src/option.c

/* dnsmasq is Copyright (c) 2000-2012 Simon Kelley

   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; version 2 dated June, 1991, or
   (at your option) version 3 dated 29 June, 2007.
 
   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, see <http://www.gnu.org/licenses/>.
*/

/* define this to get facilitynames */
#define SYSLOG_NAMES
#include "dnsmasq.h"
#include <setjmp.h>

static volatile int mem_recover = 0;
static jmp_buf mem_jmp;
static void one_file(char *file, int hard_opt);

/* Solaris headers don't have facility names. */
#ifdef HAVE_SOLARIS_NETWORK
static const struct {
  char *c_name;
  unsigned int c_val;
}  facilitynames[] = {
  { "kern",   LOG_KERN },
  { "user",   LOG_USER },
  { "mail",   LOG_MAIL },
  { "daemon", LOG_DAEMON },
  { "auth",   LOG_AUTH },
  { "syslog", LOG_SYSLOG },
  { "lpr",    LOG_LPR },
  { "news",   LOG_NEWS },
  { "uucp",   LOG_UUCP },
  { "audit",  LOG_AUDIT },
  { "cron",   LOG_CRON },
  { "local0", LOG_LOCAL0 },
  { "local1", LOG_LOCAL1 },
  { "local2", LOG_LOCAL2 },
  { "local3", LOG_LOCAL3 },
  { "local4", LOG_LOCAL4 },
  { "local5", LOG_LOCAL5 },
  { "local6", LOG_LOCAL6 },
  { "local7", LOG_LOCAL7 },
  { NULL, 0 }
};
#endif

#ifndef HAVE_GETOPT_LONG
struct myoption {
  const char *name;
  int has_arg;
  int *flag;
  int val;
};
#endif

#define OPTSTRING "951yZDNLERKzowefnbvhdkqr:m:p:c:l:s:i:t:u:g:a:x:S:C:A:T:H:Q:I:B:F:G:O:M:X:V:U:j:P:J:W:Y:2:4:6:7:8:0:3:"

/* options which don't have a one-char version */
#define LOPT_RELOAD    256
#define LOPT_NO_NAMES  257
#define LOPT_TFTP      258
#define LOPT_SECURE    259
#define LOPT_PREFIX    260
#define LOPT_PTR       261
#define LOPT_BRIDGE    262
#define LOPT_TFTP_MAX  263
#define LOPT_FORCE     264
#define LOPT_NOBLOCK   265
#define LOPT_LOG_OPTS  266
#define LOPT_MAX_LOGS  267
#define LOPT_CIRCUIT   268
#define LOPT_REMOTE    269
#define LOPT_SUBSCR    270
#define LOPT_INTNAME   271
#define LOPT_BANK      272
#define LOPT_DHCP_HOST 273
#define LOPT_APREF     274
#define LOPT_OVERRIDE  275
#define LOPT_TFTPPORTS 276
#define LOPT_REBIND    277
#define LOPT_NOLAST    278
#define LOPT_OPTS      279
#define LOPT_DHCP_OPTS 280
#define LOPT_MATCH     281
#define LOPT_BROADCAST 282
#define LOPT_NEGTTL    283
#define LOPT_ALTPORT   284
#define LOPT_SCRIPTUSR 285
#define LOPT_LOCAL     286
#define LOPT_NAPTR     287
#define LOPT_MINPORT   288
#define LOPT_DHCP_FQDN 289
#define LOPT_CNAME     290
#define LOPT_PXE_PROMT 291
#define LOPT_PXE_SERV  292
#define LOPT_TEST      293
#define LOPT_TAG_IF    294
#define LOPT_PROXY     295
#define LOPT_GEN_NAMES 296
#define LOPT_MAXTTL    297
#define LOPT_NO_REBIND 298
#define LOPT_LOC_REBND 299
#define LOPT_ADD_MAC   300
#define LOPT_DNSSEC    301
#define LOPT_INCR_ADDR 302
#define LOPT_CONNTRACK 303
#define LOPT_FQDN      304
#define LOPT_LUASCRIPT 305

#ifdef HAVE_GETOPT_LONG
static const struct option opts[] =  
#else
static const struct myoption opts[] = 
#endif
  { 
    { "version", 0, 0, 'v' },
    { "no-hosts", 0, 0, 'h' },
    { "no-poll", 0, 0, 'n' },
    { "help", 0, 0, 'w' },
    { "no-daemon", 0, 0, 'd' },
    { "log-queries", 0, 0, 'q' },
    { "user", 2, 0, 'u' },
    { "group", 2, 0, 'g' },
    { "resolv-file", 2, 0, 'r' },
    { "mx-host", 1, 0, 'm' },
    { "mx-target", 1, 0, 't' },
    { "cache-size", 2, 0, 'c' },
    { "port", 1, 0, 'p' },
    { "dhcp-leasefile", 2, 0, 'l' },
    { "dhcp-lease", 1, 0, 'l' },
    { "dhcp-host", 1, 0, 'G' },
    { "dhcp-range", 1, 0, 'F' },
    { "dhcp-option", 1, 0, 'O' },
    { "dhcp-boot", 1, 0, 'M' },
    { "domain", 1, 0, 's' },
    { "domain-suffix", 1, 0, 's' },
    { "interface", 1, 0, 'i' },
    { "listen-address", 1, 0, 'a' },
    { "bogus-priv", 0, 0, 'b' },
    { "bogus-nxdomain", 1, 0, 'B' },
    { "selfmx", 0, 0, 'e' },
    { "filterwin2k", 0, 0, 'f' },
    { "pid-file", 2, 0, 'x' },
    { "strict-order", 0, 0, 'o' },
    { "server", 1, 0, 'S' },
    { "local", 1, 0, LOPT_LOCAL },
    { "address", 1, 0, 'A' },
    { "conf-file", 2, 0, 'C' },
    { "no-resolv", 0, 0, 'R' },
    { "expand-hosts", 0, 0, 'E' },
    { "localmx", 0, 0, 'L' },
    { "local-ttl", 1, 0, 'T' },
    { "no-negcache", 0, 0, 'N' },
    { "addn-hosts", 1, 0, 'H' },
    { "query-port", 1, 0, 'Q' },
    { "except-interface", 1, 0, 'I' },
    { "no-dhcp-interface", 1, 0, '2' },
    { "domain-needed", 0, 0, 'D' },
    { "dhcp-lease-max", 1, 0, 'X' },
    { "bind-interfaces", 0, 0, 'z' },
    { "read-ethers", 0, 0, 'Z' },
    { "alias", 1, 0, 'V' },
    { "dhcp-vendorclass", 1, 0, 'U' },
    { "dhcp-userclass", 1, 0, 'j' },
    { "dhcp-ignore", 1, 0, 'J' },
    { "edns-packet-max", 1, 0, 'P' },
    { "keep-in-foreground", 0, 0, 'k' },
    { "dhcp-authoritative", 0, 0, 'K' },
    { "srv-host", 1, 0, 'W' },
    { "localise-queries", 0, 0, 'y' },
    { "txt-record", 1, 0, 'Y' },
    { "enable-dbus", 0, 0, '1' },
    { "bootp-dynamic", 2, 0, '3' },
    { "dhcp-mac", 1, 0, '4' },
    { "no-ping", 0, 0, '5' },
    { "dhcp-script", 1, 0, '6' },
    { "conf-dir", 1, 0, '7' },
    { "log-facility", 1, 0 ,'8' },
    { "leasefile-ro", 0, 0, '9' },
    { "dns-forward-max", 1, 0, '0' },
    { "clear-on-reload", 0, 0, LOPT_RELOAD },
    { "dhcp-ignore-names", 2, 0, LOPT_NO_NAMES },
    { "enable-tftp", 2, 0, LOPT_TFTP },
    { "tftp-secure", 0, 0, LOPT_SECURE },
    { "tftp-unique-root", 0, 0, LOPT_APREF },
    { "tftp-root", 1, 0, LOPT_PREFIX },
    { "tftp-max", 1, 0, LOPT_TFTP_MAX },
    { "ptr-record", 1, 0, LOPT_PTR },
    { "naptr-record", 1, 0, LOPT_NAPTR },
    { "bridge-interface", 1, 0 , LOPT_BRIDGE },
    { "dhcp-option-force", 1, 0, LOPT_FORCE },
    { "tftp-no-blocksize", 0, 0, LOPT_NOBLOCK },
    { "log-dhcp", 0, 0, LOPT_LOG_OPTS },
    { "log-async", 2, 0, LOPT_MAX_LOGS },
    { "dhcp-circuitid", 1, 0, LOPT_CIRCUIT },
    { "dhcp-remoteid", 1, 0, LOPT_REMOTE },
    { "dhcp-subscrid", 1, 0, LOPT_SUBSCR },
    { "interface-name", 1, 0, LOPT_INTNAME },
    { "dhcp-hostsfile", 1, 0, LOPT_DHCP_HOST },
    { "dhcp-optsfile", 1, 0, LOPT_DHCP_OPTS },
    { "dhcp-no-override", 0, 0, LOPT_OVERRIDE },
    { "tftp-port-range", 1, 0, LOPT_TFTPPORTS },
    { "stop-dns-rebind", 0, 0, LOPT_REBIND },
    { "rebind-domain-ok", 1, 0, LOPT_NO_REBIND },
    { "all-servers", 0, 0, LOPT_NOLAST }, 
    { "dhcp-match", 1, 0, LOPT_MATCH }, 
    { "dhcp-broadcast", 2, 0, LOPT_BROADCAST },
    { "neg-ttl", 1, 0, LOPT_NEGTTL },
    { "max-ttl", 1, 0, LOPT_MAXTTL },
    { "dhcp-alternate-port", 2, 0, LOPT_ALTPORT },
    { "dhcp-scriptuser", 1, 0, LOPT_SCRIPTUSR },
    { "min-port", 1, 0, LOPT_MINPORT },
    { "dhcp-fqdn", 0, 0, LOPT_DHCP_FQDN },
    { "cname", 1, 0, LOPT_CNAME },
    { "pxe-prompt", 1, 0, LOPT_PXE_PROMT },
    { "pxe-service", 1, 0, LOPT_PXE_SERV },
    { "test", 0, 0, LOPT_TEST },
    { "tag-if", 1, 0, LOPT_TAG_IF },
    { "dhcp-proxy", 2, 0, LOPT_PROXY },
    { "dhcp-generate-names", 2, 0, LOPT_GEN_NAMES },
    { "rebind-localhost-ok", 0, 0,  LOPT_LOC_REBND },
    { "add-mac", 0, 0, LOPT_ADD_MAC },
    { "proxy-dnssec", 0, 0, LOPT_DNSSEC },
    { "dhcp-sequential-ip", 0, 0,  LOPT_INCR_ADDR },
    { "conntrack", 0, 0, LOPT_CONNTRACK },
    { "dhcp-client-update", 0, 0, LOPT_FQDN },
    { "dhcp-luascript", 1, 0, LOPT_LUASCRIPT },
    { NULL, 0, 0, 0 }
  };


#define ARG_DUP       OPT_LAST
#define ARG_ONE       OPT_LAST + 1
#define ARG_USED_CL   OPT_LAST + 2
#define ARG_USED_FILE OPT_LAST + 3

