Annotation of badi/public_scripts/canardien/canardien, revision 1.6
1.1 adi 1: #!/bin/bash
2:
1.6 ! adi 3: # canardien 0.0.6
! 4: # (c) 2005-2021 under GPL by Adrian Zaugg
1.1 adi 5:
6:
1.4 adi 7: # canardien [<host> [<host> ...]]
8:
1.6 ! adi 9: # canardiens pings a machine, originally ente.limmat.ch thus its name,
1.4 adi 10: # to determine wether she is gone diving.
11:
1.1 adi 12:
13: ## Settings
14: #
15:
1.4 adi 16: # Hosts to ping. use a space separated list for multiple targets. All
17: # hosts of the list are checked and their results reported individually.
18: # Hosts given on the command line overwrite this setting.
19: HOSTS=""
1.1 adi 20:
21: # eMail Alerts
22: # Send alert email messages to the following address(es). Leave empty
23: # for no alert. For multiple destinations use a comma separated list.
1.3 adi 24: ALERT_TO="root"
1.1 adi 25:
26: # Subject of alert email
1.4 adi 27: ALERT_SUBJECT='"Attention: no answer from $HOST anymore!"'
1.1 adi 28:
1.4 adi 29: # Text of Message (Put variables in 'single quotes' to protect them. They
30: # should get expanded at the time the message is sent!)
1.3 adi 31: ALERT_TEXT='"\n[$TIME_STAMP]\n\nALERT!!\n\n\t$HOST is down!\n\nYou should probably do something, please.\n\nKind regards, $PINGHOST."'
1.1 adi 32:
1.4 adi 33: # Path to fping
34: PING=""
1.1 adi 35:
1.4 adi 36: # Answer of fping to reachable hosts
1.1 adi 37: ALIVE_ANSWER="is alive"
38:
1.4 adi 39: # Max number of pakets to send before giving up. Time increases exponentially,
40: # use a number < 7.
1.6 ! adi 41: RETRIES=5
1.4 adi 42:
1.1 adi 43: # Temporary file path
44: TMPDIR="/tmp"
45:
46: # This hosts name
1.4 adi 47: PINGHOST="$(uname -n)"
1.1 adi 48:
1.4 adi 49: # Set to an empty string to avoid debug output,
1.1 adi 50: # to "low" for a few, output and to anything else
51: # for verbose output
1.4 adi 52: DEBUG=verbose
1.1 adi 53:
1.4 adi 54: # For silent (non-error) operation set to anything,
1.1 adi 55: # comment out to enable text output
1.4 adi 56: #SILENT=shshsh
1.1 adi 57:
58:
59: # -----------functions-----------
60:
1.4 adi 61: # Initialize.
62: function init() {
63:
64: # check fping existence
65: if [ -z "$PING" ]; then
66: PING="$(which fping)"
67: fi
1.1 adi 68: if [ ${#PING} -eq 0 ]; then
1.4 adi 69: echo "Error: fping external program not found or not set. Exitting." >&2
70: exit 1
71: fi
72: if [ ! -x "$PING" ]; then
73: echo "Error: Can't execute the program set to use as fping. Please enter the correct path to \"fping\"." >&2
1.1 adi 74: exit 1
75: fi
1.3 adi 76:
1.4 adi 77: # get hostset
78: if [ -n "$*" ]; then
79: HOSTS="$*"
80: fi
1.6 ! adi 81:
! 82: # remove multiple spaces and trim
! 83: HOSTS="$(echo "$HOSTS" | sed -e "s/ \{1,\}/ /g" -e "s/^ //" -e "s/ $//")"
! 84:
1.4 adi 85: if [ -z "$HOSTS" ]; then
86: echo "Error: No host to ping." >&2
1.6 ! adi 87: exit 1
1.4 adi 88: fi
1.1 adi 89: }
90:
1.4 adi 91:
92: # If a host responds to pings, it is considered up.
93: function checkconnection() {
94:
1.6 ! adi 95: unset UP
1.4 adi 96:
1.6 ! adi 97: # ping host
! 98: PING_ANSWER="$($PING -R -B 2 -r $RETRIES -p 50 "$HOST" 2>&1)"
! 99: PING_ERRNUM=$?
