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1335 jermar 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/**
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 * @file    ns.c
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 * @brief   Naming service for HelenOS IPC.
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 */
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1030 palkovsky 34
#include <ipc.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ns.h>
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#include <errno.h>
1335 jermar 40
#include <assert.h>
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#include <libadt/list.h>
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#include <libadt/hash_table.h>
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#define NAME    "NS"
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#define NS_HASH_TABLE_CHAINS    20
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1336 jermar 48
static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);
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static int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid);
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1335 jermar 51
/* Static functions implementing NS hash table operations. */
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static hash_index_t ns_hash(unsigned long *key);
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static int ns_compare(unsigned long *key, hash_count_t keys, link_t *item);
1336 jermar 54
static void ns_remove(link_t *item);
1335 jermar 55
 
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/** Operations for NS hash table. */
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static hash_table_operations_t ns_hash_table_ops = {
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    .hash = ns_hash,
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    .compare = ns_compare,
1336 jermar 60
    .remove_callback = ns_remove
1335 jermar 61
};
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/** NS hash table structure. */
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static hash_table_t ns_hash_table;
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/** NS hash table item. */
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typedef struct {
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    link_t link;
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    ipcarg_t service;       /**< Number of the service. */
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    ipcarg_t phone;         /**< Phone registered with the service. */
1336 jermar 71
    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
1335 jermar 72
} hashed_service_t;
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int static ping_phone;
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1030 palkovsky 76
int main(int argc, char **argv)
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{
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    ipc_call_t call;
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    ipc_callid_t callid;
1330 palkovsky 80
    char *as;
1030 palkovsky 81
 
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    ipcarg_t retval, arg1, arg2;
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1338 jermar 84
    printf("%s: Naming service started.\n", NAME);
1335 jermar 85
 
1336 jermar 86
    if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, &ns_hash_table_ops)) {
1335 jermar 87
        printf("%s: cannot create hash table\n", NAME);
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        return ENOMEM;
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    }
1343 jermar 90
 
1030 palkovsky 91
    while (1) {
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        callid = ipc_wait_for_call(&call, 0);
1343 jermar 93
//      printf("NS: Call in_phone_hash=%lX...", call.in_phone_hash);
1091 palkovsky 94
        switch (IPC_GET_METHOD(call)) {
1330 palkovsky 95
        case IPC_M_AS_SEND:
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            as = (char *)IPC_GET_ARG2(call);
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            printf("Received as: %P, size:%d\n", as, IPC_GET_ARG3(call));
1343 jermar 98
            retval = ipc_answer_fast(callid, 0,(sysarg_t)(1024*1024), 0);
1330 palkovsky 99
            if (!retval) {
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                printf("Reading shared memory...");
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                printf("Text: %s", as);
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            } else
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                printf("Failed answer: %d\n", retval);
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            continue;
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            break;
1259 palkovsky 106
        case IPC_M_INTERRUPT:
1282 palkovsky 107
            printf("GOT INTERRUPT: %c\n", IPC_GET_ARG2(call));
1259 palkovsky 108
            break;
1089 palkovsky 109
        case IPC_M_PHONE_HUNGUP:
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            printf("Phone hung up.\n");
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            retval = 0;
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            break;
1336 jermar 113
        case IPC_M_CONNECT_TO_ME:
1335 jermar 114
            /*
1336 jermar 115
             * Server requests service registration.
1335 jermar 116
             */
1336 jermar 117
            retval = register_service(IPC_GET_ARG1(call), IPC_GET_ARG3(call), &call);
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            ping_phone = IPC_GET_ARG3(call);
1030 palkovsky 119
            break;
1089 palkovsky 120
        case IPC_M_CONNECT_ME_TO:
1336 jermar 121
            /*
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             * Client requests to be connected to a service.
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             */
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            retval = connect_to_service(IPC_GET_ARG1(call), &call, callid);
1061 palkovsky 125
            break;
1338 jermar 126
        case NS_HANGUP:
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            printf("Closing connection.\n");
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            retval = EHANGUP;
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            break;
1030 palkovsky 130
        case NS_PING:
1091 palkovsky 131
            printf("Ping...%P %P\n", IPC_GET_ARG1(call),
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                   IPC_GET_ARG2(call));
1030 palkovsky 133
            retval = 0;
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            arg1 = 0xdead;
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            arg2 = 0xbeef;
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            break;
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        case NS_PING_SVC:
1335 jermar 138
            printf("NS:Pinging service %d\n", ping_phone);
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            ipc_call_sync(ping_phone, NS_PING, 0xbeef, 0);
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            printf("NS:Got pong\n");
1030 palkovsky 141
            break;
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        default:
1091 palkovsky 143
            printf("Unknown method: %zd\n", IPC_GET_METHOD(call));
1030 palkovsky 144
            retval = ENOENT;
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            break;
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        }
1282 palkovsky 147
        if (! (callid & IPC_CALLID_NOTIFICATION)) {
1343 jermar 148
//          printf("Answering.\n");
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            ipc_answer_fast(callid, retval, arg1, arg2);
1282 palkovsky 150
        }
1030 palkovsky 151
    }
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}
1335 jermar 153
 
