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-rw-r--r--src/libsystemd/sd-bus/DIFFERENCES7
-rw-r--r--src/libsystemd/sd-bus/GVARIANT-SERIALIZATION79
-rw-r--r--src/libsystemd/sd-bus/bus-gvariant.c60
-rw-r--r--src/libsystemd/sd-bus/bus-gvariant.h4
-rw-r--r--src/libsystemd/sd-bus/bus-kernel.c65
-rw-r--r--src/libsystemd/sd-bus/bus-message.c656
-rw-r--r--src/libsystemd/sd-bus/bus-message.h47
-rw-r--r--src/libsystemd/sd-bus/bus-protocol.h35
-rw-r--r--src/libsystemd/sd-bus/test-bus-gvariant.c24
9 files changed, 656 insertions, 321 deletions
diff --git a/src/libsystemd/sd-bus/DIFFERENCES b/src/libsystemd/sd-bus/DIFFERENCES
index fd7506b993..db269675a7 100644
--- a/src/libsystemd/sd-bus/DIFFERENCES
+++ b/src/libsystemd/sd-bus/DIFFERENCES
@@ -18,11 +18,8 @@ Known differences between dbus1 and kdbus:
- Serial numbers of synthesized messages are always (uint32_t) -1.
-- The org.freedesktop.DBus "driver" service is not special on
- kdbus. It is a bus activated service like any other with its own
- unique name.
-
- NameOwnerChanged is a synthetic message, generated locally and not
- by the driver.
+ by the driver. On dbus1 only the Disconnected message was
+ synthesized like this.
- There's no standard per-session bus anymore. Only a per-user bus.
diff --git a/src/libsystemd/sd-bus/GVARIANT-SERIALIZATION b/src/libsystemd/sd-bus/GVARIANT-SERIALIZATION
index 5dffc25bb3..859e2715f9 100644
--- a/src/libsystemd/sd-bus/GVARIANT-SERIALIZATION
+++ b/src/libsystemd/sd-bus/GVARIANT-SERIALIZATION
@@ -1,8 +1,9 @@
How we use GVariant for serializing D-Bus messages
--------------------------------------------------
-We stay as close to the original dbus1 framing as possible. dbus1 has
-the following framing:
+We stay close to the original dbus1 framing as possible, but make
+certain changes to adapt for GVariant. dbus1 has the following
+framing:
1. A fixed header of "yyyyuu"
2. Additional header fields of "a(yv)"
@@ -20,40 +21,86 @@ The header consists of the following:
y Flags
y Protocol version, '1'
u Length of the body, i.e. the length of part 4 above
- u Serial number
+ u 32bit Serial number
= 12 bytes
+This header is then followed by the the fields array, whose first
+value is a 32bit array size.
+
When using GVariant we keep the basic structure in place, only
-slightly extend the header, and define protocol version '2'. The new
+slightly alter the header, and define protocol version '2'. The new
header:
y Endianness, 'l' or 'B'
y Message Type
y Flags
y Protocol version, '2'
- u Length of the body, i.e. the length of part 4 above
- u Serial number
- u Length of the additional header fields array
+ u Reserved, must be 0
+ t 64bit Cookie
= 16 bytes
-This has the nice benefit that the beginning of the additional header
-fields array is aligned to an 8 byte boundary. Also, in dbus1
-marshalling arrays start with a length value of 32bit, which means in
-both dbus1 and gvariant marshallings the size of the header fields
-array will be at the same location between bytes 12 and 16. To
-visualize that:
+This is then followed by the GVariant fields array ("a{tv}"), and
+finally the actual body as variant (v). Putting this altogether a
+packet on dbus2 hence qualifies as a fully compliant GVariant
+structure of (yyyyuta{tv}v).
+
+For details on gvariant, see:
+
+https://people.gnome.org/~desrt/gvariant-serialisation.pdf
+
+Regarding the framing of dbus2, also see:
+
+https://wiki.gnome.org/Projects/GLib/GDBus/Version2
+
+The first four bytes of the header are defined the same way for dbus1
+and dbus2. The first bytes contain the endianess field and the
+protocol version, so that the remainder of the message can be safely
+made sense of just by looking at the first 32bit.
+
+Note that the length of the body is no longer included in the header
+on dbus2! In fact, the message size must be known in advance, from the
+underlying transport in order to parse dbus2 messages, while it is
+directly included in dbus1 message headers. This change of semantics
+is an effect of GVariant's basic design.
+
+The serial number has been renamed cookie and has been extended from
+32bit to 64bit. It is recommended to avoid the higher 32bit of the
+cookie field though, to simplify compatibility with dbus1 peers. Note
+that not only the cookie/serial field in the fixed header, but also
+the reply_cookie/reply_serial additional header field has been
+increased from 32bit to 64bit, too!
+
+The header field identifiers have been extended from 8bit to
+64bit. This has been done to simplify things (as kdbus otherwise uses
+exclusively 64bit types, unless there is a strong reason not to), and
+has no effect on the serialization size, as due to alignment for each
+8bit header field identifier 56 bits of padding had to be added.
+
+Note that the header size changed, due to these changes. However,
+consider that on dbus1 the beginning of the fields array contains the
+32bit array size (since that is how arrays are encoded on dbus1),
+thus, if one considers that size part of the header, instead of the
+array, the size of the header on dbus1 and dbus2 stays identical, at
+16 bytes.
0 4 8 12 16
- Common: | E | T | F | V | Body Length | Serial | Fields Length |
+ Common: | E | T | F | V | ...
- dbus1: | ... (as above) ... | Fields array ...
+ dbus1: | (as above) | Body Length | Serial | Fields Length | Fields array ...
- gvariant: | ... (as above) ... | Fields Length | Fields array ...
+ gvariant: | (as above) | Reserved | Cookie | Fields array ...
And that's already it.
+Note: to simplify parsing, valid kdbus/dbus2 messages must include the
+entire fixed header and additional header fields in a single non-memfd
+message part. Also, the signature string of the body variant all the
+way to the end of the message must be in a single non-memfd part
+too. The parts for this extended header and footer can be the same
+one, and can also continue any amount of additional body bytes.
+
Note: on kdbus only native endian messages marshalled in gvariant may
be sent. If a client receives a message in non-native endianness
or in dbus1 marshalling it shall ignore the message.
