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diff --git a/src/cleanup/cleanup_map1n.c b/src/cleanup/cleanup_map1n.c
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+/*++
+/* NAME
+/* cleanup_map1n 3
+/* SUMMARY
+/* one-to-many address mapping
+/* SYNOPSIS
+/* #include <cleanup.h>
+/*
+/* ARGV *cleanup_map1n_internal(state, addr, maps, propagate)
+/* CLEANUP_STATE *state;
+/* const char *addr;
+/* MAPS *maps;
+/* int propagate;
+/* DESCRIPTION
+/* This module implements one-to-many table mapping via table lookup.
+/* Table lookups are done with quoted (externalized) address forms.
+/* The process is recursive. The recursion terminates when the
+/* left-hand side appears in its own expansion.
+/*
+/* cleanup_map1n_internal() is the interface for addresses in
+/* internal (unquoted) form.
+/* DIAGNOSTICS
+/* When the maximal expansion or recursion limit is reached,
+/* the alias is not expanded and the CLEANUP_STAT_DEFER error
+/* is raised with reason "4.6.0 Alias expansion error".
+/*
+/* When table lookup fails, the alias is not expanded and the
+/* CLEANUP_STAT_WRITE error is raised with reason "4.6.0 Alias
+/* expansion error".
+/* SEE ALSO
+/* mail_addr_map(3) address mappings
+/* mail_addr_find(3) address lookups
+/* 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
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <mymalloc.h>
+#include <msg.h>
+#include <argv.h>
+#include <vstring.h>
+#include <dict.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <mail_addr_map.h>
+#include <cleanup_user.h>
+#include <quote_822_local.h>
+#include <been_here.h>
+
+/* Application-specific. */
+
+#include "cleanup.h"
+
+/* cleanup_map1n_internal - one-to-many table lookups */
+
+ARGV *cleanup_map1n_internal(CLEANUP_STATE *state, const char *addr,
+ MAPS *maps, int propagate)
+{
+ ARGV *argv;
+ ARGV *lookup;
+ int count;
+ int i;
+ int arg;
+ BH_TABLE *been_here;
+ char *saved_lhs;
+
+ /*
+ * Initialize.
+ */
+ argv = argv_alloc(1);
+ argv_add(argv, addr, ARGV_END);
+ argv_terminate(argv);
+ been_here = been_here_init(0, BH_FLAG_FOLD);
+
+ /*
+ * Rewrite the address vector in place. With each map lookup result,
+ * split it into separate addresses, then rewrite and flatten each
+ * address, and repeat the process. Beware: argv is being changed, so we
+ * must index the array explicitly, instead of running along it with a
+ * pointer.
+ */
+#define UPDATE(ptr,new) do { \
+ if (ptr) { myfree(ptr); } ptr = mystrdup(new); \
+ } while (0)
+#define STR vstring_str
+#define RETURN(x) do { \
+ been_here_free(been_here); return (x); \
+ } while (0)
+#define UNEXPAND(argv, addr) do { \
+ argv_truncate((argv), 0); argv_add((argv), (addr), (char *) 0); \
+ } while (0)
+
+ for (arg = 0; arg < argv->argc; arg++) {
+ if (argv->argc > var_virt_expan_limit) {
+ msg_warn("%s: unreasonable %s map expansion size for %s -- "
+ "message not accepted, try again later",
+ state->queue_id, maps->title, addr);
+ state->errs |= CLEANUP_STAT_DEFER;
+ UPDATE(state->reason, "4.6.0 Alias expansion error");
+ UNEXPAND(argv, addr);
+ RETURN(argv);
+ }
+ for (count = 0; /* void */ ; count++) {
+
+ /*
+ * Don't expand an address that already expanded into itself.
+ */
+ if (been_here_check_fixed(been_here, argv->argv[arg]) != 0)
+ break;
+ if (count >= var_virt_recur_limit) {
+ msg_warn("%s: unreasonable %s map nesting for %s -- "
+ "message not accepted, try again later",
+ state->queue_id, maps->title, addr);
+ state->errs |= CLEANUP_STAT_DEFER;
+ UPDATE(state->reason, "4.6.0 Alias expansion error");
+ UNEXPAND(argv, addr);
+ RETURN(argv);
+ }
+ if ((lookup = mail_addr_map_internal(maps, argv->argv[arg],
+ propagate)) != 0) {
+ saved_lhs = mystrdup(argv->argv[arg]);
+ for (i = 0; i < lookup->argc; i++) {
+ if (strlen(lookup->argv[i]) > var_virt_addrlen_limit) {
+ msg_warn("%s: unreasonable %s result %.300s... -- "
+ "message not accepted, try again later",
+ state->queue_id, maps->title, lookup->argv[i]);
+ state->errs |= CLEANUP_STAT_DEFER;
+ UPDATE(state->reason, "4.6.0 Alias expansion error");
+ UNEXPAND(argv, addr);
+ RETURN(argv);
+ }
+ if (i == 0) {
+ UPDATE(argv->argv[arg], lookup->argv[i]);
+ } else {
+ argv_add(argv, lookup->argv[i], ARGV_END);
+ argv_terminate(argv);
+ }
+
+ /*
+ * Allow an address to expand into itself once.
+ */
+ if (strcasecmp_utf8(saved_lhs, lookup->argv[i]) == 0)
+ been_here_fixed(been_here, saved_lhs);
+ }
+ myfree(saved_lhs);
+ argv_free(lookup);
+ } else if (maps->error != 0) {
+ msg_warn("%s: %s map lookup problem for %s -- "
+ "message not accepted, try again later",
+ state->queue_id, maps->title, addr);
+ state->errs |= CLEANUP_STAT_WRITE;
+ UPDATE(state->reason, "4.6.0 Alias expansion error");
+ UNEXPAND(argv, addr);
+ RETURN(argv);
+ } else {
+ break;
+ }
+ }
+ }
+ RETURN(argv);
+}