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tarlib.c
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/* Copyright 2009 - 2021 Derek Pressnall
*
* This file is part of gne, the Tar Genie
*
* Gne is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License Version 3
* as published by the Free Software Foundation.
*
* Gne 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 Gne. If not, see <https://www.gnu.org/licenses/>.
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <lzo/lzoconf.h>
#include <lzo/lzo1x.h>
#include <arpa/inet.h>
#include <getopt.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/hmac.h>
#include <openssl/ui.h>
#include "tarlib.h"
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
EVP_MD_CTX *EVP_MD_CTX_new(void);
void EVP_MD_CTX_free(EVP_MD_CTX *ctx);
HMAC_CTX *HMAC_CTX_new(void);
void HMAC_CTX_free(HMAC_CTX *ctx);
int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx) ;
int HMAC_CTX_reset(HMAC_CTX *ctx);
static void *OPENSSL_zalloc(size_t num);
#endif
char *saved_passwords = NULL;
int tar_get_next_hdr(struct filespec *fs)
{
struct tarhead tarhead;
int longfilename = 0;
int longlinktarget = 0;
int count;
int tcount;
long long unsigned int bytestoread;
int blockpad;
char junk[512];
char *paxpath = NULL;
char *paxlinkpath = NULL;
int paxpathlen = 0;
int paxlinkpathlen = 0;
char *paxsize = NULL;
int paxsizelen = 0;
int usepaxsize = 0;
int paxsparse = 0;
char *paxsparsename = 0;
int paxsparsenamelen = 0;
char *paxsparsesize = 0;
int paxsparsesizelen = 0;
char *paxsparsesegt = 0;
int paxsparsenseg = 0;
int paxsparsehdrsz = 0;
char s_isextended;
struct speh speh;
struct tarhead tarheadchk;
unsigned int tmpchksum;
char *p;
int i;
fsclear(fs);
while(1) {
count = fs->io_func(&tarhead, 1, 512, fs->io_handle);
if (count <= 0 || tarhead.filename[0] == 0) { // End of TAR archive
return(0);
}
tarheadchk = tarhead;
memcpy(tarheadchk.chksum, " ", 8);
for (tmpchksum = 0, p = (char *) (&tarheadchk), i = 512; i != 0; --i, ++p)
tmpchksum += 0xFF & *p;
sprintf(tarheadchk.chksum, "%6.6o", tmpchksum);
if (strcmp(tarhead.chksum, tarheadchk.chksum) != 0)
fprintf(stderr, "Tar checksum %s does not computed checksum %s\n", tarhead.chksum, tarheadchk.chksum);
// A file type of "L" means a long (> 100 character) file name.
if (*(tarhead.ftype) == 'L') {
longfilename = 1;
bytestoread=strtoull(tarhead.size, 0, 8);
blockpad = 512 - ((bytestoread - 1) % 512 + 1);
if (dmalloc_size(fs->filename) < bytestoread + 1)
fs->filename = drealloc(fs->filename, bytestoread + 1);
tcount = 0;
while (bytestoread - tcount > 0) {
count = fs->io_func(fs->filename + tcount, 1, bytestoread - tcount, fs->io_handle);
if (count == 0) {
fprintf(stderr, "Error\n");
return(0);
}
tcount += count;
}
tcount = 0;
while (blockpad - tcount > 0) {
count = fs->io_func(junk, 1, blockpad - tcount, fs->io_handle);
if (count == 0) {
fprintf(stderr, "Error\n");
return(0);
}
tcount += count;
}
fs->filename[bytestoread] = 0;
continue;
}
// A file type of "K" means a long (> 100 character) link target.
