// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: ftp.cc,v 1.7 1999/04/17 23:18:11 jgg Exp $ /* ###################################################################### HTTP Aquire Method - This is the FTP aquire method for APT. This is a very simple implementation that does not try to optimize at all. Commands are sent syncronously with the FTP server (as the rfc recommends, but it is not really necessary..) and no tricks are done to speed things along. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <apt-pkg/fileutl.h> #include <apt-pkg/acquire-method.h> #include <apt-pkg/error.h> #include <apt-pkg/md5.h> #include <sys/stat.h> #include <sys/time.h> #include <utime.h> #include <unistd.h> #include <signal.h> #include <stdio.h> #include <errno.h> #include <stdarg.h> // Internet stuff #include <netinet/in.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netdb.h> #include "ftp.h" /*}}}*/ unsigned long TimeOut = 120; URI Proxy; string FtpMethod::FailFile; int FtpMethod::FailFd = -1; time_t FtpMethod::FailTime = 0; // FTPConn::FTPConn - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ FTPConn::FTPConn(URI Srv) : Len(0), ServerFd(-1), DataFd(-1), DataListenFd(-1), ServerName(Srv) { Debug = _config->FindB("Debug::Acquire::Ftp",false); memset(&PasvAddr,0,sizeof(PasvAddr)); } /*}}}*/ // FTPConn::~FTPConn - Destructor /*{{{*/ // --------------------------------------------------------------------- /* */ FTPConn::~FTPConn() { Close(); } /*}}}*/ // FTPConn::Close - Close down the connection /*{{{*/ // --------------------------------------------------------------------- /* Just tear down the socket and data socket */ void FTPConn::Close() { close(ServerFd); ServerFd = -1; close(DataFd); DataFd = -1; close(DataListenFd); DataListenFd = -1; memset(&PasvAddr,0,sizeof(PasvAddr)); } /*}}}*/ // FTPConn::Open - Open a new connection /*{{{*/ // --------------------------------------------------------------------- /* Connect to the server using a non-blocking connection and perform a login. */ string LastHost; in_addr LastHostA; bool FTPConn::Open(pkgAcqMethod *Owner) { // Use the already open connection if possible. if (ServerFd != -1) return true; Close(); // Determine the proxy setting if (getenv("ftp_proxy") == 0) { string DefProxy = _config->Find("Acquire::ftp::Proxy"); string SpecificProxy = _config->Find("Acquire::ftp::Proxy::" + ServerName.Host); if (SpecificProxy.empty() == false) { if (SpecificProxy == "DIRECT") Proxy = ""; else Proxy = SpecificProxy; } else Proxy = DefProxy; } else Proxy = getenv("ftp_proxy"); // Determine what host and port to use based on the proxy settings int Port = 21; 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; } /* We used a cached address record.. Yes this is against the spec but the way we have setup our rotating dns suggests that this is more sensible */ if (LastHost != Host) { Owner->Status("Connecting to %s",Host.c_str()); // Lookup the host hostent *Addr = gethostbyname(Host.c_str()); if (Addr == 0 || Addr->h_addr_list[0] == 0) return _error->Error("Could not resolve '%s'",Host.c_str()); LastHost = Host; LastHostA = *(in_addr *)(Addr->h_addr_list[0]); } Owner->Status("Connecting to %s (%s)",Host.c_str(),inet_ntoa(LastHostA)); // Get a socket if ((ServerFd = socket(AF_INET,SOCK_STREAM,0)) < 0) return _error->Errno("socket","Could not create a socket"); // Connect to the server struct sockaddr_in server; server.sin_family = AF_INET; server.sin_port = htons(Port); server.sin_addr = LastHostA; SetNonBlock(ServerFd,true); if (connect(ServerFd,(sockaddr *)&server,sizeof(server)) < 0 && errno != EINPROGRESS) return _error->Errno("socket","Could not create a socket"); Peer = server; /* This implements a timeout for connect by opening the connection nonblocking */ if (WaitFd(ServerFd,true,TimeOut) == false) return _error->Error("Could not connect, connection timed out"); unsigned int Err; unsigned int Len = sizeof(Err); if (getsockopt(ServerFd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0) return _error->Errno("getsockopt","Failed"); if (Err != 0) return _error->Error("Could not connect."); Owner->Status("Logging in"); return Login(); } /*}}}*/ // FTPConn::Login - Login to the remote server /*{{{*/ // --------------------------------------------------------------------- /* This performs both