/* $Id$
 *
 * This generates the network table.
 *
 * Copyright (C) 1994-1998 by the Massachusetts Institute of Technology.
 * For copying and distribution information, please see the file
 * <mit-copyright.h>.
 */

#include <mit-copyright.h>
#include <moira.h>

#include <sys/stat.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <stdio.h>
#include <time.h>

#include "util.h"

EXEC SQL INCLUDE sqlca;

RCSID("$Header$");

char *whoami = "network.gen";
char *db = "moira/moira";

char *cidr_from_inaddr(struct in_addr in);

int main(int argc, char **argv)
{
  FILE *out = stdout;
  char *outf = NULL, *cidr = NULL, address[BUFSIZ], outft[MAXPATHLEN];
  struct timeval now;
  struct in_addr addr, maskaddr;
  EXEC SQL BEGIN DECLARE SECTION;
  int id, saddr;
  char name[SUBNET_NAME_SIZE], description[SUBNET_DESCRIPTION_SIZE];
  char mask[SUBNET_MASK_SIZE];
  EXEC SQL END DECLARE SECTION;

  EXEC SQL CONNECT :db;

  if (argc == 2)
    {
      outf = argv[1];
      sprintf(outft, "%s~", outf);
      if (!(out = fopen(outft, "w")))
	{
	  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;

  EXEC SQL WHENEVER SQLERROR GOTO sqlerr;

  gettimeofday(&now, NULL);

  fprintf(out, "; MIT Network Table\n;\n");
  fprintf(out, "; \t%cAuthor: $\n", '$');
  fprintf(out, "; \t%cDate: $\n", '$');
  fprintf(out, "; \t%cRevision: $\n;\n", '$');
  fprintf(out, "; Network table generated by Moira at %s;\n",
	  ctime(&now.tv_sec));

  EXEC SQL DECLARE x CURSOR FOR SELECT
    name, snet_id, saddr, mask, description
    FROM subnet ORDER BY saddr;
  EXEC SQL OPEN x;
  while (1)
    {
      EXEC SQL FETCH x INTO :name, :id, :saddr, :mask, :description;
      if (sqlca.sqlcode)
	break;
      if (id == 0)
	continue;
      if (!*strtrim(name))
	continue;
      addr.s_addr = htonl(saddr);

      maskaddr.s_addr = htonl(atoi(mask));
      cidr = cidr_from_inaddr(maskaddr);

      strcpy(address, inet_ntoa(addr));
      if (cidr)
	strcat(address, cidr);

      fprintf(out, "NETWORK : %-16.16s : %-15.15s : %s\n", name,
	      address, strtrim(description));
    }

  EXEC SQL CLOSE x;

  EXEC SQL COMMIT;

  fprintf(out, "; End of automatically generated network table\n");
  if (fclose(out))
    {
      perror("close failed");
      exit(MR_CCONFIG);
    }
  if (outf)
    fix_file(outf);
  exit(MR_SUCCESS);

sqlerr:
  db_error(sqlca.sqlcode);
  exit(MR_DBMS_ERR);
}

char *cidr_from_inaddr(struct in_addr in) {
  char *ptr1, *ptr2, *address, *out;
  int a, b, c, d, addr, i, j = 0, k = 0;
  int bits[32];

  address = inet_ntoa(in);
  
  ptr1 = ptr2 = address;
  ptr2 = (char *)strchr(ptr1, '.');
  if (!ptr2) 
    return(NULL);
  a = atoi(ptr1);

  ptr1 = ptr2 + 1;
  ptr2 = (char *)strchr(ptr1, '.');
  if (!ptr2)
    return(NULL);
  b = atoi(ptr1);

  ptr1 = ptr2 + 1;
  ptr2 = (char *)strchr(ptr1, '.');
  if (!ptr2)
    return(NULL);
  c = atoi(ptr1);

  ptr1 = ptr2 + 1;
  d = atoi(ptr1);

  if (a < 0 || a > 255 ||
      b < 0 || b > 255 ||
      c < 0 || c > 255 ||
      d < 0 || d > 255)
    return(NULL);

  addr = d + (c*256) + (b*256*256) + (a*256*256*256);

  for (i = 0; i < 32; i++) {
    bits[i] = (addr & 1);
    addr = (addr >> 1);
  }
  
  while (bits[j] == 0) {
    j++;
    if (j > 31) break;
  }
  while (bits[j] == 1) {
    j++;
    k++;
    if (j > 31) break;
  }

  if (j != 32)
    return(NULL);

  out = (char *)malloc(20);
  if (!out)
    exit(MR_NO_MEM);
  sprintf(out, "/%i", k);

  return(out);
}