1 /*
2  * by Manuel Bouyer (bouyer@ensta.fr)
3  *
4  * There is no copyright, you can use it as you want.
5  */
6 
7 #include <sys/cdefs.h>
8 __FBSDID("$FreeBSD: stable/12/libexec/rpc.rquotad/rquotad.c 336017 2018-07-05 22:56:13Z sef $");
9 
10 #include <sys/param.h>
11 #include <sys/mount.h>
12 #include <sys/file.h>
13 #include <sys/stat.h>
14 #include <sys/socket.h>
15 
16 #include <ufs/ufs/quota.h>
17 #include <rpc/rpc.h>
18 #include <rpcsvc/rquota.h>
19 #include <arpa/inet.h>
20 #include <netdb.h>
21 
22 #include <ctype.h>
23 #include <errno.h>
24 #include <fstab.h>
25 #include <grp.h>
26 #include <libutil.h>
27 #include <pwd.h>
28 #include <signal.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <err.h>
32 #include <string.h>
33 #include <syslog.h>
34 #include <unistd.h>
35 
36 static void rquota_service_1(struct svc_req *request, SVCXPRT *transp);
37 static void rquota_service_2(struct svc_req *request, SVCXPRT *transp);
38 static void sendquota(struct svc_req *request, SVCXPRT *transp);
39 static void sendquota_extended(struct svc_req *request, SVCXPRT *transp);
40 static int getfsquota(int type, long id, char *path, struct dqblk *dqblk);
41 
42 static int from_inetd = 1;
43 static int debug = 0;
44 
45 static void
cleanup(int sig)46 cleanup(int sig)
47 {
48 
49 	(void)sig;
50 	(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
51 	exit(0);
52 }
53 
54 int
main(int argc,char ** argv)55 main(int argc, char **argv)
56 {
57 	SVCXPRT *transp;
58 	int ok;
59 	struct sockaddr_storage from;
60 	socklen_t fromlen;
61 	int vers;
62 	int ch;
63 
64 	while ((ch = getopt(argc, argv, "d")) != -1) {
65 		switch (ch) {
66 		case 'd':
67 			debug++;
68 			break;
69 		default:
70 			break;
71 		}
72 	}
73 
74 	fromlen = sizeof(from);
75 	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
76 		from_inetd = 0;
77 
78 	if (!from_inetd) {
79 		if (!debug)
80 			daemon(0, 0);
81 		(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
82 		(void)signal(SIGINT, cleanup);
83 		(void)signal(SIGTERM, cleanup);
84 		(void)signal(SIGHUP, cleanup);
85 	}
86 
87 	openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
88 
89 	/* create and register the service */
90 	if (from_inetd) {
91 		transp = svc_tli_create(0, NULL, NULL, 0, 0);
92 		if (transp == NULL) {
93 			syslog(LOG_ERR, "couldn't create udp service.");
94 			exit(1);
95 		}
96 		vers = RQUOTAVERS;
97 		ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
98 		    rquota_service_1, NULL);
99 		if (ok) {
100 			vers = EXT_RQUOTAVERS;
101 			ok = svc_reg(transp, RQUOTAPROG, EXT_RQUOTAVERS,
102 				     rquota_service_2, NULL);
103 		}
104 	} else {
105 		vers = RQUOTAVERS;
106 		ok = svc_create(rquota_service_1,
107 		    RQUOTAPROG, RQUOTAVERS, "udp");
108 		if (ok) {
109 			vers = EXT_RQUOTAVERS;
110 			ok = svc_create(rquota_service_2,
111 					RQUOTAPROG, EXT_RQUOTAVERS, "udp");
112 
113 		}
114 	}
115 	if (!ok) {
116 		syslog(LOG_ERR,
117 		    "unable to register (RQUOTAPROG, %s, %s)",
118 		       vers == RQUOTAVERS ? "RQUOTAVERS" : "EXT_RQUOTAVERS",
119 		       from_inetd ? "(inetd)" : "udp");
120 		exit(1);
121 	}
122 
123 	svc_run();
124 	syslog(LOG_ERR, "svc_run returned");
125 	exit(1);
126 }
127 
128 static void
rquota_service_2(struct svc_req * request,SVCXPRT * transp)129 rquota_service_2(struct svc_req *request, SVCXPRT *transp)
130 {
131 
132 	switch (request->rq_proc) {
133 	case NULLPROC:
134 		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL);
135 		break;
136 	case RQUOTAPROC_GETQUOTA:
137 	case RQUOTAPROC_GETACTIVEQUOTA:
138 		sendquota_extended(request, transp);
139 		break;
140 	default:
141 		svcerr_noproc(transp);
142 		break;
143 	}
144 	if (from_inetd)
145 		exit(0);
146 }
147 
148 static void
rquota_service_1(struct svc_req * request,SVCXPRT * transp)149 rquota_service_1(struct svc_req *request, SVCXPRT *transp)
150 {
151 
152 	switch (request->rq_proc) {
153 	case NULLPROC:
154 		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL);
155 		break;
156 	case RQUOTAPROC_GETQUOTA:
157 	case RQUOTAPROC_GETACTIVEQUOTA:
158 		sendquota(request, transp);
159 		break;
160 	default:
161 		svcerr_noproc(transp);
162 		break;
163 	}
164 	if (from_inetd)
165 		exit(0);
166 }
167 
168 /* read quota for the specified id, and send it */
169 static void
sendquota(struct svc_req * request,SVCXPRT * transp)170 sendquota(struct svc_req *request, SVCXPRT *transp)
171 {
172 	struct getquota_args getq_args;
173 	struct getquota_rslt getq_rslt;
174 	struct dqblk dqblk;
175 	struct timeval timev;
176 	int scale;
177 
178 	bzero(&getq_args, sizeof(getq_args));
179 	if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
180 		svcerr_decode(transp);
181 		return;
182 	}
183 	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
184 		/* bad auth */
185 		getq_rslt.status = Q_EPERM;
