summaryrefslogtreecommitdiffstats
path: root/src/lib/ip
blob: 8723e5ba88da7201df0d068a98c1be20bf74e8c9 (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
## /usr/lib/network/globals needs to be sourced before this file


## Add resolv.conf entries for an interface
# $1: interface name
# $2...: entries, one line per variable
resolvconf_add() {
    local interface="$1"
    shift
    printf "%s\n" "$@" | resolvconf -a "$interface"
}


## Set up an IP configuration
# $Interface: interface name
# $IP: type of IPv4 configuration
# $IP6: type of IPv6 configuration
ip_set() {
    local addr line route interface_sysctl=${Interface/.//}

    if [[ -z $IP && -z $IP6 ]]; then
        report_error "Neither IP, nor IP6 was specified"
        return 1
    fi

    case $IP in
      dhcp)
        case ${DHCPClient:-dhcpcd} in
          dhcpcd)
            rm -f "/run/dhcpcd-$Interface".{pid,cache}
            # If using own dns, tell dhcpcd to NOT replace resolv.conf
            [[ $DNS ]] && DhcpcdOptions+=" -C resolv.conf"
            do_debug dhcpcd -qL -t "${TimeoutDHCP:-10}" $DHCPOptions "$Interface" 2>&1 | report_debug "$(cat)"
            # The first array value of PIPESTATUS is the exit status of dhcpcd
            if (( PIPESTATUS != 0 )); then
                report_error "DHCP IP lease attempt failed on interface '$Interface'"
                return 1
            fi
          ;;
          dhclient)
            rm -f "/run/dhclient-${Interface}.pid"
            if ! do_debug dhclient -q -e "TIMEOUT=${TimeoutDHCP:-10}" -pf "/run/dhclient-$Interface.pid" $DhclientOptions "$Interface"; then
                report_error "DHCP IP lease attempt failed on interface '$Interface'"
                return 1
            fi
          ;;
          *)
            report_error "Unsupported DHCP client: '$DHCPClient'"
            return 1
          ;;
        esac
      ;;
      static)
        if [[ $Address ]]; then
            for addr in "${Address[@]}"; do
                if ! do_debug ip addr add "$addr" brd + dev "$Interface"; then
                    report_error "Could not add address '$addr' to interface '$Interface'"
                    return 1
                fi
            done
        fi
        if [[ $Gateway ]]; then
            if ! do_debug ip route add default via "$Gateway" dev "$Interface"; then
                report_error "Could not set gateway '$Gateway' on interface '$Interface'"
                return 1
            fi
        fi
      ;;
      ""|no)
      ;;
      *)
        report_error "IP must be either 'dhcp', 'static' or 'no'"
        return 1
      ;;
    esac

    # Add static IP routes
    if [[ $IP && $Routes ]]; then
        for route in "${Routes[@]}"; do
            if ! do_debug ip route add $route dev "$Interface"; then
                report_error "Could not add route '$route' to interface '$Interface'"
                return 1
            fi
        done
    fi

    # Load ipv6 module if necessary
    case "$IP6" in
      dhcp*|stateless|static)
        [[ -d "/proc/sys/net/ipv6" ]] || modprobe ipv6
      ;;
      no)
        [[ -d "/proc/sys/net/ipv6" ]] && sysctl -q -w "net.ipv6.conf.$interface_sysctl.accept_ra=0"
      ;;
      "")  # undefined IP6 does not prevent RA's from being received -> nop
      ;;
      *)
        report_error "IP6 must be 'dhcp', 'dhcp-noaddr', 'stateless', 'static' or 'no'"
        return 1
      ;;
    esac

