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-rw-r--r--tools/plink/winnet.c3582
1 files changed, 1835 insertions, 1747 deletions
diff --git a/tools/plink/winnet.c b/tools/plink/winnet.c
index 11f9ba52e..039701cf0 100644
--- a/tools/plink/winnet.c
+++ b/tools/plink/winnet.c
@@ -1,1747 +1,1835 @@
-/*
- * Windows networking abstraction.
- *
- * For the IPv6 code in here I am indebted to Jeroen Massar and
- * unfix.org.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <assert.h>
-
-#define DEFINE_PLUG_METHOD_MACROS
-#include "putty.h"
-#include "network.h"
-#include "tree234.h"
-
-#include <ws2tcpip.h>
-
-#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;
-
-/*
- * Mutable state that goes with a SockAddr: stores information
- * about where in the list of candidate IP(v*) addresses we've
- * currently got to.
- */
-typedef struct SockAddrStep_tag SockAddrStep;
-struct SockAddrStep_tag {
-#ifndef NO_IPV6
- struct addrinfo *ai; /* steps along addr->ais */
-#endif
- int curraddr;
-};
-
-struct Socket_tag {
- const struct socket_function_table *fn;
- /* the above variable absolutely *must* be the first in this structure */
- char *error;
- SOCKET s;
- Plug plug;
- void *private_ptr;
- bufchain output_data;
- int connected;
- int writable;
- int frozen; /* this causes readability notifications to be ignored */
- int frozen_readable; /* this means we missed at least one readability
- * notification while we were frozen */
- int localhost_only; /* for listening sockets */
- char oobdata[1];
- int sending_oob;
- int oobinline, nodelay, keepalive, privport;
- enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
- SockAddr addr;
- SockAddrStep step;
- int port;
- 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;
-};
-
-struct SockAddr_tag {
- int refcount;
- char *error;
- int resolved;
-#ifndef NO_IPV6
- struct addrinfo *ais; /* Addresses IPv6 style. */
-#endif
- unsigned long *addresses; /* Addresses IPv4 style. */
- int naddresses;
- char hostname[512]; /* Store an unresolved host name. */
-};
-
-/*
- * Which address family this address belongs to. AF_INET for 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.
- */
-#ifndef NO_IPV6
-#define SOCKADDR_FAMILY(addr, step) \
- (!(addr)->resolved ? AF_UNSPEC : \
- (step).ai ? (step).ai->ai_family : AF_INET)
-#else
-#define SOCKADDR_FAMILY(addr, step) \
- (!(addr)->resolved ? AF_UNSPEC : AF_INET)
-#endif
-
-/*
- * Start a SockAddrStep structure to step through multiple
- * addresses.
- */
-#ifndef NO_IPV6
-#define START_STEP(addr, step) \
- ((step).ai = (addr)->ais, (step).curraddr = 0)
-#else
-#define START_STEP(addr, step) \
- ((step).curraddr = 0)
-#endif
-
-static tree234 *sktree;
-
-static int cmpfortree(void *av, void *bv)
-{
- Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
- unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
- if (as < bs)
- return -1;
- if (as > bs)
- return +1;
- if (a < b)
- return -1;
- if (a > b)
- return +1;
- return 0;
-}
-
-static int cmpforsearch(void *av, void *bv)
-{
- Actual_Socket b = (Actual_Socket) bv;
- unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
- if (as < bs)
- return -1;
- if (as > bs)
- return +1;
- return 0;
-}
-
-DECL_WINDOWS_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
-DECL_WINDOWS_FUNCTION(static, int, WSACleanup, (void));
-DECL_WINDOWS_FUNCTION(static, int, closesocket, (SOCKET));
-DECL_WINDOWS_FUNCTION(static, u_long, ntohl, (u_long));
-DECL_WINDOWS_FUNCTION(static, u_long, htonl, (u_long));
-DECL_WINDOWS_FUNCTION(static, u_short, htons, (u_short));
-DECL_WINDOWS_FUNCTION(static, u_short, ntohs, (u_short));
-DECL_WINDOWS_FUNCTION(static, int, gethostname, (char *, int));
-DECL_WINDOWS_FUNCTION(static, struct hostent FAR *, gethostbyname,
- (const char FAR *));
-DECL_WINDOWS_FUNCTION(static, struct servent FAR *, getservbyname,
- (const char FAR *, const char FAR *));
-DECL_WINDOWS_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
-DECL_WINDOWS_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
-DECL_WINDOWS_FUNCTION(static, int, connect,
- (SOCKET, const struct sockaddr FAR *, int));
-DECL_WINDOWS_FUNCTION(static, int, bind,
- (SOCKET, const struct sockaddr FAR *, int));
-DECL_WINDOWS_FUNCTION(static, int, setsockopt,
- (SOCKET, int, int, const char FAR *, int));
-DECL_WINDOWS_FUNCTION(static, SOCKET, socket, (int, int, int));
-DECL_WINDOWS_FUNCTION(static, int, listen, (SOCKET, int));
-DECL_WINDOWS_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
-DECL_WINDOWS_FUNCTION(static, int, shutdown, (SOCKET, int));
-DECL_WINDOWS_FUNCTION(static, int, ioctlsocket,
- (SOCKET, long, u_long FAR *));
-DECL_WINDOWS_FUNCTION(static, SOCKET, accept,
- (SOCKET, struct sockaddr FAR *, int FAR *));
-DECL_WINDOWS_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
-DECL_WINDOWS_FUNCTION(static, int, WSAIoctl,
- (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
- LPDWORD, LPWSAOVERLAPPED,
- LPWSAOVERLAPPED_COMPLETION_ROUTINE));
-#ifndef NO_IPV6
-DECL_WINDOWS_FUNCTION(static, int, getaddrinfo,
- (const char *nodename, const char *servname,
- const struct addrinfo *hints, struct addrinfo **res));
-DECL_WINDOWS_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
-DECL_WINDOWS_FUNCTION(static, int, getnameinfo,
- (const struct sockaddr FAR * sa, socklen_t salen,
- char FAR * host, size_t hostlen, char FAR * serv,
- size_t servlen, int flags));
-DECL_WINDOWS_FUNCTION(static, char *, gai_strerror, (int ecode));
-DECL_WINDOWS_FUNCTION(static, int, WSAAddressToStringA,
- (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO,
- LPSTR, LPDWORD));
-#endif
-
-static HMODULE winsock_module = NULL;
-static WSADATA wsadata;
-#ifndef NO_IPV6
-static HMODULE winsock2_module = NULL;
-static HMODULE wship6_module = NULL;
-#endif
-
-int sk_startup(int hi, int lo)
-{
- WORD winsock_ver;
-
- winsock_ver = MAKEWORD(hi, lo);
-
- if (p_WSAStartup(winsock_ver, &wsadata)) {
- return FALSE;
- }
-
- if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
- return FALSE;
- }
-
-#ifdef NET_SETUP_DIAGNOSTICS
- {
- char buf[80];
- sprintf(buf, "Using WinSock %d.%d", hi, lo);
- logevent(NULL, buf);
- }
-#endif
- return TRUE;
-}
-
-void sk_init(void)
-{
-#ifndef NO_IPV6
- winsock2_module =
-#endif
- winsock_module = load_system32_dll("ws2_32.dll");
- if (!winsock_module) {
- winsock_module = load_system32_dll("wsock32.dll");
- }
- if (!winsock_module)
- fatalbox("Unable to load any WinSock library");
-
-#ifndef NO_IPV6
- /* Check if we have getaddrinfo in Winsock */
- if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
-#ifdef NET_SETUP_DIAGNOSTICS
- logevent(NULL, "Native WinSock IPv6 support detected");
-#endif
- GET_WINDOWS_FUNCTION(winsock_module, getaddrinfo);
- GET_WINDOWS_FUNCTION(winsock_module, freeaddrinfo);
- GET_WINDOWS_FUNCTION(winsock_module, getnameinfo);
- GET_WINDOWS_FUNCTION(winsock_module, gai_strerror);
- } else {
- /* Fall back to wship6.dll for Windows 2000 */
- wship6_module = load_system32_dll("wship6.dll");
- if (wship6_module) {
-#ifdef NET_SETUP_DIAGNOSTICS
- logevent(NULL, "WSH IPv6 support detected");
-#endif
- GET_WINDOWS_FUNCTION(wship6_module, getaddrinfo);
- GET_WINDOWS_FUNCTION(wship6_module, freeaddrinfo);
- GET_WINDOWS_FUNCTION(wship6_module, getnameinfo);
- GET_WINDOWS_FUNCTION(wship6_module, gai_strerror);
- } else {
-#ifdef NET_SETUP_DIAGNOSTICS
- logevent(NULL, "No IPv6 support detected");
-#endif
- }
- }
- GET_WINDOWS_FUNCTION(winsock2_module, WSAAddressToStringA);
-#else
-#ifdef NET_SETUP_DIAGNOSTICS
- logevent(NULL, "PuTTY was built without IPv6 support");
-#endif
-#endif
-
- GET_WINDOWS_FUNCTION(winsock_module, WSAAsyncSelect);
- GET_WINDOWS_FUNCTION(winsock_module, WSAEventSelect);
- GET_WINDOWS_FUNCTION(winsock_module, select);
- GET_WINDOWS_FUNCTION(winsock_module, WSAGetLastError);
- GET_WINDOWS_FUNCTION(winsock_module, WSAEnumNetworkEvents);
- GET_WINDOWS_FUNCTION(winsock_module, WSAStartup);
- GET_WINDOWS_FUNCTION(winsock_module, WSACleanup);
- GET_WINDOWS_FUNCTION(winsock_module, closesocket);
- GET_WINDOWS_FUNCTION(winsock_module, ntohl);
- GET_WINDOWS_FUNCTION(winsock_module, htonl);
- GET_WINDOWS_FUNCTION(winsock_module, htons);
- GET_WINDOWS_FUNCTION(winsock_module, ntohs);
- GET_WINDOWS_FUNCTION(winsock_module, gethostname);
- GET_WINDOWS_FUNCTION(winsock_module, gethostbyname);
- GET_WINDOWS_FUNCTION(winsock_module, getservbyname);
- GET_WINDOWS_FUNCTION(winsock_module, inet_addr);
- GET_WINDOWS_FUNCTION(winsock_module, inet_ntoa);
- GET_WINDOWS_FUNCTION(winsock_module, connect);
- GET_WINDOWS_FUNCTION(winsock_module, bind);
- GET_WINDOWS_FUNCTION(winsock_module, setsockopt);
- GET_WINDOWS_FUNCTION(winsock_module, socket);
- GET_WINDOWS_FUNCTION(winsock_module, listen);
- GET_WINDOWS_FUNCTION(winsock_module, send);
- GET_WINDOWS_FUNCTION(winsock_module, shutdown);
- GET_WINDOWS_FUNCTION(winsock_module, ioctlsocket);
- GET_WINDOWS_FUNCTION(winsock_module, accept);
- GET_WINDOWS_FUNCTION(winsock_module, recv);
- GET_WINDOWS_FUNCTION(winsock_module, WSAIoctl);
-
- /* Try to get the best WinSock version we can get */
- if (!sk_startup(2,2) &&
- !sk_startup(2,0) &&
- !sk_startup(1,1)) {
- fatalbox("Unable to initialise WinSock");
- }
-
- sktree = newtree234(cmpfortree);
-}
-
-void sk_cleanup(void)
-{
- Actual_Socket s;
- int i;
-
- if (sktree) {
- for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
- p_closesocket(s->s);
- }
- freetree234(sktree);
- sktree = NULL;
- }
-
- if (p_WSACleanup)
- p_WSACleanup();
- if (winsock_module)
- FreeLibrary(winsock_module);
-#ifndef NO_IPV6
- if (wship6_module)
- FreeLibrary(wship6_module);
-#endif
-}
-
-char *winsock_error_string(int error)
-{
- switch (error) {
- case WSAEACCES:
- return "Network error: Permission denied";
- case WSAEADDRINUSE:
- return "Network error: Address already in use";
- case WSAEADDRNOTAVAIL:
- return "Network error: Cannot assign requested address";
- case WSAEAFNOSUPPORT:
- return
- "Network error: Address family not supported by protocol family";
- case WSAEALREADY:
- return "Network error: Operation already in progress";
- case WSAECONNABORTED:
- return "Network error: Software caused connection abort";
- case WSAECONNREFUSED:
- return "Network error: Connection refused";
- case WSAECONNRESET:
- return "Network error: Connection reset by peer";
- case WSAEDESTADDRREQ:
- return "Network error: Destination address required";
- case WSAEFAULT:
- return "Network error: Bad address";
- case WSAEHOSTDOWN:
- return "Network error: Host is down";
- case WSAEHOSTUNREACH:
- return "Network error: No route to host";
- case WSAEINPROGRESS:
- return "Network error: Operation now in progress";
- case WSAEINTR:
- return "Network error: Interrupted function call";
- case WSAEINVAL:
- return "Network error: Invalid argument";
- case WSAEISCONN:
- return "Network error: Socket is already connected";
- case WSAEMFILE:
- return "Network error: Too many open files";
- case WSAEMSGSIZE:
- return "Network error: Message too long";
- case WSAENETDOWN:
- return "Network error: Network is down";
- case WSAENETRESET:
- return "Network error: Network dropped connection on reset";
- case WSAENETUNREACH:
- return "Network error: Network is unreachable";
- case WSAENOBUFS:
- return "Network error: No buffer space available";
- case WSAENOPROTOOPT:
- return "Network error: Bad protocol option";
- case WSAENOTCONN:
- return "Network error: Socket is not connected";
- case WSAENOTSOCK:
- return "Network error: Socket operation on non-socket";
- case WSAEOPNOTSUPP:
- return "Network error: Operation not supported";
- case WSAEPFNOSUPPORT:
- return "Network error: Protocol family not supported";
- case WSAEPROCLIM:
- return "Network error: Too many processes";
- case WSAEPROTONOSUPPORT:
- return "Network error: Protocol not supported";
- case WSAEPROTOTYPE:
- return "Network error: Protocol wrong type for socket";
- case WSAESHUTDOWN:
- return "Network error: Cannot send after socket shutdown";
- case WSAESOCKTNOSUPPORT:
- return "Network error: Socket type not supported";
- case WSAETIMEDOUT:
- return "Network error: Connection timed out";
- case WSAEWOULDBLOCK:
- return "Network error: Resource temporarily unavailable";
- case WSAEDISCON:
- return "Network error: Graceful shutdown in progress";
- default:
- return "Unknown network error";
- }
-}
-
-SockAddr sk_namelookup(const char *host, char **canonicalname,
- int address_family)
-{
- SockAddr ret = snew(struct SockAddr_tag);
- unsigned long a;
- char realhost[8192];
- int hint_family;
-
- /* Default to IPv4. */
- hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
-#ifndef NO_IPV6
- address_family == ADDRTYPE_IPV6 ? AF_INET6 :
-#endif
- AF_UNSPEC);
-
- /* Clear the structure and default to IPv4. */
- memset(ret, 0, sizeof(struct SockAddr_tag));
-#ifndef NO_IPV6
- ret->ais = NULL;
-#endif
- ret->addresses = NULL;
- ret->resolved = FALSE;
- ret->refcount = 1;
- *realhost = '\0';
-
- if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
- struct hostent *h = NULL;
- int err;
-#ifndef NO_IPV6
- /*
- * Use getaddrinfo when it's available
- */
- if (p_getaddrinfo) {
- struct addrinfo hints;
-#ifdef NET_SETUP_DIAGNOSTICS
- logevent(NULL, "Using getaddrinfo() for resolving");
-#endif
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = hint_family;
- hints.ai_flags = AI_CANONNAME;
- if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0)
- ret->resolved = TRUE;
- } else
-#endif
- {
-#ifdef NET_SETUP_DIAGNOSTICS
- logevent(NULL, "Using gethostbyname() for resolving");
-#endif
- /*
- * Otherwise use the IPv4-only gethostbyname...
