4 * This contains a simple multithreaded TCP server manager. It sits around
5 * waiting on the specified port for incoming HTTP connections. When a
6 * connection is established, it calls context_loop() from context_loop.c.
21 #include <sys/types.h>
23 #include <sys/socket.h>
24 #ifdef HAVE_SYS_TIME_H
30 #include <netinet/in.h>
41 int vsnprintf(char *buf, size_t max, const char *fmt, va_list argp);
44 int msock; /* master listening socket */
45 extern void *context_loop(int);
46 extern void *housekeeping_loop(void);
47 extern pthread_mutex_t SessionListMutex;
48 extern pthread_key_t MyConKey;
54 char *defaulthost = DEFAULT_HOST;
55 char *defaultport = DEFAULT_PORT;
57 pthread_mutex_t AcceptQueue;
60 * This is a generic function to set up a master socket for listening on
61 * a TCP port. The server shuts down if the bind fails.
63 int ig_tcp_server(int port_number, int queue_len)
65 struct sockaddr_in sin;
68 memset(&sin, 0, sizeof(sin));
69 sin.sin_family = AF_INET;
70 sin.sin_addr.s_addr = INADDR_ANY;
72 if (port_number == 0) {
74 "webcit: Cannot start: no port number specified.\n");
77 sin.sin_port = htons((u_short) port_number);
79 s = socket(PF_INET, SOCK_STREAM, (getprotobyname("tcp")->p_proto));
81 fprintf(stderr, "webcit: Can't create a socket: %s\n",
85 /* Set some socket options that make sense. */
87 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
89 if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
90 fprintf(stderr, "webcit: Can't bind: %s\n", strerror(errno));
93 if (listen(s, queue_len) < 0) {
94 fprintf(stderr, "webcit: Can't listen: %s\n", strerror(errno));
102 * Read data from the client socket.
104 * 1 Requested number of bytes has been read.
105 * 0 Request timed out.
106 * -1 Connection is broken, or other error.
108 int client_read_to(int sock, char *buf, int bytes, int timeout)
116 while (len < bytes) {
122 retval = select((sock) + 1,
123 &rfds, NULL, NULL, &tv);
124 if (FD_ISSET(sock, &rfds) == 0) {
127 rlen = read(sock, &buf[len], bytes - len);
129 fprintf(stderr, "client_read() failed: %s\n",
139 * Read data from the client socket with default timeout.
140 * (This is implemented in terms of client_read_to() and could be
141 * justifiably moved out of sysdep.c)
143 int client_read(int sock, char *buf, int bytes)
145 return (client_read_to(sock, buf, bytes, SLEEPING));
150 * client_gets() ... Get a LF-terminated line of text from the client.
151 * (This is implemented in terms of client_read() and could be
152 * justifiably moved out of sysdep.c)
154 int client_gets(int sock, char *buf)
158 /* Read one character at a time.
161 retval = client_read(sock, &buf[i], 1);
162 if (retval != 1 || buf[i] == '\n' || i == 255)
166 /* If we got a long line, discard characters until the newline.
169 while (buf[i] != '\n' && retval == 1)
170 retval = client_read(sock, &buf[i], 1);
173 * Strip any trailing not-printable characters.
176 while ((strlen(buf) > 0) && (!isprint(buf[strlen(buf) - 1]))) {
177 buf[strlen(buf) - 1] = 0;
184 * Start running as a daemon. Only close stdio if do_close_stdio is set.
186 void start_daemon(int do_close_stdio)
188 if (do_close_stdio) {
193 signal(SIGHUP, SIG_IGN);
194 signal(SIGINT, SIG_IGN);
195 signal(SIGQUIT, SIG_IGN);
200 void spawn_another_worker_thread() {
201 pthread_t SessThread; /* Thread descriptor */
202 pthread_attr_t attr; /* Thread attributes */
204 fprintf(stderr, "Creating a new thread\n");
206 /* set attributes for the new thread */
207 pthread_attr_init(&attr);
208 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
210 /* now create the thread */
211 if (pthread_create(&SessThread, &attr,
212 (void *(*)(void *)) worker_entry, NULL)
214 fprintf(stderr, "webcit: can't create thread: %s\n",
220 * Here's where it all begins.
222 int main(int argc, char **argv)
224 pthread_t SessThread; /* Thread descriptor */
225 pthread_attr_t attr; /* Thread attributes */
226 int a, i; /* General-purpose variables */
227 int port = PORT_NUM; /* Port to listen on */
228 char tracefile[PATH_MAX];
230 /* Parse command line */
231 while ((a = getopt(argc, argv, "hp:t:")) != EOF)
237 strcpy(tracefile, optarg);
238 freopen(tracefile, "w", stdout);
239 freopen(tracefile, "w", stderr);
240 freopen(tracefile, "r", stdin);
243 fprintf(stderr, "usage: webserver [-p localport] "
245 "[remotehost [remoteport]]\n");
250 defaulthost = argv[optind];
252 defaultport = argv[optind];
254 /* Tell 'em who's in da house */
255 fprintf(stderr, SERVER "\n"
256 "Copyright (C) 1996-1999. All rights reserved.\n\n");
258 if (chdir(WEBCITDIR) != 0)
262 * Set up a place to put thread-specific data.
263 * We only need a single pointer per thread - it points to the
264 * wcsession struct to which the thread is currently bound.
266 if (pthread_key_create(&MyConKey, NULL) != 0) {
267 fprintf(stderr, "Can't create TSD key: %s\n", strerror(errno));
271 * Bind the server to our favorite port.
272 * There is no need to check for errors, because ig_tcp_server()
273 * exits if it doesn't succeed.
275 fprintf(stderr, "Attempting to bind to port %d...\n", port);
276 msock = ig_tcp_server(port, LISTEN_QUEUE_LENGTH);
277 fprintf(stderr, "Listening on socket %d\n", msock);
278 signal(SIGPIPE, SIG_IGN);
280 pthread_mutex_init(&SessionListMutex, NULL);
281 pthread_mutex_init(&AcceptQueue, NULL);
284 * Start up the housekeeping thread
286 pthread_attr_init(&attr);
287 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
288 pthread_create(&SessThread, &attr,
289 (void *(*)(void *)) housekeeping_loop, NULL);
292 /* Start a few initial worker threads */
293 for (i=0; i<(INITIAL_WORKER_THREADS-1); ++i) {
294 spawn_another_worker_thread();
298 /* now the original thread becomes an ordinary worker thread */
305 * Entry point for worker threads
307 void worker_entry(void) {
309 struct sockaddr_in fsin;
313 time_t start_time, stop_time;
316 /* Only one thread can accept at a time */
317 start_time = time(NULL);
318 pthread_mutex_lock(&AcceptQueue);
319 ssock = accept(msock, (struct sockaddr *) &fsin, &alen);
320 pthread_mutex_unlock(&AcceptQueue);
321 stop_time = time(NULL);
323 /* Augment the thread pool if we're not blocking at all */
324 if ( (stop_time - start_time) == 0L) {
325 spawn_another_worker_thread();
329 fprintf(stderr, "webcit: accept() failed: %s\n",
332 /* Set the SO_REUSEADDR socket option */
334 setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR,
339 } while (!time_to_die);