diff options
Diffstat (limited to 'src/libcharon/plugins/dhcp')
| -rw-r--r-- | src/libcharon/plugins/dhcp/Makefile.am | 18 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/Makefile.in | 590 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_plugin.c | 81 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_plugin.h | 42 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_provider.c | 194 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_provider.h | 54 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_socket.c | 758 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_socket.h | 60 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_transaction.c | 184 | ||||
| -rw-r--r-- | src/libcharon/plugins/dhcp/dhcp_transaction.h | 109 |
10 files changed, 2090 insertions, 0 deletions
diff --git a/src/libcharon/plugins/dhcp/Makefile.am b/src/libcharon/plugins/dhcp/Makefile.am new file mode 100644 index 000000000..45d7536be --- /dev/null +++ b/src/libcharon/plugins/dhcp/Makefile.am @@ -0,0 +1,18 @@ + +INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libhydra \ + -I$(top_srcdir)/src/libcharon + +AM_CFLAGS = -rdynamic + +if MONOLITHIC +noinst_LTLIBRARIES = libstrongswan-dhcp.la +else +plugin_LTLIBRARIES = libstrongswan-dhcp.la +endif + +libstrongswan_dhcp_la_SOURCES = dhcp_plugin.h dhcp_plugin.c \ + dhcp_provider.h dhcp_provider.c \ + dhcp_socket.h dhcp_socket.c \ + dhcp_transaction.h dhcp_transaction.c + +libstrongswan_dhcp_la_LDFLAGS = -module -avoid-version diff --git a/src/libcharon/plugins/dhcp/Makefile.in b/src/libcharon/plugins/dhcp/Makefile.in new file mode 100644 index 000000000..7606b963c --- /dev/null +++ b/src/libcharon/plugins/dhcp/Makefile.in @@ -0,0 +1,590 @@ +# Makefile.in generated by automake 1.11 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, +# Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkglibexecdir = $(libexecdir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = 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+maintainer-clean: maintainer-clean-am + -rm -rf ./$(DEPDIR) + -rm -f Makefile +maintainer-clean-am: distclean-am maintainer-clean-generic + +mostlyclean: mostlyclean-am + +mostlyclean-am: mostlyclean-compile mostlyclean-generic \ + mostlyclean-libtool + +pdf: pdf-am + +pdf-am: + +ps: ps-am + +ps-am: + +uninstall-am: uninstall-pluginLTLIBRARIES + +.MAKE: install-am install-strip + +.PHONY: CTAGS GTAGS all all-am check check-am clean clean-generic \ + clean-libtool clean-noinstLTLIBRARIES clean-pluginLTLIBRARIES \ + ctags distclean distclean-compile distclean-generic \ + distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-pdf install-pdf-am \ + install-pluginLTLIBRARIES install-ps install-ps-am \ + install-strip installcheck installcheck-am installdirs \ + maintainer-clean maintainer-clean-generic mostlyclean \ + mostlyclean-compile mostlyclean-generic mostlyclean-libtool \ + pdf pdf-am ps ps-am tags uninstall uninstall-am \ + uninstall-pluginLTLIBRARIES + + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/src/libcharon/plugins/dhcp/dhcp_plugin.c b/src/libcharon/plugins/dhcp/dhcp_plugin.c new file mode 100644 index 000000000..829fd6356 --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_plugin.c @@ -0,0 +1,81 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include "dhcp_plugin.h" + +#include <hydra.h> +#include <daemon.h> + +#include "dhcp_socket.h" +#include "dhcp_provider.h" + +typedef struct private_dhcp_plugin_t private_dhcp_plugin_t; + +/** + * private data of dhcp plugin + */ +struct private_dhcp_plugin_t { + + /** + * implements plugin interface + */ + dhcp_plugin_t public; + + /** + * DHCP communication socket + */ + dhcp_socket_t *socket; + + /** + * Attribute provider + */ + dhcp_provider_t *provider; +}; + +METHOD(plugin_t, destroy, void, + private_dhcp_plugin_t *this) +{ + hydra->attributes->remove_provider(hydra->attributes, + &this->provider->provider); + this->provider->destroy(this->provider); + this->socket->destroy(this->socket); + free(this); +} + +/** + * Plugin constructor. + */ +plugin_t *dhcp_plugin_create() +{ + private_dhcp_plugin_t *this; + + INIT(this, + .public.plugin.destroy = _destroy, + .socket = dhcp_socket_create(), + ); + + if (!this->socket) + { + free(this); + return NULL; + } + + this->provider = dhcp_provider_create(this->socket); + hydra->attributes->add_provider(hydra->attributes, + &this->provider->provider); + + return &this->public.plugin; +} + diff --git a/src/libcharon/plugins/dhcp/dhcp_plugin.h b/src/libcharon/plugins/dhcp/dhcp_plugin.h new file mode 100644 index 000000000..b21b44d28 --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_plugin.h @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +/** + * @defgroup dhcp dhcp + * @ingroup cplugins + * + * @defgroup dhcp_plugin dhcp_plugin + * @{ @ingroup dhcp + */ + +#ifndef DHCP_PLUGIN_H_ +#define DHCP_PLUGIN_H_ + +#include <plugins/plugin.h> + +typedef struct dhcp_plugin_t dhcp_plugin_t; + +/** + * DHCP based attribute provider plugin. + */ +struct dhcp_plugin_t { + + /** + * implements plugin interface + */ + plugin_t plugin; +}; + +#endif /** DHCP_PLUGIN_H_ @}*/ diff --git a/src/libcharon/plugins/dhcp/dhcp_provider.c b/src/libcharon/plugins/dhcp/dhcp_provider.c new file mode 100644 index 000000000..dbcceb6ce --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_provider.c @@ -0,0 +1,194 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include "dhcp_provider.h" + +#include <utils/hashtable.h> +#include <threading/mutex.h> + +typedef struct private_dhcp_provider_t private_dhcp_provider_t; + +/** + * Private data of an dhcp_provider_t object. + */ +struct private_dhcp_provider_t { + + /** + * Public dhcp_provider_t interface. + */ + dhcp_provider_t public; + + /** + * Completed DHCP transactions + */ + hashtable_t *transactions; + + /** + * Lock for transactions + */ + mutex_t *mutex; + + /** + * DHCP communication socket + */ + dhcp_socket_t *socket; +}; + +/** + * Hashtable hash function + */ +static u_int hash(void *key) +{ + return (uintptr_t)key; +} + +/** + * Hashtable equals function + */ +static bool equals(void *a, void *b) +{ + return a == b; +} + +/** + * Hash ID and host to a key + */ +static uintptr_t hash_id_host(identification_t *id, host_t *host) +{ + return chunk_hash_inc(id->get_encoding(id), + chunk_hash(host->get_address(host))); +} + +/** + * Hash a DHCP transaction to a key, using address and id + */ +static uintptr_t hash_transaction(dhcp_transaction_t *transaction) +{ + return hash_id_host(transaction->get_identity(transaction), + transaction->get_address(transaction)); +} + +METHOD(attribute_provider_t, acquire_address, host_t*, + private_dhcp_provider_t *this, char *pool, + identification_t *id, host_t *requested) +{ + if (streq(pool, "dhcp")) + { + dhcp_transaction_t *transaction, *old; + host_t *vip; + + transaction = this->socket->enroll(this->socket, id); + if (!transaction) + { + return NULL; + } + vip = transaction->get_address(transaction); + vip = vip->clone(vip); + this->mutex->lock(this->mutex); + old = this->transactions->put(this->transactions, + (void*)hash_transaction(transaction), transaction); + this->mutex->unlock(this->mutex); + DESTROY_IF(old); + return vip; + } + return NULL; +} + +METHOD(attribute_provider_t, release_address, bool, + private_dhcp_provider_t *this, char *pool, + host_t *address, identification_t *id) +{ + if (streq(pool, "dhcp")) + { + dhcp_transaction_t *transaction; + + this->mutex->lock(this->mutex); + transaction = this->transactions->remove(this->transactions, + (void*)hash_id_host(id, address)); + this->mutex->unlock(this->mutex); + if (transaction) + { + this->socket->release(this->socket, transaction); + transaction->destroy(transaction); + return TRUE; + } + } + return FALSE; +} + +METHOD(attribute_provider_t, create_attribute_enumerator, enumerator_t*, + private_dhcp_provider_t *this, identification_t *id, host_t *vip) +{ + dhcp_transaction_t *transaction; + + if (!vip) + { + return NULL; + } + this->mutex->lock(this->mutex); + transaction = this->transactions->get(this->transactions, + (void*)hash_id_host(id, vip)); + if (!transaction) + { + this->mutex->unlock(this->mutex); + return NULL; + } + return enumerator_create_cleaner( + transaction->create_attribute_enumerator(transaction), + (void*)this->mutex->unlock, this->mutex); +} + +METHOD(dhcp_provider_t, destroy, void, + private_dhcp_provider_t *this) +{ + enumerator_t *enumerator; + dhcp_transaction_t *value; + void *key; + + enumerator = this->transactions->create_enumerator(this->transactions); + while (enumerator->enumerate(enumerator, &key, &value)) + { + value->destroy(value); + } + enumerator->destroy(enumerator); + this->transactions->destroy(this->transactions); + this->mutex->destroy(this->mutex); + free(this); +} + +/** + * See header + */ +dhcp_provider_t *dhcp_provider_create(dhcp_socket_t *socket) +{ + private_dhcp_provider_t *this; + + INIT(this, + .public = { + .provider = { + .acquire_address = _acquire_address, + .release_address = _release_address, + .create_attribute_enumerator = _create_attribute_enumerator, + }, + .destroy = _destroy, + }, + .socket = socket, + .mutex = mutex_create(MUTEX_TYPE_DEFAULT), + .transactions = hashtable_create(hash, equals, 8), + ); + + return &this->public; +} + diff --git a/src/libcharon/plugins/dhcp/dhcp_provider.h b/src/libcharon/plugins/dhcp/dhcp_provider.h new file mode 100644 index 000000000..e720e876c --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_provider.h @@ -0,0 +1,54 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +/** + * @defgroup dhcp_provider dhcp_provider + * @{ @ingroup dhcp + */ + +#ifndef DHCP_PROVIDER_H_ +#define DHCP_PROVIDER_H_ + +typedef struct dhcp_provider_t dhcp_provider_t; + +#include "dhcp_socket.h" + +#include <attributes/attribute_provider.h> + +/** + * DHCP based attribute provider. + */ +struct dhcp_provider_t { + + /** + * Implements attribute_provier_t interface. + */ + attribute_provider_t provider; + + /** + * Destroy a dhcp_provider_t. + */ + void (*destroy)(dhcp_provider_t *this); +}; + +/** + * Create a dhcp_provider instance. + * + * @param socket socket to use for DHCP communication + * @return provider instance + */ +dhcp_provider_t *dhcp_provider_create(dhcp_socket_t *socket); + +#endif /** DHCP_PROVIDER_H_ @}*/ diff --git a/src/libcharon/plugins/dhcp/dhcp_socket.c b/src/libcharon/plugins/dhcp/dhcp_socket.c new file mode 100644 index 000000000..f61b3a60e --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_socket.c @@ -0,0 +1,758 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include "dhcp_socket.h" + +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <netinet/udp.h> +#include <linux/if_arp.h> +#include <linux/if_ether.h> +#include <linux/filter.h> + +#include <utils/linked_list.h> +#include <utils/identification.h> +#include <threading/mutex.h> +#include <threading/condvar.h> +#include <threading/thread.h> + +#include <daemon.h> +#include <processing/jobs/callback_job.h> + +#define DHCP_SERVER_PORT 67 +#define DHCP_CLIENT_PORT 68 +#define DHCP_TRIES 5 + +typedef struct private_dhcp_socket_t private_dhcp_socket_t; + +/** + * Private data of an dhcp_socket_t object. + */ +struct private_dhcp_socket_t { + + /** + * Public dhcp_socket_t interface. + */ + dhcp_socket_t public; + + /** + * Random number generator + */ + rng_t *rng; + + /** + * List of transactions in DISCOVER + */ + linked_list_t *discover; + + /** + * List of transactions in REQUEST + */ + linked_list_t *request; + + /** + * List of successfully completed transactions + */ + linked_list_t *completed; + + /** + * Lock for transactions + */ + mutex_t *mutex; + + /** + * Condvar to wait for transaction completion + */ + condvar_t *condvar; + + /** + * Threads waiting in condvar + */ + int waiting; + + /** + * DHCP send socket + */ + int send; + + /** + * DHCP receive socket + */ + int receive; + + /** + * Do we use per-identity or random leases (and MAC addresses) + */ + bool identity_lease; + + /** + * DHCP server address, or broadcast + */ + host_t *dst; + + /** + * Callback job receiving DHCP responses + */ + callback_job_t *job; +}; + +/** + * DHCP opcode (or BOOTP actually) + */ +typedef enum { + BOOTREQUEST = 1, + BOOTREPLY = 2, +} dhcp_opcode_t; + +/** + * Some DHCP options used + */ +typedef enum { + DHCP_DNS_SERVER = 6, + DHCP_HOST_NAME = 12, + DHCP_NBNS_SERVER = 44, + DHCP_REQUESTED_IP = 50, + DHCP_MESSAGE_TYPE = 53, + DHCP_SERVER_ID = 54, + DHCP_PARAM_REQ_LIST = 55, + DHCP_CLIENT_ID = 61, + DHCP_OPTEND = 255, +} dhcp_option_type_t; + +/** + * DHCP messages types in the DHCP_MESSAGE_TYPE option + */ +typedef enum { + DHCP_DISCOVER = 1, + DHCP_OFFER = 2, + DHCP_REQUEST = 3, + DHCP_DECLINE = 4, + DHCP_ACK = 5, + DHCP_NAK = 6, + DHCP_RELEASE = 7, + DHCP_INFORM = 8, +} dhcp_message_type_t; +/** + * DHCP option encoding, a TLV + */ +typedef struct __attribute__((packed)) { + u_int8_t type; + u_int8_t len; + char data[]; +} dhcp_option_t; + +/** + * DHCP message format, with a maximum size options buffer + */ +typedef struct __attribute__((packed)) { + u_int8_t opcode; + u_int8_t hw_type; + u_int8_t hw_addr_len; + u_int8_t hop_count; + u_int32_t transaction_id; + u_int16_t number_of_seconds; + u_int16_t flags; + u_int32_t client_address; + u_int32_t your_address; + u_int32_t server_address; + u_int32_t gateway_address; + char client_hw_addr[6]; + char client_hw_padding[10]; + char server_hostname[64]; + char boot_filename[128]; + u_int32_t magic_cookie; + char options[252]; +} dhcp_t; + +/** + * Prepare a DHCP message for a given transaction + */ +static int prepare_dhcp(private_dhcp_socket_t *this, + dhcp_transaction_t *transaction, + dhcp_message_type_t type, dhcp_t *dhcp) +{ + chunk_t chunk, broadcast = chunk_from_chars(0xFF,0xFF,0xFF,0xFF); + identification_t *identity; + dhcp_option_t *option; + int optlen = 0; + host_t *src; + u_int32_t id; + + memset(dhcp, 