- * (NOTE: we don't use gethostbyname as a fallback!)
- */
- if ( (h = p_gethostbyname(host)) )
- ret->resolved = TRUE;
- else
- err = p_WSAGetLastError();
- }
-
- if (!ret->resolved) {
- ret->error = (err == WSAENETDOWN ? "Network is down" :
- err == WSAHOST_NOT_FOUND ? "Host does not exist" :
- err == WSATRY_AGAIN ? "Host not found" :
-#ifndef NO_IPV6
- p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) :
-#endif
- "gethostbyname: unknown error");
- } else {
- ret->error = NULL;
-
-#ifndef NO_IPV6
- /* If we got an address info use that... */
- if (ret->ais) {
- /* 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->ais->ai_family == AF_INET)
- memcpy(&a,
- (char *) &((SOCKADDR_IN *) ret->ais->
- ai_addr)->sin_addr, sizeof(a));
-
- if (ret->ais->ai_canonname)
- strncpy(realhost, ret->ais->ai_canonname, lenof(realhost));
- else
- strncpy(realhost, host, lenof(realhost));
- }
- /* We used the IPv4-only gethostbyname()... */
- else
-#endif
- {
- int n;
- for (n = 0; h->h_addr_list[n]; n++);
- ret->addresses = snewn(n, unsigned long);
- ret->naddresses = n;
- for (n = 0; n < ret->naddresses; n++) {
- memcpy(&a, h->h_addr_list[n], sizeof(a));
- ret->addresses[n] = p_ntohl(a);
- }
- memcpy(&a, h->h_addr, sizeof(a));
- /* This way we are always sure the h->h_name is valid :) */
- strncpy(realhost, h->h_name, sizeof(realhost));
- }
- }
- } else {
- /*
- * This must be a numeric IPv4 address because it caused a
- * success return from inet_addr.
- */
- ret->addresses = snewn(1, unsigned long);
- ret->naddresses = 1;
- ret->addresses[0] = p_ntohl(a);
- ret->resolved = TRUE;
- strncpy(realhost, host, sizeof(realhost));
- }
- realhost[lenof(realhost)-1] = '\0';
- *canonicalname = snewn(1+strlen(realhost), char);
- strcpy(*canonicalname, realhost);
- return ret;
-}
-
-SockAddr sk_nonamelookup(const char *host)
-{
- SockAddr ret = snew(struct SockAddr_tag);
- ret->error = NULL;
- ret->resolved = FALSE;
-#ifndef NO_IPV6
- ret->ais = NULL;
-#endif
- ret->addresses = NULL;
- ret->naddresses = 0;
- ret->refcount = 1;
- strncpy(ret->hostname, host, lenof(ret->hostname));
- ret->hostname[lenof(ret->hostname)-1] = '\0';
- return ret;
-}
-
-int sk_nextaddr(SockAddr addr, SockAddrStep *step)
-{
-#ifndef NO_IPV6
- if (step->ai) {
- if (step->ai->ai_next) {
- step->ai = step->ai->ai_next;
- return TRUE;
- } else
- return FALSE;
- }
-#endif
- if (step->curraddr+1 < addr->naddresses) {
- step->curraddr++;
- return TRUE;
- } else {
- return FALSE;
- }
-}
-
-void sk_getaddr(SockAddr addr, char *buf, int buflen)
-{
- SockAddrStep step;
- START_STEP(addr, step);
-
-#ifndef NO_IPV6
- if (step.ai) {
- int err = 0;
- if (p_WSAAddressToStringA) {
- DWORD dwbuflen = buflen;
- err = p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen,
- NULL, buf, &dwbuflen);
- } else
- err = -1;
- if (err) {
- strncpy(buf, addr->hostname, buflen);
- if (!buf[0])
- strncpy(buf, "<unknown>", buflen);
- buf[buflen-1] = '\0';
- }
- } else
-#endif
- if (SOCKADDR_FAMILY(addr, step) == AF_INET) {
- struct in_addr a;
- assert(addr->addresses && step.curraddr < addr->naddresses);
- a.s_addr = p_htonl(addr->addresses[step.curraddr]);
- strncpy(buf, p_inet_ntoa(a), buflen);
- buf[buflen-1] = '\0';
- } else {
- strncpy(buf, addr->hostname, buflen);
- buf[buflen-1] = '\0';
- }
-}
-
-int sk_hostname_is_local(char *name)
-{
- return !strcmp(name, "localhost") ||
- !strcmp(name, "::1") ||
- !strncmp(name, "127.", 4);
-}
-
-static INTERFACE_INFO local_interfaces[16];
-static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
-
-static int ipv4_is_local_addr(struct in_addr addr)
-{
- if (ipv4_is_loopback(addr))
- return 1; /* loopback addresses are local */
- if (!n_local_interfaces) {
- SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
- DWORD retbytes;
-
- if (p_WSAIoctl &&
- p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
- local_interfaces, sizeof(local_interfaces),
- &retbytes, NULL, NULL) == 0)
- n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
- else
- logevent(NULL, "Unable to get list of local IP addresses");
- }
- if (n_local_interfaces > 0) {
- int i;
- for (i = 0; i < n_local_interfaces; i++) {
- SOCKADDR_IN *address =
- (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
- if (address->sin_addr.s_addr == addr.s_addr)
- return 1; /* this address is local */
- }
- }
- return 0; /* this address is not local */
-}
-
-int sk_address_is_local(SockAddr addr)
-{
- SockAddrStep step;
- int family;
- START_STEP(addr, step);
- family = SOCKADDR_FAMILY(addr, step);
-
-#ifndef NO_IPV6
- if (family == AF_INET6) {
- return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)step.ai->ai_addr);
- } else
-#endif
- if (family == AF_INET) {
-#ifndef NO_IPV6
- if (step.ai) {
- return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr)
- ->sin_addr);
- } else
-#endif
- {
- struct in_addr a;
- assert(addr->addresses && step.curraddr < addr->naddresses);
- a.s_addr = p_htonl(addr->addresses[step.curraddr]);
- return ipv4_is_local_addr(a);
- }
- } else {
- assert(family == AF_UNSPEC);
- return 0; /* we don't know; assume not */
- }
-}
-
-int sk_addrtype(SockAddr addr)
-{
- SockAddrStep step;
- int family;
- START_STEP(addr, step);
- family = SOCKADDR_FAMILY(addr, step);
-
- return (family == AF_INET ? ADDRTYPE_IPV4 :
-#ifndef NO_IPV6
- family == AF_INET6 ? ADDRTYPE_IPV6 :
-#endif
- ADDRTYPE_NAME);
-}
-
-void sk_addrcopy(SockAddr addr, char *buf)
-{
- SockAddrStep step;
- int family;
- START_STEP(addr, step);
- family = SOCKADDR_FAMILY(addr, step);
-
- assert(family != AF_UNSPEC);
-#ifndef NO_IPV6
- if (step.ai) {
- if (family == AF_INET)
- memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
- sizeof(struct in_addr));
- else if (family == AF_INET6)
- memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
- sizeof(struct in6_addr));
- else
- assert(FALSE);
- } else
-#endif
- if (family == AF_INET) {
- struct in_addr a;
- assert(addr->addresses && step.curraddr < addr->naddresses);
- a.s_addr = p_htonl(addr->addresses[step.curraddr]);
- memcpy(buf, (char*) &a.s_addr, 4);
- }
-}
-
-void sk_addr_free(SockAddr addr)
-{
- if (--addr->refcount > 0)
- return;
-#ifndef NO_IPV6
- if (addr->ais && p_freeaddrinfo)
- p_freeaddrinfo(addr->ais);
-#endif
- if (addr->addresses)
- sfree(addr->addresses);
- sfree(addr);
-}
-
-SockAddr sk_addr_dup(SockAddr addr)
-{
- addr->refcount++;
- return addr;
-}
-
-static Plug sk_tcp_plug(Socket sock, Plug p)
-{
- Actual_Socket s = (Actual_Socket) sock;
- Plug ret = s->plug;
- if (p)
- s->plug = p;
- return ret;
-}
-
-static void sk_tcp_flush(Socket s)
-{
- /*
- * We send data to the socket as soon as we can anyway,
- * so we don't need to do anything here. :-)
- */
-}
-
-static void sk_tcp_close(Socket s);
-static int sk_tcp_write(Socket s, const char *data, int len);
-static int sk_tcp_write_oob(Socket s, const char *data, int len);
-static void sk_tcp_write_eof(Socket s);
-static void sk_tcp_set_private_ptr(Socket s, void *ptr);
-static void *sk_tcp_get_private_ptr(Socket s);
-static void sk_tcp_set_frozen(Socket s, int is_frozen);
-static const char *sk_tcp_socket_error(Socket s);
-
-extern char *do_select(SOCKET skt, int startup);
-
-Socket sk_register(void *sock, Plug plug)
-{
- static const struct socket_function_table fn_table = {
- sk_tcp_plug,
- sk_tcp_close,
- sk_tcp_write,
- sk_tcp_write_oob,
- sk_tcp_write_eof,
- sk_tcp_flush,
- sk_tcp_set_private_ptr,
- sk_tcp_get_private_ptr,
- sk_tcp_set_frozen,
- sk_tcp_socket_error
- };
-
- DWORD err;
- char *errstr;
- Actual_Socket ret;
-
- /*
- * Create Socket structure.
