NetBSD/libexec/rpc.rquotad/rquotad.c

407 lines
9.9 KiB
C

/* $NetBSD: rquotad.c,v 1.23 2006/05/09 20:18:07 mrg Exp $ */
/*
* by Manuel Bouyer (bouyer@ensta.fr). Public domain.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: rquotad.c,v 1.23 2006/05/09 20:18:07 mrg Exp $");
#endif
#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 <stdio.h>
#include <fstab.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>
#include <ufs/ufs/quota.h>
#include <rpc/rpc.h>
#include <rpcsvc/rquota.h>
#include <arpa/inet.h>
void rquota_service(struct svc_req *request, SVCXPRT *transp);
void ext_rquota_service(struct svc_req *request, SVCXPRT *transp);
void sendquota(struct svc_req *request, int vers, SVCXPRT *transp);
void initfs(void);
int getfsquota(int type, long id, char *path, struct dqblk *dqblk);
int hasquota(struct fstab *fs, char **uqfnamep, char **gqfnamep);
void cleanup(int);
int main(int, char *[]);
/*
* 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 *uqfpathname; /* pathname of the user quota file */
char *gqfpathname; /* pathname of the group quota file */
dev_t st_dev; /* device of the filesystem */
} fs_stat;
struct fs_stat *fs_begin = NULL;
char *qfextension[] = INITQFNAMES;
int from_inetd = 1;
void
cleanup(int dummy)
{
(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
(void)rpcb_unset(RQUOTAPROG, EXT_RQUOTAVERS, NULL);
exit(0);
}
int
main(int argc, char *argv[])
{
SVCXPRT *transp;
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) rpcb_unset(RQUOTAPROG, EXT_RQUOTAVERS, NULL);
(void) signal(SIGINT, cleanup);
(void) signal(SIGTERM, cleanup);
(void) signal(SIGHUP, cleanup);
}
openlog("rpc.rquotad", LOG_PID, LOG_DAEMON);
/* create and register the service */
if (from_inetd) {
transp = svc_dg_create(0, 0, 0);
if (transp == NULL) {
syslog(LOG_ERR, "couldn't create udp service.");
exit(1);
}
if (!svc_reg(transp, RQUOTAPROG, RQUOTAVERS, rquota_service,
NULL)) {
syslog(LOG_ERR,
"unable to register (RQUOTAPROG, RQUOTAVERS).");
exit(1);
}
if (!svc_reg(transp, RQUOTAPROG, EXT_RQUOTAVERS,
ext_rquota_service, NULL)) {
syslog(LOG_ERR,
"unable to register (RQUOTAPROG, EXT_RQUOTAVERS).");
exit(1);
}
} else {
if (!svc_create(rquota_service, RQUOTAPROG, RQUOTAVERS, "udp")){
syslog(LOG_ERR,
"unable to create (RQUOTAPROG, RQUOTAVERS).");
exit(1);
}
if (!svc_create(ext_rquota_service, RQUOTAPROG,
EXT_RQUOTAVERS, "udp")){
syslog(LOG_ERR,
"unable to create (RQUOTAPROG, EXT_RQUOTAVERS).");
exit(1);
}
}
initfs(); /* init the fs_stat list */
svc_run();
syslog(LOG_ERR, "svc_run returned");
exit(1);
}
void
rquota_service(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, RQUOTAVERS, transp);
break;
default:
svcerr_noproc(transp);
break;
}
if (from_inetd)
exit(0);
}
void
ext_rquota_service(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, EXT_RQUOTAVERS, transp);
break;
default:
svcerr_noproc(transp);
break;
}
if (from_inetd)
exit(0);
}
/* read quota for the specified id, and send it */
void
sendquota(struct svc_req *request, int vers, SVCXPRT *transp)
{
struct getquota_args getq_args;
struct ext_getquota_args ext_getq_args;
struct getquota_rslt getq_rslt;
struct dqblk dqblk;
struct timeval timev;
memset((char *)&getq_args, 0, sizeof(getq_args));
memset((char *)&ext_getq_args, 0, sizeof(ext_getq_args));
switch (vers) {
case RQUOTAVERS:
if (!svc_getargs(transp, xdr_getquota_args,
(caddr_t)&getq_args)) {
svcerr_decode(transp);
return;
}
ext_getq_args.gqa_pathp = getq_args.gqa_pathp;