if (*(tarhead.ftype) == 'K') {
longlinktarget = 1;
bytestoread=strtoull(tarhead.size, 0, 8);
blockpad = 512 - ((bytestoread - 1) % 512 + 1);
if (dmalloc_size(fs->linktarget) < bytestoread + 1)
fs->linktarget = drealloc(fs->linktarget, bytestoread + 1);
tcount = 0;
while (bytestoread - tcount > 0) {
count = fs->io_func(fs->linktarget + tcount, 1, bytestoread - tcount, fs->io_handle);
if (count == 0) {
fprintf(stderr, "Error\n");
return(0);
}
tcount += count;
}
tcount = 0;
while (blockpad - tcount > 0) {
count = fs->io_func(junk, 1, blockpad - tcount, fs->io_handle);
if (count == 0) {
fprintf(stderr, "Error\n");
return(0);
}
tcount += count;
}
fs->linktarget[bytestoread] = 0;
continue;
}
// File type "x" is an extended header for the following file
if (*(tarhead.ftype) == 'x' || *(tarhead.ftype) == 'g') {
if (*(tarhead.ftype) == 'g')
fs->ftype = 'g';
bytestoread=strtoull(tarhead.size, 0, 8);
fs->xheaderlen = bytestoread;
blockpad = 512 - ((bytestoread - 1) % 512 + 1);
if (dmalloc_size(fs->xheader) < bytestoread)
fs->xheader = drealloc(fs->xheader, bytestoread);
tcount = 0;
while (bytestoread - tcount > 0) {
count = fs->io_func(fs->xheader + tcount, 1, bytestoread - tcount, fs->io_handle);
if (count == 0) {
fprintf(stderr, "End of file reading extended header\n");
exit(1);
}
tcount += count;
}
tcount = 0;
while (blockpad - tcount > 0) {
count = fs->io_func(junk, 1, blockpad - tcount, fs->io_handle);
tcount += count;
}
if (getpaxvar(fs->xheader, fs->xheaderlen, "path", &paxpath, &paxpathlen) == 0) {
strncpya0(&(fs->filename), paxpath, paxpathlen - 1);
longfilename = 1;
delpaxvar(&(fs->xheader), &(fs->xheaderlen), "path");
}
if (getpaxvar(fs->xheader, fs->xheaderlen, "linkpath", &paxlinkpath, &paxlinkpathlen) == 0) {
strncpya0(&(fs->linktarget), paxlinkpath, paxlinkpathlen - 1);
longlinktarget = 1;
fs->linktarget[paxlinkpathlen - 1] = '\0';
delpaxvar(&(fs->xheader), &(fs->xheaderlen), "linkpath");
}
if (getpaxvar(fs->xheader, fs->xheaderlen, "size", &paxsize, &paxsizelen) == 0) {
fs->filesize = strtoull(paxsize, 0, 10);
usepaxsize = 1;
delpaxvar(&(fs->xheader), &(fs->xheaderlen), "size");
}
if (cmpspaxvar(fs->xheader, fs->xheaderlen, "GNU.sparse.major", "1") == 0 &&
cmpspaxvar(fs->xheader, fs->xheaderlen, "GNU.sparse.minor", "0") == 0) {
paxsparse=1;
getpaxvar(fs->xheader, fs->xheaderlen, "GNU.sparse.name", &paxsparsename, &paxsparsenamelen);
getpaxvar(fs->xheader, fs->xheaderlen, "GNU.sparse.realsize", &paxsparsesize, &paxsparsesizelen);
fs->sparse_realsize = strtoull(paxsparsesize, 0, 10);
strncpya0(&(fs->filename), paxsparsename, paxsparsenamelen - 1);
longfilename = 1;
delpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.major");
delpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.minor");
delpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.name");
delpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.realsize");
}
if (*(tarhead.ftype) == 'g')
return(1);
continue;
}
// Process TAR header
if (*(tarhead.ftype) == '0' || *(tarhead.ftype) == 'S') {
fs->ftype = '0';
if (longfilename == 0)
strncpya0(&(fs->filename), tarhead.filename, 100);
fs->mode=strtol(tarhead.mode + 2, 0, 8);
fs->nuid=strtol(tarhead.nuid, 0, 8);
fs->ngid=strtol(tarhead.ngid, 0, 8);
if (usepaxsize == 0) {
fs->filesize = 0;
if ((unsigned char) tarhead.size[0] == 128)
for (int i = 0; i < 8; i++) {
fs->filesize += (( ((unsigned long long) ((unsigned char) (tarhead.size[11 - i]))) << (i * 8)));
}
else
fs->filesize=strtoull(tarhead.size, 0, 8);
