xref: /dragonfly/libexec/rpc.rquotad/rquotad.c (revision 0bb9290e) 
1 /*
2  * by Manuel Bouyer (bouyer@ensta.fr)
3  *
4  * There is no copyright, you can use it as you want.
5  *
6  * $FreeBSD: src/libexec/rpc.rquotad/rquotad.c,v 1.3.2.1 2001/07/02 23:46:27 mikeh Exp $
7  * $DragonFly: src/libexec/rpc.rquotad/rquotad.c,v 1.5 2006/04/03 01:59:27 dillon Exp $
8  */
9 
10 #include <sys/param.h>
11 #include <sys/types.h>
12 #include <sys/mount.h>
13 #include <sys/file.h>
14 #include <sys/stat.h>
15 #include <sys/socket.h>
16 #include <signal.h>
17 
18 #include <ctype.h>
19 #include <errno.h>
20 #include <fstab.h>
21 #include <grp.h>
22 #include <pwd.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27 
28 #include <syslog.h>
29 #include <varargs.h>
30 
31 #include <vfs/ufs/quota.h>
32 #include <rpc/rpc.h>
33 #include <rpc/pmap_clnt.h>
34 #include <rpcsvc/rquota.h>
35 #include <arpa/inet.h>
36 
37 void rquota_service (struct svc_req *request, SVCXPRT *transp);
38 void sendquota (struct svc_req *request, SVCXPRT *transp);
39 void printerr_reply (SVCXPRT *transp);
40 void initfs (void);
41 int getfsquota (long id, char *path, struct ufs_dqblk *dqblk);
42 int hasquota (struct fstab *fs, char **qfnamep);
43 
44 /*
45  * structure containing informations about ufs filesystems
46  * initialised by initfs()
47  */
48 struct fs_stat {
49 	struct fs_stat *fs_next;	/* next element */
50 	char   *fs_file;		/* mount point of the filesystem */
51 	char   *qfpathname;		/* pathname of the quota file */
52 	dev_t   st_dev;			/* device of the filesystem */
53 } fs_stat;
54 struct fs_stat *fs_begin = NULL;
55 
56 int from_inetd = 1;
57 
58 void
59 cleanup()
60 {
61 	(void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
62 	exit(0);
63 }
64 
65 int
66 main(argc, argv)
67 	int     argc;
68 	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 
112 void
113 rquota_service(request, transp)
114 	struct svc_req *request;
115 	SVCXPRT *transp;
116 {
117 	switch (request->rq_proc) {
118 	case NULLPROC:
119 		(void)svc_sendreply(transp, 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 */
136 void
137 sendquota(request, transp)
138 	struct svc_req *request;
139 	SVCXPRT *transp;
140 {
141 	struct getquota_args getq_args;
142 	struct getquota_rslt getq_rslt;
143 	struct ufs_dqblk dqblk;
144 	struct timeval timev;
145 
146 	bzero((char *)&getq_args, sizeof(getq_args));
147 	if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
148 		svcerr_decode(transp);
149 		return;
150 	}
151 	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
152 		/* bad auth */
153 		getq_rslt.status = Q_EPERM;
154 	} else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
155 		/* failed, return noquota */
156 		getq_rslt.status = Q_NOQUOTA;
157 	} else {
158 		gettimeofday(&timev, NULL);
159 		getq_rslt.status = Q_OK;
160 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
161 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
162 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
163 		    dqblk.dqb_bhardlimit;
164 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
165 		    dqblk.dqb_bsoftlimit;
166 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
167 		    dqblk.dqb_curblocks;
168 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
169 		    dqblk.dqb_ihardlimit;
170 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
171 		    dqblk.dqb_isoftlimit;
172 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
173 		    dqblk.dqb_curinodes;
174 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
175 		    dqblk.dqb_btime - timev.tv_sec;
176 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
177 		    dqblk.dqb_itime - timev.tv_sec;
178 	}
179 	if (!svc_sendreply(transp, xdr_getquota_rslt, (char *)&getq_rslt)) {
180 		svcerr_systemerr(transp);
181 	}
182 	if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
183 		syslog(LOG_ERR, "unable to free arguments");
