DHCP: ARP issue, FR2.x vs FR 3.x
I'm trying to test a simple DHCP server implementation using FR. The setup: - server is using dummy1 interface for dhcp server test purposes, IP 172.16.101.1 - client is using virtualbox running on server, with client's eth0 bridged to server's dummy1, tested using client's "dhclient" command. - basic DHCP test using dnsmasq and FR 3 (with freeradius -X) on server works fine, so there's no issue about using dummy interface and virtualbox. Then I test FR 2.2.0 (from v2.1.x git). The dhcp listen section is different, so I adusted it accordingly. But there seems to be a problem with arp, and the reply never recached the client (also confirmed with tcpdump). Any idea how to make FR2's DHCP work, or at least behaves similar to FR3? FR2 debug log: #=========================================================================== root@HP:/# freeradius -X FreeRADIUS Version 2.2.0, for host i686-pc-linux-gnu, built on Jan 11 2012 at 17:20:48 Copyright (C) 1999-2009 The FreeRADIUS server project and contributors. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You may redistribute copies of FreeRADIUS under the terms of the GNU General Public License v2. Starting - reading configuration files ... including configuration file /etc/freeradius/radiusd.conf including configuration file /etc/freeradius/proxy.conf including configuration file /etc/freeradius/clients.conf including files in directory /etc/freeradius/modules/ including configuration file /etc/freeradius/modules/radutmp including configuration file /etc/freeradius/modules/realm including configuration file /etc/freeradius/modules/detail.log including configuration file /etc/freeradius/modules/linelog including configuration file /etc/freeradius/modules/rediswho including configuration file /etc/freeradius/modules/krb5 including configuration file /etc/freeradius/modules/expr including configuration file /etc/freeradius/modules/cui including configuration file /etc/freeradius/modules/replicate including configuration file /etc/freeradius/modules/sradutmp including configuration file /etc/freeradius/modules/checkval including configuration file /etc/freeradius/modules/digest including configuration file /etc/freeradius/modules/policy including configuration file /etc/freeradius/modules/unix including configuration file /etc/freeradius/modules/opendirectory including configuration file /etc/freeradius/modules/counter including configuration file /etc/freeradius/modules/perl including configuration file /etc/freeradius/modules/chap including configuration file /etc/freeradius/modules/redis including configuration file /etc/freeradius/modules/attr_filter including configuration file /etc/freeradius/modules/ntlm_auth including configuration file /etc/freeradius/modules/mac2ip including configuration file /etc/freeradius/modules/files including configuration file /etc/freeradius/modules/etc_group including configuration file /etc/freeradius/modules/expiration including configuration file /etc/freeradius/modules/smsotp including configuration file /etc/freeradius/modules/exec including configuration file /etc/freeradius/modules/acct_unique including configuration file /etc/freeradius/modules/ippool including configuration file /etc/freeradius/modules/detail.example.com including configuration file /etc/freeradius/modules/inner-eap including configuration file /etc/freeradius/modules/pap including configuration file /etc/freeradius/modules/wimax including configuration file /etc/freeradius/modules/mschap including configuration file /etc/freeradius/modules/pam including configuration file /etc/freeradius/modules/smbpasswd including configuration file /etc/freeradius/modules/otp including configuration file /etc/freeradius/modules/echo including configuration file /etc/freeradius/modules/sql_log including configuration file /etc/freeradius/modules/soh including configuration file /etc/freeradius/modules/ldap including configuration file /etc/freeradius/modules/preprocess including configuration file /etc/freeradius/modules/always including configuration file /etc/freeradius/modules/mac2vlan including configuration file /etc/freeradius/modules/sqlcounter_expire_on_login including configuration file /etc/freeradius/modules/attr_rewrite