s3: Add a second ctdb connect library

The existing one is not async at all.

1 files changed, 603 insertions, 0 deletions

diff --git a/source3/lib/ctdb_conn.c b/source3/lib/ctdb_conn.c
new file mode 100644
index 0000000000..a96615fb6c
--- /dev/null
+++ b/source3/lib/ctdb_conn.c
@@ -0,0 +1,603 @@
+/*
+   Unix SMB/CIFS implementation.
+   Samba3 ctdb connection handling
+   Copyright (C) Volker Lendecke 2012
+
+   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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "lib/util/tevent_unix.h"
+#include "ctdb_conn.h"
+
+#ifdef CLUSTER_SUPPORT
+
+#include "lib/async_req/async_sock.h"
+
+struct ctdb_conn {
+	int fd;
+	struct tevent_queue *outqueue;
+};
+
+struct ctdb_conn_init_state {
+	struct sockaddr_un addr;
+	struct ctdb_conn *conn;
+};
+
+static void ctdb_conn_init_done(struct tevent_req *subreq);
+static int ctdb_conn_destructor(struct ctdb_conn *conn);
+
+struct tevent_req *ctdb_conn_init_send(TALLOC_CTX *mem_ctx,
+				       struct tevent_context *ev,
+				       const char *sock)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_conn_init_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct ctdb_conn_init_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (!lp_clustering()) {
+		tevent_req_error(req, ENOSYS);
+		return tevent_req_post(req, ev);
+	}
+
+	if (strlen(sock) >= sizeof(state->addr.sun_path)) {
+		tevent_req_error(req, ENAMETOOLONG);
+		return tevent_req_post(req, ev);
+	}
+
+	state->conn = talloc(state, struct ctdb_conn);
+	if (tevent_req_nomem(state->conn, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->conn->outqueue = tevent_queue_create(
+		state->conn, "ctdb outqueue");
+	if (tevent_req_nomem(state->conn->outqueue, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	state->conn->fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (state->conn->fd == -1) {
+		tevent_req_error(req, errno);
+		return tevent_req_post(req, ev);
+	}
+	talloc_set_destructor(state->conn, ctdb_conn_destructor);
+
+	state->addr.sun_family = AF_UNIX;
+	strncpy(state->addr.sun_path, sock, sizeof(state->addr.sun_path));
+
+	subreq = async_connect_send(state, ev, state->conn->fd,
+				    (struct sockaddr *)&state->addr,
+				    sizeof(state->addr));
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_conn_init_done, req);
+	return req;
+}
+
+static int ctdb_conn_destructor(struct ctdb_conn *c)
+{
+	if (c->fd != -1) {
+		close(c->fd);
+		c->fd = -1;
+	}
+	return 0;
+}
+
+static void ctdb_conn_init_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	int ret, err;
+
+	ret = async_connect_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (ret == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+int ctdb_conn_init_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			struct ctdb_conn **pconn)
+{
+	struct ctdb_conn_init_state *state = tevent_req_data(
+		req, struct ctdb_conn_init_state);
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		return err;
+	}
+	*pconn = talloc_move(mem_ctx, &state->conn);
+
+	return 0;
+}
+
+struct ctdb_conn_control_state {
+	struct tevent_context *ev;
+	struct ctdb_conn *conn;
+	struct ctdb_req_control req;
+	struct iovec iov[2];
+	struct ctdb_reply_control *reply;
+};
+
+static void ctdb_conn_control_written(struct tevent_req *subreq);
+static void ctdb_conn_control_done(struct tevent_req *subreq);
+static ssize_t ctdb_packet_more(uint8_t *buf, size_t buflen, void *p);
+
+struct tevent_req *ctdb_conn_control_send(TALLOC_CTX *mem_ctx,
+					  struct tevent_context *ev,
+					  struct ctdb_conn *conn,
+					  uint32_t vnn, uint32_t opcode,