static struct {
  int opt;
  unsigned int rept;
  char * const flagdesc;
  char * const desc;
  char * const arg;
} usage[] = {
  { 'a', ARG_DUP, "<ipaddr>",  gettext_noop("Specify local address(es) to listen on."), NULL },
  { 'A', ARG_DUP, "/<domain>/<ipaddr>", gettext_noop("Return ipaddr for all hosts in specified domains."), NULL },
  { 'b', OPT_BOGUSPRIV, NULL, gettext_noop("Fake reverse lookups for RFC1918 private address ranges."), NULL },
  { 'B', ARG_DUP, "<ipaddr>", gettext_noop("Treat ipaddr as NXDOMAIN (defeats Verisign wildcard)."), NULL }, 
  { 'c', ARG_ONE, "<integer>", gettext_noop("Specify the size of the cache in entries (defaults to %s)."), "$" },
  { 'C', ARG_DUP, "<path>", gettext_noop("Specify configuration file (defaults to %s)."), CONFFILE },
  { 'd', OPT_DEBUG, NULL, gettext_noop("Do NOT fork into the background: run in debug mode."), NULL },
  { 'D', OPT_NODOTS_LOCAL, NULL, gettext_noop("Do NOT forward queries with no domain part."), NULL }, 
  { 'e', OPT_SELFMX, NULL, gettext_noop("Return self-pointing MX records for local hosts."), NULL },
  { 'E', OPT_EXPAND, NULL, gettext_noop("Expand simple names in /etc/hosts with domain-suffix."), NULL },
  { 'f', OPT_FILTER, NULL, gettext_noop("Don't forward spurious DNS requests from Windows hosts."), NULL },
  { 'F', ARG_DUP, "<ipaddr>,...", gettext_noop("Enable DHCP in the range given with lease duration."), NULL },
  { 'g', ARG_ONE, "<groupname>", gettext_noop("Change to this group after startup (defaults to %s)."), CHGRP },
  { 'G', ARG_DUP, "<hostspec>", gettext_noop("Set address or hostname for a specified machine."), NULL },
  { LOPT_DHCP_HOST, ARG_DUP, "<path>", gettext_noop("Read DHCP host specs from file."), NULL },
  { LOPT_DHCP_OPTS, ARG_DUP, "<path>", gettext_noop("Read DHCP option specs from file."), NULL },
  { LOPT_TAG_IF, ARG_DUP, "tag-expression", gettext_noop("Evaluate conditional tag expression."), NULL },
  { 'h', OPT_NO_HOSTS, NULL, gettext_noop("Do NOT load %s file."), HOSTSFILE },
  { 'H', ARG_DUP, "<path>", gettext_noop("Specify a hosts file to be read in addition to %s."), HOSTSFILE },
  { 'i', ARG_DUP, "<interface>", gettext_noop("Specify interface(s) to listen on."), NULL },
  { 'I', ARG_DUP, "<interface>", gettext_noop("Specify interface(s) NOT to listen on.") , NULL },
  { 'j', ARG_DUP, "set:<tag>,<class>", gettext_noop("Map DHCP user class to tag."), NULL },
  { LOPT_CIRCUIT, ARG_DUP, "set:<tag>,<circuit>", gettext_noop("Map RFC3046 circuit-id to tag."), NULL },
  { LOPT_REMOTE, ARG_DUP, "set:<tag>,<remote>", gettext_noop("Map RFC3046 remote-id to tag."), NULL },
  { LOPT_SUBSCR, ARG_DUP, "set:<tag>,<remote>", gettext_noop("Map RFC3993 subscriber-id to tag."), NULL },
  { 'J', ARG_DUP, "tag:<tag>...", gettext_noop("Don't do DHCP for hosts with tag set."), NULL },
  { LOPT_BROADCAST, ARG_DUP, "[=tag:<tag>...]", gettext_noop("Force broadcast replies for hosts with tag set."), NULL }, 
  { 'k', OPT_NO_FORK, NULL, gettext_noop("Do NOT fork into the background, do NOT run in debug mode."), NULL },
  { 'K', OPT_AUTHORITATIVE, NULL, gettext_noop("Assume we are the only DHCP server on the local network."), NULL },
  { 'l', ARG_ONE, "<path>", gettext_noop("Specify where to store DHCP leases (defaults to %s)."), LEASEFILE },
  { 'L', OPT_LOCALMX, NULL, gettext_noop("Return MX records for local hosts."), NULL },
  { 'm', ARG_DUP, "<host_name>,<target>,<pref>", gettext_noop("Specify an MX record."), NULL },
  { 'M', ARG_DUP, "<bootp opts>", gettext_noop("Specify BOOTP options to DHCP server."), NULL },
  { 'n', OPT_NO_POLL, NULL, gettext_noop("Do NOT poll %s file, reload only on SIGHUP."), RESOLVFILE }, 
  { 'N', OPT_NO_NEG, NULL, gettext_noop("Do NOT cache failed search results."), NULL },
  { 'o', OPT_ORDER, NULL, gettext_noop("Use nameservers strictly in the order given in %s."), RESOLVFILE },
  { 'O', ARG_DUP, "<optspec>", gettext_noop("Specify options to be sent to DHCP clients."), NULL },
  { LOPT_FORCE, ARG_DUP, "<optspec>", gettext_noop("DHCP option sent even if the client does not request it."), NULL},
  { 'p', ARG_ONE, "<integer>", gettext_noop("Specify port to listen for DNS requests on (defaults to 53)."), NULL },
  { 'P', ARG_ONE, "<integer>", gettext_noop("Maximum supported UDP packet size for EDNS.0 (defaults to %s)."), "*" },
  { 'q', OPT_LOG, NULL, gettext_noop("Log DNS queries."), NULL },
  { 'Q', ARG_ONE, "<integer>", gettext_noop("Force the originating port for upstream DNS queries."), NULL },
  { 'R', OPT_NO_RESOLV, NULL, gettext_noop("Do NOT read resolv.conf."), NULL },
  { 'r', ARG_DUP, "<path>", gettext_noop("Specify path to resolv.conf (defaults to %s)."), RESOLVFILE }, 
  { 'S', ARG_DUP, "/<domain>/<ipaddr>", gettext_noop("Specify address(es) of upstream servers with optional domains."), NULL },
  { LOPT_LOCAL, ARG_DUP, "/<domain>/", gettext_noop("Never forward queries to specified domains."), NULL },
  { 's', ARG_DUP, "<domain>[,<range>]", gettext_noop("Specify the domain to be assigned in DHCP leases."), NULL },
  { 't', ARG_ONE, "<host_name>", gettext_noop("Specify default target in an MX record."), NULL },
  { 'T', ARG_ONE, "<integer>", gettext_noop("Specify time-to-live in seconds for replies from /etc/hosts."), NULL },
  { LOPT_NEGTTL, ARG_ONE, "<integer>", gettext_noop("Specify time-to-live in seconds for negative caching."), NULL },
  { LOPT_MAXTTL, ARG_ONE, "<integer>", gettext_noop("Specify time-to-live in seconds for maximum TTL to send to clients."), NULL },
  { 'u', ARG_ONE, "<username>", gettext_noop("Change to this user after startup. (defaults to %s)."), CHUSER }, 
  { 'U', ARG_DUP, "set:<tag>,<class>", gettext_noop("Map DHCP vendor class to tag."), NULL },
  { 'v', 0, NULL, gettext_noop("Display dnsmasq version and copyright information."), NULL },
  { 'V', ARG_DUP, "<ipaddr>,<ipaddr>,<netmask>", gettext_noop("Translate IPv4 addresses from upstream servers."), NULL },
  { 'W', ARG_DUP, "<name>,<target>,...", gettext_noop("Specify a SRV record."), NULL },
  { 'w', 0, NULL, gettext_noop("Display this message. Use --help dhcp for known DHCP options."), NULL },
  { 'x', ARG_ONE, "<path>", gettext_noop("Specify path of PID file (defaults to %s)."), RUNFILE },
  { 'X', ARG_ONE, "<integer>", gettext_noop("Specify maximum number of DHCP leases (defaults to %s)."), "&" },
  { 'y', OPT_LOCALISE, NULL, gettext_noop("Answer DNS queries based on the interface a query was sent to."), NULL },
  { 'Y', ARG_DUP, "<name>,<txt>[,<txt]", gettext_noop("Specify TXT DNS record."), NULL },
  { LOPT_PTR, ARG_DUP, "<name>,<target>", gettext_noop("Specify PTR DNS record."), NULL },
  { LOPT_INTNAME, ARG_DUP, "<name>,<interface>", gettext_noop("Give DNS name to IPv4 address of interface."), NULL },
  { 'z', OPT_NOWILD, NULL, gettext_noop("Bind only to interfaces in use."), NULL },
  { 'Z', OPT_ETHERS, NULL, gettext_noop("Read DHCP static host information from %s."), ETHERSFILE },
  { '1', OPT_DBUS, NULL, gettext_noop("Enable the DBus interface for setting upstream servers, etc."), NULL },
  { '2', ARG_DUP, "<interface>", gettext_noop("Do not provide DHCP on this interface, only provide DNS."), NULL },
  { '3', ARG_DUP, "[=tag:<tag>]...", gettext_noop("Enable dynamic address allocation for bootp."), NULL },
  { '4', ARG_DUP, "set:<tag>,<mac address>", gettext_noop("Map MAC address (with wildcards) to option set."), NULL },
  { LOPT_BRIDGE, ARG_DUP, "<iface>,<alias>..", gettext_noop("Treat DHCP requests on aliases as arriving from interface."), NULL },
  { '5', OPT_NO_PING, NULL, gettext_noop("Disable ICMP echo address checking in the DHCP server."), NULL },
  { '6', ARG_ONE, "<path>", gettext_noop("Shell script to run on DHCP lease creation and destruction."), NULL },
  { LOPT_LUASCRIPT, ARG_DUP, "path", gettext_noop("Lua script to run on DHCP lease creation and destruction."), NULL },
  { LOPT_SCRIPTUSR, ARG_ONE, "<username>", gettext_noop("Run lease-change scripts as this user."), NULL },
  { '7', ARG_DUP, "<path>", gettext_noop("Read configuration from all the files in this directory."), NULL },
  { '8', ARG_ONE, "<facilty>|<file>", gettext_noop("Log to this syslog facility or file. (defaults to DAEMON)"), NULL },
  { '9', OPT_LEASE_RO, NULL, gettext_noop("Do not use leasefile."), NULL },
  { '0', ARG_ONE, "<integer>", gettext_noop("Maximum number of concurrent DNS queries. (defaults to %s)"), "!" }, 
  { LOPT_RELOAD, OPT_RELOAD, NULL, gettext_noop("Clear DNS cache when reloading %s."), RESOLVFILE },
  { LOPT_NO_NAMES, ARG_DUP, "[=tag:<tag>]...", gettext_noop("Ignore hostnames provided by DHCP clients."), NULL },
  { LOPT_OVERRIDE, OPT_NO_OVERRIDE, NULL, gettext_noop("Do NOT reuse filename and server fields for extra DHCP options."), NULL },
  { LOPT_TFTP, ARG_DUP, "[=<interface>]", gettext_noop("Enable integrated read-only TFTP server."), NULL },
  { LOPT_PREFIX, ARG_ONE, "<dir>[,<iface>]", gettext_noop("Export files by TFTP only from the specified subtree."), NULL },
  { LOPT_APREF, OPT_TFTP_APREF, NULL, gettext_noop("Add client IP address to tftp-root."), NULL },
  { LOPT_SECURE, OPT_TFTP_SECURE, NULL, gettext_noop("Allow access only to files owned by the user running dnsmasq."), NULL },
  { LOPT_TFTP_MAX, ARG_ONE, "<integer>", gettext_noop("Maximum number of conncurrent TFTP transfers (defaults to %s)."), "#" },
  { LOPT_NOBLOCK, OPT_TFTP_NOBLOCK, NULL, gettext_noop("Disable the TFTP blocksize extension."), NULL },
  { LOPT_TFTPPORTS, ARG_ONE, "<start>,<end>", gettext_noop("Ephemeral port range for use by TFTP transfers."), NULL },
  { LOPT_LOG_OPTS, OPT_LOG_OPTS, NULL, gettext_noop("Extra logging for DHCP."), NULL },
  { LOPT_MAX_LOGS, ARG_ONE, "[=<integer>]", gettext_noop("Enable async. logging; optionally set queue length."), NULL },
  { LOPT_REBIND, OPT_NO_REBIND, NULL, gettext_noop("Stop DNS rebinding. Filter private IP ranges when resolving."), NULL },
  { LOPT_LOC_REBND, OPT_LOCAL_REBIND, NULL, gettext_noop("Allow rebinding of 127.0.0.0/8, for RBL servers."), NULL },
  { LOPT_NO_REBIND, ARG_DUP, "/<domain>/", gettext_noop("Inhibit DNS-rebind protection on this domain."), NULL },
  { LOPT_NOLAST, OPT_ALL_SERVERS, NULL, gettext_noop("Always perform DNS queries to all servers."), NULL },
  { LOPT_MATCH, ARG_DUP, "set:<tag>,<optspec>", gettext_noop("Set tag if client includes matching option in request."), NULL },
  { LOPT_ALTPORT, ARG_ONE, "[=<ports>]", gettext_noop("Use alternative ports for DHCP."), NULL },
  { LOPT_NAPTR, ARG_DUP, "<name>,<naptr>", gettext_noop("Specify NAPTR DNS record."), NULL },
  { LOPT_MINPORT, ARG_ONE, "<port>", gettext_noop("Specify lowest port available for DNS query transmission."), NULL },
  { LOPT_DHCP_FQDN, OPT_DHCP_FQDN, NULL, gettext_noop("Use only fully qualified domain names for DHCP clients."), NULL },
  { LOPT_GEN_NAMES, ARG_DUP, "[=tag:<tag>]", gettext_noop("Generate hostnames based on MAC address for nameless clients."), NULL},
  { LOPT_PROXY, ARG_DUP, "[=<ipaddr>]...", gettext_noop("Use these DHCP relays as full proxies."), NULL },
  { LOPT_CNAME, ARG_DUP, "<alias>,<target>", gettext_noop("Specify alias name for LOCAL DNS name."), NULL },
  { LOPT_PXE_PROMT, ARG_DUP, "<prompt>,[<timeout>]", gettext_noop("Prompt to send to PXE clients."), NULL },
  { LOPT_PXE_SERV, ARG_DUP, "<service>", gettext_noop("Boot service for PXE menu."), NULL },
  { LOPT_TEST, 0, NULL, gettext_noop("Check configuration syntax."), NULL },
  { LOPT_ADD_MAC, OPT_ADD_MAC, NULL, gettext_noop("Add requestor's MAC address to forwarded DNS queries."), NULL },
  { LOPT_DNSSEC, OPT_DNSSEC, NULL, gettext_noop("Proxy DNSSEC validation results from upstream nameservers."), NULL },
  { LOPT_INCR_ADDR, OPT_CONSEC_ADDR, NULL, gettext_noop("Attempt to allocate sequential IP addresses to DHCP clients."), NULL },
  { LOPT_CONNTRACK, OPT_CONNTRACK, NULL, gettext_noop("Copy connection-track mark from queries to upstream connections."), NULL },
  { LOPT_FQDN, OPT_FQDN_UPDATE, NULL, gettext_noop("Allow DHCP clients to do their own DDNS updates."), NULL },
  { 0, 0, NULL, NULL, NULL }
}; 

#ifdef HAVE_DHCP

#define OT_ADDR_LIST    0x8000
#define OT_RFC1035_NAME 0x4000
#define OT_INTERNAL     0x2000
#define OT_NAME         0x1000
#define OT_CSTRING      0x0800

static const struct opttab_t {
  char *name;
  u16 val, size;
} opttab[] = {
  { "netmask", 1, OT_ADDR_LIST },
  { "time-offset", 2, 4 },
  { "router", 3, OT_ADDR_LIST  },
  { "dns-server", 6, OT_ADDR_LIST },
  { "log-server", 7, OT_ADDR_LIST },
  { "lpr-server", 9, OT_ADDR_LIST },
  { "hostname", 12, OT_INTERNAL | OT_NAME },
  { "boot-file-size", 13, 2 },
  { "domain-name", 15, OT_NAME },
  { "swap-server", 16, OT_ADDR_LIST },
  { "root-path", 17, OT_NAME },
  { "extension-path", 18, OT_NAME },
  { "ip-forward-enable", 19, 1 },
  { "non-local-source-routing", 20, 1 },
  { "policy-filter", 21, OT_ADDR_LIST },
  { "max-datagram-reassembly", 22, 2 },
  { "default-ttl", 23, 1 },
  { "mtu", 26, 2 },
  { "all-subnets-local", 27, 1 },
  { "broadcast", 28, OT_INTERNAL | OT_ADDR_LIST },
  { "router-discovery", 31, 1 },
  { "router-solicitation", 32, OT_ADDR_LIST },
  { "static-route", 33, OT_ADDR_LIST },
  { "trailer-encapsulation", 34, 1 },
  { "arp-timeout", 35, 4 },
  { "ethernet-encap", 36, 1 },
  { "tcp-ttl", 37, 1 },
  { "tcp-keepalive", 38, 4 },
  { "nis-domain", 40, OT_NAME },
  { "nis-server", 41, OT_ADDR_LIST },
  { "ntp-server", 42, OT_ADDR_LIST },
  { "vendor-encap", 43, OT_INTERNAL },
  { "netbios-ns", 44, OT_ADDR_LIST },
  { "netbios-dd", 45, OT_ADDR_LIST },
  { "netbios-nodetype", 46, 1 },
  { "netbios-scope", 47, 0 },
  { "x-windows-fs", 48, OT_ADDR_LIST },
  { "x-windows-dm", 49, OT_ADDR_LIST },
  { "requested-address", 50, OT_INTERNAL | OT_ADDR_LIST },
  { "lease-time", 51, OT_INTERNAL },
  { "option-overload", 52, OT_INTERNAL },
  { "message-type", 53, OT_INTERNAL, },
  { "server-identifier", 54, OT_INTERNAL | OT_ADDR_LIST },
  { "parameter-request", 55, OT_INTERNAL },
  { "message", 56, OT_INTERNAL },
  { "max-message-size", 57, OT_INTERNAL },
  { "T1", 58, OT_INTERNAL },
  { "T2", 59, OT_INTERNAL },
  { "vendor-class", 60, 0 },
  { "client-id", 61, OT_INTERNAL },
  { "nis+-domain", 64, OT_NAME },
  { "nis+-server", 65, OT_ADDR_LIST },
  { "tftp-server", 66, OT_NAME },
  { "bootfile-name", 67, OT_NAME },
  { "mobile-ip-home", 68, OT_ADDR_LIST }, 
  { "smtp-server", 69, OT_ADDR_LIST }, 
  { "pop3-server", 70, OT_ADDR_LIST }, 
  { "nntp-server", 71, OT_ADDR_LIST }, 
  { "irc-server", 74, OT_ADDR_LIST }, 
  { "user-class", 77, 0 },
  { "FQDN", 81, OT_INTERNAL },
  { "agent-id", 82, OT_INTERNAL },
  { "client-arch", 93, 2 },
  { "client-interface-id", 94, 0 },
  { "client-machine-id", 97, 0 },
  { "subnet-select", 118, OT_INTERNAL },
  { "domain-search", 119, OT_RFC1035_NAME },
  { "sip-server", 120, 0 },
  { "classless-static-route", 121, 0 },
  { "vendor-id-encap", 125, 0 },
  { "server-ip-address", 255, OT_ADDR_LIST }, /* special, internal only, sets siaddr */
  { NULL, 0, 0 }
};

#ifdef HAVE_DHCP6
static const struct opttab_t opttab6[] = {
  { "client-id", 1, OT_INTERNAL },
  { "server-id", 2, OT_INTERNAL },
  { "ia-na", 3, OT_INTERNAL },
  { "ia-ta", 4, OT_INTERNAL },
  { "iaaddr", 5, OT_INTERNAL },
  { "oro", 6, OT_INTERNAL },
  { "preference", 7, OT_INTERNAL },
  { "unicast", 12, OT_INTERNAL },
  { "status-code", 13, OT_INTERNAL },
  { "rapid-commit", 14, OT_INTERNAL },
  { "user-class", 15, OT_INTERNAL | OT_CSTRING },
  { "vendor-class", 16, OT_INTERNAL | OT_CSTRING },
  { "vendor-opts", 17, OT_INTERNAL },
  { "sip-server-domain", 21,  OT_RFC1035_NAME },
  { "sip-server", 22, OT_ADDR_LIST },
  { "dns-server", 23, OT_ADDR_LIST },
  { "domain-search", 24, OT_RFC1035_NAME },
  { "nis-server", 27, OT_ADDR_LIST },
  { "nis+-server", 28, OT_ADDR_LIST },
  { "nis-domain", 29,  OT_RFC1035_NAME },
  { "nis+-domain", 30, OT_RFC1035_NAME },
  { "sntp-server", 31,  OT_ADDR_LIST },
  { "FQDN", 39, OT_INTERNAL | OT_RFC1035_NAME },
  { "ntp-server", 56,  OT_ADDR_LIST },
  { "bootfile-url", 59, OT_NAME },
  { "bootfile-param", 60, OT_CSTRING },
  { NULL, 0, 0 }
};
#endif


char *option_string(int prot, unsigned int opt, unsigned char *val, int opt_len, char *buf, int buf_len)
{
  int o, i, j, nodecode = 0;
  const struct opttab_t *ot = opttab;

