lu_utils.c   [plain text]

/*
 * Copyright (c) 1999-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.1 (the "License").  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

#include <stdlib.h>
#include <string.h>
#include <mach/mach.h>
#include <pthread.h>
#ifdef DEBUG
#include <syslog.h>
#endif
#include "_lu_types.h"
#include "lookup.h"
#include "lu_utils.h"

#define MAX_LOOKUP_ATTEMPTS 10

static pthread_key_t  _info_key             = NULL;
static pthread_once_t _info_key_initialized = PTHREAD_ONCE_INIT;

struct _lu_data_s
{
	unsigned int icount;
	unsigned int *ikey;
	void **idata;
	void (**idata_destructor)(void *);
};

#define _LU_MAXLUSTRLEN 256

ni_proplist *
_lookupd_xdr_dictionary(XDR *inxdr)
{
	int i, nkeys, j, nvals;
	char *key, *val;
	ni_proplist *l;

	if (!xdr_int(inxdr, &nkeys)) return NULL;

	l = (ni_proplist *)malloc(sizeof(ni_proplist));
	NI_INIT(l);

	l->ni_proplist_len = nkeys;
	l->ni_proplist_val = NULL;
	if (nkeys > 0)
	{
		i = nkeys * sizeof(ni_property);
		l->ni_proplist_val = (ni_property *)calloc(1, i);
	}

	for (i = 0; i < nkeys; i++)
	{
		key = NULL;
		if (!xdr_string(inxdr, &key, -1))
		{
			ni_proplist_free(l);
			return NULL;
		}

		l->ni_proplist_val[i].nip_name = key;
	
		if (!xdr_int(inxdr, &nvals))
		{
			ni_proplist_free(l);
			return NULL;
		}
	
		l->ni_proplist_val[i].nip_val.ni_namelist_len = nvals;
		if (nvals > 0)
		{
			j = nvals * sizeof(ni_name);
			l->ni_proplist_val[i].nip_val.ni_namelist_val = (ni_name *)calloc(1, j);
		}
		
		for (j = 0; j < nvals; j++)
		{
			val = NULL;
			if (!xdr_string(inxdr, &val, -1))
			{
				ni_proplist_free(l);
				return NULL;
			}

			l->ni_proplist_val[i].nip_val.ni_namelist_val[j] = val;
		}
	}

	return l;
}

int
lookupd_query(ni_proplist *l, ni_proplist ***out)
{
	unsigned datalen;
	XDR outxdr;
	XDR inxdr;
	int proc;
	char *listbuf, *s;
	char databuf[_LU_MAXLUSTRLEN * BYTES_PER_XDR_UNIT];
	int n, i, j, na;
	kern_return_t status;
	ni_property *p;

	if (l == NULL) return 0;
	if (out == NULL) return 0;

	if (_lu_port == NULL) return 0;

	status = _lookup_link(_lu_port, "query", &proc);
	if (status != KERN_SUCCESS) return 0;

	xdrmem_create(&outxdr, databuf, sizeof(databuf), XDR_ENCODE);

	na = l->ni_proplist_len;

	/* Encode attribute count */
	if (!xdr_int(&outxdr, &na))
	{
		xdr_destroy(&outxdr);
		return 0;
	}

	for (i = 0; i < l->ni_proplist_len; i++)
	{
		p = &(l->ni_proplist_val[i]);
		s = NULL;
		if (!xdr_string(&outxdr, &s, _LU_MAXLUSTRLEN))
		{
			xdr_destroy(&outxdr);
			return 0;
		}
		p->nip_name = s;

		if (!xdr_int(&outxdr, &(p->nip_val.ni_namelist_len)))
		{
			xdr_destroy(&outxdr);
			return 0;
		}

		for (j = 0; j < p->nip_val.ni_namelist_len; j++)
		{
			s = NULL;
			if (!xdr_string(&outxdr, &s, _LU_MAXLUSTRLEN))
			{
				xdr_destroy(&outxdr);
				return 0;
			}
			p->nip_val.ni_namelist_val[j] = s;
		}
	}

	listbuf = NULL;
	datalen = 0;

	n = xdr_getpos(&outxdr) / BYTES_PER_XDR_UNIT;
	status = _lookup_all(_lu_port, proc, (unit *)databuf, n, &listbuf, &datalen);
	if (status != KERN_SUCCESS)
	{
		xdr_destroy(&outxdr);
		return 0;
	}

	xdr_destroy(&outxdr);

