// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: http.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $ /* ###################################################################### HTTP Acquire Method - This is the HTTP aquire method for APT. It uses HTTP/1.1 and many of the fancy options there-in, such as pipelining, range, if-range and so on. It is based on a doubly buffered select loop. A groupe of requests are fed into a single output buffer that is constantly fed out the socket. This provides ideal pipelining as in many cases all of the requests will fit into a single packet. The input socket is buffered the same way and fed into the fd for the file (may be a pipe in future). This double buffering provides fairly substantial transfer rates, compared to wget the http method is about 4% faster. Most importantly, when HTTP is compared with FTP as a protocol the speed difference is huge. In tests over the internet from two sites to llug (via ATM) this program got 230k/s sustained http transfer rates. FTP on the other hand topped out at 170k/s. That combined with the time to setup the FTP connection makes HTTP a vastly superior protocol. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <apt-pkg/fileutl.h> #include <apt-pkg/acquire-method.h> #include <apt-pkg/error.h> #include <apt-pkg/hashes.h> #include <apt-pkg/netrc.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 <string.h> #include <iostream> #include <map> #include <apti18n.h> // Internet stuff #include <netdb.h> #include "config.h" #include "connect.h" #include "rfc2553emu.h" #include "http.h" /*}}}*/ using namespace std; string HttpMethod::FailFile; int HttpMethod::FailFd = -1; time_t HttpMethod::FailTime = 0; unsigned long PipelineDepth = 10; unsigned long TimeOut = 120; bool AllowRedirect = false; bool Debug = false; URI Proxy; unsigned long CircleBuf::BwReadLimit=0; unsigned long CircleBuf::BwTickReadData=0; struct timeval CircleBuf::BwReadTick={0,0}; const unsigned int CircleBuf::BW_HZ=10; // CircleBuf::CircleBuf - Circular input buffer /*{{{*/ // --------------------------------------------------------------------- /* */ CircleBuf::CircleBuf(unsigned long Size) : Size(Size), Hash(0) { Buf = new unsigned char[Size]; Reset(); CircleBuf::BwReadLimit = _config->FindI("Acquire::http::Dl-Limit",0)*1024; } /*}}}*/ // CircleBuf::Reset - Reset to the default state /*{{{*/ // --------------------------------------------------------------------- /* */ void CircleBuf::Reset() { InP = 0; OutP = 0; StrPos = 0; MaxGet = (unsigned int)-1; OutQueue = string(); if (Hash != 0) { delete Hash; Hash = new Hashes; } }; /*}}}*/ // CircleBuf::Read - Read from a FD into the circular buffer /*{{{*/ // --------------------------------------------------------------------- /* This fills up the buffer with as much data as is in the FD, assuming it is non-blocking.. */ bool CircleBuf::Read(int Fd) { unsigned long BwReadMax; while (1) { // Woops, buffer is full if (InP - OutP == Size) return true; // what's left to read in this tick BwReadMax = CircleBuf::BwReadLimit/BW_HZ; if(CircleBuf::BwReadLimit) { struct timeval now; gettimeofday(&now,0); unsigned long d = (now.tv_sec-CircleBuf::BwReadTick.tv_sec)*1000000 + now.tv_usec-CircleBuf::BwReadTick.tv_usec; if(d > 1000000/BW_HZ) { CircleBuf::BwReadTick = now; CircleBuf::BwTickReadData = 0; } if(CircleBuf::BwTickReadData >= BwReadMax) { usleep(1000000/BW_HZ); return true; } } // Write the buffer segment int Res; if(CircleBuf::BwReadLimit) { Res = read(Fd,Buf + (InP%Size), BwReadMax > LeftRead() ? LeftRead() : BwReadMax); } else Res = read(Fd,Buf + (InP%Size),LeftRead()); if(Res > 0 && BwReadLimit > 0) CircleBuf::BwTickReadData += Res; if (Res == 0) return false; if (Res < 0) { if (errno == EAGAIN) return true; return false; } if (InP == 0) gettimeofday(&Start,0); InP += Res; } } /*}}}*/ // CircleBuf::Read - Put the string into the buffer /*{{{*/ // --------------------------------------------------------------------- /* This will hold the string in and fill the buffer with it as