)) - flags |= POLLOUT; - - flags |= POLLIN; - - } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) { - if (bus->rqueue_size <= 0) - flags |= POLLIN; - if (bus->wqueue_size > 0) - flags |= POLLOUT; - } - - return flags; -} - -_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_pid_changed(bus), -ECHILD); - - if (!BUS_IS_OPEN(bus->state) && bus->state != BUS_CLOSING) - return -ENOTCONN; - - if (bus->track_queue) { - *timeout_usec = 0; - return 1; - } - - if (bus->state == BUS_CLOSING) { - *timeout_usec = 0; - return 1; - } - - if (bus->state == BUS_AUTHENTICATING) { - *timeout_usec = bus->auth_timeout; - return 1; - } - - if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) { - *timeout_usec = (uint64_t) -1; - 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; - return 0; - } - - if (c->timeout == 0) { - *timeout_usec = (uint64_t) -1; - return 0; - } - - *timeout_usec = c->timeout; - return 1; -} - -static int process_timeout(sd_bus *bus) { - _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL; - _cleanup_(sd_bus_message_unrefp) sd_bus_message* m = NULL; - struct reply_callback *c; - sd_bus_slot *slot; - usec_t n; - int r; - - assert(bus); - - c = prioq_peek(bus->reply_callbacks_prioq); - if (!c) - return 0; - - n = now(CLOCK_MONOTONIC); - if (c->timeout > n) - return 0; - - r = bus_message_new_synthetic_error( - bus, - c->cookie, - &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out"), - &m); - if (r < 0) - return r; - - r = bus_seal_synthetic_message(bus, m); - if (r < 0) - return r; - - assert_se(prioq_pop(bus->reply_callbacks_prioq) == c); - c->timeout = 0; - - ordered_hashmap_remove(bus->reply_callbacks, &c->cookie); - c->cookie = 0; - - slot = container_of(c, sd_bus_slot, reply_callback); - - bus->iteration_counter++; - - bus->current_message = m; - bus->current_slot = sd_bus_slot_ref(slot); - bus->current_handler = c->callback; - bus->current_userdata = slot->userdata; - r = c->callback(m, slot->userdata, &error_buffer); - bus->current_userdata = NULL; - bus->current_handler = NULL; - bus->current_slot = NULL; - bus->current_message = NULL; - - if (slot->floating) { - bus_slot_disconnect(slot); - sd_bus_slot_unref(slot); - } - - sd_bus_slot_unref(slot); - - return bus_maybe_reply_error(m, r, &error_buffer); -} - -static int process_hello(sd_bus *bus, sd_bus_message *m) { - assert(bus); - assert(m); - - if (bus->state != BUS_HELLO) - return 0; - - /* Let's make sure the first message on the bus is the HELLO - * reply. But note that we don't actually parse the message - * 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_METHOD_RETURN && - m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) - return -EIO; - - if (m->reply_cookie != 1) - return -EIO; - - return 0; -} - -static int process_reply(sd_bus *bus, sd_bus_message *m) { - _cleanup_(sd_bus_message_unrefp) sd_bus_message *synthetic_reply = NULL; - _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL; - struct reply_callback *c; - sd_bus_slot *slot; - int r; - - assert(bus); - assert(m); - - if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN && - m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) - return 0; - - if (bus->is_kernel && (bus->hello_flags & KDBUS_HELLO_MONITOR)) - return 0; - - if (m->destination && bus->unique_name && !streq_ptr(m->destination, bus->unique_name)) - return 0; - - c = ordered_hashmap_remove(bus->reply_callbacks, &m->reply_cookie); - if (!c) - return 0; - - c->cookie = 0; - - slot = container_of(c, sd_bus_slot, reply_callback); - - if (m->n_fds > 0 && !