diff options
Diffstat (limited to 'archival/libarchive/open_transformer.c')
| -rw-r--r-- | archival/libarchive/open_transformer.c | 113 |
1 files changed, 57 insertions, 56 deletions
diff --git a/archival/libarchive/open_transformer.c b/archival/libarchive/open_transformer.c index 743ffee02..693ae9995 100644 --- a/archival/libarchive/open_transformer.c +++ b/archival/libarchive/open_transformer.c @@ -6,24 +6,36 @@ #include "libbb.h" #include "bb_archive.h" -#define ZIPPED (ENABLE_FEATURE_SEAMLESS_LZMA \ - || ENABLE_FEATURE_SEAMLESS_BZ2 \ - || ENABLE_FEATURE_SEAMLESS_GZ \ - /* || ENABLE_FEATURE_SEAMLESS_Z */ \ -) +void FAST_FUNC init_transformer_aux_data(transformer_aux_data_t *aux) +{ + memset(aux, 0, sizeof(*aux)); +} -#if ZIPPED -# include "bb_archive.h" +int FAST_FUNC check_signature16(transformer_aux_data_t *aux, int src_fd, unsigned magic16) +{ + if (aux && aux->check_signature) { + uint16_t magic2; + if (full_read(src_fd, &magic2, 2) != 2 || magic2 != magic16) { + bb_error_msg("invalid magic"); +#if 0 /* possible future extension */ + if (aux->check_signature > 1) + xfunc_die(); #endif + return -1; + } + } + return 0; +} /* transformer(), more than meets the eye */ -/* - * On MMU machine, the transform_prog is removed by macro magic - * in include/archive.h. On NOMMU, transformer is removed. - */ +#if BB_MMU void FAST_FUNC open_transformer(int fd, - IF_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd), - const char *transform_prog) + int check_signature, + IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd) +) +#else +void FAST_FUNC open_transformer(int fd, const char *transform_prog) +#endif { struct fd_pair fd_pipe; int pid; @@ -35,13 +47,18 @@ void FAST_FUNC open_transformer(int fd, close(fd_pipe.rd); /* we don't want to read from the parent */ // FIXME: error check? #if BB_MMU - transformer(fd, fd_pipe.wr); - if (ENABLE_FEATURE_CLEAN_UP) { - close(fd_pipe.wr); /* send EOF */ - close(fd); + { + transformer_aux_data_t aux; + init_transformer_aux_data(&aux); + aux.check_signature = check_signature; + transformer(&aux, fd, fd_pipe.wr); + if (ENABLE_FEATURE_CLEAN_UP) { + close(fd_pipe.wr); /* send EOF */ + close(fd); + } + /* must be _exit! bug was actually seen here */ + _exit(EXIT_SUCCESS); } - /* must be _exit! bug was actually seen here */ - _exit(EXIT_SUCCESS); #else { char *argv[4]; @@ -64,26 +81,21 @@ void FAST_FUNC open_transformer(int fd, } +#if SEAMLESS_COMPRESSION + /* Used by e.g. rpm which gives us a fd without filename, * thus we can't guess the format from filename's extension. */ -#if ZIPPED -void FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/) +int FAST_FUNC setup_unzip_on_fd(int fd, int fail_if_not_detected) { - const int fail_if_not_detected = 1; union { uint8_t b[4]; uint16_t b16[2]; uint32_t b32[1]; } magic; int offset = -2; -# if BB_MMU - IF_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd); - enum { xformer_prog = 0 }; -# else - enum { xformer = 0 }; - const char *xformer_prog; -# endif + USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd);) + USE_FOR_NOMMU(const char *xformer_prog;) /* .gz and .bz2 both have 2-byte signature, and their * unpack_XXX_stream wants this header skipped. */ @@ -91,21 +103,15 @@ void FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/) if (ENABLE_FEATURE_SEAMLESS_GZ && magic.b16[0] == GZIP_MAGIC ) { -# if BB_MMU - xformer = unpack_gz_stream; -# else - xformer_prog = "gunzip"; -# endif + USE_FOR_MMU(xformer = unpack_gz_stream;) + USE_FOR_NOMMU(xformer_prog = "gunzip";) goto found_magic; } if (ENABLE_FEATURE_SEAMLESS_BZ2 && magic.b16[0] == BZIP2_MAGIC ) { -# if BB_MMU - xformer = unpack_bz2_stream; -# else - xformer_prog = "bunzip2"; -# endif + USE_FOR_MMU(xformer = unpack_bz2_stream;) + USE_FOR_NOMMU(xformer_prog = "bunzip2";) goto found_magic; } if (ENABLE_FEATURE_SEAMLESS_XZ @@ -114,13 +120,8 @@ void FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/) offset = -6; xread(fd, magic.b32, sizeof(magic.b32[0])); if (magic.b32[0] == XZ_MAGIC2) { -# if BB_MMU - xformer = unpack_xz_stream; - /* unpack_xz_stream wants fd at position 6, no need to seek */ - //xlseek(fd, offset, SEEK_CUR); -# else - xformer_prog = "unxz"; -# endif + USE_FOR_MMU(xformer = unpack_xz_stream;) + USE_FOR_NOMMU(xformer_prog = "unxz";) goto found_magic; } } @@ -132,24 +133,23 @@ void FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/) IF_FEATURE_SEAMLESS_XZ("/xz") " magic"); xlseek(fd, offset, SEEK_CUR); - return; + return 1; found_magic: -# if !BB_MMU +# if BB_MMU + open_transformer_with_no_sig(fd, xformer); +# else /* NOMMU version of open_transformer execs * an external unzipper that wants * file position at the start of the file */ xlseek(fd, offset, SEEK_CUR); + open_transformer_with_sig(fd, xformer, xformer_prog); # endif - open_transformer(fd, xformer, xformer_prog); + return 0; } -#endif /* ZIPPED */ int FAST_FUNC open_zipped(const char *fname) { -#if !ZIPPED - return open(fname, O_RDONLY); -#else char *sfx; int fd; @@ -162,20 +162,21 @@ int FAST_FUNC open_zipped(const char *fname) sfx++; if (ENABLE_FEATURE_SEAMLESS_LZMA && strcmp(sfx, "lzma") == 0) /* .lzma has no header/signature, just trust it */ - open_transformer(fd, unpack_lzma_stream, "unlzma"); + open_transformer_with_sig(fd, unpack_lzma_stream, "unlzma"); else if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, "gz") == 0) || (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, "bz2") == 0) || (ENABLE_FEATURE_SEAMLESS_XZ && strcmp(sfx, "xz") == 0) ) { - setup_unzip_on_fd(fd /*, fail_if_not_detected: 1*/); + setup_unzip_on_fd(fd, /*fail_if_not_detected:*/ 1); } } return fd; -#endif } +#endif /* SEAMLESS_COMPRESSION */ + void* FAST_FUNC xmalloc_open_zipped_read_close(const char *fname, size_t *maxsz_p) { int fd; |