* Exim - an Internet mail transport agent *
*************************************************/
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Functions for finding hosts, either by gethostbyname(), gethostbyaddr(), or
directly via the DNS. When IPv6 is supported, getipnodebyname() and
if (limit < 1)
return 0;
if (random_seed == 0)
- {
- if (f.running_in_test_harness) random_seed = 42; else
+ if (f.running_in_test_harness)
+ random_seed = 42;
+ else
{
int p = (int)getpid();
random_seed = (int)time(NULL) ^ ((p << 16) | p);
}
- }
random_seed = 1103515245 * random_seed + 12345;
return (unsigned int)(random_seed >> 16) % limit;
}
time_msec = get_time_in_ms();
retval = dns_lookup(dnsa, name, type, fully_qualified_name);
if ((time_msec = get_time_in_ms() - time_msec) > slow_lookup_log)
- log_long_lookup(US"name", name, time_msec);
+ log_long_lookup(dns_text_type(type), name, time_msec);
return retval;
}
uschar *adds;
uschar **alist;
struct hostent *yield;
-dns_answer dnsa;
+dns_answer * dnsa = store_get_dns_answer();
dns_scan dnss;
DEBUG(D_host_lookup)
debug_printf("using host_fake_gethostbyname for %s (%s)\n", name,
- (af == AF_INET)? "IPv4" : "IPv6");
+ af == AF_INET ? "IPv4" : "IPv6");
/* Handle unqualified "localhost" */
if (Ustrcmp(name, "localhost") == 0)
- lname = (af == AF_INET)? US"127.0.0.1" : US"::1";
+ lname = af == AF_INET ? US"127.0.0.1" : US"::1";
/* Handle a literal IP address */
if ((ipa = string_is_ip_address(lname, NULL)) != 0)
- {
- if ((ipa == 4 && af == AF_INET) ||
- (ipa == 6 && af == AF_INET6))
+ if ( ipa == 4 && af == AF_INET
+ || ipa == 6 && af == AF_INET6)
{
int x[4];
- yield = store_get(sizeof(struct hostent), FALSE);
- alist = store_get(2 * sizeof(char *), FALSE);
- adds = store_get(alen, FALSE);
+ yield = store_get(sizeof(struct hostent), GET_UNTAINTED);
+ alist = store_get(2 * sizeof(char *), GET_UNTAINTED);
+ adds = store_get(alen, GET_UNTAINTED);
yield->h_name = CS name;
yield->h_aliases = NULL;
yield->h_addrtype = af;
else
{
*error_num = HOST_NOT_FOUND;
- return NULL;
+ yield = NULL;
+ goto out;
}
- }
/* Handle a host name */
else
{
- int type = (af == AF_INET)? T_A:T_AAAA;
- int rc = dns_lookup_timerwrap(&dnsa, lname, type, NULL);
+ int type = af == AF_INET ? T_A:T_AAAA;
+ int rc = dns_lookup_timerwrap(dnsa, lname, type, NULL);
int count = 0;
lookup_dnssec_authenticated = NULL;
switch(rc)
{
case DNS_SUCCEED: break;
- case DNS_NOMATCH: *error_num = HOST_NOT_FOUND; return NULL;
- case DNS_NODATA: *error_num = NO_DATA; return NULL;
- case DNS_AGAIN: *error_num = TRY_AGAIN; return NULL;
+ case DNS_NOMATCH: *error_num = HOST_NOT_FOUND; yield = NULL; goto out;
+ case DNS_NODATA: *error_num = NO_DATA; yield = NULL; goto out;
+ case DNS_AGAIN: *error_num = TRY_AGAIN; yield = NULL; goto out;
default:
- case DNS_FAIL: *error_num = NO_RECOVERY; return NULL;
+ case DNS_FAIL: *error_num = NO_RECOVERY; yield = NULL; goto out;
}
- for (dns_record * rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
rr;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == type)
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == type)
count++;
- yield = store_get(sizeof(struct hostent), FALSE);
- alist = store_get((count + 1) * sizeof(char *), FALSE);
- adds = store_get(count *alen, FALSE);
+ yield = store_get(sizeof(struct hostent), GET_UNTAINTED);
+ alist = store_get((count + 1) * sizeof(char *), GET_UNTAINTED);
+ adds = store_get(count *alen, GET_UNTAINTED);
yield->h_name = CS name;
yield->h_aliases = NULL;
yield->h_length = alen;
yield->h_addr_list = CSS alist;
- for (dns_record * rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
rr;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == type)
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == type)
{
int x[4];
dns_address *da;
- if (!(da = dns_address_from_rr(&dnsa, rr))) break;
+ if (!(da = dns_address_from_rr(dnsa, rr))) break;
*alist++ = adds;
for (int n = host_aton(da->address, x), i = 0; i < n; i++)
{
*alist = NULL;
}
+out:
+
+store_free_dns_answer(dnsa);
return yield;
}
continue;
}
- h = store_get(sizeof(host_item), FALSE);
+ h = store_get(sizeof(host_item), GET_UNTAINTED);
h->name = name;
h->address = NULL;
h->port = PORT_NONE;
h->mx = fake_mx;
- h->sort_key = randomize? (-fake_mx)*1000 + random_number(1000) : 0;
+ h->sort_key = randomize ? (-fake_mx)*1000 + random_number(1000) : 0;
h->status = hstatus_unknown;
h->why = hwhy_unknown;
h->last_try = 0;
}
-
-
-
-/*************************************************
-* Extract port from address string *
-*************************************************/
-
-/* In the spool file, and in the -oMa and -oMi options, a host plus port is
-given as an IP address followed by a dot and a port number. This function
-decodes this.
