/*

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#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 <ctype.h>

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include "pcap-int.h"

#include "gencode.h"

#include <pcap/namedb.h>

#include "nametoaddr.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;

	if ((hp = gethostbyname(name)) != NULL) {

#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.

 */

bpf_u_int32

pcap_nametonetaddr(const char *name)

{

#ifdef _WIN32

	/*

	 * 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

	/*

	 * 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)

{

	u_int p1, p2;

	char *off, *cpy;

	int save_proto;

	if (sscanf(name, "%d-%d", &p1, &p2) != 2) {

		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;

	} else {

		*port1 = p1;

		*port2 = p2;

		*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[] = {

	{ "pup", ETHERTYPE_PUP },

	{ "xns", ETHERTYPE_NS },

	{ "ip", ETHERTYPE_IP },

#ifdef INET6

	{ "ip6", ETHERTYPE_IPV6 },

#endif

	{ "arp", ETHERTYPE_ARP },

	{ "rarp", ETHERTYPE_REVARP },

	{ "sprite", ETHERTYPE_SPRITE },

	{ "mopdl", ETHERTYPE_MOPDL },

	{ "moprc", ETHERTYPE_MOPRC },

	{ "decnet", ETHERTYPE_DN },

	{ "lat", ETHERTYPE_LAT },

	{ "sca", ETHERTYPE_SCA },

	{ "lanbridge", ETHERTYPE_LANBRIDGE },

	{ "vexp", ETHERTYPE_VEXP },

	{ "vprod", ETHERTYPE_VPROD },

	{ "atalk", ETHERTYPE_ATALK },

	{ "atalkarp", ETHERTYPE_AARP },

	{ "loopback", ETHERTYPE_LOOPBACK },

	{ "decdts", ETHERTYPE_DECDTS },

	{ "decdns", ETHERTYPE_DECDNS },

	{ (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 (isdigit(c))

		return (u_char)(c - '0');

	else if (islower(c))

		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 != '.')

			n = n * 10 + *s++ - '0';

		*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 (isxdigit((unsigned char)*s)) {

			d <<= 4;

			d |= xdtoi(*s++);

		}

		*ep++ = d;

	}

	return (e);

}

#ifndef HAVE_ETHER_HOSTTON

/*

 * Roll our own.

 * XXX - not thread-safe, because pcap_next_etherent() isn't thread-

 * safe!  Needs a mutex or a thread-safe pcap_next_etherent().

 */

u_char *

pcap_ether_hostton(const char *name)

{

	register struct pcap_etherent *ep;

	register u_char *ap;

	static FILE *fp = NULL;

	static 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];

	ap = NULL;

	if (ether_hostton(name, (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

}