nsswitch: make wb_reqtrans a common subsystem.

Guenther

1 files changed, 446 insertions, 0 deletions

diff --git a/nsswitch/wb_reqtrans.c b/nsswitch/wb_reqtrans.c
new file mode 100644
index 0000000000..779ef52a92
--- /dev/null
+++ b/nsswitch/wb_reqtrans.c
@@ -0,0 +1,446 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Async transfer of winbindd_request and _response structs
+
+   Copyright (C) Volker Lendecke 2008
+
+     ** NOTE! The following LGPL license applies to the wbclient
+     ** 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/filesys.h"
+#include "system/network.h"
+#include <talloc.h>
+#include <tevent.h>
+#include "lib/async_req/async_sock.h"
+#include "lib/util/tevent_unix.h"
+#include "nsswitch/winbind_struct_protocol.h"
+#include "nsswitch/libwbclient/wbclient.h"
+#include "nsswitch/wb_reqtrans.h"
+
+/* can't use DEBUG here... */
+#define DEBUG(a,b)
+
+struct req_read_state {
+	struct winbindd_request *wb_req;
+	size_t max_extra_data;
+	ssize_t ret;
+};
+
+static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data);
+static void wb_req_read_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
+				    struct tevent_context *ev,
+				    int fd, size_t max_extra_data)
+{
+	struct tevent_req *req, *subreq;
+	struct req_read_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct req_read_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->max_extra_data = max_extra_data;
+
+	subreq = read_packet_send(state, ev, fd, 4, wb_req_more, state);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_req_read_done, req);
+	return req;
+}
+
+static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data)
+{
+	struct req_read_state *state = talloc_get_type_abort(
+		private_data, struct req_read_state);
+	struct winbindd_request *req = (struct winbindd_request *)buf;
+
+	if (buflen == 4) {
+		if (req->length != sizeof(struct winbindd_request)) {
+			DEBUG(0, ("wb_req_read_len: Invalid request size "
+				  "received: %d (expected %d)\n",
+				  (int)req->length,
+				  (int)sizeof(struct winbindd_request)));
+			return -1;
+		}
+		return sizeof(struct winbindd_request) - 4;
+	}
+
+	if (buflen > sizeof(struct winbindd_request)) {
+		/* We've been here, we're done */
+		return 0;
+	}
+
+	if ((state->max_extra_data != 0)
+	    && (req->extra_len > state->max_extra_data)) {
+		DEBUG(3, ("Got request with %d bytes extra data on "
+			  "unprivileged socket\n", (int)req->extra_len));
+		return -1;
+	}
+
+	return req->extra_len;
+}
+
+static void wb_req_read_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct req_read_state *state = tevent_req_data(
+		req, struct req_read_state);
+	int err;
+	uint8_t *buf;
+
+	state->ret = read_packet_recv(subreq, state, &buf, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+
+	state->wb_req = (struct winbindd_request *)buf;
+
+	if (state->wb_req->extra_len != 0) {
+		state->wb_req->extra_data.data =
+			(char *)buf + sizeof(struct winbindd_request);
+	} else {
+		state->wb_req->extra_data.data = NULL;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_req_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 struct winbindd_request **preq, int *err)
+{
+	struct req_read_state *state = tevent_req_data(
+		req, struct req_read_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*preq = talloc_move(mem_ctx, &state->wb_req);
+	return state->ret;
+}
+
+struct req_write_state {
+	struct iovec iov[2];
+	ssize_t ret;
+};
+
+static void wb_req_write_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct tevent_queue *queue, int fd,
+				     struct winbindd_request *wb_req)
+{
+	struct tevent_req *req, *subreq;
+	struct req_write_state *state;
+	int count = 1;
+
+	req = tevent_req_create(mem_ctx, &state, struct req_write_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->iov[0].iov_base = (void *)wb_req;
+	state->iov[0].iov_len = sizeof(struct winbindd_request);
+
+	if (wb_req->extra_len != 0) {
+		state->iov[1].iov_base = (void *)wb_req->extra_data.data;
+		state->iov[1].iov_len = wb_req->extra_len;
+		count = 2;
+	}
+
+	subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_req_write_done, req);
+	return req;
+}
+
+static void wb_req_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct req_write_state *state = tevent_req_data(
+		req, struct req_write_state);
+	int err;
+
+	state->ret = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret < 0) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_req_write_recv(struct tevent_req *req, int *err)
+{
+	struct req_write_state *state = tevent_req_data(
+		req, struct req_write_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	return state->ret;
+}
+
+struct resp_read_state {
+	struct winbindd_response *wb_resp;
+	ssize_t ret;
+};
+
+static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data);
+static void wb_resp_read_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev, int fd)
+{
+	struct tevent_req *req, *subreq;
