// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: ftp.cc,v 1.31.2.1 2004/01/16 18:58:50 mdz Exp $ /* ###################################################################### FTP Acquire Method - This is the FTP acquire method for APT. This is a very simple implementation that does not try to optimize at all. Commands are sent synchronously with the FTP server (as the rfc recommends, but it is not really necessary..) and no tricks are done to speed things along. RFC 2428 describes the IPv6 FTP behavior ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include // Internet stuff #include #include #include #include "connect.h" #include "ftp.h" #include "rfc2553emu.h" #include /*}}}*/ using namespace std; /* This table is for the EPRT and EPSV commands, it maps the OS address family to the IETF address families */ struct AFMap { unsigned long Family; unsigned long IETFFamily; }; #ifndef AF_INET6 struct AFMap AFMap[] = {{AF_INET,1},{0, 0}}; #else struct AFMap AFMap[] = {{AF_INET,1},{AF_INET6,2},{0, 0}}; #endif unsigned long TimeOut = 30; URI Proxy; string FtpMethod::FailFile; int FtpMethod::FailFd = -1; time_t FtpMethod::FailTime = 0; // FTPConn::FTPConn - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ FTPConn::FTPConn(URI Srv) : Len(0), ServerFd(MethodFd::FromFd(-1)), DataFd(-1), DataListenFd(-1), ServerName(Srv), ForceExtended(false), TryPassive(true), PeerAddrLen(0), ServerAddrLen(0) { Debug = _config->FindB("Debug::Acquire::Ftp",false); PasvAddr = 0; Buffer[0] = '\0'; } /*}}}*/ // FTPConn::~FTPConn - Destructor /*{{{*/ // --------------------------------------------------------------------- /* */ FTPConn::~FTPConn() { Close(); } /*}}}*/ // FTPConn::Close - Close down the connection /*{{{*/ // --------------------------------------------------------------------- /* Just tear down the socket and data socket */ void FTPConn::Close() { ServerFd->Close(); close(DataFd); DataFd = -1; close(DataListenFd); DataListenFd = -1; if (PasvAddr != 0) freeaddrinfo(PasvAddr); PasvAddr = 0; } /*}}}*/ // FTPConn::Open - Open a new connection /*{{{*/ // --------------------------------------------------------------------- /* Connect to the server using a non-blocking connection and perform a login. */ ResultState FTPConn::Open(aptMethod *Owner) { // Use the already open connection if possible. if (ServerFd->Fd() != -1) return ResultState::SUCCESSFUL; Close(); // Determine the proxy setting string SpecificProxy = _config->Find("Acquire::ftp::Proxy::" + ServerName.Host); if (!SpecificProxy.empty()) { if (SpecificProxy == "DIRECT") Proxy = ""; else Proxy = SpecificProxy; } else { string DefProxy = _config->Find("Acquire::ftp::Proxy"); if (!DefProxy.empty()) { Proxy = DefProxy; } else { char* result = getenv("ftp_proxy"); Proxy = result ? result : ""; } } // Parse no_proxy, a , separated list of domains if (getenv("no_proxy") != 0) { if (CheckDomainList(ServerName.Host,getenv("no_proxy")) == true) Proxy = ""; } // Determine what host and port to use based on the proxy settings int Port = 0; string Host; if (Proxy.empty() == true) { if (ServerName.Port != 0) Port = ServerName.Port; Host = ServerName.Host; } else { if (Proxy.Port != 0) Port = Proxy.Port; Host = Proxy.Host; } /* Connect to the remote server. Since FTP is connection oriented we want to make sure we get a new server every time we reconnect */ RotateDNS(); auto result = Connect(Host, Port, "ftp", 21, ServerFd, TimeOut, Owner); if (result != ResultState::SUCCESSFUL) return result; // Login must be before getpeername