/*
* Windows networking abstraction.
+ *
+ * Due to this clean abstraction it was possible
+ * to easily implement IPv6 support :)
+ *
+ * IPv6 patch 1 (27 October 2000) Jeroen Massar <jeroen@unfix.org>
+ * - Preliminary hacked IPv6 support.
+ * - Connecting to IPv6 address (eg fec0:4242:4242:100:2d0:b7ff:fe8f:5d42) works.
+ * - Connecting to IPv6 hostname (eg heaven.ipv6.unfix.org) works.
+ * - Compiles as either IPv4 or IPv6.
+ *
+ * IPv6 patch 2 (29 October 2000) Jeroen Massar <jeroen@unfix.org>
+ * - When compiled as IPv6 it also allows connecting to IPv4 hosts.
+ * - Added some more documentation.
+ *
+ * IPv6 patch 3 (18 November 2000) Jeroen Massar <jeroen@unfix.org>
+ * - It now supports dynamically loading the IPv6 resolver dll's.
+ * This way we should be able to distribute one (1) binary
+ * which supports both IPv4 and IPv6.
+ * - getaddrinfo() and getnameinfo() are loaded dynamicaly if possible.
+ * - in6addr_any is defined in this file so we don't need to link to wship6.lib
+ * - The patch is now more unified so that we can still
+ * remove all IPv6 support by undef'ing IPV6.
+ * But where it fallsback to IPv4 it uses the IPv4 code which is already in place...
+ * - Canonical name resolving works.
+ *
+ * IPv6 patch 4 (07 January 2001) Jeroen Massar <jeroen@unfix.org>
+ * - patch against CVS of today, will be submitted to the bugs list
+ * as a 'cvs diff -u' on Simon's request...
+ *
*/
-#include <windows.h>
+/*
+ * Define IPV6 to have IPv6 on-the-fly-loading support.
+ * This means that one doesn't have to have an IPv6 stack to use it.
+ * But if an IPv6 stack is found it is used with a fallback to IPv4.
+ */
+/* #define IPV6 1 */
+
+#ifdef IPV6
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <tpipv6.h>
+#else
#include <winsock.h>
+#endif
+#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
struct SockAddr_tag {
char *error;
- unsigned long address;
+ /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
+ int family;
+ unsigned long address; /* Address IPv4 style. */
+#ifdef IPV6
+ struct addrinfo *ai; /* Address IPv6 style. */
+#endif
+ /*
+ * We need to have this lengthy enough to hold *any* hostname
+ * (including IPv6 reverse...)
+ */
+ char realhost[8192];
};
struct buffer {
}
}
-SockAddr sk_namelookup(char *host, char **canonicalname) {
+SockAddr sk_namelookup(char *host, char **canonicalname)
+{
SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
unsigned long a;
- struct hostent *h;
+ struct hostent *h = NULL;
+
+ /* Clear the structure and default to IPv4. */
+ memset(ret, 0, sizeof(struct SockAddr_tag));
+ ret->family = 0; /* We set this one when we have resolved the host. */
+ *canonicalname = ret->realhost; /* This makes sure we always have a hostname to return. */
+
+ if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE)
+ {
+#ifdef IPV6
+
+ /* Try to get the getaddrinfo() function from wship6.dll */
+ /* This way one doesn't need to have IPv6 dll's to use PuTTY and
+ * it will fallback to IPv4. */
+ typedef int (CALLBACK* FGETADDRINFO)(const char *nodename,
+ const char *servname,
+ const struct addrinfo *hints,
+ struct addrinfo **res);
+ FGETADDRINFO fGetAddrInfo = NULL;
+
+ HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll");
+ if (dllWSHIP6)
+ fGetAddrInfo = (FGETADDRINFO)GetProcAddress(dllWSHIP6,
+ "getaddrinfo");
- ret->error = NULL;
- if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
- if ( (h = gethostbyname(host)) == NULL) {
+ /*
+ * Use fGetAddrInfo when it's available (which usually also
+ * means IPv6 is installed...)
+ */
+ if (fGetAddrInfo)
+ {
+ /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
+ if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0)
+ ret->family = ret->ai->ai_family;
+ }
+ else
+#endif
+ /*
+ * Otherwise use the IPv4-only gethostbyname...
+ * (NOTE: we don't use gethostbyname as a
+ * fallback!)
+ */
+ if (ret->family == 0)
+ {
+ /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
+ if (h = gethostbyname(host)) ret->family = AF_INET;
+ }
+ /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
+
+ if (ret->family == 0)
+ {
DWORD err = WSAGetLastError();
- ret->error = winsock_error_string(err);
- } else {
- memcpy (&a, h->h_addr, sizeof(a));
- *canonicalname = h->h_name;
+ ret->error = (err == WSAENETDOWN ? "Network is down" :
+ err == WSAHOST_NOT_FOUND ? "Host does not exist" :
+ err == WSATRY_AGAIN ? "Host not found" :
+#ifdef IPV6
+ fGetAddrInfo ? "getaddrinfo: unknown error" :
+#endif
+ "gethostbyname: unknown error");
+#ifdef DEBUG
+ {
+ LPVOID lpMsgBuf;
+ FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&lpMsgBuf, 0, NULL);
+ /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h));*/
+ /* Free the buffer. */
+ LocalFree(lpMsgBuf);
+ }
+#endif
}
- } else {
+ else
+ {
+ ret->error = NULL;
+
+#ifdef IPV6
+ /* If we got an address info use that... */
+ if (ret->ai)
+ {
+ typedef int (CALLBACK* FGETNAMEINFO)
+ (const struct sockaddr FAR *sa, socklen_t salen,
+ char FAR * host, size_t hostlen, char FAR * serv,
+ size_t servlen, int flags);
+ FGETNAMEINFO fGetNameInfo = NULL;
+
+ /* Are we in IPv4 fallback mode? */
+ /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
+ if (ret->family == AF_INET)
+ memcpy(&a, (char *)&((SOCKADDR_IN *)ret->ai->ai_addr)->sin_addr, sizeof(a));
+
+ /* Now let's find that canonicalname... */
+ if ((dllWSHIP6) && (fGetNameInfo = (FGETNAMEINFO)GetProcAddress(dllWSHIP6, "getnameinfo")))
+ {
+ if (fGetNameInfo((struct sockaddr *)ret->ai->ai_addr,
+ ret->family == AF_INET ?
