1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2008-2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/socket.h>
24 #include <asm/types.h>
26 #include <linux/netlink.h>
27 #include <linux/rtnetlink.h>
32 #include <arpa/inet.h>
41 static int read_reply(int fd, struct address **list, unsigned *n_list) {
46 uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
49 struct ifaddrmsg ifaddrmsg;
50 uint8_t payload[16*1024];
54 .iov_len = sizeof(resp),
61 .msg_control = cred_buffer,
62 .msg_controllen = sizeof(cred_buffer),
69 bytes = recvmsg(fd, &msg, 0);
73 cmsg = CMSG_FIRSTHDR(&msg);
74 if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS)
77 ucred = (struct ucred*) CMSG_DATA(cmsg);
78 if (ucred->uid != 0 || ucred->pid != 0)
81 for (p = &resp.hdr; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
82 struct ifaddrmsg *ifaddrmsg;
85 void *local = NULL, *address = NULL;
87 if (!NLMSG_OK(p, (size_t) bytes))
90 if (p->nlmsg_seq != SEQ)
93 if (p->nlmsg_type == NLMSG_DONE)
96 if (p->nlmsg_type == NLMSG_ERROR) {
97 struct nlmsgerr *nlmsgerr;
99 nlmsgerr = NLMSG_DATA(p);
100 return -nlmsgerr->error;
103 if (p->nlmsg_type != RTM_NEWADDR)
106 ifaddrmsg = NLMSG_DATA(p);
108 if (ifaddrmsg->ifa_family != AF_INET &&
109 ifaddrmsg->ifa_family != AF_INET6)
112 if (ifaddrmsg->ifa_scope == RT_SCOPE_HOST ||
113 ifaddrmsg->ifa_scope == RT_SCOPE_NOWHERE)
116 if (ifaddrmsg->ifa_flags & IFA_F_DEPRECATED)
119 l = NLMSG_PAYLOAD(p, sizeof(struct ifaddrmsg));
120 a = IFA_RTA(ifaddrmsg);
122 while (RTA_OK(a, l)) {
124 if (a->rta_type == IFA_ADDRESS)
125 address = RTA_DATA(a);
126 else if (a->rta_type == IFA_LOCAL)
138 *list = realloc(*list, (*n_list+1) * sizeof(struct address));
142 (*list)[*n_list].family = ifaddrmsg->ifa_family;
143 (*list)[*n_list].scope = ifaddrmsg->ifa_scope;
144 memcpy((*list)[*n_list].address,
145 address, ifaddrmsg->ifa_family == AF_INET ? 4 : 16);
146 (*list)[*n_list].ifindex = ifaddrmsg->ifa_index;
155 int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
161 .nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
162 .nlmsg_type = RTM_GETADDR,
163 .nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK,
167 .rtgen_family = AF_UNSPEC,
171 struct address *list = NULL;
175 fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
179 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
184 if (send(fd, &req, req.hdr.nlmsg_len, 0) < 0) {
189 while((r = read_reply(fd, &list, &n_list)) == 0)
201 qsort(list, n_list, sizeof(struct address), address_compare);