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-rw-r--r--src/dns/dns_rr_eq_sa.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/src/dns/dns_rr_eq_sa.c b/src/dns/dns_rr_eq_sa.c
new file mode 100644
index 0000000..8113d6b
--- /dev/null
+++ b/src/dns/dns_rr_eq_sa.c
@@ -0,0 +1,157 @@
+/*++
+/* NAME
+/* dns_rr_eq_sa 3
+/* SUMMARY
+/* compare resource record with socket address
+/* SYNOPSIS
+/* #include <dns.h>
+/*
+/* int dns_rr_eq_sa(DNS_RR *rr, struct sockaddr *sa)
+/* DNS_RR *rr;
+/* struct sockaddr *sa;
+/*
+/* int DNS_RR_EQ_SA(DNS_RR *rr, struct sockaddr *sa)
+/* DNS_RR *rr;
+/* struct sockaddr *sa;
+/* DESCRIPTION
+/* dns_rr_eq_sa() compares a DNS resource record with a socket
+/* address. The result is non-zero when the resource type
+/* matches the socket address family, and when the network
+/* address information is identical.
+/*
+/* DNS_RR_EQ_SA() is an unsafe macro version for those who live fast.
+/*
+/* Arguments:
+/* .IP rr
+/* DNS resource record pointer.
+/* .IP sa
+/* Binary address pointer.
+/* DIAGNOSTICS
+/* Panic: unknown socket address family.
+/* 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>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <sock_addr.h>
+
+/* DNS library. */
+
+#include <dns.h>
+
+/* dns_rr_eq_sa - compare resource record with socket address */
+
+int dns_rr_eq_sa(DNS_RR *rr, struct sockaddr *sa)
+{
+ const char *myname = "dns_rr_eq_sa";
+
+ if (sa->sa_family == AF_INET) {
+ return (rr->type == T_A
+ && SOCK_ADDR_IN_ADDR(sa).s_addr == IN_ADDR(rr->data).s_addr);
+#ifdef HAS_IPV6
+ } else if (sa->sa_family == AF_INET6) {
+ return (rr->type == T_AAAA
+ && memcmp((void *) &SOCK_ADDR_IN6_ADDR(sa),
+ rr->data, rr->data_len) == 0);
+#endif
+ } else {
+ msg_panic("%s: unsupported socket address family type: %d",
+ myname, sa->sa_family);
+ }
+}
+
+ /*
+ * 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 address", 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;
+ DNS_RR *rr;
+ struct addrinfo *res0;
+ struct addrinfo *res1;
+ struct addrinfo *res;
+ struct addrinfo **resv;
+ size_t len, n;
+ int aierr;
+
+ myname = argv[0];
+
+ if (argc < 3)
+ usage();
+
+ inet_proto_init(argv[0], INET_PROTO_NAME_ALL);
+
+ while (*++argv) {
+ if (argv[1] == 0)
+ usage();
+
+ if ((aierr = hostaddr_to_sockaddr(argv[1], (char *) 0, 0, &res1)) != 0)
+ msg_fatal("host address %s: %s", argv[1], MAI_STRERROR(aierr));
+ if ((rr = dns_sa_to_rr(argv[1], 0, res1->ai_addr)) == 0)
+ msg_fatal("dns_sa_to_rr: %m");
+ freeaddrinfo(res1);
+
+ if ((aierr = hostname_to_sockaddr(argv[0], (char *) 0, 0, &res0)) != 0)
+ msg_fatal("host name %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++) {
+ SOCKADDR_TO_HOSTADDR(resv[n]->ai_addr, resv[n]->ai_addrlen,
+ &hostaddr, (MAI_SERVPORT_STR *) 0, 0);
+ vstream_printf("%s =?= %s\n", hostaddr.buf, argv[1]);
+ vstream_printf("tested by function: %s\n",
+ dns_rr_eq_sa(rr, resv[n]->ai_addr) ?
+ "yes" : "no");
+ vstream_printf("tested by macro: %s\n",
+ DNS_RR_EQ_SA(rr, resv[n]->ai_addr) ?
+ "yes" : "no");
+ }
+ dns_rr_free(rr);
+ freeaddrinfo(res0);
+ myfree((void *) resv);
+ vstream_fflush(VSTREAM_OUT);
+ argv += 1;
+ }
+ return (0);
+}
+
+#endif