rework hashsum verification in the acquire system

[apt.git] / apt-pkg / contrib / hashes.h

diff --git a/apt-pkg/contrib/hashes.h b/apt-pkg/contrib/hashes.h
index 979ee1eb88a11aa533350db20cbf64e6a4f72c3e..176ce4faa8593a3394c578f91ed2f18dea102e4a 100644 (file)
--- a/apt-pkg/contrib/hashes.h
+++ b/apt-pkg/contrib/hashes.h
@@ -17,6 +17,7 @@
 #include <apt-pkg/md5.h>
 #include <apt-pkg/sha1.h>
 #include <apt-pkg/sha2.h>
 #include <apt-pkg/md5.h>
 #include <apt-pkg/sha1.h>
 #include <apt-pkg/sha2.h>

+#include <apt-pkg/macros.h>

 
 #include <cstring>
 #include <string>
 
 #include <cstring>
 #include <string>


@@ -41,7 +42,7 @@ class HashString
  protected:
    std::string Type;
    std::string Hash;
  protected:
    std::string Type;
    std::string Hash;

-   static const char* _SupportedHashes[10];
+   static const char * _SupportedHashes[10];

 
    // internal helper
    std::string GetHashForFile(std::string filename) const;
 
    // internal helper
    std::string GetHashForFile(std::string filename) const;


@@ -52,7 +53,10 @@ class HashString
    HashString();
 
    // get hash type used
    HashString();
 
    // get hash type used

-   std::string HashType() { return Type; };
+   std::string HashType() const { return Type; };
+   std::string HashValue() const { return Hash; };
+   APT_DEPRECATED std::string HashType() { return Type; };
+   APT_DEPRECATED std::string HashValue() { return Hash; };

 
    // verify the given filename against the currently loaded hash
    bool VerifyFile(std::string filename) const;
 
    // verify the given filename against the currently loaded hash
    bool VerifyFile(std::string filename) const;


@@ -64,35 +68,177 @@ class HashString
    // helper
    std::string toStr() const;                    // convert to str as "type:hash"
    bool empty() const;
    // helper
    std::string toStr() const;                    // convert to str as "type:hash"
    bool empty() const;

+   bool operator==(HashString const &other) const;
+   bool operator!=(HashString const &other) const;

 
    // return the list of hashes we support
 
    // return the list of hashes we support

-   static const char** SupportedHashes();
+   static APT_CONST const char** SupportedHashes();

 };
 
 };
 

-class Hashes
+class HashStringList

 {
    public:
 {
    public:

+   /** find best hash if no specific one is requested
+    *
+    * @param type of the checksum to return, can be \b NULL
+    * @return If type is \b NULL (or the empty string) it will
+    *  return the 'best' hash; otherwise the hash which was
+    *  specifically requested. If no hash is found \b NULL will be returned.
+    */
+   HashString const * find(char const * const type) const;
+   HashString const * find(std::string const &type) const { return find(type.c_str()); }
+
+   /** finds the filesize hash and returns it as number
+    *
+    * @return beware: if the size isn't known we return \b 0 here,
+    * just like we would do for an empty file. If that is a problem
+    * for you have to get the size manually out of the list.
+    */
+   unsigned long long FileSize() const;
+
+   /** check if the given hash type is supported
+    *
+    * @param type to check
+    * @return true if supported, otherwise false
+    */
+   static APT_PURE bool supported(char const * const type);
+   /** add the given #HashString to the list
+    *
+    * @param hashString to add
+    * @return true if the hash is added because it is supported and
+    *  not already a different hash of the same type included, otherwise false
+    */
+   bool push_back(const HashString &hashString);
+   /** @return size of the list of HashStrings */
+   size_t size() const { return list.size(); }
+
+   /** take the 'best' hash and verify file with it
+    *
+    * @param filename to verify
+    * @return true if the file matches the hashsum, otherwise false
+    */
+   bool VerifyFile(std::string filename) const;

 
 

