152 lines
5.9 KiB
C++
Executable File
152 lines
5.9 KiB
C++
Executable File
/*
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* Copyright (c) 2015-2016 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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*/
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/*
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* This implements the CGCS Host Watchdog ; /usr/local/bin/hostwd
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*
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* Call trace is as follows:
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* daemon_init
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* daemon_files_init
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* daemon_signal_init
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* daemon_configure
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* ini_parse
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* hostw_process_config
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* socket_init
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* hostw_socket_init
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*
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* daemon_service_run
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* hostw_service
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* _forever
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* hostw_service_command
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* kernel_watchdog_pet
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*
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*
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* This daemon waits for a "goenabled" signal and then
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* - starts the kernel watchdog (to insure against death of this process)
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* - regularly pets the watchdog
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* - expects regular updates from PMON indicating "sane" status
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* - PMON is configured via pmond.config to send updates at certain
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* intervals
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* - host watchdog reads PMON config file to determine the expected
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* interval, but allows for some flexability (HOSTW_UPDATE_TOLERANCE)
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* to allow for process scheduling, etc
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* - will log and reboot if PMON dies or if PMON reports system is not right
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*
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*/
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/**
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* @file
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* Wind River CGCS Host Watchdog Service Header
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*/
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#include <linux/un.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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using namespace std;
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#include "nodeBase.h"
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#include "daemon_ini.h" /* Ini Parser Header */
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#include "daemon_common.h" /* Common definitions and types for daemons */
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#include "daemon_option.h" /* Common options for daemons */
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#include "nodeTimers.h" /* maintenance timer utilities start/stop */
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#include "nodeUtil.h" /* common utilities */
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#include "hostwMsg.h" /* message format */
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/* Configuration Files */
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#define HOSTWD_CONFIG_FILE ((const char *)"/etc/mtc/hostwd.conf")
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#define PMOND_CONFIG_FILE ((const char *)"/etc/mtc/pmond.conf")
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/* kernel SysRq control interface file used to enable the magic SysRq key.
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* Used to ensure that the SysRq service is enabled when needed. */
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#define SYSRQ_CONTROL_INTERFACE ((const char *)"/proc/sys/kernel/sysrq")
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/* kernel SysRq trigger interface file used to trigger a SysRq command.
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* commands @ https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html */
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#define SYSRQ_COMMAND_INTERFACE ((const char *)"/proc/sysrq-trigger")
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#define HOSTW_MIN_KERN_UPDATE_PERIOD 5 /* user can set how long until kernel
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* watchdog panics, down to this
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* minimum (seconds) */
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/* Daemon Config Bit Masks */
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#define CONFIG_HOSTWD_FAILURE_THRESHOLD 0x01
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#define CONFIG_HOSTWD_REBOOT 0x02
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#define CONFIG_HOSTWD_USE_KERN_WD 0x04
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#define CONFIG_HOSTWD_CONSOLE_PATH 0x10
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#define CONFIG_HOSTWD_UPDATE_PERIOD 0x40
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#define CONFIG_KERNWD_UPDATE_PERIOD 0x80
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/** Daemon Config Mask */
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#define CONFIG_MASK (CONFIG_HOSTWD_FAILURE_THRESHOLD |\
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CONFIG_HOSTWD_REBOOT |\
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CONFIG_HOSTWD_USE_KERN_WD |\
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CONFIG_HOSTWD_CONSOLE_PATH |\
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CONFIG_HOSTWD_UPDATE_PERIOD |\
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CONFIG_KERNWD_UPDATE_PERIOD)
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#define PIPE_COMMAND_RESPON_LEN 100 /* max pipe command rsponse length */
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#define GRACEFUL_REBOOT_DELAY 60 /* how many seconds to wait for logger
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* to finish before we start reboot */
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#define FORCE_REBOOT_DELAY 300 /* how many seconds to wait for logger
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* and graceful reboot to finish before
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* we give up and force reboot */
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/* Context control structure */
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typedef struct
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{
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int nodetype ;
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/* Watchdog interface */
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/* ------------------ */
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int watchdog ; /** The opened /dev/watchdog file */
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int kernwd_update_period; /** period in seconds the watchdog is serviced */
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/* Loop counters */
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/* ------------------ */
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int pmon_grace_loops ; /** Messages we allow pmon to miss before panic */
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int process_grace_loops; /** Number of consecutive "something is wrong" */
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/* messages we allow before panic */
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struct sigaction info ; /**< This daemon signal action struct */
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struct sigaction prev ; /**< Action handler that was replaced */
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/**< This is put back on the exit */
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bool quorum_failed ; /** When true gates repeated failure handling */
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/* Crash Dump Support */
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/* ------------------ */
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bool kdump_supported ; /** State of kdump support; not supported default.
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* kdump support is queried through systemctl
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* on process startup when this is updated to
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* true if supported */
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int fd_sysrq_enable ; /** SysRq magic key file descriptor */
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int fd_sysrq_command ; /** SysRq command interface file descriptor */
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} hostw_ctrl_type ;
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/** Daemon Service messaging socket control structure */
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typedef struct
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{
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/** Unix socket used to listen for status updates */
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int status_sock; /**< Tx Event Socket */
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struct sockaddr_un status_addr; /**< Address to use for unix socket */
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fd_set readfds;
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} hostw_socket_type ;
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/* functions called between files */
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hostw_ctrl_type * get_ctrl_ptr(void);
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hostw_socket_type * hostw_getSock_ptr(void);
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void hostw_service(void);
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void hostw_log_and_reboot(void);
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int hostw_socket_init(void);
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void kernel_watchdog_pet(void) ;
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