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core-agent-linux/qubes-rpc/tar2qfile.c

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/*
/* $OpenBSD: tar.h,v 1.7 2003/06/02 23:32:09 millert Exp $ */
/* $NetBSD: tar.h,v 1.3 1995/03/21 09:07:51 cgd Exp $ */
/*-
* Copyright (c) 1992 Keith Muller.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Keith Muller of the University of California, San Diego.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)tar.h 8.2 (Berkeley) 4/18/94
*/
#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 <string.h>
#include <qfile-utils.h>
/***************************************************
* Most routines extracted from the PAX project (tar.c...) *
***************************************************/
/*
* BSD PAX global data structures and constants.
*/
#define MAXBLK 64512 /* MAX blocksize supported (posix SPEC) */
/* WARNING: increasing MAXBLK past 32256 */
/* will violate posix spec. */
#define MAXBLK_POSIX 32256 /* MAX blocksize supported as per POSIX */
#define BLKMULT 512 /* blocksize must be even mult of 512 bytes */
/* Don't even think of changing this */
#define DEVBLK 8192 /* default read blksize for devices */
#define FILEBLK 10240 /* default read blksize for files */
#define PAXPATHLEN 3072 /* maximium path length for pax. MUST be */
/*
* defines and data structures common to all tar formats
*/
#define CHK_LEN 8 /* length of checksum field */
#define TNMSZ 100 /* size of name field */
#define NULLCNT 2 /* number of null blocks in trailer */
#define CHK_OFFSET 148 /* start of chksum field */
#define BLNKSUM 256L /* sum of checksum field using ' ' */
/*
* General Defines
*/
#define HEX 16
#define OCT 8
#define _PAX_ 1
#define _TFILE_BASE "paxXXXXXXXXXX"
/*
* General Macros
*/
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif
#ifndef MAX
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif
#define MAJOR(x) major(x)
#define MINOR(x) minor(x)
#define TODEV(x, y) makedev((x), (y))
/*
* Values used in typeflag field in all tar formats
* (only REGTYPE, LNKTYPE and SYMTYPE are used in old bsd tar headers)
*/
#define REGTYPE '0' /* Regular File */
#define AREGTYPE '\0' /* Regular File */
#define LNKTYPE '1' /* Link */
#define SYMTYPE '2' /* Symlink */
#define CHRTYPE '3' /* Character Special File */
#define BLKTYPE '4' /* Block Special File */
#define DIRTYPE '5' /* Directory */
#define FIFOTYPE '6' /* FIFO */
#define CONTTYPE '7' /* high perf file */
/*
* GNU tar compatibility;
*/
#define LONGLINKTYPE 'K' /* Long Symlink */
#define LONGNAMETYPE 'L' /* Long File */
#define EXTHEADERTYPE 'x' /* Extended header */
/*
* Pad with a bit mask, much faster than doing a mod but only works on powers
* of 2. Macro below is for block of 512 bytes.
*/
#define TAR_PAD(x) ((512 - ((x) & 511)) & 511)
/*
* Data Interchange Format - Extended tar header format - POSIX 1003.1-1990
*/
#define TPFSZ 155
#define TMAGIC "ustar" /* ustar and a null */
#define TMAGLEN 6
#define TVERSION "00" /* 00 and no null */
#define TVERSLEN 2
typedef struct {
char name[TNMSZ]; /* name of entry */
char mode[8]; /* mode */
char uid[8]; /* uid */
char gid[8]; /* gid */
char size[12]; /* size */
char mtime[12]; /* modification time */
char chksum[CHK_LEN]; /* checksum */
char typeflag; /* type of file. */
char linkname[TNMSZ]; /* linked to name */
char magic[TMAGLEN]; /* magic cookie */
char version[TVERSLEN]; /* version */
char uname[32]; /* ascii owner name */
char gname[32]; /* ascii group name */
char devmajor[8]; /* major device number */
char devminor[8]; /* minor device number */
char prefix[TPFSZ]; /* linked to name */
} HD_USTAR;
/*
* Routines for manipulating headers, trailers:
* asc_ul()
* tar_trail()
* tar_chksm()
* ustar_id()
*/
static unsigned long tar_chksm (char *, int);
char *gnu_hack_string; /* GNU ././@LongLink hackery */
char untrusted_namebuf[MAX_PATH_LENGTH];
/*
* asc_ul()
* convert hex/octal character string into a u_long. We do not have to
* check for overflow! (the headers in all supported formats are not large
* enough to create an overflow).