- */
- ret = snew(struct Socket_tag);
- ret->fn = &fn_table;
- ret->error = NULL;
- ret->plug = plug;
- bufchain_init(&ret->output_data);
- ret->writable = 1; /* to start with */
- ret->sending_oob = 0;
- ret->outgoingeof = EOF_NO;
- ret->frozen = 1;
- ret->frozen_readable = 0;
- ret->localhost_only = 0; /* unused, but best init anyway */
- ret->pending_error = 0;
- ret->parent = ret->child = NULL;
- ret->addr = NULL;
-
- ret->s = (SOCKET)sock;
-
- if (ret->s == INVALID_SOCKET) {
- err = p_WSAGetLastError();
- ret->error = winsock_error_string(err);
- return (Socket) ret;
- }
-
- ret->oobinline = 0;
-
- /* Set up a select mechanism. This could be an AsyncSelect on a
- * window, or an EventSelect on an event object. */
- errstr = do_select(ret->s, 1);
- if (errstr) {
- ret->error = errstr;
- return (Socket) ret;
- }
-
- add234(sktree, ret);
-
- return (Socket) ret;
-}
-
-static DWORD try_connect(Actual_Socket sock)
-{
- SOCKET s;
-#ifndef NO_IPV6
- SOCKADDR_IN6 a6;
-#endif
- SOCKADDR_IN a;
- DWORD err;
- char *errstr;
- short localport;
- int family;
-
- if (sock->s != INVALID_SOCKET) {
- do_select(sock->s, 0);
- p_closesocket(sock->s);
- }
-
- plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
-
- /*
- * Open socket.
- */
- family = SOCKADDR_FAMILY(sock->addr, sock->step);
-
- /*
- * Remove the socket from the tree before we overwrite its
- * internal socket id, because that forms part of the tree's
- * sorting criterion. We'll add it back before exiting this
- * function, whether we changed anything or not.
- */
- del234(sktree, sock);
-
- s = p_socket(family, SOCK_STREAM, 0);
- sock->s = s;
-
- if (s == INVALID_SOCKET) {
- err = p_WSAGetLastError();
- sock->error = winsock_error_string(err);
- goto ret;
- }
-
- if (sock->oobinline) {
- BOOL b = TRUE;
- p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
- }
-
- if (sock->nodelay) {
- BOOL b = TRUE;
- p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
- }
-
- if (sock->keepalive) {
- BOOL b = TRUE;
- p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
- }
-
- /*
- * Bind to local address.
- */
- if (sock->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 sockcode;
-
-#ifndef NO_IPV6
- if (family == AF_INET6) {
- memset(&a6, 0, sizeof(a6));
- a6.sin6_family = AF_INET6;
- /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
- a6.sin6_port = p_htons(localport);
- } else
-#endif
- {
- a.sin_family = AF_INET;
- a.sin_addr.s_addr = p_htonl(INADDR_ANY);
- a.sin_port = p_htons(localport);
- }
-#ifndef NO_IPV6
- sockcode = p_bind(s, (family == AF_INET6 ?
- (struct sockaddr *) &a6 :
- (struct sockaddr *) &a),
- (family == AF_INET6 ? sizeof(a6) : sizeof(a)));
-#else
- sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
-#endif
- if (sockcode != SOCKET_ERROR) {
- err = 0;
- break; /* done */
- } else {
- err = p_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) {
- sock->error = winsock_error_string(err);
- goto ret;
- }
-
- /*
- * Connect to remote address.
- */
-#ifndef NO_IPV6
- if (sock->step.ai) {
- if (family == AF_INET6) {
- a6.sin6_family = AF_INET6;
- a6.sin6_port = p_htons((short) sock->port);
- a6.sin6_addr =
- ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr;
- a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo;
- a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id;
- } else {
- a.sin_family = AF_INET;
- a.sin_addr =
- ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr;
- a.sin_port = p_htons((short) sock->port);
- }
- } else
-#endif
- {
- assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses);
- a.sin_family = AF_INET;
- a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]);
- a.sin_port = p_htons((short) sock->port);
- }
-
- /* Set up a select mechanism. This could be an AsyncSelect on a
- * window, or an EventSelect on an event object. */
- errstr = do_select(s, 1);
- if (errstr) {
- sock->error = errstr;
- err = 1;
- goto ret;
- }
-
- if ((
-#ifndef NO_IPV6
- p_connect(s,
- ((family == AF_INET6) ? (struct sockaddr *) &a6 :
- (struct sockaddr *) &a),
- (family == AF_INET6) ? sizeof(a6) : sizeof(a))
-#else
- p_connect(s, (struct sockaddr *) &a, sizeof(a))
-#endif
- ) == SOCKET_ERROR) {
- err = p_WSAGetLastError();
- /*
- * We expect a potential EWOULDBLOCK here, because the
- * chances are the front end has done a select for
- * FD_CONNECT, so that connect() will complete
- * asynchronously.
- */
- if ( err != WSAEWOULDBLOCK ) {
- sock->error = winsock_error_string(err);
- goto ret;
- }
- } else {
- /*
- * If we _don't_ get EWOULDBLOCK, the connect has completed
- * and we should set the socket as writable.
- */
- sock->writable = 1;
- }
-
- err = 0;
-
- ret:
-
- /*
- * No matter what happened, put the socket back in the tree.
- */
- add234(sktree, sock);
-
- if (err)
- plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
- return err;
-}
-
-Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
- int nodelay, int keepalive, Plug plug)
-{
- static const struct socket_function_table fn_table = {
- sk_tcp_plug,
- sk_tcp_close,
- sk_tcp_write,
- sk_tcp_write_oob,
- sk_tcp_write_eof,
- sk_tcp_flush,
- sk_tcp_set_private_ptr,
- sk_tcp_get_private_ptr,
- sk_tcp_set_frozen,
- sk_tcp_socket_error
- };
-
- Actual_Socket ret;
- DWORD err;
-
- /*
- * Create Socket structure.
- */
- ret = snew(struct Socket_tag);
- ret->fn = &fn_table;
- ret->error = NULL;
- ret->plug = plug;
- bufchain_init(&ret->output_data);
- ret->connected = 0; /* to start with */
- ret->writable = 0; /* to start with */
- ret->sending_oob = 0;
- ret->outgoingeof = EOF_NO;
- ret->frozen = 0;
- ret->frozen_readable = 0;
- ret->localhost_only = 0; /* unused, but best init anyway */
- ret->pending_error = 0;
- ret->parent = ret->child = NULL;
- ret->oobinline = oobinline;
- ret->nodelay = nodelay;
- ret->keepalive = keepalive;
- ret->privport = privport;
- ret->port = port;
- ret->addr = addr;
- START_STEP(ret->addr, ret->step);
- ret->s = INVALID_SOCKET;
-
- err = 0;
- do {
- err = try_connect(ret);
- } while (err && sk_nextaddr(ret->addr, &ret->step));
-
- return (Socket) ret;
-}
-
-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,
- sk_tcp_close,
- sk_tcp_write,
- sk_tcp_write_oob,
- sk_tcp_write_eof,
- sk_tcp_flush,
- sk_tcp_set_private_ptr,
- sk_tcp_get_private_ptr,
- sk_tcp_set_frozen,
- sk_tcp_socket_error
- };
-
- SOCKET s;
-#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.
- */
- ret = snew(struct Socket_tag);
- ret->fn = &fn_table;
- ret->error = NULL;
- ret->plug = plug;
- bufchain_init(&ret->output_data);
- ret->writable = 0; /* to start with */
- ret->sending_oob = 0;
- ret->outgoingeof = EOF_NO;
- ret->frozen = 0;
- ret->frozen_readable = 0;
- ret->localhost_only = local_host_only;
- ret->pending_error = 0;
- ret->parent = ret->child = NULL;
- ret->addr = 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(address_family, SOCK_STREAM, 0);
- ret->s = s;
-
- if (s == INVALID_SOCKET) {
- err = p_WSAGetLastError();
- ret->error = winsock_error_string(err);
- return (Socket) ret;
- }
-
- ret->oobinline = 0;
-
- p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
-
-#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. :-)
- * (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
- a6.sin6_addr = in6addr_any;
- a6.sin6_port = p_htons(port);
- } else
-#endif
- {
- int got_addr = 0;
- a.sin_family = AF_INET;
-
- /*
- * Bind to source address. First try an explicitly
- * specified one...
- */
- if (srcaddr) {
- a.sin_addr.s_addr = p_inet_addr(srcaddr);
- if (a.sin_addr.s_addr != INADDR_NONE) {
- /* Override localhost_only with specified listen addr. */
- ret->localhost_only = ipv4_is_loopback(a.sin_addr);
- got_addr = 1;
- }
- }
-
- /*
- * ... and failing that, go with one of the standard ones.
- */
- if (!got_addr) {
- if (local_host_only)
- a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
- else
- a.sin_addr.s_addr = p_htonl(INADDR_ANY);
- }
-
- a.sin_port = p_htons((short)port);
- }
-#ifndef NO_IPV6
- retcode = p_bind(s, (address_family == AF_INET6 ?
- (struct sockaddr *) &a6 :
- (struct sockaddr *) &a),
- (address_family ==
- AF_INET6 ? sizeof(a6) : sizeof(a)));
-#else
- retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
-#endif
- if (retcode != SOCKET_ERROR) {
- err = 0;
- } else {
- err = p_WSAGetLastError();
- }
-
- if (err) {
- p_closesocket(s);
- ret->error = winsock_error_string(err);
- return (Socket) ret;
- }
-
-
- if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
- p_closesocket(s);
- ret->error = winsock_error_string(err);
- return (Socket) ret;
- }
-
- /* Set up a select mechanism. This could be an AsyncSelect on a
- * 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;
-}
-
-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);
- if (s->addr)
- sk_addr_free(s->addr);
- sfree(s);
-}
-
-/*
- * The function which tries to send on a socket once it's deemed
- * writable.
- */
-void try_send(Actual_Socket s)
-{
- while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
- int nsent;
- DWORD err;
- void *data;
- int len, urgentflag;
-
- if (s->sending_oob) {
- urgentflag = MSG_OOB;
- len = s->sending_oob;
- data = &s->oobdata;
- } else {
- urgentflag = 0;
- bufchain_prefix(&s->output_data, &data, &len);
- }
- nsent = p_send(s->s, data, len, urgentflag);
- noise_ultralight(nsent);
- if (nsent <= 0) {
- err = (nsent < 0 ? p_WSAGetLastError() : 0);
- if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
- /*
- * Perfectly normal: we've sent all we can for the moment.
- *
- * (Some WinSock send() implementations can return
- * <0 but leave no sensible error indication -
- * WSAGetLastError() is called but returns zero or
- * a small number - so we check that case and treat
- * it just like WSAEWOULDBLOCK.)
- */
- s->writable = FALSE;
- return;
- } else if (nsent == 0 ||
- err == WSAECONNABORTED || err == WSAECONNRESET) {
- /*
- * If send() returns CONNABORTED or CONNRESET, we
- * unfortunately can't just call plug_closing(),
- * because it's quite likely that we're currently
- * _in_ a call from the code we'd be calling back
- * to, so we'd have to make half the SSH code
- * reentrant. Instead we flag a pending error on
- * the socket, to be dealt with (by calling
- * plug_closing()) at some suitable future moment.
- */
- s->pending_error = err;
- return;
- } else {
- /* We're inside the Windows frontend here, so we know
- * that the frontend handle is unnecessary. */
- logevent(NULL, winsock_error_string(err));
- fatalbox("%s", winsock_error_string(err));
- }
- } else {
- if (s->sending_oob) {
- if (nsent < len) {
- memmove(s->oobdata, s->oobdata+nsent, len-nsent);
- s->sending_oob = len - nsent;
- } else {
- s->sending_oob = 0;
- }
- } else {
- bufchain_consume(&s->output_data, nsent);
- }
- }
- }
-
- /*
- * If we reach here, we've finished sending everything we might
- * have needed to send. Send EOF, if we need to.
- */
- if (s->outgoingeof == EOF_PENDING) {
- p_shutdown(s->s, SD_SEND);
- s->outgoingeof = EOF_SENT;
- }
-}
-
-static int sk_tcp_write(Socket sock, const char *buf, int len)
-{
- Actual_Socket s = (Actual_Socket) sock;
-
- assert(s->outgoingeof == EOF_NO);
-
- /*
- * Add the data to the buffer list on the socket.
