goto cleanup;
}
}
+ if (req->request_id) {
+ if (NULL == (resp->request_id = tr_dup_name(req->request_id))) {
+ tr_crit("tids_create_response: Error allocating fields in response.");
+ goto cleanup;
+ }
+ }
success=1;
* @param data pointer to a TIDS_INSTANCE
* @return pointer to the response string or null to send no response
*/
-static char *tids_req_cb(TALLOC_CTX *mem_ctx, const char *req_str, void *data)
+static TR_MSG *tids_req_cb(TALLOC_CTX *mem_ctx, TR_MSG *mreq, void *data)
{
+ TALLOC_CTX *tmp_ctx = talloc_new(NULL);
TIDS_INSTANCE *tids = talloc_get_type_abort(data, TIDS_INSTANCE);
- TR_MSG *mreq = NULL;
TID_REQ *req = NULL;
TID_RESP *resp = NULL;
- char *resp_str = NULL;
+ TR_MSG *resp_msg = NULL; /* this is the return value */
int rc = 0;
- mreq = tr_msg_decode(NULL, req_str, strlen(req_str)); // allocates memory on success!
- if (mreq == NULL) {
- tr_debug("tids_req_cb: Error decoding request.");
- return NULL;
- }
-
/* If this isn't a TID Request, just drop it. */
if (mreq->msg_type != TID_REQUEST) {
- tr_msg_free_decoded(mreq);
tr_debug("tids_req_cb: Not a TID request, dropped.");
- return NULL;
+ goto cleanup;
}
/* Get a handle on the request itself. Don't free req - it belongs to mreq */
req = tr_msg_get_req(mreq);
- /* Allocate a response structure and populate common fields. The resp is in req's talloc context,
- * which will be cleaned up when mreq is freed. */
- resp = tids_create_response(req, req);
+ /* Allocate a response message */
+ resp_msg = talloc(tmp_ctx, TR_MSG);
+ if (resp_msg == NULL) {
+ /* We cannot create a response message, so all we can really do is emit
+ * an error message and return. */
+ tr_crit("tids_req_cb: Error allocating response message.");
+ goto cleanup;
+ }
+
+ /* Allocate a response structure and populate common fields. Put it in the
+ * response message's talloc context. */
+ resp = tids_create_response(resp_msg, req);
if (resp == NULL) {
/* If we were unable to create a response, we cannot reply. Log an
* error if we can, then drop the request. */
- tr_msg_free_decoded(mreq);
tr_crit("tids_req_cb: Error creating response structure.");
- return NULL;
+ resp_msg = NULL; /* the contents are in tmp_ctx, so they will still be cleaned up */
+ goto cleanup;
}
+ /* Now officially assign the response to the message. */
+ tr_msg_set_resp(resp_msg, resp);
/* Handle the request and fill in resp */
rc = tids_handle_request(tids, req, resp);
/* Fall through, to send the response, either way */
}
- /* Convert the completed response into an encoded response */
- resp_str = tids_encode_response(mem_ctx, resp);
+ /* put the response message in the caller's context */
+ talloc_steal(mem_ctx, resp_msg);
+
+cleanup:
+ talloc_free(tmp_ctx);
+ return resp_msg;
+}
- /* Finished; free the request and return */
- tr_msg_free_decoded(mreq); // this frees req and resp, too
- return resp_str;
+static int tids_destructor(void *object)
+{
+ TIDS_INSTANCE *tids = talloc_get_type_abort(object, TIDS_INSTANCE);
+ if (tids->pids)
+ g_array_unref(tids->pids);
+ return 0;
}
TIDS_INSTANCE *tids_new(TALLOC_CTX *mem_ctx)
{
- return talloc_zero(mem_ctx, TIDS_INSTANCE);
+ TIDS_INSTANCE *tids = talloc_zero(mem_ctx, TIDS_INSTANCE);
+ if (tids) {
+ tids->pids = g_array_new(FALSE, FALSE, sizeof(struct tid_process));
+ if (tids->pids == NULL) {
+ talloc_free(tids);
+ return NULL;
+ }
+ talloc_set_destructor((void *)tids, tids_destructor);
+ }
+ return tids;
}
/**
*/
TIDS_INSTANCE *tids_create(void)
{
- return talloc_zero(NULL, TIDS_INSTANCE);
+ return tids_new(NULL);
}
+
/* Get a listener for tids requests, returns its socket fd. Accept
* connections with tids_accept() */
nfds_t tids_get_listener(TIDS_INSTANCE *tids,
return (int)n_fd;
}
+/* Strings used to report results from the handler process. The
+ * TIDS_MAX_MESSAGE_LEN must be longer than the longest message, including
+ * null termination (i.e., strlen() + 1) */
+#define TIDS_MAX_MESSAGE_LEN (10)
+#define TIDS_SUCCESS_MESSAGE "OK"
+#define TIDS_ERROR_MESSAGE "ERR"
+
+/**
+ * Process to handle an incoming TIDS request
+ *
+ * This should be run in the child process after a fork(). Handles
+ * the request, writes the result to result_fd, and terminates via exit().
