90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
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/*
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* is_ip_address
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "ntp_assert.h"
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#include "ntp_stdlib.h"
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#include "safecast.h"
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/* Don't include ISC's version of IPv6 variables and structures */
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#define ISC_IPV6_H 1
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#include <isc/netaddr.h>
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#include <isc/sockaddr.h>
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/*
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* Code to tell if we have an IP address
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* If we have then return the sockaddr structure
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* and set the return value
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* see the bind9/getaddresses.c for details
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*/
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int
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is_ip_address(
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const char * host,
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u_short af,
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sockaddr_u * addr
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)
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{
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struct in_addr in4;
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struct addrinfo hints;
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struct addrinfo *result;
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struct sockaddr_in6 *resaddr6;
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char tmpbuf[128];
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char *pch;
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REQUIRE(host != NULL);
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REQUIRE(addr != NULL);
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ZERO_SOCK(addr);
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/*
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* Try IPv4, then IPv6. In order to handle the extended format
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* for IPv6 scoped addresses (address%scope_ID), we'll use a local
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* working buffer of 128 bytes. The length is an ad-hoc value, but
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* should be enough for this purpose; the buffer can contain a string
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* of at least 80 bytes for scope_ID in addition to any IPv6 numeric
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* addresses (up to 46 bytes), the delimiter character and the
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* terminating NULL character.
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*/
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if (AF_UNSPEC == af || AF_INET == af)
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if (inet_pton(AF_INET, host, &in4) == 1) {
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AF(addr) = AF_INET;
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SET_ADDR4N(addr, in4.s_addr);
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return TRUE;
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}
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if (AF_UNSPEC == af || AF_INET6 == af)
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if (sizeof(tmpbuf) > strlen(host)) {
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if ('[' == host[0]) {
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strlcpy(tmpbuf, &host[1], sizeof(tmpbuf));
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pch = strchr(tmpbuf, ']');
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if (pch != NULL)
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*pch = '\0';
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} else {
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strlcpy(tmpbuf, host, sizeof(tmpbuf));
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}
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ZERO(hints);
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hints.ai_family = AF_INET6;
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hints.ai_flags |= AI_NUMERICHOST;
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if (getaddrinfo(tmpbuf, NULL, &hints, &result) == 0) {
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AF(addr) = AF_INET6;
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resaddr6 = UA_PTR(struct sockaddr_in6, result->ai_addr);
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SET_ADDR6N(addr, resaddr6->sin6_addr);
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SET_SCOPE(addr, resaddr6->sin6_scope_id);
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freeaddrinfo(result);
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return TRUE;
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}
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}
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/*
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* If we got here it was not an IP address
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*/
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return FALSE;
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}
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