-
-An alternative format for the -oMa and -oMi options is [ip address]:port which
-is what Exim 4 uses for output, because it seems to becoming commonly used,
-whereas the dot form confuses some programs/people. So we recognize that form
-too.
-
-Argument:
- address points to the string; if there is a port, the '.' in the string
- is overwritten with zero to terminate the address; if the string
- is in the [xxx]:ppp format, the address is shifted left and the
- brackets are removed
-
-Returns: 0 if there is no port, else the port number. If there's a syntax
- error, leave the incoming address alone, and return 0.
-*/
-
-int
-host_address_extract_port(uschar *address)
-{
-int port = 0;
-uschar *endptr;
-
-/* Handle the "bracketed with colon on the end" format */
-
-if (*address == '[')
- {
- uschar *rb = address + 1;
- while (*rb != 0 && *rb != ']') rb++;
- if (*rb++ == 0) return 0; /* Missing ]; leave invalid address */
- if (*rb == ':')
- {
- port = Ustrtol(rb + 1, &endptr, 10);
- if (*endptr != 0) return 0; /* Invalid port; leave invalid address */
- }
- else if (*rb != 0) return 0; /* Bad syntax; leave invalid address */
- memmove(address, address + 1, rb - address - 2);
- rb[-2] = 0;
- }
-
-/* Handle the "dot on the end" format */
-
-else
- {
- int skip = -3; /* Skip 3 dots in IPv4 addresses */
- address--;
- while (*(++address) != 0)
- {
- int ch = *address;
- if (ch == ':') skip = 0; /* Skip 0 dots in IPv6 addresses */
- else if (ch == '.' && skip++ >= 0) break;
- }
- if (*address == 0) return 0;
- port = Ustrtol(address + 1, &endptr, 10);
- if (*endptr != 0) return 0; /* Invalid port; leave invalid address */
- *address = 0;
- }
-
-return port;
-}
-
-
/*************************************************
* Get port from a host item's name *
*************************************************/
address above. The field in the ip_address_item is large enough to hold an
IPv6 address. */
- next = store_get(sizeof(ip_address_item), FALSE);
+ next = store_get(sizeof(ip_address_item), list);
next->next = NULL;
Ustrcpy(next->address, s);
next->port = port;
{
ip_address_item *running_interfaces = NULL;
-if (local_interface_data == NULL)
+if (!local_interface_data)
{
void *reset_item = store_mark();
ip_address_item *dlist = host_build_ifacelist(CUS local_interfaces,
*/
uschar *
-host_ntoa(int type, const void *arg, uschar *buffer, int *portptr)
+host_ntoa(int type, const void * arg, uschar * buffer, int * portptr)
{
-uschar *yield;
+uschar * yield;
/* The new world. It is annoying that we have to fish out the address from
different places in the block, depending on what kind of address it is. It
struct sockaddr_in6 *sk = (struct sockaddr_in6 *)arg;
yield = US inet_ntop(family, &(sk->sin6_addr), CS addr_buffer,
sizeof(addr_buffer));
- if (portptr != NULL) *portptr = ntohs(sk->sin6_port);
+ if (portptr) *portptr = ntohs(sk->sin6_port);
}
else
{
struct sockaddr_in *sk = (struct sockaddr_in *)arg;
yield = US inet_ntop(family, &(sk->sin_addr), CS addr_buffer,
sizeof(addr_buffer));
- if (portptr != NULL) *portptr = ntohs(sk->sin_port);
+ if (portptr) *portptr = ntohs(sk->sin_port);
}
}
else
if (type < 0)
{
yield = US inet_ntoa(((struct sockaddr_in *)arg)->sin_addr);
- if (portptr != NULL) *portptr = ntohs(((struct sockaddr_in *)arg)->sin_port);
+ if (portptr) *portptr = ntohs(((struct sockaddr_in *)arg)->sin_port);
}
else
yield = US inet_ntoa(*((struct in_addr *)arg));
/* If there is no buffer, put the string into some new store. */
-if (!buffer) buffer = store_get(46, FALSE);
+if (!buffer) buffer = store_get(46, GET_UNTAINTED);
/* Callers of this function with a non-NULL buffer must ensure that it is
large enough to hold an IPv6 address, namely, at least 46 bytes. That's what
*/
int
-host_aton(const uschar *address, int *bin)
+host_aton(const uschar * address, int * bin)
{
int x[4];
int v4offset = 0;
if (Ustrchr(address, ':') != NULL)
{
- const uschar *p = address;
- const uschar *component[8];
+ const uschar * p = address;
+ const uschar * component[8];
BOOL ipv4_ends = FALSE;
- int ci = 0;
- int nulloffset = 0;
- int v6count = 8;
- int i;
+ int ci = 0, nulloffset = 0, v6count = 8, i;
/* If the address starts with a colon, it will start with two colons.