#ifdef HAVE_DHCP6
  if (prot == AF_INET6)
    ot = opttab6;
#endif

  for (o = 0; ot[o].name; o++)
    if (ot[o].val == opt)
      {
	if (buf)
	  {
	    memset(buf, 0, buf_len);
	    
	    if (ot[o].size & OT_ADDR_LIST) 
	      {
		struct all_addr addr;
		int addr_len = INADDRSZ;

#ifdef HAVE_DHCP6
		if (prot == AF_INET6)
		  addr_len = IN6ADDRSZ;
#endif
		for (buf[0]= 0, i = 0; i <= opt_len - addr_len; i += addr_len) 
		  {
		    if (i != 0)
		      strncat(buf, ", ", buf_len - strlen(buf));
		    /* align */
		    memcpy(&addr, &val[i], addr_len); 
		    inet_ntop(prot, &val[i], daemon->addrbuff, ADDRSTRLEN);
		    strncat(buf, daemon->addrbuff, buf_len - strlen(buf));
		  }
	      }
	    else if (ot[o].size & OT_NAME)
		for (i = 0, j = 0; i < opt_len && j < buf_len ; i++)
		  {
		    char c = val[i];
		    if (isprint((int)c))
		      buf[j++] = c;
		  }
#ifdef HAVE_DHCP6
	    /* We don't handle compressed rfc1035 names, so no good in IPv4 land */
	    else if ((ot[o].size & OT_RFC1035_NAME) && prot == AF_INET6)
	      {
		i = 0, j = 0;
		while (i < opt_len && val[i] != 0)
		  {
		    int k, l = i + val[i] + 1;
		    for (k = i + 1; k < opt_len && k < l && j < buf_len ; k++)
		     {
		       char c = val[k];
		       if (isprint((int)c))
			 buf[j++] = c;
		     }
		    i = l;
		    if (val[i] != 0 && j < buf_len)
		      buf[j++] = '.';
		  }
	      }
	    else if ((ot[o].size & OT_CSTRING))
	      {
		int k, len;
		unsigned char *p;

		i = 0, j = 0;
		while (1)
		  {
		    p = &val[i];
		    GETSHORT(len, p);
		    for (k = 0; k < len && j < buf_len; k++)
		      {
		       char c = *p++;
		       if (isprint((int)c))
			 buf[j++] = c;
		     }
		    i += len +2;
		    if (i >= opt_len)
		      break;

		    if (j < buf_len)
		      buf[j++] = ',';
		  }
	      }	      
#endif
	    else 
	      nodecode = 1;
	  }
	break;
      }

  if (buf && (!ot[o].name || nodecode))
    {
      int trunc  = 0;
      if (opt_len > 13)
	{
	  trunc = 1;
	  opt_len = 13;
	}
      print_mac(buf, val, opt_len);
      if (trunc)
	strncat(buf, "...", buf_len - strlen(buf));
    

    }

  return ot[o].name ? ot[o].name : "";

}

#endif

/* We hide metacharaters in quoted strings by mapping them into the ASCII control
   character space. Note that the \0, \t \b \r \033 and \n characters are carefully placed in the
   following sequence so that they map to themselves: it is therefore possible to call
   unhide_metas repeatedly on string without breaking things.
   The transformation gets undone by opt_canonicalise, atoi_check and opt_string_alloc, and a 
   couple of other places. 
   Note that space is included here so that
   --dhcp-option=3, string
   has five characters, whilst
   --dhcp-option=3," string"
   has six.
*/

static const char meta[] = "\000123456 \b\t\n78\r90abcdefABCDE\033F:,.";

static char hide_meta(char c)
{
  unsigned int i;

  for (i = 0; i < (sizeof(meta) - 1); i++)
    if (c == meta[i])
      return (char)i;
  
  return c;
}

static char unhide_meta(char cr)
{ 
  unsigned int c = cr;
  
  if (c < (sizeof(meta) - 1))
    cr = meta[c];
  
  return cr;
}

static void unhide_metas(char *cp)
{
  if (cp)
    for(; *cp; cp++)
      *cp = unhide_meta(*cp);
}

static void *opt_malloc(size_t size)
{
  void *ret;

  if (mem_recover)
    {
      ret = whine_malloc(size);
      if (!ret)
	longjmp(mem_jmp, 1);
    }
  else
    ret = safe_malloc(size);
  
  return ret;
}

static char *opt_string_alloc(char *cp)
{
  char *ret = NULL;
  
  if (cp && strlen(cp) != 0)
    {
      ret = opt_malloc(strlen(cp)+1);
      strcpy(ret, cp); 
      
      /* restore hidden metachars */
      unhide_metas(ret);
    }
    
  return ret;
}


/* find next comma, split string with zero and eliminate spaces.
   return start of string following comma */

static char *split_chr(char *s, char c)
{
  char *comma, *p;

  if (!s || !(comma = strchr(s, c)))
    return NULL;
  
  p = comma;
  *comma = ' ';
  
  for (; *comma == ' '; comma++);
 
  for (; (p >= s) && *p == ' '; p--)
    *p = 0;
    
  return comma;
}

static char *split(char *s)
{
  return split_chr(s, ',');
}

static char *canonicalise_opt(char *s)
{
  char *ret;
  int nomem;

  if (!s)
    return 0;

  unhide_metas(s);
  if (!(ret = canonicalise(s, &nomem)) && nomem)
    {
      if (mem_recover)
	longjmp(mem_jmp, 1);
      else
	die(_("could not get memory"), NULL, EC_NOMEM);
    }

  return ret;
}

static int atoi_check(char *a, int *res)
{
  char *p;

  if (!a)
    return 0;

  unhide_metas(a);
  
  for (p = a; *p; p++)
     if (*p < '0' || *p > '9')
       return 0;

  *res = atoi(a);
  return 1;
}

static int atoi_check16(char *a, int *res)
{
  if (!(atoi_check(a, res)) ||
      *res < 0 ||
      *res > 0xffff)
    return 0;

  return 1;
}
	
static void add_txt(char *name, char *txt)
{
  size_t len = strlen(txt);
  struct txt_record *r = opt_malloc(sizeof(struct txt_record));
  
  r->name = opt_string_alloc(name);
  r->next = daemon->txt;
  daemon->txt = r;
  r->class = C_CHAOS;
  r->txt = opt_malloc(len+1);
  r->len = len+1;
  *(r->txt) = len;
  memcpy((r->txt)+1, txt, len);
}

static void do_usage(void)
{
  char buff[100];
  int i, j;

  struct {
    char handle;
    int val;
  } tab[] = {
    { '$', CACHESIZ },
    { '*', EDNS_PKTSZ },
    { '&', MAXLEASES },
    { '!', FTABSIZ },
    { '#', TFTP_MAX_CONNECTIONS },
    { '\0', 0 }
  };

  printf(_("Usage: dnsmasq [options]\n\n"));
#ifndef HAVE_GETOPT_LONG
  printf(_("Use short options only on the command line.\n"));
#endif
  printf(_("Valid options are:\n"));
  
  for (i = 0; usage[i].opt != 0; i++)
    {
      char *desc = usage[i].flagdesc; 
      char *eq = "=";
      
      if (!desc || *desc == '[')
	eq = "";
      
      if (!desc)
	desc = "";

      for ( j = 0; opts[j].name; j++)
	if (opts[j].val == usage[i].opt)
	  break;
      if (usage[i].opt < 256)
	sprintf(buff, "-%c, ", usage[i].opt);
      else
	sprintf(buff, "    ");
      
      sprintf(buff+4, "--%s%s%s", opts[j].name, eq, desc);
      printf("%-40.40s", buff);
	     
      if (usage[i].arg)
	{
	  strcpy(buff, usage[i].arg);
	  for (j = 0; tab[j].handle; j++)
	    if (tab[j].handle == *(usage[i].arg))
	      sprintf(buff, "%d", tab[j].val);
	}
      printf(_(usage[i].desc), buff);
      printf("\n");
    }
}

#ifdef HAVE_DHCP
static void display_opts(void)
{
  int i;
  
  printf(_("Known DHCP options:\n"));
  
  for (i = 0; opttab[i].name; i++)
    if (!(opttab[i].size & OT_INTERNAL))
      printf("%3d %s\n", opttab[i].val, opttab[i].name);
}

#ifdef HAVE_DHCP6
static void display_opts6(void)
{
  int i;
  printf(_("Known DHCPv6 options:\n"));
  
  for (i = 0; opttab6[i].name; i++)
    if (!(opttab6[i].size & OT_INTERNAL))
      printf("%3d %s\n", opttab6[i].val, opttab6[i].name);
}
#endif


static int is_tag_prefix(char *arg)
{
  if (arg && (strstr(arg, "net:") == arg || strstr(arg, "tag:") == arg))
    return 1;
  
  return 0;
}

static char *set_prefix(char *arg)
{
   if (strstr(arg, "set:") == arg)
     return arg+4;
   
   return arg;
}

/* This is too insanely large to keep in-line in the switch */
static char *parse_dhcp_opt(char *arg, int flags)
{
  struct dhcp_opt *new = opt_malloc(sizeof(struct dhcp_opt));
  char lenchar = 0, *cp;
  int i, addrs, digs, is_addr, is_addr6, is_hex, is_dec, is_string, dots;
  char *comma = NULL, *problem = NULL;
  struct dhcp_netid *np = NULL;
  u16 opt_len = 0;
  int is6 = 0;

  new->len = 0;
  new->flags = flags;
  new->netid = NULL;
  new->val = NULL;
  new->opt = 0;
  
  while (arg)
    {
      comma = split(arg);      

      for (cp = arg; *cp; cp++)
	if (*cp < '0' || *cp > '9')
	  break;
      
      if (!*cp)
	{
	  new->opt = atoi(arg);
	  opt_len = 0;
	  break;
	}
      
      if (strstr(arg, "option:") == arg)
	{
	  for (i = 0; opttab[i].name; i++)
	    if (!(opttab[i].size & OT_INTERNAL) &&
		strcasecmp(opttab[i].name, arg+7) == 0)
	      {
		new->opt = opttab[i].val;
		opt_len = opttab[i].size;
		break;
	      }
	  /* option:<optname> must follow tag and vendor string. */
	  break;
	}
#ifdef HAVE_DHCP6
      else if (strstr(arg, "option6:") == arg)
	{
	  for (cp = arg+8; *cp; cp++)
	    if (*cp < '0' || *cp > '9')
	      break;
	 
	  if (!*cp)
	    {
	      new->opt = atoi(arg+8);
	      opt_len = 0;
	    }
	  else
	    for (i = 0; opttab6[i].name; i++)
	      if (!(opttab6[i].size & OT_INTERNAL) &&
		  strcasecmp(opttab6[i].name, arg+8) == 0)
		{
		  new->opt = opttab6[i].val;
		  opt_len = opttab6[i].size;
		  break;
		}
	  /* option6:<opt>|<optname> must follow tag and vendor string. */
	  is6 = 1;
	  break;
	}
#endif
      else if (strstr(arg, "vendor:") == arg)
	{
	  new->u.vendor_class = (unsigned char *)opt_string_alloc(arg+7);
	  new->flags |= DHOPT_VENDOR;
	}
      else if (strstr(arg, "encap:") == arg)
	{
	  new->u.encap = atoi(arg+6);
	  new->flags |= DHOPT_ENCAPSULATE;
	}
      else if (strstr(arg, "vi-encap:") == arg)
	{
	  new->u.encap = atoi(arg+9);
	  new->flags |= DHOPT_RFC3925;
	  if (flags == DHOPT_MATCH)
	    {
	      new->opt = 1; /* avoid error below */
	      break;
	    }
	}
      else
	{
	  new->netid = opt_malloc(sizeof (struct dhcp_netid));
	  /* allow optional "net:" or "tag:" for consistency */
	  if (is_tag_prefix(arg))
	    new->netid->net = opt_string_alloc(arg+4);
	  else
	    new->netid->net = opt_string_alloc(set_prefix(arg));
	  new->netid->next = np;
	  np = new->netid;
	}
      
      arg = comma; 
    }

#ifdef HAVE_DHCP6
  if (is6)
    {
      if (new->flags & (DHOPT_VENDOR | DHOPT_ENCAPSULATE))
	problem = _("unsupported encapsulation for IPv6 option");
      
      if (opt_len == 0 &&
	  !(new->flags & DHOPT_RFC3925))
	for (i = 0; opttab6[i].name; i++)
	  if (new->opt == opttab6[i].val)
	    {
	      opt_len = opttab6[i].size;
	      if (opt_len & OT_INTERNAL)
		opt_len = 0;
	      break;
	    }
    }
  else
#endif
    if (opt_len == 0 &&
	!(new->flags & (DHOPT_VENDOR | DHOPT_ENCAPSULATE | DHOPT_RFC3925)))
      for (i = 0; opttab[i].name; i++)
	if (new->opt == opttab[i].val)
	  {
	    opt_len = opttab[i].size;
	    if (opt_len & OT_INTERNAL)
	      opt_len = 0;
	    break;
	  }

  /* option may be missing with rfc3925 match */
  if (new->opt == 0)
    problem = _("bad dhcp-option");
  else if (comma)
    {
      /* characterise the value */
      char c;
      int found_dig = 0;
      is_addr = is_addr6 = is_hex = is_dec = is_string = 1;
      addrs = digs = 1;
      dots = 0;
      for (cp = comma; (c = *cp); cp++)
	if (c == ',')
	  {
	    addrs++;
	    is_dec = is_hex = 0;
	  }
	else if (c == ':')
	  {
	    digs++;
	    is_dec = is_addr = 0;
	  }
	else if (c == '/') 
	  {
	    is_addr6 = is_dec = is_hex = 0;
	    if (cp == comma) /* leading / means a pathname */
	      is_addr = 0;
	  } 
	else if (c == '.')	
	  {
	    is_addr6 =is_dec = is_hex = 0;
	    dots++;
	  }
	else if (c == '-')
	  is_hex = is_addr = is_addr6 = 0;
	else if (c == ' ')
	  is_dec = is_hex = 0;
	else if (!(c >='0' && c <= '9'))
	  {
	    is_addr = 0;
	    if (cp[1] == 0 && is_dec &&
		(c == 'b' || c == 's' || c == 'i'))
	      {
		lenchar = c;
		*cp = 0;
	      }
	    else
	      is_dec = 0;
	    if (!((c >='A' && c <= 'F') ||
		  (c >='a' && c <= 'f') || 
		  (c == '*' && (flags & DHOPT_MATCH))))
	      {
		is_hex = 0;
		if (c != '[' && c != ']')
		  is_addr6 = 0;
	      }
	  }
	else
	  found_dig = 1;
     
      if (!found_dig)
	is_dec = is_addr = 0;
     
      /* We know that some options take addresses */
      if (opt_len & OT_ADDR_LIST)
	{
	  is_string = is_dec = is_hex = 0;
	  
	  if (!is6 && (!is_addr || dots == 0))
	    problem = _("bad IP address");

	   if (is6 && !is_addr6)
	     problem = _("bad IPv6 address");
	}
      /* or names */
      else if (opt_len & (OT_NAME | OT_RFC1035_NAME | OT_CSTRING))
	is_addr6 = is_addr = is_dec = is_hex = 0;
            
      if (is_hex && digs > 1)
	{
	  new->len = digs;
	  new->val = opt_malloc(new->len);
	  parse_hex(comma, new->val, digs, (flags & DHOPT_MATCH) ? &new->u.wildcard_mask : NULL, NULL);
	  new->flags |= DHOPT_HEX;
	}
      else if (is_dec)
	{
	  int i, val = atoi(comma);
	  /* assume numeric arg is 1 byte except for
	     options where it is known otherwise.
	     For vendor class option, we have to hack. */
	  if (opt_len != 0)
	    new->len = opt_len;
	  else if (val & 0xffff0000)
	    new->len = 4;
	  else if (val & 0xff00)
	    new->len = 2;
	  else
	    new->len = 1;

	  if (lenchar == 'b')
	    new->len = 1;
	  else if (lenchar == 's')
	    new->len = 2;
	  else if (lenchar == 'i')
	    new->len = 4;
	  
	  new->val = opt_malloc(new->len);
	  for (i=0; i<new->len; i++)
	    new->val[i] = val>>((new->len - i - 1)*8);
	}
      else if (is_addr && !is6)	
	{
	  struct in_addr in;
	  unsigned char *op;
	  char *slash;
	  /* max length of address/subnet descriptor is five bytes,
	     add one for the option 120 enc byte too */
	  new->val = op = opt_malloc((5 * addrs) + 1);
	  new->flags |= DHOPT_ADDR;

	  if (!(new->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR | DHOPT_RFC3925)) && 
	      new->opt == OPTION_SIP_SERVER)
	    {
	      *(op++) = 1; /* RFC 3361 "enc byte" */
	      new->flags &= ~DHOPT_ADDR;
	    }
	  while (addrs--) 
	    {
	      cp = comma;
	      comma = split(cp);
	      slash = split_chr(cp, '/');
	      in.s_addr = inet_addr(cp);
	      if (!slash)
		{
		  memcpy(op, &in, INADDRSZ);
		  op += INADDRSZ;
		}
	      else
		{
		  unsigned char *p = (unsigned char *)&in;
		  int netsize = atoi(slash);
		  *op++ = netsize;
		  if (netsize > 0)
		    *op++ = *p++;
		  if (netsize > 8)
		    *op++ = *p++;
		  if (netsize > 16)
		    *op++ = *p++;
		  if (netsize > 24)
		    *op++ = *p++;
		  new->flags &= ~DHOPT_ADDR; /* cannot re-write descriptor format */
		} 
	    }
	  new->len = op - new->val;
	}
      else if (is_addr6 && is6)
	{
	  unsigned char *op;
	  new->val = op = opt_malloc(16 * addrs);
	  new->flags |= DHOPT_ADDR6;
	  while (addrs--) 
	    {
	      cp = comma;
	      comma = split(cp);
	      
