/* * Copyright (c) 1986, 1989, 1990 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint char copyright[] = "@(#) Copyright (c) 1986, 1989, 1990 Regents of the University of California.\n\ All rights reserved.\n"; #endif /* not lint */ #ifndef lint /*static char sccsid[] = "from: @(#)ns_main.c 4.55 (Berkeley) 7/1/91";*/ static char rcsid[] = "$Id: ns_main.c,v 1.1 1995/10/18 08:47:50 deraadt Exp $"; #endif /* not lint */ /* * Internet Name server (see rfc883 & others). */ #include #if defined(SYSV) #include #endif SYSV #include #include #if !defined(SYSV) #include #endif !SYSV #include #include #include #include #include #include #include #include #include #include #include #include #include #undef nsaddr /* XXX */ #include "ns.h" #include "db.h" #include "pathnames.h" #ifdef BOOTFILE /* default boot file */ char *bootfile = BOOTFILE; #else char *bootfile = _PATH_BOOT; #endif #ifdef DEBUGFILE /* default debug output file */ char *debugfile = DEBUGFILE; #else char *debugfile = _PATH_DEBUG; #endif #ifdef PIDFILE /* file to store current named PID */ char *PidFile = PIDFILE; #else char *PidFile = _PATH_PIDFILE; #endif #ifndef FD_SET #define NFDBITS 32 #define FD_SETSIZE 32 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS))) #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS))) #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS))) #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p))) #endif FILE *fp; /* file descriptor for pid file */ #ifdef DEBUG FILE *ddt; #endif int debug = 0; /* debugging flag */ int ds; /* datagram socket */ int needreload = 0; /* received SIGHUP, need to reload db */ int needmaint = 0; /* need to call ns_maint()*/ int needzoneload = 0; /* need to reload secondary zone(s) */ int needToDoadump = 0; /* need to dump database */ int needToChkpt = 0; /* need to checkpoint cache */ int needStatsDump = 0; /* need to dump statistics */ #ifdef ALLOW_UPDATES int needToExit = 0; /* need to exit (may need to doadump * first, if database has changed since * it was last dumped/booted). Gets * set by shutdown signal handler * (onintr) */ #endif ALLOW_UPDATES int priming = 0; /* is cache being primed */ #ifdef SO_RCVBUF int rbufsize = 8 * 1024; /* UDP recive buffer size */ #endif struct qstream *streamq = QSTREAM_NULL; /* list of open streams */ struct qdatagram *datagramq = QDATAGRAM_NULL; /* list of datagram interfaces */ struct sockaddr_in nsaddr; struct timeval tt; /* * We keep a list of favored networks headed by nettab. * There are three (possibly empty) parts to this list, in this order: * 1. directly attached (sub)nets. * 2. logical networks for directly attached subnetted networks. * 3. networks from the sort list. * The value (*elocal) points at the first entry in the second part of the list, * if any, while (*enettab) points at the first entry in the sort list. */ struct netinfo *nettab = NULL; struct netinfo **elocal = &nettab; struct netinfo **enettab = &nettab; struct netinfo netloop; struct netinfo *findnetinfo(); u_long net_mask(); u_short ns_port; struct sockaddr_in from_addr; /* Source addr of last packet */ int from_len; /* Source addr size of last packet */ time_t boottime, resettime; /* Used by ns_stats */ static fd_set mask; /* select