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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>
1030 palkovsky 42
#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, ipc_callid_t callid);
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1335 jermar 60
/* 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 63
static void ns_remove(link_t *item);
1335 jermar 64
 
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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 69
    .remove_callback = ns_remove
1335 jermar 70
};
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72
/** 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 80
    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
1335 jermar 81
} hashed_service_t;
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1596 palkovsky 83
static void *clockaddr = NULL;
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static void *klogaddr = NULL;
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2015 jermar 86
static void get_as_area(ipc_callid_t callid, ipc_call_t *call, char *name, char *colstr, void **addr)
1435 palkovsky 87
{
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    void *ph_addr;
2015 jermar 89
    int ph_color;
1435 palkovsky 90
 
1596 palkovsky 91
    if (!*addr) {
2015 jermar 92
        ph_addr = (void *) sysinfo_value(name);
1435 palkovsky 93
        if (!ph_addr) {
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            ipc_answer_fast(callid, ENOENT, 0, 0);
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            return;
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        }
2015 jermar 97
        ph_color = (int) sysinfo_value(colstr);
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        *addr = as_get_mappable_page(PAGE_SIZE, ph_color);
2012 jermar 99
        physmem_map(ph_addr, *addr, 1, AS_AREA_READ | AS_AREA_CACHEABLE);
1435 palkovsky 100
    }
2012 jermar 101
    ipc_answer_fast(callid, 0, (ipcarg_t) *addr, AS_AREA_READ);
1435 palkovsky 102
}
103
 
1030 palkovsky 104
int main(int argc, char **argv)
105
{
106
    ipc_call_t call;
107
    ipc_callid_t callid;
108
 
1719 decky 109
    ipcarg_t retval;
1030 palkovsky 110
 
1336 jermar 111
    if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, &ns_hash_table_ops)) {
1335 jermar 112
        return ENOMEM;
113
    }
1343 jermar 114
 
1030 palkovsky 115
    while (1) {
1365 jermar 116
        callid = ipc_wait_for_call(&call);
1091 palkovsky 117
        switch (IPC_GET_METHOD(call)) {
1435 palkovsky 118
        case IPC_M_AS_AREA_RECV:
1596 palkovsky 119
            switch (IPC_GET_ARG3(call)) {
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            case SERVICE_MEM_REALTIME:
2015 jermar 121
                get_as_area(callid, &call, "clock.faddr",
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                    "clock.fcolor", &clockaddr);
1596 palkovsky 123
                break;
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            case SERVICE_MEM_KLOG:
2015 jermar 125
                get_as_area(callid, &call, "klog.faddr",
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                    "klog.fcolor", &klogaddr);
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                break;
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            default:
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                ipc_answer_fast(callid, ENOENT, 0, 0);
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            }
1435 palkovsky 131
            continue;
1089 palkovsky 132
        case IPC_M_PHONE_HUNGUP:
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            retval = 0;
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            break;
1336 jermar 135
        case IPC_M_CONNECT_TO_ME:
1335 jermar 136
            /*
1336 jermar 137
             * Server requests service registration.
1335 jermar 138
             */
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            retval = register_service(IPC_GET_ARG1(call), IPC_GET_ARG3(call), &call);
1030 palkovsky 140
            break;
1089 palkovsky 141
        case IPC_M_CONNECT_ME_TO:
1336 jermar 142
            /*
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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 146
            break;
1030 palkovsky 147
        default:
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            retval = ENOENT;
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            break;
150
        }
1282 palkovsky 151
        if (! (callid & IPC_CALLID_NOTIFICATION)) {
1719 decky 152
            ipc_answer_fast(callid, retval, 0, 0);
1282 palkovsky 153
        }
1030 palkovsky 154
    }
155
}
1335 jermar 156
 
1338 jermar 157
/** Register service.
1336 jermar 158
 *
159
 * @param service Service to be registered.
160
 * @param phone phone Phone to be used for connections to the service.
161
 * @param call Pointer to call structure.
162
 *
163
 * @return Zero on success or a value from @ref errno.h.
164
 */
165
int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
166
{
167
    unsigned long keys[3] = { service, call->in_phone_hash, 0 };
168
    hashed_service_t *hs;
169
 
170
    if (hash_table_find(&ns_hash_table, keys)) {
171
        return EEXISTS;
172
    }
173
 
174
    hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
175
    if (!hs) {
176
        return ENOMEM;
177
    }
178
 
179
    link_initialize(&hs->link);
180
    hs->service = service;
181
    hs->phone = phone;
182
    hs->in_phone_hash = call->in_phone_hash;
183
    hash_table_insert(&ns_hash_table, keys, &hs->link);
184
 
185
    return 0;
186
}
187
 
188
/** Connect client to service.
189
 *
190
 * @param service Service to be connected to.
191
 * @param call Pointer to call structure.
192
 * @param callid Call ID of the request.
193
 *
194
 * @return Zero on success or a value from @ref errno.h.
195
 */
196
int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
197
{
198
    unsigned long keys[3] = { service, 0, 0 };
199
    link_t *hlp;
200
    hashed_service_t *hs;
201
 
202
    hlp = hash_table_find(&ns_hash_table, keys);
203
    if (!hlp) {
204
        return ENOENT;
205
    }
206
    hs = hash_table_get_instance(hlp, hashed_service_t, link);
207
    return ipc_forward_fast(callid, hs->phone, 0, 0);
208
}
209
 
1335 jermar 210
/** Compute hash index into NS hash table.
211
 *
1336 jermar 212
 * @param key Pointer keys. However, only the first key (i.e. service number)
213
 *        is used to compute the hash index.
214
 * @return Hash index corresponding to key[0].
1335 jermar 215
 */
216
hash_index_t ns_hash(unsigned long *key)
217
{
218
    assert(key);
219
    return *key % NS_HASH_TABLE_CHAINS;
220
}
221
 
222
/** Compare a key with hashed item.
223
 *
1336 jermar 224
 * This compare function always ignores the third key.
225
 * It exists only to make it possible to remove records
226
 * originating from connection with key[1] in_phone_hash
227
 * value. Note that this is close to being classified
228
 * as a nasty hack.
229
 *
230
 * @param key Array of keys.
231
 * @param keys Must be lesser or equal to 3.
1335 jermar 232
 * @param item Pointer to a hash table item.
233
 * @return Non-zero if the key matches the item, zero otherwise.
234
 */
1336 jermar 235
int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
1335 jermar 236
{
237
    hashed_service_t *hs;
238
 
239
    assert(key);
1336 jermar 240
    assert(keys <= 3);
1335 jermar 241
    assert(item);
242
 
243
    hs = hash_table_get_instance(item, hashed_service_t, link);
244
 
1336 jermar 245
    if (keys == 2)
246
        return key[1] == hs->in_phone_hash;
247
    else
248
        return key[0] == hs->service;
1335 jermar 249
}
1336 jermar 250
 
251
/** Perform actions after removal of item from the hash table.
252
 *
253
 * @param item Item that was removed from the hash table.
254
 */
255
void ns_remove(link_t *item)
256
{
257
    assert(item);
258
    free(hash_table_get_instance(item, hashed_service_t, link));
259
}
1719 decky 260
 
1649 cejka 261
/**
262
 * @}
263
 */