| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| 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 <assert.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <netdb.h> |
| #include <sys/poll.h> |
| #include <byteswap.h> |
| #include <sys/mman.h> |
| #include <pthread.h> |
| |
| #include "util.h" |
| #include "macro.h" |
| #include "strv.h" |
| #include "set.h" |
| #include "missing.h" |
| |
| #include "sd-bus.h" |
| #include "bus-internal.h" |
| #include "bus-message.h" |
| #include "bus-type.h" |
| #include "bus-socket.h" |
| #include "bus-kernel.h" |
| #include "bus-control.h" |
| |
| static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec); |
| |
| static void bus_close_fds(sd_bus *b) { |
| assert(b); |
| |
| if (b->input_fd >= 0) |
| close_nointr_nofail(b->input_fd); |
| |
| if (b->output_fd >= 0 && b->output_fd != b->input_fd) |
| close_nointr_nofail(b->output_fd); |
| |
| b->input_fd = b->output_fd = -1; |
| } |
| |
| static void bus_free(sd_bus *b) { |
| struct filter_callback *f; |
| struct object_callback *c; |
| unsigned i; |
| |
| assert(b); |
| |
| bus_close_fds(b); |
| |
| if (b->kdbus_buffer) |
| munmap(b->kdbus_buffer, KDBUS_POOL_SIZE); |
| |
| free(b->rbuffer); |
| free(b->unique_name); |
| free(b->auth_buffer); |
| free(b->address); |
| free(b->kernel); |
| |
| free(b->exec_path); |
| strv_free(b->exec_argv); |
| |
| 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); |
| |
| hashmap_free_free(b->reply_callbacks); |
| prioq_free(b->reply_callbacks_prioq); |
| |
| while ((f = b->filter_callbacks)) { |
| LIST_REMOVE(struct filter_callback, callbacks, b->filter_callbacks, f); |
| free(f); |
| } |
| |
| while ((c = hashmap_steal_first(b->object_callbacks))) { |
| free(c->path); |
| free(c); |
| } |
| |
| hashmap_free(b->object_callbacks); |
| bus_match_free(&b->match_callbacks); |
| |
| bus_kernel_flush_memfd(b); |
| |
| assert_se(pthread_mutex_destroy(&b->memfd_cache_mutex) == 0); |
| |
| free(b); |
| } |
| |
| int sd_bus_new(sd_bus **ret) { |
| sd_bus *r; |
| |
| if (!ret) |
| return -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->hello_flags |= KDBUS_HELLO_ACCEPT_FD; |
| 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) { |
| free(r); |
| return -ENOMEM; |
| } |
| |
| *ret = r; |
| return 0; |
| } |
| |
| int sd_bus_set_address(sd_bus *bus, const char *address) { |
| char *a; |
| |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (!address) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| a = strdup(address); |
| if (!a) |
| return -ENOMEM; |
| |
| free(bus->address); |
| bus->address = a; |
| |
| return 0; |
| } |
| |
| int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (input_fd < 0) |
| return -EINVAL; |
| if (output_fd < 0) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| bus->input_fd = input_fd; |
| bus->output_fd = output_fd; |
| return 0; |
| } |
| |
| int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]) { |
| char *p, **a; |
| |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (!path) |
| return -EINVAL; |
| if (strv_isempty(argv)) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| 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; |
| } |
| |
| int sd_bus_set_bus_client(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| bus->bus_client = !!b; |
| return 0; |
| } |
| |
| int sd_bus_negotiate_fds(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ACCEPT_FD, b); |
| return 0; |
| } |
| |
| int sd_bus_negotiate_attach_comm(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_COMM, b); |
| return 0; |
| } |
| |
| int sd_bus_negotiate_attach_exe(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_EXE, b); |
| return 0; |
| } |
| |
| int sd_bus_negotiate_attach_cmdline(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_CMDLINE, b); |
| return 0; |
| } |
| |
| int sd_bus_negotiate_attach_cgroup(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_CGROUP, b); |
| return 0; |
| } |
| |
| int sd_bus_negotiate_attach_caps(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_CAPS, b); |
| return 0; |
| } |
| |
| int sd_bus_negotiate_attach_selinux_context(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_SECLABEL, b); |
| return 0; |
| } |
| |
| int sd_bus_negotiate_attach_audit(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| SET_FLAG(bus->hello_flags, KDBUS_HELLO_ATTACH_AUDIT, b); |
| return 0; |
| } |
| |
| int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t server_id) { |
