/*
* by Manuel Bouyer (bouyer@ensta.fr)
*
* There is no copyright, you can use it as you want.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <ufs/ufs/quota.h>
#include <rpc/rpc.h>
#include <rpcsvc/rquota.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ctype.h>
#include <errno.h>
#include <fstab.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
static void rquota_service(struct svc_req *request, SVCXPRT *transp);
static void sendquota(struct svc_req *request, SVCXPRT *transp);
static void initfs(void);
static int getfsquota(long id, char *path, struct dqblk *dqblk);
static int hasquota(struct fstab *fs, char **qfnamep);
/*
* structure containing informations about ufs filesystems
* initialised by initfs()
*/
struct fs_stat {
struct fs_stat *fs_next; /* next element */
char *fs_file; /* mount point of the filesystem */
char *qfpathname; /* pathname of the quota file */
dev_t st_dev; /* device of the filesystem */
} fs_stat;
static struct fs_stat *fs_begin = NULL;
static int from_inetd = 1;
static void
cleanup(int sig)
{
(void)sig;
(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
exit(0);
}
int
main(void)
{
SVCXPRT *transp;
int ok;
struct sockaddr_storage from;
socklen_t fromlen;
fromlen = sizeof(from);
if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
from_inetd = 0;
if (!from_inetd) {
daemon(0, 0);
(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
(void)signal(SIGINT, cleanup);
(void)signal(SIGTERM, cleanup);
(void)signal(SIGHUP, cleanup);
}
openlog("rpc.rquotad", LOG_CONS|LOG_PID, LOG_DAEMON);
/* create and register the service */
if (from_inetd) {
transp = svc_tli_create(0, NULL, NULL, 0, 0);
if (transp == NULL) {
syslog(LOG_ERR, "couldn't create udp service.");
exit(1);
}
ok = svc_reg(transp, RQUOTAPROG, RQUOTAVERS,
rquota_service, NULL);
} else {
ok = svc_create(rquota_service,
RQUOTAPROG, RQUOTAVERS, "udp");
}
if (!ok) {
syslog(LOG_ERR,
"unable to register (RQUOTAPROG, RQUOTAVERS, %s)",
from_inetd ? "(inetd)" : "udp");
exit(1);
}
initfs();
svc_run();
syslog(LOG_ERR, "svc_run returned");
exit(1);
}
static void
rquota_service(struct svc_req *request, SVCXPRT *transp)
{
switch (request->rq_proc) {
case NULLPROC:
(void)svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL);
break;
case RQUOTAPROC_GETQUOTA:
case RQUOTAPROC_GETACTIVEQUOTA:
sendquota(request, transp);
break;
default:
svcerr_noproc(transp);
break;
}
if (from_inetd)
exit(0);
}
/* read quota for the specified id, and send it */
static void
sendquota(struct svc_req *request, SVCXPRT *transp)
{
struct getquota_args getq_args;
struct getquota_rslt getq_rslt;
struct dqblk dqblk;
struct timeval timev;
bzero(&getq_args, sizeof(getq_args));
if (!svc_getargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
svcerr_decode(transp);
return;
}
if (request->rq_cred.oa_flavor != AUTH_UNIX) {
/* bad auth */
getq_rslt.status = Q_EPERM;
} else if (!getfsquota(getq_args.gqa_uid, getq_args.gqa_pathp, &dqblk)) {
/* failed, return noquota */
getq_rslt.status = Q_NOQUOTA;
} else {
gettimeofday(&timev, NULL);
getq_rslt.status = Q_OK;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_active = TRUE;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsize = DEV_BSIZE;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_bhardlimit =
dqblk.dqb_bhardlimit;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_bsoftlimit =
