/* $NetBSD: nametoaddr.c,v 1.7 2024/09/02 15:33:37 christos Exp $ */
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Name to id translation routines used by the scanner.
* These functions are not time critical.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: nametoaddr.c,v 1.7 2024/09/02 15:33:37 christos Exp $");
#include <config.h>
#ifdef DECNETLIB
#include <sys/types.h>
#include <netdnet/dnetdb.h>
#endif
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#ifdef INET6
/*
* To quote the MSDN page for getaddrinfo() at
*
*
https://msdn.microsoft.com/en-us/library/windows/desktop/ms738520(v=vs.85).aspx
*
* "Support for getaddrinfo on Windows 2000 and older versions
* The getaddrinfo function was added to the Ws2_32.dll on Windows XP and
* later. To execute an application that uses this function on earlier
* versions of Windows, then you need to include the Ws2tcpip.h and
* Wspiapi.h files. When the Wspiapi.h include file is added, the
* getaddrinfo function is defined to the WspiapiGetAddrInfo inline
* function in the Wspiapi.h file. At runtime, the WspiapiGetAddrInfo
* function is implemented in such a way that if the Ws2_32.dll or the
* Wship6.dll (the file containing getaddrinfo in the IPv6 Technology
* Preview for Windows 2000) does not include getaddrinfo, then a
* version of getaddrinfo is implemented inline based on code in the
* Wspiapi.h header file. This inline code will be used on older Windows
* platforms that do not natively support the getaddrinfo function."
*
* We use getaddrinfo(), so we include Wspiapi.h here.
*/
#include <wspiapi.h>
#endif /* INET6 */
#else /* _WIN32 */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#ifdef HAVE_ETHER_HOSTTON
#if defined(NET_ETHERNET_H_DECLARES_ETHER_HOSTTON)
/*
* OK, just include <net/ethernet.h>.
*/
#include <net/ethernet.h>
#elif defined(NETINET_ETHER_H_DECLARES_ETHER_HOSTTON)
/*
* OK, just include <netinet/ether.h>
*/
#include <netinet/ether.h>
#elif defined(SYS_ETHERNET_H_DECLARES_ETHER_HOSTTON)
/*
* OK, just include <sys/ethernet.h>
*/
#include <sys/ethernet.h>
#elif defined(ARPA_INET_H_DECLARES_ETHER_HOSTTON)
/*
* OK, just include <arpa/inet.h>
*/
#include <arpa/inet.h>
#elif defined(NETINET_IF_ETHER_H_DECLARES_ETHER_HOSTTON)
/*
* OK, include <netinet/if_ether.h>, after all the other stuff we
* need to include or define for its benefit.
*/
#define NEED_NETINET_IF_ETHER_H
#else
/*
* We'll have to declare it ourselves.
* If <netinet/if_ether.h> defines struct ether_addr, include
* it. Otherwise, define it ourselves.
*/
#ifdef HAVE_STRUCT_ETHER_ADDR
#define NEED_NETINET_IF_ETHER_H
#else /* HAVE_STRUCT_ETHER_ADDR */
struct ether_addr {
unsigned char ether_addr_octet[6];
};
#endif /* HAVE_STRUCT_ETHER_ADDR */
#endif /* what declares ether_hostton() */
#ifdef NEED_NETINET_IF_ETHER_H
#include <net/if.h> /* Needed on some platforms */
#include <netinet/in.h> /* Needed on some platforms */
#include <netinet/if_ether.h>
#endif /* NEED_NETINET_IF_ETHER_H */
#ifndef HAVE_DECL_ETHER_HOSTTON
/*
* No header declares it, so declare it ourselves.
*/
extern int ether_hostton(const char *, struct ether_addr *);
#endif /* !defined(HAVE_DECL_ETHER_HOSTTON) */
#endif /* HAVE_ETHER_HOSTTON */
#include <arpa/inet.h>
#include <netdb.h>
#endif /* _WIN32 */
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "pcap-int.h"
#include "diag-control.h"
#include "gencode.h"
#include <pcap/namedb.h>
#include "nametoaddr.h"
#include "thread-local.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#ifndef NTOHL
#define NTOHL(x) (x) = ntohl(x)
#define NTOHS(x) (x) = ntohs(x)
#endif
/*
* Convert host name to internet address.
