summaryrefslogtreecommitdiffstats
path: root/src/include/fake-addrinfo.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/include/fake-addrinfo.c')
-rw-r--r--src/include/fake-addrinfo.c528
1 files changed, 0 insertions, 528 deletions
diff --git a/src/include/fake-addrinfo.c b/src/include/fake-addrinfo.c
deleted file mode 100644
index a2981166d..000000000
--- a/src/include/fake-addrinfo.c
+++ /dev/null
@@ -1,528 +0,0 @@
-/*
- * Copyright (C) 2001,2002 by the Massachusetts Institute of Technology,
- * Cambridge, MA, USA. All Rights Reserved.
- *
- * This software is being provided to you, the LICENSEE, by the
- * Massachusetts Institute of Technology (M.I.T.) under the following
- * license. By obtaining, using and/or copying this software, you agree
- * that you have read, understood, and will comply with these terms and
- * conditions:
- *
- * Export of this software from the United States of America may
- * require a specific license from the United States Government.
- * It is the responsibility of any person or organization contemplating
- * export to obtain such a license before exporting.
- *
- * WITHIN THAT CONSTRAINT, permission to use, copy, modify and distribute
- * this software and its documentation for any purpose and without fee or
- * royalty is hereby granted, provided that you agree to comply with the
- * following copyright notice and statements, including the disclaimer, and
- * that the same appear on ALL copies of the software and documentation,
- * including modifications that you make for internal use or for
- * distribution:
- *
- * THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS
- * OR WARRANTIES, EXPRESS OR IMPLIED. By way of example, but not
- * limitation, M.I.T. MAKES NO REPRESENTATIONS OR WARRANTIES OF
- * MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF
- * THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
- * PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
- *
- * The name of the Massachusetts Institute of Technology or M.I.T. may NOT
- * be used in advertising or publicity pertaining to distribution of the
- * software. Title to copyright in this software and any associated
- * documentation shall at all times remain with M.I.T., and USER agrees to
- * preserve same.
- *
- * Furthermore if you modify this software you must label
- * your software as modified software and not distribute it in such a
- * fashion that it might be confused with the original M.I.T. software.
- */
-
-/* To do, maybe:
-
- + For AIX 4.3.3, using the RFC 2133 definition: Implement
- AI_NUMERICHOST. It's not defined in the header file.
-
- For certain (old?) versions of GNU libc, AI_NUMERICHOST is
- defined but not implemented.
-
- + Windows support.
-
- Apparently XP and .Net provide getaddrinfo and friends, but
- earlier versions do not. Since we want one binary to work on
- multiple platforms, the best option appears to be to use the OS
- version if it's available, and the fake one here otherwise. This
- means both the wrapper and the fake versions need to be compiled,
- and they need to use the OS version of structures and macros.
-
- Try defining NEED_FAKE_GETADDRINFO and WRAP_GETADDRINFO but not
- HAVE_FAKE_GETADDRINFO, and put in the right magic to look up the
- function addresses at run time.
-
- + Use gethostbyname2, inet_aton and other IPv6 or thread-safe
- functions if available. But, see
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=135182 for one
- gethostbyname2 problem on Linux.
-
- + Upgrade host requirements to include working implementations of
- these functions, and throw all this away. :-) */
-
-#include "fake-addrinfo.h"
-
-#if !defined(_XOPEN_SOURCE_EXTENDED) && !defined(HAVE_MACSOCK_H) && !defined(_WIN32)
-/* Hack for HPUX, to get h_errno. */
-# define _XOPEN_SOURCE_EXTENDED 1
-# include <netdb.h>
-# undef _XOPEN_SOURCE_EXTENDED
-#endif
-
-#ifdef HAVE_FAKE_GETADDRINFO