Just lose the first one, which will leave a null first component. */
overlooked; to guard against that happening again, check here and crash if
there are too many components. */
- while (*p != 0 && *p != '%')
+ while (*p && *p != '%')
{
int len = Ustrcspn(p, ":%");
if (len == 0) nulloffset = ci;
c++;
}
-c[-1] = '\0'; /* drop trailing colon */
+*--c = '\0'; /* drop trailing colon */
-/* debug_printf("%s: D k %d <%s> <%s>\n", __FUNCTION__, k, d, d + 2*(k+1)); */
+/* debug_printf("%s: D k %d <%s> <%s>\n", __FUNCTION__, k, buffer, buffer + 2*(k+1)); */
if (k >= 0)
{ /* collapse */
c = d + 2*(k+1);
host_is_tls_on_connect_port(int port)
{
int sep = 0;
-uschar buffer[32];
-const uschar *list = tls_in.on_connect_ports;
-uschar *s;
-uschar *end;
+const uschar * list = tls_in.on_connect_ports;
if (tls_in.on_connect) return TRUE;
-while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
+for (uschar * s, * end; s = string_nextinlist(&list, &sep, NULL, 0); )
if (Ustrtol(s, &end, 10) == port)
return TRUE;
static int
host_name_lookup_byaddr(void)
{
-int len;
-uschar *s, *t;
-struct hostent *hosts;
+struct hostent * hosts;
struct in_addr addr;
unsigned long time_msec = 0; /* init to quieten dumb static analysis */
if ( slow_lookup_log
&& (time_msec = get_time_in_ms() - time_msec) > slow_lookup_log
)
- log_long_lookup(US"name", sender_host_address, time_msec);
+ log_long_lookup(US"gethostbyaddr", sender_host_address, time_msec);
/* Failed to look up the host. */
if (hosts->h_aliases)
{
- int count = 1;
+ int count = 1; /* need 1 more for terminating NULL */
uschar **ptr;
for (uschar ** aliases = USS hosts->h_aliases; *aliases; aliases++) count++;
store_pool = POOL_PERM;
- ptr = sender_host_aliases = store_get(count * sizeof(uschar *), FALSE);
+ ptr = sender_host_aliases = store_get(count * sizeof(uschar *), GET_UNTAINTED);
store_pool = POOL_TAINT_PERM;
for (uschar ** aliases = USS hosts->h_aliases; *aliases; aliases++)
int sep = 0;
uschar *save_hostname;
uschar **aliases;
-uschar buffer[256];
uschar *ordername;
const uschar *list = host_lookup_order;
-dns_answer dnsa;
+dns_answer * dnsa = store_get_dns_answer();
dns_scan dnss;
sender_host_dnssec = host_lookup_deferred = host_lookup_failed = FALSE;
/* Do lookups directly in the DNS or via gethostbyaddr() (or equivalent), in
the order specified by the host_lookup_order option. */
-while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
+while ((ordername = string_nextinlist(&list, &sep, NULL, 0)))
{
if (strcmpic(ordername, US"bydns") == 0)
{
+ uschar * name = dns_build_reverse(sender_host_address);
+
dns_init(FALSE, FALSE, FALSE); /* dnssec ctrl by dns_dnssec_ok glbl */
- dns_build_reverse(sender_host_address, buffer);
- rc = dns_lookup_timerwrap(&dnsa, buffer, T_PTR, NULL);
+ rc = dns_lookup_timerwrap(dnsa, name, T_PTR, NULL);
/* The first record we come across is used for the name; others are
considered to be aliases. We have to scan twice, in order to find out the
{
uschar **aptr = NULL;
int ssize = 264;
- int count = 0;
+ int count = 1; /* need 1 more for terminating NULL */
int old_pool = store_pool;
- sender_host_dnssec = dns_is_secure(&dnsa);
+ sender_host_dnssec = dns_is_secure(dnsa);
DEBUG(D_dns)
debug_printf("Reverse DNS security status: %s\n",
sender_host_dnssec ? "DNSSEC verified (AD)" : "unverified");
store_pool = POOL_PERM; /* Save names in permanent storage */
- for (dns_record * rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
