Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 303 insertions, 0 deletions

diff --git a/src/trivial-rewrite/rewrite.c b/src/trivial-rewrite/rewrite.c
new file mode 100644
index 0000000..483463c
--- /dev/null
+++ b/src/trivial-rewrite/rewrite.c
@@ -0,0 +1,303 @@
+/*++
+/* NAME
+/*	rewrite 3
+/* SUMMARY
+/*	mail address rewriter
+/* SYNOPSIS
+/*	#include "trivial-rewrite.h"
+/*
+/*	void	rewrite_init(void)
+/*
+/*	void	rewrite_proto(stream)
+/*	VSTREAM	*stream;
+/*
+/*	void	rewrite_addr(context, addr, result)
+/*	RWR_CONTEXT *context;
+/*	char	*addr;
+/*	VSTRING *result;
+/*
+/*	void	rewrite_tree(context, tree)
+/*	RWR_CONTEXT *context;
+/*	TOK822	*tree;
+/*
+/*	RWR_CONTEXT local_context;
+/*	RWR_CONTEXT remote_context;
+/* DESCRIPTION
+/*	This module implements the trivial address rewriting engine.
+/*
+/*	rewrite_init() initializes data structures that are private
+/*	to this module. It should be called once before using the
+/*	actual rewriting routines.
+/*
+/*	rewrite_proto() implements the client-server protocol: read
+/*	one rule set name and one address in external (quoted) form,
+/*	reply with the rewritten address in external form.
+/*
+/*	rewrite_addr() rewrites an address string to another string.
+/*	Both input and output are in external (quoted) form.
+/*
+/*	rewrite_tree() rewrites a parse tree with a single address to
+/*	another tree.  A tree is a dummy node on top of a token list.
+/*
+/*	local_context and remote_context provide domain names for
+/*	completing incomplete address forms.
+/* STANDARDS
+/* DIAGNOSTICS
+/*	Problems and transactions are logged to \fBsyslogd\fR(8)
+/*	or \fBpostlogd\fR(8).
+/* BUGS
+/* SEE ALSO
+/* 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 <stdlib.h>
+#include <string.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include <split_at.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <mail_proto.h>
+#include <resolve_local.h>
+#include <tok822.h>
+#include <mail_conf.h>
+
+/* Application-specific. */
+
+#include "trivial-rewrite.h"
+
+RWR_CONTEXT local_context = {
+    VAR_MYORIGIN, &var_myorigin,
+    VAR_MYDOMAIN, &var_mydomain,
+};
+
+RWR_CONTEXT remote_context = {
+    VAR_REM_RWR_DOMAIN, &var_remote_rwr_domain,
+    VAR_REM_RWR_DOMAIN, &var_remote_rwr_domain,
+};
+
+static VSTRING *ruleset;
+static VSTRING *address;
+static VSTRING *result;
+
+/* rewrite_tree - rewrite address according to rule set */
+
+void    rewrite_tree(RWR_CONTEXT *context, TOK822 *tree)
+{
+    TOK822 *colon;
+    TOK822 *domain;
+    TOK822 *bang;
+    TOK822 *local;
+    VSTRING *vstringval;
+
+    /*
+     * XXX If you change this module, quote_822_local.c, or tok822_parse.c,
+     * be sure to re-run the tests under "make rewrite_clnt_test" and "make
+     * resolve_clnt_test" in the global directory.
+     */
+
+    /*
+     * Sanity check.
+     */
+    if (tree->head == 0)
+	msg_panic("rewrite_tree: empty tree");
+
+    /*
+     * An empty address is a special case.
+     */
+    if (tree->head == tree->tail
+	&& tree->tail->type == TOK822_QSTRING
+	&& VSTRING_LEN(tree->tail->vstr) == 0)
+	return;
+
+    /*
+     * Treat a lone @ as if it were an empty address.
+     */
+    if (tree->head == tree->tail
+	&& tree->tail->type == '@') {
+	tok822_free_tree(tok822_sub_keep_before(tree, tree->tail));
+	tok822_sub_append(tree, tok822_alloc(TOK822_QSTRING, ""));
+	return;
+    }
+
+    /*
+     * Strip source route.
+     */
+    if (tree->head->type == '@'
+	&& (colon = tok822_find_type(tree->head, ':')) != 0
+	&& colon != tree->tail)
+	tok822_free_tree(tok822_sub_keep_after(tree, colon));
+
+    /*
+     * Optionally, transform address forms without @.
+     */
+    if ((domain = tok822_rfind_type(tree->tail, '@')) == 0) {
+
+	/*
+	 * Swap domain!user to user@domain.
+	 */
+	if (var_swap_bangpath != 0
+	    && (bang = tok822_find_type(tree->head, '!')) != 0) {
+	    tok822_sub_keep_before(tree, bang);
+	    local = tok822_cut_after(bang);
+	    tok822_free(bang);
+	    tok822_sub_prepend(tree, tok822_alloc('@', (char *) 0));
+	    if (local)
+		tok822_sub_prepend(tree, local);
+	}
+
+	/*
+	 * Promote user%domain to user@domain.
