nfscbd.c revision 192811
1192811Srmacklem/*- 2192811Srmacklem * Copyright (c) 2009 Rick Macklem, University of Guelph 3192811Srmacklem * All rights reserved. 4192811Srmacklem * 5192811Srmacklem * Redistribution and use in source and binary forms, with or without 6192811Srmacklem * modification, are permitted provided that the following conditions 7192811Srmacklem * are met: 8192811Srmacklem * 1. Redistributions of source code must retain the above copyright 9192811Srmacklem * notice, this list of conditions and the following disclaimer. 10192811Srmacklem * 2. Redistributions in binary form must reproduce the above copyright 11192811Srmacklem * notice, this list of conditions and the following disclaimer in the 12192811Srmacklem * documentation and/or other materials provided with the distribution. 13192811Srmacklem * 14192811Srmacklem * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15192811Srmacklem * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16192811Srmacklem * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17192811Srmacklem * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18192811Srmacklem * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19192811Srmacklem * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20192811Srmacklem * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21192811Srmacklem * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22192811Srmacklem * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23192811Srmacklem * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24192811Srmacklem * SUCH DAMAGE. 25192811Srmacklem * 26192811Srmacklem */ 27192811Srmacklem 28192811Srmacklem#include <sys/cdefs.h> 29192811Srmacklem__FBSDID("$FreeBSD: head/usr.sbin/nfscbd/nfscbd.c 192811 2009-05-26 15:19:04Z rmacklem $"); 30192811Srmacklem 31192811Srmacklem#include <sys/param.h> 32192811Srmacklem#include <sys/ioctl.h> 33192811Srmacklem#include <sys/linker.h> 34192811Srmacklem#include <sys/module.h> 35192811Srmacklem#include <sys/mount.h> 36192811Srmacklem#include <sys/socket.h> 37192811Srmacklem#include <sys/socketvar.h> 38192811Srmacklem#include <sys/stat.h> 39192811Srmacklem#include <sys/ucred.h> 40192811Srmacklem#include <sys/uio.h> 41192811Srmacklem#include <sys/vnode.h> 42192811Srmacklem#include <sys/wait.h> 43192811Srmacklem 44192811Srmacklem#include <nfs/nfssvc.h> 45192811Srmacklem 46192811Srmacklem#include <rpc/rpc.h> 47192811Srmacklem 48192811Srmacklem#include <fs/nfs/nfsproto.h> 49192811Srmacklem#include <fs/nfs/nfskpiport.h> 50192811Srmacklem#include <fs/nfs/nfs.h> 51192811Srmacklem#include <fs/nfs/rpcv2.h> 52192811Srmacklem 53192811Srmacklem#include <err.h> 54192811Srmacklem#include <errno.h> 55192811Srmacklem#include <fcntl.h> 56192811Srmacklem#include <grp.h> 57192811Srmacklem#include <netdb.h> 58192811Srmacklem#include <pwd.h> 59192811Srmacklem#include <signal.h> 60192811Srmacklem#include <stdio.h> 61192811Srmacklem#include <stdlib.h> 62192811Srmacklem#include <string.h> 63192811Srmacklem#include <syslog.h> 64192811Srmacklem#include <unistd.h> 65192811Srmacklem 66192811Srmacklem/* Global defs */ 67192811Srmacklem#ifdef