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