int do_unpack(void)
{
struct file_header untrusted_hdr;
#ifdef HAVE_SYNCFS
int cwd_fd;
int saved_errno;
#endif
total_bytes = total_files = 0;
/* 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;
}
total_files++;
if (files_limit && total_files > files_limit)
do_exit(EDQUOT, untrusted_namebuf);
process_one_file(&untrusted_hdr);
}
#ifdef HAVE_SYNCFS
saved_errno = errno;
cwd_fd = open(".", O_RDONLY);
if (cwd_fd >= 0 && syncfs(cwd_fd) == 0 && close(cwd_fd) == 0)
errno = saved_errno;
#endif
send_status_and_crc(errno, untrusted_namebuf);
return errno;
}
void process_one_file_link(struct file_header *untrusted_hdr,
const char *untrusted_name)
{
char untrusted_content[MAX_PATH_LENGTH];
unsigned int filelen;
if (untrusted_hdr->filelen > MAX_PATH_LENGTH - 1)
do_exit(ENAMETOOLONG, untrusted_name);
filelen = untrusted_hdr->filelen; /* sanitized above */
total_bytes += filelen;
if (bytes_limit && total_bytes > bytes_limit)
do_exit(EDQUOT, untrusted_name);
if (!read_all_with_crc(0, untrusted_content, filelen))
do_exit(LEGAL_EOF, untrusted_name); // hopefully remote has produced error message
untrusted_content[filelen] = 0;
if (symlink(untrusted_content, untrusted_name)) /* safe because of chroot */
do_exit(errno, untrusted_name);
}
void process_one_file(struct file_header *untrusted_hdr)
{
unsigned int namelen;
if (untrusted_hdr->namelen > MAX_PATH_LENGTH - 1)
do_exit(ENAMETOOLONG, NULL); /* filename too long so not received at all */
namelen = untrusted_hdr->namelen; /* sanitized above */
if (!read_all_with_crc(0, untrusted_namebuf, namelen))
do_exit(LEGAL_EOF, NULL); // 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, untrusted_namebuf);
if (verbose && !S_ISDIR(untrusted_hdr->mode))
fprintf(stderr, "%s\n", untrusted_namebuf);
}
int do_unpack(void)
{
struct file_header untrusted_hdr;
total_bytes = total_files = 0;
/* 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;
}
total_files++;
if (files_limit && total_files > files_limit)
do_exit(EDQUOT, untrusted_namebuf);
process_one_file(&untrusted_hdr);
}
send_status_and_crc(errno, untrusted_namebuf);
return errno;
}