-#define NEED_FAKE_GETADDRINFO
-#endif
-
-#ifdef NEED_FAKE_GETADDRINFO
-
-static int translate_h_errno (int h);
-
-static int fai_add_entry (struct addrinfo **result, void *addr, int port,
- const struct addrinfo *template)
-{
- struct addrinfo *n = malloc (sizeof (struct addrinfo));
- struct sockaddr_in *sin4;
- if (n == 0)
- return EAI_MEMORY;
- if (template->ai_family != AF_INET)
- return EAI_FAMILY;
- *n = *template;
- sin4 = malloc (sizeof (struct sockaddr_in));
- if (sin4 == 0)
- return EAI_MEMORY;
- n->ai_addr = (struct sockaddr *) sin4;
- sin4->sin_family = AF_INET;
- sin4->sin_addr = *(struct in_addr *)addr;
- sin4->sin_port = port;
-#ifdef HAVE_SA_LEN
- sin4->sin_len = sizeof (struct sockaddr_in);
-#endif
- n->ai_next = *result;
- *result = n;
- return 0;
-}
-
-static int fai_add_hosts_by_name (const char *name, int af,
- struct addrinfo *template,
- int portnum, int flags,
- struct addrinfo **result)
-{
- struct hostent *hp;
- int i, r;
-
- if (af != AF_INET)
- /* For now, real ipv6 support needs real getaddrinfo. */
- return EAI_FAMILY;
- hp = gethostbyname (name);
- if (hp == 0)
- return translate_h_errno (h_errno);
- for (i = 0; hp->h_addr_list[i]; i++) {
- r = fai_add_entry (result, hp->h_addr_list[i], portnum, template);
- if (r)
- return r;
- }
- if (*result && (flags & AI_CANONNAME))
- (*result)->ai_canonname = strdup (hp->h_name);
- return 0;
-}
-
-static int
-fake_getaddrinfo (const char *name, const char *serv,
- const struct addrinfo *hint, struct addrinfo **result)
-{
- struct addrinfo *res = 0;
- int ret;
- int port = 0, socktype;
- int flags;
- struct addrinfo template;
-
- if (hint != 0) {
- if (hint->ai_family != 0 && hint->ai_family != AF_INET)
- return EAI_NODATA;
- socktype = hint->ai_socktype;
- flags = hint->ai_flags;
- } else {
- socktype = 0;
- flags = 0;
- }
-
- if (serv) {
- size_t numlen = strspn (serv, "0123456789");
- if (serv[numlen] == '\0') {
- /* pure numeric */
- unsigned long p = strtoul (serv, 0, 10);
- if (p == 0 || p > 65535)
- return EAI_NONAME;
- port = htons (p);
- } else {
- struct servent *sp;
- int try_dgram_too = 0;
- if (socktype == 0) {
- try_dgram_too = 1;
- socktype = SOCK_STREAM;
- }
- try_service_lookup:
- sp = getservbyname (serv, socktype == SOCK_STREAM ? "tcp" : "udp");
- if (sp == 0) {
- if (try_dgram_too) {
- socktype = SOCK_DGRAM;
- goto try_service_lookup;
- }
- return EAI_SERVICE;
- }
- port = sp->s_port;
- }
- }
-
- if (name == 0) {
- name = (flags & AI_PASSIVE) ? "0.0.0.0" : "127.0.0.1";
- flags |= AI_NUMERICHOST;
- }
-
- template.ai_family = AF_INET;
- template.ai_addrlen = sizeof (struct sockaddr_in);
- template.ai_socktype = socktype;
- template.ai_protocol = 0;
- template.ai_flags = 0;
- template.ai_canonname = 0;
- template.ai_next = 0;
- template.ai_addr = 0;
-
- /* If NUMERICHOST is set, parse a numeric address.
- If it's not set, don't accept such names. */
- if (flags & AI_NUMERICHOST) {
- struct in_addr addr4;
-#if 0
- ret = inet_aton (name, &addr4);
- if (ret)
- return EAI_NONAME;
-#else
- addr4.s_addr = inet_addr (name);
- if (addr4.s_addr == 0xffffffff || addr4.s_addr == -1)
- /* 255.255.255.255 or parse error, both bad */
- return EAI_NONAME;
-#endif
- ret = fai_add_entry (&res, &addr4, port, &template);
- } else {
- ret = fai_add_hosts_by_name (name, AF_INET, &template, port, flags,
- &res);
- }
-
- if (ret && ret != NO_ADDRESS) {
- freeaddrinfo (res);
- return ret;
- }
- if (res == 0)
- return NO_ADDRESS;
- *result = res;
- return 0;
-}
-
-static int
-fake_getnameinfo (const struct sockaddr *sa, socklen_t len,
- char *host, size_t hostlen,
- char *service, size_t servicelen,
- int flags)
-{
- struct hostent *hp;
- const struct sockaddr_in *sinp;
- struct servent *sp;
-
- if (sa->sa_family != AF_INET) {
- return EAI_FAMILY;
- }
- sinp = (const struct sockaddr_in *) sa;
-
- if (host) {
- if (flags & NI_NUMERICHOST) {
- char *p;
- numeric_host:
- p = inet_ntoa (sinp->sin_addr);