diff --git a/src/libsystemd/sd-bus/bus-gvariant.c b/src/libsystemd/sd-bus/bus-gvariant.c
index dc40009925..02b95cd136 100644
--- a/src/libsystemd/sd-bus/bus-gvariant.c
+++ b/src/libsystemd/sd-bus/bus-gvariant.c
@@ -247,3 +247,63 @@ int bus_gvariant_is_fixed_size(const char *signature) {
return true;
}
+
+size_t bus_gvariant_determine_word_size(size_t sz, size_t extra) {
+ if (sz + extra <= 0xFF)
+ return 1;
+ else if (sz + extra*2 <= 0xFFFF)
+ return 2;
+ else if (sz + extra*4 <= 0xFFFFFFFF)
+ return 4;
+ else
+ return 8;
+}
+
+size_t bus_gvariant_read_word_le(void *p, size_t sz) {
+ union {
+ uint16_t u16;
+ uint32_t u32;
+ uint64_t u64;
+ } x;
+
+ assert(p);
+
+ if (sz == 1)
+ return *(uint8_t*) p;
+
+ memcpy(&x, p, sz);
+
+ if (sz == 2)
+ return le16toh(x.u16);
+ else if (sz == 4)
+ return le32toh(x.u32);
+ else if (sz == 8)
+ return le64toh(x.u64);
+
+ assert_not_reached("unknown word width");
+}
+
+void bus_gvariant_write_word_le(void *p, size_t sz, size_t value) {
+ union {
+ uint16_t u16;
+ uint32_t u32;
+ uint64_t u64;
+ } x;
+
+ assert(p);
+ assert(sz == 8 || (value < (1ULL << (sz*8))));
+
+ if (sz == 1) {
+ *(uint8_t*) p = value;
+ return;
+ } else if (sz == 2)
+ x.u16 = htole16((uint16_t) value);
+ else if (sz == 4)
+ x.u32 = htole32((uint32_t) value);
+ else if (sz == 8)
+ x.u64 = htole64((uint64_t) value);
+ else
+ assert_not_reached("unknown word width");
+
+ memcpy(p, &x, sz);
+}
diff --git a/src/libsystemd/sd-bus/bus-gvariant.h b/src/libsystemd/sd-bus/bus-gvariant.h
index fdf533591b..875d34b59b 100644
--- a/src/libsystemd/sd-bus/bus-gvariant.h
+++ b/src/libsystemd/sd-bus/bus-gvariant.h
@@ -26,3 +26,7 @@
int bus_gvariant_get_size(const char *signature) _pure_;
int bus_gvariant_get_alignment(const char *signature) _pure_;
int bus_gvariant_is_fixed_size(const char *signature) _pure_;
+
+size_t bus_gvariant_determine_word_size(size_t sz, size_t extra);
+void bus_gvariant_write_word_le(void *p, size_t sz, size_t value);
+size_t bus_gvariant_read_word_le(void *p, size_t sz);
diff --git a/src/libsystemd/sd-bus/bus-kernel.c b/src/libsystemd/sd-bus/bus-kernel.c
index bdc770600b..f6ef868e72 100644
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -314,7 +314,7 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
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->cookie = m->header->dbus2.cookie;
m->kdbus->priority = m->priority;
if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
@@ -416,9 +416,12 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
struct kdbus_item *d;
unsigned n_fds = 0;
_cleanup_free_ int *fds = NULL;
- struct bus_header *h = NULL;
- size_t total, n_bytes = 0, idx = 0;
+ 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);
@@ -433,21 +436,24 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
switch (d->type) {
case KDBUS_ITEM_PAYLOAD_OFF:
- if (!h) {
- h = (struct bus_header *)((uint8_t *)k + d->vec.offset);
-
- if (!bus_header_is_complete(h, d->vec.size))
- return -EBADMSG;
+ 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 (!h)
+ if (!header) /* memfd cannot be first part */
return -EBADMSG;
n_bytes += d->memfd.size;
+ last_was_memfd = true;
break;
case KDBUS_ITEM_FDS: {
@@ -471,23 +477,29 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
}
}
- if (!h)
+ if (last_was_memfd) /* memfd cannot be last part */
return -EBADMSG;
- r = bus_header_message_size(h, &total);
- if (r < 0)
- return r;
+ if (!header)
+ return -EBADMSG;
- if (n_bytes != total)
+ if (header_size < sizeof(struct bus_header))
return -EBADMSG;
/* on kdbus we only speak native endian gvariant, never dbus1
* marshalling or reverse endian */
- if (h->version != 2 ||
- h->endian != BUS_NATIVE_ENDIAN)
+ if (header->version != 2 ||
+ header->endian != BUS_NATIVE_ENDIAN)
return -EPROTOTYPE;
- r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
+ r = bus_message_from_header(
+ bus,
+ header, header_size,
+ footer, footer_size,
+ n_bytes,
+ fds, n_fds,
+ NULL,
+ seclabel, 0, &m);
if (r < 0)
return r;
@@ -526,11 +538,11 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
if (idx >= begin_body) {
if (!part->is_zero)
- part->data = (uint8_t *)k + d->vec.offset;
+ 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->data = (uint8_t*) k + d->vec.offset + (begin_body - idx);
part->size = d->vec.size - (begin_body - idx);
}
@@ -567,10 +579,11 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
case KDBUS_ITEM_PIDS:
/* The PID/TID might be missing, when the data
- * is faked by some data bus proxy and it
- * lacks that information about the real
- * client since SO_PEERCRED is used for
- * that. */
+ * 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;
@@ -586,7 +599,8 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
case KDBUS_ITEM_CREDS:
- /* EUID/SUID/FSUID/EGID/SGID/FSGID might be missing too (see above). */
+ /* 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;
@@ -664,7 +678,6 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
goto fail;
m->creds.cgroup_root = bus->cgroup_root;
-
break;
case KDBUS_ITEM_AUDIT:
@@ -767,7 +780,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
goto fail;
/* Refuse messages if kdbus and dbus1 cookie doesn't match up */
- if ((uint64_t) m->header->serial != k->cookie) {
+ if ((uint64_t) m->header->dbus2.cookie != k->cookie) {
r = -EBADMSG;
goto fail;
}
diff --git a/src/libsystemd/sd-bus/bus-message.c b/src/libsystemd/sd-bus/bus-message.c
index da14a28c9a..447595764e 100644
--- a/src/libsystemd/sd-bus/bus-message.c
+++ b/src/libsystemd/sd-bus/bus-message.c
@@ -169,16 +169,17 @@ static void *message_extend_fields(sd_bus_message *m, size_t align, size_t sz, b
if (m->poisoned)
return NULL;
- old_size = sizeof(struct bus_header) + m->header->fields_size;
+ old_size = sizeof(struct bus_header) + m->fields_size;
start = ALIGN_TO(old_size, align);
new_size = start + sz;
+ if (new_size < start ||
+ new_size > (size_t) ((uint32_t) -1))
+ goto poison;
+
if (old_size == new_size)
return (uint8_t*) m->header + old_size;
- if (new_size > (size_t) ((uint32_t) -1))
- goto poison;
-
if (m->free_header) {
np = realloc(m->header, ALIGN8(new_size));
if (!np)
@@ -201,7 +202,7 @@ static void *message_extend_fields(sd_bus_message *m, size_t align, size_t sz, b
op = m->header;
m->header = np;
- m->header->fields_size = new_size - sizeof(struct bus_header);
+ m->fields_size = new_size - sizeof(struct bus_header);
/* Adjust quick access pointers */
m->path = adjust_pointer(m->path, op, old_size, m->header);
@@ -229,7 +230,7 @@ poison:
static int message_append_field_string(
sd_bus_message *m,
- uint8_t h,
+ uint64_t h,
char type,
const char *s,
const char **ret) {
