Return to decodenetnum.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / ntp / libntp

ntp 4.2.6p5

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