static void
control_connection_io_output(gpointer s)
{
ControlConnection *self = (ControlConnection *) s;
gint rc;
rc = write(self->control_io.fd, self->output_buffer->str + self->pos, self->output_buffer->len - self->pos);
if (rc < 0)
{
if (errno != EAGAIN)
{
msg_error("Error writing control channel",
evt_tag_errno("error", errno),
NULL);
control_connection_stop_watches(self);
control_connection_free(self);
return;
}
}
else
{
self->pos += rc;
}
control_connection_update_watches(self);
}
void
control_server_connection_closed(ControlServer *self, ControlConnection *cc)
{
control_connection_stop_watches(cc);
control_connection_free(cc);
}
/*
* NOTE: the channel is not in nonblocking mode, thus the control channel
* may block syslog-ng completely.
*/
static void
control_connection_io_input(void *s)
{
ControlConnection *self = (ControlConnection *) s;
GString *command = NULL;
gchar *nl;
gint rc;
gint cmd;
gint orig_len;
if (self->input_buffer->len > MAX_CONTROL_LINE_LENGTH)
{
/* too much data in input, drop the connection */
msg_error("Too much data in the control socket input buffer",
NULL);
control_connection_stop_watches(self);
control_connection_free(self);
return;
}
orig_len = self->input_buffer->len;
/* NOTE: plus one for the terminating NUL */
g_string_set_size(self->input_buffer, self->input_buffer->len + 128 + 1);
rc = read(self->control_io.fd, self->input_buffer->str + orig_len, 128);
if (rc < 0)
{
if (errno != EAGAIN)
{
msg_error("Error reading command on control channel, closing control channel",
evt_tag_errno("error", errno),
NULL);
goto destroy_connection;
}
/* EAGAIN, should try again when data comes */
control_connection_update_watches(self);
return;
}
else if (rc == 0)
{
msg_error("EOF on control channel, closing connection",
NULL);
goto destroy_connection;
}
else
{
self->input_buffer->len = orig_len + rc;
self->input_buffer->str[self->input_buffer->len] = 0;
}
/* here we have finished reading the input, check if there's a newline somewhere */
nl = strchr(self->input_buffer->str, '\n');
if (nl)
{
command = g_string_sized_new(128);
/* command doesn't contain NL */
g_string_assign_len(command, self->input_buffer->str, nl - self->input_buffer->str);
/* strip NL */
g_string_erase(self->input_buffer, 0, command->len + 1);
}
else
{
/* no EOL in the input buffer, wait for more data */
control_connection_update_watches(self);
return;
}
for (cmd = 0; commands[cmd].func; cmd++)
{
if (strncmp(commands[cmd].command, command->str, strlen(commands[cmd].command)) == 0)
{
commands[cmd].func(self, command);
break;
}
}
if (!commands[cmd].func)
{
msg_error("Unknown command read on control channel, closing control channel",
evt_tag_str("command", command->str), NULL);
goto destroy_connection;
}
control_connection_update_watches(self);
g_string_free(command, TRUE);
return;
destroy_connection:
control_connection_stop_watches(self);
control_connection_free(self);
}