/* dnsmasq is Copyright (c) 2000-2015 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) 2000-2015 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 and define _GNU_SOURCE for kFreeBSD. */ #if defined(__linux__) || defined(__GLIBC__) # ifndef __ANDROID__ # define _GNU_SOURCE # endif # include #endif /* Need these defined early */ #if defined(__sun) || defined(__sun__) # define _XPG4_2 # define __EXTENSIONS__ #endif /* get these before config.h for IPv6 stuff... */ #include #include #ifdef __APPLE__ /* Define before netinet/in.h to select API. OSX Lion onwards. */ # define __APPLE_USE_RFC_3542 #endif #include /* Also needed before config.h. */ #include #include "config.h" #include "ip6addr.h" typedef unsigned char u8; typedef unsigned short u16; typedef unsigned int u32; typedef unsigned long long u64; #define countof(x) (long)(sizeof(x) / sizeof(x[0])) #define MIN(a,b) ((a) < (b) ? (a) : (b)) #include "dns-protocol.h" #include "dhcp-protocol.h" #ifdef HAVE_DHCP6 #include "dhcp6-protocol.h" #include "radv-protocol.h" #endif #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 #if defined(HAVE_SOLARIS_NETWORK) && !defined(ifr_mtu) /* Some solaris net/if./h omit this. */ # define ifr_mtu ifr_ifru.ifru_metric #endif #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 #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, msg_sz; }; #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 #define EVENT_LUA_ERR 19 #define EVENT_TFTP_ERR 20 #define EVENT_INIT 21 #define EVENT_NEWADDR 22 #define EVENT_NEWROUTE 23 #define EVENT_TIME_ERR 24 /* 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 /* Trust the compiler dead-code eliminator.... */ #define option_bool(x) (((x) < 32) ? daemon->options & (1u << (x)) : daemon->options2 & (1u << ((x) - 32))) #define OPT_BOGUSPRIV 0 #define OPT_FILTER 1 #define OPT_LOG 2 #define OPT_SELFMX 3 #define OPT_NO_HOSTS 4 #define OPT_NO_POLL 5 #define OPT_DEBUG 6 #define OPT_ORDER 7 #define OPT_NO_RESOLV 8 #define OPT_EXPAND 9 #define OPT_LOCALMX 10 #define OPT_NO_NEG 11 #define OPT_NODOTS_LOCAL 12 #define OPT_NOWILD 13 #define OPT_ETHERS 14 #define OPT_RESOLV_DOMAIN 15 #define OPT_NO_FORK 16 #define OPT_AUTHORITATIVE 17 #define OPT_LOCALISE 18 #define OPT_DBUS 19 #define OPT_DHCP_FQDN 20 #define OPT_NO_PING 21 #define OPT_LEASE_RO 22 #define OPT_ALL_SERVERS 23 #define OPT_RELOAD 24 #define OPT_LOCAL_REBIND 25 #define OPT_TFTP_SECURE 26 #define OPT_TFTP_NOBLOCK 27 #define OPT_LOG_OPTS 28 #define OPT_TFTP_APREF 29 #define OPT_NO_OVERRIDE 30 #define OPT_NO_REBIND 31 #define OPT_ADD_MAC 32 #define OPT_DNSSEC_PROXY 33 #define OPT_CONSEC_ADDR 34 #define OPT_CONNTRACK 35 #define OPT_FQDN_UPDATE 36 #define OPT_RA 37 #define OPT_TFTP_LC 38 #define OPT_CLEVERBIND 39 #define OPT_TFTP 40 #define OPT_CLIENT_SUBNET 41 #define OPT_QUIET_DHCP 42 #define OPT_QUIET_DHCP6 43 #define OPT_QUIET_RA 44 #define OPT_DNSSEC_VALID 45 #define OPT_DNSSEC_TIME 46 #define OPT_DNSSEC_DEBUG 47 #define OPT_DNSSEC_NO_SIGN 48 #define OPT_LOCAL_SERVICE 49 #define OPT_LOOP_DETECT 50 #define OPT_EXTRALOG 51 #define OPT_TFTP_NO_FAIL 52 #define OPT_LAST 53 /* 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 /* for log_query */ unsigned int keytag; /* for cache_insert if RRSIG, DNSKEY, DS */ struct { unsigned short class, type; } dnssec; } 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; }; #define TXT_STAT_CACHESIZE 1 #define TXT_STAT_INSERTS 2 #define TXT_STAT_EVICTIONS 3 #define TXT_STAT_MISSES 4 #define TXT_STAT_HITS 5 #define TXT_STAT_AUTH 6 #define TXT_STAT_SERVERS 7 struct txt_record { char *name; unsigned char *txt; unsigned short class, len; int stat; struct txt_record *next; }; struct ptr_record { char *name, *ptr; struct ptr_record *next; }; struct cname { char *alias, *target; struct cname *next; }; struct ds_config { char *name, *digest; int digestlen, class, algo, keytag, digest_type; struct ds_config *next; }; #define ADDRLIST_LITERAL 1 #define ADDRLIST_IPV6 2 #define ADDRLIST_REVONLY 4 struct addrlist { struct all_addr addr; int flags, prefixlen; struct addrlist *next; }; #define AUTH6 1 #define AUTH4 2 struct auth_zone { char *domain; struct auth_name_list { char *name; int flags; struct auth_name_list *next; } *interface_names; struct addrlist *subnet; struct auth_zone *next; }; struct host_record { struct name_list { char *name; struct name_list *next; } *names; struct in_addr addr; #ifdef HAVE_IPV6 struct in6_addr addr6; #endif struct host_record *next; }; struct interface_name { char *name; /* domain name */ char *intr; /* interface name */ int family; /* AF_INET, AF_INET6 or zero for both */ struct addrlist *addr; struct interface_name *next; }; union bigname { char name[MAXDNAME]; union bigname *next; /* freelist */ }; struct blockdata { struct blockdata *next; unsigned char key[KEYBLOCK_LEN]; }; struct crec { struct crec *next, *prev, *hash_next; /* union is 16 bytes when doing IPv6, 8 bytes on 32 bit machines without IPv6 */ union { struct all_addr addr; struct { union { struct crec *cache; struct interface_name *int_name; } target; unsigned int uid; /* 0 if union is interface-name */ } cname; struct { struct blockdata *keydata; unsigned short keylen, flags, keytag; unsigned char algo; } key; struct { struct blockdata *keydata; unsigned short keylen, keytag; unsigned char algo; unsigned char digest; } ds; struct { struct blockdata *keydata; unsigned short keylen, type_covered, keytag; char algo; } sig; } addr; time_t ttd; /* time to die */ /* used as class if DNSKEY/DS/RRSIG, index to source for F_HOSTS */ unsigned int uid; unsigned short flags; union { char sname[SMALLDNAME]; union bigname *bname; char *namep; } name; }; #define F_IMMORTAL (1u<<0) #define F_NAMEP (1u<<1) #define F_REVERSE (1u<<2) #define F_FORWARD (1u<<3) #define F_DHCP (1u<<4) #define F_NEG (1u<<5) #define F_HOSTS (1u<<6) #define F_IPV4 (1u<<7) #define F_IPV6 (1u<<8) #define F_BIGNAME (1u<<9) #define F_NXDOMAIN (1u<<10) #define F_CNAME (1u<<11) #define F_DNSKEY (1u<<12) #define F_CONFIG (1u<<13) #define F_DS (1u<<14) #define F_DNSSECOK (1u<<15) /* below here are only valid as args to log_query: cache entries are limited to 16 bits */ #define F_UPSTREAM (1u<<16) #define F_RRNAME (1u<<17) #define F_SERVER (1u<<18) #define F_QUERY (1u<<19) #define F_NOERR (1u<<20) #define F_AUTH (1u<<21) #define F_DNSSEC (1u<<22) #define F_KEYTAG (1u<<23) #define F_SECSTAT (1u<<24) #define F_NO_RR (1u<<25) #define F_IPSET (1u<<26) #define F_NSIGMATCH (1u<<27) #define F_NOEXTRA (1u<<28) /* Values of uid in crecs with F_CONFIG bit set. */ #define SRC_INTERFACE 0 #define SRC_CONFIG 1 #define SRC_HOSTS 2 #define SRC_AH 3 /* 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 }; /* bits in flag param to IPv6 callbacks from iface_enumerate() */ #define IFACE_TENTATIVE 1 #define IFACE_DEPRECATED 2 #define IFACE_PERMANENT 4 #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 */ #define SERV_USE_RESOLV 1024 /* forward this domain in the normal way */ #define SERV_NO_REBIND 2048 /* inhibit dns-rebind protection */ #define SERV_FROM_FILE 4096 /* read from --servers-file */ #define SERV_LOOP 8192 /* server causes forwarding loop */ struct serverfd { int fd; union mysockaddr source_addr; char interface[IF_NAMESIZE+1]; struct serverfd *next; }; 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, edns_pktsz; unsigned int queries, failed_queries; #ifdef HAVE_LOOP u32 uid; #endif struct server *next; }; struct ipsets { char **sets; char *domain; struct ipsets *next; }; struct irec { union mysockaddr addr; struct in_addr netmask; /* only valid for IPv4 */ int tftp_ok, dhcp_ok, mtu, done, warned, dad, dns_auth, index, multicast_done, found; char *name; struct irec *next; }; struct listener { int fd, tcpfd, tftpfd, family; struct irec *iface; /* only sometimes valid for non-wildcard */ struct listener *next; }; /* interface and address parms from command line. */ struct iname { char *name; union mysockaddr addr; int used; struct iname *next; }; /* resolv-file parms from command-line */ struct resolvc { struct resolvc *next; int is_default, logged; time_t mtime; char *name; #ifdef HAVE_INOTIFY int wd; /* inotify watch descriptor */ char *file; /* pointer to file part if path */ #endif }; /* adn-hosts parms from command-line (also dhcp-hostsfile and dhcp-optsfile and dhcp-hostsdir*/ #define AH_DIR 1 #define AH_INACTIVE 2 #define AH_WD_DONE 4 #define AH_HOSTS 8 #define AH_DHCP_HST 16 #define AH_DHCP_OPT 