160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
/*++
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/* NAME
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/* quote_821_local 3
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/* SUMMARY
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/* quote local part of address
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/* SYNOPSIS
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/* #include "quote_821_local.h"
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/*
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/* VSTRING *quote_821_local(dst, src)
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/* VSTRING *dst;
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/* char *src;
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/* DESCRIPTION
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/* quote_821_local() quotes the local part of a mailbox address and
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/* returns a result that can be used in SMTP commands as specified
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/* by RFC 821.
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/*
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/* Arguments:
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/* .IP dst
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/* The result.
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/* .IP src
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/* The input address.
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/* STANDARDS
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/* RFC 821 (SMTP protocol)
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/* BUGS
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/* The code assumes that the domain is RFC 821 clean.
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include <sys_defs.h>
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#include <string.h>
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#include <ctype.h>
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/* Utility library. */
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#include <vstring.h>
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/* Global library. */
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#include "quote_821_local.h"
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/* Application-specific. */
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#define YES 1
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#define NO 0
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/* is_821_dot_string - is this local-part an rfc 821 dot-string? */
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static int is_821_dot_string(char *local_part, char *end)
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{
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char *cp;
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int ch;
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/*
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* Detect any deviations from the definition of dot-string. We could use
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* lookup tables to speed up some of the work, but hey, how large can a
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* local-part be anyway?
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*/
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if (local_part[0] == 0 || local_part[0] == '.')
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return (NO);
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for (cp = local_part; cp < end && (ch = *cp) != 0; cp++) {
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if (ch == '.' && cp[1] == '.')
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return (NO);
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if (ch > 127)
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return (NO);
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if (ch == ' ')
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return (NO);
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if (ISCNTRL(ch))
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return (NO);
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if (ch == '<' || ch == '>'
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|| ch == '(' || ch == ')'
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|| ch == '[' || ch == ']'
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|| ch == '\\' || ch == ','
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|| ch == ';' || ch == ':'
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/* || ch == '@' */ || ch == '"')
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return (NO);
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}
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if (cp[-1] == '.')
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return (NO);
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return (YES);
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}
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/* make_821_quoted_string - make quoted-string from local-part */
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static VSTRING *make_821_quoted_string(VSTRING *dst, char *local_part, char *end)
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{
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char *cp;
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int ch;
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/*
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* Put quotes around the result, and prepend a backslash to characters
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* that need quoting when they occur in a quoted-string.
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*/
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VSTRING_RESET(dst);
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VSTRING_ADDCH(dst, '"');
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for (cp = local_part; cp < end && (ch = *cp) != 0; cp++) {
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if (ch > 127 || ch == '\r' || ch == '\n' || ch == '"' || ch == '\\')
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VSTRING_ADDCH(dst, '\\');
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VSTRING_ADDCH(dst, ch);
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}
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VSTRING_ADDCH(dst, '"');
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VSTRING_TERMINATE(dst);
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return (dst);
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}
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/* quote_821_local - quote local part of address according to rfc 821 */
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VSTRING *quote_821_local(VSTRING *dst, char *addr)
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{
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char *at;
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/*
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* According to RFC 821, a local-part is a dot-string or a quoted-string.
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* We first see if the local-part is a dot-string. If it is not, we turn
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* it into a quoted-string. Anything else would be too painful.
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*/
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if ((at = strrchr(addr, '@')) == 0) /* just in case */
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at = addr + strlen(addr); /* should not happen */
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if (is_821_dot_string(addr, at)) {
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return (vstring_strcpy(dst, addr));
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} else {
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make_821_quoted_string(dst, addr, at);
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return (vstring_strcat(dst, at));
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}
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}
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#ifdef TEST
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/*
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* Test program for local-part quoting as per rfc 821
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*/
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#include <stdlib.h>
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#include <vstream.h>
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#include <vstring_vstream.h>
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#include "quote_821_local.h"
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main(void)
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{
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VSTRING *src = vstring_alloc(100);
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VSTRING *dst = vstring_alloc(100);
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while (vstring_fgets_nonl(src, VSTREAM_IN)) {
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vstream_fprintf(VSTREAM_OUT, "%s\n",
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vstring_str(quote_821_local(dst, vstring_str(src))));
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vstream_fflush(VSTREAM_OUT);
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}
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exit(0);
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}
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#endif
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