0, sizeof(*dhcp)); + dhcp->opcode = BOOTREQUEST; + dhcp->hw_type = ARPHRD_ETHER; + dhcp->hw_addr_len = 6; + dhcp->transaction_id = transaction->get_id(transaction); + if (chunk_equals(broadcast, this->dst->get_address(this->dst))) + { + /* TODO: send with 0.0.0.0 source address */ + } + else + { + /* act as relay agent */ + src = charon->kernel_interface->get_source_addr( + charon->kernel_interface, this->dst, NULL); + if (src) + { + memcpy(&dhcp->gateway_address, src->get_address(src).ptr, + sizeof(dhcp->gateway_address)); + src->destroy(src); + } + } + + identity = transaction->get_identity(transaction); + chunk = identity->get_encoding(identity); + /* magic bytes, a locally administered unicast MAC */ + dhcp->client_hw_addr[0] = 0x7A; + dhcp->client_hw_addr[1] = 0xA7; + /* with ID specific postfix */ + if (this->identity_lease) + { + id = htonl(chunk_hash(chunk)); + } + else + { + id = transaction->get_id(transaction); + } + memcpy(&dhcp->client_hw_addr[2], &id, sizeof(id)); + + dhcp->magic_cookie = htonl(0x63825363); + + option = (dhcp_option_t*)&dhcp->options[optlen]; + option->type = DHCP_MESSAGE_TYPE; + option->len = 1; + option->data[0] = type; + optlen += sizeof(dhcp_option_t) + option->len; + + if (identity->get_type(identity) == ID_FQDN) + { + option = (dhcp_option_t*)&dhcp->options[optlen]; + option->type = DHCP_HOST_NAME; + option->len = min(chunk.len, 64); + memcpy(option->data, chunk.ptr, option->len); + optlen += sizeof(dhcp_option_t) + option->len; + } + + option = (dhcp_option_t*)&dhcp->options[optlen]; + option->type = DHCP_CLIENT_ID; + option->len = min(chunk.len, 64); + memcpy(option->data, chunk.ptr, option->len); + optlen += sizeof(dhcp_option_t) + option->len; + + return optlen; +} + +/** + * Send a DHCP message with given options length + */ +static bool send_dhcp(private_dhcp_socket_t *this, + dhcp_transaction_t *transaction, dhcp_t *dhcp, int optlen) +{ + host_t *dst; + ssize_t len; + + dst = transaction->get_server(transaction); + if (!dst) + { + dst = this->dst; + } + len = offsetof(dhcp_t, magic_cookie) + ((optlen + 4) / 64 * 64 + 64); + return sendto(this->send, dhcp, len, 0, dst->get_sockaddr(dst), + *dst->get_sockaddr_len(dst)) == len; +} + +/** + * Send DHCP discover using a given transaction + */ +static bool discover(private_dhcp_socket_t *this, + dhcp_transaction_t *transaction) +{ + dhcp_option_t *option; + dhcp_t dhcp; + int optlen; + + optlen = prepare_dhcp(this, transaction, DHCP_DISCOVER, &dhcp); + + DBG1(DBG_CFG, "sending DHCP DISCOVER to %H", this->dst); + + option = (dhcp_option_t*)&dhcp.options[optlen]; + option->type = DHCP_PARAM_REQ_LIST; + option->len = 2; + option->data[0] = DHCP_DNS_SERVER; + option->data[1] = DHCP_NBNS_SERVER; + optlen += sizeof(dhcp_option_t) + option->len; + + dhcp.options[optlen++] = DHCP_OPTEND; + + if (!send_dhcp(this, transaction, &dhcp, optlen)) + { + DBG1(DBG_CFG, "sending DHCP DISCOVER failed: %s", strerror(errno)); + return FALSE; + } + return TRUE; +} + +/** + * Send DHCP request using a given transaction + */ +static bool request(private_dhcp_socket_t *this, + dhcp_transaction_t *transaction) +{ + dhcp_option_t *option; + dhcp_t dhcp; + host_t *offer, *server; + chunk_t chunk; + int optlen; + + optlen = prepare_dhcp(this, transaction, DHCP_REQUEST, &dhcp); + + offer = transaction->get_address(transaction); + server = transaction->get_server(transaction); + if (!offer || !server) + { + return FALSE; + } + DBG1(DBG_CFG, "sending DHCP REQUEST for %H to %H", offer, server); + + option = (dhcp_option_t*)&dhcp.options[optlen]; + option->type = DHCP_REQUESTED_IP; + option->len = 4; + chunk = offer->get_address(offer); + memcpy(option->data, chunk.ptr, min(chunk.len, option->len)); + optlen += sizeof(dhcp_option_t) + option->len; + + option = (dhcp_option_t*)&dhcp.options[optlen]; + option->type = DHCP_SERVER_ID; + option->len = 4; + chunk = server->get_address(server); + memcpy(option->data, chunk.ptr, min(chunk.len, option->len)); + optlen += sizeof(dhcp_option_t) + option->len; + + option = (dhcp_option_t*)&dhcp.options[optlen]; + option->type = DHCP_PARAM_REQ_LIST; + option->len = 2; + option->data[0] = DHCP_DNS_SERVER; + option->data[1] = DHCP_NBNS_SERVER; + optlen += sizeof(dhcp_option_t) + option->len; + + dhcp.options[optlen++] = DHCP_OPTEND; + + if (!send_dhcp(this, transaction, &dhcp, optlen)) + { + DBG1(DBG_CFG, "sending DHCP REQUEST failed: %s", strerror(errno)); + return FALSE; + } + return TRUE; +} + +METHOD(dhcp_socket_t, enroll, dhcp_transaction_t*, + private_dhcp_socket_t *this, identification_t *identity) +{ + dhcp_transaction_t *transaction; + u_int32_t id; + int