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exim: add package 

Add Exim MTA variants:
 * exim
   plain variant without any TLS library which hence comes
   without TLS, DANE and DKIM.
 * exim-openssl
   linked against libopenssl
 * exim-gnutls
   linked against libgnutls
 * exim-ldap
   linked against libopenssl, libopenldap and libsasl2

Provide packages for lookup modules
 * cdb
 * dbmdb
 * dnsdb
 * json (depends on jansson)
 * mysql (depends on libmariadb)
 * passwd
 * pgsql (depends on libpq)
 * redis (depends on libhiredis)
 * sqlite (depends on libsqlite3)

Note:
As gnutls requires libunbound which depends on libopenssl to provide
libgnutls-dane, disable DANE by default when building with gnutls.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2020-12-26 03:11:17 +00:00 committed by Daniel Golle
parent ec7109ec12
commit cd587f3767
4 changed files with 579 additions and 0 deletions
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288
mail/exim/Makefile Normal file
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@ -0,0 +1,288 @@
include $(TOPDIR)/rules.mk
PKG_NAME:=exim
PKG_VERSION:=4.94
PKG_RELEASE:=1
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
PKG_SOURCE_URL:=https://ftp.exim.org/pub/exim/exim4/
PKG_HASH:=f77ee8faf04f5db793243c3ae81c1f4e452cd6ad7dd515a80edf755c4b144bdb
PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
PKG_LICENSE:=GPL-2.0-or-later
PKG_LICENSE_FILES:=LICENSE NOTICE
PKG_CPE_ID:=cpe:/a:exim:exim
PKG_CONFIG_DEPENDS:=\
CONFIG_BUILD_NLS \
CONFIG_PACKAGE_exim \
CONFIG_PACKAGE_exim-gnutls \
CONFIG_EXIM_GNUTLS_DANE \
CONFIG_PACKAGE_exim-openssl \
CONFIG_PACKAGE_exim-ldap \
CONFIG_PACKAGE_exim-lookup-mysql \
CONFIG_PACKAGE_exim-lookup-pgsql \
CONFIG_PACKAGE_exim-lookup-redis \
CONFIG_PACKAGE_exim-lookup-sqlite
PKG_BUILD_PARALLEL:=1
include $(INCLUDE_DIR)/package.mk
include $(INCLUDE_DIR)/host-build.mk
include $(INCLUDE_DIR)/nls.mk
LOOKUPS:= \
cdb \
dbmdb \
dnsdb \
json%+PACKAGE_exim-lookup-json:jansson \
mysql%+PACKAGE_exim-lookup-mysql:libmariadb \
passwd \
pgsql%+PACKAGE_exim-lookup-pgsql:libpq \
redis%+PACKAGE_exim-lookup-redis:libhiredis \
sqlite%+PACKAGE_exim-lookup-sqlite:libsqlite3
define Package/exim/Default
SECTION:=mail
CATEGORY:=Mail
DEPENDS:=+libdb47 +libpcre $(ICONV_DEPENDS) +BUILD_NLS:libidn2 +BUILD_NLS:libidn
TITLE:=Exim message transfer agent
URL:=http://www.exim.org/
USERID:=mail=42:mail=42
endef
define Package/exim
$(call Package/exim/Default)
VARIANT:=nossl
CONFLICTS:=exim-openssl exim-gnutls exim-ldap
endef
define Package/exim-gnutls
$(call Package/exim/Default)
TITLE+=(with GnuTLS)
VARIANT:=gnutls
DEPENDS+=+PACKAGE_exim-gnutls:libgnutls +EXIM_GNUTLS_DANE:libgnutls-dane
PROVIDES:=exim
CONFLICTS:=exim-openssl exim-ldap
endef
define Package/exim-openssl
$(call Package/exim/Default)
TITLE+=(with OpenSSL)
VARIANT:=openssl
DEPENDS+=+PACKAGE_exim-openssl:libopenssl
PROVIDES:=exim
CONFLICTS:=exim-ldap
endef
define Package/exim-ldap
$(call Package/exim/Default)
TITLE+=(with OpenSSL and OpenLDAP)
VARIANT:=ldap
DEPENDS+=+PACKAGE_exim-ldap:libopenssl +PACKAGE_exim-ldap:libsasl2 +PACKAGE_exim-ldap:libopenldap
PROVIDES:=exim
endef
define Package/exim/Default/description
Exim is a message transfer agent (MTA) developed at the University of
Cambridge for use on Unix systems connected to the Internet.
