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- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #ifdef WIN32
- //#include <io.h>
- #include <winsock2.h>
- #include <ws2tcpip.h>
- #define errorNumber WSAGetLastError()
- #else
- #define errorNumber errno
- #define closesocket close
- #include <sys/socket.h>
- #include <arpa/inet.h>
- #include <netinet/tcp.h>
- #include <netdb.h>
- #include <errno.h>
- #endif
-
- #include <stdlib.h>
- #include <unistd.h>
-
- #include <network/TcpSocket.h>
- #include <rfb/LogWriter.h>
- #include <rfb/Configuration.h>
-
- #ifdef WIN32
- #include <os/winerrno.h>
- #endif
-
- #ifndef INADDR_NONE
- #define INADDR_NONE ((unsigned long)-1)
- #endif
- #ifndef INADDR_LOOPBACK
- #define INADDR_LOOPBACK ((unsigned long)0x7F000001)
- #endif
-
- #ifndef IN6_ARE_ADDR_EQUAL
- #define IN6_ARE_ADDR_EQUAL(a,b) \
- (memcmp ((const void*)(a), (const void*)(b), sizeof (struct in6_addr)) == 0)
- #endif
-
- // Missing on older Windows and OS X
- #ifndef AI_NUMERICSERV
- #define AI_NUMERICSERV 0
- #endif
-
- using namespace network;
- using namespace rdr;
-
- static rfb::LogWriter vlog("TcpSocket");
-
- static rfb::BoolParameter UseIPv4("UseIPv4", "Use IPv4 for incoming and outgoing connections.", true);
- static rfb::BoolParameter UseIPv6("UseIPv6", "Use IPv6 for incoming and outgoing connections.", true);
-
- /* Tunnelling support. */
- int network::findFreeTcpPort (void)
- {
- int sock;
- struct sockaddr_in addr;
- memset(&addr, 0, sizeof(addr));
- addr.sin_family = AF_INET;
- addr.sin_addr.s_addr = INADDR_ANY;
-
- if ((sock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
- throw SocketException ("unable to create socket", errorNumber);
-
- addr.sin_port = 0;
- if (bind (sock, (struct sockaddr *)&addr, sizeof (addr)) < 0)
- throw SocketException ("unable to find free port", errorNumber);
-
- socklen_t n = sizeof(addr);
- if (getsockname (sock, (struct sockaddr *)&addr, &n) < 0)
- throw SocketException ("unable to get port number", errorNumber);
-
- closesocket (sock);
- return ntohs(addr.sin_port);
- }
-
- int network::getSockPort(int sock)
- {
- vnc_sockaddr_t sa;
- socklen_t sa_size = sizeof(sa);
- if (getsockname(sock, &sa.u.sa, &sa_size) < 0)
- return 0;
-
- switch (sa.u.sa.sa_family) {
- case AF_INET6:
- return ntohs(sa.u.sin6.sin6_port);
- default:
- return ntohs(sa.u.sin.sin_port);
- }
- }
-
- // -=- TcpSocket
-
- TcpSocket::TcpSocket(int sock) : Socket(sock)
- {
- // Disable Nagle's algorithm, to reduce latency
- enableNagles(false);
- }
-
- TcpSocket::TcpSocket(const char *host, int port)
- {
- int sock, err, result;
- struct addrinfo *ai, *current, hints;
-
- // - Create a socket
-
- memset(&hints, 0, sizeof(struct addrinfo));
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_canonname = NULL;
- hints.ai_addr = NULL;
- hints.ai_next = NULL;
-
- if ((result = getaddrinfo(host, NULL, &hints, &ai)) != 0) {
- throw Exception("unable to resolve host by name: %s",
- gai_strerror(result));
- }
-
- sock = -1;
- err = 0;
- for (current = ai; current != NULL; current = current->ai_next) {
- int family;
- vnc_sockaddr_t sa;
- socklen_t salen;
- char ntop[NI_MAXHOST];
-
- family = current->ai_family;
-
- switch (family) {
- case AF_INET:
- if (!UseIPv4)
- continue;
- break;
- case AF_INET6:
- if (!UseIPv6)
- continue;
- break;
- default:
- continue;
- }
-
- salen = current->ai_addrlen;
- memcpy(&sa, current->ai_addr, salen);
-
- if (family == AF_INET)
- sa.u.sin.sin_port = htons(port);
- else
- sa.u.sin6.sin6_port = htons(port);
-
- getnameinfo(&sa.u.sa, salen, ntop, sizeof(ntop), NULL, 0, NI_NUMERICHOST);
- vlog.debug("Connecting to %s [%s] port %d", host, ntop, port);
-
- sock = socket (family, SOCK_STREAM, 0);
- if (sock == -1) {
- err = errorNumber;
