summaryrefslogtreecommitdiff
path: root/src/libsystemd/src/sd-bus/bus-kernel.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libsystemd/src/sd-bus/bus-kernel.c')
-rw-r--r--src/libsystemd/src/sd-bus/bus-kernel.c1783
1 files changed, 1783 insertions, 0 deletions
diff --git a/src/libsystemd/src/sd-bus/bus-kernel.c b/src/libsystemd/src/sd-bus/bus-kernel.c
new file mode 100644
index 0000000000..3321a54a51
--- /dev/null
+++ b/src/libsystemd/src/sd-bus/bus-kernel.c
@@ -0,0 +1,1783 @@
+/***
+ 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 <fcntl.h>
+#include <malloc.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+
+/* When we include libgen.h because we need dirname() we immediately
+ * undefine basename() since libgen.h defines it as a macro to the POSIX
+ * version which is really broken. We prefer GNU basename(). */
+#include <libgen.h>
+#undef basename
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/bus-label.h"
+#include "systemd-basic/capability-util.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/memfd-util.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/stdio-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/strv.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-basic/util.h"
+
+#include "bus-bloom.h"
+#include "bus-internal.h"
+#include "bus-kernel.h"
+#include "bus-message.h"
+#include "bus-util.h"
+
+#define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
+
+int bus_kernel_parse_unique_name(const char *s, uint64_t *id) {
+ int r;
+
+ assert(s);
+ assert(id);
+
+ if (!startswith(s, ":1."))
+ return 0;
+
+ r = safe_atou64(s + 3, id);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) {
+ assert(d);
+ assert(sz > 0);
+
+ *d = ALIGN8_PTR(*d);
+
+ /* Note that p can be NULL, which encodes a region full of
+ * zeroes, which is useful to optimize certain padding
+ * conditions */
+
+ (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec);
+ (*d)->type = KDBUS_ITEM_PAYLOAD_VEC;
+ (*d)->vec.address = PTR_TO_UINT64(p);
+ (*d)->vec.size = sz;
+
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
+}
+
+static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) {
+ assert(d);
+ assert(memfd >= 0);
+ assert(sz > 0);
+
+ *d = ALIGN8_PTR(*d);
+ (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd);
+ (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD;
+ (*d)->memfd.fd = memfd;
+ (*d)->memfd.start = start;
+ (*d)->memfd.size = sz;
+
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
+}
+
+static void append_destination(struct kdbus_item **d, const char *s, size_t length) {
+ assert(d);
+ assert(s);
+
+ *d = ALIGN8_PTR(*d);
+
+ (*d)->size = offsetof(struct kdbus_item, str) + length + 1;
+ (*d)->type = KDBUS_ITEM_DST_NAME;
+ memcpy((*d)->str, s, length + 1);
+
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
+}
+
+static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) {
+ struct kdbus_item *i;
+
+ assert(d);
+
+ i = ALIGN8_PTR(*d);
+
+ i->size = offsetof(struct kdbus_item, bloom_filter) +
+ offsetof(struct kdbus_bloom_filter, data) +
+ length;
+ i->type = KDBUS_ITEM_BLOOM_FILTER;
+
+ *d = (struct kdbus_item *) ((uint8_t*) i + i->size);
+
+ return &i->bloom_filter;
+}
+
+static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) {
+ assert(d);
+ assert(fds);
+ assert(n_fds > 0);
+
+ *d = ALIGN8_PTR(*d);
+ (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds;
+ (*d)->type = KDBUS_ITEM_FDS;
+ memcpy((*d)->fds, fds, sizeof(int) * n_fds);
+
+ *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size);
+}
+
+static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) {
+ char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
+ char *e;
+
+ assert(data);
+ assert(size > 0);
+ assert(i < 64);
+ assert(t);
+
+ e = stpcpy(buf, "arg");
+ if (i < 10)
+ *(e++) = '0' + (char) i;
+ else {
+ *(e++) = '0' + (char) (i / 10);
+ *(e++) = '0' + (char) (i % 10);
+ }
+
+ *e = 0;
+ bloom_add_pair(data, size, n_hash, buf, t);
+
+ strcpy(e, "-dot-prefix");
+ bloom_add_prefixes(data, size, n_hash, buf, t, '.');
+ strcpy(e, "-slash-prefix");
+ bloom_add_prefixes(data, size, n_hash, buf, t, '/');
+}
+
+static void add_bloom_arg_has(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) {
+ char buf[sizeof("arg")-1 + 2 + sizeof("-has")];
+ char *e;
+
+ assert(data);
+ assert(size > 0);
+ assert(i < 64);
+ assert(t);
+
+ e = stpcpy(buf, "arg");
+ if (i < 10)
+ *(e++) = '0' + (char) i;
+ else {
+ *(e++) = '0' + (char) (i / 10);
+ *(e++) = '0' + (char) (i % 10);
+ }
+
+ strcpy(e, "-has");
+ bloom_add_pair(data, size, n_hash, buf, t);
+}
+
+static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
+ void *data;
+ unsigned i;
+ int r;
+
+ assert(m);
+ assert(bloom);
+
+ data = bloom->data;
+ memzero(data, m->bus->bloom_size);
+ bloom->generation = 0;
+
+ bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type));
+
+ if (m->interface)
+ bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface);
+ if (m->member)
+ bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member);
+ if (m->path) {
+ bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path);
+ bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path);
+ bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/');
+ }
+
+ r = sd_bus_message_rewind(m, true);
+ if (r < 0)
+ return r;
+
+ for (i = 0; i < 64; i++) {
+ const char *t, *contents;
+ char type;
+
+ r = sd_bus_message_peek_type(m, &type, &contents);
+ if (r < 0)
+ return r;
+
+ if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) {
+
+ /* The bloom filter includes simple strings of any kind */
+ r = sd_bus_message_read_basic(m, type, &t);
+ if (r < 0)
+ return r;
+
+ add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
+ }
+
+ if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) {
+
+ /* As well as array of simple strings of any kinds */
+ r = sd_bus_message_enter_container(m, type, contents);
+ if (r < 0)
+ return r;
+
+ while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0)
+ add_bloom_arg_has(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return r;
+
+ } else
+ /* Stop adding to bloom filter as soon as we
+ * run into the first argument we cannot add
+ * to it. */
+ break;
+ }
+
+ return 0;
+}
+
+static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
+ struct bus_body_part *part;
+ struct kdbus_item *d;
+ const char *destination;
+ bool well_known = false;
+ uint64_t dst_id;
+ size_t sz, dl;
+ unsigned i;
+ int r;
+
+ assert(b);
+ assert(m);
+ assert(m->sealed);
+
+ /* We put this together only once, if this message is reused
+ * we reuse the earlier-built version */
+ if (m->kdbus)
+ return 0;
+
+ destination = m->destination ?: m->destination_ptr;
+
+ if (destination) {
+ r = bus_kernel_parse_unique_name(destination, &dst_id);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ well_known = true;
+
+ /* verify_destination_id will usually be 0, which makes the kernel
+ * driver only look at the provided well-known name. Otherwise,
+ * the kernel will make sure the provided destination id matches
+ * the owner of the provided well-known-name, and fail if they
+ * differ. Currently, this is only needed for bus-proxyd. */
+ dst_id = m->verify_destination_id;
+ }
+ } else
+ dst_id = KDBUS_DST_ID_BROADCAST;
+
+ sz = offsetof(struct kdbus_msg, items);
+
+ /* Add in fixed header, fields header and payload */
+ sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) +
+ MAX(sizeof(struct kdbus_vec),
+ sizeof(struct kdbus_memfd)));
+
+ /* Add space for bloom filter */
+ sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) +
+ offsetof(struct kdbus_bloom_filter, data) +
+ m->bus->bloom_size);
+
+ /* Add in well-known destination header */
+ if (well_known) {
+ dl = strlen(destination);
+ sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1);
+ }
+
+ /* Add space for unix fds */
+ if (m->n_fds > 0)
+ sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds);
+
+ m->kdbus = memalign(8, sz);
+ if (!m->kdbus) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ m->free_kdbus = true;
+ memzero(m->kdbus, sz);
+
+ m->kdbus->flags =
+ ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) |
+ ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) |
+ ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0);
+
+ m->kdbus->dst_id = dst_id;
+ m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
+ m->kdbus->cookie = m->header->dbus2.cookie;
+ m->kdbus->priority = m->priority;
+
+ if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
+ m->kdbus->cookie_reply = m->reply_cookie;
+ else {
+ struct timespec now;
+
+ assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0);
+ m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec +
+ m->timeout * NSEC_PER_USEC;
+ }
+
+ d = m->kdbus->items;
+
+ if (well_known)
+ append_destination(&d, destination, dl);
+
+ append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m));
+
+ MESSAGE_FOREACH_PART(part, i, m) {
+ if (part->is_zero) {
+ /* If this is padding then simply send a
+ * vector with a NULL data pointer which the
+ * kernel will just pass through. This is the
+ * most efficient way to encode zeroes */
+
+ append_payload_vec(&d, NULL, part->size);
+ continue;
+ }
+
+ if (part->memfd >= 0 && part->sealed && destination) {
+ /* Try to send a memfd, if the part is
+ * sealed and this is not a broadcast. Since we can only */
+
+ append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size);
+ continue;
+ }
+
+ /* Otherwise, let's send a vector to the actual data.
+ * For that, we need to map it first. */
+ r = bus_body_part_map(part);
+ if (r < 0)
+ goto fail;
+
+ append_payload_vec(&d, part->data, part->size);
+ }
+
+ if (m->header->type == SD_BUS_MESSAGE_SIGNAL) {
+ struct kdbus_bloom_filter *bloom;
+
+ bloom = append_bloom(&d, m->bus->bloom_size);
+ r = bus_message_setup_bloom(m, bloom);
+ if (r < 0)
+ goto fail;
+ }
+
+ if (m->n_fds > 0)
+ append_fds(&d, m->fds, m->n_fds);
+
+ m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus;
+ assert(m->kdbus->size <= sz);
+
+ return 0;
+
+fail:
+ m->poisoned = true;
+ return r;
+}
+
+static void unset_memfds(struct sd_bus_message *m) {
+ struct bus_body_part *part;
+ unsigned i;
+
+ assert(m);
+
+ /* Make sure the memfds are not freed twice */
+ MESSAGE_FOREACH_PART(part, i, m)
+ if (part->memfd >= 0)
+ part->memfd = -1;
+}
+
