Expand PMF_FN_* macros.

[netbsd-mini2440.git] / external / ibm-public / postfix / dist / src / global / db_common.c

/*      $NetBSD$        */

/*++
/* NAME
/*      db_common 3
/* SUMMARY
/*      utilities common to network based dictionaries
/* SYNOPSIS
/*      #include "db_common.h"
/*
/*      int     db_common_parse(dict, ctx, format, query)
/*      DICT    *dict;
/*      void    **ctx;
/*      const char *format;
/*      int     query;
/*
/*      void    db_common_free_context(ctx)
/*      void    *ctx;
/*
/*      int     db_common_expand(ctx, format, value, key, buf, quote_func);
/*      void    *ctx;
/*      const char *format;
/*      const char *value;
/*      const char *key;
/*      VSTRING *buf;
/*      void    (*quote_func)(DICT *, const char *, VSTRING *);
/*
/*      int     db_common_check_domain(domain_list, addr);
/*      STRING_LIST *domain_list;
/*      const char *addr;
/*
/*      void    db_common_sql_build_query(query,parser);
/*      VSTRING *query;
/*      CFG_PARSER *parser;
/*
/* DESCRIPTION
/*      This module implements utilities common to network based dictionaries.
/*
/*      \fIdb_common_parse\fR parses query and result substitution templates.
/*      It must be called for each template before any calls to
/*      \fIdb_common_expand\fR. The \fIctx\fB argument must be initialized to
/*      a reference to a (void *)0 before the first template is parsed, this
/*      causes memory for the context to be allocated and the new pointer is
/*      stored in *ctx. When the dictionary is closed, this memory must be
/*      freed with a final call to \fBdb_common_free_context\fR.
/*
/*      Calls for additional templates associated with the same map must use the
/*      same ctx argument. The context accumulates run-time lookup key and result
/*      validation information (inapplicable keys or results are skipped) and is
/*      needed later in each call of \fIdb_common_expand\fR. A non-zero return
/*      value indicates that data-depedent '%' expansions were found in the input
/*      template.
/*
/*      \fIdb_common_expand\fR expands the specifiers in \fIformat\fR.
/*      When the input data lacks all fields needed for the expansion, zero
/*      is returned and the query or result should be skipped. Otherwise
/*      the expansion is appended to the result buffer (after a comma if the
/*      the result buffer is not empty).
/*
/*      If not NULL, the \fBquote_func\fR callback performs database-specific
/*      quoting of each variable before expansion.
/*      \fBvalue\fR is the lookup key for query expansion and result for result
/*      expansion. \fBkey\fR is NULL for query expansion and the lookup key for
/*      result expansion.
/* .PP
/*      The following '%' expansions are performed on \fBvalue\fR:
/* .IP %%
/*      A literal percent character.
/* .IP %s
/*      The entire lookup key \fIaddr\fR.
/* .IP %u
/*      If \fBaddr\fR is a fully qualified address, the local part of the
/*      address.  Otherwise \fIaddr\fR.
/* .IP %d
/*      If \fIaddr\fR is a fully qualified address, the domain part of the
/*      address.  Otherwise the query against the database is suppressed and
/*      the lookup returns no results.
/*
/*      The following '%' expansions are performed on the lookup \fBkey\fR:
/* .IP %S
/*      The entire lookup key \fIkey\fR.
/* .IP %U
/*      If \fBkey\fR is a fully qualified address, the local part of the
/*      address.  Otherwise \fIkey\fR.
/* .IP %D
/*      If \fIkey\fR is a fully qualified address, the domain part of the
/*      address.  Otherwise the query against the database is suppressed and
/*      the lookup returns no results.
/*
/* .PP
/*      \fIdb_common_check_domain\fR checks domain list so that query optimization
/*      can be performed
/*
/* .PP
/*      \fIdb_common_sql_build_query\fR builds the "default"(backwards compatible)
/*      query from the 'table', 'select_field', 'where_field' and
/*      'additional_conditions' parameters, checking for errors.
/*
/* DIAGNOSTICS
/*      Fatal errors: invalid substitution format, invalid string_list pattern,
/*      insufficient parameters.
/* SEE ALSO
/*      dict(3) dictionary manager
/*      string_list(3) string list pattern matching
/*      match_ops(3) simple string or host pattern matching
/* 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
/*
/*      Liviu Daia
/*      Institute of Mathematics of the Romanian Academy
/*      P.O. BOX 1-764
/*      RO-014700 Bucharest, ROMANIA
/*
/*      Jose Luis Tallon
/*      G4 J.E. - F.I. - U.P.M.
/*      Campus de Montegancedo, S/N
/*      E-28660 Madrid, SPAIN
/*
/*      Victor Duchovni
/*      Morgan Stanley
/*--*/