endef
define Package/exim/description
$(call Package/exim/Default/description)
This package provides Exim without TLS support.
endef
define Package/exim-gnutls/description
$(call Package/exim/Default/description)
This package provides Exim built with GnuTLS.
endef
define Package/exim-gnutls/config
config EXIM_GNUTLS_DANE
bool "exim-gnutls DANE support"
depends on PACKAGE_exim-gnutls
default n
help
Build exim-gnutls against libgnutls-dane for DANE support.
libgnutls-dane depends on libunbound which depends on libopenssl.
endef
define Package/exim-openssl/description
$(call Package/exim/Default/description)
This package provides Exim built with OpenSSL.
endef
define Package/exim-ldap/description
$(call Package/exim/Default/description)
This package provides Exim built with OpenSSL, OpenLDAP and Cyrus SASL.
endef
define LookupGen
define Package/exim-lookup-$(subst _,-,$(firstword $(subst %, ,$(1))))
SECTION:=mail
CATEGORY:=Mail
TITLE:=Exim lookup module $(firstword $(subst %, ,$(1)))
URL:=http://www.exim.org/
DEPENDS:=exim $(wordlist 2,$(words $(subst %, ,$(1))),$(subst %, ,$(1)))
endef
endef
$(foreach file,$(LOOKUPS),$(eval $(call LookupGen,$(file))))
define Package/exim/conffiles
/etc/exim/exim.conf
endef
TARGET_CFLAGS += $(FPIC) -DNO_IP_OPTIONS -D_FILE_OFFSET_BITS=64
MAKE_VARS += build=Linux-$$(ARCH)
MAKE_FLAGS += AR="$$(TARGET_AR) r"
HOST_MAKE_VARS += build=Linux-$$(ARCH)
define Build/Configure
$(CP) $(PKG_BUILD_DIR)/src/EDITME $(PKG_BUILD_DIR)/Local/Makefile
echo "PID_FILE_PATH=/var/run/exim.pid" >> $(PKG_BUILD_DIR)/Local/Makefile
echo "BIN_DIRECTORY=/usr/sbin" >> $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%CONFIGURE_FILE=/usr/exim/configure%CONFIGURE_FILE=/etc/exim/exim.conf%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# EXIM_GROUP=%EXIM_GROUP=42%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# EXIM_USER=exim%EXIM_USER=42%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# INCLUDE=.*%INCLUDE=-I$(STAGING_DIR)/usr/include -I$(STAGING_DIR)/usr/include%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# HAVE_IPV6=YES%HAVE_IPV6=YES%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# WITH_CONTENT_SCAN=yes%WITH_CONTENT_SCAN=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# SUPPORT_MAILDIR=yes%SUPPORT_MAILDIR=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# SUPPORT_MAILSTORE=yes%SUPPORT_MAILSTORE=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# SUPPORT_MBX=yes%SUPPORT_MBX=yes%' $(PKG_BUILD_DIR)/Local/Makefile
