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/*
* Dropbear SSH
*
* Copyright (c) 2002,2003 Matt Johnston
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE. */

#include "includes.h"
#include "listener.h"
#include "session.h"
#include "dbutil.h"

void listeners_initialise() {

/* just one slot to start with */
ses.listeners = (struct Listener**)m_malloc(sizeof(struct Listener*));
ses.listensize = 1;
ses.listeners[0] = NULL;

}

void set_listener_fds(fd_set * readfds) {

unsigned int i, j;
struct Listener *listener;

/* check each in turn */
for (i = 0; i < ses.listensize; i++) {
listener = ses.listeners[i];
if (listener != NULL) {
for (j = 0; j < listener->nsocks; j++) {
FD_SET(listener->socks[j], readfds);
}
}
}
}


void handle_listeners(fd_set * readfds) {

unsigned int i, j;
struct Listener *listener;
int sock;

/* check each in turn */
for (i = 0; i < ses.listensize; i++) {
listener = ses.listeners[i];
if (listener != NULL) {
for (j = 0; j < listener->nsocks; j++) {
sock = listener->socks[j];
if (FD_ISSET(sock, readfds)) {
listener->acceptor(listener, sock);
}
}
}
}
} /* Woo brace matching */


/* acceptor(int fd, void* typedata) is a function to accept connections,
* cleanup(void* typedata) happens when cleaning up */
struct Listener* new_listener(int socks[], unsigned int nsocks,
int type, void* typedata,
void (*acceptor)(struct Listener* listener, int sock),
void (*cleanup)(struct Listener*)) {

unsigned int i, j;
struct Listener *newlisten = NULL;
/* try get a new structure to hold it */
for (i = 0; i < ses.listensize; i++) {
if (ses.listeners[i] == NULL) {
break;
}
}

/* or create a new one */
if (i == ses.listensize) {
if (ses.listensize > MAX_LISTENERS) {
TRACE(("leave newlistener: too many already"))
for (j = 0; j < nsocks; j++) {
close(socks[i]);
}
return NULL;
}

ses.listeners = (struct Listener**)m_realloc(ses.listeners,
(ses.listensize+LISTENER_EXTEND_SIZE)
*sizeof(struct Listener*));

ses.listensize += LISTENER_EXTEND_SIZE;

for (j = i; j < ses.listensize; j++) {
ses.listeners[j] = NULL;
}
}

for (j = 0; j < nsocks; j++) {
ses.maxfd = MAX(ses.maxfd, socks[j]);
}

TRACE(("new listener num %d ", i))

newlisten = (struct Listener*)m_malloc(sizeof(struct Listener));
newlisten->index = i;
newlisten->type = type;
newlisten->typedata = typedata;
newlisten->nsocks = nsocks;
memcpy(newlisten->socks, socks, nsocks * sizeof(int));
newlisten->acceptor = acceptor;
newlisten->cleanup = cleanup;

ses.listeners[i] = newlisten;
return newlisten;
}

/* Return the first listener which matches the type-specific comparison
* function. Particularly needed for global requests, like tcp */
struct Listener * get_listener(int type, void* typedata,
int (*match)(void*, void*)) {

unsigned int i;
struct Listener* listener;

for (i = 0, listener = ses.listeners[i]; i < ses.listensize; i++) {
if (listener->type == type
&& match(typedata, listener->typedata)) {
return listener;
}
}

return NULL;
}

void remove_listener(struct Listener* listener) {

unsigned int j;

if (listener->cleanup) {
listener->cleanup(listener);
}

for (j = 0; j < listener->nsocks; j++) {
close(listener->socks[j]);
}
ses.listeners[listener->index] = NULL;
m_free(listener);

}
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