postmap.c

[詳解]

/*++
/* NAME
/*  postmap 1
/* SUMMARY
/*  Postfix lookup table management
/* SYNOPSIS
/* .fi
/*  \fBpostmap\fR [\fB-NbfhimnoprsuUvw\fR] [\fB-c \fIconfig_dir\fR]
/*  [\fB-d \fIkey\fR] [\fB-q \fIkey\fR]
/*      [\fIfile_type\fR:]\fIfile_name\fR ...
/* DESCRIPTION
/*  The \fBpostmap\fR(1) command creates or queries one or more Postfix
/*  lookup tables, or updates an existing one. The input and output
/*  file formats are expected to be compatible with:
/*
/* .nf
/*      \fBmakemap \fIfile_type\fR \fIfile_name\fR < \fIfile_name\fR
/* .fi
/*
/*  If the result files do not exist they will be created with the
/*  same group and other read permissions as their source file.
/*
/*  While the table update is in progress, signal delivery is
/*  postponed, and an exclusive, advisory, lock is placed on the
/*  entire table, in order to avoid surprises in spectator
/*  processes.
/* INPUT FILE FORMAT
/* .ad
/* .fi
/*  The format of a lookup table input file is as follows:
/* .IP \(bu
/*  A table entry has the form
/* .sp
/* .nf
/*       \fIkey\fR whitespace \fIvalue\fR
/* .fi
/* .IP \(bu
/*  Empty lines and whitespace-only lines are ignored, as
/*  are lines whose first non-whitespace character is a `#'.
/* .IP \(bu
/*  A logical line starts with non-whitespace text. A line that
/*  starts with whitespace continues a logical line.
/* .PP
/*  The \fIkey\fR and \fIvalue\fR are processed as is, except that
/*  surrounding white space is stripped off. Whitespace in lookup
/*  keys is supported as of Postfix 3.2.
/*
/*  When the \fIkey\fR specifies email address information, the
/*  localpart should be enclosed with double quotes if required
/*  by RFC 5322. For example, an address localpart that contains
/*  ";", or a localpart that starts or ends with ".".
/*
/*  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.
/* COMMAND-LINE ARGUMENTS
/* .ad
/* .fi
/* .IP \fB-b\fR
/*  Enable message body query mode. When reading lookup keys
/*  from standard input with "\fB-q -\fR", process the input
/*  as if it is an email message in RFC 5322 format.  Each line
/*  of body content becomes one lookup key.
/* .sp
/*  By default, the \fB-b\fR option starts generating lookup
/*  keys at the first non-header line, and stops when the end
/*  of the message is reached.
/*  To simulate \fBbody_checks\fR(5) processing, enable MIME
/*  parsing with \fB-m\fR. With this, the \fB-b\fR option
/*  generates no body-style lookup keys for attachment MIME
/*  headers and for attached message/* headers.
/* .sp
/*  NOTE: with "smtputf8_enable = yes", the \fB-b\fR option
/*  option disables UTF-8 syntax checks on query keys and
/*  lookup results. Specify the \fB-U\fR option to force UTF-8
/*  syntax checks anyway.
/* .sp
/*  This feature is available in Postfix version 2.6 and later.
/* .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-h\fR
/*  Enable message header query mode. When reading lookup keys
/*  from standard input with "\fB-q -\fR", process the input
/*  as if it is an email message in RFC 5322 format.  Each
/*  logical header line becomes one lookup key. A multi-line
/*  header becomes one lookup key with one or more embedded
/*  newline characters.
/* .sp
/*  By default, the \fB-h\fR option generates lookup keys until
/*  the first non-header line is reached.
/*  To simulate \fBheader_checks\fR(5) processing, enable MIME
/*  parsing with \fB-m\fR. With this, the \fB-h\fR option also
/*  generates header-style lookup keys for attachment MIME
/*  headers and for attached message/* headers.
/* .sp
/*  NOTE: with "smtputf8_enable = yes", the \fB-b\fR option
/*  option disables UTF-8 syntax checks on query keys and
/*  lookup results. Specify the \fB-U\fR option to force UTF-8
/*  syntax checks anyway.
/* .sp
/*  This feature is available in Postfix version 2.6 and later.
/* .IP \fB-i\fR
/*  Incremental mode. Read entries from standard input and do not
/*  truncate an existing database. By default, \fBpostmap\fR(1) creates
/*  a new database from the entries in \fBfile_name\fR.
/* .IP \fB-m\fR
/*  Enable MIME parsing with "\fB-b\fR" and "\fB-h\fR".
/* .sp
/*  This feature is available in Postfix version 2.6 and later.
/* .IP \fB-N\fR
/*  Include the terminating null character that terminates lookup keys
/*  and values. By default, \fBpostmap\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, \fBpostmap\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, \fBpostmap\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.
/*
/*  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.
/* .sp
/*  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-U\fR
/*  With "smtputf8_enable = yes", force UTF-8 syntax checks
/*  with the \fB-b\fR and \fB-h\fR options.
/* .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 \fBpostmap\fR(1) command can query any supported file type,
/*  but it can create only the following file types:
/* .RS
/* .IP \fBbtree\fR
/*  The output file 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 consists of 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 \fBhash\fR
/*  The output file is a hashed file, named \fIfile_name\fB.db\fR.
/*  This is available on systems with support for \fBdb\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 \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.
/* .RE
/* .IP \fIfile_name\fR
/*  The name of the lookup table source file when rebuilding a database.
/* DIAGNOSTICS
/*  Problems are logged to the standard error stream and to
/*  \fBsyslogd\fR(8).
/*  No output means that no problems were detected. Duplicate entries are
/*  skipped and are flagged with a warning.
/*
/*  \fBpostmap\fR(1) terminates with zero exit status in case of success
/*  (including successful "\fBpostmap -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 "\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 "\fBconfig_directory (see 'postconf -d' output)\fR"
/*  The default location of the Postfix main.cf and master.cf
/*  configuration files.
/* .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 parameters 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..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".
/* SEE ALSO
/*  postalias(1), create/update/query alias database
/*  postconf(1), supported database types
/*  postconf(5), configuration parameters
/*  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 <msg_syslog.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 <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 <mime_state.h>
#include <rec_type.h>
#include <mail_parm_split.h>

