xref: /freebsd/contrib/ntp/libntp/is_ip_address.c (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
1 /*
2  * is_ip_address
3  *
4  */
5 
6 #ifdef HAVE_CONFIG_H
7 # include <config.h>
8 #endif
9 
10 #include "ntp_assert.h"
11 #include "ntp_stdlib.h"
12 #include "safecast.h"
13 
14 /* Don't include ISC's version of IPv6 variables and structures */
15 #define ISC_IPV6_H 1
16 #include <isc/netaddr.h>
17 #include <isc/sockaddr.h>
18 
19 
20 /*
21  * Code to tell if we have an IP address
22  * If we have then return the sockaddr structure
23  * and set the return value
24  * see the bind9/getaddresses.c for details
25  */
26 int
27 is_ip_address(
28 	const char *	host,
29 	u_short		af,
30 	sockaddr_u *	addr
31 	)
32 {
33 	struct in_addr in4;
34 	struct addrinfo hints;
35 	struct addrinfo *result;
36 	struct sockaddr_in6 *resaddr6;
37 	char tmpbuf[128];
38 	char *pch;
39 
40 	REQUIRE(host != NULL);
41 	REQUIRE(addr != NULL);
42 
43 	ZERO_SOCK(addr);
44 
45 	/*
46 	 * Try IPv4, then IPv6.  In order to handle the extended format
47 	 * for IPv6 scoped addresses (address%scope_ID), we'll use a local
48 	 * working buffer of 128 bytes.  The length is an ad-hoc value, but
49 	 * should be enough for this purpose; the buffer can contain a string
50 	 * of at least 80 bytes for scope_ID in addition to any IPv6 numeric
51 	 * addresses (up to 46 bytes), the delimiter character and the
52 	 * terminating NULL character.
53 	 */
54 	if (AF_UNSPEC == af || AF_INET == af)
55 		if (inet_pton(AF_INET, host, &in4) == 1) {
56 			AF(addr) = AF_INET;
57 			SET_ADDR4N(addr, in4.s_addr);
58 
59 			return TRUE;
60 		}
61 
62 	if (AF_UNSPEC == af || AF_INET6 == af)
63 		if (sizeof(tmpbuf) > strlen(host)) {
64 			if ('[' == host[0]) {
65 				strlcpy(tmpbuf, &host[1], sizeof(tmpbuf));
66 				pch = strchr(tmpbuf, ']');
67 				if (pch != NULL)
68 					*pch = '\0';
69 			} else {
70 				strlcpy(tmpbuf, host, sizeof(tmpbuf));
71 			}
72 			ZERO(hints);
73 			hints.ai_family = AF_INET6;
74 			hints.ai_flags |= AI_NUMERICHOST;
75 			if (getaddrinfo(tmpbuf, NULL, &hints, &result) == 0) {
76 				AF(addr) = AF_INET6;
77 				resaddr6 = UA_PTR(struct sockaddr_in6, result->ai_addr);
78 				SET_ADDR6N(addr, resaddr6->sin6_addr);
79 				SET_SCOPE(addr, resaddr6->sin6_scope_id);
80 
81 				freeaddrinfo(result);
82 				return TRUE;
83 			}
84 		}
85 	/*
86 	 * If we got here it was not an IP address
87 	 */
88 	return FALSE;
89 }
90