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log, passt: Always print to stderr before initialisation is complete

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After commit 15001b39ef ("conf: set the log level much earlier"), we
had a phase during initialisation when messages wouldn't be printed to
standard error anymore.

Commit f67238aa86 ("passt, log: Call __openlog() earlier, log to
stderr until we detach") fixed that, but only for the case where no
log files are given.

If a log file is configured, vlogmsg() will not call passt_vsyslog(),
but during initialisation, LOG_PERROR is set, so to avoid duplicated
prints (which would result from passt_vsyslog() printing to stderr),
we don't call fprintf() from vlogmsg() either.

This is getting a bit too complicated. Instead of abusing LOG_PERROR,
define an internal logging flag that clearly represents that we're not
done with the initialisation phase yet.

If this flag is not set, make sure we always print to stderr, if the
log mask matches.

Reported-by: Yalan Zhang <yalzhang@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2024-06-14 22:47:51 +02:00
parent 8c2f24a560
commit afd9cdc9bb
3 changed files with 14 additions and 15 deletions

11
passt.c
View file

@ -200,8 +200,8 @@ void exit_handler(int signal)
int main(int argc, char **argv)
{
struct epoll_event events[EPOLL_EVENTS];
char *log_name, argv0[PATH_MAX], *name;
int nfds, i, devnull_fd = -1;
char argv0[PATH_MAX], *name;
struct ctx c = { 0 };
struct rlimit limit;
struct timespec now;
@ -225,7 +225,7 @@ int main(int argc, char **argv)
strncpy(argv0, argv[0], PATH_MAX - 1);
name = basename(argv0);
if (strstr(name, "pasta")) {
__openlog(log_name = "pasta", LOG_PERROR, LOG_DAEMON);
__openlog("pasta", 0, LOG_DAEMON);
sa.sa_handler = pasta_child_handler;
if (sigaction(SIGCHLD, &sa, NULL)) {
@ -240,7 +240,7 @@ int main(int argc, char **argv)
c.mode = MODE_PASTA;
} else if (strstr(name, "passt")) {
__openlog(log_name = "passt", LOG_PERROR, LOG_DAEMON);
__openlog("passt", 0, LOG_DAEMON);
c.mode = MODE_PASST;
} else {
@ -302,14 +302,13 @@ int main(int argc, char **argv)
if (isolate_prefork(&c))
die("Failed to sandbox process, exiting");
if (!c.foreground)
__openlog(log_name, 0, LOG_DAEMON);
if (!c.foreground)
__daemon(c.pidfile_fd, devnull_fd);
else
pidfile_write(c.pidfile_fd, getpid());
log_runtime = true;
if (pasta_child_pid)
kill(pasta_child_pid, SIGUSR1);