/***************************************************************************** * * File ..................: mbtask/mbtask.c * Purpose ...............: MBSE BBS Task Manager * Last modification date : 19-Oct-2001 * ***************************************************************************** * Copyright (C) 1997-2001 * * Michiel Broek FIDO: 2:280/2802 * Beekmansbos 10 * 1971 BV IJmuiden * the Netherlands * * This file is part of MBSE BBS. * * This BBS is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * MBSE BBS is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with MBSE BBS; see the file COPYING. If not, write to the Free * Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. *****************************************************************************/ #include "libs.h" #include "../lib/structs.h" #include "signame.h" #include "taskstat.h" #include "taskutil.h" #include "taskregs.h" #include "taskcomm.h" #include "outstat.h" #include "nodelist.h" #include "mbtask.h" /* * Defines. * SLOWRUN is number of seconds for mailer calls. Use between 5 and 30. */ #define MAXTASKS 10 #define SLOWRUN 20 #define TMPNAME "TMP." #define LCKNAME "LOCKTASK" #define ICMP_BASEHDR_LEN 8 #define ICMP_MAX_ERRS 5 #define SET_SOCKA_LEN4(socka) #define Copyright "Copyright (C) 1997-2001 Michiel Broek, All Rights Reserved" typedef enum {P_INIT, P_SENT, P_FAIL, P_OK, P_ERROR, P_NONE} PINGSTATE; /* * Global variables */ static onetask task[MAXTASKS]; /* Array with tasks */ reg_info reginfo[MAXCLIENT]; /* Array with clients */ static pid_t pgrp; /* Pids group */ static char lockfile[PATH_MAX]; /* Lockfile */ int sock = -1; /* Datagram socket */ struct sockaddr_un servaddr; /* Server address */ struct sockaddr_un from; /* From address */ int fromlen; static char spath[PATH_MAX]; /* Socket path */ int logtrans = 0; /* Log transactions */ struct taskrec TCFG; /* Task config record */ struct sysconfig CFG; /* System config */ struct _nodeshdr nodeshdr; /* Nodes header record */ struct _nodes nodes; /* Nodes data record */ struct _fidonethdr fidonethdr; /* Fidonet header rec. */ struct _fidonet fidonet; /* Fidonet data record */ time_t tcfg_time; /* Config record time */ time_t cfg_time; /* Config record time */ char tcfgfn[PATH_MAX]; /* Config file name */ char cfgfn[PATH_MAX]; /* Config file name */ int ping_isocket; /* Ping socket */ int icmp_errs = 0; /* ICMP error counter */ int internet = FALSE; /* Internet is down */ float Load; /* System Load */ int Processing; /* Is system running */ int ZMH = FALSE; /* Zone Mail Hour */ int UPSalarm = FALSE; /* UPS alarm status */ extern int s_bbsopen; /* BBS open semafore */ extern int s_scanout; /* Scan outbound sema */ extern int s_mailout; /* Mail out semafore */ extern int s_mailin; /* Mail in semafore */ extern int s_index; /* Compile nl semafore */ extern int s_newnews; /* New news semafore */ extern int s_reqindex; /* Create req index sem */ extern int s_msglink; /* Messages link sem */ int pingstate = P_INIT; /* Ping state */ int pingnr = 1; /* Ping #, 1 or 2 */ int pingresult[2]; /* Ping results */ char pingaddress[41]; /* Ping current address */ /* * Load main configuration, if it doesn't exist, create it. * This is the case the very first time when you start MBSE BBS. */ void load_maincfg(void) { FILE *fp; struct utsname un; int i; if ((fp = fopen(cfgfn, "r")) == NULL) { memset(&CFG, 0, sizeof(CFG)); /* * Fill Registration defaults */ sprintf(CFG.bbs_name, "MBSE BBS"); uname((struct utsname *)&un); #ifdef __USE_GNU sprintf(CFG.sysdomain, "%s.%s", un.nodename, un.domainname); #else #ifdef __linux__ sprintf(CFG.sysdomain, "%s.%s", un.nodename, un.