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Qrexec common code, qubes.Filecopy common code, udev scripts

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release2 mm_42e133b7
Marek Marczykowski 11 years ago
commit 42e133b753
29 changed files with 1637 additions and 0 deletions
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3
.gitignore vendored
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rpm/
*~
*.o

23
Makefile
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ifeq ($(shell uname -m),x86_64)
LIBDIR = /usr/lib64
else
LIBDIR = /usr/lib
endif
INCLUDEDIR = /usr/include
export LIBDIR INCLUDEDIR
help:
echo "Use rpmbuild to compile this pacakge"
exit 0
rpms:
rpmbuild --define "_rpmdir rpm/" --define "_builddir ." -bb rpm_spec/qubes-utils.spec
all:
$(MAKE) -C qrexec-lib all
install:
$(MAKE) -C udev install
$(MAKE) -C qrexec-lib install

1
Makefile.builder
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RPM_SPEC_FILES := rpm_spec/qubes-utils.spec

22
qrexec-lib/Makefile
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CC=gcc
CFLAGS+=-I. -g -Wall -pie -fPIC -Wall
COMMONIOALL=ioall.o
all: libqrexec-utils.a libqubes-rpc-filecopy.a
libqrexec-utils.a: unix-server.o ioall.o buffer.o write-stdin.o exec.o txrx-vchan.o
libqubes-rpc-filecopy.a: ioall.o copy-file.o crc32.o unpack.o
%.a:
$(AR) rcs $@ $^
clean:
rm -f *.o *~ *.a
install:
mkdir -p $(DESTDIR)$(LIBDIR)
cp libqrexec-utils.a $(DESTDIR)$(LIBDIR)
cp libqubes-rpc-filecopy.a $(DESTDIR)$(LIBDIR)
mkdir -p $(DESTDIR)$(INCLUDEDIR)
cp libqrexec-utils.h $(DESTDIR)$(INCLUDEDIR)
cp libqubes-rpc-filecopy.h $(DESTDIR)$(INCLUDEDIR)
cp qrexec.h $(DESTDIR)$(INCLUDEDIR)

99
qrexec-lib/buffer.c
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libqrexec-utils.h"
#define BUFFER_LIMIT 50000000
static int total_mem;
static char *limited_malloc(int len)
{
char *ret;
total_mem += len;
if (total_mem > BUFFER_LIMIT) {
fprintf(stderr, "attempt to allocate >BUFFER_LIMIT\n");
exit(1);
}
ret = malloc(len);
if (!ret) {
perror("malloc");
exit(1);
}
return ret;
}
static void limited_free(char *ptr, int len)
{
free(ptr);
total_mem -= len;
}
void buffer_init(struct buffer *b)
{
b->buflen = 0;
b->data = NULL;
}
void buffer_free(struct buffer *b)
{
if (b->buflen)
limited_free(b->data, b->buflen);
buffer_init(b);
}
/*
The following two functions can be made much more efficient.
Yet the profiling output show they are not significant CPU hogs, so
we keep them so simple to make them obviously correct.
*/
void buffer_append(struct buffer *b, char *data, int len)
{
int newsize = len + b->buflen;
char *qdata = limited_malloc(len + b->buflen);
memcpy(qdata, b->data, b->buflen);
memcpy(qdata + b->buflen, data, len);
buffer_free(b);
b->buflen = newsize;
b->data = qdata;
}
void buffer_remove(struct buffer *b, int len)
{
int newsize = b->buflen - len;
char *qdata = limited_malloc(newsize);
memcpy(qdata, b->data + len, newsize);
buffer_free(b);
b->buflen = newsize;
b->data = qdata;
}
int buffer_len(struct buffer *b)
{
return b->buflen;
}
void *buffer_data(struct buffer *b)
{
return b->data;
}

44
qrexec-lib/copy-file.c
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#include <unistd.h>
#include <ioall.h>
#include "filecopy.h"
#include "crc32.h"
extern void notify_progress(int, int);
int copy_file(int outfd, int infd, long long size, unsigned long *crc32)
{
char buf[4096];
long long written = 0;
int ret;
int count;
while (written < size) {
if (size - written > sizeof(buf))
count = sizeof buf;
else
count = size - written;
ret = read(infd, buf, count);
if (!ret)
return COPY_FILE_READ_EOF;
if (ret < 0)
return COPY_FILE_READ_ERROR;
/* acumulate crc32 if requested */
if (crc32)
*crc32 = Crc32_ComputeBuf(*crc32, buf, ret);
if (!write_all(outfd, buf, ret))
return COPY_FILE_WRITE_ERROR;
notify_progress(ret, 0);
written += ret;
}
return COPY_FILE_OK;
}
char * copy_file_status_to_str(int status)
{
switch (status) {
case COPY_FILE_OK: return "OK";
case COPY_FILE_READ_EOF: return "Unexpected end of data while reading";
case COPY_FILE_READ_ERROR: return "Error reading";
case COPY_FILE_WRITE_ERROR: return "Error writing";
default: return "????????";
}
}

