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NetBSD/usr.sbin/syslogd/syslogd.c

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/* $NetBSD: syslogd.c,v 1.75 2005/01/09 00:07:27 christos Exp $ */
/*
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__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";
#else
__RCSID("$NetBSD: syslogd.c,v 1.75 2005/01/09 00:07:27 christos Exp $");
#endif
#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 "<n>" 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_NOTICE)
#define TIMERINTVL 30 /* interval for checking flush, mark */
#define TTYMSGTIME 1 /* timeout passed to ttymsg */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <sys/queue.h>
#include <sys/event.h>
#include <netinet/in.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <locale.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include "utmpentry.h"
#include "pathnames.h"
#define SYSLOG_NAMES
#include <sys/syslog.h>
#ifdef LIBWRAP
#include <tcpd.h>
int allow_severity = LOG_AUTH|LOG_INFO;
int deny_severity = LOG_AUTH|LOG_WARNING;
#endif
char *ConfFile = _PATH_LOGCONF;
char ctty[] = _PATH_CONSOLE;
#define FDMASK(fd) (1 << (fd))
#define dprintf if (Debug) printf
#define MAXUNAMES 20 /* maximum number of user names */
/*
* 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.
* We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY,
* or if f_type is F_PIPE and f_pid > 0.
*/
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 record */
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];
struct addrinfo *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]; /* 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 */
int f_lasterror; /* last error on writev() */
int f_flags; /* file-specific flags */
#define FFLAG_SYNC 0x01
};
/*
* Queue of about-to-be-dead processes we should watch out for.
*/
TAILQ_HEAD(, deadq_entry) deadq_head = TAILQ_HEAD_INITIALIZER(deadq_head);
typedef struct deadq_entry {
pid_t dq_pid;
int dq_timeout;
TAILQ_ENTRY(deadq_entry) dq_entries;
} *dq_t;
/*
* 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
/*
* 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 daemonized = 0; /* we are not daemonized yet */
char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */
char oldLocalHostName[MAXHOSTNAMELEN];/* previous hostname */
char *LocalDomain; /* our local domain name */
size_t LocalDomainLen; /* length of LocalDomain */
int *finet = NULL; /* Internet datagram sockets */
int Initialized; /* set when we have initialized ourselves */
int ShuttingDown; /* set when we die() */
int MarkInterval = 20 * 60; /* interval between marks in seconds */
int MarkSeq = 0; /* mark sequence number */
int SecureMode = 0; /* listen only on unix domain socks */
int UseNameService = 1; /* make domain name queries */
int NumForwards = 0; /* number of forwarding actions in conf file */
char **LogPaths; /* array of pathnames to read messages from */
int NoRepeat = 0; /* disable "repeated"; log always */
int SyncKernel = 0; /* write kernel messages synchronously */
int UniquePriority = 0; /* only log specified priority */
int LogFacPri = 0; /* put facility and priority in log messages: */
/* 0=no, 1=numeric, 2=names */
void cfline(char *, struct filed *, char *, char *);
char *cvthname(struct sockaddr_storage *);
void deadq_enter(pid_t, const char *);
int deadq_remove(pid_t);
int decode(const char *, CODE *);
void die(struct kevent *); /* SIGTERM kevent dispatch routine */
void domark(struct kevent *);/* timer kevent dispatch routine */
void fprintlog(struct filed *, int, char *);
int getmsgbufsize(void);
int* socksetup(int);
void init(struct kevent *); /* SIGHUP kevent dispatch routine */
void logerror(const char *, ...);
void logmsg(int, char *, char *, int);
void log_deadchild(pid_t, int, const char *);
int matches_spec(const char *, const char *,
char *(*)(const char *, const char *));
void printline(char *, char *);
void printsys(char *);
int p_open(char *, pid_t *);
void trim_localdomain(char *);
void reapchild(struct kevent *); /* SIGCHLD kevent dispatch routine */
void usage(void);
void wallmsg(struct filed *, struct iovec *, size_t);
int main(int, char *[]);
void logpath_add(char ***, int *, int *, char *);
void logpath_fileadd(char ***, int *, int *, char *);
static int fkq;
static struct kevent *allocevchange(void);
static int wait_for_events(struct kevent *, size_t);
static void dispatch_read_klog(struct kevent *);
static void dispatch_read_finet(struct kevent *);
static void dispatch_read_funix(struct kevent *);
/*
* Global line buffer. Since we only process one event at a time,
* a global one will do.