	      /* check for [1234::7] */
	      if (*cp == '[')
		cp++;
	      if (strlen(cp) > 1 && cp[strlen(cp)-1] == ']')
		cp[strlen(cp)-1] = 0;
	      
	      if (inet_pton(AF_INET6, cp, op))
		{
		  op += IN6ADDRSZ;
		  continue;
		}
	  
	      problem = _("bad IPv6 address");
	    } 
	  new->len = op - new->val;
	}
      else if (is_string)
	{
 	  /* text arg */
	  if ((new->opt == OPTION_DOMAIN_SEARCH || new->opt == OPTION_SIP_SERVER) &&
	      !is6 && !(new->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR | DHOPT_RFC3925)))
	    {
	      /* dns search, RFC 3397, or SIP, RFC 3361 */
	      unsigned char *q, *r, *tail;
	      unsigned char *p, *m = NULL, *newp;
	      size_t newlen, len = 0;
	      int header_size = (new->opt == OPTION_DOMAIN_SEARCH) ? 0 : 1;
	      
	      arg = comma;
	      comma = split(arg);
	      
	      while (arg && *arg)
		{
		  char *in, *dom = NULL;
		  size_t domlen = 1;
		  /* Allow "." as an empty domain */
		  if (strcmp (arg, ".") != 0)
		    {
		      if (!(dom = canonicalise_opt(arg)))
			{
			  problem = _("bad domain in dhcp-option");
			  break;
			}
		      domlen = strlen(dom) + 2;
		    }
		      
		  newp = opt_malloc(len + domlen + header_size);
		  if (m)
		    {
		      memcpy(newp, m, header_size + len);
		      free(m);
		    }
		  m = newp;
		  p = m + header_size;
		  q = p + len;
		  
		  /* add string on the end in RFC1035 format */
		  for (in = dom; in && *in;) 
		    {
		      unsigned char *cp = q++;
		      int j;
		      for (j = 0; *in && (*in != '.'); in++, j++)
			*q++ = *in;
		      *cp = j;
		      if (*in)
			in++;
		    }
		  *q++ = 0;
		  free(dom);
		  
		  /* Now tail-compress using earlier names. */
		  newlen = q - p;
		  for (tail = p + len; *tail; tail += (*tail) + 1)
		    for (r = p; r - p < (int)len; r += (*r) + 1)
		      if (strcmp((char *)r, (char *)tail) == 0)
			{
			  PUTSHORT((r - p) | 0xc000, tail); 
			  newlen = tail - p;
			  goto end;
			}
		end:
		  len = newlen;
		  
		  arg = comma;
		  comma = split(arg);
		}
      
	      /* RFC 3361, enc byte is zero for names */
	      if (new->opt == OPTION_SIP_SERVER)
		m[0] = 0;
	      new->len = (int) len + header_size;
	      new->val = m;
	    }
#ifdef HAVE_DHCP6
	  else if (comma && (opt_len & OT_CSTRING))
	    {
	      /* length fields are two bytes so need 16 bits for each string */
	      int commas = 1;
	      unsigned char *p, *newp;

	      for(i = 0; comma[i]; i++)
		if (comma[i] == ',')
		  commas++;
	      
	      newp = opt_malloc(strlen(comma)+(2*commas));	  
	      p = newp;
	      arg = comma;
	      comma = split(arg);
	      
	      while (arg && *arg)
		{
		  u16 len = strlen(arg);
		  PUTSHORT(len, p);
		  memcpy(p, arg, len);
		  p += len; 

		  arg = comma;
		  comma = split(arg);
		}

	      new->val = newp;
	      new->len = p - newp;
	    }
	  else if (comma && (opt_len & OT_RFC1035_NAME))
	    {
	      int commas = 1;
	      unsigned char *p, *newp;
	      
	      for(i = 0; comma[i]; i++)
		if (comma[i] == ',')
		  commas++;
	      
	      newp = opt_malloc(strlen(comma)+(2*commas));
	      p = newp;
	      arg = comma;
	      comma = split(arg);
	      
	      while (arg && *arg)
		{
		  p = do_rfc1035_name(p, arg);
		  *p++ = 0;
		  
		  arg = comma;
		  comma = split(arg);
		}
	      
	      new->val = newp;
	      new->len = p - newp;
	    }
#endif
	  else
	    {
	      new->len = strlen(comma);
	      /* keep terminating zero on string */
	      new->val = (unsigned char *)opt_string_alloc(comma);
	      new->flags |= DHOPT_STRING;
	    }
	}
    }

  if (!is6 && 
      ((new->len > 255) || 
      (new->len > 253 && (new->flags & (DHOPT_VENDOR | DHOPT_ENCAPSULATE))) ||
       (new->len > 250 && (new->flags & DHOPT_RFC3925))))
    problem = _("dhcp-option too long");
  
  if (!problem)
    {
      if (flags == DHOPT_MATCH)
	{
	  if ((new->flags & (DHOPT_ENCAPSULATE | DHOPT_VENDOR)) ||
	      !new->netid ||
	      new->netid->next)
	    problem = _("illegal dhcp-match");
	  else if (is6)
	    {
	      new->next = daemon->dhcp_match6;
	      daemon->dhcp_match6 = new;
	    }
	  else
	    {
	      new->next = daemon->dhcp_match;
	      daemon->dhcp_match = new;
	    }
	}
      else if (is6)
	{
	  new->next = daemon->dhcp_opts6;
	  daemon->dhcp_opts6 = new;
	}
      else
	{
	  new->next = daemon->dhcp_opts;
	  daemon->dhcp_opts = new;
	}
    }

  return problem;
}

#endif

void set_option_bool(unsigned int opt)
{
  if (opt < 32)
    daemon->options |= 1u << opt;
  else
    daemon->options2 |= 1u << (opt - 32);
}

static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
{      
  int i;
  char *comma, *problem = NULL;;

  if (option == '?')
    return gen_prob;
  
  for (i=0; usage[i].opt != 0; i++)
    if (usage[i].opt == option)
      {
	 int rept = usage[i].rept;
	 
	 if (command_line)
	   {
	     /* command line */
	     if (rept == ARG_USED_CL)
	       return _("illegal repeated flag");
	     if (rept == ARG_ONE)
	       usage[i].rept = ARG_USED_CL;
	   }
	 else
	   {
	     /* allow file to override command line */
	     if (rept == ARG_USED_FILE)
	       return _("illegal repeated keyword");
	     if (rept == ARG_USED_CL || rept == ARG_ONE)
	       usage[i].rept = ARG_USED_FILE;
	   }

	 if (rept != ARG_DUP && rept != ARG_ONE && rept != ARG_USED_CL) 
	   {
	     set_option_bool(rept);
	     return NULL;
	   }
       
	 break;
      }
  
  switch (option)
    { 
    case 'C': /* --conf-file */
      {
	char *file = opt_string_alloc(arg);
	if (file)
	  {
	    one_file(file, 0);
	    free(file);
	  }
	break;
      }

    case '7': /* --conf-dir */	      
      {
	DIR *dir_stream;
	struct dirent *ent;
	char *directory, *path;
	struct list {
	  char *suffix;
	  struct list *next;
	} *ignore_suffix = NULL, *li;
	
	comma = split(arg);
	if (!(directory = opt_string_alloc(arg)))
	  break;
	
	for (arg = comma; arg; arg = comma) 
	  {
	    comma = split(arg);
	    li = opt_malloc(sizeof(struct list));
	    li->next = ignore_suffix;
	    ignore_suffix = li;
	    /* Have to copy: buffer is overwritten */
	    li->suffix = opt_string_alloc(arg);
	  };
	
	if (!(dir_stream = opendir(directory)))
	  die(_("cannot access directory %s: %s"), directory, EC_FILE);
	
	while ((ent = readdir(dir_stream)))
	  {
	    size_t len = strlen(ent->d_name);
	    struct stat buf;
	    
	    /* ignore emacs backups and dotfiles */
	    if (len == 0 ||
		ent->d_name[len - 1] == '~' ||
		(ent->d_name[0] == '#' && ent->d_name[len - 1] == '#') ||
		ent->d_name[0] == '.')
	      continue;

	    for (li = ignore_suffix; li; li = li->next)
	      {
		/* check for proscribed suffices */
		size_t ls = strlen(li->suffix);
		if (len > ls &&
		    strcmp(li->suffix, &ent->d_name[len - ls]) == 0)
		  break;
	      }
	    if (li)
	      continue;
	    
	    path = opt_malloc(strlen(directory) + len + 2);
	    strcpy(path, directory);
	    strcat(path, "/");
	    strcat(path, ent->d_name);

	    if (stat(path, &buf) == -1)
	      die(_("cannot access %s: %s"), path, EC_FILE);
	    /* only reg files allowed. */
	    if (!S_ISREG(buf.st_mode))
	      continue;
	    
	    /* files must be readable */
	    one_file(path, 0);
	    free(path);
	  }
     
	closedir(dir_stream);
	free(directory);
	for(; ignore_suffix; ignore_suffix = li)
	  {
	    li = ignore_suffix->next;
	    free(ignore_suffix->suffix);
	    free(ignore_suffix);
	  }
	      
	break;
      }

    case '8': /* --log-facility */
      /* may be a filename */
      if (strchr(arg, '/') || strcmp (arg, "-") == 0)
	daemon->log_file = opt_string_alloc(arg);
      else
	{	  
#ifdef __ANDROID__
	  problem = _("setting log facility is not possible under Android");
#else
	  for (i = 0; facilitynames[i].c_name; i++)
	    if (hostname_isequal((char *)facilitynames[i].c_name, arg))
	      break;
	  
	  if (facilitynames[i].c_name)
	    daemon->log_fac = facilitynames[i].c_val;
	  else
	    problem = _("bad log facility");
#endif
	}
      break;
      
    case 'x': /* --pid-file */
      daemon->runfile = opt_string_alloc(arg);
      break;

    case 'r': /* --resolv-file */
      {
	char *name = opt_string_alloc(arg);
	struct resolvc *new, *list = daemon->resolv_files;
	
	if (list && list->is_default)
	  {
	    /* replace default resolv file - possibly with nothing */
	    if (name)
	      {
		list->is_default = 0;
		list->name = name;
	      }
	    else
	      list = NULL;
	  }
	else if (name)
	  {
	    new = opt_malloc(sizeof(struct resolvc));
	    new->next = list;
	    new->name = name;
	    new->is_default = 0;
	    new->mtime = 0;
	    new->logged = 0;
	    list = new;
	  }
	daemon->resolv_files = list;
	break;
      }
      
    case 'm':  /* --mx-host */
      {
	int pref = 1;
	struct mx_srv_record *new;
	char *name, *target = NULL;

	if ((comma = split(arg)))
	  {
	    char *prefstr;
	    if ((prefstr = split(comma)) && !atoi_check16(prefstr, &pref))
	      problem = _("bad MX preference");
	  }
	
	if (!(name = canonicalise_opt(arg)) || 
	    (comma && !(target = canonicalise_opt(comma))))
	  problem = _("bad MX name");
	
	new = opt_malloc(sizeof(struct mx_srv_record));
	new->next = daemon->mxnames;
	daemon->mxnames = new;
	new->issrv = 0;
	new->name = name;
	new->target = target; /* may be NULL */
	new->weight = pref;
	break;
      }
      
    case 't': /*  --mx-target */
      if (!(daemon->mxtarget = canonicalise_opt(arg)))
	problem = _("bad MX target");
      break;

#ifdef HAVE_DHCP      
    case 'l':  /* --dhcp-leasefile */
      daemon->lease_file = opt_string_alloc(arg);
      break;
      
      /* Sorry about the gross pre-processor abuse */
    case '6':             /* --dhcp-script */
    case LOPT_LUASCRIPT:  /* --dhcp-luascript */
#  if defined(NO_FORK)
      problem = _("cannot run scripts under uClinux");
#  elif !defined(HAVE_SCRIPT)
      problem = _("recompile with HAVE_SCRIPT defined to enable lease-change scripts");
#  else
      if (option == LOPT_LUASCRIPT)
#    if !defined(HAVE_LUASCRIPT)
	problem = _("recompile with HAVE_LUASCRIPT defined to enable Lua scripts");
#    else
        daemon->luascript = opt_string_alloc(arg);
#    endif
      else
        daemon->lease_change_command = opt_string_alloc(arg);
#  endif
      break;
#endif /* HAVE_DHCP */

    case LOPT_DHCP_HOST: /* --dhcp-hostfile */
    case LOPT_DHCP_OPTS: /* --dhcp-optsfile */
    case 'H': /* --addn-hosts */
      {
	struct hostsfile *new = opt_malloc(sizeof(struct hostsfile));
	static int hosts_index = 1;
	new->fname = opt_string_alloc(arg);
	new->index = hosts_index++;
	new->flags = 0;
	if (option == 'H')
	  {
	    new->next = daemon->addn_hosts;
	    daemon->addn_hosts = new;
	  }
	else if (option == LOPT_DHCP_HOST)
	  {
	    new->next = daemon->dhcp_hosts_file;
	    daemon->dhcp_hosts_file = new;
	  }
	else if (option ==  LOPT_DHCP_OPTS)
	  {
	    new->next = daemon->dhcp_opts_file;
	    daemon->dhcp_opts_file = new;
	  } 	  
	break;
      }
      
    case 's': /* --domain */
      if (strcmp (arg, "#") == 0)
	set_option_bool(OPT_RESOLV_DOMAIN);
      else
	{
	  char *d;
	  comma = split(arg);
	  if (!(d = canonicalise_opt(arg)))
	    option = '?';
	  else
	    {
	      if (comma)
		{
		  struct cond_domain *new = safe_malloc(sizeof(struct cond_domain));
		  char *netpart;

		  unhide_metas(comma);
		  if ((netpart = split_chr(comma, '/')))
		    {
		      int msize;

		      arg = split(netpart);
		      if (!atoi_check(netpart, &msize))
			option = '?';
		      else if (inet_pton(AF_INET, comma, &new->start))
			{
			  int mask = (1 << (32 - msize)) - 1;
			  new->is6 = 0; 			  
			  new->start.s_addr = ntohl(htonl(new->start.s_addr) & ~mask);
			  new->end.s_addr = new->start.s_addr | htonl(mask);
			  if (arg)
			    {
			      /* generate the equivalent of
				 local=/<domain>/
				 local=/xxx.yyy.zzz.in-addr.arpa/ */

			      if (strcmp(arg, "local") != 0 || 
				  (msize != 8 && msize != 16 && msize != 24))
				option = '?';
			      else
				{
				  struct server *serv = opt_malloc(sizeof(struct server));
				  in_addr_t a = ntohl(new->start.s_addr) >> 8;
				  char *p;

				  memset(serv, 0, sizeof(struct server));
				  serv->domain = d;
				  serv->flags = SERV_HAS_DOMAIN | SERV_NO_ADDR;
				  serv->next = daemon->servers;
				  daemon->servers = serv;

				  serv = opt_malloc(sizeof(struct server));
				  memset(serv, 0, sizeof(struct server));
				  p = serv->domain = opt_malloc(25); /* strlen("xxx.yyy.zzz.in-addr.arpa")+1 */
				  
				  if (msize == 24)
				    p += sprintf(p, "%d.", a & 0xff);
				  a = a >> 8;
				  if (msize != 8)
				    p += sprintf(p, "%d.", a & 0xff);
				  a = a >> 8;
				  p += sprintf(p, "%d.in-addr.arpa", a & 0xff);

				  serv->flags = SERV_HAS_DOMAIN | SERV_NO_ADDR;
				  serv->next = daemon->servers;
				  daemon->servers = serv;
				}
			    }
			}
#ifdef HAVE_IPV6
		      else if (inet_pton(AF_INET6, comma, &new->start6))
			{
			  u64 mask = (1LLU << (128 - msize)) - 1LLU;
			  u64 addrpart = addr6part(&new->start6);
			  new->is6 = 1;