#ifdef NOTDEF
/* NOTDEF because OOL buffers are counted in bytes with untyped IPC */
	datalen *= BYTES_PER_XDR_UNIT;
#endif

	xdrmem_create(&inxdr, listbuf, datalen, XDR_DECODE);

	if (!xdr_int(&inxdr, &n))
	{
		xdr_destroy(&inxdr);
		return 0;
	}

	if (n == 0)
	{
		xdr_destroy(&inxdr);
		return 0;
	}

	*out = (ni_proplist **)malloc(n * sizeof(ni_proplist *));

	for (i = 0; i < n; i++)
	{
		(*out)[i] = _lookupd_xdr_dictionary(&inxdr);
	}

	xdr_destroy(&inxdr);

	vm_deallocate(mach_task_self(), (vm_address_t)listbuf, datalen);
	
	return n;
}

ni_proplist *
lookupd_make_query(char *cat, char *fmt, ...)
{
	va_list ap;
	char *arg, *f;
	int na, x;
	ni_proplist *l;
	ni_property *p;

	if (fmt == NULL) return NULL;
	if (fmt[0] != 'k') return NULL;

	l = (ni_proplist *)malloc(sizeof(ni_proplist));
	NI_INIT(l);

	na = 0;
	x = -1;

	if (cat != NULL)
	{
		l->ni_proplist_val = (ni_property *)malloc(sizeof(ni_property));
		p = &(l->ni_proplist_val[0]);
		arg = "_lookup_category";
		p->nip_name = strdup(arg);
		p->nip_val.ni_namelist_len = 1;
		p->nip_val.ni_namelist_val = (ni_name *)malloc(sizeof(ni_name));
		p->nip_val.ni_namelist_val[0] = strdup(cat);

		l->ni_proplist_len++;
		x++;
	}

	va_start(ap, fmt);
	for (f = fmt; *f != NULL; f++)
	{
		arg = va_arg(ap, char *);
		if (*f == 'k')
		{
			l->ni_proplist_val = (ni_property *)realloc(l->ni_proplist_val, (l->ni_proplist_len + 1) * sizeof(ni_property));

			p = &(l->ni_proplist_val[l->ni_proplist_len]);
			p->nip_name = strdup(arg);
			p->nip_val.ni_namelist_len = 0;
			p->nip_val.ni_namelist_val = NULL;

			l->ni_proplist_len++;
			x++;
		}
		else
		{
			p = &(l->ni_proplist_val[x]);
			if (p->nip_val.ni_namelist_len == 0)
			{
				p->nip_val.ni_namelist_val = (ni_name *)malloc(sizeof(ni_name));
			}
			else
			{
				p->nip_val.ni_namelist_val = (ni_name *)realloc(p->nip_val.ni_namelist_val, (p->nip_val.ni_namelist_len + 1) * sizeof(ni_name));
			}
			p->nip_val.ni_namelist_val[p->nip_val.ni_namelist_len] = strdup(arg);
			p->nip_val.ni_namelist_len++;
		}
	}
	va_end(ap);

	return l;
}

void
ni_property_merge(ni_property *a, ni_property *b)
{
	int i, j, addme;

	if (a == NULL) return;
	if (b == NULL) return;

	for (j = 0; j < b->nip_val.ni_namelist_len; j++)
	{
		addme = 1;
		for (i = 0; i < (a->nip_val.ni_namelist_len) && (addme == 1); i++)
		{
			if (!strcmp(a->nip_val.ni_namelist_val[i], b->nip_val.ni_namelist_val[j])) addme = 0;
		}

