374 lines
9.1 KiB
C
374 lines
9.1 KiB
C
/*-
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* Copyright (c) 2009 Rick Macklem, University of Guelph
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/linker.h>
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#include <sys/module.h>
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/stat.h>
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#include <sys/ucred.h>
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#include <sys/uio.h>
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#include <sys/vnode.h>
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#include <sys/wait.h>
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#include <nfs/nfssvc.h>
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#include <rpc/rpc.h>
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#include <fs/nfs/rpcv2.h>
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#include <fs/nfs/nfsproto.h>
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#include <fs/nfs/nfskpiport.h>
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#include <fs/nfs/nfs.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <netdb.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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/* Global defs */
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#ifdef DEBUG
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#define syslog(e, s) fprintf(stderr,(s))
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int debug = 1;
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#else
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int debug = 0;
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#endif
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pid_t children;
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static void nonfs(int);
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static void reapchild(int);
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static void usage(void);
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static void cleanup(int);
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static void child_cleanup(int);
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static void nfscbd_exit(int);
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static void killchildren(void);
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/*
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* Nfs callback server daemon.
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*
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* 1 - do file descriptor and signal cleanup
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* 2 - fork the nfscbd(s)
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* 4 - create callback server socket(s)
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* 5 - set up server socket for rpc
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*
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* For connectionless protocols, just pass the socket into the kernel via.
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* nfssvc().
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* For connection based sockets, loop doing accepts. When you get a new
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* socket from accept, pass the msgsock into the kernel via. nfssvc().
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*/
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int
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main(int argc, char *argv[])
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{
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struct nfscbd_args nfscbdargs;
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struct nfsd_nfscbd_args nfscbdargs2;
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struct sockaddr_in inetaddr, inetpeer;
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fd_set ready, sockbits;
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int ch, connect_type_cnt, len, maxsock, msgsock, error;
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int nfssvc_flag, on, sock, tcpsock, ret, mustfreeai = 0;
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char *cp, princname[128];
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char myname[MAXHOSTNAMELEN], *myfqdnname = NULL;
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struct addrinfo *aip, hints;
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pid_t pid;
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short myport = NFSV4_CBPORT;
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if (modfind("nfscl") < 0) {
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/* Not present in kernel, try loading it */
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if (kldload("nfscl") < 0 ||
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modfind("nfscl") < 0)
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errx(1, "nfscl is not available");
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}
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/*
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* First, get our fully qualified host name, if possible.
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*/
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if (gethostname(myname, MAXHOSTNAMELEN) >= 0) {
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cp = strchr(myname, '.');
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if (cp != NULL && *(cp + 1) != '\0') {
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cp = myname;
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} else {
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/*
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* No domain on myname, so try looking it up.
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*/
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cp = NULL;
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memset((void *)&hints, 0, sizeof (hints));
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hints.ai_flags = AI_CANONNAME;
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error = getaddrinfo(myname, NULL, &hints, &aip);
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if (error == 0) {
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if (aip->ai_canonname != NULL &&
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(cp = strchr(aip->ai_canonname, '.')) != NULL
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&& *(cp + 1) != '\0') {
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cp = aip->ai_canonname;
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mustfreeai = 1;
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} else {
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freeaddrinfo(aip);
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}
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}
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}
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if (cp == NULL)
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warnx("Can't get fully qualified host name");
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myfqdnname = cp;
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}
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princname[0] = '\0';
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#define GETOPT "p:P:"
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#define USAGE "[ -p port_num ] [ -P client_principal ]"
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while ((ch = getopt(argc, argv, GETOPT)) != -1)
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switch (ch) {
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case 'p':
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myport = atoi(optarg);
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if (myport < 1) {
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warnx("port# non-positive, reset to %d",
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NFSV4_CBPORT);
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myport = NFSV4_CBPORT;
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}
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break;
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case 'P':
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cp = optarg;
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if (cp != NULL && strlen(cp) > 0 &&
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strlen(cp) < sizeof (princname)) {
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if (strchr(cp, '@') == NULL &&
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myfqdnname != NULL)
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snprintf(princname, sizeof (princname),
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"%s@%s", cp, myfqdnname);
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else
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strlcpy(princname, cp,
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sizeof (princname));
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} else {
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warnx("client princ invalid. ignored\n");
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}
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break;
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default:
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case '?':
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usage();
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};
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argv += optind;
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argc -= optind;
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if (argc > 0)
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usage();
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if (mustfreeai)
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freeaddrinfo(aip);
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nfscbdargs2.principal = (const char *)princname;
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if (debug == 0) {
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daemon(0, 0);
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(void)signal(SIGTERM, SIG_IGN);
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(void)signal(SIGHUP, SIG_IGN);
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(void)signal(SIGINT, SIG_IGN);
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(void)signal(SIGQUIT, SIG_IGN);
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}
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(void)signal(SIGSYS, nonfs);
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(void)signal(SIGCHLD, reapchild);
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openlog("nfscbd:", LOG_PID, LOG_DAEMON);
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pid = fork();
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if (pid < 0) {
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syslog(LOG_ERR, "fork: %m");
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nfscbd_exit(1);
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} else if (pid > 0) {
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children = pid;
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} else {
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(void)signal(SIGUSR1, child_cleanup);