- */
- bufchain_add(&s->output_data, buf, len);
-
- /*
- * Now try sending from the start of the buffer list.
- */
- if (s->writable)
- try_send(s);
-
- return bufchain_size(&s->output_data);
-}
-
-static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
-{
- Actual_Socket s = (Actual_Socket) sock;
-
- assert(s->outgoingeof == EOF_NO);
-
- /*
- * Replace the buffer list on the socket with the data.
- */
- bufchain_clear(&s->output_data);
- assert(len <= sizeof(s->oobdata));
- memcpy(s->oobdata, buf, len);
- s->sending_oob = len;
-
- /*
- * Now try sending from the start of the buffer list.
- */
- if (s->writable)
- try_send(s);
-
- return s->sending_oob;
-}
-
-static void sk_tcp_write_eof(Socket sock)
-{
- Actual_Socket s = (Actual_Socket) sock;
-
- assert(s->outgoingeof == EOF_NO);
-
- /*
- * Mark the socket as pending outgoing EOF.
- */
- s->outgoingeof = EOF_PENDING;
-
- /*
- * Now try sending from the start of the buffer list.
- */
- if (s->writable)
- try_send(s);
-}
-
-int select_result(WPARAM wParam, LPARAM lParam)
-{
- int ret, open;
- DWORD err;
- char buf[20480]; /* nice big buffer for plenty of speed */
- Actual_Socket s;
- u_long atmark;
-
- /* wParam is the socket itself */
-
- if (wParam == 0)
- return 1; /* boggle */
-
- s = find234(sktree, (void *) wParam, cmpforsearch);
- if (!s)
- return 1; /* boggle */
-
- if ((err = WSAGETSELECTERROR(lParam)) != 0) {
- /*
- * An error has occurred on this socket. Pass it to the
- * plug.
- */
- if (s->addr) {
- plug_log(s->plug, 1, s->addr, s->port,
- winsock_error_string(err), err);
- while (s->addr && sk_nextaddr(s->addr, &s->step)) {
- err = try_connect(s);
- }
- }
- if (err != 0)
- return plug_closing(s->plug, winsock_error_string(err), err, 0);
- else
- return 1;
- }
-
- noise_ultralight(lParam);
-
- switch (WSAGETSELECTEVENT(lParam)) {
- case FD_CONNECT:
- s->connected = s->writable = 1;
- /*
- * Once a socket is connected, we can stop falling
- * back through the candidate addresses to connect
- * to.
- */
- if (s->addr) {
- sk_addr_free(s->addr);
- s->addr = NULL;
- }
- break;
- case FD_READ:
- /* In the case the socket is still frozen, we don't even bother */
- if (s->frozen) {
- s->frozen_readable = 1;
- break;
- }
-
- /*
- * We have received data on the socket. For an oobinline
- * socket, this might be data _before_ an urgent pointer,
- * in which case we send it to the back end with type==1
- * (data prior to urgent).
- */
- if (s->oobinline) {
- atmark = 1;
- p_ioctlsocket(s->s, SIOCATMARK, &atmark);
- /*
- * Avoid checking the return value from ioctlsocket(),
- * on the grounds that some WinSock wrappers don't
- * support it. If it does nothing, we get atmark==1,
- * which is equivalent to `no OOB pending', so the
- * effect will be to non-OOB-ify any OOB data.
- */
- } else
- atmark = 1;
-
- ret = p_recv(s->s, buf, sizeof(buf), 0);
- noise_ultralight(ret);
- if (ret < 0) {
- err = p_WSAGetLastError();
- if (err == WSAEWOULDBLOCK) {
- break;
- }
- }
- if (ret < 0) {
- return plug_closing(s->plug, winsock_error_string(err), err,
- 0);
- } else if (0 == ret) {
- return plug_closing(s->plug, NULL, 0, 0);
- } else {
- return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
- }
- break;
- case FD_OOB:
- /*
- * This will only happen on a non-oobinline socket. It
- * indicates that we can immediately perform an OOB read
- * and get back OOB data, which we will send to the back
- * end with type==2 (urgent data).
- */
- ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
- noise_ultralight(ret);
- if (ret <= 0) {
- char *str = (ret == 0 ? "Internal networking trouble" :
- winsock_error_string(p_WSAGetLastError()));
- /* We're inside the Windows frontend here, so we know
- * that the frontend handle is unnecessary. */
- logevent(NULL, str);
- fatalbox("%s", str);
- } else {
- return plug_receive(s->plug, 2, buf, ret);
- }
- break;
- case FD_WRITE:
- {
- int bufsize_before, bufsize_after;
- s->writable = 1;
- bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
- try_send(s);
- bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
- if (bufsize_after < bufsize_before)
- plug_sent(s->plug, bufsize_after);
- }
- break;
- case FD_CLOSE:
- /* Signal a close on the socket. First read any outstanding data. */
- open = 1;
- do {
- ret = p_recv(s->s, buf, sizeof(buf), 0);
- if (ret < 0) {
- err = p_WSAGetLastError();
- if (err == WSAEWOULDBLOCK)
- break;
- return plug_closing(s->plug, winsock_error_string(err),
- err, 0);
- } else {
- if (ret)
- open &= plug_receive(s->plug, 0, buf, ret);
- else
- open &= plug_closing(s->plug, NULL, 0, 0);
- }
- } while (ret > 0);
- return open;
- case FD_ACCEPT:
- {
-#ifdef NO_IPV6
- struct sockaddr_in isa;
-#else
- struct sockaddr_storage isa;
-#endif
- int addrlen = sizeof(isa);
- SOCKET t; /* socket of connection */
-
- memset(&isa, 0, sizeof(isa));
- err = 0;
- t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
- if (t == INVALID_SOCKET)
- {
- err = p_WSAGetLastError();
- 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 */
- }
- }
- }
-
- return 1;
-}
-
-/*
- * Deal with socket errors detected in try_send().
- */
-void net_pending_errors(void)
-{
- int i;
- Actual_Socket s;
-
- /*
- * This might be a fiddly business, because it's just possible
- * that handling a pending error on one socket might cause
- * others to be closed. (I can't think of any reason this might
- * happen in current SSH implementation, but to maintain
- * generality of this network layer I'll assume the worst.)
- *
- * So what we'll do is search the socket list for _one_ socket
- * with a pending error, and then handle it, and then search
- * the list again _from the beginning_. Repeat until we make a
- * pass with no socket errors present. That way we are
- * protected against the socket list changing under our feet.
- */
-
- do {
- for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
- if (s->pending_error) {
- /*
- * An error has occurred on this socket. Pass it to the
- * plug.
- */
- plug_closing(s->plug,
- winsock_error_string(s->pending_error),
- s->pending_error, 0);
- break;
- }
- }
- } while (s);
-}
-
-/*
- * Each socket abstraction contains a `void *' private field in
- * which the client can keep state.
- */
-static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
-{
- Actual_Socket s = (Actual_Socket) sock;
- s->private_ptr = ptr;
-}
-
-static void *sk_tcp_get_private_ptr(Socket sock)
-{
- Actual_Socket s = (Actual_Socket) sock;
- return s->private_ptr;
-}
-
-/*
- * Special error values are returned from sk_namelookup and sk_new
- * if there's a problem. These functions extract an error message,
- * or return NULL if there's no problem.
- */
-const char *sk_addr_error(SockAddr addr)
-{
- return addr->error;
-}
-static const char *sk_tcp_socket_error(Socket sock)
-{
- Actual_Socket s = (Actual_Socket) sock;
- return s->error;
-}
-
-static void sk_tcp_set_frozen(Socket sock, int is_frozen)
-{
- Actual_Socket s = (Actual_Socket) sock;
- if (s->frozen == is_frozen)
- return;
- s->frozen = is_frozen;
- if (!is_frozen) {
- do_select(s->s, 1);
- if (s->frozen_readable) {
- char c;
- p_recv(s->s, &c, 1, MSG_PEEK);
- }
- }
- s->frozen_readable = 0;
-}
-
-void socket_reselect_all(void)
-{
- Actual_Socket s;
- int i;
-
- for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
- if (!s->frozen)
- do_select(s->s, 1);
- }
-}
-
-/*
- * For Plink: enumerate all sockets currently active.
- */
-SOCKET first_socket(int *state)
-{
- Actual_Socket s;
- *state = 0;
- s = index234(sktree, (*state)++);
- return s ? s->s : INVALID_SOCKET;
-}
-
-SOCKET next_socket(int *state)
-{
- Actual_Socket s = index234(sktree, (*state)++);
- return s ? s->s : INVALID_SOCKET;
-}
-
-extern int socket_writable(SOCKET skt)
-{
- Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
-
- if (s)
- return bufchain_size(&s->output_data) > 0;
- else
- return 0;
-}
-
-int net_service_lookup(char *service)
-{
- struct servent *se;
- se = p_getservbyname(service, NULL);
- if (se != NULL)
- return p_ntohs(se->s_port);
- else
- return 0;
-}
-
-char *get_hostname(void)
-{
- int len = 128;
- char *hostname = NULL;
- do {
- len *= 2;
- hostname = sresize(hostname, len, char);
- if (p_gethostname(hostname, len) < 0) {
- sfree(hostname);
- hostname = NULL;
- break;
- }
- } while (strlen(hostname) >= (size_t)(len-1));
- return hostname;
-}
-
-SockAddr platform_get_x11_unix_address(const char *display, int displaynum,
- char **canonicalname)
-{
- SockAddr ret = snew(struct SockAddr_tag);
- memset(ret, 0, sizeof(struct SockAddr_tag));
- ret->error = "unix sockets not supported on this platform";
- ret->refcount = 1;
- return ret;
-}
+/*
+ * Windows networking abstraction.
+ *
+ * For the IPv6 code in here I am indebted to Jeroen Massar and
+ * unfix.org.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#define DEFINE_PLUG_METHOD_MACROS
+#include "putty.h"
+#include "network.h"
+#include "tree234.h"
+
+#include <ws2tcpip.h>
+
+#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;
+
+/*
+ * Mutable state that goes with a SockAddr: stores information
+ * about where in the list of candidate IP(v*) addresses we've
+ * currently got to.
+ */
+typedef struct SockAddrStep_tag SockAddrStep;
+struct SockAddrStep_tag {
+#ifndef NO_IPV6
+ struct addrinfo *ai; /* steps along addr->ais */
+#endif
+ int curraddr;
+};
+
+struct Socket_tag {
+ const struct socket_function_table *fn;
+ /* the above variable absolutely *must* be the first in this structure */
+ char *error;
+ SOCKET s;
+ Plug plug;
+ bufchain output_data;
+ int connected;
+ int writable;
+ int frozen; /* this causes readability notifications to be ignored */
+ int frozen_readable; /* this means we missed at least one readability
+ * notification while we were frozen */
+ int localhost_only; /* for listening sockets */
+ char oobdata[1];
+ int sending_oob;
+ int oobinline, nodelay, keepalive, privport;
+ enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
+ SockAddr addr;
+ SockAddrStep step;
+ int port;
+ 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;
+};
+
+struct SockAddr_tag {
+ int refcount;
+ char *error;
+ int resolved;
+ int namedpipe; /* indicates that this SockAddr is phony, holding a Windows
+ * named pipe pathname instead of a network address */
+#ifndef NO_IPV6
+ struct addrinfo *ais; /* Addresses IPv6 style. */
+#endif
+ unsigned long *addresses; /* Addresses IPv4 style. */
+ int naddresses;
+ char hostname[512]; /* Store an unresolved host name. */
+};
+
+/*
+ * Which address family this address belongs to. AF_INET for 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.
+ */
+#ifndef NO_IPV6
+#define SOCKADDR_FAMILY(addr, step) \
+ (!(addr)->resolved ? AF_UNSPEC : \
+ (step).ai ? (step).ai->ai_family : AF_INET)
+#else
+#define SOCKADDR_FAMILY(addr, step) \
+ (!(addr)->resolved ? AF_UNSPEC : AF_INET)
+#endif
+
+/*
+ * Start a SockAddrStep structure to step through multiple
+ * addresses.
