xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* The Inner Net License, Version 2.00 |
| 2 | |
| 3 | The author(s) grant permission for redistribution and use in source and |
| 4 | binary forms, with or without modification, of the software and documentation |
| 5 | provided that the following conditions are met: |
| 6 | |
| 7 | 0. If you receive a version of the software that is specifically labelled |
| 8 | as not being for redistribution (check the version message and/or README), |
| 9 | you are not permitted to redistribute that version of the software in any |
| 10 | way or form. |
| 11 | 1. All terms of the all other applicable copyrights and licenses must be |
| 12 | followed. |
| 13 | 2. Redistributions of source code must retain the authors' copyright |
| 14 | notice(s), this list of conditions, and the following disclaimer. |
| 15 | 3. Redistributions in binary form must reproduce the authors' copyright |
| 16 | notice(s), this list of conditions, and the following disclaimer in the |
| 17 | documentation and/or other materials provided with the distribution. |
| 18 | 4. [The copyright holder has authorized the removal of this clause.] |
| 19 | 5. Neither the name(s) of the author(s) nor the names of its contributors |
| 20 | may be used to endorse or promote products derived from this software |
| 21 | without specific prior written permission. |
| 22 | |
| 23 | THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY |
| 24 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 25 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 26 | DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY |
| 27 | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| 28 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 29 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| 30 | ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 31 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 32 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | |
| 34 | If these license terms cause you a real problem, contact the author. */ |
| 35 | |
| 36 | /* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */ |
| 37 | |
| 38 | #include <errno.h> |
| 39 | #include <netdb.h> |
| 40 | #include <stddef.h> |
| 41 | #include <stdlib.h> |
| 42 | #include <stdio.h> |
| 43 | #include <string.h> |
| 44 | #include <unistd.h> |
| 45 | #include <stdint.h> |
| 46 | #include <arpa/inet.h> |
| 47 | #include <net/if.h> |
| 48 | #include <netinet/in.h> |
| 49 | #include <sys/param.h> |
| 50 | #include <sys/socket.h> |
| 51 | #include <sys/types.h> |
| 52 | #include <sys/un.h> |
| 53 | #include <sys/utsname.h> |
| 54 | #include <libc-lock.h> |
| 55 | #include <scratch_buffer.h> |
| 56 | |
| 57 | #ifdef HAVE_LIBIDN |
| 58 | # include <libidn/idna.h> |
| 59 | extern int __idna_to_unicode_lzlz (const char *input, char **output, |
| 60 | int flags); |
| 61 | #endif |
| 62 | |
| 63 | #ifndef min |
| 64 | # define min(x,y) (((x) > (y)) ? (y) : (x)) |
| 65 | #endif /* min */ |
| 66 | |
| 67 | libc_freeres_ptr (static char *domain); |
| 68 | |
| 69 | |
| 70 | static char * |
| 71 | internal_function |
| 72 | nrl_domainname (void) |
| 73 | { |
| 74 | static int not_first; |
| 75 | |
| 76 | if (! not_first) |
| 77 | { |
| 78 | __libc_lock_define_initialized (static, lock); |
| 79 | __libc_lock_lock (lock); |
| 80 | |
| 81 | if (! not_first) |
| 82 | { |
| 83 | char *c; |
| 84 | struct hostent *h, th; |
| 85 | int herror; |
