1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
|
/* Convert socket address to string using Name Service Switch modules.
Copyright (C) 1997-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* The Inner Net License, Version 2.00
The author(s) grant permission for redistribution and use in source and
binary forms, with or without modification, of the software and documentation
provided that the following conditions are met:
0. If you receive a version of the software that is specifically labelled
as not being for redistribution (check the version message and/or README),
you are not permitted to redistribute that version of the software in any
way or form.
1. All terms of the all other applicable copyrights and licenses must be
followed.
2. Redistributions of source code must retain the authors' copyright
notice(s), this list of conditions, and the following disclaimer.
3. Redistributions in binary form must reproduce the authors' copyright
notice(s), this list of conditions, and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. [The copyright holder has authorized the removal of this clause.]
5. Neither the name(s) of the author(s) nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
If these license terms cause you a real problem, contact the author. */
/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */
#include <errno.h>
#include <netdb.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/utsname.h>
#include <libc-lock.h>
#include <scratch_buffer.h>
#ifdef HAVE_LIBIDN
# include <libidn/idna.h>
extern int __idna_to_unicode_lzlz (const char *input, char **output,
int flags);
#endif
#ifndef min
# define min(x,y) (((x) > (y)) ? (y) : (x))
#endif /* min */
libc_freeres_ptr (static char *domain);
static char *
internal_function
nrl_domainname (void)
{
static int not_first;
if (! not_first)
{
__libc_lock_define_initialized (static, lock);
__libc_lock_lock (lock);
if (! not_first)
{
char *c;
struct hostent *h, th;
int herror;
struct scratch_buffer tmpbuf;
scratch_buffer_init (&tmpbuf);
not_first = 1;
while (__gethostbyname_r ("localhost", &th,
tmpbuf.data, tmpbuf.length,
&h, &herror))
{
if (herror == NETDB_INTERNAL && errno == ERANGE)
{
if (!scratch_buffer_grow (&tmpbuf))
goto done;
}
else
break;
}
if (h && (c = strchr (h->h_name, '.')))
domain = __strdup (++c);
else
{
/* The name contains no domain information. Use the name
now to get more information. */
while (__gethostname (tmpbuf.data, tmpbuf.length))
if (!scratch_buffer_grow (&tmpbuf))
goto done;
if ((c = strchr (tmpbuf.data, '.')))
domain = __strdup (++c);
else
{
/* We need to preserve the hostname. */
const char *hstname = strdupa (tmpbuf.data);
while (__gethostbyname_r (hstname, &th,
tmpbuf.data, tmpbuf.length,
&h, &herror))
{
if (herror == NETDB_INTERNAL && errno == ERANGE)
{
if (!scratch_buffer_grow (&tmpbuf))
goto done;
}
else
break;
}
if (h && (c = strchr(h->h_name, '.')))
domain = __strdup (++c);
else
{
struct in_addr in_addr;
in_addr.s_addr = htonl (INADDR_LOOPBACK);
while (__gethostbyaddr_r ((const char *) &in_addr,
sizeof (struct in_addr),
AF_INET, &th,
tmpbuf.data, tmpbuf.length,
&h, &herror))
{
if (herror == NETDB_INTERNAL && errno == ERANGE)
{
if (!scratch_buffer_grow (&tmpbuf))
goto done;
}
else
break;
}
if (h && (c = strchr (h->h_name, '.')))
