unbound/util/net_help.c

   1 /*
   2  * util/net_help.c - implementation of the network helper code
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  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.
  18  *
  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.
  22  *
  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.
  34  */
  35 /**
  36  * \file
  37  * Implementation of net_help.h.
  38  */
  39
  40 #include "config.h"
  41 #include "util/net_help.h"
  42 #include "util/log.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"
  48 #include <fcntl.h>
  49 #ifdef HAVE_OPENSSL_SSL_H
  50 #include <openssl/ssl.h>
  51 #endif
  52 #ifdef HAVE_OPENSSL_ERR_H
  53 #include <openssl/err.h>
  54 #endif
  55
  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;
  60
  61 /** minimal responses when positive answer: default is no */
  62 int MINIMAL_RESPONSES = 0;
  63
  64 /** rrset order roundrobin: default is no */
  65 int RRSET_ROUNDROBIN = 0;
  66
  67 /* returns true is string addr is an ip6 specced address */
  68 int
  69 str_is_ip6(const char* str)
  70 {
  71         if(strchr(str, ':'))
  72                 return 1;
  73         else    return 0;
  74 }
  75
  76 int
  77 fd_set_nonblock(int s)
  78 {
  79 #ifdef HAVE_FCNTL
  80         int flag;
  81         if((flag = fcntl(s, F_GETFL)) == -1) {
  82                 log_err("can't fcntl F_GETFL: %s", strerror(errno));
  83                 flag = 0;
  84         }
  85         flag |= O_NONBLOCK;
  86         if(fcntl(s, F_SETFL, flag) == -1) {
  87                 log_err("can't fcntl F_SETFL: %s", strerror(errno));
  88                 return 0;
  89         }
  90 #elif defined(HAVE_IOCTLSOCKET)
  91         unsigned long on = 1;
  92         if(ioctlsocket(s, FIONBIO, &on) != 0) {
  93                 log_err("can't ioctlsocket FIONBIO on: %s",
  94                         wsa_strerror(WSAGetLastError()));
  95         }
  96 #endif
  97         return 1;
  98 }
  99
 100 int
 101 fd_set_block(int s)
 102 {
 103 #ifdef HAVE_FCNTL
 104         int flag;
 105         if((flag = fcntl(s, F_GETFL)) == -1) {
 106                 log_err("cannot fcntl F_GETFL: %s", strerror(errno));
 107                 flag = 0;
 108         }
 109         flag &= ~O_NONBLOCK;
 110         if(fcntl(s, F_SETFL, flag) == -1) {
 111                 log_err("cannot fcntl F_SETFL: %s", strerror(errno));
 112                 return 0;
 113         }
 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()));
 119         }
 120 #endif
 121         return 1;
 122 }
 123
 124 int
 125 is_pow2(size_t num)
 126 {
 127         if(num == 0) return 1;
 128         return (num & (num-1)) == 0;
 129 }
 130
 131 void*
 132 memdup(void* data, size_t len)
 133 {
 134         void* d;
 135         if(!data) return NULL;
 136         if(len == 0) return NULL;
 137         d = malloc(len);
 138         if(!d) return NULL;
 139         memcpy(d, data, len);
 140         return d;
 141 }
 142
 143 void
 144 log_addr(enum verbosity_value v, const char* str,
 145         struct sockaddr_storage* addr, socklen_t addrlen)
 146 {
 147         uint16_t port;
 148         const char* family = "unknown";
 149         char dest[100];
 150         int af = (int)((struct sockaddr_in*)addr)->sin_family;
 151         void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
 152         if(verbosity < v)
 153                 return;
 154         switch(af) {
 155                 case AF_INET: family="ip4"; break;
 156                 case AF_INET6: family="ip6";
 157                         sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
 158                         break;
 159                 case AF_UNIX: family="unix"; break;
 160                 default: break;
 161         }
 162         if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
