diff options
Diffstat (limited to 'contrib/bind/bin/named/ns_main.c')
| -rw-r--r-- | contrib/bind/bin/named/ns_main.c | 1027 |
1 files changed, 773 insertions, 254 deletions
diff --git a/contrib/bind/bin/named/ns_main.c b/contrib/bind/bin/named/ns_main.c index 194d368..1377098 100644 --- a/contrib/bind/bin/named/ns_main.c +++ b/contrib/bind/bin/named/ns_main.c @@ -1,6 +1,6 @@ #if !defined(lint) && !defined(SABER) -static char sccsid[] = "@(#)ns_main.c 4.55 (Berkeley) 7/1/91"; -static char rcsid[] = "$Id: ns_main.c,v 8.67 1998/04/28 19:17:46 halley Exp $"; +static const char sccsid[] = "@(#)ns_main.c 4.55 (Berkeley) 7/1/91"; +static const char rcsid[] = "$Id: ns_main.c,v 8.117 1999/11/08 23:01:38 vixie Exp $"; #endif /* not lint */ /* @@ -57,7 +57,7 @@ static char rcsid[] = "$Id: ns_main.c,v 8.67 1998/04/28 19:17:46 halley Exp $"; */ /* - * Portions Copyright (c) 1996, 1997 by Internet Software Consortium. + * Portions Copyright (c) 1996-1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above @@ -75,10 +75,11 @@ static char rcsid[] = "$Id: ns_main.c,v 8.67 1998/04/28 19:17:46 halley Exp $"; #if !defined(lint) && !defined(SABER) char copyright[] = -"@(#) Copyright (c) 1986, 1989, 1990 The Regents of the University of California.\n\ - portions Copyright (c) 1993 Digital Equipment Corporation\n\ - portions Copyright (c) 1995, 1996, 1997 Internet Software Consortium\n\ - All rights reserved.\n"; +"@(#) Copyright (c) 1986, 1989, 1990 The Regents of the University of California.\n" +"portions Copyright (c) 1993 Digital Equipment Corporation\n" +"portions Copyright (c) 1995-1999 Internet Software Consortium\n" +"portions Copyright (c) 1999 Check Point Software Technologies\n" +"All rights reserved.\n"; #endif /* not lint */ /* @@ -94,6 +95,7 @@ char copyright[] = #include <sys/wait.h> #include <sys/ioctl.h> #include <sys/socket.h> +#include <sys/un.h> #ifdef SVR4 /* XXX */ # include <sys/sockio.h> #else @@ -139,21 +141,32 @@ char copyright[] = /* list of interfaces */ static LIST(struct _interface) iflist; static int iflist_initialized = 0; +static int iflist_dont_rescan = 0; - -static const int drbufsize = 8 * 1024, /* UDP rcv buf size */ - dsbufsize = 16 * 1024, /* UDP snd buf size */ - sbufsize = 16 * 1024; /* TCP snd buf size */ +static const int drbufsize = 32 * 1024, /* UDP rcv buf size */ + dsbufsize = 48 * 1024, /* UDP snd buf size */ + sbufsize = 16 * 1024, /* TCP snd buf size */ + nudptrans = 20, /* #/udps per select */ + listenmax = 50; static u_int16_t nsid_state; -static int needs; +static u_int16_t *nsid_pool; /* optional query id pool */ +static u_int16_t *nsid_vtable; /* optional shuffle table */ +static u_int32_t nsid_hash_state; +static u_int16_t nsid_a1, nsid_a2, nsid_a3; +static u_int16_t nsid_c1, nsid_c2, nsid_c3; +static u_int16_t nsid_state2; +static int nsid_algorithm; + +typedef void (*handler)(void); +static int needs = 0; +static handler handlers[main_need_num]; static struct qstream *sq_add(void); static int opensocket_d(interface *), opensocket_s(interface *); static void sq_query(struct qstream *), - dq_remove(interface *), - ns_handle_needs(void); + dq_remove(interface *); static int sq_dowrite(struct qstream *); static void use_desired_debug(void); static void stream_write(evContext, void *, int, int); @@ -162,7 +175,8 @@ static interface * if_find(struct in_addr, u_int16_t port); static int sq_here(struct qstream *); -static void stream_accept(evContext, void *, int, +static void deallocate_everything(void), + stream_accept(evContext, void *, int, const void *, int, const void *, int), stream_getlen(evContext, void *, int, int), @@ -175,14 +189,20 @@ static void stream_accept(evContext, void *, int, static void stream_send(evContext, void *, int, const void *, int, const void *, int); -static void init_signals(void); -static void set_signal_handler(int, SIG_FN (*)()); static int only_digits(const char *); +static void init_needs(void), + handle_need(void); + +#ifndef HAVE_CUSTOM +static void custom_init(void), + custom_shutdown(void); +#endif + static void usage() { fprintf(stderr, -"Usage: named [-d #] [-q] [-r] [-f] [-p port] [[-b|-c] configfile]\n"); +"Usage: named [-d #] [-q] [-r] [-v] [-f] [-p port] [[-b|-c] configfile]\n"); #ifdef CAN_CHANGE_ID fprintf(stderr, " [-u (username|uid)] [-g (groupname|gid)]\n"); @@ -202,20 +222,16 @@ static char bad_directory[] = "chdir failed for directory '%s': %s"; /*ARGSUSED*/ int main(int argc, char *argv[], char *envp[]) { - int n, udpcnt; - char *arg; - struct qstream *sp; - interface *ifp; - const int on = 1; - int rfd, size, len, debug_option; - char **argp, *p; + int n; + char *p; int ch; - FILE *fp; /* file descriptor for pid file */ struct passwd *pw; struct group *gr; -#ifdef HAVE_GETRUSAGE - struct rlimit rl; + +#ifdef _AUX_SOURCE + set42sig(); #endif + debugfile = savestr(_PATH_DEBUG, 1); user_id = getuid(); group_id = getgid(); @@ -231,7 +247,17 @@ main(int argc, char *argv[], char *envp[]) { (void) umask(022); - while ((ch = getopt(argc, argv, "b:c:d:g:p:t:u:w:qrf")) != EOF) { + /* Save argv[] before getopt() destroys it -- needed for execvp(). */ + saved_argv = malloc(sizeof(char *) * (argc + 1)); + INSIST(saved_argv != NULL); + for (n = 0; n < argc; n++) { + saved_argv[n] = strdup(argv[n]); + INSIST(saved_argv[n] != NULL); + } + saved_argv[argc] = NULL; + /* XXX we need to free() this for clean shutdowns. */ + + while ((ch = getopt(argc, argv, "b:c:d:g:p:t:u:vw:qrf")) != -1) { switch (ch) { case 'b': case 'c': @@ -291,6 +317,10 @@ main(int argc, char *argv[], char *envp[]) { chroot_dir = savestr(optarg, 1); break; + case 'v': + fprintf(stderr, "%s\n", Version); + exit(1); + #ifdef CAN_CHANGE_ID case 'u': user_name = savestr(optarg, 1); @@ -390,6 +420,10 @@ main(int argc, char *argv[], char *envp[]) { /* Establish global event context. */ evCreate(&ev); + /* Establish global resolver context. */ + res_ninit(&res); + res.options &= ~(RES_DEFNAMES | RES_DNSRCH | RES_RECURSE); + /* * Set up logging. */ @@ -416,14 +450,14 @@ main(int argc, char *argv[], char *envp[]) { use_desired_debug(); #endif + /* Perform system-dependent initialization */ + custom_init(); + + init_needs(); init_signals(); ns_notice(ns_log_default, "starting. %s", Version); - _res.options &= ~(RES_DEFNAMES | RES_DNSRCH | RES_RECURSE); - - nsid_init(); - /* * Initialize and load database. */ @@ -434,6 +468,8 @@ main(int argc, char *argv[], char *envp[]) { time(&boottime); resettime = boottime; + nsid_init(); + /* * Fork and go into background now that * we've done any slow initialization @@ -477,21 +513,46 @@ main(int argc, char *argv[], char *envp[]) { ns_panic(ns_log_security, 1, "setuid(%s): %s", user_name, strerror(errno)); ns_info(ns_log_security, "user = %s", user_name); + if (user_id != 0) + iflist_dont_rescan++; } #endif /* CAN_CHANGE_ID */ ns_notice(ns_log_default, "Ready to answer queries."); gettime(&tt); prime_cache(); - for (;;) { + while (!main_needs_exit) { evEvent event; - if (needs) - ns_handle_needs(); - INSIST_ERR(evGetNext(ev, &event, EV_WAIT) != -1); - INSIST_ERR(evDispatch(ev, event) != -1); + ns_debug(ns_log_default, 15, "main loop"); + if (needs != 0) { + /* Drain outstanding events; handlers ~block~. */ + while (evGetNext(ev, &event, EV_POLL) != -1) + INSIST_ERR(evDispatch(ev, event) != -1); + INSIST_ERR(errno == EINTR || errno == EWOULDBLOCK); + handle_need(); + } else if (evGetNext(ev, &event, EV_WAIT) != -1) { + INSIST_ERR(evDispatch(ev, event) != -1); + } else { + INSIST_ERR(errno == EINTR); + } } - /* NOTREACHED */ + ns_info(ns_log_default, "named shutting down"); +#ifdef BIND_UPDATE + dynamic_about_to_exit(); +#endif + if (server_options && server_options->pid_filename) + (void)unlink(server_options->pid_filename); + ns_logstats(ev, NULL, evNowTime(), evConsTime(0, 0)); + + if (NS_OPTION_P(OPTION_DEALLOC_ON_EXIT)) + deallocate_everything(); + else + shutdown_configuration(); + + /* Cleanup for system-dependent stuff */ + custom_shutdown(); + return (0); } @@ -508,7 +569,7 @@ stream_accept(evContext lev, void *uap, int rfd, interface *ifp = uap; struct qstream *sp; struct iovec iov; - int n, len; + int len, n; const int on = 1; #ifdef IP_OPTIONS /* XXX */ u_char ip_opts[IP_OPT_BUF_SIZE]; @@ -594,21 +655,6 @@ stream_accept(evContext lev, void *uap, int rfd, /* Condition the socket. */ -/* XXX clean up */ -#if 0 - if ((n = fcntl(rfd, F_GETFL, 0)) == -1) { - ns_info(ns_log_default, "fcntl(rfd, F_GETFL): %s", - strerror(errno)); - (void) close(rfd); - return; - } - if (fcntl(rfd, F_SETFL, n|PORT_NONBLOCK) == -1) { - ns_info(ns_log_default, "fcntl(rfd, NONBLOCK): %s", - strerror(errno)); - (void) close(rfd); - return; - } -#endif #ifndef CANNOT_SET_SNDBUF if (setsockopt(rfd, SOL_SOCKET, SO_SNDBUF, (char*)&sbufsize, sizeof sbufsize) < 0) { @@ -626,6 +672,19 @@ stream_accept(evContext lev, void *uap, int rfd, return; } + if ((n = fcntl(rfd, F_GETFL, 0)) == -1) { + ns_info(ns_log_default, "fcntl(rfd, F_GETFL): %s", + strerror(errno)); + (void) close(rfd); + return; + } + if (fcntl(rfd, F_SETFL, n|PORT_NONBLOCK) == -1) { + ns_info(ns_log_default, "fcntl(rfd, NONBLOCK): %s", + strerror(errno)); + (void) close(rfd); + return; + } + /* * We don't like IP options. Turn them off if the connection came in * with any. log this event since it usually indicates a security @@ -685,20 +744,23 @@ tcp_send(struct qinfo *qp) { ns_debug(ns_log_default, 1, "tcp_send"); if ((sp = sq_add()) == NULL) { - return(SERVFAIL); + return (SERVFAIL); } if ((sp->s_rfd = socket(AF_INET, SOCK_STREAM, PF_UNSPEC)) == -1) { sq_remove(sp); - return(SERVFAIL); + return (SERVFAIL); + } + if (sp->s_rfd > evHighestFD(ev)) { + sq_remove(sp); + return (SERVFAIL); } - if (sq_openw(sp, qp->q_msglen + INT16SZ) == -1) { sq_remove(sp); - return(SERVFAIL); + return (SERVFAIL); } if (sq_write(sp, qp->q_msg, qp->q_msglen) == -1) { sq_remove(sp); - return(SERVFAIL); + return (SERVFAIL); } if (setsockopt(sp->s_rfd, SOL_SOCKET, SO_KEEPALIVE, @@ -711,17 +773,14 @@ tcp_send(struct qinfo *qp) { sp->s_time = tt.tv_sec; /* last transaction time */ sp->s_refcnt = 1; sp->flags |= STREAM_DONE_CLOSE; - if (qp->q_fwd) - sp->s_from = qp->q_fwd->fwdaddr; - else - sp->s_from = qp->q_addr[qp->q_curaddr].ns_addr; + sp->s_from = qp->q_addr[qp->q_curaddr].ns_addr; if (evConnect(ev, sp->s_rfd, &sp->s_from, sizeof(sp->s_from), stream_send, sp, &sp->evID_c) == -1) { sq_remove(sp); return (SERVFAIL); } sp->flags |= STREAM_CONNECT_EV; - return(NOERROR); + return (NOERROR); } static void @@ -763,7 +822,8 @@ stream_write(evContext ctx, void *uap, int fd, int evmask) { if (sp->s_wbuf) { memput(sp->s_wbuf, sp->s_wbuf_end - sp->s_wbuf); - sp->s_wbuf = NULL; + sp->s_wbuf_send = sp->s_wbuf_free = NULL; + sp->s_wbuf_end = sp->s_wbuf = NULL; } (void) evDeselectFD(ev, sp->evID_w); sp->flags &= ~STREAM_WRITE_EV; @@ -811,6 +871,13 @@ stream_getlen(evContext lev, void *uap, int fd, int bytes) { */ sp->s_size = ns_get16(sp->s_temp); ns_debug(ns_log_default, 5, "stream message: %d bytes", sp->s_size); + if (sp->s_size < HFIXEDSZ) { + ns_error(ns_log_default, + "stream_getlen(%s): request too small", + sin_ntoa(sp->s_from)); + sq_remove(sp); + return; + } if (!