static int signal_pipe_dispatch(void) {
int sig, err;
s_log(LOG_DEBUG, "Dispatching signals from the signal pipe");
while(readsocket(signal_pipe[0], (char *)&sig, sizeof sig)==sizeof sig) {
switch(sig) {
#ifndef USE_WIN32
case SIGCHLD:
s_log(LOG_DEBUG, "Processing SIGCHLD");
#ifdef USE_FORK
client_status(); /* report status of client process */
#else /* USE_UCONTEXT || USE_PTHREAD */
child_status(); /* report status of libwrap or 'exec' process */
#endif /* defined USE_FORK */
break;
#endif /* !defind USE_WIN32 */
case SIGNAL_RELOAD_CONFIG:
s_log(LOG_DEBUG, "Processing SIGNAL_RELOAD_CONFIG");
err=parse_conf(NULL, CONF_RELOAD);
if(err) {
s_log(LOG_ERR, "Failed to reload the configuration file");
} else {
unbind_ports();
log_close();
apply_conf();
log_open();
if(bind_ports()) {
/* FIXME: handle the error */
}
}
break;
case SIGNAL_REOPEN_LOG:
s_log(LOG_DEBUG, "Processing SIGNAL_REOPEN_LOG");
log_close();
log_open();
s_log(LOG_NOTICE, "Log file reopened");
break;
case SIGNAL_TERMINATE:
s_log(LOG_DEBUG, "Processing SIGNAL_TERMINATE");
s_log(LOG_NOTICE, "Terminated");
return 2;
default:
s_log(LOG_ERR, "Received signal %d; terminating", sig);
return 1;
}
}
s_log(LOG_DEBUG, "Signal pipe is empty");
return 0;
}
void client_stop (client_t *c)
{
int i;
if (c->sock == MAX_SOCK_NUM)
return;
// attempt to close the connection gracefully (send a FIN to other side)
socket_disconnect (c->sock);
// wait a second for the connection to close
for (i=0; i<100; i++) {
if (client_status (c) == SnSR_CLOSED)
break;
usleep (10000);
}
// if it hasn't closed, close it forcefully
if (client_status(c) != SnSR_CLOSED)
socket_close (c->sock);
_socket_port[c->sock] = 0;
c->sock = MAX_SOCK_NUM;
}
void server_accept()
{
unsigned sock;
client_t client;
int listening = 0;
for (sock = 0; sock < MAX_SOCK_NUM; sock++) {
client_init_sock (&client, sock);
if (_socket_port[sock] == _server_port) {
if (client_status (&client) == SnSR_LISTEN) {
listening = 1;
}
else if (client_status (&client) == SnSR_CLOSE_WAIT &&
! client_available (&client)) {
client_stop (&client);
}
}
}
if (! listening) {
server_init (_server_port);
}
}
void server_write (const uint8_t *buffer, size_t size)
{
unsigned sock;
client_t client;
server_accept();
for (sock = 0; sock < MAX_SOCK_NUM; sock++) {
client_init_sock (&client, sock);
if (_socket_port[sock] == _server_port &&
client_status (&client) == SnSR_ESTABLISHED) {
client_write (&client, buffer, size);
}
}
}
void server_init (unsigned port)
{
unsigned sock;
client_t client;
_server_port = port;
for (sock = 0; sock < MAX_SOCK_NUM; sock++) {
client_init_sock (&client, sock);
if (client_status (&client) == SnSR_CLOSED) {
socket_init (sock, SnMR_TCP, port, 0);
socket_listen (sock);
_socket_port[sock] = port;
break;
}
}
}
/**
* @brief Read data from a network connection, and store the data in the connection context buffer.
* @return -1 on general failure, -2 if the connection was reset, or the amount of data that was read.
*/
int64_t client_read(client_t *client) {
int_t counter = 0;
ssize_t bytes = 0;
bool_t blocking = true;
stringer_t *error = NULL;
#ifdef MAGMA_PEDANTIC
int_t local = 0;
stringer_t *ip = NULL, *cipher = NULL;
#endif
if (!client || client->sockd == -1 || client_status(client) < 0) {
return -1;
}
// Check for data past the current line buffer.
else if (pl_length_get(client->line) && st_length_get(client->buffer) > pl_length_get(client->line)) {
// Move the unused data to the front of the buffer.
mm_move(st_data_get(client->buffer), st_data_get(client->buffer) + pl_length_get(client->line), st_length_get(client->buffer) - pl_length_get(client->line));
// Update the length.
st_length_set(client->buffer, st_length_get(client->buffer) - pl_length_get(client->line));
// Clear the line buffer.
client->line = pl_null();
}
// Otherwise reset the buffer and line lengths to zero.
else {
st_length_set(client->buffer, 0);
client->line = pl_null();
}
// Loop until the buffer has data or we get an error.
do {
blocking = st_length_get(client->buffer) ? false : true;
// Read bytes off the network. If data is already in the buffer this should be a non-blocking read operation so we can
// return the already buffered data without delay.
if (client->tls) {
// If bytes is zero or below and the library isn't asking for another read, then an error occurred.
