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-rw-r--r--src/dns/dns_rr_to_pa.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/src/dns/dns_rr_to_pa.c b/src/dns/dns_rr_to_pa.c
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+++ b/src/dns/dns_rr_to_pa.c
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+/*++
+/* NAME
+/* dns_rr_to_pa 3
+/* SUMMARY
+/* resource record to printable address
+/* SYNOPSIS
+/* #include <dns.h>
+/*
+/* const char *dns_rr_to_pa(rr, hostaddr)
+/* DNS_RR *rr;
+/* MAI_HOSTADDR_STR *hostaddr;
+/* DESCRIPTION
+/* dns_rr_to_pa() converts the address in a DNS resource record
+/* into printable form and returns a pointer to the result.
+/*
+/* Arguments:
+/* .IP rr
+/* The DNS resource record.
+/* .IP hostaddr
+/* Storage for the printable address.
+/* DIAGNOSTICS
+/* The result is null in case of problems, with errno set
+/* to indicate the nature of the problem.
+/* 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 <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+
+/* DNS library. */
+
+#include <dns.h>
+
+/* dns_rr_to_pa - resource record to printable address */
+
+const char *dns_rr_to_pa(DNS_RR *rr, MAI_HOSTADDR_STR *hostaddr)
+{
+ if (rr->type == T_A) {
+ return (inet_ntop(AF_INET, rr->data, hostaddr->buf,
+ sizeof(hostaddr->buf)));
+#ifdef HAS_IPV6
+ } else if (rr->type == T_AAAA) {
+ return (inet_ntop(AF_INET6, rr->data, hostaddr->buf,
+ sizeof(hostaddr->buf)));
+#endif
+ } else {
+ errno = EAFNOSUPPORT;
+ return (0);
+ }
+}
+
+ /*
+ * Stand-alone test program.
+ */
+#ifdef TEST
+#include <vstream.h>
+#include <myaddrinfo.h>
+
+static const char *myname;
+
+static NORETURN usage(void)
+{
+ msg_fatal("usage: %s dnsaddrtype hostname", myname);
+}
+
+int main(int argc, char **argv)
+{
+ DNS_RR *rr;
+ MAI_HOSTADDR_STR hostaddr;
+ VSTRING *why;
+ int type;
+
+ myname = argv[0];
+ if (argc < 3)
+ usage();
+ why = vstring_alloc(1);
+
+ while (*++argv) {
+ if (argv[1] == 0)
+ usage();
+ if ((type = dns_type(argv[0])) == 0)
+ usage();
+ if (dns_lookup(argv[1], type, 0, &rr, (VSTRING *) 0, why) != DNS_OK)
+ msg_fatal("%s: %s", argv[1], vstring_str(why));
+ if (dns_rr_to_pa(rr, &hostaddr) == 0)
+ msg_fatal("dns_rr_to_sa: %m");
+ vstream_printf("%s -> %s\n", argv[1], hostaddr.buf);
+ vstream_fflush(VSTREAM_OUT);
+ argv += 1;
+ dns_rr_free(rr);
+ }
+ vstring_free(why);
+ return (0);
+}
+
+#endif