184 		exit(1);
185 	}
186 }
187 
188 void
189 printerr_reply(transp)	/* when a reply to a request failed */
190 	SVCXPRT *transp;
191 {
192 	char   *name;
193 	struct sockaddr_in *caller;
194 	int     save_errno;
195 
196 	save_errno = errno;
197 
198 	caller = svc_getcaller(transp);
199 	name = (char *)inet_ntoa(caller->sin_addr);
200 	errno = save_errno;
201 	if (errno == 0)
202 		syslog(LOG_ERR, "couldn't send reply to %s", name);
203 	else
204 		syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
205 }
206 
207 /* initialise the fs_tab list from entries in /etc/fstab */
208 void
209 initfs()
210 {
211 	struct fs_stat *fs_current = NULL;
212 	struct fs_stat *fs_next = NULL;
213 	char *qfpathname;
214 	struct fstab *fs;
215 	struct stat st;
216 
217 	setfsent();
218 	while ((fs = getfsent())) {
219 		if (strcmp(fs->fs_vfstype, "ufs"))
220 			continue;
221 		if (!hasquota(fs, &qfpathname))
222 			continue;
223 
224 		fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
225 		fs_current->fs_next = fs_next;	/* next element */
226 
227 		fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
228 		strcpy(fs_current->fs_file, fs->fs_file);
229 
230 		fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
231 		strcpy(fs_current->qfpathname, qfpathname);
232 
233 		stat(fs_current->fs_file, &st);
234 		fs_current->st_dev = st.st_dev;
235 
236 		fs_next = fs_current;
237 	}
238 	endfsent();
239 	fs_begin = fs_current;
240 }
241 
242 /*
243  * gets the quotas for id, filesystem path.
244  * Return 0 if fail, 1 otherwise
245  */
246 int
247 getfsquota(id, path, dqblk)
248 	long id;
249 	char   *path;
250 	struct ufs_dqblk *dqblk;
251 {
252 	struct stat st_path;
253 	struct fs_stat *fs;
254 	int	qcmd, fd, ret = 0;
255 
256 	if (stat(path, &st_path) < 0)
257 		return (0);
258 
259 	qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
260 
261 	for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
262 		/* where the devise is the same as path */
263 		if (fs->st_dev != st_path.st_dev)
264 			continue;
265 
266 		/* find the specified filesystem. get and return quota */
267 		if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
268 			return (1);
269 
270 		if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
271 			syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
272 			return (0);
273 		}
274 		if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) {
275 			close(fd);
276 			return (1);
277 		}
278 		switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) {
279 		case 0:
280 			/*
281                          * Convert implicit 0 quota (EOF)
282                          * into an explicit one (zero'ed dqblk)
283                          */
284 			bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk));
285 			ret = 1;
286 			break;
287 		case sizeof(struct ufs_dqblk):	/* OK */
288 			ret = 1;
289 			break;
290 		default:	/* ERROR */
291 			syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
292 			close(fd);
293 			return (0);
294 		}
295 		close(fd);
296 	}
297 	return (ret);
298 }
299 
300 /*
301  * Check to see if a particular quota is to be enabled.
302  * Comes from quota.c, NetBSD 0.9
303  */
304 int
305 hasquota(fs, qfnamep)
306 	struct fstab *fs;
307 	char  **qfnamep;
308 {
309 	static char initname, usrname[100];
310 	static char buf[BUFSIZ];
311 	char	*opt, *cp;
312 	char	*qfextension[] = INITQFNAMES;
313 
314 	if (!initname) {
315 		sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
316 		initname = 1;
317 	}
318 	strcpy(buf, fs->fs_mntops);
319 	for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
320 		if ((cp = index(opt, '=')))
321 			*cp++ = '\0';
322 		if (strcmp(opt, usrname) == 0)
323 			break;
324 	}
325 	if (!opt)
326 		return (0);
327 	if (cp) {
328 		*qfnamep = cp;
329 		return (1);
330 	}
331 	sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
332 	*qfnamep = buf;
333 	return (1);
334 }
335