uint8_t *packet_to_bytes(packet_t *packet, size_t *length, options_t options)
{
buffer_t *buffer = buffer_create(BO_BIG_ENDIAN);
buffer_add_int16(buffer, packet->packet_id);
buffer_add_int8(buffer, packet->packet_type);
buffer_add_int16(buffer, packet->session_id);
switch(packet->packet_type)
{
case PACKET_TYPE_SYN:
buffer_add_int16(buffer, packet->body.syn.seq);
buffer_add_int16(buffer, packet->body.syn.options);
if(packet->body.syn.options & OPT_NAME)
{
buffer_add_ntstring(buffer, packet->body.syn.name);
}
if(packet->body.syn.options & OPT_DOWNLOAD)
{
buffer_add_ntstring(buffer, packet->body.syn.filename);
}
break;
case PACKET_TYPE_MSG:
if(options & OPT_CHUNKED_DOWNLOAD)
{
buffer_add_int32(buffer, packet->body.msg.options.chunked.chunk);
}
else
{
buffer_add_int16(buffer, packet->body.msg.options.normal.seq);
buffer_add_int16(buffer, packet->body.msg.options.normal.ack);
}
buffer_add_bytes(buffer, packet->body.msg.data, packet->body.msg.data_length);
break;
case PACKET_TYPE_FIN:
buffer_add_ntstring(buffer, packet->body.fin.reason);
break;
case PACKET_TYPE_PING:
buffer_add_ntstring(buffer, packet->body.ping.data);
break;
default:
LOG_FATAL("Error: Unknown message type: %u\n", packet->packet_type);
exit(1);
}
return buffer_create_string_and_destroy(buffer, length);
}
/* Needs to be freed with safe_free() */
uint8_t *command_packet_to_bytes(command_packet_t *packet, size_t *length)
{
buffer_t *buffer = buffer_create(BO_BIG_ENDIAN);
buffer_t *buffer_with_size = buffer_create(BO_BIG_ENDIAN);
uint16_t packed_id;
packed_id = (packet->is_request ? 0x0000 : 0x8000);
packed_id |= (packet->request_id & 0x7FFF);
buffer_add_int16(buffer, packed_id);
buffer_add_int16(buffer, packet->command_id);
switch(packet->command_id)
{
case COMMAND_PING:
if(packet->is_request)
buffer_add_ntstring(buffer, packet->r.request.body.ping.data);
else
buffer_add_ntstring(buffer, packet->r.response.body.ping.data);
break;
case COMMAND_SHELL:
if(packet->is_request)
buffer_add_ntstring(buffer, packet->r.request.body.shell.name);
else
buffer_add_int16(buffer, packet->r.response.body.shell.session_id);
break;
case COMMAND_EXEC:
if(packet->is_request)
{
buffer_add_ntstring(buffer, packet->r.request.body.exec.name);
buffer_add_ntstring(buffer, packet->r.request.body.exec.command);
}
else
{
buffer_add_int16(buffer, packet->r.response.body.exec.session_id);
}
break;
case COMMAND_DOWNLOAD:
if(packet->is_request)
{
buffer_add_ntstring(buffer, packet->r.request.body.download.filename);
}
else
{
buffer_add_bytes(buffer, packet->r.response.body.download.data, packet->r.response.body.download.length);
}
break;
case COMMAND_UPLOAD:
if(packet->is_request)
{
buffer_add_ntstring(buffer, packet->r.request.body.upload.filename);
buffer_add_bytes(buffer, packet->r.request.body.upload.data, packet->r.request.body.upload.length);
}
else
{
}
break;
case COMMAND_SHUTDOWN:
break;
case TUNNEL_CONNECT:
if(packet->is_request)
{
buffer_add_int32(buffer, packet->r.request.body.tunnel_connect.options);
buffer_add_ntstring(buffer, packet->r.request.body.tunnel_connect.host);
buffer_add_int16(buffer, packet->r.request.body.tunnel_connect.port);
}
else
{
buffer_add_int32(buffer, packet->r.response.body.tunnel_connect.tunnel_id);
}
break;
case TUNNEL_DATA:
if(packet->is_request)
{
buffer_add_int32(buffer, packet->r.request.body.tunnel_data.tunnel_id);
buffer_add_bytes(buffer, packet->r.request.body.tunnel_data.data, packet->r.request.body.tunnel_data.length);
}
else
{
}
break;
case TUNNEL_CLOSE:
if(packet->is_request)
{
buffer_add_int32(buffer, packet->r.request.body.tunnel_close.tunnel_id);
buffer_add_ntstring(buffer, packet->r.request.body.tunnel_close.reason);
}
else
{
}
break;
case COMMAND_ERROR:
if(packet->is_request)
{
buffer_add_int16(buffer, packet->r.request.body.error.status);
buffer_add_ntstring(buffer, packet->r.request.body.error.reason);
}
else
{
buffer_add_int16(buffer, packet->r.response.body.error.status);
buffer_add_ntstring(buffer, packet->r.response.body.error.reason);
}
break;
default:
LOG_FATAL("Unknown command_id: 0x%04x", packet->command_id);
exit(1);
}
buffer_add_int32(buffer_with_size, buffer_get_length(buffer));
buffer_add_buffer(buffer_with_size, buffer);
buffer_destroy(buffer);
return buffer_create_string_and_destroy(buffer_with_size, length);
}
