lib/tsocket: add tsocket_recvfrom_send/recv()

metze

lib/tsocket/config.mk

@@ -4,7 +4,8 @@ PRIVATE_DEPENDENCIES = LIBTALLOC LIBTEVENT LIBREPLACE_NETWORK
 LIBTSOCKET_OBJ_FILES = $(addprefix ../lib/tsocket/, \
 					tsocket.o \
 					tsocket_helpers.o \
-					tsocket_bsd.o)
+					tsocket_bsd.o \
+					tsocket_recvfrom.o)
 
 PUBLIC_HEADERS += $(addprefix ../lib/tsocket/, \
 				 tsocket.h\

lib/tsocket/tsocket.h

@@ -124,7 +124,6 @@ int _tsocket_address_create_socket(const struct tsocket_address *addr,
  * BSD sockets: inet, inet6 and unix
  */
 
-
 int _tsocket_address_inet_from_strings(TALLOC_CTX *mem_ctx,
 				       const char *fam,
 				       const char *addr,
@@ -161,5 +160,17 @@ int _tsocket_context_bsd_wrap_existing(TALLOC_CTX *mem_ctx,
 	_tsocket_context_bsd_wrap_existing(mem_ctx, fd, cod, _sock, \
 					   __location__)
 
+/*
+ * Async helpers
+ */
+
+struct tevent_req *tsocket_recvfrom_send(struct tsocket_context *sock,
+					 TALLOC_CTX *mem_ctx);
+ssize_t tsocket_recvfrom_recv(struct tevent_req *req,
+			      int *perrno,
+			      TALLOC_CTX *mem_ctx,
+			      uint8_t **buf,
+			      struct tsocket_address **src);
+
 #endif /* _TSOCKET_H */
 

lib/tsocket/tsocket_recvfrom.c

@@ -0,0 +1,164 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Copyright (C) Stefan Metzmacher 2009
+
+     ** NOTE! The following LGPL license applies to the tevent
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/network.h"
+#include "tsocket.h"
+#include "tsocket_internal.h"
+
+struct tsocket_recvfrom_state {
+	/* this structs are owned by the caller */
+	struct {
+		struct tsocket_context *sock;
+	} caller;
+
+	uint8_t *buf;
+	size_t len;
+	struct tsocket_address *src;
+};
+
+static int tsocket_recvfrom_state_destructor(struct tsocket_recvfrom_state *state)
+{
+	if (state->caller.sock) {
+		tsocket_set_readable_handler(state->caller.sock, NULL, NULL);
+	}
+	ZERO_STRUCT(state->caller);
+
+	return 0;
+}
+
+static void tsocket_recvfrom_handler(struct tsocket_context *sock,
+				     void *private_data);
+
+struct tevent_req *tsocket_recvfrom_send(struct tsocket_context *sock,
+					 TALLOC_CTX *mem_ctx)
+{
+	struct tevent_req *req;
+	struct tsocket_recvfrom_state *state;
+	int ret;
+	int err;
+	bool dummy;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct tsocket_recvfrom_state);
+	if (!req) {
+		return NULL;
+	}
+
+	state->caller.sock	= sock;
+	state->buf		= NULL;
+	state->len		= 0;
+	state->src		= NULL;
+
+	talloc_set_destructor(state, tsocket_recvfrom_state_destructor);
+
+	ret = tsocket_set_readable_handler(sock,
+					   tsocket_recvfrom_handler,
+					   req);
+	err = tsocket_error_from_errno(ret, errno, &dummy);
+	if (tevent_req_error(req, err)) {
+		goto post;
+	}
+
+	return req;
+
+ post:
+	return tevent_req_post(req, sock->event.ctx);
+}
+
+static void tsocket_recvfrom_handler(struct tsocket_context *sock,
+				     void *private_data)
+{
+	struct tevent_req *req = talloc_get_type(private_data,
+				 struct tevent_req);
+	struct tsocket_recvfrom_state *state = tevent_req_data(req,
+					       struct tsocket_recvfrom_state);
+	ssize_t ret;
+	int err;
+	bool retry;
+
+	ret = tsocket_pending(state->caller.sock);
+	if (ret == 0) {
+		/* retry later */
+		return;
+	}
+	err = tsocket_error_from_errno(ret, errno, &retry);
+	if (retry) {
+		/* retry later */
+		return;
+	}
+	if (tevent_req_error(req, err)) {
+		return;
+	}
+
+	state->buf = talloc_array(state, uint8_t, ret);
+	if (tevent_req_nomem(state->buf, req)) {
+		return;
+	}
+	state->len = ret;
+
+	ret = tsocket_recvfrom(state->caller.sock,
+			       state->buf,
+			       state->len,
+			       state,
+			       &state->src);
+	err = tsocket_error_from_errno(ret, errno, &retry);
+	if (retry) {
+		/* retry later */
+		return;
+	}
+	if (tevent_req_error(req, err)) {
+		return;
+	}
+
+	if (ret != state->len) {
+		tevent_req_error(req, EIO);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+ssize_t tsocket_recvfrom_recv(struct tevent_req *req,
+			      int *perrno,
+			      TALLOC_CTX *mem_ctx,
+			      uint8_t **buf,
+			      struct tsocket_address **src)
+{
+	struct tsocket_recvfrom_state *state = tevent_req_data(req,
+					       struct tsocket_recvfrom_state);
+	ssize_t ret;
+
+	ret = tsocket_simple_int_recv(req, perrno);
+	if (ret == 0) {
+		*buf = talloc_move(mem_ctx, &state->buf);
+		ret = state->len;
+		if (src) {
+			*src = talloc_move(mem_ctx, &state->src);
+		}
+	}
+
+	tevent_req_received(req);
+	return ret;
+}
+