including configuration file /etc/freeradius/modules/logintime including configuration file /etc/freeradius/modules/dynamic_clients including configuration file /etc/freeradius/modules/detail including configuration file /etc/freeradius/modules/passwd including configuration file /etc/freeradius/modules/radrelay including configuration file /etc/freeradius/eap.conf including configuration file /etc/freeradius/policy.conf including files in directory /etc/freeradius/sites-enabled/ including configuration file /etc/freeradius/sites-enabled/default including configuration file /etc/freeradius/sites-enabled/inner-tunnel including configuration file /etc/freeradius/sites-enabled/dhcp main { user = "freerad" group = "freerad" allow_core_dumps = no } including dictionary file /etc/freeradius/dictionary main { name = "freeradius" prefix = "/usr" localstatedir = "/var" sbindir = "/usr/sbin" logdir = "/var/log/freeradius" run_dir = "/var/run/freeradius" libdir = "/usr/lib/freeradius" radacctdir = "/var/log/freeradius/radacct" hostname_lookups = no max_request_time = 30 cleanup_delay = 5 max_requests = 1024 pidfile = "/var/run/freeradius/freeradius.pid" checkrad = "/usr/sbin/checkrad" debug_level = 0 proxy_requests = yes log { stripped_names = no auth = no auth_badpass = no auth_goodpass = no } security { max_attributes = 200 reject_delay = 1 status_server = yes } } radiusd: #### Loading Realms and Home Servers #### proxy server { retry_delay = 5 retry_count = 3 default_fallback = no dead_time = 120 wake_all_if_all_dead = no } home_server localhost { ipaddr = 127.0.0.1 port = 1812 type = "auth" secret = "testing123" response_window = 20 max_outstanding = 65536 require_message_authenticator = yes zombie_period = 40 status_check = "status-server" ping_interval = 30 check_interval = 30 num_answers_to_alive = 3 num_pings_to_alive = 3 revive_interval = 120 status_check_timeout = 4 coa { irt = 2 mrt = 16 mrc = 5 mrd = 30 } } home_server_pool my_auth_failover { type = fail-over home_server = localhost } realm example.com { auth_pool = my_auth_failover } realm LOCAL { } radiusd: #### Loading Clients #### client localhost { ipaddr = 127.0.0.1 require_message_authenticator = no secret = "testing123" nastype = "other" } radiusd: #### Instantiating modules #### instantiate { Module: Linked to module rlm_exec Module: Instantiating module "exec" from file /etc/freeradius/modules/exec exec { wait = no input_pairs = "request" shell_escape = yes } Module: Linked to module rlm_expr Module: Instantiating module "expr" from file /etc/freeradius/modules/expr Module: Linked to module rlm_expiration Module: Instantiating module "expiration" from file /etc/freeradius/modules/expiration expiration { reply-message = "Password Has Expired " } Module: Linked to module rlm_logintime Module: Instantiating module "logintime" from file /etc/freeradius/modules/logintime logintime { reply-message = "You are calling outside your allowed timespan " minimum-timeout = 60 } } radiusd: #### Loading Virtual Servers #### server { # from file /etc/freeradius/radiusd.conf modules { Module: Creating Auth-Type = digest Module: Creating Post-Auth-Type = REJECT Module: Checking authenticate {...} for more modules to load Module: Linked to module rlm_pap Module: Instantiating module "pap" from file /etc/freeradius/modules/pap pap { encryption_scheme = "auto" auto_header = no } Module: Linked to module rlm_chap Module: Instantiating module "chap" from file /etc/freeradius/modules/chap Module: Linked to module rlm_mschap Module: Instantiating module "mschap" from file /etc/freeradius/modules/mschap mschap { use_mppe = yes require_encryption = no require_strong = no with_ntdomain_hack = no allow_retry = yes } Module: Linked to module rlm_digest Module: Instantiating module "digest" from file /etc/freeradius/modules/digest Module: Linked to module rlm_unix Module: Instantiating module "unix" from file /etc/freeradius/modules/unix unix { radwtmp = "/var/log/freeradius/radwtmp" } Module: Linked to module rlm_eap Module: Instantiating module "eap" from file /etc/freeradius/eap.conf eap { default_eap_type = "md5" timer_expire = 60 ignore_unknown_eap_types = no cisco_accounting_username_bug = no max_sessions = 4096 } Module: Linked to