2 * util/net_help.c - implementation of the network helper code
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 * Implementation of net_help.h.
41 #include "util/net_help.h"
43 #include "util/data/dname.h"
44 #include "util/module.h"
45 #include "util/regional.h"
46 #include "ldns/parseutil.h"
47 #include "ldns/wire2str.h"
49 #ifdef HAVE_OPENSSL_SSL_H
50 #include <openssl/ssl.h>
52 #ifdef HAVE_OPENSSL_ERR_H
53 #include <openssl/err.h>
56 /** max length of an IP address (the address portion) that we allow */
57 #define MAX_ADDR_STRLEN 128 /* characters */
58 /** default value for EDNS ADVERTISED size */
59 uint16_t EDNS_ADVERTISED_SIZE = 4096;
61 /** minimal responses when positive answer: default is no */
62 int MINIMAL_RESPONSES = 0;
64 /** rrset order roundrobin: default is no */
65 int RRSET_ROUNDROBIN = 0;
67 /* returns true is string addr is an ip6 specced address */
69 str_is_ip6(const char* str)
77 fd_set_nonblock(int s)
81 if((flag = fcntl(s, F_GETFL)) == -1) {
82 log_err("can't fcntl F_GETFL: %s", strerror(errno));
86 if(fcntl(s, F_SETFL, flag) == -1) {
87 log_err("can't fcntl F_SETFL: %s", strerror(errno));
90 #elif defined(HAVE_IOCTLSOCKET)
92 if(ioctlsocket(s, FIONBIO, &on) != 0) {
93 log_err("can't ioctlsocket FIONBIO on: %s",
94 wsa_strerror(WSAGetLastError()));
105 if((flag = fcntl(s, F_GETFL)) == -1) {
106 log_err("cannot fcntl F_GETFL: %s", strerror(errno));
110 if(fcntl(s, F_SETFL, flag) == -1) {
111 log_err("cannot fcntl F_SETFL: %s", strerror(errno));
114 #elif defined(HAVE_IOCTLSOCKET)
115 unsigned long off = 0;
116 if(ioctlsocket(s, FIONBIO, &off) != 0) {
117 log_err("can't ioctlsocket FIONBIO off: %s",
118 wsa_strerror(WSAGetLastError()));
127 if(num == 0) return 1;
128 return (num & (num-1)) == 0;
132 memdup(void* data, size_t len)
135 if(!data) return NULL;
136 if(len == 0) return NULL;
139 memcpy(d, data, len);
144 log_addr(enum verbosity_value v, const char* str,
145 struct sockaddr_storage* addr, socklen_t addrlen)
148 const char* family = "unknown";
150 int af = (int)((struct sockaddr_in*)addr)->sin_family;
151 void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
155 case AF_INET: family="ip4"; break;
156 case AF_INET6: family="ip6";
157 sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
159 case AF_UNIX: family="unix"; break;
162 if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
163 (void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
165 dest[sizeof(dest)-1] = 0;
166 port = ntohs(((struct sockaddr_in*)addr)->sin_port);
168 verbose(v, "%s %s %s port %d (len %d)", str, family, dest,
169 (int)port, (int)addrlen);
170 else verbose(v, "%s %s port %d", str, dest, (int)port);
174 extstrtoaddr(const char* str, struct sockaddr_storage* addr,
178 int port = UNBOUND_DNS_PORT;
179 if((s=strchr(str, '@'))) {
180 char buf[MAX_ADDR_STRLEN];
181 if(s-str >= MAX_ADDR_STRLEN) {
184 (void)strlcpy(buf, str, sizeof(buf));
187 if(port == 0 && strcmp(s+1,"0")!=0) {
190 return ipstrtoaddr(buf, port, addr, addrlen);
192 return ipstrtoaddr(str, port, addr, addrlen);
197 ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
204 char buf[MAX_ADDR_STRLEN];
206 struct sockaddr_in6* sa = (struct sockaddr_in6*)addr;
207 *addrlen = (socklen_t)sizeof(struct sockaddr_in6);
208 memset(sa, 0, *addrlen);
209 sa->sin6_family = AF_INET6;