 163                 (void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
 164         }
 165         dest[sizeof(dest)-1] = 0;
 166         port = ntohs(((struct sockaddr_in*)addr)->sin_port);
 167         if(verbosity >= 4)
 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);
 171 }
 172
 173 int
 174 extstrtoaddr(const char* str, struct sockaddr_storage* addr,
 175         socklen_t* addrlen)
 176 {
 177         char* s;
 178         int port = UNBOUND_DNS_PORT;
 179         if((s=strchr(str, '@'))) {
 180                 char buf[MAX_ADDR_STRLEN];
 181                 if(s-str >= MAX_ADDR_STRLEN) {
 182                         return 0;
 183                 }
 184                 (void)strlcpy(buf, str, sizeof(buf));
 185                 buf[s-str] = 0;
 186                 port = atoi(s+1);
 187                 if(port == 0 && strcmp(s+1,"0")!=0) {
 188                         return 0;
 189                 }
 190                 return ipstrtoaddr(buf, port, addr, addrlen);
 191         }
 192         return ipstrtoaddr(str, port, addr, addrlen);
 193 }
 194
 195
 196 int
 197 ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
 198         socklen_t* addrlen)
 199 {
 200         uint16_t p;
 201         if(!ip) return 0;
 202         p = (uint16_t) port;
 203         if(str_is_ip6(ip)) {
 204                 char buf[MAX_ADDR_STRLEN];
 205                 char* s;
 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)
 213                                 return 0;
 214                         (void)strlcpy(buf, ip, sizeof(buf));
 215                         buf[s-ip]=0;
 216                         sa->sin6_scope_id = (uint32_t)atoi(s+1);
 217                         ip = buf;
 218                 }
 219                 if(inet_pton((int)sa->sin6_family, ip, &sa->sin6_addr) <= 0) {
 220                         return 0;
 221                 }
 222         } else { /* ip4 */
 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) {
 229                         return 0;
 230                 }
 231         }
 232         return 1;
 233 }
 234
 235 int netblockstrtoaddr(const char* str, int port, struct sockaddr_storage* addr,
 236         socklen_t* addrlen, int* net)
 237 {
 238         char* s = NULL;
 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);
 243                         return 0;
 244                 }
 245                 *net = atoi(s+1);
 246                 if(*net == 0 && strcmp(s+1, "0") != 0) {
 247                         log_err("cannot parse netblock: '%s'", str);
 248                         return 0;
 249                 }
 250                 if(!(s = strdup(str))) {
 251                         log_err("out of memory");
 252                         return 0;
 253                 }
 254                 *strchr(s, '/') = '\0';
 255         }
 256         if(!ipstrtoaddr(s?s:str, port, addr, addrlen)) {
 257                 free(s);
 258                 log_err("cannot parse ip address: '%s'", str);
 259                 return 0;
 260         }
 261         if(s) {
 262                 free(s);
 263                 addr_mask(addr, *addrlen, *net);
 264         }
 265         return 1;
 266 }
 267
 268 void
 269 log_nametypeclass(enum verbosity_value v, const char* str, uint8_t* name,
 270         uint16_t type, uint16_t dclass)
 271 {
 272         char buf[LDNS_MAX_DOMAINLEN+1];
 273         char t[12], c[12];
 274         const char *ts, *cs;
 275         if(verbosity < v)
 276                 return;
 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;
 286         else {
 287                 snprintf(t, sizeof(t), "TYPE%d", (int)type);
 288                 ts = t;
 289         }
 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;
 293         else {
 294                 snprintf(c, sizeof(c), "CLASS%d", (int)dclass);
 295                 cs = c;
 296         }
 297         log_info("%s %s %s %s", str, buf, ts, cs);
