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b96fc19739
freebsd/usr.sbin/syslogd/syslogd.c
Maxim Sobolev 023653459a Fix another logic bug that came out of recent syslogd refactoring and exposed by 
the r316874: don't call shutdown(2) on all sockets, but only net ones, which seems
to be the behaviour existed before that refactoring. Also don't call listen(2)
in datagram sockets and fix misplaced debug messages while I am here.

Reported by: peter
2017-04-15 18:20:11 +00:00

3051 lines
69 KiB
C
Raw Blame History

/*
* 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.
*/
#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
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* 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 maximum 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.
*/
/* Maximum number of characters in time of last occurrence */
#define MAXDATELEN 16
#define MAXLINE 1024 /* maximum line length */
#define MAXSVLINE MAXLINE /* 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 /* timeout passed to ttymsg */
#define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syslimits.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/wait.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#include <netdb.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <libutil.h>
#include <limits.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <utmpx.h>
#include "pathnames.h"
#include "ttymsg.h"
#define SYSLOG_NAMES
#include <sys/syslog.h>
static const char *ConfFile = _PATH_LOGCONF;
static const char *PidFile = _PATH_LOGPID;
static const char ctty[] = _PATH_CONSOLE;
static const char include_str[] = "include";
static const char include_ext[] = ".conf";
#define dprintf if (Debug) printf
#define MAXUNAMES 20 /* maximum number of user names */
#define sstosa(ss) ((struct sockaddr *)(ss))
#ifdef INET
#define sstosin(ss) ((struct sockaddr_in *)(void *)(ss))
#define satosin(sa) ((struct sockaddr_in *)(void *)(sa))
#endif
#ifdef INET6
#define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss))
#define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa))
#define s6_addr32 __u6_addr.__u6_addr32
#define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
(((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \
(((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \
(((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \
(((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 )
#endif
/*
* List of peers and sockets for binding.
*/
struct peer {
const char *pe_name;
const char *pe_serv;
mode_t pe_mode;
STAILQ_ENTRY(peer) next;
};
static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue);
struct socklist {
struct sockaddr_storage sl_ss;
int sl_socket;
struct peer *sl_peer;
int (*sl_recv)(struct socklist *);
STAILQ_ENTRY(socklist) next;
};
static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead);
/*
* 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 if F_PIPE and f_pid > 0.
*/
struct filed {
STAILQ_ENTRY(filed) 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][MAXLOGNAME];
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;
#define fu_uname f_un.f_uname
#define fu_forw_hname f_un.f_forw.f_hname
#define fu_forw_addr f_un.f_forw.f_addr
#define fu_fname f_un.f_fname
#define fu_pipe_pname f_un.f_pipe.f_pname
#define fu_pipe_pid f_un.f_pipe.f_pid
char f_prevline[MAXSVLINE]; /* last message logged */
char f_lasttime[MAXDATELEN]; /* 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 */
u_int f_repeatcount; /* number of "repeated" msgs */
int f_flags; /* file-specific flags */
#define FFLAG_SYNC 0x01
#define FFLAG_NEEDSYNC 0x02
};
/*
* Queue of about-to-be dead processes we should watch out for.
*/
struct deadq_entry {
pid_t dq_pid;
int dq_timeout;
TAILQ_ENTRY(deadq_entry) dq_entries;
};
static TAILQ_HEAD(, deadq_entry) deadq_head =
TAILQ_HEAD_INITIALIZER(deadq_head);
/*
* 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
/*
* Struct to hold records of network addresses that are allowed to log
* to us.
*/
struct allowedpeer {
int isnumeric;
u_short port;
union {
struct {
struct sockaddr_storage addr;
struct sockaddr_storage mask;
} numeric;
char *name;
} u;
#define a_addr u.numeric.addr
#define a_mask u.numeric.mask
#define a_name u.name
STAILQ_ENTRY(allowedpeer) next;
};
static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead);
/*
* 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.
*/
static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
#define MAXREPEAT (nitems(repeatinterval) - 1)
#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount])
#define BACKOFF(f) do { \
if (++(f)->f_repeatcount > MAXREPEAT) \
(f)->f_repeatcount = MAXREPEAT; \
} while (0)
/* 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 */
static const char *TypeNames[] = {
"UNUSED", "FILE", "TTY", "CONSOLE",
"FORW", "USERS", "WALL", "PIPE"
};
static STAILQ_HEAD(, filed) fhead =
STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */
static struct filed consfile; /* Console */
static int Debug; /* debug flag */
static int Foreground = 0; /* Run in foreground, instead of daemonizing */
static int resolve = 1; /* resolve hostname */
static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */
static const char *LocalDomain; /* our local domain name */
static int Initialized; /* set when we have initialized ourselves */
static int MarkInterval = 20 * 60; /* interval between marks in seconds */
static int MarkSeq; /* mark sequence number */
static int NoBind; /* don't bind() as suggested by RFC 3164 */
static int SecureMode; /* when true, receive only unix domain socks */
#ifdef INET6
static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
#else
static int family = PF_INET; /* protocol family (IPv4 only) */
#endif
static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */
static int send_to_all; /* send message to all IPv4/IPv6 addresses */
static int use_bootfile; /* log entire bootfile for every kern msg */
static int no_compress; /* don't compress messages (1=pipes, 2=all) */
static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
static char bootfile[MAXLINE+1]; /* booted kernel file */
static int RemoteAddDate; /* Always set the date on remote messages */
static int UniquePriority; /* Only log specified priority? */
static int LogFacPri; /* Put facility and priority in log message: */
/* 0=no, 1=numeric, 2=names */
static int KeepKernFac; /* Keep remotely logged kernel facility */
static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
static struct pidfh *pfh;
static int sigpipe[2]; /* Pipe to catch a signal during select(). */
static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild;
static int allowaddr(char *);
static int addfile(struct filed *);
static int addpeer(struct peer *);
static int addsock(struct sockaddr *, socklen_t, struct socklist *);
static struct filed *cfline(const char *, const char *, const char *);
static const char *cvthname(struct sockaddr *);
