initial import of NetBSD tree

1 files changed, 366 insertions, 0 deletions

diff --git a/src/lib/libc/net/res_query.c b/src/lib/libc/net/res_query.c
new file mode 100644
index 0000000000..7649462e56
--- /dev/null
+++ b/src/lib/libc/net/res_query.c
@@ -0,0 +1,366 @@
+/*      $NetBSD: res_query.c,v 1.9 1995/02/25 06:58:58 cgd Exp $        */
+
+/*-
+ * Copyright (c) 1988, 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)
+#if 0
+static char sccsid[] = "@(#)res_query.c 8.1 (Berkeley) 6/4/93";
+static char rcsid[] = "$Id: res_query.c,v 1.1 1993/06/01 09:42:14 vixie Exp vixie ";
+#else
+static char rcsid[] = "$NetBSD: res_query.c,v 1.9 1995/02/25 06:58:58 cgd Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <netdb.h>
+#include <resolv.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if PACKETSZ > 1024
+#define MAXPACKET       PACKETSZ
+#else
+#define MAXPACKET       1024
+#endif
+
+char *__hostalias __P((const char *));
+int h_errno;
+
+/*
+ * Formulate a normal query, send, and await answer.
+ * Returned answer is placed in supplied buffer "answer".
+ * Perform preliminary check of answer, returning success only
+ * if no error is indicated and the answer count is nonzero.
+ * Return the size of the response on success, -1 on error.
+ * Error number is left in h_errno.
+ * Caller must parse answer and determine whether it answers the question.
+ */
+res_query(name, class, type, answer, anslen)
+        char *name;             /* domain name */
+        int class, type;        /* class and type of query */
+        u_char *answer;         /* buffer to put answer */
+        int anslen;             /* size of answer buffer */
+{
+        char buf[MAXPACKET];
+        HEADER *hp;
+        int n;
+
+        if ((_res.options & RES_INIT) == 0 && res_init() == -1)
+                return (-1);
+#ifdef DEBUG
+        if (_res.options & RES_DEBUG)
+                printf(";; res_query(%s, %d, %d)\n", name, class, type);
+#endif
+        n = res_mkquery(QUERY, name, class, type, (char *)NULL, 0, NULL,
+            buf, sizeof(buf));
+
+        if (n <= 0) {
+#ifdef DEBUG
+                if (_res.options & RES_DEBUG)
+                        printf(";; res_query: mkquery failed\n");
+#endif
+                h_errno = NO_RECOVERY;
+                return (n);
+        }
+        n = res_send(buf, n, (char *)answer, anslen);
+        if (n < 0) {
+#ifdef DEBUG
+                if (_res.options & RES_DEBUG)
+                        printf(";; res_query: send error\n");
+#endif
+                h_errno = TRY_AGAIN;
+                return (n);
+        }
+
+        hp = (HEADER *) answer;
+        if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
+#ifdef DEBUG
+                if (_res.options & RES_DEBUG)
+                        printf(";; rcode = %d, ancount=%d\n", hp->rcode,
+                            ntohs(hp->ancount));
+#endif
+                switch (hp->rcode) {
+                        case NXDOMAIN:
+                                h_errno = HOST_NOT_FOUND;
+                                break;
+                        case SERVFAIL:
+                                h_errno = TRY_AGAIN;
+                                break;
+                        case NOERROR:
+                                h_errno = NO_DATA;
+                                break;
+                        case FORMERR:
+                        case NOTIMP:
+                        case REFUSED:
+                        default:
+                                h_errno = NO_RECOVERY;
+                                break;
+                }
+                return (-1);
+        }
+        return (n);
+}
+
+/*
+ * Formulate a normal query, send, and retrieve answer in supplied buffer.
+ * Return the size of the response on success, -1 on error.
+ * If enabled, implement search rules until answer or unrecoverable failure
+ * is detected.  Error number is left in h_errno.
+ * Only useful for queries in the same name hierarchy as the local host
+ * (not, for example, for host address-to-name lookups in domain in-addr.arpa).
+ */
+int
+res_search(name, class, type, answer, anslen)
+        const char *name;       /* domain name */
+        int class, type;        /* class and type of query */
+        u_char *answer;         /* buffer to put answer */
+        int anslen;             /* size of answer */
+{
+        register char *cp, **domain;
+        int dots, trailing_dot, ret, got_nodata, saved_herrno, tried_as_is;
+
+        if ((_res.options & RES_INIT) == 0 && res_init() == -1)
+                return (-1);
+
+        got_nodata = 0;
+        errno = 0;
+        h_errno = HOST_NOT_FOUND;       /* default, if we never query */
+        dots = 0;
+        for (cp = (char *)name; *cp; cp++) {
+                if (*cp == '.')
+                        dots++;
+        }
+        trailing_dot = 0;
+        if ((cp > name) && (*--cp == '.'))
+                trailing_dot++;
+
+        /*
+         * if there aren't any dots, it could be a user-level alias
+         */
+        if (!dots && (cp = __hostalias(name)))
+                return (res_query(cp, class, type, answer, anslen));
+
+        /*
+         * If there are dots in the name already, let's just give it a try
+         * 'as is'.  The threshold can be set with the "ndots" option.
