File: [local] / src / usr.sbin / syslogd / syslogd.c (download)
Revision 1.280, Sat Jan 6 19:34:54 2024 UTC (5 months ago) by bluhm
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, HEAD
Changes since 1.279: +11 -4 lines
Prevent use after free of TLS context at syslogd(8) shutdown.
When splitting the event fields f_ev and f_bufev, disabling some
events was missed. Callbacks could happen after tls_free(). Call
bufferevent_disable() before f_bufev and struct filed are cleaned.
In some error cases f_bufev might be NULL, add a check before
cleanup.
OK tb@
|
/* $OpenBSD: syslogd.c,v 1.280 2024/01/06 19:34:54 bluhm Exp $ */
/*
* Copyright (c) 2014-2021 Alexander Bluhm <bluhm@genua.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* 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.
*/
/*
* 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)
* memory buffer logging by Damien Miller
* IPv6, libevent, syslog over TCP and TLS by Alexander Bluhm
*/
#define MAX_UDPMSG 1180 /* maximum UDP send size */
#define MIN_MEMBUF (LOG_MAXLINE * 4) /* Minimum memory buffer size */
#define MAX_MEMBUF (256 * 1024) /* Maximum memory buffer size */
#define MAX_MEMBUF_NAME 64 /* Max length of membuf log name */
#define MAX_TCPBUF (256 * 1024) /* Maximum tcp event buffer size */
#define MAXSVLINE 120 /* maximum saved line length */
#define FD_RESERVE 5 /* file descriptors not accepted */
#define DEFUPRI (LOG_USER|LOG_NOTICE)
#define DEFSPRI (LOG_KERN|LOG_CRIT)
#define TIMERINTVL 30 /* interval for checking flush, mark */
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/msgbuf.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/un.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <limits.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tls.h>
#include <unistd.h>
#include <utmp.h>
#include <vis.h>
#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
#define SYSLOG_NAMES
#include <sys/syslog.h>
#include "log.h"
#include "syslogd.h"
#include "evbuffer_tls.h"
#include "parsemsg.h"
char *ConfFile = _PATH_LOGCONF;
const char ctty[] = _PATH_CONSOLE;
#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 MARK 0x008 /* this message is a mark */
/*
* This structure represents the files that will have log
* copies printed.
*/
struct filed {
SIMPLEQ_ENTRY(filed) f_next; /* next in linked list */
int f_type; /* entry type, see below */
int f_file; /* file descriptor */
time_t f_time; /* time this was last written */
u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */
char *f_program; /* program this applies to */
char *f_hostname; /* host this applies to */
union {
char f_uname[MAXUNAMES][UT_NAMESIZE+1];
struct {
char f_loghost[1+4+3+1+NI_MAXHOST+1+NI_MAXSERV];
/* @proto46://[hostname]:servname\0 */
struct sockaddr_storage f_addr;
struct buffertls f_buftls;
struct bufferevent *f_bufev;
struct event f_ev;
struct tls *f_ctx;
char *f_ipproto;
char *f_host;
char *f_port;
int f_retrywait;
} f_forw; /* forwarding address */
char f_fname[PATH_MAX];
struct {
char f_mname[MAX_MEMBUF_NAME];
struct ringbuf *f_rb;
int f_overflow;
int f_attached;
size_t f_len;
} f_mb; /* Memory buffer */
} f_un;
char f_prevline[MAXSVLINE]; /* last message logged */
char f_lasttime[33]; /* time of last occurrence */
char f_prevhost[HOST_NAME_MAX+1]; /* host from which recd. */
int f_prevpri; /* pri of f_prevline */
