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authorKay Sievers <kay@vrfy.org>2015-01-30 13:53:45 +0100
committerKay Sievers <kay@vrfy.org>2015-01-30 13:53:45 +0100
commit954871d8ba15911d014f76ed2c7a9492953cf39d (patch)
tree7ee5e5cfccf8f3ed9feedd1c0f86481a408253c9
parent82c28f5621ad80585eb6c232a988af955a07060c (diff)
Revert "sd-bus: change serialization of kdbus messages to qualify in their entirety as gvariant objects"
This breaks booting with kdbus. This reverts commit b381de4197157748ed96e469fcc372c23f842ae1.
Diffstat
-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.h6
-rw-r--r--src/libsystemd/sd-bus/bus-kernel.c61
-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, 319 insertions, 656 deletions
diff --git a/src/libsystemd/sd-bus/DIFFERENCES b/src/libsystemd/sd-bus/DIFFERENCES
index db269675a7..fd7506b993 100644
--- a/src/libsystemd/sd-bus/DIFFERENCES
+++ b/src/libsystemd/sd-bus/DIFFERENCES
@@ -18,8 +18,11 @@ 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. On dbus1 only the Disconnected message was
- synthesized like this.
+ by the driver.
- 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 859e2715f9..5dffc25bb3 100644
--- a/src/libsystemd/sd-bus/GVARIANT-SERIALIZATION
+++ b/src/libsystemd/sd-bus/GVARIANT-SERIALIZATION
@@ -1,9 +1,8 @@
How we use GVariant for serializing D-Bus messages
--------------------------------------------------
-We stay close to the original dbus1 framing as possible, but make
-certain changes to adapt for GVariant. dbus1 has the following
-framing:
+We stay as close to the original dbus1 framing as possible. dbus1 has
+the following framing:
1. A fixed header of "yyyyuu"
2. Additional header fields of "a(yv)"
@@ -21,86 +20,40 @@ 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 32bit Serial number
+ u 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 alter the header, and define protocol version '2'. The new
+slightly extend 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 Reserved, must be 0
- t 64bit Cookie
+ u Length of the body, i.e. the length of part 4 above
+ u Serial number
+ u Length of the additional header fields array
= 16 bytes
-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.
+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:
0 4 8 12 16
- Common: | E | T | F | V | ...
+ Common: | E | T | F | V | Body Length | Serial | Fields Length |
- dbus1: | (as above) | Body Length | Serial | Fields Length | Fields array ...
+ dbus1: | ... (as above) ... | Fields array ...
- gvariant: | (as above) | Reserved | Cookie | Fields array ...
+ gvariant: | ... (as above) ... | Fields Length | 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 02b95cd136..dc40009925 100644
--- a/src/libsystemd/sd-bus/bus-gvariant.c
+++ b/src/libsystemd/sd-bus/bus-gvariant.c
@@ -247,63 +247,3 @@ 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 875d34b59b..b4bd2a50f0 100644
--- a/src/libsystemd/sd-bus/bus-gvariant.h
+++ b/src/libsystemd/sd-bus/bus-gvariant.h
@@ -21,12 +21,6 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include "macro.h"
-
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 be64a12ea2..b4d0af102f 100644
--- a/src/libsystemd/sd-bus/bus-kernel.c
+++ b/src/libsystemd/sd-bus/bus-kernel.c
@@ -309,7 +309,7 @@ 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 = m->header->dbus2.cookie;
+ m->kdbus->cookie = (uint64_t) m->header->serial;
m->kdbus->priority = m->priority;
if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
@@ -411,12 +411,9 @@ 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 *header = NULL;
- void *footer = NULL;
- size_t header_size = 0, footer_size = 0;
- size_t n_bytes = 0, idx = 0;
+ struct bus_header *h = NULL;
+ size_t total, n_bytes = 0, idx = 0;
const char *destination = NULL, *seclabel = NULL;
- bool last_was_memfd = false;
int r;
assert(bus);
@@ -431,24 +428,21 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
switch (d->type) {