otherwise dante won't work. Owner->Status(_("Logging in")); result = Login(); if (result != ResultState::SUCCESSFUL) return result; // Get the remote server's address PeerAddrLen = sizeof(PeerAddr); if (getpeername(ServerFd->Fd(), (sockaddr *)&PeerAddr, &PeerAddrLen) != 0) { _error->Errno("getpeername", _("Unable to determine the peer name")); return ResultState::TRANSIENT_ERROR; } // Get the local machine's address ServerAddrLen = sizeof(ServerAddr); if (getsockname(ServerFd->Fd(), (sockaddr *)&ServerAddr, &ServerAddrLen) != 0) { _error->Errno("getsockname", _("Unable to determine the local name")); return ResultState::TRANSIENT_ERROR; } return ResultState::SUCCESSFUL; } /*}}}*/ // FTPConn::Login - Login to the remote server /*{{{*/ // --------------------------------------------------------------------- /* This performs both normal login and proxy login using a simples script stored in the config file. */ ResultState FTPConn::Login() { unsigned int Tag; string Msg; // Setup the variables needed for authentication string User = "anonymous"; string Pass = "apt_get_ftp_2.1@debian.linux.user"; // Fill in the user/pass if (ServerName.User.empty() == false) User = ServerName.User; if (ServerName.Password.empty() == false) Pass = ServerName.Password; // Perform simple login if (Proxy.empty() == true) { // Read the initial response if (ReadResp(Tag,Msg) == false) return ResultState::TRANSIENT_ERROR; if (Tag >= 400) { _error->Error(_("The server refused the connection and said: %s"), Msg.c_str()); return ResultState::FATAL_ERROR; } // Send the user if (WriteMsg(Tag,Msg,"USER %s",User.c_str()) == false) return ResultState::TRANSIENT_ERROR; if (Tag >= 400) { _error->Error(_("USER failed, server said: %s"), Msg.c_str()); return ResultState::FATAL_ERROR; } if (Tag == 331) { // 331 User name okay, need password. // Send the Password if (WriteMsg(Tag,Msg,"PASS %s",Pass.c_str()) == false) return ResultState::TRANSIENT_ERROR; if (Tag >= 400) { _error->Error(_("PASS failed, server said: %s"), Msg.c_str()); return ResultState::FATAL_ERROR; } } // Enter passive mode if (_config->Exists("Acquire::FTP::Passive::" + ServerName.Host) == true) TryPassive = _config->FindB("Acquire::FTP::Passive::" + ServerName.Host,true); else TryPassive = _config->FindB("Acquire::FTP::Passive",true); } else { // Read the initial response if (ReadResp(Tag,Msg) == false) return ResultState::TRANSIENT_ERROR; if (Tag >= 400) { _error->Error(_("The server refused the connection and said: %s"), Msg.c_str()); return ResultState::TRANSIENT_ERROR; } // Perform proxy script execution Configuration::Item const *Opts = _config->Tree("Acquire::ftp::ProxyLogin"); if (Opts == 0 || Opts->Child == 0) { _error->Error(_("A proxy server was specified but no login " "script, Acquire::ftp::ProxyLogin is empty.")); return ResultState::FATAL_ERROR; } Opts = Opts->Child; // Iterate over the entire login script for (; Opts != 0; Opts = Opts->Next) { if (Opts->Value.empty() == true) continue; // Substitute the variables into the command string Tmp = Opts->Value; Tmp = SubstVar(Tmp,"$(PROXY_USER)",Proxy.User); Tmp = SubstVar(Tmp,"$(PROXY_PASS)",Proxy.Password); Tmp = SubstVar(Tmp,"$(SITE_USER)",User); Tmp = SubstVar(Tmp,"$(SITE_PASS)",Pass); if (ServerName.Port != 0) { std::string SitePort; strprintf(SitePort, "%u", ServerName.Port); Tmp = SubstVar(Tmp,"$(SITE_PORT)", SitePort); } else Tmp = SubstVar(Tmp,"$(SITE_PORT)", "21"); Tmp = SubstVar(Tmp,"$(SITE)",ServerName.Host); // Send the command if (WriteMsg(Tag,Msg,"%s",Tmp.c_str()) == false) return