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