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  */
   8
   9 #include <sys/param.h>
  10 #include <sys/types.h>
  11 #include <sys/mount.h>
  12 #include <sys/stat.h>
  13 #include <sys/socket.h>
  14 #include <signal.h>
  15
  16 #include <ctype.h>
  17 #include <errno.h>
  18 #include <fcntl.h>
  19 #include <fstab.h>
  20 #include <grp.h>
  21 #include <pwd.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26
  27 #include <syslog.h>
  28
  29 #include <vfs/ufs/quota.h>
  30 #include <rpc/rpc.h>
  31 #include <rpcsvc/rquota.h>
  32 #include <arpa/inet.h>
  33 #include <netdb.h>
  34
  35 static void cleanup(int);
  36 static void rquota_service(struct svc_req *request, SVCXPRT *transp);
  37 static void sendquota(struct svc_req *request, SVCXPRT *transp);
  38 static void initfs(void);
  39 static int getfsquota(long id, char *path, struct ufs_dqblk *dqblk);
  40 static int hasquota(struct fstab *fs, char **qfnamep);
  41
  42 /*
  43  * structure containing informations about ufs filesystems
  44  * initialised by initfs()
  45  */
  46 struct fs_stat {
  47         struct fs_stat *fs_next;        /* next element */
  48         char   *fs_file;                /* mount point of the filesystem */
  49         char   *qfpathname;             /* pathname of the quota file */
  50         dev_t   st_dev;                 /* device of the filesystem */
  51 } fs_stat;
  52 struct fs_stat *fs_begin = NULL;
  53
  54 int from_inetd = 1;
  55
  56 void
  57 cleanup(int signo __unused)
  58 {
  59         (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
  60         exit(0);
  61 }
  62
  63 int
  64 main(void)
  65 {
  66         SVCXPRT *transp;
  67         int ok;
  68         struct sockaddr_storage from;
  69         int fromlen;
  70
  71         fromlen = sizeof(from);
  72         if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
  73                 from_inetd = 0;
  74         }
  75
  76         if (!from_inetd) {
  77                 daemon(0, 0);
  78
  79                 (void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
  80
  81                 (void) signal(SIGINT, cleanup);
  82                 (void) signal(SIGTERM, cleanup);
  83                 (void) signal(SIGHUP, cleanup);
  84         }
  85
  86         openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
  87
  88         /* create and register the service */
  89         if (from_inetd) {
  90                 transp = svc_tli_create(0, NULL, NULL, 0, 0);
  91                 if (transp == NULL) {
  92                         syslog(LOG_ERR, "couldn't create udp service.");
  93                         exit(1);
  94                 }
  95                 ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
  96                              rquota_service, NULL);
  97         } else
  98                 ok = svc_create(rquota_service,
  99                                 RQUOTAPROG, RQUOTAVERS, "udp");
 100         if (!ok) {
 101                 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", (!from_inetd)?"udp":"(inetd)");
 102                 exit(1);
 103         }
 104
 105         initfs();               /* init the fs_stat list */
 106         svc_run();
 107         syslog(LOG_ERR, "svc_run returned");
 108         exit(1);
 109 }
 110
 111 void
 112 rquota_service(struct svc_req *request, SVCXPRT *transp)
 113 {
 114         switch (request->rq_proc) {
 115         case NULLPROC:
 116                 (void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
 117                 break;
 118
 119         case RQUOTAPROC_GETQUOTA:
 120         case RQUOTAPROC_GETACTIVEQUOTA:
 121                 sendquota(request, transp);
 122                 break;
 123
 124         default:
 125                 svcerr_noproc(transp);
 126                 break;
 127         }
 128         if (from_inetd)
 129                 exit(0);
 130 }
 131
 132 /* read quota for the specified id, and send it */
 133 void
 134 sendquota(struct svc_req *request, SVCXPRT *transp)
 135 {
 136         struct getquota_args getq_args;
 137         struct getquota_rslt getq_rslt;
 138         struct ufs_dqblk dqblk;
 139         struct timeval timev;
 140
 141         bzero((char *)&getq_args, sizeof(getq_args));
 142         if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) {
 143                 svcerr_decode(transp);
 144                 return;
 145         }
 146         if (request->rq_cred.oa_flavor != AUTH_UNIX) {
 147                 /* bad auth */
 148                 getq_rslt.status = Q_EPERM;
 149         } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
 150                 /* failed, return noquota */
 151                 getq_rslt.status = Q_NOQUOTA;
 152         } else {
 153                 gettimeofday(&timev, NULL);
 154                 getq_rslt.status = Q_OK;
 155                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
 156                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
 157                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
 158                     dqblk.dqb_bhardlimit;
 159                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
 160                     dqblk.dqb_bsoftlimit;
 161                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
 162                     dqblk.dqb_curblocks;
 163                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
