external/bsd/ntp/dist/libntp/ntp_rfc2553.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Copyright (c) 1982, 1986, 1990, 1993
  34  *      The Regents of the University of California.  All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. All advertising materials mentioning features or use of this software
  45  *    must display the following acknowledgement:
  46  *      This product includes software developed by the University of
  47  *      California, Berkeley and its contributors.
  48  * 4. Neither the name of the University nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  *
  64  */
  65
  66 /*
  67  * Compatability shims with the rfc2553 API to simplify ntp.
  68  */
  69
  70 #include <config.h>
  71
  72 #include <sys/types.h>
  73 #include <ctype.h>
  74 #ifdef HAVE_SYS_SOCKET_H
  75 #include <sys/socket.h>
  76 #endif
  77 #include <isc/net.h>
  78 #ifdef HAVE_NETINET_IN_H
  79 #include <netinet/in.h>
  80 #endif
  81 #include "ntp_rfc2553.h"
  82
  83 #include "ntpd.h"
  84 #include "ntp_malloc.h"
  85 #include "ntp_stdlib.h"
  86 #include "ntp_string.h"
  87
  88 #ifndef ISC_PLATFORM_HAVEIPV6
  89
  90 static char *ai_errlist[] = {
  91         "Success",
  92         "Address family for hostname not supported",    /* EAI_ADDRFAMILY */
  93         "Temporary failure in name resolution",         /* EAI_AGAIN      */
  94         "Invalid value for ai_flags",                   /* EAI_BADFLAGS   */
  95         "Non-recoverable failure in name resolution",   /* EAI_FAIL       */
  96         "ai_family not supported",                      /* EAI_FAMILY     */
  97         "Memory allocation failure",                    /* EAI_MEMORY     */
  98         "No address associated with hostname",          /* EAI_NODATA     */
  99         "hostname nor servname provided, or not known", /* EAI_NONAME     */
 100         "servname not supported for ai_socktype",       /* EAI_SERVICE    */
 101         "ai_socktype not supported",                    /* EAI_SOCKTYPE   */
 102         "System error returned in errno",               /* EAI_SYSTEM     */
 103         "Invalid value for hints",                      /* EAI_BADHINTS   */
 104         "Resolved protocol is unknown",                 /* EAI_PROTOCOL   */
 105         "Unknown error",                                /* EAI_MAX        */
 106 };
 107
 108 /*
 109  * Local declaration
 110  */
 111 int
 112 DNSlookup_name(
 113         const char *name,
 114         int ai_family,
 115         struct hostent **Addresses
 116 );
 117
 118 #ifndef SYS_WINNT
 119 /*
 120  * Encapsulate gethostbyname to control the error code
 121  */
 122 int
 123 DNSlookup_name(
 124         const char *name,
 125         int ai_family,
 126         struct hostent **Addresses
 127 )
 128 {
 129         *Addresses = gethostbyname(name);
 130         return (h_errno);
 131 }
 132 #endif
 133
 134 static  int do_nodename (const char *nodename, struct addrinfo *ai,
 135     const struct addrinfo *hints);
 136
 137 int
 138 getaddrinfo (const char *nodename, const char *servname,
 139         const struct addrinfo *hints, struct addrinfo **res)
 140 {
 141         int rval;
 142         struct servent *sp;
 143         struct addrinfo *ai = NULL;
 144         int port;
 145         const char *proto = NULL;
 146         int family, socktype, flags, protocol;
 147
 148
 149         /*
 150          * If no name is provide just return an error
 151          */
 152         if (nodename == NULL && servname == NULL)
 153                 return (EAI_NONAME);
 154
 155         ai = calloc(sizeof(struct addrinfo), 1);
 156         if (ai == NULL)
 157                 return (EAI_MEMORY);
 158
 159         /*
 160          * Copy default values from hints, if available
 161          */
 162         if (hints != NULL) {
 163                 ai->ai_flags = hints->ai_flags;
 164                 ai->ai_family = hints->ai_family;
 165                 ai->ai_socktype = hints->ai_socktype;
 166                 ai->ai_protocol = hints->ai_protocol;
 167
 168                 family = hints->ai_family;
 169                 socktype = hints->ai_socktype;
 170                 protocol = hints->ai_protocol;
 171                 flags = hints->ai_flags;
 172
 173                 switch (family) {
 174                 case AF_UNSPEC:
 175                         switch (hints->ai_socktype) {
 176                         case SOCK_STREAM:
 177                                 proto = "tcp";
 178                                 break;
 179                         case SOCK_DGRAM:
 180                                 proto = "udp";
 181                                 break;
 182                         }
 183                         break;
 184                 case AF_INET:
 185                 case AF_INET6:
 186                         switch (hints->ai_socktype) {
 187                         case 0:
 188                                 break;
 189                         case SOCK_STREAM:
 190                                 proto = "tcp";
 191                                 break;
 192                         case SOCK_DGRAM:
 193                                 proto = "udp";
 194                                 break;
 195                         case SOCK_RAW:
