Don't truncate long symlink paths.

Patch from Richard Purdie. Tracked as Issue #72. Original patch header follows.

If a tarball contains a long symlink (over 100 chars) in a longpath (over 100
chars) then the resulting link or path can be truncated to 100 chars.

This is due to a bug where if both 'L' and 'K' entries are found in the tarball,
only the first one takes affect due to get_header_tar recursively calling itself.
To fix this, process longname and linkname at the end of the function rather
than the start after any subcalls have taken place.

Richard Purdie
22/12/2010

git-svn-id: http://opkg.googlecode.com/svn/trunk@594 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358

diff --git a/libbb/unarchive.c b/libbb/unarchive.c
index 1d152f5eb6af0b65bb83d09e917a19c96d5dc81a..5d4464f3c4632ca7c6b8842eb3b6543b62d7620d 100644 (file)
--- a/libbb/unarchive.c
+++ b/libbb/unarchive.c
@@ -506,23 +506,7 @@ get_header_tar(FILE *tar_stream)
        /* convert to type'ed variables */
        tar_entry = xcalloc(1, sizeof(file_header_t));
 
-#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
-        if (longname) {
-                tar_entry->name = longname;
-                longname = NULL;
-        } else
-#endif
-        {
-                tar_entry->name = xstrndup(tar.formated.name, 100);
 
-                if (tar.formated.prefix[0]) {
-                        char *temp = tar_entry->name;
-                        char *prefixTemp = xstrndup(tar.formated.prefix, 155);
-                        tar_entry->name = concat_path_file(prefixTemp, temp);
-                        free(temp);
-                        free(prefixTemp);
-                }
-        }
 
        // tar_entry->name = xstrdup(tar.formated.name);
 
@@ -535,16 +519,7 @@ get_header_tar(FILE *tar_stream)
        tar_entry->gid   = strtol(tar.formated.gid, NULL, 8);
        tar_entry->size  = strtol(tar.formated.size, NULL, 8);
        tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
-#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
-       if (linkname) {
-               tar_entry->link_name = linkname;
-               linkname = NULL;
-       } else
-#endif
-       {
-               tar_entry->link_name = *tar.formated.linkname != '\0' ?
-                       xstrndup(tar.formated.linkname, 100) : NULL;
-       }
+
        tar_entry->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) +
                strtol(tar.formated.devminor, NULL, 8);
 
@@ -611,6 +586,34 @@ get_header_tar(FILE *tar_stream)
 
        }
 
+
+#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
+        if (longname) {
+                tar_entry->name = longname;
+                longname = NULL;
+        } else
+#endif
+        {
+                tar_entry->name = xstrndup(tar.formated.name, 100);
+
+                if (tar.formated.prefix[0]) {
+                        char *temp = tar_entry->name;
+                        char *prefixTemp = xstrndup(tar.formated.prefix, 155);
+                        tar_entry->name = concat_path_file(prefixTemp, temp);
+                        free(temp);
+                        free(prefixTemp);
+                }
+        }
+
+       if (linkname) {
+               tar_entry->link_name = linkname;
+               linkname = NULL;
+       } else
+       {
+               tar_entry->link_name = *tar.formated.linkname != '\0' ?
+                       xstrndup(tar.formated.linkname, 100) : NULL;
+       }
+
        return(tar_entry);
 }