2 * Copyright (c) 2018, JANET(UK)
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6 * modification, are permitted provided that the following conditions
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42 #include <mon_internal.h>
43 #include <tr_socket.h>
48 * Allocate a new MONS_INSTANCE
50 * @param mem_ctx talloc context for allocation
51 * @return new MONS_INSTANCE or null on failure
53 MONS_INSTANCE *mons_new(TALLOC_CTX *mem_ctx)
55 MONS_INSTANCE *mons = talloc(mem_ctx, MONS_INSTANCE);
58 mons->hostname = NULL;
62 mons->req_handler = NULL;
63 mons->auth_handler = NULL;
65 mons->authorized_gss_names = tr_gss_names_new(mons);
66 if (mons->authorized_gss_names == NULL) {
75 * Callback to process a request and produce a response
77 * @param req_str JSON-encoded request
78 * @param data pointer to a MONS_INSTANCE
79 * @return pointer to the response string or null to send no response
81 static char *mons_req_cb(TALLOC_CTX *mem_ctx, const char *req_str, void *data)
83 return "This is a response.";
87 * Create a listener for monitoring requests
89 * Accept connections with mons_accept()
91 * @param mons monitoring server instance
101 int mons_get_listener(MONS_INSTANCE *mons,
102 MONS_REQ_FUNC *req_handler,
103 MONS_AUTH_FUNC *auth_handler,
113 n_fd = tr_sock_listen_all(port, fd_out, max_fd);
115 tr_err("mons_get_listener: Error opening port %d");
117 /* opening port succeeded */
118 tr_info("mons_get_listener: Opened port %d.", port);
120 /* make this socket non-blocking */
121 for (ii=0; ii<n_fd; ii++) {
122 if (0 != fcntl(fd_out[ii], F_SETFL, O_NONBLOCK)) {
123 tr_err("mons_get_listener: Error setting O_NONBLOCK.");
124 for (ii=0; ii<n_fd; ii++) {
135 /* store the caller's request handler & cookie */
136 mons->req_handler = req_handler;
137 mons->auth_handler = auth_handler;
138 mons->cookie = cookie;
145 * Accept and process a connection on a port opened with mons_get_listener()
147 * @param mons monitoring interface instance
148 * @param listen FD of the connection socket
149 * @return 0 on success
151 int mons_accept(MONS_INSTANCE *mons, int listen)
156 if (0 > (conn = accept(listen, NULL, NULL))) {
157 perror("Error from monitoring interface accept()");
161 if (0 > (pid = fork())) {
162 perror("Error on fork()");
168 tr_gss_handle_connection(conn,
169 "trustmonitor", mons->hostname, /* acceptor name */
170 mons->auth_handler, mons->cookie, /* auth callback and cookie */
171 mons_req_cb, mons /* req callback and cookie */
174 exit(0); /* exit to kill forked child process */
179 /* clean up any processes that have completed */
180 while (waitpid(-1, 0, WNOHANG) > 0);