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putty-source/windows/network.c
Simon Tatham c1d9da67a2 Pass the calling Socket to plug_log. 
This enables plug_log to run query methods on the socket in order to
find out useful information to log. I don't expect it's sensible to do
anything else with it.
2024-06-29 12:00:12 +01:00

1887 lines
55 KiB
C
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/*
* Windows networking abstraction.
*
* For the IPv6 code in here I am indebted to Jeroen Massar and
* unfix.org.
*/
#include <winsock2.h> /* need to put this first, for winelib builds */
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#define NEED_DECLARATION_OF_SELECT /* in order to initialise it */
#include "putty.h"
#include "network.h"
#include "tree234.h"
#include "ssh.h"
#include <ws2tcpip.h>
#if HAVE_AFUNIX_H
#include <afunix.h>
#endif
#ifndef NO_IPV6
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wmissing-braces"
#endif
const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#endif
#define ipv4_is_loopback(addr) \
((p_ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L)
/*
* 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;
};
typedef struct NetSocket NetSocket;
struct NetSocket {
const char *error;
SOCKET s;
Plug *plug;
bufchain output_data;
bool connected;
bool writable;
bool frozen; /* this causes readability notifications to be ignored */
bool frozen_readable; /* this means we missed at least one readability
* notification while we were frozen */
bool localhost_only; /* for listening sockets */
char oobdata[1];
size_t sending_oob;
bool 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.
*/
NetSocket *parent, *child;
Socket sock;
};
/*
* Top-level discriminator for SockAddr.
*
* UNRESOLVED means a host name not yet put through DNS; IP means a
* resolved IP address (or list of them); UNIX indicates the AF_UNIX
* network family (which Windows also has); NAMEDPIPE indicates that
* this SockAddr is phony, holding a Windows named pipe pathname
* instead of any address WinSock can understand.
*/
typedef enum SuperFamily {
UNRESOLVED,
IP,
#if HAVE_AFUNIX_H
UNIX,
#endif
NAMEDPIPE
} SuperFamily;
struct SockAddr {
int refcount;
const char *error;
SuperFamily superfamily;
#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_UNIX for Unix-domain sockets; AF_UNSPEC
* indicates that name resolution has not been done and a simple host
* name is held in this SockAddr structure.
*/
static inline int sockaddr_family(SockAddr *addr, SockAddrStep step)
{
switch (addr->superfamily) {
case IP:
#ifndef NO_IPV6
if (step.ai)
return step.ai->ai_family;
#endif
return AF_INET;
#if HAVE_AFUNIX_H
case UNIX:
return AF_UNIX;
#endif
default:
return AF_UNSPEC;
}
}
/*
* 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)
{
NetSocket *a = (NetSocket *)av, *b = (NetSocket *)bv;
uintptr_t as = (uintptr_t) a->s, bs = (uintptr_t) 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)
{
NetSocket *b = (NetSocket *)bv;
uintptr_t as = (uintptr_t) av, bs = (uintptr_t) 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, ULONG, ntohl, (ULONG));
DECL_WINDOWS_FUNCTION(static, ULONG, htonl, (ULONG));
DECL_WINDOWS_FUNCTION(static, USHORT, htons, (USHORT));
DECL_WINDOWS_FUNCTION(static, USHORT, ntohs, (USHORT));
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, ULONG, inet_addr, (const char FAR *));
DECL_WINDOWS_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
DECL_WINDOWS_FUNCTION(static, const char FAR *, inet_ntop,
(int, void FAR *, char *, size_t));
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, ULONG FAR *));
DECL_WINDOWS_FUNCTION(static, SOCKET, accept,
(SOCKET, struct sockaddr FAR *, int FAR *));
DECL_WINDOWS_FUNCTION(static, int, getpeername,
(SOCKET, struct sockaddr FAR *, int FAR *));
DECL_WINDOWS_FUNCTION(static, int, getsockname,