+	 */
+	else if (var_percent_hack != 0
+		 && (domain = tok822_rfind_type(tree->tail, '%')) != 0) {
+	    domain->type = '@';
+	}
+
+	/*
+	 * Append missing @origin
+	 */
+	else if (var_append_at_myorigin != 0
+		 && REW_PARAM_VALUE(context->origin) != 0
+		 && REW_PARAM_VALUE(context->origin)[0] != 0) {
+	    domain = tok822_sub_append(tree, tok822_alloc('@', (char *) 0));
+	    tok822_sub_append(tree, tok822_scan(REW_PARAM_VALUE(context->origin),
+						(TOK822 **) 0));
+	}
+    }
+
+    /*
+     * Append missing .domain, but leave broken forms ending in @ alone. This
+     * merely makes diagnostics more accurate by leaving bogus addresses
+     * alone.
+     * 
+     * Backwards-compatibility warning: warn for "user@localhost" when there is
+     * no "localhost" in mydestination or in any other address class with an
+     * explicit domain list.
+     */
+    if (var_append_dot_mydomain != 0
+	&& REW_PARAM_VALUE(context->domain) != 0
+	&& REW_PARAM_VALUE(context->domain)[0] != 0
+	&& (domain = tok822_rfind_type(tree->tail, '@')) != 0
+	&& domain != tree->tail
+	&& tok822_find_type(domain, TOK822_DOMLIT) == 0
+	&& tok822_find_type(domain, '.') == 0) {
+	if (warn_compat_break_app_dot_mydomain
+	    && (vstringval = domain->next->vstr) != 0) {
+	    if (strcasecmp(vstring_str(vstringval), "localhost") != 0) {
+		msg_info("using backwards-compatible default setting "
+			 VAR_APP_DOT_MYDOMAIN "=yes to rewrite \"%s\" to "
+			 "\"%s.%s\"", vstring_str(vstringval),
+			 vstring_str(vstringval), var_mydomain);
+	    } else if (resolve_class("localhost") == RESOLVE_CLASS_DEFAULT) {
+		msg_info("using backwards-compatible default setting "
+			 VAR_APP_DOT_MYDOMAIN "=yes to rewrite \"%s\" to "
+			 "\"%s.%s\"; please add \"localhost\" to "
+			 "mydestination or other address class",
+			 vstring_str(vstringval), vstring_str(vstringval),
+			 var_mydomain);
+	    }
+	}
+	tok822_sub_append(tree, tok822_alloc('.', (char *) 0));
+	tok822_sub_append(tree, tok822_scan(REW_PARAM_VALUE(context->domain),
+					    (TOK822 **) 0));
+    }
+
+    /*
+     * Strip trailing dot at end of domain, but not dot-dot or @-dot. This
+     * merely makes diagnostics more accurate by leaving bogus addresses
+     * alone.
+     */
+    if (tree->tail->type == '.'
+	&& tree->tail->prev
+	&& tree->tail->prev->type != '.'
+	&& tree->tail->prev->type != '@')
+	tok822_free_tree(tok822_sub_keep_before(tree, tree->tail));
+}
+
+/* rewrite_proto - read request and send reply */
+
+int     rewrite_proto(VSTREAM *stream)
+{
+    RWR_CONTEXT *context;
+    TOK822 *tree;
+
+    if (attr_scan(stream, ATTR_FLAG_STRICT,
+		  RECV_ATTR_STR(MAIL_ATTR_RULE, ruleset),
+		  RECV_ATTR_STR(MAIL_ATTR_ADDR, address),
+		  ATTR_TYPE_END) != 2)
+	return (-1);
+
+    if (strcmp(vstring_str(ruleset), MAIL_ATTR_RWR_LOCAL) == 0)
+	context = &local_context;
+    else if (strcmp(vstring_str(ruleset), MAIL_ATTR_RWR_REMOTE) == 0)
+	context = &remote_context;
+    else {
+	msg_warn("unknown context: %s", vstring_str(ruleset));
+	return (-1);
+    }
+
+    /*
+     * Sanity check. An address is supposed to be in externalized form.
+     */
+    if (*vstring_str(address) == 0) {
+	msg_warn("rewrite_addr: null address");
+	vstring_strcpy(result, vstring_str(address));
+    }
+
+    /*
+     * Convert the address from externalized (quoted) form to token list,
+     * rewrite it, and convert back.
+     */
+    else {
+	tree = tok822_scan_addr(vstring_str(address));
+	rewrite_tree(context, tree);
+	tok822_externalize(result, tree, TOK822_STR_DEFL);
+	tok822_free_tree(tree);
+    }
+    if (msg_verbose)
+	msg_info("`%s' `%s' -> `%s'", vstring_str(ruleset),
+		 vstring_str(address), vstring_str(result));
+
+    attr_print(stream, ATTR_FLAG_NONE,
+	       SEND_ATTR_INT(MAIL_ATTR_FLAGS, server_flags),
+	       SEND_ATTR_STR(MAIL_ATTR_ADDR, vstring_str(result)),
+	       ATTR_TYPE_END);
+
+    if (vstream_fflush(stream) != 0) {
+	msg_warn("write rewrite reply: %m");
+	return (-1);
+    }
+    return (0);
+}
+
+/* rewrite_init - module initializations */
+
+void    rewrite_init(void)
+{
+    ruleset = vstring_alloc(100);
+    address = vstring_alloc(100);
+    result = vstring_alloc(100);
+}