+static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) {
+ assert(bus);
+ assert(m);
+
+ if (!ts)
+ return;
+
+ if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP))
+ return;
+
+ m->realtime = ts->realtime_ns / NSEC_PER_USEC;
+ m->monotonic = ts->monotonic_ns / NSEC_PER_USEC;
+ m->seqnum = ts->seqnum;
+}
+
+static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
+ sd_bus_message *m = NULL;
+ struct kdbus_item *d;
+ unsigned n_fds = 0;
+ _cleanup_free_ int *fds = NULL;
+ struct bus_header *header = NULL;
+ void *footer = NULL;
+ size_t header_size = 0, footer_size = 0;
+ size_t n_bytes = 0, idx = 0;
+ const char *destination = NULL, *seclabel = NULL;
+ bool last_was_memfd = false;
+ int r;
+
+ assert(bus);
+ assert(k);
+ assert(k->payload_type == KDBUS_PAYLOAD_DBUS);
+
+ KDBUS_ITEM_FOREACH(d, k, items) {
+ size_t l;
+
+ l = d->size - offsetof(struct kdbus_item, data);
+
+ switch (d->type) {
+
+ case KDBUS_ITEM_PAYLOAD_OFF:
+ if (!header) {
+ header = (struct bus_header*)((uint8_t*) k + d->vec.offset);
+ header_size = d->vec.size;
+ }
+
+ footer = (uint8_t*) k + d->vec.offset;
+ footer_size = d->vec.size;
+
+ n_bytes += d->vec.size;
+ last_was_memfd = false;
+ break;
+
+ case KDBUS_ITEM_PAYLOAD_MEMFD:
+ if (!header) /* memfd cannot be first part */
+ return -EBADMSG;
+
+ n_bytes += d->memfd.size;
+ last_was_memfd = true;
+ break;
+
+ case KDBUS_ITEM_FDS: {
+ int *f;
+ unsigned j;
+
+ j = l / sizeof(int);
+ f = realloc(fds, sizeof(int) * (n_fds + j));
+ if (!f)
+ return -ENOMEM;
+
+ fds = f;
+ memcpy(fds + n_fds, d->fds, sizeof(int) * j);
+ n_fds += j;
+ break;
+ }
+
+ case KDBUS_ITEM_SECLABEL:
+ seclabel = d->str;
+ break;
+ }
+ }
+
+ if (last_was_memfd) /* memfd cannot be last part */
+ return -EBADMSG;
+
+ if (!header)
+ return -EBADMSG;
+
+ if (header_size < sizeof(struct bus_header))
+ return -EBADMSG;
+
+ /* on kdbus we only speak native endian gvariant, never dbus1
+ * marshalling or reverse endian */
+ if (header->version != 2 ||
+ header->endian != BUS_NATIVE_ENDIAN)
+ return -EPROTOTYPE;
+
+ r = bus_message_from_header(
+ bus,
+ header, header_size,
+ footer, footer_size,
+ n_bytes,
+ fds, n_fds,
+ seclabel, 0, &m);
+ if (r < 0)
+ return r;
+
+ /* The well-known names list is different from the other
+ credentials. If we asked for it, but nothing is there, this
+ means that the list of well-known names is simply empty, not
+ that we lack any data */
+
+ m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
+
+ KDBUS_ITEM_FOREACH(d, k, items) {
+ size_t l;
+
+ l = d->size - offsetof(struct kdbus_item, data);
+
+ switch (d->type) {
+
+ case KDBUS_ITEM_PAYLOAD_OFF: {
+ size_t begin_body;
+
+ begin_body = BUS_MESSAGE_BODY_BEGIN(m);
+
+ if (idx + d->vec.size > begin_body) {
+ struct bus_body_part *part;
+
+ /* Contains body material */
+
+ part = message_append_part(m);
+ if (!part) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ /* A -1 offset is NUL padding. */
+ part->is_zero = d->vec.offset == ~0ULL;
+
+ if (idx >= begin_body) {
+ if (!part->is_zero)
+ part->data = (uint8_t* )k + d->vec.offset;
+ part->size = d->vec.size;
+ } else {
+ if (!part->is_zero)
+ part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx);
+ part->size = d->vec.size - (begin_body - idx);
+ }
+
+ part->sealed = true;
+ }
+
+ idx += d->vec.size;
+ break;
+ }
+
+ case KDBUS_ITEM_PAYLOAD_MEMFD: {
+ struct bus_body_part *part;
+
+ if (idx < BUS_MESSAGE_BODY_BEGIN(m)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ part = message_append_part(m);
+ if (!part) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ part->memfd = d->memfd.fd;
+ part->memfd_offset = d->memfd.start;
+ part->size = d->memfd.size;
+ part->sealed = true;
+
+ idx += d->memfd.size;
+ break;
+ }
+
+ case KDBUS_ITEM_PIDS:
+
+ /* The PID/TID might be missing, when the data
+ * is faked by a bus proxy and it lacks that
+ * information about the real client (since
+ * SO_PEERCRED is used for that). Also kernel
+ * namespacing might make some of this data
+ * unavailable when untranslatable. */
+
+ if (d->pids.pid > 0) {
+ m->creds.pid = (pid_t) d->pids.pid;
+ m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask;
+ }
+
+ if (d->pids.tid > 0) {
+ m->creds.tid = (pid_t) d->pids.tid;
+ m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask;
+ }
+
+ if (d->pids.ppid > 0) {
+ m->creds.ppid = (pid_t) d->pids.ppid;
+ m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
+ } else if (d->pids.pid == 1) {
+ m->creds.ppid = 0;
+ m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask;
+ }
+
+ break;
+
+ case KDBUS_ITEM_CREDS:
+
+ /* EUID/SUID/FSUID/EGID/SGID/FSGID might be
+ * missing too (see above). */
+
+ if ((uid_t) d->creds.uid != UID_INVALID) {
+ m->creds.uid = (uid_t) d->creds.uid;
+ m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask;
+ }
+
+ if ((uid_t) d->creds.euid != UID_INVALID) {
+ m->creds.euid = (uid_t) d->creds.euid;
+ m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask;
+ }
+
+ if ((uid_t) d->creds.suid != UID_INVALID) {
+ m->creds.suid = (uid_t) d->creds.suid;
+ m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask;
+ }
+
+ if ((uid_t) d->creds.fsuid != UID_INVALID) {
