Adding upstream version 3.7.10.upstream/3.7.10upstream

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

1 files changed, 906 insertions, 0 deletions

diff --git a/src/postalias/postalias.c b/src/postalias/postalias.c
new file mode 100644
index 0000000..9538883
--- /dev/null
+++ b/src/postalias/postalias.c
@@ -0,0 +1,906 @@
+/*++
+/* NAME
+/*	postalias 1
+/* SUMMARY
+/*	Postfix alias database maintenance
+/* SYNOPSIS
+/* .fi
+/*	\fBpostalias\fR [\fB-Nfinoprsuvw\fR] [\fB-c \fIconfig_dir\fR]
+/*	[\fB-d \fIkey\fR] [\fB-q \fIkey\fR]
+/*		[\fIfile_type\fR:]\fIfile_name\fR ...
+/* DESCRIPTION
+/*	The \fBpostalias\fR(1) command creates or queries one or more Postfix
+/*	alias databases, or updates an existing one. The input and output
+/*	file formats are expected to be compatible with Sendmail version 8,
+/*	and are expected to be suitable for use as NIS alias maps.
+/*
+/*	If the result files do not exist they will be created with the
+/*	same group and other read permissions as their source file.
+/*
+/*	While a database update is in progress, signal delivery is
+/*	postponed, and an exclusive, advisory, lock is placed on the
+/*	entire database, in order to avoid surprises in spectator
+/*	processes.
+/*
+/*	The format of Postfix alias input files is described in
+/*	\fBaliases\fR(5).
+/*
+/*	By default the lookup key is mapped to lowercase to make
+/*	the lookups case insensitive; as of Postfix 2.3 this case
+/*	folding happens only with tables whose lookup keys are
+/*	fixed-case strings such as btree:, dbm: or hash:. With
+/*	earlier versions, the lookup key is folded even with tables
+/*	where a lookup field can match both upper and lower case
+/*	text, such as regexp: and pcre:. This resulted in loss of
+/*	information with $\fInumber\fR substitutions.
+/*
+/*	Options:
+/* .IP "\fB-c \fIconfig_dir\fR"
+/*	Read the \fBmain.cf\fR configuration file in the named directory
+/*	instead of the default configuration directory.
+/* .IP "\fB-d \fIkey\fR"
+/*	Search the specified maps for \fIkey\fR and remove one entry per map.
+/*	The exit status is zero when the requested information was found.
+/*
+/*	If a key value of \fB-\fR is specified, the program reads key
+/*	values from the standard input stream. The exit status is zero
+/*	when at least one of the requested keys was found.
+/* .IP \fB-f\fR
+/*	Do not fold the lookup key to lower case while creating or querying
+/*	a table.
+/*
+/*	With Postfix version 2.3 and later, this option has no
+/*	effect for regular expression tables. There, case folding
+/*	is controlled by appending a flag to a pattern.
+/* .IP \fB-i\fR
+/*	Incremental mode. Read entries from standard input and do not
+/*	truncate an existing database. By default, \fBpostalias\fR(1) creates
+/*	a new database from the entries in \fIfile_name\fR.
+/* .IP \fB-N\fR
+/*	Include the terminating null character that terminates lookup keys
+/*	and values. By default, \fBpostalias\fR(1) does whatever
+/*	is the default for
+/*	the host operating system.
+/* .IP \fB-n\fR
+/*	Don't include the terminating null character that terminates lookup
+/*	keys and values. By default, \fBpostalias\fR(1) does whatever
+/*	is the default for
+/*	the host operating system.
+/* .IP \fB-o\fR
+/*	Do not release root privileges when processing a non-root
+/*	input file. By default, \fBpostalias\fR(1) drops root privileges
+/*	and runs as the source file owner instead.
+/* .IP \fB-p\fR
+/*	Do not inherit the file access permissions from the input file
+/*	when creating a new file.  Instead, create a new file with default
+/*	access permissions (mode 0644).
+/* .IP "\fB-q \fIkey\fR"
+/*	Search the specified maps for \fIkey\fR and write the first value
+/*	found to the standard output stream. The exit status is zero
+/*	when the requested information was found.
+/*
+/*	Note: this performs a single query with the key as specified,
+/*	and does not make iterative queries with substrings of the
+/*	key as described in the aliases(5) manual page.
+/*
+/*	If a key value of \fB-\fR is specified, the program reads key
+/*	values from the standard input stream and writes one line of
+/*	\fIkey: value\fR output for each key that was found. The exit
+/*	status is zero when at least one of the requested keys was found.