		if (addme == 1)
		{
			a->nip_val.ni_namelist_val = (ni_name *)realloc(a->nip_val.ni_namelist_val, (a->nip_val.ni_namelist_len + 1) * sizeof(ni_name));
			a->nip_val.ni_namelist_val[a->nip_val.ni_namelist_len] = strdup(b->nip_val.ni_namelist_val[j]);
			a->nip_val.ni_namelist_len++;
		}
	}
}

void
ni_proplist_merge(ni_proplist *a, ni_proplist *b)
{
	ni_index wa, wb;
	int addme;

	if (a == NULL) return;
	if (b == NULL) return;

	for (wb = 0; wb < b->ni_proplist_len; wb++)
	{
		addme = 1;
		for (wa = 0; (wa < a->ni_proplist_len) && (addme == 1) ; wa++)
		{
			if (!strcmp(a->ni_proplist_val[wa].nip_name, b->ni_proplist_val[wb].nip_name)) addme = 0;
		}
		if (addme == 1)
		{
			a->ni_proplist_val = (ni_property *)realloc(a->ni_proplist_val, (a->ni_proplist_len + 1) * sizeof(ni_property));
			a->ni_proplist_val[a->ni_proplist_len].nip_name = strdup(b->ni_proplist_val[wb].nip_name);
			a->ni_proplist_val[a->ni_proplist_len].nip_val.ni_namelist_len = 0;
			a->ni_proplist_val[a->ni_proplist_len].nip_val.ni_namelist_val = NULL;
			a->ni_proplist_len++;
		}
	}

	for (wb = 0; wb < b->ni_proplist_len; wb++)
	{
		for (wa = 0; wa < a->ni_proplist_len; wa++)
		{
			if (!strcmp(a->ni_proplist_val[wa].nip_name, b->ni_proplist_val[wb].nip_name))
			{
				ni_property_merge(&(a->ni_proplist_val[wa]), &(b->ni_proplist_val[wb]));
			}
		}
	}
}

static void
_lu_data_free(void *x)
{
	struct _lu_data_s *t;
	int i;

	if (x == NULL) return;

	t = (struct _lu_data_s *)x;

	for (i = 0; i < t->icount; i++)
	{		
		if ((t->idata[i] != NULL) && (t->idata_destructor[i] != NULL))
		{
			(*(t->idata_destructor[i]))(t->idata[i]);
		}

		t->idata[i] = NULL;
		t->idata_destructor[i] = NULL;
	}

	if (t->ikey != NULL) free(t->ikey);
	t->ikey = NULL;

	if (t->idata != NULL) free(t->idata);
	t->idata = NULL;

	if (t->idata_destructor != NULL) free(t->idata_destructor);
	t->idata_destructor = NULL;

	free(t);
}

static void
_lu_data_init()
{
	pthread_key_create(&_info_key, _lu_data_free);
	return;
}

static struct _lu_data_s *
_lu_data_get()
{
	struct _lu_data_s *libinfo_data;

	/*
	 * Only one thread should create the _info_key
	 */
	pthread_once(&_info_key_initialized, _lu_data_init);

	/* Check if this thread already created libinfo_data */
	libinfo_data = pthread_getspecific(_info_key);
	if (libinfo_data != NULL) return libinfo_data;

	libinfo_data = (struct _lu_data_s *)calloc(1, sizeof(struct _lu_data_s));

	pthread_setspecific(_info_key, libinfo_data);
	return libinfo_data;
}

void *
_lu_data_create_key(unsigned int key, void (*destructor)(void *))
{
	struct _lu_data_s *libinfo_data;
	unsigned int i, n;

	libinfo_data = _lu_data_get();

	for (i = 0; i < libinfo_data->icount; i++)
	{
		if (libinfo_data->ikey[i] == key) return libinfo_data->idata[i];
	}

