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

diff --git a/usr/src/lib/libc/net/gethostnamadr.c b/usr/src/lib/libc/net/gethostnamadr.c
index fe8663a..a945985 100644 (file)
--- a/usr/src/lib/libc/net/gethostnamadr.c
+++ b/usr/src/lib/libc/net/gethostnamadr.c
@@ -1,24 +1,32 @@
 /*
 /*

- * Copyright (c) 1985 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1985, 1988 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of California at 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'' without express or implied warranty.

  */
 
  */
 

-#ifndef lint
-static char sccsid[] = "@(#)gethostnamadr.c    6.2 (Berkeley) %G%";
-#endif not lint
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)gethostnamadr.c    6.32 (Berkeley) %G%";
+#endif /* LIBC_SCCS and not lint */

 
 

-#include <sys/types.h>

 #include <sys/param.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <sys/param.h>
 #include <sys/socket.h>
 #include <netinet/in.h>

+#include <ctype.h>

 #include <netdb.h>
 #include <stdio.h>
 #include <netdb.h>
 #include <stdio.h>

+#include <errno.h>
+#include <arpa/inet.h>

 #include <arpa/nameser.h>
 #include <arpa/nameser.h>

-#include <arpa/resolv.h>
+#include <resolv.h>

 
 #define        MAXALIASES      35
 
 #define        MAXALIASES      35

-#define MAXADDRS       35
+#define        MAXADDRS        35

 
 static char *h_addr_ptrs[MAXADDRS + 1];
 
 
 static char *h_addr_ptrs[MAXADDRS + 1];
 


@@ -26,10 +34,22 @@ static struct hostent host;
 static char *host_aliases[MAXALIASES];
 static char hostbuf[BUFSIZ+1];
 static struct in_addr host_addr;
 static char *host_aliases[MAXALIASES];
 static char hostbuf[BUFSIZ+1];
 static struct in_addr host_addr;

+static char HOSTDB[] = "/etc/hosts";
+static FILE *hostf = NULL;
+static char hostaddr[MAXADDRS];
+static char *host_addrs[2];
+static int stayopen = 0;
+static char *any();
+
+#if PACKETSZ > 1024
+#define        MAXPACKET       PACKETSZ
+#else
+#define        MAXPACKET       1024
+#endif

 
 typedef union {
 
 typedef union {

-    HEADER qb1;
-    char qb2[PACKETSZ];
+    HEADER hdr;
+    u_char buf[MAXPACKET];

 } querybuf;
 
 static union {
 } querybuf;
 
 static union {


@@ -38,76 +58,73 @@ static union {
 } align;
 
 
 } align;
 
 

+int h_errno;
+extern errno;
+

 static struct hostent *
 static struct hostent *

-getanswer(msg, msglen, iquery)
-       char *msg;
-       int msglen, iquery;
+getanswer(answer, anslen, iquery)
+       querybuf *answer;
+       int anslen;
+       int iquery;

 {
        register HEADER *hp;
 {
        register HEADER *hp;

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

        register int n;
        register int n;

-       querybuf answer;
-       char *eom, *bp, **ap;
-       int type, class, ancount, qdcount, buflen;
-       int haveanswer, getclass;
+       u_char *eom;
+       char *bp, **ap;
+       int type, class, buflen, ancount, qdcount;
+       int haveanswer, getclass = C_ANY;

        char **hap;
 
        char **hap;
 

-       n = res_send(msg, msglen, (char *)&answer, sizeof(answer));
-       if (n < 0) {
-#ifdef DEBUG
-               if (_res.options & RES_DEBUG)
-                       printf("res_send failed\n");
-#endif
-               return (NULL);
-       }
-       eom = (char *)&answer + n;
+       eom = answer->buf + anslen;

        /*
         * find first satisfactory answer
         */
        /*
         * find first satisfactory answer
         */

-       hp = (HEADER *) &answer;
+       hp = &answer->hdr;

        ancount = ntohs(hp->ancount);
        qdcount = ntohs(hp->qdcount);
        ancount = ntohs(hp->ancount);
        qdcount = ntohs(hp->qdcount);