 /*
  * System library.
  */
#include "sys_defs.h"
#include <stddef.h>
#include <string.h>

 /*
  * Global library.
  */
#include "cfg_parser.h"

 /*
  * Utility library.
  */
#include <mymalloc.h>
#include <vstring.h>
#include <msg.h>
#include <dict.h>

 /*
  * Application specific
  */
#include "db_common.h"

#define DB_COMMON_KEY_DOMAIN    (1 << 0)/* Need lookup key domain */
#define DB_COMMON_KEY_USER      (1 << 1)/* Need lookup key localpart */
#define DB_COMMON_VALUE_DOMAIN  (1 << 2)/* Need result domain */
#define DB_COMMON_VALUE_USER    (1 << 3)/* Need result localpart */
#define DB_COMMON_KEY_PARTIAL   (1 << 4)/* Key uses input substrings */

typedef struct {
    DICT   *dict;
    STRING_LIST *domain;
    int     flags;
    int     nparts;
}       DB_COMMON_CTX;

/* db_common_parse - validate query or result template */

int     db_common_parse(DICT *dict, void **ctxPtr, const char *format, int query)
{
    DB_COMMON_CTX *ctx = (DB_COMMON_CTX *) * ctxPtr;
    const char *cp;
    int     dynamic = 0;

    if (ctx == 0) {
        ctx = (DB_COMMON_CTX *) (*ctxPtr = mymalloc(sizeof *ctx));
        ctx->dict = dict;
        ctx->domain = 0;
        ctx->flags = 0;
        ctx->nparts = 0;
    }
    for (cp = format; *cp; ++cp)
        if (*cp == '%')
            switch (*++cp) {
            case '%':
                break;
            case 'u':
                ctx->flags |=
                    query ? DB_COMMON_KEY_USER | DB_COMMON_KEY_PARTIAL
                    : DB_COMMON_VALUE_USER;
                dynamic = 1;
                break;
            case 'd':
                ctx->flags |=
                    query ? DB_COMMON_KEY_DOMAIN | DB_COMMON_KEY_PARTIAL
                    : DB_COMMON_VALUE_DOMAIN;
                dynamic = 1;
                break;
            case 's':
            case 'S':
                dynamic = 1;
                break;
            case 'U':
                ctx->flags |= DB_COMMON_KEY_PARTIAL | DB_COMMON_KEY_USER;
                dynamic = 1;
                break;
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':

                /*
                 * Find highest %[1-9] index in query template. Input keys
                 * will be constrained to those with at least this many
                 * domain components. This makes the db_common_expand() code
                 * safe from invalid inputs.
                 */
                if (ctx->nparts < *cp - '0')
                    ctx->nparts = *cp - '0';
                /* FALLTHROUGH */
            case 'D':
                ctx->flags |= DB_COMMON_KEY_PARTIAL | DB_COMMON_KEY_DOMAIN;
                dynamic = 1;
                break;
            default:
                msg_fatal("db_common_parse: %s: Invalid %s template: %s",
                          dict->name, query ? "query" : "result", format);
            }
    return dynamic;
}

/* db_common_parse_domain - parse domain matchlist*/

void    db_common_parse_domain(CFG_PARSER *parser, void *ctxPtr)
{
    DB_COMMON_CTX *ctx = (DB_COMMON_CTX *) ctxPtr;
    char   *domainlist;
    const char *myname = "db_common_parse_domain";

    domainlist = cfg_get_str(parser, "domain", "", 0, 0);
    if (*domainlist) {
        ctx->domain = string_list_init(MATCH_FLAG_NONE, domainlist);
        if (ctx->domain == 0)

            /*
             * The "domain" optimization skips input keys that may in fact
             * have unwanted matches in the database, so failure to create
             * the match list is fatal.
             */
            msg_fatal("%s: %s: domain match list creation using '%s' failed",
                      myname, parser->name, domainlist);
    }
    myfree(domainlist);
}

/* db_common_dict_partial - Does query use partial lookup keys? */

int     db_common_dict_partial(void *ctxPtr)
{
#if 0                                   /* Breaks recipient_delimiter */
    DB_COMMON_CTX *ctx = (DB_COMMON_CTX *) ctxPtr;

    return (ctx->domain || ctx->flags & DB_COMMON_KEY_PARTIAL);
#endif
    return (0);
}

/* db_common_free_ctx - free parse context */

void    db_common_free_ctx(void *ctxPtr)
{
    DB_COMMON_CTX *ctx = (DB_COMMON_CTX *) ctxPtr;

    if (ctx->domain)
        string_list_free(ctx->domain);
    myfree((char *) ctxPtr);
}

