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leveldb.c

/***************************************************************************
                          leveldb.c  -  description
                             -------------------
    begin                : Sun Oct 3 1999
    copyright            : Modifications (C) 1999 by Peter Putzer
    email                : putzer@kde.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.                                   *
 *                                                                         *
 ***************************************************************************/

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <locale.h> 
#include <sys/mman.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

/* Changes
   2000-08-04 - Peter Putzer <putzer@kde.org>
                fixed compilation on *BSD (use GLOB_NOCHECK & strcmp instead of
                checking for GLOB_NOMATCH)

   1999-04-11 - Peter Putzer <putzer@kde.org>
                modified leveldb.h for use with C++
            
   1998-09-22 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
                i18n for init.d scripts (eg.: description(pt_BR) is a brazilian
            portuguese description for the package) 
*/

#define _(String) String

#include "leveldb.h"

int parseLevels(const char* str, int emptyOk) {
  const char* chptr = str;
  int rc = 0;

  if (!str || !strlen(str))
    return emptyOk ? 0 : -1;
  
  while (*chptr) {
    if (!isdigit(*chptr) || *chptr > '6') return -1;
    rc |= 1 << (*chptr - '0');
    chptr++;
  }
  
  return rc;
}

int readServiceInfo(const char* RUNLEVELS, const char * name, struct service * service) {
  char * filename = (char *) malloc(strlen(name) + strlen(RUNLEVELS) + 50);
  int fd, i;
  struct stat sb;
  char * bufstart, * bufstop, * start, * end, * next;
  struct service serv = { NULL, -1, -1, -1, NULL };
  char overflow;
  char english;
  char is_my_lang = 0;
  char levelbuf[20];
  char * lang = getenv ("LANG"),
    * final_parenthesis,
    * english_desc = NULL;
  char my_lang_loaded = 0;

  sprintf(filename, "%s/init.d/%s", RUNLEVELS, name);

  if ((fd = open(filename, O_RDONLY)) < 0) 
  {
     free(filename);
     return -1;
  }
  free(filename);
  fstat(fd, &sb);

  bufstart = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
  if (bufstart == ((caddr_t) -1)) {
      close(fd);  
      return -1;
  }

  bufstop = bufstart + sb.st_size;
  close(fd);

  next = bufstart;
  while (next < bufstop && (serv.levels == -1 || !serv.desc)) {
      start = next;

      while (isspace(*start) && start < bufstop) start++;
      if (start == bufstop) break; 

      end = strchr(start, '\n');
      if (!end) 
      next = end = bufstop;
      else
      next = end + 1;

      if (*start != '#') continue;

      start++;    
      while (isspace(*start) && start < end) start++;
      if (start == end) continue;

      if (!strncmp(start, "chkconfig:", 10)) {
      start += 10;
      while (isspace(*start) && start < end) start++;
      if (start == end) {
            if (serv.desc) free(serv.desc);
            munmap(bufstart, sb.st_size);
            return 1;
      }

      if ((sscanf(start, "%19s %d %d%c", levelbuf,
                  &serv.sPriority, &serv.kPriority, &overflow) != 4) ||
          overflow != '\n') {
            if (serv.desc) free(serv.desc);
            munmap(bufstart, sb.st_size);
            return 1;
      }

      if (!strcmp(levelbuf, "-"))
            serv.levels = 0;
      else
            serv.levels = parseLevels(levelbuf, 0);
      if (serv.levels == -1) {
            if (serv.desc) free(serv.desc);
            munmap(bufstart, sb.st_size);
            return 1;
      }
      } else if (!strncmp(start, "description", 11)) {
      start += 11;

      english = *start == ':';

      if (!english) {
            if (*start != '(') {
          if (serv.desc) free(serv.desc);
          munmap(bufstart, sb.st_size);
          return 1;
            }