ext_getq_args.gqa_id = getq_args.gqa_uid;
ext_getq_args.gqa_type = RQUOTA_USRQUOTA;
break;
case EXT_RQUOTAVERS:
if (!svc_getargs(transp, xdr_ext_getquota_args,
(caddr_t)&ext_getq_args)) {
svcerr_decode(transp);
return;
}
break;
}
if (request->rq_cred.oa_flavor != AUTH_UNIX) {
/* bad auth */
getq_rslt.status = Q_EPERM;
} else if (!getfsquota(ext_getq_args.gqa_type, ext_getq_args.gqa_id,
ext_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);
}
}
/* 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 *uqfpathname, *gqfpathname;
struct fstab *fs;
struct stat st;
setfsent();
while ((fs = getfsent())) {
if (strcmp(fs->fs_vfstype, MOUNT_FFS))
continue;
if (!hasquota(fs, &uqfpathname, &gqfpathname))
continue;
fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
if (fs_current == NULL) {
syslog(LOG_ERR, "can't malloc: %m");
exit(1);
}
fs_current->fs_next = fs_next; /* next element */
fs_current->fs_file = strdup(fs->fs_file);
if (fs_current->fs_file == NULL) {
syslog(LOG_ERR, "can't strdup: %m");
exit(1);
}
if (uqfpathname) {
fs_current->uqfpathname = strdup(uqfpathname);
if (fs_current->uqfpathname == NULL) {
syslog(LOG_ERR, "can't strdup: %m");
exit(1);
}
} else
fs_current->uqfpathname = NULL;
if (gqfpathname) {
fs_current->gqfpathname = strdup(gqfpathname);
if (fs_current->gqfpathname == NULL) {
syslog(LOG_ERR, "can't strdup: %m");
exit(1);
}
} else
fs_current->gqfpathname = NULL;
stat(fs->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(int type, long id, char *path, struct dqblk *dqblk)
{
struct stat st_path;
struct fs_stat *fs;
int qcmd, fd, ret = 0;
char *filename;
if (stat(path, &st_path) < 0)
return (0);
qcmd = QCMD(Q_GETQUOTA, type == RQUOTA_USRQUOTA ? USRQUOTA : GRPQUOTA);
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);
filename = (type == RQUOTA_USRQUOTA) ?
fs->uqfpathname : fs->gqfpathname;
if (filename == NULL)
return 0;
if ((fd = open(filename, O_RDONLY)) < 0) {
syslog(LOG_WARNING, "open error: %s: %m", filename);
return (0);
}
if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), SEEK_SET)
== (off_t)-1) {
close(fd);
return (0);
}
switch (read(fd, dqblk, sizeof(struct dqblk))) {
case 0:
/*
* Convert implicit 0 quota (EOF)
* into an explicit one (zero'ed dqblk)
*/
memset((caddr_t) dqblk, 0, sizeof(struct dqblk));
ret = 1;
break;
case sizeof(struct dqblk): /* OK */
ret = 1;
break;
default: /* ERROR */
syslog(LOG_WARNING, "read error: %s: %m", filename);
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(struct fstab *fs, char **uqfnamep, char **gqfnamep)
{
static char initname=0, usrname[100], grpname[100];
static char buf[MAXPATHLEN], ubuf[MAXPATHLEN], gbuf[MAXPATHLEN];
char *opt, *cp = NULL;
int ret = 0;
if (!initname) {
(void)snprintf(usrname, sizeof usrname, "%s%s",
qfextension[USRQUOTA], QUOTAFILENAME);
(void)snprintf(grpname, sizeof grpname, "%s%s",
qfextension[GRPQUOTA], QUOTAFILENAME);
}
*uqfnamep = NULL;
*gqfnamep = NULL;
(void)strlcpy(buf, fs->fs_mntops, sizeof(buf));
for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
if ((cp = strchr(opt, '=')))
*cp++ = '\0';
if (strcmp(opt, usrname) == 0) {
ret = 1;
if (cp)
*uqfnamep = cp;
else {
(void)snprintf(ubuf, sizeof ubuf, "%s/%s.%s",
fs->fs_file, QUOTAFILENAME,
qfextension[USRQUOTA]);
*uqfnamep = ubuf;
}
} else if (strcmp(opt, grpname) == 0) {
ret = 1;
if (cp)
*gqfnamep = cp;
else {
(void)snprintf(gbuf, sizeof gbuf, "%s/%s.%s",
fs->fs_file, QUOTAFILENAME,
qfextension[GRPQUOTA]);
*gqfnamep = gbuf;
}
}
}
return (ret);
}