rr;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == T_PTR)
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == T_PTR)
count++;
/* Get store for the list of aliases. For compatibility with
gethostbyaddr, we make an empty list if there are none. */
- aptr = sender_host_aliases = store_get(count * sizeof(uschar *), FALSE);
+ aptr = sender_host_aliases = store_get(count * sizeof(uschar *), GET_UNTAINTED);
/* Re-scan and extract the names */
- for (dns_record * rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
rr;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == T_PTR)
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == T_PTR)
{
- uschar * s = store_get(ssize, TRUE); /* names are tainted */
+ uschar * s = store_get(ssize, GET_TAINTED); /* names are tainted */
+ unsigned slen;
/* If an overlong response was received, the data will have been
truncated and dn_expand may fail. */
- if (dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen,
+ if (dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen,
US (rr->data), (DN_EXPAND_ARG4_TYPE)(s), ssize) < 0)
{
log_write(0, LOG_MAIN, "host name alias list truncated for %s",
break;
}
- store_release_above(s + Ustrlen(s) + 1);
- if (!s[0])
+ store_release_above(s + (slen = Ustrlen(s)) + 1);
+ if (!*s)
{
HDEBUG(D_host_lookup) debug_printf("IP address lookup yielded an "
"empty name: treated as non-existent host name\n");
continue;
}
+ if (Ustrspn(s, letter_digit_hyphen_dot) != slen)
+ {
+ HDEBUG(D_host_lookup) debug_printf("IP address lookup yielded an "
+ "illegal name (bad char): treated as non-existent host name\n");
+ continue;
+ }
if (!sender_host_name) sender_host_name = s;
else *aptr++ = s;
while (*s) { *s = tolower(*s); s++; }
{
uschar **aliases = sender_host_aliases;
debug_printf("IP address lookup yielded \"%s\"\n", sender_host_name);
- while (*aliases != NULL) debug_printf(" alias \"%s\"\n", *aliases++);
+ while (*aliases) debug_printf(" alias \"%s\"\n", *aliases++);
}
/* We need to verify that a forward lookup on the name we found does indeed
int yield, times;
host_item *last = NULL;
BOOL temp_error = FALSE;
-#if HAVE_IPV6
int af;
+
+#ifndef DISABLE_TLS
+/* Copy the host name at this point to the value which is used for
+TLS certificate name checking, before anything modifies it. */
+
+host->certname = host->name;
#endif
/* Make sure DNS options are set as required. This appears to be necessary in
#ifdef STAND_ALONE
if (disable_ipv6)
#else
- if (disable_ipv6 ||
- (dns_ipv4_lookup != NULL &&
- match_isinlist(host->name, CUSS &dns_ipv4_lookup, 0, NULL, NULL,
- MCL_DOMAIN, TRUE, NULL) == OK))
+ if ( disable_ipv6
+ || dns_ipv4_lookup
+ && match_isinlist(host->name, CUSS &dns_ipv4_lookup, 0,
+ &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
#endif
{ af = AF_INET; times = 1; }
/* No IPv6 support */
#else /* HAVE_IPV6 */
- times = 1;
+ af = AF_INET; times = 1;
#endif /* HAVE_IPV6 */
/* Initialize the flag that gets set for DNS syntax check errors, so that the
#else /* not HAVE_IPV6 */
if (f.running_in_test_harness)
- hostdata = host_fake_gethostbyname(host->name, AF_INET, &error_num);
+ hostdata = host_fake_gethostbyname(host->name, af, &error_num);
else
{
hostdata = gethostbyname(CS host->name);
if ( slow_lookup_log
&& (time_msec = get_time_in_ms() - time_msec) > slow_lookup_log)
- log_long_lookup(US"name", host->name, time_msec);
+ log_long_lookup(US"gethostbyname", host->name, time_msec);
