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Diffstat (limited to 'ircd/res_init.c')
| -rw-r--r-- | ircd/res_init.c | 642 |
1 files changed, 642 insertions, 0 deletions
diff --git a/ircd/res_init.c b/ircd/res_init.c new file mode 100644 index 0000000..126144a --- /dev/null +++ b/ircd/res_init.c @@ -0,0 +1,642 @@ +/* + * ++Copyright++ 1985, 1989, 1993 + * - + * Copyright (c) 1985, 1989, 1993 + * The 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. + * - + * Portions Copyright (c) 1993 by Digital Equipment Corporation. + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies, and that + * the name of Digital Equipment Corporation not be used in advertising or + * publicity pertaining to distribution of the document or software without + * specific, written prior permission. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL + * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT + * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL + * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR + * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS + * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS + * SOFTWARE. + * - + * --Copyright-- + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; +static char rcsid[] = "$Id: res_init.c,v 1.10 1999/01/20 01:33:08 kalt Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include "os.h" +#include "s_defines.h" +#define RES_INIT_C +#include "s_externs.h" +#undef RES_INIT_C + +/*-------------------------------------- info about "sortlist" -------------- + * Marc Majka 1994/04/16 + * Allan Nathanson 1994/10/29 (BIND 4.9.3.x) + * + * NetInfo resolver configuration directory support. + * + * Allow a NetInfo directory to be created in the hierarchy which + * contains the same information as the resolver configuration file. + * + * - The local domain name is stored as the value of the "domain" property. + * - The Internet address(es) of the name server(s) are stored as values + * of the "nameserver" property. + * - The name server addresses are stored as values of the "nameserver" + * property. + * - The search list for host-name lookup is stored as values of the + * "search" property. + * - The sortlist comprised of IP address netmask pairs are stored as + * values of the "sortlist" property. The IP address and optional netmask + * should be seperated by a slash (/) or ampersand (&) character. + * - Internal resolver variables can be set from the value of the "options" + * property. + */ +#if defined(NEXT) +# define NI_PATH_RESCONF "/locations/resolver" +# define NI_TIMEOUT 10 +static int ircd_netinfo_res_init __P((int *haveenv, int *havesearch)); +#endif + +static void ircd_res_setoptions __P((char *, char *)); + +#ifdef RESOLVSORT +static const char sort_mask[] = "/&"; +#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) +#ifdef INET6 +static u_int32_t ircd_net_mask __P((struct in_addr)); +#else +static u_int32_t ircd_net_mask __P((struct in_addr)); +#endif +#endif + +#if !defined(isascii) /* XXX - could be a function */ +# define isascii(c) (!