static void deadq_enter(pid_t, const char *);
static int deadq_remove(struct deadq_entry *);
static int deadq_removebypid(pid_t);
static int decode(const char *, const CODE *);
static void die(int) __dead2;
static void dodie(int);
static void dofsync(void);
static void domark(int);
static void fprintlog(struct filed *, int, const char *);
static void init(int);
static void logerror(const char *);
static void logmsg(int, const char *, const char *, int);
static void log_deadchild(pid_t, int, const char *);
static void markit(void);
static int socksetup(struct peer *);
static int socklist_recv_file(struct socklist *);
static int socklist_recv_sock(struct socklist *);
static int socklist_recv_signal(struct socklist *);
static void sighandler(int);
static int skip_message(const char *, const char *, int);
static void printline(const char *, char *, int);
static void printsys(char *);
static int p_open(const char *, pid_t *);
static void reapchild(int);
static const char *ttymsg_check(struct iovec *, int, char *, int);
static void usage(void);
static int validate(struct sockaddr *, const char *);
static void unmapped(struct sockaddr *);
static void wallmsg(struct filed *, struct iovec *, const int iovlen);
static int waitdaemon(int);
static void timedout(int);
static void increase_rcvbuf(int);
static void
close_filed(struct filed *f)
{
if (f == NULL || f->f_file == -1)
return;
switch (f->f_type) {
case F_FILE:
case F_TTY:
case F_CONSOLE:
case F_FORW:
f->f_type = F_UNUSED;
break;
case F_PIPE:
f->fu_pipe_pid = 0;
break;
}
(void)close(f->f_file);
f->f_file = -1;
}
static int
addfile(struct filed *f0)
{
struct filed *f;
f = calloc(1, sizeof(*f));
if (f == NULL)
err(1, "malloc failed");
*f = *f0;
STAILQ_INSERT_TAIL(&fhead, f, next);
return (0);
}
static int
addpeer(struct peer *pe0)
{
struct peer *pe;
pe = calloc(1, sizeof(*pe));
if (pe == NULL)
err(1, "malloc failed");
*pe = *pe0;
STAILQ_INSERT_TAIL(&pqueue, pe, next);
return (0);
}
static int
addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0)
{
struct socklist *sl;
sl = calloc(1, sizeof(*sl));
if (sl == NULL)
err(1, "malloc failed");
*sl = *sl0;
if (sa != NULL && sa_len > 0)
memcpy(&sl->sl_ss, sa, sa_len);
STAILQ_INSERT_TAIL(&shead, sl, next);
return (0);
}
int
main(int argc, char *argv[])
{
int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0;
fd_set *fdsr = NULL;
struct timeval tv, *tvp;
struct peer *pe;
struct socklist *sl;
pid_t ppid = 1, spid;
char *p;
if (madvise(NULL, 0, MADV_PROTECT) != 0)
dprintf("madvise() failed: %s\n", strerror(errno));
while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv"))
!= -1)
switch (ch) {
#ifdef INET
case '4':
family = PF_INET;
break;
#endif
#ifdef INET6
case '6':
family = PF_INET6;
break;
#endif
case '8':
mask_C1 = 0;
break;
case 'A':
send_to_all++;
break;
case 'a': /* allow specific network addresses only */
if (allowaddr(optarg) == -1)
usage();
break;
case 'b':
bflag = 1;
p = strchr(optarg, ']');
if (p != NULL)
p = strchr(p + 1, ':');
else {
p = strchr(optarg, ':');
if (p != NULL && strchr(p + 1, ':') != NULL)
p = NULL; /* backward compatibility */
}
if (p == NULL) {
/* A hostname or filename only. */
addpeer(&(struct peer){
.pe_name = optarg,
.pe_serv = "syslog"
});
} else {
/* The case of "name:service". */
*p++ = '\0';
addpeer(&(struct peer){
.pe_serv = p,
.pe_name = (strlen(optarg) == 0) ?
NULL : optarg,
});
}
break;
case 'c':
no_compress++;
break;
case 'C':
logflags |= O_CREAT;
break;
case 'd': /* debug */
Debug++;
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'F': /* run in foreground instead of daemon */
Foreground++;
break;
case 'k': /* keep remote kern fac */
KeepKernFac = 1;
break;
case 'l':
case 'p':
case 'S':
{
long perml;
mode_t mode;
char *name, *ep;
if (ch == 'l')
mode = DEFFILEMODE;
else if (ch == 'p') {
mode = DEFFILEMODE;
pflag = 1;
} else if (ch == 'S') {
mode = S_IRUSR | S_IWUSR;
Sflag = 1;
}
if (optarg[0] == '/')
name = optarg;
else if ((name = strchr(optarg, ':')) != NULL) {
*name++ = '\0';
if (name[0] != '/')
errx(1, "socket name must be absolute "
"path");
if (isdigit(*optarg)) {
perml = strtol(optarg, &ep, 8);
if (*ep || perml < 0 ||
perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
errx(1, "invalid mode %s, exiting",
optarg);
mode = (mode_t )perml;
} else
errx(1, "invalid mode %s, exiting",
optarg);
} else
errx(1, "invalid filename %s, exiting",
optarg);
addpeer(&(struct peer){
.pe_name = name,
.pe_mode = mode
});
break;
}
case 'm': /* mark interval */
MarkInterval = atoi(optarg) * 60;
break;
case 'N':
NoBind = 1;
SecureMode = 1;
break;
case 'n':
resolve = 0;
break;
case 'o':
use_bootfile = 1;
break;
case 'P': /* path for alt. PID */
PidFile = optarg;
break;
case 's': /* no network mode */
SecureMode++;
break;
case 'T':
RemoteAddDate = 1;
break;
case 'u': /* only log specified priority */
UniquePriority++;
break;
case 'v': /* log facility and priority */
LogFacPri++;
break;
default:
usage();
}
if ((argc -= optind) != 0)
usage();
/* Pipe to catch a signal during select(). */
s = pipe2(sigpipe, O_CLOEXEC);
if (s < 0) {
err(1, "cannot open a pipe for signals");
} else {
addsock(NULL, 0, &(struct socklist){
.sl_socket = sigpipe[0],
.sl_recv = socklist_recv_signal
});
}
/* Listen by default: /dev/klog. */
s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0);
if (s < 0) {
dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
} else {
addsock(NULL, 0, &(struct socklist){
.sl_socket = s,
.sl_recv = socklist_recv_file,
});
}
/* Listen by default: *:514 if no -b flag. */
if (bflag == 0)
addpeer(&(struct peer){
.pe_serv = "syslog"
});
/* Listen by default: /var/run/log if no -p flag. */
if (pflag == 0)
addpeer(&(struct peer){
.pe_name = _PATH_LOG,
.pe_mode = DEFFILEMODE,
});
/* Listen by default: /var/run/logpriv if no -S flag. */
if (Sflag == 0)
addpeer(&(struct peer){
.pe_name = _PATH_LOG_PRIV,
.pe_mode = S_IRUSR | S_IWUSR,
});
STAILQ_FOREACH(pe, &pqueue, next)
socksetup(pe);
pfh = pidfile_open(PidFile, 0600, &spid);
if (pfh == NULL) {
if (errno == EEXIST)
errx(1, "syslogd already running, pid: %d", spid);
warn("cannot open pid file");
}
if ((!Foreground) && (!Debug)) {
ppid = waitdaemon(30);
if (ppid < 0) {
warn("could not become daemon");
pidfile_remove(pfh);
exit(1);
}
} else if (Debug)
setlinebuf(stdout);
consfile.f_type = F_CONSOLE;
(void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1,
sizeof(consfile.fu_fname));
(void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
(void)signal(SIGTERM, dodie);
(void)signal(SIGINT, Debug ? dodie : SIG_IGN);
(void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
(void)signal(SIGHUP, sighandler);
(void)signal(SIGCHLD, sighandler);
(void)signal(SIGALRM, domark);
(void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
(void)alarm(TIMERINTVL);
/* tuck my process id away */
pidfile_write(pfh);
dprintf("off & running....\n");
tvp = &tv;
tv.tv_sec = tv.tv_usec = 0;
STAILQ_FOREACH(sl, &shead, next) {
if (sl->sl_socket > fdsrmax)
fdsrmax = sl->sl_socket;