+/* .IP \fB-r\fR
+/*	When updating a table, do not complain about attempts to update
+/*	existing entries, and make those updates anyway.
+/* .IP \fB-s\fR
+/*	Retrieve all database elements, and write one line of
+/*	\fIkey: value\fR output for each element. The elements are
+/*	printed in database order, which is not necessarily the same
+/*	as the original input order.
+/*	This feature is available in Postfix version 2.2 and later,
+/*	and is not available for all database types.
+/* .IP \fB-u\fR
+/*	Disable UTF-8 support. UTF-8 support is enabled by default
+/*	when "smtputf8_enable = yes". It requires that keys and
+/*	values are valid UTF-8 strings.
+/* .IP \fB-v\fR
+/*	Enable verbose logging for debugging purposes. Multiple \fB-v\fR
+/*	options make the software increasingly verbose.
+/* .IP \fB-w\fR
+/*	When updating a table, do not complain about attempts to update
+/*	existing entries, and ignore those attempts.
+/* .PP
+/*	Arguments:
+/* .IP \fIfile_type\fR
+/*	The database type. To find out what types are supported, use
+/*	the "\fBpostconf -m\fR" command.
+/*
+/*	The \fBpostalias\fR(1) command can query any supported file type,
+/*	but it can create only the following file types:
+/* .RS
+/* .IP \fBbtree\fR
+/*	The output is a btree file, named \fIfile_name\fB.db\fR.
+/*	This is available on systems with support for \fBdb\fR databases.
+/* .IP \fBcdb\fR
+/*	The output is one file named \fIfile_name\fB.cdb\fR.
+/*	This is available on systems with support for \fBcdb\fR databases.
+/* .IP \fBdbm\fR
+/*	The output consists of two files, named \fIfile_name\fB.pag\fR and
+/*	\fIfile_name\fB.dir\fR.
+/*	This is available on systems with support for \fBdbm\fR databases.
+/* .IP \fBfail\fR
+/*	A table that reliably fails all requests. The lookup table
+/*	name is used for logging only. This table exists to simplify
+/*	Postfix error tests.
+/* .IP \fBhash\fR
+/*	The output is a hashed file, named \fIfile_name\fB.db\fR.
+/*	This is available on systems with support for \fBdb\fR databases.
+/* .IP \fBlmdb\fR
+/*	The output is a btree-based file, named \fIfile_name\fB.lmdb\fR.
+/*	\fBlmdb\fR supports concurrent writes and reads from different
+/*	processes, unlike other supported file-based tables.
+/*	This is available on systems with support for \fBlmdb\fR databases.
+/* .IP \fBsdbm\fR
+/*	The output consists of two files, named \fIfile_name\fB.pag\fR and
+/*	\fIfile_name\fB.dir\fR.
+/*	This is available on systems with support for \fBsdbm\fR databases.
+/* .PP
+/*	When no \fIfile_type\fR is specified, the software uses the database
+/*	type specified via the \fBdefault_database_type\fR configuration
+/*	parameter.
+/*	The default value for this parameter depends on the host environment.
+/* .RE
+/* .IP \fIfile_name\fR
+/*	The name of the alias database source file when creating a database.
+/* DIAGNOSTICS
+/*	Problems are logged to the standard error stream and to
+/*	\fBsyslogd\fR(8) or \fBpostlogd\fR(8). No output means that
+/*	no problems were detected. Duplicate entries are skipped and are
+/*	flagged with a warning.
+/*
+/*	\fBpostalias\fR(1) terminates with zero exit status in case of success
+/*	(including successful "\fBpostalias -q\fR" lookup) and terminates
+/*	with non-zero exit status in case of failure.
+/* ENVIRONMENT
+/* .ad
+/* .fi
+/* .IP \fBMAIL_CONFIG\fR
+/*	Directory with Postfix configuration files.
+/* .IP \fBMAIL_VERBOSE\fR
+/*	Enable verbose logging for debugging purposes.
+/* CONFIGURATION PARAMETERS
+/* .ad
+/* .fi
+/*	The following \fBmain.cf\fR parameters are especially relevant to
+/*	this program.
+/*
+/*	The text below provides only a parameter summary. See
+/*	\fBpostconf\fR(5) for more details including examples.
+/* .IP "\fBalias_database (see 'postconf -d' output)\fR"
+/*	The alias databases for \fBlocal\fR(8) delivery that are updated with
+/*	"\fBnewaliases\fR" or with "\fBsendmail -bi\fR".
