WINGs/host.c

   1 /*
   2  *  WINGs WMHost function library
   3  *
   4  *  Copyright (c) 1999-2000 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 "../src/config.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     int i;
 197
 198     hPtr->refCount--;
 199
 200     if (hPtr->refCount > 0)
 201         return;
 202
 203     WMFreeArray(hPtr->names);
 204     WMFreeArray(hPtr->addresses);
 205
 206     if (hPtr->name) {
 207         WMHashRemove(hostCache, hPtr->name);
 208         wfree(hPtr->name);
 209     }
 210
 211     wfree(hPtr);
 212 }
 213
 214
 215 void
 216 WMSetHostCacheEnabled(Bool flag)
 217 {
 218     hostCacheEnabled = flag;
 219 }
 220
 221
 222 Bool
 223 WMIsHostCacheEnabled()
 224 {
 225     return hostCacheEnabled;
 226 }
 227
 228
 229 void
 230 WMFlushHostCache()
 231 {
 232     if (hostCache && WMCountHashTable(hostCache)>0) {
 233         WMArray *hostArray = WMCreateArray(WMCountHashTable(hostCache));
 234         WMHashEnumerator enumer = WMEnumerateHashTable(hostCache);
 235         WMHost *hPtr;
 236         int i;
 237
 238         while ((hPtr = WMNextHashEnumeratorItem(&enumer))) {
 239             /* we can't release the host here, because we can't change the
 240              * hash while using the enumerator functions. */
 241             WMAddToArray(hostArray, hPtr);
 242         }
 243         for (i=0; i<WMGetArrayItemCount(hostArray); i++)
 244             WMReleaseHost(WMGetFromArray(hostArray, i));
 245         WMFreeArray(hostArray);
 246         WMResetHashTable(hostCache);
 247     }
 248 }
 249
 250
 251 Bool
 252 WMIsHostEqualToHost(WMHost* hPtr, WMHost* aPtr)
 253 {
 254     int i, j;
 255     char *adr1, *adr2;
 256
 257     wassertrv(hPtr!=NULL && aPtr!=NULL, False);
 258
 259     if (hPtr == aPtr)
 260         return True;
 261
 262     for (i=0; i<WMGetArrayItemCount(aPtr->addresses); i++) {
 263         adr1 = WMGetFromArray(aPtr->addresses, i);
 264         // use WMFindInArray here --Dan
 265         for (j=0; j<WMGetArrayItemCount(hPtr->addresses); j++) {
 266             adr2 = WMGetFromArray(hPtr->addresses, j);
 267             if (strcmp(adr1, adr2)==0)
 268                 return True;
 269         }
 270     }
 271
 272     return False;
 273 }
 274
 275
 276 char*
 277 WMGetHostName(WMHost *hPtr)
 278 {
 279     return (WMGetArrayItemCount(hPtr->names) > 0 ?
 280             WMGetFromArray(hPtr->names, 0) : NULL);
 281     /*return WMGetFromArray(hPtr->names, 0);*/
 282 }
 283
 284
 285 WMArray*
 286 WMGetHostNames(WMHost *hPtr)
 287 {
 288     return hPtr->names;
 289 }
 290
 291
 292 char*
 293 WMGetHostAddress(WMHost *hPtr)
 294 {
 295     return (WMGetArrayItemCount(hPtr->addresses) > 0 ?
 296             WMGetFromArray(hPtr->addresses, 0) : NULL);
 297 }
 298
 299
 300 WMArray*
 301 WMGetHostAddresses(WMHost *hPtr)
 302 {
 303     return hPtr->addresses;
 304 }
 305
 306
 307
 308