bytes = tls_read(client->tls, st_char_get(client->buffer) + st_length_get(client->buffer),
st_avail_get(client->buffer) - st_length_get(client->buffer), blocking);
// If zero bytes were read, or a negative value was returned to indicate an error, call tls_erorr(), which will return
// NULL if the error can be safely ignored. Otherwise log the output for debug purposes.
if (bytes <= 0 && (error = tls_error(client->tls, bytes, MANAGEDBUF(512)))) {
#ifdef MAGMA_PEDANTIC
cipher = tls_cipher(client->tls, MANAGEDBUF(128));
ip = ip_presentation(client->ip, MANAGEDBUF(INET6_ADDRSTRLEN));
log_pedantic("TLS client read operation failed. { ip = %.*s / %.*s / result = %zi%s%.*s }",
st_length_int(ip), st_char_get(ip), st_length_int(cipher), st_char_get(cipher),
bytes, (error ? " / " : ""), st_length_int(error), st_char_get(error));
#endif
client->status = -1;
return -1;
}
// This will occur when the read operation results in a 0, or negative value, but TLS error returns NULL to
// indicate it was a transient error. For transient errors we simply set bytes equal to 0 so the read call gets retried.
else if (bytes <= 0) {
bytes = 0;
}
}
else {
errno = 0;
bytes = recv(client->sockd, st_char_get(client->buffer) + st_length_get(client->buffer),
st_avail_get(client->buffer) - st_length_get(client->buffer), (blocking ? 0 : MSG_DONTWAIT));
// Check for errors on non-SSL reads in the traditional way.
if (bytes <= 0 && tcp_status(client->sockd)) {
#ifdef MAGMA_PEDANTIC
local = errno;
ip = ip_presentation(client->ip, MANAGEDBUF(INET6_ADDRSTRLEN));
log_pedantic("TCP client read operation failed. { ip = %.*s / result = %zi / error = %i / message = %s }",
st_length_int(ip), st_char_get(ip), bytes, local, strerror_r(local, MEMORYBUF(1024), 1024));
#endif
client->status = -1;
return -1;
}
}
// We actually read in data, so we need to update the buffer to reflect the amount of data it currently holds.
if (bytes > 0) {
st_length_set(client->buffer, st_length_get(client->buffer) + bytes);
}
} while (blocking && counter++ < 128 && !st_length_get(client->buffer) && status());
// If there is data in the buffer process it. Otherwise if the buffer is empty and the connection appears to be closed
// (as indicated by a return value of 0), then return -1 to let the caller know the connection is dead.
if (st_length_get(client->buffer)) {
client->status = 1;
}
else if (!bytes) {
client->status = 2;
return -2;
}
return st_length_get(client->buffer);
}
NOEXPORT int signal_pipe_dispatch(void) {
static int sig;
static size_t ptr=0;
ssize_t num;
char *sig_name;
s_log(LOG_DEBUG, "Dispatching signals from the signal pipe");
for(;;) {
num=readsocket(signal_pipe[0], (char *)&sig+ptr, sizeof sig-ptr);
if(num==-1 && get_last_socket_error()==S_EWOULDBLOCK) {
s_log(LOG_DEBUG, "Signal pipe is empty");
return 0;
}
if(num==-1 || num==0) {
if(num)
sockerror("signal pipe read");
else
s_log(LOG_ERR, "Signal pipe closed");
s_poll_remove(fds, signal_pipe[0]);
closesocket(signal_pipe[0]);
closesocket(signal_pipe[1]);
if(signal_pipe_init()) {
s_log(LOG_ERR,
"Signal pipe reinitialization failed; terminating");
return 1;
}
s_poll_add(fds, signal_pipe[0], 1, 0);
s_log(LOG_ERR, "Signal pipe reinitialized");
return 0;
}
ptr+=(size_t)num;
if(ptr<sizeof sig) {
s_log(LOG_DEBUG, "Incomplete signal pipe read (ptr=%ld)",
(long)ptr);
return 0;
}
ptr=0;
switch(sig) {
#ifndef USE_WIN32
case SIGCHLD:
s_log(LOG_DEBUG, "Processing SIGCHLD");
#ifdef USE_FORK
client_status(); /* report status of client process */
#else /* USE_UCONTEXT || USE_PTHREAD */
child_status(); /* report status of libwrap or 'exec' process */
#endif /* defined USE_FORK */
break;
#endif /* !defind USE_WIN32 */
case SIGNAL_RELOAD_CONFIG:
s_log(LOG_DEBUG, "Processing SIGNAL_RELOAD_CONFIG");
if(options_parse(CONF_RELOAD)) {
s_log(LOG_ERR, "Failed to reload the configuration file");
} else {
unbind_ports();
log_close();
options_apply();
log_open();
ui_config_reloaded();
if(bind_ports()) {
/* FIXME: handle the error */
}
}
break;
case SIGNAL_REOPEN_LOG:
s_log(LOG_DEBUG, "Processing SIGNAL_REOPEN_LOG");
log_close();
log_open();
s_log(LOG_NOTICE, "Log file reopened");
break;
case SIGNAL_TERMINATE:
s_log(LOG_DEBUG, "Processing SIGNAL_TERMINATE");
s_log(LOG_NOTICE, "Terminated");
return 1;
default:
sig_name=signal_name(sig);
s_log(LOG_ERR, "Received %s; terminating", sig_name);
str_free(sig_name);
return 1;
}
}
}