root / trunk / code / projects / colonet / ColonetServer / ColonetServer.cpp @ 152
History | View | Annotate | Download (6.88 KB)
1 | 29 | jknichel | /**
|
---|---|---|---|
2 | * @file ColonetServer.cpp
|
||
3 | 11 | emarinel | *
|
4 | * @brief colonet_server - primary server application for Colonet
|
||
5 | *
|
||
6 | * @author Jason Knichel
|
||
7 | * @author Eugene Marinelli
|
||
8 | * @date 10/31/06
|
||
9 | */
|
||
10 | |||
11 | 118 | emarinel | #include <arpa/inet.h> |
12 | #include <fcntl.h> |
||
13 | #include <errno.h> |
||
14 | #include <netinet/in.h> |
||
15 | #include <string.h> |
||
16 | 11 | emarinel | #include <sys/select.h> |
17 | #include <sys/socket.h> |
||
18 | |||
19 | 20 | jknichel | #include <colonet_wireless.h> |
20 | |||
21 | #include "includes/ColonetServer.h" |
||
22 | 11 | emarinel | #include "includes/ConnectionPool.h" |
23 | 142 | jknichel | #include "includes/wirelessMessageHandler.h" |
24 | 11 | emarinel | #include "includes/options.h" |
25 | 57 | jknichel | #include "includes/Log.h" |
26 | 11 | emarinel | |
27 | #define LISTEN_BACKLOG 5 |
||
28 | #define LOG_BUFFER_LENGTH 128 |
||
29 | |||
30 | 20 | jknichel | ConnectionPool * connection_pool; |
31 | |||
32 | 29 | jknichel | /**
|
33 | * @brief Default constructor for ColonetServer
|
||
34 | */
|
||
35 | 20 | jknichel | ColonetServer::ColonetServer(): logger("logFile.txt") {
|
36 | 24 | jknichel | listen_socket = 0;
|
37 | 20 | jknichel | } |
38 | |||
39 | 29 | jknichel | /**
|
40 | * @brief Destructor for ColonetServer
|
||
41 | */
|
||
42 | 20 | jknichel | ColonetServer::~ColonetServer() { |
43 | } |
||
44 | |||
45 | 29 | jknichel | /**
|
46 | * @brief Initializes the various elements needed for the server to run
|
||
47 | *
|
||
48 | * @param argc The number of command line arguments passed to the program
|
||
49 | * @param argv The command line arguments passed to the program
|
||
50 | *
|
||
51 | * @return 0 on success, negative error code on failure
|
||
52 | */
|
||
53 | 20 | jknichel | int ColonetServer::initialize_server(int argc, char * argv[]) { |
54 | printf("Initializing Server...\n");
|
||
55 | |||
56 | parseCmdLine(argc, argv); |
||
57 | |||
58 | 27 | jknichel | if (initialize_connection(optionsG.listen_port) < 0) { |
59 | 20 | jknichel | return -1; |
60 | 27 | jknichel | } |
61 | 20 | jknichel | |
62 | 22 | jknichel | if (initialize_wireless() < 0) { |
63 | 20 | jknichel | fprintf(stderr, "%s: initWireless failed\n", __FUNCTION__);
|
64 | return -1; |
||
65 | } |
||
66 | |||
67 | return 0; |
||
68 | } |
||
69 | |||
70 | 29 | jknichel | /**
|
71 | * @brief Starts the server listening on the socket that was opened for listening
|
||
72 | *
|
||
73 | * @return 0 on success, negative error code on failure
|
||
74 | */
|
||
75 | 25 | jknichel | int ColonetServer::start_listening() {
|
76 | if (listen(listen_socket, LISTEN_BACKLOG) < 0) { |
||
77 | 132 | jknichel | logger.log_error("\t\nThere was an error telling the socket to "
|
78 | 140 | jknichel | "listen for connections from clients. Terminating Server...\n");
|
79 | 25 | jknichel | return -1; |
80 | } |
||
81 | return 0; |
||
82 | } |
||
83 | 22 | jknichel | |
84 | 20 | jknichel | |
85 | 29 | jknichel | /**
|
86 | * @brief Starts the server running (starts an infinite loop)
|
||
87 | */
|
||
88 | 24 | jknichel | int ColonetServer::run_server() {
|
89 | 143 | jknichel | connection_pool.add_new_socket_to_pool(listen_socket); |
90 | 20 | jknichel | |
91 | 143 | jknichel | int accept_socket = 0; |
92 | struct sockaddr_in client_addr;
|
||
93 | socklen_t client_addr_size = sizeof(client_addr);
|
||
94 | 20 | jknichel | |
95 | 143 | jknichel | logger.log_message("Server initialized. About to start listening for connections");
|
96 | 11 | emarinel | |
97 | 143 | jknichel | while(1) { |
98 | connection_pool.perform_select(listen_socket); |
||
99 | 11 | emarinel | |
100 | 143 | jknichel | //either no descriptors are ready or there was an error
|
101 | if (connection_pool.get_number_clients_ready() <= 0) { |
||
102 | continue;
|
||
103 | } |
||
104 | 11 | emarinel | |
105 | 143 | jknichel | if (connection_pool.is_socket_ready_to_read(listen_socket)) {
|
106 | printf("Something is trying to connect...\n");
|
||
107 | if ((accept_socket = accept(listen_socket, (struct sockaddr*) &client_addr, &client_addr_size)) < 0) { |
||
108 | if (errno == EMFILE) {
|
||
109 | printf("\tWhen attempting to accept a connection, "
|
||
110 | "reached the per process limit of file descriptors."
