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

/*
 * fake library for ssh
 *
 * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
 * These funtions are defined in rfc2133.
 *
 * But these functions are not implemented correctly. The minimum subset
 * is implemented for ssh use only. For exapmle, this routine assumes
 * that ai_family is AF_INET. Don't use it for another purpose.
 */

#include "includes.h"
#include "ssh.h"

RCSID("$Id$");

#ifndef HAVE_GAI_STRERROR
char *gai_strerror(int ecode)
{
	switch (ecode) {
		case EAI_NODATA:
			return "no address associated with hostname.";
		case EAI_MEMORY:
			return "memory allocation failure.";
		default:
			return "unknown error.";
	}
}    
#endif /* !HAVE_GAI_STRERROR */

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

	do {
		next = ai->ai_next;
		free(ai);
	} while (NULL != (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(struct addrinfo) + sizeof(struct sockaddr_in));
	if (ai == NULL)
		return(NULL);
	
	memset(ai, 0, sizeof(struct addrinfo) + 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 addrinfo *cur, *prev = NULL;
	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;
		if (NULL != (*res = malloc_ai(port, addr, hints)))
			return 0;
		else
			return EAI_MEMORY;
	}
		
	if (!hostname) {
		if (NULL != (*res = malloc_ai(port, htonl(0x7f000001), hints)))
			return 0;
		else
			return EAI_MEMORY;
	}
	
	if (inet_aton(hostname, &in)) {
		if (NULL != (*res = malloc_ai(port, in.s_addr, hints)))
			return 0;
		else
			return EAI_MEMORY;
	}
	
	hp = gethostbyname(hostname);
	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
		for (i = 0; hp->h_addr_list[i]; i++) {
			cur = malloc_ai(port,
			    ((struct in_addr *)hp->h_addr_list[i])->s_addr, hints);
			if (cur == NULL) {
				if (*res)
					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
48e671d5	1	/*
	2	* fake library for ssh
	3	*
	4	* This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
	5	* These funtions are defined in rfc2133.
	6	*
	7	* But these functions are not implemented correctly. The minimum subset
	8	* is implemented for ssh use only. For exapmle, this routine assumes
	9	* that ai_family is AF_INET. Don't use it for another purpose.
48e671d5	10	*/
	11
	12	#include "includes.h"
	13	#include "ssh.h"
	14
0b202697	15	RCSID("$Id$");
0b202697	16
48e671d5	17	#ifndef HAVE_GAI_STRERROR
4a35ae8b	18	char *gai_strerror(int ecode)
48e671d5	19	{
5daf7064	20	switch (ecode) {
	21	case EAI_NODATA:
	22	return "no address associated with hostname.";
	23	case EAI_MEMORY:
	24	return "memory allocation failure.";
	25	default:
	26	return "unknown error.";
	27	}
48e671d5	28	}
	29	#endif /* !HAVE_GAI_STRERROR */
	30
	31	#ifndef HAVE_FREEADDRINFO
5daf7064	32	void freeaddrinfo(struct addrinfo *ai)
48e671d5	33	{
5daf7064	34	struct addrinfo *next;
	35
	36	do {
	37	next = ai->ai_next;
	38	free(ai);
	39	} while (NULL != (ai = next));
48e671d5	40	}
	41	#endif /* !HAVE_FREEADDRINFO */
	42
	43	#ifndef HAVE_GETADDRINFO
b1848832	44	static struct addrinfo *malloc_ai(int port, u_long addr,
b1848832	45	const struct addrinfo *hints)
48e671d5	46	{
5daf7064	47	struct addrinfo *ai;
	48
	49	ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
	50	if (ai == NULL)
	51	return(NULL);
	52
	53	memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
	54
	55	ai->ai_addr = (struct sockaddr *)(ai + 1);
	56	/* XXX -- ssh doesn't use sa_len */
	57	ai->ai_addrlen = sizeof(struct sockaddr_in);
	58	ai->ai_addr->sa_family = ai->ai_family = AF_INET;
48e671d5	59
5daf7064	60	((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
	61	((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
	62
b1848832	63	/* XXX: the following is not generally correct, but does what we want */
	64	if (hints->ai_socktype)
	65	ai->ai_socktype = hints->ai_socktype;
	66	else
	67	ai->ai_socktype = SOCK_STREAM;
	68
	69	if (hints->ai_protocol)
	70	ai->ai_protocol = hints->ai_protocol;
	71
5daf7064	72	return(ai);
48e671d5	73	}
48e671d5	74
5daf7064	75	int getaddrinfo(const char hostname, const char servname,
5daf7064	76	const struct addrinfo hints, struct addrinfo *res)
48e671d5	77	{
5daf7064	78	struct addrinfo cur, prev = NULL;
5daf7064	79	struct hostent *hp;
ecc03386	80	struct servent *sp;
9c13d877	81	struct in_addr in;
ecc03386	82	int i;
ecc03386	83	long int port;
62086365	84	u_long addr;
5daf7064	85
ecc03386	86	port = 0;
	87	if (servname != NULL) {
	88	char *cp;
	89
	90	port = strtol(servname, &cp, 10);
	91	if (port > 0 && port <= 65535 && *cp == '\0')
	92	port = htons(port);
	93	else if ((sp = getservbyname(servname, NULL)) != NULL)
	94	port = sp->s_port;
	95	else
	96	port = 0;
	97	}
5daf7064	98
5daf7064	99	if (hints && hints->ai_flags & AI_PASSIVE) {
62086365	100	addr = htonl(0x00000000);
	101	if (hostname && inet_aton(hostname, &in) != 0)
	102	addr = in.s_addr;
b1848832	103	if (NULL != (*res = malloc_ai(port, addr, hints)))
5daf7064	104	return 0;
	105	else
	106	return EAI_MEMORY;
	107	}
	108
	109	if (!hostname) {
b1848832	110	if (NULL != (*res = malloc_ai(port, htonl(0x7f000001), hints)))
5daf7064	111	return 0;
	112	else
	113	return EAI_MEMORY;
	114	}
	115
dc2a6d09	116	if (inet_aton(hostname, &in)) {
b1848832	117	if (NULL != (*res = malloc_ai(port, in.s_addr, hints)))
5daf7064	118	return 0;
	119	else
	120	return EAI_MEMORY;
	121	}
	122
	123	hp = gethostbyname(hostname);
	124	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
	125	for (i = 0; hp->h_addr_list[i]; i++) {
b1848832	126	cur = malloc_ai(port,
b1848832	127	((struct in_addr *)hp->h_addr_list[i])->s_addr, hints);
5daf7064	128	if (cur == NULL) {
	129	if (*res)
	130	freeaddrinfo(*res);
	131	return EAI_MEMORY;
	132	}
	133
	134	if (prev)
	135	prev->ai_next = cur;
	136	else
	137	*res = cur;
	138
	139	prev = cur;
	140	}
	141	return 0;
	142	}
	143
	144	return EAI_NODATA;
48e671d5	145	}
48e671d5	146	#endif /* !HAVE_GETADDRINFO */