/*      $NetBSD: rquotad.c,v 1.33 2014/03/18 11:00:20 gson Exp $        */

/*
 * by Manuel Bouyer (bouyer@ensta.fr). Public domain.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: rquotad.c,v 1.33 2014/03/18 11:00:20 gson Exp $");
#endif

#include <sys/param.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <signal.h>

#include <stdio.h>
#include <fstab.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>

#include <rpc/rpc.h>
#include <rpcsvc/rquota.h>
#include <arpa/inet.h>

#include <quota.h>

static void rquota_service(struct svc_req *request, SVCXPRT *transp);
static void ext_rquota_service(struct svc_req *request, SVCXPRT *transp);
static void sendquota(struct svc_req *request, int vers, SVCXPRT *transp);
__dead static void cleanup(int);

static int from_inetd = 1;

static void 
cleanup(int dummy)
{

        (void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
        (void)rpcb_unset(RQUOTAPROG, EXT_RQUOTAVERS, NULL);
        exit(0);
}

int
main(int argc, char *argv[])
{
        SVCXPRT *transp;
        struct sockaddr_storage from;
        socklen_t fromlen;

        fromlen = sizeof(from);
        if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
                from_inetd = 0;

        if (!from_inetd) {
                (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
                (void) rpcb_unset(RQUOTAPROG, EXT_RQUOTAVERS, NULL);
        }

        openlog("rpc.rquotad", LOG_PID, LOG_DAEMON);

        /* create and register the service */
        if (from_inetd) {
                transp = svc_dg_create(0, 0, 0);
                if (transp == NULL) {
                        syslog(LOG_ERR, "couldn't create udp service.");
                        exit(1);
                }
                if (!svc_reg(transp, RQUOTAPROG, RQUOTAVERS, rquota_service,
                    NULL)) {
                        syslog(LOG_ERR,
                            "unable to register (RQUOTAPROG, RQUOTAVERS).");
                        exit(1);
                }
                if (!svc_reg(transp, RQUOTAPROG, EXT_RQUOTAVERS,
                    ext_rquota_service, NULL)) {
                        syslog(LOG_ERR,
                            "unable to register (RQUOTAPROG, EXT_RQUOTAVERS).");
                        exit(1);
                }
        } else {
                if (!svc_create(rquota_service, RQUOTAPROG, RQUOTAVERS, "udp")){
                        syslog(LOG_ERR,
                            "unable to create (RQUOTAPROG, RQUOTAVERS).");
                        exit(1);
                }
                if (!svc_create(ext_rquota_service, RQUOTAPROG,
                    EXT_RQUOTAVERS, "udp")){
                        syslog(LOG_ERR,
                            "unable to create (RQUOTAPROG, EXT_RQUOTAVERS).");
                        exit(1);
                }
        }

        if (!from_inetd) {
                daemon(0, 0);
                (void) signal(SIGINT, cleanup);
                (void) signal(SIGTERM, cleanup);
                (void) signal(SIGHUP, cleanup);
        }
        svc_run();
        syslog(LOG_ERR, "svc_run returned");
        exit(1);
}

static void
rquota_service(struct svc_req *request, SVCXPRT *transp)
{
        switch (request->rq_proc) {
        case NULLPROC:
                (void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
                break;

        case RQUOTAPROC_GETQUOTA:
        case RQUOTAPROC_GETACTIVEQUOTA:
                sendquota(request, RQUOTAVERS, transp);
                break;

        default:
                svcerr_noproc(transp);
                break;
        }
        if (from_inetd)
                exit(0);
}

static void
ext_rquota_service(struct svc_req *request, SVCXPRT *transp)
{
        switch (request->rq_proc) {
        case NULLPROC:
                (void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
                break;

        case RQUOTAPROC_GETQUOTA:
        case RQUOTAPROC_GETACTIVEQUOTA:
                sendquota(request, EXT_RQUOTAVERS, transp);
                break;

        default:
                svcerr_noproc(transp);
                break;
        }
        if (from_inetd)
                exit(0);
}

/*
 * Convert a limit to rquota representation (where 0 == unlimited).
 * Clamp the result into a uint32_t.
 */
static uint32_t
limit_to_rquota(uint64_t lim)
{
        if (lim == QUOTA_NOLIMIT || lim > 0xfffffffeUL)
                return 0;
        else
                return (lim + 1);
}