domain = __strdup (++c);
}
}
}
done:
scratch_buffer_free (&tmpbuf);
}
__libc_lock_unlock (lock);
}
return domain;
};
/* Copy a string to a destination buffer with length checking. Return
EAI_OVERFLOW if the buffer is not large enough, and 0 on
success. */
static int
checked_copy (char *dest, size_t destlen, const char *source)
{
size_t source_length = strlen (source);
if (source_length + 1 > destlen)
return EAI_OVERFLOW;
memcpy (dest, source, source_length + 1);
return 0;
}
/* Helper function for CHECKED_SNPRINTF below. */
static int
check_sprintf_result (int result, size_t destlen)
{
if (result < 0)
return EAI_SYSTEM;
if ((size_t) result >= destlen)
/* If ret == destlen, there was no room for the terminating NUL
character. */
return EAI_OVERFLOW;
return 0;
}
/* Format a string in the destination buffer. Return 0 on success,
EAI_OVERFLOW in case the buffer is too small, or EAI_SYSTEM on any
other error. */
#define CHECKED_SNPRINTF(dest, destlen, format, ...) \
check_sprintf_result \
(__snprintf (dest, destlen, format, __VA_ARGS__), destlen)
/* Convert host name, AF_INET/AF_INET6 case, name only. */
static int
gni_host_inet_name (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *host, socklen_t hostlen, int flags)
{
int herrno;
struct hostent th;
struct hostent *h = NULL;
if (sa->sa_family == AF_INET6)
{
const struct sockaddr_in6 *sin6p = (const struct sockaddr_in6 *) sa;
while (__gethostbyaddr_r (&sin6p->sin6_addr, sizeof(struct in6_addr),
AF_INET6, &th, tmpbuf->data, tmpbuf->length,
&h, &herrno))
if (herrno == NETDB_INTERNAL && errno == ERANGE)
{
if (!scratch_buffer_grow (tmpbuf))
{
__set_h_errno (herrno);
return EAI_MEMORY;
}
}
else
break;
}
else
{
const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
while (__gethostbyaddr_r (&sinp->sin_addr, sizeof(struct in_addr),
AF_INET, &th, tmpbuf->data, tmpbuf->length,
&h, &herrno))
if (herrno == NETDB_INTERNAL && errno == ERANGE)
{
if (!scratch_buffer_grow (tmpbuf))
{
__set_h_errno (herrno);
return EAI_MEMORY;
}
}
else
break;
}
if (h == NULL)
{
if (herrno == NETDB_INTERNAL)
{
__set_h_errno (herrno);
return EAI_SYSTEM;
}
if (herrno == TRY_AGAIN)
{
__set_h_errno (herrno);
return EAI_AGAIN;
}
}
if (h)
{
char *c;
if ((flags & NI_NOFQDN)
&& (c = nrl_domainname ())
&& (c = strstr (h->h_name, c))
&& (c != h->h_name) && (*(--c) == '.'))
/* Terminate the string after the prefix. */
*c = '\0';
#ifdef HAVE_LIBIDN
/* If requested, convert from the IDN format. */
if (flags & NI_IDN)
{
int idn_flags = 0;
if (flags & NI_IDN_ALLOW_UNASSIGNED)
idn_flags |= IDNA_ALLOW_UNASSIGNED;
if (flags & NI_IDN_USE_STD3_ASCII_RULES)
idn_flags |= IDNA_USE_STD3_ASCII_RULES;
char *out;
int rc = __idna_to_unicode_lzlz (h->h_name, &out,
idn_flags);
if (rc != IDNA_SUCCESS)
{
if (rc == IDNA_MALLOC_ERROR)
return EAI_MEMORY;
if (rc == IDNA_DLOPEN_ERROR)
return EAI_SYSTEM;
return EAI_IDN_ENCODE;
}
if (out != h->h_name)
{
h->h_name = strdupa (out);
free (out);
}
}
#endif
size_t len = strlen (h->h_name) + 1;
if (len > hostlen)
return EAI_OVERFLOW;
memcpy (host, h->h_name, len);
return 0;
}
return EAI_NONAME;
}
/* Convert host name, AF_INET/AF_INET6 case, numeric conversion. */
static int
gni_host_inet_numeric (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *host, socklen_t hostlen, int flags)
{
if (sa->sa_family == AF_INET6)
{
const struct sockaddr_in6 *sin6p = (const struct sockaddr_in6 *) sa;
if (inet_ntop (AF_INET6, &sin6p->sin6_addr, host, hostlen) == NULL)
return EAI_OVERFLOW;
uint32_t scopeid = sin6p->sin6_scope_id;
if (scopeid != 0)
{
size_t used_hostlen = __strnlen (host, hostlen);
/* Location of the scope string in the host buffer. */
char *scope_start = host + used_hostlen;
size_t scope_length = hostlen - used_hostlen;
if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr)
|| IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr))
{
char scopebuf[IFNAMSIZ];
if (if_indextoname (scopeid, scopebuf) != NULL)
return CHECKED_SNPRINTF
(scope_start, scope_length,
"%c%s", SCOPE_DELIMITER, scopebuf);
}
return CHECKED_SNPRINTF
(scope_start, scope_length, "%c%u", SCOPE_DELIMITER, scopeid);
}
}
else
{
const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
if (inet_ntop (AF_INET, &sinp->sin_addr, host, hostlen) == NULL)