# enable lookup modules
$(SED) 's%# LOOKUP_DSEARCH=yes%LOOKUP_DSEARCH=yes%' $(PKG_BUILD_DIR)/Local/Makefile
ifdef CONFIG_PACKAGE_exim-lookup-dbmdb
$(SED) 's%LOOKUP_DBM=yes%LOOKUP_DBM=2%' $(PKG_BUILD_DIR)/Local/Makefile
else
$(SED) 's%LOOKUP_DBM=yes%# LOOKUP_DBM=yes%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-dnsdb
$(SED) 's%LOOKUP_DNSDB=yes%LOOKUP_DNSDB=2%' $(PKG_BUILD_DIR)/Local/Makefile
else
$(SED) 's%LOOKUP_DNSDB=yes%# LOOKUP_DNSDB=yes%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-passwd
$(SED) 's%# LOOKUP_PASSWD=yes%LOOKUP_PASSWD=2%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-cdb
$(SED) 's%# LOOKUP_CDB=yes%LOOKUP_CDB=2%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-json
$(SED) 's%# LOOKUP_JSON=yes%LOOKUP_JSON=2\
\nLOOKUP_JSON_INCLUDE=-I$(STAGING_DIR)/usr/include\
\nLOOKUP_JSON_LIBS=-Wl,--no-as-needed -ljansson%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-pgsql
$(SED) 's%# LOOKUP_PGSQL=yes%LOOKUP_PGSQL=2\
\nLOOKUP_PGSQL_LIBS=-Wl,--no-as-needed -lpq%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-sqlite
$(SED) 's%# LOOKUP_SQLITE=yes%LOOKUP_SQLITE=2\
\nLOOKUP_SQLITE_LIBS=-Wl,--no-as-needed -lsqlite3%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-mysql
$(SED) 's%# LOOKUP_MYSQL=yes%LOOKUP_MYSQL=2\
\nLOOKUP_MYSQL_INCLUDE=-I$(STAGING_DIR)/usr/include/mysql\
\nLOOKUP_MYSQL_LIBS=-Wl,--no-as-needed -lmysqlclient%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifdef CONFIG_PACKAGE_exim-lookup-redis
$(SED) 's%# LOOKUP_REDIS=yes%LOOKUP_REDIS=2\
\nLOOKUP_REDIS_INCLUDE=-I$(STAGING_DIR)/usr/include/hiredis\
\nLOOKUP_REDIS_LIBS=-Wl,--no-as-needed -lhiredis%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifeq ($(CONFIG_BUILD_NLS),y)
$(SED) 's%# HAVE_ICONV=yes%HAVE_ICONV=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# CFLAGS=-O -I/usr/local/include%CFLAGS=$(TARGET_CFLAGS) $(ICONV_CPPFLAGS)%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# EXTRALIBS_EXIM=-L/usr/local/lib -liconv%EXTRALIBS_EXIM=-export-dynamic -rdynamic $(ICONV_LDFLAGS) -liconv -ldl%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# SUPPORT_I18N_2008=yes%SUPPORT_I18N_2008=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# LDFLAGS += -lidn -lidn2%LDFLAGS += -lidn -lidn2%' $(PKG_BUILD_DIR)/Local/Makefile
else
$(SED) 's%# HAVE_ICONV=yes%HAVE_ICONV=no%' $(PKG_BUILD_DIR)/Local/Makefile
endif
$(SED) 's%# AUTH_CRAM_MD5=yes%AUTH_CRAM_MD5=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# AUTH_DOVECOT=yes%AUTH_DOVECOT=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# AUTH_EXTERNAL=yes%AUTH_EXTERNAL=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# AUTH_PLAINTEXT=yes%AUTH_PLAINTEXT=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# AUTH_SPA=yes%AUTH_SPA=yes%' $(PKG_BUILD_DIR)/Local/Makefile