| 86 | struct scratch_buffer tmpbuf; |
| 87 | |
| 88 | scratch_buffer_init (&tmpbuf); |
| 89 | not_first = 1; |
| 90 | |
| 91 | while (__gethostbyname_r ("localhost", &th, |
| 92 | tmpbuf.data, tmpbuf.length, |
| 93 | &h, &herror)) |
| 94 | { |
| 95 | if (herror == NETDB_INTERNAL && errno == ERANGE) |
| 96 | { |
| 97 | if (!scratch_buffer_grow (&tmpbuf)) |
| 98 | goto done; |
| 99 | } |
| 100 | else |
| 101 | break; |
| 102 | } |
| 103 | |
| 104 | if (h && (c = strchr (h->h_name, '.'))) |
| 105 | domain = __strdup (++c); |
| 106 | else |
| 107 | { |
| 108 | /* The name contains no domain information. Use the name |
| 109 | now to get more information. */ |
| 110 | while (__gethostname (tmpbuf.data, tmpbuf.length)) |
| 111 | if (!scratch_buffer_grow (&tmpbuf)) |
| 112 | goto done; |
| 113 | |
| 114 | if ((c = strchr (tmpbuf.data, '.'))) |
| 115 | domain = __strdup (++c); |
| 116 | else |
| 117 | { |
| 118 | /* We need to preserve the hostname. */ |
| 119 | const char *hstname = strdupa (tmpbuf.data); |
| 120 | |
| 121 | while (__gethostbyname_r (hstname, &th, |
| 122 | tmpbuf.data, tmpbuf.length, |
| 123 | &h, &herror)) |
| 124 | { |
| 125 | if (herror == NETDB_INTERNAL && errno == ERANGE) |
| 126 | { |
| 127 | if (!scratch_buffer_grow (&tmpbuf)) |
| 128 | goto done; |
| 129 | } |
| 130 | else |
| 131 | break; |
| 132 | } |
| 133 | |
| 134 | if (h && (c = strchr(h->h_name, '.'))) |
| 135 | domain = __strdup (++c); |
| 136 | else |
| 137 | { |
| 138 | struct in_addr in_addr; |
| 139 | |
| 140 | in_addr.s_addr = htonl (INADDR_LOOPBACK); |
| 141 | |
| 142 | while (__gethostbyaddr_r ((const char *) &in_addr, |
| 143 | sizeof (struct in_addr), |
| 144 | AF_INET, &th, |
| 145 | tmpbuf.data, tmpbuf.length, |
| 146 | &h, &herror)) |
| 147 | { |
| 148 | if (herror == NETDB_INTERNAL && errno == ERANGE) |
| 149 | { |
| 150 | if (!scratch_buffer_grow (&tmpbuf)) |
| 151 | goto done; |
| 152 | } |
| 153 | else |
| 154 | break; |
| 155 | } |
| 156 | |
| 157 | if (h && (c = strchr (h->h_name, '.'))) |
| 158 | domain = __strdup (++c); |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | done: |
| 163 | scratch_buffer_free (&tmpbuf); |
| 164 | } |
| 165 | |
| 166 | __libc_lock_unlock (lock); |
| 167 | } |
| 168 | |
| 169 | return domain; |
| 170 | }; |
| 171 | |
| 172 | |
| 173 | int |
| 174 | getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host, |
| 175 | socklen_t hostlen, char *serv, socklen_t servlen, |
| 176 | int flags) |
| 177 | { |
| 178 | int serrno = errno; |
| 179 | int herrno; |
| 180 | struct hostent th; |
| 181 | int ok = 0; |
| 182 | struct scratch_buffer tmpbuf; |
| 183 | |
| 184 | scratch_buffer_init (&tmpbuf); |
| 185 | |
| 186 | if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM |
| 187 | #ifdef HAVE_LIBIDN |
| 188 | |NI_IDN|NI_IDN_ALLOW_UNASSIGNED|NI_IDN_USE_STD3_ASCII_RULES |
| 189 | #endif |
| 190 | )) |
| 191 | return EAI_BADFLAGS; |
| 192 | |
| 193 | if (sa == NULL || addrlen < sizeof (sa_family_t)) |
| 194 | return EAI_FAMILY; |
| 195 | |
| 196 | if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL) |
| 197 | return EAI_NONAME; |
| 198 | |
| 199 | switch (sa->sa_family) |
| 200 | { |
| 201 | case AF_LOCAL: |
| 202 | if (addrlen < (socklen_t) offsetof (struct sockaddr_un, sun_path)) |
| 203 | return EAI_FAMILY; |
| 204 | break; |
| 205 | case AF_INET: |
| 206 | if (addrlen < sizeof (struct sockaddr_in)) |
| 207 | return EAI_FAMILY; |
| 208 | break; |
| 209 | case AF_INET6: |
| 210 | if (addrlen < sizeof (struct sockaddr_in6)) |
