X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/putty/blobdiff_plain/39934deb5202149f98198c111a35c21cb4d0d0f8..ae400b95f17fe17dd310b9179d2941882c56a1e7:/windows/winnet.c diff --git a/windows/winnet.c b/windows/winnet.c index f2b2aaa4..eccdb6f6 100644 --- a/windows/winnet.c +++ b/windows/winnet.c @@ -1,43 +1,10 @@ /* * Windows networking abstraction. * - * Due to this clean abstraction it was possible - * to easily implement IPv6 support :) - * - * IPv6 patch 1 (27 October 2000) Jeroen Massar - * - 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 - * - When compiled as IPv6 it also allows connecting to IPv4 hosts. - * - Added some more documentation. - * - * IPv6 patch 3 (18 November 2000) Jeroen Massar - * - 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 - * - patch against CVS of today, will be submitted to the bugs list - * as a 'cvs diff -u' on Simon's request... - * + * For the IPv6 code in here I am indebted to Jeroen Massar and + * unfix.org. */ -/* - * 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 */ - #include #include #include @@ -48,13 +15,25 @@ #include "tree234.h" #include -#ifdef IPV6 -#include + +#ifndef NO_IPV6 +const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; +const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; #endif #define ipv4_is_loopback(addr) \ ((p_ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L) +/* + * We used to typedef struct Socket_tag *Socket. + * + * Since we have made the networking abstraction slightly more + * abstract, Socket no longer means a tcp socket (it could mean + * an ssl socket). So now we must use Actual_Socket when we know + * we are talking about a tcp socket. + */ +typedef struct Socket_tag *Actual_Socket; + struct Socket_tag { const struct socket_function_table *fn; /* the above variable absolutely *must* be the first in this structure */ @@ -73,18 +52,15 @@ struct Socket_tag { int sending_oob; int oobinline; int pending_error; /* in case send() returns error */ + /* + * We sometimes need pairs of Socket structures to be linked: + * if we are listening on the same IPv6 and v4 port, for + * example. So here we define `parent' and `child' pointers to + * track this link. + */ + Actual_Socket parent, child; }; -/* - * We used to typedef struct Socket_tag *Socket. - * - * Since we have made the networking abstraction slightly more - * abstract, Socket no longer means a tcp socket (it could mean - * an ssl socket). So now we must use Actual_Socket when we know - * we are talking about a tcp socket. - */ -typedef struct Socket_tag *Actual_Socket; - struct SockAddr_tag { char *error; /* @@ -92,11 +68,16 @@ struct SockAddr_tag { * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name * resolution has not been done and a simple host name is held * in this SockAddr structure. + * The hostname field is also used when the hostname has both + * an IPv6 and IPv4 address and the IPv6 connection attempt + * fails. We then try the IPv4 address. + * This 'family' should become an option in the GUI and + * on the commandline for selecting a default protocol. */ int family; unsigned long address; /* Address IPv4 style. */ -#ifdef IPV6 - struct addrinfo *ai; /* Address IPv6 style. */ +#ifndef NO_IPV6 + struct addrinfo *ai; /* Address AF-independent (IPv4+IPv6) style. */ #endif char hostname[512]; /* Store an unresolved host name. */ }; @@ -325,29 +306,36 @@ char *winsock_error_string(int error) } } -SockAddr sk_namelookup(const char *host, char **canonicalname) +SockAddr sk_namelookup(const char *host, char **canonicalname, + int address_family) { SockAddr ret = snew(struct SockAddr_tag); unsigned long a; struct hostent *h = NULL; char