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685 lines
22 KiB
685 lines
22 KiB
/*
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kpgpbase.cpp
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Copyright (C) 2001,2002 the KPGP authors
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See file AUTHORS.kpgp for details
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This file is part of KPGP, the KDE PGP/GnuPG support library.
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KPGP is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <kdebug.h>
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#include <config.h>
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#include "kpgpbase.h"
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#include "kpgp.h"
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#include "kpgpblock.h"
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#include <stdlib.h> /* setenv, unsetenv */
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#include <unistd.h> /* pipe, close, fork, dup2, execl, _exit, write, read */
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#include <sys/poll.h> /* poll, etc. */
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#include <sys/types.h> /* pid_t */
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#include <sys/wait.h> /* waitpid */
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#include <errno.h>
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#include <qapplication.h>
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namespace Kpgp {
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Base::Base()
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: input(), output(), error(), errMsg(), status(OK)
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{
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}
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Base::~Base()
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{
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}
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void
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Base::clear()
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{
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input = QCString();
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output = QCString();
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error = QCString();
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errMsg = QString::null;
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status = OK;
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}
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int
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Base::run( const char *cmd, const char *passphrase, bool onlyReadFromPGP )
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{
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/* the pipe ppass is used for to pass the password to
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* pgp. passing the password together with the normal input through
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* stdin doesn't seem to work as expected (at least for pgp5.0)
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*/
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char str[1025] = "\0";
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int pin[2], pout[2], perr[2], ppass[2];
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int len, len2;
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FILE *pass;
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pid_t child_pid;
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int childExitStatus;
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struct pollfd pollin, pollout, pollerr;
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int pollstatus;
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if(passphrase)
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{
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pipe(ppass);
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pass = fdopen(ppass[1], "w");
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fwrite(passphrase, sizeof(char), strlen(passphrase), pass);
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fwrite("\n", sizeof(char), 1, pass);
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fclose(pass);
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close(ppass[1]);
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// tell pgp which fd to use for the passphrase
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QCString tmp;
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tmp.sprintf("%d",ppass[0]);
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::setenv("PGPPASSFD",tmp.data(),1);
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//Uncomment these lines for testing only! Doing so will decrease security!
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//kdDebug(5100) << "pgp PGPPASSFD = " << tmp << endl;
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//kdDebug(5100) << "pgp pass = " << passphrase << endl;
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}
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else
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::unsetenv("PGPPASSFD");
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//Uncomment these lines for testing only! Doing so will decrease security!
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kdDebug(5100) << "pgp cmd = " << cmd << endl;
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//kdDebug(5100) << "pgp input = " << QString(input)
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// << "input length = " << input.length() << endl;
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error = "";
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output = "";
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pipe(pin);
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pipe(pout);
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pipe(perr);
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QApplication::flushX();
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if(!(child_pid = fork()))
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{
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/*We're the child.*/
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close(pin[1]);
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dup2(pin[0], 0);
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close(pin[0]);
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close(pout[0]);
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dup2(pout[1], 1);
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close(pout[1]);
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close(perr[0]);
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dup2(perr[1], 2);
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close(perr[1]);
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execl("/bin/sh", "sh", "-c", cmd, (void *)0);
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_exit(127);
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}
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/*Only get here if we're the parent.*/
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close(pin[0]);
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close(pout[1]);
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close(perr[1]);
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// poll for "There is data to read."
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pollout.fd = pout[0];
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pollout.events = POLLIN;
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pollout.revents = 0; // init with 0, just in case
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pollerr.fd = perr[0];
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pollerr.events = POLLIN;
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pollerr.revents = 0; // init with 0, just in case
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// poll for "Writing now will not block."
