extern char get_header_tar(archive_handle_t *archive_handle) { file_header_t *file_header = archive_handle->file_header; union { unsigned char raw[512]; struct { char name[100]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ char linkname[100]; /* 157-256 */ char magic[6]; /* 257-262 */ char version[2]; /* 263-264 */ char uname[32]; /* 265-296 */ char gname[32]; /* 297-328 */ char devmajor[8]; /* 329-336 */ char devminor[8]; /* 337-344 */ char prefix[155]; /* 345-499 */ char padding[12]; /* 500-512 */ } formated; } tar; long sum = 0; long i; char *tmp; /* Align header */ data_align(archive_handle, 512); if (archive_xread(archive_handle, tar.raw, 512) != 512) { /* Assume end of file */ return(EXIT_FAILURE); } archive_handle->offset += 512; /* If there is no filename its an empty header */ if (tar.formated.name[0] == 0) { return(EXIT_SUCCESS); } /* Check header has valid magic, "ustar" is for the proper tar * 0's are for the old tar format */ if (strncmp(tar.formated.magic, "ustar", 5) != 0) { #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0) #endif bb_error_msg_and_die("Invalid tar magic"); } /* Do checksum on headers */ for (i = 0; i < 148 ; i++) { sum += tar.raw[i]; } sum += ' ' * 8; for (i = 156; i < 512 ; i++) { sum += tar.raw[i]; } if (sum != strtol(tar.formated.chksum, NULL, 8)) { bb_error_msg("Invalid tar header checksum"); return(EXIT_FAILURE); } #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 if (tar.formated.prefix[0] == 0) { file_header->name = strdup(tar.formated.name); } else { file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name); } tmp = last_char_is(archive_handle->file_header->name, '/'); if (tmp) { *tmp = '\0'; } file_header->mode = strtol(tar.formated.mode, NULL, 8); file_header->uid = strtol(tar.formated.uid, NULL, 8); file_header->gid = strtol(tar.formated.gid, NULL, 8); file_header->size = strtol(tar.formated.size, NULL, 8); file_header->mtime = strtol(tar.formated.mtime, NULL, 8); file_header->link_name = (tar.formated.linkname[0] != '\0') ? bb_xstrdup(tar.formated.linkname) : NULL; file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) + strtol(tar.formated.devminor, NULL, 8)); if (tar.formated.typeflag == '1') { bb_error_msg("WARNING: Converting hard link to symlink"); file_header->mode |= S_IFLNK; } #if defined CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY || defined CONFIG_FEATURE_TAR_GNU_EXTENSIONS /* Fix mode, used by the old format */ switch (tar.formated.typeflag) { # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY case 0: case '0': file_header->mode |= S_IFREG; break; case '1': // bb_error_msg("Internal hard link not supported"); break; case '2': file_header->mode |= S_IFLNK; break; case '3': file_header->mode |= S_IFCHR; break; case '4': file_header->mode |= S_IFBLK; break; case '5': file_header->mode |= S_IFDIR; break; case '6': file_header->mode |= S_IFIFO; break; # endif # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS case 'L': { longname = xmalloc(file_header->size + 1); archive_xread_all(archive_handle, longname, file_header->size); longname[file_header->size] = '\0'; archive_handle->offset += file_header->size; return(get_header_tar(archive_handle)); } case 'K': { linkname = xmalloc(file_header->size + 1); archive_xread_all(archive_handle, linkname, file_header->size); linkname[file_header->size] = '\0'; archive_handle->offset += file_header->size; file_header->name = linkname; return(get_header_tar(archive_handle)); } case 'D': case 'M': case 'N': case 'S': case 'V': bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag); # endif } #endif if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { archive_handle->action_header(archive_handle->file_header); archive_handle->flags |= ARCHIVE_EXTRACT_QUIET; archive_handle->action_data(archive_handle); archive_handle->passed = llist_add_to(archive_handle->passed, archive_handle->file_header->name); } else { data_skip(archive_handle); } archive_handle->offset += file_header->size; return(EXIT_SUCCESS); }
