diff options
Diffstat (limited to 'src/libsystemd/sd-bus/sd-bus.c')
| -rw-r--r-- | src/libsystemd/sd-bus/sd-bus.c | 3032 |
1 files changed, 3032 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c new file mode 100644 index 0000000000..95d80db240 --- /dev/null +++ b/src/libsystemd/sd-bus/sd-bus.c @@ -0,0 +1,3032 @@ +/*-*- 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 "def.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" +#include "bus-introspect.h" +#include "bus-signature.h" +#include "bus-objects.h" +#include "bus-util.h" +#include "bus-container.h" +#include "bus-protocol.h" + +static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec); +static int attach_io_events(sd_bus *b); +static void detach_io_events(sd_bus *b); + +static void bus_close_fds(sd_bus *b) { + assert(b); + + detach_io_events(b); + + if (b->input_fd >= 0) + close_nointr_nofail(b->input_fd); + + 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_node_destroy(sd_bus *b, struct node *n) { + struct node_callback *c; + struct node_vtable *v; + struct node_enumerator *e; + + assert(b); + + if (!n) + return; + + while (n->child) + bus_node_destroy(b, n->child); + + while ((c = n->callbacks)) { + LIST_REMOVE(callbacks, n->callbacks, c); + free(c); + } + + while ((v = n->vtables)) { + LIST_REMOVE(vtables, n->vtables, v); + free(v->interface); + free(v); + } + + while ((e = n->enumerators)) { + LIST_REMOVE(enumerators, n->enumerators, e); + free(e); + } + + if (n->parent) + LIST_REMOVE(siblings, n->parent->child, n); + + assert_se(hashmap_remove(b->nodes, n->path) == n); + free(n->path); + free(n); +} + +static void bus_reset_queues(sd_bus *b) { + unsigned i; + + assert(b); + + for (i = 0; i < b->rqueue_size; i++) + sd_bus_message_unref(b->rqueue[i]); + free(b->rqueue); + + for (i = 0; i < b->wqueue_size; i++) + sd_bus_message_unref(b->wqueue[i]); + free(b->wqueue); + + b->rqueue = b->wqueue = NULL; + b->rqueue_allocated = b->wqueue_allocated = 0; + b->rqueue_size = b->wqueue_size = 0; +} + +static void bus_free(sd_bus *b) { + struct filter_callback *f; + struct node *n; + + assert(b); + + sd_bus_detach_event(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->machine); + free(b->fake_label); + free(b->cgroup_root); + + free(b->exec_path); + strv_free(b->exec_argv); + + close_many(b->fds, b->n_fds); + free(b->fds); + + bus_reset_queues(b); + + hashmap_free_free(b->reply_callbacks); + prioq_free(b->reply_callbacks_prioq); + + while ((f = b->filter_callbacks)) { + LIST_REMOVE(callbacks, b->filter_callbacks, f); + free(f); + } + + bus_match_free(&b->match_callbacks); + + hashmap_free_free(b->vtable_methods); + hashmap_free_free(b->vtable_properties); + + while ((n = hashmap_first(b->nodes))) + bus_node_destroy(b, n); + + 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, -EINVAL); + assert_return(output_fd >= 0, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + bus->input_fd = input_fd; + bus->output_fd = output_fd; + return 0; +} + +_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_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_attach_timestamp(sd_bus *bus, int b) { + assert_return(bus, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); + + SET_FLAG(bus->attach_flags, KDBUS_ATTACH_TIMESTAMP, b); + return 0; +} + +_public_ int sd_bus_negotiate_attach_creds(sd_bus *bus, uint64_t mask) { + assert_return(bus, -EINVAL); + assert_return(mask <= _SD_BUS_CREDS_ALL, -EINVAL); + assert_return(bus->state == BUS_UNSET, -EPERM); + assert_return(!bus_pid_changed(bus), -ECHILD); + + /* The well knowns we need unconditionally, so that matches can work */ + bus->creds_mask = mask | SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_UNIQUE_NAME; + + return kdbus_translate_attach_flags(bus->creds_mask, &bus->creds_mask); +} + +_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; +} + +static int hello_callback(sd_bus *bus, sd_bus_message *reply, void *userdata, sd_bus_error *error) { + const char *s; + int r; + + assert(bus); + assert(bus->state == BUS_HELLO || bus->state == BUS_CLOSING); + assert(reply); + + r = sd_bus_message_get_errno(reply); + if (r < 0) + return r; + if (r > 0) + return -r; + + r = sd_bus_message_read(reply, "s", &s); + if (r < 0) + 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_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", + "org.freedesktop.DBus", + "Hello", + &m); + if (r < 0) + return r; + + return sd_bus_call_async(bus, m, hello_callback, NULL, 0, &bus->hello_cookie); +} + +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; + int r; + + assert(b); + assert(p); + assert(*p); + assert(guid); + + while (**p != 0 && **p != ';') { + r = parse_address_key(p, "guid", guid); + if (r < 0) + return r; + else if (r > 0) + continue; + + r = parse_address_key(p, "machine", &machine); + if (r < 0) + return r; + else if (r > 0) + continue; + + skip_address_key(p); + } + + if (!machine) + return -EINVAL; + + if (!filename_is_safe(machine)) + return -EINVAL; + + free(b->machine); + b->machine = machine; + machine = NULL; + + b->sockaddr.un.sun_family = AF_UNIX; + strncpy(b->sockaddr.un.sun_path, "/var/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path)); + b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/var/run/dbus/system_bus_socket") - 1; + + return 0; +} + +static int parse_container_kernel_address(sd_bus *b, const char **p, char **guid) { + _cleanup_free_ char *machine = NULL; + int r; + + assert(b); + assert(p); + assert(*p); + assert(guid); + + while (**p != 0 && **p != ';') { + r = parse_address_key(p, "guid", guid); + if (r < 0) + return r; + else if (r > 0) + continue; + + r = parse_address_key(p, "machine", &machine); + if (r < 0) + return r; + else if (r > 0) + continue; + + skip_address_key(p); + } + + if (!machine) + return -EINVAL; + + if (!filename_is_safe(machine)) + return -EINVAL; + + free(b->machine); + b->machine = machine; + machine = NULL; + + free(b->kernel); + b->kernel = strdup("/dev/kdbus/0-system/bus"); + if (!b->kernel) + return -ENOMEM; + + return 0; +} + +static void bus_reset_parsed_address(sd_bus *b) { + assert(b); + + 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; + free(b->machine); + b->machine = 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; + } else if (startswith(a, "x-container-unix:")) { + + a += 17; + r = parse_container_unix_address(b, &a, &guid); + if (r < 0) + return r; + + break; + } else if (startswith(a, "x-container-kernel:")) { + + a += 19; + r = parse_container_kernel_address(b, &a, &guid); + if (r < 0) + return r; + + break; + } + + 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 (;;) { + bool skipped = false; + + bus_close_fds(b); + + if (b->exec_path) + r = bus_socket_exec(b); + else if (b->machine && b->kernel) + r = bus_container_connect_kernel(b); + else if (b->machine && b->sockaddr.sa.sa_family != AF_UNSPEC) + r = bus_container_connect_socket(b); + else if (b->kernel) + r = bus_kernel_connect(b); + else if (b->sockaddr.sa.sa_family != AF_UNSPEC) + r = bus_socket_connect(b); + else + skipped = true; + + if (!skipped) { + if (r >= 0) { + r = attach_io_events(b); + if (r >= 0) + return r; + } + + b->last_connect_error = -r; + } + + 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) + return r; + + return bus_send_hello(bus); +} + +_public_ int sd_bus_open_system(sd_bus **ret) { + const char *e; + sd_bus *b; + int r; + + assert_return(ret, -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); + else + r = sd_bus_set_address(b, DEFAULT_SYSTEM_BUS_PATH); + if (r < 0) + goto fail; + + b->bus_client = true; + + /* Let's do per-method access control on the system bus. We + * need the caller's UID and capability set for that. */ + b->trusted = false; + b->attach_flags |= KDBUS_ATTACH_CAPS | KDBUS_ATTACH_CREDS; + + r = sd_bus_start(b); + if (r < 0) + goto fail; + + *ret = b; + return 0; + +fail: + bus_free(b); + return r; +} + +_public_ int sd_bus_open_user(sd_bus **ret) { + const char *e; + sd_bus *b; + int r; + + assert_return(ret, -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) { + _cleanup_free_ char *ee = NULL; + + ee = bus_address_escape(e); + if (!ee) { + r = -ENOMEM; + goto fail; + } + +#ifdef ENABLE_KDBUS + asprintf(&b->address, KERNEL_USER_BUS_FMT ";" UNIX_USER_BUS_FMT, (unsigned long) getuid(), ee); +#else + asprintf(&b->address, UNIX_USER_BUS_FMT, ee); +#endif + } else { +#ifdef ENABLE_KDBUS + asprintf(&b->address, KERNEL_USER_BUS_FMT, (unsigned long) getuid()); +#else + return -ECONNREFUSED; +#endif + } + + if (!b->address) { + r = -ENOMEM; + goto fail; + } + } + + b->bus_client = true; + + /* We don't do any per-method access control on the user + * bus. */ + b->trusted = true; + + r = sd_bus_start(b); + if (r < 0) + goto fail; + + *ret = b; + return 0; + +fail: + bus_free(b); + return r; +} + +_public_ int sd_bus_open_system_remote(const char *host, sd_bus **ret) { + _cleanup_free_ char *e = NULL; + char *p = NULL; + sd_bus *bus; + int r; + + assert_return(host, -EINVAL); + assert_return(ret, -EINVAL); + + e = bus_address_escape(host); + if (!e) + return -ENOMEM; + + p = strjoin("unixexec:path=ssh,argv1=-xT,argv2=", e, ",argv3=systemd-stdio-bridge", NULL); + if (!p) + return -ENOMEM; + + r = sd_bus_new(&bus); + if (r < 0) { + free(p); + return r; + } + + bus->address = p; + bus->bus_client = true; + + r = sd_bus_start(bus); + if (r < 0) { + bus_free(bus); + return r; + } + + *ret = bus; + return 0; +} + +_public_ int sd_bus_open_system_container(const char *machine, sd_bus **ret) { + _cleanup_free_ char *e = NULL; + sd_bus *bus; + char *p; + int r; + + assert_return(machine, -EINVAL); + assert_return(ret, -EINVAL); + assert_return(filename_is_safe(machine), -EINVAL); + + e = bus_address_escape(machine); + if (!e) + return -ENOMEM; + +#ifdef ENABLE_KDBUS + p = strjoin("x-container-kernel:machine=", e, ";x-container-unix:machine=", e, NULL); +#else + p = strjoin("x-container-unix:machine=", e, NULL); +#endif + if (!p) + return -ENOMEM; + + r = sd_bus_new(&bus); + if (r < 0) { + free(p); + return r; + } + + bus->address = p; + bus->bus_client = true; + + r = sd_bus_start(bus); + if (r < 0) { + bus_free(bus); + return r; + } + + *ret = bus; + return 0; +} + +_public_ void sd_bus_close(sd_bus *bus) { + + if (!bus) + return; + if (bus->state == BUS_CLOSED) + 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. */ +} + +static void bus_enter_closing(sd_bus *bus) { + assert(bus); + + if (bus->state != BUS_OPENING && + bus->state != BUS_AUTHENTICATING && + bus->state != BUS_HELLO && + bus->state != BUS_RUNNING) + return; + + bus->state = BUS_CLOSING; +} + +_public_ sd_bus *sd_bus_ref(sd_bus *bus) { + assert_return(bus, NULL); + + assert_se(REFCNT_INC(bus->n_ref) >= 2); + + return bus; +} + +_public_ sd_bus *sd_bus_unref(sd_bus *bus) { + unsigned i; + + if (!bus) + return NULL; + + i = REFCNT_DEC(bus->n_ref); + if (i != bus->rqueue_size + bus->wqueue_size) + return NULL; + + for (i = 0; i < bus->rqueue_size; i++) + if (bus->rqueue[i]->n_ref > 1) + return NULL; + + for (i = 0; i < bus->wqueue_size; i++) + if (bus->wqueue[i]->n_ref > 1) + return NULL; + + /* we are the only holders on the messages */ + 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 (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_server_id(sd_bus *bus, sd_id128_t *server_id) { + int r; + + assert_return(bus, -EINVAL); + assert_return(server_id, -EINVAL); + assert_return(!bus_pid_changed(bus), -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, 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) { + assert(b); + + /* Do packet version and endianess already match? */ + if ((b->message_version == 0 || b->message_version == (*m)->header->version) && + (b->message_endian == 0 || b->message_endian == (*m)->header->endian)) + return 0; + + /* No? Then remarshal! */ + return bus_message_remarshal(b, m); +} + +int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m) { + assert(b); + assert(m); + + /* The bus specification says the serial number cannot be 0, + * hence let's fill something in for synthetic messages. Since + * synthetic messages might have a fake sender and we don't + * want to interfere with the real sender's serial numbers we + * pick a fixed, artifical