* NOTE: strings passed to us are NOT TERMINATED.
* Return:
* unsigned long value
*/
u_long
asc_ul (char *str, int len, int base)
{
char *stop;
u_long tval = 0;
stop = str + len;
/*
* skip over leading blanks and zeros
*/
while ((str < stop) && ((*str == ' ') || (*str == '0')))
++str;
/*
* for each valid digit, shift running value (tval) over to next digit
* and add next digit
*/
if (base == HEX)
{
while (str < stop)
{
if ((*str >= '0') && (*str <= '9'))
tval = (tval << 4) + (*str++ - '0');
else if ((*str >= 'A') && (*str <= 'F'))
tval = (tval << 4) + 10 + (*str++ - 'A');
else if ((*str >= 'a') && (*str <= 'f'))
tval = (tval << 4) + 10 + (*str++ - 'a');
else
break;
}
}
else
{
while ((str < stop) && (*str >= '0') && (*str <= '7'))
tval = (tval << 3) + (*str++ - '0');
}
return (tval);
}
/*
* tar_trail()
* Called to determine if a header block is a valid trailer. We are passed
* the block, the in_sync flag (which tells us we are in resync mode;
* looking for a valid header), and cnt (which starts at zero) which is
* used to count the number of empty blocks we have seen so far.
* Return:
* 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
* could never contain a header.
*/
int
tar_trail (char *buf,
int in_resync, int *cnt)
{
register int i;
/*
* look for all zero, trailer is two consecutive blocks of zero
*/
for (i = 0; i < BLKMULT; ++i)
{
if (buf[i] != '\0')
break;
}
/*
* if not all zero it is not a trailer, but MIGHT be a header.
*/
if (i != BLKMULT)
return (-1);
/*
* When given a zero block, we must be careful!
* If we are not in resync mode, check for the trailer. Have to watch
* out that we do not mis-identify file data as the trailer, so we do
* NOT try to id a trailer during resync mode. During resync mode we
* might as well throw this block out since a valid header can NEVER be
* a block of all 0 (we must have a valid file name).
*/
if (!in_resync && (++*cnt >= NULLCNT))
return (0);
return (1);
}
/*
* tar_chksm()
* calculate the checksum for a tar block counting the checksum field as
* all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
* NOTE: we use len to short circuit summing 0's on write since we ALWAYS
* pad headers with 0.
* Return:
* unsigned long checksum
*/
static unsigned long
tar_chksm (char *blk, int len)
{
char *stop;
char *pt;
unsigned int chksm = BLNKSUM; /* initial value is checksum field sum */
/*
* add the part of the block before the checksum field
*/
pt = blk;
stop = blk + CHK_OFFSET;
while (pt < stop)
chksm += (*pt++ & 0xff);
/*
* move past the checksum field and keep going, spec counts the
* checksum field as the sum of 8 blanks (which is pre-computed as
* BLNKSUM).
* ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
* starts, no point in summing zero's)
*/
pt += CHK_LEN;
stop = blk + len;
while (pt < stop)
chksm += (*pt++ & 0xff);
return chksm;
}
/*
* ustar_id()
* determine if a block given to us is a valid ustar header. We have to
* be on the lookout for those pesky blocks of all zero's
* Return:
* 0 if a ustar header, -1 otherwise
*/
int
ustar_id (char *blk, size_t size)
{
HD_USTAR *hd;
if (size < BLKMULT)
return (-1);
hd = (HD_USTAR *) blk;
/*
* check for block of zero's first, a simple and fast test then check
* ustar magic cookie. We should use TMAGLEN, but some USTAR archive
* programs are fouled up and create archives missing the \0. Last we
* check the checksum. If ok we have to assume it is a valid header.
