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-rw-r--r--lib/socket/interfaces.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/lib/socket/interfaces.c b/lib/socket/interfaces.c
index 4908b0f..2426ce2 100644
--- a/lib/socket/interfaces.c
+++ b/lib/socket/interfaces.c
@@ -386,18 +386,18 @@ static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
if (((struct sockaddr *)&i1->ip)->sa_family == AF_INET) {
struct sockaddr_in *s1 = (struct sockaddr_in *)&i1->ip;
struct sockaddr_in *s2 = (struct sockaddr_in *)&i2->ip;
-
- r = ntohl(s1->sin_addr.s_addr) -
- ntohl(s2->sin_addr.s_addr);
- if (r) {
- return r;
+ uint32_t a1 = ntohl(s1->sin_addr.s_addr);
+ uint32_t a2 = ntohl(s2->sin_addr.s_addr);
+ r = NUMERIC_CMP(a1, a2);
+ if (r == 0) {
+ /* compare netmasks as a tiebreaker */
+ s1 = (struct sockaddr_in *)&i1->netmask;
+ s2 = (struct sockaddr_in *)&i2->netmask;
+ a1 = ntohl(s1->sin_addr.s_addr);
+ a2 = ntohl(s2->sin_addr.s_addr);
+ r = NUMERIC_CMP(a1, a2);
}
-
- s1 = (struct sockaddr_in *)&i1->netmask;
- s2 = (struct sockaddr_in *)&i2->netmask;
-
- return ntohl(s1->sin_addr.s_addr) -
- ntohl(s2->sin_addr.s_addr);
+ return r;
}
return 0;
}