external/ibm-public/postfix/dist/src/global/split_addr.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      split_addr 3
   6 /* SUMMARY
   7 /*      recipient localpart address splitter
   8 /* SYNOPSIS
   9 /*      #include <split_addr.h>
  10 /*
  11 /*      char    *split_addr(localpart, delimiter)
  12 /*      char    *localpart;
  13 /*      int     delimiter;
  14 /* DESCRIPTION
  15 /*      split_addr() null-terminates \fIlocalpart\fR at the first
  16 /*      occurrence of the \fIdelimiter\fR character found, and
  17 /*      returns a pointer to the remainder.
  18 /*
  19 /*      Reserved addresses are not split: postmaster, mailer-daemon,
  20 /*      double-bounce. Addresses that begin with owner-, or addresses
  21 /*      that end in -request are not split when the owner_request_special
  22 /*      parameter is set.
  23 /* LICENSE
  24 /* .ad
  25 /* .fi
  26 /*      The Secure Mailer license must be distributed with this software.
  27 /* AUTHOR(S)
  28 /*      Wietse Venema
  29 /*      IBM T.J. Watson Research
  30 /*      P.O. Box 704
  31 /*      Yorktown Heights, NY 10598, USA
  32 /*--*/
  33
  34 /* System library. */
  35
  36 #include <sys_defs.h>
  37 #include <string.h>
  38
  39 #ifdef STRCASECMP_IN_STRINGS_H
  40 #include <strings.h>
  41 #endif
  42
  43 /* Utility library. */
  44
  45 #include <split_at.h>
  46
  47 /* Global library. */
  48
  49 #include <mail_params.h>
  50 #include <mail_addr.h>
  51 #include <split_addr.h>
  52
  53 /* split_addr - split address with extreme prejudice */
  54
  55 char   *split_addr(char *localpart, int delimiter)
  56 {
  57     int     len;
  58
  59     /*
  60      * Don't split these, regardless of what the delimiter is.
  61      */
  62     if (strcasecmp(localpart, MAIL_ADDR_POSTMASTER) == 0)
  63         return (0);
  64     if (strcasecmp(localpart, MAIL_ADDR_MAIL_DAEMON) == 0)
  65         return (0);
  66     if (strcasecmp(localpart, var_double_bounce_sender) == 0)
  67         return (0);
  68
  69     /*
  70      * Backwards compatibility: don't split owner-foo or foo-request.
  71      */
  72     if (delimiter == '-' && var_ownreq_special != 0) {
  73         if (strncasecmp(localpart, "owner-", 6) == 0)
  74             return (0);
  75         if ((len = strlen(localpart) - 8) > 0
  76             && strcasecmp(localpart + len, "-request") == 0)
  77             return (0);
  78     }
  79
  80     /*
  81      * Safe to split this address. Do not split the address if the result
  82      * would have a null localpart.
  83      */
  84     return (delimiter == *localpart ? 0 : split_at(localpart, delimiter));
  85 }