/* Application-specific. */

#define STR vstring_str
#define LEN VSTRING_LEN

#define POSTMAP_FLAG_AS_OWNER   (1<<0)  /* open dest as owner of source */
#define POSTMAP_FLAG_SAVE_PERM  (1<<1)  /* copy access permission from source */
#define POSTMAP_FLAG_HEADER_KEY (1<<2)  /* apply to header text */
#define POSTMAP_FLAG_BODY_KEY   (1<<3)  /* apply to body text */
#define POSTMAP_FLAG_MIME_KEY   (1<<4)  /* enable MIME parsing */

#define POSTMAP_FLAG_HB_KEY (POSTMAP_FLAG_HEADER_KEY | POSTMAP_FLAG_BODY_KEY)
#define POSTMAP_FLAG_FULL_KEY (POSTMAP_FLAG_BODY_KEY | POSTMAP_FLAG_MIME_KEY)
#define POSTMAP_FLAG_ANY_KEY (POSTMAP_FLAG_HB_KEY | POSTMAP_FLAG_MIME_KEY)

 /*
  * MIME Engine call-back state for generating lookup keys from an email
  * message read from standard input.
  */
typedef struct {
    DICT  **dicts;          /* map handles */
    char  **maps;           /* map names */
    int     map_count;          /* yes, indeed */
    int     dict_flags;         /* query flags */
    int     header_done;        /* past primary header */
    int     found;          /* result */
} POSTMAP_KEY_STATE;

/* postmap - create or update mapping database */

static void postmap(char *map_type, char *path_name, int postmap_flags,
                    int open_flags, int dict_flags)
{
    VSTREAM *NOCLOBBER source_fp;
    VSTRING *line_buffer;
    MKMAP  *mkmap;
    int     lineno;
    int     last_line;
    char   *key;
    char   *value;
    struct stat st;
    mode_t  saved_mask;

    /*
     * Initialize.
     */
    line_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 ((postmap_flags & POSTMAP_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 postmap does not
     * allow privilege escalation.
     */
    if ((postmap_flags & POSTMAP_FLAG_AS_OWNER) && getuid() == 0
    && (st.st_uid != geteuid() || st.st_gid != getegid()))
    set_eugid(st.st_uid, st.st_gid);

    /*
     * Open the database, optionally create it when it does not exist,
     * optionally 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 ((postmap_flags & POSTMAP_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. XXX This duplicates the parser in
     * dict_thash.c.
     */
    last_line = 0;
    while (readllines(line_buffer, source_fp, &last_line, &lineno)) {
        int     in_quotes = 0;

        /*
         * 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;
        }

        /*
         * Terminate the key on the first unquoted whitespace character,
         * then trim leading and trailing whitespace from the value.
         */
        for (value = STR(line_buffer); *value; value++) {
        if (*value == '\\') {
            if (*++value == 0)
            break;
        } else if (ISSPACE(*value)) {
            if (!in_quotes)
            break;
        } else if (*value == '"') {
            in_quotes = !in_quotes;
        }
        }
        if (in_quotes) {
        msg_warn("%s, line %d: unbalanced '\"' in '%s'"
             " -- ignoring this line",
             VSTREAM_PATH(source_fp), lineno, STR(line_buffer));
        continue;
        }
        if (*value)
        *value++ = 0;
        while (ISSPACE(*value))
        value++;
        trimblanks(value, 0)[0] = 0;

