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  1. /*
  2.  * Copyright (C) 2006 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /**
  30.  * @file    ns.c
  31.  * @brief   Naming service for HelenOS IPC.
  32.  */
  33.  
  34. #include <ipc/ipc.h>
  35. #include <ipc/ns.h>
  36. #include <stdio.h>
  37. #include <unistd.h>
  38. #include <stdlib.h>
  39. #include <errno.h>
  40. #include <assert.h>
  41. #include <libadt/list.h>
  42. #include <libadt/hash_table.h>
  43. #include <sysinfo.h>
  44. #include <ddi.h>
  45. #include <as.h>
  46.  
  47. #define NAME    "NS"
  48.  
  49. #define NS_HASH_TABLE_CHAINS    20
  50.  
  51. static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);
  52. static int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid);
  53.  
  54. /* Static functions implementing NS hash table operations. */
  55. static hash_index_t ns_hash(unsigned long *key);
  56. static int ns_compare(unsigned long *key, hash_count_t keys, link_t *item);
  57. static void ns_remove(link_t *item);
  58.  
  59. /** Operations for NS hash table. */
  60. static hash_table_operations_t ns_hash_table_ops = {
  61.     .hash = ns_hash,
  62.     .compare = ns_compare,
  63.     .remove_callback = ns_remove
  64. };
  65.  
  66. /** NS hash table structure. */
  67. static hash_table_t ns_hash_table;
  68.  
  69. /** NS hash table item. */
  70. typedef struct {
  71.     link_t link;
  72.     ipcarg_t service;       /**< Number of the service. */
  73.     ipcarg_t phone;         /**< Phone registered with the service. */
  74.     ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
  75. } hashed_service_t;
  76.  
  77. int static ping_phone;
  78.  
  79. static void get_realtime_as(ipc_callid_t callid, ipc_call_t *call)
  80. {
  81.     static void *addr = NULL;
  82.     void *ph_addr;
  83.  
  84.     if (!addr) {
  85.         ph_addr = (void *)sysinfo_value("clock.faddr");
  86.         if (!ph_addr) {
  87.             ipc_answer_fast(callid, ENOENT, 0, 0);
  88.             return;
  89.         }
  90.         addr = as_get_mappable_page(PAGE_SIZE);
  91.         map_physmem(ph_addr, addr, 1, AS_AREA_READ | AS_AREA_CACHEABLE);
  92.     }
  93.     ipc_answer_fast(callid, 0, (ipcarg_t)addr, AS_AREA_READ | AS_AREA_CACHEABLE);
  94. }
  95.  
  96. int main(int argc, char **argv)
  97. {
  98.     ipc_call_t call;
  99.     ipc_callid_t callid;
  100.     char *as_area;
  101.    
  102.     ipcarg_t retval, arg1, arg2;
  103.  
  104. //  printf("%s: Naming service started.\n", NAME);
  105.    
  106.     if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, &ns_hash_table_ops)) {
  107. //      printf("%s: cannot create hash table\n", NAME);
  108.         return ENOMEM;
  109.     }
  110.        
  111.     while (1) {
  112.         callid = ipc_wait_for_call(&call);
  113. //      printf("NS: Call in_phone_hash=%lX...", call.in_phone_hash);
  114.         switch (IPC_GET_METHOD(call)) {
  115.         case IPC_M_AS_AREA_SEND:
  116.             as_area = (char *)IPC_GET_ARG1(call);
  117. //          printf("Received as_area: %P, size:%d\n", as_area, IPC_GET_ARG2(call));
  118.             retval = ipc_answer_fast(callid, 0,(sysarg_t)(1024*1024), 0);
  119.             if (!retval) {
  120. //              printf("Reading shared memory...");
  121. //              printf("Text: %s", as_area);
  122.             } else
  123. //              printf("Failed answer: %d\n", retval);
  124.             continue;
  125.         case IPC_M_AS_AREA_RECV:
  126.             get_realtime_as(callid, &call);
  127.             continue;
  128.         case IPC_M_INTERRUPT:
  129.             break;
  130.         case IPC_M_PHONE_HUNGUP:
  131.             retval = 0;
  132.             break;
  133.         case IPC_M_CONNECT_TO_ME:
  134.             /*
  135.              * Server requests service registration.
  136.              */
  137.             retval = register_service(IPC_GET_ARG1(call), IPC_GET_ARG3(call), &call);
  138.             ping_phone = IPC_GET_ARG3(call);
  139.             break;
  140.         case IPC_M_CONNECT_ME_TO:
  141.             /*
  142.              * Client requests to be connected to a service.