(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, DWORD hostlen, char FAR *serv,
DWORD servlen, int flags));
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
static bool 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;
}
return true;
}
DEF_WINDOWS_FUNCTION(WSAAsyncSelect);
DEF_WINDOWS_FUNCTION(WSAEventSelect);
DEF_WINDOWS_FUNCTION(WSAGetLastError);
DEF_WINDOWS_FUNCTION(WSAEnumNetworkEvents);
DEF_WINDOWS_FUNCTION(select);
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)
modalfatalbox("Unable to load any WinSock library");
#ifndef NO_IPV6
/* Check if we have getaddrinfo in Winsock */
if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
GET_WINDOWS_FUNCTION(winsock_module, getaddrinfo);
GET_WINDOWS_FUNCTION(winsock_module, freeaddrinfo);
GET_WINDOWS_FUNCTION_NO_TYPECHECK(winsock_module, getnameinfo);
/* This function would fail its type-check if we did one,
* because the VS header file provides an inline definition
* which is __cdecl instead of WINAPI. */
} else {
/* Fall back to wship6.dll for Windows 2000 */
wship6_module = load_system32_dll("wship6.dll");
if (wship6_module) {
GET_WINDOWS_FUNCTION(wship6_module, getaddrinfo);
GET_WINDOWS_FUNCTION(wship6_module, freeaddrinfo);
/* See comment above about type check */
GET_WINDOWS_FUNCTION_NO_TYPECHECK(wship6_module, getnameinfo);
} else {
}
}
GET_WINDOWS_FUNCTION(winsock2_module, WSAAddressToStringA);
#endif
GET_WINDOWS_FUNCTION(winsock_module, WSAAsyncSelect);
GET_WINDOWS_FUNCTION(winsock_module, WSAEventSelect);
/* We don't type-check select because at least some MinGW versions
* of the Windows API headers seem to disagree with the
* documentation on whether the 'struct timeval *' pointer is
* const or not. */
GET_WINDOWS_FUNCTION_NO_TYPECHECK(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);
/* Winelib maps ntohl and friends to things like
* __wine_ulong_swap, which fail these type checks hopelessly */
GET_WINDOWS_FUNCTION_NO_TYPECHECK(winsock_module, ntohl);
GET_WINDOWS_FUNCTION_NO_TYPECHECK(winsock_module, htonl);
GET_WINDOWS_FUNCTION_NO_TYPECHECK(winsock_module, htons);
GET_WINDOWS_FUNCTION_NO_TYPECHECK(winsock_module, ntohs);
GET_WINDOWS_FUNCTION_NO_TYPECHECK(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);
/* Older Visual Studio, and MinGW as of Ubuntu 16.04, don't know
* about this function at all, so can't type-check it. Also there
* seems to be some disagreement in the VS headers about whether
* the second argument is void * or const void *, so I omit the
* type check. */
GET_WINDOWS_FUNCTION_NO_TYPECHECK(winsock_module, inet_ntop);
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, getpeername);
GET_WINDOWS_FUNCTION(winsock_module, getsockname);
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)) {
modalfatalbox("Unable to initialise WinSock");
}
sktree = newtree234(cmpfortree);
}
void sk_cleanup(void)
{
NetSocket *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
}
const char *winsock_error_string(int error)
{
/*
* 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";
}
/*
* Handle any other error code by delegating to win_strerror.
*/
return win_strerror(error);
}
static inline const char *namelookup_strerror(DWORD err)
{
/* PuTTY has traditionally translated a few of the likely error
* messages into more concise strings than the standard Windows ones */
return (err == WSAENETDOWN ? "Network is down" :
err == WSAHOST_NOT_FOUND ? "Host does not exist" :
err == WSATRY_AGAIN ? "Host not found" :
win_strerror(err));
}
SockAddr *sk_namelookup(const char *host, char **canonicalname,
int address_family)
{
*canonicalname = NULL;
SockAddr *addr = snew(SockAddr);
memset(addr, 0, sizeof(SockAddr));
addr->superfamily = UNRESOLVED;
addr->refcount = 1;
#ifndef NO_IPV6
/*
* Use getaddrinfo, as long as it's available. This should handle
* both IPv4 and IPv6 address literals, and hostnames, in one
* unified API.
