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-rw-r--r--ctdb/common/sock_daemon.c1100
1 files changed, 1100 insertions, 0 deletions
diff --git a/ctdb/common/sock_daemon.c b/ctdb/common/sock_daemon.c
new file mode 100644
index 0000000..e31a364
--- /dev/null
+++ b/ctdb/common/sock_daemon.c
@@ -0,0 +1,1100 @@
+/*
+ A server based on unix domain socket
+
+ Copyright (C) Amitay Isaacs 2016
+
+ 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 "system/wait.h"
+
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/async_req/async_sock.h"
+#include "lib/util/debug.h"
+#include "lib/util/blocking.h"
+#include "lib/util/dlinklist.h"
+#include "lib/util/tevent_unix.h"
+#include "lib/util/become_daemon.h"
+#include "lib/util/sys_rw.h"
+
+#include "common/logging.h"
+#include "common/reqid.h"
+#include "common/comm.h"
+#include "common/pidfile.h"
+#include "common/system.h"
+#include "common/sock_daemon.h"
+
+struct sock_socket {
+ struct sock_socket *prev, *next;
+
+ const char *sockpath;
+ struct sock_socket_funcs *funcs;
+ void *private_data;
+
+ int fd;
+ struct tevent_req *req;
+};
+
+struct sock_client {
+ struct sock_client *prev, *next;
+
+ struct tevent_req *req;
+ struct sock_client_context *client_ctx;
+};
+
+struct sock_client_context {
+ struct tevent_context *ev;
+ struct sock_socket *sock;
+ int fd;
+ struct comm_context *comm;
+
+ struct sock_client *client;
+};
+
+struct sock_daemon_context {
+ struct sock_daemon_funcs *funcs;
+ void *private_data;
+
+ struct pidfile_context *pid_ctx;
+ struct sock_socket *socket_list;
+ int startup_fd;
+};
+
+/*
+ * Process a single client
+ */
+
+static void sock_client_read_handler(uint8_t *buf, size_t buflen,
+ void *private_data);
+static void sock_client_read_done(struct tevent_req *subreq);
+static void sock_client_dead_handler(void *private_data);
+static int sock_client_context_destructor(
+ struct sock_client_context *client_ctx);
+
+static int sock_client_context_init(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct sock_socket *sock,
+ int client_fd,
+ struct sock_client *client,
+ struct sock_client_context **result)
+{
+ struct sock_client_context *client_ctx;
+ int ret;
+
+ client_ctx = talloc_zero(mem_ctx, struct sock_client_context);
+ if (client_ctx == NULL) {
+ return ENOMEM;
+ }
+
+ client_ctx->ev = ev;
+ client_ctx->sock = sock;
+ client_ctx->fd = client_fd;
+ client_ctx->client = client;
+
+ ret = comm_setup(client_ctx, ev, client_fd,
+ sock_client_read_handler, client_ctx,
+ sock_client_dead_handler, client_ctx,
+ &client_ctx->comm);
+ if (ret != 0) {
+ talloc_free(client_ctx);
+ return ret;
+ }
+
+ if (sock->funcs->connect != NULL) {
+ pid_t pid;
+ bool status;
+
+ (void) ctdb_get_peer_pid(client_fd, &pid);
+
+ status = sock->funcs->connect(client_ctx,
+ pid,
+ sock->private_data);
+ if (! status) {
+ talloc_free(client_ctx);
+ close(client_fd);
+ return 0;
+ }
+ }
+
+ talloc_set_destructor(client_ctx, sock_client_context_destructor);
+
+ *result = client_ctx;
+ return 0;
+}
+
+static void sock_client_read_handler(uint8_t *buf, size_t buflen,
+ void *private_data)
+{
+ struct sock_client_context *client_ctx = talloc_get_type_abort(
+ private_data, struct sock_client_context);
+ struct sock_socket *sock = client_ctx->sock;
+ struct tevent_req *subreq;
+
+ subreq = sock->funcs->read_send(client_ctx, client_ctx->ev,
+ client_ctx, buf, buflen,
+ sock->private_data);