}
fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
sizeof(fd_mask));
if (fdsr == NULL)
errx(1, "calloc fd_set");
for (;;) {
if (Initialized == 0)
init(0);
else if (WantInitialize)
init(WantInitialize);
if (WantReapchild)
reapchild(WantReapchild);
if (MarkSet)
markit();
if (WantDie) {
free(fdsr);
die(WantDie);
}
bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
sizeof(fd_mask));
STAILQ_FOREACH(sl, &shead, next) {
if (sl->sl_socket != -1 && sl->sl_recv != NULL)
FD_SET(sl->sl_socket, fdsr);
}
i = select(fdsrmax + 1, fdsr, NULL, NULL,
needdofsync ? &tv : tvp);
switch (i) {
case 0:
dofsync();
needdofsync = 0;
if (tvp) {
tvp = NULL;
if (ppid != 1)
kill(ppid, SIGALRM);
}
continue;
case -1:
if (errno != EINTR)
logerror("select");
continue;
}
STAILQ_FOREACH(sl, &shead, next) {
if (FD_ISSET(sl->sl_socket, fdsr))
(*sl->sl_recv)(sl);
}
}
free(fdsr);
}
static int
socklist_recv_signal(struct socklist *sl __unused)
{
ssize_t len;
int i, nsig, signo;
if (ioctl(sigpipe[0], FIONREAD, &i) != 0) {
logerror("ioctl(FIONREAD)");
err(1, "signal pipe read failed");
}
nsig = i / sizeof(signo);
dprintf("# of received signals = %d\n", nsig);
for (i = 0; i < nsig; i++) {
len = read(sigpipe[0], &signo, sizeof(signo));
if (len != sizeof(signo)) {
logerror("signal pipe read failed");
err(1, "signal pipe read failed");
}
dprintf("Received signal: %d from fd=%d\n", signo,
sigpipe[0]);
switch (signo) {
case SIGHUP:
WantInitialize = 1;
break;
case SIGCHLD:
WantReapchild = 1;
break;
}
}
return (0);
}
static int
socklist_recv_sock(struct socklist *sl)
{
struct sockaddr_storage ss;
struct sockaddr *sa = (struct sockaddr *)&ss;
socklen_t sslen;
const char *hname;
char line[MAXLINE + 1];
int date, len;
sslen = sizeof(ss);
len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen);
dprintf("received sa_len = %d\n", sslen);
if (len == 0)
return (-1);
if (len < 0) {
if (errno != EINTR)
logerror("recvfrom");
return (-1);
}
/* Received valid data. */
line[len] = '\0';
if (sl->sl_ss.ss_family == AF_LOCAL) {
hname = LocalHostName;
date = 0;
} else {
hname = cvthname(sa);
unmapped(sa);
if (validate(sa, hname) == 0)
hname = NULL;
date = RemoteAddDate ? ADDDATE : 0;
}
if (hname != NULL)
printline(hname, line, date);
else
dprintf("Invalid msg from %s was ignored.", hname);
return (0);
}
static void
unmapped(struct sockaddr *sa)
{
#if defined(INET) && defined(INET6)
struct sockaddr_in6 *sin6;
struct sockaddr_in sin;
if (sa == NULL ||
sa->sa_family != AF_INET6 ||
sa->sa_len != sizeof(*sin6))
return;
sin6 = satosin6(sa);
if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return;
sin = (struct sockaddr_in){
.sin_family = AF_INET,
.sin_len = sizeof(sin),
.sin_port = sin6->sin6_port
};
memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
sizeof(sin.sin_addr));
memcpy(sa, &sin, sizeof(sin));
#else
if (sa == NULL)
return;
#endif
}
static void
usage(void)
{
fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n",
"usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]",
" [-b bind_address] [-f config_file]",
" [-l [mode:]path] [-m mark_interval]",
" [-P pid_file] [-p log_socket]",
" [-S logpriv_socket]");
exit(1);
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
static void
printline(const char *hname, char *msg, int flags)
{
char *p, *q;
long n;
int c, pri;
char line[MAXLINE + 1];
/* test for special codes */
p = msg;
pri = DEFUPRI;
if (*p == '<') {
errno = 0;
n = strtol(p + 1, &q, 10);
if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
p = q + 1;
pri = 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 && !KeepKernFac)
pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
q = line;
while ((c = (unsigned char)*p++) != '\0' &&
q < &line[sizeof(line) - 4]) {
if (mask_C1 && (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, flags);
}
/*
* Read /dev/klog while data are available, split into lines.
*/
static int
socklist_recv_file(struct socklist *sl)
{
char *p, *q, line[MAXLINE + 1];
int len, i;
len = 0;
for (;;) {
i = read(sl->sl_socket, line + len, MAXLINE - 1 - len);
if (i > 0) {
line[i + len] = '\0';
} else {
if (i < 0 && errno != EINTR && errno != EAGAIN) {
logerror("klog");
close(sl->sl_socket);
sl->sl_socket = -1;
}
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);
return (len);
}
/*
* Take a raw input line from /dev/klog, format similar to syslog().
*/
static void
printsys(char *msg)
{
char *p, *q;
long n;
int flags, isprintf, pri;
flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
p = msg;
pri = DEFSPRI;
isprintf = 1;
if (*p == '<') {
errno = 0;
n = strtol(p + 1, &q, 10);
if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
p = q + 1;
pri = n;
isprintf = 0;
}
}
/*
* Kernel printf's and LOG_CONSOLE messages have been displayed
* on the console already.
*/
if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
flags |= IGN_CONS;
if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
pri = DEFSPRI;
logmsg(pri, p, LocalHostName, flags);
}
static time_t now;
/*
* Match a program or host name against a specification.
* Return a non-0 value if the message must be ignored
* based on the specification.
*/
static int
skip_message(const char *name, const char *spec, int checkcase)
{
const char *s;
char prev, next;
int exclude = 0;
/* Behaviour on explicit match */
if (spec == NULL)
return 0;
switch (*spec) {
case '-':
exclude = 1;
/*FALLTHROUGH*/
case '+':
spec++;
break;
default:
break;
}
if (checkcase)
s = strstr (spec, name);
else
s = strcasestr (spec, name);
if (s != NULL) {
prev = (s == spec ? ',' : *(s - 1));
next = *(s + strlen (name));
if (prev == ',' && (next == '\0' || next == ','))
/* Explicit match: skip iff the spec is an
exclusive one. */
return exclude;
}
/* No explicit match for this name: skip the message iff
the spec is an inclusive one. */
return !exclude;
}
/*
* Log a message to the appropriate log files, users, etc. based on
* the priority.
*/
static void
logmsg(int pri, const char *msg, const char *from, int flags)
{
struct filed *f;
int i, fac, msglen, prilev;
const 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);
/*
* Check to see if msg looks non-standard.
*/
msglen = strlen(msg);
if (msglen < MAXDATELEN || 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 += MAXDATELEN;
msglen -= MAXDATELEN;
}
/* skip leading blanks */
while (isspace(*msg)) {
msg++;
msglen--;
}
/* extract facility and priority level */
if (flags & MARK)
fac = LOG_NFACILITIES;
else
fac = LOG_FAC(pri);
/* Check maximum facility number. */
if (fac > LOG_NFACILITIES)
return;
prilev = LOG_PRI(pri);
/* extract program name */
for (i = 0; i < NAME_MAX; i++) {
if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
msg[i] == '/' || isspace(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",
use_bootfile ? bootfile : "kernel", msg);
msg = buf;
msglen = strlen(buf);
}
/* log the message to the particular outputs */
if (!Initialized) {
f = &consfile;
/*
* Open in non-blocking mode to avoid hangs during open
* and close(waiting for the port to drain).
