[openssh.git] / openbsd-compat / fake-rfc2553.c

/*
 * Copyright (C) 2000-2003 Damien Miller.  All rights reserved.
 * Copyright (C) 1999 WIDE Project.  All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Pseudo-implementation of RFC2553 name / address resolution functions
 *
 * But these functions are not implemented correctly. The minimum subset
 * is implemented for ssh use only. For example, this routine assumes
 * that ai_family is AF_INET. Don't use it for another purpose.
 */

#include "includes.h"

#include <stdlib.h>
#include <string.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#ifndef HAVE_GETNAMEINFO
int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, 
                size_t hostlen, char *serv, size_t servlen, int flags)
{
	struct sockaddr_in *sin = (struct sockaddr_in *)sa;
	struct hostent *hp;
	char tmpserv[16];

	if (serv != NULL) {
		snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
		if (strlcpy(serv, tmpserv, servlen) >= servlen)
			return (EAI_MEMORY);
	}

	if (host != NULL) {
		if (flags & NI_NUMERICHOST) {
			if (strlcpy(host, inet_ntoa(sin->sin_addr),
			    hostlen) >= hostlen)
				return (EAI_MEMORY);
			else
				return (0);
		} else {
			hp = gethostbyaddr((char *)&sin->sin_addr, 
			    sizeof(struct in_addr), AF_INET);
			if (hp == NULL)
				return (EAI_NODATA);
			
			if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
				return (EAI_MEMORY);
			else
				return (0);
		}
	}
	return (0);
}
#endif /* !HAVE_GETNAMEINFO */

#ifndef HAVE_GAI_STRERROR
#ifdef HAVE_CONST_GAI_STRERROR_PROTO
const char *
#else
char *
#endif
gai_strerror(int err)
{
	switch (err) {
	case EAI_NODATA:
		return ("no address associated with name");
	case EAI_MEMORY:
		return ("memory allocation failure.");
	case EAI_NONAME:
		return ("nodename nor servname provided, or not known");
	default:
		return ("unknown/invalid error.");
	}
}    
#endif /* !HAVE_GAI_STRERROR */

#ifndef HAVE_FREEADDRINFO
void
freeaddrinfo(struct addrinfo *ai)
{
	struct addrinfo *next;

	for(; ai != NULL;) {
		next = ai->ai_next;
		free(ai);
		ai = next;
	}
}
#endif /* !HAVE_FREEADDRINFO */

#ifndef HAVE_GETADDRINFO
static struct
addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints)
{
	struct addrinfo *ai;

	ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in));
	if (ai == NULL)
		return (NULL);
	
	memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in));
	
	ai->ai_addr = (struct sockaddr *)(ai + 1);
	/* XXX -- ssh doesn't use sa_len */
	ai->ai_addrlen = sizeof(struct sockaddr_in);
	ai->ai_addr->sa_family = ai->ai_family = AF_INET;

	((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
	((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
	
	/* XXX: the following is not generally correct, but does what we want */
	if (hints->ai_socktype)
		ai->ai_socktype = hints->ai_socktype;
	else
		ai->ai_socktype = SOCK_STREAM;

	if (hints->ai_protocol)
		ai->ai_protocol = hints->ai_protocol;

	return (ai);
}

int
getaddrinfo(const char *hostname, const char *servname, 
    const struct addrinfo *hints, struct addrinfo **res)
{
	struct hostent *hp;
	struct servent *sp;
	struct in_addr in;
	int i;
	long int port;
	u_long addr;

	port = 0;
	if (servname != NULL) {
		char *cp;

		port = strtol(servname, &cp, 10);
		if (port > 0 && port <= 65535 && *cp == '\0')
			port = htons(port);
		else if ((sp = getservbyname(servname, NULL)) != NULL)
			port = sp->s_port;
		else
			port = 0;
	}

	if (hints && hints->ai_flags & AI_PASSIVE) {
		addr = htonl(0x00000000);
		if (hostname && inet_aton(hostname, &in) != 0)
			addr = in.s_addr;
		*res = malloc_ai(port, addr, hints);
		if (*res == NULL) 
			return (EAI_MEMORY);
		return (0);
	}
		
	if (!hostname) {
		*res = malloc_ai(port, htonl(0x7f000001), hints);
		if (*res == NULL) 
			return (EAI_MEMORY);
		return (0);
	}
	
	if (inet_aton(hostname, &in)) {
		*res = malloc_ai(port, in.s_addr, hints);
		if (*res == NULL) 
			return (EAI_MEMORY);
		return (0);
	}
	
