File indexing completed on 2024-04-14 05:20:29

 /*
     SPDX-FileCopyrightText: 2019 Christoph Roick <chrisito@gmx.de>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #include "ptracer.h"
 
 #ifdef Q_OS_LINUX
 
 #include "drkonqi_debug.h"
 
 #include <QFile>
 #include <QStandardPaths>
 
 #include <sys/socket.h>
 #include <sys/un.h>
 
 #include <errno.h>
 #include <poll.h>
 #include <unistd.h>
 
 void setPtracer(qint64 debuggerpid, qint64 debuggeepid)
 {
     int sfd = socket(PF_UNIX, SOCK_STREAM, 0);
     if (sfd < 0) {
         qCWarning(DRKONQI_LOG) << "socket to set ptracer not accessible";
         return;
     }
 
     static struct sockaddr_un server;
     static socklen_t sl = sizeof(server);
     server.sun_family = AF_UNIX;
     const QString socketPath = QStringLiteral("%1/kcrash_%2").arg(QStandardPaths::writableLocation(QStandardPaths::RuntimeLocation)).arg(debuggeepid);
 
     if (socketPath.size() >= static_cast<int>(sizeof(server.sun_path))) {
         qCWarning(DRKONQI_LOG) << "socket path is too long";
         close(sfd);
         return;
     }
     strcpy(server.sun_path, QFile::encodeName(socketPath).constData());
 
     if (::connect(sfd, (struct sockaddr *)&server, sl) == 0) {
         static const int msize = 21; // most digits in a 64bit int (+sign +'\0')
         char msg[msize];
         sprintf(msg, "%lld", debuggerpid);
 
         int r, bytes = 0;
         while (bytes < msize) {
             r = write(sfd, msg + bytes, msize - bytes);
             if (r > 0)
                 bytes += r;
             else if (r == -1 && errno != EINTR)
                 break;
         }
         if (bytes == msize) {
             struct pollfd fd;
             fd.fd = sfd;
             fd.events = POLLIN;
             while ((r = poll(&fd, 1, 1000)) == -1 && errno == EINTR) { }
             if (r > 0 && (fd.revents & POLLIN)) {
                 char rmsg[msize];
                 bytes = 0;
                 while (bytes < msize) {
                     r = read(sfd, rmsg + bytes, msize - bytes);
                     if (r > 0)
                         bytes += r;
                     else if (r == -1 && errno != EINTR)
                         break;
                 }
                 if (bytes == msize && memcmp(msg, rmsg, msize) == 0)
                     qCInfo(DRKONQI_LOG) << "ptracer set to" << debuggerpid << "by debugged process";
                 else
                     qCWarning(DRKONQI_LOG) << "debugged process did not acknowledge setting ptracer to" << debuggerpid;
                 close(sfd);
                 return;
             }
         }
     }
 
     qCWarning(DRKONQI_LOG) << "unable to set ptracer to" << debuggerpid;
     close(sfd);
 }
 
 #else
 
 void setPtracer(qint64, qint64)
 {
 }
 
 #endif