X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/0f06b4f296802e4e13188c740ea09419931a3020..ef698bf6a7a59d28c93fca18e4509ca6c67d7dca:/src/src/host.c diff --git a/src/src/host.c b/src/src/host.c index 2eef0ba70..4cdd18b89 100644 --- a/src/src/host.c +++ b/src/src/host.c @@ -2,7 +2,7 @@ * Exim - an Internet mail transport agent * *************************************************/ -/* Copyright (c) University of Cambridge 1995 - 2012 */ +/* 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 @@ -94,6 +94,53 @@ random_seed = 1103515245 * random_seed + 12345; 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; +} /************************************************* @@ -101,8 +148,7 @@ return (unsigned int)(random_seed >> 16) % limit; *************************************************/ /* 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 @@ -118,7 +164,7 @@ Returns: a hostent structure or NULL for an error */ 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); @@ -127,7 +173,7 @@ int alen = sizeof(struct in_addr); #endif int ipa; -uschar *lname = name; +const uschar *lname = name; uschar *adds; uschar **alist; struct hostent *yield; @@ -139,34 +185,6 @@ DEBUG(D_host_lookup) 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) @@ -217,7 +235,7 @@ if (ipa != 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; @@ -233,14 +251,13 @@ else } 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; @@ -250,14 +267,14 @@ else 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++) @@ -295,19 +312,18 @@ Returns: nothing */ 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; @@ -318,7 +334,7 @@ while ((name = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) } 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; @@ -444,7 +460,7 @@ Returns: a port number or PORT_NONE int host_item_get_port(host_item *h) { -uschar *p; +const uschar *p; int port, x; int len = Ustrlen(h->name); @@ -528,7 +544,7 @@ use this directly as the first item for Received: because it ain't an RFC 2822 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. */ @@ -538,7 +554,7 @@ if (sender_helo_name == NULL) show_helo = FALSE; /* If HELO/EHLO was followed by an IP literal, it's messy because of two features of IPv6. Firstly, there's the "IPv6:" prefix (Exim is liberal and doesn't require this, for historical reasons). Secondly, IPv6 addresses may not -be given in canonical form, so we have to canonicize them before comparing. As +be given in canonical form, so we have to canonicalize them before comparing. As it happens, the code works for both IPv4 and IPv6. */ else if (sender_helo_name[0] == '[' && @@ -581,12 +597,12 @@ if (sender_host_name == NULL) sender_fullhost = (sender_helo_name == NULL)? address : string_sprintf("(%s) %s", sender_helo_name, address); - sender_rcvhost = string_cat(NULL, &size, &ptr, address, adlen); + sender_rcvhost = string_catn(NULL, &size, &ptr, address, adlen); if (sender_ident != NULL || show_helo || portptr != NULL) { int firstptr; - sender_rcvhost = string_cat(sender_rcvhost, &size, &ptr, US" (", 2); + sender_rcvhost = string_catn(sender_rcvhost, &size, &ptr, US" (", 2); firstptr = ptr; if (portptr != NULL) @@ -601,7 +617,7 @@ if (sender_host_name == NULL) sender_rcvhost = string_append(sender_rcvhost, &size, &ptr, 2, (firstptr == ptr)? US"ident=" : US" ident=", sender_ident); - sender_rcvhost = string_cat(sender_rcvhost, &size, &ptr, US")", 1); + sender_rcvhost = string_catn(sender_rcvhost, &size, &ptr, US")", 1); } sender_rcvhost[ptr] = 0; /* string_cat() always leaves room */ @@ -679,8 +695,7 @@ else { 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", @@ -718,20 +733,18 @@ Returns: a chain of ip_address_items, each containing to a textual */ ip_address_item * -host_build_ifacelist(uschar *list, uschar *name) +host_build_ifacelist(const uschar *list, uschar *name) { int sep = 0; uschar *s; -uschar buffer[64]; -ip_address_item *yield = NULL; -ip_address_item *last = NULL; -ip_address_item *next; +ip_address_item * yield = NULL, * last = NULL, * next; -while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) +while ((s = string_nextinlist(&list, &sep, NULL, 0))) { int ipv; int port = host_address_extract_port(s); /* Leaves just the IP address */ - if ((ipv = string_is_ip_address(s, NULL)) == 0) + + if (!