diff options
| author |   deraadt <deraadt@openbsd.org> | 2004-05-05 14:29:16 +0000 |
|---|---|---|
| committer | deraadt <deraadt@openbsd.org> | 2004-05-05 14:29:16 +0000 |
| commit | 64267e7d6938bcdf3f920e2d28d7522dc85d367c (patch) | |
| tree | 7cae516f7cbf3c23f79acd1542e3e2c531bfcf84 | |
| parent | bpf write filter, and lock (diff) | |
| download | wireguard-openbsd-64267e7d6938bcdf3f920e2d28d7522dc85d367c.tar.xz wireguard-openbsd-64267e7d6938bcdf3f920e2d28d7522dc85d367c.zip | |
must simulate daemon because already inside the jail; henning ok
| -rw-r--r-- | sbin/dhclient/dhclient.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/sbin/dhclient/dhclient.c b/sbin/dhclient/dhclient.c index bcdb87749c7..0807a2face6 100644 --- a/sbin/dhclient/dhclient.c +++ b/sbin/dhclient/dhclient.c @@ -1,4 +1,4 @@ -/* $OpenBSD: dhclient.c,v 1.45 2004/05/05 13:21:49 henning Exp $ */ +/* $OpenBSD: dhclient.c,v 1.46 2004/05/05 14:29:16 deraadt Exp $ */ /* * Copyright 2004 Henning Brauer <henning@openbsd.org> @@ -79,6 +79,7 @@ char *path_dhclient_db = NULL; int log_perror = 1; int privfd; +int nullfd = -1; struct iaddr iaddr_broadcast = { 4, { 255, 255, 255, 255 } }; struct in_addr inaddr_any; @@ -281,6 +282,9 @@ main(int argc, char *argv[]) fprintf(stderr, "got link\n"); } + if ((nullfd = open(_PATH_DEVNULL, O_RDWR, 0)) == -1) + error("cannot open %s: %m", _PATH_DEVNULL); + if ((pw = getpwnam("_dhcp")) == NULL) error("no such user: _dhcp"); @@ -2088,6 +2092,15 @@ go_daemon(void) if (daemon(1, 0) == -1) error("daemon"); + + /* we are chrooted, daemon(3) fails to open /dev/null */ + if (nullfd != -1) { + dup2(nullfd, STDIN_FILENO); + dup2(nullfd, STDOUT_FILENO); + dup2(nullfd, STDERR_FILENO); + close(nullfd); + nullfd = -1; + } } int @@ -2296,6 +2309,10 @@ fork_privchld(int fd, int fd2) setproctitle("%s [priv]", ifi->name); + dup2(nullfd, STDIN_FILENO); + dup2(nullfd, STDOUT_FILENO); + dup2(nullfd, STDERR_FILENO); + close(nullfd); close(fd2); for (;;) { |