WINGs/host.c

   1 /*
   2  *  WINGs WMHost function library
   3  *
   4  *  Copyright (c) 1999-2003 Dan Pascu
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21
  22 #include "wconfig.h"
  23
  24 #include <unistd.h>
  25 #include <string.h>
  26 #include <netdb.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30
  31 #include "WUtil.h"
  32
  33
  34 /* For Solaris */
  35 #ifndef INADDR_NONE
  36 # define INADDR_NONE  (-1)
  37 #endif
  38
  39 /* Max hostname length (RFC  1123) */
  40 #define W_MAXHOSTNAMELEN        255
  41
  42
  43 typedef struct W_Host {
  44     char   *name;
  45
  46     WMArray  *names;
  47     WMArray  *addresses;
  48
  49     int    refCount;
  50 } W_Host;
  51
  52
  53 static WMHashTable *hostCache = NULL;
  54
  55 static Bool hostCacheEnabled = True;
  56
  57
  58
  59 static WMHost*
  60 getHostFromCache(char *name)
  61 {
  62     if (!hostCache)
  63         return NULL;
  64
  65     return WMHashGet(hostCache, name);
  66 }
  67
  68
  69 static WMHost*
  70 getHostWithHostEntry(struct hostent *host, char *name)
  71 {
  72     WMHost *hPtr;
  73     struct in_addr in;
  74     int i;
  75
  76     hPtr = (WMHost*)wmalloc(sizeof(WMHost));
  77     memset(hPtr, 0, sizeof(WMHost));
  78
  79     hPtr->names = WMCreateArrayWithDestructor(1, wfree);
  80     hPtr->addresses = WMCreateArrayWithDestructor(1, wfree);
  81
  82     WMAddToArray(hPtr->names, wstrdup(host->h_name));
  83
  84     for (i=0; host->h_aliases[i]!=NULL; i++) {
  85         WMAddToArray(hPtr->names, wstrdup(host->h_aliases[i]));
  86     }
  87
  88     for (i=0; host->h_addr_list[i]!=NULL; i++) {
  89         memcpy((void*)&in.s_addr, (const void*)host->h_addr_list[i],
  90                host->h_length);
  91         WMAddToArray(hPtr->addresses, wstrdup(inet_ntoa(in)));
  92     }
  93
  94     hPtr->refCount = 1;
  95
  96     if (hostCacheEnabled) {
  97         if (!hostCache)
  98             hostCache = WMCreateHashTable(WMStringPointerHashCallbacks);
  99         hPtr->name = wstrdup(name);
 100         wassertr(WMHashInsert(hostCache, hPtr->name, hPtr)==NULL);
 101         hPtr->refCount++;
 102     }
 103
 104     return hPtr;
 105 }
 106
 107
 108 WMHost*
 109 WMGetCurrentHost()
 110 {
 111     char name[W_MAXHOSTNAMELEN+1];
 112
 113     if (gethostname(name, W_MAXHOSTNAMELEN) < 0) {
 114         wsyserror(_("Cannot get current host name"));
 115         return NULL;
 116     }
 117
 118     name[W_MAXHOSTNAMELEN] = 0;
 119
 120     return WMGetHostWithName(name);
 121 }
 122
 123
 124 WMHost*
 125 WMGetHostWithName(char *name)
 126 {
 127     struct hostent *host;
 128     WMHost *hPtr;
 129
 130     wassertrv(name!=NULL, NULL);
 131
 132     if (hostCacheEnabled) {
 133         if ((hPtr = getHostFromCache(name)) != NULL) {
 134             WMRetainHost(hPtr);
 135             return hPtr;
 136         }
 137     }
 138
 139     host = gethostbyname(name);
 140     if (host == NULL) {
 141         return NULL;
 142     }
 143
 144     hPtr = getHostWithHostEntry(host, name);
 145
 146     return hPtr;
 147 }
 148
 149
 150 WMHost*
 151 WMGetHostWithAddress(char *address)
 152 {
 153     struct hostent *host;
 154     struct in_addr in;
 155     WMHost *hPtr;
 156
 157     wassertrv(address!=NULL, NULL);
 158
 159     if (hostCacheEnabled) {
 160         if ((hPtr = getHostFromCache(address)) != NULL) {
