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/* vim:ts=8:sts=8:sw=4:noai:noexpandtab
*
* global session ID helper functions.
*
* Copyright (c) 2006-2010 Miru Limited.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <errno.h>
#include <stdio.h>
#ifndef _WIN32
# include <netdb.h>
#endif
#include <impl/i18n.h>
#include <impl/framework.h>
//#define GSI_DEBUG
/* create a GSI based on md5 of a user provided data block.
*
* returns TRUE on success, returns FALSE on error and sets error appropriately,
*/
bool
pgm_gsi_create_from_data (
pgm_gsi_t* restrict gsi,
const uint8_t* restrict data,
const size_t length
)
{
pgm_return_val_if_fail (NULL != gsi, FALSE);
pgm_return_val_if_fail (NULL != data, FALSE);
pgm_return_val_if_fail (length > 1, FALSE);
#ifdef CONFIG_HAVE_GLIB_CHECKSUM
GChecksum* checksum = g_checksum_new (G_CHECKSUM_MD5);
pgm_return_val_if_fail (NULL != checksum, FALSE);
g_checksum_update (checksum, data, length);
memcpy (gsi, g_checksum_get_string (checksum) + 10, 6);
g_checksum_free (checksum);
#else
struct pgm_md5_t ctx;
char resblock[16];
pgm_md5_init_ctx (&ctx);
pgm_md5_process_bytes (&ctx, data, length);
pgm_md5_finish_ctx (&ctx, resblock);
memcpy (gsi, resblock + 10, 6);
#endif
return TRUE;
}
bool
pgm_gsi_create_from_string (
pgm_gsi_t* restrict gsi,
const char* restrict str,
ssize_t length /* -1 for NULL terminated */
)
{
pgm_return_val_if_fail (NULL != gsi, FALSE);
pgm_return_val_if_fail (NULL != str, FALSE);
if (length < 0)
length = strlen (str);
return pgm_gsi_create_from_data (gsi, (const uint8_t*)str, length);
}
/* create a global session ID as recommended by the PGM draft specification using
* low order 48 bits of md5 of the hostname.
*
* returns TRUE on success, returns FALSE on error and sets error appropriately,
*/
bool
pgm_gsi_create_from_hostname (
pgm_gsi_t* restrict gsi,
pgm_error_t** restrict error
)
{
pgm_return_val_if_fail (NULL != gsi, FALSE);
char hostname[NI_MAXHOST];
int retval = gethostname (hostname, sizeof(hostname));
if (0 != retval) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_IF,
pgm_error_from_errno (errno),
_("Resolving hostname: %s"),
#ifndef _WIN32
strerror (errno)
#else
pgm_wsastrerror (WSAGetLastError())
#endif
);
return FALSE;
}
return pgm_gsi_create_from_string (gsi, hostname, -1);
}
/* create a global session ID based on the IP address.
*
* returns TRUE on succcess, returns FALSE on error and sets error.
*/
bool
pgm_gsi_create_from_addr (
pgm_gsi_t* restrict gsi,
pgm_error_t** restrict error
)
{
char hostname[NI_MAXHOST];
struct addrinfo hints, *res = NULL;
pgm_return_val_if_fail (NULL != gsi, FALSE);
int retval = gethostname (hostname, sizeof(hostname));
if (0 != retval) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_IF,
pgm_error_from_errno (errno),
_("Resolving hostname: %s"),
#ifndef _WIN32
strerror (errno)
#else
pgm_wsastrerror (WSAGetLastError())
#endif
);
return FALSE;
}
memset (&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_flags = AI_ADDRCONFIG;
retval = getaddrinfo (hostname, NULL, &hints, &res);
if (0 != retval) {
pgm_set_error (error,
PGM_ERROR_DOMAIN_IF,
pgm_error_from_eai_errno (retval, errno),
_("Resolving hostname address: %s"),
gai_strerror (retval));
return FALSE;
}
memcpy (gsi, &((struct sockaddr_in*)(res->ai_addr))->sin_addr, sizeof(struct in_addr));
freeaddrinfo (res);
const uint16_t random_val = pgm_random_int_range (0, UINT16_MAX);
memcpy ((uint8_t*)gsi + sizeof(struct in_addr), &random_val, sizeof(random_val));
return TRUE;
}
/* re-entrant form of pgm_gsi_print()
*
* returns number of bytes written to buffer on success, returns -1 on
* invalid parameters.
*/
int
pgm_gsi_print_r (
const pgm_gsi_t* restrict gsi,
char* restrict buf,
const size_t bufsize
)
{
const uint8_t* restrict src = (const uint8_t* restrict)gsi;
pgm_return_val_if_fail (NULL != gsi, -1);
pgm_return_val_if_fail (NULL != buf, -1);
pgm_return_val_if_fail (bufsize > 0, -1);
#ifdef _MSC_VER
return _snprintf_s (buf, bufsize, _TRUNCATE, "%i.%i.%i.%i.%i.%i",
src[0], src[1], src[2], src[3], src[4], src[5]);
#else
return snprintf (buf, bufsize, "%i.%i.%i.%i.%i.%i",
src[0], src[1], src[2], src[3], src[4], src[5]);
#endif
}
/* transform GSI to ASCII string form.
*
* on success, returns pointer to ASCII string. on error, returns NULL.
*/
char*
pgm_gsi_print (
const pgm_gsi_t* gsi
)
{
static char buf[PGM_GSISTRLEN];
pgm_return_val_if_fail (NULL != gsi, NULL);
pgm_gsi_print_r (gsi, buf, sizeof(buf));
return buf;
}
/* compare two global session identifier GSI values and return TRUE if they are equal
*/
bool
pgm_gsi_equal (
const void* restrict p1,
const void* restrict p2
)
{
const union {
pgm_gsi_t gsi;
uint16_t s[3];
} *u1 = p1, *u2 = p2;
/* pre-conditions */
pgm_assert (NULL != p1);
pgm_assert (NULL != p2);
return (u1->s[0] == u2->s[0] && u1->s[1] == u2->s[1] && u1->s[2] == u2->s[2]);
}
/* eof */
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