- freeaddrinfo(ai);
- throw SocketException("unable to create socket", err);
- }
-
- /* Attempt to connect to the remote host */
- while ((result = connect(sock, &sa.u.sa, salen)) == -1) {
- err = errorNumber;
- #ifndef WIN32
- if (err == EINTR)
- continue;
- #endif
- vlog.debug("Failed to connect to address %s port %d: %d",
- ntop, port, err);
- closesocket(sock);
- sock = -1;
- break;
- }
-
- if (result == 0)
- break;
- }
-
- freeaddrinfo(ai);
-
- if (sock == -1) {
- if (err == 0)
- throw Exception("No useful address for host");
- else
- throw SocketException("unable connect to socket", err);
- }
-
- // Take proper ownership of the socket
- setFd(sock);
-
- // Disable Nagle's algorithm, to reduce latency
- enableNagles(false);
- }
-
- char* TcpSocket::getPeerAddress() {
- vnc_sockaddr_t sa;
- socklen_t sa_size = sizeof(sa);
-
- if (getpeername(getFd(), &sa.u.sa, &sa_size) != 0) {
- vlog.error("unable to get peer name for socket");
- return rfb::strDup("");
- }
-
- if (sa.u.sa.sa_family == AF_INET6) {
- char buffer[INET6_ADDRSTRLEN + 2];
- int ret;
-
- buffer[0] = '[';
-
- ret = getnameinfo(&sa.u.sa, sizeof(sa.u.sin6),
- buffer + 1, sizeof(buffer) - 2, NULL, 0,
- NI_NUMERICHOST);
- if (ret != 0) {
- vlog.error("unable to convert peer name to a string");
- return rfb::strDup("");
- }
-
- strcat(buffer, "]");
-
- return rfb::strDup(buffer);
- }
-
- if (sa.u.sa.sa_family == AF_INET) {
- char *name;
-
- name = inet_ntoa(sa.u.sin.sin_addr);
- if (name == NULL) {
- vlog.error("unable to convert peer name to a string");
- return rfb::strDup("");
- }
-
- return rfb::strDup(name);
- }
-
- vlog.error("unknown address family for socket");
- return rfb::strDup("");
- }
-
- char* TcpSocket::getPeerEndpoint() {
- rfb::CharArray address; address.buf = getPeerAddress();
- vnc_sockaddr_t sa;
- socklen_t sa_size = sizeof(sa);
- int port;
-
- getpeername(getFd(), &sa.u.sa, &sa_size);
-
- if (sa.u.sa.sa_family == AF_INET6)
- port = ntohs(sa.u.sin6.sin6_port);
- else if (sa.u.sa.sa_family == AF_INET)
- port = ntohs(sa.u.sin.sin_port);
- else
- port = 0;
-
- int buflen = strlen(address.buf) + 32;
- char* buffer = new char[buflen];
- sprintf(buffer, "%s::%d", address.buf, port);
- return buffer;
- }
-
- bool TcpSocket::enableNagles(bool enable) {
- int one = enable ? 0 : 1;
- if (setsockopt(getFd(), IPPROTO_TCP, TCP_NODELAY,
- (char *)&one, sizeof(one)) < 0) {
- int e = errorNumber;
- vlog.error("unable to setsockopt TCP_NODELAY: %d", e);
- return false;
- }
- return true;
- }
-
- bool TcpSocket::cork(bool enable) {
- #ifndef TCP_CORK
- return false;
- #else
- int one = enable ? 1 : 0;
- if (setsockopt(getFd(), IPPROTO_TCP, TCP_CORK, (char *)&one, sizeof(one)) < 0)
- return false;
- return true;
- #endif
- }
-
- TcpListener::TcpListener(int sock) : SocketListener(sock)
- {
- }
-
- TcpListener::TcpListener(const struct sockaddr *listenaddr,
- socklen_t listenaddrlen)
- {
- int one = 1;
- vnc_sockaddr_t sa;
- int sock;
-
- if ((sock = socket (listenaddr->sa_family, SOCK_STREAM, 0)) < 0)
- throw SocketException("unable to create listening socket", errorNumber);
-
- memcpy (&sa, listenaddr, listenaddrlen);
- #ifdef IPV6_V6ONLY
- if (listenaddr->sa_family == AF_INET6) {
- if (setsockopt (sock, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&one, sizeof(one))) {
- int e = errorNumber;
- closesocket(sock);
- throw SocketException("unable to set IPV6_V6ONLY", e);
- }
- }
- #endif /* defined(IPV6_V6ONLY) */
-
- #ifdef FD_CLOEXEC
- // - By default, close the socket on exec()
- fcntl(sock, F_SETFD, FD_CLOEXEC);
- #endif
-
- // SO_REUSEADDR is broken on Windows. It allows binding to a port
- // that already has a listening socket on it. SO_EXCLUSIVEADDRUSE
- // might do what we want, but requires investigation.
