read_config.c

来自「eCos操作系统源码」· C语言 代码 · 共 1,133 行 · 第 1/3 页

 * Read <filename> and process each line in accordance with the list of
 * <line_handler> functions.
 *
 *
 * For each line in <filename>, search the list of <line_handler>'s 
 * for an entry that matches the first token on the line.  This comparison is
 * case insensitive.
 *
 * For each match, check that <when> is the designated time for the
 * <line_handler> function to be executed before processing the line.
 */
void read_config(const char *filename,
		 struct config_line *line_handler,
		 int when)
{
#ifdef CYGPKG_SNMPLIB_FILESYSTEM_SUPPORT

  FILE *ifile;
  char line[STRINGMAX], token[STRINGMAX], tmpbuf[STRINGMAX];
  char *cptr;
  int i, done;
  struct config_line *lptr;

  linecount = 0;
  curfilename = filename;
  
  if ((ifile = fopen(filename, "r")) == NULL) {
#ifdef ENOENT
    if (errno == ENOENT) {
      DEBUGMSGTL(("read_config", "%s: %s\n", filename, strerror(errno)));
    } else
#endif /* ENOENT */
#ifdef EACCES
    if (errno == EACCES) {
      DEBUGMSGTL(("read_config", "%s: %s\n", filename, strerror(errno)));
    } else
#endif /* EACCES */
#if defined(ENOENT) || defined(EACCES)
    {
      snmp_log_perror(filename);
    }
#else /* defined(ENOENT) || defined(EACCES) */
    snmp_log_perror(filename);
#endif /* ENOENT */
    return;
  } else {
    DEBUGMSGTL(("read_config", "Reading configuration %s\n", filename));
  }

  while (fgets(line, sizeof(line), ifile) != NULL) 
    {
      lptr = line_handler;
      linecount++;
      cptr = line;
      i = strlen(line)-1;
      if (line[i] == '\n')
        line[i] = 0;
      /* check blank line or # comment */
      if ((cptr = skip_white(cptr)))
	{
          cptr = copy_word(cptr,token);
          if (cptr == NULL) {
            sprintf(tmpbuf,"Blank line following %s token.", token);
            config_perror(tmpbuf);
          } else {
            for(lptr = line_handler, done=0;
                lptr != NULL && !done;
                lptr = lptr->next) {
              if (!strcasecmp(token,lptr->config_token)) {
                if (when == EITHER_CONFIG || lptr->config_time == when) {
                    DEBUGMSGTL(("read_config", "%s:%d Parsing: %s\n",
                                filename, linecount, line));
                    (*(lptr->parse_line))(token,cptr);
                }
                done = 1;
              }
            }
            if (!done && when != PREMIB_CONFIG &&
                !ds_get_boolean(DS_LIBRARY_ID, DS_LIB_NO_TOKEN_WARNINGS)) {
              sprintf(tmpbuf,"Unknown token: %s.", token);
              config_pwarn(tmpbuf);
            }
          }
	}
    }
  fclose(ifile);
#endif
  return;

}  /* end read_config() */



void
free_config (void)
{
  struct config_files *ctmp = config_files;
  struct config_line *ltmp;

  for(;ctmp != NULL; ctmp = ctmp->next)
    for(ltmp = ctmp->start; ltmp != NULL; ltmp = ltmp->next)
      if (ltmp->free_func)
        (*(ltmp->free_func))();
}

void
read_configs (void)
{

  char *optional_config = ds_get_string(DS_LIBRARY_ID, DS_LIB_OPTIONALCONFIG);
  char *type = ds_get_string(DS_LIBRARY_ID, DS_LIB_APPTYPE);

  DEBUGMSGTL(("read_config","reading normal configuration tokens\n"));
  
  if (!ds_get_boolean(DS_LIBRARY_ID, DS_LIB_DONT_READ_CONFIGS))
    read_config_files(NORMAL_CONFIG);

 /* do this even when the normal above wasn't done */
  if (optional_config && type)
    read_config_with_type(optional_config, type);

  snmp_call_callbacks(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_POST_READ_CONFIG,
                      NULL);
}

void
read_premib_configs (void)
{
  DEBUGMSGTL(("read_config","reading premib configuration tokens\n"));

  if (!ds_get_boolean(DS_LIBRARY_ID, DS_LIB_DONT_READ_CONFIGS))
    read_config_files(PREMIB_CONFIG);

  snmp_call_callbacks(SNMP_CALLBACK_LIBRARY,
                      SNMP_CALLBACK_POST_PREMIB_READ_CONFIG,
                      NULL);
}