*/
static char *linebuf;
static size_t linebufsize;
#define A_CNT(x) (sizeof((x)) / sizeof((x)[0]))
int
main(int argc, char *argv[])
{
int ch, *funix, j, fklog;
int funixsize = 0, funixmaxsize = 0;
struct kevent events[16];
struct sockaddr_un sunx;
char **pp;
struct kevent *ev;
uid_t uid = 0;
gid_t gid = 0;
char *user = NULL;
char *group = NULL;
char *root = "/";
char *endp;
struct group *gr;
struct passwd *pw;
unsigned long l;
(void)setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "dnsSf:m:p:P:ru:g:t:Uv")) != -1)
switch(ch) {
case 'd': /* debug */
Debug++;
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'g':
group = optarg;
if (*group == '\0')
usage();
break;
case 'm': /* mark interval */
MarkInterval = atoi(optarg) * 60;
break;
case 'n': /* turn off DNS queries */
UseNameService = 0;
break;
case 'p': /* path */
logpath_add(&LogPaths, &funixsize,
&funixmaxsize, optarg);
break;
case 'P': /* file of paths */
logpath_fileadd(&LogPaths, &funixsize,
&funixmaxsize, optarg);
break;
case 'r': /* disable "repeated" compression */
NoRepeat++;
break;
case 's': /* no network listen mode */
SecureMode++;
break;
case 'S':
SyncKernel = 1;
break;
case 't':
root = optarg;
if (*root == '\0')
usage();
break;
case 'u':
user = optarg;
if (*user == '\0')
usage();
break;
case 'U': /* only log specified priority */
UniquePriority = 1;
break;
case 'v': /* log facility and priority */
if (LogFacPri < 2)
LogFacPri++;
break;
default:
usage();
}
if ((argc -= optind) != 0)
usage();
setlinebuf(stdout);
if (user != NULL) {
if (isdigit((unsigned char)*user)) {
errno = 0;
endp = NULL;
l = strtoul(user, &endp, 0);
if (errno || *endp != '\0')
goto getuser;
uid = (uid_t)l;
if (uid != l) {
errno = 0;
logerror("UID out of range");
die(NULL);
}
} else {
getuser:
if ((pw = getpwnam(user)) != NULL) {
uid = pw->pw_uid;
} else {
errno = 0;
logerror("Cannot find user `%s'", user);
die(NULL);
}
}
}
if (group != NULL) {
if (isdigit((unsigned char)*group)) {
errno = 0;
endp = NULL;
l = strtoul(group, &endp, 0);
if (errno || *endp != '\0')
goto getgroup;
gid = (gid_t)l;
if (gid != l) {
errno = 0;
logerror("GID out of range");
die(NULL);
}
} else {
getgroup:
if ((gr = getgrnam(group)) != NULL) {
gid = gr->gr_gid;
} else {
errno = 0;
logerror("Cannot find group `%s'", group);
die(NULL);
}
}
}
if (access(root, F_OK | R_OK)) {
logerror("Cannot access `%s'", root);
die(NULL);
}
consfile.f_type = F_CONSOLE;
(void)strlcpy(consfile.f_un.f_fname, ctty,
sizeof(consfile.f_un.f_fname));
linebufsize = getmsgbufsize();
if (linebufsize < MAXLINE)
linebufsize = MAXLINE;
linebufsize++;
linebuf = malloc(linebufsize);
if (linebuf == NULL) {
logerror("Couldn't allocate line buffer");
die(NULL);
}
#ifndef SUN_LEN
#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
#endif
if (funixsize == 0)
logpath_add(&LogPaths, &funixsize,
&funixmaxsize, _PATH_LOG);
funix = (int *)malloc(sizeof(int) * funixsize);
if (funix == NULL) {
logerror("Couldn't allocate funix descriptors");
die(NULL);
}
for (j = 0, pp = LogPaths; *pp; pp++, j++) {
dprintf("Making unix dgram socket `%s'\n", *pp);
unlink(*pp);
memset(&sunx, 0, sizeof(sunx));
sunx.sun_family = AF_LOCAL;
(void)strncpy(sunx.sun_path, *pp, sizeof(sunx.sun_path));
funix[j] = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (funix[j] < 0 || bind(funix[j],
(struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
chmod(*pp, 0666) < 0) {
logerror("Cannot create `%s'", *pp);
die(NULL);
}
dprintf("Listening on unix dgram socket `%s'\n", *pp);
}
if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) < 0) {
dprintf("Can't open `%s' (%d)\n", _PATH_KLOG, errno);
} else {
dprintf("Listening on kernel log `%s'\n", _PATH_KLOG);
}
/*
* All files are open, we can drop privileges and chroot
*/
dprintf("Attempt to chroot to `%s'\n", root);
if (chroot(root)) {
logerror("Failed to chroot to `%s'", root);
die(NULL);
}
dprintf("Attempt to set GID/EGID to `%d'\n", gid);
if (setgid(gid) || setegid(gid)) {
logerror("Failed to set gid to `%d'", gid);
die(NULL);
}
dprintf("Attempt to set UID/EUID to `%d'\n", uid);
if (setuid(uid) || seteuid(uid)) {
logerror("Failed to set uid to `%d'", uid);
die(NULL);
}
/*
* We cannot detach from the terminal before we are sure we won't
* have a fatal error, because error message would not go to the
* terminal and would not be logged because syslogd dies.
* All die() calls are behind us, we can call daemon()
*/
if (!Debug) {
(void)daemon(0, 0);
daemonized = 1;
/* tuck my process id away, if i'm not in debug mode */
pidfile(NULL);
}
/*
* Create the global kernel event descriptor.
*
* NOTE: We MUST do this after daemon(), bacause the kqueue()
* API dictates that kqueue descriptors are not inherited
* across forks (lame!).
*/
if ((fkq = kqueue()) < 0) {
logerror("Cannot create event queue");
die(NULL); /* XXX This error is lost! */
}
/*
* We must read the configuration file for the first time
* after the kqueue descriptor is created, because we install
* events during this process.