+ */
+#ifndef NO_IPV6
+#define START_STEP(addr, step) \
+ ((step).ai = (addr)->ais, (step).curraddr = 0)
+#else
+#define START_STEP(addr, step) \
+ ((step).curraddr = 0)
+#endif
+
+static tree234 *sktree;
+
+static int cmpfortree(void *av, void *bv)
+{
+ Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
+ unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
+ if (as < bs)
+ return -1;
+ if (as > bs)
+ return +1;
+ if (a < b)
+ return -1;
+ if (a > b)
+ return +1;
+ return 0;
+}
+
+static int cmpforsearch(void *av, void *bv)
+{
+ Actual_Socket b = (Actual_Socket) bv;
+ unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
+ if (as < bs)
+ return -1;
+ if (as > bs)
+ return +1;
+ return 0;
+}
+
+DECL_WINDOWS_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
+DECL_WINDOWS_FUNCTION(static, int, WSACleanup, (void));
+DECL_WINDOWS_FUNCTION(static, int, closesocket, (SOCKET));
+DECL_WINDOWS_FUNCTION(static, u_long, ntohl, (u_long));
+DECL_WINDOWS_FUNCTION(static, u_long, htonl, (u_long));
+DECL_WINDOWS_FUNCTION(static, u_short, htons, (u_short));
+DECL_WINDOWS_FUNCTION(static, u_short, ntohs, (u_short));
+DECL_WINDOWS_FUNCTION(static, int, gethostname, (char *, int));
+DECL_WINDOWS_FUNCTION(static, struct hostent FAR *, gethostbyname,
+ (const char FAR *));
+DECL_WINDOWS_FUNCTION(static, struct servent FAR *, getservbyname,
+ (const char FAR *, const char FAR *));
+DECL_WINDOWS_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
+DECL_WINDOWS_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
+DECL_WINDOWS_FUNCTION(static, int, connect,
+ (SOCKET, const struct sockaddr FAR *, int));
+DECL_WINDOWS_FUNCTION(static, int, bind,
+ (SOCKET, const struct sockaddr FAR *, int));
+DECL_WINDOWS_FUNCTION(static, int, setsockopt,
+ (SOCKET, int, int, const char FAR *, int));
+DECL_WINDOWS_FUNCTION(static, SOCKET, socket, (int, int, int));
+DECL_WINDOWS_FUNCTION(static, int, listen, (SOCKET, int));
+DECL_WINDOWS_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
+DECL_WINDOWS_FUNCTION(static, int, shutdown, (SOCKET, int));
+DECL_WINDOWS_FUNCTION(static, int, ioctlsocket,
+ (SOCKET, long, u_long FAR *));
+DECL_WINDOWS_FUNCTION(static, SOCKET, accept,
+ (SOCKET, struct sockaddr FAR *, int FAR *));
+DECL_WINDOWS_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
+DECL_WINDOWS_FUNCTION(static, int, WSAIoctl,
+ (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
+ LPDWORD, LPWSAOVERLAPPED,
+ LPWSAOVERLAPPED_COMPLETION_ROUTINE));
+#ifndef NO_IPV6
+DECL_WINDOWS_FUNCTION(static, int, getaddrinfo,
+ (const char *nodename, const char *servname,
+ const struct addrinfo *hints, struct addrinfo **res));
+DECL_WINDOWS_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
+DECL_WINDOWS_FUNCTION(static, int, getnameinfo,
+ (const struct sockaddr FAR * sa, socklen_t salen,
+ char FAR * host, size_t hostlen, char FAR * serv,
+ size_t servlen, int flags));
+DECL_WINDOWS_FUNCTION(static, char *, gai_strerror, (int ecode));
+DECL_WINDOWS_FUNCTION(static, int, WSAAddressToStringA,
+ (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO,
+ LPSTR, LPDWORD));
+#endif
+
+static HMODULE winsock_module = NULL;
+static WSADATA wsadata;
+#ifndef NO_IPV6
+static HMODULE winsock2_module = NULL;
+static HMODULE wship6_module = NULL;
+#endif
+
+int sk_startup(int hi, int lo)
+{
+ WORD winsock_ver;
+
+ winsock_ver = MAKEWORD(hi, lo);
+
+ if (p_WSAStartup(winsock_ver, &wsadata)) {
+ return FALSE;
+ }
+
+ if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
+ return FALSE;
+ }
+
+#ifdef NET_SETUP_DIAGNOSTICS
+ {
+ char buf[80];
+ sprintf(buf, "Using WinSock %d.%d", hi, lo);
+ logevent(NULL, buf);
+ }
+#endif
+ return TRUE;
+}
+
+void sk_init(void)
+{
+#ifndef NO_IPV6
+ winsock2_module =
+#endif
+ winsock_module = load_system32_dll("ws2_32.dll");
+ if (!winsock_module) {
+ winsock_module = load_system32_dll("wsock32.dll");
+ }
+ if (!winsock_module)
+ fatalbox("Unable to load any WinSock library");
+
+#ifndef NO_IPV6
+ /* Check if we have getaddrinfo in Winsock */
+ if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
+#ifdef NET_SETUP_DIAGNOSTICS
+ logevent(NULL, "Native WinSock IPv6 support detected");
+#endif
+ GET_WINDOWS_FUNCTION(winsock_module, getaddrinfo);
+ GET_WINDOWS_FUNCTION(winsock_module, freeaddrinfo);
+ GET_WINDOWS_FUNCTION(winsock_module, getnameinfo);
+ GET_WINDOWS_FUNCTION(winsock_module, gai_strerror);
+ } else {
+ /* Fall back to wship6.dll for Windows 2000 */
+ wship6_module = load_system32_dll("wship6.dll");
+ if (wship6_module) {
+#ifdef NET_SETUP_DIAGNOSTICS
+ logevent(NULL, "WSH IPv6 support detected");
+#endif
+ GET_WINDOWS_FUNCTION(wship6_module, getaddrinfo);
+ GET_WINDOWS_FUNCTION(wship6_module, freeaddrinfo);
+ GET_WINDOWS_FUNCTION(wship6_module, getnameinfo);
+ GET_WINDOWS_FUNCTION(wship6_module, gai_strerror);
+ } else {
+#ifdef NET_SETUP_DIAGNOSTICS
+ logevent(NULL, "No IPv6 support detected");
+#endif
+ }
+ }
+ GET_WINDOWS_FUNCTION(winsock2_module, WSAAddressToStringA);
+#else
+#ifdef NET_SETUP_DIAGNOSTICS
+ logevent(NULL, "PuTTY was built without IPv6 support");
+#endif
+#endif
+
+ GET_WINDOWS_FUNCTION(winsock_module, WSAAsyncSelect);
+ GET_WINDOWS_FUNCTION(winsock_module, WSAEventSelect);
+ GET_WINDOWS_FUNCTION(winsock_module, select);
+ GET_WINDOWS_FUNCTION(winsock_module, WSAGetLastError);
+ GET_WINDOWS_FUNCTION(winsock_module, WSAEnumNetworkEvents);
+ GET_WINDOWS_FUNCTION(winsock_module, WSAStartup);
+ GET_WINDOWS_FUNCTION(winsock_module, WSACleanup);
+ GET_WINDOWS_FUNCTION(winsock_module, closesocket);
+ GET_WINDOWS_FUNCTION(winsock_module, ntohl);
+ GET_WINDOWS_FUNCTION(winsock_module, htonl);
+ GET_WINDOWS_FUNCTION(winsock_module, htons);
+ GET_WINDOWS_FUNCTION(winsock_module, ntohs);
+ GET_WINDOWS_FUNCTION(winsock_module, gethostname);
+ GET_WINDOWS_FUNCTION(winsock_module, gethostbyname);
+ GET_WINDOWS_FUNCTION(winsock_module, getservbyname);
+ GET_WINDOWS_FUNCTION(winsock_module, inet_addr);
+ GET_WINDOWS_FUNCTION(winsock_module, inet_ntoa);
+ GET_WINDOWS_FUNCTION(winsock_module, connect);
+ GET_WINDOWS_FUNCTION(winsock_module, bind);
+ GET_WINDOWS_FUNCTION(winsock_module, setsockopt);
+ GET_WINDOWS_FUNCTION(winsock_module, socket);
+ GET_WINDOWS_FUNCTION(winsock_module, listen);
+ GET_WINDOWS_FUNCTION(winsock_module, send);
+ GET_WINDOWS_FUNCTION(winsock_module, shutdown);
+ GET_WINDOWS_FUNCTION(winsock_module, ioctlsocket);
+ GET_WINDOWS_FUNCTION(winsock_module, accept);
+ GET_WINDOWS_FUNCTION(winsock_module, recv);
+ GET_WINDOWS_FUNCTION(winsock_module, WSAIoctl);
+
+ /* Try to get the best WinSock version we can get */
+ if (!sk_startup(2,2) &&
+ !sk_startup(2,0) &&
+ !sk_startup(1,1)) {
+ fatalbox("Unable to initialise WinSock");
+ }
+
+ sktree = newtree234(cmpfortree);
+}
+
+void sk_cleanup(void)
+{
+ Actual_Socket s;
+ int i;
+
+ if (sktree) {
+ for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
+ p_closesocket(s->s);
+ }
+ freetree234(sktree);
+ sktree = NULL;
+ }
+
+ if (p_WSACleanup)
+ p_WSACleanup();
+ if (winsock_module)
+ FreeLibrary(winsock_module);
+#ifndef NO_IPV6
+ if (wship6_module)
+ FreeLibrary(wship6_module);
+#endif
+}
+
+struct errstring {
+ int error;
+ char *text;
+};
+
+static int errstring_find(void *av, void *bv)
+{
+ int *a = (int *)av;
+ struct errstring *b = (struct errstring *)bv;
+ if (*a < b->error)
+ return -1;
+ if (*a > b->error)
+ return +1;
+ return 0;
+}
+static int errstring_compare(void *av, void *bv)
+{
+ struct errstring *a = (struct errstring *)av;
+ return errstring_find(&a->error, bv);
+}
+
+static tree234 *errstrings = NULL;
+
+char *winsock_error_string(int error)
+{
+ const char prefix[] = "Network error: ";
+ struct errstring *es;
+
+ /*
+ * Error codes we know about and have historically had reasonably
+ * sensible error messages for.
+ */
+ switch (error) {
+ case WSAEACCES:
+ return "Network error: Permission denied";
+ case WSAEADDRINUSE:
+ return "Network error: Address already in use";
+ case WSAEADDRNOTAVAIL:
+ return "Network error: Cannot assign requested address";
+ case WSAEAFNOSUPPORT:
+ return
+ "Network error: Address family not supported by protocol family";
+ case WSAEALREADY:
+ return "Network error: Operation already in progress";
+ case WSAECONNABORTED:
+ return "Network error: Software caused connection abort";
+ case WSAECONNREFUSED:
+ return "Network error: Connection refused";
+ case WSAECONNRESET:
+ return "Network error: Connection reset by peer";
+ case WSAEDESTADDRREQ:
+ return "Network error: Destination address required";
+ case WSAEFAULT:
+ return "Network error: Bad address";
+ case WSAEHOSTDOWN:
+ return "Network error: Host is down";
+ case WSAEHOSTUNREACH:
+ return "Network error: No route to host";
+ case WSAEINPROGRESS:
+ return "Network error: Operation now in progress";
+ case WSAEINTR:
+ return "Network error: Interrupted function call";
+ case WSAEINVAL:
+ return "Network error: Invalid argument";
+ case WSAEISCONN:
+ return "Network error: Socket is already connected";
+ case WSAEMFILE:
+ return "Network error: Too many open files";
+ case WSAEMSGSIZE:
+ return "Network error: Message too long";
+ case WSAENETDOWN:
+ return "Network error: Network is down";
+ case WSAENETRESET:
+ return "Network error: Network dropped connection on reset";
+ case WSAENETUNREACH:
+ return "Network error: Network is unreachable";
+ case WSAENOBUFS:
+ return "Network error: No buffer space available";
+ case WSAENOPROTOOPT:
+ return "Network error: Bad protocol option";
+ case WSAENOTCONN:
+ return "Network error: Socket is not connected";
+ case WSAENOTSOCK:
+ return "Network error: Socket operation on non-socket";
+ case WSAEOPNOTSUPP:
+ return "Network error: Operation not supported";
+ case WSAEPFNOSUPPORT:
+ return "Network error: Protocol family not supported";
+ case WSAEPROCLIM:
+ return "Network error: Too many processes";
+ case WSAEPROTONOSUPPORT:
+ return "Network error: Protocol not supported";
+ case WSAEPROTOTYPE:
+ return "Network error: Protocol wrong type for socket";
+ case WSAESHUTDOWN:
+ return "Network error: Cannot send after socket shutdown";
+ case WSAESOCKTNOSUPPORT:
+ return "Network error: Socket type not supported";
+ case WSAETIMEDOUT:
+ return "Network error: Connection timed out";
+ case WSAEWOULDBLOCK:
+ return "Network error: Resource temporarily unavailable";
+ case WSAEDISCON:
+ return "Network error: Graceful shutdown in progress";
+ }
+
+ /*
+ * Generic code to handle any other error.
