Browse Source
Removed nuttx and posix specific files for mavlink_ftp and mavlink_receiver. Signed-off-by: Mark Charlebois <charlebm@gmail.com>sbg
6 changed files with 19 additions and 2458 deletions
@ -1,853 +0,0 @@
@@ -1,853 +0,0 @@
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/****************************************************************************
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* |
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* Copyright (c) 2014 PX4 Development Team. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name PX4 nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/// @file mavlink_ftp.cpp
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/// @author px4dev, Don Gagne <don@thegagnes.com>
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#include <crc32.h> |
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#include <unistd.h> |
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#include <stdio.h> |
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#include <fcntl.h> |
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#include <sys/stat.h> |
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#include <errno.h> |
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#include "mavlink_ftp.h" |
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#include "mavlink_tests/mavlink_ftp_test.h" |
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// Uncomment the line below to get better debug output. Never commit with this left on.
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//#define MAVLINK_FTP_DEBUG
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MavlinkFTP * |
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MavlinkFTP::get_server(void) |
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{ |
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static MavlinkFTP server; |
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return &server; |
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} |
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MavlinkFTP::MavlinkFTP() : |
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_request_bufs{}, |
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_request_queue{}, |
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_request_queue_sem{}, |
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_utRcvMsgFunc{}, |
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_ftp_test{} |
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{ |
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// initialise the request freelist
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dq_init(&_request_queue); |
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sem_init(&_request_queue_sem, 0, 1); |
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// initialize session list
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for (size_t i=0; i<kMaxSession; i++) { |
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_session_fds[i] = -1; |
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} |
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// drop work entries onto the free list
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for (unsigned i = 0; i < kRequestQueueSize; i++) { |
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_return_request(&_request_bufs[i]); |
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} |
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} |
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#ifdef MAVLINK_FTP_UNIT_TEST |
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void |
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MavlinkFTP::set_unittest_worker(ReceiveMessageFunc_t rcvMsgFunc, MavlinkFtpTest *ftp_test) |
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{ |
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_utRcvMsgFunc = rcvMsgFunc; |
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_ftp_test = ftp_test; |
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} |
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#endif |
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void |
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MavlinkFTP::handle_message(Mavlink* mavlink, mavlink_message_t *msg) |
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{ |
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// get a free request
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struct Request* req = _get_request(); |
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// if we couldn't get a request slot, just drop it
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if (req == nullptr) { |
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warnx("Dropping FTP request: queue full\n"); |
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return; |
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} |
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if (msg->msgid == MAVLINK_MSG_ID_FILE_TRANSFER_PROTOCOL) { |
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mavlink_msg_file_transfer_protocol_decode(msg, &req->message); |
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#ifdef MAVLINK_FTP_UNIT_TEST |
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if (!_utRcvMsgFunc) { |
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warnx("Incorrectly written unit test\n"); |
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return; |
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} |
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// We use fake ids when unit testing
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req->serverSystemId = MavlinkFtpTest::serverSystemId; |
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req->serverComponentId = MavlinkFtpTest::serverComponentId; |
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req->serverChannel = MavlinkFtpTest::serverChannel; |
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#else |
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// Not unit testing, use the real thing
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req->serverSystemId = mavlink->get_system_id(); |
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req->serverComponentId = mavlink->get_component_id(); |
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req->serverChannel = mavlink->get_channel(); |
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#endif |
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// This is the system id we want to target when sending
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req->targetSystemId = msg->sysid; |
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if (req->message.target_system == req->serverSystemId) { |
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req->mavlink = mavlink; |
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#ifdef MAVLINK_FTP_UNIT_TEST |
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// We are running in Unit Test mode. Don't queue, just call _worket directly.