ifeq ($(BUILD_VARIANT),gnutls)
$(SED) 's%# USE_GNUTLS=yes%USE_GNUTLS=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# TLS_INCLUDE=-I/usr/local/.*%TLS_INCLUDE=-I$(STAGING_DIR)/usr/include%' $(PKG_BUILD_DIR)/Local/Makefile
ifeq ($(CONFIG_EXIM_GNUTLS_DANE),y)
$(SED) 's%# TLS_LIBS=-lgnutls -lgnutls-dane%TLS_LIBS=-L$(STAGING_DIR)/usr/lib -lgnutls -lgnutls-dane%' $(PKG_BUILD_DIR)/Local/Makefile
else
$(SED) 's%SUPPORT_DANE=yes%# SUPPORT_DANE=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# TLS_LIBS=-lgnutls -lgnutls-dane%TLS_LIBS=-L$(STAGING_DIR)/usr/lib -lgnutls%' $(PKG_BUILD_DIR)/Local/Makefile
endif
$(SED) 's%# AUTH_TLS=yes%AUTH_TLS=yes%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifneq ($(filter ldap openssl, $(BUILD_VARIANT)),)
$(SED) 's%# USE_OPENSSL=yes%USE_OPENSSL=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# TLS_INCLUDE=-I/usr/local/.*%TLS_INCLUDE=-I$(STAGING_DIR)/usr/include%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# TLS_LIBS=-lssl -lcrypto%TLS_LIBS=-L$(STAGING_DIR)/usr/lib -lssl -lcrypto%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# AUTH_TLS=yes%AUTH_TLS=yes%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifeq ($(BUILD_VARIANT),ldap)
$(SED) 's%# LOOKUP_LDAP=yes%LOOKUP_LDAP=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# LDAP_LIB_TYPE=OPENLDAP2%LDAP_LIB_TYPE=OPENLDAP2%' $(PKG_BUILD_DIR)/Local/Makefile
echo "LOOKUP_LIBS+=-lldap -llber" >> $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# AUTH_CYRUS_SASL=yes%AUTH_CYRUS_SASL=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# AUTH_LIBS=-lsasl2%AUTH_LIBS=-lsasl2%' $(PKG_BUILD_DIR)/Local/Makefile
endif
ifeq ($(BUILD_VARIANT),nossl)
$(SED) 's%# DISABLE_TLS=yes%DISABLE_TLS=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%SUPPORT_DANE=yes%# SUPPORT_DANE=yes%' $(PKG_BUILD_DIR)/Local/Makefile
endif
$(SED) 's%# CFLAGS_DYNAMIC=-shared -rdynamic -fPIC%CFLAGS_DYNAMIC=-shared -rdynamic $(FPIC)%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%# LOOKUP_MODULE_DIR=/usr/lib/exim/lookups/%LOOKUP_MODULE_DIR=/usr/lib/exim/lookups/%' $(PKG_BUILD_DIR)/Local/Makefile
$(SED) 's%#DLOPEN_LOCAL_SCAN=yes%DLOPEN_LOCAL_SCAN=yes%' $(PKG_BUILD_DIR)/Local/Makefile
$(call Build/Compile/Default,makefile)
$(CP) $(PKG_BUILD_DIR)/OS/os.h-Linux $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
