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upscmd.c

/* upscmd - simple "client" to test instant commands via upsd

   Copyright (C) 2000  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 <pwd.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>

#include "upsclient.h"

struct list_t {
      char  *name;
      struct      list_t      *next;
};

static void usage(char *prog)
{
      printf("Network UPS Tools upscmd %s\n\n", UPS_VERSION);
      printf("usage: %s [-h]\n", prog);
      printf("       %s [-l <ups>]\n", prog);
      printf("       %s [-u <username>] [-p <password>] <ups> <command>\n\n", prog);
      printf("Administration program to initiate instant commands on UPS hardware.\n");
      printf("\n");
      printf("  -h            display this help text\n");
      printf("  -l <ups>      show available commands on UPS <ups>\n");
      printf("  -u <username> set username for command authentication\n");
      printf("  -p <password> set password for command authentication\n");
      printf("\n");
      printf("  <ups>         UPS identifier - <upsname>[@<hostname>[:<port>]]\n");
      printf("  <command>     Valid instant command - test.panel.start, etc.\n");

      exit(EXIT_SUCCESS);
}

static void clean_exit(UPSCONN_t *ups, char *upsname, char *hostname, int code)
{
      free(upsname);
      free(hostname);

      upscli_sendline(ups, "LOGOUT\n", 7);
      upscli_disconnect(ups);

      exit(code);
}

static void print_cmd(UPSCONN_t *ups, const char *upsname, char *cmdname)
{
      int   ret;
      unsigned int      numq, numa;
      char  **answer;
      const char  *query[4];

      query[0] = "CMDDESC";
      query[1] = upsname;
      query[2] = cmdname;
      numq = 3;

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

      if ((ret < 0) || (numa < numq)) {
            printf("%s\n", cmdname);
            return;
      }

      /* CMDDESC <upsname> <cmdname> <desc> */
      printf("%s - %s\n", cmdname, answer[3]);
}

static void listcmds(char *rawname)
{
      int   ret, port;
      unsigned int      numq, numa;
      char  *upsname, *hostname, **answer;
      const char  *query[4];
      UPSCONN_t   ups;
      struct      list_t      *lhead, *llast, *ltmp, *lnext;

      upsname = hostname = NULL;

      if (upscli_splitname(rawname, &upsname, &hostname, &port) != 0) {
            fprintf(stderr, "Error: invalid UPS definition.  Required format: upsname[@hostname[:port]]\n");
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      if (upscli_connect(&ups, hostname, port, 0) < 0) {
            fprintf(stderr, "Error: %s\n", upscli_strerror(&ups));
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      if (!upsname) {
            fprintf(stderr, "Error: a UPS name must be specified (upsname[@hostname[:port]])\n");
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      llast = lhead = NULL;

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

      ret = upscli_list_start(&ups, numq, query);

      if (ret < 0) {

            /* old upsd = no way to continue */
            if (upscli_upserror(&ups) == UPSCLI_ERR_UNKCOMMAND) {
                  fprintf(stderr, "Error: upsd is too old to support this query\n");
                  clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
            }

            fprintf(stderr, "Error: %s\n", upscli_strerror(&ups));
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      printf("Instant commands supported on UPS [%s]:\n\n", rawname);

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

      while (ret == 1) {

            /* CMD <upsname> <cmdname> */

            if (numa < 3) {
                  fprintf(stderr, "Error: insufficient data "
                        "(got %d args, need at least 3)\n", numa);
                  clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
            }

            /* sock this entry away for later */

            ltmp = xmalloc(sizeof(struct list_t));
            ltmp->name = xstrdup(answer[2]);
            ltmp->next = NULL;

            if (llast)
                  llast->next = ltmp;
            else
                  lhead = ltmp;

            llast = ltmp;

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

      /* walk the list and try to get descriptions, freeing as we go */

      ltmp = lhead;

      while (ltmp) {
            lnext = ltmp->next;

            print_cmd(&ups, upsname, ltmp->name);

            free(ltmp->name);
            free(ltmp);
            ltmp = lnext;
      }

      clean_exit(&ups, upsname, hostname, EXIT_SUCCESS);
}

static int do_cmd(UPSCONN_t *ups, const char *upsname, const char *cmd)
{
      char  buf[SMALLBUF];

      snprintf(buf, sizeof(buf), "INSTCMD %s %s\n", upsname, cmd);

      if (upscli_sendline(ups, buf, strlen(buf)) < 0) {
            fprintf(stderr, "Can't send instant command: %s\n",
                  upscli_strerror(ups));

