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-rw-r--r--mdk-stage1/dns.c138
-rw-r--r--mdk-stage1/dns.h6
2 files changed, 19 insertions, 125 deletions
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;
}
diff --git a/mdk-stage1/dns.h b/mdk-stage1/dns.h
index 97af9c08a..8506db923 100644
--- a/mdk-stage1/dns.h
+++ b/mdk-stage1/dns.h
@@ -22,9 +22,9 @@
#ifndef H_DNS
#define H_DNS
-#include <netinet/in.h>
+#include <netdb.h>
-int mygethostbyname(char * name, struct in_addr * addr);
-char * mygethostbyaddr(char * ipnum);
+// needs a wrapper since gethostbyname from dietlibc doesn't support domain handling
+struct hostent *mygethostbyname(const char *name);
#endif