realhost[8192]; + int ret_family; + int err; /* 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. */ + ret->family = (address_family == ADDRTYPE_IPV4 ? AF_INET : +#ifndef NO_IPV6 + address_family == ADDRTYPE_IPV6 ? AF_INET6 : +#endif + AF_UNSPEC); + ret_family = AF_UNSPEC; *realhost = '\0'; if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) { -#ifdef IPV6 +#ifndef NO_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); + const struct addrinfo *hints, + struct addrinfo **res); FGETADDRINFO fGetAddrInfo = NULL; HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); @@ -356,56 +344,40 @@ SockAddr sk_namelookup(const char *host, char **canonicalname) "getaddrinfo"); /* - * Use fGetAddrInfo when it's available (which usually also - * means IPv6 is installed...) + * Use fGetAddrInfo when it's available */ 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; + struct addrinfo hints; + memset(&hints, 0, sizeof(hints)); + hints.ai_family = ret->family; + if ((err = fGetAddrInfo(host, NULL, &hints, &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!) + * (NOTE: we don't use gethostbyname as a fallback!) */ - if (ret->family == 0) { - /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ - if ( (h = p_gethostbyname(host)) ) - ret->family = AF_INET; - } + if ( (h = p_gethostbyname(host)) ) + ret_family = AF_INET; + else + err = p_WSAGetLastError(); } - /*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 = p_WSAGetLastError(); + if (ret_family == AF_UNSPEC) { ret->error = (err == WSAENETDOWN ? "Network is down" : - err == - WSAHOST_NOT_FOUND ? "Host does not exist" : err - == WSATRY_AGAIN ? "Host not found" : -#ifdef IPV6 + err == WSAHOST_NOT_FOUND ? "Host does not exist" : + err == WSATRY_AGAIN ? "Host not found" : +#ifndef NO_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 { ret->error = NULL; + ret->family = ret_family; -#ifdef IPV6 +#ifndef NO_IPV6 /* If we got an address info use that... */ if (ret->ai) { typedef int (CALLBACK * FGETNAMEINFO) @@ -445,7 +417,7 @@ SockAddr sk_namelookup(const char *host, char **canonicalname) strncpy(realhost, h->h_name, sizeof(realhost)); } } -#ifdef IPV6 +#ifndef NO_IPV6 FreeLibrary(dllWSHIP6); #endif } else { @@ -475,9 +447,30 @@ SockAddr sk_nonamelookup(const char *host) void sk_getaddr(SockAddr addr, char *buf, int buflen) { -#ifdef IPV6 +#ifndef NO_IPV6 if (addr->family == AF_INET6) { - FIXME; /* I don't know how to get a text form of an IPv6 address. */ + /* Try to get the WSAAddressToStringA() 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 * FADDRTOSTR) (LPSOCKADDR lpsaAddress, + DWORD dwAddressLength, + LPWSAPROTOCOL_INFO lpProtocolInfo, + OUT LPTSTR lpszAddressString, + IN OUT LPDWORD lpdwAddressStringLength + ); + FADDRTOSTR fAddrToStr = NULL; + + HINSTANCE dllWS2 = LoadLibrary("ws2_32.dll"); + if (dllWS2) { + fAddrToStr = (FADDRTOSTR)GetProcAddress(dllWS2, + "WSAAddressToStringA"); + if (fAddrToStr) { + fAddrToStr(addr->ai->ai_addr, addr->ai->ai_addrlen, + NULL, buf, &buflen); + } + else strncpy(buf, "IPv6", buflen); + FreeLibrary(dllWS2); + } } else #endif if (addr->family == AF_INET) { @@ -486,7 +479,6 @@ void sk_getaddr(SockAddr addr, char *buf, int buflen) strncpy(buf, p_inet_ntoa(a), buflen); buf[buflen-1] = '\0'; } else { - assert(addr->family == AF_UNSPEC); strncpy(buf, addr->hostname, buflen); buf[buflen-1] = '\0'; } @@ -530,9 +522,9 @@ static int ipv4_is_local_addr(struct in_addr addr) int sk_address_is_local(SockAddr addr) { -#ifdef IPV6 +#ifndef NO_IPV6 if (addr->family == AF_INET6) { - FIXME; /* someone who can compile for IPV6 had better do this bit */ + return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)addr->ai->ai_addr); } else #endif if (addr->family == AF_INET) { @@ -548,7 +540,7 @@ int sk_address_is_local(SockAddr addr) int sk_addrtype(SockAddr addr) { return (addr->family == AF_INET ? ADDRTYPE_IPV4 : -#ifdef IPV6 +#ifndef NO_IPV6 addr->family == AF_INET6 ? ADDRTYPE_IPV6 : #endif ADDRTYPE_NAME); @@ -557,7 +549,7 @@ int sk_addrtype(SockAddr addr) void sk_addrcopy(SockAddr addr, char *buf) { assert(addr->family != AF_UNSPEC); -#ifdef IPV6 +#ifndef NO_IPV6 if (addr->family == AF_INET6) { memcpy(buf, (char*) addr->ai, 16); } else @@ -633,6 +625,7 @@ Socket sk_register(void *sock, Plug plug) ret->frozen_readable = 0; ret->localhost_only = 0; /* unused, but best init anyway */ ret->pending_error = 0; + ret->parent = ret->child = NULL; ret->s = (SOCKET)sock; @@ -673,7 +666,7 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, }; SOCKET s; -#ifdef IPV6 +#ifndef NO_IPV6 SOCKADDR_IN6 a6; #endif SOCKADDR_IN a; @@ -697,11 +690,19 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, ret->frozen_readable = 0; ret->localhost_only = 0; /* unused, but best init anyway */ ret->pending_error = 0; + ret->parent = ret->child = NULL; /* * Open socket. */ - assert(addr->family != AF_UNSPEC); +#ifndef NO_IPV6 + /* Let's default to IPv6, this shouldn't hurt anybody + * If the stack supports IPv6 it will also allow IPv4 connections. */ + if (addr->family == AF_UNSPEC) addr->family = AF_INET6; +#else + /* No other choice, default to IPv4 */ + if (addr->family == AF_UNSPEC) addr->family = AF_INET; +#endif s = p_socket(addr->family, SOCK_STREAM, 0); ret->s = s; @@ -739,11 +740,11 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, while (1) { int retcode; -#ifdef IPV6 +#ifndef NO_IPV6 if (addr->family == AF_INET6) { memset(&a6, 0, sizeof(a6)); a6.sin6_family = AF_INET6; -/*a6.sin6_addr = in6addr_any; *//* == 0 */ + /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */ a6.sin6_port = p_htons(localport); } else #endif @@ -752,7 +753,7 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, a.sin_addr.s_addr = p_htonl(INADDR_ANY); a.sin_port = p_htons(localport); } -#ifdef IPV6 +#ifndef NO_IPV6 retcode = p_bind(s, (addr->family == AF_INET6 ? (struct sockaddr *) &a6 : (struct sockaddr *) &a), @@ -785,7 +786,7 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, /* * Connect to remote address. */ -#ifdef IPV6 +#ifndef NO_IPV6 if (addr->family == AF_INET6) { memset(&a, 0, sizeof(a)); a6.sin6_family = AF_INET6; @@ -809,7 +810,7 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, } if (( -#ifdef IPV6 +#ifndef NO_IPV6 p_connect(s, ((addr->family == AF_INET6) ? (struct sockaddr *) &a6 : (struct sockaddr *) &a), (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) @@ -844,7 +845,8 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, return (Socket) ret; } -Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) +Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, + int orig_address_family) { static const struct socket_function_table fn_table = { sk_tcp_plug, @@ -859,16 +861,19 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) }; SOCKET s; -#ifdef IPV6 +#ifndef NO_IPV6 SOCKADDR_IN6 a6; #endif SOCKADDR_IN a; + DWORD err; char *errstr; Actual_Socket ret; int retcode; int on = 1; + int address_family; + /* * Create Socket structure. */ @@ -883,11 +888,31 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) ret->frozen_readable = 0; ret->localhost_only = local_host_only; ret->pending_error = 0; + ret->parent = ret->child = NULL; + + /* + * Translate address_family from platform-independent constants + * into local reality. + */ + address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET : +#ifndef NO_IPV6 + orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 : +#endif + AF_UNSPEC); + + /* + * Our default, if passed the `don't care' value + * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported, + * we will also set up a second socket listening on IPv6, but + * the v4 one is primary since that ought to work even on + * non-v6-supporting systems. + */ + if (address_family == AF_UNSPEC) address_family = AF_INET; /* * Open socket. */ - s = p_socket(AF_INET, SOCK_STREAM, 0); + s = p_socket(address_family, SOCK_STREAM, 0); ret->s = s; if (s == INVALID_SOCKET) { @@ -900,12 +925,15 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); -#ifdef IPV6 - if (addr->family == AF_INET6) { +#ifndef NO_IPV6 + if (address_family == AF_INET6) { memset(&a6, 0, sizeof(a6)); a6.sin6_family = AF_INET6; /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't - * know how to do it. :-) */ + * know how to do it. :-) + * (jeroen:) saddr is specified as an address.. eg 2001:db8::1 + * Thus we need either a parser that understands [2001:db8::1]:80 + * style addresses and/or enhance this to understand hostnames too. */ if (local_host_only) a6.sin6_addr = in6addr_loopback; else @@ -942,11 +970,11 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) a.sin_port = p_htons((short)port); } -#ifdef IPV6 - retcode = p_bind(s, (addr->family == AF_INET6 ? +#ifndef NO_IPV6 + retcode = p_bind(s, (address_family == AF_INET6 ? (struct sockaddr *) &a6 : (struct sockaddr *) &a), - (addr->family == + (address_family == AF_INET6 ? sizeof(a6) : sizeof(a))); #else retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a)); @@ -958,6 +986,7 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) } if (err) { + p_closesocket(s); ret->error = winsock_error_string(err); return (Socket) ret; } @@ -973,12 +1002,35 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) * window, or an EventSelect on an event object. */ errstr = do_select(s, 1); if (errstr) { + p_closesocket(s); ret->error = errstr; return (Socket) ret; } add234(sktree, ret); +#ifndef NO_IPV6 + /* + * If we were given ADDRTYPE_UNSPEC, we must also create an + * IPv6 listening socket and link it to this one. + */ + if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) { + Actual_Socket other; + + other = (Actual_Socket) sk_newlistener(srcaddr, port, plug, + local_host_only, ADDRTYPE_IPV6); + + if (other) { + if (!other->error) { + other->parent = ret; + ret->child = other; + } else { + sfree(other); + } + } + } +#endif + return (Socket) ret; } @@ -987,6 +1039,9 @@ static void sk_tcp_close(Socket sock) extern char *do_select(SOCKET skt, int startup); Actual_Socket s = (Actual_Socket) sock; + if (s->child) + sk_tcp_close((Socket)s->child); + del234(sktree, s); do_select(s->s, 0); p_closesocket(s->s); @@ -1229,11 +1284,15 @@ int select_result(WPARAM wParam, LPARAM lParam) return open; case FD_ACCEPT: { +#ifdef NO_IPV6 struct sockaddr_in isa; - int addrlen = sizeof(struct sockaddr_in); +#else + struct sockaddr_storage isa; +#endif + int addrlen = sizeof(isa); SOCKET t; /* socket of connection */ - memset(&isa, 0, sizeof(struct sockaddr_in)); + memset(&isa, 0, sizeof(isa)); err = 0; t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen); if (t == INVALID_SOCKET) @@ -1242,8 +1301,13 @@ int select_result(WPARAM wParam, LPARAM lParam) if (err == WSATRY_AGAIN) break; } - +#ifndef NO_IPV6 + if (isa.ss_family == AF_INET && + s->localhost_only && + !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr)) { +#else if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr)) { +#endif p_closesocket(t); /* dodgy WinSock let nonlocal through */ } else if (plug_accepting(s->plug, (void*)t)) { p_closesocket(t); /* denied or error */