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_process_request(req); |
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#else |
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// We are running in normal mode. Queue the request to the worker
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work_queue(LPWORK, &req->work, &MavlinkFTP::_worker_trampoline, req, 0); |
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#endif |
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return; |
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} |
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} |
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_return_request(req); |
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} |
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/// @brief Queued static work queue routine to handle mavlink messages
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void |
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MavlinkFTP::_worker_trampoline(void *arg) |
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{ |
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Request* req = reinterpret_cast<Request *>(arg); |
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MavlinkFTP* server = MavlinkFTP::get_server(); |
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// call the server worker with the work item
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server->_process_request(req); |
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} |
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/// @brief Processes an FTP message
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void |
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MavlinkFTP::_process_request(Request *req) |
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{ |
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PayloadHeader *payload = reinterpret_cast<PayloadHeader *>(&req->message.payload[0]); |
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ErrorCode errorCode = kErrNone; |
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// basic sanity checks; must validate length before use
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if (payload->size > kMaxDataLength) { |
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errorCode = kErrInvalidDataSize; |
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goto out; |
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} |
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#ifdef MAVLINK_FTP_DEBUG |
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printf("ftp: channel %u opc %u size %u offset %u\n", req->serverChannel, payload->opcode, payload->size, payload->offset); |
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#endif |
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switch (payload->opcode) { |
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case kCmdNone: |
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break; |
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case kCmdTerminateSession: |
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errorCode = _workTerminate(payload); |
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break; |
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case kCmdResetSessions: |
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errorCode = _workReset(payload); |
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break; |
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case kCmdListDirectory: |
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errorCode = _workList(payload); |
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break; |
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case kCmdOpenFileRO: |
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errorCode = _workOpen(payload, O_RDONLY); |
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break; |
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case kCmdCreateFile: |
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errorCode = _workOpen(payload, O_CREAT | O_EXCL | O_WRONLY); |
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break; |
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case kCmdOpenFileWO: |
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errorCode = _workOpen(payload, O_CREAT | O_WRONLY); |
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break; |
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case kCmdReadFile: |
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errorCode = _workRead(payload); |
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break; |
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case kCmdWriteFile: |
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errorCode = _workWrite(payload); |
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break; |
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case kCmdRemoveFile: |
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errorCode = _workRemoveFile(payload); |
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break; |
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case kCmdRename: |
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errorCode = _workRename(payload); |
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break; |
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case kCmdTruncateFile: |
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errorCode = _workTruncateFile(payload); |
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break; |
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case kCmdCreateDirectory: |
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errorCode = _workCreateDirectory(payload); |
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break; |
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case kCmdRemoveDirectory: |
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errorCode = _workRemoveDirectory(payload); |
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break; |
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case kCmdCalcFileCRC32: |
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errorCode = _workCalcFileCRC32(payload); |
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break; |
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default: |
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errorCode = kErrUnknownCommand; |
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break;
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} |
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out: |
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// handle success vs. error
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if (errorCode == kErrNone) { |
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payload->req_opcode = payload->opcode; |
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payload->opcode = kRspAck; |
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#ifdef MAVLINK_FTP_DEBUG |
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warnx("FTP: ack\n"); |
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#endif |
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} else { |
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int r_errno = errno; |
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warnx("FTP: nak %u", errorCode); |
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payload->req_opcode = payload->opcode; |
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payload->opcode = kRspNak; |
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payload->size = 1; |
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payload->data[0] = errorCode; |
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if (errorCode == kErrFailErrno) { |
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payload->size = 2; |
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payload->data[1] = r_errno; |
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} |
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} |
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// respond to the request
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_reply(req); |
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_return_request(req); |
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} |
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/// @brief Sends the specified FTP reponse message out through mavlink
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void |
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MavlinkFTP::_reply(Request *req) |
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{ |
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PayloadHeader *payload = reinterpret_cast<PayloadHeader *>(&req->message.payload[0]); |
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payload->seqNumber = payload->seqNumber + 1; |
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mavlink_message_t msg; |