case KDBUS_ITEM_PAYLOAD_OFF:
- if (!header) {
- header = (struct bus_header *)((uint8_t *) bus->kdbus_buffer + d->vec.offset);
- header_size = d->vec.size;
- }
+ if (!h) {
+ h = (struct bus_header *)((uint8_t *)bus->kdbus_buffer + d->vec.offset);
- footer = (uint8_t*) bus->kdbus_buffer + d->vec.offset;
- footer_size = d->vec.size;
+ if (!bus_header_is_complete(h, d->vec.size))
+ return -EBADMSG;
+ }
n_bytes += d->vec.size;
- last_was_memfd = false;
break;
case KDBUS_ITEM_PAYLOAD_MEMFD:
- if (!header) /* memfd cannot be first part */
+ if (!h)
return -EBADMSG;
n_bytes += d->memfd.size;
- last_was_memfd = true;
break;
case KDBUS_ITEM_FDS: {
@@ -472,29 +466,23 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) {
}
}
- if (last_was_memfd) /* memfd cannot be last part */
+ if (!h)
return -EBADMSG;
- if (!header)
- return -EBADMSG;
+ r = bus_header_message_size(h, &total);
+ if (r < 0)
+ return r;
- if (header_size < sizeof(struct bus_header))
+ if (n_bytes != total)
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)
+ if (h->version != 2 ||
+ h->endian != BUS_NATIVE_ENDIAN)
return -EPROTOTYPE;
- r = bus_message_from_header(
- bus,
- header, header_size,
- footer, footer_size,
- n_bytes,
- fds, n_fds,
- NULL,
- seclabel, 0, &m);
+ r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m);
if (r < 0)
return r;
@@ -574,11 +562,10 @@ 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 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. */
+ * is faked by some data bus proxy and it
+ * lacks that information about the real
+ * client since SO_PEERCRED is used for
+ * that. */
if (d->pids.pid > 0) {
m->creds.pid = (pid_t) d->pids.pid;
@@ -594,8 +581,7 @@ 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;
@@ -673,6 +659,7 @@ 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:
@@ -775,7 +762,7 @@ 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->dbus2.cookie != k->cookie) {
+ if ((uint64_t) m->header->serial != 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 a9382dfc0e..3f2d6e74c5 100644
--- a/src/libsystemd/sd-bus/bus-message.c
+++ b/src/libsystemd/sd-bus/bus-message.c
@@ -169,17 +169,16 @@ 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->fields_size;
+ old_size = sizeof(struct bus_header) + m->header->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)
@@ -202,7 +201,7 @@ static void *message_extend_fields(sd_bus_message *m, size_t align, size_t sz, b
op = m->header;
m->header = np;
- m->fields_size = new_size - sizeof(struct bus_header);
+ m->header->fields_size = new_size - sizeof(struct bus_header);
/* Adjust quick access pointers */
m->path = adjust_pointer(m->path, op, old_size, m->header);
@@ -230,7 +229,7 @@ poison:
static int message_append_field_string(
sd_bus_message *m,
- uint64_t h,
+ uint8_t h,
char type,
const char *s,
const char **ret) {
@@ -240,10 +239,6 @@ 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);
@@ -254,12 +249,13 @@ static int message_append_field_string(
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- /* (field id 64bit, ((string + NUL) + NUL + signature string 's') */
- p = message_extend_fields(m, 8, 8 + l + 1 + 1 + 1, true);
+ /* (field id byte + 7x padding, ((string + NUL) + NUL + signature string 's') */
+ p = message_extend_fields(m, 8, 1 + 7 + l + 1 + 1 + 1, true);
if (!p)
return -ENOMEM;
- *((uint64_t*) p) = h;
+ p[0] = h;
+ memzero(p+1, 7);
memcpy(p+8, s, l);
p[8+l] = 0;
p[8+l+1] = 0;
@@ -274,7 +270,7 @@ static int message_append_field_string(
if (!p)
return -ENOMEM;
- p[0] = (uint8_t) h;
+ p[0] = h;
p[1] = 1;
p[2] = type;
p[3] = 0;
@@ -291,7 +287,7 @@ static int message_append_field_string(
static int message_append_field_signature(
sd_bus_message *m,
- uint64_t h,
+ uint8_t h,
const char *s,
const char **ret) {
@@ -300,11 +296,7 @@ static int message_append_field_signature(
assert(m);
- /* dbus1 only allows 8bit header field ids */
- if (h > 0xFF)
- return -EINVAL;
