-/* $Cambridge: exim/src/src/host.c,v 1.23 2006/03/17 16:51:45 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for finding hosts, either by gethostbyname(), gethostbyaddr(), or
very good for the uses to which it is put. When running the regression tests,
start with a fixed seed.
+If you need better, see vaguely_random_number() which is potentially stronger,
+if a crypto library is available, but might end up just calling this instead.
+
Arguments:
limit: one more than the largest number required
int
random_number(int limit)
{
+if (limit < 1)
+ return 0;
if (random_seed == 0)
{
if (running_in_test_harness) random_seed = 42; else
return (unsigned int)(random_seed >> 16) % limit;
}
+/*************************************************
+* Wrappers for logging lookup times *
+*************************************************/
+
+/* When the 'slow_lookup_log' variable is enabled, these wrappers will
+write to the log file all (potential) dns lookups that take more than
+slow_lookup_log milliseconds
+*/
+
+static void
+log_long_lookup(const uschar * type, const uschar * data, unsigned long msec)
+{
+log_write(0, LOG_MAIN, "Long %s lookup for '%s': %lu msec",
+ type, data, msec);
+}
+
+
+/* returns the current system epoch time in milliseconds. */
+static unsigned long
+get_time_in_ms()
+{
+struct timeval tmp_time;
+unsigned long seconds, microseconds;
+
+gettimeofday(&tmp_time, NULL);
+seconds = (unsigned long) tmp_time.tv_sec;
+microseconds = (unsigned long) tmp_time.tv_usec;
+return seconds*1000 + microseconds/1000;
+}
+
+
+static int
+dns_lookup_timerwrap(dns_answer *dnsa, const uschar *name, int type,
+ const uschar **fully_qualified_name)
+{
+int retval;
+unsigned long time_msec;
+
+if (!slow_lookup_log)
+ return dns_lookup(dnsa, name, type, fully_qualified_name);
+
+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);
+return retval;
+}
/*************************************************
*************************************************/
/* This function is called instead of gethostbyname(), gethostbyname2(), or
-getipnodebyname() when running in the test harness. It recognizes the name
-"manyhome.test.ex" and generates a humungous number of IP addresses. It also
+getipnodebyname() when running in the test harness. . It also
recognizes an unqualified "localhost" and forces it to the appropriate loopback
address. IP addresses are treated as literals. For other names, it uses the DNS
to find the host name. In the test harness, this means it will access only the
*/
static struct hostent *
-host_fake_gethostbyname(uschar *name, int af, int *error_num)
+host_fake_gethostbyname(const uschar *name, int af, int *error_num)
{
#if HAVE_IPV6
int alen = (af == AF_INET)? sizeof(struct in_addr):sizeof(struct in6_addr);
#endif
int ipa;
-uschar *lname = name;
+const uschar *lname = name;
uschar *adds;
uschar **alist;
struct hostent *yield;
debug_printf("using host_fake_gethostbyname for %s (%s)\n", name,
(af == AF_INET)? "IPv4" : "IPv6");
-/* Handle the name that needs a vast number of IP addresses */
-
-if (Ustrcmp(name, "manyhome.test.ex") == 0 && af == AF_INET)
- {
- int i, j;
- yield = store_get(sizeof(struct hostent));
- alist = store_get(2049 * sizeof(char *));
- adds = store_get(2048 * alen);
- yield->h_name = CS name;
- yield->h_aliases = NULL;
- yield->h_addrtype = af;
- yield->h_length = alen;
- yield->h_addr_list = CSS alist;
- for (i = 104; i <= 111; i++)
- {
- for (j = 0; j <= 255; j++)
- {
- *alist++ = adds;
- *adds++ = 10;
- *adds++ = 250;
- *adds++ = i;
- *adds++ = j;
- }
- }
- *alist = NULL;
- return yield;
- }
-
/* Handle unqualified "localhost" */
if (Ustrcmp(name, "localhost") == 0)
else
{
int type = (af == AF_INET)? T_A:T_AAAA;
- int rc = dns_lookup(&dnsa, lname, type, NULL);
+ int rc = dns_lookup_timerwrap(&dnsa, lname, type, NULL);
int count = 0;
+ lookup_dnssec_authenticated = NULL;
+
switch(rc)
{
case DNS_SUCCEED: break;
}
for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
+ rr;
rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- {