| if (!bus) |
| return -EINVAL; |
| if (!b && !sd_id128_equal(server_id, SD_ID128_NULL)) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| bus->is_server = !!b; |
| bus->server_id = server_id; |
| return 0; |
| } |
| |
| int sd_bus_set_anonymous(sd_bus *bus, int b) { |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| bus->anonymous_auth = !!b; |
| return 0; |
| } |
| |
| static int hello_callback(sd_bus *bus, sd_bus_message *reply, void *userdata) { |
| const char *s; |
| int r; |
| |
| assert(bus); |
| assert(bus->state == BUS_HELLO); |
| assert(reply); |
| |
| r = bus_message_to_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; |
| |
| bus->state = BUS_RUNNING; |
| |
| return 1; |
| } |
| |
| static int bus_send_hello(sd_bus *bus) { |
| _cleanup_bus_message_unref_ 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, |
| "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); |
| } |
| |
| 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; |
| 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, *t; |
| |
| 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++; |
| } |
| |
| t = realloc(r, n + 2); |
| if (!t) { |
| free(r); |
| return -ENOMEM; |
| } |
| |
| r = t; |
| 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; |
| 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) { |
| char **x; |
| |
| x = realloc(argv, sizeof(char*) * (ul + 2)); |
| if (!x) { |
| r = -ENOMEM; |
| goto fail; |
| } |
| |
| memset(x + n_argv, 0, sizeof(char*) * (ul - n_argv + 2)); |
| |
| argv = x; |
| 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 void bus_reset_parsed_address(sd_bus *b) { |
| assert(b); |
| |
| zero(b->sockaddr); |
| b->sockaddr_size = 0; |
| strv_free(b->exec_argv); |
| free(b->exec_path); |
| b->exec_path = NULL; |
| b->exec_argv = NULL; |
| b->server_id = SD_ID128_NULL; |
| free(b->kernel); |
| b->kernel = NULL; |
| } |
| |
| 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; |
| } |
| |
| 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) { |
| int r; |
| |
| 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; |
| |
| } else if (b->exec_path) { |
| |
| r = bus_socket_exec(b); |
| if (r >= 0) |
| return r; |
| |
| b->last_connect_error = -r; |
| } else if (b->kernel) { |
| |
| r = bus_kernel_connect(b); |
| if (r >= 0) |
| return r; |
| |
| 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); |
| } |
| |
| int sd_bus_start(sd_bus *bus) { |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (bus->state != BUS_UNSET) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| 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) |
| r = bus_start_address(bus); |
| else |
| return -EINVAL; |
| |
| if (r < 0) |
| return r; |
| |
| return bus_send_hello(bus); |
| } |
| |
| int sd_bus_open_system(sd_bus **ret) { |
| const char *e; |
| sd_bus *b; |
| int r; |
| |
| if (!ret) |
| return -EINVAL; |
| |
| r = sd_bus_new(&b); |
| if (r < 0) |
| return r; |
| |
| e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS"); |
| 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; |
| } |
| |
| b->bus_client = true; |
| |
| r = sd_bus_start(b); |
| if (r < 0) |
| goto fail; |
| |
| *ret = b; |
| return 0; |
| |
| fail: |
| bus_free(b); |
| return r; |
| } |
| |
| int sd_bus_open_user(sd_bus **ret) { |
| const char *e; |
| sd_bus *b; |
| size_t l; |
| int r; |
| |
| if (!ret) |
| return -EINVAL; |
| |
| r = sd_bus_new(&b); |
| if (r < 0) |
| return r; |
| |
| e = secure_getenv("DBUS_SESSION_BUS_ADDRESS"); |
| if (e) { |
| r = sd_bus_set_address(b, e); |
| if (r < 0) |
| goto fail; |
| } else { |
| e = secure_getenv("XDG_RUNTIME_DIR"); |
| if (!e) { |
| r = -ENOENT; |
| goto fail; |
| } |
| |
| l = strlen(e); |
| if (l + 4 > sizeof(b->sockaddr.un.sun_path)) { |
| r = -E2BIG; |
| 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; |
| |
| r = sd_bus_start(b); |
| if (r < 0) |
| goto fail; |
| |
| *ret = b; |
| return 0; |
| |
| fail: |
| bus_free(b); |
| return r; |
| } |
| |
| 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; |
| |
| 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. */ |
| } |
| |
| sd_bus *sd_bus_ref(sd_bus *bus) { |
| if (!bus) |
| return NULL; |
| |
| assert_se(REFCNT_INC(bus->n_ref) >= 2); |
| |
| return bus; |
| } |
| |
| sd_bus *sd_bus_unref(sd_bus *bus) { |
| if (!bus) |
| return NULL; |
| |
| if (REFCNT_DEC(bus->n_ref) <= 0) |
| bus_free(bus); |
| |
| return NULL; |
| } |
| |