    case "$IP6" in
      dhcp*)
        if ! type dhclient &>/dev/null; then
            report_error "You need to install dhclient to use DHCPv6"
            return 1
        fi
        sysctl -q -w "net.ipv6.conf.$interface_sysctl.accept_ra=1"
        [[ $IP6 == "dhcp-noaddr" ]] && Dhclient6Options+=" -S"
        rm -f "/run/dhclient6-${Interface}.pid"
        if ! do_debug dhclient -6 -q -e "TIMEOUT=${TimeoutDHCP:-10}" -pf "$Pidfile" $Dhclient6Options "$Interface"; then
            report_error "DHCPv6 IP lease attempt failed on interface '$Interface'"
            return 1
        fi
      ;;
      stateless)
        sysctl -q -w "net.ipv6.conf.$interface_sysctl.accept_ra=1"
      ;;
      static)
        sysctl -q -w "net.ipv6.conf.$interface_sysctl.accept_ra=0"
        if [[ -n $Address6 ]]; then
            for addr in "${Address6[@]}"; do
                if ! do_debug ip -6 addr add $addr dev "$Interface"; then
                    report_error "Could not add address '$addr' to interface '$Interface'"
                fi
            done
        fi
      ;;
    esac

    if [[ $IP6 ]]; then
        # Wait for Duplicate Address Detection to finish
        if ! timeout_wait "${TimeoutDAD:-3}" '[[ -z "$(ip -6 addr show dev "$Interface" tentative)" ]]'; then
            report_error "Duplicate Address Detection is taking too long on interface '$Interface'"
            return 1
        fi

        # Add static IPv6 routes
        if [[ $Routes6 ]]; then
            for route in "${Routes6[@]}"; do
                if ! do_debug ip -6 route add $route dev "$Interface"; then
                    report_error "Could not add route '$route' to interface '$Interface'"
                    return 1
                fi
            done
        fi

        # Set a custom gateway after DAD has finished
        if [[ $IP6 == "static" && $Gateway6 ]]; then
            if ! do_debug ip -6 route replace default via "$Gateway6" dev "$Interface"; then
                report_error "Could not set gateway '$Gateway6' on interface '$Interface'"
                return 1
            fi
        fi
    fi

    if [[ $IPCustom ]]; then
        for line in "${IPCustom[@]}"; do
            if ! do_debug ip $line; then
                report_error "Could not configure interface ($line)"
                return 1
            fi
        done
    fi

    if [[ $Hostname ]]; then
        if ! do_debug hostnamectl set-hostname "$Hostname"; then
            report_error "Cannot set the hostname to '$Hostname'"
            return 1
        fi
    fi

    if [[ $DNS ]]; then
        resolvconf_add "$Interface" \
                       "${DNSDomain/#/domain }" \
                       "${DNSSearch/#/search }" \
                       "${DNS[@]/#/nameserver }" \
                       "${DNSOptions[@]/#/options }"
    fi
}


## Clean up the dynamic part of an IP configuration
# $Interface: interface name
# $IP: type of IPv4 configuration
# $IP6: type of IPv6 configuration
ip_unset() {
    if [[ "$IP" == "dhcp" ]]; then
        case ${DHCPClient:-dhcpcd} in
          dhcpcd)
            if [[ -f "/run/dhcpcd-$Interface.pid" ]]; then
                do_debug dhcpcd -qk "$Interface" >/dev/null
            fi
          ;;
          dhclient)
            if [[ -f "/run/dhclient-$Interface.pid" ]]; then
                # Alternatively, use -r instead of -x to also release the lease
                do_debug dhclient -q -x "$Interface" -pf "/run/dhclient-$Interface.pid" >/dev/null
            fi
          ;;
        esac
    fi
    if [[ "$IP6" == dhcp* ]]; then
        if [[ -f "/run/dhclient6-$Interface.pid" ]]; then
            do_debug dhclient -6 -q -x "$Interface" -pf "/run/dhclient6-$Interface.pid" >/dev/null
        fi
    fi

    [[ $DNS ]] && resolvconf -d "$Interface"
}


# vim: ft=sh ts=4 et sw=4: