rquotad.c revision 90336 
1/*
2 * by Manuel Bouyer (bouyer@ensta.fr)
3 *
4 * There is no copyright, you can use it as you want.
5 */
6
7#ifndef lint
8static const char rcsid[] =
9  "$FreeBSD: head/libexec/rpc.rquotad/rquotad.c 90336 2002-02-07 05:24:53Z imp $";
10#endif /* not lint */
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 <ctype.h>
21#include <errno.h>
22#include <fstab.h>
23#include <grp.h>
24#include <pwd.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#include <unistd.h>
29
30#include <syslog.h>
31#include <varargs.h>
32
33#include <ufs/ufs/quota.h>
34#include <rpc/rpc.h>
35#include <rpc/pmap_clnt.h>
36#include <rpcsvc/rquota.h>
37#include <arpa/inet.h>
38
39void rquota_service(struct svc_req *request, SVCXPRT *transp);
40void sendquota(struct svc_req *request, SVCXPRT *transp);
41void printerr_reply(SVCXPRT *transp);
42void initfs(void);
43int getfsquota(long id, char *path, struct dqblk *dqblk);
44int hasquota(struct fstab *fs, char **qfnamep);
45
46/*
47 * structure containing informations about ufs filesystems
48 * initialised by initfs()
49 */
50struct fs_stat {
51	struct fs_stat *fs_next;	/* next element */
52	char   *fs_file;		/* mount point of the filesystem */
53	char   *qfpathname;		/* pathname of the quota file */
54	dev_t   st_dev;			/* device of the filesystem */
55} fs_stat;
56struct fs_stat *fs_begin = NULL;
57
58int from_inetd = 1;
59
60void
61cleanup(int sig)
62{
63	(void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
64	exit(0);
65}
66
67int
68main(int argc, char *argv[])
69{
70	SVCXPRT *transp;
71	int sock = 0;
72	int proto = 0;
73	struct sockaddr_in from;
74	int fromlen;
75
76	fromlen = sizeof(from);
77	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
78		from_inetd = 0;
79		sock = RPC_ANYSOCK;
80		proto = IPPROTO_UDP;
81	}
82
83	if (!from_inetd) {
84		daemon(0, 0);
85
86		(void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
87
88		(void) signal(SIGINT, cleanup);
89		(void) signal(SIGTERM, cleanup);
90		(void) signal(SIGHUP, cleanup);
91	}
92
93	openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
94
95	/* create and register the service */
96	transp = svcudp_create(sock);
97	if (transp == NULL) {
98		syslog(LOG_ERR, "couldn't create udp service");
99		exit(1);
100	}
101	if (!svc_register(transp, RQUOTAPROG, RQUOTAVERS, rquota_service, proto)) {
102		syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", proto?"udp":"(inetd)");
103		exit(1);
104	}
105
106	initfs();		/* init the fs_stat list */
107	svc_run();
108	syslog(LOG_ERR, "svc_run returned");
109	exit(1);
110}
111
112void
113rquota_service(struct svc_req *request, SVCXPRT *transp)
114{
115	switch (request->rq_proc) {
116	case NULLPROC:
117		(void)svc_sendreply(transp, xdr_void, (char *)NULL);
118		break;
119
120	case RQUOTAPROC_GETQUOTA:
121	case RQUOTAPROC_GETACTIVEQUOTA:
122		sendquota(request, transp);
123		break;
124
125	default:
126		svcerr_noproc(transp);
127		break;
128	}
129	if (from_inetd)
130		exit(0);
131}
132
133/* read quota for the specified id, and send it */
134void
135sendquota(struct svc_req *request, SVCXPRT *transp)
136{
137	struct getquota_args getq_args;
138	struct getquota_rslt getq_rslt;
139	struct dqblk dqblk;
140	struct timeval timev;
141
142	bzero((char *)&getq_args, sizeof(getq_args));
143	if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
144		svcerr_decode(transp);
145		return;
146	}
147	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
148		/* bad auth */
149		getq_rslt.status = Q_EPERM;
150	} else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
151		/* failed, return noquota */
152		getq_rslt.status = Q_NOQUOTA;
153	} else {
154		gettimeofday(&timev, NULL);
155		getq_rslt.status = Q_OK;
156		getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
157		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
158		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
159		    dqblk.dqb_bhardlimit;
160		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
161		    dqblk.dqb_bsoftlimit;
162		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
163		    dqblk.dqb_curblocks;
164		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
165		    dqblk.dqb_ihardlimit;
166		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
