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 */
8
9 #include <sys/param.h>
10 #include <sys/types.h>
11 #include <sys/mount.h>
12 #include <sys/stat.h>
13 #include <sys/socket.h>
14 #include <signal.h>
15
16 #include <ctype.h>
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <fstab.h>
20 #include <grp.h>
21 #include <pwd.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <unistd.h>
26
27 #include <syslog.h>
28
29 #include <vfs/ufs/quota.h>
30 #include <rpc/rpc.h>
31 #include <rpcsvc/rquota.h>
32 #include <arpa/inet.h>
33 #include <netdb.h>
34
35 static void cleanup(int);
36 static void rquota_service(struct svc_req *request, SVCXPRT *transp);
37 static void sendquota(struct svc_req *request, SVCXPRT *transp);
38 static void initfs(void);
39 static int getfsquota(long id, char *path, struct ufs_dqblk *dqblk);
40 static int hasquota(struct fstab *fs, char **qfnamep);
41
42 /*
43 * structure containing informations about ufs filesystems
44 * initialised by initfs()
45 */
46 struct fs_stat {
47 struct fs_stat *fs_next; /* next element */
48 char *fs_file; /* mount point of the filesystem */
49 char *qfpathname; /* pathname of the quota file */
50 dev_t st_dev; /* device of the filesystem */
51 } fs_stat;
52 struct fs_stat *fs_begin = NULL;
53
54 int from_inetd = 1;
55
56 void
cleanup(int signo __unused)57 cleanup(int signo __unused)
58 {
59 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
60 exit(0);
61 }
62
63 int
main(void)64 main(void)
65 {
66 SVCXPRT *transp;
67 int ok;
68 struct sockaddr_storage from;
69 int fromlen;
70
71 fromlen = sizeof(from);
72 if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
73 from_inetd = 0;
74 }
75
76 if (!from_inetd) {
77 daemon(0, 0);
78
79 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
80
81 (void) signal(SIGINT, cleanup);
82 (void) signal(SIGTERM, cleanup);
83 (void) signal(SIGHUP, cleanup);
84 }
85
86 openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
87
88 /* create and register the service */
89 if (from_inetd) {
90 transp = svc_tli_create(0, NULL, NULL, 0, 0);
91 if (transp == NULL) {
92 syslog(LOG_ERR, "couldn't create udp service.");
93 exit(1);
94 }
95 ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
96 rquota_service, NULL);
97 } else
98 ok = svc_create(rquota_service,
99 RQUOTAPROG, RQUOTAVERS, "udp");
100 if (!ok) {
101 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"udp":"(inetd)");
102 exit(1);
103 }
104
105 initfs(); /* init the fs_stat list */
106 svc_run();
107 syslog(LOG_ERR, "svc_run returned");
108 exit(1);
109 }
110
111 void
rquota_service(struct svc_req * request,SVCXPRT * transp)112 rquota_service(struct svc_req *request, SVCXPRT *transp)
113 {
114 switch (request->rq_proc) {
115 case NULLPROC:
116 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
117 break;
118
119 case RQUOTAPROC_GETQUOTA:
120 case RQUOTAPROC_GETACTIVEQUOTA:
121 sendquota(request, transp);
122 break;
123
124 default:
125 svcerr_noproc(transp);
126 break;
127 }
128 if (from_inetd)
129 exit(0);
130 }
131
132 /* read quota for the specified id, and send it */
133 void
sendquota(struct svc_req * request,SVCXPRT * transp)134 sendquota(struct svc_req *request, SVCXPRT *transp)
135 {
136 struct getquota_args getq_args;
137 struct getquota_rslt getq_rslt;
138 struct ufs_dqblk dqblk;
139 struct timeval timev;
140
141 bzero((char *)&getq_args, sizeof(getq_args));
142 if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) {
143 svcerr_decode(transp);
144 return;
145 }
146 if (request->rq_cred.oa_flavor != AUTH_UNIX) {
147 /* bad auth */
148 getq_rslt.status = Q_EPERM;
149 } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
150 /* failed, return noquota */
151 getq_rslt.status = Q_NOQUOTA;
152 } else {
153 gettimeofday(&timev, NULL);
154 getq_rslt.status = Q_OK;
155 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
156 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
157 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
158 dqblk.dqb_bhardlimit;
159 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