-
- /* dbus1 doesn't allow signatures over 8bit, let's enforce
+ /* dbus1 doesn't allow signatures over 32bit, let's enforce
* this globally, to not risk convertability */
l = strlen(s);
if (l > 255)
@@ -321,7 +313,7 @@ static int message_append_field_signature(
if (!p)
return -ENOMEM;
- p[0] = (uint8_t) h;
+ p[0] = h;
p[1] = 1;
p[2] = SD_BUS_TYPE_SIGNATURE;
p[3] = 0;
@@ -335,23 +327,20 @@ static int message_append_field_signature(
return 0;
}
-static int message_append_field_uint32(sd_bus_message *m, uint64_t h, uint32_t x) {
+static int message_append_field_uint32(sd_bus_message *m, uint8_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 64bit + ((value + NUL + signature string 'u') */
+ /* (field id byte + 7x padding + ((value + NUL + signature string 'u') */
- p = message_extend_fields(m, 8, 8 + 4 + 1 + 1, true);
+ p = message_extend_fields(m, 8, 1 + 7 + 4 + 1 + 1, true);
if (!p)
return -ENOMEM;
- *((uint64_t*) p) = h;
+ p[0] = h;
+ memzero(p+1, 7);
*((uint32_t*) (p + 8)) = x;
p[12] = 0;
p[13] = 'u';
@@ -361,9 +350,9 @@ static int message_append_field_uint32(sd_bus_message *m, uint64_t h, uint32_t x
if (!p)
return -ENOMEM;
- p[0] = (uint8_t) h;
+ p[0] = h;
p[1] = 1;
- p[2] = 'u';
+ p[2] = SD_BUS_TYPE_UINT32;
p[3] = 0;
((uint32_t*) p)[1] = x;
@@ -372,54 +361,10 @@ static int message_append_field_uint32(sd_bus_message *m, uint64_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 *header,
- size_t header_accessible,
- void *footer,
- size_t footer_accessible,
- size_t message_size,
+ void *buffer,
+ size_t length,
int *fds,
unsigned n_fds,
const struct ucred *ucred,
@@ -432,24 +377,21 @@ int bus_message_from_header(
size_t a, label_sz;
assert(bus);
- assert(header || header_accessible <= 0);
- assert(footer || footer_accessible <= 0);
+ assert(buffer || length <= 0);
assert(fds || n_fds <= 0);
assert(ret);
- if (header_accessible < sizeof(struct bus_header))
+ if (length < sizeof(struct bus_header))
return -EBADMSG;
- if (header_accessible > message_size)
- return -EBADMSG;
- if (footer_accessible > message_size)
- return -EBADMSG;
-
- h = header;
+ h = buffer;
if (h->version != 1 &&
h->version != 2)
return -EBADMSG;
+ if (h->serial == 0)
+ return -EBADMSG;
+
if (h->type == _SD_BUS_MESSAGE_TYPE_INVALID)
return -EBADMSG;
@@ -457,8 +399,6 @@ 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) {
@@ -472,48 +412,7 @@ int bus_message_from_header(
m->n_ref = 1;
m->sealed = true;
- 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->header = h;
m->fds = fds;
m->n_fds = n_fds;
@@ -561,21 +460,19 @@ int bus_message_from_malloc(
size_t sz;
int r;
- 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);
+ r = bus_message_from_header(bus, buffer, length, fds, n_fds, ucred, label, 0, &m);
if (r < 0)
return r;
- sz = length - sizeof(struct bus_header) - ALIGN8(m->fields_size);
+ if (length != BUS_MESSAGE_SIZE(m)) {
+ r = -EBADMSG;
+ goto fail;
+ }
+
+ sz = length - sizeof(struct bus_header) - ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
if (sz > 0) {
m->n_body_parts = 1;
- m->body.data = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN8(m->fields_size);
+ m->body.data = (uint8_t*) buffer + sizeof(struct bus_header) + ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
m->body.size = sz;
m->body.sealed = true;
m->body.memfd = -1;
@@ -734,17 +631,8 @@ 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;
-
- 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);
- }
+ r = message_append_field_uint32(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, (uint32_t) t->reply_cookie);
if (r < 0)
goto fail;
@@ -963,14 +851,9 @@ _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);
-
- c = BUS_MESSAGE_COOKIE(m);
- if (c == 0)
- return -ENODATA;
+ assert_return(m->header->serial != 0, -ENODATA);
*cookie = BUS_MESSAGE_COOKIE(m);
return 0;
@@ -979,9 +862,7 @@ _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);
-
- if (m->reply_cookie == 0)
