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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-host-utils.c
*
* Copyright (C) 2001 Ximian, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Chris Toshok, Jeffrey Stedfast
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#include "e-host-utils.h"
#if !defined (HAVE_GETHOSTBYNAME_R) || !defined (HAVE_GETHOSTBYADDR_R)
G_LOCK_DEFINE_STATIC (gethost_mutex);
#endif
#define GETHOST_PROCESS(h, host, buf, buflen, herr) G_STMT_START { \
int num_aliases = 0, num_addrs = 0; \
int req_length; \
char *p; \
int i; \
\
/* check to make sure we have enough room in our buffer */ \
req_length = 0; \
if (h->h_aliases) { \
for (i = 0; h->h_aliases[i]; i++) \
req_length += strlen (h->h_aliases[i]) + 1; \
num_aliases = i; \
} \
\
if (h->h_addr_list) { \
for (i = 0; h->h_addr_list[i]; i++) \
req_length += h->h_length; \
num_addrs = i; \
} \
\
req_length += sizeof (char *) * (num_aliases + 1); \
req_length += sizeof (char *) * (num_addrs + 1); \
req_length += strlen (h->h_name) + 1; \
\
if (buflen < req_length) { \
*herr = ERANGE; \
G_UNLOCK (gethost_mutex); \
return ERANGE; \
} \
\
/* we store the alias/addr pointers in the buffer */ \
/* their addresses here. */ \
p = buf; \
if (num_aliases) { \
host->h_aliases = (char **) p; \
p += sizeof (char *) * (num_aliases + 1); \
} else \
host->h_aliases = NULL; \
\
if (num_addrs) { \
host->h_addr_list = (char **) p; \
p += sizeof (char *) * (num_addrs + 1); \
} else \
host->h_addr_list = NULL; \
\
/* copy the host name into the buffer */ \
host->h_name = p; \
strcpy (p, h->h_name); \
p += strlen (h->h_name) + 1; \
host->h_addrtype = h->h_addrtype; \
host->h_length = h->h_length; \
\
/* copy the aliases/addresses into the buffer */ \
/* and assign pointers into the hostent */ \
*p = 0; \
if (num_aliases) { \
for (i = 0; i < num_aliases; i++) { \
strcpy (p, h->h_aliases[i]); \
host->h_aliases[i] = p; \
p += strlen (h->h_aliases[i]); \
} \
host->h_aliases[num_aliases] = NULL; \
} \
\
if (num_addrs) { \
for (i = 0; i < num_addrs; i++) { \
memcpy (p, h->h_addr_list[i], h->h_length); \
host->h_addr_list[i] = p; \
p += h->h_length; \
} \
host->h_addr_list[num_addrs] = NULL; \
} \
} G_STMT_END
#ifdef ENABLE_IPv6
/* some helpful utils for IPv6 lookups */
#define IPv6_BUFLEN_MIN (sizeof (char *) * 3)
static int
ai_to_herr (int error)
{
switch (error) {
case EAI_NONAME:
case EAI_FAIL:
return HOST_NOT_FOUND;
break;
case EAI_SERVICE:
return NO_DATA;
break;
case EAI_ADDRFAMILY:
return NO_ADDRESS;
break;
case EAI_NODATA:
return NO_DATA;
break;
case EAI_MEMORY:
return ENOMEM;
break;
case EAI_AGAIN:
return TRY_AGAIN;
break;
case EAI_SYSTEM:
return errno;
break;
default:
return NO_RECOVERY;
break;
}
}
#endif /* ENABLE_IPv6 */
/**
* e_gethostbyname_r:
* @name: the host to resolve
* @host: a buffer pointing to a struct hostent to use for storage
* @buf: a buffer to use for hostname storage
* @buflen: the size of @buf
* @herr: a pointer to a variable to store an error code in
*
* Resolves the hostname @name, in a hopefully-reentrant fashion.
*
* Return value: 0 on success, ERANGE if @buflen is too small,
* "something else" otherwise (in which case *@herr will be set to
* one of the gethostbyname() error codes).
