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config_file.c

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/*
 * util/config_file.c - reads and stores the config file for unbound.
 *
 * Copyright (c) 2007, NLnet Labs. All rights reserved.
 *
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the NLNET LABS nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * \file
 *
 * This file contains functions for the config file.
 */

#include "config.h"
#include "util/log.h"

#include "util/configyyrename.h"
#include "util/config_file.h"
#include "util/configparser.h"
#include "util/net_help.h"
/** global config during parsing */
00050 struct config_parser_state* cfg_parser = 0;
/** lex in file */
extern FILE* ub_c_in;
/** lex out file */
extern FILE* ub_c_out;
/** the yacc lex generated parse function */
int ub_c_parse(void);
/** the lexer function */
int ub_c_lex(void);
/** wrap function */
int ub_c_wrap(void);
/** print error with file and line number */
void ub_c_error(const char *message);

/** init ports possible for use */
static void init_outgoing_availports(int* array, int num);

struct config_file* 
00068 config_create()
{
      struct config_file* cfg;
      cfg = (struct config_file*)calloc(1, sizeof(struct config_file));
      if(!cfg)
            return NULL;
      /* the defaults if no config is present */
      cfg->verbosity = 1;
      cfg->stat_interval = 0;
      cfg->stat_cumulative = 0;
      cfg->num_threads = 1;
      cfg->port = UNBOUND_DNS_PORT;
      cfg->do_ip4 = 1;
      cfg->do_ip6 = 1;
      cfg->do_udp = 1;
      cfg->do_tcp = 1;
      cfg->use_syslog = 1;
      cfg->outgoing_num_ports = 256;
      cfg->outgoing_num_tcp = 10;
      cfg->incoming_num_tcp = 10;
      cfg->msg_buffer_size = 65552; /* 64 k + a small margin */
      cfg->msg_cache_size = 4 * 1024 * 1024;
      cfg->msg_cache_slabs = 4;
      cfg->num_queries_per_thread = 1024;
      cfg->rrset_cache_size = 4 * 1024 * 1024;
      cfg->rrset_cache_slabs = 4;
      cfg->host_ttl = 900;
      cfg->lame_ttl = 900;
      cfg->bogus_ttl = 900;
      cfg->max_ttl = 3600 * 24;
      cfg->infra_cache_slabs = 4;
      cfg->infra_cache_numhosts = 10000;
      cfg->infra_cache_lame_size = 10240; /* easily 40 or more entries */
      if(!(cfg->outgoing_avail_ports = (int*)calloc(65536, sizeof(int))))
            goto error_exit;
      init_outgoing_availports(cfg->outgoing_avail_ports, 65536);
      if(!(cfg->username = strdup("unbound"))) goto error_exit;
      if(!(cfg->chrootdir = strdup(CHROOT_DIR))) goto error_exit;
      if(!(cfg->directory = strdup(RUN_DIR))) goto error_exit;
      if(!(cfg->logfile = strdup(""))) goto error_exit;
      if(!(cfg->pidfile = strdup(PIDFILE))) goto error_exit;
      if(!(cfg->target_fetch_policy = strdup("3 2 1 0 0"))) goto error_exit;
      cfg->donotqueryaddrs = NULL;
      cfg->donotquery_localhost = 1;
      cfg->root_hints = NULL;
      cfg->do_daemonize = 1;
      cfg->if_automatic = 0;
      cfg->num_ifs = 0;
      cfg->ifs = NULL;
      cfg->num_out_ifs = 0;
      cfg->out_ifs = NULL;
      cfg->stubs = NULL;
      cfg->forwards = NULL;
      cfg->acls = NULL;
      cfg->harden_short_bufsize = 0;
      cfg->harden_large_queries = 0;
      cfg->harden_glue = 1;
      cfg->harden_dnssec_stripped = 1;
      cfg->use_caps_bits_for_id = 0;
      cfg->hide_identity = 0;
      cfg->hide_version = 0;
      cfg->identity = NULL;
      cfg->version = NULL;
      cfg->trust_anchor_file_list = NULL;
      cfg->trust_anchor_list = NULL;
      cfg->trusted_keys_file_list = NULL;
      cfg->val_date_override = 0;
      cfg->val_clean_additional = 1;
      cfg->val_permissive_mode = 0;
      cfg->key_cache_size = 4 * 1024 * 1024;
      cfg->key_cache_slabs = 4;
      cfg->local_zones = NULL;
      cfg->local_zones_nodefault = NULL;
      cfg->local_data = NULL;
      if(!(cfg->module_conf = strdup("validator iterator"))) goto error_exit;
      if(!(cfg->val_nsec3_key_iterations = 
            strdup("1024 150 2048 500 4096 2500"))) goto error_exit;
      return cfg;
error_exit:
      config_delete(cfg); 
      return NULL;
}