(sp->flags & STREAM_MALLOC)) { sp->s_bufsize = 64*1024-1; /* maximum tcp message size */ @@ -834,7 +901,6 @@ stream_getlen(evContext lev, void *uap, int fd, int bytes) { static void stream_getmsg(evContext lev, void *uap, int fd, int bytes) { struct qstream *sp = uap; - int buflen, n; sp->flags &= ~STREAM_READ_EV; if (bytes == -1) { @@ -847,10 +913,12 @@ stream_getmsg(evContext lev, void *uap, int fd, int bytes) { gettime(&tt); sp->s_time = tt.tv_sec; - ns_debug(ns_log_default, 5, "sp %#x rfd %d size %d time %d next %#x", - sp, sp->s_rfd, sp->s_size, sp->s_time, sp->s_next); - ns_debug(ns_log_default, 5, "\tbufsize %d bytes %d", sp->s_bufsize, - bytes); + if (ns_wouldlog(ns_log_default,5)) { + ns_debug(ns_log_default, 5, "sp %#x rfd %d size %d time %d next %#x", + sp, sp->s_rfd, sp->s_size, sp->s_time, sp->s_next); + ns_debug(ns_log_default, 5, "\tbufsize %d bytes %d", sp->s_bufsize, + bytes); + } /* * Do we have enough memory for the query? If not, and if we have a @@ -882,12 +950,16 @@ datagram_read(evContext lev, void *uap, int fd, int evmask) { interface *ifp = uap; struct sockaddr_in from; int from_len = sizeof from; - int n; + int n, nudp; union { HEADER h; /* Force alignment of 'buf'. */ u_char buf[PACKETSZ+1]; } u; + tt = evTimeVal(evNowTime()); + nudp = 0; + + more: n = recvfrom(fd, (char *)u.buf, sizeof u.buf, 0, (struct sockaddr *)&from, &from_len); @@ -911,15 +983,6 @@ datagram_read(evContext lev, void *uap, int fd, int evmask) { * ignore them. */ return; - case EBADF: - case ENOTCONN: - case ENOTSOCK: - case EFAULT: - /* - * If one these happens, we're broken. - */ - ns_panic(ns_log_default, 1, "recvfrom: %s", - strerror(errno)); default: /* * An error we don't expect. Log it and press @@ -931,14 +994,14 @@ datagram_read(evContext lev, void *uap, int fd, int evmask) { } } -#ifndef BSD /* Handle bogosity on systems that need it. */ if (n == 0) return; -#endif - ns_debug(ns_log_default, 1, "datagram from %s, fd %d, len %d", - sin_ntoa(from), fd, n); + if (ns_wouldlog(ns_log_default, 1)) { + ns_debug(ns_log_default, 1, "datagram from %s, fd %d, len %d", + sin_ntoa(from), fd, n); + } if (n > PACKETSZ) { /* @@ -949,8 +1012,9 @@ datagram_read(evContext lev, void *uap, int fd, int evmask) { ns_debug(ns_log_default, 1, "truncated oversize UDP packet"); } - gettime(&tt); /* Keep 'tt' current. */ dispatch_message(u.buf, n, PACKETSZ, NULL, from, fd, ifp); + if (++nudp < nudptrans) + goto more; } static void @@ -961,8 +1025,35 @@ dispatch_message(u_char *msg, int msglen, int buflen, struct qstream *qsp, if (msglen < HFIXEDSZ) { ns_debug(ns_log_default, 1, "dropping undersize message"); + if (qsp) { + qsp->flags |= STREAM_DONE_CLOSE; + sq_done(qsp); + } return; } + + if (server_options->blackhole_acl != NULL && + ip_match_address(server_options->blackhole_acl, + from.sin_addr) == 1) { + ns_debug(ns_log_default, 1, + "dropping blackholed %s from %s", + hp->qr ? "response" : "query", + sin_ntoa(from)); + if (qsp) { + qsp->flags |= STREAM_DONE_CLOSE; + sq_done(qsp); + } + return; + } + + /* Drop UDP packets from port zero. They are invariable forged. */ + if (qsp == NULL && ntohs(from.sin_port) == 0) { + ns_notice(ns_log_security, + "dropping source port zero packet from %s", + sin_ntoa(from)); + return; + } + if (hp->qr) { ns_resp(msg, msglen, from, qsp); if (qsp) @@ -976,6 +1067,10 @@ dispatch_message(u_char *msg, int msglen, int buflen, struct qstream *qsp, ns_notice(ns_log_security, "refused query on non-query socket from %s", sin_ntoa(from)); + if (qsp) { + qsp->flags |= STREAM_DONE_CLOSE; + sq_done(qsp); + } /* XXX Send refusal here. */ } } @@ -986,17 +1081,24 @@ getnetconf(int periodic_scan) { struct ifreq ifreq; struct in_addr ina; interface *ifp; - char buf[32768], *cp, *cplim; - u_int32_t nm; + char *buf, *cp, *cplim; + static int bufsiz = 4095; time_t my_generation = time(NULL); - int s, cpsize; + int s, cpsize, n; int found; listen_info li; - u_int16_t port; ip_match_element ime; u_char *mask_ptr; struct in_addr mask; + if (iflist_initialized) { + if (iflist_dont_rescan) + return; + } else { + INIT_LIST(iflist); + iflist_initialized = 1; + } + ns_debug(ns_log_default, 1, "getnetconf(generation %lu)", (u_long)my_generation); @@ -1010,11 +1112,6 @@ getnetconf(int periodic_scan) { return; } - if (!iflist_initialized) { - INIT_LIST(iflist); - iflist_initialized = 1; - } - if (local_addresses != NULL) free_ip_match_list(local_addresses); local_addresses = new_ip_match_list(); @@ -1022,11 +1119,46 @@ getnetconf(int periodic_scan) { free_ip_match_list(local_networks); local_networks = new_ip_match_list(); - ifc.ifc_len = sizeof buf; - ifc.ifc_buf = buf; - if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) - ns_panic(ns_log_default, 1, "get interface configuration: %s", - strerror(errno)); + for (;;) { + buf = memget(bufsiz); + if (!buf) + ns_panic(ns_log_default, 1, + "memget(interface)", NULL); + ifc.ifc_len = bufsiz; + ifc.ifc_buf = buf; +#ifdef IRIX_EMUL_IOCTL_SIOCGIFCONF + /* + * This is a fix for IRIX OS in which the call to ioctl with + * the flag SIOCGIFCONF may not return an entry for all the + * interfaces like most flavors of Unix. + */ + if (emul_ioctl(&ifc) >= 0) + break; +#else + if ((n = ioctl(s, SIOCGIFCONF, (char *)&ifc)) != -1) { + /* + * Some OS's just return what will fit rather + * than set EINVAL if the buffer is too small + * to fit all the interfaces in. If + * ifc.ifc_len is too near to the end of the + * buffer we will grow it just in case and + * retry. + */ + if (ifc.ifc_len + 2 * sizeof(ifreq) < bufsiz) + break; + } +#endif + if ((n == -1) && errno != EINVAL) + ns_panic(ns_log_default, 1, + "get interface configuration: %s", + strerror(errno)); + + if (bufsiz > 1000000) + ns_panic(ns_log_default, 1, + "get interface configuration: maximum buffer size exceeded"); + memput(buf, bufsiz); + bufsiz += 4096; + } ns_debug(ns_log_default, 2, "getnetconf: SIOCGIFCONF: ifc_len = %d", ifc.ifc_len); @@ -1035,7 +1167,7 @@ getnetconf(int periodic_scan) { cplim = buf + ifc.ifc_len; /* skip over if's with big ifr_addr's */ for (cp = buf; cp < cplim; cp += cpsize) { memcpy(&ifreq, cp, sizeof ifreq); -#if