int main(int argc, char *argv[])
{
int listen_sock;
struct sockaddr_in addr;
//telnet_t *telnet;
//struct sockaddr_in client_addr;
socklen_t addrlen;
int rs;
struct pollfd pfd[2];
char buffer[512];
memset(&pfd, 0, sizeof(pfd));
if((listen_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("cant open socket\n");
exit(errno);
}
setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, (void*)&rs, sizeof(rs));
rs = 1;
//bzero(&self, sizeof(self));
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(MY_PORT);
addr.sin_addr.s_addr = INADDR_ANY;
if( bind(listen_sock, (struct sockaddr*)&addr, sizeof(addr)) != 0 )
{
perror("cant bind");
exit(errno);
}
if( listen(listen_sock, 20) != 0 )
{
perror("cant listen");
exit(errno);
}
pfd[1].fd = listen_sock;
pfd[1].events = POLLIN;
while(1)
{
if(user.sock != -1)
{
pfd[0].fd = user.sock;
pfd[0].events = POLLIN;
}
else
{
pfd[0].fd = -1;
pfd[0].events = 0;
}
rs = poll(pfd, 2, -1);
if(rs == -1 && errno == EINTR)
{
printf("Poll failed\n");
return 1;
}
if(pfd[1].revents & POLLIN)
{
addrlen = sizeof(addr);
if((rs = accept(listen_sock, (struct sockaddr*)&addr, &addrlen)) == -1)
{
fprintf(stderr, "accept() failed %d.\n", errno);
return 1;
}
printf("Connected client: %s:%d\n", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
user.sock = rs;
user.telnet = telnet_init(telopts, _event_handler, 0, &user);
telnet_negotiate(user.telnet, TELNET_DO, TELNET_TELOPT_NAWS);
}
if(pfd[0].revents & POLLIN)
{
if( (rs = recv(user.sock, buffer, sizeof(buffer), 0)) > 0)
{
telnet_recv(user.telnet, buffer, sizeof(buffer));
}
else if(rs == 0)
{
printf("connection closed\n");
close(user.sock);
telnet_free(user.telnet);
user.sock = -1;
break;
}
else if(errno != EINTR)
{
fprintf(stderr, "recv() failed\n");
exit(1);
}
}
//send(clientfd, "Hello, world!", sizeof("Hello, world!"), 0);
}
close(listen_sock);
return 0;
}
int main(int argc, char **argv) {
char buffer[512];
short listen_port;
int listen_sock;
int rs;
int i;
struct sockaddr_in addr;
socklen_t addrlen;
struct pollfd pfd[MAX_USERS + 1];
/* initialize Winsock */
#if defined(_WIN32)
WSADATA wsd;
WSAStartup(MAKEWORD(2, 2), &wsd);
#endif
/* check usage */
if (argc != 2) {
fprintf(stderr, "Usage:\n ./telnet-chatd <port>\n");
return 1;
}
/* initialize data structures */
memset(&pfd, 0, sizeof(pfd));
memset(users, 0, sizeof(users));
for (i = 0; i != MAX_USERS; ++i)
users[i].sock = -1;
/* parse listening port */
listen_port = (short)strtol(argv[1], 0, 10);
/* create listening socket */
if ((listen_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
fprintf(stderr, "socket() failed: %s\n", strerror(errno));
return 1;
}
/* reuse address option */
rs = 1;
setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, (void*)&rs, sizeof(rs));
/* bind to listening addr/port */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(listen_port);
if (bind(listen_sock, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
fprintf(stderr, "bind() failed: %s\n", strerror(errno));
return 1;
}
/* listen for clients */
if (listen(listen_sock, 5) == -1) {
fprintf(stderr, "listen() failed: %s\n", strerror(errno));
return 1;
}
printf("LISTENING ON PORT %d\n", listen_port);
/* initialize listening descriptors */
pfd[MAX_USERS].fd = listen_sock;
pfd[MAX_USERS].events = POLLIN;
/* loop for ever */
for (;;) {
/* prepare for poll */
for (i = 0; i != MAX_USERS; ++i) {
if (users[i].sock != -1) {
pfd[i].fd = users[i].sock;
pfd[i].events = POLLIN;
} else {
pfd[i].fd = -1;
pfd[i].events = 0;
}
}
/* poll */
rs = poll(pfd, MAX_USERS + 1, -1);
if (rs == -1 && errno != EINTR) {
fprintf(stderr, "poll() failed: %s\n", strerror(errno));
return 1;
}
/* new connection */
if (pfd[MAX_USERS].revents & POLLIN) {
/* acept the sock */
addrlen = sizeof(addr);
if ((rs = accept(listen_sock, (struct sockaddr *)&addr,
&addrlen)) == -1) {
fprintf(stderr, "accept() failed: %s\n", strerror(errno));
return 1;
}
printf("Connection received.\n");
/* find a free user */
for (i = 0; i != MAX_USERS; ++i)
if (users[i].sock == -1)
break;
if (i == MAX_USERS) {
printf(" rejected (too many users)\n");
_send(rs, "Too many users.\r\n", 14);
close(rs);
}
/* init, welcome */
users[i].sock = rs;
users[i].telnet = telnet_init(telopts, _event_handler, 0,
&users[i]);
telnet_negotiate(users[i].telnet, TELNET_WILL,
TELNET_TELOPT_COMPRESS2);
telnet_printf(users[i].telnet, "Enter name: ");
}
/* read from client */
for (i = 0; i != MAX_USERS; ++i) {
/* skip users that aren't actually connected */
if (users[i].sock == -1)
continue;
if (pfd[i].revents & POLLIN) {
if ((rs = recv(users[i].sock, buffer, sizeof(buffer), 0)) > 0) {
telnet_recv(users[i].telnet, buffer, rs);
} else if (rs == 0) {
printf("Connection closed.\n");
close(users[i].sock);
if (users[i].name != 0) {
_message(users[i].name, "** HAS DISCONNECTED **");
free(users[i].name);
users[i].name = 0;
}
telnet_free(users[i].telnet);
users[i].sock = -1;
break;
} else if (errno != EINTR) {
fprintf(stderr, "recv(client) failed: %s\n",
strerror(errno));
exit(1);
}
}
}
}
/* not that we can reach this, but GCC will cry if it's not here */
return 0;
}
