cib_native.c
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cib_native.c
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	/*
	* Copyright 2004 International Business Machines
	* Later changes copyright 2004-2024 the Pacemaker project contributors
	*
	* The version control history for this file may have further details.
	*
	* This source code is licensed under the GNU Lesser General Public License
	* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
	*/

	#include <crm_internal.h>

	#ifndef _GNU_SOURCE
	# define _GNU_SOURCE
	#endif

	#include <errno.h>
	#include <crm_internal.h>
	#include <unistd.h>
	#include <stdlib.h>
	#include <stdio.h>
	#include <stdarg.h>
	#include <string.h>

	#include <glib.h>

	#include <crm/crm.h>
	#include <crm/cib/internal.h>

	#include <crm/common/mainloop.h>
	#include <crm/common/xml.h>

	typedef struct cib_native_opaque_s {
	char *token;
	crm_ipc_t *ipc;
	void (*dnotify_fn) (gpointer user_data);
	mainloop_io_t *source;
	} cib_native_opaque_t;

	static int
	cib_native_perform_op_delegate(cib_t cib, const char op, const char *host,
	const char section, xmlNode data,
	xmlNode **output_data, int call_options,
	const char *user_name)
	{
	int rc = pcmk_ok;
	int reply_id = 0;
	enum crm_ipc_flags ipc_flags = crm_ipc_flags_none;

	xmlNode *op_msg = NULL;
	xmlNode *op_reply = NULL;

	cib_native_opaque_t *native = cib->variant_opaque;

	if (cib->state == cib_disconnected) {
	return -ENOTCONN;
	}

	if (output_data != NULL) {
	*output_data = NULL;
	}

	if (op == NULL) {
	crm_err("No operation specified");
	return -EINVAL;
	}

	if (call_options & cib_sync_call) {
	pcmk__set_ipc_flags(ipc_flags, "client", crm_ipc_client_response);
	}

	rc = cib__create_op(cib, op, host, section, data, call_options, user_name,
	NULL, &op_msg);
	if (rc != pcmk_ok) {
	return rc;
	}

	if (pcmk_is_set(call_options, cib_transaction)) {
	rc = cib__extend_transaction(cib, op_msg);
	goto done;
	}

	crm_trace("Sending %s message to the CIB manager (timeout=%ds)", op, cib->call_timeout);
	rc = crm_ipc_send(native->ipc, op_msg, ipc_flags, cib->call_timeout * 1000, &op_reply);

	if (rc < 0) {
	crm_err("Couldn't perform %s operation (timeout=%ds): %s (%d)", op,
	cib->call_timeout, pcmk_strerror(rc), rc);
	rc = -ECOMM;
	goto done;
	}

	crm_log_xml_trace(op_reply, "Reply");

	if (!(call_options & cib_sync_call)) {
	crm_trace("Async call, returning %d", cib->call_id);
	CRM_CHECK(cib->call_id != 0,
	rc = -ENOMSG; goto done);
	rc = cib->call_id;
	goto done;
	}

	rc = pcmk_ok;
	crm_element_value_int(op_reply, PCMK__XA_CIB_CALLID, &reply_id);
	if (reply_id == cib->call_id) {
	xmlNode *wrapper = pcmk__xe_first_child(op_reply, PCMK__XE_CIB_CALLDATA,
	NULL, NULL);
	xmlNode *tmp = pcmk__xe_first_child(wrapper, NULL, NULL, NULL);

	crm_trace("Synchronous reply %d received", reply_id);
	if (crm_element_value_int(op_reply, PCMK__XA_CIB_RC, &rc) != 0) {
	rc = -EPROTO;
	}

	if (output_data == NULL \|\| (call_options & cib_discard_reply)) {
	crm_trace("Discarding reply");
	} else {
	*output_data = pcmk__xml_copy(NULL, tmp);
	}

	} else if (reply_id <= 0) {
	crm_err("Received bad reply: No id set");
	crm_log_xml_err(op_reply, "Bad reply");
	rc = -ENOMSG;
	goto done;

	} else {
	crm_err("Received bad reply: %d (wanted %d)", reply_id, cib->call_id);
	crm_log_xml_err(op_reply, "Old reply");
	rc = -ENOMSG;
	goto done;
	}

	if (op_reply == NULL && cib->state == cib_disconnected) {
	rc = -ENOTCONN;

	} else if (rc == pcmk_ok && op_reply == NULL) {
	rc = -ETIME;
	}

	switch (rc) {
	case pcmk_ok:
	case -EPERM:
	break;

	/* This is an internal value that clients do not and should not care about */
	case -pcmk_err_diff_resync:
	rc = pcmk_ok;
	break;

