#include "util.h"
#include "strv.h"
#include "memfd-util.h"
+#include "cgroup-util.h"
+#include "fileio.h"
#include "bus-internal.h"
#include "bus-message.h"
#include "bus-bloom.h"
#include "bus-util.h"
#include "bus-label.h"
-#include "cgroup-util.h"
#define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t))
*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 int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) {
void *data;
unsigned i;
return r;
for (i = 0; i < 64; i++) {
+ const char *t, *contents;
char type;
- const char *t;
- char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
- char *e;
- r = sd_bus_message_peek_type(m, &type, NULL);
+ r = sd_bus_message_peek_type(m, &type, &contents);
if (r < 0)
return r;
- if (type != SD_BUS_TYPE_STRING &&
- type != SD_BUS_TYPE_OBJECT_PATH &&
- type != SD_BUS_TYPE_SIGNATURE)
- break;
+ if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) {
- r = sd_bus_message_read_basic(m, type, &t);
- if (r < 0)
- return r;
+ /* The bloom filter includes simple strings of any kind */
+ r = sd_bus_message_read_basic(m, type, &t);
+ if (r < 0)
+ return r;
- e = stpcpy(buf, "arg");
- if (i < 10)
- *(e++) = '0' + (char) i;
- else {
- *(e++) = '0' + (char) (i / 10);
- *(e++) = '0' + (char) (i % 10);
- }
+ 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;
- *e = 0;
- bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t);
+ while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0)
+ add_bloom_arg(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;
- strcpy(e, "-dot-prefix");
- bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '.');
- strcpy(e, "-slash-prefix");
- bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '/');
+ } else
+ /* Stop adding to bloom filter as soon as we
+ * run into the first argument we cannot add
+ * to it. */
+ break;
}
return 0;
((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
- if (well_known) {
+ if (well_known)
/* 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 weel-known-name, and fail if they
* differ. Currently, this is only needed for bus-proxyd. */
m->kdbus->dst_id = m->verify_destination_id;
- } else {
+ else
m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST;
- }
m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS;
m->kdbus->cookie = (uint64_t) m->header->serial;
m->kdbus->priority = m->priority;
- if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) {
+ if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
m->kdbus->cookie_reply = m->reply_cookie;
- } else {
+ else {
struct timespec now;
assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0);
return r;
}
+static void bus_message_set_sender_driver(sd_bus *bus, sd_bus_message *m) {
+ assert(bus);
+ assert(m);
+
+ m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
+ m->creds.well_known_names_driver = true;
+ m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask;
+}
+
static void unset_memfds(struct sd_bus_message *m) {
struct bus_body_part *part;
unsigned i;
}
if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
- r = strv_extend(&m->creds.well_known_names, d->name.name);
- if (r < 0)
+ 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;
}
}
}
+ /* 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 we 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->serial != 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_FLAGS_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_FLAGS_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)
- m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus";
+ bus_message_set_sender_driver(bus, m);
else {
snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id);
m->sender = m->creds.unique_name = m->sender_buffer;
return bus_kernel_take_fd(b);
}
+int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) {
+ struct kdbus_cmd_free cmd = {
+ .flags = 0,
+ .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_cmd_free cmd = {};
struct kdbus_item *d;
assert(bus);
assert(k);
- cmd.offset = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer;
-
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);
}
- (void) ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd);
+ 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) {
/* Anybody can send us invalid messages, let's just drop them. */
if (r == -EBADMSG || r == -EPROTOTYPE)
- log_debug("Ignoring invalid message: %s", strerror(-r));
+ log_debug_errno(r, "Ignoring invalid message: %m");
else
return r;
}
if (r < 0)
return r;
- m->sender = "org.freedesktop.DBus";
+ bus_message_set_sender_driver(bus, m);
r = bus_seal_synthetic_message(bus, m);
if (r < 0)
if (r < 0)
return r;
- m->sender = "org.freedesktop.DBus";
+ bus_message_set_sender_driver(bus, m);
r = bus_seal_synthetic_message(bus, m);
if (r < 0)
/* Anybody can send us invalid messages, let's just drop them. */
if (r == -EBADMSG || r == -EPROTOTYPE) {
- log_debug("Ignoring invalid message: %s", strerror(-r));
+ log_debug_errno(r, "Ignoring invalid message: %m");
r = 0;
}
return 0;
}
+
+int bus_kernel_fix_attach_mask(void) {
+ _cleanup_free_ char *mask = NULL;
+ uint64_t m = (uint64_t) -1;
+ char buf[2+16+2];
+ int r;
+
+ /* By default we don't want any kdbus metadata fields to be
+ * suppressed, hence we reset the kernel mask for it to
+ * (uint64_t) -1. This is overridable via a kernel command
+ * line option, however. */
+
+ r = get_proc_cmdline_key("systemd.kdbus_attach_flags_mask=", &mask);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to read kernel command line: %m");
+
+ if (mask) {
+ const char *p = mask;
+
+ if (startswith(p, "0x"))
+ p += 2;
+
+ if (sscanf(p, "%" PRIx64, &m) != 1)
+ log_warning("Couldn't parse systemd.kdbus_attach_flags_mask= kernel command line parameter.");
+ }
+
+ sprintf(buf, "0x%" PRIx64 "\n", m);
+ r = write_string_file("/sys/module/kdbus/parameters/attach_flags_mask", buf);
+ if (r < 0)
+ return log_full_errno(
+ r == -EROFS ? LOG_DEBUG : LOG_WARNING, r,
+ "Failed to write kdbus attach mask: %m");
+
+ 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;
+}
~ianmdlvl / elogind.git / blobdiff