/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd: (C) 2002-2009 InspIRCd Development Team * See: http://www.inspircd.org/wiki/index.php/Credits * * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ /* $Core */ #include "socket.h" #include "inspstring.h" #include "socketengine.h" #include "inspircd.h" bool BufferedSocket::Readable() { return (this->state != I_CONNECTING); } BufferedSocket::BufferedSocket(InspIRCd* SI) { this->Timeout = NULL; this->state = I_DISCONNECTED; this->fd = -1; this->ServerInstance = SI; } BufferedSocket::BufferedSocket(InspIRCd* SI, int newfd, const char* ip) { this->Timeout = NULL; this->fd = newfd; this->state = I_CONNECTED; strlcpy(this->IP,ip,MAXBUF); this->ServerInstance = SI; if (this->fd > -1) this->ServerInstance->SE->AddFd(this); } BufferedSocket::BufferedSocket(InspIRCd* SI, const std::string &ipaddr, int aport, unsigned long maxtime, const std::string &connectbindip) { this->cbindip = connectbindip; this->fd = -1; this->ServerInstance = SI; strlcpy(host,ipaddr.c_str(),MAXBUF); this->Timeout = NULL; strlcpy(this->host,ipaddr.c_str(),MAXBUF); this->port = aport; bool ipvalid = true; #ifdef IPV6 if (strchr(host,':')) { in6_addr n; if (inet_pton(AF_INET6, host, &n) < 1) ipvalid = false; } else #endif { in_addr n; if (inet_aton(host,&n) < 1) ipvalid = false; } if (!ipvalid) { this->ServerInstance->Logs->Log("SOCKET", DEBUG,"BUG: Hostname passed to BufferedSocket, rather than an IP address!"); this->OnError(I_ERR_CONNECT); this->Close(); this->fd = -1; this->state = I_ERROR; return; } else { strlcpy(this->IP,host,MAXBUF); if (!this->DoConnect(maxtime)) { this->OnError(I_ERR_CONNECT); this->Close(); this->fd = -1; this->state = I_ERROR; return; } } } void BufferedSocket::SetQueues() { // attempt to increase socket sendq and recvq as high as its possible int sendbuf = 32768; int recvbuf = 32768; if(setsockopt(this->fd,SOL_SOCKET,SO_SNDBUF,(const char *)&sendbuf,sizeof(sendbuf)) || setsockopt(this->fd,SOL_SOCKET,SO_RCVBUF,(const char *)&recvbuf,sizeof(sendbuf))) { //this->ServerInstance->Log(DEFAULT, "Could not increase SO_SNDBUF/SO_RCVBUF for socket %u", GetFd()); ; // do nothing. I'm a little sick of people trying to interpret this message as a result of why their incorrect setups don't work. } } bool BufferedSocket::DoBindMagic(const std::string ¤t_ip, bool v6) { /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */ socklen_t size = sizeof(sockaddr_in); sockaddr* s = new sockaddr[2]; #ifdef IPV6 if (v6) { in6_addr n; if (inet_pton(AF_INET6, current_ip.c_str(), &n) > 0) { memcpy(&((sockaddr_in6*)s)->sin6_addr, &n, sizeof(sockaddr_in6)); ((sockaddr_in6*)s)->sin6_port = 0; ((sockaddr_in6*)s)->sin6_family = AF_INET6; size = sizeof(sockaddr_in6); } else { // Well, this is as good as it's gonna get. errno = EADDRNOTAVAIL; delete[] s; return false; } } else #endif { in_addr n; if (inet_aton(current_ip.c_str(), &n) > 0) { ((sockaddr_in*)s)->sin_addr = n; ((sockaddr_in*)s)->sin_port = 0; ((sockaddr_in*)s)->sin_family = AF_INET; } else { // Well, this is as good as it's gonna get. errno = EADDRNOTAVAIL; delete[] s; return false; } } if (ServerInstance->SE->Bind(this->fd, s, size) < 0) { this->state = I_ERROR; this->OnError(I_ERR_BIND); delete[] s; return false; } delete[] s; return true; } /* Most irc servers require you to specify the ip you want to bind to. * If you dont specify an IP, they rather dumbly bind to the first IP * of the box (e.g. INADDR_ANY). In InspIRCd, we scan thought the IP * addresses we've bound server ports to, and we try and bind our outbound * connections to the first usable non-loopback and non-any IP