ResultState::TRANSIENT_ERROR; if (Tag >= 400) { _error->Error(_("Login script command '%s' failed, server said: %s"), Tmp.c_str(), Msg.c_str()); return ResultState::FATAL_ERROR; } } // Enter passive mode TryPassive = false; if (_config->Exists("Acquire::FTP::Passive::" + ServerName.Host) == true) TryPassive = _config->FindB("Acquire::FTP::Passive::" + ServerName.Host,true); else { if (_config->Exists("Acquire::FTP::Proxy::Passive") == true) TryPassive = _config->FindB("Acquire::FTP::Proxy::Passive",true); else TryPassive = _config->FindB("Acquire::FTP::Passive",true); } } // Force the use of extended commands if (_config->Exists("Acquire::FTP::ForceExtended::" + ServerName.Host) == true) ForceExtended = _config->FindB("Acquire::FTP::ForceExtended::" + ServerName.Host,true); else ForceExtended = _config->FindB("Acquire::FTP::ForceExtended",false); // Binary mode if (WriteMsg(Tag,Msg,"TYPE I") == false) return ResultState::TRANSIENT_ERROR; if (Tag >= 400) { _error->Error(_("TYPE failed, server said: %s"), Msg.c_str()); return ResultState::FATAL_ERROR; } return ResultState::SUCCESSFUL; } /*}}}*/ // FTPConn::ReadLine - Read a line from the server /*{{{*/ // --------------------------------------------------------------------- /* This performs a very simple buffered read. */ bool FTPConn::ReadLine(string &Text) { if (ServerFd->Fd() == -1) return false; // Suck in a line while (Len < sizeof(Buffer)) { // Scan the buffer for a new line for (unsigned int I = 0; I != Len; I++) { // Escape some special chars if (Buffer[I] == 0) Buffer[I] = '?'; // End of line? if (Buffer[I] != '\n') continue; I++; Text = string(Buffer,I); memmove(Buffer,Buffer+I,Len - I); Len -= I; return true; } // Wait for some data.. if (WaitFd(ServerFd->Fd(), false, TimeOut) == false) { Close(); return _error->Error(_("Connection timeout")); } // Suck it back int Res = ServerFd->Read(Buffer + Len, sizeof(Buffer) - Len); if (Res == 0) _error->Error(_("Server closed the connection")); if (Res <= 0) { _error->Errno("read",_("Read error")); Close(); return false; } Len += Res; } return _error->Error(_("A response overflowed the buffer.")); } /*}}}*/ // FTPConn::ReadResp - Read a full response from the server /*{{{*/ // --------------------------------------------------------------------- /* This reads a reply code from the server, it handles both p */ bool FTPConn::ReadResp(unsigned int &Ret,string &Text) { // Grab the first line of the response string Msg; if (ReadLine(Msg) == false) return false; // Get the ID code char *End; Ret = strtol(Msg.c_str(),&End,10); if (End - Msg.c_str() != 3) return _error->Error(_("Protocol corruption")); // All done ? Text = Msg.c_str()+4; if (*End == ' ') { if (Debug == true) cerr << "<- '" << QuoteString(Text,"") << "'" << endl; return true; } if (*End != '-') return _error->Error(_("Protocol corruption")); /* Okay, here we do the continued message trick. This is foolish, but proftpd follows the protocol as specified and wu-ftpd doesn't, so we filter. I wonder how many clients break if you use proftpd and put a '- in the 3rd spot in the message? */ char Leader[4]; strncpy(Leader,Msg.c_str(),3); Leader[3] = 0; while (ReadLine(Msg) == true) { // Short, it must be using RFC continuation.. if (Msg.length() < 4) { Text += Msg; continue; } // Oops, finished if (strncmp(Msg.c_str(),Leader,3) == 0 && Msg[3] == ' ') { Text += Msg.c_str()+4; break; } // This message has the wu-ftpd style reply code prefixed if (strncmp(Msg.c_str(),Leader,3) == 0 && Msg[3] == '-') { Text += Msg.c_str()+4; continue; } // Must be RFC style prefixing Text += Msg; } if (Debug == true && _error->PendingError() == false) cerr << "<- '" << QuoteString(Text,"") << "'" << endl; return !