(bus->hello_flags & KDBUS_HELLO_ACCEPT_FD)) { - - /* If the reply contained a file descriptor which we - * didn't want we pass an error instead. */ - - r = bus_message_new_synthetic_error( - bus, - m->reply_cookie, - &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Reply message contained file descriptor"), - &synthetic_reply); - if (r < 0) - return r; - - /* Copy over original timestamp */ - synthetic_reply->realtime = m->realtime; - synthetic_reply->monotonic = m->monotonic; - synthetic_reply->seqnum = m->seqnum; - - r = bus_seal_synthetic_message(bus, synthetic_reply); - if (r < 0) - return r; - - m = synthetic_reply; - } else { - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; - } - - if (c->timeout != 0) { - prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); - c->timeout = 0; - } - - bus->current_slot = sd_bus_slot_ref(slot); - bus->current_handler = c->callback; - bus->current_userdata = slot->userdata; - r = c->callback(m, slot->userdata, &error_buffer); - bus->current_userdata = NULL; - bus->current_handler = NULL; - bus->current_slot = NULL; - - if (slot->floating) { - bus_slot_disconnect(slot); - sd_bus_slot_unref(slot); - } - - sd_bus_slot_unref(slot); - - return bus_maybe_reply_error(m, r, &error_buffer); -} - -static int process_filter(sd_bus *bus, sd_bus_message *m) { - _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL; - struct filter_callback *l; - int r; - - assert(bus); - assert(m); - - do { - bus->filter_callbacks_modified = false; - - LIST_FOREACH(callbacks, l, bus->filter_callbacks) { - sd_bus_slot *slot; - - if (bus->filter_callbacks_modified) - break; - - /* Don't run this more than once per iteration */ - if (l->last_iteration == bus->iteration_counter) - continue; - - l->last_iteration = bus->iteration_counter; - - r = sd_bus_message_rewind(m, true); - if (r < 0) - return r; - - slot = container_of(l, sd_bus_slot, filter_callback); - - bus->current_slot = sd_bus_slot_ref(slot); - bus->current_handler = l->callback; - bus->current_userdata = slot->userdata; - r = l->callback(m, slot->userdata, &error_buffer); - bus->current_userdata = NULL; - bus->current_handler = NULL; - bus->current_slot = sd_bus_slot_unref(slot); - - r = bus_maybe_reply_error(m, r, &error_buffer); - if (r != 0) - return r; - - } - - } while (bus->filter_callbacks_modified); - - return 0; -} - -static int process_match(sd_bus *bus, sd_bus_message *m) { - int r; - - assert(bus); - assert(m); - - do { - bus->match_callbacks_modified = false; - - r = bus_match_run(bus, &bus->match_callbacks, m); - if (r != 0) - return r; - - } while (bus->match_callbacks_modified); - - return 0; -} - -static int process_builtin(sd_bus *bus, sd_bus_message *m) { - _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; - int r; - - assert(bus); - assert(m); - - if (bus->hello_flags & KDBUS_HELLO_MONITOR) - return 0; - - 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 & BUS_MESSAGE_NO_REPLY_EXPECTED) - return 1; - - if (streq_ptr(m->member, "Ping")) - r = sd_bus_message_new_method_return(m, &reply); - else if (streq_ptr(m->member, "GetMachineId")) { - sd_id128_t id; - char sid[33]; - - r = sd_id128_get_machine(&id); - if (r < 0) - return r; - - 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( - m, &reply, - SD_BUS_ERROR_UNKNOWN_METHOD, - "Unknown method '%s' on interface '%s'.", m->member, m->interface); - } - - if (r < 0) - return r; - - r = sd_bus_send(bus, reply, NULL); - if (r < 0) - return r; - - return 1; -} - -static int process_fd_check(sd_bus *bus, sd_bus_message *m) { - assert(bus); - assert(m); - - /* If we got a message with a file descriptor which we didn't - * want to accept, then let's drop it. How can this even - * happen? For example, when the kernel queues a message into - * an activatable names's queue which allows fds, and then is - * delivered to us later even though we ourselves did not - * negotiate it. */ - - if (bus->hello_flags & KDBUS_HELLO_MONITOR) - return 0; - - if (m->n_fds <= 0) - return 0; - - if (bus->hello_flags & KDBUS_HELLO_ACCEPT_FD) - return 0; - - if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL) - return 1; /* just eat it up */ - - return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_INCONSISTENT_MESSAGE, "Message contains file descriptors, which I cannot accept. Sorry."); -} - -static int process_message(sd_bus *bus, sd_bus_message *m) { - int