int f_prevlen; /* length of f_prevline */
int f_prevcount; /* repetition cnt of prevline */
unsigned int f_repeatcount; /* number of "repeated" msgs */
int f_quick; /* abort when matched */
int f_dropped; /* warn, dropped message */
time_t f_lasterrtime; /* last error was reported */
};
/*
* 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_FORWUDP 4 /* remote machine via UDP */
#define F_USERS 5 /* list of users */
#define F_WALL 6 /* everyone logged on */
#define F_MEMBUF 7 /* memory buffer */
#define F_PIPE 8 /* pipe to external program */
#define F_FORWTCP 9 /* remote machine via TCP */
#define F_FORWTLS 10 /* remote machine via TLS */
char *TypeNames[] = {
"UNUSED", "FILE", "TTY", "CONSOLE",
"FORWUDP", "USERS", "WALL", "MEMBUF",
"PIPE", "FORWTCP", "FORWTLS",
};
SIMPLEQ_HEAD(filed_list, filed) Files;
struct filed consfile;
int Debug; /* debug flag */
int Foreground; /* run in foreground, instead of daemonizing */
char LocalHostName[HOST_NAME_MAX+1]; /* our hostname */
int Started = 0; /* set after privsep */
int Initialized = 0; /* set when we have initialized ourselves */
int MarkInterval = 20 * 60; /* interval between marks in seconds */
int MarkSeq = 0; /* mark sequence number */
int PrivChild = 0; /* Exec the privileged parent process */
int Repeat = 0; /* 0 msg repeated, 1 in files only, 2 never */
int SecureMode = 1; /* when true, speak only unix domain socks */
int NoDNS = 0; /* when true, refrain from doing DNS lookups */
int ZuluTime = 0; /* display date and time in UTC ISO format */
int IncludeHostname = 0; /* include RFC 3164 hostnames when forwarding */
int Family = PF_UNSPEC; /* protocol family, may disable IPv4 or IPv6 */
struct tls *server_ctx;
struct tls_config *client_config, *server_config;
const char *CAfile = "/etc/ssl/cert.pem"; /* file containing CA certificates */
int NoVerify = 0; /* do not verify TLS server x509 certificate */
const char *ClientCertfile = NULL;
const char *ClientKeyfile = NULL;
const char *ServerCAfile = NULL;
int udpsend_dropped = 0; /* messages dropped due to UDP not ready */
int tcpbuf_dropped = 0; /* count messages dropped from TCP or TLS */
int file_dropped = 0; /* messages dropped due to file system full */
int init_dropped = 0; /* messages dropped during initialization */
#define CTL_READING_CMD 1
#define CTL_WRITING_REPLY 2
#define CTL_WRITING_CONT_REPLY 3
int ctl_state = 0; /* What the control socket is up to */
int membuf_drop = 0; /* logs dropped in continuous membuf read */
/*
* Client protocol NB. all numeric fields in network byte order
*/
#define CTL_VERSION 2
/* Request */
struct {
u_int32_t version;
#define CMD_READ 1 /* Read out log */
#define CMD_READ_CLEAR 2 /* Read and clear log */
#define CMD_CLEAR 3 /* Clear log */
#define CMD_LIST 4 /* List available logs */
#define CMD_FLAGS 5 /* Query flags only */
#define CMD_READ_CONT 6 /* Read out log continuously */
u_int32_t cmd;
u_int32_t lines;
char logname[MAX_MEMBUF_NAME];
} ctl_cmd;
size_t ctl_cmd_bytes = 0; /* number of bytes of ctl_cmd read */
/* Reply */
struct ctl_reply_hdr {
u_int32_t version;
#define CTL_HDR_FLAG_OVERFLOW 0x01
u_int32_t flags;
/* Reply text follows, up to MAX_MEMBUF long */
};
#define CTL_HDR_LEN (sizeof(struct ctl_reply_hdr))
#define CTL_REPLY_MAXSIZE (CTL_HDR_LEN + MAX_MEMBUF)