# overwrite types for cross-compile
# (is all the below true for glibc as well?)
echo '#include <inttypes.h>' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#define ip_options ip_opts' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#undef OFF_T_FMT' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#define OFF_T_FMT "%" PRId64' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#undef LONGLONG_T' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#define LONGLONG_T int64_t' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#ifndef NS_MAXMSG' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#define NS_MAXMSG 65535' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
echo '#endif' >> $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/os.h
$(HOST_MAKE_VARS) $(MAKE) $(HOST_MAKE_FLAGS) $(HOST_MAKE_VARS) -C $(PKG_BUILD_DIR)/build-Linux-$(ARCH) macro_predef
endef
define Package/exim/install
$(INSTALL_DIR) $(1)/usr/sbin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/build-Linux-$(ARCH)/exim $(1)/usr/sbin
endef
Package/exim-gnutls/install = $(Package/exim/install)
Package/exim-openssl/install = $(Package/exim/install)
Package/exim-ldap/install = $(Package/exim/install)
define LookupInstall
define Package/exim-lookup-$(subst _,-,$(firstword $(subst %, ,$(1))))/install
$(INSTALL_DIR) $$(1)/usr/lib/exim/lookups
$(INSTALL_BIN) \
$(PKG_BUILD_DIR)/build-Linux-$(ARCH)/lookups/$(firstword $(subst %, ,$(1))).so \
$$(1)/usr/lib/exim/lookups
endef
endef
$(foreach file,$(LOOKUPS),$(eval $(call LookupInstall,$(file))))
$(eval $(call BuildPackage,exim))
$(eval $(call BuildPackage,exim-gnutls))
$(eval $(call BuildPackage,exim-openssl))
$(eval $(call BuildPackage,exim-ldap))
$(foreach file,$(LOOKUPS),$(eval $(call BuildPackage,exim-lookup-$(subst _,-,$(firstword $(subst %, ,$(file)))))))

11
mail/exim/patches/010-allow-json-dynamic-lookup.patch Normal file
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@ -0,0 +1,11 @@
--- a/src/drtables.c
+++ b/src/drtables.c
@@ -662,7 +662,7 @@ addlookupmodule(NULL, &ibase_lookup_modu
addlookupmodule(NULL, &ldap_lookup_module_info);
#endif
-#ifdef LOOKUP_JSON
+#if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
addlookupmodule(NULL, &json_lookup_module_info);
#endif

22
mail/exim/patches/020-use-correct-printf-format-for-size-t.patch Normal file
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@ -0,0 +1,22 @@
From: Daniel Golle <daniel@makrotopia.org>
Date: Sun, 27 Dec 2020 15:03:22 +0000
Subject: [PATCH] use correct printf format for size_t
pdkim.c: In function 'check_bare_ed25519_pubkey':
pdkim.c:1355:60: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
DEBUG(D_acl) debug_printf("DKIM: unexpected pubkey len %lu\n", p->key.len);
~~^ ~~~~~~~~~~
%u
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
--- a/src/pdkim/pdkim.c
+++ b/src/pdkim/pdkim.c
@@ -1352,7 +1352,7 @@ check_bare_ed25519_pubkey(pdkim_pubkey *
int excess = p->key.len - 32;
if (excess > 0)
{
- DEBUG(D_acl) debug_printf("DKIM: unexpected pubkey len %lu\n", p->key.len);
+ DEBUG(D_acl) debug_printf("DKIM: unexpected pubkey len %zu\n", p->key.len);
p->key.data += excess; p->key.len = 32;
}
}

258
mail/exim/patches/100-localscan_dlopen.patch Normal file
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@ -0,0 +1,258 @@
--- a/src/config.h.defaults
+++ b/src/config.h.defaults
@@ -33,6 +33,8 @@ Do not put spaces between # and the 'def
#define AUTH_VARS 3
+#define DLOPEN_LOCAL_SCAN
+
#define BIN_DIRECTORY
#define CONFIGURE_FILE
--- a/src/EDITME
+++ b/src/EDITME
@@ -877,6 +877,24 @@ HEADERS_CHARSET="ISO-8859-1"
#------------------------------------------------------------------------------
+# On systems which support dynamic loading of shared libraries, Exim can
+# load a local_scan function specified in its config file instead of having
+# to be recompiled with the desired local_scan function. For a full
+# description of the API to this function, see the Exim specification.
+
+#DLOPEN_LOCAL_SCAN=yes
+
+# If you set DLOPEN_LOCAL_SCAN, then you need to include -rdynamic in the
+# linker flags. Without it, the loaded .so won't be able to access any
+# functions from exim.