__domainname); #endif #endif sprintf(CFG.comment, "MBSE BBS development"); sprintf(CFG.origin, "MBSE BBS. Made in the Netherlands"); sprintf(CFG.location, "Earth"); /* * Fill Filenames defaults */ sprintf(CFG.logfile, "system.log"); sprintf(CFG.error_log, "error.log"); sprintf(CFG.default_menu, "main.mnu"); sprintf(CFG.current_language, "english.lang"); sprintf(CFG.chat_log, "chat.log"); sprintf(CFG.welcome_logo, "logo.asc"); /* * Fill Global defaults */ sprintf(CFG.bbs_menus, "%s/english/menus", getenv("MBSE_ROOT")); sprintf(CFG.bbs_txtfiles, "%s/english/txtfiles", getenv("MBSE_ROOT")); sprintf(CFG.bbs_usersdir, "%s/home", getenv("MBSE_ROOT")); sprintf(CFG.nodelists, "/var/spool/mbse/nodelist"); sprintf(CFG.inbound, "/var/spool/mbse/unknown"); sprintf(CFG.pinbound, "/var/spool/mbse/inbound"); sprintf(CFG.outbound, "/var/spool/mbse/outbound"); sprintf(CFG.msgs_path, "/var/spool/mbse/msgs"); sprintf(CFG.dospath, "a:"); /* The biggest floppy on earth, JvdW. */ sprintf(CFG.uxpath, "/var/spool/mbse"); sprintf(CFG.badtic, "/var/spool/mbse/badtic"); sprintf(CFG.ticout, "/var/spool/mbse/ticqueue"); sprintf(CFG.req_magic, "%s/magic", getenv("MBSE_ROOT")); /* * Newfiles reports */ sprintf(CFG.ftp_base, "/var/spool/mbse/ftp"); CFG.newdays = 30; CFG.security.level = 20; CFG.new_split = 27; CFG.new_force = 30; /* * BBS Globals */ CFG.CityLen = 6; CFG.max_login = 5; CFG.elite_mode = FALSE; CFG.exclude_sysop = TRUE; CFG.iConnectString = FALSE; CFG.iAskFileProtocols = FALSE; CFG.sysop_access = 32000; CFG.password_length = 4; CFG.iPasswd_Char = '.'; CFG.idleout = 3; CFG.iQuota = 10; CFG.iCRLoginCount = 10; CFG.bbs_loglevel = DLOG_ALLWAYS | DLOG_ERROR | DLOG_ATTENT | DLOG_NORMAL | DLOG_VERBOSE; CFG.util_loglevel = DLOG_ALLWAYS | DLOG_ERROR | DLOG_ATTENT | DLOG_NORMAL | DLOG_VERBOSE; CFG.OLR_NewFileLimit = 30; CFG.OLR_MaxReq = 25; CFG.slow_util = TRUE; CFG.iCrashLevel = 100; CFG.iAttachLevel = 100; CFG.new_groups = 25; CFG.slow_util = TRUE; CFG.iCrashLevel = 100; CFG.iAttachLevel = 100; CFG.new_groups = 25; sprintf(CFG.startname, "bbs"); CFG.freespace = 10; /* * New Users */ CFG.newuser_access.level = 5; CFG.iCapUserName = TRUE; CFG.iAnsi = TRUE; CFG.iDataPhone = TRUE; CFG.iVoicePhone = TRUE; CFG.iDOB = TRUE; CFG.iTelephoneScan = TRUE; CFG.iLocation = TRUE; CFG.iHotkeys = TRUE; CFG.iCapLocation = FALSE; CFG.AskAddress = FALSE; CFG.GiveEmail = TRUE; /* * Colors */ CFG.TextColourF = 3; CFG.TextColourB = 0; CFG.UnderlineColourF = 14; CFG.UnderlineColourB = 0; CFG.InputColourF = 11; CFG.InputColourB = 0; CFG.CRColourF = 15; CFG.CRColourB = 0; CFG.MoreF = 13; CFG.MoreB = 0; CFG.HiliteF = 15; CFG.HiliteB = 0; CFG.FilenameF = 14; CFG.FilenameB = 0; CFG.FilesizeF = 13; CFG.FilesizeB = 0; CFG.FiledateF = 10; CFG.FiledateB = 0; CFG.FiledescF = 3; CFG.FiledescB = 0; CFG.MsgInputColourF = 3; CFG.MsgInputColourB = 0; /* * NextUser Door */ sprintf(CFG.sNuScreen, "welcome"); sprintf(CFG.sNuQuote, "Please press [ENTER] to continue: "); /* * Safe Door */ CFG.iSafeFirstDigit = 1; CFG.iSafeSecondDigit = 2; CFG.iSafeThirdDigit = 3; CFG.iSafeMaxTrys = 4; CFG.iSafeMaxNumber = 20; CFG.iSafeNumGen = FALSE; strcpy(CFG.sSafePrize, "Free access for a year!"); sprintf(CFG.sSafeWelcome, "safewel"); sprintf(CFG.sSafeOpened, "safeopen"); /* * Paging */ CFG.iPageLength = 30; CFG.iMaxPageTimes = 5; CFG.iAskReason = TRUE; CFG.iSysopArea = 1; CFG.iExternalChat = FALSE; strcpy(CFG.sExternalChat, "/usr/local/bin/chat"); CFG.iAutoLog = TRUE; strcpy(CFG.sChatDevice, "/dev/tty01"); CFG.iChatPromptChk = TRUE; CFG.iStopChatTime = TRUE; for (i = 0; i < 7; i++) { sprintf(CFG.cStartTime[i], "18:00"); sprintf(CFG.cStopTime[i], "23:59"); } /* * Time Bank */ CFG.iMaxTimeBalance = 200; CFG.iMaxTimeWithdraw = 100; CFG.iMaxTimeDeposit = 60; CFG.iMaxByteBalance = 500; CFG.iMaxByteWithdraw = 300; CFG.iMaxByteDeposit = 150; strcpy(CFG.sTimeRatio, "3:1"); strcpy(CFG.sByteRatio, "3:1"); /* * Fill ticconf defaults */ CFG.ct_ResFuture = TRUE; CFG.ct_ReplExt = TRUE; CFG.ct_PlusAll = TRUE; CFG.ct_Notify = TRUE; CFG.ct_Message = TRUE; CFG.ct_TIC = TRUE; CFG.tic_days = 30; sprintf(CFG.hatchpasswd, "DizIzMyBIGseeKret"); CFG.drspace = 2048; CFG.tic_systems = 10; CFG.tic_groups = 25; CFG.tic_dupes = 16000; /* * Fill Mail defaults */ CFG.maxpktsize = 150; CFG.maxarcsize = 300; sprintf(CFG.badboard, "/var/spool/mbse/mail/badmail"); sprintf(CFG.dupboard, "/var/spool/mbse/mail/dupmail"); sprintf(CFG.popnode, "localhost"); sprintf(CFG.smtpnode, "localhost"); sprintf(CFG.nntpnode, "localhost"); CFG.toss_days = 30; CFG.toss_dupes = 16000; CFG.toss_old = 60; CFG.defmsgs = 500; CFG.defdays = 90; CFG.toss_systems = 10; CFG.toss_groups = 25; CFG.UUCPgate.zone = 2; CFG.UUCPgate.net = 292; CFG.UUCPgate.node = 875; sprintf(CFG.UUCPgate.domain, "fidonet"); CFG.nntpdupes = 16000; for (i = 0; i < 32; i++) sprintf(CFG.fname[i], "Flag %d", i+1); /* * Fido