xref: /netbsd/libexec/rpc.rquotad/rquotad.c (revision bf9ec67e)
1 /*	$NetBSD: rquotad.c,v 1.17 2001/01/10 01:50:05 lukem Exp $	*/
2 
3 /*
4  * by Manuel Bouyer (bouyer@ensta.fr)
5  *
6  * There is no copyright, you can use it as you want.
7  */
8 
9 #include <sys/cdefs.h>
10 #ifndef lint
11 __RCSID("$NetBSD: rquotad.c,v 1.17 2001/01/10 01:50:05 lukem Exp $");
12 #endif
13 
14 #include <sys/param.h>
15 #include <sys/types.h>
16 #include <sys/mount.h>
17 #include <sys/file.h>
18 #include <sys/stat.h>
19 #include <sys/socket.h>
20 #include <signal.h>
21 
22 #include <stdio.h>
23 #include <fstab.h>
24 #include <ctype.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <pwd.h>
28 #include <grp.h>
29 #include <errno.h>
30 #include <unistd.h>
31 
32 #include <syslog.h>
33 
34 #include <ufs/ufs/quota.h>
35 #include <rpc/rpc.h>
36 #include <rpcsvc/rquota.h>
37 #include <arpa/inet.h>
38 
39 void rquota_service(struct svc_req *request, SVCXPRT *transp);
40 void sendquota(struct svc_req *request, SVCXPRT *transp);
41 void printerr_reply(SVCXPRT *transp);
42 void initfs(void);
43 int getfsquota(long id, char *path, struct dqblk *dqblk);
44 int hasquota(struct fstab *fs, char **qfnamep);
45 void cleanup(int);
46 int main(int, char *[]);
47 
48 /*
49  * structure containing informations about ufs filesystems
50  * initialised by initfs()
51  */
52 struct fs_stat {
53 	struct fs_stat *fs_next;	/* next element */
54 	char   *fs_file;		/* mount point of the filesystem */
55 	char   *qfpathname;		/* pathname of the quota file */
56 	dev_t   st_dev;			/* device of the filesystem */
57 } fs_stat;
58 struct fs_stat *fs_begin = NULL;
59 
60 char *qfextension[] = INITQFNAMES;
61 int from_inetd = 1;
62 
63 void
64 cleanup(int dummy)
65 {
66 
67 	(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
68 	exit(0);
69 }
70 
71 int
72 main(int argc, char *argv[])
73 {
74 	SVCXPRT *transp;
75 	struct sockaddr_storage from;
76 	int fromlen;
77 
78 	fromlen = sizeof(from);
79 	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
80 		from_inetd = 0;
81 
82 	if (!from_inetd) {
83 		daemon(0, 0);
84 
85 		(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
86 
87 		(void) signal(SIGINT, cleanup);
88 		(void) signal(SIGTERM, cleanup);
89 		(void) signal(SIGHUP, cleanup);
90 	}
91 
92 	openlog("rpc.rquotad", LOG_PID, LOG_DAEMON);
93 
94 	/* create and register the service */
95 	if (from_inetd) {
96 		transp = svc_dg_create(0, 0, 0);
97 		if (transp == NULL) {
98 			syslog(LOG_ERR, "couldn't create udp service.");
99 			exit(1);
100 		}
101 		if (!svc_reg(transp, RQUOTAPROG, RQUOTAVERS, rquota_service,
102 		    NULL)) {
103 			syslog(LOG_ERR,
104 			    "unable to register (RQUOTAPROG, RQUOTAVERS).");
105 			exit(1);
106 		}
107 	} else {
108 		if (!svc_create(rquota_service, RQUOTAPROG, RQUOTAVERS, "udp")){
109 			syslog(LOG_ERR,
110 			    "unable to create (RQUOTAPROG, RQUOTAVERS).");
111 			exit(1);
112 		}
113 	}
114 
115 	initfs();		/* init the fs_stat list */
116 	svc_run();
117 	syslog(LOG_ERR, "svc_run returned");
118 	exit(1);
119 }
120 
121 void
122 rquota_service(struct svc_req *request, SVCXPRT *transp)
123 {
124 	switch (request->rq_proc) {
125 	case NULLPROC:
126 		(void)svc_sendreply(transp, xdr_void, (char *)NULL);
127 		break;
128 
129 	case RQUOTAPROC_GETQUOTA:
130 	case RQUOTAPROC_GETACTIVEQUOTA:
131 		sendquota(request, transp);
132 		break;
133 
134 	default:
135 		svcerr_noproc(transp);
136 		break;
137 	}
138 	if (from_inetd)
139 		exit(0);
140 }
141 
142 /* read quota for the specified id, and send it */
143 void
144 sendquota(struct svc_req *request, SVCXPRT *transp)
145 {
146 	struct getquota_args getq_args;
147 	struct getquota_rslt getq_rslt;
148 	struct dqblk dqblk;
149 	struct timeval timev;
150 
151 	memset((char *)&getq_args, 0, sizeof(getq_args));
152 	if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
153 		svcerr_decode(transp);
154 		return;
155 	}
156 	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
157 		/* bad auth */
158 		getq_rslt.status = Q_EPERM;
159 	} else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp,
160 	    &dqblk)) {
161 		/* failed, return noquota */
162 		getq_rslt.status = Q_NOQUOTA;
163 	} else {
164 		gettimeofday(&timev, NULL);
165 		getq_rslt.status = Q_OK;
166 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
167 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
168 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
169 		    dqblk.dqb_bhardlimit;
170 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
171 		    dqblk.dqb_bsoftlimit;
172 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
173 		    dqblk.dqb_curblocks;
174 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
175 		    dqblk.dqb_ihardlimit;
176 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