|
||
111 | " Dropping the new connection.\n");
|
||
112 | continue;
|
||
113 | } else {
|
||
114 | printf("\tThere was an error when attempting to accept a connection");
|
||
115 | } |
||
116 | continue;
|
||
117 | 11 | emarinel | } |
118 | |||
119 | 143 | jknichel | char log_buffer[LOG_BUFFER_LENGTH];
|
120 | snprintf(log_buffer, LOG_BUFFER_LENGTH, "Client at address %s attempting to connect.",
|
||
121 | inet_ntoa(client_addr.sin_addr)); |
||
122 | logger.log_string(LOG_TYPE_CONNECT, log_buffer); |
||
123 | 11 | emarinel | |
124 | 143 | jknichel | if (connection_pool.add_client(accept_socket) < 0) { |
125 | printf("\tThere was an error when trying to add a client to the connection pool.");
|
||
126 | continue;
|
||
127 | 11 | emarinel | } |
128 | |||
129 | 143 | jknichel | snprintf(log_buffer, LOG_BUFFER_LENGTH, "Client at address %s successfully added to connection pool.",
|
130 | inet_ntoa(client_addr.sin_addr)); |
||
131 | logger.log_string(LOG_TYPE_CONNECT, log_buffer); |
||
132 | 11 | emarinel | } |
133 | 143 | jknichel | |
134 | if (connection_pool.check_clients() < 0) { |
||
135 | printf("\tThere was an error trying to update the clients.");
|
||
136 | continue;
|
||
137 | } |
||
138 | 11 | emarinel | } |
139 | |||
140 | 20 | jknichel | return 0; |
141 | 11 | emarinel | } |
142 | 20 | jknichel | |
143 | 140 | jknichel | int ColonetServer::process_received_wireless_message(unsigned char type, short source, int dest, |
144 | unsigned char * data, int len) { |
||
145 | if (type == COLONET_RESPONSE) {
|
||
146 | printf("response\n");
|
||
147 | |||
148 | char buffer[WRITE_BUFFER_SIZE];
|
||
149 | |||
150 | int value = (int)(data[0]); |
||
151 | snprintf(buffer, WRITE_BUFFER_SIZE, "%d\n", value);
|
||
152 | |||
153 | int buflen = strlen(buffer);
|
||
154 | if (connection_pool.write_to_client(dest, buffer, buflen)
|
||
155 | == ERROR_INVALID_CLIENT_ID) { |
||
156 | printf("The robot wanted to pass the data to a client not in the "
|
||
157 | "pool.\n");
|
||
158 | return -1; |
||
159 | } |
||
160 | |||
161 | printf("Put data in write buffer for client.\n");
|
||
162 | } else {
|
||
163 | printf("not a response\n");
|
||
164 | return -1; |
||
165 | } |
||
166 | |||
167 | return 0; |
||
168 | 20 | jknichel | } |
169 | 22 | jknichel | |
170 | 140 | jknichel | |
171 | 29 | jknichel | /**
|
172 | * @brief Initializes the wireless
|
||
173 | *
|
||
174 | * @return 0 on success, negative error code on error
|
||
175 | */
|
||
176 | 27 | jknichel | int ColonetServer::initialize_wireless() {
|
177 | 23 | jknichel | char* log_filename = NULL; |
178 | 22 | jknichel | |
179 | 23 | jknichel | if (optionsG.logging_enabled) {
|
180 | log_filename = optionsG.log_filename; |
||
181 | } |
||
182 | |||
183 | 127 | jknichel | /*
|
184 | colonet_wl_init(optionsG.wireless_port, wirelessMessageHandler,
|
||
185 | 140 | jknichel | log_filename);
|
186 | 23 | jknichel | |
187 | 140 | jknichel | if (!colonet_wl_run_listener_thread()) {
|
188 | 118 | emarinel | fprintf(stderr, "%s: colonet_wl_run_listener_thread failed.\n",
|
189 | 140 | jknichel | __FUNCTION__);
|
190 | 34 | emarinel | return -1;
|
191 | 140 | jknichel | }
|
