static void netlink_receive_link(struct netlink_data *netlink,
void (*cb)(void *ctx, struct ifinfomsg *ifi,
u8 *buf, size_t len),
struct nlmsghdr *h)
{
if (cb == NULL || NLMSG_PAYLOAD(h, 0) < sizeof(struct ifinfomsg))
return;
cb(netlink->cfg->ctx, NLMSG_DATA(h),
(u8 *) NLMSG_DATA(h) + NLMSG_ALIGN(sizeof(struct ifinfomsg)),
NLMSG_PAYLOAD(h, sizeof(struct ifinfomsg)));
}
static void genl_print_ctrl_family(struct nlmsghdr *hdr)
{
struct genlmsghdr *genl = NLMSG_DATA(hdr);
struct nlattr *attr = GEN_NLA(genl);
uint32_t attrs_len = NLMSG_PAYLOAD(hdr, sizeof(struct genlmsghdr));
for (; NLA_OK(attr, attrs_len); attr = NLA_NEXT(attr, attrs_len)) {
switch (attr->nla_type) {
case CTRL_ATTR_FAMILY_ID:
nla_fmt(attr, "Family Id 0x%x", NLA_UINT16(attr));
break;
case CTRL_ATTR_FAMILY_NAME:
nla_fmt(attr, "Family Name %s", NLA_STR(attr));
break;
case CTRL_ATTR_VERSION:
nla_fmt(attr, "Version %u", NLA_UINT32(attr));
break;
case CTRL_ATTR_HDRSIZE:
nla_fmt(attr, "Header size %u", NLA_UINT32(attr));
break;
case CTRL_ATTR_MAXATTR:
nla_fmt(attr, "Max attr value 0x%x", NLA_UINT32(attr));
break;
default:
nla_fmt(attr, "0x%x", attr->nla_type);
break;
}
}
}
int connection_process(struct connection *conn, struct sk_buff *skb)
{
int ret = 0;
do {
if (mutex_lock_interruptible(&(conn->data_lock))) {
MCDRV_DBG_ERROR("Interrupted getting data semaphore!");
ret = -1;
break;
}
kfree_skb(conn->skb);
/* Get a reference to the incomming skb */
conn->skb = skb_get(skb);
if (conn->skb) {
conn->data_msg = nlmsg_hdr(conn->skb);
conn->data_len = NLMSG_PAYLOAD(conn->data_msg, 0);
conn->data_start = NLMSG_DATA(conn->data_msg);
up(&(conn->data_available_sem));
}
mutex_unlock(&(conn->data_lock));
ret = 0;
} while (0);
return ret;
}
static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *rep_buf;
struct nlmsghdr *rep_nlh;
struct nlmsghdr *req_nlh = info->nlhdr;
struct tipc_genlmsghdr *req_userhdr = info->userhdr;
int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN);
u16 cmd;
if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN)))
cmd = TIPC_CMD_NOT_NET_ADMIN;
else
cmd = req_userhdr->cmd;
rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd,
NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
hdr_space);
if (rep_buf) {
skb_push(rep_buf, hdr_space);
rep_nlh = nlmsg_hdr(rep_buf);
memcpy(rep_nlh, req_nlh, hdr_space);
rep_nlh->nlmsg_len = rep_buf->len;
genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).pid);
}
return 0;
}
static void handle_message(const struct nlmsghdr *message, ssize_t len)
{
uint8_t *payload;
ssize_t length;
struct nlattr *nlattr;
struct ifaddrmsg *ifaddr;
struct addrchange change;
if (!NLMSG_OK(message, len)) {
ERR("%s", "Got damaged message\n");
}
if (message->nlmsg_type != RTM_NEWADDR
&& message->nlmsg_type != RTM_DELADDR) {
INFO("%s", "Got unexpected message type");
return;
}
ifaddr = (struct ifaddrmsg *)NLMSG_DATA(message);
change.family = ifaddr->ifa_family;
change.action = message->nlmsg_type;
payload = (uint8_t *)(ifaddr + 1);
length = NLMSG_PAYLOAD(message, sizeof(struct ifaddrmsg));
for_each_nl(payload, nlattr, length) {
handle_attr(nlattr, &change);
}
static void
get_if_flags(struct nlmsghdr *nlm, int nlm_len, int request,
struct dhcp6_if *ifp)
{
struct ifinfomsg *ifim = (struct ifinfomsg *)NLMSG_DATA(nlm);
struct rtattr *rta, *rta1;
size_t rtasize, rtasize1, rtapayload;
void *rtadata;
dprintf(LOG_DEBUG, "get_if_flags called");
if (ifim->ifi_family != AF_INET6 || nlm->nlmsg_type != request)
return;
if (ifim->ifi_index != ifp->ifid)
return;
rtasize = NLMSG_PAYLOAD(nlm, nlm_len) - NLMSG_ALIGN(sizeof(*ifim));
for (rta = (struct rtattr *) (((char *) NLMSG_DATA(nlm)) +
NLMSG_ALIGN(sizeof(*ifim))); RTA_OK(rta, rtasize);
rta = RTA_NEXT(rta, rtasize)) {
rtadata = RTA_DATA(rta);
rtapayload = RTA_PAYLOAD(rta);
switch(rta->rta_type) {
case IFLA_IFNAME:
break;
#ifdef IFLA_PROTINFO
case IFLA_PROTINFO:
rtasize1 = rta->rta_len;
for (rta1 = (struct rtattr *)rtadata; RTA_OK(rta1, rtasize1);
rta1 = RTA_NEXT(rta1, rtasize1)) {
void *rtadata1 = RTA_DATA(rta1);
size_t rtapayload1= RTA_PAYLOAD(rta1);
switch(rta1->rta_type) {
case IFLA_INET6_CACHEINFO:
break;
case IFLA_INET6_FLAGS:
/* flags for IF_RA_MANAGED/IF_RA_OTHERCONF */
ifp->ra_flag = *((u_int32_t *)rtadata1);
if (*((u_int32_t *)rtadata1) & IF_RA_MANAGED)
dprintf(LOG_DEBUG,
"interface managed flags set");
if (*((u_int32_t *)rtadata1) & IF_RA_OTHERCONF)
dprintf(LOG_DEBUG,
"interface otherconf flags set");
break;
default:
break;
}
}
break;
#endif
default:
break;
}
}
return;
}
static void nl_link(struct nlmsghdr *nlmsg)
{
int la;
char ifname[IFNAMSIZ + 1];
struct rtattr *a;
struct ifinfomsg *i;
if (nlmsg->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) {
_e("Packet too small or truncated!");
return;
}
i = NLMSG_DATA(nlmsg);
a = (struct rtattr *)((char *)i + NLMSG_ALIGN(sizeof(struct ifinfomsg)));
la = NLMSG_PAYLOAD(nlmsg, sizeof(struct ifinfomsg));
while (RTA_OK(a, la)) {
if (a->rta_type == IFLA_IFNAME) {
strlcpy(ifname, RTA_DATA(a), sizeof(ifname));
switch (nlmsg->nlmsg_type) {
case RTM_NEWLINK:
/*
* New interface has appeared, or interface flags has changed.