mask of open descriptors */ static int nfds; /* number of fds for select */ static int vs; /* listening TCP socket */ char **Argv = NULL; /* pointer to argument vector */ char *LastArg = NULL; /* end of argv */ extern int errno; #if defined(SYSV) getdtablesize() { return(FD_SETSIZE); } #endif SYSV main(argc, argv, envp) int argc; char *argv[], *envp[]; { register int n, udpcnt; register char *arg; register struct qstream *sp; register struct qdatagram *dqp; struct qstream *nextsp; int on = 1; int rfd, size; u_long lasttime, maxctime; char buf[BUFSIZ]; #ifndef SYSV struct sigvec vec; #endif fd_set tmpmask; struct timeval t, *tp; struct qstream *candidate = QSTREAM_NULL; extern SIG_FN onintr(), maint_alarm(), endxfer(); extern SIG_FN setdumpflg(), onhup(); extern SIG_FN setIncrDbgFlg(), setNoDbgFlg(), sigprof(); extern SIG_FN setchkptflg(), setstatsflg(); extern int loadxfer(); extern struct qstream *sqadd(); extern struct qinfo *qhead; extern char Version[]; ns_port = htons(NAMESERVER_PORT); /* ** Save start and extent of argv for setproctitle. */ Argv = argv; if (envp == 0 || *envp == 0) envp = argv; while (*envp) envp++; LastArg = envp[-1] + strlen(envp[-1]); (void) umask(022); while (--argc > 0) { arg = *++argv; if (*arg == '-') { while (*++arg) switch (*arg) { case 'b': if (--argc <= 0) usage(); bootfile = *++argv; break; case 'd': ++argv; if (*argv != 0) { if (**argv == '-') { argv--; break; } debug = atoi(*argv); --argc; } if (debug <= 0) debug = 1; setdebug(1); break; case 'p': if (--argc <= 0) usage(); ns_port = htons((u_short)atoi(*++argv)); break; default: usage(); } } else bootfile = *argv; } if (!debug) for (n = getdtablesize() - 1; n > 2; n--) (void) close(n); #ifdef DEBUG else { fprintf(ddt,"Debug turned ON, Level %d\n",debug); fprintf(ddt,"Version = %s\t",Version); fprintf(ddt,"bootfile = %s\n",bootfile); } #endif #ifdef LOG_DAEMON openlog("named", LOG_PID|LOG_CONS|LOG_NDELAY, LOG_DAEMON); #else openlog("named", LOG_PID); #endif /* tuck my process id away */ fp = fopen(PidFile, "w"); if (fp != NULL) { fprintf(fp, "%d\n", getpid()); (void) fclose(fp); } syslog(LOG_NOTICE, "restarted\n"); _res.options &= ~(RES_DEFNAMES | RES_DNSRCH | RES_RECURSE); nsaddr.sin_family = AF_INET; nsaddr.sin_addr.s_addr = INADDR_ANY; nsaddr.sin_port = ns_port; /* ** Open stream port. */ if ((vs = socket(AF_INET, SOCK_STREAM, 0)) < 0) { syslog(LOG_ERR, "socket(SOCK_STREAM): %m"); exit(1); } (void)setsockopt(vs, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)); if (bind(vs, (struct sockaddr *)&nsaddr, sizeof(nsaddr))) { syslog(LOG_ERR, "bind(vs, %s[%d]): %m", inet_ntoa(nsaddr.sin_addr), ntohs(nsaddr.sin_port)); exit(1); } (void) listen(vs, 5); /* * Get list of local addresses and set up datagram sockets. */ getnetconf(); /* ** Initialize and load database. */ gettime(&tt); buildservicelist(); buildprotolist(); ns_init(bootfile); #ifdef DEBUG if (debug) { fprintf(ddt, "Network and sort list:\n"); printnetinfo(nettab); } #endif DEBUG time(&boottime); resettime = boottime; (void) signal(SIGHUP, onhup); #if defined(SYSV) (void) signal(SIGCLD, endxfer); (void) signal(SIGALRM, maint_alarm); #else bzero((char *)&vec, sizeof(vec)); vec.sv_handler = maint_alarm; vec.sv_mask = sigmask(SIGCHLD); (void) sigvec(SIGALRM, &vec, (struct sigvec *)NULL); vec.sv_handler = endxfer; vec.sv_mask = sigmask(SIGALRM); (void) sigvec(SIGCHLD, &vec, (struct sigvec *)NULL); #endif SYSV (void) signal(SIGPIPE, SIG_IGN); (void) signal(SIGSYS, sigprof); (void) signal(SIGINT, setdumpflg); (void) signal(SIGQUIT, setchkptflg); (void) signal(SIGIOT, setstatsflg); #ifdef ALLOW_UPDATES /* Catch SIGTERM so we can dump the database upon shutdown if it has changed since it was last dumped/booted */ (void) signal(SIGTERM, onintr); #endif ALLOW_UPDATES #if defined(SIGUSR1) && defined(SIGUSR2) (void) signal(SIGUSR1, setIncrDbgFlg); (void) signal(SIGUSR2, setNoDbgFlg); #else SIGUSR1&&SIGUSR2 (void) signal(SIGEMT, setIncrDbgFlg); (void) signal(SIGFPE, setNoDbgFlg); #endif SIGUSR1&&SIGUSR2 #ifdef DEBUG if (debug) { fprintf(ddt,"database initialized\n"); } #endif t.tv_usec = 0; /* * Fork and go into background now that * we've done any slow initialization * and are ready to answer queries. */ if (!debug) { #if defined(BSD) && BSD >= 199006 daemon(1, 0); #else if (fork() > 0) exit(0); n = open(_PATH_DEVNULL, O_RDONLY); (void) dup2(n, 0); (void) dup2(n, 1); (void) dup2(n, 2); if (n > 2) (void) close(n); #ifdef SYSV setpgrp(); #else { struct itimerval ival; /* * The open below may hang on pseudo ttys if the person * who starts named logs out before this point. * * needmaint may get set inapropriately if the open * hangs, but all that will happen is we will see that * no maintenance is required. */ bzero((char *)&ival, sizeof(ival)); ival.it_value.tv_sec = 120; (void) setitimer(ITIMER_REAL, &ival, (struct itimerval *)NULL); n = open(_PATH_TTY, O_RDWR); ival.it_value.tv_sec = 0; (void) setitimer(ITIMER_REAL, &ival, (struct itimerval *)NULL); if (n > 0) { (void) ioctl(n, TIOCNOTTY, (char *)NULL); (void) close(n); } } #endif /* SYSV */ #endif /* BSD > 199006 */ } /* tuck my process id away again */ fp = fopen(PidFile, "w"); if (fp != NULL) { fprintf(fp, "%d\n", getpid()); (void) fclose(fp); } #ifdef DEBUG if (debug) fprintf(ddt,"Ready to answer queries.\n"); #endif prime_cache(); FD_ZERO(&mask); FD_SET(vs, &mask); if (vs >= nfds) nfds = vs + 1; for (dqp = datagramq; dqp != QDATAGRAM_NULL; dqp = dqp->dq_next) { FD_SET(dqp->dq_dfd, &mask); if (dqp->dq_dfd >= nfds) nfds = dqp->dq_dfd + 1; } for (;;) { #ifdef DEBUG if (ddt && debug == 0) { fprintf(ddt,"Debug turned OFF\n"); (void) fclose(ddt); ddt = 0; } #endif #ifdef ALLOW_UPDATES if (needToExit) { struct zoneinfo *zp; sigblock(~0); /* * Block all blockable signals * to ensure a consistant * state during final dump */ #ifdef DEBUG if (debug) fprintf(ddt, "Received shutdown signal\n"); #endif DEBUG for (zp = zones; zp < &zones[nzones]; zp++) { if (zp->hasChanged) zonedump(zp); } exit(0); } #endif ALLOW_UPDATES if (needreload) { needreload = 0; db_reload(); } #ifdef STATS if (needStatsDump) { needStatsDump = 0; ns_stats(); } #endif STATS if (needzoneload) { needzoneload = 0; loadxfer(); } if (needmaint) { needmaint = 0; ns_maint(); } if(needToChkpt) { needToChkpt = 0; doachkpt(); } if(needToDoadump) { needToDoadump = 0; doadump(); } /* ** Wait until a query arrives */ if (retryqp != NULL) { gettime(&tt); t.tv_sec = (long) retryqp->q_time - tt.tv_sec; if (t.tv_sec <= 0) { retry(retryqp); continue; } tp = &t; } else tp = NULL; tmpmask = mask; n = select(nfds, &tmpmask, (fd_set *)NULL, (fd_set *)NULL, tp); if (n < 0) { if (errno == EINTR) continue; syslog(LOG_ERR, "select: %m"); #ifdef DEBUG if (debug) fprintf(ddt,"select error\n"); #endif ; } if (n == 0) continue; for (dqp = datagramq; dqp != QDATAGRAM_NULL; dqp = dqp->dq_next) { if (FD_ISSET(dqp->dq_dfd, &tmpmask)) for(udpcnt = 0; udpcnt < 25; udpcnt++) { from_len = sizeof(from_addr); if ((n = recvfrom(dqp->dq_dfd, buf, sizeof(buf), 0, (struct sockaddr *)&from_addr, &from_len)) < 0) { if ((n == -1) && (errno == EWOULDBLOCK)) break; syslog(LOG_WARNING, "recvfrom: %m"); break; } #ifdef STATS stats[S_INPKTS].cnt++; #endif #ifdef DEBUG if (debug) fprintf(ddt, "\ndatagram from %s port %d, fd %d, len %d\n", inet_ntoa(from_addr.sin_addr), ntohs(from_addr.sin_port), dqp->dq_dfd, n); if (debug >= 10) fp_query(buf, ddt); #endif /* * Consult database to get the answer. */ gettime(&tt); ns_req(buf, n, PACKETSZ, QSTREAM_NULL, &from_addr, dqp->dq_dfd); } } /* ** Process stream connection */ if (FD_ISSET(vs, &tmpmask)) { from_len = sizeof(from_addr); rfd = accept(vs, (struct sockaddr *)&from_addr, &from_len); gettime(&tt); if (rfd < 0 && errno == EMFILE && streamq != NULL) { maxctime = 0; candidate = QSTREAM_NULL; for (sp = streamq; sp != QSTREAM_NULL; sp = nextsp) { nextsp = sp->s_next; if (sp->s_refcnt != 0) continue; lasttime = tt.tv_sec - sp->s_time; if (lasttime >= 900) sqrm(sp); else if (lasttime > maxctime) { candidate = sp; maxctime = lasttime; } } rfd = accept(vs, (struct sockaddr *)&from_addr, &from_len); if ((rfd < 0) && (errno == EMFILE) && candidate != QSTREAM_NULL) { sqrm(candidate); rfd = accept(vs, (struct sockaddr *)&from_addr, &from_len); } } if (rfd < 0) { syslog(LOG_WARNING, "accept: %m"); continue; } (void) fcntl(rfd, F_SETFL, O_NONBLOCK); (void) setsockopt(rfd, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, sizeof(on)); if ((sp = sqadd()) == QSTREAM_NULL) { (void) close(rfd); continue; } sp->s_rfd = rfd; /* stream file descriptor */ sp->s_size = -1; /* amount of data to receive */ gettime(&tt); sp->s_time = tt.tv_sec; /* last transaction time */ sp->s_from = from_addr; /* address to respond to */ sp->s_bufp = (char *)&sp->s_tempsize; FD_SET(rfd, &mask); FD_SET(rfd, &tmpmask); if (rfd >= nfds) nfds = rfd + 1; #ifdef DEBUG if (debug) { fprintf(ddt, "\nTCP connection from %s port %d (fd %d)\n", inet_ntoa(sp->s_from.sin_addr), ntohs(sp->s_from.sin_port), rfd); } #endif } #ifdef DEBUG if (debug > 2 && streamq) fprintf(ddt,"streamq = x%x\n",streamq); #endif if (streamq != NULL) { for (sp = streamq; sp != QSTREAM_NULL; sp = nextsp) { nextsp = sp->s_next; if (FD_ISSET(sp->s_rfd, &tmpmask)) { #ifdef DEBUG if (debug > 5) { fprintf(ddt, "sp x%x rfd %d size %d time %d ", sp, sp->s_rfd, sp->s_size, sp->s_time ); fprintf(ddt," next x%x \n", sp->s_next ); fprintf(ddt,"\tbufsize %d",sp->s_bufsize); fprintf(ddt," buf x%x ",sp->s_buf); fprintf(ddt," bufp x%x\n",sp->s_bufp); } #endif DEBUG if (sp->s_size < 0) { size = sizeof(u_short) - (sp->s_bufp - (char *)&sp->s_tempsize); while (size > 0 && (n = read(sp->s_rfd, sp->s_bufp, size)) > 0){ sp->s_bufp += n; size -= n; } if ((n == -1) && (errno == EWOULDBLOCK)) continue; if (n <= 0) { sqrm(sp); continue; } if ((sp->s_bufp - (char *)&sp->s_tempsize) == sizeof(u_short)) { sp->s_size = htons(sp->s_tempsize); if (sp->s_bufsize == 0) { if ( (sp->s_buf = malloc(BUFSIZ)) == NULL) { sp->s_buf = buf; sp->s_size = sizeof(buf); } else { sp->s_bufsize = BUFSIZ; } } if (sp->s_size > sp->s_bufsize && sp->s_bufsize != 0) { if ((sp->s_buf = realloc( (char *)sp->s_buf, (unsigned)sp->s_size)) == NULL){ sp->s_buf = buf; sp->s_bufsize = 0; sp->s_size = sizeof(buf); } else { sp->s_bufsize = sp->s_size; } } sp->s_bufp = sp->s_buf; } } gettime(&tt); sp->s_time = tt.tv_sec; while (sp->s_size > 0 && (n = read(sp->s_rfd, sp->s_bufp, sp->s_size)) > 0) { sp->s_bufp += n; sp->s_size -= n; } /* * we don't have enough memory for the query. * if we have a query id, then we will send an * error back to the user. */ if (sp->s_bufsize == 0 && (sp->s_bufp - sp->s_buf > sizeof(u_short))) { HEADER *hp; hp = (HEADER *)sp->s_buf; hp->qr = 1; hp->ra = 1; hp->ancount = 0; hp->qdcount = 0; hp->nscount = 0; hp->arcount = 0; hp->rcode = SERVFAIL; (void) writemsg(sp->s_rfd, sp->s_buf, sizeof(HEADER)); continue; } if ((n == -1) && (errno == EWOULDBLOCK)) continue; if (n <= 0) { sqrm(sp); continue; } /* * Consult database to get the answer. */ if (sp->s_size == 0) { sq_query(sp); ns_req(sp->s_buf, sp->s_bufp - sp->s_buf, sp->s_bufsize, sp, &sp->s_from, -1); sp->s_bufp = (char *)&sp->s_tempsize; sp->s_size = -1; continue; } } } } } /* NOTREACHED */ } usage() { fprintf(stderr, "Usage: named [-d #] [-p port] [{-b} bootfile]\n"); exit(1); } getnetconf() { register struct netinfo *ntp; struct netinfo *ontp; struct ifconf ifc; struct ifreq ifreq, *ifr; struct qdatagram *dqp; static int first = 1; char buf[BUFSIZ], *cp, *cplim; u_long nm; ifc.ifc_len = sizeof(buf); ifc.ifc_buf = buf; if (ioctl(vs, SIOCGIFCONF, (char *)&ifc) < 0) { syslog(LOG_ERR, "get interface configuration: %m"); exit(1); } ntp = NULL; #ifdef AF_LINK #define max(a, b) (a > b ? a : b) #define size(p) max((p).sa_len, sizeof(p)) #else #define size(p) (sizeof (p)) #endif cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ for (cp = buf; cp < cplim; cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { #undef size ifr = (struct ifreq *)cp; if (ifr->ifr_addr.sa_family != AF_INET || ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr.s_addr == 0) continue; ifreq = *ifr; /* * Don't test IFF_UP, packets may still be received at this * address if any other interface is up. */ if (ioctl(vs, SIOCGIFADDR, (char *)&ifreq) < 0) { syslog(LOG_ERR, "get interface addr: %m"); continue; } /* build datagram queue */ /* * look for an already existing source interface address. * This happens mostly when reinitializing. Also, if * the machine has multiple point to point interfaces, then * the local address may appear more than once. */ for (dqp=datagramq; dqp != NULL; dqp = dqp->dq_next) if (((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr == dqp->dq_addr.s_addr) { #ifdef DEBUG if (debug) fprintf(ddt, "dup interface address %s on %s\n", inet_ntoa(dqp->dq_addr), ifreq.ifr_name); #endif break; } if (dqp != NULL) continue; if ((dqp = (struct qdatagram *)calloc(1, sizeof(struct qdatagram))) == NULL) { #ifdef