pfctl: zap v4mask and v6mask in host()

[Klemens Nanni]

These two just complicate the code. Let's defer checks whether an
explicit mask has been specified to where it's actually set in host_*().

My motivation is to reduce address family specific code and perhaps even
merge `host_v4()' and `host_v6()' eventually.

Feedback? OK?

Index: pfctl_parser.c
===================================================================
RCS file: /cvs/src/sbin/pfctl/pfctl_parser.c,v
retrieving revision 1.325
diff -u -p -r1.325 pfctl_parser.c
--- pfctl_parser.c      30 Jul 2018 08:28:40 -0000      1.325
+++ pfctl_parser.c      30 Jul 2018 15:53:42 -0000
@@ -76,7 +76,7 @@ struct node_host      *ifa_grouplookup(const 
 struct node_host       *host_if(const char *, int);
 struct node_host       *host_v4(const char *, int);
 struct node_host       *host_v6(const char *, int);
-struct node_host       *host_dns(const char *, int, int, int);
+struct node_host       *host_dns(const char *, int, int);
 
 const char *tcpflags = "FSRPAUEW";
 
@@ -1628,7 +1628,7 @@ struct node_host *
 host(const char *s, int opts)
 {
        struct node_host        *h = NULL, *n;
-       int                      mask = -1, v4mask = 32, v6mask = 128;
+       int                      mask = -1;
        char                    *p, *r, *ps, *if_name;
        const char              *errstr;
 
@@ -1643,20 +1643,19 @@ host(const char *s, int opts)
        if ((p = strrchr(ps, '/')) != NULL) {
                if ((r = strdup(ps)) == NULL)
                        err(1, "host: strdup");
-               mask = strtonum(p+1, 0, v6mask, &errstr);
+               mask = strtonum(p+1, 0, 128, &errstr);
                if (errstr) {
                        fprintf(stderr, "netmask is %s: %s\n", errstr, p);
                        goto error;
                }
                p[0] = '\0';
-               v4mask = v6mask = mask;
        } else
                r = ps;
 
        if ((h = host_if(ps, mask)) == NULL &&
            (h = host_v4(r, mask)) == NULL &&
-           (h = host_v6(ps, v6mask)) == NULL &&
-           (h = host_dns(ps, v4mask, v6mask, (opts & PF_OPT_NODNS))) == NULL) {
+           (h = host_v6(ps, mask)) == NULL &&
+           (h = host_dns(ps, mask, (opts & PF_OPT_NODNS))) == NULL) {
                fprintf(stderr, "no IP address found for %s\n", s);
                goto error;
        }
@@ -1773,7 +1772,7 @@ host_v6(const char *s, int mask)
                    sizeof(h->addr.v.a.addr));
                h->ifindex =
                    ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
-               set_ipmask(h, mask);
+               set_ipmask(h, mask > -1 ? mask : 128);
                freeaddrinfo(res);
                h->next = NULL;
                h->tail = h;
@@ -1783,7 +1782,7 @@ host_v6(const char *s, int mask)
 }
 
 struct node_host *
-host_dns(const char *s, int v4mask, int v6mask, int numeric)
+host_dns(const char *s, int mask, int numeric)
 {
        struct addrinfo          hints, *res0, *res;
        struct node_host        *n, *h = NULL;
@@ -1829,7 +1828,7 @@ host_dns(const char *s, int v4mask, int 
                            &((struct sockaddr_in *)
                            res->ai_addr)->sin_addr.s_addr,
                            sizeof(struct in_addr));
-                       set_ipmask(n, v4mask);
+                       set_ipmask(n, mask > -1 ? mask : 32);
                } else {
                        memcpy(&n->addr.v.a.addr,
                            &((struct sockaddr_in6 *)
@@ -1838,7 +1837,7 @@ host_dns(const char *s, int v4mask, int 
                        n->ifindex =
                            ((struct sockaddr_in6 *)
                            res->ai_addr)->sin6_scope_id;
-                       set_ipmask(n, v6mask);
+                       set_ipmask(n, mask > -1 ? mask : 128);
                }
                n->next = NULL;
                n->tail = n;