/*
 * Convert a time to rquota representation.
 */
static uint32_t
time_to_rquota(time_t when, time_t now)
{
        if (when == QUOTA_NOTIME) {
                return 0;
        } else {
                return when - now;
        }
}

/*
 * Convert to rquota representation.
 */
static void
quotavals_to_rquota(const struct quotaval *blocks,
                    const struct quotaval *files,
                    struct rquota *rq)
{
        struct timeval now;

        gettimeofday(&now, NULL);

        rq->rq_active = TRUE;
        rq->rq_bsize = DEV_BSIZE;

        rq->rq_bhardlimit = limit_to_rquota(blocks->qv_hardlimit);
        rq->rq_bsoftlimit = limit_to_rquota(blocks->qv_softlimit);
        rq->rq_curblocks = blocks->qv_usage;
        rq->rq_btimeleft = time_to_rquota(blocks->qv_expiretime, now.tv_sec);

        rq->rq_fhardlimit = limit_to_rquota(files->qv_hardlimit);
        rq->rq_fsoftlimit = limit_to_rquota(files->qv_softlimit);
        rq->rq_curfiles = files->qv_usage;
        rq->rq_ftimeleft = time_to_rquota(files->qv_expiretime, now.tv_sec);
}

/* read quota for the specified id, and send it */
static void
sendquota(struct svc_req *request, int vers, SVCXPRT *transp)
{
        struct getquota_args getq_args;
        struct ext_getquota_args ext_getq_args;
        struct getquota_rslt getq_rslt;
        struct quotahandle *qh;
        struct quotakey qk;
        struct quotaval blocks, files;
        int idtype;

        memset((char *)&getq_args, 0, sizeof(getq_args));
        memset((char *)&ext_getq_args, 0, sizeof(ext_getq_args));
        switch (vers) {
        case RQUOTAVERS:
                if (!svc_getargs(transp, xdr_getquota_args,
                    (caddr_t)&getq_args)) {
                        svcerr_decode(transp);
                        return;
                }
                ext_getq_args.gqa_pathp = getq_args.gqa_pathp;
                ext_getq_args.gqa_id = getq_args.gqa_uid;
                ext_getq_args.gqa_type = RQUOTA_USRQUOTA;
                break;
        case EXT_RQUOTAVERS:
                if (!svc_getargs(transp, xdr_ext_getquota_args,
                    (caddr_t)&ext_getq_args)) {
                        svcerr_decode(transp);
                        return;
                }
                break;
        }
        switch (ext_getq_args.gqa_type) {
        case RQUOTA_USRQUOTA:
                idtype = QUOTA_IDTYPE_USER;
                break;
        case RQUOTA_GRPQUOTA:
                idtype = QUOTA_IDTYPE_GROUP;
                break;
        default:
                getq_rslt.status = Q_NOQUOTA;
                goto out;
        }
        if (request->rq_cred.oa_flavor != AUTH_UNIX) {
                /* bad auth */
                getq_rslt.status = Q_EPERM;
                goto out;
        }

        /*
         * XXX validate the path...
         */

        qh = quota_open(ext_getq_args.gqa_pathp);
        if (qh == NULL) {
                /*
                 * There are only three possible responses: success,
                 * permission denied, and "no quota", so we return
                 * the last for essentially all errors.
                 */
                if (errno == EPERM || errno == EACCES) {
                        getq_rslt.status = Q_EPERM;
                        goto out;
                }
                getq_rslt.status = Q_NOQUOTA;
                goto out;
        }

        qk.qk_id = ext_getq_args.gqa_id;
        qk.qk_idtype = idtype;
        qk.qk_objtype = QUOTA_OBJTYPE_BLOCKS;
        if (quota_get(qh, &qk, &blocks) < 0) {
                /* failed, return noquota */
                quota_close(qh);
                getq_rslt.status = Q_NOQUOTA;
                goto out;
        }

        qk.qk_objtype = QUOTA_OBJTYPE_FILES;
        if (quota_get(qh, &qk, &files) < 0) {
                /* failed, return noquota */
                quota_close(qh);
                getq_rslt.status = Q_NOQUOTA;
                goto out;
        }

        quota_close(qh);

        quotavals_to_rquota(&blocks, &files,
                            &getq_rslt.getquota_rslt_u.gqr_rquota);
        getq_rslt.status = Q_OK;

out:
        if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, (char *)&getq_rslt))
                svcerr_systemerr(transp);
        if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
                syslog(LOG_ERR, "unable to free arguments");
                exit(1);
        }
}