NetBSD/libexec/rpc.rquotad/rquotad.c

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/* $NetBSD: rquotad.c,v 1.17 2001/01/10 01:50:05 lukem Exp $ */
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/*
* by Manuel Bouyer (bouyer@ensta.fr)
*
* There is no copyright, you can use it as you want.
*/
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#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: rquotad.c,v 1.17 2001/01/10 01:50:05 lukem Exp $");
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#endif
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#include <sys/param.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/stat.h>
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#include <sys/socket.h>
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#include <signal.h>
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#include <stdio.h>
#include <fstab.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
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#include <unistd.h>
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#include <syslog.h>
#include <ufs/ufs/quota.h>
#include <rpc/rpc.h>
#include <rpcsvc/rquota.h>
#include <arpa/inet.h>
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void rquota_service(struct svc_req *request, SVCXPRT *transp);
void sendquota(struct svc_req *request, SVCXPRT *transp);
void printerr_reply(SVCXPRT *transp);
void initfs(void);
int getfsquota(long id, char *path, struct dqblk *dqblk);
int hasquota(struct fstab *fs, char **qfnamep);
void cleanup(int);
int main(int, char *[]);
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/*
* 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;
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char *qfextension[] = INITQFNAMES;
int from_inetd = 1;
void
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cleanup(int dummy)
{
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(void)rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
exit(0);
}
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int
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main(int argc, char *argv[])
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{
SVCXPRT *transp;
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struct sockaddr_storage from;
int fromlen;
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fromlen = sizeof(from);
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if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
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from_inetd = 0;
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if (!from_inetd) {
daemon(0, 0);
(void) rpcb_unset(RQUOTAPROG, RQUOTAVERS, NULL);
(void) signal(SIGINT, cleanup);
(void) signal(SIGTERM, cleanup);
(void) signal(SIGHUP, cleanup);
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}
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openlog("rpc.rquotad", LOG_PID, LOG_DAEMON);
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/* create and register the service */
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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);
}
} else {
if (!svc_create(rquota_service, RQUOTAPROG, RQUOTAVERS, "udp")){
syslog(LOG_ERR,
"unable to create (RQUOTAPROG, RQUOTAVERS).");
exit(1);
}
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}
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initfs(); /* init the fs_stat list */
svc_run();
syslog(LOG_ERR, "svc_run returned");
exit(1);
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}
void
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rquota_service(struct svc_req *request, SVCXPRT *transp)
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{
switch (request->rq_proc) {
case NULLPROC:
(void)svc_sendreply(transp, xdr_void, (char *)NULL);
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break;
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case RQUOTAPROC_GETQUOTA:
case RQUOTAPROC_GETACTIVEQUOTA:
sendquota(request, transp);
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break;
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default:
svcerr_noproc(transp);
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break;
}
if (from_inetd)
exit(0);
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}
/* read quota for the specified id, and send it */
void
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sendquota(struct svc_req *request, SVCXPRT *transp)
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{
struct getquota_args getq_args;
struct getquota_rslt getq_rslt;
struct dqblk dqblk;
struct timeval timev;
memset((char *)&getq_args, 0, sizeof(getq_args));
if (!svc_getargs(transp, xdr_getquota_args, (caddr_t)&getq_args)) {
svcerr_decode(transp);
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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;
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} 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);
}
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}
void
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printerr_reply(SVCXPRT *transp) /* when a reply to a request failed */
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{
char *name;
struct sockaddr_in *caller;
int save_errno;
save_errno = errno;
caller = svc_getcaller(transp);
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name = (char *)inet_ntoa(caller->sin_addr);
errno = save_errno;
if (errno == 0)
syslog(LOG_WARNING, "couldn't send reply to %s", name);
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else
syslog(LOG_WARNING, "couldn't send reply to %s: %m", name);
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}
/* 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();
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while ((fs = getfsent())) {
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if (strcmp(fs->fs_vfstype, MOUNT_FFS))
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continue;
if (!hasquota(fs, &qfpathname))
continue;
fs_current = (struct fs_stat *) malloc(sizeof(struct fs_stat));
if (fs_current == NULL) {
syslog(LOG_ERR, "can't malloc: %m");
exit(1);
}
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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);
}
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fs_current->qfpathname = strdup(qfpathname);
if (fs_current->qfpathname == NULL) {
syslog(LOG_ERR, "can't strdup: %m");
exit(1);
}
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stat(fs->fs_file, &st);
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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
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getfsquota(long id, char *path, struct dqblk *dqblk)
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{
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 */
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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_WARNING, "open error: %s: %m",
fs->qfpathname);
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return (0);
}
if (lseek(fd, (off_t)(id * sizeof(struct dqblk)), SEEK_SET)
== (off_t)-1) {
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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)
*/
memset((caddr_t) dqblk, 0, sizeof(struct dqblk));
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ret = 1;
break;
case sizeof(struct dqblk): /* OK */
ret = 1;
break;
default: /* ERROR */
syslog(LOG_WARNING, "read error: %s: %m",
fs->qfpathname);
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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
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hasquota(struct fstab *fs, char **qfnamep)
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{
static char initname, usrname[100];
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static char buf[MAXPATHLEN];
char *opt, *cp = NULL;
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if (!initname) {
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(void)snprintf(usrname, sizeof usrname, "%s%s",
qfextension[USRQUOTA], QUOTAFILENAME);
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initname = 1;
}
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strncpy(buf, fs->fs_mntops, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = '\0';
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for (opt = strtok(buf, ","); opt; opt = strtok(NULL, ",")) {
if ((cp = strchr(opt, '=')))
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*cp++ = '\0';
if (strcmp(opt, usrname) == 0)
break;
}
if (!opt)
return (0);
if (cp) {
*qfnamep = cp;
return (1);
}
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(void)snprintf(buf, sizeof buf, "%s/%s.%s", fs->fs_file, QUOTAFILENAME,
qfextension[USRQUOTA]);
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*qfnamep = buf;
return (1);
}