1/*++ 2/* NAME 3/* myaddrinfo 3 4/* SUMMARY 5/* addrinfo encapsulation and emulation 6/* SYNOPSIS 7/* #include <myaddrinfo.h> 8/* 9/* #define MAI_V4ADDR_BITS ... 10/* #define MAI_V6ADDR_BITS ... 11/* #define MAI_V4ADDR_BYTES ... 12/* #define MAI_V6ADDR_BYTES ... 13/* 14/* typedef struct { char buf[....]; } MAI_HOSTNAME_STR; 15/* typedef struct { char buf[....]; } MAI_HOSTADDR_STR; 16/* typedef struct { char buf[....]; } MAI_SERVNAME_STR; 17/* typedef struct { char buf[....]; } MAI_SERVPORT_STR; 18/* 19/* int hostname_to_sockaddr(hostname, service, socktype, result) 20/* const char *hostname; 21/* const char *service; 22/* int socktype; 23/* struct addrinfo **result; 24/* 25/* int hostname_to_sockaddr_pf(hostname, pf, service, socktype, result) 26/* const char *hostname; 27/* int pf; 28/* const char *service; 29/* int socktype; 30/* struct addrinfo **result; 31/* 32/* int hostaddr_to_sockaddr(hostaddr, service, socktype, result) 33/* const char *hostaddr; 34/* const char *service; 35/* int socktype; 36/* struct addrinfo **result; 37/* 38/* int sockaddr_to_hostaddr(sa, salen, hostaddr, portnum, socktype) 39/* const struct sockaddr *sa; 40/* SOCKADDR_SIZE salen; 41/* MAI_HOSTADDR_STR *hostaddr; 42/* MAI_SERVPORT_STR *portnum; 43/* int socktype; 44/* 45/* int sockaddr_to_hostname(sa, salen, hostname, service, socktype) 46/* const struct sockaddr *sa; 47/* SOCKADDR_SIZE salen; 48/* MAI_HOSTNAME_STR *hostname; 49/* MAI_SERVNAME_STR *service; 50/* int socktype; 51/* 52/* const char *MAI_STRERROR(error) 53/* int error; 54/* DESCRIPTION 55/* This module provides a simplified user interface to the 56/* getaddrinfo(3) and getnameinfo(3) routines (which provide 57/* a unified interface to manipulate IPv4 and IPv6 socket 58/* address structures). 59/* 60/* On systems without getaddrinfo(3) and getnameinfo(3) support, 61/* emulation for IPv4 only can be enabled by defining 62/* EMULATE_IPV4_ADDRINFO. 63/* 64/* hostname_to_sockaddr() looks up the binary addresses for 65/* the specified symbolic hostname or numeric address. The 66/* result should be destroyed with freeaddrinfo(). A null host 67/* pointer converts to the null host address. 68/* 69/* hostname_to_sockaddr_pf() is an extended interface that 70/* provides a protocol family override. 71/* 72/* hostaddr_to_sockaddr() converts a printable network address 73/* into the corresponding binary form. The result should be 74/* destroyed with freeaddrinfo(). A null host pointer converts 75/* to the null host address. 76/* 77/* sockaddr_to_hostaddr() converts a binary network address 78/* into printable form. The result buffers should be large 79/* enough to hold the printable address or port including the 80/* null terminator. 81/* This function strips off the IPv6 datalink suffix. 82/* 83/* sockaddr_to_hostname() converts a binary network address 84/* into a hostname or service. The result buffer should be 85/* large enough to hold the hostname or service including the 86/* null terminator. This routine rejects malformed hostnames 87/* or numeric hostnames and pretends that the lookup failed. 88/* 89/* MAI_STRERROR() is an unsafe macro (it evaluates the argument 90/* multiple times) that invokes strerror() or gai_strerror() 91/* as appropriate. 