From 278ed5e9c6d9b35a7854b31870dbe114d1cba8b2 Mon Sep 17 00:00:00 2001
From: Guillaume Cottenceau <gc@mandriva.com>
Date: Mon, 14 May 2001 14:38:46 +0000
Subject: now use gethostby* functions provided by dietlibc

---
 mdk-stage1/dns.c | 138 +++++++------------------------------------------------
 1 file changed, 16 insertions(+), 122 deletions(-)

(limited to 'mdk-stage1/dns.c')

diff --git a/mdk-stage1/dns.c b/mdk-stage1/dns.c
index ca750536a..054001c58 100644
--- a/mdk-stage1/dns.c
+++ b/mdk-stage1/dns.c
@@ -19,136 +19,30 @@
  *
  */
 
-#include <alloca.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <resolv.h>
-#include <arpa/nameser.h>
-#include <arpa/inet.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <string.h>
+#include <stdio.h>
 
+#include "network.h"
 #include "log.h"
 
 #include "dns.h"
 
-/* This is dumb, but glibc doesn't like to do hostname lookups w/o libc.so */
 
-union dns_response {
-    HEADER hdr;
-    u_char buf[PACKETSZ];
-} ;
-
-static int do_query(char * query, int queryType, char ** domainName, struct in_addr * ipNum)
+// needs a wrapper since gethostbyname from dietlibc doesn't support domain handling
+struct hostent *mygethostbyname(const char *name)
 {
-	int len, ancount, type;
-	u_char * data, * end;
-	char name[MAXDNAME];
-	union dns_response response;
-	
-#ifdef __sparc__
-	/* from jj: */
-	/* We have to wait till ethernet negotiation is done */
-	_res.retry = 3;
-#else
-	_res.retry = 2;
-#endif
-
-
-	len = res_search(query, C_IN, queryType, (void *) &response, sizeof(response));
-	if (len <= 0)
-		return -1;
-
-	if (ntohs(response.hdr.rcode) != NOERROR)
-		return -1;
-
-	ancount = ntohs(response.hdr.ancount);
-	if (ancount < 1)
-		return -1;
-	
-	data = response.buf + sizeof(HEADER);
-	end = response.buf + len;
-	
-	/* skip the question */
-	data += dn_skipname(data, end) + QFIXEDSZ;
-
-	/* parse the answer(s) */
-	while (--ancount >= 0 && data < end) {
-
-		/* skip the domain name portion of the RR record */
-		data += dn_skipname(data, end);
-
-		/* get RR information */
-		GETSHORT(type, data);
-		data += INT16SZ; /* skipp class */
-		data += INT32SZ; /* skipp TTL */
-		GETSHORT(len,  data);
-
-		if (type == T_PTR) {
-			/* we got a pointer */
-			len = dn_expand(response.buf, end, data, name, sizeof(name));
-			if (len <= 0) return -1;
-			if (queryType == T_PTR && domainName) {
-				/* we wanted a pointer */
-				*domainName = malloc(strlen(name) + 1);
-				strcpy(*domainName, name);
-				return 0;
-			}
-		} else if (type == T_A) {
-			/* we got an address */
-			if (queryType == T_A && ipNum) {
-				/* we wanted an address */
-				memcpy(ipNum, data, sizeof(*ipNum));
-				return 0;
-			}
-		}
-		
-		/* move ahead to next RR */
-		data += len;
-	} 
-	
-	return -1;
-}
-
-char * mygethostbyaddr(char * ipnum) {
-	int rc;
-	char * result;
-	char * strbuf;
-	char * chptr;
-	char * splits[4];
-	int i;
-
-	_res.retry = 1;
-	
-	strbuf = alloca(strlen(ipnum) + 1);
-	strcpy(strbuf, ipnum);
-	
-	ipnum = alloca(strlen(strbuf) + 20);
-	
-	for (i = 0; i < 4; i++) {
-		chptr = strbuf;
-		while (*chptr && *chptr != '.')
-			chptr++;
-		*chptr = '\0';
-		
-		if (chptr - strbuf > 3) return NULL;
-		splits[i] = strbuf;
-		strbuf = chptr + 1;
-	}
-	
-	sprintf(ipnum, "%s.%s.%s.%s.in-addr.arpa", splits[3], splits[2], splits[1], splits[0]);
-	
-	rc = do_query(ipnum, T_PTR, &result, NULL);
-	
-	if (rc) 
+	char fully_qualified[500];
+	struct hostent * h;
+	h = gethostbyname(name);
+	if (h)
+		return h;
+	if (!domain)
 		return NULL;
-	else
-		return result;
-}
-
-int mygethostbyname(char * name, struct in_addr * addr) {
-	int rc = do_query(name, T_A, NULL, addr);
-	if (!rc)
-		log_message("%s is-at %s", name, inet_ntoa(*addr));
-	return rc;
+	sprintf(fully_qualified, "%s.%s", name, domain);
+	h = gethostbyname(fully_qualified);
+	if (!h)
+		log_message("unknown host %s", name);
+	return h;
 }
-- 
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