	i = libinfo_data->icount;
	n = i + 1;

	if (i == 0)
	{
		libinfo_data->ikey = (unsigned int *)malloc(sizeof(unsigned int));
		libinfo_data->idata = (void **)malloc(sizeof(void *));
		libinfo_data->idata_destructor = (void (**)(void *))malloc(sizeof(void (*)(void *)));
	}
	else
	{
		libinfo_data->ikey = (unsigned int *)realloc(libinfo_data->ikey, n * sizeof(unsigned int));
		libinfo_data->idata = (void **)realloc(libinfo_data->idata, n * sizeof(void *));
		libinfo_data->idata_destructor = (void (**)(void *))realloc(libinfo_data->idata_destructor, n * sizeof(void (*)(void *)));
	}

	libinfo_data->ikey[i] = key;
	libinfo_data->idata[i] = NULL;
	libinfo_data->idata_destructor[i] = destructor;
	libinfo_data->icount++;

	return NULL;
}

static unsigned int
_lu_data_index(unsigned int key, struct _lu_data_s *libinfo_data)
{
	unsigned int i;

	if (libinfo_data == NULL) return (unsigned int)-1;

	for (i = 0; i < libinfo_data->icount; i++)
	{
		if (libinfo_data->ikey[i] == key) return i;
	}

	return (unsigned int)-1;
}

void
_lu_data_set_key(unsigned int key, void *data)
{
	struct _lu_data_s *libinfo_data;
	unsigned int i;

	libinfo_data = _lu_data_get();

	i = _lu_data_index(key, libinfo_data);
	if (i == (unsigned int)-1) return;

	libinfo_data->idata[i] = data;
}

void *
_lu_data_get_key(unsigned int key)
{
	struct _lu_data_s *libinfo_data;
	unsigned int i;

	libinfo_data = _lu_data_get();

	i = _lu_data_index(key, libinfo_data);
	if (i == (unsigned int)-1) return NULL;

	return libinfo_data->idata[i];
}

void
_lu_data_free_vm_xdr(struct lu_thread_info *tdata)
{
	if (tdata == NULL) return;

	if (tdata->lu_vm != NULL)
	{
		vm_deallocate(mach_task_self(), (vm_address_t)tdata->lu_vm, tdata->lu_vm_length);
		tdata->lu_vm = NULL;
	}
	tdata->lu_vm_length = 0;
	tdata->lu_vm_cursor = 0;

	if (tdata->lu_xdr != NULL)
	{
		xdr_destroy(tdata->lu_xdr);
		free(tdata->lu_xdr);
		tdata->lu_xdr = NULL;
	}
}

int
_lu_xdr_attribute(XDR *xdr, char **key, char ***val, unsigned int *count)
{
	unsigned int i, j, len;
	char **x, *s;

	if (xdr == NULL) return -1;
	if (key == NULL) return -1;
	if (val == NULL) return -1;
	if (count == NULL) return -1;

	*key = NULL;
	*val = NULL;
	*count = 0;

	if (!xdr_string(xdr, key, -1)) return -1;

	if (!xdr_int(xdr, &len))
	{
		free(*key);
		*key = NULL;
		return -1;
	}

	if (len == 0) return 0;
	*count = len;

	x = (char **)calloc(len + 1, sizeof(char *));
	*val = x;

	for (i = 0; i < len; i++)
	{
		s = NULL;
		if (!xdr_string(xdr, &s, -1))
		{
			for (j = 0; j < i; j++) free(x[j]);
			free(x);
			*val = NULL;
			free(*key);
			*key = NULL;
			*count = 0;
			return -1;
		}
		x[i] = s;
	}

	x[len] = NULL;

	return 0;
}

kern_return_t 
_lookup_link(mach_port_t server, lookup_name name, int *procno)
{
	kern_return_t status;
	security_token_t token;
	unsigned int n;

	token.val[0] = -1;
	token.val[1] = -1;

	status = MIG_SERVER_DIED;
	for (n = 0; (status == MIG_SERVER_DIED) && (n < MAX_LOOKUP_ATTEMPTS); n++)
	{
		status = _lookup_link_secure(server, name, procno, &token);
	}

	if (status != KERN_SUCCESS)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_link %s status %u", getpid(), name, status);
#endif
		return status;
	}

	if (token.val[0] != 0)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_link %s auth failure uid=%d", getpid(), name, token.val[0]);
#endif
		return KERN_FAILURE;
	}

