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/*++
/* NAME
/* postalias 1
/* SUMMARY
/* Postfix alias database maintenance
/* SYNOPSIS
/* .fi
/* \fBpostalias\fR [\fB-Ninvw\fR] [\fB-c \fIconfig_dir\fR]
/* [\fB-q \fIkey\fR] [\fIfile_type\fR:]\fIfile_name\fR ...
/* DESCRIPTION
/* The \fBpostalias\fR 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 the use as NIS alias maps.
/*
/* 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
/* programs.
/*
/* Options:
/* .IP \fB-N\fR
/* Include the terminating null character that terminates lookup keys
/* and values. By default, Postfix does whatever is the default for
/* the host operating system.
/* .IP "\fB-c \fIconfig_dir\fR"
/* Read the \fBmain.cf\fR configuration file in the named directory.
/* .IP \fB-i\fR
/* Incremental mode. Read entries from standard input and do not
/* truncate an existing database. By default, \fBpostalias\fR creates
/* a new database from the entries in \fBfile_name\fR.
/* .IP \fB-n\fR
/* Don't include the terminating null character that terminates lookup
/* keys and values. By default, Postfix does whatever is the default for
/* the host operating system.
/* .IP "\fB-q \fIkey\fR"
/* Search the specified maps for \fIkey\fR and print the first value
/* found on the standard output stream. The exit status is non-zero
/* if the requested information was not found.
/* .IP \fB-v\fR
/* Enable verbose logging for debugging purposes. Multiple \fB-v\fR
/* options make the software increasingly verbose.
/* .IP \fB-w\fR
/* Do not warn about duplicate entries; silently ignore them.
/* .PP
/* Arguments:
/* .IP \fIfile_type\fR
/* The type of database to be produced.
/* .RS
/* .IP \fBbtree\fR
/* The output is a btree file, named \fIfile_name\fB.db\fR.
/* This is available only on systems with support for \fBdb\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 only on systems with support for \fBdbm\fR databases.
/* .IP \fBhash\fR
/* The output is a hashed file, named \fIfile_name\fB.db\fR.
/* This is available only on systems with support for \fBdb\fR databases.
/* .PP
/* When no \fIfile_type\fR is specified, the software uses the database
/* type specified via the \fBdatabase_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 rebuilding a database.
/* DIAGNOSTICS
/* Problems are logged to the standard error stream. No output means
/* no problems were detected. Duplicate entries are skipped and are
/* flagged with a warning.
/* 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. See the Postfix \fBmain.cf\fR file for syntax details
/* and for default values.
/* .IP \fBdatabase_type\fR
/* Default alias database type. On many UNIX systems, the default type
/* is either \fBdbm\fR or \fBhash\fR.
/* STANDARDS
/* RFC 822 (ARPA Internet Text Messages)
/* SEE ALSO
/* aliases(5) format of alias database input file.
/* sendmail(1) mail posting and compatibility interface.
/* 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 <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 <get_hostname.h>
/* Global library. */
#include <tok822.h>
#include <mail_conf.h>
#include <mail_params.h>
#include <mkmap.h>
/* Application-specific. */
#define STR vstring_str
/* postalias - create or update alias database */
static void postalias(char *map_type, char *path_name,
int open_flags, int dict_flags)
{
VSTREAM *source_fp;
VSTRING *line_buffer;
MKMAP *mkmap;
int lineno;
VSTRING *key_buffer;
VSTRING *value_buffer;
TOK822 *tok_list;
TOK822 *key_list;
TOK822 *colon;
TOK822 *value_list;
/*
* Initialize.
*/
line_buffer = vstring_alloc(100);
key_buffer = vstring_alloc(100);
value_buffer = vstring_alloc(100);
if ((open_flags & O_TRUNC) == 0) {
source_fp = VSTREAM_IN;
vstream_control(source_fp, VSTREAM_CTL_PATH, "stdin", VSTREAM_CTL_END);
} else if ((source_fp = vstream_fopen(path_name, O_RDONLY, 0)) == 0) {
msg_fatal("open %s: %m", path_name);
}
/*
* 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);
/*
* Add records to the database.
*/
lineno = 0;
while (readlline(line_buffer, source_fp, &lineno, READLL_STRIPNL)) {
/*
* Skip comments.
*/
if (*STR(line_buffer) == '#')
continue;
/*
* Weird stuff. Normally, a line that begins with whitespace is a
* continuation of the previous line.
*/
if (ISSPACE(*STR(line_buffer))) {
msg_warn("%s, line %d: malformed line",
VSTREAM_PATH(source_fp), lineno);
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.
*/
lowercase(STR(key_buffer));
mkmap_append(mkmap, STR(key_buffer), STR(value_buffer));
}
/*
* Sendmail compatibility: add the @:@ signature to indicate that the
* database is complete. This might be needed by NIS clients running
* sendmail.
*/
mkmap_append(mkmap, "@", "@");
/*
* 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));
mkmap_append(mkmap, "YP_LAST_MODIFIED", STR(value_buffer));
mkmap_append(mkmap, "YP_MASTER_NAME", get_hostname());
/*
* 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_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)
{
DICT *dict;
const char *value;
dict = dict_open3(map_type, map_name, O_RDONLY, DICT_FLAG_LOCK);
if ((value = dict_get(dict, key)) != 0) {
vstream_printf("%s\n", value);
vstream_fflush(VSTREAM_OUT);
}
dict_close(dict);
return (value != 0);
}
/* usage - explain */
static NORETURN usage(char *myname)
{
msg_fatal("usage: %s [-Ninvw] [-c config_dir] [-q key] [map_type:]file...",
myname);
}
int main(int argc, char **argv)
{
char *path_name;
int ch;
int fd;
char *slash;
struct stat st;
int open_flags = O_RDWR | O_CREAT | O_TRUNC;
int dict_flags = DICT_FLAG_DUP_WARN;
char *query = 0;
int found;
/*
* 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 and
* extract configuration information.
*/
if ((slash = strrchr(argv[0], '/')) != 0)
argv[0] = slash + 1;
msg_vstream_init(argv[0], VSTREAM_ERR);
/*
* Parse JCL.
*/
while ((ch = GETOPT(argc, argv, "Nc:inq:vw")) > 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 'i':
open_flags &= ~O_TRUNC;
break;
case 'n':
dict_flags |= DICT_FLAG_TRY0NULL;
dict_flags &= ~DICT_FLAG_TRY1NULL;
break;
case 'q':
query = optarg;
break;
case 'v':
msg_verbose++;
break;
case 'w':
dict_flags &= ~DICT_FLAG_DUP_WARN;
dict_flags |= DICT_FLAG_DUP_IGNORE;
break;
}
}
mail_conf_read();
/*
* Use the map type specified by the user, or fall back to a default
* database type.
*/
if (query == 0) { /* 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, open_flags, dict_flags);
} else {
postalias(var_db_type, argv[optind], open_flags, dict_flags);
}
optind++;
}
exit(0);
} else { /* query map(s) */
if (optind + 1 > argc)
usage(argv[0]);
while (optind < argc) {
if ((path_name = split_at(argv[optind], ':')) != 0) {
found = postalias_query(argv[optind], path_name, query);
} else {
found = postalias_query(var_db_type, argv[optind], query);
}
if (found)
exit(0);
optind++;
}
exit(1);
}
}
|