fix copyright and condition notice for new sccs include

[unix-history] / usr / src / lib / libc / net / res_comp.c

diff --git a/usr/src/lib/libc/net/res_comp.c b/usr/src/lib/libc/net/res_comp.c
index 477a78a..155dfab 100644 (file)
--- a/usr/src/lib/libc/net/res_comp.c
+++ b/usr/src/lib/libc/net/res_comp.c
@@ -1,37 +1,49 @@
 /*
  * Copyright (c) 1985 Regents of the University of California.
 /*
  * Copyright (c) 1985 Regents of the University of California.

- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

  */
 
  */
 

-#ifndef lint
-static char sccsid[] = "@(#)res_comp.c 5.1 (Berkeley) %G%";
-#endif not lint
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)res_comp.c 6.16 (Berkeley) %G%";
+#endif /* LIBC_SCCS and not lint */

 
 #include <sys/types.h>
 #include <stdio.h>
 
 #include <sys/types.h>
 #include <stdio.h>

-#include <ctype.h>
-#include <nameser.h>
+#include <arpa/nameser.h>
+
+static dn_find();

 
 /*
  * Expand compressed domain name 'comp_dn' to full domain name.
 
 /*
  * Expand compressed domain name 'comp_dn' to full domain name.

- * Expanded names are converted to upper case.

  * 'msg' is a pointer to the begining of the message,
  * 'msg' is a pointer to the begining of the message,

+ * 'eomorig' points to the first location after the message,

  * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
  * Return size of compressed name or -1 if there was an error.
  */
  * 'exp_dn' is a pointer to a buffer of size 'length' for the result.
  * Return size of compressed name or -1 if there was an error.
  */

-dn_expand(msg, comp_dn, exp_dn, length)
-       char *msg, *comp_dn, *exp_dn;
+dn_expand(msg, eomorig, comp_dn, exp_dn, length)
+       u_char *msg, *eomorig, *comp_dn, *exp_dn;

        int length;
 {
        int length;
 {

-       register char *cp, *dn;
+       register u_char *cp, *dn;

        register int n, c;
        register int n, c;

-       char *eom;
-       int len = -1;
+       u_char *eom;
+       int len = -1, checked = 0;

 
        dn = exp_dn;
        cp = comp_dn;
 
        dn = exp_dn;
        cp = comp_dn;

-       eom = exp_dn + length - 1;
+       eom = exp_dn + length;

        /*
         * fetch next label in domain name
         */
        /*
         * fetch next label in domain name
         */


@@ -48,23 +60,33 @@ dn_expand(msg, comp_dn, exp_dn, length)
                        }
                        if (dn+n >= eom)
                                return (-1);
                        }
                        if (dn+n >= eom)
                                return (-1);

-                       while (--n >= 0)
-                               if (islower(c = *cp++))
-                                       *dn++ = toupper(c);
-                               else {
-                                       if (c == '.') {
-                                               if (dn+n+1 >= eom)
-                                                       return (-1);
-                                               *dn++ = '\\';
-                                       }
-                                       *dn++ = c;
+                       checked += n + 1;
+                       while (--n >= 0) {
+                               if ((c = *cp++) == '.') {
+                                       if (dn+n+1 >= eom)
+                                               return (-1);
+                                       *dn++ = '\\';

                                }
                                }

+                               *dn++ = c;
+                               if (cp >= eomorig)      /* out of range */
+                                       return(-1);
+                       }

                        break;
 
                case INDIR_MASK:
                        if (len < 0)
                                len = cp - comp_dn + 1;
                        cp = msg + (((n & 0x3f) << 8) | (*cp & 0xff));
                        break;
 
                case INDIR_MASK:
                        if (len < 0)
                                len = cp - comp_dn + 1;
                        cp = msg + (((n & 0x3f) << 8) | (*cp & 0xff));

+                       if (cp < msg || cp >= eomorig)  /* out of range */
+                               return(-1);
+                       checked += 2;
+                       /*
+                        * Check for loops in the compressed name;
+                        * if we've looked at the whole message,
+                        * there must be a loop.
+                        */
+                       if (checked >= eomorig - msg)
+                               return (-1);

