/*
* Obtain a socket to talk to this guy.
* Not entirely trivial - this can be both an established
* (incoming) connection, or one that we should establish.
*
* Note, we do not support transmission on the incoming
* connection yet.
*/
static isns_socket_t *
isns_scn_get_socket(isns_scn_t *scn)
{
isns_scn_funnel_t *f, *best = NULL;
isns_socket_t *sock;
unsigned int worst = 0, loops = 0, nfunnels;
/* Keep it simple for now */
if ((f = scn->scn_current_funnel) != NULL && f->scn_socket) {
if (!f->scn_bad)
return f->scn_socket;
/* Oops, we've seen timeouts on this socket. */
isns_socket_free(f->scn_socket);
f->scn_socket = NULL;
}
again:
nfunnels = 0;
for (f = scn->scn_funnels; f; f = f->scn_next) {
unsigned int badness = f->scn_bad;
if (!best || badness < best->scn_bad)
best = f;
if (badness > worst)
worst = badness;
nfunnels++;
}
if (!best)
return NULL;
sock = isns_connect_to_portal(&best->scn_portal);
if (sock == NULL) {
/* Make sure we try each funnel exactly once */
best->scn_bad = worst + 1;
if (++loops < nfunnels)
goto again;
return NULL;
}
/* Set the security context */
isns_socket_set_security_ctx(sock,
isns_default_security_context(1));
isns_debug_scn("SCN: %s using portal %s\n",
scn->scn_name,
isns_portal_string(&best->scn_portal));
scn->scn_current_funnel = best;
best->scn_socket = sock;
return sock;
}
int
isns_enumerate_portals(isns_portal_info_t *result, unsigned int max)
{
char buffer[8192], *end, *ptr;
struct ifconf ifc;
unsigned int nportals = 0;
int fd = -1;
if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
isns_error("%s: no socket - %m\n", __FUNCTION__);
return 0;
}
ifc.ifc_buf = buffer;
ifc.ifc_len = sizeof(buffer);
if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
isns_error("ioctl(SIOCGIFCONF): %m\n");
goto out;
}
ptr = buffer;
end = buffer + ifc.ifc_len;
while (ptr < end) {
struct ifreq ifr;
struct sockaddr_storage ifaddr;
isns_portal_info_t portal;
int ifflags;
memcpy(&ifr, ptr, sizeof(ifr));
ptr += sizeof(ifr);
/* Get the interface addr */
memcpy(&ifaddr, &ifr.ifr_addr, sizeof(ifr.ifr_addr));
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
isns_error("ioctl(%s, SIOCGIFFLAGS): %m\n",
ifr.ifr_name);
continue;
}
ifflags = ifr.ifr_flags;
if ((ifflags & IFF_UP) == 0)
continue;
if ((ifflags & IFF_LOOPBACK) != 0)
continue;
if (!isns_portal_from_sockaddr(&portal, &ifaddr))
continue;
isns_debug_socket("Got interface %u: %s %s\n",
nportals, ifr.ifr_name,
isns_portal_string(&portal));
if (nportals < max)
result[nportals++] = portal;
}
out:
if (fd >= 0)
close(fd);
return nportals;
}