- if (hostdata == NULL)
+ if (!hostdata)
{
- uschar *error;
+ uschar * error;
switch (error_num)
{
- case HOST_NOT_FOUND: error = US"HOST_NOT_FOUND"; break;
- case TRY_AGAIN: error = US"TRY_AGAIN"; break;
- case NO_RECOVERY: error = US"NO_RECOVERY"; break;
- case NO_DATA: error = US"NO_DATA"; break;
- #if NO_DATA != NO_ADDRESS
- case NO_ADDRESS: error = US"NO_ADDRESS"; break;
- #endif
+ case HOST_NOT_FOUND: error = US"HOST_NOT_FOUND"; break;
+ case TRY_AGAIN: error = US"TRY_AGAIN"; temp_error = TRUE; break;
+ case NO_RECOVERY: error = US"NO_RECOVERY"; temp_error = TRUE; break;
+ case NO_DATA: error = US"NO_DATA"; break;
+ #if NO_DATA != NO_ADDRESS
+ case NO_ADDRESS: error = US"NO_ADDRESS"; break;
+ #endif
default: error = US"?"; break;
}
- DEBUG(D_host_lookup) debug_printf("%s returned %d (%s)\n",
- #if HAVE_IPV6
- #if HAVE_GETIPNODEBYNAME
- (af == AF_INET6)? "getipnodebyname(af=inet6)" : "getipnodebyname(af=inet)",
- #else
- (af == AF_INET6)? "gethostbyname2(af=inet6)" : "gethostbyname2(af=inet)",
- #endif
- #else
- "gethostbyname",
- #endif
- error_num, error);
+ DEBUG(D_host_lookup) debug_printf("%s(af=%s) returned %d (%s)\n",
+ f.running_in_test_harness ? "host_fake_gethostbyname" :
+#if HAVE_IPV6
+# if HAVE_GETIPNODEBYNAME
+ "getipnodebyname",
+# else
+ "gethostbyname2",
+# endif
+#else
+ "gethostbyname",
+#endif
+ af == AF_INET ? "inet" : "inet6", error_num, error);
- if (error_num == TRY_AGAIN || error_num == NO_RECOVERY) temp_error = TRUE;
continue;
}
- if ((hostdata->h_addr_list)[0] == NULL) continue;
+ if (!(hostdata->h_addr_list)[0]) continue;
/* Replace the name with the fully qualified one if necessary, and fill in
the fully_qualified_name pointer. */
- if (hostdata->h_name[0] != 0 &&
- Ustrcmp(host->name, hostdata->h_name) != 0)
+ if (hostdata->h_name[0] && Ustrcmp(host->name, hostdata->h_name) != 0)
host->name = string_copy_dnsdomain(US hostdata->h_name);
- if (fully_qualified_name != NULL) *fully_qualified_name = host->name;
+ if (fully_qualified_name) *fully_qualified_name = host->name;
/* Get the list of addresses. IPv4 and IPv6 addresses can be distinguished
by their different lengths. Scan the list, ignoring any that are to be
host_ntoa(ipv4_addr? AF_INET:AF_INET6, *addrlist, NULL, NULL);
#ifndef STAND_ALONE
- if (ignore_target_hosts != NULL &&
- verify_check_this_host(&ignore_target_hosts, NULL, host->name,
- text_address, NULL) == OK)
+ if ( ignore_target_hosts
+ && verify_check_this_host(&ignore_target_hosts, NULL, host->name,
+ text_address, NULL) == OK)
{
DEBUG(D_host_lookup)
debug_printf("ignored host %s [%s]\n", host->name, text_address);
}
#endif
- /* If this is the first address, last == NULL and we put the data in the
+ /* If this is the first address, last is NULL and we put the data in the
original block. */
- if (last == NULL)
+ if (!last)
{
host->address = text_address;
host->port = PORT_NONE;
else
{
- host_item *next = store_get(sizeof(host_item), FALSE);
+ host_item *next = store_get(sizeof(host_item), GET_UNTAINTED);
next->name = host->name;
+#ifndef DISABLE_TLS
+ next->certname = host->certname;
+#endif
next->mx = host->mx;
next->address = text_address;
next->port = PORT_NONE;
NULL. If temp_error is set, at least one of the lookups gave a temporary error,
so we pass that back. */
-if (host->address == NULL)
+if (!host->address)
{
uschar *msg =
- #ifndef STAND_ALONE
- (message_id[0] == 0 && smtp_in != NULL)?