+ m->creds.fsuid = (uid_t) d->creds.fsuid;
+ m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask;
+ }
+
+ if ((gid_t) d->creds.gid != GID_INVALID) {
+ m->creds.gid = (gid_t) d->creds.gid;
+ m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask;
+ }
+
+ if ((gid_t) d->creds.egid != GID_INVALID) {
+ m->creds.egid = (gid_t) d->creds.egid;
+ m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask;
+ }
+
+ if ((gid_t) d->creds.sgid != GID_INVALID) {
+ m->creds.sgid = (gid_t) d->creds.sgid;
+ m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask;
+ }
+
+ if ((gid_t) d->creds.fsgid != GID_INVALID) {
+ m->creds.fsgid = (gid_t) d->creds.fsgid;
+ m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask;
+ }
+
+ break;
+
+ case KDBUS_ITEM_TIMESTAMP:
+ message_set_timestamp(bus, m, &d->timestamp);
+ break;
+
+ case KDBUS_ITEM_PID_COMM:
+ m->creds.comm = d->str;
+ m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_TID_COMM:
+ m->creds.tid_comm = d->str;
+ m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_EXE:
+ m->creds.exe = d->str;
+ m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_CMDLINE:
+ m->creds.cmdline = d->str;
+ m->creds.cmdline_size = l;
+ m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_CGROUP:
+ m->creds.cgroup = d->str;
+ m->creds.mask |= (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) & bus->creds_mask;
+
+ r = bus_get_root_path(bus);
+ if (r < 0)
+ goto fail;
+
+ m->creds.cgroup_root = bus->cgroup_root;
+ break;
+
+ case KDBUS_ITEM_AUDIT:
+ m->creds.audit_session_id = (uint32_t) d->audit.sessionid;
+ m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask;
+
+ m->creds.audit_login_uid = (uid_t) d->audit.loginuid;
+ m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_CAPS:
+ if (d->caps.last_cap != cap_last_cap() ||
+ d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ m->creds.capability = d->caps.caps;
+ m->creds.mask |= (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS) & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_DST_NAME:
+ if (!service_name_is_valid(d->str)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ destination = d->str;
+ break;
+
+ case KDBUS_ITEM_OWNED_NAME:
+ if (!service_name_is_valid(d->name.name)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
+ char **wkn;
+ size_t n;
+
+ /* We just extend the array here, but
+ * do not allocate the strings inside
+ * of it, instead we just point to our
+ * buffer directly. */
+ n = strv_length(m->creds.well_known_names);
+ wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*));
+ if (!wkn) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ wkn[n] = d->name.name;
+ wkn[n+1] = NULL;
+ m->creds.well_known_names = wkn;
+
+ m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES;
+ }
+ break;
+
+ case KDBUS_ITEM_CONN_DESCRIPTION:
+ m->creds.description = d->str;
+ m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask;
+ break;
+
+ case KDBUS_ITEM_AUXGROUPS:
+
+ if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
+ size_t i, n;
+ gid_t *g;
+
+ n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t);
+ g = new(gid_t, n);
+ if (!g) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ for (i = 0; i < n; i++)
+ g[i] = d->data64[i];
+
+ m->creds.supplementary_gids = g;
+ m->creds.n_supplementary_gids = n;
+ m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS;
+ }
+
+ break;
+
+ case KDBUS_ITEM_FDS:
+ case KDBUS_ITEM_SECLABEL:
+ case KDBUS_ITEM_BLOOM_FILTER:
+ break;
+
+ default:
+ log_debug("Got unknown field from kernel %llu", d->type);
+ }
+ }
+
+ /* If we requested the list of well-known names to be appended
+ * and the sender had none no item for it will be
+ * attached. However, this does *not* mean that the kernel
+ * didn't want to provide this information to us. Hence, let's
+ * explicitly mark this information as available if it was
+ * requested. */
+ m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES;
+
+ r = bus_message_parse_fields(m);
+ if (r < 0)
+ goto fail;
+
+ /* Refuse messages if kdbus and dbus1 cookie doesn't match up */
+ if ((uint64_t) m->header->dbus2.cookie != k->cookie) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ /* Refuse messages where the reply flag doesn't match up */
+ if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ /* Refuse reply messages where the reply cookie doesn't match up */
+ if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ /* Refuse messages where the autostart flag doesn't match up */
+ if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ /* Override information from the user header with data from the kernel */
+ if (k->src_id == KDBUS_SRC_ID_KERNEL)
+ bus_message_set_sender_driver(bus, m);
+ else {
+ xsprintf(m->sender_buffer, ":1.%llu",
+ (unsigned long long)k->src_id);
+ m->sender = m->creds.unique_name = m->sender_buffer;
+ }
+
+ if (destination)
+ m->destination = destination;
+ else if (k->dst_id == KDBUS_DST_ID_BROADCAST)
+ m->destination = NULL;
+ else if (k->dst_id == KDBUS_DST_ID_NAME)
+ m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */
+ else {
+ xsprintf(m->destination_buffer, ":1.%llu",
+ (unsigned long long)k->dst_id);