DEBUG 68192811Srmacklem#define syslog(e, s) fprintf(stderr,(s)) 69192811Srmacklemint debug = 1; 70192811Srmacklem#else 71192811Srmacklemint debug = 0; 72192811Srmacklem#endif 73192811Srmacklem 74192811Srmacklempid_t children; 75192811Srmacklem 76192811Srmacklemvoid nonfs(int); 77192811Srmacklemvoid reapchild(int); 78192811Srmacklemvoid usage(void); 79192811Srmacklemvoid cleanup(int); 80192811Srmacklemvoid child_cleanup(int); 81192811Srmacklemvoid nfscbd_exit(int); 82192811Srmacklemvoid killchildren(void); 83192811Srmacklem 84192811Srmacklem/* 85192811Srmacklem * Nfs callback server daemon. 86192811Srmacklem * 87192811Srmacklem * 1 - do file descriptor and signal cleanup 88192811Srmacklem * 2 - fork the nfscbd(s) 89192811Srmacklem * 4 - create callback server socket(s) 90192811Srmacklem * 5 - set up server socket for rpc 91192811Srmacklem * 92192811Srmacklem * For connectionless protocols, just pass the socket into the kernel via. 93192811Srmacklem * nfssvc(). 94192811Srmacklem * For connection based sockets, loop doing accepts. When you get a new 95192811Srmacklem * socket from accept, pass the msgsock into the kernel via. nfssvc(). 96192811Srmacklem */ 97192811Srmacklemint 98192811Srmacklemmain(int argc, char *argv[], char **envp) 99192811Srmacklem{ 100192811Srmacklem struct group *grp; 101192811Srmacklem struct nfscbd_args nfscbdargs; 102192811Srmacklem struct nfsd_nfscbd_args nfscbdargs2; 103192811Srmacklem struct passwd *pwd; 104192811Srmacklem struct ucred *cr; 105192811Srmacklem struct sockaddr_in inetaddr, inetpeer; 106192811Srmacklem struct timeval ktv; 107192811Srmacklem fd_set ready, sockbits; 108192811Srmacklem int ch, connect_type_cnt, i, len, maxsock, msgsock, error; 109192811Srmacklem int nfssvc_flag, on, sock, tcpsock, ret, mustfreeai = 0; 110192811Srmacklem char *cp, **cpp, princname[128]; 111192811Srmacklem char myname[MAXHOSTNAMELEN], *myfqdnname = NULL; 112192811Srmacklem struct addrinfo *aip, hints; 113192811Srmacklem pid_t pid; 114192811Srmacklem sigset_t signew; 115192811Srmacklem short myport = NFSV4_CBPORT; 116192811Srmacklem 117192811Srmacklem if (modfind("nfscl") < 0) { 118192811Srmacklem /* Not present in kernel, try loading it */ 119192811Srmacklem if (kldload("nfscl") < 0 || 120192811Srmacklem modfind("nfscl") < 0) 121192811Srmacklem errx(1, "nfscl is not available"); 122192811Srmacklem } 123192811Srmacklem /* 124192811Srmacklem * First, get our fully qualified host name, if possible. 125192811Srmacklem */ 126192811Srmacklem if (gethostname(myname, MAXHOSTNAMELEN) >= 0) { 127192811Srmacklem cp = strchr(myname, '.'); 128192811Srmacklem if (cp != NULL && *(cp + 1) != '\0') { 129192811Srmacklem cp = myname; 130192811Srmacklem } else { 131192811Srmacklem /* 132192811Srmacklem * No domain on myname, so try looking it up. 133192811Srmacklem */ 134192811Srmacklem cp = NULL; 135192811Srmacklem memset((void *)&hints, 0, sizeof (hints)); 136192811Srmacklem hints.ai_flags = AI_CANONNAME; 137192811Srmacklem error = getaddrinfo(myname, NULL, &hints, &aip); 138192811Srmacklem if (error == 0) { 139192811Srmacklem if (aip->ai_canonname != NULL && 