one. We use (uint32_t) -1 rather + * than (uint64_t) -1 since dbus1 only had 32bit identifiers, + * even though kdbus can do 64bit. */ + + return bus_message_seal(m, 0xFFFFFFFFULL, 0); +} + +static int bus_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { + int r; + + assert(bus); + assert(m); + + if (bus->is_kernel) + r = bus_kernel_write_message(bus, m); + 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=%lu reply_cookie=%lu error=%s", + bus_message_type_to_string(m->header->type), + strna(sd_bus_message_get_sender(m)), + strna(sd_bus_message_get_destination(m)), + strna(sd_bus_message_get_path(m)), + strna(sd_bus_message_get_interface(m)), + strna(sd_bus_message_get_member(m)), + (unsigned long) BUS_MESSAGE_COOKIE(m), + (unsigned long) m->reply_cookie, + strna(m->error.message)); + + return r; +} + +static int dispatch_wqueue(sd_bus *bus) { + int r, ret = 0; + + assert(bus); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + while (bus->wqueue_size > 0) { + + r = bus_write_message(bus, bus->wqueue[0], &bus->windex); + if (r < 0) + return r; + else if (r == 0) + /* Didn't do anything this time */ + return ret; + else if (bus->is_kernel || bus->windex >= BUS_MESSAGE_SIZE(bus->wqueue[0])) { + /* Fully written. Let's drop the entry from + * 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) { + assert(bus); + + if (bus->is_kernel) + return bus_kernel_read_message(bus); + else + return bus_socket_read_message(bus); +} + +int bus_rqueue_make_room(sd_bus *bus) { + assert(bus); + + if (bus->rqueue_size >= BUS_RQUEUE_MAX) + return -ENOBUFS; + + if (!GREEDY_REALLOC(bus->rqueue, bus->rqueue_allocated, bus->rqueue_size + 1)) + return -ENOMEM; + + return 0; +} + +static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) { + int r, ret = 0; + + assert(bus); + assert(m); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + 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); + if (r < 0) + return r; + if (r == 0) + return ret; + + ret = 1; + } +} + +_public_ int sd_bus_send(sd_bus *bus, sd_bus_message *_m, uint64_t *cookie) { + _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m); + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + if (m->n_fds > 0) { + r = sd_bus_can_send(bus, SD_BUS_TYPE_UNIX_FD); + if (r < 0) + return r; + if (r == 0) + return -ENOTSUP; + } + + /* 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 && !cookie) + return 1; + + if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) { + size_t idx = 0; + + r = bus_write_message(bus, m, &idx); + if (r < 0) { + if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + return -ECONNRESET; + } + + 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 { + /* 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); + } + + if (cookie) + *cookie = BUS_MESSAGE_COOKIE(m); + + return 1; +} + +_public_ int sd_bus_send_to(sd_bus *bus, sd_bus_message *m, const char *destination, uint64_t *cookie) { + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + if (!streq_ptr(m->destination, destination)) { + + if (!destination) + return -EEXIST; + + r = sd_bus_message_set_destination(m, destination); + if (r < 0) + return r; + } + + return sd_bus_send(bus, m, cookie); +} + +static usec_t calc_elapse(uint64_t usec) { + if (usec == (uint64_t) -1) + return 0; + + 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_message *_m, + sd_bus_message_handler_t callback, + void *userdata, + uint64_t usec, + uint64_t *cookie) { + + _cleanup_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m); + struct reply_callback *c; + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); + assert_return(callback, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func); + if (r < 0) + 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; + + c = new0(struct reply_callback, 1); + if (!c) + return -ENOMEM; + + c->callback = callback; + c->userdata = userdata; + c->cookie = BUS_MESSAGE_COOKIE(m); + c->timeout = calc_elapse(m->timeout); + + r = hashmap_put(bus->reply_callbacks, &c->cookie, 