/*
* mxget.c -- fetch MX records for given DNS name
*
- * Copyright 1996 by Eric S. Raymond
- * All rights reserved.
+ * Copyright (C) 1996, 1997, 1998, 2000, 2002 by Eric S. Raymond
+ * Copyright (C) 2005, 2006, 2007 by Matthias Andree
* For license terms, see the file COPYING in this directory.
*/
#include "config.h"
+#include "fetchmail.h"
+#include <stdio.h>
+#include <string.h>
#ifdef HAVE_RES_SEARCH
+#ifdef HAVE_NET_SOCKET_H
+#include <net/socket.h>
+#endif
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
+
+#ifdef __BEOS__
+#include "beos/beos_nameser.h"
+#endif
+
+#ifdef HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
+#endif
+#ifdef HAVE_RESOLV_H
#include <resolv.h>
+#endif
+
#include "mx.h"
/*
/* minimum possible size of MX record in packet */
#define MIN_MX_SIZE 8 /* corresp to "a.com 0" w/ terminating space */
-struct mxentry *getmxrecords(name)
+struct mxentry *getmxrecords(const char *name)
/* get MX records for given host */
-const char *name;
{
- unsigned char answer[PACKETSZ], *eom, *cp, *bp;
+ char answer[PACKETSZ], *eom, *cp, *bp;
int n, ancount, qdcount, buflen, type, pref, ind;
static struct mxentry pmx[(PACKETSZ - HFIXEDSZ) / MIN_MX_SIZE];
static char MXHostBuf[PACKETSZ - HFIXEDSZ];
HEADER *hp;
- n = res_search(name,C_IN,T_MX,(unsigned char*)&answer, sizeof(answer));
+ pmx->name = (char *)NULL;
+ pmx->pref = -1;
+ n = res_search(name, C_IN,T_MX, (unsigned char *)&answer, sizeof(answer));
if (n == -1)
return((struct mxentry *)NULL);
+ if ((size_t)n > sizeof(answer))
+ n = sizeof(answer);
hp = (HEADER *)&answer;
cp = answer + HFIXEDSZ;
eom = answer + n;
h_errno = 0;
for (qdcount = ntohs(hp->qdcount); qdcount--; cp += n + QFIXEDSZ)
- if ((n = dn_skipname(cp, eom)) < 0)
+ if ((n = dn_skipname((unsigned char *)cp, (unsigned char *)eom)) < 0)
return((struct mxentry *)NULL);
buflen = sizeof(MXHostBuf) - 1;
bp = MXHostBuf;
ancount = ntohs(hp->ancount);
while (--ancount >= 0 && cp < eom)
{
- if ((n = dn_expand(answer, eom, cp, bp, buflen)) < 0)
+ if ((n = dn_expand((unsigned char *)answer, (unsigned char *)eom,
+ (unsigned char *)cp, bp, buflen)) < 0)
break;
cp += n;
GETSHORT(type, cp);
continue;
}
GETSHORT(pref, cp);
- if ((n = dn_expand(answer, eom, cp, bp, buflen)) < 0)
+ if ((n = dn_expand((unsigned char *)answer, (unsigned char *)eom,
+ (unsigned char *)cp, bp, buflen)) < 0)
break;
cp += n;
pmx[ind].pref = pref;
++ind;
- n = strlen(bp);
+ n = strlen((const char *)bp);
bp += n;
*bp++ = '\0';
}
#endif /* HAVE_RES_SEARCH */
-#ifdef TESTMAIN
-main(int argc, char *argv[])
+#ifdef STANDALONE
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
{
- int count, i;
+#ifdef HAVE_RES_SEARCH
struct mxentry *responses;
+#endif
+
+ if (argc != 2 || 0 == strcmp(argv[1], "-h")) {
+ fprintf(stderr, "Usage: %s domain\n", argv[0]);
+ exit(1);
+ }
+#ifdef HAVE_RES_SEARCH
responses = getmxrecords(argv[1]);
- if (responses == (struct mxentry *)NULL)
+ if (responses == (struct mxentry *)NULL) {
puts("No MX records found");
- else
+ } else {
do {
printf("%s %d\n", responses->name, responses->pref);
- } while
- ((++responses)->name);
+ } while ((++responses)->name);
+ }
+#else
+ puts("This program was compiled without HAS_RES_SEARCH and does nothing.");
+#endif
+
+ return 0;
}
#endif /* TESTMAIN */