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40 #include <sys/socket.h>
45 #include <tid_internal.h>
49 #include <tr_socket.h>
54 * Create a response with minimal fields filled in
56 * @param mem_ctx talloc context for the return value
57 * @param req request to respond to
58 * @return new response structure allocated in the mem_ctx context
60 static TID_RESP *tids_create_response(TALLOC_CTX *mem_ctx, TID_REQ *req)
65 if (NULL == (resp = tid_resp_new(mem_ctx))) {
66 tr_crit("tids_create_response: Error allocating response structure.");
70 resp->result = TID_SUCCESS; /* presume success */
71 if ((NULL == (resp->rp_realm = tr_dup_name(req->rp_realm))) ||
72 (NULL == (resp->realm = tr_dup_name(req->realm))) ||
73 (NULL == (resp->comm = tr_dup_name(req->comm)))) {
74 tr_crit("tids_create_response: Error allocating fields in response.");
78 if (NULL == (resp->orig_coi = tr_dup_name(req->orig_coi))) {
79 tr_crit("tids_create_response: Error allocating fields in response.");
87 if ((!success) && (resp!=NULL)) {
94 static int tids_handle_request(TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
98 /* Check that this is a valid TID Request. If not, send an error return. */
100 (!(req->rp_realm)) ||
103 tr_notice("tids_handle_request(): Not a valid TID Request.");
104 resp->result = TID_ERROR;
105 resp->err_msg = tr_new_name("Bad request format");
109 tr_debug("tids_handle_request: adding self to req path.");
110 tid_req_add_path(req, tids->hostname, tids->tids_port);
112 /* Call the caller's request handler */
113 /* TBD -- Handle different error returns/msgs */
114 if (0 > (rc = (*tids->req_handler)(tids, req, resp, tids->cookie))) {
115 /* set-up an error response */
116 tr_debug("tids_handle_request: req_handler returned error.");
117 resp->result = TID_ERROR;
118 if (!resp->err_msg) /* Use msg set by handler, if any */
119 resp->err_msg = tr_new_name("Internal processing error");
122 /* set-up a success response */
123 tr_debug("tids_handle_request: req_handler returned success.");
124 resp->result = TID_SUCCESS;
125 resp->err_msg = NULL; /* No error msg on successful return */
132 * Produces a JSON-encoded msg containing the TID response
134 * @param mem_ctx talloc context for the return value
135 * @param resp outgoing response
136 * @return JSON-encoded message containing the TID response
138 static char *tids_encode_response(TALLOC_CTX *mem_ctx, TID_RESP *resp)
141 char *resp_buf = NULL;
143 /* Construct the response message */
144 mresp.msg_type = TID_RESPONSE;
145 tr_msg_set_resp(&mresp, resp);
147 /* Encode the message to JSON */
148 resp_buf = tr_msg_encode(mem_ctx, &mresp);
149 if (resp_buf == NULL) {
150 tr_err("tids_encode_response: Error encoding json response.");
153 tr_debug("tids_encode_response: Encoded response: %s", resp_buf);
160 * Encode/send an error response
162 * Part of the public interface
169 int tids_send_err_response (TIDS_INSTANCE *tids, TID_REQ *req, const char *err_msg) {
170 TID_RESP *resp = NULL;
173 if ((!tids) || (!req) || (!err_msg)) {
174 tr_debug("tids_send_err_response: Invalid parameters.");
178 /* If we already sent a response, don't send another no matter what. */
182 if (NULL == (resp = tids_create_response(req, req))) {
183 tr_crit("tids_send_err_response: Can't create response.");
187 /* mark this as an error response, and include the error message */
188 resp->result = TID_ERROR;
189 resp->err_msg = tr_new_name((char *)err_msg);
190 resp->error_path = req->path;
192 rc = tids_send_response(tids, req, resp);
199 * Encode/send a response
201 * Part of the public interface
203 * @param tids not actually used, but kept for ABI compatibility
208 int tids_send_response (TIDS_INSTANCE *tids, TID_REQ *req, TID_RESP *resp)
213 if ((!tids) || (!req) || (!resp)) {
214 tr_debug("tids_send_response: Invalid parameters.");
218 /* Never send a second response if we already sent one. */
222 resp_buf = tids_encode_response(NULL, NULL);
223 if (resp_buf == NULL) {
224 tr_err("tids_send_response: Error encoding json response.");
229 tr_debug("tids_send_response: Encoded response: %s", resp_buf);
231 /* If external logging is enabled, fire off a message */
232 /* TODO Can be moved to end once segfault in gsscon_write_encrypted_token fixed */
235 /* Send the response over the connection */
236 err = gsscon_write_encrypted_token (req->conn, req->gssctx, resp_buf,
237 strlen(resp_buf) + 1);
239 tr_notice("tids_send_response: Error sending response over connection.");
244 /* indicate that a response has been sent for this request */
253 * Callback to process a request and produce a response
255 * @param req_str JSON-encoded request
256 * @param data pointer to a TIDS_INSTANCE
257 * @return pointer to the response string or null to send no response
259 static char *tids_req_cb(TALLOC_CTX *mem_ctx, const char *req_str, void *data)
261 TIDS_INSTANCE *tids = talloc_get_type_abort(data, TIDS_INSTANCE);
264 TID_RESP *resp = NULL;
265 char *resp_str = NULL;
268 mreq = tr_msg_decode(req_str, strlen(req_str)); // allocates memory on success!