92/* 93/* This module exports the following constants that should be 94/* user for storage allocation of name or address information: 95/* .IP MAI_V4ADDR_BITS 96/* .IP MAI_V6ADDR_BITS 97/* .IP MAI_V4ADDR_BYTES 98/* .IP MAI_V6ADDR_BYTES 99/* The number of bits or bytes needed to store a binary 100/* IPv4 or IPv6 network address. 101/* .PP 102/* The types MAI_HOST{NAME,ADDR}_STR and MAI_SERV{NAME,PORT}_STR 103/* implement buffers for the storage of the string representations 104/* of symbolic or numerical hosts or services. Do not use 105/* buffer types other than the ones that are expected here, 106/* or things will blow up with buffer overflow problems. 107/* 108/* Arguments: 109/* .IP hostname 110/* On input to hostname_to_sockaddr(), a numeric or symbolic 111/* hostname, or a null pointer (meaning the wild-card listen 112/* address). On output from sockaddr_to_hostname(), storage 113/* for the result hostname, or a null pointer. 114/* .IP pf 115/* Protocol type: PF_UNSPEC (meaning: use any protocol that is 116/* available), PF_INET, or PF_INET6. This argument is ignored 117/* in EMULATE_IPV4_ADDRINFO mode. 118/* .IP hostaddr 119/* On input to hostaddr_to_sockaddr(), a numeric hostname, 120/* or a null pointer (meaning the wild-card listen address). 121/* On output from sockaddr_to_hostaddr(), storage for the 122/* result hostaddress, or a null pointer. 123/* .IP service 124/* On input to hostname/addr_to_sockaddr(), a numeric or 125/* symbolic service name, or a null pointer in which case the 126/* socktype argument is ignored. On output from 127/* sockaddr_to_hostname/addr(), storage for the result service 128/* name, or a null pointer. 129/* .IP portnum 130/* Storage for the result service port number, or a null pointer. 131/* .IP socktype 132/* Socket type: SOCK_STREAM, SOCK_DGRAM, etc. This argument is 133/* ignored when no service or port are specified. 134/* .IP sa 135/* Protocol-independent socket address structure. 136/* .IP salen 137/* Protocol-dependent socket address structure size in bytes. 138/* SEE ALSO 139/* getaddrinfo(3), getnameinfo(3), freeaddrinfo(3), gai_strerror(3) 140/* DIAGNOSTICS 141/* All routines either return 0 upon success, or an error code 142/* that is compatible with gai_strerror(). 143/* 144/* On systems where addrinfo support is emulated by Postfix, 145/* some out-of-memory errors are not reported to the caller, 146/* but are handled by mymalloc(). 147/* BUGS 148/* The IPv4-only emulation code does not support requests that 149/* specify a service but no socket type. It returns an error 150/* indication, instead of enumerating all the possible answers. 151/* 152/* The hostname/addr_to_sockaddr() routines should accept a 153/* list of address families that the caller is interested in, 154/* and they should return only information of those types. 155/* 156/* Unfortunately, it is not possible to remove unwanted address 157/* family results from hostname_to_sockaddr(), because we 158/* don't know how the system library routine getaddrinfo() 159/* allocates memory. For example, getaddrinfo() could save 160/* space by referencing the same string object from multiple 161/* addrinfo structures; or it could allocate a string object 162/* and the addrinfo structure as one memory block. 163/* 164/* We could get around this by copying getaddrinfo() results 165/* to our own private data structures, but that would only 166/* make an already expensive API even more expensive. 