        /*
         * Leave the key in quoted form, because 1) postmap cannot assume
         * that a string without @ contains an email address localpart,
         * and 2) an address localpart may require quoting even when the
         * quoted form contains no backslash or ".
         */
        key = STR(line_buffer);

        /*
         * Enforce the "key whitespace value" format. Disallow missing
         * keys or missing values.
         */
        if (*key == 0 || *value == 0) {
        msg_warn("%s, line %d: expected format: key whitespace value",
             VSTREAM_PATH(source_fp), lineno);
        continue;
        }
        if (key[strlen(key) - 1] == ':')
        msg_warn("%s, line %d: record is in \"key: value\" format; is this an alias file?",
             VSTREAM_PATH(source_fp), lineno);

        /*
         * Store the value under a (possibly case-insensitive) key, as
         * specified with open_flags.
         */
        mkmap_append(mkmap, key, value);
        if (mkmap->dict->error)
        msg_fatal("table %s:%s: write error: %m",
              mkmap->dict->type, mkmap->dict->name);
    }
    break;
    }

    /*
     * Close the mapping database, and release the lock.
     */
    mkmap_close(mkmap);

    /*
     * Cleanup. We're about to terminate, but it is a good sanity check.
     */
    vstring_free(line_buffer);
    if (source_fp != VSTREAM_IN)
    vstream_fclose(source_fp);
}

/* postmap_body - MIME engine body call-back routine */

static void postmap_body(void *ptr, int unused_rec_type,
                     const char *keybuf,
                     ssize_t unused_len,
                     off_t unused_offset)
{
    POSTMAP_KEY_STATE *state = (POSTMAP_KEY_STATE *) ptr;
    DICT  **dicts = state->dicts;
    char  **maps = state->maps;
    int     map_count = state->map_count;
    int     dict_flags = state->dict_flags;
    const char *map_name;
    const char *value;
    int     n;

    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], keybuf)) != 0) {
        if (*value == 0) {
        msg_warn("table %s:%s: key %s: empty string result is not allowed",
             dicts[n]->type, dicts[n]->name, 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", keybuf, value);
        state->found = 1;
        break;
    }
    if (dicts[n]->error)
        msg_fatal("table %s:%s: query error: %m",
              dicts[n]->type, dicts[n]->name);
    }
}

/* postmap_header - MIME engine header call-back routine */

static void postmap_header(void *ptr, int unused_header_class,
                       const HEADER_OPTS *unused_header_info,
                       VSTRING *header_buf,
                       off_t offset)
{

    /*
     * Don't re-invent an already working wheel.
     */
    postmap_body(ptr, 0, STR(header_buf), LEN(header_buf), offset);
}

/* postmap_head_end - MIME engine end-of-header call-back routine */

static void postmap_head_end(void *ptr)
{
    POSTMAP_KEY_STATE *state = (POSTMAP_KEY_STATE *) ptr;

    /*
     * Don't process the message body when we only examine primary headers.
     */
    state->header_done = 1;
}

/* postmap_queries - apply multiple requests from stdin */

static int postmap_queries(VSTREAM *in, char **maps, const int map_count,
                       const int postmap_flags,
                       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("postmap_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.
     */
    if ((postmap_flags & POSTMAP_FLAG_HB_KEY) == 0) {
    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);
        }
    }
    } else {
    POSTMAP_KEY_STATE key_state;
    MIME_STATE *mime_state;
    int     mime_errs = 0;

    /*
     * Bundle up the request and instantiate a MIME parsing engine.
     */
    key_state.dicts = dicts;
    key_state.maps = maps;
    key_state.map_count = map_count;
    key_state.dict_flags = dict_flags;
    key_state.header_done = 0;
    key_state.found = 0;
    mime_state =
        mime_state_alloc((postmap_flags & POSTMAP_FLAG_MIME_KEY) ?
                 0 : MIME_OPT_DISABLE_MIME,
                 (postmap_flags & POSTMAP_FLAG_HEADER_KEY) ?
                 postmap_header : (MIME_STATE_HEAD_OUT) 0,
                 (postmap_flags & POSTMAP_FLAG_FULL_KEY) ?
                 (MIME_STATE_ANY_END) 0 : postmap_head_end,
                 (postmap_flags & POSTMAP_FLAG_BODY_KEY) ?
                 postmap_body : (MIME_STATE_BODY_OUT) 0,
                 (MIME_STATE_ANY_END) 0,
                 (MIME_STATE_ERR_PRINT) 0,
                 (void *) &key_state);

