Part of bind-4.9.3-rel.. This is for my convenience and reference.

This import to the vendor branch changes no files...

1 files changed, 471 insertions, 46 deletions

diff --git a/lib/libc/net/res_init.c b/lib/libc/net/res_init.c
index 1e0fd05..c1f120d 100644
--- a/lib/libc/net/res_init.c
+++ b/lib/libc/net/res_init.c
@@ -1,7 +1,9 @@
-/*-
+/*
+ * ++Copyright++ 1985, 1989, 1993
+ * -
  * Copyright (c) 1985, 1989, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
+ *    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:
@@ -12,12 +14,12 @@
  *    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.
+ * 	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
@@ -53,41 +55,100 @@
 
 #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 4.9.1.1 1993/05/02 22:43:03 vixie Rel $";
+static char rcsid[] = "$Id: res_init.c,v 8.3 1995/06/29 09:26:28 vixie Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
 #include <sys/socket.h>
+#include <sys/time.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <arpa/nameser.h>
-#include <resolv.h>
-#include <unistd.h>
+
 #include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include <ctype.h>
+#include <resolv.h>
+#if defined(BSD) && (BSD >= 199103)
+# include <unistd.h>
+# include <stdlib.h>
+# include <string.h>
+#else
+# include "../conf/portability.h"
+#endif
+
+/*-------------------------------------- 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)
+#  include <netinfo/ni.h>
+#  define NI_PATH_RESCONF "/locations/resolver"
+#  define NI_TIMEOUT 10
+static int netinfo_res_init __P((int *haveenv, int *havesearch));
+#endif
+
+#if defined(USE_OPTIONS_H)
+# include "../conf/options.h"
+#endif
+
+static void res_setoptions __P((char *, char *));
+
+#ifdef RESOLVSORT
+static const char sort_mask[] = "/&";
+#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
+static u_int32_t net_mask __P((struct in_addr));
+#endif
+
+#if !defined(isascii)	/* XXX - could be a function */
+# define isascii(c) (!(c & 0200))
+#endif
 
 /*
- * Resolver state default settings
+ * Resolver state default settings.
  */
 
-struct __res_state _res = {
-	RES_TIMEOUT,               	/* retransmition time interval */
-	4,                         	/* number of times to retransmit */
-	RES_DEFAULT,			/* options flags */
-	1,                         	/* number of name servers */
-};
+struct __res_state _res;
 
 /*
  * 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().
  *
- * The configuration file should only be used if you want to redefine your
- * domain or run without a server on your machine.
+ * 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
 res_init()
 {
 	register FILE *fp;
@@ -97,6 +158,46 @@ res_init()
 	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 (!_res.retrans)
+		_res.retrans = RES_TIMEOUT;
+	if (!_res.retry)
+		_res.retry = 4;
+	if (!(_res.options & RES_INIT))
+		_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 (!_res.id)
+		_res.id = res_randomid();
 
 #ifdef USELOOPBACK
 	_res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
@@ -106,24 +207,59 @@ res_init()
 	_res.nsaddr.sin_family = AF_INET;
 	_res.nsaddr.sin_port = htons(NAMESERVER_PORT);
 	_res.nscount = 1;
+	_res.ndots = 1;
 	_res.pfcode = 0;
 
 	/* Allow user to override the local domain definition */
 	if ((cp = getenv("LOCALDOMAIN")) != NULL) {
-		(void)strncpy(_res.defdname, cp, sizeof(_res.defdname));
-		if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
-			*cp = '\0';
+		(void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 		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 = _res.defdname;
+		pp = _res.dnsrch;
+		*pp++ = cp;
+		for (n = 0; *cp && pp < _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 (netinfo_res_init(&haveenv, &havesearch) == 0)
+#endif
 	if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
 	    /* read the config file */
 	    while (fgets(buf, sizeof(buf), fp) != NULL) {
 		/* skip comments */
-		if ((*buf == ';') || (*buf == '#'))
+		if (*buf == ';' || *buf == '#')
 			continue;
 		/* read default domain name */
-		if (!strncmp(buf, "domain", sizeof("domain") - 1)) {
+		if (MATCH(buf, "domain")) {
 		    if (haveenv)	/* skip if have from environ */
 			    continue;
 		    cp = buf + sizeof("domain") - 1;
@@ -131,15 +267,14 @@ res_init()
 			    cp++;
 		    if ((*cp == '\0') || (*cp == '\n'))
 			    continue;
-		    (void)strncpy(_res.defdname, cp,
-				  sizeof(_res.defdname) - 1);
+		    strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 		    if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
 			    *cp = '\0';
 		    havesearch = 0;
 		    continue;
 		}
 		/* set search list */
-		if (!strncmp(buf, "search", sizeof("search") - 1)) {
+		if (MATCH(buf, "search")) {
 		    if (haveenv)	/* skip if have from environ */
 			    continue;
 		    cp = buf + sizeof("search") - 1;
@@ -147,8 +282,7 @@ res_init()
 			    cp++;
 		    if ((*cp == '\0') || (*cp == '\n'))
 			    continue;
-		    (void)strncpy(_res.defdname, cp,
-				  sizeof(_res.defdname) - 1);
+		    strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
 		    if ((cp = strchr(_res.defdname, '\n')) != NULL)
 			    *cp = '\0';
 		    /*
@@ -176,9 +310,8 @@ res_init()
 		    continue;
 		}
 		/* read nameservers to query */
-		if (!strncmp(buf, "nameserver", sizeof("nameserver") - 1) &&
-		   nserv < MAXNS) {
-		   struct in_addr a;
+		if (MATCH(buf, "nameserver") && nserv < MAXNS) {
+		    struct in_addr a;
 
