/* * ntp_io.c - input/output routines for ntpd. The socket-opening code * was shamelessly stolen from ntpd. */ #ifdef HAVE_CONFIG_H # include #endif #include "ntp_machine.h" #include "ntpd.h" #include "ntp_io.h" #include "iosignal.h" #include "ntp_refclock.h" #include "ntp_stdlib.h" #include "ntp_request.h" #include "ntp.h" #include "ntp_unixtime.h" /* Don't include ISC's version of IPv6 variables and structures */ #define ISC_IPV6_H 1 #include #include #include #ifdef SIM #include "ntpsim.h" #endif #include #include #ifdef HAVE_SYS_PARAM_H # include #endif /* HAVE_SYS_PARAM_H */ #ifdef HAVE_SYS_IOCTL_H # include #endif #ifdef HAVE_SYS_SOCKIO_H /* UXPV: SIOC* #defines (Frank Vance ) */ # include #endif #ifdef HAVE_SYS_UIO_H # include #endif /* * setsockopt does not always have the same arg declaration * across all platforms. If it's not defined we make it empty */ #ifndef SETSOCKOPT_ARG_CAST #define SETSOCKOPT_ARG_CAST #endif /* * Set up some macros to look for IPv6 and IPv6 multicast */ #if defined(ISC_PLATFORM_HAVEIPV6) && !defined(DISABLE_IPV6) #define INCLUDE_IPV6_SUPPORT #if defined(INCLUDE_IPV6_SUPPORT) && defined(IPV6_JOIN_GROUP) && defined(IPV6_LEAVE_GROUP) #define INCLUDE_IPV6_MULTICAST_SUPPORT #endif /* IPV6 Multicast Support */ #endif /* IPv6 Support */ #ifdef INCLUDE_IPV6_SUPPORT #include #include #include #endif /* !INCLUDE_IPV6_SUPPORT */ extern int listen_to_virtual_ips; extern const char *specific_interface; #if defined(SO_TIMESTAMP) && defined(SCM_TIMESTAMP) #if defined(CMSG_FIRSTHDR) #define HAVE_TIMESTAMP #define USE_TIMESTAMP_CMSG #ifndef TIMESTAMP_CTLMSGBUF_SIZE #define TIMESTAMP_CTLMSGBUF_SIZE 1536 /* moderate default */ #endif #else /* fill in for old/other timestamp interfaces */ #endif #endif #if defined(SYS_WINNT) #include #include /* * Define this macro to control the behavior of connection * resets on UDP sockets. See Microsoft KnowledgeBase Article Q263823 * for details. * NOTE: This requires that Windows 2000 systems install Service Pack 2 * or later. */ #ifndef SIO_UDP_CONNRESET #define SIO_UDP_CONNRESET _WSAIOW(IOC_VENDOR,12) #endif /* * Windows C runtime ioctl() can't deal properly with sockets, * map to ioctlsocket for this source file. */ #define ioctl(fd, opt, val) ioctlsocket((fd), (opt), (u_long *)(val)) #endif /* SYS_WINNT */ /* * We do asynchronous input using the SIGIO facility. A number of * recvbuf buffers are preallocated for input. In the signal * handler we poll to see which sockets are ready and read the * packets from them into the recvbuf's along with a time stamp and * an indication of the source host and the interface it was received * through. This allows us to get as accurate receive time stamps * as possible independent of other processing going on. * * We watch the number of recvbufs available to the signal handler * and allocate more when this number drops below the low water * mark. If the signal handler should run out of buffers in the * interim it will drop incoming frames, the idea being that it is * better to drop a packet than to be inaccurate. */ /* * Other statistics of possible interest */ volatile u_long packets_dropped; /* total number of packets dropped on reception */ volatile u_long packets_ignored; /* packets received on wild card interface */ volatile u_long packets_received; /* total number of packets received */ u_long packets_sent; /* total number of packets sent */ u_long packets_notsent; /* total number of packets which couldn't be sent */ volatile u_long handler_calls; /* number of calls to interrupt handler */ volatile u_long handler_pkts; /* number of pkts received by handler */ u_long io_timereset; /* time counters were reset */ /* * Interface stuff */ struct interface *any_interface; /* default ipv4 interface */ struct interface *any6_interface; /* default ipv6 interface */ struct interface *loopback_interface; /* loopback ipv4 interface */ int ninterfaces; /* Total number of interfaces */ volatile int disable_dynamic_updates; /* when set to != 0 dynamic updates won't happen */ #ifdef REFCLOCK /* * Refclock stuff. We keep a chain of structures with data concerning * the guys we are doing I/O for. */ static struct refclockio *refio; #endif /* REFCLOCK */ /* * Define what the possible "soft" errors can be. These are non-fatal returns * of various network related functions, like recv() and so on. * * For some reason, BSDI (and perhaps others) will sometimes return <0 * from recv() but will have errno==0. This is broken, but we have to * work around it here. */ #define SOFT_ERROR(e) ((e) == EAGAIN || \ (e) == EWOULDBLOCK || \ (e) == EINTR || \ (e) == 0) /* * File descriptor masks etc. for call to select * Not needed for I/O Completion Ports */ fd_set activefds; int maxactivefd; /* * bit alternating value to detect verified interfaces during an update cycle */ static u_char sys_interphase = 0; static struct interface *new_interface P((struct interface *)); static void add_interface P((struct interface *)); static int update_interfaces P((u_short, interface_receiver_t, void *)); static void remove_interface P((struct interface *)); static struct interface *create_interface P((u_short, struct interface *)); static int move_fd P((SOCKET)); /* * Multicast functions */ static isc_boolean_t addr_ismulticast P((struct sockaddr_storage *)); /* * Not all platforms support multicast */ #ifdef MCAST static isc_boolean_t socket_multicast_enable P((struct interface *, int, struct sockaddr_storage *)); static isc_boolean_t socket_multicast_disable P((struct interface *, struct sockaddr_storage *)); #endif #ifdef DEBUG static void print_interface P((struct interface *, char *, char *)); #define DPRINT_INTERFACE(_LVL_, _ARGS_) do { if (debug >= (_LVL_)) { print_interface _ARGS_; } } while (0) #else #define DPRINT_INTERFACE(_LVL_, _ARGS_) do {} while (0) #endif typedef struct vsock vsock_t; enum desc_type { FD_TYPE_SOCKET, FD_TYPE_FILE }; struct vsock { SOCKET fd; enum desc_type type; ISC_LINK(vsock_t) link; }; #if !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET) /* * async notification processing (e. g. routing sockets) */ /* * support for receiving data on fd that is not a refclock or a socket * like e. g. routing sockets */ struct asyncio_reader { SOCKET fd; /* fd to be read */ void *data; /* possibly local data */ void (*receiver)(struct asyncio_reader *); /* input handler */ ISC_LINK(struct asyncio_reader) link; /* the list this is being kept in */ }; ISC_LIST(struct asyncio_reader) asyncio_reader_list; static void delete_asyncio_reader P((struct asyncio_reader *)); static struct asyncio_reader *new_asyncio_reader P((void)); static void add_asyncio_reader P((struct asyncio_reader *, enum desc_type)); static void remove_asyncio_reader P((struct asyncio_reader *)); #endif /* !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET) */ static void init_async_notifications P((void)); static int create_sockets P((u_short)); static SOCKET open_socket P((struct sockaddr_storage *, int, int, struct interface *)); static char * fdbits P((int, fd_set *)); static void set_reuseaddr P((int)); static isc_boolean_t socket_broadcast_enable P((struct interface *, SOCKET, struct sockaddr_storage *)); static isc_boolean_t socket_broadcast_disable P((struct interface *, struct sockaddr_storage *)); ISC_LIST(vsock_t) fd_list; typedef struct remaddr remaddr_t; struct remaddr { struct sockaddr_storage addr; struct interface *interface; ISC_LINK(remaddr_t) link; }; ISC_LIST(remaddr_t) remoteaddr_list; ISC_LIST(struct interface) inter_list; static struct interface *wildipv4 = NULL; static struct interface *wildipv6 = NULL; static void add_fd_to_list P((SOCKET, enum desc_type)); static void close_and_delete_fd_from_list P((SOCKET)); static void add_addr_to_list P((struct sockaddr_storage *, struct interface *)); static void delete_addr_from_list P((struct sockaddr_storage *)); static struct interface *find_addr_in_list P((struct sockaddr_storage *)); static struct interface *find_flagged_addr_in_list P((struct sockaddr_storage *, int)); static void create_wildcards P((u_short)); static isc_boolean_t address_okay P((struct interface *)); static void convert_isc_if P((isc_interface_t *, struct interface *, u_short)); static void delete_interface_from_list P((struct interface *)); static struct interface *getinterface P((struct sockaddr_storage *, int)); static struct interface *findlocalinterface P((struct sockaddr_storage *, int)); static struct interface *findlocalcastinterface P((struct sockaddr_storage *, int)); /* * Routines to read the ntp packets */ #if !defined(HAVE_IO_COMPLETION_PORT) static inline int read_network_packet P((SOCKET, struct interface *, l_fp)); static inline int read_refclock_packet P((SOCKET, struct refclockio *, l_fp)); #endif #ifdef SYS_WINNT /* * Windows 2000 systems incorrectly cause UDP sockets using WASRecvFrom * to not work correctly, returning a WSACONNRESET error when a WSASendTo * fails with an "ICMP port unreachable" response and preventing the * socket from using the WSARecvFrom in subsequent operations. * The function below fixes this, but requires that Windows 2000 * Service Pack 2 or later be installed on the system. NT 4.0 * systems are not affected by this and work correctly. * See Microsoft Knowledge Base Article Q263823 for details of this. */ void connection_reset_fix( SOCKET fd, struct sockaddr_storage *addr ) { DWORD dwBytesReturned = 0; BOOL bNewBehavior = FALSE; DWORD status; /* * disable bad behavior using IOCTL: SIO_UDP_CONNRESET * NT 4.0 has no problem */ if (isc_win32os_majorversion() >= 5) { status = WSAIoctl(fd, SIO_UDP_CONNRESET, &bNewBehavior, sizeof(bNewBehavior), NULL, 0, &dwBytesReturned, NULL, NULL); if (SOCKET_ERROR == status) netsyslog(LOG_ERR, "connection_reset_fix() " "failed for address %s: %m", stoa(addr)); } } #endif /* * on Unix systems the stdio library typically * makes use of file descriptors in the lower * integer range. stdio usually will make use * of the file descriptor in the range of * [0..FOPEN_MAX) * in order to keep this range clean for socket * file descriptors we attempt to move them above * FOPEM_MAX. This is not as easy as it sounds as * FOPEN_MAX changes from implementation to implementation * and may exceed to current file decriptor limits. * We are using following strategy: * - keep a current socket fd boundary initialized with * max(0, min(getdtablesize() - FD_CHUNK, FOPEN_MAX)) * - attempt to move the descriptor to the boundary or * above. * - if that fails and boundary > 0 set boundary * to min(0, socket_fd_boundary - FD_CHUNK) * -> retry * if failure and boundary == 0 return old fd * - on success close old fd return new fd * * effects: * - fds will be moved above the socket fd boundary * if at all possible. * - the socket boundary will be reduced until * allocation is possible or 0 is reached - at this * point the algrithm will be disabled */ static int move_fd(SOCKET fd) { #if !defined(SYS_WINNT) && defined(F_DUPFD) #ifndef FD_CHUNK #define FD_CHUNK 10 #endif /* * number of fds we would like to have for * stdio FILE* available. * we can pick a "low" number as our use of * FILE* is limited to log files and temporarily * to data and config files. Except for log files * we don't keep the other FILE* open beyond the * scope of the function that opened it. */ #ifndef FD_PREFERRED_SOCKBOUNDARY #define FD_PREFERRED_SOCKBOUNDARY 48 #endif #ifndef HAVE_GETDTABLESIZE /* * if we have no idea about the max fd value set up things * so we will start at FOPEN_MAX */ #define getdtablesize() (FOPEN_MAX+FD_CHUNK) #endif #ifndef FOPEN_MAX #define FOPEN_MAX 20 /* assume that for the lack of anything better */ #endif static SOCKET socket_boundary = -1; SOCKET newfd; /* * check whether boundary has be set up * already */ if (socket_boundary == -1) { socket_boundary = max(0, min(getdtablesize() - FD_CHUNK, min(FOPEN_MAX, FD_PREFERRED_SOCKBOUNDARY))); #ifdef DEBUG msyslog(LOG_DEBUG, "ntp_io: estimated max descriptors: %d, initial socket boundary: %d", getdtablesize(), socket_boundary); #endif } /* * Leave a space for stdio to work in. potentially moving the * socket_boundary lower until allocation succeeds. */ do { if (fd >= 0 && fd < socket_boundary) { /* inside reserved range: attempt to move fd */ newfd = fcntl(fd, F_DUPFD, socket_boundary); if (newfd != -1) { /* success: drop the old one - return the new one */ (void)close(fd); return (newfd); } } else { /* outside reserved range: no work - return the original one */ return (fd); } socket_boundary = max(0, socket_boundary - FD_CHUNK); #ifdef DEBUG msyslog(LOG_DEBUG, "ntp_io: selecting new socket boundary: %d", socket_boundary); #endif } while (socket_boundary > 0); #endif /* !defined(SYS_WINNT) && defined(F_DUPFD) */ return (fd); } #ifdef DEBUG_TIMING /* * collect timing information for various processing * paths. currently we only pass then on to the file * for later processing. this could also do histogram * based analysis in other to reduce the load (and skew) * dur to the file output */ void collect_timing(struct recvbuf *rb, const char *tag, int count, l_fp *dts) { char buf[2048]; snprintf(buf, sizeof(buf), "%s %d %s %s", (rb != NULL) ? ((rb->dstadr) ? stoa(&rb->recv_srcadr) : "-REFCLOCK-") : "-", count, lfptoa(dts, 9), tag); record_timing_stats(buf); } #endif /* * About dynamic interfaces, sockets, reception and more... * * the code solves following tasks: * * - keep a current list of active interfaces in order * to bind to to the interface address on NTP_PORT so that * all wild and specific bindings for NTP_PORT are taken by ntpd * to avoid other daemons messing with the time or sockets. * - all interfaces keep a list of peers that are referencing * the interface in order to quickly re-assign the peers to * new interface in case an interface is deleted (=> gone from system or * down) * - have a preconfigured socket ready with the right local address * for transmission and reception * - have an address list for all destination addresses used within ntpd * to find the "right" preconfigured socket. * - facilitate updating the internal interface list with respect to * the current kernel state * * special issues: * * - mapping of multicast addresses to the interface affected is not always * one to one - especially on hosts with multiple interfaces * the code here currently allocates a separate interface entry for those * multicast addresses * iff it is able to bind to a *new* socket with the multicast address (flags |= MCASTIF) * in case of failure the multicast address is bound to an existing interface. * - on some systems it is perfectly legal to assign the same address to * multiple interfaces. Therefore this code does not keep a list of interfaces * but a list of interfaces that represent a unique address as determined by the kernel * by the procedure in findlocalinterface. Thus it is perfectly legal to see only * one representative of a group of real interfaces if they share the same address. * * Frank Kardel 20050910 */ /* * init_io - initialize I/O data structures and call socket creation routine */ void init_io(void) { #ifdef SYS_WINNT init_io_completion_port(); if (!Win32InitSockets()) { netsyslog(LOG_ERR, "No useable winsock.dll: %m"); exit(1); } init_transmitbuff(); #endif /* SYS_WINNT */ /* * Init buffer free list and stat counters */ init_recvbuff(RECV_INIT); packets_dropped = packets_received = 0; packets_ignored = 0; packets_sent = packets_notsent = 0; handler_calls = handler_pkts = 0; io_timereset = 0; loopback_interface = NULL; any_interface = NULL; any6_interface = NULL; #ifdef REFCLOCK refio = NULL; #endif #if defined(HAVE_SIGNALED_IO) (void) set_signal(); #endif ISC_LIST_INIT(fd_list); #if !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET) ISC_LIST_INIT(asyncio_reader_list); #endif ISC_LIST_INIT(remoteaddr_list); ISC_LIST_INIT(inter_list); /* * Create the sockets */ BLOCKIO(); (void) create_sockets(htons(NTP_PORT)); UNBLOCKIO(); init_async_notifications(); DPRINTF(3, ("init_io: maxactivefd %d\n", maxactivefd)); } #ifdef DEBUG /* * function to dump the contents of the interface structure * for debugging use only. */ void interface_dump(struct interface *itf) { u_char* cp; int i; /* Limit the size of the sockaddr_storage hex dump */ int maxsize = min(32, sizeof(struct sockaddr_storage)); printf("Dumping interface: %p\n", itf); printf("fd = %d\n", itf->fd); printf("bfd = %d\n", itf->bfd); printf("sin = %s,\n", stoa(&(itf->sin))); cp = (u_char*) &(itf->sin); for(i = 0; i < maxsize; i++) { printf("%02x", *cp++); if((i+1)%4 == 0) printf(" "); } printf("\n"); printf("bcast = %s,\n", stoa(&(itf->bcast))); cp = (u_char*) &(itf->bcast); for(i = 0; i < maxsize; i++) { printf("%02x", *cp++); if((i+1)%4 == 0) printf(" "); } printf("\n"); printf("mask = %s,\n", stoa(&(itf->mask))); cp = (u_char*) &(itf->mask); for(i = 0; i < maxsize; i++) { printf("%02x", *cp++); if((i+1)%4 == 0) printf(" "); } printf("\n"); printf("name = %s\n", itf->name); printf("flags = 0x%08x\n", itf->flags); printf("last_ttl = %d\n", itf->last_ttl); printf("addr_refid = %08x\n", itf->addr_refid); printf("num_mcast = %d\n", itf->num_mcast); printf("received = %ld\n", itf->received); printf("sent = %ld\n", itf->sent); printf("notsent = %ld\n", itf->notsent); printf("ifindex = %u\n", itf->ifindex); printf("scopeid = %u\n", itf->scopeid); printf("peercnt = %u\n", itf->peercnt); printf("phase = %u\n", itf->phase); } /* * print_interface - helper to output debug information */ static void print_interface(struct interface *iface, char *pfx, char *sfx) { printf("%sinterface #%d: fd=%d, bfd=%d, name=%s, flags=0x%x, scope=%d, ifindex=%d", pfx, iface->ifnum, iface->fd, iface->bfd, iface->name, iface->flags, iface->scopeid, iface->ifindex); /* Leave these as three printf calls. */ printf(", sin=%s", stoa((&iface->sin))); if (iface->flags & INT_BROADCAST) printf(", bcast=%s,", stoa((&iface->bcast))); if (iface->family == AF_INET) printf(", mask=%s", stoa((&iface->mask))); printf(", %s:%s", iface->ignore_packets == ISC_FALSE ? "Enabled" : "Disabled", sfx); if (debug > 4) /* in-depth debugging only */ interface_dump(iface); } #endif #if !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET) /* * create an asyncio_reader structure */ static struct asyncio_reader * new_asyncio_reader() { struct asyncio_reader *reader; reader = (struct asyncio_reader *)emalloc(sizeof(struct asyncio_reader)); memset((char *)reader, 0, sizeof(*reader)); ISC_LINK_INIT(reader, link); reader->fd = INVALID_SOCKET; return reader; } /* * delete a reader */ static void delete_asyncio_reader(struct asyncio_reader *reader) { free(reader); } /* * add asynchio_reader */ static void add_asyncio_reader(struct asyncio_reader *reader, enum desc_type type) { ISC_LIST_APPEND(asyncio_reader_list, reader, link); add_fd_to_list(reader->fd, type); } /* * remove asynchio_reader */ static void remove_asyncio_reader(struct asyncio_reader *reader) { ISC_LIST_UNLINK_TYPE(asyncio_reader_list, reader, link, struct asyncio_reader); if (reader->fd != INVALID_SOCKET) close_and_delete_fd_from_list(reader->fd); reader->fd = INVALID_SOCKET; } #endif /* !defined(HAVE_IO_COMPLETION_PORT) && defined(HAS_ROUTING_SOCKET) */ /* * interface list enumerator - visitor pattern */ void interface_enumerate(interface_receiver_t receiver, void *data) { interface_info_t ifi; struct interface *interf; ifi.action = IFS_EXISTS; for (interf = ISC_LIST_HEAD(inter_list); interf != NULL; interf = ISC_LIST_NEXT(interf, link)) { ifi.interface = interf; receiver(data, &ifi); } } /* * do standard initialization of interface structure */ static void init_interface(struct interface *interface) { memset((char *)interface, 0, sizeof(struct interface)); ISC_LINK_INIT(interface, link); ISC_LIST_INIT(interface->peers); interface->fd = INVALID_SOCKET; interface->bfd = INVALID_SOCKET; interface->num_mcast = 0; interface->received = 0; interface->sent = 0; interface->notsent = 0; interface->peercnt = 0; interface->phase = sys_interphase; } /* * create new interface structure initialize from * template structure or via standard initialization * function */ static struct interface * new_interface(struct interface *interface) { static u_int sys_ifnum = 0; struct interface *iface = (struct interface *)emalloc(sizeof(struct interface)); if (interface != NULL) { memcpy((char*)iface, (char*)interface, sizeof(*interface)); } else { init_interface(iface); } iface->ifnum = sys_ifnum++; /* count every new instance of an interface in the system */ iface->starttime = current_time; return iface; } /* * return interface storage into free memory pool */ static void delete_interface(struct interface *interface) { free(interface); } /* * link interface into list of known interfaces */ static void add_interface(struct interface *interface) { static struct interface *listhead = NULL; /* * For ntpd, the first few interfaces (wildcard, localhost) * will never be removed. This means inter_list.head is * unchanging once initialized. Take advantage of that to * watch for changes and catch corruption earlier. This * helped track down corruption caused by using FD_SET with * a descriptor numerically larger than FD_SETSIZE. */ if (NULL == listhead) listhead = inter_list.head; if (listhead != inter_list.head) { msyslog(LOG_ERR, "add_interface inter_list.head corrupted: was %p now %p", listhead, inter_list.head); exit(1); } /* * Calculate the address hash */ interface->addr_refid = addr2refid(&interface->sin); ISC_LIST_APPEND(inter_list, interface, link); ninterfaces++; } /* * remove interface from known interface list and clean up * associated resources */ static void remove_interface(struct interface *interface) { struct sockaddr_storage resmask; ISC_LIST_UNLINK_TYPE(inter_list, interface, link, struct interface); delete_interface_from_list(interface); if (interface->fd != INVALID_SOCKET) { msyslog(LOG_INFO, "Deleting interface #%d %s, %s#%d, interface stats: received=%ld, sent=%ld, dropped=%ld, active_time=%ld secs", interface->ifnum, interface->name, stoa((&interface->sin)), NTP_PORT, /* XXX should extract port from sin structure */ interface->received, interface->sent, interface->notsent, current_time - interface->starttime); close_and_delete_fd_from_list(interface->fd); } if (interface->bfd != INVALID_SOCKET) { msyslog(LOG_INFO, "Deleting interface #%d %s, broadcast address %s#%d", interface->ifnum, interface->name, stoa((&interface->bcast)), (u_short) NTP_PORT); /* XXX extract port from sin structure */ close_and_delete_fd_from_list(interface->bfd); } ninterfaces--; ntp_monclearinterface(interface); /* remove restrict interface entry */ /* * Blacklist bound interface address */ SET_HOSTMASK(&resmask, interface->sin.ss_family); hack_restrict(RESTRICT_REMOVEIF, &interface->sin, &resmask, RESM_NTPONLY|RESM_INTERFACE, RES_IGNORE); } static void list_if_listening(struct interface *interface, u_short port) { msyslog(LOG_INFO, "Listening on interface #%d %s, %s#%d %s", interface->ifnum, interface->name, stoa((&interface->sin)), ntohs( (u_short) port), (interface->ignore_packets == ISC_FALSE) ? "Enabled": "Disabled"); } static void create_wildcards(u_short port) { isc_boolean_t okipv4 = ISC_TRUE; /* * create pseudo-interface with wildcard IPv4 address */ #ifdef IPV6_V6ONLY if(isc_net_probeipv4() != ISC_R_SUCCESS) okipv4 = ISC_FALSE; #endif if(okipv4 == ISC_TRUE) { struct interface *interface = new_interface(NULL); interface->family = AF_INET; interface->sin.ss_family = AF_INET; ((struct sockaddr_in*)&interface->sin)->sin_addr.s_addr = htonl(INADDR_ANY); ((struct sockaddr_in*)&interface->sin)->sin_port = port; (void) strncpy(interface->name, "wildcard", sizeof(interface->name)); interface->mask.ss_family = AF_INET; ((struct sockaddr_in*)&interface->mask)->sin_addr.s_addr = htonl(~(u_int32)0); interface->flags = INT_BROADCAST | INT_UP | INT_WILDCARD; interface->ignore_packets = ISC_TRUE; #if defined(MCAST) /* * enable possible multicast reception on the broadcast socket */ interface->bcast.ss_family = AF_INET; ((struct sockaddr_in*)&interface->bcast)->sin_port = port; ((struct sockaddr_in*)&interface->bcast)->sin_addr.s_addr = htonl(INADDR_ANY); #endif /* MCAST */ interface->fd = open_socket(&interface->sin, interface->flags, 1, interface); if (interface->fd != INVALID_SOCKET) { wildipv4 = interface; any_interface = interface; add_addr_to_list(&interface->sin, interface); add_interface(interface); list_if_listening(interface, port); } else { msyslog(LOG_ERR, "unable to bind to wildcard socket address %s - another process may be running - EXITING", stoa((&interface->sin))); exit(1); } } #ifdef INCLUDE_IPV6_SUPPORT /* * create pseudo-interface with wildcard IPv6 address */ if (isc_net_probeipv6() == ISC_R_SUCCESS) { struct interface *interface = new_interface(NULL); interface->family = AF_INET6; interface->sin.ss_family = AF_INET6; ((struct sockaddr_in6*)&interface->sin)->sin6_addr = in6addr_any; ((struct sockaddr_in6*)&interface->sin)->sin6_port = port; # ifdef ISC_PLATFORM_HAVESCOPEID ((struct sockaddr_in6*)&interface->sin)->sin6_scope_id = 0; # endif (void) strncpy(interface->name, "wildcard", sizeof(interface->name)); interface->mask.ss_family = AF_INET6; memset(&((struct sockaddr_in6*)&interface->mask)->sin6_addr.s6_addr, 0xff, sizeof(struct in6_addr)); interface->flags = INT_UP | INT_WILDCARD; interface->ignore_packets = ISC_TRUE; interface->fd = open_socket(&interface->sin, interface->flags, 1, interface); if (interface->fd != INVALID_SOCKET) { wildipv6 = interface; any6_interface = interface; add_addr_to_list(&interface->sin, interface); add_interface(interface); list_if_listening(interface, port); } else { msyslog(LOG_ERR, "unable to bind to wildcard socket address %s - another process may be running - EXITING", stoa((&interface->sin))); exit(1); } } #endif } static isc_boolean_t address_okay(struct interface *iface) { DPRINTF(4, ("address_okay: listen Virtual: %d, IF name: %s\n", listen_to_virtual_ips, iface->name)); /* * Always allow the loopback */ if((iface->flags & INT_LOOPBACK) != 0) { DPRINTF(4, ("address_okay: loopback - OK\n")); return (ISC_TRUE); } /* * Check if the interface is specified */ if (specific_interface != NULL) { if (strcasecmp(iface->name, specific_interface) == 0) { DPRINTF(4, ("address_okay: specific interface name matched - OK\n")); return (ISC_TRUE); } else { DPRINTF(4, ("address_okay: specific interface name NOT matched - FAIL\n")); return (ISC_FALSE); } } else { if (listen_to_virtual_ips == 0 && (strchr(iface->name, (int)':') != NULL)) { DPRINTF(4, ("address_okay: virtual ip/alias - FAIL\n")); return (ISC_FALSE); } } DPRINTF(4, ("address_okay: OK\n")); return (ISC_TRUE); } static void convert_isc_if(isc_interface_t *isc_if, struct interface *itf, u_short port) { itf->scopeid = 0; itf->family = (short) isc_if->af; strcpy(itf->name, isc_if->name); if(isc_if->af == AF_INET) { itf->sin.ss_family = (u_short) isc_if->af; memcpy(&(((struct sockaddr_in*)&itf->sin)->sin_addr), &(isc_if->address.type.in), sizeof(struct in_addr)); ((struct sockaddr_in*)&itf->sin)->sin_port = port; if((isc_if->flags & INTERFACE_F_BROADCAST) != 0) { itf->flags |= INT_BROADCAST; itf->bcast.ss_family = itf->sin.ss_family; memcpy(&(((struct sockaddr_in*)&itf->bcast)->sin_addr), &(isc_if->broadcast.type.in), sizeof(struct in_addr)); ((struct sockaddr_in*)&itf->bcast)->sin_port = port; } itf->mask.ss_family = itf->sin.ss_family; memcpy(&(((struct sockaddr_in*)&itf->mask)->sin_addr), &(isc_if->netmask.type.in), sizeof(struct in_addr)); ((struct sockaddr_in*)&itf->mask)->sin_port = port; } #ifdef INCLUDE_IPV6_SUPPORT else if (isc_if->af == AF_INET6) { itf->sin.ss_family = (u_short) isc_if->af; memcpy(&(((struct sockaddr_in6 *)&itf->sin)->sin6_addr), &(isc_if->address.type.in6), sizeof(((struct sockaddr_in6 *)&itf->sin)->sin6_addr)); ((struct sockaddr_in6 *)&itf->sin)->sin6_port = port; #ifdef ISC_PLATFORM_HAVESCOPEID ((struct sockaddr_in6 *)&itf->sin)->sin6_scope_id = isc_netaddr_getzone(&isc_if->address); itf->scopeid = isc_netaddr_getzone(&isc_if->address); #endif itf->mask.ss_family = itf->sin.ss_family; memcpy(&(((struct sockaddr_in6 *)&itf->mask)->sin6_addr), &(isc_if->netmask.type.in6), sizeof(struct in6_addr)); ((struct sockaddr_in6 *)&itf->mask)->sin6_port = port; /* Copy the interface index */ itf->ifindex = isc_if->ifindex; } #endif /* INCLUDE_IPV6_SUPPORT */ /* Process the rest of the flags */ if((isc_if->flags & INTERFACE_F_UP) != 0) itf->flags |= INT_UP; if((isc_if->flags & INTERFACE_F_LOOPBACK) != 0) itf->flags |= INT_LOOPBACK; if((isc_if->flags & INTERFACE_F_POINTTOPOINT) != 0) itf->flags |= INT_PPP; if((isc_if->flags & INTERFACE_F_MULTICAST) != 0) itf->flags |= INT_MULTICAST; } /* * refresh_interface * * some OSes have been observed to keep * cached routes even when more specific routes * become available. * this can be mitigated by re-binding * the socket. */ static int refresh_interface(struct interface * interface) { #ifdef OS_MISSES_SPECIFIC_ROUTE_UPDATES if (interface->fd != INVALID_SOCKET) { close_and_delete_fd_from_list(interface->fd); interface->fd = open_socket(&interface->sin, interface->flags, 0, interface); /* * reset TTL indication so TTL is is set again * next time around */ interface->last_ttl = 0; return interface->fd != INVALID_SOCKET; } else { return 0; /* invalid sockets are not refreshable */ } #else /* !OS_MISSES_SPECIFIC_ROUTE_UPDATES */ return interface->fd != INVALID_SOCKET; #endif /* !OS_MISSES_SPECIFIC_ROUTE_UPDATES */ } /* * interface_update - externally callable update function */ void interface_update(interface_receiver_t receiver, void *data) { if (!disable_dynamic_updates) { int new_interface_found; BLOCKIO(); new_interface_found = update_interfaces(htons(NTP_PORT), receiver, data); UNBLOCKIO(); if (new_interface_found) { #ifdef DEBUG msyslog(LOG_DEBUG, "new interface(s) found: waking up resolver"); #endif #ifdef SYS_WINNT /* wake up the resolver thread */ if (ResolverEventHandle != NULL) SetEvent(ResolverEventHandle); #else /* write any single byte to the pipe to wake up the resolver process */ write( resolver_pipe_fd[1], &new_interface_found, 1 ); #endif } } } /* * find out if a given interface structure contains * a wildcard address */ static int is_wildcard_addr(struct sockaddr_storage *sas) { if (sas->ss_family == AF_INET && ((struct sockaddr_in*)sas)->sin_addr.s_addr == htonl(INADDR_ANY)) return 1; #ifdef INCLUDE_IPV6_SUPPORT if (sas->ss_family == AF_INET6 && memcmp(&((struct sockaddr_in6*)sas)->sin6_addr, &in6addr_any, sizeof(in6addr_any) == 0)) return 1; #endif return 0; } #ifdef OS_NEEDS_REUSEADDR_FOR_IFADDRBIND /* * enable/disable re-use of wildcard address socket */ static void set_wildcard_reuse(int family, int on) { int onvalue = 1; int offvalue = 0; int *onoff; SOCKET fd = INVALID_SOCKET; onoff = on ? &onvalue : &offvalue; switch (family) { case AF_INET: if (any_interface) { fd = any_interface->fd; } break; #ifdef INCLUDE_IPV6_SUPPORT case AF_INET6: if (any6_interface) { fd = any6_interface->fd; } break; #endif /* !INCLUDE_IPV6_SUPPORT */ } if (fd != INVALID_SOCKET) { if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)onoff, sizeof(*onoff))) { netsyslog(LOG_ERR, "set_wildcard_reuse: setsockopt(SO_REUSEADDR, %s) failed: %m", *onoff ? "on" : "off"); } DPRINTF(4, ("set SO_REUSEADDR to %s on %s\n", *onoff ? "ON" : "OFF", stoa((family == AF_INET) ? &any_interface->sin : &any6_interface->sin))); } } #endif /* OS_NEEDS_REUSEADDR_FOR_IFADDRBIND */ #ifdef INCLUDE_IPV6_SUPPORT static isc_boolean_t is_anycast(struct sockaddr *sa, char *name) { #if defined(SIOCGIFAFLAG_IN6) && defined(IN6_IFF_ANYCAST) struct in6_ifreq ifr6; int fd; u_int32_t flags6; if (sa->sa_family != AF_INET6) return ISC_FALSE; if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) return ISC_FALSE; memset(&ifr6, 0, sizeof(ifr6)); memcpy(&ifr6.ifr_addr, (struct sockaddr_in6 *)sa, sizeof(struct sockaddr_in6)); strlcpy(ifr6.ifr_name, name, IF_NAMESIZE); if (ioctl(fd, SIOCGIFAFLAG_IN6, &ifr6) < 0) { close(fd); return ISC_FALSE; } close(fd); flags6 = ifr6.ifr_ifru.ifru_flags6; if ((flags6 & IN6_IFF_ANYCAST) != 0) return ISC_TRUE; #endif /* !SIOCGIFAFLAG_IN6 || !IN6_IFF_ANYCAST */ return ISC_FALSE; } #endif /* !INCLUDE_IPV6_SUPPORT */ /* * update_interface strategy * * toggle configuration phase * * Phase 1: * forall currently existing interfaces * if address is known: * drop socket - rebind again * * if address is NOT known: * attempt to create a new interface entry * * Phase 2: * forall currently known non MCAST and WILDCARD interfaces * if interface does not match configuration phase (not seen in phase 1): * remove interface from known interface list * forall peers associated with this interface * disconnect peer from this interface * * Phase 3: * attempt to re-assign interfaces to peers * */ static int update_interfaces( u_short port, interface_receiver_t receiver, void *data ) { interface_info_t ifi; isc_mem_t *mctx = NULL; isc_interfaceiter_t *iter = NULL; isc_boolean_t scan_ipv4 = ISC_FALSE; isc_boolean_t scan_ipv6 = ISC_FALSE; isc_result_t result; int new_interface_found = 0; DPRINTF(3, ("update_interfaces(%d)\n", ntohs( (u_short) port))); #ifdef INCLUDE_IPV6_SUPPORT if (isc_net_probeipv6() == ISC_R_SUCCESS) scan_ipv6 = ISC_TRUE; #if defined(DEBUG) else if (debug) netsyslog(LOG_ERR, "no IPv6 interfaces found"); #endif #endif if (isc_net_probeipv6() == ISC_R_SUCCESS) scan_ipv6 = ISC_TRUE; #if defined(ISC_PLATFORM_HAVEIPV6) && defined(DEBUG) else if (debug) netsyslog(LOG_ERR, "no IPv6 interfaces found"); #endif if (isc_net_probeipv4() == ISC_R_SUCCESS) scan_ipv4 = ISC_TRUE; #ifdef DEBUG else if(debug) netsyslog(LOG_ERR, "no IPv4 interfaces found"); #endif /* * phase one - scan interfaces * - create those that are not found * - update those that are found */ result = isc_interfaceiter_create(mctx, &iter); if (result != ISC_R_SUCCESS) return 0; sys_interphase ^= 0x1; /* toggle system phase for finding untouched (to be deleted) interfaces */ for (result = isc_interfaceiter_first(iter); result == ISC_R_SUCCESS; result = isc_interfaceiter_next(iter)) { isc_interface_t isc_if; unsigned int family; struct interface interface; struct interface *iface; result = isc_interfaceiter_current(iter, &isc_if); if (result != ISC_R_SUCCESS) break; /* See if we have a valid family to use */ family = isc_if.address.family; if (family != AF_INET && family != AF_INET6) continue; if (scan_ipv4 == ISC_FALSE && family == AF_INET) continue; if (scan_ipv6 == ISC_FALSE && family == AF_INET6) continue; /* * create prototype */ init_interface(&interface); convert_isc_if(&isc_if, &interface, port); /* * Check to see if we are going to use the interface * If we don't use it we mark it to drop any packet * received but we still must create the socket and * bind to it. This prevents other apps binding to it * and potentially causing problems with more than one * process fiddling with the clock */ if (address_okay(&interface) == ISC_TRUE) { interface.ignore_packets = ISC_FALSE; } else { interface.ignore_packets = ISC_TRUE; } DPRINT_INTERFACE(4, (&interface, "examining ", "\n")); if (!