*/
init(NULL);
/*
* Always exit on SIGTERM. Also exit on SIGINT and SIGQUIT
* if we're debugging.
*/
(void)signal(SIGTERM, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
ev = allocevchange();
EV_SET(ev, SIGTERM, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0,
(intptr_t) die);
if (Debug) {
ev = allocevchange();
EV_SET(ev, SIGINT, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0,
(intptr_t) die);
ev = allocevchange();
EV_SET(ev, SIGQUIT, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0,
(intptr_t) die);
}
ev = allocevchange();
EV_SET(ev, SIGCHLD, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0,
(intptr_t) reapchild);
ev = allocevchange();
EV_SET(ev, 0, EVFILT_TIMER, EV_ADD | EV_ENABLE, 0,
TIMERINTVL * 1000 /* seconds -> ms */, (intptr_t) domark);
(void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
/* Re-read configuration on SIGHUP. */
(void) signal(SIGHUP, SIG_IGN);
ev = allocevchange();
EV_SET(ev, SIGHUP, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0,
(intptr_t) init);
if (fklog >= 0) {
ev = allocevchange();
EV_SET(ev, fklog, EVFILT_READ, EV_ADD | EV_ENABLE,
0, 0, (intptr_t) dispatch_read_klog);
}
for (j = 0, pp = LogPaths; *pp; pp++, j++) {
ev = allocevchange();
EV_SET(ev, funix[j], EVFILT_READ, EV_ADD | EV_ENABLE,
0, 0, (intptr_t) dispatch_read_funix);
}
dprintf("Off & running....\n");
for (;;) {
void (*handler)(struct kevent *);
int i, rv;
rv = wait_for_events(events, A_CNT(events));
if (rv == 0)
continue;
if (rv < 0) {
if (errno != EINTR)
logerror("kevent() failed");
continue;
}
dprintf("Got an event (%d)\n", rv);
for (i = 0; i < rv; i++) {
handler = (void *) events[i].udata;
(*handler)(&events[i]);
}
}
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-dnrSsUv] [-f config_file] [-g group] [-m mark_interval]\n"
"\t[-P file_list] [-p log_socket [-p log_socket2 ...]]\n"
"\t[-t chroot_dir] [-u user]\n", getprogname());
exit(1);
}
/*
* Dispatch routine for reading /dev/klog
*/
static void
dispatch_read_klog(struct kevent *ev)
{
ssize_t rv;
int fd = ev->ident;
dprintf("Kernel log active\n");
rv = read(fd, linebuf, linebufsize - 1);
if (rv > 0) {
linebuf[rv] = '\0';
printsys(linebuf);
} else if (rv < 0 && errno != EINTR) {
/*
* /dev/klog has croaked. Disable the event
* so it won't bother us again.
*/
struct kevent *cev = allocevchange();
logerror("klog failed");
EV_SET(cev, fd, EVFILT_READ, EV_DISABLE,
0, 0, (intptr_t) dispatch_read_klog);
}
}
/*
* Dispatch routine for reading Unix domain sockets.
*/
static void
dispatch_read_funix(struct kevent *ev)
{
struct sockaddr_un myname, fromunix;
ssize_t rv;
socklen_t sunlen;
int fd = ev->ident;
sunlen = sizeof(myname);
if (getsockname(fd, (struct sockaddr *)&myname, &sunlen) != 0) {
/*
* This should never happen, so ensure that it doesn't
* happen again.
*/
struct kevent *cev = allocevchange();
logerror("getsockname() unix failed");
EV_SET(cev, fd, EVFILT_READ, EV_DISABLE,
0, 0, (intptr_t) dispatch_read_funix);
return;
}
dprintf("Unix socket (%s) active\n", myname.sun_path);
sunlen = sizeof(fromunix);
rv = recvfrom(fd, linebuf, MAXLINE, 0,
(struct sockaddr *)&fromunix, &sunlen);
if (rv > 0) {
linebuf[rv] = '\0';
printline(LocalHostName, linebuf);
} else if (rv < 0 && errno != EINTR) {
logerror("recvfrom() unix `%s'", myname.sun_path);
}
}
/*
* Dispatch routine for reading Internet sockets.