| 211 | return EAI_FAMILY; |
| 212 | break; |
| 213 | default: |
| 214 | return EAI_FAMILY; |
| 215 | } |
| 216 | |
| 217 | if (host != NULL && hostlen > 0) |
| 218 | switch (sa->sa_family) |
| 219 | { |
| 220 | case AF_INET: |
| 221 | case AF_INET6: |
| 222 | if (!(flags & NI_NUMERICHOST)) |
| 223 | { |
| 224 | struct hostent *h = NULL; |
| 225 | if (sa->sa_family == AF_INET6) |
| 226 | { |
| 227 | while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr), |
| 228 | sizeof(struct in6_addr), |
| 229 | AF_INET6, &th, |
| 230 | tmpbuf.data, tmpbuf.length, |
| 231 | &h, &herrno)) |
| 232 | if (herrno == NETDB_INTERNAL && errno == ERANGE) |
| 233 | { |
| 234 | if (!scratch_buffer_grow (&tmpbuf)) |
| 235 | { |
| 236 | __set_h_errno (herrno); |
| 237 | return EAI_MEMORY; |
| 238 | } |
| 239 | } |
| 240 | else |
| 241 | break; |
| 242 | } |
| 243 | else |
| 244 | { |
| 245 | while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->sin_addr), |
| 246 | sizeof(struct in_addr), |
| 247 | AF_INET, &th, |
| 248 | tmpbuf.data, tmpbuf.length, |
| 249 | &h, &herrno)) |
| 250 | if (herrno == NETDB_INTERNAL && errno == ERANGE) |
| 251 | { |
| 252 | if (!scratch_buffer_grow (&tmpbuf)) |
| 253 | { |
| 254 | __set_h_errno (herrno); |
| 255 | return EAI_MEMORY; |
| 256 | } |
| 257 | } |
| 258 | else |
| 259 | break; |
| 260 | } |
| 261 | |
| 262 | if (h == NULL) |
| 263 | { |
| 264 | if (herrno == NETDB_INTERNAL) |
| 265 | { |
| 266 | __set_h_errno (herrno); |
| 267 | return EAI_SYSTEM; |
| 268 | } |
| 269 | if (herrno == TRY_AGAIN) |
| 270 | { |
| 271 | __set_h_errno (herrno); |
| 272 | return EAI_AGAIN; |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | if (h) |
| 277 | { |
| 278 | char *c; |
| 279 | if ((flags & NI_NOFQDN) |
| 280 | && (c = nrl_domainname ()) |
| 281 | && (c = strstr (h->h_name, c)) |
| 282 | && (c != h->h_name) && (*(--c) == '.')) |
| 283 | /* Terminate the string after the prefix. */ |
| 284 | *c = '\0'; |
| 285 | |
| 286 | #ifdef HAVE_LIBIDN |
| 287 | /* If requested, convert from the IDN format. */ |
| 288 | if (flags & NI_IDN) |
| 289 | { |
| 290 | int idn_flags = 0; |
| 291 | if (flags & NI_IDN_ALLOW_UNASSIGNED) |
| 292 | idn_flags |= IDNA_ALLOW_UNASSIGNED; |
| 293 | if (flags & NI_IDN_USE_STD3_ASCII_RULES) |
| 294 | idn_flags |= IDNA_USE_STD3_ASCII_RULES; |
| 295 | |
| 296 | char *out; |
| 297 | int rc = __idna_to_unicode_lzlz (h->h_name, &out, |
| 298 | idn_flags); |
| 299 | if (rc != IDNA_SUCCESS) |
| 300 | { |
| 301 | if (rc == IDNA_MALLOC_ERROR) |
| 302 | return EAI_MEMORY; |
| 303 | if (rc == IDNA_DLOPEN_ERROR) |
| 304 | return EAI_SYSTEM; |
| 305 | return EAI_IDN_ENCODE; |
| 306 | } |
| 307 | |
| 308 | if (out != h->h_name) |
| 309 | { |
| 310 | h->h_name = strdupa (out); |
| 311 | free (out); |
| 312 | } |
| 313 | } |
| 314 | #endif |
| 315 | |
| 316 | size_t len = strlen (h->h_name) + 1; |
| 317 | if (len > hostlen) |
| 318 | return EAI_OVERFLOW; |
| 319 | |
| 320 | memcpy (host, h->h_name, len); |
| 321 | |
| 322 | ok = 1; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | if (!ok) |
| 327 | { |
| 328 | if (flags & NI_NAMEREQD) |
| 329 | { |
| 330 | __set_errno (serrno); |
| 331 | return EAI_NONAME; |
| 332 | } |
| 333 | else |
| 334 | { |
| 335 | const char *c; |
| 336 | if (sa->sa_family == AF_INET6) |
| 337 | { |
| 338 | const struct sockaddr_in6 *sin6p; |
| 339 | uint32_t scopeid; |
| 340 | |
| 341 | sin6p = (const struct sockaddr_in6 *) sa; |
| 342 | |
