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rquotad.c revision 1.18 
      1 /*	$NetBSD: rquotad.c,v 1.18 2002/06/05 23:22:38 itojun Exp $	*/
      2 
      3 /*
      4  * by Manuel Bouyer (bouyer (at) ensta.fr)
      5  *
      6  * There is no copyright, you can use it as you want.
      7  */
      8 
      9 #include <sys/cdefs.h>
     10 #ifndef lint
     11 __RCSID("$NetBSD: rquotad.c,v 1.18 2002/06/05 23:22:38 itojun Exp $");
     12 #endif
     13 
     14 #include <sys/param.h>
     15 #include <sys/types.h>
     16 #include <sys/mount.h>
     17 #include <sys/file.h>
     18 #include <sys/stat.h>
     19 #include <sys/socket.h>
     20 #include <signal.h>
     21 
     22 #include <stdio.h>
     23 #include <fstab.h>
     24 #include <ctype.h>
     25 #include <stdlib.h>
     26 #include <string.h>
     27 #include <pwd.h>
     28 #include <grp.h>
     29 #include <errno.h>
     30 #include <unistd.h>
     31 
     32 #include <syslog.h>
     33 
     34 #include <ufs/ufs/quota.h>
     35 #include <rpc/rpc.h>
     36 #include <rpcsvc/rquota.h>
     37 #include <arpa/inet.h>
     38 
     39 void rquota_service(struct svc_req *request, SVCXPRT *transp);
     40 void sendquota(struct svc_req *request, SVCXPRT *transp);
     41 void initfs(void);
     42 int getfsquota(long id, char *path, struct dqblk *dqblk);
     43 int hasquota(struct fstab *fs, char **qfnamep);
     44 void cleanup(int);
     45 int main(int, char *[]);
     46 
     47 /*
     48  * structure containing informations about ufs filesystems
     49  * initialised by initfs()
     50  */
     51 struct fs_stat {
     52 	struct fs_stat *fs_next;	/* next element */
     53 	char   *fs_file;		/* mount point of the filesystem */
     54 	char   *qfpathname;		/* pathname of the quota file */
     55 	dev_t   st_dev;			/* device of the filesystem */
     56 } fs_stat;
     57 struct fs_stat *fs_begin = NULL;
     58 
     59 char *qfextension[] = INITQFNAMES;
     60 int from_inetd = 1;
     61 
     62 void
     63 cleanup(int dummy)
     64 {
     65 
     66 	(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
     67 	exit(0);
     68 }
     69 
     70 int
     71 main(int argc, char *argv[])
     72 {
     73 	SVCXPRT *transp;
     74 	struct sockaddr_storage from;
     75 	int fromlen;
     76 
     77 	fromlen = sizeof(from);
     78 	if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
     79 		from_inetd = 0;
     80 
     81 	if (!from_inetd) {
     82 		daemon(0, 0);
     83 
     84 		(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
     85 
     86 		(void) signal(SIGINT, cleanup);
     87 		(void) signal(SIGTERM, cleanup);
     88 		(void) signal(SIGHUP, cleanup);
     89 	}
     90 
     91 	openlog("rpc.rquotad", LOG_PID, LOG_DAEMON);
     92 
     93 	/* create and register the service */
     94 	if (from_inetd) {
     95 		transp = svc_dg_create(0, 0, 0);
     96 		if (transp == NULL) {
     97 			syslog(LOG_ERR, "couldn't create udp service.");
     98 			exit(1);
     99 		}
    100 		if (!svc_reg(transp, RQUOTAPROG, RQUOTAVERS, rquota_service,
    101 		    NULL)) {
    102 			syslog(LOG_ERR,
    103 			    "unable to register (RQUOTAPROG, RQUOTAVERS).");
    104 			exit(1);
    105 		}
    106 	} else {
    107 		if (!svc_create(rquota_service, RQUOTAPROG, RQUOTAVERS, "udp")){
    108 			syslog(LOG_ERR,
    109 			    "unable to create (RQUOTAPROG, RQUOTAVERS).");
    110 			exit(1);
    111 		}
    112 	}
    113 
    114 	initfs();		/* init the fs_stat list */
    115 	svc_run();
    116 	syslog(LOG_ERR, "svc_run returned");
    117 	exit(1);
    118 }
    119 
    120 void
    121 rquota_service(struct svc_req *request, SVCXPRT *transp)
    122 {
    123 	switch (request->rq_proc) {
    124 	case NULLPROC:
    125 		(void)svc_sendreply(transp, xdr_void, (char *)NULL);
    126 		break;
    127 
    128 	case RQUOTAPROC_GETQUOTA:
    129 	case RQUOTAPROC_GETACTIVEQUOTA:
    130 		sendquota(request, transp);
    131 		break;
    132 
    133 	default:
    134 		svcerr_noproc(transp);
    135 		break;
    136 	}
    137 	if (from_inetd)
    138 		exit(0);
    139 }
    140 
    141 /* read quota for the specified id, and send it */
    142 void
    143 sendquota(struct svc_req *request, SVCXPRT *transp)
    144 {
    145 	struct getquota_args getq_args;
    146 	struct getquota_rslt getq_rslt;
    147 	struct dqblk dqblk;
    148 	struct timeval timev;
    149 
    150 	memset((char *)&getq_args, 0, sizeof(getq_args));
    151 	if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
    152 		svcerr_decode(transp);
    153 		return;
    154 	}
    155 	if (request->rq_cred.oa_flavor != AUTH_UNIX) {
    156 		/* bad auth */
    157 		getq_rslt.status = Q_EPERM;
    158 	} else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp,
    159 	    &dqblk)) {
    160 		/* failed, return noquota */
    161 		getq_rslt.status = Q_NOQUOTA;
    162 	} else {
    163 		gettimeofday(&timev, NULL);
    164 		getq_rslt.status = Q_OK;
    165 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
    166 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
    167 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
    168 		    dqblk.dqb_bhardlimit;