- string_sprintf("no IP address found for host %s (during %s)", host->name,
+#ifndef STAND_ALONE
+ !message_id[0] && smtp_in
+ ? string_sprintf("no IP address found for host %s (during %s)", host->name,
smtp_get_connection_info()) :
- #endif
+#endif
string_sprintf("no IP address found for host %s", host->name);
HDEBUG(D_host_lookup) debug_printf("%s\n", msg);
RETURN_AGAIN:
{
- #ifndef STAND_ALONE
+#ifndef STAND_ALONE
int rc;
const uschar *save = deliver_domain;
deliver_domain = host->name; /* set $domain */
- rc = match_isinlist(host->name, CUSS &dns_again_means_nonexist, 0, NULL, NULL,
- MCL_DOMAIN, TRUE, NULL);
+ rc = match_isinlist(host->name, CUSS &dns_again_means_nonexist, 0,
+ &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL);
deliver_domain = save;
if (rc == OK)
{
"returning HOST_FIND_FAILED\n", host->name);
return HOST_FIND_FAILED;
}
- #endif
+#endif
return HOST_FIND_AGAIN;
}
}
BOOL v6_find_again = FALSE;
BOOL dnssec_fail = FALSE;
int i;
+dns_answer * dnsa;
+
+#ifndef DISABLE_TLS
+/* Copy the host name at this point to the value which is used for
+TLS certificate name checking, before any CNAME-following modifies it. */
+
+host->certname = host->name;
+#endif
/* If allow_ip is set, a name which is an IP address returns that value
as its address. This is used for MX records when allow_mx_to_ip is set, for
return HOST_FOUND;
}
+dnsa = store_get_dns_answer();
+
/* On an IPv6 system, unless IPv6 is disabled, go round the loop up to twice,
looking for AAAA records the first time. However, unless doing standalone
testing, we force an IPv4 lookup if the domain matches dns_ipv4_lookup global.
#ifndef STAND_ALONE
if ( disable_ipv6
|| !(whichrrs & HOST_FIND_BY_AAAA)
- || (dns_ipv4_lookup
- && match_isinlist(host->name, CUSS &dns_ipv4_lookup, 0, NULL, NULL,
- MCL_DOMAIN, TRUE, NULL) == OK)
+ || dns_ipv4_lookup
+ && match_isinlist(host->name, CUSS &dns_ipv4_lookup, 0,
+ &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK
)
i = 0; /* look up A records only */
else
int type = types[i];
int randoffset = i == (whichrrs & HOST_FIND_IPV4_FIRST ? 1 : 0)
? 500 : 0; /* Ensures v6/4 sort order */
- dns_answer dnsa;
dns_scan dnss;
- int rc = dns_lookup_timerwrap(&dnsa, host->name, type, fully_qualified_name);
+ int rc = dns_lookup_timerwrap(dnsa, host->name, type, fully_qualified_name);
lookup_dnssec_authenticated = !dnssec_request ? NULL
- : dns_is_secure(&dnsa) ? US"yes" : US"no";
+ : dns_is_secure(dnsa) ? US"yes" : US"no";
DEBUG(D_dns)
if ( (dnssec_request || dnssec_require)
- && !dns_is_secure(&dnsa)
- && dns_is_aa(&dnsa)
+ && !dns_is_secure(dnsa)
+ && dns_is_aa(dnsa)
)
debug_printf("DNS lookup of %.256s (A/AAAA) requested AD, but got AA\n", host->name);
{
if (i == 0) /* Just tried for an A record, i.e. end of loop */
{
- if (host->address != NULL) return HOST_FOUND; /* AAAA was found */
- if (rc == DNS_AGAIN || rc == DNS_FAIL || v6_find_again)
- return HOST_FIND_AGAIN;
- return HOST_FIND_FAILED; /* DNS_NOMATCH or DNS_NODATA */
+ if (host->address != NULL)
+ i = HOST_FOUND; /* AAAA was found */
+ else if (rc == DNS_AGAIN || rc == DNS_FAIL || v6_find_again)
+ i = HOST_FIND_AGAIN;
+ else
+ i = HOST_FIND_FAILED; /* DNS_NOMATCH or DNS_NODATA */
+ goto out;
}
/* Tried for an AAAA record: remember if this was a temporary
if (dnssec_request)
{
- if (dns_is_secure(&dnsa))
+ if (dns_is_secure(dnsa))
{
DEBUG(D_host_lookup) debug_printf("%s A DNSSEC\n", host->name);
if (host->dnssec == DS_UNK) /* set in host_find_bydns() */
fully_qualified_name = NULL;
- for (dns_record * rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
rr;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == type)
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == type)
{
- dns_address * da = dns_address_from_rr(&dnsa, rr);
+ dns_address * da = dns_address_from_rr(dnsa, rr);
DEBUG(D_host_lookup)
if (!da) debug_printf("no addresses extracted from A6 RR for %s\n",
/* Not a duplicate */
new_sort_key = host->mx * 1000 + random_number(500) + randoffset;
- next = store_get(sizeof(host_item), FALSE);
+ next = store_get(sizeof(host_item), GET_UNTAINTED);
/* New address goes first: insert the new block after the first one
(so as not to disturb the original pointer) but put the new address
/* Control gets here only if the second lookup (the A record) succeeded.