}
fs->modtime=strtol(tarhead.modtime, 0, 8);
if (strlen(tarhead.auid) == 0)
sprintf(tarhead.auid, "%d", fs->nuid);
if (strlen(tarhead.agid) == 0)
sprintf(tarhead.agid, "%d", fs->ngid);
strncpy(fs->auid, tarhead.auid, 32);
fs->auid[32] = 0;
strncpy(fs->agid, tarhead.agid, 32);
fs->agid[32] = 0;
// Handle GNU sparse files
if (*(tarhead.ftype) == 'S' && paxsparse != 1) {
s_isextended = tarhead.u.sph.isextended;
fs->sparse_realsize = g2ulli(tarhead.u.sph.realsize);
if (dmalloc_size(fs->sparsedata) < 4 * sizeof(struct sparsedata))
fs->sparsedata = drealloc(fs->sparsedata, 4 * sizeof(struct sparsedata));
for (fs->n_sparsedata = 0; fs->n_sparsedata < 4 && tarhead.u.sph.sd[fs->n_sparsedata].offset[0] != 0; fs->n_sparsedata++) {
fs->sparsedata[fs->n_sparsedata].offset = g2ulli(tarhead.u.sph.sd[fs->n_sparsedata].offset);
fs->sparsedata[fs->n_sparsedata].size= g2ulli(tarhead.u.sph.sd[fs->n_sparsedata].size);
}
while (s_isextended == 1) {
count = fs->io_func(&speh, 1, 512, fs->io_handle);
if (count < 512) {
fprintf(stderr, "Error\n");
return(0);
}
s_isextended = speh.isextended;
if (dmalloc_size(fs->sparsedata) < (fs->n_sparsedata + 21) * sizeof(struct sparsedata))
fs->sparsedata = drealloc(fs->sparsedata, (fs->n_sparsedata + 21) * sizeof(struct sparsedata));
for (int e = 0; e < 21 && speh.sd[e].offset[0] != 0; e++, fs->n_sparsedata++) {
fs->sparsedata[fs->n_sparsedata].offset = g2ulli(speh.sd[e].offset);
fs->sparsedata[fs->n_sparsedata].size = g2ulli(speh.sd[e].size);
}
}
}
if (paxsparse == 1){
fs->ftype = '0';
paxsparsehdrsz = 0;
paxsparsehdrsz += c_getline(&paxsparsesegt, fs->io_func, fs->io_handle);
paxsparsenseg = atoi(paxsparsesegt);
fs->n_sparsedata = 0;
if (dmalloc_size(fs->sparsedata) < paxsparsenseg * sizeof(struct sparsedata))
fs->sparsedata = drealloc(fs->sparsedata, paxsparsenseg * sizeof(struct sparsedata));
while (paxsparsenseg-- > 0) {
paxsparsehdrsz += c_getline(&paxsparsesegt, fs->io_func, fs->io_handle);
fs->sparsedata[fs->n_sparsedata].offset = strtoull(paxsparsesegt, 0, 10);
paxsparsehdrsz += c_getline(&paxsparsesegt, fs->io_func, fs->io_handle);
fs->sparsedata[fs->n_sparsedata].size = strtoull(paxsparsesegt, 0, 10);
fs->n_sparsedata++;
}
free(paxsparsesegt);
if ((paxsparsehdrsz % 512) > 0) {
paxsparsehdrsz += fs->io_func(junk, 1, 512 - paxsparsehdrsz % 512, fs->io_handle);
}
fs->filesize -= paxsparsehdrsz;
}
return(1);
}
if (*(tarhead.ftype) == '5' || *(tarhead.ftype) == '1' || *(tarhead.ftype) == '2') {
fs->ftype = *(tarhead.ftype);
if (longfilename == 0)
strncpya0(&(fs->filename), tarhead.filename, 100);
fs->mode=strtol(tarhead.mode + 2, 0, 8);
fs->nuid=strtol(tarhead.nuid, 0, 8);
fs->ngid=strtol(tarhead.ngid, 0, 8);
if (usepaxsize == 0) {
fs->filesize = 0;
if ((unsigned char) tarhead.size[0] == 128)
for (int i = 0; i < 8; i++) {
fs->filesize += (( ((unsigned long long) ((unsigned char) (tarhead.size[11 - i]))) << (i * 8)));
}
else
fs->filesize=strtoull(tarhead.size, 0, 8);
}
fs->modtime=strtol(tarhead.modtime, 0, 8);
if (longlinktarget == 0 && (*(tarhead.ftype) == '1' || *(tarhead.ftype) == '2'))
strncpya0(&(fs->linktarget), tarhead.linktarget, 100);
if (strlen(tarhead.auid) == 0)
sprintf(tarhead.auid, "%d", fs->nuid);
if (strlen(tarhead.agid) == 0)
sprintf(tarhead.agid, "%d", fs->ngid);
strncpy(fs->auid, tarhead.auid, 32);
fs->auid[32] = 0;
strncpy(fs->agid, tarhead.agid, 32);
fs->agid[32] = 0;
}
return(1);
}
}
int tar_write_next_hdr(struct filespec *fs) {
int genpax = 0;
int paxlongfilename = 0;
