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-rw-r--r--src/nss-myhostname/netlink.c245
1 files changed, 90 insertions, 155 deletions
diff --git a/src/nss-myhostname/netlink.c b/src/nss-myhostname/netlink.c
index d61ecdfd40..b4a464c06a 100644
--- a/src/nss-myhostname/netlink.c
+++ b/src/nss-myhostname/netlink.c
@@ -4,6 +4,7 @@
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
@@ -19,188 +20,122 @@
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 <stdlib.h>
+#include "sd-rtnl.h"
+#include "rtnl-util.h"
+#include "macro.h"
#include "ifconf.h"
-#define SEQ 4711
-
-static int read_reply(int fd, struct address **list, unsigned *n_list) {
- ssize_t bytes;
- struct cmsghdr *cmsg;
- struct ucred *ucred;
- 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;
- struct iovec iov = {
- .iov_base = &resp,
- .iov_len = sizeof(resp),
- };
- struct msghdr msg = {
- .msg_name = NULL,
- .msg_namelen = 0,
- .msg_iov = &iov,
- .msg_iovlen = 1,
- .msg_control = cred_buffer,
- .msg_controllen = sizeof(cred_buffer),
- .msg_flags = 0,
- };
-
- assert(fd >= 0);
- assert(list);
-
- bytes = recvmsg(fd, &msg, 0);
- if (bytes < 0)
- return -errno;
-
- cmsg = CMSG_FIRSTHDR(&msg);
- if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS)
- return -EIO;
-
- ucred = (struct ucred*) CMSG_DATA(cmsg);
- if (ucred->uid != 0 || ucred->pid != 0)
- return 0;
-
- 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 (!NLMSG_OK(p, (size_t) bytes))
- return -EIO;
-
- if (p->nlmsg_seq != SEQ)
- continue;
-
- if (p->nlmsg_type == NLMSG_DONE)
- return 1;
+int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
+ _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
+ sd_rtnl_message *m;
+ _cleanup_free_ struct address *list = NULL;
+ struct address *new_list = NULL;
+ unsigned n_list = 0;
+ int r;
- if (p->nlmsg_type == NLMSG_ERROR) {
- struct nlmsgerr *nlmsgerr;
+ r = sd_rtnl_open(&rtnl, 0);
+ if (r < 0)
+ return r;
- nlmsgerr = NLMSG_DATA(p);
- return -nlmsgerr->error;
- }
+ r = sd_rtnl_message_new_addr(rtnl, &req, RTM_GETADDR, 0, AF_UNSPEC);
+ if (r < 0)
+ return r;
- if (p->nlmsg_type != RTM_NEWADDR)
+ r = sd_rtnl_call(rtnl, req, 0, &reply);
+ if (r < 0)
+ return r;
+ m = reply;
+
+ do {
+ uint16_t type;
+ unsigned char scope;
+ unsigned char flags;
+ unsigned char family;
+ int ifindex;
+ union {
+ struct in_addr in;
+ struct in6_addr in6;
+ } address;
+
+ 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;
- ifaddrmsg = NLMSG_DATA(p);
+ r = sd_rtnl_message_addr_get_scope(m, &scope);
+ if (r < 0)
+ return r;
- if (ifaddrmsg->ifa_family != AF_INET &&
- ifaddrmsg->ifa_family != AF_INET6)
+ if (scope == RT_SCOPE_HOST || scope == RT_SCOPE_NOWHERE)
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)
+ if (flags & IFA_F_DEPRECATED)
continue;
- l = NLMSG_PAYLOAD(p, sizeof(struct ifaddrmsg));
- a = IFA_RTA(ifaddrmsg);
-
- while (RTA_OK(a, l)) {
-
- if (a->rta_type == IFA_ADDRESS)
- address = RTA_DATA(a);
- else if (a->rta_type == IFA_LOCAL)
- local = RTA_DATA(a);
-
- a = RTA_NEXT(a, l);
- }
-
- if (local)
- address = local;
-
- if (!address)
+ r = sd_rtnl_message_addr_get_family(m, &family);
+ if (r < 0)
+ return r;
+
+ switch (family) {
+ case AF_INET:
+ r = sd_rtnl_message_read_in_addr(m, IFA_LOCAL, &address.in);
+ if (r < 0) {
+ r = sd_rtnl_message_read_in_addr(m, IFA_ADDRESS, &address.in);
+ if (r < 0)
+ continue;
+ }
+ break;
+ case AF_INET6:
+ r = sd_rtnl_message_read_in6_addr(m, IFA_LOCAL, &address.in6);
+ if (r < 0) {
+ r = sd_rtnl_message_read_in6_addr(m, IFA_ADDRESS, &address.in6);
+ if (r < 0)
+ continue;
+ }
+ break;
+ default:
continue;
-
- *list = realloc(*list, (*n_list+1) * sizeof(struct address));
- if (!*list)
- return -ENOMEM;
-
- (*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)++;
- }
-
- return 0;
-}
-
-
-int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
-
- struct {
- struct nlmsghdr hdr;
- struct rtgenmsg gen;
- } req = { {
- .nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
- .nlmsg_type = RTM_GETADDR,
- .nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK,
- .nlmsg_seq = SEQ,
- .nlmsg_pid = 0,
- }, {
- .rtgen_family = AF_UNSPEC,
}
- };
- int r, on = 1;
- struct address *list = NULL;
- unsigned n_list = 0;
- int fd;
- fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
- if (fd < 0)
- return -errno;
+ r = sd_rtnl_message_addr_get_ifindex(m, &ifindex);
+ if (r < 0)
+ return r;
- if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
- r = -errno;
- goto finish;
- }
+ new_list = realloc(list, (n_list+1) * sizeof(struct address));
+ if (!new_list)
+ return -ENOMEM;
+ else
+ list = new_list;
- if (send(fd, &req, req.hdr.nlmsg_len, 0) < 0) {
- r = -errno;
- goto finish;
- }
+ assert_cc(sizeof(address) <= 16);
- while((r = read_reply(fd, &list, &n_list)) == 0)
- ;
+ list[n_list].family = family;
+ list[n_list].scope = scope;
+ memcpy(list[n_list].address, &address, sizeof(address));
+ list[n_list].ifindex = ifindex;
-finish:
- close(fd);
+ n_list++;
- if (r < 0) {
- free(list);
- return r;
- }
+ } while ((m = sd_rtnl_message_next(m)));
if (n_list)
qsort(list, n_list, sizeof(struct address), address_compare);
- *_list = list;
*_n_list = n_list;
+ *_list = list;
+ list = NULL;
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-04 20:51:29 +0000