496 lines
12 KiB
C
496 lines
12 KiB
C
/* $NetBSD: autil.c,v 1.2 2003/04/12 21:57:16 christos Exp $ */
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/*
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* Copyright (c) 1997-2003 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Id: autil.c,v 1.27 2003/01/25 01:46:24 ib42 Exp
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*
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*/
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/*
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* utilities specified to amd, taken out of the older amd/util.c.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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int NumChild = 0; /* number of children of primary amd */
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static char invalid_keys[] = "\"'!;@ \t\n";
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#ifdef HAVE_TRANSPORT_TYPE_TLI
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# define PARENT_USLEEP_TIME 100000 /* 0.1 seconds */
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#endif /* HAVE_TRANSPORT_TYPE_TLI */
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char *
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strealloc(char *p, char *s)
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{
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int len = strlen(s) + 1;
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p = (char *) xrealloc((voidp) p, len);
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strcpy(p, s);
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#ifdef DEBUG_MEM
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malloc_verify();
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#endif /* DEBUG_MEM */
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return p;
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}
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char **
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strsplit(char *s, int ch, int qc)
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{
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char **ivec;
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int ic = 0;
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int done = 0;
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ivec = (char **) xmalloc((ic + 1) * sizeof(char *));
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while (!done) {
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char *v;
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/*
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* skip to split char
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*/
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while (*s && (ch == ' ' ? (isascii(*s) && isspace((int)*s)) : *s == ch))
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*s++ = '\0';
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/*
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* End of string?
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*/
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if (!*s)
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break;
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/*
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* remember start of string
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*/
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v = s;
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/*
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* skip to split char
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*/
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while (*s && !(ch == ' ' ? (isascii(*s) && isspace((int)*s)) : *s == ch)) {
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if (*s++ == qc) {
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/*
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* Skip past string.
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*/
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s++;
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while (*s && *s != qc)
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s++;
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if (*s == qc)
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s++;
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}
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}
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if (!*s)
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done = 1;
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*s++ = '\0';
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/*
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* save string in new ivec slot
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*/
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ivec[ic++] = v;
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ivec = (char **) xrealloc((voidp) ivec, (ic + 1) * sizeof(char *));
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if (amuDebug(D_STR))
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plog(XLOG_DEBUG, "strsplit saved \"%s\"", v);
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}
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if (amuDebug(D_STR))
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plog(XLOG_DEBUG, "strsplit saved a total of %d strings", ic);
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ivec[ic] = 0;
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return ivec;
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}
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/*
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* Strip off the trailing part of a domain
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* to produce a short-form domain relative
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* to the local host domain.
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* Note that this has no effect if the domain
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* names do not have the same number of
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* components. If that restriction proves
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* to be a problem then the loop needs recoding
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* to skip from right to left and do partial
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* matches along the way -- ie more expensive.
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*/
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static void
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domain_strip(char *otherdom, char *localdom)
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{
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char *p1, *p2;
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if ((p1 = strchr(otherdom, '.')) &&
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(p2 = strchr(localdom, '.')) &&
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STREQ(p1 + 1, p2 + 1))
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*p1 = '\0';
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}
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/*
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* Normalize a host name
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*/
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void
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host_normalize(char **chp)
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{
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/*
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* Normalize hosts is used to resolve host name aliases
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* and replace them with the standard-form name.
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* Invoked with "-n" command line option.
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*/
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if (gopt.flags & CFM_NORMALIZE_HOSTNAMES) {
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struct hostent *hp;
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clock_valid = 0;
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hp = gethostbyname(*chp);
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if (hp && hp->h_addrtype == AF_INET) {
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dlog("Hostname %s normalized to %s", *chp, hp->h_name);
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*chp = strealloc(*chp, (char *) hp->h_name);
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}
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}
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domain_strip(*chp, hostd);
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}
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/*
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* Keys are not allowed to contain " ' ! or ; to avoid
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* problems with macro expansions.