			  /* prefix==64 overflows the mask calculation above */
			  if (msize == 64)
			    mask = (u64)-1LL;

			  new->end6 = new->start6;
			  setaddr6part(&new->start6, addrpart & ~mask);
			  setaddr6part(&new->end6, addrpart | mask);
			  
			  if (msize < 64)
			    option = '?';
			  else if (arg)
			    {
			      /* generate the equivalent of
				 local=/<domain>/
				 local=/xxx.yyy.zzz.ip6.arpa/ */

			      if (strcmp(arg, "local") != 0 || (msize & 4 != 0))
				option = '?';
			      else 
				{
				  struct server *serv = opt_malloc(sizeof(struct server));
				  in_addr_t a = ntohl(new->start.s_addr) >> 8;
				  char *p;

				  memset(serv, 0, sizeof(struct server));
				  serv->domain = d;
				  serv->flags = SERV_HAS_DOMAIN | SERV_NO_ADDR;
				  serv->next = daemon->servers;
				  daemon->servers = serv;

				  serv = opt_malloc(sizeof(struct server));
				  memset(serv, 0, sizeof(struct server));
				  p = serv->domain = opt_malloc(73); /* strlen("32*<n.>ip6.arpa")+1 */
				  
				  for (i = msize-1; i >= 0; i -= 4)
				    { 
				      int dig = ((unsigned char *)&new->start6)[i>>3];
				      p += sprintf(p, "%.1x.", (i>>2) & 1 ? dig & 15 : dig >> 4);
				    }
				  p += sprintf(p, "ip6.arpa");
				  
				  serv->flags = SERV_HAS_DOMAIN | SERV_NO_ADDR;
				  serv->next = daemon->servers;
				  daemon->servers = serv;
				}
			    }
			}
#endif
		      else
			option = '?';
		    }
		  else 
		    {
		      arg = split(comma);
		      if (inet_pton(AF_INET, comma, &new->start))
			{
			  new->is6 = 0;
			  if (!arg)
			    new->end.s_addr = new->start.s_addr;
			  else if (!inet_pton(AF_INET, arg, &new->end))
			    option = '?';
			}
#ifdef HAVE_IPV6
		      else if (inet_pton(AF_INET6, comma, &new->start6))
			{
			  new->is6 = 1;
			  if (!arg)
			    memcpy(&new->end6, &new->start6, IN6ADDRSZ);
			  else if (!inet_pton(AF_INET6, arg, &new->end6))
			    option = '?';
			}
#endif
		      else 
			option = '?';

		      new->domain = d;
		      new->next = daemon->cond_domain;
		      daemon->cond_domain = new;
		      
		    }
		}
	      else
		daemon->domain_suffix = d;
	    }
	}
      break;
      
    case 'u':  /* --user */
      daemon->username = opt_string_alloc(arg);
      break;
      
    case 'g':  /* --group */
      daemon->groupname = opt_string_alloc(arg);
      daemon->group_set = 1;
      break;

#ifdef HAVE_DHCP
    case LOPT_SCRIPTUSR: /* --scriptuser */
      daemon->scriptuser = opt_string_alloc(arg);
      break;
#endif
      
    case 'i':  /* --interface */
      do {
	struct iname *new = opt_malloc(sizeof(struct iname));
	comma = split(arg);
	new->next = daemon->if_names;
	daemon->if_names = new;
	/* new->name may be NULL if someone does
	   "interface=" to disable all interfaces except loop. */
	new->name = opt_string_alloc(arg);
	new->isloop = new->used = 0;
	arg = comma;
      } while (arg);
      break;
      
    case 'I':  /* --except-interface */
    case '2':  /* --no-dhcp-interface */
      do {
	struct iname *new = opt_malloc(sizeof(struct iname));
	comma = split(arg);
	new->name = opt_string_alloc(arg);
	if (option == 'I')
	  {
	    new->next = daemon->if_except;
	    daemon->if_except = new;
	  }
	else
	  {
	    new->next = daemon->dhcp_except;
	    daemon->dhcp_except = new;
	  }
	arg = comma;
      } while (arg);
      break;
      
    case 'B':  /* --bogus-nxdomain */
      {
	struct in_addr addr;
	unhide_metas(arg);
	if (arg && (addr.s_addr = inet_addr(arg)) != (in_addr_t)-1)
	  {
	    struct bogus_addr *baddr = opt_malloc(sizeof(struct bogus_addr));
	    baddr->next = daemon->bogus_addr;
	    daemon->bogus_addr = baddr;
	    baddr->addr = addr;
	  }
	else
	  option = '?'; /* error */
	break;	
      }
      
    case 'a':  /* --listen-address */
      do {
	struct iname *new = opt_malloc(sizeof(struct iname));
	comma = split(arg);
	unhide_metas(arg);
	new->next = daemon->if_addrs;
	if (arg && (new->addr.in.sin_addr.s_addr = inet_addr(arg)) != (in_addr_t)-1)
	  {
	    new->addr.sa.sa_family = AF_INET;
#ifdef HAVE_SOCKADDR_SA_LEN
	    new->addr.in.sin_len = sizeof(new->addr.in);
#endif
	  }
#ifdef HAVE_IPV6
	else if (arg && inet_pton(AF_INET6, arg, &new->addr.in6.sin6_addr) > 0)
	  {
	    new->addr.sa.sa_family = AF_INET6;
	    new->addr.in6.sin6_flowinfo = 0;
	    new->addr.in6.sin6_scope_id = 0;
#ifdef HAVE_SOCKADDR_SA_LEN
	    new->addr.in6.sin6_len = sizeof(new->addr.in6);
#endif
	  }
#endif
	else
	  {
	    option = '?'; /* error */
	    break;
	  }
	
	daemon->if_addrs = new;
	arg = comma;
      } while (arg);
      break;
      
    case 'S':            /*  --server */
    case LOPT_LOCAL:     /*  --local */
    case 'A':            /*  --address */
    case LOPT_NO_REBIND: /*  --rebind-domain-ok */
      {
	struct server *serv, *newlist = NULL;
	
	unhide_metas(arg);
	
	if (arg && (*arg == '/' || option == LOPT_NO_REBIND))
	  {
	    int rebind = !(*arg == '/');
	    char *end = NULL;
	    if (!rebind)
	      arg++;
	    while (rebind || (end = split_chr(arg, '/')))
	      {
		char *domain = NULL;
		/* elide leading dots - they are implied in the search algorithm */
		while (*arg == '.') arg++;
		/* # matches everything and becomes a zero length domain string */
		if (strcmp(arg, "#") == 0)
		  domain = "";
		else if (strlen (arg) != 0 && !(domain = canonicalise_opt(arg)))
		  option = '?';
		serv = opt_malloc(sizeof(struct server));
		memset(serv, 0, sizeof(struct server));
		serv->next = newlist;
		newlist = serv;
		serv->domain = domain;
		serv->flags = domain ? SERV_HAS_DOMAIN : SERV_FOR_NODOTS;
		arg = end;
		if (rebind)
		  break;
	      }
	    if (!newlist)
	      {
		option = '?';
		break;
	      }
	    
	  }
	else
	  {
	    newlist = opt_malloc(sizeof(struct server));
	    memset(newlist, 0, sizeof(struct server));
	  }
	
	if (option == 'A')
	  {
	    newlist->flags |= SERV_LITERAL_ADDRESS;
	    if (!(newlist->flags & SERV_TYPE))
	      option = '?';
	  }
	else if (option == LOPT_NO_REBIND)
	  newlist->flags |= SERV_NO_REBIND;
	
	if (!arg || !*arg)
	  {
	    if (!(newlist->flags & SERV_NO_REBIND))
	      newlist->flags |= SERV_NO_ADDR; /* no server */
	    if (newlist->flags & SERV_LITERAL_ADDRESS)
	      option = '?';
	  }

	else if (strcmp(arg, "#") == 0)
	  {
	    newlist->flags |= SERV_USE_RESOLV; /* treat in ordinary way */
	    if (newlist->flags & SERV_LITERAL_ADDRESS)
	      option = '?';
	  }
	else
	  {
	    int source_port = 0, serv_port = NAMESERVER_PORT;
	    char *portno, *source;
#ifdef HAVE_IPV6
	    int scope_index = 0;
	    char *scope_id;
#endif
	    
	    if ((source = split_chr(arg, '@')) && /* is there a source. */
		(portno = split_chr(source, '#')) &&
		!atoi_check16(portno, &source_port))
	      problem = _("bad port");
	       	    
	    if ((portno = split_chr(arg, '#')) && /* is there a port no. */
		!atoi_check16(portno, &serv_port))
	      problem = _("bad port");
	    
#ifdef HAVE_IPV6
	    scope_id = split_chr(arg, '%');
#endif

	    if ((newlist->addr.in.sin_addr.s_addr = inet_addr(arg)) != (in_addr_t) -1)
	      {
		newlist->addr.in.sin_port = htons(serv_port);	
		newlist->source_addr.in.sin_port = htons(source_port); 
		newlist->addr.sa.sa_family = newlist->source_addr.sa.sa_family = AF_INET;
#ifdef HAVE_SOCKADDR_SA_LEN
		newlist->source_addr.in.sin_len = newlist->addr.in.sin_len = sizeof(struct sockaddr_in);
#endif
		if (source)
		  {
		    newlist->flags |= SERV_HAS_SOURCE;
		    if ((newlist->source_addr.in.sin_addr.s_addr = inet_addr(source)) == (in_addr_t) -1)
		      {
#if defined(SO_BINDTODEVICE)
			newlist->source_addr.in.sin_addr.s_addr = INADDR_ANY;
			strncpy(newlist->interface, source, IF_NAMESIZE - 1);
#else
			problem = _("interface binding not supported");
#endif
		      }
		  }
		else
		  newlist->source_addr.in.sin_addr.s_addr = INADDR_ANY;
	      }
#ifdef HAVE_IPV6
	    else if (inet_pton(AF_INET6, arg, &newlist->addr.in6.sin6_addr) > 0)
	      {
		if (scope_id && (scope_index = if_nametoindex(scope_id)) == 0)
		  problem = _("bad interface name");
		
		newlist->addr.in6.sin6_port = htons(serv_port);
		newlist->addr.in6.sin6_scope_id = scope_index;
		newlist->source_addr.in6.sin6_port = htons(source_port);
		newlist->source_addr.in6.sin6_scope_id = 0;
		newlist->addr.sa.sa_family = newlist->source_addr.sa.sa_family = AF_INET6;
		newlist->addr.in6.sin6_flowinfo = newlist->source_addr.in6.sin6_flowinfo = 0;
#ifdef HAVE_SOCKADDR_SA_LEN
		newlist->addr.in6.sin6_len = newlist->source_addr.in6.sin6_len = sizeof(newlist->addr.in6);
#endif
		if (source)
		  {
		    newlist->flags |= SERV_HAS_SOURCE;
		    if (inet_pton(AF_INET6, source, &newlist->source_addr.in6.sin6_addr) == 0)
		      {
#if defined(SO_BINDTODEVICE)
			newlist->source_addr.in6.sin6_addr = in6addr_any; 
			strncpy(newlist->interface, source, IF_NAMESIZE - 1);
#else
			problem = _("interface binding not supported");
#endif
		      }
		  }
		else
		  newlist->source_addr.in6.sin6_addr = in6addr_any; 
	      }
#endif
	    else
	      option = '?'; /* error */
	  }
	
	serv = newlist;
	while (serv->next)
	  {
	    serv->next->flags = serv->flags;
	    serv->next->addr = serv->addr;
	    serv->next->source_addr = serv->source_addr;
	    serv = serv->next;
	  }
	serv->next = daemon->servers;
	daemon->servers = newlist;
	break;
      }
      
    case 'c':  /* --cache-size */
      {
	int size;
	
	if (!atoi_check(arg, &size))
	  option = '?';
	else
	  {
	    /* zero is OK, and means no caching. */
	    
	    if (size < 0)
	      size = 0;
	    else if (size > 10000)
	      size = 10000;
	    
	    daemon->cachesize = size;
	  }
	break;
      }
      
    case 'p':  /* --port */
      if (!atoi_check16(arg, &daemon->port))
	option = '?';
      break;
    
    case LOPT_MINPORT:  /* --min-port */
      if (!atoi_check16(arg, &daemon->min_port))
	option = '?';
      break;

    case '0':  /* --dns-forward-max */
      if (!atoi_check(arg, &daemon->ftabsize))
	option = '?';
      break;  
    
    case LOPT_MAX_LOGS:  /* --log-async */
      daemon->max_logs = LOG_MAX; /* default */
      if (arg && !atoi_check(arg, &daemon->max_logs))
	option = '?';
      else if (daemon->max_logs > 100)
	daemon->max_logs = 100;
      break;  

    case 'P': /* --edns-packet-max */
      {
	int i;
	if (!atoi_check(arg, &i))
	  option = '?';
	daemon->edns_pktsz = (unsigned short)i;	
	break;
      }
      
    case 'Q':  /* --query-port */
      if (!atoi_check16(arg, &daemon->query_port))
	option = '?';
      /* if explicitly set to zero, use single OS ephemeral port
	 and disable random ports */
      if (daemon->query_port == 0)
	daemon->osport = 1;
      break;
      
    case 'T':         /* --local-ttl */
    case LOPT_NEGTTL: /* --neg-ttl */
    case LOPT_MAXTTL: /* --max-ttl */
      {
	int ttl;
	if (!atoi_check(arg, &ttl))
	  option = '?';
	else if (option == LOPT_NEGTTL)
	  daemon->neg_ttl = (unsigned long)ttl;
	else if (option == LOPT_MAXTTL)
	  daemon->max_ttl = (unsigned long)ttl;
	else
	  daemon->local_ttl = (unsigned long)ttl;
	break;
      }
      
#ifdef HAVE_DHCP
    case 'X': /* --dhcp-lease-max */
      if (!atoi_check(arg, &daemon->dhcp_max))
	option = '?';
      break;
#endif
      