sub-module rlm_eap_md5 Module: Instantiating eap-md5 Module: Linked to sub-module rlm_eap_leap Module: Instantiating eap-leap Module: Linked to sub-module rlm_eap_gtc Module: Instantiating eap-gtc gtc { challenge = "Password: " auth_type = "PAP" } Module: Linked to sub-module rlm_eap_tls Module: Instantiating eap-tls tls { rsa_key_exchange = no dh_key_exchange = yes rsa_key_length = 512 dh_key_length = 512 verify_depth = 0 CA_path = "/etc/freeradius/certs" pem_file_type = yes private_key_file = "/etc/freeradius/certs/server.key" certificate_file = "/etc/freeradius/certs/server.pem" CA_file = "/etc/freeradius/certs/ca.pem" private_key_password = "whatever" dh_file = "/etc/freeradius/certs/dh" random_file = "/dev/urandom" fragment_size = 1024 include_length = yes check_crl = no cipher_list = "DEFAULT" make_cert_command = "/etc/freeradius/certs/bootstrap" ecdh_curve = "prime256v1" cache { enable = no lifetime = 24 max_entries = 255 } verify { } ocsp { enable = no override_cert_url = yes url = "http://127.0.0.1/ocsp/" } } Module: Linked to sub-module rlm_eap_ttls Module: Instantiating eap-ttls ttls { default_eap_type = "md5" copy_request_to_tunnel = no use_tunneled_reply = no virtual_server = "inner-tunnel" include_length = yes } Module: Linked to sub-module rlm_eap_peap Module: Instantiating eap-peap peap { default_eap_type = "mschapv2" copy_request_to_tunnel = no use_tunneled_reply = no proxy_tunneled_request_as_eap = yes virtual_server = "inner-tunnel" soh = no } Module: Linked to sub-module rlm_eap_mschapv2 Module: Instantiating eap-mschapv2 mschapv2 { with_ntdomain_hack = no send_error = no } Module: Checking authorize {...} for more modules to load Module: Linked to module rlm_preprocess Module: Instantiating module "preprocess" from file /etc/freeradius/modules/preprocess preprocess { huntgroups = "/etc/freeradius/huntgroups" hints = "/etc/freeradius/hints" with_ascend_hack = no ascend_channels_per_line = 23 with_ntdomain_hack = no with_specialix_jetstream_hack = no with_cisco_vsa_hack = no with_alvarion_vsa_hack = no } Module: Linked to module rlm_realm Module: Instantiating module "suffix" from file /etc/freeradius/modules/realm realm suffix { format = "suffix" delimiter = "@" ignore_default = no ignore_null = no } Module: Linked to module rlm_files Module: Instantiating module "files" from file /etc/freeradius/modules/files files { usersfile = "/etc/freeradius/users" acctusersfile = "/etc/freeradius/acct_users" preproxy_usersfile = "/etc/freeradius/preproxy_users" compat = "no" } Module: Checking preacct {...} for more modules to load Module: Linked to module rlm_acct_unique Module: Instantiating module "acct_unique" from file /etc/freeradius/modules/acct_unique acct_unique { key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port" } Module: Checking accounting {...} for more modules to load Module: Linked to module rlm_detail Module: Instantiating module "detail" from file /etc/freeradius/modules/detail detail { detailfile = "/var/log/freeradius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Address}}/detail-%Y%m%d" header = "%t" detailperm = 384 dirperm = 493 locking = no log_packet_header = no } Module: Linked to module rlm_radutmp Module: Instantiating module "radutmp" from file /etc/freeradius/modules/radutmp radutmp { filename = "/var/log/freeradius/radutmp" username = "%{User-Name}" case_sensitive = yes check_with_nas = yes perm = 384 callerid = yes } Module: Linked to module rlm_attr_filter Module: Instantiating module "attr_filter.accounting_response" from file /etc/freeradius/modules/attr_filter attr_filter attr_filter.accounting_response { attrsfile = "/etc/freeradius/attrs.accounting_response" key = "%{User-Name}" relaxed = no } Module: Checking session {...} for more modules to load Module: Checking post-proxy {...} for more modules to load Module: Checking post-auth {...} for more modules to load Module: Instantiating module "attr_filter.access_reject" from file /etc/freeradius/modules/attr_filter attr_filter attr_filter.access_reject { attrsfile = "/etc/freeradius/attrs.access_reject" key = "%{User-Name}" relaxed = no } } # modules } # server server inner-tunnel { # from file /etc/freeradius/sites-enabled/inner-tunnel modules { Module: Checking authenticate {...