/*
** Copyright 1998-2003 University of Illinois Board of Trustees
** Copyright 1998-2003 Mark D. Roth
** All rights reserved.
**
** append.c - libtar code to append files to a tar archive
**
** Mark D. Roth <roth@uiuc.edu>
** Campus Information Technologies and Educational Services
** University of Illinois at Urbana-Champaign
*/
#include <internal.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/types.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <string.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SELINUX
#include "selinux/selinux.h"
#endif
struct tar_dev
{
dev_t td_dev;
libtar_hash_t *td_h;
};
typedef struct tar_dev tar_dev_t;
struct tar_ino
{
ino_t ti_ino;
char ti_name[MAXPATHLEN];
};
typedef struct tar_ino tar_ino_t;
/* free memory associated with a tar_dev_t */
void
tar_dev_free(tar_dev_t *tdp)
{
libtar_hash_free(tdp->td_h, free);
free(tdp);
}
/* appends a file to the tar archive */
int
tar_append_file(TAR *t, char *realname, char *savename)
{
struct stat s;
int i;
libtar_hashptr_t hp;
tar_dev_t *td = NULL;
tar_ino_t *ti = NULL;
char path[MAXPATHLEN];
#ifdef DEBUG
printf("==> tar_append_file(TAR=0x%lx (\"%s\"), realname=\"%s\", "
"savename=\"%s\")\n", t, t->pathname, realname,
(savename ? savename : "[NULL]"));
#endif
if (lstat(realname, &s) != 0)
{
#ifdef DEBUG
perror("lstat()");
#endif
return -1;
}
/* set header block */
#ifdef DEBUG
puts(" tar_append_file(): setting header block...");
#endif
memset(&(t->th_buf), 0, sizeof(struct tar_header));
th_set_from_stat(t, &s);
/* set the header path */
#ifdef DEBUG
puts(" tar_append_file(): setting header path...");
#endif
th_set_path(t, (savename ? savename : realname));
#ifdef HAVE_SELINUX
/* get selinux context */
if(t->options & TAR_STORE_SELINUX) {
if(t->th_buf.selinux_context != NULL) {
free(t->th_buf.selinux_context);
t->th_buf.selinux_context = NULL;
}
security_context_t selinux_context = NULL;
if (lgetfilecon(realname, &selinux_context) >= 0) {
t->th_buf.selinux_context = strdup(selinux_context);
printf("setting selinux context: %s\n", selinux_context);
freecon(selinux_context);
}
else
perror("Failed to get selinux context");
}
#endif
/* check if it's a hardlink */
#ifdef DEBUG
puts(" tar_append_file(): checking inode cache for hardlink...");
#endif
libtar_hashptr_reset(&hp);
if (libtar_hash_getkey(t->h, &hp, &(s.st_dev),
(libtar_matchfunc_t)dev_match) != 0)
td = (tar_dev_t *)libtar_hashptr_data(&hp);
else
{
#ifdef DEBUG
printf("+++ adding hash for device (0x%lx, 0x%lx)...\n",
major(s.st_dev), minor(s.st_dev));
#endif
td = (tar_dev_t *)calloc(1, sizeof(tar_dev_t));
td->td_dev = s.st_dev;
td->td_h = libtar_hash_new(256, (libtar_hashfunc_t)ino_hash);
if (td->td_h == NULL)
return -1;
if (libtar_hash_add(t->h, td) == -1)
return -1;
}
libtar_hashptr_reset(&hp);
if (libtar_hash_getkey(td->td_h, &hp, &(s.st_ino),
(libtar_matchfunc_t)ino_match) != 0)
{
ti = (tar_ino_t *)libtar_hashptr_data(&hp);
#ifdef DEBUG
printf(" tar_append_file(): encoding hard link \"%s\" "
"to \"%s\"...\n", realname, ti->ti_name);
#endif
t->th_buf.typeflag = LNKTYPE;
th_set_link(t, ti->ti_name);
}
else
{
#ifdef DEBUG
printf("+++ adding entry: device (0x%lx,0x%lx), inode %ld "
"(\"%s\")...\n", major(s.st_dev), minor(s.st_dev),
s.st_ino, realname);
#endif
ti = (tar_ino_t *)calloc(1, sizeof(tar_ino_t));
if (ti == NULL)
return -1;
ti->ti_ino = s.st_ino;
snprintf(ti->ti_name, sizeof(ti->ti_name), "%s",
savename ? savename : realname);
libtar_hash_add(td->td_h, ti);
}
/* check if it's a symlink */
if (TH_ISSYM(t))
{
i = readlink(realname, path, sizeof(path));
if (i == -1)
return -1;
if (i >= MAXPATHLEN)
i = MAXPATHLEN - 1;
path[i] = '\0';
#ifdef DEBUG
printf(" tar_append_file(): encoding symlink \"%s\" -> "
"\"%s\"...\n", realname, path);
#endif
th_set_link(t, path);
}
/* print file info */
if (t->options & TAR_VERBOSE)
th_print_long_ls(t);
#ifdef DEBUG
puts(" tar_append_file(): writing header");
#endif
/* write header */
if (th_write(t) != 0)
{
#ifdef DEBUG
printf("t->fd = %d\n", t->fd);
#endif
return -1;
}
#ifdef DEBUG
puts(" tar_append_file(): back from th_write()");
#endif
/* if it's a regular file, write the contents as well */
if (TH_ISREG(t) && tar_append_regfile(t, realname) != 0)
return -1;
return 0;
}
/* write EOF indicator */
int
tar_append_eof(TAR *t)
{
int i, j;
char block[T_BLOCKSIZE];
memset(&block, 0, T_BLOCKSIZE);
for (j = 0; j < 2; j++)
{
i = tar_block_write(t, &block);
if (i != T_BLOCKSIZE)
{
if (i != -1)
errno = EINVAL;
return -1;
}
}
return 0;
}
/* add file contents to a tarchive */
int
tar_append_regfile(TAR *t, char *realname)
{
char block[T_BLOCKSIZE];
int filefd;
int i, j;
size_t size;
filefd = open(realname, O_RDONLY);
if (filefd == -1)
{
#ifdef DEBUG
perror("open()");
#endif
return -1;
}
size = th_get_size(t);
for (i = size; i > T_BLOCKSIZE; i -= T_BLOCKSIZE)
{
j = read(filefd, &block, T_BLOCKSIZE);
if (j != T_BLOCKSIZE)
{
if (j != -1)
errno = EINVAL;
return -1;
}
if (tar_block_write(t, &block) == -1)
return -1;
}
if (i > 0)
{
j = read(filefd, &block, i);
if (j == -1)
return -1;
memset(&(block[i]), 0, T_BLOCKSIZE - i);
if (tar_block_write(t, &block) == -1)
return -1;
}
close(filefd);
return 0;
}