	/* These indicate internal problems */
	case -EPROTO:
	case -ENOMSG:
	crm_err("Call failed: %s", pcmk_strerror(rc));
	if (op_reply) {
	crm_log_xml_err(op_reply, "Invalid reply");
	}
	break;

	default:
	if (!pcmk__str_eq(op, PCMK__CIB_REQUEST_QUERY, pcmk__str_none)) {
	crm_warn("Call failed: %s", pcmk_strerror(rc));
	}
	}

	done:
	if (!crm_ipc_connected(native->ipc)) {
	crm_err("The CIB manager disconnected");
	cib->state = cib_disconnected;
	}

	free_xml(op_msg);
	free_xml(op_reply);
	return rc;
	}

	static int
	cib_native_dispatch_internal(const char *buffer, ssize_t length,
	gpointer userdata)
	{
	const char *type = NULL;
	xmlNode *msg = NULL;

	cib_t *cib = userdata;

	crm_trace("dispatching %p", userdata);

	if (cib == NULL) {
	crm_err("No CIB!");
	return 0;
	}

	msg = pcmk__xml_parse(buffer);

	if (msg == NULL) {
	crm_warn("Received a NULL message from the CIB manager");
	return 0;
	}

	/* do callbacks */
	type = crm_element_value(msg, PCMK__XA_T);
	crm_trace("Activating %s callbacks...", type);
	crm_log_xml_explicit(msg, "cib-reply");

	if (pcmk__str_eq(type, PCMK__VALUE_CIB, pcmk__str_none)) {
	cib_native_callback(cib, msg, 0, 0);

	} else if (pcmk__str_eq(type, PCMK__VALUE_CIB_NOTIFY, pcmk__str_none)) {
	g_list_foreach(cib->notify_list, cib_native_notify, msg);

	} else {
	crm_err("Unknown message type: %s", type);
	}

	free_xml(msg);
	return 0;
	}

	static void
	cib_native_destroy(void *userdata)
	{
	cib_t *cib = userdata;
	cib_native_opaque_t *native = cib->variant_opaque;

	crm_trace("destroying %p", userdata);
	cib->state = cib_disconnected;
	native->source = NULL;
	native->ipc = NULL;

	if (native->dnotify_fn) {
	native->dnotify_fn(userdata);
	}
	}

	static int
	cib_native_signoff(cib_t *cib)
	{
	cib_native_opaque_t *native = cib->variant_opaque;

	crm_debug("Disconnecting from the CIB manager");

	cib_free_notify(cib);
	remove_cib_op_callback(0, TRUE);

	if (native->source != NULL) {
	/* Attached to mainloop */
	mainloop_del_ipc_client(native->source);
	native->source = NULL;
	native->ipc = NULL;

	} else if (native->ipc) {
	/* Not attached to mainloop */
	crm_ipc_t *ipc = native->ipc;

	native->ipc = NULL;
	crm_ipc_close(ipc);
	crm_ipc_destroy(ipc);
	}

	cib->cmds->end_transaction(cib, false, cib_none);
	cib->state = cib_disconnected;
	cib->type = cib_no_connection;

	return pcmk_ok;
	}

	static int
	cib_native_signon_raw(cib_t cib, const char name, enum cib_conn_type type,
	int *async_fd)
	{
	int rc = pcmk_ok;
	const char *channel = NULL;
	cib_native_opaque_t *native = cib->variant_opaque;
	xmlNode *hello = NULL;

	struct ipc_client_callbacks cib_callbacks = {
	.dispatch = cib_native_dispatch_internal,
	.destroy = cib_native_destroy
	};

	cib->call_timeout = PCMK__IPC_TIMEOUT;

	if (type == cib_command) {
	cib->state = cib_connected_command;
	channel = PCMK__SERVER_BASED_RW;

	} else if (type == cib_command_nonblocking) {
	cib->state = cib_connected_command;
	channel = PCMK__SERVER_BASED_SHM;

	} else if (type == cib_query) {
	cib->state = cib_connected_query;
	channel = PCMK__SERVER_BASED_RO;

	} else {
	return -ENOTCONN;
	}

	crm_trace("Connecting %s channel", channel);

	if (async_fd != NULL) {
	native->ipc = crm_ipc_new(channel, 0);
	if (native->ipc != NULL) {
	rc = pcmk__connect_generic_ipc(native->ipc);
	if (rc == pcmk_rc_ok) {
	rc = pcmk__ipc_fd(native->ipc, async_fd);
	if (rc != pcmk_rc_ok) {
	crm_info("Couldn't get file descriptor for %s IPC",
	channel);
	}
	}
	rc = pcmk_rc2legacy(rc);
	}

	} else {
	native->source =
	mainloop_add_ipc_client(channel, G_PRIORITY_HIGH, 512 * 1024 /* 512k */ , cib,
	&cib_callbacks);
	native->ipc = mainloop_get_ipc_client(native->source);
	}

	if (rc != pcmk_ok \|\| native->ipc == NULL \|\| !crm_ipc_connected(native->ipc)) {
	crm_info("Could not connect to CIB manager for %s", name);
	rc = -ENOTCONN;
	}

	if (rc == pcmk_ok) {
	rc = cib__create_op(cib, CRM_OP_REGISTER, NULL, NULL, NULL,
	cib_sync_call, NULL, name, &hello);
	}

	if (rc == pcmk_ok) {
	xmlNode *reply = NULL;

	if (crm_ipc_send(native->ipc, hello, crm_ipc_client_response, -1,
	&reply) > 0) {
	const char *msg_type = crm_element_value(reply, PCMK__XA_CIB_OP);

	crm_log_xml_trace(reply, "reg-reply");

	if (!pcmk__str_eq(msg_type, CRM_OP_REGISTER, pcmk__str_casei)) {
	crm_info("Reply to CIB registration message has unknown type "
	"'%s'",
	msg_type);
	rc = -EPROTO;