! 100: if [ $PING_ERRNUM -gt 2 ]; then
! 101: echo "Error: Got error $PING_ERRNUM from fping $(head -1 "$PING_ANSWER"). Disregarding $HOST." >&2
! 102: continue;
! 103: fi
! 104:
! 105: # parse answer
! 106: if [ $(echo "$PING_ANSWER" | grep -c "$ALIVE_ANSWER") -gt 0 ]; then
! 107: UP=true
! 108: fi
! 109: TIME_STAMP="$(date +"%a %e.%m.%y %H:%M:%S")"
! 110: if [ -n "$UP" ]; then
! 111: if [ ! "$DEBUG" = "low" ] && [ -n "$DEBUG" ]; then
! 112: shout "The connection to $HOST is up."
1.4 adi 113: fi
1.6 ! adi 114: else
! 115: if [ -n "$DEBUG" ]; then
! 116: shout "The connection to $HOST is down."
1.4 adi 117: fi
1.6 ! adi 118: fi
! 119:
! 120: # remember a hosts state
! 121: rememberstate
1.4 adi 122: }
123:
124:
125: # Rember recent state of host, trigger alert
126: function rememberstate() {
127: # Put a simple time stamp in a tmp file, when host is detected as down for the first time
128: if [ -z "$UP" ]; then
1.6 ! adi 129: if [ ! -e "$TMPDIR/.canardien-$PINGHOST-$HOST" ]; then
1.4 adi 130: # set time stamp
131: echo -ne "$TIME_STAMP" > "$TMPDIR/.canardien-$PINGHOST-$HOST"
132: # send alert
133: sendalert
134: elif [ -n "$DEBUG" ]; then
135: shout "Down since `cat $TMPDIR/.canardien-$PINGHOST-$HOST`."
136: fi
1.6 ! adi 137: else
1.4 adi 138: # Host is up
139: if [ -e "$TMPDIR/.canardien-$PINGHOST-$HOST" ]; then
140: if [ -n "$DEBUG" ]; then
141: shout "$HOST is up again."
142: fi
1.6 ! adi 143: # send alert
! 144: ALERT_SUBJECT='"The host $HOST answers again!"'
! 145: ALERT_TEXT='"[$(date +"%a %e.%m.%y %H:%M:%S")]\n\n\n$HOST is up again.\n--------------------------------------\n(downtime began $(cat "$TMPDIR/.canardien-$PINGHOST-$HOST"))\n\n\n Kind regards, $PINGHOST."'
! 146: sendalert
1.4 adi 147: # delete tmp file
148: rm "$TMPDIR/.canardien-$PINGHOST-$HOST"
1.6 ! adi 149: else
1.4 adi 150: # still running
151: if [ ! "$DEBUG" = "low" ] && [ -n "$DEBUG" ]; then
152: shout "$HOST is up."
153: fi
154: fi
155: fi
1.1 adi 156: }
157:
1.4 adi 158:
1.1 adi 159: # Send an email alert
1.4 adi 160: function sendalert() {
161: # send mail
1.1 adi 162: if [ ! -z "$ALERT_TO" ]; then
1.4 adi 163: eval alert_subject=\$$ALERT_SUBJECT
164: eval MSG=\$$ALERT_TEXT
165: echo -e -n "$MSG" | mail -s "$alert_subject" "$ALERT_TO"
166: if [ -n "$DEBUG" ]; then
167: shout "Alert sent to $ALERT_TO."
168: fi
1.1 adi 169: fi
170: }
171:
1.4 adi 172:
1.1 adi 173: # To avoid any output in case of a silent operation,
174: # shout instead of echo.
1.4 adi 175: function shout() {
176: if [ -z "$SILENT" ]; then
177: echo -e "$1"
178: fi
1.1 adi 179: }
180:
181:
182: # -----------main-----------
183:
1.4 adi 184: init "$*"
1.6 ! adi 185:
! 186: # call an instance for each host, when multiple hosts are given
! 187: if [[ "$HOSTS" =~ " " ]]; then
! 188: while read -r HOST; do
! 189: "$0" "$HOST" &
! 190: done <<< "$(echo "$HOSTS" | tr ' ' '\n')"
! 191: exit 0
! 192: else
! 193: # process a single host
! 194: HOST="$HOSTS"
! 195: checkconnection
! 196: fi
! 197:
1.1 adi 198: exit 0
1.6 ! adi 199:
! 200: # todo: Switches ( -q, --debug, ...)
! 201: # grace period: do not send a mail if down time shorter than X minutes
! 202: # repeat down info after x hours
! 203: # test port instead of ping or in addition
! 204:
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