(interface.flags & INT_UP)) { /* interfaces must be UP to be usable */ DPRINTF(4, ("skipping interface %s (%s) - DOWN\n", interface.name, stoa(&interface.sin))); continue; } /* * skip any interfaces UP and bound to a wildcard * address - some dhcp clients produce that in the * wild */ if (is_wildcard_addr(&interface.sin)) continue; #ifdef INCLUDE_IPV6_SUPPORT if (is_anycast((struct sockaddr *)&interface.sin, isc_if.name)) continue; #endif /* !INCLUDE_IPV6_SUPPORT */ /* * map to local *address* in order * to map all duplicate interfaces to an interface structure * with the appropriate socket (our name space is * (ip-address) - NOT (interface name, ip-address)) */ iface = getinterface(&interface.sin, INT_WILDCARD); if (iface && refresh_interface(iface)) { /* * found existing and up to date interface - mark present */ iface->phase = sys_interphase; DPRINT_INTERFACE(4, (iface, "updating ", " present\n")); ifi.action = IFS_EXISTS; ifi.interface = iface; if (receiver) receiver(data, &ifi); } else { /* * this is new or refreshing failed - add to our interface list * if refreshing failed we will delete the interface structure in * phase 2 as the interface was not marked current. We can bind to * the address as the refresh code already closed the offending socket */ iface = create_interface(port, &interface); if (iface) { ifi.action = IFS_CREATED; ifi.interface = iface; if (receiver) receiver(data, &ifi); new_interface_found = 1; DPRINT_INTERFACE(3, (iface, "updating ", " new - created\n")); } else { DPRINT_INTERFACE(3, (&interface, "updating ", " new - creation FAILED")); msyslog(LOG_INFO, "failed to initialize interface for address %s", stoa(&interface.sin)); continue; } } } isc_interfaceiter_destroy(&iter); /* * phase 2 - delete gone interfaces - reassigning peers to other interfaces */ { struct interface *interf = ISC_LIST_HEAD(inter_list); while (interf != NULL) { struct interface *next = ISC_LIST_NEXT(interf, link); if (!(interf->flags & (INT_WILDCARD|INT_MCASTIF))) { /* * if phase does not match sys_phase this interface was not * enumerated during interface scan - so it is gone and * will be deleted here unless it is solely an MCAST/WILDCARD interface */ if (interf->phase != sys_interphase) { struct peer *peer; DPRINT_INTERFACE(3, (interf, "updating ", "GONE - deleting\n")); remove_interface(interf); ifi.action = IFS_DELETED; ifi.interface = interf; if (receiver) receiver(data, &ifi); peer = ISC_LIST_HEAD(interf->peers); /* * disconnect peer from deleted interface */ while (peer != NULL) { struct peer *npeer = ISC_LIST_NEXT(peer, ilink); /* * this one just lost it's interface */ set_peerdstadr(peer, NULL); peer = npeer; } /* * update globals in case we lose * a loopback interface */ if (interf == loopback_interface) loopback_interface = NULL; delete_interface(interf); } } interf = next; } } /* * phase 3 - re-configure as the world has changed if necessary */ refresh_all_peerinterfaces(); return new_interface_found; } /* * create_sockets - create a socket for each interface plus a default * socket for when we don't know where to send */ static int create_sockets( u_short port ) { #ifndef HAVE_IO_COMPLETION_PORT /* * I/O Completion Ports don't care about the select and FD_SET */ maxactivefd = 0; FD_ZERO(&activefds); #endif DPRINTF(2, ("create_sockets(%d)\n", ntohs( (u_short) port))); create_wildcards(port); update_interfaces(port, NULL, NULL); /* * Now that we have opened all the sockets, turn off the reuse * flag for security. */ set_reuseaddr(0); DPRINTF(2, ("create_sockets: Total interfaces = %d\n", ninterfaces)); return ninterfaces; } /* * create_interface - create a new interface for a given prototype * binding the socket. */ static struct interface * create_interface( u_short port, struct interface *iface ) { struct sockaddr_storage resmask; struct interface *interface; DPRINTF(2, ("create_interface(%s#%d)\n", stoa(&iface->sin), ntohs( (u_short) port))); /* build an interface */ interface = new_interface(iface); /* * create socket */ interface->fd = open_socket(&interface->sin, interface->flags, 0, interface); if (interface->fd != INVALID_SOCKET) list_if_listening(interface, port); if ((interface->flags & INT_BROADCAST) && interface->bfd != INVALID_SOCKET) msyslog(LOG_INFO, "Listening on broadcast address %s#%d", stoa((&interface->bcast)), ntohs( (u_short) port)); if (interface->fd == INVALID_SOCKET && interface->bfd == INVALID_SOCKET) { msyslog(LOG_ERR, "unable to create socket on %s (%d) for %s#%d", interface->name, interface->ifnum, stoa((&interface->sin)), ntohs( (u_short) port)); delete_interface(interface); return NULL; } /* * Blacklist bound interface address */ SET_HOSTMASK(&resmask, interface->sin.ss_family); hack_restrict(RESTRICT_FLAGS, &interface->sin, &resmask, RESM_NTPONLY|RESM_INTERFACE, RES_IGNORE); /* * set globals with the first found * loopback interface of the appropriate class */ if ((loopback_interface == NULL) && (interface->family == AF_INET) && ((interface->flags & INT_LOOPBACK) != 0)) { loopback_interface = interface; } /* * put into our interface list */ add_addr_to_list(&interface->sin, interface); add_interface(interface); DPRINT_INTERFACE(2, (interface, "created ", "\n")); return interface; } #ifdef SO_EXCLUSIVEADDRUSE static void set_excladdruse(int fd) { int one = 1; int failed; failed = setsockopt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *)&one, sizeof(one)); if (failed) netsyslog(LOG_ERR, "setsockopt(%d, SO_EXCLUSIVEADDRUSE, on): %m", fd); } #endif /* SO_EXCLUSIVEADDRUSE */ /* * set_reuseaddr() - set/clear REUSEADDR on all sockets * NB possible hole - should we be doing this on broadcast * fd's also? */ static void set_reuseaddr(int flag) { struct interface *interf; #ifndef SO_EXCLUSIVEADDRUSE for (interf = ISC_LIST_HEAD(inter_list); interf != NULL; interf = ISC_LIST_NEXT(interf, link)) { if (interf->flags & INT_WILDCARD) continue; /* * if interf->fd is INVALID_SOCKET, we might have a adapter * configured but not present */ DPRINTF(4, ("setting SO_REUSEADDR on %.16s@%s to %s\n", interf->name, stoa(&interf->sin), flag ? "on" : "off")); if (interf->fd != INVALID_SOCKET) { if (setsockopt(interf->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&flag, sizeof(flag))) { netsyslog(LOG_ERR, "set_reuseaddr: setsockopt(SO_REUSEADDR, %s) failed: %m", flag ? "on" : "off"); } } } #endif /* ! SO_EXCLUSIVEADDRUSE */ } /* * This is just a wrapper around an internal function so we can * make other changes as necessary later on */ void enable_broadcast(struct interface *iface, struct sockaddr_storage *baddr) { #ifdef SO_BROADCAST socket_broadcast_enable(iface, iface->fd, baddr); #endif } #ifdef OPEN_BCAST_SOCKET /* * Enable a broadcast address to a given socket * The socket is in the inter_list all we need to do is enable * broadcasting. It is not this function's job to select the socket */ static isc_boolean_t socket_broadcast_enable(struct interface *iface, SOCKET fd, struct sockaddr_storage *maddr) { #ifdef SO_BROADCAST int on = 1; if (maddr->ss_family == AF_INET) { /* if this interface can support broadcast, set SO_BROADCAST */ if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *)&on, sizeof(on))) { netsyslog(LOG_ERR, "setsockopt(SO_BROADCAST) enable failure on address %s: %m", stoa(maddr)); } #ifdef DEBUG else if (debug > 1) { printf("Broadcast enabled on socket %d for address %s\n", fd, stoa(maddr)); } #endif } iface->flags |= INT_BCASTOPEN; return ISC_TRUE; #else return ISC_FALSE; #endif /* SO_BROADCAST */ } /* * Remove a broadcast address from a given socket * The socket is in the inter_list all we need to do is disable * broadcasting. It is not this function's job to select the socket */ static isc_boolean_t socket_broadcast_disable(struct interface *iface, struct sockaddr_storage *maddr) { #ifdef SO_BROADCAST int off = 0; /* This seems to be OK as an int */ if (maddr->ss_family == AF_INET) { if (setsockopt(iface->fd, SOL_SOCKET, SO_BROADCAST, (char *)&off, sizeof(off))) { netsyslog(LOG_ERR, "setsockopt(SO_BROADCAST) disable failure on address %s: %m", stoa(maddr)); } } iface->flags &= ~INT_BCASTOPEN; return ISC_TRUE; #else return ISC_FALSE; #endif /* SO_BROADCAST */ } #endif /* OPEN_BCAST_SOCKET */ /* * Check to see if the address is a multicast address */ static isc_boolean_t addr_ismulticast(struct sockaddr_storage *maddr) { switch (maddr->ss_family) { case AF_INET : if (!IN_CLASSD(ntohl(((struct sockaddr_in*)maddr)->sin_addr.s_addr))) { DPRINTF(4, ("multicast address %s not class D\n", stoa(maddr))); return (ISC_FALSE); } else { return (ISC_TRUE); } case AF_INET6 : #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT if (!IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6*)maddr)->sin6_addr)) { DPRINTF(4, ("address %s not IPv6 multicast address\n", stoa(maddr))); return (ISC_FALSE); } else { return (ISC_TRUE); } /* * If we don't have IPV6 support any IPV6 address is not multicast */ #else return (ISC_FALSE); #endif /* * Never valid */ default: return (ISC_FALSE); } } /* * Multicast servers need to set the appropriate Multicast interface * socket option in order for it to know which interface to use for * send the multicast packet. */ void enable_multicast_if(struct interface *iface, struct sockaddr_storage *maddr) { #ifdef MCAST #ifdef IP_MULTICAST_LOOP /*u_char*/ TYPEOF_IP_MULTICAST_LOOP off = 0; #endif #ifdef IPV6_MULTICAST_LOOP u_int off6 = 0; /* RFC 3493, 5.2. defines type unsigned int */ #endif switch (maddr->ss_family) { case AF_INET: if (setsockopt(iface->fd, IPPROTO_IP, IP_MULTICAST_IF, (char *)&(((struct sockaddr_in*)&iface->sin)->sin_addr.s_addr), sizeof(struct in_addr)) == -1) { netsyslog(LOG_ERR, "setsockopt IP_MULTICAST_IF failure: %m on socket %d, addr %s for multicast address %s", iface->fd, stoa(&iface->sin), stoa(maddr)); return; } #ifdef IP_MULTICAST_LOOP /* * Don't send back to itself, but allow it to fail to set it */ if (setsockopt(iface->fd, IPPROTO_IP, IP_MULTICAST_LOOP, SETSOCKOPT_ARG_CAST &off, sizeof(off)) == -1) { netsyslog(LOG_ERR, "setsockopt IP_MULTICAST_LOOP failure: %m on socket %d, addr %s for multicast address %s", iface->fd, stoa(&iface->sin), stoa(maddr)); } #endif DPRINTF(4, ("Added IPv4 multicast interface on socket %d, addr %s for multicast address %s\n", iface->fd, stoa(&iface->sin), stoa(maddr))); break; case AF_INET6: #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT if (setsockopt(iface->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, (char *) &iface->scopeid, sizeof(iface->scopeid)) == -1) { netsyslog(LOG_ERR, "setsockopt IPV6_MULTICAST_IF failure: %m on socket %d, addr %s, scope %d for multicast address %s", iface->fd, stoa(&iface->sin), iface->scopeid, stoa(maddr)); return; } #ifdef IPV6_MULTICAST_LOOP /* * Don't send back to itself, but allow it to fail to set it */ if (setsockopt(iface->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, (char *) &off6, sizeof(off6)) == -1) { netsyslog(LOG_ERR, "setsockopt IPV6_MULTICAST_LOOP failure: %m on socket %d, addr %s for multicast address %s", iface->fd, stoa(&iface->sin), stoa(maddr)); } #endif DPRINTF(4, ("Added IPv6 multicast interface on socket %d, addr %s, scope %d for multicast address %s\n", iface->fd, stoa(&iface->sin), iface->scopeid, stoa(maddr))); break; #else return; #endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */ } return; #endif } /* * Add a multicast address to a given socket * The socket is in the inter_list all we need to do is enable * multicasting. It is not this function's job to select the socket */ static isc_boolean_t socket_multicast_enable(struct interface *iface, int lscope, struct sockaddr_storage *maddr) { #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT struct ipv6_mreq mreq6; struct in6_addr iaddr6; #endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */ struct ip_mreq mreq; if (find_addr_in_list(maddr)) { DPRINTF(4, ("socket_multicast_enable(%s): already enabled\n", stoa(maddr))); return ISC_TRUE; } switch (maddr->ss_family) { case AF_INET: memset((char *)&mreq, 0, sizeof(mreq)); mreq.imr_multiaddr = (((struct sockaddr_in*)maddr)->sin_addr); mreq.imr_interface.s_addr = htonl(INADDR_ANY); if (setsockopt(iface->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char *)&mreq, sizeof(mreq)) == -1) { netsyslog(LOG_ERR, "setsockopt IP_ADD_MEMBERSHIP failure: %m on socket %d, addr %s for %x / %x (%s)", iface->fd, stoa(&iface->sin), mreq.imr_multiaddr.s_addr, mreq.imr_interface.s_addr, stoa(maddr)); return ISC_FALSE; } DPRINTF(4, ("Added IPv4 multicast membership on socket %d, addr %s for %x / %x (%s)\n", iface->fd, stoa(&iface->sin), mreq.imr_multiaddr.s_addr, mreq.imr_interface.s_addr, stoa(maddr))); break; case AF_INET6: #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT /* * Enable reception of multicast packets * If the address is link-local we can get the interface index * from the scope id. Don't do this for other types of multicast * addresses. For now let the kernel figure it out. */ memset((char *)&mreq6, 0, sizeof(mreq6)); iaddr6 = ((struct sockaddr_in6*)maddr)->sin6_addr; mreq6.ipv6mr_multiaddr = iaddr6; mreq6.ipv6mr_interface = lscope; if (setsockopt(iface->fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, (char *)&mreq6, sizeof(mreq6)) == -1) { netsyslog(LOG_ERR, "setsockopt IPV6_JOIN_GROUP failure: %m on socket %d, addr %s for interface %d(%s)", iface->fd, stoa(&iface->sin), mreq6.ipv6mr_interface, stoa(maddr)); return ISC_FALSE; } DPRINTF(4, ("Added IPv6 multicast group on socket %d, addr %s for interface %d(%s)\n", iface->fd, stoa(&iface->sin), mreq6.ipv6mr_interface, stoa(maddr))); break; #else return ISC_FALSE; #endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */ } iface->flags |= INT_MCASTOPEN; iface->num_mcast++; add_addr_to_list(maddr, iface); return ISC_TRUE; } /* * Remove a multicast address from a given socket * The socket is in the inter_list all we need to do is disable * multicasting. It is not this function's job to select the socket */ static isc_boolean_t socket_multicast_disable(struct interface *iface, struct sockaddr_storage *maddr) { #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT struct ipv6_mreq mreq6; struct in6_addr iaddr6; #endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */ struct ip_mreq mreq; memset((char *)&mreq, 0, sizeof(mreq)); if (find_addr_in_list(maddr) == NULL) { DPRINTF(4, ("socket_multicast_disable(%s): not enabled\n", stoa(maddr))); return ISC_TRUE; } switch (maddr->ss_family) { case AF_INET: mreq.imr_multiaddr = (((struct sockaddr_in*)&maddr)->sin_addr); mreq.imr_interface.s_addr = ((struct sockaddr_in*)&iface->sin)->sin_addr.s_addr; if (setsockopt(iface->fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (char *)&mreq, sizeof(mreq)) == -1) { netsyslog(LOG_ERR, "setsockopt IP_DROP_MEMBERSHIP failure: %m on socket %d, addr %s for %x / %x (%s)", iface->fd, stoa(&iface->sin), mreq.imr_multiaddr.s_addr, mreq.imr_interface.s_addr, stoa(maddr)); return ISC_FALSE; } break; case AF_INET6: #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT /* * Disable reception of multicast packets * If the address is link-local we can get the interface index * from the scope id. Don't do this for other types of multicast * addresses. For now let the kernel figure it out. */ iaddr6 = ((struct sockaddr_in6*)&maddr)->sin6_addr; mreq6.ipv6mr_multiaddr = iaddr6; mreq6.ipv6mr_interface = iface->scopeid; if (setsockopt(iface->fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, (char *)&mreq6, sizeof(mreq6)) == -1) { netsyslog(LOG_ERR, "setsockopt IPV6_LEAVE_GROUP failure: %m on socket %d, addr %s for %d(%s)", iface->fd, stoa(&iface->sin), mreq6.ipv6mr_interface, stoa(maddr)); return ISC_FALSE; } break; #else return ISC_FALSE; #endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */ } iface->num_mcast--; if (iface->num_mcast <= 0) { iface->num_mcast = 0; iface->flags &= ~INT_MCASTOPEN; } return ISC_TRUE; } /* * io_setbclient - open the broadcast client sockets */ void io_setbclient(void) { #ifdef OPEN_BCAST_SOCKET struct interface *interf; int nif = 0; isc_boolean_t jstatus; SOCKET fd; set_reuseaddr(1); for (interf = ISC_LIST_HEAD(inter_list); interf != NULL; interf = ISC_LIST_NEXT(interf, link)) { if (interf->flags & INT_WILDCARD) continue; /* use only allowed addresses */ if (interf->ignore_packets == ISC_TRUE) continue; /* Only IPv4 addresses are valid for broadcast */ if (interf->sin.ss_family != AF_INET) continue; /* Is this a broadcast address? */ if (!(interf->flags & INT_BROADCAST)) continue; /* Skip the loopback addresses */ if (interf->flags & INT_LOOPBACK) continue; /* Do we already have the broadcast address open? */ if (interf->flags & INT_BCASTOPEN) { /* account for already open interfaces to aviod misleading warning below */ nif++; continue; } /* * Try to open the broadcast address */ interf->family = AF_INET; interf->bfd = open_socket(&interf->bcast, INT_BROADCAST, 0, interf); /* * If we succeeded then we use it otherwise * enable the underlying address */ if (interf->bfd == INVALID_SOCKET) { fd = interf->fd; } else { fd = interf->bfd; } /* Enable Broadcast on socket */ jstatus = socket_broadcast_enable(interf, fd, &interf->sin); if (jstatus == ISC_TRUE) { nif++; netsyslog(LOG_INFO,"io_setbclient: Opened broadcast client on interface #%d %s, socket: %d", interf->ifnum, interf->name, fd); interf->addr_refid = addr2refid(&interf->sin); } } set_reuseaddr(0); #ifdef DEBUG if (debug) if (nif > 0) printf("io_setbclient: Opened broadcast clients\n"); #endif if (nif == 0) netsyslog(LOG_ERR, "Unable to listen for broadcasts, no broadcast interfaces available"); #else netsyslog(LOG_ERR, "io_setbclient: Broadcast Client disabled by build"); #endif } /* * io_unsetbclient - close the broadcast client sockets */ void io_unsetbclient(void) { struct interface *interf; isc_boolean_t lstatus; for (interf = ISC_LIST_HEAD(inter_list); interf != NULL; interf = ISC_LIST_NEXT(interf, link)) { if (interf->flags & INT_WILDCARD) continue; if (!(interf->flags & INT_BCASTOPEN)) continue; lstatus = socket_broadcast_disable(interf, &interf->sin); } } /* * io_multicast_add() - add multicast group address */ void io_multicast_add( struct sockaddr_storage addr ) { #ifdef MCAST struct interface *interface; #ifndef MULTICAST_NONEWSOCKET struct interface *iface; #endif int lscope = 0; /* * Check to see if this is a multicast address */ if (addr_ismulticast(&addr) == ISC_FALSE) return; /* If we already have it we can just return */ if (find_flagged_addr_in_list(&addr, INT_MCASTOPEN|INT_MCASTIF) != NULL) { netsyslog(LOG_INFO, "Duplicate request found for multicast address %s", stoa(&addr)); return; } #ifndef MULTICAST_NONEWSOCKET interface = new_interface(NULL); /* * Open a new socket for the multicast address */ interface->sin.ss_family = addr.ss_family; interface->family = addr.ss_family; switch(addr.ss_family) { case AF_INET: memcpy(&(((struct sockaddr_in *)&interface->sin)->sin_addr), &(((struct sockaddr_in*)&addr)->sin_addr), sizeof(struct in_addr)); ((struct sockaddr_in*)&interface->sin)->sin_port = htons(NTP_PORT); memset(&((struct sockaddr_in*)&interface->mask)->sin_addr.s_addr, 0xff, sizeof(struct in_addr)); break; case AF_INET6: #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT memcpy(&(((struct sockaddr_in6 *)&interface->sin)->sin6_addr), &((struct sockaddr_in6*)&addr)->sin6_addr, sizeof(struct in6_addr)); ((struct sockaddr_in6*)&interface->sin)->sin6_port = htons(NTP_PORT); #ifdef ISC_PLATFORM_HAVESCOPEID ((struct sockaddr_in6*)&interface->sin)->sin6_scope_id = ((struct sockaddr_in6*)&addr)->sin6_scope_id; #endif memset(&((struct sockaddr_in6*)&interface->mask)->sin6_addr.s6_addr, 0xff, sizeof(struct in6_addr)); #endif iface = findlocalcastinterface(&addr, INT_MULTICAST); if (iface) { # ifdef ISC_PLATFORM_HAVESCOPEID lscope = ((struct sockaddr_in6*)&iface->sin)->sin6_scope_id; # endif DPRINTF(4, ("Found interface #%d %s, scope: %d for address %s\n", iface->ifnum, iface->name, lscope, stoa(&addr))); } break; } set_reuseaddr(1); interface->bfd = INVALID_SOCKET; interface->fd = open_socket(&interface->sin, INT_MULTICAST, 0, interface); if (interface->fd != INVALID_SOCKET) { interface->bfd = INVALID_SOCKET; interface->ignore_packets = ISC_FALSE; interface->flags |= INT_MCASTIF; (void) strncpy(interface->name, "multicast", sizeof(interface->name)); ((struct sockaddr_in*)&interface->mask)->sin_addr.s_addr = htonl(~(u_int32)0); DPRINT_INTERFACE(2, (interface, "multicast add ", "\n")); /* socket_multicast_enable() will add this address to the addresslist */ add_interface(interface); list_if_listening(interface, htons(NTP_PORT)); } else { delete_interface(interface); /* re-use existing interface */ interface = NULL; if (addr.ss_family == AF_INET) interface = wildipv4; else if (addr.ss_family == AF_INET6) interface = wildipv6; if (interface != NULL) { /* HACK ! -- stuff in an address */ interface->bcast = addr; netsyslog(LOG_ERR, "...multicast address %s using wildcard interface #%d %s", stoa(&addr), interface->ifnum, interface->name); } else { netsyslog(LOG_ERR, "No multicast socket available to use for address %s", stoa(&addr)); return; } } #else /* * For the case where we can't use a separate socket */ interface = findlocalcastinterface(&addr, INT_MULTICAST); /* * If we don't have a valid socket, just return */ if (!interface) { netsyslog(LOG_ERR, "Cannot add multicast address %s: Cannot find slot", stoa(&addr)); return; } #endif { isc_boolean_t jstatus; jstatus = socket_multicast_enable(interface, lscope, &addr); if (jstatus == ISC_TRUE) netsyslog(LOG_INFO, "Added Multicast Listener %s on interface #%d %s\n", stoa(&addr), interface->ifnum, interface->name); else netsyslog(LOG_ERR, "Failed to add Multicast Listener %s\n", stoa(&addr)); } #else /* MCAST */ netsyslog(LOG_ERR, "Cannot add multicast address %s: no Multicast support", stoa(&addr)); #endif /* MCAST */ return; } /* * io_multicast_del() - delete multicast group address */ void io_multicast_del( struct sockaddr_storage addr ) { #ifdef MCAST struct interface *interface; isc_boolean_t lstatus; /* * Check to see if this is a multicast address */ if (addr_ismulticast(&addr) == ISC_FALSE) { netsyslog(LOG_ERR, "invalid multicast address %s", stoa(&addr)); return; } switch (addr.ss_family) { case AF_INET : /* * Disable reception of multicast packets */ interface = find_flagged_addr_in_list(&addr, INT_MCASTOPEN); while ( interface != NULL) { lstatus = socket_multicast_disable(interface, &addr); interface = find_flagged_addr_in_list(&addr, INT_MCASTOPEN); } break; #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT case AF_INET6 : /* * Disable reception of multicast packets */ for (interface = ISC_LIST_HEAD(inter_list); interface != NULL; interface = ISC_LIST_NEXT(interface, link)) { if (interface->flags & INT_WILDCARD) continue; /* Be sure it's the correct family */ if (interface->sin.ss_family != AF_INET6) continue; if (!(interface->flags & INT_MCASTOPEN)) continue; if (!