+/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
+/*	The default location of the Postfix main.cf and master.cf
+/*	configuration files.
+/* .IP "\fBberkeley_db_create_buffer_size (16777216)\fR"
+/*	The per-table I/O buffer size for programs that create Berkeley DB
+/*	hash or btree tables.
+/* .IP "\fBberkeley_db_read_buffer_size (131072)\fR"
+/*	The per-table I/O buffer size for programs that read Berkeley DB
+/*	hash or btree tables.
+/* .IP "\fBdefault_database_type (see 'postconf -d' output)\fR"
+/*	The default database type for use in \fBnewaliases\fR(1), \fBpostalias\fR(1)
+/*	and \fBpostmap\fR(1) commands.
+/* .IP "\fBimport_environment (see 'postconf -d' output)\fR"
+/*	The list of environment variables that a privileged Postfix
+/*	process will import from a non-Postfix parent process, or name=value
+/*	environment overrides.
+/* .IP "\fBsmtputf8_enable (yes)\fR"
+/*	Enable preliminary SMTPUTF8 support for the protocols described
+/*	in RFC 6531, RFC 6532, and RFC 6533.
+/* .IP "\fBsyslog_facility (mail)\fR"
+/*	The syslog facility of Postfix logging.
+/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR"
+/*	A prefix that is prepended to the process name in syslog
+/*	records, so that, for example, "smtpd" becomes "prefix/smtpd".
+/* .PP
+/*	Available in Postfix 2.11 and later:
+/* .IP "\fBlmdb_map_size (16777216)\fR"
+/*	The initial OpenLDAP LMDB database size limit in bytes.
+/* STANDARDS
+/*	RFC 822 (ARPA Internet Text Messages)
+/* SEE ALSO
+/*	aliases(5), format of alias database input file.
+/*	local(8), Postfix local delivery agent.
+/*	postconf(1), supported database types
+/*	postconf(5), configuration parameters
+/*	postmap(1), create/update/query lookup tables
+/*	newaliases(1), Sendmail compatibility interface.
+/*	postlogd(8), Postfix logging
+/*	syslogd(8), system logging
+/* README FILES
+/* .ad
+/* .fi
+/*	Use "\fBpostconf readme_directory\fR" or
+/*	"\fBpostconf html_directory\fR" to locate this information.
+/* .na
+/* .nf
+/*	DATABASE_README, Postfix lookup table overview
+/* 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 <sys/stat.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <msg_vstream.h>
+#include <readlline.h>
+#include <stringops.h>
+#include <split_at.h>
+#include <vstring_vstream.h>
+#include <set_eugid.h>
+#include <warn_stat.h>
+#include <clean_env.h>
+
+/* Global library. */
+
+#include <tok822.h>
+#include <mail_conf.h>
+#include <mail_dict.h>
+#include <mail_params.h>
+#include <mail_version.h>
+#include <mkmap.h>
+#include <mail_task.h>
+#include <dict_proxy.h>
+#include <mail_parm_split.h>
+#include <maillog_client.h>
+
+/* Application-specific. */
+
+#define STR	vstring_str
+#define LEN	VSTRING_LEN
+
+#define POSTALIAS_FLAG_AS_OWNER	(1<<0)	/* open dest as owner of source */
+#define POSTALIAS_FLAG_SAVE_PERM	(1<<1)	/* copy access permission
+						 * from source */
+
+/* postalias - create or update alias database */
+
+static void postalias(char *map_type, char *path_name, int postalias_flags,
+		              int open_flags, int dict_flags)
+{
+    VSTREAM *NOCLOBBER source_fp;
+    VSTRING *line_buffer;
+    MKMAP  *mkmap;
+    int     lineno;
+    int     last_line;
+    VSTRING *key_buffer;
+    VSTRING *value_buffer;
+    TOK822 *tok_list;
+    TOK822 *key_list;
+    TOK822 *colon;
+    TOK822 *value_list;
+    struct stat st;
+    mode_t  saved_mask;
+
+    /*
+     * Initialize.