int gnulongfilename = 0;
int gnulonglinktarget = 0;
int paxlonglinktarget = 0;
struct tarhead tarhead;
char curblock[512];
char pax_size[16];
struct speh speh;
unsigned int tmpchksum;
char *p;
int i;
int paxsparsehdrsz = 0;
unsigned long long int filesize = fs->filesize;
memset(&tarhead, 0, 512);
if (fs->filename == NULL || fs->filename[0] == 0)
return(-1);
if (fs->xheaderlen > 0) {
genpax = 1;
fs->pax = 1;
}
if (strlen(fs->filename) > 100) {
if (fs->pax == 1) {
genpax = 1;
paxlongfilename = 1;
}
else
gnulongfilename = 1;
}
if (strlen(fs->linktarget) > 100) {
if (fs->pax == 1) {
genpax = 1;
paxlonglinktarget = 1;
}
else
gnulonglinktarget = 1;
}
if (gnulonglinktarget == 1) {
// generate and output gnu long filename header
memset(&tarhead, 0, 512);
strcpy(tarhead.filename, "././@LongLink");
*(tarhead.ftype) = 'K';
strcpy(tarhead.nuid, "0000000");
strcpy(tarhead.ngid, "0000000");
strcpy(tarhead.mode, "0000000");
sprintf(tarhead.size, "%11.11o", (unsigned int) strlen(fs->linktarget));
strcpy(tarhead.modtime, "00000000000");
memcpy(tarhead.ustar, "ustar ", 6);
strcpy(tarhead.auid, "root");
strcpy(tarhead.agid, "root");
memcpy(tarhead.chksum, " ", 8);
for (tmpchksum = 0, p = (char *) (&tarhead), i = 512;
i != 0; --i, ++p)
tmpchksum += 0xFF & *p;
sprintf(tarhead.chksum, "%6.6o", tmpchksum);
fs->io_func(&tarhead, 1, 512, fs->io_handle); // write out long file name header
for (i = 0; i < strlen(fs->linktarget); i += 512) {
memset(curblock, 0, 512);
memcpy(curblock, fs->linktarget + i, strlen(fs->linktarget) - i >= 512 ? 512 :
(strlen(fs->linktarget) - i));
fs->io_func(curblock, 1, 512, fs->io_handle); // write out long file name data
}
}
if (gnulongfilename == 1) {
// generate and output gnu long filename header
memset(&tarhead, 0, 512);
strcpy(tarhead.filename, "././@LongFilename");
*(tarhead.ftype) = 'L';
strcpy(tarhead.nuid, "0000000");
strcpy(tarhead.ngid, "0000000");
strcpy(tarhead.mode, "0000000");
sprintf(tarhead.size, "%11.11o", (unsigned int) strlen(fs->filename));
strcpy(tarhead.modtime, "00000000000");
memcpy(tarhead.ustar, "ustar ", 6);
strcpy(tarhead.auid, "root");
strcpy(tarhead.agid, "root");
memcpy(tarhead.chksum, " ", 8);
for (tmpchksum = 0, p = (char *) (&tarhead), i = 512;
i != 0; --i, ++p)
tmpchksum += 0xFF & *p;
sprintf(tarhead.chksum, "%6.6o", tmpchksum);
fs->io_func(&tarhead, 1, 512, fs->io_handle); // write out long file name header
for (i = 0; i < strlen(fs->filename); i += 512) {
memset(curblock, 0, 512);
memcpy(curblock, fs->filename + i, strlen(fs->filename) - i >= 512 ? 512 :
(strlen(fs->filename) - i));
fs->io_func(curblock, 1, 512, fs->io_handle); // write out long file name data
}
}
if (paxlonglinktarget == 1)
setpaxvar(&(fs->xheader), &(fs->xheaderlen), "linkpath", fs->linktarget, strlen(fs->linktarget));
if (paxlongfilename == 1)
setpaxvar(&(fs->xheader), &(fs->xheaderlen), "path", fs->filename, strlen(fs->filename));
if (fs->n_sparsedata > 0 && fs->pax == 1)
genpax = 1;
// generate and write pax header
if (genpax == 1) {
memset(&tarhead, 0, 512);
strcpy(tarhead.filename, "././@xheader");
if (fs->ftype == 'g') {
*(tarhead.ftype) = 'g';
}
else {
*(tarhead.ftype) = 'x';
}
strcpy(tarhead.nuid, "0000000");
strcpy(tarhead.ngid, "0000000");
strcpy(tarhead.mode, "0000000");
strcpy(tarhead.modtime, "00000000000");
sprintf(tarhead.ustar, "ustar");
memcpy(tarhead.ustarver, "00", 2);
strcpy(tarhead.auid, "root");
strcpy(tarhead.agid, "root");
if (fs->n_sparsedata > 0) {
sprintf(pax_size, "%lld", fs->sparse_realsize);
setpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.major", "1", 1);
setpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.minor", "0", 1);
setpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.name", (char *) fs->filename, strlen(fs->filename));
setpaxvar(&(fs->xheader), &(fs->xheaderlen), "GNU.sparse.realsize", pax_size, strlen(pax_size));
}
sprintf(tarhead.size, "%11.11o", fs->xheaderlen);
memcpy(tarhead.chksum, " ", 8);
for (tmpchksum = 0, p = (char *) (&tarhead), i = 512;
i != 0; --i, ++p)
tmpchksum += 0xFF & *p;
sprintf(tarhead.chksum, "%6.6o", tmpchksum);
fs->io_func(&tarhead, 1, 512, fs->io_handle); // write out pax header
for (i = 0; i < fs->xheaderlen; i += 512) {
memset(curblock, 0, 512);
memcpy(curblock, fs->xheader + i, fs->xheaderlen - i >= 512 ? 512 :
(fs->xheaderlen - i));
fs->io_func(curblock, 1, 512, fs->io_handle); // write out pax data
}
if (fs->ftype == 'g')
return(0);
}
// Create and write tar file header
memset(&tarhead, 0, 512);
memcpy(tarhead.filename, fs->filename, strlen(fs->filename) < 100 ? strlen(fs->filename) : 100);
if (fs->linktarget != 0)
memcpy(tarhead.linktarget, fs->linktarget, strlen(fs->linktarget) < 100 ? strlen(fs->linktarget) : 100);
if (genpax == 0) {
memcpy(tarhead.ustar, "ustar ", 6);
sprintf(tarhead.ustarver, " ");
}
else {
sprintf(tarhead.ustar, "ustar");
memcpy(tarhead.ustarver, "00", 2);
}
*(tarhead.ftype) = fs->ftype;
sprintf(tarhead.mode, "%7.7o", fs->mode);
memcpy(tarhead.auid, fs->auid, strlen(fs->auid) < 32 ? strlen(fs->auid) : 32);
sprintf(tarhead.nuid, "%7.7o", fs->nuid);
memcpy(tarhead.agid, fs->agid, strlen(fs->agid) < 32 ? strlen(fs->agid) : 32);
sprintf(tarhead.ngid, "%7.7o", fs->ngid);
sprintf(tarhead.modtime, "%11.11o", (unsigned int) fs->modtime);
if (genpax == 0 && fs->n_sparsedata > 0) {
*(tarhead.ftype) = 'S';
ulli2g(fs->sparse_realsize, tarhead.u.sph.realsize);
for (int i = 0; i < fs->n_sparsedata && i < 4; i++) {
ulli2g(fs->sparsedata[i].offset, tarhead.u.sph.sd[i].offset);
ulli2g(fs->sparsedata[i].size, tarhead.u.sph.sd[i].size);
}
if (fs->n_sparsedata > 4)
tarhead.u.sph.isextended = 1;
}
if (genpax == 1 && fs->n_sparsedata > 0) {
paxsparsehdrsz = 0;
paxsparsehdrsz += ilog10(fs->n_sparsedata) + 2;
for (int i = 0; i < fs->n_sparsedata; i++) {
if (fs->sparsedata[i].offset != 0)
paxsparsehdrsz += ilog10(fs->sparsedata[i].offset) + 2;
else
paxsparsehdrsz += 1;
if (fs->sparsedata[i].size != 0)
paxsparsehdrsz += ilog10(fs->sparsedata[i].size) + 2;
else
paxsparsehdrsz += 1;
}
paxsparsehdrsz += 1;
if ((paxsparsehdrsz % 512) != 0)
paxsparsehdrsz += (512 - (paxsparsehdrsz % 512));
filesize += paxsparsehdrsz;
}
ulli2g(filesize, tarhead.size);
memcpy(tarhead.chksum, " ", 8);
for (tmpchksum = 0, p = (char *) (&tarhead), i = 512;
i != 0; --i, ++p)
tmpchksum += 0xFF & *p;
sprintf(tarhead.chksum, "%6.6o", tmpchksum);
fs->io_func(&tarhead, 1, 512, fs->io_handle);
// Write out extended GNU sparse header
if (tarhead.u.sph.isextended == 1) {
int i;
memset(&speh, 0, sizeof(speh));
for (i = 4; i < fs->n_sparsedata; i++) {
ulli2g(fs->sparsedata[i].offset, speh.sd[(i - 4) % 21].offset);
ulli2g(fs->sparsedata[i].size, speh.sd[(i - 4) % 21].size);
if ((i + 1 - 4) % 21 == 0 && i > 4) {
if (i < fs->n_sparsedata - 1)
speh.isextended = 1;
else {
speh.isextended = 0;
}
fs->io_func(&speh, 1, 512, fs->io_handle);
memset(&speh, 0, sizeof(speh));
}
}
if ((i - 4) % 21 != 0) {
fs->io_func(&speh, 1, 512, fs->io_handle);
memset(&speh, 0, sizeof(speh));
}
}
