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-rw-r--r--ctdb/common/sock_client.c334
1 files changed, 334 insertions, 0 deletions
diff --git a/ctdb/common/sock_client.c b/ctdb/common/sock_client.c
new file mode 100644
index 0000000..75f471f
--- /dev/null
+++ b/ctdb/common/sock_client.c
@@ -0,0 +1,334 @@
+/*
+ A client based on unix domain socket
+
+ Copyright (C) Amitay Isaacs 2017
+
+ 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 "replace.h"
+#include "system/filesys.h"
+#include "system/network.h"
+
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/debug.h"
+#include "lib/util/time.h"
+#include "lib/util/tevent_unix.h"
+
+#include "common/logging.h"
+#include "common/reqid.h"
+#include "common/comm.h"
+#include "common/sock_client.h"
+
+struct sock_client_context {
+ struct sock_client_proto_funcs *funcs;
+ void *private_data;
+
+ void (*disconnect_callback)(void *private_data);
+ void *disconnect_data;
+
+ int fd;
+ struct comm_context *comm;
+ struct reqid_context *idr;
+};
+
+/*
+ * connect to a unix domain socket
+ */
+
+static int socket_connect(const char *sockpath)
+{
+ struct sockaddr_un addr;
+ size_t len;
+ int fd, ret;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+
+ len = strlcpy(addr.sun_path, sockpath, sizeof(addr.sun_path));
+ if (len >= sizeof(addr.sun_path)) {
+ D_ERR("socket path too long: %s\n", sockpath);
+ return -1;
+ }
+
+ fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (fd == -1) {
+ D_ERR("socket create failed - %s\n", sockpath);
+ return -1;
+ }
+
+ ret = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
+ if (ret != 0) {
+ D_ERR("socket connect failed - %s\n", sockpath);
+ close(fd);
+ return -1;
+ }
+
+ return fd;
+}
+
+/*
+ * Socket client
+ */
+
+static int sock_client_context_destructor(struct sock_client_context *sockc);
+static void sock_client_read_handler(uint8_t *buf, size_t buflen,
+ void *private_data);
+static void sock_client_dead_handler(void *private_data);
+
+static void sock_client_msg_reply(struct sock_client_context *sockc,
+ uint8_t *buf, size_t buflen);
+
+int sock_client_setup(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+ const char *sockpath,
+ struct sock_client_proto_funcs *funcs,
+ void *private_data,
+ struct sock_client_context **result)
+{
+ struct sock_client_context *sockc;
+ int ret;
+
+ if (sockpath == NULL) {
+ return EINVAL;
+ }
+
+ if (funcs == NULL || funcs->request_push == NULL ||
+ funcs->reply_pull == NULL || funcs->reply_reqid == NULL) {
+ return EINVAL;
+ }
+
+ sockc = talloc_zero(mem_ctx, struct sock_client_context);
+ if (sockc == NULL) {
+ return ENOMEM;
+ }
+
+ sockc->funcs = funcs;
+ sockc->private_data = private_data;
+
+ sockc->fd = socket_connect(sockpath);
+ if (sockc->fd == -1) {
+ talloc_free(sockc);
+ return EIO;
+ }
+
+ ret = comm_setup(sockc, ev, sockc->fd,
+ sock_client_read_handler, sockc,
+ sock_client_dead_handler, sockc,
+ &sockc->comm);
+ if (ret != 0) {
+ D_ERR("comm_setup() failed, ret=%d\n", ret);
+ close(sockc->fd);
+ talloc_free(sockc);
+ return ret;
+ }
+
+ ret = reqid_init(sockc, INT_MAX-200, &sockc->idr);
+ if (ret != 0) {
+ D_ERR("reqid_init() failed, ret=%d\n", ret);
+ close(sockc->fd);
+ talloc_free(sockc);
+ return ret;
+ }
+
+ talloc_set_destructor(sockc, sock_client_context_destructor);
+
+ *result = sockc;
+ return 0;
+}
+
+static int sock_client_context_destructor(struct sock_client_context *sockc)
+{
+ TALLOC_FREE(sockc->comm);
+ if (sockc->fd != -1) {
+ close(sockc->fd);
+ sockc->fd = -1;
+ }
+ return 0;
+}
+
+
+static void sock_client_read_handler(uint8_t *buf, size_t buflen,
+ void *private_data)
+{
+ struct sock_client_context *sockc = talloc_get_type_abort(
