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41 #include <sys/socket.h>
47 #include <tid_internal.h>
51 #include <tr_socket.h>
55 static TID_RESP *tids_create_response(TALLOC_CTX *mem_ctx, TIDS_INSTANCE *tids, TID_REQ *req)
60 if (NULL == (resp = tid_resp_new(mem_ctx))) {
61 tr_crit("tids_create_response: Error allocating response structure.");
65 resp->result = TID_SUCCESS; /* presume success */
66 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
67 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
68 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
69 tr_crit("tids_create_response: Error allocating fields in response.");
73 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
74 tr_crit("tids_create_response: Error allocating fields in response.");
82 if ((!success) && (resp!=NULL)) {
89 static int tids_handle_request(TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
93 /* Check that this is a valid TID Request. If not, send an error return. */
98 tr_notice("tids_handle_request(): Not a valid TID Request.");
99 resp->result = TID_ERROR;
100 resp->err_msg = tr_new_name("Bad request format");
104 tr_debug("tids_handle_request: adding self to req path.");
105 tid_req_add_path(req, tids->hostname, tids->tids_port);
107 /* Call the caller's request handler */
108 /* TBD -- Handle different error returns/msgs */
109 if (0 > (rc = (*tids->req_handler)(tids, req, resp, tids->cookie))) {
110 /* set-up an error response */
111 tr_debug("tids_handle_request: req_handler returned error.");
112 resp->result = TID_ERROR;
113 if (!resp->err_msg) /* Use msg set by handler, if any */
114 resp->err_msg = tr_new_name("Internal processing error");
117 /* set-up a success response */
118 tr_debug("tids_handle_request: req_handler returned success.");
119 resp->result = TID_SUCCESS;
120 resp->err_msg = NULL; /* No error msg on successful return */
127 * Produces a JSON-encoded msg containing the TID response
129 * @param mem_ctx talloc context for the return value
130 * @param tids TIDS_INSTANCE handling the request
131 * @param req incoming request
132 * @param resp outgoing response
133 * @return JSON-encoded message containing the TID response
135 static char *tids_encode_response(TALLOC_CTX *mem_ctx, TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
138 char *resp_buf = NULL;
140 /* Construct the response message */
141 mresp.msg_type = TID_RESPONSE;
142 tr_msg_set_resp(&mresp, resp);
144 /* Encode the message to JSON */
145 resp_buf = tr_msg_encode(mem_ctx, &mresp);
146 if (resp_buf == NULL) {
147 tr_err("tids_encode_response: Error encoding json response.");
150 tr_debug("tids_encode_response: Encoded response: %s", resp_buf);
157 * Encode/send an error response
159 * Part of the public interface
166 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
167 TID_RESP *resp = NULL;
170 if ((!tids) || (!req) || (!err_msg)) {
171 tr_debug("tids_send_err_response: Invalid parameters.");
175 /* If we already sent a response, don't send another no matter what. */
179 if (NULL == (resp = tids_create_response(req, tids, req))) {
180 tr_crit("tids_send_err_response: Can't create response.");
184 /* mark this as an error response, and include the error message */
185 resp->result = TID_ERROR;
186 resp->err_msg = tr_new_name((char *)err_msg);
187 resp->error_path = req->path;
189 rc = tids_send_response(tids, req, resp);
196 * Encode/send a response
198 * Part of the public interface
205 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
210 if ((!tids) || (!req) || (!resp)) {
211 tr_debug("tids_send_response: Invalid parameters.");
215 /* Never send a second response if we already sent one. */
219 resp_buf = tids_encode_response(NULL, tids, req, resp);
220 if (resp_buf == NULL) {
221 tr_err("tids_send_response: Error encoding json response.");
226 tr_debug("tids_send_response: Encoded response: %s", resp_buf);
228 /* If external logging is enabled, fire off a message */
229 /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
232 /* Send the response over the connection */
233 err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
234 strlen(resp_buf) + 1);
236 tr_notice("tids_send_response: Error sending response over connection.");
241 /* indicate that a response has been sent for this request */
250 * Callback to process a request and produce a response
252 * @param req_str JSON-encoded request
253 * @param data pointer to a TIDS_INSTANCE
254 * @return pointer to the response string or null to send no response
256 static char *tids_req_cb(TALLOC_CTX *mem_ctx, const char *req_str, void *data)
258 TIDS_INSTANCE *tids = talloc_get_type_abort(data, TIDS_INSTANCE);
261 TID_RESP *resp = NULL;
262 char *resp_str = NULL;
265 mreq = tr_msg_decode(req_str, strlen(req_str)); // allocates memory on success!