- if (rr->type == type) count++;
- }
+ if (rr->type == type)
+ count++;
yield = store_get(sizeof(struct hostent));
- alist = store_get((count + 1) * sizeof(char **));
+ alist = store_get((count + 1) * sizeof(char *));
adds = store_get(count *alen);
yield->h_name = CS name;
yield->h_addr_list = CSS alist;
for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
+ rr;
rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
{
int i, n;
int x[4];
dns_address *da;
if (rr->type != type) continue;
- da = dns_address_from_rr(&dnsa, rr);
+ if (!(da = dns_address_from_rr(&dnsa, rr))) break;
*alist++ = adds;
n = host_aton(da->address, x);
for (i = 0; i < n; i++)
*/
void
-host_build_hostlist(host_item **anchor, uschar *list, BOOL randomize)
+host_build_hostlist(host_item **anchor, const uschar *list, BOOL randomize)
{
int sep = 0;
int fake_mx = MX_NONE; /* This value is actually -1 */
uschar *name;
-uschar buffer[1024];
if (list == NULL) return;
if (randomize) fake_mx--; /* Start at -2 for randomizing */
*anchor = NULL;
-while ((name = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
+while ((name = string_nextinlist(&list, &sep, NULL, 0)) != NULL)
{
host_item *h;
}
h = store_get(sizeof(host_item));
- h->name = string_copy(name);
+ h->name = name;
h->address = NULL;
h->port = PORT_NONE;
h->mx = fake_mx;
int
host_item_get_port(host_item *h)
{
-uschar *p;
+const uschar *p;
int port, x;
int len = Ustrlen(h->name);
domain. Sigh. */
address = string_sprintf("[%s]:%d", sender_host_address, sender_host_port);
-if ((log_extra_selector & LX_incoming_port) == 0 || sender_host_port <= 0)
+if (!LOGGING(incoming_port) || sender_host_port <= 0)
*(Ustrrchr(address, ':')) = 0;
/* If there's no EHLO/HELO data, we can't show it. */
{
uschar *flag = useflag? US"H=" : US"";
uschar *iface = US"";
- if ((log_extra_selector & LX_incoming_interface) != 0 &&
- interface_address != NULL)
+ if (LOGGING(incoming_interface) && interface_address != NULL)
iface = string_sprintf(" I=[%s]:%d", interface_address, interface_port);
if (sender_ident == NULL)
(void)string_format(big_buffer, big_buffer_size, "%s%s%s",
*/
ip_address_item *
-host_build_ifacelist(uschar *list, uschar *name)
+host_build_ifacelist(const uschar *list, uschar *name)
{
int sep = 0;
uschar *s;
if (local_interface_data == NULL)
{
void *reset_item = store_get(0);
- ip_address_item *dlist = host_build_ifacelist(local_interfaces,
+ ip_address_item *dlist = host_build_ifacelist(CUS local_interfaces,
US"local_interfaces");
- ip_address_item *xlist = host_build_ifacelist(extra_local_interfaces,
+ ip_address_item *xlist = host_build_ifacelist(CUS extra_local_interfaces,
US"extra_local_interfaces");
ip_address_item *ipa;
*/
int
-host_aton(uschar *address, int *bin)
+host_aton(const uschar *address, int *bin)
{
int x[4];
int v4offset = 0;
if (Ustrchr(address, ':') != NULL)
{
- uschar *p = address;
- uschar *component[8];
+ const uschar *p = address;
+ const uschar *component[8];
BOOL ipv4_ends = FALSE;
int ci = 0;
int nulloffset = 0;
/* Handle IPv4 address */
(void)sscanf(CS address, "%d.%d.%d.%d", x, x+1, x+2, x+3);
-bin[v4offset] = (x[0] << 24) + (x[1] << 16) + (x[2] << 8) + x[3];
+bin[v4offset] = ((uint)x[0] << 24) + (x[1] << 16) + (x[2] << 8) + x[3];
return v4offset+1;
}
if (mask == 0) wordmask = 0;
else if (mask < 32)
{
- wordmask = (-1) << (32 - mask);
+ wordmask = (uint)(-1) << (32 - mask);
mask = 0;
}
else
{
j = binary[0];
for (i = 24; i >= 0; i -= 8)
- {
- sprintf(CS tt, "%d.", (j >> i) & 255);
- while (*tt) tt++;
- }
+ tt += sprintf(CS tt, "%d.", (j >> i) & 255);
}
else
- {
for (i = 0; i < 4; i++)
{
j = binary[i];
- sprintf(CS tt, "%04x%c%04x%c", (j >> 16) & 0xffff, sep, j & 0xffff, sep);
- while (*tt) tt++;
+ tt += sprintf(CS tt, "%04x%c%04x%c", (j >> 16) & 0xffff, sep, j & 0xffff, sep);
}
- }
tt--; /* lose final separator */
}
+/* Like host_nmtoa() but: ipv6-only, canonical output, no mask
+
+Arguments:
+ binary points to the ints
+ buffer big enough to hold the result
+
+Returns: the number of characters placed in buffer, not counting
+ the final nul.
