зеркало из https://github.com/github/putty.git
Jeroen Massar's IPv6 patch. Disabled by default, for now.
[originally from svn r849]
This commit is contained in:
Simon Tatham
Родитель
170a75b520
Коммит
c57d524298
246
winnet.c
246
winnet.c
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@ -1,9 +1,51 @@
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/*
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* Windows networking abstraction.
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*
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* Due to this clean abstraction it was possible
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* to easily implement IPv6 support :)
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*
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* IPv6 patch 1 (27 October 2000) Jeroen Massar <jeroen@unfix.org>
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* - Preliminary hacked IPv6 support.
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* - Connecting to IPv6 address (eg fec0:4242:4242:100:2d0:b7ff:fe8f:5d42) works.
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* - Connecting to IPv6 hostname (eg heaven.ipv6.unfix.org) works.
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* - Compiles as either IPv4 or IPv6.
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*
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* IPv6 patch 2 (29 October 2000) Jeroen Massar <jeroen@unfix.org>
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* - When compiled as IPv6 it also allows connecting to IPv4 hosts.
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* - Added some more documentation.
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*
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* IPv6 patch 3 (18 November 2000) Jeroen Massar <jeroen@unfix.org>
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* - It now supports dynamically loading the IPv6 resolver dll's.
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* This way we should be able to distribute one (1) binary
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* which supports both IPv4 and IPv6.
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* - getaddrinfo() and getnameinfo() are loaded dynamicaly if possible.
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* - in6addr_any is defined in this file so we don't need to link to wship6.lib
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* - The patch is now more unified so that we can still
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* remove all IPv6 support by undef'ing IPV6.
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* But where it fallsback to IPv4 it uses the IPv4 code which is already in place...
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* - Canonical name resolving works.
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*
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* IPv6 patch 4 (07 January 2001) Jeroen Massar <jeroen@unfix.org>
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* - patch against CVS of today, will be submitted to the bugs list
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* as a 'cvs diff -u' on Simon's request...
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*
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*/
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#include <windows.h>
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/*
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* Define IPV6 to have IPv6 on-the-fly-loading support.
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* This means that one doesn't have to have an IPv6 stack to use it.
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* But if an IPv6 stack is found it is used with a fallback to IPv4.
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*/
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/* #define IPV6 1 */
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#ifdef IPV6
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#include <tpipv6.h>
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#else
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#include <winsock.h>
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#endif
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -25,7 +67,17 @@ struct Socket_tag {
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struct SockAddr_tag {
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char *error;
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unsigned long address;
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/* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
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int family;
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unsigned long address; /* Address IPv4 style. */
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#ifdef IPV6
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struct addrinfo *ai; /* Address IPv6 style. */
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#endif
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/*
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* We need to have this lengthy enough to hold *any* hostname
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* (including IPv6 reverse...)
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*/
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char realhost[8192];
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};
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struct buffer {
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@ -97,25 +149,133 @@ char *winsock_error_string(int error) {
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}
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}
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SockAddr sk_namelookup(char *host, char **canonicalname) {
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SockAddr sk_namelookup(char *host, char **canonicalname)
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{
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SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
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unsigned long a;
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struct hostent *h;
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struct hostent *h = NULL;
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ret->error = NULL;
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if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
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if ( (h = gethostbyname(host)) == NULL) {
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DWORD err = WSAGetLastError();
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ret->error = winsock_error_string(err);
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} else {
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memcpy (&a, h->h_addr, sizeof(a));
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*canonicalname = h->h_name;
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/* Clear the structure and default to IPv4. */
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memset(ret, 0, sizeof(struct SockAddr_tag));
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ret->family = 0; /* We set this one when we have resolved the host. */
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*canonicalname = ret->realhost; /* This makes sure we always have a hostname to return. */
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if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE)
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{
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#ifdef IPV6
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/* Try to get the getaddrinfo() function from wship6.dll */
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/* This way one doesn't need to have IPv6 dll's to use PuTTY and
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* it will fallback to IPv4. */
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typedef int (CALLBACK* FGETADDRINFO)(const char *nodename,
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const char *servname,
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const struct addrinfo *hints,
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struct addrinfo **res);
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FGETADDRINFO fGetAddrInfo = NULL;
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HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll");
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if (dllWSHIP6)
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fGetAddrInfo = (FGETADDRINFO)GetProcAddress(dllWSHIP6,
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"getaddrinfo");
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/*
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* Use fGetAddrInfo when it's available (which usually also
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* means IPv6 is installed...)
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*/
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if (fGetAddrInfo)
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{
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/*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
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if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0)
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ret->family = ret->ai->ai_family;
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}
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} else {
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else
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#endif
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/*
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* Otherwise use the IPv4-only gethostbyname...
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* (NOTE: we don't use gethostbyname as a
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* fallback!)