} for more modules to load Module: Checking authorize {...} for more modules to load Module: Checking session {...} for more modules to load Module: Checking post-proxy {...} for more modules to load Module: Checking post-auth {...} for more modules to load } # modules } # server server dhcp { # from file /etc/freeradius/sites-enabled/dhcp modules { Module: Checking dhcp DHCP-Discover {...} for more modules to load Module: Linked to module rlm_passwd Module: Instantiating module "mac2ip" from file /etc/freeradius/modules/mac2ip passwd mac2ip { filename = "/etc/freeradius/mac2ip" format = "*DHCP-Client-Hardware-Address:=DHCP-Your-IP-Address" delimiter = "," ignorenislike = yes ignoreempty = yes allowmultiplekeys = no hashsize = 100 } rlm_passwd: nfields: 2 keyfield 0(DHCP-Client-Hardware-Address) listable: no Module: Linked to module rlm_always Module: Instantiating module "ok" from file /etc/freeradius/modules/always always ok { rcode = "ok" simulcount = 0 mpp = no } Module: Checking dhcp DHCP-Request {...} for more modules to load Module: Checking dhcp (null) {...} for more modules to load /etc/freeradius/sites-enabled/dhcp[237]: No name specified for Post-Auth-Type block } # modules } # server radiusd: #### Opening IP addresses and Ports #### listen { type = "auth" ipaddr = * port = 0 } listen { type = "acct" ipaddr = * port = 0 } listen { type = "auth" ipaddr = 127.0.0.1 port = 18120 } listen { type = "dhcp" ipaddr = 255.255.255.255 port = 67 interface_ipaddr = 172.16.101.1 } listen { type = "dhcp" ipaddr = 172.16.101.1 port = 67 } ... adding new socket proxy address * port 49208 Listening on authentication address * port 1812 Listening on accounting address * port 1813 Listening on authentication address 127.0.0.1 port 18120 as server inner-tunnel Listening on dhcp interface dummy1 address 255.255.255.255 port 67 as server dhcp Listening on dhcp address 172.16.101.1 port 67 as server dhcp Listening on proxy address * port 1814 Ready to process requests. Received DHCP-Discover of id 3ecf5c31 from 0.0.0.0:68 to 255.255.255.255:67 DHCP-Opcode = Client-Message DHCP-Hardware-Type = Ethernet DHCP-Hardware-Address-Length = 6 DHCP-Hop-Count = 0 DHCP-Transaction-Id = 1053776945 DHCP-Number-of-Seconds = 0 DHCP-Flags = 0 DHCP-Client-IP-Address = 0.0.0.0 DHCP-Your-IP-Address = 0.0.0.0 DHCP-Server-IP-Address = 0.0.0.0 DHCP-Gateway-IP-Address = 0.0.0.0 DHCP-Client-Hardware-Address = 08:00:27:a2:13:b9 DHCP-Message-Type = DHCP-Discover DHCP-Parameter-Request-List = DHCP-Subnet-Mask DHCP-Parameter-Request-List = DHCP-Broadcast-Address DHCP-Parameter-Request-List = DHCP-Time-Offset DHCP-Parameter-Request-List = DHCP-Router-Address DHCP-Parameter-Request-List = DHCP-Domain-Name DHCP-Parameter-Request-List = DHCP-Domain-Name-Server DHCP-Parameter-Request-List = DHCP-Hostname DHCP-Parameter-Request-List = DHCP-NTP-Servers server dhcp { Trying sub-section dhcp DHCP-Discover {...} +- entering group DHCP-Discover {...} ++[reply] returns noop ++[reply] returns noop [mac2ip] Added DHCP-Your-IP-Address: '172.16.101.101' to reply_items ++[mac2ip] returns ok ++[ok] returns ok } # server dhcp DHCP-Subnet-Mask = 255.255.255.0 DHCP-Router-Address = 172.16.101.1 DHCP-Domain-Name-Server = 8.8.8.8 DHCP-IP-Address-Lease-Time = 60 DHCP-DHCP-Server-Identifier = 172.16.101.1 Sending DHCP-Offer of id 3ecf5c31 from 172.16.101.1:67 to 172.16.101.101:68 Finished request 0. Cleaning up request 0 ID 1053776945 with timestamp +12 Going to the next request Ready to process requests. Received DHCP-Discover of id 3ecf5c31 from 0.0.0.0:68 to 255.255.255.255:67 DHCP-Opcode = Client-Message DHCP-Hardware-Type = Ethernet DHCP-Hardware-Address-Length = 6 DHCP-Hop-Count = 0 DHCP-Transaction-Id = 1053776945 DHCP-Number-of-Seconds = 4 DHCP-Flags = 0 DHCP-Client-IP-Address = 0.0.0.0 DHCP-Your-IP-Address = 0.0.0.0 DHCP-Server-IP-Address = 0.0.0.0 DHCP-Gateway-IP-Address = 0.0.0.0 DHCP-Client-Hardware-Address = 08:00:27:a2:13:b9 DHCP-Message-Type = DHCP-Discover DHCP-Parameter-Request-List = DHCP-Subnet-Mask DHCP-Parameter-Request-List = DHCP-Broadcast-Address DHCP-Parameter-Request-List = DHCP-Time-Offset DHCP-Parameter-Request-List = DHCP-Router-Address DHCP-Parameter-Request-List = DHCP-Domain-Name DHCP-Parameter-Request-List = DHCP-Domain-Name-Server DHCP-Parameter-Request-List = DHCP-Hostname DHCP-Parameter-Request-List = DHCP-NTP-Servers server dhcp { Trying sub-section dhcp DHCP-Discover {...