* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2015 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
/* See the file NOTICE for conditions of use and distribution. */
#include "../exim.h"
header files. */
#ifndef T_TXT
-#define T_TXT 16
+# define T_TXT 16
#endif
/* Many systems do not have T_SPF. */
#ifndef T_SPF
-#define T_SPF 99
+# define T_SPF 99
#endif
/* New TLSA record for DANE */
#ifndef T_TLSA
-#define T_TLSA 52
+# define T_TLSA 52
#endif
/* Table of recognized DNS record types and their integer values. */
/* See local README for interface description. */
static void *
-dnsdb_open(uschar *filename, uschar **errmsg)
+dnsdb_open(const uschar * filename, uschar **errmsg)
{
filename = filename; /* Keep picky compilers happy */
errmsg = errmsg; /* Ditto */
causes the whole lookup to defer only if none of the DNS queries succeeds; and
'never', where all defers are as if the lookup failed. The default is 'lax'.
-- 'dnssec_FOO', with 'strict', 'lax' and 'never' (default). The meanings are
+- 'dnssec_FOO', with 'strict', 'lax' (default), and 'never'. The meanings are
require, try and don't-try dnssec respectively.
- 'retrans_VAL', set the timeout value. VAL is an Exim time specification
separator, as always, is colon. */
static int
-dnsdb_find(void *handle, uschar *filename, const uschar *keystring, int length,
- uschar **result, uschar **errmsg, uint *do_cache)
+dnsdb_find(void * handle, const uschar * filename, const uschar * keystring,
+ int length, uschar ** result, uschar ** errmsg, uint * do_cache,
+ const uschar * opts)
{
int rc;
-int size = 256;
-int ptr = 0;
int sep = 0;
int defer_mode = PASS;
-int dnssec_mode = OK;
+int dnssec_mode = PASS;
int save_retrans = dns_retrans;
int save_retry = dns_retry;
int type;
const uschar *outsep2 = NULL;
uschar *equals, *domain, *found;
-/* Because we're the working in the search pool, we try to reclaim as much
-store as possible later, so we preallocate the result here */
+dns_answer * dnsa = store_get_dns_answer();
+dns_scan dnss;
-uschar *yield = store_get(size);
+/* Because we're working in the search pool, we try to reclaim as much
+store as possible later, so we preallocate the result here */
-dns_record *rr;
-dns_answer dnsa;
-dns_scan dnss;
+gstring * yield = string_get(256);
handle = handle; /* Keep picky compilers happy */
filename = filename;
while (tend > keystring && isspace(tend[-1])) tend--;
len = tend - keystring;
- for (i = 0; i < sizeof(type_names)/sizeof(uschar *); i++)
- {
+ for (i = 0; i < nelem(type_names); i++)
if (len == Ustrlen(type_names[i]) &&
strncmpic(keystring, US type_names[i], len) == 0)
{
type = type_values[i];
break;
}
- }
- if (i >= sizeof(type_names)/sizeof(uschar *))
+ if (i >= nelem(type_names))
{
*errmsg = US"unsupported DNS record type";
return DEFER;
while ((domain = string_nextinlist(&keystring, &sep, NULL, 0)))
{
- uschar rbuffer[256];
- int searchtype = (type == T_CSA)? T_SRV : /* record type we want */
- (type == T_MXH)? T_MX :
- (type == T_ZNS)? T_NS : type;
+ int searchtype = type == T_CSA ? T_SRV : /* record type we want */
+ type == T_MXH ? T_MX :
+ type == T_ZNS ? T_NS : type;
/* If the type is PTR or CSA, we have to construct the relevant magic lookup
key if the original is an IP address (some experimental protocols are using
if ((type == T_PTR || type == T_CSA) &&
string_is_ip_address(domain, NULL) != 0)
- {
- dns_build_reverse(domain, rbuffer);
- domain = rbuffer;
- }
+ domain = dns_build_reverse(domain);
do
{
- DEBUG(D_lookup) debug_printf("dnsdb key: %s\n", domain);
+ DEBUG(D_lookup) debug_printf_indent("dnsdb key: %s\n", domain);
/* Do the lookup and sort out the result. There are four special types that
are handled specially: T_CSA, T_ZNS, T_ADDRESSES and T_MXH.