32 struct hostsfile { struct hostsfile *next; int flags; char *fname; #ifdef HAVE_INOTIFY int wd; /* inotify watch descriptor */ #endif unsigned int index; /* matches to cache entries for logging */ }; /* DNSSEC status values. */ #define STAT_SECURE 1 #define STAT_INSECURE 2 #define STAT_BOGUS 3 #define STAT_NEED_DS 4 #define STAT_NEED_KEY 5 #define STAT_TRUNCATED 6 #define STAT_SECURE_WILDCARD 7 #define STAT_NO_SIG 8 #define STAT_NO_DS 9 #define STAT_NO_NS 10 #define STAT_NEED_DS_NEG 11 #define STAT_CHASE_CNAME 12 #define STAT_INSECURE_DS 13 #define FREC_NOREBIND 1 #define FREC_CHECKING_DISABLED 2 #define FREC_HAS_SUBNET 4 #define FREC_DNSKEY_QUERY 8 #define FREC_DS_QUERY 16 #define FREC_AD_QUESTION 32 #define FREC_DO_QUESTION 64 #define FREC_ADDED_PHEADER 128 #define FREC_CHECK_NOSIGN 256 #define FREC_TEST_PKTSZ 512 #ifdef HAVE_DNSSEC #define HASH_SIZE 20 /* SHA-1 digest size */ #else #define HASH_SIZE sizeof(int) #endif 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 log_id, fd, forwardall, flags; time_t time; unsigned char *hash[HASH_SIZE]; #ifdef HAVE_DNSSEC int class, work_counter; struct blockdata *stash; /* Saved reply, whilst we validate */ struct blockdata *orig_domain; /* domain of original query, whilst we're seeing is if in unsigned domain */ size_t stash_len, name_start, name_len; struct frec *dependent; /* Query awaiting internally-generated DNSKEY or DS query */ struct frec *blocking_query; /* Query which is blocking us. */ #endif struct frec *next; }; /* flags in top of length field for DHCP-option tables */ #define OT_ADDR_LIST 0x8000 #define OT_RFC1035_NAME 0x4000 #define OT_INTERNAL 0x2000 #define OT_NAME 0x1000 #define OT_CSTRING 0x0800 #define OT_DEC 0x0400 #define OT_TIME 0x0200 /* actions in the daemon->helper RPC */ #define ACTION_DEL 1 #define ACTION_OLD_HOSTNAME 2 #define ACTION_OLD 3 #define ACTION_ADD 4 #define ACTION_TFTP 5 #define LEASE_NEW 1 /* newly created */ #define LEASE_CHANGED 2 /* modified */ #define LEASE_AUX_CHANGED 4 /* CLID or expiry changed */ #define LEASE_AUTH_NAME 8 /* hostname came from config, not from client */ #define LEASE_USED 16 /* used this DHCPv6 transaction */ #define LEASE_NA 32 /* IPv6 no-temporary lease */ #define LEASE_TA 64 /* IPv6 temporary lease */ #define LEASE_HAVE_HWADDR 128 /* Have set hwaddress */ 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 */ int flags; 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 *extradata; unsigned int extradata_len, extradata_size; int last_interface; int new_interface; /* save possible originated interface */ int new_prefixlen; /* and its prefix length */ #ifdef HAVE_DHCP6 struct in6_addr addr6; int iaid; struct slaac_address { struct in6_addr addr; time_t ping_time; int backoff; /* zero -> confirmed */ struct slaac_address *next; } *slaac_address; int vendorclass_count; #endif 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 tag_if { struct dhcp_netid_list *set; struct dhcp_netid *tag; struct tag_if *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_list *netid; #ifdef HAVE_DHCP6 struct in6_addr addr6; #endif struct in_addr addr; time_t decline_time; unsigned int lease_time; struct hwaddr_config *hwaddr; struct dhcp_config *next; }; #define have_config(config, mask) ((config) && ((config)->flags & (mask))) #define CONFIG_DISABLE 1 #define CONFIG_CLID 2 #define CONFIG_TIME 8 #define CONFIG_NAME 16 #define CONFIG_ADDR 32 #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 */ #define CONFIG_ADDR6 4096 #define CONFIG_WILDCARD 8192 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 #define DHOPT_RFC3925 2048 #define DHOPT_TAGOK 4096 #define DHOPT_ADDR6 8192 struct dhcp_boot { char *file, *sname, *tftp_sname; struct in_addr next_server; struct dhcp_netid *netid; struct dhcp_boot *next; }; struct pxe_service { unsigned short CSA, type; char *menu, *basename, *sname; 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; unsigned int enterprise; 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, *prefix; struct in_addr start, end; #ifdef HAVE_IPV6 struct in6_addr start6, end6; #endif int is6; struct cond_domain *next; }; #ifdef OPTION6_PREFIX_CLASS struct prefix_class { int class; struct dhcp_netid tag; struct