+ sizeof(SOCKADDR_IN) :
+ sizeof(SOCKADDR_IN6), ret->realhost,
+ sizeof(ret->realhost), NULL,
+ 0, 0) != 0)
+ {
+ strncpy(ret->realhost, host,
+ sizeof(ret->realhost));
+ }
+ }
+ }
+ /* We used the IPv4-only gethostbyname()... */
+ else
+ {
+#endif
+ memcpy(&a, h->h_addr, sizeof(a));
+ /* This way we are always sure the h->h_name is valid :) */
+ strncpy(ret->realhost, h->h_name, sizeof(ret->realhost));
+#ifdef IPV6
+ }
+#endif
+ }
+#ifdef IPV6
+ FreeLibrary(dllWSHIP6);
+#endif
+ }
+ else
+ {
+ /*
+ * Hack inserted to deal with problems with numeric IPs.
+ * FIXME: how will this work in IPv6?
+ */
+ ret->family = AF_INET;
*canonicalname = host;
}
ret->address = ntohl(a);
-
return ret;
}
sfree(addr);
}
-Socket sk_new(SockAddr addr, int port, sk_receiver_t receiver) {
+Socket sk_new(SockAddr addr, int port, int privport, sk_receiver_t receiver) {
SOCKET s;
+#ifdef IPV6
+ SOCKADDR_IN6 a6;
+#endif
SOCKADDR_IN a;
DWORD err;
char *errstr;
Socket ret;
extern char *do_select(SOCKET skt, int startup);
+ short localport;
/*
* Create Socket structure.
/*
* Open socket.
*/
- s = socket(AF_INET, SOCK_STREAM, 0);
+ s = socket(addr->family, SOCK_STREAM, 0);
ret->s = s;
if (s == INVALID_SOCKET) {
/*
* Bind to local address.
*/
- a.sin_family = AF_INET;
- a.sin_addr.s_addr = htonl(INADDR_ANY);
- a.sin_port = htons(0);
- if (bind (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) {
- err = WSAGetLastError();
- ret->error = winsock_error_string(err);
+ if (privport)
+ localport = 1023; /* count from 1023 downwards */
+ else
+ localport = 0; /* just use port 0 (ie winsock picks) */
+
+ /* Loop round trying to bind */
+ while (1) {
+ int retcode;
+
+#ifdef IPV6
+ if (addr->family == AF_INET6)
+ {
+ memset(&a6,0,sizeof(a6));
+ a6.sin6_family = AF_INET6;
+ /*a6.sin6_addr = in6addr_any;*/ /* == 0 */
+ a6.sin6_port = htons(localport);
+ }
+ else
+ {
+#endif
+ a.sin_family = AF_INET;
+ a.sin_addr.s_addr = htonl(INADDR_ANY);
+ a.sin_port = htons(localport);
+#ifdef IPV6
+ }
+ retcode = bind (s, (addr->family == AF_INET6 ?
+ (struct sockaddr *)&a6 :
+ (struct sockaddr *)&a),
+ (addr->family == AF_INET6 ? sizeof(a6) : sizeof(a)));
+#else
+ retcode = bind (s, (struct sockaddr *)&a, sizeof(a));
+#endif
+ if (retcode != SOCKET_ERROR) {
+ err = 0;
+ break; /* done */
+ } else {
+ err = WSAGetLastError();
+ if (err != WSAEADDRINUSE) /* failed, for a bad reason */
+ break;
+ }
+
+ if (localport == 0)
+ break; /* we're only looping once */
+ localport--;
+ if (localport == 0)
+ break; /* we might have got to the end */
+ }
+
+ if (err)
+ {
+ ret->error = winsock_error_string(err);
return ret;
}
/*
* Connect to remote address.
*/
- a.sin_addr.s_addr = htonl(addr->address);
- a.sin_port = htons((short)port);
- if (connect (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) {
+#ifdef IPV6
+ if (addr->family == AF_INET6)
+ {
+ memset(&a,0,sizeof(a));
+ a6.sin6_family = AF_INET6;
+ a6.sin6_port = htons((short)port);
+ a6.sin6_addr = ((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr;
+ }
+ else
+ {
+#endif
+ a.sin_family = AF_INET;
+ a.sin_addr.s_addr = htonl(addr->address);
+ a.sin_port = htons((short)port);
+#ifdef IPV6
+ }
+ if (connect (s, (addr->family == AF_INET6) ? (struct sockaddr *)&a6 : (struct sockaddr *)&a, (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) == SOCKET_ERROR)
+#else
+ if (connect (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR)
+#endif
+ {
err = WSAGetLastError();
- ret->error = winsock_error_string(err);
+ ret->error = winsock_error_string(err);
return ret;
}
projects / u / mdw / putty / blobdiff