	/* Don't try DNS if AI_NUMERICHOST is set */
	if (hints && hints->ai_flags & AI_NUMERICHOST)
		return (EAI_NONAME);
	
	hp = gethostbyname(hostname);
	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
		struct addrinfo *cur, *prev;

		cur = prev = *res = NULL;
		for (i = 0; hp->h_addr_list[i]; i++) {
			struct in_addr *in = (struct in_addr *)hp->h_addr_list[i];

			cur = malloc_ai(port, in->s_addr, hints);
			if (cur == NULL) {
				if (*res != NULL)
					freeaddrinfo(*res);
				return (EAI_MEMORY);
			}
			if (prev)
				prev->ai_next = cur;
			else
				*res = cur;

			prev = cur;
		}
		return (0);
	}
	
	return (EAI_NODATA);
}
#endif /* !HAVE_GETADDRINFO */
Commit	Line	Data
f5827134	1	/*
	2	* Copyright (C) 2000-2003 Damien Miller. All rights reserved.
	3	* Copyright (C) 1999 WIDE Project. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. Neither the name of the project nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
48e671d5	30	/*
52d58495	31	* Pseudo-implementation of RFC2553 name / address resolution functions
48e671d5	32	*
48e671d5	33	* But these functions are not implemented correctly. The minimum subset
5e24e4a5	34	* is implemented for ssh use only. For example, this routine assumes
48e671d5	35	* that ai_family is AF_INET. Don't use it for another purpose.
48e671d5	36	*/
48e671d5	37
4ed465ec	38	#include "includes.h"
f8688ddd	39
f8688ddd	40	#include <stdlib.h>
e204f3ee	41	#include <string.h>
4ed465ec	42
e3220bb2	43	#include <netinet/in.h>
	44	#include <arpa/inet.h>
	45
52d58495	46	#ifndef HAVE_GETNAMEINFO
	47	int getnameinfo(const struct sockaddr sa, size_t salen, char host,
	48	size_t hostlen, char *serv, size_t servlen, int flags)
	49	{
	50	struct sockaddr_in sin = (struct sockaddr_in )sa;
	51	struct hostent *hp;
	52	char tmpserv[16];
	53
	54	if (serv != NULL) {
	55	snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
	56	if (strlcpy(serv, tmpserv, servlen) >= servlen)
	57	return (EAI_MEMORY);
	58	}
	59
	60	if (host != NULL) {
	61	if (flags & NI_NUMERICHOST) {
	62	if (strlcpy(host, inet_ntoa(sin->sin_addr),
	63	hostlen) >= hostlen)
	64	return (EAI_MEMORY);
	65	else
	66	return (0);
	67	} else {
	68	hp = gethostbyaddr((char *)&sin->sin_addr,
	69	sizeof(struct in_addr), AF_INET);
	70	if (hp == NULL)
	71	return (EAI_NODATA);
	72
	73	if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
	74	return (EAI_MEMORY);
	75	else
	76	return (0);
	77	}
	78	}
	79	return (0);
	80	}
	81	#endif /* !HAVE_GETNAMEINFO */
	82
48e671d5	83	#ifndef HAVE_GAI_STRERROR
1a086f97	84	#ifdef HAVE_CONST_GAI_STRERROR_PROTO
	85	const char *
	86	#else
9901cb37	87	char *
1a086f97	88	#endif
9901cb37	89	gai_strerror(int err)
48e671d5	90	{
9901cb37	91	switch (err) {
	92	case EAI_NODATA:
	93	return ("no address associated with name");
	94	case EAI_MEMORY:
	95	return ("memory allocation failure.");
02e2a074	96	case EAI_NONAME:
02e2a074	97	return ("nodename nor servname provided, or not known");
9901cb37	98	default:
9901cb37	99	return ("unknown/invalid error.");
5daf7064	100	}
48e671d5	101	}
	102	#endif /* !HAVE_GAI_STRERROR */
	103
	104	#ifndef HAVE_FREEADDRINFO
9901cb37	105	void
9901cb37	106	freeaddrinfo(struct addrinfo *ai)
48e671d5	107	{
5daf7064	108	struct addrinfo *next;
5daf7064	109
0509a052	110	for(; ai != NULL;) {
0509a052	111	next = ai->ai_next;
5daf7064	112	free(ai);
9901cb37	113	ai = next;
9901cb37	114	}
48e671d5	115	}
	116	#endif /* !HAVE_FREEADDRINFO */
