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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ HTTP and HTTPS share a lot of common code and these classes are
+ exactly the dumping ground for this common code
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#include <config.h>
+
+#include <apt-pkg/fileutl.h>
+#include <apt-pkg/acquire-method.h>
+#include <apt-pkg/configuration.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/hashes.h>
+#include <apt-pkg/netrc.h>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <climits>
+#include <iostream>
+#include <map>
+
+// Internet stuff
+#include <netdb.h>
+
+#include "config.h"
+#include "connect.h"
+#include "rfc2553emu.h"
+#include "http.h"
+
+#include <apti18n.h>
+ /*}}}*/
+using namespace std;
+
+string ServerMethod::FailFile;
+int ServerMethod::FailFd = -1;
+time_t ServerMethod::FailTime = 0;
+
+// 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 */
+ServerState::RunHeadersResult ServerState::RunHeaders(FileFd * const File)
+{
+ 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 (ReadHeaderLines(Data) == false)
+ continue;
+
+ if (Owner->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 RUN_HEADERS_PARSE_ERROR;
+ I = J;
+ }
+
+ // 100 Continue is a Nop...
+ if (Result == 100)
+ continue;
+
+ // Tidy up the connection persistence state.
+ if (Encoding == Closes && HaveContent == true)
+ Persistent = false;
+
+ return RUN_HEADERS_OK;
+ }
+ while (LoadNextResponse(false, File) == true);
+
+ return RUN_HEADERS_IO_ERROR;
+}
+ /*}}}*/
+// ServerState::HeaderLine - Process a header line /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool ServerState::HeaderLine(string Line)
+{
+ if (Line.empty() == true)
+ return true;
+
+ 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] == '/')
+ {
+ int const elements = sscanf(Line.c_str(),"HTTP/%3u.%3u %3u%359[^\n]",&Major,&Minor,&Result,Code);
+ if (elements == 3)
+ {
+ Code[0] = '\0';
+ if (Owner->Debug == true)
+ clog << "HTTP server doesn't give Reason-Phrase for " << Result << std::endl;
+ }
+ else if (elements != 4)
+ return _error->Error(_("The HTTP server sent an invalid reply header"));
+ }
+ else
+ {
+ Major = 0;
+ Minor = 9;
+ if (sscanf(Line.c_str(),"HTTP %3u%359[^\n]",&Result,Code) != 2)
+ return _error->Error(_("The HTTP server sent an invalid reply header"));
+ }
+
+ /* Check the HTTP response header to get the default persistence
+ 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;
+
+ Size = strtoull(Val.c_str(), NULL, 10);
+ if (Size >= std::numeric_limits<unsigned long long>::max())
+ return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
+ else if (Size == 0)
+ HaveContent = false;
+ return true;
+ }
+
+ if (stringcasecmp(Tag,"Content-Type:") == 0)
+ {
+ HaveContent = true;
+ return true;
+ }
+
+ if (stringcasecmp(Tag,"Content-Range:") == 0)
+ {
+ HaveContent = true;
+
+ // ยง14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
+ if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&Size) == 1)
+ {
+ StartPos = 1; // ignore Content-Length, it would override Size
+ HaveContent = false;
+ }
+ else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&Size) != 2)
+ return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
+ if ((unsigned long long)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 (RFC1123StrToTime(Val.c_str(), Date) == false)
+ return _error->Error(_("Unknown date format"));
+ return true;
+ }
+
+ if (stringcasecmp(Tag,"Location:") == 0)
+ {
+ Location = Val;
+ return true;
+ }
+
+ return true;
+}
+ /*}}}*/
+// ServerState::ServerState - Constructor /*{{{*/
+ServerState::ServerState(URI Srv, ServerMethod *Owner) : ServerName(Srv), TimeOut(120), Owner(Owner)
+{
+ Reset();
+}
+ /*}}}*/
+
+bool ServerMethod::Configuration(string Message) /*{{{*/
+{
+ return pkgAcqMethod::Configuration(Message);
+}
+ /*}}}*/
+
+// ServerMethod::DealWithHeaders - Handle the retrieved header data /*{{{*/
+// ---------------------------------------------------------------------
+/* We look at the header data we got back from the server and decide what
+ to do. Returns DealWithHeadersResult (see http.h for details).
