Index: head/usr.sbin/syslogd/syslogd.8 =================================================================== --- head/usr.sbin/syslogd/syslogd.8 (revision 63996) +++ head/usr.sbin/syslogd/syslogd.8 (revision 63997) @@ -1,247 +1,247 @@ .\" Copyright (c) 1983, 1986, 1991, 1993 .\" The Regents of the University of California. 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. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. .\" .\" @(#)syslogd.8 8.1 (Berkeley) 6/6/93 .\" $FreeBSD$ .\" .Dd October 12, 1995 .Dt SYSLOGD 8 .Os BSD 4.2 .Sh NAME .Nm syslogd .Nd log systems messages .Sh SYNOPSIS .Nm .Op Fl dsuv .Op Fl a Ar allowed_peer .Op Fl f Ar config_file .Op Fl m Ar mark_interval .Op Fl p Ar log_socket .Op Fl l Ar path .Sh DESCRIPTION The .Nm daemon reads and logs messages to the system console, log files, other machines and/or users as specified by its configuration file. .Pp The options are as follows: .Bl -tag -width indent .It Fl a Ar allowed_peer Allow .Ar allowed_peer to log to this .Nm using UDP datagrams. Multiple .Fl a options may be specified. .Pp .Ar Allowed_peer can be any of the following: .Bl -tag -width "ipaddr/masklen[:service]XX" .It Ar ipaddr/masklen Ns Op Ar :service Accept datagrams from .Ar ipaddr (in the usual dotted quad notation) with .Ar masklen bits being taken into account when doing the address comparision. If specified, .Ar service is the name or number of an UDP service (see .Xr services 5 ) Ns the source packet must belong to. A .Ar service of .Ql \&* allows packets being sent from any UDP port. The default .Ar service is .Ql syslog . A missing .Ar masklen will be substituted by the historic class A or class B netmasks if .Ar ipaddr belongs into the address range of class A or B, respectively, or by 24 otherwise. .It Ar domainname Ns Op Ar :service Accept datagrams where the reverse address lookup yields .Ar domainname for the sender address. The meaning of .Ar service is as explained above. .It Ar *domainname Ns Op Ar :service Same as before, except that any source host whose name .Em ends in .Ar domainname will get permission. .El .It Fl d Put .Nm into debugging mode. This is probably only of use to developers working on .Nm Ns . .It Fl f Specify the pathname of an alternate configuration file; the default is .Pa /etc/syslog.conf . .It Fl m Select the number of minutes between .Dq mark messages; the default is 20 minutes. +.It Fl n +Disable dns query for every request. .It Fl p Specify the pathname of an alternate log socket to be used instead; the default is .Pa /var/run/log . -.It Fl r -Disable dns query for every request. .It Fl l Specify a location where .Nm should place an additional log socket. Up to 19 additional logging sockets can be specified. The primary use for this is to place additional log sockets in .Pa /var/run/log of various chroot filespaces. .It Fl s Operate in secure mode. Do not log messages from remote machines. If specified twice, no network socket will be opened at all, which also disables logging to remote machines. .It Fl u Unique priority logging. Only log messages at the specified priority. Without this option, messages at the stated priority or higher are logged. This option changes the default comparison from .Dq => to .Dq = . .It Fl v Verbose logging. If specified once, the numeric facility and priority are logged with each locally-written message. If specified more than once, the names of the facility and priority are logged with each locally-written message. .El .Pp The .Nm daemon reads its configuration file when it starts up and whenever it receives a hangup signal. For information on the format of the configuration file, see .Xr syslog.conf 5 . .Pp The .Nm daemon reads messages from the .Tn UNIX domain socket .Pa /var/run/log , from an Internet domain socket specified in .Pa /etc/services , and from the special device .Pa /dev/klog (to read kernel messages). .Pp The .Nm daemon creates the file .Pa /var/run/syslog.pid , and stores its process id there. This can be used to kill or reconfigure .Nm Ns . .Pp The message sent to .Nm should consist of a single line. The message can contain a priority code, which should be a preceding decimal number in angle braces, for example, .Sq Aq 5. This priority code should map into the priorities defined in the include file .Aq Pa sys/syslog.h . .Sh FILES .Bl -tag -width /var/run/syslog.pid -compact .It Pa /etc/syslog.conf configuration file .It Pa /var/run/syslog.pid process id of current .Nm .It Pa /var/run/log name of the .Tn UNIX domain datagram log socket .It Pa /dev/klog kernel log device .El .Sh SEE ALSO .Xr logger 1 , .Xr syslog 3 , .Xr services 5 , .Xr syslog.conf 5 .Sh HISTORY The .Nm command appeared in .Bx 4.3 . .Pp The .Fl a , .Fl s , .Fl u , and .Fl v options are .Fx 2.2 extensions. .Sh BUGS The ability to log messages received in UDP packets is equivalent to an unauthenticated remote disk-filling service, and should probably be disabled by default. Some sort of .No inter- Ns Nm syslogd authentication mechanism ought to be worked out. To prevent the worst abuse, use of the .Fl a option is therefore highly recommended. .Pp The .Fl a matching algorithm doesn't pretend to be very efficient; use of numeric IP addresses is faster than domain name comparision. Since the allowed peer list is being walked linearly, peer groups where frequent messages are being anticipated from should be put early into the .Fl a list. .Pp The log socket was moved from .Pa /dev to ease the use of a read-only root filesystem. This may confuse some old binaries so that a symbolic link might be used for a transitional period. Index: head/usr.sbin/syslogd/syslogd.c =================================================================== --- head/usr.sbin/syslogd/syslogd.c (revision 63996) +++ head/usr.sbin/syslogd/syslogd.c (revision 63997) @@ -1,2048 +1,2048 @@ /* * Copyright (c) 1983, 1988, 1993, 1994 * The Regents of the University of California. 