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      1 /*	$NetBSD: rquotad.c,v 1.33 2014/03/18 11:00:20 gson Exp $	*/
      2 
      3 /*
      4  * by Manuel Bouyer (bouyer (at) ensta.fr). Public domain.
      5  */
      6 
      7 #include <sys/cdefs.h>
      8 #ifndef lint
      9 __RCSID("$NetBSD: rquotad.c,v 1.33 2014/03/18 11:00:20 gson Exp $");
     10 #endif
     11 
     12 #include <sys/param.h>
     13 #include <sys/types.h>
     14 #include <sys/mount.h>
     15 #include <sys/file.h>
     16 #include <sys/stat.h>
     17 #include <sys/socket.h>
     18 #include <signal.h>
     19 
     20 #include <stdio.h>
     21 #include <fstab.h>
     22 #include <ctype.h>
     23 #include <stdlib.h>
     24 #include <string.h>
     25 #include <pwd.h>
     26 #include <grp.h>
     27 #include <errno.h>
     28 #include <unistd.h>
     29 #include <syslog.h>
     30 
     31 #include <rpc/rpc.h>
     32 #include <rpcsvc/rquota.h>
     33 #include <arpa/inet.h>
     34 
     35 #include <quota.h>
     36 
     37 static void rquota_service(struct svc_req *request, SVCXPRT *transp);
     38 static void ext_rquota_service(struct svc_req *request, SVCXPRT *transp);
     39 static void sendquota(struct svc_req *request, int vers, SVCXPRT *transp);
     40 __dead static void cleanup(int);
     41 
     42 static int from_inetd = 1;
     43 
     44 static void
     45 cleanup(int dummy)
     46 {
     47 
     48 	(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
     49 	(void)rpcb_unset(RQUOTAPROG, EXT_RQUOTAVERS, NULL);
     50 	exit(0);
     51 }
     52 
     53 int
     54 main(int argc, char *argv[])
     55 {
     56 	SVCXPRT *transp;
     57 	struct sockaddr_storage from;
     58 	socklen_t fromlen;
     59 
     60 	fromlen = sizeof(from);
     61 	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
     62 		from_inetd = 0;
     63 
     64 	if (!from_inetd) {
     65 		(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
     66 		(void) rpcb_unset(RQUOTAPROG, EXT_RQUOTAVERS, NULL);
     67 	}
     68 
     69 	openlog("rpc.rquotad", LOG_PID, LOG_DAEMON);
     70 
     71 	/* create and register the service */
     72 	if (from_inetd) {
     73 		transp = svc_dg_create(0, 0, 0);
     74 		if (transp == NULL) {
     75 			syslog(LOG_ERR, "couldn't create udp service.");
     76 			exit(1);
     77 		}
     78 		if (!svc_reg(transp, RQUOTAPROG, RQUOTAVERS, rquota_service,
     79 		    NULL)) {
     80 			syslog(LOG_ERR,
     81 			    "unable to register (RQUOTAPROG, RQUOTAVERS).");
     82 			exit(1);
     83 		}
     84 		if (!svc_reg(transp, RQUOTAPROG, EXT_RQUOTAVERS,
     85 		    ext_rquota_service, NULL)) {
     86 			syslog(LOG_ERR,
     87 			    "unable to register (RQUOTAPROG, EXT_RQUOTAVERS).");
     88 			exit(1);
     89 		}
     90 	} else {
     91 		if (!svc_create(rquota_service, RQUOTAPROG, RQUOTAVERS, "udp")){
     92 			syslog(LOG_ERR,
     93 			    "unable to create (RQUOTAPROG, RQUOTAVERS).");
     94 			exit(1);
     95 		}
     96 		if (!svc_create(ext_rquota_service, RQUOTAPROG,
     97 		    EXT_RQUOTAVERS, "udp")){
     98 			syslog(LOG_ERR,