192 | 127 | jknichel | */
|
193 | 23 | jknichel | |
194 | 34 | emarinel | return 0; |
195 | 23 | jknichel | } |
196 | |||
197 | 29 | jknichel | /**
|
198 | * @brief Initialize a connection to listen on
|
||
199 | *
|
||
200 | * @port The port to try to open to listen on
|
||
201 | *
|
||
202 | * @return 0 on success, negative error code on error
|
||
203 | */
|
||
204 | 27 | jknichel | int ColonetServer::initialize_connection(int port) { |
205 | 23 | jknichel | printf("Initializing connection that will be used to listen for "
|
206 | "clients...\n");
|
||
207 | 27 | jknichel | int options = 1; |
208 | struct sockaddr_in my_address;
|
||
209 | 23 | jknichel | |
210 | //get a socket fd
|
||
211 | 24 | jknichel | if ((listen_socket = socket(AF_INET, SOCK_STREAM, 0)) < 0) { |
212 | 23 | jknichel | printf("\tThere was an error creating a socket\n");
|
213 | return -1; |
||
214 | } |
||
215 | |||
216 | //set up the address struct
|
||
217 | 27 | jknichel | memset(&my_address,'\0',sizeof(my_address)); |
218 | my_address.sin_family = AF_INET; |
||
219 | my_address.sin_addr.s_addr = htonl(INADDR_ANY); |
||
220 | my_address.sin_port = htons(port); |
||
221 | 23 | jknichel | |
222 | 27 | jknichel | setsockopt(listen_socket, SOL_SOCKET, SO_REUSEADDR, &options, sizeof(options));
|
223 | 23 | jknichel | |
224 | //get the current socket options
|
||
225 | 27 | jknichel | if ((options = fcntl(listen_socket, F_GETFL)) < 0) { |
226 | 23 | jknichel | printf("\tThere was an error getting the socket options.\n");
|
227 | return -1; |
||
228 | } |
||
229 | |||
230 | //set the socket to non blocking
|
||
231 | 27 | jknichel | options = (options | O_NONBLOCK); |
232 | if (fcntl(listen_socket, F_SETFL, options) < 0) { |
||
233 | 23 | jknichel | printf("\tThere was an error setting the socket to be non blocking.\n");
|
234 | return -1; |
||
235 | } |
||
236 | |||
237 | //bind the socket to listen on the specified port
|
||
238 | 27 | jknichel | if (bind(listen_socket, (struct sockaddr *) &my_address, sizeof(my_address)) < 0) { |
239 | 23 | jknichel | printf("\tThere was an error binding the socket\n");
|
240 | return -1; |
||
241 | } |
||
242 | |||
243 | return 0; |
||
244 | } |
||
245 | |||
246 | 29 | jknichel | /**
|
247 | * @brief The main function of the server
|
||
248 | *
|
||
249 | * @param argc The number of command line arguments passed to the program
|
||
250 | * @param argv The command line arguments passed to the program
|
||
251 | *
|
||
252 | * @return 0 on success, negative error code on error
|
||
253 | */
|
||
254 | 140 | jknichel | ColonetServer colonet_server; |
255 | 24 | jknichel | int main(int argc, char** argv) { |
256 | |||
257 | if (colonet_server.initialize_server(argc, argv) < 0) { |
||
258 | 132 | jknichel | printf("\t\nThere was an error initializing the server. "
|
259 | 140 | jknichel | "Terminating server...\n");
|
260 | 24 | jknichel | return -1; |
261 | } |
||
262 | |||
263 | 25 | jknichel | if (colonet_server.start_listening() < 0) { |
264 | 24 | jknichel | return -1; |
265 | } |
||
266 | 25 | jknichel | |
267 | 24 | jknichel | colonet_server.run_server(); |
268 | |||
269 | return 0; |
||
270 | } |