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 copyright[] = "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; #endif static const char rcsid[] = "$FreeBSD$"; #endif /* not lint */ /* * syslogd -- log system messages * * This program implements a system log. It takes a series of lines. * Each line may have a priority, signified as "" as * the first characters of the line. If this is * not present, a default priority is used. * * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will * cause it to reread its configuration file. * * Defined Constants: * * MAXLINE -- the maximimum line length that can be handled. * DEFUPRI -- the default priority for user messages * DEFSPRI -- the default priority for kernel messages * * Author: Eric Allman * extensive changes by Ralph Campbell * more extensive changes by Eric Allman (again) * Extension to log by program name as well as facility and priority * by Peter da Silva. * -u and -v by Harlan Stenn. * Priority comparison code by Harlan Stenn. */ #define MAXLINE 1024 /* maximum line length */ #define MAXSVLINE 120 /* maximum saved line length */ #define DEFUPRI (LOG_USER|LOG_NOTICE) #define DEFSPRI (LOG_KERN|LOG_CRIT) #define TIMERINTVL 30 /* interval for checking flush, mark */ #define TTYMSGTIME 1 /* timed out passed to ttymsg */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" #define SYSLOG_NAMES #include const char *ConfFile = _PATH_LOGCONF; const char *PidFile = _PATH_LOGPID; const char ctty[] = _PATH_CONSOLE; #define dprintf if (Debug) printf #define MAXUNAMES 20 /* maximum number of user names */ #define MAXFUNIX 20 int nfunix = 1; char *funixn[MAXFUNIX] = { _PATH_LOG }; int funix[MAXFUNIX]; /* * Flags to logmsg(). */ #define IGN_CONS 0x001 /* don't print on console */ #define SYNC_FILE 0x002 /* do fsync on file after printing */ #define ADDDATE 0x004 /* add a date to the message */ #define MARK 0x008 /* this message is a mark */ #define ISKERNEL 0x010 /* kernel generated message */ /* * This structure represents the files that will have log * copies printed. */ struct filed { struct filed *f_next; /* next in linked list */ short f_type; /* entry type, see below */ short f_file; /* file descriptor */ time_t f_time; /* time this was last written */ char *f_host; /* host from which to recd. */ u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ #define PRI_LT 0x1 #define PRI_EQ 0x2 #define PRI_GT 0x4 char *f_program; /* program this applies to */ union { char f_uname[MAXUNAMES][UT_NAMESIZE+1]; struct { char f_hname[MAXHOSTNAMELEN+1]; struct sockaddr_in f_addr; } f_forw; /* forwarding address */ char f_fname[MAXPATHLEN]; struct { char f_pname[MAXPATHLEN]; pid_t f_pid; } f_pipe; } f_un; char f_prevline[MAXSVLINE]; /* last message logged */ char f_lasttime[16]; /* time of last occurrence */ char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ int f_prevpri; /* pri of f_prevline */ int f_prevlen; /* length of f_prevline */ int f_prevcount; /* repetition cnt of prevline */ int f_repeatcount; /* number of "repeated" msgs */ }; /* * Queue of about-to-be dead processes we should watch out for. */ TAILQ_HEAD(stailhead, deadq_entry) deadq_head; struct stailhead *deadq_headp; struct deadq_entry { pid_t dq_pid; int dq_timeout; TAILQ_ENTRY(deadq_entry) dq_entries; }; /* * The timeout to apply to processes waiting on the dead queue. Unit * of measure is `mark intervals', i.e. 20 minutes by default. * Processes on the dead queue will be terminated after that time. */ #define DQ_TIMO_INIT 2 typedef struct deadq_entry *dq_t; /* * Struct to hold records of network addresses that are allowed to log * to us. */ struct allowedpeer { int isnumeric; u_short port; union { struct { struct in_addr addr; struct in_addr mask; } numeric; char *name; } u; #define a_addr u.numeric.addr #define a_mask u.numeric.mask #define a_name u.name }; /* * Intervals at which we flush out "message repeated" messages, * in seconds after previous message is logged. After each flush, * we move to the next interval until we reach the largest. */ int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ (f)->f_repeatcount = MAXREPEAT; \ } /* values for f_type */ #define F_UNUSED 0 /* unused entry */ #define F_FILE 1 /* regular file */ #define F_TTY 2 /* terminal */ #define F_CONSOLE 3 /* console terminal */ #define F_FORW 4 /* remote machine */ #define F_USERS 5 /* list of users */ #define F_WALL 6 /* everyone logged on */ #define F_PIPE 7 /* pipe to program */ char *TypeNames[8] = { "UNUSED", "FILE", "TTY", "CONSOLE", "FORW", "USERS", "WALL", "PIPE" }; struct filed *Files; struct filed consfile; int Debug; /* debug flag */ int resolve = 1; /* resolve hostname */ char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ char *LocalDomain; /* our local domain name */ int finet = -1; /* Internet datagram socket */ int fklog = -1; /* /dev/klog */ int LogPort; /* port number for INET connections */ int Initialized = 0; /* set when we have initialized ourselves */ int MarkInterval = 20 * 60; /* interval between marks in seconds */ int MarkSeq = 0; /* mark sequence number */ int SecureMode = 0; /* when true, receive only unix domain socks */ char bootfile[MAXLINE+1]; /* booted kernel file */ struct allowedpeer *AllowedPeers; int NumAllowed = 0; /* # of AllowedPeer entries */ int UniquePriority = 0; /* Only log specified priority? */ int LogFacPri = 0; /* Put facility and priority in log message: */ /* 0=no, 1=numeric, 2=names */ int allowaddr __P((char *)); void cfline __P((char *, struct filed *, char *, char *)); char *cvthname __P((struct sockaddr_in *)); void deadq_enter __P((pid_t, const char *)); int deadq_remove __P((pid_t)); int decode __P((const char *, CODE *)); void die __P((int)); void domark __P((int)); void fprintlog __P((struct filed *, int, char *)); void init __P((int)); void logerror __P((const char *)); void logmsg __P((int, char *, char *, int)); void log_deadchild __P((pid_t, int, const char *)); void printline __P((char *, char *)); void printsys __P((char *)); int p_open __P((char *, pid_t *)); void readklog __P((void)); void reapchild __P((int)); char *ttymsg __P((struct iovec *, int, char *, int)); static void usage __P((void)); int validate __P((struct sockaddr_in *, const char *)); void wallmsg __P((struct filed *, struct iovec *)); int waitdaemon __P((int, int, int)); void timedout __P((int)); int main(argc, argv) int argc; char *argv[]; { int ch, i, l; struct sockaddr_un sunx, fromunix; struct sockaddr_in sin, frominet; FILE *fp; char *p, *hname, line[MAXLINE + 1]; struct timeval tv, *tvp; struct sigaction sact; sigset_t mask; pid_t ppid = 1; socklen_t len; while ((ch = getopt(argc, argv, "a:dl:f:m:p:rsuv")) != -1) switch(ch) { case 'd': /* debug */ Debug++; break; case 'a': /* allow specific network addresses only */ if (allowaddr(optarg) == -1) usage(); break; case 'f': /* configuration file */ ConfFile = optarg; break; case 'm': /* mark interval */ MarkInterval = atoi(optarg) * 60; break; + case 'n': + resolve = 0; + break; case 'p': /* path */ funixn[0] = optarg; - break; - case 'r': - resolve = 0; break; case 's': /* no network mode */ SecureMode++; break; case 'l': if (nfunix < MAXFUNIX) funixn[nfunix++] = optarg; else warnx("out of descriptors, ignoring %s", optarg); break; case 'u': /* only log specified priority */ UniquePriority++; break; case 'v': /* log facility and priority */ LogFacPri++; break; case '?': default: usage(); } if ((argc -= optind) != 0) usage(); if (!Debug) { ppid = waitdaemon(0, 0, 30); if (ppid < 0) err(1, "could not become daemon"); } else setlinebuf(stdout); if (NumAllowed) endservent(); consfile.f_type = F_CONSOLE; (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); (void)gethostname(LocalHostName, sizeof(LocalHostName)); if ((p = strchr(LocalHostName, '.')) != NULL) { *p++ = '\0'; LocalDomain = p; } else LocalDomain = ""; (void)strcpy(bootfile, getbootfile()); (void)signal(SIGTERM, die); (void)signal(SIGINT, Debug ? die : SIG_IGN); (void)signal(SIGQUIT, Debug ? die : SIG_IGN); /* * We don't want the SIGCHLD and SIGHUP handlers to interfere * with each other; they are likely candidates for being called * simultaneously (SIGHUP closes pipe descriptor, process dies, * SIGCHLD happens). */ sigemptyset(&mask); sigaddset(&mask, SIGHUP); sact.sa_handler = reapchild; sact.sa_mask = mask; sact.sa_flags = SA_RESTART; (void)sigaction(SIGCHLD, &sact, NULL); (void)signal(SIGALRM, domark); (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ (void)alarm(TIMERINTVL); TAILQ_INIT(&deadq_head); #ifndef SUN_LEN #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) #endif for (i = 0; i < nfunix; i++) { memset(&sunx, 0, sizeof(sunx)); sunx.sun_family = AF_UNIX; (void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); if (funix[i] < 0 || bind(funix[i], (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || chmod(funixn[i], 0666) < 0) { (void) snprintf(line, sizeof line, "cannot create %s", funixn[i]); logerror(line); dprintf("cannot create %s (%d)\n", funixn[i], errno); if (i == 0) die(0); } } if (SecureMode <= 1) finet = socket(AF_INET, SOCK_DGRAM, 0); if (finet >= 0) { struct servent *sp; sp = getservbyname("syslog", "udp"); if (sp == NULL) { errno = 0; logerror("syslog/udp: unknown service"); die(0); } memset(&sin, 0, sizeof(sin)); sin.sin_family = AF_INET; sin.sin_port = LogPort = sp->s_port; if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { logerror("bind"); if (!Debug) die(0); } } if (finet >= 0 && SecureMode) { if (shutdown(finet, SHUT_RD) < 0) { logerror("shutdown"); if (!Debug) die(0); } } if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) fklog = -1; if (fklog < 0) dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); /* tuck my process id away */ fp = fopen(PidFile, "w"); if (fp != NULL) { fprintf(fp, "%d\n", getpid()); (void) fclose(fp); } dprintf("off & running....\n"); init(0); /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ sigemptyset(&mask); sigaddset(&mask, SIGCHLD); sact.sa_handler = init; sact.sa_mask = mask; sact.sa_flags = SA_RESTART; (void)sigaction(SIGHUP, &sact, NULL); tvp = &tv; tv.tv_sec = tv.tv_usec = 0; for (;;) { fd_set readfds; int nfds = 0; FD_ZERO(&readfds); if (fklog != -1) { FD_SET(fklog, &readfds); if (fklog > nfds) nfds = fklog; } if (finet != -1 && !SecureMode) { FD_SET(finet, &readfds); if (finet > nfds) nfds = finet; } for (i = 0; i < nfunix; i++) { if (funix[i] != -1) { FD_SET(funix[i], &readfds); if (funix[i] > nfds) nfds = funix[i]; } } /*dprintf("readfds = %#x\n", readfds);*/ nfds = select(nfds+1, &readfds, (fd_set *)NULL, (fd_set *)NULL, tvp); if (nfds == 0) { if (tvp) { tvp = NULL; if (ppid != 1) kill(ppid, SIGALRM); } continue; } if (nfds < 0) { if (errno != EINTR) logerror("select"); continue; } /*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/ if (fklog != -1 && FD_ISSET(fklog, &readfds)) readklog(); if (finet != -1 && FD_ISSET(finet, &readfds)) { len = sizeof(frominet); l = recvfrom(finet, line, MAXLINE, 0, (struct sockaddr *)&frominet, &len); if (l > 0) { line[l] = '\0'; if (resolve) hname = cvthname(&frominet); else hname = inet_ntoa(frominet.sin_addr); if (validate(&frominet, hname)) printline(hname, line); } else if (l < 0 && errno != EINTR) logerror("recvfrom inet"); } for (i = 0; i < nfunix; i++) { if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { len = sizeof(fromunix); l = recvfrom(funix[i], line, MAXLINE, 0, (struct sockaddr *)&fromunix, &len); if (l > 0) { line[l] = '\0'; printline(LocalHostName, line); } else