*/
if (p_getaddrinfo) {
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
address_family == ADDRTYPE_IPV6 ? AF_INET6 :
AF_UNSPEC);
hints.ai_flags = AI_CANONNAME;
hints.ai_socktype = SOCK_STREAM;
/* strip [] on IPv6 address literals */
char *trimmed_host = host_strduptrim(host);
int err = p_getaddrinfo(trimmed_host, NULL, &hints, &addr->ais);
sfree(trimmed_host);
if (addr->ais) {
addr->superfamily = IP;
if (addr->ais->ai_canonname)
*canonicalname = dupstr(addr->ais->ai_canonname);
else
*canonicalname = dupstr(host);
} else {
addr->error = namelookup_strerror(err);
}
return addr;
}
#endif
/*
* Failing that (if IPv6 support was not compiled in, or if
* getaddrinfo turned out to be unavailable at run time), try the
* old-fashioned approach, which is to start by manually checking
* for an IPv4 literal and then use gethostbyname.
*/
unsigned long a = p_inet_addr(host);
if (a != (unsigned long) INADDR_NONE) {
addr->addresses = snew(unsigned long);
addr->naddresses = 1;
addr->addresses[0] = p_ntohl(a);
addr->superfamily = IP;
*canonicalname = dupstr(host);
return addr;
}
struct hostent *h = p_gethostbyname(host);
if (h) {
addr->superfamily = IP;
size_t n;
for (n = 0; h->h_addr_list[n]; n++);
addr->addresses = snewn(n, unsigned long);
addr->naddresses = n;
for (n = 0; n < addr->naddresses; n++) {
uint32_t a;
memcpy(&a, h->h_addr_list[n], sizeof(a));
addr->addresses[n] = p_ntohl(a);
}
*canonicalname = dupstr(h->h_name);
} else {
DWORD err = p_WSAGetLastError();
addr->error = namelookup_strerror(err);
}
return addr;
}
static SockAddr *sk_special_addr(SuperFamily superfamily, const char *name)
{
SockAddr *addr = snew(SockAddr);
addr->error = NULL;
addr->superfamily = superfamily;
#ifndef NO_IPV6
addr->ais = NULL;
#endif
addr->addresses = NULL;
addr->naddresses = 0;
addr->refcount = 1;
strncpy(addr->hostname, name, lenof(addr->hostname));
addr->hostname[lenof(addr->hostname)-1] = '\0';
return addr;
}
SockAddr *sk_nonamelookup(const char *host)
{
return sk_special_addr(UNRESOLVED, host);
}
SockAddr *sk_namedpipe_addr(const char *pipename)
{
return sk_special_addr(NAMEDPIPE, pipename);
}
#if HAVE_AFUNIX_H
SockAddr *sk_unix_addr(const char *sockpath)
{
return sk_special_addr(UNIX, sockpath);
}
#endif
static bool 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';
}
}
/*
* This constructs a SockAddr that points at one specific sub-address
* of a parent SockAddr. The returned SockAddr does not own all its
* own memory: it points into the old one's data structures, so it
* MUST NOT be used after the old one is freed, and it MUST NOT be
* passed to sk_addr_free. (The latter is why it's returned by value
* rather than dynamically allocated - that should clue in anyone
* writing a call to it that something is weird about it.)