*/
f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
if (f->f_file >= 0) {
(void)strlcpy(f->f_lasttime, timestamp,
sizeof(f->f_lasttime));
fprintlog(f, flags, msg);
close(f->f_file);
f->f_file = -1;
}
return;
}
STAILQ_FOREACH(f, &fhead, 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 (skip_message(from, f->f_host, 0))
continue;
/* skip messages with the incorrect program name */
if (skip_message(prog, f->f_program, 1))
continue;
/* skip message to console if it has already been printed */
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 (no_compress - (f->f_type != F_PIPE) < 1 &&
(flags & MARK) == 0 && msglen == f->f_prevlen &&
!strcmp(msg, f->f_prevline) &&
!strcasecmp(from, f->f_prevhost)) {
(void)strlcpy(f->f_lasttime, timestamp,
sizeof(f->f_lasttime));
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)strlcpy(f->f_lasttime, timestamp,
sizeof(f->f_lasttime));
(void)strlcpy(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);
}
}
}
}
static void
dofsync(void)
{
struct filed *f;
STAILQ_FOREACH(f, &fhead, next) {
if ((f->f_type == F_FILE) &&
(f->f_flags & FFLAG_NEEDSYNC)) {
f->f_flags &= ~FFLAG_NEEDSYNC;
(void)fsync(f->f_file);
}
}
}
#define IOV_SIZE 7
static void
fprintlog(struct filed *f, int flags, const char *msg)
{
struct iovec iov[IOV_SIZE];
struct addrinfo *r;
int l, lsent = 0;
char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
const char *msgret;
if (f->f_type == F_WALL) {
/* The time displayed is not synchornized with the other log
* destinations (like messages). Following fragment was using
* ctime(&now), which was updating the time every 30 sec.
* With f_lasttime, time is synchronized correctly.
*/
iov[0] = (struct iovec){
.iov_base = greetings,
.iov_len = snprintf(greetings, sizeof(greetings),
"\r\n\7Message from syslogd@%s "
"at %.24s ...\r\n",
f->f_prevhost, f->f_lasttime)
};
if (iov[0].iov_len >= sizeof(greetings))
iov[0].iov_len = sizeof(greetings) - 1;
iov[1] = (struct iovec){
.iov_base = nul,
.iov_len = 0
};
} else {
iov[0] = (struct iovec){
.iov_base = f->f_lasttime,
.iov_len = strlen(f->f_lasttime)
};
iov[1] = (struct iovec){
.iov_base = space,
.iov_len = 1
};
}
if (LogFacPri) {
static char fp_buf[30]; /* Hollow laugh */
int fac = f->f_prevpri & LOG_FACMASK;
int pri = LOG_PRI(f->f_prevpri);
const char *f_s = NULL;
char f_n[5]; /* Hollow laugh */
const char *p_s = NULL;
char p_n[5]; /* Hollow laugh */
if (LogFacPri > 1) {
const 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);
iov[2] = (struct iovec){
.iov_base = fp_buf,
.iov_len = strlen(fp_buf)
};
} else {
iov[2] = (struct iovec){
.iov_base = nul,
.iov_len = 0
};
}
iov[3] = (struct iovec){
.iov_base = f->f_prevhost,
.iov_len = strlen(f->f_prevhost)
};
iov[4] = (struct iovec){
.iov_base = space,
.iov_len = 1
};
if (msg) {
wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
if (wmsg == NULL) {
logerror("strdup");
exit(1);
}
iov[5] = (struct iovec){
.iov_base = wmsg,
.iov_len = strlen(msg)
};
} else if (f->f_prevcount > 1) {
iov[5] = (struct iovec){
.iov_base = repbuf,
.iov_len = snprintf(repbuf, sizeof(repbuf),
"last message repeated %d times", f->f_prevcount)
};
} else {
iov[5] = (struct iovec){
.iov_base = f->f_prevline,
.iov_len = f->f_prevlen
};
}
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", f->fu_forw_hname);
switch (f->fu_forw_addr->ai_addr->sa_family) {
#ifdef INET
case AF_INET:
dprintf(":%d\n",
ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port));
break;
#endif
#ifdef INET6
case AF_INET6:
dprintf(":%d\n",
ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port));
break;
#endif
default:
dprintf("\n");
}
/* 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, (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 < 0)
l = 0;
else if (l > MAXLINE)
l = MAXLINE;
for (r = f->fu_forw_addr; r; r = r->ai_next) {
struct socklist *sl;
STAILQ_FOREACH(sl, &shead, next) {
if (sl->sl_ss.ss_family == AF_LOCAL ||
sl->sl_ss.ss_family == AF_UNSPEC ||
sl->sl_socket < 0)
continue;
lsent = sendto(sl->sl_socket, line, l, 0,
r->ai_addr, r->ai_addrlen);
if (lsent == l)
break;
}
if (lsent == l && !send_to_all)
break;
}
dprintf("lsent/l: %d/%d\n", lsent, l);
if (lsent != l) {
int e = errno;
logerror("sendto");
errno = e;
switch (errno) {
case ENOBUFS:
case ENETDOWN:
case ENETUNREACH:
case EHOSTUNREACH:
case EHOSTDOWN:
case EADDRNOTAVAIL:
break;
/* case EBADF: */
/* case EACCES: */
/* case ENOTSOCK: */
/* case EFAULT: */
/* case EMSGSIZE: */
/* case EAGAIN: */
/* case ENOBUFS: */
/* case ECONNREFUSED: */
default:
dprintf("removing entry: errno=%d\n", e);
f->f_type = F_UNUSED;
break;
}
}
break;
case F_FILE:
dprintf(" %s\n", f->fu_fname);
iov[6] = (struct iovec){
.iov_base = lf,
.iov_len = 1
};
if (writev(f->f_file, iov, nitems(iov)) < 0) {
/*
* If writev(2) fails for potentially transient errors
* like the filesystem being full, ignore it.
* Otherwise remove this logfile from the list.
*/
if (errno != ENOSPC) {
int e = errno;
close_filed(f);
errno = e;
logerror(f->fu_fname);
}
} else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
f->f_flags |= FFLAG_NEEDSYNC;
needdofsync = 1;
}
break;
case F_PIPE:
dprintf(" %s\n", f->fu_pipe_pname);
iov[6] = (struct iovec){
.iov_base = lf,
.iov_len = 1
};
if (f->fu_pipe_pid == 0) {
if ((f->f_file = p_open(f->fu_pipe_pname,
&f->fu_pipe_pid)) < 0) {
logerror(f->fu_pipe_pname);
break;
}
}
if (writev(f->f_file, iov, nitems(iov)) < 0) {
int e = errno;
deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
close_filed(f);
errno = e;
logerror(f->fu_pipe_pname);
}
break;
case F_CONSOLE:
if (flags & IGN_CONS) {
dprintf(" (ignored)\n");
break;
}
/* FALLTHROUGH */
case F_TTY:
dprintf(" %s%s\n", _PATH_DEV, f->fu_fname);
iov[6] = (struct iovec){
.iov_base = crlf,
.iov_len = 2
};
errno = 0; /* ttymsg() only sometimes returns an errno */
if ((msgret = ttymsg(iov, nitems(iov), f->fu_fname, 10))) {
f->f_type = F_UNUSED;
logerror(msgret);
}
break;
case F_USERS:
case F_WALL:
dprintf("\n");
iov[6] = (struct iovec){
.iov_base = crlf,
.iov_len = 2
};
wallmsg(f, iov, nitems(iov));
break;
}
f->f_prevcount = 0;
free(wmsg);
}
/*
* WALLMSG -- Write a message to the world at large
*
* Write the specified message to either the entire
* world, or a list of approved users.
