* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2016 */
+/* Copyright (c) The Exim Maintainers 2021 - 2022 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Source files for exim all #include this header, which drags in everything
# include <limits.h>
#endif
+#ifdef EXIM_HAVE_INOTIFY
+# include <sys/inotify.h>
+#endif
+#ifdef EXIM_HAVE_KEVENT
+# include <sys/event.h>
+#endif
+
/* C99 integer types, figure out how to undo this if needed for older systems */
#include <inttypes.h>
# endif
#endif
+/* RFC 5321 specifies that the maximum length of a local-part is 64 octets
+and the maximum length of a domain is 255 octets, but then also defines
+the maximum length of a forward/reverse path as 256 not 64+1+255.
+For an IP address, the maximum is 45 without a scope and we don't work
+with scoped addresses, so go with that. (IPv6 with mapped IPv4).
+
+A hostname maximum length is in practice the same as the domainname, for
+the same core reasons (maximum length of a DNS name), but the semantics
+are different and seeing "DOMAIN" in source is confusing when talking about
+hostnames; so we define a second macro. We'll use RFC 2181 as the reference
+for this one.
+
+There is no known (to me) specification on the maximum length of a human name
+in email addresses and we should be careful about imposing such a limit on
+received email, but in terms of limiting what untrusted callers specify, or
+local generation, having a limit makes sense. Err on the side of generosity.
+
+For a display mail address, we have a human name, an email in brackets,
+possibly some (Comments), so it needs to be at least 512+3 and some more to
+avoid extraneous errors.
+Since the sane SMTP line length limit is 998, constraining such parameters to
+be 1024 seems generous and unlikely to spuriously reject legitimate
+invocations.
+
+The driver name is a name of a router/transport/authenticator etc in the
+configuration file. We also use this for some other short strings, such
+as queue names.
+Also TLS ciphersuite name (no real known limit since the protocols use
+integers, but max seen in reality is 45 octets).
+
+RFC 1413 gives us the 512 limit on IDENT protocol userids.
+*/
+
+#define EXIM_EMAILADDR_MAX 256
+#define EXIM_LOCALPART_MAX 64
+#define EXIM_DOMAINNAME_MAX 255
+#define EXIM_IPADDR_MAX 45
+#define EXIM_HOSTNAME_MAX 255
+#define EXIM_HUMANNAME_MAX 256
+#define EXIM_DISPLAYMAIL_MAX 1024
+#define EXIM_DRIVERNAME_MAX 64
+#define EXIM_CIPHERNAME_MAX 64
+#define EXIM_IDENTUSER_MAX 512
+
+
#include <sys/types.h>
#include <sys/file.h>
#include <dirent.h>
#include <arpa/nameser.h>
-/* If arpa/nameser.h defines a maximum name server packet size, use it,
-provided it is greater than 2048. Otherwise go for a default. PACKETSZ was used
-for this, but it seems that NS_PACKETSZ is coming into use. */
-
-#if defined(NS_PACKETSZ) && NS_PACKETSZ >= 2048
- #define MAXPACKET NS_PACKETSZ
-#elif defined(PACKETSZ) && PACKETSZ >= 2048
- #define MAXPACKET PACKETSZ
-#else
- #define MAXPACKET 2048
-#endif
-
/* While IPv6 is still young the definitions of T_AAAA and T_A6 may not be
included in arpa/nameser.h. Fudge them here. */
/* The header from the PCRE regex package */
-#include <pcre.h>
+#define PCRE2_CODE_UNIT_WIDTH 8
+#include <pcre2.h>
/* Exim includes are in several files. Note that local_scan.h #includes
config.h, mytypes.h, and store.h, so we don't need to mention them explicitly.
#include "local_scan.h"
#include "macros.h"
-#include "dbstuff.h"
+#include "hintsdb.h"
+#include "hintsdb_structs.h"
#include "structs.h"
#include "blob.h"
-#include "globals.h"
#include "hash.h"
+#include "globals.h"
#include "functions.h"
#include "dbfunctions.h"
#include "osfunctions.h"
#ifdef EXPERIMENTAL_BRIGHTMAIL
# include "bmi_spam.h"
#endif
-#ifdef EXPERIMENTAL_SPF
+#ifdef SUPPORT_SPF
# include "spf.h"
#endif
-#ifdef EXPERIMENTAL_SRS
-# include "srs.h"
-#endif
#ifndef DISABLE_DKIM
# include "dkim.h"
#endif
-#ifdef EXPERIMENTAL_DMARC
+#ifdef SUPPORT_DMARC
# include "dmarc.h"
# include <opendmarc/dmarc.h>
#endif
struct sockaddr v0;
};
-/* If SUPPORT_TLS is not defined, ensure that USE_GNUTLS is also not defined
-so that if USE_GNUTLS *is* set, we can assume SUPPORT_TLS is also set.
+/* If DISABLE_TLS is defined, ensure that USE_GNUTLS is not defined
+so that if USE_GNUTLS *is* set, we can assume DISABLE_TLS is not set.
+Ditto USE_OPENSSL.
Likewise, OSCP, AUTH_TLS and CERTNAMES cannot be supported. */
-#ifndef SUPPORT_TLS
+#ifdef DISABLE_TLS
+# undef USE_OPENSSL
# undef USE_GNUTLS
# ifndef DISABLE_OCSP
# define DISABLE_OCSP
#endif
/* DANE w/o DNSSEC is useless */
-#if defined(EXPERIMENTAL_DANE) && defined(DISABLE_DNSSEC)
-# undef DISABLE_DNSSEC
+#if defined(SUPPORT_DANE) && defined(DISABLE_DNSSEC)
+# error DANE support requires DNSSEC support
+#endif
+
+/* Some platforms (FreeBSD, OpenBSD, Solaris) do not seem to define this */
+
+#ifndef POLLRDHUP
+# define POLLRDHUP (POLLIN | POLLHUP)
+#endif
+
+/* Some platforms (Darwin) have to define a larger limit on groups membership */
+
+#ifndef EXIM_GROUPLIST_SIZE
+# define EXIM_GROUPLIST_SIZE NGROUPS_MAX
+#endif
+
+/* Linux has TCP_CORK, FreeBSD has TCP_NOPUSH; they do pretty much the same */
+
+#ifdef TCP_CORK
+# define EXIM_TCP_CORK TCP_CORK
+#elif defined(TCP_NOPUSH)
+# define EXIM_TCP_CORK TCP_NOPUSH
#endif
-/* Wrapper around read(2) to read all the data we requested (BLOCKING) */
-ssize_t
-readn(int fd, void *buffer, size_t len);
+/* LibreSSL seems to not push out the SMTP response to QUIT with our usual
+handling which is trying to get the client to FIN first so that the server does
+not get the TIME_WAIT */
+
+#if !defined(DISABLE_TLS) && defined(USE_OPENSSL) && defined(LIBRESSL_VERSION_NUMBER)
+# define SERVERSIDE_CLOSE_NOWAIT
+#endif
#endif
/* End of exim.h */
git://git.exim.org / exim.git / blobdiff