DEBUG if (debug >= 5) fprintf(ddt,"getnetconf: malloc error\n"); #endif syslog(LOG_ERR, "getnetconf: Out Of Memory"); exit(12); } dqp->dq_next = datagramq; datagramq = dqp; dqp->dq_addr = ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr; opensocket(dqp); /* * Add interface to list of directly-attached (sub)nets * for use in sorting addresses. */ if (ntp == NULL) ntp = (struct netinfo *)malloc(sizeof(struct netinfo)); ntp->my_addr = ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr; #ifdef SIOCGIFNETMASK if (ioctl(vs, SIOCGIFNETMASK, (char *)&ifreq) < 0) { syslog(LOG_ERR, "get netmask: %m"); ntp->mask = net_mask(ntp->my_addr); } else ntp->mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; #else /* 4.2 does not support subnets */ ntp->mask = net_mask(ntp->my_addr); #endif if (ioctl(vs, SIOCGIFFLAGS, (char *)&ifreq) < 0) { syslog(LOG_ERR, "get interface flags: %m"); continue; } #ifdef IFF_LOOPBACK if (ifreq.ifr_flags & IFF_LOOPBACK) #else /* test against 127.0.0.1 (yuck!!) */ if (ntp->my_addr.s_addr == htonl(0x7F000001)) #endif { if (netloop.my_addr.s_addr == 0) { netloop.my_addr = ntp->my_addr; netloop.mask = 0xffffffff; netloop.net = ntp->my_addr.s_addr; #ifdef DEBUG if (debug) fprintf(ddt,"loopback address: x%lx\n", netloop.my_addr.s_addr); #endif DEBUG } continue; } else if ((ifreq.ifr_flags & IFF_POINTOPOINT)) { if (ioctl(vs, SIOCGIFDSTADDR, (char *)&ifreq) < 0) { syslog(LOG_ERR, "get dst addr: %m"); continue; } ntp->mask = 0xffffffff; ntp->net = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; } else { ntp->net = ntp->mask & ntp->my_addr.s_addr; } /* * Place on end of list of locally-attached (sub)nets, * but before logical nets for subnetted nets. */ ntp->next = *elocal; *elocal = ntp; if (elocal == enettab) enettab = &ntp->next; elocal = &ntp->next; ntp = NULL; } if (ntp) (void) free((char *)ntp); /* * Create separate qdatagram structure for socket * wildcard address. */ if (first) { if ((dqp = (struct qdatagram *)calloc(1, sizeof(*dqp))) == NULL) { #ifdef DEBUG if (debug >= 5) fprintf(ddt,"getnetconf: malloc error\n"); #endif syslog(LOG_ERR, "getnetconf: Out Of Memory"); exit(12); } dqp->dq_next = datagramq; datagramq = dqp; dqp->dq_addr.s_addr = INADDR_ANY; opensocket(dqp); ds = dqp->dq_dfd; /* used externally */ } /* * Compute logical networks to which we're connected * based on attached subnets; * used for sorting based on network configuration. */ for (ntp = nettab; ntp != NULL; ntp = ntp->next) { nm = net_mask(ntp->my_addr); if (nm != ntp->mask) { if (findnetinfo(ntp->my_addr)) continue; ontp = (struct netinfo *)malloc(sizeof(struct netinfo)); if (ontp == NULL) { #ifdef DEBUG if (debug >= 5) fprintf(ddt,"getnetconf: malloc error\n"); #endif syslog(LOG_ERR, "getnetconf: Out Of Memory"); exit(12); } ontp->my_addr = ntp->my_addr; ontp->mask = nm; ontp->net = ontp->my_addr.s_addr & nm; ontp->next = *enettab; *enettab = ontp; enettab = &ontp->next; } } first = 0; } /* * Find netinfo structure for logical network implied by address "addr", * if it's on list of local/favored networks. */ struct netinfo * findnetinfo(addr) struct in_addr addr; { register struct netinfo *ntp; u_long net, mask; mask = net_mask(addr); net = addr.s_addr & mask; for (ntp = nettab; ntp != NULL; ntp = ntp->next) if (ntp->net == net && ntp->mask == mask) return (ntp); return ((struct netinfo *) NULL); } #ifdef DEBUG printnetinfo(ntp) register struct netinfo *ntp; { for ( ; ntp != NULL; ntp = ntp->next) { fprintf(ddt,"net x%lx mask x%lx", ntp->net, ntp->mask); fprintf(ddt," my_addr x%lx", ntp->my_addr.s_addr); fprintf(ddt," %s\n", inet_ntoa(ntp->my_addr)); } } #endif opensocket(dqp) register struct qdatagram *dqp; { int on = 1; /* * Open datagram sockets bound to interface address. */ if ((dqp->dq_dfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "socket(SOCK_DGRAM): %m"); exit(1); } #ifdef DEBUG if (debug) fprintf(ddt,"dqp->dq_addr %s d_dfd %d\n", inet_ntoa(dqp->dq_addr), dqp->dq_dfd); #endif DEBUG (void)setsockopt(dqp->dq_dfd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)); #ifdef SO_RCVBUF (void)setsockopt(dqp->dq_dfd, SOL_SOCKET, SO_RCVBUF, (char *)&rbufsize, sizeof(rbufsize)); #endif SO_RCVBUF (void) fcntl(dqp->dq_dfd, F_SETFL, O_NONBLOCK); /* * NOTE: Some versions of SunOS have problems with the following * call to bind. Bind still seems to function on these systems * if you comment out the exit inside the if. This may cause * Suns with multiple interfaces to reply strangely. */ nsaddr.sin_addr = dqp->dq_addr; if (bind(dqp->dq_dfd, (struct sockaddr *)&nsaddr, sizeof(nsaddr))) { syslog(LOG_ERR, "bind(dfd %d, %s[%d]): %m", dqp->dq_dfd, inet_ntoa(nsaddr.sin_addr), ntohs(nsaddr.sin_port)); #if !defined(sun) exit(1); #endif } } /* ** Set flag saying to reload database upon receiving SIGHUP. ** Must make sure that someone isn't walking through a data ** structure at the time. */ SIG_FN onhup() { #if defined(SYSV) (void)signal(SIGHUP, onhup); #endif SYSV needreload = 1; } /* ** Set flag saying to call ns_maint() ** Must make sure that someone isn't walking through a data ** structure at the time. */ SIG_FN maint_alarm() { #if defined(SYSV) (void)signal(SIGALRM, maint_alarm); #endif SYSV needmaint = 1; } #ifdef ALLOW_UPDATES /* * Signal handler to schedule shutdown. Just set flag, to ensure a consistent * state during dump. */ SIG_FN onintr() { needToExit = 1; } #endif ALLOW_UPDATES /* * Signal handler to schedule a data base dump. Do this instead of dumping the * data base immediately, to avoid seeing it in a possibly inconsistent state * (due to updates), and to avoid long disk I/O delays at signal-handler * level */ SIG_FN setdumpflg() { #if defined(SYSV) (void)signal(SIGINT, setdumpflg); #endif SYSV needToDoadump = 1; } /* ** Turn on or off debuging by open or closeing the debug file */ setdebug(code) int code; { #if defined(lint) && !defined(DEBUG) code = code; #endif #ifdef DEBUG if (code) { ddt = freopen(debugfile, "w+", stderr); if ( ddt == NULL) { syslog(LOG_WARNING, "can't open debug file %s: %m", debugfile); debug = 0; } else { #if defined(SYSV) setvbuf(ddt, NULL, _IOLBF, BUFSIZ); #else setlinebuf(ddt); #endif (void) fcntl(fileno(ddt), F_SETFL, FAPPEND); } } else debug = 0; /* delay closing ddt, we might interrupt someone */ #endif } /* ** Catch a special signal and set debug level. ** ** If debuging is off then turn on debuging else increment the level. ** ** Handy for looking in on long running name servers. */ SIG_FN