/usr/sbin/hv_set_ifconfig is in linux-cloud-tools-common 3.13.0-30.55.
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 | #! /usr/bin/env python
# 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"
'''Get quiet'''
sys.stdout = open(os.devnull, 'w')
sys.stderr = open(os.devnull, 'w')
try:
if_file=open(if_filename,"r+")
except IOError as e:
exit(e.errno)
else:
if_file.close()
def kvp_dict(file):
return dict(line.strip().split("=") for line in file)
#setting the hwaddress to something azure is not expecting is fatal networking
if len(sys.argv) != 2 :
exit(errno.EINVAL)
kvp=dict(line.strip().split("=") for line in fileinput.input())
if not "HWADDR" in kvp :
exit(errno.EPROTO)
if not "DEVICE" in kvp :
exit(1)
output=[]
basename=kvp["DEVICE"]
if "DHCP" in kvp and kvp["DHCP"]=="yes" :
output += ["auto " + basename]
output += ["iface " + basename + " inet dhcp"]
output += [""]
else:
''' Matchup the interface specific lines '''
'''DNS entries will go with the first interface
and there can be a max of three'''
autolist=[]
dns=[]
if "DNS1" in kvp :
dns+=[kvp["DNS1"]]
if "DNS2" in kvp :
dns+=[kvp["DNS2"]]
if "DNS3" in kvp :
dns+=[kvp["DNS3"]]
'''
No real max for the number of interface + aliases ...
only required is the address (but mate everything up that comes in. '''
'''ipv4 first'''
v4names=[name for name in kvp.keys() if name.startswith("IPADDR")]
v4names.sort()
v6names=[name for name in kvp.keys() if name.startswith("IPV6ADDR")]
v6names.sort()
'''IPV6 requires a netmask'''
'''If an ipv6 exists, you'll want to turn off /proc/sys/net/ipv6/conf/all/autoconf with
up echo 0 > /proc/sys/net/ipv6/conf/all/autoconf'''
'''Counter needs to increment as soon as any interface is set.'''
if_count=0
for v4 in v4names:
ifname=basename
suffix=""
if if_count :
ifname+=":" + str(if_count)
suffix="_"+str(if_count)
if not ifname in autolist:
autolist += [ifname]
output += [ "iface " + ifname + " inet static"]
output += [ "\t" + "address " + kvp[v4]]
if "NETMASK"+suffix in kvp.keys():
output += ["\tnetmask " + kvp["NETMASK"+suffix]]
if "GATEWAY"+suffix in kvp.keys():
output += ["\tgateway " + kvp["GATEWAY"+suffix]]
if not if_count :
output += ["\tdns-nameservers " + ' '.join(dns)]
output += [""]
if_count+=1
if6_count=0
if6_used=0
for v6 in v6names:
ifname=basename
suffix=""
if if6_used :
ifname+=":" + str(if6_used)
if if6_count :
suffix="_" + str(if6_count)
if not ifname in autolist:
autolist += [ifname]
if "IPV6NETMASK"+suffix in kvp.keys():
output += [ "iface " + ifname + " inet6 static"]
output += [ "\taddress " + kvp[v6]]
output += [ "\tnetmask " + kvp["IPV6NETMASK"+suffix]]
if "IPV6_DEFAULTGW"+suffix in kvp.keys():
output += [ "\tgateway " + kvp["IPV6_DEFAULTGW"+suffix] ]
if not if_count :
output += ["\tdns-nameservers " + ' '.join(dns)]
output += [""]
if_count += 1
if6_used += 1
if6_count += 1
output = ["auto "+" ".join(autolist)] + output
output=["# The following stanza(s) added by hv_set_ifconfig"] + output
output+=["#End of hv_set_ifconfig stanzas"]
print "==================================="
print output
print "==================================="
''' Time to clean out the existing interface file'''
f=open(if_filename,"r")
flines=f.readlines()
f.close()
newfile=[]
pitchstanza=0
inastanza=0
stanza=[]
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()]
else:
if inastanza:
if not pitchstanza:
stanza+=[line.strip()]
else:
if not pitchstanza:
newfile += [line.strip()]
for line in newfile:
print line
for line in output:
print line
fd, path = tempfile.mkstemp()
for line in newfile:
os.write(fd,line)
os.write(fd,"\n")
for line in output:
os.write(fd,line)
os.write(fd,"\n")
os.close(fd)
shutil.copy(path,if_filename)
os.chmod(if_filename,0644)
#print "TMPFILE is at: " + path
#print "Copied file is at: " + if_filename
try:
retcode = subprocess.call("ifdown "+basename , shell=True)
if retcode < 0:
print >>sys.stderr, "Child was terminated by signal", -retcode
else:
print >>sys.stderr, "Child returned", retcode
except OSError as e:
print >>sys.stderr, "Execution failed:", e
try:
retcode = subprocess.call("ifup "+basename , shell=True)
if retcode < 0:
print >>sys.stderr, "Child was terminated by signal", -retcode
else:
print >>sys.stderr, "Child returned", retcode
except OSError as e:
print >>sys.stderr, "Execution failed:", e
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