(interface->fd < 0)) continue; if (!SOCKCMP(&addr, &interface->sin)) continue; lstatus = socket_multicast_disable(interface, &addr); } break; #endif /* INCLUDE_IPV6_MULTICAST_SUPPORT */ }/* switch */ delete_addr_from_list(&addr); #else /* not MCAST */ netsyslog(LOG_ERR, "this function requires multicast kernel"); #endif /* not MCAST */ } /* * init_nonblocking_io() - set up descriptor to be non blocking */ static void init_nonblocking_io(SOCKET fd) { /* * set non-blocking, */ #ifdef USE_FIONBIO /* in vxWorks we use FIONBIO, but the others are defined for old systems, so * all hell breaks loose if we leave them defined */ #undef O_NONBLOCK #undef FNDELAY #undef O_NDELAY #endif #if defined(O_NONBLOCK) /* POSIX */ if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { netsyslog(LOG_ERR, "fcntl(O_NONBLOCK) fails on fd #%d: %m", fd); exit(1); /*NOTREACHED*/ } #elif defined(FNDELAY) if (fcntl(fd, F_SETFL, FNDELAY) < 0) { netsyslog(LOG_ERR, "fcntl(FNDELAY) fails on fd #%d: %m", fd); exit(1); /*NOTREACHED*/ } #elif defined(O_NDELAY) /* generally the same as FNDELAY */ if (fcntl(fd, F_SETFL, O_NDELAY) < 0) { netsyslog(LOG_ERR, "fcntl(O_NDELAY) fails on fd #%d: %m", fd); exit(1); /*NOTREACHED*/ } #elif defined(FIONBIO) { int on = 1; if (ioctl(fd,FIONBIO,&on) < 0) { netsyslog(LOG_ERR, "ioctl(FIONBIO) fails on fd #%d: %m", fd); exit(1); /*NOTREACHED*/ } } #elif defined(FIOSNBIO) if (ioctl(fd,FIOSNBIO,&on) < 0) { netsyslog(LOG_ERR, "ioctl(FIOSNBIO) fails on fd #%d: %m", fd); exit(1); /*NOTREACHED*/ } #else # include "Bletch: Need non-blocking I/O!" #endif } /* * open_socket - open a socket, returning the file descriptor */ static SOCKET open_socket( struct sockaddr_storage *addr, int flags, int turn_off_reuse, struct interface *interf ) { int errval; SOCKET fd; /* * int is OK for REUSEADR per * http://www.kohala.com/start/mcast.api.txt */ int on = 1; int off = 0; #if defined(IPTOS_LOWDELAY) && defined(IPPROTO_IP) && defined(IP_TOS) int tos; #endif /* IPTOS_LOWDELAY && IPPROTO_IP && IP_TOS */ if ((addr->ss_family == AF_INET6) && (isc_net_probeipv6() != ISC_R_SUCCESS)) return (INVALID_SOCKET); /* create a datagram (UDP) socket */ fd = socket(addr->ss_family, SOCK_DGRAM, 0); if (INVALID_SOCKET == fd) { #ifndef SYS_WINNT errval = errno; #else errval = WSAGetLastError(); #endif netsyslog(LOG_ERR, "socket(AF_INET%s, SOCK_DGRAM, 0) failed on address %s: %m", (addr->ss_family == AF_INET6) ? "6" : "", stoa(addr)); if (errval == EPROTONOSUPPORT || errval == EAFNOSUPPORT || errval == EPFNOSUPPORT) return (INVALID_SOCKET); msyslog(LOG_ERR, "unexpected error code %d (not PROTONOSUPPORT|AFNOSUPPORT|FPNOSUPPORT) - exiting", errval); exit(1); /*NOTREACHED*/ } #ifdef SYS_WINNT connection_reset_fix(fd, addr); #endif /* * Fixup the file descriptor for some systems * See bug #530 for details of the issue. */ fd = move_fd(fd); /* * set SO_REUSEADDR since we will be binding the same port * number on each interface according to turn_off_reuse. * This is undesirable on Windows versions starting with * Windows XP (numeric version 5.1). */ #ifdef SYS_WINNT if (isc_win32os_versioncheck(5, 1, 0, 0) < 0) /* before 5.1 */ #endif if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)(turn_off_reuse ? &off : &on), sizeof(on))) { netsyslog(LOG_ERR, "setsockopt SO_REUSEADDR %s" " fails for address %s: %m", turn_off_reuse ? "off" : "on", stoa(addr)); closesocket(fd); return INVALID_SOCKET; } #ifdef SO_EXCLUSIVEADDRUSE /* * setting SO_EXCLUSIVEADDRUSE on the wildcard we open * first will cause more specific binds to fail. */ if (!(interf->flags & INT_WILDCARD)) set_excladdruse(fd); #endif /* * IPv4 specific options go here */ if (addr->ss_family == AF_INET) { #if defined(IPTOS_LOWDELAY) && defined(IPPROTO_IP) && defined(IP_TOS) /* set IP_TOS to minimize packet delay */ tos = IPTOS_LOWDELAY; if (setsockopt(fd, IPPROTO_IP, IP_TOS, (char *) &tos, sizeof(tos)) < 0) { netsyslog(LOG_ERR, "setsockopt IPTOS_LOWDELAY on fails on address %s: %m", stoa(addr)); } #endif /* IPTOS_LOWDELAY && IPPROTO_IP && IP_TOS */ } /* * IPv6 specific options go here */ if (addr->ss_family == AF_INET6) { #if defined(IPV6_V6ONLY) if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&on, sizeof(on))) { netsyslog(LOG_ERR, "setsockopt IPV6_V6ONLY on fails on address %s: %m", stoa(addr)); } #endif /* IPV6_V6ONLY */ #if defined(IPV6_BINDV6ONLY) if (setsockopt(fd, IPPROTO_IPV6, IPV6_BINDV6ONLY, (char*)&on, sizeof(on))) { netsyslog(LOG_ERR, "setsockopt IPV6_BINDV6ONLY on fails on address %s: %m", stoa(addr)); } #endif /* IPV6_BINDV6ONLY */ } #ifdef OS_NEEDS_REUSEADDR_FOR_IFADDRBIND /* * some OSes don't allow binding to more specific * addresses if a wildcard address already bound * to the port and SO_REUSEADDR is not set */ if (!is_wildcard_addr(addr)) { set_wildcard_reuse(addr->ss_family, 1); } #endif /* * bind the local address. */ errval = bind(fd, (struct sockaddr *)addr, SOCKLEN(addr)); #ifdef OS_NEEDS_REUSEADDR_FOR_IFADDRBIND /* * some OSes don't allow binding to more specific * addresses if a wildcard address already bound * to the port and REUSE_ADDR is not set */ if (!is_wildcard_addr(addr)) { set_wildcard_reuse(addr->ss_family, 0); } #endif if (errval < 0) { /* * Don't log this under all conditions */ if (turn_off_reuse == 0 #ifdef DEBUG || debug > 1 #endif ) { if (addr->ss_family == AF_INET) netsyslog(LOG_ERR, "bind() fd %d, family AF_INET, port %d, addr %s, in_classd=%d flags=0x%x fails: %m", fd, (int)ntohs(((struct sockaddr_in*)addr)->sin_port), stoa(addr), IN_CLASSD(ntohl(((struct sockaddr_in*)addr)->sin_addr.s_addr)), flags); #ifdef INCLUDE_IPV6_SUPPORT else if (addr->ss_family == AF_INET6) netsyslog(LOG_ERR, "bind() fd %d, family AF_INET6, port %d, scope %d, addr %s, mcast=%d flags=0x%x fails: %m", fd, (int)ntohs(((struct sockaddr_in6*)addr)->sin6_port), # ifdef ISC_PLATFORM_HAVESCOPEID ((struct sockaddr_in6*)addr)->sin6_scope_id # else -1 # endif , stoa(addr), IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6*)addr)->sin6_addr), flags); #endif } closesocket(fd); return INVALID_SOCKET; } #ifdef HAVE_TIMESTAMP { if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP, (char*)&on, sizeof(on))) { netsyslog(LOG_DEBUG, "setsockopt SO_TIMESTAMP on fails on address %s: %m", stoa(addr)); } #ifdef DEBUG else { DPRINTF(4, ("setsockopt SO_TIMESTAMP enabled on fd %d address %s\n", fd, stoa(addr))); } #endif } #endif DPRINTF(4, ("bind() fd %d, family %d, port %d, addr %s, flags=0x%x\n", fd, addr->ss_family, (int)ntohs(((struct sockaddr_in*)addr)->sin_port), stoa(addr), interf->flags)); init_nonblocking_io(fd); #ifdef HAVE_SIGNALED_IO init_socket_sig(fd); #endif /* not HAVE_SIGNALED_IO */ add_fd_to_list(fd, FD_TYPE_SOCKET); #if !defined(SYS_WINNT) && !defined(VMS) DPRINTF(4, ("flags for fd %d: 0x%x\n", fd, fcntl(fd, F_GETFL, 0))); #endif /* SYS_WINNT || VMS */ #if defined (HAVE_IO_COMPLETION_PORT) /* * Add the socket to the completion port */ if (io_completion_port_add_socket(fd, interf)) { msyslog(LOG_ERR, "unable to set up io completion port - EXITING"); exit(1); } #endif return fd; } /* XXX ELIMINATE sendpkt similar in ntpq.c, ntpdc.c, ntp_io.c, ntptrace.c */ /* * sendpkt - send a packet to the specified destination. Maintain a * send error cache so that only the first consecutive error for a * destination is logged. */ void sendpkt( struct sockaddr_storage *dest, struct interface *inter, int ttl, struct pkt *pkt, int len ) { int cc, slot; /* * Send error caches. Empty slots have port == 0 * Set ERRORCACHESIZE to 0 to disable */ struct cache { u_short port; struct in_addr addr; }; #ifdef INCLUDE_IPV6_SUPPORT struct cache6 { u_short port; struct in6_addr addr; }; #endif /* INCLUDE_IPV6_SUPPORT */ #ifndef ERRORCACHESIZE #define ERRORCACHESIZE 8 #endif #if ERRORCACHESIZE > 0 static struct cache badaddrs[ERRORCACHESIZE]; #ifdef INCLUDE_IPV6_SUPPORT static struct cache6 badaddrs6[ERRORCACHESIZE]; #endif /* INCLUDE_IPV6_SUPPORT */ #else #define badaddrs ((struct cache *)0) /* Only used in empty loops! */ #ifdef INCLUDE_IPV6_SUPPORT #define badaddrs6 ((struct cache6 *)0) /* Only used in empty loops! */ #endif /* INCLUDE_IPV6_SUPPORT */ #endif #ifdef DEBUG if (debug > 1) { if (inter != NULL) { printf("%ssendpkt(fd=%d dst=%s, src=%s, ttl=%d, len=%d)\n", (ttl > 0) ? "\tMCAST\t***** " : "", inter->fd, stoa(dest), stoa(&inter->sin), ttl, len); } else { printf("%ssendpkt(dst=%s, ttl=%d, len=%d): no interface - IGNORED\n", (ttl > 0) ? "\tMCAST\t***** " : "", stoa(dest), ttl, len); } } #endif if (inter == NULL) /* unbound peer - drop request and wait for better network conditions */ return; #ifdef MCAST /* * for the moment we use the bcast option to set multicast ttl */ if (ttl > 0 && ttl != inter->last_ttl) { /* * set the multicast ttl for outgoing packets */ int rtc; switch (inter->sin.ss_family) { case AF_INET : { u_char mttl = (u_char) ttl; rtc = setsockopt(inter->fd, IPPROTO_IP, IP_MULTICAST_TTL, (const void *) &mttl, sizeof(mttl)); break; } #ifdef INCLUDE_IPV6_SUPPORT case AF_INET6 : { u_int ittl = (u_char) ttl; rtc = setsockopt(inter->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, (const void *) &ittl, sizeof(ittl)); break; } #endif /* INCLUDE_IPV6_SUPPORT */ default: /* just NOP if not supported */ rtc = 0; break; } if (rtc != 0) { netsyslog(LOG_ERR, "setsockopt IP_MULTICAST_TTL/IPV6_MULTICAST_HOPS fails on address %s: %m", stoa(&inter->sin)); } else inter->last_ttl = ttl; } #endif /* MCAST */ for (slot = ERRORCACHESIZE; --slot >= 0; ) if(dest->ss_family == AF_INET) { if (badaddrs[slot].port == ((struct sockaddr_in*)dest)->sin_port && badaddrs[slot].addr.s_addr == ((struct sockaddr_in*)dest)->sin_addr.s_addr) break; } #ifdef INCLUDE_IPV6_SUPPORT else if (dest->ss_family == AF_INET6) { if (badaddrs6[slot].port == ((struct sockaddr_in6*)dest)->sin6_port && badaddrs6[slot].addr.s6_addr == ((struct sockaddr_in6*)dest)->sin6_addr.s6_addr) break; } #endif /* INCLUDE_IPV6_SUPPORT */ #if defined(HAVE_IO_COMPLETION_PORT) cc = io_completion_port_sendto(inter, pkt, len, dest); if (cc != ERROR_SUCCESS) #else #ifdef SIM cc = srvr_rply(&ntp_node, dest, inter, pkt); #else /* SIM */ cc = sendto(inter->fd, (char *)pkt, (unsigned int)len, 0, (struct sockaddr *)dest, SOCKLEN(dest)); #endif /* SIM */ if (cc == -1) #endif { inter->notsent++; packets_notsent++; #if defined(HAVE_IO_COMPLETION_PORT) if (cc != WSAEWOULDBLOCK && cc != WSAENOBUFS && slot < 0) #else if (errno != EWOULDBLOCK && errno != ENOBUFS && slot < 0) #endif { /* * Remember this, if there's an empty slot */ switch (dest->ss_family) { case AF_INET : for (slot = ERRORCACHESIZE; --slot >= 0; ) if (badaddrs[slot].port == 0) { badaddrs[slot].port = SRCPORT(dest); badaddrs[slot].addr = ((struct sockaddr_in*)dest)->sin_addr; break; } break; #ifdef INCLUDE_IPV6_SUPPORT case AF_INET6 : for (slot = ERRORCACHESIZE; --slot >= 0; ) if (badaddrs6[slot].port == 0) { badaddrs6[slot].port = SRCPORT(dest); badaddrs6[slot].addr = ((struct sockaddr_in6*)dest)->sin6_addr; break; } break; #endif /* INCLUDE_IPV6_SUPPORT */ default: /* don't care if not supported */ break; } netsyslog(LOG_ERR, "sendto(%s) (fd=%d): %m", stoa(dest), inter->fd); } } else { inter->sent++; packets_sent++; /* * He's not bad any more */ if (slot >= 0) { netsyslog(LOG_INFO, "Connection re-established to %s", stoa(dest)); switch (dest->ss_family) { case AF_INET : badaddrs[slot].port = 0; break; #ifdef INCLUDE_IPV6_SUPPORT case AF_INET6 : badaddrs6[slot].port = 0; break; #endif /* INCLUDE_IPV6_SUPPORT */ default: /* don't care if not supported */ break; } } } } #if !defined(HAVE_IO_COMPLETION_PORT) /* * fdbits - generate ascii representation of fd_set (FAU debug support) * HFDF format - highest fd first. */ static char * fdbits( int count, fd_set *set ) { static char buffer[256]; char * buf = buffer; count = (count < 256) ? count : 255; while (count >= 0) { *buf++ = FD_ISSET(count, set) ? '#' : '-'; count--; } *buf = '\0'; return buffer; } /* * Routine to read the refclock packets for a specific interface * Return the number of bytes read. That way we know if we should * read it again or go on to the next one if no bytes returned */ static inline int read_refclock_packet(SOCKET fd, struct refclockio *rp, l_fp ts) { int i; int buflen; register struct recvbuf *rb; rb = get_free_recv_buffer(); if (rb == NULL) { /* * No buffer space available - just drop the packet */ char buf[RX_BUFF_SIZE]; buflen = read(fd, buf, sizeof buf); packets_dropped++; return (buflen); } i = (rp->datalen == 0 || rp->datalen > sizeof(rb->recv_space)) ? sizeof(rb->recv_space) : rp->datalen; buflen = read(fd, (char *)&rb->recv_space, (unsigned)i); if (buflen < 0) { if (errno != EINTR && errno != EAGAIN) { netsyslog(LOG_ERR, "clock read fd %d: %m", fd); } freerecvbuf(rb); return (buflen); } /* * Got one. Mark how and when it got here, * put it on the full list and do bookkeeping. */ rb->recv_length = buflen; rb->recv_srcclock = rp->srcclock; rb->dstadr = 0; rb->fd = fd; rb->recv_time = ts; rb->receiver = rp->clock_recv; if (rp->io_input) { /* * have direct input routine for refclocks */ if (rp->io_input(rb) == 0) { /* * data was consumed - nothing to pass up * into block input machine */ freerecvbuf(rb); return (buflen); } } add_full_recv_buffer(rb); rp->recvcount++; packets_received++; return (buflen); } #ifdef HAVE_TIMESTAMP /* * extract timestamps from control message buffer */ static l_fp fetch_timestamp(struct recvbuf *rb, struct msghdr *msghdr, l_fp ts) { #ifdef USE_TIMESTAMP_CMSG struct cmsghdr *cmsghdr; cmsghdr = CMSG_FIRSTHDR(msghdr); while (cmsghdr != NULL) { switch (cmsghdr->cmsg_type) { case SCM_TIMESTAMP: { struct timeval *tvp = (struct timeval *)CMSG_DATA(cmsghdr); double dtemp; l_fp nts; DPRINTF(4, ("fetch_timestamp: system network time stamp: %ld.