source: mainline/uspace/srv/net/dhcp/transport.c@ 1b0602a3

/*
 * Copyright (c) 2013 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup dhcp
 * @{
 */
/**
 * @file
 * @brief DHCP client
 */

#include <bitops.h>
#include <inet/addr.h>
#include <inet/dnsr.h>
#include <inet/inetcfg.h>
#include <io/log.h>
#include <loc.h>
#include <net/in.h>
#include <net/inet.h>
#include <net/socket.h>
#include <stdio.h>
#include <stdlib.h>

#include "dhcp.h"
#include "dhcp_std.h"
#include "transport.h"

#define MAX_MSG_SIZE 1024
static uint8_t msgbuf[MAX_MSG_SIZE];

typedef struct {
        /** Message type */
        enum dhcp_msg_type msg_type;
        /** Offered address */
        inet_naddr_t oaddr;
        /** Server address */
        inet_addr_t srv_addr;
        /** Router address */
        inet_addr_t router;
        /** DNS server */
        inet_addr_t dns_server;
} dhcp_offer_t;

static int dhcp_recv_fibril(void *);

int dhcp_send(dhcp_transport_t *dt, void *msg, size_t size)
{
        struct sockaddr_in addr;
        int rc;

        addr.sin_family = AF_INET;
        addr.sin_port = htons(dhcp_server_port);
        addr.sin_addr.s_addr = htonl(addr32_broadcast_all_hosts);

        rc = sendto(dt->fd, msg, size, 0,
            (struct sockaddr *)&addr, sizeof(addr));
        if (rc != EOK) {
                log_msg(LOG_DEFAULT, LVL_ERROR, "Sending failed");
                return rc;
        }

        return EOK;
}

static int dhcp_recv_msg(dhcp_transport_t *dt, void **rmsg, size_t *rsize)
{
        struct sockaddr_in src_addr;
        socklen_t src_addr_size;
        size_t recv_size;
        int rc;

        src_addr_size = sizeof(src_addr);
        rc = recvfrom(dt->fd, msgbuf, MAX_MSG_SIZE, 0,
            (struct sockaddr *)&src_addr, &src_addr_size);
        if (rc < 0) {
                log_msg(LOG_DEFAULT, LVL_ERROR, "recvfrom failed (%d)", rc);
                return rc;
        }

        recv_size = (size_t)rc;
        *rmsg = msgbuf;
        *rsize = recv_size;

        return EOK;
}

int dhcp_transport_init(dhcp_transport_t *dt, service_id_t link_id,
    dhcp_recv_cb_t recv_cb, void *arg)
{
        int fd;
        struct sockaddr_in laddr;
        int fid;
        int rc;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "dhcptransport_init()");

        laddr.sin_family = AF_INET;
        laddr.sin_port = htons(dhcp_client_port);
        laddr.sin_addr.s_addr = INADDR_ANY;

        fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
        if (fd < 0) {
                rc = EIO;
                goto error;
        }

        log_msg(LOG_DEFAULT, LVL_DEBUG, "Bind socket.");
        rc = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
        if (rc != EOK) {
                rc = EIO;
                goto error;
        }

        log_msg(LOG_DEFAULT, LVL_DEBUG, "Set socket options");
        rc = setsockopt(fd, SOL_SOCKET, SO_IPLINK, &link_id, sizeof(link_id));
        if (rc != EOK) {
                rc = EIO;
                goto error;
        }

        dt->fd = fd;
        dt->recv_cb = recv_cb;
        dt->cb_arg = arg;

        fid = fibril_create(dhcp_recv_fibril, dt);
        if (fid == 0) {
                rc = ENOMEM;
                goto error;
        }

        dt->recv_fid = fid;
        fibril_add_ready(fid);

        return EOK;
error:
        closesocket(fd);
        return rc;
}

void dhcp_transport_fini(dhcp_transport_t *dt)
{
        closesocket(dt->fd);
}

static int dhcp_recv_fibril(void *arg)
{
        dhcp_transport_t *dt = (dhcp_transport_t *)arg;
        void *msg;
        size_t size;
        int rc;

        while (true) {
                rc = dhcp_recv_msg(dt, &msg, &size);
                if (rc != EOK)
                        break;

                dt->recv_cb(dt->cb_arg, msg, size);
        }

        return EOK;
}

/** @}
 */