prefix_class *next; }; #endif struct ra_interface { char *name; int interval, lifetime, prio; struct ra_interface *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 */ #ifdef HAVE_DHCP6 struct in6_addr start6, end6; /* range of available addresses */ struct in6_addr local6; int prefix, if_index; unsigned int valid, preferred, saved_valid; time_t ra_time, ra_short_period_start, address_lost_time; char *template_interface; #endif int flags; struct dhcp_netid netid, *filter; struct dhcp_context *next, *current; }; #define CONTEXT_STATIC (1u<<0) #define CONTEXT_NETMASK (1u<<1) #define CONTEXT_BRDCAST (1u<<2) #define CONTEXT_PROXY (1u<<3) #define CONTEXT_RA_ROUTER (1u<<4) #define CONTEXT_RA_DONE (1u<<5) #define CONTEXT_RA_NAME (1u<<6) #define CONTEXT_RA_STATELESS (1u<<7) #define CONTEXT_DHCP (1u<<8) #define CONTEXT_DEPRECATE (1u<<9) #define CONTEXT_TEMPLATE (1u<<10) /* create contexts using addresses */ #define CONTEXT_CONSTRUCTED (1u<<11) #define CONTEXT_GC (1u<<12) #define CONTEXT_RA (1u<<13) #define CONTEXT_CONF_USED (1u<<14) #define CONTEXT_USED (1u<<15) #define CONTEXT_OLD (1u<<16) #define CONTEXT_V6 (1u<<17) #define CONTEXT_RA_OFF_LINK (1u<<18) struct ping_result { struct in_addr addr; time_t time; unsigned int hash; struct ping_result *next; }; struct tftp_file { int refcount, fd; off_t size; dev_t dev; ino_t inode; char filename[]; }; struct tftp_transfer { int sockfd; time_t timeout; int backoff; unsigned int block, blocksize, expansion; off_t offset; union mysockaddr peer; char opt_blocksize, opt_transize, netascii, carrylf; struct tftp_file *file; struct tftp_transfer *next; }; struct addr_list { struct in_addr addr; struct addr_list *next; }; struct tftp_prefix { char *interface; char *prefix; int missing; struct tftp_prefix *next; }; struct dhcp_relay { struct all_addr local, server; char *interface; /* Allowable interface for replies from server, and dest for IPv6 multicast */ int iface_index; /* working - interface in which requests arrived, for return */ struct dhcp_relay *current, *next; }; extern struct daemon { /* datastuctures representing the command-line and config file arguments. All set (including defaults) in option.c */ unsigned int options, options2; struct resolvc default_resolv, *resolv_files; time_t last_resolv; char *servers_file; struct mx_srv_record *mxnames; struct naptr *naptr; struct txt_record *txt, *rr; struct ptr_record *ptr; struct host_record *host_records, *host_records_tail; struct cname *cnames; struct auth_zone *auth_zones; struct interface_name *int_names; char *mxtarget; int addr4_netmask; int addr6_netmask; char *lease_file; char *username, *groupname, *scriptuser; char *luascript; char *authserver, *hostmaster; struct iname *authinterface; struct name_list *secondary_forward_server; int group_set, osport; char *domain_suffix; struct cond_domain *cond_domain, *synth_domains; char *runfile; char *lease_change_command; struct iname *if_names, *if_addrs, *if_except, *dhcp_except, *auth_peers, *tftp_interfaces; struct bogus_addr *bogus_addr, *ignore_addr; struct server *servers; struct ipsets *ipsets; 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, max_ttl, min_cache_ttl, max_cache_ttl, auth_ttl; struct hostsfile *addn_hosts; struct dhcp_context *dhcp, *dhcp6; struct ra_interface *ra_interfaces; struct dhcp_config *dhcp_conf; struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6; struct dhcp_vendor *dhcp_vendors; struct dhcp_mac *dhcp_macs; struct dhcp_boot *boot_config; struct pxe_service *pxe_services; struct tag_if *tag_if; struct addr_list *override_relays; struct dhcp_relay *relay4, *relay6; int override; int enable_pxe; int doing_ra, doing_dhcp6; struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names; struct dhcp_netid_list *force_broadcast, *bootp_dynamic; struct hostsfile *dhcp_hosts_file, *dhcp_opts_file, *dynamic_dirs; int dhcp_max, tftp_max; int dhcp_server_port, dhcp_client_port; int start_tftp_port, end_tftp_port; unsigned int min_leasetime; struct doctor *doctors; unsigned short edns_pktsz; char *tftp_prefix; struct tftp_prefix *if_prefix; /* per-interface TFTP prefixes */ unsigned int duid_enterprise, duid_config_len; unsigned char *duid_config; char *dbus_name; unsigned long soa_sn, soa_refresh, soa_retry, soa_expiry; #ifdef OPTION6_PREFIX_CLASS struct prefix_class *prefix_classes; #endif #ifdef HAVE_DNSSEC struct ds_config *ds; int back_to_the_future; char *timestamp_file; #endif /* globally used stuff for DNS */ char *packet; /* packet buffer */ int packet_buff_sz; /* size of above */ char *namebuff; /* MAXDNAME size buffer */ #ifdef HAVE_DNSSEC char *keyname; /* MAXDNAME size buffer */ char *workspacename; /* ditto */ #endif unsigned int local_answer, queries_forwarded, auth_answer; 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]; int v6pktinfo; struct addrlist *interface_addrs; /* list of all addresses/prefix lengths associated with all local interfaces */ int log_id, log_display_id; /* ids of transactions for logging */ union mysockaddr *log_source_addr; /* DHCP state */ int dhcpfd, helperfd, pxefd; #ifdef HAVE_INOTIFY int inotifyfd; #endif #if defined(HAVE_LINUX_NETWORK) int netlinkfd; #elif defined(HAVE_BSD_NETWORK) int dhcp_raw_fd, dhcp_icmp_fd, routefd; #endif struct iovec dhcp_packet; char *dhcp_buff, *dhcp_buff2, *dhcp_buff3; struct ping_result *ping_results; FILE *lease_stream; struct dhcp_bridge *bridges; #ifdef HAVE_DHCP6 int duid_len; unsigned char *duid; struct iovec outpacket; int dhcp6fd, icmp6fd; #endif /* DBus stuff */ /* void * here to avoid depending on dbus headers outside dbus.c */ void *dbus; #ifdef HAVE_DBUS struct watch *watches; #endif /* TFTP stuff */ struct tftp_transfer *tftp_trans, *tftp_done_trans; /* utility string buffer, hold max sized IP address as string */ char *addrbuff; char *addrbuff2; /* only allocated when OPT_EXTRALOG */ } *daemon; /* cache.c */ void cache_init(void); void log_query(unsigned int flags, char *name, struct all_addr *addr, char *arg); char *record_source(unsigned int index); char *querystr(char *desc, unsigned short type); struct crec *cache_find_by_addr(struct crec *crecp, struct all_addr *addr, time_t now, unsigned int prot); struct crec *cache_find_by_name(struct crec *crecp, char *name, time_t now, unsigned int 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, int prot, struct all_addr *host_address, time_t ttd); struct in_addr a_record_from_hosts(char *name, time_t now); void cache_unhash_dhcp(void); void dump_cache(time_t now); int cache_make_stat(struct txt_record *t); char *cache_get_name(struct crec *crecp); char *cache_get_cname_target(struct crec *crecp); struct crec *cache_enumerate(int init); int read_hostsfile(char *filename, unsigned int index, int cache_size, struct crec **rhash, int hashsz); /* blockdata.c */ #ifdef HAVE_DNSSEC void blockdata_init(void); void blockdata_report(void); struct blockdata *blockdata_alloc(char *data, size_t len); void *blockdata_retrieve(struct blockdata *block, size_t len, void *data); void blockdata_free(struct blockdata *blocks); #endif /* domain.c */ char *get_domain(struct in_addr addr); #ifdef HAVE_IPV6 char *get_domain6(struct in6_addr *addr); #endif int is_name_synthetic(int flags, char *name, struct all_addr *addr); int is_rev_synth(int flag, struct all_addr *addr, char *name); /* rfc1035.c */ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp, char *name, int isExtract, int extrabytes); unsigned char *skip_name(unsigned char *ansp, struct dns_header *header, size_t plen, int extrabytes); unsigned char *skip_questions(struct dns_header *header, size_t plen); unsigned char *skip_section(unsigned char *ansp, int count, struct dns_header *header, size_t plen); unsigned int extract_request(struct dns_header *header, size_t qlen, char *name, unsigned short *typep); size_t setup_reply(struct dns_header *header, size_t qlen, struct all_addr *addrp, unsigned int flags, unsigned long local_ttl); int extract_addresses(struct dns_header *header, size_t qlen, char *namebuff, time_t now, char **ipsets, int is_sign, int checkrebind, int no_cache, int secure, int *doctored); size_t answer_request(struct dns_header *header, char *limit, size_t qlen, struct in_addr local_addr, struct in_addr local_netmask, time_t now, int *ad_reqd, int *do_bit); int check_for_bogus_wildcard(struct dns_header *header, size_t qlen, char *name, struct bogus_addr *addr, time_t now); int