#define CTL_REPLY_SIZE (strlen(reply_text) + CTL_HDR_LEN)
char *ctl_reply = NULL; /* Buffer for control connection reply */
char *reply_text; /* Start of reply text in buffer */
size_t ctl_reply_size = 0; /* Number of bytes used in reply */
size_t ctl_reply_offset = 0; /* Number of bytes of reply written so far */
char *linebuf;
int linesize;
int fd_ctlconn, fd_udp, fd_udp6, send_udp, send_udp6;
struct event *ev_ctlaccept, *ev_ctlread, *ev_ctlwrite;
struct peer {
struct buffertls p_buftls;
struct bufferevent *p_bufev;
struct tls *p_ctx;
char *p_peername;
char *p_hostname;
int p_fd;
};
char hostname_unknown[] = "???";
void klog_readcb(int, short, void *);
void udp_readcb(int, short, void *);
void unix_readcb(int, short, void *);
int reserve_accept4(int, int, struct event *,
void (*)(int, short, void *), struct sockaddr *, socklen_t *, int);
void tcp_acceptcb(int, short, void *);
void tls_acceptcb(int, short, void *);
void acceptcb(int, short, void *, int);
int octet_counting(struct evbuffer *, char **, int);
int non_transparent_framing(struct evbuffer *, char **);
void tcp_readcb(struct bufferevent *, void *);
void tcp_closecb(struct bufferevent *, short, void *);
int tcp_socket(struct filed *);
void tcp_dropcb(struct bufferevent *, void *);
void tcp_writecb(struct bufferevent *, void *);
void tcp_errorcb(struct bufferevent *, short, void *);
void tcp_connectcb(int, short, void *);
int loghost_resolve(struct filed *);
void loghost_retry(struct filed *);
void udp_resolvecb(int, short, void *);
int tcpbuf_countmsg(struct bufferevent *bufev);
void die_signalcb(int, short, void *);
void mark_timercb(int, short, void *);
void init_signalcb(int, short, void *);
void ctlsock_acceptcb(int, short, void *);
void ctlconn_readcb(int, short, void *);
void ctlconn_writecb(int, short, void *);
void ctlconn_logto(char *);
void ctlconn_cleanup(void);
struct filed *cfline(char *, char *, char *);
void cvthname(struct sockaddr *, char *, size_t);
int decode(const char *, const CODE *);
void markit(void);
void fprintlog(struct filed *, int, char *);
void dropped_warn(int *, const char *);
void init(void);
void logevent(int, const char *);
void logmsg(struct msg *, int, char *);
struct filed *find_dup(struct filed *);
void printline(char *, char *);
void printsys(char *);
void current_time(char *);
void usage(void);
void wallmsg(struct filed *, struct iovec *);
int loghost_parse(char *, char **, char **, char **);
int getmsgbufsize(void);
void address_alloc(const char *, const char *, char ***, char ***, int *);
int socket_bind(const char *, const char *, const char *, int,
int *, int *);
int unix_socket(char *, int, mode_t);
void double_sockbuf(int, int, int);
void set_sockbuf(int);
void set_keepalive(int);
void tailify_replytext(char *, int);
int
main(int argc, char *argv[])
{
struct timeval to;
struct event *ev_klog, *ev_sendsys, *ev_udp, *ev_udp6,
*ev_bind, *ev_listen, *ev_tls, *ev_unix,
*ev_hup, *ev_int, *ev_quit, *ev_term, *ev_mark;
sigset_t sigmask;
const char *errstr;
char *p;
int ch, i;
int lockpipe[2] = { -1, -1}, pair[2], nullfd, fd;
int fd_ctlsock, fd_klog, fd_sendsys, *fd_bind, *fd_listen;
int *fd_tls, *fd_unix, nunix, nbind, nlisten, ntls;
char **path_unix, *path_ctlsock;
char **bind_host, **bind_port, **listen_host, **listen_port;
char *tls_hostport, **tls_host, **tls_port;
