/usr/sbin/hv_set_ifconfig is in linux-cloud-tools-common 4.15.0-33.36.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 | #!/usr/bin/python3
#
# hv_set_ifconfig <config> -- take the hv_kvp_daemon generated configuration
# file and apply it to the Ubuntu configuration.
#
# CONFIG example:
# HWADDR=11:22:33:44:55:66
# DEVICE=foo1
# DHCP=yes
# CONFIG example:
# HWADDR=11:22:33:44:55:66
# DEVICE=foo1
# IPADDR=192.168.99.10
# GATEWAY=192.168.99.1
# DNS1=192.168.88.250
# IPADDR2=192.168.99.11
# IPV6ADDR=2001:DB8:99::10
# IPV6NETMASK=64
# IPV6_DEFAULTGW=2001:DB8:99::10
# set interfaces in hv_kvp_daemon style
import fileinput
import sys
import errno
import os
import shutil
import tempfile
import subprocess
if_filename="/etc/network/interfaces"
# Drop our output (XXX?)
sys.stdout = open(os.devnull, 'w')
sys.stderr = open(os.devnull, 'w')
# Confirm we can open the network configuration.
try:
if_file=open(if_filename,"r+")
except IOError as e:
exit(e.errno)
else:
if_file.close()
# Usage: hv_set_ifconfig <config>
if len(sys.argv) != 2 :
exit(errno.EINVAL)
#
# Here is the format of the ip configuration file:
#
# HWADDR=macaddr
# DEVICE=interface name
# BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
# or "none" if no boot-time protocol should be used)
#
# IPADDR0=ipaddr1
# IPADDR1=ipaddr2
# IPADDRx=ipaddry (where y = x + 1)
#
# NETMASK0=netmask1
# NETMASKx=netmasky (where y = x + 1)
#
# GATEWAY=ipaddr1
# GATEWAYx=ipaddry (where y = x + 1)
#
# DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
#
# IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
# tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
# IPV6NETMASK.
#
kvp=dict(line.strip().split("=") for line in fileinput.input())
# Setting the hwaddress to something azure is not expecting is fatal
# to networking.
if not "HWADDR" in kvp :
exit(errno.EPROTO)
# Confirm we have a device specified.
if not "DEVICE" in kvp :
exit(1)
autolist = []
output=[]
basename=kvp["DEVICE"]
# DNS entries will go with the first interface and there can be a max
# of three. These will be emitted with the first interface.
dns = []
for count in (1, 2, 3):
key = "DNS" + str(count)
if key in kvp:
dns += [kvp[key]]
dns_emitted = False
# IPV4 may either be dhcp or static.
if ("DHCP" in kvp and kvp["DHCP"] == "yes") or \
("BOOTPROTO" in kvp and kvp["BOOTPROTO"] == "dhcp"):
autolist.append(basename)
output += ["iface " + basename + " inet dhcp"]
output += [""]
else:
