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https://git.busybox.net/busybox.git
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137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include "bb_archive.h"
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enum {
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//TAR_FILETYPE,
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TAR_MODE,
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TAR_FILENAME,
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TAR_REALNAME,
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#if ENABLE_FEATURE_TAR_UNAME_GNAME
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TAR_UNAME,
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TAR_GNAME,
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#endif
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TAR_SIZE,
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TAR_UID,
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TAR_GID,
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TAR_MAX,
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};
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static const char *const tar_var[] = {
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// "FILETYPE",
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"MODE",
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"FILENAME",
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"REALNAME",
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#if ENABLE_FEATURE_TAR_UNAME_GNAME
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"UNAME",
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"GNAME",
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#endif
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"SIZE",
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"UID",
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"GID",
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};
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static void xputenv(char *str)
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{
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if (putenv(str))
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bb_error_msg_and_die(bb_msg_memory_exhausted);
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}
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static void str2env(char *env[], int idx, const char *str)
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{
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env[idx] = xasprintf("TAR_%s=%s", tar_var[idx], str);
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xputenv(env[idx]);
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}
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static void dec2env(char *env[], int idx, unsigned long long val)
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{
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env[idx] = xasprintf("TAR_%s=%llu", tar_var[idx], val);
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xputenv(env[idx]);
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}
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static void oct2env(char *env[], int idx, unsigned long val)
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{
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env[idx] = xasprintf("TAR_%s=%lo", tar_var[idx], val);
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xputenv(env[idx]);
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}
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void FAST_FUNC data_extract_to_command(archive_handle_t *archive_handle)
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{
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file_header_t *file_header = archive_handle->file_header;
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#if 0 /* do we need this? ENABLE_FEATURE_TAR_SELINUX */
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char *sctx = archive_handle->tar__sctx[PAX_NEXT_FILE];
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if (!sctx)
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sctx = archive_handle->tar__sctx[PAX_GLOBAL];
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if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */
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setfscreatecon(sctx);
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free(archive_handle->tar__sctx[PAX_NEXT_FILE]);
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archive_handle->tar__sctx[PAX_NEXT_FILE] = NULL;
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}
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#endif
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if ((file_header->mode & S_IFMT) == S_IFREG) {
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pid_t pid;
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int p[2], status;
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char *tar_env[TAR_MAX];
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memset(tar_env, 0, sizeof(tar_env));
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xpipe(p);
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pid = BB_MMU ? xfork() : xvfork();
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if (pid == 0) {
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/* Child */
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/* str2env(tar_env, TAR_FILETYPE, "f"); - parent should do it once */
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oct2env(tar_env, TAR_MODE, file_header->mode);
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str2env(tar_env, TAR_FILENAME, file_header->name);
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str2env(tar_env, TAR_REALNAME, file_header->name);
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#if ENABLE_FEATURE_TAR_UNAME_GNAME
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str2env(tar_env, TAR_UNAME, file_header->tar__uname);
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str2env(tar_env, TAR_GNAME, file_header->tar__gname);
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#endif
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dec2env(tar_env, TAR_SIZE, file_header->size);
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dec2env(tar_env, TAR_UID, file_header->uid);
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dec2env(tar_env, TAR_GID, file_header->gid);
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close(p[1]);
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xdup2(p[0], STDIN_FILENO);
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signal(SIGPIPE, SIG_DFL);
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execl(archive_handle->tar__to_command_shell,
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archive_handle->tar__to_command_shell,
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"-c",
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archive_handle->tar__to_command,
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(char *)0);
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bb_perror_msg_and_die("can't execute '%s'", archive_handle->tar__to_command_shell);
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}
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close(p[0]);
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/* Our caller is expected to do signal(SIGPIPE, SIG_IGN)
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* so that we don't die if child don't read all the input: */
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bb_copyfd_exact_size(archive_handle->src_fd, p[1], -file_header->size);
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close(p[1]);
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status = wait_for_exitstatus(pid);
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if (WIFEXITED(status) && WEXITSTATUS(status))
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bb_error_msg_and_die("'%s' returned status %d",
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archive_handle->tar__to_command, WEXITSTATUS(status));
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if (WIFSIGNALED(status))
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bb_error_msg_and_die("'%s' terminated by signal %d",
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archive_handle->tar__to_command, WTERMSIG(status));
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if (!BB_MMU) {
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int i;
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for (i = 0; i < TAR_MAX; i++) {
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if (tar_env[i])
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bb_unsetenv_and_free(tar_env[i]);
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}
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}
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}
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#if 0 /* ENABLE_FEATURE_TAR_SELINUX */
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if (sctx)
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/* reset the context after creating an entry */
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setfscreatecon(NULL);
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#endif
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}
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