/* block signal until handler is set up */
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGHUP);
if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1)
err(1, "sigprocmask block");
if ((path_unix = malloc(sizeof(*path_unix))) == NULL)
err(1, "malloc %s", _PATH_LOG);
path_unix[0] = _PATH_LOG;
nunix = 1;
path_ctlsock = NULL;
bind_host = listen_host = tls_host = NULL;
bind_port = listen_port = tls_port = NULL;
tls_hostport = NULL;
nbind = nlisten = ntls = 0;
while ((ch = getopt(argc, argv,
"46a:C:c:dFf:hK:k:m:nP:p:rS:s:T:U:uVZ")) != -1) {
switch (ch) {
case '4': /* disable IPv6 */
Family = PF_INET;
break;
case '6': /* disable IPv4 */
Family = PF_INET6;
break;
case 'a':
if ((path_unix = reallocarray(path_unix, nunix + 1,
sizeof(*path_unix))) == NULL)
err(1, "unix path %s", optarg);
path_unix[nunix++] = optarg;
break;
case 'C': /* file containing CA certificates */
CAfile = optarg;
break;
case 'c': /* file containing client certificate */
ClientCertfile = optarg;
break;
case 'd': /* debug */
Debug++;
break;
case 'F': /* foreground */
Foreground = 1;
break;
case 'f': /* configuration file */
ConfFile = optarg;
break;
case 'h': /* RFC 3164 hostnames */
IncludeHostname = 1;
break;
case 'K': /* verify client with CA file */
ServerCAfile = optarg;
break;
case 'k': /* file containing client key */
ClientKeyfile = optarg;
break;
case 'm': /* mark interval */
MarkInterval = strtonum(optarg, 0, 365*24*60, &errstr);
if (errstr)
errx(1, "mark_interval %s: %s", errstr, optarg);
MarkInterval *= 60;
break;
case 'n': /* don't do DNS lookups */
NoDNS = 1;
break;
case 'P': /* used internally, exec the parent */
PrivChild = strtonum(optarg, 2, INT_MAX, &errstr);
if (errstr)
errx(1, "priv child %s: %s", errstr, optarg);
break;
case 'p': /* path */
path_unix[0] = optarg;
break;
case 'r':
Repeat++;
break;
case 'S': /* allow tls and listen on address */
if (tls_hostport == NULL)
tls_hostport = optarg;
address_alloc("tls", optarg, &tls_host, &tls_port,
&ntls);
break;
case 's':
path_ctlsock = optarg;
break;
case 'T': /* allow tcp and listen on address */
address_alloc("listen", optarg, &listen_host,
&listen_port, &nlisten);
break;
case 'U': /* allow udp only from address */
address_alloc("bind", optarg, &bind_host, &bind_port,
&nbind);
break;
case 'u': /* allow udp input port */
SecureMode = 0;
break;
case 'V': /* do not verify certificates */
NoVerify = 1;
break;
case 'Z': /* time stamps in UTC ISO format */
ZuluTime = 1;
break;
default:
usage();
}
}
if (argc != optind)
usage();
log_init(Debug, LOG_SYSLOG);
log_procinit("syslogd");
if (Debug)
setvbuf(stdout, NULL, _IOLBF, 0);
if ((nullfd = open(_PATH_DEVNULL, O_RDWR)) == -1)
fatal("open %s", _PATH_DEVNULL);
for (fd = nullfd + 1; fd <= STDERR_FILENO; fd++) {
if (fcntl(fd, F_GETFL) == -1 && errno == EBADF)
if (dup2(nullfd, fd) == -1)
fatal("dup2 null");
}
if (PrivChild > 1)
priv_exec(ConfFile, NoDNS, PrivChild, argc, argv);
consfile.f_type = F_CONSOLE;
(void)strlcpy(consfile.f_un.f_fname, ctty,
sizeof(consfile.f_un.f_fname));
consfile.f_file = open(consfile.f_un.f_fname, O_WRONLY|O_NONBLOCK);
if (consfile.f_file == -1)
log_warn("open %s", consfile.f_un.f_fname);
if (gethostname(LocalHostName, sizeof(LocalHostName)) == -1 ||
LocalHostName[0] == '\0')
strlcpy(LocalHostName, "-", sizeof(LocalHostName));
else if ((p = strchr(LocalHostName, '.')) != NULL)