mailer defaults */ CFG.timeoutreset = 3L; CFG.timeoutconnect = 60L; sprintf(CFG.phonetrans[0].match, "31-255"); sprintf(CFG.phonetrans[1].match, "31-"); sprintf(CFG.phonetrans[1].repl, "0"); sprintf(CFG.phonetrans[2].repl, "00"); CFG.Speed = 9600; CFG.dialdelay = 60; sprintf(CFG.Flags, "CM,XX,IBN,IFC,ITN"); CFG.cico_loglevel = DLOG_ALLWAYS | DLOG_ERROR | DLOG_ATTENT | DLOG_NORMAL | DLOG_VERBOSE; /* * FTP Server */ CFG.ftp_limit = 20; CFG.ftp_loginfails = 2; CFG.ftp_compress = TRUE; CFG.ftp_tar = TRUE; CFG.ftp_log_cmds = TRUE; CFG.ftp_anonymousok = TRUE; CFG.ftp_mbseok = FALSE; sprintf(CFG.ftp_readme_login, "README*"); sprintf(CFG.ftp_readme_cwd, "README*"); sprintf(CFG.ftp_msg_login, "/welcome.msg"); sprintf(CFG.ftp_msg_cwd, ".message"); sprintf(CFG.ftp_msg_shutmsg, "/etc/nologin"); sprintf(CFG.ftp_upl_path, "%s/incoming", CFG.ftp_base); sprintf(CFG.ftp_banner, "%s/etc/ftpbanner", getenv("MBSE_ROOT")); sprintf(CFG.ftp_email, "sysop@%s", CFG.sysdomain); sprintf(CFG.ftp_pth_filter, "^[-A-Za-z0-9_\\.]*$ ^\\. ^-"); sprintf(CFG.ftp_pth_message, "%s/etc/pathmsg", getenv("MBSE_ROOT")); /* * WWW defaults */ sprintf(CFG.www_root, "/var/lib/apache/htdocs"); sprintf(CFG.www_link2ftp, "files"); sprintf(CFG.www_url, "http://%s", CFG.sysdomain); sprintf(CFG.www_charset, "ISO 8859-1"); sprintf(CFG.www_tbgcolor, "Silver"); sprintf(CFG.www_hbgcolor, "Aqua"); sprintf(CFG.www_author, "Your Name"); sprintf(CFG.www_convert,"/usr/X11R6/bin/convert -geometry x100"); sprintf(CFG.www_icon_home, "up.gif"); sprintf(CFG.www_name_home, "Home"); sprintf(CFG.www_icon_back, "back.gif"); sprintf(CFG.www_name_back, "Back"); sprintf(CFG.www_icon_prev, "left.gif"); sprintf(CFG.www_name_prev, "Previous page"); sprintf(CFG.www_icon_next, "right.gif"); sprintf(CFG.www_name_next, "Next page"); CFG.www_files_page = 10; if ((fp = fopen(cfgfn, "a+")) == NULL) { perror(""); fprintf(stderr, "Can't create %s\n", cfgfn); exit(2); } fwrite(&CFG, sizeof(CFG), 1, fp); fclose(fp); } else { fread(&CFG, sizeof(CFG), 1, fp); fclose(fp); } cfg_time = file_time(cfgfn); } /* * Load task configuration data. */ void load_taskcfg(void) { FILE *fp; if ((fp = fopen(tcfgfn, "r")) == NULL) { memset(&TCFG, 0, sizeof(TCFG)); TCFG.maxload = 1.50; sprintf(TCFG.zmh_start, "02:30"); sprintf(TCFG.zmh_end, "03:30"); sprintf(TCFG.cmd_mailout, "%s/bin/mbfido scan web -quiet", getenv("MBSE_ROOT")); sprintf(TCFG.cmd_mailin, "%s/bin/mbfido tic toss web -quiet", getenv("MBSE_ROOT")); sprintf(TCFG.cmd_newnews, "%s/bin/mbfido news web -quiet", getenv("MBSE_ROOT")); sprintf(TCFG.cmd_mbindex1, "%s/bin/mbindex -quiet", getenv("MBSE_ROOT")); sprintf(TCFG.cmd_mbindex2, "%s/bin/goldnode -f -q", getenv("MBSE_ROOT")); sprintf(TCFG.cmd_msglink, "%s/bin/mbmsg link -quiet", getenv("MBSE_ROOT")); sprintf(TCFG.cmd_reqindex, "%s/bin/mbfile index -quiet", getenv("MBSE_ROOT")); TCFG.ipblocks = TRUE; TCFG.max_pots = 1; TCFG.max_isdn = 0; TCFG.max_tcp = 0; if ((fp = fopen(tcfgfn, "a+")) == NULL) { tasklog('?', "$Can't create %s", tcfgfn); die(2); } fwrite(&TCFG, sizeof(TCFG), 1, fp); fclose(fp); tasklog('+', "Created new %s", tcfgfn); } else { fread(&TCFG, sizeof(TCFG), 1, fp); fclose(fp); } tcfg_time = file_time(tcfgfn); } /* * Launch an external program in the background. * On success add it to the tasklist and return * the pid. */ pid_t launch(char *cmd, char *opts, char *name, int tasktype) { char buf[PATH_MAX]; char *vector[16]; int i, rc = 0; pid_t pid = 0; if (checktasks(0) >= MAXTASKS) { tasklog('?', "Launch: can't execute %s, maximum tasks reached", cmd); return 0; } if (opts == NULL) sprintf(buf, "%s", cmd); else sprintf(buf, "%s %s", cmd, opts); i = 0; vector[i++] = strtok(buf," \t\n\0"); while ((vector[i++] = strtok(NULL," \t\n")) && (i<16)); vector[15] = NULL; if (file_exist(vector[0], X_OK)) { tasklog('?', "Launch: can't execute %s, command not found", vector[0]); return 0; } pid = fork(); switch (pid) { case -1: tasklog('?', "$Launch: error, can't fork grandchild"); return 0; case 0: /* From Paul Vixies cron: */ (void)setsid(); /* It doesn't seem to help */ close(0); if (open("/dev/null", O_RDONLY) != 0) { tasklog('?', "$Launch: \"%s\": reopen of stdin to /dev/null failed", buf); _exit(-1); } close(1); if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 