167/* 168/* A better workaround is to return a vector of addrinfo 169/* pointers to the elements that contain only the elements 170/* that the caller is interested in. The pointer to the 171/* original getaddrinfo() result can be hidden at the end 172/* after the null terminator, or before the first element. 173/* LICENSE 174/* .ad 175/* .fi 176/* The Secure Mailer license must be distributed with this software. 177/* AUTHOR(S) 178/* Wietse Venema 179/* IBM T.J. Watson Research 180/* P.O. Box 704 181/* Yorktown Heights, NY 10598, USA 182/*--*/ 183 184/* System library. */ 185 186#include <sys_defs.h> 187#include <sys/types.h> 188#include <sys/socket.h> 189#include <netinet/in.h> 190#include <arpa/inet.h> 191#include <netdb.h> 192#include <string.h> 193#include <errno.h> 194#include <stdlib.h> 195#include <stdio.h> /* sprintf() */ 196 197/* Utility library. */ 198 199#include <mymalloc.h> 200#include <valid_hostname.h> 201#include <sock_addr.h> 202#include <stringops.h> 203#include <msg.h> 204#include <inet_proto.h> 205#include <myaddrinfo.h> 206#include <split_at.h> 207 208/* Application-specific. */ 209 210 /* 211 * Use an old trick to save some space: allocate space for two objects in 212 * one. In Postfix we often use this trick for structures that have an array 213 * of things at the end. 214 */ 215struct ipv4addrinfo { 216 struct addrinfo info; 217 struct sockaddr_in sin; 218}; 219 220 /* 221 * When we're not interested in service ports, we must pick a socket type 222 * otherwise getaddrinfo() will give us duplicate results: one set for TCP, 223 * and another set for UDP. For consistency, we'll use the same default 224 * socket type for the results from emulation mode. 225 */ 226#define MAI_SOCKTYPE SOCK_STREAM /* getaddrinfo() query */ 227 228#ifdef EMULATE_IPV4_ADDRINFO 229 230/* clone_ipv4addrinfo - clone ipv4addrinfo structure */ 231 232static struct ipv4addrinfo *clone_ipv4addrinfo(struct ipv4addrinfo * tp) 233{ 234 struct ipv4addrinfo *ip; 235 236 ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip)); 237 *ip = *tp; 238 ip->info.ai_addr = (struct sockaddr *) & (ip->sin); 239 return (ip); 240} 241 242/* init_ipv4addrinfo - initialize an ipv4addrinfo structure */ 243 244static void init_ipv4addrinfo(struct ipv4addrinfo * ip, int socktype) 245{ 246 247 /* 248 * Portability: null pointers aren't necessarily all-zero bits, so we 249 * make explicit assignments to all the pointers that we're aware of. 250 */ 251 memset((char *) ip, 0, sizeof(*ip)); 252 ip->info.ai_family = PF_INET; 253 ip->info.ai_socktype = socktype; 254 ip->info.ai_protocol = 0; /* XXX */ 255 ip->info.ai_addrlen = sizeof(ip->sin); 256 ip->info.ai_canonname = 0; 257 ip->info.ai_addr = (struct sockaddr *) & (ip->sin); 258 ip->info.ai_next = 0; 259 ip->sin.sin_family = AF_INET; 260#ifdef HAS_SA_LEN 261 ip->sin.sin_len = sizeof(ip->sin); 262#endif 263} 264 265/* find_service - translate numeric or symbolic service name */ 266 267static int find_service(const char *service, int socktype) 268{ 269 struct servent *sp; 270 const char *proto; 271 unsigned port; 272 273 if (alldig(service)) { 274 port = atoi(service); 275 return (port < 65536 ? htons(port) : -1); 276 } 277 if (socktype == SOCK_STREAM) { 278 proto = "tcp"; 279 } else if (socktype == SOCK_DGRAM) { 280 proto = "udp"; 281 } else { 282 return (-1); 283 } 284 if ((sp = getservbyname(service, proto)) != 0) { 285 return (sp->s_port); 286 } else { 287 return (-1); 288 } 289} 290 291#endif 292 293/* hostname_to_sockaddr_pf - hostname to binary address form */ 294 295int hostname_to_sockaddr_pf(const char *hostname, int pf, 296 const char *service, int socktype, 297 struct addrinfo ** res) 298{ 299#ifdef EMULATE_IPV4_ADDRINFO 300 301 /* 302 * Emulated getaddrinfo(3) version. 