(c & 0200)) +#endif + +/* + * Resolver state default settings. + */ + +struct __res_state ircd_res +# if defined(__BIND_RES_TEXT) + = { RES_TIMEOUT, } /* Motorola, et al. */ +# endif + ; + +/* + * Set up default settings. If the configuration file exist, the values + * there will have precedence. Otherwise, the server address is set to + * INADDR_ANY and the default domain name comes from the gethostname(). + * + * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1 + * rather than INADDR_ANY ("0.0.0.0") as the default name server address + * since it was noted that INADDR_ANY actually meant ``the first interface + * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface, + * it had to be "up" in order for you to reach your own name server. It + * was later decided that since the recommended practice is to always + * install local static routes through 127.0.0.1 for all your network + * interfaces, that we could solve this problem without a code change. + * + * The configuration file should always be used, since it is the only way + * to specify a default domain. If you are running a server on your local + * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1" + * in the configuration file. + * + * Return 0 if completes successfully, -1 on error + */ +int +ircd_res_init() +{ + register FILE *fp; + register char *cp, **pp; + register int n; + char buf[MAXDNAME]; + int nserv = 0; /* number of nameserver records read from file */ + int haveenv = 0; + int havesearch = 0; +#ifdef RESOLVSORT + int nsort = 0; + char *net; +#endif +#ifndef RFC1535 + int dots; +#endif + + /* + * These three fields used to be statically initialized. This made + * it hard to use this code in a shared library. It is necessary, + * now that we're doing dynamic initialization here, that we preserve + * the old semantics: if an application modifies one of these three + * fields of _res before res_init() is called, res_init() will not + * alter them. Of course, if an application is setting them to + * _zero_ before calling res_init(), hoping to override what used + * to be the static default, we can't detect it and unexpected results + * will follow. Zero for any of these fields would make no sense, + * so one can safely assume that the applications were already getting + * unexpected results. + * + * _res.options is tricky since some apps were known to diddle the bits + * before res_init() was first called. We can't replicate that semantic + * with dynamic initialization (they may have turned bits off that are + * set in RES_DEFAULT). Our solution is to declare such applications + * "broken". They could fool us by setting RES_INIT but none do (yet). + */ + if (!ircd_res.retrans) + ircd_res.retrans = RES_TIMEOUT; + if (!ircd_res.retry) + ircd_res.retry = 4; + if (!(ircd_res.options & RES_INIT)) + ircd_res.options = RES_DEFAULT; + + /* + * This one used to initialize implicitly to zero, so unless the app + * has set it to something in particular, we can randomize it now. + */ + if (!ircd_res.id) + ircd_res.id = ircd_res_randomid(); + +/*ifdef INET6 not, because of IPv4 DNS serving */ +#ifdef USELOOPBACK + ircd_res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); +#else + ircd_res.nsaddr.sin_addr.s_addr = INADDR_ANY; +#endif + ircd_res.nsaddr.sin_family = AF_INET; + ircd_res.nsaddr.sin_port = htons(NAMESERVER_PORT); + ircd_res.nscount = 1; + ircd_res.ndots = 1; + ircd_res.pfcode = 0; + + /* Allow user to override the local domain definition */ + if ((cp = getenv("LOCALDOMAIN")) != NULL) { + strncpyzt(ircd_res.defdname, cp, sizeof(ircd_res.defdname)); + haveenv++; + + /* + * Set search list to be blank-separated strings + * from rest of env value. Permits users of LOCALDOMAIN + * to still have a search list, and anyone to set the + * one that they want to