+ */
+ServerMethod::DealWithHeadersResult
+ServerMethod::DealWithHeaders(FetchResult &Res)
+{
+ // Not Modified
+ if (Server->Result == 304)
+ {
+ unlink(Queue->DestFile.c_str());
+ Res.IMSHit = true;
+ Res.LastModified = Queue->LastModified;
+ return IMS_HIT;
+ }
+
+ /* 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
+ && (Server->Result > 300 && Server->Result < 400)
+ && (Server->Result != 300 // Multiple Choices
+ && Server->Result != 304 // Not Modified
+ && Server->Result != 306)) // (Not part of HTTP/1.1, reserved)
+ {
+ if (Server->Location.empty() == true);
+ else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
+ {
+ URI Uri = Queue->Uri;
+ if (Uri.Host.empty() == false)
+ NextURI = URI::SiteOnly(Uri);
+ else
+ NextURI.clear();
+ NextURI.append(DeQuoteString(Server->Location));
+ return TRY_AGAIN_OR_REDIRECT;
+ }
+ else
+ {
+ NextURI = DeQuoteString(Server->Location);
+ URI tmpURI = NextURI;
+ URI Uri = Queue->Uri;
+ // same protocol redirects are okay
+ if (tmpURI.Access == Uri.Access)
+ return TRY_AGAIN_OR_REDIRECT;
+ // as well as http to https
+ else if (Uri.Access == "http" && tmpURI.Access == "https")
+ return TRY_AGAIN_OR_REDIRECT;
+ }
+ /* else pass through for error message */
+ }
+ // retry after an invalid range response without partial data
+ else if (Server->Result == 416)
+ {
+ struct stat SBuf;
+ if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
+ {
+ if ((unsigned long long)SBuf.st_size == Server->Size)
+ {
+ // the file is completely downloaded, but was not moved
+ Server->StartPos = Server->Size;
+ Server->Result = 200;
+ Server->HaveContent = false;
+ }
+ else if (unlink(Queue->DestFile.c_str()) == 0)
+ {
+ NextURI = Queue->Uri;
+ return TRY_AGAIN_OR_REDIRECT;
+ }
+ }
+ }
+
+ /* We have a reply we dont handle. This should indicate a perm server
+ failure */
+ if (Server->Result < 200 || Server->Result >= 300)
+ {
+ char err[255];
+ snprintf(err,sizeof(err)-1,"HttpError%i",Server->Result);
+ SetFailReason(err);
+ _error->Error("%u %s",Server->Result,Server->Code);
+ if (Server->HaveContent == true)
+ return ERROR_WITH_CONTENT_PAGE;
+ return ERROR_UNRECOVERABLE;
+ }
+
+ // This is some sort of 2xx 'data follows' reply
+ Res.LastModified = Server->Date;
+ Res.Size = Server->Size;
+
+ // Open the file
+ delete File;
+ File = new FileFd(Queue->DestFile,FileFd::WriteAny);
+ if (_error->PendingError() == true)
+ return ERROR_NOT_FROM_SERVER;
+
+ FailFile = Queue->DestFile;
+ FailFile.c_str(); // Make sure we dont do a malloc in the signal handler
+ FailFd = File->Fd();
+ FailTime = Server->Date;
+
+ if (Server->InitHashes(*File) == false)
+ {
+ _error->Errno("read",_("Problem hashing file"));
+ return ERROR_NOT_FROM_SERVER;
+ }
+ if (Server->StartPos > 0)
+ Res.ResumePoint = Server->StartPos;
+
+ SetNonBlock(File->Fd(),true);
+ return FILE_IS_OPEN;
+}
+ /*}}}*/
+// ServerMethod::SigTerm - Handle a fatal signal /*{{{*/
+// ---------------------------------------------------------------------
+/* This closes and timestamps the open file. This is necessary to get
+ resume behavoir on user abort */
+void ServerMethod::SigTerm(int)
+{