if (genpax == 1 && fs->n_sparsedata > 0) {
char sbuf[32];
int sbufn;
paxsparsehdrsz = 0;
sbufn = sprintf(sbuf, "%d\n", (unsigned int) fs->n_sparsedata);
paxsparsehdrsz += fs->io_func(sbuf, 1, sbufn, fs->io_handle);
for (int i = 0; i < fs->n_sparsedata; i++) {
sbufn = sprintf(sbuf, "%llu\n", fs->sparsedata[i].offset);
paxsparsehdrsz += fs->io_func(sbuf, 1, sbufn, fs->io_handle);
sbufn = sprintf(sbuf, "%llu\n", fs->sparsedata[i].size);
paxsparsehdrsz += fs->io_func(sbuf, 1, sbufn, fs->io_handle);
}
memset(curblock, '\0', 512);
if ((paxsparsehdrsz % 512) > 0)
paxsparsehdrsz += fs->io_func(curblock, 1, 512 - paxsparsehdrsz % 512, fs->io_handle);
}
return(0);
}
int getpaxvar(char *paxdata, int paxlen, char *name, char **rvalue, int *rvaluelen) {
char *nvp = paxdata;
int nvplen;
char *cname;
int cnamelen;
char *value;
int valuelen;
while (nvp < paxdata + paxlen) {
nvplen = strtol(nvp, &cname, 10);
cname++;
value = strchr(cname, '=');
cnamelen = value - cname;
value++;
valuelen = nvp + nvplen - value;
if (cnamelen >= strlen(name) && strncmp(name, cname, cnamelen) == 0) {
*rvalue = value;
*rvaluelen = valuelen;
return(0);
}
if (nvplen <= 0)
return(1);
nvp += nvplen;
}
return(1);
}
int getpaxvarlist(char *paxdata, int paxlen, char **namelist) {
char *nvp = paxdata;
int nvplen;
char *cname = NULL;
int cnamelen = 0;
char *value;
int sz = 0;
int n = 0;
while (nvp < paxdata + paxlen) {
nvplen = strtol(nvp, &cname, 10);
cname++;
value = strchr(cname, '=');
cnamelen = value - cname;
value++;
memcpyao((void **) namelist, cname, cnamelen, sz);
sz += cnamelen;
memcpyao((void **) namelist, "\0", cnamelen, sz);
sz += 1;
nvp += nvplen;
n++;
}
memcpyao((void **) namelist, "\0", cnamelen, sz);
sz += 1;
return(n);
}
int catpaxvars(char **outpaxdata, int *outpaxdatalen, char *inpaxdata, int inpaxdatalen)
{
char *inpaxvarlist = NULL;
int z;
char *paxdata;
int paxdatalen;
z = getpaxvarlist(inpaxdata, inpaxdatalen, &inpaxvarlist);
char *p = inpaxvarlist;
for (int i = 0; i < z; i++) {
getpaxvar(inpaxdata, inpaxdatalen, p, &paxdata, &paxdatalen);
setpaxvar(outpaxdata, outpaxdatalen, p, paxdata, paxdatalen - (paxdatalen > 1 && paxdata[paxdatalen - 1] == '\n' ? 1 : 0));
p += strlen(p) + 1;
}
if (inpaxvarlist != NULL)
dfree(inpaxvarlist);
return(0);
}
int cmpspaxvar(char *paxdata, int paxlen, char *name, char *invalue) {
char *nvp = paxdata;
int nvplen;
char *cname;
int cnamelen;
char *value;
int namelen = strlen(name);
int valuelen;
while (nvp < paxdata + paxlen) {
nvplen = strtol(nvp, &cname, 10);
cname++;
value = strchr(cname, '=');
cnamelen = value - cname;
value++;
valuelen = nvp + nvplen - value;
if (cnamelen >= namelen && strncmp(name, cname, cnamelen) == 0) {
return(strncmp(value, invalue, valuelen - 1));
}
nvp += nvplen;
}
return(1);
}
int setpaxvar(char **paxdata, int *paxlen, char *inname, char *invalue, int invaluelen) {
int cnvp = 0;
int cnvplen;
char *cname = NULL;
int cnamelen;
char *cvalue;
int innamelen = strlen(inname);
int innvplen;
char *nvpline = NULL;
int foundit=0;
int x;
innvplen = innamelen + invaluelen + 3 + (ilog10(innamelen + invaluelen + 3 + (ilog10( innamelen + invaluelen + 3)) + 1)) + 1;
nvpline = malloc(innvplen + 1);
sprintf(nvpline, "%d %s=", innvplen, inname);
x = strlen(nvpline);
memcpy(nvpline + x, invalue, invaluelen);
memcpy(nvpline + x + invaluelen, "\n\0", 2);
while (*paxdata + cnvp < *paxdata + *paxlen) {
cnvplen = strtol(*paxdata + cnvp, &cname, 10);
cname++;
cvalue = strchr(cname, '=');
cnamelen = cvalue - cname;