*p = '\0';
/* Reserve space for kernel message buffer plus buffer full message. */
linesize = getmsgbufsize() + 64;
if (linesize < LOG_MAXLINE)
linesize = LOG_MAXLINE;
linesize++;
if ((linebuf = malloc(linesize)) == NULL)
fatal("allocate line buffer");
if (socket_bind("udp", NULL, "syslog", SecureMode,
&fd_udp, &fd_udp6) == -1)
log_warnx("socket bind * failed");
if ((fd_bind = reallocarray(NULL, nbind, sizeof(*fd_bind))) == NULL)
fatal("allocate bind fd");
for (i = 0; i < nbind; i++) {
if (socket_bind("udp", bind_host[i], bind_port[i], 0,
&fd_bind[i], &fd_bind[i]) == -1)
log_warnx("socket bind udp failed");
}
if ((fd_listen = reallocarray(NULL, nlisten, sizeof(*fd_listen)))
== NULL)
fatal("allocate listen fd");
for (i = 0; i < nlisten; i++) {
if (socket_bind("tcp", listen_host[i], listen_port[i], 0,
&fd_listen[i], &fd_listen[i]) == -1)
log_warnx("socket listen tcp failed");
}
if ((fd_tls = reallocarray(NULL, ntls, sizeof(*fd_tls))) == NULL)
fatal("allocate tls fd");
for (i = 0; i < ntls; i++) {
if (socket_bind("tls", tls_host[i], tls_port[i], 0,
&fd_tls[i], &fd_tls[i]) == -1)
log_warnx("socket listen tls failed");
}
if ((fd_unix = reallocarray(NULL, nunix, sizeof(*fd_unix))) == NULL)
fatal("allocate unix fd");
for (i = 0; i < nunix; i++) {
fd_unix[i] = unix_socket(path_unix[i], SOCK_DGRAM, 0666);
if (fd_unix[i] == -1) {
if (i == 0)
log_warnx("log socket %s failed", path_unix[i]);
continue;
}
double_sockbuf(fd_unix[i], SO_RCVBUF, 0);
}
if (socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pair) == -1) {
log_warn("socketpair sendsyslog");
fd_sendsys = -1;
} else {
/*
* Avoid to lose messages from sendsyslog(2). A larger
* 1 MB socket buffer compensates bursts.
*/
double_sockbuf(pair[0], SO_RCVBUF, 1<<20);
double_sockbuf(pair[1], SO_SNDBUF, 1<<20);
fd_sendsys = pair[0];
}
fd_ctlsock = fd_ctlconn = -1;
if (path_ctlsock != NULL) {
fd_ctlsock = unix_socket(path_ctlsock, SOCK_STREAM, 0600);
if (fd_ctlsock == -1) {
log_warnx("control socket %s failed", path_ctlsock);
} else {
if (listen(fd_ctlsock, 5) == -1) {
log_warn("listen control socket");
close(fd_ctlsock);
fd_ctlsock = -1;
}
}
}
if ((fd_klog = open(_PATH_KLOG, O_RDONLY)) == -1) {
log_warn("open %s", _PATH_KLOG);
} else if (fd_sendsys != -1) {
/* Use /dev/klog to register sendsyslog(2) receiver. */
if (ioctl(fd_klog, LIOCSFD, &pair[1]) == -1)
log_warn("ioctl klog LIOCSFD sendsyslog");
}
if (fd_sendsys != -1)
close(pair[1]);
if ((client_config = tls_config_new()) == NULL)
log_warn("tls_config_new client");
if (tls_hostport) {
if ((server_config = tls_config_new()) == NULL)
log_warn("tls_config_new server");
if ((server_ctx = tls_server()) == NULL) {
log_warn("tls_server");
for (i = 0; i < ntls; i++)
close(fd_tls[i]);
free(fd_tls);
fd_tls = NULL;
free(tls_host);
free(tls_port);
tls_host = tls_port = NULL;
ntls = 0;
}
}
if (client_config) {
if (NoVerify) {
tls_config_insecure_noverifycert(client_config);
tls_config_insecure_noverifyname(client_config);
} else {
if (tls_config_set_ca_file(client_config,
CAfile) == -1) {
log_warnx("load client TLS CA: %s",
tls_config_error(client_config));
/* avoid reading default certs in chroot */
tls_config_set_ca_mem(client_config, "", 0);
} else
log_debug("CAfile %s", CAfile);
}
if (ClientCertfile && ClientKeyfile) {
if (tls_config_set_cert_file(client_config,