r; - - assert(bus); - assert(m); - - bus->current_message = m; - bus->iteration_counter++; - - log_debug_bus_message(m); - - r = process_hello(bus, m); - if (r != 0) - goto finish; - - r = process_reply(bus, m); - if (r != 0) - goto finish; - - r = process_fd_check(bus, m); - if (r != 0) - goto finish; - - r = process_filter(bus, m); - if (r != 0) - goto finish; - - r = process_match(bus, m); - if (r != 0) - goto finish; - - r = process_builtin(bus, m); - if (r != 0) - goto finish; - - r = bus_process_object(bus, m); - -finish: - bus->current_message = NULL; - return r; -} - -static int dispatch_track(sd_bus *bus) { - assert(bus); - - if (!bus->track_queue) - return 0; - - bus_track_dispatch(bus->track_queue); - return 1; -} - -static int process_running(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) { - _cleanup_(sd_bus_message_unrefp) 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_track(bus); - if (r != 0) - goto null_message; - - r = dispatch_rqueue(bus, hint_priority, priority, &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_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( - m, - SD_BUS_ERROR_UNKNOWN_OBJECT, - "Unknown object '%s'.", m->path); - if (r < 0) - return r; - } - - return 1; - -null_message: - if (r >= 0 && ret) - *ret = NULL; - - return r; -} - -static int bus_exit_now(sd_bus *bus) { - assert(bus); - - /* Exit due to close, if this is requested. If this is bus object is attached to an event source, invokes - * sd_event_exit(), otherwise invokes libc exit(). */ - - if (bus->exited) /* did we already exit? */ - return 0; - if (!bus->exit_triggered) /* was the exit condition triggered? */ - return 0; - if (!bus->exit_on_disconnect) /* Shall we actually exit on disconnection? */ - return 0; - - bus->exited = true; /* never exit more than once */ - - log_debug("Bus connection disconnected, exiting."); - - if (bus->event) - return sd_event_exit(bus->event, EXIT_FAILURE); - else - exit(EXIT_FAILURE); - - assert_not_reached("exit() didn't exit?"); -} - -static int process_closing_reply_callback(sd_bus *bus, struct reply_callback *c) { - _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL; - _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; - sd_bus_slot *slot; - int r; - - assert(bus); - assert(c); - - 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); - c->timeout = 0; - } - - ordered_hashmap_remove(bus->reply_callbacks, &c->cookie); - c->cookie = 0; - - slot = container_of(c, sd_bus_slot, reply_callback); - - bus->iteration_counter++; - - bus->current_message = m; - bus->current_slot = sd_bus_slot_ref(slot); - bus->current_handler = c->callback; - bus->current_userdata = slot->userdata; - r = c->callback(m, slot->userdata, &error_buffer); - bus->current_userdata = NULL; - bus->current_handler = NULL; - bus->current_slot = NULL; - bus->current_message = NULL; - - if (slot->floating) { - bus_slot_disconnect(slot); - sd_bus_slot_unref(slot); - } - - sd_bus_slot_unref(slot); - - return bus_maybe_reply_error(m, r, &error_buffer); -} - -static int process_closing(sd_bus *bus, sd_bus_message **ret) { - _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; - struct reply_callback *c; - int r; - - assert(bus); - assert(bus->state == BUS_CLOSING); - - /* First, fail all outstanding method calls */ - c = ordered_hashmap_first(bus->reply_callbacks); - if (c) - return process_closing_reply_callback(bus, c); - - /* Then, fake-drop all remaining bus tracking references */ - if (bus->tracks) { - bus_track_close(bus->tracks); - return 1; - } - - /* Then, synthesize a Disconnected message */ - r = sd_bus_message_new_signal( - bus, - &m, - "/org/freedesktop/DBus/Local", - "org.freedesktop.DBus.Local", - "Disconnected"); - if (r < 0) - return r; - - bus_message_set_sender_local(bus, m); - - r = bus_seal_synthetic_message(bus, m); - if (r < 0) - return r; - - sd_bus_close(bus); - - bus->current_message = m; - bus->iteration_counter++; - - r = process_filter(bus, m); - if (r != 0) - goto finish; - - r = process_match(bus, m); - if (r != 0) - goto finish; - - /* Nothing else to do, exit now, if the condition holds */ - bus->exit_triggered = true; - (void) bus_exit_now(bus); - - if (ret) { - *ret = m; - m = NULL; - } - - r = 1; - -finish: - bus->current_message = NULL; - - return r; -} - -static int bus_process_internal(sd_bus *bus, bool hint_priority, int64_t priority, sd_bus_message **ret) { - BUS_DONT_DESTROY(bus); - 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. */ - - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - /* We don't allow recursively invoking sd_bus_process(). */ - assert_return(!bus->current_message, -EBUSY); - assert(!bus->current_slot); - - switch (bus->state) { - - case BUS_UNSET: - return -ENOTCONN; - - case BUS_CLOSED: - return -ECONNRESET; - - case BUS_OPENING: - r = bus_socket_process_opening(bus); - if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -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 (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -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: - r = process_running(bus, hint_priority, priority, ret); - if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -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"); -} - -_public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { - return bus_process_internal(bus, false, 0, ret); -} - -_public_ int sd_bus_process_priority(sd_bus *bus, int64_t priority, sd_bus_message **ret) { - return bus_process_internal(bus, true, priority, ret); -} - -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_INFINITY; - - assert(bus); - - if (bus->state == BUS_CLOSING) - return 1; - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - 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_get_timeout(bus, &until); - if (r < 0) - return r; - if (r > 0) { - 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; -} - -_public_ int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { - - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (bus->state == BUS_CLOSING) - return 0; - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - if (bus->rqueue_size > 0) - return 0; - - return bus_poll(bus, false, timeout_usec); -} - -_public_ int sd_bus_flush(sd_bus *bus) { - int r; - - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (bus->state == BUS_CLOSING) - return 0; - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - 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) { - if (IN_SET(r, -ENOTCONN, -ECONNRESET, -EPIPE, -ESHUTDOWN)) { - bus_enter_closing(bus); - return -ECONNRESET; - } - - return r; - } - - if (bus->wqueue_size <= 0) - return 0; - - r = bus_poll(bus, false, (uint64_t) -1); - if (r < 0) - return r; - } -} - -_public_ int sd_bus_add_filter( - sd_bus *bus, - sd_bus_slot **slot, - sd_bus_message_handler_t callback, - void *userdata) { - - sd_bus_slot *s; - - assert_return(bus, -EINVAL); - assert_return(callback, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - s = bus_slot_allocate(bus, !slot, BUS_FILTER_CALLBACK, sizeof(struct filter_callback), userdata); - if (!s) - return -ENOMEM; - - s->filter_callback.callback = callback; - - bus->filter_callbacks_modified = true; - LIST_PREPEND(callbacks, bus->filter_callbacks, &s->filter_callback); - - if (slot) - *slot = s; - - return 0; -} - -_public_ int sd_bus_add_match( - sd_bus *bus, - sd_bus_slot **slot, - const char *match, - sd_bus_message_handler_t callback, - void *userdata) { - - struct bus_match_component *components = NULL; - unsigned n_components = 0; - sd_bus_slot *s = NULL; - int r = 0; - - assert_return(bus, -EINVAL); - assert_return(match, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - r = bus_match_parse(match, &components, &n_components); - if (r < 0) - goto finish; - - s = bus_slot_allocate(bus, !slot, BUS_MATCH_CALLBACK, sizeof(struct match_callback), userdata); - if (!s) { - r = -ENOMEM; - goto