defined HAVE_SA_LEN +#ifdef HAVE_SA_LEN #ifdef FIX_ZERO_SA_LEN if (ifreq.ifr_addr.sa_len == 0) ifreq.ifr_addr.sa_len = 16; @@ -1228,6 +1360,7 @@ getnetconf(int periodic_scan) { } } close(s); + memput(buf, bufsiz); ns_debug(ns_log_default, 7, "local addresses:"); dprint_ip_match_list(ns_log_default, local_addresses, 2, "", ""); @@ -1270,6 +1403,23 @@ opensocket_d(interface *ifp) { strerror(errno)); return (-1); } + if (ifp->dfd > evHighestFD(ev)) { + ns_error(ns_log_default, "socket too high: %d", ifp->dfd); + close(ifp->dfd); + return (-1); + } + if ((n = fcntl(ifp->dfd, F_GETFL, 0)) == -1) { + ns_info(ns_log_default, "fcntl(ifp->dfd, F_GETFL): %s", + strerror(errno)); + (void) close(ifp->dfd); + return (-1); + } + if (fcntl(ifp->dfd, F_SETFL, n|PORT_NONBLOCK) == -1) { + ns_info(ns_log_default, "fcntl(ifp->dfd, NONBLOCK): %s", + strerror(errno)); + (void) close(ifp->dfd); + return (-1); + } #ifdef F_DUPFD /* XXX */ /* * Leave a space for stdio to work in. @@ -1350,6 +1500,11 @@ opensocket_s(interface *ifp) { strerror(errno)); return (-1); } + if (ifp->sfd > evHighestFD(ev)) { + ns_error(ns_log_default, "socket too high: %d", ifp->sfd); + close(ifp->sfd); + return (-1); + } #ifdef F_DUPFD /* XXX */ /* * Leave a space for stdio to work in. @@ -1386,7 +1541,7 @@ opensocket_s(interface *ifp) { sleep(30); goto again; } - if (evListen(ev, ifp->sfd, 5/*XXX*/, stream_accept, ifp, &ifp->evID_s) + if (evListen(ev, ifp->sfd, listenmax, stream_accept, ifp, &ifp->evID_s) == -1) { ns_error(ns_log_default, "evListen(sfd=%d): %s", ifp->sfd, strerror(errno)); @@ -1460,6 +1615,8 @@ opensocket_f() { if ((ds = socket(AF_INET, SOCK_DGRAM, 0)) < 0) ns_panic(ns_log_default, 1, "socket(SOCK_DGRAM): %s", strerror(errno)); + if (ds > evHighestFD(ev)) + ns_panic(ns_log_default, 1, "socket too high: %d", ds); if (setsockopt(ds, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof on) != 0) { ns_notice(ns_log_default, "setsockopt(REUSEADDR): %s", @@ -1468,7 +1625,7 @@ opensocket_f() { } if (bind(ds, (struct sockaddr *)&server_options->query_source, sizeof server_options->query_source) < 0) - ns_panic(ns_log_default, 1, "opensocket_f: bind(%s): %s", + ns_panic(ns_log_default, 0, "opensocket_f: bind(%s): %s", sin_ntoa(server_options->query_source), strerror(errno)); @@ -1513,56 +1670,6 @@ setdebug(int new_debug) { #endif } -static SIG_FN -onhup(int sig) { - ns_need(MAIN_NEED_RELOAD); -} - -static SIG_FN -onintr(int sig) { - ns_need(MAIN_NEED_EXIT); -} - -static SIG_FN -setdumpflg(int sig) { - ns_need(MAIN_NEED_DUMP); -} - -#ifdef DEBUG -static SIG_FN -setIncrDbgFlg(int sig) { - desired_debug++; - ns_need(MAIN_NEED_DEBUG); -} - -static SIG_FN -setNoDbgFlg(int sig) { - desired_debug = 0; - ns_need(MAIN_NEED_DEBUG); -} -#endif /*DEBUG*/ - -#if defined(QRYLOG) && defined(SIGWINCH) -static SIG_FN -setQrylogFlg(int sig) { - ns_need(MAIN_NEED_QRYLOG); -} -#endif /*QRYLOG && SIGWINCH*/ - -static SIG_FN -setstatsflg(int sig) { - ns_need(MAIN_NEED_STATSDUMP); -} - -static SIG_FN -discard_pipe(int sig) { -#ifdef SIGPIPE_ONE_SHOT - int saved_errno = errno; - set_signal_handler(SIGPIPE, discard_pipe); - errno = saved_errno; -#endif -} - /* ** Routines for managing stream queue */ @@ -1601,7 +1708,8 @@ sq_remove(struct qstream *qp) { if (qp->s_wbuf != NULL) { memput(qp->s_wbuf, qp->s_wbuf_end - qp->s_wbuf); - qp->s_wbuf = NULL; + qp->s_wbuf_send = qp->s_wbuf_free = NULL; + qp->s_wbuf_end = qp->s_wbuf = NULL; } if (qp->flags & STREAM_MALLOC) memput(qp->s_buf, qp->s_bufsize); @@ -1655,7 +1763,7 @@ sq_flush(struct qstream *allbut) { */ int sq_openw(struct qstream *qs, int buflen) { -#ifdef SO_LINGER /* XXX */ +#ifdef DO_SO_LINGER /* XXX */ static const struct linger ll = { 1, 120 }; #endif @@ -1666,7 +1774,7 @@ sq_openw(struct qstream *qs, int buflen) { qs->s_wbuf_send = qs->s_wbuf; qs->s_wbuf_free = qs->s_wbuf; qs->s_wbuf_end = qs->s_wbuf + buflen; -#ifdef SO_LINGER /* XXX */ +#ifdef DO_SO_LINGER /* XXX */ /* kernels that map pages for IO end up failing if the pipe is full * at exit and we take away the final buffer. this is really a kernel * bug but it's harmless on systems that are not broken, so... @@ -1685,6 +1793,7 @@ sq_dowrite(struct qstream *qs) { if (qs->s_wbuf_free > qs->s_wbuf_send) { int n = write(qs->s_rfd, qs->s_wbuf_send, qs->s_wbuf_free - qs->s_wbuf_send); + INSIST(qs->s_wbuf != NULL); if (n < 0) { if (errno != EINTR && errno != EAGAIN #if (EWOULDBLOCK != EAGAIN) @@ -1831,8 +1940,10 @@ sq_done(struct qstream *sp) { struct iovec iov; if (sp->s_wbuf != NULL) { + INSIST(sp->s_wbuf_send == sp->s_wbuf_free); memput(sp->s_wbuf, sp->s_wbuf_end - sp->s_wbuf); - sp->s_wbuf = NULL; + sp->s_wbuf_send = sp->s_wbuf_free = NULL; + sp->s_wbuf_end = sp->s_wbuf = NULL; } if (sp->flags & STREAM_AXFR) ns_freexfr(sp); @@ -1950,7 +2061,6 @@ net_mask(struct in_addr ina) { */ int aIsUs(struct in_addr addr) { - interface *ifp; if (ina_hlong(addr) == INADDR_ANY || if_find(addr, 0) != NULL) return (1); @@ -1982,22 +2092,397 @@ if_find(struct in_addr addr, u_int16_t port) { * allocation scheme to make it a little harder to predict them. Note * that the resolver will need the same protection so the cleverness * should be put there rather than here; this is just an interface layer. + * + * This is true but ... most clients only send out a few queries, they + * use varying port numbers, and the queries aren't sent to the outside + * world which we know is full of spoofers. Doing a good job of randomizing + * ids may also be to expensive for each client. Queries forwarded by the + * server always come from the same port (unless you let 8.x pick a port + * and restart it periodically - maybe it should open several and use + * them randomly). The server sends out lots more queries, and if it's + * cache is corrupted, it