(ipv = string_is_ip_address(s, NULL))) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Malformed IP address \"%s\" in %s", s, name); @@ -749,7 +762,9 @@ while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) next->port = port; next->v6_include_v4 = FALSE; - if (yield == NULL) yield = last = next; else + if (!yield) + yield = last = next; + else { last->next = next; last = next; @@ -811,9 +826,9 @@ ip_address_item *running_interfaces = NULL; 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; @@ -972,7 +987,7 @@ Returns: the number of ints used */ int -host_aton(uschar *address, int *bin) +host_aton(const uschar *address, int *bin) { int x[4]; int v4offset = 0; @@ -984,8 +999,8 @@ supported. */ 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; @@ -1052,7 +1067,7 @@ if (Ustrchr(address, ':') != NULL) /* 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; } @@ -1083,7 +1098,7 @@ for (i = 0; i < count; i++) if (mask == 0) wordmask = 0; else if (mask < 32) { - wordmask = (-1) << (32 - mask); + wordmask = (uint)(-1) << (32 - mask); mask = 0; } else @@ -1131,20 +1146,14 @@ if (count == 1) { 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 */ @@ -1160,6 +1169,63 @@ return tt - buffer; } +/* 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 * @@ -1179,7 +1245,7 @@ host_is_tls_on_connect_port(int port) { int sep = 0; uschar buffer[32]; -uschar *list = tls_in.on_connect_ports; +const uschar *list = tls_in.on_connect_ports; uschar *s; uschar *end; @@ -1214,7 +1280,7 @@ Returns: */ 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]; @@ -1255,7 +1321,7 @@ for (i = 0; i < size; i++) if (mlen == 0) mask = 0; else if (mlen < 32) { - mask = (-1) << (32 - mlen); + mask = (uint)(-1) << (32 - mlen); mlen = 0; } else @@ -1329,9 +1395,9 @@ for (h = host; h != last->next; h = h->next) 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; @@ -1455,6 +1521,9 @@ int len; 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 */ @@ -1490,6 +1559,11 @@ addr.s_addr = (S_ADDR_TYPE)inet_addr(CS sender_host_address); 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) @@ -1572,7 +1646,7 @@ Returns: OK on success, the answer being placed in the global variable FAIL if no host name can be found DEFER if a temporary error was encountered -The variable host_lookup_msg is set to an empty string on sucess, or to a +The variable host_lookup_msg is set to an empty string on success, or to a reason for the failure otherwise, in a form suitable for tagging onto an error message, and also host_lookup_failed is set TRUE if the lookup failed. If there was a defer, host_lookup_deferred is set TRUE. @@ -1590,7 +1664,7 @@ uschar *hname, *save_hostname; 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; @@ -1615,14 +1689,13 @@ if (running_in_test_harness && /* 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, 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 @@ -1637,8 +1710,6 @@ while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) int count = 0; int old_pool = store_pool; - /* Ideally we'd check DNSSEC both forward and reverse, but we use the - gethost* routines for forward, so can't do that unless/until we rewrite. */ sender_host_dnssec = dns_is_secure(&dnsa); DEBUG(D_dns) debug_printf("Reverse DNS security status: %s\n", @@ -1647,11 +1718,10 @@ while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) 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. */ @@ -1661,7 +1731,7 @@ while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) /* 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; @@ -1686,8 +1756,8 @@ while ((ordername = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) "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++; } } @@ -1742,8 +1812,8 @@ if (sender_host_name == NULL) 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 @@ -1761,26 +1831,35 @@ the names, and accepts only those that have the correct IP address. */ save_hostname = sender_host_name; /* Save for error messages */ aliases = sender_host_aliases; -for (hname = sender_host_name; hname != NULL; hname = *aliases++) +for (hname = sender_host_name; hname; hname = *aliases++) { 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 last 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, 