| int sd_bus_is_open(sd_bus *bus) { |
| if (!bus) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| return BUS_IS_OPEN(bus->state); |
| } |
| |
| int sd_bus_can_send(sd_bus *bus, char type) { |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (bus->state == BUS_UNSET) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| 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); |
| } |
| |
| int sd_bus_get_server_id(sd_bus *bus, sd_id128_t *server_id) { |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!server_id) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = bus_ensure_running(bus); |
| if (r < 0) |
| return r; |
| |
| *server_id = bus->server_id; |
| return 0; |
| } |
| |
| static int bus_seal_message(sd_bus *b, sd_bus_message *m) { |
| assert(m); |
| |
| if (m->header->version > b->message_version) |
| return -EPERM; |
| |
| if (m->sealed) |
| return 0; |
| |
| return bus_message_seal(m, ++b->serial); |
| } |
| |
| 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) { |
| |
| if (bus->is_kernel) |
| r = bus_kernel_write_message(bus, bus->wqueue[0]); |
| else |
| r = bus_socket_write_message(bus, bus->wqueue[0], &bus->windex); |
| |
| if (r < 0) { |
| sd_bus_close(bus); |
| 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. */ |
| |
| sd_bus_message_unref(bus->wqueue[0]); |
| bus->wqueue_size --; |
| memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size); |
| bus->windex = 0; |
| |
| ret = 1; |
| } |
| } |
| |
| return ret; |
| } |
| |
| 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; |
| } |
| |
| /* 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); |
| |
| if (r < 0) { |
| sd_bus_close(bus); |
| return r; |
| } |
| if (r == 0) |
| return ret; |
| |
| r = 1; |
| } while (!z); |
| |
| *m = z; |
| return 1; |
| } |
| |
| int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (!m) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| 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 -ENOTSUP; |
| } |
| |
| /* If the serial 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; |
| |
| r = bus_seal_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) |
| return 0; |
| |
| 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); |
| |
| if (r < 0) { |
| sd_bus_close(bus); |
| return r; |
| } else 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 { |
| 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) |
| return -ENOMEM; |
| |
| bus->wqueue = q; |
| q[bus->wqueue_size ++] = sd_bus_message_ref(m); |
| } |
| |
| if (serial) |
| *serial = BUS_MESSAGE_SERIAL(m); |
| |
| return 0; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| int sd_bus_send_with_reply( |
| sd_bus *bus, |
| sd_bus_message *m, |
| sd_bus_message_handler_t callback, |
| void *userdata, |
| uint64_t usec, |
| uint64_t *serial) { |
| |
| struct reply_callback *c; |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (!m) |
| return -EINVAL; |
| if (!callback) |
| return -EINVAL; |
| if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
| return -EINVAL; |
| if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func); |
| 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 = bus_seal_message(bus, m); |
| if (r < 0) |
| return r; |
| |
| c = new0(struct reply_callback, 1); |
| if (!c) |
| return -ENOMEM; |
| |
| c->callback = callback; |
| c->userdata = userdata; |
| c->serial = BUS_MESSAGE_SERIAL(m); |
| c->timeout = calc_elapse(usec); |
| |
| r = hashmap_put(bus->reply_callbacks, &c->serial, c); |
| if (r < 0) { |
| free(c); |
| return r; |
| } |
| |
| if (c->timeout != 0) { |
| 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); |
| return r; |
| } |
| } |
| |
| r = sd_bus_send(bus, m, serial); |
| if (r < 0) { |
| sd_bus_send_with_reply_cancel(bus, c->serial); |
| return r; |
| } |
| |
| return r; |
| } |
| |
| int sd_bus_send_with_reply_cancel(sd_bus *bus, uint64_t serial) { |
| struct reply_callback *c; |
| |
| if (!bus) |
| return -EINVAL; |
| if (serial == 0) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| c = hashmap_remove(bus->reply_callbacks, &serial); |
| if (!c) |
| return 0; |
| |
| if (c->timeout != 0) |
| prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); |
| |
| free(c); |
| return 1; |
| } |
| |
| int bus_ensure_running(sd_bus *bus) { |
| int r; |
| |
| assert(bus); |
| |
| if (bus->state == BUS_UNSET || bus->state == BUS_CLOSED) |
| 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; |
| } |
| } |
| |
| int sd_bus_send_with_reply_and_block( |