normal login and proxy login using a simples script stored in the config file. */ bool FTPConn::Login() { unsigned int Tag; string Msg; // Setup the variables needed for authentication string User = "anonymous"; string Pass = "apt_get_ftp_2.0@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 false; if (Tag >= 400) return _error->Error("Server refused our connection and said: %s",Msg.c_str()); // Send the user if (WriteMsg(Tag,Msg,"USER %s",User.c_str()) == false) return false; if (Tag >= 400) return _error->Error("USER failed, server said: %s",Msg.c_str()); // Send the Password if (WriteMsg(Tag,Msg,"PASS %s",Pass.c_str()) == false) return false; if (Tag >= 400) return _error->Error("PASS failed, server said: %s",Msg.c_str()); // 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 false; if (Tag >= 400) return _error->Error("Server refused our connection and said: %s",Msg.c_str()); // Perform proxy script execution Configuration::Item const *Opts = _config->Tree("Acquire::ftp::ProxyLogin"); if (Opts == 0 || Opts->Child == 0) return _error->Error("A proxy server was specified but no login " "script, Acquire::ftp::ProxyLogin is empty."); 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 char SitePort[20]; if (ServerName.Port != 0) sprintf(SitePort,"%u",ServerName.Port); else strcpy(SitePort,"21"); 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); Tmp = SubstVar(Tmp,"$(SITE_PORT)",SitePort); Tmp = SubstVar(Tmp,"$(SITE)",ServerName.Host); // Send the command if (WriteMsg(Tag,Msg,"%s",Tmp.c_str()) == false) return false; if (Tag >= 400) return _error->Error("Login script command '%s' failed, server said: %s",Tmp.c_str(),Msg.c_str()); } // 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); } } // Binary mode if (WriteMsg(Tag,Msg,"TYPE I") == false) return false; if (Tag >= 400) return _error->Error("TYPE failed, server said: %s",Msg.c_str()); return true; } /*}}}*/ // FTPConn::ReadLine - Read a line from the server /*{{{*/ // --------------------------------------------------------------------- /* This performs a very simple buffered read. */ bool FTPConn::ReadLine(string &Text) { if (ServerFd == -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,false,TimeOut) == false) { Close(); return _error->Error("Connection timeout"); } // Suck it back int Res = read(ServerFd,Buffer + Len,sizeof(Buffer) - Len); if (Res <= 0) { Close(); return _error->Errno("read","Read error"); } 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"); 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,true,TimeOut) == false) { Close(); return _error->Error("Connection timeout"); } int Res = write(ServerFd,S + Start,Len); if (Res <= 0) { Close(); return _error->Errno("write","Write Error"); } 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. Borrowed mostly from lftp. We have to enter passive mode every time we make a data connection :| */ bool FTPConn::GoPasv() { // 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 || Pos == string::npos) { memset(&PasvAddr,0,sizeof(PasvAddr)); 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) { memset(&PasvAddr,0,sizeof(PasvAddr)); return true; } // lftp used this horrid byte order manipulation.. Ik. PasvAddr.sin_family = AF_INET; unsigned char *a; unsigned char *p; a = (unsigned char *)&PasvAddr.sin_addr; p = (unsigned char *)&PasvAddr.sin_port; // Some evil servers return 0 to mean their addr if (a0 == 0 && a1 == 0 && a2 == 0 && a3 == 0) { PasvAddr.sin_addr = Peer.sin_addr; } else { a[0] = a0; a[1] = a1; a[2] = a2; a[3] = a3; } p[0] = p0; p[1] = p1; 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 &Size) { // Query the size unsigned int Tag; string Msg; Size = 0; if (WriteMsg(Tag,Msg,"SIZE %s",Path) == false) return false; char *End; Size = strtol(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 struct tm tm; memset(&tm,0,sizeof(tm)); if (sscanf(Msg.c_str(),"%4d%2d%2d%2d%2d%2d",&tm.tm_year,&tm.tm_mon, &tm.tm_mday,&tm.tm_hour,&tm.tm_min,&tm.tm_sec) != 6) return true; tm.tm_year -= 1900; tm.tm_mon--; /* We use timegm from the GNU C library, libapt-pkg will provide this symbol if it does not exist */ Time = timegm(&tm); return true; } /*}}}*/ // 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.sin_port == 0) TryPassive = false; } // Passive mode? if (PasvAddr.sin_port != 0) { // Get