146
qrexec-lib/crc32.c
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/*----------------------------------------------------------------------------*\
* CRC-32 version 2.0.0 by Craig Bruce, 2006-04-29.
*
* This program generates the CRC-32 values for the files named in the
* command-line arguments. These are the same CRC-32 values used by GZIP,
* PKZIP, and ZMODEM. The Crc32_ComputeBuf() can also be detached and
* used independently.
*
* THIS PROGRAM IS PUBLIC-DOMAIN SOFTWARE.
*
* Based on the byte-oriented implementation "File Verification Using CRC"
* by Mark R. Nelson in Dr. Dobb's Journal, May 1992, pp. 64-67.
*
* v1.0.0: original release.
* v1.0.1: fixed printf formats.
* v1.0.2: fixed something else.
* v1.0.3: replaced CRC constant table by generator function.
* v1.0.4: reformatted code, made ANSI C. 1994-12-05.
* v2.0.0: rewrote to use memory buffer & static table, 2006-04-29.
\*----------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
/*----------------------------------------------------------------------------*\
* Local functions
\*----------------------------------------------------------------------------*/
unsigned long Crc32_ComputeBuf( unsigned long inCrc32, const void *buf,
size_t bufLen );
/*----------------------------------------------------------------------------*\
* NAME:
* Crc32_ComputeFile() - compute CRC-32 value for a file
* DESCRIPTION:
* Computes the CRC-32 value for an opened file.
* ARGUMENTS:
* file - file pointer
* outCrc32 - (out) result CRC-32 value
* RETURNS:
* err - 0 on success or -1 on error
* ERRORS:
* - file errors
\*----------------------------------------------------------------------------*/
int Crc32_ComputeFile( FILE *file, unsigned long *outCrc32 )
{
# define CRC_BUFFER_SIZE 8192
unsigned char buf[CRC_BUFFER_SIZE];
size_t bufLen;
/** accumulate crc32 from file **/
*outCrc32 = 0;
while (1) {
bufLen = fread( buf, 1, CRC_BUFFER_SIZE, file );
if (bufLen == 0) {
if (ferror(file)) {
fprintf( stderr, "error reading file\n" );
goto ERR_EXIT;
}
break;
}
*outCrc32 = Crc32_ComputeBuf( *outCrc32, buf, bufLen );
}
return( 0 );
/** error exit **/
ERR_EXIT:
return( -1 );
}
/*----------------------------------------------------------------------------*\
* NAME:
* Crc32_ComputeBuf() - computes the CRC-32 value of a memory buffer
* DESCRIPTION:
* Computes or accumulates the CRC-32 value for a memory buffer.
* The 'inCrc32' gives a previously accumulated CRC-32 value to allow
* a CRC to be generated for multiple sequential buffer-fuls of data.
* The 'inCrc32' for the first buffer must be zero.
* ARGUMENTS:
* inCrc32 - accumulated CRC-32 value, must be 0 on first call
* buf - buffer to compute CRC-32 value for
* bufLen - number of bytes in buffer
* RETURNS:
* crc32 - computed CRC-32 value
* ERRORS:
* (no errors are possible)
\*----------------------------------------------------------------------------*/
unsigned long Crc32_ComputeBuf( unsigned long inCrc32, const void *buf,
size_t bufLen )
{
static const unsigned long crcTable[256] = {
0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,0x706AF48F,0xE963A535,
0x9E6495A3,0x0EDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x09B64C2B,0x7EB17CBD,
0xE7B82D07,0x90BF1D91,0x1DB71064,0x6AB020F2,0xF3B97148,0x84BE41DE,0x1ADAD47D,
0x6DDDE4EB,0xF4D4B551,0x83D385C7,0x136C9856,0x646BA8C0,0xFD62F97A,0x8A65C9EC,
0x14015C4F,0x63066CD9,0xFA0F3D63,0x8D080DF5,0x3B6E20C8,0x4C69105E,0xD56041E4,
0xA2677172,0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,0x35B5A8FA,0x42B2986C,
0xDBBBC9D6,0xACBCF940,0x32D86CE3,0x45DF5C75,0xDCD60DCF,0xABD13D59,0x26D930AC,
0x51DE003A,0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,0xCFBA9599,0xB8BDA50F,
0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,0x2F6F7C87,0x58684C11,0xC1611DAB,
0xB6662D3D,0x76DC4190,0x01DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F,
0x9FBFE4A5,0xE8B8D433,0x7807C9A2,0x0F00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB,
0x086D3D2D,0x91646C97,0xE6635C01,0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E,
0x6C0695ED,0x1B01A57B,0x8208F4C1,0xF50FC457,0x65B0D9C6,0x12B7E950,0x8BBEB8EA,
0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,0xFBD44C65,0x4DB26158,0x3AB551CE,
0xA3BC0074,0xD4BB30E2,0x4ADFA541,0x3DD895D7,0xA4D1C46D,0xD3D6F4FB,0x4369E96A,
0x346ED9FC,0xAD678846,0xDA60B8D0,0x44042D73,0x33031DE5,0xAA0A4C5F,0xDD0D7CC9,
0x5005713C,0x270241AA,0xBE0B1010,0xC90C2086,0x5768B525,0x206F85B3,0xB966D409,
0xCE61E49F,0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,0x2EB40D81,
0xB7BD5C3B,0xC0BA6CAD,0xEDB88320,0x9ABFB3B6,0x03B6E20C,0x74B1D29A,0xEAD54739,
0x9DD277AF,0x04DB2615,0x73DC1683,0xE3630B12,0x94643B84,0x0D6D6A3E,0x7A6A5AA8,
0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,0xF00F9344,0x8708A3D2,0x1E01F268,
0x6906C2FE,0xF762575D,0x806567CB,0x196C3671,0x6E6B06E7,0xFED41B76,0x89D32BE0,
0x10DA7A5A,0x67DD4ACC,0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,0xD6D6A3E8,
0xA1D1937E,0x38D8C2C4,0x4FDFF252,0xD1BB67F1,0xA6BC5767,0x3FB506DD,0x48B2364B,
0xD80D2BDA,0xAF0A1B4C,0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,0x316E8EEF,
0x4669BE79,0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,0xCC0C7795,0xBB0B4703,
0x220216B9,0x5505262F,0xC5BA3BBE,0xB2BD0B28,0x2BB45A92,0x5CB36A04,0xC2D7FFA7,
0xB5D0CF31,0x2CD99E8B,0x5BDEAE1D,0x9B64C2B0,0xEC63F226,0x756AA39C,0x026D930A,
0x9C0906A9,0xEB0E363F,0x72076785,0x05005713,0x95BF4A82,0xE2B87A14,0x7BB12BAE,
0x0CB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,0x86D3D2D4,0xF1D4E242,
0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,0x18B74777,0x88085AE6,
0xFF0F6A70,0x66063BCA,0x11010B5C,0x8F659EFF,0xF862AE69,0x616BFFD3,0x166CCF45,
0xA00AE278,0xD70DD2EE,0x4E048354,0x3903B3C2,0xA7672661,0xD06016F7,0x4969474D,
0x3E6E77DB,0xAED16A4A,0xD9D65ADC,0x40DF0B66,0x37D83BF0,0xA9BCAE53,0xDEBB9EC5,
0x47B2CF7F,0x30B5FFE9,0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605,
0xCDD70693,0x54DE5729,0x23D967BF,0xB3667A2E,0xC4614AB8,0x5D681B02,0x2A6F2B94,
0xB40BBE37,0xC30C8EA1,0x5A05DF1B,0x2D02EF8D };
unsigned long crc32;
unsigned char *byteBuf;
size_t i;
/** accumulate crc32 for buffer **/
crc32 = inCrc32 ^ 0xFFFFFFFF;
byteBuf = (unsigned char*) buf;
for (i=0; i < bufLen; i++) {
crc32 = (crc32 >> 8) ^ crcTable[ (crc32 ^ byteBuf[i]) & 0xFF ];
}
return( crc32 ^ 0xFFFFFFFF );
}
/*----------------------------------------------------------------------------*\
* END OF MODULE: crc32.c
\*----------------------------------------------------------------------------*/