* Check ifi_flags here to see if the interface is UP/DOWN
*/
_d("%s: New link, flags 0x%x, change 0x%x", ifname, i->ifi_flags, i->ifi_change);
net_cond_set(ifname, "exist", 1);
net_cond_set(ifname, "up", i->ifi_flags & IFF_UP);
net_cond_set(ifname, "running", i->ifi_flags & IFF_RUNNING);
break;
case RTM_DELLINK:
/* NOTE: Interface has disappeared, not link down ... */
_d("%s: Delete link", ifname);
net_cond_set(ifname, "exist", 0);
net_cond_set(ifname, "up", 0);
net_cond_set(ifname, "running", 0);
break;
case RTM_NEWADDR:
_d("%s: New Address", ifname);
break;
case RTM_DELADDR:
_d("%s: Deconfig Address", ifname);
break;
default:
_d("%s: Msg 0x%x", ifname, nlmsg->nlmsg_type);
break;
}
}
a = RTA_NEXT(a, la);
}
}
// recv(fd [, type=0])
static PyObject* py_nl_recv(PyObject *self, PyObject *args, PyObject *keywds)
{
int fd;
int ret;
unsigned char type = DEFAULT_RECV_TYPE;
char buf[MAX_NL_BUFSIZ];
PyObject *result = NULL;
unsigned char *data;
struct nlmsghdr *nlh;
static char *kwlist[] = {"fd", "type", NULL};
if (!PyArg_ParseTupleAndKeywords(args, keywds, "i|b", kwlist, &fd, &type)) {
return None();
//return NULL;
}
memset(buf, 0, MAX_NL_BUFSIZ);
ret = recvfrom(fd, buf, MAX_NL_BUFSIZ, 0, NULL, NULL);
if (ret < 0) {
return None();
}
nlh = (struct nlmsghdr *)buf;
data = (unsigned char *)NLMSG_DATA(nlh);
if (NLMSG_PAYLOAD(nlh, 0) <= 1) {
return None();
}
if (*data != type) {
return None();
}
result = Py_BuildValue("(s#kHHkk)", (char *)(data+1), (unsigned long)NLMSG_PAYLOAD(nlh, 0)-1,
(unsigned long)NLMSG_PAYLOAD(nlh, 0)-1, (unsigned short)(nlh->nlmsg_type),
(unsigned short)(nlh->nlmsg_flags), (unsigned long)(nlh->nlmsg_seq),
(unsigned long)(nlh->nlmsg_pid));
if (result)
return result;
return None();
}
//------------------------------------------------------------------------------
void NetlinkConnection::handleMessage(
struct nlmsghdr *nlh
) {
dataMutex.lock();
/* Takeover the buffer */
dataMsg = nlh;
dataLen = NLMSG_PAYLOAD(dataMsg, 0);
dataStart = static_cast<uint8_t *>(NLMSG_DATA(dataMsg));
dataMutex.unlock();
dataLeft.signal();
}
void parseBinaryNetLinkMessage(struct nlmsghdr *nlh)
{
int len = nlh->nlmsg_len - sizeof(*nlh);
struct ifinfomsg *ifi;
if(sizeof(*ifi) > (size_t)len){
printf("Got a short message\n");
return ;
}
ifi = (struct ifinfomsg*)NLMSG_DATA(nlh);
if((ifi->ifi_flags & IFF_LOOPBACK) != 0){
return ;
}
struct rtattr *rta = (struct rtattr*)
((char*)ifi + NLMSG_ALIGN(sizeof(*ifi)));
len = NLMSG_PAYLOAD(nlh,sizeof(*ifi));
while(RTA_OK(rta,len)){
switch(rta->rta_type){
case IFLA_IFNAME:
{
char ifname[IFNAMSIZ];
int up;
int id;
snprintf(ifname,sizeof(ifname),"%s",
(char*)RTA_DATA(rta));
up = (ifi->ifi_flags & IFF_RUNNING)? 1 : 0;
if (up && ((ifname[0] == 'p')&&(ifname[1] == 'p')&&
(ifname[2] == 'p'))){
printf("msg from:%s",ifname);
sscanf(ifname+3,"%d",&id);
if(nic_bitmap[id])
break;
start_capture(ifname);
nic_bitmap[id] = 1;
printf("%s %d\n",ifname,up);
}
if (!up && ((ifname[0] == 'p')&&(ifname[1] == 'p')&&
(ifname[2] == 'p'))){
sscanf(ifname+3,"%d",(int*)&id);
nic_bitmap[id] = 0;
printf("%s %d\n",ifname,up);
}
}
}
rta = RTA_NEXT(rta,len);
}
}
int sd_rtnl_message_rewind(sd_rtnl_message *m) {
const NLType *type;
unsigned i;
int r;
assert_return(m, -EINVAL);
/* don't allow appending to message once parsed */
if (!m->sealed)
rtnl_message_seal(m);
for (i = 1; i <= m->n_containers; i++) {
free(m->rta_offset_tb[i]);
m->rta_offset_tb[i] = NULL;
m->rta_tb_size[i] = 0;
m->container_type_system[i] = NULL;
}
m->n_containers = 0;
if (m->rta_offset_tb[0]) {
/* top-level attributes have already been parsed */
return 0;
}
assert(m->hdr);
r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type);
if (r < 0)
return r;
if (type->type == NLA_NESTED) {
const NLTypeSystem *type_system = type->type_system;
assert(type_system);
m->container_type_system[0] = type_system;
r = rtnl_message_parse(m,
&m->rta_offset_tb[m->n_containers],
&m->rta_tb_size[m->n_containers],
type_system->max,
(struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) +
NLMSG_ALIGN(type->size)),
NLMSG_PAYLOAD(m->hdr, type->size));
if (r < 0)
return r;
}
return 0;
}
int sd_netlink_message_rewind(sd_netlink_message *m) {
const NLType *nl_type;
uint16_t type;
size_t size;
unsigned i;
int r;
assert_return(m, -EINVAL);
/* don't allow appending to message once parsed */
if (!m->sealed)
rtnl_message_seal(m);
for (i = 1; i <= m->n_containers; i++)
m->containers[i].attributes = mfree(m->containers[i].attributes);
m->n_containers = 0;
if (m->containers[0].attributes)
/* top-level attributes have already been parsed */
return 0;
assert(m->hdr);
r = type_system_get_type(&type_system_root, &nl_type, m->hdr->nlmsg_type);
if (r < 0)
return r;
type = type_get_type(nl_type);
size = type_get_size(nl_type);
if (type == NETLINK_TYPE_NESTED) {
const NLTypeSystem *type_system;
type_get_type_system(nl_type, &type_system);
m->containers[0].type_system = type_system;
r = netlink_container_parse(m,
&m->containers[m->n_containers],
type_system_get_count(type_system),
(struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + NLMSG_ALIGN(size)),
NLMSG_PAYLOAD(m->hdr, size));
if (r < 0)
return r;
}
return 0;
}
/* return true if there is a known address with 'tentative' flag set */
static bool
virNetDevIPParseDadStatus(struct nlmsghdr *nlh, int len,
virSocketAddrPtr *addrs, size_t count)
{
struct ifaddrmsg *ifaddrmsg_ptr;
unsigned int ifaddrmsg_len;
struct rtattr *rtattr_ptr;
size_t i;
struct in6_addr *addr;
VIR_WARNINGS_NO_CAST_ALIGN
for (; NLMSG_OK(nlh, len); nlh = NLMSG_NEXT(nlh, len)) {
VIR_WARNINGS_RESET
if (NLMSG_PAYLOAD(nlh, 0) < sizeof(struct ifaddrmsg)) {
/* Message without payload is the last one. */
break;
}
ifaddrmsg_ptr = (struct ifaddrmsg *)NLMSG_DATA(nlh);
if (!(ifaddrmsg_ptr->ifa_flags & IFA_F_TENTATIVE)) {
/* Not tentative: we are not interested in this entry. */
continue;
}
ifaddrmsg_len = IFA_PAYLOAD(nlh);
VIR_WARNINGS_NO_CAST_ALIGN
rtattr_ptr = (struct rtattr *) IFA_RTA(ifaddrmsg_ptr);
for (; RTA_OK(rtattr_ptr, ifaddrmsg_len);
rtattr_ptr = RTA_NEXT(rtattr_ptr, ifaddrmsg_len)) {
VIR_WARNINGS_RESET
if (RTA_PAYLOAD(rtattr_ptr) != sizeof(struct in6_addr)) {
/* No address: ignore. */
continue;
}
/* We check only known addresses. */
for (i = 0; i < count; i++) {
addr = &addrs[i]->data.inet6.sin6_addr;
if (!memcmp(addr, RTA_DATA(rtattr_ptr),
sizeof(struct in6_addr))) {
/* We found matching tentative address. */
return true;
}
}
}
}
return false;
}
/*
* parse traffic control message
*/
int parse_tcamsg(struct nlmsghdr *nlh)
{
struct tcamsg *tcam;
int tcam_len;
struct rtattr *tcaa[TCAA_MAX+1];
char msg[MAX_MSG_SIZE] = "";
char *mp = msg;
int log_opts = get_log_opts();
/* debug nlmsghdr */
if(log_opts & L_DEBUG)
debug_nlmsg(0, nlh);
/* get tcamsg */
tcam_len = NLMSG_PAYLOAD(nlh, 0);
if(tcam_len < sizeof(*tcam)) {
rec_log("error: %s: length too short", __func__);
return(1);
}
tcam = (struct tcamsg *)NLMSG_DATA(nlh);
/* parse traffic control action message attributes */
parse_tca(tcaa, nlh);
/* debug tcamsg */
if(log_opts & L_DEBUG)
debug_tcamsg(0, tcam, tcaa, tcam_len);
/* kind of message */
switch(nlh->nlmsg_type) {
case RTM_NEWACTION:
mp = add_log(msg, mp, "tc action added: ");
break;
case RTM_DELACTION:
mp = add_log(msg, mp, "tc action deleted: ");
break;
default:
return(1);
}
if(tcaa[TCA_ACT_TAB])
if(parse_tca_acts(msg, mp, tcaa[TCA_ACT_TAB]))
return(1);
return(0);
}
static int nfct_parse_ct(nfct_msg *ctmsg, struct nlmsghdr *nlh)
{
struct nfgenmsg *nfmsg = (struct nfgenmsg *)NLMSG_DATA(nlh);
conn_entry *e;
struct nlattr *nla;
int len;
if(! instantiate(e))
return 0;
BZERO(e);
e->l3num = nfmsg->nfgen_family;
nla = (struct nlattr *)((char *)NLMSG_DATA(nlh) + NLMSG_ALIGN(sizeof(struct nfgenmsg)));
len = NLMSG_PAYLOAD(nlh, sizeof(struct nfgenmsg));
nla_parse(e->nla, CTA_MAX, nla, len);
if(e->nla[CTA_STATUS])
e->status = ntohl(nla_get_be32(e->nla[CTA_STATUS]));
ctmsg->entry = e;
return 0;
}
/*
* For routers, this is called from dn_fib_dump, but for endnodes its
* called directly from the rtnetlink dispatch table.