+ m->destination = m->destination_buffer;
+ }
+
+ /* We take possession of the kmsg struct now */
+ m->kdbus = k;
+ m->release_kdbus = true;
+ m->free_fds = true;
+ fds = NULL;
+
+ bus->rqueue[bus->rqueue_size++] = m;
+
+ return 1;
+
+fail:
+ unset_memfds(m);
+ sd_bus_message_unref(m);
+
+ return r;
+}
+
+int bus_kernel_take_fd(sd_bus *b) {
+ struct kdbus_bloom_parameter *bloom = NULL;
+ struct kdbus_item *items, *item;
+ struct kdbus_cmd_hello *hello;
+ _cleanup_free_ char *g = NULL;
+ const char *name;
+ size_t l = 0, m = 0, sz;
+ int r;
+
+ assert(b);
+
+ if (b->is_server)
+ return -EINVAL;
+
+ b->use_memfd = 1;
+
+ if (b->description) {
+ g = bus_label_escape(b->description);
+ if (!g)
+ return -ENOMEM;
+
+ name = g;
+ } else {
+ char pr[17] = {};
+
+ /* If no name is explicitly set, we'll include a hint
+ * indicating the library implementation, a hint which
+ * kind of bus this is and the thread name */
+
+ assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0);
+
+ if (isempty(pr)) {
+ name = b->is_system ? "sd-system" :
+ b->is_user ? "sd-user" : "sd";
+ } else {
+ _cleanup_free_ char *e = NULL;
+
+ e = bus_label_escape(pr);
+ if (!e)
+ return -ENOMEM;
+
+ g = strappend(b->is_system ? "sd-system-" :
+ b->is_user ? "sd-user-" : "sd-",
+ e);
+ if (!g)
+ return -ENOMEM;
+
+ name = g;
+ }
+
+ b->description = bus_label_unescape(name);
+ if (!b->description)
+ return -ENOMEM;
+ }
+
+ m = strlen(name);
+
+ sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) +
+ ALIGN8(offsetof(struct kdbus_item, str) + m + 1);
+
+ if (b->fake_creds_valid)
+ sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds));
+
+ if (b->fake_pids_valid)
+ sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids));
+
+ if (b->fake_label) {
+ l = strlen(b->fake_label);
+ sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1);
+ }
+
+ hello = alloca0_align(sz, 8);
+ hello->size = sz;
+ hello->flags = b->hello_flags;
+ hello->attach_flags_send = _KDBUS_ATTACH_ANY;
+ hello->attach_flags_recv = b->attach_flags;
+ hello->pool_size = KDBUS_POOL_SIZE;
+
+ item = hello->items;
+
+ item->size = offsetof(struct kdbus_item, str) + m + 1;
+ item->type = KDBUS_ITEM_CONN_DESCRIPTION;
+ memcpy(item->str, name, m + 1);
+ item = KDBUS_ITEM_NEXT(item);
+
+ if (b->fake_creds_valid) {
+ item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds);
+ item->type = KDBUS_ITEM_CREDS;
+ item->creds = b->fake_creds;
+
+ item = KDBUS_ITEM_NEXT(item);
+ }
+
+ if (b->fake_pids_valid) {
+ item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids);
+ item->type = KDBUS_ITEM_PIDS;
+ item->pids = b->fake_pids;
+
+ item = KDBUS_ITEM_NEXT(item);
+ }
+
+ if (b->fake_label) {
+ item->size = offsetof(struct kdbus_item, str) + l + 1;
+ item->type = KDBUS_ITEM_SECLABEL;
+ memcpy(item->str, b->fake_label, l+1);
+ }
+
+ r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello);
+ if (r < 0) {
+ if (errno == ENOTTY)
+ /* If the ioctl is not supported we assume that the
+ * API version changed in a major incompatible way,
+ * let's indicate an API incompatibility in this
+ * case. */
+ return -ESOCKTNOSUPPORT;
+
+ return -errno;
+ }
+
+ if (!b->kdbus_buffer) {
+ b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0);
+ if (b->kdbus_buffer == MAP_FAILED) {
+ b->kdbus_buffer = NULL;
+ r = -errno;
+ goto fail;
+ }
+ }
+
+ /* The higher 32bit of the bus_flags fields are considered
+ * 'incompatible flags'. Refuse them all for now. */
+ if (hello->bus_flags > 0xFFFFFFFFULL) {
+ r = -ESOCKTNOSUPPORT;
+ goto fail;
+ }
+
+ /* extract bloom parameters from items */
+ items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset);
+ KDBUS_FOREACH(item, items, hello->items_size) {
+ switch (item->type) {
+ case KDBUS_ITEM_BLOOM_PARAMETER:
+ bloom = &item->bloom_parameter;
+ break;
+ }
+ }
+
+ if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) {
+ r = -EOPNOTSUPP;
+ goto fail;
+ }
+
+ b->bloom_size = (size_t) bloom->size;
+ b->bloom_n_hash = (unsigned) bloom->n_hash;
+
+ if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ b->unique_id = hello->id;
+
+ b->is_kernel = true;
+ b->bus_client = true;
+ b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD);
+ b->message_version = 2;
+ b->message_endian = BUS_NATIVE_ENDIAN;
+
+ /* the kernel told us the UUID of the underlying bus */
+ memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes));
+
+ /* free returned items */
+ (void) bus_kernel_cmd_free(b, hello->offset);
+ return bus_start_running(b);
+
+fail:
+ (void) bus_kernel_cmd_free(b, hello->offset);
+ return r;
+}
+
+int bus_kernel_connect(sd_bus *b) {
+ assert(b);
+ assert(b->input_fd < 0);
+ assert(b->output_fd < 0);
+ assert(b->kernel);
+
+ if (b->is_server)
+ return -EINVAL;
+
+ b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC);
+ if (b->input_fd < 0)
+ return -errno;
+
+ b->output_fd = b->input_fd;
+
+ return bus_kernel_take_fd(b);
+}
+
+int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
+ struct kdbus_cmd_free cmd = {
+ .size = sizeof(cmd),
+ .offset = offset,
+ };
+ int r;
+
+ assert(bus);
+ assert(bus->is_kernel);
+
+ r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
+ if (r < 0)