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*/
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if (ret->family == 0)
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{
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/*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
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if (h = gethostbyname(host)) ret->family = AF_INET;
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}
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/*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
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if (ret->family == 0)
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{
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DWORD err = WSAGetLastError();
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ret->error = (err == WSAENETDOWN ? "Network is down" :
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err == WSAHOST_NOT_FOUND ? "Host does not exist" :
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err == WSATRY_AGAIN ? "Host not found" :
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#ifdef IPV6
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fGetAddrInfo ? "getaddrinfo: unknown error" :
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#endif
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"gethostbyname: unknown error");
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#ifdef DEBUG
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{
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LPVOID lpMsgBuf;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&lpMsgBuf, 0, NULL);
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debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h));
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/* Free the buffer. */
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LocalFree(lpMsgBuf);
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}
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#endif
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}
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else
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{
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ret->error = NULL;
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#ifdef IPV6
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/* If we got an address info use that... */
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if (ret->ai)
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{
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typedef int (CALLBACK* FGETNAMEINFO)
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(const struct sockaddr FAR *sa, socklen_t salen,
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char FAR * host, size_t hostlen, char FAR * serv,
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size_t servlen, int flags);
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FGETNAMEINFO fGetNameInfo = NULL;
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/* Are we in IPv4 fallback mode? */
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/* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
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if (ret->family == AF_INET)
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memcpy(&a, (char *)&((SOCKADDR_IN *)ret->ai->ai_addr)->sin_addr, sizeof(a));
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/* Now let's find that canonicalname... */
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if ((dllWSHIP6) && (fGetNameInfo = (FGETNAMEINFO)GetProcAddress(dllWSHIP6, "getnameinfo")))
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{
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if (fGetNameInfo((struct sockaddr *)ret->ai->ai_addr,
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ret->family == AF_INET ?
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sizeof(SOCKADDR_IN) :
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sizeof(SOCKADDR_IN6), ret->realhost,
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sizeof(ret->realhost), NULL,
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0, 0) != 0)
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{
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strncpy(ret->realhost, host,
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sizeof(ret->realhost));
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}
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}
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}
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/* We used the IPv4-only gethostbyname()... */
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else
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{
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#endif
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memcpy(&a, h->h_addr, sizeof(a));
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/* This way we are always sure the h->h_name is valid :) */
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strncpy(ret->realhost, h->h_name, sizeof(ret->realhost));
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#ifdef IPV6
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}
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#endif
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}
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#ifdef IPV6
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FreeLibrary(dllWSHIP6);
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#endif
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}
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else
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{
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*canonicalname = host;
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}
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ret->address = ntohl(a);
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return ret;
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}
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@ -125,6 +285,9 @@ void sk_addr_free(SockAddr addr) {
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Socket sk_new(SockAddr addr, int port, sk_receiver_t receiver) {
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SOCKET s;
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#ifdef IPV6
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SOCKADDR_IN6 a6;
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#endif
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SOCKADDR_IN a;
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DWORD err;
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char *errstr;
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@ -145,7 +308,7 @@ Socket sk_new(SockAddr addr, int port, sk_receiver_t receiver) {
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/*
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* Open socket.
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*/
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s = socket(AF_INET, SOCK_STREAM, 0);
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s = socket(addr->family, SOCK_STREAM, 0);
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ret->s = s;
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if (s == INVALID_SOCKET) {
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@ -157,23 +320,58 @@ Socket sk_new(SockAddr addr, int port, sk_receiver_t receiver) {
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/*
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* Bind to local address.
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*/
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a.sin_family = AF_INET;
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a.sin_addr.s_addr = htonl(INADDR_ANY);
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a.sin_port = htons(0);
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if (bind (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) {
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#ifdef IPV6
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if (addr->family == AF_INET6)
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{
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memset(&a6,0,sizeof(a6));
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a6.sin6_family = AF_INET6;
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/*a6.sin6_addr = in6addr_any;*/ /* == 0 */
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a6.sin6_port = htons(0);
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}
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else
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{
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#endif
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a.sin_family = AF_INET;
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a.sin_addr.s_addr = htonl(INADDR_ANY);
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a.sin_port = htons(0);
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#ifdef IPV6
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}
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if (bind (s, (addr->family == AF_INET6) ? (struct sockaddr *)&a6 : (struct sockaddr *)&a, (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) == SOCKET_ERROR)
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#else
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if (bind (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR)
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#endif
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{
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err = WSAGetLastError();
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ret->error = winsock_error_string(err);
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ret->error = winsock_error_string(err);
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return ret;
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}
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/*
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* Connect to remote address.
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*/
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a.sin_addr.s_addr = htonl(addr->address);
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a.sin_port = htons((short)port);
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if (connect (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) {
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#ifdef IPV6
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if (addr->family == AF_INET6)
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{
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memset(&a,0,sizeof(a));
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a6.sin6_family = AF_INET6;
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a6.sin6_port = htons((short)port);
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a6.sin6_addr = ((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr;
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}
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else
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{
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#endif
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a.sin_family = AF_INET;
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a.sin_addr.s_addr = htonl(addr->address);
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a.sin_port = htons((short)port);
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#ifdef IPV6
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}
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if (connect (s, (addr->family == AF_INET6) ? (struct sockaddr *)&a6 : (struct sockaddr *)&a, (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) == SOCKET_ERROR)
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#else
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if (connect (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR)
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#endif
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{
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err = WSAGetLastError();
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ret->error = winsock_error_string(err);
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ret->error = winsock_error_string(err);
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return ret;
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}
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