                        break;
 
                default:
                        break;
 
                default:


@@ -90,18 +112,18 @@ dn_expand(msg, comp_dn, exp_dn, length)
  * is NULL, we don't update the list.
  */
 dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
  * is NULL, we don't update the list.
  */
 dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)

-       char *exp_dn, *comp_dn;
+       u_char *exp_dn, *comp_dn;

        int length;
        int length;

-       char **dnptrs, **lastdnptr;
+       u_char **dnptrs, **lastdnptr;

 {
 {

-       register char *cp, *dn;
+       register u_char *cp, *dn;

        register int c, l;
        register int c, l;

-       char **cpp, **lpp, *sp, *eob;
-       char *msg;
+       u_char **cpp, **lpp, *sp, *eob;
+       u_char *msg;

 
        dn = exp_dn;
        cp = comp_dn;
 
        dn = exp_dn;
        cp = comp_dn;

-       eob = comp_dn + length;
+       eob = cp + length;

        if (dnptrs != NULL) {
                if ((msg = *dnptrs++) != NULL) {
                        for (cpp = dnptrs; *cpp != NULL; cpp++)
        if (dnptrs != NULL) {
                if ((msg = *dnptrs++) != NULL) {
                        for (cpp = dnptrs; *cpp != NULL; cpp++)


@@ -117,7 +139,7 @@ dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
                                if (cp+1 >= eob)
                                        return (-1);
                                *cp++ = (l >> 8) | INDIR_MASK;
                                if (cp+1 >= eob)
                                        return (-1);
                                *cp++ = (l >> 8) | INDIR_MASK;

-                               *cp++ = l;
+                               *cp++ = l % 256;

                                return (cp - comp_dn);
                        }
                        /* not found, save it */
                                return (cp - comp_dn);
                        }
                        /* not found, save it */


@@ -136,8 +158,11 @@ dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
                                if ((c = *dn++) == '\0')
                                        break;
                        }
                                if ((c = *dn++) == '\0')
                                        break;
                        }

-                       if (cp >= eob)
+                       if (cp >= eob) {
+                               if (msg != NULL)
+                                       *lpp = NULL;

                                return (-1);
                                return (-1);

+                       }

                        *cp++ = c;
                } while ((c = *dn++) != '\0');
                /* catch trailing '.'s but not '..' */
                        *cp++ = c;
                } while ((c = *dn++) != '\0');
                /* catch trailing '.'s but not '..' */


@@ -145,12 +170,18 @@ dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
                        cp--;
                        break;
                }
                        cp--;
                        break;
                }

-               if (l <= 0 || l > MAXLABEL)
+               if (l <= 0 || l > MAXLABEL) {
+                       if (msg != NULL)
+                               *lpp = NULL;

                        return (-1);
                        return (-1);

+               }

                *sp = l;
        }
                *sp = l;
        }

-       if (cp >= eob)
+       if (cp >= eob) {
+               if (msg != NULL)
+                       *lpp = NULL;

                return (-1);
                return (-1);

+       }

        *cp++ = '\0';
        return (cp - comp_dn);
 }
        *cp++ = '\0';
        return (cp - comp_dn);
 }


@@ -158,14 +189,14 @@ dn_comp(exp_dn, comp_dn, length, dnptrs, lastdnptr)
 /*
  * Skip over a compressed domain name. Return the size or -1.
  */
 /*
  * Skip over a compressed domain name. Return the size or -1.
  */

-dn_skip(comp_dn)
-       char *comp_dn;
+dn_skipname(comp_dn, eom)
+       u_char *comp_dn, *eom;

 {
 {

-       register char *cp;
+       register u_char *cp;

        register int n;
 
        cp = comp_dn;
        register int n;
 
        cp = comp_dn;

-       while (n = *cp++) {
+       while (cp < eom && (n = *cp++)) {

                /*
                 * check for indirection
                 */
                /*
                 * check for indirection
                 */


@@ -186,14 +217,17 @@ dn_skip(comp_dn)
 /*
  * Search for expanded name from a list of previously compressed names.
  * Return the offset from msg if found or -1.
 /*
  * Search for expanded name from a list of previously compressed names.
  * Return the offset from msg if found or -1.