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msg.checksum = 0; |
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#ifndef MAVLINK_FTP_UNIT_TEST |
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uint16_t len = |
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#endif |
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mavlink_msg_file_transfer_protocol_pack_chan(req->serverSystemId, // Sender system id
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req->serverComponentId, // Sender component id
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req->serverChannel, // Channel to send on
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&msg, // Message to pack payload into
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0, // Target network
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req->targetSystemId, // Target system id
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0, // Target component id
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(const uint8_t*)payload); // Payload to pack into message
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bool success = true; |
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#ifdef MAVLINK_FTP_UNIT_TEST |
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// Unit test hook is set, call that instead
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_utRcvMsgFunc(&msg, _ftp_test); |
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#else |
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Mavlink *mavlink = req->mavlink; |
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mavlink->lockMessageBufferMutex(); |
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success = mavlink->message_buffer_write(&msg, len); |
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mavlink->unlockMessageBufferMutex(); |
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#endif |
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if (!success) { |
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warnx("FTP TX ERR"); |
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} |
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#ifdef MAVLINK_FTP_DEBUG |
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else { |
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warnx("wrote: sys: %d, comp: %d, chan: %d, checksum: %d", |
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req->serverSystemId, |
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req->serverComponentId, |
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req->serverChannel, |
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msg.checksum); |
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} |
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#endif |
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} |
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/// @brief Responds to a List command
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MavlinkFTP::ErrorCode |
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MavlinkFTP::_workList(PayloadHeader* payload) |
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{ |
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char dirPath[kMaxDataLength]; |
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strncpy(dirPath, _data_as_cstring(payload), kMaxDataLength); |
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DIR *dp = opendir(dirPath); |
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if (dp == nullptr) { |
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warnx("FTP: can't open path '%s'", dirPath); |
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return kErrFailErrno; |
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} |
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#ifdef MAVLINK_FTP_DEBUG |
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warnx("FTP: list %s offset %d", dirPath, payload->offset); |
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#endif |
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ErrorCode errorCode = kErrNone; |
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struct dirent entry, *result = nullptr; |
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unsigned offset = 0; |
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// move to the requested offset
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seekdir(dp, payload->offset); |
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for (;;) { |
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// read the directory entry
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if (readdir_r(dp, &entry, &result)) { |
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warnx("FTP: list %s readdir_r failure\n", dirPath); |
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errorCode = kErrFailErrno; |
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break; |
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} |
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// no more entries?
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if (result == nullptr) { |
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if (payload->offset != 0 && offset == 0) { |
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// User is requesting subsequent dir entries but there were none. This means the user asked
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// to seek past EOF.
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errorCode = kErrEOF; |
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} |
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// Otherwise we are just at the last directory entry, so we leave the errorCode at kErrorNone to signal that
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break; |
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} |
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uint32_t fileSize = 0; |
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char buf[256]; |
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char direntType; |
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// Determine the directory entry type
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switch (entry.d_type) { |
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case DTYPE_FILE: |
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// For files we get the file size as well
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direntType = kDirentFile; |
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snprintf(buf, sizeof(buf), "%s/%s", dirPath, entry.d_name); |
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struct stat st; |
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if (stat(buf, &st) == 0) { |
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fileSize = st.st_size; |
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} |
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break; |
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case DTYPE_DIRECTORY: |
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if (strcmp(entry.d_name, ".") == 0 || strcmp(entry.d_name, "..") == 0) { |
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// Don't bother sending these back
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direntType = kDirentSkip; |
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} else { |
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direntType = kDirentDir; |
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} |
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break; |
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default: |
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// We only send back file and diretory entries, skip everything else
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direntType = kDirentSkip; |
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} |
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if (direntType == kDirentSkip) { |
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// Skip send only dirent identifier
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buf[0] = '\0'; |
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} else if (direntType == kDirentFile) { |
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// Files send filename and file length
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snprintf(buf, sizeof(buf), "%s\t%d", entry.d_name, fileSize); |
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} else { |
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// Everything else just sends name
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strncpy(buf, entry.d_name, sizeof(buf)); |
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buf[sizeof(buf)-1] = 0; |
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} |
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size_t nameLen = strlen(buf); |
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// Do we have room for the name, the one char directory identifier and the null terminator?