*/
if (hd->name[0] == '\0')
return (-1);
if (strncmp (hd->magic, TMAGIC, TMAGLEN - 1) != 0)
return (-1);
if (asc_ul (hd->chksum, sizeof (hd->chksum), OCT) !=
tar_chksm (blk, BLKMULT))
return (-1);
return (0);
}
/*
* Routines for reading tar files
// Source: http://www.mkssoftware.com/docs/man4/pax.4.asp
struct file_header { // PAX header is similar as file_header and can be completely ignored
unsigned char[100] name;
unsigned char[8] mode;
unsigned char[8] uid; // unused
unsigned char[8] gid; // unused
unsigned char[12] size; // 0 if file is a link
unsigned char[12] mtime;
unsigned char[8] chksum;
unsigned char[1] typeflag;
unsigned char[100] linkname;
unsigned char[6] magic; //ustar
unsigned char[2] version; // 00
unsigned char[32] uname; // unused
unsigned char[32] gname; // unused
unsigned char[8] devmajor; // unused ?
unsigned char[8] devminor; // unused ?
unsigned char[155] prefix; // only used for files > 100 characters. could be unused ?
};
enum {
TYPE_REGULAR, //0
TYPE_ARCHIVE_LINK, //1
TYPE_SYMLINK, //2
TYPE_CHARACTER_DEVICE, //3
TYPE_BLOCK_DEVICE, //4
TYPE_DIRECTORY, //5
TYPE_FIFO, //6
// Other types:
TYPE_EXTENDED_USAGE, //xxxxx
// A-Z are available for custom usage
};
// Extended attribute:
// length keyword=value
// atime, charset, comment, gname, linkpath, mtime, path, size, uname
*/
enum {
NEED_NOTHING,
NEED_SKIP,
NEED_READ,
NEED_SYNC_TRAIL,
INVALID_HEADER,
MEMORY_ALLOC_FAILED,
};
/*
* ustar_rd()
* extract the values out of block already determined to be a ustar header.
* store the values in the ARCHD parameter.
* Return:
* 0
*/
int n_dirs = 0;
char ** dirs_headers_sent = NULL;
int
ustar_rd (int fd, struct file_header * untrusted_hdr, char *buf, struct stat * sb)
{
register HD_USTAR *hd;
register char *dest;
register int cnt = 0;
int ret;
/* DISABLED: unused
dev_t devmajor;
dev_t devminor;
*/
/*
* we only get proper sized buffers
*/
fprintf(stderr,"Checking if valid header\n");
if (ustar_id (buf, BLKMULT) < 0) {
fprintf (stderr,"Invalid header\n");
return INVALID_HEADER;
}
fprintf(stderr,"Valid header!\n");
/* DISABLED: Internal to PAX
arcn->org_name = arcn->name;
arcn->sb.st_nlink = 1;
arcn->pat = NULL;
arcn->nlen = 0;
*/
untrusted_hdr->namelen = 0;
hd = (HD_USTAR *) buf;
/*
* see if the filename is split into two parts. if, so joint the parts.
* we copy the prefix first and add a / between the prefix and name.
*/
dest = untrusted_namebuf;
if (*(hd->prefix) != '\0')
{
cnt = strlen(strncpy (dest, hd->prefix,
MIN(sizeof (untrusted_namebuf) - 1,TPFSZ+1)));
dest += cnt;
*dest++ = '/';
cnt++;
}
if (gnu_hack_string)
{
untrusted_hdr->namelen = cnt + strlen(strncpy (dest, gnu_hack_string,
MIN(TNMSZ+1, sizeof (untrusted_namebuf) - cnt)));
free(gnu_hack_string);
gnu_hack_string = NULL;
} else
untrusted_hdr->namelen = cnt + strlen(strncpy (dest, hd->name,
MIN(TNMSZ+1, sizeof (untrusted_namebuf) - cnt)));
// qfile count the \0 in the namelen
untrusted_hdr->namelen += 1;
fprintf(stderr,"Retrieved name len: %d\n",untrusted_hdr->namelen);
fprintf(stderr,"Retrieved name: %s\n",untrusted_namebuf);
/*
* follow the spec to the letter. we should only have mode bits, strip
* off all other crud we may be passed.