- return -ENODATA;
+ assert_return(m->reply_cookie != 0, -ENODATA);
*cookie = m->reply_cookie;
return 0;
@@ -1086,11 +967,9 @@ _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)
@@ -1105,11 +984,9 @@ _public_ int sd_bus_message_is_signal(
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)
@@ -1344,13 +1221,7 @@ 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,
- bool force_inline) {
-
+static void *message_extend_body(sd_bus_message *m, size_t align, size_t sz, bool add_offset) {
size_t start_body, end_body, padding, added;
void *p;
int r;
@@ -1362,15 +1233,14 @@ static void *message_extend_body(
if (m->poisoned)
return NULL;
- start_body = ALIGN_TO((size_t) m->body_size, align);
+ start_body = ALIGN_TO((size_t) m->header->body_size, align);
end_body = start_body + sz;
- padding = start_body - m->body_size;
+ padding = start_body - m->header->body_size;
added = padding + sz;
/* Check for 32bit overflows */
- if (end_body > (size_t) ((uint32_t) -1) ||
- end_body < start_body) {
+ if (end_body > (size_t) ((uint32_t) -1)) {
m->poisoned = true;
return NULL;
}
@@ -1382,8 +1252,7 @@ static void *message_extend_body(
add_new_part =
m->n_body_parts <= 0 ||
m->body_end->sealed ||
- (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 */
+ padding != ALIGN_TO(m->body_end->size, align) - m->body_end->size;
if (add_new_part) {
if (padding > 0) {
@@ -1432,7 +1301,7 @@ static void *message_extend_body(
/* Return something that is not NULL and is aligned */
p = (uint8_t *) NULL + align;
- m->body_size = end_body;
+ m->header->body_size = end_body;
message_extend_containers(m, added);
if (add_offset) {
@@ -1558,7 +1427,7 @@ 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, false);
+ a = message_extend_body(m, align, sz, true);
if (!a)
return -ENOMEM;
@@ -1627,7 +1496,7 @@ 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, false);
+ a = message_extend_body(m, align, sz, false);
if (!a)
return -ENOMEM;
@@ -1701,13 +1570,13 @@ _public_ int sd_bus_message_append_string_space(
}
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- a = message_extend_body(m, 1, size + 1, true, false);
+ a = message_extend_body(m, 1, size + 1, true);
if (!a)
return -ENOMEM;
*s = a;
} else {
- a = message_extend_body(m, 4, 4 + size + 1, false, false);
+ a = message_extend_body(m, 4, 4 + size + 1, false);
if (!a)
return -ENOMEM;
@@ -1812,14 +1681,14 @@ static int bus_message_open_array(
return alignment;
/* Add alignment padding and add to offset list */
- if (!message_extend_body(m, alignment, 0, false, false))
+ if (!message_extend_body(m, alignment, 0, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
- *begin = m->body_size;
+ *begin = m->header->body_size;
*need_offsets = r == 0;
} else {
void *a, *op;
@@ -1830,7 +1699,7 @@ static int bus_message_open_array(
if (alignment < 0)
return alignment;
- a = message_extend_body(m, 4, 4, false, false);
+ a = message_extend_body(m, 4, 4, false);
if (!a)
return -ENOMEM;
@@ -1839,7 +1708,7 @@ 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, false))
+ if (!message_extend_body(m, alignment, 0, false))
return -ENOMEM;
/* location of array size might have changed so let's readjust a */
@@ -1892,7 +1761,7 @@ 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, false))
+ if (!message_extend_body(m, 8, 0, false))
return -ENOMEM;
} else {
@@ -1900,7 +1769,7 @@ static int bus_message_open_variant(
void *a;
l = strlen(contents);
- a = message_extend_body(m, 1, 1 + l + 1, false, false);
+ a = message_extend_body(m, 1, 1 + l + 1, false);
if (!a)
return -ENOMEM;
@@ -1966,18 +1835,18 @@ static int bus_message_open_struct(
if (alignment < 0)
return alignment;
- if (!message_extend_body(m, alignment, 0, false, false))
+ if (!message_extend_body(m, alignment, 0, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
- *begin = m->body_size;
+ *begin = m->header->body_size;
*need_offsets = r == 0;
} else {
