remove cruft from old resolver and numeric ip parsing

the old resolver code used a function __ipparse which contained the
logic for inet_addr and inet_aton, which is needed in getaddrinfo.
this was phased out in the resolver overhaul in favor of directly
using inet_aton and inet_pton as appropriate.

this commit cleans up some stuff that was left behind.

src/network/__dns.h

-#include <stddef.h>
-
-#define RR_A 1
-#define RR_CNAME 5
-#define RR_PTR 12
-#define RR_AAAA 28
-
-int __dns_count_addrs(const unsigned char *, int);
-int __dns_get_rr(void *, size_t, size_t, size_t, const unsigned char *, int, int);
-
-int __dns_query(unsigned char *, const void *, int, int);
-int __ipparse(void *, int, const char *);
-
-int __dns_doqueries(unsigned char *, const char *, int *, int);

src/network/inet_addr.c

 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include "__dns.h"
+
+int __inet_aton(const char *, struct in_addr *);
 
 in_addr_t inet_addr(const char *p)
 {
-	struct sockaddr_in sin;
-	if (__ipparse(&sin, AF_INET, p) < 0) return -1;
-	return sin.sin_addr.s_addr;
+	struct in_addr a;
+	if (!__inet_aton(p, &a)) return -1;
+	return a.s_addr;
 }

src/network/__ipparse.c → src/network/inet_aton.c

-#include <stdlib.h>
 #include <ctype.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include "__dns.h"
+#include "libc.h"
 
-int __ipparse(void *dest, int family, const char *s0)
+int __inet_aton(const char *s0, struct in_addr *dest)
 {
 	const char *s = s0;
-	unsigned char *d = dest;
-	unsigned long a[16] = { 0 };
+	unsigned char *d = (void *)dest;
+	unsigned long a[4] = { 0 };
 	char *z;
 	int i;
 
-	if (family == AF_INET6) goto not_v4;
-
 	for (i=0; i<4; i++) {
 		a[i] = strtoul(s, &z, 0);
-		if (z==s || (*z && *z != '.') || !isdigit(*s)) {
-			if (family == AF_INET) return -1;
-			goto not_v4;
-		}
+		if (z==s || (*z && *z != '.') || !isdigit(*s))
+			return 0;
 		if (!*z) break;
 		s=z+1;
 	}
-	if (i==4) return -1;
+	if (i==4) return 0;
 	switch (i) {
 	case 0:
 		a[1] = a[0] & 0xffffff;
@@ -36,16 +31,11 @@ int __ipparse(void *dest, int family, const char *s0)
 		a[3] = a[2] & 0xff;
 		a[2] >>= 8;
 	}
-	((struct sockaddr_in *)d)->sin_family = AF_INET;
-	d = (void *)&((struct sockaddr_in *)d)->sin_addr;
 	for (i=0; i<4; i++) {
-		if (a[i] > 255) return -1;
+		if (a[i] > 255) return 0;
 		d[i] = a[i];
 	}
-	return 0;
-
-not_v4:
-	s = s0;
-	((struct sockaddr_in6 *)d)->sin6_family = AF_INET6;
-	return inet_pton(AF_INET6, s, (void *)&((struct sockaddr_in6 *)d)->sin6_addr) <= 0 ? -1 : 0;
+	return 1;
 }
+
+weak_alias(__inet_aton, inet_aton);

src/network/inet_legacy.c

 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#include "__dns.h"
 
 in_addr_t inet_network(const char *p)
 {
 	return ntohl(inet_addr(p));
 }
 
-int inet_aton(const char *cp, struct in_addr *inp)
-{
-	struct sockaddr_in sin;
-	if (__ipparse(&sin, AF_INET, cp) < 0) return 0;
-	*inp = sin.sin_addr;
-	return 1;
-}
-
 struct in_addr inet_makeaddr(in_addr_t n, in_addr_t h)
 {
 	if (n < 256) h |= n<<24;

src/network/lookup_name.c

@@ -36,11 +36,13 @@ static int name_from_null(struct address buf[static 2], const char *name, int fa
 	return cnt;
 }
 
+int __inet_aton(const char *, struct in_addr *);
+
 static int name_from_numeric(struct address buf[static 1], const char *name, int family)
 {
 	struct in_addr a4;
 	struct in6_addr a6;
-	if (family != AF_INET6 && inet_aton(name, &a4)>0) {
+	if (family != AF_INET6 && __inet_aton(name, &a4)>0) {
 		memcpy(&buf[0].addr, &a4, sizeof a4);
 		buf[0].family = AF_INET;
 		return 1;