- #ifndef WIN32
- if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
- (char *)&one, sizeof(one)) < 0) {
- int e = errorNumber;
- closesocket(sock);
- throw SocketException("unable to create listening socket", e);
- }
- #endif
-
- if (bind(sock, &sa.u.sa, listenaddrlen) == -1) {
- int e = errorNumber;
- closesocket(sock);
- throw SocketException("failed to bind socket", e);
- }
-
- listen(sock);
- }
-
- Socket* TcpListener::createSocket(int fd) {
- return new TcpSocket(fd);
- }
-
- void TcpListener::getMyAddresses(std::list<char*>* result) {
- struct addrinfo *ai, *current, hints;
-
- initSockets();
-
- memset(&hints, 0, sizeof(struct addrinfo));
- hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_canonname = NULL;
- hints.ai_addr = NULL;
- hints.ai_next = NULL;
-
- // Windows doesn't like NULL for service, so specify something
- if ((getaddrinfo(NULL, "1", &hints, &ai)) != 0)
- return;
-
- for (current= ai; current != NULL; current = current->ai_next) {
- switch (current->ai_family) {
- case AF_INET:
- if (!UseIPv4)
- continue;
- break;
- case AF_INET6:
- if (!UseIPv6)
- continue;
- break;
- default:
- continue;
- }
-
- char *addr = new char[INET6_ADDRSTRLEN];
-
- getnameinfo(current->ai_addr, current->ai_addrlen, addr, INET6_ADDRSTRLEN,
- NULL, 0, NI_NUMERICHOST);
-
- result->push_back(addr);
- }
-
- freeaddrinfo(ai);
- }
-
- int TcpListener::getMyPort() {
- return getSockPort(getFd());
- }
-
-
- void network::createLocalTcpListeners(std::list<SocketListener*> *listeners,
- int port)
- {
- struct addrinfo ai[2];
- vnc_sockaddr_t sa[2];
-
- memset(ai, 0, sizeof(ai));
- memset(sa, 0, sizeof(sa));
-
- sa[0].u.sin.sin_family = AF_INET;
- sa[0].u.sin.sin_port = htons (port);
- sa[0].u.sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
-
- ai[0].ai_family = sa[0].u.sin.sin_family;
- ai[0].ai_addr = &sa[0].u.sa;
- ai[0].ai_addrlen = sizeof(sa[0].u.sin);
- ai[0].ai_next = &ai[1];
-
- sa[1].u.sin6.sin6_family = AF_INET6;
- sa[1].u.sin6.sin6_port = htons (port);
- sa[1].u.sin6.sin6_addr = in6addr_loopback;
-
- ai[1].ai_family = sa[1].u.sin6.sin6_family;
- ai[1].ai_addr = &sa[1].u.sa;
- ai[1].ai_addrlen = sizeof(sa[1].u.sin6);
- ai[1].ai_next = NULL;
-
- createTcpListeners(listeners, ai);
- }
-
- void network::createTcpListeners(std::list<SocketListener*> *listeners,
- const char *addr,
- int port)
- {
- struct addrinfo *ai, hints;
- char service[16];
- int result;
-
- initSockets();
-
- memset(&hints, 0, sizeof(struct addrinfo));
- hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
- hints.ai_family = AF_UNSPEC;
- hints.ai_socktype = SOCK_STREAM;
- hints.ai_canonname = NULL;
- hints.ai_addr = NULL;
- hints.ai_next = NULL;
-
- snprintf (service, sizeof (service) - 1, "%d", port);
- service[sizeof (service) - 1] = '\0';
- if ((result = getaddrinfo(addr, service, &hints, &ai)) != 0)
- throw rdr::Exception("unable to resolve listening address: %s",
- gai_strerror(result));
-
- try {
- createTcpListeners(listeners, ai);
- } catch(...) {
- freeaddrinfo(ai);
- throw;
- }
- }
-
- void network::createTcpListeners(std::list<SocketListener*> *listeners,
- const struct addrinfo *ai)
- {
- const struct addrinfo *current;
- std::list<SocketListener*> new_listeners;
-
- initSockets();
-
- for (current = ai; current != NULL; current = current->ai_next) {
- switch (current->ai_family) {
