1*4d49ae65SPatrick Venture /* 2*4d49ae65SPatrick Venture * Copyright 2018 Google Inc. 3*4d49ae65SPatrick Venture * 4*4d49ae65SPatrick Venture * Licensed under the Apache License, Version 2.0 (the "License"); 5*4d49ae65SPatrick Venture * you may not use this file except in compliance with the License. 6*4d49ae65SPatrick Venture * You may obtain a copy of the License at 7*4d49ae65SPatrick Venture * 8*4d49ae65SPatrick Venture * http://www.apache.org/licenses/LICENSE-2.0 9*4d49ae65SPatrick Venture * 10*4d49ae65SPatrick Venture * Unless required by applicable law or agreed to in writing, software 11*4d49ae65SPatrick Venture * distributed under the License is distributed on an "AS IS" BASIS, 12*4d49ae65SPatrick Venture * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13*4d49ae65SPatrick Venture * See the License for the specific language governing permissions and 14*4d49ae65SPatrick Venture * limitations under the License. 15*4d49ae65SPatrick Venture */ 16*4d49ae65SPatrick Venture 17*4d49ae65SPatrick Venture #include "cable.hpp" 18*4d49ae65SPatrick Venture 19*4d49ae65SPatrick Venture #include "main.hpp" 20*4d49ae65SPatrick Venture 21*4d49ae65SPatrick Venture #include <cstdint> 22*4d49ae65SPatrick Venture #include <experimental/filesystem> 23*4d49ae65SPatrick Venture #include <fstream> 24*4d49ae65SPatrick Venture #include <sstream> 25*4d49ae65SPatrick Venture #include <string> 26*4d49ae65SPatrick Venture #include <system_error> 27*4d49ae65SPatrick Venture 28*4d49ae65SPatrick Venture namespace google 29*4d49ae65SPatrick Venture { 30*4d49ae65SPatrick Venture namespace ipmi 31*4d49ae65SPatrick Venture { 32*4d49ae65SPatrick Venture namespace fs = std::experimental::filesystem; 33*4d49ae65SPatrick Venture 34*4d49ae65SPatrick Venture struct CableRequest 35*4d49ae65SPatrick Venture { 36*4d49ae65SPatrick Venture uint8_t subcommand; 37*4d49ae65SPatrick Venture uint8_t if_name_len; 38*4d49ae65SPatrick Venture uint8_t if_name[0]; 39*4d49ae65SPatrick Venture } __attribute__((packed)); 40*4d49ae65SPatrick Venture 41*4d49ae65SPatrick Venture struct CableReply 42*4d49ae65SPatrick Venture { 43*4d49ae65SPatrick Venture uint8_t subcommand; 44*4d49ae65SPatrick Venture uint8_t value; 45*4d49ae65SPatrick Venture } __attribute__((packed)); 46*4d49ae65SPatrick Venture 47*4d49ae65SPatrick Venture ipmi_ret_t CableCheck(const uint8_t* reqBuf, uint8_t* replyBuf, size_t* dataLen) 48*4d49ae65SPatrick Venture { 49*4d49ae65SPatrick Venture // There is an IPMI LAN channel statistics command which could be used for 50*4d49ae65SPatrick Venture // this type of check, however, we're not able to wait for the OpenBMC 51*4d49ae65SPatrick Venture // implementation to stabilize related to the network management. 52*4d49ae65SPatrick Venture // 53*4d49ae65SPatrick Venture // There is a link status file, but it is "unknown" to start with... 54*4d49ae65SPatrick Venture // The path we're checking: /sys/class/net/eth1/statistics/rx_packets 55*4d49ae65SPatrick Venture 56*4d49ae65SPatrick Venture // This command is expecting: [0x00][len][if_name] 57*4d49ae65SPatrick Venture if ((*dataLen) < sizeof(struct CableRequest) + sizeof(uint8_t)) 58*4d49ae65SPatrick Venture { 59*4d49ae65SPatrick Venture fprintf(stderr, "Invalid command length: %lu\n", (*dataLen)); 60*4d49ae65SPatrick Venture return IPMI_CC_INVALID; 61*4d49ae65SPatrick Venture } 62*4d49ae65SPatrick Venture 63*4d49ae65SPatrick Venture const auto request = 64*4d49ae65SPatrick Venture reinterpret_cast<const struct CableRequest*>(&reqBuf[0]); 65*4d49ae65SPatrick Venture 66*4d49ae65SPatrick Venture // Sanity check the object contents. 