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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_strrecord.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_strrecord.c')
-rw-r--r--src/dns/dns_strrecord.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/src/dns/dns_strrecord.c b/src/dns/dns_strrecord.c
new file mode 100644
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+++ b/src/dns/dns_strrecord.c
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+/*++
+/* NAME
+/* dns_strrecord 3
+/* SUMMARY
+/* name service resource record printable forms
+/* SYNOPSIS
+/* #include <dns.h>
+/*
+/* char *dns_strrecord(buf, record)
+/* VSTRING *buf;
+/* DNS_RR *record;
+/* DESCRIPTION
+/* dns_strrecord() formats a DNS resource record as "name ttl
+/* class type preference value", where the class field is
+/* always "IN", the preference field exists only for MX records,
+/* and all names end in ".". The result value is the payload
+/* of the buffer argument.
+/* 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
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h> /* memcpy */
+
+/* Utility library. */
+
+#include <vstring.h>
+#include <msg.h>
+
+/* DNS library. */
+
+#include <dns.h>
+
+/* dns_strrecord - format resource record as generic string */
+
+char *dns_strrecord(VSTRING *buf, DNS_RR *rr)
+{
+ const char myname[] = "dns_strrecord";
+ MAI_HOSTADDR_STR host;
+ UINT32_TYPE soa_buf[5];
+
+ vstring_sprintf(buf, "%s. %u IN %s ",
+ rr->rname, rr->ttl, dns_strtype(rr->type));
+ switch (rr->type) {
+ case T_A:
+#ifdef T_AAAA
+ case T_AAAA:
+#endif
+ if (dns_rr_to_pa(rr, &host) == 0)
+ msg_fatal("%s: conversion error for resource record type %s: %m",
+ myname, dns_strtype(rr->type));
+ vstring_sprintf_append(buf, "%s", host.buf);
+ break;
+ case T_CNAME:
+ case T_DNAME:
+ case T_MB:
+ case T_MG:
+ case T_MR:
+ case T_NS:
+ case T_PTR:
+ vstring_sprintf_append(buf, "%s.", rr->data);
+ break;
+ case T_TXT:
+ vstring_sprintf_append(buf, "%s", rr->data);
+ break;
+ case T_MX:
+ vstring_sprintf_append(buf, "%u %s.", rr->pref, rr->data);
+ break;
+ case T_TLSA:
+ if (rr->data_len >= 3) {
+ uint8_t *ip = (uint8_t *) rr->data;
+ uint8_t usage = *ip++;
+ uint8_t selector = *ip++;
+ uint8_t mtype = *ip++;
+ unsigned i;
+
+ /* /\.example\. \d+ IN TLSA \d+ \d+ \d+ [\da-f]*$/ IGNORE */
+ vstring_sprintf_append(buf, "%d %d %d ", usage, selector, mtype);
+ for (i = 3; i < rr->data_len; ++i)
+ vstring_sprintf_append(buf, "%02x", *ip++);
+ } else {
+ vstring_sprintf_append(buf, "[truncated record]");
+ }
+
+ /*
+ * We use the SOA record TTL to determine the negative reply TTL. We
+ * save the time fields in the SOA record for debugging, but for now
+ * we don't bother saving the source host and mailbox information, as
+ * that would require changes to the DNS_RR structure. See also code
+ * in dns_get_rr().
+ */
+ case T_SOA:
+ memcpy(soa_buf, rr->data, sizeof(soa_buf));
+ vstring_sprintf_append(buf, "- - %u %u %u %u %u",
+ soa_buf[0], soa_buf[1], soa_buf[2],
+ soa_buf[3], soa_buf[4]);
+ break;
+ default:
+ msg_fatal("%s: don't know how to print type %s",
+ myname, dns_strtype(rr->type));
+ }
+ return (vstring_str(buf));
+}