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pollin.fd = pin[1];
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pollin.events = POLLOUT;
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pollin.revents = 0; // init with 0, just in case
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if (!onlyReadFromPGP) {
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if (!input.isEmpty()) {
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// write to pin[1] one line after the other to prevent dead lock
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for (unsigned int i=0; i<input.length(); i+=len2) {
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len2 = 0;
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// check if writing now to pin[1] will not block (5 ms timeout)
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//kdDebug(5100) << "Polling pin[1]..." << endl;
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pollstatus = poll(&pollin, 1, 5);
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if (pollstatus == 1) {
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//kdDebug(5100) << "Status for polling pin[1]: " << pollin.revents << endl;
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if (pollin.revents & POLLERR) {
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kdDebug(5100) << "PGP seems to have hung up" << endl;
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break;
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}
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else if (pollin.revents & POLLOUT) {
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// search end of next line
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if ((len2 = input.find('\n', i)) == -1)
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len2 = input.length()-i;
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else
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len2 = len2-i+1;
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//kdDebug(5100) << "Trying to write " << len2 << " bytes to pin[1] ..." << endl;
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len2 = write(pin[1], input.mid(i,len2).data(), len2);
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//kdDebug(5100) << "Wrote " << len2 << " bytes to pin[1] ..." << endl;
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}
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}
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else if (!pollstatus) {
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//kdDebug(5100) << "Timeout while polling pin[1]: "
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// << pollin.revents << endl;
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}
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else if (pollstatus == -1) {
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kdDebug(5100) << "Error while polling pin[1]: "
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<< pollin.revents << endl;
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}
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if (pout[0] >= 0) {
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do {
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// check if there is data to read from pout[0]
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//kdDebug(5100) << "Polling pout[0]..." << endl;
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pollstatus = poll(&pollout, 1, 0);
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if (pollstatus == 1) {
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//kdDebug(5100) << "Status for polling pout[0]: " << pollout.revents << endl;
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if (pollout.revents & POLLIN) {
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//kdDebug(5100) << "Trying to read " << 1024 << " bytes from pout[0]" << endl;
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if ((len = read(pout[0],str,1024))>0) {
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//kdDebug(5100) << "Read " << len << " bytes from pout[0]" << endl;
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str[len] ='\0';
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output += str;
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}
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else
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break;
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}
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}
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else if (pollstatus == -1) {
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kdDebug(5100) << "Error while polling pout[0]: "
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<< pollout.revents << endl;
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}
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} while ((pollstatus == 1) && (pollout.revents & POLLIN));
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}
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if (perr[0] >= 0) {
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do {
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// check if there is data to read from perr[0]
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//kdDebug(5100) << "Polling perr[0]..." << endl;
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pollstatus = poll(&pollerr, 1, 0);
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if (pollstatus == 1) {
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//kdDebug(5100) << "Status for polling perr[0]: " << pollerr.revents << endl;
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if (pollerr.revents & POLLIN) {
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//kdDebug(5100) << "Trying to read " << 1024 << " bytes from perr[0]" << endl;
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if ((len = read(perr[0],str,1024))>0) {
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//kdDebug(5100) << "Read " << len << " bytes from perr[0]" << endl;
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str[len] ='\0';
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error += str;
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}
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else
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break;
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}
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}
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else if (pollstatus == -1) {
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kdDebug(5100) << "Error while polling perr[0]: "
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<< pollerr.revents << endl;
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}
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} while ((pollstatus == 1) && (pollerr.revents & POLLIN));
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}
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// abort writing to PGP if PGP hung up
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if ((pollstatus == 1) &&
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((pollout.revents & POLLHUP) || (pollerr.revents & POLLHUP))) {
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kdDebug(5100) << "PGP hung up" << endl;
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break;
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}
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}
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}
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else // if input.isEmpty()
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write(pin[1], "\n", 1);
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//kdDebug(5100) << "All input was written to pin[1]" << endl;
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}
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close(pin[1]);
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pid_t waitpidRetVal;
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do {
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//kdDebug(5100) << "Checking if PGP is still running..." << endl;
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childExitStatus = 0;
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waitpidRetVal = waitpid(child_pid, &childExitStatus, WNOHANG);
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//kdDebug(5100) << "waitpid returned " << waitpidRetVal << endl;
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if (pout[0] >= 0) {
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do {
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// check if there is data to read from pout[0]
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//kdDebug(5100) << "Polling pout[0]..." << endl;
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pollstatus = poll(&pollout, 1, 0);
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if (pollstatus == 1) {
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//kdDebug(5100) << "Status for polling pout[0]: " << pollout.revents << endl;
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if (pollout.revents & POLLIN) {
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//kdDebug(5100) << "Trying to read " << 1024 << " bytes from pout[0]" << endl;
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if ((len = read(pout[0],str,1024))>0) {
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//kdDebug(5100) << "Read " << len << " bytes from pout[0]" << endl;
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str[len] ='\0';
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output += str;
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} else {
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/*
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* Apparently, on NetBSD when the child dies, the pipe begins
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* receiving empty data packets *before* waitpid() has signaled
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* that the child has died. Also, notice that this happens
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* without any error bit being set in pollfd.revents (is this a
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* NetBSD bug??? ). Notice that these anomalous packets exist
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* according to poll(), but have length 0 according to read().