* Return 0 upon failure.
* XXX - not thread-safe; don't use it inside libpcap.
*/
bpf_u_int32 **
pcap_nametoaddr(const char *name)
{
#ifndef h_addr
static bpf_u_int32 *hlist[2];
#endif
bpf_u_int32 **p;
struct hostent *hp;
/*
* gethostbyname() is deprecated on Windows, perhaps because
* it's not thread-safe, or because it doesn't support IPv6,
* or both.
*
* We deprecate pcap_nametoaddr() on all platforms because
* it's not thread-safe; we supply it for backwards compatibility,
* so suppress the deprecation warning. We could, I guess,
* use getaddrinfo() and construct the array ourselves, but
* that's probably not worth the effort, as that wouldn't make
* this thread-safe - we can't change the API to require that
* our caller free the address array, so we still have to reuse
* a local array.
*/
DIAG_OFF_DEPRECATION
if ((hp = gethostbyname(name)) != NULL) {
DIAG_ON_DEPRECATION
#ifndef h_addr
hlist[0] = (bpf_u_int32 *)hp->h_addr;
NTOHL(hp->h_addr);
return hlist;
#else
for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
NTOHL(**p);
return (bpf_u_int32 **)hp->h_addr_list;
#endif
}
else
return 0;
}
struct addrinfo *
pcap_nametoaddrinfo(const char *name)
{
struct addrinfo hints, *res;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM; /*not really*/
hints.ai_protocol = IPPROTO_TCP; /*not really*/
error = getaddrinfo(name, NULL, &hints, &res);
if (error)
return NULL;
else
return res;
}
/*
* Convert net name to internet address.
* Return 0 upon failure.
* XXX - not guaranteed to be thread-safe! See below for platforms
* on which it is thread-safe and on which it isn't.
*/
#if defined(_WIN32) || defined(__CYGWIN__)
bpf_u_int32
pcap_nametonetaddr(const char *name _U_)
{
/*
* There's no "getnetbyname()" on Windows.
*
* XXX - I guess we could use the BSD code to read
* C:\Windows\System32\drivers\etc/networks, assuming
* that's its home on all the versions of Windows
* we use, but that file probably just has the loopback
* network on 127/24 on 99 44/100% of Windows machines.
*
* (Heck, these days it probably just has that on 99 44/100%
* of *UN*X* machines.)
*/
return 0;
}
#else /* _WIN32 */
bpf_u_int32
pcap_nametonetaddr(const char *name)
{
/*
* UN*X.
*/
struct netent *np;
#if defined(HAVE_LINUX_GETNETBYNAME_R)
/*
* We have Linux's reentrant getnetbyname_r().
*/
struct netent result_buf;
char buf[1024]; /* arbitrary size */
int h_errnoval;
int err;
/*
* Apparently, the man page at
*
*
http://man7.org/linux/man-pages/man3/getnetbyname_r.3.html
*
* lies when it says
*
* If the function call successfully obtains a network record,
* then *result is set pointing to result_buf; otherwise, *result
* is set to NULL.
*
* and, in fact, at least in some versions of GNU libc, it does
* *not* always get set if getnetbyname_r() succeeds.
*/
np = NULL;
err = getnetbyname_r(name, &result_buf, buf, sizeof buf, &np,
&h_errnoval);
if (err != 0) {
/*
* XXX - dynamically allocate the buffer, and make it
* bigger if we get ERANGE back?
*/
return 0;
}
#elif defined(HAVE_SOLARIS_IRIX_GETNETBYNAME_R)
/*
* We have Solaris's and IRIX's reentrant getnetbyname_r().
*/
struct netent result_buf;
char buf[1024]; /* arbitrary size */
np = getnetbyname_r(name, &result_buf, buf, (int)sizeof buf);
#elif defined(HAVE_AIX_GETNETBYNAME_R)
/*
* We have AIX's reentrant getnetbyname_r().
*/
struct netent result_buf;
struct netent_data net_data;
if (getnetbyname_r(name, &result_buf, &net_data) == -1)
np = NULL;
else
np = &result_buf;
#else
/*
* We don't have any getnetbyname_r(); either we have a
* getnetbyname() that uses thread-specific data, in which
* case we're thread-safe (sufficiently recent FreeBSD,
* sufficiently recent Darwin-based OS, sufficiently recent
* HP-UX, sufficiently recent Tru64 UNIX), or we have the
* traditional getnetbyname() (everything else, including
* current NetBSD and OpenBSD), in which case we're not
* thread-safe.