char get_header_tar(archive_handle_t *archive_handle) { static int end; file_header_t *file_header = archive_handle->file_header; struct { /* ustar header, Posix 1003.1 */ char name[100]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ char linkname[100]; /* 157-256 */ char magic[6]; /* 257-262 */ char version[2]; /* 263-264 */ char uname[32]; /* 265-296 */ char gname[32]; /* 297-328 */ char devmajor[8]; /* 329-336 */ char devminor[8]; /* 337-344 */ char prefix[155]; /* 345-499 */ char padding[12]; /* 500-512 */ } tar; char *cp; int i, sum_u, sum_s, sum; int parse_names; if (sizeof(tar) != 512) BUG_tar_header_size(); #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS again: #endif /* Align header */ data_align(archive_handle, 512); again_after_align: xread(archive_handle->src_fd, &tar, 512); archive_handle->offset += 512; /* If there is no filename its an empty header */ if (tar.name[0] == 0) { if (end) { /* This is the second consecutive empty header! End of archive! * Read until the end to empty the pipe from gz or bz2 */ while (full_read(archive_handle->src_fd, &tar, 512) == 512) /* repeat */; return EXIT_FAILURE; } end = 1; return EXIT_SUCCESS; } end = 0; /* Check header has valid magic, "ustar" is for the proper tar * 0's are for the old tar format */ if (strncmp(tar.magic, "ustar", 5) != 0) { #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"); } /* Do checksum on headers. * POSIX says that checksum is done on unsigned bytes, but * Sun and HP-UX gets it wrong... more details in * GNU tar source. */ sum_s = sum_u = ' ' * sizeof(tar.chksum); for (i = 0; i < 148 ; i++) { sum_u += ((unsigned char*)&tar)[i]; sum_s += ((signed char*)&tar)[i]; } for (i = 156; i < 512 ; i++) { sum_u += ((unsigned char*)&tar)[i]; sum_s += ((signed char*)&tar)[i]; } /* This field does not need special treatment (getOctal) */ sum = xstrtoul(tar.chksum, 8); if (sum_u != sum && sum_s != sum) { bb_error_msg_and_die("invalid tar header checksum"); } /* 0 is reserved for high perf file, treat as normal file */ if (!tar.typeflag) tar.typeflag = '0'; parse_names = (tar.typeflag >= '0' && tar.typeflag <= '7'); /* getOctal trashes subsequent field, therefore we call it * on fields in reverse order */ if (tar.devmajor[0]) { unsigned minor = GET_OCTAL(tar.devminor); 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); /* Set bits 0-11 of the files mode */ file_header->mode = 07777 & GET_OCTAL(tar.mode); file_header->name = NULL; if (!longname && parse_names) { /* we trash mode[0] here, it's ok */ tar.name[sizeof(tar.name)] = '\0'; if (tar.prefix[0]) { /* and padding[0] */ tar.prefix[sizeof(tar.prefix)] = '\0'; file_header->name = concat_path_file(tar.prefix, tar.name); } else file_header->name = xstrdup(tar.name); } /* 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': file_header->mode |= S_IFREG; break; case '7': /* case 0: */ case '0': #if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY if (last_char_is(file_header->name, '/')) { file_header->mode |= S_IFDIR; } else #endif file_header->mode |= S_IFREG; break; case '2': file_header->mode |= S_IFLNK; break; case '3': file_header->mode |= S_IFCHR; break; case '4': file_header->mode |= S_IFBLK; break; case '5': file_header->mode |= S_IFDIR; break; case '6': file_header->mode |= S_IFIFO; break; #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS case 'L': /* free: paranoia: tar with several consecutive longnames */ free(longname); /* For paranoia reasons we allocate extra NUL char */ longname = xzalloc(file_header->size + 1); /* We read ASCIZ string, including NUL */ xread(archive_handle->src_fd, longname, file_header->size); archive_handle->offset += file_header->size; /* return get_header_tar(archive_handle); */ /* gcc 4.1.1 didn't optimize it into jump */ /* so we will do it ourself, this also saves stack */ goto again; 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; /* return