cvalue++;
if (cnamelen >= innamelen && strncmp(inname, cname, cnamelen) == 0) {
if (innvplen > cnvplen) {
*paxlen = *paxlen + (innvplen - cnvplen);
*paxdata = drealloc(*paxdata, *paxlen);
memmove(*paxdata + cnvp + innvplen - cnvplen, *paxdata + cnvp + cnvplen, (*paxdata + *paxlen) - (*paxdata + cnvp + cnvplen));
memcpy(*paxdata + cnvp, nvpline, innvplen);
}
else if (innvplen < cnvplen) {
memmove(*paxdata + cnvp + innvplen, *paxdata + cnvp + cnvplen, (*paxdata + *paxlen) - (*paxdata + cnvp + cnvplen));
memcpy(*paxdata + cnvp, nvpline, innvplen);
*paxlen = *paxlen + (innvplen - cnvplen);
*paxdata = drealloc(*paxdata, *paxlen);
}
else {
memcpy(*paxdata + cnvp, nvpline, innvplen);
}
foundit = 1;
break;
}
cnvp += cnvplen;
}
if (foundit == 0) {
*paxdata = drealloc(*paxdata, *paxlen + innvplen);
memcpy(*paxdata + *paxlen, nvpline, innvplen);
*paxlen = *paxlen + innvplen;
}
free(nvpline);
return(0);
}
int delpaxvar(char **paxdata, int *paxlen, char *inname) {
char *cnvp = *paxdata;
int cnvplen;
char *cname;
int cnamelen;
char *cvalue;
while (cnvp < *paxdata + *paxlen) {
cnvplen = strtol(cnvp, &cname, 10);
cname++;
cvalue = strchr(cname, '=');
cnamelen = cvalue - cname;
cvalue++;
if (cnamelen >= strlen(inname) && strncmp(inname, cname, cnamelen) == 0) {
memmove(cnvp, cnvp + cnvplen, (*paxdata + *paxlen) - (cnvp + cnvplen));
*paxlen = *paxlen - cnvplen;
// *paxdata = drealloc(*paxdata, *paxlen);
break;
}
cnvp += cnvplen;
}
return(0);
}
// Returns the integer log of n
unsigned int ilog10(unsigned long long int n) {
static unsigned long long int lt[20];
static int s = 0;
int min = 0;
int max = sizeof(lt) / sizeof(*lt) - 1;
int mid;
int i;
unsigned long long int j = 1;
if (s == 0) {
for (i = 1; i <= 19; i++) {
lt[i - 1] = j;
j *= 10;
}
lt[19] = 0xffffffffffffffff;
}
s = 1;
if (n == 0)
return(0);
while (max >= min) {
mid = (int) (((min + max) / 2));
if (n >= lt[min] && n < lt[mid]) {
if (min + 1 == mid)
return(min);
else
max = mid;
}
else if (n >= lt[mid] && (n < 0xffffffffffffffff ? n < lt[max] : n <= lt[max])) {
if (mid + 1 == max)
return(mid);
else
min = mid;
}
}
return(0);
}
int cpypaxvarstr(char *paxdata, int paxlen, char *name, char **target)
{
int len = 0;
char *value = NULL;
int r;
r = getpaxvar(paxdata, paxlen, name, &value, &len);
if (r == 0) {
strncpya0(target, value, len);
for (int i = strlen(*target); i > 0; i--)
if ((*target)[i] == '\n') {
(*target)[i] = '\0';
break;
}
}
else
strncpya0(target, "", 0);
return(r);
}
// malloc that records size of allocated memory segment
void *dmalloc(size_t size)
{
void *b;
b = malloc(size + sizeof(size_t));
*(size_t *)b = size;
return(b + sizeof(size_t));
}
// Matching free function for dmalloc
void dfree(void *b)
{
if (b != NULL)
free(b - sizeof(size_t));
}
// Matching realloc function for dmalloc
void *drealloc(void *b, size_t size)
{
void *r;
if (b == NULL)
return(dmalloc(size));
r = realloc(b - sizeof(size_t), size + sizeof(size_t));
*(size_t *)r = size;
return(r + sizeof(size_t));
}
// Returns size of memory allocated by dmalloc
size_t dmalloc_size(void *b)
{
if (b != NULL)
return(*((size_t *) (b - sizeof(size_t))));
return(0);
}
/* auto-allocating version of strncpy
* always leaves a null terminator
* *dest must be either NULL, or allocated via dmalloc();
*/
char *strncpya0(char **dest, const char *src, size_t n)
{
if (n == 0)
n = strlen(src);
if (*dest == NULL)
*dest = dmalloc(n + 1);
if (dmalloc_size(*dest) < n + 1)
*dest = drealloc(*dest, n + 1);
strncpy(*dest, src, n);
