/**
* @brief Add a fd to the event and assign it a callback,
* when used in blocking mode.
* @param event The ssh_event
* @param fd Socket that will be polled.
* @param events Poll events that will be monitored for the socket. i.e.
* POLLIN, POLLPRI, POLLOUT
* @param cb Function to be called if any of the events are set.
* The prototype of cb is:
* int (*ssh_event_callback)(socket_t fd, int revents,
* void *userdata);
* @param userdata Userdata to be passed to the callback function. NULL if
* not needed.
*
* @returns SSH_OK on success
* SSH_ERROR on failure
*/
int ssh_event_add_fd(ssh_event event, socket_t fd, short events,
ssh_event_callback cb, void *userdata) {
ssh_poll_handle p;
struct ssh_event_fd_wrapper *pw;
if(event == NULL || event->ctx == NULL || cb == NULL
|| fd == SSH_INVALID_SOCKET) {
return SSH_ERROR;
}
pw = malloc(sizeof(struct ssh_event_fd_wrapper));
if(pw == NULL) {
return SSH_ERROR;
}
pw->cb = cb;
pw->userdata = userdata;
/* pw is freed by ssh_event_remove_fd */
p = ssh_poll_new(fd, events, ssh_event_fd_wrapper_callback, pw);
if(p == NULL) {
free(pw);
return SSH_ERROR;
}
if(ssh_poll_ctx_add(event->ctx, p) < 0) {
free(pw);
ssh_poll_free(p);
return SSH_ERROR;
}
return SSH_OK;
}
/** @internal
* @brief returns the current poll handle, or create it
* @param sshbind the ssh_bind object
* @returns a ssh_poll handle suitable for operation
*/
ssh_poll_handle ssh_bind_get_poll(ssh_bind sshbind){
if(sshbind->poll)
return sshbind->poll;
sshbind->poll=ssh_poll_new(sshbind->bindfd,POLLIN,
ssh_bind_poll_callback,sshbind);
return sshbind->poll;
}
/**
* @brief SSH poll callback. This callback will be used when an event
* caught on the socket.
*
* @param p Poll object this callback belongs to.
* @param fd The raw socket.
* @param revents The current poll events on the socket.
* @param userdata Userdata to be passed to the callback function,
* in this case the socket object.
*
* @return 0 on success, < 0 when the poll object has been removed
* from its poll context.
*/
int ssh_socket_pollcallback(struct ssh_poll_handle_struct *p, socket_t fd,
int revents, void *v_s) {
ssh_socket s = (ssh_socket)v_s;
char buffer[MAX_BUF_SIZE];
int r;
int err = 0;
socklen_t errlen = sizeof(err);
/* Do not do anything if this socket was already closed */
if (!ssh_socket_is_open(s)) {
return -1;
}
SSH_LOG(SSH_LOG_TRACE, "Poll callback on socket %d (%s%s%s), out buffer %d",fd,
(revents & POLLIN) ? "POLLIN ":"",
(revents & POLLOUT) ? "POLLOUT ":"",
(revents & POLLERR) ? "POLLERR":"",
ssh_buffer_get_len(s->out_buffer));
if (revents & POLLERR || revents & POLLHUP) {
/* Check if we are in a connecting state */
if (s->state == SSH_SOCKET_CONNECTING) {
s->state = SSH_SOCKET_ERROR;
r = getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *)&err, &errlen);
if (r < 0) {
err = errno;
}
s->last_errno = err;
ssh_socket_close(s);
if (s->callbacks && s->callbacks->connected) {
s->callbacks->connected(SSH_SOCKET_CONNECTED_ERROR, err,
s->callbacks->userdata);
}
return -1;
}
/* Then we are in a more standard kind of error */
/* force a read to get an explanation */
revents |= POLLIN;
}
if ((revents & POLLIN) && s->state == SSH_SOCKET_CONNECTED) {
s->read_wontblock = 1;
r = ssh_socket_unbuffered_read(s, buffer, sizeof(buffer));
if (r < 0) {
if (p != NULL) {
ssh_poll_remove_events(p, POLLIN);
}
if (s->callbacks && s->callbacks->exception) {
s->callbacks->exception(SSH_SOCKET_EXCEPTION_ERROR,
s->last_errno, s->callbacks->userdata);
/* p may have been freed, so don't use it
* anymore in this function */
p = NULL;
return -2;
}
}
if (r == 0) {
if (p != NULL) {
ssh_poll_remove_events(p, POLLIN);
}
if (p != NULL) {
ssh_poll_remove_events(p, POLLIN);
}
if (s->callbacks && s->callbacks->exception) {
s->callbacks->exception(SSH_SOCKET_EXCEPTION_EOF,
0, s->callbacks->userdata);
/* p may have been freed, so don't use it
* anymore in this function */
p = NULL;
return -2;
}
}
if (r > 0) {
if (s->session->socket_counter != NULL) {
s->session->socket_counter->in_bytes += r;
}
/* Bufferize the data and then call the callback */
r = ssh_buffer_add_data(s->in_buffer, buffer, r);
if (r < 0) {
return -1;
}
if (s->callbacks && s->callbacks->data) {
do {
r = s->callbacks->data(ssh_buffer_get(s->in_buffer),
ssh_buffer_get_len(s->in_buffer),
s->callbacks->userdata);
ssh_buffer_pass_bytes(s->in_buffer, r);
} while ((r > 0) && (s->state == SSH_SOCKET_CONNECTED));
/* p may have been freed, so don't use it
* anymore in this function */
p = NULL;
}
}
}
#ifdef _WIN32
if (revents & POLLOUT || revents & POLLWRNORM) {
#else
if (revents & POLLOUT) {
#endif
/* First, POLLOUT is a sign we may be connected */
if (s->state == SSH_SOCKET_CONNECTING) {
SSH_LOG(SSH_LOG_PACKET, "Received POLLOUT in connecting state");
s->state = SSH_SOCKET_CONNECTED;
if (p != NULL) {
ssh_poll_set_events(p, POLLOUT | POLLIN);
}
r = ssh_socket_set_blocking(ssh_socket_get_fd_in(s));
if (r < 0) {
return -1;
}
if (s->callbacks && s->callbacks->connected) {
s->callbacks->connected(SSH_SOCKET_CONNECTED_OK, 0,
s->callbacks->userdata);
}
return 0;
}
/* So, we can write data */
s->write_wontblock=1;
if (p != NULL) {
ssh_poll_remove_events(p, POLLOUT);
}
/* If buffered data is pending, write it */
if (ssh_buffer_get_len(s->out_buffer) > 0) {
ssh_socket_nonblocking_flush(s);
} else if (s->callbacks && s->callbacks->controlflow) {
/* Otherwise advertise the upper level that write can be done */
SSH_LOG(SSH_LOG_TRACE,"sending control flow event");
s->callbacks->controlflow(SSH_SOCKET_FLOW_WRITEWONTBLOCK,
s->callbacks->userdata);
}
/* TODO: Find a way to put back POLLOUT when buffering occurs */
}
/* Return -1 if one of the poll handlers disappeared */
return (s->poll_in == NULL || s->poll_out == NULL) ? -1 : 0;
}
/** @internal
* @brief returns the input poll handle corresponding to the socket,
* creates it if it does not exist.