_error->PendingError(); } /*}}}*/ // FTPConn::WriteMsg - Send a message to the server /*{{{*/ // --------------------------------------------------------------------- /* Simple printf like function.. */ bool FTPConn::WriteMsg(unsigned int &Ret,string &Text,const char *Fmt,...) { va_list args; va_start(args,Fmt); // sprintf the description char S[400]; vsnprintf(S,sizeof(S) - 4,Fmt,args); strcat(S,"\r\n"); va_end(args); if (Debug == true) cerr << "-> '" << QuoteString(S,"") << "'" << endl; // Send it off unsigned long Len = strlen(S); unsigned long Start = 0; while (Len != 0) { if (WaitFd(ServerFd->Fd(), true, TimeOut) == false) { Close(); return _error->Error(_("Connection timeout")); } int Res = ServerFd->Write(S + Start, Len); if (Res <= 0) { _error->Errno("write",_("Write error")); Close(); return false; } Len -= Res; Start += Res; } return ReadResp(Ret,Text); } /*}}}*/ // FTPConn::GoPasv - Enter Passive mode /*{{{*/ // --------------------------------------------------------------------- /* Try to enter passive mode, the return code does not indicate if passive mode could or could not be established, only if there was a fatal error. We have to enter passive mode every time we make a data connection :| */ bool FTPConn::GoPasv() { /* The PASV command only works on IPv4 sockets, even though it could in theory suppory IPv6 via an all zeros reply */ if (((struct sockaddr *)&PeerAddr)->sa_family != AF_INET || ForceExtended == true) return ExtGoPasv(); if (PasvAddr != 0) freeaddrinfo(PasvAddr); PasvAddr = 0; // Try to enable pasv mode unsigned int Tag; string Msg; if (WriteMsg(Tag,Msg,"PASV") == false) return false; // Unsupported function string::size_type Pos = Msg.find('('); if (Tag >= 400) return true; //wu-2.6.2(1) ftp server, returns //227 Entering Passive Mode 193,219,28,140,150,111 //without parentheses, let's try to cope with it. //wget(1) and ftp(1) can. if (Pos == string::npos) Pos = Msg.rfind(' '); else ++Pos; // Still unsupported function if (Pos == string::npos) return true; // Scan it unsigned a0,a1,a2,a3,p0,p1; if (sscanf(Msg.c_str() + Pos,"%u,%u,%u,%u,%u,%u",&a0,&a1,&a2,&a3,&p0,&p1) != 6) return true; /* Some evil servers return 0 to mean their addr. We can actually speak to these servers natively using IPv6 */ if (a0 == 0 && a1 == 0 && a2 == 0 && a3 == 0) { // Get the IP in text form char Name[NI_MAXHOST]; char Service[NI_MAXSERV]; getnameinfo((struct sockaddr *)&PeerAddr,PeerAddrLen, Name,sizeof(Name),Service,sizeof(Service), NI_NUMERICHOST|NI_NUMERICSERV); struct addrinfo Hints; memset(&Hints,0,sizeof(Hints)); Hints.ai_socktype = SOCK_STREAM; Hints.ai_family = ((struct sockaddr *)&PeerAddr)->sa_family; Hints.ai_flags |= AI_NUMERICHOST; // Get a new passive address. char Port[100]; snprintf(Port,sizeof(Port),"%u",(p0 << 8) + p1); if (getaddrinfo(Name,Port,&Hints,&PasvAddr) != 0) return true; return true; } struct addrinfo Hints; memset(&Hints,0,sizeof(Hints)); Hints.ai_socktype = SOCK_STREAM; Hints.ai_family = AF_INET; Hints.ai_flags |= AI_NUMERICHOST; // Get a new passive address. char Port[100]; snprintf(Port,sizeof(Port),"%u",(p0 << 8) + p1); char Name[100]; snprintf(Name,sizeof(Name),"%u.%u.%u.