However, the address may not be filled in if it was ignored. */
-return host->address
+i = host->address
? HOST_FOUND
: dnssec_fail
? HOST_FIND_SECURITY
: HOST_IGNORED;
+
+out:
+ store_free_dns_answer(dnsa);
+ return i;
}
int rc = DNS_FAIL;
int ind_type = 0;
int yield;
-dns_answer dnsa;
+dns_answer * dnsa = store_get_dns_answer();
dns_scan dnss;
BOOL dnssec_require = dnssec_d
- && match_isinlist(host->name, CUSS &dnssec_d->require,
- 0, NULL, NULL, MCL_DOMAIN, TRUE, NULL) == OK;
+ && match_isinlist(host->name, CUSS &dnssec_d->require,
+ 0, &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK;
BOOL dnssec_request = dnssec_require
- || ( dnssec_d
- && match_isinlist(host->name, CUSS &dnssec_d->request,
- 0, NULL, NULL, MCL_DOMAIN, TRUE, NULL) == OK);
+ || ( dnssec_d
+ && match_isinlist(host->name, CUSS &dnssec_d->request,
+ 0, &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK);
dnssec_status_t dnssec;
/* Set the default fully qualified name to the incoming name, initialize the
dnssec = DS_UNK;
lookup_dnssec_authenticated = NULL;
- rc = dns_lookup_timerwrap(&dnsa, temp_fully_qualified_name, ind_type,
+ rc = dns_lookup_timerwrap(dnsa, temp_fully_qualified_name, ind_type,
CUSS &temp_fully_qualified_name);
DEBUG(D_dns)
if ((dnssec_request || dnssec_require)
- && !dns_is_secure(&dnsa)
- && dns_is_aa(&dnsa))
+ && !dns_is_secure(dnsa)
+ && dns_is_aa(dnsa))
debug_printf("DNS lookup of %.256s (SRV) requested AD, but got AA\n", host->name);
if (dnssec_request)
{
- if (dns_is_secure(&dnsa))
+ if (dns_is_secure(dnsa))
{ dnssec = DS_YES; lookup_dnssec_authenticated = US"yes"; }
else
{ dnssec = DS_NO; lookup_dnssec_authenticated = US"no"; }
/* On DNS failures, we give the "try again" error unless the domain is
listed as one for which we continue. */
- if (rc == DNS_SUCCEED && dnssec_require && !dns_is_secure(&dnsa))
+ if (rc == DNS_SUCCEED && dnssec_require && !dns_is_secure(dnsa))
{
log_write(L_host_lookup_failed, LOG_MAIN,
"dnssec fail on SRV for %.256s", host->name);
}
if (rc == DNS_FAIL || rc == DNS_AGAIN)
{
- #ifndef STAND_ALONE
- if (match_isinlist(host->name, CUSS &srv_fail_domains, 0, NULL, NULL,
- MCL_DOMAIN, TRUE, NULL) != OK)
- #endif
+#ifndef STAND_ALONE
+ if (match_isinlist(host->name, CUSS &srv_fail_domains, 0,
+ &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) != OK)
+#endif
{ yield = HOST_FIND_AGAIN; goto out; }
DEBUG(D_host_lookup) debug_printf("DNS_%s treated as DNS_NODATA "
- "(domain in srv_fail_domains)\n", (rc == DNS_FAIL)? "FAIL":"AGAIN");
+ "(domain in srv_fail_domains)\n", rc == DNS_FAIL ? "FAIL":"AGAIN");
}
}
ind_type = T_MX;
dnssec = DS_UNK;
lookup_dnssec_authenticated = NULL;
- rc = dns_lookup_timerwrap(&dnsa, host->name, ind_type, fully_qualified_name);
+ rc = dns_lookup_timerwrap(dnsa, host->name, ind_type, fully_qualified_name);
DEBUG(D_dns)
if ( (dnssec_request || dnssec_require)
- && !dns_is_secure(&dnsa)
- && dns_is_aa(&dnsa))
+ && !dns_is_secure(dnsa)
+ && dns_is_aa(dnsa))
debug_printf("DNS lookup of %.256s (MX) requested AD, but got AA\n", host->name);
if (dnssec_request)
- if (dns_is_secure(&dnsa))
+ if (dns_is_secure(dnsa))
{
- DEBUG(D_host_lookup) debug_printf("%s MX DNSSEC\n", host->name);
+ DEBUG(D_host_lookup) debug_printf("%s (MX resp) DNSSEC\n", host->name);
dnssec = DS_YES; lookup_dnssec_authenticated = US"yes";
}
else
yield = HOST_FIND_FAILED; goto out;
case DNS_SUCCEED:
- if (!dnssec_require || dns_is_secure(&dnsa))
+ if (!dnssec_require || dns_is_secure(dnsa))
break;
DEBUG(D_host_lookup)
debug_printf("dnssec fail on MX for %.256s", host->name);
#ifndef STAND_ALONE
- if (match_isinlist(host->name, CUSS &mx_fail_domains, 0, NULL, NULL,
- MCL_DOMAIN, TRUE, NULL) != OK)
+ if (match_isinlist(host->name, CUSS &mx_fail_domains, 0,