/* Align contents to 8 byte boundary */
- if (!message_extend_body(m, 8, 0, false, false))
+ if (!message_extend_body(m, 8, 0, false))
return -ENOMEM;
}
@@ -2027,18 +1896,18 @@ static int bus_message_open_dict_entry(
if (alignment < 0)
return alignment;
- if (!message_extend_body(m, alignment, 0, false, false))
+ if (!message_extend_body(m, alignment, 0, false))
return -ENOMEM;
r = bus_gvariant_is_fixed_size(contents);
if (r < 0)
return r;
- *begin = m->body_size;
+ *begin = m->header->body_size;
*need_offsets = r == 0;
} else {
/* Align contents to 8 byte boundary */
- if (!message_extend_body(m, 8, 0, false, false))
+ if (!message_extend_body(m, 8, 0, false))
return -ENOMEM;
}
@@ -2079,7 +1948,7 @@ _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->body_size;
+ before = m->header->body_size;
if (type == SD_BUS_TYPE_ARRAY)
r = bus_message_open_array(m, c, contents, &array_size, &begin, &need_offsets);
@@ -2112,6 +1981,66 @@ _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);
@@ -2127,20 +2056,20 @@ 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 = bus_gvariant_determine_word_size(payload, c->n_offsets);
+ sz = determine_word_size(payload, c->n_offsets);
- a = message_extend_body(m, 1, sz * c->n_offsets, true, false);
+ a = message_extend_body(m, 1, sz * c->n_offsets, true);
if (!a)
return -ENOMEM;
for (i = 0; i < c->n_offsets; i++)
- bus_gvariant_write_word_le(a + sz*i, sz, c->offsets[i] - c->begin);
+ 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, false); /* let's add offset to parent */
+ a = message_extend_body(m, 1, 0, true); /* let's add offset to parent */
if (!a)
return -ENOMEM;
}
@@ -2161,7 +2090,7 @@ 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, false);
+ a = message_extend_body(m, 1, 1 + l, true);
if (!a)
return -ENOMEM;
@@ -2218,18 +2147,18 @@ 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, false);
+ a = message_extend_body(m, 1, 0, add_offset);
if (!a)
return -ENOMEM;
} else {
size_t sz;
unsigned j;
- assert(c->offsets[c->n_offsets-1] == m->body_size);
+ assert(c->offsets[c->n_offsets-1] == m->header->body_size);
- sz = bus_gvariant_determine_word_size(m->body_size - c->begin, n_variable);
+ sz = determine_word_size(m->header->body_size - c->begin, n_variable);
- a = message_extend_body(m, 1, sz * n_variable, add_offset, false);
+ a = message_extend_body(m, 1, sz * n_variable, add_offset);
if (!a)
return -ENOMEM;
@@ -2258,7 +2187,7 @@ static int bus_message_close_struct(sd_bus_message *m, struct bus_container *c,
k = n_variable - 1 - j;
- bus_gvariant_write_word_le(a + k * sz, sz, c->offsets[i] - c->begin);
+ write_word_le(a + k * sz, sz, c->offsets[i] - c->begin);
j++;
}
@@ -2589,7 +2518,7 @@ _public_ int sd_bus_message_append_array_space(
if (r < 0)
return r;
- a = message_extend_body(m, align, size, false, false);
+ a = message_extend_body(m, align, size, false);
if (!a)
return -ENOMEM;
@@ -2718,7 +2647,7 @@ _public_ int sd_bus_message_append_array_memfd(
if (r < 0)
return r;
- a = message_extend_body(m, align, 0, false, false);
+ a = message_extend_body(m, align, 0, false);
if (!a)
return -ENOMEM;
@@ -2732,7 +2661,7 @@ _public_ int sd_bus_message_append_array_memfd(
part->size = size;
copy_fd = -1;
- m->body_size += size;
+ m->header->body_size += size;
message_extend_containers(m, size);
return sd_bus_message_close_container(m);
@@ -2802,7 +2731,7 @@ _public_ int sd_bus_message_append_string_memfd(
}
if (!BUS_MESSAGE_IS_GVARIANT(m)) {
- a = message_extend_body(m, 4, 4, false, false);
+ a = message_extend_body(m, 4, 4, false);
if (!a)
return -ENOMEM;
@@ -2819,11 +2748,11 @@ _public_ int sd_bus_message_append_string_memfd(
part->size = size;
copy_fd = -1;
- m->body_size += size;
+ m->header->body_size += size;
message_extend_containers(m, size);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- r = message_add_offset(m, m->body_size);
+ r = message_add_offset(m, m->header->body_size);
if (r < 0) {