*/
static void
wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
{
static int reenter; /* avoid calling ourselves */
struct utmpx *ut;
int i;
const char *p;
if (reenter++)
return;
setutxent();
/* NOSTRICT */
while ((ut = getutxent()) != NULL) {
if (ut->ut_type != USER_PROCESS)
continue;
if (f->f_type == F_WALL) {
if ((p = ttymsg(iov, iovlen, ut->ut_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->fu_uname[i][0])
break;
if (!strcmp(f->fu_uname[i], ut->ut_user)) {
if ((p = ttymsg_check(iov, iovlen, ut->ut_line,
TTYMSGTIME)) != NULL) {
errno = 0; /* already in msg */
logerror(p);
}
break;
}
}
}
endutxent();
reenter = 0;
}
/*
* Wrapper routine for ttymsg() that checks the terminal for messages enabled.
*/
static const char *
ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout)
{
static char device[1024];
static char errbuf[1024];
struct stat sb;
(void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line);
if (stat(device, &sb) < 0) {
(void) snprintf(errbuf, sizeof(errbuf),
"%s: %s", device, strerror(errno));
return (errbuf);
}
if ((sb.st_mode & S_IWGRP) == 0)
/* Messages disabled. */
return (NULL);
return ttymsg(iov, iovcnt, line, tmout);
}
static void
reapchild(int signo __unused)
{
int status;
pid_t pid;
struct filed *f;
while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
/* First, look if it's a process from the dead queue. */
if (deadq_removebypid(pid))
continue;
/* Now, look in list of active processes. */
STAILQ_FOREACH(f, &fhead, next) {
if (f->f_type == F_PIPE &&
f->fu_pipe_pid == pid) {
close_filed(f);
log_deadchild(pid, status, f->fu_pipe_pname);
break;
}
}
}
WantReapchild = 0;
}
/*
* Return a printable representation of a host address.
*/
static const char *
cvthname(struct sockaddr *f)
{
int error, hl;
static char hname[NI_MAXHOST], ip[NI_MAXHOST];
dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len);
error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0,
NI_NUMERICHOST);
if (error) {
dprintf("Malformed from address %s\n", gai_strerror(error));
return ("???");
}
dprintf("cvthname(%s)\n", ip);
if (!resolve)
return (ip);
error = getnameinfo(f, f->sa_len, hname, sizeof(hname),
NULL, 0, NI_NAMEREQD);
if (error) {
dprintf("Host name for your address (%s) unknown\n", ip);
return (ip);
}
hl = strlen(hname);
if (hl > 0 && hname[hl-1] == '.')
hname[--hl] = '\0';
trimdomain(hname, hl);
return (hname);
}
static void
dodie(int signo)
{
WantDie = signo;
}
static void
domark(int signo __unused)
{
MarkSet = 1;
}
/*
* Print syslogd errors some place.
*/
static void
logerror(const char *type)
{
char buf[512];
static int recursed = 0;
/* If there's an error while trying to log an error, give up. */
if (recursed)
return;
recursed++;
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);
recursed--;
}
static void
die(int signo)
{
struct filed *f;
struct socklist *sl;
char buf[100];
STAILQ_FOREACH(f, &fhead, next) {
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
if (f->f_type == F_PIPE && f->fu_pipe_pid > 0)
close_filed(f);
}
if (signo) {
dprintf("syslogd: exiting on signal %d\n", signo);
(void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
errno = 0;
logerror(buf);
}
STAILQ_FOREACH(sl, &shead, next) {
if (sl->sl_ss.ss_family == AF_LOCAL)
unlink(sl->sl_peer->pe_name);
}
pidfile_remove(pfh);
exit(1);
}
static int
configfiles(const struct dirent *dp)
{
const char *p;
size_t ext_len;
if (dp->d_name[0] == '.')
return (0);
ext_len = sizeof(include_ext) -1;
if (dp->d_namlen <= ext_len)
return (0);
p = &dp->d_name[dp->d_namlen - ext_len];
if (strcmp(p, include_ext) != 0)
return (0);
return (1);
}
static void
readconfigfile(FILE *cf, int allow_includes)
{
FILE *cf2;
struct filed *f;
struct dirent **ent;
char cline[LINE_MAX];
char host[MAXHOSTNAMELEN];
char prog[LINE_MAX];
char file[MAXPATHLEN];
char *p, *tmp;
int i, nents;
size_t include_len;
/*
* Foreach line in the conf table, open that file.
*/
include_len = sizeof(include_str) -1;
(void)strlcpy(host, "*", sizeof(host));
(void)strlcpy(prog, "*", sizeof(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 (allow_includes &&
strncmp(p, include_str, include_len) == 0 &&
isspace(p[include_len])) {
p += include_len;
while (isspace(*p))
p++;
tmp = p;
while (*tmp != '\0' && !isspace(*tmp))
tmp++;
*tmp = '\0';
dprintf("Trying to include files in '%s'\n", p);
nents = scandir(p, &ent, configfiles, alphasort);
if (nents == -1) {
dprintf("Unable to open '%s': %s\n", p,
strerror(errno));
continue;
}
for (i = 0; i < nents; i++) {
if (snprintf(file, sizeof(file), "%s/%s", p,
ent[i]->d_name) >= (int)sizeof(file)) {
dprintf("ignoring path too long: "
"'%s/%s'\n", p, ent[i]->d_name);
free(ent[i]);
continue;
}
free(ent[i]);
cf2 = fopen(file, "r");
if (cf2 == NULL)
continue;
dprintf("reading %s\n", file);
readconfigfile(cf2, 0);
fclose(cf2);
}
free(ent);
continue;
}
if (*p == '#') {
p++;
if (*p != '!' && *p != '+' && *p != '-')
continue;
}
if (*p == '+' || *p == '-') {
host[0] = *p++;
while (isspace(*p))
p++;
if ((!*p) || (*p == '*')) {
(void)strlcpy(host, "*", sizeof(host));
continue;
}
if (*p == '@')
p = LocalHostName;
for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
if (!isalnum(*p) && *p != '.' && *p != '-'
&& *p != ',' && *p != ':' && *p != '%')
break;
host[i] = *p++;
}
host[i] = '\0';
continue;
}
if (*p == '!') {
p++;
while (isspace(*p)) p++;
if ((!*p) || (*p == '*')) {
(void)strlcpy(prog, "*", sizeof(prog));
continue;
}
for (i = 0; i < LINE_MAX - 1; i++) {
if (!isprint(p[i]) || isspace(p[i]))
break;
prog[i] = p[i];
}
prog[i] = 0;
continue;
}
for (p = cline + 1; *p != '\0'; p++) {
if (*p != '#')
continue;
if (*(p - 1) == '\\') {
strcpy(p - 1, p);
p--;
continue;
}
*p = '\0';
break;
}
for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
cline[i] = '\0';
f = cfline(cline, prog, host);
if (f != NULL)
addfile(f);
}
}
static void
sighandler(int signo)
{
/* Send an wake-up signal to the select() loop. */
write(sigpipe[1], &signo, sizeof(signo));
}
/*
* INIT -- Initialize syslogd from configuration table
*/
static void
init(int signo)
{
int i;
FILE *cf;
struct filed *f;
char *p;
char oldLocalHostName[MAXHOSTNAMELEN];
char hostMsg[2*MAXHOSTNAMELEN+40];
char bootfileMsg[LINE_MAX];
dprintf("init\n");
WantInitialize = 0;
/*
* Load hostname (may have changed).