has the potential to affect more clients. + * NOTE: - randomizing the ID or source port doesn't help a bit if the + * queries can be sniffed. + * -- DL + */ + +/* + * Allow the user to pick one of two ID randomization algorithms. + * + * The first algorithm is an adaptation of the sequence shuffling + * algorithm discovered by Carter Bays and S. D. Durham [ACM Trans. Math. + * Software 2 (1976), 59-64], as documented as Algorithm B in Chapter + * 3.2.2 in Volume 2 of Knuth's "The Art of Computer Programming". We use + * a randomly selected linear congruential random number generator with a + * modulus of 2^16, whose increment is a randomly picked odd number, and + * whose multiplier is picked from a set which meets the following + * criteria: + * Is of the form 8*n+5, which ensures "high potency" according to + * principle iii in the summary chapter 3.6. This form also has a + * gcd(a-1,m) of 4 which is good according to principle iv. + * + * Is between 0.01 and 0.99 times the modulus as specified by + * principle iv. + * + * Passes the spectral test "with flying colors" (ut >= 1) in + * dimensions 2 through 6 as calculated by Algorithm S in Chapter + * 3.3.4 and the ratings calculated by formula 35 in section E. + * + * Of the multipliers that pass this test, pick the set that is + * best according to the theoretical bounds of the serial + * correlation test. This was calculated using a simplified + * version of Knuth's Theorem K in Chapter 3.3.3. + * + * These criteria may not be important for this use, but we might as well + * pick from the best generators since there are so many possible ones and + * we don't have that many random bits to do the picking. + * + * We use a modulus of 2^16 instead of something bigger so that we will + * tend to cycle through all the possible IDs before repeating any, + * however the shuffling will perturb this somewhat. Theoretically there + * is no minimimum interval between two uses of the same ID, but in + * practice it seems to be >64000. + * + * Our adaptatation of Algorithm B mixes the hash state which has + * captured various random events into the shuffler to perturb the + * sequence. + * + * One disadvantage of this algorithm is that if the generator parameters + * were to be guessed, it would be possible to mount a limited brute force + * attack on the ID space since the IDs are only shuffled within a limited + * range. + * + * The second algorithm uses the same random number generator to populate + * a pool of 65536 IDs. The hash state is used to pick an ID from a window + * of 4096 IDs in this pool, then the chosen ID is swapped with the ID + * at the beginning of the window and the window position is advanced. + * This means that the interval between uses of the ID will be no less + * than 65536-4096. The ID sequence in the pool will become more random + * over time. + * + * For both algorithms, two more linear congruential random number generators + * are selected. The ID from the first part of algorithm is used to seed + * the first of these generators, and its output is used to seed the second. + * The strategy is use these generators as 1 to 1 hashes to obfuscate the + * properties of the generator used in the first part of either algorithm. + * + * The first algorithm may be suitable for use in a client resolver since + * its memory requirements are fairly low and it's pretty random out of + * the box. It is somewhat succeptible to a limited brute force attack, + * so the second algorithm is probably preferable for a longer running + * program that issues a large number of queries and has time to randomize + * the pool. + */ + +#define NSID_SHUFFLE_TABLE_SIZE 100 /* Suggested by Knuth */ +/* + * Pick one of the next 4096 IDs in the pool. + * There is a tradeoff here between randomness and how often and ID is reused. + */ +#define NSID_LOOKAHEAD 4096 /* Must be a power of 2 */ +#define NSID_SHUFFLE_ONLY 1 /* algorithm 1 */ +#define NSID_USE_POOL 2 /* algorithm 2 */ + +/* + * Keep a running hash of various bits of data that we'll use to + * stir the ID pool or perturb the ID generator + */ +void +nsid_hash(u_char *data, size_t len) { + /* + * Hash function similar to the one we use for hashing names. + * We don't fold case or toss the upper bit here, though. + * This hash doesn't do much interesting when fed binary zeros, + * so there may be a better hash function. + * This function doesn't need to be very strong since we're + * only using it to stir the pool, but it should be reasonably + * fast. + */ + while (len-- > 0) { + HASHROTATE(nsid_hash_state); + nsid_hash_state += *data++; + } +} + +/* + * Table of good linear congruential multipliers for modulus 2^16 + * in order of increasing serial correlation bounds (so trim from + * the end). */ +static const u_int16_t nsid_multiplier_table[] = { + 17565, 25013, 11733, 19877, 23989, 23997, 24997, 25421, + 26781, 27413, 35901, 35917, 35973, 36229, 38317, 38437, + 39941, 40493, 41853, 46317, 50581, 51429, 53453, 53805, + 11317, 11789, 12045, 12413, 14277, 14821, 14917, 18989, + 19821, 23005, 23533, 23573, 23693, 27549, 27709, 28461, + 29365, 35605, 37693, 37757, 38309, 41285, 45261, 47061, + 47269, 48133, 48597, 50277, 50717, 50757, 50805, 51341, + 51413, 51581, 51597, 53445, 11493, 14229, 20365, 20653, + 23485, 25541, 27429, 29421, 30173, 35445, 35653, 36789, + 36797, 37109, 37157, 37669, 38661, 39773, 40397, 41837, + 41877, 45293, 47277, 47845, 49853, 51085, 51349, 54085, + 56933, 8877, 8973, 9885, 11365, 11813, 13581, 13589, + 13613, 14109, 14317, 15765, 15789, 16925, 17069, 17205, + 17621, 17941, 19077, 19381, 20245, 22845, 23733, 24869, + 25453, 27213, 28381, 28965, 29245, 29997, 30733, 30901, + 34877, 35485, 35613, 36133, 36661, 36917, 38597, 40285, + 