+*/
+
+int
+ipv6_nmtoa(int * binary, uschar * buffer)
+{
+int i, j, k;
+uschar * c = buffer;
+uschar * d = NULL; /* shut insufficiently "clever" compiler up */
+
+for (i = 0; i < 4; i++)
+ { /* expand to text */
+ j = binary[i];
+ c += sprintf(CS c, "%x:%x:", (j >> 16) & 0xffff, j & 0xffff);
+ }
+
+for (c = buffer, k = -1, i = 0; i < 8; i++)
+ { /* find longest 0-group sequence */
+ if (*c == '0') /* must be "0:" */
+ {
+ uschar * s = c;
+ j = i;
+ while (c[2] == '0') i++, c += 2;
+ if (i-j > k)
+ {
+ k = i-j; /* length of sequence */
+ d = s; /* start of sequence */
+ }
+ }
+ while (*++c != ':') ;
+ c++;
+ }
+
+c[-1] = '\0'; /* drop trailing colon */
+
+/* debug_printf("%s: D k %d <%s> <%s>\n", __FUNCTION__, k, d, d + 2*(k+1)); */
+if (k >= 0)
+ { /* collapse */
+ c = d + 2*(k+1);
+ if (d == buffer) c--; /* need extra colon */
+ *d++ = ':'; /* 1st 0 */
+ while ((*d++ = *c++)) ;
+ }
+else
+ d = c;
+
+return d - buffer;
+}
+
+
/*************************************************
* Check port for tls_on_connect *
{
int sep = 0;
uschar buffer[32];
-uschar *list = tls_on_connect_ports;
+const uschar *list = tls_in.on_connect_ports;
uschar *s;
+uschar *end;
-if (tls_on_connect) return TRUE;
+if (tls_in.on_connect) return TRUE;
-while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
- {
- uschar *end;
- int lport = Ustrtol(s, &end, 10);
- if (*end != 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "tls_on_connect_ports "
- "contains \"%s\", which is not a port number: exim abandoned", s);
- if (lport == port) return TRUE;
- }
+while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
+ if (Ustrtol(s, &end, 10) == port)
+ return TRUE;
return FALSE;
}
*/
BOOL
-host_is_in_net(uschar *host, uschar *net, int maskoffset)
+host_is_in_net(const uschar *host, const uschar *net, int maskoffset)
{
int i;
int address[4];
if (mlen == 0) mask = 0;
else if (mlen < 32)
{
- mask = (-1) << (32 - mlen);
+ mask = (uint)(-1) << (32 - mlen);
mlen = 0;
}
else
if (hosts_treat_as_local != NULL)
{
int rc;
- uschar *save = deliver_domain;
+ const uschar *save = deliver_domain;
deliver_domain = h->name; /* set $domain */
- rc = match_isinlist(string_copylc(h->name), &hosts_treat_as_local, 0,
+ rc = match_isinlist(string_copylc(h->name), CUSS &hosts_treat_as_local, 0,
&domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL);
deliver_domain = save;
if (rc == OK) goto FOUND_LOCAL;
uschar *s, *t;
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();
/* Lookup on IPv6 system */
hosts = gethostbyaddr(CS(&addr), sizeof(addr), AF_INET);
#endif
+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);
+
/* Failed to look up the host. */
if (hosts == NULL)
treat this as non-existent. In some operating systems, this is returned as an
empty string; in others as a single dot. */
-if (hosts->h_name[0] == 0 || hosts->h_name[0] == '.')
+if (hosts->h_name == NULL || hosts->h_name[0] == 0 || hosts->h_name[0] == '.')
{
HDEBUG(D_host_lookup) debug_printf("IP address lookup yielded an empty name: "
"treated as non-existent host name\n");
uschar **aliases;
uschar buffer[256];
uschar *ordername;
-uschar *list = host_lookup_order;
+const uschar *list = host_lookup_order;
dns_record *rr;
dns_answer dnsa;
dns_scan dnss;
-host_lookup_deferred = host_lookup_failed = FALSE;
+sender_host_dnssec = host_lookup_deferred = host_lookup_failed = FALSE;
HDEBUG(D_host_lookup)
debug_printf("looking up host name for %s\n", sender_host_address);
/* 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)))
- != NULL)
+while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
{
if (strcmpic(ordername, US"bydns") == 0)
{
- dns_init(FALSE, FALSE);
+ dns_init(FALSE, FALSE, FALSE); /* dnssec ctrl by dns_dnssec_ok glbl */
dns_build_reverse(sender_host_address, buffer);
- rc = dns_lookup(&dnsa, buffer, T_PTR, NULL);
+ rc = dns_lookup_timerwrap(&dnsa, buffer, 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
int count = 0;
int old_pool = store_pool;
+ 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 (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
+ rr;
rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
- {
- if (rr->type == T_PTR) count++;
- }
+ 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. */
/* Re-scan and extract the names */
for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
+ rr;
rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
{
uschar *s = NULL;
"empty name: treated as non-existent host name\n");
continue;
}
- if (sender_host_name == NULL) sender_host_name = s;
