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Diffstat (limited to 'methods/ftp.cc')
| -rw-r--r-- | methods/ftp.cc | 1188 |
1 files changed, 1188 insertions, 0 deletions
diff --git a/methods/ftp.cc b/methods/ftp.cc new file mode 100644 index 0000000..1623623 --- /dev/null +++ b/methods/ftp.cc @@ -0,0 +1,1188 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/* ###################################################################### + + 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 <config.h> + +#include <apt-pkg/configuration.h> +#include <apt-pkg/error.h> +#include <apt-pkg/fileutl.h> +#include <apt-pkg/hashes.h> +#include <apt-pkg/strutl.h> + +#include <iostream> +#include <ctype.h> +#include <errno.h> +#include <signal.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/time.h> +#include <unistd.h> + +// Internet stuff +#include <netdb.h> +#include <arpa/inet.h> +#include <netinet/in.h> + +#include "connect.h" +#include "ftp.h" +#include "rfc2553emu.h" + +#include <apti18n.h> + /*}}}*/ + +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 | SendURIEncoded) +{ + 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); + auto const File = DecodeSendURI(Get.Path); + 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 (not Server->Size(File.c_str(), Size) || + not Server->ModTime(File.c_str(), FailTime)) + { + 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 (not Server->Get(File.c_str(), Fd, Res.ResumePoint, Hash, Missing, Itm->MaximumSize, this)) + { + 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(); +} |