we find. * This is easier to configure when you have a lot of links and a lot * of servers to configure. */ bool BufferedSocket::BindAddr(const std::string &ip_to_bind) { ConfigReader Conf(this->ServerInstance); bool v6 = false; #ifdef IPV6 /* Are we looking for a binding to fit an ipv6 host? */ if ((ip_to_bind.empty()) || (ip_to_bind.find(':') != std::string::npos)) v6 = true; #endif // Case one: If they provided an IP, try bind it if (!ip_to_bind.empty()) { // And if it fails, don't do anything. return this->DoBindMagic(ip_to_bind, v6); } for (int j = 0; j < Conf.Enumerate("bind"); j++) { // We only want to try bind to a server ip. if (Conf.ReadValue("bind","type",j) != "servers") continue; // set current IP to the tag std::string current_ip = Conf.ReadValue("bind","address",j); // Make sure IP is nothing local if (current_ip == "*" || current_ip == "127.0.0.1" || current_ip.empty() || current_ip == "::1") continue; // Try bind, don't fail if it doesn't bind though. if (this->DoBindMagic(current_ip, v6)) return true; } // NOTE: You may wonder WTF we are returning *true* here, but that is because there were no custom binds setup, and so we have nothing to do // (remember, outgoing connections without binding are perfectly ok). ServerInstance->Logs->Log("SOCKET", DEBUG,"nothing in the config to bind()!"); return true; } bool BufferedSocket::DoConnect(unsigned long maxtime) { /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */ sockaddr* addr = new sockaddr[2]; socklen_t size = sizeof(sockaddr_in); #ifdef IPV6 bool v6 = false; if ((!*this->host) || strchr(this->host, ':')) v6 = true; if (v6) { this->fd = socket(AF_INET6, SOCK_STREAM, 0); if ((this->fd > -1) && ((strstr(this->IP,"::ffff:") != (char*)&this->IP) && (strstr(this->IP,"::FFFF:") != (char*)&this->IP))) { if (!this->BindAddr(this->cbindip)) { this->Close(); this->fd = -1; delete[] addr; return false; } } } else #endif { this->fd = socket(AF_INET, SOCK_STREAM, 0); if (this->fd > -1) { if (!this->BindAddr(this->cbindip)) { this->Close(); this->fd = -1; delete[] addr; return false; } } } if (this->fd == -1) { this->state = I_ERROR; this->OnError(I_ERR_SOCKET); delete[] addr; return false; } #ifdef IPV6 if (v6) { in6_addr addy; if (inet_pton(AF_INET6, this->host, &addy) > 0) { ((sockaddr_in6*)addr)->sin6_family = AF_INET6; memcpy(&((sockaddr_in6*)addr)->sin6_addr, &addy, sizeof(addy)); ((sockaddr_in6*)addr)->sin6_port = htons(this->port); size = sizeof(sockaddr_in6); } } else #endif { in_addr addy; if (inet_aton(this->host, &addy) > 0) { ((sockaddr_in*)addr)->sin_family = AF_INET; ((sockaddr_in*)addr)->sin_addr = addy; ((sockaddr_in*)addr)->sin_port = htons(this->port); } } ServerInstance->SE->NonBlocking(this->fd); if (ServerInstance->SE->Connect(this, (sockaddr*)addr, size) == -1) { if (errno != EINPROGRESS) { this->OnError(I_ERR_CONNECT); this->Close(); this->state = I_ERROR; delete[] addr; return false; } this->Timeout = new SocketTimeout(this->GetFd(), this->ServerInstance, this, maxtime, this->ServerInstance->Time()); this->ServerInstance->Timers->AddTimer(this->Timeout); } this->state = I_CONNECTING; delete[] addr; if (this->fd > -1) { if (!this->ServerInstance->SE->AddFd(this)) { this->OnError(I_ERR_NOMOREFDS); this->Close(); this->state = I_ERROR; return false; } this->SetQueues(); } ServerInstance->Logs->Log("SOCKET", DEBUG,"BufferedSocket::DoConnect success"); return true; } void BufferedSocket::Close() { /* Save this, so we dont lose it, * otherise on failure, error messages * might be inaccurate. */ int save = errno; if (this->fd > -1) { if (this->GetIOHook()) { try { this->GetIOHook()->OnRawSocketClose(this->fd); } catch (CoreException& modexcept) { ServerInstance->Logs->Log("SOCKET", DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason()); } } ServerInstance->SE->Shutdown(this, 2); if (ServerInstance->SE->Close(this) != -1) this->OnClose(); if (ServerInstance->SocketCull.find(this) == ServerInstance->SocketCull.end()) ServerInstance->SocketCull[this] = this; } errno = save; } std::string BufferedSocket::GetIP() { return this->IP; } const char* BufferedSocket::Read() { if (!ServerInstance->SE->BoundsCheckFd(this)) return NULL; int n = 0; char* ReadBuffer = ServerInstance->GetReadBuffer(); if (this->GetIOHook()) { int result2 = 0; int MOD_RESULT = 0; try { MOD_RESULT = this->GetIOHook()->OnRawSocketRead(this->fd, ReadBuffer, ServerInstance->Config->NetBufferSize, result2); } catch (CoreException& modexcept) { ServerInstance->Logs->Log("SOCKET", DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason()); } if (MOD_RESULT < 0) { n = -1; errno = EAGAIN; } else { n = result2; } } else { n = recv(this->fd, ReadBuffer, ServerInstance->Config->NetBufferSize, 0); } /* * This used to do some silly bounds checking instead of just passing bufsize - 1 to recv. * Not only does that make absolutely no sense, but it could potentially result in a read buffer's worth * of data being thrown into the bit bucket for no good reason, which is just *stupid*.. do things correctly now. * --w00t (july 2, 2008) */ if (n > 0) { ReadBuffer[n] = 0; return ReadBuffer; } else { int err = errno; if (err == EAGAIN) return ""; else return NULL; } } /* * This function formerly tried to flush write buffer each call. * While admirable in attempting to get the data out to wherever * it is going, on a full socket, it's just going to syscall write() and * EAGAIN constantly, instead of waiting in the SE to know if it can write * which will chew a bit of CPU. * * So, now this function returns void (take note) and just adds to the sendq. * * It'll get written at a determinate point when the socketengine tells us it can write. * -- w00t (april 1, 2008) */ void BufferedSocket::Write(const std::string &data) { /* Append the data to the back of the queue ready for writing */ outbuffer.push_back(data); /* Mark ourselves as wanting write */ this->ServerInstance->SE->WantWrite(this); } bool BufferedSocket::FlushWriteBuffer() { errno = 0; if ((this->fd > -1) && (this->state == I_CONNECTED)) { if (this->GetIOHook()) { while (outbuffer.size() && (errno != EAGAIN)) { try { /* XXX: The lack of buffering here is NOT a bug, modules implementing this interface have to * implement their own buffering mechanisms */ this->GetIOHook()->OnRawSocketWrite(this->fd, outbuffer[0].c_str(), outbuffer[0].length()); outbuffer.pop_front(); } catch (CoreException& modexcept) { ServerInstance->Logs->Log("SOCKET", DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason()); return true; } } } else { /* If we have multiple lines, try to send them all, * not just the first one -- Brain */ while (outbuffer.size() && (errno != EAGAIN)) { /* Send a line */ int result = ServerInstance->SE->Send(this, outbuffer[0].c_str(), outbuffer[0].length(), 0); if (result > 0) { if ((unsigned int)result >= outbuffer[0].length()) { /* The whole block was written (usually a line) * Pop the block off the front of the queue, * dont set errno, because we are clear of errors * and want to try and write the next block too. */ outbuffer.pop_front(); } else { std::string temp = outbuffer[0].substr(result); outbuffer[0] = temp; /* We didnt get the whole line out. arses. * Try again next time, i guess. Set errno, * because we shouldnt be