get_header_tar(archive_handle); */ goto again; case 'D': /* GNU dump dir */ case 'M': /* Continuation of multi volume archive */ case 'N': /* Old GNU for names > 100 characters */ case 'S': /* Sparse file */ case 'V': /* Volume header */ #endif case 'g': /* pax global header */ case 'x': { /* pax extended header */ off_t sz; bb_error_msg("warning: skipping header '%c'", tar.typeflag); sz = (file_header->size + 511) & ~(off_t)511; archive_handle->offset += sz; sz >>= 9; /* sz /= 512 but w/o contortions for signed div */ while (sz--) xread(archive_handle->src_fd, &tar, 512); /* return get_header_tar(archive_handle); */ goto again_after_align; } default: bb_error_msg_and_die("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 if (!strncmp(file_header->name, "/../"+1, 3) || strstr(file_header->name, "/../") ) { bb_error_msg_and_die("name with '..' encountered: '%s'", file_header->name); } /* Strip trailing '/' in directories */ /* Must be done after mode is set as '/' is used to check if it's a directory */ cp = last_char_is(file_header->name, '/'); if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { archive_handle->action_header(archive_handle->file_header); /* Note that we kill the '/' only after action_header() */ /* (like GNU tar 1.15.1: verbose mode outputs "dir/dir/") */ if (cp) *cp = '\0'; archive_handle->flags |= ARCHIVE_EXTRACT_QUIET; archive_handle->action_data(archive_handle); llist_add_to(&(archive_handle->passed), file_header->name); } else { data_skip(archive_handle); free(file_header->name); } archive_handle->offset += file_header->size; free(file_header->link_name); /* Do not free(file_header->name)! */ return EXIT_SUCCESS; }
extern char get_header_tar(archive_handle_t *archive_handle) { file_header_t *file_header = archive_handle->file_header; union { /* ustar header, Posix 1003.1 */ unsigned char raw[512]; struct { char name[100]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ char linkname[100]; /* 157-256 */ char magic[6]; /* 257-262 */ char version[2]; /* 263-264 */ char uname[32]; /* 265-296 */ char gname[32]; /* 297-328 */ char devmajor[8]; /* 329-336 */ char devminor[8]; /* 337-344 */ char prefix[155]; /* 345-499 */ char padding[12]; /* 500-512 */ } formated; } tar; long sum = 0; long i; /* Align header */ data_align(archive_handle, 512); if (bb_full_read(archive_handle->src_fd, tar.raw, 512) != 512) { /* Assume end of file */ return(EXIT_FAILURE); } archive_handle->offset += 512; /* If there is no filename its an empty header */ if (tar.formated.name[0] == 0) { return(EXIT_SUCCESS); } /* Check header has valid magic, "ustar" is for the proper tar * 0's are for the old tar format */ if (strncmp(tar.formated.magic, "ustar", 5) != 0) { #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0) #endif bb_error_msg_and_die("Invalid tar magic"); } /* Do checksum on headers */ for (i = 0; i < 148 ; i++) { sum += tar.raw[i]; } sum += ' ' * 8; for (i = 156; i < 512 ; i++) { sum += tar.raw[i]; } if (sum != strtol(tar.formated.chksum, NULL, 8)) { bb_error_msg("Invalid tar header checksum"); return(EXIT_FAILURE); } #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 if (tar.formated.prefix[0] == 0) { file_header->name = strdup(tar.formated.name); } else { file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name); } file_header->uid = strtol(tar.formated.uid, NULL, 8); file_header->gid = strtol(tar.formated.gid, NULL, 8); file_header->size = strtol(tar.formated.size, NULL, 8); file_header->mtime = strtol(tar.formated.mtime, NULL, 8); file_header->link_name = (tar.formated.linkname[0] != '\0') ? bb_xstrdup(tar.formated.linkname) : NULL; file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) + strtol(tar.formated.devminor, NULL, 8)); /* Set bits 0-11 of the files mode */ file_header->mode = 07777 & strtol(tar.formated.mode, NULL, 8); /* Set bits 12-15 of the files mode */ switch (tar.formated.typeflag) { /* busybox identifies