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daemon: make sure pa has its own session and process group, but is not its leader so that we cannot acquire a tty ever

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This commit is contained in:
Lennart Poettering 2009-10-31 02:43:47 +01:00
parent 2dc37e1214
commit 8e94f65348
3 changed files with 38 additions and 20 deletions
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40
src/daemon/main.c
View file

@ -657,7 +657,7 @@ int main(int argc, char *argv[]) {
#ifdef HAVE_FORK
if (pipe(daemon_pipe) < 0) {
pa_log(_("pipe failed: %s"), pa_cstrerror(errno));
pa_log(_("pipe() failed: %s"), pa_cstrerror(errno));
goto finish;
}
@ -708,22 +708,27 @@ int main(int argc, char *argv[]) {
pa_log_set_target(PA_LOG_SYSLOG);
#ifdef HAVE_SETSID
setsid();
#endif
#ifdef HAVE_SETPGID
setpgid(0,0);
if (setsid() < 0) {
pa_log(_("setsid() failed: %s"), pa_cstrerror(errno));
goto finish;
}
#endif
#ifndef OS_IS_WIN32
pa_close(0);
pa_close(1);
pa_close(2);
/* We now are a session and process group leader. Let's fork
* again and let the father die, so that we'll become a
* process that can never acquire a TTY again, in a session and
* process group without leader */
pa_assert_se(open("/dev/null", O_RDONLY) == 0);
pa_assert_se(open("/dev/null", O_WRONLY) == 1);
pa_assert_se(open("/dev/null", O_WRONLY) == 2);
#else
FreeConsole();
#ifdef HAVE_FORK
if ((child = fork()) < 0) {
pa_log(_("fork() failed: %s"), pa_cstrerror(errno));
goto finish;
}
if (child != 0) {
retval = 0;
goto finish;
}
#endif
#ifdef SIGTTOU
@ -736,12 +741,7 @@ int main(int argc, char *argv[]) {
signal(SIGTSTP, SIG_IGN);
#endif
#ifdef TIOCNOTTY
if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
ioctl(tty_fd, TIOCNOTTY, (char*) 0);
pa_assert_se(pa_close(tty_fd) == 0);
}
#endif
pa_nullify_stdfds();
}
pa_set_env_and_record("PULSE_INTERNAL", "1");

16
src/pulsecore/core-util.c
View file

@ -2999,3 +2999,19 @@ finish:
pa_make_fd_cloexec(fileno(f));
return f;
}
void pa_nullify_stdfds(void) {
#ifndef OS_IS_WIN32
pa_close(STDIN_FILENO);
pa_close(STDOUT_FILENO);
pa_close(STDERR_FILENO);
pa_assert_se(open("/dev/null", O_RDONLY) == STDIN_FILENO);
pa_assert_se(open("/dev/null", O_WRONLY) == STDOUT_FILENO);
pa_assert_se(open("/dev/null", O_WRONLY) == STDERR_FILENO);
#else
FreeConsole();
#endif
}

2
src/pulsecore/core-util.h
View file

@ -265,4 +265,6 @@ int pa_pipe_cloexec(int pipefd[2]);
int pa_accept_cloexec(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
FILE* pa_fopen_cloexec(const char *path, const char *mode);
void pa_nullify_stdfds(void);
#endif