try; + + this->rng->get_bytes(this->rng, sizeof(id), (u_int8_t*)&id); + transaction = dhcp_transaction_create(id, identity); + + this->mutex->lock(this->mutex); + this->discover->insert_last(this->discover, transaction); + try = 1; + while (try <= DHCP_TRIES && discover(this, transaction)) + { + if (!this->condvar->timed_wait(this->condvar, this->mutex, 1000 * try) && + this->request->find_first(this->request, NULL, + (void**)&transaction) == SUCCESS) + { + break; + } + try++; + } + if (this->discover->remove(this->discover, transaction, NULL)) + { /* no OFFER received */ + this->mutex->unlock(this->mutex); + transaction->destroy(transaction); + DBG1(DBG_CFG, "DHCP DISCOVER timed out"); + return NULL; + } + + try = 1; + while (try <= DHCP_TRIES && request(this, transaction)) + { + if (!this->condvar->timed_wait(this->condvar, this->mutex, 1000 * try) && + this->completed->remove(this->completed, transaction, NULL)) + { + break; + } + try++; + } + if (this->request->remove(this->request, transaction, NULL)) + { /* no ACK received */ + this->mutex->unlock(this->mutex); + transaction->destroy(transaction); + DBG1(DBG_CFG, "DHCP REQUEST timed out"); + return NULL; + } + this->mutex->unlock(this->mutex); + + return transaction; +} + +METHOD(dhcp_socket_t, release, void, + private_dhcp_socket_t *this, dhcp_transaction_t *transaction) +{ + dhcp_option_t *option; + dhcp_t dhcp; + host_t *release, *server; + chunk_t chunk; + int optlen; + + optlen = prepare_dhcp(this, transaction, DHCP_RELEASE, &dhcp); + + release = transaction->get_address(transaction); + server = transaction->get_server(transaction); + if (!release || !server) + { + return; + } + DBG1(DBG_CFG, "sending DHCP RELEASE for %H to %H", release, server); + + chunk = release->get_address(release); + memcpy(&dhcp.client_address, chunk.ptr, + min(chunk.len, sizeof(dhcp.client_address))); + + option = (dhcp_option_t*)&dhcp.options[optlen]; + option->type = DHCP_SERVER_ID; + option->len = 4; + chunk = server->get_address(server); + memcpy(option->data, chunk.ptr, min(chunk.len, option->len)); + optlen += sizeof(dhcp_option_t) + option->len; + + dhcp.options[optlen++] = DHCP_OPTEND; + + if (!send_dhcp(this, transaction, &dhcp, optlen)) + { + DBG1(DBG_CFG, "sending DHCP RELEASE failed: %s", strerror(errno)); + } +} + +/** + * Handle a DHCP OFFER + */ +static void handle_offer(private_dhcp_socket_t *this, dhcp_t *dhcp, int optlen) +{ + dhcp_transaction_t *transaction = NULL; + enumerator_t *enumerator; + host_t *offer, *server; + + offer = host_create_from_chunk(AF_INET, + chunk_from_thing(dhcp->your_address), 0); + server = host_create_from_chunk(AF_INET, + chunk_from_thing(dhcp->server_address), DHCP_SERVER_PORT); + + this->mutex->lock(this->mutex); + enumerator = this->discover->create_enumerator(this->discover); + while (enumerator->enumerate(enumerator, &transaction)) + { + if (transaction->get_id(transaction) == dhcp->transaction_id) + { + DBG1(DBG_CFG, "received DHCP OFFER %H from %H", offer, server); + this->discover->remove_at(this->discover, enumerator); + this->request->insert_last(this->request, transaction); + transaction->set_address(transaction, offer->clone(offer)); + transaction->set_server(transaction, server->clone(server)); + break; + } + } + enumerator->destroy(enumerator); + + if (transaction) + { + int optsize, optpos = 0, pos; + dhcp_option_t *option; + + while (optlen > sizeof(dhcp_option_t)) + { + option = (dhcp_option_t*)&dhcp->options[optpos]; + optsize = sizeof(dhcp_option_t) + option->len; + if (option->type == DHCP_OPTEND || optlen < optsize) + { + break; + } + if (option->type == DHCP_DNS_SERVER || + option->type == DHCP_NBNS_SERVER) + { + for (pos = 0; pos + 4 <= option->len; pos += 4) + { + transaction->add_attribute(transaction, option->type == + DHCP_DNS_SERVER ? INTERNAL_IP4_DNS : INTERNAL_IP4_NBNS, + chunk_create((char*)&option->data[pos], 4)); + } + } + optlen -= optsize; + optpos += optsize; + } + } + this->mutex->unlock(this->mutex); + this->condvar->broadcast(this->condvar); + offer->destroy(offer); + server->destroy(server); +} + +/** + * Handle a DHCP ACK + */ +static void handle_ack(private_dhcp_socket_t *this, dhcp_t *dhcp, int optlen) +{ + dhcp_transaction_t *transaction; + enumerator_t *enumerator; + host_t *offer; + + offer = host_create_from_chunk(AF_INET, + chunk_from_thing(dhcp->your_address), 0); + + this->mutex->lock(this->mutex); + enumerator = this->request->create_enumerator(this->request); + while (enumerator->enumerate(enumerator, &transaction)) + { + if (transaction->get_id(transaction) == dhcp->transaction_id) + { + DBG1(DBG_CFG, "received DHCP ACK