 164                     dqblk.dqb_ihardlimit;
 165                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
 166                     dqblk.dqb_isoftlimit;
 167                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
 168                     dqblk.dqb_curinodes;
 169                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
 170                     dqblk.dqb_btime - timev.tv_sec;
 171                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
 172                     dqblk.dqb_itime - timev.tv_sec;
 173         }
 174         if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, (char *)&getq_rslt)) {
 175                 svcerr_systemerr(transp);
 176         }
 177         if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, (caddr_t)&getq_args)) {
 178                 syslog(LOG_ERR, "unable to free arguments");
 179                 exit(1);
 180         }
 181 }
 182
 183 /* initialise the fs_tab list from entries in /etc/fstab */
 184 void
 185 initfs(void)
 186 {
 187         struct fs_stat *fs_current = NULL;
 188         struct fs_stat *fs_next = NULL;
 189         char *qfpathname;
 190         struct fstab *fs;
 191         struct stat st;
 192
 193         setfsent();
 194         while ((fs = getfsent())) {
 195                 if (strcmp(fs->fs_vfstype, "ufs"))
 196                         continue;
 197                 if (!hasquota(fs, &qfpathname))
 198                         continue;
 199
 200                 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
 201                 fs_current->fs_next = fs_next;  /* next element */
 202
 203                 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
 204                 strcpy(fs_current->fs_file, fs->fs_file);
 205
 206                 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
 207                 strcpy(fs_current->qfpathname, qfpathname);
 208
 209                 stat(fs_current->fs_file, &st);
 210                 fs_current->st_dev = st.st_dev;
 211
 212                 fs_next = fs_current;
 213         }
 214         endfsent();
 215         fs_begin = fs_current;
 216 }
 217
 218 /*
 219  * gets the quotas for id, filesystem path.
 220  * Return 0 if fail, 1 otherwise
 221  */
 222 int
 223 getfsquota(long id, char *path, struct ufs_dqblk *dqblk)
 224 {
 225         struct stat st_path;
 226         struct fs_stat *fs;
 227         int     qcmd, fd, ret = 0;
 228
 229         if (stat(path, &st_path) < 0)
 230                 return (0);
 231
 232         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
 233
 234         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
 235                 /* where the devise is the same as path */
 236                 if (fs->st_dev != st_path.st_dev)
 237                         continue;
 238
 239                 /* find the specified filesystem. get and return quota */
 240                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
 241                         return (1);
 242
 243                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
 244                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
 245                         return (0);
 246                 }
 247                 if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) {
 248                         close(fd);
 249                         return (1);
 250                 }
 251                 switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) {
 252                 case 0:
 253                         /*
 254                          * Convert implicit 0 quota (EOF)
 255                          * into an explicit one (zero'ed dqblk)
 256                          */
 257                         bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk));
 258                         ret = 1;
 259                         break;
 260                 case sizeof(struct ufs_dqblk):  /* OK */
 261                         ret = 1;
 262                         break;
 263                 default:        /* ERROR */
 264                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
 265                         close(fd);
 266                         return (0);
 267                 }
 268                 close(fd);
 269         }
 270         return (ret);
 271 }
 272
 273 /*
 274  * Check to see if a particular quota is to be enabled.
 275  * Comes from quota.c, NetBSD 0.9
 276  */
 277 int
 278 hasquota(struct fstab *fs, char **qfnamep)
 279 {
 280         static char initname, usrname[100];
 281         static char buf[BUFSIZ];
 282         char    *opt, *cp;
 283         const char *qfextension[] = INITQFNAMES;
 284
 285         if (!initname) {
 286                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
 287                 initname = 1;
 288         }
 289         strcpy(buf, fs->fs_mntops);
 290         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
 291                 if ((cp = index(opt, '=')))
 292                         *cp++ = '\0';
 293                 if (strcmp(opt, usrname) == 0)
 294                         break;
 295         }
 296         if (!opt)
 297                 return (0);
 298         if (cp) {
 299                 *qfnamep = cp;
 300                 return (1);
 301         }
 302         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
 303         *qfnamep = buf;
 304         return (1);
 305 }