diplodocus.org Git - nmh/blob - mts/mmdf/hosts.c

   1
   2 /*
   3  * hosts.c -- use MMDF to get hostname information
   4  *
   5  * $Id$
   6  */
   7
   8 #include "../../h/strings.h"
   9 #include "util.h"
  10 #include "mmdf.h"
  11 #include "ch.h"
  12
  13 #ifdef MMDFII
  14 # include "dm.h"
  15 #endif /* MMDFII */
  16
  17 #include "../../zotnet/mts.h"
  18
  19 /*
  20  * We really should be careful with the number of fd's that this routine
  21  * opens:  the ch_seq ch_table.c module likes to keep 6 (yes, SIX) fds around
  22  * to speed-up host lookups in the channel table.  Unfortunately, after all
  23  * of them get opened, six are always open (ch_table may close one to open
  24  * another).  The bottom line is that if repl calls post, then we get 12
  25  * (yes, TWELVE) fds open, with only six usable.
  26  *
  27  * send will close all fds >= 3 prior to invoking post.  It would be nice
  28  * if one could control ch_seq's use of fds for table lookups, but such is
  29  * life.
  30  *
  31  */
  32
  33 #ifndef MMDFII
  34 char *
  35 OfficialName (char *name)
  36 {
  37     register Chan *ch;
  38     static char buffer[BUFSIZ];
  39
  40     return ((ch = ch_h2chan (name, buffer)) == (Chan *) (-1) ? NULL
  41             : ch == (Chan *) NULL ? LocalName ()
  42             : buffer);
  43 }
  44 #else   /* MMDFII */
  45
  46 extern char *invo_name;
  47
  48 extern short ch_yloc;            /* ok to intercept local names */
  49
  50 static int inited = 0;
  51
  52 char *
  53 OfficialName (char *name)
  54 {
  55     Dmn_route route;
  56     static char buffer[BUFSIZ];
  57
  58     if (!inited) {
  59         mmdf_init (invo_name);
  60         inited = 1;
  61     }
  62     switch (dm_v2route (name, buffer, &route)) {
  63         case NOTOK:
  64         case OK:
  65             return ((ch_yloc && lexequ (name, LocalName ())) ? LocalName ()
  66                     : NULL);
  67
  68         default:
  69             return buffer;
  70     }
  71 }
  72 #endif  /* MMDFII */