*/
static SockAddr sk_extractaddr_tmp(
SockAddr *addr, const SockAddrStep *step)
{
SockAddr toret;
toret = *addr; /* structure copy */
toret.refcount = 1;
#ifndef NO_IPV6
toret.ais = step->ai;
#endif
if (sockaddr_family(addr, *step) == AF_INET
#ifndef NO_IPV6
&& !toret.ais
#endif
)
toret.addresses += step->curraddr;
return toret;
}
bool sk_addr_needs_port(SockAddr *addr)
{
return addr->superfamily != NAMEDPIPE
#if HAVE_AFUNIX_H
&& addr->superfamily != UNIX
#endif
;
}
bool 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 bool ipv4_is_local_addr(struct in_addr addr)
{
if (ipv4_is_loopback(addr))
return true; /* loopback addresses are local */
if (!n_local_interfaces) {
SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
DWORD retbytes;
SetHandleInformation((HANDLE)s, HANDLE_FLAG_INHERIT, 0);
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
n_local_interfaces = -1;
}
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 true; /* this address is local */
}
}
return false; /* this address is not local */
}
bool 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 false; /* we don't know; assume not */
}
}
bool sk_address_is_special_local(SockAddr *addr)
{
return false; /* 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
unreachable("bad address family in sk_addrcopy");
} 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_net_plug(Socket *sock, Plug *p)
{
NetSocket *s = container_of(sock, NetSocket, sock);
Plug *ret = s->plug;
if (p)
s->plug = p;
return ret;
}
static void sk_net_close(Socket *s);
static size_t sk_net_write(Socket *s, const void *data, size_t len);
static size_t sk_net_write_oob(Socket *s, const void *data, size_t len);
static void sk_net_write_eof(Socket *s);
static void sk_net_set_frozen(Socket *s, bool is_frozen);
static const char *sk_net_socket_error(Socket *s);
static SocketEndpointInfo *sk_net_endpoint_info(Socket *s, bool peer);
static const SocketVtable NetSocket_sockvt = {
.plug = sk_net_plug,
.close = sk_net_close,
.write = sk_net_write,
.write_oob = sk_net_write_oob,
.write_eof = sk_net_write_eof,
.set_frozen = sk_net_set_frozen,
.socket_error = sk_net_socket_error,
.endpoint_info = sk_net_endpoint_info,
};
static Socket *sk_net_accept(accept_ctx_t ctx, Plug *plug)
{
DWORD err;
const char *errstr;
NetSocket *s;
/*
* Create NetSocket structure.
*/
s = snew(NetSocket);
s->sock.vt = &NetSocket_sockvt;
s->error = NULL;
s->plug = plug;
bufchain_init(&s->output_data);
s->writable = true; /* to start with */
s->sending_oob = 0;
s->outgoingeof = EOF_NO;
s->frozen = true;
s->frozen_readable = false;
s->localhost_only = false; /* unused, but best init anyway */
s->pending_error = 0;
s->parent = s->child = NULL;
s->addr = NULL;
s->s = (SOCKET)ctx.p;
if (s->s == INVALID_SOCKET) {
err = p_WSAGetLastError();
s->error = winsock_error_string(err);
return &s->sock;
}
s->oobinline = false;
/* Set up a select mechanism. This could be an AsyncSelect on a
* window, or an EventSelect on an event object. */
errstr = do_select(s->s, true);
if (errstr) {
s->error = errstr;
return &s->sock;
}
add234(sktree, s);
return &s->sock;
}
static DWORD try_connect(NetSocket *sock)
{
SOCKET s;
#ifndef NO_IPV6
SOCKADDR_IN6 a6;
#endif
SOCKADDR_IN a;
DWORD err;
const char *errstr;
short localport;
int family;
if (sock->s != INVALID_SOCKET) {
do_select(sock->s, false);
p_closesocket(sock->s);
}
{
SockAddr thisaddr = sk_extractaddr_tmp(
sock->addr, &sock->step);
plug_log(sock->plug, &sock->sock, PLUGLOG_CONNECT_TRYING,
&thisaddr, 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;
}
SetHandleInformation((HANDLE)s, HANDLE_FLAG_INHERIT, 0);
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, true);
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 = true;
SockAddr thisaddr = sk_extractaddr_tmp(sock->addr, &sock->step);
plug_log(sock->plug, &sock->sock, PLUGLOG_CONNECT_SUCCESS,
&thisaddr, sock->port, NULL, 0);
}
err = 0;
ret:
/*
* No matter what happened, put the socket back in the tree.