dqblk.dqb_bsoftlimit;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_curblocks =
dqblk.dqb_curblocks;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_fhardlimit =
dqblk.dqb_ihardlimit;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_fsoftlimit =
dqblk.dqb_isoftlimit;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_curfiles =
dqblk.dqb_curinodes;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_btimeleft =
dqblk.dqb_btime - timev.tv_sec;
getq_rslt.getquota_rslt_u.gqr_rquota.rq_ftimeleft =
dqblk.dqb_itime - timev.tv_sec;
}
if (!svc_sendreply(transp, (xdrproc_t)xdr_getquota_rslt, &getq_rslt))
svcerr_systemerr(transp);
if (!svc_freeargs(transp, (xdrproc_t)xdr_getquota_args, &getq_args)) {
syslog(LOG_ERR, "unable to free arguments");
exit(1);
}
}
/* initialise the fs_tab list from entries in /etc/fstab */
static void
initfs(void)
{
struct fs_stat *fs_current = NULL;
struct fs_stat *fs_next = NULL;
char *qfpathname;
struct fstab *fs;
struct stat st;
setfsent();
while ((fs = getfsent())) {
if (strcmp(fs->fs_vfstype, "ufs"))
continue;
if (!hasquota(fs, &qfpathname))
continue;
fs_current = malloc(sizeof(struct fs_stat));
fs_current->fs_next = fs_next; /* next element */
fs_current->fs_file = malloc(strlen(fs->fs_file) + 1);
strcpy(fs_current->fs_file, fs->fs_file);
fs_current->qfpathname = malloc(strlen(qfpathname) + 1);
strcpy(fs_current->qfpathname, qfpathname);
stat(fs_current->fs_file, &st);
fs_current->st_dev = st.st_dev;
fs_next = fs_current;
}
endfsent();
fs_begin = fs_current;
}
/*
* gets the quotas for id, filesystem path.
* Return 0 if fail, 1 otherwise
*/
static int
getfsquota(long id, char *path, struct dqblk *dqblk)
{
struct stat st_path;
struct fs_stat *fs;
int qcmd, fd, ret = 0;
if (stat(path, &st_path) < 0)
return (0);
qcmd = QCMD(Q_GETQUOTA, USRQUOTA);
for (fs = fs_begin; fs != NULL; fs = fs->fs_next) {
/* where the device is the same as path */
if (fs->st_dev != st_path.st_dev)
continue;
/* find the specified filesystem. get and return quota */
if (quotactl(fs->fs_file, qcmd, id, dqblk) == 0)
return (1);
if ((fd = open(fs->qfpathname, O_RDONLY)) < 0) {
syslog(LOG_ERR, "open error: %s: %m", fs->qfpathname);
return (0);
}
if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), L_SET) == (off_t)-1) {
close(fd);
return (1);
}
switch (read(fd, dqblk, sizeof(struct dqblk))) {
case 0:
/*
* Convert implicit 0 quota (EOF)
* into an explicit one (zero'ed dqblk)
*/
bzero(dqblk, sizeof(struct dqblk));
ret = 1;
break;
case sizeof(struct dqblk): /* OK */
ret = 1;
break;
default: /* ERROR */
syslog(LOG_ERR, "read error: %s: %m", fs->qfpathname);
close(fd);
return (0);
}
close(fd);
}
return (ret);
}
/*
* Check to see if a particular quota is to be enabled.
* Comes from quota.c, NetBSD 0.9
*/
static int
hasquota(struct fstab *fs, char **qfnamep)
{
static char initname, usrname[100];
static char buf[BUFSIZ];
char *opt, *cp;
const char *qfextension[] = INITQFNAMES;
if (!initname) {
sprintf(usrname, "%s%s", qfextension[USRQUOTA], QUOTAFILENAME);
initname = 1;
}
strcpy(buf, fs->fs_mntops);
for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
if ((cp = index(opt, '=')))
*cp++ = '\0';
if (strcmp(opt, usrname) == 0)
break;
}
if (!opt)
return (0);
if (cp) {
*qfnamep = cp;
return (1);
}
sprintf(buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME,
qfextension[USRQUOTA]);
*qfnamep = buf;
return (1);
}