return EAI_OVERFLOW;
}
return 0;
}
/* Convert AF_INET or AF_INET6 socket address, host part. */
static int
gni_host_inet (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *host, socklen_t hostlen, int flags)
{
if (!(flags & NI_NUMERICHOST))
{
int result = gni_host_inet_name
(tmpbuf, sa, addrlen, host, hostlen, flags);
if (result != EAI_NONAME)
return result;
}
if (flags & NI_NAMEREQD)
return EAI_NONAME;
else
return gni_host_inet_numeric
(tmpbuf, sa, addrlen, host, hostlen, flags);
}
/* Convert AF_LOCAL socket address, host part. */
static int
gni_host_local (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *host, socklen_t hostlen, int flags)
{
if (!(flags & NI_NUMERICHOST))
{
struct utsname utsname;
if (uname (&utsname) == 0)
return checked_copy (host, hostlen, utsname.nodename);
}
if (flags & NI_NAMEREQD)
return EAI_NONAME;
return checked_copy (host, hostlen, "localhost");
}
/* Convert the host part of an AF_LOCAK socket address. */
static int
gni_host (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *host, socklen_t hostlen, int flags)
{
switch (sa->sa_family)
{
case AF_INET:
case AF_INET6:
return gni_host_inet (tmpbuf, sa, addrlen, host, hostlen, flags);
case AF_LOCAL:
return gni_host_local (tmpbuf, sa, addrlen, host, hostlen, flags);
default:
return EAI_FAMILY;
}
}
/* Convert service to string, AF_INET and AF_INET6 variant. */
static int
gni_serv_inet (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *serv, socklen_t servlen, int flags)
{
_Static_assert
(offsetof (struct sockaddr_in, sin_port)
== offsetof (struct sockaddr_in6, sin6_port)
&& sizeof (((struct sockaddr_in) {}).sin_port) == sizeof (in_port_t)
&& sizeof (((struct sockaddr_in6) {}).sin6_port) == sizeof (in_port_t),
"AF_INET and AF_INET6 port consistency");
const struct sockaddr_in *sinp = (const struct sockaddr_in *) sa;
if (!(flags & NI_NUMERICSERV))
{
struct servent *s, ts;
int e;
while ((e = __getservbyport_r (sinp->sin_port,
((flags & NI_DGRAM)
? "udp" : "tcp"), &ts,
tmpbuf->data, tmpbuf->length, &s)))
{
if (e == ERANGE)
{
if (!scratch_buffer_grow (tmpbuf))
return EAI_MEMORY;
}
else
break;
}
if (s)
return checked_copy (serv, servlen, s->s_name);
/* Fall through to numeric conversion. */
}
return CHECKED_SNPRINTF (serv, servlen, "%d", ntohs (sinp->sin_port));
}
/* Convert service to string, AF_LOCAL variant. */
static int
gni_serv_local (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *serv, socklen_t servlen, int flags)
{
return checked_copy
(serv, servlen, ((const struct sockaddr_un *) sa)->sun_path);
}
/* Convert service to string, dispatching to the implementations
above. */
static int
gni_serv (struct scratch_buffer *tmpbuf,
const struct sockaddr *sa, socklen_t addrlen,
char *serv, socklen_t servlen, int flags)
{
switch (sa->sa_family)
{
case AF_INET:
case AF_INET6:
return gni_serv_inet (tmpbuf, sa, addrlen, serv, servlen, flags);
case AF_LOCAL:
return gni_serv_local (tmpbuf, sa, addrlen, serv, servlen, flags);
default:
return EAI_FAMILY;
}
}
int
getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
socklen_t hostlen, char *serv, socklen_t servlen,
int flags)
{
if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM
#ifdef HAVE_LIBIDN
|NI_IDN|NI_IDN_ALLOW_UNASSIGNED|NI_IDN_USE_STD3_ASCII_RULES
#endif
))
return EAI_BADFLAGS;
if (sa == NULL || addrlen < sizeof (sa_family_t))
return EAI_FAMILY;
if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL)
return EAI_NONAME;
switch (sa->sa_family)
{
case AF_LOCAL:
if (addrlen < (socklen_t) offsetof (struct sockaddr_un, sun_path))
return EAI_FAMILY;
break;
case AF_INET:
if (addrlen < sizeof (struct sockaddr_in))
return EAI_FAMILY;
break;
case AF_INET6:
if (addrlen < sizeof (struct sockaddr_in6))
return EAI_FAMILY;
break;
default:
return EAI_FAMILY;
}
struct scratch_buffer tmpbuf;
scratch_buffer_init (&tmpbuf);
if (host != NULL && hostlen > 0)
{
int result = gni_host (&tmpbuf, sa, addrlen, host, hostlen, flags);
if (result != 0)
{
scratch_buffer_free (&tmpbuf);
return result;
}
}
if (serv && (servlen > 0))
{
int result = gni_serv (&tmpbuf, sa, addrlen, serv, servlen, flags);
if (result != 0)
{
scratch_buffer_free (&tmpbuf);
return result;
}
}
scratch_buffer_free (&tmpbuf);
return 0;
}
libc_hidden_def (getnameinfo)
|