xref: /dragonfly/libexec/rpc.rquotad/rquotad.c (revision 9348a738) 
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 1.6 2008/11/19 18:41:30 swildner 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 
30 #include <vfs/ufs/quota.h>
31 #include <rpc/rpc.h>
32 #include <rpcsvc/rquota.h>
33 #include <arpa/inet.h>
34 #include <netdb.h>
35 
36 static void cleanup(int);
37 static void rquota_service(struct svc_req *request, SVCXPRT *transp);
38 static void sendquota(struct svc_req *request, SVCXPRT *transp);
39 static void initfs(void);
40 static int getfsquota(long id, char *path, struct ufs_dqblk *dqblk);
41 static int hasquota(struct fstab *fs, char **qfnamep);
42 
43 /*
44  * structure containing informations about ufs filesystems
45  * initialised by initfs()
46  */
47 struct fs_stat {
48 	struct fs_stat *fs_next;	/* next element */
49 	char   *fs_file;		/* mount point of the filesystem */
50 	char   *qfpathname;		/* pathname of the quota file */
51 	dev_t   st_dev;			/* device of the filesystem */
52 } fs_stat;
53 struct fs_stat *fs_begin = NULL;
54 
55 int from_inetd = 1;
56 
57 void
58 cleanup(int signo __unused)
59 {
60 	(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
61 	exit(0);
62 }
63 
64 int
65 main(void)
66 {
67 	SVCXPRT *transp;
68 	int ok;
69 	struct sockaddr_storage from;
70 	int fromlen;
71 
72 	fromlen = sizeof(from);
73 	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
74 		from_inetd = 0;
75 	}
76 
77 	if (!from_inetd) {
78 		daemon(0, 0);
79 
80 		(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
81 
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 		ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
97 			     rquota_service, NULL);
98 	} else
99 		ok = svc_create(rquota_service,
100 				RQUOTAPROG, RQUOTAVERS, "udp");
101 	if (!ok) {
102 		syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"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(struct svc_req *request, SVCXPRT *transp)
114 {
115 	switch (request->rq_proc) {
116 	case NULLPROC:
117 		(void)svc_sendreply(transp, (xdrproc_t)xdr_void, 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 */
134 void
135 sendquota(struct svc_req *request, SVCXPRT *transp)
136 {
137 	struct getquota_args getq_args;
138 	struct getquota_rslt getq_rslt;
139 	struct ufs_dqblk dqblk;
140 	struct timeval timev;
141 
142 	bzero((char *)&getq_args, sizeof(getq_args));
143 	if (!svc_getargs(transp, (xdrproc_t)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, (xdrproc_t)xdr_getquota_rslt, (char *)&getq_rslt)) {
176 		svcerr_systemerr(transp);
177 	}
178 	if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) {
179 		syslog(LOG_ERR, "unable to free arguments");
180 		exit(1);
181 	}
182 }
183 
184 /* initialise the fs_tab list from entries in /etc/fstab */
185 void
186 initfs(void)
187 {
188 	struct fs_stat *fs_current = NULL;
189 	struct fs_stat *fs_next = NULL;
190 	char *qfpathname;
191 	struct fstab *fs;
192 	struct stat st;
193 
194 	setfsent();
195 	while ((fs = getfsent())) {
196 		if (strcmp(fs->fs_vfstype, "ufs"))
197 			continue;
198 		if (!hasquota(fs, &qfpathname))
199 			continue;
200 
201 		fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
202 		fs_current->fs_next = fs_next;	/* next element */
203 
204 		fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
205 		strcpy(fs_current->fs_file, fs->fs_file);
206 
207 		fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
208 		strcpy(fs_current->qfpathname, qfpathname);
209 
210 		stat(fs_current->fs_file, &st);
211 		fs_current->st_dev = st.st_dev;
212 
213 		fs_next = fs_current;
214 	}
215 	endfsent();
216 	fs_begin = fs_current;
217 }
218 
219 /*
220  * gets the quotas for id, filesystem path.
221  * Return 0 if fail, 1 otherwise
222  */
223 int
224 getfsquota(long id, char *path, struct ufs_dqblk *dqblk)
225 {
226 	struct stat st_path;
227 	struct fs_stat *fs;
228 	int	qcmd, fd, ret = 0;
229 
230 	if (stat(path, &st_path) < 0)
231 		return (0);
232 
233 	qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
234 
235 	for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
236 		/* where the devise is the same as path */
237 		if (fs->st_dev != st_path.st_dev)
238 			continue;
239 
240 		/* find the specified filesystem. get and return quota */
241 		if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
242 			return (1);
243 
244 		if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
245 			syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
246 			return (0);
247 		}
248 		if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) {
249 			close(fd);
250 			return (1);
251 		}
252 		switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) {
253 		case 0:
254 			/*
255                          * Convert implicit 0 quota (EOF)
256                          * into an explicit one (zero'ed dqblk)
257                          */
258 			bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk));
259 			ret = 1;
260 			break;
261 		case sizeof(struct ufs_dqblk):	/* OK */
262 			ret = 1;
263 			break;
264 		default:	/* ERROR */
265 			syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
266 			close(fd);
267 			return (0);
268 		}
269 		close(fd);
270 	}
271 	return (ret);
272 }
273 
274 /*
275  * Check to see if a particular quota is to be enabled.
276  * Comes from quota.c, NetBSD 0.9
277  */
278 int
279 hasquota(struct fstab *fs, char **qfnamep)
280 {
281 	static char initname, usrname[100];
282 	static char buf[BUFSIZ];
283 	char	*opt, *cp;
284 	const char *qfextension[] = INITQFNAMES;
285 
286 	if (!initname) {
287 		sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
288 		initname = 1;
289 	}
290 	strcpy(buf, fs->fs_mntops);
291 	for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
292 		if ((cp = index(opt, '=')))
293 			*cp++ = '\0';
294 		if (strcmp(opt, usrname) == 0)
295 			break;
296 	}
297 	if (!opt)
298 		return (0);
299 	if (cp) {
300 		*qfnamep = cp;
301 		return (1);
302 	}
303 	sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
304 	*qfnamep = buf;
305 	return (1);
306 }
307