it empties */ bool CircleBuf::Read(string Data) { OutQueue += Data; FillOut(); return true; } /*}}}*/ // CircleBuf::FillOut - Fill the buffer from the output queue /*{{{*/ // --------------------------------------------------------------------- /* */ void CircleBuf::FillOut() { if (OutQueue.empty() == true) return; while (1) { // Woops, buffer is full if (InP - OutP == Size) return; // Write the buffer segment unsigned long Sz = LeftRead(); if (OutQueue.length() - StrPos < Sz) Sz = OutQueue.length() - StrPos; memcpy(Buf + (InP%Size),OutQueue.c_str() + StrPos,Sz); // Advance StrPos += Sz; InP += Sz; if (OutQueue.length() == StrPos) { StrPos = 0; OutQueue = ""; return; } } } /*}}}*/ // CircleBuf::Write - Write from the buffer into a FD /*{{{*/ // --------------------------------------------------------------------- /* This empties the buffer into the FD. */ bool CircleBuf::Write(int Fd) { while (1) { FillOut(); // Woops, buffer is empty if (OutP == InP) return true; if (OutP == MaxGet) return true; // Write the buffer segment int Res; Res = write(Fd,Buf + (OutP%Size),LeftWrite()); if (Res == 0) return false; if (Res < 0) { if (errno == EAGAIN) return true; return false; } if (Hash != 0) Hash->Add(Buf + (OutP%Size),Res); OutP += Res; } } /*}}}*/ // CircleBuf::WriteTillEl - Write from the buffer to a string /*{{{*/ // --------------------------------------------------------------------- /* This copies till the first empty line */ bool CircleBuf::WriteTillEl(string &Data,bool Single) { // We cheat and assume it is unneeded to have more than one buffer load for (unsigned long I = OutP; I < InP; I++) { if (Buf[I%Size] != '\n') continue; ++I; if (Single == false) { if (I < InP && Buf[I%Size] == '\r') ++I; if (I >= InP || Buf[I%Size] != '\n') continue; ++I; } Data = ""; while (OutP < I) { unsigned long Sz = LeftWrite(); if (Sz == 0) return false; if (I - OutP < Sz) Sz = I - OutP; Data += string((char *)(Buf + (OutP%Size)),Sz); OutP += Sz; } return true; } return false; } /*}}}*/ // CircleBuf::Stats - Print out stats information /*{{{*/ // --------------------------------------------------------------------- /* */ void CircleBuf::Stats() { if (InP == 0) return; struct timeval Stop; gettimeofday(&Stop,0); /* float Diff = Stop.tv_sec - Start.tv_sec + (float)(Stop.tv_usec - Start.tv_usec)/1000000; clog << "Got " << InP << " in " << Diff << " at " << InP/Diff << endl;*/ } /*}}}*/ // ServerState::ServerState - Constructor /*{{{*/ // --------------------------------------------------------------------- /* */ ServerState::ServerState(URI Srv,HttpMethod *Owner) : Owner(Owner), In(64*1024), Out(4*1024), ServerName(Srv) { Reset(); } /*}}}*/ // ServerState::Open - Open a connection to the server /*{{{*/ // --------------------------------------------------------------------- /* This opens a connection to the server. */ bool ServerState::Open() { // Use the already open connection if possible. if (ServerFd != -1) return true; Close(); In.Reset(); Out.Reset(); Persistent = true; // Determine the proxy setting string SpecificProxy = _config->Find("Acquire::http::Proxy::" + ServerName.Host); if (!SpecificProxy.empty()) { if (SpecificProxy == "DIRECT") Proxy = ""; else Proxy = SpecificProxy; } else { string DefProxy = _config->Find("Acquire::http::Proxy"); if (!DefProxy.empty()) { Proxy = DefProxy; } else { char* result = getenv("http_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 || Proxy.Host.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 if (Connect(Host,Port,"http",80,ServerFd,TimeOut,Owner) == false) return false; return true; } /*}}}*/ // ServerState::Close - Close a connection to the server /*{{{*/ // --------------------------------------------------------------------- /* */ bool ServerState::Close() { close(ServerFd); ServerFd = -1; return true; } /*}}}*/ // ServerState::RunHeaders - Get the headers before the data /*{{{*/ // --------------------------------------------------------------------- /* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header parse error occurred */ int ServerState::RunHeaders() { State = Header; Owner->Status(_("Waiting for headers")); Major = 0; Minor = 0; Result = 0; Size = 0; StartPos = 0; Encoding = Closes; HaveContent = false; time(&Date); do { string Data; if (In.WriteTillEl(Data) == false) continue; if (Debug == true) clog << Data; for (string::const_iterator I = Data.begin(); I < Data.end(); I++) { string::const_iterator J = I; for (; J != Data.end() && *J != '\n' && *J != '\r';J++); if (HeaderLine(string(I,J)) == false) return 2; I = J; } // 100 Continue is a Nop... if (Result == 100) continue; // Tidy up the connection persistance state. if (Encoding == Closes && HaveContent == true) Persistent = false; return 0; } while (Owner->Go(false,this) == true); return 1; } /*}}}*/ // ServerState::RunData - Transfer the data from the socket /*{{{*/ // --------------------------------------------------------------------- /* */ bool ServerState::RunData() { State = Data; // Chunked transfer encoding is fun.. if (Encoding == Chunked) { while (1) { // Grab the block size bool Last = true; string Data; In.Limit(-1); do { if (In.WriteTillEl(Data,true) == true) break; } while ((Last = Owner->Go(false,this)) == true); if (Last == false) return false; // See if we are done unsigned long Len = strtol(Data.c_str(),0,16); if (Len == 0) { In.Limit(-1); // We have to remove the entity trailer Last = true; do { if (In.WriteTillEl(Data,true) == true && Data.length() <= 2) break; } while ((Last = Owner->Go(false,this)) == true); if (Last == false) return false; return !_error->PendingError(); } // Transfer the block In.Limit(Len); while (Owner->Go(true,this) == true) if (In.IsLimit() == true) break; // Error if (In.IsLimit() == false) return false; // The server sends an extra new line before the next block specifier.. In.Limit(-1); Last = true; do { if (In.WriteTillEl(Data,true) == true) break; } while ((Last = Owner->Go(false,this)) == true); if (Last == false) return false; } } else { /* Closes encoding is used when the server did not specify a size, the loss of the connection means we are done */ if (Encoding == Closes) In.Limit(-1); else In.Limit(Size - StartPos); // Just transfer the whole block. do { if (In.IsLimit() == false) continue; In.Limit(-1); return !_error->PendingError(); } while (Owner->Go(true,this) == true); } return Owner->Flush(this) && !_error->PendingError(); } /*}}}*/ // ServerState::HeaderLine - Process a header line /*{{{*/ // --------------------------------------------------------------------- /* */ bool ServerState::HeaderLine(string Line) { if (Line.empty() == true) return true; // The http server might be trying to do something evil. if (Line.length() >= MAXLEN) return _error->Error(_("Got a single header line over %u chars"),MAXLEN); string::size_type Pos = Line.find(' '); if (Pos == string::npos || Pos+1 > Line.length()) { // Blah, some servers use "connection:closes", evil. Pos = Line.find(':'); if (Pos == string::npos || Pos + 2 > Line.length()) return _error->Error(_("Bad header line")); Pos++; } // Parse off any trailing spaces between the : and the next word. string::size_type Pos2 = Pos; while (Pos2 < Line.length() && isspace(Line[Pos2]) != 0) Pos2++; string Tag = string(Line,0,Pos); string Val = string(Line,Pos2); if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0) { // Evil servers return no version if (Line[4] == '/') { if (sscanf(Line.c_str(),"HTTP/%u.%u %u%[^\n]",&Major,&Minor, &Result,Code) != 4) return _error->Error(_("The HTTP server sent an invalid reply header")); } else { Major = 0; Minor = 9; if (sscanf(Line.c_str(),"HTTP %u%[^\n]",&Result,Code) != 2) return _error->Error(_("The HTTP server sent an invalid reply header")); } /* Check the HTTP response header to get the default persistance state. */ if (Major < 1) Persistent = false; else { if (Major == 1 && Minor <= 0) Persistent = false; else Persistent = true; } return true; } if (stringcasecmp(Tag,"Content-Length:") == 0) { if (Encoding == Closes) Encoding = Stream; HaveContent = true; // The length is already set from