stumpless-sys 0.3.0

// SPDX-License-Identifier: Apache-2.0

/*
 * Copyright 2019-2024 Joel E. Anderson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "private/config/have_sys_socket.h"

#include <errno.h>
#include <stddef.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "private/config.h"
#include "private/config/wrapper/locale.h"
#include "private/config/wrapper/int_connect.h"
#include "private/config/wrapper/thread_safety.h"
#include "private/error.h"
#include "private/target/network.h"

void
sys_socket_close_network_target( const struct network_target *target ) {
  if( target->handle != -1 ) {
    close( target->handle );
  }

  config_destroy_mutex( &target->mutex );
}

void
sys_socket_init_network_target( struct network_target *target ) {
  target->handle = -1;
  config_init_mutex( &target->mutex );
}

struct network_target *
sys_socket_open_tcp4_target( struct network_target *target ) {
  int result;

  lock_network_target( target );
  result = config_int_connect( target->destination,
                               target->port,
                               AF_INET,
                               SOCK_STREAM,
                               0 );
  target->handle = result;
  unlock_network_target( target );

  return result == -1 ? NULL : target;
}

struct network_target *
sys_socket_open_tcp6_target( struct network_target *target ) {
  int result;

  lock_network_target( target );
  result = config_int_connect( target->destination,
                               target->port,
                               AF_INET6,
                               SOCK_STREAM,
                               0 );
  target->handle = result;
  unlock_network_target( target );

  return result == -1 ? NULL : target;
}

struct network_target *
sys_socket_open_udp4_target( struct network_target *target ) {
  int result;

  lock_network_target( target );
  result = config_int_connect( target->destination,
                               target->port,
                               AF_INET,
                               SOCK_DGRAM,
                               0 );
  target->handle = result;
  unlock_network_target( target );

  return result == -1 ? NULL : target;
}

struct network_target *
sys_socket_open_udp6_target( struct network_target *target ) {
  int result;

  lock_network_target( target );
  result = config_int_connect( target->destination,
                               target->port,
                               AF_INET6,
                               SOCK_DGRAM,
                               0 );
  target->handle = result;
  unlock_network_target( target );

  return result == -1 ? NULL : target;
}

struct network_target *
sys_socket_reopen_tcp4_target( struct network_target *target ) {
  lock_network_target( target );

  if( sys_socket_network_target_is_open( target ) ) {
    close( target->handle );
    target->handle = config_int_connect( target->destination,
                                         target->port,
                                         AF_INET,
                                         SOCK_STREAM,
                                         0 );
  }

  unlock_network_target( target );
  return target;
}

struct network_target *
sys_socket_reopen_tcp6_target( struct network_target *target ) {
  lock_network_target( target );

  if( sys_socket_network_target_is_open( target ) ) {
    close( target->handle );
    target->handle = config_int_connect( target->destination,
                                         target->port,
                                         AF_INET6,
                                         SOCK_STREAM,
                                         0 );
  }

  unlock_network_target( target );
  return target;
}

struct network_target *
sys_socket_reopen_udp4_target( struct network_target *target ) {
  lock_network_target( target );

  if( sys_socket_network_target_is_open( target ) ) {
    close( target->handle );
    target->handle = config_int_connect( target->destination,
                                         target->port,
                                         AF_INET,
                                         SOCK_DGRAM,
                                         0 );
  }

  unlock_network_target( target );
  return target;
}

struct network_target *
sys_socket_reopen_udp6_target( struct network_target *target ) {
  lock_network_target( target );

  if( sys_socket_network_target_is_open( target ) ) {
    close( target->handle );
    target->handle = config_int_connect( target->destination,
                                         target->port,
                                         AF_INET6,
                                         SOCK_DGRAM,
                                         0 );
  }

  unlock_network_target( target );
  return target;
}

int
sys_socket_sendto_tcp_target( struct network_target *target,
                              const char *msg,
                              size_t msg_size ) {
  ssize_t recv_result;
  char recv_buffer[1];
  ssize_t send_result;
  size_t sent_bytes = 0;
  int result = 1;

  lock_network_target( target );

  // loop in case our send is interrupted
  while( sent_bytes < msg_size ) {
    // check to see if the remote end has sent a FIN
    recv_result = recv( target->handle, recv_buffer, 1, MSG_DONTWAIT );
    if( recv_result == 0 ){
      raise_network_closed( L10N_NETWORK_CLOSED_ERROR_MESSAGE );
      close( target->handle );
      target->handle = -1;
      result = -1;
      break;
    }

    send_result = send( target->handle,
                        msg,
                        msg_size - sent_bytes,
                        MSG_NOSIGNAL );

    if( unlikely( send_result == -1 ) ){
      raise_socket_send_failure( L10N_SEND_SYS_SOCKET_FAILED_ERROR_MESSAGE,
                                 errno,
                                 L10N_ERRNO_ERROR_CODE_TYPE );
      result = -1;
      break;
    }

    sent_bytes += send_result;
  }

  unlock_network_target( target );
  return result;
}

int
sys_socket_sendto_udp_target( const struct network_target *target,
                              const char *msg,
                              size_t msg_size ) {
  ssize_t send_result;

  lock_network_target( target );
  send_result = send( target->handle,
                      msg,
                      msg_size,
                      MSG_NOSIGNAL );

  if( unlikely( send_result == -1 ) ){
    unlock_network_target( target );
    raise_socket_send_failure( L10N_SEND_SYS_SOCKET_FAILED_ERROR_MESSAGE,
                               errno,
                               L10N_ERRNO_ERROR_CODE_TYPE );
    return -1;
  }

  unlock_network_target( target );

  return 1;
}

int
sys_socket_network_target_is_open( const struct network_target *target ) {
  return target->handle != -1;
}