303 */ 304 static struct ipv4addrinfo template; 305 struct ipv4addrinfo *ip; 306 struct ipv4addrinfo *prev; 307 struct in_addr addr; 308 struct hostent *hp; 309 char **name_list; 310 int port; 311 312 /* 313 * Validate the service. 314 */ 315 if (service) { 316 if ((port = find_service(service, socktype)) < 0) 317 return (EAI_SERVICE); 318 } else { 319 port = 0; 320 socktype = MAI_SOCKTYPE; 321 } 322 323 /* 324 * No host means INADDR_ANY. 325 */ 326 if (hostname == 0) { 327 ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip)); 328 init_ipv4addrinfo(ip, socktype); 329 ip->sin.sin_addr.s_addr = INADDR_ANY; 330 ip->sin.sin_port = port; 331 *res = &(ip->info); 332 return (0); 333 } 334 335 /* 336 * Numeric host. 337 */ 338 if (inet_pton(AF_INET, hostname, (void *) &addr) == 1) { 339 ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip)); 340 init_ipv4addrinfo(ip, socktype); 341 ip->sin.sin_addr = addr; 342 ip->sin.sin_port = port; 343 *res = &(ip->info); 344 return (0); 345 } 346 347 /* 348 * Look up the IPv4 address list. 349 */ 350 if ((hp = gethostbyname(hostname)) == 0) 351 return (h_errno == TRY_AGAIN ? EAI_AGAIN : EAI_NODATA); 352 if (hp->h_addrtype != AF_INET 353 || hp->h_length != sizeof(template.sin.sin_addr)) 354 return (EAI_NODATA); 355 356 /* 357 * Initialize the result template. 358 */ 359 if (template.info.ai_addrlen == 0) 360 init_ipv4addrinfo(&template, socktype); 361 362 /* 363 * Copy the address information into an addrinfo structure. 364 */ 365 prev = &template; 366 for (name_list = hp->h_addr_list; name_list[0]; name_list++) { 367 ip = clone_ipv4addrinfo(prev); 368 ip->sin.sin_addr = IN_ADDR(name_list[0]); 369 ip->sin.sin_port = port; 370 if (prev == &template) 371 *res = &(ip->info); 372 else 373 prev->info.ai_next = &(ip->info); 374 prev = ip; 375 } 376 return (0); 377#else 378 379 /* 380 * Native getaddrinfo(3) version. 381 * 382 * XXX Wild-card listener issues. 383 * 384 * With most IPv4 plus IPv6 systems, an IPv6 wild-card listener also listens 385 * on the IPv4 wild-card address. Connections from IPv4 clients appear as 386 * IPv4-in-IPv6 addresses; when Postfix support for IPv4 is turned on, 387 * Postfix automatically maps these embedded addresses to their original 388 * IPv4 form. So everything seems to be fine. 389 * 390 * However, some applications prefer to use separate listener sockets for 391 * IPv4 and IPv6. The Postfix IPv6 patch provided such an example. And 392 * this is where things become tricky. On many systems the IPv6 and IPv4 393 * wild-card listeners cannot coexist. When one is already active, the 394 * other fails with EADDRINUSE. Solaris 9, however, will automagically 395 * "do the right thing" and allow both listeners to coexist. 396 * 397 * Recent systems have the IPV6_V6ONLY feature (RFC 3493), which tells the 398 * system that we really mean IPv6 when we say IPv6. This allows us to 399 * set up separate wild-card listener sockets for IPv4 and IPv6. So 400 * everything seems to be fine again. 