Initial revision

server/host.c

@@ -0,0 +1,144 @@
+    /*********************************************************************\
+    *  Copyright (c) 1991 by Wen-King Su (wen-king@vlsi.cs.caltech.edu)   *
+    *                                                                     *
+    *  You may copy or modify this file in any manner you wish, provided  *
+    *  that this notice is always included, and that you hold the author  *
+    *  harmless for any loss or damage resulting from the installation or *
+    *  use of this software.                                              *
+    \*********************************************************************/
+
+#include "tweak.h"
+#include "server_def.h"
+#include "s_extern.h"
+#include <ctype.h>
+#include <netdb.h>
+#ifdef STDC_HEADERS
+#include <stdlib.h>
+#endif
+#include "my-string.h"
+
+/****************************************************************************
+* This file contains routines to maintain client database.
+****************************************************************************/
+
+static HTAB     *htab;		/* client data base.			*/
+static unsigned  hcnt;		/* number of clients.			*/
+static unsigned  htot = 0;	/* available entries in the data base.	*/
+static HTAB     hzero;
+
+#define HALLOC_SIZE 30
+
+/****************************************************************************
+ * Look up the hostname for an inet number.  Return NULL if not found.
+ ****************************************************************************/
+
+static char *find_hostname PROTO1(unsigned long, inet_num)
+{
+  struct hostent *he;
+  char *hostname;
+  
+  if ((he = gethostbyaddr((char*)&inet_num, sizeof(inet_num), AF_INET))) {
+    hostname = malloc(strlen(he->h_name)+1);
+    strcpy(hostname, he->h_name);
+  } else
+    hostname = 0;
+  
+  return hostname;
+}
+
+/****************************************************************************
+ * Returns an entry from the database corresponding to to the inet number.
+ * A new entry is created is it is not found.
+ * The database is a linear array of sorted structures.
+ * Entries are searched using binary search on the array.
+ ****************************************************************************/
+
+HTAB *find_host PROTO1(unsigned long, inet_num)
+{
+  unsigned l, h, m, i;
+  unsigned long inum;
+  HTAB *hs, *hd;
+  
+  for(l = 0, h = hcnt-1; (m = (l + h) >> 1) != l; ) {	/* binary search */
+    inum = htab[m].inet_num;
+    if(inum > inet_num) h = m;
+    else if(inum < inet_num) l = m;
+    else {
+      /* if we *need* reverse naming and we haven't already got one
+	 then try looking it up again. */
+      if (no_unnamed && !htab[m].hostname)
+	htab[m].hostname = find_hostname(inum);
+      htab[m].acc_cnt++;
+      return(htab+m);
+    }
+  }
+  
+  if(htab[m].inet_num < inet_num) m++;  /* locate first entry that is > */
+  
+  if((hcnt+1) > htot) { /* need more space */
+    htot += HALLOC_SIZE;		/* add HALLOC_SIZE entries at a time */
+    
+    if(!(htab = (HTAB *) realloc(htab,sizeof(HTAB)*htot))) {
+      perror("grow_htab realloc");
+      exit(5);
+    }
+  }
+  
+  for(i = hcnt-m, hs = htab+hcnt, hd=htab+hcnt+1; i--; *--hd = *--hs);
+  
+  htab[m]=hzero;
+  htab[m].inet_num = inet_num;
+  htab[m].hostname = find_hostname(inet_num);
+  hcnt++;
+  return(htab+m);
+}
+
+/****************************************************************************
+ * Client database initialization routine.
+ ****************************************************************************/
+
+int init_htab PROTO0((void)) /* always have 2 entries -- 0, MAXINT */
+{
+  if(!(htab = (HTAB *) malloc(sizeof(HTAB)*HALLOC_SIZE))) {
+    perror("grow_htab malloc");
+    exit(5);
+  }
+  htab[0] = hzero;
+  htab[1] = hzero;
+  htab[1].inet_num = ~0U;
+  hcnt = 2;
+  htot = HALLOC_SIZE;
+  return(0);
+}
+
+/****************************************************************************
+ * Write out the client table in the .HTAB_DUMP file.
+ ****************************************************************************/
+
+int dump_htab PROTO1(FILE *,fp)
+{
+  int i;
+  HTAB *hp;
+  
+  if( fp == NULL)
+  {
+      if(dbug) 
+	  fp=stdout;
+      else
+	  return(0);
+  }
+
+  fprintf(fp,"#FSP Server "PACKAGE_VERSION", dumping at %s\nHost table content:\n",ctime(&cur_time));
+  
+  fprintf(fp,"#IP address\tcount  last access date\n");
+  for(i = hcnt-2, hp = htab+1; i--; hp++) {
+    fprintf(fp,"%d.%d.%d.%d\t%5d  %s", ((unsigned char *)(&hp->inet_num))[0],
+	    ((unsigned char *)(&hp->inet_num))[1],
+	    ((unsigned char *)(&hp->inet_num))[2],
+	    ((unsigned char *)(&hp->inet_num))[3],
+	    hp->acc_cnt,
+	    ctime((time_t *) &(hp->last_acc)));
+  }
+  fprintf(fp,"\n#END\n");
+  return(0);
+}