+
+LFLAGS = -rdynamic
+ifeq ($(OSTYPE),Linux)
+LFLAGS += -ldl
+endif
+
+
+#------------------------------------------------------------------------------
# The default distribution of Exim contains only the plain text form of the
# documentation. Other forms are available separately. If you want to install
# the documentation in "info" format, first fetch the Texinfo documentation
--- a/src/globals.c
+++ b/src/globals.c
@@ -42,6 +42,10 @@ int optionlist_auths_size = nelem(op
uschar *no_aliases = NULL;
+#ifdef DLOPEN_LOCAL_SCAN
+uschar *local_scan_path = NULL;
+#endif
+
/* For comments on these variables, see globals.h. I'm too idle to
duplicate them here... */
--- a/src/globals.h
+++ b/src/globals.h
@@ -162,6 +162,9 @@ extern int (*receive_feof)(void);
extern int (*receive_ferror)(void);
extern BOOL (*receive_smtp_buffered)(void);
+#ifdef DLOPEN_LOCAL_SCAN
+extern uschar *local_scan_path; /* Path to local_scan() library */
+#endif
/* For clearing, saving, restoring address expansion variables. We have to have
the size of this vector set explicitly, because it is referenced from more than
--- a/src/local_scan.c
+++ b/src/local_scan.c
@@ -5,61 +5,133 @@
/* Copyright (c) University of Cambridge 1995 - 2009 */
/* See the file NOTICE for conditions of use and distribution. */
-
-/******************************************************************************
-This file contains a template local_scan() function that just returns ACCEPT.
-If you want to implement your own version, you should copy this file to, say
-Local/local_scan.c, and edit the copy. To use your version instead of the
-default, you must set
-
-HAVE_LOCAL_SCAN=yes
-LOCAL_SCAN_SOURCE=Local/local_scan.c
-
-in your Local/Makefile. This makes it easy to copy your version for use with
-subsequent Exim releases.
-
-For a full description of the API to this function, see the Exim specification.
-******************************************************************************/
-
-
-/* This is the only Exim header that you should include. The effect of
-including any other Exim header is not defined, and may change from release to
-release. Use only the documented interface! */
-
#include "local_scan.h"
-
-/* This is a "do-nothing" version of a local_scan() function. The arguments
-are:
-
- fd The file descriptor of the open -D file, which contains the
- body of the message. The file is open for reading and
- writing, but modifying it is dangerous and not recommended.
-
- return_text A pointer to an unsigned char* variable which you can set in
- order to return a text string. It is initialized to NULL.
-
-The return values of this function are:
-
- LOCAL_SCAN_ACCEPT
- The message is to be accepted. The return_text argument is
- saved in $local_scan_data.
-
- LOCAL_SCAN_REJECT
- The message is to be rejected. The returned text is used
- in the rejection message.
-
- LOCAL_SCAN_TEMPREJECT
- This specifies a temporary rejection. The returned text
- is used in the rejection message.
-*/
+#ifdef DLOPEN_LOCAL_SCAN
+#include <stdlib.h>
+#include <dlfcn.h>
+static int (*local_scan_fn)(int fd, uschar **return_text) = NULL;
+static int load_local_scan_library(void);
+extern uschar *local_scan_path; /* Path to local_scan() library */
+#endif
int
local_scan(int fd, uschar **return_text)
{
fd = fd; /* Keep picky compilers happy */
return_text = return_text;
-return LOCAL_SCAN_ACCEPT;
+#ifdef DLOPEN_LOCAL_SCAN
+/* local_scan_path is defined AND not the empty string */
+if (local_scan_path && *local_scan_path)
+ {
+ if (!local_scan_fn)
+ {
+ if (!load_local_scan_library())
+ {
+ char *base_msg , *error_msg , *final_msg ;
+ int final_length = -1 ;
+