+					  uint64_t srvid, uint32_t flags,
+					  uint8_t *data, size_t datalen)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_conn_control_state *state;
+	struct ctdb_req_header *hdr;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_conn_control_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->conn = conn;
+
+	hdr = &state->req.hdr;
+	hdr->length = offsetof(struct ctdb_req_control, data) + datalen;
+	hdr->ctdb_magic    = CTDB_MAGIC;
+	hdr->ctdb_version  = CTDB_VERSION;
+	hdr->operation     = CTDB_REQ_CONTROL;
+	hdr->reqid         = 1; /* FIXME */
+	hdr->destnode      = vnn;
+	state->req.opcode  = opcode;
+	state->req.srvid   = srvid;
+	state->req.datalen = datalen;
+	state->req.flags   = flags;
+
+	state->iov[0].iov_base = &state->req;
+	state->iov[0].iov_len = offsetof(struct ctdb_req_control, data);
+	state->iov[1].iov_base = data;
+	state->iov[1].iov_len = datalen;
+
+	subreq = writev_send(state, ev, conn->outqueue, conn->fd, false,
+			     state->iov, 2);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_conn_control_written, req);
+	return req;
+}
+
+static void ctdb_conn_control_written(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_conn_control_state *state = tevent_req_data(
+		req, struct ctdb_conn_control_state);
+	ssize_t written;
+	int err;
+
+	written = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (written == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	subreq = read_packet_send(
+		state, state->ev, state->conn->fd, sizeof(uint32_t),
+		ctdb_packet_more, NULL);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, ctdb_conn_control_done, req);
+}
+
+static ssize_t ctdb_packet_more(uint8_t *buf, size_t buflen, void *p)
+{
+	uint32_t len;
+
+	if (buflen > sizeof(uint32_t)) {
+		/* Been here, done */
+		return 0;
+	}
+	memcpy(&len, buf, sizeof(len));
+	return (len - sizeof(uint32_t));
+}
+
+static void ctdb_conn_control_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_conn_control_state *state = tevent_req_data(
+		req, struct ctdb_conn_control_state);
+	ssize_t nread;
+	uint8_t *buf;
+	int err;
+
+	nread = read_packet_recv(subreq, state, &buf, &err);
+	TALLOC_FREE(subreq);
+	if (nread == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	state->reply = (struct ctdb_reply_control *)buf;
+	tevent_req_done(req);
+}
+
+int ctdb_conn_control_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			   struct ctdb_reply_control **preply)
+{
+	struct ctdb_conn_control_state *state = tevent_req_data(
+		req, struct ctdb_conn_control_state);
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		return err;
+	}
+	if (preply != NULL) {
+		*preply = talloc_move(mem_ctx, &state->reply);
+	}
+	return 0;
+}
+
+struct ctdb_conn_msg_write_state {
+	struct ctdb_req_message ctdb_msg;
+	struct iovec iov[2];
+};
+
+static void ctdb_conn_msg_write_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_conn_msg_write_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct ctdb_conn *conn,
+					    uint32_t vnn, uint64_t srvid,
+					    uint8_t *msg, size_t msg_len)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_conn_msg_write_state *state;
+	struct ctdb_req_header *h;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_conn_msg_write_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	h = &state->ctdb_msg.hdr;
+
+	h->length = offsetof(struct ctdb_req_message, data) + msg_len;
+	h->ctdb_magic = CTDB_MAGIC;
+	h->ctdb_version = CTDB_VERSION;
+	h->generation = 1;
+	h->operation  = CTDB_REQ_MESSAGE;
+	h->destnode   = vnn;
+	h->srcnode    = CTDB_CURRENT_NODE;
+	h->reqid      = 0;
+	state->ctdb_msg.srvid   = srvid;
