Adding upstream version 2.6.1.upstream/2.6.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 600 insertions, 0 deletions

diff --git a/apt-pkg/acquire-method.cc b/apt-pkg/acquire-method.cc
new file mode 100644
index 0000000..0895825
--- /dev/null
+++ b/apt-pkg/acquire-method.cc
@@ -0,0 +1,600 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Acquire Method
+
+   This is a skeleton class that implements most of the functionality
+   of a method and some useful functions to make method implementation
+   simpler. The methods all derive this and specialize it. The most
+   complex implementation is the http method which needs to provide
+   pipelining, it runs the message engine at the same time it is 
+   downloading files..
+   
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include <config.h>
+
+#include <apt-pkg/acquire-method.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 <algorithm>
+#include <iostream>
+#include <iterator>
+#include <sstream>
+#include <string>
+#include <vector>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+									/*}}}*/
+
+using namespace std;
+
+// poor mans unordered_map::try_emplace for C++11 as it is a C++17 feature /*{{{*/
+template <typename Arg>
+static void try_emplace(std::unordered_map<std::string, std::string> &fields, std::string &&name, Arg &&value)
+{
+   if (fields.find(name) == fields.end())
+      fields.emplace(std::move(name), std::forward<Arg>(value));
+}
+									/*}}}*/
+
+// AcqMethod::pkgAcqMethod - Constructor				/*{{{*/
+// ---------------------------------------------------------------------
+/* This constructs the initialization text */
+pkgAcqMethod::pkgAcqMethod(const char *Ver,unsigned long Flags)
+{
+   std::unordered_map<std::string, std::string> fields;
+   try_emplace(fields, "Version", Ver);
+   if ((Flags & SingleInstance) == SingleInstance)
+      try_emplace(fields, "Single-Instance", "true");
+
+   if ((Flags & Pipeline) == Pipeline)
+      try_emplace(fields, "Pipeline", "true");
+
+   if ((Flags & SendConfig) == SendConfig)
+      try_emplace(fields, "Send-Config", "true");
+
+   if ((Flags & LocalOnly) == LocalOnly)
+      try_emplace(fields, "Local-Only", "true");
+
+   if ((Flags & NeedsCleanup) == NeedsCleanup)
+      try_emplace(fields, "Needs-Cleanup", "true");
+
+   if ((Flags & Removable) == Removable)
+      try_emplace(fields, "Removable", "true");
+
+   if ((Flags & AuxRequests) == AuxRequests)
+      try_emplace(fields, "AuxRequests", "true");
+
+   if ((Flags & SendURIEncoded) == SendURIEncoded)
+      try_emplace(fields, "Send-URI-Encoded", "true");
+
+   SendMessage("100 Capabilities", std::move(fields));
+
+   SetNonBlock(STDIN_FILENO,true);
+
+   Queue = 0;
+   QueueBack = 0;
+}
+									/*}}}*/
+void pkgAcqMethod::SendMessage(std::string const &header, std::unordered_map<std::string, std::string> &&fields) /*{{{*/
+{
+   auto CheckKey = [](std::string const &str) {
+      // Space, hyphen-minus, and alphanum are allowed for keys/headers.