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qrexec-lib/crc32.h
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#ifndef _CRC32_H
#define _CRC32_H
extern unsigned long Crc32_ComputeBuf( unsigned long inCrc32, const void *buf,
size_t bufLen );
#endif /* _CRC32_H */

74
qrexec-lib/exec.c
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
extern void do_exec(char *);
void fix_fds(int fdin, int fdout, int fderr)
{
int i;
for (i = 0; i < 256; i++)
if (i != fdin && i != fdout && i != fderr)
close(i);
dup2(fdin, 0);
dup2(fdout, 1);
dup2(fderr, 2);
close(fdin);
close(fdout);
if (fderr != 2)
close(fderr);
}
void do_fork_exec(char *cmdline, int *pid, int *stdin_fd, int *stdout_fd,
int *stderr_fd)
{
int inpipe[2], outpipe[2], errpipe[2];
if (pipe(inpipe) || pipe(outpipe) || (stderr_fd && pipe(errpipe))) {
perror("pipe");
exit(1);
}
switch (*pid = fork()) {
case -1:
perror("fork");
exit(-1);
case 0:
if (stderr_fd) {
fix_fds(inpipe[0], outpipe[1], errpipe[1]);
} else
fix_fds(inpipe[0], outpipe[1], 2);
do_exec(cmdline);
exit(-1);
default:;
}
close(inpipe[0]);
close(outpipe[1]);
*stdin_fd = inpipe[1];
*stdout_fd = outpipe[0];
if (stderr_fd) {
close(errpipe[1]);
*stderr_fd = errpipe[0];
}
}

32
qrexec-lib/filecopy.h
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#define FILECOPY_SPOOL "/home/user/.filecopyspool"
#define FILECOPY_VMNAME_SIZE 32
#define PROGRESS_NOTIFY_DELTA (15*1000*1000)
#define MAX_PATH_LENGTH 16384
#define LEGAL_EOF 31415926
struct file_header {
unsigned int namelen;
unsigned int mode;
unsigned long long filelen;
unsigned int atime;
unsigned int atime_nsec;
unsigned int mtime;
unsigned int mtime_nsec;
};
struct result_header {
unsigned int error_code;
unsigned long crc32;
};
enum {
COPY_FILE_OK,
COPY_FILE_READ_EOF,
COPY_FILE_READ_ERROR,
COPY_FILE_WRITE_ERROR
};
int copy_file(int outfd, int infd, long long size, unsigned long *crc32);
char *copy_file_status_to_str(int status);
void set_size_limit(long long new_bytes_limit, long long new_files_limit);

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qrexec-lib/ioall.c
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
void perror_wrapper(char * msg)
{
int prev=errno;
perror(msg);
errno=prev;
}
void set_nonblock(int fd)
{
int fl = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, fl | O_NONBLOCK);
}
void set_block(int fd)
{
int fl = fcntl(fd, F_GETFL, 0);
fcntl(fd, F_SETFL, fl & ~O_NONBLOCK);
}
int write_all(int fd, void *buf, int size)
{
int written = 0;
int ret;
while (written < size) {
ret = write(fd, (char *) buf + written, size - written);
if (ret == -1 && errno == EINTR)
continue;
if (ret <= 0) {
return 0;
}
written += ret;
}
// fprintf(stderr, "sent %d bytes\n", size);
return 1;
}
int read_all(int fd, void *buf, int size)
{
int got_read = 0;
int ret;
while (got_read < size) {
ret = read(fd, (char *) buf + got_read, size - got_read);
if (ret == -1 && errno == EINTR)
continue;
if (ret == 0) {
errno = 0;
fprintf(stderr, "EOF\n");
return 0;
}
if (ret < 0) {
if (errno != EAGAIN)
perror_wrapper("read");
return 0;
}
if (got_read == 0) {
// force blocking operation on further reads
set_block(fd);
}
got_read += ret;
}
// fprintf(stderr, "read %d bytes\n", size);
return 1;
}
int copy_fd_all(int fdout, int fdin)
{
int ret;
char buf[4096];
for (;;) {
ret = read(fdin, buf, sizeof(buf));
if (ret == -1 && errno == EINTR)
continue;
if (!ret)
break;
if (ret < 0) {
perror_wrapper("read");
return 0;
}
if (!write_all(fdout, buf, ret)) {
perror_wrapper("write");
return 0;
}
}
return 1;
}

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qrexec-lib/ioall.h
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int write_all(int fd, void *buf, int size);
int read_all(int fd, void *buf, int size);
int copy_fd_all(int fdout, int fdin);
void set_nonblock(int fd);
void set_block(int fd);