401 * 402 * The following workaround disables the wild-card IPv4 listener when 403 * IPV6_V6ONLY is unavailable. This is necessary for some Linux versions, 404 * but is not needed for Solaris 9 (which allows IPv4 and IPv6 wild-card 405 * listeners to coexist). Solaris 10 beta already has IPV6_V6ONLY. 406 * 407 * XXX This workaround obviously breaks if we want to support protocols in 408 * addition to IPv6 and IPv4, but it is needed only until IPv6 409 * implementations catch up with RFC 3493. A nicer fix is to filter the 410 * getaddrinfo() result, and to return a vector of addrinfo pointers to 411 * only those types of elements that the caller has expressed interested 412 * in. 413 * 414 * XXX Vanilla AIX 5.1 getaddrinfo() does not support a null hostname with 415 * AI_PASSIVE. And since we don't know how getaddrinfo() manages its 416 * memory we can't bypass it for this special case, or freeaddrinfo() 417 * might blow up. Instead we turn off IPV6_V6ONLY in inet_listen(), and 418 * supply a protocol-dependent hard-coded string value to getaddrinfo() 419 * below, so that it will convert into the appropriate wild-card address. 420 * 421 * XXX AIX 5.[1-3] getaddrinfo() may return a non-null port when a null 422 * service argument is specified. 423 */ 424 struct addrinfo hints; 425 int err; 426 427 memset((char *) &hints, 0, sizeof(hints)); 428 hints.ai_family = (pf != PF_UNSPEC) ? pf : inet_proto_info()->ai_family; 429 hints.ai_socktype = service ? socktype : MAI_SOCKTYPE; 430 if (!hostname) { 431 hints.ai_flags = AI_PASSIVE; 432#if !defined(IPV6_V6ONLY) || defined(BROKEN_AI_PASSIVE_NULL_HOST) 433 switch (hints.ai_family) { 434 case PF_UNSPEC: 435 hints.ai_family = PF_INET6; 436#ifdef BROKEN_AI_PASSIVE_NULL_HOST 437 case PF_INET6: 438 hostname = "::"; 439 break; 440 case PF_INET: 441 hostname = "0.0.0.0"; 442 break; 443#endif 444 } 445#endif 446 } 447 err = getaddrinfo(hostname, service, &hints, res); 448#if defined(BROKEN_AI_NULL_SERVICE) 449 if (service == 0 && err == 0) { 450 struct addrinfo *r; 451 unsigned short *portp; 452 453 for (r = *res; r != 0; r = r->ai_next) 454 if (*(portp = SOCK_ADDR_PORTP(r->ai_addr)) != 0) 455 *portp = 0; 456 } 457#endif 458 return (err); 459#endif 460} 461 462/* hostaddr_to_sockaddr - printable address to binary address form */ 463 464int hostaddr_to_sockaddr(const char *hostaddr, const char *service, 465 int socktype, struct addrinfo ** res) 466{ 467#ifdef EMULATE_IPV4_ADDRINFO 468 469 /* 470 * Emulated getaddrinfo(3) version. 471 */ 472 struct ipv4addrinfo *ip; 473 struct in_addr addr; 474 int port; 475 476 /* 477 * Validate the service. 478 */ 479 if (service) { 480 if ((port = find_service(service, socktype)) < 0) 481 return (EAI_SERVICE); 482 } else { 483 port = 0; 484 socktype = MAI_SOCKTYPE; 485 } 486 487 /* 488 * No host means INADDR_ANY. 489 */ 490 if (hostaddr == 0) { 491 ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip)); 492 init_ipv4addrinfo(ip, socktype); 493 ip->sin.sin_addr.s_addr = INADDR_ANY; 494 ip->sin.sin_port = port; 495 *res = &(ip->info); 496 return (0); 497 } 498 499 /* 500 * Deal with bad address forms. 501 */ 502 switch (inet_pton(AF_INET, hostaddr, (void *) &addr)) { 503 case 1: /* Success */ 504 break; 505 default: /* Unparsable */ 506 return (EAI_NONAME); 507 case -1: /* See errno */ 508 return (EAI_SYSTEM); 509 } 510 511 /* 512 * Initialize the result structure. 