finish; - } - - s->match_callback.callback = callback; - s->match_callback.cookie = ++bus->match_cookie; - - if (bus->bus_client) { - enum bus_match_scope scope; - - scope = bus_match_get_scope(components, n_components); - - /* Do not install server-side matches for matches - * against the local service, interface or bus - * path. */ - if (scope != BUS_MATCH_LOCAL) { - - if (!bus->is_kernel) { - /* When this is not a kernel transport, we - * store the original match string, so that we - * can use it to remove the match again */ - - s->match_callback.match_string = strdup(match); - if (!s->match_callback.match_string) { - r = -ENOMEM; - goto finish; - } - } - - r = bus_add_match_internal(bus, s->match_callback.match_string, components, n_components, s->match_callback.cookie); - if (r < 0) - goto finish; - - s->match_added = true; - } - } - - bus->match_callbacks_modified = true; - r = bus_match_add(&bus->match_callbacks, components, n_components, &s->match_callback); - if (r < 0) - goto finish; - - if (slot) - *slot = s; - s = NULL; - -finish: - bus_match_parse_free(components, n_components); - sd_bus_slot_unref(s); - - return r; -} - -int bus_remove_match_by_string( - sd_bus *bus, - const char *match, - sd_bus_message_handler_t callback, - void *userdata) { - - struct bus_match_component *components = NULL; - unsigned n_components = 0; - struct match_callback *c; - int r = 0; - - assert_return(bus, -EINVAL); - assert_return(match, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - r = bus_match_parse(match, &components, &n_components); - if (r < 0) - goto finish; - - r = bus_match_find(&bus->match_callbacks, components, n_components, NULL, NULL, &c); - if (r <= 0) - goto finish; - - sd_bus_slot_unref(container_of(c, sd_bus_slot, match_callback)); - -finish: - bus_match_parse_free(components, n_components); - - return r; -} - -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 int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - sd_bus *bus = userdata; - int r; - - assert(bus); - - r = sd_bus_process(bus, NULL); - if (r < 0) - return r; - - return 1; -} - -static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) { - sd_bus *bus = userdata; - int r; - - assert(bus); - - r = sd_bus_process(bus, NULL); - if (r < 0) - return r; - - return 1; -} - -static int prepare_callback(sd_event_source *s, void *userdata) { - sd_bus *bus = userdata; - int r, e; - usec_t until; - - assert(s); - assert(bus); - - e = sd_bus_get_events(bus); - if (e < 0) - return e; - - if (bus->output_fd != bus->input_fd) { - - r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN); - 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_get_timeout(bus, &until); - if (r < 0) - return r; - if (r > 0) { - int j; - - j = sd_event_source_set_time(bus->time_event_source, until); - if (j < 0) - return j; - } - - r = sd_event_source_set_enabled(bus->time_event_source, r > 0); - if (r < 0) - return r; - - return 1; -} - -static int quit_callback(sd_event_source *event, void *userdata) { - sd_bus *bus = userdata; - - assert(event); - - sd_bus_flush(bus); - sd_bus_close(bus); - - return 1; -} - -static int attach_io_events(sd_bus *bus) { - int r; - - assert(bus); - - if (bus->input_fd < 0) - return 0; - - if (!bus->event) - return 0; - - if (!bus->input_io_event_source) { - r = sd_event_add_io(bus->event, &bus->input_io_event_source, bus->input_fd, 0, io_callback, bus); - 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); - if (r < 0) - return r; - - r = sd_event_source_set_description(bus->input_io_event_source, "bus-input"); - } else - r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd); - - if (r < 0) - return r; - - if (bus->output_fd != bus->input_fd) { - assert(bus->output_fd >= 0); - - if (!bus->output_io_event_source) { - r = sd_event_add_io(bus->event, &bus->output_io_event_source, bus->output_fd, 0, io_callback, bus); - if (r < 0) - return r; - - r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority); - if (r < 