     99 			    "unable to create (RQUOTAPROG, EXT_RQUOTAVERS).");
    100 			exit(1);
    101 		}
    102 	}
    103 
    104 	if (!from_inetd) {
    105 		daemon(0, 0);
    106 		(void) signal(SIGINT, cleanup);
    107 		(void) signal(SIGTERM, cleanup);
    108 		(void) signal(SIGHUP, cleanup);
    109 	}
    110 	svc_run();
    111 	syslog(LOG_ERR, "svc_run returned");
    112 	exit(1);
    113 }
    114 
    115 static void
    116 rquota_service(struct svc_req *request, SVCXPRT *transp)
    117 {
    118 	switch (request->rq_proc) {
    119 	case NULLPROC:
    120 		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
    121 		break;
    122 
    123 	case RQUOTAPROC_GETQUOTA:
    124 	case RQUOTAPROC_GETACTIVEQUOTA:
    125 		sendquota(request, RQUOTAVERS, transp);
    126 		break;
    127 
    128 	default:
    129 		svcerr_noproc(transp);
    130 		break;
    131 	}
    132 	if (from_inetd)
    133 		exit(0);
    134 }
    135 
    136 static void
    137 ext_rquota_service(struct svc_req *request, SVCXPRT *transp)
    138 {
    139 	switch (request->rq_proc) {
    140 	case NULLPROC:
    141 		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
    142 		break;
    143 
    144 	case RQUOTAPROC_GETQUOTA:
    145 	case RQUOTAPROC_GETACTIVEQUOTA:
    146 		sendquota(request, EXT_RQUOTAVERS, transp);
    147 		break;
    148 
    149 	default:
    150 		svcerr_noproc(transp);
    151 		break;
    152 	}
    153 	if (from_inetd)
    154 		exit(0);
    155 }
    156 
    157 /*
    158  * Convert a limit to rquota representation (where 0 == unlimited).
    159  * Clamp the result into a uint32_t.
    160  */
    161 static uint32_t
    162 limit_to_rquota(uint64_t lim)
    163 {
    164 	if (lim == QUOTA_NOLIMIT || lim > 0xfffffffeUL)
    165 		return 0;
    166 	else
    167 		return (lim + 1);
    168 }
    169 
    170 /*
    171  * Convert a time to rquota representation.
    172  */
    173 static uint32_t
    174 time_to_rquota(time_t when, time_t now)
    175 {
    176 	if (when == QUOTA_NOTIME) {
    177 		return 0;
    178 	} else {
    179 		return when - now;
    180 	}
    181 }
    182 
    183 /*
    184  * Convert to rquota representation.
    185  */
    186 static void
    187 quotavals_to_rquota(const struct quotaval *blocks,
    188 		    const struct quotaval *files,
    189 		    struct rquota *rq)
    190 {
    191 	struct timeval now;
    192 
    193 	gettimeofday(&now, NULL);
    194 
    195 	rq->rq_active = TRUE;
    196 	rq->rq_bsize = DEV_BSIZE;
    197 
    198 	rq->rq_bhardlimit = limit_to_rquota(blocks->qv_hardlimit);
    199 	rq->rq_bsoftlimit = limit_to_rquota(blocks->qv_softlimit);
    200 	rq->rq_curblocks = blocks->qv_usage;
    201 	rq->rq_btimeleft = time_to_rquota(blocks->qv_expiretime, now.tv_sec);
    202 
    203 	rq->rq_fhardlimit = limit_to_rquota(files->qv_hardlimit);
    204 	rq->rq_fsoftlimit = limit_to_rquota(files->qv_softlimit);
    205 	rq->rq_curfiles = files->qv_usage;
    206 	rq->rq_ftimeleft = time_to_rquota(files->qv_expiretime, now.tv_sec);
    207 }
    208 
    209 /* read quota for the specified id, and send it */
