/*
 * Copyright (c) 1997-1998 Erez Zadok
 * Copyright (c) 1990 Jan-Simon Pendry
 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry at Imperial College, London.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      %W% (Berkeley) %G%
 *
 * $Id: mk-amd-map.c,v 1.3 1998/08/27 02:56:47 obrien Exp $
 */

/*
 * Convert a file map into an ndbm map
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>

/* dummy variables */
char hostname[MAXHOSTNAMELEN];
int orig_umask, foreground, debug_flags;
pid_t mypid;
serv_state amd_state;


#ifdef HAVE_MAP_NDBM

static int
store_data(voidp db, char *k, char *v)
{
  datum key, val;

  key.dptr = k;
  val.dptr = v;
  key.dsize = strlen(k) + 1;
  val.dsize = strlen(v) + 1;
  return dbm_store((DBM *) db, key, val, DBM_INSERT);
}


/*
 * Read one line from file.
 */
static int
read_line(char *buf, int size, FILE *fp)
{
  int done = 0;

  do {
    while (fgets(buf, size, fp)) {
      int len = strlen(buf);

      done += len;
      if (len > 1 && buf[len - 2] == '\\' && buf[len - 1] == '\n') {
	int ch;
	buf += len - 2;
	size -= len - 2;
	*buf = '\n';
	buf[1] = '\0';

	/*
	 * Skip leading white space on next line
	 */
	while ((ch = getc(fp)) != EOF && isascii(ch) && isspace(ch)) ;
	(void) ungetc(ch, fp);
      } else {
	return done;
      }
    }
  } while (size > 0 && !feof(fp));

  return done;
}


/*
 * Read through a map.
 */
static int
read_file(FILE *fp, char *map, voidp db)
{
  char key_val[2048];
  int chuck = 0;
  int line_no = 0;
  int errs = 0;

  while (read_line(key_val, sizeof(key_val), fp)) {
    char *kp;
    char *cp;
    char *hash;
    int len = strlen(key_val);

    line_no++;

    /*
     * Make sure we got the whole line
     */
    if (key_val[len - 1] != '\n') {
      fprintf(stderr, "line %d in \"%s\" is too long", line_no, map);
      chuck = 1;
    } else {
      key_val[len - 1] = '\0';
    }

    /*
     * Strip comments
     */
    hash = strchr(key_val, '#');
    if (hash)
      *hash = '\0';

    /*
     * Find start of key
     */
    for (kp = key_val; *kp && isascii(*kp) && isspace((int)*kp); kp++) ;

    /*
     * Ignore blank lines
     */
    if (!*kp)
      goto again;

    /*
     * Find end of key
     */
    for (cp = kp; *cp && (!isascii(*cp) || !isspace((int)*cp)); cp++) ;

    /*
     * Check whether key matches, or whether
     * the entry is a wildcard entry.
     */
    if (*cp)
      *cp++ = '\0';
    while (*cp && isascii(*cp) && isspace((int)*cp))
      cp++;
    if (*kp == '+') {
      fprintf(stderr, "Can't interpolate %s\n", kp);
      errs++;
    } else if (*cp) {
      if (db) {
	if (store_data(db, kp, cp) < 0) {
	  fprintf(stderr, "Could store %s -> %s\n", kp, cp);
	  errs++;
	}
      } else {
	printf("%s\t%s\n", kp, cp);
      }
    } else {
      fprintf(stderr, "%s: line %d has no value field", map, line_no);
      errs++;
    }

  again:
    /*
     * If the last read didn't get a whole line then
     * throw away the remainder before continuing...
     */
    if (chuck) {
      while (fgets(key_val, sizeof(key_val), fp) &&
	     !strchr(key_val, '\n')) ;
      chuck = 0;
    }
  }
  return errs;
}


static int
remove_file(char *f)
{
  if (unlink(f) < 0 && errno != ENOENT)
    return -1;

  return 0;
}


int
main(int argc, char *argv[])
{
  FILE *mapf;
  int mapfd = -1;
  char *map;
  int rc = 0;
  DBM *mapd = NULL;
  static char maptmp[] = "dbmXXXXXX";
  char maptdb[16];
  char *mapdb = (char *) NULL;
  int len;
  char *sl;
  int printit = 0;
  int usage = 0;
  int ch;
  extern int optind;

  /* test options */
  while ((ch = getopt(argc, argv, "p")) != -1)
    switch (ch) {
    case 'p':
      printit = 1;
      break;
    default:
      usage++;
      break;
    }

  if (usage || optind != (argc - 1)) {
    fputs("Usage: mk-amd-map [-p] file-map\n", stderr);
    exit(1);
  }
  map = argv[optind];

  /* test if can get to the map directory */
  sl = strrchr(map, '/');
  if (sl) {
    *sl = '\0';
    if (chdir(map) < 0) {
      fputs("Can't chdir to ", stderr);
      perror(map);
      exit(1);
    }
    map = sl + 1;
  }

  if (!printit) {
    len = strlen(map);
    mapdb = (char *) malloc(len + 4);
    if (!mapdb) {
      perror("mk-amd-map: malloc");
      exit(1);
    }
#ifdef HAVE_MKSTEMP
    mapfd = mkstemp(maptmp);
#else /* not HAVE_MKSTEMP */
    map = mktemp(maptmp);
    if (!maptmp) {
      fprintf(stderr, "cannot create temporary file\n");
      exit(1);
    }
    mapfd = open(map, O_RDONLY);
#endif /* not HAVE_MKSTEMP */

    /* open DBM files */
    sprintf(maptdb, "%s.db", maptmp);
    if (remove_file(maptdb) < 0) {
      fprintf(stderr, "Can't remove existing temporary files;");
      perror(maptdb);
      exit(1);
    }
  }
  /* open and check if map file was opened OK */
  mapf = fdopen(mapfd, "r");
  if (mapf && !printit)
    mapd = dbm_open(maptmp, O_RDWR|O_CREAT, 0444);
  else
    mapd = 0;

#ifndef DEBUG
  /* ignore ^C if debuggung is on (but why?) */
  signal(SIGINT, SIG_IGN);
#endif /* not DEBUG */

  if (mapd || printit) {
    int error = read_file(mapf, map, mapd);
    (void) close(mapfd);
    (void) fclose(mapf);
	dbm_close(mapd);
    if (printit) {
      if (error) {
	fprintf(stderr, "Error creating ndbm map for %s\n", map);
	rc = 1;
      }
    } else {

      if (error) {
	fprintf(stderr, "Error reading source file  %s\n", map);
	rc = 1;
      } else {
	sprintf(mapdb, "%s.db", map);
	if (unlink(mapdb) == 0)
	  fprintf(stderr, "WARNING: existing map \"%s.db\" destroyed\n", map);
	if (rename(maptdb, mapdb) < 0) {
	  fprintf(stderr, "Couldn't rename %s to ", maptdb);
	  perror(mapdb);
	  /* Throw away the temporary map */
	  unlink(maptdb);
	  rc = 1;
	}
      }
    }

  } else {
    fprintf(stderr, "Can't open \"%s.db\" for ", map);
    perror("writing");
    rc = 1;
  }
  exit(rc);
}

#else /* not HAVE_MAP_NDBM */

main()
{
  fputs("mk-amd-map: This system does not support hashed database files\n", stderr);
  exit(1);
}

#endif /* not HAVE_MAP_NDBM */