+ * dnptrs is the pointer to the first name on the list,
+ * not the pointer to the start of the message.

  */
  */

+static

 dn_find(exp_dn, msg, dnptrs, lastdnptr)
 dn_find(exp_dn, msg, dnptrs, lastdnptr)

-       char *exp_dn, *msg;
-       char **dnptrs, **lastdnptr;
+       u_char *exp_dn, *msg;
+       u_char **dnptrs, **lastdnptr;

 {
 {

-       register char *dn, *cp, **cpp;
+       register u_char *dn, *cp, **cpp;

        register int n;
        register int n;

-       char *sp;
+       u_char *sp;

 
        for (cpp = dnptrs; cpp < lastdnptr; cpp++) {
                dn = exp_dn;
 
        for (cpp = dnptrs; cpp < lastdnptr; cpp++) {
                dn = exp_dn;


@@ -205,6 +239,8 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
                        switch (n & INDIR_MASK) {
                        case 0:         /* normal case, n == len */
                                while (--n >= 0) {
                        switch (n & INDIR_MASK) {
                        case 0:         /* normal case, n == len */
                                while (--n >= 0) {

+                                       if (*dn == '.')
+                                               goto next;

                                        if (*dn == '\\')
                                                dn++;
                                        if (*dn++ != *cp++)
                                        if (*dn == '\\')
                                                dn++;
                                        if (*dn++ != *cp++)


@@ -220,7 +256,7 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
                                return (-1);
 
                        case INDIR_MASK:        /* indirection */
                                return (-1);
 
                        case INDIR_MASK:        /* indirection */

-                               cp = msg + (((n & 0x3f) << 8) | (*cp & 0xff));
+                               cp = msg + (((n & 0x3f) << 8) | *cp);

                        }
                }
                if (*dn == '\0')
                        }
                }
                if (*dn == '\0')


@@ -234,40 +270,54 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr)
  * Routines to insert/extract short/long's. Must account for byte
  * order and non-alignment problems. This code at least has the
  * advantage of being portable.
  * Routines to insert/extract short/long's. Must account for byte
  * order and non-alignment problems. This code at least has the
  * advantage of being portable.

+ *
+ * used by sendmail.

  */
 
 u_short
  */
 
 u_short

-getshort(msgp)
-       char *msgp;
+_getshort(msgp)
+       u_char *msgp;

 {
        register u_char *p = (u_char *) msgp;
 {
        register u_char *p = (u_char *) msgp;

+#ifdef vax
+       /*
+        * vax compiler doesn't put shorts in registers
+        */
+       register u_long u;
+#else
+       register u_short u;
+#endif

 
 

-       return ((*p++ << 8) | *p);
+       u = *p++ << 8;
+       return ((u_short)(u | *p));

 }
 
 u_long
 }
 
 u_long

-getlong(msgp)
-       char *msgp;
+_getlong(msgp)
+       u_char *msgp;

 {
        register u_char *p = (u_char *) msgp;
 {
        register u_char *p = (u_char *) msgp;

+       register u_long u;

 
 

-       return ((((((*p++ << 8) | *p++) << 8) | *p++) << 8) | *p);
+       u = *p++; u <<= 8;
+       u |= *p++; u <<= 8;
+       u |= *p++; u <<= 8;
+       return (u | *p);

 }
 
 }
 

-u_short
+

 putshort(s, msgp)
        register u_short s;
 putshort(s, msgp)
        register u_short s;

-       register char *msgp;
+       register u_char *msgp;

 {
 
        msgp[1] = s;
        msgp[0] = s >> 8;
 }
 
 {
 
        msgp[1] = s;
        msgp[0] = s >> 8;
 }
 

-u_long

 putlong(l, msgp)
        register u_long l;
 putlong(l, msgp)
        register u_long l;

-       register char *msgp;
+       register u_char *msgp;

 {
 
        msgp[3] = l;
 {
 
        msgp[3] = l;