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 #include <sys/cdefs.h>
   8 __FBSDID("$FreeBSD$");
   9
  10 #include <sys/param.h>
  11 #include <sys/mount.h>
  12 #include <sys/file.h>
  13 #include <sys/stat.h>
  14 #include <sys/socket.h>
  15
  16 #include <ufs/ufs/quota.h>
  17 #include <rpc/rpc.h>
  18 #include <rpcsvc/rquota.h>
  19 #include <arpa/inet.h>
  20 #include <netdb.h>
  21
  22 #include <ctype.h>
  23 #include <errno.h>
  24 #include <fstab.h>
  25 #include <grp.h>
  26 #include <pwd.h>
  27 #include <signal.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <syslog.h>
  32 #include <unistd.h>
  33
  34 void rquota_service(struct svc_req *request, SVCXPRT *transp);
  35 void sendquota(struct svc_req *request, SVCXPRT *transp);
  36 void printerr_reply(SVCXPRT *transp);
  37 void initfs(void);
  38 int getfsquota(long id, char *path, struct dqblk *dqblk);
  39 int hasquota(struct fstab *fs, char **qfnamep);
  40
  41 /*
  42  * structure containing informations about ufs filesystems
  43  * initialised by initfs()
  44  */
  45 struct fs_stat {
  46         struct fs_stat *fs_next;        /* next element */
  47         char   *fs_file;                /* mount point of the filesystem */
  48         char   *qfpathname;             /* pathname of the quota file */
  49         dev_t   st_dev;                 /* device of the filesystem */
  50 } fs_stat;
  51 struct fs_stat *fs_begin = NULL;
  52
  53 int from_inetd = 1;
  54
  55 static void
  56 cleanup(int sig)
  57 {
  58
  59         (void) sig;
  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         socklen_t 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,
 103                     "unable to register (RQUOTAPROG, RQUOTAVERS, %s)",
 104                     from_inetd ? "(inetd)" : "udp");
 105                 exit(1);
 106         }
 107
 108         initfs();
 109         svc_run();
 110         syslog(LOG_ERR, "svc_run returned");
 111         exit(1);
 112 }
 113
 114 void
 115 rquota_service(struct svc_req *request, SVCXPRT *transp)
 116 {
 117
 118         switch (request->rq_proc) {
 119         case NULLPROC:
 120                 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL);
 121                 break;
 122
 123         case RQUOTAPROC_GETQUOTA:
 124         case RQUOTAPROC_GETACTIVEQUOTA:
 125                 sendquota(request, transp);
 126                 break;
 127
 128         default:
 129                 svcerr_noproc(transp);
 130                 break;
 131         }
 132         if (from_inetd)
 133                 exit(0);
 134 }
 135
 136 /* read quota for the specified id, and send it */
 137 void
 138 sendquota(struct svc_req *request, SVCXPRT *transp)
 139 {
 140         struct getquota_args getq_args;
 141         struct getquota_rslt getq_rslt;
 142         struct dqblk dqblk;
 143         struct timeval timev;
 144
 145         bzero((char *)&getq_args, sizeof(getq_args));
 146         if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
 147                 svcerr_decode(transp);
 148                 return;
 149         }
 150         if (request->rq_cred.oa_flavor != AUTH_UNIX) {
 151                 /* bad auth */
 152                 getq_rslt.status = Q_EPERM;
 153         } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
 154                 /* failed, return noquota */
 155                 getq_rslt.status = Q_NOQUOTA;
 156         } else {
 157                 gettimeofday(&timev, NULL);
 158                 getq_rslt.status = Q_OK;
 159                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
 160                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
 161                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
 162                     dqblk.dqb_bhardlimit;
 163                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
 164                     dqblk.dqb_bsoftlimit;
 165                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
 166                     dqblk.dqb_curblocks;
 167                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
 168                     dqblk.dqb_ihardlimit;
 169                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
 170                     dqblk.dqb_isoftlimit;
 171                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
 172                     dqblk.dqb_curinodes;
 173                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
 174                     dqblk.dqb_btime - timev.tv_sec;
 175                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
 176                     dqblk.dqb_itime - timev.tv_sec;
 177         }
 178         if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt)) {
 179                 svcerr_systemerr(transp);
 180         }
 181         if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
 182                 syslog(LOG_ERR, "unable to free arguments");
 183                 exit(1);
 184         }
 185 }
 186
 187 void
 188 printerr_reply(SVCXPRT *transp) /* when a reply to a request failed */
 189 {
 190         char name[INET6_ADDRSTRLEN];