*/
int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct dn_route *rt;
int h, s_h;
int idx, s_idx;
if (NLMSG_PAYLOAD(cb->nlh, 0) < sizeof(struct rtmsg))
return -EINVAL;
if (!(((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED))
return 0;
s_h = cb->args[0];
s_idx = idx = cb->args[1];
for(h = 0; h <= dn_rt_hash_mask; h++) {
if (h < s_h)
continue;
if (h > s_h)
s_idx = 0;
rcu_read_lock_bh();
for(rt = rcu_dereference(dn_rt_hash_table[h].chain), idx = 0;
rt;
rt = rcu_dereference(rt->u.rt_next), idx++) {
if (idx < s_idx)
continue;
skb->dst = dst_clone(&rt->u.dst);
if (dn_rt_fill_info(skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, RTM_NEWROUTE,
1, NLM_F_MULTI) <= 0) {
dst_release(xchg(&skb->dst, NULL));
rcu_read_unlock_bh();
goto done;
}
dst_release(xchg(&skb->dst, NULL));
}
rcu_read_unlock_bh();
}
done:
cb->args[0] = h;
cb->args[1] = idx;
return skb->len;
}
static int
link_netlink(struct nlmsghdr *nlm, const char *ifname)
{
int len;
struct rtattr *rta;
struct ifinfomsg *ifi;
char ifn[IF_NAMESIZE + 1];
if (nlm->nlmsg_type != RTM_NEWLINK && nlm->nlmsg_type != RTM_DELLINK)
return 0;
len = nlm->nlmsg_len - sizeof(*nlm);
if ((size_t)len < sizeof(*ifi)) {
errno = EBADMSG;
return -1;
}
ifi = NLMSG_DATA(nlm);
if (ifi->ifi_flags & IFF_LOOPBACK)
return 0;
rta = (struct rtattr *) ((char *)ifi + NLMSG_ALIGN(sizeof(*ifi)));
len = NLMSG_PAYLOAD(nlm, sizeof(*ifi));
*ifn = '\0';
while (RTA_OK(rta, len)) {
switch (rta->rta_type) {
case IFLA_WIRELESS:
/* Ignore wireless messages */
if (nlm->nlmsg_type == RTM_NEWLINK &&
ifi->ifi_change == 0)
return 0;
break;
case IFLA_IFNAME:
strlcpy(ifn, RTA_DATA(rta), sizeof(ifn));
break;
}
rta = RTA_NEXT(rta, len);
}
if (strncmp(ifname, ifn, sizeof(ifn)) == 0)
return 1;
return 0;
}
void nsexec(void)
{
int pipenum;
// If we don't have init pipe, then just return to the go routine,
// we'll only have init pipe for start or exec
pipenum = get_init_pipe();
if (pipenum == -1) {
return;
}
// Retrieve the netlink header
struct nlmsghdr nl_msg_hdr;
int len;
if ((len = read(pipenum, &nl_msg_hdr, NLMSG_HDRLEN)) != NLMSG_HDRLEN) {
pr_perror("Invalid netlink header length %d", len);
exit(1);
}
if (nl_msg_hdr.nlmsg_type == NLMSG_ERROR) {
pr_perror("Failed to read netlink message");
exit(1);
}
if (nl_msg_hdr.nlmsg_type != INIT_MSG) {
pr_perror("Unexpected msg type %d", nl_msg_hdr.nlmsg_type);
exit(1);
}
// Retrieve data
int nl_total_size = NLMSG_PAYLOAD(&nl_msg_hdr, 0);
char data[nl_total_size];
if ((len = read(pipenum, data, nl_total_size)) != nl_total_size) {
pr_perror("Failed to read netlink payload, %d != %d", len,
nl_total_size);
exit(1);
}
jmp_buf env;
int syncpipe[2] = {-1, -1};
struct nsenter_config config = process_nl_attributes(pipenum,
data, nl_total_size);
// required clone_flags to be passed
if (config.cloneflags == -1) {
pr_perror("Missing clone_flags");
exit(1);
}
// prepare sync pipe between parent and child. We need this to let the
// child know that the parent has finished setting up
if (pipe(syncpipe) != 0) {
pr_perror("Failed to setup sync pipe between parent and child");
exit(1);
}
if (setjmp(env) == 1) {
// Child
uint8_t s = 0;
int consolefd = config.consolefd;
// close the writing side of pipe
close(syncpipe[1]);
// sync with parent
if ((read(syncpipe[0], &s, 1) != 1) || (s != 1)) {
pr_perror("Failed to read sync byte from parent");
exit(1);
}
if (setsid() == -1) {
pr_perror("setsid failed");
exit(1);
}
if (setuid(0) == -1) {
pr_perror("setuid failed");
exit(1);
}
if (setgid(0) == -1) {
pr_perror("setgid failed");
exit(1);
}
if (setgroups(0, NULL) == -1) {
pr_perror("setgroups failed");
exit(1);
}
if (consolefd != -1) {
if (ioctl(consolefd, TIOCSCTTY, 0) == -1) {
pr_perror("ioctl TIOCSCTTY failed");
exit(1);
}
if (dup3(consolefd, STDIN_FILENO, 0) != STDIN_FILENO) {
pr_perror("Failed to dup stdin");
exit(1);
}
if (dup3(consolefd, STDOUT_FILENO, 0) != STDOUT_FILENO) {
pr_perror("Failed to dup stdout");
exit(1);
}
if (dup3(consolefd, STDERR_FILENO, 0) != STDERR_FILENO) {
pr_perror("Failed to dup stderr");
exit(1);
}
}
// Finish executing, let the Go runtime take over.
return;
}
// Parent
start_child(pipenum, &env, syncpipe, &config);
}
static gboolean
read_netlink_messages (GSocket *socket,
GIOCondition condition,
gpointer user_data)
{
GNetworkMonitorNetlink *nl = user_data;
GInputVector iv;
gssize len;
GSocketControlMessage **cmsgs = NULL;
gint num_cmsgs = 0, i, flags;
GError *error = NULL;
GCredentials *creds;
uid_t sender;
struct nlmsghdr *msg;
struct rtmsg *rtmsg;
struct rtattr *attr;
gsize attrlen;
guint8 *dest, *gateway;
gboolean retval = TRUE;
iv.buffer = NULL;
iv.size = 0;
flags = MSG_PEEK | MSG_TRUNC;
len = g_socket_receive_message (nl->priv->sock, NULL, &iv, 1,
NULL, NULL, &flags, NULL, &error);
if (len < 0)
{
g_warning ("Error on netlink socket: %s", error->message);
g_error_free (error);
if (nl->priv->dump_networks)
finish_dump (nl);
return FALSE;
}
iv.buffer = g_malloc (len);
iv.size = len;
len = g_socket_receive_message (nl->priv->sock, NULL, &iv, 1,
&cmsgs, &num_cmsgs, NULL, NULL, &error);
if (len < 0)
{
g_warning ("Error on netlink socket: %s", error->message);
g_error_free (error);
if (nl->priv->dump_networks)
finish_dump (nl);
return FALSE;
}
if (num_cmsgs != 1 || !G_IS_UNIX_CREDENTIALS_MESSAGE (cmsgs[0]))
goto done;
creds = g_unix_credentials_message_get_credentials (G_UNIX_CREDENTIALS_MESSAGE (cmsgs[0]));
sender = g_credentials_get_unix_user (creds, NULL);
if (sender != 0)
goto done;
msg = (struct nlmsghdr *) iv.buffer;
for (; len > 0; msg = NLMSG_NEXT (msg, len))
{
if (!NLMSG_OK (msg, (size_t) len))
{
g_warning ("netlink message was truncated; shouldn't happen...");
retval = FALSE;
goto done;
}
switch (msg->nlmsg_type)
{
case RTM_NEWROUTE:
case RTM_DELROUTE:
rtmsg = NLMSG_DATA (msg);
if (rtmsg->rtm_family != AF_INET && rtmsg->rtm_family != AF_INET6)
continue;
if (rtmsg->rtm_type == RTN_UNREACHABLE)
continue;
attrlen = NLMSG_PAYLOAD (msg, sizeof (struct rtmsg));
attr = RTM_RTA (rtmsg);
dest = gateway = NULL;
while (RTA_OK (attr, attrlen))
{
if (attr->rta_type == RTA_DST)
dest = RTA_DATA (attr);
else if (attr->rta_type == RTA_GATEWAY)
gateway = RTA_DATA (attr);
attr = RTA_NEXT (attr, attrlen);
}
if (dest || gateway)
{
if (msg->nlmsg_type == RTM_NEWROUTE)
add_network (nl, rtmsg->rtm_family, rtmsg->rtm_dst_len, dest, gateway);
else
remove_network (nl, rtmsg->rtm_family, rtmsg->rtm_dst_len, dest, gateway);
queue_request_dump (nl);
}
break;
case NLMSG_DONE:
finish_dump (nl);
goto done;
case NLMSG_ERROR:
{
struct nlmsgerr *e = NLMSG_DATA (msg);
g_warning ("netlink error: %s", g_strerror (-e->error));
}
retval = FALSE;
goto done;
default:
g_warning ("unexpected netlink message %d", msg->nlmsg_type);
retval = FALSE;
goto done;
}
}
done:
for (i = 0; i < num_cmsgs; i++)
g_object_unref (cmsgs[i]);
g_free (cmsgs);
g_free (iv.buffer);
if (!retval && nl->priv->dump_networks)
finish_dump (nl);
return retval;
}
static void
get_if_prefix(struct nlmsghdr *nlm, int nlm_len, int request,
struct dhcp6_if *ifp)
{
struct rtmsg *rtm = (struct rtmsg *)NLMSG_DATA(nlm);
struct rtattr *rta;
size_t rtasize, rtapayload;
void *rtadata;
struct ra_info *rainfo;
char addr[64];
if (rtm->rtm_family != AF_INET6 || nlm->nlmsg_type != request)