 298 }
 299
 300 void log_name_addr(enum verbosity_value v, const char* str, uint8_t* zone,
 301         struct sockaddr_storage* addr, socklen_t addrlen)
 302 {
 303         uint16_t port;
 304         const char* family = "unknown_family ";
 305         char namebuf[LDNS_MAX_DOMAINLEN+1];
 306         char dest[100];
 307         int af = (int)((struct sockaddr_in*)addr)->sin_family;
 308         void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
 309         if(verbosity < v)
 310                 return;
 311         switch(af) {
 312                 case AF_INET: family=""; break;
 313                 case AF_INET6: family="";
 314                         sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
 315                         break;
 316                 case AF_UNIX: family="unix_family "; break;
 317                 default: break;
 318         }
 319         if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
 320                 (void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
 321         }
 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);
 330 }
 331
 332 void log_err_addr(const char* str, const char* err,
 333         struct sockaddr_storage* addr, socklen_t addrlen)
 334 {
 335         uint16_t port;
 336         char dest[100];
 337         int af = (int)((struct sockaddr_in*)addr)->sin_family;
 338         void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
 339         if(af == AF_INET6)
 340                 sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
 341         if(inet_ntop(af, sinaddr, dest, (socklen_t)sizeof(dest)) == 0) {
 342                 (void)strlcpy(dest, "(inet_ntop error)", sizeof(dest));
 343         }
 344         dest[sizeof(dest)-1] = 0;
 345         port = ntohs(((struct sockaddr_in*)addr)->sin_port);
 346         if(verbosity >= 4)
 347                 log_err("%s: %s for %s port %d (len %d)", str, err, dest,
 348                         (int)port, (int)addrlen);
 349         else    log_err("%s: %s for %s", str, err, dest);
 350 }
 351
 352 int
 353 sockaddr_cmp(struct sockaddr_storage* addr1, socklen_t len1,
 354         struct sockaddr_storage* addr2, socklen_t len2)
 355 {
 356         struct sockaddr_in* p1_in = (struct sockaddr_in*)addr1;
 357         struct sockaddr_in* p2_in = (struct sockaddr_in*)addr2;
 358         struct sockaddr_in6* p1_in6 = (struct sockaddr_in6*)addr1;
 359         struct sockaddr_in6* p2_in6 = (struct sockaddr_in6*)addr2;
 360         if(len1 < len2)
 361                 return -1;
 362         if(len1 > len2)
 363                 return 1;
 364         log_assert(len1 == len2);
 365         if( p1_in->sin_family < p2_in->sin_family)
 366                 return -1;
 367         if( p1_in->sin_family > p2_in->sin_family)
 368                 return 1;
 369         log_assert( p1_in->sin_family == p2_in->sin_family );
 370         /* compare ip4 */
 371         if( p1_in->sin_family == AF_INET ) {
 372                 /* just order it, ntohs not required */
 373                 if(p1_in->sin_port < p2_in->sin_port)
 374                         return -1;
 375                 if(p1_in->sin_port > p2_in->sin_port)
 376                         return 1;
 377                 log_assert(p1_in->sin_port == p2_in->sin_port);
 378                 return memcmp(&p1_in->sin_addr, &p2_in->sin_addr, INET_SIZE);
 379         } else if (p1_in6->sin6_family == AF_INET6) {
 380                 /* just order it, ntohs not required */
 381                 if(p1_in6->sin6_port < p2_in6->sin6_port)
 382                         return -1;
 383                 if(p1_in6->sin6_port > p2_in6->sin6_port)
 384                         return 1;
 385                 log_assert(p1_in6->sin6_port == p2_in6->sin6_port);
 386                 return memcmp(&p1_in6->sin6_addr, &p2_in6->sin6_addr,