1338 jermar 154
/** Register service.
1336 jermar 155
 *
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 * @param service Service to be registered.
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 * @param phone phone Phone to be used for connections to the service.
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 * @param call Pointer to call structure.
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 *
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 * @return Zero on success or a value from @ref errno.h.
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 */
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int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
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{
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    unsigned long keys[3] = { service, call->in_phone_hash, 0 };
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    hashed_service_t *hs;
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    printf("Registering service %d on phone %d...", service, phone);
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    if (hash_table_find(&ns_hash_table, keys)) {
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        printf("Service %d already registered.\n", service);
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        return EEXISTS;
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    }
173
 
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    hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
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    if (!hs) {
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        printf("Failed to register service %d.\n", service);
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        return ENOMEM;
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    }
179
 
180
    link_initialize(&hs->link);
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    hs->service = service;
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    hs->phone = phone;
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    hs->in_phone_hash = call->in_phone_hash;
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    hash_table_insert(&ns_hash_table, keys, &hs->link);
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186
    return 0;
187
}
188
 
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/** Connect client to service.
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 *
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 * @param service Service to be connected to.
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 * @param call Pointer to call structure.
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 * @param callid Call ID of the request.
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 *
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 * @return Zero on success or a value from @ref errno.h.
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 */
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int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
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{
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    unsigned long keys[3] = { service, 0, 0 };
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    link_t *hlp;
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    hashed_service_t *hs;
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203
    hlp = hash_table_find(&ns_hash_table, keys);
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    if (!hlp) {
1343 jermar 205
//      printf("Service %d not registered.\n", service);
1336 jermar 206
        return ENOENT;
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    }
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    hs = hash_table_get_instance(hlp, hashed_service_t, link);
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    printf("Connecting in_phone_hash=%lX to service at phone %d...", call->in_phone_hash, hs->phone);
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    return ipc_forward_fast(callid, hs->phone, 0, 0);
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}
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1335 jermar 213
/** Compute hash index into NS hash table.
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 *
1336 jermar 215
 * @param key Pointer keys. However, only the first key (i.e. service number)
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 *        is used to compute the hash index.
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 * @return Hash index corresponding to key[0].
1335 jermar 218
 */
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hash_index_t ns_hash(unsigned long *key)
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{
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    assert(key);
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    return *key % NS_HASH_TABLE_CHAINS;
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}
224
 
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/** Compare a key with hashed item.
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 *
1336 jermar 227
 * This compare function always ignores the third key.
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 * It exists only to make it possible to remove records
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 * originating from connection with key[1] in_phone_hash
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 * value. Note that this is close to being classified
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 * as a nasty hack.
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 *
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 * @param key Array of keys.
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 * @param keys Must be lesser or equal to 3.
1335 jermar 235
 * @param item Pointer to a hash table item.
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 * @return Non-zero if the key matches the item, zero otherwise.
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 */
1336 jermar 238
int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
1335 jermar 239
{
240
    hashed_service_t *hs;
241
 
242
    assert(key);
1336 jermar 243
    assert(keys <= 3);
1335 jermar 244
    assert(item);
245
 
246
    hs = hash_table_get_instance(item, hashed_service_t, link);
247
 
1336 jermar 248
    if (keys == 2)
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        return key[1] == hs->in_phone_hash;
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    else
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        return key[0] == hs->service;
1335 jermar 252
}
1336 jermar 253
 
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/** Perform actions after removal of item from the hash table.
255
 *
256
 * @param item Item that was removed from the hash table.
257
 */
258
void ns_remove(link_t *item)
259
{
260
    assert(item);
261
    free(hash_table_get_instance(item, hashed_service_t, link));
262
}