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authorLennart Poettering <lennart@poettering.net>2014-07-10 21:01:25 +0200
committerLennart Poettering <lennart@poettering.net>2014-07-10 21:01:25 +0200
commite80af1bdddbc7a51191e29b0c841e8dcafe7b1cc (patch)
tree5d5a8fdf839a667a3c2e5f0862341e41bb455135 /src/libsystemd/sd-rtnl/local-addresses.c
parent947127ff6230b44623afec3e6aacc85f54168db2 (diff)
nss-myhostname: move local address listing logic into shared, so that we can make use of it from machined
Diffstat (limited to 'src/libsystemd/sd-rtnl/local-addresses.c')
-rw-r--r--src/libsystemd/sd-rtnl/local-addresses.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/src/libsystemd/sd-rtnl/local-addresses.c b/src/libsystemd/sd-rtnl/local-addresses.c
new file mode 100644
index 0000000000..dd5ccedc9d
--- /dev/null
+++ b/src/libsystemd/sd-rtnl/local-addresses.c
@@ -0,0 +1,150 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2008-2011 Lennart Poettering
+ Copyright 2014 Tom Gundersen
+
+ 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 "sd-rtnl.h"
+#include "rtnl-util.h"
+#include "macro.h"
+#include "local-addresses.h"
+
+static int address_compare(const void *_a, const void *_b) {
+ const struct local_address *a = _a, *b = _b;
+
+ /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
+
+ if (a->scope < b->scope)
+ return -1;
+ if (a->scope > b->scope)
+ return 1;
+
+ if (a->family == AF_INET && b->family == AF_INET6)
+ return -1;
+ if (a->family == AF_INET6 && b->family == AF_INET)
+ return 1;
+
+ if (a->ifindex < b->ifindex)
+ return -1;
+ if (a->ifindex > b->ifindex)
+ return 1;
+
+ return 0;
+}
+
+int local_addresses(struct local_address **ret) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
+ _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ _cleanup_free_ struct local_address *list = NULL;
+ size_t n_list = 0, n_allocated = 0;
+ sd_rtnl_message *m;
+ int r;
+
+ assert(ret);
+
+ r = sd_rtnl_open(&rtnl, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_call(rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+
+ for (m = reply; m; m = sd_rtnl_message_next(m)) {
+ struct local_address *a;
+ unsigned char flags;
+ uint16_t type;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0)
+ return r;
+
+ r = sd_rtnl_message_get_type(m, &type);
+ if (r < 0)
+ return r;
+
+ if (type != RTM_NEWADDR)
+ continue;
+
+ r = sd_rtnl_message_addr_get_flags(m, &flags);
+ if (r < 0)
+ return r;
+
+ if (flags & IFA_F_DEPRECATED)
+ continue;
+
+ if (!GREEDY_REALLOC(list, n_allocated, n_list+1))
+ return -ENOMEM;
+
+ a = list + n_list;
+
+ r = sd_rtnl_message_addr_get_scope(m, &a->scope);
+ if (r < 0)
+ return r;
+
+ if (a->scope == RT_SCOPE_HOST || a->scope == RT_SCOPE_NOWHERE)
+ continue;
+
+ r = sd_rtnl_message_addr_get_family(m, &a->family);
+ if (r < 0)
+ return r;
+
+ switch (a->family) {
+
+ case AF_INET:
+ r = sd_rtnl_message_read_in_addr(m, IFA_LOCAL, &a->address.in);
+ if (r < 0) {
+ r = sd_rtnl_message_read_in_addr(m, IFA_ADDRESS, &a->address.in);
+ if (r < 0)
+ continue;
+ }
+ break;
+
+ case AF_INET6:
+ r = sd_rtnl_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6);
+ if (r < 0) {
+ r = sd_rtnl_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6);
+ if (r < 0)
+ continue;
+ }
+ break;
+
+ default:
+ continue;
+ }
+
+ r = sd_rtnl_message_addr_get_ifindex(m, &a->ifindex);
+ if (r < 0)
+ return r;
+
+ n_list++;
+ };
+
+ if (n_list)
+ qsort(list, n_list, sizeof(struct local_address), address_compare);
+
+ *ret = list;
+ list = NULL;
+
+ return (int) n_list;
+}