Modules/nismodule.c

/***********************************************************
    Written by:
	Fred Gansevles <Fred.Gansevles@cs.utwente.nl>
	Vakgroep Spa,
	Faculteit der Informatica,
	Universiteit Twente,
	Enschede,
	the Netherlands.
******************************************************************/

/* NIS module implementation */

#include "allobjects.h"
#include "modsupport.h"
#include "ceval.h"

#include <sys/time.h>
#include <sys/types.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>

static object *NisError;

static object *
nis_error (err)
	int err;
{
	err_setstr(NisError, yperr_string(err));
	return NULL;
}

static struct nis_map {
	char *alias;
	char *map;
} aliases [] = {
	{"passwd",	"passwd.byname"},
	{"group",	"group.byname"},
	{"networks",	"networks.byaddr"},
	{"hosts",	"hosts.byname"},
	{"protocols",	"protocols.bynumber"},
	{"services",	"services.byname"},
	{"aliases",	"mail.aliases"},
	{"ethers",	"ethers.byname"},
	{0L,		0L}
};

static char *
nis_mapname (map)
	char *map;
{
	int i;

	for (i=0; aliases[i].alias != 0L; i++)
		if (!strcmp (aliases[i].alias, map))
			map = aliases[i].map;
	return map;
}

typedef int (*foreachfunc) PROTO((int, char *, int, char *, int, char *));

static int
nis_foreach (instatus, inkey, inkeylen, inval, invallen, indata)
	int instatus;
	char *inkey;
	int inkeylen;
	char *inval;
	int invallen;
	object *indata;
{
	if (instatus == YP_TRUE) {
		object *key = newsizedstringobject(inkey, inkeylen);
		object *val = newsizedstringobject(inval, invallen);
		int err;
		if (key == NULL || val == NULL) {
			/* XXX error -- don't know how to handle */
			err_clear();
			XDECREF(key);
			XDECREF(val);
			return 1;
		}
		err = mappinginsert(indata, key, val);
		DECREF(key);
		DECREF(val);
		if (err != 0) {
			err_clear();
			return 1;
		}
		return 0;
	}
	return 1;
}

static object *
nis_match (self, args)
	object *self;
	object *args;
{
	char *match;
	char *domain;
	int keylen, len;
	char *key, *map;
	int err;
	object *res;

	if (!getargs(args, "(s#s)", &key, &keylen, &map))
		return NULL;
	if ((err = yp_get_default_domain(&domain)) != 0)
		return nis_error(err);
	BGN_SAVE
	map = nis_mapname (map);
	err = yp_match (domain, map, key, keylen, &match, &len);
	END_SAVE
	if (err != 0)
		return nis_error(err);
	res = newsizedstringobject (match, len);
	free (match);
	return res;
}

static object *
nis_cat (self, args)
	object *self;
	object *args;
{
	char *domain;
	char *map;
	struct ypall_callback cb;
	object *cat;
	int err;

	if (!getstrarg(args, &map))
		return NULL;
	if ((err = yp_get_default_domain(&domain)) != 0)
		return nis_error(err);
	cat = newdictobject ();
	if (cat == NULL)
		return NULL;
	cb.foreach = (foreachfunc)nis_foreach;
	cb.data = (char *)cat;
	BGN_SAVE
	map = nis_mapname (map);
	err = yp_all (domain, map, &cb);
	END_SAVE
	if (err != 0) {
		DECREF(cat);
		return nis_error(err);
	}
	return cat;
}

/* These should be u_long on Sun h/w but not on 64-bit h/w.
   This is not portable to machines with 16-bit ints and no prototypes */
#ifndef YPPROC_MAPLIST
#define YPPROC_MAPLIST	11
#endif
#ifndef YPPROG
#define YPPROG		100004
#endif
#ifndef YPVERS
#define YPVERS		2
#endif

typedef char *domainname;
typedef char *mapname;

enum nisstat {
    NIS_TRUE = 1,
    NIS_NOMORE = 2,
    NIS_FALSE = 0,
    NIS_NOMAP = -1,
    NIS_NODOM = -2,
    NIS_NOKEY = -3,
    NIS_BADOP = -4,
    NIS_BADDB = -5,
    NIS_YPERR = -6,
    NIS_BADARGS = -7,
    NIS_VERS = -8
};
typedef enum nisstat nisstat;