*/
np = getnetbyname(name);
#endif
if (np != NULL)
return np->n_net;
else
return 0;
}
#endif /* _WIN32 */
/*
* Convert a port name to its port and protocol numbers.
* We assume only TCP or UDP.
* Return 0 upon failure.
*/
int
pcap_nametoport(const char *name, int *port, int *proto)
{
struct addrinfo hints, *res, *ai;
int error;
struct sockaddr_in *in4;
#ifdef INET6
struct sockaddr_in6 *in6;
#endif
int tcp_port = -1;
int udp_port = -1;
/*
* We check for both TCP and UDP in case there are
* ambiguous entries.
*/
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
error = getaddrinfo(NULL, name, &hints, &res);
if (error != 0) {
if (error != EAI_NONAME &&
error != EAI_SERVICE) {
/*
* This is a real error, not just "there's
* no such service name".
* XXX - this doesn't return an error string.
*/
return 0;
}
} else {
/*
* OK, we found it. Did it find anything?
*/
for (ai = res; ai != NULL; ai = ai->ai_next) {
/*
* Does it have an address?
*/
if (ai->ai_addr != NULL) {
/*
* Yes. Get a port number; we're done.
*/
if (ai->ai_addr->sa_family == AF_INET) {
in4 = (struct sockaddr_in *)ai->ai_addr;
tcp_port = ntohs(in4->sin_port);
break;
}
#ifdef INET6
if (ai->ai_addr->sa_family == AF_INET6) {
in6 = (struct sockaddr_in6 *)ai->ai_addr;
tcp_port = ntohs(in6->sin6_port);
break;
}
#endif
}
}
freeaddrinfo(res);
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
error = getaddrinfo(NULL, name, &hints, &res);
if (error != 0) {
if (error != EAI_NONAME &&
error != EAI_SERVICE) {
/*
* This is a real error, not just "there's
* no such service name".
* XXX - this doesn't return an error string.
*/
return 0;
}
} else {
/*
* OK, we found it. Did it find anything?
*/
for (ai = res; ai != NULL; ai = ai->ai_next) {
/*
* Does it have an address?
*/
if (ai->ai_addr != NULL) {
/*
* Yes. Get a port number; we're done.
*/
if (ai->ai_addr->sa_family == AF_INET) {
in4 = (struct sockaddr_in *)ai->ai_addr;
udp_port = ntohs(in4->sin_port);
break;
}
#ifdef INET6
if (ai->ai_addr->sa_family == AF_INET6) {
in6 = (struct sockaddr_in6 *)ai->ai_addr;
udp_port = ntohs(in6->sin6_port);
break;
}
#endif
}
}
freeaddrinfo(res);
}
/*
* We need to check /etc/services for ambiguous entries.
* If we find an ambiguous entry, and it has the
* same port number, change the proto to PROTO_UNDEF
* so both TCP and UDP will be checked.
*/
if (tcp_port >= 0) {
*port = tcp_port;
*proto = IPPROTO_TCP;
if (udp_port >= 0) {
if (udp_port == tcp_port)
*proto = PROTO_UNDEF;
#ifdef notdef
else
/* Can't handle ambiguous names that refer
to different port numbers. */
warning("ambiguous port %s in /etc/services",
name);
#endif
}
return 1;
}
if (udp_port >= 0) {
*port = udp_port;
*proto = IPPROTO_UDP;
return 1;
}
#if defined(ultrix) || defined(__osf__)
/* Special hack in case NFS isn't in /etc/services */
if (strcmp(name, "nfs") == 0) {
*port = 2049;
*proto = PROTO_UNDEF;
return 1;
}
#endif
return 0;
}
/*
* Convert a string in the form PPP-PPP, where correspond to ports, to
* a starting and ending port in a port range.
* Return 0 on failure.