} +- entering group DHCP-Discover {...} ++[reply] returns noop ++[reply] returns noop [mac2ip] Added DHCP-Your-IP-Address: '172.16.101.101' to reply_items ++[mac2ip] returns ok ++[ok] returns ok } # server dhcp DHCP-Subnet-Mask = 255.255.255.0 DHCP-Router-Address = 172.16.101.1 DHCP-Domain-Name-Server = 8.8.8.8 DHCP-IP-Address-Lease-Time = 60 DHCP-DHCP-Server-Identifier = 172.16.101.1 Sending DHCP-Offer of id 3ecf5c31 from 172.16.101.1:67 to 172.16.101.101:68 Finished request 1. Cleaning up request 1 ID 1053776945 with timestamp +16 Going to the next request Ready to process requests. #=========================================================================== tcpdump output from the server #=========================================================================== 15:39:47.611809 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 15:39:47.611830 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 15:39:47.616432 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 15:39:48.616525 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 15:39:49.616483 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 15:39:51.613941 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, secs 4, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 15:39:51.613964 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x3ecf5c31, secs 4, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 15:39:51.616438 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 15:39:52.616460 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 15:39:53.616516 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 #=========================================================================== -- Fajar
Fajar A. Nugraha wrote:
I'm trying to test a simple DHCP server implementation using FR. The setup: - server is using dummy1 interface for dhcp server test purposes, IP 172.16.101.1 - client is using virtualbox running on server, with client's eth0 bridged to server's dummy1, tested using client's "dhclient" command. - basic DHCP test using dnsmasq and FR 3 (with freeradius -X) on server works fine, so there's no issue about using dummy interface and virtualbox.
Then I test FR 2.2.0 (from v2.1.x git).
Nope. You're still using an older version. Commit 18f56d3e5e in the v2.1.x branch renamed some of the new DHCP configuration items, and added documentation describing them. The dhcp listen section is
different, so I adusted it accordingly. But there seems to be a problem with arp, and the reply never recached the client (also confirmed with tcpdump). Any idea how to make FR2's DHCP work, or at least behaves similar to FR3?
See raddb/sites-available/dhcp. Look for "src_interface". It *should* be using that field to update the ARP table. If you don't set it, it *should* use the "interface" field. When the code updates the ARP cache, it *should* print an error saying so, and then not send the packet. Alan DeKok.
On Fri, Jan 13, 2012 at 5:09 PM, Alan DeKok <aland@deployingradius.com> wrote:
Fajar A. Nugraha wrote:
Then I test FR 2.2.0 (from v2.1.x git).
Nope. You're still using an older version.
I should've said "from v2.1.x when I started trying to test debian packages" :P
Commit 18f56d3e5e in the v2.1.x branch renamed some of the new DHCP configuration items, and added documentation describing them.
See raddb/sites-available/dhcp. Look for "src_interface". It *should* be using that field to update the ARP table. If you don't set it, it *should* use the "interface" field. When the code updates the ARP cache, it *should* print an error saying so, and then not send the packet.
Thanks, will try again shortly. -- Fajar
On Fri, Jan 13, 2012 at 6:44 PM, Fajar A. Nugraha <list@fajar.net> wrote:
On Fri, Jan 13, 2012 at 5:09 PM, Alan DeKok <aland@deployingradius.com> wrote:
See raddb/sites-available/dhcp. Look for "src_interface". It *should* be using that field to update the ARP table. If you don't set it, it *should* use the "interface" field. When the code updates the ARP cache, it *should* print an error saying so, and then not send the packet.
Thanks, will try again shortly.
