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
is_ip_address(const char * host,u_short af,sockaddr_u * addr)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