+ *
+ * Slightly nasty hack here: we want to return a static string
+ * which the caller will never have to worry about freeing, but on
+ * the other hand if we call FormatMessage to get it then it will
+ * want to either allocate a buffer or write into one we own.
+ *
+ * So what we do is to maintain a tree234 of error strings we've
+ * already used. New ones are allocated from the heap, but then
+ * put in this tree and kept forever.
+ */
+
+ if (!errstrings)
+ errstrings = newtree234(errstring_compare);
+
+ es = find234(errstrings, &error, errstring_find);
+
+ if (!es) {
+ int bufsize, bufused;
+
+ es = snew(struct errstring);
+ es->error = error;
+ /* maximum size for FormatMessage is 64K */
+ bufsize = 65535 + sizeof(prefix);
+ es->text = snewn(bufsize, char);
+ strcpy(es->text, prefix);
+ bufused = strlen(es->text);
+ if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM |
+ FORMAT_MESSAGE_IGNORE_INSERTS), NULL, error,
+ MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+ es->text + bufused, bufsize - bufused, NULL)) {
+ sprintf(es->text + bufused,
+ "Windows error code %d (and FormatMessage returned %d)",
+ error, GetLastError());
+ } else {
+ int len = strlen(es->text);
+ if (len > 0 && es->text[len-1] == '\n')
+ es->text[len-1] = '\0';
+ }
+ es->text = sresize(es->text, strlen(es->text) + 1, char);
+ add234(errstrings, es);
+ }
+
+ return es->text;
+}
+
+SockAddr sk_namelookup(const char *host, char **canonicalname,
+ int address_family)
+{
+ SockAddr ret = snew(struct SockAddr_tag);
+ unsigned long a;
+ char realhost[8192];
+ int hint_family;
+
+ /* Default to IPv4. */
+ hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
+#ifndef NO_IPV6
+ address_family == ADDRTYPE_IPV6 ? AF_INET6 :
+#endif
+ AF_UNSPEC);
+
+ /* Clear the structure and default to IPv4. */
+ memset(ret, 0, sizeof(struct SockAddr_tag));
+#ifndef NO_IPV6
+ ret->ais = NULL;
+#endif
+ ret->namedpipe = FALSE;
+ ret->addresses = NULL;
+ ret->resolved = FALSE;
+ ret->refcount = 1;
+ *realhost = '\0';
+
+ if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
+ struct hostent *h = NULL;
+ int err;
+#ifndef NO_IPV6
+ /*
+ * Use getaddrinfo when it's available
+ */
+ if (p_getaddrinfo) {
+ struct addrinfo hints;
+#ifdef NET_SETUP_DIAGNOSTICS
+ logevent(NULL, "Using getaddrinfo() for resolving");
+#endif
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = hint_family;
+ hints.ai_flags = AI_CANONNAME;
+ {
+ /* strip [] on IPv6 address literals */
+ char *trimmed_host = host_strduptrim(host);
+ err = p_getaddrinfo(trimmed_host, NULL, &hints, &ret->ais);
+ sfree(trimmed_host);
+ }
+ if (err == 0)
+ ret->resolved = TRUE;
+ } else
+#endif
+ {
+#ifdef NET_SETUP_DIAGNOSTICS
+ logevent(NULL, "Using gethostbyname() for resolving");
+#endif
+ /*
+ * Otherwise use the IPv4-only gethostbyname...
+ * (NOTE: we don't use gethostbyname as a fallback!)
+ */
+ if ( (h = p_gethostbyname(host)) )
+ ret->resolved = TRUE;
+ else
+ err = p_WSAGetLastError();
+ }
+
+ if (!ret->resolved) {
+ ret->error = (err == WSAENETDOWN ? "Network is down" :
+ err == WSAHOST_NOT_FOUND ? "Host does not exist" :
+ err == WSATRY_AGAIN ? "Host not found" :
+#ifndef NO_IPV6
+ p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) :
+#endif
+ "gethostbyname: unknown error");
+ } else {
+ ret->error = NULL;
+
+#ifndef NO_IPV6
+ /* If we got an address info use that... */
+ if (ret->ais) {
+ /* 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->ais->ai_family == AF_INET)
+ memcpy(&a,
+ (char *) &((SOCKADDR_IN *) ret->ais->
+ ai_addr)->sin_addr, sizeof(a));
+
+ if (ret->ais->ai_canonname)
+ strncpy(realhost, ret->ais->ai_canonname, lenof(realhost));
+ else
+ strncpy(realhost, host, lenof(realhost));
+ }
+ /* We used the IPv4-only gethostbyname()... */
+ else
+#endif
+ {
+ int n;
+ for (n = 0; h->h_addr_list[n]; n++);
+ ret->addresses = snewn(n, unsigned long);
+ ret->naddresses = n;
+ for (n = 0; n < ret->naddresses; n++) {
+ memcpy(&a, h->h_addr_list[n], sizeof(a));
+ ret->addresses[n] = p_ntohl(a);
+ }
+ memcpy(&a, h->h_addr, sizeof(a));
+ /* This way we are always sure the h->h_name is valid :) */
+ strncpy(realhost, h->h_name, sizeof(realhost));
+ }
+ }
+ } else {
+ /*
+ * This must be a numeric IPv4 address because it caused a
+ * success return from inet_addr.
+ */
+ ret->addresses = snewn(1, unsigned long);
+ ret->naddresses = 1;
+ ret->addresses[0] = p_ntohl(a);
+ ret->resolved = TRUE;
+ strncpy(realhost, host, sizeof(realhost));
+ }
+ realhost[lenof(realhost)-1] = '\0';
+ *canonicalname = snewn(1+strlen(realhost), char);
+ strcpy(*canonicalname, realhost);
+ return ret;
+}
+
+SockAddr sk_nonamelookup(const char *host)
+{
+ SockAddr ret = snew(struct SockAddr_tag);
+ ret->error = NULL;
+ ret->resolved = FALSE;
+#ifndef NO_IPV6
+ ret->ais = NULL;
+#endif
+ ret->namedpipe = FALSE;
+ ret->addresses = NULL;
+ ret->naddresses = 0;
+ ret->refcount = 1;
+ strncpy(ret->hostname, host, lenof(ret->hostname));
+ ret->hostname[lenof(ret->hostname)-1] = '\0';
+ return ret;
+}
+
+SockAddr sk_namedpipe_addr(const char *pipename)
+{
+ SockAddr ret = snew(struct SockAddr_tag);
+ ret->error = NULL;
+ ret->resolved = FALSE;
+#ifndef NO_IPV6
+ ret->ais = NULL;
+#endif
+ ret->namedpipe = TRUE;
+ ret->addresses = NULL;
+ ret->naddresses = 0;
+ ret->refcount = 1;
+ strncpy(ret->hostname, pipename, lenof(ret->hostname));
+ ret->hostname[lenof(ret->hostname)-1] = '\0';
+ return ret;
+}
+
+int sk_nextaddr(SockAddr addr, SockAddrStep *step)
+{
+#ifndef NO_IPV6
+ if (step->ai) {
+ if (step->ai->ai_next) {
+ step->ai = step->ai->ai_next;
+ return TRUE;
+ } else
+ return FALSE;
+ }
+#endif
+ if (step->curraddr+1 < addr->naddresses) {
+ step->curraddr++;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+void sk_getaddr(SockAddr addr, char *buf, int buflen)
+{
+ SockAddrStep step;
+ START_STEP(addr, step);
+
+#ifndef NO_IPV6
+ if (step.ai) {
+ int err = 0;
+ if (p_WSAAddressToStringA) {
+ DWORD dwbuflen = buflen;
+ err = p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen,
+ NULL, buf, &dwbuflen);
+ } else
+ err = -1;
+ if (err) {
+ strncpy(buf, addr->hostname, buflen);
+ if (!buf[0])
+ strncpy(buf, "<unknown>", buflen);
+ buf[buflen-1] = '\0';
+ }
+ } else
+#endif
+ if (SOCKADDR_FAMILY(addr, step) == AF_INET) {
+ struct in_addr a;
+ assert(addr->addresses && step.curraddr < addr->naddresses);
+ a.s_addr = p_htonl(addr->addresses[step.curraddr]);
+ strncpy(buf, p_inet_ntoa(a), buflen);
+ buf[buflen-1] = '\0';
+ } else {
+ strncpy(buf, addr->hostname, buflen);
+ buf[buflen-1] = '\0';
+ }
+}
+
+int sk_addr_needs_port(SockAddr addr)
+{
+ return addr->namedpipe ? FALSE : TRUE;
+}
+
+int sk_hostname_is_local(const char *name)
+{
+ return !strcmp(name, "localhost") ||
+ !strcmp(name, "::1") ||
+ !strncmp(name, "127.", 4);
+}
+
+static INTERFACE_INFO local_interfaces[16];
+static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
+
+static int ipv4_is_local_addr(struct in_addr addr)
+{
+ if (ipv4_is_loopback(addr))
+ return 1; /* loopback addresses are local */
+ if (!n_local_interfaces) {
+ SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
+ DWORD retbytes;
+
+ if (p_WSAIoctl &&
+ p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
+ local_interfaces, sizeof(local_interfaces),
+ &retbytes, NULL, NULL) == 0)
+ n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
+ else
+ logevent(NULL, "Unable to get list of local IP addresses");
+ }
+ if (n_local_interfaces > 0) {
+ int i;
+ for (i = 0; i < n_local_interfaces; i++) {
+ SOCKADDR_IN *address =
+ (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
+ if (address->sin_addr.s_addr == addr.s_addr)
+ return 1; /* this address is local */
+ }
+ }
+ return 0; /* this address is not local */
+}
+
+int sk_address_is_local(SockAddr addr)
+{
+ SockAddrStep step;
+ int family;
+ START_STEP(addr, step);
+ family = SOCKADDR_FAMILY(addr, step);
+
+#ifndef NO_IPV6
+ if (family == AF_INET6) {
+ return IN6_IS_ADDR_LOOPBACK(&((const struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr);
+ } else
+#endif
+ if (family == AF_INET) {
+#ifndef NO_IPV6
+ if (step.ai) {
+ return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr)
+ ->sin_addr);
+ } else
+#endif
+ {
+ struct in_addr a;
+ assert(addr->addresses && step.curraddr < addr->naddresses);
+ a.s_addr = p_htonl(addr->addresses[step.curraddr]);
+ return ipv4_is_local_addr(a);
+ }
+ } else {
+ assert(family == AF_UNSPEC);
+ return 0; /* we don't know; assume not */
+ }
+}
+
+int sk_address_is_special_local(SockAddr addr)
+{
+ return 0; /* no Unix-domain socket analogue here */
+}
+
+int sk_addrtype(SockAddr addr)
+{
+ SockAddrStep step;
+ int family;
+ START_STEP(addr, step);
+ family = SOCKADDR_FAMILY(addr, step);
+
+ return (family == AF_INET ? ADDRTYPE_IPV4 :
+#ifndef NO_IPV6
+ family == AF_INET6 ? ADDRTYPE_IPV6 :
+#endif
+ ADDRTYPE_NAME);
+}
+
+void sk_addrcopy(SockAddr addr, char *buf)
+{
+ SockAddrStep step;
+ int family;
+ START_STEP(addr, step);
+ family = SOCKADDR_FAMILY(addr, step);
+
+ assert(family != AF_UNSPEC);
+#ifndef NO_IPV6
+ if (step.ai) {
+ if (family == AF_INET)
+ memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
+ sizeof(struct in_addr));
+ else if (family == AF_INET6)
+ memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
+ sizeof(struct in6_addr));
+ else
+ assert(FALSE);
+ } else
+#endif
+ if (family == AF_INET) {
+ struct in_addr a;
+ assert(addr->addresses && step.curraddr < addr->naddresses);
+ a.s_addr = p_htonl(addr->addresses[step.curraddr]);
+ memcpy(buf, (char*) &a.s_addr, 4);
+ }
+}
+
+void sk_addr_free(SockAddr addr)
+{
+ if (--addr->refcount > 0)
+ return;
+#ifndef NO_IPV6
+ if (addr->ais && p_freeaddrinfo)
+ p_freeaddrinfo(addr->ais);
+#endif
+ if (addr->addresses)
+ sfree(addr->addresses);
+ sfree(addr);
+}
+
+SockAddr sk_addr_dup(SockAddr addr)
+{
+ addr->refcount++;
+ return addr;
+}
+
+static Plug sk_tcp_plug(Socket sock, Plug p)
+{
+ Actual_Socket s = (Actual_Socket) sock;
+ Plug ret = s->plug;
+ if (p)
+ s->plug = p;
+ return ret;
+}
+
+static void sk_tcp_flush(Socket s)
+{
+ /*
+ * We send data to the socket as soon as we can anyway,
+ * so we don't need to do anything here. :-)
+ */
+}
+
+static void sk_tcp_close(Socket s);
+static int sk_tcp_write(Socket s, const char *data, int len);
+static int sk_tcp_write_oob(Socket s, const char *data, int len);
+static void sk_tcp_write_eof(Socket s);
+static void sk_tcp_set_frozen(Socket s, int is_frozen);
+static const char *sk_tcp_socket_error(Socket s);
+
+extern char *do_select(SOCKET skt, int startup);
+
+static Socket sk_tcp_accept(accept_ctx_t ctx, Plug plug)
+{
+ static const struct socket_function_table fn_table = {
+ sk_tcp_plug,
+ sk_tcp_close,
+ sk_tcp_write,
+ sk_tcp_write_oob,
+ sk_tcp_write_eof,
+ sk_tcp_flush,
+ sk_tcp_set_frozen,
+ sk_tcp_socket_error
+ };
+
+ DWORD err;
+ char *errstr;
+ Actual_Socket ret;
+
+ /*
+ * Create Socket structure.
