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 1.5 2006/04/03 01:59:27 dillon 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 #include <varargs.h>
  30
  31 #include <vfs/ufs/quota.h>
  32 #include <rpc/rpc.h>
  33 #include <rpc/pmap_clnt.h>
  34 #include <rpcsvc/rquota.h>
  35 #include <arpa/inet.h>
  36
  37 void rquota_service (struct svc_req *request, SVCXPRT *transp);
  38 void sendquota (struct svc_req *request, SVCXPRT *transp);
  39 void printerr_reply (SVCXPRT *transp);
  40 void initfs (void);
  41 int getfsquota (long id, char *path, struct ufs_dqblk *dqblk);
  42 int hasquota (struct fstab *fs, char **qfnamep);
  43
  44 /*
  45  * structure containing informations about ufs filesystems
  46  * initialised by initfs()
  47  */
  48 struct fs_stat {
  49         struct fs_stat *fs_next;        /* next element */
  50         char   *fs_file;                /* mount point of the filesystem */
  51         char   *qfpathname;             /* pathname of the quota file */
  52         dev_t   st_dev;                 /* device of the filesystem */
  53 } fs_stat;
  54 struct fs_stat *fs_begin = NULL;
  55
  56 int from_inetd = 1;
  57
  58 void
  59 cleanup()
  60 {
  61         (void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
  62         exit(0);
  63 }
  64
  65 int
  66 main(argc, argv)
  67         int     argc;
  68         char   *argv[];
  69 {
  70         SVCXPRT *transp;
  71         int sock = 0;
  72         int proto = 0;
  73         struct sockaddr_in from;
  74         int fromlen;
  75
  76         fromlen = sizeof(from);
  77         if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
  78                 from_inetd = 0;
  79                 sock = RPC_ANYSOCK;
  80                 proto = IPPROTO_UDP;
  81         }
  82
  83         if (!from_inetd) {
  84                 daemon(0, 0);
  85
  86                 (void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
  87
  88                 (void) signal(SIGINT, cleanup);
  89                 (void) signal(SIGTERM, cleanup);
  90                 (void) signal(SIGHUP, cleanup);
  91         }
  92
  93         openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
  94
  95         /* create and register the service */
  96         transp = svcudp_create(sock);
  97         if (transp == NULL) {
  98                 syslog(LOG_ERR, "couldn't create udp service");
  99                 exit(1);
 100         }
 101         if (!svc_register(transp, RQUOTAPROG, RQUOTAVERS, rquota_service, proto)) {
 102                 syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", proto?"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(request, transp)
 114         struct svc_req *request;
 115         SVCXPRT *transp;
 116 {
 117         switch (request->rq_proc) {
 118         case NULLPROC:
 119                 (void)svc_sendreply(transp, 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(request, transp)
 138         struct svc_req *request;
 139         SVCXPRT *transp;
 140 {
 141         struct getquota_args getq_args;
 142         struct getquota_rslt getq_rslt;
 143         struct ufs_dqblk dqblk;
 144         struct timeval timev;
 145
 146         bzero((char *)&getq_args, sizeof(getq_args));
 147         if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
 148                 svcerr_decode(transp);
 149                 return;
 150         }
 151         if (request->rq_cred.oa_flavor != AUTH_UNIX) {
 152                 /* bad auth */
 153                 getq_rslt.status = Q_EPERM;
 154         } else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
 155                 /* failed, return noquota */
 156                 getq_rslt.status = Q_NOQUOTA;
 157         } else {
 158                 gettimeofday(&timev, NULL);
 159                 getq_rslt.status = Q_OK;
 160                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
 161                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
 162                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
 163                     dqblk.dqb_bhardlimit;
 164                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
 165                     dqblk.dqb_bsoftlimit;
 166                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
 167                     dqblk.dqb_curblocks;
 168                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
 169                     dqblk.dqb_ihardlimit;
 170                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
 171                     dqblk.dqb_isoftlimit;
 172                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
 173                     dqblk.dqb_curinodes;
 174                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
 175                     dqblk.dqb_btime - timev.tv_sec;
 176                 getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
 177                     dqblk.dqb_itime - timev.tv_sec;
 178         }
 179         if (!svc_sendreply(transp, xdr_getquota_rslt, (char *)&getq_rslt)) {
 180                 svcerr_systemerr(transp);
 181         }
 182         if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
 183                 syslog(LOG_ERR, "unable to free arguments");
 184                 exit(1);