 387                         INET6_SIZE);
 388         } else {
 389                 /* eek unknown type, perform this comparison for sanity. */
 390                 return memcmp(addr1, addr2, len1);
 391         }
 392 }
 393
 394 int
 395 sockaddr_cmp_addr(struct sockaddr_storage* addr1, socklen_t len1,
 396         struct sockaddr_storage* addr2, socklen_t len2)
 397 {
 398         struct sockaddr_in* p1_in = (struct sockaddr_in*)addr1;
 399         struct sockaddr_in* p2_in = (struct sockaddr_in*)addr2;
 400         struct sockaddr_in6* p1_in6 = (struct sockaddr_in6*)addr1;
 401         struct sockaddr_in6* p2_in6 = (struct sockaddr_in6*)addr2;
 402         if(len1 < len2)
 403                 return -1;
 404         if(len1 > len2)
 405                 return 1;
 406         log_assert(len1 == len2);
 407         if( p1_in->sin_family < p2_in->sin_family)
 408                 return -1;
 409         if( p1_in->sin_family > p2_in->sin_family)
 410                 return 1;
 411         log_assert( p1_in->sin_family == p2_in->sin_family );
 412         /* compare ip4 */
 413         if( p1_in->sin_family == AF_INET ) {
 414                 return memcmp(&p1_in->sin_addr, &p2_in->sin_addr, INET_SIZE);
 415         } else if (p1_in6->sin6_family == AF_INET6) {
 416                 return memcmp(&p1_in6->sin6_addr, &p2_in6->sin6_addr,
 417                         INET6_SIZE);
 418         } else {
 419                 /* eek unknown type, perform this comparison for sanity. */
 420                 return memcmp(addr1, addr2, len1);
 421         }
 422 }
 423
 424 int
 425 addr_is_ip6(struct sockaddr_storage* addr, socklen_t len)
 426 {
 427         if(len == (socklen_t)sizeof(struct sockaddr_in6) &&
 428                 ((struct sockaddr_in6*)addr)->sin6_family == AF_INET6)
 429                 return 1;
 430         else    return 0;
 431 }
 432
 433 void
 434 addr_mask(struct sockaddr_storage* addr, socklen_t len, int net)
 435 {
 436         uint8_t mask[8] = {0x0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe};
 437         int i, max;
 438         uint8_t* s;
 439         if(addr_is_ip6(addr, len)) {
 440                 s = (uint8_t*)&((struct sockaddr_in6*)addr)->sin6_addr;
 441                 max = 128;
 442         } else {
 443                 s = (uint8_t*)&((struct sockaddr_in*)addr)->sin_addr;
 444                 max = 32;
 445         }
 446         if(net >= max)
 447                 return;
 448         for(i=net/8+1; i<max/8; i++) {
 449                 s[i] = 0;
 450         }
 451         s[net/8] &= mask[net&0x7];
 452 }
 453
 454 int
 455 addr_in_common(struct sockaddr_storage* addr1, int net1,
 456         struct sockaddr_storage* addr2, int net2, socklen_t addrlen)
 457 {
 458         int min = (net1<net2)?net1:net2;
 459         int i, to;
 460         int match = 0;
 461         uint8_t* s1, *s2;
 462         if(addr_is_ip6(addr1, addrlen)) {
 463                 s1 = (uint8_t*)&((struct sockaddr_in6*)addr1)->sin6_addr;
 464                 s2 = (uint8_t*)&((struct sockaddr_in6*)addr2)->sin6_addr;
 465                 to = 16;
 466         } else {
 467                 s1 = (uint8_t*)&((struct sockaddr_in*)addr1)->sin_addr;
 468                 s2 = (uint8_t*)&((struct sockaddr_in*)addr2)->sin_addr;
 469                 to = 4;
 470         }
 471         /* match = bits_in_common(s1, s2, to); */
 472         for(i=0; i<to; i++) {
 473                 if(s1[i] == s2[i]) {
 474                         match += 8;
 475                 } else {
 476                         uint8_t z = s1[i]^s2[i];
 477                         log_assert(z);
 478                         while(!(z&0x80)) {
 479                                 match++;
 480                                 z<<=1;
 481                         }
 482                         break;
 483                 }
 484         }
