a450a66e78128234ecdc126325ac9250147d126e
[dragonfly.git] / libexec / rpc.rquotad / rquotad.c
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 #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 static void cleanup(int);
38 static void rquota_service(struct svc_req *request, SVCXPRT *transp);
39 static void sendquota(struct svc_req *request, SVCXPRT *transp);
40 static void initfs(void);
41 static int getfsquota(long id, char *path, struct ufs_dqblk *dqblk);
42 static 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(int signo __unused)
60 {
61         (void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
62         exit(0);
63 }
64
65 int
66 main(void)
67 {
68         SVCXPRT *transp;
69         int sock = 0;
70         int proto = 0;
71         struct sockaddr_in from;
72         int fromlen;
73
74         fromlen = sizeof(from);
75         if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
76                 from_inetd = 0;
77                 sock = RPC_ANYSOCK;
78                 proto = IPPROTO_UDP;
79         }
80
81         if (!from_inetd) {
82                 daemon(0, 0);
83
84                 (void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
85
86                 (void) signal(SIGINT, cleanup);
87                 (void) signal(SIGTERM, cleanup);
88                 (void) signal(SIGHUP, cleanup);
89         }
90
91         openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
92
93         /* create and register the service */
94         transp = svcudp_create(sock);
95         if (transp == NULL) {
96                 syslog(LOG_ERR, "couldn't create udp service");
97                 exit(1);
98         }
99         if (!svc_register(transp, RQUOTAPROG, RQUOTAVERS, rquota_service, proto)) {
100                 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", proto?"udp":"(inetd)");
101                 exit(1);
102         }
103
104         initfs();               /* init the fs_stat list */
105         svc_run();
106         syslog(LOG_ERR, "svc_run returned");
107         exit(1);
108 }
109
110 void 
111 rquota_service(struct svc_req *request, SVCXPRT *transp)
112 {
113         switch (request->rq_proc) {
114         case NULLPROC:
115                 (void)svc_sendreply(transp, xdr_void, (char *)NULL);
116                 break;
117
118         case RQUOTAPROC_GETQUOTA:
119         case RQUOTAPROC_GETACTIVEQUOTA:
120                 sendquota(request, transp);
121                 break;
122
123         default:
124                 svcerr_noproc(transp);
125                 break;
126         }
127         if (from_inetd)
128                 exit(0);
129 }
130
131 /* read quota for the specified id, and send it */
132 void 
133 sendquota(struct svc_req *request, SVCXPRT *transp)
134 {
135         struct getquota_args getq_args;
136         struct getquota_rslt getq_rslt;
137         struct ufs_dqblk dqblk;
138         struct timeval timev;
139
140         bzero((char *)&getq_args, sizeof(getq_args));
141         if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
142                 svcerr_decode(transp);
143                 return;
144         }
145         if (request->rq_cred.oa_flavor != AUTH_UNIX) {
146                 /* bad auth */
147                 getq_rslt.status = Q_EPERM;
148         } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
149                 /* failed, return noquota */
150                 getq_rslt.status = Q_NOQUOTA;
151         } else {
152                 gettimeofday(&timev, NULL);
153                 getq_rslt.status = Q_OK;
154                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
155                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
156                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
157                     dqblk.dqb_bhardlimit;
158                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
159                     dqblk.dqb_bsoftlimit;
160                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
161                     dqblk.dqb_curblocks;
162                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
163                     dqblk.dqb_ihardlimit;
164                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
165                     dqblk.dqb_isoftlimit;
166                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
167                     dqblk.dqb_curinodes;
168                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
169                     dqblk.dqb_btime - timev.tv_sec;
170                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
171                     dqblk.dqb_itime - timev.tv_sec;
172         }
173         if (!svc_sendreply(transp, xdr_getquota_rslt, (char *)&getq_rslt)) {
174                 svcerr_systemerr(transp);
175         }
176         if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
177                 syslog(LOG_ERR, "unable to free arguments");
178                 exit(1);
179         }
180 }
181
182 /* initialise the fs_tab list from entries in /etc/fstab */
183 void 
184 initfs(void)
185 {
186         struct fs_stat *fs_current = NULL;
187         struct fs_stat *fs_next = NULL;
188         char *qfpathname;
189         struct fstab *fs;
190         struct stat st;
191
192         setfsent();
193         while ((fs = getfsent())) {
194                 if (strcmp(fs->fs_vfstype, "ufs"))
195                         continue;
196                 if (!hasquota(fs, &qfpathname))
197                         continue;
198
199                 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
200                 fs_current->fs_next = fs_next;  /* next element */
201
202                 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
203                 strcpy(fs_current->fs_file, fs->fs_file);
204
205                 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
206                 strcpy(fs_current->qfpathname, qfpathname);
207
208                 stat(fs_current->fs_file, &st);
209                 fs_current->st_dev = st.st_dev;
210
211                 fs_next = fs_current;
212         }
213         endfsent();
214         fs_begin = fs_current;
215 }
216
217 /*
218  * gets the quotas for id, filesystem path.
219  * Return 0 if fail, 1 otherwise
220  */
221 int
222 getfsquota(long id, char *path, struct ufs_dqblk *dqblk)
223 {
224         struct stat st_path;
225         struct fs_stat *fs;
226         int     qcmd, fd, ret = 0;
227
228         if (stat(path, &st_path) < 0)
229                 return (0);
230
231         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
232
233         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
234                 /* where the devise is the same as path */
235                 if (fs->st_dev != st_path.st_dev)
236                         continue;
237
238                 /* find the specified filesystem. get and return quota */
239                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
240                         return (1);
241
242                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
243                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
244                         return (0);
245                 }
246                 if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) {
247                         close(fd);
248                         return (1);
249                 }
250                 switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) {
251                 case 0:
252                         /*
253                          * Convert implicit 0 quota (EOF)
254                          * into an explicit one (zero'ed dqblk)
255                          */
256                         bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk));
257                         ret = 1;
258                         break;
259                 case sizeof(struct ufs_dqblk):  /* OK */
260                         ret = 1;
261                         break;
262                 default:        /* ERROR */
263                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
264                         close(fd);
265                         return (0);
266                 }
267                 close(fd);
268         }
269         return (ret);
270 }
271
272 /*
273  * Check to see if a particular quota is to be enabled.
274  * Comes from quota.c, NetBSD 0.9
275  */
276 int
277 hasquota(struct fstab *fs, char **qfnamep)
278 {
279         static char initname, usrname[100];
280         static char buf[BUFSIZ];
281         char    *opt, *cp;
282         const char *qfextension[] = INITQFNAMES;
283
284         if (!initname) {
285                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
286                 initname = 1;
287         }
288         strcpy(buf, fs->fs_mntops);
289         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
290                 if ((cp = index(opt, '=')))
291                         *cp++ = '\0';
292                 if (strcmp(opt, usrname) == 0)
293                         break;
294         }
295         if (!opt)
296                 return (0);
297         if (cp) {
298                 *qfnamep = cp;
299                 return (1);
300         }
301         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
302         *qfnamep = buf;
303         return (1);
304 }