diff options
Diffstat (limited to 'archival/libunarchive/get_header_tar.c')
| -rw-r--r-- | archival/libunarchive/get_header_tar.c | 65 |
1 files changed, 45 insertions, 20 deletions
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c index 68f7b2b..0fb14e8 100644 --- a/archival/libunarchive/get_header_tar.c +++ b/archival/libunarchive/get_header_tar.c @@ -14,9 +14,14 @@ #include "libbb.h" #include "unarchive.h" -#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS -static char *longname = NULL; -static char *linkname = NULL; +#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS +static char *longname; +static char *linkname; +#else +enum { + longname = 0, + linkname = 0, +}; #endif /* NB: _DESTROYS_ str[len] character! */ @@ -64,6 +69,11 @@ char get_header_tar(archive_handle_t *archive_handle) } tar; char *cp; int sum, i; +#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS + int parse_names; +#else + enum { parse_names = 0 }; +#endif if (sizeof(tar) != 512) BUG_tar_header_size(); @@ -93,7 +103,7 @@ char get_header_tar(archive_handle_t *archive_handle) * 0's are for the old tar format */ if (strncmp(tar.magic, "ustar", 5) != 0) { -#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY +#if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY if (memcmp(tar.magic, "\0\0\0\0", 5) != 0) #endif bb_error_msg_and_die("invalid tar magic"); @@ -111,6 +121,10 @@ char get_header_tar(archive_handle_t *archive_handle) bb_error_msg_and_die("invalid tar header checksum"); } +#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS + parse_names = (tar.typeflag != 'L' && tar.typeflag != 'K'); +#endif + /* getOctal trashes subsequent field, therefore we call it * on fields in reverse order */ #define GET_OCTAL(a) getOctal((a), sizeof(a)) @@ -119,27 +133,24 @@ char get_header_tar(archive_handle_t *archive_handle) unsigned major = GET_OCTAL(tar.devmajor); file_header->device = makedev(major, minor); } + file_header->link_name = NULL; + if (!linkname && parse_names && tar.linkname[0]) { + /* we trash magic[0] here, it's ok */ + tar.linkname[sizeof(tar.linkname)] = '\0'; + file_header->link_name = xstrdup(tar.linkname); + /* FIXME: what if we have non-link object with link_name? */ + /* Will link_name be free()ed? */ + } file_header->mtime = GET_OCTAL(tar.mtime); file_header->size = GET_OCTAL(tar.size); file_header->gid = GET_OCTAL(tar.gid); file_header->uid = GET_OCTAL(tar.uid); - file_header->link_name = !tar.linkname[0] ? NULL : - xstrndup(tar.linkname, sizeof(tar.linkname)); /* Set bits 0-11 of the files mode */ file_header->mode = 07777 & GET_OCTAL(tar.mode); #undef GET_OCTAL -#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS - if (longname) { - file_header->name = longname; - longname = NULL; - } - else if (linkname) { - file_header->name = linkname; - linkname = NULL; - } else -#endif - { /* we trash mode[0] here, it's ok */ + if (!longname && parse_names) { + /* we trash mode[0] here, it's ok */ tar.name[sizeof(tar.name)] = '\0'; if (tar.prefix[0]) file_header->name = concat_path_file(tar.prefix, tar.name); @@ -148,6 +159,7 @@ char get_header_tar(archive_handle_t *archive_handle) } /* Set bits 12-15 of the files mode */ + /* (typeflag was not trashed because chksum does not use getOctal) */ switch (tar.typeflag) { /* busybox identifies hard links as being regular files with 0 size and a link name */ case '1': @@ -157,7 +169,7 @@ char get_header_tar(archive_handle_t *archive_handle) /* Reserved for high performance files, treat as normal file */ case 0: case '0': -#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY +#if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY if (last_char_is(file_header->name, '/')) { file_header->mode |= S_IFDIR; } else @@ -179,17 +191,19 @@ char get_header_tar(archive_handle_t *archive_handle) case '6': file_header->mode |= S_IFIFO; break; -#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS +#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS case 'L': + /* paranoia: tar with several consecutive longnames */ + free(longname); longname = xzalloc(file_header->size + 1); xread(archive_handle->src_fd, longname, file_header->size); archive_handle->offset += file_header->size; return get_header_tar(archive_handle); case 'K': + free(linkname); linkname = xzalloc(file_header->size + 1); xread(archive_handle->src_fd, linkname, file_header->size); archive_handle->offset += file_header->size; - file_header->name = linkname; return get_header_tar(archive_handle); case 'D': /* GNU dump dir */ case 'M': /* Continuation of multi volume archive */ @@ -205,6 +219,17 @@ char get_header_tar(archive_handle_t *archive_handle) bb_error_msg("unknown typeflag: 0x%x", tar.typeflag); } +#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS + if (longname) { + file_header->name = longname; + longname = NULL; + } + if (linkname) { + file_header->link_name = linkname; + linkname = NULL; + } +#endif + /* Strip trailing '/' in directories */ /* Must be done after mode is set as '/' is used to check if its a directory */ cp = last_char_is(file_header->name, '/'); |