/* $OpenBSD: mopd.c,v 1.15 2006/04/17 18:55:36 maja Exp $ */ /* * Copyright (c) 1993-96 Mats O Jansson. 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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. */ #ifndef lint static const char rcsid[] = "$OpenBSD: mopd.c,v 1.15 2006/04/17 18:55:36 maja Exp $"; #endif /* * mopd - MOP Dump/Load Daemon * * Usage: mopd -a [ -d -f -v ] [ -3 | -4 ] * mopd [ -d -f -v ] [ -3 | -4 ] interface */ #include "os.h" #include "common/common.h" #include "common/mopdef.h" #include "common/device.h" #include "common/print.h" #include "common/pf.h" #include "common/cmp.h" #include "common/get.h" #include "common/dl.h" #include "common/rc.h" #include "process.h" #include "pwd.h" /* * The list of all interfaces that are being listened to. * "selects" on the descriptors in this list. */ struct if_info *iflist; __dead void Loop(void); void Usage(void); void mopProcess(struct if_info *, u_char *); int AllFlag = 0; /* listen on "all" interfaces */ int DebugFlag = 0; /* print debugging messages */ int ForegroundFlag = 0; /* run in foreground */ int VersionFlag = 0; /* print version */ int Not3Flag = 0; /* Not MOP V3 messages. */ int Not4Flag = 0; /* Not MOP V4 messages. */ int promisc = 1; /* Need promisc mode */ extern char *__progname; int main(int argc, char *argv[]) { int c; char *interface; struct passwd *pw; extern char version[]; while ((c = getopt(argc, argv, "34adfv")) != -1) switch (c) { case '3': Not3Flag++; break; case '4': Not4Flag++; break; case 'a': AllFlag++; break; case 'd': DebugFlag++; break; case 'f': ForegroundFlag++; break; case 'v': VersionFlag++; break; default: Usage(); /* NOTREACHED */ } if (VersionFlag) { fprintf(stdout,"%s: version %s\n", __progname, version); exit(0); } interface = argv[optind++]; if ((AllFlag && interface) || (!AllFlag && interface == 0) || (argc > optind) || (Not3Flag && Not4Flag)) Usage(); /* All error reporting is done through syslogs. */ openlog(__progname, LOG_PID | LOG_CONS, LOG_DAEMON); tzset(); if ((pw = getpwnam("_mopd")) == NULL) err(1, "getpwnam"); if ((!ForegroundFlag) && DebugFlag) fprintf(stdout, "%s: not running as daemon, -d given.\n", __progname); if ((!ForegroundFlag) && (!DebugFlag)) if (daemon(0, 0) == -1) err(1, NULL); syslog(LOG_INFO, "%s %s started.", __progname, version); if (AllFlag) deviceInitAll(); else deviceInitOne(interface); if (chroot(MOP_FILE_PATH) == -1) { syslog(LOG_CRIT, "chroot %s: %m", MOP_FILE_PATH); exit(1); } if (chdir("/") == -1) { syslog(LOG_CRIT, "chdir(\"/\"): %m"); exit(1); } if (setgroups(1, &pw->pw_gid) || setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) { syslog(LOG_CRIT, "can't drop privileges: %m"); exit(1); } endpwent(); Loop(); /* NOTREACHED */ } void Usage() { fprintf(stderr, "usage: %s -a [ -d -f -v ] [ -3 | -4 ]\n", __progname); fprintf(stderr, " %s [ -d -f -v ] [ -3 | -4 ] interface\n", __progname); exit(1); } /* * Process incoming packages. */ void mopProcess(struct if_info *ii, u_char *pkt) { u_char *dst, *src; u_short ptype; int idx, trans, len; /* We don't known with transport, Guess! */ trans = mopGetTrans(pkt, 0); /* Ok, return if we don't wan't this message */ if ((trans == TRANS_ETHER) && Not3Flag) return; if ((trans == TRANS_8023) && Not4Flag) return; idx = 0; mopGetHeader(pkt, &idx, &dst, &src, &ptype, &len, trans); /* * Ignore our own transmissions * */ if (mopCmpEAddr(ii->eaddr,src) == 0) return; switch (ptype) { case MOP_K_PROTO_DL: mopProcessDL(stdout, ii, pkt, &idx, dst, src, trans, len); break; case MOP_K_PROTO_RC: mopProcessRC(stdout, ii, pkt, &idx, dst, src, trans, len); break; default: break; } }