 485         if(match > min) match = min;
 486         return match;
 487 }
 488
 489 void
 490 addr_to_str(struct sockaddr_storage* addr, socklen_t addrlen,
 491         char* buf, size_t len)
 492 {
 493         int af = (int)((struct sockaddr_in*)addr)->sin_family;
 494         void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
 495         if(addr_is_ip6(addr, addrlen))
 496                 sinaddr = &((struct sockaddr_in6*)addr)->sin6_addr;
 497         if(inet_ntop(af, sinaddr, buf, (socklen_t)len) == 0) {
 498                 snprintf(buf, len, "(inet_ntop_error)");
 499         }
 500 }
 501
 502 int
 503 addr_is_ip4mapped(struct sockaddr_storage* addr, socklen_t addrlen)
 504 {
 505         /* prefix for ipv4 into ipv6 mapping is ::ffff:x.x.x.x */
 506         const uint8_t map_prefix[16] =
 507                 {0,0,0,0,  0,0,0,0, 0,0,0xff,0xff, 0,0,0,0};
 508         uint8_t* s;
 509         if(!addr_is_ip6(addr, addrlen))
 510                 return 0;
 511         /* s is 16 octet ipv6 address string */
 512         s = (uint8_t*)&((struct sockaddr_in6*)addr)->sin6_addr;
 513         return (memcmp(s, map_prefix, 12) == 0);
 514 }
 515
 516 int addr_is_broadcast(struct sockaddr_storage* addr, socklen_t addrlen)
 517 {
 518         int af = (int)((struct sockaddr_in*)addr)->sin_family;
 519         void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
 520         return af == AF_INET && addrlen>=(socklen_t)sizeof(struct sockaddr_in)
 521                 && memcmp(sinaddr, "\377\377\377\377", 4) == 0;
 522 }
 523
 524 int addr_is_any(struct sockaddr_storage* addr, socklen_t addrlen)
 525 {
 526         int af = (int)((struct sockaddr_in*)addr)->sin_family;
 527         void* sinaddr = &((struct sockaddr_in*)addr)->sin_addr;
 528         void* sin6addr = &((struct sockaddr_in6*)addr)->sin6_addr;
 529         if(af == AF_INET && addrlen>=(socklen_t)sizeof(struct sockaddr_in)
 530                 && memcmp(sinaddr, "\000\000\000\000", 4) == 0)
 531                 return 1;
 532         else if(af==AF_INET6 && addrlen>=(socklen_t)sizeof(struct sockaddr_in6)
 533                 && memcmp(sin6addr, "\000\000\000\000\000\000\000\000"
 534                 "\000\000\000\000\000\000\000\000", 16) == 0)
 535                 return 1;
 536         return 0;
 537 }
 538
 539 void sock_list_insert(struct sock_list** list, struct sockaddr_storage* addr,
 540         socklen_t len, struct regional* region)
 541 {
 542         struct sock_list* add = (struct sock_list*)regional_alloc(region,
 543                 sizeof(*add) - sizeof(add->addr) + (size_t)len);
 544         if(!add) {
 545                 log_err("out of memory in socketlist insert");
 546                 return;
 547         }
 548         log_assert(list);
 549         add->next = *list;
 550         add->len = len;
 551         *list = add;
 552         if(len) memmove(&add->addr, addr, len);
 553 }
 554
 555 void sock_list_prepend(struct sock_list** list, struct sock_list* add)
 556 {
 557         struct sock_list* last = add;
 558         if(!last)
 559                 return;
 560         while(last->next)
 561                 last = last->next;
 562         last->next = *list;
 563         *list = add;
 564 }
 565
 566 int sock_list_find(struct sock_list* list, struct sockaddr_storage* addr,
 567         socklen_t len)
 568 {
 569         while(list) {
 570                 if(len == list->len) {
 571                         if(len == 0 || sockaddr_cmp_addr(addr, len,
 572                                 &list->addr, list->len) == 0)
 573                                 return 1;
 574                 }
 575                 list = list->next;
 576         }
 577         return 0;
 578 }
 579
 580 void sock_list_merge(struct sock_list** list, struct regional* region,
 581         struct sock_list* add)
 582 {
 583         struct sock_list* p;
