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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/global/quote_821_local.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/global/quote_821_local.c')
-rw-r--r--src/global/quote_821_local.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/src/global/quote_821_local.c b/src/global/quote_821_local.c
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+/*++
+/* NAME
+/* quote_821_local 3
+/* SUMMARY
+/* quote local part of address
+/* SYNOPSIS
+/* #include "quote_821_local.h"
+/*
+/* VSTRING *quote_821_local(dst, src)
+/* VSTRING *dst;
+/* char *src;
+/*
+/* VSTRING *quote_821_local_flags(dst, src, flags)
+/* VSTRING *dst;
+/* const char *src;
+/* int flags;
+/* DESCRIPTION
+/* quote_821_local() quotes the local part of a mailbox address and
+/* returns a result that can be used in SMTP commands as specified
+/* by RFC 821. It implements an 8-bit clean version of RFC 821.
+/*
+/* quote_821_local_flags() provides finer control.
+/*
+/* Arguments:
+/* .IP dst
+/* The result.
+/* .IP src
+/* The input address.
+/* .IP flags
+/* Bit-wise OR of zero or more of the following.
+/* .RS
+/* .IP QUOTE_FLAG_8BITCLEAN
+/* In violation with RFCs, treat 8-bit text as ordinary text.
+/* .IP QUOTE_FLAG_EXPOSE_AT
+/* In violation with RFCs, treat `@' as an ordinary character.
+/* .IP QUOTE_FLAG_APPEND
+/* Append to the result buffer, instead of overwriting it.
+/* .RE
+/* STANDARDS
+/* RFC 821 (SMTP protocol)
+/* BUGS
+/* The code assumes that the domain is RFC 821 clean.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include <vstring.h>
+
+/* Global library. */
+
+#include "quote_821_local.h"
+
+/* Application-specific. */
+
+#define YES 1
+#define NO 0
+
+/* is_821_dot_string - is this local-part an rfc 821 dot-string? */
+
+static int is_821_dot_string(const char *local_part, const char *end, int flags)
+{
+ const char *cp;
+ int ch;
+
+ /*
+ * Detect any deviations from the definition of dot-string. We could use
+ * lookup tables to speed up some of the work, but hey, how large can a
+ * local-part be anyway?
+ */
+ if (local_part == end || local_part[0] == 0 || local_part[0] == '.')
+ return (NO);
+ for (cp = local_part; cp < end && (ch = *(unsigned char *) cp) != 0; cp++) {
+ if (ch == '.' && cp[1] == '.')
+ return (NO);
+ if (ch > 127 && !(flags & QUOTE_FLAG_8BITCLEAN))
+ return (NO);
+ if (ch == ' ')
+ return (NO);
+ if (ISCNTRL(ch))
+ return (NO);
+ if (ch == '<' || ch == '>'
+ || ch == '(' || ch == ')'
+ || ch == '[' || ch == ']'
+ || ch == '\\' || ch == ','
+ || ch == ';' || ch == ':'
+ || (ch == '@' && !(flags & QUOTE_FLAG_EXPOSE_AT)) || ch == '"')
+ return (NO);
+ }
+ if (cp[-1] == '.')
+ return (NO);
+ return (YES);
+}
+
+/* make_821_quoted_string - make quoted-string from local-part */
+
+static VSTRING *make_821_quoted_string(VSTRING *dst, const char *local_part,
+ const char *end, int flags)
+{
+ const char *cp;
+ int ch;
+
+ /*
+ * Put quotes around the result, and prepend a backslash to characters
+ * that need quoting when they occur in a quoted-string.
+ */
+ VSTRING_ADDCH(dst, '"');
+ for (cp = local_part; cp < end && (ch = *(unsigned char *) cp) != 0; cp++) {
+ if ((ch > 127 && !(flags & QUOTE_FLAG_8BITCLEAN))
+ || ch == '\r' || ch == '\n' || ch == '"' || ch == '\\')
+ VSTRING_ADDCH(dst, '\\');
+ VSTRING_ADDCH(dst, ch);
+ }
+ VSTRING_ADDCH(dst, '"');
+ VSTRING_TERMINATE(dst);
+ return (dst);
+}
+
+/* quote_821_local_flags - quote local part of address according to rfc 821 */
+
+VSTRING *quote_821_local_flags(VSTRING *dst, const char *addr, int flags)
+{
+ const char *at;
+
+ /*
+ * According to RFC 821, a local-part is a dot-string or a quoted-string.
+ * We first see if the local-part is a dot-string. If it is not, we turn
+ * it into a quoted-string. Anything else would be too painful.
+ */
+ if ((at = strrchr(addr, '@')) == 0) /* just in case */
+ at = addr + strlen(addr); /* should not happen */
+ if ((flags & QUOTE_FLAG_APPEND) == 0)
+ VSTRING_RESET(dst);
+ if (is_821_dot_string(addr, at, flags)) {
+ return (vstring_strcat(dst, addr));
+ } else {
+ make_821_quoted_string(dst, addr, at, flags & QUOTE_FLAG_8BITCLEAN);
+ return (vstring_strcat(dst, at));
+ }
+}
+
+#ifdef TEST
+
+ /*
+ * Test program for local-part quoting as per rfc 821
+ */
+#include <stdlib.h>
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include "quote_821_local.h"
+
+int main(void)
+{
+ VSTRING *src = vstring_alloc(100);
+ VSTRING *dst = vstring_alloc(100);
+
+ while (vstring_fgets_nonl(src, VSTREAM_IN)) {
+ vstream_fprintf(VSTREAM_OUT, "%s\n",
+ vstring_str(quote_821_local(dst, vstring_str(src))));
+ vstream_fflush(VSTREAM_OUT);
+ }
+ exit(0);
+}
+
+#endif