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/*
* decodenetnum - return a net number (this is crude, but careful)
*/
#include <config.h>
#include <sys/types.h>
#include <ctype.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include "ntp.h"
#include "ntp_stdlib.h"
#include "ntp_assert.h"
/*
* decodenetnum convert text IP address and port to sockaddr_u
*
* Returns 0 for failure, 1 for success.
*/
int
decodenetnum(
const char *num,
sockaddr_u *netnum
)
{
struct addrinfo hints, *ai = NULL;
int err;
u_short port;
const char *cp;
const char *port_str;
char *pp;
char *np;
char name[80];
NTP_REQUIRE(num != NULL);
NTP_REQUIRE(strlen(num) < sizeof(name));
port_str = NULL;
if ('[' != num[0]) {
/*
* to distinguish IPv6 embedded colons from a port
* specification on an IPv4 address, assume all
* legal IPv6 addresses have at least two colons.
*/
pp = strchr(num, ':');
if (NULL == pp)
cp = num; /* no colons */
else if (NULL != strchr(pp + 1, ':'))
cp = num; /* two or more colons */
else { /* one colon */
strlcpy(name, num, sizeof(name));
cp = name;
pp = strchr(cp, ':');
*pp = '\0';
port_str = pp + 1;
}
} else {
cp = num + 1;
np = name;
while (*cp && ']' != *cp)
*np++ = *cp++;
*np = 0;
if (']' == cp[0] && ':' == cp[1] && '\0' != cp[2])
port_str = &cp[2];
cp = name;
}
ZERO(hints);
hints.ai_flags = Z_AI_NUMERICHOST;
err = getaddrinfo(cp, "ntp", &hints, &ai);
if (err != 0)
return 0;
NTP_INSIST(ai->ai_addrlen <= sizeof(*netnum));
ZERO(*netnum);
memcpy(netnum, ai->ai_addr, ai->ai_addrlen);
freeaddrinfo(ai);
if (NULL == port_str || 1 != sscanf(port_str, "%hu", &port))
port = NTP_PORT;
SET_PORT(netnum, port);
return 1;
}
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