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1335 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2006 Ondrej Palkovsky
1335 jermar 3
 * 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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1740 jermar 29
/** @addtogroup ns
1649 cejka 30
 * @{
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 */
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1335 jermar 33
/**
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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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1649 cejka 38
 
1353 jermar 39
#include <ipc/ipc.h>
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#include <ipc/ns.h>
1596 palkovsky 41
#include <ipc/services.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 <errno.h>
1335 jermar 46
#include <assert.h>
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#include <libadt/list.h>
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#include <libadt/hash_table.h>
1435 palkovsky 49
#include <sysinfo.h>
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#include <ddi.h>
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#include <as.h>
1335 jermar 52
 
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#define NAME    "NS"
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#define NS_HASH_TABLE_CHAINS    20
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1336 jermar 57
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,
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    ipc_callid_t callid);
1336 jermar 60
 
1335 jermar 61
/* 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 64
static void ns_remove(link_t *item);
1335 jermar 65
 
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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 70
    .remove_callback = ns_remove
1335 jermar 71
};
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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. */
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    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
1335 jermar 82
} hashed_service_t;
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static void *clockaddr = NULL;
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static void *klogaddr = NULL;
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2476 jermar 87
static void get_as_area(ipc_callid_t callid, ipc_call_t *call, char *name,
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    void **addr)
1435 palkovsky 89
{
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    void *ph_addr;
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1596 palkovsky 92
    if (!*addr) {
2015 jermar 93
        ph_addr = (void *) sysinfo_value(name);
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        if (!ph_addr) {
2588 jermar 95
            ipc_answer_fast_0(callid, ENOENT);
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            return;
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        }
2141 jermar 98
        *addr = as_get_mappable_page(PAGE_SIZE);
2588 jermar 99
        physmem_map(ph_addr, *addr, 1,
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            AS_AREA_READ | AS_AREA_CACHEABLE);
1435 palkovsky 101
    }
2588 jermar 102
    ipc_answer_fast(callid, EOK, (ipcarg_t) *addr, AS_AREA_READ);
1435 palkovsky 103
}
104
 
1030 palkovsky 105
int main(int argc, char **argv)
106
{
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    ipc_call_t call;
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    ipc_callid_t callid;
109
 
1719 decky 110
    ipcarg_t retval;
1030 palkovsky 111
 
2476 jermar 112
    if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3,
113
        &ns_hash_table_ops)) {
1335 jermar 114
        return ENOMEM;
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    }
1343 jermar 116
 
1030 palkovsky 117
    while (1) {
1365 jermar 118
        callid = ipc_wait_for_call(&call);
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        switch (IPC_GET_METHOD(call)) {
1435 palkovsky 120
        case IPC_M_AS_AREA_RECV:
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            switch (IPC_GET_ARG3(call)) {
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            case SERVICE_MEM_REALTIME:
2015 jermar 123
                get_as_area(callid, &call, "clock.faddr",
2141 jermar 124
                    &clockaddr);
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                break;
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            case SERVICE_MEM_KLOG:
2015 jermar 127
                get_as_area(callid, &call, "klog.faddr",
2141 jermar 128
                    &klogaddr);
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                break;
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            default:
2588 jermar 131
                ipc_answer_fast_0(callid, ENOENT);
1596 palkovsky 132
            }
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            continue;
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        case IPC_M_PHONE_HUNGUP:
2588 jermar 135
            retval = EOK;
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            break;
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        case IPC_M_CONNECT_TO_ME:
1335 jermar 138
            /*
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             * Server requests service registration.
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             */
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            retval = register_service(IPC_GET_ARG1(call),
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                IPC_GET_ARG3(call), &call);
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            break;
1089 palkovsky 144
        case IPC_M_CONNECT_ME_TO:
1336 jermar 145
            /*
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             * Client requests to be connected to a service.
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             */
2476 jermar 148
            retval = connect_to_service(IPC_GET_ARG1(call), &call,
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                callid);
1061 palkovsky 150
            break;
1030 palkovsky 151
        default:
152
            retval = ENOENT;
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            break;
154
        }
2476 jermar 155
        if (!(callid & IPC_CALLID_NOTIFICATION)) {
2588 jermar 156
            ipc_answer_fast_0(callid, retval);
1282 palkovsky 157
        }
1030 palkovsky 158
    }
159
}
1335 jermar 160
 