+ * Never returns to the caller.
+ *
+ * @param tids TID server instance
+ * @param conn_fd file descriptor for the incoming connection
+ * @param result_fd writable file descriptor for the result, or 0 to disable reporting
+ */
+static void tids_handle_proc(TIDS_INSTANCE *tids, int conn_fd, int result_fd)
+{
+ const char *response_message = NULL;
+
+ switch(tr_gss_handle_connection(conn_fd,
+ "trustidentity", tids->hostname, /* acceptor name */
+ tids->auth_handler, tids->cookie, /* auth callback and cookie */
+ tids_req_cb, tids /* req callback and cookie */
+ )) {
+ case TR_GSS_SUCCESS:
+ response_message = TIDS_SUCCESS_MESSAGE;
+ break;
+
+ case TR_GSS_ERROR:
+ default:
+ response_message = TIDS_ERROR_MESSAGE;
+ break;
+ }
+
+ if (0 != result_fd) {
+ /* write strlen + 1 to include the null termination */
+ if (write(result_fd, response_message, strlen(response_message) + 1) < 0)
+ tr_err("tids_accept: child process unable to write to pipe");
+ }
+
+ close(result_fd);
+ close(conn_fd);
+ exit(0); /* exit to kill forked child process */
+}
+
/* Accept and process a connection on a port opened with tids_get_listener() */
int tids_accept(TIDS_INSTANCE *tids, int listen)
{
int conn=-1;
int pid=-1;
+ int pipe_fd[2];
+ struct tid_process tp = {0};
- if (0 > (conn = accept(listen, NULL, NULL))) {
- perror("Error from TIDS Server accept()");
+ if (0 > (conn = tr_sock_accept(listen))) {
+ tr_err("tids_accept: Error accepting connection");
return 1;
}
+ if (0 > pipe(pipe_fd)) {
+ perror("Error on pipe()");
+ return 1;
+ }
+ /* pipe_fd[0] is for reading, pipe_fd[1] is for writing */
+
if (0 > (pid = fork())) {
perror("Error on fork()");
return 1;
}
if (pid == 0) {
- close(listen);
- tr_gss_handle_connection(conn,
- "trustidentity", tids->hostname, /* acceptor name */
- tids->auth_handler, tids->cookie, /* auth callback and cookie */
- tids_req_cb, tids /* req callback and cookie */
- );
- close(conn);
- exit(0); /* exit to kill forked child process */
- } else {
- close(conn);
+ /* Only the child process gets here */
+ close(pipe_fd[0]); /* close the read end of the pipe, the child only writes */
+ close(listen); /* close the child process's handle on the listen port */
+
+ tids_handle_proc(tids, conn, pipe_fd[1]); /* never returns */
}
- /* clean up any processes that have completed (TBD: move to main loop?) */
- while (waitpid(-1, 0, WNOHANG) > 0);
+ /* Only the parent process gets here */
+ close(pipe_fd[1]); /* close the write end of the pipe, the parent only listens */
+ close(conn); /* connection belongs to the child, so close parent's handle */
+
+ /* remember the PID of our child process */
+ tr_info("tids_accept: Spawned TID process %d to handle incoming connection.", pid);
+ tp.pid = pid;
+ tp.read_fd = pipe_fd[0];
+ g_array_append_val(tids->pids, tp);
+ /* clean up any processes that have completed */
+ tids_sweep_procs(tids);
return 0;
}
+/**
+ * Clean up any finished TID request processes
+ *
+ * This is called by the main process after forking each TID request. If you want to be
+ * sure finished processes are cleaned up promptly even during a lull in TID requests,
+ * this can be called from the main thread of the main process. It is not thread-safe,
+ * so should not be used from sub-threads. It should not be called by child processes -
+ * this would probably be harmless but ineffective.