140192811Srmacklem (cp = strchr(aip->ai_canonname, '.')) != NULL 141192811Srmacklem && *(cp + 1) != '\0') { 142192811Srmacklem cp = aip->ai_canonname; 143192811Srmacklem mustfreeai = 1; 144192811Srmacklem } else { 145192811Srmacklem freeaddrinfo(aip); 146192811Srmacklem } 147192811Srmacklem } 148192811Srmacklem } 149192811Srmacklem if (cp == NULL) 150192811Srmacklem warnx("Can't get fully qualified host name"); 151192811Srmacklem myfqdnname = cp; 152192811Srmacklem } 153192811Srmacklem 154192811Srmacklem princname[0] = '\0'; 155192811Srmacklem#define GETOPT "p:P:" 156192811Srmacklem#define USAGE "[ -p port_num ] [ -P client_principal ]" 157192811Srmacklem while ((ch = getopt(argc, argv, GETOPT)) != -1) 158192811Srmacklem switch (ch) { 159192811Srmacklem case 'p': 160192811Srmacklem myport = atoi(optarg); 161192811Srmacklem if (myport < 1) { 162192811Srmacklem warnx("port# non-positive, reset to %d", 163192811Srmacklem NFSV4_CBPORT); 164192811Srmacklem myport = NFSV4_CBPORT; 165192811Srmacklem } 166192811Srmacklem break; 167192811Srmacklem case 'P': 168192811Srmacklem cp = optarg; 169192811Srmacklem if (cp != NULL && strlen(cp) > 0 && 170192811Srmacklem strlen(cp) < sizeof (princname)) { 171192811Srmacklem if (strchr(cp, '@') == NULL && 172192811Srmacklem myfqdnname != NULL) 173192811Srmacklem snprintf(princname, sizeof (princname), 174192811Srmacklem "%s@%s", cp, myfqdnname); 175192811Srmacklem else 176192811Srmacklem strlcpy(princname, cp, 177192811Srmacklem sizeof (princname)); 178192811Srmacklem } else { 179192811Srmacklem warnx("client princ invalid. ignored\n"); 180192811Srmacklem } 181192811Srmacklem break; 182192811Srmacklem default: 183192811Srmacklem case '?': 184192811Srmacklem usage(); 185192811Srmacklem }; 186192811Srmacklem argv += optind; 187192811Srmacklem argc -= optind; 188192811Srmacklem 189192811Srmacklem if (argc > 0) 190192811Srmacklem usage(); 191192811Srmacklem 192192811Srmacklem if (mustfreeai) 193192811Srmacklem freeaddrinfo(aip); 194192811Srmacklem nfscbdargs2.principal = (const char *)princname; 195192811Srmacklem if (debug == 0) { 196192811Srmacklem daemon(0, 0); 197192811Srmacklem (void)signal(SIGTERM, SIG_IGN); 198192811Srmacklem (void)signal(SIGHUP, SIG_IGN); 199192811Srmacklem (void)signal(SIGINT, SIG_IGN); 200192811Srmacklem (void)signal(SIGQUIT, SIG_IGN); 201192811Srmacklem } 202192811Srmacklem (void)signal(SIGSYS, nonfs); 203192811Srmacklem (void)signal(SIGCHLD, reapchild); 204192811Srmacklem 205192811Srmacklem openlog("nfscbd:", LOG_PID, LOG_DAEMON); 206192811Srmacklem 207192811Srmacklem pid = fork(); 208192811Srmacklem if (pid < 0) { 209192811Srmacklem syslog(LOG_ERR, "fork: %m"); 210192811Srmacklem nfscbd_exit(1); 211192811Srmacklem } else if (pid > 0) { 212192811Srmacklem children = pid; 213192811Srmacklem } else { 214192811Srmacklem (void)signal(SIGUSR1, child_cleanup); 215192811Srmacklem setproctitle("server"); 216192811Srmacklem nfssvc_flag = NFSSVC_NFSCBD; 217192811Srmacklem if (nfssvc(nfssvc_flag, &nfscbdargs2) < 0) { 218192811Srmacklem syslog(LOG_ERR, "nfssvc: %m"); 219192811Srmacklem nfscbd_exit(1); 220192811Srmacklem } 221192811Srmacklem