 185         }
 186 }
 187
 188 void
 189 printerr_reply(transp)  /* when a reply to a request failed */
 190         SVCXPRT *transp;
 191 {
 192         char   *name;
 193         struct sockaddr_in *caller;
 194         int     save_errno;
 195
 196         save_errno = errno;
 197
 198         caller = svc_getcaller(transp);
 199         name = (char *)inet_ntoa(caller->sin_addr);
 200         errno = save_errno;
 201         if (errno == 0)
 202                 syslog(LOG_ERR, "couldn't send reply to %s", name);
 203         else
 204                 syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
 205 }
 206
 207 /* initialise the fs_tab list from entries in /etc/fstab */
 208 void
 209 initfs()
 210 {
 211         struct fs_stat *fs_current = NULL;
 212         struct fs_stat *fs_next = NULL;
 213         char *qfpathname;
 214         struct fstab *fs;
 215         struct stat st;
 216
 217         setfsent();
 218         while ((fs = getfsent())) {
 219                 if (strcmp(fs->fs_vfstype, "ufs"))
 220                         continue;
 221                 if (!hasquota(fs, &qfpathname))
 222                         continue;
 223
 224                 fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
 225                 fs_current->fs_next = fs_next;  /* next element */
 226
 227                 fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
 228                 strcpy(fs_current->fs_file, fs->fs_file);
 229
 230                 fs_current->qfpathname = malloc(sizeof(char) * (strlen(qfpathname) + 1));
 231                 strcpy(fs_current->qfpathname, qfpathname);
 232
 233                 stat(fs_current->fs_file, &st);
 234                 fs_current->st_dev = st.st_dev;
 235
 236                 fs_next = fs_current;
 237         }
 238         endfsent();
 239         fs_begin = fs_current;
 240 }
 241
 242 /*
 243  * gets the quotas for id, filesystem path.
 244  * Return 0 if fail, 1 otherwise
 245  */
 246 int
 247 getfsquota(id, path, dqblk)
 248         long id;
 249         char   *path;
 250         struct ufs_dqblk *dqblk;
 251 {
 252         struct stat st_path;
 253         struct fs_stat *fs;
 254         int     qcmd, fd, ret = 0;
 255
 256         if (stat(path, &st_path) < 0)
 257                 return (0);
 258
 259         qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
 260
 261         for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
 262                 /* where the devise is the same as path */
 263                 if (fs->st_dev != st_path.st_dev)
 264                         continue;
 265
 266                 /* find the specified filesystem. get and return quota */
 267                 if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
 268                         return (1);
 269
 270                 if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
 271                         syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
 272                         return (0);
 273                 }
 274                 if (lseek(fd, (off_t)(id * sizeof(struct ufs_dqblk)), L_SET) == (off_t)-1) {
 275                         close(fd);
 276                         return (1);
 277                 }
 278                 switch (read(fd, dqblk, sizeof(struct ufs_dqblk))) {
 279                 case 0:
 280                         /*
 281                          * Convert implicit 0 quota (EOF)
 282                          * into an explicit one (zero'ed dqblk)
 283                          */
 284                         bzero((caddr_t) dqblk, sizeof(struct ufs_dqblk));
 285                         ret = 1;
 286                         break;
 287                 case sizeof(struct ufs_dqblk):  /* OK */
 288                         ret = 1;
 289                         break;
 290                 default:        /* ERROR */
 291                         syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
 292                         close(fd);
 293                         return (0);
 294                 }
 295                 close(fd);
 296         }
 297         return (ret);
 298 }
 299
 300 /*
 301  * Check to see if a particular quota is to be enabled.
 302  * Comes from quota.c, NetBSD 0.9
 303  */
 304 int
 305 hasquota(fs, qfnamep)
 306         struct fstab *fs;
 307         char  **qfnamep;
 308 {
 309         static char initname, usrname[100];
 310         static char buf[BUFSIZ];
 311         char    *opt, *cp;
 312         char    *qfextension[] = INITQFNAMES;
 313
 314         if (!initname) {
 315                 sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
 316                 initname = 1;
 317         }
 318         strcpy(buf, fs->fs_mntops);
 319         for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
 320                 if ((cp = index(opt, '=')))
 321                         *cp++ = '\0';
 322                 if (strcmp(opt, usrname) == 0)
 323                         break;
 324         }
 325         if (!opt)
 326                 return (0);
 327         if (cp) {
 328                 *qfnamep = cp;
 329                 return (1);
 330         }
 331         sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME, qfextension[USRQUOTA]);
 332         *qfnamep = buf;
 333         return (1);
 334 }