+ if (subreq == NULL) {
+ talloc_free(client_ctx);
+ return;
+ }
+ tevent_req_set_callback(subreq, sock_client_read_done, client_ctx);
+}
+
+static void sock_client_read_done(struct tevent_req *subreq)
+{
+ struct sock_client_context *client_ctx = tevent_req_callback_data(
+ subreq, struct sock_client_context);
+ struct sock_socket *sock = client_ctx->sock;
+ int ret;
+ bool status;
+
+ status = sock->funcs->read_recv(subreq, &ret);
+ if (! status) {
+ D_ERR("client read failed with ret=%d\n", ret);
+ talloc_free(client_ctx);
+ }
+}
+
+static void sock_client_dead_handler(void *private_data)
+{
+ struct sock_client_context *client_ctx = talloc_get_type_abort(
+ private_data, struct sock_client_context);
+ struct sock_socket *sock = client_ctx->sock;
+
+ if (sock->funcs->disconnect != NULL) {
+ sock->funcs->disconnect(client_ctx, sock->private_data);
+ }
+
+ talloc_free(client_ctx);
+}
+
+static int sock_client_context_destructor(
+ struct sock_client_context *client_ctx)
+{
+ TALLOC_FREE(client_ctx->client);
+ TALLOC_FREE(client_ctx->comm);
+ if (client_ctx->fd != -1) {
+ close(client_ctx->fd);
+ client_ctx->fd = -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Process a single listening socket
+ */
+
+static int socket_setup(const char *sockpath, bool remove_before_use)
+{
+ struct sockaddr_un addr;
+ size_t len;
+ int ret, fd;
+
+ 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 = set_blocking(fd, false);
+ if (ret != 0) {
+ D_ERR("socket set nonblocking failed - %s\n", sockpath);
+ close(fd);
+ return -1;
+ }
+
+ if (remove_before_use) {
+ unlink(sockpath);
+ }
+
+ ret = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
+ if (ret != 0) {
+ D_ERR("socket bind failed - %s\n", sockpath);
+ close(fd);
+ return -1;
+ }
+
+ ret = listen(fd, 10);
+ if (ret != 0) {
+ D_ERR("socket listen failed - %s\n", sockpath);
+ close(fd);
+ return -1;
+ }
+
+ D_NOTICE("listening on %s\n", sockpath);
+
+ return fd;
+}
+
+static int sock_socket_destructor(struct sock_socket *sock);
+
+static int sock_socket_init(TALLOC_CTX *mem_ctx, const char *sockpath,
+ struct sock_socket_funcs *funcs,
+ void *private_data,
+ struct sock_socket **result)
+{
+ struct sock_socket *sock;
+
+ if (funcs == NULL) {
+ return EINVAL;
+ }
+ if (funcs->read_send == NULL || funcs->read_recv == NULL) {
+ return EINVAL;
+ }
+
+ sock = talloc_zero(mem_ctx, struct sock_socket);
+ if (sock == NULL) {
+ return ENOMEM;
+ }
+
+ sock->sockpath = talloc_strdup(sock, sockpath);
+ if (sock->sockpath == NULL) {
+ talloc_free(sock);
+ return ENOMEM;
+ }
+ sock->funcs = funcs;
+ sock->private_data = private_data;
+ sock->fd = -1;
+
+ talloc_set_destructor(sock, sock_socket_destructor);
+
+ *result = sock;
+ return 0;
+}
+
+static int sock_socket_destructor(struct sock_socket *sock)
+{
+ TALLOC_FREE(sock->req);
+
+ if (sock->fd != -1) {
+ close(sock->fd);
+ sock->fd = -1;
+ }
+
+ unlink(sock->sockpath);
+ return 0;
+}
+
+
+struct sock_socket_start_state {
+ struct tevent_context *ev;
+ struct sock_socket *sock;
+
+ struct sock_client *client_list;
+};
+
+static int sock_socket_start_state_destructor(
+ struct sock_socket_start_state *state);
+static void sock_socket_start_new_client(struct tevent_req *subreq);
+static int sock_socket_start_client_destructor(struct sock_client *client);
+
+static struct tevent_req *sock_socket_start_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct sock_socket *sock,