+ return -errno;
+
+ return 0;
+}
+
+static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) {
+ struct kdbus_item *d;
+
+ assert(bus);
+ assert(k);
+
+ KDBUS_ITEM_FOREACH(d, k, items) {
+ if (d->type == KDBUS_ITEM_FDS)
+ close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int));
+ else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD)
+ safe_close(d->memfd.fd);
+ }
+
+ bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer);
+}
+
+int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) {
+ struct kdbus_cmd_send cmd = { };
+ int r;
+
+ assert(bus);
+ assert(m);
+ assert(bus->state == BUS_RUNNING);
+
+ /* If we can't deliver, we want room for the error message */
+ r = bus_rqueue_make_room(bus);
+ if (r < 0)
+ return r;
+
+ r = bus_message_setup_kmsg(bus, m);
+ if (r < 0)
+ return r;
+
+ cmd.size = sizeof(cmd);
+ cmd.msg_address = (uintptr_t)m->kdbus;
+
+ /* If this is a synchronous method call, then let's tell the
+ * kernel, so that it can pass CPU time/scheduling to the
+ * destination for the time, if it wants to. If we
+ * synchronously wait for the result anyway, we won't need CPU
+ * anyway. */
+ if (hint_sync_call) {
+ m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY;
+ cmd.flags |= KDBUS_SEND_SYNC_REPLY;
+ }
+
+ r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd);
+ if (r < 0) {
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ sd_bus_message *reply;
+
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+ else if (errno == ENXIO || errno == ESRCH) {
+
+ /* ENXIO: unique name not known
+ * ESRCH: well-known name not known */
+
+ if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+ sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination);
+ else {
+ log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination);
+ return 0;
+ }
+
+ } else if (errno == EADDRNOTAVAIL) {
+
+ /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */
+
+ if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+ sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination);
+ else {
+ log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination);
+ return 0;
+ }
+ } else
+ return -errno;
+
+ r = bus_message_new_synthetic_error(
+ bus,
+ BUS_MESSAGE_COOKIE(m),
+ &error,
+ &reply);
+
+ if (r < 0)
+ return r;
+
+ r = bus_seal_synthetic_message(bus, reply);
+ if (r < 0)
+ return r;
+
+ bus->rqueue[bus->rqueue_size++] = reply;
+
+ } else if (hint_sync_call) {
+ struct kdbus_msg *k;
+
+ k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset);
+ assert(k);
+
+ if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
+
+ r = bus_kernel_make_message(bus, k);
+ if (r < 0) {
+ close_kdbus_msg(bus, k);
+
+ /* Anybody can send us invalid messages, let's just drop them. */
+ if (r == -EBADMSG || r == -EPROTOTYPE)
+ log_debug_errno(r, "Ignoring invalid synchronous reply: %m");
+ else
+ return r;
+ }
+ } else {
+ log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
+ close_kdbus_msg(bus, k);
+ }
+ }
+
+ return 1;
+}
+
+static int push_name_owner_changed(
+ sd_bus *bus,
+ const char *name,
+ const char *old_owner,
+ const char *new_owner,
+ const struct kdbus_timestamp *ts) {
+
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+ int r;
+
+ assert(bus);
+
+ r = sd_bus_message_new_signal(
+ bus,
+ &m,
+ "/org/freedesktop/DBus",
+ "org.freedesktop.DBus",
+ "NameOwnerChanged");
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(m, "sss", name, old_owner, new_owner);
+ if (r < 0)
+ return r;
+
+ bus_message_set_sender_driver(bus, m);
+ message_set_timestamp(bus, m, ts);
+
+ r = bus_seal_synthetic_message(bus, m);
+ if (r < 0)
+ return r;
+
+ bus->rqueue[bus->rqueue_size++] = m;
+ m = NULL;
+
+ return 1;
+}
+
+static int translate_name_change(
+ sd_bus *bus,
+ const struct kdbus_msg *k,
+ const struct kdbus_item *d,
+ const struct kdbus_timestamp *ts) {
+
+ char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX];
+
+ assert(bus);
+ assert(k);
+ assert(d);
+
+ if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR)))
+ old_owner[0] = 0;
+ else
+ sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id);
+
+ if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) {
+
+ if (isempty(old_owner))
+ return 0;
+
+ new_owner[0] = 0;
+ } else
+ sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id);
+
+ return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts);
+}
+
+static int translate_id_change(
+ sd_bus *bus,
+ const struct kdbus_msg *k,
+ const struct kdbus_item *d,
+ const struct kdbus_timestamp *ts) {
+
+ char owner[UNIQUE_NAME_MAX];
+
+ assert(bus);
+ assert(k);
+ assert(d);
+
+ sprintf(owner, ":1.%llu", d->id_change.id);
+
+ return push_name_owner_changed(
+ bus, owner,
+ d->type == KDBUS_ITEM_ID_ADD ? NULL : owner,
+ d->type == KDBUS_ITEM_ID_ADD ? owner : NULL,
+ ts);
+}
+
+static int translate_reply(
+ sd_bus *bus,
+ const struct kdbus_msg *k,
+ const struct kdbus_item *d,
+ const struct kdbus_timestamp *ts) {
+
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+ int r;
+
+ assert(bus);
+ assert(k);
+ assert(d);
+
+ r = bus_message_new_synthetic_error(
+ bus,
+ k->cookie_reply,
+ d->type == KDBUS_ITEM_REPLY_TIMEOUT ?