m->poisoned = true;
return -ENOMEM;
@@ -2858,66 +2787,34 @@ _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);
- /* 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 (BUS_MESSAGE_IS_GVARIANT(m)) {
- const char *signature;
- size_t sz, l;
- void *d;
-
- /* Add offset table to end of fields array */
- if (m->n_header_offsets >= 1) {
- uint8_t *a;
- unsigned i;
-
- assert(m->fields_size == m->header_offsets[m->n_header_offsets-1]);
-
- 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 */
+ if (!BUS_MESSAGE_IS_GVARIANT(m))
+ return 0;
- signature = strempty(m->root_container.signature);
- l = strlen(signature);
+ if (m->n_header_offsets < 1)
+ return 0;
- 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;
+ assert(m->header->fields_size == m->header_offsets[m->n_header_offsets-1]);
- *(uint8_t*) d = 0;
- memcpy((uint8_t*) d + 1, signature, l);
+ sz = determine_word_size(m->header->fields_size, m->n_header_offsets);
- bus_gvariant_write_word_le((uint8_t*) d + 1 + l, sz, sizeof(struct bus_header) + m->fields_size);
+ a = message_extend_fields(m, 1, sz * m->n_header_offsets, false);
+ if (!a)
+ return -ENOMEM;
- 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;
- }
+ for (i = 0; i < m->n_header_offsets; i++)
+ write_word_le(a + sz*i, sz, m->header_offsets[i]);
return 0;
}
int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
struct bus_body_part *part;
- size_t a;
+ size_t l, a;
unsigned i;
int r;
@@ -2932,10 +2829,6 @@ 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 &&
@@ -2948,9 +2841,8 @@ 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, but only on dbus1 */
- if (!isempty(m->root_container.signature) && !BUS_MESSAGE_IS_GVARIANT(m)) {
+ /* If there's a non-trivial signature set, then add it in here */
+ if (!isempty(m->root_container.signature)) {
r = message_append_field_signature(m, BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
if (r < 0)
return r;
@@ -2966,30 +2858,24 @@ int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
if (r < 0)
return r;
- if (BUS_MESSAGE_IS_GVARIANT(m))
- m->header->dbus2.cookie = cookie;
- else
- m->header->dbus1.serial = (uint32_t) cookie;
-
+ m->header->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. */
- a = ALIGN8(m->fields_size) - m->fields_size;
+ l = BUS_MESSAGE_FIELDS_SIZE(m);
+ a = ALIGN8(l) - l;
if (a > 0)
- memzero((uint8_t*) BUS_MESSAGE_FIELDS(m) + m->fields_size, a);
+ memzero((uint8_t*) BUS_MESSAGE_FIELDS(m) + l, 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) &&
- part != m->body_end) { /* The last part may never be sent as memfd */
+ if (part->memfd >= 0 && !part->sealed && (part->size > MEMFD_MIN_SIZE || m->bus->use_memfd < 0)) {
uint64_t sz;
/* Try to seal it if that makes
@@ -3009,7 +2895,7 @@ int bus_message_seal(sd_bus_message *m, uint64_t cookie, usec_t timeout) {
}
}
- m->root_container.end = m->user_body_size;
+ m->root_container.end = BUS_MESSAGE_BODY_SIZE(m);
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;
@@ -3295,7 +3181,7 @@ static int message_peek_body(
padding = start - *rindex;
end = start + nbytes;
- if (end > m->user_body_size)
+ if (end > BUS_MESSAGE_BODY_SIZE(m))
return -EBADMSG;
part = find_part(m, *rindex, padding, (void**) &q);
@@ -3668,14 +3554,14 @@ static int bus_message_enter_array(
unsigned i;
/* gvariant: variable length array */
- sz = bus_gvariant_determine_word_size(c->item_size, 0);
+ sz = 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 = bus_gvariant_read_word_le(q, sz);
+ framing = read_word_le(q, sz);
if (framing > c->item_size - sz)
return -EBADMSG;
if ((c->item_size - framing) % sz != 0)
@@ -3695,7 +3581,7 @@ static int bus_message_enter_array(
for (i = 0; i < *n_offsets; i++) {
size_t x;
- x = bus_gvariant_read_word_le((uint8_t*) q + i * sz, sz);
+ x = read_word_le((uint8_t*) q + i * sz, sz);
if (x > c->item_size - sz)
return -EBADMSG;
if (x < p)
@@ -3818,7 +3704,7 @@ static int build_struct_offsets(