- else *aptr++ = s;
+ if (!sender_host_name) sender_host_name = s;
+ else *aptr++ = s;
while (*s != 0) { *s = tolower(*s); s++; }
}
HDEBUG(D_host_lookup)
{
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++);
+ debug_printf("IP address lookup yielded \"%s\"\n", sender_host_name);
+ while (*aliases != NULL) debug_printf(" alias \"%s\"\n", *aliases++);
}
/* We need to verify that a forward lookup on the name we found does indeed
int rc;
BOOL ok = FALSE;
host_item h;
+ dnssec_domains d;
+
h.next = NULL;
h.name = hname;
h.mx = MX_NONE;
h.address = NULL;
+ d.request = sender_host_dnssec ? US"*" : NULL;;
+ d.require = NULL;
- /* When called with the 5th argument FALSE, host_find_byname() won't return
- HOST_FOUND_LOCAL. If the incoming address is an IPv4 address expressed in
- IPv6 format, we must compare the IPv4 part to any IPv4 addresses. */
-
- if ((rc = host_find_byname(&h, NULL, NULL, FALSE)) == HOST_FOUND)
+ if ( (rc = host_find_bydns(&h, NULL, HOST_FIND_BY_A,
+ NULL, NULL, NULL, &d, NULL, NULL)) == HOST_FOUND
+ || rc == HOST_FOUND_LOCAL
+ )
{
host_item *hh;
HDEBUG(D_host_lookup) debug_printf("checking addresses for %s\n", hname);
+
+ /* If the forward lookup was not secure we cancel the is-secure variable */
+
+ DEBUG(D_dns) debug_printf("Forward DNS security status: %s\n",
+ h.dnssec == DS_YES ? "DNSSEC verified (AD)" : "unverified");
+ if (h.dnssec != DS_YES) sender_host_dnssec = FALSE;
+
for (hh = &h; hh != NULL; hh = hh->next)
- {
if (host_is_in_net(hh->address, sender_host_address, 0))
{
HDEBUG(D_host_lookup) debug_printf(" %s OK\n", hh->address);
break;
}
else
- {
HDEBUG(D_host_lookup) debug_printf(" %s\n", hh->address);
- }
- }
+
if (!ok) HDEBUG(D_host_lookup)
debug_printf("no IP address for %s matched %s\n", hname,
sender_host_address);
{
HDEBUG(D_host_lookup) debug_printf("temporary error for host name lookup\n");
host_lookup_deferred = TRUE;
+ sender_host_name = NULL;
return DEFER;
}
else
- {
HDEBUG(D_host_lookup) debug_printf("no IP addresses found for %s\n", hname);
- }
/* If this name is no good, and it's the sender name, set it null pro tem;
if it's an alias, just remove it from the list. */
*************************************************/
/* The input is a host_item structure with the name filled in and the address
-field set to NULL. We use gethostbyname(). Of course, gethostbyname() may use
-the DNS, but it doesn't do MX processing. If more than one address is given,
-chain on additional host items, with other relevant fields copied.
+field set to NULL. We use gethostbyname() or getipnodebyname() or
+gethostbyname2(), as appropriate. Of course, these functions may use the DNS,
+but they do not do MX processing. It appears, however, that in some systems the
+current setting of resolver options is used when one of these functions calls
+the resolver. For this reason, we call dns_init() at the start, with arguments
+influenced by bits in "flags", just as we do for host_find_bydns().
The second argument provides a host list (usually an IP list) of hosts to
ignore. This makes it possible to ignore IPv6 link-local addresses or loopback
multiple IP addresses cause other host items to be
chained on.
ignore_target_hosts a list of hosts to ignore
+ flags HOST_FIND_QUALIFY_SINGLE ) passed to
+ HOST_FIND_SEARCH_PARENTS ) dns_init()
fully_qualified_name if not NULL, set to point to host name for
compatibility with host_find_bydns
local_host_check TRUE if a check for the local host is wanted
*/
int
-host_find_byname(host_item *host, uschar *ignore_target_hosts,
- uschar **fully_qualified_name, BOOL local_host_check)
+host_find_byname(host_item *host, const uschar *ignore_target_hosts, int flags,
+ const uschar **fully_qualified_name, BOOL local_host_check)
{
int i, yield, times;
uschar **addrlist;
int af;
#endif
-/* If we are in the test harness, a name ending in .test.again.dns always
-forces a temporary error response. */
+/* Make sure DNS options are set as required. This appears to be necessary in
+some circumstances when the get..byname() function actually calls the DNS. */
-if (running_in_test_harness)
- {
- uschar *endname = host->name + Ustrlen(host->name);
- if (Ustrcmp(endname - 14, "test.again.dns") == 0)
- return HOST_FIND_AGAIN;
- }
+dns_init((flags & HOST_FIND_QUALIFY_SINGLE) != 0,
+ (flags & HOST_FIND_SEARCH_PARENTS) != 0,
+ FALSE); /* Cannot retrieve dnssec status so do not request */
/* In an IPv6 world, unless IPv6 has been disabled, we need to scan for both
kinds of address, so go round the loop twice. Note that we have ensured that