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if ((offset + nameLen + 2) > kMaxDataLength) { |
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break; |
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} |
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// Move the data into the buffer
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payload->data[offset++] = direntType; |
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strcpy((char *)&payload->data[offset], buf); |
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#ifdef MAVLINK_FTP_DEBUG |
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printf("FTP: list %s %s\n", dirPath, (char *)&payload->data[offset-1]); |
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#endif |
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offset += nameLen + 1; |
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} |
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closedir(dp); |
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payload->size = offset; |
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return errorCode; |
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} |
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/// @brief Responds to an Open command
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MavlinkFTP::ErrorCode |
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MavlinkFTP::_workOpen(PayloadHeader* payload, int oflag) |
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{ |
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int session_index = _find_unused_session(); |
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if (session_index < 0) { |
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warnx("FTP: Open failed - out of sessions\n"); |
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return kErrNoSessionsAvailable; |
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} |
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char *filename = _data_as_cstring(payload); |
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uint32_t fileSize = 0; |
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struct stat st; |
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if (stat(filename, &st) != 0) { |
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// fail only if requested open for read
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if (oflag & O_RDONLY) |
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return kErrFailErrno; |
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else |
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st.st_size = 0; |
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} |
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fileSize = st.st_size; |
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int fd = ::open(filename, oflag); |
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if (fd < 0) { |
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return kErrFailErrno; |
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} |
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_session_fds[session_index] = fd; |
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payload->session = session_index; |
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payload->size = sizeof(uint32_t); |
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*((uint32_t*)payload->data) = fileSize; |
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return kErrNone; |
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} |
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/// @brief Responds to a Read command
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MavlinkFTP::ErrorCode |
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MavlinkFTP::_workRead(PayloadHeader* payload) |
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{ |
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int session_index = payload->session; |
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if (!_valid_session(session_index)) { |
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return kErrInvalidSession; |
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} |
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// Seek to the specified position
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#ifdef MAVLINK_FTP_DEBUG |
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warnx("seek %d", payload->offset); |
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#endif |
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if (lseek(_session_fds[session_index], payload->offset, SEEK_SET) < 0) { |
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// Unable to see to the specified location
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warnx("seek fail"); |
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return kErrEOF; |
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} |
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|
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int bytes_read = ::read(_session_fds[session_index], &payload->data[0], kMaxDataLength); |
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if (bytes_read < 0) { |
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// Negative return indicates error other than eof
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warnx("read fail %d", bytes_read); |
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return kErrFailErrno; |
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} |
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|
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payload->size = bytes_read; |
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|
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return kErrNone; |
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} |
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/// @brief Responds to a Write command
|
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MavlinkFTP::ErrorCode |
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MavlinkFTP::_workWrite(PayloadHeader* payload) |
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{ |
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int session_index = payload->session; |
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|
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if (!_valid_session(session_index)) { |
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return kErrInvalidSession; |
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} |
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|
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// Seek to the specified position
|
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#ifdef MAVLINK_FTP_DEBUG |
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warnx("seek %d", payload->offset); |
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#endif |
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if (lseek(_session_fds[session_index], payload->offset, SEEK_SET) < 0) { |
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// Unable to see to the specified location
|
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warnx("seek fail"); |
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return kErrFailErrno; |
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} |
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|
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int bytes_written = ::write(_session_fds[session_index], &payload->data[0], payload->size); |
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if (bytes_written < 0) { |
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// Negative return indicates error other than eof
|
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warnx("write fail %d", bytes_written); |
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return kErrFailErrno; |
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} |
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|
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payload->size = sizeof(uint32_t); |
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*((uint32_t*)payload->data) = bytes_written; |
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|
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return kErrNone; |
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} |
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/// @brief Responds to a RemoveFile command
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MavlinkFTP::ErrorCode |
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MavlinkFTP::_workRemoveFile(PayloadHeader* payload) |
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{ |
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char file[kMaxDataLength]; |
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strncpy(file, _data_as_cstring(payload), kMaxDataLength); |
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|
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if (unlink(file) == 0) { |
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payload->size = 0; |
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return kErrNone; |
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} else { |
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return kErrFailErrno; |
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} |
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} |
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|
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/// @brief Responds to a TruncateFile command
|
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MavlinkFTP::ErrorCode |
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MavlinkFTP::_workTruncateFile(PayloadHeader* payload) |
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{ |
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char file[kMaxDataLength]; |
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const char temp_file[] = "/fs/microsd/.trunc.tmp"; |
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strncpy(file, _data_as_cstring(payload), kMaxDataLength); |
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payload->size = 0; |
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|
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// emulate truncate(file, payload->offset) by
|
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// copying to temp and overwrite with O_TRUNC flag.