1338 jermar 161
/** Register service.
1336 jermar 162
 *
163
 * @param service Service to be registered.
2471 jermar 164
 * @param phone Phone to be used for connections to the service.
1336 jermar 165
 * @param call Pointer to call structure.
166
 *
167
 * @return Zero on success or a value from @ref errno.h.
168
 */
169
int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
170
{
2476 jermar 171
    unsigned long keys[3] = {
172
        service,
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        call->in_phone_hash,
174
 
175
    };
1336 jermar 176
    hashed_service_t *hs;
177
 
178
    if (hash_table_find(&ns_hash_table, keys)) {
179
        return EEXISTS;
180
    }
181
 
182
    hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
183
    if (!hs) {
184
        return ENOMEM;
185
    }
186
 
187
    link_initialize(&hs->link);
188
    hs->service = service;
189
    hs->phone = phone;
190
    hs->in_phone_hash = call->in_phone_hash;
191
    hash_table_insert(&ns_hash_table, keys, &hs->link);
192
 
193
    return 0;
194
}
195
 
196
/** Connect client to service.
197
 *
198
 * @param service Service to be connected to.
199
 * @param call Pointer to call structure.
200
 * @param callid Call ID of the request.
201
 *
202
 * @return Zero on success or a value from @ref errno.h.
203
 */
204
int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
205
{
206
    unsigned long keys[3] = { service, 0, 0 };
207
    link_t *hlp;
208
    hashed_service_t *hs;
209
 
210
    hlp = hash_table_find(&ns_hash_table, keys);
211
    if (!hlp) {
212
        return ENOENT;
213
    }
214
    hs = hash_table_get_instance(hlp, hashed_service_t, link);
2594 cejka 215
    return ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call), 0);
1336 jermar 216
}
217
 
1335 jermar 218
/** Compute hash index into NS hash table.
219
 *
1336 jermar 220
 * @param key Pointer keys. However, only the first key (i.e. service number)
221
 *        is used to compute the hash index.
222
 * @return Hash index corresponding to key[0].
1335 jermar 223
 */
224
hash_index_t ns_hash(unsigned long *key)
225
{
226
    assert(key);
227
    return *key % NS_HASH_TABLE_CHAINS;
228
}
229
 
230
/** Compare a key with hashed item.
231
 *
1336 jermar 232
 * This compare function always ignores the third key.
233
 * It exists only to make it possible to remove records
234
 * originating from connection with key[1] in_phone_hash
235
 * value. Note that this is close to being classified
236
 * as a nasty hack.
237
 *
238
 * @param key Array of keys.
239
 * @param keys Must be lesser or equal to 3.
1335 jermar 240
 * @param item Pointer to a hash table item.
241
 * @return Non-zero if the key matches the item, zero otherwise.
242
 */
1336 jermar 243
int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
1335 jermar 244
{
245
    hashed_service_t *hs;
246
 
247
    assert(key);
1336 jermar 248
    assert(keys <= 3);
1335 jermar 249
    assert(item);
250
 
251
    hs = hash_table_get_instance(item, hashed_service_t, link);
252
 
1336 jermar 253
    if (keys == 2)
254
        return key[1] == hs->in_phone_hash;
255
    else
256
        return key[0] == hs->service;
1335 jermar 257
}
1336 jermar 258
 
259
/** Perform actions after removal of item from the hash table.
260
 *
261
 * @param item Item that was removed from the hash table.
262
 */
263
void ns_remove(link_t *item)
264
{
265
    assert(item);
266
    free(hash_table_get_instance(item, hashed_service_t, link));
267
}
1719 decky 268
 
1649 cejka 269
/**
270
 * @}
271
 */