- case AF_INET:
- if (!UseIPv4)
- continue;
- break;
-
- case AF_INET6:
- if (!UseIPv6)
- continue;
- break;
-
- default:
- continue;
- }
-
- try {
- new_listeners.push_back(new TcpListener(current->ai_addr,
- current->ai_addrlen));
- } catch (SocketException& e) {
- // Ignore this if it is due to lack of address family support on
- // the interface or on the system
- if (e.err != EADDRNOTAVAIL && e.err != EAFNOSUPPORT) {
- // Otherwise, report the error
- while (!new_listeners.empty()) {
- delete new_listeners.back();
- new_listeners.pop_back();
- }
- throw;
- }
- }
- }
-
- if (new_listeners.empty ())
- throw SocketException("createTcpListeners: no addresses available",
- EADDRNOTAVAIL);
-
- listeners->splice (listeners->end(), new_listeners);
- }
-
-
- TcpFilter::TcpFilter(const char* spec) {
- rfb::CharArray tmp;
- tmp.buf = rfb::strDup(spec);
- while (tmp.buf) {
- rfb::CharArray first;
- rfb::strSplit(tmp.buf, ',', &first.buf, &tmp.buf);
- if (strlen(first.buf))
- filter.push_back(parsePattern(first.buf));
- }
- }
-
- TcpFilter::~TcpFilter() {
- }
-
-
- static bool
- patternMatchIP(const TcpFilter::Pattern& pattern, vnc_sockaddr_t *sa) {
- switch (pattern.address.u.sa.sa_family) {
- unsigned long address;
-
- case AF_INET:
- if (sa->u.sa.sa_family != AF_INET)
- return false;
-
- address = sa->u.sin.sin_addr.s_addr;
- if (address == htonl (INADDR_NONE)) return false;
- return ((pattern.address.u.sin.sin_addr.s_addr &
- pattern.mask.u.sin.sin_addr.s_addr) ==
- (address & pattern.mask.u.sin.sin_addr.s_addr));
-
- case AF_INET6:
- if (sa->u.sa.sa_family != AF_INET6)
- return false;
-
- for (unsigned int n = 0; n < 16; n++) {
- unsigned int bits = (n + 1) * 8;
- unsigned int mask;
- if (pattern.prefixlen > bits)
- mask = 0xff;
- else {
- unsigned int lastbits = 0xff;
- lastbits <<= bits - pattern.prefixlen;
- mask = lastbits & 0xff;
- }
-
- if ((pattern.address.u.sin6.sin6_addr.s6_addr[n] & mask) !=
- (sa->u.sin6.sin6_addr.s6_addr[n] & mask))
- return false;
-
- if (mask < 0xff)
- break;
- }
-
- return true;
-
- case AF_UNSPEC:
- // Any address matches
- return true;
-
- default:
- break;
- }
-
- return false;
- }
-
- bool
- TcpFilter::verifyConnection(Socket* s) {
- rfb::CharArray name;
- vnc_sockaddr_t sa;
- socklen_t sa_size = sizeof(sa);
-
- if (getpeername(s->getFd(), &sa.u.sa, &sa_size) != 0)
- return false;
-
- name.buf = s->getPeerAddress();
- std::list<TcpFilter::Pattern>::iterator i;
- for (i=filter.begin(); i!=filter.end(); i++) {
- if (patternMatchIP(*i, &sa)) {
- switch ((*i).action) {
- case Accept:
- vlog.debug("ACCEPT %s", name.buf);
- return true;
- case Query:
- vlog.debug("QUERY %s", name.buf);
- s->setRequiresQuery();
- return true;
- case Reject:
- vlog.debug("REJECT %s", name.buf);
- return false;
- }
- }
- }
-
- vlog.debug("[REJECT] %s", name.buf);
- return false;
- }
-
-
- TcpFilter::Pattern TcpFilter::parsePattern(const char* p) {
- TcpFilter::Pattern pattern;
-
- rfb::CharArray addr, pref;
- bool prefix_specified;
- int family;
-
- initSockets();
-
- prefix_specified = rfb::strSplit(&p[1], '/', &addr.buf, &pref.buf);
- if (addr.buf[0] == '\0') {
- // Match any address
- memset (&pattern.address, 0, sizeof (pattern.address));
- pattern.address.u.sa.sa_family = AF_UNSPEC;
- pattern.prefixlen = 0;
- } else {
- struct addrinfo hints;
- struct addrinfo *ai;
