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libseat: Use SOCK_CLOEXEC and SOCK_NONBLOCK

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This both simplifies our code and fixes an exec fd leak when using
builtin or noop backends.
This commit is contained in:
Kenny Levinsen 2022-02-09 23:21:18 +01:00
parent 96a5de8859
commit b47c79d731
2 changed files with 3 additions and 19 deletions
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2
libseat/backend/noop.c
View file

@ -109,7 +109,7 @@ static struct libseat *noop_open_seat(const struct libseat_seat_listener *listen
return NULL;
}
if (socketpair(AF_UNIX, SOCK_STREAM, 0, backend->sockets) != 0) {
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, backend->sockets) != 0) {
log_errorf("socketpair() failed: %s", strerror(errno));
free(backend);
return NULL;

20
libseat/backend/seatd.c
View file

@ -42,32 +42,16 @@ struct backend_seatd {
char seat_name[MAX_SEAT_LEN];
};
static int set_nonblock(int fd) {
int flags;
if ((flags = fcntl(fd, F_GETFD)) == -1 || fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
return -1;
}
if ((flags = fcntl(fd, F_GETFL)) == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
return -1;
}
return 0;
}
static int seatd_connect(void) {
union {
struct sockaddr_un unix;
struct sockaddr generic;
} addr = {{0}};
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
int fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
if (fd == -1) {
log_errorf("Could not create socket: %s", strerror(errno));
return -1;
}
if (set_nonblock(fd) == -1) {
log_errorf("Could not make socket non-blocking: %s", strerror(errno));
close(fd);
return -1;
}
const char *path = getenv("SEATD_SOCK");
if (path == NULL) {
path = SEATD_DEFAULTPATH;
@ -638,7 +622,7 @@ static int set_deathsig(int signal) {
static struct libseat *builtin_open_seat(const struct libseat_seat_listener *listener, void *data) {
int fds[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) {
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0, fds) == -1) {
log_errorf("Could not create socket pair: %s", strerror(errno));
return NULL;
}