67*4d49ae65SPatrick Venture if (request->if_name_len == 0) 68*4d49ae65SPatrick Venture { 69*4d49ae65SPatrick Venture fprintf(stderr, "Invalid string length: %d\n", request->if_name_len); 70*4d49ae65SPatrick Venture return IPMI_CC_INVALID; 71*4d49ae65SPatrick Venture } 72*4d49ae65SPatrick Venture 73*4d49ae65SPatrick Venture // Verify the request buffer contains the object and the string. 74*4d49ae65SPatrick Venture if ((*dataLen) < (sizeof(struct CableRequest) + request->if_name_len)) 75*4d49ae65SPatrick Venture { 76*4d49ae65SPatrick Venture fprintf(stderr, "*dataLen too small: %lu\n", (*dataLen)); 77*4d49ae65SPatrick Venture return IPMI_CC_INVALID; 78*4d49ae65SPatrick Venture } 79*4d49ae65SPatrick Venture 80*4d49ae65SPatrick Venture // Maximum length one can specify, plus null terminator. 81*4d49ae65SPatrick Venture char nameBuf[256] = {}; 82*4d49ae65SPatrick Venture std::ostringstream opath; 83*4d49ae65SPatrick Venture 84*4d49ae65SPatrick Venture // Copy the string out of the request buffer. 85*4d49ae65SPatrick Venture memcpy(&nameBuf[0], request->if_name, request->if_name_len); 86*4d49ae65SPatrick Venture std::string name = nameBuf; 87*4d49ae65SPatrick Venture 88*4d49ae65SPatrick Venture // Minor sanity & security check (of course, I'm less certain if unicode 89*4d49ae65SPatrick Venture // comes into play here. 90*4d49ae65SPatrick Venture // 91*4d49ae65SPatrick Venture // Basically you can't easily inject ../ or /../ into the path below. 92*4d49ae65SPatrick Venture if (name.find("/") != std::string::npos) 93*4d49ae65SPatrick Venture { 94*4d49ae65SPatrick Venture fprintf(stderr, "Invalid or illegal name: '%s'\n", nameBuf); 95*4d49ae65SPatrick Venture return IPMI_CC_INVALID; 96*4d49ae65SPatrick Venture } 97*4d49ae65SPatrick Venture 98*4d49ae65SPatrick Venture opath << "/sys/class/net/" << name << "/statistics/rx_packets"; 99*4d49ae65SPatrick Venture std::string path = opath.str(); 100*4d49ae65SPatrick Venture 101*4d49ae65SPatrick Venture std::error_code ec; 102*4d49ae65SPatrick Venture if (!fs::exists(path, ec)) 103*4d49ae65SPatrick Venture { 104*4d49ae65SPatrick Venture fprintf(stderr, "Path: '%s' doesn't exist.\n", path.c_str()); 105*4d49ae65SPatrick Venture return IPMI_CC_INVALID; 106*4d49ae65SPatrick Venture } 107*4d49ae65SPatrick Venture // We're uninterested in the state of ec. 108*4d49ae65SPatrick Venture 109*4d49ae65SPatrick Venture // Read the file and check the result. 110*4d49ae65SPatrick Venture int64_t count = 0; 111*4d49ae65SPatrick Venture std::ifstream ifs; 112*4d49ae65SPatrick Venture ifs.exceptions(std::ifstream::failbit); 113*4d49ae65SPatrick Venture try 114*4d49ae65SPatrick Venture { 115*4d49ae65SPatrick Venture ifs.open(path); 116*4d49ae65SPatrick Venture ifs >> count; 117*4d49ae65SPatrick Venture } 118*4d49ae65SPatrick Venture catch (std::ios_base::failure& fail) 119*4d49ae65SPatrick Venture { 120*4d49ae65SPatrick Venture return IPMI_CC_INVALID; 121*4d49ae65SPatrick Venture } 122*4d49ae65SPatrick Venture 123*4d49ae65SPatrick Venture struct CableReply reply; 124*4d49ae65SPatrick Venture reply.subcommand = SysCableCheck; 125*4d49ae65SPatrick Venture reply.value = 0x00; // Default false 126*4d49ae65SPatrick Venture 127*4d49ae65SPatrick Venture // If we have received packets then there is a cable present. 128*4d49ae65SPatrick Venture reply.value = (count > 0) ? 1 : 0; 129*4d49ae65SPatrick Venture 130*4d49ae65SPatrick Venture // Return the subcommand and the result. 131*4d49ae65SPatrick Venture memcpy(&replyBuf[0], &reply, sizeof(struct CableReply)); 132*4d49ae65SPatrick Venture (*dataLen) = sizeof(struct CableReply); 133*4d49ae65SPatrick Venture 134*4d49ae65SPatrick Venture return IPMI_CC_OK; 135*4d49ae65SPatrick Venture } 136*4d49ae65SPatrick Venture 137*4d49ae65SPatrick Venture } // namespace ipmi 138*4d49ae65SPatrick Venture } // namespace google 139