|
||||
|
||||
struct stat st; |
||||
if (stat(file, &st) != 0) { |
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return kErrFailErrno; |
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} |
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|
||||
if (!S_ISREG(st.st_mode)) { |
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errno = EISDIR; |
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return kErrFailErrno; |
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} |
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|
||||
// check perms allow us to write (not romfs)
|
||||
if (!(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH))) { |
||||
errno = EROFS; |
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return kErrFailErrno; |
||||
} |
||||
|
||||
if (payload->offset == (unsigned)st.st_size) { |
||||
// nothing to do
|
||||
return kErrNone; |
||||
} |
||||
else if (payload->offset == 0) { |
||||
// 1: truncate all data
|
||||
int fd = ::open(file, O_TRUNC | O_WRONLY); |
||||
if (fd < 0) { |
||||
return kErrFailErrno; |
||||
} |
||||
|
||||
::close(fd); |
||||
return kErrNone; |
||||
} |
||||
else if (payload->offset > (unsigned)st.st_size) { |
||||
// 2: extend file
|
||||
int fd = ::open(file, O_WRONLY); |
||||
if (fd < 0) { |
||||
return kErrFailErrno; |
||||
} |
||||
|
||||
if (lseek(fd, payload->offset - 1, SEEK_SET) < 0) { |
||||
::close(fd); |
||||
return kErrFailErrno; |
||||
} |
||||
|
||||
bool ok = 1 == ::write(fd, "", 1); |
||||
::close(fd); |
||||
|
||||
return (ok)? kErrNone : kErrFailErrno; |
||||
} |
||||
else { |
||||
// 3: truncate
|
||||
if (_copy_file(file, temp_file, payload->offset) != 0) { |
||||
return kErrFailErrno; |
||||
} |
||||
if (_copy_file(temp_file, file, payload->offset) != 0) { |
||||
return kErrFailErrno; |
||||
} |
||||
if (::unlink(temp_file) != 0) { |
||||
return kErrFailErrno; |
||||
} |
||||
|
||||
return kErrNone; |
||||
} |
||||
} |
||||
|
||||
/// @brief Responds to a Terminate command
|
||||
MavlinkFTP::ErrorCode |
||||
MavlinkFTP::_workTerminate(PayloadHeader* payload) |
||||
{ |
||||
if (!_valid_session(payload->session)) { |
||||
return kErrInvalidSession; |
||||
} |
||||
|
||||
::close(_session_fds[payload->session]); |
||||
_session_fds[payload->session] = -1; |
||||
|
||||
payload->size = 0; |
||||
|
||||
return kErrNone; |
||||
} |
||||
|
||||
/// @brief Responds to a Reset command
|
||||
MavlinkFTP::ErrorCode |
||||
MavlinkFTP::_workReset(PayloadHeader* payload) |
||||
{ |
||||
for (size_t i=0; i<kMaxSession; i++) { |
||||
if (_session_fds[i] != -1) { |
||||
::close(_session_fds[i]); |
||||
_session_fds[i] = -1; |
||||
} |
||||
} |
||||
|
||||
payload->size = 0; |
||||
|
||||
return kErrNone; |
||||
} |
||||
|
||||
/// @brief Responds to a Rename command
|
||||
MavlinkFTP::ErrorCode |
||||
MavlinkFTP::_workRename(PayloadHeader* payload) |
||||
{ |
||||
char oldpath[kMaxDataLength]; |
||||
char newpath[kMaxDataLength]; |