*/
sb->st_mode = (mode_t) (asc_ul (hd->mode, sizeof (hd->mode), OCT) &
0xfff);
untrusted_hdr->mode = sb->st_mode;
#if defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
sb->st_size = (off_t) asc_uqd (hd->size, sizeof (hd->size), OCT);
#else
sb->st_size = (off_t) asc_ul (hd->size, sizeof (hd->size), OCT);
#endif
untrusted_hdr->filelen = sb->st_size;
untrusted_hdr->atime = (time_t) asc_ul (hd->mtime, sizeof (hd->mtime), OCT);
untrusted_hdr->mtime = untrusted_hdr->atime;
untrusted_hdr->atime_nsec = untrusted_hdr->mtime_nsec = 0;
sb->st_mtime = (time_t) asc_ul (hd->mtime, sizeof (hd->mtime), OCT);
sb->st_ctime = sb->st_atime = sb->st_mtime;
/*
* If we can find the ascii names for gname and uname in the password
* and group files we will use the uid's and gid they bind. Otherwise
* we use the uid and gid values stored in the header. (This is what
* the posix spec wants).
*/
/* DISABLED: unused
hd->gname[sizeof (hd->gname) - 1] = '\0';
if (gid_name (hd->gname, &(arcn->sb.st_gid)) < 0)
arcn->sb.st_gid = (gid_t) asc_ul (hd->gid, sizeof (hd->gid), OCT);
hd->uname[sizeof (hd->uname) - 1] = '\0';
if (uid_name (hd->uname, &(arcn->sb.st_uid)) < 0)
arcn->sb.st_uid = (uid_t) asc_ul (hd->uid, sizeof (hd->uid), OCT);
*/
/*
* set the defaults, these may be changed depending on the file type
*/
/* Disabled: pax specific
arcn->ln_name[0] = '\0';
arcn->ln_nlen = 0;
arcn->pad = 0;
arcn->skip = 0;
arcn->sb.st_rdev = (dev_t) 0;
*/
/*
* set the mode and PAX type according to the typeflag in the header
*/
switch (hd->typeflag)
{
case FIFOTYPE:
fprintf(stderr,"File is FIFOTYPE\n");
/* DISABLED: unused
arcn->type = PAX_FIF;
arcn->sb.st_mode |= S_IFIFO;
*/
break;
case DIRTYPE:
fprintf(stderr,"File is DIRTYPE\n");
/* DISABLED: unused
arcn->type = PAX_DIR;
arcn->sb.st_mode |= S_IFDIR;
arcn->sb.st_nlink = 2;
*/
/*
* Some programs that create ustar archives append a '/'
* to the pathname for directories. This clearly violates
* ustar specs, but we will silently strip it off anyway.
*/
/*
if (arcn->name[arcn->nlen - 1] == '/')
arcn->name[--arcn->nlen] = '\0';
*/
break;
case BLKTYPE:
fprintf(stderr,"File is BLKTYPE\n");
break;
case CHRTYPE:
fprintf(stderr,"File is CHRTYPE\n");
/*
* this type requires the rdev field to be set.
*/
if (hd->typeflag == BLKTYPE)
{
/*
arcn->type = PAX_BLK;
arcn->sb.st_mode |= S_IFBLK;
*/
}
else
{
/*
arcn->type = PAX_CHR;
arcn->sb.st_mode |= S_IFCHR;
*/
}
/* DISABLED: unused
devmajor = (dev_t) asc_ul (hd->devmajor, sizeof (hd->devmajor), OCT);
devminor = (dev_t) asc_ul (hd->devminor, sizeof (hd->devminor), OCT);
*/
// arcn->sb.st_rdev = TODEV (devmajor, devminor);
break;
case SYMTYPE:
fprintf(stderr,"File is SYMTYPE\n");
break;
case LNKTYPE:
fprintf(stderr,"File is LNKTYPE\n");
if (hd->typeflag == SYMTYPE)
{
// arcn->type = PAX_SLK;
// arcn->sb.st_mode |= S_IFLNK;
}
else
{
// arcn->type = PAX_HLK;
/*
* so printing looks better
*/
// arcn->sb.st_mode |= S_IFREG;
// arcn->sb.st_nlink = 2;
}
/*
* copy the link name
*/
// arcn->ln_nlen = strlcpy (arcn->ln_name, hd->linkname,
// MIN(TNMSZ+1,sizeof (arcn->ln_name)));
break;
case LONGLINKTYPE:
fprintf(stderr,"File is LONGLINKTYPE\n");
break;
case LONGNAMETYPE:
fprintf(stderr,"File is LONGNAMETYPE\n");
/*
* GNU long link/file; we tag these here and let the
* pax internals deal with it -- too ugly otherwise.