the Content-Range header if (StartPos != 0) return true; if (sscanf(Val.c_str(),"%lu",&Size) != 1) return _error->Error(_("The HTTP server sent an invalid Content-Length header")); return true; } if (stringcasecmp(Tag,"Content-Type:") == 0) { HaveContent = true; return true; } if (stringcasecmp(Tag,"Content-Range:") == 0) { HaveContent = true; if (sscanf(Val.c_str(),"bytes %lu-%*u/%lu",&StartPos,&Size) != 2) return _error->Error(_("The HTTP server sent an invalid Content-Range header")); if ((unsigned)StartPos > Size) return _error->Error(_("This HTTP server has broken range support")); return true; } if (stringcasecmp(Tag,"Transfer-Encoding:") == 0) { HaveContent = true; if (stringcasecmp(Val,"chunked") == 0) Encoding = Chunked; return true; } if (stringcasecmp(Tag,"Connection:") == 0) { if (stringcasecmp(Val,"close") == 0) Persistent = false; if (stringcasecmp(Val,"keep-alive") == 0) Persistent = true; return true; } if (stringcasecmp(Tag,"Last-Modified:") == 0) { if (StrToTime(Val,Date) == false) return _error->Error(_("Unknown date format")); return true; } if (stringcasecmp(Tag,"Location:") == 0) { Location = Val; return true; } return true; } /*}}}*/ // HttpMethod::SendReq - Send the HTTP request /*{{{*/ // --------------------------------------------------------------------- /* This places the http request in the outbound buffer */ void HttpMethod::SendReq(FetchItem *Itm,CircleBuf &Out) { URI Uri = Itm->Uri; // The HTTP server expects a hostname with a trailing :port char Buf[1000]; string ProperHost = Uri.Host; if (Uri.Port != 0) { sprintf(Buf,":%u",Uri.Port); ProperHost += Buf; } // Just in case. if (Itm->Uri.length() >= sizeof(Buf)) abort(); /* Build the request. We include a keep-alive header only for non-proxy requests. This is to tweak old http/1.0 servers that do support keep-alive but not HTTP/1.1 automatic keep-alive. Doing this with a proxy server will glitch HTTP/1.0 proxies because they do not filter it out and pass it on, HTTP/1.1 says the connection should default to keep alive and we expect the proxy to do this */ if (Proxy.empty() == true || Proxy.Host.empty()) sprintf(Buf,"GET %s HTTP/1.1\r\nHost: %s\r\nConnection: keep-alive\r\n", QuoteString(Uri.Path,"~").c_str(),ProperHost.c_str()); else { /* Generate a cache control header if necessary. We place a max cache age on index files, optionally set a no-cache directive and a no-store directive for archives. */ sprintf(Buf,"GET %s HTTP/1.1\r\nHost: %s\r\n", Itm->Uri.c_str(),ProperHost.c_str()); // only generate a cache control header if we actually want to // use a cache if (_config->FindB("Acquire::http::No-Cache",false) == false) { if (Itm->IndexFile == true) sprintf(Buf+strlen(Buf),"Cache-Control: max-age=%u\r\n", _config->FindI("Acquire::http::Max-Age",0)); else { if (_config->FindB("Acquire::http::No-Store",false) == true) strcat(Buf,"Cache-Control: no-store\r\n"); } } } // generate a no-cache header if needed if (_config->FindB("Acquire::http::No-Cache",false) == true) strcat(Buf,"Cache-Control: no-cache\r\nPragma: no-cache\r\n"); string Req = Buf; // Check for a partial file struct stat SBuf; if (stat(Itm->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0) { // In this case we send an if-range query with a range header sprintf(Buf,"Range: bytes=%li-\r\nIf-Range: %s\r\n",(long)SBuf.st_size - 1, TimeRFC1123(SBuf.st_mtime).c_str()); Req += Buf; } else { if (Itm->LastModified != 0) { sprintf(Buf,"If-Modified-Since: %s\r\n",TimeRFC1123(Itm->LastModified).c_str()); Req += Buf; } } if (Proxy.User.empty() == false || Proxy.Password.empty() == false) Req += string("Proxy-Authorization: Basic ") + Base64Encode(Proxy.User + ":" + Proxy.Password) + "\r\n"; maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc")); if (Uri.User.empty() == false || Uri.Password.empty() == false) { Req += string("Authorization: Basic ") + Base64Encode(Uri.User + ":" + Uri.Password) + "\r\n"; } Req += "User-Agent: " + _config->Find("Acquire::http::User-Agent", "Debian APT-HTTP/1.3 ("VERSION")") + "\r\n\r\n"; if (Debug == true) cerr << Req << endl; Out.Read(Req); } /*}}}*/ // HttpMethod::Go - Run a single loop /*{{{*/ // --------------------------------------------------------------------- /* This runs the select loop over the server FDs, Output file FDs and stdin. */ bool HttpMethod::Go(bool ToFile,ServerState *Srv) { // Server has closed the connection if (Srv->ServerFd == -1 && (Srv->In.WriteSpace() == false || ToFile == false)) return false; fd_set rfds,wfds; FD_ZERO(&rfds); FD_ZERO(&wfds); /* Add the server. We only send more requests if the connection will be persisting */ if (Srv->Out.WriteSpace() == true && Srv->ServerFd != -1 && Srv->Persistent == true) FD_SET(Srv->ServerFd,&wfds); if (Srv->In.ReadSpace() == true && Srv->ServerFd != -1) FD_SET(Srv->ServerFd,&rfds); // Add the file int FileFD = -1; if (File != 0) FileFD = File->Fd(); if (Srv->In.WriteSpace() == true && ToFile == true && FileFD != -1) FD_SET(FileFD,&wfds); // Add stdin FD_SET(STDIN_FILENO,&rfds); // Figure out the max fd int MaxFd = FileFD; if (MaxFd < Srv->ServerFd) MaxFd = Srv->ServerFd; // Select struct timeval tv; tv.tv_sec = TimeOut; tv.tv_usec = 0; int Res = 0; if ((Res = select(MaxFd+1,&rfds,&wfds,0,&tv)) < 0) { if (errno == EINTR) return true; return _error->Errno("select",_("Select failed")); } if (Res == 0) { _error->Error(_("Connection timed out")); return ServerDie(Srv); } // Handle server IO if (Srv->ServerFd != -1 && FD_ISSET(Srv->ServerFd,&rfds)) { errno = 0; if (Srv->In.Read(Srv->ServerFd) == false) return ServerDie(Srv); } if (Srv->ServerFd != -1 && FD_ISSET(Srv->ServerFd,&wfds)) { errno = 0; if (Srv->Out.Write(Srv->ServerFd) == false) return ServerDie(Srv); } // Send data to the file if (FileFD != -1 && FD_ISSET(FileFD,&wfds)) { if (Srv->In.Write(FileFD) == false) return _error->Errno("write",_("Error writing to output file")); } // Handle commands from APT if (FD_ISSET(STDIN_FILENO,&rfds)) { if (Run(true) != -1) exit(100); } return true; } /*}}}*/ // HttpMethod::Flush - Dump the buffer into the file /*{{{*/ // --------------------------------------------------------------------- /* This takes the current input buffer from the Server FD and writes it into the file */ bool HttpMethod::Flush(ServerState *Srv) { if (File != 0) { // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking // can't be set if (File->Name() != "/dev/null") SetNonBlock(File->Fd(),false); if (Srv->In.WriteSpace() == false) return true; while (Srv->In.WriteSpace() == true) { if (Srv->In.Write(File->Fd()) == false) return _error->Errno("write",_("Error writing to file")); if (Srv->In.IsLimit() == true) return true; } if (Srv->In.IsLimit() == true || Srv->Encoding == ServerState::Closes) return true; } return false; } /*}}}*/ // HttpMethod::ServerDie - The server has closed the connection. /*{{{*/ // --------------------------------------------------------------------- /* */ bool HttpMethod::ServerDie(ServerState *Srv) { unsigned int LErrno = errno; // Dump the buffer to the file if (Srv->State == ServerState::Data) { // on GNU/kFreeBSD, apt dies on /dev/null because non-blocking // can't be set if (File->Name() != "/dev/null") SetNonBlock(File->Fd(),false); while (Srv->In.WriteSpace() == true) { if (Srv->In.Write(File->Fd()) == false) return _error->Errno("write",_("Error writing to the file")); // Done if (Srv->In.IsLimit() == true) return true; } } // See if this is because the server finished the data stream if (Srv->In.IsLimit() == false && Srv->State != ServerState::Header && Srv->Encoding != ServerState::Closes) { Srv->Close(); if (LErrno == 0) return _error->Error(_("Error reading from server. Remote end closed connection")); errno = LErrno; return _error->Errno("read",_("Error reading from server")); } else { Srv->In.Limit(-1); // Nothing left in the buffer if (Srv->In.WriteSpace() == false) return false; // We may have got multiple responses back in one packet.. Srv->Close(); return true; } return false; } /*}}}*/ // HttpMethod::DealWithHeaders - Handle the retrieved header data /*{{{*/ // --------------------------------------------------------------------- /* We look at the header data we got back from the server and decide what to do. Returns 0 - File is open, 1 - IMS hit 3 - Unrecoverable error 4 - Error with error content page 5 - Unrecoverable non-server error (close the connection) 6 - Try again with a new or changed URI */ int HttpMethod::DealWithHeaders(FetchResult &Res,ServerState *Srv) { // Not Modified if (Srv->Result == 304) { unlink(Queue->DestFile.c_str()); Res.IMSHit = true; Res.LastModified = Queue->LastModified; return 1; } /* Redirect * * Note that it is only OK for us to treat all redirection the same * because we *always* use GET, not other HTTP methods. There are * three redirection codes for which it is not appropriate that we * redirect. Pass on those codes so the error handling kicks in. */ if (AllowRedirect && (Srv->Result > 300 && Srv->Result < 400) && (Srv->Result != 300 // Multiple Choices && Srv->Result != 304 // Not Modified && Srv->Result != 306)) // (Not part of HTTP/1.1, reserved) { if (!Srv->Location.empty()) { NextURI = Srv->Location; return 6; } /* else pass through for error message */ } /* We have a reply we dont handle. This should indicate a perm server failure */ if (Srv->Result < 200 || Srv->Result >= 300) { _error->Error("%u %s",Srv->Result,Srv->Code); if (Srv->HaveContent == true) return 4; return 3; } // This is some sort of 2xx 'data follows' reply Res.LastModified = Srv->Date; Res.Size = Srv->Size; // Open the file delete File; File = new FileFd(Queue->DestFile,FileFd::WriteAny); if (_error->PendingError() == true) return 5; FailFile = Queue->DestFile; FailFile.c_str(); // Make sure we dont do a malloc in the signal handler FailFd = File->Fd(); FailTime = Srv->Date; // Set the expected size if (Srv->StartPos >= 0) { Res.ResumePoint = Srv->StartPos; if (ftruncate(File->Fd(),Srv->StartPos) < 0) _error->Errno("ftruncate", _("Failed to truncate file")); } // Set the start point lseek(File->Fd(),0,SEEK_END); delete Srv->In.Hash; Srv->In.Hash = new Hashes; // Fill the Hash if the file is non-empty (resume) if (Srv->StartPos > 0) { lseek(File->Fd(),0,SEEK_SET); if (Srv->In.Hash->AddFD(File->Fd(),Srv->StartPos) == false) { _error->Errno("read",_("Problem hashing file")); return 5; } lseek(File->Fd(),0,SEEK_END); } SetNonBlock(File->Fd(),true); return 0; } /*}}}*/ // HttpMethod::SigTerm - Handle a fatal signal /*{{{*/ // --------------------------------------------------------------------- /* This closes and timestamps the open file. This is neccessary to get resume behavoir on user abort */ void HttpMethod::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); } /*}}}*/ // HttpMethod::Fetch - Fetch an item /*{{{*/ // --------------------------------------------------------------------- /* This adds an item to the pipeline. We keep the pipeline at a fixed depth. */ bool HttpMethod::Fetch(FetchItem *) { if (Server == 0) return true; // Queue the requests int Depth = -1; for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth; I = I->Next, Depth++) { // If pipelining is disabled, we only queue 1 request if (Server->Pipeline == false && Depth >= 0) break; // Make sure we stick with the same server if (Server->Comp(I->Uri) == false) break; if (QueueBack == I) { QueueBack = I->Next; SendReq(I,Server->Out); continue; } } return true; }; /*}}}*/ // HttpMethod::Configuration - Handle a configuration message /*{{{*/ // --------------------------------------------------------------------- /* We stash the desired pipeline depth */ bool HttpMethod::Configuration(string Message) { if (pkgAcqMethod::Configuration(Message) == false) return false; AllowRedirect = _config->FindB("Acquire::http::AllowRedirect",true); TimeOut = _config->FindI("Acquire::http::Timeout",TimeOut); PipelineDepth = _config->FindI("Acquire::http::Pipeline-Depth", PipelineDepth); Debug = _config->FindB("Debug::Acquire::http",false); return true; } /*}}}*/ // HttpMethod::Loop - Main loop /*{{{*/ // --------------------------------------------------------------------- /* */ int