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Makefile
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Makefile.depend
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kern.c
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lock_proc.c
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lockd.c
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lockd.h
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lockd_lock.c
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lockd_lock.h
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rpc.lockd.8
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test.c
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Editing: kern.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Berkeley Software Design Inc's name may not be used to endorse or * promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from BSDI kern.c,v 1.2 1998/11/25 22:38:27 don Exp */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/mount.h> #include <sys/queue.h> #include <sys/socket.h> #include <sys/stat.h> #include <netinet/in.h> #include <arpa/inet.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <paths.h> #include <pwd.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <syslog.h> #include <unistd.h> #include <netdb.h> #include "nlm_prot.h" #include <nfs/nfsproto.h> #include <nfs/nfs_lock.h> #include "lockd.h" #include "lockd_lock.h" #include <nfsclient/nfs.h> #define DAEMON_USERNAME "daemon" /* Lock request owner. */ typedef struct __owner { pid_t pid; /* Process ID. */ time_t tod; /* Time-of-day. */ } OWNER; static OWNER owner; static char hostname[MAXHOSTNAMELEN + 1]; /* Hostname. */ static int devfd; static void client_cleanup(void); static const char *from_addr(struct sockaddr *); int lock_request(LOCKD_MSG *); static void set_auth(CLIENT *cl, struct xucred *ucred); void show(LOCKD_MSG *); int test_request(LOCKD_MSG *); int unlock_request(LOCKD_MSG *); static int nfslockdans(int vers, struct lockd_ans *ansp) { ansp->la_vers = vers; return (write(devfd, ansp, sizeof *ansp) <= 0); } /* * will break because fifo needs to be repopened when EOF'd */ #define lockd_seteuid(uid) seteuid(uid) #define d_calls (debug_level > 1) #define d_args (debug_level > 2) static const char * from_addr(struct sockaddr *saddr) { static char inet_buf[INET6_ADDRSTRLEN]; if (getnameinfo(saddr, saddr->sa_len, inet_buf, sizeof(inet_buf), NULL, 0, NI_NUMERICHOST) == 0) return inet_buf; return "???"; } void client_cleanup(void) { (void)lockd_seteuid(0); exit(-1); } /* * client_request -- * Loop around messages from the kernel, forwarding them off to * NLM servers. */ pid_t client_request(void) { LOCKD_MSG msg; int nr, ret; pid_t child; uid_t daemon_uid; struct passwd *pw; /* Open the dev . */ devfd = open(_PATH_DEV _PATH_NFSLCKDEV, O_RDWR | O_NONBLOCK); if (devfd < 0) { syslog(LOG_ERR, "open: %s: %m", _PATH_NFSLCKDEV); goto err; } signal(SIGPIPE, SIG_IGN); /* * Create a separate process, the client code is really a separate * daemon that shares a lot of code. */ switch (child = fork()) { case -1: err(1, "fork"); case 0: setproctitle("client"); break; default: setproctitle("server"); return (child); } signal(SIGHUP, (sig_t)client_cleanup); signal(SIGTERM, (sig_t)client_cleanup); /* Setup. */ (void)time(&owner.tod); owner.pid = getpid(); (void)gethostname(hostname, sizeof(hostname) - 1); pw = getpwnam(DAEMON_USERNAME); if (pw == NULL) { syslog(LOG_ERR, "getpwnam: %s: %m", DAEMON_USERNAME); goto err; } daemon_uid = pw->pw_uid; /* drop our root privileges */ (void)lockd_seteuid(daemon_uid); for (;;) { /* Read the fixed length message. */ if ((nr = read(devfd, &msg, sizeof(msg))) == sizeof(msg)) { if (d_args) show(&msg); if (msg.lm_version != LOCKD_MSG_VERSION) { syslog(LOG_ERR, "unknown msg type: %d", msg.lm_version); } /* * Send it to the NLM server and don't grant the lock * if we fail for any reason. */ switch (msg.lm_fl.l_type) { case F_RDLCK: case F_WRLCK: if (msg.lm_getlk) ret = test_request(&msg); else ret = lock_request(&msg); break; case F_UNLCK: ret = unlock_request(&msg); break; default: ret = 1; syslog(LOG_ERR, "unknown lock type: %d", msg.lm_fl.l_type); break; } if (ret) { struct lockd_ans ans; ans.la_msg_ident = msg.lm_msg_ident; ans.la_errno = EHOSTUNREACH; if (nfslockdans(LOCKD_ANS_VERSION, &ans)) { syslog((errno == EPIPE ? LOG_INFO : LOG_ERR), "process %lu: %m", (u_long)msg.lm_msg_ident.pid); } } } else if (nr == -1) { if (errno != EAGAIN) { syslog(LOG_ERR, "read: %s: %m", _PATH_NFSLCKDEV); goto err; } } else if (nr != 0) { syslog(LOG_ERR, "%s: discard %d bytes", _PATH_NFSLCKDEV, nr); } } /* Reached only on error. */ err: (void)lockd_seteuid(0); _exit (1); } void set_auth(CLIENT *cl, struct xucred *xucred) { int ngroups; ngroups = xucred->cr_ngroups - 1; if (ngroups > NGRPS) ngroups = NGRPS; if (cl->cl_auth != NULL) cl->cl_auth->ah_ops->ah_destroy(cl->cl_auth); cl->cl_auth = authunix_create(hostname, xucred->cr_uid, xucred->cr_groups[0], ngroups, &xucred->cr_groups[1]); } /* * test_request -- * Convert a lock LOCKD_MSG into an NLM request, and send it off. */ int test_request(LOCKD_MSG *msg) { CLIENT *cli; struct timeval timeout = {0, 0}; /* No timeout, no response. */ char dummy; if (d_calls) syslog(LOG_DEBUG, "test request: %s: %s to %s", msg->lm_nfsv3 ? "V4" : "V1/3", msg->lm_fl.l_type == F_WRLCK ? "write" : "read", from_addr((struct sockaddr *)&msg->lm_addr)); if (msg->lm_nfsv3) { struct nlm4_testargs arg4; arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident; arg4.cookie.n_len = sizeof(msg->lm_msg_ident); arg4.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0; arg4.alock.caller_name = hostname; arg4.alock.fh.n_bytes = (char *)&msg->lm_fh; arg4.alock.fh.n_len = msg->lm_fh_len; arg4.alock.oh.n_bytes = (char *)&owner; arg4.alock.oh.n_len = sizeof(owner); arg4.alock.svid = msg->lm_msg_ident.pid; arg4.alock.l_offset = msg->lm_fl.l_start; arg4.alock.l_len = msg->lm_fl.l_len; if ((cli = get_client( (struct sockaddr *)&msg->lm_addr, NLM_VERS4)) == NULL) return (1); set_auth(cli, &msg->lm_cred); (void)clnt_call(cli, NLM_TEST_MSG, (xdrproc_t)xdr_nlm4_testargs, &arg4, (xdrproc_t)xdr_void, &dummy, timeout); } else { struct nlm_testargs arg; arg.cookie.n_bytes = (char *)&msg->lm_msg_ident; arg.cookie.n_len = sizeof(msg->lm_msg_ident); arg.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0; arg.alock.caller_name = hostname; arg.alock.fh.n_bytes = (char *)&msg->lm_fh; arg.alock.fh.n_len = msg->lm_fh_len; arg.alock.oh.n_bytes = (char *)&owner; arg.alock.oh.n_len = sizeof(owner); arg.alock.svid = msg->lm_msg_ident.pid; arg.alock.l_offset = msg->lm_fl.l_start; arg.alock.l_len = msg->lm_fl.l_len; if ((cli = get_client( (struct sockaddr *)&msg->lm_addr, NLM_VERS)) == NULL) return (1); set_auth(cli, &msg->lm_cred); (void)clnt_call(cli, NLM_TEST_MSG, (xdrproc_t)xdr_nlm_testargs, &arg, (xdrproc_t)xdr_void, &dummy, timeout); } return (0); } /* * lock_request -- * Convert a lock LOCKD_MSG into an NLM request, and send it off. */ int lock_request(LOCKD_MSG *msg) { CLIENT *cli; struct nlm4_lockargs arg4; struct nlm_lockargs arg; struct timeval timeout = {0, 0}; /* No timeout, no response. */ char dummy; if (d_calls) syslog(LOG_DEBUG, "lock request: %s: %s to %s", msg->lm_nfsv3 ? "V4" : "V1/3", msg->lm_fl.l_type == F_WRLCK ? "write" : "read", from_addr((struct sockaddr *)&msg->lm_addr)); if (msg->lm_nfsv3) { arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident; arg4.cookie.n_len = sizeof(msg->lm_msg_ident); arg4.block = msg->lm_wait ? 1 : 0; arg4.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0; arg4.alock.caller_name = hostname; arg4.alock.fh.n_bytes = (char *)&msg->lm_fh; arg4.alock.fh.n_len = msg->lm_fh_len; arg4.alock.oh.n_bytes = (char *)&owner; arg4.alock.oh.n_len = sizeof(owner); arg4.alock.svid = msg->lm_msg_ident.pid; arg4.alock.l_offset = msg->lm_fl.l_start; arg4.alock.l_len = msg->lm_fl.l_len; arg4.reclaim = 0; arg4.state = nsm_state; if ((cli = get_client( (struct sockaddr *)&msg->lm_addr, NLM_VERS4)) == NULL) return (1); set_auth(cli, &msg->lm_cred); (void)clnt_call(cli, NLM_LOCK_MSG, (xdrproc_t)xdr_nlm4_lockargs, &arg4, (xdrproc_t)xdr_void, &dummy, timeout); } else { arg.cookie.n_bytes = (char *)&msg->lm_msg_ident; arg.cookie.n_len = sizeof(msg->lm_msg_ident); arg.block = msg->lm_wait ? 1 : 0; arg.exclusive = msg->lm_fl.l_type == F_WRLCK ? 1 : 0; arg.alock.caller_name = hostname; arg.alock.fh.n_bytes = (char *)&msg->lm_fh; arg.alock.fh.n_len = msg->lm_fh_len; arg.alock.oh.n_bytes = (char *)&owner; arg.alock.oh.n_len = sizeof(owner); arg.alock.svid = msg->lm_msg_ident.pid; arg.alock.l_offset = msg->lm_fl.l_start; arg.alock.l_len = msg->lm_fl.l_len; arg.reclaim = 0; arg.state = nsm_state; if ((cli = get_client( (struct sockaddr *)&msg->lm_addr, NLM_VERS)) == NULL) return (1); set_auth(cli, &msg->lm_cred); (void)clnt_call(cli, NLM_LOCK_MSG, (xdrproc_t)xdr_nlm_lockargs, &arg, (xdrproc_t)xdr_void, &dummy, timeout); } return (0); } /* * unlock_request -- * Convert an unlock LOCKD_MSG into an NLM request, and send it off. */ int unlock_request(LOCKD_MSG *msg) { CLIENT *cli; struct nlm4_unlockargs arg4; struct nlm_unlockargs arg; struct timeval timeout = {0, 0}; /* No timeout, no response. */ char dummy; if (d_calls) syslog(LOG_DEBUG, "unlock request: %s: to %s", msg->lm_nfsv3 ? "V4" : "V1/3", from_addr((struct sockaddr *)&msg->lm_addr)); if (msg->lm_nfsv3) { arg4.cookie.n_bytes = (char *)&msg->lm_msg_ident; arg4.cookie.n_len = sizeof(msg->lm_msg_ident); arg4.alock.caller_name = hostname; arg4.alock.fh.n_bytes = (char *)&msg->lm_fh; arg4.alock.fh.n_len = msg->lm_fh_len; arg4.alock.oh.n_bytes = (char *)&owner; arg4.alock.oh.n_len = sizeof(owner); arg4.alock.svid = msg->lm_msg_ident.pid; arg4.alock.l_offset = msg->lm_fl.l_start; arg4.alock.l_len = msg->lm_fl.l_len; if ((cli = get_client( (struct sockaddr *)&msg->lm_addr, NLM_VERS4)) == NULL) return (1); set_auth(cli, &msg->lm_cred); (void)clnt_call(cli, NLM_UNLOCK_MSG, (xdrproc_t)xdr_nlm4_unlockargs, &arg4, (xdrproc_t)xdr_void, &dummy, timeout); } else { arg.cookie.n_bytes = (char *)&msg->lm_msg_ident; arg.cookie.n_len = sizeof(msg->lm_msg_ident); arg.alock.caller_name = hostname; arg.alock.fh.n_bytes = (char *)&msg->lm_fh; arg.alock.fh.n_len = msg->lm_fh_len; arg.alock.oh.n_bytes = (char *)&owner; arg.alock.oh.n_len = sizeof(owner); arg.alock.svid = msg->lm_msg_ident.pid; arg.alock.l_offset = msg->lm_fl.l_start; arg.alock.l_len = msg->lm_fl.l_len; if ((cli = get_client( (struct sockaddr *)&msg->lm_addr, NLM_VERS)) == NULL) return (1); set_auth(cli, &msg->lm_cred); (void)clnt_call(cli, NLM_UNLOCK_MSG, (xdrproc_t)xdr_nlm_unlockargs, &arg, (xdrproc_t)xdr_void, &dummy, timeout); } return (0); } int lock_answer(int pid, netobj *netcookie, int result, int *pid_p, int version) { struct lockd_ans ans; if (netcookie->n_len != sizeof(ans.la_msg_ident)) { if (pid == -1) { /* we're screwed */ syslog(LOG_ERR, "inedible nlm cookie"); return -1; } ans.la_msg_ident.pid = pid; ans.la_msg_ident.msg_seq = -1; } else { memcpy(&ans.la_msg_ident, netcookie->n_bytes, sizeof(ans.la_msg_ident)); } if (d_calls) syslog(LOG_DEBUG, "lock answer: pid %lu: %s %d", (unsigned long)ans.la_msg_ident.pid, version == NLM_VERS4 ? "nlmv4" : "nlmv3", result); ans.la_set_getlk_pid = 0; if (version == NLM_VERS4) switch (result) { case nlm4_granted: ans.la_errno = 0; break; default: ans.la_errno = EACCES; break; case nlm4_denied: if (pid_p == NULL) ans.la_errno = EAGAIN; else { /* this is an answer to a nlm_test msg */ ans.la_set_getlk_pid = 1; ans.la_getlk_pid = *pid_p; ans.la_errno = 0; } break; case nlm4_denied_nolocks: ans.la_errno = EAGAIN; break; case nlm4_blocked: return -1; /* NOTREACHED */ case nlm4_denied_grace_period: ans.la_errno = EAGAIN; break; case nlm4_deadlck: ans.la_errno = EDEADLK; break; case nlm4_rofs: ans.la_errno = EROFS; break; case nlm4_stale_fh: ans.la_errno = ESTALE; break; case nlm4_fbig: ans.la_errno = EFBIG; break; case nlm4_failed: ans.la_errno = EACCES; break; } else switch (result) { case nlm_granted: ans.la_errno = 0; break; default: ans.la_errno = EACCES; break; case nlm_denied: if (pid_p == NULL) ans.la_errno = EAGAIN; else { /* this is an answer to a nlm_test msg */ ans.la_set_getlk_pid = 1; ans.la_getlk_pid = *pid_p; ans.la_errno = 0; } break; case nlm_denied_nolocks: ans.la_errno = EAGAIN; break; case nlm_blocked: return -1; /* NOTREACHED */ case nlm_denied_grace_period: ans.la_errno = EAGAIN; break; case nlm_deadlck: ans.la_errno = EDEADLK; break; } if (nfslockdans(LOCKD_ANS_VERSION, &ans)) { syslog(((errno == EPIPE || errno == ESRCH) ? LOG_INFO : LOG_ERR), "process %lu: %m", (u_long)ans.la_msg_ident.pid); return -1; } return 0; } /* * show -- * Display the contents of a kernel LOCKD_MSG structure. */ void show(LOCKD_MSG *mp) { static char hex[] = "0123456789abcdef"; struct fid *fidp; fsid_t *fsidp; size_t len; u_int8_t *p, *t, buf[NFS_SMALLFH*3+1]; syslog(LOG_DEBUG, "process ID: %lu\n", (long)mp->lm_msg_ident.pid); fsidp = (fsid_t *)&mp->lm_fh; fidp = (struct fid *)((u_int8_t *)&mp->lm_fh + sizeof(fsid_t)); for (t = buf, p = (u_int8_t *)mp->lm_fh, len = mp->lm_fh_len; len > 0; ++p, --len) { *t++ = '\\'; *t++ = hex[(*p & 0xf0) >> 4]; *t++ = hex[*p & 0x0f]; } *t = '\0'; syslog(LOG_DEBUG, "fh_len %d, fh %s\n", (int)mp->lm_fh_len, buf); /* Show flock structure. */ syslog(LOG_DEBUG, "start %llu; len %llu; pid %lu; type %d; whence %d\n", (unsigned long long)mp->lm_fl.l_start, (unsigned long long)mp->lm_fl.l_len, (u_long)mp->lm_fl.l_pid, mp->lm_fl.l_type, mp->lm_fl.l_whence); /* Show wait flag. */ syslog(LOG_DEBUG, "wait was %s\n", mp->lm_wait ? "set" : "not set"); }
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