*/
// arcn->type =
// hd->typeflag == LONGLINKTYPE ? PAX_GLL : PAX_GLF;
// arcn->pad = TAR_PAD(arcn->sb.st_size);
// arcn->skip = arcn->sb.st_size;
// arcn->ln_name[0] = '\0';
// arcn->ln_nlen = 0;
break;
case CONTTYPE:
fprintf(stderr,"File is CONTTYPE\n");
break;
case AREGTYPE:
fprintf(stderr,"File is AREGTYPE\n");
break;
case REGTYPE:
fprintf(stderr,"File is REGTYPE of size %d\n",sb->st_size);
// Create a copy of untrusted_namebuf to be used for strtok
char * dirbuf;
dirbuf = malloc(sizeof (char) * (untrusted_hdr->namelen));
if (dirbuf == NULL)
return MEMORY_ALLOC_FAILED;
dirbuf = strncpy(dirbuf, untrusted_namebuf, untrusted_hdr->namelen);
int i = 0;
int dir_found = 0;
size_t pathsize = 0;
char * path = NULL;
struct file_header dir_header;
// Split the path in directories and recompose it incrementally
char * last_token = strtok(dirbuf,"/");
char * token = strtok(NULL, "/");
while (token != NULL) {
fprintf(stderr,"Found directory %s (last:%s)\n",token,last_token);
// Recompose the path based on last discovered directory
if (path == NULL) {
path = malloc(sizeof (char) * (strlen(last_token)+1));
if (path == NULL)
return MEMORY_ALLOC_FAILED;
path = strncpy(path, last_token, strlen(last_token));
path[strlen(last_token)] = '\0';
} else {
pathsize = strlen(path);
path = realloc(path, sizeof (char) * (strlen(path)+1+strlen(last_token)+1));
if (path == NULL)
return MEMORY_ALLOC_FAILED;
path[pathsize] = '/';
strncpy(path+pathsize+1, last_token, strlen(last_token));
path[pathsize+strlen(last_token)+1] = '\0';
}
fprintf(stderr,"Path is %s\n",path);
fprintf(stderr,"Checking from i=0 i<%d\n",n_dirs);
// Verify if qfile headers for the current path have already been sent based on the dirs_headers_sent table
dir_found = 0;
for (i = 0; i < n_dirs; ++i) {
fprintf(stderr,"Comparing with %d %d %s %s\n",i,n_dirs,dirs_headers_sent[i],path);
if (strcmp(dirs_headers_sent[i],path)==0) {
fprintf(stderr,"Directory headers already sent\n");
dir_found=1;
}
}
if (dir_found == 0) {
// Register the current path as being sent in the dirs_headers_sent table
fprintf(stderr,"Inserting %s into register\n",path);
dirs_headers_sent = realloc(dirs_headers_sent, sizeof (char*) * n_dirs++);
if (dirs_headers_sent == NULL)
return MEMORY_ALLOC_FAILED;
dirs_headers_sent[n_dirs-1] = malloc(sizeof (char) * (strlen(path)+1));
if (dirs_headers_sent[n_dirs-1] == NULL)
return MEMORY_ALLOC_FAILED;
strncpy(dirs_headers_sent[n_dirs-1], path, strlen(path)+1);
// Initialize the qfile headers for the current directory path
dir_header.namelen = strlen(path)+1;
dir_header.atime = untrusted_hdr->atime;
dir_header.atime_nsec = untrusted_hdr->atime_nsec;
dir_header.mtime = untrusted_hdr->mtime;
dir_header.mtime_nsec = untrusted_hdr->mtime_nsec;
dir_header.mode = untrusted_hdr->mode | S_IFDIR;
dir_header.filelen = 0;
fprintf(stderr,"Sending directory headers for %s\n",path);
// Send the qfile headers for the current directory path
write_headers(&dir_header, path);
}
last_token = token;
token = strtok(NULL, "/");
}
free(path);
free(dirbuf);
fprintf(stderr,"End of directory checks\n");
// Restore POSIX stat file mode (because PAX format use its own file type)
untrusted_hdr->mode |= S_IFREG;
fprintf(stderr,"Writing file header\n");
// Send header and file content
write_headers(untrusted_hdr, untrusted_namebuf);
fprintf(stderr,"Writing file content\n");
ret = copy_file(1, fd, untrusted_hdr->filelen, &crc32_sum);
fprintf(stderr,"Copyfile returned with error %d\n",ret);
if (ret != COPY_FILE_OK) {
if (ret != COPY_FILE_WRITE_ERROR)
gui_fatal("Copying file %s: %s", untrusted_namebuf,
copy_file_status_to_str(ret));
else {
fprintf(stderr,"UNKNOWN ERROR RETURN STATUS:%d\n.. Waiting...\n",ret);
set_block(0);
wait_for_result();
exit(1);
}
}
// Extract extra padding
fprintf(stderr,"Need to remove pad:%d %d\n",sb->st_size,BLKMULT-(sb->st_size%BLKMULT));
ret = read(fd, buf, BLKMULT-(sb->st_size%BLKMULT));
fprintf(stderr,"Removed %d bytes of padding\n",ret);
// Resync trailing headers in order to find next file chunck in the tar file
return NEED_SYNC_TRAIL;
break;
case EXTHEADERTYPE:
fprintf(stderr,"Extended HEADER encountered\n");
return NEED_SKIP;
break;
default:
fprintf(stderr,"Default type detected:%c\n",hd->typeflag);
return NEED_SKIP;
/*
* these types have file data that follows. Set the skip and
* pad fields.