- char *p = addr.buf;
- int result;
- memset (&hints, 0, sizeof (hints));
- hints.ai_family = AF_UNSPEC;
- hints.ai_flags = AI_NUMERICHOST;
-
- // Take out brackets, if present
- if (*p == '[') {
- size_t len;
- p++;
- len = strlen (p);
- if (len > 0 && p[len - 1] == ']')
- p[len - 1] = '\0';
- }
-
- if ((result = getaddrinfo (p, NULL, &hints, &ai)) != 0) {
- throw Exception("unable to resolve host by name: %s",
- gai_strerror(result));
- }
-
- memcpy (&pattern.address.u.sa, ai->ai_addr, ai->ai_addrlen);
- freeaddrinfo (ai);
-
- family = pattern.address.u.sa.sa_family;
-
- if (prefix_specified) {
- if (family == AF_INET &&
- rfb::strContains(pref.buf, '.')) {
- throw Exception("mask no longer supported for filter, "
- "use prefix instead");
- }
-
- pattern.prefixlen = (unsigned int) atoi(pref.buf);
- } else {
- switch (family) {
- case AF_INET:
- pattern.prefixlen = 32;
- break;
- case AF_INET6:
- pattern.prefixlen = 128;
- break;
- default:
- throw Exception("unknown address family");
- }
- }
- }
-
- family = pattern.address.u.sa.sa_family;
-
- if (pattern.prefixlen > (family == AF_INET ? 32: 128))
- throw Exception("invalid prefix length for filter address: %u",
- pattern.prefixlen);
-
- // Compute mask from address and prefix length
- memset (&pattern.mask, 0, sizeof (pattern.mask));
- switch (family) {
- unsigned long mask;
- case AF_INET:
- mask = 0;
- for (unsigned int i=0; i<pattern.prefixlen; i++)
- mask |= 1<<(31-i);
- pattern.mask.u.sin.sin_addr.s_addr = htonl(mask);
- break;
-
- case AF_INET6:
- for (unsigned int n = 0; n < 16; n++) {
- unsigned int bits = (n + 1) * 8;
- if (pattern.prefixlen > bits)
- pattern.mask.u.sin6.sin6_addr.s6_addr[n] = 0xff;
- else {
- unsigned int lastbits = 0xff;
- lastbits <<= bits - pattern.prefixlen;
- pattern.mask.u.sin6.sin6_addr.s6_addr[n] = lastbits & 0xff;
- break;
- }
- }
- break;
- case AF_UNSPEC:
- // No mask to compute
- break;
- default:
- ; /* not reached */
- }
-
- switch(p[0]) {
- case '+': pattern.action = TcpFilter::Accept; break;
- case '-': pattern.action = TcpFilter::Reject; break;
- case '?': pattern.action = TcpFilter::Query; break;
- };
-
- return pattern;
- }
-
- char* TcpFilter::patternToStr(const TcpFilter::Pattern& p) {
- rfb::CharArray addr;
- char buffer[INET6_ADDRSTRLEN + 2];
-
- if (p.address.u.sa.sa_family == AF_INET) {
- getnameinfo(&p.address.u.sa, sizeof(p.address.u.sin),
- buffer, sizeof (buffer), NULL, 0, NI_NUMERICHOST);
- addr.buf = rfb::strDup(buffer);
- } else if (p.address.u.sa.sa_family == AF_INET6) {
- buffer[0] = '[';
- getnameinfo(&p.address.u.sa, sizeof(p.address.u.sin6),
- buffer + 1, sizeof (buffer) - 2, NULL, 0, NI_NUMERICHOST);
- strcat(buffer, "]");
- addr.buf = rfb::strDup(buffer);
- } else
- addr.buf = rfb::strDup("");
-
- char action;
- switch (p.action) {
- case Accept: action = '+'; break;
- case Reject: action = '-'; break;
- default:
- case Query: action = '?'; break;
- };
- size_t resultlen = (1 // action
- + strlen (addr.buf) // address
- + 1 // slash
- + 3 // prefix length, max 128
- + 1); // terminating nul
- char* result = new char[resultlen];
- if (addr.buf[0] == '\0')
- snprintf(result, resultlen, "%c", action);
- else
- snprintf(result, resultlen, "%c%s/%u", action, addr.buf, p.prefixlen);
-
- return result;
- }
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