*/
add234(sktree, sock);
if (err) {
SockAddr thisaddr = sk_extractaddr_tmp(
sock->addr, &sock->step);
plug_log(sock->plug, &sock->sock, PLUGLOG_CONNECT_FAILED,
&thisaddr, sock->port, sock->error, err);
}
return err;
}
Socket *sk_new(SockAddr *addr, int port, bool privport, bool oobinline,
bool nodelay, bool keepalive, Plug *plug)
{
NetSocket *s;
DWORD err;
/*
* Create NetSocket structure.
*/
s = snew(NetSocket);
s->sock.vt = &NetSocket_sockvt;
s->error = NULL;
s->plug = plug;
bufchain_init(&s->output_data);
s->connected = false; /* to start with */
s->writable = false; /* to start with */
s->sending_oob = 0;
s->outgoingeof = EOF_NO;
s->frozen = false;
s->frozen_readable = false;
s->localhost_only = false; /* unused, but best init anyway */
s->pending_error = 0;
s->parent = s->child = NULL;
s->oobinline = oobinline;
s->nodelay = nodelay;
s->keepalive = keepalive;
s->privport = privport;
s->port = port;
s->addr = addr;
START_STEP(s->addr, s->step);
s->s = INVALID_SOCKET;
err = 0;
do {
err = try_connect(s);
} while (err && sk_nextaddr(s->addr, &s->step));
return &s->sock;
}
static Socket *sk_newlistener_internal(
const char *srcaddr, int port, Plug *plug,
bool local_host_only, int orig_address_family)
{
SOCKET sk;
SOCKADDR_IN a;
#ifndef NO_IPV6
SOCKADDR_IN6 a6;
#endif
#if HAVE_AFUNIX_H
SOCKADDR_UN au;
#endif
struct sockaddr *bindaddr;
unsigned bindsize;
DWORD err;
const char *errstr;
NetSocket *s;
int retcode;
int address_family = orig_address_family;
/*
* Create NetSocket structure.
*/
s = snew(NetSocket);
s->sock.vt = &NetSocket_sockvt;
s->error = NULL;
s->plug = plug;
bufchain_init(&s->output_data);
s->writable = false; /* to start with */
s->sending_oob = 0;
s->outgoingeof = EOF_NO;
s->frozen = false;
s->frozen_readable = false;
s->localhost_only = local_host_only;
s->pending_error = 0;
s->parent = s->child = NULL;
s->addr = NULL;
/*
* 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.
