source: mainline/uspace/lib/c/generic/inetping.c@ b2f542a

/*
 * Copyright (c) 2013 Jiri Svoboda
 * Copyright (c) 2013 Martin Decky
 * 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.
 */

#include <async.h>
#include <assert.h>
#include <errno.h>
#include <inet/inetping.h>
#include <ipc/inet.h>
#include <ipc/services.h>
#include <loc.h>
#include <stdlib.h>
#include <str.h>

static void inetping_cb_conn(ipc_callid_t, ipc_call_t *, void *);
static void inetping_ev_recv(ipc_callid_t, ipc_call_t *);

static async_sess_t *inetping_sess = NULL;
static inetping_ev_ops_t *inetping_ev_ops;

int inetping_init(inetping_ev_ops_t *ev_ops)
{
        service_id_t inetping_svc;
        int rc;

        assert(inetping_sess == NULL);

        inetping_ev_ops = ev_ops;

        rc = loc_service_get_id(SERVICE_NAME_INET, &inetping_svc,
            IPC_FLAG_BLOCKING);
        if (rc != EOK)
                return ENOENT;

        inetping_sess = loc_service_connect(inetping_svc, INTERFACE_INETPING,
            IPC_FLAG_BLOCKING);
        if (inetping_sess == NULL)
                return ENOENT;

        async_exch_t *exch = async_exchange_begin(inetping_sess);

        port_id_t port;
        rc = async_create_callback_port(exch, INTERFACE_INETPING_CB, 0, 0,
            inetping_cb_conn, NULL, &port);
        
        async_exchange_end(exch);

        if (rc != EOK) {
                async_hangup(inetping_sess);
                inetping_sess = NULL;
                return rc;
        }

        return EOK;
}

int inetping_send(inetping_sdu_t *sdu)
{
        async_exch_t *exch = async_exchange_begin(inetping_sess);

        ipc_call_t answer;
        aid_t req = async_send_1(exch, INETPING_SEND, sdu->seq_no, &answer);

        int rc = async_data_write_start(exch, &sdu->src, sizeof(sdu->src));
        if (rc != EOK) {
                async_exchange_end(exch);
                async_forget(req);
                return rc;
        }

        rc = async_data_write_start(exch, &sdu->dest, sizeof(sdu->dest));
        if (rc != EOK) {
                async_exchange_end(exch);
                async_forget(req);
                return rc;
        }

        rc = async_data_write_start(exch, sdu->data, sdu->size);

        async_exchange_end(exch);

        if (rc != EOK) {
                async_forget(req);
                return rc;
        }

        sysarg_t retval;
        async_wait_for(req, &retval);

        return (int) retval;
}

int inetping_get_srcaddr(const inet_addr_t *remote, inet_addr_t *local)
{
        async_exch_t *exch = async_exchange_begin(inetping_sess);

        ipc_call_t answer;
        aid_t req = async_send_0(exch, INETPING_GET_SRCADDR, &answer);

        int rc = async_data_write_start(exch, remote, sizeof(*remote));
        if (rc != EOK) {
                async_exchange_end(exch);
                async_forget(req);
                return rc;
        }

        ipc_call_t answer_local;
        aid_t req_local = async_data_read(exch, local, sizeof(*local),
            &answer_local);

        async_exchange_end(exch);

        sysarg_t retval_local;
        async_wait_for(req_local, &retval_local);

        if (retval_local != EOK) {
                async_forget(req);
                return (int) retval_local;
        }

        sysarg_t retval;
        async_wait_for(req, &retval);

        return (int) retval;
}

static void inetping_ev_recv(ipc_callid_t iid, ipc_call_t *icall)
{
        inetping_sdu_t sdu;

        sdu.seq_no = IPC_GET_ARG1(*icall);

        ipc_callid_t callid;
        size_t size;
        if (!async_data_write_receive(&callid, &size)) {
                async_answer_0(callid, EREFUSED);
                async_answer_0(iid, EREFUSED);
                return;
        }

        if (size != sizeof(sdu.src)) {
                async_answer_0(callid, EINVAL);
                async_answer_0(iid, EINVAL);
                return;
        }

        int rc = async_data_write_finalize(callid, &sdu.src, size);
        if (rc != EOK) {
                async_answer_0(callid, rc);
                async_answer_0(iid, rc);
                return;
        }

        if (!async_data_write_receive(&callid, &size)) {
                async_answer_0(callid, EREFUSED);
                async_answer_0(iid, EREFUSED);
                return;
        }

        if (size != sizeof(sdu.dest)) {
                async_answer_0(callid, EINVAL);
                async_answer_0(iid, EINVAL);
                return;
        }

        rc = async_data_write_finalize(callid, &sdu.dest, size);
        if (rc != EOK) {
                async_answer_0(callid, rc);
                async_answer_0(iid, rc);
                return;
        }

        rc = async_data_write_accept(&sdu.data, false, 0, 0, 0, &sdu.size);
        if (rc != EOK) {
                async_answer_0(iid, rc);
                return;
        }

        rc = inetping_ev_ops->recv(&sdu);
        free(sdu.data);
        async_answer_0(iid, rc);
}

static void inetping_cb_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);

                if (!IPC_GET_IMETHOD(call)) {
                        /* TODO: Handle hangup */
                        return;
                }

                switch (IPC_GET_IMETHOD(call)) {
                case INETPING_EV_RECV:
                        inetping_ev_recv(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOTSUP);
                }
        }
}

/** @}
 */