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qrexec-lib/libqrexec-utils.h
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
* Copyright (C) 2013 Marek Marczykowski <marmarek@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <sys/select.h>
struct buffer {
char *data;
int buflen;
};
void buffer_init(struct buffer *b);
void buffer_free(struct buffer *b);
void buffer_append(struct buffer *b, char *data, int len);
void buffer_remove(struct buffer *b, int len);
int buffer_len(struct buffer *b);
void *buffer_data(struct buffer *b);
void do_fork_exec(char *cmdline, int *pid, int *stdin_fd, int *stdout_fd,
int *stderr_fd);
int peer_server_init(int port);
char *peer_client_init(int dom, int port);
void wait_for_vchan_or_argfd(int max, fd_set * rdset, fd_set * wrset);
int read_ready_vchan_ext();
int read_all(int fd, void *buf, int size);
int read_all_vchan_ext(void *buf, int size);
int write_all(int fd, void *buf, int size);
int write_all_vchan_ext(void *buf, int size);
int buffer_space_vchan_ext();
void fix_fds(int fdin, int fdout, int fderr);
void set_nonblock(int fd);
void set_block(int fd);
int get_server_socket(char *);
int do_accept(int s);
enum {
WRITE_STDIN_OK = 0x200,
WRITE_STDIN_BUFFERED,
WRITE_STDIN_ERROR
};
int flush_client_data(int fd, int client_id, struct buffer *buffer);
int write_stdin(int fd, int client_id, char *data, int len,
struct buffer *buffer);
void set_nonblock(int fd);
int fork_and_flush_stdin(int fd, struct buffer *buffer);

68
qrexec-lib/libqubes-rpc-filecopy.h
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
* Copyright (C) 2013 Marek Marczykowski <marmarek@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef _LIBQUBES_RPC_FILECOPY_H
#define _LIBQUBES_RPC_FILECOPY_H
#define FILECOPY_VMNAME_SIZE 32
#define PROGRESS_NOTIFY_DELTA (15*1000*1000)
#define MAX_PATH_LENGTH 16384
#define LEGAL_EOF 31415926
struct file_header {
unsigned int namelen;
unsigned int mode;
unsigned long long filelen;
unsigned int atime;
unsigned int atime_nsec;
unsigned int mtime;
unsigned int mtime_nsec;
};
struct result_header {
unsigned int error_code;
unsigned long crc32;
};
enum {
COPY_FILE_OK,
COPY_FILE_READ_EOF,
COPY_FILE_READ_ERROR,
COPY_FILE_WRITE_ERROR
};
int copy_file(int outfd, int infd, long long size, unsigned long *crc32);
char *copy_file_status_to_str(int status);
void set_size_limit(long long new_bytes_limit, long long new_files_limit);
int write_all(int fd, void *buf, int size);
int read_all(int fd, void *buf, int size);
int copy_fd_all(int fdout, int fdin);
void set_nonblock(int fd);
void set_block(int fd);
extern unsigned long Crc32_ComputeBuf( unsigned long inCrc32, const void *buf,
size_t bufLen );
extern int do_unpack();
#endif /* _LIBQUBES_RPC_FILECOPY_H */

106
qrexec-lib/qrexec.h
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/* See also http://wiki.qubes-os.org/trac/wiki/Qrexec */
#define QREXEC_DAEMON_SOCKET_DIR "/var/run/qubes"
#define MAX_FDS 256
#define MAX_DATA_CHUNK 4096
#define REXEC_PORT 512
#define QREXEC_AGENT_TRIGGER_PATH "/var/run/qubes/qrexec-agent"
#define QREXEC_AGENT_FDPASS_PATH "/var/run/qubes/qrexec-agent-fdpass"
#define MEMINFO_WRITER_PIDFILE "/var/run/meminfo-writer.pid"
#define QUBES_RPC_MULTIPLEXER_PATH "/usr/lib/qubes/qubes-rpc-multiplexer"
#define QUBES_RPC_MAGIC_CMD "QUBESRPC"
enum {
/* messages from qrexec_client to qrexec_daemon (both in dom0) */
/* start process in VM and pass its stdin/out/err to dom0 */
MSG_CLIENT_TO_SERVER_EXEC_CMDLINE = 0x100,
/* start process in VM discarding its stdin/out/err (connect to /dev/null) */
MSG_CLIENT_TO_SERVER_JUST_EXEC,
/* connect to existing process in VM to receive its stdin/out/err
* struct connect_existing_params passed as data */
MSG_CLIENT_TO_SERVER_CONNECT_EXISTING,
/* messages qrexec_daemon(dom0)->qrexec_agent(VM) */
/* same as MSG_CLIENT_TO_SERVER_CONNECT_EXISTING */
MSG_SERVER_TO_AGENT_CONNECT_EXISTING,
/* same as MSG_CLIENT_TO_SERVER_EXEC_CMDLINE */
MSG_SERVER_TO_AGENT_EXEC_CMDLINE,
/* same as MSG_CLIENT_TO_SERVER_JUST_EXEC */
MSG_SERVER_TO_AGENT_JUST_EXEC,
/* pass data to process stdin */
MSG_SERVER_TO_AGENT_INPUT,
/* detach from process; qrexec_agent should close pipes to process
* stdin/out/err; it's up to the VM child process if it cause its termination */
MSG_SERVER_TO_AGENT_CLIENT_END,
/* flow control, qrexec_daemon->qrexec_agent */
/* suspend reading of named fd from child process */
MSG_XOFF,
/* resume reading of named fd from child process */
MSG_XON,
/* messages qrexec_agent(VM)->qrexec_daemon(dom0) */
/* pass data from process stdout */
MSG_AGENT_TO_SERVER_STDOUT,
/* pass data from process stderr */
MSG_AGENT_TO_SERVER_STDERR,
/* inform that process terminated and pass its exit code; this should be
* send after all data from stdout/err are send */
MSG_AGENT_TO_SERVER_EXIT_CODE,
/* call Qubes RPC service
* struct trigger_connect_params passed as data */
MSG_AGENT_TO_SERVER_TRIGGER_CONNECT_EXISTING,
/* messages qrexec_daemon->qrexec_client (both in dom0) */
/* same as MSG_AGENT_TO_SERVER_STDOUT */
MSG_SERVER_TO_CLIENT_STDOUT,
/* same as MSG_AGENT_TO_SERVER_STDERR */
MSG_SERVER_TO_CLIENT_STDERR,
/* same as MSG_AGENT_TO_SERVER_EXIT_CODE */
MSG_SERVER_TO_CLIENT_EXIT_CODE
};
struct server_header {
unsigned int type;
unsigned int client_id;
unsigned int len;
};
struct client_header {
unsigned int type;
unsigned int len;
};
struct connect_existing_params {
char ident[32];
};
struct trigger_connect_params {
char exec_index[64];
char target_vmname[32];
struct connect_existing_params process_fds;
};

