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-rw-r--r--server/providers/child_common.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/server/providers/child_common.c b/server/providers/child_common.c
index 9ec09f297..15e0eefe7 100644
--- a/server/providers/child_common.c
+++ b/server/providers/child_common.c
@@ -26,6 +26,7 @@
#include <fcntl.h>
#include <tevent.h>
#include <sys/wait.h>
+#include <errno.h>
#include "util/util.h"
#include "util/find_uid.h"
@@ -193,3 +194,134 @@ void child_sig_handler(struct tevent_context *ev,
return;
}
+static errno_t prepare_child_argv(TALLOC_CTX *mem_ctx,
+ int child_debug_fd,
+ const char *binary,
+ char ***_argv)
+{
+ uint_t argc = 3; /* program name, debug_level and NULL */
+ char ** argv;
+ errno_t ret = EINVAL;
+
+ /* Save the current state in case an interrupt changes it */
+ bool child_debug_to_file = debug_to_file;
+ bool child_debug_timestamps = debug_timestamps;
+
+ if (child_debug_to_file) argc++;
+ if (child_debug_timestamps) argc++;
+
+ /* program name, debug_level,
+ * debug_to_file, debug_timestamps
+ * and NULL */
+ argv = talloc_array(mem_ctx, char *, argc);
+ if (argv == NULL) {
+ DEBUG(1, ("talloc_array failed.\n"));
+ return ENOMEM;
+ }
+
+ argv[--argc] = NULL;
+
+ argv[--argc] = talloc_asprintf(argv, "--debug-level=%d",
+ debug_level);
+ if (argv[argc] == NULL) {
+ ret = ENOMEM;
+ goto fail;
+ }
+
+ if (child_debug_to_file) {
+ argv[--argc] = talloc_asprintf(argv, "--debug-fd=%d",
+ child_debug_fd);
+ if (argv[argc] == NULL) {
+ ret = ENOMEM;
+ goto fail;
+ }
+ }
+
+ if (child_debug_timestamps) {
+ argv[--argc] = talloc_strdup(argv, "--debug-timestamps");
+ if (argv[argc] == NULL) {
+ ret = ENOMEM;
+ goto fail;
+ }
+ }
+
+ argv[--argc] = talloc_strdup(argv, binary);
+ if (argv[argc] == NULL) {
+ ret = ENOMEM;
+ goto fail;
+ }
+
+ if (argc != 0) {
+ ret = EINVAL;
+ goto fail;
+ }
+
+ *_argv = argv;
+
+ return EOK;
+
+fail:
+ talloc_free(argv);
+ return ret;
+}
+
+errno_t exec_child(TALLOC_CTX *mem_ctx,
+ int *pipefd_to_child, int *pipefd_from_child,
+ const char *binary, int debug_fd)
+{
+ int ret;
+ errno_t err;
+ char **argv;
+
+ close(pipefd_to_child[1]);
+ ret = dup2(pipefd_to_child[0], STDIN_FILENO);
+ if (ret == -1) {
+ err = errno;
+ DEBUG(1, ("dup2 failed [%d][%s].\n", err, strerror(err)));
+ return err;
+ }
+
+ close(pipefd_from_child[0]);
+ ret = dup2(pipefd_from_child[1], STDOUT_FILENO);
+ if (ret == -1) {
+ err = errno;
+ DEBUG(1, ("dup2 failed [%d][%s].\n", err, strerror(err)));
+ return err;
+ }
+
+ ret = prepare_child_argv(mem_ctx, debug_fd,
+ binary, &argv);
+ if (ret != EOK) {
+ DEBUG(1, ("prepare_child_argv.\n"));
+ return ret;
+ }
+
+ ret = execv(binary, argv);
+ if (ret == -1) {
+ err = errno;
+ DEBUG(1, ("execv failed [%d][%s].\n", err, strerror(err)));
+ return err;
+ }
+
+ return EOK;
+}
+
+void child_cleanup(int readfd, int writefd)
+{
+ int ret;
+
+ if (readfd != -1) {
+ ret = close(readfd);
+ if (ret != EOK) {
+ ret = errno;
+ DEBUG(1, ("close failed [%d][%s].\n", errno, strerror(errno)));
+ }
+ }
+ if (writefd != -1) {
+ ret = close(writefd);
+ if (ret != EOK) {
+ ret = errno;
+ DEBUG(1, ("close failed [%d][%s].\n", errno, strerror(errno)));
+ }
+ }
+}