ypxfrd_main.c revision 90297
1/* 2 * Copyright (c) 1995, 1996 3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Bill Paul. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#ifndef lint 34static const char rcsid[] = 35 "$FreeBSD: head/usr.sbin/rpc.ypxfrd/ypxfrd_main.c 90297 2002-02-06 13:30:31Z des $"; 36#endif /* not lint */ 37 38#include "ypxfrd.h" 39#include <err.h> 40#include <fcntl.h> 41#include <paths.h> 42#include <stdio.h> 43#include <stdlib.h> /* getenv, exit */ 44#include <unistd.h> 45#include <rpc/pmap_clnt.h> /* for pmap_unset */ 46#include <string.h> /* strcmp */ 47#include <signal.h> 48#include <sys/ttycom.h> /* TIOCNOTTY */ 49#ifdef __cplusplus 50#include <sysent.h> /* getdtablesize, open */ 51#endif /* __cplusplus */ 52#include <memory.h> 53#include <sys/socket.h> 54#include <netinet/in.h> 55#include <syslog.h> 56#include "ypxfrd_extern.h" 57#include <sys/wait.h> 58#include <errno.h> 59 60#ifndef SIG_PF 61#define SIG_PF void(*)(int) 62#endif 63 64#ifdef DEBUG 65#define RPC_SVC_FG 66#endif 67 68#define _RPCSVC_CLOSEDOWN 120 69int _rpcpmstart; /* Started by a port monitor ? */ 70static int _rpcfdtype; 71 /* Whether Stream or Datagram ? */ 72 /* States a server can be in wrt request */ 73 74#define _IDLE 0 75#define _SERVED 1 76#define _SERVING 2 77 78extern int _rpcsvcstate; /* Set when a request is serviced */ 79 80char *progname = "rpc.ypxfrd"; 81char *yp_dir = "/var/yp/"; 82 83static 84void _msgout(char* msg) 85{ 86#ifdef RPC_SVC_FG 87 if (_rpcpmstart) 88 syslog(LOG_ERR, "%s", msg); 89 else 90 warnx("%s", msg); 91#else 92 syslog(LOG_ERR, "%s", msg); 93#endif 94} 95 96static void 97closedown(int sig) 98{ 99 if (_rpcsvcstate == _IDLE) { 100 extern fd_set svc_fdset; 101 static int size; 102 int i, openfd; 103 104 if (_rpcfdtype == SOCK_DGRAM) 105 exit(0); 106 if (size == 0) { 107 size = getdtablesize(); 108 } 109 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 110 if (FD_ISSET(i, &svc_fdset)) 111 openfd++; 112 if (openfd <= 1) 113 exit(0); 114 } 115 if (_rpcsvcstate == _SERVED) 116 _rpcsvcstate = _IDLE; 117 118 (void) signal(SIGALRM, (SIG_PF) closedown); 119 (void) alarm(_RPCSVC_CLOSEDOWN/2); 120} 121 122 123static void 124ypxfrd_svc_run() 125{ 126#ifdef FD_SETSIZE 127 fd_set readfds; 128#else 129 int readfds; 130#endif /* def FD_SETSIZE */ 131 extern int forked; 132 int pid; 133 int fd_setsize = _rpc_dtablesize(); 134 135 /* Establish the identity of the parent ypserv process. */ 136 pid = getpid(); 137 138 for (;;) { 139#ifdef FD_SETSIZE 140 readfds = svc_fdset; 141#else 142 readfds = svc_fds; 143#endif /* def FD_SETSIZE */ 144 switch (select(fd_setsize, &readfds, NULL, NULL, 145 (struct timeval *)0)) { 146 case -1: 147 if (errno == EINTR) { 148 continue; 149 } 150 warn("svc_run: - select failed"); 151 return; 152 case 0: 153 continue; 154 default: 155 svc_getreqset(&readfds); 156 if (forked && pid != getpid()) 157 exit(0); 158 } 159 } 160} 161 162static void reaper(sig) 163 int sig; 164{ 165 int status; 166 int saved_errno; 167 168 saved_errno = errno; 169 170 if (sig == SIGHUP) { 171 load_securenets(); 172 errno = saved_errno; 173 return; 174 } 175 176 if (sig == SIGCHLD) { 177 while (wait3(&status, WNOHANG, NULL) > 0) 178 children--; 179 } else { 180 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS); 181 exit(0); 182 } 183 184 errno = saved_errno; 185 return; 186} 187 188void usage() 189{ 190 fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n"); 191 exit(0); 192} 193 194int 195main(argc, argv) 196 int argc; 197 char *argv[]; 198{ 199 register SVCXPRT *transp = NULL; 200 int sock; 201 int proto = 0; 202 struct sockaddr_in saddr; 203 int asize = sizeof (saddr); 204 int ch; 205 206 while ((ch = getopt(argc, argv, "p:h")) != -1) { 207 switch (ch) { 208 case 'p': 209 yp_dir = optarg; 210 break; 211 default: 212 usage(); 213 break; 214 } 215 } 216 217 load_securenets(); 218 219 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 220 int ssize = sizeof (int); 221 222 if (saddr.sin_family != AF_INET) 223 exit(1); 224 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 225 (char *)&_rpcfdtype, &ssize) == -1) 226 exit(1); 227 sock = 0; 228 _rpcpmstart = 1; 229 proto = 0; 230 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON); 231 } else { 232#ifndef RPC_SVC_FG 233 int size; 234 int pid, i; 235 236 pid = fork(); 237 if (pid < 0) 238 err(1, "fork"); 239 if (pid) 240 exit(0); 241 size = getdtablesize(); 242 for (i = 0; i < size; i++) 243 (void) close(i); 244 i = open(_PATH_CONSOLE, 2); 245 (void) dup2(i, 1); 246 (void) dup2(i, 2); 247 i = open(_PATH_TTY, 2); 248 if (i >= 0) { 249 (void) ioctl(i, TIOCNOTTY, (char *)NULL); 250 (void) close(i); 251 } 252 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON); 253#endif 254 sock = RPC_ANYSOCK; 255 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS); 256 } 257 258 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 259 transp = svcudp_create(sock); 260 if (transp == NULL) { 261 _msgout("cannot create udp service."); 262 exit(1); 263 } 264 if (!_rpcpmstart) 265 proto = IPPROTO_UDP; 266 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) { 267 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp)."); 268 exit(1); 269 } 270 } 271 272 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 273 transp = svctcp_create(sock, 0, 0); 274 if (transp == NULL) { 275 _msgout("cannot create tcp service."); 276 exit(1); 277 } 278 if (!_rpcpmstart) 279 proto = IPPROTO_TCP; 280 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) { 281 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp)."); 282 exit(1); 283 } 284 } 285 286 if (transp == (SVCXPRT *)NULL) { 287 _msgout("could not create a handle"); 288 exit(1); 289 } 290 if (_rpcpmstart) { 291 (void) signal(SIGALRM, (SIG_PF) closedown); 292 (void) alarm(_RPCSVC_CLOSEDOWN/2); 293 } 294 295 (void) signal(SIGPIPE, SIG_IGN); 296 (void) signal(SIGCHLD, (SIG_PF) reaper); 297 (void) signal(SIGTERM, (SIG_PF) reaper); 298 (void) signal(SIGINT, (SIG_PF) reaper); 299 (void) signal(SIGHUP, (SIG_PF) reaper); 300 301 ypxfrd_svc_run(); 302 _msgout("svc_run returned"); 303 exit(1); 304 /* NOTREACHED */ 305} 306