+      return str.find_first_not_of(" -0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz") == std::string::npos;
+   };
+
+   auto CheckValue = [](std::string const &str) {
+      return std::all_of(str.begin(), str.end(), [](unsigned char c) -> bool {
+	 return c > 127			   // unicode
+		|| (c > 31 && c < 127)     // printable chars
+		|| c == '\n' || c == '\t'; // special whitespace
+      });
+   };
+
+   auto Error = [this]() {
+      _error->Error("SECURITY: Message contains control characters, rejecting.");
+      _error->DumpErrors();
+      SendMessage("400 URI Failure", {{"URI", "<UNKNOWN>"}, {"Message", "SECURITY: Message contains control characters, rejecting."}});
+      abort();
+   };
+
+   if (!CheckKey(header))
+      return Error();
+
+   for (auto const &f : fields)
+   {
+      if (!CheckKey(f.first))
+	 return Error();
+      if (!CheckValue(f.second))
+	 return Error();
+   }
+
+   std::cout << header << '\n';
+   for (auto const &f : fields)
+   {
+      if (f.second.empty())
+	 continue;
+      std::cout << f.first << ": ";
+      auto const lines = VectorizeString(f.second, '\n');
+      if (likely(lines.empty() == false))
+      {
+	 std::copy(lines.begin(), std::prev(lines.end()), std::ostream_iterator<std::string>(std::cout, "\n "));
+	 std::cout << *lines.rbegin();
+      }
+      std::cout << '\n';
+   }
+   std::cout << '\n'
+	     << std::flush;
+}
+									/*}}}*/
+// AcqMethod::Fail - A fetch has failed					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgAcqMethod::Fail(bool Transient)
+{
+
+   Fail("", Transient);
+}
+									/*}}}*/
+// AcqMethod::Fail - A fetch has failed					/*{{{*/
+void pkgAcqMethod::Fail(string Err, bool Transient)
+{
+
+   if (not _error->empty())
+   {
+      while (not _error->empty())
+      {
+	 std::string msg;
+	 if (_error->PopMessage(msg))
+	 {
+	    if (not Err.empty())
+	       Err.append("\n");
+	    Err.append(msg);
+	 }
+      }
+   }
+   if (Err.empty())
+      Err = "Undetermined Error";
+
+   // Strip out junk from the error messages
+   std::transform(Err.begin(), Err.end(), Err.begin(), [](char const c) {
+      if (c == '\r' || c == '\n')
+	 return ' ';
+      return c;
+   });
+   if (IP.empty() == false && _config->FindB("Acquire::Failure::ShowIP", true) == true)
+      Err.append(" ").append(IP);
+
+   std::unordered_map<std::string, std::string> fields;
+   if (Queue != nullptr)
+      try_emplace(fields, "URI", Queue->Uri);
+   else
+      try_emplace(fields, "URI", "<UNKNOWN>");
+   try_emplace(fields, "Message", Err);
+
+   if(FailReason.empty() == false)
+      try_emplace(fields, "FailReason", FailReason);
+   if (UsedMirror.empty() == false)
+      try_emplace(fields, "UsedMirror", UsedMirror);
+   if (Transient == true)
+      try_emplace(fields, "Transient-Failure", "true");
+
+   SendMessage("400 URI Failure", std::move(fields));
+
+   if (Queue != nullptr)
+      Dequeue();
+}
+									/*}}}*/
+// AcqMethod::DropPrivsOrDie - Drop privileges or die		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgAcqMethod::DropPrivsOrDie()
+{
+   if (!DropPrivileges()) {
+      Fail(false);
+      exit(112);	/* call the european emergency number */
+   }
+}
+
+									/*}}}*/
+// AcqMethod::URIStart - Indicate a download is starting		/*{{{*/
+void pkgAcqMethod::URIStart(FetchResult &Res)
+{
+   if (Queue == 0)
+      abort();
+
+   std::unordered_map<std::string, std::string> fields;
+   try_emplace(fields, "URI", Queue->Uri);
+   if (Res.Size != 0)
+      try_emplace(fields, "Size", std::to_string(Res.Size));
+   if (Res.LastModified != 0)
+      try_emplace(fields, "Last-Modified", TimeRFC1123(Res.LastModified, true));
+   if (Res.ResumePoint != 0)
+      try_emplace(fields, "Resume-Point", std::to_string(Res.ResumePoint));
+   if (UsedMirror.empty() == false)
+      try_emplace(fields, "UsedMirror", UsedMirror);
+
+   SendMessage("200 URI Start", std::move(fields));
+}
+									/*}}}*/
+// AcqMethod::URIDone - A URI is finished				/*{{{*/