00151 struct config_file* config_create_forlib()
{
      struct config_file* cfg = config_create();
      if(!cfg) return NULL;
      /* modifications for library use, less verbose, less memory */
      free(cfg->chrootdir);
      cfg->chrootdir = NULL;
      cfg->verbosity = 0;
      cfg->outgoing_num_ports = 16; /* in library use, this is 'reasonable'
            and probably within the ulimit(maxfds) of the user */
      cfg->outgoing_num_tcp = 2;
      cfg->msg_cache_size = 1024*1024;
      cfg->msg_cache_slabs = 1;
      cfg->rrset_cache_size = 1024*1024;
      cfg->rrset_cache_slabs = 1;
      cfg->infra_cache_slabs = 1;
      cfg->use_syslog = 0;
      cfg->key_cache_size = 1024*1024;
      cfg->key_cache_slabs = 1;
      cfg->donotquery_localhost = 0; /* allow, so that you can ask a
            forward nameserver running on localhost */
      return cfg;
}

/** check that the value passed is >= 0 */
00176 #define IS_NUMBER_OR_ZERO \
      if(atoi(val) == 0 && strcmp(val, "0") != 0) return 0
/** check that the value passed is > 0 */
00179 #define IS_NONZERO_NUMBER \
      if(atoi(val) == 0) return 0
/** check that the value passed is not 0 and a power of 2 */
00182 #define IS_POW2_NUMBER \
      if(atoi(val) == 0 || !is_pow2((size_t)atoi(val))) return 0
/** check that the value passed is yes or no */
00185 #define IS_YES_OR_NO \
      if(strcmp(val, "yes") != 0 && strcmp(val, "no") != 0) return 0