 161             WMRetainHost(hPtr);
 162             return hPtr;
 163         }
 164     }
 165
 166 #ifndef HAVE_INET_ATON
 167     if ((in.s_addr = inet_addr(address)) == INADDR_NONE)
 168         return NULL;
 169 #else
 170     if (inet_aton(address, &in) == 0)
 171         return NULL;
 172 #endif
 173
 174     host = gethostbyaddr((char*)&in, sizeof(in), AF_INET);
 175     if (host == NULL) {
 176         return NULL;
 177     }
 178
 179     hPtr = getHostWithHostEntry(host, address);
 180
 181     return hPtr;
 182 }
 183
 184
 185 WMHost*
 186 WMRetainHost(WMHost *hPtr)
 187 {
 188     hPtr->refCount++;
 189     return hPtr;
 190 }
 191
 192
 193 void
 194 WMReleaseHost(WMHost *hPtr)
 195 {
 196     hPtr->refCount--;
 197
 198     if (hPtr->refCount > 0)
 199         return;
 200
 201     WMFreeArray(hPtr->names);
 202     WMFreeArray(hPtr->addresses);
 203
 204     if (hPtr->name) {
 205         WMHashRemove(hostCache, hPtr->name);
 206         wfree(hPtr->name);
 207     }
 208
 209     wfree(hPtr);
 210 }
 211
 212
 213 void
 214 WMSetHostCacheEnabled(Bool flag)
 215 {
 216     hostCacheEnabled = ((flag==0) ? 0 : 1);
 217 }
 218
 219
 220 Bool
 221 WMIsHostCacheEnabled()
 222 {
 223     return hostCacheEnabled;
 224 }
 225
 226
 227 void
 228 WMFlushHostCache()
 229 {
 230     if (hostCache && WMCountHashTable(hostCache)>0) {
 231         WMArray *hostArray = WMCreateArray(WMCountHashTable(hostCache));
 232         WMHashEnumerator enumer = WMEnumerateHashTable(hostCache);
 233         WMHost *hPtr;
 234         int i;
 235
 236         while ((hPtr = WMNextHashEnumeratorItem(&enumer))) {
 237             /* we can't release the host here, because we can't change the
 238              * hash while using the enumerator functions. */
 239             WMAddToArray(hostArray, hPtr);
 240         }
 241         for (i=0; i<WMGetArrayItemCount(hostArray); i++)
 242             WMReleaseHost(WMGetFromArray(hostArray, i));
 243         WMFreeArray(hostArray);
 244         WMResetHashTable(hostCache);
 245     }
 246 }
 247
 248
 249 static int
 250 matchAddress(void *item, void *cdata)
 251 {
 252     return (strcmp((char*) item, (char*) cdata)==0);
 253 }
 254
 255
 256 Bool
 257 WMIsHostEqualToHost(WMHost* hPtr, WMHost* aPtr)
 258 {
 259     char *adr;
 260     int i;
 261
 262     wassertrv(hPtr!=NULL && aPtr!=NULL, False);
 263
 264     if (hPtr == aPtr)
 265         return True;
 266
 267     for (i=0; i<WMGetArrayItemCount(aPtr->addresses); i++) {
 268         adr = WMGetFromArray(aPtr->addresses, i);
 269         if (WMFindInArray(hPtr->addresses, matchAddress, adr) != WANotFound) {
 270             return True;
 271         }
 272     }
 273
 274     return False;
 275 }
 276
 277
 278 char*
 279 WMGetHostName(WMHost *hPtr)
 280 {
 281     return (WMGetArrayItemCount(hPtr->names) > 0 ?
 282             WMGetFromArray(hPtr->names, 0) : NULL);
 283     /*return WMGetFromArray(hPtr->names, 0);*/
 284 }
 285
 286
 287 WMArray*
 288 WMGetHostNames(WMHost *hPtr)
 289 {
 290     return hPtr->names;
 291 }
 292
 293
 294 char*
 295 WMGetHostAddress(WMHost *hPtr)
 296 {
 297     return (WMGetArrayItemCount(hPtr->addresses) > 0 ?
 298             WMGetFromArray(hPtr->addresses, 0) : NULL);
 299 }
 300
 301
 302 WMArray*
 303 WMGetHostAddresses(WMHost *hPtr)
 304 {
 305     return hPtr->addresses;
 306 }
 307
 308
 309
 310