-       if (hp->rcode != NOERROR || ancount == 0) {
-#ifdef DEBUG
-               if (_res.options & RES_DEBUG)
-                       printf("rcode = %d, ancount=%d\n", hp->rcode, ancount);
-#endif
-               return (NULL);
-       }

        bp = hostbuf;
        buflen = sizeof(hostbuf);
        bp = hostbuf;
        buflen = sizeof(hostbuf);

-       cp = (char *)&answer + sizeof(HEADER);
+       cp = answer->buf + sizeof(HEADER);

        if (qdcount) {
                if (iquery) {
        if (qdcount) {
                if (iquery) {

-                       if ((n = dn_expand((char *)&answer, cp, bp, buflen)) <0)
-                               return (NULL);
+                       if ((n = dn_expand((char *)answer->buf, eom,
+                            cp, bp, buflen)) < 0) {
+                               h_errno = NO_RECOVERY;
+                               return ((struct hostent *) NULL);
+                       }

                        cp += n + QFIXEDSZ;
                        host.h_name = bp;
                        n = strlen(bp) + 1;
                        bp += n;
                        buflen -= n;
                } else
                        cp += n + QFIXEDSZ;
                        host.h_name = bp;
                        n = strlen(bp) + 1;
                        bp += n;
                        buflen -= n;
                } else

-                       cp += dn_skip(cp) + QFIXEDSZ;
+                       cp += dn_skipname(cp, eom) + QFIXEDSZ;

                while (--qdcount > 0)
                while (--qdcount > 0)

-                       cp += dn_skip(cp) + QFIXEDSZ;
-       } else if (iquery)
-               return (NULL);
+                       cp += dn_skipname(cp, eom) + QFIXEDSZ;
+       } else if (iquery) {
+               if (hp->aa)
+                       h_errno = HOST_NOT_FOUND;
+               else
+                       h_errno = TRY_AGAIN;
+               return ((struct hostent *) NULL);
+       }

        ap = host_aliases;
        host.h_aliases = host_aliases;
        hap = h_addr_ptrs;
        ap = host_aliases;
        host.h_aliases = host_aliases;
        hap = h_addr_ptrs;

-#ifdef BSD4_3
+#if BSD >= 43 || defined(h_addr)       /* new-style hostent structure */

        host.h_addr_list = h_addr_ptrs;
 #endif
        haveanswer = 0;
        while (--ancount >= 0 && cp < eom) {
        host.h_addr_list = h_addr_ptrs;
 #endif
        haveanswer = 0;
        while (--ancount >= 0 && cp < eom) {

-               if ((n = dn_expand((char *)&answer, cp, bp, buflen)) < 0)
+               if ((n = dn_expand((char *)answer->buf, eom, cp, bp, buflen)) < 0)

                        break;
                cp += n;
                        break;
                cp += n;

-               type = getshort(cp);
+               type = _getshort(cp);

                cp += sizeof(u_short);
                cp += sizeof(u_short);

-               class = getshort(cp);
+               class = _getshort(cp);

                cp += sizeof(u_short) + sizeof(u_long);
                cp += sizeof(u_short) + sizeof(u_long);

-               n = getshort(cp);
+               n = _getshort(cp);

                cp += sizeof(u_short);
                if (type == T_CNAME) {
                        cp += n;
                cp += sizeof(u_short);
                if (type == T_CNAME) {
                        cp += n;


@@ -119,22 +136,17 @@ getanswer(msg, msglen, iquery)
                        buflen -= n;
                        continue;
                }
                        buflen -= n;
                        continue;
                }

-               if (type == T_PTR) {
-                       if ((n = dn_expand((char *)&answer, cp, bp, buflen)) < 
-0) {
+               if (iquery && type == T_PTR) {
+                       if ((n = dn_expand((char *)answer->buf, eom,
+                           cp, bp, buflen)) < 0) {

                                cp += n;
                                continue;
                        }
                        cp += n;
                        host.h_name = bp;
                                cp += n;
                                continue;
                        }
                        cp += n;
                        host.h_name = bp;

-#ifdef BSD4_3

                        return(&host);
                        return(&host);

-#else
-                       haveanswer++;
-                       break;
-#endif

                }
                }

-               if (type != T_A)  {
+               if (iquery || type != T_A)  {

 #ifdef DEBUG
                        if (_res.options & RES_DEBUG)
                                printf("unexpected answer type %d, size %d\n",
 #ifdef DEBUG
                        if (_res.options & RES_DEBUG)
                                printf("unexpected answer type %d, size %d\n",