# Matchup the interface specific lines
# No real max for the number of interface + aliases ...
# only required is the address (but mate everything up that comes in.
# IPv4 -- ensure we sort by numeric suffixes.
v4names = [ int(name[6:]) for name in kvp.keys() if name.startswith("IPADDR") ]
v4names.sort()
for if_count in v4names:
ifname = basename
which = str(if_count)
if if_count:
ifname += ":" + str(if_count)
which_gw = which
else:
which_gw = ""
if not ifname in autolist:
autolist += [ifname]
output += [ "iface " + ifname + " inet static" ]
output += [ "\t" + "address " + kvp["IPADDR" + which] ]
if "NETMASK" + which in kvp:
output += [ "\tnetmask " + kvp["NETMASK" + which] ]
if "GATEWAY" + which_gw in kvp:
output += ["\tgateway " + kvp["GATEWAY" + which_gw]]
if not dns_emitted:
dns_emitted = True
output += ["\tdns-nameservers " + ' '.join(dns)]
output += [""]
# IPv6 requires a netmask
# If an ipv6 exists, you'll want to turn off /proc/sys/net/ipv6/conf/all/autoconf with
# echo 0 > /proc/sys/net/ipv6/conf/all/autoconf
v6names = [ int(name[8:]) for name in kvp.keys() if name.startswith("IPV6ADDR") ]
v6names.sort()
for if6_count in v6names:
ifname = basename
which = str(if6_count)
if if6_count:
ifname += ":" + str(if6_count)
which_gw = which
else:
which_gw = ""
if not ifname in autolist:
autolist += [ifname]
if "IPV6NETMASK" + which in kvp:
output += [ "iface " + ifname + " inet6 static"]
output += [ "\taddress " + kvp["IPV6ADDR" + which]]
output += [ "\tnetmask " + kvp["IPV6NETMASK" + which]]
if "IPV6_DEFAULTGW" + which_gw in kvp:
output += [ "\tgateway " + kvp["IPV6_DEFAULTGW" + which_gw] ]
if not dns_emitted:
dns_emitted = True
output += ["\tdns-nameservers " + ' '.join(dns)]
output += [""]
# Mark this new interface for automatic up.
if len(autolist):
output = ["auto "+" ".join(autolist)] + output
print("===================================")
print(output)
print("===================================")
# Time to clean out the existing interface file
# Markers.
start_mark = "# The following stanza(s) added by hv_set_ifconfig"
end_mark = "#End of hv_set_ifconfig stanzas"
f=open(if_filename,"r")
flines=f.readlines()
f.close()
newfile=[]
pitchstanza=0
inastanza=0
stanza=[]
prev_line=None
for line in flines:
if line.startswith("auto"):
if inastanza:
if not pitchstanza:
newfile.extend(stanza)
stanza=[]
inastanza=0
newline=""
autoline=line.strip().split(" ")
for word in autoline:
if (not word == basename) and (not word.startswith(basename+":")):
newline+=word + " "
newline = newline.strip()
if not newline == "auto":
newfile += [newline.strip()]
elif line.startswith(("iface","mapping","source")):
'''Read a stanza'''
'''A Stanza can also start with allow- ie allow-hotplug'''
if inastanza:
if not pitchstanza:
newfile.extend(stanza)
stanza=[]
inastanza=1
pitchstanza=0
autoline=line.strip().split(" ")
for word in autoline:
if (word == basename) or (word.startswith(basename+":")):
pitchstanza=1
if not pitchstanza:
stanza+=[line.strip()]
elif line.strip() in (start_mark, end_mark):
if inastanza:
if not pitchstanza:
newfile.extend(stanza)
stanza=[]
inastanza = 0
pitchstanza = 0
# Deduplicate markers.
if line != prev_line:
newfile += [line.strip()]
else:
if inastanza:
if not pitchstanza:
stanza+=[line.strip()]
else:
if not pitchstanza:
newfile += [line.strip()]
prev_line=line
# Include pending stanza if any.
if inastanza and not pitchstanza:
newfile.extend(stanza)
def emit(line):
print(line)
output = line + "\n"
os.write(fd, output.encode('utf-8'))
# Insert the new output at the end and inside the existing markers if found.
emitted = False
fd, path = tempfile.mkstemp()
for line in newfile:
if line == end_mark:
emit("\n".join(output))
emitted = True
emit(line)
if not emitted:
emit(start_mark)
emit("\n".join(output))
emit(end_mark)
os.close(fd)
shutil.copy(path,if_filename)
os.chmod(if_filename,0o644)
#print("TMPFILE is at: " + path)
#print("Copied file is at: " + if_filename)
try:
retcode = subprocess.call("ifdown "+basename , shell=True)
if retcode < 0:
print("Child was terminated by signal", -retcode, file=sys.stderr)
else:
print("Child returned", retcode, file=sys.stderr)
except OSError as e:
print("Execution failed:", e, file=sys.stderr)
try:
retcode = subprocess.call("ifup "+basename , shell=True)
if retcode < 0:
print("Child was terminated by signal", -retcode, file=sys.stderr)
else:
print("Child returned", retcode, file=sys.stderr)
except OSError as e:
print("Execution failed:", e, file=sys.stderr)
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