1/*	$NetBSD: decodenetnum.c,v 1.1.1.2 2012/01/31 21:24:16 kardel Exp $	*/
2
3/*
4 * decodenetnum - return a net number (this is crude, but careful)
5 */
6#include <config.h>
7#include <sys/types.h>
8#include <ctype.h>
9#ifdef HAVE_SYS_SOCKET_H
10#include <sys/socket.h>
11#endif
12#ifdef HAVE_NETINET_IN_H
13#include <netinet/in.h>
14#endif
15
16#include "ntp.h"
17#include "ntp_stdlib.h"
18#include "ntp_assert.h"
19
20/*
21 * decodenetnum		convert text IP address and port to sockaddr_u
22 *
23 * Returns 0 for failure, 1 for success.
24 */
25int
26decodenetnum(
27	const char *num,
28	sockaddr_u *netnum
29	)
30{
31	struct addrinfo hints, *ai = NULL;
32	int err;
33	u_short port;
34	const char *cp;
35	const char *port_str;
36	char *pp;
37	char *np;
38	char name[80];
39
40	NTP_REQUIRE(num != NULL);
41	NTP_REQUIRE(strlen(num) < sizeof(name));
42
43	port_str = NULL;
44	if ('[' != num[0]) {
45		/*
46		 * to distinguish IPv6 embedded colons from a port
47		 * specification on an IPv4 address, assume all
48		 * legal IPv6 addresses have at least two colons.
49		 */
50		pp = strchr(num, ':');
51		if (NULL == pp)
52			cp = num;	/* no colons */
53		else if (NULL != strchr(pp + 1, ':'))
54			cp = num;	/* two or more colons */
55		else {			/* one colon */
56			strncpy(name, num, sizeof(name));
57			name[sizeof(name) - 1] = '\0';
58			cp = name;
59			pp = strchr(cp, ':');
60			*pp = '\0';
61			port_str = pp + 1;
62		}
63	} else {
64		cp = num + 1;
65		np = name;
66		while (*cp && ']' != *cp)
67			*np++ = *cp++;
68		*np = 0;
69		if (']' == cp[0] && ':' == cp[1] && '\0' != cp[2])
70			port_str = &cp[2];
71		cp = name;
72	}
73	ZERO(hints);
74	hints.ai_flags = Z_AI_NUMERICHOST;
75	err = getaddrinfo(cp, "ntp", &hints, &ai);
76	if (err != 0)
77		return 0;
78	NTP_INSIST(ai->ai_addrlen <= sizeof(*netnum));
79	memcpy(netnum, ai->ai_addr, ai->ai_addrlen);
80	freeaddrinfo(ai);
81	if (NULL == port_str || 1 != sscanf(port_str, "%hu", &port))
82		port = NTP_PORT;
83	SET_PORT(netnum, port);
84	return 1;
85}
86