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server: Error out if loopback addr is used for Distributed Erasure (#4105)

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This commit is contained in:
Bala FA
2017-04-13 08:57:24 +05:30
committed by Harshavardhana
parent 6683247080
commit d103d5fb7c
2 changed files with 164 additions and 74 deletions
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cmd/endpoint.go
+45 -15
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@@ -305,9 +305,11 @@ func CreateEndpoints(serverAddr string, args ...string) (string, EndpointList, S
hostIPSet, _ := getHostIP4(host)
if IPSet, ok := pathIPMap[endpoint.Path]; ok {
if !IPSet.Intersection(hostIPSet).IsEmpty() {
err = fmt.Errorf("path '%s' can not be served from different address/port", endpoint.Path)
err = fmt.Errorf("path '%s' can not be served by different port on same address", endpoint.Path)
return serverAddr, endpoints, setupType, err
}
pathIPMap[endpoint.Path] = IPSet.Union(hostIPSet)
} else {
pathIPMap[endpoint.Path] = hostIPSet
}
@@ -327,21 +329,50 @@ func CreateEndpoints(serverAddr string, args ...string) (string, EndpointList, S
}
}
// If all endpoints are pointing to local host and having same port number, then this is XL setup using URL style endpoints.
if len(endpoints) == localEndpointCount && len(localPortSet) == 1 {
if len(localServerAddrSet) > 1 {
// TODO: Eventhough all endpoints are local, the local host is referred by different IP/name.
// eg '172.0.0.1', 'localhost' and 'mylocalhostname' point to same local host.
//
// In this case, we bind to 0.0.0.0 ie to all interfaces.
// The actual way to do is bind to only IPs in uniqueLocalHosts.
serverAddr = net.JoinHostPort("", serverAddrPort)
// All endpoints are pointing to local host
if len(endpoints) == localEndpointCount {
// If all endpoints have same port number, then this is XL setup using URL style endpoints.
if len(localPortSet) == 1 {
if len(localServerAddrSet) > 1 {
// TODO: Eventhough all endpoints are local, the local host is referred by different IP/name.
// eg '172.0.0.1', 'localhost' and 'mylocalhostname' point to same local host.
//
// In this case, we bind to 0.0.0.0 ie to all interfaces.
// The actual way to do is bind to only IPs in uniqueLocalHosts.
serverAddr = net.JoinHostPort("", serverAddrPort)
}
endpointPaths := endpointPathSet.ToSlice()
endpoints, _ = NewEndpointList(endpointPaths...)
setupType = XLSetupType
return serverAddr, endpoints, setupType, nil
}
endpointPaths := endpointPathSet.ToSlice()
endpoints, _ = NewEndpointList(endpointPaths...)
setupType = XLSetupType
return serverAddr, endpoints, setupType, nil
// Eventhough all endpoints are local, but those endpoints use different ports.
// This means it is DistXL setup.
} else {
// This is DistXL setup.
// Check whether local server address are not 127.x.x.x
for _, localServerAddr := range localServerAddrSet.ToSlice() {
host, _, err := net.SplitHostPort(localServerAddr)
if err != nil {
host = localServerAddr
}
ipList, err := getHostIP4(host)
fatalIf(err, "unexpected error when resolving host '%s'", host)
// Filter ipList by IPs those start with '127.'.
loopBackIPs := ipList.FuncMatch(func(ip string, matchString string) bool {
return strings.HasPrefix(ip, "127.")
}, "")
// If loop back IP is found and ipList contains only loop back IPs, then error out.
if len(loopBackIPs) > 0 && len(loopBackIPs) == len(ipList) {
err = fmt.Errorf("'%s' resolves to loopback address is not allowed for distributed XL", localServerAddr)
return serverAddr, endpoints, setupType, err
}
}
}
// Add missing port in all endpoints.
@@ -355,7 +386,6 @@ func CreateEndpoints(serverAddr string, args ...string) (string, EndpointList, S
}
}
// This is DistXL setup.
setupType = DistXLSetupType
return serverAddr, endpoints, setupType, nil
}