ClientCertfile) == -1)
log_warnx("load client TLS cert: %s",
tls_config_error(client_config));
else
log_debug("ClientCertfile %s", ClientCertfile);
if (tls_config_set_key_file(client_config,
ClientKeyfile) == -1)
log_warnx("load client TLS key: %s",
tls_config_error(client_config));
else
log_debug("ClientKeyfile %s", ClientKeyfile);
} else if (ClientCertfile || ClientKeyfile) {
log_warnx("options -c and -k must be used together");
}
if (tls_config_set_protocols(client_config,
TLS_PROTOCOLS_ALL) != 0)
log_warnx("set client TLS protocols: %s",
tls_config_error(client_config));
if (tls_config_set_ciphers(client_config, "all") != 0)
log_warnx("set client TLS ciphers: %s",
tls_config_error(client_config));
}
if (server_config && server_ctx) {
const char *names[2];
names[0] = tls_hostport;
names[1] = tls_host[0];
for (i = 0; i < 2; i++) {
if (asprintf(&p, "/etc/ssl/private/%s.key", names[i])
== -1)
continue;
if (tls_config_set_key_file(server_config, p) == -1) {
log_warnx("load server TLS key: %s",
tls_config_error(server_config));
free(p);
continue;
}
log_debug("Keyfile %s", p);
free(p);
if (asprintf(&p, "/etc/ssl/%s.crt", names[i]) == -1)
continue;
if (tls_config_set_cert_file(server_config, p) == -1) {
log_warnx("load server TLS cert: %s",
tls_config_error(server_config));
free(p);
continue;
}
log_debug("Certfile %s", p);
free(p);
break;
}
if (ServerCAfile) {
if (tls_config_set_ca_file(server_config,
ServerCAfile) == -1) {
log_warnx("load server TLS CA: %s",
tls_config_error(server_config));
/* avoid reading default certs in chroot */
tls_config_set_ca_mem(server_config, "", 0);
} else
log_debug("Server CAfile %s", ServerCAfile);
tls_config_verify_client(server_config);
}
if (tls_config_set_protocols(server_config,
TLS_PROTOCOLS_ALL) != 0)
log_warnx("set server TLS protocols: %s",
tls_config_error(server_config));
if (tls_config_set_ciphers(server_config, "compat") != 0)
log_warnx("Set server TLS ciphers: %s",
tls_config_error(server_config));
if (tls_configure(server_ctx, server_config) != 0) {
log_warnx("tls_configure server: %s",
tls_error(server_ctx));
tls_free(server_ctx);
server_ctx = NULL;
for (i = 0; i < ntls; i++)
close(fd_tls[i]);
free(fd_tls);
fd_tls = NULL;
free(tls_host);
free(tls_port);
tls_host = tls_port = NULL;
ntls = 0;
}
}
log_debug("off & running....");
if (!Debug && !Foreground) {
char c;
pipe(lockpipe);
switch(fork()) {
case -1:
err(1, "fork");
case 0:
setsid();
close(lockpipe[0]);
break;
default:
close(lockpipe[1]);
read(lockpipe[0], &c, 1);
_exit(0);
}
}
/* tuck my process id away */
if (!Debug) {
FILE *fp;
fp = fopen(_PATH_LOGPID, "w");
if (fp != NULL) {
fprintf(fp, "%ld\n", (long)getpid());
(void) fclose(fp);
}
}
/* Privilege separation begins here */
priv_init(lockpipe[1], nullfd, argc, argv);
if (pledge("stdio unix inet recvfd", NULL) == -1)
err(1, "pledge");
Started = 1;
/* Process is now unprivileged and inside a chroot */
if (Debug)
event_set_log_callback(logevent);
event_init();
if ((ev_ctlaccept = malloc(sizeof(struct event))) == NULL ||
(ev_ctlread = malloc(sizeof(struct event))) == NULL ||
(ev_ctlwrite = malloc(sizeof(struct event))) == NULL ||
(ev_klog = malloc(sizeof(struct event))) == NULL ||
(ev_sendsys = malloc(sizeof(struct event))) == NULL ||
(ev_udp = malloc(sizeof(struct event))) == NULL ||
(ev_udp6 = malloc(sizeof(struct event))) == NULL ||