*/
static void
dispatch_read_finet(struct kevent *ev)
{
#ifdef LIBWRAP
struct request_info req;
#endif
struct sockaddr_storage frominet;
ssize_t rv;
socklen_t len;
int fd = ev->ident;
int reject = 0;
dprintf("inet socket active\n");
#ifdef LIBWRAP
request_init(&req, RQ_DAEMON, "syslogd", RQ_FILE, fd, NULL);
fromhost(&req);
reject = !hosts_access(&req);
if (reject)
dprintf("access denied\n");
#endif
len = sizeof(frominet);
rv = recvfrom(fd, linebuf, MAXLINE, 0,
(struct sockaddr *)&frominet, &len);
if (rv == 0 || (rv < 0 && errno == EINTR))
return;
else if (rv < 0) {
logerror("recvfrom inet");
return;
}
linebuf[rv] = '\0';
if (!reject)
printline(cvthname(&frominet), linebuf);
}
/*
* given a pointer to an array of char *'s, a pointer to it's current
* size and current allocated max size, and a new char * to add, add
* it, update everything as necessary, possibly allocating a new array
*/
void
logpath_add(char ***lp, int *szp, int *maxszp, char *new)
{
char **nlp;
int newmaxsz;
dprintf("Adding `%s' to the %p logpath list\n", new, *lp);
if (*szp == *maxszp) {
if (*maxszp == 0) {
newmaxsz = 4; /* start of with enough for now */
*lp = NULL;
} else
newmaxsz = *maxszp * 2;
nlp = realloc(*lp, sizeof(char *) * (newmaxsz + 1));
if (nlp == NULL) {
logerror("Couldn't allocate line buffer");
die(NULL);
}
*lp = nlp;
*maxszp = newmaxsz;
}
if (((*lp)[(*szp)++] = strdup(new)) == NULL) {
logerror("Couldn't allocate logpath");
die(NULL);
}
(*lp)[(*szp)] = NULL; /* always keep it NULL terminated */
}
/* do a file of log sockets */
void
logpath_fileadd(char ***lp, int *szp, int *maxszp, char *file)
{
FILE *fp;
char *line;
size_t len;
fp = fopen(file, "r");
if (fp == NULL) {
logerror("Could not open socket file list `%s'", file);
die(NULL);
}
while ((line = fgetln(fp, &len))) {
line[len - 1] = 0;
logpath_add(lp, szp, maxszp, line);
}
fclose(fp);
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
void
printline(char *hname, char *msg)
{
int c, pri;
char *p, *q, line[MAXLINE + 1];
long n;
/* test for special codes */
pri = DEFUPRI;
p = msg;
if (*p == '<') {
errno = 0;
n = strtol(p + 1, &q, 10);
if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
p = q + 1;
pri = (int)n;
}
}
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFUPRI;
/*
* Don't allow users to log kernel messages.
* NOTE: Since LOG_KERN == 0, this will also match
* messages with no facility specified.
*/
if ((pri & LOG_FACMASK) == LOG_KERN)
pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
q = line;
while ((c = *p++) != '\0' &&
q < &line[sizeof(line) - 2]) {
c &= 0177;
if (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);
}
/*
* Take a raw input line from /dev/klog, split and format similar to syslog().
*/
void
printsys(char *msg)
{
int n, pri, flags, is_printf;
char *p, *q;
for (p = msg; *p != '\0'; ) {
flags = ISKERNEL | ADDDATE;
if (SyncKernel)
flags |= SYNC_FILE;
pri = DEFSPRI;
is_printf = 1;
if (*p == '<') {
errno = 0;
n = (int)strtol(p + 1, &q, 10);
if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
p = q + 1;
pri = n;
is_printf = 0;
}
}
if (is_printf) {
/* kernel printf's come out on console */
flags |= IGN_CONS;
}
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFSPRI;
for (q = p; *q != '\0' && *q != '\n'; q++)
/* look for end of line */;
if (*q != '\0')
*q++ = '\0';
logmsg(pri, p, LocalHostName, flags);
p = q;
}
}
time_t now;
/*
* Check to see if `name' matches the provided specification, using the
* specified strstr function.
*/
int
matches_spec(const char *name, const char *spec,
char *(*check)(const char *, const char *))
{
const char *s;
char prev, next;
if ((s = (*check)(spec, name)) != NULL) {
prev = s == spec ? ',' : *(s - 1);
next = *(s + strlen(name));
if (prev == ',' && (next == '\0' || next == ','))
return (1);
}
return (0);
}
/*
* Log a message to the appropriate log files, users, etc. based on
* the priority.
*/
void
logmsg(int pri, char *msg, char *from, int flags)
{
struct filed *f;
int fac, msglen, omask, prilev, i;
char *timestamp;
char prog[NAME_MAX + 1];
char buf[MAXLINE + 1];
dprintf("logmsg: pri 0%o, flags 0x%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 whitespace */
while (isspace((unsigned char)*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 (!isprint((unsigned char)msg[i]) ||
