cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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qemu-openpty.c (3877B)

      1/*
      2 * qemu-openpty.c
      3 *
      4 * Copyright (c) 2003-2008 Fabrice Bellard
      5 * Copyright (c) 2010 Red Hat, Inc.
      6 *
      7 * Wrapper function qemu_openpty() implementation.
      8 *
      9 * Permission is hereby granted, free of charge, to any person obtaining a copy
     10 * of this software and associated documentation files (the "Software"), to deal
     11 * in the Software without restriction, including without limitation the rights
     12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     13 * copies of the Software, and to permit persons to whom the Software is
     14 * furnished to do so, subject to the following conditions:
     15 *
     16 * The above copyright notice and this permission notice shall be included in
     17 * all copies or substantial portions of the Software.
     18 *
     19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     25 * THE SOFTWARE.
     26 */
     27
     28/*
     29 * This is not part of oslib-posix.c because this function
     30 * uses openpty() which often in -lutil, and if we add this
     31 * dependency to oslib-posix.o, every app will have to be
     32 * linked with -lutil.
     33 */
     34
     35#include "qemu/osdep.h"
     36#include "qemu-common.h"
     37
     38#if defined HAVE_PTY_H
     39# include <pty.h>
     40#elif defined CONFIG_BSD
     41# include <termios.h>
     42# if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
     43#  include <libutil.h>
     44# else
     45#  include <util.h>
     46# endif
     47#elif defined CONFIG_SOLARIS
     48# include <termios.h>
     49# include <stropts.h>
     50#else
     51# include <termios.h>
     52#endif
     53
     54#ifdef __sun__
     55
     56#if !defined(HAVE_OPENPTY)
     57/* Once illumos has openpty(), this is going to be removed. */
     58static int openpty(int *amaster, int *aslave, char *name,
     59                   struct termios *termp, struct winsize *winp)
     60{
     61        const char *slave;
     62        int mfd = -1, sfd = -1;
     63
     64        *amaster = *aslave = -1;
     65
     66        mfd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
     67        if (mfd < 0)
     68                goto err;
     69
     70        if (grantpt(mfd) == -1 || unlockpt(mfd) == -1)
     71                goto err;
     72
     73        if ((slave = ptsname(mfd)) == NULL)
     74                goto err;
     75
     76        if ((sfd = open(slave, O_RDONLY | O_NOCTTY)) == -1)
     77                goto err;
     78
     79        if (ioctl(sfd, I_PUSH, "ptem") == -1 ||
     80            (termp != NULL && tcgetattr(sfd, termp) < 0))
     81                goto err;
     82
     83        *amaster = mfd;
     84        *aslave = sfd;
     85
     86        if (winp)
     87                ioctl(sfd, TIOCSWINSZ, winp);
     88
     89        return 0;
     90
     91err:
     92        if (sfd != -1)
     93                close(sfd);
     94        close(mfd);
     95        return -1;
     96}
     97#endif
     98
     99static void cfmakeraw (struct termios *termios_p)
    100{
    101        termios_p->c_iflag &=
    102                ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
    103        termios_p->c_oflag &= ~OPOST;
    104        termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
    105        termios_p->c_cflag &= ~(CSIZE|PARENB);
    106        termios_p->c_cflag |= CS8;
    107
    108        termios_p->c_cc[VMIN] = 0;
    109        termios_p->c_cc[VTIME] = 0;
    110}
    111#endif
    112
    113int qemu_openpty_raw(int *aslave, char *pty_name)
    114{
    115    int amaster;
    116    struct termios tty;
    117#if defined(__OpenBSD__) || defined(__DragonFly__)
    118    char pty_buf[PATH_MAX];
    119#define q_ptsname(x) pty_buf
    120#else
    121    char *pty_buf = NULL;
    122#define q_ptsname(x) ptsname(x)
    123#endif
    124
    125    if (openpty(&amaster, aslave, pty_buf, NULL, NULL) < 0) {
    126        return -1;
    127    }
    128
    129    /* Set raw attributes on the pty. */
    130    tcgetattr(*aslave, &tty);
    131    cfmakeraw(&tty);
    132    tcsetattr(*aslave, TCSAFLUSH, &tty);
    133
    134    if (pty_name) {
    135        strcpy(pty_name, q_ptsname(amaster));
    136    }
    137
    138    return amaster;
    139}