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ask-password-tty: properly handle SIGINT/SIGTERM

This commit is contained in:
Lennart Poettering 2010-10-26 15:15:00 +02:00
parent 501fc174c2
commit b9ba604e87
3 changed files with 51 additions and 24 deletions
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4
TODO
View File

@ -49,8 +49,6 @@
* suspend, resume
* passphrase agent https://bugs.freedesktop.org/show_bug.cgi?id=30038
* systemctl auto-pager a la git
* merge CK
@ -58,7 +56,7 @@
* start getty 2-6 only when actual vt switch happens
(same model as socket on-demand activation)
* spawn ask-password tty agent temporarily in systemctl
* ask-password: find way to disable wall agent where tty agent is running
* readahead: btrfs/LVM SSD detection

33
src/ask-password.c
View File

@ -167,14 +167,21 @@ static int parse_argv(int argc, char *argv[]) {
}
static int ask_agent(void) {
enum {
FD_SOCKET,
FD_SIGNAL,
_FD_MAX
};
char temp[] = "/dev/.systemd/ask-password/tmp.XXXXXX";
char final[sizeof(temp)] = "";
int fd = -1, r;
FILE *f = NULL;
char *socket_name = NULL;
int socket_fd = -1, signal_fd;
int socket_fd = -1, signal_fd = -1;
sigset_t mask;
usec_t not_after;
struct pollfd pollfd[_FD_MAX];
mkdir_p("/dev/.systemd/ask-password", 0755);
@ -246,13 +253,13 @@ static int ask_agent(void) {
goto finish;
}
for (;;) {
enum {
FD_SOCKET,
FD_SIGNAL,
_FD_MAX
};
zero(pollfd);
pollfd[FD_SOCKET].fd = socket_fd;
pollfd[FD_SOCKET].events = POLLIN;
pollfd[FD_SIGNAL].fd = signal_fd;
pollfd[FD_SIGNAL].events = POLLIN;
for (;;) {
char passphrase[LINE_MAX+1];
struct msghdr msghdr;
struct iovec iovec;
@ -262,16 +269,9 @@ static int ask_agent(void) {
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
} control;
ssize_t n;
struct pollfd pollfd[_FD_MAX];
int k;
zero(pollfd);
pollfd[FD_SOCKET].fd = socket_fd;
pollfd[FD_SOCKET].events = POLLIN;
pollfd[FD_SIGNAL].fd = signal_fd;
pollfd[FD_SIGNAL].events = POLLIN;
if ((k = poll(pollfd, 2, arg_timeout/USEC_PER_MSEC)) < 0) {
if ((k = poll(pollfd, _FD_MAX, arg_timeout/USEC_PER_MSEC)) < 0) {
if (errno == EINTR)
continue;
@ -366,6 +366,9 @@ finish:
if (socket_fd >= 0)
close_nointr_nofail(socket_fd);
if (signal_fd >= 0)
close_nointr_nofail(signal_fd);
if (f)
fclose(f);

38
src/tty-ask-password-agent.c
View File

@ -29,6 +29,7 @@
#include <sys/inotify.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/signalfd.h>
#include "util.h"
#include "conf-parser.h"
@ -385,8 +386,15 @@ finish:
}
static int watch_passwords(void) {
int notify;
struct pollfd pollfd;
enum {
FD_INOTIFY,
FD_SIGNAL,
_FD_MAX
};
int notify = -1, signal_fd = -1;
struct pollfd pollfd[_FD_MAX];
sigset_t mask;
int r;
mkdir_p("/dev/.systemd/ask-password", 0755);
@ -401,15 +409,27 @@ static int watch_passwords(void) {
goto finish;
}
assert_se(sigemptyset(&mask) == 0);
sigset_add_many(&mask, SIGINT, SIGTERM, -1);
assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
log_error("signalfd(): %m");
r = -errno;
goto finish;
}
zero(pollfd);
pollfd.fd = notify;
pollfd.events = POLLIN;
pollfd[FD_INOTIFY].fd = notify;
pollfd[FD_INOTIFY].events = POLLIN;
pollfd[FD_SIGNAL].fd = signal_fd;
pollfd[FD_SIGNAL].events = POLLIN;
for (;;) {
if ((r = show_passwords()) < 0)
break;
if (poll(&pollfd, 1, -1) < 0) {
if (poll(pollfd, _FD_MAX, -1) < 0) {
if (errno == EINTR)
continue;
@ -418,8 +438,11 @@ static int watch_passwords(void) {
goto finish;
}
if (pollfd.revents != 0)
if (pollfd[FD_INOTIFY].revents != 0)
flush_fd(notify);
if (pollfd[FD_SIGNAL].revents != 0)
break;
}
r = 0;
@ -428,6 +451,9 @@ finish:
if (notify >= 0)
close_nointr_nofail(notify);
if (signal_fd >= 0)
close_nointr_nofail(signal_fd);
return r;
}