return;
if (!(rtm->rtm_flags & RTM_F_PREFIX))
return;
rtasize = NLMSG_PAYLOAD(nlm, nlm_len) - NLMSG_ALIGN(sizeof(*rtm));
rta = (struct rtattr *) (((char *) NLMSG_DATA(nlm)) +
NLMSG_ALIGN(sizeof(*rtm)));
if (!RTA_OK(rta, rtasize))
return;
rtadata = RTA_DATA(rta);
rtapayload = RTA_PAYLOAD(rta);
switch(rta->rta_type) {
case RTA_OIF:
break;
default:
break;
}
switch (rta->rta_type) {
case RTA_DST:
rainfo = (struct ra_info *)malloc(sizeof(*rainfo));
if (rainfo == NULL)
return;
memset(rainfo, 0, sizeof(rainfo));
memcpy(&(rainfo->prefix), (struct in6_addr *)rtadata,
sizeof(struct in6_addr));
rainfo->plen = rtm->rtm_dst_len;
if (ifp->ralist == NULL) {
ifp->ralist = rainfo;
rainfo->next = NULL;
} else {
struct ra_info *ra, *ra_prev;
ra_prev = ifp->ralist;
for (ra = ifp->ralist; ra; ra = ra->next) {
if (rainfo->plen >= ra->plen) {
if (ra_prev == ra) {
ifp->ralist = rainfo;
rainfo->next = ra;
} else {
ra_prev->next = rainfo;
rainfo->next = ra;
}
break;
} else {
if (ra->next == NULL) {
ra->next = rainfo;
rainfo->next = NULL;
break;
} else {
ra_prev = ra;
continue;
}
}
}
}
inet_ntop(AF_INET6, &(rainfo->prefix), addr, INET6_ADDRSTRLEN);
dprintf(LOG_DEBUG, "get prefix address %s", addr);
dprintf(LOG_DEBUG, "get prefix plen %d",rtm->rtm_dst_len);
break;
case RTA_CACHEINFO:
dprintf(LOG_DEBUG, "prefix route life time is %d\n",
((struct rta_cacheinfo *)rtadata)->rta_expires);
break;
default:
break;
}
return;
}
/* ====================================================================== */
int getifaddrs(struct ifaddrs **ifap)
{
int sd;
struct nlmsg_list *nlmsg_list, *nlmsg_end, *nlm;
/* - - - - - - - - - - - - - - - */
int icnt;
size_t dlen, xlen, nlen;
uint32_t max_ifindex = 0;
pid_t pid = getpid();
int seq;
int result;
int build ; /* 0 or 1 */
/* ---------------------------------- */
/* initialize */
icnt = dlen = xlen = nlen = 0;
nlmsg_list = nlmsg_end = NULL;
if (ifap)
*ifap = NULL;
/* ---------------------------------- */
/* open socket and bind */
sd = nl_open();
if (sd < 0)
return -1;
/* ---------------------------------- */
/* gather info */
if ((seq = nl_getlist(sd, 0, RTM_GETLINK,
&nlmsg_list, &nlmsg_end)) < 0){
free_nlmsglist(nlmsg_list);
nl_close(sd);
return -1;
}
if ((seq = nl_getlist(sd, seq+1, RTM_GETADDR,
&nlmsg_list, &nlmsg_end)) < 0){
free_nlmsglist(nlmsg_list);
nl_close(sd);
return -1;
}
/* ---------------------------------- */
/* Estimate size of result buffer and fill it */
for (build=0; build<=1; build++){
struct ifaddrs *ifl = NULL, *ifa = NULL;
struct nlmsghdr *nlh, *nlh0;
void *data = NULL, *xdata = NULL, *ifdata = NULL;
char *ifname = NULL, **iflist = NULL;
uint16_t *ifflist = NULL;
struct rtmaddr_ifamap ifamap;
if (build){
ifa = data = calloc(1,
NLMSG_ALIGN(sizeof(struct ifaddrs[icnt]))
+ dlen + xlen + nlen);
ifdata = calloc(1,
NLMSG_ALIGN(sizeof(char *[max_ifindex+1]))
+ NLMSG_ALIGN(sizeof(uint16_t [max_ifindex+1])));
if (ifap != NULL)
*ifap = (ifdata != NULL) ? ifa : NULL;
else{
free_data(data, ifdata);
result = 0;
break;
}
if (data == NULL || ifdata == NULL){
free_data(data, ifdata);
result = -1;
break;
}
ifl = NULL;
data += NLMSG_ALIGN(sizeof(struct ifaddrs)) * icnt;
xdata = data + dlen;
ifname = xdata + xlen;
iflist = ifdata;
ifflist = ((void *)iflist) + NLMSG_ALIGN(sizeof(char *[max_ifindex+1]));
}
for (nlm=nlmsg_list; nlm; nlm=nlm->nlm_next){
int nlmlen = nlm->size;
if (!(nlh0 = nlm->nlh))
continue;
for (nlh = nlh0;
NLMSG_OK(nlh, nlmlen);
nlh=NLMSG_NEXT(nlh,nlmlen)){
struct ifinfomsg *ifim = NULL;
struct ifaddrmsg *ifam = NULL;
struct rtattr *rta;
size_t nlm_struct_size = 0;
sa_family_t nlm_family = 0;
uint32_t nlm_scope = 0, nlm_index = 0;
#ifndef IFA_NETMASK
size_t sockaddr_size = 0;
uint32_t nlm_prefixlen = 0;
#endif
size_t rtasize;
memset(&ifamap, 0, sizeof(ifamap));
/* check if the message is what we want */
if (nlh->nlmsg_pid != pid ||
nlh->nlmsg_seq != nlm->seq)
continue;
if (nlh->nlmsg_type == NLMSG_DONE){
break; /* ok */
}
switch (nlh->nlmsg_type){
case RTM_NEWLINK:
ifim = (struct ifinfomsg *)NLMSG_DATA(nlh);
nlm_struct_size = sizeof(*ifim);
nlm_family = ifim->ifi_family;
nlm_scope = 0;
nlm_index = ifim->ifi_index;
nlm_prefixlen = 0;
if (build)
ifflist[nlm_index] = ifa->ifa_flags = ifim->ifi_flags;
break;
case RTM_NEWADDR:
ifam = (struct ifaddrmsg *)NLMSG_DATA(nlh);
nlm_struct_size = sizeof(*ifam);
nlm_family = ifam->ifa_family;
nlm_scope = ifam->ifa_scope;
nlm_index = ifam->ifa_index;
nlm_prefixlen = ifam->ifa_prefixlen;
if (build)
ifa->ifa_flags = ifflist[nlm_index];
break;
default:
continue;
}
if (!build){
if (max_ifindex < nlm_index)
max_ifindex = nlm_index;
} else {
if (ifl != NULL)
ifl->ifa_next = ifa;
}
rtasize = NLMSG_PAYLOAD(nlh, nlmlen) - NLMSG_ALIGN(nlm_struct_size);
for (rta = (struct rtattr *)(((char *)NLMSG_DATA(nlh)) + NLMSG_ALIGN(nlm_struct_size));
RTA_OK(rta, rtasize);
rta = RTA_NEXT(rta, rtasize)){
struct sockaddr **sap = NULL;
void *rtadata = RTA_DATA(rta);
size_t rtapayload = RTA_PAYLOAD(rta);
socklen_t sa_len;
switch(nlh->nlmsg_type){
case RTM_NEWLINK:
switch(rta->rta_type){
case IFLA_ADDRESS:
case IFLA_BROADCAST:
if (build){
sap = (rta->rta_type == IFLA_ADDRESS) ? &ifa->ifa_addr : &ifa->ifa_broadaddr;
*sap = (struct sockaddr *)data;
}
sa_len = ifa_sa_len(AF_PACKET, rtapayload);
if (rta->rta_type == IFLA_ADDRESS)
sockaddr_size = NLMSG_ALIGN(sa_len);
if (!build){
dlen += NLMSG_ALIGN(sa_len);
} else {
memset(*sap, 0, sa_len);
ifa_make_sockaddr(AF_PACKET, *sap, rtadata,rtapayload, 0,0);
((struct sockaddr_ll *)*sap)->sll_ifindex = nlm_index;
((struct sockaddr_ll *)*sap)->sll_hatype = ifim->ifi_type;
data += NLMSG_ALIGN(sa_len);
}
break;
case IFLA_IFNAME:/* Name of Interface */
if (!build)
nlen += NLMSG_ALIGN(rtapayload + 1);
else{
ifa->ifa_name = ifname;
if (iflist[nlm_index] == NULL)
iflist[nlm_index] = ifa->ifa_name;
strncpy(ifa->ifa_name, rtadata, rtapayload);
ifa->ifa_name[rtapayload] = '\0';
ifname += NLMSG_ALIGN(rtapayload + 1);
}
break;
case IFLA_STATS:/* Statistics of Interface */
if (!build)
xlen += NLMSG_ALIGN(rtapayload);
else{
ifa->ifa_data = xdata;
memcpy(ifa->ifa_data, rtadata, rtapayload);
xdata += NLMSG_ALIGN(rtapayload);
}
break;
case IFLA_UNSPEC:
break;
case IFLA_MTU:
break;
case IFLA_LINK:
break;
case IFLA_QDISC:
break;
}
break;
case RTM_NEWADDR:
if (nlm_family == AF_PACKET) break;
switch(rta->rta_type){
case IFA_ADDRESS:
ifamap.address = rtadata;
ifamap.address_len = rtapayload;
break;
case IFA_LOCAL:
ifamap.local = rtadata;
ifamap.local_len = rtapayload;
break;
case IFA_BROADCAST:
ifamap.broadcast = rtadata;
ifamap.broadcast_len = rtapayload;
break;
#ifdef HAVE_IFADDRS_IFA_ANYCAST
case IFA_ANYCAST:
ifamap.anycast = rtadata;
ifamap.anycast_len = rtapayload;
break;
#endif
case IFA_LABEL:
if (!build)
nlen += NLMSG_ALIGN(rtapayload + 1);
else{
ifa->ifa_name = ifname;
if (iflist[nlm_index] == NULL)
iflist[nlm_index] = ifname;
strncpy(ifa->ifa_name, rtadata, rtapayload);
ifa->ifa_name[rtapayload] = '\0';
ifname += NLMSG_ALIGN(rtapayload + 1);
}
break;
case IFA_UNSPEC:
break;
case IFA_CACHEINFO:
break;
}
}
}
if (nlh->nlmsg_type == RTM_NEWADDR &&
nlm_family != AF_PACKET) {
if (!ifamap.local) {
ifamap.local = ifamap.address;
ifamap.local_len = ifamap.address_len;
}
if (!ifamap.address) {
ifamap.address = ifamap.local;