struct nismaplist {
    mapname map;
    struct nismaplist *next;
};
typedef struct nismaplist nismaplist;

struct nisresp_maplist {
	nisstat stat;
	nismaplist *maps;
};
typedef struct nisresp_maplist nisresp_maplist;

static struct timeval TIMEOUT = { 25, 0 };

static
bool_t
nis_xdr_domainname(xdrs, objp)
    XDR *xdrs;
    domainname *objp;
{
    if (!xdr_string(xdrs, objp, YPMAXDOMAIN)) {
        return (FALSE);
    }
    return (TRUE);
}

static
bool_t
nis_xdr_mapname(xdrs, objp)
    XDR *xdrs;
    mapname *objp;
{
    if (!xdr_string(xdrs, objp, YPMAXMAP)) {
        return (FALSE);
    }
    return (TRUE);
}

static
bool_t
nis_xdr_ypmaplist(xdrs, objp)
    XDR *xdrs;
    nismaplist *objp;
{
    if (!nis_xdr_mapname(xdrs, &objp->map)) {
        return (FALSE);
    }
    if (!xdr_pointer(xdrs, (char **)&objp->next, sizeof(nismaplist), nis_xdr_ypmaplist)) {
        return (FALSE);
    }
    return (TRUE);
}

static
bool_t
nis_xdr_ypstat(xdrs, objp)
    XDR *xdrs;
    nisstat *objp;
{
    if (!xdr_enum(xdrs, (enum_t *)objp)) {
        return (FALSE);
    }
    return (TRUE);
}


static
bool_t
nis_xdr_ypresp_maplist(xdrs, objp)
    XDR *xdrs;
    nisresp_maplist *objp;
{
    if (!nis_xdr_ypstat(xdrs, &objp->stat)) {
        return (FALSE);
    }
    if (!xdr_pointer(xdrs, (char **)&objp->maps, sizeof(nismaplist), nis_xdr_ypmaplist)) {
        return (FALSE);
    }
    return (TRUE);
}


static
nisresp_maplist *
nisproc_maplist_2(argp, clnt)
    domainname *argp;
    CLIENT *clnt;
{
    static nisresp_maplist res;

    memset(&res, 0, sizeof(res));
    if (clnt_call(clnt, YPPROC_MAPLIST, nis_xdr_domainname, (caddr_t)argp,
		  nis_xdr_ypresp_maplist, (caddr_t)&res, TIMEOUT)
	!= RPC_SUCCESS) {
        return (NULL);
    }
    return (&res);
}

static
nismaplist *
nis_maplist ()
{
	nisresp_maplist *list;
	char *dom;
	CLIENT *cl, *clnt_create();
	char *server;

	yp_get_default_domain (&dom);
	yp_master (dom, aliases[0].map, &server);
	cl = clnt_create(server, YPPROG, YPVERS, "tcp");
	if (cl == NULL) {
		clnt_pcreateerror(server);
		return NULL;
	}
	list = nisproc_maplist_2 (&dom, cl);
	if (list == NULL)
		return NULL;
	if (list->stat != NIS_TRUE)
		return NULL;
	return list->maps;
}

static object *
nis_maps (self, args)
	object *self;
	object *args;
{
	nismaplist *maps;
	object *list;

	if ((maps = nis_maplist ()) == NULL)
		return NULL;
	if ((list = newlistobject(0)) == NULL)
		return NULL;
	for (maps = maps->next; maps; maps = maps->next) {
		if (addlistitem (list, newstringobject (maps->map)) < 0) {
			DECREF(list);
			list = NULL;
			break;
		}
	}
	/* XXX Shouldn't we free the list of maps now? */
	return list;
}

static struct methodlist nis_methods[] = {
	{"match",	nis_match},
	{"cat",		nis_cat},
	{"maps",	nis_maps},
	{NULL,		NULL}		 /* Sentinel */
};

void
initnis ()
{
	object *m, *d;
	m = initmodule("nis", nis_methods);
	d = getmoduledict(m);
	NisError = newstringobject("nis.error");
	if (NisError == NULL || dictinsert(d, "error", NisError) != 0)
		fatal("Cannot define nis.error");
}