packet.c

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/*
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   This library 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
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/** fr_packet_t alloc/free functions
 *
 * @file src/lib/server/packet.c
 *
 * @copyright 2023 Network RADIUS SAS (legal@networkradius.com)
 */
RCSID("$Id: 2882adc211306f4b45c705eac0f54f2331a68eb7 $")
 
#include <freeradius-devel/server/packet.h>
#include <freeradius-devel/util/pair_legacy.h>
 
static fr_dict_t const *dict_freeradius;
 
extern fr_dict_autoload_t util_packet_dict[];
fr_dict_autoload_t util_packet_dict[] = {
        { .out = &dict_freeradius, .proto = "freeradius" },
        { NULL }
};
 
static fr_dict_attr_t const *attr_net;
static fr_dict_attr_t const *attr_net_src;
static fr_dict_attr_t const *attr_net_src_ip;
static fr_dict_attr_t const *attr_net_src_port;
static fr_dict_attr_t const *attr_net_dst;
static fr_dict_attr_t const *attr_net_dst_ip;
static fr_dict_attr_t const *attr_net_dst_port;
static fr_dict_attr_t const *attr_net_timestamp;
 
extern fr_dict_attr_autoload_t util_packet_dict_attr[];
fr_dict_attr_autoload_t util_packet_dict_attr[] = {
        { .out = &attr_net, .name = "Net", .type = FR_TYPE_TLV, .dict = &dict_freeradius },
        { .out = &attr_net_src, .name = "Net.Src", .type = FR_TYPE_TLV, .dict = &dict_freeradius },
        { .out = &attr_net_dst, .name = "Net.Dst", .type = FR_TYPE_TLV, .dict = &dict_freeradius },
        { .out = &attr_net_src_ip, .name = "Net.Src.IP", .type = FR_TYPE_COMBO_IP_ADDR, .dict = &dict_freeradius },
        { .out = &attr_net_src_port, .name = "Net.Src.Port", .type = FR_TYPE_UINT16, .dict = &dict_freeradius },
        { .out = &attr_net_dst_ip, .name = "Net.Dst.IP", .type = FR_TYPE_COMBO_IP_ADDR, .dict = &dict_freeradius },
        { .out = &attr_net_dst_port, .name = "Net.Dst.Port", .type = FR_TYPE_UINT16, .dict = &dict_freeradius },
        { .out = &attr_net_timestamp, .name = "Net.Timestamp", .type = FR_TYPE_DATE, .dict = &dict_freeradius },
 
        { NULL }
};
 
static int inet2pairs(TALLOC_CTX *ctx, fr_pair_list_t *list,
                      fr_dict_attr_t const *attr_ip, fr_dict_attr_t const *attr_port,
                      fr_ipaddr_t const *ipaddr, uint16_t port)
{
        fr_pair_t *vp;
 
        if (fr_pair_find_or_append_by_da(ctx, &vp, list, attr_ip) < 0) return -1;
        fr_value_box_ipaddr(&vp->data, attr_ip, ipaddr, false);
        fr_pair_set_immutable(vp);
 
        if (fr_pair_find_or_append_by_da(ctx, &vp, list, attr_port) < 0) return -1;
        vp->vp_uint16 = port;
        fr_pair_set_immutable(vp);
 
        return 0;
}
 
/** Allocate a "Net." struct with src/dst host and port.
 *
 * @param      ctx    The context in which the packet is allocated.
 * @param[in]  list   #fr_pair_list_t value to resolve to #fr_packet_t.
 * @param[out] packet The request packet.
 *
 * @return
 *      -  0 on success
 *      - <0 on error.
 */
int fr_packet_pairs_from_packet(TALLOC_CTX *ctx, fr_pair_list_t *list, fr_packet_t const *packet)
{
        fr_pair_t *vp, *net, *tlv;
 
        /*
         *      Net
         */
        if (fr_pair_find_or_append_by_da(ctx, &net, list, attr_net) < 0) return -1;
 
        /*
         *      Net.Src
         */
        if (fr_pair_find_or_append_by_da(net, &tlv, &net->vp_group, attr_net_src) < 0) return -1;
 
        if (inet2pairs(tlv, &tlv->vp_group, attr_net_src_ip, attr_net_src_port, &packet->socket.inet.src_ipaddr, packet->socket.inet.src_port) < 0) return -1;
 
        /*
         *      Net.Dst
         */
        if (fr_pair_find_or_append_by_da(net, &tlv, &net->vp_group, attr_net_dst) < 0) return -1;
 
        if (inet2pairs(tlv, &tlv->vp_group, attr_net_dst_ip, attr_net_dst_port, &packet->socket.inet.dst_ipaddr, packet->socket.inet.dst_port) < 0) return -1;
 
        /*
         *      Timestamp
         */
        if (fr_pair_find_or_append_by_da(net, &vp, &net->vp_group, attr_net_timestamp) < 0) return -1;
        vp->vp_date = fr_time_to_unix_time(packet->timestamp);
        fr_pair_set_immutable(vp);
 
        return 0;
}
 
static void pairs2inet(fr_ipaddr_t *ipaddr, uint16_t *port, fr_pair_list_t const *list,
                       fr_dict_attr_t const *attr_ip, fr_dict_attr_t const *attr_port)
{
        fr_pair_t *vp;
 
        vp = fr_pair_find_by_da(list, NULL, attr_ip);
        if (vp) *ipaddr = vp->vp_ip;
 
        vp = fr_pair_find_by_da(list, NULL, attr_port);
        if (vp) *port = vp->vp_uint16;
}
 
/** Convert pairs to information in a packet.
 *
 * @param packet        the packet to send
 * @param list          the list to check for Net.*
 */
void fr_packet_pairs_to_packet(fr_packet_t *packet, fr_pair_list_t const *list)
{
        fr_pair_t *net, *tlv;
 
        net = fr_pair_find_by_da(list, NULL, attr_net);
        if (!net) return;
 
        tlv = fr_pair_find_by_da(&net->vp_group, NULL, attr_net_src);
        if (tlv) {
                pairs2inet(&packet->socket.inet.src_ipaddr, &packet->socket.inet.src_port, &tlv->vp_group,
                           attr_net_src_ip, attr_net_src_port);
        }
 
        tlv = fr_pair_find_by_da(&net->vp_group, NULL, attr_net_dst);
        if (tlv) {
                pairs2inet(&packet->socket.inet.dst_ipaddr, &packet->socket.inet.dst_port, &tlv->vp_group,
                           attr_net_dst_ip, attr_net_dst_port);
        }
}
 
/** Initialises the Net. packet attributes.
 *
 * @note Call packet_global_free() when the server is done to avoid leaks.
 * @return
 *      - 0 on success.
 *      - -1 on failure.
 */
int packet_global_init(void)
{
        if (fr_dict_autoload(util_packet_dict) < 0) {
        error:
                fr_perror("packet_global_init");
                return -1;
        }
 
        if (fr_dict_attr_autoload(util_packet_dict_attr) < 0) goto error;
 
        return 0;
}
 
void packet_global_free(void)
{
        fr_dict_autofree(util_packet_dict);
}