||||
|
||||
char *ptr = _data_as_cstring(payload); |
||||
size_t oldpath_sz = strlen(ptr); |
||||
|
||||
if (oldpath_sz == payload->size) { |
||||
// no newpath
|
||||
errno = EINVAL; |
||||
return kErrFailErrno; |
||||
} |
||||
|
||||
strncpy(oldpath, ptr, kMaxDataLength); |
||||
strncpy(newpath, ptr + oldpath_sz + 1, kMaxDataLength); |
||||
|
||||
if (rename(oldpath, newpath) == 0) { |
||||
payload->size = 0; |
||||
return kErrNone; |
||||
} else { |
||||
return kErrFailErrno; |
||||
} |
||||
} |
||||
|
||||
/// @brief Responds to a RemoveDirectory command
|
||||
MavlinkFTP::ErrorCode |
||||
MavlinkFTP::_workRemoveDirectory(PayloadHeader* payload) |
||||
{ |
||||
char dir[kMaxDataLength]; |
||||
strncpy(dir, _data_as_cstring(payload), kMaxDataLength); |
||||
|
||||
if (rmdir(dir) == 0) { |
||||
payload->size = 0; |
||||
return kErrNone; |
||||
} else { |
||||
return kErrFailErrno; |
||||
} |
||||
} |
||||
|
||||
/// @brief Responds to a CreateDirectory command
|
||||
MavlinkFTP::ErrorCode |
||||
MavlinkFTP::_workCreateDirectory(PayloadHeader* payload) |
||||
{ |
||||
char dir[kMaxDataLength]; |
||||
strncpy(dir, _data_as_cstring(payload), kMaxDataLength); |
||||
|
||||
if (mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO) == 0) { |
||||
payload->size = 0; |
||||
return kErrNone; |
||||
} else { |
||||
return kErrFailErrno; |
||||
} |
||||
} |
||||
|
||||
/// @brief Responds to a CalcFileCRC32 command
|
||||
MavlinkFTP::ErrorCode |
||||
MavlinkFTP::_workCalcFileCRC32(PayloadHeader* payload) |
||||
{ |
||||
char file_buf[256]; |
||||
uint32_t checksum = 0; |
||||
ssize_t bytes_read; |
||||
strncpy(file_buf, _data_as_cstring(payload), kMaxDataLength); |
||||
|
||||
int fd = ::open(file_buf, O_RDONLY); |
||||
if (fd < 0) { |
||||
return kErrFailErrno; |
||||
} |
||||
|
||||
do { |
||||
bytes_read = ::read(fd, file_buf, sizeof(file_buf)); |
||||
if (bytes_read < 0) { |
||||
int r_errno = errno; |
||||
::close(fd); |
||||
errno = r_errno; |
||||
return kErrFailErrno; |
||||
} |
||||
|
||||
checksum = crc32part((uint8_t*)file_buf, bytes_read, checksum); |
||||
} while (bytes_read == sizeof(file_buf)); |
||||
|
||||
::close(fd); |
||||
|
||||
payload->size = sizeof(uint32_t); |
||||
*((uint32_t*)payload->data) = checksum; |
||||
return kErrNone; |
||||
} |
||||
|
||||
/// @brief Returns true if the specified session is a valid open session
|
||||
bool |
||||
MavlinkFTP::_valid_session(unsigned index) |
||||
{ |
||||
if ((index >= kMaxSession) || (_session_fds[index] < 0)) { |
||||
return false; |
||||
} |
||||
return true; |
||||
} |
||||
|
||||
/// @brief Returns an unused session index
|
||||
int |
||||
MavlinkFTP::_find_unused_session(void) |
||||
{ |
||||
for (size_t i=0; i<kMaxSession; i++) { |
||||
if (_session_fds[i] == -1) { |
||||
return i; |
||||
} |
||||
} |
||||
|
||||
return -1; |
||||
} |
||||
|
||||
/// @brief Guarantees that the payload data is null terminated.