210 sa->sin6_port = (in_port_t)htons(p);
211 if((s=strchr(ip, '%'))) { /* ip6%interface, rfc 4007 */
212 if(s-ip >= MAX_ADDR_STRLEN)
214 (void)strlcpy(buf, ip, sizeof(buf));
216 sa->sin6_scope_id = (uint32_t)atoi(s+1);
219 if(inet_pton((int)sa->sin6_family, ip, &sa->sin6_addr) <= 0) {
223 struct sockaddr_in* sa = (struct sockaddr_in*)addr;
224 *addrlen = (socklen_t)sizeof(struct sockaddr_in);
225 memset(sa, 0, *addrlen);
226 sa->sin_family = AF_INET;
227 sa->sin_port = (in_port_t)htons(p);
228 if(inet_pton((int)sa->sin_family, ip, &sa->sin_addr) <= 0) {
235 int netblockstrtoaddr(const char* str, int port, struct sockaddr_storage* addr,
236 socklen_t* addrlen, int* net)
239 *net = (str_is_ip6(str)?128:32);
240 if((s=strchr(str, '/'))) {
241 if(atoi(s+1) > *net) {
242 log_err("netblock too large: %s", str);
246 if(*net == 0 && strcmp(s+1, "0") != 0) {
247 log_err("cannot parse netblock: '%s'", str);
250 if(!(s = strdup(str))) {
251 log_err("out of memory");
254 *strchr(s, '/') = '\0';
256 if(!ipstrtoaddr(s?s:str, port, addr, addrlen)) {
258 log_err("cannot parse ip address: '%s'", str);
263 addr_mask(addr, *addrlen, *net);
269 log_nametypeclass(enum verbosity_value v, const char* str, uint8_t* name,
270 uint16_t type, uint16_t dclass)
272 char buf[LDNS_MAX_DOMAINLEN+1];
277 dname_str(name, buf);
278 if(type == LDNS_RR_TYPE_TSIG) ts = "TSIG";
279 else if(type == LDNS_RR_TYPE_IXFR) ts = "IXFR";
280 else if(type == LDNS_RR_TYPE_AXFR) ts = "AXFR";
281 else if(type == LDNS_RR_TYPE_MAILB) ts = "MAILB";
282 else if(type == LDNS_RR_TYPE_MAILA) ts = "MAILA";
283 else if(type == LDNS_RR_TYPE_ANY) ts = "ANY";
284 else if(sldns_rr_descript(type) && sldns_rr_descript(type)->_name)
285 ts = sldns_rr_descript(type)->_name;
287 snprintf(t, sizeof(t), "TYPE%d", (int)type);
290 if(sldns_lookup_by_id(sldns_rr_classes, (int)dclass) &&
291 sldns_lookup_by_id(sldns_rr_classes, (int)dclass)->name)
292 cs = sldns_lookup_by_id(sldns_rr_classes, (int)dclass)->name;
294 snprintf(c, sizeof(c), "CLASS%d", (int)dclass);
297 log_info("%s %s %s %s", str, buf, ts, cs);
300 void log_name_addr(enum verbosity_value v, const char* str, uint8_t* zone,
301 struct sockaddr_storage* addr, socklen_t addrlen)
304 const char* family = "unknown_family ";
305 char namebuf[LDNS_MAX_DOMAINLEN+1];
307 int af = (int)((struct sockaddr_in*)addr)->sin_family;
308 void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
312 case AF_INET: family=""; break;
313 case AF_INET6: family="";
314 sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
316 case AF_UNIX: family="unix_family "; break;
319 if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
320 (void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
322 dest[sizeof(dest)-1] = 0;
323 port = ntohs(((struct sockaddr_in*)addr)->sin_port);
324 dname_str(zone, namebuf);
325 if(af != AF_INET && af != AF_INET6)
326 verbose(v, "%s <%s> %s%s#%d (addrlen %d)",
327 str, namebuf, family, dest, (int)port, (int)addrlen);
328 else verbose(v, "%s <%s> %s%s#%d",
329 str, namebuf, family, dest, (int)port);
333 sockaddr_cmp(struct sockaddr_storage* addr1, socklen_t len1,
334 struct sockaddr_storage* addr2, socklen_t len2)
336 struct sockaddr_in* p1_in = (struct sockaddr_in*)addr1;
337 struct sockaddr_in* p2_in = (struct sockaddr_in*)addr2;
338 struct sockaddr_in6* p1_in6 = (struct sockaddr_in6*)addr1;