| 343 | c = inet_ntop (AF_INET6, |
| 344 | (const void *) &sin6p->sin6_addr, host, hostlen); |
| 345 | scopeid = sin6p->sin6_scope_id; |
| 346 | if (scopeid != 0) |
| 347 | { |
| 348 | /* Buffer is >= IFNAMSIZ+1. */ |
| 349 | char scopebuf[IFNAMSIZ + 1]; |
| 350 | char *scopeptr; |
| 351 | int ni_numericscope = 0; |
| 352 | size_t real_hostlen = __strnlen (host, hostlen); |
| 353 | size_t scopelen = 0; |
| 354 | |
| 355 | scopebuf[0] = SCOPE_DELIMITER; |
| 356 | scopebuf[1] = '\0'; |
| 357 | scopeptr = &scopebuf[1]; |
| 358 | |
| 359 | if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr) |
| 360 | || IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr)) |
| 361 | { |
| 362 | if (if_indextoname (scopeid, scopeptr) == NULL) |
| 363 | ++ni_numericscope; |
| 364 | else |
| 365 | scopelen = strlen (scopebuf); |
| 366 | } |
| 367 | else |
| 368 | ++ni_numericscope; |
| 369 | |
| 370 | if (ni_numericscope) |
| 371 | scopelen = 1 + __snprintf (scopeptr, |
| 372 | (scopebuf |
| 373 | + sizeof scopebuf |
| 374 | - scopeptr), |
| 375 | "%u", scopeid); |
| 376 | |
| 377 | if (real_hostlen + scopelen + 1 > hostlen) |
| 378 | /* Signal the buffer is too small. This is |
| 379 | what inet_ntop does. */ |
| 380 | c = NULL; |
| 381 | else |
| 382 | memcpy (host + real_hostlen, scopebuf, scopelen + 1); |
| 383 | } |
| 384 | } |
| 385 | else |
| 386 | c = inet_ntop (AF_INET, |
| 387 | (const void *) &(((const struct sockaddr_in *) sa)->sin_addr), |
| 388 | host, hostlen); |
| 389 | if (c == NULL) |
| 390 | return EAI_OVERFLOW; |
| 391 | } |
| 392 | ok = 1; |
| 393 | } |
| 394 | break; |
| 395 | |
| 396 | case AF_LOCAL: |
| 397 | if (!(flags & NI_NUMERICHOST)) |
| 398 | { |
| 399 | struct utsname utsname; |
| 400 | |
| 401 | if (!uname (&utsname)) |
| 402 | { |
| 403 | strncpy (host, utsname.nodename, hostlen); |
| 404 | break; |
| 405 | }; |
| 406 | }; |
| 407 | |
| 408 | if (flags & NI_NAMEREQD) |
| 409 | { |
| 410 | __set_errno (serrno); |
| 411 | return EAI_NONAME; |
| 412 | } |
| 413 | |
| 414 | strncpy (host, "localhost", hostlen); |
| 415 | break; |
| 416 | |
| 417 | default: |
| 418 | return EAI_FAMILY; |
| 419 | } |
| 420 | |
| 421 | if (serv && (servlen > 0)) |
| 422 | switch (sa->sa_family) |
| 423 | { |
| 424 | case AF_INET: |
| 425 | case AF_INET6: |
| 426 | if (!(flags & NI_NUMERICSERV)) |
| 427 | { |
| 428 | struct servent *s, ts; |
| 429 | int e; |
| 430 | while ((e = __getservbyport_r (((const struct sockaddr_in *) sa)->sin_port, |
| 431 | ((flags & NI_DGRAM) |
| 432 | ? "udp" : "tcp"), &ts, |
| 433 | tmpbuf.data, tmpbuf.length, &s))) |
| 434 | { |
| 435 | if (e == ERANGE) |
| 436 | { |
| 437 | if (!scratch_buffer_grow (&tmpbuf)) |
| 438 | return EAI_MEMORY; |
| 439 | } |
| 440 | else |
| 441 | break; |
| 442 | } |
| 443 | if (s) |
| 444 | { |
| 445 | strncpy (serv, s->s_name, servlen); |
| 446 | break; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | if (__snprintf (serv, servlen, "%d", |
| 451 | ntohs (((const struct sockaddr_in *) sa)->sin_port)) |
| 452 | + 1 > servlen) |
| 453 | return EAI_OVERFLOW; |
| 454 | |
| 455 | break; |
| 456 | |
| 457 | case AF_LOCAL: |
| 458 | strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen); |
| 459 | break; |
| 460 | } |
| 461 | |
| 462 | if (host && (hostlen > 0)) |
| 463 | host[hostlen-1] = 0; |
| 464 | if (serv && (servlen > 0)) |
| 465 | serv[servlen-1] = 0; |
| 466 | errno = serrno; |
| 467 | return 0; |
| 468 | } |
| 469 | libc_hidden_def (getnameinfo) |