+ &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) != OK)
{ yield = HOST_FIND_SECURITY; goto out; }
#endif
rc = DNS_FAIL;
case DNS_FAIL:
case DNS_AGAIN:
#ifndef STAND_ALONE
- if (match_isinlist(host->name, CUSS &mx_fail_domains, 0, NULL, NULL,
- MCL_DOMAIN, TRUE, NULL) != OK)
+ if (match_isinlist(host->name, CUSS &mx_fail_domains, 0,
+ &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) != OK)
#endif
{ yield = HOST_FIND_AGAIN; goto out; }
DEBUG(D_host_lookup) debug_printf("DNS_%s treated as DNS_NODATA "
last = NULL; /* Indicates that not even the first item is filled yet */
-for (dns_record * rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
+for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS);
rr;
- rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == ind_type)
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == ind_type)
{
int precedence, weight;
int port = PORT_NONE;
/* Get the name of the host pointed to. */
- (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, s,
+ (void)dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, s,
(DN_EXPAND_ARG4_TYPE)data, sizeof(data));
/* Check that we haven't already got this host on the chain; if we have,
/* Make a new host item and seek the correct insertion place */
{
int sort_key = precedence * 1000 + weight;
- host_item *next = store_get(sizeof(host_item), FALSE);
+ host_item * next = store_get(sizeof(host_item), GET_UNTAINTED);
next->name = string_copy_dnsdomain(data);
next->address = NULL;
next->port = port;
out:
dns_init(FALSE, FALSE, FALSE); /* clear the dnssec bit for getaddrbyname */
+store_free_dns_answer(dnsa);
return yield;
}
+
+
+
+#ifdef SUPPORT_DANE
+/* Lookup TLSA record for host/port.
+Return: OK success with dnssec; DANE mode
+ DEFER Do not use this host now, may retry later
+ FAIL_FORCED No TLSA record; DANE not usable
+ FAIL Do not use this connection
+*/
+
+int
+tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
+{
+uschar buffer[300];
+const uschar * fullname = buffer;
+int rc;
+BOOL sec;
+
+/* TLSA lookup string */
+(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
+
+rc = dns_lookup_timerwrap(dnsa, buffer, T_TLSA, &fullname);
+sec = dns_is_secure(dnsa);
+DEBUG(D_transport)
+ debug_printf("TLSA lookup ret %s %sDNSSEC\n", dns_rc_names[rc], sec ? "" : "not ");
+
+switch (rc)
+ {
+ case DNS_AGAIN:
+ return DEFER; /* just defer this TLS'd conn */
+
+ case DNS_SUCCEED:
+ if (sec)
+ {
+ DEBUG(D_transport)
+ {
+ dns_scan dnss;
+ for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
+ rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
+ if (rr->type == T_TLSA && rr->size > 3)
+ {
+ uint16_t payload_length = rr->size - 3;
+ uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
+
+ sp += sprintf(CS sp, "%d ", *p++); /* usage */
+ sp += sprintf(CS sp, "%d ", *p++); /* selector */
+ sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
+ while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
+ sp += sprintf(CS sp, "%02x", *p++);
+
+ debug_printf(" %s\n", s);
+ }
+ }
+ return OK;
+ }
+ log_write(0, LOG_MAIN,
+ "DANE error: TLSA lookup for %s not DNSSEC", host->name);
+ /*FALLTRHOUGH*/
+
+ case DNS_NODATA: /* no TLSA RR for this lookup */
+ case DNS_NOMATCH: /* no records at all for this lookup */
+ return dane_required ? FAIL : FAIL_FORCED;
+
+ default:
+ case DNS_FAIL:
+ return dane_required ? FAIL : DEFER;
+ }
+}
+#endif /*SUPPORT_DANE*/
+
+
+
/*************************************************
**************************************************
* Stand-alone test program *
disable_ipv6 = FALSE;
primary_hostname = US"";
+store_init();
store_pool = POOL_MAIN;
debug_selector = D_host_lookup|D_interface;
debug_file = stdout;
git://git.exim.org / exim.git / blobdiff