+ &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") :
+ &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"),
+ &m);
+ if (r < 0)
+ return r;
+
+ message_set_timestamp(bus, m, ts);
+
+ r = bus_seal_synthetic_message(bus, m);
+ if (r < 0)
+ return r;
+
+ bus->rqueue[bus->rqueue_size++] = m;
+ m = NULL;
+
+ return 1;
+}
+
+static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) {
+ static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = {
+ [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
+ [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
+ [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change,
+
+ [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
+ [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change,
+
+ [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
+ [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply,
+ };
+
+ struct kdbus_item *d, *found = NULL;
+ struct kdbus_timestamp *ts = NULL;
+
+ assert(bus);
+ assert(k);
+ assert(k->payload_type == KDBUS_PAYLOAD_KERNEL);
+
+ KDBUS_ITEM_FOREACH(d, k, items) {
+ if (d->type == KDBUS_ITEM_TIMESTAMP)
+ ts = &d->timestamp;
+ else if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) {
+ if (found)
+ return -EBADMSG;
+ found = d;
+ } else
+ log_debug("Got unknown field from kernel %llu", d->type);
+ }
+
+ if (!found) {
+ log_debug("Didn't find a kernel message to translate.");
+ return 0;
+ }
+
+ return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts);
+}
+
+int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) {
+ struct kdbus_cmd_recv recv = { .size = sizeof(recv) };
+ struct kdbus_msg *k;
+ int r;
+
+ assert(bus);
+
+ r = bus_rqueue_make_room(bus);
+ if (r < 0)
+ return r;
+
+ if (hint_priority) {
+ recv.flags |= KDBUS_RECV_USE_PRIORITY;
+ recv.priority = priority;
+ }
+
+ r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv);
+ if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS)
+ log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs);
+ if (r < 0) {
+ if (errno == EAGAIN)
+ return 0;
+
+ return -errno;
+ }
+
+ k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset);
+ if (k->payload_type == KDBUS_PAYLOAD_DBUS) {
+ r = bus_kernel_make_message(bus, k);
+
+ /* Anybody can send us invalid messages, let's just drop them. */
+ if (r == -EBADMSG || r == -EPROTOTYPE) {
+ log_debug_errno(r, "Ignoring invalid message: %m");
+ r = 0;
+ }
+
+ if (r <= 0)
+ close_kdbus_msg(bus, k);
+ } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) {
+ r = bus_kernel_translate_message(bus, k);
+ close_kdbus_msg(bus, k);
+ } else {
+ log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type);
+ r = 0;
+ close_kdbus_msg(bus, k);
+ }
+
+ return r < 0 ? r : 1;
+}
+
+int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) {
+ struct memfd_cache *c;
+ int fd;
+
+ assert(address);
+ assert(mapped);
+ assert(allocated);
+
+ if (!bus || !bus->is_kernel)
+ return -EOPNOTSUPP;
+
+ assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0);
+
+ if (bus->n_memfd_cache <= 0) {
+ int r;
+
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
+
+ r = memfd_new(bus->description);
+ if (r < 0)
+ return r;
+
+ *address = NULL;
+ *mapped = 0;
+ *allocated = 0;
+ return r;
+ }
+
+ c = &bus->memfd_cache[--bus->n_memfd_cache];
+
+ assert(c->fd >= 0);
+ assert(c->mapped == 0 || c->address);
+
+ *address = c->address;
+ *mapped = c->mapped;
+ *allocated = c->allocated;
+ fd = c->fd;
+
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
+
+ return fd;
+}
+
+static void close_and_munmap(int fd, void *address, size_t size) {
+ if (size > 0)
+ assert_se(munmap(address, PAGE_ALIGN(size)) >= 0);
+
+ safe_close(fd);
+}
+
+void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) {
+ struct memfd_cache *c;
+ uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX);
+
+ assert(fd >= 0);
+ assert(mapped == 0 || address);
+
+ if (!bus || !bus->is_kernel) {
+ close_and_munmap(fd, address, mapped);
+ return;
+ }
+
+ assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0);
+
+ if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) {
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
+
+ close_and_munmap(fd, address, mapped);
+ return;
+ }
+
+ c = &bus->memfd_cache[bus->n_memfd_cache++];
+ c->fd = fd;
+ c->address = address;
+
+ /* If overly long, let's return a bit to the OS */
+ if (mapped > max_mapped) {
+ assert_se(memfd_set_size(fd, max_mapped) >= 0);
+ assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0);
+ c->mapped = c->allocated = max_mapped;
+ } else {
+ c->mapped = mapped;
+ c->allocated = allocated;
+ }
+
+ assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0);
+}
+
+void bus_kernel_flush_memfd(sd_bus *b) {
+ unsigned i;
+
+ assert(b);
+
+ for (i = 0; i < b->n_memfd_cache; i++)
+ close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped);
+}
+
+uint64_t request_name_flags_to_kdbus(uint64_t flags) {
+ uint64_t f = 0;
+
+ if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT)
+ f |= KDBUS_NAME_ALLOW_REPLACEMENT;
+
+ if (flags & SD_BUS_NAME_REPLACE_EXISTING)
+ f |= KDBUS_NAME_REPLACE_EXISTING;
+
+ if (flags & SD_BUS_NAME_QUEUE)
+ f |= KDBUS_NAME_QUEUE;
+
+ return f;
+}
+
+uint64_t attach_flags_to_kdbus(uint64_t mask) {
+ uint64_t m = 0;
+