            return EXIT_FAILURE;
      }

      if (upscli_readline(ups, buf, sizeof(buf)) < 0) {
            fprintf(stderr, "Instant command failed: %s\n", 
                  upscli_strerror(ups));

            return EXIT_FAILURE;
      }

      return EXIT_SUCCESS;
}

int main(int argc, char **argv)
{
      int   i, ret, have_un, have_pw;
      char  *prog, buf[SMALLBUF], username[SMALLBUF], password[SMALLBUF],
            *pwtmp;

      int   port;
      char  *upsname, *hostname;
      UPSCONN_t   ups;

      prog = argv[0];

      have_un = have_pw = 0;

      while ((i = getopt(argc, argv, "+l:hu:p:V")) != -1) {
            switch (i) {
                  case 'l':
                        listcmds(optarg);
                        break;

                  case 'u':
                        snprintf(username, sizeof(username), "%s", 
                              optarg);
                        have_un = 1;
                        break;

                  case 'p':
                        snprintf(password, sizeof(password), "%s", 
                              optarg);
                        have_pw = 1;
                        break;

                  case 'V':
                        printf("Network UPS Tools upscmd %s\n",
                              UPS_VERSION);
                        exit(EXIT_SUCCESS);

                  case 'h':
                  default:
                        usage(prog);
                        break;
            }
      }

      argc -= optind;
      argv += optind;

      if (argc < 2)
            usage(prog);

      upsname = hostname = NULL;

      if (upscli_splitname(argv[0], &upsname, &hostname, &port) != 0) {
            fprintf(stderr, "Error: invalid UPS definition.  Required format: upsname[@hostname[:port]]\n");
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      if (upscli_connect(&ups, hostname, port, 0) < 0) {
            fprintf(stderr, "Error: %s\n", upscli_strerror(&ups));
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      if (!have_un) {
            struct      passwd      *pw;

            memset(username, '\0', sizeof(username));
            pw = getpwuid(getuid());

            if (pw)
                  printf("Username (%s): ", pw->pw_name);
            else
                  printf("Username: ");

            fgets(username, SMALLBUF, stdin);

            /* deal with that pesky newline */
            if (strlen(username) > 1)
                  username[strlen(username) - 1] = '\0';
            else {
                  if (!pw)
                        fatalx(EXIT_FAILURE, "No username available - even tried getpwuid");

                  snprintf(username, sizeof(username), "%s", pw->pw_name);
            }
      }

      /* getpass leaks slightly - use -p when testing in valgrind */
      if (!have_pw) {
            pwtmp = GETPASS("Password: ");

            if (!pwtmp) {
                  fprintf(stderr, "getpass failed: %s\n", strerror(errno));
                  clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
            }
                  
            snprintf(password, sizeof(password), "%s", pwtmp);
      }

      snprintf(buf, sizeof(buf), "USERNAME %s\n", username);

      if (upscli_sendline(&ups, buf, strlen(buf)) < 0) {
            fprintf(stderr, "Can't set username: %s\n", 
                  upscli_strerror(&ups));

            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      ret = upscli_readline(&ups, buf, sizeof(buf));

      if (ret < 0) {
            if (upscli_upserror(&ups) == UPSCLI_ERR_UNKCOMMAND) {
                  fprintf(stderr, "Set username failed due to an "
                        "unknown command.\n");

                  fprintf(stderr, "You probably need to upgrade upsd.\n");
                  clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
            }

            fprintf(stderr, "Set username failed: %s\n", 
                  upscli_strerror(&ups));

            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      snprintf(buf, sizeof(buf), "PASSWORD %s\n", password);

      if (upscli_sendline(&ups, buf, strlen(buf)) < 0) {
            fprintf(stderr, "Can't set password: %s\n", 
                  upscli_strerror(&ups));
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      if (upscli_readline(&ups, buf, sizeof(buf)) < 0) {
            fprintf(stderr, "Set password failed: %s\n", 
                  upscli_strerror(&ups));

            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      /* no upsname means die here */
      if (!upsname) {
            fprintf(stderr, "Error: a UPS name must be specified (upsname[@hostname[:port]])\n");
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      /* also fallback for old command names */
      if (!strchr(argv[1], '.')) {
            fprintf(stderr, "Error: old command names are not supported\n");
            clean_exit(&ups, upsname, hostname, EXIT_FAILURE);
      }

      ret = do_cmd(&ups, upsname, argv[1]);
      clean_exit(&ups, upsname, hostname, ret);

      /* NOTREACHED */
      exit(EXIT_FAILURE);
}

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