/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
- This file is part of nss-myhostname.
+ This file is part of systemd.
Copyright 2008-2011 Lennart Poettering
+ Copyright 2014 Tom Gundersen
- nss-myhostname 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 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.
- nss-myhostname is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
+ 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 nss-myhostname; If not, see
- <http://www.gnu.org/licenses/>.
+ 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 <sys/socket.h>
-#include <sys/un.h>
-#include <asm/types.h>
-#include <inttypes.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <string.h>
-#include <assert.h>
-#include <errno.h>
-#include <limits.h>
-#include <arpa/inet.h>
-#include <unistd.h>
-#include <inttypes.h>
-#include <stdlib.h>
-
+#include "sd-rtnl.h"
+#include "rtnl-util.h"
+#include "macro.h"
#include "ifconf.h"
-int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
+static int address_compare(const void *_a, const void *_b) {
+ const struct address *a = _a, *b = _b;
- struct {
- struct nlmsghdr hdr;
- struct rtgenmsg gen;
- } req;
- struct rtgenmsg *gen;
- int fd, r, on = 1;
- uint32_t seq = 4711;
- struct address *list = NULL;
- unsigned n_list = 0;
-
- fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
- if (fd < 0)
- return -errno;
-
- if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
- r = -errno;
- goto finish;
- }
-
- memset(&req, 0, sizeof(req));
- req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
- req.hdr.nlmsg_type = RTM_GETADDR;
- req.hdr.nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK;
- req.hdr.nlmsg_seq = seq;
- req.hdr.nlmsg_pid = 0;
-
- gen = NLMSG_DATA(&req.hdr);
- gen->rtgen_family = AF_UNSPEC;
-
- if (send(fd, &req, req.hdr.nlmsg_len, 0) < 0) {
- r = -errno;
- goto finish;
- }
-
- for (;;) {
- ssize_t bytes;
- struct msghdr msg;
- struct cmsghdr *cmsg;
- struct ucred *ucred;
- struct iovec iov;
- struct nlmsghdr *p;
- uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
- struct {
- struct nlmsghdr hdr;
- struct ifaddrmsg ifaddrmsg;
- uint8_t payload[16*1024];
- } resp;
-
- memset(&iov, 0, sizeof(iov));
- iov.iov_base = &resp;
- iov.iov_len = sizeof(resp);
-
- memset(&msg, 0, sizeof(msg));
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
- msg.msg_control = cred_buffer;
- msg.msg_controllen = sizeof(cred_buffer);
- msg.msg_flags = 0;
-
- bytes = recvmsg(fd, &msg, 0);
- if (bytes < 0) {
- r = -errno;
- goto finish;
- }
+ /* Order lowest scope first, IPv4 before IPv6, lowest interface index first */
- cmsg = CMSG_FIRSTHDR(&msg);
- if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS) {
- r = -EIO;
- goto finish;
- }
+ if (a->scope < b->scope)
+ return -1;
+ if (a->scope > b->scope)
+ return 1;
- ucred = (struct ucred*) CMSG_DATA(cmsg);
- if (ucred->uid != 0 || ucred->pid != 0)
- continue;
+ if (a->family == AF_INET && b->family == AF_INET6)
+ return -1;
+ if (a->family == AF_INET6 && b->family == AF_INET)
+ return 1;
- for (p = &resp.hdr; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
- struct ifaddrmsg *ifaddrmsg;
- struct rtattr *a;
- size_t l;
- void *local = NULL, *address = NULL;
+ if (a->ifindex < b->ifindex)
+ return -1;
+ if (a->ifindex > b->ifindex)
+ return 1;
- if (!NLMSG_OK(p, (size_t) bytes)) {
- r = -EIO;
- goto finish;
- }
+ return 0;
+}
- if (p->nlmsg_seq != seq)
- continue;
+int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
+ _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ _cleanup_free_ struct address *list = NULL;
+ size_t n_list = 0, n_allocated = 0;
+ sd_rtnl_message *m;
+ int r;
+
+ r = sd_rtnl_open(&rtnl, 0);
+ if (r < 0)
+ return r;
- if (p->nlmsg_type == NLMSG_DONE) {
- r = 0;
- goto finish;
- }
+ r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
+ if (r < 0)
+ return r;
- if (p->nlmsg_type == NLMSG_ERROR) {
- struct nlmsgerr *nlmsgerr;
+ r = sd_rtnl_call(rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
- nlmsgerr = NLMSG_DATA(p);
- r = -nlmsgerr->error;
- goto finish;
- }
+ for (m = reply; m; m = sd_rtnl_message_next(m)) {
+ struct address *a;
+ unsigned char flags;
+ uint16_t type;
- if (p->nlmsg_type != RTM_NEWADDR)
- continue;
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0)
+ return r;
- ifaddrmsg = NLMSG_DATA(p);
+ r = sd_rtnl_message_get_type(m, &type);
+ if (r < 0)
+ return r;
- if (ifaddrmsg->ifa_family != AF_INET &&
- ifaddrmsg->ifa_family != AF_INET6)
- continue;
+ if (type != RTM_NEWADDR)
+ continue;
- if (ifaddrmsg->ifa_scope == RT_SCOPE_HOST ||
- ifaddrmsg->ifa_scope == RT_SCOPE_NOWHERE)
- continue;
+ r = sd_rtnl_message_addr_get_flags(m, &flags);
+ if (r < 0)
+ return r;
- if (ifaddrmsg->ifa_flags & IFA_F_DEPRECATED)
- continue;
+ if (flags & IFA_F_DEPRECATED)
+ continue;
- l = NLMSG_PAYLOAD(p, sizeof(struct ifaddrmsg));
- a = IFA_RTA(ifaddrmsg);
+ if (!GREEDY_REALLOC(list, n_allocated, n_list+1))
+ return -ENOMEM;
- while (RTA_OK(a, l)) {
+ a = list + n_list;
- if (a->rta_type == IFA_ADDRESS)
- address = RTA_DATA(a);
- else if (a->rta_type == IFA_LOCAL)
- local = RTA_DATA(a);
+ r = sd_rtnl_message_addr_get_scope(m, &a->scope);
+ if (r < 0)
+ return r;
- a = RTA_NEXT(a, l);
- }
+ if (a->scope == RT_SCOPE_HOST || a->scope == RT_SCOPE_NOWHERE)
+ continue;
- if (local)
- address = local;
+ r = sd_rtnl_message_addr_get_family(m, &a->family);
+ if (r < 0)
+ return r;
- if (!address)
- continue;
+ switch (a->family) {
- list = realloc(list, (n_list+1) * sizeof(struct address));
- if (!list) {
- r = -ENOMEM;
- goto finish;
+ 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;
- list[n_list].family = ifaddrmsg->ifa_family;
- list[n_list].scope = ifaddrmsg->ifa_scope;
- memcpy(list[n_list].address, address, ifaddrmsg->ifa_family == AF_INET ? 4 : 16);
- list[n_list].ifindex = ifaddrmsg->ifa_index;
-
- n_list++;
+ default:
+ continue;
}
- }
-finish:
- close(fd);
+ r = sd_rtnl_message_addr_get_ifindex(m, &a->ifindex);
+ if (r < 0)
+ return r;
- if (r < 0)
- free(list);
- else {
+ n_list++;
+ };
+
+ if (n_list)
qsort(list, n_list, sizeof(struct address), address_compare);
- *_list = list;
- *_n_list = n_list;
- }
+ *_list = list;
+ list = NULL;
+ *_n_list = n_list;
- return r;
+ return 0;
}
~ianmdlvl / elogind.git / blobdiff