40693, 41413, 41541, 41637, 42053, 42349, 45245, 45469, + 46493, 48205, 48613, 50861, 51861, 52877, 53933, 54397, + 55669, 56453, 56965, 58021, 7757, 7781, 8333, 9661, + 12229, 14373, 14453, 17549, 18141, 19085, 20773, 23701, + 24205, 24333, 25261, 25317, 27181, 30117, 30477, 34757, + 34885, 35565, 35885, 36541, 37957, 39733, 39813, 41157, + 41893, 42317, 46621, 48117, 48181, 49525, 55261, 55389, + 56845, 7045, 7749, 7965, 8469, 9133, 9549, 9789, + 10173, 11181, 11285, 12253, 13453, 13533, 13757, 14477, + 15053, 16901, 17213, 17269, 17525, 17629, 18605, 19013, + 19829, 19933, 20069, 20093, 23261, 23333, 24949, 25309, + 27613, 28453, 28709, 29301, 29541, 34165, 34413, 37301, + 37773, 38045, 38405, 41077, 41781, 41925, 42717, 44437, + 44525, 44613, 45933, 45941, 47077, 50077, 50893, 52117, + 5293, 55069, 55989, 58125, 59205, 6869, 14685, 15453, + 16821, 17045, 17613, 18437, 21029, 22773, 22909, 25445, + 25757, 26541, 30709, 30909, 31093, 31149, 37069, 37725, + 37925, 38949, 39637, 39701, 40765, 40861, 42965, 44813, + 45077, 45733, 47045, 50093, 52861, 52957, 54181, 56325, + 56365, 56381, 56877, 57013, 5741, 58101, 58669, 8613, + 10045, 10261, 10653, 10733, 11461, 12261, 14069, 15877, + 17757, 21165, 23885, 24701, 26429, 26645, 27925, 28765, + 29197, 30189, 31293, 39781, 39909, 40365, 41229, 41453, + 41653, 42165, 42365, 47421, 48029, 48085, 52773, 5573, + 57037, 57637, 58341, 58357, 58901, 6357, 7789, 9093, + 10125, 10709, 10765, 11957, 12469, 13437, 13509, 14773, + 15437, 15773, 17813, 18829, 19565, 20237, 23461, 23685, + 23725, 23941, 24877, 25461, 26405, 29509, 30285, 35181, + 37229, 37893, 38565, 40293, 44189, 44581, 45701, 47381, + 47589, 48557, 4941, 51069, 5165, 52797, 53149, 5341, + 56301, 56765, 58581, 59493, 59677, 6085, 6349, 8293, + 8501, 8517, 11597, 11709, 12589, 12693, 13517, 14909, + 17397, 18085, 21101, 21269, 22717, 25237, 25661, 29189, + 30101, 31397, 33933, 34213, 34661, 35533, 36493, 37309, + 40037, 4189, 42909, 44309, 44357, 44389, 4541, 45461, + 46445, 48237, 54149, 55301, 55853, 56621, 56717, 56901, + 5813, 58437, 12493, 15365, 15989, 17829, 18229, 19341, + 21013, 21357, 22925, 24885, 26053, 27581, 28221, 28485, + 30605, 30613, 30789, 35437, 36285, 37189, 3941, 41797, + 4269, 42901, 43293, 44645, 45221, 46893, 4893, 50301, + 50325, 5189, 52109, 53517, 54053, 54485, 5525, 55949, + 56973, 59069, 59421, 60733, 61253, 6421, 6701, 6709, + 7101, 8669, 15797, 19221, 19837, 20133, 20957, 21293, + 21461, 22461, 29085, 29861, 30869, 34973, 36469, 37565, + 38125, 38829, 39469, 40061, 40117, 44093, 47429, 48341, + 50597, 51757, 5541, 57629, 58405, 59621, 59693, 59701, + 61837, 7061, 10421, 11949, 15405, 20861, 25397, 25509, + 25893, 26037, 28629, 28869, 29605, 30213, 34205, 35637, + 36365, 37285, 3773, 39117, 4021, 41061, 42653, 44509, + 4461, 44829, 4725, 5125, 52269, 56469, 59085, 5917, + 60973, 8349, 17725, 18637, 19773, 20293, 21453, 22533, + 24285, 26333, 26997, 31501, 34541, 34805, 37509, 38477, + 41333, 44125, 46285, 46997, 47637, 48173, 4925, 50253, + 50381, 50917, 51205, 51325, 52165, 52229, 5253, 5269, + 53509, 56253, 56341, 5821, 58373, 60301, 61653, 61973, + 62373, 8397, 11981, 14341, 14509, 15077, 22261, 22429, + 24261, 28165, 28685, 30661, 34021, 34445, 39149, 3917, + 43013, 43317, 44053, 44101, 4533, 49541, 49981, 5277, + 54477, 56357, 57261, 57765, 58573, 59061, 60197, 61197, + 62189, 7725, 8477, 9565, 10229, 11437, 14613, 14709, + 16813, 20029, 20677, 31445, 3165, 31957, 3229, 33541, + 36645, 3805, 38973, 3965, 4029, 44293, 44557, 46245, + 48917, 4909, 51749, 53709, 55733, 56445, 5925, 6093, + 61053, 62637, 8661, 9109, 10821, 11389, 13813, 14325, + 15501, 16149, 18845, 22669, 26437, 29869, 31837, 33709, + 33973, 34173, 3677, 3877, 3981, 39885, 42117, 4421, + 44221, 44245, 44693, 46157, 47309, 5005, 51461, 52037, + 55333, 55693, 56277, 58949, 6205, 62141, 62469, 6293, + 10101, 12509, 14029, 17997, 20469, 21149, 25221, 27109, + 2773, 2877, 29405, 31493, 31645, 4077, 42005, 42077, + 42469, 42501, 44013, 48653, 49349, 4997, 50101, 55405, + 56957, 58037, 59429, 60749, 61797, 62381, 62837, 6605, + 10541, 23981, 24533, 2701, 27333, 27341, 31197, 33805, + 3621, 37381, 3749, 3829, 38533, 42613, 44381, 45901, + 48517, 51269, 57725, 59461, 60045, 62029, 13805, 14013, + 15461, 16069, 16157, 18573, 2309, 23501, 28645, 3077, + 31541, 36357, 36877, 3789, 39429, 39805, 47685, 47949, + 49413, 5485, 56757, 57549, 57805, 58317, 59549, 62213, + 62613, 62853, 62933, 8909, 12941, 16677, 20333, 21541, + 24429, 26077, 26421, 2885, 31269, 33381, 3661, 40925, + 42925, 45173, 4525, 4709, 53133, 55941, 57413, 57797, + 62125, 62237, 62733, 6773, 12317, 13197, 16533, 16933, + 18245, 2213, 2477, 29757, 33293, 35517, 40133, 40749, + 4661, 49941, 62757, 7853, 8149, 8573, 11029, 13421, + 21549, 22709, 22725, 24629, 2469, 26125, 2669, 34253, + 36709, 41013, 45597, 46637, 52285, 52333, 54685, 59013, + 60997, 61189, 61981, 62605, 62821, 7077, 7525, 8781, + 10861, 15277, 2205, 22077, 28517, 28949, 32109, 33493, + 3685, 39197, 39869, 42621, 44997, 48565, 5221, 57381, + 61749, 62317, 63245, 63381, 23149, 2549, 28661, 31653, + 33885, 36341, 37053, 39517, 42805, 45853, 48997, 59349, + 60053, 62509, 63069, 6525, 1893, 20181, 2365, 24893, + 27397, 31357, 32277, 33357, 34437, 36677, 37661, 43469, + 43917, 50997, 53869, 5653, 13221, 16741, 17893, 2157, + 28653, 31789, 35301, 35821, 61613, 62245, 12405, 14517, + 17453, 18421, 3149, 3205, 40341, 4109, 43941, 46869, + 48837, 50621, 57405, 60509, 62877, 8157, 12933, 12957, + 16501, 19533, 3461, 36829, 52357, 58189, 58293, 63053, + 17109, 1933, 32157, 37701, 59005, 61621, 13029, 15085, + 16493, 32317, 35093, 5061, 51557, 62221, 20765, 24613, + 2629, 30861, 33197, 33749, 35365, 37933, 40317, 48045, + 56229, 61157, 63797, 7917, 17965, 