%06ld\n", tvp->tv_sec, tvp->tv_usec)); nts.l_i = tvp->tv_sec + JAN_1970; dtemp = tvp->tv_usec / 1e6; /* fuzz lower bits not covered by precision */ if (sys_precision != 0) dtemp += (ntp_random() / FRAC - .5) / (1 << -sys_precision); nts.l_uf = (u_int32)(dtemp*FRAC); #ifdef DEBUG_TIMING { l_fp dts = ts; L_SUB(&dts, &nts); collect_timing(rb, "input processing delay", 1, &dts); DPRINTF(4, ("fetch_timestamp: timestamp delta: %s (incl. prec fuzz)\n", lfptoa(&dts, 9))); } #endif ts = nts; /* network time stamp */ break; } default: DPRINTF(4, ("fetch_timestamp: skipping control message 0x%x\n", cmsghdr->cmsg_type)); break; } cmsghdr = CMSG_NXTHDR(msghdr, cmsghdr); } #endif return ts; } #endif /* * Routine to read the network NTP packets for a specific interface * Return the number of bytes read. That way we know if we should * read it again or go on to the next one if no bytes returned */ static inline int read_network_packet(SOCKET fd, struct interface *itf, l_fp ts) { GETSOCKNAME_SOCKLEN_TYPE fromlen; int buflen; register struct recvbuf *rb; #ifdef HAVE_TIMESTAMP struct msghdr msghdr; struct iovec iovec; char control[TIMESTAMP_CTLMSGBUF_SIZE]; /* pick up control messages */ #endif /* * Get a buffer and read the frame. If we * haven't got a buffer, or this is received * on a disallowed socket, just dump the * packet. */ rb = get_free_recv_buffer(); if (rb == NULL || itf->ignore_packets == ISC_TRUE) { char buf[RX_BUFF_SIZE]; struct sockaddr_storage from; if (rb != NULL) freerecvbuf(rb); fromlen = sizeof(from); buflen = recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr*)&from, &fromlen); DPRINTF(4, ("%s on (%lu) fd=%d from %s\n", (itf->ignore_packets == ISC_TRUE) ? "ignore" : "drop", free_recvbuffs(), fd, stoa(&from))); if (itf->ignore_packets == ISC_TRUE) packets_ignored++; else packets_dropped++; return (buflen); } fromlen = sizeof(struct sockaddr_storage); #ifndef HAVE_TIMESTAMP rb->recv_length = recvfrom(fd, (char *)&rb->recv_space, sizeof(rb->recv_space), 0, (struct sockaddr *)&rb->recv_srcadr, &fromlen); #else iovec.iov_base = (void *)&rb->recv_space; iovec.iov_len = sizeof(rb->recv_space); msghdr.msg_name = (void *)&rb->recv_srcadr; msghdr.msg_namelen = sizeof(rb->recv_srcadr); msghdr.msg_iov = &iovec; msghdr.msg_iovlen = 1; msghdr.msg_control = (void *)&control; msghdr.msg_controllen = sizeof(control); msghdr.msg_flags = 0; rb->recv_length = recvmsg(fd, &msghdr, 0); #endif buflen = rb->recv_length; if (buflen == 0 || (buflen == -1 && (errno==EWOULDBLOCK #ifdef EAGAIN || errno==EAGAIN #endif ))) { freerecvbuf(rb); return (buflen); } else if (buflen < 0) { netsyslog(LOG_ERR, "recvfrom(%s) fd=%d: %m", stoa(&rb->recv_srcadr), fd); DPRINTF(5, ("read_network_packet: fd=%d dropped (bad recvfrom)\n", fd)); freerecvbuf(rb); return (buflen); } #ifdef DEBUG if (debug > 2) { if(rb->recv_srcadr.ss_family == AF_INET) printf("read_network_packet: fd=%d length %d from %08lx %s\n", fd, buflen, (u_long)ntohl(((struct sockaddr_in*)&rb->recv_srcadr)->sin_addr.s_addr) & 0x00000000ffffffff, stoa(&rb->recv_srcadr)); else printf("read_network_packet: fd=%d length %d from %s\n", fd, buflen, stoa(&rb->recv_srcadr)); } #endif /* * Got one. Mark how and when it got here, * put it on the full list and do bookkeeping. */ rb->dstadr = itf; rb->fd = fd; #ifdef HAVE_TIMESTAMP ts = fetch_timestamp(rb, &msghdr, ts); /* pick up a network time stamp if possible */ #endif rb->recv_time = ts; rb->receiver = receive; add_full_recv_buffer(rb); itf->received++; packets_received++; return (buflen); } /* * input_handler - receive packets asynchronously */ void input_handler( l_fp *cts ) { int buflen; int n; int doing; SOCKET fd; struct timeval tvzero; l_fp ts; /* Timestamp at BOselect() gob */ #ifdef DEBUG_TIMING l_fp ts_e; /* Timestamp at EOselect() gob */ #endif fd_set fds; int select_count = 0; struct interface *interface; #if defined(HAS_ROUTING_SOCKET) struct asyncio_reader *asyncio_reader; #endif handler_calls++; /* * If we have something to do, freeze a timestamp. * See below for the other cases (nothing (left) to do or error) */ ts = *cts; /* * Do a poll to see who has data */ fds = activefds; tvzero.tv_sec = tvzero.tv_usec = 0; n = select(maxactivefd+1, &fds, (fd_set *)0, (fd_set *)0, &tvzero); /* * If there are no packets waiting just return */ if (n < 0) { int err = errno; /* * extended FAU debugging output */ if (err != EINTR) netsyslog(LOG_ERR, "select(%d, %s, 0L, 0L, &0.0) error: %m", maxactivefd+1, fdbits(maxactivefd, &activefds)); if (err == EBADF) { int j, b; fds = activefds; for (j = 0; j <= maxactivefd; j++) if ((FD_ISSET(j, &fds) && (read(j, &b, 0) == -1))) netsyslog(LOG_ERR, "Bad file descriptor %d", j); } return; } else if (n == 0) return; ++handler_pkts; #ifdef REFCLOCK /* * Check out the reference clocks first, if any */ if (refio != NULL) { register struct refclockio *rp; for (rp = refio; rp != NULL; rp = rp->next) { fd = rp->fd; if (FD_ISSET(fd, &fds)) { do { ++select_count; buflen = read_refclock_packet(fd, rp, ts); } while (buflen > 0); } /* End if (FD_ISSET(fd, &fds)) */ } /* End for (rp = refio; rp != 0 && n > 0; rp = rp->next) */ } /* End if (refio != 0) */ #endif /* REFCLOCK */ /* * Loop through the interfaces looking for data to read. */ for (interface = ISC_LIST_TAIL(inter_list); interface != NULL; interface = ISC_LIST_PREV(interface, link)) { for (doing = 0; (doing < 2); doing++) { if (doing == 0) { fd = interface->fd; } else { if (!(interface->flags & INT_BCASTOPEN)) break; fd = interface->bfd; } if (fd < 0) continue; if (FD_ISSET(fd, &fds)) { do { ++select_count; buflen = read_network_packet(fd, interface, ts); } while (buflen > 0); } /* Check more interfaces */ } } #ifdef HAS_ROUTING_SOCKET /* * scan list of asyncio readers - currently only used for routing sockets */ asyncio_reader = ISC_LIST_TAIL(asyncio_reader_list); while (asyncio_reader != NULL) { struct asyncio_reader *next = ISC_LIST_PREV(asyncio_reader, link); if (FD_ISSET(asyncio_reader->fd, &fds)) { ++select_count; asyncio_reader->receiver(asyncio_reader); } asyncio_reader = next; } #endif /* HAS_ROUTING_SOCKET */ /* * Done everything from that select. */ /* * If nothing to do, just return. * If an error occurred, complain and return. */ if (select_count == 0) /* We really had nothing to do */ { #ifdef DEBUG if (debug) netsyslog(LOG_DEBUG, "input_handler: select() returned 0"); #endif return; } /* We've done our work */ #ifdef DEBUG_TIMING get_systime(&ts_e); /* * (ts_e - ts) is the amount of time we spent * processing this gob of file descriptors. Log * it. */ L_SUB(&ts_e, &ts); collect_timing(NULL, "input handler", 1, &ts_e); if (debug > 3) netsyslog(LOG_INFO, "input_handler: Processed a gob of fd's in %s msec", lfptoms(&ts_e, 6)); #endif /* just bail. */ return; } #endif /* * findinterface - find local interface corresponding to address */ struct interface * findinterface( struct sockaddr_storage *addr ) { struct interface *interface; interface = findlocalinterface(addr, INT_WILDCARD); if (interface == NULL) { DPRINTF(4, ("Found no interface for address %s - returning wildcard\n", stoa(addr))); return (ANY_INTERFACE_CHOOSE(addr)); } else { DPRINTF(4, ("Found interface #%d %s for address %s\n", interface->ifnum, interface->name, stoa(addr))); return (interface); } } /* * findlocalinterface - find local interface index corresponding to address * * This code attempts to find the local sending address for an outgoing * address by connecting a new socket to destinationaddress:NTP_PORT * and reading the sockname of the resulting connect. * the complicated sequence simulates the routing table lookup * for to first hop without duplicating any of the routing logic into * ntpd. preferably we would have used an API call - but its not there - * so this is the best we can do here short of duplicating to entire routing * logic in ntpd which would be a silly and really unportable thing to do. * */ static struct interface * findlocalinterface( struct sockaddr_storage *addr, int flags ) { SOCKET s; int rtn; struct sockaddr_storage saddr; GETSOCKNAME_SOCKLEN_TYPE saddrlen = SOCKLEN(addr); struct interface *iface; DPRINTF(4, ("Finding interface for addr %s in list of addresses\n", stoa(addr))); memset(&saddr, 0, sizeof(saddr)); saddr.ss_family = addr->ss_family; if(addr->ss_family == AF_INET) { memcpy(&((struct sockaddr_in*)&saddr)->sin_addr, &((struct sockaddr_in*)addr)->sin_addr, sizeof(struct in_addr)); ((struct sockaddr_in*)&saddr)->sin_port = htons(NTP_PORT); } #ifdef INCLUDE_IPV6_SUPPORT else if(addr->ss_family == AF_INET6) { memcpy(&((struct sockaddr_in6*)&saddr)->sin6_addr, &((struct sockaddr_in6*)addr)->sin6_addr, sizeof(struct in6_addr)); ((struct sockaddr_in6*)&saddr)->sin6_port = htons(NTP_PORT); # ifdef ISC_PLATFORM_HAVESCOPEID ((struct sockaddr_in6*)&saddr)->sin6_scope_id = ((struct sockaddr_in6*)addr)->sin6_scope_id; # endif } #endif s = socket(addr->ss_family, SOCK_DGRAM, 0); if (s == INVALID_SOCKET) return NULL; rtn = connect(s, (struct sockaddr *)&saddr, SOCKLEN(&saddr)); #ifndef SYS_WINNT if (rtn < 0) #else if (rtn == SOCKET_ERROR) #endif { closesocket(s); return NULL; } rtn = getsockname(s, (struct sockaddr *)&saddr, &saddrlen); closesocket(s); #ifndef SYS_WINNT if (rtn < 0) #else if (rtn == SOCKET_ERROR) #endif return NULL; DPRINTF(4, ("findlocalinterface: kernel maps %s to %s\n", stoa(addr), stoa(&saddr))); iface = getinterface(&saddr, flags); /* Don't both with ignore interfaces */ if (iface != NULL && iface->ignore_packets == ISC_TRUE) { return NULL; } else { return iface; } } /* * fetch an interface structure the matches the * address is has the given flags not set */ static struct interface * getinterface(struct sockaddr_storage *addr, int flags) { struct interface *interface = find_addr_in_list(addr); if (interface != NULL && interface->flags & flags) { return NULL; } else { return interface; } } /* * findlocalcastinterface - find local *cast interface index corresponding to address * depending on the flags passed */ static struct interface * findlocalcastinterface( struct sockaddr_storage *addr, int flags ) { struct interface *interface; struct interface *nif = NULL; #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT isc_boolean_t want_linklocal; #endif /* * see how kernel maps the mcast address */ nif = findlocalinterface(addr, 0); if (nif) { DPRINTF(2, ("findlocalcastinterface: kernel recommends interface #%d %s\n", nif->ifnum, nif->name)); return nif; } #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT want_linklocal = ISC_FALSE; if (addr_ismulticast(addr) && flags == INT_MULTICAST) { if (IN6_IS_ADDR_MC_LINKLOCAL(&((struct sockaddr_in6*)addr)->sin6_addr)) { want_linklocal = ISC_TRUE; } else if (IN6_IS_ADDR_MC_SITELOCAL(&((struct sockaddr_in6*)addr)->sin6_addr)) { want_linklocal = ISC_TRUE; } } #endif for (interface = ISC_LIST_HEAD(inter_list); interface != NULL; interface = ISC_LIST_NEXT(interface, link)) { /* use only allowed addresses */ if (interface->ignore_packets == ISC_TRUE) continue; /* Skip the loopback and wildcard addresses */ if (interface->flags & (INT_LOOPBACK|INT_WILDCARD)) continue; /* Skip if different family */ if(interface->sin.ss_family != addr->ss_family) continue; /* Is this it one of these based on flags? */ if (!