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_call_async_cancel(bus, c->cookie); + return r; + } + } + + r = sd_bus_send(bus, m, cookie); + if (r < 0) { + sd_bus_call_async_cancel(bus, c->cookie); + return r; + } + + return r; +} + +_public_ int sd_bus_call_async_cancel(sd_bus *bus, uint64_t cookie) { + struct reply_callback *c; + + assert_return(bus, -EINVAL); + assert_return(cookie != 0, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + c = hashmap_remove(bus->reply_callbacks, &cookie); + 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 || 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_bus_message_unref_ sd_bus_message *m = sd_bus_message_ref(_m); + usec_t timeout; + uint64_t cookie; + unsigned i; + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(m, -EINVAL); + assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL); + assert_return(!bus_error_is_dirty(error), -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = bus_ensure_running(bus); + if (r < 0) + return r; + + i = bus->rqueue_size; + + r = bus_seal_message(bus, m, usec); + if (r < 0) + return r; + + r = bus_remarshal_message(bus, &m); + if (r < 0) + return r; + + r = sd_bus_send(bus, m, &cookie); + if (r < 0) + return r; + + 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--; + + if (incoming->header->type == SD_BUS_MESSAGE_METHOD_RETURN) { + + if (reply) + *reply = incoming; + else + sd_bus_message_unref(incoming); + + return 1; + } else if (incoming->header->type == SD_BUS_MESSAGE_METHOD_ERROR) + r = sd_bus_error_copy(error, &incoming->error); + else + r = -EIO; + + sd_bus_message_unref(incoming); + return r; + + } else if (BUS_MESSAGE_COOKIE(incoming) == cookie && + bus->unique_name && + incoming->sender && + streq(bus->unique_name, incoming->sender)) { + + memmove(bus->rqueue + i, bus->rqueue + i + 1, sizeof(sd_bus_message*) * (bus->rqueue_size - i - 1)); + bus->rqueue_size--; + + /* Our own message? Somebody is trying + * to send its own client a message, + * let's not dead-lock, let's fail + * immediately. */ + + sd_bus_message_unref(incoming); + return -ELOOP; + } + + /* Try to read more, right-away */ + i++; + } + + r = bus_read_message(bus); + if (r < 0) { + if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + return -ECONNRESET; + } + + return r; + } + 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; + if (r == 0) + return -ETIMEDOUT; + + r = dispatch_wqueue(bus); + if (r < 0) { + if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + return -ECONNRESET; + } + + return 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_IS_OPEN(bus->state) || bus->state == BUS_CLOSING, -ENOTCONN); + assert_return(!bus_pid_changed(bus), -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; +} + +_public_ int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { + struct reply_callback *c; + + assert_return(bus, -EINVAL); + assert_return(timeout_usec, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state) || bus->state == BUS_CLOSING, -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + if (bus->state == BUS_CLOSING) { + *timeout_usec = 0; + return 1; + } + + if (bus->state == BUS_AUTHENTICATING) { + *timeout_usec = bus->auth_timeout; + return 1; + } + + 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; + } + + *timeout_usec = c->timeout; + return 1; +} + +static int process_timeout(sd_bus *bus) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; + _cleanup_bus_message_unref_ sd_bus_message* m = NULL; + struct reply_callback *c; + usec_t n; + 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; + + m->sender = "org.freedesktop.DBus"; + + r = bus_seal_synthetic_message(bus, m); + if (r < 0) + return r; + + assert_se(prioq_pop(bus->reply_callbacks_prioq) == c); + hashmap_remove(bus->reply_callbacks, &c->cookie); + + bus->current = m; + bus->iteration_counter ++; + + r = c->callback(bus, m, c->userdata, &error_buffer); + r = bus_maybe_reply_error(m, r, &error_buffer); + free(c); + + bus->current = NULL; + + return r; +} + +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 != bus->hello_cookie) + return -EIO; + + return 