lookups here (except when testing standalone). */
#if HAVE_IPV6
- #ifndef STAND_ALONE
- if (disable_ipv6 || (dns_ipv4_lookup != NULL &&
- match_isinlist(host->name, &dns_ipv4_lookup, 0, NULL, NULL, MCL_DOMAIN,
- TRUE, NULL) == OK))
+ #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))
+ #endif
+
{ af = AF_INET; times = 1; }
else
- #endif /* STAND_ALONE */
-
{ af = AF_INET6; times = 2; }
/* No IPv6 support */
i++)
{
BOOL ipv4_addr;
- int error_num;
+ int error_num = 0;
struct hostent *hostdata;
+ unsigned long time_msec = 0; /* compiler quietening */
+
+ #ifdef STAND_ALONE
+ printf("Looking up: %s\n", host->name);
+ #endif
+
+ if (slow_lookup_log) time_msec = get_time_in_ms();
#if HAVE_IPV6
if (running_in_test_harness)
}
#endif /* HAVE_IPV6 */
+ if ( slow_lookup_log
+ && (time_msec = get_time_in_ms() - time_msec) > slow_lookup_log)
+ log_long_lookup(US"name", host->name, time_msec);
+
if (hostdata == NULL)
{
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;
+ 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;
+ case NO_ADDRESS: error = US"NO_ADDRESS"; break;
#endif
default: error = US"?"; break;
}
host->port = PORT_NONE;
host->status = hstatus_unknown;
host->why = hwhy_unknown;
+ host->dnssec = DS_UNK;
last = host;
}
next->port = PORT_NONE;
next->status = hstatus_unknown;
next->why = hwhy_unknown;
+ next->dnssec = DS_UNK;
next->last_try = 0;
next->next = last->next;
last->next = next;
string_sprintf("no IP address found for host %s", host->name);
HDEBUG(D_host_lookup) debug_printf("%s\n", msg);
- if (temp_error) return HOST_FIND_AGAIN;
+ if (temp_error) goto RETURN_AGAIN;
if (host_checking || !log_testing_mode)
log_write(L_host_lookup_failed, LOG_MAIN, "%s", msg);
return HOST_FIND_FAILED;
HDEBUG(D_host_lookup)
{
- host_item *h;
+ const host_item *h;
if (fully_qualified_name != NULL)
debug_printf("fully qualified name = %s\n", *fully_qualified_name);
debug_printf("%s looked up these IP addresses:\n",
/* Return the found status. */
return yield;
+
+/* Handle the case when there is a temporary error. If the name matches
+dns_again_means_nonexist, return permanent rather than temporary failure. */
+
+RETURN_AGAIN:
+ {
+ #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);
+ deliver_domain = save;
+ if (rc == OK)
+ {
+ DEBUG(D_host_lookup) debug_printf("%s is in dns_again_means_nonexist: "
+ "returning HOST_FIND_FAILED\n", host->name);
+ return HOST_FIND_FAILED;
+ }
+ #endif
+ return HOST_FIND_AGAIN;
+ }
}
fully_qualified_name if not NULL, return fully qualified name here if
the contents are different (i.e. it must be preset
to something)
+ dnssec_request if TRUE request the AD bit
+ dnssec_require if TRUE require the AD bit
Returns: HOST_FIND_FAILED couldn't find A record
HOST_FIND_AGAIN try again later
static int
set_address_from_dns(host_item *host, host_item **lastptr,
- uschar *ignore_target_hosts, BOOL allow_ip, uschar **fully_qualified_name)
+ const uschar *ignore_target_hosts, BOOL allow_ip,
+ const uschar **fully_qualified_name,
+ BOOL dnssec_request, BOOL dnssec_require)
{
dns_record *rr;
host_item *thishostlast = NULL; /* Indicates not yet filled in anything */
return HOST_FOUND;
}
-/* On an IPv6 system, unless IPv6 is disabled, go round the loop up to three
-times, looking for A6 and AAAA records the first two times. However, unless
+/* 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 is set. Since A6 records look like being abandoned, support
-them only if explicitly configured to do so. On an IPv4 system, go round the
+dns_ipv4_lookup is set. On an IPv4 system, go round the
loop once only, looking only for A records. */
#if HAVE_IPV6
#ifndef STAND_ALONE
if (disable_ipv6 || (dns_ipv4_lookup != NULL &&
- match_isinlist(host->name, &dns_ipv4_lookup, 0, NULL, NULL, MCL_DOMAIN,
- TRUE, NULL) == OK))
+ match_isinlist(host->name, CUSS &dns_ipv4_lookup, 0, NULL, NULL,
+ MCL_DOMAIN, TRUE, NULL) == OK))
i = 0; /* look up A records only */
else
#endif /* STAND_ALONE */
- #ifdef SUPPORT_A6
- i = 2; /* look up A6 and AAAA and A records */
- #else
i = 1; /* look up AAAA and A records */
- #endif /* SUPPORT_A6 */
/* The IPv4 world */
for (; i >= 0; i--)
{
- static int types[] = { T_A, T_AAAA, T_A6 };
+ static int types[] = { T_A, T_AAAA };
int type = types[i];
int randoffset = (i == 0)? 500 : 0; /* Ensures v6 sorts before v4 */
dns_answer dnsa;
dns_scan dnss;
- int rc = dns_lookup(&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";
+
+ DEBUG(D_dns)
+ if ( (dnssec_request || dnssec_require)
+ && !dns_is_secure(&dnsa)
