/* $Header$
 *
 * This generates a list of users and their MIT ID numbers and the
 * signatures which guarentee this mapping.
 *
 *  (c) Copyright 1992 by the Massachusetts Institute of Technology.
 *  For copying and distribution information, please see the file
 *  <mit-copyright.h>.
 */

#include <mit-copyright.h>
#include <stdio.h>
#include <moira.h>
#include <moira_site.h>
#include <des.h>
#include <krb.h>
#include <gdss.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/file.h>
#include <strings.h>
#include <ctype.h>
EXEC SQL INCLUDE sqlca;

extern int errno;
char *whoami = "sis.gen";


main(argc, argv)
int argc;
char **argv;
{
    int out = 1 /* stdout */;
    char *outf = NULL, outft[64];
    struct stat sb;
    int flag1;
    SigInfo si;
    struct timeval now;
    EXEC SQL BEGIN DECLARE SECTION;
    char login[9], sig[257], id[17], kname[257];
    int timestamp, cutoff;
    struct { char login[12];
	     char id[12];
	     char sig[256];
	 } outrec;
    EXEC SQL END DECLARE SECTION;

    initialize_sms_error_table ();

#ifsql INGRES
    EXEC SQL CONNECT moira;
    EXEC SQL SET LOCKMODE SESSION WHERE LEVEL=TABLE, READLOCK=SHARED;
#endsql
#ifsql INFORMIX
    EXEC SQL DATABASE moira;
#endsql

    if (argc == 2) {
	if (stat(argv[1], &sb) == 0) {
	    if (ModDiff (&flag1, "users", sb.st_mtime) == 0 &&
		flag1 < 0) {
		fprintf(stderr, "File %s does not need to be rebuilt.\n",
			argv[1]);
		exit(MR_NO_CHANGE);
	    }
	}
	outf = argv[1];
	sprintf(outft, "%s~", outf);
	if ((out = open(outft, O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, 0666)) < 0) {
	    fprintf(stderr, "unable to open %s for output\n", outf);
	    exit(MR_OCONFIG);
	}
    } else if (argc != 1) {
	fprintf(stderr, "usage: %s [outfile]\n", argv[0]);
	exit(MR_ARGS);
    } else {
	outf = NULL;
    }

    /* the cutoff time is 14 days before now */
    gettimeofday(&now, NULL);
    cutoff = now.tv_sec - 14 * 24 * 60 * 60;

    /* The following is declarative, not executed,
     * and so is dependent on where it is in the file,
     * not in the order of execution of statements.
     */
    EXEC SQL WHENEVER SQLERROR GOTO sqlerr;

    /* lock user table first */

    EXEC SQL SELECT modtime INTO :id FROM users WHERE users_id = 0;

    EXEC SQL DECLARE x CURSOR FOR
      SELECT u.login, u.clearid, u.signature, u.sigdate, s.string
      FROM users u, strings s
	WHERE u.status = 1 and u.sigwho = s.string_id and u.sigwho != 0
	  and u.secure <= :cutoff and u.secure != 0;
    EXEC SQL OPEN x;
    while (1) {
	EXEC SQL FETCH x INTO :login, :id, :sig, :timestamp, :kname;
	if (sqlca.sqlcode != 0) break;
	if (id == 0) continue;
	if (!isdigit(id[1])) continue;
	strtrim(login);
	strtrim(id);
	strtrim(kname);
	strcpy(outrec.login, login);
	strcpy(outrec.id, id);
	si.timestamp = timestamp;
	si.SigInfoVersion = 0; /* XXXXXX this isn't used */
	kname_parse(si.pname, si.pinst, si.prealm, kname);
	si.rawsig = (unsigned char *)sig;
	GDSS_Recompose(&si, outrec.sig);
	write(out, &outrec, sizeof(outrec));
    }
    EXEC SQL CLOSE x;

#ifsql INGRES
    EXEC SQL DISCONNECT;
#endsql
#ifsql INFORMIX
    EXEC SQL CLOSE DATABASE;
#endsql

    if (close(out)) {
	perror("close failed");
	exit(MR_CCONFIG);
    }
    if (outf)
      fix_file(outf);
    exit(MR_SUCCESS);

 sqlerr:
    com_err(whoami, MR_INGRES_ERR, " code %d\n", sqlca.sqlcode);
#ifsql INGRES
    if (sqlca.sqlcode == 17700 || sqlca.sqlcode == -37000)
      exit(MR_DEADLOCK);
#endsql
    critical_alert("DCM", "SIS build encountered INGRES ERROR %d",
		   sqlca.sqlcode);
    exit(MR_INGRES_ERR);
}