netbsd: bind 4.9.3

1 files changed, 52 insertions, 21 deletions

diff --git a/src/lib/libc/net/res_query.c b/src/lib/libc/net/res_query.c
index 7649462e56..81c4d3194d 100644
--- a/src/lib/libc/net/res_query.c
+++ b/src/lib/libc/net/res_query.c
@@ -1,4 +1,4 @@
-/*      $NetBSD: res_query.c,v 1.9 1995/02/25 06:58:58 cgd Exp $        */
+/*      $NetBSD: res_query.c,v 1.10 1996/02/02 15:22:34 mrg Exp $       */
 
 /*-
  * Copyright (c) 1988, 1993
@@ -56,9 +56,9 @@
 #if defined(LIBC_SCCS) && !defined(lint)
 #if 0
 static char sccsid[] = "@(#)res_query.c 8.1 (Berkeley) 6/4/93";
-static char rcsid[] = "$Id: res_query.c,v 1.1 1993/06/01 09:42:14 vixie Exp vixie ";
+static char rcsid[] = "$Id: res_query.c,v 8.6 1995/06/29 09:26:28 vixie Exp ";
 #else
-static char rcsid[] = "$NetBSD: res_query.c,v 1.9 1995/02/25 06:58:58 cgd Exp $";
+static char rcsid[] = "$NetBSD: res_query.c,v 1.10 1996/02/02 15:22:34 mrg Exp $";
 #endif
 #endif /* LIBC_SCCS and not lint */
 
@@ -90,27 +90,33 @@ int h_errno;
  * 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.
  */
+int
 res_query(name, class, type, answer, anslen)
-        char *name;             /* domain name */
+        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 buffer */
 {
-        char buf[MAXPACKET];
-        HEADER *hp;
+        u_char buf[MAXPACKET];
+        register HEADER *hp = (HEADER *) answer;
         int n;
 
-        if ((_res.options & RES_INIT) == 0 && res_init() == -1)
+        hp->rcode = NOERROR;    /* default */
+
+        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+                h_errno = NETDB_INTERNAL;
                 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));
 
+        n = res_mkquery(QUERY, name, class, type, NULL, 0, NULL,
+            buf, sizeof(buf));
         if (n <= 0) {
 #ifdef DEBUG
                 if (_res.options & RES_DEBUG)
@@ -119,7 +125,7 @@ res_query(name, class, type, answer, anslen)
                 h_errno = NO_RECOVERY;
                 return (n);
         }
-        n = res_send(buf, n, (char *)answer, anslen);
+        n = res_send(buf, n, answer, anslen);
         if (n < 0) {
 #ifdef DEBUG
                 if (_res.options & RES_DEBUG)
@@ -174,10 +180,15 @@ res_search(name, class, type, answer, anslen)
         int anslen;             /* size of answer */
 {
         register char *cp, **domain;
-        int dots, trailing_dot, ret, got_nodata, saved_herrno, tried_as_is;
+        HEADER *hp = (HEADER *) answer;
+        u_int dots;
+        int trailing_dot, ret, saved_herrno;
+        int got_nodata = 0, got_servfail = 0, tried_as_is = 0;
 
-        if ((_res.options & RES_INIT) == 0 && res_init() == -1)
+        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+                h_errno = NETDB_INTERNAL;
                 return (-1);
+        }
 
         got_nodata = 0;
         errno = 0;
@@ -188,13 +199,13 @@ res_search(name, class, type, answer, anslen)
                         dots++;
         }
         trailing_dot = 0;
-        if ((cp > name) && (*--cp == '.'))
+        if (cp > name && *--cp == '.')
                 trailing_dot++;
 
         /*
          * if there aren't any dots, it could be a user-level alias
          */
-        if (!dots && (cp = __hostalias(name)))
+        if (!dots && (cp = __hostalias(name)) != NULL)
                 return (res_query(cp, class, type, answer, anslen));
 
         /*
@@ -251,6 +262,13 @@ res_search(name, class, type, answer, anslen)
                         case HOST_NOT_FOUND:
                                 /* keep trying */
                                 break;
+                        case TRY_AGAIN:
+                                if (hp->rcode == SERVFAIL) {
+                                        /* try next search element, if any */
+                                        got_servfail++;
+                                        break;
+                                }
+                                /* FALLTHROUGH */
                         default:
                                 /* anything else implies that we're done */
                                 done++;
@@ -291,6 +309,8 @@ res_search(name, class, type, answer, anslen)
                 h_errno = saved_herrno;
         else if (got_nodata)
                 h_errno = NO_DATA;
+        else if (got_servfail)
+                h_errno = TRY_AGAIN;
         return (-1);
 }
 
@@ -298,20 +318,25 @@ res_search(name, class, type, answer, anslen)
  * Perform a call on res_query on the concatenation of name and domain,
  * removing a trailing dot from name if domain is NULL.
  */
+int
 res_querydomain(name, domain, class, type, answer, anslen)
-        char *name, *domain;
+        const 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;
+        const char *longname = nbuf;
         int n;
 
+        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+                h_errno = NETDB_INTERNAL;
+                return (-1);
+        }
 #ifdef DEBUG
         if (_res.options & RES_DEBUG)
                 printf(";; res_querydomain(%s, %s, %d, %d)\n",
-                    name, domain, class, type);
+                        name, domain?domain:"<Nil>", class, type);
 #endif
         if (domain == NULL) {
                 /*
@@ -337,24 +362,30 @@ __hostalias(name)
 {
         register char *cp1, *cp2;
         FILE *fp;
-        char *file, *getenv(), *strcpy(), *strncpy();
+        char *file;
         char buf[BUFSIZ];
         static char abuf[MAXDNAME];
 
+        if (_res.options & RES_NOALIASES)
+                return (NULL);
         file = getenv("HOSTALIASES");
         if (file == NULL || (fp = fopen(file, "r")) == NULL)
                 return (NULL);
+        setbuf(fp, NULL);
         buf[sizeof(buf) - 1] = '\0';
         while (fgets(buf, sizeof(buf), fp)) {
-                for (cp1 = buf; *cp1 && !isspace(*cp1); ++cp1);
+                for (cp1 = buf; *cp1 && !isspace(*cp1); ++cp1)
+                        ;
                 if (!*cp1)
                         break;
                 *cp1 = '\0';
                 if (!strcasecmp(buf, name)) {
-                        while (isspace(*++cp1));
+                        while (isspace(*++cp1))
+                                ;
                         if (!*cp1)
                                 break;
-                        for (cp2 = cp1 + 1; *cp2 && !isspace(*cp2); ++cp2);
+                        for (cp2 = cp1 + 1; *cp2 && !isspace(*cp2); ++cp2)
+                                ;
                         abuf[sizeof(abuf) - 1] = *cp2 = '\0';
                         (void)strncpy(abuf, cp1, sizeof(abuf) - 1);
                         fclose(fp);