net: Add functions to get dest address of P-t-P link

These functions are needed when we need to setup a route
to point-to-point link destination address. The route is
needed if P-t-P link does not have a default route.

diff --git a/include/inet.h b/include/inet.h
index 1aa23ea..60525d5 100644 (file)
--- a/include/inet.h
+++ b/include/inet.h
@@ -78,6 +78,8 @@ int connman_inet_remove_from_bridge(int index, const char *bridge);
 int connman_inet_set_mtu(int index, int mtu);
 int connman_inet_setup_tunnel(char *tunnel, int mtu);
 int connman_inet_create_tunnel(char **iface);
+int connman_inet_get_dest_addr(int index, char **dest);
+int connman_inet_ipv6_get_dest_addr(int index, char **dest);
 
 #ifdef __cplusplus
 }

diff --git a/src/inet.c b/src/inet.c
index 5b81273..6202021 100644 (file)
--- a/src/inet.c
+++ b/src/inet.c
@@ -1781,3 +1781,97 @@ GSList *__connman_inet_ipv6_get_prefixes(struct nd_router_advert *hdr,
 
        return prefixes;
 }
+
+static int get_dest_addr(int family, int index, char *buf, int len)
+{
+       struct ifreq ifr;
+       void *addr;
+       int sk;
+
+       sk = socket(family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
+       if (sk < 0)
+               return -errno;
+
+       memset(&ifr, 0, sizeof(ifr));
+       ifr.ifr_ifindex = index;
+
+       if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
+               DBG("SIOCGIFNAME (%d/%s)", errno, strerror(errno));
+               close(sk);
+               return -errno;
+       }
+
+       if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
+               DBG("SIOCGIFFLAGS (%d/%s)", errno, strerror(errno));
+               close(sk);
+               return -errno;
+       }
+
+       if ((ifr.ifr_flags & IFF_POINTOPOINT) == 0) {
+               close(sk);
+               errno = EINVAL;
+               return -errno;
+       }
+
+       DBG("index %d %s", index, ifr.ifr_name);
+
+       if (ioctl(sk, SIOCGIFDSTADDR, &ifr) < 0) {
+               connman_error("Get destination address failed (%s)",
+                                                       strerror(errno));
+               close(sk);
+               return -errno;
+       }
+
+       close(sk);
+
+       switch (family) {
+       case AF_INET:
+               addr = &((struct sockaddr_in *)&ifr.ifr_dstaddr)->sin_addr;
+               break;
+       case AF_INET6:
+               addr = &((struct sockaddr_in6 *)&ifr.ifr_dstaddr)->sin6_addr;
+               break;
+       default:
+               errno = EINVAL;
+               return -errno;
+       }
+
+       if (inet_ntop(family, addr, buf, len) == NULL) {
+               DBG("error %d/%s", errno, strerror(errno));
+               return -errno;
+       }
+
+       return 0;
+}
+
+int connman_inet_get_dest_addr(int index, char **dest)
+{
+       char addr[INET_ADDRSTRLEN];
+       int ret;
+
+       ret = get_dest_addr(PF_INET, index, addr, INET_ADDRSTRLEN);
+       if (ret < 0)
+               return ret;
+
+       *dest = g_strdup(addr);
+
+       DBG("destination %s", *dest);
+
+       return 0;
+}
+
+int connman_inet_ipv6_get_dest_addr(int index, char **dest)
+{
+       char addr[INET6_ADDRSTRLEN];
+       int ret;
+
+       ret = get_dest_addr(PF_INET6, index, addr, INET6_ADDRSTRLEN);
+       if (ret < 0)
+               return ret;
+
+       *dest = g_strdup(addr);
+
+       DBG("destination %s", *dest);
+
+       return 0;
+}