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setproctitle("server");
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nfssvc_flag = NFSSVC_NFSCBD;
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if (nfssvc(nfssvc_flag, &nfscbdargs2) < 0) {
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syslog(LOG_ERR, "nfssvc: %m");
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nfscbd_exit(1);
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}
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exit(0);
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}
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(void)signal(SIGUSR1, cleanup);
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if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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syslog(LOG_ERR, "can't create udp socket");
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nfscbd_exit(1);
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}
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memset(&inetaddr, 0, sizeof inetaddr);
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inetaddr.sin_family = AF_INET;
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inetaddr.sin_addr.s_addr = INADDR_ANY;
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inetaddr.sin_port = htons(myport);
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inetaddr.sin_len = sizeof(inetaddr);
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ret = bind(sock, (struct sockaddr *)&inetaddr, sizeof(inetaddr));
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/* If bind() fails, this is a restart, so just skip UDP. */
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if (ret == 0) {
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len = sizeof(inetaddr);
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if (getsockname(sock, (struct sockaddr *)&inetaddr, &len) < 0){
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syslog(LOG_ERR, "can't get bound addr");
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nfscbd_exit(1);
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}
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nfscbdargs.port = ntohs(inetaddr.sin_port);
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if (nfscbdargs.port != myport) {
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syslog(LOG_ERR, "BAD PORT#");
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nfscbd_exit(1);
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}
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nfscbdargs.sock = sock;
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nfscbdargs.name = NULL;
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nfscbdargs.namelen = 0;
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if (nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs) < 0) {
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syslog(LOG_ERR, "can't Add UDP socket");
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nfscbd_exit(1);
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}
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}
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(void)close(sock);
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/* Now set up the master server socket waiting for tcp connections. */
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on = 1;
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FD_ZERO(&sockbits);
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connect_type_cnt = 0;
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if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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syslog(LOG_ERR, "can't create tcp socket");
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nfscbd_exit(1);
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}
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if (setsockopt(tcpsock,
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SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0)
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syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m");
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/* sin_port is already set */
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inetaddr.sin_family = AF_INET;
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inetaddr.sin_addr.s_addr = INADDR_ANY;
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inetaddr.sin_port = htons(myport);
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inetaddr.sin_len = sizeof(inetaddr);
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if (bind(tcpsock,
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(struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) {
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syslog(LOG_ERR, "can't bind tcp addr");
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nfscbd_exit(1);
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}
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if (listen(tcpsock, 5) < 0) {
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syslog(LOG_ERR, "listen failed");
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nfscbd_exit(1);
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}
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FD_SET(tcpsock, &sockbits);
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maxsock = tcpsock;
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connect_type_cnt++;
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setproctitle("master");
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/*
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* Loop forever accepting connections and passing the sockets
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* into the kernel for the mounts.
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*/
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for (;;) {
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ready = sockbits;
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if (connect_type_cnt > 1) {
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if (select(maxsock + 1,
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&ready, NULL, NULL, NULL) < 1) {
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syslog(LOG_ERR, "select failed: %m");
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nfscbd_exit(1);
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}
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}
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if (FD_ISSET(tcpsock, &ready)) {
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len = sizeof(inetpeer);
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if ((msgsock = accept(tcpsock,
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(struct sockaddr *)&inetpeer, &len)) < 0) {
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syslog(LOG_ERR, "accept failed: %m");
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nfscbd_exit(1);
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}
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memset(inetpeer.sin_zero, 0,
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sizeof (inetpeer.sin_zero));
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if (setsockopt(msgsock, SOL_SOCKET,
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SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
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syslog(LOG_ERR,
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"setsockopt SO_KEEPALIVE: %m");
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nfscbdargs.sock = msgsock;
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nfscbdargs.name = (caddr_t)&inetpeer;
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nfscbdargs.namelen = sizeof(inetpeer);
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nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs);
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(void)close(msgsock);
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}
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}
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}
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static void
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usage(void)
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{
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errx(1, "usage: nfscbd %s", USAGE);
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}
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static void
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nonfs(int signo __unused)
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{
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syslog(LOG_ERR, "missing system call: NFS not available");
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}
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static void
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reapchild(int signo __unused)
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{
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pid_t pid;
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while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
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if (pid == children)
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children = -1;
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}
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}
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static void
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killchildren(void)
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{
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if (children > 0)
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kill(children, SIGKILL);
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}
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/*
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* Cleanup master after SIGUSR1.
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*/
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static void
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cleanup(int signo __unused)
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{
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nfscbd_exit(0);
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}
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/*
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* Cleanup child after SIGUSR1.
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*/
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static void
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child_cleanup(int signo __unused)
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{
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exit(0);
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}
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static void
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nfscbd_exit(int status __unused)
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{
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killchildren();
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exit(status);
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}
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