@@ -239,6 +240,10 @@ static int message_append_field_string(
assert(m);
+ /* dbus1 only allows 8bit header field ids */
+ if (h > 0xFF)
+ return -EINVAL;
+
/* dbus1 doesn't allow strings over 32bit, let's enforce this
* globally, to not risk convertability */
l = strlen(s);
@@ -249,13 +254,12 @@ static int message_append_field_string(
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- /* (field id byte + 7x padding, ((string + NUL) + NUL + signature string 's') */
- p = message_extend_fields(m, 8, 1 + 7 + l + 1 + 1 + 1, true);
+ /* (field id 64bit, ((string + NUL) + NUL + signature string 's') */
+ p = message_extend_fields(m, 8, 8 + l + 1 + 1 + 1, true);
if (!p)
return -ENOMEM;
- p[0] = h;
- memzero(p+1, 7);
+ *((uint64_t*) p) = h;
memcpy(p+8, s, l);
p[8+l] = 0;
p[8+l+1] = 0;
@@ -270,7 +274,7 @@ static int message_append_field_string(
if (!p)
return -ENOMEM;
- p[0] = h;
+ p[0] = (uint8_t) h;
p[1] = 1;
p[2] = type;
p[3] = 0;
@@ -287,7 +291,7 @@ static int message_append_field_string(
static int message_append_field_signature(
sd_bus_message *m,
- uint8_t h,
+ uint64_t h,
const char *s,
const char **ret) {
@@ -296,7 +300,11 @@ static int message_append_field_signature(
assert(m);
- /* dbus1 doesn't allow signatures over 32bit, let's enforce
+ /* dbus1 only allows 8bit header field ids */
+ if (h > 0xFF)
+ return -EINVAL;
+
+ /* dbus1 doesn't allow signatures over 8bit, let's enforce
* this globally, to not risk convertability */
l = strlen(s);
if (l > 255)
@@ -313,7 +321,7 @@ static int message_append_field_signature(
if (!p)
return -ENOMEM;
- p[0] = h;
+ p[0] = (uint8_t) h;
p[1] = 1;
p[2] = SD_BUS_TYPE_SIGNATURE;
p[3] = 0;
@@ -327,20 +335,23 @@ static int message_append_field_signature(
return 0;
}
-static int message_append_field_uint32(sd_bus_message *m, uint8_t h, uint32_t x) {
+static int message_append_field_uint32(sd_bus_message *m, uint64_t h, uint32_t x) {
uint8_t *p;
assert(m);
+ /* dbus1 only allows 8bit header field ids */
+ if (h > 0xFF)
+ return -EINVAL;
+
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- /* (field id byte + 7x padding + ((value + NUL + signature string 'u') */
+ /* (field id 64bit + ((value + NUL + signature string 'u') */
- p = message_extend_fields(m, 8, 1 + 7 + 4 + 1 + 1, true);
+ p = message_extend_fields(m, 8, 8 + 4 + 1 + 1, true);
if (!p)
return -ENOMEM;
- p[0] = h;
- memzero(p+1, 7);
+ *((uint64_t*) p) = h;
*((uint32_t*) (p + 8)) = x;
p[12] = 0;
p[13] = 'u';
@@ -350,9 +361,9 @@ static int message_append_field_uint32(sd_bus_message *m, uint8_t h, uint32_t x)
if (!p)
return -ENOMEM;
- p[0] = h;
+ p[0] = (uint8_t) h;
p[1] = 1;
- p[2] = SD_BUS_TYPE_UINT32;
+ p[2] = 'u';
p[3] = 0;
((uint32_t*) p)[1] = x;
@@ -361,10 +372,54 @@ static int message_append_field_uint32(sd_bus_message *m, uint8_t h, uint32_t x)
return 0;
}
+static int message_append_field_uint64(sd_bus_message *m, uint64_t h, uint64_t x) {
+ uint8_t *p;
+
+ assert(m);
+
+ /* dbus1 only allows 8bit header field ids */
+ if (h > 0xFF)
+ return -EINVAL;
+
+ if (BUS_MESSAGE_IS_GVARIANT(m)) {
+ /* (field id 64bit + ((value + NUL + signature string 't') */
+
+ p = message_extend_fields(m, 8, 8 + 8 + 1 + 1, true);
+ if (!p)
+ return -ENOMEM;
+
+ *((uint64_t*) p) = h;
+ *((uint64_t*) (p + 8)) = x;
+ p[16] = 0;
+ p[17] = 't';
+ } else {
+ /* (field id byte + (signature length + signature 't' + NUL) + 4 byte padding + value) */
+ p = message_extend_fields(m, 8, 4 + 4 + 8, false);
+ if (!p)
+ return -ENOMEM;
+
+ p[0] = (uint8_t) h;
+ p[1] = 1;
+ p[2] = 't';
+ p[3] = 0;
+ p[4] = 0;
+ p[5] = 0;
+ p[6] = 0;
+ p[7] = 0;
+
+ ((uint64_t*) p)[1] = x;
+ }
+
+ return 0;
+}
+
int bus_message_from_header(
sd_bus *bus,
- void *buffer,
- size_t length,
+ void *header,
+ size_t header_accessible,
+ void *footer,
+ size_t footer_accessible,
+ size_t message_size,
int *fds,
unsigned n_fds,
const struct ucred *ucred,
@@ -377,19 +432,22 @@ int bus_message_from_header(
size_t a, label_sz;
assert(bus);
- assert(buffer || length <= 0);
+ assert(header || header_accessible <= 0);
+ assert(footer || footer_accessible <= 0);
assert(fds || n_fds <= 0);
assert(ret);
- if (length < sizeof(struct bus_header))
+ if (header_accessible < sizeof(struct bus_header))
return -EBADMSG;
- h = buffer;
- if (h->version != 1 &&
- h->version != 2)
+ if (header_accessible > message_size)
+ return -EBADMSG;
+ if (footer_accessible > message_size)
return -EBADMSG;
- if (h->serial == 0)
+ h = header;
+ if (h->version != 1 &&
+ h->version != 2)
return -EBADMSG;
if (h->type == _SD_BUS_MESSAGE_TYPE_INVALID)
@@ -399,6 +457,8 @@ int bus_message_from_header(
h->endian != BUS_BIG_ENDIAN)
return -EBADMSG;
+ /* Note that we are happy with unknown flags in the flags header! */
+
a = ALIGN(sizeof(sd_bus_message)) + ALIGN(extra);
if (label) {
@@ -412,7 +472,48 @@ int bus_message_from_header(
m->n_ref = 1;
m->sealed = true;
- m->header = h;
+ m->header = header;
+ m->header_accessible = header_accessible;
+ m->footer = footer;
+ m->footer_accessible = footer_accessible;
+
+ if (BUS_MESSAGE_IS_GVARIANT(m)) {
+ size_t ws;
+
+ if (h->dbus2.cookie == 0)
+ return -EBADMSG;
+
+ /* dbus2 derives the sizes from the message size and
+ the offset table at the end, since it is formatted as
+ gvariant "yyyyuta{tv}v". Since the message itself is a
+ structure with precisely to variable sized entries,
+ there's only one offset in the table, which marks the
+ end of the fields array. */
+
+ ws = bus_gvariant_determine_word_size(message_size, 0);
+ if (footer_accessible < ws)
+ return -EBADMSG;
+
+ m->fields_size = bus_gvariant_read_word_le((uint8_t*) footer + footer_accessible - ws, ws);
+ if (ALIGN8(m->fields_size) > message_size - ws)
+ return -EBADMSG;
+ if (m->fields_size < sizeof(struct bus_header))
+ return -EBADMSG;
+
+ m->fields_size -= sizeof(struct bus_header);
+ m->body_size = message_size - (sizeof(struct bus_header) + ALIGN8(m->fields_size));
+ } else {
+ if (h->dbus1.serial == 0)
+ return -EBADMSG;
+
+ /* dbus1 has the sizes in the header */
+ m->fields_size = BUS_MESSAGE_BSWAP32(m, h->dbus1.fields_size);
+ m->body_size = BUS_MESSAGE_BSWAP32(m, h->dbus1.body_size);
+
+ if (sizeof(struct bus_header) + ALIGN8(m->fields_size) + m->body_size != message_size)
+ return -EBADMSG;
+ }
+
m->fds = fds;
m->n_fds = n_fds;
@@ -460,19 +561,21 @@ int bus_message_from_malloc(
size_t sz;
int r;
- r = bus_message_from_header(bus, buffer, length, fds, n_fds, ucred, label, 0, &m);
+ r = bus_message_from_header(
+ bus,
+ buffer, length, /* in this case the initial bytes and the final bytes are the same */
+ buffer, length,
+ length,
+ fds, n_fds,
+ ucred, label,
+ 0, &m);
if (r < 0)
return r;