221
qrexec-lib/txrx-vchan.c
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <libvchan.h>
#include <xs.h>
#include <xenctrl.h>
static struct libvchan *ctrl;
static int is_server;
int write_all_vchan_ext(void *buf, int size)
{
int written = 0;
int ret;
while (written < size) {
ret =
libvchan_write(ctrl, (char *) buf + written,
size - written);
if (ret <= 0) {
perror("write");
exit(1);
}
written += ret;
}
// fprintf(stderr, "sent %d bytes\n", size);
return size;
}
int read_all_vchan_ext(void *buf, int size)
{
int written = 0;
int ret;
while (written < size) {
ret =
libvchan_read(ctrl, (char *) buf + written,
size - written);
if (ret == 0) {
fprintf(stderr, "EOF\n");
exit(1);
}
if (ret < 0) {
perror("read");
exit(1);
}
written += ret;
}
// fprintf(stderr, "read %d bytes\n", size);
return size;
}
int read_ready_vchan_ext()
{
return libvchan_data_ready(ctrl);
}
int buffer_space_vchan_ext()
{
return libvchan_buffer_space(ctrl);
}
// if the remote domain is destroyed, we get no notification
// thus, we check for the status periodically
#ifdef XENCTRL_HAS_XC_INTERFACE
static xc_interface *xc_handle = NULL;
#else
static int xc_handle = -1;
#endif
void slow_check_for_libvchan_is_eof(struct libvchan *ctrl)
{
struct evtchn_status evst;
evst.port = ctrl->evport;
evst.dom = DOMID_SELF;
if (xc_evtchn_status(xc_handle, &evst)) {
perror("xc_evtchn_status");
exit(1);
}
if (evst.status != EVTCHNSTAT_interdomain) {
fprintf(stderr, "event channel disconnected\n");
exit(0);
}
}
int wait_for_vchan_or_argfd_once(int max, fd_set * rdset, fd_set * wrset)
{
int vfd, ret;
struct timespec tv = { 1, 100000000 };
sigset_t empty_set;
sigemptyset(&empty_set);
vfd = libvchan_fd_for_select(ctrl);
FD_SET(vfd, rdset);
if (vfd > max)
max = vfd;
max++;
ret = pselect(max, rdset, wrset, NULL, &tv, &empty_set);
if (ret < 0) {
if (errno != EINTR) {
perror("select");
exit(1);
} else {
FD_ZERO(rdset);
FD_ZERO(wrset);
fprintf(stderr, "eintr\n");
return 1;
}
}
if (libvchan_is_eof(ctrl)) {
fprintf(stderr, "libvchan_is_eof\n");
exit(0);
}
if (!is_server && ret == 0)
slow_check_for_libvchan_is_eof(ctrl);
if (FD_ISSET(vfd, rdset))
// the following will never block; we need to do this to
// clear libvchan_fd pending state
libvchan_wait(ctrl);
return ret;
}
void wait_for_vchan_or_argfd(int max, fd_set * rdset, fd_set * wrset)
{
fd_set r = *rdset, w = *wrset;
do {
*rdset = r;
*wrset = w;
}
while (wait_for_vchan_or_argfd_once(max, rdset, wrset) == 0);
}
int peer_server_init(int port)
{
is_server = 1;
ctrl = libvchan_server_init(port);
if (!ctrl) {
perror("libvchan_server_init");
exit(1);
}
return 0;
}
char *peer_client_init(int dom, int port)
{
struct xs_handle *xs;
char buf[64];
char *name;
char *dummy;
unsigned int len = 0;
char devbuf[128];
unsigned int count;
char **vec;
// double_buffered = 1; // writes to vchan are buffered, nonblocking
// double_buffer_init();
xs = xs_daemon_open();
if (!xs) {
perror("xs_daemon_open");
exit(1);
}
snprintf(buf, sizeof(buf), "/local/domain/%d/name", dom);
name = xs_read(xs, 0, buf, &len);
if (!name) {
perror("xs_read domainname");
exit(1);
}
snprintf(devbuf, sizeof(devbuf),
"/local/domain/%d/device/vchan/%d/event-channel", dom,
port);
xs_watch(xs, devbuf, devbuf);
do {
vec = xs_read_watch(xs, &count);
if (vec)
free(vec);
len = 0;
dummy = xs_read(xs, 0, devbuf, &len);
}
while (!dummy || !len); // wait for the server to create xenstore entries
free(dummy);
xs_daemon_close(xs);
// now client init should succeed; "while" is redundant
while (!(ctrl = libvchan_client_init(dom, port)));
#ifdef XENCTRL_HAS_XC_INTERFACE
xc_handle = xc_interface_open(NULL, 0, 0);
if (!xc_handle) {
#else
xc_handle = xc_interface_open();
if (xc_handle < 0) {
#endif
perror("xc_interface_open");
exit(1);
}
return name;
}