+         */
+        saved_herrno = -1;
+        tried_as_is = 0;
+        if (dots >= _res.ndots) {
+                ret = res_querydomain(name, NULL, class, type, answer, anslen);
+                if (ret > 0)
+                        return (ret);
+                saved_herrno = h_errno;
+                tried_as_is++;
+        }
+
+        /*
+         * We do at least one level of search if
+         *      - there is no dot and RES_DEFNAME is set, or
+         *      - there is at least one dot, there is no trailing dot,
+         *        and RES_DNSRCH is set.
+         */
+        if ((!dots && (_res.options & RES_DEFNAMES)) ||
+            (dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
+                for (domain = _res.dnsrch; *domain; domain++) {
+                        int done = 0;
+
+                        ret = res_querydomain(name, *domain, class, type,
+                            answer, anslen);
+                        if (ret > 0)
+                                return (ret);
+                        /*
+                         * If no server present, give up.
+                         * If name isn't found in this domain,
+                         * keep trying higher domains in the search list
+                         * (if that's enabled).
+                         * On a NO_DATA error, keep trying, otherwise
+                         * a wildcard entry of another type could keep us
+                         * from finding this entry higher in the domain.
+                         * If we get some other error (negative answer or
+                         * server failure), then stop searching up,
+                         * but try the input name below in case it's
+                         * fully-qualified.
+                         */
+                        if (errno == ECONNREFUSED) {
+                                h_errno = TRY_AGAIN;
+                                return (-1);
+                        }
+
+                        switch (h_errno) {
+                        case NO_DATA:
+                                got_nodata++;
+                                /* FALLTHROUGH */
+                        case HOST_NOT_FOUND:
+                                /* keep trying */
+                                break;
+                        default:
+                                /* anything else implies that we're done */
+                                done++;
+                        }
+                        /*
+                         * if we got here for some reason other than DNSRCH,
+                         * we only wanted one iteration of the loop, so stop.
+                         */
+                        if (!(_res.options & RES_DNSRCH))
+                                done++;
+
+                        if (done)
+                                break;
+                }
+        }
+
+        /*
+         * if we have not already tried the name "as is", do that now.
+         * note that we do this regardless of how many dots were in the
+         * name or whether it ends with a dot.
+         */
+        if (!tried_as_is) {
+                ret = res_querydomain(name, NULL, class, type, answer, anslen);
+                if (ret > 0)
+                        return (ret);
+                saved_herrno = h_errno;
+        }
+
+        /*
+         * if we got here, we didn't satisfy the search.
+         * if we did an initial full query, return that query's h_errno
+         * (note that we wouldn't be here if that query had succeeded).
+         * else if we ever got a nodata, send that back as the reason.
+         * else send back meaningless h_errno, that being the one from
+         * the last DNSRCH we did.
+         */
+        if (saved_herrno != -1)
+                h_errno = saved_herrno;
+        else if (got_nodata)
+                h_errno = NO_DATA;
+        return (-1);
+}
+
+/*
+ * Perform a call on res_query on the concatenation of name and domain,
+ * removing a trailing dot from name if domain is NULL.
+ */
+res_querydomain(name, domain, class, type, answer, anslen)
+        char *name, *domain;
+        int class, type;        /* class and type of query */
+        u_char *answer;         /* buffer to put answer */
+        int anslen;             /* size of answer */
+{
+        char nbuf[2*MAXDNAME+2];
+        char *longname = nbuf;
+        int n;
+
+#ifdef DEBUG
+        if (_res.options & RES_DEBUG)
+                printf(";; res_querydomain(%s, %s, %d, %d)\n",
+                    name, domain, class, type);
+#endif
+        if (domain == NULL) {
+                /*
+                 * Check for trailing '.';
+                 * copy without '.' if present.
+                 */
+                n = strlen(name) - 1;
+                if (n != (0 - 1) && name[n] == '.' && n < sizeof(nbuf) - 1) {
+                        bcopy(name, nbuf, n);
+                        nbuf[n] = '\0';
+                } else
+                        longname = name;
+        } else
+                (void)sprintf(nbuf, "%.*s.%.*s",
+                    MAXDNAME, name, MAXDNAME, domain);
+
+        return (res_query(longname, class, type, answer, anslen));
+}
+
+char *
+__hostalias(name)
+        register const char *name;
+{
+        register char *cp1, *cp2;
+        FILE *fp;
+        char *file, *getenv(), *strcpy(), *strncpy();
+        char buf[BUFSIZ];
+        static char abuf[MAXDNAME];
+
+        file = getenv("HOSTALIASES");
+        if (file == NULL || (fp = fopen(file, "r")) == NULL)
+                return (NULL);
+        buf[sizeof(buf) - 1] = '\0';
+        while (fgets(buf, sizeof(buf), fp)) {
+                for (cp1 = buf; *cp1 && !isspace(*cp1); ++cp1);
+                if (!*cp1)
+                        break;
+                *cp1 = '\0';
+                if (!strcasecmp(buf, name)) {
+                        while (isspace(*++cp1));
+                        if (!*cp1)
+                                break;
+                        for (cp2 = cp1 + 1; *cp2 && !isspace(*cp2); ++cp2);
+                        abuf[sizeof(abuf) - 1] = *cp2 = '\0';
+                        (void)strncpy(abuf, cp1, sizeof(abuf) - 1);
+                        fclose(fp);
+                        return (abuf);
+                }
+        }
+        fclose(fp);
+        return (NULL);
+}