+ && dns_is_aa(&dnsa)
+ )
+ debug_printf("DNS lookup of %.256s (A/AAAA) requested AD, but got AA\n", host->name);
- /* We want to return HOST_FIND_AGAIN if one of the A, A6, or AAAA lookups
+ /* We want to return HOST_FIND_AGAIN if one of the A or AAAA lookups
fails or times out, but not if another one succeeds. (In the early
IPv6 days there are name servers that always fail on AAAA, but are happy
to give out an A record. We want to proceed with that A record.) */
{
if (i == 0) /* Just tried for an A record, i.e. end of loop */
{
- if (host->address != NULL) return HOST_FOUND; /* A6 or AAAA was found */
+ 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 */
}
- /* Tried for an A6 or AAAA record: remember if this was a temporary
+ /* Tried for an AAAA record: remember if this was a temporary
error, and look for the next record type. */
if (rc != DNS_NOMATCH && rc != DNS_NODATA) v6_find_again = TRUE;
continue;
}
+ if (dnssec_request)
+ {
+ 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() */
+ host->dnssec = DS_YES;
+ }
+ else
+ {
+ if (dnssec_require)
+ {
+ log_write(L_host_lookup_failed, LOG_MAIN,
+ "dnssec fail on %s for %.256s",
+ i>0 ? "AAAA" : "A", host->name);
+ continue;
+ }
+ if (host->dnssec == DS_YES) /* set in host_find_bydns() */
+ {
+ DEBUG(D_host_lookup) debug_printf("%s A cancel DNSSEC\n", host->name);
+ host->dnssec = DS_NO;
+ lookup_dnssec_authenticated = US"no";
+ }
+ }
+ }
+
/* Lookup succeeded: fill in the given host item with the first non-ignored
address found; create additional items for any others. A single A6 record
- may generate more than one address. */
+ may generate more than one address. The lookup had a chance to update the
+ fqdn; we do not want any later times round the loop to do so. */
+
+ fully_qualified_name = NULL;
for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
- rr != NULL;
+ rr;
rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
{
if (rr->type == type)
{
- /* dns_address *da = dns_address_from_rr(&dnsa, rr); */
-
- dns_address *da;
- da = dns_address_from_rr(&dnsa, rr);
+ dns_address *da = dns_address_from_rr(&dnsa, rr);
DEBUG(D_host_lookup)
- {
- if (da == NULL)
- debug_printf("no addresses extracted from A6 RR for %s\n",
+ if (!da) debug_printf("no addresses extracted from A6 RR for %s\n",
host->name);
- }
/* This loop runs only once for A and AAAA records, but may run
several times for an A6 record that generated multiple addresses. */
- for (; da != NULL; da = da->next)
+ for (; da; da = da->next)
{
#ifndef STAND_ALONE
if (ignore_target_hosts != NULL &&
}
}
-/* Control gets here only if the third lookup (the A record) succeeded.
+/* Control gets here only if the econdookup (the A record) succeeded.
However, the address may not be filled in if it was ignored. */
-return (host->address == NULL)? HOST_IGNORED : HOST_FOUND;
+return host->address ? HOST_FOUND : HOST_IGNORED;
}
srv_service when SRV used, the service name
srv_fail_domains DNS errors for these domains => assume nonexist
mx_fail_domains DNS errors for these domains => assume nonexist
+ dnssec_d.request => make dnssec request: domainlist
+ dnssec_d.require => ditto and nonexist failures
fully_qualified_name if not NULL, return fully-qualified name
removed set TRUE if local host was removed from the list
*/
int
-host_find_bydns(host_item *host, uschar *ignore_target_hosts, int whichrrs,
+host_find_bydns(host_item *host, const uschar *ignore_target_hosts, int whichrrs,
uschar *srv_service, uschar *srv_fail_domains, uschar *mx_fail_domains,
- uschar **fully_qualified_name, BOOL *removed)
+ const dnssec_domains *dnssec_d,
+ const uschar **fully_qualified_name, BOOL *removed)
{
host_item *h, *last;
dns_record *rr;
int yield;
dns_answer dnsa;
dns_scan dnss;
+BOOL dnssec_require = dnssec_d
+ && match_isinlist(host->name, CUSS &dnssec_d->require,
+ 0, NULL, 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_status_t dnssec;
/* Set the default fully qualified name to the incoming name, initialize the
resolver if necessary, set up the relevant options, and initialize the flag
if (fully_qualified_name != NULL) *fully_qualified_name = host->name;
dns_init((whichrrs & HOST_FIND_QUALIFY_SINGLE) != 0,
- (whichrrs & HOST_FIND_SEARCH_PARENTS) != 0);
+ (whichrrs & HOST_FIND_SEARCH_PARENTS) != 0,
+ dnssec_request);
host_find_failed_syntax = FALSE;
/* First, if requested, look for SRV records. The service name is given; we
-assume TCP progocol. DNS domain names are constrained to a maximum of 256
+assume TCP protocol. DNS domain names are constrained to a maximum of 256