@@ -162,7 +174,7 @@ getanswer(msg, msglen, iquery)
                        }
                }
 
                        }
                }
 

-               bp += ((u_long)bp % sizeof(align));
+               bp += sizeof(align) - ((u_long)bp % sizeof(align));

 
                if (bp + n >= &hostbuf[sizeof(hostbuf)]) {
 #ifdef DEBUG
 
                if (bp + n >= &hostbuf[sizeof(hostbuf)]) {
 #ifdef DEBUG


@@ -178,32 +190,55 @@ getanswer(msg, msglen, iquery)
        }
        if (haveanswer) {
                *ap = NULL;
        }
        if (haveanswer) {
                *ap = NULL;

+#if BSD >= 43 || defined(h_addr)       /* new-style hostent structure */

                *hap = NULL;
                *hap = NULL;

-#ifndef BSD4_3
-               host.h_addr = h_addr_ptrs[0]; 
+#else
+               host.h_addr = h_addr_ptrs[0];

 #endif
                return (&host);
 #endif
                return (&host);

-       } else
-               return (NULL);
+       } else {
+               h_errno = TRY_AGAIN;
+               return ((struct hostent *) NULL);
+       }

 }
 
 struct hostent *
 gethostbyname(name)
        char *name;
 {
 }
 
 struct hostent *
 gethostbyname(name)
        char *name;
 {

-       int n;

        querybuf buf;
        querybuf buf;

+       register char *cp;
+       int n;
+       struct hostent *hp, *gethostdomain();
+       extern struct hostent *_gethtbyname();

 
 

-       n = res_mkquery(QUERY, name, C_ANY, T_A, (char *)NULL, 0, NULL,
-               (char *)&buf, sizeof(buf));
-       if (n < 0) {
+       /*
+        * disallow names consisting only of digits/dots, unless
+        * they end in a dot.
+        */
+       if (isdigit(name[0]))
+               for (cp = name;; ++cp) {
+                       if (!*cp) {
+                               if (*--cp == '.')
+                                       break;
+                               h_errno = HOST_NOT_FOUND;
+                               return ((struct hostent *) NULL);
+                       }
+                       if (!isdigit(*cp) && *cp != '.') 
+                               break;
+               }
+
+       if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) {

 #ifdef DEBUG
                if (_res.options & RES_DEBUG)
 #ifdef DEBUG
                if (_res.options & RES_DEBUG)

-                       printf("res_mkquery failed\n");
+                       printf("res_search failed\n");

 #endif
 #endif

-               return (NULL);
+               if (errno == ECONNREFUSED)
+                       return (_gethtbyname(name));
+               else
+                       return ((struct hostent *) NULL);

        }
        }

-       return(getanswer((char *)&buf, n, 0));
+       return (getanswer(&buf, n, 0));

 }
 
 struct hostent *
 }
 
 struct hostent *


@@ -215,25 +250,28 @@ gethostbyaddr(addr, len, type)
        querybuf buf;
        register struct hostent *hp;
        char qbuf[MAXDNAME];
        querybuf buf;
        register struct hostent *hp;
        char qbuf[MAXDNAME];

-
+       extern struct hostent *_gethtbyaddr();
+       

        if (type != AF_INET)
        if (type != AF_INET)

-               return (NULL);
+               return ((struct hostent *) NULL);

        (void)sprintf(qbuf, "%d.%d.%d.%d.in-addr.arpa",
        (void)sprintf(qbuf, "%d.%d.%d.%d.in-addr.arpa",

-               (*(unsigned *)addr >> 24 & 0xff),
-               (*(unsigned *)addr >> 16 & 0xff),
-               (*(unsigned *)addr >> 8 & 0xff),
-               (*(unsigned *)addr & 0xff));
-       n = res_mkquery(QUERY, qbuf, C_IN, T_PTR, NULL, 0, NULL,
-               (char *)&buf, sizeof(buf));
+               ((unsigned)addr[3] & 0xff),
+               ((unsigned)addr[2] & 0xff),
+               ((unsigned)addr[1] & 0xff),
+               ((unsigned)addr[0] & 0xff));
+       n = res_query(qbuf, C_IN, T_PTR, (char *)&buf, sizeof(buf));

        if (n < 0) {
 #ifdef DEBUG
                if (_res.options & RES_DEBUG)
        if (n < 0) {
 #ifdef DEBUG
                if (_res.options & RES_DEBUG)