        ++start;
            final_parenthesis = strchr (start, ')');

            if (final_parenthesis == NULL || final_parenthesis - start > 5) {
          if (serv.desc) free(serv.desc);
          munmap(bufstart, sb.st_size);
          return 1;
            }

            is_my_lang = lang ? strncmp (lang, start, strlen (lang)) == 0 : 0;
            start = final_parenthesis + 2;
      } else ++start;

      while (isspace(*start) && start < end) start++;
      if (start == end) {
            munmap(bufstart, sb.st_size);
            return 1;
      }
      {
          char* desc = malloc(end - start + 1);
          strncpy(desc, start, end - start);
          desc[end - start] = '\0';

          start = next;

          while (desc[strlen(desc) - 1] == '\\') {
          desc[strlen(desc) - 1] = '\0';
          start = next;
            
          while (isspace(*start) && start < bufstop) start++;
          if (start == bufstop || *start != '#') {
                munmap(bufstart, sb.st_size);
                return 1;
          }

          start++;

          while (isspace(*start) && start < bufstop) start++;
          if (start == bufstop) {
                munmap(bufstart, sb.st_size);
                return 1;
          }

          end = strchr(start, '\n');
          if (!end) 
                next = end = bufstop;
          else
                next = end + 1;

          i = strlen(desc);
          desc = realloc(desc, i + end - start + 1);
          strncat(desc, start, end - start);
          desc[i + end - start] = '\0';

          start = next;
          }

          if (desc) {
            if (my_lang_loaded) {
            free(desc);
          } else if (is_my_lang) {
            if (serv.desc)
              free(serv.desc);

            serv.desc = desc;
            break;
          } else if (english) {
            if (serv.desc)
              free(serv.desc);

            if (english_desc)
              free (english_desc);

            english_desc = desc;
          } else free (desc);
          }
        }
      }
  }

  munmap(bufstart, sb.st_size);

  if (!serv.desc) {
    if (english_desc)
      serv.desc = english_desc;
  } else if (english_desc)
      free (english_desc);

  if ((serv.levels == -1 ) || !serv.desc) {
      return 1;
  } 

  serv.name = strdup(name);

  *service = serv;
  return 0;
}

/* returns -1 on error */
int currentRunlevel(void) {
  FILE * p;
  char response[50];

  p = popen("/sbin/runlevel", "r");
  if (!p) return -1;

  if (!fgets(response, sizeof(response), p)) {
      pclose(p);
      return -1;
  }

  pclose(p);

  if (response[1] != ' ' || !isdigit(response[2]) || response[3] != '\n') 
      return -1;

  return response[2] - '0';
}

int findServiceEntries(const char* RUNLEVELS, const char* name, int level, glob_t * globresptr) {
  char match[200];
  glob_t globres;
  int rc;

  sprintf(match, "%s/rc%d.d/[SK][0-9][0-9]%s", RUNLEVELS, level, name);

  rc = glob(match, GLOB_ERR | GLOB_NOSORT | GLOB_NOCHECK, NULL, &globres);

  if (rc) {
      fprintf(stderr, _("failed to glob pattern %s: %s\n"), match,
            strerror(errno));
      return 1;
  } else if (!strcmp(match, globres.gl_pathv[0])) {
      globresptr->gl_pathc = 0;
      return 0;
  }

  *globresptr = globres;
  return 0;
}

int isConfigured(const char* RUNLEVELS, const char* name, int level) {
  glob_t globres;

  if (findServiceEntries(RUNLEVELS, name, level, &globres))
      exit(1);

  if (!globres.gl_pathc)
      return 0;

  globfree(&globres);
  return 1;
}

int isOn(const char* RUNLEVELS, const char* name, int level) {
  glob_t globres;

  if (level == -1) {
      level = currentRunlevel();
      if (level == -1) {
      fprintf(stderr, _("cannot determine current run level\n"));
      return 0;
      }
  }

  if (findServiceEntries(RUNLEVELS, name, level, &globres))
      exit(1);

  if (!globres.gl_pathc || !strstr(globres.gl_pathv[0], "/S"))
      return 0;

  globfree(&globres);
  return 1;
}

int doSetService(const char* RUNLEVELS, struct service s, int level, int on) {
  int priority = on ? s.sPriority : s.kPriority;
  char linkname[200];
  char linkto[200];
  glob_t globres;
  int i;

  if (!findServiceEntries(RUNLEVELS, s.name, level, &globres)) {
    for (i = 0; (unsigned int) i < globres.gl_pathc; i++)
      unlink(globres.gl_pathv[i]);
      if (globres.gl_pathc) globfree(&globres);
  }

  sprintf(linkname, "%s/rc%d.d/%c%02d%s", RUNLEVELS, level,
          on ? 'S' : 'K', priority, s.name);
  sprintf(linkto, "../init.d/%s", s.name);

  unlink(linkname);     /* just in case */
  if (symlink(linkto, linkname)) {
      fprintf(stderr, _("failed to make symlink %s: %s\n"), linkname,
            strerror(errno));
      return 1;
  }

  return 0; 
}


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