*/
sk = p_socket(address_family, SOCK_STREAM, 0);
s->s = sk;
if (sk == INVALID_SOCKET) {
err = p_WSAGetLastError();
s->error = winsock_error_string(err);
return &s->sock;
}
SetHandleInformation((HANDLE)sk, HANDLE_FLAG_INHERIT, 0);
s->oobinline = false;
#if HAVE_AFUNIX_H
if (address_family != AF_UNIX)
#endif
{
BOOL on = true;
p_setsockopt(sk, SOL_SOCKET, SO_EXCLUSIVEADDRUSE,
(const char *)&on, sizeof(on));
}
switch (address_family) {
#ifndef NO_IPV6
case 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);
bindaddr = (struct sockaddr *)&a6;
bindsize = sizeof(a6);
break;
}
#endif
case AF_INET: {
bool got_addr = false;
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. */
s->localhost_only = ipv4_is_loopback(a.sin_addr);
got_addr = true;
}
}
/*
* ... 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);
bindaddr = (struct sockaddr *)&a;
bindsize = sizeof(a);
break;
}
#if HAVE_AFUNIX_H
case AF_UNIX: {
au.sun_family = AF_UNIX;
strncpy(au.sun_path, srcaddr, sizeof(au.sun_path));
bindaddr = (struct sockaddr *)&au;
bindsize = sizeof(au);
break;
}
#endif
default:
unreachable("bad address family in sk_newlistener_internal");
}
retcode = p_bind(sk, bindaddr, bindsize);
if (retcode != SOCKET_ERROR) {
err = 0;
} else {
err = p_WSAGetLastError();
}
if (err) {
p_closesocket(sk);
s->error = winsock_error_string(err);
return &s->sock;
}
if (p_listen(sk, SOMAXCONN) == SOCKET_ERROR) {
p_closesocket(sk);
s->error = winsock_error_string(p_WSAGetLastError());
return &s->sock;
}
/* Set up a select mechanism. This could be an AsyncSelect on a
* window, or an EventSelect on an event object. */
errstr = do_select(sk, true);
if (errstr) {
p_closesocket(sk);
s->error = errstr;
return &s->sock;
}
add234(sktree, s);
#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 == AF_UNSPEC) {
Socket *other = sk_newlistener_internal(srcaddr, port, plug,
local_host_only, AF_INET6);
if (other) {
NetSocket *ns = container_of(other, NetSocket, sock);
if (!ns->error) {
ns->parent = s;
s->child = ns;
} else {
sfree(ns);
}
}
}
#endif
return &s->sock;
}
Socket *sk_newlistener(const char *srcaddr, int port, Plug *plug,
bool local_host_only, int orig_address_family)
{
/*
* Translate address_family from platform-independent constants
* into local reality.
*/
int address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
#ifndef NO_IPV6
orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
#endif
AF_UNSPEC);
return sk_newlistener_internal(srcaddr, port, plug, local_host_only,
address_family);
}
Socket *sk_newlistener_unix(const char *path, Plug *plug)
{
#if HAVE_AFUNIX_H
return sk_newlistener_internal(path, 0, plug, false, AF_UNIX);
#else
return new_error_socket_fmt(
plug, "AF_UNIX support not compiled into this program");
#endif
}
static void sk_net_close(Socket *sock)
{
NetSocket *s = container_of(sock, NetSocket, sock);
if (s->child)
sk_net_close(&s->child->sock);
bufchain_clear(&s->output_data);
del234(sktree, s);
do_select(s->s, false);
p_closesocket(s->s);
if (s->addr)
sk_addr_free(s->addr);
delete_callbacks_for_context(s);
sfree(s);
}
void plug_closing_system_error(Plug *plug, DWORD error)
{
PlugCloseType type = PLUGCLOSE_ERROR;
if (error == ERROR_BROKEN_PIPE)
type = PLUGCLOSE_BROKEN_PIPE;
plug_closing(plug, type, win_strerror(error));
}
void plug_closing_winsock_error(Plug *plug, DWORD error)
{
plug_closing(plug, PLUGCLOSE_ERROR, winsock_error_string(error));
}
/*
* Deal with socket errors detected in try_send().
*/
static void socket_error_callback(void *vs)
{
NetSocket *s = (NetSocket *)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_winsock_error(s->plug, s->pending_error);
}
/*
* The function which tries to send on a socket once it's deemed
* writable.
