blob: db71fd17a9cdb2ecb15f34b5c742edf2d00b75f7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
#!/bin/bash
#
# This file is part of TALER
# Copyright (C) 2023, 2024 Taler Systems SA
#
# TALER 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, or
# (at your option) any later version.
#
# TALER 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 TALER; see the file COPYING. If not, see
# <http://www.gnu.org/licenses/>
#
# Author: Christian Grothoff
#
# Script to test for network connectivity, and if
# successful launch some "main" application. If
# the network goes down, stop the "main" application
# and show an error message.
#
set -eu
EXIT_STATUS=0
CHILD_PID=-1
ERROR_PID=-1
# Exit, with error message (hard failure)
function exit_fail() {
echo " FAILURE:" "$@" >&2
EXIT_STATUS=1
exit "$EXIT_STATUS"
}
CONF="$HOME/.config/taler.conf"
# Parse command-line options
while getopts ':c:f:h' OPTION; do
case "$OPTION" in
c)
CONF="$OPTARG"
;;
f)
FAIL_PROG="$OPTARG"
;;
h)
echo 'Supported options:'
# shellcheck disable=SC2016
echo ' -c $CONF -- set configuration'
# shellcheck disable=SC2016
echo ' -f $CMD -- command to run to display failures'
;;
?)
exit_fail "Unrecognized command line option"
;;
esac
done
shift $((OPTIND - 1))
WORKER="$@"
dig -h > /dev/null || exit_fail "'dig' is required"
if [[ ${FAIL_PROG:-} = "" ]]
then
FAIL_PROG=$(taler-config -c "$CONF" -s taler-mdb -o "FAIL_HELPER")
fi
# Cleanup to run whenever we exit
function cleanup()
{
echo "network-check terminating!" >&2
if [ "$ERROR_PID" != "-1" ]
then
kill -TERM "$ERROR_PID"
wait "$ERROR_PID"
ERROR_PID="-1"
fi
if [ "$CHILD_PID" != "-1" ]
then
kill -TERM "$CHILD_PID"
wait "$CHILD_PID"
CHILD_PID="-1"
fi
for n in $(jobs -p)
do
kill "$n" 2> /dev/null || true
done
wait
exit "$EXIT_STATUS"
}
# Function called with the short-hand of a detected
# Failure. Stop our child (if any) and show it.
function show_failure()
{
echo "Showing failure $1"
if [ "$ERROR_PID" != "-1" ]
then
kill -TERM "$ERROR_PID"
wait
ERROR_PID="-1"
fi
if [ "$CHILD_PID" != "-1" ]
then
kill -TERM "$CHILD_PID"
wait
CHILD_PID="-1"
fi
${FAIL_PROG} "$1" >&2 &
ERROR_PID=$!
}
# Install cleanup handler (except for kill -9)
trap cleanup EXIT
# shellcheck disable=SC2120
function check_network()
{
DEF_BACKEND=$(taler-config -c "$CONF" -s "taler-mdb" -o "BACKEND_BASE_URL")
BACKEND_HOSTNAME=$(echo "$DEF_BACKEND" | awk -F/ '{print $3}')
BACKEND_AUTH=$(taler-config -c "$CONF" -s "taler-mdb" -o "BACKEND_AUTHORIZATION")
DNS_HOST=$(grep nameserver /etc/resolv.conf | grep -v '^#' | head -n1 | awk '{print $2}')
if ! ping -c1 "$DNS_HOST" &> /dev/null
then
show_failure no-ip
return
fi
if ! dig "$BACKEND_HOSTNAME" &> /dev/null
then
show_failure backend-dns-resolution-failure
return
fi
if ! ping -c1 "$BACKEND_HOSTNAME" &> /dev/null
then
show_failure backend-unreachable
return
fi
if echo "$DEF_BACKEND" | grep "https://" > /dev/null
then
if ! wget --no-check-certificate "${DEF_BACKEND}config" -O /dev/null &> /dev/null
then
show_failure backend-no-webserver
return
fi
fi
if ! wget "${DEF_BACKEND}config" -O /dev/null &> /dev/null
then
show_failure backend-x509-cert-bad
return
fi
HAVE_PRODUCT=0
for PS in $(taler-config -c "$CONF" -S | grep "product-" | head -n1)
do
URL=$(taler-config -c "$CONF" -s "$PS" -o "INSTANCE" 2> /dev/null || echo "$DEF_BACKEND")
AUTH=$(taler-config -c "$CONF" -s "$PS" -o "BACKEND_AUTHORIZATION" 2> /dev/null || echo "$BACKEND_AUTH")
if ! wget --header "Authorization: $AUTH" "${URL}private/orders" -O /dev/null &> /dev/null
then
echo "Failed to access backend for product '$PS'" >&2
else
HAVE_PRODUCT=1
fi
done
if [ "$HAVE_PRODUCT" = 0 ]
then
show_failure backend-auth-failure
return
fi
echo "Network OK"
if [ "$ERROR_PID" != "-1" ]
then
kill -TERM "$ERROR_PID"
wait
ERROR_PID="-1"
fi
if [ "$CHILD_PID" = "-1" ]
then
echo "Starting child using $WORKER"
# shellcheck disable=SC2068
$WORKER &
CHILD_PID=$!
fi
}
# Check network status
while true
do
echo "Checking network status"
check_network
sleep 30
if ! ps "$ERROR_PID" &> /dev/null
then
wait "${ERROR_PID}"
ERROR_PID="-1"
fi
if ! ps "$CHILD_PID" &> /dev/null
then
wait "${CHILD_PID}"
CHILD_PID="-1"
fi
done
|