+     */
+    line_buffer = vstring_alloc(100);
+    key_buffer = vstring_alloc(100);
+    value_buffer = vstring_alloc(100);
+    if ((open_flags & O_TRUNC) == 0) {
+	/* Incremental mode. */
+	source_fp = VSTREAM_IN;
+	vstream_control(source_fp, CA_VSTREAM_CTL_PATH("stdin"), CA_VSTREAM_CTL_END);
+    } else {
+	/* Create database. */
+	if (strcmp(map_type, DICT_TYPE_PROXY) == 0)
+	    msg_fatal("can't create maps via the proxy service");
+	dict_flags |= DICT_FLAG_BULK_UPDATE;
+	if ((source_fp = vstream_fopen(path_name, O_RDONLY, 0)) == 0)
+	    msg_fatal("open %s: %m", path_name);
+    }
+    if (fstat(vstream_fileno(source_fp), &st) < 0)
+	msg_fatal("fstat %s: %m", path_name);
+
+    /*
+     * Turn off group/other read permissions as indicated in the source file.
+     */
+    if ((postalias_flags & POSTALIAS_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
+	saved_mask = umask(022 | (~st.st_mode & 077));
+
+    /*
+     * If running as root, run as the owner of the source file, so that the
+     * result shows proper ownership, and so that a bug in postalias does not
+     * allow privilege escalation.
+     */
+    if ((postalias_flags & POSTALIAS_FLAG_AS_OWNER) && getuid() == 0
+	&& (st.st_uid != geteuid() || st.st_gid != getegid()))
+	set_eugid(st.st_uid, st.st_gid);
+
+    /*
+     * Open the database, create it when it does not exist, truncate it when
+     * it does exist, and lock out any spectators.
+     */
+    mkmap = mkmap_open(map_type, path_name, open_flags, dict_flags);
+
+    /*
+     * And restore the umask, in case it matters.
+     */
+    if ((postalias_flags & POSTALIAS_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
+	umask(saved_mask);
+
+    /*
+     * Trap "exceptions" so that we can restart a bulk-mode update after a
+     * recoverable error.
+     */
+    for (;;) {
+	if (dict_isjmp(mkmap->dict) != 0
+	    && dict_setjmp(mkmap->dict) != 0
+	    && vstream_fseek(source_fp, SEEK_SET, 0) < 0)
+	    msg_fatal("seek %s: %m", VSTREAM_PATH(source_fp));
+
+	/*
+	 * Add records to the database.
+	 */
+	last_line = 0;
+	while (readllines(line_buffer, source_fp, &last_line, &lineno)) {
+
+	    /*
+	     * First some UTF-8 checks sans casefolding.
+	     */
+	    if ((mkmap->dict->flags & DICT_FLAG_UTF8_ACTIVE)
+		&& !allascii(STR(line_buffer))
+		&& !valid_utf8_string(STR(line_buffer), LEN(line_buffer))) {
+		msg_warn("%s, line %d: non-UTF-8 input \"%s\""
+			 " -- ignoring this line",
+			 VSTREAM_PATH(source_fp), lineno, STR(line_buffer));
+		continue;
+	    }
+
+	    /*
+	     * Tokenize the input, so that we do the right thing when a
+	     * quoted localpart contains special characters such as "@", ":"
+	     * and so on.
+	     */
+	    if ((tok_list = tok822_scan(STR(line_buffer), (TOK822 **) 0)) == 0)
+		continue;
+
+	    /*
+	     * Enforce the key:value format. Disallow missing keys,
+	     * multi-address keys, or missing values. In order to specify an
+	     * empty string or value, enclose it in double quotes.
+	     */
+	    if ((colon = tok822_find_type(tok_list, ':')) == 0
+		|| colon->prev == 0 || colon->next == 0
+		|| tok822_rfind_type(colon, ',')) {
+		msg_warn("%s, line %d: need name:value pair",
+			 VSTREAM_PATH(source_fp), lineno);
+		tok822_free_tree(tok_list);
+		continue;
+	    }
+
+	    /*
+	     * Key must be local. XXX We should use the Postfix rewriting and
+	     * resolving services to handle all address forms correctly.
+	     * However, we can't count on the mail system being up when the
+	     * alias database is being built, so we're guessing a bit.
+	     */
+	    if (tok822_rfind_type(colon, '@') || tok822_rfind_type(colon, '%')) {
+		msg_warn("%s, line %d: name must be local",
+			 VSTREAM_PATH(source_fp), lineno);
+		tok822_free_tree(tok_list);
+		continue;
+	    }
+
+	    /*
+	     * Split the input into key and value parts, and convert from
+	     * token representation back to string representation. Convert
+	     * the key to internal (unquoted) form, because the resolver
+	     * produces addresses in internal form. Convert the value to
+	     * external (quoted) form, because it will have to be re-parsed
+	     * upon lookup. Discard the token representation when done.