186 	} else if (!getfsquota(USRQUOTA, getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
187 		/* failed, return noquota */
188 		getq_rslt.status = Q_NOQUOTA;
189 	} else {
190 		gettimeofday(&timev, NULL);
191 		getq_rslt.status = Q_OK;
192 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
193 		scale = 1 << flsll(dqblk.dqb_bhardlimit >> 32);
194 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize =
195 		    DEV_BSIZE * scale;
196 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
197 		    dqblk.dqb_bhardlimit / scale;
198 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
199 		    dqblk.dqb_bsoftlimit / scale;
200 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
201 		    dqblk.dqb_curblocks / scale;
202 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
203 		    dqblk.dqb_ihardlimit;
204 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
205 		    dqblk.dqb_isoftlimit;
206 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
207 		    dqblk.dqb_curinodes;
208 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
209 		    dqblk.dqb_btime - timev.tv_sec;
210 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
211 		    dqblk.dqb_itime - timev.tv_sec;
212 	}
213 	if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt))
214 		svcerr_systemerr(transp);
215 	if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
216 		syslog(LOG_ERR, "unable to free arguments");
217 		exit(1);
218 	}
219 }
220 
221 static void
sendquota_extended(struct svc_req * request,SVCXPRT * transp)222 sendquota_extended(struct svc_req *request, SVCXPRT *transp)
223 {
224 	struct ext_getquota_args getq_args;
225 	struct getquota_rslt getq_rslt;
226 	struct dqblk dqblk;
227 	struct timeval timev;
228 	int scale;
229 
230 	bzero(&getq_args, sizeof(getq_args));
231 	if (!svc_getargs(transp, (xdrproc_t)xdr_ext_getquota_args, &getq_args)) {
232 		svcerr_decode(transp);
233 		return;
234 	}
235 	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
236 		/* bad auth */
237 		getq_rslt.status = Q_EPERM;
238 	} else if (!getfsquota(getq_args.gqa_type, getq_args.gqa_id, getq_args.gqa_pathp, &dqblk)) {
239 		/* failed, return noquota */
240 		getq_rslt.status = Q_NOQUOTA;
241 	} else {
242 		gettimeofday(&timev, NULL);
243 		getq_rslt.status = Q_OK;
244 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
245 		scale = 1 << flsll(dqblk.dqb_bhardlimit >> 32);
246 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize =
247 		    DEV_BSIZE * scale;
248 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
249 		    dqblk.dqb_bhardlimit / scale;
250 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
251 		    dqblk.dqb_bsoftlimit / scale;
252 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
253 		    dqblk.dqb_curblocks / scale;
254 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
255 		    dqblk.dqb_ihardlimit;
256 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
257 		    dqblk.dqb_isoftlimit;
258 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
259 		    dqblk.dqb_curinodes;
260 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
261 		    dqblk.dqb_btime - timev.tv_sec;
262 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
263 		    dqblk.dqb_itime - timev.tv_sec;
264 	}
265 	if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt))
266 		svcerr_systemerr(transp);
267 	if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
268 		syslog(LOG_ERR, "unable to free arguments");
269 		exit(1);
270 	}
271 }
272 
273 /*
274  * gets the quotas for id, filesystem path.
275  * Return 0 if fail, 1 otherwise
276  */
277 static int
getfsquota(int type,long id,char * path,struct dqblk * dqblk)278 getfsquota(int type, long id, char *path, struct dqblk *dqblk)
279 {
280 	struct quotafile *qf;
281 	/*
282 	 * Remote quota checking is limited to mounted filesystems.
283 	 * Since UFS and ZFS support the quota system calls, we
284 	 * only need to make an fstab object that has the path, and
285 	 * a blank name for the filesystem type.
286 	 * This allows the quota_open() call to work the way we
287 	 * expect it to.
288 	 *
289 	 * The static char declaration is because compiler warnings
290 	 * don't allow passing a const char * to a char *.
291 	 */
292 	int rv;
293 	static char blank[] = "";
294 	struct fstab fst;
295 
296 	fst.fs_file = path;
297 	fst.fs_mntops = blank;
298 	fst.fs_vfstype = blank;
299 
300 	if (type != USRQUOTA && type != GRPQUOTA)
301 		return (0);
302 
303 	qf = quota_open(&fst, type, O_RDONLY);
304 	if (debug)
305 		warnx("quota_open(<%s, %s>, %d) returned %p",
306 		      fst.fs_file, fst.fs_mntops, type,
307 		      qf);
308 	if (qf == NULL)
309 		return (0);
310 
311 	rv = quota_read(qf, dqblk, id) == 0;
312 	quota_close(qf);
313 	if (debug)
314 		warnx("getfsquota(%d, %ld, %s, %p) -> %d",
315 		      type, id, path, dqblk, rv);
316 	return (rv);
317 }
318