/* * Copyright (C) 2007 Tobias Brunner * Hochschule fuer Technik Rapperswil * * 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 . * * 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. * * $Id: endpoint_notify.c 3735 2008-04-02 18:21:03Z tobias $ */ #include "endpoint_notify.h" #include #include typedef struct private_endpoint_notify_t private_endpoint_notify_t; /** * Private data of an notify_payload_t object. * */ struct private_endpoint_notify_t { /** * Public endpoint_notify_t interface. */ endpoint_notify_t public; /** * Priority */ u_int32_t priority; /** * Family */ me_endpoint_family_t family; /** * Endpoint type */ me_endpoint_type_t type; /** * Endpoint */ host_t *endpoint; /** * Base (used for server reflexive endpoints) */ host_t *base; }; /* Notification data: 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Priority ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Family ! Type ! Port ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! IP Address (variable) +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ ENUM(me_endpoint_type_names, HOST, RELAYED, "HOST", "PEER_REFLEXIVE", "SERVER_REFLEXIVE", "RELAYED" ); /** * Helper functions to parse integer values */ static status_t parse_uint8(u_int8_t **cur, u_int8_t *top, u_int8_t *val) { if (*cur + sizeof(u_int8_t) > top) { return FAILED; } *val = *(u_int8_t*)*cur; *cur += sizeof(u_int8_t); return SUCCESS; } static status_t parse_uint16(u_int8_t **cur, u_int8_t *top, u_int16_t *val) { if (*cur + sizeof(u_int16_t) > top) { return FAILED; } *val = ntohs(*(u_int16_t*)*cur); *cur += sizeof(u_int16_t); return SUCCESS; } static status_t parse_uint32(u_int8_t **cur, u_int8_t *top, u_int32_t *val) { if (*cur + sizeof(u_int32_t) > top) { return FAILED; } *val = ntohl(*(u_int32_t*)*cur); *cur += sizeof(u_int32_t); return SUCCESS; } /** * Parses the notification data of a ME_ENDPOINT notify */ static status_t parse_notification_data(private_endpoint_notify_t *this, chunk_t data) { u_int8_t family, type, addr_family; u_int16_t port; chunk_t addr; u_int8_t *cur = data.ptr; u_int8_t *top = data.ptr + data.len; DBG3(DBG_IKE, "me_endpoint_data %B", &data); if (parse_uint32(&cur, top, &this->priority) != SUCCESS) { DBG1(DBG_IKE, "failed to parse ME_ENDPOINT: invalid priority"); return FAILED; } if (parse_uint8(&cur, top, &family) != SUCCESS || family >= MAX_FAMILY) { DBG1(DBG_IKE, "failed to parse ME_ENDPOINT: invalid family"); return FAILED; } this->family = (me_endpoint_family_t)family; if (parse_uint8(&cur, top, &type) != SUCCESS || type >= MAX_TYPE) { DBG1(DBG_IKE, "failed to parse ME_ENDPOINT: invalid type"); return FAILED; } this->type = (me_endpoint_type_t)type; addr_family = AF_INET; addr.len = 4; switch(this->family) { case IPv6: addr_family = AF_INET6; addr.len = 16; /* fall-through */ case IPv4: if (parse_uint16(&cur, top, &port) != SUCCESS) { DBG1(DBG_IKE, "failed to parse ME_ENDPOINT: invalid port"); return FAILED; } if (cur + addr.len > top) { DBG1(DBG_IKE, "failed to parse ME_ENDPOINT: invalid IP address"); return FAILED; } addr.ptr = cur; this->endpoint = host_create_from_chunk(addr_family, addr, port); break; case NO_FAMILY: default: this->endpoint = NULL; break; } return SUCCESS; } /** * Generates the notification data of a ME_ENDPOINT notify */ static chunk_t build_notification_data(private_endpoint_notify_t *this) { chunk_t prio_chunk, family_chunk, type_chunk, port_chunk, addr_chunk; chunk_t data; u_int32_t prio; u_int16_t port; u_int8_t family, type; prio = htonl(this->priority); prio_chunk = chunk_from_thing(prio); family = this->family; family_chunk = chunk_from_thing(family); type = this->type; type_chunk = chunk_from_thing(type); if (this->endpoint) { port = htons(this->endpoint->get_port(this->endpoint)); addr_chunk = this->endpoint->get_address(this->endpoint); } else { port = 0; addr_chunk = chunk_empty; } port_chunk = chunk_from_thing(port); /* data = prio | family | type | port | addr */ data = chunk_cat("ccccc", prio_chunk, family_chunk, type_chunk, port_chunk, addr_chunk); DBG3(DBG_IKE, "me_endpoint_data %B", &data); return data; } /** * Implementation of endpoint_notify_t.build_notify */ static notify_payload_t *build_notify(private_endpoint_notify_t *this) { chunk_t data; notify_payload_t *notify; notify = notify_payload_create(); notify->set_notify_type(notify, ME_ENDPOINT); data = build_notification_data(this); notify->set_notification_data(notify, data); chunk_free(&data); return notify; } /** * Implementation of endpoint_notify_t.get_priority. */ static u_int32_t get_priority(private_endpoint_notify_t *this) { return this->priority; } /** * Implementation of endpoint_notify_t.set_priority. */ static void set_priority(private_endpoint_notify_t *this, u_int32_t priority) { this->priority = priority; } /** * Implementation of endpoint_notify_t.get_type. */ static me_endpoint_type_t get_type(private_endpoint_notify_t *this) { return this->type; } /** * Implementation of endpoint_notify_t.get_family. */ static me_endpoint_family_t get_family(private_endpoint_notify_t *this) { return this->family; } /** * Implementation of endpoint_notify_t.get_host. */ static host_t *get_host(private_endpoint_notify_t *this) { return this->endpoint; } /** * Implementation of endpoint_notify_t.get_base. */ static host_t *get_base(private_endpoint_notify_t *this) { return (!this->base) ? this->endpoint : this->base; } /** * Implementation of endpoint_notify_t.clone. */ static endpoint_notify_t *_clone(private_endpoint_notify_t *this) { private_endpoint_notify_t *clone = (private_endpoint_notify_t*)endpoint_notify_create(); clone->priority = this->priority; clone->type = this->type; clone->family = this->family; if (this->endpoint) { clone->endpoint = this->endpoint->clone(this->endpoint); } if (this->base) { clone->base = this->base->clone(this->base); } return &clone->public; } /** * Implementation of endpoint_notify_t.destroy. */ static status_t destroy(private_endpoint_notify_t *this) { DESTROY_IF(this->endpoint); DESTROY_IF(this->base); free(this); return SUCCESS; } /* * Described in header */ endpoint_notify_t *endpoint_notify_create() { private_endpoint_notify_t *this = malloc_thing(private_endpoint_notify_t); /* public functions */ this->public.get_priority = (u_int32_t (*) (endpoint_notify_t *)) get_priority; this->public.set_priority = (void (*) (endpoint_notify_t *, u_int32_t)) set_priority; this->public.get_type = (me_endpoint_type_t (*) (endpoint_notify_t *)) get_type; this->public.get_family = (me_endpoint_family_t (*) (endpoint_notify_t *)) get_family; this->public.get_host = (host_t *(*) (endpoint_notify_t *)) get_host; this->public.get_base = (host_t *(*) (endpoint_notify_t *)) get_base; this->public.build_notify = (notify_payload_t *(*) (endpoint_notify_t *)) build_notify; this->public.clone = (endpoint_notify_t *(*) (endpoint_notify_t *)) _clone; this->public.destroy = (void (*) (endpoint_notify_t *)) destroy; /* set default values of the fields */ this->priority = 0; this->family = NO_FAMILY; this->type = NO_TYPE; this->endpoint = NULL; this->base = NULL; return &this->public; } /** * Described in header */ endpoint_notify_t *endpoint_notify_create_from_host(me_endpoint_type_t type, host_t *host, host_t *base) { private_endpoint_notify_t *this = (private_endpoint_notify_t*)endpoint_notify_create(); this->type = type; switch(type) { case HOST: this->priority = pow(2, 16) * ME_PRIO_HOST; break; case PEER_REFLEXIVE: this->priority = pow(2, 16) * ME_PRIO_PEER; break; case SERVER_REFLEXIVE: this->priority = pow(2, 16) * ME_PRIO_SERVER; break; case RELAYED: default: this->priority = pow(2, 16) * ME_PRIO_RELAY; break; } /* FIXME: if there is more than one ip address we should vary this priority */ this->priority += 65535; if (!host) { return &this->public; } switch(host->get_family(host)) { case AF_INET: this->family = IPv4; break; case AF_INET6: this->family = IPv6; break; default: /* unsupported family type, we do not set the host * (family is set to NO_FAMILY) */ return &this->public; } this->endpoint = host->clone(host); if (base) { this->base = base->clone(base); } return &this->public; } /** * Described in header */ endpoint_notify_t *endpoint_notify_create_from_payload(notify_payload_t *notify) { if (notify->get_notify_type(notify) != ME_ENDPOINT) { return NULL; } private_endpoint_notify_t *this = (private_endpoint_notify_t*)endpoint_notify_create(); chunk_t data = notify->get_notification_data(notify); if (parse_notification_data(this, data) != SUCCESS) { destroy(this); return NULL; } return &this->public; }