/* db_common_expand - expand query and result templates */

int     db_common_expand(void *ctxArg, const char *format, const char *value,
                                 const char *key, VSTRING *result,
                                 db_quote_callback_t quote_func)
{
    const char *myname = "db_common_expand";
    DB_COMMON_CTX *ctx = (DB_COMMON_CTX *) ctxArg;
    const char *vdomain = 0;
    const char *kdomain = 0;
    const char *domain = 0;
    int     dflag = key ? DB_COMMON_VALUE_DOMAIN : DB_COMMON_KEY_DOMAIN;
    char   *vuser = 0;
    char   *kuser = 0;
    ARGV   *parts = 0;
    int     i;
    const char *cp;

    /* Skip NULL values, silently. */
    if (value == 0)
        return (0);

    /* Don't silenty skip empty query string or empty lookup results. */
    if (*value == 0) {
        if (key)
            msg_warn("table \"%s:%s\": empty lookup result for: \"%s\""
                     " -- ignored", ctx->dict->type, ctx->dict->name, key);
        else
            msg_warn("table \"%s:%s\": empty query string"
                     " -- ignored", ctx->dict->type, ctx->dict->name);
        return (0);
    }
    if (key) {
        /* This is a result template and the input value is the result */
        if (ctx->flags & (DB_COMMON_VALUE_DOMAIN | DB_COMMON_VALUE_USER))
            if ((vdomain = strrchr(value, '@')) != 0)
                ++vdomain;

        if (((!vdomain || !*vdomain) && (ctx->flags & DB_COMMON_VALUE_DOMAIN) != 0)
            || (vdomain == value + 1 && (ctx->flags & DB_COMMON_VALUE_USER) != 0))
            return (0);

        /* The result format may use the local or domain part of the key */
        if (ctx->flags & (DB_COMMON_KEY_DOMAIN | DB_COMMON_KEY_USER))
            if ((kdomain = strrchr(key, '@')) != 0)
                ++kdomain;

        /*
         * The key should already be checked before the query. No harm if the
         * query did not get optimized out, so we just issue a warning.
         */
        if (((!kdomain || !*kdomain) && (ctx->flags & DB_COMMON_KEY_DOMAIN) != 0)
        || (kdomain == key + 1 && (ctx->flags & DB_COMMON_KEY_USER) != 0)) {
            msg_warn("%s: %s: lookup key '%s' skipped after query", myname,
                     ctx->dict->name, value);
            return (0);
        }
    } else {
        /* This is a query template and the input value is the lookup key */
        if (ctx->flags & (DB_COMMON_KEY_DOMAIN | DB_COMMON_KEY_USER))
            if ((vdomain = strrchr(value, '@')) != 0)
                ++vdomain;

        if (((!vdomain || !*vdomain) && (ctx->flags & DB_COMMON_KEY_DOMAIN) != 0)
        || (vdomain == value + 1 && (ctx->flags & DB_COMMON_KEY_USER) != 0))
            return (0);
    }

    if (ctx->nparts > 0) {
        parts = argv_split(key ? kdomain : vdomain, ".");

        /*
         * Filter out input keys whose domains lack enough labels to fill-in
         * the query template. See below and also db_common_parse() which
         * initializes ctx->nparts.
         */
        if (parts->argc < ctx->nparts) {
            argv_free(parts);
            return (0);
        }

        /*
         * Skip domains with leading, consecutive or trailing '.' separators
         * among the required labels.
         */
        for (i = 0; i < ctx->nparts; i++)
            if (*parts->argv[parts->argc - i - 1] == 0) {
                argv_free(parts);
                return (0);
            }
    }
    if (VSTRING_LEN(result) > 0)
        VSTRING_ADDCH(result, ',');

#define QUOTE_VAL(d, q, v, buf) do { \
        if (q) \
            q(d, v, buf); \
        else \
            vstring_strcat(buf, v); \
    } while (0)

    /*
     * Replace all instances of %s with the address to look up. Replace %u
     * with the user portion, and %d with the domain portion. "%%" expands to
     * "%".  lowercase -> addr, uppercase -> key
     */
    for (cp = format; *cp; cp++) {
        if (*cp == '%') {
            switch (*++cp) {

            case '%':
                VSTRING_ADDCH(result, '%');
                break;

            case 's':
                QUOTE_VAL(ctx->dict, quote_func, value, result);
                break;

            case 'u':
                if (vdomain) {
                    if (vuser == 0)
                        vuser = mystrndup(value, vdomain - value - 1);
                    QUOTE_VAL(ctx->dict, quote_func, vuser, result);
                } else
                    QUOTE_VAL(ctx->dict, quote_func, value, result);
                break;