HttpMethod::Loop() { typedef vector<string> StringVector; typedef vector<string>::iterator StringVectorIterator; map<string, StringVector> Redirected; signal(SIGTERM,SigTerm); signal(SIGINT,SigTerm); Server = 0; int FailCounter = 0; while (1) { // We have no commands, wait for some to arrive if (Queue == 0) { if (WaitFd(STDIN_FILENO) == false) return 0; } /* Run messages, we can accept 0 (no message) if we didn't do a WaitFd above.. Otherwise the FD is closed. */ int Result = Run(true); if (Result != -1 && (Result != 0 || Queue == 0)) return 100; if (Queue == 0) continue; // Connect to the server if (Server == 0 || Server->Comp(Queue->Uri) == false) { delete Server; Server = new ServerState(Queue->Uri,this); } /* If the server has explicitly said this is the last connection then we pre-emptively shut down the pipeline and tear down the connection. This will speed up HTTP/1.0 servers a tad since we don't have to wait for the close sequence to complete */ if (Server->Persistent == false) Server->Close(); // Reset the pipeline if (Server->ServerFd == -1) QueueBack = Queue; // Connnect to the host if (Server->Open() == false) { Fail(true); delete Server; Server = 0; continue; } // Fill the pipeline. Fetch(0); // Fetch the next URL header data from the server. switch (Server->RunHeaders()) { case 0: break; // The header data is bad case 2: { _error->Error(_("Bad header data")); Fail(true); RotateDNS(); continue; } // The server closed a connection during the header get.. default: case 1: { FailCounter++; _error->Discard(); Server->Close(); Server->Pipeline = false; if (FailCounter >= 2) { Fail(_("Connection failed"),true); FailCounter = 0; } RotateDNS(); continue; } }; // Decide what to do. FetchResult Res; Res.Filename = Queue->DestFile; switch (DealWithHeaders(Res,Server)) { // Ok, the file is Open case 0: { URIStart(Res); // Run the data bool Result = Server->RunData(); /* If the server is sending back sizeless responses then fill in the size now */ if (Res.Size == 0) Res.Size = File->Size(); // Close the file, destroy the FD object and timestamp it FailFd = -1; delete File; File = 0; // Timestamp struct utimbuf UBuf; time(&UBuf.actime); UBuf.actime = Server->Date; UBuf.modtime = Server->Date; utime(Queue->DestFile.c_str(),&UBuf); // Send status to APT if (Result == true) { Res.TakeHashes(*Server->In.Hash); URIDone(Res); } else { if (Server->ServerFd == -1) { FailCounter++; _error->Discard(); Server->Close(); if (FailCounter >= 2) { Fail(_("Connection failed"),true); FailCounter = 0; } QueueBack = Queue; } else Fail(true); } break; } // IMS hit case 1: { URIDone(Res); break; } // Hard server error, not found or something case 3: { Fail(); break; } // Hard internal error, kill the connection and fail case 5: { delete File; File = 0; Fail(); RotateDNS(); Server->Close(); break; } // We need to flush the data, the header is like a 404 w/ error text case 4: { Fail(); // Send to content to dev/null File = new FileFd("/dev/null",FileFd::WriteExists); Server->RunData(); delete File; File = 0; break; } // Try again with a new URL case 6: { // Clear rest of response if there is content if (Server->HaveContent) { File = new FileFd("/dev/null",FileFd::WriteExists); Server->RunData(); delete File; File = 0; } /* Detect redirect loops. No more redirects are allowed after the same URI is seen twice in a queue item. */ StringVector &R = Redirected[Queue->DestFile]; bool StopRedirects = false; if (R.size() == 0) R.push_back(Queue->Uri); else if (R[0] == "STOP" || R.size() > 10) StopRedirects = true; else { for (StringVectorIterator I = R.begin(); I != R.end(); I++) if (Queue->Uri == *I) { R[0] = "STOP"; break; } R.push_back(Queue->Uri); } if (StopRedirects == false) Redirect(NextURI); else Fail(); break; } default: Fail(_("Internal error")); break; } FailCounter = 0; } return 0; } /*}}}*/ int main() { setlocale(LC_ALL, ""); // ignore SIGPIPE, this can happen on write() if the socket // closes the connection (this is dealt with via ServerDie()) signal(SIGPIPE, SIG_IGN); HttpMethod Mth; return Mth.Loop(); }