{
if (searchtype == T_ADDRESSES) searchtype = T_AAAA;
else if (searchtype == T_AAAA) searchtype = T_A;
- rc = dns_special_lookup(&dnsa, domain, searchtype, CUSS &found);
+ rc = dns_special_lookup(dnsa, domain, searchtype, CUSS &found);
}
else
#endif
- rc = dns_special_lookup(&dnsa, domain, type, CUSS &found);
+ rc = dns_special_lookup(dnsa, domain, type, CUSS &found);
lookup_dnssec_authenticated = dnssec_mode==OK ? NULL
- : dns_is_secure(&dnsa) ? US"yes" : US"no";
+ : dns_is_secure(dnsa) ? US"yes" : US"no";
if (rc == DNS_NOMATCH || rc == DNS_NODATA) continue;
if ( rc != DNS_SUCCEED
- || (dnssec_mode == DEFER && !dns_is_secure(&dnsa))
+ || (dnssec_mode == DEFER && !dns_is_secure(dnsa))
)
{
if (defer_mode == DEFER)
/* Search the returned records */
- for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == searchtype)
{
- if (rr->type != searchtype) continue;
-
if (*do_cache > rr->ttl)
*do_cache = rr->ttl;
if (type == T_A || type == T_AAAA || type == T_ADDRESSES)
{
- dns_address *da;
- for (da = dns_address_from_rr(&dnsa, rr); da; da = da->next)
+ for (dns_address * da = dns_address_from_rr(dnsa, rr); da; da = da->next)
{
- if (ptr != 0) yield = string_catn(yield, &size, &ptr, outsep, 1);
- yield = string_cat(yield, &size, &ptr, da->address);
+ if (yield->ptr) yield = string_catn(yield, outsep, 1);
+ yield = string_cat(yield, da->address);
}
continue;
}
/* Other kinds of record just have one piece of data each, but there may be
several of them, of course. */
- if (ptr != 0) yield = string_catn(yield, &size, &ptr, outsep, 1);
+ if (yield->ptr) yield = string_catn(yield, outsep, 1);
if (type == T_TXT || type == T_SPF)
{
- if (outsep2 == NULL)
- {
- /* output only the first item of data */
- yield = string_catn(yield, &size, &ptr, (uschar *)(rr->data+1),
- (rr->data)[0]);
- }
+ if (outsep2 == NULL) /* output only the first item of data */
+ yield = string_catn(yield, US (rr->data+1), (rr->data)[0]);
else
{
/* output all items */
{
uschar chunk_len = (rr->data)[data_offset++];
if (outsep2[0] != '\0' && data_offset != 1)
- yield = string_catn(yield, &size, &ptr, outsep2, 1);
- yield = string_catn(yield, &size, &ptr,
- US ((rr->data)+data_offset), chunk_len);
+ yield = string_catn(yield, outsep2, 1);
+ yield = string_catn(yield, US ((rr->data)+data_offset), chunk_len);
data_offset += chunk_len;
}
}
else if (type == T_TLSA)
{
uint8_t usage, selector, matching_type;
- uint16_t i, payload_length;
+ uint16_t payload_length;
uschar s[MAX_TLSA_EXPANDED_SIZE];
uschar * sp = s;
uschar * p = US rr->data;
sp += sprintf(CS s, "%d%c%d%c%d%c", usage, *outsep2,
selector, *outsep2, matching_type, *outsep2);
/* Now append the cert/identifier, one hex char at a time */
- for (i=0;
- i < payload_length && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4);
- i++)
- sp += sprintf(CS sp, "%02x", (unsigned char)p[i]);
+ while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
+ sp += sprintf(CS sp, "%02x", *p++);
- yield = string_cat(yield, &size, &ptr, s);
+ yield = string_cat(yield, s);
}
else /* T_CNAME, T_CSA, T_MX, T_MXH, T_NS, T_PTR, T_SOA, T_SRV */
{
case T_MX:
GETSHORT(priority, p);
sprintf(CS s, "%d%c", priority, *outsep2);