+ *
+ * @param tids
+ */
+void tids_sweep_procs(TIDS_INSTANCE *tids)
+{
+ guint ii;
+ struct tid_process tp = {0};
+ char result[TIDS_MAX_MESSAGE_LEN] = {0};
+ ssize_t result_len;
+ int status;
+ int wait_rc;
+
+ /* loop backwards over the array so we can remove elements as we go */
+ for (ii=tids->pids->len; ii > 0; ii--) {
+ /* ii-1 is the current index - get our own copy, we may destroy the list's copy */
+ tp = g_array_index(tids->pids, struct tid_process, ii-1);
+
+ wait_rc = waitpid(tp.pid, &status, WNOHANG);
+ if (wait_rc == 0)
+ continue; /* process still running */
+
+ if (wait_rc < 0) {
+ /* invalid options will probably keep being invalid, report that condition */
+ if(errno == EINVAL)
+ tr_crit("tids_sweep_procs: waitpid called with invalid options");
+
+ /* If we got ECHILD, that means the PID was invalid; we'll assume the process was
+ * terminated and we missed it. For all other errors, move on
+ * to the next PID to check. */
+ if (errno != ECHILD)
+ continue;
+
+ tr_warning("tid_sweep_procs: TID process %d disappeared", tp.pid);
+ }
+
+ /* remove the item (we still have a copy of the data) */
+ g_array_remove_index_fast(tids->pids, ii-1); /* disturbs only indices >= ii-1 which we've already handled */
+
+ /* Report exit status unless we got ECHILD above or somehow waitpid returned the wrong pid */
+ if (wait_rc == tp.pid) {
+ if (WIFEXITED(status)) {
+ tr_debug("tids_sweep_procs: TID process %d exited with status %d.", tp.pid, WTERMSIG(status));
+ } else if (WIFSIGNALED(status)) {
+ tr_debug("tids_sweep_procs: TID process %d terminated by signal %d.", tp.pid, WTERMSIG(status));
+ }
+ } else if (wait_rc > 0) {
+ tr_err("tids_sweep_procs: waitpid returned pid %d, expected %d", wait_rc, tp.pid);
+ }
+
+ /* read the pipe - if the TID request worked, it will have written status before terminating */
+ result_len = read(tp.read_fd, result, TIDS_MAX_MESSAGE_LEN);
+ close(tp.read_fd);
+
+ if ((result_len > 0) && (strcmp(result, TIDS_SUCCESS_MESSAGE) == 0)) {
+ tids->req_count++;
+ tr_info("tids_sweep_procs: TID process %d exited successfully.", tp.pid);
+ } else {
+ tids->error_count++;
+ tr_info("tids_sweep_procs: TID process %d exited with an error.", tp.pid);
+ }
+ }
+}
+
/* Process tids requests forever. Should not return except on error. */
int tids_start (TIDS_INSTANCE *tids,
TIDS_REQ_FUNC *req_handler,
projects / trust_router.git / blobdiff