/* $Header$
 *
 * This generates the hstath.txt hosttable.
 *
 *  (c) Copyright 1993 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 <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
EXEC SQL INCLUDE sqlca;

extern int errno;
char *whoami = "hosts.gen";
char *db = "moira/moira";

main(argc, argv)
int argc;
char **argv;
{
    FILE *out = stdout;
    char *outf = NULL, outft[64], *p, buf[256];
    struct stat sb;
    struct timeval now;
    int flag1, flag2, i;
    struct hash *aliases;
    EXEC SQL BEGIN DECLARE SECTION;
    int id;
    char name[65], vendor[33], model[33], os[33], addr[17];
    EXEC SQL END DECLARE SECTION;

    EXEC SQL CONNECT :db;

    if (argc == 2) {
	if (stat(argv[1], &sb) == 0) {
	    if (ModDiff(&flag1, "machine", sb.st_mtime) ||
		ModDiff(&flag2, "subnet", sb.st_mtime))
	      exit(MR_DATE);
	    if (flag1 < 0 && flag2 < 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 = fopen(outft, "w")) == NULL) {
	    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 Host Table\n;\n");
    fprintf(out, "; \t%cAuthor: $\n", '$');
    fprintf(out, "; \t%cDate: $\n", '$');
    fprintf(out, "; \t%cRevision: $\n;\n", '$');
    fprintf(out, "; Host table generated by Moira at %s;\n",
	    ctime(&now.tv_sec));

    EXEC SQL DECLARE y CURSOR FOR SELECT
      mach_id, name FROM hostalias;
    EXEC SQL OPEN y;
    aliases = create_hash(1001);
    while (1) {
	EXEC SQL FETCH y INTO :id, :name;
	if (sqlca.sqlcode != 0) break;
	if (id == 0) continue;
	if (*strtrim(name) == 0) continue;
	if ((i = strlen(name)) < 9 || strcmp(&name[i-8], ".MIT.EDU")) {
	    fprintf(stderr, "Name %s not in MIT domain\n", name);
	    continue;
	} else {
	    name[i-8] = 0;
	}
	if (p = hash_lookup(aliases, id)) {
	    sprintf(buf, "%s,%s", p, name);
	    hash_update(aliases, id, strsave(buf));
	    free(p);
	} else
	  hash_store(aliases, id, strsave(name));
    }

    EXEC SQL DECLARE x CURSOR FOR SELECT 
      name, mach_id, vendor, model, os, address
      FROM machine WHERE status=1 ORDER BY address;
    EXEC SQL OPEN x;
    while (1) {
	EXEC SQL FETCH x INTO :name, :id, :vendor, :model, :os, :addr;
	if (sqlca.sqlcode != 0) break;
	if (id == 0) continue;
	if (*strtrim(name) == 0) continue;
	if ((i = strlen(name)) < 9 || strcmp(&name[i-8], ".MIT.EDU")) {
	    continue;
	} else {
	    name[i-8] = 0;
	}
	strtrim(vendor);
	strtrim(model);
	strtrim(os);
	strtrim(addr);
	if (*addr == 0 || inet_addr(addr) == -1)
	  continue;
	if (p = hash_lookup(aliases, id))
	  sprintf(buf, "%s,%s", name, p);
	else
	  strcpy(buf, name);
	fprintf(out, "HOST : %s : %s : ", addr, buf);
	if ((*vendor || *model) && *os) {
	    if (*vendor && *model)
	      fprintf(out, "%s/%s : %s :\n", vendor, model, os);
	    else
	      fprintf(out, "%s%s : %s :\n", vendor, model, os);
	} else
	  fputs("\n", out);
    }

    EXEC SQL CLOSE x;

    EXEC SQL COMMIT;

    fprintf(out, "; End of automatically generated host 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);
}