ifamap.address_len = ifamap.local_len;
}
if (ifamap.address_len != ifamap.local_len ||
(ifamap.address != NULL &&
memcmp(ifamap.address, ifamap.local, ifamap.address_len))) {
/* p2p; address is peer and local is ours */
ifamap.broadcast = ifamap.address;
ifamap.broadcast_len = ifamap.address_len;
ifamap.address = ifamap.local;
ifamap.address_len = ifamap.local_len;
}
if (ifamap.address) {
#ifndef IFA_NETMASK
sockaddr_size = NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.address_len));
#endif
if (!build)
dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.address_len));
else {
ifa->ifa_addr = (struct sockaddr *)data;
ifa_make_sockaddr(nlm_family, ifa->ifa_addr, ifamap.address, ifamap.address_len,
nlm_scope, nlm_index);
data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.address_len));
}
}
#ifdef IFA_NETMASK
if (ifamap.netmask) {
if (!build)
dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.netmask_len));
else {
ifa->ifa_netmask = (struct sockaddr *)data;
ifa_make_sockaddr(nlm_family, ifa->ifa_netmask, ifamap.netmask, ifamap.netmask_len,
nlm_scope, nlm_index);
data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.netmask_len));
}
}
#endif
if (ifamap.broadcast) {
if (!build)
dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.broadcast_len));
else {
ifa->ifa_broadaddr = (struct sockaddr *)data;
ifa_make_sockaddr(nlm_family, ifa->ifa_broadaddr, ifamap.broadcast, ifamap.broadcast_len,
nlm_scope, nlm_index);
data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.broadcast_len));
}
}
#ifdef HAVE_IFADDRS_IFA_ANYCAST
if (ifamap.anycast) {
if (!build)
dlen += NLMSG_ALIGN(ifa_sa_len(nlm_family,ifamap.anycast_len));
else {
ifa->ifa_anycast = (struct sockaddr *)data;
ifa_make_sockaddr(nlm_family, ifa->ifa_anyaddr, ifamap.anycast, ifamap.anycast_len,
nlm_scope, nlm_index);
data += NLMSG_ALIGN(ifa_sa_len(nlm_family, ifamap.anycast_len));
}
}
#endif
}
if (!build){
#ifndef IFA_NETMASK
dlen += sockaddr_size;
#endif
icnt++;
} else {
if (ifa->ifa_name == NULL)
ifa->ifa_name = iflist[nlm_index];
#ifndef IFA_NETMASK
if (ifa->ifa_addr &&
ifa->ifa_addr->sa_family != AF_UNSPEC &&
ifa->ifa_addr->sa_family != AF_PACKET){
ifa->ifa_netmask = (struct sockaddr *)data;
ifa_make_sockaddr_mask(ifa->ifa_addr->sa_family, ifa->ifa_netmask, nlm_prefixlen);
}
data += sockaddr_size;
#endif
ifl = ifa++;
}
}
}
if (!build){
if (icnt == 0 && (dlen + nlen + xlen == 0)){
if (ifap != NULL)
*ifap = NULL;
break; /* cannot found any addresses */
}
}
else
free_data(NULL, ifdata);
}
/* ---------------------------------- */
/* Finalize */
free_nlmsglist(nlmsg_list);
nl_close(sd);
return 0;
}
static int interpretLink(struct nlmsghdr *p_hdr, struct ifaddrs **p_resultList)
{
struct ifinfomsg *l_info = (struct ifinfomsg *)NLMSG_DATA(p_hdr);
size_t l_nameSize = 0;
size_t l_addrSize = 0;
size_t l_dataSize = 0;
size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
struct rtattr *l_rta;
for(l_rta = IFLA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFLA_ADDRESS:
case IFLA_BROADCAST:
l_addrSize += NLMSG_ALIGN(calcAddrLen(AF_PACKET, l_rtaDataSize));
break;
case IFLA_IFNAME:
l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
break;
case IFLA_STATS:
l_dataSize += NLMSG_ALIGN(l_rtaSize);
break;
default:
break;
}
}
struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + sizeof(int) + l_nameSize + l_addrSize + l_dataSize);
if (l_entry == NULL)
{
return -1;
}
memset(l_entry, 0, sizeof(struct ifaddrs));
l_entry->ifa_name = "";
char *l_index = ((char *)l_entry) + sizeof(struct ifaddrs);
char *l_name = l_index + sizeof(int);
char *l_addr = l_name + l_nameSize;
char *l_data = l_addr + l_addrSize;
// save the interface index so we can look it up when handling the addresses.
memcpy(l_index, &l_info->ifi_index, sizeof(int));
l_entry->ifa_flags = l_info->ifi_flags;
l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
for(l_rta = IFLA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
void *l_rtaData = RTA_DATA(l_rta);
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFLA_ADDRESS:
case IFLA_BROADCAST:
{
size_t l_addrLen = calcAddrLen(AF_PACKET, l_rtaDataSize);
makeSockaddr(AF_PACKET, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
((struct sockaddr_ll *)l_addr)->sll_ifindex = l_info->ifi_index;
((struct sockaddr_ll *)l_addr)->sll_hatype = l_info->ifi_type;
if(l_rta->rta_type == IFLA_ADDRESS)
{
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
}
l_addr += NLMSG_ALIGN(l_addrLen);
break;
}
case IFLA_IFNAME:
strncpy(l_name, l_rtaData, l_rtaDataSize);
l_name[l_rtaDataSize] = '\0';
l_entry->ifa_name = l_name;
break;
case IFLA_STATS:
memcpy(l_data, l_rtaData, l_rtaDataSize);
l_entry->ifa_data = l_data;
break;
default:
break;
}
}
addToEnd(p_resultList, l_entry);
return 0;
}
static int interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_resultList, int p_numLinks)
{
struct ifaddrmsg *l_info = (struct ifaddrmsg *)NLMSG_DATA(p_hdr);
struct ifaddrs *l_interface = findInterface(l_info->ifa_index, p_resultList, p_numLinks);
if(l_info->ifa_family == AF_PACKET)
{
return 0;
}
size_t l_nameSize = 0;
size_t l_addrSize = 0;
int l_addedNetmask = 0;
size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
struct rtattr *l_rta;
for(l_rta = IFA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFA_ADDRESS:
case IFA_LOCAL:
if((l_info->ifa_family == AF_INET || l_info->ifa_family == AF_INET6) && !l_addedNetmask)
{ // make room for netmask
l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
l_addedNetmask = 1;
}
case IFA_BROADCAST:
l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
break;
case IFA_LABEL:
l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
break;
default:
break;
}
}
struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize);
if (l_entry == NULL)
{
return -1;
}
memset(l_entry, 0, sizeof(struct ifaddrs));
l_entry->ifa_name = (l_interface ? l_interface->ifa_name : "");
char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
char *l_addr = l_name + l_nameSize;
l_entry->ifa_flags = l_info->ifa_flags;
if(l_interface)
{
l_entry->ifa_flags |= l_interface->ifa_flags;
}
l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
for(l_rta = IFA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
{
void *l_rtaData = RTA_DATA(l_rta);
size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
switch(l_rta->rta_type)
{
case IFA_ADDRESS:
case IFA_BROADCAST:
case IFA_LOCAL:
{
size_t l_addrLen = calcAddrLen(l_info->ifa_family, l_rtaDataSize);
makeSockaddr(l_info->ifa_family, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
if(l_info->ifa_family == AF_INET6)
{
if(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)l_rtaData) || IN6_IS_ADDR_MC_LINKLOCAL((struct in6_addr *)l_rtaData))
{
((struct sockaddr_in6 *)l_addr)->sin6_scope_id = l_info->ifa_index;
}
}
if(l_rta->rta_type == IFA_ADDRESS)
{ // apparently in a point-to-point network IFA_ADDRESS contains the dest address and IFA_LOCAL contains the local address
if(l_entry->ifa_addr)
{
l_entry->ifa_dstaddr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
}
else if(l_rta->rta_type == IFA_LOCAL)
{
if(l_entry->ifa_addr)
{
l_entry->ifa_dstaddr = l_entry->ifa_addr;
}
l_entry->ifa_addr = (struct sockaddr *)l_addr;
}
else
{