+	     */
+	    key_list = tok_list;
+	    tok_list = 0;
+	    value_list = tok822_cut_after(colon);
+	    tok822_unlink(colon);
+	    tok822_free(colon);
+
+	    tok822_internalize(key_buffer, key_list, TOK822_STR_DEFL);
+	    tok822_free_tree(key_list);
+
+	    tok822_externalize(value_buffer, value_list, TOK822_STR_DEFL);
+	    tok822_free_tree(value_list);
+
+	    /*
+	     * Store the value under a case-insensitive key.
+	     */
+	    mkmap_append(mkmap, STR(key_buffer), STR(value_buffer));
+	    if (mkmap->dict->error)
+		msg_fatal("table %s:%s: write error: %m",
+			  mkmap->dict->type, mkmap->dict->name);
+	}
+	break;
+    }
+
+    /*
+     * Update or append sendmail and NIS signatures.
+     */
+    if ((open_flags & O_TRUNC) == 0)
+	mkmap->dict->flags |= DICT_FLAG_DUP_REPLACE;
+
+    /*
+     * Sendmail compatibility: add the @:@ signature to indicate that the
+     * database is complete. This might be needed by NIS clients running
+     * sendmail.
+     */
+    mkmap_append(mkmap, "@", "@");
+    if (mkmap->dict->error)
+	msg_fatal("table %s:%s: write error: %m",
+		  mkmap->dict->type, mkmap->dict->name);
+
+    /*
+     * NIS compatibility: add time and master info. Unlike other information,
+     * this information MUST be written without a trailing null appended to
+     * key or value.
+     */
+    mkmap->dict->flags &= ~DICT_FLAG_TRY1NULL;
+    mkmap->dict->flags |= DICT_FLAG_TRY0NULL;
+    vstring_sprintf(value_buffer, "%010ld", (long) time((time_t *) 0));
+#if (defined(HAS_NIS) || defined(HAS_NISPLUS))
+    mkmap->dict->flags &= ~DICT_FLAG_FOLD_FIX;
+    mkmap_append(mkmap, "YP_LAST_MODIFIED", STR(value_buffer));
+    mkmap_append(mkmap, "YP_MASTER_NAME", var_myhostname);
+#endif
+
+    /*
+     * Close the alias database, and release the lock.
+     */
+    mkmap_close(mkmap);
+
+    /*
+     * Cleanup. We're about to terminate, but it is a good sanity check.
+     */
+    vstring_free(value_buffer);
+    vstring_free(key_buffer);
+    vstring_free(line_buffer);
+    if (source_fp != VSTREAM_IN)
+	vstream_fclose(source_fp);
+}
+
+/* postalias_queries - apply multiple requests from stdin */
+
+static int postalias_queries(VSTREAM *in, char **maps, const int map_count,
+			             const int dict_flags)
+{
+    int     found = 0;
+    VSTRING *keybuf = vstring_alloc(100);
+    DICT  **dicts;
+    const char *map_name;
+    const char *value;
+    int     n;
+
+    /*
+     * Sanity check.
+     */
+    if (map_count <= 0)
+	msg_panic("postalias_queries: bad map count");
+
+    /*
+     * Prepare to open maps lazily.
+     */
+    dicts = (DICT **) mymalloc(sizeof(*dicts) * map_count);
+    for (n = 0; n < map_count; n++)
+	dicts[n] = 0;
+
+    /*
+     * Perform all queries. Open maps on the fly, to avoid opening
+     * unnecessary maps.
+     */
+    while (vstring_get_nonl(keybuf, in) != VSTREAM_EOF) {
+	for (n = 0; n < map_count; n++) {
+	    if (dicts[n] == 0)
+		dicts[n] = ((map_name = split_at(maps[n], ':')) != 0 ?
+		       dict_open3(maps[n], map_name, O_RDONLY, dict_flags) :
+		    dict_open3(var_db_type, maps[n], O_RDONLY, dict_flags));
+	    if ((value = dict_get(dicts[n], STR(keybuf))) != 0) {
+		if (*value == 0) {
+		    msg_warn("table %s:%s: key %s: empty string result is not allowed",
+			     dicts[n]->type, dicts[n]->name, STR(keybuf));
+		    msg_warn("table %s:%s should return NO RESULT in case of NOT FOUND",
+			     dicts[n]->type, dicts[n]->name);
+		}
+		vstream_printf("%s:	%s\n", STR(keybuf), value);
+		found = 1;
+		break;
+	    }
+	    if (dicts[n]->error)
+		msg_fatal("table %s:%s: query error: %m",
+			  dicts[n]->type, dicts[n]->name);
+	}
+    }
+    if (found)
+	vstream_fflush(VSTREAM_OUT);
+
+    /*
+     * Cleanup.