0, 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); - for (hh = &h; hh != NULL; hh = hh->next) - { + + /* 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; 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); @@ -1788,10 +1867,8 @@ for (hname = sender_host_name; hname != NULL; hname = *aliases++) 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); @@ -1804,9 +1881,7 @@ for (hname = sender_host_name; hname != NULL; hname = *aliases++) 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. */ @@ -1892,8 +1967,8 @@ Returns: HOST_FIND_FAILED Failed to find the host or domain */ int -host_find_byname(host_item *host, uschar *ignore_target_hosts, int flags, - 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; @@ -1903,22 +1978,12 @@ BOOL temp_error = FALSE; int af; #endif -/* If we are in the test harness, a name ending in .test.again.dns always -forces a temporary error response, unless the name is in -dns_again_means_nonexist. */ - -if (running_in_test_harness) - { - uschar *endname = host->name + Ustrlen(host->name); - if (Ustrcmp(endname - 14, "test.again.dns") == 0) goto RETURN_AGAIN; - } - /* 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. */ dns_init((flags & HOST_FIND_QUALIFY_SINGLE) != 0, (flags & HOST_FIND_SEARCH_PARENTS) != 0, - FALSE); /*XXX dnssec? */ + 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 @@ -1932,8 +1997,8 @@ lookups here (except when testing standalone). */ #else 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)) #endif { af = AF_INET; times = 1; } @@ -1962,11 +2027,14 @@ for (i = 1; i <= times; BOOL ipv4_addr; 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) hostdata = host_fake_gethostbyname(host->name, af, &error_num); @@ -1990,17 +2058,21 @@ for (i = 1; i <= times; } #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; } @@ -2116,7 +2188,7 @@ yield = local_host_check? 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", @@ -2146,9 +2218,9 @@ RETURN_AGAIN: { #ifndef STAND_ALONE int rc; - uschar *save = deliver_domain; + const uschar *save = deliver_domain; deliver_domain = host->name; /* set $domain */ - rc = match_isinlist(host->name, &dns_again_means_nonexist, 0, NULL, NULL, + rc = match_isinlist(host->name, CUSS &dns_again_means_nonexist, 0, NULL, NULL, MCL_DOMAIN, TRUE, NULL); deliver_domain = save; if (rc == OK) @@ -2196,22 +2268,26 @@ Arguments: fully_qualified_name if not NULL, return fully qualified name here if the contents are different (i.e. it must be preset to something) - dnnssec_require if TRUE check the DNS result AD bit + 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 + HOST_FIND_SECURITY dnssec required but not acheived HOST_FOUND found AAAA and/or A record(s) HOST_IGNORED found, but all IPs ignored */ 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 */ BOOL v6_find_again = FALSE; +BOOL dnssec_fail = FALSE; int i; /* If allow_ip is set, a name which is an IP address returns that value @@ -2231,27 +2307,22 @@ if (allow_ip && string_is_ip_address(host->name, NULL) != 0) 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 */ @@ -2261,17 +2332,24 @@ loop once only, looking only for A records. */ 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"; - /* We want to return HOST_FIND_AGAIN if one of the A, A6, or AAAA lookups + 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 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.) */ @@ -2280,13 +2358,13 @@ for (; i >= 0; i--) { 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; @@ -2305,9 +2383,9 @@ for (; i >= 0; i--) { if (dnssec_require) { - log_write(L_host_lookup_failed, LOG_MAIN, - "dnssec fail on %s for %.256s", - i>1 ? "A6" : i>0 ? "AAAA" : "A", host->name); + dnssec_fail = TRUE; + DEBUG(D_host_lookup) debug_printf("dnssec fail on %s for %.256s", + i>0 ? "AAAA" : "A", host->name); continue; } if (host->dnssec == DS_YES) /* set in host_find_bydns() */ @@ -2321,30 +2399,27 @@ for (; i >= 0; i--) /* 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 && @@ -2431,10 +2506,14 @@ for (; i >= 0; i--) } } -/* Control gets here only if the third lookup (the A record) succeeded. +/* 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 == NULL)? HOST_IGNORED : HOST_FOUND; +return host->address + ? HOST_FOUND + : dnssec_fail + ? HOST_FIND_SECURITY + : HOST_IGNORED; } @@ -2464,8 +2543,8 @@ Arguments: 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_request_domains => make dnssec request - dnssec_require_domains => ditto and nonexist failures + 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 @@ -2473,6 +2552,7 @@ Returns: HOST_FIND_FAILED Failed to find the host or domain; if there was a syntax error, host_find_failed_syntax is set. HOST_FIND_AGAIN Could not resolve at this time + HOST_FIND_SECURITY dnsssec required but not acheived HOST_FOUND Host found HOST_FOUND_LOCAL The lowest MX record points to this machine, if MX records were found, or @@ -2481,10 +2561,10 @@ Returns: HOST_FIND_FAILED Failed to find the host or domain; */ 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 *dnssec_request_domains, uschar *dnssec_require_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; @@ -2493,11 +2573,13 @@ int ind_type = 0; int yield; dns_answer dnsa; dns_scan dnss; -BOOL dnssec_require = match_isinlist(host->name, &dnssec_require_domains, +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 - || match_isinlist(host->name, &dnssec_request_domains, - 0, NULL, NULL, MCL_DOMAIN, TRUE, NULL) == OK; + || ( 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 @@ -2507,12 +2589,11 @@ that gets set for DNS syntax check errors. */ if (fully_qualified_name != NULL) *fully_qualified_name = host->name; dns_init((whichrrs & HOST_FIND_QUALIFY_SINGLE) != 0, (whichrrs & HOST_FIND_SEARCH_PARENTS) != 0, - dnssec_request - ); + 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) @@ -2531,7 +2612,13 @@ if ((whichrrs & HOST_FIND_BY_SRV) != 0) dnssec = DS_UNK; lookup_dnssec_authenticated = NULL; - rc = dns_lookup(&dnsa, buffer, ind_type, &temp_fully_qualified_name); + 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) { @@ -2556,8 +2643,8 @@ if ((whichrrs & HOST_FIND_BY_SRV) != 0) 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 { yield = HOST_FIND_AGAIN; goto out; } DEBUG(D_host_lookup) debug_printf("DNS_%s treated as DNS_NODATA " @@ -2572,17 +2659,22 @@ same domain. The result will be DNS_NODATA if the domain exists but has no MX records. On DNS failures, we give the "try again" error unless the domain is listed as one for which we continue. */ -if (rc != DNS_SUCCEED && (whichrrs & HOST_FIND_BY_MX) != 0) +if (rc != DNS_SUCCEED && whichrrs & HOST_FIND_BY_MX) { ind_type = T_MX; dnssec = DS_UNK; lookup_dnssec_authenticated = NULL; - rc = dns_lookup(&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)) + debug_printf("DNS lookup of %.256s (MX) requested AD, but got AA\n", host->name); if (dnssec_request) - { 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"; } @@ -2590,7 +2682,6 @@ if (rc != DNS_SUCCEED && (whichrrs & HOST_FIND_BY_MX) != 0) { dnssec = DS_NO; lookup_dnssec_authenticated = US"no"; } - } switch (rc) { @@ -2600,17 +2691,22 @@ if (rc != DNS_SUCCEED && (whichrrs & HOST_FIND_BY_MX) != 0) 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); + 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) + { yield = HOST_FIND_SECURITY; goto out; } +#endif rc = DNS_FAIL; /*FALLTHROUGH*/ case DNS_FAIL: case DNS_AGAIN: - #ifndef STAND_ALONE - if (match_isinlist(host->name, &mx_fail_domains, 0, NULL, NULL, MCL_DOMAIN, - TRUE, NULL) != OK) - #endif +#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"); @@ -2691,17 +2787,15 @@ host which is not the primary hostname. */ last = NULL; /* Indicates that not even the first item is filled yet */ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); - rr != NULL; - rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) + rr; + rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == ind_type) { int precedence; int weight = 0; /* For SRV records */ int port = PORT_NONE; - uschar *s; /* MUST be unsigned for GETSHORT */ + const uschar * s = rr->data; /* MUST be unsigned for GETSHORT */ uschar data[256]; - if (rr->type != ind_type) continue; - s = rr->data; GETSHORT(precedence, s); /* Pointer s is advanced */ /* For MX records, we use a random "weight" which causes multiple records of @@ -2834,6 +2928,12 @@ for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); 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 @@ -2860,7 +2960,7 @@ if (ind_type == T_SRV) 