/*******************************************************************-o-******
 * read_config_files
 *
 * Parameters:
 *	when	== PREMIB_CONFIG, NORMAL_CONFIG  -or-  EITHER_CONFIG
 *
 *
 * Traverse the list of config file types, performing the following actions
 * for each --
 *
 * First, build a search path for config files.  If the contents of 
 * environment variable SNMPCONFPATH are NULL, then use the following
 * path list (where the last entry exists only if HOME is non-null):
 *
 *	SNMPSHAREPATH:SNMPLIBPATH:${HOME}/.snmp
 *
 * Then, In each of these directories, read config files by the name of:
 *
 *	<dir>/<fileHeader>.conf		-AND-
 *	<dir>/<fileHeader>.local.conf
 *
 * where <fileHeader> is taken from the config file type structure.
 *
 *
 * PREMIB_CONFIG causes free_config() to be invoked prior to any other action.
 *
 *
 * EXITs if any 'config_errors' are logged while parsing config file lines.
 */
void
read_config_files (int when)
{
#ifdef CYGPKG_SNMPLIB_FILESYSTEM_SUPPORT

  int i, j;
  char configfile[300];
  char *envconfpath, *homepath;
  char *cptr1, *cptr2;
  char defaultPath[SPRINT_MAX_LEN];

  struct config_files *ctmp = config_files;
  struct config_line *ltmp;
  struct stat statbuf;
  
  if (when == PREMIB_CONFIG)
    free_config();

  /* read all config file types */
  for(;ctmp != NULL; ctmp = ctmp->next) {

    ltmp = ctmp->start;

    /* read the config files */
    if ((envconfpath = getenv("SNMPCONFPATH")) == NULL) {
      homepath=getenv("HOME");
      sprintf(defaultPath,"%s%c%s%c%s%s%s%s%c%s",
	      SNMPCONFPATH, ENV_SEPARATOR_CHAR,
              SNMPSHAREPATH, ENV_SEPARATOR_CHAR, SNMPLIBPATH,
              ((homepath == NULL) ? "" : ENV_SEPARATOR),
              ((homepath == NULL) ? "" : homepath),
              ((homepath == NULL) ? "" : "/.snmp"),
              ENV_SEPARATOR_CHAR, PERSISTENT_DIRECTORY);
      envconfpath = defaultPath;
    }
    envconfpath = strdup(envconfpath);  /* prevent actually writing in env */
    DEBUGMSGTL(("read_config","config path used:%s\n", envconfpath));
    cptr1 = cptr2 = envconfpath;
    i = 1;
    while (i && *cptr2 != 0) {
      while(*cptr1 != 0 && *cptr1 != ENV_SEPARATOR_CHAR)
        cptr1++;
      if (*cptr1 == 0)
        i = 0;
      else
        *cptr1 = 0;
      /*
       * for proper persistent storage retrival, we need to read old backup
       * copies of the previous storage files.  If the application in
       * question has died without the proper call to snmp_clean_persistent,
       * then we read all the configuration files we can, starting with
       * the oldest first.
       */
#ifdef CYGPKG_SNMPLIB_PERSISTENT_FILESYSTEM
      if (strncmp(cptr2, PERSISTENT_DIRECTORY,
                  strlen(PERSISTENT_DIRECTORY)) == 0 ||
          (getenv("SNMP_PERSISTENT_FILE") != NULL &&
           strncmp(cptr2, getenv("SNMP_PERSISTENT_FILE"),
                   strlen(getenv("SNMP_PERSISTENT_FILE"))) == 0)) {
        /* limit this to the known storage directory only */
        for(j=0; j <= MAX_PERSISTENT_BACKUPS; j++) {
          sprintf(configfile,"%s/%s.%d.conf",cptr2, ctmp->fileHeader, j);
          if (stat(configfile, &statbuf) != 0) {
            /* file not there, continue */
            break;
          } else {
            /* backup exists, read it */
            DEBUGMSGTL(("read_config_files","old config file found: %s, parsing\n", configfile));
            read_config (configfile, ltmp, when);
          }
        }
      }
#endif
      sprintf(configfile,"%s/%s.conf",cptr2, ctmp->fileHeader);
      read_config (configfile, ltmp, when);
      sprintf(configfile,"%s/%s.local.conf",cptr2, ctmp->fileHeader);
      read_config (configfile, ltmp, when);
      cptr2 = ++cptr1;
    }
    free(envconfpath);
  }
  