-                       printf("res_mkquery failed\n");
+                       printf("res_query failed\n");

 #endif
 #endif

-               return (NULL);
+               if (errno == ECONNREFUSED)
+                       return (_gethtbyaddr(addr, len, type));
+               return ((struct hostent *) NULL);

        }
        }

-       if ((hp = getanswer((char *)&buf, n, 1)) == NULL)
-               return(NULL);
+       hp = getanswer(&buf, n, 1);
+       if (hp == NULL)
+               return ((struct hostent *) NULL);

        hp->h_addrtype = type;
        hp->h_length = len;
        h_addr_ptrs[0] = (char *)&host_addr;
        hp->h_addrtype = type;
        hp->h_length = len;
        h_addr_ptrs[0] = (char *)&host_addr;


@@ -242,3 +280,122 @@ gethostbyaddr(addr, len, type)
        return(hp);
 }
 
        return(hp);
 }
 

+_sethtent(f)
+       int f;
+{
+       if (hostf == NULL)
+               hostf = fopen(HOSTDB, "r" );
+       else
+               rewind(hostf);
+       stayopen |= f;
+}
+
+_endhtent()
+{
+       if (hostf && !stayopen) {
+               (void) fclose(hostf);
+               hostf = NULL;
+       }
+}
+
+struct hostent *
+_gethtent()
+{
+       char *p;
+       register char *cp, **q;
+
+       if (hostf == NULL && (hostf = fopen(HOSTDB, "r" )) == NULL)
+               return (NULL);
+again:
+       if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL)
+               return (NULL);
+       if (*p == '#')
+               goto again;
+       cp = any(p, "#\n");
+       if (cp == NULL)
+               goto again;
+       *cp = '\0';
+       cp = any(p, " \t");
+       if (cp == NULL)
+               goto again;
+       *cp++ = '\0';
+       /* THIS STUFF IS INTERNET SPECIFIC */
+#if BSD >= 43 || defined(h_addr)       /* new-style hostent structure */
+       host.h_addr_list = host_addrs;
+#endif
+       host.h_addr = hostaddr;
+       *((u_long *)host.h_addr) = inet_addr(p);
+       host.h_length = sizeof (u_long);
+       host.h_addrtype = AF_INET;
+       while (*cp == ' ' || *cp == '\t')
+               cp++;
+       host.h_name = cp;
+       q = host.h_aliases = host_aliases;
+       cp = any(cp, " \t");
+       if (cp != NULL) 
+               *cp++ = '\0';
+       while (cp && *cp) {
+               if (*cp == ' ' || *cp == '\t') {
+                       cp++;
+                       continue;
+               }
+               if (q < &host_aliases[MAXALIASES - 1])
+                       *q++ = cp;
+               cp = any(cp, " \t");
+               if (cp != NULL)
+                       *cp++ = '\0';
+       }
+       *q = NULL;
+       return (&host);
+}
+
+static char *
+any(cp, match)
+       register char *cp;
+       char *match;
+{
+       register char *mp, c;
+
+       while (c = *cp) {
+               for (mp = match; *mp; mp++)
+                       if (*mp == c)
+                               return (cp);
+               cp++;
+       }
+       return ((char *)0);
+}
+
+struct hostent *
+_gethtbyname(name)
+       char *name;
+{
+       register struct hostent *p;
+       register char **cp;
+       
+       _sethtent(0);
+       while (p = _gethtent()) {
+               if (strcasecmp(p->h_name, name) == 0)
+                       break;
+               for (cp = p->h_aliases; *cp != 0; cp++)
+                       if (strcasecmp(*cp, name) == 0)
+                               goto found;
+       }
+found:
+       _endhtent();
+       return (p);
+}
+
+struct hostent *
+_gethtbyaddr(addr, len, type)
+       char *addr;
+       int len, type;
+{
+       register struct hostent *p;
+
+       _sethtent(0);
+       while (p = _gethtent())
+               if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len))
+                       break;
+       _endhtent();
+       return (p);
+}