+static void printHashStringList(std::unordered_map<std::string, std::string> &fields, std::string const &Prefix, HashStringList const &list)
+{
+   for (auto const &hash : list)
+   {
+      // very old compatibility name for MD5Sum
+      if (hash.HashType() == "MD5Sum")
+	 try_emplace(fields, Prefix + "MD5-Hash", hash.HashValue());
+      try_emplace(fields, Prefix + hash.HashType() + "-Hash", hash.HashValue());
+   }
+}
+void pkgAcqMethod::URIDone(FetchResult &Res, FetchResult *Alt)
+{
+   if (Queue == 0)
+      abort();
+
+   std::unordered_map<std::string, std::string> fields;
+   try_emplace(fields, "URI", Queue->Uri);
+   if (Res.Filename.empty() == false)
+      try_emplace(fields, "Filename", Res.Filename);
+   if (Res.Size != 0)
+      try_emplace(fields, "Size", std::to_string(Res.Size));
+   if (Res.LastModified != 0)
+      try_emplace(fields, "Last-Modified", TimeRFC1123(Res.LastModified, true));
+   printHashStringList(fields, "", Res.Hashes);
+
+   if (UsedMirror.empty() == false)
+      try_emplace(fields, "UsedMirror", UsedMirror);
+   if (Res.GPGVOutput.empty() == false)
+   {
+      std::ostringstream os;
+      std::copy(Res.GPGVOutput.begin(), Res.GPGVOutput.end() - 1, std::ostream_iterator<std::string>(os, "\n"));
+      os << *Res.GPGVOutput.rbegin();
+      try_emplace(fields, "GPGVOutput", os.str());
+   }
+   if (Res.ResumePoint != 0)
+      try_emplace(fields, "Resume-Point", std::to_string(Res.ResumePoint));
+   if (Res.IMSHit == true)
+      try_emplace(fields, "IMS-Hit", "true");
+
+   if (Alt != nullptr)
+   {
+      if (Alt->Filename.empty() == false)
+	 try_emplace(fields, "Alt-Filename", Alt->Filename);
+      if (Alt->Size != 0)
+	 try_emplace(fields, "Alt-Size", std::to_string(Alt->Size));
+      if (Alt->LastModified != 0)
+	 try_emplace(fields, "Alt-Last-Modified", TimeRFC1123(Alt->LastModified, true));
+      if (Alt->IMSHit == true)
+	 try_emplace(fields, "Alt-IMS-Hit", "true");
+      printHashStringList(fields, "Alt-", Alt->Hashes);
+   }
+
+   SendMessage("201 URI Done", std::move(fields));
+   Dequeue();
+}
+									/*}}}*/
+// AcqMethod::MediaFail - Synchronous request for new media		/*{{{*/
+// ---------------------------------------------------------------------
+/* This sends a 403 Media Failure message to the APT and waits for it
+   to be ackd */
+bool pkgAcqMethod::MediaFail(string Required,string Drive)
+{
+   fprintf(stdout, "403 Media Failure\nMedia: %s\nDrive: %s\n",
+	    Required.c_str(),Drive.c_str());
+   std::cout << "\n" << std::flush;
+
+   vector<string> MyMessages;
+   
+   /* Here we read messages until we find a 603, each non 603 message is
+      appended to the main message list for later processing */
+   while (1)
+   {
+      if (WaitFd(STDIN_FILENO) == false)
+	 return false;
+      
+      if (ReadMessages(STDIN_FILENO,MyMessages) == false)
+	 return false;
+
+      string Message = MyMessages.front();
+      MyMessages.erase(MyMessages.begin());
+      
+      // Fetch the message number
+      char *End;
+      int Number = strtol(Message.c_str(),&End,10);
+      if (End == Message.c_str())
+      {	 
+	 cerr << "Malformed message!" << endl;
+	 exit(100);
+      }
+
+      // Change ack
+      if (Number == 603)
+      {
+	 while (MyMessages.empty() == false)
+	 {
+	    Messages.push_back(MyMessages.front());
+	    MyMessages.erase(MyMessages.begin());
+	 }
+
+	 return !StringToBool(LookupTag(Message,"Failed"),false);
+      }
+      
+      Messages.push_back(Message);
+   }   
+}
+									/*}}}*/
+// AcqMethod::Configuration - Handle the configuration message		/*{{{*/
+// ---------------------------------------------------------------------
+/* This parses each configuration entry and puts it into the _config 
+   Configuration class. */
+bool pkgAcqMethod::Configuration(string Message)
+{
+   ::Configuration &Cnf = *_config;
+   
+   const char *I = Message.c_str();
+   const char *MsgEnd = I + Message.length();
+   
+   unsigned int Length = strlen("Config-Item");
+   for (; I + Length < MsgEnd; I++)