l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
}
l_addr += NLMSG_ALIGN(l_addrLen);
break;
}
case IFA_LABEL:
strncpy(l_name, l_rtaData, l_rtaDataSize);
l_name[l_rtaDataSize] = '\0';
l_entry->ifa_name = l_name;
break;
default:
break;
}
}
if(l_entry->ifa_addr && (l_entry->ifa_addr->sa_family == AF_INET || l_entry->ifa_addr->sa_family == AF_INET6))
{
unsigned l_maxPrefix = (l_entry->ifa_addr->sa_family == AF_INET ? 32 : 128);
unsigned l_prefix = (l_info->ifa_prefixlen > l_maxPrefix ? l_maxPrefix : l_info->ifa_prefixlen);
char l_mask[16] = {0};
unsigned i;
for(i=0; i<(l_prefix/8); ++i)
{
l_mask[i] = 0xff;
}
if(l_prefix % 8)
{
l_mask[i] = 0xff << (8 - (l_prefix % 8));
}
makeSockaddr(l_entry->ifa_addr->sa_family, (struct sockaddr *)l_addr, l_mask, l_maxPrefix / 8);
l_entry->ifa_netmask = (struct sockaddr *)l_addr;
}
addToEnd(p_resultList, l_entry);
return 0;
}
static int process_nlmsg(struct nlmsghdr *n) {
assert(n);
if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
/* A link appeared or was removed */
struct ifinfomsg *ifi;
ifi = NLMSG_DATA(n);
if (ifi->ifi_family != AF_UNSPEC || (int) ifi->ifi_index != ifindex)
return 0;
if (n->nlmsg_type == RTM_DELLINK) {
daemon_log(LOG_ERR, "Interface vanished.");
return -1;
}
assert(n->nlmsg_type == RTM_NEWLINK);
if ((ifi->ifi_flags & IFF_LOOPBACK) ||
(ifi->ifi_flags & IFF_NOARP) ||
ifi->ifi_type != ARPHRD_ETHER) {
daemon_log(LOG_ERR, "Interface not suitable.");
return -1;
}
} else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
/* An address was added or removed */
struct rtattr *a = NULL;
struct ifaddrmsg *ifa;
int l;
uint32_t address = 0;
Address *i;
ifa = NLMSG_DATA(n);
if (ifa->ifa_family != AF_INET || (int) ifa->ifa_index != ifindex)
return 0;
l = NLMSG_PAYLOAD(n, sizeof(*ifa));
a = IFLA_RTA(ifa);
while(RTA_OK(a, l)) {
switch(a->rta_type) {
case IFA_LOCAL:
case IFA_ADDRESS:
assert(RTA_PAYLOAD(a) == 4);
memcpy(&address, RTA_DATA(a), sizeof(uint32_t));
break;
}
a = RTA_NEXT(a, l);
}
if (!address || is_ll_address(address))
return 0;
for (i = addresses; i; i = i->addresses_next)
if (i->address == address)
break;
if (n->nlmsg_type == RTM_DELADDR && i) {
AVAHI_LLIST_REMOVE(Address, addresses, addresses, i);
avahi_free(i);
} if (n->nlmsg_type == RTM_NEWADDR && !i) {
i = avahi_new(Address, 1);
i->address = address;
AVAHI_LLIST_PREPEND(Address, addresses, addresses, i);
}
}
return 0;
}
// Detect an IPV6-address currently assigned to the given interface
ssize_t relayd_get_interface_addresses(int ifindex,
struct relayd_ipaddr *addrs, size_t cnt)
{
struct {
struct nlmsghdr nhm;
struct ifaddrmsg ifa;
} req = {{sizeof(req), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
++rtnl_seq, 0}, {AF_INET6, 0, 0, 0, ifindex}};
if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req))
return 0;
uint8_t buf[8192];
ssize_t len = 0, ret = 0;
for (struct nlmsghdr *nhm = NULL; ; nhm = NLMSG_NEXT(nhm, len)) {
while (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
len = recv(rtnl_socket, buf, sizeof(buf), 0);
nhm = (struct nlmsghdr*)buf;
if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
if (errno == EINTR)
continue;
else
return ret;
}
}
if (nhm->nlmsg_type != RTM_NEWADDR)
break;
// Skip address but keep clearing socket buffer
if (ret >= (ssize_t)cnt)
continue;
struct ifaddrmsg *ifa = NLMSG_DATA(nhm);
if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
ifa->ifa_index != (unsigned)ifindex)
continue;
struct rtattr *rta = (struct rtattr*)&ifa[1];
size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ifa));
memset(&addrs[ret], 0, sizeof(addrs[ret]));
addrs[ret].prefix = ifa->ifa_prefixlen;
while (RTA_OK(rta, alen)) {
if (rta->rta_type == IFA_ADDRESS) {
memcpy(&addrs[ret].addr, RTA_DATA(rta),
sizeof(struct in6_addr));
} else if (rta->rta_type == IFA_CACHEINFO) {
struct ifa_cacheinfo *ifc = RTA_DATA(rta);
addrs[ret].preferred = ifc->ifa_prefered;
addrs[ret].valid = ifc->ifa_valid;
}
rta = RTA_NEXT(rta, alen);
}
if (ifa->ifa_flags & IFA_F_DEPRECATED)
addrs[ret].preferred = 0;
++ret;
}
return ret;
}
/*
* parse traffic control filter messages
*/
int parse_tcmsg_filter(struct nlmsghdr *nlh)
{
struct tcmsg *tcm;
int tcm_len;
struct rtattr *tca[__TCA_MAX];
char msg[MAX_MSG_SIZE] = "";
char *mp = msg;
char ifname[IFNAMSIZ];
char handle[MAX_STR_SIZE] = "";
char kind[IFNAMSIZ] = "(unknown)";
char proto[MAX_STR_SIZE];
int log_opts = get_log_opts();
/* debug nlmsghdr */
if(log_opts & L_DEBUG)
debug_nlmsg(0, nlh);
/* get tcmsg */
tcm_len = NLMSG_PAYLOAD(nlh, 0);
if(tcm_len < sizeof(*tcm)) {
rec_log("error: %s: tcmsg: length too short", __func__);
return(1);
}
tcm = (struct tcmsg *)NLMSG_DATA(nlh);
/* parse traffic control message attributes */
parse_tc(tca, nlh);
/* debug tcmsg */
if(log_opts & L_DEBUG)
debug_tcmsg(0, nlh, tcm, tca, tcm_len);
/* kind of message */
switch(nlh->nlmsg_type) {
case RTM_NEWTFILTER:
mp = add_log(msg, mp, "tc filter added: ");
break;
case RTM_DELTFILTER:
mp = add_log(msg, mp, "tc filter deleted: ");
break;
default:
rec_log("error: %s: nlmsg_type: unknown message", __func__);
return(1);
}
/* get interface name */
if_indextoname_from_lists(tcm->tcm_ifindex, ifname);
mp = add_log(msg, mp, "interface=%s ", ifname);
/* get qdisc kind */
if(tca[TCA_KIND])
strncpy(kind, (char *)RTA_DATA(tca[TCA_KIND]), sizeof(kind));
/* get filter handle */
if(!strncmp(kind, "u32", sizeof(kind)))
parse_u32_handle(handle, sizeof(handle), tcm->tcm_handle);
else
snprintf(handle, sizeof(handle), "0x%x", tcm->tcm_handle);
mp = add_log(msg, mp, "handle=%s ", handle);
/* get priority */
mp = add_log(msg, mp, "priority=%u ", TC_H_MAJ(tcm->tcm_info)>>16);
/* get priority */
strncpy(proto, conv_eth_p(ntohs(TC_H_MIN(tcm->tcm_info)), 0), sizeof(proto));
if(strlen(proto))
mp = add_log(msg, mp, "protocol=%s ", proto);
else
mp = add_log(msg, mp, "protocol=0x%04x ", ntohs(TC_H_MIN(tcm->tcm_info)));
/* get filter options */
mp = add_log(msg, mp, "filter=%s ", kind);
if(tca[TCA_OPTIONS]) {
if(!strncmp(kind, "u32", sizeof(kind))) {
if(parse_tca_options_u32(msg, &mp, tca[TCA_OPTIONS]))
return(1);
return(0);
} else if(!strncmp(kind, "rsvp", sizeof(kind))) {
if(parse_tca_options_rsvp(msg, &mp, tcm, tca[TCA_OPTIONS]))
return(1);
return(0);
} else if(!strncmp(kind, "route", sizeof(kind))) {
if(parse_tca_options_route(msg, &mp, tca[TCA_OPTIONS]))
return(1);
return(0);
} else if(!strncmp(kind, "fw", sizeof(kind))) {
if(parse_tca_options_fw(msg, &mp, tca[TCA_OPTIONS]))
return(1);
return(0);
} else if(!strncmp(kind, "tcindex", sizeof(kind))) {
if(parse_tca_options_tcindex(msg, &mp, tca[TCA_OPTIONS]))
return(1);
return(0);
#if HAVE_DECL_TCA_FLOW_UNSPEC
} else if(!strncmp(kind, "flow", sizeof(kind))) {
if(parse_tca_options_flow(msg, &mp, tca[TCA_OPTIONS]))
return(1);
return(0);
#endif
} else if(!strncmp(kind, "basic", sizeof(kind))) {
if(parse_tca_options_basic(msg, &mp, tca[TCA_OPTIONS]))
return(1);
return(0);
#if HAVE_DECL_TCA_CGROUP_UNSPEC
} else if(!strncmp(kind, "cgroup", sizeof(kind))) {
if(parse_tca_options_cgroup(msg, &mp, tca[TCA_OPTIONS]))
return(1);
return(0);
#endif
}
}
rec_log("%s", msg);
return(0);
}
/**
*
* void nl_data_ready(struct sk_buff *skb)
*
* This function is automatically called when the kernel receives a datagram on the corresponding netlink socket.