0; +} + +static int process_reply(sd_bus *bus, sd_bus_message *m) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; + struct reply_callback *c; + int r; + + assert(bus); + assert(m); + + if (m->header->type != SD_BUS_MESSAGE_METHOD_RETURN && + m->header->type != SD_BUS_MESSAGE_METHOD_ERROR) + return 0; + + c = hashmap_remove(bus->reply_callbacks, &m->reply_cookie); + 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, &error_buffer); + r = bus_maybe_reply_error(m, r, &error_buffer); + free(c); + + return r; +} + +static int process_filter(sd_bus *bus, sd_bus_message *m) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; + struct filter_callback *l; + int r; + + 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, &error_buffer); + 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_bus_message_unref_ sd_bus_message *reply = NULL; + int r; + + assert(bus); + assert(m); + + if (bus->manual_peer_interface) + return 0; + + if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL) + return 0; + + if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer")) + return 0; + + if (m->header->flags & 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_message(sd_bus *bus, sd_bus_message *m) { + int r; + + assert(bus); + assert(m); + + bus->current = m; + bus->iteration_counter++; + + log_debug("Got message type=%s sender=%s destination=%s object=%s interface=%s member=%s cookie=%lu reply_cookie=%lu error=%s", + bus_message_type_to_string(m->header->type), + strna(sd_bus_message_get_sender(m)), + strna(sd_bus_message_get_destination(m)), + strna(sd_bus_message_get_path(m)), + strna(sd_bus_message_get_interface(m)), + strna(sd_bus_message_get_member(m)), + (unsigned long) BUS_MESSAGE_COOKIE(m), + (unsigned long) m->reply_cookie, + strna(m->error.message)); + + r = process_hello(bus, m); + if (r != 0) + goto finish; + + r = process_reply(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 = NULL; + return r; +} + +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_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 process_closing(sd_bus *bus, sd_bus_message **ret) { + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + struct reply_callback *c; + int r; + + assert(bus); + assert(bus->state == BUS_CLOSING); + + c = hashmap_first(bus->reply_callbacks); + if (c) { + _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; + + /* First, fail all outstanding method calls */ + r = bus_message_new_synthetic_error( + bus, + c->cookie, + &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Connection terminated"), + &m); + if (r < 0) + return r; + + r = bus_seal_synthetic_message(bus, m); + if (r < 0) + return r; + + if (c->timeout != 0) + prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); + + hashmap_remove(bus->reply_callbacks, &c->cookie); + + bus->current = m; + bus->iteration_counter++; + + r = c->callback(bus, m, c->userdata, &error_buffer); + r = bus_maybe_reply_error(m, r, &error_buffer); + free(c); + + goto finish; + } + + /* Then, synthesize a Disconnected message */ + r = sd_bus_message_new_signal( + bus, + "/org/freedesktop/DBus/Local", + "org.freedesktop.DBus.Local", + "Disconnected", + &m); + if (r < 0) + return r; + + m->sender = "org.freedesktop.DBus.Local"; + + r = bus_seal_synthetic_message(bus, m); + if (r < 0) + return r; + + sd_bus_close(bus); + + bus->current = m; + bus->iteration_counter++; + + r = process_filter(bus, m); + if (r != 0) + goto finish; + + r = process_match(bus, m); + if (r != 0) + goto finish; + + if (ret) { + *ret = m; + m = NULL; + } + + r = 1; + +finish: + bus->current = NULL; + return r; +} + +_public_ int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { + BUS_DONT_DESTROY(bus); + int r; + + /* 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, -EBUSY); + + switch (bus->state) { + + case BUS_UNSET: + return -ENOTCONN; + + case BUS_CLOSED: + return -ECONNRESET; + + case BUS_OPENING: + r = bus_socket_process_opening(bus); + if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + r = 1; + } else if (r < 0) + return r; + if (ret) + *ret = NULL; + return r; + + case BUS_AUTHENTICATING: + r = bus_socket_process_authenticating(bus); + if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + r = 1; + } else if (r < 0) + return r; + + if (ret) + *ret = NULL; + + return r; + + case BUS_RUNNING: + case BUS_HELLO: + r = process_running(bus, ret); + if (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -ESHUTDOWN) { + bus_enter_closing(bus); + r = 1; + + if (ret) + *ret = NULL; + } + + return r; + + case BUS_CLOSING: + return process_closing(bus, ret); + } + + assert_not_reached("Unknown state"); +} + +static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { + struct pollfd p[2] = {}; + int r, e, n; + struct timespec ts; + usec_t m = (usec_t) -1; + + assert(bus); + + if (bus->state == BUS_CLOSING) + return 1; + + assert_return(BUS_IS_OPEN(bus->state), -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; + + assert_return(BUS_IS_OPEN(bus->state) , -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; + + assert_return(BUS_IS_OPEN(bus->state), -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 (r == -ENOTCONN || r == -ECONNRESET || r == -EPIPE || r == -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_message_handler_t callback, + void *userdata) { + + struct filter_callback *f; + + assert_return(bus, -EINVAL); + assert_return(callback, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + f = new0(struct filter_callback, 1); + if (!f) + return -ENOMEM; + f->callback = callback; + f->userdata = userdata; + + bus->filter_callbacks_modified = true; + LIST_PREPEND(callbacks, bus->filter_callbacks, f); + return 0; +} + +_public_ int sd_bus_remove_filter(sd_bus *bus, + sd_bus_message_handler_t callback, + void *userdata) { + + struct filter_callback *f; + + assert_return(bus, -EINVAL); + assert_return(callback, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + LIST_FOREACH(callbacks, f, bus->filter_callbacks) { + if (f->callback == callback && f->userdata == userdata) { + bus->filter_callbacks_modified = true; + LIST_REMOVE(callbacks, bus->filter_callbacks, f); + free(f); + return 1; + } + } + + return 0; +} + +_public_ int sd_bus_add_match(sd_bus *bus, + const char *match, + sd_bus_message_handler_t callback, + void *userdata) { + + struct bus_match_component *components = NULL; + unsigned n_components = 0; + uint64_t cookie = 0; + 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; + + 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; +} + +_public_ int sd_bus_remove_match(sd_bus *bus, + const char *match, + sd_bus_message_handler_t callback, + void *userdata) { + + struct bus_match_component *components = NULL; + unsigned n_components = 0; + int r = 0, q = 0; + uint64_t cookie = 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) + 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; +} + +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); + + 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_fd, 0, io_callback, bus, &bus->input_io_event_source); + if (r < 0) + return r; + + r = sd_event_source_set_prepare(bus->input_io_event_source, prepare_callback); + if (r < 0) + return r; + + r = sd_event_source_set_priority(bus->input_io_event_source, bus->event_priority); + } else + r = sd_event_source_set_io_fd(bus->input_io_event_source, bus->input_fd); + + 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_fd, 0, io_callback, bus, &bus->output_io_event_source); + if (r < 0) + return r; + + r = sd_event_source_set_priority(bus->output_io_event_source, bus->event_priority); + } else + r = sd_event_source_set_io_fd(bus->output_io_event_source, bus->output_fd); + + if (r < 0) + 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_monotonic(bus->event, 0, 0, time_callback, bus, &bus->time_event_source); + if (r < 0) + goto fail; + + r = sd_event_source_set_priority(bus->time_event_source, priority); + if (r < 0) + goto fail; + + r = sd_event_add_exit(bus->event, quit_callback, bus, &bus->quit_event_source); + if (r < 0) + goto fail; + + r = attach_io_events(bus); + if (r < 0) + goto fail; + + 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); + } + + if (bus->event) + bus->event = sd_event_unref(bus->event); + + return 1; +} + +_public_ sd_event* sd_bus_get_event(sd_bus *bus) { + assert_return(bus, NULL); + + return bus->event; +} + +_public_ sd_bus_message* sd_bus_get_current(sd_bus *bus) { + assert_return(bus, NULL); + + return bus->current; +} + +static int bus_default(int (*bus_open)(sd_bus **), sd_bus **default_bus, sd_bus **ret) { + sd_bus *b = NULL; + int r; + + assert(bus_open); + assert(default_bus); + + if (!ret) + return !!