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|
/*++
/* NAME
/* postalias 1
/* SUMMARY
/* Postfix alias database maintenance
/* SYNOPSIS
/* .fi
/* \fBpostalias\fR [\fB-Nfinorvw\fR] [\fB-c \fIconfig_dir\fR]
/* [\fB-d \fIkey\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.
/*
/* If the result files do not exist they will be created with the
/* same group and other read permissions as the 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
/* 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
/* 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 map.
/* .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 \fIfile_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-o\fR
/* Do not release root privileges when processing a non-root
/* input file. By default, \fBpostalias\fR drops root privileges
/* and runs as the source file owner instead.
/* .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 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 and prints 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 warn about duplicate entries; silently
/* replace them.
/* .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 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
/* Use the command \fBpostconf -m\fR to find out what types of database
/* your Postfix installation can support.
/*
/* 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. No output means
/* no problems were detected. Duplicate entries are skipped and are
/* flagged with a warning.
/*
/* \fBpostalias\fR 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. See the Postfix \fBmain.cf\fR file for syntax details
/* and for default values.
/* .IP \fBdefault_database_type\fR
/* Default database type. On many UNIX systems, the default type
/* is either \fBdbm\fR or \fBhash\fR.
/* .IP \fBberkeley_db_create_buffer_size\fR
/* Amount of buffer memory to be used when creating a Berkeley DB
/* \fBhash\fR or \fBbtree\fR lookup table.
/* .IP \fBberkeley_db_read_buffer_size\fR
/* Amount of buffer memory to be used when reading a Berkeley DB
/* \fBhash\fR or \fBbtree\fR lookup table.
/* 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 <vstring_vstream.h>
#include <set_eugid.h>
/* Global library. */
#include <tok822.h>
#include <mail_conf.h>
#include <mail_dict.h>
#include <mail_params.h>
#include <mkmap.h>
/* Application-specific. */
#define STR vstring_str
#define POSTALIAS_FLAG_AS_OWNER (1<<0) /* open dest as owner of 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 *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;
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) {
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);
}
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 (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 (S_ISREG(st.st_mode))
umask(saved_mask);
/*
* Add records to the database.
*/
lineno = 0;
while (readlline(line_buffer, source_fp, &lineno)) {
/*
* 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.
*/
if (dict_flags & DICT_FLAG_FOLD_KEY)
lowercase(STR(key_buffer));
mkmap_append(mkmap, STR(key_buffer), STR(value_buffer));
}
/*
* 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, "@", "@");
/*
* 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_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 unecessary
* maps.
*/
while (vstring_get_nonl(keybuf, in) != VSTREAM_EOF) {
if (dict_flags & DICT_FLAG_FOLD_KEY)
lowercase(STR(keybuf));
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_FLAG_LOCK) :
dict_open3(var_db_type, maps[n], O_RDONLY, DICT_FLAG_LOCK));
if ((value = dict_get(dicts[n], STR(keybuf))) != 0) {
vstream_printf("%s: %s\n", STR(keybuf), value);
found = 1;
break;
}
}
}
if (found)
vstream_fflush(VSTREAM_OUT);
/*
* Cleanup.
*/
for (n = 0; n < map_count; n++)
if (dicts[n])
dict_close(dicts[n]);
myfree((char *) 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)
{
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);
}
/* postalias_deletes - apply multiple requests from stdin */
static int postalias_deletes(VSTREAM *in, char **maps, const int map_count)
{
int found = 0;
VSTRING *keybuf = vstring_alloc(100);
DICT **dicts;
const char *map_name;
int n;
/*
* 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++)
dicts[n] = ((map_name = split_at(maps[n], ':')) != 0 ?
dict_open3(maps[n], map_name, O_RDWR, DICT_FLAG_LOCK) :
dict_open3(var_db_type, maps[n], O_RDWR, DICT_FLAG_LOCK));
/*
* 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);
/*
* Cleanup.
*/
for (n = 0; n < map_count; n++)
if (dicts[n])
dict_close(dicts[n]);
myfree((char *) 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)
{
DICT *dict;
int status;
dict = dict_open3(map_type, map_name, O_RDWR, DICT_FLAG_LOCK);
status = dict_del(dict, key);
dict_close(dict);
return (status == 0);
}
/* usage - explain */
static NORETURN usage(char *myname)
{
msg_fatal("usage: %s [-Nfinorvw] [-c config_dir] [-d key] [-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 postalias_flags = POSTALIAS_FLAG_AS_OWNER;
int open_flags = O_RDWR | O_CREAT | O_TRUNC;
int dict_flags = DICT_FLAG_DUP_WARN | DICT_FLAG_FOLD_KEY;
char *query = 0;
char *delkey = 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:d:finoq:rvw")) > 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 (query || delkey)
msg_fatal("specify only one of -q or -d");
delkey = optarg;
break;
case 'f':
dict_flags &= ~DICT_FLAG_FOLD_KEY;
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 'q':
if (query || delkey)
msg_fatal("specify only one of -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 '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();
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) == 0);
found = 0;
while (optind < argc) {
if ((path_name = split_at(argv[optind], ':')) != 0) {
found |= postalias_delete(argv[optind], path_name, delkey);
} else {
found |= postalias_delete(var_db_type, argv[optind], delkey);
}
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) == 0);
if (dict_flags & DICT_FLAG_FOLD_KEY)
lowercase(query);
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);
} 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);
}
}
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