1917, 1973, 20301, + 2253, 33157, 58629, 59861, 61085, 63909, 8141, 9221, + 14757, 1581, 21637, 26557, 33869, 34285, 35733, 40933, + 42517, 43501, 53653, 61885, 63805, 7141, 21653, 54973, + 31189, 60061, 60341, 63357, 16045, 2053, 26069, 33997, + 43901, 54565, 63837, 8949, 17909, 18693, 32349, 33125, + 37293, 48821, 49053, 51309, 64037, 7117, 1445, 20405, + 23085, 26269, 26293, 27349, 32381, 33141, 34525, 36461, + 37581, 43525, 4357, 43877, 5069, 55197, 63965, 9845, + 12093, 2197, 2229, 32165, 33469, 40981, 42397, 8749, + 10853, 1453, 18069, 21693, 30573, 36261, 37421, 42533 +}; +#define NSID_MULT_TABLE_SIZE \ + ((sizeof nsid_multiplier_table)/(sizeof nsid_multiplier_table[0])) void -nsid_init() { - nsid_state = res_randomid(); +nsid_init(void) { + struct timeval now; + pid_t mypid; + u_int16_t a1ndx, a2ndx, a3ndx, c1ndx, c2ndx, c3ndx; + int i; + + if (nsid_algorithm != 0) + return; + + gettimeofday(&now, NULL); + mypid = getpid(); + + /* Initialize the state */ + nsid_hash_state = 0; + nsid_hash((u_char *)&now, sizeof now); + nsid_hash((u_char *)&mypid, sizeof mypid); + + /* + * Select our random number generators and initial seed. + * We could really use more random bits at this point, + * but we'll try to make a silk purse out of a sows ear ... + */ + /* generator 1 */ + a1ndx = ((u_long) NSID_MULT_TABLE_SIZE * + (nsid_hash_state & 0xFFFF)) >> 16; + nsid_a1 = nsid_multiplier_table[a1ndx]; + c1ndx = (nsid_hash_state >> 9) & 0x7FFF; + nsid_c1 = 2*c1ndx + 1; + /* generator 2, distinct from 1 */ + a2ndx = ((u_long) (NSID_MULT_TABLE_SIZE - 1) * + ((nsid_hash_state >> 10) & 0xFFFF)) >> 16; + if (a2ndx >= a1ndx) + a2ndx++; + nsid_a2 = nsid_multiplier_table[a2ndx]; + c2ndx = nsid_hash_state % 32767; + if (c2ndx >= c1ndx) + c2ndx++; + nsid_c2 = 2*c2ndx + 1; + /* generator 3, distinct from 1 and 2 */ + a3ndx = ((u_long) (NSID_MULT_TABLE_SIZE - 2) * + ((nsid_hash_state >> 20) & 0xFFFF)) >> 16; + if (a3ndx >= a1ndx || a3ndx >= a2ndx) + a3ndx++; + if (a3ndx >= a1ndx && a3ndx >= a2ndx) + a3ndx++; + nsid_a3 = nsid_multiplier_table[a3ndx]; + c3ndx = nsid_hash_state % 32766; + if (c3ndx >= c1ndx || c3ndx >= c2ndx) + c3ndx++; + if (c3ndx >= c1ndx && c3ndx >= c2ndx) + c3ndx++; + nsid_c3 = 2*c3ndx + 1; + + nsid_state = ((nsid_hash_state >> 16) ^ (nsid_hash_state)) & 0xFFFF; + + /* Do the algorithm specific initialization */ + INSIST(server_options != NULL); + if (NS_OPTION_P(OPTION_USE_ID_POOL) == 0) { + /* Algorithm 1 */ + nsid_algorithm = NSID_SHUFFLE_ONLY; + nsid_vtable = memget(NSID_SHUFFLE_TABLE_SIZE * + (sizeof(u_int16_t)) ); + if (!nsid_vtable) + ns_panic(ns_log_default, 1, "memget(nsid_vtable)", + NULL); + for (i = 0; i < NSID_SHUFFLE_TABLE_SIZE; i++) { + nsid_vtable[i] = nsid_state; + nsid_state = (((u_long) nsid_a1 * nsid_state) + nsid_c1) + & 0xFFFF; + } + nsid_state2 = nsid_state; + } else { + /* Algorithm 2 */ + nsid_algorithm = NSID_USE_POOL; + nsid_pool = memget(0x10000 * (sizeof(u_int16_t))); + if (!nsid_pool) + ns_panic(ns_log_default, 1, "memget(nsid_pool)", NULL); + for (i = 0; ; i++) { + nsid_pool[i] = nsid_state; + nsid_state = (((u_long) nsid_a1 * nsid_state) + nsid_c1) & 0xFFFF; + if (i == 0xFFFF) + break; + } + } } +#define NSID_RANGE_MASK (NSID_LOOKAHEAD - 1) + +#define NSID_POOL_MASK 0xFFFF /* used to wrap the pool index */ + u_int16_t nsid_next() { - if (nsid_state == 65535) - nsid_state = 0; - else - nsid_state++; - return (nsid_state); + u_int16_t id, compressed_hash; + + compressed_hash = ((nsid_hash_state >> 16) ^ (nsid_hash_state)) & + 0xFFFF; + if (nsid_algorithm == NSID_SHUFFLE_ONLY) { + u_int16_t j; + + /* + * This is the original Algorithm B + * j = ((u_long) NSID_SHUFFLE_TABLE_SIZE * nsid_state2) + * >> 16; + * + * We'll perturb it with some random stuff ... + */ + j = ((u_long) NSID_SHUFFLE_TABLE_SIZE * + (nsid_state2 ^ compressed_hash)) >> 16; + nsid_state2 = id = nsid_vtable[j]; + nsid_state = (((u_long) nsid_a1 * nsid_state) + nsid_c1) & + 0xFFFF; + nsid_vtable[j] = nsid_state; + } else if (nsid_algorithm == NSID_USE_POOL) { + u_int16_t pick; + + pick = compressed_hash & NSID_RANGE_MASK; + id = nsid_pool[(nsid_state + pick) & NSID_POOL_MASK]; + if (pick != 0) { + /* Swap two IDs to stir the pool */ + nsid_pool[(nsid_state + pick) & NSID_POOL_MASK] = + nsid_pool[nsid_state]; + nsid_pool[nsid_state] = id; + } + + /* increment the base pointer into the pool */ + if (nsid_state == 65535) + nsid_state = 0; + else + nsid_state++; + } else + ns_panic(ns_log_default, 1, "Unknown ID algorithm", NULL); + + /* Now lets obfuscate ... */ + id = (((u_long) nsid_a2 * id) + nsid_c2) & 0xFFFF; + id = (((u_long) nsid_a3 * id) + nsid_c3) & 0xFFFF; + + return (id); } +/* Note: this function CAN'T deallocate the saved_argv[]. */ static void deallocate_everything(void) { FILE *f; @@ -2010,6 +2495,7 @@ deallocate_everything(void) { free_addinfo(); ns_shutdown(); dq_remove_all(); + db_lame_destroy(); if (local_addresses != NULL) free_ip_match_list(local_addresses); if (local_networks != NULL) @@ -2020,12 +2506,23 @@ deallocate_everything(void) { evDestroy(ev); if (conffile != NULL) freestr(conffile); + conffile = NULL; + if (debugfile != NULL) + freestr(debugfile); + debugfile = NULL; if (user_name != NULL) freestr(user_name); + user_name = NULL; if (group_name != NULL) freestr(group_name); + group_name = NULL; if (chroot_dir != NULL) freestr(chroot_dir); + chroot_dir = NULL; + if (nsid_pool != NULL) + memput(nsid_pool, 0x10000 * (sizeof(u_int16_t))); + nsid_pool = NULL; + irs_destroy(); if (f != NULL) { memstats(f); (void)fclose(f); @@ -2034,7 +2531,12 @@ deallocate_everything(void) { static void ns_exit(void) { - ns_info(ns_log_default, "named shutting down"); + main_needs_exit++; +} + +static void +ns_restart(void) { + ns_info(ns_log_default, "named