- if (length != BUS_MESSAGE_SIZE(m)) {
- r = -EBADMSG;
- goto fail;
- }
-
- sz = length - sizeof(struct bus_header) - ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
+ sz = length - sizeof(struct bus_header) - ALIGN8(m->fields_size);
if (sz > 0) {
m->n_body_parts = 1;
- m->body.data = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
+ m->body.data = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN8(m->fields_size);
m->body.size = sz;
m->body.sealed = true;
m->body.memfd = -1;
@@ -631,8 +734,17 @@ static int message_new_reply(
t->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
t->reply_cookie = BUS_MESSAGE_COOKIE(call);
+ if (t->reply_cookie == 0)
+ return -ENOTSUP;
- r = message_append_field_uint32(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, (uint32_t) t->reply_cookie);
+ if (BUS_MESSAGE_IS_GVARIANT(t))
+ r = message_append_field_uint64(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_cookie);
+ else {
+ if (t->reply_cookie > 0xffffffff)
+ return -ENOTSUP;
+
+ r = message_append_field_uint32(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, (uint32_t) t->reply_cookie);
+ }
if (r < 0)
goto fail;
@@ -851,9 +963,14 @@ _public_ int sd_bus_message_get_type(sd_bus_message *m, uint8_t *type) {
}
_public_ int sd_bus_message_get_cookie(sd_bus_message *m, uint64_t *cookie) {
+ uint64_t c;
+
assert_return(m, -EINVAL);
assert_return(cookie, -EINVAL);
- assert_return(m->header->serial != 0, -ENODATA);
+
+ c = BUS_MESSAGE_COOKIE(m);
+ if (c == 0)
+ return -ENODATA;
*cookie = BUS_MESSAGE_COOKIE(m);
return 0;
@@ -862,7 +979,9 @@ _public_ int sd_bus_message_get_cookie(sd_bus_message *m, uint64_t *cookie) {
_public_ int sd_bus_message_get_reply_cookie(sd_bus_message *m, uint64_t *cookie) {
assert_return(m, -EINVAL);
assert_return(cookie, -EINVAL);
- assert_return(m->reply_cookie != 0, -ENODATA);
+
+ if (m->reply_cookie == 0)
+ return -ENODATA;
*cookie = m->reply_cookie;
return 0;
@@ -967,9 +1086,11 @@ _public_ sd_bus_creds *sd_bus_message_get_creds(sd_bus_message *m) {
return &m->creds;
}
-_public_ int sd_bus_message_is_signal(sd_bus_message *m,
- const char *interface,
- const char *member) {
+_public_ int sd_bus_message_is_signal(
+ sd_bus_message *m,
+ const char *interface,
+ const char *member) {
+
assert_return(m, -EINVAL);
if (m->header->type != SD_BUS_MESSAGE_SIGNAL)
@@ -984,9 +1105,11 @@ _public_ int sd_bus_message_is_signal(sd_bus_message *m,
return 1;
}
-_public_ int sd_bus_message_is_method_call(sd_bus_message *m,
- const char *interface,
- const char *member) {
+_public_ int sd_bus_message_is_method_call(
+ sd_bus_message *m,
+ const char *interface,
+ const char *member) {
+
assert_return(m, -EINVAL);
if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
@@ -1221,7 +1344,13 @@ static void message_extend_containers(sd_bus_message *m, size_t expand) {
}
}
-static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz, bool add_offset) {
+static void *message_extend_body(
+ sd_bus_message *m,
+ size_t align,
+ size_t sz,
+ bool add_offset,
+ bool force_inline) {
+
size_t start_body, end_body, padding, added;
void *p;
int r;
@@ -1233,14 +1362,15 @@ static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz, boo
if (m->poisoned)
return NULL;
- start_body = ALIGN_TO((size_t) m->header->body_size, align);
+ start_body = ALIGN_TO((size_t) m->body_size, align);
end_body = start_body + sz;
- padding = start_body - m->header->body_size;
+ padding = start_body - m->body_size;
added = padding + sz;
/* Check for 32bit overflows */
- if (end_body > (size_t) ((uint32_t) -1)) {
+ if (end_body > (size_t) ((uint32_t) -1) ||
+ end_body < start_body) {
m->poisoned = true;
return NULL;
}
@@ -1252,7 +1382,8 @@ static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz, boo
add_new_part =
m->n_body_parts <= 0 ||
m->body_end->sealed ||
- padding != ALIGN_TO(m->body_end->size, align) - m->body_end->size;
+ (padding != ALIGN_TO(m->body_end->size, align) - m->body_end->size) ||
+ (force_inline && m->body_end->size > MEMFD_MIN_SIZE); /* if this must be an inlined extension, let's create a new part if the previous part is large enough to be inlined */
if (add_new_part) {
if (padding > 0) {
@@ -1301,7 +1432,7 @@ static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz, boo
/* Return something that is not NULL and is aligned */
p = (uint8_t *) NULL + align;
- m->header->body_size = end_body;
+ m->body_size = end_body;
message_extend_containers(m, added);
if (add_offset) {
@@ -1427,7 +1558,7 @@ int message_append_basic(sd_bus_message *m, char type, const void *p, const void
assert(align > 0);
assert(sz > 0);
- a = message_extend_body(m, align, sz, true);
+ a = message_extend_body(m, align, sz, true, false);
if (!a)
return -ENOMEM;
@@ -1496,7 +1627,7 @@ int message_append_basic(sd_bus_message *m, char type, const void *p, const void
assert(align > 0);
assert(sz > 0);
- a = message_extend_body(m, align, sz, false);
+ a = message_extend_body(m, align, sz, false, false);
if (!a)
return -ENOMEM;
@@ -1570,13 +1701,13 @@ _public_ int sd_bus_message_append_string_space(
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- a = message_extend_body(m, 1, size + 1, true);
+ a = message_extend_body(m, 1, size + 1, true, false);
if (!a)
return -ENOMEM;
*s = a;
} else {
- a = message_extend_body(m, 4, 4 + size + 1, false);
+ a = message_extend_body(m, 4, 4 + size + 1, false, false);
if (!a)
return -ENOMEM;
@@ -1681,14 +1812,14 @@ static int bus_message_open_array(
return alignment;
/* Add alignment padding and add to offset list */
- if (!message_extend_body(m, alignment, 0, false))
+ if (!message_extend_body(m, alignment, 0, false, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
- *begin = m->header->body_size;
+ *begin = m->body_size;
*need_offsets = r == 0;
} else {
void *a, *op;
@@ -1699,7 +1830,7 @@ static int bus_message_open_array(
if (alignment < 0)
return alignment;
- a = message_extend_body(m, 4, 4, false);
+ a = message_extend_body(m, 4, 4, false, false);
if (!a)
return -ENOMEM;
@@ -1708,7 +1839,7 @@ static int bus_message_open_array(
os = m->body_end->size;
/* Add alignment between size and first element */
- if (!message_extend_body(m, alignment, 0, false))
+ if (!message_extend_body(m, alignment, 0, false, false))
return -ENOMEM;
/* location of array size might have changed so let's readjust a */
@@ -1761,7 +1892,7 @@ static int bus_message_open_variant(
if (BUS_MESSAGE_IS_GVARIANT(m)) {
/* Variants are always aligned to 8 */
- if (!message_extend_body(m, 8, 0, false))
+ if (!message_extend_body(m, 8, 0, false, false))
return -ENOMEM;
} else {
@@ -1769,7 +1900,7 @@ static int bus_message_open_variant(