 		    cp = buf + sizeof("nameserver") - 1;
 		    while (*cp == ' ' || *cp == '\t')
@@ -192,32 +325,324 @@ res_init()
 		    }
 		    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)) {
+			    _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 (inet_aton(net, &a)) {
+				    _res.sort_list[nsort].mask = a.s_addr;
+				} else {
+				    _res.sort_list[nsort].mask = 
+					net_mask(_res.sort_list[nsort].addr);
+				}
+			    } else {
+				_res.sort_list[nsort].mask = 
+				    net_mask(_res.sort_list[nsort].addr);
+			    }
+			    nsort++;
+			}
+			*cp = n;
+		    }
+		    continue;
+		}
+#endif
+		if (MATCH(buf, "options")) {
+		    res_setoptions(buf + sizeof("options") - 1, "conf");
+		    continue;
+		}
 	    }
 	    if (nserv > 1) 
 		_res.nscount = nserv;
+#ifdef RESOLVSORT
+	    _res.nsort = nsort;
+#endif
 	    (void) fclose(fp);
 	}
-	if (_res.defdname[0] == 0) {
-		if (gethostname(buf, sizeof(_res.defdname)) == 0 &&
-		   (cp = strchr(buf, '.')))
-			(void)strcpy(_res.defdname, cp + 1);
-	}
+	if (_res.defdname[0] == 0 &&
+	    gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
+	    (cp = strchr(buf, '.')) != NULL)
+		strcpy(_res.defdname, cp + 1);
 
 	/* find components of local domain that might be searched */
 	if (havesearch == 0) {
 		pp = _res.dnsrch;
 		*pp++ = _res.defdname;
-		for (cp = _res.defdname, n = 0; *cp; cp++)
-			if (*cp == '.')
-				n++;
+		*pp = NULL;
+
+#ifndef RFC1535
+		dots = 0;
+		for (cp = _res.defdname; *cp; cp++)
+			dots += (*cp == '.');
+
 		cp = _res.defdname;
-		for (; n >= LOCALDOMAINPARTS && pp < _res.dnsrch + MAXDFLSRCH;
-		    n--) {
-			cp = strchr(cp, '.');
-			*pp++ = ++cp;
+		while (pp < _res.dnsrch + MAXDFLSRCH) {
+			if (dots < LOCALDOMAINPARTS)
+				break;
+			cp = strchr(cp, '.') + 1;    /* we know there is one */
+			*pp++ = cp;
+			dots--;
 		}
-		*pp++ = 0;
+		*pp = NULL;
+#ifdef DEBUG
+		if (_res.options & RES_DEBUG) {
+			printf(";; res_init()... default dnsrch list:\n");
+			for (pp = _res.dnsrch; *pp; pp++)
+				printf(";;\t%s\n", *pp);
+			printf(";;\t..END..\n");
+		}
+#endif /* DEBUG */
+#endif /* !RFC1535 */
 	}
+
+	if ((cp = getenv("RES_OPTIONS")) != NULL)
+		res_setoptions(cp, "env");
 	_res.options |= RES_INIT;
 	return (0);
 }
+
+static void
+res_setoptions(options, source)
+	char *options, *source;
+{
+	char *cp = options;
+	int i;
+
+#ifdef DEBUG
+	if (_res.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)
+				_res.ndots = i;
+			else
+				_res.ndots = RES_MAXNDOTS;
+#ifdef DEBUG
+			if (_res.options & RES_DEBUG)
+				printf(";;\tndots=%d\n", _res.ndots);
+#endif
+		} else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
+#ifdef DEBUG
+			if (!(_res.options & RES_DEBUG)) {
+				printf(";; res_setoptions(\"%s\", \"%s\")..\n",
+				       options, source);
+				_res.options |= RES_DEBUG;
+			}
+			printf(";;\tdebug\n");
+#endif
+		} 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
+
+#ifdef	NeXT
+static int
+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(_res.defdname,
+				      nl.ni_namelist_val[0],
+				      sizeof(_res.defdname) - 1);
+			_res.defdname[sizeof(_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(_res.defdname,
+				      nl.ni_namelist_val[0],
+				      sizeof(_res.defdname) - 1);
+			_res.defdname[sizeof(_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];
+			    _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 (inet_aton(nl.ni_namelist_val[n], &a)) {
+			    _res.nsaddr_list[nserv].sin_addr = a;
+			    _res.nsaddr_list[nserv].sin_family = AF_INET;
+			    _res.nsaddr_list[nserv].sin_port =
+				htons(NAMESERVER_PORT);
+			    nserv++;
+			}
+		    }
+		    ni_namelist_free(&nl);
+		}
+		
+		if (nserv > 1)
+		    _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 (inet_aton(nl.ni_namelist_val[n], &a)) {
+			    _res.sort_list[nsort].addr = a;
+			    if (*cp && ISSORTMASK(ch)) {
+			    	*cp++ = ch;
+			        if (inet_aton(cp, &a)) {
+				    _res.sort_list[nsort].mask = a.s_addr;
+				} else {
+				    _res.sort_list[nsort].mask =
+					net_mask(_res.sort_list[nsort].addr);
+				}
+			    } else {
+				_res.sort_list[nsort].mask =
+				    net_mask(_res.sort_list[nsort].addr);
+			    }
+			    nsort++;
+			}
+		    }
+		    ni_namelist_free(&nl);
+		}
+
+		_res.nsort = nsort;
+#endif
+
+		/* get resolver options */
+		status = ni_lookupprop(domain, &dir, "options", &nl);
+		if (status == NI_OK && nl.ni_namelist_len > 0) {
+		    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_int16_t
+res_randomid()
+{
+	struct timeval now;
+
+	gettimeofday(&now, NULL);
+	return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
+}