The change seems to be incomplete. Updated up to commit 94ca2f1. First, there's a build error caused by commit 6021a5e. "Fixing" it is simple enough. diff --git a/src/main/dhcpd.c b/src/main/dhcpd.c index 5dae88d..6424c4c 100644 --- a/src/main/dhcpd.c +++ b/src/main/dhcpd.c @@ -484,7 +484,7 @@ static int dhcp_socket_parse(CONF_SECTION *cs, rad_listen_t *this) &sock->suppress_responses, NULL); } - if (!sock->src_interface) sock->src_interface = strdup(sock->interface) + if (!sock->src_interface) sock->src_interface = strdup(sock->interface); cp = cf_pair_find(cs, "src_interface"); if (cp) { At least it builds with that. But then trying dhcp with the default sites-available/dhcp, with minimal changes (lo0 -> lo, comment out first listen block which is for non-linux) resulted this debug log: ... server dhcp { # from file /etc/freeradius/sites-enabled/dhcp modules { } # modules } # server WARNING: Server dhcp is empty, and will do nothing! radiusd: #### Opening IP addresses and Ports #### listen { type = "auth" ipaddr = * port = 0 } listen { type = "acct" ipaddr = * port = 0 } listen { type = "auth" ipaddr = 127.0.0.1 port = 18120 } listen { type = "dhcp" ipaddr = 255.255.255.255 port = 6700 src_ipaddr = 127.0.0.1 } listen { type = "dhcp" ipaddr = 127.0.0.1 port = 6700 Segmentation fault The "WARNING: Server dhcp is empty, and will do nothing!" is particulary suspicious. And gdb doesn't reveal much either Program received signal SIGSEGV, Segmentation fault. 0xf7cb3db1 in ?? () from /lib/i386-linux-gnu/libc.so.6 (gdb) bt #0 0xf7cb3db1 in ?? () from /lib/i386-linux-gnu/libc.so.6 #1 0xf7cb3a95 in strdup () from /lib/i386-linux-gnu/libc.so.6 #2 0x0805a77b in ?? () #3 0x0805e9a8 in ?? () #4 0x0805f165 in listen_init () #5 0x0807376f in radius_event_init () #6 0x08066f2f in main () (gdb) Retried with previous dhcp config (the one I used eariler) still display that warning (although this one doesn't segfault), so something is probably broken in config parsing code (thus "Server dhcp is empty"), and something else related to src_interface (since the debug output seems to stop just before that, and the old config which doesn't use src_interface loads without segfault). ... or it could simply be that my build "fix" is completely incorrect :) -- Fajar
Fajar A. Nugraha wrote:
First, there's a build error caused by commit 6021a5e. "Fixing" it is simple enough.
I've pushed a fix, which also fixes the other error.
The "WARNING: Server dhcp is empty, and will do nothing!" is particulary suspicious.
It's just that there are no *modules* in the server. Just "unlang".
And gdb doesn't reveal much either
Program received signal SIGSEGV, Segmentation fault. 0xf7cb3db1 in ?? () from /lib/i386-linux-gnu/libc.so.6 (gdb) bt #0 0xf7cb3db1 in ?? () from /lib/i386-linux-gnu/libc.so.6 #1 0xf7cb3a95 in strdup () from /lib/i386-linux-gnu/libc.so.6
Arg. "interface" isn't set. I've fixed that.
Retried with previous dhcp config (the one I used eariler) still display that warning (although this one doesn't segfault), so something is probably broken in config parsing code (thus "Server dhcp is empty"), and something else related to src_interface (since the debug output seems to stop just before that, and the old config which doesn't use src_interface loads without segfault).
... or it could simply be that my build "fix" is completely incorrect :)
No. Alan DeKok.
On Fri, Jan 13, 2012 at 8:48 PM, Alan DeKok <aland@deployingradius.com> wrote:
Arg. "interface" isn't set. I've fixed that.
