*/
#include "ttt.h"
+#include "ttt-socket.h"
-static ttt_status_t
-_sockaddr_init (struct sockaddr_in *addr,
- const char *host,
- const char *port)
+static void
+ttt_dispatch (int connected_socket)
{
- struct hostent *hostent;
- struct servent *servent;
- char *endptr;
- long port_long;
- uint16_t port_short;
-
- addr->sin_family = AF_INET;
-
- hostent = gethostbyname (host);
- if (hostent == NULL)
- {
- fprintf (stderr, "Error: Lookup failed for host %s: %s\n",
- host, hstrerror (h_errno));
- return TTT_STATUS_FAILURE;
- }
- memcpy (&addr->sin_addr.s_addr, hostent->h_addr_list[0],
- sizeof (addr->sin_addr.s_addr));
-
- assert (*port != '\0');
- port_long = strtol (port, &endptr, 10);
- if (*endptr == '\0')
- {
- /* Numeric port*/
- if (port_long <= 0 || port_long >= (1 << 16)) {
- fprintf (stderr, "Error: Port %ld out of range.\n", port_long);
- return TTT_STATUS_FAILURE;
- }
- port_short = port_long;
- addr->sin_port = htons (port_short);
- } else {
- /* Named port */
- servent = getservbyname (port, "tcp");
- if (port == NULL) {
- fprintf (stderr, "Error: Lookup failed for port %s: %s\n",
- port, hstrerror (h_errno));
- return TTT_STATUS_FAILURE;
- }
- addr->sin_port = servent->s_port;
- }
-
- return TTT_STATUS_SUCCESS;
-}
-
-static int
-_wait_for_connection (int listen_socket)
-{
- fd_set read_set;
- int num_selected;
- int flags, err;
- int connected_socket;
-
- FD_ZERO (&read_set);
- FD_SET (listen_socket, &read_set);
+#define BUF_SIZE 1024
while (1) {
- num_selected = select (listen_socket + 1,
- &read_set, NULL, NULL,
- NULL);
-
- flags = fcntl (listen_socket, F_GETFL);
- flags |= O_NONBLOCK;
- xfcntl (listen_socket, F_SETFL, flags);
-
- connected_socket = accept (listen_socket, 0, 0);
- err = errno;
-
- flags &= ~O_NONBLOCK;
- xfcntl (listen_socket, F_SETFL, flags);
-
- if (connected_socket != -1)
- return connected_socket;
-
- if (err == EWOULDBLOCK || err == EAGAIN)
- continue;
-
- fprintf (stderr, "Error: accept failed: %s. Aborting.\n",
- strerror (err));
- exit (1);
+ char buf[BUF_SIZE];
+ int cnt;
+ cnt = read (connected_socket, buf, BUF_SIZE);
+ if (cnt == 0)
+ break;
+ write (0, buf, cnt);
+ write (connected_socket, buf, cnt);
}
}
static const char *WELCOME_MESSAGE =
"Welcome to ttt-server. So far, this program is simply a demonstration\n"
-"of a one-shot TCP/IP server. The server is currently listening on:\n"
+"of a TCP/IP server that handles one client at a time. The server is\n"
+"currently listening on:\n"
"\n %s:%s\n"
"\nTo test this program, simply connect a client to that host and port.\n"
"For example:\n"
"<Enter>, then \"close\" (and <Enter>) at the \"telnet> \" prompt.\n"
"\nHave fun!\n"
"-Carl\n"
-"\nPS. By one-shot, I mean that the server will only accept a connection\n"
-"from a single client, and the server will exit when that client disconnects\n"
-"To test the server again, you will need to manually restart it again.\n"
-"Extending the server to start listening again, or to handle multiple\n"
-"clients simultaneously would both be fun projects for a motivated\n"
-"student (as would writing a custom client program).\n\n";
+"\nPS. The server handles only one client at a time, but multiple clients\n"
+"may be able to connect simultaneously. Subsequent clients will see no\n"
+"output from the server until all previous clients exit.\n"
+"\nExtending the server to fork a new process for each client would be a fun\n"
+"project for a motivated student (as would writing a custom client program).\n\n";
int
main (int argc, char **argv)
{
ttt_args_t args;
- int args_first;
- int listen_socket, connected_socket;
- struct sockaddr_in addr;
-
- ttt_args_parse (&args, argc, argv, &args_first);
-
- listen_socket = xsocket (PF_INET, SOCK_STREAM, 0);
-
-#define HOST "localhost"
-#define PORT "5534"
-
- _sockaddr_init (&addr, HOST, PORT);
-
-#ifdef SO_REUSEADDR
- {
- int one = 1;
- setsockopt (listen_socket, SOL_SOCKET,
- SO_REUSEADDR, (char *) &one, sizeof (int));
- }
-#endif
-
- xbind (listen_socket, (struct sockaddr *) &addr, sizeof (addr));
+ int socket;
- xlisten (listen_socket, SOMAXCONN);
+ ttt_args_parse (&args, argc, argv);
- printf (WELCOME_MESSAGE, HOST, PORT, HOST, PORT);
+ if (args.log_file)
+ stderr = xfreopen (args.log_file, "a", stderr);
- connected_socket = _wait_for_connection (listen_socket);
+ socket = ttt_socket_create_server (args.host, args.port);
-#define BUF_SIZE 1024
+ printf (WELCOME_MESSAGE, args.host, args.port, args.host, args.port);
- while (1) {
- char buf[BUF_SIZE];
- int cnt;
- cnt = read (connected_socket, buf, BUF_SIZE);
- if (cnt == 0)
- break;
- write (0, buf, cnt);
- write (connected_socket, buf, cnt);
- }
+ while (1)
+ ttt_socket_accept (socket, ttt_dispatch);
- return 0;
+ /* We only reach here if something bad happened. */
+ return 1;
}