diff options
author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
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committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
commit | bb110bc7433adeb79b4814ef2a1c04e2160be396 (patch) | |
tree | c45048907133b8bbd7e2d86b350436a9ad0ffe8b /src/libcore/loopback-setup.c | |
parent | 192d82912f055a2b4a2b5c02f0ef69b002322bba (diff) |
./move.sh
Diffstat (limited to 'src/libcore/loopback-setup.c')
-rw-r--r-- | src/libcore/loopback-setup.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/libcore/loopback-setup.c b/src/libcore/loopback-setup.c new file mode 100644 index 0000000000..d56bbfa6fc --- /dev/null +++ b/src/libcore/loopback-setup.c @@ -0,0 +1,90 @@ +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <net/if.h> +#include <stdlib.h> + +#include <systemd/sd-netlink.h> + +#include "loopback-setup.h" +#include "missing.h" +#include "netlink-util.h" + +static int start_loopback(sd_netlink *rtnl) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL; + int r; + + r = sd_rtnl_message_new_link(rtnl, &req, RTM_SETLINK, LOOPBACK_IFINDEX); + if (r < 0) + return r; + + r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP); + if (r < 0) + return r; + + r = sd_netlink_call(rtnl, req, 0, NULL); + if (r < 0) + return r; + + return 0; +} + +static bool check_loopback(sd_netlink *rtnl) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; + unsigned flags; + int r; + + r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, LOOPBACK_IFINDEX); + if (r < 0) + return false; + + r = sd_netlink_call(rtnl, req, 0, &reply); + if (r < 0) + return false; + + r = sd_rtnl_message_link_get_flags(reply, &flags); + if (r < 0) + return false; + + return flags & IFF_UP; +} + +int loopback_setup(void) { + _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; + int r; + + r = sd_netlink_open(&rtnl); + if (r < 0) + return r; + + r = start_loopback(rtnl); + if (r < 0) { + + /* If we lack the permissions to configure the + * loopback device, but we find it to be already + * configured, let's exit cleanly, in order to + * supported unprivileged containers. */ + if (r == -EPERM && check_loopback(rtnl)) + return 0; + + return log_warning_errno(r, "Failed to configure loopback device: %m"); + } + + return 0; +} |