misc.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright 2001 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Misc routines that are used by tcpd and by tcpdchk.
*
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
*/
#ifndef lint
static char sccsic[] = "@(#) misc.c 1.2 96/02/11 17:01:29";
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <netdb.h>
#include "tcpd.h"
extern char *fgets();
#ifndef INADDR_NONE
#define INADDR_NONE (-1) /* XXX should be 0xffffffff */
#endif
/* xgets - fgets() with backslash-newline stripping */
char *xgets(ptr, len, fp)
char *ptr;
int len;
FILE *fp;
{
int got;
char *start = ptr;
while (fgets(ptr, len, fp)) {
got = strlen(ptr);
if (got >= 1 && ptr[got - 1] == '\n') {
tcpd_context.line++;
if (got >= 2 && ptr[got - 2] == '\\') {
got -= 2;
} else {
return (start);
}
}
ptr += got;
len -= got;
ptr[0] = 0;
}
return (ptr > start ? start : 0);
}
/* split_at - break string at delimiter or return NULL */
char *split_at(string, delimiter)
char *string;
int delimiter;
{
char *cp;
if ((cp = strchr(string, delimiter)) != 0)
*cp++ = 0;
return (cp);
}
/* dot_quad_addr - convert dotted quad to internal form */
unsigned long dot_quad_addr(str)
char *str;
{
int in_run = 0;
int runs = 0;
char *cp = str;
/* Count the number of runs of non-dot characters. */
while (*cp) {
if (*cp == '.') {
in_run = 0;
} else if (in_run == 0) {
in_run = 1;
runs++;
}
cp++;
}
return (runs == 4 ? inet_addr(str) : INADDR_NONE);
}
/* numeric_addr - convert textual IP address to binary form */
int numeric_addr(str, addr, af, len)
char *str;
union gen_addr *addr;
int *af;
int *len;
{
union gen_addr t;
if (addr == NULL)
addr = &t;
#ifdef HAVE_IPV6
if (strchr(str,':')) {
if (af) *af = AF_INET6;
if (len) *len = sizeof(struct in6_addr);
if (inet_pton(AF_INET6, str, (void*) addr) == 1)
return 0;
return -1;
}
#endif
if (af) *af = AF_INET;
if (len) *len = sizeof(struct in_addr);
addr->ga_in.s_addr = dot_quad_addr(str);
return addr->ga_in.s_addr == INADDR_NONE ? -1 : 0;
}
/* For none RFC 2553 compliant systems */
#ifdef USE_GETHOSTBYNAME2
#define getipnodebyname(h,af,flags,err) gethostbyname2(h,af)
#define freehostent(x) x = 0
#endif
/* tcpd_gethostbyname - an IP family neutral gethostbyname */
struct hostent *tcpd_gethostbyname(host, af)
char *host;
int af;
{
#ifdef HAVE_IPV6
struct hostent *hp;
static struct hostent *hs; /* freehostent() on next call */
int err;
if (af == AF_INET6) { /* must be AF_INET6 */
if (hs)
freehostent(hs);
return (hs = getipnodebyname(host, AF_INET6, 0, &err));
}
hp = gethostbyname(host);
if (hp != NULL || af == AF_INET) { /* found or must be AF_INET */
return hp;
} else { /* Try INET6 */
if (hs)
freehostent(hs);
return (hs = getipnodebyname(host, AF_INET6, 0, &err));
}
#else
return gethostbyname(host);
#endif
}
#ifdef HAVE_IPV6
/*
* When using IPv6 addresses, we'll be seeing lots of ":"s;
* we require the addresses to be specified as [address].
* An IPv6 address can be specified in 3 ways:
*
* x:x:x:x:x:x:x:x (fully specified)
* x::x:x:x:x (zeroes squashed)
* ::FFFF:1.2.3.4 (IPv4 mapped)
*
* These need to be skipped to get at the ":" delimeters.
*
* We also allow a '/prefix' specifier.
*/
char *skip_ipv6_addrs(str)
char *str;
{
char *obr, *cbr, *colon;
char *p = str;
char *q;
while (1) {
if ((colon = strchr(p, ':')) == NULL)
return p;
if ((obr = strchr(p, '[')) == NULL || obr > colon)
return p;
if ((cbr = strchr(obr, ']')) == NULL)
return p;
for (q = obr + 1; q < cbr; q++) {
/*
* Quick and dirty parse, cheaper than inet_pton
* Could count colons and dots (must be 0 or 3 dots, no
* colons after dots seens, only one double :, etc, etc)
*/
if (*q != ':' && *q != '.' && *q != '/' && !isxdigit(*q & 0xff))
return p;
}
p = cbr + 1;
}
}
#endif /* HAVE_IPV6 */