characters, so the code below should be safe. */
if ((whichrrs & HOST_FIND_BY_SRV) != 0)
the input name, pass back the new original domain, without the prepended
magic. */
- rc = dns_lookup(&dnsa, buffer, ind_type, &temp_fully_qualified_name);
+ dnssec = DS_UNK;
+ lookup_dnssec_authenticated = NULL;
+ rc = dns_lookup_timerwrap(&dnsa, buffer, ind_type, CUSS &temp_fully_qualified_name);
+
+ DEBUG(D_dns)
+ if ((dnssec_request || dnssec_require)
+ & !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))
+ { dnssec = DS_YES; lookup_dnssec_authenticated = US"yes"; }
+ else
+ { dnssec = DS_NO; lookup_dnssec_authenticated = US"no"; }
+ }
+
if (temp_fully_qualified_name != buffer && fully_qualified_name != NULL)
*fully_qualified_name = temp_fully_qualified_name + prefix_length;
/* 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))
+ {
+ log_write(L_host_lookup_failed, LOG_MAIN,
+ "dnssec fail on SRV for %.256s", host->name);
+ rc = DNS_FAIL;
+ }
if (rc == DNS_FAIL || rc == DNS_AGAIN)
{
#ifndef STAND_ALONE
- if (match_isinlist(host->name, &srv_fail_domains, 0, NULL, NULL, MCL_DOMAIN,
- TRUE, NULL) != OK)
+ if (match_isinlist(host->name, CUSS &srv_fail_domains, 0, NULL, NULL,
+ MCL_DOMAIN, TRUE, NULL) != OK)
#endif
- return HOST_FIND_AGAIN;
+ { 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");
}
if (rc != DNS_SUCCEED && (whichrrs & HOST_FIND_BY_MX) != 0)
{
ind_type = T_MX;
- rc = dns_lookup(&dnsa, host->name, ind_type, fully_qualified_name);
- if (rc == DNS_NOMATCH) return HOST_FIND_FAILED;
- if (rc == DNS_FAIL || rc == DNS_AGAIN)
+ dnssec = DS_UNK;
+ lookup_dnssec_authenticated = NULL;
+ 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))
+ debug_printf("DNS lookup of %.256s (MX) requested AD, but got AA\n", host->name);
+
+ if (dnssec_request)
{
- #ifndef STAND_ALONE
- if (match_isinlist(host->name, &mx_fail_domains, 0, NULL, NULL, MCL_DOMAIN,
- TRUE, NULL) != OK)
- #endif
- return HOST_FIND_AGAIN;
- DEBUG(D_host_lookup) debug_printf("DNS_%s treated as DNS_NODATA "
- "(domain in mx_fail_domains)\n", (rc == DNS_FAIL)? "FAIL":"AGAIN");
+ if (dns_is_secure(&dnsa))
+ {
+ DEBUG(D_host_lookup) debug_printf("%s MX DNSSEC\n", host->name);
+ dnssec = DS_YES; lookup_dnssec_authenticated = US"yes";
+ }
+ else
+ {
+ dnssec = DS_NO; lookup_dnssec_authenticated = US"no";
+ }
+ }
+
+ switch (rc)
+ {
+ case DNS_NOMATCH:
+ yield = HOST_FIND_FAILED; goto out;
+
+ case DNS_SUCCEED:
+ if (!dnssec_require || dns_is_secure(&dnsa))
+ break;
+ log_write(L_host_lookup_failed, LOG_MAIN,
+ "dnssec fail on MX for %.256s", host->name);
+ rc = DNS_FAIL;
+ /*FALLTHROUGH*/
+
+ 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)
+ #endif
+ { yield = HOST_FIND_AGAIN; goto out; }
+ DEBUG(D_host_lookup) debug_printf("DNS_%s treated as DNS_NODATA "
+ "(domain in mx_fail_domains)\n", (rc == DNS_FAIL)? "FAIL":"AGAIN");
+ break;
}
}
if ((whichrrs & HOST_FIND_BY_A) == 0)
{
DEBUG(D_host_lookup) debug_printf("Address records are not being sought\n");
- return HOST_FIND_FAILED;
+ yield = HOST_FIND_FAILED;
+ goto out;
}
last = host; /* End of local chainlet */
host->mx = MX_NONE;
host->port = PORT_NONE;
+ host->dnssec = DS_UNK;
+ lookup_dnssec_authenticated = NULL;
rc = set_address_from_dns(host, &last, ignore_target_hosts, FALSE,
- fully_qualified_name);
+ fully_qualified_name, dnssec_request, dnssec_require);
/* If one or more address records have been found, check that none of them
are local. Since we know the host items all have their IP addresses
}
}
- return rc;
+ yield = rc;
+ goto out;
}
/* We have found one or more MX or SRV records. Sort them according to
the same precedence to sort randomly. */
if (ind_type == T_MX)
- {
weight = random_number(500);
- }
/* SRV records are specified with a port and a weight. The weight is used
in a special algorithm. However, to start with, we just use it to order the
host->sort_key = precedence * 1000 + weight;
host->status = hstatus_unknown;
host->why = hwhy_unknown;
+ host->dnssec = dnssec;
last = host;
}
next->sort_key = sort_key;
next->status = hstatus_unknown;
next->why = hwhy_unknown;
+ next->dnssec = dnssec;
next->last_try = 0;
/* Handle the case when we have to insert before the first item. */
NEXT_MX_RR: continue;
}
+if (!last) /* No rr of correct type; give up */
+ {
+ yield = HOST_FIND_FAILED;
+ goto out;
+ }
+
/* If the list of hosts was obtained from SRV records, there are two things to
do. First, if there is only one host, and it's name is ".", it means there is