    169 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
    170 		    dqblk.dqb_bsoftlimit;
    171 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
    172 		    dqblk.dqb_curblocks;
    173 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
    174 		    dqblk.dqb_ihardlimit;
    175 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
    176 		    dqblk.dqb_isoftlimit;
    177 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
    178 		    dqblk.dqb_curinodes;
    179 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
    180 		    dqblk.dqb_btime - timev.tv_sec;
    181 		getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
    182 		    dqblk.dqb_itime - timev.tv_sec;
    183 	}
    184 	if (!svc_sendreply(transp, xdr_getquota_rslt, (char *)&getq_rslt))
    185 		svcerr_systemerr(transp);
    186 	if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
    187 		syslog(LOG_ERR, "unable to free arguments");
    188 		exit(1);
    189 	}
    190 }
    191 
    192 /* initialise the fs_tab list from entries in /etc/fstab */
    193 void
    194 initfs()
    195 {
    196 	struct fs_stat *fs_current = NULL;
    197 	struct fs_stat *fs_next = NULL;
    198 	char *qfpathname;
    199 	struct fstab *fs;
    200 	struct stat st;
    201 
    202 	setfsent();
    203 	while ((fs = getfsent())) {
    204 		if (strcmp(fs->fs_vfstype, MOUNT_FFS))
    205 			continue;
    206 		if (!hasquota(fs, &qfpathname))
    207 			continue;
    208 
    209 		fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
    210 		if (fs_current == NULL) {
    211 			syslog(LOG_ERR, "can't malloc: %m");
    212 			exit(1);
    213 		}
    214 		fs_current->fs_next = fs_next;	/* next element */
    215 
    216 		fs_current->fs_file = strdup(fs->fs_file);
    217 		if (fs_current->fs_file == NULL) {
    218 			syslog(LOG_ERR, "can't strdup: %m");
    219 			exit(1);
    220 		}
    221 
    222 		fs_current->qfpathname = strdup(qfpathname);
    223 		if (fs_current->qfpathname == NULL) {
    224 			syslog(LOG_ERR, "can't strdup: %m");
    225 			exit(1);
    226 		}
    227 
    228 		stat(fs->fs_file, &st);
    229 		fs_current->st_dev = st.st_dev;
    230 
    231 		fs_next = fs_current;
    232 	}
    233 	endfsent();
    234 	fs_begin = fs_current;
    235 }
    236 
    237 /*
    238  * gets the quotas for id, filesystem path.
    239  * Return 0 if fail, 1 otherwise
    240  */
    241 int
    242 getfsquota(long id, char *path, struct dqblk *dqblk)
    243 {
    244 	struct stat st_path;
    245 	struct fs_stat *fs;
    246 	int	qcmd, fd, ret = 0;
    247 
    248 	if (stat(path, &st_path) < 0)
    249 		return (0);
    250 
    251 	qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
    252 
    253 	for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
    254 		/* where the device is the same as path */
    255 		if (fs->st_dev != st_path.st_dev)
    256 			continue;
    257 
    258 		/* find the specified filesystem. get and return quota */
    259 		if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
    260 			return (1);
    261 
    262 		if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
    263 			syslog(LOG_WARNING, "open error: %s: %m",
    264 			    fs->qfpathname);
    265 			return (0);
    266 		}
    267 		if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), SEEK_SET)
    268 		    == (off_t)-1) {
    269 			close(fd);
    270 			return (1);
    271 		}
    272 		switch (read(fd, dqblk, sizeof(struct dqblk))) {
    273 		case 0:
    274 			/*
    275                          * Convert implicit 0 quota (EOF)
    276                          * into an explicit one (zero'ed dqblk)
    277                          */
    278 			memset((caddr_t) dqblk, 0, sizeof(struct dqblk));
    279 			ret = 1;
    280 			break;
    281 		case sizeof(struct dqblk):	/* OK */
    282 			ret = 1;
    283 			break;
    284 		default:	/* ERROR */
    285 			syslog(LOG_WARNING, "read error: %s: %m",
    286 			    fs->qfpathname);
    287 			close(fd);
    288 			return (0);
    289 		}
    290 		close(fd);
    291 	}
    292 	return (ret);
    293 }
    294 
    295 /*
    296  * Check to see if a particular quota is to be enabled.
    297  * Comes from quota.c, NetBSD 0.9
    298  */
    299 int
    300 hasquota(struct fstab *fs, char **qfnamep)
    301 {
    302 	static char initname, usrname[100];
    303 	static char buf[MAXPATHLEN];
    304 	char	*opt, *cp = NULL;
    305 
    306 	if (!initname) {
    307 		(void)snprintf(usrname, sizeof usrname, "%s%s",
    308 		    qfextension[USRQUOTA], QUOTAFILENAME);
    309 		initname = 1;
    310 	}
    311 	strncpy(buf, fs->fs_mntops, sizeof(buf) - 1);
    312 	buf[sizeof(buf) - 1] = '\0';
    313 	for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
    314 		if ((cp = strchr(opt, '=')))
    315 			*cp++ = '\0';
    316 		if (strcmp(opt, usrname) == 0)
    317 			break;
    318 	}
    319 	if (!opt)
    320 		return (0);
    321 	if (cp) {
    322 		*qfnamep = cp;
    323 		return (1);
    324 	}
    325 	(void)snprintf(buf, sizeof buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME,
    326 	    qfextension[USRQUOTA]);
    327 	*qfnamep = buf;
    328 	return (1);
    329 }
    330