+	state->ctdb_msg.datalen = msg_len;
+
+	state->iov[0].iov_base = &state->ctdb_msg;
+	state->iov[0].iov_len = offsetof(struct ctdb_req_message, data);
+	state->iov[1].iov_base = msg;
+	state->iov[1].iov_len = msg_len;
+
+	subreq = writev_send(state, ev, conn->outqueue, conn->fd, false,
+			     state->iov, 2);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_conn_msg_write_done, req);
+	return req;
+}
+
+static void ctdb_conn_msg_write_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	ssize_t written;
+	int err;
+
+	written = writev_recv(subreq, &err);
+	TALLOC_FREE(subreq);
+	if (written == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	tevent_req_done(req);
+}
+
+int ctdb_conn_msg_write_recv(struct tevent_req *req)
+{
+	int err;
+	if (tevent_req_is_unix_error(req, &err)) {
+		return err;
+	}
+	return 0;
+}
+
+struct ctdb_msg_channel {
+	struct ctdb_conn *conn;
+};
+
+struct ctdb_msg_channel_init_state {
+	struct tevent_context *ev;
+	struct ctdb_conn *conn;
+	uint64_t srvid;
+	struct ctdb_msg_channel *channel;
+};
+
+static void ctdb_msg_channel_init_connected(struct tevent_req *subreq);
+static void ctdb_msg_channel_init_registered_srvid(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_msg_channel_init_send(
+	TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+	const char *sock, uint64_t srvid)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_msg_channel_init_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_msg_channel_init_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->srvid = srvid;
+
+	subreq = ctdb_conn_init_send(state, ev, sock);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_msg_channel_init_connected, req);
+	return req;
+}
+
+static void ctdb_msg_channel_init_connected(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_msg_channel_init_state *state = tevent_req_data(
+		req, struct ctdb_msg_channel_init_state);
+	int ret;
+
+	ret = ctdb_conn_init_recv(subreq, state, &state->conn);
+	TALLOC_FREE(subreq);
+	if (tevent_req_error(req, ret)) {
+		return;
+	}
+	subreq = ctdb_conn_control_send(state, state->ev, state->conn,
+					CTDB_CURRENT_NODE,
+					CTDB_CONTROL_REGISTER_SRVID,
+					state->srvid, 0, NULL, 0);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(
+		subreq, ctdb_msg_channel_init_registered_srvid,	req);
+}
+
+static void ctdb_msg_channel_init_registered_srvid(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_msg_channel_init_state *state = tevent_req_data(
+		req, struct ctdb_msg_channel_init_state);
+	struct ctdb_reply_control *reply;
+	int ret;
+
+	ret = ctdb_conn_control_recv(subreq, talloc_tos(), &reply);
+	TALLOC_FREE(subreq);
+	if (tevent_req_error(req, ret)) {
+		return;
+	}
+	if (reply->status != 0) {
+		tevent_req_error(req, EIO);
+		return;
+	}
+	state->channel = talloc(state, struct ctdb_msg_channel);
+	if (tevent_req_nomem(state->channel, req)) {
+		return;
+	}
+	state->channel->conn = talloc_move(state->channel, &state->conn);
+	tevent_req_done(req);
+}
+
+int ctdb_msg_channel_init_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			       struct ctdb_msg_channel **pchannel)
+{
+	struct ctdb_msg_channel_init_state *state = tevent_req_data(
+		req, struct ctdb_msg_channel_init_state);
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		return err;
+	}
+	*pchannel = talloc_move(mem_ctx, &state->channel);
+	return 0;
+}
+
+struct ctdb_msg_read_state {
+	size_t buflen;
+	uint8_t *buf;
+};
+