no SMTP service at this domain. Otherwise, we have to sort the hosts of equal
if (host == last && host->name[0] == 0)
{
DEBUG(D_host_lookup) debug_printf("the single SRV record is \".\"\n");
- return HOST_FIND_FAILED;
+ yield = HOST_FIND_FAILED;
+ goto out;
}
DEBUG(D_host_lookup)
debug_printf(" %s P=%d W=%d\n", h->name, h->mx, h->sort_key % 1000);
}
- for (pptr = &host, h = host; h != last; pptr = &(h->next), h = h->next)
+ for (pptr = &host, h = host; h != last; pptr = &h->next, h = h->next)
{
int sum = 0;
host_item *hh;
if they happen to match something local. */
yield = HOST_FIND_FAILED; /* Default yield */
-dns_init(FALSE, FALSE); /* Disable qualify_single and search_parents */
+dns_init(FALSE, FALSE, /* Disable qualify_single and search_parents */
+ dnssec_request || dnssec_require);
for (h = host; h != last->next; h = h->next)
{
- if (h->address != NULL) continue; /* Inserted by a multihomed host */
- rc = set_address_from_dns(h, &last, ignore_target_hosts, allow_mx_to_ip, NULL);
+ if (h->address) continue; /* Inserted by a multihomed host */
+
+ rc = set_address_from_dns(h, &last, ignore_target_hosts, allow_mx_to_ip,
+ NULL, dnssec_request, dnssec_require);
if (rc != HOST_FOUND)
{
h->status = hstatus_unusable;
h->why = hwhy_deferred;
}
else
- h->why = (rc == HOST_IGNORED)? hwhy_ignored : hwhy_failed;
+ h->why = rc == HOST_IGNORED ? hwhy_ignored : hwhy_failed;
}
}
yield);
for (h = host; h != last->next; h = h->next)
{
- debug_printf(" %s %s MX=%d ", h->name,
- (h->address == NULL)? US"<null>" : h->address, h->mx);
+ debug_printf(" %s %s MX=%d %s", h->name,
+ !h->address ? US"<null>" : h->address, h->mx,
+ h->dnssec == DS_YES ? US"DNSSEC " : US"");
if (h->port != PORT_NONE) debug_printf("port=%d ", h->port);
if (h->status >= hstatus_unusable) debug_printf("*");
debug_printf("\n");
}
}
+out:
+
+dns_init(FALSE, FALSE, FALSE); /* clear the dnssec bit for getaddrbyname */
return yield;
}
-
-
-
/*************************************************
**************************************************
* Stand-alone test program *
BOOL byname = FALSE;
BOOL qualify_single = TRUE;
BOOL search_parents = FALSE;
+BOOL request_dnssec = FALSE;
+BOOL require_dnssec = FALSE;
uschar **argv = USS cargv;
uschar buffer[256];
+disable_ipv6 = FALSE;
primary_hostname = US"";
store_pool = POOL_MAIN;
debug_selector = D_host_lookup|D_interface;
/* So that debug level changes can be done first */
-dns_init(qualify_single, search_parents);
+dns_init(qualify_single, search_parents, FALSE);
printf("Testing host lookup\n");
printf("> ");
whichrrs = HOST_FIND_BY_SRV | HOST_FIND_BY_MX;
else if (Ustrcmp(buffer, "srv+mx+a") == 0)
whichrrs = HOST_FIND_BY_SRV | HOST_FIND_BY_MX | HOST_FIND_BY_A;
- else if (Ustrcmp(buffer, "qualify_single") == 0) qualify_single = TRUE;
+ else if (Ustrcmp(buffer, "qualify_single") == 0) qualify_single = TRUE;
else if (Ustrcmp(buffer, "no_qualify_single") == 0) qualify_single = FALSE;
- else if (Ustrcmp(buffer, "search_parents") == 0) search_parents = TRUE;
+ else if (Ustrcmp(buffer, "search_parents") == 0) search_parents = TRUE;
else if (Ustrcmp(buffer, "no_search_parents") == 0) search_parents = FALSE;
+ else if (Ustrcmp(buffer, "request_dnssec") == 0) request_dnssec = TRUE;
+ else if (Ustrcmp(buffer, "no_request_dnssec") == 0) request_dnssec = FALSE;
+ else if (Ustrcmp(buffer, "require_dnssec") == 0) require_dnssec = TRUE;
+ else if (Ustrcmp(buffer, "no_reqiret_dnssec") == 0) require_dnssec = FALSE;
else if (Ustrcmp(buffer, "test_harness") == 0)
running_in_test_harness = !running_in_test_harness;
+ else if (Ustrcmp(buffer, "ipv6") == 0) disable_ipv6 = !disable_ipv6;
else if (Ustrcmp(buffer, "res_debug") == 0)
{
_res.options ^= RES_DEBUG;
else
{
int flags = whichrrs;
+ dnssec_domains d;
h.name = buffer;
h.next = NULL;
if (qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
if (search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
- rc = byname?
- host_find_byname(&h, NULL, &fully_qualified_name, TRUE)
- :
- host_find_bydns(&h, NULL, flags, US"smtp", NULL, NULL,
- &fully_qualified_name, NULL);
+ d.request = request_dnssec ? &h.name : NULL;
+ d.require = require_dnssec ? &h.name : NULL;
+
+ rc = byname
+ ? host_find_byname(&h, NULL, flags, &fully_qualified_name, TRUE)
+ : host_find_bydns(&h, NULL, flags, US"smtp", NULL, NULL,
+ &d, &fully_qualified_name, NULL);
if (rc == HOST_FIND_FAILED) printf("Failed\n");
else if (rc == HOST_FIND_AGAIN) printf("Again\n");
}
#endif /* STAND_ALONE */
+/* vi: aw ai sw=2
+*/
/* End of host.c */
git://git.exim.org / users / jgh / exim.git / blobdiff