**/
int
e_gethostbyname_r (const char *name, struct hostent *host,
char *buf, size_t buflen, int *herr)
{
#ifdef ENABLE_IPv6
struct addrinfo hints, *res;
int retval, len;
char *addr;
memset (&hints, 0, sizeof (struct addrinfo));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = 0;
hints.ai_protocol = 0;
if ((retval = getaddrinfo (name, NULL, &hints, &res)) != 0) {
*herr = ai_to_herr (retval);
return -1;
}
len = strlen (res->ai_canonname);
if (buflen < IPv6_BUFLEN_MIN + len + 1 + res->ai_addrlen)
return ERANGE;
/* h_name */
strcpy (buf, res->ai_canonname);
host->h_name = buf;
buf += len;
/* h_aliases */
((char **) buf)[0] = NULL;
host->h_aliases = (char **) buf;
buf += sizeof (char *);
/* h_addrtype and h_length */
host->h_length = res->ai_addrlen;
if (res->ai_family == PF_INET6) {
host->h_addrtype = AF_INET6;
addr = (char *) &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
} else {
host->h_addrtype = AF_INET;
addr = (char *) &((struct sockaddr_in *) res->ai_addr)->sin_addr;
}
memcpy (buf, addr, host->h_length);
addr = buf;
buf += host->h_length;
/* h_addr_list */
((char **) buf)[0] = addr;
((char **) buf)[1] = NULL;
host->h_addr_list = (char **) buf;
freeaddrinfo (res);
return 0;
#else /* No support for IPv6 addresses */
#ifdef HAVE_GETHOSTBYNAME_R
#ifdef GETHOSTBYNAME_R_FIVE_ARGS
if (gethostbyname_r (name, host, buf, buflen, herr))
return 0;
else
return errno;
#else
struct hostent *hp;
int retval;
retval = gethostbyname_r (name, host, buf, buflen, &hp, herr);
if (hp != NULL)
*herr = 0;
return retval;
#endif
#else /* No support for gethostbyname_r */
struct hostent *h;
G_LOCK (gethost_mutex);
h = gethostbyname (name);
if (!h) {
*herr = h_errno;
G_UNLOCK (gethost_mutex);
return -1;
}
GETHOST_PROCESS (h, host, buf, buflen, herr);
G_UNLOCK (gethost_mutex);
return 0;
#endif /* HAVE_GETHOSTBYNAME_R */
#endif /* ENABLE_IPv6 */
}
/**
* e_gethostbyaddr_r:
* @addr: the addr to resolve
* @len: address length
* @type: AF type
* @host: a buffer pointing to a struct hostent to use for storage
* @buf: a buffer to use for hostname storage
* @buflen: the size of @buf
* @herr: a pointer to a variable to store an error code in
*
* Resolves the address @addr, in a hopefully-reentrant fashion.
*
* Return value: 0 on success, ERANGE if @buflen is too small,
* "something else" otherwise (in which case *@herr will be set to
* one of the gethostbyaddr() error codes).
**/
int
e_gethostbyaddr_r (const char *addr, int len, int type, struct hostent *host,
char *buf, size_t buflen, int *herr)
{
#ifdef ENABLE_IPv6
struct addrinfo hints, *res;
const char *name;
int retval, len;
if ((name = inet_ntop (type, addr, buf, buflen)) == NULL) {
if (errno == ENOSPC)
return ERANGE;
return -1;
}
memset (&hints, 0, sizeof (struct addrinfo));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = type == AF_INET6 ? PF_INET6 : PF_INET;
hints.ai_socktype = 0;
hints.ai_protocol = 0;
if ((retval = getaddrinfo (name, NULL, &hints, &res)) != 0) {
*herr = ai_to_herr (retval);
return -1;
}
len = strlen (res->ai_canonname);
if (buflen < IPv6_BUFLEN_MIN + len + 1 + res->ai_addrlen)
return ERANGE;
/* h_name */
strcpy (buf, res->ai_canonname);
host->h_name = buf;
buf += len;
/* h_aliases */
((char **) buf)[0] = NULL;
host->h_aliases = (char **) buf;
buf += sizeof (char *);
/* h_addrtype and h_length */
host->h_length = res->ai_addrlen;
if (res->ai_family == PF_INET6) {
host->h_addrtype = AF_INET6;
addr = (char *) &((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
} else {
host->h_addrtype = AF_INET;
addr = (char *) &((struct sockaddr_in *) res->ai_addr)->sin_addr;
}
memcpy (buf, addr, host->h_length);
addr = buf;
buf += host->h_length;
/* h_addr_list */
((char **) buf)[0] = addr;
((char **) buf)[1] = NULL;
host->h_addr_list = (char **) buf;
freeaddrinfo (res);
return 0;
#else /* No support for IPv6 addresses */
#ifdef HAVE_GETHOSTBYADDR_R
#ifdef GETHOSTBYADDR_R_SEVEN_ARGS
if (gethostbyaddr_r (addr, len, type, host, buf, buflen, herr))
return 0;
else
return errno;
#else
struct hostent *hp;
int retval;
retval = gethostbyaddr_r (addr, len, type, host, buf, buflen, &hp, herr);
if (hp != NULL)
*herr = 0;
return retval;
#endif
#else /* No support for gethostbyaddr_r */
struct hostent *h;
G_LOCK (gethost_mutex);
h = gethostbyaddr (addr, len, type);
if (!h) {
*herr = h_errno;
G_UNLOCK (gethost_mutex);
return -1;
}
GETHOST_PROCESS (h, host, buf, buflen, herr);
G_UNLOCK (gethost_mutex);
return 0;
#endif /* HAVE_GETHOSTBYADDR_R */
#endif /* ENABLE_IPv6 */
}
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