*/
int
pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto)
{
char *off, *cpy;
int save_proto;
if ((cpy = strdup(name)) == NULL)
return 0;
if ((off = strchr(cpy, '-')) == NULL) {
free(cpy);
return 0;
}
*off = '\0';
if (pcap_nametoport(cpy, port1, proto) == 0) {
free(cpy);
return 0;
}
save_proto = *proto;
if (pcap_nametoport(off + 1, port2, proto) == 0) {
free(cpy);
return 0;
}
free(cpy);
if (*proto != save_proto)
*proto = PROTO_UNDEF;
return 1;
}
/*
* XXX - not guaranteed to be thread-safe! See below for platforms
* on which it is thread-safe and on which it isn't.
*/
int
pcap_nametoproto(const char *str)
{
struct protoent *p;
#if defined(HAVE_LINUX_GETNETBYNAME_R)
/*
* We have Linux's reentrant getprotobyname_r().
*/
struct protoent result_buf;
char buf[1024]; /* arbitrary size */
int err;
err = getprotobyname_r(str, &result_buf, buf, sizeof buf, &p);
if (err != 0) {
/*
* XXX - dynamically allocate the buffer, and make it
* bigger if we get ERANGE back?
*/
return 0;
}
#elif defined(HAVE_SOLARIS_IRIX_GETNETBYNAME_R)
/*
* We have Solaris's and IRIX's reentrant getprotobyname_r().
*/
struct protoent result_buf;
char buf[1024]; /* arbitrary size */
p = getprotobyname_r(str, &result_buf, buf, (int)sizeof buf);
#elif defined(HAVE_AIX_GETNETBYNAME_R)
/*
* We have AIX's reentrant getprotobyname_r().
*/
struct protoent result_buf;
struct protoent_data proto_data;
if (getprotobyname_r(str, &result_buf, &proto_data) == -1)
p = NULL;
else
p = &result_buf;
#else
/*
* We don't have any getprotobyname_r(); either we have a
* getprotobyname() that uses thread-specific data, in which
* case we're thread-safe (sufficiently recent FreeBSD,
* sufficiently recent Darwin-based OS, sufficiently recent
* HP-UX, sufficiently recent Tru64 UNIX, Windows), or we have
* the traditional getprotobyname() (everything else, including
* current NetBSD and OpenBSD), in which case we're not
* thread-safe.
*/
p = getprotobyname(str);
#endif
if (p != 0)
return p->p_proto;
else
return PROTO_UNDEF;
}
#include "ethertype.h"
struct eproto {
const char *s;
u_short p;
};
/*
* Static data base of ether protocol types.
* tcpdump used to import this, and it's declared as an export on
* Debian, at least, so make it a public symbol, even though we
* don't officially export it by declaring it in a header file.
* (Programs *should* do this themselves, as tcpdump now does.)
*
* We declare it here, right before defining it, to squelch any
* warnings we might get from compilers about the lack of a
* declaration.
*/
PCAP_API struct eproto eproto_db[];
PCAP_API_DEF struct eproto eproto_db[] = {
{ "aarp", ETHERTYPE_AARP },
{ "arp", ETHERTYPE_ARP },
{ "atalk", ETHERTYPE_ATALK },
{ "decnet", ETHERTYPE_DN },
{ "ip", ETHERTYPE_IP },
#ifdef INET6
{ "ip6", ETHERTYPE_IPV6 },
#endif
{ "lat", ETHERTYPE_LAT },
{ "loopback", ETHERTYPE_LOOPBACK },
{ "mopdl", ETHERTYPE_MOPDL },
{ "moprc", ETHERTYPE_MOPRC },
{ "rarp", ETHERTYPE_REVARP },
{ "sca", ETHERTYPE_SCA },
{ (char *)0, 0 }
};
int
pcap_nametoeproto(const char *s)
{
struct eproto *p = eproto_db;
while (p->s != 0) {
if (strcmp(p->s, s) == 0)
return p->p;
p += 1;
}
return PROTO_UNDEF;
}
#include "llc.h"
/* Static data base of LLC values. */
static struct eproto llc_db[] = {
{ "iso", LLCSAP_ISONS },
{ "stp", LLCSAP_8021D },
