i++;
}
assert(&e->node == list);
assert(i == n);
i = 0;
LIST_FOR_EACH_REVERSE (e, node, list) {
assert(i < n);
assert(e->value == values[n - i - 1]);
i++;
}
assert(&e->node == list);
assert(i == n);
assert(list_is_empty(list) == !n);
assert(list_is_singleton(list) == (n == 1));
assert(list_is_short(list) == (n < 2));
assert(list_size(list) == n);
}
#if 0
/* Prints the values in 'list', plus 'name' as a title. */
static void
print_list(const char *name, struct list *list)
{
struct element *e;
printf("%s:", name);
LIST_FOR_EACH (e, node, list) {
printf(" %d", e->value);
}
/* Based on network/socket.c:get_pasv_socket() but modified to try and bind to a
* port range instead of any port. */
struct connection_state
init_bittorrent_listening_socket(struct connection *conn)
{
struct bittorrent_connection *bittorrent = conn->info;
struct sockaddr_in addr, addr2;
uint16_t port, max_port;
int len;
/* XXX: Always add the connection to the list even if we fail so we can
* safely assume it is in done_bittorrent_listening_socket(). */
add_to_list(bittorrent_connections, bittorrent);
/* Has the socket already been initialized? */
if (!list_is_singleton(bittorrent_connections))
return connection_state(S_OK);
/* We could have bailed out from an earlier attempt. */
if (bittorrent_socket != -1)
close(bittorrent_socket);
bittorrent_socket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (bittorrent_socket < 0)
return connection_state_for_errno(errno);
/* Set it non-blocking */
if (set_nonblocking_fd(bittorrent_socket) < 0)
return connection_state_for_errno(errno);
/* Bind it to some port */
port = get_opt_int("protocol.bittorrent.ports.min", NULL);
max_port = get_opt_int("protocol.bittorrent.ports.max", NULL);
memset(&addr, 0, sizeof(addr));
addr.sin_port = htons(port);
/* Repeatedly try the configured port range. */
while (bind(bittorrent_socket, (struct sockaddr *) &addr, sizeof(addr))) {
if (errno != EADDRINUSE)
return connection_state_for_errno(errno);
/* If all ports was in use fail with EADDRINUSE. */
if (++port > max_port)
return connection_state_for_errno(errno);
memset(&addr, 0, sizeof(addr));
addr.sin_port = htons(port);
}
/* Get the endpoint info about the new socket and save it */
memset(&addr2, 0, sizeof(addr2));
len = sizeof(addr2);
if (getsockname(bittorrent_socket, (struct sockaddr *) &addr2, &len))
return connection_state_for_errno(errno);
bittorrent->port = ntohs(addr2.sin_port);
/* Go listen */
if (listen(bittorrent_socket, LISTEN_BACKLOG))
return connection_state_for_errno(errno);
set_ip_tos_throughput(bittorrent_socket);
set_handlers(bittorrent_socket, accept_bittorrent_peer_connection,
NULL, NULL, NULL);
return connection_state(S_OK);
}