| sd_bus *bus, |
| sd_bus_message *m, |
| uint64_t usec, |
| sd_bus_error *error, |
| sd_bus_message **reply) { |
| |
| int r; |
| usec_t timeout; |
| uint64_t serial; |
| bool room = false; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (!m) |
| return -EINVAL; |
| if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
| return -EINVAL; |
| if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
| return -EINVAL; |
| if (bus_error_is_dirty(error)) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = bus_ensure_running(bus); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_send(bus, m, &serial); |
| if (r < 0) |
| return r; |
| |
| timeout = calc_elapse(usec); |
| |
| for (;;) { |
| usec_t left; |
| sd_bus_message *incoming = NULL; |
| |
| if (!room) { |
| sd_bus_message **q; |
| |
| if (bus->rqueue_size >= BUS_RQUEUE_MAX) |
| return -ENOBUFS; |
| |
| /* Make sure there's room for queuing this |
| * locally, before we read the message */ |
| |
| q = realloc(bus->rqueue, (bus->rqueue_size + 1) * sizeof(sd_bus_message*)); |
| if (!q) |
| return -ENOMEM; |
| |
| bus->rqueue = q; |
| room = true; |
| } |
| |
| if (bus->is_kernel) |
| r = bus_kernel_read_message(bus, &incoming); |
| else |
| r = bus_socket_read_message(bus, &incoming); |
| if (r < 0) |
| return r; |
| if (incoming) { |
| |
| if (incoming->reply_serial == serial) { |
| /* Found a match! */ |
| |
| if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN) { |
| |
| if (reply) |
| *reply = incoming; |
| else |
| sd_bus_message_unref(incoming); |
| |
| return 0; |
| } |
| |
| if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) { |
| int k; |
| |
| r = sd_bus_error_copy(error, &incoming->error); |
| if (r < 0) { |
| sd_bus_message_unref(incoming); |
| return r; |
| } |
| |
| k = bus_error_to_errno(&incoming->error); |
| sd_bus_message_unref(incoming); |
| return k; |
| } |
| |
| sd_bus_message_unref(incoming); |
| return -EIO; |
| } |
| |
| /* 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; |
| } |
| if (r != 0) |
| continue; |
| |
| if (timeout > 0) { |
| usec_t n; |
| |
| n = now(CLOCK_MONOTONIC); |
| if (n >= timeout) |
| return -ETIMEDOUT; |
| |
| left = timeout - n; |
| } else |
| left = (uint64_t) -1; |
| |
| r = bus_poll(bus, true, left); |
| if (r < 0) |
| return r; |
| |
| r = dispatch_wqueue(bus); |
| if (r < 0) |
| return r; |
| } |
| } |
| |
| int sd_bus_get_fd(sd_bus *bus) { |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus->input_fd != bus->output_fd) |
| return -EPERM; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| return bus->input_fd; |
| } |
| |
| int sd_bus_get_events(sd_bus *bus) { |
| int flags = 0; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| 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; |
| } |
| |
| int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { |
| struct reply_callback *c; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!timeout_usec) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| 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; |
| } |
| |
| c = prioq_peek(bus->reply_callbacks_prioq); |
| if (!c) { |
| *timeout_usec = (uint64_t) -1; |
| return 0; |
| } |
| |
| *timeout_usec = c->timeout; |
| return 1; |
| } |
| |
| static int process_timeout(sd_bus *bus) { |
| _cleanup_bus_message_unref_ sd_bus_message* m = NULL; |
| struct reply_callback *c; |
| 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->serial, |
| &SD_BUS_ERROR_MAKE("org.freedesktop.DBus.Error.Timeout", "Timed out"), |
| &m); |
| if (r < 0) |
| return r; |
| |
| assert_se(prioq_pop(bus->reply_callbacks_prioq) == c); |
| hashmap_remove(bus->reply_callbacks, &c->serial); |
| |
| r = c->callback(bus, m, c->userdata); |
| free(c); |
| |
| return r < 0 ? r : 1; |
| } |
| |
| 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_TYPE_METHOD_RETURN && |
| m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR) |
| return -EIO; |
| |
| if (m->reply_serial != bus->hello_serial) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int process_reply(sd_bus *bus, sd_bus_message *m) { |
| struct reply_callback *c; |
| int r; |
| |
| assert(bus); |
| assert(m); |
| |
| if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_RETURN && |
| m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_ERROR) |
| return 0; |
| |
| c = hashmap_remove(bus->reply_callbacks, &m->reply_serial); |
| if (!c) |
| return 0; |
| |
| if (c->timeout != 0) |
| prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); |
| |
| r = sd_bus_message_rewind(m, true); |
| if (r < 0) |
| return r; |
| |
| r = c->callback(bus, m, c->userdata); |
| free(c); |
| |
| return r; |
| } |
| |
| static int process_filter(sd_bus *bus, sd_bus_message *m) { |
| struct filter_callback *l; |
| int r; |
| |
| assert(bus); |
| assert(m); |
| |
| do { |
| bus->filter_callbacks_modified = false; |
| |
| LIST_FOREACH(callbacks, l, bus->filter_callbacks) { |
| |
| 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; |
| |
| r = l->callback(bus, m, l->userdata); |
| 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_bus_message_unref_ sd_bus_message *reply = NULL; |
| int r; |
| |
| assert(bus); |
| assert(m); |
| |
| if (m->header->type != SD_BUS_MESSAGE_TYPE_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) |
| return 1; |
| |
| if (streq_ptr(m->member, "Ping")) |
| r = sd_bus_message_new_method_return(bus, 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(bus, m, &reply); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid)); |
| } else { |
| _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
| |
| sd_bus_error_set(&error, |
| "org.freedesktop.DBus.Error.UnknownMethod", |
| "Unknown method '%s' on interface '%s'.", m->member, m->interface); |
| |
| r = sd_bus_message_new_method_error(bus, m, &error, &reply); |
| } |
| |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_send(bus, reply, NULL); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int process_object(sd_bus *bus, sd_bus_message *m) { |
| _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
| _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; |
| struct object_callback *c; |
| int r; |
| bool found = false; |
| size_t pl; |
| |
| assert(bus); |
| assert(m); |
| |
| if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
| return 0; |
| |
| if (hashmap_isempty(bus->object_callbacks)) |
| return 0; |
| |
| pl = strlen(m->path); |
| |
| do { |
| char p[pl+1]; |
| |
| bus->object_callbacks_modified = false; |
| |
| c = hashmap_get(bus->object_callbacks, m->path); |
| if (c && c->last_iteration != bus->iteration_counter) { |
| |
| c->last_iteration = bus->iteration_counter; |
| |
| r = sd_bus_message_rewind(m, true); |
| if (r < 0) |
| return r; |
| |
| r = c->callback(bus, m, c->userdata); |
| if (r != 0) |
| return r; |
| |
| found = true; |
| } |
| |
| /* Look for fallback prefixes */ |
| strcpy(p, m->path); |
| for (;;) { |
| char *e; |
| |
| if (bus->object_callbacks_modified) |
| break; |
| |
| e = strrchr(p, '/'); |
| if (e == p || !e) |
| break; |
| |
| *e = 0; |
| |
| c = hashmap_get(bus->object_callbacks, p); |
| if (c && c->last_iteration != bus->iteration_counter && c->is_fallback) { |
| |
| c->last_iteration = bus->iteration_counter; |
| |
| r = sd_bus_message_rewind(m, true); |
| if (r < 0) |
| return r; |
| |
| r = c->callback(bus, m, c->userdata); |
| if (r != 0) |
| return r; |
| |
| found = true; |
| } |
| } |
| |
| } while (bus->object_callbacks_modified); |
| |
| /* We found some handlers but none wanted to take this, then |
| * return this -- with one exception, we can handle |
| * introspection minimally ourselves */ |
| if (!found || sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) |
| return 0; |
| |
| sd_bus_error_set(&error, |
| "org.freedesktop.DBus.Error.UnknownMethod", |
| "Unknown method '%s' or interface '%s'.", m->member, m->interface); |
| |
| r = sd_bus_message_new_method_error(bus, m, &error, &reply); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_send(bus, reply, NULL); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int process_introspect(sd_bus *bus, sd_bus_message *m) { |
| _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; |
| _cleanup_free_ char *introspection = NULL; |
| _cleanup_set_free_free_ Set *s = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| struct object_callback *c; |
| Iterator i; |
| size_t size = 0; |
| char *node; |
| int r; |
| |
| assert(bus); |
| assert(m); |
| |
| if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Introspectable", "Introspect")) |
| return 0; |
| |
| if (!m->path) |
| return 0; |
| |
| s = set_new(string_hash_func, string_compare_func); |
| if (!s) |
| return -ENOMEM; |
| |
| HASHMAP_FOREACH(c, bus->object_callbacks, i) { |
| const char *e; |
| char *a, *p; |
| |
| if (streq(c->path, "/")) |
| continue; |
| |
| if (streq(m->path, "/")) |
| e = c->path; |
| else { |