            case 'd':
                if (!(ctx->flags & dflag))
                    msg_panic("%s: %s: %s: bad query/result template context",
                              myname, ctx->dict->name, format);
                if (!vdomain)
                    msg_panic("%s: %s: %s: expanding domain-less key or value",
                              myname, ctx->dict->name, format);
                QUOTE_VAL(ctx->dict, quote_func, vdomain, result);
                break;

            case 'S':
                if (key)
                    QUOTE_VAL(ctx->dict, quote_func, key, result);
                else
                    QUOTE_VAL(ctx->dict, quote_func, value, result);
                break;

            case 'U':
                if (key) {
                    if (kdomain) {
                        if (kuser == 0)
                            kuser = mystrndup(key, kdomain - key - 1);
                        QUOTE_VAL(ctx->dict, quote_func, kuser, result);
                    } else
                        QUOTE_VAL(ctx->dict, quote_func, key, result);
                } else {
                    if (vdomain) {
                        if (vuser == 0)
                            vuser = mystrndup(value, vdomain - value - 1);
                        QUOTE_VAL(ctx->dict, quote_func, vuser, result);
                    } else
                        QUOTE_VAL(ctx->dict, quote_func, value, result);
                }
                break;

            case 'D':
                if (!(ctx->flags & DB_COMMON_KEY_DOMAIN))
                    msg_panic("%s: %s: %s: bad query/result template context",
                              myname, ctx->dict->name, format);
                if ((domain = key ? kdomain : vdomain) == 0)
                    msg_panic("%s: %s: %s: expanding domain-less key or value",
                              myname, ctx->dict->name, format);
                QUOTE_VAL(ctx->dict, quote_func, domain, result);
                break;

            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':

                /*
                 * Interpolate %[1-9] components into the query string. By
                 * this point db_common_parse() has identified the highest
                 * component index, and (see above) keys with fewer
                 * components have been filtered out. The "parts" ARGV is
                 * guaranteed to be initialized and hold enough elements to
                 * satisfy the query template.
                 */
                if (!(ctx->flags & DB_COMMON_KEY_DOMAIN)
                    || ctx->nparts < *cp - '0')
                    msg_panic("%s: %s: %s: bad query/result template context",
                              myname, ctx->dict->name, format);
                if (!parts || parts->argc < ctx->nparts)
                    msg_panic("%s: %s: %s: key has too few domain labels",
                              myname, ctx->dict->name, format);
                QUOTE_VAL(ctx->dict, quote_func,
                          parts->argv[parts->argc - (*cp - '0')], result);
                break;

            default:
                msg_fatal("%s: %s: invalid %s template '%s'", myname,
                          ctx->dict->name, key ? "result" : "query",
                          format);
            }
        } else
            VSTRING_ADDCH(result, *cp);
    }
    VSTRING_TERMINATE(result);

    if (vuser)
        myfree(vuser);
    if (kuser)
        myfree(kuser);
    if (parts)
        argv_free(parts);

    return (1);
}


/* db_common_check_domain - check domain list */

int     db_common_check_domain(void *ctxPtr, const char *addr)
{
    DB_COMMON_CTX *ctx = (DB_COMMON_CTX *) ctxPtr;
    char   *domain;

    if (ctx->domain) {
        if ((domain = strrchr(addr, '@')) != NULL)
            ++domain;
        if (domain == NULL || domain == addr + 1)
            return (0);
        if (match_list_match(ctx->domain, domain) == 0)
            return (0);
    }
    return (1);
}

/* db_common_sql_build_query -- build query for SQL maptypes */

void    db_common_sql_build_query(VSTRING *query, CFG_PARSER *parser)
{
    const char *myname = "db_common_sql_build_query";
    char   *table;
    char   *select_field;
    char   *where_field;
    char   *additional_conditions;

    /*
     * Build "old style" query: "select %s from %s where %s"
     */
    if ((table = cfg_get_str(parser, "table", NULL, 1, 0)) == 0)
        msg_fatal("%s: 'table' parameter not defined", myname);

    if ((select_field = cfg_get_str(parser, "select_field", NULL, 1, 0)) == 0)
        msg_fatal("%s: 'select_field' parameter not defined", myname);

    if ((where_field = cfg_get_str(parser, "where_field", NULL, 1, 0)) == 0)
        msg_fatal("%s: 'where_field' parameter not defined", myname);

    additional_conditions = cfg_get_str(parser, "additional_conditions",
                                        "", 0, 0);

    vstring_sprintf(query, "SELECT %s FROM %s WHERE %s='%%s' %s",
                    select_field, table, where_field,
                    additional_conditions);

    myfree(table);
    myfree(select_field);
    myfree(where_field);
    myfree(additional_conditions);
}