[apple/network_cmds.git] / unbound / compat / fake-rfc2553.c

/* From openssh 4.3p2 filename openbsd-compat/fake-rfc2553.h */
/*
 * 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 <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "compat/fake-rfc2553.h"

#ifndef HAVE_GETNAMEINFO
int getnameinfo(const struct sockaddr *sa, size_t ATTR_UNUSED(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 = calloc(1, sizeof(*ai) + sizeof(struct sockaddr_in));
	if (ai == NULL)
		return (NULL);
	
	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
89c4ed63 A	1	/* From openssh 4.3p2 filename openbsd-compat/fake-rfc2553.h */
	2	/*
	3	* Copyright (C) 2000-2003 Damien Miller. All rights reserved.
	4	* Copyright (C) 1999 WIDE Project. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. Neither the name of the project nor the names of its contributors
	15	* may be used to endorse or promote products derived from this software
	16	* without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	19	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	22	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	23	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	24	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	26	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	27	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	28	* SUCH DAMAGE.
	29	*/
	30
	31	/*
	32	* Pseudo-implementation of RFC2553 name / address resolution functions
	33	*
	34	* But these functions are not implemented correctly. The minimum subset
	35	* is implemented for ssh use only. For example, this routine assumes
	36	* that ai_family is AF_INET. Don't use it for another purpose.
	37	*/
	38
	39	#include <unistd.h>
	40	#include <string.h>
	41	#include <stdio.h>
	42	#include <stdlib.h>
	43	#include "compat/fake-rfc2553.h"
	44
	45	#ifndef HAVE_GETNAMEINFO
	46	int getnameinfo(const struct sockaddr sa, size_t ATTR_UNUSED(salen), char host,
	47	size_t hostlen, char *serv, size_t servlen, int flags)
	48	{
	49	struct sockaddr_in sin = (struct sockaddr_in )sa;
	50	struct hostent *hp;
	51	char tmpserv[16];
	52
	53	if (serv != NULL) {
	54	snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
	55	if (strlcpy(serv, tmpserv, servlen) >= servlen)
	56	return (EAI_MEMORY);
	57	}
	58
	59	if (host != NULL) {
	60	if (flags & NI_NUMERICHOST) {
	61	if (strlcpy(host, inet_ntoa(sin->sin_addr),
	62	hostlen) >= hostlen)
	63	return (EAI_MEMORY);
	64	else
65	return (0);
66	} else {
67	hp = gethostbyaddr((char *)&sin->sin_addr,
68	sizeof(struct in_addr), AF_INET);
69	if (hp == NULL)
70	return (EAI_NODATA);
71
72	if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
73	return (EAI_MEMORY);
74	else
75	return (0);
76	}
77	}
78	return (0);
79	}
80	#endif /* !HAVE_GETNAMEINFO */
81
82	#ifndef HAVE_GAI_STRERROR
83	#ifdef HAVE_CONST_GAI_STRERROR_PROTO
84	const char *
85	#else
86	char *
87	#endif
88	gai_strerror(int err)
89	{
90	switch (err) {
91	case EAI_NODATA:
92	return ("no address associated with name");
93	case EAI_MEMORY:
94	return ("memory allocation failure.");
95	case EAI_NONAME:
96	return ("nodename nor servname provided, or not known");
97	default:
98	return ("unknown/invalid error.");
99	}
100	}
101	#endif /* !HAVE_GAI_STRERROR */
102
103	#ifndef HAVE_FREEADDRINFO
104	void
105	freeaddrinfo(struct addrinfo *ai)
106	{
107	struct addrinfo *next;
108
109	for(; ai != NULL;) {
110	next = ai->ai_next;
111	free(ai);
112	ai = next;
113	}
114	}
115	#endif /* !HAVE_FREEADDRINFO */
116
117	#ifndef HAVE_GETADDRINFO
118	static struct
119	addrinfo malloc_ai(int port, u_long addr, const struct addrinfo hints)
120	{
121	struct addrinfo *ai;
122
123	ai = calloc(1, sizeof(*ai) + sizeof(struct sockaddr_in));
124	if (ai == NULL)
125	return (NULL);
126
127	ai->ai_addr = (struct sockaddr *)(ai + 1);
128	/* XXX -- ssh doesn't use sa_len */
129	ai->ai_addrlen = sizeof(struct sockaddr_in);
130	ai->ai_addr->sa_family = ai->ai_family = AF_INET;
131
132	((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
133	((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
134
135	/* XXX: the following is not generally correct, but does what we want */
136	if (hints->ai_socktype)
137	ai->ai_socktype = hints->ai_socktype;
138	else
139	ai->ai_socktype = SOCK_STREAM;
140
141	if (hints->ai_protocol)
142	ai->ai_protocol = hints->ai_protocol;
143
144	return (ai);
145	}
146
147	int
148	getaddrinfo(const char hostname, const char servname,
149	const struct addrinfo hints, struct addrinfo *res)
150	{
151	struct hostent *hp;
152	struct servent *sp;
153	struct in_addr in;
154	int i;
155	long int port;
156	u_long addr;
157
158	port = 0;
159	if (servname != NULL) {
160	char *cp;
161
162	port = strtol(servname, &cp, 10);
163	if (port > 0 && port <= 65535 && *cp == '\0')
164	port = htons(port);
165	else if ((sp = getservbyname(servname, NULL)) != NULL)
166	port = sp->s_port;
167	else
168	port = 0;
169	}
170
171	if (hints && hints->ai_flags & AI_PASSIVE) {
172	addr = htonl(0x00000000);
173	if (hostname && inet_aton(hostname, &in) != 0)
174	addr = in.s_addr;
175	*res = malloc_ai(port, addr, hints);
176	if (*res == NULL)
177	return (EAI_MEMORY);
178	return (0);
179	}
180
181	if (!hostname) {
182	*res = malloc_ai(port, htonl(0x7f000001), hints);
183	if (*res == NULL)
184	return (EAI_MEMORY);
185	return (0);
186	}
187
188	if (inet_aton(hostname, &in)) {
189	*res = malloc_ai(port, in.s_addr, hints);
190	if (*res == NULL)
191	return (EAI_MEMORY);
192	return (0);
193	}
194
195	/* Don't try DNS if AI_NUMERICHOST is set */
196	if (hints && hints->ai_flags & AI_NUMERICHOST)
197	return (EAI_NONAME);
198
199	hp = gethostbyname(hostname);
200	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
201	struct addrinfo cur, prev;
202
203	cur = prev = *res = NULL;
204	for (i = 0; hp->h_addr_list[i]; i++) {
205	struct in_addr in = (struct in_addr )hp->h_addr_list[i];
206
207	cur = malloc_ai(port, in->s_addr, hints);
208	if (cur == NULL) {
209	if (*res != NULL)
210	freeaddrinfo(*res);
211	return (EAI_MEMORY);
212	}
213	if (prev)
214	prev->ai_next = cur;
215	else
216	*res = cur;
217
218	prev = cur;
219	}
220	return (0);
221	}
222
223	return (EAI_NODATA);
224	}
225	#endif /* !HAVE_GETADDRINFO */