 584         for(p=add; p; p=p->next) {
 585                 if(!sock_list_find(*list, &p->addr, p->len))
 586                         sock_list_insert(list, &p->addr, p->len, region);
 587         }
 588 }
 589
 590 void
 591 log_crypto_err(const char* str)
 592 {
 593 #ifdef HAVE_SSL
 594         /* error:[error code]:[library name]:[function name]:[reason string] */
 595         char buf[128];
 596         unsigned long e;
 597         ERR_error_string_n(ERR_get_error(), buf, sizeof(buf));
 598         log_err("%s crypto %s", str, buf);
 599         while( (e=ERR_get_error()) ) {
 600                 ERR_error_string_n(e, buf, sizeof(buf));
 601                 log_err("and additionally crypto %s", buf);
 602         }
 603 #else
 604         (void)str;
 605 #endif /* HAVE_SSL */
 606 }
 607
 608 void* listen_sslctx_create(char* key, char* pem, char* verifypem)
 609 {
 610 #ifdef HAVE_SSL
 611         SSL_CTX* ctx = SSL_CTX_new(SSLv23_server_method());
 612         if(!ctx) {
 613                 log_crypto_err("could not SSL_CTX_new");
 614                 return NULL;
 615         }
 616         if(!SSL_CTX_use_certificate_file(ctx, pem, SSL_FILETYPE_PEM)) {
 617                 log_err("error for cert file: %s", pem);
 618                 log_crypto_err("error in SSL_CTX use_certificate_file");
 619                 SSL_CTX_free(ctx);
 620                 return NULL;
 621         }
 622         if(!SSL_CTX_use_PrivateKey_file(ctx, key, SSL_FILETYPE_PEM)) {
 623                 log_err("error for private key file: %s", key);
 624                 log_crypto_err("Error in SSL_CTX use_PrivateKey_file");
 625                 SSL_CTX_free(ctx);
 626                 return NULL;
 627         }
 628         if(!SSL_CTX_check_private_key(ctx)) {
 629                 log_err("error for key file: %s", key);
 630                 log_crypto_err("Error in SSL_CTX check_private_key");
 631                 SSL_CTX_free(ctx);
 632                 return NULL;
 633         }
 634
 635         if(verifypem && verifypem[0]) {
 636                 if(!SSL_CTX_load_verify_locations(ctx, verifypem, NULL)) {
 637                         log_crypto_err("Error in SSL_CTX verify locations");
 638                         SSL_CTX_free(ctx);
 639                         return NULL;
 640                 }
 641                 SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(
 642                         verifypem));
 643                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 644         }
 645         return ctx;
 646 #else
 647         (void)key; (void)pem; (void)verifypem;
 648         return NULL;
 649 #endif
 650 }
 651
 652 void* connect_sslctx_create(char* key, char* pem, char* verifypem)
 653 {
 654 #ifdef HAVE_SSL
 655         SSL_CTX* ctx = SSL_CTX_new(SSLv23_client_method());
 656         if(!ctx) {
 657                 log_crypto_err("could not allocate SSL_CTX pointer");
 658                 return NULL;
 659         }
 660         if(key && key[0]) {
 661                 if(!SSL_CTX_use_certificate_file(ctx, pem, SSL_FILETYPE_PEM)) {
 662                         log_err("error in client certificate %s", pem);
 663                         log_crypto_err("error in certificate file");
 664                         SSL_CTX_free(ctx);
 665                         return NULL;
 666                 }
 667                 if(!SSL_CTX_use_PrivateKey_file(ctx, key, SSL_FILETYPE_PEM)) {
 668                         log_err("error in client private key %s", key);
 669                         log_crypto_err("error in key file");
 670                         SSL_CTX_free(ctx);
 671                         return NULL;
 672                 }
 673                 if(!SSL_CTX_check_private_key(ctx)) {
 674                         log_err("error in client key %s", key);
 675                         log_crypto_err("error in SSL_CTX_check_private_key");
