diff options
Diffstat (limited to 'src/libsystemd/sd-bus/bus-control.c')
| -rw-r--r-- | src/libsystemd/sd-bus/bus-control.c | 1217 |
1 files changed, 1217 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-control.c b/src/libsystemd/sd-bus/bus-control.c new file mode 100644 index 0000000000..e7e9ba07b0 --- /dev/null +++ b/src/libsystemd/sd-bus/bus-control.c @@ -0,0 +1,1217 @@ +/*-*- 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/>. +***/ + +#ifdef HAVE_VALGRIND_MEMCHECK_H +#include <valgrind/memcheck.h> +#endif + +#include <stddef.h> +#include <errno.h> + +#include "strv.h" +#include "sd-bus.h" +#include "bus-internal.h" +#include "bus-message.h" +#include "bus-control.h" +#include "bus-bloom.h" +#include "bus-util.h" +#include "cgroup-util.h" + +_public_ int sd_bus_get_unique_name(sd_bus *bus, const char **unique) { + int r; + + assert_return(bus, -EINVAL); + assert_return(unique, -EINVAL); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = bus_ensure_running(bus); + if (r < 0) + return r; + + *unique = bus->unique_name; + return 0; +} + +static int bus_request_name_kernel(sd_bus *bus, const char *name, uint64_t flags) { + struct kdbus_cmd_name *n; + size_t size, l; + int r; + + assert(bus); + assert(name); + + l = strlen(name); + size = offsetof(struct kdbus_cmd_name, name) + l + 1; + n = alloca0(size); + n->size = size; + kdbus_translate_request_name_flags(flags, (uint64_t *) &n->flags); + memcpy(n->name, name, l+1); + +#ifdef HAVE_VALGRIND_MEMCHECK_H + VALGRIND_MAKE_MEM_DEFINED(n, n->size); +#endif + + r = ioctl(bus->input_fd, KDBUS_CMD_NAME_ACQUIRE, n); + if (r < 0) + return -errno; + + if (n->flags & KDBUS_NAME_IN_QUEUE) + return 0; + + return 1; +} + +static int bus_request_name_dbus1(sd_bus *bus, const char *name, uint64_t flags) { + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + uint32_t ret, param = 0; + int r; + + assert(bus); + assert(name); + + if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) + param |= BUS_NAME_ALLOW_REPLACEMENT; + if (flags & SD_BUS_NAME_REPLACE_EXISTING) + param |= BUS_NAME_REPLACE_EXISTING; + if (!(flags & SD_BUS_NAME_QUEUE)) + param |= BUS_NAME_DO_NOT_QUEUE; + + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "RequestName", + NULL, + &reply, + "su", + name, + param); + if (r < 0) + return r; + + r = sd_bus_message_read(reply, "u", &ret); + if (r < 0) + return r; + + if (ret == BUS_NAME_ALREADY_OWNER) + return -EALREADY; + else if (ret == BUS_NAME_EXISTS) + return -EEXIST; + else if (ret == BUS_NAME_IN_QUEUE) + return 0; + else if (ret == BUS_NAME_PRIMARY_OWNER) + return 1; + + return -EIO; +} + +_public_ int sd_bus_request_name(sd_bus *bus, const char *name, uint64_t flags) { + assert_return(bus, -EINVAL); + assert_return(name, -EINVAL); + assert_return(bus->bus_client, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(!(flags & ~(SD_BUS_NAME_ALLOW_REPLACEMENT|SD_BUS_NAME_REPLACE_EXISTING|SD_BUS_NAME_QUEUE)), -EINVAL); + assert_return(service_name_is_valid(name), -EINVAL); + assert_return(name[0] != ':', -EINVAL); + + if (bus->is_kernel) + return bus_request_name_kernel(bus, name, flags); + else + return bus_request_name_dbus1(bus, name, flags); +} + +static int bus_release_name_kernel(sd_bus *bus, const char *name) { + struct kdbus_cmd_name *n; + size_t l; + int r; + + assert(bus); + assert(name); + + l = strlen(name); + n = alloca0(offsetof(struct kdbus_cmd_name, name) + l + 1); + n->size = offsetof(struct kdbus_cmd_name, name) + l + 1; + memcpy(n->name, name, l+1); + +#ifdef HAVE_VALGRIND_MEMCHECK_H + VALGRIND_MAKE_MEM_DEFINED(n, n->size); +#endif + r = ioctl(bus->input_fd, KDBUS_CMD_NAME_RELEASE, n); + if (r < 0) + return -errno; + + return n->flags; +} + +static int bus_release_name_dbus1(sd_bus *bus, const char *name) { + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + uint32_t ret; + int r; + + assert(bus); + assert(name); + + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "ReleaseName", + NULL, + &reply, + "s", + name); + if (r < 0) + return r; + + r = sd_bus_message_read(reply, "u", &ret); + if (r < 0) + return r; + if (ret == BUS_NAME_NON_EXISTENT) + return -ESRCH; + if (ret == BUS_NAME_NOT_OWNER) + return -EADDRINUSE; + if (ret == BUS_NAME_RELEASED) + return 0; + + return -EINVAL; +} + +_public_ int sd_bus_release_name(sd_bus *bus, const char *name) { + assert_return(bus, -EINVAL); + assert_return(name, -EINVAL); + assert_return(bus->bus_client, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(service_name_is_valid(name), -EINVAL); + assert_return(name[0] != ':', -EINVAL); + + if (bus->is_kernel) + return bus_release_name_kernel(bus, name); + else + return bus_release_name_dbus1(bus, name); +} + +static int kernel_get_list(sd_bus *bus, uint64_t flags, char ***x) { + struct kdbus_cmd_name_list cmd = {}; + struct kdbus_name_list *name_list; + struct kdbus_cmd_name *name; + uint64_t previous_id = 0; + int r; + + /* Caller will free half-constructed list on failure... */ + + cmd.flags = flags; + + 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 ((flags & KDBUS_NAME_LIST_UNIQUE) && name->owner_id != previous_id) { + char *n; + + if (asprintf(&n, ":1.%llu", (unsigned long long) name->owner_id) < 0) + return -ENOMEM; + + r = strv_push(x, n); + if (r < 0) { + free(n); + return -ENOMEM; + } + + previous_id = name->owner_id; + } + + if (name->size > sizeof(*name) && service_name_is_valid(name->name)) { + r = strv_extend(x, name->name); + if (r < 0) + return -ENOMEM; + } + } + + r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd.offset); + if (r < 0) + return -errno; + + return 0; +} + +static int bus_list_names_kernel(sd_bus *bus, char ***acquired, char ***activatable) { + _cleanup_strv_free_ char **x = NULL, **y = NULL; + int r; + + if (acquired) { + r = kernel_get_list(bus, KDBUS_NAME_LIST_UNIQUE | KDBUS_NAME_LIST_NAMES, &x); + if (r < 0) + return r; + } + + if (activatable) { + r = kernel_get_list(bus, KDBUS_NAME_LIST_ACTIVATORS, &y); + if (r < 0) + return r; + + *activatable = y; + y = NULL; + } + + if (acquired) { + *acquired = x; + x = NULL; + } + + return 0; +} + +static int bus_list_names_dbus1(sd_bus *bus, char ***acquired, char ***activatable) { + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + _cleanup_strv_free_ char **x = NULL, **y = NULL; + int r; + + if (acquired) { + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "ListNames", + NULL, + &reply, + NULL); + if (r < 0) + return r; + + r = sd_bus_message_read_strv(reply, &x); + if (r < 0) + return r; + + reply = sd_bus_message_unref(reply); + } + + if (activatable) { + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "ListActivatableNames", + NULL, + &reply, + NULL); + if (r < 0) + return r; + + r = sd_bus_message_read_strv(reply, &y); + if (r < 0) + return r; + + *activatable = y; + y = NULL; + } + + if (acquired) { + *acquired = x; + x = NULL; + } + + return 0; +} + +_public_ int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable) { + assert_return(bus, -EINVAL); + assert_return(acquired || activatable, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + if (bus->is_kernel) + return bus_list_names_kernel(bus, acquired, activatable); + else + return bus_list_names_dbus1(bus, acquired, activatable); +} + +static int bus_get_owner_kdbus( + sd_bus *bus, + const char *name, + uint64_t mask, + sd_bus_creds **creds) { + + _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL; + struct kdbus_cmd_conn_info *cmd; + struct kdbus_conn_info *conn_info; + struct kdbus_item *item; + size_t size; + uint64_t m, id; + int r; + + r = bus_kernel_parse_unique_name(name, &id); + if (r < 0) + return r; + if (r > 0) { + size = offsetof(struct kdbus_cmd_conn_info, name); + cmd = alloca0(size); + cmd->id = id; + } else { + size = offsetof(struct kdbus_cmd_conn_info, name) + strlen(name) + 1; + cmd = alloca0(size); + strcpy(cmd->name, name); + } + cmd->flags = KDBUS_ATTACH_NAMES; + + cmd->size = size; + r = ioctl(bus->input_fd, KDBUS_CMD_CONN_INFO, cmd); + if (r < 0) + return -errno; + + conn_info = (struct kdbus_conn_info *) ((uint8_t *) bus->kdbus_buffer + cmd->offset); + + /* Non-activated names are considered not available */ + if (conn_info->flags & KDBUS_HELLO_ACTIVATOR) + return name[0] == ':' ? -ENXIO : -ENOENT; + + c = bus_creds_new(); + if (!c) + return -ENOMEM; + + if (mask & SD_BUS_CREDS_UNIQUE_NAME) { + if (asprintf(&c->unique_name, ":1.%llu", (unsigned long long) conn_info->id) < 0) + return -ENOMEM; + + c->mask |= SD_BUS_CREDS_UNIQUE_NAME; + } + + KDBUS_ITEM_FOREACH(item, conn_info, items) { + + switch (item->type) { + + case KDBUS_ITEM_CREDS: + m = (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID | SD_BUS_CREDS_PID) & mask; + + if (m) { + c->uid = (uid_t) item->creds.uid; + c->pid = (pid_t) item->creds.pid; + c->gid = (gid_t) item->creds.gid; + c->mask |= m; + } + + if (mask & SD_BUS_CREDS_TID && item->creds.tid > 0) { + c->tid = (pid_t) item->creds.tid; + c->mask |= SD_BUS_CREDS_TID; + } + + if (mask & SD_BUS_CREDS_PID_STARTTIME && item->creds.starttime > 0) { + c->pid_starttime = item->creds.starttime; + c->mask |= SD_BUS_CREDS_PID_STARTTIME; + } + + break; + + case KDBUS_ITEM_PID_COMM: + if (mask & SD_BUS_CREDS_COMM) { + c->comm = strdup(item->str); + if (!c->comm) { + r = -ENOMEM; + goto fail; + } + + c->mask |= SD_BUS_CREDS_COMM; + } + break; + + case KDBUS_ITEM_TID_COMM: + if (mask & SD_BUS_CREDS_TID_COMM) { + c->tid_comm = strdup(item->str); + if (!c->tid_comm) { + r = -ENOMEM; + goto fail; + } + + c->mask |= SD_BUS_CREDS_TID_COMM; + } + break; + + case KDBUS_ITEM_EXE: + if (mask & SD_BUS_CREDS_EXE) { + c->exe = strdup(item->str); + if (!c->exe) { + r = -ENOMEM; + goto fail; + } + + c->mask |= SD_BUS_CREDS_EXE; + } + break; + + case KDBUS_ITEM_CMDLINE: + if (mask & SD_BUS_CREDS_CMDLINE) { + c->cmdline_size = item->size - KDBUS_ITEM_HEADER_SIZE; + c->cmdline = memdup(item->data, c->cmdline_size); + if (!c->cmdline) { + r = -ENOMEM; + goto fail; + } + + c->mask |= SD_BUS_CREDS_CMDLINE; + } + break; + + case KDBUS_ITEM_CGROUP: + m = (SD_BUS_CREDS_CGROUP | SD_BUS_CREDS_UNIT | + SD_BUS_CREDS_USER_UNIT | SD_BUS_CREDS_SLICE | + SD_BUS_CREDS_SESSION | SD_BUS_CREDS_OWNER_UID) & mask; + + if (m) { + c->cgroup = strdup(item->str); + if (!c->cgroup) { + r = -ENOMEM; + goto fail; + } + + if (!bus->cgroup_root) { + r = cg_get_root_path(&bus->cgroup_root); + if (r < 0) + goto fail; + } + + c->cgroup_root = strdup(bus->cgroup_root); + if (!c->cgroup_root) { + r = -ENOMEM; + goto fail; + } + + c->mask |= m; + } + break; + + case KDBUS_ITEM_CAPS: + m = (SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_PERMITTED_CAPS | + SD_BUS_CREDS_INHERITABLE_CAPS | SD_BUS_CREDS_BOUNDING_CAPS) & mask; + + if (m) { + c->capability_size = item->size - KDBUS_ITEM_HEADER_SIZE; + c->capability = memdup(item->data, c->capability_size); + if (!c->capability) { + r = -ENOMEM; + goto fail; + } + + c->mask |= m; + } + break; + + case KDBUS_ITEM_SECLABEL: + if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) { + c->label = strdup(item->str); + if (!c->label) { + r = -ENOMEM; + goto fail; + } + + c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT; + } + break; + + case KDBUS_ITEM_AUDIT: + m = (SD_BUS_CREDS_AUDIT_SESSION_ID | SD_BUS_CREDS_AUDIT_LOGIN_UID) & mask; + + if (m) { + c->audit_session_id = item->audit.sessionid; + c->audit_login_uid = item->audit.loginuid; + c->mask |= m; + } + break; + + case KDBUS_ITEM_NAME: + if ((mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) && service_name_is_valid(item->name.name)) { + r = strv_extend(&c->well_known_names, item->name.name); + if (r < 0) + goto fail; + + c->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; + } + break; + } + } + + if (creds) { + *creds = c; + c = NULL; + } + + r = 0; + +fail: + ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd->offset); + return r; +} + +static int bus_get_owner_dbus1( + sd_bus *bus, + const char *name, + uint64_t mask, + sd_bus_creds **creds) { + + _cleanup_bus_message_unref_ sd_bus_message *reply_unique = NULL, *reply = NULL; + _cleanup_bus_creds_unref_ sd_bus_creds *c = NULL; + const char *unique = NULL; + pid_t pid = 0; + int r; + + /* Only query the owner if the caller wants to know it or if + * the caller just wants to check whether a name exists */ + if ((mask & SD_BUS_CREDS_UNIQUE_NAME) || mask == 0) { + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "GetNameOwner", + NULL, + &reply_unique, + "s", + name); + if (r < 0) + return r; + + r = sd_bus_message_read(reply_unique, "s", &unique); + if (r < 0) + return r; + } + + if (mask != 0) { + c = bus_creds_new(); + if (!c) + return -ENOMEM; + + if ((mask & SD_BUS_CREDS_UNIQUE_NAME) && unique) { + c->unique_name = strdup(unique); + if (!c->unique_name) + return -ENOMEM; + + c->mask |= SD_BUS_CREDS_UNIQUE_NAME; + } + + if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_GID| + SD_BUS_CREDS_COMM|SD_BUS_CREDS_EXE|SD_BUS_CREDS_CMDLINE| + SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID| + SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS| + SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) { + uint32_t u; + + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "GetConnectionUnixProcessID", + NULL, + &reply, + "s", + unique ? unique : name); + if (r < 0) + return r; + + r = sd_bus_message_read(reply, "u", &u); + if (r < 0) + return r; + + pid = u; + if (mask & SD_BUS_CREDS_PID) { + c->pid = u; + c->mask |= SD_BUS_CREDS_PID; + } + + reply = sd_bus_message_unref(reply); + } + + if (mask & SD_BUS_CREDS_UID) { + uint32_t u; + + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "GetConnectionUnixUser", + NULL, + &reply, + "s", + unique ? unique : name); + if (r < 0) + return r; + + r = sd_bus_message_read(reply, "u", &u); + if (r < 0) + return r; + + c->uid = u; + c->mask |= SD_BUS_CREDS_UID; + + reply = sd_bus_message_unref(reply); + } + + if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) { + const void *p; + size_t sz; + + r = sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "GetConnectionSELinuxSecurityContext", + NULL, + &reply, + "s", + unique ? unique : name); + if (r < 0) + return r; + + r = sd_bus_message_read_array(reply, 'y', &p, &sz); + if (r < 0) + return r; + + c->label = strndup(p, sz); + if (!c->label) + return -ENOMEM; + + c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT; + } + + r = bus_creds_add_more(c, mask, pid, 0); + if (r < 0) + return r; + } + + if (creds) { + *creds = c; + c = NULL; + } + + return 0; +} + +_public_ int sd_bus_get_owner( + sd_bus *bus, + const char *name, + uint64_t mask, + sd_bus_creds **creds) { + + assert_return(bus, -EINVAL); + assert_return(name, -EINVAL); + assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP); + assert_return(mask == 0 || creds, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(service_name_is_valid(name), -EINVAL); + assert_return(bus->bus_client, -ENODATA); + + if (bus->is_kernel) + return bus_get_owner_kdbus(bus, name, mask, creds); + else + return bus_get_owner_dbus1(bus, name, mask, creds); +} + +static int add_name_change_match(sd_bus *bus, + uint64_t cookie, + const