(*dest)[n] = '\0';
return(*dest);
}
char *strcata(char **dest, const char *src)
{
if (*dest == NULL) {
*dest = dmalloc(strlen(src) + 1);
((char *)(*dest))[0] = 0;
}
if (dmalloc_size(*dest) < strlen(*dest) + strlen(src) + 1)
*dest = drealloc(*dest, strlen(*dest) + strlen(src) + 1);
strcat(*dest, src);
return(*dest);
}
char *strncata0(char **dest, const char *src, size_t n)
{
size_t o = *dest == NULL ? 0 : strlen(*dest);
size_t b = strnlen(src, n) >= n ? n : strlen(src);
if (*dest == NULL) {
*dest = dmalloc(b + 1);
((char *)(*dest))[0] = 0;
}
if (dmalloc_size(*dest) < strlen(*dest) + b + 1)
*dest = drealloc(*dest, strlen(*dest) + b + 1);
strncat(*dest, src, n);
(*dest)[o + b] = '\0';
return(*dest);
}
/* auto-allocating version of memcpy
* *dest must be either NULL, or allocated via dmalloc();
*/
void *memcpya(void **dest, void *src, size_t n)
{
if (*dest == NULL)
*dest = dmalloc(n);
if (dmalloc_size(*dest) < n)
*dest = drealloc(*dest, n);
memcpy(*dest, src, n);
return(*dest);
}
/* auto-allocating version of memcpy with offset
* *dest must be either NULL, or allocated via dmalloc();
*/
void *memcpyao(void **dest, void *src, size_t n, size_t offset)
{
if (*dest == NULL)
*dest = dmalloc(n + offset);
if (dmalloc_size(*dest) < n + offset)
*dest = drealloc(*dest, n + offset);
memcpy((*dest) + offset, src, n);
return(*dest);
}
// Initialize filespec structure
int fsinit(struct filespec *fs)
{
memset(fs, 0, sizeof(struct filespec));
fs->ftype = 0;
fs->mode = 0;
fs->devid[0] = 0;
fs->inode[0] = 0;
fs->auid[0] = 0;
fs->nuid = 0;
fs->agid[0] = 0;
fs->ngid = 0;
fs->filesize = 0;
fs->sparse_realsize = 0;
fs->modtime = 0;
fs->filename = dmalloc(100);
fs->linktarget = dmalloc(100);
fs->xheader = dmalloc(100);
fs->xheaderlen = 0;
fs->sparsedata = dmalloc(sizeof(fs->sparsedata) * 4);
fs->n_sparsedata = 0;
fs->pax = 0;
fsclear(fs);
return(0);
}
// Zero out filespec structure
int fsclear(struct filespec *fs)
{
fs->ftype = 0;
fs->mode = 0;
fs->devid[0] = 0;
fs->inode[0] = 0;
fs->auid[0] = 0;
fs->nuid = 0;
fs->agid[0] = 0;
fs->ngid = 0;
fs->filesize = 0;
fs->sparse_realsize = 0;
fs->modtime = 0;
if (fs->filename != NULL)
fs->filename[0] = 0;
if (fs->linktarget != NULL)
fs->linktarget[0] = 0;
if (fs->xheaderlen > 0)
fs->xheader[0] = 0;
fs->xheaderlen = 0;
fs->n_sparsedata = 0;
fs->pax = 0;
return(0);
}
// Make a copy of a filespec data structure
int fsdup(struct filespec *tsf, struct filespec *sfs)
{
tsf->ftype = sfs->ftype;
tsf->mode = sfs->mode;
memcpy(tsf->devid, sfs->devid, 33);
memcpy(tsf->inode, sfs->inode, 33);
memcpy(tsf->auid, sfs->auid, 33);
tsf->nuid = sfs->nuid;
memcpy(tsf->agid, sfs->agid, 33);
tsf->ngid = sfs->ngid;
tsf->filesize = sfs->filesize;
tsf->sparse_realsize = sfs->sparse_realsize;
tsf->modtime = sfs->modtime;
memcpy(tsf->agid, sfs->agid, 33);
strncpya0(&(tsf->filename), sfs->filename, strlen(sfs->filename));
strncpya0(&(tsf->linktarget), sfs->linktarget, strlen(sfs->linktarget));
memcpya((void **) &(tsf->xheader), sfs->xheader, sfs->xheaderlen);
tsf->xheaderlen = sfs->xheaderlen;
memcpya((void **) &(tsf->sparsedata), sfs->sparsedata, sizeof(struct sparsedata) * sfs->n_sparsedata);
tsf->n_sparsedata = sfs->n_sparsedata;
tsf->pax = sfs->pax;
tsf->io_func = sfs->io_func;
tsf->io_handle = sfs->io_handle;
return(0);
}
// Free a filespec data structure
int fsfree(struct filespec *fs)
{
fsclear(fs);
dfree(fs->filename);
dfree(fs->linktarget);
dfree(fs->xheader);
dfree(fs->sparsedata);
fs->filename = NULL;
fs->linktarget = NULL;