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-rw-r--r--archival/libunarchive/Kbuild.src1
-rw-r--r--archival/libunarchive/data_extract_to_command.c137
2 files changed, 138 insertions, 0 deletions
diff --git a/archival/libunarchive/Kbuild.src b/archival/libunarchive/Kbuild.src
index 81854558b..6ad1d7a65 100644
--- a/archival/libunarchive/Kbuild.src
+++ b/archival/libunarchive/Kbuild.src
@@ -53,6 +53,7 @@ lib-$(CONFIG_FEATURE_SEAMLESS_BZ2) += open_transformer.o decompress_bunzip2
lib-$(CONFIG_FEATURE_SEAMLESS_LZMA) += open_transformer.o decompress_unlzma.o get_header_tar_lzma.o
lib-$(CONFIG_FEATURE_SEAMLESS_XZ) += open_transformer.o decompress_unxz.o
lib-$(CONFIG_FEATURE_COMPRESS_USAGE) += decompress_bunzip2.o
+lib-$(CONFIG_FEATURE_TAR_TO_COMMAND) += data_extract_to_command.o
ifneq ($(lib-y),)
lib-y += $(COMMON_FILES)
diff --git a/archival/libunarchive/data_extract_to_command.c b/archival/libunarchive/data_extract_to_command.c
new file mode 100644
index 000000000..983c5301d
--- /dev/null
+++ b/archival/libunarchive/data_extract_to_command.c
@@ -0,0 +1,137 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include "unarchive.h"
+
+enum {
+ //TAR_FILETYPE,
+ TAR_MODE,
+ TAR_FILENAME,
+ TAR_REALNAME,
+#if ENABLE_FEATURE_TAR_UNAME_GNAME
+ TAR_UNAME,
+ TAR_GNAME,
+#endif
+ TAR_SIZE,
+ TAR_UID,
+ TAR_GID,
+ TAR_MAX,
+};
+
+static const char *const tar_var[] = {
+ // "FILETYPE",
+ "MODE",
+ "FILENAME",
+ "REALNAME",
+#if ENABLE_FEATURE_TAR_UNAME_GNAME
+ "UNAME",
+ "GNAME",
+#endif
+ "SIZE",
+ "UID",
+ "GID",
+};
+
+static void xputenv(char *str)
+{
+ if (putenv(str))
+ bb_error_msg_and_die(bb_msg_memory_exhausted);
+}
+
+static void str2env(char *env[], int idx, const char *str)
+{
+ env[idx] = xasprintf("TAR_%s=%s", tar_var[idx], str);
+ xputenv(env[idx]);
+}
+
+static void dec2env(char *env[], int idx, unsigned long long val)
+{
+ env[idx] = xasprintf("TAR_%s=%llu", tar_var[idx], val);
+ xputenv(env[idx]);
+}
+
+static void oct2env(char *env[], int idx, unsigned long val)
+{
+ env[idx] = xasprintf("TAR_%s=%lo", tar_var[idx], val);
+ xputenv(env[idx]);
+}
+
+void FAST_FUNC data_extract_to_command(archive_handle_t *archive_handle)
+{
+ file_header_t *file_header = archive_handle->file_header;
+
+#if 0 /* do we need this? ENABLE_FEATURE_TAR_SELINUX */
+ char *sctx = archive_handle->tar__next_file_sctx;
+ if (!sctx)
+ sctx = archive_handle->tar__global_sctx;
+ if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */
+ setfscreatecon(sctx);
+ free(archive_handle->tar__next_file_sctx);
+ archive_handle->tar__next_file_sctx = NULL;
+ }
+#endif
+
+ if ((file_header->mode & S_IFMT) == S_IFREG) {
+ pid_t pid;
+ int p[2], status;
+ char *tar_env[TAR_MAX];
+
+ memset(tar_env, 0, sizeof(tar_env));
+
+ xpipe(p);
+ pid = BB_MMU ? fork() : vfork();
+ switch (pid) {
+ case -1:
+ bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
+ case 0:
+ /* Child */
+ /* str2env(tar_env, TAR_FILETYPE, "f"); - parent should do it once */
+ oct2env(tar_env, TAR_MODE, file_header->mode);
+ str2env(tar_env, TAR_FILENAME, file_header->name);
+ str2env(tar_env, TAR_REALNAME, file_header->name);
+#if ENABLE_FEATURE_TAR_UNAME_GNAME
+ str2env(tar_env, TAR_UNAME, file_header->tar__uname);
+ str2env(tar_env, TAR_GNAME, file_header->tar__gname);
+#endif
+ dec2env(tar_env, TAR_SIZE, file_header->size);
+ dec2env(tar_env, TAR_UID, file_header->uid);
+ dec2env(tar_env, TAR_GID, file_header->gid);
+ close(p[1]);
+ xdup2(p[0], STDIN_FILENO);
+ signal(SIGPIPE, SIG_DFL);
+ execl("/bin/sh", "/bin/sh" + 5, "-c", archive_handle->tar__to_command, NULL);
+ bb_perror_msg_and_die("can't execute '%s'", "/bin/sh");
+ }
+ close(p[0]);
+ /* Our caller is expected to do signal(SIGPIPE, SIG_IGN)
+ * so that we don't die if child don't read all the input: */
+ bb_copyfd_exact_size(archive_handle->src_fd, p[1], file_header->size);
+ close(p[1]);
+
+ if (safe_waitpid(pid, &status, 0) == -1)
+ bb_perror_msg_and_die("waitpid");
+ if (WIFEXITED(status) && WEXITSTATUS(status))
+ bb_error_msg_and_die("'%s' returned status %d",
+ archive_handle->tar__to_command, WEXITSTATUS(status));
+ if (WIFSIGNALED(status))
+ bb_error_msg_and_die("'%s' terminated on signal %d",
+ archive_handle->tar__to_command, WTERMSIG(status));
+
+ if (!BB_MMU) {
+ int i;
+ for (i = 0; i < TAR_MAX; i++) {
+ if (tar_env[i])
+ bb_unsetenv_and_free(tar_env[i]);
+ }
+ }
+ }
+
+#if 0 /* ENABLE_FEATURE_TAR_SELINUX */
+ if (sctx)
+ /* reset the context after creating an entry */
+ setfscreatecon(NULL);
+#endif
+}