[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)
{
	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;
	
	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 in_addr in;
	int i, port;

	if (servname)
		port = htons(atoi(servname));
	else
		port = 0;

	if (hints && hints->ai_flags & AI_PASSIVE) {
		if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
			return 0;
		else
			return EAI_MEMORY;
	}
		
	if (!hostname) {
		if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
			return 0;
		else
			return EAI_MEMORY;
	}
	
	if (inet_aton(hostname, &in)) {
		if (NULL != (*res = malloc_ai(port, in.s_addr)))
			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);
			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
5daf7064	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
5daf7064	44	static struct addrinfo *malloc_ai(int port, u_long addr)
48e671d5	45	{
5daf7064	46	struct addrinfo *ai;
	47
	48	ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
	49	if (ai == NULL)
	50	return(NULL);
	51
	52	memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
	53
	54	ai->ai_addr = (struct sockaddr *)(ai + 1);
	55	/* XXX -- ssh doesn't use sa_len */
	56	ai->ai_addrlen = sizeof(struct sockaddr_in);
	57	ai->ai_addr->sa_family = ai->ai_family = AF_INET;
48e671d5	58
5daf7064	59	((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
	60	((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
	61
	62	return(ai);
48e671d5	63	}
48e671d5	64
5daf7064	65	int getaddrinfo(const char hostname, const char servname,
5daf7064	66	const struct addrinfo hints, struct addrinfo *res)
48e671d5	67	{
5daf7064	68	struct addrinfo cur, prev = NULL;
5daf7064	69	struct hostent *hp;
9c13d877	70	struct in_addr in;
5daf7064	71	int i, port;
	72
	73	if (servname)
	74	port = htons(atoi(servname));
48e671d5	75	else
5daf7064	76	port = 0;
	77
	78	if (hints && hints->ai_flags & AI_PASSIVE) {
	79	if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
	80	return 0;
	81	else
	82	return EAI_MEMORY;
	83	}
	84
	85	if (!hostname) {
	86	if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
	87	return 0;
	88	else
	89	return EAI_MEMORY;
	90	}
	91
dc2a6d09	92	if (inet_aton(hostname, &in)) {
9c13d877	93	if (NULL != (*res = malloc_ai(port, in.s_addr)))
5daf7064	94	return 0;
	95	else
	96	return EAI_MEMORY;
	97	}
	98
	99	hp = gethostbyname(hostname);
	100	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
	101	for (i = 0; hp->h_addr_list[i]; i++) {
	102	cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
	103	if (cur == NULL) {
	104	if (*res)
	105	freeaddrinfo(*res);
	106	return EAI_MEMORY;
	107	}
	108
	109	if (prev)
	110	prev->ai_next = cur;
	111	else
	112	*res = cur;
	113
	114	prev = cur;
	115	}
	116	return 0;
	117	}
	118
	119	return EAI_NODATA;
48e671d5	120	}
48e671d5	121	#endif /* !HAVE_GETADDRINFO */