 196                                 break;
 197                         default:
 198                                 return (EAI_SOCKTYPE);
 199                         }
 200                         break;
 201 #ifdef  AF_LOCAL
 202                 case AF_LOCAL:
 203                         switch (hints->ai_socktype) {
 204                         case 0:
 205                                 break;
 206                         case SOCK_STREAM:
 207                                 break;
 208                         case SOCK_DGRAM:
 209                                 break;
 210                         default:
 211                                 return (EAI_SOCKTYPE);
 212                         }
 213                         break;
 214 #endif
 215                 default:
 216                         return (EAI_FAMILY);
 217                 }
 218         } else {
 219                 protocol = 0;
 220                 family = 0;
 221                 socktype = 0;
 222                 flags = 0;
 223         }
 224
 225         rval = do_nodename(nodename, ai, hints);
 226         if (rval != 0) {
 227                 freeaddrinfo(ai);
 228                 return (rval);
 229         }
 230
 231         /*
 232          * First, look up the service name (port) if it was
 233          * requested.  If the socket type wasn't specified, then
 234          * try and figure it out.
 235          */
 236         if (servname != NULL) {
 237                 char *e;
 238
 239                 port = strtol(servname, &e, 10);
 240                 if (*e == '\0') {
 241                         if (socktype == 0)
 242                                 return (EAI_SOCKTYPE);
 243                         if (port < 0 || port > 65535)
 244                                 return (EAI_SERVICE);
 245                         port = htons((unsigned short) port);
 246                 } else {
 247                         sp = getservbyname(servname, proto);
 248                         if (sp == NULL)
 249                                 return (EAI_SERVICE);
 250                         port = sp->s_port;
 251                         if (socktype == 0) {
 252                                 if (strcmp(sp->s_proto, "tcp") == 0)
 253                                         socktype = SOCK_STREAM;
 254                                 else if (strcmp(sp->s_proto, "udp") == 0)
 255                                         socktype = SOCK_DGRAM;
 256                         }
 257                 }
 258         } else
 259                 port = 0;
 260
 261         /*
 262          *
 263          * Set up the port number
 264          */
 265         if (ai->ai_family == AF_INET)
 266                 ((struct sockaddr_in *)ai->ai_addr)->sin_port = (unsigned short) port;
 267         else if (ai->ai_family == AF_INET6)
 268                 ((struct sockaddr_in6 *)ai->ai_addr)->sin6_port = (unsigned short) port;
 269         *res = ai;
 270         return (0);
 271 }
 272
 273 void
 274 freeaddrinfo(struct addrinfo *ai)
 275 {
 276         if (ai->ai_canonname != NULL)
 277         {
 278                 free(ai->ai_canonname);
 279                 ai->ai_canonname = NULL;
 280         }
 281         if (ai->ai_addr != NULL)
 282         {
 283                 free(ai->ai_addr);
 284                 ai->ai_addr = NULL;
 285         }
 286         free(ai);
 287         ai = NULL;
 288 }
 289
 290 int
 291 getnameinfo (const struct sockaddr *sa, u_int salen, char *host,
 292         size_t hostlen, char *serv, size_t servlen, int flags)
 293 {
 294         struct hostent *hp;
 295         int namelen;
 296
 297         if (sa->sa_family != AF_INET)
 298                 return (EAI_FAMILY);
 299         hp = gethostbyaddr(
 300             (const char *)&((const struct sockaddr_in *)sa)->sin_addr,
 301             4, AF_INET);
 302         if (hp == NULL) {
 303                 if (h_errno == TRY_AGAIN)
 304                         return (EAI_AGAIN);
 305                 else
 306                         return (EAI_FAIL);
 307         }
 308         if (host != NULL && hostlen > 0) {
 309                 /*
 310                  * Don't exceed buffer
 311                  */
 312                 namelen = min(strlen(hp->h_name), hostlen - 1);
 313                 if (namelen > 0) {
 314                         strncpy(host, hp->h_name, namelen);
 315                         host[namelen] = '\0';
 316                 }
 317         }
 318         return (0);
 319 }
 320
 321 char *
 322 gai_strerror(int ecode)
 323 {
 324         if (ecode < 0 || ecode > EAI_MAX)
 325                 ecode = EAI_MAX;
 326         return ai_errlist[ecode];
 327 }
 328
 329 static int
 330 do_nodename(
 331         const char *nodename,
 332         struct addrinfo *ai,
 333         const struct addrinfo *hints)
 334 {
 335         struct hostent *hp = NULL;
 336         struct sockaddr_in *sockin;
 337         struct sockaddr_in6 *sockin6;
 338         int errval;
 339
 340         ai->ai_addr = calloc(sizeof(struct sockaddr_storage), 1);
 341         if (ai->ai_addr == NULL)
 342                 return (EAI_MEMORY);
 343
 344         /*
 345          * For an empty node name just use the wildcard.
