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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/dns/dns_sa_to_rr.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/dns/dns_sa_to_rr.c')
-rw-r--r--src/dns/dns_sa_to_rr.c138
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