+   {
+      // Not a config item
+      if (I[Length] != ':' || stringcasecmp(I,I+Length,"Config-Item") != 0)
+	 continue;
+      
+      I += Length + 1;
+      
+      for (; I < MsgEnd && *I == ' '; I++);
+      const char *Equals = (const char*) memchr(I, '=', MsgEnd - I);
+      if (Equals == NULL)
+	 return false;
+      const char *End = (const char*) memchr(Equals, '\n', MsgEnd - Equals);
+      if (End == NULL)
+	 End = MsgEnd;
+      
+      Cnf.Set(DeQuoteString(string(I,Equals-I)),
+	      DeQuoteString(string(Equals+1,End-Equals-1)));
+      I = End;
+   }
+   
+   return true;
+}
+									/*}}}*/
+// AcqMethod::Run - Run the message engine				/*{{{*/
+// ---------------------------------------------------------------------
+/* Fetch any messages and execute them. In single mode it returns 1 if
+   there are no more available messages - any other result is a 
+   fatal failure code! */
+int pkgAcqMethod::Run(bool Single)
+{
+   while (1)
+   {
+      // Block if the message queue is empty
+      if (Messages.empty() == true)
+      {
+	 if (Single == false)
+	    if (WaitFd(STDIN_FILENO) == false)
+	       break;
+	 if (ReadMessages(STDIN_FILENO,Messages) == false)
+	    break;
+      }
+            
+      // Single mode exits if the message queue is empty
+      if (Single == true && Messages.empty() == true)
+	 return -1;
+      
+      string Message = Messages.front();
+      Messages.erase(Messages.begin());
+      
+      // Fetch the message number
+      char *End;
+      int Number = strtol(Message.c_str(),&End,10);
+      if (End == Message.c_str())
+      {	 
+	 cerr << "Malformed message!" << endl;
+	 return 100;
+      }
+
+      switch (Number)
+      {	 
+	 case 601:
+	 if (Configuration(Message) == false)
+	    return 100;
+	 break;
+	 
+	 case 600:
+	 {
+	    FetchItem *Tmp = new FetchItem;
+	    
+	    Tmp->Uri = LookupTag(Message,"URI");
+	    Tmp->Proxy(LookupTag(Message, "Proxy"));
+	    Tmp->DestFile = LookupTag(Message,"FileName");
+	    if (RFC1123StrToTime(LookupTag(Message,"Last-Modified"),Tmp->LastModified) == false)
+	       Tmp->LastModified = 0;
+	    Tmp->IndexFile = StringToBool(LookupTag(Message,"Index-File"),false);
+	    Tmp->FailIgnore = StringToBool(LookupTag(Message,"Fail-Ignore"),false);
+	    Tmp->ExpectedHashes = HashStringList();
+	    for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
+	    {
+	       std::string tag = "Expected-";
+	       tag.append(*t);
+	       std::string const hash = LookupTag(Message, tag.c_str());
+	       if (hash.empty() == false)
+		  Tmp->ExpectedHashes.push_back(HashString(*t, hash));
+	    }
+            char *End;
+	    if (Tmp->ExpectedHashes.FileSize() > 0)
+	       Tmp->MaximumSize = Tmp->ExpectedHashes.FileSize();
+	    else
+	       Tmp->MaximumSize = strtoll(LookupTag(Message, "Maximum-Size", "0").c_str(), &End, 10);
+	    Tmp->Next = 0;
+	    
+	    // Append it to the list
+	    FetchItem **I = &Queue;
+	    for (; *I != 0; I = &(*I)->Next);
+	    *I = Tmp;
+	    if (QueueBack == 0)
+	       QueueBack = Tmp;
+
+	    // Notify that this item is to be fetched.
+	    if (URIAcquire(Message, Tmp) == false)
+	       Fail();
+
+	    break;
+	 }
+      }
+   }
+
+   Exit();
+   return 0;
+}
+									/*}}}*/
+// AcqMethod::PrintStatus - privately really send a log/status message	/*{{{*/
+void pkgAcqMethod::PrintStatus(char const * const header, const char* Format,
+			       va_list &args) const
+{
+   string CurrentURI = "<UNKNOWN>";
+   if (Queue != 0)
+      CurrentURI = Queue->Uri;
+   if (UsedMirror.empty() == true)
+      fprintf(stdout, "%s\nURI: %s\nMessage: ",
+	      header, CurrentURI.c_str());
+   else
+      fprintf(stdout, "%s\nURI: %s\nUsedMirror: %s\nMessage: ",
+	      header, CurrentURI.c_str(), UsedMirror.c_str());
+   vfprintf(stdout,Format,args);
+   std::cout << "\n\n" << std::flush;
+}
+									/*}}}*/
+// AcqMethod::Log - Send a log message					/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgAcqMethod::Log(const char *Format,...)