#ifdef HAVE_TFTP
    case LOPT_TFTP:  /* --enable-tftp */
      if (arg)
	{
	  struct interface_list *new = opt_malloc(sizeof(struct interface_list));
	  new->interface = opt_string_alloc(arg);
	  new->next = daemon->tftp_interfaces;
	  daemon->tftp_interfaces = new;
	}
      else
	daemon->tftp_unlimited = 1;
      break;

    case LOPT_TFTP_MAX:  /*  --tftp-max */
      if (!atoi_check(arg, &daemon->tftp_max))
	option = '?';
      break;  

    case LOPT_PREFIX: /* --tftp-prefix */
      comma = split(arg);
      if (comma)
	{
	  struct tftp_prefix *new = opt_malloc(sizeof(struct tftp_prefix));
	  new->interface = opt_string_alloc(comma);
	  new->prefix = opt_string_alloc(arg);
	  new->next = daemon->if_prefix;
	  daemon->if_prefix = new;
	}
      else
	daemon->tftp_prefix = opt_string_alloc(arg);
      break;

    case LOPT_TFTPPORTS: /* --tftp-port-range */
      if (!(comma = split(arg)) || 
	  !atoi_check16(arg, &daemon->start_tftp_port) ||
	  !atoi_check16(comma, &daemon->end_tftp_port))
	problem = _("bad port range");
      
      if (daemon->start_tftp_port > daemon->end_tftp_port)
	{
	  int tmp = daemon->start_tftp_port;
	  daemon->start_tftp_port = daemon->end_tftp_port;
	  daemon->end_tftp_port = tmp;
	} 
      
      break;
#endif
	      
    case LOPT_BRIDGE:   /* --bridge-interface */
      {
	struct dhcp_bridge *new = opt_malloc(sizeof(struct dhcp_bridge));
	if (!(comma = split(arg)) || strlen(arg) > IF_NAMESIZE - 1 )
	  {
	    problem = _("bad bridge-interface");
	    break;
	  }
	
	strcpy(new->iface, arg);
	new->alias = NULL;
	new->next = daemon->bridges;
	daemon->bridges = new;

	do {
	  arg = comma;
	  comma = split(arg);
	  if (strlen(arg) != 0 && strlen(arg) <= IF_NAMESIZE - 1)
	    {
	      struct dhcp_bridge *b = opt_malloc(sizeof(struct dhcp_bridge)); 
	      b->next = new->alias;
	      new->alias = b;
	      strcpy(b->iface, arg);
	    }
	} while (comma);
	
	break;
      }

#ifdef HAVE_DHCP
    case 'F':  /* --dhcp-range */
      {
	int k, leasepos = 2;
	char *cp, *a[5] = { NULL, NULL, NULL, NULL, NULL };
	struct dhcp_context *new = opt_malloc(sizeof(struct dhcp_context));
	
	memset (new, 0, sizeof(*new));
	new->lease_time = DEFLEASE;
	
	gen_prob = _("bad dhcp-range");
	
	if (!arg)
	  {
	    option = '?';
	    break;
	  }
	
	while(1)
	  {
	    for (cp = arg; *cp; cp++)
	      if (!(*cp == ' ' || *cp == '.' || *cp == ':' || 
		    (*cp >= 'a' && *cp <= 'f') || (*cp >= 'A' && *cp <= 'F') ||
		    (*cp >='0' && *cp <= '9')))
		break;
	    
	    if (*cp != ',' && (comma = split(arg)))
	      {
		if (strstr(arg, "interface:") == arg)
		  new->interface = opt_string_alloc(arg+10);
		else if (is_tag_prefix(arg))
		  {
		    struct dhcp_netid *tt = opt_malloc(sizeof (struct dhcp_netid));
		    tt->net = opt_string_alloc(arg+4);
		    tt->next = new->filter;
		    new->filter = tt;
		  }
		else
		  {
		    if (new->netid.net)
		      problem = _("only one tag allowed");
		    else if (strstr(arg, "set:") == arg)
		      new->netid.net = opt_string_alloc(arg+4);
		    else
		      new->netid.net = opt_string_alloc(arg);
		  }
		arg = comma;
	      }
	    else
	      {
		a[0] = arg;
		break;
	      }
	  }
	
	for (k = 1; k < 5; k++)
	  if (!(a[k] = split(a[k-1])))
	    break;
	
	if (k < 2)
	  option = '?';
	else if (inet_pton(AF_INET, a[0], &new->start))
	  {
	    new->next = daemon->dhcp;
	    daemon->dhcp = new;
	    if (strcmp(a[1], "static") == 0)
	      {
		new->end = new->start;
		new->flags |= CONTEXT_STATIC;
	      }
	    else if (strcmp(a[1], "proxy") == 0)
	      {
		new->end = new->start;
		new->flags |= CONTEXT_PROXY;
	      }
	    else if ((new->end.s_addr = inet_addr(a[1])) == (in_addr_t)-1)
	      option = '?';
	    
	    if (ntohl(new->start.s_addr) > ntohl(new->end.s_addr))
	      {
		struct in_addr tmp = new->start;
		new->start = new->end;
		new->end = tmp;
	      }
	    
	    if (option != '?' && k >= 3 && strchr(a[2], '.') &&  
		((new->netmask.s_addr = inet_addr(a[2])) != (in_addr_t)-1))
	      {
		new->flags |= CONTEXT_NETMASK;
		leasepos = 3;
		if (!is_same_net(new->start, new->end, new->netmask))
		  problem = _("inconsistent DHCP range");
	      }
	    
	    if (k >= 4 && strchr(a[3], '.') &&  
		((new->broadcast.s_addr = inet_addr(a[3])) != (in_addr_t)-1))
	      {
		new->flags |= CONTEXT_BRDCAST;
		leasepos = 4;
	      }
	  }
#ifdef HAVE_DHCP6
	else if (inet_pton(AF_INET6, a[0], &new->start6))
	  {
	    new->next = daemon->dhcp6;
	    new->prefix = 64; /* default */
	    daemon->dhcp6 = new;
	    if (strcmp(a[1], "static") == 0)
	      {
		new->end = new->start;
		new->flags |= CONTEXT_STATIC;
	      }
	    else if (!inet_pton(AF_INET6, a[1], &new->end6))
	      option = '?';
	    
	    /* bare integer < 128 is prefix value */
	    if (option != '?' && k >= 3)
	      {
		int pref;
		for (cp = a[2]; *cp; cp++)
		  if (!(*cp >= '0' && *cp <= '9'))
		    break;
		if (!*cp && (pref = atoi(a[2])) <= 128)
		  {
		    new->prefix = pref;
		    leasepos = 3;
		    if (new->prefix < 64)
		      problem = _("prefix must be at least 64");
		  }
	      }
	    if (!is_same_net6(&new->start6, &new->end6, new->prefix))
	      problem = _("inconsistent DHCP range");

	    if (addr6part(&new->start6) > addr6part(&new->end6))
	      {
		struct in6_addr tmp = new->start6;
		new->start6 = new->end6;
		new->end6 = tmp;
	      }
	  }
#endif
	
	if (k >= leasepos+1)
	  {
	    if (strcmp(a[leasepos], "infinite") == 0)
	      new->lease_time = 0xffffffff;
	    else
	      {
		int fac = 1;
		if (strlen(a[leasepos]) > 0)
		  {
		    switch (a[leasepos][strlen(a[leasepos]) - 1])
		      {
		      case 'd':
		      case 'D':
			fac *= 24;
			/* fall though */
		      case 'h':
		      case 'H':
			fac *= 60;
			/* fall through */
		      case 'm':
		      case 'M':
			fac *= 60;
			/* fall through */
		      case 's':
		      case 'S':
			a[leasepos][strlen(a[leasepos]) - 1] = 0;
		      }
		    
		    new->lease_time = atoi(a[leasepos]) * fac;
		    /* Leases of a minute or less confuse
		       some clients, notably Apple's */
		    if (new->lease_time < 120)
		      new->lease_time = 120;
		  }
	      }
	  }
	break;
      }

    case LOPT_BANK:
    case 'G':  /* --dhcp-host */
      {
	int j, k = 0;
	char *a[6] = { NULL, NULL, NULL, NULL, NULL, NULL };
	struct dhcp_config *new;
	struct in_addr in;
	
	new = opt_malloc(sizeof(struct dhcp_config));
	
	new->next = daemon->dhcp_conf;
	new->flags = (option == LOPT_BANK) ? CONFIG_BANK : 0;
	new->hwaddr = NULL;
	new->netid = NULL;

	if ((a[0] = arg))
	  for (k = 1; k < 6; k++)
	    if (!(a[k] = split(a[k-1])))
	      break;
	
	for (j = 0; j < k; j++)
	  if (strchr(a[j], ':')) /* ethernet address, netid or binary CLID */
	    {
	      char *arg = a[j];
	      
	      if ((arg[0] == 'i' || arg[0] == 'I') &&
		  (arg[1] == 'd' || arg[1] == 'D') &&
		  arg[2] == ':')
		{
		  if (arg[3] == '*')
		    new->flags |= CONFIG_NOCLID;
		  else
		    {
		      int len;
		      arg += 3; /* dump id: */
		      if (strchr(arg, ':'))
			len = parse_hex(arg, (unsigned char *)arg, -1, NULL, NULL);
		      else
			{
			  unhide_metas(arg);
			  len = (int) strlen(arg);
			}

		      if (len == -1)
			problem = _("bad hex constant");
		      else if ((new->clid = opt_malloc(len)))
			{
			  new->flags |= CONFIG_CLID;
			  new->clid_len = len;
			  memcpy(new->clid, arg, len);
			}
		    }
		}
	      /* dhcp-host has strange backwards-compat needs. */
	      else if (strstr(arg, "net:") == arg || strstr(arg, "set:") == arg)
		{
		  struct dhcp_netid *newtag = opt_malloc(sizeof(struct dhcp_netid));
		  struct dhcp_netid_list *newlist = opt_malloc(sizeof(struct dhcp_netid_list));
		  newtag->net = opt_malloc(strlen(arg + 4) + 1);
		  newlist->next = new->netid;
		  new->netid = newlist;
		  newlist->list = newtag;
		  strcpy(newtag->net, arg+4);
		  unhide_metas(newtag->net);
		}
	      else if (strstr(arg, "tag:") == arg)
		problem = _("cannot match tags in --dhcp-host");
#ifdef HAVE_DHCP6
	      else if (arg[0] == '[' && arg[strlen(arg)-1] == ']')
		{
		  arg[strlen(arg)-1] = 0;
		  arg++;
		  
		  if (!inet_pton(AF_INET6, arg, &new->addr6))
		    problem = _("bad IPv6 address");
		  
		  new->flags |= CONFIG_ADDR6;
		}
#endif
	      else
		{
		  struct hwaddr_config *newhw = opt_malloc(sizeof(struct hwaddr_config));
		  if ((newhw->hwaddr_len = parse_hex(a[j], newhw->hwaddr, DHCP_CHADDR_MAX, 
						     &newhw->wildcard_mask, &newhw->hwaddr_type)) == -1)
		    problem = _("bad hex constant");
		  else
		    {
		      
		      newhw->next = new->hwaddr;
		      new->hwaddr = newhw;
		    }		    
		}
	    }
	  else if (strchr(a[j], '.') && (in.s_addr = inet_addr(a[j])) != (in_addr_t)-1)
	    {
	      new->addr = in;
	      new->flags |= CONFIG_ADDR;
	    }
	  else
	    {
	      char *cp, *lastp = NULL, last = 0;
	      int fac = 1;
	      
	      if (strlen(a[j]) > 1)
		{
		  lastp = a[j] + strlen(a[j]) - 1;
		  last = *lastp;
		  switch (last)
		    {
		    case 'd':
		    case 'D':
		      fac *= 24;
		      /* fall through */
		    case 'h':
		    case 'H':
		      fac *= 60;
		      /* fall through */
		    case 'm':
		    case 'M':
		      fac *= 60;
		      /* fall through */
		    case 's':
		    case 'S':
		      *lastp = 0;
		    }
		}
	      
	      for (cp = a[j]; *cp; cp++)
		if (!isdigit((unsigned char)*cp) && *cp != ' ')
		  break;
	      
	      if (*cp)
		{
		  if (lastp)
		    *lastp = last;
		  if (strcmp(a[j], "infinite") == 0)
		    {
		      new->lease_time = 0xffffffff;
		      new->flags |= CONFIG_TIME;
		    }
		  else if (strcmp(a[j], "ignore") == 0)
		    new->flags |= CONFIG_DISABLE;
		  else
		    {
		      if (!(new->hostname = canonicalise_opt(a[j])) ||
			  !legal_hostname(new->hostname))
			problem = _("bad DHCP host name");
		      else
			new->flags |= CONFIG_NAME;
		      new->domain = NULL;			
		    }
		}
	      else
		{
		  new->lease_time = atoi(a[j]) * fac; 
		  /* Leases of a minute or less confuse
		     some clients, notably Apple's */
		  if (new->lease_time < 120)
		    new->lease_time = 120;
		  new->flags |= CONFIG_TIME;
		}
	    }
	
	daemon->dhcp_conf = new;
	break;
      }

    case LOPT_TAG_IF:  /* --tag-if */
      {
	struct tag_if *new = opt_malloc(sizeof(struct tag_if));
		
	new->tag = NULL;
	new->set = NULL;
	new->next = NULL;
	
	/* preserve order */
	if (!daemon->tag_if)
	  daemon->tag_if = new;
	else
	  {
	    struct tag_if *tmp;
	    for (tmp = daemon->tag_if; tmp->next; tmp = tmp->next);
	    tmp->next = new;
	  }

	while (arg)
	  {
	    size_t len;

	    comma = split(arg);
	    len = strlen(arg);

	    if (len < 5)
	      {
		new->set = NULL;
		break;
	      }
	    else
	      {
		struct dhcp_netid *newtag = opt_malloc(sizeof(struct dhcp_netid));
		newtag->net = opt_malloc(len - 3);
		strcpy(newtag->net, arg+4);
		unhide_metas(newtag->net);

		if (strstr(arg, "set:") == arg)
		  {
		    struct dhcp_netid_list *newlist = opt_malloc(sizeof(struct dhcp_netid_list));
		    newlist->next = new->set;
		    new->set = newlist;
		    newlist->list = newtag;
		  }
		else if (strstr(arg, "tag:") == arg)
		  {
		    newtag->next = new->tag;
		    new->tag = newtag;
		  }
		else 
		  {
		    new->set = NULL;
		    break;
		  }
	      }
	    
	    arg = comma;
	  }

	if (!new->set)
	  problem = _("bad tag-if");
	  
	break;
      }

      
    case 'O':           /* --dhcp-option */
    case LOPT_FORCE:    /* --dhcp-option-force */
    case LOPT_OPTS:
    case LOPT_MATCH:    /* --dhcp-match */
      problem = parse_dhcp_opt(arg, 
			       option == LOPT_FORCE ? DHOPT_FORCE : 
			       (option == LOPT_MATCH ? DHOPT_MATCH :
			       (option == LOPT_OPTS ? DHOPT_BANK : 0)));
      break;
      
    case 'M': /* --dhcp-boot */
      {
	struct dhcp_netid *id = NULL;
	while (is_tag_prefix(arg))
	  {
	    struct dhcp_netid *newid = opt_malloc(sizeof(struct dhcp_netid));
	    newid->next = id;
	    id = newid;
	    comma = split(arg);
	    newid->net = opt_string_alloc(arg+4);
	    arg = comma;
	  };
	
	if (!arg)
	  option = '?';
	else 
	  {
	    char *dhcp_file, *dhcp_sname = NULL, *tftp_sname = NULL;
	    struct in_addr dhcp_next_server;
	    comma = split(arg);
	    dhcp_file = opt_string_alloc(arg);
	    dhcp_next_server.s_addr = 0;
	    if (comma)
	      {
		arg = comma;
		comma = split(arg);
		dhcp_sname = opt_string_alloc(arg);
		if (comma)
		  {
		    unhide_metas(comma);
		    if ((dhcp_next_server.s_addr = inet_addr(comma)) == (in_addr_t)-1) {