for %H", offer); + this->request->remove_at(this->request, enumerator); + this->completed->insert_last(this->completed, transaction); + break; + } + } + enumerator->destroy(enumerator); + this->mutex->unlock(this->mutex); + this->condvar->broadcast(this->condvar); + offer->destroy(offer); +} + +/** + * Receive DHCP responses + */ +static job_requeue_t receive_dhcp(private_dhcp_socket_t *this) +{ + struct sockaddr_ll addr; + socklen_t addr_len = sizeof(addr); + struct __attribute__((packed)) { + struct iphdr ip; + struct udphdr udp; + dhcp_t dhcp; + } packet; + int oldstate, optlen, origoptlen, optsize, optpos = 0; + ssize_t len; + dhcp_option_t *option; + + oldstate = thread_cancelability(TRUE); + len = recvfrom(this->receive, &packet, sizeof(packet), 0, + (struct sockaddr*)&addr, &addr_len); + thread_cancelability(oldstate); + + if (len >= sizeof(struct iphdr) + sizeof(struct udphdr) + + offsetof(dhcp_t, options)) + { + origoptlen = optlen = len - sizeof(struct iphdr) + + sizeof(struct udphdr) + offsetof(dhcp_t, options); + while (optlen > sizeof(dhcp_option_t)) + { + option = (dhcp_option_t*)&packet.dhcp.options[optpos]; + optsize = sizeof(dhcp_option_t) + option->len; + if (option->type == DHCP_OPTEND || optlen < optsize) + { + break; + } + if (option->type == DHCP_MESSAGE_TYPE && option->len == 1) + { + switch (option->data[0]) + { + case DHCP_OFFER: + handle_offer(this, &packet.dhcp, origoptlen); + break; + case DHCP_ACK: + handle_ack(this, &packet.dhcp, origoptlen); + default: + break; + } + break; + } + optlen -= optsize; + optpos += optsize; + } + } + return JOB_REQUEUE_DIRECT; +} + +METHOD(dhcp_socket_t, destroy, void, + private_dhcp_socket_t *this) +{ + if (this->job) + { + this->job->cancel(this->job); + } + while (this->waiting) + { + this->condvar->signal(this->condvar); + } + if (this->send > 0) + { + close(this->send); + } + if (this->receive > 0) + { + close(this->receive); + } + this->mutex->destroy(this->mutex); + this->condvar->destroy(this->condvar); + this->discover->destroy_offset(this->discover, + offsetof(dhcp_transaction_t, destroy)); + this->request->destroy_offset(this->request, + offsetof(dhcp_transaction_t, destroy)); + this->completed->destroy_offset(this->completed, + offsetof(dhcp_transaction_t, destroy)); + DESTROY_IF(this->rng); + DESTROY_IF(this->dst); + free(this); +} + +/** + * See header + */ +dhcp_socket_t *dhcp_socket_create() +{ + private_dhcp_socket_t *this; + struct sockaddr_in src; + int on = 1; + struct sock_filter dhcp_filter_code[] = { + BPF_STMT(BPF_LD+BPF_B+BPF_ABS, + offsetof(struct iphdr, protocol)), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, IPPROTO_UDP, 0, 16), + BPF_STMT(BPF_LD+BPF_H+BPF_ABS, sizeof(struct iphdr) + + offsetof(struct udphdr, source)), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, DHCP_SERVER_PORT, 0, 14), + BPF_STMT(BPF_LD+BPF_H+BPF_ABS, sizeof(struct iphdr) + + offsetof(struct udphdr, dest)), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, DHCP_CLIENT_PORT, 0, 2), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, DHCP_SERVER_PORT, 0, 1), + BPF_JUMP(BPF_JMP+BPF_JA, 0, 0, 10), + BPF_STMT(BPF_LD+BPF_B+BPF_ABS, sizeof(struct iphdr) + + sizeof(struct udphdr) + offsetof(dhcp_t, opcode)), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, BOOTREPLY, 0, 8), + BPF_STMT(BPF_LD+BPF_B+BPF_ABS, sizeof(struct iphdr) + + sizeof(struct udphdr) + offsetof(dhcp_t, hw_type)), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, ARPHRD_ETHER, 0, 6), + BPF_STMT(BPF_LD+BPF_B+BPF_ABS, sizeof(struct iphdr) + + sizeof(struct udphdr) + offsetof(dhcp_t, hw_addr_len)), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 6, 0, 4), + BPF_STMT(BPF_LD+BPF_W+BPF_ABS, sizeof(struct iphdr) + + sizeof(struct udphdr) + offsetof(dhcp_t, magic_cookie)), + BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 0x63825363, 0, 2), + BPF_STMT(BPF_LD+BPF_W+BPF_LEN, 0), + BPF_STMT(BPF_RET+BPF_A, 0), + BPF_STMT(BPF_RET+BPF_K, 0), + }; + struct sock_fprog dhcp_filter = { + sizeof(dhcp_filter_code) / sizeof(struct sock_filter), + dhcp_filter_code, + }; + + INIT(this, + .public = { + .enroll = _enroll, + .release = _release, + .destroy = _destroy, + }, + .rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK), + .mutex = mutex_create(MUTEX_TYPE_DEFAULT), + .condvar = condvar_create(CONDVAR_TYPE_DEFAULT), + .discover = linked_list_create(), + .request = linked_list_create(), + .completed = linked_list_create(), + ); + + if (!this->rng) + { + DBG1(DBG_CFG, "unable to create RNG"); + destroy(this); + return NULL; + } + this->identity_lease = lib->settings->get_bool(lib->settings, + "charon.plugins.dhcp.identity_lease", FALSE); + this->dst = host_create_from_string(lib->settings->get_str(lib->settings, + "charon.plugins.dhcp.server", "255.255.255.255"), + DHCP_SERVER_PORT); + if (!this->dst) + { + DBG1(DBG_CFG, "configured DHCP server address invalid"); + destroy(this); + return NULL; + } + + this->send = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (this->send == -1) + { + DBG1(DBG_CFG, "unable to create DHCP send socket: %s", strerror(errno)); + destroy(this); + return NULL; + } + if (setsockopt(this->send, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) + { + DBG1(DBG_CFG, "unable to reuse DHCP socket address: %s", strerror(errno)); + destroy(this); + return NULL; + } + if (setsockopt(this->send, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) == -1) + { + DBG1(DBG_CFG, "unable to broadcast on DHCP socket: %s", strerror(errno)); + destroy(this); + return NULL; + } + src.sin_family = AF_INET; + src.sin_port = htons(DHCP_CLIENT_PORT); + src.sin_addr.s_addr = INADDR_ANY; + if (bind(this->send, (struct sockaddr*)&src, sizeof(src)) == -1) + { + DBG1(DBG_CFG, "unable to bind DHCP send socket: %s", strerror(errno)); + destroy(this); + return NULL; + } + + this->receive = socket(AF_PACKET, SOCK_DGRAM, htons(ETH_P_IP)); + if (this->receive == -1) + { + DBG1(DBG_NET, "opening DHCP receive socket failed: %s", strerror(errno)); + destroy(this); + return NULL; + } + if (setsockopt(this->receive, SOL_SOCKET, SO_ATTACH_FILTER, + &dhcp_filter, sizeof(dhcp_filter)) < 0) + { + DBG1(DBG_CFG, "installing DHCP socket filter failed: %s", + strerror(errno)); + destroy(this); + return NULL; + } + + this->job = callback_job_create((callback_job_cb_t)receive_dhcp, + this, NULL, NULL); + charon->processor->queue_job(charon->processor, (job_t*)this->job); + + return &this->public; +} + diff --git a/src/libcharon/plugins/dhcp/dhcp_socket.h b/src/libcharon/plugins/dhcp/dhcp_socket.h new file mode 100644 index 000000000..0a8398aba --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_socket.h @@ -0,0 +1,60 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +/** + * @defgroup dhcp_socket dhcp_socket + * @{ @ingroup dhcp + */ + +#ifndef DHCP_SOCKET_H_ +#define DHCP_SOCKET_H_ + +typedef struct dhcp_socket_t dhcp_socket_t; + +#include "dhcp_transaction.h" + +/** + * DHCP socket implementation + */ +struct dhcp_socket_t { + + /** + * Enroll a client address using DHCP. + * + * @param identity peer identity to enroll an address for + * @return completed DHCP transaction, NULL on failure + */ + dhcp_transaction_t* (*enroll)(dhcp_socket_t *this, + identification_t *identity); + + /** + * Release an enrolled DHCP address. + * + * @param transaction transaction returned by enroll + */ + void (*release)(dhcp_socket_t *this, dhcp_transaction_t *transaction); + + /** + * Destroy a dhcp_socket_t. + */ + void (*destroy)(dhcp_socket_t *this); +}; + +/** + * Create a dhcp_socket instance. + */ +dhcp_socket_t *dhcp_socket_create(); + +#endif /** DHCP_SOCKET_H_ @}*/ diff --git a/src/libcharon/plugins/dhcp/dhcp_transaction.c b/src/libcharon/plugins/dhcp/dhcp_transaction.c new file mode 100644 index 000000000..83f822dd8 --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_transaction.c @@ -0,0 +1,184 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include "dhcp_transaction.h" + +#include <utils/linked_list.h> + +typedef struct private_dhcp_transaction_t private_dhcp_transaction_t; + +/** + * Private data of an dhcp_transaction_t object. + */ +struct private_dhcp_transaction_t { + + /** + * Public dhcp_transaction_t interface. + */ + dhcp_transaction_t public; + + /** + * DHCP transaction ID + */ + u_int32_t id; + + /** + * Peer identity + */ + identification_t *identity; + + /** + * received DHCP address + */ + host_t *address; + + /** + * discovered DHCP server address + */ + host_t *server; + + /** + * List of added attributes, as attribute_entry_t + */ + linked_list_t *attributes; +}; + +/** + * Entry for an added attribute + */ +typedef struct { + configuration_attribute_type_t type; + chunk_t data; +} attribute_entry_t; + +METHOD(dhcp_transaction_t, get_id, u_int32_t, + private_dhcp_transaction_t *this) +{ + return this->id; +} + +METHOD(dhcp_transaction_t, get_identity, identification_t*, + private_dhcp_transaction_t *this) +{ + return this->identity; +} + +METHOD(dhcp_transaction_t, set_address, void, + private_dhcp_transaction_t *this, host_t *address) +{ + DESTROY_IF(this->address); + this->address = address; +} + +METHOD(dhcp_transaction_t, get_address, host_t*, + private_dhcp_transaction_t *this) +{ + return this->address; +} + +METHOD(dhcp_transaction_t, set_server, void, + private_dhcp_transaction_t *this, host_t *server) +{ + DESTROY_IF(this->server); + this->server = server; +} + +METHOD(dhcp_transaction_t, get_server, host_t*, + private_dhcp_transaction_t *this) +{ + return this->server; +} + +METHOD(dhcp_transaction_t, add_attribute, void, + private_dhcp_transaction_t *this, configuration_attribute_type_t type, + chunk_t data) +{ + attribute_entry_t *entry; + + INIT(entry, + .type = type, + .data = chunk_clone(data), + ); + this->attributes->insert_last(this->attributes, entry); +} + +/** + * Filter function to map entries to type/data + */ +static bool attribute_filter(void *null, attribute_entry_t **entry, + configuration_attribute_type_t *type, + void **dummy, chunk_t *data) +{ + *type = (*entry)->type; + *data = (*entry)->data; + return TRUE; +} + +METHOD(dhcp_transaction_t, create_attribute_enumerator, enumerator_t*, + private_dhcp_transaction_t *this) +{ + return enumerator_create_filter( + this->attributes->create_enumerator(this->attributes), + (void*)attribute_filter, NULL, NULL); +} + +/** + * Clean up an attribute entry + */ +static void attribute_entry_destroy(attribute_entry_t *entry) +{ + free(entry->data.ptr); + free(entry); +} + +METHOD(dhcp_transaction_t, destroy, void, + private_dhcp_transaction_t *this) +{ + this->identity->destroy(this->identity); + DESTROY_IF(this->address); + DESTROY_IF(this->server); + this->attributes->destroy_function(this->attributes, + (void*)attribute_entry_destroy); + free(this); +} + +/** + * See header + */ +dhcp_transaction_t *dhcp_transaction_create(u_int32_t id, + identification_t *identity) +{ + private_dhcp_transaction_t *this; + + INIT(this, + .public = { + .get_id = _get_id, + .get_identity = _get_identity, + .set_address = _set_address, + .get_address = _get_address, + .set_server = _set_server, + .get_server = _get_server, + .add_attribute = _add_attribute, + .create_attribute_enumerator = _create_attribute_enumerator, + .destroy = _destroy, + }, + .id = id, + .identity = identity->clone(identity), + .attributes = linked_list_create(), + ); + + return &this->public; +} + diff --git a/src/libcharon/plugins/dhcp/dhcp_transaction.h b/src/libcharon/plugins/dhcp/dhcp_transaction.h new file mode 100644 index 000000000..19c163f88 --- /dev/null +++ b/src/libcharon/plugins/dhcp/dhcp_transaction.h @@ -0,0 +1,109 @@ +/* + * Copyright (C) 2010 Martin Willi + * Copyright (C) 2010 revosec AG + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +/** + * @defgroup dhcp_transaction dhcp_transaction + * @{ @ingroup dhcp + */ + +#ifndef DHCP_TRANSACTION_H_ +#define DHCP_TRANSACTION_H_ + +#include <utils/host.h> +#include <utils/identification.h> +#include <attributes/attributes.h> + +typedef struct dhcp_transaction_t dhcp_transaction_t; + +/** + * DHCP transaction class. + */ +struct dhcp_transaction_t { + + /** + * Get the DCHP transaction ID. + * + * @return DHCP transaction identifier + */ + u_int32_t (*get_id)(dhcp_transaction_t *this); + + /** + * Get the peer identity this transaction is used for. + * + * @return peer Identity + */ + identification_t* (*get_identity)(dhcp_transaction_t *this); + + /** + * Set the DHCP address received using this transaction. + * + * @param host received DHCP address + */ + void (*set_address)(dhcp_transaction_t *this, host_t *address); + + /** + * Get the DHCP address received using this transaction. + * + * @return received DHCP address + */ + host_t* (*get_address)(dhcp_transaction_t *this); + + /** + * Set the DCHP server address discovered. + * + * @param server DHCP server address + */ + void (*set_server)(dhcp_transaction_t *this, host_t *server); + + /** + * Get the DHCP server address. + * + * @return DHCP server address + */ + host_t* (*get_server)(dhcp_transaction_t *this); + + /** + * An an additional attribute to serve to peer. + * + * @param type type of attribute + * @param data attribute data + */ + void (*add_attribute)(dhcp_transaction_t *this, + configuration_attribute_type_t type, chunk_t data); + + /** + * Create an enumerator over added attributes. + * + * @return enumerator over (configuration_attribute_t, chunk_t) + */ + enumerator_t* (*create_attribute_enumerator)(dhcp_transaction_t *this); + + /** + * Destroy a dhcp_transaction_t. + */ + void (*destroy)(dhcp_transaction_t *this); +}; + +/** + * Create a dhcp_transaction instance. + * + * @param id DHCP transaction identifier + * @param identity peer identity this transaction is used for + * @return transaction instance + */ +dhcp_transaction_t *dhcp_transaction_create(u_int32_t id, + identification_t *identity); + +#endif /** DHCP_TRANSACTION_H_ @}*/ |