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