if (l < 0 && errno != EINTR) logerror("recvfrom unix"); } } } } static void usage() { fprintf(stderr, "%s\n%s\n%s\n", "usage: syslogd [-drsuv] [-a allowed_peer] [-f config_file]", " [-m mark_interval] [-p log_socket]", " [-l log_socket]"); exit(1); } /* * Take a raw input line, decode the message, and print the message * on the appropriate log files. */ void printline(hname, msg) char *hname; char *msg; { int c, pri; char *p, *q, line[MAXLINE + 1]; /* test for special codes */ pri = DEFUPRI; p = msg; if (*p == '<') { pri = 0; while (isdigit(*++p)) pri = 10 * pri + (*p - '0'); if (*p == '>') ++p; } if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) pri = DEFUPRI; /* don't allow users to log kernel messages */ if (LOG_FAC(pri) == LOG_KERN) pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); q = line; while ((c = (unsigned char)*p++) != '\0' && q < &line[sizeof(line) - 3]) { if ((c & 0x80) && c < 0xA0) { c &= 0x7F; *q++ = 'M'; *q++ = '-'; } if (isascii(c) && iscntrl(c)) { if (c == '\n') *q++ = ' '; else if (c == '\t') *q++ = '\t'; else { *q++ = '^'; *q++ = c ^ 0100; } } else *q++ = c; } *q = '\0'; logmsg(pri, line, hname, 0); } /* * Read /dev/klog while data are available, split into lines. */ void readklog() { char *p, *q, line[MAXLINE + 1]; int len, i; len = 0; for (;;) { i = read(fklog, line + len, MAXLINE - 1 - len); if (i > 0) line[i + len] = '\0'; else if (i < 0 && errno != EINTR && errno != EAGAIN) { logerror("klog"); fklog = -1; break; } else break; for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { *q = '\0'; printsys(p); } len = strlen(p); if (len >= MAXLINE - 1) { printsys(p); len = 0; } if (len > 0) memmove(line, p, len + 1); } if (len > 0) printsys(line); } /* * Take a raw input line from /dev/klog, format similar to syslog(). */ void printsys(p) char *p; { int pri, flags; flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ pri = DEFSPRI; if (*p == '<') { pri = 0; while (isdigit(*++p)) pri = 10 * pri + (*p - '0'); if (*p == '>') ++p; } else { /* kernel printf's come out on console */ flags |= IGN_CONS; } if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) pri = DEFSPRI; logmsg(pri, p, LocalHostName, flags); } time_t now; /* * Log a message to the appropriate log files, users, etc. based on * the priority. */ void logmsg(pri, msg, from, flags) int pri; char *msg, *from; int flags; { struct filed *f; int i, fac, msglen, omask, prilev; char *timestamp; char prog[NAME_MAX+1]; char buf[MAXLINE+1]; dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", pri, flags, from, msg); omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); /* * Check to see if msg looks non-standard. */ msglen = strlen(msg); if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') flags |= ADDDATE; (void)time(&now); if (flags & ADDDATE) timestamp = ctime(&now) + 4; else { timestamp = msg; msg += 16; msglen -= 16; } /* skip leading blanks */ while(isspace(*msg)) { msg++; msglen--; } /* extract facility and priority level */ if (flags & MARK) fac = LOG_NFACILITIES; else fac = LOG_FAC(pri); prilev = LOG_PRI(pri); /* extract program name */ for(i = 0; i < NAME_MAX; i++) { if(!isalnum(msg[i])) break; prog[i] = msg[i]; } prog[i] = 0; /* add kernel prefix for kernel messages */ if (flags & ISKERNEL) { snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); msg = buf; msglen = strlen(buf); } /* log the message to the particular outputs */ if (!Initialized) { f = &consfile; f->f_file = open(ctty, O_WRONLY, 0); if (f->f_file >= 0) { fprintlog(f, flags, msg); (void)close(f->f_file); } (void)sigsetmask(omask); return; } for (f = Files; f; f = f->f_next) { /* skip messages that are incorrect priority */ if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) ) || f->f_pmask[fac] == INTERNAL_NOPRI) continue; /* skip messages with the incorrect hostname */ if (f->f_host) switch (f->f_host[0]) { case '+': if((strcmp(from, f->f_host + 1) != 0) ) continue; break; case '-': if((strcmp(from, f->f_host + 1) == 0) ) continue; break; } /* skip messages with the incorrect program name */ if(f->f_program) if(strcmp(prog, f->f_program) != 0) continue; if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) continue; /* don't output marks to recently written files */ if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) continue; /* * suppress duplicate lines to this file */ if ((flags & MARK) == 0 && msglen == f->f_prevlen && !strcmp(msg, f->f_prevline) && !strcasecmp(from, f->f_prevhost)) { (void)strncpy(f->f_lasttime, timestamp, 15); f->f_prevcount++; dprintf("msg repeated %d times, %ld sec of %d\n", f->f_prevcount, (long)(now - f->f_time), repeatinterval[f->f_repeatcount]); /* * If domark would have logged this by now, * flush it now (so we don't hold isolated messages), * but back off so we'll flush less often * in the future. */ if (now > REPEATTIME(f)) { fprintlog(f, flags, (char *)NULL); BACKOFF(f); } } else { /* new line, save it */ if (f->f_prevcount) fprintlog(f, 0, (char *)NULL); f->f_repeatcount = 0; f->f_prevpri = pri; (void)strncpy(f->f_lasttime, timestamp, 15); (void)strncpy(f->f_prevhost, from, sizeof(f->f_prevhost)-1); f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0'; if (msglen < MAXSVLINE) { f->f_prevlen = msglen; (void)strcpy(f->f_prevline, msg); fprintlog(f, flags, (char *)NULL); } else { f->f_prevline[0] = 0; f->f_prevlen = 0; fprintlog(f, flags, msg); } } } (void)sigsetmask(omask); } void fprintlog(f, flags, msg) struct filed *f; int flags; char *msg; { struct iovec iov[7]; struct iovec *v; int l; char line[MAXLINE + 1], repbuf[80], greetings[200]; char *msgret; v = iov; if (f->f_type == F_WALL) { v->iov_base = greetings; v->iov_len = snprintf(greetings, sizeof greetings, "\r\n\7Message from syslogd@%s at %.24s ...