writing any more now, * until the socketengine says its safe to do so. */ errno = EAGAIN; } } else if (result == 0) { this->ServerInstance->SE->DelFd(this); this->Close(); return true; } else if ((result == -1) && (errno != EAGAIN)) { this->OnError(I_ERR_WRITE); this->state = I_ERROR; this->ServerInstance->SE->DelFd(this); this->Close(); return true; } } } } if ((errno == EAGAIN) && (fd > -1)) { this->ServerInstance->SE->WantWrite(this); } return (fd < 0); } void SocketTimeout::Tick(time_t) { ServerInstance->Logs->Log("SOCKET", DEBUG,"SocketTimeout::Tick"); if (ServerInstance->SE->GetRef(this->sfd) != this->sock) return; if (this->sock->state == I_CONNECTING) { // for connecting sockets, the timeout can occur // which causes termination of the connection after // the given number of seconds without a successful // connection. this->sock->OnTimeout(); this->sock->OnError(I_ERR_TIMEOUT); /* NOTE: We must set this AFTER DelFd, as we added * this socket whilst writeable. This means that we * must DELETE the socket whilst writeable too! */ this->sock->state = I_ERROR; if (ServerInstance->SocketCull.find(this->sock) == ServerInstance->SocketCull.end()) ServerInstance->SocketCull[this->sock] = this->sock; } this->sock->Timeout = NULL; } bool BufferedSocket::InternalMarkConnected() { /* Our socket was in write-state, so delete it and re-add it * in read-state. */ this->SetState(I_CONNECTED); if (this->GetIOHook()) { ServerInstance->Logs->Log("SOCKET",DEBUG,"Hook for raw connect"); try { this->GetIOHook()->OnRawSocketConnect(this->fd); } catch (CoreException& modexcept) { ServerInstance->Logs->Log("SOCKET",DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason()); return false; } } return this->OnConnected(); } void BufferedSocket::SetState(BufferedSocketState s) { this->state = s; } BufferedSocketState BufferedSocket::GetState() { return this->state; } bool BufferedSocket::OnConnected() { return true; } void BufferedSocket::OnError(BufferedSocketError) { return; } int BufferedSocket::OnDisconnect() { return 0; } bool BufferedSocket::OnDataReady() { return true; } bool BufferedSocket::OnWriteReady() { // Default behaviour: just try write some. return !this->FlushWriteBuffer(); } void BufferedSocket::OnTimeout() { return; } void BufferedSocket::OnClose() { return; } BufferedSocket::~BufferedSocket() { this->Close(); if (Timeout) { ServerInstance->Timers->DelTimer(Timeout); Timeout = NULL; } } void BufferedSocket::HandleEvent(EventType et, int errornum) { switch (et) { case EVENT_ERROR: { switch (errornum) { case ETIMEDOUT: this->OnError(I_ERR_TIMEOUT); break; case ECONNREFUSED: case 0: this->OnError(this->state == I_CONNECTING ? I_ERR_CONNECT : I_ERR_WRITE); break; case EADDRINUSE: this->OnError(I_ERR_BIND); break; case EPIPE: case EIO: this->OnError(I_ERR_WRITE); break; } if (this->ServerInstance->SocketCull.find(this) == this->ServerInstance->SocketCull.end()) this->ServerInstance->SocketCull[this] = this; return; break; } case EVENT_READ: { if (!this->OnDataReady()) { if (this->ServerInstance->SocketCull.find(this) == this->ServerInstance->SocketCull.end()) this->ServerInstance->SocketCull[this] = this; return; } break; } case EVENT_WRITE: { if (this->state == I_CONNECTING) { if (!this->InternalMarkConnected()) { if (this->ServerInstance->SocketCull.find(this) == this->ServerInstance->SocketCull.end()) this->ServerInstance->SocketCull[this] = this; return; } return; } else { if (!this->OnWriteReady()) { if (this->ServerInstance->SocketCull.find(this) == this->ServerInstance->SocketCull.end()) this->ServerInstance->SocketCull[this] = this; return; } } break; } } }