		      /*
		       * The user may have specified the tftp hostname here.
		       * save it so that it can be resolved/looked up during
		       * actual dhcp_reply().
		       */	

		      tftp_sname = opt_string_alloc(comma);
		      dhcp_next_server.s_addr = 0;
		    }
		  }
	      }
	    if (option != '?')
	      {
		struct dhcp_boot *new = opt_malloc(sizeof(struct dhcp_boot));
		new->file = dhcp_file;
		new->sname = dhcp_sname;
		new->tftp_sname = tftp_sname;
		new->next_server = dhcp_next_server;
		new->netid = id;
		new->next = daemon->boot_config;
		daemon->boot_config = new;
	      }
	  }
	
	break;
      }

    case LOPT_PXE_PROMT:  /* --pxe-prompt */
       {
	 struct dhcp_opt *new = opt_malloc(sizeof(struct dhcp_opt));
	 int timeout;

	 new->netid = NULL;
	 new->opt = 10; /* PXE_MENU_PROMPT */

	 while (is_tag_prefix(arg))
	  {
	     struct dhcp_netid *nn = opt_malloc(sizeof (struct dhcp_netid));
	     comma = split(arg);
	     nn->next = new->netid;
	     new->netid = nn;
	     nn->net = opt_string_alloc(arg+4);
	     arg = comma;
	   }
	 
	 if (!arg)
	   option = '?';
	 else
	   {
	     comma = split(arg);
	     unhide_metas(arg);
	     new->len = strlen(arg) + 1;
	     new->val = opt_malloc(new->len);
	     memcpy(new->val + 1, arg, new->len - 1);
	     
	     new->u.vendor_class = (unsigned char *)"PXEClient";
	     new->flags = DHOPT_VENDOR;
	     
	     if (comma && atoi_check(comma, &timeout))
	       *(new->val) = timeout;
	     else
	       *(new->val) = 255;

	     new->next = daemon->dhcp_opts;
	     daemon->dhcp_opts = new;
	     daemon->enable_pxe = 1;
	   }
	 
	 break;
       }
       
    case LOPT_PXE_SERV:  /* --pxe-service */
       {
	 struct pxe_service *new = opt_malloc(sizeof(struct pxe_service));
	 char *CSA[] = { "x86PC", "PC98", "IA64_EFI", "Alpha", "Arc_x86", "Intel_Lean_Client",
			 "IA32_EFI", "BC_EFI", "Xscale_EFI", "x86-64_EFI", NULL };  
	 static int boottype = 32768;
	 
	 new->netid = NULL;
	 new->server.s_addr = 0;

	 while (is_tag_prefix(arg))
	   {
	     struct dhcp_netid *nn = opt_malloc(sizeof (struct dhcp_netid));
	     comma = split(arg);
	     nn->next = new->netid;
	     new->netid = nn;
	     nn->net = opt_string_alloc(arg+4);
	     arg = comma;
	   }
       
	 if (arg && (comma = split(arg)))
	   {
	     for (i = 0; CSA[i]; i++)
	       if (strcasecmp(CSA[i], arg) == 0)
		 break;
	     
	     if (CSA[i] || atoi_check(arg, &i))
	       {
		 arg = comma;
		 comma = split(arg);
		 
		 new->CSA = i;
		 new->menu = opt_string_alloc(arg);
		 
		 if (!comma)
		   {
		     new->type = 0; /* local boot */
		     new->basename = NULL;
		   }
		 else
		   {
		     arg = comma;
		     comma = split(arg);
		     if (atoi_check(arg, &i))
		       {
			 new->type = i;
			 new->basename = NULL;
		       }
		     else
		       {
			 new->type = boottype++;
			 new->basename = opt_string_alloc(arg);
		       }
		     
		     if (comma && (new->server.s_addr = inet_addr(comma)) == (in_addr_t)-1)
		       option = '?';
		   }

		 /* Order matters */
		 new->next = NULL;
		 if (!daemon->pxe_services)
		   daemon->pxe_services = new; 
		 else
		   {
		     struct pxe_service *s;
		     for (s = daemon->pxe_services; s->next; s = s->next);
		     s->next = new;
		   }
		 
		 daemon->enable_pxe = 1;
		 break;
		
	       }
	   }
	 
	 option = '?';
	 break;
       }
	 
    case '4':  /* --dhcp-mac */
      {
	if (!(comma = split(arg)))
	  option = '?';
	else
	  {
	    struct dhcp_mac *new = opt_malloc(sizeof(struct dhcp_mac));
	    new->netid.net = opt_string_alloc(set_prefix(arg));
	    unhide_metas(comma);
	    new->hwaddr_len = parse_hex(comma, new->hwaddr, DHCP_CHADDR_MAX, &new->mask, &new->hwaddr_type);
	    if (new->hwaddr_len == -1)
	      option = '?';
	    else
	      {
		new->next = daemon->dhcp_macs;
		daemon->dhcp_macs = new;
	      }
	  }
      }
      break;
      
    case 'U':           /* --dhcp-vendorclass */
    case 'j':           /* --dhcp-userclass */
    case LOPT_CIRCUIT:  /* --dhcp-circuitid */
    case LOPT_REMOTE:   /* --dhcp-remoteid */
    case LOPT_SUBSCR:   /* --dhcp-subscrid */
      {
	if (!(comma = split(arg)))
	  option = '?';
	else
	  {
	    unsigned char *p;
	    int dig = 0;
	    struct dhcp_vendor *new = opt_malloc(sizeof(struct dhcp_vendor));
	    new->netid.net = opt_string_alloc(set_prefix(arg));
	    /* check for hex string - must digits may include : must not have nothing else, 
	       only allowed for agent-options. */
	    for (p = (unsigned char *)comma; *p; p++)
	      if (isxdigit(*p))
		dig = 1;
	      else if (*p != ':')
		break;
	    unhide_metas(comma);
	    if (option == 'U' || option == 'j' || *p || !dig)
	      {
		new->len = strlen(comma);  
		new->data = opt_malloc(new->len);
		memcpy(new->data, comma, new->len);
	      }
	    else
	      {
		new->len = parse_hex(comma, (unsigned char *)comma, strlen(comma), NULL, NULL);
		new->data = opt_malloc(new->len);
		memcpy(new->data, comma, new->len);
	      }

	    switch (option)
	      {
	      case 'j':
		new->match_type = MATCH_USER;
		break;
	      case 'U':
		new->match_type = MATCH_VENDOR;
		break; 
	      case LOPT_CIRCUIT:
		new->match_type = MATCH_CIRCUIT;
		break;
	      case LOPT_REMOTE:
		new->match_type = MATCH_REMOTE;
		break;
	      case LOPT_SUBSCR:
		new->match_type = MATCH_SUBSCRIBER;
		break;
	      }
	    new->next = daemon->dhcp_vendors;
	    daemon->dhcp_vendors = new;
	  }
	break;
      }
      
    case LOPT_ALTPORT:   /* --dhcp-alternate-port */
      if (!arg)
	{
	  daemon->dhcp_server_port = DHCP_SERVER_ALTPORT;
	  daemon->dhcp_client_port = DHCP_CLIENT_ALTPORT;
	}
      else
	{
	  comma = split(arg);
	  if (!atoi_check16(arg, &daemon->dhcp_server_port) || 
	      (comma && !atoi_check16(comma, &daemon->dhcp_client_port)))
	    problem = _("invalid port number");
	  if (!comma)
	    daemon->dhcp_client_port = daemon->dhcp_server_port+1; 
	}
      break;

    case 'J':            /* --dhcp-ignore */
    case LOPT_NO_NAMES:  /* --dhcp-ignore-names */
    case LOPT_BROADCAST: /* --dhcp-broadcast */
    case '3':            /* --bootp-dynamic */
    case LOPT_GEN_NAMES: /* --dhcp-generate-names */
      {
	struct dhcp_netid_list *new = opt_malloc(sizeof(struct dhcp_netid_list));
	struct dhcp_netid *list = NULL;
	if (option == 'J')
	  {
	    new->next = daemon->dhcp_ignore;
	    daemon->dhcp_ignore = new;
	  }
	else if (option == LOPT_BROADCAST)
	  {
	    new->next = daemon->force_broadcast;
	    daemon->force_broadcast = new;
	  }
	else if (option == '3')
	  {
	    new->next = daemon->bootp_dynamic;
	    daemon->bootp_dynamic = new;
	  }
	else if (option == LOPT_GEN_NAMES)
	  {
	    new->next = daemon->dhcp_gen_names;
	    daemon->dhcp_gen_names = new;
	  }
	else
	  {
	    new->next = daemon->dhcp_ignore_names;
	    daemon->dhcp_ignore_names = new;
	  }
	
	while (arg) {
	  struct dhcp_netid *member = opt_malloc(sizeof(struct dhcp_netid));
	  comma = split(arg);
	  member->next = list;
	  list = member;
	  if (is_tag_prefix(arg))
	    member->net = opt_string_alloc(arg+4);
	  else
	    member->net = opt_string_alloc(arg);
	  arg = comma;
	}
	
	new->list = list;
	break;
      }

    case LOPT_PROXY: /* --dhcp-proxy */
      daemon->override = 1;
      while (arg) {
	struct addr_list *new = opt_malloc(sizeof(struct addr_list));
	comma = split(arg);
	if ((new->addr.s_addr = inet_addr(arg)) == (in_addr_t)-1)
	  problem = _("bad dhcp-proxy address");
	new->next = daemon->override_relays;
	daemon->override_relays = new;
	arg = comma;
      }
      break;
#endif
      
    case 'V':  /* --alias */
      {
	char *dash, *a[3] = { NULL, NULL, NULL };
	int k = 0;
	struct doctor *new = opt_malloc(sizeof(struct doctor));
	new->next = daemon->doctors;
	daemon->doctors = new;
	new->mask.s_addr = 0xffffffff;
	new->end.s_addr = 0;

	if ((a[0] = arg))
	  for (k = 1; k < 3; k++)
	    {
	      if (!(a[k] = split(a[k-1])))
		break;
	      unhide_metas(a[k]);
	    }
	
	dash = split_chr(a[0], '-');

	if ((k < 2) || 
	    ((new->in.s_addr = inet_addr(a[0])) == (in_addr_t)-1) ||
	    ((new->out.s_addr = inet_addr(a[1])) == (in_addr_t)-1))
	  option = '?';
	
	if (k == 3)
	  new->mask.s_addr = inet_addr(a[2]);
	
	if (dash && 
	    ((new->end.s_addr = inet_addr(dash)) == (in_addr_t)-1 ||
	     !is_same_net(new->in, new->end, new->mask) ||
	     ntohl(new->in.s_addr) > ntohl(new->end.s_addr)))
	  problem = _("invalid alias range");
	
	break;
      }
      
    case LOPT_INTNAME:  /* --interface-name */
      {
	struct interface_name *new, **up;
	char *domain = NULL;

	comma = split(arg);
	
	if (!comma || !(domain = canonicalise_opt(arg)))
	  problem = _("bad interface name");
	
	new = opt_malloc(sizeof(struct interface_name));
	new->next = NULL;
	/* Add to the end of the list, so that first name
	   of an interface is used for PTR lookups. */
	for (up = &daemon->int_names; *up; up = &((*up)->next));
	*up = new;
	new->name = domain;
	new->intr = opt_string_alloc(comma);
	break;
      }
      
    case LOPT_CNAME: /* --cname */
      {
	struct cname *new;
	
	if (!(comma = split(arg)))
	  option = '?';
	else
	  {
	    char *alias = canonicalise_opt(arg);
	    char *target = canonicalise_opt(comma);
	    
	    if (!alias || !target)
	      problem = _("bad CNAME");
	    else
	      {
		for (new = daemon->cnames; new; new = new->next)
		  if (hostname_isequal(new->alias, arg))
		    problem = _("duplicate CNAME");
		new = opt_malloc(sizeof(struct cname));
		new->next = daemon->cnames;
		daemon->cnames = new;
		new->alias = alias;
		new->target = target;
	      }
	  }
	break;
      }

    case LOPT_PTR:  /* --ptr-record */
      {
	struct ptr_record *new;
	char *dom, *target = NULL;

	comma = split(arg);
	
	if (!(dom = canonicalise_opt(arg)) ||
	    (comma && !(target = canonicalise_opt(comma))))
	  problem = _("bad PTR record");
	else
	  {
	    new = opt_malloc(sizeof(struct ptr_record));
	    new->next = daemon->ptr;
	    daemon->ptr = new;
	    new->name = dom;
	    new->ptr = target;
	  }
	break;
      }

    case LOPT_NAPTR: /* --naptr-record */
      {
	char *a[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL };
	int k = 0;
	struct naptr *new;
	int order, pref;
	char *name, *replace = NULL;

	if ((a[0] = arg))
	  for (k = 1; k < 7; k++)
	    if (!(a[k] = split(a[k-1])))
	      break;
	
	
	if (k < 6 || 
	    !(name = canonicalise_opt(a[0])) ||
	    !atoi_check16(a[1], &order) || 
	    !atoi_check16(a[2], &pref) ||
	    (k == 7 && !(replace = canonicalise_opt(a[6]))))
	  problem = _("bad NAPTR record");
	else
	  {
	    new = opt_malloc(sizeof(struct naptr));
	    new->next = daemon->naptr;
	    daemon->naptr = new;
	    new->name = name;
	    new->flags = opt_string_alloc(a[3]);
	    new->services = opt_string_alloc(a[4]);
	    new->regexp = opt_string_alloc(a[5]);
	    new->replace = replace;
	    new->order = order;
	    new->pref = pref;
	  }
	break;
      }
       
    case 'Y':  /* --txt-record */
      {
	struct txt_record *new;
	unsigned char *p, *cnt;
	size_t len;

	comma = split(arg);
		
	new = opt_malloc(sizeof(struct txt_record));
	new->next = daemon->txt;
	daemon->txt = new;
	new->class = C_IN;
	
	if (!(new->name = canonicalise_opt(arg)))
	  {
	    problem = _("bad TXT record");
	    break;
	  }

	len = comma ? strlen(comma) : 0;
	len += (len/255) + 1; /* room for extra counts */
	new->txt = p = opt_malloc(len);

	cnt = p++;
	*cnt = 0;
	
	while (comma && *comma)
	  {
	    unsigned char c = (unsigned char)*comma++;

	    if (c == ',' || *cnt == 255)
	      {
		if (c != ',')
		  comma--;
		cnt = p++;
		*cnt = 0;
	      }
	    else
	      {
		*p++ = unhide_meta(c);
		(*cnt)++;
	      }
	  }

	new->len = p - new->txt;

	break;
      }
      
    case 'W':  /* --srv-host */
      {
	int port = 1, priority = 0, weight = 0;
	char *name, *target = NULL;
	struct mx_srv_record *new;
	
	comma = split(arg);
	
	if (!(name = canonicalise_opt(arg)))
	  problem = _("bad SRV record");
	  
	if (comma)
	  {
	    arg = comma;
	    comma = split(arg);
	    if (!(target = canonicalise_opt(arg))
)	      problem = _("bad SRV target");
		
	    if (comma)
	      {
		arg = comma;
		comma = split(arg);
		if (!atoi_check16(arg, &port))
		  problem = _("invalid port number");
		
		if (comma)
		  {
		    arg = comma;
		    comma = split(arg);
		    if (!atoi_check16(arg, &priority))
		      problem = _("invalid priority");
			
		    if (comma)
		      {
			arg = comma;
			comma = split(arg);
			if (!atoi_check16(arg, &weight))
			  problem = _("invalid weight");
		      }
		  }
	      }
	  }
	
	new = opt_malloc(sizeof(struct mx_srv_record));
	new->next = daemon->mxnames;
	daemon->mxnames = new;
	new->issrv = 1;
	new->name = name;
	new->target = target;
	new->srvport = port;
	new->priority = priority;
	new->weight = weight;
	break;
      }
      
    default:
      return _("unsupported option (check that dnsmasq was compiled with DHCP/TFTP/DBus support)");

    }

  if (problem)
    return problem;
  
  if (option == '?')
    return gen_prob;

  return NULL;
}

static void read_file(char *file, FILE *f, int hard_opt)	
{
  volatile int lineno = 0;
  char *buff = daemon->namebuff;
  
  while (fgets(buff, MAXDNAME, f))
    {
      int white, i, option; ;
      char *errmess, *p, *arg, *start;
      size_t len;

      /* Memory allocation failure longjmps here if mem_recover == 1 */ 
      if (hard_opt)
	{
	  if (setjmp(mem_jmp))
	    continue;
	  mem_recover = 1;
	}
      
      lineno++;
      errmess = NULL;
      
      /* Implement quotes, inside quotes we allow \\ \" \n and \t 
	 metacharacters get hidden also strip comments */
      for (white = 1, p = buff; *p; p++)
	{
	  if (*p == '"')
	    {
	      memmove(p, p+1, strlen(p+1)+1);

	      for(; *p && *p != '"'; p++)
		{
		  if (*p == '\\' && strchr("\"tnebr\\", p[1]))
		    {
		      if (p[1] == 't')
			p[1] = '\t';
		      else if (p[1] == 'n')
			p[1] = '\n';
		      else if (p[1] == 'b')
			p[1] = '\b';
		      else if (p[1] == 'r')
			p[1] = '\r';
		      else if (p[1] == 'e') /* escape */
			p[1] = '\033';
		      memmove(p, p+1, strlen(p+1)+1);
		    }
		  *p = hide_meta(*p);
		}

	      if (*p == 0) 
		{
		  errmess = _("missing \"");
		  goto oops; 
		}

	      memmove(p, p+1, strlen(p+1)+1);
	    }

	  if (isspace(*p))
	    {
	      *p = ' ';
	      white = 1;
	    }
	  else 
	    {
	      if (white && *p == '#')
		{ 
		  *p = 0;
		  break;
		}
	      white = 0;
	    } 
	}

      
      /* strip leading spaces */
      for (start = buff; *start && *start == ' '; start++);
      