 346          * NOTE: We need to assume that the address family is
 347          * set elsewhere so that we can set the appropriate wildcard
 348          */
 349         if (nodename == NULL) {
 350                 ai->ai_addrlen = sizeof(struct sockaddr_storage);
 351                 if (ai->ai_family == AF_INET)
 352                 {
 353                         sockin = (struct sockaddr_in *)ai->ai_addr;
 354                         sockin->sin_family = (short) ai->ai_family;
 355                         sockin->sin_addr.s_addr = htonl(INADDR_ANY);
 356                 }
 357                 else
 358                 {
 359                         sockin6 = (struct sockaddr_in6 *)ai->ai_addr;
 360                         sockin6->sin6_family = (short) ai->ai_family;
 361                         /*
 362                          * we have already zeroed out the address
 363                          * so we don't actually need to do this
 364                          * This assignment is causing problems so
 365                          * we don't do what this would do.
 366                          sockin6->sin6_addr = in6addr_any;
 367                          */
 368                 }
 369 #ifdef ISC_PLATFORM_HAVESALEN
 370                 ai->ai_addr->sa_len = SOCKLEN(ai->ai_addr);
 371 #endif
 372
 373                 return (0);
 374         }
 375
 376         /*
 377          * See if we have an IPv6 address
 378          */
 379         if(strchr(nodename, ':') != NULL) {
 380                 if (inet_pton(AF_INET6, nodename,
 381                     &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr) == 1) {
 382                         ((struct sockaddr_in6 *)ai->ai_addr)->sin6_family = AF_INET6;
 383                         ai->ai_family = AF_INET6;
 384                         ai->ai_addrlen = sizeof(struct sockaddr_in6);
 385                         return (0);
 386                 }
 387         }
 388
 389         /*
 390          * See if we have an IPv4 address
 391          */
 392         if (inet_pton(AF_INET, nodename,
 393             &((struct sockaddr_in *)ai->ai_addr)->sin_addr) == 1) {
 394                 ((struct sockaddr *)ai->ai_addr)->sa_family = AF_INET;
 395                 ai->ai_family = AF_INET;
 396                 ai->ai_addrlen = sizeof(struct sockaddr_in);
 397                 return (0);
 398         }
 399
 400         /*
 401          * If the numeric host flag is set, don't attempt resolution
 402          */
 403         if (hints != NULL && (hints->ai_flags & AI_NUMERICHOST))
 404                 return (EAI_NONAME);
 405
 406         /*
 407          * Look for a name
 408          */
 409
 410         errval = DNSlookup_name(nodename, AF_INET, &hp);
 411
 412         if (hp == NULL) {
 413                 if (errval == TRY_AGAIN || errval == EAI_AGAIN)
 414                         return (EAI_AGAIN);
 415                 else if (errval == EAI_NONAME) {
 416                         if (inet_pton(AF_INET, nodename,
 417                             &((struct sockaddr_in *)ai->ai_addr)->sin_addr) == 1) {
 418                                 ((struct sockaddr *)ai->ai_addr)->sa_family = AF_INET;
 419                                 ai->ai_family = AF_INET;
 420                                 ai->ai_addrlen = sizeof(struct sockaddr_in);
 421                                 return (0);
 422                         }
 423                         return (errval);
 424                 }
 425                 else
 426                 {
 427                         return (errval);
 428                 }
 429         }
 430         ai->ai_family = hp->h_addrtype;
 431         ai->ai_addrlen = sizeof(struct sockaddr);
 432         sockin = (struct sockaddr_in *)ai->ai_addr;
 433         memcpy(&sockin->sin_addr, hp->h_addr, hp->h_length);
 434         ai->ai_addr->sa_family = hp->h_addrtype;
 435 #ifdef ISC_PLATFORM_HAVESALEN
 436         ai->ai_addr->sa_len = sizeof(struct sockaddr);
 437 #endif
 438         if (hints != NULL && hints->ai_flags & AI_CANONNAME)
 439                 ai->ai_canonname = estrdup(hp->h_name);
 440         return (0);
 441 }
 442
 443 #endif /* !ISC_PLATFORM_HAVEIPV6 */