LXR busybox/archival/libarchive/unsafe_symlink

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   4 */
   5#include "libbb.h"
   6#include "bb_archive.h"
   7
   8void FAST_FUNC create_or_remember_link(llist_t **link_placeholders,
   9                const char *target,
  10                const char *linkname,
  11                int hard_link)
  12{
  13        if (hard_link || target[0] == '/' || strstr(target, "..")) {
  14                llist_add_to_end(link_placeholders,
  15                        xasprintf("%c%s%c%s", hard_link, linkname, '\0', target)
  16                );
  17                return;
  18        }
  19        if (symlink(target, linkname) != 0) {
  20                /* shared message */
  21                bb_perror_msg_and_die("can't create %slink '%s' to '%s'",
  22                        "sym", linkname, target
  23                );
  24        }
  25}
  26
  27void FAST_FUNC create_links_from_list(llist_t *list)
  28{
  29        while (list) {
  30                char *target;
  31
  32                target = list->data + 1 + strlen(list->data + 1) + 1;
  33                if ((*list->data ? link : symlink) (target, list->data + 1)) {
  34                        /* shared message */
  35                        bb_error_msg_and_die("can't create %slink '%s' to '%s'",
  36                                *list->data ? "hard" : "sym",
  37                                list->data + 1, target
  38                        );
  39                }
  40                list = list->link;
  41        }
  42}
  43