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

   1 /*$Id: issub.c,v 1.4 1999/10/12 23:38:36 lindberg Exp $*/
   2 /*$Name: ezmlm-idx-040 $*/
   3 #include "stralloc.h"
   4 #include "getln.h"
   5 #include "readwrite.h"
   6 #include "substdio.h"
   7 #include "open.h"
   8 #include "byte.h"
   9 #include "case.h"
  10 #include "strerr.h"
  11 #include "error.h"
  12 #include "uint32.h"
  13 #include "fmt.h"
  14 #include "subscribe.h"
  15 #include "errtxt.h"
  16
  17 static void die_nomem(fatal)
  18 char *fatal;
  19 {
  20   strerr_die2x(111,fatal,ERR_NOMEM);
  21 }
  22
  23 static stralloc addr = {0};
  24 static stralloc lcaddr = {0};
  25 static stralloc line = {0};
  26 static stralloc quoted = {0};
  27 static stralloc fn = {0};
  28 static substdio ss;
  29 static char ssbuf[512];
  30 static char szh[FMT_ULONG];
  31
  32 char *issub(dbname,userhost,tab,fatal)
  33 /* Returns (char *) to match if userhost is in the subscriber database     */
  34 /* dbname, 0 otherwise. dbname is a base directory for a list and may NOT  */
  35 /* be NULL        */
  36 /* NOTE: The returned pointer is NOT VALID after a subsequent call to issub!*/
  37
  38 char *dbname;           /* directory to basedir */
  39 char *userhost;
  40 char *tab;              /* override table name */
  41 char *fatal;
  42
  43 {
  44
  45   int fd;
  46   unsigned int j;
  47   uint32 h,lch;
  48   char ch,lcch;
  49   int match;
  50
  51     if (!stralloc_copys(&addr,"T")) die_nomem(fatal);
  52     if (!stralloc_cats(&addr,userhost)) die_nomem(fatal);
  53
  54     j = byte_rchr(addr.s,addr.len,'@');
  55     if (j == addr.len) return (char *) 0;
  56     case_lowerb(addr.s + j + 1,addr.len - j - 1);
  57     if (!stralloc_copy(&lcaddr,&addr)) die_nomem(fatal);
  58     case_lowerb(lcaddr.s + 1,j - 1);    /* totally lc version of addr */
  59
  60     h = 5381;
  61     lch = h;                    /* make hash for both for backwards comp */
  62     for (j = 0;j < addr.len;++j) {      /* (lcaddr.len == addr.len) */
  63       h = (h + (h << 5)) ^ (uint32) (unsigned char) addr.s[j];
  64       lch = (lch + (lch << 5)) ^ (uint32) (unsigned char) lcaddr.s[j];
  65     }
  66     ch = 64 + (h % 53);
  67     lcch = 64 + (lch % 53);
  68
  69     if (!stralloc_0(&addr)) die_nomem(fatal);
  70     if (!stralloc_0(&lcaddr)) die_nomem(fatal);
  71     if (!stralloc_copys(&fn,dbname)) die_nomem(fatal);
  72     if (!stralloc_cats(&fn,"/subscribers/")) die_nomem(fatal);
  73     if (!stralloc_catb(&fn,&lcch,1)) die_nomem(fatal);
  74     if (!stralloc_0(&fn)) die_nomem(fatal);
  75
  76     fd = open_read(fn.s);
  77     if (fd == -1) {
  78       if (errno != error_noent)
  79         strerr_die4sys(111,fatal,ERR_OPEN,fn.s,": ");
  80     } else {
  81       substdio_fdbuf(&ss,read,fd,ssbuf,sizeof(ssbuf));
  82
  83       for (;;) {
  84         if (getln(&ss,&line,&match,'\0') == -1)
  85           strerr_die4sys(111,fatal,ERR_READ,fn.s,": ");
  86         if (!match) break;
  87         if (line.len == lcaddr.len)
  88           if (!case_diffb(line.s,line.len,lcaddr.s))
  89             { close(fd); return line.s+1; }
  90       }
  91
  92       close(fd);
  93     }
  94         /* here if file not found or (file found && addr not there) */
  95
  96     if (ch == lcch) return (char *) 0;
  97
  98         /* try case sensitive hash for backwards compatibility */
  99     fn.s[fn.len - 2] = ch;
 100     fd = open_read(fn.s);
 101     if (fd == -1) {
 102       if (errno != error_noent)
 103         strerr_die4sys(111,fatal,ERR_OPEN,fn.s,": ");
 104       return (char *) 0;
 105     }
 106     substdio_fdbuf(&ss,read,fd,ssbuf,sizeof(ssbuf));
 107
 108     for (;;) {
 109       if (getln(&ss,&line,&match,'\0') == -1)
 110         strerr_die4sys(111,fatal,ERR_READ,fn.s,": ");
 111       if (!match) break;
 112       if (line.len == addr.len)
 113         if (!case_diffb(line.s,line.len,addr.s))
 114           { close(fd); return line.s+1; }
 115     }
 116
 117     close(fd);
 118
 119     return (char *) 0;
 120 }