+ */
+ ret = snew(struct Socket_tag);
+ ret->fn = &fn_table;
+ ret->error = NULL;
+ ret->plug = plug;
+ bufchain_init(&ret->output_data);
+ ret->writable = 1; /* to start with */
+ ret->sending_oob = 0;
+ ret->outgoingeof = EOF_NO;
+ ret->frozen = 1;
+ ret->frozen_readable = 0;
+ ret->localhost_only = 0; /* unused, but best init anyway */
+ ret->pending_error = 0;
+ ret->parent = ret->child = NULL;
+ ret->addr = NULL;
+
+ ret->s = (SOCKET)ctx.p;
+
+ if (ret->s == INVALID_SOCKET) {
+ err = p_WSAGetLastError();
+ ret->error = winsock_error_string(err);
+ return (Socket) ret;
+ }
+
+ ret->oobinline = 0;
+
+ /* Set up a select mechanism. This could be an AsyncSelect on a
+ * window, or an EventSelect on an event object. */
+ errstr = do_select(ret->s, 1);
+ if (errstr) {
+ ret->error = errstr;
+ return (Socket) ret;
+ }
+
+ add234(sktree, ret);
+
+ return (Socket) ret;
+}
+
+static DWORD try_connect(Actual_Socket sock)
+{
+ SOCKET s;
+#ifndef NO_IPV6
+ SOCKADDR_IN6 a6;
+#endif
+ SOCKADDR_IN a;
+ DWORD err;
+ char *errstr;
+ short localport;
+ int family;
+
+ if (sock->s != INVALID_SOCKET) {
+ do_select(sock->s, 0);
+ p_closesocket(sock->s);
+ }
+
+ plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
+
+ /*
+ * Open socket.
+ */
+ family = SOCKADDR_FAMILY(sock->addr, sock->step);
+
+ /*
+ * Remove the socket from the tree before we overwrite its
+ * internal socket id, because that forms part of the tree's
+ * sorting criterion. We'll add it back before exiting this
+ * function, whether we changed anything or not.
+ */
+ del234(sktree, sock);
+
+ s = p_socket(family, SOCK_STREAM, 0);
+ sock->s = s;
+
+ if (s == INVALID_SOCKET) {
+ err = p_WSAGetLastError();
+ sock->error = winsock_error_string(err);
+ goto ret;
+ }
+
+ if (sock->oobinline) {
+ BOOL b = TRUE;
+ p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
+ }
+
+ if (sock->nodelay) {
+ BOOL b = TRUE;
+ p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
+ }
+
+ if (sock->keepalive) {
+ BOOL b = TRUE;
+ p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
+ }
+
+ /*
+ * Bind to local address.
+ */
+ if (sock->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 sockcode;
+
+#ifndef NO_IPV6
+ if (family == AF_INET6) {
+ memset(&a6, 0, sizeof(a6));
+ a6.sin6_family = AF_INET6;
+ /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
+ a6.sin6_port = p_htons(localport);
+ } else
+#endif
+ {
+ a.sin_family = AF_INET;
+ a.sin_addr.s_addr = p_htonl(INADDR_ANY);
+ a.sin_port = p_htons(localport);
+ }
+#ifndef NO_IPV6
+ sockcode = p_bind(s, (family == AF_INET6 ?
+ (struct sockaddr *) &a6 :
+ (struct sockaddr *) &a),
+ (family == AF_INET6 ? sizeof(a6) : sizeof(a)));
+#else
+ sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
+#endif
+ if (sockcode != SOCKET_ERROR) {
+ err = 0;
+ break; /* done */
+ } else {
+ err = p_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) {
+ sock->error = winsock_error_string(err);
+ goto ret;
+ }
+
+ /*
+ * Connect to remote address.
+ */
+#ifndef NO_IPV6
+ if (sock->step.ai) {
+ if (family == AF_INET6) {
+ a6.sin6_family = AF_INET6;
+ a6.sin6_port = p_htons((short) sock->port);
+ a6.sin6_addr =
+ ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr;
+ a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo;
+ a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id;
+ } else {
+ a.sin_family = AF_INET;
+ a.sin_addr =
+ ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr;
+ a.sin_port = p_htons((short) sock->port);
+ }
+ } else
+#endif
+ {
+ assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses);
+ a.sin_family = AF_INET;
+ a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]);
+ a.sin_port = p_htons((short) sock->port);
+ }
+
+ /* Set up a select mechanism. This could be an AsyncSelect on a
+ * window, or an EventSelect on an event object. */
+ errstr = do_select(s, 1);
+ if (errstr) {
+ sock->error = errstr;
+ err = 1;
+ goto ret;
+ }
+
+ if ((
+#ifndef NO_IPV6
+ p_connect(s,
+ ((family == AF_INET6) ? (struct sockaddr *) &a6 :
+ (struct sockaddr *) &a),
+ (family == AF_INET6) ? sizeof(a6) : sizeof(a))
+#else
+ p_connect(s, (struct sockaddr *) &a, sizeof(a))
+#endif
+ ) == SOCKET_ERROR) {
+ err = p_WSAGetLastError();
+ /*
+ * We expect a potential EWOULDBLOCK here, because the
+ * chances are the front end has done a select for
+ * FD_CONNECT, so that connect() will complete
+ * asynchronously.
+ */
+ if ( err != WSAEWOULDBLOCK ) {
+ sock->error = winsock_error_string(err);
+ goto ret;
+ }
+ } else {
+ /*
+ * If we _don't_ get EWOULDBLOCK, the connect has completed
+ * and we should set the socket as writable.
+ */
+ sock->writable = 1;
+ }
+
+ err = 0;
+
+ ret:
+
+ /*
+ * No matter what happened, put the socket back in the tree.
+ */
+ add234(sktree, sock);
+
+ if (err)
+ plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
+ return err;
+}
+
+Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
+ int nodelay, int keepalive, Plug plug)
+{
+ static const struct socket_function_table fn_table = {
+ sk_tcp_plug,
+ sk_tcp_close,
+ sk_tcp_write,
+ sk_tcp_write_oob,
+ sk_tcp_write_eof,
+ sk_tcp_flush,
+ sk_tcp_set_frozen,
+ sk_tcp_socket_error
+ };
+
+ Actual_Socket ret;
+ DWORD err;
+
+ /*
+ * Create Socket structure.
+ */
+ ret = snew(struct Socket_tag);
+ ret->fn = &fn_table;
+ ret->error = NULL;
+ ret->plug = plug;
+ bufchain_init(&ret->output_data);
+ ret->connected = 0; /* to start with */
+ ret->writable = 0; /* to start with */
+ ret->sending_oob = 0;
+ ret->outgoingeof = EOF_NO;
+ ret->frozen = 0;
+ ret->frozen_readable = 0;
+ ret->localhost_only = 0; /* unused, but best init anyway */
+ ret->pending_error = 0;
+ ret->parent = ret->child = NULL;
+ ret->oobinline = oobinline;
+ ret->nodelay = nodelay;
+ ret->keepalive = keepalive;
+ ret->privport = privport;
+ ret->port = port;
+ ret->addr = addr;
+ START_STEP(ret->addr, ret->step);
+ ret->s = INVALID_SOCKET;
+
+ err = 0;
+ do {
+ err = try_connect(ret);
+ } while (err && sk_nextaddr(ret->addr, &ret->step));
+
+ return (Socket) ret;
+}
+
+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,
+ sk_tcp_close,
+ sk_tcp_write,
+ sk_tcp_write_oob,
+ sk_tcp_write_eof,
+ sk_tcp_flush,
+ sk_tcp_set_frozen,
+ sk_tcp_socket_error
+ };
+
+ SOCKET s;
+#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.
+ */
+ ret = snew(struct Socket_tag);
+ ret->fn = &fn_table;
+ ret->error = NULL;
+ ret->plug = plug;
+ bufchain_init(&ret->output_data);
+ ret->writable = 0; /* to start with */
+ ret->sending_oob = 0;
+ ret->outgoingeof = EOF_NO;
+ ret->frozen = 0;
+ ret->frozen_readable = 0;
+ ret->localhost_only = local_host_only;
+ ret->pending_error = 0;
+ ret->parent = ret->child = NULL;
+ ret->addr = 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(address_family, SOCK_STREAM, 0);
+ ret->s = s;
+
+ if (s == INVALID_SOCKET) {
+ err = p_WSAGetLastError();
+ ret->error = winsock_error_string(err);
+ return (Socket) ret;
+ }
+
+ ret->oobinline = 0;
+
+ p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
+
+#ifndef NO_IPV6
+ if (address_family == AF_INET6) {
+ memset(&a6, 0, sizeof(a6));
+ a6.sin6_family = AF_INET6;
+ if (local_host_only)
+ a6.sin6_addr = in6addr_loopback;
+ else
+ a6.sin6_addr = in6addr_any;
+ if (srcaddr != NULL && p_getaddrinfo) {
+ struct addrinfo hints;
+ struct addrinfo *ai;
+ int err;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_INET6;
+ hints.ai_flags = 0;
+ {
+ /* strip [] on IPv6 address literals */
+ char *trimmed_addr = host_strduptrim(srcaddr);
+ err = p_getaddrinfo(trimmed_addr, NULL, &hints, &ai);
+ sfree(trimmed_addr);
+ }
+ if (err == 0 && ai->ai_family == AF_INET6) {
+ a6.sin6_addr =
+ ((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
+ }
+ }
+ a6.sin6_port = p_htons(port);
+ } else
+#endif
+ {
+ int got_addr = 0;
+ a.sin_family = AF_INET;
+
+ /*
+ * Bind to source address. First try an explicitly
+ * specified one...
+ */
+ if (srcaddr) {
+ a.sin_addr.s_addr = p_inet_addr(srcaddr);
+ if (a.sin_addr.s_addr != INADDR_NONE) {
+ /* Override localhost_only with specified listen addr. */
+ ret->localhost_only = ipv4_is_loopback(a.sin_addr);
+ got_addr = 1;
+ }
+ }
+
+ /*
+ * ... and failing that, go with one of the standard ones.
+ */
+ if (!got_addr) {
+ if (local_host_only)
+ a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
+ else
+ a.sin_addr.s_addr = p_htonl(INADDR_ANY);
+ }
+
+ a.sin_port = p_htons((short)port);
+ }
+#ifndef NO_IPV6
+ retcode = p_bind(s, (address_family == AF_INET6 ?
+ (struct sockaddr *) &a6 :
+ (struct sockaddr *) &a),
+ (address_family ==
+ AF_INET6 ? sizeof(a6) : sizeof(a)));
+#else
+ retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
+#endif
+ if (retcode != SOCKET_ERROR) {
+ err = 0;
+ } else {
+ err = p_WSAGetLastError();
+ }
+
+ if (err) {
+ p_closesocket(s);
+ ret->error = winsock_error_string(err);
+ return (Socket) ret;
+ }
+
+
+ if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
+ p_closesocket(s);
+ ret->error = winsock_error_string(p_WSAGetLastError());
+ return (Socket) ret;
+ }
+
+ /* Set up a select mechanism. This could be an AsyncSelect on a
+ * 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;
+}
+
+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);
+ if (s->addr)
+ sk_addr_free(s->addr);
+ sfree(s);
+}
+
+/*
+ * Deal with socket errors detected in try_send().