513 */ 514 ip = (struct ipv4addrinfo *) mymalloc(sizeof(*ip)); 515 init_ipv4addrinfo(ip, socktype); 516 517 /* 518 * And copy the result. 519 */ 520 ip->sin.sin_addr = addr; 521 ip->sin.sin_port = port; 522 *res = &(ip->info); 523 524 return (0); 525#else 526 527 /* 528 * Native getaddrinfo(3) version. See comments in hostname_to_sockaddr(). 529 * 530 * XXX Vanilla AIX 5.1 getaddrinfo() returns multiple results when 531 * converting a printable ipv4 or ipv6 address to socket address with 532 * ai_family=PF_UNSPEC, ai_flags=AI_NUMERICHOST, ai_socktype=SOCK_STREAM, 533 * ai_protocol=0 or IPPROTO_TCP, and service=0. The workaround is to 534 * ignore all but the first result. 535 * 536 * XXX AIX 5.[1-3] getaddrinfo() may return a non-null port when a null 537 * service argument is specified. 538 */ 539 struct addrinfo hints; 540 int err; 541 542 memset(&hints, 0, sizeof(hints)); 543 hints.ai_family = inet_proto_info()->ai_family; 544 hints.ai_socktype = service ? socktype : MAI_SOCKTYPE; 545 hints.ai_flags = AI_NUMERICHOST; 546 if (!hostaddr) { 547 hints.ai_flags |= AI_PASSIVE; 548#if !defined(IPV6_V6ONLY) || defined(BROKEN_AI_PASSIVE_NULL_HOST) 549 switch (hints.ai_family) { 550 case PF_UNSPEC: 551 hints.ai_family = PF_INET6; 552#ifdef BROKEN_AI_PASSIVE_NULL_HOST 553 case PF_INET6: 554 hostaddr = "::"; 555 break; 556 case PF_INET: 557 hostaddr = "0.0.0.0"; 558 break; 559#endif 560 } 561#endif 562 } 563 err = getaddrinfo(hostaddr, service, &hints, res); 564#if defined(BROKEN_AI_NULL_SERVICE) 565 if (service == 0 && err == 0) { 566 struct addrinfo *r; 567 unsigned short *portp; 568 569 for (r = *res; r != 0; r = r->ai_next) 570 if (*(portp = SOCK_ADDR_PORTP(r->ai_addr)) != 0) 571 *portp = 0; 572 } 573#endif 574 return (err); 575#endif 576} 577 578/* sockaddr_to_hostaddr - binary address to printable address form */ 579 580int sockaddr_to_hostaddr(const struct sockaddr * sa, SOCKADDR_SIZE salen, 581 MAI_HOSTADDR_STR *hostaddr, 582 MAI_SERVPORT_STR *portnum, 583 int unused_socktype) 584{ 585#ifdef EMULATE_IPV4_ADDRINFO 586 char portbuf[sizeof("65535")]; 587 ssize_t len; 588 589 /* 590 * Emulated getnameinfo(3) version. The buffer length includes the space 591 * for the null terminator. 592 */ 593 if (sa->sa_family != AF_INET) { 594 errno = EAFNOSUPPORT; 595 return (EAI_SYSTEM); 596 } 597 if (hostaddr != 0) { 598 if (inet_ntop(AF_INET, (void *) &(SOCK_ADDR_IN_ADDR(sa)), 599 hostaddr->buf, sizeof(hostaddr->buf)) == 0) 600 return (EAI_SYSTEM); 601 } 602 if (portnum != 0) { 603 sprintf(portbuf, "%d", ntohs(SOCK_ADDR_IN_PORT(sa)) & 0xffff); 604 if ((len = strlen(portbuf)) >= sizeof(portnum->buf)) { 605 errno = ENOSPC; 606 return (EAI_SYSTEM); 607 } 608 memcpy(portnum->buf, portbuf, len + 1); 609 } 610 return (0); 611#else 612 int ret; 613 614 /* 615 * Native getnameinfo(3) version. 616 */ 617 ret = getnameinfo(sa, salen, 618 hostaddr ? hostaddr->buf : (char *) 0, 619 hostaddr ? sizeof(hostaddr->buf) : 0, 620 portnum ? portnum->buf : (char *) 0, 621 portnum ? sizeof(portnum->buf) : 0, 622 NI_NUMERICHOST | NI_NUMERICSERV); 623 if (hostaddr != 0 && ret == 0 && sa->sa_family == AF_INET6) 624 (void) split_at(hostaddr->buf, '%'); 625 return (ret); 626#endif 627} 628 629/* sockaddr_to_hostname - binary address to printable hostname */ 630 631int sockaddr_to_hostname(const struct sockaddr * sa, SOCKADDR_SIZE salen, 632 MAI_HOSTNAME_STR *hostname, 633 MAI_SERVNAME_STR *service, 634 int socktype) 635{ 636#ifdef EMULATE_IPV4_ADDRINFO 637 638 /* 639 * Emulated getnameinfo(3) version. 