void *a;
l = strlen(contents);
- a = message_extend_body(m, 1, 1 + l + 1, false);
+ a = message_extend_body(m, 1, 1 + l + 1, false, false);
if (!a)
return -ENOMEM;
@@ -1835,18 +1966,18 @@ static int bus_message_open_struct(
if (alignment < 0)
return alignment;
- if (!message_extend_body(m, alignment, 0, false))
+ if (!message_extend_body(m, alignment, 0, false, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
- *begin = m->header->body_size;
+ *begin = m->body_size;
*need_offsets = r == 0;
} else {
/* Align contents to 8 byte boundary */
- if (!message_extend_body(m, 8, 0, false))
+ if (!message_extend_body(m, 8, 0, false, false))
return -ENOMEM;
}
@@ -1896,18 +2027,18 @@ static int bus_message_open_dict_entry(
if (alignment < 0)
return alignment;
- if (!message_extend_body(m, alignment, 0, false))
+ if (!message_extend_body(m, alignment, 0, false, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
- *begin = m->header->body_size;
+ *begin = m->body_size;
*need_offsets = r == 0;
} else {
/* Align contents to 8 byte boundary */
- if (!message_extend_body(m, 8, 0, false))
+ if (!message_extend_body(m, 8, 0, false, false))
return -ENOMEM;
}
@@ -1948,7 +2079,7 @@ _public_ int sd_bus_message_open_container(
/* Save old index in the parent container, in case we have to
* abort this container */
c->saved_index = c->index;
- before = m->header->body_size;
+ before = m->body_size;
if (type == SD_BUS_TYPE_ARRAY)
r = bus_message_open_array(m, c, contents, &array_size, &begin, &need_offsets);
@@ -1981,66 +2112,6 @@ _public_ int sd_bus_message_open_container(
return 0;
}
-static size_t determine_word_size(size_t sz, size_t extra) {
- if (sz + extra <= 0xFF)
- return 1;
- else if (sz + extra*2 <= 0xFFFF)
- return 2;
- else if (sz + extra*4 <= 0xFFFFFFFF)
- return 4;
- else
- return 8;
-}
-
-static size_t read_word_le(void *p, size_t sz) {
- union {
- uint16_t u16;
- uint32_t u32;
- uint64_t u64;
- } x;
-
- assert(p);
-
- if (sz == 1)
- return *(uint8_t*) p;
-
- memcpy(&x, p, sz);
-
- if (sz == 2)
- return le16toh(x.u16);
- else if (sz == 4)
- return le32toh(x.u32);
- else if (sz == 8)
- return le64toh(x.u64);
-
- assert_not_reached("unknown word width");
-}
-
-static void write_word_le(void *p, size_t sz, size_t value) {
- union {
- uint16_t u16;
- uint32_t u32;
- uint64_t u64;
- } x;
-
- assert(p);
- assert(sz == 8 || (value < (1ULL << (sz*8))));
-
- if (sz == 1) {
- *(uint8_t*) p = value;
- return;
- } else if (sz == 2)
- x.u16 = htole16((uint16_t) value);
- else if (sz == 4)
- x.u32 = htole32((uint32_t) value);
- else if (sz == 8)
- x.u64 = htole64((uint64_t) value);
- else
- assert_not_reached("unknown word width");
-
- memcpy(p, &x, sz);
-}
-
static int bus_message_close_array(sd_bus_message *m, struct bus_container *c) {
assert(m);
@@ -2056,20 +2127,20 @@ static int bus_message_close_array(sd_bus_message *m, struct bus_container *c) {
/* Variable-width arrays */
payload = c->n_offsets > 0 ? c->offsets[c->n_offsets-1] - c->begin : 0;
- sz = determine_word_size(payload, c->n_offsets);
+ sz = bus_gvariant_determine_word_size(payload, c->n_offsets);
- a = message_extend_body(m, 1, sz * c->n_offsets, true);
+ a = message_extend_body(m, 1, sz * c->n_offsets, true, false);
if (!a)
return -ENOMEM;
for (i = 0; i < c->n_offsets; i++)
- write_word_le(a + sz*i, sz, c->offsets[i] - c->begin);
+ bus_gvariant_write_word_le(a + sz*i, sz, c->offsets[i] - c->begin);
} else {
void *a;
/* Fixed-width or empty arrays */
- a = message_extend_body(m, 1, 0, true); /* let's add offset to parent */
+ a = message_extend_body(m, 1, 0, true, false); /* let's add offset to parent */
if (!a)
return -ENOMEM;
}
@@ -2090,7 +2161,7 @@ static int bus_message_close_variant(sd_bus_message *m, struct bus_container *c)
l = strlen(c->signature);
- a = message_extend_body(m, 1, 1 + l, true);
+ a = message_extend_body(m, 1, 1 + l, true, false);
if (!a)
return -ENOMEM;
@@ -2147,18 +2218,18 @@ static int bus_message_close_struct(sd_bus_message *m, struct bus_container *c,
assert(c->need_offsets || n_variable == 0);
if (n_variable <= 0) {
- a = message_extend_body(m, 1, 0, add_offset);
+ a = message_extend_body(m, 1, 0, add_offset, false);
if (!a)
return -ENOMEM;
} else {
size_t sz;
unsigned j;
- assert(c->offsets[c->n_offsets-1] == m->header->body_size);
+ assert(c->offsets[c->n_offsets-1] == m->body_size);
- sz = determine_word_size(m->header->body_size - c->begin, n_variable);
+ sz = bus_gvariant_determine_word_size(m->body_size - c->begin, n_variable);
- a = message_extend_body(m, 1, sz * n_variable, add_offset);
+ a = message_extend_body(m, 1, sz * n_variable, add_offset, false);
if (!a)
return -ENOMEM;
@@ -2187,7 +2258,7 @@ static int bus_message_close_struct(sd_bus_message *m, struct bus_container *c,
k = n_variable - 1 - j;
- write_word_le(a + k * sz, sz, c->offsets[i] - c->begin);
+ bus_gvariant_write_word_le(a + k * sz, sz, c->offsets[i] - c->begin);
j++;
}
@@ -2518,7 +2589,7 @@ _public_ int sd_bus_message_append_array_space(
if (r < 0)
return r;
- a = message_extend_body(m, align, size, false);
+ a = message_extend_body(m, align, size, false, false);
if (!a)
return -ENOMEM;
@@ -2647,7 +2718,7 @@ _public_ int sd_bus_message_append_array_memfd(
if (r < 0)
return r;
- a = message_extend_body(m, align, 0, false);
+ a = message_extend_body(m, align, 0, false, false);
if (!a)
return -ENOMEM;
@@ -2661,7 +2732,7 @@ _public_ int sd_bus_message_append_array_memfd(
part->size = size;
copy_fd = -1;
- m->header->body_size += size;
+ m->body_size += size;
message_extend_containers(m, size);
return sd_bus_message_close_container(m);
@@ -2731,7 +2802,7 @@ _public_ int sd_bus_message_append_string_memfd(
}
if (!BUS_MESSAGE_IS_GVARIANT(m)) {
- a = message_extend_body(m, 4, 4, false);
+ a = message_extend_body(m, 4, 4, false, false);
if (!a)
return -ENOMEM;
@@ -2748,11 +2819,11 @@ _public_ int sd_bus_message_append_string_memfd(
part->size = size;
copy_fd = -1;
- m->header->body_size += size;
+ m->body_size += size;
message_extend_containers(m, size);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- r = message_add_offset(m, m->header->body_size);
+ r = message_add_offset(m, m->body_size);
if (r < 0) {
m->poisoned = true;
return -ENOMEM;
@@ -2787,34 +2858,66 @@ _public_ int sd_bus_message_append_strv(sd_bus_message *m, char **l) {
}
static int bus_message_close_header(sd_bus_message *m) {
- uint8_t *a;
- size_t sz, i;
assert(m);
- if (!BUS_MESSAGE_IS_GVARIANT(m))
- return 0;
+ /* The actual user data is finished now, we just complete the
+ variant and struct now (at least on gvariant). Remember
+ this position, so that during parsing we know where to to
