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
   7 #ifndef lint
   8 static const char rcsid[] =
   9   "$FreeBSD: src/libexec/rpc.rquotad/rquotad.c,v 1.3.2.1 2001/07/02 23:46:27 mikeh Exp $";
  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 #include <varargs.h>
  32
  33 #include <ufs/ufs/quota.h>
  34 #include <rpc/rpc.h>
  35 #include <rpc/pmap_clnt.h>
  36 #include <rpcsvc/rquota.h>
  37 #include <arpa/inet.h>
  38
  39 void rquota_service __P((struct svc_req *request, SVCXPRT *transp));
  40 void sendquota __P((struct svc_req *request, SVCXPRT *transp));
  41 void printerr_reply __P((SVCXPRT *transp));
  42 void initfs __P((void));
  43 int getfsquota __P((long id, char *path, struct dqblk *dqblk));
  44 int hasquota __P((struct fstab *fs, char **qfnamep));
  45
  46 /*
  47  * structure containing informations about ufs filesystems
  48  * initialised by initfs()
  49  */
  50 struct fs_stat {
  51         struct fs_stat *fs_next;        /* next element */
  52         char   *fs_file;                /* mount point of the filesystem */
  53         char   *qfpathname;             /* pathname of the quota file */
  54         dev_t   st_dev;                 /* device of the filesystem */
  55 } fs_stat;
  56 struct fs_stat *fs_begin = NULL;
  57
  58 int from_inetd = 1;
  59
  60 void
  61 cleanup()
  62 {
  63         (void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
  64         exit(0);
  65 }
  66
  67 int
  68 main(argc, argv)
  69         int     argc;
  70         char   *argv[];
  71 {
  72         SVCXPRT *transp;
  73         int sock = 0;
  74         int proto = 0;
  75         struct sockaddr_in from;
  76         int fromlen;
  77
  78         fromlen = sizeof(from);
  79         if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
  80                 from_inetd = 0;
  81                 sock = RPC_ANYSOCK;
  82                 proto = IPPROTO_UDP;
  83         }
  84
  85         if (!from_inetd) {
  86                 daemon(0, 0);
  87
  88                 (void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
  89
  90                 (void) signal(SIGINT, cleanup);
  91                 (void) signal(SIGTERM, cleanup);
  92                 (void) signal(SIGHUP, cleanup);
  93         }
  94
  95         openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
  96
  97         /* create and register the service */
  98         transp = svcudp_create(sock);
  99         if (transp == NULL) {
 100                 syslog(LOG_ERR, "couldn't create udp service");
 101                 exit(1);
 102         }
 103         if (!svc_register(transp, RQUOTAPROG, RQUOTAVERS, rquota_service, proto)) {
 104                 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", proto?"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
 114 void
 115 rquota_service(request, transp)
 116         struct svc_req *request;
 117         SVCXPRT *transp;
 118 {
 119         switch (request->rq_proc) {
 120         case NULLPROC:
 121                 (void)svc_sendreply(transp, xdr_void, (char *)NULL);
 122                 break;
 123
 124         case RQUOTAPROC_GETQUOTA:
 125         case RQUOTAPROC_GETACTIVEQUOTA:
 126                 sendquota(request, transp);
 127                 break;
 128
 129         default:
 130                 svcerr_noproc(transp);
 131                 break;
 132         }
 133         if (from_inetd)
 134                 exit(0);
 135 }
 136
 137 /* read quota for the specified id, and send it */
 138 void
 139 sendquota(request, transp)
 140         struct svc_req *request;
 141         SVCXPRT *transp;
 142 {
 143         struct getquota_args getq_args;
 144         struct getquota_rslt getq_rslt;
 145         struct dqblk dqblk;
 146         struct timeval timev;
 147
 148         bzero((char *)&getq_args, sizeof(getq_args));
 149         if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
 150                 svcerr_decode(transp);
 151                 return;
 152         }
 153         if (request->rq_cred.oa_flavor != AUTH_UNIX) {
 154                 /* bad auth */
 155                 getq_rslt.status = Q_EPERM;
 156         } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
 157                 /* failed, return noquota */
 158                 getq_rslt.status = Q_NOQUOTA;
 159         } else {
 160                 gettimeofday(&timev, NULL);
 161                 getq_rslt.status = Q_OK;
 162                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
 163                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
 164                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
 165                     dqblk.dqb_bhardlimit;
 166                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
 167                     dqblk.dqb_bsoftlimit;
 168                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
 169                     dqblk.dqb_curblocks;
 170                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
 171                     dqblk.dqb_ihardlimit;
 172                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
 173                     dqblk.dqb_isoftlimit;
 174                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
 175                     dqblk.dqb_curinodes;
 176                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
 177                     dqblk.dqb_btime - timev.tv_sec;
 178                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
 179                     dqblk.dqb_itime - timev.tv_sec;