+     */
+    for (n = 0; n < map_count; n++)
+	if (dicts[n])
+	    dict_close(dicts[n]);
+    myfree((void *) dicts);
+    vstring_free(keybuf);
+
+    return (found);
+}
+
+/* postalias_query - query a map and print the result to stdout */
+
+static int postalias_query(const char *map_type, const char *map_name,
+			           const char *key, int dict_flags)
+{
+    DICT   *dict;
+    const char *value;
+
+    dict = dict_open3(map_type, map_name, O_RDONLY, dict_flags);
+    if ((value = dict_get(dict, key)) != 0) {
+	if (*value == 0) {
+	    msg_warn("table %s:%s: key %s: empty string result is not allowed",
+		     map_type, map_name, key);
+	    msg_warn("table %s:%s should return NO RESULT in case of NOT FOUND",
+		     map_type, map_name);
+	}
+	vstream_printf("%s\n", value);
+    }
+    if (dict->error)
+	msg_fatal("table %s:%s: query error: %m", dict->type, dict->name);
+    vstream_fflush(VSTREAM_OUT);
+    dict_close(dict);
+    return (value != 0);
+}
+
+/* postalias_deletes - apply multiple requests from stdin */
+
+static int postalias_deletes(VSTREAM *in, char **maps, const int map_count,
+			             int dict_flags)
+{
+    int     found = 0;
+    VSTRING *keybuf = vstring_alloc(100);
+    DICT  **dicts;
+    const char *map_name;
+    int     n;
+    int     open_flags;
+
+    /*
+     * Sanity check.
+     */
+    if (map_count <= 0)
+	msg_panic("postalias_deletes: bad map count");
+
+    /*
+     * Open maps ahead of time.
+     */
+    dicts = (DICT **) mymalloc(sizeof(*dicts) * map_count);
+    for (n = 0; n < map_count; n++) {
+	map_name = split_at(maps[n], ':');
+	if (map_name && strcmp(maps[n], DICT_TYPE_PROXY) == 0)
+	    open_flags = O_RDWR | O_CREAT;	/* XXX */
+	else
+	    open_flags = O_RDWR;
+	dicts[n] = (map_name != 0 ?
+		    dict_open3(maps[n], map_name, open_flags, dict_flags) :
+		  dict_open3(var_db_type, maps[n], open_flags, dict_flags));
+    }
+
+    /*
+     * Perform all requests.
+     */
+    while (vstring_get_nonl(keybuf, in) != VSTREAM_EOF) {
+	for (n = 0; n < map_count; n++) {
+	    found |= (dict_del(dicts[n], STR(keybuf)) == 0);
+	    if (dicts[n]->error)
+		msg_fatal("table %s:%s: delete error: %m",
+			  dicts[n]->type, dicts[n]->name);
+	}
+    }
+
+    /*
+     * Cleanup.
+     */
+    for (n = 0; n < map_count; n++)
+	if (dicts[n])
+	    dict_close(dicts[n]);
+    myfree((void *) dicts);
+    vstring_free(keybuf);
+
+    return (found);
+}
+
+/* postalias_delete - delete a key value pair from a map */
+
+static int postalias_delete(const char *map_type, const char *map_name,
+			            const char *key, int dict_flags)
+{
+    DICT   *dict;
+    int     status;
+    int     open_flags;
+
+    if (strcmp(map_type, DICT_TYPE_PROXY) == 0)
+	open_flags = O_RDWR | O_CREAT;		/* XXX */
+    else
+	open_flags = O_RDWR;
+    dict = dict_open3(map_type, map_name, open_flags, dict_flags);
+    status = dict_del(dict, key);
+    if (dict->error)
+	msg_fatal("table %s:%s: delete error: %m", dict->type, dict->name);
+    dict_close(dict);
+    return (status == 0);
+}
+