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* Thus, kde can remain stuck inside this loop.
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*
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* A solution to this problem is to get out of the inner loop
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* when read() returns <=0. In this way, kde has another chance
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* to call waitpid() to check if the child has died -- and this
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* time the call should succeed.
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*
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* Setting POLLHUP in pollfd.revents is not necessary, but I just
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* like the idea of signaling that something strange has
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* happened.
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*/
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pollout.revents |= POLLHUP;
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break;
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}
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}
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}
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else if (pollstatus == -1) {
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kdDebug(5100) << "Error while polling pout[0]: "
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<< pollout.revents << endl;
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}
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} while ((pollstatus == 1) && (pollout.revents & POLLIN));
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}
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if (perr[0] >= 0) {
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do {
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// check if there is data to read from perr[0]
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//kdDebug(5100) << "Polling perr[0]..." << endl;
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pollstatus = poll(&pollerr, 1, 0);
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if (pollstatus == 1) {
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//kdDebug(5100) << "Status for polling perr[0]: " << pollerr.revents << endl;
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if (pollerr.revents & POLLIN) {
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//kdDebug(5100) << "Trying to read " << 1024 << " bytes from perr[0]" << endl;
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if ((len = read(perr[0],str,1024))>0) {
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//kdDebug(5100) << "Read " << len << " bytes from perr[0]" << endl;
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str[len] ='\0';
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error += str;
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} else {
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/*
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* Apparently, on NetBSD when the child dies, the pipe begins
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* receiving empty data packets *before* waitpid() has signaled
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* that the child has died. Also, notice that this happens
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* without any error bit being set in pollfd.revents (is this a
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* NetBSD bug??? ). Notice that these anomalous packets exist
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* according to poll(), but have length 0 according to read().
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* Thus, kde can remain stuck inside this loop.
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*
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* A solution to this problem is to get out of the inner loop
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* when read() returns <=0. In this way, kde has another chance
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* to call waitpid() to check if the child has died -- and this
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* time the call should succeed.
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*
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* Setting POLLHUP in pollfd.revents is not necessary, but I just
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* like the idea of signaling that something strange has
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* happened.
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*/
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pollerr.revents |= POLLHUP;
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break;
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}
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}
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}
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else if (pollstatus == -1) {
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kdDebug(5100) << "Error while polling perr[0]: "
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<< pollerr.revents << endl;
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}
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} while ((pollstatus == 1) && (pollerr.revents & POLLIN));
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}
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} while (waitpidRetVal == 0);
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close(pout[0]);
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close(perr[0]);
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unsetenv("PGPPASSFD");
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if(passphrase)
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close(ppass[0]);
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// Did the child exit normally?
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if (WIFEXITED(childExitStatus) != 0) {
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// Get the return code of the child
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childExitStatus = WEXITSTATUS(childExitStatus);
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kdDebug(5100) << "PGP exited with exit status " << childExitStatus
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<< endl;
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}
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else {
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childExitStatus = -1;
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kdDebug(5100) << "PGP exited abnormally!" << endl;
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}
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//Uncomment these lines for testing only! Doing so will decrease security!