+ */
+static void socket_error_callback(void *vs)
+{
+ Actual_Socket s = (Actual_Socket)vs;
+
+ /*
+ * Just in case other socket work has caused this socket to vanish
+ * or become somehow non-erroneous before this callback arrived...
+ */
+ if (!find234(sktree, s, NULL) || !s->pending_error)
+ return;
+
+ /*
+ * An error has occurred on this socket. Pass it to the plug.
+ */
+ plug_closing(s->plug, winsock_error_string(s->pending_error),
+ s->pending_error, 0);
+}
+
+/*
+ * The function which tries to send on a socket once it's deemed
+ * writable.
+ */
+void try_send(Actual_Socket s)
+{
+ while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
+ int nsent;
+ DWORD err;
+ void *data;
+ int len, urgentflag;
+
+ if (s->sending_oob) {
+ urgentflag = MSG_OOB;
+ len = s->sending_oob;
+ data = &s->oobdata;
+ } else {
+ urgentflag = 0;
+ bufchain_prefix(&s->output_data, &data, &len);
+ }
+ nsent = p_send(s->s, data, len, urgentflag);
+ noise_ultralight(nsent);
+ if (nsent <= 0) {
+ err = (nsent < 0 ? p_WSAGetLastError() : 0);
+ if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
+ /*
+ * Perfectly normal: we've sent all we can for the moment.
+ *
+ * (Some WinSock send() implementations can return
+ * <0 but leave no sensible error indication -
+ * WSAGetLastError() is called but returns zero or
+ * a small number - so we check that case and treat
+ * it just like WSAEWOULDBLOCK.)
+ */
+ s->writable = FALSE;
+ return;
+ } else if (nsent == 0 ||
+ err == WSAECONNABORTED || err == WSAECONNRESET) {
+ /*
+ * If send() returns CONNABORTED or CONNRESET, we
+ * unfortunately can't just call plug_closing(),
+ * because it's quite likely that we're currently
+ * _in_ a call from the code we'd be calling back
+ * to, so we'd have to make half the SSH code
+ * reentrant. Instead we flag a pending error on
+ * the socket, to be dealt with (by calling
+ * plug_closing()) at some suitable future moment.
+ */
+ s->pending_error = err;
+ queue_toplevel_callback(socket_error_callback, s);
+ return;
+ } else {
+ /* We're inside the Windows frontend here, so we know
+ * that the frontend handle is unnecessary. */
+ logevent(NULL, winsock_error_string(err));
+ fatalbox("%s", winsock_error_string(err));
+ }
+ } else {
+ if (s->sending_oob) {
+ if (nsent < len) {
+ memmove(s->oobdata, s->oobdata+nsent, len-nsent);
+ s->sending_oob = len - nsent;
+ } else {
+ s->sending_oob = 0;
+ }
+ } else {
+ bufchain_consume(&s->output_data, nsent);
+ }
+ }
+ }
+
+ /*
+ * If we reach here, we've finished sending everything we might
+ * have needed to send. Send EOF, if we need to.
+ */
+ if (s->outgoingeof == EOF_PENDING) {
+ p_shutdown(s->s, SD_SEND);
+ s->outgoingeof = EOF_SENT;
+ }
+}
+
+static int sk_tcp_write(Socket sock, const char *buf, int len)
+{
+ Actual_Socket s = (Actual_Socket) sock;
+
+ assert(s->outgoingeof == EOF_NO);
+
+ /*
+ * Add the data to the buffer list on the socket.
+ */
+ bufchain_add(&s->output_data, buf, len);
+
+ /*
+ * Now try sending from the start of the buffer list.
+ */
+ if (s->writable)
+ try_send(s);
+
+ return bufchain_size(&s->output_data);
+}
+
+static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
+{
+ Actual_Socket s = (Actual_Socket) sock;
+
+ assert(s->outgoingeof == EOF_NO);
+
+ /*
+ * Replace the buffer list on the socket with the data.
+ */
+ bufchain_clear(&s->output_data);
+ assert(len <= sizeof(s->oobdata));
+ memcpy(s->oobdata, buf, len);
+ s->sending_oob = len;
+
+ /*
+ * Now try sending from the start of the buffer list.
+ */
+ if (s->writable)
+ try_send(s);
+
+ return s->sending_oob;
+}
+
+static void sk_tcp_write_eof(Socket sock)
+{
+ Actual_Socket s = (Actual_Socket) sock;
+
+ assert(s->outgoingeof == EOF_NO);
+
+ /*
+ * Mark the socket as pending outgoing EOF.
+ */
+ s->outgoingeof = EOF_PENDING;
+
+ /*
+ * Now try sending from the start of the buffer list.
+ */
+ if (s->writable)
+ try_send(s);
+}
+
+int select_result(WPARAM wParam, LPARAM lParam)
+{
+ int ret, open;
+ DWORD err;
+ char buf[20480]; /* nice big buffer for plenty of speed */
+ Actual_Socket s;
+ u_long atmark;
+
+ /* wParam is the socket itself */
+
+ if (wParam == 0)
+ return 1; /* boggle */
+
+ s = find234(sktree, (void *) wParam, cmpforsearch);
+ if (!s)
+ return 1; /* boggle */
+
+ if ((err = WSAGETSELECTERROR(lParam)) != 0) {
+ /*
+ * An error has occurred on this socket. Pass it to the
+ * plug.
+ */
+ if (s->addr) {
+ plug_log(s->plug, 1, s->addr, s->port,
+ winsock_error_string(err), err);
+ while (s->addr && sk_nextaddr(s->addr, &s->step)) {
+ err = try_connect(s);
+ }
+ }
+ if (err != 0)
+ return plug_closing(s->plug, winsock_error_string(err), err, 0);
+ else
+ return 1;
+ }
+
+ noise_ultralight(lParam);
+
+ switch (WSAGETSELECTEVENT(lParam)) {
+ case FD_CONNECT:
+ s->connected = s->writable = 1;
+ /*
+ * Once a socket is connected, we can stop falling
+ * back through the candidate addresses to connect
+ * to.
+ */
+ if (s->addr) {
+ sk_addr_free(s->addr);
+ s->addr = NULL;
+ }
+ break;
+ case FD_READ:
+ /* In the case the socket is still frozen, we don't even bother */
+ if (s->frozen) {
+ s->frozen_readable = 1;
+ break;
+ }
+
+ /*
+ * We have received data on the socket. For an oobinline
+ * socket, this might be data _before_ an urgent pointer,
+ * in which case we send it to the back end with type==1
+ * (data prior to urgent).
+ */
+ if (s->oobinline) {
+ atmark = 1;
+ p_ioctlsocket(s->s, SIOCATMARK, &atmark);
+ /*
+ * Avoid checking the return value from ioctlsocket(),
+ * on the grounds that some WinSock wrappers don't
+ * support it. If it does nothing, we get atmark==1,
+ * which is equivalent to `no OOB pending', so the
+ * effect will be to non-OOB-ify any OOB data.
+ */
+ } else
+ atmark = 1;
+
+ ret = p_recv(s->s, buf, sizeof(buf), 0);
+ noise_ultralight(ret);
+ if (ret < 0) {
+ err = p_WSAGetLastError();
+ if (err == WSAEWOULDBLOCK) {
+ break;
+ }
+ }
+ if (ret < 0) {
+ return plug_closing(s->plug, winsock_error_string(err), err,
+ 0);
+ } else if (0 == ret) {
+ return plug_closing(s->plug, NULL, 0, 0);
+ } else {
+ return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
+ }
+ break;
+ case FD_OOB:
+ /*
+ * This will only happen on a non-oobinline socket. It
+ * indicates that we can immediately perform an OOB read
+ * and get back OOB data, which we will send to the back
+ * end with type==2 (urgent data).
+ */
+ ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
+ noise_ultralight(ret);
+ if (ret <= 0) {
+ char *str = (ret == 0 ? "Internal networking trouble" :
+ winsock_error_string(p_WSAGetLastError()));
+ /* We're inside the Windows frontend here, so we know
+ * that the frontend handle is unnecessary. */
+ logevent(NULL, str);
+ fatalbox("%s", str);
+ } else {
+ return plug_receive(s->plug, 2, buf, ret);
+ }
+ break;
+ case FD_WRITE:
+ {
+ int bufsize_before, bufsize_after;
+ s->writable = 1;
+ bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
+ try_send(s);
+ bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
+ if (bufsize_after < bufsize_before)
+ plug_sent(s->plug, bufsize_after);
+ }
+ break;
+ case FD_CLOSE:
+ /* Signal a close on the socket. First read any outstanding data. */
+ open = 1;
+ do {
+ ret = p_recv(s->s, buf, sizeof(buf), 0);
+ if (ret < 0) {
+ err = p_WSAGetLastError();
+ if (err == WSAEWOULDBLOCK)
+ break;
+ return plug_closing(s->plug, winsock_error_string(err),
+ err, 0);
+ } else {
+ if (ret)
+ open &= plug_receive(s->plug, 0, buf, ret);
+ else
+ open &= plug_closing(s->plug, NULL, 0, 0);
+ }
+ } while (ret > 0);
+ return open;
+ case FD_ACCEPT:
+ {
+#ifdef NO_IPV6
+ struct sockaddr_in isa;
+#else
+ struct sockaddr_storage isa;
+#endif
+ int addrlen = sizeof(isa);
+ SOCKET t; /* socket of connection */
+ accept_ctx_t actx;
+
+ memset(&isa, 0, sizeof(isa));
+ err = 0;
+ t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
+ if (t == INVALID_SOCKET)
+ {
+ err = p_WSAGetLastError();
+ if (err == WSATRY_AGAIN)
+ break;
+ }
+
+ actx.p = (void *)t;
+
+#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, sk_tcp_accept, actx)) {
+ p_closesocket(t); /* denied or error */
+ }
+ }
+ }
+
+ return 1;
+}
+
+/*
+ * Special error values are returned from sk_namelookup and sk_new
+ * if there's a problem. These functions extract an error message,
+ * or return NULL if there's no problem.
+ */
+const char *sk_addr_error(SockAddr addr)
+{
+ return addr->error;
+}
+static const char *sk_tcp_socket_error(Socket sock)
+{
+ Actual_Socket s = (Actual_Socket) sock;
+ return s->error;
+}
+
+static void sk_tcp_set_frozen(Socket sock, int is_frozen)
+{
+ Actual_Socket s = (Actual_Socket) sock;
+ if (s->frozen == is_frozen)
+ return;
+ s->frozen = is_frozen;
+ if (!is_frozen) {
+ do_select(s->s, 1);
+ if (s->frozen_readable) {
+ char c;
+ p_recv(s->s, &c, 1, MSG_PEEK);
+ }
+ }
+ s->frozen_readable = 0;
+}
+
+void socket_reselect_all(void)
+{
+ Actual_Socket s;
+ int i;
+
+ for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
+ if (!s->frozen)
+ do_select(s->s, 1);
+ }
+}
+
+/*
+ * For Plink: enumerate all sockets currently active.
+ */
+SOCKET first_socket(int *state)
+{
+ Actual_Socket s;
+ *state = 0;
+ s = index234(sktree, (*state)++);
+ return s ? s->s : INVALID_SOCKET;
+}
+
+SOCKET next_socket(int *state)
+{
+ Actual_Socket s = index234(sktree, (*state)++);
+ return s ? s->s : INVALID_SOCKET;
+}
+
+extern int socket_writable(SOCKET skt)
+{
+ Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
+
+ if (s)
+ return bufchain_size(&s->output_data) > 0;
+ else
+ return 0;
+}
+
+int net_service_lookup(char *service)
+{
+ struct servent *se;
+ se = p_getservbyname(service, NULL);
+ if (se != NULL)
+ return p_ntohs(se->s_port);
+ else
+ return 0;
+}
+
+char *get_hostname(void)
+{
+ int len = 128;
+ char *hostname = NULL;
+ do {
+ len *= 2;
+ hostname = sresize(hostname, len, char);
+ if (p_gethostname(hostname, len) < 0) {
+ sfree(hostname);
+ hostname = NULL;
+ break;
+ }
+ } while (strlen(hostname) >= (size_t)(len-1));
+ return hostname;
+}
+
+SockAddr platform_get_x11_unix_address(const char *display, int displaynum,
+ char **canonicalname)
+{
+ SockAddr ret = snew(struct SockAddr_tag);
+ memset(ret, 0, sizeof(struct SockAddr_tag));
+ ret->error = "unix sockets not supported on this platform";
+ ret->refcount = 1;
+ return ret;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-09 18:02:15 +0000