a socket if ((DataFd = socket(AF_INET,SOCK_STREAM,0)) < 0) return _error->Errno("socket","Could not create a socket"); // Connect to the server SetNonBlock(DataFd,true); if (connect(DataFd,(sockaddr *)&PasvAddr,sizeof(PasvAddr)) < 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(ServerFd,true,TimeOut) == false) return _error->Error("Could not connect data socket, connection timed out"); unsigned int Err; unsigned int Len = sizeof(Err); if (getsockopt(ServerFd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0) return _error->Errno("getsockopt","Failed"); if (Err != 0) return _error->Error("Could not connect."); return true; } // Port mode :< close(DataListenFd); DataListenFd = -1; // Get a socket if ((DataListenFd = socket(AF_INET,SOCK_STREAM,0)) < 0) return _error->Errno("socket","Could not create a socket"); // Bind and listen sockaddr_in Addr; memset(&Addr,0,sizeof(Addr)); if (bind(DataListenFd,(sockaddr *)&Addr,sizeof(Addr)) < 0) return _error->Errno("bind","Could not bind a socket"); 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 sockaddr_in Addr2; socklen_t Jnk = sizeof(Addr); if (getsockname(DataListenFd,(sockaddr *)&Addr,&Jnk) < 0) return _error->Errno("getsockname","Could not determine the socket's name"); Jnk = sizeof(Addr2); if (getsockname(ServerFd,(sockaddr *)&Addr2,&Jnk) < 0) return _error->Errno("getsockname","Could not determine the socket's name"); // This bit ripped from qftp unsigned long badr = ntohl(*(unsigned long *)&Addr2.sin_addr); unsigned long bp = ntohs(Addr.sin_port); // Send the port command unsigned int Tag; string Msg; if (WriteMsg(Tag,Msg,"PORT %d,%d,%d,%d,%d,%d", (int) (badr >> 24) & 0xff, (int) (badr >> 16) & 0xff, (int) (badr >> 8) & 0xff, (int) badr & 0xff, (int) (bp >> 8) & 0xff, (int) bp & 0xff) == false) return false; if (Tag >= 400) return _error->Error("Unable to send port command"); 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.sin_port != 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 Resume, MD5Summation &MD5,bool &Missing) { 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 (MD5.AddFD(To.Fd(),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; } MD5.Add(Buffer,Res); if (To.Write(Buffer,Res) == false) { Close(); return false; } } // 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() : pkgAcqMethod("1.0",SendConfig) { 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 neccessary to get resume behavoir on user abort */ void FtpMethod::SigTerm(int) { if (FailFd == -1) exit(100); close(FailFd); // Timestamp struct utimbuf UBuf; UBuf.actime = FailTime; UBuf.modtime = FailTime; utime(FailFile.c_str(),&UBuf); exit(100); } /*}}}*/ // FtpMethod::Configuration - Handle a configuration message /*{{{*/ // --------------------------------------------------------------------- /* We stash the desired pipeline depth */ bool FtpMethod::Configuration(string Message) { if (pkgAcqMethod::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; // Connect to the server if (Server == 0 || Server->Comp(Get) == false) { delete Server; Server = new FTPConn(Get); } // Could not connect is a transient error.. if (Server->Open(this) == false) { Fail(true); return true; } // Get the files information Status("Query"); unsigned 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)Buf.st_size && FailTime == Buf.st_mtime) { Res.Size = Buf.st_size; Res.LastModified = Buf.st_mtime; URIDone(Res); return true; } // Resume? if (FailTime == Buf.st_mtime && Size > (unsigned)Buf.st_size) Res.ResumePoint = Buf.st_size; } // Open the file MD5Summation MD5; { FileFd Fd(Itm->DestFile,FileFd::WriteAny); if (_error->PendingError() == true) return false; URIStart(Res); FailFile = Itm->DestFile; FailFile.c_str(); // Make sure we dont do a malloc in the signal handler FailFd = Fd.Fd(); bool Missing; if (Server->Get(File,Fd,Res.ResumePoint,MD5,Missing) == false) { // If the file is missing we hard fail otherwise transient fail if (Missing == true) return false; Fail(true); return true; } Res.Size = Fd.Size(); } Res.LastModified = FailTime; Res.MD5Sum = MD5.Result(); // Timestamp struct utimbuf UBuf; time(&UBuf.actime); UBuf.actime = FailTime; UBuf.modtime = FailTime; utime(Queue->DestFile.c_str(),&UBuf); FailFd = -1; URIDone(Res); return true; } /*}}}*/ int main() { FtpMethod Mth; return Mth.Run(); }