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

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      verp_sender 3
   6 /* SUMMARY
   7 /*      quote local part of mailbox
   8 /* SYNOPSIS
   9 /*      #include <verp_sender.h>
  10 /*
  11 /*      VSTRING *verp_sender(dst, delims, sender, recipient)
  12 /*      VSTRING *dst;
  13 /*      const char *delims;
  14 /*      const char *sender;
  15 /*      const RECIPIENT *recipient;
  16 /*
  17 /*      const char *verp_delims_verify(delims)
  18 /*      const char *delims;
  19 /* DESCRIPTION
  20 /*      verp_sender() encodes the recipient address in the sender
  21 /*      address, using the specified delimiters. For example,
  22 /*      with delims +=, sender \fIprefix@origin\fR, and
  23 /*      recipient \fIuser@domain\fR the result is
  24 /*      \fIprefix+user=domain@origin\fR.
  25 /*
  26 /*      verp_delims_verify() determines if the specified VERP delimiters
  27 /*      have reasonable values. What is reasonable is configured with
  28 /*      the verp_delimiter_filter configuration parameter. The result
  29 /*      is null in case of success, a description of the problem in
  30 /*      case of error.
  31 /*
  32 /*      Arguments:
  33 /* .IP dst
  34 /*      The result. The buffer is null terminated.
  35 /* .IP delims
  36 /*      VERP formatting characters.
  37 /* .IP sender
  38 /*      Sender envelope address.
  39 /* .IP recipient
  40 /*      Recipient envelope address.
  41 /* LICENSE
  42 /* .ad
  43 /* .fi
  44 /*      The Secure Mailer license must be distributed with this software.
  45 /* AUTHOR(S)
  46 /*      Wietse Venema
  47 /*      IBM T.J. Watson Research
  48 /*      P.O. Box 704
  49 /*      Yorktown Heights, NY 10598, USA
  50 /*--*/
  51
  52 /* System library. */
  53
  54 #include <sys_defs.h>
  55 #include <string.h>
  56
  57 /* Utility library. */
  58
  59 #include <vstring.h>
  60
  61 /* Global library. */
  62
  63 #include <mail_params.h>
  64 #include <recipient_list.h>
  65 #include <verp_sender.h>
  66
  67 /* verp_sender - encode recipient into envelope sender address */
  68
  69 VSTRING *verp_sender(VSTRING *buf, const char *delimiters,
  70                              const char *sender, const RECIPIENT *rcpt_info)
  71 {
  72     ssize_t send_local_len;
  73     ssize_t rcpt_local_len;
  74     const char *recipient;
  75     const char *cp;
  76
  77     /*
  78      * Change prefix@origin into prefix+user=domain@origin.
  79      *
  80      * Fix 20090115: Use the Postfix original recipient, because that is what
  81      * the VERP consumer expects.
  82      */
  83     send_local_len = ((cp = strrchr(sender, '@')) != 0 ?
  84                       cp - sender : strlen(sender));
  85     recipient = (rcpt_info->orig_addr[0] ?
  86                  rcpt_info->orig_addr : rcpt_info->address);
  87     rcpt_local_len = ((cp = strrchr(recipient, '@')) != 0 ?
  88                       cp - recipient : strlen(recipient));
  89     vstring_strncpy(buf, sender, send_local_len);
  90     VSTRING_ADDCH(buf, delimiters[0] & 0xff);
  91     vstring_strncat(buf, recipient, rcpt_local_len);
  92     if (recipient[rcpt_local_len] && recipient[rcpt_local_len + 1]) {
  93         VSTRING_ADDCH(buf, delimiters[1] & 0xff);
  94         vstring_strcat(buf, recipient + rcpt_local_len + 1);
  95     }
  96     if (sender[send_local_len] && sender[send_local_len + 1]) {
  97         VSTRING_ADDCH(buf, '@');
  98         vstring_strcat(buf, sender + send_local_len + 1);
  99     }
 100     VSTRING_TERMINATE(buf);
 101     return (buf);
 102 }
 103
 104 /* verp_delims_verify - sanitize VERP delimiters */
 105
 106 const char *verp_delims_verify(const char *delims)
 107 {
 108     if (strlen(delims) != 2)
 109         return ("bad VERP delimiter character count");
 110     if (strchr(var_verp_filter, delims[0]) == 0)
 111         return ("bad first VERP delimiter character");
 112     if (strchr(var_verp_filter, delims[1]) == 0)
 113         return ("bad second VERP delimiter character");
 114     return (0);
 115 }