%u",a0,a1,a2,a3); if (getaddrinfo(Name,Port,&Hints,&PasvAddr) != 0) return true; return true; } /*}}}*/ // FTPConn::ExtGoPasv - Enter Extended Passive mode /*{{{*/ // --------------------------------------------------------------------- /* Try to enter extended passive mode. See GoPasv above and RFC 2428 */ bool FTPConn::ExtGoPasv() { if (PasvAddr != 0) freeaddrinfo(PasvAddr); PasvAddr = 0; // Try to enable pasv mode unsigned int Tag; string Msg; if (WriteMsg(Tag,Msg,"EPSV") == false) return false; // Unsupported function string::size_type Pos = Msg.find('('); if (Tag >= 400 || Pos == string::npos) return true; // Scan it string::const_iterator List[4]; unsigned Count = 0; Pos++; for (string::const_iterator I = Msg.begin() + Pos; I < Msg.end(); ++I) { if (*I != Msg[Pos]) continue; if (Count >= 4) return true; List[Count++] = I; } if (Count != 4) return true; // Break it up .. unsigned long Proto = 0; unsigned long Port = 0; string IP; IP = string(List[1]+1,List[2]); Port = atoi(string(List[2]+1,List[3]).c_str()); if (IP.empty() == false) Proto = atoi(string(List[0]+1,List[1]).c_str()); if (Port == 0) return false; // String version of the port char PStr[100]; snprintf(PStr,sizeof(PStr),"%lu",Port); // Get the IP in text form struct addrinfo Hints; memset(&Hints,0,sizeof(Hints)); Hints.ai_socktype = SOCK_STREAM; Hints.ai_flags |= AI_NUMERICHOST; /* The RFC defined case, connect to the old IP/protocol using the new port. */ if (IP.empty() == true) { // Get the IP in text form char Name[NI_MAXHOST]; char Service[NI_MAXSERV]; getnameinfo((struct sockaddr *)&PeerAddr,PeerAddrLen, Name,sizeof(Name),Service,sizeof(Service), NI_NUMERICHOST|NI_NUMERICSERV); IP = Name; Hints.ai_family = ((struct sockaddr *)&PeerAddr)->sa_family; } else { // Get the family.. Hints.ai_family = 0; for (unsigned J = 0; AFMap[J].Family != 0; J++) if (AFMap[J].IETFFamily == Proto) Hints.ai_family = AFMap[J].Family; if (Hints.ai_family == 0) return true; } // Get a new passive address. if (getaddrinfo(IP.c_str(),PStr,&Hints,&PasvAddr) != 0) return true; return true; } /*}}}*/ // FTPConn::Size - Return the size of a file /*{{{*/ // --------------------------------------------------------------------- /* Grab the file size from the server, 0 means no size or empty file */ bool FTPConn::Size(const char *Path,unsigned long long &Size) { // Query the size unsigned int Tag; string Msg; Size = 0; if (WriteMsg(Tag,Msg,"SIZE %s",Path) == false) return false; char *End; Size = strtoull(Msg.c_str(),&End,10); if (Tag >= 400 || End == Msg.c_str()) Size = 0; return true; } /*}}}*/ // FTPConn::ModTime - Return the modification time of the file /*{{{*/ // --------------------------------------------------------------------- /* Like Size no error is returned if the command is not supported. If the command fails then time is set to the current time of day to fool date checks. */ bool FTPConn::ModTime(const char *Path, time_t &Time) { Time = time(&Time); // Query the mod time unsigned int Tag; string Msg; if (WriteMsg(Tag,Msg,"MDTM %s",Path) == false) return false; if (Tag >= 400 || Msg.empty() == true || isdigit(Msg[0]) == 0) return true; // Parse it return FTPMDTMStrToTime(Msg.c_str(), Time); } /*}}}*/ // FTPConn::CreateDataFd - Get a data connection /*{{{*/ // --------------------------------------------------------------------- /* Create the data connection. Call FinalizeDataFd after this though.. */ bool FTPConn::CreateDataFd() { close(DataFd); DataFd = -1; // Attempt to enter passive mode. if (TryPassive == true) { if (GoPasv() == false) return false; // Oops, didn't work out, don't bother trying again. if (PasvAddr == 0) TryPassive = false; } // Passive mode? if (PasvAddr != 0) { // Get a socket if ((DataFd = socket(PasvAddr->ai_family,PasvAddr->ai_socktype, PasvAddr->ai_protocol)) < 0) return _error->Errno("socket",_("Could not create a socket")); // Connect to the server SetNonBlock(DataFd,true); if (connect(DataFd,PasvAddr->ai_addr,PasvAddr->ai_addrlen) < 0 && errno != EINPROGRESS) return _error->Errno("socket",_("Could not create a socket")); /* This implements a timeout for connect by opening the connection nonblocking */ if (WaitFd(DataFd,true,TimeOut) == false) return _error->Error(_("Could not connect data socket, connection timed out")); unsigned int Err; unsigned int Len = sizeof(Err); if (getsockopt(DataFd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0) return _error->Errno("getsockopt",_("Failed")); if (Err != 0) return _error->Error(_("Could not connect passive socket.")); return true; } // Port mode :< close(DataListenFd); DataListenFd = -1; // Get the information for a listening socket. struct addrinfo *BindAddr = NULL; struct addrinfo Hints; memset(&Hints,0,sizeof(Hints)); Hints.ai_socktype = SOCK_STREAM; Hints.ai_flags |= AI_PASSIVE; Hints.ai_family = ((struct sockaddr *)&ServerAddr)->sa_family; if (getaddrinfo(0,"0",&Hints,&BindAddr) != 0 || BindAddr == NULL) return _error->Error(_("getaddrinfo was unable to get a listening socket")); // Construct the socket if ((DataListenFd = socket(BindAddr->ai_family,BindAddr->ai_socktype, BindAddr->ai_protocol)) < 0) { freeaddrinfo(BindAddr); return _error->Errno("socket",_("Could not create a socket")); } // Bind and listen if (::bind(DataListenFd,BindAddr->ai_addr,BindAddr->ai_addrlen) < 0) { freeaddrinfo(BindAddr); return _error->Errno("bind",_("Could not bind a socket")); } freeaddrinfo(BindAddr); if (listen(DataListenFd,1) < 0) return _error->Errno("listen",_("Could not listen on the socket")); SetNonBlock(DataListenFd,true); // Determine the name to send to the remote struct sockaddr_storage Addr; socklen_t AddrLen = sizeof(Addr); if (getsockname(DataListenFd,(sockaddr *)&Addr,&AddrLen) < 0) return _error->Errno("getsockname",_("Could not determine the socket's name")); // Reverse the address. We need the server address and the data port. char Name[NI_MAXHOST]; char Service[NI_MAXSERV]; char Service2[NI_MAXSERV]; getnameinfo((struct sockaddr *)&Addr,AddrLen, Name,sizeof(Name),Service,sizeof(Service), NI_NUMERICHOST|NI_NUMERICSERV); getnameinfo((struct sockaddr *)&ServerAddr,ServerAddrLen, Name,sizeof(Name),Service2,sizeof(Service2), NI_NUMERICHOST|NI_NUMERICSERV); // Send off an IPv4 address in the old port format if (((struct sockaddr *)&Addr)->sa_family == AF_INET && ForceExtended == false) { // Convert the dots in the quad into commas for (char *I = Name; *I != 0; I++) if (*I == '.') *I = ','; unsigned long Port = atoi(Service); // Send the port command unsigned int Tag; string Msg; if (WriteMsg(Tag,Msg,"PORT %s,%d,%d", Name, (int)(Port >> 8) & 0xff, (int)(Port & 0xff)) == false) return false; if (Tag >= 400) return _error->Error(_("Unable to send PORT command")); return true; } // Construct an EPRT command unsigned Proto = 0; for (unsigned J = 0; AFMap[J].Family != 0; J++) if (AFMap[J].Family == ((struct sockaddr *)&Addr)->sa_family) Proto = AFMap[J].IETFFamily; if (Proto == 0) return _error->Error(_("Unknown address family %u (AF_*)"), ((struct sockaddr *)&Addr)->sa_family); // Send the EPRT command unsigned int Tag; string Msg; if (WriteMsg(Tag,Msg,"EPRT |%u|%s|%s|",Proto,Name,Service) == false) return false; if (Tag >= 400) return _error->Error(_("EPRT failed, server said: %s"),Msg.c_str()); return true; } /*}}}*/ // FTPConn::Finalize - Complete the Data connection /*{{{*/ // --------------------------------------------------------------------- /* If the connection is in port mode this waits for the other end to hook up to us. */ bool FTPConn::Finalize() { // Passive mode? Do nothing if (PasvAddr != 0) return true; // Close any old socket.. close(DataFd); DataFd = -1; // Wait for someone to connect.. if (WaitFd(DataListenFd,false,TimeOut) == false) return _error->Error(_("Data socket connect timed out")); // Accept the connection struct sockaddr_in Addr; socklen_t Len = sizeof(Addr); DataFd = accept(DataListenFd,(struct sockaddr *)&Addr,&Len); if (DataFd < 0) return _error->Errno("accept",_("Unable to accept connection")); close(DataListenFd); DataListenFd = -1; return true; } /*}}}*/ // FTPConn::Get - Get a file /*{{{*/ // --------------------------------------------------------------------- /* This opens a data connection, sends REST and RETR and then transfers the file over. */ bool FTPConn::Get(const char *Path,FileFd &To,unsigned long long Resume, Hashes &Hash,bool &Missing, unsigned long long MaximumSize, pkgAcqMethod *Owner) { Missing = false; if (CreateDataFd() == false) return false; unsigned int Tag; string Msg; if (Resume != 0) { if (WriteMsg(Tag,Msg,"REST %u",Resume) == false) return false; if (Tag >= 400) Resume = 0; } if (To.Truncate(Resume) == false) return false; if (To.Seek(0) == false) return false; if (Resume != 0) { if (Hash.AddFD(To,Resume) == false) { _error->Errno("read",_("Problem hashing file")); return false; } } // Send the get command if (WriteMsg(Tag,Msg,"RETR %s",Path) == false) return false; if (Tag >= 400) { if (Tag == 550) Missing = true; return _error->Error(_("Unable to fetch file, server said '%s'"),Msg.c_str()); } // Finish off the data connection if (Finalize() == false) return false; // Copy loop unsigned char Buffer[4096]; while (1) { // Wait for some data.. if (WaitFd(DataFd,false,TimeOut) == false) { Close(); return _error->Error(_("Data socket timed out")); } // Read the data.. int Res = read(DataFd,Buffer,sizeof(Buffer)); if (Res == 0) break; if (Res < 0) { if (errno == EAGAIN) continue; break; } Hash.Add(Buffer,Res); if (To.Write(Buffer,Res) == false) { Close(); return false; } if (MaximumSize > 0 && To.Tell() > MaximumSize) { Owner->SetFailReason("MaximumSizeExceeded"); return _error->Error(_("File has unexpected size (%llu != %llu). Mirror sync in progress?"), To.Tell(), MaximumSize); } } // All done close(DataFd); DataFd = -1; // Read the closing message from the server if (ReadResp(Tag,Msg) == false) return false; if (Tag >= 400) return _error->Error(_("Data transfer failed, server said '%s'"),Msg.c_str()); return true; } /*}}}*/ // FtpMethod::FtpMethod - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ FtpMethod::FtpMethod() : aptAuthConfMethod("ftp", "1.0", SendConfig) { SeccompFlags = aptMethod::BASE | aptMethod::NETWORK; signal(SIGTERM,SigTerm); signal(SIGINT,SigTerm); Server = 0; FailFd = -1; } /*}}}*/ // FtpMethod::SigTerm - Handle a fatal signal /*{{{*/ // --------------------------------------------------------------------- /* This closes and timestamps the open file. This is necessary to get resume behavior on user abort */ void FtpMethod::SigTerm(int) { if (FailFd == -1) _exit(100); // Timestamp struct timeval times[2]; times[0].tv_sec = FailTime; times[1].tv_sec = FailTime; times[0].tv_usec = times[1].tv_usec = 