| e = startswith(c->path, m->path); |
| if (!e || *e != '/') |
| continue; |
| } |
| |
| a = strdup(e+1); |
| if (!a) |
| return -ENOMEM; |
| |
| p = strchr(a, '/'); |
| if (p) |
| *p = 0; |
| |
| r = set_consume(s, a); |
| if (r < 0 && r != -EEXIST) |
| return r; |
| } |
| |
| f = open_memstream(&introspection, &size); |
| if (!f) |
| return -ENOMEM; |
| |
| fputs(SD_BUS_INTROSPECT_DOCTYPE, f); |
| fputs("<node>\n", f); |
| fputs(SD_BUS_INTROSPECT_INTERFACE_PEER, f); |
| fputs(SD_BUS_INTROSPECT_INTERFACE_INTROSPECTABLE, f); |
| |
| while ((node = set_steal_first(s))) { |
| fprintf(f, " <node name=\"%s\"/>\n", node); |
| free(node); |
| } |
| |
| fputs("</node>\n", f); |
| |
| fflush(f); |
| |
| if (ferror(f)) |
| return -ENOMEM; |
| |
| r = sd_bus_message_new_method_return(bus, m, &reply); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_message_append(reply, "s", introspection); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_send(bus, reply, NULL); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int process_message(sd_bus *bus, sd_bus_message *m) { |
| int r; |
| |
| assert(bus); |
| assert(m); |
| |
| bus->iteration_counter++; |
| |
| r = process_hello(bus, m); |
| if (r != 0) |
| return r; |
| |
| r = process_reply(bus, m); |
| if (r != 0) |
| return r; |
| |
| r = process_filter(bus, m); |
| if (r != 0) |
| return r; |
| |
| r = process_match(bus, m); |
| if (r != 0) |
| return r; |
| |
| r = process_builtin(bus, m); |
| if (r != 0) |
| return r; |
| |
| r = process_object(bus, m); |
| if (r != 0) |
| return r; |
| |
| return process_introspect(bus, m); |
| } |
| |
| static int process_running(sd_bus *bus, sd_bus_message **ret) { |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| int r; |
| |
| assert(bus); |
| assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
| |
| r = process_timeout(bus); |
| if (r != 0) |
| goto null_message; |
| |
| r = dispatch_wqueue(bus); |
| if (r != 0) |
| goto null_message; |
| |
| r = dispatch_rqueue(bus, &m); |
| if (r < 0) |
| return r; |
| if (!m) |
| goto null_message; |
| |
| r = process_message(bus, m); |
| if (r != 0) |
| goto null_message; |
| |
| if (ret) { |
| r = sd_bus_message_rewind(m, true); |
| if (r < 0) |
| return r; |
| |
| *ret = m; |
| m = NULL; |
| return 1; |
| } |
| |
| if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL) { |
| _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; |
| _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
| |
| sd_bus_error_set(&error, "org.freedesktop.DBus.Error.UnknownObject", "Unknown object '%s'.", m->path); |
| |
| r = sd_bus_message_new_method_error(bus, m, &error, &reply); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_send(bus, reply, NULL); |
| if (r < 0) |
| return r; |
| } |
| |
| return 1; |
| |
| null_message: |
| if (r >= 0 && ret) |
| *ret = NULL; |
| |
| return r; |
| } |
| |
| int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { |
| int r; |
| |
| /* Returns 0 when we didn't do anything. This should cause the |
| * caller to invoke sd_bus_wait() before returning the next |
| * time. Returns > 0 when we did something, which possibly |
| * means *ret is filled in with an unprocessed message. */ |
| |
| if (!bus) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| /* We don't allow recursively invoking sd_bus_process(). */ |
| if (bus->processing) |
| return -EBUSY; |
| |
| switch (bus->state) { |
| |
| case BUS_UNSET: |
| case BUS_CLOSED: |
| return -ENOTCONN; |
| |
| case BUS_OPENING: |
| r = bus_socket_process_opening(bus); |
| if (r < 0) |
| return r; |
| if (ret) |
| *ret = NULL; |
| return r; |
| |
| case BUS_AUTHENTICATING: |
| |
| r = bus_socket_process_authenticating(bus); |
| if (r < 0) |
| return r; |
| if (ret) |
| *ret = NULL; |
| return r; |
| |
| case BUS_RUNNING: |
| case BUS_HELLO: |
| |
| bus->processing = true; |
| r = process_running(bus, ret); |
| bus->processing = false; |
| |
| return r; |
| } |
| |
| assert_not_reached("Unknown state"); |
| } |
| |
| static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { |
| struct pollfd p[2] = {}; |
| int r, e, n; |
| struct timespec ts; |
| usec_t until, m; |
| |
| assert(bus); |
| |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| |
| e = sd_bus_get_events(bus); |
| if (e < 0) |
| return e; |
| |
| if (need_more) |
| e |= POLLIN; |
| |
| r = sd_bus_get_timeout(bus, &until); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| m = (uint64_t) -1; |
| else { |
