diff options
Diffstat (limited to 'contrib/isc-dhcp/minires/res_init.c')
| -rw-r--r-- | contrib/isc-dhcp/minires/res_init.c | 486 |
1 files changed, 486 insertions, 0 deletions
diff --git a/contrib/isc-dhcp/minires/res_init.c b/contrib/isc-dhcp/minires/res_init.c new file mode 100644 index 000000000000..b646b8ec0eef --- /dev/null +++ b/contrib/isc-dhcp/minires/res_init.c @@ -0,0 +1,486 @@ +/* + * 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. + */ + +/* + * 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 + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93"; +static const char rcsid[] = "$Id: res_init.c,v 1.4.2.1 2001/06/22 02:57:54 mellon Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/time.h> + +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <ctype.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "minires/minires.h" +#include "arpa/nameser.h" + +/* Options. Should all be left alone. */ +#define RESOLVSORT +#define RFC1535 +#define DEBUG + +static void res_setoptions (res_state, const char *, const char *); + +#ifdef RESOLVSORT +static const char sort_mask[] = "/&"; +#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) +static u_int32_t net_mask (struct in_addr); +#endif + +#if !defined(isascii) /* XXX - could be a function */ +# define isascii(c) (!(c & 0200)) +#endif + +/* + * Resolver state default settings. + */ + +/* + * 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 + */ +extern int minires_vinit(res_state, int); + +#if defined (TRACING) +u_int trace_mr_res_randomid(u_int); +#endif + +int +res_ninit(res_state statp) { + + return (minires_vinit(statp, 0)); +} + +/* This function has to be reachable by res_data.c but not publically. */ +int +minires_vinit(res_state statp, int preinit) { + register FILE *fp; + register char *cp, **pp; + register int n; + char buf[BUFSIZ]; + 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 + + if (!preinit) { + statp->retrans = RES_TIMEOUT; + statp->retry = RES_DFLRETRY; + statp->options = RES_DEFAULT; + statp->id = res_randomid(); +#if defined (TRACING) + statp->id = trace_mr_res_randomid (statp -> id); +#endif + } + +#ifdef USELOOPBACK + statp->nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); +#else + statp->nsaddr.sin_addr.s_addr = INADDR_ANY; +#endif + statp->nsaddr.sin_family = AF_INET; + statp->nsaddr.sin_port = htons(NAMESERVER_PORT); + statp->nscount = 1; + statp->ndots = 1; + statp->pfcode = 0; + statp->_sock = -1; + statp->_flags = 0; + statp->qhook = NULL; + statp->rhook = NULL; + + /* Allow user to override the local domain definition */ + if ((cp = getenv("LOCALDOMAIN")) != NULL) { + (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); + statp->defdname[sizeof(statp->defdname) - 1] = '\0'; + 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 = statp->defdname; + pp = statp->dnsrch; + *pp++ = cp; + for (n = 0; *cp && pp < statp->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')) + + if ((fp = fopen(_PATH_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; + strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); + statp->defdname[sizeof(statp->defdname) - 1] = '\0'; + if ((cp = strpbrk(statp->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; + strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1); + statp->defdname[sizeof(statp->defdname) - 1] = '\0'; + if ((cp = strchr(statp->defdname, '\n')) != NULL) + *cp = '\0'; + /* + * Set search list to be blank-separated strings + * on rest of line. + */ + cp = statp->defdname; + pp = statp->dnsrch; + *pp++ = cp; + for (n = 0; *cp && pp < statp->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') && inet_aton(cp, &a)) { + statp->nsaddr_list[nserv].sin_addr = a; + statp->nsaddr_list[nserv].sin_family = AF_INET; + statp->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 (inet_aton(net, &a)) { + statp->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 (inet_aton(net, &a)) { + statp->sort_list[nsort].mask = a.s_addr; + } else { + statp->sort_list[nsort].mask = + net_mask(statp->sort_list[nsort].addr); + } + } else { + statp->sort_list[nsort].mask = + net_mask(statp->sort_list[nsort].addr); + } + nsort++; + } + *cp = n; + } + continue; + } +#endif + if (MATCH(buf, "options")) { + res_setoptions(statp, buf + sizeof("options") - 1, "conf"); + continue; + } + } + if (nserv > 1) + statp->nscount = nserv; +#ifdef RESOLVSORT + statp->nsort = nsort; +#endif + (void) fclose(fp); + } + if (statp->defdname[0] == 0 && + gethostname(buf, sizeof(statp->defdname) - 1) == 0 && + (cp = strchr(buf, '.')) != NULL) + strcpy(statp->defdname, cp + 1); + + /* find components of local domain that might be searched */ + if (havesearch == 0) { + pp = statp->dnsrch; + *pp++ = statp->defdname; + *pp = NULL; + +#ifndef RFC1535 + dots = 0; + for (cp = statp->defdname; *cp; cp++) + dots += (*cp == '.'); + + cp = statp->defdname; + while (pp < statp->dnsrch + MAXDFLSRCH) { + if (dots < LOCALDOMAINPARTS) + break; + cp = strchr(cp, '.') + 1; /* we know there is one */ + *pp++ = cp; + dots--; + } + *pp = NULL; +#ifdef DEBUG + if (statp->options & RES_DEBUG) { + printf(";; res_init()... default dnsrch list:\n"); + for (pp = statp->dnsrch; *pp; pp++) + printf(";;\t%s\n", *pp); + printf(";;\t..END..\n"); + } +#endif +#endif /* !RFC1535 */ + } + + if ((cp = getenv("RES_OPTIONS")) != NULL) + res_setoptions(statp, cp, "env"); + statp->options |= RES_INIT; + return (0); +} + +static void +res_setoptions(res_state statp, const char *options, const char *source) { + const char *cp = options; + int i; + +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";; 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) + statp->ndots = i; + else + statp->ndots = RES_MAXNDOTS; +#ifdef DEBUG + if (statp->options & RES_DEBUG) + printf(";;\tndots=%d\n", statp->ndots); +#endif + } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) { + i = atoi(cp + sizeof("timeout:") - 1); + if (i <= RES_MAXRETRANS) + statp->retrans = i; + else + statp->retrans = RES_MAXRETRANS; + } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){ + i = atoi(cp + sizeof("attempts:") - 1); + if (i <= RES_MAXRETRY) + statp->retry = i; + else + statp->retry = RES_MAXRETRY; + } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) { +#ifdef DEBUG + if (!(statp->options & RES_DEBUG)) { + printf(";; res_setoptions(\"%s\", \"%s\")..\n", + options, source); + statp->options |= RES_DEBUG; + } + printf(";;\tdebug\n"); +#endif + } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) { + statp->options |= RES_USE_INET6; + } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) { + statp->options |= RES_ROTATE; + } else if (!strncmp(cp, "no-check-names", + sizeof("no-check-names") - 1)) { + statp->options |= RES_NOCHECKNAME; + } 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 +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 + +u_int +res_randomid(void) { + struct timeval now; + + gettimeofday(&now, NULL); + return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); +} |