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//kdDebug(5100) << "pgp output = " << QString(output) << endl;
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//kdDebug(5100) << "pgp error = " << error << endl;
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/* Make the information visible, so that a user can
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* get to know what's going on during the pgp calls.
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*/
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kdDebug(5100) << error << endl;
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return childExitStatus;
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}
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int
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Base::runGpg( const char *cmd, const char *passphrase, bool onlyReadFromGnuPG )
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{
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/* the pipe ppass is used for to pass the password to
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* pgp. passing the password together with the normal input through
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* stdin doesn't seem to work as expected (at least for pgp5.0)
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*/
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char str[1025] = "\0";
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int pin[2], pout[2], perr[2], ppass[2];
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int len, len2;
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FILE *pass;
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pid_t child_pid;
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int childExitStatus;
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char gpgcmd[1024] = "\0";
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struct pollfd poller[3];
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int num_pollers = 0;
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const int STD_OUT = 0;
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const int STD_ERR = 1;
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const int STD_IN = 2;
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int pollstatus;
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if(passphrase)
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{
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pipe(ppass);
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pass = fdopen(ppass[1], "w");
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fwrite(passphrase, sizeof(char), strlen(passphrase), pass);
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fwrite("\n", sizeof(char), 1, pass);
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fclose(pass);
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close(ppass[1]);
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//Uncomment these lines for testing only! Doing so will decrease security!
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//kdDebug(5100) << "pass = " << passphrase << endl;
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}
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//Uncomment these lines for testing only! Doing so will decrease security!
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//kdDebug(5100) << "pgp cmd = " << cmd << endl;
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//kdDebug(5100) << "pgp input = " << QString(input)
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// << "input length = " << input.length() << endl;
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error = "";
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output = "";
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pipe(pin);
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pipe(pout);
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pipe(perr);
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if( passphrase ) {
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if( mVersion >= "1.0.7" ) {
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// GnuPG >= 1.0.7 supports the gpg-agent, so we look for it.
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if( 0 == getenv("GPG_AGENT_INFO") ) {
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// gpg-agent not found, so we tell gpg not to use the agent
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snprintf( gpgcmd, 1023,
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"LANGUAGE=C gpg --no-use-agent --passphrase-fd %d %s",
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ppass[0], cmd );
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}
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else {
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// gpg-agent seems to be running, so we tell gpg to use the agent
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snprintf( gpgcmd, 1023,
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"LANGUAGE=C gpg --use-agent %s",
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cmd );
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}
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}
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else {
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// GnuPG < 1.0.7 doesn't know anything about the gpg-agent
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snprintf( gpgcmd, 1023,
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"LANGUAGE=C gpg --passphrase-fd %d %s",
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ppass[0], cmd );
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}
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}
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else {
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snprintf(gpgcmd, 1023, "LANGUAGE=C gpg %s",cmd);
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}
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QApplication::flushX();
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if(!(child_pid = fork()))
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{
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/*We're the child.*/
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close(pin[1]);
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dup2(pin[0], 0);
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close(pin[0]);
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close(pout[0]);
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dup2(pout[1], 1);
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close(pout[1]);
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close(perr[0]);
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dup2(perr[1], 2);
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close(perr[1]);
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//#warning FIXME: there has to be a better way to do this
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/* this is nasty nasty nasty (but it works) */
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if( passphrase ) {
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if( mVersion >= "1.0.7" ) {
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// GnuPG >= 1.0.7 supports the gpg-agent, so we look for it.