*/
if (signo != 0)
(void)strlcpy(oldLocalHostName, LocalHostName,
sizeof(oldLocalHostName));
if (gethostname(LocalHostName, sizeof(LocalHostName)))
err(EX_OSERR, "gethostname() failed");
if ((p = strchr(LocalHostName, '.')) != NULL) {
*p++ = '\0';
LocalDomain = p;
} else {
LocalDomain = "";
}
/*
* Load / reload timezone data (in case it changed).
*
* Just calling tzset() again does not work, the timezone code
* caches the result. However, by setting the TZ variable, one
* can defeat the caching and have the timezone code really
* reload the timezone data. Respect any initial setting of
* TZ, in case the system is configured specially.
*/
dprintf("loading timezone data via tzset()\n");
if (getenv("TZ")) {
tzset();
} else {
setenv("TZ", ":/etc/localtime", 1);
tzset();
unsetenv("TZ");
}
/*
* Close all open log files.
*/
Initialized = 0;
STAILQ_FOREACH(f, &fhead, 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:
close_filed(f);
break;
case F_PIPE:
deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
close_filed(f);
break;
}
}
while(!STAILQ_EMPTY(&fhead)) {
f = STAILQ_FIRST(&fhead);
STAILQ_REMOVE_HEAD(&fhead, next);
free(f->f_program);
free(f->f_host);
free(f);
}
/* open the configuration file */
if ((cf = fopen(ConfFile, "r")) == NULL) {
dprintf("cannot open %s\n", ConfFile);
f = cfline("*.ERR\t/dev/console", "*", "*");
if (f != NULL)
addfile(f);
f = cfline("*.PANIC\t*", "*", "*");
if (f != NULL)
addfile(f);
Initialized = 1;
return;
}
readconfigfile(cf, 1);
/* close the configuration file */
(void)fclose(cf);
Initialized = 1;
if (Debug) {
int port;
STAILQ_FOREACH(f, &fhead, 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->fu_fname);
break;
case F_CONSOLE:
case F_TTY:
printf("%s%s", _PATH_DEV, f->fu_fname);
break;
case F_FORW:
switch (f->fu_forw_addr->ai_addr->sa_family) {
#ifdef INET
case AF_INET:
port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port);
break;
#endif
#ifdef INET6
case AF_INET6:
port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port);
break;
#endif
default:
port = 0;
}
if (port != 514) {
printf("%s:%d",
f->fu_forw_hname, port);
} else {
printf("%s", f->fu_forw_hname);
}
break;
case F_PIPE:
printf("%s", f->fu_pipe_pname);
break;
case F_USERS:
for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++)
printf("%s, ", f->fu_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");
/*
* Log a change in hostname, but only on a restart.
*/
if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
(void)snprintf(hostMsg, sizeof(hostMsg),
"syslogd: hostname changed, \"%s\" to \"%s\"",
oldLocalHostName, LocalHostName);
logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
dprintf("%s\n", hostMsg);
}
/*
* Log the kernel boot file if we aren't going to use it as
* the prefix, and if this is *not* a restart.
*/
if (signo == 0 && !use_bootfile) {
(void)snprintf(bootfileMsg, sizeof(bootfileMsg),
"syslogd: kernel boot file is %s", bootfile);
logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
dprintf("%s\n", bootfileMsg);
}
}
/*
* Crack a configuration file line
*/
static struct filed *
cfline(const char *line, const char *prog, const char *host)
{
struct filed *f;
struct addrinfo hints, *res;
int error, i, pri, syncfile;
const char *p, *q;
char *bp;
char buf[MAXLINE], ebuf[100];
dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
f = calloc(1, sizeof(*f));
if (f == NULL) {
logerror("malloc");
exit(1);
}
errno = 0; /* keep strerror() stuff out of logerror messages */
for (i = 0; i <= LOG_NFACILITIES; i++)
f->f_pmask[i] = INTERNAL_NOPRI;
/* save hostname if any */
if (host && *host == '*')
host = NULL;
if (host) {
int hl;
f->f_host = strdup(host);
if (f->f_host == NULL) {
logerror("strdup");
exit(1);
}
hl = strlen(f->f_host);
if (hl > 0 && f->f_host[hl-1] == '.')
f->f_host[--hl] = '\0';
trimdomain(f->f_host, hl);
}
/* save program name if any */
if (prog && *prog == '*')
prog = NULL;
if (prog) {
f->f_program = strdup(prog);
if (f->f_program == NULL) {
logerror("strdup");
exit(1);
}
}
/* scan through the list of selectors */
for (p = line; *p && *p != '\t' && *p != ' ';) {
int pri_done;
int pri_cmp;
int pri_invert;
/* 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;
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++;
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;
pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
} else {
/* Ignore trailing spaces. */
for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
buf[i] = '\0';
pri = decode(buf, prioritynames);
if (pri < 0) {
errno = 0;
(void)snprintf(ebuf, sizeof ebuf,
"unknown priority name \"%s\"", buf);
logerror(ebuf);
free(f);
return (NULL);
}
}
if (!pri_cmp)
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;
(void)snprintf(ebuf, sizeof ebuf,
"unknown facility name \"%s\"",
buf);
logerror(ebuf);
free(f);
return (NULL);
}
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++;
if (*p == '-') {
syncfile = 0;
p++;
} else
syncfile = 1;
switch (*p) {
case '@':
{
char *tp;
char endkey = ':';
/*
* scan forward to see if there is a port defined.
* so we can't use strlcpy..
*/
i = sizeof(f->fu_forw_hname);
tp = f->fu_forw_hname;
p++;
/*
* an ipv6 address should start with a '[' in that case
* we should scan for a ']'
*/
if (*p == '[') {
p++;
endkey = ']';
}
while (*p && (*p != endkey) && (i-- > 0)) {
*tp++ = *p++;
}
if (endkey == ']' && *p == endkey)
p++;
*tp = '\0';
}
/* See if we copied a domain and have a port */
if (*p == ':')
p++;
else
p = NULL;
hints = (struct addrinfo){
.ai_family = family,
.ai_socktype = SOCK_DGRAM
};
error = getaddrinfo(f->fu_forw_hname,
p ? p : "syslog", &hints, &res);
if (error) {
logerror(gai_strerror(error));
break;
}
f->fu_forw_addr = res;
f->f_type = F_FORW;
break;
case '/':
if ((f->f_file = open(p, logflags, 0600)) < 0) {
f->f_type = F_UNUSED;
logerror(p);
break;
}
if (syncfile)
f->f_flags |= FFLAG_SYNC;
if (isatty(f->f_file)) {
if (strcmp(p, ctty) == 0)
f->f_type = F_CONSOLE;
else
f->f_type = F_TTY;
(void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1,
sizeof(f->fu_fname));
} else {
(void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname));
f->f_type = F_FILE;
}
break;
case '|':
f->fu_pipe_pid = 0;
(void)strlcpy(f->fu_pipe_pname, p + 1,
sizeof(f->fu_pipe_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->fu_uname[i], p, MAXLOGNAME - 1);
if ((q - p) >= MAXLOGNAME)
f->fu_uname[i][MAXLOGNAME - 1] = '\0';
else
f->fu_uname[i][q - p] = '\0';
while (*q == ',' || *q == ' ')
q++;
p = q;
}
f->f_type = F_USERS;
break;
}
return (f);
}
/*
* Decode a symbolic name to a numeric value
*/
static int
decode(const char *name, const CODE *codetab)
{
const 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);
}
static void
markit(void)
{
struct filed *f;
struct deadq_entry *dq, *dq0;
now = time((time_t *)NULL);
MarkSeq += TIMERINTVL;
if (MarkSeq >= MarkInterval) {
logmsg(LOG_INFO, "-- MARK --",
LocalHostName, ADDDATE|MARK);
MarkSeq = 0;
}
STAILQ_FOREACH(f, &fhead, 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. */
TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) {
switch (dq->dq_timeout) {
case 0:
/* Already signalled once, try harder now. */
if (kill(dq->dq_pid, SIGKILL) != 0)
(void)deadq_remove(dq);
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(dq->dq_pid, SIGTERM) != 0)
(void)deadq_remove(dq);
else
dq->dq_timeout--;
break;
default:
dq->dq_timeout--;
}
}
MarkSet = 0;
(void)alarm(TIMERINTVL);
}
/*
* fork off and become a daemon, but wait for the child to come online
* before returning to the parent, or we get disk thrashing at boot etc.