check_for_ignored_address(struct dns_header *header, size_t qlen, struct bogus_addr *baddr); unsigned char *find_pseudoheader(struct dns_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(struct dns_header *header, size_t plen, char *buff); size_t resize_packet(struct dns_header *header, size_t plen, unsigned char *pheader, size_t hlen); size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3); size_t add_source_addr(struct dns_header *header, size_t plen, char *limit, union mysockaddr *source); #ifdef HAVE_DNSSEC size_t add_do_bit(struct dns_header *header, size_t plen, char *limit); #endif int check_source(struct dns_header *header, size_t plen, unsigned char *pseudoheader, union mysockaddr *peer); int add_resource_record(struct dns_header *header, char *limit, int *truncp, int nameoffset, unsigned char **pp, unsigned long ttl, int *offset, unsigned short type, unsigned short class, char *format, ...); unsigned char *skip_questions(struct dns_header *header, size_t plen); int extract_name(struct dns_header *header, size_t plen, unsigned char **pp, char *name, int isExtract, int extrabytes); int in_arpa_name_2_addr(char *namein, struct all_addr *addrp); int private_net(struct in_addr addr, int ban_localhost); /* auth.c */ #ifdef HAVE_AUTH size_t answer_auth(struct dns_header *header, char *limit, size_t qlen, time_t now, union mysockaddr *peer_addr, int local_query); int in_zone(struct auth_zone *zone, char *name, char **cut); #endif /* dnssec.c */ size_t dnssec_generate_query(struct dns_header *header, char *end, char *name, int class, int type, union mysockaddr *addr, int edns_pktsz); int dnssec_validate_by_ds(time_t now, struct dns_header *header, size_t n, char *name, char *keyname, int class); int dnssec_validate_ds(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname, int class); int dnssec_validate_reply(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname, int *class, int *neganswer, int *nons); int dnssec_chase_cname(time_t now, struct dns_header *header, size_t plen, char *name, char *keyname); int dnskey_keytag(int alg, int flags, unsigned char *rdata, int rdlen); size_t filter_rrsigs(struct dns_header *header, size_t plen); unsigned char* hash_questions(struct dns_header *header, size_t plen, char *name); int setup_timestamp(void); /* util.c */ void rand_init(void); unsigned short rand16(void); u32 rand32(void); u64 rand64(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(const char *a, const char *b); time_t dnsmasq_time(void); int netmask_length(struct in_addr mask); int is_same_net(struct in_addr a, struct in_addr b, struct in_addr mask); #ifdef HAVE_IPV6 int is_same_net6(struct in6_addr *a, struct in6_addr *b, int prefixlen); u64 addr6part(struct in6_addr *addr); void setaddr6part(struct in6_addr *addr, u64 host); #endif int retry_send(ssize_t rc); void prettyprint_time(char *buf, unsigned int t); int prettyprint_addr(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); int read_write(int fd, unsigned char *packet, int size, int rw); int wildcard_match(const char* wildcard, const char* match); int wildcard_matchn(const char* wildcard, const char* match, int num); /* 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(void); void check_log_writer(int force); void flush_log(void); /* option.c */ void read_opts (int argc, char **argv, char *compile_opts); char *option_string(int prot, unsigned int opt, unsigned char *val, int opt_len, char *buf, int buf_len); void reread_dhcp(void); void read_servers_file(void); void set_option_bool(unsigned int opt); void reset_option_bool(unsigned int opt); struct hostsfile *expand_filelist(struct hostsfile *list); char *parse_server(char *arg, union mysockaddr *addr, union mysockaddr *source_addr, char *interface, int *flags); int option_read_dynfile(char *file, int flags); /* 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, union mysockaddr *local_addr, struct in_addr netmask, int auth_dns); void server_gone(struct server *server); struct frec *get_new_frec(time_t now, int *wait, int force); int send_from(int fd, int nowild, char *packet, size_t len, union mysockaddr *to, struct all_addr *source, unsigned int iface); void resend_query(); struct randfd *allocate_rfd(int