-   MD5Summation MD5;
-   SHA1Summation SHA1;
-   SHA256Summation SHA256;
-   SHA512Summation SHA512;
-   
-   inline bool Add(const unsigned char *Data,unsigned long long Size)
+   /** is the list empty ?
+    *
+    * @return \b true if the list is empty, otherwise \b false
+    */
+   bool empty() const { return list.empty(); }
+
+   /** has the list at least one good entry
+    *
+    * similar to #empty, but handles forced hashes.
+    *
+    * @return if no hash is forced, same result as #empty,
+    * if one is forced \b true if this has is available, \b false otherwise
+    */
+   bool usable() const;
+
+   typedef std::vector<HashString>::const_iterator const_iterator;
+
+   /** iterator to the first element */
+   const_iterator begin() const { return list.begin(); }
+
+   /** iterator to the end element */
+   const_iterator end() const { return list.end(); }
+
+   /** start fresh with a clear list */
+   void clear() { list.clear(); }
+
+   /** compare two HashStringList for similarity.
+    *
+    * Two lists are similar if at least one hashtype is in both lists
+    * and the hashsum matches. All hashes are checked by default,
+    * if one doesn't match false is returned regardless of how many
+    * matched before. If a hash is forced, only this hash is compared,
+    * all others are ignored.
+    */
+   bool operator==(HashStringList const &other) const;
+   bool operator!=(HashStringList const &other) const;
+
+   HashStringList() {}
+
+   // simplifying API-compatibility constructors
+   HashStringList(std::string const &hash) {
+      if (hash.empty() == false)
+        list.push_back(HashString(hash));
+   }
+   HashStringList(char const * const hash) {
+      if (hash != NULL && hash[0] != '\0')
+        list.push_back(HashString(hash));
+   }
+
+   private:
+   std::vector<HashString> list;
+};
+
+class PrivateHashes;
+class Hashes
+{
+   PrivateHashes *d;
+
+   public:
+   /* those will disappear in the future as it is hard to add new ones this way.
+    * Use Add* to build the results and get them via GetHashStringList() instead */
+   APT_DEPRECATED MD5Summation MD5;
+   APT_DEPRECATED SHA1Summation SHA1;
+   APT_DEPRECATED SHA256Summation SHA256;
+   APT_DEPRECATED SHA512Summation SHA512;
+
+   static const int UntilEOF = 0;
+
+   bool Add(const unsigned char * const Data, unsigned long long const Size);
+   APT_DEPRECATED bool Add(const unsigned char * const Data, unsigned long long const Size, unsigned int const Hashes);
+   inline bool Add(const char * const Data)
+   {return Add((unsigned char const * const)Data,strlen(Data));};
+   inline bool Add(const unsigned char * const Beg,const unsigned char * const End)
+   {return Add(Beg,End-Beg);};
+
+   enum SupportedHashes { MD5SUM = (1 << 0), SHA1SUM = (1 << 1), SHA256SUM = (1 << 2),
+      SHA512SUM = (1 << 3) };
+   bool AddFD(int const Fd,unsigned long long Size = 0);
+   APT_DEPRECATED bool AddFD(int const Fd,unsigned long long Size, unsigned int const Hashes);
+   bool AddFD(FileFd &Fd,unsigned long long Size = 0);
+   APT_DEPRECATED bool AddFD(FileFd &Fd,unsigned long long Size, unsigned int const Hashes);
+
+   HashStringList GetHashStringList();
+
+APT_IGNORE_DEPRECATED_PUSH
+   /** create a Hashes object to calculate all supported hashes
+    *
+    * If ALL is too much, you can limit which Hashes are calculated
+    * with the following other constructors which mention explicitly
+    * which hashes to generate. */
+   Hashes();
+   /** @param Hashes bitflag composed of #SupportedHashes */
+   Hashes(unsigned int const Hashes);
+   /** @param Hashes is a list of hashes */
+   Hashes(HashStringList const &Hashes);
+   virtual ~Hashes();
+APT_IGNORE_DEPRECATED_POP
+
+   private:
+   APT_HIDDEN APT_CONST inline unsigned int boolsToFlag(bool const addMD5, bool const addSHA1, bool const addSHA256, bool const addSHA512)

    {
    {

-      return MD5.Add(Data,Size) && SHA1.Add(Data,Size) && SHA256.Add(Data,Size) && SHA512.Add(Data,Size);
+      unsigned int Hashes = ~0;
+      if (addMD5 == false) Hashes &= ~MD5SUM;
+      if (addSHA1 == false) Hashes &= ~SHA1SUM;
+      if (addSHA256 == false) Hashes &= ~SHA256SUM;
+      if (addSHA512 == false) Hashes &= ~SHA512SUM;
+      return Hashes;
+   }
+
+   public:
+APT_IGNORE_DEPRECATED_PUSH
+   APT_DEPRECATED bool AddFD(int const Fd, unsigned long long Size, bool const addMD5,
+        bool const addSHA1, bool const addSHA256, bool const addSHA512) {
+      return AddFD(Fd, Size, boolsToFlag(addMD5, addSHA1, addSHA256, addSHA512));
+   };
+   APT_DEPRECATED bool AddFD(FileFd &Fd, unsigned long long Size, bool const addMD5,
+        bool const addSHA1, bool const addSHA256, bool const addSHA512) {
+      return AddFD(Fd, Size, boolsToFlag(addMD5, addSHA1, addSHA256, addSHA512));

    };
    };

-   inline bool Add(const char *Data) {return Add((unsigned char const *)Data,strlen(Data));};
-   inline bool AddFD(int const Fd,unsigned long long Size = 0)
-   { return AddFD(Fd, Size, true, true, true, true); };
-   bool AddFD(int const Fd, unsigned long long Size, bool const addMD5,
-             bool const addSHA1, bool const addSHA256, bool const addSHA512);
-   inline bool AddFD(FileFd &Fd,unsigned long long Size = 0)
-   { return AddFD(Fd, Size, true, true, true, true); };
-   bool AddFD(FileFd &Fd, unsigned long long Size, bool const addMD5,
-             bool const addSHA1, bool const addSHA256, bool const addSHA512);
-   inline bool Add(const unsigned char *Beg,const unsigned char *End) 
-                  {return Add(Beg,End-Beg);};
+APT_IGNORE_DEPRECATED_POP

 };
 
 #endif
 };
 
 #endif