1 files changed, 138 insertions, 0 deletions
diff --git a/src/dns/dns_sa_to_rr.c b/src/dns/dns_sa_to_rr.c
new file mode 100644
index 0000000..6b9efcc
--- /dev/null
+++ b/src/dns/dns_sa_to_rr.c
@@ -0,0 +1,138 @@
+/*++
+/* NAME
+/*	dns_sa_to_rr 3
+/* SUMMARY
+/*	socket address to resource record
+/* SYNOPSIS
+/*	#include <dns.h>
+/*
+/*	DNS_RR	*dns_sa_to_rr(hostname, pref, sa)
+/*	const char *hostname;
+/*	unsigned pref;
+/*	struct sockaddr *sa;
+/* DESCRIPTION
+/*	dns_sa_to_rr() converts a socket address into a DNS resource record.
+/*
+/*	Arguments:
+/* .IP hostname
+/*	The resource record host name. This will be both the qname
+/*	and the rname in the synthetic DNS resource record.
+/* .IP pref
+/*	The resource record MX host preference, if applicable.
+/* .IP sa
+/*	Binary address.
+/* DIAGNOSTICS
+/*	The result is a null pointer in case of problems, with the
+/*	errno variable set to indicate the problem type.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System libraries. */
+
+#include <sys_defs.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+
+/* DNS library. */
+
+#include <dns.h>
+
+/* dns_sa_to_rr - socket address to resource record */
+
+DNS_RR *dns_sa_to_rr(const char *hostname, unsigned pref, struct sockaddr *sa)
+{
+#define DUMMY_TTL	0
+
+    if (sa->sa_family == AF_INET) {
+	return (dns_rr_create(hostname, hostname, T_A, C_IN, DUMMY_TTL, pref,
+			      (char *) &SOCK_ADDR_IN_ADDR(sa),
+			      sizeof(SOCK_ADDR_IN_ADDR(sa))));
+#ifdef HAS_IPV6
+    } else if (sa->sa_family == AF_INET6) {
+	return (dns_rr_create(hostname, hostname, T_AAAA, C_IN, DUMMY_TTL, pref,
+			      (char *) &SOCK_ADDR_IN6_ADDR(sa),
+			      sizeof(SOCK_ADDR_IN6_ADDR(sa))));
+#endif
+    } else {
+	errno = EAFNOSUPPORT;
+	return (0);
+    }
+}
+
+ /*
+  * Stand-alone test program.
+  */
+#ifdef TEST
+#include <stdlib.h>
+#include <vstream.h>
+#include <myaddrinfo.h>
+#include <inet_proto.h>
+#include <mymalloc.h>
+
+static const char *myname;
+
+static NORETURN usage(void)
+{
+    msg_fatal("usage: %s hostname", myname);
+}
+
+static int compare_family(const void *a, const void *b)
+{
+    struct addrinfo *resa = *(struct addrinfo **) a;
+    struct addrinfo *resb = *(struct addrinfo **) b;
+
+    return (resa->ai_family - resb->ai_family);
+}
+
+int     main(int argc, char **argv)
+{
+    MAI_HOSTADDR_STR hostaddr;
+    struct addrinfo *res0;
+    struct addrinfo *res;
+    struct addrinfo **resv;
+    size_t  len, n;
+    DNS_RR *rr;
+    int     aierr;
+
+    myname = argv[0];
+    if (argc < 2)
+	usage();
+
+    inet_proto_init(argv[0], INET_PROTO_NAME_ALL);
+
+    while (*++argv) {
+	if ((aierr = hostname_to_sockaddr(argv[0], (char *) 0, 0, &res0)) != 0)
+	    msg_fatal("%s: %s", argv[0], MAI_STRERROR(aierr));
+	for (len = 0, res = res0; res != 0; res = res->ai_next)
+	    len += 1;
+	resv = (struct addrinfo **) mymalloc(len * sizeof(*resv));
+	for (len = 0, res = res0; res != 0; res = res->ai_next)
+	    resv[len++] = res;
+	qsort((void *) resv, len, sizeof(*resv), compare_family);
+	for (n = 0; n < len; n++) {
+	    if ((rr = dns_sa_to_rr(argv[0], 0, resv[n]->ai_addr)) == 0)
+		msg_fatal("dns_sa_to_rr: %m");
+	    if (dns_rr_to_pa(rr, &hostaddr) == 0)
+		msg_fatal("dns_rr_to_pa: %m");
+	    vstream_printf("%s -> %s\n", argv[0], hostaddr.buf);
+	    vstream_fflush(VSTREAM_OUT);
+	    dns_rr_free(rr);
+	}
+	freeaddrinfo(res0);
+	myfree((void *) resv);
+    }
+    return (0);
+}
+
+#endif