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   "$FreeBSD$";
  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
  32 #include <ufs/ufs/quota.h>
  33 #include <rpc/rpc.h>
  34 #include <rpcsvc/rquota.h>
  35 #include <arpa/inet.h>
  36 #include <netdb.h>
  37
  38 void rquota_service(struct svc_req *request, SVCXPRT *transp);
  39 void sendquota(struct svc_req *request, SVCXPRT *transp);
  40 void printerr_reply(SVCXPRT *transp);
  41 void initfs(void);
  42 int getfsquota(long id, char *path, struct dqblk *dqblk);
  43 int hasquota(struct fstab *fs, char **qfnamep);
  44
  45 /*
  46  * structure containing informations about ufs filesystems
  47  * initialised by initfs()
  48  */
  49 struct fs_stat {
  50         struct fs_stat *fs_next;        /* next element */
  51         char   *fs_file;                /* mount point of the filesystem */
  52         char   *qfpathname;             /* pathname of the quota file */
  53         dev_t   st_dev;                 /* device of the filesystem */
  54 } fs_stat;
  55 struct fs_stat *fs_begin = NULL;
  56
  57 int from_inetd = 1;
  58
  59 void
  60 cleanup(int sig)
  61 {
  62         (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
  63         exit(0);
  64 }
  65
  66 int
  67 main(int argc, char *argv[])
  68 {
  69         SVCXPRT *transp;
  70         int ok;
  71         struct sockaddr_storage from;
  72         socklen_t fromlen;
  73
  74         fromlen = sizeof(from);
  75         if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
  76                 from_inetd = 0;
  77         }
  78
  79         if (!from_inetd) {
  80                 daemon(0, 0);
  81
  82                 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
  83
  84                 (void) signal(SIGINT, cleanup);
  85                 (void) signal(SIGTERM, cleanup);
  86                 (void) signal(SIGHUP, cleanup);
  87         }
  88
  89         openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
  90
  91         /* create and register the service */
  92         if (from_inetd) {
  93                 transp = svc_tli_create(0, NULL, NULL, 0, 0);
  94                 if (transp == NULL) {
  95                         syslog(LOG_ERR, "couldn't create udp service.");
  96                         exit(1);
  97                 }
  98                 ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
  99                              rquota_service, NULL);
 100         } else
 101                 ok = svc_create(rquota_service,
 102                                 RQUOTAPROG, RQUOTAVERS, "udp");
 103         if (!ok) {
 104                 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"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(struct svc_req *request, SVCXPRT *transp)
 116 {
 117         switch (request->rq_proc) {
 118         case NULLPROC:
 119                 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL);
 120                 break;
 121
 122         case RQUOTAPROC_GETQUOTA:
 123         case RQUOTAPROC_GETACTIVEQUOTA:
 124                 sendquota(request, transp);
 125                 break;
 126
 127         default:
 128                 svcerr_noproc(transp);
 129                 break;
 130         }
 131         if (from_inetd)
 132                 exit(0);
 133 }
 134
 135 /* read quota for the specified id, and send it */
 136 void
 137 sendquota(struct svc_req *request, SVCXPRT *transp)
 138 {
 139         struct getquota_args getq_args;
 140         struct getquota_rslt getq_rslt;
 141         struct dqblk dqblk;
 142         struct timeval timev;
 143
 144         bzero((char *)&getq_args, sizeof(getq_args));
 145         if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
 146                 svcerr_decode(transp);
 147                 return;
 148         }
 149         if (request->rq_cred.oa_flavor != AUTH_UNIX) {
 150                 /* bad auth */
 151                 getq_rslt.status = Q_EPERM;
 152         } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
 153                 /* failed, return noquota */
 154                 getq_rslt.status = Q_NOQUOTA;
 155         } else {
 156                 gettimeofday(&timev, NULL);
 157                 getq_rslt.status = Q_OK;
 158                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
 159                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
 160                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
 161                     dqblk.dqb_bhardlimit;
 162                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
 163                     dqblk.dqb_bsoftlimit;
 164                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
 165                     dqblk.dqb_curblocks;
 166                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
 167                     dqblk.dqb_ihardlimit;
 168                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
 169                     dqblk.dqb_isoftlimit;
 170                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
 171                     dqblk.dqb_curinodes;
 172                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
 173                     dqblk.dqb_btime - timev.tv_sec;
 174                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
 175                     dqblk.dqb_itime - timev.tv_sec;
 176         }