* Set a timer so we don't hang forever if it wedges.
*/
static int
waitdaemon(int 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);
(void)chdir("/");
if ((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 > STDERR_FILENO)
(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.
*/
static void
timedout(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.
*/
static int
allowaddr(char *s)
{
#if defined(INET) || defined(INET6)
char *cp1, *cp2;
struct allowedpeer *ap;
struct servent *se;
int masklen = -1;
struct addrinfo hints, *res = NULL;
#ifdef INET
in_addr_t *addrp, *maskp;
#endif
#ifdef INET6
uint32_t *addr6p, *mask6p;
#endif
char ip[NI_MAXHOST];
ap = calloc(1, sizeof(*ap));
if (ap == NULL)
err(1, "malloc failed");
#ifdef INET6
if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
#endif
cp1 = s;
if ((cp1 = strrchr(cp1, ':'))) {
/* service/port provided */
*cp1++ = '\0';
if (strlen(cp1) == 1 && *cp1 == '*')
/* any port allowed */
ap->port = 0;
else if ((se = getservbyname(cp1, "udp"))) {
ap->port = ntohs(se->s_port);
} else {
ap->port = strtol(cp1, &cp2, 0);
/* port not numeric */
if (*cp2 != '\0')
goto err;
}
} else {
if ((se = getservbyname("syslog", "udp")))
ap->port = ntohs(se->s_port);
else
/* sanity, should not happen */
ap->port = 514;
}
if ((cp1 = strchr(s, '/')) != NULL &&
strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
*cp1 = '\0';
if ((masklen = atoi(cp1 + 1)) < 0)
goto err;
}
#ifdef INET6
if (*s == '[') {
cp2 = s + strlen(s) - 1;
if (*cp2 == ']') {
++s;
*cp2 = '\0';
} else {
cp2 = NULL;
}
} else {
cp2 = NULL;
}
#endif
hints = (struct addrinfo){
.ai_family = PF_UNSPEC,
.ai_socktype = SOCK_DGRAM,
.ai_flags = AI_PASSIVE | AI_NUMERICHOST
};
if (getaddrinfo(s, NULL, &hints, &res) == 0) {
ap->isnumeric = 1;
memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen);
ap->a_mask = (struct sockaddr_storage){
.ss_family = res->ai_family,
.ss_len = res->ai_addrlen
};
switch (res->ai_family) {
#ifdef INET
case AF_INET:
maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr;
addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr;
if (masklen < 0) {
/* use default netmask */
if (IN_CLASSA(ntohl(*addrp)))
*maskp = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(*addrp)))
*maskp = htonl(IN_CLASSB_NET);
else
*maskp = htonl(IN_CLASSC_NET);
} else if (masklen == 0) {
*maskp = 0;
} else if (masklen <= 32) {
/* convert masklen to netmask */
*maskp = htonl(~((1 << (32 - masklen)) - 1));
} else {
goto err;
}
/* Lose any host bits in the network number. */
*addrp &= *maskp;
break;
#endif
#ifdef INET6
case AF_INET6:
if (masklen > 128)
goto err;
if (masklen < 0)
masklen = 128;
mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0];
addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0];
/* convert masklen to netmask */
while (masklen > 0) {
if (masklen < 32) {
*mask6p =
htonl(~(0xffffffff >> masklen));
*addr6p &= *mask6p;
break;
} else {
*mask6p++ = 0xffffffff;
addr6p++;
masklen -= 32;
}
}
break;
#endif
default:
goto err;
}
freeaddrinfo(res);
} else {
/* arg `s' is domain name */
ap->isnumeric = 0;
ap->a_name = s;
if (cp1)
*cp1 = '/';
#ifdef INET6
if (cp2) {
*cp2 = ']';
--s;
}
#endif
}
STAILQ_INSERT_TAIL(&aphead, ap, next);
if (Debug) {
printf("allowaddr: rule ");
if (ap->isnumeric) {
printf("numeric, ");
getnameinfo(sstosa(&ap->a_addr),
(sstosa(&ap->a_addr))->sa_len,
ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
printf("addr = %s, ", ip);
getnameinfo(sstosa(&ap->a_mask),
(sstosa(&ap->a_mask))->sa_len,
ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
printf("mask = %s; ", ip);
} else {
printf("domainname = %s; ", ap->a_name);
}
printf("port = %d\n", ap->port);
}
#endif
return (0);
err:
if (res != NULL)
freeaddrinfo(res);
free(ap);
return (-1);
}
/*
* Validate that the remote peer has permission to log to us.
*/
static int
validate(struct sockaddr *sa, const char *hname)
{
int i;
char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
struct allowedpeer *ap;
#ifdef INET
struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
#endif
#ifdef INET6
struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
#endif
struct addrinfo hints, *res;
u_short sport;
int num = 0;
STAILQ_FOREACH(ap, &aphead, next) {
num++;
}
dprintf("# of validation rule: %d\n", num);
if (num == 0)
/* traditional behaviour, allow everything */
return (1);
(void)strlcpy(name, hname, sizeof(name));
hints = (struct addrinfo){
.ai_family = PF_UNSPEC,
.ai_socktype = SOCK_DGRAM,
.ai_flags = AI_PASSIVE | AI_NUMERICHOST
};
if (getaddrinfo(name, NULL, &hints, &res) == 0)
freeaddrinfo(res);
else if (strchr(name, '.') == NULL) {
strlcat(name, ".", sizeof name);
strlcat(name, LocalDomain, sizeof name);
}
if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port),
NI_NUMERICHOST | NI_NUMERICSERV) != 0)
return (0); /* for safety, should not occur */
dprintf("validate: dgram from IP %s, port %s, name %s;\n",
ip, port, name);
sport = atoi(port);
/* now, walk down the list */
i = 0;
STAILQ_FOREACH(ap, &aphead, next) {
i++;
if (ap->port != 0 && ap->port != sport) {
dprintf("rejected in rule %d due to port mismatch.\n",
i);
continue;
}
if (ap->isnumeric) {
if (ap->a_addr.ss_family != sa->sa_family) {
dprintf("rejected in rule %d due to address family mismatch.\n", i);
continue;
}
#ifdef INET
else if (ap->a_addr.ss_family == AF_INET) {
sin4 = satosin(sa);
a4p = satosin(&ap->a_addr);
m4p = satosin(&ap->a_mask);
if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
!= a4p->sin_addr.s_addr) {
dprintf("rejected in rule %d due to IP mismatch.\n", i);
continue;
}
}
#endif
#ifdef INET6
else if (ap->a_addr.ss_family == AF_INET6) {
sin6 = satosin6(sa);
a6p = satosin6(&ap->a_addr);
m6p = satosin6(&ap->a_mask);
if (a6p->sin6_scope_id != 0 &&
sin6->sin6_scope_id != a6p->sin6_scope_id) {
dprintf("rejected in rule %d due to scope mismatch.\n", i);
continue;
}
if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr,
&a6p->sin6_addr, &m6p->sin6_addr) != 0) {
dprintf("rejected in rule %d due to IP mismatch.\n", i);
continue;
}
}
#endif
else
continue;
} else {
if (fnmatch(ap->a_name, name, FNM_NOESCAPE) ==
FNM_NOMATCH) {
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 *.