use as an individual (even more + * important now that the rfc1535 stuff restricts searches) + */ + cp = ircd_res.defdname; + pp = ircd_res.dnsrch; + *pp++ = cp; + for (n = 0; *cp && pp < ircd_res.dnsrch + MAXDNSRCH; cp++) { + if (*cp == '\n') /* silly backwards compat */ + break; + else if (*cp == ' ' || *cp == '\t') { + *cp = 0; + n = 1; + } else if (n) { + *pp++ = cp; + n = 0; + havesearch = 1; + } + } + /* null terminate last domain if there are excess */ + while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') + cp++; + *cp = '\0'; + *pp++ = 0; + } + +#define MATCH(line, name) \ + (!strncmp(line, name, sizeof(name) - 1) && \ + (line[sizeof(name) - 1] == ' ' || \ + line[sizeof(name) - 1] == '\t')) + +#ifdef NEXT + if (ircd_netinfo_res_init(&haveenv, &havesearch) == 0) +#endif + if ((fp = fopen(IRC_RESCONF, "r")) != NULL) { + /* read the config file */ + while (fgets(buf, sizeof(buf), fp) != NULL) { + /* skip comments */ + if (*buf == ';' || *buf == '#') + continue; + /* read default domain name */ + if (MATCH(buf, "domain")) { + if (haveenv) /* skip if have from environ */ + continue; + cp = buf + sizeof("domain") - 1; + while (*cp == ' ' || *cp == '\t') + cp++; + if ((*cp == '\0') || (*cp == '\n')) + continue; + strncpyzt(ircd_res.defdname, cp, sizeof(ircd_res.defdname)); + if ((cp = strpbrk(ircd_res.defdname, " \t\n")) != NULL) + *cp = '\0'; + havesearch = 0; + continue; + } + /* set search list */ + if (MATCH(buf, "search")) { + if (haveenv) /* skip if have from environ */ + continue; + cp = buf + sizeof("search") - 1; + while (*cp == ' ' || *cp == '\t') + cp++; + if ((*cp == '\0') || (*cp == '\n')) + continue; + strncpyzt(ircd_res.defdname, cp, sizeof(ircd_res.defdname)); + if ((cp = strchr(ircd_res.defdname, '\n')) != NULL) + *cp = '\0'; + /* + * Set search list to be blank-separated strings + * on rest of line. + */ + cp = ircd_res.defdname; + pp = ircd_res.dnsrch; + *pp++ = cp; + for (n = 0; *cp && pp < ircd_res.dnsrch + MAXDNSRCH; cp++) { + if (*cp == ' ' || *cp == '\t') { + *cp = 0; + n = 1; + } else if (n) { + *pp++ = cp; + n = 0; + } + } + /* null terminate last domain if there are excess */ + while (*cp != '\0' && *cp != ' ' && *cp != '\t') + cp++; + *cp = '\0'; + *pp++ = 0; + havesearch = 1; + continue; + } + /* read nameservers to query */ + if (MATCH(buf, "nameserver") && nserv < MAXNS) { + struct in_addr a; + + cp = buf + sizeof("nameserver") - 1; + while (*cp == ' ' || *cp == '\t') + cp++; + if ((*cp != '\0') && (*cp != '\n') && inetaton(cp, &a)) { + ircd_res.nsaddr_list[nserv].sin_addr = a; + ircd_res.nsaddr_list[nserv].sin_family = AF_INET; + ircd_res.nsaddr_list[nserv].sin_port = + htons(NAMESERVER_PORT); + nserv++; + } + continue; + } +#ifdef RESOLVSORT + if (MATCH(buf, "sortlist")) { + struct in_addr a; + + cp = buf + sizeof("sortlist") - 1; + while (nsort < MAXRESOLVSORT) { + while (*cp == ' ' || *cp == '\t') + cp++; + if (*cp == '\0' || *cp == '\n' || *cp == ';') + break; + net = cp; + while (*cp && !ISSORTMASK(*cp) && *cp != ';' && + isascii(*cp) && !isspace(*cp)) + cp++; + n = *cp; + *cp = 0; + if (inetaton(net, &a)) { + ircd_res.sort_list[nsort].addr = a; + if (ISSORTMASK(n)) { + *cp++ = n; + net = cp; + while (*cp && *cp != ';' && + isascii(*cp) && !isspace(*cp)) + cp++; + n = *cp; + *cp = 0; + if (inetaton(net, &a)) { + ircd_res.sort_list[nsort].mask = a.s_addr; + } else { + ircd_res.sort_list[nsort].mask = + ircd_net_mask(ircd_res.sort_list[nsort].addr); + } + } else { + ircd_res.sort_list[nsort].mask = + ircd_net_mask(ircd_res.sort_list[nsort].addr); + } + nsort++; + } + *cp = n; + } + continue; + } +#endif + if (MATCH(buf, "options")) { + ircd_res_setoptions(buf + sizeof("options") - 1, "conf"); + continue; + } + } + if (nserv > 1) + ircd_res.nscount = nserv; +#ifdef RESOLVSORT + ircd_res.nsort = nsort; +#endif + (void) fclose(fp); + } + if (ircd_res.defdname[0] == 0 && + gethostname(buf, sizeof(ircd_res.defdname) - 1) == 0 && + (cp = strchr(buf, '.')) != NULL) + strcpy(ircd_res.defdname, cp + 1); + + /* find components of local domain that might be searched */ + if (havesearch == 0) { + pp = ircd_res.dnsrch; + *pp++ = ircd_res.defdname; + *pp = NULL; + +#ifndef RFC1535 + dots = 0; + for (cp = ircd_res.defdname; *cp; cp++) + dots += (*cp == '.'); + + cp = ircd_res.defdname; + while (pp < ircd_res.dnsrch + MAXDFLSRCH) { + if (dots < LOCALDOMAINPARTS) + break; + cp = strchr(cp, '.') + 1; /* we know there is one */ + *pp++ = cp; + dots--; + } + *pp = NULL; +#ifdef DEBUG + if (ircd_res.options & RES_DEBUG) { + printf(";; res_init()... default dnsrch list:\n"); + for (pp = ircd_res.dnsrch; *pp; pp++) + printf(";;\t%s\n", *pp); + printf(";;\t..END..\n"); + } +#endif /* DEBUG */ +#endif /* !RFC1535 */ + } + + if ((cp = getenv("RES_OPTIONS")) != NULL) + ircd_res_setoptions(cp, "env"); + ircd_res.options |= RES_INIT; + return (0); +} + +static void +ircd_res_setoptions(options, source) + char *options, *source; +{ + char *cp = options; + int i; + +#ifdef DEBUG + if (ircd_res.options & RES_DEBUG) + printf(";; ircd_res_setoptions(\"%s\", \"%s\")...\n", + options, source); +#endif + while (*cp) { + /* skip leading and inner runs of spaces */ + while (*cp == ' ' || *cp == '\t') + cp++; + /* search for and process individual options */ + if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) { + i = atoi(cp + sizeof("ndots:") - 1); + if (i <= RES_MAXNDOTS) + ircd_res.ndots = i; + else + ircd_res.ndots = RES_MAXNDOTS; +#ifdef DEBUG + if (ircd_res.options & RES_DEBUG) + printf(";;\tndots=%d\n", ircd_res.ndots); +#endif + } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { +#ifdef DEBUG + if (!(ircd_res.options & RES_DEBUG)) { + printf(";; ircd_res_setoptions(\"%s\", \"%s\")..\n", + options, source); + ircd_res.options |= RES_DEBUG; + } + printf(";;\tdebug\n"); +#endif + } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { + ircd_res.options |= RES_USE_INET6; + } else { + /* XXX - print a warning here? */ + } + /* skip to next run of spaces */ + while (*cp && *cp != ' ' && *cp != '\t') + cp++; + } +} + +#ifdef RESOLVSORT +/* XXX - should really support CIDR which means explicit masks always. */ +static u_int32_t +ircd_net_mask(in) /* XXX - should really use system's version of this */ + struct in_addr in; +{ + register u_int32_t i = ntohl(in.s_addr); + + if (IN_CLASSA(i)) + return (htonl(IN_CLASSA_NET)); + else if (IN_CLASSB(i)) + return (htonl(IN_CLASSB_NET)); + return (htonl(IN_CLASSC_NET)); +} +#endif + +#ifdef NEXT +static int +ircd_netinfo_res_init(haveenv, havesearch) + int *haveenv; + int *havesearch; +{ + register int n; + void *domain, *parent; + ni_id dir; + ni_status status; + ni_namelist nl; + int nserv = 0; +#ifdef RESOLVSORT + int nsort = 0; +#endif + + status = ni_open(NULL, ".", &domain); + if (status == NI_OK) { + ni_setreadtimeout(domain, NI_TIMEOUT); + ni_setabort(domain, 1); + + /* climb