    210 static void
    211 sendquota(struct svc_req *request, int vers, SVCXPRT *transp)
    212 {
    213 	struct getquota_args getq_args;
    214 	struct ext_getquota_args ext_getq_args;
    215 	struct getquota_rslt getq_rslt;
    216 	struct quotahandle *qh;
    217 	struct quotakey qk;
    218 	struct quotaval blocks, files;
    219 	int idtype;
    220 
    221 	memset((char *)&getq_args, 0, sizeof(getq_args));
    222 	memset((char *)&ext_getq_args, 0, sizeof(ext_getq_args));
    223 	switch (vers) {
    224 	case RQUOTAVERS:
    225 		if (!svc_getargs(transp, xdr_getquota_args,
    226 		    (caddr_t)&getq_args)) {
    227 			svcerr_decode(transp);
    228 			return;
    229 		}
    230 		ext_getq_args.gqa_pathp = getq_args.gqa_pathp;
    231 		ext_getq_args.gqa_id = getq_args.gqa_uid;
    232 		ext_getq_args.gqa_type = RQUOTA_USRQUOTA;
    233 		break;
    234 	case EXT_RQUOTAVERS:
    235 		if (!svc_getargs(transp, xdr_ext_getquota_args,
    236 		    (caddr_t)&ext_getq_args)) {
    237 			svcerr_decode(transp);
    238 			return;
    239 		}
    240 		break;
    241 	}
    242 	switch (ext_getq_args.gqa_type) {
    243 	case RQUOTA_USRQUOTA:
    244 		idtype = QUOTA_IDTYPE_USER;
    245 		break;
    246 	case RQUOTA_GRPQUOTA:
    247 		idtype = QUOTA_IDTYPE_GROUP;
    248 		break;
    249 	default:
    250 		getq_rslt.status = Q_NOQUOTA;
    251 		goto out;
    252 	}
    253 	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
    254 		/* bad auth */
    255 		getq_rslt.status = Q_EPERM;
    256 		goto out;
    257 	}
    258 
    259 	/*
    260 	 * XXX validate the path...
    261 	 */
    262 
    263 	qh = quota_open(ext_getq_args.gqa_pathp);
    264 	if (qh == NULL) {
    265 		/*
    266 		 * There are only three possible responses: success,
    267 		 * permission denied, and "no quota", so we return
    268 		 * the last for essentially all errors.
    269 		 */
    270 		if (errno == EPERM || errno == EACCES) {
    271 			getq_rslt.status = Q_EPERM;
    272 			goto out;
    273 		}
    274 		getq_rslt.status = Q_NOQUOTA;
    275 		goto out;
    276 	}
    277 
    278 	qk.qk_id = ext_getq_args.gqa_id;
    279 	qk.qk_idtype = idtype;
    280 	qk.qk_objtype = QUOTA_OBJTYPE_BLOCKS;
    281 	if (quota_get(qh, &qk, &blocks) < 0) {
    282 		/* failed, return noquota */
    283 		quota_close(qh);
    284 		getq_rslt.status = Q_NOQUOTA;
    285 		goto out;
    286 	}
    287 
    288 	qk.qk_objtype = QUOTA_OBJTYPE_FILES;
    289 	if (quota_get(qh, &qk, &files) < 0) {
    290 		/* failed, return noquota */
    291 		quota_close(qh);
    292 		getq_rslt.status = Q_NOQUOTA;
    293 		goto out;
    294 	}
    295 
    296 	quota_close(qh);
    297 
    298 	quotavals_to_rquota(&blocks, &files,
    299 			    &getq_rslt.getquota_rslt_u.gqr_rquota);
    300 	getq_rslt.status = Q_OK;
    301 
    302 out:
    303 	if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, (char *)&getq_rslt))
    304 		svcerr_systemerr(transp);
    305 	if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
    306 		syslog(LOG_ERR, "unable to free arguments");
    307 		exit(1);
    308 	}
    309 }
    310