1) { tasklog('?', "$Launch: \"%s\": reopen of stdout to /dev/null failed", buf); _exit(-1); } close(2); if (open("/dev/null", O_WRONLY | O_APPEND | O_CREAT,0600) != 2) { tasklog('?', "$Launch: \"%s\": reopen of stderr to /dev/null failed", buf); _exit(-1); } errno = 0; rc = execv(vector[0],vector); tasklog('?', "$Launch: execv \"%s\" failed, returned %d", cmd, rc); _exit(-1); default: /* grandchild's daddy's process */ break; } /* * Add it to the tasklist. */ for (i = 0; i < MAXTASKS; i++) { if (strlen(task[i].name) == 0) { strcpy(task[i].name, name); strcpy(task[i].cmd, cmd); if (opts) strcpy(task[i].opts, opts); task[i].pid = pid; task[i].status = 0; task[i].running = TRUE; task[i].rc = 0; task[i].tasktype = tasktype; break; } } if (opts) tasklog('+', "Launch: task %d \"%s %s\" success, pid=%d", i, cmd, opts, pid); else tasklog('+', "Launch: task %d \"%s\" success, pid=%d", i, cmd, pid); return pid; } /* * Count specific running tasks */ int runtasktype(int tasktype) { int i, count = 0; for (i = 0; i < MAXTASKS; i++) { if (strlen(task[i].name) && task[i].running && (task[i].tasktype == tasktype)) count++; } return count; } /* * Check all running tasks registered in the tasklist. * Report programs that are stopped. If signal is set * then send that signal. */ int checktasks(int onsig) { int i, j, rc, count = 0, first = TRUE, status, do_outstat = FALSE; for (i = 0; i < MAXTASKS; i++) { if (strlen(task[i].name)) { if (onsig) { if (kill(task[i].pid, onsig) == 0) tasklog('+', "%s to %s (pid %d) succeeded", SigName[onsig], task[i].name, task[i].pid); else tasklog('+', "%s to %s (pid %d) failed", SigName[onsig], task[i].name, task[i].pid); } task[i].rc = wait4(task[i].pid, &status, WNOHANG | WUNTRACED, NULL); if (task[i].rc) { task[i].running = FALSE; if (task[i].tasktype == CALL_POTS || task[i].tasktype == CALL_ISDN || task[i].tasktype == CALL_IP) do_outstat = TRUE; } if (first && task[i].rc) { first = FALSE; tasklog('t', "Task T pid stat status rc status"); tasklog('t', "---------------- - ----- ---- ----------- ----- --------"); for (j = 0; j < MAXTASKS; j++) if (strlen(task[j].name)) tasklog('t', "%-16s %d %5d %s %-11d %5d %08x", task[j].name, task[j].tasktype, task[j].pid, task[j].running?"runs":"stop", task[j].status, task[j].rc, task[j].status); } switch (task[i].rc) { case -1: if (errno == ECHILD) tasklog('+', "Task %d \"%s\" is ready", i, task[i].name); else tasklog('+', "Task %d \"%s\" is ready, error: %s", i, task[i].name, strerror(errno)); break; case 0: /* * Update last known status when running. */ task[i].status = status; count++; break; default: tasklog('+', "errno=%d %s", errno, strerror(errno)); if (WIFEXITED(task[i].status)) { rc = WEXITSTATUS(task[i].status); if (rc) tasklog('+', "Task %s is ready, error=%d", task[i].name, rc); else tasklog('+', "Task %s is ready", task[i].name); } else if (WIFSIGNALED(task[i].status)) { rc = WTERMSIG(task[i].status); if (rc <= 31) tasklog('+', "Task %s terminated on signal %s (%d)", task[i].name, SigName[rc], rc); else tasklog('+', "Task %s terminated with error nr %d", task[i].name, rc); } else if (WIFSTOPPED(task[i].status)) { rc = WSTOPSIG(task[i].status); tasklog('+', "Task %s stopped on signal %s (%d)", task[i].name, SigName[rc], rc); } else { tasklog('+', "FIXME: 1"); } break; } if (!task[i].running) memset(&task[i], 0, sizeof(onetask)); } } if (do_outstat) outstat(); return count; } void die(int onsig) { int i, count; signal(onsig, SIG_IGN); tasklog('+', "Shutting down on signal %s", SigName[onsig]); /* * First check if there are tasks running, if so try to stop them */ if ((count = checktasks(0))) { tasklog('+', "There are %d tasks running, sending SIGTERM", count); checktasks(SIGTERM); for (i = 0; i < 15; i++) { sleep(1); count = checktasks(0); if (count == 0) break; } if (count) { /* * There are some diehards running... */ tasklog('+', "There are %d tasks running, sending SIGKILL", count); count = checktasks(SIGKILL); } if (count) { sleep(1); count = checktasks(0); if (count) tasklog('?', "Still %d tasks running, giving up", count); } } ulocktask(); if (sock != -1) close(sock); if (ping_isocket != -1) close(ping_isocket); if (!file_exist(spath, R_OK)) { unlink(spath); } tasklog(' ', "MBTASK