the NetInfo hierarchy to find a resolver directory */ + while (status == NI_OK) { + status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF); + if (status == NI_OK) { + /* found a resolver directory */ + + if (*haveenv == 0) { + /* get the default domain name */ + status = ni_lookupprop(domain, &dir, "domain", &nl); + if (status == NI_OK && nl.ni_namelist_len > 0) { + (void)strncpy(ircd_res.defdname, + nl.ni_namelist_val[0], + sizeof(ircd_res.defdname) - 1); + ircd_res.defdname[sizeof(ircd_res.defdname) - 1] = '\0'; + ni_namelist_free(&nl); + *havesearch = 0; + } + + /* get search list */ + status = ni_lookupprop(domain, &dir, "search", &nl); + if (status == NI_OK && nl.ni_namelist_len > 0) { + (void)strncpy(ircd_res.defdname, + nl.ni_namelist_val[0], + sizeof(ircd_res.defdname) - 1); + ircd_res.defdname[sizeof(ircd_res.defdname) - 1] = '\0'; + /* copy */ + for (n = 0; + n < nl.ni_namelist_len && n < MAXDNSRCH; + n++) { + /* duplicate up to MAXDNSRCH servers */ + char *cp = nl.ni_namelist_val[n]; + ircd_res.dnsrch[n] = + strcpy((char *)malloc(strlen(cp) + 1), cp); + } + ni_namelist_free(&nl); + *havesearch = 1; + } + } + + /* get list of nameservers */ + status = ni_lookupprop(domain, &dir, "nameserver", &nl); + if (status == NI_OK && nl.ni_namelist_len > 0) { + /* copy up to MAXNS servers */ + for (n = 0; + n < nl.ni_namelist_len && nserv < MAXNS; + n++) { + struct in_addr a; + + if (inetaton(nl.ni_namelist_val[n], &a)) { + ircd_res.nsaddr_list[nserv].sin_addr = a; + ircd_res.nsaddr_list[nserv].sin_family = AF_INET; + ircd_res.nsaddr_list[nserv].sin_port = + htons(NAMESERVER_PORT); + nserv++; + } + } + ni_namelist_free(&nl); + } + + if (nserv > 1) + ircd_res.nscount = nserv; + +#ifdef RESOLVSORT + /* get sort order */ + status = ni_lookupprop(domain, &dir, "sortlist", &nl); + if (status == NI_OK && nl.ni_namelist_len > 0) { + + /* copy up to MAXRESOLVSORT address/netmask pairs */ + for (n = 0; + n < nl.ni_namelist_len && nsort < MAXRESOLVSORT; + n++) { + char ch; + char *cp; + const char *sp; + struct in_addr a; + + cp = NULL; + for (sp = sort_mask; *sp; sp++) { + char *cp1; + cp1 = strchr(nl.ni_namelist_val[n], *sp); + if (cp && cp1) + cp = (cp < cp1)? cp : cp1; + else if (cp1) + cp = cp1; + } + if (cp != NULL) { + ch = *cp; + *cp = '\0'; + break; + } + if (inetaton(nl.ni_namelist_val[n], &a)) { + ircd_res.sort_list[nsort].addr = a; + if (*cp && ISSORTMASK(ch)) { + *cp++ = ch; + if (inetaton(cp, &a)) { + ircd_res.sort_list[nsort].mask = a.s_addr; + } else { + ircd_res.sort_list[nsort].mask = + ircd_net_mask(ircd_res.sort_list[nsort].addr); + } + } else { + ircd_res.sort_list[nsort].mask = + ircd_net_mask(ircd_res.sort_list[nsort].addr); + } + nsort++; + } + } + ni_namelist_free(&nl); + } + + ircd_res.nsort = nsort; +#endif + + /* get resolver options */ + status = ni_lookupprop(domain, &dir, "options", &nl); + if (status == NI_OK && nl.ni_namelist_len > 0) { + ircd_res_setoptions(nl.ni_namelist_val[0], "conf"); + ni_namelist_free(&nl); + } + + ni_free(domain); + return(1); /* using DNS configuration from NetInfo */ + } + + status = ni_open(domain, "..", &parent); + ni_free(domain); + if (status == NI_OK) + domain = parent; + } + } + return(0); /* if not using DNS configuration from NetInfo */ +} +#endif /* NEXT */ + +u_int +ircd_res_randomid() +{ + struct timeval now; + + gettimeofday(&now, NULL); + return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); +} |