- strncpy (host, p, hostlen);
- } else {
- hp = gethostbyaddr ((const char *) &sinp->sin_addr,
- sizeof (struct in_addr),
- sa->sa_family);
- if (hp == 0) {
- if (h_errno == NO_ADDRESS && !(flags & NI_NAMEREQD)) /* ??? */
- goto numeric_host;
- return translate_h_errno (h_errno);
- }
- /* According to the Open Group spec, getnameinfo can
- silently truncate, but must still return a
- null-terminated string. */
- strncpy (host, hp->h_name, hostlen);
- }
- host[hostlen-1] = 0;
- }
-
- if (service) {
- if (flags & NI_NUMERICSERV) {
- char numbuf[10];
- int port;
- numeric_service:
- port = ntohs (sinp->sin_port);
- if (port < 0 || port > 65535)
- return EAI_FAIL;
- sprintf (numbuf, "%d", port);
- strncpy (service, numbuf, servicelen);
- } else {
- sp = getservbyport (sinp->sin_port,
- (flags & NI_DGRAM) ? "udp" : "tcp");
- if (sp == 0)
- goto numeric_service;
- strncpy (service, sp->s_name, servicelen);
- }
- service[servicelen-1] = 0;
- }
-
- return 0;
-}
-
-static void
-fake_freeaddrinfo (struct addrinfo *ai)
-{
- struct addrinfo *next;
- while (ai) {
- next = ai->ai_next;
- if (ai->ai_canonname)
- free (ai->ai_canonname);
- if (ai->ai_addr)
- free (ai->ai_addr);
- free (ai);
- ai = next;
- }
-}
-
-char *gai_strerror (int code)
-{
- switch (code) {
- case EAI_ADDRFAMILY: return "address family for nodename not supported";
- case EAI_AGAIN: return "temporary failure in name resolution";
- case EAI_BADFLAGS: return "bad flags to getaddrinfo/getnameinfo";
- case EAI_FAIL: return "non-recoverable failure in name resolution";
- case EAI_FAMILY: return "ai_family not supported";
- case EAI_MEMORY: return "out of memory";
- case EAI_NODATA: return "no address associated with hostname";
- case EAI_NONAME: return "name does not exist";
- case EAI_SERVICE: return "service name not supported for specified socket type";
- case EAI_SOCKTYPE: return "ai_socktype not supported";
- case EAI_SYSTEM: return strerror (errno);
- default: return "bogus getaddrinfo error?";
- }
-}
-
-static int translate_h_errno (int h)
-{
- switch (h) {
- case 0:
- return 0;
-#ifdef NETDB_INTERNAL
- case NETDB_INTERNAL:
- if (errno == ENOMEM)
- return EAI_MEMORY;
- return EAI_SYSTEM;
-#endif
- case HOST_NOT_FOUND:
- return EAI_NONAME;
- case TRY_AGAIN:
- return EAI_AGAIN;
- case NO_RECOVERY:
- return EAI_FAIL;
- case NO_DATA:
-#if NO_DATA != NO_ADDRESS
- case NO_ADDRESS:
-#endif
- return EAI_NODATA;
- default:
- return EAI_SYSTEM;
- }
-}
-
-#ifdef HAVE_FAKE_GETADDRINFO
-int getaddrinfo (const char *name, const char *serv,
- const struct addrinfo *hint, struct addrinfo **result)
-{
- return fake_getaddrinfo(name, serv, hint, result);
-}
-
-void freeaddrinfo (struct addrinfo *ai)
-{
- fake_freeaddrinfo(ai);
-}
-
-int getnameinfo (const struct sockaddr *sa, socklen_t len,
- char *host, size_t hostlen,
- char *service, size_t servicelen,
- int flags)
-{
- return fake_getnameinfo(sa, len, host, hostlen, service, servicelen,
- flags);
-}
-#endif /* HAVE_FAKE_GETADDRINFO */
-#endif /* NEED_FAKE_GETADDRINFO */
-
-
-#if defined (WRAP_GETADDRINFO) || defined (WRAP_GETNAMEINFO)
-/* These variables will contain pointers to the system versions. They
- have to be initialized at the end, because the way we initialize
- them (for UNIX) is #undef and a reference to the C library symbol
- name. */
-static int (*gaiptr) (const char *, const char *, const struct addrinfo *,
- struct addrinfo **);
-static void (*faiptr) (struct addrinfo *);
-#ifdef WRAP_GETNAMEINFO
-static int (*gniptr) (const struct sockaddr *, socklen_t,
- char *, size_t, char *, size_t, int);
-#endif
-
-#ifdef WRAP_GETADDRINFO
-
-int
-getaddrinfo (const char *name, const char *serv, const struct addrinfo *hint,
- struct addrinfo **result)
-{
- int aierr;
-
- aierr = (*gaiptr) (name, serv, hint, result);
- if (aierr || *result == 0)
- return aierr;
-
-#ifdef __linux__
- /* Linux libc version 6 (libc-2.2.4.so on Debian) is broken.