\r\n", f->f_prevhost, ctime(&now)); v++; v->iov_base = ""; v->iov_len = 0; v++; } else { v->iov_base = f->f_lasttime; v->iov_len = 15; v++; v->iov_base = " "; v->iov_len = 1; v++; } if (LogFacPri) { static char fp_buf[30]; /* Hollow laugh */ int fac = f->f_prevpri & LOG_FACMASK; int pri = LOG_PRI(f->f_prevpri); char *f_s = 0; char f_n[5]; /* Hollow laugh */ char *p_s = 0; char p_n[5]; /* Hollow laugh */ if (LogFacPri > 1) { CODE *c; for (c = facilitynames; c->c_name; c++) { if (c->c_val == fac) { f_s = c->c_name; break; } } for (c = prioritynames; c->c_name; c++) { if (c->c_val == pri) { p_s = c->c_name; break; } } } if (!f_s) { snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); f_s = f_n; } if (!p_s) { snprintf(p_n, sizeof p_n, "%d", pri); p_s = p_n; } snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); v->iov_base = fp_buf; v->iov_len = strlen(fp_buf); } else { v->iov_base=""; v->iov_len = 0; } v++; v->iov_base = f->f_prevhost; v->iov_len = strlen(v->iov_base); v++; v->iov_base = " "; v->iov_len = 1; v++; if (msg) { v->iov_base = msg; v->iov_len = strlen(msg); } else if (f->f_prevcount > 1) { v->iov_base = repbuf; v->iov_len = sprintf(repbuf, "last message repeated %d times", f->f_prevcount); } else { v->iov_base = f->f_prevline; v->iov_len = f->f_prevlen; } v++; dprintf("Logging to %s", TypeNames[f->f_type]); f->f_time = now; switch (f->f_type) { case F_UNUSED: dprintf("\n"); break; case F_FORW: dprintf(" %s\n", f->f_un.f_forw.f_hname); /* check for local vs remote messages */ if (strcasecmp(f->f_prevhost, LocalHostName)) l = snprintf(line, sizeof line - 1, "<%d>%.15s Forwarded from %s: %s", f->f_prevpri, iov[0].iov_base, f->f_prevhost, iov[5].iov_base); else l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", f->f_prevpri, iov[0].iov_base, iov[5].iov_base); if (l > MAXLINE) l = MAXLINE; if ((finet >= 0) && (sendto(finet, line, l, 0, (struct sockaddr *)&f->f_un.f_forw.f_addr, sizeof(f->f_un.f_forw.f_addr)) != l)) { int e = errno; (void)close(f->f_file); f->f_type = F_UNUSED; errno = e; logerror("sendto"); } break; case F_FILE: dprintf(" %s\n", f->f_un.f_fname); v->iov_base = "\n"; v->iov_len = 1; if (writev(f->f_file, iov, 7) < 0) { int e = errno; (void)close(f->f_file); f->f_type = F_UNUSED; errno = e; logerror(f->f_un.f_fname); } else if (flags & SYNC_FILE) (void)fsync(f->f_file); break; case F_PIPE: dprintf(" %s\n", f->f_un.f_pipe.f_pname); v->iov_base = "\n"; v->iov_len = 1; if (f->f_un.f_pipe.f_pid == 0) { if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, &f->f_un.f_pipe.f_pid)) < 0) { f->f_type = F_UNUSED; logerror(f->f_un.f_pipe.f_pname); break; } } if (writev(f->f_file, iov, 7) < 0) { int e = errno; (void)close(f->f_file); if (f->f_un.f_pipe.f_pid > 0) deadq_enter(f->f_un.f_pipe.f_pid, f->f_un.f_pipe.f_pname); f->f_un.f_pipe.f_pid = 0; errno = e; logerror(f->f_un.f_pipe.f_pname); } break; case F_CONSOLE: if (flags & IGN_CONS) { dprintf(" (ignored)\n"); break; } /* FALLTHROUGH */ case F_TTY: dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); v->iov_base = "\r\n"; v->iov_len = 2; errno = 0; /* ttymsg() only sometimes returns an errno */ if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { f->f_type = F_UNUSED; logerror(msgret); } break; case F_USERS: case F_WALL: dprintf("\n"); v->iov_base = "\r\n"; v->iov_len = 2; wallmsg(f, iov); break; } f->f_prevcount = 0; } /* * WALLMSG -- Write a message to the world at large * * Write the specified message to either the entire * world, or a list of approved users. */ void wallmsg(f, iov) struct filed *f; struct iovec *iov; { static int reenter; /* avoid calling ourselves */ FILE *uf; struct utmp ut; int i; char *p; char line[sizeof(ut.ut_line) + 1]; if (reenter++) return; if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { logerror(_PATH_UTMP); reenter = 0; return; } /* NOSTRICT */ while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { if (ut.ut_name[0] == '\0') continue; strncpy(line, ut.ut_line, sizeof(ut.ut_line)); line[sizeof(ut.ut_line)] = '\0'; if (f->f_type == F_WALL) { if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { errno = 0; /* already in msg */ logerror(p); } continue; } /* should we send the message to this user? */ for (i = 0; i < MAXUNAMES; i++) { if (!f->f_un.f_uname[i][0]) break; if (!strncmp(f->f_un.f_uname[i], ut.ut_name, UT_NAMESIZE)) { if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { errno = 0; /* already in msg */ logerror(p); } break; } } } (void)fclose(uf); reenter = 0; } void reapchild(signo) int signo; { int status; pid_t pid; struct filed *f; while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { if (!Initialized) /* Don't tell while we are initting. */ continue; /* First, look if it's a process from the dead queue. */ if (deadq_remove(pid)) goto oncemore; /* Now, look in list of active processes. */ for (f = Files; f; f = f->f_next) if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid == pid) { (void)close(f->f_file); f->f_un.f_pipe.f_pid = 0; log_deadchild(pid, status, f->f_un.f_pipe.f_pname); break; } oncemore: continue; } } /* * Return a printable representation of a host address. */ char * cvthname(f) struct sockaddr_in *f; { struct hostent *hp; sigset_t omask, nmask; char *p; dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); if (f->sin_family != AF_INET) { dprintf("Malformed from address\n"); return ("???"); } sigemptyset(&nmask); sigaddset(&nmask, SIGHUP); sigprocmask(SIG_BLOCK, &nmask, &omask); hp = gethostbyaddr((char *)&f->sin_addr, sizeof(struct in_addr), f->sin_family); sigprocmask(SIG_SETMASK, &omask, NULL); if (hp == 0) { dprintf("Host name for your address (%s) unknown\n", inet_ntoa(f->sin_addr)); return (inet_ntoa(f->sin_addr)); } if ((p = strchr(hp->h_name, '.')) && strcasecmp(p + 1, LocalDomain) == 0) *p = '\0'; return (hp->h_name); } void domark(signo) int signo; { struct filed *f; dq_t q; now = time((time_t *)NULL); MarkSeq += TIMERINTVL; if (MarkSeq >= MarkInterval) { logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); MarkSeq = 0; } for (f = Files; f; f = f->f_next) { if (f->f_prevcount && now >= REPEATTIME(f)) { dprintf("flush %s: repeated %d times, %d sec.