family); void free_rfd(struct randfd *rfd); /* network.c */ int indextoname(int fd, int index, char *name); int local_bind(int fd, union mysockaddr *addr, char *intname, int is_tcp); int random_sock(int family); void pre_allocate_sfds(void); int reload_servers(char *fname); void mark_servers(int flag); void cleanup_servers(void); void add_update_server(int flags, union mysockaddr *addr, union mysockaddr *source_addr, const char *interface, const char *domain); void check_servers(void); int enumerate_interfaces(int reset); void create_wildcard_listeners(void); void create_bound_listeners(int die); void warn_bound_listeners(void); void warn_int_names(void); int is_dad_listeners(void); int iface_check(int family, struct all_addr *addr, char *name, int *auth_dns); int loopback_exception(int fd, int family, struct all_addr *addr, char *name); int label_exception(int index, int family, struct all_addr *addr); int fix_fd(int fd); int tcp_interface(int fd, int af); #ifdef HAVE_IPV6 int set_ipv6pktinfo(int fd); #endif #ifdef HAVE_DHCP6 void join_multicast(int dienow); #endif #if defined(HAVE_LINUX_NETWORK) || defined(HAVE_BSD_NETWORK) void newaddress(time_t now); #endif /* dhcp.c */ #ifdef HAVE_DHCP void dhcp_init(void); void dhcp_packet(time_t now, int pxe_fd); 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 address_allocate(struct dhcp_context *context, struct in_addr *addrp, unsigned char *hwaddr, int hw_len, struct dhcp_netid *netids, time_t now); void dhcp_read_ethers(void); struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr); char *host_from_dns(struct in_addr addr); #endif /* lease.c */ #ifdef HAVE_DHCP void lease_update_file(time_t now); void lease_update_dns(int force); void lease_init(time_t now); struct dhcp_lease *lease4_allocate(struct in_addr addr); #ifdef HAVE_DHCP6 struct dhcp_lease *lease6_allocate(struct in6_addr *addrp, int lease_type); struct dhcp_lease *lease6_find(unsigned char *clid, int clid_len, int lease_type, int iaid, struct in6_addr *addr); void lease6_reset(void); struct dhcp_lease *lease6_find_by_client(struct dhcp_lease *first, int lease_type, unsigned char *clid, int clid_len, int iaid); struct dhcp_lease *lease6_find_by_addr(struct in6_addr *net, int prefix, u64 addr); u64 lease_find_max_addr6(struct dhcp_context *context); void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface); void lease_update_slaac(time_t now); void lease_set_iaid(struct dhcp_lease *lease, int iaid); void lease_make_duid(time_t now); #endif void lease_set_hwaddr(struct dhcp_lease *lease, const unsigned char *hwaddr, const unsigned char *clid, int hw_len, int hw_type, int clid_len, time_t now, int force); void lease_set_hostname(struct dhcp_lease *lease, const char *name, int auth, char *domain, char *config_domain); void lease_set_expires(struct dhcp_lease *lease, unsigned int len, time_t now); void lease_set_interface(struct dhcp_lease *lease, int interface, time_t now); 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); struct in_addr lease_find_max_addr(struct dhcp_context *context); 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); void lease_find_interfaces(time_t now); #ifdef HAVE_SCRIPT void lease_add_extradata(struct dhcp_lease *lease, unsigned char *data, unsigned int len, int delim); #endif #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, int pxe_fd, struct in_addr fallback); 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 queue_event(int event); void send_alarm(time_t event, time_t now); void send_event(int fd, int event, int data, char *msg); 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); void route_init(void); void route_sock(void); #endif /* bpf.c or netlink.c */ int iface_enumerate(int family, void *parm, int (callback)()); /* dbus.c */ #ifdef HAVE_DBUS char *dbus_init(void); void check_dbus_listeners(void); void set_dbus_listeners(void); # ifdef HAVE_DHCP void emit_dbus_signal(int action, struct dhcp_lease *lease, char *hostname); # endif #endif /* ipset.c */ #ifdef HAVE_IPSET void ipset_init(void); int add_to_ipset(const char *setname, const struct all_addr *ipaddr, int flags, int remove); #endif /* helper.c */ #if defined(HAVE_SCRIPT) 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); #ifdef