*default_bus; + + if (*default_bus) { + *ret = sd_bus_ref(*default_bus); + return 0; + } + + r = bus_open(&b); + if (r < 0) + return r; + + b->default_bus_ptr = default_bus; + b->tid = gettid(); + *default_bus = b; + + *ret = b; + return 1; +} + +_public_ int sd_bus_default_system(sd_bus **ret) { + static thread_local sd_bus *default_system_bus = NULL; + + return bus_default(sd_bus_open_system, &default_system_bus, ret); +} + +_public_ int sd_bus_default_user(sd_bus **ret) { + static thread_local sd_bus *default_user_bus = NULL; + + return bus_default(sd_bus_open_user, &default_user_bus, ret); +} + +_public_ int sd_bus_get_tid(sd_bus *b, pid_t *tid) { + assert_return(b, -EINVAL); + assert_return(tid, -EINVAL); + assert_return(!bus_pid_changed(b), -ECHILD); + + if (b->tid != 0) { + *tid = b->tid; + return 0; + } + + if (b->event) + return sd_event_get_tid(b->event, tid); + + return -ENXIO; +} + +_public_ char *sd_bus_label_escape(const char *s) { + char *r, *t; + const char *f; + + assert_return(s, NULL); + + /* Escapes all chars that D-Bus' object path cannot deal + * with. Can be reversed with bus_path_unescape(). We special + * case the empty string. */ + + if (*s == 0) + return strdup("_"); + + r = new(char, strlen(s)*3 + 1); + if (!r) + return NULL; + + for (f = s, t = r; *f; f++) { + + /* Escape everything that is not a-zA-Z0-9. We also + * escape 0-9 if it's the first character */ + + if (!(*f >= 'A' && *f <= 'Z') && + !(*f >= 'a' && *f <= 'z') && + !(f > s && *f >= '0' && *f <= '9')) { + *(t++) = '_'; + *(t++) = hexchar(*f >> 4); + *(t++) = hexchar(*f); + } else + *(t++) = *f; + } + + *t = 0; + + return r; +} + +_public_ char *sd_bus_label_unescape(const char *f) { + char *r, *t; + + assert_return(f, NULL); + + /* Special case for the empty string */ + if (streq(f, "_")) + return strdup(""); + + r = new(char, strlen(f) + 1); + if (!r) + return NULL; + + for (t = r; *f; f++) { + + if (*f == '_') { + int a, b; + + if ((a = unhexchar(f[1])) < 0 || + (b = unhexchar(f[2])) < 0) { + /* Invalid escape code, let's take it literal then */ + *(t++) = '_'; + } else { + *(t++) = (char) ((a << 4) | b); + f += 2; + } + } else + *(t++) = *f; + } + + *t = 0; + + return r; +} + +_public_ int sd_bus_get_peer_creds(sd_bus *bus, uint64_t mask, sd_bus_creds **ret) { + sd_bus_creds *c; + pid_t pid = 0; + int r; + + assert_return(bus, -EINVAL); + assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP); + assert_return(ret, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(!bus->is_kernel, -ENOTSUP); + + if (!bus->ucred_valid && !isempty(bus->label)) + return -ENODATA; + + c = bus_creds_new(); + if (!c) + return -ENOMEM; + + if (bus->ucred_valid) { + pid = c->pid = bus->ucred.pid; + c->uid = bus->ucred.uid; + c->gid = bus->ucred.gid; + + c->mask |= (SD_BUS_CREDS_UID | SD_BUS_CREDS_PID | SD_BUS_CREDS_GID) & mask; + } + + if (!isempty(bus->label) && (mask & SD_BUS_CREDS_SELINUX_CONTEXT)) { + c->label = strdup(bus->label); + if (!c->label) { + sd_bus_creds_unref(c); + return -ENOMEM; + } + + c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT; + } + + r = bus_creds_add_more(c, mask, pid, 0); + if (r < 0) + return r; + + *ret = c; + return 0; +} + +_public_ int sd_bus_try_close(sd_bus *bus) { + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(bus->is_kernel, -ENOTSUP); + + if (bus->rqueue_size > 0) + return -EBUSY; + + if (bus->wqueue_size > 0) + return -EBUSY; + + r = bus_kernel_try_close(bus); + if (r < 0) + return r; + + sd_bus_close(bus); + return 0; +} |