\n", TypeNames[f->f_type], f->f_prevcount, repeatinterval[f->f_repeatcount]); fprintlog(f, 0, (char *)NULL); BACKOFF(f); } } /* Walk the dead queue, and see if we should signal somebody. */ for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) switch (q->dq_timeout) { case 0: /* Already signalled once, try harder now. */ if (kill(q->dq_pid, SIGKILL) != 0) (void)deadq_remove(q->dq_pid); break; case 1: /* * Timed out on dead queue, send terminate * signal. Note that we leave the removal * from the dead queue to reapchild(), which * will also log the event (unless the process * didn't even really exist, in case we simply * drop it from the dead queue). */ if (kill(q->dq_pid, SIGTERM) != 0) (void)deadq_remove(q->dq_pid); /* FALLTHROUGH */ default: q->dq_timeout--; } (void)alarm(TIMERINTVL); } /* * Print syslogd errors some place. */ void logerror(type) const char *type; { char buf[512]; if (errno) (void)snprintf(buf, sizeof buf, "syslogd: %s: %s", type, strerror(errno)); else (void)snprintf(buf, sizeof buf, "syslogd: %s", type); errno = 0; dprintf("%s\n", buf); logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); } void die(signo) int signo; { struct filed *f; int was_initialized; char buf[100]; int i; was_initialized = Initialized; Initialized = 0; /* Don't log SIGCHLDs. */ for (f = Files; f != NULL; f = f->f_next) { /* flush any pending output */ if (f->f_prevcount) fprintlog(f, 0, (char *)NULL); if (f->f_type == F_PIPE) (void)close(f->f_file); } Initialized = was_initialized; if (signo) { dprintf("syslogd: exiting on signal %d\n", signo); (void)sprintf(buf, "exiting on signal %d", signo); errno = 0; logerror(buf); } for (i = 0; i < nfunix; i++) if (funixn[i] && funix[i] != -1) (void)unlink(funixn[i]); exit(1); } /* * INIT -- Initialize syslogd from configuration table */ void init(signo) int signo; { int i; FILE *cf; struct filed *f, *next, **nextp; char *p; char cline[LINE_MAX]; char prog[NAME_MAX+1]; char host[MAXHOSTNAMELEN+1]; dprintf("init\n"); /* * Close all open log files. */ Initialized = 0; for (f = Files; f != NULL; f = next) { /* flush any pending output */ if (f->f_prevcount) fprintlog(f, 0, (char *)NULL); switch (f->f_type) { case F_FILE: case F_FORW: case F_CONSOLE: case F_TTY: (void)close(f->f_file); break; case F_PIPE: (void)close(f->f_file); if (f->f_un.f_pipe.f_pid > 0) deadq_enter(f->f_un.f_pipe.f_pid, f->f_un.f_pipe.f_pname); f->f_un.f_pipe.f_pid = 0; break; } next = f->f_next; if(f->f_program) free(f->f_program); if (f->f_host) free(f->f_host); free((char *)f); } Files = NULL; nextp = &Files; /* open the configuration file */ if ((cf = fopen(ConfFile, "r")) == NULL) { dprintf("cannot open %s\n", ConfFile); *nextp = (struct filed *)calloc(1, sizeof(*f)); cfline("*.ERR\t/dev/console", *nextp, "*", "*"); (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); Initialized = 1; return; } /* * Foreach line in the conf table, open that file. */ f = NULL; strcpy(host, "*"); strcpy(prog, "*"); while (fgets(cline, sizeof(cline), cf) != NULL) { /* * check for end-of-section, comments, strip off trailing * spaces and newline character. #!prog is treated specially: * following lines apply only to that program. */ for (p = cline; isspace(*p); ++p) continue; if (*p == 0) continue; if(*p == '#') { p++; if (*p != '!' && *p != '+' && *p != '-') continue; } if (*p == '+' || *p == '-') { host[0] = *p++; while (isspace(*p)) p++; if ((!*p) || (*p == '*')) { strcpy(host, "*"); continue; } if (*p == '@') p = LocalHostName; for (i = 1; i < MAXHOSTNAMELEN; i++) { if (!isalnum(*p) && *p != '.' && *p != '-') break; host[i] = *p++; } host[i] = '\0'; continue; } if(*p=='!') { p++; while(isspace(*p)) p++; if((!*p) || (*p == '*')) { strcpy(prog, "*"); continue; } for(i = 0; i < NAME_MAX; i++) { if(!isalnum(p[i])) break; prog[i] = p[i]; } prog[i] = 0; continue; } for (p = strchr(cline, '\0'); isspace(*--p);) continue; *++p = '\0'; f = (struct filed *)calloc(1, sizeof(*f)); *nextp = f; nextp = &f->f_next; cfline(cline, f, prog, host); } /* close the configuration file */ (void)fclose(cf); Initialized = 1; if (Debug) { for (f = Files; f; f = f->f_next) { for (i = 0; i <= LOG_NFACILITIES; i++) if (f->f_pmask[i] == INTERNAL_NOPRI) printf("X "); else printf("%d ", f->f_pmask[i]); printf("%s: ", TypeNames[f->f_type]); switch (f->f_type) { case F_FILE: printf("%s", f->f_un.f_fname); break; case F_CONSOLE: case F_TTY: printf("%s%s", _PATH_DEV, f->f_un.f_fname); break; case F_FORW: printf("%s", f->f_un.f_forw.f_hname); break; case F_PIPE: printf("%s", f->f_un.f_pipe.f_pname); break; case F_USERS: for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) printf("%s, ", f->f_un.f_uname[i]); break; } if(f->f_program) { printf(" (%s)", f->f_program); } printf("\n"); } } logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); dprintf("syslogd: restarted\n"); } /* * Crack a configuration file line */ void cfline(line, f, prog, host) char *line; struct filed *f; char *prog; char *host; { struct hostent *hp; int i, pri; char *bp, *p, *q; char buf[MAXLINE], ebuf[100]; dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); errno = 0; /* keep strerror() stuff out of logerror messages */ /* clear out file entry */ memset(f, 0, sizeof(*f)); for (i = 0; i <= LOG_NFACILITIES; i++) f->f_pmask[i] = INTERNAL_NOPRI; /* save hostname if any */ if (host && *host == '*') host = NULL; if (host) { f->f_host = calloc(1, strlen(host)+1); if (f->f_host) { strcpy(f->f_host, host); } } /* save program name if any */ if(prog && *prog=='*') prog = NULL; if(prog) { f->f_program = calloc(1, strlen(prog)+1); if(f->f_program) { strcpy(f->f_program, prog); } } /* scan through the list of selectors */ for (p = line; *p && *p != '\t' && *p != ' ';) { int pri_done; int pri_cmp; /* find the end of this facility name list */ for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) continue; /* get the priority comparison */ pri_cmp = 0; pri_done = 0; while (!pri_done) { switch (*q) { case '<': pri_cmp |= PRI_LT; q++; break; case '=': pri_cmp |= PRI_EQ; q++; break; case '>': pri_cmp |= PRI_GT; q++; break; default: pri_done++; break; } } if (!pri_cmp) pri_cmp = (UniquePriority) ? (PRI_EQ) : (PRI_EQ | PRI_GT) ; /* collect priority name */ for (bp = buf; *q && !strchr("\t,; ", *q); ) *bp++ = *q++; *bp = '\0'; /* skip cruft */ while (strchr(",;", *q)) q++; /* decode priority name */ if (*buf == '*') pri = LOG_PRIMASK + 1; else { pri = decode(buf, prioritynames); if (pri < 0) { (void)snprintf(ebuf, sizeof ebuf, "unknown priority name \"%s\"", buf); logerror(ebuf); return; } } /* scan facilities */ while (*p && !strchr("\t.; ", *p)) { for (bp = buf; *p && !strchr("\t,;. ", *p); ) *bp++ = *p++; *bp = '\0'; if (*buf == '*') for (i = 0; i < LOG_NFACILITIES; i++) { f->f_pmask[i] = pri; f->f_pcmp[i] = pri_cmp; } else { i = decode(buf, facilitynames); if (i < 0) { (void)snprintf(ebuf, sizeof ebuf, "unknown facility name \"%s\"", buf); logerror(ebuf); return; } f->f_pmask[i >> 3] = pri; f->f_pcmp[i >> 3] = pri_cmp; } while (*p == ',' || *p == ' ') p++; } p = q; } /* skip to action part */ while (*p == '\t' || *p == ' ') p++; switch (*p) { case '@': (void)strncpy(f->f_un.f_forw.f_hname, ++p, sizeof(f->f_un.f_forw.f_hname)-1); f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0'; hp = gethostbyname(f->f_un.f_forw.f_hname); if (hp == NULL) { extern int h_errno; logerror(hstrerror(h_errno)); break; } memset(&f->f_un.f_forw.f_addr, 0, sizeof(f->f_un.f_forw.f_addr)); f->f_un.f_forw.f_addr.sin_family = AF_INET; f->f_un.f_forw.f_addr.sin_port = LogPort; memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); f->f_type = F_FORW; break; case '/': if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { f->f_type = F_UNUSED; logerror(p); break; } if (isatty(f->f_file)) { if (strcmp(p, ctty) == 0) f->f_type = F_CONSOLE; else f->f_type = F_TTY; (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); } else { (void)strcpy(f->f_un.f_fname, p); f->f_type = F_FILE; } break; case '|': f->f_un.f_pipe.f_pid = 0; (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); f->f_type = F_PIPE; break; case '*': f->f_type = F_WALL; break; default: for (i = 0; i < MAXUNAMES && *p; i++) { for (q = p; *q && *q != ','; ) q++; (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); if ((q - p) > UT_NAMESIZE) f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; else f->f_un.f_uname[i][q - p] = '\0'; while (*q == ',' || *q == ' ') q++; p = q; } f->f_type = F_USERS; break; } } /* * Decode a symbolic name to a numeric value */ int decode(name, codetab) const char *name; CODE *codetab; { CODE *c; char *p, buf[40]; if (isdigit(*name)) return (atoi(name)); for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { if (isupper(*name)) *p = tolower(*name); else *p = *name; } *p = '\0'; for (c = codetab; c->c_name; c++) if (!strcmp(buf, c->c_name)) return (c->c_val); return (-1); } /* * fork off and become a daemon, but wait for the child to come online * before returing to the parent, or we get disk thrashing at boot etc. * Set a timer so we don't hang forever if it wedges. */ int waitdaemon(nochdir, noclose, maxwait) int nochdir, noclose, maxwait; { int fd; int status; pid_t pid, childpid; switch (childpid = fork()) { case -1: return (-1); case 0: break; default: signal(SIGALRM, timedout); alarm(maxwait); while ((pid = wait3(&status, 0, NULL)) != -1) { if (WIFEXITED(status)) errx(1, "child pid %d exited with return code %d", pid, WEXITSTATUS(status)); if (WIFSIGNALED(status)) errx(1, "child pid %d exited on signal %d%s", pid, WTERMSIG(status), WCOREDUMP(status) ? " (core dumped)" : ""); if (pid == childpid) /* it's gone... */ break; } exit(0); } if (setsid() == -1) return (-1); if (!nochdir) (void)chdir("/"); if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { (void)dup2(fd, STDIN_FILENO); (void)dup2(fd, STDOUT_FILENO); (void)dup2(fd, STDERR_FILENO); if (fd > 2) (void)close (fd); } return (getppid()); } /* * We get a SIGALRM from the child when it's running and finished doing it's * fsync()'s or O_SYNC writes for all the boot messages. * * We also get a signal from the kernel if the timer expires, so check to * see what happened. */ void timedout(sig) int sig __unused; { int left; left = alarm(0); signal(SIGALRM, SIG_DFL); if (left == 0) errx(1, "timed out waiting for child"); else exit(0); } /* * Add `s' to the list of allowable peer addresses to accept messages * from. * * `s' is a string in the form: * * [*]domainname[:{servicename|portnumber|*}] * * or * * netaddr/maskbits[:{servicename|portnumber|*}] * * Returns -1 on error, 0 if the argument was valid. */ int allowaddr(s) char *s; { char *cp1, *cp2; struct allowedpeer ap; struct servent *se; regex_t re; int i; if ((cp1 = strrchr(s, ':'))) { /* service/port provided */ *cp1++ = '\0'; if (strlen(cp1) == 1 && *cp1 == '*') /* any port allowed */ ap.port = htons(0); else if ((se = getservbyname(cp1, "udp"))) ap.port = se->s_port; else { ap.port = htons((int)strtol(cp1, &cp2, 0)); if (*cp2 != '\0') return -1; /* port not numeric */ } } else { if ((se = getservbyname("syslog", "udp"))) ap.port = se->s_port; else /* sanity, should not happen */ ap.port = htons(514); } /* the regexp's are ugly, but the cleanest way */ if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", REG_EXTENDED)) /* if RE compilation fails, that's an internal error */ abort(); if (regexec(&re, s, 