setIncrDbgFlg() { #if defined(SYSV) (void)signal(SIGUSR1, setIncrDbgFlg); #endif SYSV #ifdef DEBUG if (debug == 0) { debug++; setdebug(1); } else { debug++; } fprintf(ddt,"Debug turned ON, Level %d\n",debug); #endif } /* ** Catch a special signal to turn off debugging */ SIG_FN setNoDbgFlg() { #if defined(SYSV) (void)signal(SIGUSR2, setNoDbgFlg); #endif SYSV setdebug(0); } /* ** Set flag for statistics dump */ SIG_FN setstatsflg() { #if defined(SYSV) (void)signal(SIGIOT, setstatsflg); #endif SYSV needStatsDump = 1; } SIG_FN setchkptflg() { #if defined(SYSV) (void)signal(SIGQUIT, setchkptflg); #endif SYSV needToChkpt = 1; } /* ** Catch a special signal SIGSYS ** ** this is setup to fork and exit to drop to /usr/tmp/gmon.out ** and keep the server running */ SIG_FN sigprof() { #if defined(SYSV) (void)signal(SIGSYS, sigprof); #endif SYSV #ifdef DEBUG if (debug) fprintf(ddt,"sigprof()\n"); #endif if ( fork() == 0) { (void) chdir(_PATH_TMPDIR); exit(1); } } /* ** Routines for managing stream queue */ struct qstream * sqadd() { register struct qstream *sqp; if ((sqp = (struct qstream *)calloc(1, sizeof(struct qstream))) == NULL ) { #ifdef DEBUG if (debug >= 5) fprintf(ddt,"sqadd: malloc error\n"); #endif syslog(LOG_ERR, "sqadd: Out Of Memory"); return(QSTREAM_NULL); } #ifdef DEBUG if (debug > 3) fprintf(ddt,"sqadd(x%x)\n", sqp); #endif sqp->s_next = streamq; streamq = sqp; return(sqp); } /* * Remove stream queue structure. * No current queries may refer to this stream when it is removed. */ sqrm(qp) register struct qstream *qp; { register struct qstream *qsp; #ifdef DEBUG if (debug > 1) { fprintf(ddt,"sqrm(%#x, %d ) rfcnt=%d\n", qp, qp->s_rfd, qp->s_refcnt); } #endif if (qp->s_bufsize != 0) (void) free(qp->s_buf); FD_CLR(qp->s_rfd, &mask); (void) close(qp->s_rfd); if (qp == streamq) { streamq = qp->s_next; } else { for (qsp = streamq; qsp->s_next != qp; qsp = qsp->s_next) ; qsp->s_next = qp->s_next; } (void)free((char *)qp); } sqflush() { register struct qstream *sp, *spnext; for (sp = streamq; sp != QSTREAM_NULL; sp = spnext) { spnext = sp->s_next; sqrm(sp); } } /* * Initiate query on stream; * mark as referenced and stop selecting for input. */ sq_query(sp) register struct qstream *sp; { sp->s_refcnt++; FD_CLR(sp->s_rfd, &mask); } /* * Note that the current request on a stream has completed, * and that we should continue looking for requests on the stream. */ sq_done(sp) register struct qstream *sp; { sp->s_refcnt = 0; sp->s_time = tt.tv_sec; FD_SET(sp->s_rfd, &mask); } setproctitle(a, s) char *a; int s; { int size; register char *cp; struct sockaddr_in sin; char buf[80]; cp = Argv[0]; size = sizeof(sin); if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr)); else { syslog(LOG_DEBUG, "getpeername: %m"); (void) sprintf(buf, "-%s", a); } (void) strncpy(cp, buf, LastArg - cp); cp += strlen(cp); while (cp < LastArg) *cp++ = ' '; } u_long net_mask(in) struct in_addr in; { register u_long i = ntohl(in.s_addr); if (IN_CLASSA(i)) return (htonl(IN_CLASSA_NET)); else if (IN_CLASSB(i)) return (htonl(IN_CLASSB_NET)); else return (htonl(IN_CLASSC_NET)); } gettime(ttp) struct timeval *ttp; { if (gettimeofday(ttp, (struct timezone *)0) < 0) syslog(LOG_ERR, "gettimeofday failed: %m"); return; }