+static void ctdb_msg_channel_got_msg(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_msg_read_send(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct ctdb_msg_channel *channel)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_msg_read_state *state;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_msg_read_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	subreq = read_packet_send(state, ev, channel->conn->fd,
+		sizeof(uint32_t), ctdb_packet_more, NULL);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_msg_channel_got_msg, req);
+	return req;
+}
+
+static void ctdb_msg_channel_got_msg(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_msg_read_state *state = tevent_req_data(
+		req, struct ctdb_msg_read_state);
+	ssize_t nread;
+	uint8_t *buf;
+	int err;
+
+	nread = read_packet_recv(subreq, state, &buf, &err);
+	if (nread == -1) {
+		tevent_req_error(req, err);
+		return;
+	}
+	state->buflen = nread;
+	state->buf = buf;
+	tevent_req_done(req);
+}
+
+int ctdb_msg_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+		       uint8_t **pmsg, size_t *pmsg_len)
+{
+	struct ctdb_msg_read_state *state = tevent_req_data(
+		req, struct ctdb_msg_read_state);
+	struct ctdb_req_header *hdr;
+	struct ctdb_req_message *msg;
+	uint8_t *buf;
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		return err;
+	}
+
+	hdr = (struct ctdb_req_header *)state->buf;
+	if (hdr->length != state->buflen) {
+		DEBUG(10, ("Got invalid header length\n"));
+		return EIO;
+	}
+	if (hdr->operation != CTDB_REQ_MESSAGE) {
+		DEBUG(10, ("Expected %d (CTDB_REQ_MESSAGE), got %d\n",
+			   CTDB_REQ_MESSAGE, (int)hdr->operation));
+		return EIO;
+	}
+	if (hdr->length < offsetof(struct ctdb_req_message, data)) {
+		DEBUG(10, ("Got short msg, len=%d\n", (int)hdr->length));
+		return EIO;
+	}
+
+	msg = (struct ctdb_req_message *)hdr;
+	if (msg->datalen >
+	    hdr->length - offsetof(struct ctdb_req_message, data)) {
+		DEBUG(10, ("Got invalid datalen %d\n", (int)msg->datalen));
+		return EIO;
+	}
+
+	buf = (uint8_t *)talloc_memdup(mem_ctx, msg->data, msg->datalen);
+	if (buf == NULL) {
+		return ENOMEM;
+	}
+	*pmsg = buf;
+	*pmsg_len = msg->datalen;
+	return 0;
+}
+
+#else
+
+struct dummy_state {
+	uint8_t dummy;
+};
+
+static struct tevent_req *dummy_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev)
+{
+	struct tevent_req *req;
+	struct dummy_state *state;
+	req = tevent_req_create(mem_ctx, &state, struct dummy_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+struct tevent_req *ctdb_conn_init_send(TALLOC_CTX *mem_ctx,
+				       struct tevent_context *ev,
+				       const char *sock)
+{
+	return dummy_send(mem_ctx, ev);
+}
+
+int ctdb_conn_init_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			struct ctdb_conn **pconn)
+{
+	return ENOSYS;
+}
+
+struct tevent_req *ctdb_conn_msg_write_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct ctdb_conn *conn,
+					    uint32_t vnn, uint64_t srvid,
+					    uint8_t *msg, size_t msg_len)
+{
+	return dummy_send(mem_ctx, ev);
+}
+
+int ctdb_conn_msg_write_recv(struct tevent_req *req)
+{
+	return ENOSYS;
+}
+
+struct tevent_req *ctdb_msg_channel_init_send(
+	TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+	const char *sock, uint64_t srvid)
+{
+	return dummy_send(mem_ctx, ev);
+}
+
+int ctdb_msg_channel_init_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+			       struct ctdb_msg_channel **pchannel)
+{
+	return ENOSYS;
+}
+
+struct tevent_req *ctdb_msg_read_send(TALLOC_CTX *mem_ctx,
+				      struct tevent_context *ev,
+				      struct ctdb_msg_channel *channel)
+{
+	return dummy_send(mem_ctx, ev);
+}
+
+int ctdb_msg_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+		       uint8_t **pmsg, size_t *pmsg_len)
+{
+	return ENOSYS;
+}
+
+#endif