rquotad.c revision 141918 
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 141918 2005-02-14 17:42:58Z stefanf $";
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
32#include <ufs/ufs/quota.h>
33#include <rpc/rpc.h>
34#include <rpcsvc/rquota.h>
35#include <arpa/inet.h>
36#include <netdb.h>
37
38void rquota_service(struct svc_req *request, SVCXPRT *transp);
39void sendquota(struct svc_req *request, SVCXPRT *transp);
40void printerr_reply(SVCXPRT *transp);
41void initfs(void);
42int getfsquota(long id, char *path, struct dqblk *dqblk);
43int hasquota(struct fstab *fs, char **qfnamep);
44
45/*
46 * structure containing informations about ufs filesystems
47 * initialised by initfs()
48 */
49struct fs_stat {
50	struct fs_stat *fs_next;	/* next element */
51	char   *fs_file;		/* mount point of the filesystem */
52	char   *qfpathname;		/* pathname of the quota file */
53	dev_t   st_dev;			/* device of the filesystem */
54} fs_stat;
55struct fs_stat *fs_begin = NULL;
56
57int from_inetd = 1;
58
59void
60cleanup(int sig)
61{
62	(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
63	exit(0);
64}
65
66int
67main(int argc, char *argv[])
68{
69	SVCXPRT *transp;
70	int ok;
71	struct sockaddr_storage from;
72	socklen_t fromlen;
73
74	fromlen = sizeof(from);
75	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
76		from_inetd = 0;
77	}
78
79	if (!from_inetd) {
80		daemon(0, 0);
81
82		(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
83
84		(void) signal(SIGINT, cleanup);
85		(void) signal(SIGTERM, cleanup);
86		(void) signal(SIGHUP, cleanup);
87	}
88
89	openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
90
91	/* create and register the service */
92	if (from_inetd) {
93		transp = svc_tli_create(0, NULL, NULL, 0, 0);
94		if (transp == NULL) {
95			syslog(LOG_ERR, "couldn't create udp service.");
96			exit(1);
97		}
98		ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
99			     rquota_service, NULL);
100	} else
101		ok = svc_create(rquota_service,
102				RQUOTAPROG, RQUOTAVERS, "udp");
103	if (!ok) {
104		syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"udp":"(inetd)");
105		exit(1);
106	}
107
108	initfs();		/* init the fs_stat list */
109	svc_run();
110	syslog(LOG_ERR, "svc_run returned");
111	exit(1);
112}
113
114void
115rquota_service(struct svc_req *request, SVCXPRT *transp)
116{
117	switch (request->rq_proc) {
118	case NULLPROC:
119		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL);
120		break;
121
122	case RQUOTAPROC_GETQUOTA:
123	case RQUOTAPROC_GETACTIVEQUOTA:
124		sendquota(request, transp);
125		break;
126
127	default:
128		svcerr_noproc(transp);
129		break;
130	}
131	if (from_inetd)
132		exit(0);
133}
134
135/* read quota for the specified id, and send it */
136void
137sendquota(struct svc_req *request, SVCXPRT *transp)
138{
139	struct getquota_args getq_args;
140	struct getquota_rslt getq_rslt;
141	struct dqblk dqblk;
142	struct timeval timev;
143
144	bzero((char *)&getq_args, sizeof(getq_args));
145	if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
146		svcerr_decode(transp);
147		return;
148	}
149	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
150		/* bad auth */
151		getq_rslt.status = Q_EPERM;
152	} else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
153		/* failed, return noquota */
154		getq_rslt.status = Q_NOQUOTA;
155	} else {
156		gettimeofday(&timev, NULL);
157		getq_rslt.status = Q_OK;
158		getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
159		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
160		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
161		    dqblk.dqb_bhardlimit;
162		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
163		    dqblk.dqb_bsoftlimit;
164		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
165		    dqblk.dqb_curblocks;
166		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
167		    dqblk.dqb_ihardlimit;
168		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
169		    dqblk.dqb_isoftlimit;
170		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
171		    dqblk.dqb_curinodes;
172		getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
