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
  30 #include <vfs/ufs/quota.h>
  31 #include <rpc/rpc.h>
  32 #include <rpcsvc/rquota.h>
  33 #include <arpa/inet.h>
  34 #include <netdb.h>
  35
  36 static void cleanup(int);
  37 static void rquota_service(struct svc_req *request, SVCXPRT *transp);
  38 static void sendquota(struct svc_req *request, SVCXPRT *transp);
  39 static void initfs(void);
  40 static int getfsquota(long id, char *path, struct ufs_dqblk *dqblk);
  41 static int hasquota(struct fstab *fs, char **qfnamep);
  42
  43 /*
  44  * structure containing informations about ufs filesystems
  45  * initialised by initfs()
  46  */
  47 struct fs_stat {
  48         struct fs_stat *fs_next;        /* next element */
  49         char   *fs_file;                /* mount point of the filesystem */
  50         char   *qfpathname;             /* pathname of the quota file */
  51         dev_t   st_dev;                 /* device of the filesystem */
  52 } fs_stat;
  53 struct fs_stat *fs_begin = NULL;
  54
  55 int from_inetd = 1;
  56
  57 void
  58 cleanup(int signo __unused)
  59 {
  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         int 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, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"udp":"(inetd)");
 103                 exit(1);
 104         }
 105
 106         initfs();               /* init the fs_stat list */
 107         svc_run();
 108         syslog(LOG_ERR, "svc_run returned");
 109         exit(1);
 110 }
 111
 112 void
 113 rquota_service(struct svc_req *request, SVCXPRT *transp)
 114 {
 115         switch (request->rq_proc) {
 116         case NULLPROC:
 117                 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
 118                 break;
 119
 120         case RQUOTAPROC_GETQUOTA:
 121         case RQUOTAPROC_GETACTIVEQUOTA:
 122                 sendquota(request, transp);
 123                 break;
 124
 125         default:
 126                 svcerr_noproc(transp);
 127                 break;
 128         }
 129         if (from_inetd)
 130                 exit(0);
 131 }
 132
 133 /* read quota for the specified id, and send it */
 134 void
 135 sendquota(struct svc_req *request, SVCXPRT *transp)
 136 {
 137         struct getquota_args getq_args;
 138         struct getquota_rslt getq_rslt;
 139         struct ufs_dqblk dqblk;
 140         struct timeval timev;
 141
 142         bzero((char *)&getq_args, sizeof(getq_args));
 143         if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) {
 144                 svcerr_decode(transp);
 145                 return;
 146         }
 147         if (request->rq_cred.oa_flavor != AUTH_UNIX) {
 148                 /* bad auth */
 149                 getq_rslt.status = Q_EPERM;
 150         } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
 151                 /* failed, return noquota */
 152                 getq_rslt.status = Q_NOQUOTA;
 153         } else {
 154                 gettimeofday(&timev, NULL);
 155                 getq_rslt.status = Q_OK;
 156                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
 157                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
 158                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
 159                     dqblk.dqb_bhardlimit;
 160                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
 161                     dqblk.dqb_bsoftlimit;
 162                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
 163                     dqblk.dqb_curblocks;
 164                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
 165                     dqblk.dqb_ihardlimit;
 166                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
 167                     dqblk.dqb_isoftlimit;
 168                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
 169                     dqblk.dqb_curinodes;
 170                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
 171                     dqblk.dqb_btime - timev.tv_sec;
 172                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
 173                     dqblk.dqb_itime - timev.tv_sec;
 174         }
 175         if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, (char *)&getq_rslt)) {
 176                 svcerr_systemerr(transp);
 177         }
 178         if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) {
 179                 syslog(LOG_ERR, "unable to free arguments");
 180                 exit(1);
 181         }
 182 }
 183
 184 /* initialise the fs_tab list from entries in /etc/fstab */
 185 void
 186 initfs(void)
 187 {
 188         struct fs_stat *fs_current = NULL;
 189         struct fs_stat *fs_next = NULL;
 190         char *qfpathname;
 191         struct fstab *fs;
 192         struct stat st;
 193
 194         setfsent();
 195         while ((fs = getfsent())) {
 196                 if (strcmp(fs->fs_vfstype, "ufs"))
 197                         continue;
 198                 if (!hasquota(fs, &qfpathname))
 199                         continue;
 200
 201                 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
 202                 fs_current->fs_next = fs_next;  /* next element */
 203
 204                 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
 205                 strcpy(fs_current->fs_file, fs->fs_file);
 206
 207                 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
 208                 strcpy(fs_current->qfpathname, qfpathname);
 209
 210                 stat(fs_current->fs_file, &st);
 211                 fs_current->st_dev = st.st_dev;
 212
 213                 fs_next = fs_current;
 214         }
 215         endfsent();
 216         fs_begin = fs_current;
 217 }
 218
 219 /*
 220  * gets the quotas for id, filesystem path.
 221  * Return 0 if fail, 1 otherwise
 222  */
 223 int
 224 getfsquota(long id, char *path, struct ufs_dqblk *dqblk)
 225 {
 226         struct stat st_path;
 227         struct fs_stat *fs;
 228         int     qcmd, fd, ret = 0;
 229
 230         if (stat(path, &st_path) < 0)
 231                 return (0);
 232
 233         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
 234
 235         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
 236                 /* where the devise is the same as path */
 237                 if (fs->st_dev != st_path.st_dev)
 238                         continue;
 239
 240                 /* find the specified filesystem. get and return quota */
 241                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
 242                         return (1);
 243
 244                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
 245                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
 246                         return (0);
 247                 }
 248                 if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) {
 249                         close(fd);
 250                         return (1);
 251                 }
 252                 switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) {
 253                 case 0:
 254                         /*
 255                          * Convert implicit 0 quota (EOF)
 256                          * into an explicit one (zero'ed dqblk)
 257                          */
 258                         bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk));
 259                         ret = 1;
 260                         break;
 261                 case sizeof(struct ufs_dqblk):  /* OK */
 262                         ret = 1;
 263                         break;
 264                 default:        /* ERROR */
 265                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
 266                         close(fd);
 267                         return (0);
 268                 }
 269                 close(fd);
 270         }
 271         return (ret);
 272 }
 273
 274 /*
 275  * Check to see if a particular quota is to be enabled.
 276  * Comes from quota.c, NetBSD 0.9
 277  */
 278 int
 279 hasquota(struct fstab *fs, char **qfnamep)
 280 {
 281         static char initname, usrname[100];
 282         static char buf[BUFSIZ];
 283         char    *opt, *cp;
 284         const char *qfextension[] = INITQFNAMES;
 285
 286         if (!initname) {
 287                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
 288                 initname = 1;
 289         }
 290         strcpy(buf, fs->fs_mntops);
 291         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
 292                 if ((cp = index(opt, '=')))
 293                         *cp++ = '\0';
 294                 if (strcmp(opt, usrname) == 0)
 295                         break;
 296         }
 297         if (!opt)
 298                 return (0);
 299         if (cp) {
 300                 *qfnamep = cp;
 301                 return (1);
 302         }
 303         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
 304         *qfnamep = buf;
 305         return (1);
 306 }