/* dnsmasq is Copyright (c) 2000-2009 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 . */ #define COPYRIGHT "Copyright (C) 2000-2009 Simon Kelley" #ifndef NO_LARGEFILE /* Ensure we can use files >2GB (log files may grow this big) */ # define _LARGEFILE_SOURCE 1 # define _FILE_OFFSET_BITS 64 #endif /* Get linux C library versions. */ #ifdef __linux__ # ifndef __ANDROID__ # define _GNU_SOURCE # endif # include #endif /* get these before config.h for IPv6 stuff... */ #include #include #include #ifdef __APPLE__ # include # include #else # ifdef __ANDROID__ # include "nameser.h" # else # include # endif #endif /* and this. */ #include #include "config.h" #define gettext_noop(S) (S) #ifndef LOCALEDIR # define _(S) (S) #else # include # include # define _(S) gettext(S) #endif #include #include #include #if defined(HAVE_SOLARIS_NETWORK) #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__sun__) || defined (__sun) || defined (__ANDROID__) # include #else # include #endif #include #include #include #include #include #include #include #ifndef HAVE_LINUX_NETWORK # include #endif #if defined(HAVE_LINUX_NETWORK) #include /* There doesn't seem to be a universally-available userpace header for these. */ extern int capset(cap_user_header_t header, cap_user_data_t data); extern int capget(cap_user_header_t header, cap_user_data_t data); #define LINUX_CAPABILITY_VERSION_1 0x19980330 #define LINUX_CAPABILITY_VERSION_2 0x20071026 #define LINUX_CAPABILITY_VERSION_3 0x20080522 #include #elif defined(HAVE_SOLARIS_NETWORK) #include #endif /* daemon is function in the C library.... */ #define daemon dnsmasq_daemon /* Async event queue */ struct event_desc { int event, data; }; #define EVENT_RELOAD 1 #define EVENT_DUMP 2 #define EVENT_ALARM 3 #define EVENT_TERM 4 #define EVENT_CHILD 5 #define EVENT_REOPEN 6 #define EVENT_EXITED 7 #define EVENT_KILLED 8 #define EVENT_EXEC_ERR 9 #define EVENT_PIPE_ERR 10 #define EVENT_USER_ERR 11 #define EVENT_CAP_ERR 12 #define EVENT_PIDFILE 13 #define EVENT_HUSER_ERR 14 #define EVENT_GROUP_ERR 15 #define EVENT_DIE 16 #define EVENT_LOG_ERR 17 #define EVENT_FORK_ERR 18 /* Exit codes. */ #define EC_GOOD 0 #define EC_BADCONF 1 #define EC_BADNET 2 #define EC_FILE 3 #define EC_NOMEM 4 #define EC_MISC 5 #define EC_INIT_OFFSET 10 /* Min buffer size: we check after adding each record, so there must be memory for the largest packet, and the largest record so the min for DNS is PACKETSZ+MAXDNAME+RRFIXEDSZ which is < 1000. This might be increased is EDNS packet size if greater than the minimum. */ #define DNSMASQ_PACKETSZ PACKETSZ+MAXDNAME+RRFIXEDSZ #define OPT_BOGUSPRIV (1u<<0) #define OPT_FILTER (1u<<1) #define OPT_LOG (1u<<2) #define OPT_SELFMX (1u<<3) #define OPT_NO_HOSTS (1u<<4) #define OPT_NO_POLL (1u<<5) #define OPT_DEBUG (1u<<6) #define OPT_ORDER (1u<<7) #define OPT_NO_RESOLV (1u<<8) #define OPT_EXPAND (1u<<9) #define OPT_LOCALMX (1u<<10) #define OPT_NO_NEG (1u<<11) #define OPT_NODOTS_LOCAL (1u<<12) #define OPT_NOWILD (1u<<13) #define OPT_ETHERS (1u<<14) #define OPT_RESOLV_DOMAIN (1u<<15) #define OPT_NO_FORK (1u<<16) #define OPT_AUTHORITATIVE (1u<<17) #define OPT_LOCALISE (1u<<18) #define OPT_DBUS (1u<<19) #define OPT_DHCP_FQDN (1u<<20) #define OPT_NO_PING (1u<<21) #define OPT_LEASE_RO (1u<<22) #define OPT_ALL_SERVERS (1u<<23) #define OPT_RELOAD (1u<<24) #define OPT_TFTP (1u<<25) #define OPT_TFTP_SECURE (1u<<26) #define OPT_TFTP_NOBLOCK (1u<<27) #define OPT_LOG_OPTS (1u<<28) #define OPT_TFTP_APREF (1u<<29) #define OPT_NO_OVERRIDE (1u<<30) #define OPT_NO_REBIND (1u<<31) /* extra flags for