- yield = string_cat(yield, &size, &ptr, s);
+ yield = string_cat(yield, s);
break;
case T_SRV:
GETSHORT(port, p);
sprintf(CS s, "%d%c%d%c%d%c", priority, *outsep2,
weight, *outsep2, port, *outsep2);
- yield = string_cat(yield, &size, &ptr, s);
+ yield = string_cat(yield, s);
break;
case T_CSA:
}
s[1] = ' ';
- yield = string_catn(yield, &size, &ptr, s, 2);
+ yield = string_catn(yield, s, 2);
break;
default:
/* GETSHORT() has advanced the pointer to the target domain. */
- rc = dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p,
+ rc = dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, p,
(DN_EXPAND_ARG4_TYPE)s, sizeof(s));
/* If an overlong response was received, the data will have been
"domain=%s", dns_text_type(type), domain);
break;
}
- else yield = string_cat(yield, &size, &ptr, s);
+ else yield = string_cat(yield, s);
if (type == T_SOA && outsep2 != NULL)
{
unsigned long serial, refresh, retry, expire, minimum;
p += rc;
- yield = string_catn(yield, &size, &ptr, outsep2, 1);
+ yield = string_catn(yield, outsep2, 1);
- rc = dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p,
+ rc = dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, p,
(DN_EXPAND_ARG4_TYPE)s, sizeof(s));
if (rc < 0)
{
"domain=%s", dns_text_type(type), domain);
break;
}
- else yield = string_cat(yield, &size, &ptr, s);
+ else yield = string_cat(yield, s);
p += rc;
GETLONG(serial, p); GETLONG(refresh, p);
sprintf(CS s, "%c%lu%c%lu%c%lu%c%lu%c%lu",
*outsep2, serial, *outsep2, refresh,
*outsep2, retry, *outsep2, expire, *outsep2, minimum);
- yield = string_cat(yield, &size, &ptr, s);
+ yield = string_cat(yield, s);
}
}
} /* Loop for list of returned records */
- /* Loop for set of A-lookupu types */
+ /* Loop for set of A-lookup types */
} while (type == T_ADDRESSES && searchtype != T_A);
} /* Loop for list of domains */
/* Reclaim unused memory */
-store_reset(yield + ptr + 1);
+gstring_release_unused(yield);
-/* If ptr == 0 we have not found anything. Otherwise, insert the terminating
+/* If yield NULL we have not found anything. Otherwise, insert the terminating
zero and return the result. */
dns_retrans = save_retrans;
dns_retry = save_retry;
dns_init(FALSE, FALSE, FALSE); /* clear the dnssec bit for getaddrbyname */
-if (ptr == 0) return failrc;
-yield[ptr] = 0;
-*result = yield;
+if (!yield || !yield->ptr) return failrc;
+
+*result = string_from_gstring(yield);
return OK;
}
static lookup_info _lookup_info = {
- US"dnsdb", /* lookup name */
- lookup_querystyle, /* query style */
- dnsdb_open, /* open function */
- NULL, /* check function */
- dnsdb_find, /* find function */
- NULL, /* no close function */
- NULL, /* no tidy function */
- NULL, /* no quoting function */
- dnsdb_version_report /* version reporting */
+ .name = US"dnsdb", /* lookup name */
+ .type = lookup_querystyle, /* query style */
+ .open = dnsdb_open, /* open function */
+ .check = NULL, /* check function */
+ .find = dnsdb_find, /* find function */
+ .close = NULL, /* no close function */
+ .tidy = NULL, /* no tidy function */
+ .quote = NULL, /* no quoting function */
+ .version_report = dnsdb_version_report /* version reporting */
};
#ifdef DYNLOOKUP
projects / exim.git / blobdiff