00188 int config_set_option(struct config_file* cfg, const char* opt,
        const char* val)
{
      if(strcmp(opt, "verbosity:") == 0) {
            IS_NUMBER_OR_ZERO;
            cfg->verbosity = atoi(val);
      } else if(strcmp(opt, "statistics-interval:") == 0) {
            if(strcmp(val, "0") == 0 || strcmp(val, "") == 0)
                  cfg->stat_interval = 0;
            else if(atoi(val) == 0)
                  return 0;
            else cfg->stat_interval = atoi(val);
      } else if(strcmp(opt, "num_threads:") == 0) {
            /* not supported, library must have 1 thread in bgworker */
            return 0;
      } else if(strcmp(opt, "do-ip4:") == 0) {
            IS_YES_OR_NO;
            cfg->do_ip4 = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "do-ip6:") == 0) {
            IS_YES_OR_NO;
            cfg->do_ip6 = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "do-udp:") == 0) {
            IS_YES_OR_NO;
            cfg->do_udp = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "do-tcp:") == 0) {
            IS_YES_OR_NO;
            cfg->do_tcp = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "outgoing-range:") == 0) {
            IS_NONZERO_NUMBER;
            cfg->outgoing_num_ports = atoi(val);
      } else if(strcmp(opt, "outgoing-port-permit:") == 0) {
            return cfg_mark_ports(val, 1, 
                  cfg->outgoing_avail_ports, 65536);
      } else if(strcmp(opt, "outgoing-port-avoid:") == 0) {
            return cfg_mark_ports(val, 0, 
                  cfg->outgoing_avail_ports, 65536);
      } else if(strcmp(opt, "outgoing-num-tcp:") == 0) {
            IS_NUMBER_OR_ZERO;
            cfg->outgoing_num_tcp = (size_t)atoi(val);
      } else if(strcmp(opt, "incoming-num-tcp:") == 0) {
            IS_NUMBER_OR_ZERO;
            cfg->incoming_num_tcp = (size_t)atoi(val);
      } else if(strcmp(opt, "msg-buffer-size:") == 0) {
            IS_NONZERO_NUMBER;
            cfg->msg_buffer_size = (size_t)atoi(val);
      } else if(strcmp(opt, "msg-cache-size:") == 0) {
            return cfg_parse_memsize(val, &cfg->msg_cache_size);
      } else if(strcmp(opt, "msg-cache-slabs:") == 0) {
            IS_POW2_NUMBER;
            cfg->msg_cache_slabs = (size_t)atoi(val);
      } else if(strcmp(opt, "num-queries-per-thread:") == 0) {
            IS_NONZERO_NUMBER;
            cfg->num_queries_per_thread = (size_t)atoi(val);
      } else if(strcmp(opt, "rrset-cache-size:") == 0) {
            return cfg_parse_memsize(val, &cfg->rrset_cache_size);
      } else if(strcmp(opt, "rrset-cache-slabs:") == 0) {
            IS_POW2_NUMBER;
            cfg->rrset_cache_slabs = (size_t)atoi(val);
      } else if(strcmp(opt, "cache-max-ttl:") == 0) {
            IS_NUMBER_OR_ZERO;
            cfg->max_ttl = atoi(val);
      } else if(strcmp(opt, "infra-host-ttl:") == 0) {
            IS_NUMBER_OR_ZERO;
            cfg->host_ttl = atoi(val);
      } else if(strcmp(opt, "infra-lame-ttl:") == 0) {
            IS_NUMBER_OR_ZERO;
            cfg->lame_ttl = atoi(val);
      } else if(strcmp(opt, "infra-cache-slabs:") == 0) {
            IS_POW2_NUMBER;
            cfg->infra_cache_slabs = (size_t)atoi(val);
      } else if(strcmp(opt, "infra-cache-numhosts:") == 0) {
            IS_NONZERO_NUMBER;
            cfg->infra_cache_numhosts = (size_t)atoi(val);
      } else if(strcmp(opt, "infra-cache-lame-size:") == 0) {
            return cfg_parse_memsize(val, &cfg->infra_cache_lame_size);
      } else if(strcmp(opt, "logfile:") == 0) {
            cfg->use_syslog = 0;
            free(cfg->logfile);
            return (cfg->logfile = strdup(val)) != NULL;
      } else if(strcmp(opt, "use-syslog:") == 0) {
            IS_YES_OR_NO;
            cfg->use_syslog = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "root-hints:") == 0) {
            return cfg_strlist_insert(&cfg->root_hints, strdup(val));
      } else if(strcmp(opt, "target-fetch-policy:") == 0) {
            free(cfg->target_fetch_policy);
            return (cfg->target_fetch_policy = strdup(val)) != NULL;
      } else if(strcmp(opt, "harden-glue:") == 0) {
            IS_YES_OR_NO;
            cfg->harden_glue = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "harden-short-bufsize:") == 0) {
            IS_YES_OR_NO;
            cfg->harden_short_bufsize = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "harden-large-queries:") == 0) {
            IS_YES_OR_NO;
            cfg->harden_large_queries = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "harden-dnssec-stripped:") == 0) {
            IS_YES_OR_NO;
            cfg->harden_dnssec_stripped = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "do-not-query-localhost:") == 0) {
            IS_YES_OR_NO;
            cfg->donotquery_localhost = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "do-not-query-address:") == 0) {
            return cfg_strlist_insert(&cfg->donotqueryaddrs, strdup(val));
      } else if(strcmp(opt, "trust-anchor-file:") == 0) {
            return cfg_strlist_insert(&cfg->trust_anchor_file_list, 
                  strdup(val));
      } else if(strcmp(opt, "trust-anchor:") == 0) {
            return cfg_strlist_insert(&cfg->trust_anchor_list, 
                  strdup(val));
      } else if(strcmp(opt, "trusted-keys-file:") == 0) {
            return cfg_strlist_insert(&cfg->trusted_keys_file_list, 
                  strdup(val));
      } else if(strcmp(opt, "val-override-date:") == 0) {
            if(strcmp(val, "") == 0 || strcmp(val, "0") == 0) {
                  cfg->val_date_override = 0;
            } else if(strlen(val) == 14) {
                  cfg->val_date_override = cfg_convert_timeval(val);
                  return cfg->val_date_override != 0;
            } else {
                  if(atoi(val) == 0) return 0;
                  cfg->val_date_override = (uint32_t)atoi(val);
            }
      } else if(strcmp(opt, "val-bogus-ttl:") == 0) {
            IS_NUMBER_OR_ZERO;
            cfg->bogus_ttl = atoi(val);
      } else if(strcmp(opt, "val-clean-additional:") == 0) {
            IS_YES_OR_NO;
            cfg->val_clean_additional = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "val-permissive-mode:") == 0) {
            IS_YES_OR_NO;
            cfg->val_permissive_mode = (strcmp(val, "yes") == 0);
      } else if(strcmp(opt, "val-nsec3-keysize-iterations:") == 0) {
            free(cfg->val_nsec3_key_iterations);
            return (cfg->val_nsec3_key_iterations = strdup(val)) != NULL;
      } else if(strcmp(opt, "key-cache-size:") == 0) {
            return cfg_parse_memsize(val, &cfg->key_cache_size);
      } else if(strcmp(opt, "key-cache-slabs:") == 0) {
            IS_POW2_NUMBER;
            cfg->key_cache_slabs = (size_t)atoi(val);
      } else if(strcmp(opt, "local-data:") == 0) {
            return cfg_strlist_insert(&cfg->local_data, strdup(val));
      } else if(strcmp(opt, "module-config:") == 0) {
            free(cfg->module_conf);
            return (cfg->module_conf = strdup(val)) != NULL;
      } else {
            /* unknown or unsupported (from the library interface) */
            return 0;
      }
      return 1;
}