| usec_t nw; |
| nw = now(CLOCK_MONOTONIC); |
| m = until > nw ? until - nw : 0; |
| } |
| |
| if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) |
| m = timeout_usec; |
| |
| p[0].fd = bus->input_fd; |
| if (bus->output_fd == bus->input_fd) { |
| p[0].events = e; |
| n = 1; |
| } else { |
| p[0].events = e & POLLIN; |
| p[1].fd = bus->output_fd; |
| p[1].events = e & POLLOUT; |
| n = 2; |
| } |
| |
| r = ppoll(p, n, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); |
| if (r < 0) |
| return -errno; |
| |
| return r > 0 ? 1 : 0; |
| } |
| |
| int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { |
| |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| if (bus->rqueue_size > 0) |
| return 0; |
| |
| return bus_poll(bus, false, timeout_usec); |
| } |
| |
| int sd_bus_flush(sd_bus *bus) { |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = bus_ensure_running(bus); |
| if (r < 0) |
| return r; |
| |
| if (bus->wqueue_size <= 0) |
| return 0; |
| |
| for (;;) { |
| r = dispatch_wqueue(bus); |
| if (r < 0) |
| return r; |
| |
| if (bus->wqueue_size <= 0) |
| return 0; |
| |
| r = bus_poll(bus, false, (uint64_t) -1); |
| if (r < 0) |
| return r; |
| } |
| } |
| |
| int sd_bus_add_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { |
| struct filter_callback *f; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!callback) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| f = new0(struct filter_callback, 1); |
| if (!f) |
| return -ENOMEM; |
| f->callback = callback; |
| f->userdata = userdata; |
| |
| bus->filter_callbacks_modified = true; |
| LIST_PREPEND(struct filter_callback, callbacks, bus->filter_callbacks, f); |
| return 0; |
| } |
| |
| int sd_bus_remove_filter(sd_bus *bus, sd_bus_message_handler_t callback, void *userdata) { |
| struct filter_callback *f; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!callback) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| LIST_FOREACH(callbacks, f, bus->filter_callbacks) { |
| if (f->callback == callback && f->userdata == userdata) { |
| bus->filter_callbacks_modified = true; |
| LIST_REMOVE(struct filter_callback, callbacks, bus->filter_callbacks, f); |
| free(f); |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int bus_add_object( |
| sd_bus *bus, |
| bool fallback, |
| const char *path, |
| sd_bus_message_handler_t callback, |
| void *userdata) { |
| |
| struct object_callback *c; |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!path) |
| return -EINVAL; |
| if (!callback) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = hashmap_ensure_allocated(&bus->object_callbacks, string_hash_func, string_compare_func); |
| if (r < 0) |
| return r; |
| |
| c = new0(struct object_callback, 1); |
| if (!c) |
| return -ENOMEM; |
| |
| c->path = strdup(path); |
| if (!c->path) { |
| free(c); |
| return -ENOMEM; |
| } |
| |
| c->callback = callback; |
| c->userdata = userdata; |
| c->is_fallback = fallback; |
| |
| bus->object_callbacks_modified = true; |
| r = hashmap_put(bus->object_callbacks, c->path, c); |
| if (r < 0) { |
| free(c->path); |
| free(c); |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int bus_remove_object( |
| sd_bus *bus, |
| bool fallback, |
| const char *path, |
| sd_bus_message_handler_t callback, |
| void *userdata) { |
| |
| struct object_callback *c; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!path) |
| return -EINVAL; |
| if (!callback) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| c = hashmap_get(bus->object_callbacks, path); |
| if (!c) |
| return 0; |
| |
| if (c->callback != callback || c->userdata != userdata || c->is_fallback != fallback) |
| return 0; |
| |
| bus->object_callbacks_modified = true; |
| assert_se(c == hashmap_remove(bus->object_callbacks, c->path)); |
| |
| free(c->path); |
| free(c); |
| |
| return 1; |
| } |
| |
| int sd_bus_add_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { |
| return bus_add_object(bus, false, path, callback, userdata); |
| } |
| |
| int sd_bus_remove_object(sd_bus *bus, const char *path, sd_bus_message_handler_t callback, void *userdata) { |
| return bus_remove_object(bus, false, path, callback, userdata); |
| } |
| |
| int sd_bus_add_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { |
| return bus_add_object(bus, true, prefix, callback, userdata); |
| } |
| |
| int sd_bus_remove_fallback(sd_bus *bus, const char *prefix, sd_bus_message_handler_t callback, void *userdata) { |
