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>
40 static int read_reply(int fd, struct address **list, unsigned *n_list) {
45 uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
48 struct ifaddrmsg ifaddrmsg;
49 uint8_t payload[16*1024];
53 .iov_len = sizeof(resp),
60 .msg_control = cred_buffer,
61 .msg_controllen = sizeof(cred_buffer),
68 bytes = recvmsg(fd, &msg, 0);
72 cmsg = CMSG_FIRSTHDR(&msg);
73 if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS)
76 ucred = (struct ucred*) CMSG_DATA(cmsg);
77 if (ucred->uid != 0 || ucred->pid != 0)
80 for (p = &resp.hdr; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
81 struct ifaddrmsg *ifaddrmsg;
84 void *local = NULL, *address = NULL;
86 if (!NLMSG_OK(p, (size_t) bytes))
89 if (p->nlmsg_seq != SEQ)
92 if (p->nlmsg_type == NLMSG_DONE)
95 if (p->nlmsg_type == NLMSG_ERROR) {
96 struct nlmsgerr *nlmsgerr;
98 nlmsgerr = NLMSG_DATA(p);
99 return -nlmsgerr->error;
102 if (p->nlmsg_type != RTM_NEWADDR)
105 ifaddrmsg = NLMSG_DATA(p);
107 if (ifaddrmsg->ifa_family != AF_INET &&
108 ifaddrmsg->ifa_family != AF_INET6)
111 if (ifaddrmsg->ifa_scope == RT_SCOPE_HOST ||
112 ifaddrmsg->ifa_scope == RT_SCOPE_NOWHERE)
115 if (ifaddrmsg->ifa_flags & IFA_F_DEPRECATED)
118 l = NLMSG_PAYLOAD(p, sizeof(struct ifaddrmsg));
119 a = IFA_RTA(ifaddrmsg);
121 while (RTA_OK(a, l)) {
123 if (a->rta_type == IFA_ADDRESS)
124 address = RTA_DATA(a);
125 else if (a->rta_type == IFA_LOCAL)
137 *list = realloc(*list, (*n_list+1) * sizeof(struct address));
141 (*list)[*n_list].family = ifaddrmsg->ifa_family;
142 (*list)[*n_list].scope = ifaddrmsg->ifa_scope;
143 memcpy((*list)[*n_list].address,
144 address, ifaddrmsg->ifa_family == AF_INET ? 4 : 16);
145 (*list)[*n_list].ifindex = ifaddrmsg->ifa_index;
154 int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
160 .nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
161 .nlmsg_type = RTM_GETADDR,
162 .nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK,
166 .rtgen_family = AF_UNSPEC,
170 struct address *list = NULL;
174 fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
178 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
183 if (send(fd, &req, req.hdr.nlmsg_len, 0) < 0) {
188 while((r = read_reply(fd, &list, &n_list)) == 0)
200 qsort(list, n_list, sizeof(struct address), address_compare);