File indexing completed on 2024-05-05 05:45:56

 /*
     Copyright Hannah von Reth <vonreth@kde.org>
 
     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:
     1. Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
     2. Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
 
     THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     SUCH DAMAGE.
 */
 
 #include "kshim.h"
 #include "kshimdata.h"
 
 #include <unistd.h>
 #include <sys/stat.h>
 #include <spawn.h>
 #include <sys/wait.h>
 #include <cstring>
 
 #ifdef __APPLE__
 #include <libproc.h>
 #endif
 
 #ifdef __FreeBSD__
 #include <kvm.h>
 #include <sys/param.h>
 #include <sys/sysctl.h>
 #include <sys/user.h>
 #include <libprocstat.h>
 #endif
 
 extern char **environ;
 
 std::filesystem::path KShimLib::binaryName()
 {
     static std::filesystem::path _path = [] {
         size_t size;
 #ifdef __APPLE__
         string out(PROC_PIDPATHINFO_MAXSIZE, 0);
         size = proc_pidpath(getpid(), const_cast<char *>(out.data()), out.size());
 #elif defined(__FreeBSD__)
         string out(PATH_MAX, 0);
         int error, name[4];
         size_t len = PATH_MAX;
 
         name[0] = CTL_KERN;
         name[1] = KERN_PROC;
         name[2] = KERN_PROC_PATHNAME;
         name[3] = getpid();
 
         error = sysctl(name, nitems(name), const_cast<char *>(out.data()), &len, NULL, 0);
         len--; // cut off zero-terminator
         out.resize(len);
         size = len;
 #else
         string out;
         do {
             out.resize(out.size() + 1024);
             size = readlink("/proc/self/exe", const_cast<char *>(out.data()), out.size());
         } while (out.size() == size);
 #endif
         if (size > 0) {
             out.resize(size);
         } else {
             kLog2(KLog::Type::Error) << "Failed to locate shimgen";
             exit(1);
         }
         return std::filesystem::path(out);
     }();
     return _path;
 }
 
 int KShimLib::run(const KShimData &data, const std::vector<KShimLib::string_view> &args)
 {
     for (auto &var : data.env()) {
         kLog << "setenv: " << var.first << "=" << var.second;
         if (var.second.empty()) {
             unsetenv(var.first.data());
         } else {
             setenv(var.first.data(), var.second.data(), true);
         }
     }
     std::vector<char *> arguments;
     auto addArg = [&arguments](const KShimLib::string_view &s) {
         arguments.push_back(const_cast<char *>(s.data()));
     };
     // we need to copy the string as we only pass a pointer to posix_spawn
     const auto app = data.appAbsWithOverride().native();
     auto argv0 = app;
     if (data.isKeepArgv0Enabled()) {
         argv0 = KShimLib::binaryName().native();
     }
     addArg(argv0);
     for (const auto &s : data.args()) {
         addArg(s);
     }
     for (const auto &s : args) {
         addArg(s);
     }
     // the args need to end with a null pointer
     arguments.push_back(nullptr);
 
     {
         auto log = kLog << "Command:";
         log << app;
         for (const char *s : arguments) {
             if (s) {
                 log << " " << s;
             }
         }
     }
     pid_t pid;
     int status = posix_spawn(&pid, app.data(), NULL, NULL, arguments.data(), environ);
     if (status == 0) {
         if (waitpid(pid, &status, 0) != -1) {
             if (WIFEXITED(status)) {
                 return WEXITSTATUS(status);
             } else {
                 if(WIFSIGNALED(status)) {
                     if(WCOREDUMP(status)) {
                         kLog2(KLog::Type::Error) << "KShim: the child process produced a core dump";
                     }
                     if(WTERMSIG(status)) {
                         kLog2(KLog::Type::Error) << "KShim: the child process was terminated";;
                     }
                 }
             }
         } else {
             kLog2(KLog::Type::Error) << "KShim: waitpid error";
         }
     } else {
         kLog2(KLog::Type::Error) << "KShim: posix_spawn: " << strerror(status);
     }
     return -1;
 }
 
 KShimLib::string KShimLib::getenv(const KShimLib::string_view &var,
                                   const KShimLib::string_view &fallback)
 {
     const char *env = ::getenv(var.data());
     if (env) {
         return { env };
     }
     return fallback.empty() ? "" : fallback.data();
 }
 
 std::filesystem::path KShimLib::findInPath(const std::filesystem::path &path)
 {
     auto path_env = std::stringstream(KShimLib::getenv("PATH"));
     std::string dir;
     while (std::getline(path_env, dir, ':')) {
         const auto file = std::filesystem::path(dir) / path;
         if (file != KShimLib::binaryName()) {
             struct stat sb;
             if (stat(file.string().data(), &sb) == 0 && sb.st_mode & S_IXUSR) {
                 kLog << "Found: " << file << " for " << path;
                 return file;
             }
         }
     }
     kLog2(KLog::Type::Fatal) << "Failed to locate" << path;
     return {};
 }
 
 bool KShimLib::exists(const std::filesystem::path &path)
 {
     struct stat sb;
     return stat(path.string().data(), &sb) == 0;
 }