+ if (FailFd == -1)
+ _exit(100);
+
+ 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);
+}
+ /*}}}*/
+// ServerMethod::Fetch - Fetch an item /*{{{*/
+// ---------------------------------------------------------------------
+/* This adds an item to the pipeline. We keep the pipeline at a fixed
+ depth. */
+bool ServerMethod::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);
+ continue;
+ }
+ }
+
+ return true;
+};
+ /*}}}*/
+// ServerMethod::Loop - Main loop /*{{{*/
+int ServerMethod::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))
+ {
+ if(FailReason.empty() == false ||
+ _config->FindB("Acquire::http::DependOnSTDIN", true) == true)
+ return 100;
+ else
+ return 0;
+ }
+
+ if (Queue == 0)
+ continue;
+
+ // Connect to the server
+ if (Server == 0 || Server->Comp(Queue->Uri) == false)
+ {
+ delete Server;
+ Server = CreateServerState(Queue->Uri);
+ }
+ /* 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->IsOpen() == false)
+ 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(File))
+ {
+ case ServerState::RUN_HEADERS_OK:
+ break;
+
+ // The header data is bad
+ case ServerState::RUN_HEADERS_PARSE_ERROR:
+ {
+ _error->Error(_("Bad header data"));
+ Fail(true);
+ RotateDNS();
+ continue;
+ }
+
+ // The server closed a connection during the header get..
+ default:
+ case ServerState::RUN_HEADERS_IO_ERROR:
+ {
+ 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))
+ {
+ // Ok, the file is Open
+ case FILE_IS_OPEN:
+ {
+ URIStart(Res);
+
+ // Run the data
+ bool Result = true;
+ if (Server->HaveContent)
+ Result = Server->RunData(File);
+
+ /* 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 timeval times[2];
+ times[0].tv_sec = times[1].tv_sec = Server->Date;
+ times[0].tv_usec = times[1].tv_usec = 0;
+ utimes(Queue->DestFile.c_str(), times);
+
+ // Send status to APT
+ if (Result == true)
+ {
+ Res.TakeHashes(*Server->GetHashes());
+ URIDone(Res);
+ }
+ else
+ {
+ if (Server->IsOpen() == false)
+ {
+ FailCounter++;
+ _error->Discard();
+ Server->Close();
+
+ if (FailCounter >= 2)
+ {
+ Fail(_("Connection failed"),true);
+ FailCounter = 0;
+ }
+
+ QueueBack = Queue;
+ }
+ else
+ Fail(true);
+ }
+ break;
+ }
+
+ // IMS hit
+ case IMS_HIT:
+ {
+ URIDone(Res);
+ break;
+ }
+
+ // Hard server error, not found or something
+ case ERROR_UNRECOVERABLE:
+ {
+ Fail();
+ break;
+ }
+
+ // Hard internal error, kill the connection and fail
+ case ERROR_NOT_FROM_SERVER:
+ {
+ 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 ERROR_WITH_CONTENT_PAGE:
+ {
+ Fail();
+
+ // Send to content to dev/null
+ File = new FileFd("/dev/null",FileFd::WriteExists);
+ Server->RunData(File);
+ delete File;
+ File = 0;
+ break;
+ }
+
+ // Try again with a new URL
+ case TRY_AGAIN_OR_REDIRECT:
+ {
+ // Clear rest of response if there is content
+ if (Server->HaveContent)
+ {
+ File = new FileFd("/dev/null",FileFd::WriteExists);
+ Server->RunData(File);
+ 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.empty() == true)
+ 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;
+}
+ /*}}}*/
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-01 20:39:25 +0000