 177         if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt)) {
 178                 svcerr_systemerr(transp);
 179         }
 180         if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
 181                 syslog(LOG_ERR, "unable to free arguments");
 182                 exit(1);
 183         }
 184 }
 185
 186 void
 187 printerr_reply(SVCXPRT *transp) /* when a reply to a request failed */
 188 {
 189         char name[INET6_ADDRSTRLEN];
 190         struct sockaddr *caller;
 191         int     save_errno;
 192
 193         save_errno = errno;
 194
 195         caller = (struct sockaddr *)svc_getrpccaller(transp)->buf;
 196         getnameinfo(caller, caller->sa_len, name, sizeof (name),
 197                     NULL, 0, NI_NUMERICHOST);
 198         errno = save_errno;
 199         if (errno == 0)
 200                 syslog(LOG_ERR, "couldn't send reply to %s", name);
 201         else
 202                 syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
 203 }
 204
 205 /* initialise the fs_tab list from entries in /etc/fstab */
 206 void
 207 initfs(void)
 208 {
 209         struct fs_stat *fs_current = NULL;
 210         struct fs_stat *fs_next = NULL;
 211         char *qfpathname;
 212         struct fstab *fs;
 213         struct stat st;
 214
 215         setfsent();
 216         while ((fs = getfsent())) {
 217                 if (strcmp(fs->fs_vfstype, "ufs"))
 218                         continue;
 219                 if (!hasquota(fs, &qfpathname))
 220                         continue;
 221
 222                 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
 223                 fs_current->fs_next = fs_next;  /* next element */
 224
 225                 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
 226                 strcpy(fs_current->fs_file, fs->fs_file);
 227
 228                 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
 229                 strcpy(fs_current->qfpathname, qfpathname);
 230
 231                 stat(fs_current->fs_file, &st);
 232                 fs_current->st_dev = st.st_dev;
 233
 234                 fs_next = fs_current;
 235         }
 236         endfsent();
 237         fs_begin = fs_current;
 238 }
 239
 240 /*
 241  * gets the quotas for id, filesystem path.
 242  * Return 0 if fail, 1 otherwise
 243  */
 244 int
 245 getfsquota(long id, char   *path, struct dqblk *dqblk)
 246 {
 247         struct stat st_path;
 248         struct fs_stat *fs;
 249         int     qcmd, fd, ret = 0;
 250
 251         if (stat(path, &st_path) < 0)
 252                 return (0);
 253
 254         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
 255
 256         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
 257                 /* where the devise is the same as path */
 258                 if (fs->st_dev != st_path.st_dev)
 259                         continue;
 260
 261                 /* find the specified filesystem. get and return quota */
 262                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
 263                         return (1);
 264
 265                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
 266                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
 267                         return (0);
 268                 }
 269                 if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) {
 270                         close(fd);
 271                         return (1);
 272                 }
 273                 switch (read(fd, dqblk, sizeof(struct dqblk))) {
 274                 case 0:
 275                         /*
 276                          * Convert implicit 0 quota (EOF)
 277                          * into an explicit one (zero'ed dqblk)
 278                          */
 279                         bzero(dqblk, sizeof(struct dqblk));
 280                         ret = 1;
 281                         break;
 282                 case sizeof(struct dqblk):      /* OK */
 283                         ret = 1;
 284                         break;
 285                 default:        /* ERROR */
 286                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
 287                         close(fd);
 288                         return (0);
 289                 }
 290                 close(fd);
 291         }
 292         return (ret);
 293 }
 294
 295 /*
 296  * Check to see if a particular quota is to be enabled.
 297  * Comes from quota.c, NetBSD 0.9
 298  */
 299 int
 300 hasquota(struct fstab *fs, char  **qfnamep)
 301 {
 302         static char initname, usrname[100];
 303         static char buf[BUFSIZ];
 304         char    *opt, *cp;
 305         char    *qfextension[] = INITQFNAMES;
 306
 307         if (!initname) {
 308                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
 309                 initname = 1;
 310         }
 311         strcpy(buf, fs->fs_mntops);
 312         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
 313                 if ((cp = index(opt, '=')))
 314                         *cp++ = '\0';
 315                 if (strcmp(opt, usrname) == 0)
 316                         break;
 317         }
 318         if (!opt)
 319                 return (0);
 320         if (cp) {
 321                 *qfnamep = cp;
 322                 return (1);
 323         }
 324         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
 325         *qfnamep = buf;
 326         return (1);
 327 }