+{
+   va_list args;
+   ssize_t size = 400;
+   std::ostringstream outstr;
+   while (true) {
+      bool ret;
+      va_start(args,Format);
+      ret = iovprintf(outstr, Format, args, size);
+      va_end(args);
+      if (ret == true)
+	 break;
+   }
+   std::unordered_map<std::string, std::string> fields;
+   if (Queue != 0)
+      try_emplace(fields, "URI", Queue->Uri);
+   else
+      try_emplace(fields, "URI", "<UNKNOWN>");
+   if (not UsedMirror.empty())
+      try_emplace(fields, "UsedMirror", UsedMirror);
+   try_emplace(fields, "Message", outstr.str());
+   SendMessage("101 Log", std::move(fields));
+}
+									/*}}}*/
+// AcqMethod::Status - Send a status message				/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+void pkgAcqMethod::Status(const char *Format,...)
+{
+   va_list args;
+   ssize_t size = 400;
+   std::ostringstream outstr;
+   while (true) {
+      bool ret;
+      va_start(args,Format);
+      ret = iovprintf(outstr, Format, args, size);
+      va_end(args);
+      if (ret == true)
+	 break;
+   }
+   std::unordered_map<std::string, std::string> fields;
+   if (Queue != 0)
+      try_emplace(fields, "URI", Queue->Uri);
+   else
+      try_emplace(fields, "URI", "<UNKNOWN>");
+   if (not UsedMirror.empty())
+      try_emplace(fields, "UsedMirror", UsedMirror);
+   try_emplace(fields, "Message", outstr.str());
+   SendMessage("102 Status", std::move(fields));
+}
+									/*}}}*/
+// AcqMethod::Redirect - Send a redirect message                       /*{{{*/
+// ---------------------------------------------------------------------
+/* This method sends the redirect message and dequeues the item as
+ * the worker will enqueue again later on to the right queue */
+void pkgAcqMethod::Redirect(const string &NewURI)
+{
+   if (NewURI.find_first_not_of(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~") != std::string::npos)
+   {
+      _error->Error("SECURITY: URL redirect target contains control characters, rejecting.");
+      Fail();
+      return;
+   }
+   std::unordered_map<std::string, std::string> fields;
+   try_emplace(fields, "URI", Queue->Uri);
+   try_emplace(fields, "New-URI", NewURI);
+   SendMessage("103 Redirect", std::move(fields));
+   Dequeue();
+}
+                                                                        /*}}}*/
+// AcqMethod::FetchResult::FetchResult - Constructor			/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgAcqMethod::FetchResult::FetchResult() : LastModified(0),
+                                   IMSHit(false), Size(0), ResumePoint(0), d(NULL)
+{
+}
+									/*}}}*/
+// AcqMethod::FetchResult::TakeHashes - Load hashes			/*{{{*/
+// ---------------------------------------------------------------------
+/* This hides the number of hashes we are supporting from the caller. 
+   It just deals with the hash class. */
+void pkgAcqMethod::FetchResult::TakeHashes(class Hashes &Hash)
+{
+   Hashes = Hash.GetHashStringList();
+}
+									/*}}}*/
+void pkgAcqMethod::Dequeue() {						/*{{{*/
+   FetchItem const * const Tmp = Queue;
+   Queue = Queue->Next;
+   if (Tmp == QueueBack)
+      QueueBack = Queue;
+   delete Tmp;
+}
+									/*}}}*/
+pkgAcqMethod::~pkgAcqMethod() {}
+
+struct pkgAcqMethod::FetchItem::Private
+{
+   std::string Proxy;
+};
+
+pkgAcqMethod::FetchItem::FetchItem() : Next(nullptr), DestFileFd(-1), LastModified(0), IndexFile(false),
+				       FailIgnore(false), MaximumSize(0), d(new Private)
+{}
+
+std::string pkgAcqMethod::FetchItem::Proxy()
+{
+   return d->Proxy;
+}
+
+void pkgAcqMethod::FetchItem::Proxy(std::string const &Proxy)
+{
+   d->Proxy = Proxy;
+}
+
+pkgAcqMethod::FetchItem::~FetchItem() { delete d; }
+
+pkgAcqMethod::FetchResult::~FetchResult() {}