+	struct resp_read_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct resp_read_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	subreq = read_packet_send(state, ev, fd, 4, wb_resp_more, state);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_resp_read_done, req);
+	return req;
+}
+
+static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data)
+{
+	struct winbindd_response *resp = (struct winbindd_response *)buf;
+
+	if (buflen == 4) {
+		if (resp->length < sizeof(struct winbindd_response)) {
+			DEBUG(0, ("wb_resp_read_len: Invalid response size "
+				  "received: %d (expected at least%d)\n",
+				  (int)resp->length,
+				  (int)sizeof(struct winbindd_response)));
+			return -1;
+		}
+	}
+	return resp->length - buflen;
+}
+
+static void wb_resp_read_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct resp_read_state *state = tevent_req_data(
+		req, struct resp_read_state);
+	uint8_t *buf;
+	int err;
+
+	state->ret = read_packet_recv(subreq, state, &buf, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+
+	state->wb_resp = (struct winbindd_response *)buf;
+
+	if (state->wb_resp->length > sizeof(struct winbindd_response)) {
+		state->wb_resp->extra_data.data =
+			(char *)buf + sizeof(struct winbindd_response);
+	} else {
+		state->wb_resp->extra_data.data = NULL;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_resp_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			  struct winbindd_response **presp, int *err)
+{
+	struct resp_read_state *state = tevent_req_data(
+		req, struct resp_read_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*presp = talloc_move(mem_ctx, &state->wb_resp);
+	return state->ret;
+}
+
+struct resp_write_state {
+	struct iovec iov[2];
+	ssize_t ret;
+};
+
+static void wb_resp_write_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct tevent_queue *queue, int fd,
+				      struct winbindd_response *wb_resp)
+{
+	struct tevent_req *req, *subreq;
+	struct resp_write_state *state;
+	int count = 1;
+
+	req = tevent_req_create(mem_ctx, &state, struct resp_write_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->iov[0].iov_base = (void *)wb_resp;
+	state->iov[0].iov_len = sizeof(struct winbindd_response);
+
+	if (wb_resp->length > sizeof(struct winbindd_response)) {
+		state->iov[1].iov_base = (void *)wb_resp->extra_data.data;
+		state->iov[1].iov_len =
+			wb_resp->length - sizeof(struct winbindd_response);
+		count = 2;
+	}
+
+	subreq = writev_send(state, ev, queue, fd, true, state->iov, count);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_resp_write_done, req);
+	return req;
+}
+
+static void wb_resp_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct resp_write_state *state = tevent_req_data(
+		req, struct resp_write_state);
+	int err;
+
+	state->ret = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (state->ret < 0) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+ssize_t wb_resp_write_recv(struct tevent_req *req, int *err)
+{
+	struct resp_write_state *state = tevent_req_data(
+		req, struct resp_write_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	return state->ret;
+}
+
+struct wb_simple_trans_state {
+	struct tevent_context *ev;
+	int fd;
+	struct winbindd_response *wb_resp;
+};
+
+static void wb_simple_trans_write_done(struct tevent_req *subreq);
+static void wb_simple_trans_read_done(struct tevent_req *subreq);
+
+struct tevent_req *wb_simple_trans_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct tevent_queue *queue, int fd,
+					struct winbindd_request *wb_req)
+{
+	struct tevent_req *req, *subreq;
+	struct wb_simple_trans_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct wb_simple_trans_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	wb_req->length = sizeof(struct winbindd_request);
+
+	state->ev = ev;
+	state->fd = fd;
+
+	subreq = wb_req_write_send(state, ev, queue, fd, wb_req);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, wb_simple_trans_write_done, req);
+
+	return req;
+}
+
+static void wb_simple_trans_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_simple_trans_state *state = tevent_req_data(
+		req, struct wb_simple_trans_state);
+	ssize_t ret;
+	int err;
+
+	ret = wb_req_write_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	subreq = wb_resp_read_send(state, state->ev, state->fd);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, wb_simple_trans_read_done, req);
+}
+
+static void wb_simple_trans_read_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct wb_simple_trans_state *state = tevent_req_data(
+		req, struct wb_simple_trans_state);
+	ssize_t ret;
+	int err;
+
+	ret = wb_resp_read_recv(subreq, state, &state->wb_resp, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+int wb_simple_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			 struct winbindd_response **presponse, int *err)
+{
+	struct wb_simple_trans_state *state = tevent_req_data(
+		req, struct wb_simple_trans_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*presponse = talloc_move(mem_ctx, &state->wb_resp);
+	return 0;
+}