339 struct sockaddr_in6* p2_in6 = (struct sockaddr_in6*)addr2;
344 log_assert(len1 == len2);
345 if( p1_in->sin_family < p2_in->sin_family)
347 if( p1_in->sin_family > p2_in->sin_family)
349 log_assert( p1_in->sin_family == p2_in->sin_family );
351 if( p1_in->sin_family == AF_INET ) {
352 /* just order it, ntohs not required */
353 if(p1_in->sin_port < p2_in->sin_port)
355 if(p1_in->sin_port > p2_in->sin_port)
357 log_assert(p1_in->sin_port == p2_in->sin_port);
358 return memcmp(&p1_in->sin_addr, &p2_in->sin_addr, INET_SIZE);
359 } else if (p1_in6->sin6_family == AF_INET6) {
360 /* just order it, ntohs not required */
361 if(p1_in6->sin6_port < p2_in6->sin6_port)
363 if(p1_in6->sin6_port > p2_in6->sin6_port)
365 log_assert(p1_in6->sin6_port == p2_in6->sin6_port);
366 return memcmp(&p1_in6->sin6_addr, &p2_in6->sin6_addr,
369 /* eek unknown type, perform this comparison for sanity. */
370 return memcmp(addr1, addr2, len1);
375 sockaddr_cmp_addr(struct sockaddr_storage* addr1, socklen_t len1,
376 struct sockaddr_storage* addr2, socklen_t len2)
378 struct sockaddr_in* p1_in = (struct sockaddr_in*)addr1;
379 struct sockaddr_in* p2_in = (struct sockaddr_in*)addr2;
380 struct sockaddr_in6* p1_in6 = (struct sockaddr_in6*)addr1;
381 struct sockaddr_in6* p2_in6 = (struct sockaddr_in6*)addr2;
386 log_assert(len1 == len2);
387 if( p1_in->sin_family < p2_in->sin_family)
389 if( p1_in->sin_family > p2_in->sin_family)
391 log_assert( p1_in->sin_family == p2_in->sin_family );
393 if( p1_in->sin_family == AF_INET ) {
394 return memcmp(&p1_in->sin_addr, &p2_in->sin_addr, INET_SIZE);
395 } else if (p1_in6->sin6_family == AF_INET6) {
396 return memcmp(&p1_in6->sin6_addr, &p2_in6->sin6_addr,
399 /* eek unknown type, perform this comparison for sanity. */
400 return memcmp(addr1, addr2, len1);
405 addr_is_ip6(struct sockaddr_storage* addr, socklen_t len)
407 if(len == (socklen_t)sizeof(struct sockaddr_in6) &&
408 ((struct sockaddr_in6*)addr)->sin6_family == AF_INET6)
414 addr_mask(struct sockaddr_storage* addr, socklen_t len, int net)
416 uint8_t mask[8] = {0x0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe};
419 if(addr_is_ip6(addr, len)) {
420 s = (uint8_t*)&((struct sockaddr_in6*)addr)->sin6_addr;
423 s = (uint8_t*)&((struct sockaddr_in*)addr)->sin_addr;
428 for(i=net/8+1; i<max/8; i++) {
431 s[net/8] &= mask[net&0x7];
435 addr_in_common(struct sockaddr_storage* addr1, int net1,
436 struct sockaddr_storage* addr2, int net2, socklen_t addrlen)
438 int min = (net1<net2)?net1:net2;
442 if(addr_is_ip6(addr1, addrlen)) {
443 s1 = (uint8_t*)&((struct sockaddr_in6*)addr1)->sin6_addr;
444 s2 = (uint8_t*)&((struct sockaddr_in6*)addr2)->sin6_addr;
447 s1 = (uint8_t*)&((struct sockaddr_in*)addr1)->sin_addr;
448 s2 = (uint8_t*)&((struct sockaddr_in*)addr2)->sin_addr;
451 /* match = bits_in_common(s1, s2, to); */
452 for(i=0; i<to; i++) {
456 uint8_t z = s1[i]^s2[i];
465 if(match > min) match = min;
470 addr_to_str(struct sockaddr_storage* addr, socklen_t addrlen,
471 char* buf, size_t len)
473 int af = (int)((struct sockaddr_in*)addr)->sin_family;
474 void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
475 if(addr_is_ip6(addr, addrlen))
476 sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
477 if(inet_ntop(af, sinaddr, buf, (socklen_t)len) == 0) {
478 snprintf(buf, len, "(inet_ntop_error)");