	117
	118	#ifndef HAVE_GETADDRINFO
9901cb37	119	static struct
9901cb37	120	addrinfo malloc_ai(int port, u_long addr, const struct addrinfo hints)
48e671d5	121	{
5daf7064	122	struct addrinfo *ai;
5daf7064	123
d6bd2b5a	124	ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in));
	125	if (ai == NULL)
	126	return (NULL);
5daf7064	127
9901cb37	128	memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in));
5daf7064	129
	130	ai->ai_addr = (struct sockaddr *)(ai + 1);
	131	/* XXX -- ssh doesn't use sa_len */
	132	ai->ai_addrlen = sizeof(struct sockaddr_in);
	133	ai->ai_addr->sa_family = ai->ai_family = AF_INET;
48e671d5	134
5daf7064	135	((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
	136	((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
	137
b1848832	138	/* XXX: the following is not generally correct, but does what we want */
	139	if (hints->ai_socktype)
	140	ai->ai_socktype = hints->ai_socktype;
	141	else
	142	ai->ai_socktype = SOCK_STREAM;
	143
	144	if (hints->ai_protocol)
	145	ai->ai_protocol = hints->ai_protocol;
	146
9901cb37	147	return (ai);
48e671d5	148	}
48e671d5	149
9901cb37	150	int
	151	getaddrinfo(const char hostname, const char servname,
	152	const struct addrinfo hints, struct addrinfo *res)
48e671d5	153	{
5daf7064	154	struct hostent *hp;
ecc03386	155	struct servent *sp;
9c13d877	156	struct in_addr in;
ecc03386	157	int i;
ecc03386	158	long int port;
62086365	159	u_long addr;
5daf7064	160
ecc03386	161	port = 0;
	162	if (servname != NULL) {
	163	char *cp;
	164
	165	port = strtol(servname, &cp, 10);
	166	if (port > 0 && port <= 65535 && *cp == '\0')
	167	port = htons(port);
	168	else if ((sp = getservbyname(servname, NULL)) != NULL)
	169	port = sp->s_port;
	170	else
	171	port = 0;
	172	}
5daf7064	173
5daf7064	174	if (hints && hints->ai_flags & AI_PASSIVE) {
62086365	175	addr = htonl(0x00000000);
	176	if (hostname && inet_aton(hostname, &in) != 0)
	177	addr = in.s_addr;
9901cb37	178	*res = malloc_ai(port, addr, hints);
d6bd2b5a	179	if (*res == NULL)
d6bd2b5a	180	return (EAI_MEMORY);
9901cb37	181	return (0);
5daf7064	182	}
	183
	184	if (!hostname) {
9901cb37	185	*res = malloc_ai(port, htonl(0x7f000001), hints);
d6bd2b5a	186	if (*res == NULL)
d6bd2b5a	187	return (EAI_MEMORY);
9901cb37	188	return (0);
5daf7064	189	}
5daf7064	190
dc2a6d09	191	if (inet_aton(hostname, &in)) {
9901cb37	192	*res = malloc_ai(port, in.s_addr, hints);
d6bd2b5a	193	if (*res == NULL)
d6bd2b5a	194	return (EAI_MEMORY);
9901cb37	195	return (0);
5daf7064	196	}
5daf7064	197
02e2a074	198	/* Don't try DNS if AI_NUMERICHOST is set */
	199	if (hints && hints->ai_flags & AI_NUMERICHOST)
	200	return (EAI_NONAME);
	201
5daf7064	202	hp = gethostbyname(hostname);
5daf7064	203	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
9901cb37	204	struct addrinfo cur, prev;
9901cb37	205
d6bd2b5a	206	cur = prev = *res = NULL;
5daf7064	207	for (i = 0; hp->h_addr_list[i]; i++) {
9901cb37	208	struct in_addr in = (struct in_addr )hp->h_addr_list[i];
	209
	210	cur = malloc_ai(port, in->s_addr, hints);
d6bd2b5a	211	if (cur == NULL) {
	212	if (*res != NULL)
	213	freeaddrinfo(*res);
	214	return (EAI_MEMORY);
	215	}
5daf7064	216	if (prev)
	217	prev->ai_next = cur;
	218	else
	219	*res = cur;
	220
	221	prev = cur;
	222	}
9901cb37	223	return (0);
5daf7064	224	}
5daf7064	225
9901cb37	226	return (EAI_NODATA);
48e671d5	227	}
48e671d5	228	#endif /* !HAVE_GETADDRINFO */