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-rw-r--r--source4/lib/stream/config.mk9
-rw-r--r--source4/lib/stream/packet.c312
-rw-r--r--source4/lib/stream/packet.h47
3 files changed, 368 insertions, 0 deletions
diff --git a/source4/lib/stream/config.mk b/source4/lib/stream/config.mk
new file mode 100644
index 0000000000..1ec650ab10
--- /dev/null
+++ b/source4/lib/stream/config.mk
@@ -0,0 +1,9 @@
+
+################################################
+# Start SUBSYSTEM LIBPACKET
+[SUBSYSTEM::LIBPACKET]
+INIT_OBJ_FILES = \
+ packet.o
+NOPROTO=YES
+# End SUBSYSTEM LIBPACKET
+################################################
diff --git a/source4/lib/stream/packet.c b/source4/lib/stream/packet.c
new file mode 100644
index 0000000000..971135ff9b
--- /dev/null
+++ b/source4/lib/stream/packet.c
@@ -0,0 +1,312 @@
+/*
+ Unix SMB/CIFS mplementation.
+
+ helper layer for breaking up streams into discrete requests
+
+ Copyright (C) Andrew Tridgell 2005
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "includes.h"
+#include "dlinklist.h"
+#include "lib/events/events.h"
+#include "lib/socket/socket.h"
+#include "lib/tls/tls.h"
+#include "lib/stream/packet.h"
+
+
+struct packet_context {
+ packet_callback_fn_t callback;
+ packet_full_request_fn_t full_request;
+ packet_error_handler_fn_t error_handler;
+ DATA_BLOB partial;
+ uint32_t initial_read_size;
+ uint32_t num_read;
+ struct tls_context *tls;
+ struct socket_context *sock;
+ struct event_context *ev;
+ size_t packet_size;
+ void *private;
+};
+
+/*
+ initialise a packet receiver
+*/
+struct packet_context *packet_init(TALLOC_CTX *mem_ctx)
+{
+ return talloc_zero(mem_ctx, struct packet_context);
+}
+
+
+/*
+ set the request callback, called when a full request is ready
+*/
+void packet_set_callback(struct packet_context *pc, packet_callback_fn_t callback)
+{
+ pc->callback = callback;
+}
+
+/*
+ set the error handler
+*/
+void packet_set_error_handler(struct packet_context *pc, packet_error_handler_fn_t handler)
+{
+ pc->error_handler = handler;
+}
+
+/*
+ set the private pointer passed to the callback functions
+*/
+void packet_set_private(struct packet_context *pc, void *private)
+{
+ pc->private = private;
+}
+
+/*
+ set the full request callback. Should return as follows:
+ NT_STATUS_OK == blob is a full request.
+ STATUS_MORE_ENTRIES == blob is not complete yet
+ any error == blob is not a valid
+*/
+void packet_set_full_request(struct packet_context *pc, packet_full_request_fn_t callback)
+{
+ pc->full_request = callback;
+}
+
+/*
+ set a tls context to use. You must either set a tls_context or a socket_context
+*/
+void packet_set_tls(struct packet_context *pc, struct tls_context *tls)
+{
+ pc->tls = tls;
+}
+
+/*
+ set a socket context to use. You must either set a tls_context or a socket_context
+*/
+void packet_set_socket(struct packet_context *pc, struct socket_context *sock)
+{
+ pc->sock = sock;
+}
+
+/*
+ set an event context. If this is set then the code will ensure that
+ packets arrive with separate events, by creating a immediate event
+ for any secondary packets when more than one packet is read at one
+ time on a socket. This can matter for code that relies on not
+ getting more than one packet per event
+*/
+void packet_set_event_context(struct packet_context *pc, struct event_context *ev)
+{
+ pc->ev = ev;
+}
+
+
+/*
+ tell the caller we have an error
+*/
+static void packet_error(struct packet_context *pc, NTSTATUS status)
+{
+ pc->tls = NULL;
+ pc->sock = NULL;
+ if (pc->error_handler) {
+ pc->error_handler(pc->private, status);
+ return;
+ }
+ /* default error handler is to free the callers private pointer */
+ if (!NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
+ DEBUG(0,("packet_error on %s - %s\n",
+ talloc_get_name(pc->private), nt_errstr(status)));
+ }
+ talloc_free(pc->private);
+ return;
+}
+
+
+/*
+ tell the caller we have EOF
+*/
+static void packet_eof(struct packet_context *pc)
+{
+ packet_error(pc, NT_STATUS_END_OF_FILE);
+}
+
+
+/*
+ used to put packets on event boundaries
+*/
+static void packet_next_event(struct event_context *ev, struct timed_event *te,
+ struct timeval t, void *private)
+{
+ struct packet_context *pc = talloc_get_type(private, struct packet_context);
+ packet_recv(pc);
+}
+
+/*
+ call this when the socket becomes readable to kick off the whole
+ stream parsing process
+*/
+void packet_recv(struct packet_context *pc)
+{
+ size_t npending;
+ NTSTATUS status;
+ size_t nread;
+ DATA_BLOB blob;
+
+ if (pc->packet_size != 0 && pc->num_read >= pc->packet_size) {
+ goto next_partial;
+ }
+
+ if (pc->packet_size != 0) {
+ /* we've already worked out how long this next packet is, so skip the