+ put the outer container end. */
+ m->user_body_size = m->body_size;
- if (m->n_header_offsets < 1)
- return 0;
+ if (BUS_MESSAGE_IS_GVARIANT(m)) {
+ const char *signature;
+ size_t sz, l;
+ void *d;
- assert(m->header->fields_size == m->header_offsets[m->n_header_offsets-1]);
+ /* Add offset table to end of fields array */
+ if (m->n_header_offsets >= 1) {
+ uint8_t *a;
+ unsigned i;
- sz = determine_word_size(m->header->fields_size, m->n_header_offsets);
+ assert(m->fields_size == m->header_offsets[m->n_header_offsets-1]);
- a = message_extend_fields(m, 1, sz * m->n_header_offsets, false);
- if (!a)
- return -ENOMEM;
+ sz = bus_gvariant_determine_word_size(m->fields_size, m->n_header_offsets);
+ a = message_extend_fields(m, 1, sz * m->n_header_offsets, false);
+ if (!a)
+ return -ENOMEM;
+
+ for (i = 0; i < m->n_header_offsets; i++)
+ bus_gvariant_write_word_le(a + sz*i, sz, m->header_offsets[i]);
+ }
+
+ /* Add gvariant NUL byte plus signature to the end of
+ * the body, followed by the final offset pointing to
+ * the end of the fields array */
- for (i = 0; i < m->n_header_offsets; i++)
- write_word_le(a + sz*i, sz, m->header_offsets[i]);
+ signature = strempty(m->root_container.signature);
+ l = strlen(signature);
+
+ sz = bus_gvariant_determine_word_size(sizeof(struct bus_header) + ALIGN8(m->fields_size) + m->body_size + 1 + l, 1);
+ d = message_extend_body(m, 1, 1 + l + sz, false, true);
+ if (!d)
+ return -ENOMEM;
+
+ *(uint8_t*) d = 0;
+ memcpy((uint8_t*) d + 1, signature, l);
+
+ bus_gvariant_write_word_le((uint8_t*) d + 1 + l, sz, sizeof(struct bus_header) + m->fields_size);
+
+ m->footer = d;
+ m->footer_accessible = 1 + l + sz;
+ } else {
+ m->header->dbus1.fields_size = m->fields_size;
+ m->header->dbus1.body_size = m->body_size;
+ }
return 0;
}
int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
struct bus_body_part *part;
- size_t l, a;
+ size_t a;
unsigned i;
int r;
@@ -2829,6 +2932,10 @@ int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
if (m->poisoned)
return -ESTALE;
+ if (cookie > 0xffffffffULL &&
+ !BUS_MESSAGE_IS_GVARIANT(m))
+ return -ENOTSUP;
+
/* In vtables the return signature of method calls is listed,
* let's check if they match if this is a response */
if (m->header->type == SD_BUS_MESSAGE_METHOD_RETURN &&
@@ -2841,8 +2948,9 @@ int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
if (r < 0)
return r;
- /* If there's a non-trivial signature set, then add it in here */
- if (!isempty(m->root_container.signature)) {
+ /* If there's a non-trivial signature set, then add it in
+ * here, but only on dbus1 */
+ if (!isempty(m->root_container.signature) && !BUS_MESSAGE_IS_GVARIANT(m)) {
r = message_append_field_signature(m, BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
if (r < 0)
return r;
@@ -2858,24 +2966,30 @@ int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
if (r < 0)
return r;
- m->header->serial = (uint32_t) cookie;
+ if (BUS_MESSAGE_IS_GVARIANT(m))
+ m->header->dbus2.cookie = cookie;
+ else
+ m->header->dbus1.serial = (uint32_t) cookie;
+
m->timeout = m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED ? 0 : timeout;
/* Add padding at the end of the fields part, since we know
* the body needs to start at an 8 byte alignment. We made
* sure we allocated enough space for this, so all we need to
* do here is to zero it out. */
- l = BUS_MESSAGE_FIELDS_SIZE(m);
- a = ALIGN8(l) - l;
+ a = ALIGN8(m->fields_size) - m->fields_size;
if (a > 0)
- memzero((uint8_t*) BUS_MESSAGE_FIELDS(m) + l, a);
+ memzero((uint8_t*) BUS_MESSAGE_FIELDS(m) + m->fields_size, a);
/* If this is something we can send as memfd, then let's seal
the memfd now. Note that we can send memfds as payload only
for directed messages, and not for broadcasts. */
if (m->destination && m->bus->use_memfd) {
MESSAGE_FOREACH_PART(part, i, m)
- if (part->memfd >= 0 && !part->sealed && (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0)) {
+ if (part->memfd >= 0 &&
+ !part->sealed &&
+ (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0) &&
+ part != m->body_end) { /* The last part may never be sent as memfd */
uint64_t sz;
/* Try to seal it if that makes
@@ -2895,7 +3009,7 @@ int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
}
}
- m->root_container.end = BUS_MESSAGE_BODY_SIZE(m);
+ m->root_container.end = m->user_body_size;
m->root_container.index = 0;
m->root_container.offset_index = 0;
m->root_container.item_size = m->root_container.n_offsets > 0 ? m->root_container.offsets[0] : 0;
@@ -3181,7 +3295,7 @@ static int message_peek_body(
padding = start - *rindex;
end = start + nbytes;
- if (end > BUS_MESSAGE_BODY_SIZE(m))
+ if (end > m->user_body_size)
return -EBADMSG;
part = find_part(m, *rindex, padding, (void**) &q);
@@ -3554,14 +3668,14 @@ static int bus_message_enter_array(
unsigned i;
/* gvariant: variable length array */
- sz = determine_word_size(c->item_size, 0);
+ sz = bus_gvariant_determine_word_size(c->item_size, 0);
where = rindex + c->item_size - sz;
r = message_peek_body(m, &where, 1, sz, &q);
if (r < 0)
return r;
- framing = read_word_le(q, sz);
+ framing = bus_gvariant_read_word_le(q, sz);
if (framing > c->item_size - sz)
return -EBADMSG;
if ((c->item_size - framing) % sz != 0)
@@ -3581,7 +3695,7 @@ static int bus_message_enter_array(
for (i = 0; i < *n_offsets; i++) {
size_t x;
- x = read_word_le((uint8_t*) q + i * sz, sz);
+ x = bus_gvariant_read_word_le((uint8_t*) q + i * sz, sz);
if (x > c->item_size - sz)
return -EBADMSG;
if (x < p)
@@ -3704,7 +3818,7 @@ static int build_struct_offsets(
return 0;
}
- sz = determine_word_size(size, 0);
+ sz = bus_gvariant_determine_word_size(size, 0);
if (sz <= 0)
return -EBADMSG;
@@ -3778,7 +3892,7 @@ static int build_struct_offsets(
if (v > 0) {
v--;
- x = read_word_le((uint8_t*) q + v*sz, sz);
+ x = bus_gvariant_read_word_le((uint8_t*) q + v*sz, sz);
if (x >= size)
return -EBADMSG;
if (m->rindex + x < previous)
@@ -4659,10 +4773,12 @@ _public_ int sd_bus_message_skip(sd_bus_message *m, const char *types) {
}
}
-_public_ int sd_bus_message_read_array(sd_bus_message *m,
- char type,
- const void **ptr,
- size_t *size) {
+_public_ int sd_bus_message_read_array(
+ sd_bus_message *m,
+ char type,
+ const void **ptr,
+ size_t *size) {
+
struct bus_container *c;
void *p;
size_t sz;
@@ -4731,7 +4847,7 @@ static int message_peek_fields(
assert(rindex);
assert(align > 0);
- return buffer_peek(BUS_MESSAGE_FIELDS(m), BUS_MESSAGE_FIELDS_SIZE(m), rindex, align, nbytes, ret);
+ return buffer_peek(BUS_MESSAGE_FIELDS(m), m->fields_size, rindex, align, nbytes, ret);
}
static int message_peek_field_uint32(