640 */ 641 struct hostent *hp; 642 struct servent *sp; 643 size_t len; 644 645 /* 646 * Sanity check. 647 */ 648 if (sa->sa_family != AF_INET) 649 return (EAI_NODATA); 650 651 /* 652 * Look up the host name. 653 */ 654 if (hostname != 0) { 655 if ((hp = gethostbyaddr((char *) &(SOCK_ADDR_IN_ADDR(sa)), 656 sizeof(SOCK_ADDR_IN_ADDR(sa)), 657 AF_INET)) == 0) 658 return (h_errno == TRY_AGAIN ? EAI_AGAIN : EAI_NONAME); 659 660 /* 661 * Save the result. The buffer length includes the space for the null 662 * terminator. Hostname sanity checks are at the end of this 663 * function. 664 */ 665 if ((len = strlen(hp->h_name)) >= sizeof(hostname->buf)) { 666 errno = ENOSPC; 667 return (EAI_SYSTEM); 668 } 669 memcpy(hostname->buf, hp->h_name, len + 1); 670 } 671 672 /* 673 * Look up the service. 674 */ 675 if (service != 0) { 676 if ((sp = getservbyport(ntohs(SOCK_ADDR_IN_PORT(sa)), 677 socktype == SOCK_DGRAM ? "udp" : "tcp")) == 0) 678 return (EAI_NONAME); 679 680 /* 681 * Save the result. The buffer length includes the space for the null 682 * terminator. 683 */ 684 if ((len = strlen(sp->s_name)) >= sizeof(service->buf)) { 685 errno = ENOSPC; 686 return (EAI_SYSTEM); 687 } 688 memcpy(service->buf, sp->s_name, len + 1); 689 } 690#else 691 692 /* 693 * Native getnameinfo(3) version. 694 */ 695 int err; 696 697 err = getnameinfo(sa, salen, 698 hostname ? hostname->buf : (char *) 0, 699 hostname ? sizeof(hostname->buf) : 0, 700 service ? service->buf : (char *) 0, 701 service ? sizeof(service->buf) : 0, 702 socktype == SOCK_DGRAM ? 703 NI_NAMEREQD | NI_DGRAM : NI_NAMEREQD); 704 if (err != 0) 705 return (err); 706#endif 707 708 /* 709 * Hostname sanity checks. 710 */ 711 if (hostname != 0) { 712 if (valid_hostaddr(hostname->buf, DONT_GRIPE)) { 713 msg_warn("numeric hostname: %s", hostname->buf); 714 return (EAI_NONAME); 715 } 716 if (!valid_hostname(hostname->buf, DO_GRIPE)) 717 return (EAI_NONAME); 718 } 719 return (0); 720} 721 722/* myaddrinfo_control - fine control */ 723 724void myaddrinfo_control(int name,...) 725{ 726 const char *myname = "myaddrinfo_control"; 727 va_list ap; 728 729 for (va_start(ap, name); name != 0; name = va_arg(ap, int)) { 730 switch (name) { 731 default: 732 msg_panic("%s: bad name %d", myname, name); 733 } 734 } 735 va_end(ap); 736} 737 738#ifdef EMULATE_IPV4_ADDRINFO 739 740/* freeaddrinfo - release storage */ 741 742void freeaddrinfo(struct addrinfo * ai) 743{ 744 struct addrinfo *ap; 745 struct addrinfo *next; 746 747 /* 748 * Artefact of implementation: tolerate a null pointer argument. 749 */ 750 for (ap = ai; ap != 0; ap = next) { 751 next = ap->ai_next; 752 if (ap->ai_canonname) 753 myfree(ap->ai_canonname); 754 /* ap->ai_addr is allocated within this memory block */ 755 myfree((char *) ap); 756 } 757} 758 759static char *ai_errlist[] = { 760 "Success", 761 "Address family for hostname not supported", /* EAI_ADDRFAMILY */ 762 "Temporary failure in name resolution", /* EAI_AGAIN */ 763 "Invalid value for ai_flags", /* EAI_BADFLAGS */ 764 "Non-recoverable failure in name resolution", /* EAI_FAIL */ 765 "ai_family not supported", /* EAI_FAMILY */ 766 "Memory allocation