Yep, that fixed the segfault issue alright :D There's still problems though. First, while migrating my old test config, I forgot to uncomment mac2ip, which means there are no DHCP-Your-IP-Address attribute. When it receive dhcp discover packet, the server died with #================================================================ server dhcp { Trying sub-section dhcp DHCP-Discover {...} +- entering group DHCP-Discover {...} ++[reply] returns noop ++[reply] returns noop ++[ok] returns ok ASSERT FAILED dhcpd.c[412]: vp != NULL Aborted #================================================================ I don't think it should do that. Second, there's still no packet sent to the client. And there's nothing in the debug log about updating ARP cache. FR debug log (starting from dhcp section): #================================================================ server dhcp { # from file /etc/freeradius/sites-enabled/dhcp modules { Module: Checking dhcp DHCP-Discover {...} for more modules to load Module: Linked to module rlm_passwd Module: Instantiating module "mac2ip" from file /etc/freeradius/modules/mac2ip passwd mac2ip { filename = "/etc/freeradius/mac2ip" format = "*DHCP-Client-Hardware-Address:=DHCP-Your-IP-Address" delimiter = "," ignorenislike = yes ignoreempty = yes allowmultiplekeys = no hashsize = 100 } rlm_passwd: nfields: 2 keyfield 0(DHCP-Client-Hardware-Address) listable: no Module: Linked to module rlm_always Module: Instantiating module "ok" from file /etc/freeradius/modules/always always ok { rcode = "ok" simulcount = 0 mpp = no } Module: Checking dhcp DHCP-Request {...} for more modules to load Module: Checking dhcp (null) {...} for more modules to load /etc/freeradius/sites-enabled/dhcp[243]: No name specified for Post-Auth-Type block } # modules } # server radiusd: #### Opening IP addresses and Ports #### listen { type = "auth" ipaddr = * port = 0 } listen { type = "acct" ipaddr = * port = 0 } listen { type = "auth" ipaddr = 127.0.0.1 port = 18120 } listen { type = "dhcp" ipaddr = 255.255.255.255 port = 67 src_ipaddr = 172.16.101.1 } listen { type = "dhcp" ipaddr = 172.16.101.1 port = 67 WARNING: No "interface" setting is defined. Only unicast DHCP will work. src_interface = "dummy1" } ... adding new socket proxy address * port 48701 Listening on authentication address * port 1812 Listening on accounting address * port 1813 Listening on authentication address 127.0.0.1 port 18120 as server inner-tunnel Listening on dhcp interface dummy1 address 255.255.255.255 port 67 as server dhcp Listening on dhcp address 172.16.101.1 port 67 as server dhcp Listening on proxy address * port 1814 Ready to process requests. Received DHCP-Discover of id 90df5d69 from 0.0.0.0:68 to 255.255.255.255:67 DHCP-Opcode = Client-Message DHCP-Hardware-Type = Ethernet DHCP-Hardware-Address-Length = 6 DHCP-Hop-Count = 0 DHCP-Transaction-Id = 2430557545 DHCP-Number-of-Seconds = 0 DHCP-Flags = 0 DHCP-Client-IP-Address = 0.0.0.0 DHCP-Your-IP-Address = 0.0.0.0 DHCP-Server-IP-Address = 0.0.0.0 DHCP-Gateway-IP-Address = 0.0.0.0 DHCP-Client-Hardware-Address = 08:00:27:a2:13:b9 DHCP-Message-Type = DHCP-Discover DHCP-Parameter-Request-List = DHCP-Subnet-Mask DHCP-Parameter-Request-List = DHCP-Broadcast-Address DHCP-Parameter-Request-List = DHCP-Time-Offset DHCP-Parameter-Request-List = DHCP-Router-Address DHCP-Parameter-Request-List = DHCP-Domain-Name DHCP-Parameter-Request-List = DHCP-Domain-Name-Server DHCP-Parameter-Request-List = DHCP-Hostname DHCP-Parameter-Request-List = DHCP-NTP-Servers server dhcp { Trying sub-section dhcp DHCP-Discover {...} +- entering group DHCP-Discover {...} ++[reply] returns noop ++[reply] returns noop [mac2ip] Added DHCP-Your-IP-Address: '172.16.101.101' to reply_items ++[mac2ip] returns ok ++[ok] returns ok } # server dhcp DHCP-Subnet-Mask = 255.255.255.0 DHCP-Router-Address = 172.16.101.1 DHCP-Domain-Name-Server = 8.8.8.8 DHCP-IP-Address-Lease-Time = 60 DHCP-DHCP-Server-Identifier = 172.16.101.1 Sending DHCP-Offer of id 90df5d69 from 172.16.101.1:67 to 172.16.101.101:68 Finished request 0. Cleaning up request 0 ID -1864409751 with timestamp +18 Going to the next request Ready to process requests. Received DHCP-Discover of id 90df5d69 from 0.0.0.0:68 to 255.255.255.255:67 DHCP-Opcode = Client-Message DHCP-Hardware-Type = Ethernet DHCP-Hardware-Address-Length = 6 DHCP-Hop-Count = 0 DHCP-Transaction-Id = 2430557545 DHCP-Number-of-Seconds = 5 DHCP-Flags = 0 DHCP-Client-IP-Address = 0.0.0.0 DHCP-Your-IP-Address = 0.0.0.0 DHCP-Server-IP-Address = 0.0.0.0 DHCP-Gateway-IP-Address = 0.0.0.0 DHCP-Client-Hardware-Address = 08:00:27:a2:13:b9 DHCP-Message-Type = DHCP-Discover DHCP-Parameter-Request-List = DHCP-Subnet-Mask DHCP-Parameter-Request-List = DHCP-Broadcast-Address DHCP-Parameter-Request-List = DHCP-Time-Offset DHCP-Parameter-Request-List = DHCP-Router-Address DHCP-Parameter-Request-List = DHCP-Domain-Name DHCP-Parameter-Request-List = DHCP-Domain-Name-Server DHCP-Parameter-Request-List = DHCP-Hostname DHCP-Parameter-Request-List = DHCP-NTP-Servers server dhcp { Trying sub-section dhcp DHCP-Discover {...