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*/
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int
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valid_key(char *key)
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{
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while (*key)
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if (strchr(invalid_keys, *key++))
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return FALSE;
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return TRUE;
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}
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void
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forcibly_timeout_mp(am_node *mp)
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{
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mntfs *mf = mp->am_mnt;
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/*
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* Arrange to timeout this node
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*/
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if (mf && ((mp->am_flags & AMF_ROOT) ||
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(mf->mf_flags & (MFF_MOUNTING | MFF_UNMOUNTING)))) {
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if (mf->mf_flags & MFF_UNMOUNTING)
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plog(XLOG_WARNING, "node %s is currently being unmounted, ignoring timeout request", mp->am_path);
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else
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plog(XLOG_WARNING, "ignoring timeout request for active node %s", mp->am_path);
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} else {
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plog(XLOG_INFO, "\"%s\" forcibly timed out", mp->am_path);
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mp->am_flags &= ~AMF_NOTIMEOUT;
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mp->am_ttl = clocktime();
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reschedule_timeout_mp();
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}
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}
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void
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mf_mounted(mntfs *mf)
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{
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int quoted;
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int wasmounted = mf->mf_flags & MFF_MOUNTED;
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if (!wasmounted) {
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/*
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* If this is a freshly mounted
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* filesystem then update the
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* mntfs structure...
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*/
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mf->mf_flags |= MFF_MOUNTED;
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mf->mf_error = 0;
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/*
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* Do mounted callback
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*/
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if (mf->mf_ops->mounted) {
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(*mf->mf_ops->mounted) (mf);
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}
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mf->mf_fo = 0;
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}
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/*
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* Log message
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*/
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quoted = strchr(mf->mf_info, ' ') != 0;
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plog(XLOG_INFO, "%s%s%s %s fstype %s on %s",
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quoted ? "\"" : "",
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mf->mf_info,
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quoted ? "\"" : "",
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wasmounted ? "referenced" : "mounted",
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mf->mf_ops->fs_type, mf->mf_mount);
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}
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void
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am_mounted(am_node *mp)
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{
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mntfs *mf = mp->am_mnt;
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mf_mounted(mf);
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#ifdef HAVE_FS_AUTOFS
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if (mf->mf_flags & MFF_AUTOFS)
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autofs_mounted(mp);
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#endif /* HAVE_FS_AUTOFS */
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/*
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* Patch up path for direct mounts
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*/
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if (mp->am_parent && mp->am_parent->am_mnt->mf_fsflags & FS_DIRECT)
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mp->am_path = str3cat(mp->am_path, mp->am_parent->am_path, "/", ".");
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/*
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* Check whether this mount should be cached permanently
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*/
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if (mf->mf_fsflags & FS_NOTIMEOUT) {
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mntent_t mnt;
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mnt.mnt_opts = mf->mf_mopts;
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if (mf->mf_mopts && amu_hasmntopt(&mnt, "unmount"))
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mp->am_flags &= ~AMF_NOTIMEOUT;
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else
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mp->am_flags |= AMF_NOTIMEOUT;
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} else if (mf->mf_mount[1] == '\0' && mf->mf_mount[0] == '/') {
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mp->am_flags |= AMF_NOTIMEOUT;
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} else {
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mntent_t mnt;
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if (mf->mf_mopts) {
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mnt.mnt_opts = mf->mf_mopts;
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if (amu_hasmntopt(&mnt, "nounmount"))
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mp->am_flags |= AMF_NOTIMEOUT;
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if (amu_hasmntopt(&mnt, "unmount"))
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mp->am_flags &= ~AMF_NOTIMEOUT;
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if ((mp->am_timeo = hasmntval(&mnt, "utimeout")) == 0)
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mp->am_timeo = gopt.am_timeo;
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}
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}
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/*
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* If this node is a symlink then
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* compute the length of the returned string.
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*/
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if (mp->am_fattr.na_type == NFLNK)
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mp->am_fattr.na_size = strlen(mp->am_link ? mp->am_link : mp->am_mnt->mf_mount);
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/*
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* Record mount time
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*/
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mp->am_fattr.na_mtime.nt_seconds = mp->am_stats.s_mtime = clocktime();
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new_ttl(mp);
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/*
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* Update mtime of parent node
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*/
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if (mp->am_parent && mp->am_parent->am_mnt)
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mp->am_parent->am_fattr.na_mtime.nt_seconds = mp->am_stats.s_mtime;
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/*
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* This is ugly, but essentially unavoidable
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* Sublinks must be treated separately as type==link
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* when the base type is different.