msg[i] == ':' || 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",
_PATH_UNIX, 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) {
(void)strncpy(f->f_lasttime, timestamp, 15);
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 host name */
if (f->f_host != NULL) {
switch (f->f_host[0]) {
case '+':
if (! matches_spec(from, f->f_host + 1,
strcasestr))
continue;
break;
case '-':
if (matches_spec(from, f->f_host + 1,
strcasestr))
continue;
break;
}
}
/* skip messages with the incorrect program name */
if (f->f_program != NULL) {
switch (f->f_program[0]) {
case '+':
if (! matches_spec(prog, f->f_program + 1,
strstr))
continue;
break;
case '-':
if (matches_spec(prog, f->f_program + 1,
strstr))
continue;
break;
default:
if (! matches_spec(prog, f->f_program,
strstr))
continue;
break;
}
}
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 unless NoRepeat
*/
if ((flags & MARK) == 0 && msglen == f->f_prevlen &&
!NoRepeat &&
!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));
if (msglen < MAXSVLINE) {
f->f_prevlen = msglen;
(void)strlcpy(f->f_prevline, msg,
sizeof(f->f_prevline));
fprintlog(f, flags, (char *)NULL);
} else {
f->f_prevline[0] = 0;
f->f_prevlen = 0;
fprintlog(f, flags, msg);
}
}
}
(void)sigsetmask(omask);
}
void
fprintlog(struct filed *f, int flags, char *msg)
{
struct iovec iov[10];
struct iovec *v;
struct addrinfo *r;
int j, l, lsent;
char line[MAXLINE + 1], repbuf[80], greetings[200];
#define ADDEV() assert(++v - iov < A_CNT(iov))
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));
ADDEV();
v->iov_base = "";
v->iov_len = 0;
ADDEV();
} else {
v->iov_base = f->f_lasttime;
v->iov_len = 15;
ADDEV();
v->iov_base = " ";
v->iov_len = 1;
ADDEV();
}
if (LogFacPri) {
static char fp_buf[30];
const char *f_s = NULL, *p_s = NULL;
int fac = f->f_prevpri & LOG_FACMASK;
int pri = LOG_PRI(f->f_prevpri);
char f_n[5], p_n[5];
if (LogFacPri > 1) {
CODE *c;
for (c = facilitynames; c->c_name != NULL; c++) {
if (c->c_val == fac) {
f_s = c->c_name;
break;
}
}
for (c = prioritynames; c->c_name != NULL; c++) {
if (c->c_val == pri) {
p_s = c->c_name;
break;
}
}
}
if (f_s == NULL) {
snprintf(f_n, sizeof(f_n), "%d", LOG_FAC(fac));
f_s = f_n;
}
if (p_s == NULL) {
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;
}
ADDEV();
v->iov_base = f->f_prevhost;
v->iov_len = strlen(v->iov_base);
ADDEV();
v->iov_base = " ";
v->iov_len = 1;
ADDEV();
if (msg) {
v->iov_base = msg;
v->iov_len = strlen(msg);
} else if (f->f_prevcount > 1) {
v->iov_base = repbuf;
v->iov_len = snprintf(repbuf, sizeof repbuf,
"last message repeated %d times", f->f_prevcount);
} else {
v->iov_base = f->f_prevline;
v->iov_len = f->f_prevlen;
}
ADDEV();
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
* (from FreeBSD PR#bin/7055)
*/
if (strcasecmp(f->f_prevhost, LocalHostName)) {
l = snprintf(line, sizeof(line) - 1,
"<%d>%.15s [%s]: %s",
f->f_prevpri, (char *) iov[0].iov_base,
f->f_prevhost, (char *) iov[5].iov_base);
} else {
l = snprintf(line, sizeof(line) - 1, "<%d>%.15s %s",
f->f_prevpri, (char *) iov[0].iov_base,
(char *) iov[5].iov_base);
}
if (l > MAXLINE)
l = MAXLINE;
if (finet) {
for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
for (j = 0; j < *finet; j++) {
#if 0
/*
* should we check AF first, or just
* trial and error? FWD
*/
if (r->ai_family ==
address_family_of(finet[j+1]))
#endif
lsent = sendto(finet[j+1], line, l, 0,
r->ai_addr, r->ai_addrlen);
if (lsent == l)
break;
}
}
if (lsent != l) {
f->f_type = F_UNUSED;
logerror("sendto() failed");
}
}
break;
case F_PIPE:
dprintf(" %s\n", f->f_un.f_pipe.f_pname);
v->iov_base = "\n";
v->iov_len = 1;
ADDEV();
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, v - iov) < 0) {
int e = errno;
if (f->f_un.f_pipe.f_pid > 0) {
(void) close(f->f_file);
deadq_enter(f->f_un.f_pipe.f_pid,
f->f_un.f_pipe.f_pname);
}
f->f_un.f_pipe.f_pid = 0;
/*
* If the error was EPIPE, then what is likely
* has happened is we have a command that is
* designed to take a single message line and
* then exit, but we tried to feed it another
* one before we reaped the child and thus
* reset our state.
*
* Well, now we've reset our state, so try opening
* the pipe and sending the message again if EPIPE
* was the error.
