mdw@git.distorted.org.uk Git - ezmlm/blob - sub_std/checktag.c

   1 /*$Id: checktag.c,v 1.4 1999/10/12 23:38:36 lindberg Exp $*/
   2 /*$Name: ezmlm-idx-040 $*/
   3 #include "stralloc.h"
   4 #include "scan.h"
   5 #include "fmt.h"
   6 #include "cookie.h"
   7 #include "makehash.h"
   8 #include "strerr.h"
   9 #include "errtxt.h"
  10 #include "subscribe.h"
  11
  12 static stralloc key = {0};
  13 static stralloc line = {0};
  14 static stralloc quoted = {0};
  15 static char strnum[FMT_ULONG];
  16 static char newcookie[COOKIE];
  17
  18 char *checktag (dir,num,listno,action,seed,hash)
  19 /* reads dir/sql. If not present, checks that the hash of seed matches */
  20 /* hash and returns success (NULL). If not match returns "". If error, */
  21 /* returns error string */
  22
  23 char *dir;                              /* the db base dir */
  24 unsigned long num;                      /* message number */
  25 unsigned long listno;                   /* bottom of range => slave */
  26 char *action;
  27 char *seed;                             /* cookie base */
  28 char *hash;                             /* cookie */
  29 {
  30
  31     if (!seed) return (char *) 0;               /* no data - accept */
  32
  33     strnum[fmt_ulong(strnum,num)] = '\0';       /* message nr ->string*/
  34
  35     switch(slurp("key",&key,32)) {
  36       case -1:
  37         return ERR_READ_KEY;
  38       case 0:
  39         return ERR_NOEXIST_KEY;
  40     }
  41
  42     cookie(newcookie,key.s,key.len,strnum,seed,action);
  43     if (byte_diff(hash,COOKIE,newcookie)) return "";
  44     else return (char *) 0;
  45
  46 }