@@ -4761,6 +4877,33 @@ static int message_peek_field_uint32(
return 0;
}
+static int message_peek_field_uint64(
+ sd_bus_message *m,
+ size_t *ri,
+ size_t item_size,
+ uint64_t *ret) {
+
+ int r;
+ void *q;
+
+ assert(m);
+ assert(ri);
+
+ if (BUS_MESSAGE_IS_GVARIANT(m) && item_size != 8)
+ return -EBADMSG;
+
+ /* identical for gvariant and dbus1 */
+
+ r = message_peek_fields(m, ri, 8, 8, &q);
+ if (r < 0)
+ return r;
+
+ if (ret)
+ *ret = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
+
+ return 0;
+}
+
static int message_peek_field_string(
sd_bus_message *m,
bool (*validate)(const char *p),
@@ -5006,59 +5149,106 @@ int bus_message_parse_fields(sd_bus_message *m) {
assert(m);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- void *q;
+ char *p;
+
+ /* Read the signature from the end of the body variant first */
+ sz = bus_gvariant_determine_word_size(BUS_MESSAGE_SIZE(m), 0);
+ if (m->footer_accessible < 1 + sz)
+ return -EBADMSG;
+
+ p = (char*) m->footer + m->footer_accessible - (1 + sz);
+ for (;;) {
+ if (p < (char*) m->footer)
+ return -EBADMSG;
+
+ if (*p == 0) {
+ char *c;
+
+ /* We found the beginning of the signature string, yay! */
+
+ c = strndup(p + 1, ((char*) m->footer + m->footer_accessible) - p - (1 + sz));
+ if (!c)
+ return -ENOMEM;
+
+ free(m->root_container.signature);
+ m->root_container.signature = c;
+ break;
+ }
- sz = determine_word_size(BUS_MESSAGE_FIELDS_SIZE(m), 0);
+ p--;
+ }
+
+ /* Calculate the actual user body size, by removing
+ * the trailing variant signature and struct offset
+ * table */
+ m->user_body_size = m->body_size - ((char*) m->footer + m->footer_accessible - p);
+
+ /* Pull out the offset table for the fields array */
+ sz = bus_gvariant_determine_word_size(m->fields_size, 0);
if (sz > 0) {
size_t framing;
+ void *q;
- ri = BUS_MESSAGE_FIELDS_SIZE(m) - sz;
+ ri = m->fields_size - sz;
r = message_peek_fields(m, &ri, 1, sz, &q);
if (r < 0)
return r;
- framing = read_word_le(q, sz);
- if (framing >= BUS_MESSAGE_FIELDS_SIZE(m) - sz)
+ framing = bus_gvariant_read_word_le(q, sz);
+ if (framing >= m->fields_size - sz)
return -EBADMSG;
- if ((BUS_MESSAGE_FIELDS_SIZE(m) - framing) % sz != 0)
+ if ((m->fields_size - framing) % sz != 0)
return -EBADMSG;
ri = framing;
- r = message_peek_fields(m, &ri, 1, BUS_MESSAGE_FIELDS_SIZE(m) - framing, &offsets);
+ r = message_peek_fields(m, &ri, 1, m->fields_size - framing, &offsets);
if (r < 0)
return r;
- n_offsets = (BUS_MESSAGE_FIELDS_SIZE(m) - framing) / sz;
+ n_offsets = (m->fields_size - framing) / sz;
}
- }
+ } else
+ m->user_body_size = m->body_size;
ri = 0;
- while (ri < BUS_MESSAGE_FIELDS_SIZE(m)) {
+ while (ri < m->fields_size) {
_cleanup_free_ char *sig = NULL;
const char *signature;
- uint8_t *header;
+ uint64_t field_type;
size_t item_size = (size_t) -1;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
+ uint64_t *u64;
+
if (i >= n_offsets)
break;
if (i == 0)
ri = 0;
else
- ri = ALIGN_TO(read_word_le((uint8_t*) offsets + (i-1)*sz, sz), 8);
- }
+ ri = ALIGN_TO(bus_gvariant_read_word_le((uint8_t*) offsets + (i-1)*sz, sz), 8);
- r = message_peek_fields(m, &ri, 8, 1, (void**) &header);
- if (r < 0)
- return r;
+ r = message_peek_fields(m, &ri, 8, 8, (void**) &u64);
+ if (r < 0)
+ return r;
+
+ field_type = BUS_MESSAGE_BSWAP64(m, *u64);
+ } else {
+ uint8_t *u8;
+
+ r = message_peek_fields(m, &ri, 8, 1, (void**) &u8);
+ if (r < 0)
+ return r;
+
+ field_type = *u8;
+ }
if (BUS_MESSAGE_IS_GVARIANT(m)) {
size_t where, end;
char *b;
void *q;
- end = read_word_le((uint8_t*) offsets + i*sz, sz);
+ end = bus_gvariant_read_word_le((uint8_t*) offsets + i*sz, sz);
if (end < ri)
return -EBADMSG;
@@ -5085,7 +5275,8 @@ int bus_message_parse_fields(sd_bus_message *m) {
return r;
}
- switch (*header) {
+ switch (field_type) {
+
case _BUS_MESSAGE_HEADER_INVALID:
return -EBADMSG;
@@ -5169,6 +5360,9 @@ int bus_message_parse_fields(sd_bus_message *m) {
const char *s;
char *c;
+ if (BUS_MESSAGE_IS_GVARIANT(m)) /* only applies to dbus1 */
+ return -EBADMSG;
+
if (m->root_container.signature)
return -EBADMSG;
@@ -5188,26 +5382,38 @@ int bus_message_parse_fields(sd_bus_message *m) {
break;
}
- case BUS_MESSAGE_HEADER_REPLY_SERIAL: {
- uint32_t serial;
+ case BUS_MESSAGE_HEADER_REPLY_SERIAL:
if (m->reply_cookie != 0)
return -EBADMSG;
- if (!streq(signature, "u"))
- return -EBADMSG;
+ if (BUS_MESSAGE_IS_GVARIANT(m)) {
+ /* 64bit on dbus2 */
- r = message_peek_field_uint32(m, &ri, item_size, &serial);
- if (r < 0)
- return r;
+ if (!streq(signature, "t"))
+ return -EBADMSG;
+
+ r = message_peek_field_uint64(m, &ri, item_size, &m->reply_cookie);
+ if (r < 0)
+ return r;
+ } else {
+ /* 32bit on dbus1 */
+ uint32_t serial;
+
+ if (!streq(signature, "u"))
+ return -EBADMSG;
- m->reply_cookie = serial;
+ r = message_peek_field_uint32(m, &ri, item_size, &serial);
+ if (r < 0)
+ return r;
+
+ m->reply_cookie = serial;
+ }
if (m->reply_cookie == 0)
return -EBADMSG;
break;
- }
case BUS_MESSAGE_HEADER_UNIX_FDS:
if (unix_fds_set)
@@ -5279,13 +5485,13 @@ int bus_message_parse_fields(sd_bus_message *m) {
if (streq_ptr(m->sender, "org.freedesktop.DBus.Local"))
return -EBADMSG;
- m->root_container.end = BUS_MESSAGE_BODY_SIZE(m);
+ m->root_container.end = m->user_body_size;
if (BUS_MESSAGE_IS_GVARIANT(m)) {
r = build_struct_offsets(
m,
m->root_container.signature,
- BUS_MESSAGE_BODY_SIZE(m),
+ m->user_body_size,
&m->root_container.item_size,
&m->root_container.offsets,
&m->root_container.n_offsets);
@@ -5439,40 +5645,6 @@ int bus_message_get_arg(sd_bus_message *m, unsigned i, const char **str, char **
return 0;
}
-bool bus_header_is_complete(struct bus_header *h, size_t size) {
- size_t full;
-
- assert(h);
- assert(size);
-
- if (size < sizeof(struct bus_header))
- return false;
-
- full = sizeof(struct bus_header) +
- (h->endian == BUS_NATIVE_ENDIAN ? h->fields_size : bswap_32(h->fields_size));
-
- return size >= full;
-}
-
-int bus_header_message_size(struct bus_header *h, size_t *sum) {
- size_t fs, bs;
-
- assert(h);
- assert(sum);
-
- if (h->endian == BUS_NATIVE_ENDIAN) {
- fs = h->fields_size;
- bs = h->body_size;
- } else if (h->endian == BUS_REVERSE_ENDIAN) {
- fs = bswap_32(h->fields_size);
- bs = bswap_32(h->body_size);
- } else
- return -EBADMSG;
-
- *sum = sizeof(struct bus_header) + ALIGN8(fs) + bs;
- return 0;
-}
-
_public_ int sd_bus_message_get_errno(sd_bus_message *m) {
assert_return(m, EINVAL);
diff --git a/src/libsystemd/sd-bus/bus-message.h b/src/libsystemd/sd-bus/bus-message.h
index b4cdce7bf4..32955329b4 100644
--- a/src/libsystemd/sd-bus/bus-message.h
+++ b/src/libsystemd/sd-bus/bus-message.h
@@ -99,7 +99,18 @@ struct sd_bus_message {
bool release_kdbus:1;