|
||||
/// @return Returns a pointer to the payload data as a char *
|
||||
char * |
||||
MavlinkFTP::_data_as_cstring(PayloadHeader* payload) |
||||
{ |
||||
// guarantee nul termination
|
||||
if (payload->size < kMaxDataLength) { |
||||
payload->data[payload->size] = '\0'; |
||||
} else { |
||||
payload->data[kMaxDataLength - 1] = '\0'; |
||||
} |
||||
|
||||
// and return data
|
||||
return (char *)&(payload->data[0]); |
||||
} |
||||
|
||||
/// @brief Returns a unused Request entry. NULL if none available.
|
||||
MavlinkFTP::Request * |
||||
MavlinkFTP::_get_request(void) |
||||
{ |
||||
_lock_request_queue(); |
||||
Request* req = reinterpret_cast<Request *>(dq_remfirst(&_request_queue)); |
||||
_unlock_request_queue(); |
||||
return req; |
||||
} |
||||
|
||||
/// @brief Locks a semaphore to provide exclusive access to the request queue
|
||||
void |
||||
MavlinkFTP::_lock_request_queue(void) |
||||
{ |
||||
do {} |
||||
while (sem_wait(&_request_queue_sem) != 0); |
||||
} |
||||
|
||||
/// @brief Unlocks the semaphore providing exclusive access to the request queue
|
||||
void |
||||
MavlinkFTP::_unlock_request_queue(void) |
||||
{ |
||||
sem_post(&_request_queue_sem); |
||||
} |
||||
|
||||
/// @brief Returns a no longer needed request to the queue
|
||||
void |
||||
MavlinkFTP::_return_request(Request *req) |
||||
{ |
||||
_lock_request_queue(); |
||||
dq_addlast(&req->work.dq, &_request_queue); |
||||
_unlock_request_queue(); |
||||
} |
||||
|
||||
/// @brief Copy file (with limited space)
|
||||
int |
||||
MavlinkFTP::_copy_file(const char *src_path, const char *dst_path, size_t length) |
||||
{ |
||||
char buff[512]; |
||||
int src_fd = -1, dst_fd = -1; |
||||
int op_errno = 0; |
||||
|
||||
src_fd = ::open(src_path, O_RDONLY); |
||||
if (src_fd < 0) { |
||||
return -1; |
||||
} |
||||
|
||||
dst_fd = ::open(dst_path, O_CREAT | O_TRUNC | O_WRONLY); |
||||
if (dst_fd < 0) { |
||||
op_errno = errno; |
||||
::close(src_fd); |
||||
errno = op_errno; |
||||
return -1; |
||||
} |
||||
|
||||
while (length > 0) { |
||||
ssize_t bytes_read, bytes_written; |
||||
size_t blen = (length > sizeof(buff))? sizeof(buff) : length; |
||||
|
||||
bytes_read = ::read(src_fd, buff, blen); |
||||
if (bytes_read == 0) { |
||||
// EOF
|
||||
break; |
||||
} |
||||
else if (bytes_read < 0) { |
||||
warnx("cp: read"); |
||||
op_errno = errno; |
||||
break; |
||||
} |
||||
|
||||
bytes_written = ::write(dst_fd, buff, bytes_read); |
||||
if (bytes_written != bytes_read) { |
||||
warnx("cp: short write"); |
||||
op_errno = errno; |
||||
break; |
||||
} |
||||
|
||||
length -= bytes_written; |
||||
} |
||||
|
||||
::close(src_fd); |
||||
::close(dst_fd); |
||||
|
||||
errno = op_errno; |
||||
return (length > 0)? -1 : 0; |
||||
} |
File diff suppressed because it is too large
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Reference in new issue