/** initialize the global cfg_parser object */
static void
00342 create_cfg_parser(struct config_file* cfg, char* filename)
{
      static struct config_parser_state st;
      cfg_parser = &st;
      cfg_parser->filename = filename;
      cfg_parser->line = 1;
      cfg_parser->errors = 0;
      cfg_parser->cfg = cfg;
}

int 
00353 config_read(struct config_file* cfg, char* filename)
{
      FILE *in;
      if(!filename)
            return 1;
      in = fopen(filename, "r");
      if(!in) {
            log_err("Could not open %s: %s", filename, strerror(errno));
            return 0;
      }
      create_cfg_parser(cfg, filename);
      ub_c_in = in;
      ub_c_parse();
      fclose(in);

      if(cfg_parser->errors != 0) {
            fprintf(stderr, "read %s failed: %d errors in configuration file\n",
                  cfg_parser->filename, cfg_parser->errors);
            errno=EINVAL;
            return 0;
      }
      return 1;
}

void
00378 config_delstrlist(struct config_strlist* p)
{
      struct config_strlist *np;
      while(p) {
            np = p->next;
            free(p->str);
            free(p);
            p = np;
      }
}

void
00390 config_deldblstrlist(struct config_str2list* p)
{
      struct config_str2list *np;
      while(p) {
            np = p->next;
            free(p->str);
            free(p->str2);
            free(p);
            p = np;
      }
}

void
00403 config_delstubs(struct config_stub* p)
{
      struct config_stub* np;
      while(p) {
            np = p->next;
            free(p->name);
            config_delstrlist(p->hosts);
            config_delstrlist(p->addrs);
            free(p);
            p = np;
      }
}

void 
00417 config_delete(struct config_file* cfg)
{
      if(!cfg) return;
      free(cfg->username);
      free(cfg->chrootdir);
      free(cfg->directory);
      free(cfg->logfile);
      free(cfg->pidfile);
      free(cfg->target_fetch_policy);
      if(cfg->ifs) {
            int i;
            for(i=0; i<cfg->num_ifs; i++)
                  free(cfg->ifs[i]);
            free(cfg->ifs);
      }
      if(cfg->out_ifs) {
            int i;
            for(i=0; i<cfg->num_out_ifs; i++)
                  free(cfg->out_ifs[i]);
            free(cfg->out_ifs);
      }
      config_delstubs(cfg->stubs);
      config_delstubs(cfg->forwards);
      config_delstrlist(cfg->donotqueryaddrs);
      config_delstrlist(cfg->root_hints);
      free(cfg->identity);
      free(cfg->version);
      free(cfg->module_conf);
      free(cfg->outgoing_avail_ports);
      config_delstrlist(cfg->trust_anchor_file_list);
      config_delstrlist(cfg->trusted_keys_file_list);
      config_delstrlist(cfg->trust_anchor_list);
      config_deldblstrlist(cfg->acls);
      free(cfg->val_nsec3_key_iterations);
      config_deldblstrlist(cfg->local_zones);
      config_delstrlist(cfg->local_zones_nodefault);
      config_delstrlist(cfg->local_data);
      free(cfg);
}