*/
void nl_data_ready(struct sk_buff *skb) {
static int message_counter=0;
message_counter++;
struct nlmsghdr *nlh;
u_char *buffer; // Pointer to data in payload
u_char *buf;
// strcat(buffer, "LOLOLOLOLOLO");
int len; // Payload length
int commandValueLength;
u_char *commandValue;
int pid; // pid of sending process
struct nl_userspace80211_to_stub80211_msg *messageToParse;
u_int reply_call; // a number corresponding to the type of socketcall this packet is in response to
PRINT_DEBUG("Entered: skb=%p", skb);
if (skb == NULL) {
PRINT_DEBUG("Exiting: skb NULL \n");
return;
}
nlh = (struct nlmsghdr *) skb->data;
pid = nlh->nlmsg_pid; // get pid from the header
// Get a pointer to the start of the data in the buffer and the buffer (payload) length
buf = (u_char *) (NLMSG_DATA(nlh));
len = NLMSG_PAYLOAD(nlh, 0);
PRINT_DEBUG("Core Process ID nl_pid=%d,Payload Length nl_len=%d", pid, len);
// **** Remember the LKM must be up first, then the daemon,
// but the daemon must make contact before any applications try to use socket()
if (pid == -1) { // if the socket daemon hasn't made contact before
// Print what we received
PRINT_DEBUG("No msg pID, received='%p'", buf);
} else {
/** if (len >= sizeof(struct nl_FINS_to_stub80211)) {
hdr = (struct nl_FINS_to_stub80211 *) buf;
len -= sizeof(struct nl_FINS_to_stub80211);
*/
if (len >= sizeof(struct nl_userspace80211_to_stub80211_msg )) {
messageToParse = (struct nl_userspace80211_to_stub80211_msg *) buf;
commandValueLength = len - sizeof (struct nl_userspace80211_to_stub80211_msg);
if (messageToParse->commandValueLength != messageToParse->commandValueLength )
PRINT_ERROR("THIS IS FATAL PROBLEM. length calcualted, does not equal"
"length in the structure");
PRINT_DEBUG("Received Message number = %d call_type=%d, call_valueLength=%d, call_valuePointer=%c",
message_counter,messageToParse->command_type, messageToParse->commandValueLength, messageToParse->value);
if ( (messageToParse->commandValueLength ==0) &&
(messageToParse->commandValueLength == messageToParse->commandValueLength ))
{
switch (messageToParse->command_type)
{
case STUB80211_CMD_SPECS:
PRINT_DEBUG("STUB80211_CMD_SPECS:");
break;
case STUB80211_CMD_GETRATE:
PRINT_DEBUG("STUB80211_CMD_GETRATE:");
break;
case STUB80211_CMD_SETRATE:
PRINT_DEBUG("STUB80211_CMD_SETRATE::");
break;
case STUB80211_CMD_GETTXPOWER:
PRINT_DEBUG("STUB80211_CMD_GETTXPOWER:::");
break;
case STUB80211_CMD_SETTXPOWER:
PRINT_DEBUG("STUB80211_CMD_SETTXPOWER:::");
break;
case STUB80211_CMD_GETCW:
PRINT_DEBUG("STUB80211_CMD_GETCW:::");
break;
case STUB80211_CMD_SETCW:
PRINT_DEBUG("STUB80211_CMD_SETCW:::");
break;
case STUB80211_CMD_GETCWMIN:
PRINT_DEBUG("STUB80211_CMD_GETCWMIN:::");
break;
case STUB80211_CMD_SETCWMIN:
PRINT_DEBUG("STUB80211_CMD_SETCWMIN:::");
break;
case STUB80211_CMD_GETCWMAX:
PRINT_DEBUG("STUB80211_CMD_GETCWMAX:::");
break;
case STUB80211_CMD_SETCWMAX:
PRINT_DEBUG("STUB80211_CMD_SETCWMAX:::");
break;
case STUB80211_CMD_GETRSS:
PRINT_DEBUG("STUB80211_CMD_GETRSS:::");
break;
case STUB80211_CMD_GETSTAT:
PRINT_DEBUG("STUB80211_CMD_GETSTAT:::");
struct ieee80211_low_level_stats toBeCopied;
toBeCopied =
break;
default:
PRINT_DEBUG("Command type is not found");
}
}
else if (messageToParse->commandValueLength !=0)
{
PRINT_DEBUG("commandValueLength is not zero");
commandValue = (u_char *) kmalloc(commandValueLength , GFP_KERNEL);
if (commandValue == NULL) {
PRINT_ERROR("buffer allocation error");
return;
}
memcpy(commandValue, messageToParse->value, commandValueLength);
}
else
{
PRINT_DEBUG("\nERROR- should not enter here ever");
}
/**
* In this segment of code , we parse the message received from the userspace:
* According to the list of commands defined between the stub80211 LKM and
* the stub80211 userspace thread
*
*/
} //end of IF
/*
* Parse a binary message from a NETLINK_ROUTE netlink socket.
*/
bool NetlinkEvent::parseBinaryNetlinkMessage(char *buffer, int size) {
const struct nlmsghdr *nh;
for (nh = (struct nlmsghdr *) buffer;
NLMSG_OK(nh, (unsigned) size) && (nh->nlmsg_type != NLMSG_DONE);
nh = NLMSG_NEXT(nh, size)) {
if (nh->nlmsg_type == RTM_NEWLINK) {
int len = nh->nlmsg_len - sizeof(*nh);
struct ifinfomsg *ifi;
if (sizeof(*ifi) > (size_t) len) {
SLOGE("Got a short RTM_NEWLINK message\n");
continue;
}
ifi = (ifinfomsg *)NLMSG_DATA(nh);
if ((ifi->ifi_flags & IFF_LOOPBACK) != 0) {
continue;
}
struct rtattr *rta = (struct rtattr *)
((char *) ifi + NLMSG_ALIGN(sizeof(*ifi)));
len = NLMSG_PAYLOAD(nh, sizeof(*ifi));
while(RTA_OK(rta, len)) {
switch(rta->rta_type) {
case IFLA_IFNAME:
char buffer[16 + IFNAMSIZ];
snprintf(buffer, sizeof(buffer), "INTERFACE=%s",
(char *) RTA_DATA(rta));
mParams[0] = strdup(buffer);
mAction = (ifi->ifi_flags & IFF_LOWER_UP) ?