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if( 0 == getenv("GPG_AGENT_INFO") ) {
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// gpg-agent not found, so we tell gpg not to use the agent
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snprintf( gpgcmd, 1023,
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"LANGUAGE=C gpg --no-use-agent --passphrase-fd %d %s",
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ppass[0], cmd );
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}
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else {
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// gpg-agent seems to be running, so we tell gpg to use the agent
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snprintf( gpgcmd, 1023,
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"LANGUAGE=C gpg --use-agent %s",
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cmd );
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}
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}
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else {
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// GnuPG < 1.0.7 doesn't know anything about the gpg-agent
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snprintf( gpgcmd, 1023,
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"LANGUAGE=C gpg --passphrase-fd %d %s",
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ppass[0], cmd );
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}
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}
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else {
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snprintf(gpgcmd, 1023, "LANGUAGE=C gpg %s",cmd);
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}
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|
|
kdDebug(5100) << "pgp cmd = " << gpgcmd << endl;
|
|
|
|
execl("/bin/sh", "sh", "-c", gpgcmd, (void *)0);
|
|
_exit(127);
|
|
}
|
|
|
|
// Only get here if we're the parent.
|
|
|
|
close(pin[0]);
|
|
close(pout[1]);
|
|
close(perr[1]);
|
|
|
|
// poll for "There is data to read."
|
|
poller[STD_OUT].fd = pout[0];
|
|
poller[STD_OUT].events = POLLIN;
|
|
poller[STD_ERR].fd = perr[0];
|
|
poller[STD_ERR].events = POLLIN;
|
|
num_pollers = 2;
|
|
|
|
if (!onlyReadFromGnuPG) {
|
|
// poll for "Writing now will not block."
|
|
poller[STD_IN].fd = pin[1];
|
|
poller[STD_IN].events = POLLOUT;
|
|
num_pollers = 3;
|
|
} else {
|
|
close (pin[1]);
|
|
pin[1] = -1;
|
|
}
|
|
|
|
pid_t waitpidRetVal;
|
|
unsigned int input_pos = 0;
|
|
|
|
do {
|
|
//kdDebug(5100) << "Checking if GnuPG is still running..." << endl;
|
|
childExitStatus = 0;
|
|
waitpidRetVal = waitpid(child_pid, &childExitStatus, WNOHANG);
|
|
//kdDebug(5100) << "waitpid returned " << waitpidRetVal << endl;
|
|
do {
|
|
// poll the pipes
|
|
pollstatus = poll(poller, num_pollers, 10);
|
|
if( 0 < pollstatus ) {
|
|
// Check stdout.
|
|
if (poller[STD_OUT].revents & POLLIN) {
|
|
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from pout[0]" << endl;
|
|
if ((len = read(pout[0],str,1024))>0) {
|
|
//kdDebug(5100) << "Read " << len << " bytes from pout[0]" << endl;
|
|
str[len] ='\0';
|
|
output += str;
|
|
}
|
|
else {
|
|
// FreeBSD/NetBSD workaround
|
|
//
|
|
// Apparently, on Free/NetBSD when the child dies, the pipe begins
|
|
// receiving empty data packets *before* waitpid() has signaled
|
|
// that the child has died. Also, notice that this happens
|
|
// without any error bit being set in pollfd.revents (is this a
|
|
// Free/NetBSD bug??? ). Notice that these anomalous packets exist
|
|
// according to poll(), but have length 0 according to read().
|
|
// Thus, we can remain stuck inside this loop.
|
|
//
|
|
// A solution to this problem is to get out of the inner loop
|
|
// when read() returns <=0. In this way, we have another chance
|
|
// to call waitpid() to check if the child has died -- and this
|
|
// time the call should succeed.
|
|
//
|
|
// Set POLLHUP in pollfd.revents to signal that something strange
|
|
// has happened and disable polling of stdout.
|
|
poller[STD_OUT].revents |= POLLHUP;
|
|
poller[STD_OUT].events = 0;
|
|
}
|
|
} else if (poller[STD_OUT].revents & POLLHUP) {
|
|
// disable polling of stdout
|
|
poller[STD_OUT].events = 0;
|
|
}
|
|
|
|
// Check stderr.