+ socket_pending() call */
+ npending = pc->packet_size - pc->num_read;
+ } else {
+ if (pc->tls) {
+ status = tls_socket_pending(pc->tls, &npending);
+ } else if (pc->sock) {
+ status = socket_pending(pc->sock, &npending);
+ } else {
+ status = NT_STATUS_CONNECTION_DISCONNECTED;
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ packet_error(pc, status);
+ return;
+ }
+ }
+
+ if (npending == 0) {
+ packet_eof(pc);
+ return;
+ }
+
+ /* possibly expand the partial packet buffer */
+ if (npending + pc->num_read > pc->partial.length) {
+ status = data_blob_realloc(pc, &pc->partial, npending+pc->num_read);
+ if (!NT_STATUS_IS_OK(status)) {
+ packet_error(pc, status);
+ return;
+ }
+ }
+
+ if (pc->tls) {
+ status = tls_socket_recv(pc->tls, pc->partial.data + pc->num_read,
+ npending, &nread);
+ } else {
+ status = socket_recv(pc->sock, pc->partial.data + pc->num_read,
+ npending, &nread, 0);
+ }
+ if (NT_STATUS_IS_ERR(status)) {
+ packet_error(pc, status);
+ return;
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ return;
+ }
+
+ if (nread == 0) {
+ packet_eof(pc);
+ return;
+ }
+
+ pc->num_read += nread;
+
+ /* see if its a full request */
+next_partial:
+ blob = pc->partial;
+ blob.length = pc->num_read;
+ status = pc->full_request(pc->private, blob, &pc->packet_size);
+ if (NT_STATUS_IS_ERR(status)) {
+ packet_error(pc, status);
+ return;
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ return;
+ }
+
+ if (pc->packet_size > pc->num_read) {
+ /* the caller made an error */
+ DEBUG(0,("Invalid packet_size %u greater than num_read %u\n",
+ pc->packet_size, pc->num_read));
+ packet_error(pc, NT_STATUS_INVALID_PARAMETER);
+ return;
+ }
+
+ /* it is a full request - give it to the caller */
+ blob = pc->partial;
+
+ if (pc->packet_size < pc->num_read) {
+ pc->partial = data_blob_talloc(pc, blob.data + pc->packet_size,
+ pc->num_read - pc->packet_size);
+ if (pc->partial.data == NULL) {
+ packet_error(pc, NT_STATUS_NO_MEMORY);
+ return;
+ }
+ data_blob_realloc(pc, &blob, pc->packet_size);
+ } else {
+ pc->partial = data_blob(NULL, 0);
+ }
+ pc->num_read -= pc->packet_size;
+ pc->packet_size = 0;
+
+ status = pc->callback(pc->private, blob);
+ if (!NT_STATUS_IS_OK(status)) {
+ packet_error(pc, status);
+ return;
+ }
+
+ if (pc->partial.length == 0) {
+ return;
+ }
+
+ /* we got multiple packets in one tcp read */
+ if (pc->ev == NULL) {
+ goto next_partial;
+ }
+
+ blob = pc->partial;
+ blob.length = pc->num_read;
+
+ status = pc->full_request(pc->private, blob, &pc->packet_size);
+ if (NT_STATUS_IS_ERR(status)) {
+ packet_error(pc, status);
+ return;
+ }
+
+ if (!NT_STATUS_IS_OK(status)) {
+ return;
+ }
+
+ event_add_timed(pc->ev, pc, timeval_zero(), packet_next_event, pc);
+}
+
+
+
+/*
+ a full request checker for NBT formatted packets (first 3 bytes are length)
+*/
+NTSTATUS packet_full_request_nbt(void *private, DATA_BLOB blob, size_t *packet_size)
+{
+ if (blob.length < 4) {
+ return STATUS_MORE_ENTRIES;
+ }
+ *packet_size = 4 + smb_len(blob.data);
+ if (*packet_size > blob.length) {
+ return STATUS_MORE_ENTRIES;
+ }
+ return NT_STATUS_OK;
+}
diff --git a/source4/lib/stream/packet.h b/source4/lib/stream/packet.h
new file mode 100644
index 0000000000..6d29264a28
--- /dev/null
+++ b/source4/lib/stream/packet.h
@@ -0,0 +1,47 @@
+/*
+ Unix SMB/CIFS mplementation.
+
+ helper layer for breaking up streams into discrete requests
+
+ Copyright (C) Andrew Tridgell 2005
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "lib/tls/tls.h"
+
+typedef NTSTATUS (*packet_full_request_fn_t)(void *private,
+ DATA_BLOB blob, size_t *packet_size);
+typedef NTSTATUS (*packet_callback_fn_t)(void *private, DATA_BLOB blob);
+typedef void (*packet_error_handler_fn_t)(void *private, NTSTATUS status);
+
+
+
+struct packet_context *packet_init(TALLOC_CTX *mem_ctx);
+void packet_set_callback(struct packet_context *pc, packet_callback_fn_t callback);
+void packet_set_error_handler(struct packet_context *pc, packet_error_handler_fn_t handler);
+void packet_set_private(struct packet_context *pc, void *private);
+void packet_set_full_request(struct packet_context *pc, packet_full_request_fn_t callback);
+void packet_set_tls(struct packet_context *pc, struct tls_context *tls);
+void packet_set_socket(struct packet_context *pc, struct socket_context *sock);
+void packet_set_event_context(struct packet_context *pc, struct event_context *ev);
+void packet_recv(struct packet_context *pc);
+
+/*
+ pre-canned handlers
+*/
+NTSTATUS packet_full_request_nbt(void *private, DATA_BLOB blob, size_t *packet_size);
+
generated by cgit (git 2.34.1) at 2024-12-16 02:30:15 +0000