(ev_bind = reallocarray(NULL, nbind, sizeof(struct event)))
== NULL ||
(ev_listen = reallocarray(NULL, nlisten, sizeof(struct event)))
== NULL ||
(ev_tls = reallocarray(NULL, ntls, sizeof(struct event)))
== NULL ||
(ev_unix = reallocarray(NULL, nunix, sizeof(struct event)))
== NULL ||
(ev_hup = malloc(sizeof(struct event))) == NULL ||
(ev_int = malloc(sizeof(struct event))) == NULL ||
(ev_quit = malloc(sizeof(struct event))) == NULL ||
(ev_term = malloc(sizeof(struct event))) == NULL ||
(ev_mark = malloc(sizeof(struct event))) == NULL)
err(1, "malloc");
event_set(ev_ctlaccept, fd_ctlsock, EV_READ|EV_PERSIST,
ctlsock_acceptcb, ev_ctlaccept);
event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST,
ctlconn_readcb, ev_ctlread);
event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST,
ctlconn_writecb, ev_ctlwrite);
event_set(ev_klog, fd_klog, EV_READ|EV_PERSIST, klog_readcb, ev_klog);
event_set(ev_sendsys, fd_sendsys, EV_READ|EV_PERSIST, unix_readcb,
ev_sendsys);
event_set(ev_udp, fd_udp, EV_READ|EV_PERSIST, udp_readcb, ev_udp);
event_set(ev_udp6, fd_udp6, EV_READ|EV_PERSIST, udp_readcb, ev_udp6);
for (i = 0; i < nbind; i++)
event_set(&ev_bind[i], fd_bind[i], EV_READ|EV_PERSIST,
udp_readcb, &ev_bind[i]);
for (i = 0; i < nlisten; i++)
event_set(&ev_listen[i], fd_listen[i], EV_READ|EV_PERSIST,
tcp_acceptcb, &ev_listen[i]);
for (i = 0; i < ntls; i++)
event_set(&ev_tls[i], fd_tls[i], EV_READ|EV_PERSIST,
tls_acceptcb, &ev_tls[i]);
for (i = 0; i < nunix; i++)
event_set(&ev_unix[i], fd_unix[i], EV_READ|EV_PERSIST,
unix_readcb, &ev_unix[i]);
signal_set(ev_hup, SIGHUP, init_signalcb, ev_hup);
signal_set(ev_int, SIGINT, die_signalcb, ev_int);
signal_set(ev_quit, SIGQUIT, die_signalcb, ev_quit);
signal_set(ev_term, SIGTERM, die_signalcb, ev_term);
evtimer_set(ev_mark, mark_timercb, ev_mark);
init();
/* Allocate ctl socket reply buffer if we have a ctl socket */
if (fd_ctlsock != -1 &&
(ctl_reply = malloc(CTL_REPLY_MAXSIZE)) == NULL)
fatal("allocate control socket reply buffer");
reply_text = ctl_reply + CTL_HDR_LEN;
if (!Debug) {
close(lockpipe[1]);
dup2(nullfd, STDIN_FILENO);
dup2(nullfd, STDOUT_FILENO);
dup2(nullfd, STDERR_FILENO);
}
if (nullfd > 2)
close(nullfd);
/*
* Signal to the priv process that the initial config parsing is done
* so that it will reject any future attempts to open more files
*/
priv_config_parse_done();
if (fd_ctlsock != -1)
event_add(ev_ctlaccept, NULL);
if (fd_klog != -1)
event_add(ev_klog, NULL);
if (fd_sendsys != -1)
event_add(ev_sendsys, NULL);
if (!SecureMode) {
if (fd_udp != -1)
event_add(ev_udp, NULL);
if (fd_udp6 != -1)
event_add(ev_udp6, NULL);
}
for (i = 0; i < nbind; i++)
if (fd_bind[i] != -1)
event_add(&ev_bind[i], NULL);
for (i = 0; i < nlisten; i++)
if (fd_listen[i] != -1)
event_add(&ev_listen[i], NULL);
for (i = 0; i < ntls; i++)
if (fd_tls[i] != -1)
event_add(&ev_tls[i], NULL);
for (i = 0; i < nunix; i++)
if (fd_unix[i] != -1)
event_add(&ev_unix[i], NULL);
signal_add(ev_hup, NULL);
signal_add(ev_term, NULL);
if (Debug || Foreground) {
signal_add(ev_int, NULL);
signal_add(ev_quit, NULL);
} else {
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
}
(void)signal(SIGCHLD, SIG_IGN);
(void)signal(SIGPIPE, SIG_IGN);
to.tv_sec = TIMERINTVL;
to.tv_usec = 0;
evtimer_add(ev_mark, &to);
log_info(LOG_INFO, "start");