68
qrexec-lib/unix-server.c
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
//#include "qrexec.h"
int get_server_socket(char *socket_address)
{
struct sockaddr_un sockname;
int s;
unlink(socket_address);
s = socket(AF_UNIX, SOCK_STREAM, 0);
memset(&sockname, 0, sizeof(sockname));
sockname.sun_family = AF_UNIX;
memcpy(sockname.sun_path, socket_address, strlen(socket_address));
if (bind(s, (struct sockaddr *) &sockname, sizeof(sockname)) == -1) {
printf("bind() failed\n");
close(s);
exit(1);
}
// chmod(sockname.sun_path, 0666);
if (listen(s, 5) == -1) {
perror("listen() failed\n");
close(s);
exit(1);
}
return s;
}
int do_accept(int s)
{
struct sockaddr_un peer;
unsigned int addrlen;
int fd;
addrlen = sizeof(peer);
fd = accept(s, (struct sockaddr *) &peer, &addrlen);
if (fd == -1) {
perror("unix accept");
exit(1);
}
return fd;
}

157
qrexec-lib/unpack.c
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#define _GNU_SOURCE /* For O_NOFOLLOW. */
#include <errno.h>
#include <ioall.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include "filecopy.h"
#include "crc32.h"
char untrusted_namebuf[MAX_PATH_LENGTH];
long long bytes_limit = 0;
long long files_limit = 0;
long long total_bytes = 0;
long long total_files = 0;
void set_size_limit(long long new_bytes_limit, long long new_files_limit)
{
bytes_limit = new_bytes_limit;
files_limit = new_files_limit;
}
unsigned long crc32_sum = 0;
int read_all_with_crc(int fd, void *buf, int size) {
int ret;
ret = read_all(fd, buf, size);
if (ret)
crc32_sum = Crc32_ComputeBuf(crc32_sum, buf, size);
return ret;
}
void send_status_and_crc(int code) {
struct result_header hdr;
int saved_errno;
saved_errno = errno;
hdr.error_code = code;
hdr.crc32 = crc32_sum;
if (!write_all(1, &hdr, sizeof(hdr)))
perror("write status");
errno = saved_errno;
}
void do_exit(int code)
{
close(0);
send_status_and_crc(code);
exit(code);
}
void fix_times_and_perms(struct file_header *untrusted_hdr,
char *untrusted_name)
{
struct timeval times[2] =
{ {untrusted_hdr->atime, untrusted_hdr->atime_nsec / 1000},
{untrusted_hdr->mtime,
untrusted_hdr->mtime_nsec / 1000}
};
if (chmod(untrusted_name, untrusted_hdr->mode & 07777)) /* safe because of chroot */
do_exit(errno);
if (utimes(untrusted_name, times)) /* as above */
do_exit(errno);
}
void process_one_file_reg(struct file_header *untrusted_hdr,
char *untrusted_name)
{
int ret;
int fdout = open(untrusted_name, O_WRONLY | O_CREAT | O_EXCL | O_NOFOLLOW, 0700); /* safe because of chroot */
if (fdout < 0)
do_exit(errno);
total_bytes += untrusted_hdr->filelen;
if (bytes_limit && total_bytes > bytes_limit)
do_exit(EDQUOT);
ret = copy_file(fdout, 0, untrusted_hdr->filelen, &crc32_sum);
if (ret != COPY_FILE_OK) {
if (ret == COPY_FILE_READ_EOF
|| ret == COPY_FILE_READ_ERROR)
do_exit(LEGAL_EOF); // hopefully remote will produce error message
else
do_exit(errno);
}
close(fdout);
fix_times_and_perms(untrusted_hdr, untrusted_name);
}
void process_one_file_dir(struct file_header *untrusted_hdr,
char *untrusted_name)
{
// fix perms only when the directory is sent for the second time
// it allows to transfer r.x directory contents, as we create it rwx initially
if (!mkdir(untrusted_name, 0700)) /* safe because of chroot */
return;
if (errno != EEXIST)
do_exit(errno);
fix_times_and_perms(untrusted_hdr, untrusted_name);
}
void process_one_file_link(struct file_header *untrusted_hdr,
char *untrusted_name)
{
char untrusted_content[MAX_PATH_LENGTH];
unsigned int filelen;
if (untrusted_hdr->filelen > MAX_PATH_LENGTH - 1)
do_exit(ENAMETOOLONG);
filelen = untrusted_hdr->filelen; /* sanitized above */
if (!read_all_with_crc(0, untrusted_content, filelen))
do_exit(LEGAL_EOF); // hopefully remote has produced error message
untrusted_content[filelen] = 0;
if (symlink(untrusted_content, untrusted_name)) /* safe because of chroot */
do_exit(errno);
}
void process_one_file(struct file_header *untrusted_hdr)
{
unsigned int namelen;
if (untrusted_hdr->namelen > MAX_PATH_LENGTH - 1)
do_exit(ENAMETOOLONG);
namelen = untrusted_hdr->namelen; /* sanitized above */
if (!read_all_with_crc(0, untrusted_namebuf, namelen))
do_exit(LEGAL_EOF); // hopefully remote has produced error message
untrusted_namebuf[namelen] = 0;
if (S_ISREG(untrusted_hdr->mode))
process_one_file_reg(untrusted_hdr, untrusted_namebuf);
else if (S_ISLNK(untrusted_hdr->mode))
process_one_file_link(untrusted_hdr, untrusted_namebuf);
else if (S_ISDIR(untrusted_hdr->mode))
process_one_file_dir(untrusted_hdr, untrusted_namebuf);
else
do_exit(EINVAL);
}
int do_unpack()
{
struct file_header untrusted_hdr;
/* initialize checksum */
crc32_sum = 0;
while (read_all_with_crc(0, &untrusted_hdr, sizeof untrusted_hdr)) {
/* check for end of transfer marker */
if (untrusted_hdr.namelen == 0) {
errno = 0;
break;
}
process_one_file(&untrusted_hdr);
total_files++;
if (files_limit && total_files > files_limit)
do_exit(EDQUOT);
}
send_status_and_crc(errno);
return errno;
}

