nss-myhostname: port to sd-rtnl
This commit is contained in:
Tom Gundersen
parent
6e20c8f8fa
commit
d1ca51b153
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@ -4062,6 +4062,10 @@ libnss_myhostname_la_LDFLAGS = \
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-shared \
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-shrext .so.2
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libnss_myhostname_la_LIBADD = \
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libsystemd-shared.la \
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libsystemd-internal.la
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lib_LTLIBRARIES += \
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libnss_myhostname.la
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endif
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@ -4,6 +4,7 @@
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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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@ -19,188 +20,122 @@
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <asm/types.h>
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#include <inttypes.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <limits.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <stdlib.h>
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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 "ifconf.h"
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#define SEQ 4711
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static int read_reply(int fd, struct address **list, unsigned *n_list) {
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ssize_t bytes;
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struct cmsghdr *cmsg;
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struct ucred *ucred;
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struct nlmsghdr *p;
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uint8_t cred_buffer[CMSG_SPACE(sizeof(struct ucred))];
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struct {
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struct nlmsghdr hdr;
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struct ifaddrmsg ifaddrmsg;
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uint8_t payload[16*1024];
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} resp;
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struct iovec iov = {
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.iov_base = &resp,
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.iov_len = sizeof(resp),
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};
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struct msghdr msg = {
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.msg_name = NULL,
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.msg_namelen = 0,
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = cred_buffer,
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.msg_controllen = sizeof(cred_buffer),
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.msg_flags = 0,
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};
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assert(fd >= 0);
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assert(list);
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bytes = recvmsg(fd, &msg, 0);
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if (bytes < 0)
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return -errno;
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cmsg = CMSG_FIRSTHDR(&msg);
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if (!cmsg || cmsg->cmsg_type != SCM_CREDENTIALS)
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return -EIO;
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ucred = (struct ucred*) CMSG_DATA(cmsg);
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if (ucred->uid != 0 || ucred->pid != 0)
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return 0;
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for (p = &resp.hdr; bytes > 0; p = NLMSG_NEXT(p, bytes)) {
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struct ifaddrmsg *ifaddrmsg;
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struct rtattr *a;
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size_t l;
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void *local = NULL, *address = NULL;
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if (!NLMSG_OK(p, (size_t) bytes))
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return -EIO;
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if (p->nlmsg_seq != SEQ)
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continue;
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if (p->nlmsg_type == NLMSG_DONE)
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return 1;
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if (p->nlmsg_type == NLMSG_ERROR) {
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struct nlmsgerr *nlmsgerr;
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nlmsgerr = NLMSG_DATA(p);
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return -nlmsgerr->error;
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}
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if (p->nlmsg_type != RTM_NEWADDR)
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continue;
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ifaddrmsg = NLMSG_DATA(p);
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if (ifaddrmsg->ifa_family != AF_INET &&
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ifaddrmsg->ifa_family != AF_INET6)
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continue;
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if (ifaddrmsg->ifa_scope == RT_SCOPE_HOST ||
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ifaddrmsg->ifa_scope == RT_SCOPE_NOWHERE)
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continue;
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if (ifaddrmsg->ifa_flags & IFA_F_DEPRECATED)
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continue;
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l = NLMSG_PAYLOAD(p, sizeof(struct ifaddrmsg));
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a = IFA_RTA(ifaddrmsg);
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while (RTA_OK(a, l)) {
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if (a->rta_type == IFA_ADDRESS)
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address = RTA_DATA(a);
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else if (a->rta_type == IFA_LOCAL)
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local = RTA_DATA(a);
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a = RTA_NEXT(a, l);
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}
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if (local)
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address = local;
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if (!address)
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continue;
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*list = realloc(*list, (*n_list+1) * sizeof(struct address));
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if (!*list)
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return -ENOMEM;
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(*list)[*n_list].family = ifaddrmsg->ifa_family;
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(*list)[*n_list].scope = ifaddrmsg->ifa_scope;
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memcpy((*list)[*n_list].address,
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address, ifaddrmsg->ifa_family == AF_INET ? 4 : 16);
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(*list)[*n_list].ifindex = ifaddrmsg->ifa_index;
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(*n_list)++;
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}
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return 0;
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}
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int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
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struct {
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struct nlmsghdr hdr;
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struct rtgenmsg gen;
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} req = { {
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.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
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.nlmsg_type = RTM_GETADDR,
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.nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP|NLM_F_ACK,
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.nlmsg_seq = SEQ,
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.nlmsg_pid = 0,
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}, {
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.rtgen_family = AF_UNSPEC,
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}
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};
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int r, on = 1;
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struct address *list = NULL;
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_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
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_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
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sd_rtnl_message *m;
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_cleanup_free_ struct address *list = NULL;
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struct address *new_list = NULL;
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unsigned n_list = 0;
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int fd;
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int r;
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fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
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if (fd < 0)
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return -errno;
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if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
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r = -errno;
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goto finish;
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}
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if (send(fd, &req, req.hdr.nlmsg_len, 0) < 0) {
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r = -errno;
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goto finish;
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}
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while((r = read_reply(fd, &list, &n_list)) == 0)
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;
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finish:
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close(fd);
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if (r < 0) {
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free(list);
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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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}
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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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m = reply;
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do {
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uint16_t type;
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unsigned char scope;
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unsigned char flags;
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unsigned char family;
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int ifindex;
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union {
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struct in_addr in;
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struct in6_addr in6;
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} address;
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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_scope(m, &scope);
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if (r < 0)
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return r;
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if (scope == RT_SCOPE_HOST || scope == RT_SCOPE_NOWHERE)
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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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r = sd_rtnl_message_addr_get_family(m, &family);
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if (r < 0)
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return r;
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switch (family) {
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case AF_INET:
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r = sd_rtnl_message_read_in_addr(m, IFA_LOCAL, &address.in);
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if (r < 0) {
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r = sd_rtnl_message_read_in_addr(m, IFA_ADDRESS, &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, &address.in6);
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if (r < 0) {
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r = sd_rtnl_message_read_in6_addr(m, IFA_ADDRESS, &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, &ifindex);
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if (r < 0)
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return r;
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new_list = realloc(list, (n_list+1) * sizeof(struct address));
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if (!new_list)
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return -ENOMEM;
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else
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list = new_list;
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assert_cc(sizeof(address) <= 16);
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list[n_list].family = family;
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list[n_list].scope = scope;
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memcpy(list[n_list].address, &address, sizeof(address));
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list[n_list].ifindex = ifindex;
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n_list++;
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} while ((m = sd_rtnl_message_next(m)));
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if (n_list)
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qsort(list, n_list, sizeof(struct address), address_compare);
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*_list = list;
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*_n_list = n_list;
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*_list = list;
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list = NULL;
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return 0;
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}
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