160 dqblk.dqb_bsoftlimit;
161 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
162 dqblk.dqb_curblocks;
163 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
164 dqblk.dqb_ihardlimit;
165 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
166 dqblk.dqb_isoftlimit;
167 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
168 dqblk.dqb_curinodes;
169 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
170 dqblk.dqb_btime - timev.tv_sec;
171 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
172 dqblk.dqb_itime - timev.tv_sec;
173 }
174 if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, (char *)&getq_rslt)) {
175 svcerr_systemerr(transp);
176 }
177 if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) {
178 syslog(LOG_ERR, "unable to free arguments");
179 exit(1);
180 }
181 }
182
183 /* initialise the fs_tab list from entries in /etc/fstab */
184 void
initfs(void)185 initfs(void)
186 {
187 struct fs_stat *fs_current = NULL;
188 struct fs_stat *fs_next = NULL;
189 char *qfpathname;
190 struct fstab *fs;
191 struct stat st;
192
193 setfsent();
194 while ((fs = getfsent())) {
195 if (strcmp(fs->fs_vfstype, "ufs"))
196 continue;
197 if (!hasquota(fs, &qfpathname))
198 continue;
199
200 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
201 fs_current->fs_next = fs_next; /* next element */
202
203 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
204 strcpy(fs_current->fs_file, fs->fs_file);
205
206 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
207 strcpy(fs_current->qfpathname, qfpathname);
208
209 stat(fs_current->fs_file, &st);
210 fs_current->st_dev = st.st_dev;
211
212 fs_next = fs_current;
213 }
214 endfsent();
215 fs_begin = fs_current;
216 }
217
218 /*
219 * gets the quotas for id, filesystem path.
220 * Return 0 if fail, 1 otherwise
221 */
222 int
getfsquota(long id,char * path,struct ufs_dqblk * dqblk)223 getfsquota(long id, char *path, struct ufs_dqblk *dqblk)
224 {
225 struct stat st_path;
226 struct fs_stat *fs;
227 int qcmd, fd, ret = 0;
228
229 if (stat(path, &st_path) < 0)
230 return (0);
231
232 qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
233
234 for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
235 /* where the devise is the same as path */
236 if (fs->st_dev != st_path.st_dev)
237 continue;
238
239 /* find the specified filesystem. get and return quota */
240 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
241 return (1);
242
243 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
244 syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
245 return (0);
246 }
247 if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) {
248 close(fd);
249 return (1);
250 }
251 switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) {
252 case 0:
253 /*
254 * Convert implicit 0 quota (EOF)
255 * into an explicit one (zero'ed dqblk)
256 */
257 bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk));
258 ret = 1;
259 break;
260 case sizeof(struct ufs_dqblk): /* OK */
261 ret = 1;
262 break;
263 default: /* ERROR */
264 syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
265 close(fd);
266 return (0);
267 }
268 close(fd);
269 }
270 return (ret);
271 }
272
273 /*
274 * Check to see if a particular quota is to be enabled.
275 * Comes from quota.c, NetBSD 0.9
276 */
277 int
hasquota(struct fstab * fs,char ** qfnamep)278 hasquota(struct fstab *fs, char **qfnamep)
279 {
280 static char initname, usrname[100];
281 static char buf[BUFSIZ];
282 char *opt, *cp;
283 const char *qfextension[] = INITQFNAMES;
284
285 if (!initname) {
286 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
287 initname = 1;
288 }
289 strcpy(buf, fs->fs_mntops);
290 for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
291 if ((cp = index(opt, '=')))
292 *cp++ = '\0';
293 if (strcmp(opt, usrname) == 0)
294 break;
295 }
296 if (!opt)
297 return (0);
298 if (cp) {
299 *qfnamep = cp;
300 return (1);
301 }
302 sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
303 *qfnamep = buf;
304 return (1);
305 }
306