	} else {
	native->token = crm_element_value_copy(reply,
	PCMK__XA_CIB_CLIENTID);
	if (native->token == NULL) {
	rc = -EPROTO;
	}
	}
	free_xml(reply);

	} else {
	rc = -ECOMM;
	}
	free_xml(hello);
	}

	if (rc == pcmk_ok) {
	crm_info("Successfully connected to CIB manager for %s", name);
	return pcmk_ok;
	}

	crm_info("Connection to CIB manager for %s failed: %s",
	name, pcmk_strerror(rc));
	cib_native_signoff(cib);
	return rc;
	}

	static int
	cib_native_signon(cib_t cib, const char name, enum cib_conn_type type)
	{
	return cib_native_signon_raw(cib, name, type, NULL);
	}

	static int
	cib_native_free(cib_t *cib)
	{
	int rc = pcmk_ok;

	if (cib->state != cib_disconnected) {
	rc = cib_native_signoff(cib);
	}

	if (cib->state == cib_disconnected) {
	cib_native_opaque_t *native = cib->variant_opaque;

	free(native->token);
	free(cib->variant_opaque);
	free(cib->cmds);
	free(cib->user);
	free(cib);
	}

	return rc;
	}

	static int
	cib_native_register_notification(cib_t cib, const char callback, int enabled)
	{
	int rc = pcmk_ok;
	xmlNode *notify_msg = pcmk__xe_create(NULL, PCMK__XE_CIB_CALLBACK);
	cib_native_opaque_t *native = cib->variant_opaque;

	if (cib->state != cib_disconnected) {
	crm_xml_add(notify_msg, PCMK__XA_CIB_OP, PCMK__VALUE_CIB_NOTIFY);
	crm_xml_add(notify_msg, PCMK__XA_CIB_NOTIFY_TYPE, callback);
	crm_xml_add_int(notify_msg, PCMK__XA_CIB_NOTIFY_ACTIVATE, enabled);
	rc = crm_ipc_send(native->ipc, notify_msg, crm_ipc_client_response,
	1000 * cib->call_timeout, NULL);
	if (rc <= 0) {
	crm_trace("Notification not registered: %d", rc);
	rc = -ECOMM;
	}
	}

	free_xml(notify_msg);
	return rc;
	}

	static int
	cib_native_set_connection_dnotify(cib_t *cib,
	void (*dnotify) (gpointer user_data))
	{
	cib_native_opaque_t *native = NULL;

	if (cib == NULL) {
	crm_err("No CIB!");
	return FALSE;
	}

	native = cib->variant_opaque;
	native->dnotify_fn = dnotify;

	return pcmk_ok;
	}

	/*!
	* \internal
	* \brief Get the given CIB connection's unique client identifier
	*
	* These can be used to check whether this client requested the action that
	* triggered a CIB notification.
	*
	* \param[in] cib CIB connection
	* \param[out] async_id If not \p NULL, where to store asynchronous client ID
	* \param[out] sync_id If not \p NULL, where to store synchronous client ID
	*
	* \return Legacy Pacemaker return code (specifically, \p pcmk_ok)
	*
	* \note This is the \p cib_native variant implementation of
	* \p cib_api_operations_t:client_id().
	* \note For \p cib_native objects, \p async_id and \p sync_id are the same.
	* \note The client ID is assigned during CIB sign-on.
	*/
	static int
	cib_native_client_id(const cib_t cib, const char *async_id,
	const char **sync_id)
	{
	cib_native_opaque_t *native = cib->variant_opaque;

	if (async_id != NULL) {
	*async_id = native->token;
	}
	if (sync_id != NULL) {
	*sync_id = native->token;
	}
	return pcmk_ok;
	}

	cib_t *
	cib_native_new(void)
	{
	cib_native_opaque_t *native = NULL;
	cib_t *cib = cib_new_variant();

	if (cib == NULL) {
	return NULL;
	}

	native = calloc(1, sizeof(cib_native_opaque_t));

	if (native == NULL) {
	free(cib);
	return NULL;
	}

	cib->variant = cib_native;
	cib->variant_opaque = native;

	native->ipc = NULL;
	native->source = NULL;
	native->dnotify_fn = NULL;

	/* assign variant specific ops */
	cib->delegate_fn = cib_native_perform_op_delegate;
	cib->cmds->signon = cib_native_signon;
	cib->cmds->signon_raw = cib_native_signon_raw;
	cib->cmds->signoff = cib_native_signoff;
	cib->cmds->free = cib_native_free;

	cib->cmds->register_notification = cib_native_register_notification;
	cib->cmds->set_connection_dnotify = cib_native_set_connection_dnotify;

	cib->cmds->client_id = cib_native_client_id;

	return cib;
	}

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