      /* strip trailing spaces */
      for (len = strlen(start); (len != 0) && (start[len-1] == ' '); len--);
      
      if (len == 0)
	continue; 
      else
	start[len] = 0;
      
      if (hard_opt != 0)
	arg = start;
      else if ((p=strchr(start, '=')))
	{
	  /* allow spaces around "=" */
	  for (arg = p+1; *arg == ' '; arg++);
	  for (; p >= start && (*p == ' ' || *p == '='); p--)
	    *p = 0;
	}
      else
	arg = NULL;

      if (hard_opt != 0)
	option = hard_opt;
      else
	{
	  for (option = 0, i = 0; opts[i].name; i++) 
	    if (strcmp(opts[i].name, start) == 0)
	      {
		option = opts[i].val;
		break;
	      }
	  
	  if (!option)
	    errmess = _("bad option");
	  else if (opts[i].has_arg == 0 && arg)
	    errmess = _("extraneous parameter");
	  else if (opts[i].has_arg == 1 && !arg)
	    errmess = _("missing parameter");
	}
	  
      if (!errmess)
	errmess = one_opt(option, arg, _("error"), 0);
      
      if (errmess)
	{
	oops:
	  sprintf(buff, _("%s at line %d of %%s"), errmess, lineno);
	  if (hard_opt != 0)
	    my_syslog(LOG_ERR, buff, file);
	  else
	    die(buff, file, EC_BADCONF);
	}
    }

  mem_recover = 0;
  fclose(f);
}

static void one_file(char *file, int hard_opt)
{
  FILE *f;
  int nofile_ok = 0;
  static int read_stdin = 0;
  static struct fileread {
    dev_t dev;
    ino_t ino;
    struct fileread *next;
  } *filesread = NULL;
  
  if (hard_opt == '7')
    {
      /* default conf-file reading */
      hard_opt = 0;
      nofile_ok = 1;
    }

  if (hard_opt == 0 && strcmp(file, "-") == 0)
    {
      if (read_stdin == 1)
	return;
      read_stdin = 1;
      file = "stdin";
      f = stdin;
    }
  else
    {
      /* ignore repeated files. */
      struct stat statbuf;
    
      if (hard_opt == 0 && stat(file, &statbuf) == 0)
	{
	  struct fileread *r;
	  
	  for (r = filesread; r; r = r->next)
	    if (r->dev == statbuf.st_dev && r->ino == statbuf.st_ino)
	      return;
	  
	  r = safe_malloc(sizeof(struct fileread));
	  r->next = filesread;
	  filesread = r;
	  r->dev = statbuf.st_dev;
	  r->ino = statbuf.st_ino;
	}
      
      if (!(f = fopen(file, "r")))
	{   
	  if (errno == ENOENT && nofile_ok)
	    return; /* No conffile, all done. */
	  else
	    {
	      char *str = _("cannot read %s: %s");
	      if (hard_opt != 0)
		{
		  my_syslog(LOG_ERR, str, file, strerror(errno));
		  return;
		}
	      else
		die(str, file, EC_FILE);
	    }
	} 
    }
  
  read_file(file, f, hard_opt);
}

/* expand any name which is a directory */
struct hostsfile *expand_filelist(struct hostsfile *list)
{
  int i;
  struct hostsfile *ah;

  for (i = 0, ah = list; ah; ah = ah->next)
    {
      if (i <= ah->index)
	i = ah->index + 1;

      if (ah->flags & AH_DIR)
	ah->flags |= AH_INACTIVE;
      else
	ah->flags &= ~AH_INACTIVE;
    }

  for (ah = list; ah; ah = ah->next)
    if (!(ah->flags & AH_INACTIVE))
      {
	struct stat buf;
	if (stat(ah->fname, &buf) != -1 && S_ISDIR(buf.st_mode))
	  {
	    DIR *dir_stream;
	    struct dirent *ent;
	    
	    /* don't read this as a file */
	    ah->flags |= AH_INACTIVE;

	    if (!(dir_stream = opendir(ah->fname)))
	      my_syslog(LOG_ERR, _("cannot access directory %s: %s"), 
			ah->fname, strerror(errno));
	    else
	      {
		while ((ent = readdir(dir_stream)))
		  {
		    size_t lendir = strlen(ah->fname);
		    size_t lenfile = strlen(ent->d_name);
		    struct hostsfile *ah1;
		    char *path;
		    
		    /* ignore emacs backups and dotfiles */
		    if (lenfile == 0 || 
			ent->d_name[lenfile - 1] == '~' ||
			(ent->d_name[0] == '#' && ent->d_name[lenfile - 1] == '#') ||
			ent->d_name[0] == '.')
		      continue;
		    
		    /* see if we have an existing record.
		       dir is ah->fname 
		       file is ent->d_name
		       path to match is ah1->fname */
		    
		    for (ah1 = list; ah1; ah1 = ah1->next)
		      {
			if (lendir < strlen(ah1->fname) &&
			    strstr(ah1->fname, ah->fname) == ah1->fname &&
			    ah1->fname[lendir] == '/' &&
			    strcmp(ah1->fname + lendir + 1, ent->d_name) == 0)
			  {
			    ah1->flags &= ~AH_INACTIVE;
			    break;
			  }
		      }
		    
		    /* make new record */
		    if (!ah1)
		      {
			if (!(ah1 = whine_malloc(sizeof(struct hostsfile))))
			  continue;
			
			if (!(path = whine_malloc(lendir + lenfile + 2)))
			  {
			    free(ah1);
			    continue;
			  }
		      	
			strcpy(path, ah->fname);
			strcat(path, "/");
			strcat(path, ent->d_name);
			ah1->fname = path;
			ah1->index = i++;
			ah1->flags = AH_DIR;
			ah1->next = list;
			list = ah1;
		      }
		    
		    /* inactivate record if not regular file */
		    if ((ah1->flags & AH_DIR) && stat(ah1->fname, &buf) != -1 && !S_ISREG(buf.st_mode))
		      ah1->flags |= AH_INACTIVE; 
		    
		  }
		closedir(dir_stream);
	      }
	  }
      }
  
  return list;
}


#ifdef HAVE_DHCP
void reread_dhcp(void)
{
  struct hostsfile *hf;

  if (daemon->dhcp_hosts_file)
    {
      struct dhcp_config *configs, *cp, **up;
  
      /* remove existing... */
      for (up = &daemon->dhcp_conf, configs = daemon->dhcp_conf; configs; configs = cp)
	{
	  cp = configs->next;
	  
	  if (configs->flags & CONFIG_BANK)
	    {
	      struct hwaddr_config *mac, *tmp;
	      struct dhcp_netid_list *list, *tmplist;
	      
	      for (mac = configs->hwaddr; mac; mac = tmp)
		{
		  tmp = mac->next;
		  free(mac);
		}

	      if (configs->flags & CONFIG_CLID)
		free(configs->clid);

	      for (list = configs->netid; list; list = tmplist)
		{
		  free(list->list);
		  tmplist = list->next;
		  free(list);
		}
	      
	      if (configs->flags & CONFIG_NAME)
		free(configs->hostname);
	      
	      *up = configs->next;
	      free(configs);
	    }
	  else
	    up = &configs->next;
	}
      
      daemon->dhcp_hosts_file = expand_filelist(daemon->dhcp_hosts_file);
      for (hf = daemon->dhcp_hosts_file; hf; hf = hf->next)
	 if (!(hf->flags & AH_INACTIVE))
	   {
	     one_file(hf->fname, LOPT_BANK);  
	     my_syslog(MS_DHCP | LOG_INFO, _("read %s"), hf->fname);
	   }
    }

  if (daemon->dhcp_opts_file)
    {
      struct dhcp_opt *opts, *cp, **up;
      struct dhcp_netid *id, *next;

      for (up = &daemon->dhcp_opts, opts = daemon->dhcp_opts; opts; opts = cp)
	{
	  cp = opts->next;
	  
	  if (opts->flags & DHOPT_BANK)
	    {
	      if ((opts->flags & DHOPT_VENDOR))
		free(opts->u.vendor_class);
	      free(opts->val);
	      for (id = opts->netid; id; id = next)
		{
		  next = id->next;
		  free(id->net);
		  free(id);
		}
	      *up = opts->next;
	      free(opts);
	    }
	  else
	    up = &opts->next;
	}
      
      daemon->dhcp_opts_file = expand_filelist(daemon->dhcp_opts_file);
      for (hf = daemon->dhcp_opts_file; hf; hf = hf->next)
	if (!(hf->flags & AH_INACTIVE))
	  {
	    one_file(hf->fname, LOPT_OPTS);  
	    my_syslog(MS_DHCP | LOG_INFO, _("read %s"), hf->fname);
	  }
    }
}
#endif
    
void read_opts(int argc, char **argv, char *compile_opts)
{
  char *buff = opt_malloc(MAXDNAME);
  int option, conffile_opt = '7', testmode = 0;
  char *errmess, *arg, *conffile = CONFFILE;
      
  opterr = 0;

  daemon = opt_malloc(sizeof(struct daemon));
  memset(daemon, 0, sizeof(struct daemon));
  daemon->namebuff = buff;

  /* Set defaults - everything else is zero or NULL */
  daemon->cachesize = CACHESIZ;
  daemon->ftabsize = FTABSIZ;
  daemon->port = NAMESERVER_PORT;
  daemon->dhcp_client_port = DHCP_CLIENT_PORT;
  daemon->dhcp_server_port = DHCP_SERVER_PORT;
  daemon->default_resolv.is_default = 1;
  daemon->default_resolv.name = RESOLVFILE;
  daemon->resolv_files = &daemon->default_resolv;
  daemon->username = CHUSER;
  daemon->runfile =  RUNFILE;
  daemon->dhcp_max = MAXLEASES;
  daemon->tftp_max = TFTP_MAX_CONNECTIONS;
  daemon->edns_pktsz = EDNS_PKTSZ;
  daemon->log_fac = -1;
  add_txt("version.bind", "dnsmasq-" VERSION );
  add_txt("authors.bind", "Simon Kelley");
  add_txt("copyright.bind", COPYRIGHT);

  while (1) 
    {
#ifdef HAVE_GETOPT_LONG
      option = getopt_long(argc, argv, OPTSTRING, opts, NULL);
#else
      option = getopt(argc, argv, OPTSTRING);
#endif
      
      if (option == -1)
	{
	  for (; optind < argc; optind++)
	    {
	      unsigned char *c = (unsigned char *)argv[optind];
	      for (; *c != 0; c++)
		if (!isspace(*c))
		  die(_("junk found in command line"), NULL, EC_BADCONF);
	    }
	  break;
	}

      /* Copy optarg so that argv doesn't get changed */
      if (optarg)
	{
	  strncpy(buff, optarg, MAXDNAME);
	  buff[MAXDNAME-1] = 0;
	  arg = buff;
	}
      else
	arg = NULL;
      
      /* command-line only stuff */
      if (option == LOPT_TEST)
	testmode = 1;
      else if (option == 'w')
	{
#ifdef HAVE_DHCP
	  if (argc == 3 && strcmp(argv[2], "dhcp") == 0)
	    display_opts();
#ifdef HAVE_DHCP6
	  else if (argc == 3 && strcmp(argv[2], "dhcp6") == 0)
	    display_opts6();
#endif
	  else
#endif
	    do_usage();

	  exit(0);
	}
      else if (option == 'v')
	{
	  printf(_("Dnsmasq version %s  %s\n"), VERSION, COPYRIGHT);
	  printf(_("Compile time options: %s\n\n"), compile_opts); 
	  printf(_("This software comes with ABSOLUTELY NO WARRANTY.\n"));
	  printf(_("Dnsmasq is free software, and you are welcome to redistribute it\n"));
	  printf(_("under the terms of the GNU General Public License, version 2 or 3.\n"));
          exit(0);
        }
      else if (option == 'C')
	{
	  conffile_opt = 0; /* file must exist */
	  conffile = opt_string_alloc(arg);
	}
      else
	{
#ifdef HAVE_GETOPT_LONG
	  errmess = one_opt(option, arg, _("try --help"), 1);
#else 
	  errmess = one_opt(option, arg, _("try -w"), 1); 
#endif  
	  if (errmess)
	    die(_("bad command line options: %s"), errmess, EC_BADCONF);
	}
    }

  if (conffile)
    one_file(conffile, conffile_opt);

  /* port might not be known when the address is parsed - fill in here */
  if (daemon->servers)
    {
      struct server *tmp;
      for (tmp = daemon->servers; tmp; tmp = tmp->next)
	if (!(tmp->flags & SERV_HAS_SOURCE))
	  {
	    if (tmp->source_addr.sa.sa_family == AF_INET)
	      tmp->source_addr.in.sin_port = htons(daemon->query_port);
#ifdef HAVE_IPV6
	    else if (tmp->source_addr.sa.sa_family == AF_INET6)
	      tmp->source_addr.in6.sin6_port = htons(daemon->query_port);
#endif 
	  } 
    }
  
  if (daemon->if_addrs)
    {  
      struct iname *tmp;
      for(tmp = daemon->if_addrs; tmp; tmp = tmp->next)
	if (tmp->addr.sa.sa_family == AF_INET)
	  tmp->addr.in.sin_port = htons(daemon->port);
#ifdef HAVE_IPV6
	else if (tmp->addr.sa.sa_family == AF_INET6)
	  tmp->addr.in6.sin6_port = htons(daemon->port);
#endif /* IPv6 */
    }
		      
  /* only one of these need be specified: the other defaults to the host-name */
  if (option_bool(OPT_LOCALMX) || daemon->mxnames || daemon->mxtarget)
    {
      struct mx_srv_record *mx;
      
      if (gethostname(buff, MAXDNAME) == -1)
	die(_("cannot get host-name: %s"), NULL, EC_MISC);
      
      for (mx = daemon->mxnames; mx; mx = mx->next)
	if (!mx->issrv && hostname_isequal(mx->name, buff))
	  break;
      
      if ((daemon->mxtarget || option_bool(OPT_LOCALMX)) && !mx)
	{
	  mx = opt_malloc(sizeof(struct mx_srv_record));
	  mx->next = daemon->mxnames;
	  mx->issrv = 0;
	  mx->target = NULL;
	  mx->name = opt_string_alloc(buff);
	  daemon->mxnames = mx;
	}
      
      if (!daemon->mxtarget)
	daemon->mxtarget = opt_string_alloc(buff);

      for (mx = daemon->mxnames; mx; mx = mx->next)
	if (!mx->issrv && !mx->target)
	  mx->target = daemon->mxtarget;
    }

  if (!option_bool(OPT_NO_RESOLV) &&
      daemon->resolv_files && 
      daemon->resolv_files->next && 
      option_bool(OPT_NO_POLL))
    die(_("only one resolv.conf file allowed in no-poll mode."), NULL, EC_BADCONF);
  
  if (option_bool(OPT_RESOLV_DOMAIN))
    {
      char *line;
      FILE *f;

      if (option_bool(OPT_NO_RESOLV) ||
	  !daemon->resolv_files || 
	  (daemon->resolv_files)->next)
	die(_("must have exactly one resolv.conf to read domain from."), NULL, EC_BADCONF);
      
      if (!(f = fopen((daemon->resolv_files)->name, "r")))
	die(_("failed to read %s: %s"), (daemon->resolv_files)->name, EC_FILE);
      
      while ((line = fgets(buff, MAXDNAME, f)))
	{
	  char *token = strtok(line, " \t\n\r");
	  
	  if (!token || strcmp(token, "search") != 0)
	    continue;
	  
	  if ((token = strtok(NULL, " \t\n\r")) &&  
	      (daemon->domain_suffix = canonicalise_opt(token)))
	    break;
	}

      fclose(f);

      if (!daemon->domain_suffix)
	die(_("no search directive found in %s"), (daemon->resolv_files)->name, EC_MISC);
    }

  if (daemon->domain_suffix)
    {
       /* add domain for any srv record without one. */
      struct mx_srv_record *srv;
      
      for (srv = daemon->mxnames; srv; srv = srv->next)
	if (srv->issrv &&
	    strchr(srv->name, '.') && 
	    strchr(srv->name, '.') == strrchr(srv->name, '.'))
	  {
	    strcpy(buff, srv->name);
	    strcat(buff, ".");
	    strcat(buff, daemon->domain_suffix);
	    free(srv->name);
	    srv->name = opt_string_alloc(buff);
	  }
    }
  else if (option_bool(OPT_DHCP_FQDN))
    die(_("there must be a default domain when --dhcp-fqdn is set"), NULL, EC_BADCONF);

  if (testmode)
    {
      fprintf(stderr, "dnsmasq: %s.\n", _("syntax check OK"));
      exit(0);
    }
}