*/
static void try_send(NetSocket *s)
{
while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
int nsent;
DWORD err;
const void *data;
size_t len;
int urgentflag;
if (s->sending_oob) {
urgentflag = MSG_OOB;
len = s->sending_oob;
data = &s->oobdata;
} else {
urgentflag = 0;
ptrlen bufdata = bufchain_prefix(&s->output_data);
data = bufdata.ptr;
len = bufdata.len;
}
len = min(len, INT_MAX); /* WinSock send() takes an int */
nsent = p_send(s->s, data, len, urgentflag);
noise_ultralight(NOISE_SOURCE_IOLEN, 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 send() returns a socket error, 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 {
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 size_t sk_net_write(Socket *sock, const void *buf, size_t len)
{
NetSocket *s = container_of(sock, NetSocket, 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 size_t sk_net_write_oob(Socket *sock, const void *buf, size_t len)
{
NetSocket *s = container_of(sock, NetSocket, 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_net_write_eof(Socket *sock)
{
NetSocket *s = container_of(sock, NetSocket, 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);
}
void select_result(WPARAM wParam, LPARAM lParam)
{
int ret;
DWORD err;
char buf[20480]; /* nice big buffer for plenty of speed */
NetSocket *s;
bool atmark;
/* wParam is the socket itself */
if (wParam == 0)
return; /* boggle */
s = find234(sktree, (void *) wParam, cmpforsearch);
if (!s)
return; /* boggle */
if ((err = WSAGETSELECTERROR(lParam)) != 0) {
/*
* An error has occurred on this socket. Pass it to the
* plug.
*/
if (s->addr) {
SockAddr thisaddr = sk_extractaddr_tmp(
s->addr, &s->step);
plug_log(s->plug, &s->sock, PLUGLOG_CONNECT_FAILED, &thisaddr,
s->port, winsock_error_string(err), err);
while (err && s->addr && sk_nextaddr(s->addr, &s->step)) {
err = try_connect(s);
}
}
if (err != 0)
plug_closing_winsock_error(s->plug, err);
return;
}
noise_ultralight(NOISE_SOURCE_IOID, wParam);
switch (WSAGETSELECTEVENT(lParam)) {
case FD_CONNECT:
s->connected = true;
s->writable = true;
/*
* Once a socket is connected, we can stop falling back
* through the candidate addresses to connect to. But first,
* let the plug know we were successful.
*/
if (s->addr) {
SockAddr thisaddr = sk_extractaddr_tmp(
s->addr, &s->step);
plug_log(s->plug, &s->sock, PLUGLOG_CONNECT_SUCCESS,
&thisaddr, s->port, NULL, 0);
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 = true;
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) {
u_long atmark_from_ioctl = 1;
p_ioctlsocket(s->s, SIOCATMARK, &atmark_from_ioctl);
/*
* 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.
*/
atmark = atmark_from_ioctl;
} else
atmark = true;
ret = p_recv(s->s, buf, sizeof(buf), 0);
noise_ultralight(NOISE_SOURCE_IOLEN, ret);
if (ret < 0) {
err = p_WSAGetLastError();
if (err == WSAEWOULDBLOCK) {
break;
}
}
if (ret < 0) {
plug_closing_winsock_error(s->plug, err);
} else if (0 == ret) {
plug_closing_normal(s->plug);
} else {
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(NOISE_SOURCE_IOLEN, ret);
if (ret <= 0) {
int err = p_WSAGetLastError();
plug_closing_winsock_error(s->plug, err);
} else {
plug_receive(s->plug, 2, buf, ret);
}
break;
case FD_WRITE: {
int bufsize_before, bufsize_after;
s->writable = true;
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. */
do {
ret = p_recv(s->s, buf, sizeof(buf), 0);
if (ret < 0) {
err = p_WSAGetLastError();
if (err == WSAEWOULDBLOCK)
break;
plug_closing_winsock_error(s->plug, err);
} else {
if (ret)
plug_receive(s->plug, 0, buf, ret);
else
plug_closing_normal(s->plug);
}
} while (ret > 0);
return;
case FD_ACCEPT: {
#ifdef NO_IPV6
struct sockaddr_in isa;
#else
struct sockaddr_storage isa; // FIXME: also if Unix and no IPv6
#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_net_accept, actx)) {
p_closesocket(t); /* denied or error */
}
break;
}
}
}
/*
* 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_net_socket_error(Socket *sock)
{
NetSocket *s = container_of(sock, NetSocket, sock);
return s->error;
}
static SocketEndpointInfo *sk_net_endpoint_info(Socket *sock, bool peer)
{
NetSocket *s = container_of(sock, NetSocket, sock);
#ifdef NO_IPV6
struct sockaddr_in addr;
#else
struct sockaddr_storage addr; // FIXME: also if Unix and no IPv6
char buf[INET6_ADDRSTRLEN];
#endif
int addrlen = sizeof(addr);
SocketEndpointInfo *pi;
{
int retd = (peer ?