177 		    dqblk.dqb_isoftlimit;
178 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
179 		    dqblk.dqb_curinodes;
180 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
181 		    dqblk.dqb_btime - timev.tv_sec;
182 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
183 		    dqblk.dqb_itime - timev.tv_sec;
184 	}
185 	if (!svc_sendreply(transp, xdr_getquota_rslt, (char *)&getq_rslt))
186 		svcerr_systemerr(transp);
187 	if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
188 		syslog(LOG_ERR, "unable to free arguments");
189 		exit(1);
190 	}
191 }
192 
193 void
194 printerr_reply(SVCXPRT *transp)	/* when a reply to a request failed */
195 {
196 	char   *name;
197 	struct sockaddr_in *caller;
198 	int     save_errno;
199 
200 	save_errno = errno;
201 
202 	caller = svc_getcaller(transp);
203 	name = (char *)inet_ntoa(caller->sin_addr);
204 	errno = save_errno;
205 	if (errno == 0)
206 		syslog(LOG_WARNING, "couldn't send reply to %s", name);
207 	else
208 		syslog(LOG_WARNING, "couldn't send reply to %s: %m", name);
209 }
210 
211 /* initialise the fs_tab list from entries in /etc/fstab */
212 void
213 initfs()
214 {
215 	struct fs_stat *fs_current = NULL;
216 	struct fs_stat *fs_next = NULL;
217 	char *qfpathname;
218 	struct fstab *fs;
219 	struct stat st;
220 
221 	setfsent();
222 	while ((fs = getfsent())) {
223 		if (strcmp(fs->fs_vfstype, MOUNT_FFS))
224 			continue;
225 		if (!hasquota(fs, &qfpathname))
226 			continue;
227 
228 		fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
229 		if (fs_current == NULL) {
230 			syslog(LOG_ERR, "can't malloc: %m");
231 			exit(1);
232 		}
233 		fs_current->fs_next = fs_next;	/* next element */
234 
235 		fs_current->fs_file = strdup(fs->fs_file);
236 		if (fs_current->fs_file == NULL) {
237 			syslog(LOG_ERR, "can't strdup: %m");
238 			exit(1);
239 		}
240 
241 		fs_current->qfpathname = strdup(qfpathname);
242 		if (fs_current->qfpathname == NULL) {
243 			syslog(LOG_ERR, "can't strdup: %m");
244 			exit(1);
245 		}
246 
247 		stat(fs->fs_file, &st);
248 		fs_current->st_dev = st.st_dev;
249 
250 		fs_next = fs_current;
251 	}
252 	endfsent();
253 	fs_begin = fs_current;
254 }
255 
256 /*
257  * gets the quotas for id, filesystem path.
258  * Return 0 if fail, 1 otherwise
259  */
260 int
261 getfsquota(long id, char *path, struct dqblk *dqblk)
262 {
263 	struct stat st_path;
264 	struct fs_stat *fs;
265 	int	qcmd, fd, ret = 0;
266 
267 	if (stat(path, &st_path) < 0)
268 		return (0);
269 
270 	qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
271 
272 	for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
273 		/* where the device is the same as path */
274 		if (fs->st_dev != st_path.st_dev)
275 			continue;
276 
277 		/* find the specified filesystem. get and return quota */
278 		if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
279 			return (1);
280 
281 		if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
282 			syslog(LOG_WARNING, "open error: %s: %m",
283 			    fs->qfpathname);
284 			return (0);
285 		}
286 		if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), SEEK_SET)
287 		    == (off_t)-1) {
288 			close(fd);
289 			return (1);
290 		}
291 		switch (read(fd, dqblk, sizeof(struct dqblk))) {
292 		case 0:
293 			/*
294                          * Convert implicit 0 quota (EOF)
295                          * into an explicit one (zero'ed dqblk)
296                          */
297 			memset((caddr_t) dqblk, 0, sizeof(struct dqblk));
298 			ret = 1;
299 			break;
300 		case sizeof(struct dqblk):	/* OK */
301 			ret = 1;
302 			break;
303 		default:	/* ERROR */
304 			syslog(LOG_WARNING, "read error: %s: %m",
305 			    fs->qfpathname);
306 			close(fd);
307 			return (0);
308 		}
309 		close(fd);
310 	}
311 	return (ret);
312 }
313 
314 /*
315  * Check to see if a particular quota is to be enabled.
316  * Comes from quota.c, NetBSD 0.9
317  */
318 int
319 hasquota(struct fstab *fs, char **qfnamep)
320 {
321 	static char initname, usrname[100];
322 	static char buf[MAXPATHLEN];
323 	char	*opt, *cp = NULL;
324 
325 	if (!initname) {
326 		(void)snprintf(usrname, sizeof usrname, "%s%s",
327 		    qfextension[USRQUOTA], QUOTAFILENAME);
328 		initname = 1;
329 	}
330 	strncpy(buf, fs->fs_mntops, sizeof(buf) - 1);
331 	buf[sizeof(buf) - 1] = '\0';
332 	for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
333 		if ((cp = strchr(opt, '=')))
334 			*cp++ = '\0';
335 		if (strcmp(opt, usrname) == 0)
336 			break;
337 	}
338 	if (!opt)
339 		return (0);
340 	if (cp) {
341 		*qfnamep = cp;
342 		return (1);
343 	}
344 	(void)snprintf(buf, sizeof buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME,
345 	    qfextension[USRQUOTA]);
346 	*qfnamep = buf;
347 	return (1);
348 }
349