173		    dqblk.dqb_btime - timev.tv_sec;
174		getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
175		    dqblk.dqb_itime - timev.tv_sec;
176	}
177	if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt)) {
178		svcerr_systemerr(transp);
179	}
180	if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
181		syslog(LOG_ERR, "unable to free arguments");
182		exit(1);
183	}
184}
185
186void
187printerr_reply(SVCXPRT *transp)	/* when a reply to a request failed */
188{
189	char name[INET6_ADDRSTRLEN];
190	struct sockaddr *caller;
191	int     save_errno;
192
193	save_errno = errno;
194
195	caller = (struct sockaddr *)svc_getrpccaller(transp)->buf;
196	getnameinfo(caller, caller->sa_len, name, sizeof (name),
197		    NULL, 0, NI_NUMERICHOST);
198	errno = save_errno;
199	if (errno == 0)
200		syslog(LOG_ERR, "couldn't send reply to %s", name);
201	else
202		syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
203}
204
205/* initialise the fs_tab list from entries in /etc/fstab */
206void
207initfs(void)
208{
209	struct fs_stat *fs_current = NULL;
210	struct fs_stat *fs_next = NULL;
211	char *qfpathname;
212	struct fstab *fs;
213	struct stat st;
214
215	setfsent();
216	while ((fs = getfsent())) {
217		if (strcmp(fs->fs_vfstype, "ufs"))
218			continue;
219		if (!hasquota(fs, &qfpathname))
220			continue;
221
222		fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
223		fs_current->fs_next = fs_next;	/* next element */
224
225		fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
226		strcpy(fs_current->fs_file, fs->fs_file);
227
228		fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
229		strcpy(fs_current->qfpathname, qfpathname);
230
231		stat(fs_current->fs_file, &st);
232		fs_current->st_dev = st.st_dev;
233
234		fs_next = fs_current;
235	}
236	endfsent();
237	fs_begin = fs_current;
238}
239
240/*
241 * gets the quotas for id, filesystem path.
242 * Return 0 if fail, 1 otherwise
243 */
244int
245getfsquota(long id, char   *path, struct dqblk *dqblk)
246{
247	struct stat st_path;
248	struct fs_stat *fs;
249	int	qcmd, fd, ret = 0;
250
251	if (stat(path, &st_path) < 0)
252		return (0);
253
254	qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
255
256	for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
257		/* where the devise is the same as path */
258		if (fs->st_dev != st_path.st_dev)
259			continue;
260
261		/* find the specified filesystem. get and return quota */
262		if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
263			return (1);
264
265		if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
266			syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
267			return (0);
268		}
269		if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) {
270			close(fd);
271			return (1);
272		}
273		switch (read(fd, dqblk, sizeof(struct dqblk))) {
274		case 0:
275			/*
276                         * Convert implicit 0 quota (EOF)
277                         * into an explicit one (zero'ed dqblk)
278                         */
279			bzero(dqblk, sizeof(struct dqblk));
280			ret = 1;
281			break;
282		case sizeof(struct dqblk):	/* OK */
283			ret = 1;
284			break;
285		default:	/* ERROR */
286			syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
287			close(fd);
288			return (0);
289		}
290		close(fd);
291	}
292	return (ret);
293}
294
295/*
296 * Check to see if a particular quota is to be enabled.
297 * Comes from quota.c, NetBSD 0.9
298 */
299int
300hasquota(struct fstab *fs, char  **qfnamep)
301{
302	static char initname, usrname[100];
303	static char buf[BUFSIZ];
304	char	*opt, *cp;
305	char	*qfextension[] = INITQFNAMES;
306
307	if (!initname) {
308		sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
309		initname = 1;
310	}
311	strcpy(buf, fs->fs_mntops);
312	for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
313		if ((cp = index(opt, '=')))
314			*cp++ = '\0';
315		if (strcmp(opt, usrname) == 0)
316			break;
317	}
318	if (!opt)
319		return (0);
320	if (cp) {
321		*qfnamep = cp;
322		return (1);
323	}
324	sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
325	*qfnamep = buf;
326	return (1);
327}
328