 676                         SSL_CTX_free(ctx);
 677                         return NULL;
 678                 }
 679         }
 680         if(verifypem && verifypem[0]) {
 681                 if(!SSL_CTX_load_verify_locations(ctx, verifypem, NULL)) {
 682                         log_crypto_err("error in SSL_CTX verify");
 683                         SSL_CTX_free(ctx);
 684                         return NULL;
 685                 }
 686                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 687         }
 688         return ctx;
 689 #else
 690         (void)key; (void)pem; (void)verifypem;
 691         return NULL;
 692 #endif
 693 }
 694
 695 void* incoming_ssl_fd(void* sslctx, int fd)
 696 {
 697 #ifdef HAVE_SSL
 698         SSL* ssl = SSL_new((SSL_CTX*)sslctx);
 699         if(!ssl) {
 700                 log_crypto_err("could not SSL_new");
 701                 return NULL;
 702         }
 703         SSL_set_accept_state(ssl);
 704         (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
 705         if(!SSL_set_fd(ssl, fd)) {
 706                 log_crypto_err("could not SSL_set_fd");
 707                 SSL_free(ssl);
 708                 return NULL;
 709         }
 710         return ssl;
 711 #else
 712         (void)sslctx; (void)fd;
 713         return NULL;
 714 #endif
 715 }
 716
 717 void* outgoing_ssl_fd(void* sslctx, int fd)
 718 {
 719 #ifdef HAVE_SSL
 720         SSL* ssl = SSL_new((SSL_CTX*)sslctx);
 721         if(!ssl) {
 722                 log_crypto_err("could not SSL_new");
 723                 return NULL;
 724         }
 725         SSL_set_connect_state(ssl);
 726         (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
 727         if(!SSL_set_fd(ssl, fd)) {
 728                 log_crypto_err("could not SSL_set_fd");
 729                 SSL_free(ssl);
 730                 return NULL;
 731         }
 732         return ssl;
 733 #else
 734         (void)sslctx; (void)fd;
 735         return NULL;
 736 #endif
 737 }
 738
 739 #if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
 740 /** global lock list for openssl locks */
 741 static lock_basic_t *ub_openssl_locks = NULL;
 742
 743 /** callback that gets thread id for openssl */
 744 static unsigned long
 745 ub_crypto_id_cb(void)
 746 {
 747         return (unsigned long)ub_thread_self();
 748 }
 749
 750 static void
 751 ub_crypto_lock_cb(int mode, int type, const char *ATTR_UNUSED(file),
 752         int ATTR_UNUSED(line))
 753 {
 754         if((mode&CRYPTO_LOCK)) {
 755                 lock_basic_lock(&ub_openssl_locks[type]);
 756         } else {
 757                 lock_basic_unlock(&ub_openssl_locks[type]);
 758         }
 759 }
 760 #endif /* OPENSSL_THREADS */
 761
 762 int ub_openssl_lock_init(void)
 763 {
 764 #if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
 765         int i;
 766         ub_openssl_locks = (lock_basic_t*)malloc(
 767                 sizeof(lock_basic_t)*CRYPTO_num_locks());
 768         if(!ub_openssl_locks)
 769                 return 0;
 770         for(i=0; i<CRYPTO_num_locks(); i++) {
 771                 lock_basic_init(&ub_openssl_locks[i]);
 772         }
 773         CRYPTO_set_id_callback(&ub_crypto_id_cb);
 774         CRYPTO_set_locking_callback(&ub_crypto_lock_cb);
 775 #endif /* OPENSSL_THREADS */
 776         return 1;
 777 }
 778
 779 void ub_openssl_lock_delete(void)
 780 {
 781 #if defined(HAVE_SSL) && defined(OPENSSL_THREADS) && !defined(THREADS_DISABLED)
 782         int i;
 783         if(!ub_openssl_locks)
 784                 return;
 785         CRYPTO_set_id_callback(NULL);
 786         CRYPTO_set_locking_callback(NULL);
 787         for(i=0; i<CRYPTO_num_locks(); i++) {
 788                 lock_basic_destroy(&ub_openssl_locks[i]);
 789         }
 790         free(ub_openssl_locks);
 791 #endif /* OPENSSL_THREADS */
 792 }
 793