  143.              */
  144.             retval = connect_to_service(IPC_GET_ARG1(call), &call, callid);
  145.             break;
  146.         case NS_HANGUP:
  147. //          printf("Closing connection.\n");
  148.             retval = EHANGUP;
  149.             break;
  150.         case NS_PING:
  151. //          printf("Ping...%P %P\n", IPC_GET_ARG1(call),
  152. //                 IPC_GET_ARG2(call));
  153.             retval = 0;
  154.             arg1 = 0xdead;
  155.             arg2 = 0xbeef;
  156.             break;
  157.         case NS_PING_SVC:
  158. //          printf("NS:Pinging service %d\n", ping_phone);
  159.             ipc_call_sync(ping_phone, NS_PING, 0xbeef, 0);
  160. //          printf("NS:Got pong\n");
  161.             break;
  162.         default:
  163. //          printf("Unknown method: %zd\n", IPC_GET_METHOD(call));
  164.             retval = ENOENT;
  165.             break;
  166.         }
  167.         if (! (callid & IPC_CALLID_NOTIFICATION)) {
  168. //          printf("Answering.\n");
  169.             ipc_answer_fast(callid, retval, arg1, arg2);
  170.         }
  171.     }
  172. }
  173.  
  174. /** Register service.
  175.  *
  176.  * @param service Service to be registered.
  177.  * @param phone phone Phone to be used for connections to the service.
  178.  * @param call Pointer to call structure.
  179.  *
  180.  * @return Zero on success or a value from @ref errno.h.
  181.  */
  182. int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
  183. {
  184.     unsigned long keys[3] = { service, call->in_phone_hash, 0 };
  185.     hashed_service_t *hs;
  186.            
  187. //  printf("Registering service %d on phone %d...", service, phone);
  188.  
  189.     if (hash_table_find(&ns_hash_table, keys)) {
  190. //      printf("Service %d already registered.\n", service);
  191.         return EEXISTS;
  192.     }
  193.            
  194.     hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
  195.     if (!hs) {
  196. //      printf("Failed to register service %d.\n", service);
  197.         return ENOMEM;
  198.     }
  199.            
  200.     link_initialize(&hs->link);
  201.     hs->service = service;
  202.     hs->phone = phone;
  203.     hs->in_phone_hash = call->in_phone_hash;
  204.     hash_table_insert(&ns_hash_table, keys, &hs->link);
  205.            
  206.     return 0;
  207. }
  208.  
  209. /** Connect client to service.
  210.  *
  211.  * @param service Service to be connected to.
  212.  * @param call Pointer to call structure.
  213.  * @param callid Call ID of the request.
  214.  *
  215.  * @return Zero on success or a value from @ref errno.h.
  216.  */
  217. int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
  218. {
  219.     unsigned long keys[3] = { service, 0, 0 };
  220.     link_t *hlp;
  221.     hashed_service_t *hs;
  222.            
  223.     hlp = hash_table_find(&ns_hash_table, keys);
  224.     if (!hlp) {
  225. //      printf("Service %d not registered.\n", service);
  226.         return ENOENT;
  227.     }
  228.     hs = hash_table_get_instance(hlp, hashed_service_t, link);
  229. //  printf("Connecting in_phone_hash=%lX to service at phone %d...", call->in_phone_hash, hs->phone);
  230.     return ipc_forward_fast(callid, hs->phone, 0, 0);
  231. }
  232.  
  233. /** Compute hash index into NS hash table.
  234.  *
  235.  * @param key Pointer keys. However, only the first key (i.e. service number)
  236.  *        is used to compute the hash index.
  237.  * @return Hash index corresponding to key[0].
  238.  */
  239. hash_index_t ns_hash(unsigned long *key)
  240. {
  241.     assert(key);
  242.     return *key % NS_HASH_TABLE_CHAINS;
  243. }
  244.  
  245. /** Compare a key with hashed item.
  246.  *
  247.  * This compare function always ignores the third key.
  248.  * It exists only to make it possible to remove records
  249.  * originating from connection with key[1] in_phone_hash
  250.  * value. Note that this is close to being classified
  251.  * as a nasty hack.
  252.  *
  253.  * @param key Array of keys.
  254.  * @param keys Must be lesser or equal to 3.
  255.  * @param item Pointer to a hash table item.
  256.  * @return Non-zero if the key matches the item, zero otherwise.
  257.  */
  258. int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
  259. {
  260.     hashed_service_t *hs;
  261.  
  262.     assert(key);
  263.     assert(keys <= 3);
  264.     assert(item);
  265.    
  266.     hs = hash_table_get_instance(item, hashed_service_t, link);
  267.    
  268.     if (keys == 2)
  269.         return key[1] == hs->in_phone_hash;
  270.     else
  271.         return key[0] == hs->service;
  272. }
  273.  
  274. /** Perform actions after removal of item from the hash table.
  275.  *
  276.  * @param item Item that was removed from the hash table.
  277.  */
  278. void ns_remove(link_t *item)
  279. {
  280.     assert(item);
  281.     free(hash_table_get_instance(item, hashed_service_t, link));
  282. }
  283.