0; utimes(FailFile.c_str(), times); close(FailFd); _exit(100); } /*}}}*/ // FtpMethod::Configuration - Handle a configuration message /*{{{*/ // --------------------------------------------------------------------- /* We stash the desired pipeline depth */ bool FtpMethod::Configuration(string Message) { if (aptAuthConfMethod::Configuration(Message) == false) return false; TimeOut = _config->FindI("Acquire::Ftp::Timeout",TimeOut); return true; } /*}}}*/ // FtpMethod::Fetch - Fetch a file /*{{{*/ // --------------------------------------------------------------------- /* Fetch a single file, called by the base class.. */ bool FtpMethod::Fetch(FetchItem *Itm) { URI Get = Itm->Uri; const char *File = Get.Path.c_str(); FetchResult Res; Res.Filename = Itm->DestFile; Res.IMSHit = false; MaybeAddAuthTo(Get); // Connect to the server if (Server == 0 || Server->Comp(Get) == false) { delete Server; Server = new FTPConn(Get); } // Could not connect is a transient error.. switch (Server->Open(this)) { case ResultState::TRANSIENT_ERROR: Server->Close(); Fail(true); return true; case ResultState::FATAL_ERROR: Server->Close(); Fail(false); return true; case ResultState::SUCCESSFUL: break; } // Get the files information Status(_("Query")); unsigned long long Size; if (Server->Size(File,Size) == false || Server->ModTime(File,FailTime) == false) { Fail(true); return true; } Res.Size = Size; // See if it is an IMS hit if (Itm->LastModified == FailTime) { Res.Size = 0; Res.IMSHit = true; URIDone(Res); return true; } // See if the file exists struct stat Buf; if (stat(Itm->DestFile.c_str(),&Buf) == 0) { if (Size == (unsigned long long)Buf.st_size && FailTime == Buf.st_mtime) { Res.Size = Buf.st_size; Res.LastModified = Buf.st_mtime; Res.ResumePoint = Buf.st_size; URIDone(Res); return true; } // Resume? if (FailTime == Buf.st_mtime && Size > (unsigned long long)Buf.st_size) Res.ResumePoint = Buf.st_size; } // Open the file Hashes Hash(Itm->ExpectedHashes); { FileFd Fd(Itm->DestFile,FileFd::WriteAny); if (_error->PendingError() == true) return false; URIStart(Res); FailFile = Itm->DestFile; FailFile.c_str(); // Make sure we don't do a malloc in the signal handler FailFd = Fd.Fd(); bool Missing; if (Server->Get(File,Fd,Res.ResumePoint,Hash,Missing,Itm->MaximumSize,this) == false) { Fd.Close(); // Timestamp struct timeval times[2]; times[0].tv_sec = FailTime; times[1].tv_sec = FailTime; times[0].tv_usec = times[1].tv_usec = 0; utimes(FailFile.c_str(), times); // If the file is missing we hard fail and delete the destfile // otherwise transient fail if (Missing == true) { RemoveFile("ftp", FailFile); return false; } Fail(true); return true; } Res.Size = Fd.Size(); // Timestamp struct timeval times[2]; times[0].tv_sec = FailTime; times[1].tv_sec = FailTime; times[0].tv_usec = times[1].tv_usec = 0; utimes(Fd.Name().c_str(), times); FailFd = -1; } Res.LastModified = FailTime; Res.TakeHashes(Hash); URIDone(Res); return true; } /*}}}*/ int main(int, const char *argv[]) { /* See if we should be come the http client - we do this for http proxy urls */ if (getenv("ftp_proxy") != 0) { URI Proxy = string(getenv("ftp_proxy")); // Run the HTTP method if (Proxy.Access == "http") { // Copy over the environment setting char S[300]; snprintf(S,sizeof(S),"http_proxy=%s",getenv("ftp_proxy")); putenv(S); putenv((char *)"no_proxy="); // Run the http method string Path = flNotFile(argv[0]) + "http"; execl(Path.c_str(),Path.c_str(),(char *)NULL); cerr << _("Unable to invoke ") << Path << endl; exit(100); } } return FtpMethod().Run(); }