nss-myhostname: move local address listing logic into shared, so that we can make use of it from machined
This commit is contained in:
Lennart Poettering
@@ -0,0 +1,150 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2008-2011 Lennart Poettering
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Copyright 2014 Tom Gundersen
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sd-rtnl.h"
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#include "rtnl-util.h"
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#include "macro.h"
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#include "local-addresses.h"
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static int address_compare(const void *_a, const void *_b) {
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const struct local_address *a = _a, *b = _b;
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/* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
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if (a->scope < b->scope)
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return -1;
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if (a->scope > b->scope)
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return 1;
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if (a->family == AF_INET && b->family == AF_INET6)
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return -1;
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if (a->family == AF_INET6 && b->family == AF_INET)
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return 1;
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if (a->ifindex < b->ifindex)
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return -1;
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if (a->ifindex > b->ifindex)
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return 1;
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return 0;
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}
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int local_addresses(struct local_address **ret) {
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_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
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_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
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_cleanup_free_ struct local_address *list = NULL;
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size_t n_list = 0, n_allocated = 0;
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sd_rtnl_message *m;
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int r;
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assert(ret);
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r = sd_rtnl_open(&rtnl, 0);
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if (r < 0)
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return r;
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r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
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if (r < 0)
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return r;
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r = sd_rtnl_call(rtnl, req, 0, &reply);
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if (r < 0)
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return r;
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for (m = reply; m; m = sd_rtnl_message_next(m)) {
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struct local_address *a;
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unsigned char flags;
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uint16_t type;
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r = sd_rtnl_message_get_errno(m);
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if (r < 0)
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return r;
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r = sd_rtnl_message_get_type(m, &type);
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if (r < 0)
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return r;
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if (type != RTM_NEWADDR)
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continue;
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r = sd_rtnl_message_addr_get_flags(m, &flags);
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if (r < 0)
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return r;
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if (flags & IFA_F_DEPRECATED)
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continue;
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if (!GREEDY_REALLOC(list, n_allocated, n_list+1))
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return -ENOMEM;
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a = list + n_list;
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r = sd_rtnl_message_addr_get_scope(m, &a->scope);
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if (r < 0)
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return r;
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if (a->scope == RT_SCOPE_HOST || a->scope == RT_SCOPE_NOWHERE)
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continue;
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r = sd_rtnl_message_addr_get_family(m, &a->family);
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if (r < 0)
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return r;
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switch (a->family) {
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case AF_INET:
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r = sd_rtnl_message_read_in_addr(m, IFA_LOCAL, &a->address.in);
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if (r < 0) {
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r = sd_rtnl_message_read_in_addr(m, IFA_ADDRESS, &a->address.in);
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if (r < 0)
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continue;
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}
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break;
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case AF_INET6:
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r = sd_rtnl_message_read_in6_addr(m, IFA_LOCAL, &a->address.in6);
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if (r < 0) {
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r = sd_rtnl_message_read_in6_addr(m, IFA_ADDRESS, &a->address.in6);
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if (r < 0)
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continue;
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}
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break;
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default:
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continue;
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}
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r = sd_rtnl_message_addr_get_ifindex(m, &a->ifindex);
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if (r < 0)
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return r;
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n_list++;
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};
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if (n_list)
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qsort(list, n_list, sizeof(struct local_address), address_compare);
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*ret = list;
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list = NULL;
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return (int) n_list;
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}
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@@ -0,0 +1,37 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2008-2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <inttypes.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <sys/socket.h>
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#include "socket-util.h"
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struct local_address {
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int ifindex;
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unsigned char family, scope;
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union in_addr_union address;
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};
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int local_addresses(struct local_address **ret);
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