483 addr_is_ip4mapped(struct sockaddr_storage* addr, socklen_t addrlen)
485 /* prefix for ipv4 into ipv6 mapping is ::ffff:x.x.x.x */
486 const uint8_t map_prefix[16] =
487 {0,0,0,0, 0,0,0,0, 0,0,0xff,0xff, 0,0,0,0};
489 if(!addr_is_ip6(addr, addrlen))
491 /* s is 16 octet ipv6 address string */
492 s = (uint8_t*)&((struct sockaddr_in6*)addr)->sin6_addr;
493 return (memcmp(s, map_prefix, 12) == 0);
496 int addr_is_broadcast(struct sockaddr_storage* addr, socklen_t addrlen)
498 int af = (int)((struct sockaddr_in*)addr)->sin_family;
499 void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
500 return af == AF_INET && addrlen>=(socklen_t)sizeof(struct sockaddr_in)
501 && memcmp(sinaddr, "\377\377\377\377", 4) == 0;
504 int addr_is_any(struct sockaddr_storage* addr, socklen_t addrlen)
506 int af = (int)((struct sockaddr_in*)addr)->sin_family;
507 void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
508 void* sin6addr = &((struct sockaddr_in6*)addr)->sin6_addr;
509 if(af == AF_INET && addrlen>=(socklen_t)sizeof(struct sockaddr_in)
510 && memcmp(sinaddr, "\000\000\000\000", 4) == 0)
512 else if(af==AF_INET6 && addrlen>=(socklen_t)sizeof(struct sockaddr_in6)
513 && memcmp(sin6addr, "\000\000\000\000\000\000\000\000"
514 "\000\000\000\000\000\000\000\000", 16) == 0)
519 void sock_list_insert(struct sock_list** list, struct sockaddr_storage* addr,
520 socklen_t len, struct regional* region)
522 struct sock_list* add = (struct sock_list*)regional_alloc(region,
523 sizeof(*add) - sizeof(add->addr) + (size_t)len);
525 log_err("out of memory in socketlist insert");
532 if(len) memmove(&add->addr, addr, len);
535 void sock_list_prepend(struct sock_list** list, struct sock_list* add)
537 struct sock_list* last = add;
546 int sock_list_find(struct sock_list* list, struct sockaddr_storage* addr,
550 if(len == list->len) {
551 if(len == 0 || sockaddr_cmp_addr(addr, len,
552 &list->addr, list->len) == 0)
560 void sock_list_merge(struct sock_list** list, struct regional* region,
561 struct sock_list* add)
564 for(p=add; p; p=p->next) {
565 if(!sock_list_find(*list, &p->addr, p->len))
566 sock_list_insert(list, &p->addr, p->len, region);
571 log_crypto_err(const char* str)
574 /* error:[error code]:[library name]:[function name]:[reason string] */
577 ERR_error_string_n(ERR_get_error(), buf, sizeof(buf));
578 log_err("%s crypto %s", str, buf);
579 while( (e=ERR_get_error()) ) {
580 ERR_error_string_n(e, buf, sizeof(buf));
581 log_err("and additionally crypto %s", buf);
585 #endif /* HAVE_SSL */
588 void* listen_sslctx_create(char* key, char* pem, char* verifypem)
591 SSL_CTX* ctx = SSL_CTX_new(SSLv23_server_method());
593 log_crypto_err("could not SSL_CTX_new");
596 /* no SSLv2 because has defects */
597 if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)){
598 log_crypto_err("could not set SSL_OP_NO_SSLv2");
602 if(!SSL_CTX_use_certificate_file(ctx, pem, SSL_FILETYPE_PEM)) {
603 log_err("error for cert file: %s", pem);
604 log_crypto_err("error in SSL_CTX use_certificate_file");
608 if(!SSL_CTX_use_PrivateKey_file(ctx, key, SSL_FILETYPE_PEM)) {
609 log_err("error for private key file: %s", key);
610 log_crypto_err("Error in SSL_CTX use_PrivateKey_file");
614 if(!SSL_CTX_check_private_key(ctx)) {
615 log_err("error for key file: %s", key);
616 log_crypto_err("Error in SSL_CTX check_private_key");