*/
static int
p_open(const char *prog, pid_t *rpid)
{
int pfd[2], nulldesc;
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:
close(nulldesc);
return (-1);
case 0:
(void)setsid(); /* Avoid catching SIGHUPs. */
argv[0] = strdup("sh");
argv[1] = strdup("-c");
argv[2] = strdup(prog);
argv[3] = NULL;
if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
logerror("strdup");
exit(1);
}
alarm(0);
/* Restore signals marked as SIG_IGN. */
(void)signal(SIGINT, SIG_DFL);
(void)signal(SIGQUIT, SIG_DFL);
(void)signal(SIGPIPE, SIG_DFL);
dup2(pfd[0], STDIN_FILENO);
dup2(nulldesc, STDOUT_FILENO);
dup2(nulldesc, STDERR_FILENO);
closefrom(STDERR_FILENO + 1);
(void)execvp(_PATH_BSHELL, argv);
_exit(255);
}
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);
}
*rpid = pid;
return (pfd[1]);
}
static void
deadq_enter(pid_t pid, const char *name)
{
struct deadq_entry *dq;
int status;
if (pid == 0)
return;
/*
* 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;
}
dq = malloc(sizeof(*dq));
if (dq == NULL) {
logerror("malloc");
exit(1);
}
*dq = (struct deadq_entry){
.dq_pid = pid,
.dq_timeout = DQ_TIMO_INIT
};
TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries);
}
static int
deadq_remove(struct deadq_entry *dq)
{
if (dq != NULL) {
TAILQ_REMOVE(&deadq_head, dq, dq_entries);
free(dq);
return (1);
}
return (0);
}
static int
deadq_removebypid(pid_t pid)
{
struct deadq_entry *dq;
TAILQ_FOREACH(dq, &deadq_head, dq_entries) {
if (dq->dq_pid == pid)
break;
}
return (deadq_remove(dq));
}
static void
log_deadchild(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);
}
static int
socksetup(struct peer *pe)
{
struct addrinfo hints, *res, *res0;
int error;
char *cp;
int (*sl_recv)(struct socklist *);
/*
* We have to handle this case for backwards compatibility:
* If there are two (or more) colons but no '[' and ']',
* assume this is an inet6 address without a service.
*/
if (pe->pe_name != NULL) {
#ifdef INET6
if (pe->pe_name[0] == '[' &&
(cp = strchr(pe->pe_name + 1, ']')) != NULL) {
pe->pe_name = &pe->pe_name[1];
*cp = '\0';
if (cp[1] == ':' && cp[2] != '\0')
pe->pe_serv = cp + 2;
} else {
#endif
cp = strchr(pe->pe_name, ':');
if (cp != NULL && strchr(cp + 1, ':') == NULL) {
*cp = '\0';
if (cp[1] != '\0')
pe->pe_serv = cp + 1;
if (cp == pe->pe_name)
pe->pe_name = NULL;
}
#ifdef INET6
}
#endif
}
hints = (struct addrinfo){
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_DGRAM,
.ai_flags = AI_PASSIVE
};
if (pe->pe_name != NULL)
dprintf("Trying peer: %s\n", pe->pe_name);
if (pe->pe_serv == NULL)
pe->pe_serv = "syslog";
error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0);
if (error) {
char *msgbuf;
asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s",
pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv,
gai_strerror(error));
errno = 0;
if (msgbuf == NULL)
logerror(gai_strerror(error));
else
logerror(msgbuf);
free(msgbuf);
die(0);
}
for (res = res0; res != NULL; res = res->ai_next) {
int s;
if (res->ai_family != AF_LOCAL &&
SecureMode > 1) {
/* Only AF_LOCAL in secure mode. */
continue;
}
if (family != AF_UNSPEC &&
res->ai_family != AF_LOCAL && res->ai_family != family)
continue;
s = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (s < 0) {
logerror("socket");
error++;
continue;
}
#ifdef INET6
if (res->ai_family == AF_INET6) {
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
&(int){1}, sizeof(int)) < 0) {
logerror("setsockopt(IPV6_V6ONLY)");
close(s);
error++;
continue;
}
}
#endif
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
&(int){1}, sizeof(int)) < 0) {
logerror("setsockopt(SO_REUSEADDR)");
close(s);
error++;
continue;
}
/*
* Bind INET and UNIX-domain sockets.
*
* A UNIX-domain socket is always bound to a pathname
* regardless of -N flag.
*
* For INET sockets, RFC 3164 recommends that client
* side message should come from the privileged syslogd port.
*
* If the system administrator chooses not to obey
* this, we can skip the bind() step so that the
* system will choose a port for us.
*/
if (res->ai_family == AF_LOCAL)
unlink(pe->pe_name);
if (res->ai_family == AF_LOCAL ||
NoBind == 0 || pe->pe_name != NULL) {
if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
logerror("bind");
close(s);
error++;
continue;
}
if (res->ai_family == AF_LOCAL ||
SecureMode == 0)
increase_rcvbuf(s);
}
if (res->ai_family == AF_LOCAL &&
chmod(pe->pe_name, pe->pe_mode) < 0) {
dprintf("chmod %s: %s\n", pe->pe_name,
strerror(errno));
close(s);
error++;
continue;
}
dprintf("new socket fd is %d\n", s);
if (res->ai_socktype != SOCK_DGRAM) {
listen(s, 5);
}
sl_recv = socklist_recv_sock;
#if defined(INET) || defined(INET6)
if (SecureMode && (res->ai_family == AF_INET ||
res->ai_family == AF_INET6)) {
dprintf("shutdown\n");
/* Forbid communication in secure mode. */
if (shutdown(s, SHUT_RD) < 0 &&
errno != ENOTCONN) {
logerror("shutdown");
if (!Debug)
die(0);
}
sl_recv = NULL;
} else
#endif
dprintf("listening on socket\n");
dprintf("sending on socket\n");
addsock(res->ai_addr, res->ai_addrlen,
&(struct socklist){
.sl_socket = s,
.sl_peer = pe,
.sl_recv = sl_recv
});
}
freeaddrinfo(res0);
return(error);
}
static void
increase_rcvbuf(int fd)
{
socklen_t len;
if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len,
&(socklen_t){sizeof(len)}) == 0) {
if (len < RCVBUF_MINSIZE) {
len = RCVBUF_MINSIZE;
setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
}
}
}
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