+ if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
+ SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID))
+ m |= KDBUS_ATTACH_CREDS;
+
+ if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID))
+ m |= KDBUS_ATTACH_PIDS;
+
+ if (mask & SD_BUS_CREDS_COMM)
+ m |= KDBUS_ATTACH_PID_COMM;
+
+ if (mask & SD_BUS_CREDS_TID_COMM)
+ m |= KDBUS_ATTACH_TID_COMM;
+
+ if (mask & SD_BUS_CREDS_EXE)
+ m |= KDBUS_ATTACH_EXE;
+
+ if (mask & SD_BUS_CREDS_CMDLINE)
+ m |= KDBUS_ATTACH_CMDLINE;
+
+ if (mask & (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))
+ m |= KDBUS_ATTACH_CGROUP;
+
+ if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS))
+ m |= KDBUS_ATTACH_CAPS;
+
+ if (mask & SD_BUS_CREDS_SELINUX_CONTEXT)
+ m |= KDBUS_ATTACH_SECLABEL;
+
+ if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID))
+ m |= KDBUS_ATTACH_AUDIT;
+
+ if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)
+ m |= KDBUS_ATTACH_NAMES;
+
+ if (mask & SD_BUS_CREDS_DESCRIPTION)
+ m |= KDBUS_ATTACH_CONN_DESCRIPTION;
+
+ if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)
+ m |= KDBUS_ATTACH_AUXGROUPS;
+
+ return m;
+}
+
+int bus_kernel_create_bus(const char *name, bool world, char **s) {
+ struct kdbus_cmd *make;
+ struct kdbus_item *n;
+ size_t l;
+ int fd;
+
+ assert(name);
+ assert(s);
+
+ fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ l = strlen(name);
+ make = alloca0_align(offsetof(struct kdbus_cmd, items) +
+ ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) +
+ ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) +
+ ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1),
+ 8);
+
+ make->size = offsetof(struct kdbus_cmd, items);
+
+ /* Set the bloom parameters */
+ n = make->items;
+ n->size = offsetof(struct kdbus_item, bloom_parameter) +
+ sizeof(struct kdbus_bloom_parameter);
+ n->type = KDBUS_ITEM_BLOOM_PARAMETER;
+ n->bloom_parameter.size = DEFAULT_BLOOM_SIZE;
+ n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH;
+
+ assert_cc(DEFAULT_BLOOM_SIZE > 0);
+ assert_cc(DEFAULT_BLOOM_N_HASH > 0);
+
+ make->size += ALIGN8(n->size);
+
+ /* Provide all metadata via bus-owner queries */
+ n = KDBUS_ITEM_NEXT(n);
+ n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND;
+ n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
+ n->data64[0] = _KDBUS_ATTACH_ANY;
+ make->size += ALIGN8(n->size);
+
+ /* Set the a good name */
+ n = KDBUS_ITEM_NEXT(n);
+ sprintf(n->str, UID_FMT "-%s", getuid(), name);
+ n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1;
+ n->type = KDBUS_ITEM_MAKE_NAME;
+ make->size += ALIGN8(n->size);
+
+ make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0;
+
+ if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) {
+ safe_close(fd);
+
+ /* Major API change? then the ioctls got shuffled around. */
+ if (errno == ENOTTY)
+ return -ESOCKTNOSUPPORT;
+
+ return -errno;
+ }
+
+ if (s) {
+ char *p;
+
+ p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL);
+ if (!p) {
+ safe_close(fd);
+ return -ENOMEM;
+ }
+
+ *s = p;
+ }
+
+ return fd;
+}
+
+int bus_kernel_open_bus_fd(const char *bus, char **path) {
+ char *p;
+ int fd;
+ size_t len;
+
+ assert(bus);
+
+ len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1;
+
+ if (path) {
+ p = new(char, len);
+ if (!p)
+ return -ENOMEM;
+ } else
+ p = newa(char, len);
+
+ sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus);
+
+ fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0) {
+ if (path)
+ free(p);
+
+ return -errno;
+ }
+
+ if (path)
+ *path = p;
+
+ return fd;
+}
+
+int bus_kernel_try_close(sd_bus *bus) {
+ struct kdbus_cmd byebye = { .size = sizeof(byebye) };
+
+ assert(bus);
+ assert(bus->is_kernel);
+
+ if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int bus_kernel_drop_one(int fd) {
+ struct kdbus_cmd_recv recv = {
+ .size = sizeof(recv),
+ .flags = KDBUS_RECV_DROP,
+ };
+
+ assert(fd >= 0);
+
+ if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int bus_kernel_realize_attach_flags(sd_bus *bus) {
+ struct kdbus_cmd *update;
+ struct kdbus_item *n;
+
+ assert(bus);
+ assert(bus->is_kernel);
+
+ update = alloca0_align(offsetof(struct kdbus_cmd, items) +
+ ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)),
+ 8);
+
+ n = update->items;
+ n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV;
+ n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t);
+ n->data64[0] = bus->attach_flags;
+
+ update->size =
+ offsetof(struct kdbus_cmd, items) +
+ ALIGN8(n->size);
+
+ if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int bus_kernel_get_bus_name(sd_bus *bus, char **name) {
+ struct kdbus_cmd_info cmd = {
+ .size = sizeof(struct kdbus_cmd_info),
+ };
+ struct kdbus_info *info;
+ struct kdbus_item *item;
+ char *n = NULL;
+ int r;
+
+ assert(bus);
+ assert(name);
+ assert(bus->is_kernel);
+
+ r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd);
+ if (r < 0)
+ return -errno;
+
+ info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset);
+
+ KDBUS_ITEM_FOREACH(item, info, items)
+ if (item->type == KDBUS_ITEM_MAKE_NAME) {
+ r = free_and_strdup(&n, item->str);
+ break;
+ }
+
+ bus_kernel_cmd_free(bus, cmd.offset);
+
+ if (r < 0)
+ return r;
+ if (!n)
+ return -EIO;
+
+ *name = n;
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 12:56:24 +0000