0, 0, 0) == 0) { /* arg `s' is numeric */ ap.isnumeric = 1; if ((cp1 = strchr(s, '/')) != NULL) { *cp1++ = '\0'; i = atoi(cp1); if (i < 0 || i > 32) return -1; /* convert masklen to netmask */ ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); } if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) return -1; if (cp1 == NULL) { /* use default netmask */ if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) ap.a_mask.s_addr = htonl(IN_CLASSA_NET); else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) ap.a_mask.s_addr = htonl(IN_CLASSB_NET); else ap.a_mask.s_addr = htonl(IN_CLASSC_NET); } } else { /* arg `s' is domain name */ ap.isnumeric = 0; ap.a_name = s; } regfree(&re); if (Debug) { printf("allowaddr: rule %d: ", NumAllowed); if (ap.isnumeric) { printf("numeric, "); printf("addr = %s, ", addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); printf("mask = %s; ", addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); } else printf("domainname = %s; ", ap.a_name); printf("port = %d\n", ntohs(ap.port)); } if ((AllowedPeers = realloc(AllowedPeers, ++NumAllowed * sizeof(struct allowedpeer))) == NULL) { fprintf(stderr, "Out of memory!\n"); exit(EX_OSERR); } memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); return 0; } /* * Validate that the remote peer has permission to log to us. */ int validate(sin, hname) struct sockaddr_in *sin; const char *hname; { int i; size_t l1, l2; char *cp, name[MAXHOSTNAMELEN]; struct allowedpeer *ap; if (NumAllowed == 0) /* traditional behaviour, allow everything */ return 1; strlcpy(name, hname, sizeof name); if (strchr(name, '.') == NULL) { strlcat(name, ".", sizeof name); strlcat(name, LocalDomain, sizeof name); } dprintf("validate: dgram from IP %s, port %d, name %s;\n", addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), ntohs(sin->sin_port), name); /* now, walk down the list */ for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { dprintf("rejected in rule %d due to port mismatch.\n", i); continue; } if (ap->isnumeric) { if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) != ap->a_addr.s_addr) { dprintf("rejected in rule %d due to IP mismatch.\n", i); continue; } } else { cp = ap->a_name; l1 = strlen(name); if (*cp == '*') { /* allow wildmatch */ cp++; l2 = strlen(cp); if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { dprintf("rejected in rule %d due to name mismatch.\n", i); continue; } } else { /* exact match */ l2 = strlen(cp); if (l2 != l1 || memcmp(cp, name, l1) != 0) { dprintf("rejected in rule %d due to name mismatch.\n", i); continue; } } } dprintf("accepted in rule %d.\n", i); return 1; /* hooray! */ } return 0; } /* * Fairly similar to popen(3), but returns an open descriptor, as * opposed to a FILE *. */ int p_open(prog, pid) char *prog; pid_t *pid; { int pfd[2], nulldesc, i; sigset_t omask, mask; char *argv[4]; /* sh -c cmd NULL */ char errmsg[200]; if (pipe(pfd) == -1) return -1; if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) /* we are royally screwed anyway */ return -1; sigemptyset(&mask); sigaddset(&mask, SIGALRM); sigaddset(&mask, SIGHUP); sigprocmask(SIG_BLOCK, &mask, &omask); switch ((*pid = fork())) { case -1: sigprocmask(SIG_SETMASK, &omask, 0); close(nulldesc); return -1; case 0: argv[0] = "sh"; argv[1] = "-c"; argv[2] = prog; argv[3] = NULL; alarm(0); (void)setsid(); /* Avoid catching SIGHUPs. */ /* * Throw away pending signals, and reset signal * behaviour to standard values. */ signal(SIGALRM, SIG_IGN); signal(SIGHUP, SIG_IGN); sigprocmask(SIG_SETMASK, &omask, 0); signal(SIGPIPE, SIG_DFL); signal(SIGQUIT, SIG_DFL); signal(SIGALRM, SIG_DFL); signal(SIGHUP, SIG_DFL); dup2(pfd[0], STDIN_FILENO); dup2(nulldesc, STDOUT_FILENO); dup2(nulldesc, STDERR_FILENO); for (i = getdtablesize(); i > 2; i--) (void) close(i); (void) execvp(_PATH_BSHELL, argv); _exit(255); } sigprocmask(SIG_SETMASK, &omask, 0); close(nulldesc); close(pfd[0]); /* * Avoid blocking on a hung pipe. With O_NONBLOCK, we are * supposed to get an EWOULDBLOCK on writev(2), which is * caught by the logic above anyway, which will in turn close * the pipe, and fork a new logging subprocess if necessary. * The stale subprocess will be killed some time later unless * it terminated itself due to closing its input pipe (so we * get rid of really dead puppies). */ if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { /* This is bad. */ (void)snprintf(errmsg, sizeof errmsg, "Warning: cannot change pipe to PID %d to " "non-blocking behaviour.", (int)*pid); logerror(errmsg); } return pfd[1]; } void deadq_enter(pid, name) pid_t pid; const char *name; { dq_t p; int status; /* * Be paranoid, if we can't signal the process, don't enter it * into the dead queue (perhaps it's already dead). If possible, * we try to fetch and log the child's status. */ if (kill(pid, 0) != 0) { if (waitpid(pid, &status, WNOHANG) > 0) log_deadchild(pid, status, name); return; } p = malloc(sizeof(struct deadq_entry)); if (p == 0) { errno = 0; logerror("panic: out of virtual memory!"); exit(1); } p->dq_pid = pid; p->dq_timeout = DQ_TIMO_INIT; TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); } int deadq_remove(pid) pid_t pid; { dq_t q; for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) if (q->dq_pid == pid) { TAILQ_REMOVE(&deadq_head, q, dq_entries); free(q); return 1; } return 0; } void log_deadchild(pid, status, name) pid_t pid; int status; const char *name; { int code; char buf[256]; const char *reason; errno = 0; /* Keep strerror() stuff out of logerror messages. */ if (WIFSIGNALED(status)) { reason = "due to signal"; code = WTERMSIG(status); } else { reason = "with status"; code = WEXITSTATUS(status); if (code == 0) return; } (void)snprintf(buf, sizeof buf, "Logging subprocess %d (%s) exited %s %d.", pid, name, reason, code); logerror(buf); }