exit(0); 222192811Srmacklem } 223192811Srmacklem (void)signal(SIGUSR1, cleanup); 224192811Srmacklem 225192811Srmacklem if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 226192811Srmacklem syslog(LOG_ERR, "can't create udp socket"); 227192811Srmacklem nfscbd_exit(1); 228192811Srmacklem } 229192811Srmacklem memset(&inetaddr, 0, sizeof inetaddr); 230192811Srmacklem inetaddr.sin_family = AF_INET; 231192811Srmacklem inetaddr.sin_addr.s_addr = INADDR_ANY; 232192811Srmacklem inetaddr.sin_port = htons(myport); 233192811Srmacklem inetaddr.sin_len = sizeof(inetaddr); 234192811Srmacklem ret = bind(sock, (struct sockaddr *)&inetaddr, sizeof(inetaddr)); 235192811Srmacklem /* If bind() fails, this is a restart, so just skip UDP. */ 236192811Srmacklem if (ret == 0) { 237192811Srmacklem len = sizeof(inetaddr); 238192811Srmacklem if (getsockname(sock, (struct sockaddr *)&inetaddr, &len) < 0){ 239192811Srmacklem syslog(LOG_ERR, "can't get bound addr"); 240192811Srmacklem nfscbd_exit(1); 241192811Srmacklem } 242192811Srmacklem nfscbdargs.port = ntohs(inetaddr.sin_port); 243192811Srmacklem if (nfscbdargs.port != myport) { 244192811Srmacklem syslog(LOG_ERR, "BAD PORT#"); 245192811Srmacklem nfscbd_exit(1); 246192811Srmacklem } 247192811Srmacklem nfscbdargs.sock = sock; 248192811Srmacklem nfscbdargs.name = NULL; 249192811Srmacklem nfscbdargs.namelen = 0; 250192811Srmacklem if (nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs) < 0) { 251192811Srmacklem syslog(LOG_ERR, "can't Add UDP socket"); 252192811Srmacklem nfscbd_exit(1); 253192811Srmacklem } 254192811Srmacklem } 255192811Srmacklem (void)close(sock); 256192811Srmacklem 257192811Srmacklem /* Now set up the master server socket waiting for tcp connections. */ 258192811Srmacklem on = 1; 259192811Srmacklem FD_ZERO(&sockbits); 260192811Srmacklem connect_type_cnt = 0; 261192811Srmacklem if ((tcpsock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { 262192811Srmacklem syslog(LOG_ERR, "can't create tcp socket"); 263192811Srmacklem nfscbd_exit(1); 264192811Srmacklem } 265192811Srmacklem if (setsockopt(tcpsock, 266192811Srmacklem SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) 267192811Srmacklem syslog(LOG_ERR, "setsockopt SO_REUSEADDR: %m"); 268192811Srmacklem /* sin_port is already set */ 269192811Srmacklem inetaddr.sin_family = AF_INET; 270192811Srmacklem inetaddr.sin_addr.s_addr = INADDR_ANY; 271192811Srmacklem inetaddr.sin_port = htons(myport); 272192811Srmacklem inetaddr.sin_len = sizeof(inetaddr); 273192811Srmacklem if (bind(tcpsock, 274192811Srmacklem (struct sockaddr *)&inetaddr, sizeof (inetaddr)) < 0) { 275192811Srmacklem syslog(LOG_ERR, "can't bind tcp addr"); 276192811Srmacklem nfscbd_exit(1); 277192811Srmacklem } 278192811Srmacklem if (listen(tcpsock, 5) < 0) { 279192811Srmacklem syslog(LOG_ERR, "listen failed"); 280192811Srmacklem nfscbd_exit(1); 281192811Srmacklem } 282192811Srmacklem FD_SET(tcpsock, &sockbits); 283192811Srmacklem maxsock = tcpsock; 284192811Srmacklem connect_type_cnt++; 285192811Srmacklem 286192811Srmacklem setproctitle("master"); 287192811Srmacklem 288192811Srmacklem /* 289192811Srmacklem * Loop forever accepting connections and passing the sockets 290192811Srmacklem * into the kernel for the mounts. 