621 if(verifypem && verifypem[0]) {
622 if(!SSL_CTX_load_verify_locations(ctx, verifypem, NULL)) {
623 log_crypto_err("Error in SSL_CTX verify locations");
627 SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(
629 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
633 (void)key; (void)pem; (void)verifypem;
638 void* connect_sslctx_create(char* key, char* pem, char* verifypem)
641 SSL_CTX* ctx = SSL_CTX_new(SSLv23_client_method());
643 log_crypto_err("could not allocate SSL_CTX pointer");
646 if(!(SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)) {
647 log_crypto_err("could not set SSL_OP_NO_SSLv2");
652 if(!SSL_CTX_use_certificate_file(ctx, pem, SSL_FILETYPE_PEM)) {
653 log_err("error in client certificate %s", pem);
654 log_crypto_err("error in certificate file");
658 if(!SSL_CTX_use_PrivateKey_file(ctx, key, SSL_FILETYPE_PEM)) {
659 log_err("error in client private key %s", key);
660 log_crypto_err("error in key file");
664 if(!SSL_CTX_check_private_key(ctx)) {
665 log_err("error in client key %s", key);
666 log_crypto_err("error in SSL_CTX_check_private_key");
671 if(verifypem && verifypem[0]) {
672 if(!SSL_CTX_load_verify_locations(ctx, verifypem, NULL) != 1) {
673 log_crypto_err("error in SSL_CTX verify");
677 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
681 (void)key; (void)pem; (void)verifypem;
686 void* incoming_ssl_fd(void* sslctx, int fd)
689 SSL* ssl = SSL_new((SSL_CTX*)sslctx);
691 log_crypto_err("could not SSL_new");
694 SSL_set_accept_state(ssl);
695 (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
696 if(!SSL_set_fd(ssl, fd)) {
697 log_crypto_err("could not SSL_set_fd");
703 (void)sslctx; (void)fd;
708 void* outgoing_ssl_fd(void* sslctx, int fd)
711 SSL* ssl = SSL_new((SSL_CTX*)sslctx);
713 log_crypto_err("could not SSL_new");
716 SSL_set_connect_state(ssl);
717 (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
718 if(!SSL_set_fd(ssl, fd)) {
719 log_crypto_err("could not SSL_set_fd");
725 (void)sslctx; (void)fd;
730 #if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
731 /** global lock list for openssl locks */
732 static lock_basic_t *ub_openssl_locks = NULL;
734 /** callback that gets thread id for openssl */
736 ub_crypto_id_cb(void)
738 return (unsigned long)ub_thread_self();
742 ub_crypto_lock_cb(int mode, int type, const char *ATTR_UNUSED(file),
743 int ATTR_UNUSED(line))
745 if((mode&CRYPTO_LOCK)) {
746 lock_basic_lock(&ub_openssl_locks[type]);
748 lock_basic_unlock(&ub_openssl_locks[type]);
751 #endif /* OPENSSL_THREADS */
753 int ub_openssl_lock_init(void)
755 #if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
757 ub_openssl_locks = (lock_basic_t*)malloc(
758 sizeof(lock_basic_t)*CRYPTO_num_locks());
759 if(!ub_openssl_locks)
761 for(i=0; i<CRYPTO_num_locks(); i++) {
762 lock_basic_init(&ub_openssl_locks[i]);
764 CRYPTO_set_id_callback(&ub_crypto_id_cb);
765 CRYPTO_set_locking_callback(&ub_crypto_lock_cb);
766 #endif /* OPENSSL_THREADS */
770 void ub_openssl_lock_delete(void)
772 #if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
774 if(!ub_openssl_locks)
776 CRYPTO_set_id_callback(NULL);
777 CRYPTO_set_locking_callback(NULL);
778 for(i=0; i<CRYPTO_num_locks(); i++) {
779 lock_basic_destroy(&ub_openssl_locks[i]);
781 free(ub_openssl_locks);
782 #endif /* OPENSSL_THREADS */