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; @@ -2965,19 +3065,24 @@ dns_init(FALSE, FALSE, /* Disable qualify_single and search_parents */ for (h = host; h != last->next; h = h->next) { - if (h->address != NULL) continue; /* Inserted by a multihomed host */ + 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; - if (rc == HOST_FIND_AGAIN) + switch (rc) { - yield = rc; - h->why = hwhy_deferred; + case HOST_FIND_AGAIN: + yield = rc; h->why = hwhy_deferred; break; + case HOST_FIND_SECURITY: + yield = rc; h->why = hwhy_insecure; break; + case HOST_IGNORED: + h->why = hwhy_ignored; break; + default: + h->why = hwhy_failed; break; } - else - h->why = (rc == HOST_IGNORED)? hwhy_ignored : hwhy_failed; } } @@ -2986,7 +3091,7 @@ been explicitly ignored, and remove them from the list, as if they did not exist. If we end up with just a single, ignored host, flatten its fields as if nothing was found. */ -if (ignore_target_hosts != NULL) +if (ignore_target_hosts) { host_item *prev = NULL; for (h = host; h != last->next; h = h->next) @@ -3022,24 +3127,22 @@ single MX preference value, IPv6 addresses come first. This can separate the addresses of a multihomed host, but that should not matter. */ #if HAVE_IPV6 -if (h != last && !disable_ipv6) +if (h != last && !disable_ipv6) for (h = host; h != last; h = h->next) { - for (h = host; h != last; h = h->next) - { - host_item temp; - host_item *next = h->next; - if (h->mx != next->mx || /* If next is different MX */ - h->address == NULL || /* OR this one is unset */ - Ustrchr(h->address, ':') != NULL || /* OR this one is IPv6 */ - (next->address != NULL && - Ustrchr(next->address, ':') == NULL)) /* OR next is IPv4 */ - continue; /* move on to next */ - temp = *h; /* otherwise, swap */ - temp.next = next->next; - *h = *next; - h->next = next; - *next = temp; - } + host_item temp; + host_item *next = h->next; + + if (h->mx != next->mx || /* If next is different MX */ + h->address == NULL || /* OR this one is unset */ + Ustrchr(h->address, ':') != NULL || /* OR this one is IPv6 */ + (next->address != NULL && + Ustrchr(next->address, ':') == NULL)) /* OR next is IPv4 */ + continue; /* move on to next */ + temp = *h; /* otherwise, swap */ + temp.next = next->next; + *h = *next; + h->next = next; + *next = temp; } #endif @@ -3063,13 +3166,15 @@ DEBUG(D_host_lookup) debug_printf("host_find_bydns yield = %s (%d); returned hosts:\n", (yield == HOST_FOUND)? "HOST_FOUND" : (yield == HOST_FOUND_LOCAL)? "HOST_FOUND_LOCAL" : + (yield == HOST_FIND_SECURITY)? "HOST_FIND_SECURITY" : (yield == HOST_FIND_AGAIN)? "HOST_FIND_AGAIN" : (yield == HOST_FIND_FAILED)? "HOST_FIND_FAILED" : "?", yield); for (h = host; h != last->next; h = h->next) { - debug_printf(" %s %s MX=%d ", h->name, - (h->address == NULL)? US"" : h->address, h->mx); + debug_printf(" %s %s MX=%d %s", h->name, + !h->address ? US"" : 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"); @@ -3082,9 +3187,6 @@ dns_init(FALSE, FALSE, FALSE); /* clear the dnssec bit for getaddrbyname */ return yield; } - - - /************************************************* ************************************************** * Stand-alone test program * @@ -3154,7 +3256,7 @@ while (Ufgets(buffer, 256, stdin) != NULL) 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, "no_require_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; @@ -3175,6 +3277,7 @@ while (Ufgets(buffer, 256, stdin) != NULL) else { int flags = whichrrs; + dnssec_domains d; h.name = buffer; h.next = NULL; @@ -3187,16 +3290,21 @@ while (Ufgets(buffer, 256, stdin) != NULL) if (qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; if (search_parents) flags |= HOST_FIND_SEARCH_PARENTS; + 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, - request_dnssec ? &h.name : NULL, - require_dnssec ? &h.name : NULL, - &fully_qualified_name, NULL); + &d, &fully_qualified_name, NULL); - if (rc == HOST_FIND_FAILED) printf("Failed\n"); - else if (rc == HOST_FIND_AGAIN) printf("Again\n"); - else if (rc == HOST_FOUND_LOCAL) printf("Local\n"); + switch (rc) + { + case HOST_FIND_FAILED: printf("Failed\n"); break; + case HOST_FIND_AGAIN: printf("Again\n"); break; + case HOST_FIND_SECURITY: printf("Security\n"); break; + case HOST_FOUND_LOCAL: printf("Local\n"); break; + } } printf("\n> ");