finished"); exit(onsig); } /* * Put a lock on this program. */ int locktask(char *root) { char Tmpfile[81]; FILE *fp; pid_t oldpid; sprintf(Tmpfile, "%s/var/", root); strcpy(lockfile, Tmpfile); sprintf(Tmpfile + strlen(Tmpfile), "%s%u", TMPNAME, getpid()); sprintf(lockfile + strlen(lockfile), "%s", LCKNAME); if ((fp = fopen(Tmpfile, "w")) == NULL) { perror("mbtask"); printf("Can't create lockfile \"%s\"\n", Tmpfile); return 1; } fprintf(fp, "%10u\n", getpid()); fclose(fp); while (TRUE) { if (link(Tmpfile, lockfile) == 0) { unlink(Tmpfile); return 0; } if ((fp = fopen(lockfile, "r")) == NULL) { perror("mbtask"); printf("Can't open lockfile \"%s\"\n", Tmpfile); unlink(Tmpfile); return 1; } if (fscanf(fp, "%u", &oldpid) != 1) { perror("mbtask"); printf("Can't read old pid from \"%s\"\n", Tmpfile); fclose(fp); unlink(Tmpfile); return 1; } fclose(fp); if (kill(oldpid,0) == -1) { if (errno == ESRCH) { printf("Stale lock found for pid %u\n", oldpid); unlink(lockfile); /* no return, try lock again */ } else { perror("mbtask"); printf("Kill for %u failed\n",oldpid); unlink(Tmpfile); return 1; } } else { printf("Another mbtask is already running, pid=%u\n", oldpid); unlink(Tmpfile); return 1; } } } void ulocktask(void) { if (lockfile) (void)unlink(lockfile); } /* different names, same thing... be careful, as these are macros... */ #ifdef __FreeBSD__ # define icmphdr icmp # define iphdr ip # define ip_saddr ip_src.s_addr # define ip_daddr ip_dst.s_addr #else # define ip_saddr saddr # define ip_daddr daddr # define ip_hl ihl # define ip_p protocol #endif #ifdef __linux__ # define icmp_type type # define icmp_code code # define icmp_cksum checksum # define icmp_id un.echo.id # define icmp_seq un.echo.sequence #endif #ifdef __FreeBSD__ # define ICMP_DEST_UNREACH ICMP_UNREACH # define ICMP_TIME_EXCEEDED ICMP_TIMXCEED #endif #define ICMP_BASEHDR_LEN 8 #define ICMP4_ECHO_LEN ICMP_BASEHDR_LEN /* * Takes a packet as send out and a recieved ICMP packet and looks whether the ICMP packet is * an error reply on the sent-out one. packet is only the packet (without IP header). * errmsg includes an IP header. * to is the destination address of the original packet (the only thing that is actually * compared of the IP header). The RFC sais that we get at least 8 bytes of the offending packet. * We do not compare more, as this is all we need. */ static int icmp4_errcmp(char *packet, int plen, struct in_addr *to, char *errmsg, int elen, int errtype) { struct iphdr iph; struct icmphdr icmph; struct iphdr eiph; char *data; /* XXX: lots of memcpy to avoid unaligned accesses on alpha */ if (elen < sizeof(struct iphdr)) return 0; memcpy(&iph, errmsg, sizeof(iph)); if (iph.ip_p != IPPROTO_ICMP || elen < iph.ip_hl * 4 + ICMP_BASEHDR_LEN + sizeof(eiph)) return 0; memcpy(&icmph, errmsg + iph.ip_hl * 4, ICMP_BASEHDR_LEN); memcpy(&eiph, errmsg + iph.ip_hl * 4 + ICMP_BASEHDR_LEN, sizeof(eiph)); if (elen < iph.ip_hl * 4 + ICMP_BASEHDR_LEN + eiph.ip_hl * 4 + 8) return 0; data = errmsg + iph.ip_hl * 4 + ICMP_BASEHDR_LEN + eiph.ip_hl * 4; return icmph.icmp_type == errtype && memcmp(&to->s_addr, &eiph.ip_daddr, sizeof(to->s_addr)) == 0 && memcmp(data, packet, plen < 8 ?plen:8) == 0; } unsigned short get_rand16(void) { return random()&0xffff; } short p_sequence = 0; unsigned short id; struct icmphdr icmpd; struct sockaddr_in to; /* * IPv4/ICMPv4 ping. Called from ping (see below) */ int ping_send(struct in_addr addr) { int len; int isock; #ifdef __linux__ struct icmp_filter f; #else struct protoent *pe; int SOL_IP; #endif unsigned long sum; unsigned short *ptr; #ifndef __linux__ if (!(pe = getprotobyname("ip"))) { tasklog('?', "icmp ping: getprotobyname() failed: %s", strerror(errno)); return -1; } SOL_IP = pe->p_proto; #endif isock = ping_isocket; p_sequence = 1; id = (unsigned short)get_rand16(); /* randomize a ping id */ #ifdef __linux__ /* Fancy ICMP filering -- only on Linux (as far is I know) */ /* In fact, there should be macros for treating icmp_filter, but I haven't found them in Linux 2.2.15. * So, set it manually and unportable ;-) */ /* This filter lets ECHO_REPLY (0), DEST_UNREACH(3) and TIME_EXCEEDED(11) pass. */ /* !