char *name, + const char *old_owner, + const char *new_owner) { + + uint64_t name_id = KDBUS_MATCH_ID_ANY, old_owner_id = 0, new_owner_id = 0; + int is_name_id = -1, r; + struct kdbus_item *item; + + assert(bus); + + /* If we encounter a match that could match against + * NameOwnerChanged messages, then we need to create + * KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} and + * KDBUS_ITEM_ID_{ADD,REMOVE} matches for it, possibly + * multiple if the match is underspecified. + * + * The NameOwnerChanged signals take three parameters with + * unique or well-known names, but only some forms actually + * exist: + * + * WELLKNOWN, "", UNIQUE → KDBUS_ITEM_NAME_ADD + * WELLKNOWN, UNIQUE, "" → KDBUS_ITEM_NAME_REMOVE + * WELLKNOWN, UNIQUE, UNIQUE → KDBUS_ITEM_NAME_CHANGE + * UNIQUE, "", UNIQUE → KDBUS_ITEM_ID_ADD + * UNIQUE, UNIQUE, "" → KDBUS_ITEM_ID_REMOVE + * + * For the latter two the two unique names must be identical. + * + * */ + + if (name) { + is_name_id = bus_kernel_parse_unique_name(name, &name_id); + if (is_name_id < 0) + return 0; + } + + if (!isempty(old_owner)) { + r = bus_kernel_parse_unique_name(old_owner, &old_owner_id); + if (r < 0) + return 0; + if (r == 0) + return 0; + if (is_name_id > 0 && old_owner_id != name_id) + return 0; + } else + old_owner_id = KDBUS_MATCH_ID_ANY; + + if (!isempty(new_owner)) { + r = bus_kernel_parse_unique_name(new_owner, &new_owner_id); + if (r < 0) + return r; + if (r == 0) + return 0; + if (is_name_id > 0 && new_owner_id != name_id) + return 0; + } else + new_owner_id = KDBUS_MATCH_ID_ANY; + + if (is_name_id <= 0) { + struct kdbus_cmd_match *m; + size_t sz, l; + + /* If the name argument is missing or is a well-known + * name, then add KDBUS_ITEM_NAME_{ADD,REMOVE,CHANGE} + * matches for it */ + + l = name ? strlen(name) + 1 : 0; + + sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) + + offsetof(struct kdbus_item, name_change) + + offsetof(struct kdbus_notify_name_change, name) + + l); + + m = alloca0(sz); + m->size = sz; + m->cookie = cookie; + + item = m->items; + item->size = + offsetof(struct kdbus_item, name_change) + + offsetof(struct kdbus_notify_name_change, name) + + l; + + item->name_change.old.id = old_owner_id; + item->name_change.new.id = new_owner_id; + + if (name) + memcpy(item->name_change.name, name, l); + + /* If the old name is unset or empty, then + * this can match against added names */ + if (!old_owner || old_owner[0] == 0) { + item->type = KDBUS_ITEM_NAME_ADD; + + r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m); + if (r < 0) + return -errno; + } + + /* If the new name is unset or empty, then + * this can match against removed names */ + if (!new_owner || new_owner[0] == 0) { + item->type = KDBUS_ITEM_NAME_REMOVE; + + r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m); + if (r < 0) + return -errno; + } + + /* The CHANGE match we need in either case, because + * what is reported as a name change by the kernel + * might just be an owner change between starter and + * normal clients. For userspace such a change should + * be considered a removal/addition, hence let's + * subscribe to this unconditionally. */ + item->type = KDBUS_ITEM_NAME_CHANGE; + r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m); + if (r < 0) + return -errno; + } + + if (is_name_id != 0) { + struct kdbus_cmd_match *m; + uint64_t sz; + + /* If the name argument is missing or is a unique + * name, then add KDBUS_ITEM_ID_{ADD,REMOVE} matches + * for it */ + + sz = ALIGN8(offsetof(struct kdbus_cmd_match, items) + + offsetof(struct kdbus_item, id_change) + + sizeof(struct kdbus_notify_id_change)); + + m = alloca0(sz); + m->size = sz; + m->cookie = cookie; + + item = m->items; + item->size = + offsetof(struct kdbus_item, id_change) + + sizeof(struct