+/* postalias_seq - print all map entries to stdout */
+
+static void postalias_seq(const char *map_type, const char *map_name,
+			          int dict_flags)
+{
+    DICT   *dict;
+    const char *key;
+    const char *value;
+    int     func;
+
+    if (strcmp(map_type, DICT_TYPE_PROXY) == 0)
+	msg_fatal("can't sequence maps via the proxy service");
+    dict = dict_open3(map_type, map_name, O_RDONLY, dict_flags);
+    for (func = DICT_SEQ_FUN_FIRST; /* void */ ; func = DICT_SEQ_FUN_NEXT) {
+	if (dict_seq(dict, func, &key, &value) != 0)
+	    break;
+	if (*key == 0) {
+	    msg_warn("table %s:%s: empty lookup key value is not allowed",
+		     map_type, map_name);
+	} else if (*value == 0) {
+	    msg_warn("table %s:%s: key %s: empty string result is not allowed",
+		     map_type, map_name, key);
+	    msg_warn("table %s:%s should return NO RESULT in case of NOT FOUND",
+		     map_type, map_name);
+	}
+	vstream_printf("%s:	%s\n", key, value);
+    }
+    if (dict->error)
+	msg_fatal("table %s:%s: sequence error: %m", dict->type, dict->name);
+    vstream_fflush(VSTREAM_OUT);
+    dict_close(dict);
+}
+
+/* usage - explain */
+
+static NORETURN usage(char *myname)
+{
+    msg_fatal("usage: %s [-Nfinoprsuvw] [-c config_dir] [-d key] [-q key] [map_type:]file...",
+	      myname);
+}
+
+MAIL_VERSION_STAMP_DECLARE;
+
+int     main(int argc, char **argv)
+{
+    char   *path_name;
+    int     ch;
+    int     fd;
+    char   *slash;
+    struct stat st;
+    int     postalias_flags = POSTALIAS_FLAG_AS_OWNER | POSTALIAS_FLAG_SAVE_PERM;
+    int     open_flags = O_RDWR | O_CREAT | O_TRUNC;
+    int     dict_flags = (DICT_FLAG_DUP_WARN | DICT_FLAG_FOLD_FIX
+			  | DICT_FLAG_UTF8_REQUEST);
+    char   *query = 0;
+    char   *delkey = 0;
+    int     sequence = 0;
+    int     found;
+    ARGV   *import_env;
+
+    /*
+     * Fingerprint executables and core dumps.
+     */
+    MAIL_VERSION_STAMP_ALLOCATE;
+
+    /*
+     * Be consistent with file permissions.
+     */
+    umask(022);
+
+    /*
+     * To minimize confusion, make sure that the standard file descriptors
+     * are open before opening anything else. XXX Work around for 44BSD where
+     * fstat can return EBADF on an open file descriptor.
+     */
+    for (fd = 0; fd < 3; fd++)
+	if (fstat(fd, &st) == -1
+	    && (close(fd), open("/dev/null", O_RDWR, 0)) != fd)
+	    msg_fatal("open /dev/null: %m");
+
+    /*
+     * Process environment options as early as we can. We are not set-uid,
+     * and we are supposed to be running in a controlled environment.
+     */
+    if (getenv(CONF_ENV_VERB))
+	msg_verbose = 1;
+
+    /*
+     * Initialize. Set up logging. Read the global configuration file after
+     * parsing command-line arguments.
+     */
+    if ((slash = strrchr(argv[0], '/')) != 0 && slash[1])
+	argv[0] = slash + 1;
+    msg_vstream_init(argv[0], VSTREAM_ERR);
+    maillog_client_init(mail_task(argv[0]), MAILLOG_CLIENT_FLAG_NONE);
+
+    /*
+     * Check the Postfix library version as soon as we enable logging.
+     */
+    MAIL_VERSION_CHECK;
+
+    /*
+     * Parse JCL.
