2 * Copyright (c) 2018, JANET(UK)
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6 * modification, are permitted provided that the following conditions
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17 * may be used to endorse or promote products derived from this software
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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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, MONS_REQ_FUNC *req_handler, MONS_AUTH_FUNC *auth_handler, const char *hostname,
102 unsigned int port, void *cookie, int *fd_out, size_t max_fd)
108 n_fd = tr_sock_listen_all(port, fd_out, max_fd);
110 tr_err("mons_get_listener: Error opening port %d");
112 /* opening port succeeded */
113 tr_info("mons_get_listener: Opened port %d.", port);
115 /* make this socket non-blocking */
116 for (ii=0; ii<n_fd; ii++) {
117 if (0 != fcntl(fd_out[ii], F_SETFL, O_NONBLOCK)) {
118 tr_err("mons_get_listener: Error setting O_NONBLOCK.");
119 for (ii=0; ii<n_fd; ii++) {
130 /* store the caller's request handler & cookie */
131 mons->req_handler = req_handler;
132 mons->auth_handler = auth_handler;
133 mons->hostname = hostname;
134 mons->cookie = cookie;
141 * Accept and process a connection on a port opened with mons_get_listener()
143 * @param mons monitoring interface instance
144 * @param listen FD of the connection socket
145 * @return 0 on success
147 int mons_accept(MONS_INSTANCE *mons, int listen)
152 if (0 > (conn = accept(listen, NULL, NULL))) {
153 perror("Error from monitoring interface accept()");
157 if (0 > (pid = fork())) {
158 perror("Error on fork()");
164 tr_gss_handle_connection(conn,
165 "trustmonitor", mons->hostname, /* acceptor name */
166 mons->auth_handler, mons->cookie, /* auth callback and cookie */
167 mons_req_cb, mons /* req callback and cookie */
170 exit(0); /* exit to kill forked child process */
175 /* clean up any processes that have completed */
176 while (waitpid(-1, 0, WNOHANG) > 0);