+ base_msg=US"Local configuration error - local_scan() library failure\n";
+ error_msg = dlerror() ;
+
+ final_length = strlen(base_msg) + strlen(error_msg) + 1 ;
+ final_msg = (char*)malloc( final_length*sizeof(char) ) ;
+ *final_msg = '\0' ;
+
+ strcat( final_msg , base_msg ) ;
+ strcat( final_msg , error_msg ) ;
+
+ *return_text = final_msg ;
+ return LOCAL_SCAN_TEMPREJECT;
+ }
+ }
+ return local_scan_fn(fd, return_text);
+ }
+else
+#endif
+ return LOCAL_SCAN_ACCEPT;
}
+#ifdef DLOPEN_LOCAL_SCAN
+
+static int load_local_scan_library(void)
+{
+/* No point in keeping local_scan_lib since we'll never dlclose() anyway */
+void *local_scan_lib = NULL;
+int (*local_scan_version_fn)(void);
+int vers_maj;
+int vers_min;
+
+local_scan_lib = dlopen(local_scan_path, RTLD_NOW);
+if (!local_scan_lib)
+ {
+ log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() library open failed - "
+ "message temporarily rejected");
+ return FALSE;
+ }
+
+local_scan_version_fn = dlsym(local_scan_lib, "local_scan_version_major");
+if (!local_scan_version_fn)
+ {
+ dlclose(local_scan_lib);
+ log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() library doesn't contain "
+ "local_scan_version_major() function - message temporarily rejected");
+ return FALSE;
+ }
+
+/* The major number is increased when the ABI is changed in a non
+ backward compatible way. */
+vers_maj = local_scan_version_fn();
+
+local_scan_version_fn = dlsym(local_scan_lib, "local_scan_version_minor");
+if (!local_scan_version_fn)
+ {
+ dlclose(local_scan_lib);
+ log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() library doesn't contain "
+ "local_scan_version_minor() function - message temporarily rejected");
+ return FALSE;
+ }
+
+/* The minor number is increased each time a new feature is added (in a
+ way that doesn't break backward compatibility) -- Marc */
+vers_min = local_scan_version_fn();
+
+
+if (vers_maj != LOCAL_SCAN_ABI_VERSION_MAJOR)
+ {
+ dlclose(local_scan_lib);
+ local_scan_lib = NULL;
+ log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() has an incompatible major"
+ "version number, you need to recompile your module for this version"
+ "of exim (The module was compiled for version %d.%d and this exim provides"
+ "ABI version %d.%d)", vers_maj, vers_min, LOCAL_SCAN_ABI_VERSION_MAJOR,
+ LOCAL_SCAN_ABI_VERSION_MINOR);
+ return FALSE;
+ }
+else if (vers_min > LOCAL_SCAN_ABI_VERSION_MINOR)
+ {
+ dlclose(local_scan_lib);
+ local_scan_lib = NULL;
+ log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() has an incompatible minor"
+ "version number, you need to recompile your module for this version"
+ "of exim (The module was compiled for version %d.%d and this exim provides"
+ "ABI version %d.%d)", vers_maj, vers_min, LOCAL_SCAN_ABI_VERSION_MAJOR,
+ LOCAL_SCAN_ABI_VERSION_MINOR);
+ return FALSE;
+ }
+
+local_scan_fn = dlsym(local_scan_lib, "local_scan");
+if (!local_scan_fn)
+ {
+ dlclose(local_scan_lib);
+ log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() library doesn't contain "
+ "local_scan() function - message temporarily rejected");
+ return FALSE;
+ }
+
+return TRUE;
+}
+
+#endif /* DLOPEN_LOCAL_SCAN */
+
/* End of local_scan.c */
--- a/src/readconf.c
+++ b/src/readconf.c
@@ -205,6 +205,9 @@ static optionlist optionlist_config[] =
{ "local_from_prefix", opt_stringptr, {&local_from_prefix} },
{ "local_from_suffix", opt_stringptr, {&local_from_suffix} },
{ "local_interfaces", opt_stringptr, {&local_interfaces} },
+#ifdef DLOPEN_LOCAL_SCAN
+ { "local_scan_path", opt_stringptr, {&local_scan_path} },
+#endif
#ifdef HAVE_LOCAL_SCAN
{ "local_scan_timeout", opt_time, {&local_scan_timeout} },
#endif