#ifdef CYGPKG_SNMPLIB_PERSISTENT_FILESYSTEM
  if (config_errors) {
    snmp_log(LOG_ERR, "ucd-snmp: %d errors in config file\n", config_errors);
/*    exit(1); */
  }
#endif
#endif
}

void read_config_print_usage(const char *lead)
{
  struct config_files *ctmp = config_files;
  struct config_line *ltmp;

  if (lead == NULL)
    lead = "";

  for(ctmp = config_files; ctmp != NULL; ctmp = ctmp->next) {
    snmp_log(LOG_INFO, "%sIn %s.conf and %s.local.conf:\n", lead, ctmp->fileHeader,
            ctmp->fileHeader);
    for(ltmp = ctmp->start; ltmp != NULL; ltmp = ltmp->next) {
      if (ltmp->help != NULL)
        snmp_log(LOG_INFO, "%s%s%-15s %s\n", lead, lead, ltmp->config_token,
                 ltmp->help);
    }
  }
}

/*******************************************************************-o-******
 * read_config_store
 *
 * Parameters:
 *	*type
 *	*line
 *      
 * 
 * Append line to a file named either ENV(SNMP_PERSISTENT_FILE) or
 *   "<PERSISTENT_DIRECTORY>/<type>.conf".
 * Add a trailing newline to the stored file if necessary.
 *
 * Intended for use by applications to store permenant configuration 
 * information generated by sets or persistent counters.
 *
 */
void
read_config_store(const char *type, const char *line)
{
#ifdef CYGPKG_SNMPLIB_PERSISTENT_FILESYSTEM
  char file[512], *filep;
  FILE *fout;
#ifdef PERSISTENT_MASK
  mode_t oldmask;
#endif

  /* store configuration directives in the following order of preference:
     1. ENV variable SNMP_PERSISTENT_FILE
     2. configured <PERSISTENT_DIRECTORY>/<type>.conf
  */
  if ((filep = getenv("SNMP_PERSISTENT_FILE")) == NULL) {
    sprintf(file,"%s/%s.conf",PERSISTENT_DIRECTORY,type);
    filep = file;
  }
  
#ifdef PERSISTENT_MASK
  oldmask = umask(PERSISTENT_MASK);
#endif
  if (mkdirhier(filep, AGENT_DIRECTORY_MODE, 1)) {
      snmp_log(LOG_ERR, "Failed to create the persistent directory for %s\n",
               file);
  }
  if ((fout = fopen(filep, "a")) != NULL) {
    fprintf(fout,line);
    if (line[strlen(line)] != '\n')
      fprintf(fout,"\n");
    DEBUGMSGTL(("read_config","storing: %s\n",line));
    fclose(fout);
  } else {
    DEBUGMSGTL(("read_config","open failure"));
  }
#ifdef PERSISTENT_MASK
  umask(oldmask);
#endif

#endif
}  /* end read_config_store() */

void
read_app_config_store(const char *line)
{
  read_config_store(ds_get_string(DS_LIBRARY_ID, DS_LIB_APPTYPE), line);
}




/*******************************************************************-o-******
 * snmp_save_persistent
 *
 * Parameters:
 *	*type
 *      
 *
 * Save the file "<PERSISTENT_DIRECTORY>/<type>.conf" into a backup copy
 * called "<PERSISTENT_DIRECTORY>/<type>.%d.conf", which %d is an
 * incrementing number on each call, but less than MAX_PERSISTENT_BACKUPS.
 *
 * Should be called just before all persistent information is supposed to be
 * written to move aside the existing persistent cache.
 * snmp_clean_persistent should then be called afterward all data has been
 * saved to remove these backup files.
 *
 * Note: on an rename error, the files are removed rather than saved.
 *
 */
void
snmp_save_persistent(const char *type)
{
#ifndef ECOSFIXME_NEEDFILESYSTEM

  char file[512], fileold[512];
  struct stat statbuf;
  int j;

  DEBUGMSGTL(("snmp_save_persistent","saving %s files...\n", type));
  sprintf(file,"%s/%s.conf", PERSISTENT_DIRECTORY, type);
  if (stat(file, &statbuf) == 0) {