failure", /* EAI_MEMORY */ 767 "No address associated with hostname", /* EAI_NODATA */ 768 "hostname nor servname provided, or not known", /* EAI_NONAME */ 769 "service name not supported for ai_socktype", /* EAI_SERVICE */ 770 "ai_socktype not supported", /* EAI_SOCKTYPE */ 771 "System error returned in errno", /* EAI_SYSTEM */ 772 "Invalid value for hints", /* EAI_BADHINTS */ 773 "Resolved protocol is unknown", /* EAI_PROTOCOL */ 774 "Unknown error", /* EAI_MAX */ 775}; 776 777/* gai_strerror - error number to string */ 778 779char *gai_strerror(int ecode) 780{ 781 782 /* 783 * Note: EAI_SYSTEM errors are not automatically handed over to 784 * strerror(). The application decides. 785 */ 786 if (ecode < 0 || ecode > EAI_MAX) 787 ecode = EAI_MAX; 788 return (ai_errlist[ecode]); 789} 790 791#endif 792 793#ifdef TEST 794 795 /* 796 * A test program that takes some info from the command line and runs it 797 * forward and backward through the above conversion routines. 798 */ 799#include <msg.h> 800#include <vstream.h> 801#include <msg_vstream.h> 802 803int main(int argc, char **argv) 804{ 805 struct addrinfo *info; 806 struct addrinfo *ip; 807 MAI_HOSTNAME_STR host; 808 MAI_HOSTADDR_STR addr; 809 int err; 810 811 msg_vstream_init(argv[0], VSTREAM_ERR); 812 813 if (argc != 4) 814 msg_fatal("usage: %s protocols hostname hostaddress", argv[0]); 815 816 inet_proto_init(argv[0], argv[1]); 817 818 msg_info("=== hostname %s ===", argv[2]); 819 820 if ((err = hostname_to_sockaddr(argv[2], (char *) 0, 0, &info)) != 0) { 821 msg_info("hostname_to_sockaddr(%s): %s", 822 argv[2], err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err)); 823 } else { 824 for (ip = info; ip != 0; ip = ip->ai_next) { 825 if ((err = sockaddr_to_hostaddr(ip->ai_addr, ip->ai_addrlen, &addr, 826 (MAI_SERVPORT_STR *) 0, 0)) != 0) { 827 msg_info("sockaddr_to_hostaddr: %s", 828 err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err)); 829 continue; 830 } 831 msg_info("%s -> family=%d sock=%d proto=%d %s", argv[2], 832 ip->ai_family, ip->ai_socktype, ip->ai_protocol, addr.buf); 833 if ((err = sockaddr_to_hostname(ip->ai_addr, ip->ai_addrlen, &host, 834 (MAI_SERVNAME_STR *) 0, 0)) != 0) { 835 msg_info("sockaddr_to_hostname: %s", 836 err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err)); 837 continue; 838 } 839 msg_info("%s -> %s", addr.buf, host.buf); 840 } 841 freeaddrinfo(info); 842 } 843 844 msg_info("=== host address %s ===", argv[3]); 845 846 if ((err = hostaddr_to_sockaddr(argv[3], (char *) 0, 0, &ip)) != 0) { 847 msg_info("hostaddr_to_sockaddr(%s): %s", 848 argv[3], err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err)); 849 } else { 850 if ((err = sockaddr_to_hostaddr(ip->ai_addr, ip->ai_addrlen, &addr, 851 (MAI_SERVPORT_STR *) 0, 0)) != 0) { 852 msg_info("sockaddr_to_hostaddr: %s", 853 err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err)); 854 } else { 855 msg_info("%s -> family=%d sock=%d proto=%d %s", argv[3], 856 ip->ai_family, ip->ai_socktype, ip->ai_protocol, addr.buf); 857 if ((err = sockaddr_to_hostname(ip->ai_addr, ip->ai_addrlen, &host, 858 (MAI_SERVNAME_STR *) 0, 0)) != 0) { 859 msg_info("sockaddr_to_hostname: %s", 860 err == EAI_SYSTEM ? strerror(errno) : gai_strerror(err)); 861 } else 862 msg_info("%s -> %s", addr.buf, host.buf); 863 freeaddrinfo(ip); 864 } 865 } 866 exit(0); 867} 868 869#endif 870