+ bool remove_before_use)
+{
+ struct tevent_req *req, *subreq;
+ struct sock_socket_start_state *state;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct sock_socket_start_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ state->ev = ev;
+ state->sock = sock;
+
+ sock->fd = socket_setup(sock->sockpath, remove_before_use);
+ if (sock->fd == -1) {
+ tevent_req_error(req, EIO);
+ return tevent_req_post(req, ev);
+ }
+
+ talloc_set_destructor(state, sock_socket_start_state_destructor);
+
+ subreq = accept_send(state, ev, sock->fd);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, sock_socket_start_new_client, req);
+
+ sock->req = req;
+
+ return req;
+}
+
+static int sock_socket_start_state_destructor(
+ struct sock_socket_start_state *state)
+{
+ struct sock_client *client;
+
+ while ((client = state->client_list) != NULL) {
+ talloc_free(client);
+ }
+
+ return 0;
+}
+
+static void sock_socket_start_new_client(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_socket_start_state *state = tevent_req_data(
+ req, struct sock_socket_start_state);
+ struct sock_client *client;
+ int client_fd, ret;
+
+ client_fd = accept_recv(subreq, NULL, NULL, &ret);
+ TALLOC_FREE(subreq);
+ if (client_fd == -1) {
+ D_ERR("failed to accept new connection\n");
+ }
+
+ subreq = accept_send(state, state->ev, state->sock->fd);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, sock_socket_start_new_client, req);
+
+ if (client_fd == -1) {
+ return;
+ }
+
+ client = talloc_zero(state, struct sock_client);
+ if (tevent_req_nomem(client, req)) {
+ close(client_fd);
+ return;
+ }
+
+ client->req = req;
+
+ ret = sock_client_context_init(client, state->ev, state->sock,
+ client_fd, client, &client->client_ctx);
+ if (ret != 0) {
+ talloc_free(client);
+ return;
+ }
+
+ talloc_set_destructor(client, sock_socket_start_client_destructor);
+ DLIST_ADD(state->client_list, client);
+}
+
+static int sock_socket_start_client_destructor(struct sock_client *client)
+{
+ struct sock_socket_start_state *state = tevent_req_data(
+ client->req, struct sock_socket_start_state);
+
+ DLIST_REMOVE(state->client_list, client);
+ TALLOC_FREE(client->client_ctx);
+
+ return 0;
+}
+
+static bool sock_socket_start_recv(struct tevent_req *req, int *perr,
+ TALLOC_CTX *mem_ctx, const char **sockpath)
+{
+ struct sock_socket_start_state *state = tevent_req_data(
+ req, struct sock_socket_start_state);
+ int ret;
+
+ state->sock->req = NULL;
+
+ if (tevent_req_is_unix_error(req, &ret)) {
+ if (perr != NULL) {
+ *perr = ret;
+ }
+ return false;
+ }
+
+ if (sockpath != NULL) {
+ *sockpath = talloc_steal(mem_ctx, state->sock->sockpath);
+ }
+
+ return true;
+}
+
+/*
+ * Send message to a client
+ */
+
+struct tevent_req *sock_socket_write_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct sock_client_context *client_ctx,
+ uint8_t *buf, size_t buflen)
+{
+ struct tevent_req *req;
+
+ req = comm_write_send(mem_ctx, ev, client_ctx->comm, buf, buflen);
+
+ return req;
+}
+
+bool sock_socket_write_recv(struct tevent_req *req, int *perr)
+{
+ int ret;
+ bool status;
+
+ status = comm_write_recv(req, &ret);
+ if (! status) {
+ if (perr != NULL) {
+ *perr = ret;
+ }
+ }
+
+ return status;
+}
+
+/*
+ * Socket daemon
+ */
+
+int sock_daemon_setup(TALLOC_CTX *mem_ctx, const char *daemon_name,
+ const char *logging, const char *debug_level,
+ struct sock_daemon_funcs *funcs,
