int main(int argc, char *argv[], char *env[]){
#define AOUT_DIR "/usr/lib/cgi-bin/testuidgid.txt"
FILE *f = NULL;
char fopenModus[2] = {};
char username[255];
long int uidresult[] = {0};
long int gidresult[] = {0};
long int uidowner[] = {0};
long int gidowner[] = {0};
long int fileprotection[] = {0};
int filedesc;
//check if 2 arguments are set
if (argc != 2){
perror("Funktionsargument fehlt: <username>");
}
//get arguments from shell
if (argv[1] != 0){
strcpy (username, argv[1]);
}
if (access(AOUT_DIR, (R_OK | W_OK)) != -1) {
sprintf(fopenModus, "r+");
} else {
sprintf(fopenModus, "w");
}
f = fopen(AOUT_DIR, fopenModus);
fprintf(f,
"Test Text: uid gid!!\n");
fclose(f);
// Check if file has the defined uid (user ID) and gid (group ID)!
// getinfofile(int *filedescr, uid_t *uidowner, gid_t *gidowner, mode_t *fileprotection);
filedesc = open(AOUT_DIR, O_RDWR);
getinfofile(&filedesc, uidowner, gidowner, fileprotection);
// printf("getinfofile call: \n uidowner : %li\n gidowner : %li\n fileprotection : %lo\n", uidowner[0], gidowner[0], fileprotection[0]);
// getuidinfo(char *name, long int *uidresult, long int *gidresult);
getuidbyname(username, uidresult, gidresult);
// printf("Result of function call:\n uid : %li\n gid : %li\n", uidresult[0], gidresult[0]);
if ((uidowner[0] != uidresult[0]) || (gidowner[0] != gidresult[0])){
if ((fchown(filedesc, uidresult[0], gidresult[0])) != 0){
fprintf(stderr, "init_AOUT (LTC2635): Change owner of %s error: %s\n",AOUT_DIR, strerror(errno));
}
}
close(filedesc);
return 0;
}
void
read_in_tar_header (struct cpio_file_stat *file_hdr, int in_des)
{
long bytes_skipped = 0;
int warned = false;
union tar_record tar_rec;
struct tar_header *tar_hdr = (struct tar_header *) &tar_rec;
uid_t *uidp;
gid_t *gidp;
tape_buffered_read ((char *) &tar_rec, in_des, TARRECORDSIZE);
/* Check for a block of 0's. */
if (null_block ((long *) &tar_rec, TARRECORDSIZE))
{
#if 0
/* Found one block of 512 0's. If the next block is also all 0's
then this is the end of the archive. If not, assume the
previous block was all corruption and continue reading
the archive. */
/* Commented out because GNU tar sometimes creates archives with
only one block of 0's at the end. This happened for the
cpio 2.0 distribution! */
tape_buffered_read ((char *) &tar_rec, in_des, TARRECORDSIZE);
if (null_block ((long *) &tar_rec, TARRECORDSIZE))
#endif
{
file_hdr->c_name = CPIO_TRAILER_NAME;
return;
}
#if 0
bytes_skipped = TARRECORDSIZE;
#endif
}
while (1)
{
file_hdr->c_chksum = FROM_OCTAL (tar_hdr->chksum);
if (file_hdr->c_chksum != tar_checksum (tar_hdr))
{
/* If the checksum is bad, skip 1 byte and try again. When
we try again we do not look for an EOF record (all zeros),
because when we start skipping bytes in a corrupted archive
the chances are pretty good that we might stumble across
2 blocks of 512 zeros (that probably is not really the last
record) and it is better to miss the EOF and give the user
a "premature EOF" error than to give up too soon on a corrupted
archive. */
if (!warned)
{
error (0, 0, _("invalid header: checksum error"));
warned = true;
}