NlActionLinkUp : NlActionLinkDown;
mSubsystem = strdup("net");
break;
}
rta = RTA_NEXT(rta, len);
}
} else if (nh->nlmsg_type == QLOG_NL_EVENT) {
char *devname;
ulog_packet_msg_t *pm;
size_t len = nh->nlmsg_len - sizeof(*nh);
if (sizeof(*pm) > len) {
SLOGE("Got a short QLOG message\n");
continue;
}
pm = (ulog_packet_msg_t *)NLMSG_DATA(nh);
devname = pm->indev_name[0] ? pm->indev_name : pm->outdev_name;
asprintf(&mParams[0], "ALERT_NAME=%s", pm->prefix);
asprintf(&mParams[1], "INTERFACE=%s", devname);
mSubsystem = strdup("qlog");
mAction = NlActionChange;
} else if (nh->nlmsg_type == RTM_NEWADDR ||
nh->nlmsg_type == RTM_DELADDR) {
int len = nh->nlmsg_len - sizeof(*nh);
struct ifaddrmsg *ifa;
if (sizeof(*ifa) > (size_t) len) {
SLOGE("Got a short RTM_xxxADDR message\n");
continue;
}
ifa = (ifaddrmsg *)NLMSG_DATA(nh);
size_t rtasize = IFA_PAYLOAD(nh);
if (!parseIfAddrMessage(nh->nlmsg_type, ifa, rtasize)) {
continue;
}
} else if (nh->nlmsg_type == RTM_NEWNDUSEROPT) {
int len = nh->nlmsg_len - sizeof(*nh);
struct nduseroptmsg *ndmsg = (struct nduseroptmsg *) NLMSG_DATA(nh);
if (sizeof(*ndmsg) > (size_t) len) {
SLOGE("Got a short RTM_NEWNDUSEROPT message\n");
continue;
}
size_t optsize = NLMSG_PAYLOAD(nh, sizeof(*ndmsg));
if (!parseNdUserOptMessage(ndmsg, optsize)) {
continue;
}
} else {
SLOGD("Unexpected netlink message. type=0x%x\n",
nh->nlmsg_type);
}
}
return true;
}
int print_netconf(const struct sockaddr_nl *who, struct rtnl_ctrl_data *ctrl,
struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
struct netconfmsg *ncm = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[NETCONFA_MAX+1];
int ifindex = 0;
if (n->nlmsg_type == NLMSG_ERROR)
return -1;
if (n->nlmsg_type != RTM_NEWNETCONF) {
fprintf(stderr, "Not RTM_NEWNETCONF: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return -1;
}
len -= NLMSG_SPACE(sizeof(*ncm));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (filter.family && filter.family != ncm->ncm_family)
return 0;
parse_rtattr(tb, NETCONFA_MAX, netconf_rta(ncm),
NLMSG_PAYLOAD(n, sizeof(*ncm)));
if (tb[NETCONFA_IFINDEX])
ifindex = rta_getattr_u32(tb[NETCONFA_IFINDEX]);
if (filter.ifindex && filter.ifindex != ifindex)
return 0;
switch (ncm->ncm_family) {
case AF_INET:
fprintf(fp, "ipv4 ");
break;
case AF_INET6:
fprintf(fp, "ipv6 ");
break;
case AF_MPLS:
fprintf(fp, "mpls ");
break;
default:
fprintf(fp, "unknown ");
break;
}
if (tb[NETCONFA_IFINDEX]) {
switch (ifindex) {
case NETCONFA_IFINDEX_ALL:
fprintf(fp, "all ");
break;
case NETCONFA_IFINDEX_DEFAULT:
fprintf(fp, "default ");
break;
default:
fprintf(fp, "dev %s ", ll_index_to_name(ifindex));
break;
}
}
if (tb[NETCONFA_FORWARDING])
print_onoff(fp, "forwarding",
rta_getattr_u32(tb[NETCONFA_FORWARDING]));
if (tb[NETCONFA_RP_FILTER]) {
__u32 rp_filter = rta_getattr_u32(tb[NETCONFA_RP_FILTER]);
if (rp_filter == 0)
fprintf(fp, "rp_filter off ");
else if (rp_filter == 1)
fprintf(fp, "rp_filter strict ");
else if (rp_filter == 2)
fprintf(fp, "rp_filter loose ");
else
fprintf(fp, "rp_filter unknown mode ");
}
if (tb[NETCONFA_MC_FORWARDING])
print_onoff(fp, "mc_forwarding",
rta_getattr_u32(tb[NETCONFA_MC_FORWARDING]));
if (tb[NETCONFA_PROXY_NEIGH])
print_onoff(fp, "proxy_neigh",
rta_getattr_u32(tb[NETCONFA_PROXY_NEIGH]));
if (tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN])
print_onoff(fp, "ignore_routes_with_linkdown",
rta_getattr_u32(tb[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]));
if (tb[NETCONFA_INPUT])
print_onoff(fp, "input", rta_getattr_u32(tb[NETCONFA_INPUT]));
fprintf(fp, "\n");
fflush(fp);
return 0;
}
Ref<RouteInfoList> RouteInfo::queryTable()
{
Ref<RouteInfoList> list = RouteInfoList::create();
int fd = ::socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (fd == -1) FLUX_SYSTEM_DEBUG_ERROR(errno);
struct sockaddr_nl src;
memclr(&src, sizeof(src));
src.nl_family = AF_NETLINK;
src.nl_pid = ::getpid();
if (::bind(fd, (struct sockaddr *)&src, (socklen_t)sizeof(src)) == -1)
FLUX_SYSTEM_DEBUG_ERROR(errno);
// send request
{
size_t msgLen = NLMSG_LENGTH(sizeof(struct rtmsg));
struct nlmsghdr *msg = (struct nlmsghdr *)flux::malloc(msgLen);
int seq = 0;
memclr(msg, msgLen);
msg->nlmsg_type = RTM_GETROUTE;
msg->nlmsg_len = msgLen;
msg->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP;
msg->nlmsg_pid = src.nl_pid;
msg->nlmsg_seq = seq++;
struct rtmsg *data = (struct rtmsg *)NLMSG_DATA(msg);
data->rtm_table = RT_TABLE_DEFAULT;
data->rtm_protocol = RTPROT_UNSPEC;
struct sockaddr_nl dst;
memclr(&dst, sizeof(dst));
dst.nl_family = AF_NETLINK;
struct msghdr hdr;
memclr(&hdr, sizeof(hdr));
struct iovec iov = { msg, msgLen };
hdr.msg_iov = &iov;
hdr.msg_iovlen = 1;
hdr.msg_name = (void *)&dst;
hdr.msg_namelen = sizeof(dst);
if (::sendmsg(fd, &hdr, 0/*flags*/) == -1)
FLUX_SYSTEM_DEBUG_ERROR(errno);
flux::free(msg);
}
typedef Map<int, Ref<NetworkInterface> > InterfaceByIndex;
Ref<InterfaceByIndex> interfaceByIndex = InterfaceByIndex::create();
// process reply
{
struct msghdr hdr;
memclr(&hdr, sizeof(hdr));
ssize_t bufSize = ::recvmsg(fd, &hdr, MSG_PEEK|MSG_TRUNC);
if (bufSize < 0) FLUX_SYSTEM_DEBUG_ERROR(errno);
void *buf = flux::malloc(bufSize);
if (!buf) FLUX_SYSTEM_DEBUG_ERROR(errno);
struct iovec iov = { buf, (size_t)bufSize };
hdr.msg_iov = &iov;
hdr.msg_iovlen = 1;
ssize_t bufFill = ::recvmsg(fd, &hdr, 0/*flags*/);
if (::close(fd) == -1)
FLUX_SYSTEM_DEBUG_ERROR(errno);
struct nlmsghdr *msg = (struct nlmsghdr *)buf;
for (;NLMSG_OK(msg, unsigned(bufFill)); msg = NLMSG_NEXT(msg, bufFill))
{
unsigned msgType = msg->nlmsg_type;
if (msgType == RTM_NEWROUTE) {
struct rtmsg *data = (struct rtmsg *)NLMSG_DATA(msg);
struct rtattr *attr = (struct rtattr *)RTM_RTA(data);
int attrFill = NLMSG_PAYLOAD(msg, sizeof(struct rtmsg));
Ref<RouteInfo> info = RouteInfo::create();
list->append(info);
info->sourceMask_ = data->rtm_src_len;
info->destinationMask_ = data->rtm_dst_len;
for (;RTA_OK(attr, attrFill); attr = RTA_NEXT(attr, attrFill))
{
unsigned attrType = attr->rta_type;
if (
attrType == RTA_DST ||
attrType == RTA_SRC ||
attrType == RTA_GATEWAY
) {
Ref<SocketAddress> address;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
if (data->rtm_family == AF_INET) {
memclr(&addr4, sizeof(addr4));
// addr.sin_len = sizeof(addr);
*(uint8_t *)&addr4 = sizeof(addr4); // uggly, but safe HACK, for BSD4.4
addr4.sin_family = AF_INET;
addr4.sin_addr = *(struct in_addr *)RTA_DATA(attr);
address = SocketAddress::create(&addr4);
}
else if (data->rtm_family == AF_INET6) {
memclr(&addr6, sizeof(addr6));
#ifdef SIN6_LEN
addr.sin6_len = sizeof(addr6);
#endif
addr6.sin6_family = AF_INET6;
addr6.sin6_addr = *(struct in6_addr *)RTA_DATA(attr);
// addr6.sin6_scope_id = data->rtm_scope;
address = SocketAddress::create(&addr6);
}
if (attrType == RTA_DST)
info->destination_ = address;
else if (attrType == RTA_SRC)
info->source_ = address;
else if (attrType == RTA_GATEWAY)
info->gateway_ = address;
}
else if (
attrType == RTA_IIF ||
attrType == RTA_OIF
) {
int index = *(int *)RTA_DATA(attr);
Ref<NetworkInterface> interface;
if (!interfaceByIndex->lookup(index, &interface)) {
interface = NetworkInterface::getLink(index);
interfaceByIndex->insert(index, interface);
}
if (attrType == RTA_IIF)
info->inputInterface_ = interface->name();
else
info->outputInterface_ = interface->name();
}
else if (attrType == RTA_PRIORITY) {
info->priority_ = *(int *)RTA_DATA(attr);
}
else if (attrType == RTA_METRICS) {
info->metric_ = *(int *)RTA_DATA(attr);
}
}
}
else if (msgType == NLMSG_DONE) { // paranoid HACK
break;
}
}
flux::free(buf);
}
return list;
}