+ void *private_data,
+ struct sock_daemon_context **out)
+{
+ struct sock_daemon_context *sockd;
+ int ret;
+
+ sockd = talloc_zero(mem_ctx, struct sock_daemon_context);
+ if (sockd == NULL) {
+ return ENOMEM;
+ }
+
+ sockd->funcs = funcs;
+ sockd->private_data = private_data;
+ sockd->startup_fd = -1;
+
+ ret = logging_init(sockd, logging, debug_level, daemon_name);
+ if (ret != 0) {
+ fprintf(stderr,
+ "Failed to initialize logging, logging=%s, debug=%s\n",
+ logging, debug_level);
+ return ret;
+ }
+
+ *out = sockd;
+ return 0;
+}
+
+int sock_daemon_add_unix(struct sock_daemon_context *sockd,
+ const char *sockpath,
+ struct sock_socket_funcs *funcs,
+ void *private_data)
+{
+ struct sock_socket *sock;
+ int ret;
+
+ ret = sock_socket_init(sockd, sockpath, funcs, private_data, &sock);
+ if (ret != 0) {
+ return ret;
+ }
+
+
+ DLIST_ADD(sockd->socket_list, sock);
+ return 0;
+}
+
+bool sock_daemon_set_startup_fd(struct sock_daemon_context *sockd, int fd)
+{
+ if (! set_close_on_exec(fd)) {
+ D_ERR("Failed to set close-on-exec on startup fd\n");
+ return false;
+ }
+
+ sockd->startup_fd = fd;
+ return true;
+}
+
+/*
+ * Run socket daemon
+ */
+
+struct sock_daemon_run_state {
+ struct tevent_context *ev;
+ struct sock_daemon_context *sockd;
+ pid_t pid_watch;
+
+ int fd;
+ int exit_code;
+};
+
+static void sock_daemon_run_started(struct tevent_req *subreq);
+static void sock_daemon_run_startup_done(struct tevent_req *subreq);
+static void sock_daemon_run_signal_handler(struct tevent_context *ev,
+ struct tevent_signal *se,
+ int signum, int count, void *siginfo,
+ void *private_data);
+static void sock_daemon_run_reconfigure(struct tevent_req *req);
+static void sock_daemon_run_reconfigure_done(struct tevent_req *subreq);
+static void sock_daemon_run_reopen_logs(struct tevent_req *req);
+static void sock_daemon_run_reopen_logs_done(struct tevent_req *subreq);
+static void sock_daemon_run_shutdown(struct tevent_req *req);
+static void sock_daemon_run_shutdown_done(struct tevent_req *subreq);
+static void sock_daemon_run_exit(struct tevent_req *req);
+static bool sock_daemon_run_socket_listen(struct tevent_req *req);
+static void sock_daemon_run_socket_fail(struct tevent_req *subreq);
+static void sock_daemon_run_watch_pid(struct tevent_req *subreq);
+static void sock_daemon_run_wait(struct tevent_req *req);
+static void sock_daemon_run_wait_done(struct tevent_req *subreq);
+static void sock_daemon_startup_notify(struct sock_daemon_context *sockd);
+
+struct tevent_req *sock_daemon_run_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct sock_daemon_context *sockd,
+ const char *pidfile,
+ bool do_fork, bool create_session,
+ pid_t pid_watch)
+{
+ struct tevent_req *req, *subreq;
+ struct sock_daemon_run_state *state;
+ struct tevent_signal *se;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct sock_daemon_run_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ become_daemon(do_fork, !create_session, false);
+
+ if (pidfile != NULL) {
+ int ret = pidfile_context_create(sockd, pidfile,
+ &sockd->pid_ctx);
+ if (ret != 0) {
+ tevent_req_error(req, EEXIST);
+ return tevent_req_post(req, ev);
+ }
+ }
+
+ state->ev = ev;
+ state->sockd = sockd;
+ state->pid_watch = pid_watch;
+ state->fd = -1;
+
+ subreq = tevent_wakeup_send(state, ev,
+ tevent_timeval_current_ofs(0, 0));
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, sock_daemon_run_started, req);
