[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"

#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
	15	#ifndef HAVE_GAI_STRERROR
5daf7064	16	char *gai_strerror(int ecode)
48e671d5	17	{
5daf7064	18	switch (ecode) {
	19	case EAI_NODATA:
	20	return "no address associated with hostname.";
	21	case EAI_MEMORY:
	22	return "memory allocation failure.";
	23	default:
	24	return "unknown error.";
	25	}
48e671d5	26	}
	27	#endif /* !HAVE_GAI_STRERROR */
	28
	29	#ifndef HAVE_FREEADDRINFO
5daf7064	30	void freeaddrinfo(struct addrinfo *ai)
48e671d5	31	{
5daf7064	32	struct addrinfo *next;
	33
	34	do {
	35	next = ai->ai_next;
	36	free(ai);
	37	} while (NULL != (ai = next));
48e671d5	38	}
	39	#endif /* !HAVE_FREEADDRINFO */
	40
	41	#ifndef HAVE_GETADDRINFO
5daf7064	42	static struct addrinfo *malloc_ai(int port, u_long addr)
48e671d5	43	{
5daf7064	44	struct addrinfo *ai;
	45
	46	ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
	47	if (ai == NULL)
	48	return(NULL);
	49
	50	memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
	51
	52	ai->ai_addr = (struct sockaddr *)(ai + 1);
	53	/* XXX -- ssh doesn't use sa_len */
	54	ai->ai_addrlen = sizeof(struct sockaddr_in);
	55	ai->ai_addr->sa_family = ai->ai_family = AF_INET;
48e671d5	56
5daf7064	57	((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
	58	((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
	59
	60	return(ai);
48e671d5	61	}
48e671d5	62
5daf7064	63	int getaddrinfo(const char hostname, const char servname,
5daf7064	64	const struct addrinfo hints, struct addrinfo *res)
48e671d5	65	{
5daf7064	66	struct addrinfo cur, prev = NULL;
5daf7064	67	struct hostent *hp;
9c13d877	68	struct in_addr in;
5daf7064	69	int i, port;
	70
	71	if (servname)
	72	port = htons(atoi(servname));
48e671d5	73	else
5daf7064	74	port = 0;
	75
	76	if (hints && hints->ai_flags & AI_PASSIVE) {
	77	if (NULL != (*res = malloc_ai(port, htonl(0x00000000))))
	78	return 0;
	79	else
	80	return EAI_MEMORY;
	81	}
	82
	83	if (!hostname) {
	84	if (NULL != (*res = malloc_ai(port, htonl(0x7f000001))))
	85	return 0;
	86	else
	87	return EAI_MEMORY;
	88	}
	89
dc2a6d09	90	if (inet_aton(hostname, &in)) {
9c13d877	91	if (NULL != (*res = malloc_ai(port, in.s_addr)))
5daf7064	92	return 0;
	93	else
	94	return EAI_MEMORY;
	95	}
	96
	97	hp = gethostbyname(hostname);
	98	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
	99	for (i = 0; hp->h_addr_list[i]; i++) {
	100	cur = malloc_ai(port, ((struct in_addr *)hp->h_addr_list[i])->s_addr);
	101	if (cur == NULL) {
	102	if (*res)
	103	freeaddrinfo(*res);
	104	return EAI_MEMORY;
	105	}
	106
	107	if (prev)
	108	prev->ai_next = cur;
	109	else
	110	*res = cur;
	111
	112	prev = cur;
	113	}
	114	return 0;
	115	}
	116
	117	return EAI_NODATA;
48e671d5	118	}
48e671d5	119	#endif /* !HAVE_GETADDRINFO */