*/
if (e == EPIPE) {
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, v - iov) < 0) {
e = errno;
if (f->f_un.f_pipe.f_pid > 0) {
(void) close(f->f_file);
deadq_enter(f->f_un.f_pipe.f_pid,
f->f_un.f_pipe.f_pname);
}
f->f_un.f_pipe.f_pid = 0;
} else
e = 0;
}
if (e != 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:
case F_FILE:
dprintf(" %s\n", f->f_un.f_fname);
if (f->f_type != F_FILE) {
v->iov_base = "\r\n";
v->iov_len = 2;
} else {
v->iov_base = "\n";
v->iov_len = 1;
}
ADDEV();
again:
if (writev(f->f_file, iov, v - iov) < 0) {
int e = errno;
if (f->f_type == F_FILE && e == ENOSPC) {
int lasterror = f->f_lasterror;
f->f_lasterror = e;
if (lasterror != e)
logerror(f->f_un.f_fname);
break;
}
(void)close(f->f_file);
/*
* Check for errors on TTY's due to loss of tty
*/
if ((e == EIO || e == EBADF) && f->f_type != F_FILE) {
f->f_file = open(f->f_un.f_fname,
O_WRONLY|O_APPEND, 0);
if (f->f_file < 0) {
f->f_type = F_UNUSED;
logerror(f->f_un.f_fname);
} else
goto again;
} else {
f->f_type = F_UNUSED;
errno = e;
f->f_lasterror = e;
logerror(f->f_un.f_fname);
}
} else {
f->f_lasterror = 0;
if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC))
(void)fsync(f->f_file);
}
break;
case F_USERS:
case F_WALL:
dprintf("\n");
v->iov_base = "\r\n";
v->iov_len = 2;
ADDEV();
wallmsg(f, iov, v - 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(struct filed *f, struct iovec *iov, size_t iovcnt)
{
static int reenter; /* avoid calling ourselves */
int i;
char *p;
static struct utmpentry *ohead = NULL;
struct utmpentry *ep;
if (reenter++)
return;
(void)getutentries(NULL, &ep);
if (ep != ohead) {
freeutentries(ohead);
ohead = ep;
}
/* NOSTRICT */
for (; ep; ep = ep->next) {
if (f->f_type == F_WALL) {
if ((p = ttymsg(iov, iovcnt, ep->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 (strcmp(f->f_un.f_uname[i], ep->name) == 0) {
if ((p = ttymsg(iov, iovcnt, ep->line,
TTYMSGTIME)) != NULL) {
errno = 0; /* already in msg */
logerror(p);
}
break;
}
}
}
reenter = 0;
}
void
reapchild(struct kevent *ev)
{
int status;
pid_t pid;
struct filed *f;
while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
if (!Initialized || ShuttingDown) {
/*
* Be silent while we are initializing or
* shutting down.
*/
continue;
}
if (deadq_remove(pid))
continue;
/* Now, look in the list of active processes. */
for (f = Files; f != NULL; 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;
}
}
}
}
/*
* Return a printable representation of a host address.
*/
char *
cvthname(struct sockaddr_storage *f)
{
int error;
const int niflag = NI_DGRAM;
static char host[NI_MAXHOST], ip[NI_MAXHOST];
error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len,
ip, sizeof ip, NULL, 0, NI_NUMERICHOST|niflag);
dprintf("cvthname(%s)\n", ip);
if (error) {
dprintf("Malformed from address %s\n", gai_strerror(error));
return ("???");
}
if (!UseNameService)
return (ip);
error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len,
host, sizeof host, NULL, 0, niflag);
if (error) {
dprintf("Host name for your address (%s) unknown\n", ip);
return (ip);
}
trim_localdomain(host);
return (host);
}
void
trim_localdomain(char *host)
{
size_t hl;
hl = strlen(host);
if (hl > 0 && host[hl - 1] == '.')
host[--hl] = '\0';
if (hl > LocalDomainLen && host[hl - LocalDomainLen - 1] == '.' &&
strcasecmp(&host[hl - LocalDomainLen], LocalDomain) == 0)
host[hl - LocalDomainLen - 1] = '\0';
}
void
domark(struct kevent *ev)
{
struct filed *f;
dq_t q, nextq;
/*
* XXX Should we bother to adjust for the # of times the timer
* has expired (i.e. in case we miss one?). This information is
* returned to us in ev->data.
*/
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 = nextq) {
nextq = 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 the 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);
break;
}
/* FALLTHROUGH */
default:
q->dq_timeout--;
}
}
}
/*
* Print syslogd errors some place.
*/
void
logerror(const char *fmt, ...)
{
static int logerror_running;
va_list ap;
char tmpbuf[BUFSIZ];
char buf[BUFSIZ];
/* If there's an error while trying to log an error, give up. */
if (logerror_running)
return;
logerror_running = 1;
va_start(ap, fmt);
(void)vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap);
va_end(ap);
if (errno)
(void)snprintf(buf, sizeof(buf), "syslogd: %s: %s",
tmpbuf, strerror(errno));
else
(void)snprintf(buf, sizeof(buf), "syslogd: %s", tmpbuf);
if (daemonized)
logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