+
+ se = tevent_add_signal(ev, state, SIGHUP, 0,
+ sock_daemon_run_signal_handler, req);
+ if (tevent_req_nomem(se, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ se = tevent_add_signal(ev, state, SIGUSR1, 0,
+ sock_daemon_run_signal_handler, req);
+ if (tevent_req_nomem(se, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ se = tevent_add_signal(ev, state, SIGINT, 0,
+ sock_daemon_run_signal_handler, req);
+ if (tevent_req_nomem(se, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ se = tevent_add_signal(ev, state, SIGTERM, 0,
+ sock_daemon_run_signal_handler, req);
+ if (tevent_req_nomem(se, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ if (pid_watch > 1) {
+ subreq = tevent_wakeup_send(state, ev,
+ tevent_timeval_current_ofs(1,0));
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, sock_daemon_run_watch_pid,
+ req);
+ }
+
+ return req;
+}
+
+static void sock_daemon_run_started(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+ bool status;
+
+ status = tevent_wakeup_recv(subreq);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ tevent_req_error(req, EIO);
+ return;
+ }
+
+ D_NOTICE("daemon started, pid=%u\n", getpid());
+
+ if (sockd->funcs != NULL && sockd->funcs->startup_send != NULL &&
+ sockd->funcs->startup_recv != NULL) {
+ subreq = sockd->funcs->startup_send(state, state->ev,
+ sockd->private_data);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, sock_daemon_run_startup_done,
+ req);
+ return;
+ }
+
+ if (sockd->funcs != NULL && sockd->funcs->startup != NULL) {
+ int ret;
+
+ ret = sockd->funcs->startup(sockd->private_data);
+ if (ret != 0) {
+ D_ERR("startup failed, ret=%d\n", ret);
+ tevent_req_error(req, EIO);
+ return;
+ }
+
+ D_NOTICE("startup completed successfully\n");
+ }
+
+ status = sock_daemon_run_socket_listen(req);
+ if (! status) {
+ return;
+ }
+ sock_daemon_run_wait(req);
+
+ sock_daemon_startup_notify(sockd);
+}
+
+static void sock_daemon_run_startup_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+ int ret;
+ bool status;
+
+ status = sockd->funcs->startup_recv(subreq, &ret);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ D_ERR("startup failed, ret=%d\n", ret);
+ tevent_req_error(req, EIO);
+ return;
+ }
+
+ D_NOTICE("startup completed successfully\n");
+
+ status = sock_daemon_run_socket_listen(req);
+ if (! status) {
+ return;
+ }
+ sock_daemon_run_wait(req);
+
+ sock_daemon_startup_notify(sockd);
+}
+
+static void sock_daemon_run_signal_handler(struct tevent_context *ev,
+ struct tevent_signal *se,
+ int signum, int count, void *siginfo,
+ void *private_data)
+{
+ struct tevent_req *req = talloc_get_type_abort(
+ private_data, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+
+ D_NOTICE("Received signal %d\n", signum);
+
+ if (signum == SIGUSR1) {
+ sock_daemon_run_reconfigure(req);
+ return;
+ }
+
+ if (signum == SIGHUP) {
+ sock_daemon_run_reopen_logs(req);
+ return;
+ }
+
+ if (signum == SIGINT || signum == SIGTERM) {
+ state->exit_code = EINTR;
+ sock_daemon_run_shutdown(req);
+ }
+}
+
+static void sock_daemon_run_reconfigure(struct tevent_req *req)
+{
+ struct tevent_req *subreq;
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+
+ if (sockd->funcs != NULL && sockd->funcs->reconfigure_send != NULL &&
+ sockd->funcs->reconfigure_recv != NULL) {
+ subreq = sockd->funcs->reconfigure_send(state, state->ev,