167		    dqblk.dqb_isoftlimit;
168		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
169		    dqblk.dqb_curinodes;
170		getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
171		    dqblk.dqb_btime - timev.tv_sec;
172		getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
173		    dqblk.dqb_itime - timev.tv_sec;
174	}
175	if (!svc_sendreply(transp, xdr_getquota_rslt, (char *)&getq_rslt)) {
176		svcerr_systemerr(transp);
177	}
178	if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
179		syslog(LOG_ERR, "unable to free arguments");
180		exit(1);
181	}
182}
183
184void
185printerr_reply(SVCXPRT *transp)	/* when a reply to a request failed */
186{
187	char   *name;
188	struct sockaddr_in *caller;
189	int     save_errno;
190
191	save_errno = errno;
192
193	caller = svc_getcaller(transp);
194	name = (char *)inet_ntoa(caller->sin_addr);
195	errno = save_errno;
196	if (errno == 0)
197		syslog(LOG_ERR, "couldn't send reply to %s", name);
198	else
199		syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
200}
201
202/* initialise the fs_tab list from entries in /etc/fstab */
203void
204initfs(void)
205{
206	struct fs_stat *fs_current = NULL;
207	struct fs_stat *fs_next = NULL;
208	char *qfpathname;
209	struct fstab *fs;
210	struct stat st;
211
212	setfsent();
213	while ((fs = getfsent())) {
214		if (strcmp(fs->fs_vfstype, "ufs"))
215			continue;
216		if (!hasquota(fs, &qfpathname))
217			continue;
218
219		fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
220		fs_current->fs_next = fs_next;	/* next element */
221
222		fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
223		strcpy(fs_current->fs_file, fs->fs_file);
224
225		fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
226		strcpy(fs_current->qfpathname, qfpathname);
227
228		stat(fs_current->fs_file, &st);
229		fs_current->st_dev = st.st_dev;
230
231		fs_next = fs_current;
232	}
233	endfsent();
234	fs_begin = fs_current;
235}
236
237/*
238 * gets the quotas for id, filesystem path.
239 * Return 0 if fail, 1 otherwise
240 */
241int
242getfsquota(long id, char   *path, struct dqblk *dqblk)
243{
244	struct stat st_path;
245	struct fs_stat *fs;
246	int	qcmd, fd, ret = 0;
247
248	if (stat(path, &st_path) < 0)
249		return (0);
250
251	qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
252
253	for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
254		/* where the devise is the same as path */
255		if (fs->st_dev != st_path.st_dev)
256			continue;
257
258		/* find the specified filesystem. get and return quota */
259		if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
260			return (1);
261
262		if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
263			syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
264			return (0);
265		}
266		if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) {
267			close(fd);
268			return (1);
269		}
270		switch (read(fd, dqblk, sizeof(struct dqblk))) {
271		case 0:
272			/*
273                         * Convert implicit 0 quota (EOF)
274                         * into an explicit one (zero'ed dqblk)
275                         */
276			bzero((caddr_t) dqblk, sizeof(struct dqblk));
277			ret = 1;
278			break;
279		case sizeof(struct dqblk):	/* OK */
280			ret = 1;
281			break;
282		default:	/* ERROR */
283			syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
284			close(fd);
285			return (0);
286		}
287		close(fd);
288	}
289	return (ret);
290}
291
292/*
293 * Check to see if a particular quota is to be enabled.
294 * Comes from quota.c, NetBSD 0.9
295 */
296int
297hasquota(struct fstab *fs, char  **qfnamep)
298{
299	static char initname, usrname[100];
300	static char buf[BUFSIZ];
301	char	*opt, *cp;
302	char	*qfextension[] = INITQFNAMES;
303
304	if (!initname) {
305		sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
306		initname = 1;
307	}
308	strcpy(buf, fs->fs_mntops);
309	for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
310		if ((cp = index(opt, '=')))
311			*cp++ = '\0';
312		if (strcmp(opt, usrname) == 0)
313			break;
314	}
315	if (!opt)
316		return (0);
317	if (cp) {
318		*qfnamep = cp;
319		return (1);
320	}
321	sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
322	*qfnamep = buf;
323	return (1);
324}
325