static void 
00458 init_outgoing_availports(int* a, int num)
{
      /* generated with make iana_update */
      const int iana_assigned[] = {
#include "util/iana_ports.inc"
            -1 }; /* end marker to put behind trailing comma */

      int i;
      /* do not use <1024, that could be trouble with the system, privs */
      for(i=1024; i<num; i++) {
            a[i] = i;
      }
      /* create empty spot at 49152 to keep ephemeral ports available 
       * to other programs */
      for(i=49152; i<49152+256; i++)
            a[i] = 0;
      /* pick out all the IANA assigned ports */
      for(i=0; iana_assigned[i]!=-1; i++) {
            if(iana_assigned[i] < num)
                  a[iana_assigned[i]] = 0;
      }
}

int 
00482 cfg_mark_ports(const char* str, int allow, int* avail, int num)
{
      char* mid = strchr(str, '-');
      if(!mid) {
            int port = atoi(str);
            if(port == 0 && strcmp(str, "0") != 0) {
                  log_err("cannot parse port number '%s'", str);
                  return 0;
            }
            if(port < num)
                  avail[port] = (allow?port:0);
      } else {
            int i, low, high = atoi(mid+1);
            char buf[16];
            if(high == 0 && strcmp(mid+1, "0") != 0) {
                  log_err("cannot parse port number '%s'", mid+1);
                  return 0;
            }
            if( (int)(mid-str)+1 >= (int)sizeof(buf) ) {
                  log_err("cannot parse port number '%s'", str);
                  return 0;
            }
            if(mid > str)
                  memcpy(buf, str, (size_t)(mid-str));
            buf[mid-str] = 0;
            low = atoi(buf);
            if(low == 0 && strcmp(buf, "0") != 0) {
                  log_err("cannot parse port number '%s'", buf);
                  return 0;
            }
            for(i=low; i<=high; i++) {
                  if(i < num)
                        avail[i] = (allow?i:0);
            }
            return 1;
      }
      return 1;
}

int 
00522 cfg_scan_ports(int* avail, int num)
{
      int i;
      int count = 0;
      for(i=0; i<num; i++) {
            if(avail[i])
                  count++;
      }
      return count;
}

00533 int cfg_condense_ports(struct config_file* cfg, int** avail)
{
      int num = cfg_scan_ports(cfg->outgoing_avail_ports, 65536);
      int i, at = 0;
      *avail = NULL;
      if(num == 0)
            return 0;
      *avail = (int*)malloc(sizeof(int)*num);
      if(!*avail)
            return 0;
      for(i=0; i<65536; i++) {
            if(cfg->outgoing_avail_ports[i])
                  (*avail)[at++] = cfg->outgoing_avail_ports[i];
      }
      log_assert(at == num);
      return num;
}

/** print error with file and line number */
00552 void ub_c_error_va_list(const char *fmt, va_list args)
{
      cfg_parser->errors++;
      fprintf(stderr, "%s:%d: error: ", cfg_parser->filename,
      cfg_parser->line);
      vfprintf(stderr, fmt, args);
      fprintf(stderr, "\n");
}

/** print error with file and line number */
00562 void ub_c_error_msg(const char* fmt, ...)
{
      va_list args;
      va_start(args, fmt);
      ub_c_error_va_list(fmt, args);
      va_end(args);
}

00570 void ub_c_error(const char *str)
{
      cfg_parser->errors++;
      fprintf(stderr, "%s:%d: error: %s\n", cfg_parser->filename,
            cfg_parser->line, str);
}