#ifdef DEBUG
	syslog(LOG_DEBUG, "pid %u _lookup_link %s = %d", getpid(), name, *procno);
#endif
	return status;
}

kern_return_t 
_lookup_one(mach_port_t server, int proc, inline_data indata, mach_msg_type_number_t indataCnt, inline_data outdata, mach_msg_type_number_t *outdataCnt)
{
	kern_return_t status;
	security_token_t token;
	unsigned int n;

	token.val[0] = -1;
	token.val[1] = -1;

	status = MIG_SERVER_DIED;
	for (n = 0; (status == MIG_SERVER_DIED) && (n < MAX_LOOKUP_ATTEMPTS); n++)
	{
		status = _lookup_one_secure(server, proc, indata, indataCnt, outdata, outdataCnt, &token);
	}

	if (status != KERN_SUCCESS)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_one %d status %u", getpid(), proc, status);
#endif
		return status;
	}

	if (token.val[0] != 0)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_one %d auth failure uid=%d", getpid(), proc, token.val[0]);
#endif
		return KERN_FAILURE;
	}

#ifdef DEBUG
	syslog(LOG_DEBUG, "pid %u _lookup_one %d", getpid(), proc);
#endif
	return status;
}

kern_return_t 
_lookup_all(mach_port_t server, int proc, inline_data indata, mach_msg_type_number_t indataCnt, ooline_data *outdata, mach_msg_type_number_t *outdataCnt)
{
	kern_return_t status;
	security_token_t token;
	unsigned int n;

	token.val[0] = -1;
	token.val[1] = -1;

	status = MIG_SERVER_DIED;
	for (n = 0; (status == MIG_SERVER_DIED) && (n < MAX_LOOKUP_ATTEMPTS); n++)
	{
		status = _lookup_all_secure(server, proc, indata, indataCnt, outdata, outdataCnt, &token);
	}

	if (status != KERN_SUCCESS)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_all %d status %u", getpid(), proc, status);
#endif
		return status;
	}

	if (token.val[0] != 0)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_all %d auth failure uid=%d", getpid(), proc, token.val[0]);
#endif
		return KERN_FAILURE;
	}

#ifdef DEBUG
	syslog(LOG_DEBUG, "pid %u _lookup_all %d", getpid(), proc);
#endif
	return status;
}

kern_return_t 
_lookup_ooall(mach_port_t server, int proc, ooline_data indata, mach_msg_type_number_t indataCnt, ooline_data *outdata, mach_msg_type_number_t *outdataCnt)
{
	kern_return_t status;
	security_token_t token;
	unsigned int n;

	token.val[0] = -1;
	token.val[1] = -1;

	status = MIG_SERVER_DIED;
	for (n = 0; (status == MIG_SERVER_DIED) && (n < MAX_LOOKUP_ATTEMPTS); n++)
	{
		status = _lookup_ooall_secure(server, proc, indata, indataCnt, outdata, outdataCnt, &token);
	}

	if (status != KERN_SUCCESS)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_ooall %d status %u", getpid(), proc, status);
#endif
		return status;
	}

	if (token.val[0] != 0)
	{
#ifdef DEBUG
		syslog(LOG_DEBUG, "pid %u _lookup_ooall %d auth failure uid=%d", getpid(), proc, token.val[0]);
#endif
		return KERN_FAILURE;
	}

#ifdef DEBUG
	syslog(LOG_DEBUG, "pid %u _lookup_ooall %d", getpid(), proc);
#endif
	return status;
}