|
|
if (poller[STD_ERR].revents & POLLIN) {
|
|
//kdDebug(5100) << "Trying to read " << 1024 << " bytes from perr[0]" << endl;
|
|
if ((len = read(poller[STD_ERR].fd,str,1024))>0) {
|
|
//kdDebug(5100) << "Read " << len << " bytes from perr[0]" << endl;
|
|
str[len] ='\0';
|
|
error += str;
|
|
}
|
|
else {
|
|
// FreeBSD/NetBSD workaround (for details see above)
|
|
poller[STD_ERR].revents |= POLLHUP;
|
|
poller[STD_ERR].events = 0;
|
|
}
|
|
} else if (poller[STD_ERR].revents & POLLHUP) {
|
|
// disable polling of stderr
|
|
poller[STD_ERR].events = 0;
|
|
}
|
|
|
|
if (num_pollers > 2) {
|
|
if (poller[STD_IN].revents & ( POLLERR | POLLHUP ) ) {
|
|
kdDebug(5100) << "GnuPG seems to have hung up" << endl;
|
|
close (pin[1]);
|
|
pin[1] = -1;
|
|
--num_pollers;
|
|
}
|
|
else if (poller[STD_IN].revents & POLLOUT) {
|
|
if (!input.isEmpty()) {
|
|
// search end of next line
|
|
if ((len2 = input.find('\n', input_pos)) == -1)
|
|
len2 = input.length()-input_pos;
|
|
else
|
|
len2 = len2-input_pos+1;
|
|
|
|
//kdDebug(5100) << "Trying to write " << len2 << " bytes to pin[1] ..." << endl;
|
|
len2 = write(pin[1], input.mid(input_pos,len2).data(), len2);
|
|
//kdDebug(5100) << "Wrote " << len2 << " bytes to pin[1] ..." << endl;
|
|
input_pos += len2;
|
|
|
|
// We are done.
|
|
if (input_pos >= input.length()) {
|
|
//kdDebug(5100) << "All input was written to pin[1]" << endl;
|
|
close (pin[1]);
|
|
pin[1] = -1;
|
|
--num_pollers;
|
|
}
|
|
}
|
|
else { // if input.isEmpty()
|
|
write(pin[1], "\n", 1);
|
|
//kdDebug(5100) << "All input was written to pin[1]" << endl;
|
|
close (pin[1]);
|
|
pin[1] = -1;
|
|
--num_pollers;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} while ( (pollstatus > 0) && ( (num_pollers > 2)
|
|
|| (poller[STD_OUT].events != 0)
|
|
|| (poller[STD_ERR].events != 0) ) );
|
|
|
|
if (pollstatus == -1) {
|
|
kdDebug(5100) << "GnuPG poll failed, errno: " << errno << endl;
|
|
}
|
|
|
|
} while(waitpidRetVal == 0);
|
|
|
|
if( 0 <= pin[1] )
|
|
close (pin[1]);
|
|
close(pout[0]);
|
|
close(perr[0]);
|
|
|
|
if(passphrase)
|
|
close(ppass[0]);
|
|
|
|
// Did the child exit normally?
|
|
if (WIFEXITED(childExitStatus) != 0) {
|
|
// Get the return code of the child
|
|
childExitStatus = WEXITSTATUS(childExitStatus);
|
|
kdDebug(5100) << "GnuPG exited with exit status " << childExitStatus
|
|
<< endl;
|
|
}
|
|
else {
|
|
childExitStatus = -1;
|
|
kdDebug(5100) << "GnuPG exited abnormally!" << endl;
|
|
}
|
|
|
|
//Uncomment these lines for testing only! Doing so will decrease security!
|
|
//kdDebug(5100) << "gpg stdout:\n" << QString(output) << endl;
|
|
|
|
// Make the information visible, so that a user can
|
|
// get to know what's going on during the gpg calls.
|
|
kdDebug(5100) << "gpg stderr:\n" << error << endl;
|
|
|
|
return childExitStatus;
|
|
}
|
|
|
|
|
|
QCString
|
|
Base::addUserId()
|
|
{
|
|
QCString cmd;
|
|
QCString pgpUser = Module::getKpgp()->user();
|
|
|
|
if(!pgpUser.isEmpty())
|
|
{
|
|
cmd += " -u 0x";
|
|
cmd += pgpUser;
|
|
return cmd;
|
|
}
|
|
return QCString();
|
|
}
|
|
|
|
|
|
} // namespace Kpgp
|