0) - return r; - - r = sd_event_source_set_description(bus->input_io_event_source, "bus-output"); - } else - r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd); - - if (r < 0) - 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); - - 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) - return r; - } - - bus->event_priority = priority; - - r = sd_event_add_time(bus->event, &bus->time_event_source, CLOCK_MONOTONIC, 0, 0, time_callback, bus); - if (r < 0) - goto fail; - - r = sd_event_source_set_priority(bus->time_event_source, priority); - if (r < 0) - goto fail; - - r = sd_event_source_set_description(bus->time_event_source, "bus-time"); - if (r < 0) - goto fail; - - r = sd_event_add_exit(bus->event, &bus->quit_event_source, quit_callback, bus); - if (r < 0) - goto fail; - - r = sd_event_source_set_description(bus->quit_event_source, "bus-exit"); - if (r < 0) - goto fail; - - r = attach_io_events(bus); - if (r < 0) - goto fail; - - return 0; - -fail: - sd_bus_detach_event(bus); - return r; -} - -_public_ int sd_bus_detach_event(sd_bus *bus) { - assert_return(bus, -EINVAL); - - if (!bus->event) - return 0; - - detach_io_events(bus); - - 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); - } - - 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_message(sd_bus *bus) { - assert_return(bus, NULL); - - return bus->current_message; -} - -_public_ sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus) { - assert_return(bus, NULL); - - return bus->current_slot; -} - -_public_ sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus) { - assert_return(bus, NULL); - - return bus->current_handler; -} - -_public_ void* sd_bus_get_current_userdata(sd_bus *bus) { - assert_return(bus, NULL); - - return bus->current_userdata; -} - -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) { - return bus_default(sd_bus_open_system, &default_system_bus, ret); -} - - -_public_ int sd_bus_default_user(sd_bus **ret) { - return bus_default(sd_bus_open_user, &default_user_bus, ret); -} - -_public_ int sd_bus_default(sd_bus **ret) { - - const char *e; - - /* Let's try our best to reuse another cached connection. If - * the starter bus type is set, connect via our normal - * connection logic, ignoring $DBUS_STARTER_ADDRESS, so that - * we can share the connection with the user/system default - * bus. */ - - e = secure_getenv("DBUS_STARTER_BUS_TYPE"); - if (e) { - if (streq(e, "system")) - return sd_bus_default_system(ret); - else if (STR_IN_SET(e, "user", "session")) - return sd_bus_default_user(ret); - } - - /* No type is specified, so we have not other option than to - * use the starter address if it is set. */ - - e = secure_getenv("DBUS_STARTER_ADDRESS"); - if (e) { - - return bus_default(sd_bus_open, &default_starter_bus, ret); - } - - /* Finally, if nothing is set use the cached connection for - * the right scope */ - - if (cg_pid_get_owner_uid(0, NULL) >= 0) - return sd_bus_default_user(ret); - else - return sd_bus_default_system(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_ int sd_bus_path_encode(const char *prefix, const char *external_id, char **ret_path) { - _cleanup_free_ char *e = NULL; - char *ret; - - assert_return(object_path_is_valid(prefix), -EINVAL); - assert_return(external_id, -EINVAL); - assert_return(ret_path, -EINVAL); - - e = bus_label_escape(external_id); - if (!e) - return -ENOMEM; - - ret = strjoin(prefix, "/", e, NULL); - if (!ret) - return -ENOMEM; - - *ret_path = ret; - return 0; -} - -_public_ int sd_bus_path_decode(const char *path, const char *prefix, char **external_id) { - const char *e; - char *ret; - - assert_return(object_path_is_valid(path), -EINVAL); - assert_return(object_path_is_valid(prefix), -EINVAL); - assert_return(external_id, -EINVAL); - - e = object_path_startswith(path, prefix); - if (!e) { - *external_id = NULL; - return 0; - } - - ret = bus_label_unescape(e); - if (!ret) - return -ENOMEM; - - *external_id = ret; - return 1; -} - -_public_ int sd_bus_path_encode_many(char **out, const char *path_template, ...) { - _cleanup_strv_free_ char **labels = NULL; - char *path, *path_pos, **label_pos; - const char *sep, *template_pos; - size_t path_length; - va_list list; - int r; - - assert_return(out, -EINVAL); - assert_return(path_template, -EINVAL); - - path_length = strlen(path_template); - - va_start(list, path_template); - for (sep = strchr(path_template, '%'); sep; sep = strchr(sep + 1, '%')) { - const char *arg; - char *label; - - arg = va_arg(list, const char *); - if (!arg) { - va_end(list); - return -EINVAL; - } - - label = bus_label_escape(arg); - if (!label) { - va_end(list); - return -ENOMEM; - } - - r = strv_consume(&labels, label); - if (r < 0) { - va_end(list); - return r; - } - - /* add label length, but account for the format character */ - path_length += strlen(label) - 1; - } - va_end(list); - - path = malloc(path_length + 1); - if (!path) - return -ENOMEM; - - path_pos = path; - label_pos = labels; - - for (template_pos = path_template; *template_pos; ) { - sep = strchrnul(template_pos, '%'); - path_pos = mempcpy(path_pos, template_pos, sep - template_pos); - if (!*sep) - break; - - path_pos = stpcpy(path_pos, *label_pos++); - template_pos = sep + 1; - } - - *path_pos = 0; - *out = path; - return 0; -} - -_public_ int sd_bus_path_decode_many(const char *path, const char *path_template, ...) { - _cleanup_strv_free_ char **labels = NULL; - const char *template_pos, *path_pos; - char **label_pos; - va_list list; - int r; - - /* - * This decodes an object-path based on a template argument. The - * template consists of a verbatim path, optionally including special - * directives: - * - * - Each occurrence of '%' in the template matches an arbitrary - * substring of a label in the given path. At most one such - * directive is allowed per label. For each such directive, the - * caller must provide an output parameter (char **) via va_arg. If - * NULL is passed, the given label is verified, but not returned. - * For each matched label, the *decoded* label is stored in the - * passed output argument, and the caller is responsible to free - * it. Note that the output arguments are only modified if the - * actualy path matched the template. Otherwise, they're left - * untouched. - * - * This function returns <0 on error, 0 if the path does not match the - * template, 1 if it matched. - */ - - assert_return(path, -EINVAL); - assert_return(path_template, -EINVAL); - - path_pos = path; - - for (template_pos = path_template; *template_pos; ) { - const char *sep; - size_t length; - char *label; - - /* verify everything until the next '%' matches verbatim */ - sep = strchrnul(template_pos, '%'); - length = sep - template_pos; - if (strncmp(path_pos, template_pos, length)) - return 0; - - path_pos += length; - template_pos += length; - - if (!*template_pos) - break; - - /* We found the next '%' character. Everything up until here - * matched. We now skip ahead to the end of this label and make - * sure it matches the tail of the label in the path. Then we - * decode the string in-between and save it for later use. */ - - ++template_pos; /* skip over '%' */ - - sep = strchrnul(template_pos, '/'); - length = sep - template_pos; /* length of suffix to match verbatim */ - - /* verify the suffixes match */ - sep = strchrnul(path_pos, '/'); - if (sep - path_pos < (ssize_t)length || - strncmp(sep - length, template_pos, length)) - return 0; - - template_pos += length; /* skip over matched label */ - length = sep - path_pos - length; /* length of sub-label to decode */ - - /* store unescaped label for later use */ - label = bus_label_unescape_n(path_pos, length); - if (!label) - return -ENOMEM; - - r = strv_consume(&labels, label); - if (r < 0) - return r; - - path_pos = sep; /* skip decoded label and suffix */ - } - - /* end of template must match end of path */ - if (*path_pos) - return 0; - - /* copy the labels over to the caller */ - va_start(list, path_template); - for (label_pos = labels; label_pos && *label_pos; ++label_pos) { - char **arg; - - arg = va_arg(list, char **); - if (arg) - *arg = *label_pos; - else - free(*label_pos); - } - va_end(list); - - free(labels); - labels = NULL; - return 1; -} - -_public_ int sd_bus_try_close(sd_bus *bus) { - int r; - - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (!bus->is_kernel) - return -EOPNOTSUPP; - - if (!BUS_IS_OPEN(bus->state)) - return -ENOTCONN; - - 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; -} - -_public_ int sd_bus_get_description(sd_bus *bus, const char **description) { - assert_return(bus, -EINVAL); - assert_return(description, -EINVAL); - assert_return(bus->description, -ENXIO); - assert_return(!bus_pid_changed(bus), -ECHILD); - - *description = bus->description; - return 0; -} - -int bus_get_root_path(sd_bus *bus) { - int r; - - if (bus->cgroup_root) - return 0; - - r = cg_get_root_path(&bus->cgroup_root); - if (r == -ENOENT) { - bus->cgroup_root = strdup("/"); - if (!bus->cgroup_root) - return -ENOMEM; - - r = 0; - } - - return r; -} - -_public_ int sd_bus_get_scope(sd_bus *bus, const char **scope) { - int r; - - assert_return(bus, -EINVAL); - assert_return(scope, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (bus->is_kernel) { - _cleanup_free_ char *n = NULL; - const char *dash; - - r = bus_kernel_get_bus_name(bus, &n); - if (r < 0) - return r; - - if (streq(n, "0-system")) { - *scope = "system"; - return 0; - } - - dash = strchr(n, '-'); - if (streq_ptr(dash, "-user")) { - *scope = "user"; - return 0; - } - } - - if (bus->is_user) { - *scope = "user"; - return 0; - } - - if (bus->is_system) { - *scope = "system"; - return 0; - } - - return -ENODATA; -} - -_public_ int sd_bus_get_address(sd_bus *bus, const char **address) { - - assert_return(bus, -EINVAL); - assert_return(address, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - if (bus->address) { - *address = bus->address; - return 0; - } - - return -ENODATA; -} - -_public_ int sd_bus_get_creds_mask(sd_bus *bus, uint64_t *mask) { - assert_return(bus, -EINVAL); - assert_return(mask, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - *mask = bus->creds_mask; - return 0; -} - -_public_ int sd_bus_is_bus_client(sd_bus *bus) { - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - return bus->bus_client; -} - -_public_ int sd_bus_is_server(sd_bus *bus) { - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - return bus->is_server; -} - -_public_ int sd_bus_is_anonymous(sd_bus *bus) { - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - return bus->anonymous_auth; -} - -_public_ int sd_bus_is_trusted(sd_bus *bus) { - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - return bus->trusted; -} - -_public_ int sd_bus_is_monitor(sd_bus *bus) { - assert_return(bus, -EINVAL); - assert_return(!bus_pid_changed(bus), -ECHILD); - - return !!(bus->hello_flags & KDBUS_HELLO_MONITOR); -} - -static void flush_close(sd_bus *bus) { - if (!bus) - return; - - /* Flushes and closes the specified bus. We take a ref before, - * to ensure the flushing does not cause the bus to be - * unreferenced. */ - - sd_bus_flush_close_unref(sd_bus_ref(bus)); -} - -_public_ void sd_bus_default_flush_close(void) { - flush_close(default_starter_bus); - flush_close(default_user_bus); - flush_close(default_system_bus); -} - -_public_ int sd_bus_set_exit_on_disconnect(sd_bus *bus, int b) { - assert_return(bus, -EINVAL); - - /* Turns on exit-on-disconnect, and triggers it immediately if the bus connection was already - * disconnected. Note that this is triggered exclusively on disconnections triggered by the server side, never - * from the client side. */ - bus->exit_on_disconnect = b; - - /* If the exit condition was triggered already, exit immediately. */ - return bus_exit_now(bus); -} - -_public_ int sd_bus_get_exit_on_disconnect(sd_bus *bus) { - assert_return(bus, -EINVAL); - - return bus->exit_on_disconnect; -} |