bool poisoned:1;
+ /* The first and last bytes of the message */
struct bus_header *header;
+ void *footer;
+
+ /* How many bytes are accessible in the above pointers */
+ size_t header_accessible;
+ size_t footer_accessible;
+
+ size_t fields_size;
+ size_t body_size;
+ size_t user_body_size;
+
struct bus_body_part body;
struct bus_body_part *body_end;
unsigned n_body_parts;
@@ -112,7 +123,7 @@ struct sd_bus_message {
int *fds;
struct bus_container root_container, *containers;
- unsigned n_containers;
+ size_t n_containers;
size_t containers_allocated;
struct iovec *iovec;
@@ -138,7 +149,9 @@ struct sd_bus_message {
unsigned n_header_offsets;
};
-#define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != BUS_NATIVE_ENDIAN)
+static inline bool BUS_MESSAGE_NEED_BSWAP(sd_bus_message *m) {
+ return m->header->endian != BUS_NATIVE_ENDIAN;
+}
static inline uint16_t BUS_MESSAGE_BSWAP16(sd_bus_message *m, uint16_t u) {
return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_16(u) : u;
@@ -153,29 +166,23 @@ static inline uint64_t BUS_MESSAGE_BSWAP64(sd_bus_message *m, uint64_t u) {
}
static inline uint64_t BUS_MESSAGE_COOKIE(sd_bus_message *m) {
- /* Note that we return the serial converted to a 64bit value here */
- return BUS_MESSAGE_BSWAP32(m, m->header->serial);
-}
+ if (m->header->version == 2)
+ return BUS_MESSAGE_BSWAP64(m, m->header->dbus2.cookie);
-static inline uint32_t BUS_MESSAGE_BODY_SIZE(sd_bus_message *m) {
- return BUS_MESSAGE_BSWAP32(m, m->header->body_size);
+ return BUS_MESSAGE_BSWAP32(m, m->header->dbus1.serial);
}
-static inline uint32_t BUS_MESSAGE_FIELDS_SIZE(sd_bus_message *m) {
- return BUS_MESSAGE_BSWAP32(m, m->header->fields_size);
-}
-
-static inline uint32_t BUS_MESSAGE_SIZE(sd_bus_message *m) {
+static inline size_t BUS_MESSAGE_SIZE(sd_bus_message *m) {
return
sizeof(struct bus_header) +
- ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) +
- BUS_MESSAGE_BODY_SIZE(m);
+ ALIGN8(m->fields_size) +
+ m->body_size;
}
-static inline uint32_t BUS_MESSAGE_BODY_BEGIN(sd_bus_message *m) {
+static inline size_t BUS_MESSAGE_BODY_BEGIN(sd_bus_message *m) {
return
sizeof(struct bus_header) +
- ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
+ ALIGN8(m->fields_size);
}
static inline void* BUS_MESSAGE_FIELDS(sd_bus_message *m) {
@@ -193,7 +200,10 @@ int bus_message_read_strv_extend(sd_bus_message *m, char ***l);
int bus_message_from_header(
sd_bus *bus,
void *header,
- size_t length,
+ size_t header_accessible,
+ void *footer,
+ size_t footer_accessible,
+ size_t message_size,
int *fds,
unsigned n_fds,
const struct ucred *ucred,
@@ -217,9 +227,6 @@ int bus_message_append_ap(sd_bus_message *m, const char *types, va_list ap);
int bus_message_parse_fields(sd_bus_message *m);
-bool bus_header_is_complete(struct bus_header *h, size_t size);
-int bus_header_message_size(struct bus_header *h, size_t *sum);
-
struct bus_body_part *message_append_part(sd_bus_message *m);
#define MESSAGE_FOREACH_PART(part, i, m) \
diff --git a/src/libsystemd/sd-bus/bus-protocol.h b/src/libsystemd/sd-bus/bus-protocol.h
index 6431dfbff8..183af89a63 100644
--- a/src/libsystemd/sd-bus/bus-protocol.h
+++ b/src/libsystemd/sd-bus/bus-protocol.h
@@ -23,21 +23,38 @@
#include <endian.h>
+#include "macro.h"
+
/* Packet header */
-struct bus_header {
+struct _packed_ bus_header {
+ /* The first four fields are identical for dbus1, and dbus2 */
uint8_t endian;
uint8_t type;
uint8_t flags;
uint8_t version;
- uint32_t body_size;
-
- /* Note that what the bus spec calls "serial" we'll call
- "cookie" instead, because we don't want to imply that the
- cookie was in any way monotonically increasing. */
- uint32_t serial;
- uint32_t fields_size;
-} _packed_;
+
+ union _packed_ {
+ /* dbus1: Used for SOCK_STREAM connections */
+ struct _packed_ {
+ uint32_t body_size;
+
+ /* Note that what the bus spec calls "serial" we'll call
+ "cookie" instead, because we don't want to imply that the
+ cookie was in any way monotonically increasing. */
+ uint32_t serial;
+ uint32_t fields_size;
+ } dbus1;
+
+ /* dbus2: Used for kdbus connections */
+ struct _packed_ {
+ uint32_t _reserved;
+ uint64_t cookie;
+ } dbus2;
+
+ /* Note that both header versions have the same size! */
+ };
+};
/* Endianness */
diff --git a/src/libsystemd/sd-bus/test-bus-gvariant.c b/src/libsystemd/sd-bus/test-bus-gvariant.c
index 6992ec44de..992edacb28 100644
--- a/src/libsystemd/sd-bus/test-bus-gvariant.c
+++ b/src/libsystemd/sd-bus/test-bus-gvariant.c
@@ -132,7 +132,7 @@ static void test_bus_gvariant_get_alignment(void) {
static void test_marshal(void) {
_cleanup_bus_message_unref_ sd_bus_message *m = NULL, *n = NULL;
- _cleanup_bus_unref_ sd_bus *bus = NULL;
+ _cleanup_bus_close_unref_ sd_bus *bus = NULL;
_cleanup_free_ void *blob;
size_t sz;
int r;
@@ -145,6 +145,8 @@ static void test_marshal(void) {
assert_se(sd_bus_message_new_method_call(bus, &m, "a.service.name", "/an/object/path/which/is/really/really/long/so/that/we/hit/the/eight/bit/boundary/by/quite/some/margin/to/test/this/stuff/that/it/really/works", "an.interface.name", "AMethodName") >= 0);
+ assert_cc(sizeof(struct bus_header) == 16);
+
assert_se(sd_bus_message_append(m,
"a(usv)", 3,
4711, "first-string-parameter", "(st)", "X", (uint64_t) 1111,
@@ -162,13 +164,15 @@ static void test_marshal(void) {
g_type_init();
#endif
- v = g_variant_new_from_data(G_VARIANT_TYPE("(yyyyuuua(yv))"), m->header, sizeof(struct bus_header) + BUS_MESSAGE_FIELDS_SIZE(m), false, NULL, NULL);
+ v = g_variant_new_from_data(G_VARIANT_TYPE("(yyyyuta{tv})"), m->header, sizeof(struct bus_header) + m->fields_size, false, NULL, NULL);
+ assert_se(g_variant_is_normal_form(v));
t = g_variant_print(v, TRUE);
printf("%s\n", t);
g_free(t);
g_variant_unref(v);
- v = g_variant_new_from_data(G_VARIANT_TYPE("(a(usv))"), m->body.data, BUS_MESSAGE_BODY_SIZE(m), false, NULL, NULL);
+ v = g_variant_new_from_data(G_VARIANT_TYPE("(a(usv))"), m->body.data, m->user_body_size, false, NULL, NULL);
+ assert_se(g_variant_is_normal_form(v));
t = g_variant_print(v, TRUE);
printf("%s\n", t);
g_free(t);
@@ -180,6 +184,20 @@ static void test_marshal(void) {
assert_se(bus_message_get_blob(m, &blob, &sz) >= 0);
+#ifdef HAVE_GLIB
+ {
+ GVariant *v;
+ char *t;
+
+ v = g_variant_new_from_data(G_VARIANT_TYPE("(yyyyuta{tv}v)"), blob, sz, false, NULL, NULL);
+ assert_se(g_variant_is_normal_form(v));
+ t = g_variant_print(v, TRUE);
+ printf("%s\n", t);
+ g_free(t);
+ g_variant_unref(v);
+ }
+#endif
+
assert_se(bus_message_from_malloc(bus, blob, sz, NULL, 0, NULL, NULL, &n) >= 0);
blob = NULL;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-08 14:36:42 +0000