} +- entering group DHCP-Discover {...} ++[reply] returns noop ++[reply] returns noop [mac2ip] Added DHCP-Your-IP-Address: '172.16.101.101' to reply_items ++[mac2ip] returns ok ++[ok] returns ok } # server dhcp DHCP-Subnet-Mask = 255.255.255.0 DHCP-Router-Address = 172.16.101.1 DHCP-Domain-Name-Server = 8.8.8.8 DHCP-IP-Address-Lease-Time = 60 DHCP-DHCP-Server-Identifier = 172.16.101.1 Sending DHCP-Offer of id 90df5d69 from 172.16.101.1:67 to 172.16.101.101:68 Finished request 1. Cleaning up request 1 ID -1864409751 with timestamp +23 Going to the next request Ready to process requests. #================================================================ tcpdump: #================================================================ 21:54:27.316739 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x90df5d69, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 21:54:27.316755 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x90df5d69, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 21:54:27.319714 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 21:54:28.319761 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 21:54:29.319717 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 21:54:32.319326 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x90df5d69, secs 5, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 21:54:32.319354 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 08:00:27:a2:13:b9, length 300, xid 0x90df5d69, secs 5, Flags [none] Client-Ethernet-Address 08:00:27:a2:13:b9 Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Discover Parameter-Request Option 55, length 8: Subnet-Mask, BR, Time-Zone, Default-Gateway Domain-Name, Domain-Name-Server, Hostname, NTP 21:54:32.323727 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 21:54:33.323764 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 21:54:34.323763 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 172.16.101.101 tell 172.16.101.1, length 28 #================================================================ If I manually force add arp entry using "arp -i dummy1 -s 172.16.101.101 08:00:27:a2:13:b9", then it works. Looks like there's still problem in arp cache update code. -- Fajar
Fajar A. Nugraha wrote:
First, while migrating my old test config, I forgot to uncomment mac2ip, which means there are no DHCP-Your-IP-Address attribute. When it receive dhcp discover packet, the server died with .. I don't think it should do that.
Nope. I've pushed a fix.
Second, there's still no packet sent to the client. And there's nothing in the debug log about updating ARP cache. FR debug log (starting from dhcp section):
It doesn't print a debug message, but you can add one. See src/main/dhcpd.c, look for "arp".
If I manually force add arp entry using "arp -i dummy1 -s 172.16.101.101 08:00:27:a2:13:b9", then it works. Looks like there's still problem in arp cache update code.
I don't have time to test this myself. Alan DeKok.
On Fri, Jan 13, 2012 at 10:17 PM, Alan DeKok <aland@deployingradius.com> wrote:
Fajar A. Nugraha wrote:
Second, there's still no packet sent to the client. And there's nothing in the debug log about updating ARP cache. FR debug log (starting from dhcp section):
It doesn't print a debug message, but you can add one. See src/main/dhcpd.c, look for "arp".
If I manually force add arp entry using "arp -i dummy1 -s 172.16.101.101 08:00:27:a2:13:b9", then it works. Looks like there's still problem in arp cache update code.
I don't have time to test this myself.
Setting "user=root" in radiusd.conf fixed the problem. Weird, since FR3 works just fine running as freerad, and it didn't even have cap_net_admin set. That's good enough for now though. Thanks. Will try some other tests. -- Fajar
Fajar A. Nugraha wrote:
Setting "user=root" in radiusd.conf fixed the problem.
Ah, yes.
Weird, since FR3 works just fine running as freerad, and it didn't even have cap_net_admin set.
FR3 doesn't update the ARP tables. That code needs to be ported from the v2.1.x branch. Updating the ARP tables is a whole lot simpler than opening a raw socket so that it can create unicast UDP packets. I'll see if I can update the sites-available/dhcp server to note that. Alan DeKok.
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Fajar A. Nugraha