 180         }
 181         if (!svc_sendreply(transp, xdr_getquota_rslt, (char *)&getq_rslt)) {
 182                 svcerr_systemerr(transp);
 183         }
 184         if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
 185                 syslog(LOG_ERR, "unable to free arguments");
 186                 exit(1);
 187         }
 188 }
 189
 190 void
 191 printerr_reply(transp)  /* when a reply to a request failed */
 192         SVCXPRT *transp;
 193 {
 194         char   *name;
 195         struct sockaddr_in *caller;
 196         int     save_errno;
 197
 198         save_errno = errno;
 199
 200         caller = svc_getcaller(transp);
 201         name = (char *)inet_ntoa(caller->sin_addr);
 202         errno = save_errno;
 203         if (errno == 0)
 204                 syslog(LOG_ERR, "couldn't send reply to %s", name);
 205         else
 206                 syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
 207 }
 208
 209 /* initialise the fs_tab list from entries in /etc/fstab */
 210 void
 211 initfs()
 212 {
 213         struct fs_stat *fs_current = NULL;
 214         struct fs_stat *fs_next = NULL;
 215         char *qfpathname;
 216         struct fstab *fs;
 217         struct stat st;
 218
 219         setfsent();
 220         while ((fs = getfsent())) {
 221                 if (strcmp(fs->fs_vfstype, "ufs"))
 222                         continue;
 223                 if (!hasquota(fs, &qfpathname))
 224                         continue;
 225
 226                 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
 227                 fs_current->fs_next = fs_next;  /* next element */
 228
 229                 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
 230                 strcpy(fs_current->fs_file, fs->fs_file);
 231
 232                 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
 233                 strcpy(fs_current->qfpathname, qfpathname);
 234
 235                 stat(fs_current->fs_file, &st);
 236                 fs_current->st_dev = st.st_dev;
 237
 238                 fs_next = fs_current;
 239         }
 240         endfsent();
 241         fs_begin = fs_current;
 242 }
 243
 244 /*
 245  * gets the quotas for id, filesystem path.
 246  * Return 0 if fail, 1 otherwise
 247  */
 248 int
 249 getfsquota(id, path, dqblk)
 250         long id;
 251         char   *path;
 252         struct dqblk *dqblk;
 253 {
 254         struct stat st_path;
 255         struct fs_stat *fs;
 256         int     qcmd, fd, ret = 0;
 257
 258         if (stat(path, &st_path) < 0)
 259                 return (0);
 260
 261         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
 262
 263         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
 264                 /* where the devise is the same as path */
 265                 if (fs->st_dev != st_path.st_dev)
 266                         continue;
 267
 268                 /* find the specified filesystem. get and return quota */
 269                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
 270                         return (1);
 271
 272                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
 273                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
 274                         return (0);
 275                 }
 276                 if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) {
 277                         close(fd);
 278                         return (1);
 279                 }
 280                 switch (read(fd, dqblk, sizeof(struct dqblk))) {
 281                 case 0:
 282                         /*
 283                          * Convert implicit 0 quota (EOF)
 284                          * into an explicit one (zero'ed dqblk)
 285                          */
 286                         bzero((caddr_t) dqblk, sizeof(struct dqblk));
 287                         ret = 1;
 288                         break;
 289                 case sizeof(struct dqblk):      /* OK */
 290                         ret = 1;
 291                         break;
 292                 default:        /* ERROR */
 293                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
 294                         close(fd);
 295                         return (0);
 296                 }
 297                 close(fd);
 298         }
 299         return (ret);
 300 }
 301
 302 /*
 303  * Check to see if a particular quota is to be enabled.
 304  * Comes from quota.c, NetBSD 0.9
 305  */
 306 int
 307 hasquota(fs, qfnamep)
 308         struct fstab *fs;
 309         char  **qfnamep;
 310 {
 311         static char initname, usrname[100];
 312         static char buf[BUFSIZ];
 313         char    *opt, *cp;
 314         char    *qfextension[] = INITQFNAMES;
 315
 316         if (!initname) {
 317                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
 318                 initname = 1;
 319         }
 320         strcpy(buf, fs->fs_mntops);
 321         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
 322                 if ((cp = index(opt, '=')))
 323                         *cp++ = '\0';
 324                 if (strcmp(opt, usrname) == 0)
 325                         break;
 326         }
 327         if (!opt)
 328                 return (0);
 329         if (cp) {
 330                 *qfnamep = cp;
 331                 return (1);
 332         }
 333         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
 334         *qfnamep = buf;
 335         return (1);
 336 }