{ "ipx", LLCSAP_IPX },
{ "netbeui", LLCSAP_NETBEUI },
{ (char *)0, 0 }
};
int
pcap_nametollc(const char *s)
{
struct eproto *p = llc_db;
while (p->s != 0) {
if (strcmp(p->s, s) == 0)
return p->p;
p += 1;
}
return PROTO_UNDEF;
}
/* Hex digit to 8-bit unsigned integer. */
static inline u_char
xdtoi(u_char c)
{
if (c >= '0' && c <= '9')
return (u_char)(c - '0');
else if (c >= 'a' && c <= 'f')
return (u_char)(c - 'a' + 10);
else
return (u_char)(c - 'A' + 10);
}
int
__pcap_atoin(const char *s, bpf_u_int32 *addr)
{
u_int n;
int len;
*addr = 0;
len = 0;
for (;;) {
n = 0;
while (*s && *s != '.') {
if (n > 25) {
/* The result will be > 255 */
return -1;
}
n = n * 10 + *s++ - '0';
}
if (n > 255)
return -1;
*addr <<= 8;
*addr |= n & 0xff;
len += 8;
if (*s == '\0')
return len;
++s;
}
/* NOTREACHED */
}
int
__pcap_atodn(const char *s, bpf_u_int32 *addr)
{
#define AREASHIFT 10
#define AREAMASK 0176000
#define NODEMASK 01777
u_int node, area;
if (sscanf(s, "%d.%d", &area, &node) != 2)
return(0);
*addr = (area << AREASHIFT) & AREAMASK;
*addr |= (node & NODEMASK);
return(32);
}
/*
* Convert 's', which can have the one of the forms:
*
* "xx:xx:xx:xx:xx:xx"
* "xx.xx.xx.xx.xx.xx"
* "xx-xx-xx-xx-xx-xx"
* "xxxx.xxxx.xxxx"
* "xxxxxxxxxxxx"
*
* (or various mixes of ':', '.', and '-') into a new
* ethernet address. Assumes 's' is well formed.
*/
u_char *
pcap_ether_aton(const char *s)
{
register u_char *ep, *e;
register u_char d;
e = ep = (u_char *)malloc(6);
if (e == NULL)
return (NULL);
while (*s) {
if (*s == ':' || *s == '.' || *s == '-')
s += 1;
d = xdtoi(*s++);
if (PCAP_ISXDIGIT(*s)) {
d <<= 4;
d |= xdtoi(*s++);
}
*ep++ = d;
}
return (e);
}
#ifndef HAVE_ETHER_HOSTTON
/*
* Roll our own.
*
* This should be thread-safe, as we define the static variables
* we use to be thread-local, and as pcap_next_etherent() does so
* as well.
*/
u_char *
pcap_ether_hostton(const char *name)
{
register struct pcap_etherent *ep;
register u_char *ap;
static thread_local FILE *fp = NULL;
static thread_local int init = 0;
if (!init) {
fp = fopen(PCAP_ETHERS_FILE, "r");
++init;
if (fp == NULL)
return (NULL);
} else if (fp == NULL)
return (NULL);
else
rewind(fp);
while ((ep = pcap_next_etherent(fp)) != NULL) {
if (strcmp(ep->name, name) == 0) {
ap = (u_char *)malloc(6);
if (ap != NULL) {
memcpy(ap, ep->addr, 6);
return (ap);
}
break;
}
}
return (NULL);
}
#else
/*
* Use the OS-supplied routine.
* This *should* be thread-safe; the API doesn't have a static buffer.
*/
u_char *
pcap_ether_hostton(const char *name)
{
register u_char *ap;
u_char a[6];
char namebuf[1024];
/*
* In AIX 7.1 and 7.2: int ether_hostton(char *, struct ether_addr *);
*/
pcapint_strlcpy(namebuf, name, sizeof(namebuf));
ap = NULL;
if (ether_hostton(namebuf, (struct ether_addr *)a) == 0) {
ap = (u_char *)malloc(6);
if (ap != NULL)
memcpy((char *)ap, (char *)a, 6);
}
return (ap);
}
#endif
/*
* XXX - not guaranteed to be thread-safe!
*/
int
#ifdef DECNETLIB
__pcap_nametodnaddr(const char *name, u_short *res)
{
struct nodeent *getnodebyname();
struct nodeent *nep;
nep = getnodebyname(name);
if (nep == ((struct nodeent *)0))
return(0);
memcpy((char *)res, (char *)nep->n_addr, sizeof(unsigned short));
return(1);
#else
__pcap_nametodnaddr(const char *name _U_, u_short *res _U_)
{
return(0);
#endif
}
