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upsc.c

/* upsc - simple "client" to test communications 

   Copyright (C) 1999  Russell Kroll <rkroll@exploits.org>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/

#include "common.h"

#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>

#include "upsclient.h"

static char       *upsname = NULL, *hostname = NULL;
static UPSCONN_t  *ups = NULL;

static void usage(const char *prog)
{
      printf("Network UPS Tools upsc %s\n\n", UPS_VERSION);

      printf("usage: %s -l | -L [<hostname>[:port]]\n", prog);
      printf("       %s <ups> [<variable>]\n", prog);

      printf("\nDemo program to display UPS variables.\n\n");

      printf("First form (lists UPSes):\n");
      printf("  -l         - lists each UPS on <hostname>, one per line.\n");
      printf("  -L         - lists each UPS followed by its description (from ups.conf).\n");
      printf("               Default hostname: localhost\n");

      printf("\nSecond form (lists variables and values):\n");
      printf("  <ups>      - upsd server, <upsname>[@<hostname>[:<port>]] form\n");
      printf("  <variable> - optional, display this variable only.\n");
      printf("               Default: list all variables for <host>\n");
}

static void printvar(const char *var)
{
      int         ret;
      unsigned int      numq, numa;
      const char  *query[4];
      char        **answer;

      /* old-style variable name? */
      if (!strchr(var, '.')) {
            fatalx(EXIT_FAILURE, "Error: old-style variable names are not supported");
      }

      query[0] = "VAR";
      query[1] = upsname;
      query[2] = var;

      numq = 3;

      ret = upscli_get(ups, numq, query, &numa, &answer);

      if (ret < 0) {

            /* new var and old upsd?  try to explain the situation */
            if (upscli_upserror(ups) == UPSCLI_ERR_UNKCOMMAND) {
                  fatalx(EXIT_FAILURE, "Error: variable unknown (old upsd detected)");
            }

            fatalx(EXIT_FAILURE, "Error: %s", upscli_strerror(ups));
      }

      if (numa < numq) {
            fatalx(EXIT_FAILURE, "Error: insufficient data (got %d args, need at least %d)", numa, numq);
      }

      printf("%s\n", answer[3]);
}

static void list_vars(void)
{
      int         ret;
      unsigned int      numq, numa;
      const char  *query[4];
      char        **answer;

      query[0] = "VAR";
      query[1] = upsname;
      numq = 2;

      ret = upscli_list_start(ups, numq, query);

      if (ret < 0) {

            /* check for an old upsd */
            if (upscli_upserror(ups) == UPSCLI_ERR_UNKCOMMAND) {
                  fatalx(EXIT_FAILURE, "Error: upsd is too old to support this query");
            }

            fatalx(EXIT_FAILURE, "Error: %s", upscli_strerror(ups));
      }

      while (upscli_list_next(ups, numq, query, &numa, &answer) == 1) {

            /* VAR <upsname> <varname> <val> */
            if (numa < 4) {
                  fatalx(EXIT_FAILURE, "Error: insufficient data (got %d args, need at least 4)", numa);
            }

            printf("%s: %s\n", answer[2], answer[3]);
      }
}

static void list_upses(int verbose)
{
      int         ret;
      unsigned int      numq, numa;
      const char  *query[4];
      char        **answer;

      query[0] = "UPS";
      numq = 1;

      ret = upscli_list_start(ups, numq, query);
      
      if (ret < 0) {
            /* check for an old upsd */
            if (upscli_upserror(ups) == UPSCLI_ERR_UNKCOMMAND) {
                  fatalx(EXIT_FAILURE, "Error: upsd is too old to support this query");
            }

            fatalx(EXIT_FAILURE, "Error: %s", upscli_strerror(ups));
      }

      while (upscli_list_next(ups, numq, query, &numa, &answer) == 1) {

            /* UPS <upsname> <description> */
            if (numa < 3) {
                  fatalx(EXIT_FAILURE, "Error: insufficient data (got %d args, need at least 3)", numa);
            }

            if(verbose) {
                  printf("%s: %s\n", answer[1], answer[2]);
            } else {
                  printf("%s\n", answer[1]);
            }
      }
}

static void clean_exit(void)
{
      if (ups) {
            upscli_disconnect(ups);
      }

      free(upsname);
      free(hostname);
      free(ups);
}

int main(int argc, char **argv)
{
      int   i, port;
      int   varlist = 0, verbose = 0;
      const char  *prog = xbasename(argv[0]);

      while ((i = getopt(argc, argv, "+hlLV")) != -1) {

            switch (i)
            {
            case 'L':
                  verbose = 1;
            case 'l':
                  varlist = 1;
                  break;

            case 'V':
                  fatalx(EXIT_SUCCESS, "Network UPS Tools upscmd %s", UPS_VERSION);

            case 'h':
            default:
                  usage(prog);
                  exit(EXIT_SUCCESS);
            }
      }

      argc -= optind;
      argv += optind;

      /* be a good little client that cleans up after itself */
      atexit(clean_exit);

      if (varlist) {
            if (upscli_splitaddr(argv[0] ? argv[0] : "localhost", &hostname, &port) != 0) {
                  fatalx(EXIT_FAILURE, "Error: invalid hostname.\nRequired format: [hostname[:port]]");
            }
      } else {
            if (upscli_splitname(argv[0], &upsname, &hostname, &port) != 0) {
                  fatalx(EXIT_FAILURE, "Error: invalid UPS definition.\nRequired format: upsname[@hostname[:port]]");
            }
      }

      ups = xmalloc(sizeof(*ups));

      if (upscli_connect(ups, hostname, port, UPSCLI_CONN_TRYSSL) < 0) {
            fatalx(EXIT_FAILURE, "Error: %s", upscli_strerror(ups));
      }

      if (varlist) {
            list_upses(verbose);
            exit(EXIT_SUCCESS);
      }

      if (argc > 1) {
            printvar(argv[1]);
      } else {
            list_vars();
      }

      exit(EXIT_SUCCESS);
}

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