apt-pkg/contrib/gpgv.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    Helpers to deal with gpgv better and more easily
   6
   7    ##################################################################### */
   8                                                                         /*}}}*/
   9 #ifndef CONTRIB_GPGV_H
  10 #define CONTRIB_GPGV_H
  11
  12 #include <string>
  13 #include <vector>
  14
  15 #include <apt-pkg/fileutl.h>
  16
  17 #if __GNUC__ >= 4
  18         #define APT_noreturn    __attribute__ ((noreturn))
  19 #else
  20         #define APT_noreturn    /* no support */
  21 #endif
  22
  23 /** \brief generates and run the command to verify a file with gpgv
  24  *
  25  * If File and FileSig specify the same file it is assumed that we
  26  * deal with a clear-signed message. Note that the method will accept
  27  * and validate files which include additional (unsigned) messages
  28  * without complaining. Do NOT open files accepted by this method
  29  * for reading. Use #OpenMaybeClearSignedFile to access the message
  30  * instead to ensure you are only reading signed data.
  31  *
  32  * The method does not return, but has some noteable exit-codes:
  33  * 111 signals an internal error like the inability to execute gpgv,
  34  * 112 indicates a clear-signed file which doesn't include a message,
  35  *  which can happen if APT is run while on a network requiring
  36  *  authentication before usage (e.g. in hotels)
  37  * All other exit-codes are passed-through from gpgv.
  38  *
  39  * @param File is the message (unsigned or clear-signed)
  40  * @param FileSig is the signature (detached or clear-signed)
  41  */
  42 void ExecGPGV(std::string const &File, std::string const &FileSig,
  43       int const &statusfd, int fd[2]) APT_noreturn;
  44 inline void ExecGPGV(std::string const &File, std::string const &FileSig,
  45       int const &statusfd = -1) {
  46    int fd[2];
  47    ExecGPGV(File, FileSig, statusfd, fd);
  48 };
  49
  50 #undef APT_noreturn
  51
  52 /** \brief Split an inline signature into message and signature
  53  *
  54  *  Takes a clear-signed message and puts the first signed message
  55  *  in the content file and all signatures following it into the
  56  *  second. Unsigned messages, additional messages as well as
  57  *  whitespaces are discarded. The resulting files are suitable to
  58  *  be checked with gpgv.
  59  *
  60  *  If a FileFd pointers is NULL it will not be used and the content
  61  *  which would have been written to it is silently discarded.
  62  *
  63  *  The content of the split files is undefined if the splitting was
  64  *  unsuccessful.
  65  *
  66  *  Note that trying to split an unsigned file will fail, but
  67  *  not generate an error message.
  68  *
  69  *  @param InFile is the clear-signed file
  70  *  @param ContentFile is the FileFd the message will be written to
  71  *  @param ContentHeader is a list of all required Amored Headers for the message
  72  *  @param SignatureFile is the FileFd all signatures will be written to
  73  *  @return true if the splitting was successful, false otherwise
  74  */
  75 bool SplitClearSignedFile(std::string const &InFile, FileFd * const ContentFile,
  76       std::vector<std::string> * const ContentHeader, FileFd * const SignatureFile);
  77
  78 /** \brief open a file which might be clear-signed
  79  *
  80  * This method tries to extract the (signed) message of a file.
  81  * If the file isn't signed it will just open the given filename.
  82  * Otherwise the message is extracted to a temporary file which
  83  * will be opened instead.
  84  *
  85  * @param ClearSignedFileName is the name of the file to open
  86  * @param[out] MessageFile is the FileFd in which the file will be opened
  87  * @return true if opening was successful, otherwise false
  88  */
  89 bool OpenMaybeClearSignedFile(std::string const &ClearSignedFileName, FileFd &MessageFile);
  90
  91 #endif