freebsd-dev/libexec/rpc.rquotad/rquotad.c

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/*
* by Manuel Bouyer (bouyer@ensta.fr)
*
* There is no copyright, you can use it as you want.
*/
#ifndef lint
static const char rcsid[] =
1999-08-28 00:22:10 +00:00
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <signal.h>
#include <ctype.h>
#include <errno.h>
#include <fstab.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include <varargs.h>
#include <ufs/ufs/quota.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpcsvc/rquota.h>
#include <arpa/inet.h>
void rquota_service __P((struct svc_req *request, SVCXPRT *transp));
void sendquota __P((struct svc_req *request, SVCXPRT *transp));
void printerr_reply __P((SVCXPRT *transp));
void initfs __P((void));
int getfsquota __P((long id, char *path, struct dqblk *dqblk));
int hasquota __P((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;
struct fs_stat *fs_begin = NULL;
int from_inetd = 1;
void
cleanup()
{
(void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
exit(0);
}
int
main(argc, argv)
int argc;
char *argv[];
{
SVCXPRT *transp;
int sock = 0;
int proto = 0;
struct sockaddr_in from;
int fromlen;
fromlen = sizeof(from);
if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
from_inetd = 0;
sock = RPC_ANYSOCK;
proto = IPPROTO_UDP;
}
if (!from_inetd) {
daemon(0, 0);
(void) pmap_unset(RQUOTAPROG, RQUOTAVERS);
(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 */
transp = svcudp_create(sock);
if (transp == NULL) {
syslog(LOG_ERR, "couldn't create udp service");
exit(1);
}
if (!svc_register(transp, RQUOTAPROG, RQUOTAVERS, rquota_service, proto)) {
syslog(LOG_ERR, "unable to register (RQUOTAPROG, RQUOTAVERS, %s)", proto?"udp":"(inetd)");
exit(1);
}
initfs(); /* init the fs_stat list */
svc_run();
syslog(LOG_ERR, "svc_run returned");
exit(1);
}
void
rquota_service(request, transp)
struct svc_req *request;
SVCXPRT *transp;
{
switch (request->rq_proc) {
case NULLPROC:
(void)svc_sendreply(transp, 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 */
void
sendquota(request, transp)
struct svc_req *request;
SVCXPRT *transp;
{
struct getquota_args getq_args;
struct getquota_rslt getq_rslt;
struct dqblk dqblk;
struct timeval timev;
bzero((char *)&getq_args, sizeof(getq_args));
if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&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, xdr_getquota_rslt, (char *)&getq_rslt)) {
svcerr_systemerr(transp);
}
if (!svc_freeargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
syslog(LOG_ERR, "unable to free arguments");
exit(1);
}
}
void
printerr_reply(transp) /* when a reply to a request failed */
SVCXPRT *transp;
{
char *name;
struct sockaddr_in *caller;
int save_errno;
save_errno = errno;
caller = svc_getcaller(transp);
name = (char *)inet_ntoa(caller->sin_addr);
errno = save_errno;
if (errno == 0)
syslog(LOG_ERR, "couldn't send reply to %s", name);
else
syslog(LOG_ERR, "couldn't send reply to %s: %m", name);
}
/* initialise the fs_tab list from entries in /etc/fstab */
void
initfs()
{
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 = (struct fs_stat *) malloc(sizeof(struct fs_stat));
fs_current->fs_next = fs_next; /* next element */
fs_current->fs_file = malloc(sizeof(char) * (strlen(fs->fs_file) + 1));
strcpy(fs_current->fs_file, fs->fs_file);
fs_current->qfpathname = malloc(sizeof(char) * (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
*/
int
getfsquota(id, path, dqblk)
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 devise 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((caddr_t) 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
*/
int
hasquota(fs, qfnamep)
struct fstab *fs;
char **qfnamep;
{
static char initname, usrname[100];
static char buf[BUFSIZ];
char *opt, *cp;
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);
}