+ sockd->private_data);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq,
+ sock_daemon_run_reconfigure_done, req);
+ return;
+ }
+
+ if (sockd->funcs != NULL && sockd->funcs->reconfigure != NULL) {
+ int ret;
+
+ ret = sockd->funcs->reconfigure(sockd->private_data);
+ if (ret != 0) {
+ D_ERR("reconfigure failed, ret=%d\n", ret);
+ return;
+ }
+
+ D_NOTICE("reconfigure completed successfully\n");
+ }
+}
+
+static void sock_daemon_run_reconfigure_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+ int ret;
+ bool status;
+
+ status = sockd->funcs->reconfigure_recv(subreq, &ret);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ D_ERR("reconfigure failed, ret=%d\n", ret);
+ return;
+ }
+
+ D_NOTICE("reconfigure completed successfully\n");
+}
+
+static void sock_daemon_run_reopen_logs(struct tevent_req *req)
+{
+ struct tevent_req *subreq;
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+
+ if (sockd->funcs != NULL && sockd->funcs->reopen_logs_send != NULL &&
+ sockd->funcs->reopen_logs_recv != NULL) {
+ subreq = sockd->funcs->reopen_logs_send(state, state->ev,
+ sockd->private_data);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq,
+ sock_daemon_run_reopen_logs_done, req);
+ return;
+ }
+
+ if (sockd->funcs != NULL && sockd->funcs->reopen_logs != NULL) {
+ int ret;
+
+ ret = sockd->funcs->reopen_logs(sockd->private_data);
+ if (ret != 0) {
+ D_ERR("reopen logs, ret=%d\n", ret);
+ return;
+ }
+
+ D_NOTICE("reopen logs completed successfully\n");
+ }
+}
+
+static void sock_daemon_run_reopen_logs_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+ int ret;
+ bool status;
+
+ status = sockd->funcs->reopen_logs_recv(subreq, &ret);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ D_ERR("reopen logs failed, ret=%d\n", ret);
+ return;
+ }
+
+ D_NOTICE("reopen logs completed successfully\n");
+}
+
+static void sock_daemon_run_shutdown(struct tevent_req *req)
+{
+ struct tevent_req *subreq;
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+ struct sock_socket *sock;
+
+ D_NOTICE("Shutting down\n");
+
+ while ((sock = sockd->socket_list) != NULL) {
+ DLIST_REMOVE(sockd->socket_list, sock);
+ TALLOC_FREE(sock);
+ }
+
+ if (sockd->funcs != NULL && sockd->funcs->shutdown_send != NULL &&
+ sockd->funcs->shutdown_recv != NULL) {
+ subreq = sockd->funcs->shutdown_send(state, state->ev,
+ sockd->private_data);
+ if (subreq == NULL) {
+ sock_daemon_run_exit(req);
+ return;
+ }
+ tevent_req_set_callback(subreq, sock_daemon_run_shutdown_done,
+ req);
+ return;
+ }
+
+ if (sockd->funcs != NULL && sockd->funcs->shutdown != NULL) {
+ sockd->funcs->shutdown(sockd->private_data);
+ }
+
+ sock_daemon_run_exit(req);
+}
+
+static void sock_daemon_run_shutdown_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+
+ sockd->funcs->shutdown_recv(subreq);
+ TALLOC_FREE(subreq);
+
+ sock_daemon_run_exit(req);
+}
+
+static void sock_daemon_run_exit(struct tevent_req *req)
+{
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+
+ TALLOC_FREE(sockd->pid_ctx);
+
+ if (state->exit_code == 0) {
+ tevent_req_done(req);
+ } else {
+ tevent_req_error(req, state->exit_code);
+ }
+}
+
+static bool sock_daemon_run_socket_listen(struct tevent_req *req)
+{
+ struct tevent_req *subreq;
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+ struct sock_socket *sock;
+ bool remove_before_use = false;
+
+ if (sockd->pid_ctx != NULL) {
+ remove_before_use = true;
+ }