my_syslog, we use a couple of facilities since they are known not to occupy the same bits as priorities, no matter how syslog.h is set up. */ #define MS_TFTP LOG_USER #define MS_DHCP LOG_DAEMON struct all_addr { union { struct in_addr addr4; #ifdef HAVE_IPV6 struct in6_addr addr6; #endif } addr; }; struct bogus_addr { struct in_addr addr; struct bogus_addr *next; }; /* dns doctor param */ struct doctor { struct in_addr in, end, out, mask; struct doctor *next; }; struct mx_srv_record { char *name, *target; int issrv, srvport, priority, weight; unsigned int offset; struct mx_srv_record *next; }; struct naptr { char *name, *replace, *regexp, *services, *flags; unsigned int order, pref; struct naptr *next; }; struct txt_record { char *name, *txt; unsigned short class, len; struct txt_record *next; }; struct ptr_record { char *name, *ptr; struct ptr_record *next; }; struct cname { char *alias, *target; struct cname *next; }; struct interface_name { char *name; /* domain name */ char *intr; /* interface name */ struct interface_name *next; }; union bigname { char name[MAXDNAME]; union bigname *next; /* freelist */ }; struct crec { struct crec *next, *prev, *hash_next; time_t ttd; /* time to die */ int uid; union { struct all_addr addr; struct { struct crec *cache; int uid; } cname; } addr; unsigned short flags; union { char sname[SMALLDNAME]; union bigname *bname; char *namep; } name; }; #define F_IMMORTAL 1 #define F_CONFIG 2 #define F_REVERSE 4 #define F_FORWARD 8 #define F_DHCP 16 #define F_NEG 32 #define F_HOSTS 64 #define F_IPV4 128 #define F_IPV6 256 #define F_BIGNAME 512 #define F_UPSTREAM 1024 #define F_SERVER 2048 #define F_NXDOMAIN 4096 #define F_QUERY 8192 #define F_CNAME 16384 #define F_NOERR 32768 /* struct sockaddr is not large enough to hold any address, and specifically not big enough to hold an IPv6 address. Blech. Roll our own. */ union mysockaddr { struct sockaddr sa; struct sockaddr_in in; #if defined(HAVE_IPV6) struct sockaddr_in6 in6; #endif }; #define SERV_FROM_RESOLV 1 /* 1 for servers from resolv, 0 for command line. */ #define SERV_NO_ADDR 2 /* no server, this domain is local only */ #define SERV_LITERAL_ADDRESS 4 /* addr is the answer, not the server */ #define SERV_HAS_DOMAIN 8 /* server for one domain only */ #define SERV_HAS_SOURCE 16 /* source address defined */ #define SERV_FOR_NODOTS 32 /* server for names with no domain part only */ #define SERV_WARNED_RECURSIVE 64 /* avoid warning spam */ #define SERV_FROM_DBUS 128 /* 1 if source is DBus */ #define SERV_MARK 256 /* for mark-and-delete */ #define SERV_TYPE (SERV_HAS_DOMAIN | SERV_FOR_NODOTS) #define SERV_COUNTED 512 /* workspace for log code */ struct serverfd { int fd; union mysockaddr source_addr; char interface[IF_NAMESIZE+1]; struct serverfd *next; uint32_t mark; }; struct randfd { int fd; unsigned short refcount, family; }; struct server { union mysockaddr addr, source_addr; char interface[IF_NAMESIZE+1]; struct serverfd *sfd; char *domain; /* set if this server only handles a domain. */ int flags, tcpfd; unsigned int queries, failed_queries; uint32_t mark; struct server *next; }; struct irec { union mysockaddr addr; struct in_addr netmask; /* only valid for IPv4 */ int dhcp_ok, mtu; struct irec *next; }; struct listener { int fd, tcpfd, family; struct irec *iface; /* only valid for non-wildcard */ struct listener *next; }; /* interface and address parms from command line. */ struct iname { char *name; union mysockaddr addr; int isloop, used; struct iname *next; }; /* resolv-file parms from command-line */ struct resolvc { struct resolvc *next; int is_default, logged; time_t mtime; char *name; }; /* adn-hosts parms from command-line */ #define AH_DIR 1 #define AH_INACTIVE 2 struct hostsfile { struct hostsfile *next; int flags; char *fname; int index; /* matches to cache entries for logging */ }; struct frec { union mysockaddr source; struct all_addr dest; struct server *sentto; /* NULL means free */ struct randfd *rfd4; #ifdef HAVE_IPV6 struct randfd *rfd6; #endif unsigned int iface; unsigned short orig_id, new_id; int fd, forwardall; unsigned int crc; time_t time; struct frec *next; }; /* actions in the daemon->helper RPC */ #define ACTION_DEL 1 #define ACTION_OLD_HOSTNAME 2 #define ACTION_OLD 3 #define ACTION_ADD 4 #define DHCP_CHADDR_MAX 16 struct dhcp_lease { int clid_len; /* length of client identifier */ unsigned char *clid; /* clientid */ char *hostname, *fqdn; /* name from client-hostname option or config */ char *old_hostname; /* hostname before it moved to another lease */ char auth_name; /* hostname came from config, not from client */ char new; /* newly created */ char changed; /* modified */ char aux_changed; /* CLID or expiry changed */ time_t expires; /* lease expiry */ #ifdef HAVE_BROKEN_RTC unsigned int length; #endif int hwaddr_len, hwaddr_type; unsigned char hwaddr[DHCP_CHADDR_MAX]; struct in_addr addr, override, giaddr; unsigned char *vendorclass, *userclass, *supplied_hostname; unsigned int vendorclass_len, userclass_len, supplied_hostname_len; int last_interface; struct dhcp_lease *next; }; struct dhcp_netid { char *net; struct dhcp_netid *next; }; struct dhcp_netid_list { struct dhcp_netid *list; struct dhcp_netid_list *next; }; struct hwaddr_config { int hwaddr_len, hwaddr_type; unsigned char hwaddr[DHCP_CHADDR_MAX]; unsigned int wildcard_mask; struct hwaddr_config *next; }; struct dhcp_config { unsigned int flags; int clid_len; /* length of client identifier */ unsigned char *clid; /* clientid */ char *hostname, *domain; struct dhcp_netid netid; struct in_addr addr; time_t decline_time; unsigned int lease_time; struct hwaddr_config *hwaddr; struct dhcp_config *next; }; #define CONFIG_DISABLE 1 #define CONFIG_CLID 2 #define CONFIG_TIME 8 #define CONFIG_NAME 16 #define CONFIG_ADDR 32 #define CONFIG_NETID 64 #define CONFIG_NOCLID 128 #define CONFIG_FROM_ETHERS 256 /* entry created by /etc/ethers */ #define CONFIG_ADDR_HOSTS 512 /* address added by from /etc/hosts */ #define CONFIG_DECLINED 1024 /* address declined by client */ #define CONFIG_BANK 2048 /* from dhcp hosts file */ struct dhcp_opt { int opt, len, flags; union { int encap; unsigned int wildcard_mask; unsigned char *vendor_class; } u; unsigned char *val; struct dhcp_netid *netid; struct dhcp_opt *next; }; #define DHOPT_ADDR 1 #define DHOPT_STRING 2 #define DHOPT_ENCAPSULATE 4 #define DHOPT_ENCAP_MATCH 8 #define DHOPT_FORCE 16 #define DHOPT_BANK 32 #define DHOPT_ENCAP_DONE 64 #define DHOPT_MATCH 128 #define DHOPT_VENDOR 256 #define DHOPT_HEX 512 #define DHOPT_VENDOR_MATCH 1024 struct dhcp_boot { char *file, *sname; struct in_addr next_server; struct dhcp_netid *netid; struct dhcp_boot *next; }; struct pxe_service { unsigned short CSA, type; char *menu, *basename; struct in_addr server; struct dhcp_netid *netid; struct pxe_service *next; }; #define MATCH_VENDOR 1 #define MATCH_USER 2 #define MATCH_CIRCUIT 3 #define MATCH_REMOTE 4 #define MATCH_SUBSCRIBER 5 /* vendorclass, userclass, remote-id or cicuit-id */ struct dhcp_vendor { int len, match_type, option; char *data; struct dhcp_netid netid; struct dhcp_vendor *next; }; struct dhcp_mac { unsigned int mask; int hwaddr_len, hwaddr_type; unsigned char hwaddr[DHCP_CHADDR_MAX]; struct dhcp_netid netid; struct dhcp_mac *next; }; struct dhcp_bridge { char iface[IF_NAMESIZE]; struct dhcp_bridge *alias, *next; }; struct cond_domain { char *domain; struct in_addr start, end; struct cond_domain *next; }; struct dhcp_context { unsigned int lease_time, addr_epoch; struct in_addr netmask, broadcast; struct in_addr local, router; struct in_addr start, end; /* range of available addresses */ int flags; struct dhcp_netid netid, *filter; struct dhcp_context *next, *current; }; #define CONTEXT_STATIC 1 #define CONTEXT_NETMASK 2 #define CONTEXT_BRDCAST 4 #define CONTEXT_PROXY 8 typedef unsigned char u8; typedef unsigned short u16; typedef unsigned int u32; struct dhcp_packet { u8 op, htype, hlen, hops; u32 xid; u16 secs, flags; struct in_addr ciaddr, yiaddr, siaddr, giaddr; u8 chaddr[DHCP_CHADDR_MAX], sname[64], file[128]; u8 options[312]; }; struct ping_result { struct in_addr addr; time_t time; struct ping_result *next; }; extern struct daemon { /* datastuctures representing the command-line and config file arguments. All set (including defaults) in option.c */ unsigned int options; struct resolvc default_resolv, *resolv_files; time_t last_resolv; struct mx_srv_record *mxnames; struct naptr *naptr; struct txt_record *txt; struct ptr_record *ptr; struct cname *cnames; struct interface_name *int_names; char *mxtarget; char *lease_file; char *username, *groupname, *scriptuser; int group_set, osport; char *domain_suffix; struct cond_domain *cond_domain; char *runfile; char *lease_change_command; struct iname *if_names, *if_addrs, *if_except, *dhcp_except; struct bogus_addr *bogus_addr; struct server *servers; int log_fac; /* log facility */ char *log_file; /* optional log file */ int max_logs; /* queue limit */ int cachesize, ftabsize; int port, query_port, min_port; unsigned long local_ttl, neg_ttl; struct hostsfile *addn_hosts; struct dhcp_context *dhcp; struct dhcp_config *dhcp_conf; struct dhcp_opt *dhcp_opts, *dhcp_match; struct dhcp_vendor *dhcp_vendors; struct dhcp_mac *dhcp_macs; struct dhcp_boot *boot_config; struct pxe_service *pxe_services; int enable_pxe; struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *force_broadcast, *bootp_dynamic; char *dhcp_hosts_file, *dhcp_opts_file; int dhcp_max; int dhcp_server_port, dhcp_client_port; unsigned int min_leasetime; struct doctor *doctors; unsigned short edns_pktsz; uint32_t listen_mark; /* globally used stuff for DNS */ char *packet; /* packet buffer */ int packet_buff_sz; /* size of above */ char *namebuff; /* MAXDNAME size buffer */ unsigned int local_answer, queries_forwarded; struct frec *frec_list; struct serverfd *sfds; struct irec *interfaces; struct listener *listeners; struct server *last_server; time_t forwardtime; int forwardcount; struct server *srv_save; /* Used for resend on DoD */ size_t packet_len; /* " " */ struct randfd *rfd_save; /* " " */ pid_t tcp_pids[MAX_PROCS]; struct randfd randomsocks[RANDOM_SOCKS]; /* DHCP state */ int dhcpfd, helperfd; #if defined(HAVE_LINUX_NETWORK) int netlinkfd; #elif defined(HAVE_BSD_NETWORK) int dhcp_raw_fd, dhcp_icmp_fd; #endif struct iovec dhcp_packet; char *dhcp_buff, *dhcp_buff2; struct ping_result *ping_results; FILE *lease_stream; struct dhcp_bridge *bridges; } *daemon; /* cache.c */ void cache_init(void); void log_query(unsigned short flags, char *name, struct all_addr *addr, char *arg); char *record_source(int index); void querystr(char *str, unsigned short type); struct crec *cache_find_by_addr(struct crec *crecp, struct all_addr *addr, time_t now, unsigned short prot); struct crec *cache_find_by_name(struct crec *crecp, char *name, time_t now, unsigned short prot); void cache_end_insert(void); void cache_start_insert(void); struct crec *cache_insert(char *name, struct all_addr *addr, time_t now, unsigned long ttl, unsigned short flags); void cache_reload(void); void cache_add_dhcp_entry(char *host_name, struct in_addr *host_address, time_t ttd); void cache_unhash_dhcp(void); void dump_cache(time_t now); char *cache_get_name(struct crec *crecp); char *get_domain(struct in_addr addr); /* rfc1035.c */ unsigned short extract_request(HEADER *header, size_t qlen, char *name, unsigned short *typep); size_t setup_reply(HEADER *header, size_t qlen, struct all_addr *addrp, unsigned short flags, unsigned long local_ttl); int extract_addresses(HEADER *header, size_t qlen, char *namebuff, time_t now); size_t answer_request(HEADER *header, char *limit, size_t qlen, struct in_addr local_addr, struct in_addr local_netmask, time_t now); int check_for_bogus_wildcard(HEADER *header, size_t qlen, char *name, struct bogus_addr *addr, time_t now); unsigned char *find_pseudoheader(HEADER *header, size_t plen, size_t *len, unsigned char **p, int *is_sign); int check_for_local_domain(char *name, time_t now); unsigned int questions_crc(HEADER *header, size_t plen, char *buff); size_t resize_packet(HEADER *header, size_t plen, unsigned char *pheader, size_t hlen); /* util.c */ void rand_init(void); unsigned short rand16(void); int legal_hostname(char *c); char *canonicalise(char *s, int *nomem); unsigned char *do_rfc1035_name(unsigned char *p, char *sval); void *safe_malloc(size_t size); void safe_pipe(int *fd, int read_noblock); void *whine_malloc(size_t size); int sa_len(union mysockaddr *addr); int sockaddr_isequal(union mysockaddr *s1, union mysockaddr *s2); int hostname_isequal(char *a, char *b); time_t dnsmasq_time(void); int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask); int retry_send(void); int parse_addr(int family, const char *addrstr, union mysockaddr *addr); void prettyprint_time(char *buf, unsigned int t); int prettyprint_addr(const union mysockaddr *addr, char *buf); int parse_hex(char *in, unsigned char *out, int maxlen, unsigned int *wildcard_mask, int *mac_type); int memcmp_masked(unsigned char *a, unsigned char *b, int len, unsigned int mask); int expand_buf(struct iovec *iov, size_t size); char *print_mac(char *buff, unsigned char *mac, int len); void bump_maxfd(int fd, int *max); int read_write(int fd, unsigned char *packet, int size, int rw); /* log.c */ void die(char *message, char *arg1, int exit_code); int log_start(struct passwd *ent_pw, int errfd); int log_reopen(char *log_file); void my_syslog(int priority, const char *format, ...); void set_log_writer(fd_set *set, int *maxfdp); void check_log_writer(fd_set *set); void flush_log(void); /* option.c */ void read_opts (int argc, char **argv, char *compile_opts); char *option_string(unsigned char opt, int *is_ip, int *is_name); void reread_dhcp(void); /* forward.c */ void reply_query(int fd, int family, time_t now); void receive_query(struct listener *listen, time_t now); unsigned char *tcp_request(int confd, time_t now, struct in_addr local_addr, struct in_addr netmask); void server_gone(struct server *server); struct frec *get_new_frec(time_t now, int *wait); /* network.c */ int indextoname(int fd, int index, char *name); int local_bind(int fd, union mysockaddr *addr, char *intname, uint32_t mark, int is_tcp); int