00577 int ub_c_wrap()
{
      return 1;
}

int 
00583 cfg_strlist_insert(struct config_strlist** head, char* item)
{
      struct config_strlist *s;
      if(!item || !head)
            return 0;
      s = (struct config_strlist*)calloc(1, sizeof(struct config_strlist));
      if(!s)
            return 0;
      s->str = item;
      s->next = *head;
      *head = s;
      return 1;
}

int 
00598 cfg_str2list_insert(struct config_str2list** head, char* item, char* i2)
{
      struct config_str2list *s;
      if(!item || !i2 || !head)
            return 0;
      s = (struct config_str2list*)calloc(1, sizeof(struct config_str2list));
      if(!s)
            return 0;
      s->str = item;
      s->str2 = i2;
      s->next = *head;
      *head = s;
      return 1;
}

uint32_t 
00614 cfg_convert_timeval(const char* str)
{
      uint32_t t;
      struct tm tm;
      memset(&tm, 0, sizeof(tm));
      if(strlen(str) < 14)
            return 0;
      if(sscanf(str, "%4d%2d%2d%2d%2d%2d", &tm.tm_year, &tm.tm_mon, 
            &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6)
            return 0;
      tm.tm_year -= 1900;
      tm.tm_mon--;
      /* Check values */
      if (tm.tm_year < 70)    return 0;
      if (tm.tm_mon < 0 || tm.tm_mon > 11)      return 0;
      if (tm.tm_mday < 1 || tm.tm_mday > 31)    return 0;
      if (tm.tm_hour < 0 || tm.tm_hour > 23)    return 0;
      if (tm.tm_min < 0 || tm.tm_min > 59)      return 0;
      if (tm.tm_sec < 0 || tm.tm_sec > 59)      return 0;
      /* call ldns conversion function */
      t = mktime_from_utc(&tm);
      return t;
}

int 
00639 cfg_count_numbers(const char* s)
{
        /* format ::= (sp num)+ sp      */
        /* num ::= [-](0-9)+            */
        /* sp ::= (space|tab)*          */
        int num = 0;
        while(*s) {
                while(*s && isspace((int)*s))
                        s++;
                if(!*s) /* end of string */
                        break;
                if(*s == '-')
                        s++;
                if(!*s) /* only - not allowed */
                        return 0;
                if(!isdigit((int)*s)) /* bad character */
                        return 0;
                while(*s && isdigit((int)*s))
                        s++;
                num++;
        }
        return num;
}

/** all digit number */
00664 static int isalldigit(const char* str, size_t l)
{
      size_t i;
      for(i=0; i<l; i++)
            if(!isdigit(str[i]))
                  return 0;
      return 1;
}

int 
00674 cfg_parse_memsize(const char* str, size_t* res)
{
      size_t len = (size_t)strlen(str);
      size_t mult = 1;
      if(!str || len == 0) {
            log_err("not a size: '%s'", str);
            return 0;
      }
      if(isalldigit(str, len)) {
            *res = (size_t)atol(str);
            return 1;
      }
      /* check appended num */
      while(len>0 && str[len-1]==' ')
            len--;
      if(len > 1 && str[len-1] == 'b') 
            len--;
      else if(len > 1 && str[len-1] == 'B') 
            len--;
      
      if(len > 1 && tolower(str[len-1]) == 'g')
            mult = 1024*1024*1024;
      else if(len > 1 && tolower(str[len-1]) == 'm')
            mult = 1024*1024;
      else if(len > 1 && tolower(str[len-1]) == 'k')
            mult = 1024;
      else if(len > 0 && isdigit(str[len-1]))
            mult = 1;
      else {
            log_err("unknown size specifier: '%s'", str);
            return 0;
      }
      while(len>1 && str[len-2]==' ')
            len--;

      if(!isalldigit(str, len-1)) {
            log_err("unknown size specifier: '%s'", str);
            return 0;
      }
      *res = ((size_t)atol(str)) * mult;
      return 1;
}

/** the MAX_TTL global */
extern uint32_t MAX_TTL;

void 
00721 config_apply(struct config_file* config)
{
      MAX_TTL = (uint32_t)config->max_ttl;
}


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