p_getpeername(s->s, (struct sockaddr *)&addr, &addrlen) :
p_getsockname(s->s, (struct sockaddr *)&addr, &addrlen));
if (retd < 0)
return NULL;
}
pi = snew(SocketEndpointInfo);
pi->addressfamily = ADDRTYPE_UNSPEC;
pi->addr_text = NULL;
pi->port = -1;
pi->log_text = NULL;
if (((struct sockaddr *)&addr)->sa_family == AF_INET) {
pi->addressfamily = ADDRTYPE_IPV4;
memcpy(pi->addr_bin.ipv4, &((struct sockaddr_in *)&addr)->sin_addr, 4);
pi->port = p_ntohs(((struct sockaddr_in *)&addr)->sin_port);
pi->addr_text = dupstr(
p_inet_ntoa(((struct sockaddr_in *)&addr)->sin_addr));
pi->log_text = dupprintf("%s:%d", pi->addr_text, pi->port);
#ifndef NO_IPV6
} else if (((struct sockaddr *)&addr)->sa_family == AF_INET6) {
pi->addressfamily = ADDRTYPE_IPV6;
memcpy(pi->addr_bin.ipv6,
&((struct sockaddr_in6 *)&addr)->sin6_addr, 16);
pi->port = p_ntohs(((struct sockaddr_in6 *)&addr)->sin6_port);
pi->addr_text = dupstr(
p_inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&addr)->sin6_addr,
buf, sizeof(buf)));
pi->log_text = dupprintf("[%s]:%d", pi->addr_text, pi->port);
#endif
} else {
sfree(pi);
return NULL;
}
return pi;
}
static void sk_net_set_frozen(Socket *sock, bool is_frozen)
{
NetSocket *s = container_of(sock, NetSocket, sock);
if (s->frozen == is_frozen)
return;
s->frozen = is_frozen;
if (!is_frozen) {
do_select(s->s, true);
if (s->frozen_readable) {
char c;
p_recv(s->s, &c, 1, MSG_PEEK);
}
}
s->frozen_readable = false;
}
void socket_reselect_all(void)
{
NetSocket *s;
int i;
for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
if (!s->frozen)
do_select(s->s, true);
}
}
/*
* For Plink: enumerate all sockets currently active.
*/
SOCKET first_socket(int *state)
{
NetSocket *s;
*state = 0;
s = index234(sktree, (*state)++);
return s ? s->s : INVALID_SOCKET;
}
SOCKET next_socket(int *state)
{
NetSocket *s = index234(sktree, (*state)++);
return s ? s->s : INVALID_SOCKET;
}
bool socket_writable(SOCKET skt)
{
NetSocket *s = find234(sktree, (void *)skt, cmpforsearch);
if (s)
return bufchain_size(&s->output_data) > 0;
else
return false;
}
int net_service_lookup(const 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)
{
char hostbuf[256]; /* MSDN docs for gethostname() promise this is enough */
if (p_gethostname(hostbuf, sizeof(hostbuf)) < 0)
return NULL;
return dupstr(hostbuf);
}
SockAddr *platform_get_x11_unix_address(const char *display, int displaynum)
{
SockAddr *addr = snew(SockAddr);
memset(addr, 0, sizeof(SockAddr));
addr->error = "unix sockets for X11 not supported on this platform";
addr->refcount = 1;
return addr;
}
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