 191         struct sockaddr *caller;
 192         int     save_errno;
 193
 194         save_errno = errno;
 195
 196         caller = (struct sockaddr *)svc_getrpccaller(transp)->buf;
 197         getnameinfo(caller, caller->sa_len, name, sizeof (name),
 198                     NULL, 0, NI_NUMERICHOST);
 199         errno = save_errno;
 200         if (errno == 0)
 201                 syslog(LOG_ERR, "couldn't send reply to %s", name);
 202         else
 203                 syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
 204 }
 205
 206 /* initialise the fs_tab list from entries in /etc/fstab */
 207 void
 208 initfs(void)
 209 {
 210         struct fs_stat *fs_current = NULL;
 211         struct fs_stat *fs_next = NULL;
 212         char *qfpathname;
 213         struct fstab *fs;
 214         struct stat st;
 215
 216         setfsent();
 217         while ((fs = getfsent())) {
 218                 if (strcmp(fs->fs_vfstype, "ufs"))
 219                         continue;
 220                 if (!hasquota(fs, &qfpathname))
 221                         continue;
 222
 223                 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
 224                 fs_current->fs_next = fs_next;  /* next element */
 225
 226                 fs_current->fs_file =
 227                     malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
 228                 strcpy(fs_current->fs_file, fs->fs_file);
 229
 230                 fs_current->qfpathname =
 231                     malloc(sizeof(char) * (strlen(qfpathname) + 1));
 232                 strcpy(fs_current->qfpathname, qfpathname);
 233
 234                 stat(fs_current->fs_file, &st);
 235                 fs_current->st_dev = st.st_dev;
 236
 237                 fs_next = fs_current;
 238         }
 239         endfsent();
 240         fs_begin = fs_current;
 241 }
 242
 243 /*
 244  * gets the quotas for id, filesystem path.
 245  * Return 0 if fail, 1 otherwise
 246  */
 247 int
 248 getfsquota(long id, char *path, struct dqblk *dqblk)
 249 {
 250         struct stat st_path;
 251         struct fs_stat *fs;
 252         int     qcmd, fd, ret = 0;
 253
 254         if (stat(path, &st_path) < 0)
 255                 return (0);
 256
 257         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
 258
 259         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
 260                 /* where the devise is the same as path */
 261                 if (fs->st_dev != st_path.st_dev)
 262                         continue;
 263
 264                 /* find the specified filesystem. get and return quota */
 265                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
 266                         return (1);
 267
 268                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
 269                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
 270                         return (0);
 271                 }
 272                 if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) {
 273                         close(fd);
 274                         return (1);
 275                 }
 276                 switch (read(fd, dqblk, sizeof(struct dqblk))) {
 277                 case 0:
 278                         /*
 279                          * Convert implicit 0 quota (EOF)
 280                          * into an explicit one (zero'ed dqblk)
 281                          */
 282                         bzero(dqblk, sizeof(struct dqblk));
 283                         ret = 1;
 284                         break;
 285                 case sizeof(struct dqblk):      /* OK */
 286                         ret = 1;
 287                         break;
 288                 default:        /* ERROR */
 289                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
 290                         close(fd);
 291                         return (0);
 292                 }
 293                 close(fd);
 294         }
 295         return (ret);
 296 }
 297
 298 /*
 299  * Check to see if a particular quota is to be enabled.
 300  * Comes from quota.c, NetBSD 0.9
 301  */
 302 int
 303 hasquota(struct fstab *fs, char  **qfnamep)
 304 {
 305         static char initname, usrname[100];
 306         static char buf[BUFSIZ];
 307         char *opt, *cp;
 308         const char *qfextension[] = INITQFNAMES;
 309
 310         if (!initname) {
 311                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
 312                 initname = 1;
 313         }
 314         strcpy(buf, fs->fs_mntops);
 315         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
 316                 if ((cp = index(opt, '=')))
 317                         *cp++ = '\0';
 318                 if (strcmp(opt, usrname) == 0)
 319                         break;
 320         }
 321         if (!opt)
 322                 return (0);
 323         if (cp) {
 324                 *qfnamep = cp;
 325                 return (1);
 326         }
 327         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME,
 328             qfextension[USRQUOTA]);
 329         *qfnamep = buf;
 330         return (1);
 331 }