if (!daemonized && Debug)
dprintf("%s\n", buf);
if (!daemonized && !Debug)
printf("%s\n", buf);
logerror_running = 0;
}
void
die(struct kevent *ev)
{
struct filed *f;
char **p;
ShuttingDown = 1; /* 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 && f->f_un.f_pipe.f_pid > 0) {
(void) close(f->f_file);
f->f_un.f_pipe.f_pid = 0;
}
}
errno = 0;
if (ev != NULL)
logerror("Exiting on signal %d", (int) ev->ident);
else
logerror("Fatal error, exiting");
for (p = LogPaths; p && *p; p++)
unlink(*p);
exit(0);
}
/*
* INIT -- Initialize syslogd from configuration table
*/
void
init(struct kevent *ev)
{
int i;
FILE *cf;
struct filed *f, *next, **nextp;
char *p;
char cline[LINE_MAX];
char prog[NAME_MAX + 1];
char host[MAXHOSTNAMELEN];
char hostMsg[2*MAXHOSTNAMELEN + 40];
dprintf("init\n");
(void)strlcpy(oldLocalHostName, LocalHostName,
sizeof(oldLocalHostName));
(void)gethostname(LocalHostName, sizeof(LocalHostName));
if ((p = strchr(LocalHostName, '.')) != NULL) {
*p++ = '\0';
LocalDomain = p;
} else
LocalDomain = "";
LocalDomainLen = strlen(LocalDomain);
/*
* 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_TTY:
case F_CONSOLE:
(void)close(f->f_file);
break;
case F_PIPE:
if (f->f_un.f_pipe.f_pid > 0) {
(void)close(f->f_file);
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;
case F_FORW:
if (f->f_un.f_forw.f_addr)
freeaddrinfo(f->f_un.f_forw.f_addr);
break;
}
next = f->f_next;
if (f->f_program != NULL)
free(f->f_program);
if (f->f_host != NULL)
free(f->f_host);
free((char *)f);
}
Files = NULL;
nextp = &Files;
/*
* Close all open sockets
*/
if (finet) {
for (i = 0; i < *finet; i++) {
if (close(finet[i+1]) < 0) {
logerror("close() failed");
die(NULL);
}
}
}
/*
* Reset counter of forwarding actions
*/
NumForwards=0;
/* 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(prog, "*");
strcpy(host, "*");
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((unsigned char)*p); ++p)
continue;
if (*p == '\0')
continue;
if (*p == '#') {
p++;
if (*p != '!' && *p != '+' && *p != '-')
continue;
}
if (*p == '+' || *p == '-') {
host[0] = *p++;
while (isspace((unsigned char)*p))
p++;
if (*p == '\0' || *p == '*') {
strcpy(host, "*");
continue;
}
if (*p == '@')
p = LocalHostName;
for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
if (!isalnum((unsigned char)*p) &&
*p != '.' && *p != '-' && *p != ',')
break;
host[i] = *p++;
}
host[i] = '\0';
continue;
}
if (*p == '!') {
p++;
while (isspace((unsigned char)*p))
p++;
if (*p == '\0' || *p == '*') {
strcpy(prog, "*");
continue;
}
for (i = 0; i < NAME_MAX; i++) {
if (!isprint((unsigned char)p[i]))
break;
prog[i] = p[i];
}
prog[i] = '\0';
continue;
}
for (p = strchr(cline, '\0'); isspace((unsigned char)*--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:
case F_TTY:
case F_CONSOLE:
printf("%s", 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 != NULL)
printf(" (%s)", f->f_program);
printf("\n");
}
}
finet = socksetup(PF_UNSPEC);
if (finet) {
if (SecureMode) {
for (i = 0; i < *finet; i++) {
if (shutdown(finet[i+1], SHUT_RD) < 0) {
logerror("shutdown() failed");
die(NULL);
}
}
} else
dprintf("Listening on inet and/or inet6 socket\n");
dprintf("Sending on inet and/or inet6 socket\n");
}
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
dprintf("syslogd: restarted\n");
/*
* Log a change in hostname, but only on a restart (we detect this
* by checking to see if we're passed a kevent).
*/
if (ev != NULL && strcmp(oldLocalHostName, LocalHostName) != 0) {
(void)snprintf(hostMsg, sizeof(hostMsg),
"syslogd: host name changed, \"%s\" to \"%s\"",
oldLocalHostName, LocalHostName);
logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
dprintf("%s\n", hostMsg);
}
}
/*
* Crack a configuration file line
*/
void
cfline(char *line, struct filed *f, char *prog, char *host)
{
struct addrinfo hints, *res;
int error, i, pri, syncfile;
char *bp, *p, *q;
char buf[MAXLINE];
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;
/*
* There should not be any space before the log facility.
* Check this is okay, complain and fix if it is not.
*/
q = line;
if (isblank((unsigned char)*line)) {
errno = 0;
logerror(
"Warning: `%s' space or tab before the log facility",
line);
/* Fix: strip all spaces/tabs before the log facility */
while (*q++ && isblank((unsigned char)*q))
/* skip blanks */;
line = q;
}
/*
* q is now at the first char of the log facility
* There should be at least one tab after the log facility
* Check this is okay, and complain and fix if it is not.