kdbus_notify_id_change); + item->id_change.id = name_id; + + /* If the old name is unset or empty, then this can + * match against added ids */ + if (!old_owner || old_owner[0] == 0) { + item->type = KDBUS_ITEM_ID_ADD; + + r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m); + if (r < 0) + return -errno; + } + + /* If thew new name is unset or empty, then this can + * match against removed ids */ + if (!new_owner || new_owner[0] == 0) { + item->type = KDBUS_ITEM_ID_REMOVE; + + r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m); + if (r < 0) + return -errno; + } + } + + return 0; +} + +int bus_add_match_internal_kernel( + sd_bus *bus, + uint64_t id, + struct bus_match_component *components, + unsigned n_components, + uint64_t cookie) { + + struct kdbus_cmd_match *m; + struct kdbus_item *item; + uint64_t bloom[BLOOM_SIZE/8]; + size_t sz; + const char *sender = NULL; + size_t sender_length = 0; + uint64_t src_id = KDBUS_MATCH_ID_ANY; + bool using_bloom = false; + unsigned i; + bool matches_name_change = true; + const char *name_change_arg[3] = {}; + int r; + + assert(bus); + + zero(bloom); + + sz = ALIGN8(offsetof(struct kdbus_cmd_match, items)); + + for (i = 0; i < n_components; i++) { + struct bus_match_component *c = &components[i]; + + switch (c->type) { + + case BUS_MATCH_SENDER: + if (!streq(c->value_str, "org.freedesktop.DBus")) + matches_name_change = false; + + r = bus_kernel_parse_unique_name(c->value_str, &src_id); + if (r < 0) + return r; + else if (r > 0) + sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t)); + else { + sender = c->value_str; + sender_length = strlen(sender); + sz += ALIGN8(offsetof(struct kdbus_item, str) + sender_length + 1); + } + + break; + + case BUS_MATCH_MESSAGE_TYPE: + if (c->value_u8 != SD_BUS_MESSAGE_SIGNAL) + matches_name_change = false; + + bloom_add_pair(bloom, "message-type", bus_message_type_to_string(c->value_u8)); + using_bloom = true; + break; + + case BUS_MATCH_INTERFACE: + if (!streq(c->value_str, "org.freedesktop.DBus")) + matches_name_change = false; + + bloom_add_pair(bloom, "interface", c->value_str); + using_bloom = true; + break; + + case BUS_MATCH_MEMBER: + if (!streq(c->value_str, "NameOwnerChanged")) + matches_name_change = false; + + bloom_add_pair(bloom, "member", c->value_str); + using_bloom = true; + break; + + case BUS_MATCH_PATH: + if (!streq(c->value_str, "/org/freedesktop/DBus")) + matches_name_change = false; + + bloom_add_pair(bloom, "path", c->value_str); + using_bloom = true; + break; + + case BUS_MATCH_PATH_NAMESPACE: + if (!streq(c->value_str, "/")) { + bloom_add_pair(bloom, "path-slash-prefix", c->value_str); + using_bloom = true; + } + break; + + case BUS_MATCH_ARG...BUS_MATCH_ARG_LAST: { + char buf[sizeof("arg")-1 + 2 + 1]; + + if (c->type - BUS_MATCH_ARG < 3) + name_change_arg[c->type - BUS_MATCH_ARG] = c->value_str; + + snprintf(buf, sizeof(buf), "arg%u", c->type - BUS_MATCH_ARG); + bloom_add_pair(bloom, buf, c->value_str); + using_bloom = true; + break; + } + + case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: { + char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; + + snprintf(buf, sizeof(buf), "arg%u-slash-prefix", c->type - BUS_MATCH_ARG_PATH); + bloom_add_pair(bloom, buf, c->value_str); + using_bloom = true; + break; + } + + case BUS_MATCH_ARG_NAMESPACE...BUS_MATCH_ARG_NAMESPACE_LAST: { + char buf[sizeof("arg")-1 + 2 + sizeof("-dot-prefix")]; + + snprintf(buf, sizeof(buf), "arg%u-dot-prefix", c->type - BUS_MATCH_ARG_NAMESPACE); + bloom_add_pair(bloom, buf, c->value_str); + using_bloom = true; + break; + } + + case BUS_MATCH_DESTINATION: + /* The bloom filter does not include + the destination, since it is only + available for broadcast messages + which do not carry a destination + since they are undirected. */ + break; + + case BUS_MATCH_ROOT: + case BUS_MATCH_VALUE: + case BUS_MATCH_LEAF: + case _BUS_MATCH_NODE_TYPE_MAX: + case _BUS_MATCH_NODE_TYPE_INVALID: + assert_not_reached("Invalid match type?"); + } + } + + if (using_bloom) + sz += ALIGN8(offsetof(struct kdbus_item, data64) + BLOOM_SIZE); + + m = alloca0(sz); + m->size = sz; + m->cookie = cookie; + m->owner_id = id; + + item = m->items; + + if (src_id != KDBUS_MATCH_ID_ANY) { + item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t); + item->type = KDBUS_ITEM_ID; + item->id = src_id; + item = KDBUS_ITEM_NEXT(item); + } + + if (using_bloom) { + item->size = offsetof(struct kdbus_item, data64) + BLOOM_SIZE; + item->type = KDBUS_ITEM_BLOOM; + memcpy(item->data64, bloom, BLOOM_SIZE); + item = KDBUS_ITEM_NEXT(item); + } + + if (sender) { + item->size = offsetof(struct kdbus_item, str) + sender_length + 1; + item->type = KDBUS_ITEM_NAME; + memcpy(item->str, sender, sender_length + 1); + } + + r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_ADD, m); + if (r < 0) + return -errno; + + if (matches_name_change) { + + /* If this match could theoretically match + * NameOwnerChanged messages, we need to + * install a second non-bloom filter explitly + * for it */ + + r = add_name_change_match(bus, cookie, name_change_arg[0], name_change_arg[1], name_change_arg[2]); + if (r < 0) + return r; + } + + return 0; +} + +static int bus_add_match_internal_dbus1( + sd_bus *bus, + const char *match) { + + assert(bus); + assert(match); + + return sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "AddMatch", + NULL, + NULL, + "s", + match); +} + +int bus_add_match_internal( + sd_bus *bus, + const char *match, + struct bus_match_component *components, + unsigned n_components, + uint64_t cookie) { + + assert(bus); + assert(match); + + if (bus->is_kernel) + return bus_add_match_internal_kernel(bus, 0, components, n_components, cookie); + else + return bus_add_match_internal_dbus1(bus, match); +} + +int bus_remove_match_internal_kernel( + sd_bus *bus, + uint64_t id, + uint64_t cookie) { + + struct kdbus_cmd_match m; + int r; + + assert(bus); + + zero(m); + m.size = offsetof(struct kdbus_cmd_match, items); + m.cookie = cookie; + m.owner_id = id; + + r = ioctl(bus->input_fd, KDBUS_CMD_MATCH_REMOVE, &m); + if (r < 0) + return -errno; + + return 0; +} + +static int bus_remove_match_internal_dbus1( + sd_bus *bus, + const char *match) { + + assert(bus); + assert(match); + + return sd_bus_call_method( + bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus", + "RemoveMatch", + NULL, + NULL, + "s", + match); +} + +int bus_remove_match_internal( + sd_bus *bus, + const char *match, + uint64_t cookie) { + + assert(bus); + assert(match); + + if (bus->is_kernel) + return bus_remove_match_internal_kernel(bus, 0, cookie); + else + return bus_remove_match_internal_dbus1(bus, match); +} + +_public_ int sd_bus_get_owner_machine_id(sd_bus *bus, const char *name, sd_id128_t *machine) { + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *m = NULL; + const char *mid; + int r; + + assert_return(bus, -EINVAL); + assert_return(name, -EINVAL); + assert_return(machine, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + assert_return(service_name_is_valid(name), -EINVAL); + + if (streq_ptr(name, bus->unique_name)) + return sd_id128_get_machine(machine); + + r = sd_bus_message_new_method_call( + bus, + name, + "/", + "org.freedesktop.DBus.Peer", + "GetMachineId", &m); + if (r < 0) + return r; + + r = sd_bus_message_set_no_auto_start(m, true); + if (r < 0) + return r; + + r = sd_bus_call(bus, m, 0, NULL, &reply); + if (r < 0) + return r; + + r = sd_bus_message_read(reply, "s", &mid); + if (r < 0) + return r; + + return sd_id128_from_string(mid, machine); +} |