267 tr_debug("tids_req_cb: Error decoding request.");
271 /* If this isn't a TID Request, just drop it. */
272 if (mreq->msg_type != TID_REQUEST) {
273 tr_msg_free_decoded(mreq);
274 tr_debug("tids_req_cb: Not a TID request, dropped.");
278 /* Get a handle on the request itself. Don't free req - it belongs to mreq */
279 req = tr_msg_get_req(mreq);
281 /* Allocate a response structure and populate common fields. The resp is in req's talloc context,
282 * which will be cleaned up when mreq is freed. */
283 resp = tids_create_response(req, tids, req);
285 /* If we were unable to create a response, we cannot reply. Log an
286 * error if we can, then drop the request. */
287 tr_msg_free_decoded(mreq);
288 tr_crit("tids_req_cb: Error creating response structure.");
292 /* Handle the request and fill in resp */
293 rc = tids_handle_request(tids, req, resp);
295 tr_debug("tids_req_cb: Error from tids_handle_request(), rc = %d.", rc);
296 /* Fall through, to send the response, either way */
299 /* Convert the completed response into an encoded response */
300 resp_str = tids_encode_response(mem_ctx, tids, req, resp);
302 /* Finished; free the request and return */
303 tr_msg_free_decoded(mreq); // this frees req and resp, too
307 TIDS_INSTANCE *tids_new(TALLOC_CTX *mem_ctx)
309 return talloc_zero(mem_ctx, TIDS_INSTANCE);
313 * Create a new TIDS instance
315 * Deprecated: exists for ABI compatibility, but tids_new() should be used instead
318 TIDS_INSTANCE *tids_create(void)
320 return talloc_zero(NULL, TIDS_INSTANCE);
322 /* Get a listener for tids requests, returns its socket fd. Accept
323 * connections with tids_accept() */
324 nfds_t tids_get_listener(TIDS_INSTANCE *tids,
325 TIDS_REQ_FUNC *req_handler,
326 tids_auth_func *auth_handler,
327 const char *hostname,
336 tids->tids_port = port;
337 n_fd = tr_sock_listen_all(port, fd_out, max_fd);
340 tr_err("tids_get_listener: Error opening port %d");
342 /* opening port succeeded */
343 tr_info("tids_get_listener: Opened port %d.", port);
345 /* make this socket non-blocking */
346 for (ii=0; ii<n_fd; ii++) {
347 if (0 != fcntl(fd_out[ii], F_SETFL, O_NONBLOCK)) {
348 tr_err("tids_get_listener: Error setting O_NONBLOCK.");
349 for (ii=0; ii<n_fd; ii++) {
360 /* store the caller's request handler & cookie */
361 tids->req_handler = req_handler;
362 tids->auth_handler = auth_handler;
363 tids->hostname = hostname;
364 tids->cookie = cookie;
370 /* Accept and process a connection on a port opened with tids_get_listener() */
371 int tids_accept(TIDS_INSTANCE *tids, int listen)
376 if (0 > (conn = accept(listen, NULL, NULL))) {
377 perror("Error from TIDS Server accept()");
381 if (0 > (pid = fork())) {
382 perror("Error on fork()");
388 tr_gss_handle_connection(conn,
389 "trustidentity", tids->hostname, /* acceptor name */
390 tids->auth_handler, tids->cookie, /* auth callback and cookie */
391 tids_req_cb, tids /* req callback and cookie */
394 exit(0); /* exit to kill forked child process */
399 /* clean up any processes that have completed (TBD: move to main loop?) */
400 while (waitpid(-1, 0, WNOHANG) > 0);
405 /* Process tids requests forever. Should not return except on error. */
406 int tids_start (TIDS_INSTANCE *tids,
407 TIDS_REQ_FUNC *req_handler,
408 tids_auth_func *auth_handler,
409 const char *hostname,
413 int fd[TR_MAX_SOCKETS]={0};
415 struct pollfd poll_fd[TR_MAX_SOCKETS]={{0}};
418 n_fd = tids_get_listener(tids, req_handler, auth_handler, hostname, port, cookie, fd, TR_MAX_SOCKETS);
420 perror ("Error from tids_listen()");
424 tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
426 /* set up the poll structs */
427 for (ii=0; ii<n_fd; ii++) {
428 poll_fd[ii].fd=fd[ii];
429 poll_fd[ii].events=POLLIN;
432 while(1) { /* accept incoming conns until we are stopped */
433 /* clear out events from previous iteration */
434 for (ii=0; ii<n_fd; ii++)
435 poll_fd[ii].revents=0;
437 /* wait indefinitely for a connection */
438 if (poll(poll_fd, n_fd, -1) < 0) {
439 perror("Error from poll()");
443 /* fork handlers for any sockets that have data */
444 for (ii=0; ii<n_fd; ii++) {
445 if (poll_fd[ii].revents == 0)
448 if ((poll_fd[ii].revents & POLLERR) || (poll_fd[ii].revents & POLLNVAL)) {
449 perror("Error polling fd");
453 if (poll_fd[ii].revents & POLLIN) {
454 if (tids_accept(tids, poll_fd[ii].fd))
455 tr_err("tids_start: error in tids_accept().");
460 return 1; /* should never get here, loops "forever" */
463 void tids_destroy (TIDS_INSTANCE *tids)
465 /* clean up logfiles */