HAVE_TFTP void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer); #endif int helper_buf_empty(void); #endif /* tftp.c */ #ifdef HAVE_TFTP void tftp_request(struct listener *listen, time_t now); void check_tftp_listeners(time_t now); int do_tftp_script_run(void); #endif /* conntrack.c */ #ifdef HAVE_CONNTRACK int get_incoming_mark(union mysockaddr *peer_addr, struct all_addr *local_addr, int istcp, unsigned int *markp); #endif /* dhcp6.c */ #ifdef HAVE_DHCP6 void dhcp6_init(void); void dhcp6_packet(time_t now); struct dhcp_context *address6_allocate(struct dhcp_context *context, unsigned char *clid, int clid_len, int temp_addr, int iaid, int serial, struct dhcp_netid *netids, int plain_range, struct in6_addr *ans); int config_valid(struct dhcp_config *config, struct dhcp_context *context, struct in6_addr *addr); struct dhcp_context *address6_available(struct dhcp_context *context, struct in6_addr *taddr, struct dhcp_netid *netids, int plain_range); struct dhcp_context *address6_valid(struct dhcp_context *context, struct in6_addr *taddr, struct dhcp_netid *netids, int plain_range); struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net, int prefix, u64 addr); void make_duid(time_t now); void dhcp_construct_contexts(time_t now); void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac, unsigned int *maclenp, unsigned int *mactypep); #endif /* rfc3315.c */ #ifdef HAVE_DHCP6 unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *iface_name, struct in6_addr *fallback, struct in6_addr *ll_addr, struct in6_addr *ula_addr, size_t sz, struct in6_addr *client_addr, time_t now); void relay_upstream6(struct dhcp_relay *relay, ssize_t sz, struct in6_addr *peer_address, u32 scope_id); unsigned short relay_reply6( struct sockaddr_in6 *peer, ssize_t sz, char *arrival_interface); #endif /* dhcp-common.c */ #ifdef HAVE_DHCP void dhcp_common_init(void); ssize_t recv_dhcp_packet(int fd, struct msghdr *msg); struct dhcp_netid *run_tag_if(struct dhcp_netid *input); struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags, struct dhcp_opt *opts); int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int negonly); char *strip_hostname(char *hostname); void log_tags(struct dhcp_netid *netid, u32 xid); int match_bytes(struct dhcp_opt *o, unsigned char *p, int len); void dhcp_update_configs(struct dhcp_config *configs); void display_opts(void); int lookup_dhcp_opt(int prot, char *name); int lookup_dhcp_len(int prot, int val); char *option_string(int prot, unsigned int opt, unsigned char *val, int opt_len, char *buf, int buf_len); 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); int config_has_mac(struct dhcp_config *config, unsigned char *hwaddr, int len, int type); #ifdef HAVE_LINUX_NETWORK char *whichdevice(void); void bindtodevice(char *device, int fd); #endif # ifdef HAVE_DHCP6 void display_opts6(void); # endif void log_context(int family, struct dhcp_context *context); void log_relay(int family, struct dhcp_relay *relay); #endif /* outpacket.c */ #ifdef HAVE_DHCP6 void end_opt6(int container); int save_counter(int newval); void *expand(size_t headroom); int new_opt6(int opt); void *put_opt6(void *data, size_t len); void put_opt6_long(unsigned int val); void put_opt6_short(unsigned int val); void put_opt6_char(unsigned int val); void put_opt6_string(char *s); #endif /* radv.c */ #ifdef HAVE_DHCP6 void ra_init(time_t now); void icmp6_packet(time_t now); time_t periodic_ra(time_t now); void ra_start_unsolicted(time_t now, struct dhcp_context *context); #endif /* slaac.c */ #ifdef HAVE_DHCP6 void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force); time_t periodic_slaac(time_t now, struct dhcp_lease *leases); void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases); #endif /* loop.c */ #ifdef HAVE_LOOP void loop_send_probes(); int detect_loop(char *query, int type); #endif /* inotify.c */ #ifdef HAVE_INOTIFY void inotify_dnsmasq_init(); int inotify_check(time_t now); void set_dynamic_inotify(int flag, int total_size, struct crec **rhash, int revhashsz); #endif /* poll.c */ void poll_reset(void); int poll_check(int fd, short event); void poll_listen(int fd, short event); int do_poll(int timeout);