-
- RFC 2553 says that when AI_CANONNAME is set, the ai_canonname
- flag of the first returned structure has the canonical name of
- the host. Instead, GNU libc sets ai_canonname in each returned
- structure to the name that the corresponding address maps to,
- if any, or a printable numeric form.
-
- RFC 2553 bis and the new Open Group spec say that field will be
- the canonical name if it can be determined, otherwise, the
- provided hostname or a copy of it.
-
- IMNSHO, "canonical name" means CNAME processing and not PTR
- processing, but I can see arguing it. Using the numeric form
- when that's not the form provided is just wrong. So, let's fix
- it.
-
- The glibc 2.2.5 sources indicate that the canonical name is
- *not* allocated separately, it's just some extra storage tacked
- on the end of the addrinfo structure. So, let's try this
- approach: If getaddrinfo sets ai_canonname, we'll replace the
- *first* one with allocated storage, and free up that pointer in
- freeaddrinfo if it's set; the other ai_canonname fields will be
- left untouched.
-
- Ref: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=133668 .
-
- Since it's dependent on the target hostname, it's hard to check
- for at configure time. Always do it on Linux for now. When
- they get around to fixing it, add a compile-time or run-time
- check for the glibc version in use. */
-#define COPY_FIRST_CANONNAME
- if (name && (hint->ai_flags & AI_CANONNAME)) {
- struct hostent *hp;
- const char *name2 = 0;
- int i;
-
- hp = gethostbyname(name);
- if (hp == 0) {
- if ((*result)->ai_canonname != 0)
- /* XXX Indicate success with the existing name? */
- return 0;
- /* No canonname listed, and gethostbyname failed. */
- name2 = name;
- } else {
- /* Sometimes gethostbyname will be directed to /etc/hosts
- first, and sometimes that file will have entries with
- the unqualified name first. So take the first entry
- that looks like it could be a FQDN. */
- for (i = 0; hp->h_aliases[i]; i++) {
- if (strchr(hp->h_aliases[i], '.') != 0) {
- name2 = hp->h_aliases[i];
- break;
- }
- }
- /* Give up, just use the first name (h_name ==
- h_aliases[0] on all systems I've seen). */
- if (hp->h_aliases[i] == 0)
- name2 = hp->h_name;
- }
-
- (*result)->ai_canonname = strdup(name2);
- if ((*result)->ai_canonname == 0) {
- (*faiptr)(*result);
- *result = 0;
- return EAI_MEMORY;
- }
- }
-#endif
-
-#ifdef _AIX
- for (; ai; ai = ai->ai_next) {
- /* AIX 4.3.3 libc is broken. It doesn't set the family or len
- fields of the sockaddr structures. */
- if (ai->ai_addr->sa_family == 0)
- ai->ai_addr->sa_family = ai->ai_family;
-#ifdef HAVE_SA_LEN /* always true on aix, actually */
- if (ai->ai_addr->sa_len == 0)
- ai->ai_addr->sa_len = ai->ai_addrlen;
-#endif
- }
-#endif
-
- /* Not dealt with yet:
-
- - Some versions of GNU libc can lose some IPv4 addresses in
- certain cases when multiple IPv4 and IPv6 addresses are
- available.
-
- - Wrapping a possibly-missing system version, as we'll need to
- do for Windows. */
-
- return 0;
-}
-
-void freeaddrinfo (struct addrinfo *ai)
-{
-#ifdef COPY_FIRST_CANONNAME
- free(ai->ai_canonname);
- ai->ai_canonname = 0;
- (*faiptr)(ai);
-#else
- (*faiptr)(ai);
-#endif
-}
-#endif /* WRAP_GETADDRINFO */
-
-#ifdef WRAP_GETNAMEINFO
-int getnameinfo (const struct sockaddr *sa, socklen_t len,
- char *host, size_t hostlen,
- char *service, size_t servicelen,
- int flags)
-{
- return (*gniptr)(sa, len, host, hostlen, service, servicelen, flags);
-}
-#endif /* WRAP_GETNAMEINFO */
-
-#undef getaddrinfo
-#undef getnameinfo
-#undef freeaddrinfo
-static int (*gaiptr) (const char *, const char *, const struct addrinfo *,
- struct addrinfo **) = &getaddrinfo;
-static void (*faiptr) (struct addrinfo *) = &freeaddrinfo;
-#ifdef WRAP_GETNAMEINFO
-static int (*gniptr) (const struct sockaddr *, socklen_t,
- char *, size_t, char *, size_t, int) = &getnameinfo;
-#endif
-
-#endif /* WRAP_GETADDRINFO || WRAP_GETNAMEINFO */
generated by cgit (git 2.34.1) at 2025-02-26 10:13:00 +0000