random_sock(int family); void pre_allocate_sfds(void); int reload_servers(char *fname); #if defined(__ANDROID__) && !defined(__BRILLO__) int set_servers(const char *servers); void set_interfaces(const char *interfaces); #endif void check_servers(void); int enumerate_interfaces(); struct listener *create_wildcard_listeners(void); struct listener *create_bound_listeners(void); int iface_check(int family, struct all_addr *addr, char *name, int *indexp); int fix_fd(int fd); struct in_addr get_ifaddr(char *intr); /* dhcp.c */ #ifdef HAVE_DHCP void dhcp_init(void); void dhcp_packet(time_t now); struct dhcp_context *address_available(struct dhcp_context *context, struct in_addr addr, struct dhcp_netid *netids); struct dhcp_context *narrow_context(struct dhcp_context *context, struct in_addr taddr, struct dhcp_netid *netids); int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly);int address_allocate(struct dhcp_context *context, struct in_addr *addrp, unsigned char *hwaddr, int hw_len, struct dhcp_netid *netids, time_t now); int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type); struct dhcp_config *find_config(struct dhcp_config *configs, struct dhcp_context *context, unsigned char *clid, int clid_len, unsigned char *hwaddr, int hw_len, int hw_type, char *hostname); void dhcp_update_configs(struct dhcp_config *configs); void dhcp_read_ethers(void); void check_dhcp_hosts(int fatal); struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr); char *strip_hostname(char *hostname); char *host_from_dns(struct in_addr addr); char *get_domain(struct in_addr addr); #endif /* lease.c */ #ifdef HAVE_DHCP void lease_update_file(time_t now); void lease_update_dns(); void lease_init(time_t now); struct dhcp_lease *lease_allocate(struct in_addr addr); void lease_set_hwaddr(struct dhcp_lease *lease, unsigned char *hwaddr, unsigned char *clid, int hw_len, int hw_type, int clid_len); void lease_set_hostname(struct dhcp_lease *lease, char *name, int auth); void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now); void lease_set_interface(struct dhcp_lease *lease, int interface); struct dhcp_lease *lease_find_by_client(unsigned char *hwaddr, int hw_len, int hw_type, unsigned char *clid, int clid_len); struct dhcp_lease *lease_find_by_addr(struct in_addr addr); void lease_prune(struct dhcp_lease *target, time_t now); void lease_update_from_configs(void); int do_script_run(time_t now); void rerun_scripts(void); #endif /* rfc2131.c */ #ifdef HAVE_DHCP size_t dhcp_reply(struct dhcp_context *context, char *iface_name, int int_index, size_t sz, time_t now, int unicast_dest, int *is_inform); unsigned char *extended_hwaddr(int hwtype, int hwlen, unsigned char *hwaddr, int clid_len, unsigned char *clid, int *len_out); #endif /* dnsmasq.c */ #ifdef HAVE_DHCP int make_icmp_sock(void); int icmp_ping(struct in_addr addr); #endif void send_event(int fd, int event, int data); void clear_cache_and_reload(time_t now); /* netlink.c */ #ifdef HAVE_LINUX_NETWORK void netlink_init(void); void netlink_multicast(void); #endif /* bpf.c */ #ifdef HAVE_BSD_NETWORK void init_bpf(void); void send_via_bpf(struct dhcp_packet *mess, size_t len, struct in_addr iface_addr, struct ifreq *ifr); #endif /* bpf.c or netlink.c */ int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)()); /* helper.c */ #if defined(HAVE_DHCP) && !defined(NO_FORK) int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd); void helper_write(void); void queue_script(int action, struct dhcp_lease *lease, char *hostname, time_t now); int helper_buf_empty(void); #endif