return 0;
}
- sz = bus_gvariant_determine_word_size(size, 0);
+ sz = determine_word_size(size, 0);
if (sz <= 0)
return -EBADMSG;
@@ -3892,7 +3778,7 @@ static int build_struct_offsets(
if (v > 0) {
v--;
- x = bus_gvariant_read_word_le((uint8_t*) q + v*sz, sz);
+ x = read_word_le((uint8_t*) q + v*sz, sz);
if (x >= size)
return -EBADMSG;
if (m->rindex + x < previous)
@@ -4773,12 +4659,10 @@ _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;
@@ -4847,7 +4731,7 @@ static int message_peek_fields(
assert(rindex);
assert(align > 0);
- return buffer_peek(BUS_MESSAGE_FIELDS(m), m->fields_size, rindex, align, nbytes, ret);
+ return buffer_peek(BUS_MESSAGE_FIELDS(m), BUS_MESSAGE_FIELDS_SIZE(m), rindex, align, nbytes, ret);
}
static int message_peek_field_uint32(
@@ -4877,33 +4761,6 @@ 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),
@@ -5149,106 +5006,59 @@ int bus_message_parse_fields(sd_bus_message *m) {
assert(m);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
- 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;
- }
+ void *q;
- 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);
+ sz = determine_word_size(BUS_MESSAGE_FIELDS_SIZE(m), 0);
if (sz > 0) {
size_t framing;
- void *q;
- ri = m->fields_size - sz;
+ ri = BUS_MESSAGE_FIELDS_SIZE(m) - sz;
r = message_peek_fields(m, &ri, 1, sz, &q);
if (r < 0)
return r;
- framing = bus_gvariant_read_word_le(q, sz);
- if (framing >= m->fields_size - sz)
+ framing = read_word_le(q, sz);
+ if (framing >= BUS_MESSAGE_FIELDS_SIZE(m) - sz)
return -EBADMSG;
- if ((m->fields_size - framing) % sz != 0)
+ if ((BUS_MESSAGE_FIELDS_SIZE(m) - framing) % sz != 0)
return -EBADMSG;
ri = framing;
- r = message_peek_fields(m, &ri, 1, m->fields_size - framing, &offsets);
+ r = message_peek_fields(m, &ri, 1, BUS_MESSAGE_FIELDS_SIZE(m) - framing, &offsets);
if (r < 0)
return r;
- n_offsets = (m->fields_size - framing) / sz;
+ n_offsets = (BUS_MESSAGE_FIELDS_SIZE(m) - framing) / sz;
}
- } else
- m->user_body_size = m->body_size;
+ }
ri = 0;
- while (ri < m->fields_size) {
+ while (ri < BUS_MESSAGE_FIELDS_SIZE(m)) {
_cleanup_free_ char *sig = NULL;
const char *signature;
- uint64_t field_type;
+ uint8_t *header;
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(bus_gvariant_read_word_le((uint8_t*) offsets + (i-1)*sz, sz), 8);
-
- 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;
+ ri = ALIGN_TO(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;
+
if (BUS_MESSAGE_IS_GVARIANT(m)) {
size_t where, end;
char *b;
void *q;
- end = bus_gvariant_read_word_le((uint8_t*) offsets + i*sz, sz);
+ end = read_word_le((uint8_t*) offsets + i*sz, sz);
if (end < ri)
return -EBADMSG;
@@ -5275,8 +5085,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
return r;
}
- switch (field_type) {
-
+ switch (*header) {
case _BUS_MESSAGE_HEADER_INVALID:
return -EBADMSG;
@@ -5360,9 +5169,6 @@ 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;
@@ -5382,38 +5188,26 @@ int bus_message_parse_fields(sd_bus_message *m) {
break;
}
- case BUS_MESSAGE_HEADER_REPLY_SERIAL:
+ case BUS_MESSAGE_HEADER_REPLY_SERIAL: {
+ uint32_t serial;
if (m->reply_cookie != 0)
return -EBADMSG;
- if (BUS_MESSAGE_IS_GVARIANT(m)) {
- /* 64bit on dbus2 */
-
- 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;
+ if (!streq(signature, "u"))
+ return -EBADMSG;
- r = message_peek_field_uint32(m, &ri, item_size, &serial);
- if (r < 0)
- return r;
+ r = message_peek_field_uint32(m, &ri, item_size, &serial);
+ if (r < 0)
+ return r;
- m->reply_cookie = serial;
- }
+ m->reply_cookie = serial;
if (m->reply_cookie == 0)
return -EBADMSG;
break;
+ }
case BUS_MESSAGE_HEADER_UNIX_FDS:
if (unix_fds_set)
@@ -5485,13 +5279,13 @@ int bus_message_parse_fields(sd_bus_message *m) {
if (streq_ptr(m->sender, "org.freedesktop.DBus.Local"))
return -EBADMSG;
- m->root_container.end = m->user_body_size;
+ m->root_container.end = BUS_MESSAGE_BODY_SIZE(m);
if (BUS_MESSAGE_IS_GVARIANT(m)) {