(0000 1000 0000 1001) = 0xff ff f7 f6 */ f.data=0xfffff7f6; if (setsockopt(isock, SOL_RAW, ICMP_FILTER, &f, sizeof(f)) == -1) { if (icmp_errs < ICMP_MAX_ERRS) tasklog('?', "$icmp ping: setsockopt() failed %d", isock); return -1; } #endif icmpd.icmp_type = ICMP_ECHO; icmpd.icmp_code = 0; icmpd.icmp_cksum = 0; icmpd.icmp_id = htons((short)id); icmpd.icmp_seq = htons(p_sequence); /* Checksumming - Algorithm taken from nmap. Thanks... */ ptr = (unsigned short *)&icmpd; sum = 0; for (len = 0; len < 4; len++) { sum += *ptr++; } sum = (sum >> 16) + (sum & 0xffff); sum += (sum >> 16); icmpd.icmp_cksum = ~sum; memset(&to, 0, sizeof(to)); to.sin_family = AF_INET; to.sin_port = 0; to.sin_addr = addr; SET_SOCKA_LEN4(to); if (sendto(isock, &icmpd, ICMP4_ECHO_LEN, 0, (struct sockaddr *)&to, sizeof(to)) == -1) { if (icmp_errs < ICMP_MAX_ERRS) tasklog('?', "$icmp ping: sendto()"); return -2; } return 0; } int ping_receive(struct in_addr addr) { char buf[1024]; int isock; int len; struct sockaddr_in ffrom; struct icmphdr icmpp; struct iphdr iph; socklen_t sl; struct pollfd pfd; isock = ping_isocket; pfd.fd = isock; pfd.events = POLLIN; /* * 10 mSec is enough, this function is called at regular intervals. */ if (poll(&pfd, 1, 10) < 0) { if (icmp_errs < ICMP_MAX_ERRS) tasklog('?', "$poll/select failed"); return -3; } if (pfd.revents & POLLIN || pfd.revents & POLLERR || pfd.revents & POLLHUP || pfd.revents & POLLNVAL) { sl = sizeof(ffrom); if ((len = recvfrom(isock, &buf, sizeof(buf), 0,(struct sockaddr *)&ffrom, &sl)) != -1) { if (len > sizeof(struct iphdr)) { memcpy(&iph, buf, sizeof(iph)); if (len - iph.ip_hl * 4 >= ICMP_BASEHDR_LEN) { memcpy(&icmpp, ((unsigned long int *)buf)+iph.ip_hl, sizeof(icmpp)); if (iph.ip_saddr == addr.s_addr && icmpp.icmp_type == ICMP_ECHOREPLY && ntohs(icmpp.icmp_id) == id && ntohs(icmpp.icmp_seq) <= p_sequence) { return 0; } else { /* No regular echo reply. Maybe an error? */ if (icmp4_errcmp((char *)&icmpd, ICMP4_ECHO_LEN, &to.sin_addr, buf, len, ICMP_DEST_UNREACH) || icmp4_errcmp((char *)&icmpd, ICMP4_ECHO_LEN, &to.sin_addr, buf, len, ICMP_TIME_EXCEEDED)) { return -4; } } } } } else { return -5; /* error */ } } return -6; /* no answer */ } /* * External Semafore Checks */ void test_sema(char *); void test_sema(char *sema) { if (IsSema(sema)) { RemoveSema(sema); tasklog('s', "Semafore %s detected", sema); sem_set(sema, TRUE); } } /* * Check semafore's, system status flags etc. This is called * each second to test for condition changes. */ void check_sema(void); void check_sema(void) { /* * Check UPS status. */ if (IsSema((char *)"upsalarm")) { if (!UPSalarm) tasklog('!', "UPS: power failure"); UPSalarm = TRUE; } else { if (UPSalarm) tasklog('!', "UPS: the power is back"); UPSalarm = FALSE; } if (IsSema((char *)"upsdown")) { tasklog('!', "UPS: power failure, starting shutdown"); /* * Since the upsdown semafore is permanent, the system WILL go down * there is no point for this program to stay. Signal all tasks and stop. */ die(SIGTERM); } /* * Check Zone Mail Hour */ get_zmh(); /* * Semafore's that still can be detected, usefull for * external programs that create them. */ test_sema((char *)"newnews"); test_sema((char *)"mailout"); test_sema((char *)"mailin"); test_sema((char *)"scanout"); } void scheduler(void) { struct passwd *pw; int running = 0, rc, rlen; int LOADhi = FALSE, oldmin = 70, olddo = 70; char *cmd = NULL, doing[32], buf[2048]; time_t now; struct tm *tm; FILE *fp; float lavg1, lavg2, lavg3; struct pollfd pfd; struct in_addr paddr; InitFidonet(); /* * Registrate this server for mbmon in slot 0. */ reginfo[0].pid = getpid(); sprintf(reginfo[0].tty, "-"); sprintf(reginfo[0].uname, "mbse"); sprintf(reginfo[0].prg, "mbtask"); sprintf(reginfo[0].city, "localhost"); sprintf(reginfo[0].doing, "Start"); reginfo[0].started = time(NULL); Processing = TRUE; TouchSema((char *)"mbtask.last"); pw = getpwuid(getuid()); /* * Setup UNIX Datagram socket */ if ((sock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) { tasklog('?', "$Can't create socket"); die(1); } memset(&servaddr, 0, sizeof(servaddr)); servaddr.sun_family = AF_UNIX; strcpy(servaddr.sun_path, spath); if (bind(sock, &servaddr, sizeof(servaddr)) < 0) { close(sock); sock = -1; tasklog('?', "$Can't bind socket %s", spath); die(1); } pingresult[1] = TRUE; pingresult[2] = TRUE; initnl(); sem_set((char *)"scanout", TRUE); do { /* * Poll UNIX Datagram socket until the defined timeout. */ pfd.fd = sock; pfd.events = POLLIN | POLLPRI; pfd.revents = 0; rc = poll(&pfd, 1, 1000); if (rc == -1) { /* * Poll can be interrupted by a finished child so that's not a real error. */ if (errno != EINTR) { tasklog('?', "$poll() rc=%d sock=%d, events=%04x", rc, sock, pfd.revents); } } else if (rc) { if (pfd.revents & POLLIN) { memset(&buf, 0, sizeof(buf)); fromlen = sizeof(from); rlen = recvfrom(sock, buf, sizeof(buf) -1, 0, &from, &fromlen); do_cmd(buf); } else { tasklog('-', "Return poll rc=%d, events=%04x", rc, pfd.revents); } } /* * Check all registered connections and semafore's */ reg_check(); check_sema(); /* * Check the systems load average. */ if ((fp = fopen((char *)"/proc/loadavg", "r"))) { if (fscanf(fp, "%f %f %f", &lavg1, &lavg2, &lavg3) == 3) { Load = lavg1; if (lavg1 >= TCFG.maxload) { if (!LOADhi) { tasklog('!', "System load too high: %2.2f (%2.2f)", lavg1, TCFG.maxload); LOADhi = TRUE; } } else { if (LOADhi) { tasklog('!', "System load normal: %2.2f (%2.2f)", lavg1, TCFG.maxload); LOADhi = FALSE; } } } fclose(fp); } /* * Report to the system monitor. */ memset(&doing, 0, sizeof(doing)); if ((running = checktasks(0))) sprintf(doing, "Run %d tasks", running); else if (UPSalarm) sprintf(doing, "UPS alarm"); else if (!s_bbsopen) sprintf(doing, "BBS is closed"); else if (Processing) sprintf(doing, "Waiting (%d)", oldmin); else sprintf(doing, "Overload %2.2f", lavg1); sprintf(reginfo[0].doing, "%s", doing); reginfo[0].lastcon = time(NULL); /* * Touch the mbtask.last semafore to prove this daemon * is actually running. * Reload configuration data if the file is changed. */ now = time(NULL); tm = localtime(&now); if (tm->tm_min != olddo) { olddo = tm->tm_min; TouchSema((char *)"mbtask.last"); if (file_time(tcfgfn) != tcfg_time) { tasklog('+', "Task configuration changed, reloading"); load_taskcfg(); } if (file_time(cfgfn) != cfg_time) { tasklog('+', "Main configuration changed, reloading"); load_maincfg(); } } if (s_bbsopen && !UPSalarm && !LOADhi) { if (!Processing) { tasklog('+', "Resuming normal operations"); Processing = TRUE; } /* * Here we run all normal operations. */ if (s_mailout && (!runtasktype(MBFIDO))) { launch(TCFG.cmd_mailout, NULL, (char *)"mailout", MBFIDO); running = checktasks(0); s_mailout = FALSE; } if (s_mailin && (!runtasktype(MBFIDO))) { launch(TCFG.cmd_mailin, NULL, (char *)"mailin", MBFIDO); running = checktasks(0); s_mailin = FALSE; } if (s_newnews && (!runtasktype(MBFIDO))) { launch(TCFG.cmd_newnews, NULL, (char *)"newnews", MBFIDO); running = checktasks(0); s_newnews = FALSE; } /* * Only run the nodelist compiler if nothing else * is running. There's no hurry to compile the * new lists. If more then one compiler is defined, * start them in parallel. */ if (s_index && (!running)) { if (strlen(TCFG.cmd_mbindex1)) launch(TCFG.cmd_mbindex1, NULL, (char *)"compiler 1", MBINDEX); if (strlen(TCFG.cmd_mbindex2)) launch(TCFG.cmd_mbindex2, NULL, (char *)"compiler 2", MBINDEX); if (strlen(TCFG.cmd_mbindex3)) launch(TCFG.cmd_mbindex3, NULL, (char *)"compiler 3", MBINDEX); running = checktasks(0); s_index = FALSE; } /* * Linking messages is also only done when there is * nothing else to do. */ if (s_msglink && (!running)) { launch(TCFG.cmd_msglink, NULL, (char *)"msglink", MBFIDO); running = checktasks(0); s_msglink = FALSE; } /* * Creating filerequest indexes. */ if (s_reqindex && (!running)) { launch(TCFG.cmd_reqindex, NULL, (char *)"reqindex", MBFILE); running = checktasks(0); s_reqindex = FALSE; } if ((tm->tm_sec / SLOWRUN) != oldmin) { /* * These tasks run once per 20 seconds. */ oldmin = tm->tm_sec / SLOWRUN; /* * If the previous pingstat is still P_SENT, the we now consider it a timeout. */ if (pingstate == P_SENT) { pingresult[pingnr] = FALSE; icmp_errs++; if (icmp_errs < ICMP_MAX_ERRS) tasklog('p', "ping %s seq=%d timeout", pingaddress, p_sequence); } /* * Check internet connection with ICMP ping */ rc = 0; if (pingnr == 1) { pingnr = 2; if (strlen(TCFG.isp_ping2)) { sprintf(pingaddress, "%s", TCFG.isp_ping2); } else { pingstate = P_NONE; } } else { pingnr = 1; if (strlen(TCFG.isp_ping1)) { sprintf(pingaddress, "%s", TCFG.isp_ping1); } else { pingstate = P_NONE; } } if (inet_aton(pingaddress, &paddr)) { rc = ping_send(paddr); if (rc) { if (icmp_errs++ < ICMP_MAX_ERRS) tasklog('?', "ping send %s rc=%d", pingaddress, rc); pingstate = P_FAIL; pingresult[pingnr] = FALSE; } else { pingstate = P_SENT; } } else { if (icmp_errs++ < ICMP_MAX_ERRS) tasklog('?', "Ping address %d is invalid \"%s\"", pingnr, pingaddress); pingstate = P_NONE; } if (pingresult[1] == FALSE && pingresult[2] == FALSE) { icmp_errs++; if (internet) { tasklog('!', "Internet connection is down"); internet = FALSE; } } else { if (!internet) { tasklog('!', "Internet connection is up"); internet = TRUE; } icmp_errs = 0; } /* * Run the mailer if something to do. For now we run just * one task and lock it with CALL_POTS. * Later tasks for different calltypes should run parallel. */ if (s_scanout && !runtasktype(CALL_POTS)) { cmd = xstrcpy(pw->pw_dir); cmd = xstrcat(cmd, (char *)"/bin/mbcico"); launch(cmd, (char *)"-r1", (char *)"mbcico", CALL_POTS); running = checktasks(0); free(cmd); cmd = NULL; } } switch (pingstate) { case P_NONE: pingresult[pingnr] = TRUE; break; case P_SENT: rc = ping_receive(paddr); if (!rc) { pingstate = P_OK; pingresult[pingnr] = TRUE; } else { if (rc != -6) tasklog('p', "ping recv %s id=%d rc=%d", pingaddress, id, rc); } break; } } else { if (Processing) { tasklog('+', "Suspending operations"); Processing = FALSE; } } } while (TRUE); } int main(int argc, char **argv) { struct passwd *pw; int i; pid_t frk; FILE *fp; /* * Print copyright notices and setup logging. */ printf("MBTASK: MBSE BBS v%s Task Manager Daemon\n", VERSION); printf(" %s\n\n", Copyright); /* * Catch all the signals we can, and ignore the rest. Note that SIGKILL can't be ignored * but that's live. This daemon should only be stopped by SIGTERM. */ for(i = 0; i < NSIG; i++) { if ((i == SIGHUP) || (i == SIGINT) || (i == SIGBUS) || (i == SIGILL) || (i == SIGSEGV) || (i == SIGTERM)) signal(i, (void (*))die); else signal(i, SIG_IGN); } /* * Create the ping socket while we are still root. */ if ((ping_isocket = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) == -1) { perror(""); printf("socket init failed, is mbtask not installed setuid root?\n"); exit(1); } /* * mbtask is setuid root, drop privileges to user mbse. * This will stay forever like this, no need to become * root again. The child can't even become root anymore. */ pw = getpwnam((char *)"mbse"); if (setuid(pw->pw_uid)) { perror(""); printf("can't setuid to mbse\n"); close(ping_isocket); exit(1); } if (setgid(pw->pw_gid)) { perror(""); printf("can't setgid to bbs\n"); close(ping_isocket); exit(1); } umask(007); if (locktask(pw->pw_dir)) { close(ping_isocket); exit(1); } sprintf(cfgfn, "%s/etc/config.data", getenv("MBSE_ROOT")); load_maincfg(); tasklog(' ', " "); tasklog(' ', "MBTASK v%s", VERSION); sprintf(tcfgfn, "%s/etc/task.data", getenv("MBSE_ROOT")); load_taskcfg(); status_init(); memset(&task, 0, sizeof(task)); memset(®info, 0, sizeof(reginfo)); sprintf(spath, "%s/tmp/mbtask", getenv("MBSE_ROOT")); /* * Now that init is complete and this program is locked, it is * safe to remove a stale socket if it is there after a crash. */ if (!file_exist(spath, R_OK)) unlink(spath); /* * Server initialization is complete. Now we can fork the * daemon and return to the user. We need to do a setpgrp * so that the daemon will no longer be assosiated with the * users control terminal. This is done before the fork, so * that the child will not be a process group leader. Otherwise, * if the child were to open a terminal, it would become * associated with that terminal as its control terminal. */ if ((pgrp = setpgid(0, 0)) == -1) { tasklog('?', "$setpgid failed"); die(0); } frk = fork(); switch (frk) { case -1: tasklog('?', "$Unable to fork daemon"); die(0); case 0: /* * Starting the deamon child process here. */ fclose(stdin); fclose(stdout); fclose(stderr); scheduler(); /* Not reached */ default: /* * Here we detach this process and let the child * run the deamon process. Put the child's pid * in the lockfile before leaving. */ if ((fp = fopen(lockfile, "w"))) { fprintf(fp, "%10u\n", frk); fclose(fp); } tasklog('+', "Starting daemon with pid %d", frk); exit(0); } /* * Not reached */ return 0; }