+     */
+    while ((ch = GETOPT(argc, argv, "Nc:d:finopq:rsuvw")) > 0) {
+	switch (ch) {
+	default:
+	    usage(argv[0]);
+	    break;
+	case 'N':
+	    dict_flags |= DICT_FLAG_TRY1NULL;
+	    dict_flags &= ~DICT_FLAG_TRY0NULL;
+	    break;
+	case 'c':
+	    if (setenv(CONF_ENV_PATH, optarg, 1) < 0)
+		msg_fatal("out of memory");
+	    break;
+	case 'd':
+	    if (sequence || query || delkey)
+		msg_fatal("specify only one of -s -q or -d");
+	    delkey = optarg;
+	    break;
+	case 'f':
+	    dict_flags &= ~DICT_FLAG_FOLD_FIX;
+	    break;
+	case 'i':
+	    open_flags &= ~O_TRUNC;
+	    break;
+	case 'n':
+	    dict_flags |= DICT_FLAG_TRY0NULL;
+	    dict_flags &= ~DICT_FLAG_TRY1NULL;
+	    break;
+	case 'o':
+	    postalias_flags &= ~POSTALIAS_FLAG_AS_OWNER;
+	    break;
+	case 'p':
+	    postalias_flags &= ~POSTALIAS_FLAG_SAVE_PERM;
+	    break;
+	case 'q':
+	    if (sequence || query || delkey)
+		msg_fatal("specify only one of -s -q or -d");
+	    query = optarg;
+	    break;
+	case 'r':
+	    dict_flags &= ~(DICT_FLAG_DUP_WARN | DICT_FLAG_DUP_IGNORE);
+	    dict_flags |= DICT_FLAG_DUP_REPLACE;
+	    break;
+	case 's':
+	    if (query || delkey)
+		msg_fatal("specify only one of -s or -q or -d");
+	    sequence = 1;
+	    break;
+	case 'u':
+	    dict_flags &= ~DICT_FLAG_UTF8_REQUEST;
+	    break;
+	case 'v':
+	    msg_verbose++;
+	    break;
+	case 'w':
+	    dict_flags &= ~(DICT_FLAG_DUP_WARN | DICT_FLAG_DUP_REPLACE);
+	    dict_flags |= DICT_FLAG_DUP_IGNORE;
+	    break;
+	}
+    }
+    mail_conf_read();
+    /* Enforce consistent operation of different Postfix parts. */
+    import_env = mail_parm_split(VAR_IMPORT_ENVIRON, var_import_environ);
+    update_env(import_env->argv);
+    argv_free(import_env);
+    /* Re-evaluate mail_task() after reading main.cf. */
+    maillog_client_init(mail_task(argv[0]), MAILLOG_CLIENT_FLAG_NONE);
+    mail_dict_init();
+
+    /*
+     * Use the map type specified by the user, or fall back to a default
+     * database type.
+     */
+    if (delkey) {				/* remove entry */
+	if (optind + 1 > argc)
+	    usage(argv[0]);
+	if (strcmp(delkey, "-") == 0)
+	    exit(postalias_deletes(VSTREAM_IN, argv + optind, argc - optind,
+				   dict_flags | DICT_FLAG_LOCK) == 0);
+	found = 0;
+	while (optind < argc) {
+	    if ((path_name = split_at(argv[optind], ':')) != 0) {
+		found |= postalias_delete(argv[optind], path_name, delkey,
+					  dict_flags | DICT_FLAG_LOCK);
+	    } else {
+		found |= postalias_delete(var_db_type, argv[optind], delkey,
+					  dict_flags | DICT_FLAG_LOCK);
+	    }
+	    optind++;
+	}
+	exit(found ? 0 : 1);
+    } else if (query) {				/* query map(s) */
+	if (optind + 1 > argc)
+	    usage(argv[0]);
+	if (strcmp(query, "-") == 0)
+	    exit(postalias_queries(VSTREAM_IN, argv + optind, argc - optind,
+				   dict_flags | DICT_FLAG_LOCK) == 0);
+	while (optind < argc) {
+	    if ((path_name = split_at(argv[optind], ':')) != 0) {
+		found = postalias_query(argv[optind], path_name, query,
+					dict_flags | DICT_FLAG_LOCK);
+	    } else {
+		found = postalias_query(var_db_type, argv[optind], query,
+					dict_flags | DICT_FLAG_LOCK);
+	    }
+	    if (found)
+		exit(0);
+	    optind++;
+	}
+	exit(1);
+    } else if (sequence) {
+	while (optind < argc) {
+	    if ((path_name = split_at(argv[optind], ':')) != 0) {
+		postalias_seq(argv[optind], path_name,
+			      dict_flags | DICT_FLAG_LOCK);
+	    } else {
+		postalias_seq(var_db_type, argv[optind],
+			      dict_flags | DICT_FLAG_LOCK);
+	    }
+	    exit(0);
+	}
+	exit(1);
+    } else {					/* create/update map(s) */
+	if (optind + 1 > argc)
+	    usage(argv[0]);
+	while (optind < argc) {
+	    if ((path_name = split_at(argv[optind], ':')) != 0) {
+		postalias(argv[optind], path_name, postalias_flags,
+			  open_flags, dict_flags);
+	    } else {
+		postalias(var_db_type, argv[optind], postalias_flags,
+			  open_flags, dict_flags);
+	    }
+	    optind++;
+	}
+	exit(0);
+    }
+}