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 #include <varargs.h>
  32
  33 #include <ufs/ufs/quota.h>
  34 #include <rpc/rpc.h>
  35 #include <rpcsvc/rquota.h>
  36 #include <arpa/inet.h>
  37 #include <netdb.h>
  38
  39 void rquota_service(struct svc_req *request, SVCXPRT *transp);
  40 void sendquota(struct svc_req *request, SVCXPRT *transp);
  41 void printerr_reply(SVCXPRT *transp);
  42 void initfs(void);
  43 int getfsquota(long id, char *path, struct dqblk *dqblk);
  44 int hasquota(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(int sig)
  62 {
  63         (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
  64         exit(0);
  65 }
  66
  67 int
  68 main(int argc, char *argv[])
  69 {
  70         SVCXPRT *transp;
  71         int ok;
  72         struct sockaddr_storage from;
  73         int fromlen;
  74
  75         fromlen = sizeof(from);
  76         if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
  77                 from_inetd = 0;
  78         }
  79
  80         if (!from_inetd) {
  81                 daemon(0, 0);
  82
  83                 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
  84
  85                 (void) signal(SIGINT, cleanup);
  86                 (void) signal(SIGTERM, cleanup);
  87                 (void) signal(SIGHUP, cleanup);
  88         }
  89
  90         openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
  91
  92         /* create and register the service */
  93         if (from_inetd) {
  94                 transp = svc_tli_create(0, NULL, NULL, 0, 0);
  95                 if (transp == NULL) {
  96                         syslog(LOG_ERR, "couldn't create udp service.");
  97                         exit(1);
  98                 }
  99                 ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
 100                              rquota_service, NULL);
 101         } else
 102                 ok = svc_create(rquota_service,
 103                                 RQUOTAPROG, RQUOTAVERS, "udp");
 104         if (!ok) {
 105                 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"udp":"(inetd)");
 106                 exit(1);
 107         }
 108
 109         initfs();               /* init the fs_stat list */
 110         svc_run();
 111         syslog(LOG_ERR, "svc_run returned");
 112         exit(1);
 113 }
 114
 115 void
 116 rquota_service(struct svc_req *request, SVCXPRT *transp)
 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 = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
 227                 strcpy(fs_current->fs_file, fs->fs_file);
 228
 229                 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
 230                 strcpy(fs_current->qfpathname, qfpathname);
 231
 232                 stat(fs_current->fs_file, &st);
 233                 fs_current->st_dev = st.st_dev;
 234
 235                 fs_next = fs_current;
 236         }
 237         endfsent();
 238         fs_begin = fs_current;
 239 }
 240
 241 /*
 242  * gets the quotas for id, filesystem path.
 243  * Return 0 if fail, 1 otherwise
 244  */
 245 int
 246 getfsquota(long id, char   *path, struct dqblk *dqblk)
 247 {
 248         struct stat st_path;
 249         struct fs_stat *fs;
 250         int     qcmd, fd, ret = 0;
 251
 252         if (stat(path, &st_path) < 0)
 253                 return (0);
 254
 255         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
 256
 257         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
 258                 /* where the devise is the same as path */
 259                 if (fs->st_dev != st_path.st_dev)
 260                         continue;
 261
 262                 /* find the specified filesystem. get and return quota */
 263                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
 264                         return (1);
 265
 266                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
 267                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
 268                         return (0);
 269                 }
 270                 if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) {
 271                         close(fd);
 272                         return (1);
 273                 }
 274                 switch (read(fd, dqblk, sizeof(struct dqblk))) {
 275                 case 0:
 276                         /*
 277                          * Convert implicit 0 quota (EOF)
 278                          * into an explicit one (zero'ed dqblk)
 279                          */
 280                         bzero(dqblk, sizeof(struct dqblk));
 281                         ret = 1;
 282                         break;
 283                 case sizeof(struct dqblk):      /* OK */
 284                         ret = 1;
 285                         break;
 286                 default:        /* ERROR */
 287                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
 288                         close(fd);
 289                         return (0);
 290                 }
 291                 close(fd);
 292         }
 293         return (ret);
 294 }
 295
 296 /*
 297  * Check to see if a particular quota is to be enabled.
 298  * Comes from quota.c, NetBSD 0.9
 299  */
 300 int
 301 hasquota(struct fstab *fs, char  **qfnamep)
 302 {
 303         static char initname, usrname[100];
 304         static char buf[BUFSIZ];
 305         char    *opt, *cp;
 306         char    *qfextension[] = INITQFNAMES;
 307
 308         if (!initname) {
 309                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
 310                 initname = 1;
 311         }
 312         strcpy(buf, fs->fs_mntops);
 313         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
 314                 if ((cp = index(opt, '=')))
 315                         *cp++ = '\0';
 316                 if (strcmp(opt, usrname) == 0)
 317                         break;
 318         }
 319         if (!opt)
 320                 return (0);
 321         if (cp) {
 322                 *qfnamep = cp;
 323                 return (1);
 324         }
 325         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
 326         *qfnamep = buf;
 327         return (1);
 328 }