*/
// arcn->type = PAX_REG;
// arcn->pad = TAR_PAD (arcn->sb.st_size);
// arcn->skip = arcn->sb.st_size;
// arcn->sb.st_mode |= S_IFREG;
break;
}
return NEED_SKIP;
}
int tar_file_processor(int fd)
{
int ret;
int i;
int current;
struct file_header hdr;
struct stat sb; /* stat buffer see stat(2) */
char buf[BLKMULT+1];
size_t size;
i=0;
current = NEED_READ;
size_t to_skip = 0;
int sync_count = 0;
while (size = read(fd, &buf, BLKMULT)) {
if (size != -1) {
fprintf(stderr,"Read %d bytes\n",size);
ret = 0;
if (current==NEED_SYNC_TRAIL) {
ret = tar_trail (buf, 1, &sync_count);
fprintf(stderr,"Synchronizing trail: %d %d\n",ret,sync_count);
if (ret != 1) {
current = NEED_READ;
}
}
if (current==NEED_READ) {
current = ustar_rd(fd, &hdr, &buf, &sb);
fprintf(stderr,"Return %d\n",ret);
}
if (current==NEED_SKIP) {
fprintf(stderr,"Need to skip %d bytes\n",sb.st_size);
to_skip = sb.st_size;
while (to_skip > 0) {
to_skip -= read(fd, &buf, MIN(to_skip,BLKMULT));
}
// Extract extra padding
fprintf(stderr,"Need to remove pad:%d %d %d\n",to_skip,sb.st_size,BLKMULT-(sb.st_size%BLKMULT));
ret = read(fd, &buf, BLKMULT-(sb.st_size%BLKMULT));
fprintf(stderr,"Removed %d bytes of padding\n",ret);
current = NEED_READ;
}
i++;
}
//if (i >= 10)
// exit(0);
}
}
int main(int argc, char **argv)
{
int i;
char *entry;
char *cwd;
char *sep;
int fd;
signal(SIGPIPE, SIG_IGN);
// this will allow checking for possible feedback packet in the middle of transfer
// if disabled, the copy_file process could hang
notify_progress(0, PROGRESS_FLAG_INIT);
//set_size_limit(1500000000, 2048);
crc32_sum = 0;
cwd = getcwd(NULL, 0);
for (i = 1; i < argc; i++) {
set_nonblock(0);
if (strcmp(argv[i], "--ignore-symlinks")==0) {
ignore_symlinks = 1;
continue;
} else {
// Parse tar file
entry = argv[i];
fprintf(stderr,"Parsing file %s\n",entry);
fd = open(entry, O_RDONLY);
if (fd < 0)
fprintf(stderr,"Error opening file %s\n",entry);
tar_file_processor(fd);
}
}
if (i <= 1) {
// No argument specified. Use STDIN
fprintf(stderr,"Using STDIN\n");
set_block(0);
tar_file_processor(fileno(stdin));
}
//notify_end_and_wait_for_result();
notify_progress(0, PROGRESS_FLAG_DONE);
return 0;
}
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