* @returns allocated and initialized ssh_poll_handle object
*/
ssh_poll_handle ssh_socket_get_poll_handle_in(ssh_socket s){
if(s->poll_in)
return s->poll_in;
s->poll_in=ssh_poll_new(s->fd_in,0,ssh_socket_pollcallback,s);
if(s->fd_in == s->fd_out && s->poll_out == NULL)
s->poll_out=s->poll_in;
return s->poll_in;
}
/** @internal
* @brief returns the output poll handle corresponding to the socket,
* creates it if it does not exist.
* @returns allocated and initialized ssh_poll_handle object
*/
ssh_poll_handle ssh_socket_get_poll_handle_out(ssh_socket s){
if(s->poll_out)
return s->poll_out;
s->poll_out=ssh_poll_new(s->fd_out,0,ssh_socket_pollcallback,s);
if(s->fd_in == s->fd_out && s->poll_in == NULL)
s->poll_in=s->poll_out;
return s->poll_out;
}
/** \internal
* \brief Deletes a socket object
*/
void ssh_socket_free(ssh_socket s){
if (s == NULL) {
return;
}
ssh_socket_close(s);
ssh_buffer_free(s->in_buffer);
ssh_buffer_free(s->out_buffer);
SAFE_FREE(s);
}
#ifndef _WIN32
int ssh_socket_unix(ssh_socket s, const char *path) {
struct sockaddr_un sunaddr;
socket_t fd;
sunaddr.sun_family = AF_UNIX;
snprintf(sunaddr.sun_path, sizeof(sunaddr.sun_path), "%s", path);
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == SSH_INVALID_SOCKET) {
ssh_set_error(s->session, SSH_FATAL,
"Error from socket(AF_UNIX, SOCK_STREAM, 0): %s",
strerror(errno));
return -1;
}
if (fcntl(fd, F_SETFD, 1) == -1) {
ssh_set_error(s->session, SSH_FATAL,
"Error from fcntl(fd, F_SETFD, 1): %s",
strerror(errno));
close(fd);
return -1;
}
if (connect(fd, (struct sockaddr *) &sunaddr,
sizeof(sunaddr)) < 0) {
ssh_set_error(s->session, SSH_FATAL, "Error from connect(): %s",
strerror(errno));
close(fd);
return -1;
}
ssh_socket_set_fd(s,fd);
return 0;
}
#endif
/** \internal
* \brief closes a socket
*/
void ssh_socket_close(ssh_socket s){
if (ssh_socket_is_open(s)) {
#ifdef _WIN32
CLOSE_SOCKET(s->fd_in);
/* fd_in = fd_out under win32 */
s->last_errno = WSAGetLastError();
#else
if (s->fd_out != s->fd_in && s->fd_out != -1) {
CLOSE_SOCKET(s->fd_out);
}
CLOSE_SOCKET(s->fd_in);
s->last_errno = errno;
#endif
}
if(s->poll_in != NULL){
if(s->poll_out == s->poll_in)
s->poll_out = NULL;
ssh_poll_free(s->poll_in);
s->poll_in=NULL;
}
if(s->poll_out != NULL){
ssh_poll_free(s->poll_out);
s->poll_out=NULL;
}
s->state = SSH_SOCKET_CLOSED;
}
/**
* @internal
* @brief sets the file descriptor of the socket.
* @param[out] s ssh_socket to update
* @param[in] fd file descriptor to set
* @warning this function updates boths the input and output
* file descriptors
*/
void ssh_socket_set_fd(ssh_socket s, socket_t fd) {
s->fd_in = s->fd_out = fd;
if (s->poll_in) {
ssh_poll_set_fd(s->poll_in,fd);
} else {
s->state = SSH_SOCKET_CONNECTING;
/* POLLOUT is the event to wait for in a nonblocking connect */
ssh_poll_set_events(ssh_socket_get_poll_handle_in(s), POLLOUT);
#ifdef _WIN32
ssh_poll_add_events(ssh_socket_get_poll_handle_in(s), POLLWRNORM);
#endif
}
}