135
qrexec-lib/write-stdin.c
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/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include "qrexec.h"
#include "libqrexec-utils.h"
/*
There is buffered data in "buffer" for client id "client_id", and select()
reports that "fd" is writable. Write as much as possible to fd, if all sent,
notify the peer that this client's pipe is no longer full.
*/
int flush_client_data(int fd, int client_id, struct buffer *buffer)
{
int ret;
int len;
for (;;) {
len = buffer_len(buffer);
if (len > MAX_DATA_CHUNK)
len = MAX_DATA_CHUNK;
ret = write(fd, buffer_data(buffer), len);
if (ret == -1) {
if (errno != EAGAIN) {
return WRITE_STDIN_ERROR;
} else
return WRITE_STDIN_BUFFERED;
}
// we previously called buffer_remove(buffer, len)
// it will be wrong if we change MAX_DATA_CHUNK to something large
// as pipes writes are atomic only to PIPE_MAX limit
buffer_remove(buffer, ret);
len = buffer_len(buffer);
if (!len) {
struct server_header s_hdr;
s_hdr.type = MSG_XON;
s_hdr.client_id = client_id;
s_hdr.len = 0;
write_all_vchan_ext(&s_hdr, sizeof s_hdr);
return WRITE_STDIN_OK;
}
}
}
/*
Write "len" bytes from "data" to "fd". If not all written, buffer the rest
to "buffer", and notify the peer that the client "client_id" pipe is full via
MSG_XOFF message.
*/
int write_stdin(int fd, int client_id, char *data, int len,
struct buffer *buffer)
{
int ret;
int written = 0;
if (buffer_len(buffer)) {
buffer_append(buffer, data, len);
return WRITE_STDIN_BUFFERED;
}
while (written < len) {
ret = write(fd, data + written, len - written);
if (ret == 0) {
perror("write_stdin: write returns 0 ???");
exit(1);
}
if (ret == -1) {
struct server_header s_hdr;
if (errno != EAGAIN)
return WRITE_STDIN_ERROR;
buffer_append(buffer, data + written,
len - written);
s_hdr.type = MSG_XOFF;
s_hdr.client_id = client_id;
s_hdr.len = 0;
write_all_vchan_ext(&s_hdr, sizeof s_hdr);
return WRITE_STDIN_BUFFERED;
}
written += ret;
}
return WRITE_STDIN_OK;
}
/*
Data feed process has exited, so we need to clear all control structures for
the client. However, if we have buffered data for the client (which is rare btw),
fire&forget a separate process to flush them.
*/
int fork_and_flush_stdin(int fd, struct buffer *buffer)
{
int i;
if (!buffer_len(buffer))
return 0;
switch (fork()) {
case -1:
perror("fork");
exit(1);
case 0:
break;
default:
return 1;
}
for (i = 0; i < MAX_FDS; i++)
if (i != fd && i != 2)
close(i);
set_block(fd);
write_all(fd, buffer_data(buffer), buffer_len(buffer));
exit(0);
}

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rpm_spec/qubes-utils.spec
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%define version %(cat version)
%if 0%{?qubes_builder}
%define _builddir %(pwd)
%endif
Name: qubes-utils
Version: %{version}
Release: 1%{?dist}
Summary: Common Linux files for Qubes Dom0 and VM
Group: Qubes
License: GPL
URL: http://www.qubes-os.org
Requires: udev
%description
Common Linux files for Qubes Dom0 and VM
%package devel
Summary: Development headers for qubes-utils
Release: 1%{?dist}
%description devel
Development header and files for qubes-utils
%prep
%build
make all
%install
make install DESTDIR=%{buildroot}
%clean
rm -rf $RPM_BUILD_ROOT
%files
%defattr(-,root,root,-)
/etc/udev/rules.d/99-qubes-*.rules
/usr/libexec/qubes/udev-*
%files devel
%defattr(-,root,root,-)
/usr/include/libqrexec-utils.h
/usr/include/libqubes-rpc-filecopy.h
/usr/include/qrexec.h
%{_libdir}/libqrexec-utils.a
%{_libdir}/libqubes-rpc-filecopy.a
%changelog

13
udev/Makefile
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all:
install:
mkdir -p $(DESTDIR)/etc/udev/rules.d
cp udev-qubes-block.rules $(DESTDIR)/etc/udev/rules.d/99-qubes-block.rules
cp udev-qubes-usb.rules $(DESTDIR)/etc/udev/rules.d/99-qubes-usb.rules
mkdir -p $(DESTDIR)/usr/libexec/qubes
cp udev-block-add-change $(DESTDIR)/usr/libexec/qubes/
cp udev-block-remove $(DESTDIR)/usr/libexec/qubes/
cp udev-block-cleanup $(DESTDIR)/usr/libexec/qubes/
cp udev-usb-add-change $(DESTDIR)/usr/libexec/qubes/
cp udev-usb-remove $(DESTDIR)/usr/libexec/qubes/

61
udev/udev-block-add-change
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#!/bin/bash
NAME=${DEVNAME#/dev/}
DESC="${ID_MODEL} (${ID_FS_LABEL})"
SIZE=$[ $(cat /sys/$DEVPATH/size) * 512 ]
MODE=w
XS_KEY="qubes-block-devices/$NAME"
xs_remove() {
if [ "$QUBES_EXPOSED" == "1" ]; then
xenstore-rm "$XS_KEY"
fi
echo QUBES_EXPOSED=0
}
# Ignore mounted...
if fgrep -q $DEVNAME /proc/mounts; then
xs_remove
exit 0
fi
# ... and used by device-mapper
if [ -n "`ls -A /sys/$DEVPATH/holders 2> /dev/null`" ]; then
xs_remove
exit 0
fi
# ... and "empty" loop devices
if [ "$MAJOR" -eq 7 -a ! -d /sys/$DEVPATH/loop ]; then
xs_remove
exit 0
fi
# Special case for CD
if [ "$ID_TYPE" = "cd" ]; then
if [ "$ID_CDROM_MEDIA" != "1" ]; then
# Hide empty cdrom drive
xs_remove
exit 0
fi
MODE=r
fi
# Special description for loop devices
if [ -d /sys/$DEVPATH/loop ]; then
DESC=$(cat /sys/$DEVPATH/loop/backing_file)
fi
# Get lock only in dom0 - there are so many block devices so it causes xenstore
# deadlocks sometimes.
if [ -f /etc/qubes-release ]; then
# Skip xenstore-write if cannot obtain lock. This can mean very early system startup
# stage without /run mounted (or populated). Devices will be rediscovered later
# by qubes-core startup script.
exec 9>>/var/run/qubes/block-xenstore.lock || exit 0
flock 9
fi
xenstore-write "$XS_KEY/desc" "$DESC" "$XS_KEY/size" "$SIZE" "$XS_KEY/mode" "$MODE"
echo QUBES_EXPOSED=1
# Make sure that block backend is loaded
/sbin/modprobe xen-blkback 2> /dev/null || /sbin/modprobe blkbk