(interface->flags & flags)) continue; /* for IPv6 multicast check the address for linklocal */ #ifdef INCLUDE_IPV6_MULTICAST_SUPPORT if (flags == INT_MULTICAST && interface->sin.ss_family == AF_INET6 && (IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6*)&interface->sin)->sin6_addr)) && want_linklocal == ISC_TRUE) { nif = interface; break; } /* If we want a linklocal address and this isn't it, skip */\ if (want_linklocal == ISC_TRUE) continue; #endif /* Otherwise just look for the flag */ if((interface->flags & flags)) { nif = interface; break; } } #ifdef DEBUG if (debug > 2) { if (nif) printf("findlocalcastinterface: found interface #%d %s\n", nif->ifnum, nif->name); else printf("findlocalcastinterface: no interface found for %s flags 0x%x\n", stoa(addr), flags); } #endif return (nif); } /* * findbcastinter - find broadcast interface corresponding to address */ struct interface * findbcastinter( struct sockaddr_storage *addr ) { #if !defined(MPE) && (defined(SIOCGIFCONF) || defined(SYS_WINNT)) struct interface *interface; DPRINTF(4, ("Finding broadcast/multicast interface for addr %s in list of addresses\n", stoa(addr))); interface = findlocalinterface(addr, INT_LOOPBACK|INT_WILDCARD); if (interface != NULL) { DPRINTF(4, ("Found bcast-/mcast- interface index #%d %s\n", interface->ifnum, interface->name)); return interface; } /* plan B - try to find something reasonable in our lists in case kernel lookup doesn't help */ for (interface = ISC_LIST_HEAD(inter_list); interface != NULL; interface = ISC_LIST_NEXT(interface, link)) { if (interface->flags & INT_WILDCARD) continue; /* Don't bother with ignored interfaces */ if (interface->ignore_packets == ISC_TRUE) continue; /* * First look if this is the correct family */ if(interface->sin.ss_family != addr->ss_family) continue; /* Skip the loopback addresses */ if (interface->flags & INT_LOOPBACK) continue; /* * If we are looking to match a multicast address grab it. */ if (addr_ismulticast(addr) == ISC_TRUE && interface->flags & INT_MULTICAST) { #ifdef INCLUDE_IPV6_SUPPORT if(addr->ss_family == AF_INET6) { /* Only use link-local address for link-scope mcast */ if(IN6_IS_ADDR_MC_LINKLOCAL(&((struct sockaddr_in6*)addr)->sin6_addr) && !IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6*)&interface->sin)->sin6_addr)) { continue; } } #endif break; } /* * We match only those interfaces marked as * broadcastable and either the explicit broadcast * address or the network portion of the IP address. * Sloppy. */ if(addr->ss_family == AF_INET) { if (SOCKCMP(&interface->bcast, addr)) { break; } if ((NSRCADR(&interface->sin) & NSRCADR(&interface->mask)) == (NSRCADR(addr) & NSRCADR(&interface->mask))) break; } #ifdef INCLUDE_IPV6_SUPPORT else if(addr->ss_family == AF_INET6) { if (SOCKCMP(&interface->bcast, addr)) { break; } if (SOCKCMP(netof(&interface->sin), netof(addr))) { break; } } #endif } #endif /* SIOCGIFCONF */ if (interface == NULL) { DPRINTF(4, ("No bcast interface found for %s\n", stoa(addr))); return ANY_INTERFACE_CHOOSE(addr); } else { DPRINTF(4, ("Found bcast-/mcast- interface index #%d %s\n", interface->ifnum, interface->name)); return interface; } } /* * io_clr_stats - clear I/O module statistics */ void io_clr_stats(void) { packets_dropped = 0; packets_ignored = 0; packets_received = 0; packets_sent = 0; packets_notsent = 0; handler_calls = 0; handler_pkts = 0; io_timereset = current_time; } #ifdef REFCLOCK /* * io_addclock - add a reference clock to the list and arrange that we * get SIGIO interrupts from it. */ int io_addclock( struct refclockio *rio ) { BLOCKIO(); /* * Stuff the I/O structure in the list and mark the descriptor * in use. There is a harmless (I hope) race condition here. */ rio->next = refio; # ifdef HAVE_SIGNALED_IO if (init_clock_sig(rio)) { UNBLOCKIO(); return 0; } # elif defined(HAVE_IO_COMPLETION_PORT) if (io_completion_port_add_clock_io(rio)) { UNBLOCKIO(); return 0; } # endif /* * enqueue */ refio = rio; /* * register fd */ add_fd_to_list(rio->fd, FD_TYPE_FILE); UNBLOCKIO(); return 1; } /* * io_closeclock - close the clock in the I/O structure given */ void io_closeclock( struct refclockio *rio ) { BLOCKIO(); /* * Remove structure from the list */ if (refio == rio) { refio = rio->next; } else { register struct refclockio *rp; for (rp = refio; rp != NULL; rp = rp->next) if (rp->next == rio) { rp->next = rio->next; break; } if (rp == NULL) { UNBLOCKIO(); return; } } /* * Close the descriptor. */ close_and_delete_fd_from_list(rio->fd); UNBLOCKIO(); } #endif /* REFCLOCK */ /* * On NT a SOCKET is an unsigned int so we cannot possibly keep it in * an array. So we use one of the ISC_LIST functions to hold the * socket value and use that when we want to enumerate it. */ void kill_asyncio(int startfd) { vsock_t *lsock; vsock_t *next; BLOCKIO(); lsock = ISC_LIST_HEAD(fd_list); while (lsock != NULL) { /* * careful here - list is being dismantled while * we scan it - setting next here insures that * we are able to correctly scan the list */ next = ISC_LIST_NEXT(lsock, link); /* * will remove socket from list */ close_and_delete_fd_from_list(lsock->fd); lsock = next; } UNBLOCKIO(); } /* * Add and delete functions for the list of open sockets */ static void add_fd_to_list(SOCKET fd, enum desc_type type) { vsock_t *lsock = (vsock_t *)emalloc(sizeof(vsock_t)); lsock->fd = fd; lsock->type = type; ISC_LIST_APPEND(fd_list, lsock, link); /* * I/O Completion Ports don't care about the select and FD_SET */ #ifndef HAVE_IO_COMPLETION_PORT if (fd < 0 || fd >= FD_SETSIZE) { msyslog(LOG_ERR, "Too many sockets in use, FD_SETSIZE %d exceeded", FD_SETSIZE); exit(1); } /* * keep activefds in sync */ if (fd > maxactivefd) maxactivefd = fd; FD_SET( (u_int)fd, &activefds); #endif } static void close_and_delete_fd_from_list(SOCKET fd) { vsock_t *next; vsock_t *lsock = ISC_LIST_HEAD(fd_list); while(lsock != NULL) { next = ISC_LIST_NEXT(lsock, link); if(lsock->fd == fd) { ISC_LIST_DEQUEUE_TYPE(fd_list, lsock, link, vsock_t); switch (lsock->type) { case FD_TYPE_SOCKET: #ifdef SYS_WINNT closesocket(lsock->fd); break; #endif case FD_TYPE_FILE: (void) close(lsock->fd); break; default: msyslog(LOG_ERR, "internal error - illegal descriptor type %d - EXITING", (int)lsock->type); exit(1); } free(lsock); /* * I/O Completion Ports don't care about select and fd_set */ #ifndef HAVE_IO_COMPLETION_PORT /* * remove from activefds */ FD_CLR( (u_int) fd, &activefds); if (fd == maxactivefd) { int i, newmax = 0; for (i = 0; i < maxactivefd; i++) if (FD_ISSET(i, &activefds)) newmax = i; maxactivefd = newmax; } #endif break; } lsock = next; } } static void add_addr_to_list(struct sockaddr_storage *addr, struct interface *interface){ #ifdef DEBUG if (find_addr_in_list(addr) == NULL) { #endif /* not there yet - add to list */ remaddr_t *laddr = (remaddr_t *)emalloc(sizeof(remaddr_t)); memcpy(&laddr->addr, addr, sizeof(struct sockaddr_storage)); laddr->interface = interface; ISC_LIST_APPEND(remoteaddr_list, laddr, link); DPRINTF(4, ("Added addr %s to list of addresses\n", stoa(addr))); #ifdef DEBUG } else { DPRINTF(4, ("WARNING: Attempt to add duplicate addr %s to address list\n", stoa(addr))); } #endif } static void delete_addr_from_list(struct sockaddr_storage *addr) { remaddr_t *next; remaddr_t *laddr = ISC_LIST_HEAD(remoteaddr_list); while(laddr != NULL) { next = ISC_LIST_NEXT(laddr, link); if(SOCKCMP(&laddr->addr, addr)) { ISC_LIST_DEQUEUE_TYPE(remoteaddr_list, laddr, link, remaddr_t); DPRINTF(4, ("Deleted addr %s from list of addresses\n", stoa(addr))); free(laddr); break; } laddr = next; } } static void delete_interface_from_list(struct interface *iface) { remaddr_t *next; remaddr_t *laddr = ISC_LIST_HEAD(remoteaddr_list); while(laddr != NULL) { next = ISC_LIST_NEXT(laddr, link); if (laddr->interface == iface) { ISC_LIST_DEQUEUE_TYPE(remoteaddr_list, laddr, link, remaddr_t); DPRINTF(4, ("Deleted addr %s for interface #%d %s from list of addresses\n", stoa(&laddr->addr), iface->ifnum, iface->name)); free(laddr); } laddr = next; } } static struct interface * find_addr_in_list(struct sockaddr_storage *addr) { remaddr_t *next; remaddr_t *laddr = ISC_LIST_HEAD(remoteaddr_list); DPRINTF(4, ("Searching for addr %s in list of addresses - ", stoa(addr))); while(laddr != NULL) { next = ISC_LIST_NEXT(laddr, link); if(SOCKCMP(&laddr->addr, addr)) { DPRINTF(4, ("FOUND\n")); return laddr->interface; } else laddr = next; } DPRINTF(4, ("NOT FOUND\n")); return NULL; /* Not found */ } /* * Find the given address with the associated flag in the list */ static struct interface * find_flagged_addr_in_list(struct sockaddr_storage *addr, int flag) { remaddr_t *next; remaddr_t *laddr = ISC_LIST_HEAD(remoteaddr_list); DPRINTF(4, ("Finding addr %s in list of addresses\n", stoa(addr))); while(laddr != NULL) { next = ISC_LIST_NEXT(laddr, link); if(SOCKCMP(&laddr->addr, addr) && (laddr->interface->flags & flag)) { return laddr->interface; break; } else laddr = next; } return NULL; /* Not found */ } #ifdef HAS_ROUTING_SOCKET #include #ifndef UPDATE_GRACE #define UPDATE_GRACE 2 /* wait UPDATE_GRACE seconds before scanning */ #endif static void process_routing_msgs(struct asyncio_reader *reader) { char buffer[5120]; char *p = buffer; int cnt; if (disable_dynamic_updates) { /* * discard ourselves if we are not need any more * usually happens when running unprivileged */ remove_asyncio_reader(reader); delete_asyncio_reader(reader); return; } cnt = read(reader->fd, buffer, sizeof(buffer)); if (cnt < 0) { msyslog(LOG_ERR, "i/o error on routing socket %m - disabling"); remove_asyncio_reader(reader); delete_asyncio_reader(reader); return; } /* * process routing message */ while ((p + sizeof(struct rt_msghdr)) <= (buffer + cnt)) { struct rt_msghdr *rtm; rtm = (struct rt_msghdr *)p; if (rtm->rtm_version != RTM_VERSION) { msyslog(LOG_ERR, "version mismatch on routing socket %m - disabling"); remove_asyncio_reader(reader); delete_asyncio_reader(reader); return; } switch (rtm->rtm_type) { #ifdef RTM_NEWADDR case RTM_NEWADDR: #endif #ifdef RTM_DELADDR case RTM_DELADDR: #endif #ifdef RTM_ADD case RTM_ADD: #endif #ifdef RTM_DELETE case RTM_DELETE: #endif #ifdef RTM_REDIRECT case RTM_REDIRECT: #endif #ifdef RTM_CHANGE case RTM_CHANGE: #endif #ifdef RTM_LOSING case RTM_LOSING: #endif #ifdef RTM_IFINFO case RTM_IFINFO: #endif #ifdef RTM_IFANNOUNCE case RTM_IFANNOUNCE: #endif /* * we are keen on new and deleted addresses and if an interface goes up and down or routing changes */ DPRINTF(3, ("routing message op = %d: scheduling interface update\n", rtm->rtm_type)); timer_interfacetimeout(current_time + UPDATE_GRACE); break; default: /* * the rest doesn't bother us. */ DPRINTF(4, ("routing message op = %d: ignored\n", rtm->rtm_type)); break; } p += rtm->rtm_msglen; } } /* * set up routing notifications */ static void init_async_notifications() { struct asyncio_reader *reader; int fd = socket(PF_ROUTE, SOCK_RAW, 0); if (fd >= 0) { fd = move_fd(fd); init_nonblocking_io(fd); #if defined(HAVE_SIGNALED_IO) init_socket_sig(fd); #endif /* HAVE_SIGNALED_IO */ reader = new_asyncio_reader(); reader->fd = fd; reader->receiver = process_routing_msgs; add_asyncio_reader(reader, FD_TYPE_SOCKET); msyslog(LOG_INFO, "Listening on routing socket on fd #%d for interface updates", fd); } else { msyslog(LOG_ERR, "unable to open routing socket (%m) - using polled interface update"); } } #else static void init_async_notifications() { } #endif