memmove (&tar_rec, ((char *) &tar_rec) + 1, TARRECORDSIZE - 1);
tape_buffered_read (((char *) &tar_rec) + (TARRECORDSIZE - 1), in_des, 1);
++bytes_skipped;
continue;
}
if (archive_format != arf_ustar)
file_hdr->c_name = stash_tar_filename (NULL, tar_hdr->name);
else
file_hdr->c_name = stash_tar_filename (tar_hdr->prefix, tar_hdr->name);
file_hdr->c_nlink = 1;
file_hdr->c_mode = FROM_OCTAL (tar_hdr->mode);
file_hdr->c_mode = file_hdr->c_mode & 07777;
/* Debian hack: This version of cpio uses the -n flag also to extract
tar archives using the numeric UID/GID instead of the user/group
names in /etc/passwd and /etc/groups. (98/10/15) -BEM */
if (archive_format == arf_ustar && !numeric_uid
&& (uidp = getuidbyname (tar_hdr->uname)))
file_hdr->c_uid = *uidp;
else
file_hdr->c_uid = FROM_OCTAL (tar_hdr->uid);
if (archive_format == arf_ustar && !numeric_uid
&& (gidp = getgidbyname (tar_hdr->gname)))
file_hdr->c_gid = *gidp;
else
file_hdr->c_gid = FROM_OCTAL (tar_hdr->gid);
file_hdr->c_filesize = FROM_OCTAL (tar_hdr->size);
file_hdr->c_mtime = FROM_OCTAL (tar_hdr->mtime);
file_hdr->c_rdev_maj = FROM_OCTAL (tar_hdr->devmajor);
file_hdr->c_rdev_min = FROM_OCTAL (tar_hdr->devminor);
file_hdr->c_tar_linkname = NULL;
switch (tar_hdr->typeflag)
{
case REGTYPE:
case CONTTYPE: /* For now, punt. */
default:
file_hdr->c_mode |= CP_IFREG;
break;
case DIRTYPE:
file_hdr->c_mode |= CP_IFDIR;
break;
case CHRTYPE:
file_hdr->c_mode |= CP_IFCHR;
/* If a POSIX tar header has a valid linkname it's always supposed
to set typeflag to be LNKTYPE. System V.4 tar seems to
be broken, and for device files with multiple links it
puts the name of the link into linkname, but leaves typeflag
as CHRTYPE, BLKTYPE, FIFOTYPE, etc. */
file_hdr->c_tar_linkname = stash_tar_linkname (tar_hdr->linkname);
/* Does POSIX say that the filesize must be 0 for devices? We
assume so, but HPUX's POSIX tar sets it to be 1 which causes
us problems (when reading an archive we assume we can always
skip to the next file by skipping filesize bytes). For
now at least, it's easier to clear filesize for devices,
rather than check everywhere we skip in copyin.c. */
file_hdr->c_filesize = 0;
break;
case BLKTYPE:
file_hdr->c_mode |= CP_IFBLK;
file_hdr->c_tar_linkname = stash_tar_linkname (tar_hdr->linkname);
file_hdr->c_filesize = 0;
break;
#ifdef CP_IFIFO
case FIFOTYPE:
file_hdr->c_mode |= CP_IFIFO;
file_hdr->c_tar_linkname = stash_tar_linkname (tar_hdr->linkname);
file_hdr->c_filesize = 0;
break;
#endif
case SYMTYPE:
#ifdef CP_IFLNK
file_hdr->c_mode |= CP_IFLNK;
file_hdr->c_tar_linkname = stash_tar_linkname (tar_hdr->linkname);
file_hdr->c_filesize = 0;
break;
/* Else fall through. */
#endif
case LNKTYPE:
file_hdr->c_mode |= CP_IFREG;
file_hdr->c_tar_linkname = stash_tar_linkname (tar_hdr->linkname);
file_hdr->c_filesize = 0;
break;
case AREGTYPE:
/* Old tar format; if the last char in filename is '/' then it is
a directory, otherwise it's a regular file. */
if (file_hdr->c_name[strlen (file_hdr->c_name) - 1] == '/')
file_hdr->c_mode |= CP_IFDIR;
else
file_hdr->c_mode |= CP_IFREG;
break;
}
break;
}
if (bytes_skipped > 0)
warn_junk_bytes (bytes_skipped);
}