*/
q = line + strlen(line);
while (!isblank((unsigned char)*q) && (q != line))
q--;
if ((q == line) && strlen(line)) {
/* No tabs or space in a non empty line: complain */
errno = 0;
logerror(
"Error: `%s' log facility or log target missing",
line);
return;
}
/* save host name, if any */
if (*host == '*')
f->f_host = NULL;
else {
f->f_host = strdup(host);
trim_localdomain(f->f_host);
}
/* save program name, if any */
if (*prog == '*')
f->f_program = NULL;
else
f->f_program = strdup(prog);
/* scan through the list of selectors */
for (p = line; *p && !isblank((unsigned char)*p);) {
int pri_done, pri_cmp, pri_invert;
/* find the end of this facility name list */
for (q = p; *q && !isblank((unsigned char)*q) && *q++ != '.'; )
continue;
/* get the priority comparison */
pri_cmp = 0;
pri_done = 0;
pri_invert = 0;
if (*q == '!') {
pri_invert = 1;
q++;
}
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 = 1;
break;
}
}
/* 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;
pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
} else {
pri = decode(buf, prioritynames);
if (pri < 0) {
errno = 0;
logerror("Unknown priority name `%s'", buf);
return;
}
}
if (pri_cmp == 0)
pri_cmp = UniquePriority ? PRI_EQ
: PRI_EQ | PRI_GT;
if (pri_invert)
pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
/* 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) {
errno = 0;
logerror("Unknown facility name `%s'",
buf);
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 (isblank((unsigned char)*p))
p++;
if (*p == '-') {
syncfile = 0;
p++;
} else
syncfile = 1;
switch (*p) {
case '@':
(void)strlcpy(f->f_un.f_forw.f_hname, ++p,
sizeof(f->f_un.f_forw.f_hname));
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = 0;
error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints,
&res);
if (error) {
logerror(gai_strerror(error));
break;
}
f->f_un.f_forw.f_addr = res;
f->f_type = F_FORW;
NumForwards++;
break;
case '/':
(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
f->f_type = F_UNUSED;
logerror(p);
break;
}
if (syncfile)
f->f_flags |= FFLAG_SYNC;
if (isatty(f->f_file))
f->f_type = F_TTY;
else
f->f_type = F_FILE;
if (strcmp(p, ctty) == 0)
f->f_type = F_CONSOLE;
break;
case '|':
f->f_un.f_pipe.f_pid = 0;
(void) strlcpy(f->f_un.f_pipe.f_pname, p + 1,
sizeof(f->f_un.f_pipe.f_pname));
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(const char *name, CODE *codetab)
{
CODE *c;
char *p, buf[40];
if (isdigit((unsigned char)*name))
return (atoi(name));
for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
if (isupper((unsigned char)*name))
*p = tolower((unsigned char)*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);
}
/*
* Retrieve the size of the kernel message buffer, via sysctl.
*/
int
getmsgbufsize(void)
{
int msgbufsize, mib[2];
size_t size;
mib[0] = CTL_KERN;
mib[1] = KERN_MSGBUFSIZE;
size = sizeof msgbufsize;
if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) {
dprintf("Couldn't get kern.msgbufsize\n");
return (0);
}
return (msgbufsize);
}
int *
socksetup(int af)
{
struct addrinfo hints, *res, *r;
struct kevent *ev;
int error, maxs, *s, *socks;
const int on = 1;
if(SecureMode && !NumForwards)
return(NULL);
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = af;
hints.ai_socktype = SOCK_DGRAM;
error = getaddrinfo(NULL, "syslog", &hints, &res);
if (error) {
logerror(gai_strerror(error));
errno = 0;
die(NULL);
}
/* Count max number of sockets we may open */
for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
continue;
socks = malloc((maxs+1) * sizeof(int));
if (!socks) {
logerror("Couldn't allocate memory for sockets");
die(NULL);
}
*socks = 0; /* num of sockets counter at start of array */
s = socks + 1;
for (r = res; r; r = r->ai_next) {
*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
if (*s < 0) {
logerror("socket() failed");
continue;
}
if (r->ai_family == AF_INET6 && setsockopt(*s, IPPROTO_IPV6,
IPV6_V6ONLY, &on, sizeof(on)) < 0) {
logerror("setsockopt(IPV6_V6ONLY) failed");
close(*s);
continue;
}
if (!SecureMode) {
if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
logerror("bind() failed");
close(*s);
continue;
}
ev = allocevchange();
EV_SET(ev, *s, EVFILT_READ, EV_ADD | EV_ENABLE,
0, 0, (intptr_t) dispatch_read_finet);
}
*socks = *socks + 1;
s++;
}
if (*socks == 0) {
free (socks);
if(Debug)
return(NULL);
else
die(NULL);
}
if (res)
freeaddrinfo(res);
return(socks);
}
/*
* Fairly similar to popen(3), but returns an open descriptor, as opposed
* to a FILE *.
*/
int
p_open(char *prog, pid_t *rpid)
{
int pfd[2], nulldesc, i;
pid_t pid;
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);
}
switch ((pid = fork())) {
case -1:
(void) close(nulldesc);
return (-1);
case 0:
argv[0] = "sh";
argv[1] = "-c";
argv[2] = prog;
argv[3] = NULL;
(void) setsid(); /* avoid catching SIGHUPs. */
/*
* Reset ignored signals to their default behavior.
*/
(void)signal(SIGTERM, SIG_DFL);
(void)signal(SIGINT, SIG_DFL);
(void)signal(SIGQUIT, SIG_DFL);
(void)signal(SIGPIPE, SIG_DFL);
(void)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);
}
(void) close(nulldesc);
(void) 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.
*/
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.", (int) pid);
logerror(errmsg);
}
*rpid = pid;
return (pfd[1]);
}
void
deadq_enter(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(*p));
if (p == NULL) {
errno = 0;
logerror("panic: out of 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_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_t pid, int status, const char *name)
{
int code;
char buf[256];
const char *reason;
/* Keep strerror() struff out of logerror messages. */
errno = 0;
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);
}
static struct kevent changebuf[8];
static int nchanges;
static struct kevent *
allocevchange(void)
{
if (nchanges == A_CNT(changebuf)) {
/* XXX Error handling could be improved. */
(void) wait_for_events(NULL, 0);
}
return (&changebuf[nchanges++]);
}
static int
wait_for_events(struct kevent *events, size_t nevents)
{
int rv;
rv = kevent(fkq, nchanges ? changebuf : NULL, nchanges,
events, nevents, NULL);
nchanges = 0;
return (rv);
}
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