r = build_struct_offsets(
m,
m->root_container.signature,
- m->user_body_size,
+ BUS_MESSAGE_BODY_SIZE(m),
&m->root_container.item_size,
&m->root_container.offsets,
&m->root_container.n_offsets);
@@ -5645,6 +5439,40 @@ 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 32955329b4..b4cdce7bf4 100644
--- a/src/libsystemd/sd-bus/bus-message.h
+++ b/src/libsystemd/sd-bus/bus-message.h
@@ -99,18 +99,7 @@ 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;
@@ -123,7 +112,7 @@ struct sd_bus_message {
int *fds;
struct bus_container root_container, *containers;
- size_t n_containers;
+ unsigned n_containers;
size_t containers_allocated;
struct iovec *iovec;
@@ -149,9 +138,7 @@ struct sd_bus_message {
unsigned n_header_offsets;
};
-static inline bool BUS_MESSAGE_NEED_BSWAP(sd_bus_message *m) {
- return m->header->endian != BUS_NATIVE_ENDIAN;
-}
+#define BUS_MESSAGE_NEED_BSWAP(m) ((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;
@@ -166,23 +153,29 @@ 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) {
- if (m->header->version == 2)
- return BUS_MESSAGE_BSWAP64(m, m->header->dbus2.cookie);
+ /* Note that we return the serial converted to a 64bit value here */
+ return BUS_MESSAGE_BSWAP32(m, m->header->serial);
+}
- return BUS_MESSAGE_BSWAP32(m, m->header->dbus1.serial);
+static inline uint32_t BUS_MESSAGE_BODY_SIZE(sd_bus_message *m) {
+ return BUS_MESSAGE_BSWAP32(m, m->header->body_size);
}
-static inline size_t BUS_MESSAGE_SIZE(sd_bus_message *m) {
+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) {
return
sizeof(struct bus_header) +
- ALIGN8(m->fields_size) +
- m->body_size;
+ ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) +
+ BUS_MESSAGE_BODY_SIZE(m);
}
-static inline size_t BUS_MESSAGE_BODY_BEGIN(sd_bus_message *m) {
+static inline uint32_t BUS_MESSAGE_BODY_BEGIN(sd_bus_message *m) {
return
sizeof(struct bus_header) +
- ALIGN8(m->fields_size);
+ ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
}
static inline void* BUS_MESSAGE_FIELDS(sd_bus_message *m) {
@@ -200,10 +193,7 @@ int bus_message_read_strv_extend(sd_bus_message *m, char ***l);
int bus_message_from_header(
sd_bus *bus,
void *header,
- size_t header_accessible,
- void *footer,
- size_t footer_accessible,
- size_t message_size,
+ size_t length,
int *fds,
unsigned n_fds,
const struct ucred *ucred,
@@ -227,6 +217,9 @@ 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 183af89a63..6431dfbff8 100644
--- a/src/libsystemd/sd-bus/bus-protocol.h
+++ b/src/libsystemd/sd-bus/bus-protocol.h
@@ -23,38 +23,21 @@
#include <endian.h>
-#include "macro.h"
-
/* Packet header */
-struct _packed_ bus_header {
- /* The first four fields are identical for dbus1, and dbus2 */
+struct bus_header {
uint8_t endian;
uint8_t type;
uint8_t flags;
uint8_t version;
-
- 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! */
- };
-};
+ 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_;
/* Endianness */
diff --git a/src/libsystemd/sd-bus/test-bus-gvariant.c b/src/libsystemd/sd-bus/test-bus-gvariant.c
index 992edacb28..6992ec44de 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_close_unref_ sd_bus *bus = NULL;
+ _cleanup_bus_unref_ sd_bus *bus = NULL;
_cleanup_free_ void *blob;
size_t sz;
int r;
@@ -145,8 +145,6 @@ 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,
@@ -164,15 +162,13 @@ static void test_marshal(void) {
g_type_init();
#endif
- 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));
+ 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);
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, m->user_body_size, false, NULL, NULL);
- assert_se(g_variant_is_normal_form(v));
+ v = g_variant_new_from_data(G_VARIANT_TYPE("(a(usv))"), m->body.data, BUS_MESSAGE_BODY_SIZE(m), false, NULL, NULL);
t = g_variant_print(v, TRUE);
printf("%s\n", t);
g_free(t);
@@ -184,20 +180,6 @@ 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 2024-11-10 14:11:02 +0000