    /*
     * Process the input message.
     */
    while (vstring_get_nonl(keybuf, in) != VSTREAM_EOF
           && key_state.header_done == 0 && mime_errs == 0)
        mime_errs = mime_state_update(mime_state, REC_TYPE_NORM,
                      STR(keybuf), LEN(keybuf));

    /*
     * Flush the MIME engine output buffer and tidy up loose ends.
     */
    if (mime_errs == 0)
        mime_errs = mime_state_update(mime_state, REC_TYPE_END, "", 0);
    if (mime_errs)
        msg_fatal("message format error: %s",
              mime_state_detail(mime_errs)->text);
    mime_state_free(mime_state);
    found = key_state.found;
    }
    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);
}

/* postmap_query - query a map and print the result to stdout */

static int postmap_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);
}

/* postmap_deletes - apply multiple requests from stdin */

static int postmap_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("postmap_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);
}

/* postmap_delete - delete a (key, value) pair from a map */

static int postmap_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);
}

/* postmap_seq - print all map entries to stdout */

static void postmap_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 [-NfinoprsuUvw] [-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     postmap_flags = POSTMAP_FLAG_AS_OWNER | POSTMAP_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;
    int     force_utf8 = 0;
    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 and
     * extract configuration information.
     */
    if ((slash = strrchr(argv[0], '/')) != 0 && slash[1])
    argv[0] = slash + 1;
    msg_vstream_init(argv[0], VSTREAM_ERR);
    msg_syslog_init(mail_task(argv[0]), LOG_PID, LOG_FACILITY);

    /*
     * Check the Postfix library version as soon as we enable logging.
     */
    MAIL_VERSION_CHECK;

    /*
     * Parse JCL.
     */
    while ((ch = GETOPT(argc, argv, "Nbc:d:fhimnopq:rsuUvw")) > 0) {
    switch (ch) {
    default:
        usage(argv[0]);
        break;
    case 'N':
        dict_flags |= DICT_FLAG_TRY1NULL;
        dict_flags &= ~DICT_FLAG_TRY0NULL;
        break;
    case 'b':
        postmap_flags |= POSTMAP_FLAG_BODY_KEY;
        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 'h':
        postmap_flags |= POSTMAP_FLAG_HEADER_KEY;
        break;
    case 'i':
        open_flags &= ~O_TRUNC;
        break;
    case 'm':
        postmap_flags |= POSTMAP_FLAG_MIME_KEY;
        break;
    case 'n':
        dict_flags |= DICT_FLAG_TRY0NULL;
        dict_flags &= ~DICT_FLAG_TRY1NULL;
        break;
    case 'o':
        postmap_flags &= ~POSTMAP_FLAG_AS_OWNER;
        break;
    case 'p':
        postmap_flags &= ~POSTMAP_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 'U':
        force_utf8 = 1;
        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. */
    msg_syslog_init(mail_task(argv[0]), LOG_PID, LOG_FACILITY);
    mail_dict_init();
    if ((query == 0 || strcmp(query, "-") != 0)
    && (postmap_flags & POSTMAP_FLAG_ANY_KEY))
    msg_fatal("specify -b -h or -m only with \"-q -\"");
    if ((postmap_flags & POSTMAP_FLAG_ANY_KEY) != 0
    && (postmap_flags & POSTMAP_FLAG_ANY_KEY)
    == (postmap_flags & POSTMAP_FLAG_MIME_KEY))
    msg_warn("ignoring -m option without -b or -h");
    if ((postmap_flags & (POSTMAP_FLAG_ANY_KEY & ~POSTMAP_FLAG_MIME_KEY))
    && force_utf8 == 0)
    dict_flags &= ~DICT_FLAG_UTF8_MASK;

    /*
     * 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(postmap_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 |= postmap_delete(argv[optind], path_name, delkey,
                    dict_flags | DICT_FLAG_LOCK);
        } else {
        found |= postmap_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(postmap_queries(VSTREAM_IN, argv + optind, argc - optind,
              postmap_flags, dict_flags | DICT_FLAG_LOCK) == 0);
    while (optind < argc) {
        if ((path_name = split_at(argv[optind], ':')) != 0) {
        found = postmap_query(argv[optind], path_name, query,
                      dict_flags | DICT_FLAG_LOCK);
        } else {
        found = postmap_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) {
        postmap_seq(argv[optind], path_name,
                dict_flags | DICT_FLAG_LOCK);
        } else {
        postmap_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) {
        postmap(argv[optind], path_name, postmap_flags,
            open_flags, dict_flags);
        } else {
        postmap(var_db_type, argv[optind], postmap_flags,
            open_flags, dict_flags);
        }
        optind++;
    }
    exit(0);
    }
}