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LibC: Implement openpty(), forkpty() and login_tty()

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These are used by OpenSSH.
This commit is contained in:
Gunnar Beutner 2021-04-30 03:40:38 +02:00 • committed by Andreas Kling
parent 6783f65d5a
commit f48f26f52d
4 changed files with 161 additions and 93 deletions
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126
Userland/Applications/Terminal/main.cpp
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@ -34,6 +34,7 @@
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <pty.h>
#include <pwd.h>
#include <serenity.h>
#include <signal.h>
@ -79,84 +80,27 @@ static void utmp_update(const char* tty, pid_t pid, bool create)
}
}
static pid_t run_command(int ptm_fd, String command)
static void run_command(String command)
{
pid_t pid = fork();
if (pid < 0) {
perror("fork");
dbgln("run_command: could not fork to run '{}'", command);
return pid;
String shell = "/bin/Shell";
auto* pw = getpwuid(getuid());
if (pw && pw->pw_shell) {
shell = pw->pw_shell;
}
endpwent();
if (pid == 0) {
const char* tty_name = ptsname(ptm_fd);
if (!tty_name) {
perror("ptsname");
exit(1);
}
close(ptm_fd);
int pts_fd = open(tty_name, O_RDWR);
if (pts_fd < 0) {
perror("open");
exit(1);
}
if (setsid() < 0) {
perror("setsid");
}
close(0);
close(1);
close(2);
int rc = dup2(pts_fd, 0);
if (rc < 0) {
perror("dup2");
exit(1);
}
rc = dup2(pts_fd, 1);
if (rc < 0) {
perror("dup2");
exit(1);
}
rc = dup2(pts_fd, 2);
if (rc < 0) {
perror("dup2");
exit(1);
}
rc = close(pts_fd);
if (rc < 0) {
perror("close");
exit(1);
}
rc = ioctl(0, TIOCSCTTY);
if (rc < 0) {
perror("ioctl(TIOCSCTTY)");
exit(1);
}
String shell = "/bin/Shell";
auto* pw = getpwuid(getuid());
if (pw && pw->pw_shell) {
shell = pw->pw_shell;
}
endpwent();
const char* args[4] = { shell.characters(), nullptr, nullptr, nullptr };
if (!command.is_empty()) {
args[1] = "-c";
args[2] = command.characters();
}
const char* envs[] = { "TERM=xterm", "PAGER=more", "PATH=/bin:/usr/bin:/usr/local/bin", nullptr };
rc = execve(shell.characters(), const_cast<char**>(args), const_cast<char**>(envs));
if (rc < 0) {
perror("execve");
exit(1);
}
VERIFY_NOT_REACHED();
const char* args[4] = { shell.characters(), nullptr, nullptr, nullptr };
if (!command.is_empty()) {
args[1] = "-c";
args[2] = command.characters();
}
return pid;
const char* envs[] = { "TERM=xterm", "PAGER=more", "PATH=/bin:/usr/bin:/usr/local/bin", nullptr };
int rc = execve(shell.characters(), const_cast<char**>(args), const_cast<char**>(envs));
if (rc < 0) {
perror("execve");
exit(1);
}
VERIFY_NOT_REACHED();
}
static RefPtr<GUI::Window> create_settings_window(VT::TerminalWidget& terminal)
@ -314,29 +258,25 @@ int main(int argc, char** argv)
args_parser.parse(argc, argv);
int ptm_fd = posix_openpt(O_RDWR | O_CLOEXEC);
if (ptm_fd < 0) {
perror("posix_openpt");
return 1;
}
if (grantpt(ptm_fd) < 0) {
perror("grantpt");
return 1;
}
if (unlockpt(ptm_fd) < 0) {
perror("unlockpt");
return 1;
}
RefPtr<Core::ConfigFile> config = Core::ConfigFile::get_for_app("Terminal");
Core::File::ensure_parent_directories(config->filename());
pid_t shell_pid = 0;
int ptm_fd, pts_fd;
pid_t shell_pid = forkpty(&ptm_fd, &pts_fd, nullptr, nullptr, nullptr);
if (shell_pid < 0) {
perror("forkpty");
return 1;
}
if (shell_pid == 0) {
close(ptm_fd);
if (command_to_execute)
run_command(command_to_execute);
else
run_command(config->read_entry("Startup", "Command", ""));
VERIFY_NOT_REACHED();
}
if (command_to_execute)
shell_pid = run_command(ptm_fd, command_to_execute);
else
shell_pid = run_command(ptm_fd, config->read_entry("Startup", "Command", ""));
close(pts_fd);
auto* pts_name = ptsname(ptm_fd);
utmp_update(pts_name, shell_pid, true);