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