restarting"); #ifdef BIND_UPDATE dynamic_about_to_exit(); #endif @@ -2043,16 +2545,18 @@ ns_exit(void) { ns_logstats(ev, NULL, evNowTime(), evConsTime(0, 0)); if (NS_OPTION_P(OPTION_DEALLOC_ON_EXIT)) deallocate_everything(); - exit(0); + else + shutdown_configuration(); + execvp(saved_argv[0], saved_argv); + abort(); } static void use_desired_debug(void) { #ifdef DEBUG sigset_t set; - int bad; - /* protect against race conditions by blocking debugging signals */ + /* Protect against race conditions by blocking debugging signals. */ if (sigemptyset(&set) < 0) { ns_error(ns_log_os, @@ -2086,73 +2590,76 @@ use_desired_debug(void) { #endif } -static void +void toggle_qrylog(void) { qrylog = !qrylog; ns_notice(ns_log_default, "query log %s\n", qrylog ?"on" :"off"); } -#ifdef BIND_NOTIFY static void -do_notify_after_load(void) { - evDo(ev, (const void *)notify_after_load); +wild(void) { + ns_panic(ns_log_default, 1, "wild need", NULL); } -#endif - + /* * This is a functional interface to the global needs and options. */ -static const struct need_handler { - int need; - void (*handler)(void); - } need_handlers[] = { - { MAIN_NEED_RELOAD, ns_reload }, - { MAIN_NEED_MAINT, ns_maint }, - { MAIN_NEED_ENDXFER, endxfer }, - { MAIN_NEED_ZONELOAD, loadxfer }, - { MAIN_NEED_DUMP, doadump }, - { MAIN_NEED_STATSDUMP, ns_stats }, - { MAIN_NEED_EXIT, ns_exit }, - { MAIN_NEED_QRYLOG, toggle_qrylog }, - { MAIN_NEED_DEBUG, use_desired_debug }, -#ifdef BIND_NOTIFY - { MAIN_NEED_NOTIFY, do_notify_after_load }, -#endif - { 0, NULL } - }; +static void +init_needs(void) { + int need; + + for (need = 0; need < main_need_num; need++) + handlers[need] = wild; + handlers[main_need_zreload] = ns_zreload; + handlers[main_need_reload] = ns_reload; + handlers[main_need_reconfig] = ns_reconfig; + handlers[main_need_endxfer] = endxfer; + handlers[main_need_zoneload] = loadxfer; + handlers[main_need_dump] = doadump; + handlers[main_need_statsdump] = ns_stats; + handlers[main_need_exit] = ns_exit; + handlers[main_need_qrylog] = toggle_qrylog; + handlers[main_need_debug] = use_desired_debug; + handlers[main_need_restart] = ns_restart; + handlers[main_need_reap] = reapchild; +} -void -ns_setoption(int option) { - ns_warning(ns_log_default, "used obsolete ns_setoption(%d)", option); +static void +handle_need(void) { + int need; + + ns_debug(ns_log_default, 15, "handle_need()"); + for (need = 0; need < main_need_num; need++) + if ((needs & (1 << need)) != 0) { + /* Turn off flag first, handlers ~turn~ it back on. */ + block_signals(); + needs &= ~(1 << need); + unblock_signals(); + (handlers[need])(); + return; + } + ns_panic(ns_log_default, 1, "handle_need() found no needs", NULL); } void -ns_need(int need) { - needs |= need; +ns_need(enum need need) { + block_signals(); + ns_need_unsafe(need); + unblock_signals(); } -int -ns_need_p(int need) { - return ((needs & need) != 0); +/* Note: this function should only be called with signals blocked. */ +void +ns_need_unsafe(enum need need) { + needs |= (1 << need); } -static void -ns_handle_needs() { - const struct need_handler *nhp; - - for (nhp = need_handlers; nhp->need && nhp->handler; nhp++) { - if ((needs & nhp->need) != 0) { - /* - * Turn off flag first, handler might turn it back on. - */ - needs &= ~nhp->need; - (*nhp->handler)(); - } - } +void +ns_setoption(int option) { + ns_warning(ns_log_default, "used obsolete ns_setoption(%d)", option); } - void writestream(struct qstream *sp, const u_char *msg, int msglen) { if (sq_openw(sp, msglen + INT16SZ) == -1) { @@ -2166,45 +2673,6 @@ writestream(struct qstream *sp, const u_char *msg, int msglen) { sq_writeh(sp, sq_flushw); } -static void -set_signal_handler(int sig, SIG_FN (*handler)()) { - struct sigaction sa; - - memset(&sa, 0, sizeof sa); - sa.sa_handler = handler; - if (sigemptyset(&sa.sa_mask) < 0) { - ns_error(ns_log_os, - "sigemptyset failed in set_signal_handler(%d): %s", - sig, strerror(errno)); - return; - } - if (sigaction(sig, &sa, NULL) < 0) - ns_error(ns_log_os, - "sigaction failed in set_signal_handler(%d): %s", - sig, strerror(errno)); -} - -static void -init_signals() { - set_signal_handler(SIGINT, setdumpflg); - set_signal_handler(SIGILL, setstatsflg); -#ifdef DEBUG - set_signal_handler(SIGUSR1, setIncrDbgFlg); - set_signal_handler(SIGUSR2, setNoDbgFlg); -#endif - set_signal_handler(SIGHUP, onhup); -#if defined(SIGWINCH) && defined(QRYLOG) /* XXX */ - set_signal_handler(SIGWINCH, setQrylogFlg); -#endif - set_signal_handler(SIGCHLD, reapchild); - set_signal_handler(SIGPIPE, discard_pipe); - set_signal_handler(SIGTERM, onintr); -#if defined(SIGXFSZ) /* XXX */ - /* Wierd DEC Hesiodism, harmless. */ - set_signal_handler(SIGXFSZ, onhup); -#endif -} - static int only_digits(const char *s) { if (*s == '\0') @@ -2216,3 +2684,54 @@ only_digits(const char *s) { } return (1); } +#if defined(__GNUC__) && defined(__BOUNDS_CHECKING_ON) + /* Use bounds checking malloc, etc. */ +void * +memget(size_t len) { + return (malloc(len)); +} + +void +memput(void *addr, size_t len) { + free(addr); +} + +int +meminit(size_t init_max_size, size_t target_size) { + return (0); +} + +void * +memget_debug(size_t size, const char *file, int line) { + void *ptr; + ptr = __memget(size); + fprintf(stderr, "%s:%d: memget(%lu) -> %p\n", file, line, + (u_long)size, ptr); + return (ptr); +} + +void +memput_debug(void *ptr, size_t size, const char *file, int line) { + fprintf(stderr, "%s:%d: memput(%p, %lu)\n", file, line, ptr, + (u_long)size); + __memput(ptr, size); +} + +void +memstats(FILE *out) { + fputs("No memstats\n", out); +} +#endif + +#ifndef HAVE_CUSTOM +/* Standard implementation has nothing here */ +static void +custom_init(void) { + /* Noop. */ +} + +static void +custom_shutdown(void) { + /* Noop. */ +} +#endif |