270 tr_debug("tids_req_cb: Error decoding request.");
274 /* If this isn't a TID Request, just drop it. */
275 if (mreq->msg_type != TID_REQUEST) {
276 tr_msg_free_decoded(mreq);
277 tr_debug("tids_req_cb: Not a TID request, dropped.");
281 /* Get a handle on the request itself. Don't free req - it belongs to mreq */
282 req = tr_msg_get_req(mreq);
284 /* Allocate a response structure and populate common fields. The resp is in req's talloc context,
285 * which will be cleaned up when mreq is freed. */
286 resp = tids_create_response(req, req);
288 /* If we were unable to create a response, we cannot reply. Log an
289 * error if we can, then drop the request. */
290 tr_msg_free_decoded(mreq);
291 tr_crit("tids_req_cb: Error creating response structure.");
295 /* Handle the request and fill in resp */
296 rc = tids_handle_request(tids, req, resp);
298 tr_debug("tids_req_cb: Error from tids_handle_request(), rc = %d.", rc);
299 /* Fall through, to send the response, either way */
302 /* Convert the completed response into an encoded response */
303 resp_str = tids_encode_response(mem_ctx, NULL);
305 /* Finished; free the request and return */
306 tr_msg_free_decoded(mreq); // this frees req and resp, too
310 TIDS_INSTANCE *tids_new(TALLOC_CTX *mem_ctx)
312 return talloc_zero(mem_ctx, TIDS_INSTANCE);
316 * Create a new TIDS instance
318 * Deprecated: exists for ABI compatibility, but tids_new() should be used instead
321 TIDS_INSTANCE *tids_create(void)
323 return talloc_zero(NULL, TIDS_INSTANCE);
325 /* Get a listener for tids requests, returns its socket fd. Accept
326 * connections with tids_accept() */
327 nfds_t tids_get_listener(TIDS_INSTANCE *tids,
328 TIDS_REQ_FUNC *req_handler,
329 tids_auth_func *auth_handler,
330 const char *hostname,
339 tids->tids_port = port;
340 n_fd = tr_sock_listen_all(port, fd_out, max_fd);
343 tr_err("tids_get_listener: Error opening port %d");
345 /* opening port succeeded */
346 tr_info("tids_get_listener: Opened port %d.", port);
348 /* make this socket non-blocking */
349 for (ii=0; ii<n_fd; ii++) {
350 if (0 != fcntl(fd_out[ii], F_SETFL, O_NONBLOCK)) {
351 tr_err("tids_get_listener: Error setting O_NONBLOCK.");
352 for (ii=0; ii<n_fd; ii++) {
363 /* store the caller's request handler & cookie */
364 tids->req_handler = req_handler;
365 tids->auth_handler = auth_handler;
366 tids->hostname = hostname;
367 tids->cookie = cookie;
373 /* Accept and process a connection on a port opened with tids_get_listener() */
374 int tids_accept(TIDS_INSTANCE *tids, int listen)
379 if (0 > (conn = accept(listen, NULL, NULL))) {
380 perror("Error from TIDS Server accept()");
384 if (0 > (pid = fork())) {
385 perror("Error on fork()");
391 tr_gss_handle_connection(conn,
392 "trustidentity", tids->hostname, /* acceptor name */
393 tids->auth_handler, tids->cookie, /* auth callback and cookie */
394 tids_req_cb, tids /* req callback and cookie */
397 exit(0); /* exit to kill forked child process */
402 /* clean up any processes that have completed (TBD: move to main loop?) */
403 while (waitpid(-1, 0, WNOHANG) > 0);
408 /* Process tids requests forever. Should not return except on error. */
409 int tids_start (TIDS_INSTANCE *tids,
410 TIDS_REQ_FUNC *req_handler,
411 tids_auth_func *auth_handler,
412 const char *hostname,
416 int fd[TR_MAX_SOCKETS]={0};
418 struct pollfd poll_fd[TR_MAX_SOCKETS]={{0}};
421 n_fd = tids_get_listener(tids, req_handler, auth_handler, hostname, port, cookie, fd, TR_MAX_SOCKETS);
423 perror ("Error from tids_listen()");
427 tr_info("Trust Path Query Server starting on host %s:%d.", hostname, port);
429 /* set up the poll structs */
430 for (ii=0; ii<n_fd; ii++) {
431 poll_fd[ii].fd=fd[ii];
432 poll_fd[ii].events=POLLIN;
435 while(1) { /* accept incoming conns until we are stopped */
436 /* clear out events from previous iteration */
437 for (ii=0; ii<n_fd; ii++)
438 poll_fd[ii].revents=0;
440 /* wait indefinitely for a connection */
441 if (poll(poll_fd, n_fd, -1) < 0) {
442 perror("Error from poll()");
446 /* fork handlers for any sockets that have data */
447 for (ii=0; ii<n_fd; ii++) {
448 if (poll_fd[ii].revents == 0)
451 if ((poll_fd[ii].revents & POLLERR) || (poll_fd[ii].revents & POLLNVAL)) {
452 perror("Error polling fd");
456 if (poll_fd[ii].revents & POLLIN) {
457 if (tids_accept(tids, poll_fd[ii].fd))
458 tr_err("tids_start: error in tids_accept().");
463 return 1; /* should never get here, loops "forever" */
466 void tids_destroy (TIDS_INSTANCE *tids)
468 /* clean up logfiles */