8
udev/udev-block-cleanup
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#!/bin/sh
DEVID=$[ $MAJOR * 256 + $MINOR ]
XS_PATH="device/vbd/$DEVID"
# Double check that DEVID is not empty
[ -n "$DEVID" ] && xenstore-rm $XS_PATH

32
udev/udev-block-remove
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#!/bin/sh
NAME=${DEVNAME#/dev/}
XS_KEY="qubes-block-devices/$NAME"
xenstore-rm "$XS_KEY"
# If device was connected to some VM - detach it
# Notice: this can be run also in VM, so we cannot use xl...
device_detach() {
xs_path=$1
xenstore-write $xs_path/online 0 $xs_path/state 5
# Wait for backend to finish dev shutdown
try=30
# -lt will break loop also when 'state' will be empty
while [ "`xenstore-read $xs_path/state 2> /dev/null`" -lt 6 ]; do
try=$[ $try - 1 ]
[ "$try" -le 0 ] && break
sleep 0.1
done
xenstore-rm $xs_path
}
for XS_DEV_PATH in `xenstore-ls -f backend/vbd | grep 'backend/vbd/[0-9]*/[0-9]* ' | cut -f 1 -d ' '`; do
CUR_DEVICE=`xenstore-read "$XS_DEV_PATH/params"`
if [ "$CUR_DEVICE" == "$DEVNAME" ]; then
device_detach "$XS_DEV_PATH"
exit 0
fi
done

20
udev/udev-qubes-block.rules
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# Expose all (except xen-frontend) block devices via xenstore
# Only block devices are interesting
SUBSYSTEM!="block", GOTO="qubes_block_end"
# Skip xen-blkfront devices
ENV{MAJOR}=="202", GOTO="qubes_block_end"
# Skip device-mapper devices
ENV{MAJOR}=="253", GOTO="qubes_block_end"
IMPORT{db}="QUBES_EXPOSED"
ACTION=="add", IMPORT{program}="/usr/libexec/qubes/udev-block-add-change"
ACTION=="change", IMPORT{program}="/usr/libexec/qubes/udev-block-add-change"
ACTION=="remove", RUN+="/usr/libexec/qubes/udev-block-remove"
LABEL="qubes_block_end"
# Cleanup disconnected frontend from xenstore
ACTION=="remove", SUBSYSTEM=="block", ENV{MAJOR}=="202", RUN+="/usr/libexec/qubes/udev-block-cleanup"

10
udev/udev-qubes-usb.rules
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# Expose all USB devices (except block) via xenstore
# Handle only USB devices
SUBSYSTEM!="usb", GOTO="qubes_usb_end"
ACTION=="add", IMPORT{program}="/usr/libexec/qubes/udev-usb-add-change"
ACTION=="change", IMPORT{program}="/usr/libexec/qubes/udev-usb-add-change"
ACTION=="remove", RUN+="/usr/libexec/qubes/udev-usb-remove"
LABEL="qubes_usb_end"

40
udev/udev-usb-add-change
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#!/bin/sh
##
## This script is invoked by udev rules whenever USB device appears or
## changes. This happens in usbvm domain (or dom0 if USB controller
## drivers are in dom0). The script records information about available
## USB devices into XS directory, making it available to qvm-usb tool
## running in dom0.
##
# FIXME: Ignore USB hubs and other wierd devices (see also in udev-usb-remove).
[ "`echo $TYPE | cut -f1 -d/`" = "9" ] && exit 0
[ "$DEVTYPE" != "usb_device" ] && exit 0
# xenstore doesn't allow dot in key name
XSNAME=`basename ${DEVPATH} | tr . _`
# FIXME: For some devices (my Cherry keyboard) ID_SERIAL does not
# contain proper human-readable name, should find better method to
# build devide description.
#DESC=`python -c "dev='%d-%d' % (int('${BUSNUM}'.lstrip('0')), (int('${DEVNUM}'.lstrip('0'))-1)); from xen.util import vusb_util; print vusb_util.get_usbdevice_info(dev);"`
DESC="${ID_VENDOR_ID}:${ID_MODEL_ID} ${ID_SERIAL}"
VERSION=`cat /sys/$DEVPATH/version`
if [ "${VERSION}" = " 1.00" -o "${VERSION}" = " 1.10" ] ; then
VERSION=1
elif [ "${VERSION}" = " 2.00" ] ; then
VERSION=2
else
# FIXME: silently ignoring devices with unexpected USB version
exit 0
fi
XS_KEY="qubes-usb-devices/$XSNAME"
xenstore-write "$XS_KEY/desc" "$DESC"
xenstore-write "$XS_KEY/usb-ver" "$VERSION"
# Make sure PVUSB backend driver is loaded.
/sbin/modprobe xen-usbback 2> /dev/null || /sbin/modprobe usbbk

9
udev/udev-usb-remove
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#!/bin/sh
# FIXME: Ignore USB hubs.
[ "`echo $TYPE | cut -f1 -d/`" = "9" ] && exit 0
NAME=`basename ${DEVPATH} | tr . _`
XS_KEY="qubes-usb-devices/$NAME"
xenstore-rm "$XS_KEY"

1
version
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1.0
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