291192811Srmacklem */ 292192811Srmacklem for (;;) { 293192811Srmacklem ready = sockbits; 294192811Srmacklem if (connect_type_cnt > 1) { 295192811Srmacklem if (select(maxsock + 1, 296192811Srmacklem &ready, NULL, NULL, NULL) < 1) { 297192811Srmacklem syslog(LOG_ERR, "select failed: %m"); 298192811Srmacklem nfscbd_exit(1); 299192811Srmacklem } 300192811Srmacklem } 301192811Srmacklem if (FD_ISSET(tcpsock, &ready)) { 302192811Srmacklem len = sizeof(inetpeer); 303192811Srmacklem if ((msgsock = accept(tcpsock, 304192811Srmacklem (struct sockaddr *)&inetpeer, &len)) < 0) { 305192811Srmacklem syslog(LOG_ERR, "accept failed: %m"); 306192811Srmacklem nfscbd_exit(1); 307192811Srmacklem } 308192811Srmacklem memset(inetpeer.sin_zero, 0, 309192811Srmacklem sizeof (inetpeer.sin_zero)); 310192811Srmacklem if (setsockopt(msgsock, SOL_SOCKET, 311192811Srmacklem SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0) 312192811Srmacklem syslog(LOG_ERR, 313192811Srmacklem "setsockopt SO_KEEPALIVE: %m"); 314192811Srmacklem nfscbdargs.sock = msgsock; 315192811Srmacklem nfscbdargs.name = (caddr_t)&inetpeer; 316192811Srmacklem nfscbdargs.namelen = sizeof(inetpeer); 317192811Srmacklem nfssvc(NFSSVC_CBADDSOCK, &nfscbdargs); 318192811Srmacklem (void)close(msgsock); 319192811Srmacklem } 320192811Srmacklem } 321192811Srmacklem} 322192811Srmacklem 323192811Srmacklemvoid 324192811Srmacklemusage(void) 325192811Srmacklem{ 326192811Srmacklem 327192811Srmacklem errx(1, "usage: nfscbd %s", USAGE); 328192811Srmacklem} 329192811Srmacklem 330192811Srmacklemvoid 331192811Srmacklemnonfs(int signo) 332192811Srmacklem{ 333192811Srmacklem syslog(LOG_ERR, "missing system call: NFS not available"); 334192811Srmacklem} 335192811Srmacklem 336192811Srmacklemvoid 337192811Srmacklemreapchild(int signo) 338192811Srmacklem{ 339192811Srmacklem pid_t pid; 340192811Srmacklem int i; 341192811Srmacklem 342192811Srmacklem while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) { 343192811Srmacklem if (pid == children) 344192811Srmacklem children = -1; 345192811Srmacklem } 346192811Srmacklem} 347192811Srmacklem 348192811Srmacklemvoid 349192811Srmacklemkillchildren(void) 350192811Srmacklem{ 351192811Srmacklem int i; 352192811Srmacklem 353192811Srmacklem if (children > 0) 354192811Srmacklem kill(children, SIGKILL); 355192811Srmacklem} 356192811Srmacklem 357192811Srmacklem/* 358192811Srmacklem * Cleanup master after SIGUSR1. 359192811Srmacklem */ 360192811Srmacklemvoid 361192811Srmacklemcleanup(int signo) 362192811Srmacklem{ 363192811Srmacklem nfscbd_exit(0); 364192811Srmacklem} 365192811Srmacklem 366192811Srmacklem/* 367192811Srmacklem * Cleanup child after SIGUSR1. 368192811Srmacklem */ 369192811Srmacklemvoid 370192811Srmacklemchild_cleanup(int signo) 371192811Srmacklem{ 372192811Srmacklem exit(0); 373192811Srmacklem} 374192811Srmacklem 375192811Srmacklemvoid 376192811Srmacklemnfscbd_exit(int status) 377192811Srmacklem{ 378192811Srmacklem killchildren(); 379192811Srmacklem exit(status); 380192811Srmacklem} 381