+ private_data, struct sock_client_context);
+
+ sock_client_msg_reply(sockc, buf, buflen);
+}
+
+static void sock_client_dead_handler(void *private_data)
+{
+ struct sock_client_context *sockc = talloc_get_type_abort(
+ private_data, struct sock_client_context);
+
+ if (sockc->disconnect_callback != NULL) {
+ sockc->disconnect_callback(sockc->disconnect_data);
+ talloc_free(sockc);
+ return;
+ }
+
+ D_NOTICE("connection to daemon closed, exiting\n");
+ exit(1);
+}
+
+void sock_client_set_disconnect_callback(struct sock_client_context *sockc,
+ sock_client_callback_func_t callback,
+ void *private_data)
+{
+ sockc->disconnect_callback = callback;
+ sockc->disconnect_data = private_data;
+}
+
+
+struct sock_client_msg_state {
+ struct sock_client_context *sockc;
+ uint32_t reqid;
+ struct tevent_req *req;
+ void *reply;
+};
+
+static int sock_client_msg_state_destructor(
+ struct sock_client_msg_state *state);
+static void sock_client_msg_done(struct tevent_req *subreq);
+
+struct tevent_req *sock_client_msg_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct sock_client_context *sockc,
+ struct timeval timeout,
+ void *request)
+{
+ struct tevent_req *req, *subreq;
+ struct sock_client_msg_state *state;
+ uint8_t *buf;
+ size_t buflen;
+ int ret;
+
+ req = tevent_req_create(mem_ctx, &state, struct sock_client_msg_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ state->sockc = sockc;
+
+ state->reqid = reqid_new(sockc->idr, state);
+ if (state->reqid == REQID_INVALID) {
+ talloc_free(req);
+ return NULL;
+ }
+
+ state->req = req;
+
+ talloc_set_destructor(state, sock_client_msg_state_destructor);
+
+ ret = sockc->funcs->request_push(request, state->reqid, state,
+ &buf, &buflen, sockc->private_data);
+ if (ret != 0) {
+ tevent_req_error(req, ret);
+ return tevent_req_post(req, ev);
+ }
+
+ subreq = comm_write_send(state, ev, sockc->comm, buf, buflen);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, sock_client_msg_done, req);
+
+ if (! timeval_is_zero(&timeout)) {
+ if (!tevent_req_set_endtime(req, ev, timeout)) {
+ return tevent_req_post(req, ev);
+ }
+ }
+
+ return req;
+}
+
+static int sock_client_msg_state_destructor(
+ struct sock_client_msg_state *state)
+{
+ reqid_remove(state->sockc->idr, state->reqid);
+ return 0;
+}
+
+static void sock_client_msg_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ int ret;
+ bool status;
+
+ status = comm_write_recv(subreq, &ret);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ /* wait for the reply or timeout */
+}
+
+static void sock_client_msg_reply(struct sock_client_context *sockc,
+ uint8_t *buf, size_t buflen)
+{
+ struct sock_client_msg_state *state;
+ uint32_t reqid;
+ int ret;
+
+ ret = sockc->funcs->reply_reqid(buf, buflen, &reqid,
+ sockc->private_data);
+ if (ret != 0) {
+ D_WARNING("Invalid packet received, ret=%d\n", ret);
+ return;
+ }
+
+ state = reqid_find(sockc->idr, reqid, struct sock_client_msg_state);
+ if (state == NULL) {
+ return;
+ }
+
+ if (reqid != state->reqid) {
+ return;
+ }
+
+ ret = sockc->funcs->reply_pull(buf, buflen, state, &state->reply,
+ sockc->private_data);
+ if (ret != 0) {
+ tevent_req_error(state->req, ret);
+ return;
+ }
+
+ tevent_req_done(state->req);
+}
+
+bool sock_client_msg_recv(struct tevent_req *req, int *perr,
+ TALLOC_CTX *mem_ctx, void *reply)
+{
+ struct sock_client_msg_state *state = tevent_req_data(
+ req, struct sock_client_msg_state);
+ int ret;
+
+ if (tevent_req_is_unix_error(req, &ret)) {
+ if (perr != NULL) {
+ *perr = ret;
+ }
+ return false;
+ }
+
+ if (reply != NULL) {
+ *(void **)reply = talloc_steal(mem_ctx, state->reply);
+ }
+
+ return true;
+}