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*/
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if (mp->am_link && mp->am_mnt->mf_ops != &amfs_link_ops)
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amfs_link_ops.mount_fs(mp, mp->am_mnt);
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#ifdef HAVE_FS_AUTOFS
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if (mp->am_flags & AMF_AUTOFS)
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autofs_mount_succeeded(mp);
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else
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#endif /* HAVE_FS_AUTOFS */
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/*
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* Now, if we can, do a reply to our NFS client here
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* to speed things up.
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*/
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nfs_quick_reply(mp, 0);
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/*
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* Update stats
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*/
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amd_stats.d_mok++;
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}
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int
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mount_node(am_node *mp)
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{
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mntfs *mf = mp->am_mnt;
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int error = 0;
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#ifdef HAVE_FS_AUTOFS
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if (mf->mf_flags & MFF_AUTOFS)
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mf->mf_autofs_fh = autofs_get_fh(mp);
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#endif /* HAVE_FS_AUTOFS */
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mf->mf_flags |= MFF_MOUNTING;
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error = mf->mf_ops->mount_fs(mp, mf);
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/* do this again, it might have changed */
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mf = mp->am_mnt;
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if (error >= 0)
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mf->mf_flags &= ~MFF_MOUNTING;
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if (!error && !(mf->mf_fsflags & FS_MBACKGROUND))
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am_mounted(mp);
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return error;
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}
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void
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am_unmounted(am_node *mp)
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{
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mntfs *mf = mp->am_mnt;
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if (!foreground) /* firewall - should never happen */
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return;
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/*
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* Do unmounted callback
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*/
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if (mf->mf_ops->umounted)
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mf->mf_ops->umounted(mf);
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/*
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* This is ugly, but essentially unavoidable.
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* Sublinks must be treated separately as type==link
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* when the base type is different.
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*/
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if (mp->am_link && mp->am_mnt->mf_ops != &amfs_link_ops)
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amfs_link_ops.umount_fs(mp, mp->am_mnt);
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#ifdef HAVE_FS_AUTOFS
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if (mp->am_flags & AMF_AUTOFS)
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autofs_umount_succeeded(mp);
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#endif /* HAVE_FS_AUTOFS */
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/*
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* Clean up any directories that were made
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*
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* If we remove the mount point of a pending mount, any queued access
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* to it will fail. So don't do it in that case.
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* Also don't do it if the refcount is > 1.
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*/
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if (mf->mf_flags & MFF_MKMNT &&
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mf->mf_refc == 1 &&
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!(mp->am_flags & AMF_REMOUNT)) {
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plog(XLOG_INFO, "removing mountpoint directory '%s'", mf->mf_real_mount);
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rmdirs(mf->mf_real_mount);
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mf->mf_flags &= ~MFF_MKMNT;
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}
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/*
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* If this is a pseudo-directory then adjust the link count
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* in the parent
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*/
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if (mp->am_parent && mp->am_fattr.na_type == NFDIR)
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--mp->am_parent->am_fattr.na_nlink;
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/*
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* Update mtime of parent node
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*/
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if (mp->am_parent && mp->am_parent->am_mnt)
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mp->am_parent->am_fattr.na_mtime.nt_seconds = clocktime();
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if (mp->am_flags & AMF_REMOUNT) {
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char *fname = strdup(mp->am_name);
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am_node *mp_parent = mp->am_parent;
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int error = 0;
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free_map(mp);
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plog(XLOG_INFO, "am_unmounted: remounting %s", fname);
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mp = amfs_auto_lookup_child(mp_parent, fname, &error, VLOOK_CREATE);
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if (mp && error < 0)
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mp = amfs_auto_mount_child(mp, &error);
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if (error > 0) {
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errno = error;
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plog(XLOG_ERROR, "am_unmounted: could not remount %s: %m", fname);
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}
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XFREE(fname);
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} else
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free_map(mp);
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}
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/*
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* Fork the automounter
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*
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* TODO: Need a better strategy for handling errors
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*/
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static int
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dofork(void)
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{
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int pid;
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top:
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pid = fork();
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if (pid < 0) { /* fork error, retry in 1 second */
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sleep(1);
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goto top;
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}
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if (pid == 0) { /* child process (foreground==false) */
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am_set_mypid();
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foreground = 0;
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} else { /* parent process, has one more child */
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NumChild++;
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}
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return pid;
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}
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int
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background(void)
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{
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int pid = dofork();
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if (pid == 0) {
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dlog("backgrounded");
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foreground = 0;
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}
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return pid;
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}
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