+ for (sock = sockd->socket_list; sock != NULL; sock = sock->next) {
+ subreq = sock_socket_start_send(state, state->ev, sock,
+ remove_before_use);
+ if (tevent_req_nomem(subreq, req)) {
+ return false;
+ }
+ tevent_req_set_callback(subreq, sock_daemon_run_socket_fail,
+ req);
+ }
+
+ return true;
+}
+
+static void sock_daemon_run_socket_fail(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ const char *sockpath = "INVALID";
+ int ret = 0;
+ bool status;
+
+ status = sock_socket_start_recv(subreq, &ret, state, &sockpath);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ D_ERR("socket %s closed unexpectedly\n", sockpath);
+ state->exit_code = ret;
+ } else {
+ state->exit_code = 0;
+ }
+
+ sock_daemon_run_shutdown(req);
+}
+
+static void sock_daemon_run_watch_pid(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ int ret;
+ bool status;
+
+ status = tevent_wakeup_recv(subreq);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ tevent_req_error(req, EIO);
+ return;
+ }
+
+ ret = kill(state->pid_watch, 0);
+ if (ret == -1) {
+ if (errno == ESRCH) {
+ D_ERR("PID %d gone away, exiting\n", state->pid_watch);
+ state->exit_code = ESRCH;
+ sock_daemon_run_shutdown(req);
+ return;
+ } else {
+ D_ERR("Failed to check PID status %d, ret=%d\n",
+ state->pid_watch, errno);
+ }
+ }
+
+ subreq = tevent_wakeup_send(state, state->ev,
+ tevent_timeval_current_ofs(5,0));
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, sock_daemon_run_watch_pid, req);
+}
+
+static void sock_daemon_run_wait(struct tevent_req *req)
+{
+ struct tevent_req *subreq;
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+
+ if (sockd->funcs != NULL && sockd->funcs->wait_send != NULL &&
+ sockd->funcs->wait_recv != NULL) {
+ subreq = sockd->funcs->wait_send(state, state->ev,
+ sockd->private_data);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, sock_daemon_run_wait_done,
+ req);
+ }
+}
+
+static void sock_daemon_run_wait_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct sock_daemon_run_state *state = tevent_req_data(
+ req, struct sock_daemon_run_state);
+ struct sock_daemon_context *sockd = state->sockd;
+ int ret = 0;
+ bool status;
+
+ status = sockd->funcs->wait_recv(subreq, &ret);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ state->exit_code = ret;
+ } else {
+ state->exit_code = 0;
+ }
+
+ sock_daemon_run_shutdown(req);
+}
+
+static void sock_daemon_startup_notify(struct sock_daemon_context *sockd)
+{
+ if (sockd->startup_fd != -1) {
+ unsigned int zero = 0;
+ ssize_t num;
+
+ num = sys_write(sockd->startup_fd, &zero, sizeof(zero));
+ if (num != sizeof(zero)) {
+ D_WARNING("Failed to write zero to pipe FD\n");
+ }
+ }
+}
+
+bool sock_daemon_run_recv(struct tevent_req *req, int *perr)
+{
+ int ret;
+
+ if (tevent_req_is_unix_error(req, &ret)) {
+ if (perr != NULL) {
+ *perr = ret;
+ }
+ return false;
+ }
+
+ return true;
+}
+
+int sock_daemon_run(struct tevent_context *ev,
+ struct sock_daemon_context *sockd,
+ const char *pidfile,
+ bool do_fork, bool create_session,
+ pid_t pid_watch)
+{
+ struct tevent_req *req;
+ int ret;
+ bool status;
+
+ req = sock_daemon_run_send(ev, ev, sockd,
+ pidfile, do_fork, create_session, pid_watch);
+ if (req == NULL) {
+ return ENOMEM;
+ }
+
+ tevent_req_poll(req, ev);
+
+ status = sock_daemon_run_recv(req, &ret);
+ TALLOC_FREE(req);
+ if (! status) {
+ return ret;
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 21:35:45 +0000