hard links as being regular files with 0 size and a link name */ case '1': file_header->mode |= S_IFREG; break; case 'x': case 'g': bb_error_msg_and_die("pax is not tar"); break; case '7': /* Reserved for high performance files, treat as normal file */ case 0: case '0': #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY if (last_char_is(file_header->name, '/')) { file_header->mode |= S_IFDIR; } else #endif file_header->mode |= S_IFREG; break; case '2': file_header->mode |= S_IFLNK; break; case '3': file_header->mode |= S_IFCHR; break; case '4': file_header->mode |= S_IFBLK; break; case '5': file_header->mode |= S_IFDIR; break; case '6': file_header->mode |= S_IFIFO; break; #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS case 'L': { longname = xmalloc(file_header->size + 1); archive_xread_all(archive_handle, longname, file_header->size); longname[file_header->size] = '\0'; archive_handle->offset += file_header->size; return(get_header_tar(archive_handle)); } case 'K': { linkname = xmalloc(file_header->size + 1); archive_xread_all(archive_handle, linkname, file_header->size); linkname[file_header->size] = '\0'; 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*/ case 'N': /* Old GNU for names > 100 characters */ case 'S': /* Sparse file */ case 'V': /* Volume header */ bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag); #endif default: bb_error_msg("Unknown typeflag: 0x%x", tar.formated.typeflag); } { /* Strip trailing '/' in directories */ /* Must be done after mode is set as '/' is used to check if its a directory */ char *tmp = last_char_is(file_header->name, '/'); if (tmp) { *tmp = '\0'; } } if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { archive_handle->action_header(archive_handle->file_header); archive_handle->flags |= ARCHIVE_EXTRACT_QUIET; archive_handle->action_data(archive_handle); archive_handle->passed = llist_add_to(archive_handle->passed, file_header->name); } else { data_skip(archive_handle); } archive_handle->offset += file_header->size; free(file_header->link_name); return(EXIT_SUCCESS); }
char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) { file_header_t *file_header = archive_handle->file_header; struct { /* ustar header, Posix 1003.1 */ char name[100]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ char linkname[100]; /* 157-256 */ /* POSIX: "ustar" NUL "00" */ /* GNU tar: "ustar " NUL */ /* Normally it's defined as magic[6] followed by * version[2], but we put them together to simplify code */ char magic[8]; /* 257-264 */ char uname[32]; /* 265-296 */ char gname[32]; /* 297-328 */ char devmajor[8]; /* 329-336 */ char devminor[8]; /* 337-344 */ char prefix[155]; /* 345-499 */ char padding[12]; /* 500-512 */ } tar; char *cp; int i, sum_u, sum; #if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY int sum_s; #endif int parse_names; /* Our "private data" */ #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS # define p_longname (archive_handle->tar__longname) # define p_linkname (archive_handle->tar__linkname) #else # define p_longname 0 # define p_linkname 0 #endif if (sizeof(tar) != 512) BUG_tar_header_size(); #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS again: #endif /* Align header */ data_align(archive_handle, 512); again_after_align: #if ENABLE_DESKTOP || ENABLE_FEATURE_TAR_AUTODETECT /* to prevent misdetection of bz2 sig */ *(uint32_t*)(&tar) = 0; i = full_read(archive_handle->src_fd, &tar, 512); /* If GNU tar sees EOF in above read, it says: * "tar: A lone zero block at N", where N = kilobyte * where EOF was met (not EOF block, actual EOF!), * and exits with EXIT_SUCCESS. * We will mimic exit(EXIT_SUCCESS), although we will not mimic * the message and we don't check whether we indeed * saw zero block directly before this. */ if (i == 0) { xfunc_error_retval = 0; short_read: bb_error_msg_and_die("short read"); } if (i != 512) { IF_FEATURE_TAR_AUTODETECT(goto autodetect;) goto short_read;