| return bus_remove_object(bus, true, prefix, callback, userdata); |
| } |
| |
| int sd_bus_add_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { |
| struct bus_match_component *components = NULL; |
| unsigned n_components = 0; |
| uint64_t cookie = 0; |
| int r = 0; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!match) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = bus_match_parse(match, &components, &n_components); |
| if (r < 0) |
| goto finish; |
| |
| if (bus->bus_client) { |
| cookie = ++bus->match_cookie; |
| |
| r = bus_add_match_internal(bus, match, components, n_components, cookie); |
| if (r < 0) |
| goto finish; |
| } |
| |
| bus->match_callbacks_modified = true; |
| r = bus_match_add(&bus->match_callbacks, components, n_components, callback, userdata, cookie, NULL); |
| if (r < 0) { |
| if (bus->bus_client) |
| bus_remove_match_internal(bus, match, cookie); |
| } |
| |
| finish: |
| bus_match_parse_free(components, n_components); |
| return r; |
| } |
| |
| int sd_bus_remove_match(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata) { |
| struct bus_match_component *components = NULL; |
| unsigned n_components = 0; |
| int r = 0, q = 0; |
| uint64_t cookie = 0; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!match) |
| return -EINVAL; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = bus_match_parse(match, &components, &n_components); |
| if (r < 0) |
| return r; |
| |
| bus->match_callbacks_modified = true; |
| r = bus_match_remove(&bus->match_callbacks, components, n_components, callback, userdata, &cookie); |
| |
| if (bus->bus_client) |
| q = bus_remove_match_internal(bus, match, cookie); |
| |
| bus_match_parse_free(components, n_components); |
| |
| return r < 0 ? r : q; |
| } |
| |
| int sd_bus_emit_signal( |
| sd_bus *bus, |
| const char *path, |
| const char *interface, |
| const char *member, |
| const char *types, ...) { |
| |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| va_list ap; |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = sd_bus_message_new_signal(bus, path, interface, member, &m); |
| if (r < 0) |
| return r; |
| |
| va_start(ap, types); |
| r = bus_message_append_ap(m, types, ap); |
| va_end(ap); |
| if (r < 0) |
| return r; |
| |
| return sd_bus_send(bus, m, NULL); |
| } |
| |
| int sd_bus_call_method( |
| sd_bus *bus, |
| const char *destination, |
| const char *path, |
| const char *interface, |
| const char *member, |
| sd_bus_error *error, |
| sd_bus_message **reply, |
| const char *types, ...) { |
| |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| va_list ap; |
| int r; |
| |
| if (!bus) |
| |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| r = sd_bus_message_new_method_call(bus, destination, path, interface, member, &m); |
| if (r < 0) |
| return r; |
| |
| va_start(ap, types); |
| r = bus_message_append_ap(m, types, ap); |
| va_end(ap); |
| if (r < 0) |
| return r; |
| |
| return sd_bus_send_with_reply_and_block(bus, m, 0, error, reply); |
| } |
| |
| int sd_bus_reply_method_return( |
| sd_bus *bus, |
| sd_bus_message *call, |
| const char *types, ...) { |
| |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| va_list ap; |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!call) |
| return -EINVAL; |
| if (!call->sealed) |
| return -EPERM; |
| if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
| return 0; |
| |
| r = sd_bus_message_new_method_return(bus, call, &m); |
| if (r < 0) |
| return r; |
| |
| va_start(ap, types); |
| r = bus_message_append_ap(m, types, ap); |
| va_end(ap); |
| if (r < 0) |
| return r; |
| |
| return sd_bus_send(bus, m, NULL); |
| } |
| |
| int sd_bus_reply_method_error( |
| sd_bus *bus, |
| sd_bus_message *call, |
| const sd_bus_error *e) { |
| |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| int r; |
| |
| if (!bus) |
| return -EINVAL; |
| if (!call) |
| return -EINVAL; |
| if (!call->sealed) |
| return -EPERM; |
| if (call->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
| return -EINVAL; |
| if (!sd_bus_error_is_set(e)) |
| return -EINVAL; |
| if (!BUS_IS_OPEN(bus->state)) |
| return -ENOTCONN; |
| if (bus_pid_changed(bus)) |
| return -ECHILD; |
| |
| if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
| return 0; |
| |
| r = sd_bus_message_new_method_error(bus, call, e, &m); |
| if (r < 0) |
| return r; |
| |
| return sd_bus_send(bus, m, NULL); |
| } |
| |
| 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(); |
| } |