blob: e4db368dd8efbb2da99492841e6a03c38c70d006 (
plain) (
blame)
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
|
# Generate /etc/resolv.conf
# Support resolvconf(8) if available
# We can merge other dhcpcd resolv.conf files into one like resolvconf,
# but resolvconf is preferred as other applications like VPN clients
# can readily hook into it.
# Also, resolvconf can configure local nameservers such as bind
# or dnsmasq. This is important as the libc resolver isn't that powerful.
resolv_conf_dir="$state_dir/resolv.conf"
NL="
"
: ${resolvconf:=resolvconf}
build_resolv_conf()
{
local cf="$state_dir/resolv.conf.$ifname"
local interfaces= header= search= srvs= servers= x=
# Build a list of interfaces
interfaces=$(list_interfaces "$resolv_conf_dir")
# Build the resolv.conf
if [ -n "$interfaces" ]; then
# Build the header
for x in ${interfaces}; do
header="$header${header:+, }$x"
done
# Build the search list
domain=$(cd "$resolv_conf_dir"; \
key_get_value "domain " ${interfaces})
search=$(cd "$resolv_conf_dir"; \
key_get_value "search " ${interfaces})
set -- ${domain}
domain="$1"
[ -n "$2" ] && search="$search $*"
[ -n "$search" ] && search="$(uniqify $search)"
[ "$domain" = "$search" ] && search=
[ -n "$domain" ] && domain="domain $domain$NL"
[ -n "$search" ] && search="search $search$NL"
# Build the nameserver list
srvs=$(cd "$resolv_conf_dir"; \
key_get_value "nameserver " ${interfaces})
for x in $(uniqify ${srvs}); do
servers="${servers}nameserver $x$NL"
done
fi
header="$signature_base${header:+ $from }$header"
# Assemble resolv.conf using our head and tail files
[ -f "$cf" ] && rm -f "$cf"
[ -d "$resolv_conf_dir" ] || mkdir -p "$resolv_conf_dir"
echo "$header" > "$cf"
if [ -f /etc/resolv.conf.head ]; then
cat /etc/resolv.conf.head >> "$cf"
else
echo "# /etc/resolv.conf.head can replace this line" >> "$cf"
fi
printf %s "$domain$search$servers" >> "$cf"
if [ -f /etc/resolv.conf.tail ]; then
cat /etc/resolv.conf.tail >> "$cf"
else
echo "# /etc/resolv.conf.tail can replace this line" >> "$cf"
fi
if change_file /etc/resolv.conf "$cf"; then
chmod 644 /etc/resolv.conf
fi
rm -f "$cf"
}
# Extract any ND DNS options from the RA
# For now, we ignore the lifetime of the DNS options unless they
# are absent or zero.
# In this case they are removed from consideration.
# See draft-gont-6man-slaac-dns-config-issues-01 for issues
# regarding DNS option lifetime in ND messages.
eval_nd_dns()
{
eval ltime=\$nd${i}_rdnss${j}_lifetime
if [ -z "$ltime" -o "$ltime" = 0 ]; then
rdnss=
else
eval rdnss=\$nd${i}_rdnss${j}_servers
fi
eval ltime=\$nd${i}_dnssl${j}_lifetime
if [ -z "$ltime" -o "$ltime" = 0 ]; then
dnssl=
else
eval dnssl=\$nd${i}_dnssl${j}_search
fi
[ -z "$rdnss" -a -z "$dnssl" ] && return 1
[ -n "$rdnss" ] && new_rdnss="$new_rdnss${new_rdnss:+ }$rdnss"
[ -n "$dnssl" ] && new_dnssl="$new_dnssl${new_dnssl:+ }$dnssl"
j=$(($j + 1))
return 0
}
add_resolv_conf()
{
local x= conf="$signature$NL" warn=true
local i j ltime rdnss dnssl new_rdnss new_dnssl
# Loop to extract the ND DNS options using our indexed shell values
i=1
j=1
while true; do
while true; do
eval_nd_dns || break
done
i=$(($i + 1))
j=1
eval_nd_dns || break
done
[ -n "$new_rdnss" ] && \
new_domain_name_servers="$new_domain_name_servers${new_domain_name_servers:+ }$new_rdnss"
[ -n "$new_dnssl" ] && \
new_domain_search="$new_domain_search${new_domain_search:+ }$new_dnssl"
# Derive a new domain from our various hostname options
if [ -z "$new_domain_name" ]; then
if [ "$new_dhcp6_fqdn" != "${new_dhcp6_fqdn#*.}" ]; then
new_domain_name="${new_dhcp6_fqdn#*.}"
elif [ "$new_fqdn" != "${new_fqdn#*.}" ]; then
new_domain_name="${new_fqdn#*.}"
elif [ "$new_host_name" != "${new_host_name#*.}" ]; then
new_domain_name="${new_host_name#*.}"
fi
fi
# If we don't have any configuration, remove it
if [ -z "$new_domain_name_servers" -a \
-z "$new_domain_name" -a \
-z "$new_domain_search" ]; then
remove_resolv_conf
return $?
fi
if [ -n "$new_domain_name" ]; then
set -- $new_domain_name
if valid_domainname "$1"; then
conf="${conf}domain $1$NL"
else
syslog err "Invalid domain name: $1"
fi
# If there is no search this, make this one
if [ -z "$new_domain_search" ]; then
new_domain_search="$new_domain_name"
[ "$new_domain_name" = "$1" ] && warn=true
fi
fi
if [ -n "$new_domain_search" ]; then
if valid_domainname_list $new_domain_search; then
conf="${conf}search $new_domain_search$NL"
elif ! $warn; then
syslog err "Invalid domain name in list:" \
"$new_domain_search"
fi
fi
for x in ${new_domain_name_servers}; do
conf="${conf}nameserver $x$NL"
done
if type "$resolvconf" >/dev/null 2>&1; then
[ -n "$ifmetric" ] && export IF_METRIC="$ifmetric"
printf %s "$conf" | "$resolvconf" -a "$ifname"
return $?
fi
if [ -e "$resolv_conf_dir/$ifname" ]; then
rm -f "$resolv_conf_dir/$ifname"
fi
[ -d "$resolv_conf_dir" ] || mkdir -p "$resolv_conf_dir"
printf %s "$conf" > "$resolv_conf_dir/$ifname"
build_resolv_conf
}
remove_resolv_conf()
{
if type "$resolvconf" >/dev/null 2>&1; then
"$resolvconf" -d "$ifname" -f
else
if [ -e "$resolv_conf_dir/$ifname" ]; then
rm -f "$resolv_conf_dir/$ifname"
fi
build_resolv_conf
fi
}
# For ease of use, map DHCP6 names onto our DHCP4 names
case "$reason" in
BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6)
new_domain_name_servers="$new_dhcp6_name_servers"
new_domain_search="$new_dhcp6_domain_search"
;;
esac
if $if_up || [ "$reason" = ROUTERADVERT ]; then
add_resolv_conf
elif $if_down; then
remove_resolv_conf
fi
|
