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Diffstat (limited to 'src/bus-driverd/bus-driverd.c')
| -rw-r--r-- | src/bus-driverd/bus-driverd.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/src/bus-driverd/bus-driverd.c b/src/bus-driverd/bus-driverd.c new file mode 100644 index 0000000000..e3d32ec548 --- /dev/null +++ b/src/bus-driverd/bus-driverd.c @@ -0,0 +1,544 @@ +/*** + This file is part of systemd. + + Copyright 2013 Daniel Mack + + 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 <stdlib.h> +#include <stdbool.h> +#include <unistd.h> +#include <getopt.h> +#include <locale.h> +#include <string.h> +#include <poll.h> +#include <netdb.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/timex.h> +#include <sys/utsname.h> +#include <unistd.h> + +#include "kdbus.h" +#include "sd-bus.h" +#include "bus-internal.h" + +#include "sd-daemon.h" +#include "sd-event.h" +#include "event-util.h" +#include "bus-util.h" +#include "bus-error.h" +#include "bus-message.h" +#include "bus-kernel.h" +#include "socket-util.h" +#include "util.h" +#include "build.h" +#include "strv.h" +#include "sd-id128.h" +#include "async.h" +#include "hashmap.h" + +#define DBUS_PATH "/org/freedesktop/DBus" +#define DBUS_INTERFACE "org.freedesktop.DBus" + +/* + * TODO: + * + * AddMatch / RemoveMatch + * ListActivatableNames + * StartServiceByName + */ + +static sd_bus *driver_bus; + +static int help(void) { + + printf("%s [OPTIONS...] <bus-path>\n\n" + "Driver to provide a org.freedesktop.DBus interface on the given kdbus node.\n\n" + " -h --help Show this help\n" + " --version Show package version\n", + program_invocation_short_name); + + return 0; +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_VERSION = 0x100, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { NULL, 0, NULL, 0 } + }; + + int c; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { + + switch (c) { + + case 'h': + help(); + return 0; + + case ARG_VERSION: + puts(PACKAGE_STRING); + puts(SYSTEMD_FEATURES); + return 0; + + case '?': + return -EINVAL; + + default: + log_error("Unknown option code %c", c); + return -EINVAL; + } + } + + return 1; +} + +static int driver_name_info_error(sd_bus *bus, sd_bus_message *m, const char *name, int error_code) { + + if (error_code == -ENXIO || error_code == -ENOENT) + return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_NAME_HAS_NO_OWNER, + "Could not get owner of name '%s': no such name", + name); + + return sd_bus_reply_method_errno(m, error_code, NULL); +} + +static int driver_add_match(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + char *arg0, *match; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + match = strdup(arg0); + if (!match) + return -ENOMEM; + + /* FIXME */ + + return sd_bus_reply_method_return(m, NULL); +} + +static int driver_remove_match(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + char *arg0; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + /* FIXME */ + + return sd_bus_reply_method_return(m, NULL); +} + +static int driver_get_security_ctx(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + char *arg0; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_SELINUX_CONTEXT, &creds); + if (r < 0) { + if (r == -ENOENT) + return driver_name_info_error(bus, m, arg0, r); + else + return r; + } + + r = sd_bus_message_new_method_return(m, &reply); + if (r < 0) + return r; + + r = sd_bus_message_append_array(reply, 'y', creds->label, strlen(creds->label)); + if (r < 0) + return r; + + return sd_bus_send(bus, reply, NULL); +} + +static int driver_get_pid(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; + char *arg0; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_PID, &creds); + if (r < 0) + return r; + + return sd_bus_reply_method_return(m, "u", creds->pid); +} + +static int driver_get_user(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; + char *arg0; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + r = sd_bus_get_owner(bus, arg0, SD_BUS_CREDS_UID, &creds); + if (r < 0) { + if (r == -ENOENT) + return driver_name_info_error(bus, m, arg0, r); + else + return r; + } + + return sd_bus_reply_method_return(m, "u", creds->uid); +} + +static int driver_get_id(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + sd_id128_t server_id; + char buf[SD_ID128_STRING_MAX]; + int r; + + r = sd_bus_get_server_id(bus, &server_id); + if (r < 0) + return r; + + return sd_bus_reply_method_return(m, "s", sd_id128_to_string(server_id, buf)); +} + +static int driver_get_name_owner(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; + _cleanup_free_ char *owner = NULL; + char *arg0; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + r = sd_bus_get_owner(bus, arg0, 0, &creds); + if (r < 0) { + if (r == -ENOENT) + return driver_name_info_error(bus, m, arg0, r); + else + return r; + } + + return sd_bus_reply_method_return(m, "s", creds->unique_name); +} + +static int driver_hello(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + return sd_bus_reply_method_return(m, "s", m->sender); +} + +static int driver_list_names(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + _cleanup_strv_free_ char **names = NULL; + int r; + + r = sd_bus_list_names(bus, &names, NULL); + if (r < 0) + return r; + + r = sd_bus_message_new_method_return(m, &reply); + if (r < 0) + return r; + + r = sd_bus_message_append_strv(reply, names); + if (r < 0) + return r; + + return sd_bus_send(bus, reply, NULL); +} + +static int driver_list_activatable_names(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + _cleanup_strv_free_ char **names = NULL; + int r; + + r = sd_bus_list_names(bus, NULL, &names); + if (r < 0) + return r; + + r = sd_bus_message_new_method_return(m, &reply); + if (r < 0) + return r; + + r = sd_bus_message_append_strv(reply, names); + if (r < 0) + return r; + + return sd_bus_send(bus, reply, NULL); +} + +static int driver_list_queued_owners(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + struct kdbus_cmd_name_list cmd = {}; + struct kdbus_name_list *name_list; + struct kdbus_cmd_name *name; + _cleanup_strv_free_ char **owners = NULL; + char *arg0; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + cmd.flags = KDBUS_NAME_LIST_QUEUED; + + r = ioctl(bus->input_fd, KDBUS_CMD_NAME_LIST, &cmd); + if (r < 0) + return -errno; + + name_list = (struct kdbus_name_list *) ((uint8_t *) bus->kdbus_buffer + cmd.offset); + + KDBUS_ITEM_FOREACH(name, name_list, names) { + if (name->size > sizeof(*name) && !streq(name->name, arg0)) { + char *n; + + if (asprintf(&n, ":1.%llu", (unsigned long long) name->id) < 0) + return -ENOMEM; + + r = strv_push(&owners, n); + if (r < 0) { + free(n); + return -ENOMEM; + } + } + } + + r = ioctl(sd_bus_get_fd(bus), KDBUS_CMD_FREE, &cmd.offset); + if (r < 0) + return -errno; + + r = sd_bus_message_new_method_return(m, &reply); + if (r < 0) + return r; + + r = sd_bus_message_append_strv(reply, owners); + if (r < 0) + return r; + + return sd_bus_send(bus, reply, NULL); +} + +static int driver_name_has_owner(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + char *arg0; + int r; + + r = sd_bus_message_read(m, "s", &arg0); + if (r < 0) + return r; + + r = sd_bus_get_owner(bus, arg0, 0, NULL); + if (r < 0 && r != -ENOENT) + return r; + + return sd_bus_reply_method_return(m, "b", r == 0); +} + +static int driver_request_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + struct kdbus_cmd_name *cmd_name; + uint32_t flags; + size_t size; + uint64_t id; + char *name; + int r; + + r = sd_bus_message_read(m, "su", &name, &flags); + if (r < 0) + return r; + + size = sizeof(*cmd_name) + strlen(name) + 1; + + cmd_name = alloca(size); + memset(cmd_name, 0, size); + strcpy(cmd_name->name, name); + cmd_name->size = size; + kdbus_translate_request_name_flags(flags, (uint64_t *) &cmd_name->conn_flags); + + /* This function is open-coded because we request the name 'on behalf' + * of the requesting connection */ + r = bus_kernel_parse_unique_name(m->sender, &id); + if (r < 0) + return r; + + cmd_name->id = id; + + r = ioctl(sd_bus_get_fd(bus), KDBUS_CMD_NAME_ACQUIRE, cmd_name); + if (r < 0) + return r; + + return sd_bus_reply_method_return(m, "u", 0); +} + +static int driver_start_service_by_name(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + char *s; + int r; + + return sd_bus_reply_method_return(m, "u", 2); + + r = sd_bus_message_read(m, "s", &s); + if (r < 0) + return r; + + /* FIXME */ + + return sd_bus_send(bus, reply, NULL); +} + +static int driver_update_env(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_NOT_SUPPORTED, + "UpdateActivationEnvironment is unsupported"); +} + +static int driver_reload_config(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *error) { + + return sd_bus_reply_method_errorf(m, SD_BUS_ERROR_NOT_SUPPORTED, + "ReloadConfig is unsupported"); +} + +const sd_bus_vtable dbus_vtable[] = { + SD_BUS_VTABLE_START(0), + SD_BUS_METHOD("AddMatch", "s", NULL, driver_add_match, 0), + SD_BUS_METHOD("GetConnectionSELinuxSecurityContext", "s", "ay", driver_get_security_ctx, 0), + SD_BUS_METHOD("GetConnectionUnixProcessID", "s", "u", driver_get_pid, 0), + SD_BUS_METHOD("GetConnectionUnixUser", "s", "u", driver_get_user, 0), + SD_BUS_METHOD("GetId", NULL, "s", driver_get_id, 0), + SD_BUS_METHOD("GetNameOwner", "s", "s", driver_get_name_owner, 0), + SD_BUS_METHOD("Hello", NULL, "s", driver_hello, 0), + SD_BUS_METHOD("ListActivatableNames", NULL, "as", driver_list_activatable_names, 0), + SD_BUS_METHOD("ListNames", NULL, "as", driver_list_names, 0), + SD_BUS_METHOD("ListQueuedOwners", "s", "as", driver_list_queued_owners, 0), + SD_BUS_METHOD("NameHasOwner", "s", "b", driver_name_has_owner, 0), + SD_BUS_METHOD("ReloadConfig", NULL, NULL, driver_reload_config, 0), + SD_BUS_METHOD("RemoveMatch", "s", NULL, driver_remove_match, 0), + SD_BUS_METHOD("RequestName", "su", "u", driver_request_name, 0), + SD_BUS_METHOD("StartServiceByName", "su", "u", driver_start_service_by_name, 0), + SD_BUS_METHOD("UpdateActivationEnvironment", "a{ss}", NULL, driver_update_env, 0), + SD_BUS_SIGNAL("NameAcquired", "s", 0), + SD_BUS_SIGNAL("NameLost", "s", 0), + SD_BUS_SIGNAL("NameOwnerChanged", "sss", 0), + SD_BUS_VTABLE_END +}; + +static int driver_main(const char *bus_name) { + + _cleanup_event_source_unref_ sd_event_source *w_accept = NULL; + _cleanup_event_source_unref_ sd_event_source *w_root_service = NULL; + _cleanup_event_unref_ sd_event *e = NULL; + int r; + + r = sd_event_new(&e); + if (r < 0) { + log_error("Failed to allocate event loop: %s", strerror(-r)); + return r; + } + + /* set up kernel bus connection */ + r = sd_bus_new(&driver_bus); + if (r < 0) { + log_error("Failed to create bus: %s", strerror(-r)); + return r; + } + + r = sd_bus_set_address(driver_bus, bus_name); + if (r < 0) { + log_error("Failed to create bus: %s", strerror(-r)); + return r; + } + + r = sd_bus_start(driver_bus); + if (r < 0) { + log_error("Failed to start kernel bus: %s", strerror(-r)); + return r; + } + + r = sd_bus_request_name(driver_bus, DBUS_INTERFACE, 0); + if (r < 0) { + log_error("Unable to request name '%s': %s\n", DBUS_INTERFACE, strerror(-r)); + return r; + } + + r = sd_bus_add_object_vtable(driver_bus, DBUS_PATH, DBUS_INTERFACE, dbus_vtable, NULL); + if (r < 0) { + log_error("Failed to add manager object vtable: %s", strerror(-r)); + return r; + } + + r = sd_bus_attach_event(driver_bus, e, 0); + if (r < 0) { + log_error("Error %d while adding bus to even: %s", r, strerror(-r)); + return r; + } + + log_debug("Entering main loop."); + + return sd_event_loop(e); +} + +int main(int argc, char *argv[]) { + char *bus_name; + int r; + + setlocale(LC_ALL, ""); + log_parse_environment(); + log_open(); + + r = parse_argv(argc, argv); + if (r <= 0) + return r; + + if (argc <= optind) { + help(); + return -EINVAL; + } + + r = asprintf(&bus_name, "kernel:path=%s", argv[optind]); + if (r < 0) + return r; + + return driver_main(bus_name); +} |