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authorAndrew Tridgell <tridge@samba.org>2005-06-03 06:04:34 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 13:17:26 -0500
commitf1ade86d756a242e41d610981b948d03c68fbd4b (patch)
tree4720accba25257cfba42a16c9ef3460e8ed4a3db /source4/lib/messaging/messaging.c
parentdd43abbd325874b7b6bcfdad453b7507ace4314a (diff)
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r7211: - use ioctl(FIONREAD) to remove the artificial limit on messaging size
- avoid a memcpy (This used to be commit 753839c358f45c02927b137092828f3a79158083)
Diffstat (limited to 'source4/lib/messaging/messaging.c')
-rw-r--r--source4/lib/messaging/messaging.c93
1 files changed, 51 insertions, 42 deletions
diff --git a/source4/lib/messaging/messaging.c b/source4/lib/messaging/messaging.c
index 4d2cd9c910..eb526fd391 100644
--- a/source4/lib/messaging/messaging.c
+++ b/source4/lib/messaging/messaging.c
@@ -31,9 +31,6 @@
/* change the message version with any incompatible changes in the protocol */
#define MESSAGING_VERSION 1
-/* maximum message size */
-#define MESSAGING_MAX_SIZE 512
-
struct messaging_context {
uint32_t server_id;
struct socket_context *sock;
@@ -63,15 +60,15 @@ struct messaging_rec {
struct messaging_context *msg;
const char *path;
- struct {
+ struct messaging_header {
uint32_t version;
uint32_t msg_type;
uint32_t from;
uint32_t to;
uint32_t length;
- } header;
+ } *header;
- DATA_BLOB data;
+ DATA_BLOB packet;
};
@@ -106,11 +103,14 @@ static void messaging_dispatch(struct messaging_context *msg, struct messaging_r
struct dispatch_fn *d, *next;
for (d=msg->dispatch;d;d=next) {
next = d->next;
- if (d->msg_type == rec->header.msg_type) {
- d->fn(msg, d->private, d->msg_type, rec->header.from, &rec->data);
+ if (d->msg_type == rec->header->msg_type) {
+ DATA_BLOB data;
+ data.data = rec->packet.data + sizeof(*rec->header);
+ data.length = rec->header->length;
+ d->fn(msg, d->private, d->msg_type, rec->header->from, &data);
}
}
- rec->header.length = 0;
+ rec->header->length = 0;
}
@@ -120,24 +120,15 @@ static void messaging_dispatch(struct messaging_context *msg, struct messaging_r
static NTSTATUS try_send(struct messaging_rec *rec)
{
struct messaging_context *msg = rec->msg;
- DATA_BLOB blob;
size_t nsent;
void *priv;
NTSTATUS status;
- blob = data_blob_talloc(rec, NULL, sizeof(rec->header) + rec->data.length);
- NT_STATUS_HAVE_NO_MEMORY(blob.data);
-
- memcpy(blob.data, &rec->header, sizeof(rec->header));
- memcpy(blob.data + sizeof(rec->header), rec->data.data, rec->data.length);
-
/* we send with privileges so messages work from any context */
priv = root_privileges();
- status = socket_sendto(msg->sock, &blob, &nsent, 0, rec->path, 0);
+ status = socket_sendto(msg->sock, &rec->packet, &nsent, 0, rec->path, 0);
talloc_free(priv);
- data_blob_free(&blob);
-
return status;
}
@@ -155,7 +146,7 @@ static void messaging_send_handler(struct messaging_context *msg)
}
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1,("messaging: Lost message from %u to %u of type %u - %s\n",
- rec->header.from, rec->header.to, rec->header.msg_type,
+ rec->header->from, rec->header->to, rec->header->msg_type,
nt_errstr(status)));
}
DLIST_REMOVE(msg->pending, rec);
@@ -173,16 +164,31 @@ static void messaging_recv_handler(struct messaging_context *msg)
{
struct messaging_rec *rec;
NTSTATUS status;
- uint8_t data[MESSAGING_MAX_SIZE];
+ DATA_BLOB packet;
size_t msize;
+ int dsize=0;
- status = socket_recv(msg->sock, data, sizeof(data), &msize, 0);
+ /* see how many bytes are in the next packet */
+ if (ioctl(socket_get_fd(msg->sock), FIONREAD, &dsize) != 0) {
+ DEBUG(0,("FIONREAD failed in messaging - %s\n", strerror(errno)));
+ return;
+ }
+
+ packet = data_blob_talloc(msg, NULL, dsize);
+ if (packet.data == NULL) {
+ /* assume this is temporary and retry */
+ return;
+ }
+
+ status = socket_recv(msg->sock, packet.data, dsize, &msize, 0);
if (!NT_STATUS_IS_OK(status)) {
+ data_blob_free(&packet);
return;
}
- if (msize < sizeof(rec->header)) {
+ if (msize < sizeof(*rec->header)) {
DEBUG(0,("messaging: bad message of size %d\n", msize));
+ data_blob_free(&packet);
return;
}
@@ -191,19 +197,15 @@ static void messaging_recv_handler(struct messaging_context *msg)
smb_panic("Unable to allocate messaging_rec");
}
+ talloc_steal(rec, packet.data);
rec->msg = msg;
rec->path = msg->path;
+ rec->header = (struct messaging_header *)packet.data;
+ rec->packet = packet;
- memcpy(&rec->header, data, sizeof(rec->header));
- if (msize != sizeof(rec->header) + rec->header.length) {
+ if (msize != sizeof(*rec->header) + rec->header->length) {
DEBUG(0,("messaging: bad message header size %d should be %d\n",
- rec->header.length, msize - sizeof(rec->header)));
- talloc_free(rec);
- return;
- }
-
- rec->data = data_blob_talloc(rec, data+sizeof(rec->header), rec->header.length);
- if (rec->data.data == NULL) {
+ rec->header->length, msize - sizeof(*rec->header)));
talloc_free(rec);
return;
}
@@ -272,22 +274,29 @@ NTSTATUS messaging_send(struct messaging_context *msg, uint32_t server,
{
struct messaging_rec *rec;
NTSTATUS status;
+ size_t dlength = data?data->length:0;
rec = talloc(msg, struct messaging_rec);
if (rec == NULL) {
return NT_STATUS_NO_MEMORY;
}
- rec->msg = msg;
- rec->header.version = MESSAGING_VERSION;
- rec->header.msg_type = msg_type;
- rec->header.from = msg->server_id;
- rec->header.to = server;
- rec->header.length = data?data->length:0;
- if (rec->header.length != 0) {
- rec->data = data_blob_talloc(rec, data->data, data->length);
- } else {
- rec->data = data_blob(NULL, 0);
+ rec->packet = data_blob_talloc(rec, NULL, sizeof(*rec->header) + dlength);
+ if (rec->packet.data == NULL) {
+ talloc_free(rec);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ rec->msg = msg;
+ rec->header = (struct messaging_header *)rec->packet.data;
+ rec->header->version = MESSAGING_VERSION;
+ rec->header->msg_type = msg_type;
+ rec->header->from = msg->server_id;
+ rec->header->to = server;
+ rec->header->length = dlength;
+ if (dlength != 0) {
+ memcpy(rec->packet.data + sizeof(*rec->header),
+ data->data, dlength);
}
rec->path = messaging_path(rec, server);