1 #include "config.h"
2 
3 #include "download_manager.hpp"
4 
5 #include "xyz/openbmc_project/Common/error.hpp"
6 
7 #include <sys/wait.h>
8 #include <unistd.h>
9 
10 #include <phosphor-logging/elog-errors.hpp>
11 #include <phosphor-logging/elog.hpp>
12 #include <phosphor-logging/lg2.hpp>
13 
14 #include <algorithm>
15 #include <filesystem>
16 #include <iostream>
17 #include <string>
18 #include <system_error>
19 
20 namespace phosphor
21 {
22 namespace software
23 {
24 namespace manager
25 {
26 
27 using namespace sdbusplus::error::xyz::openbmc_project::common;
28 PHOSPHOR_LOG2_USING;
29 using namespace phosphor::logging;
30 namespace fs = std::filesystem;
31 
downloadViaTFTP(std::string fileName,std::string serverAddress)32 void Download::downloadViaTFTP(std::string fileName, std::string serverAddress)
33 {
34     using Argument = xyz::openbmc_project::common::InvalidArgument;
35 
36     // Sanitize the fileName string
37     if (!fileName.empty())
38     {
39         fileName.erase(std::remove(fileName.begin(), fileName.end(), '/'),
40                        fileName.end());
41         fileName = fileName.substr(fileName.find_first_not_of('.'));
42     }
43 
44     if (fileName.empty())
45     {
46         error("Filename is empty");
47         elog<InvalidArgument>(Argument::ARGUMENT_NAME("FileName"),
48                               Argument::ARGUMENT_VALUE(fileName.c_str()));
49         return;
50     }
51 
52     if (serverAddress.empty())
53     {
54         error("ServerAddress is empty");
55         elog<InvalidArgument>(Argument::ARGUMENT_NAME("ServerAddress"),
56                               Argument::ARGUMENT_VALUE(serverAddress.c_str()));
57         return;
58     }
59 
60     info("Downloading {PATH} via TFTP: {SERVERADDRESS}", "PATH", fileName,
61          "SERVERADDRESS", serverAddress);
62 
63     // Check if IMAGE DIR exists
64     fs::path imgDirPath(IMG_UPLOAD_DIR);
65     std::error_code ec;
66     if (!fs::is_directory(imgDirPath, ec))
67     {
68         error("Image Dir {PATH} does not exist: {ERROR_MSG}", "PATH",
69               imgDirPath, "ERROR_MSG", ec.message());
70         elog<InternalFailure>();
71         return;
72     }
73 
74     pid_t pid = fork();
75 
76     if (pid == 0)
77     {
78         pid_t nextPid = fork();
79         if (nextPid == 0)
80         {
81             // child process
82             execl("/usr/bin/tftp", "tftp", "-g", "-r", fileName.c_str(),
83                   serverAddress.c_str(), "-l",
84                   (std::string{IMG_UPLOAD_DIR} + '/' + fileName).c_str(),
85                   (char*)0);
86             // execl only returns on fail
87             error("Error ({ERRNO}) occurred during the TFTP call", "ERRNO",
88                   errno);
89             elog<InternalFailure>();
90         }
91         else if (nextPid < 0)
92         {
93             error("Error ({ERRNO}) occurred during fork", "ERRNO", errno);
94             elog<InternalFailure>();
95         }
96         // do nothing as parent if all is going well
97         // when parent exits, child will be reparented under init
98         // and then be reaped properly
99         exit(0);
100     }
101     else if (pid < 0)
102     {
103         error("Error ({ERRNO}) occurred during fork", "ERRNO", errno);
104         elog<InternalFailure>();
105     }
106     else
107     {
108         int status;
109         if (waitpid(pid, &status, 0) < 0)
110         {
111             error("Error ({ERRNO}) occurred during waitpid", "ERRNO", errno);
112         }
113         else if (WEXITSTATUS(status) != 0)
114         {
115             error("Failed ({STATUS}) to launch tftp", "STATUS", status);
116         }
117     }
118 
119     return;
120 }
121 
122 } // namespace manager
123 } // namespace software
124 } // namespace phosphor
125