log_debug("syslogd: started");
sigemptyset(&sigmask);
if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1)
err(1, "sigprocmask unblock");
/* Send message via libc, flushes log stash in kernel. */
openlog("syslogd", LOG_PID, LOG_SYSLOG);
syslog(LOG_DEBUG, "running");
event_dispatch();
/* NOTREACHED */
return (0);
}
void
address_alloc(const char *name, const char *address, char ***host,
char ***port, int *num)
{
char *p;
/* do not care about memory leak, argv has to be preserved */
if ((p = strdup(address)) == NULL)
err(1, "%s address %s", name, address);
if ((*host = reallocarray(*host, *num + 1, sizeof(**host))) == NULL)
err(1, "%s host %s", name, address);
if ((*port = reallocarray(*port, *num + 1, sizeof(**port))) == NULL)
err(1, "%s port %s", name, address);
if (loghost_parse(p, NULL, *host + *num, *port + *num) == -1)
errx(1, "bad %s address: %s", name, address);
(*num)++;
}
int
socket_bind(const char *proto, const char *host, const char *port,
int shutread, int *fd, int *fd6)
{
struct addrinfo hints, *res, *res0;
char hostname[NI_MAXHOST], servname[NI_MAXSERV];
int *fdp, error, reuseaddr;
*fd = *fd6 = -1;
if (proto == NULL)
proto = "udp";
if (port == NULL)
port = strcmp(proto, "tls") == 0 ? "syslog-tls" : "syslog";
memset(&hints, 0, sizeof(hints));
hints.ai_family = Family;
if (strcmp(proto, "udp") == 0) {
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
} else {
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
}
hints.ai_flags = AI_PASSIVE;
if ((error = getaddrinfo(host, port, &hints, &res0))) {
log_warnx("getaddrinfo proto %s, host %s, port %s: %s",
proto, host ? host : "*", port, gai_strerror(error));
return (-1);
}
for (res = res0; res; res = res->ai_next) {
switch (res->ai_family) {
case AF_INET:
fdp = fd;
break;
case AF_INET6:
fdp = fd6;
break;
default:
continue;
}
if (*fdp >= 0)
continue;
if ((*fdp = socket(res->ai_family,
res->ai_socktype | SOCK_NONBLOCK, res->ai_protocol)) == -1)
continue;
error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname,
sizeof(hostname), servname, sizeof(servname),
NI_NUMERICHOST | NI_NUMERICSERV |
(res->ai_socktype == SOCK_DGRAM ? NI_DGRAM : 0));
if (error) {
log_warnx("malformed bind address host \"%s\": %s",
host, gai_strerror(error));
strlcpy(hostname, hostname_unknown, sizeof(hostname));
strlcpy(servname, hostname_unknown, sizeof(servname));
}
if (shutread && shutdown(*fdp, SHUT_RD) == -1) {
log_warn("shutdown SHUT_RD "
"protocol %d, address %s, portnum %s",
res->ai_protocol, hostname, servname);
close(*fdp);
*fdp = -1;
continue;
}
if (!shutread && res->ai_protocol == IPPROTO_UDP)
double_sockbuf(*fdp, SO_RCVBUF, 0);
else if (res->ai_protocol == IPPROTO_TCP) {
set_sockbuf(*fdp);
set_keepalive(*fdp);
}
reuseaddr = 1;
if (setsockopt(*fdp, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
sizeof(reuseaddr)) == -1) {
log_warn("setsockopt SO_REUSEADDR "
"protocol %d, address %s, portnum %s",
res->ai_protocol, hostname, servname);
close(*fdp);
*fdp = -1;
continue;
}
if (bind(*fdp, res->ai_addr, res->ai_addrlen) == -1) {
log_warn("bind protocol %d, address %s, portnum %s",
res->ai_protocol, hostname, servname);
close(*fdp);
*fdp = -1;
continue;
}
if (!shutread && res->ai_protocol == IPPROTO_TCP &&
listen(*fdp, 10) == -1) {
log_warn("listen protocol %d, address %s, portnum %s",
res->ai_protocol, hostname, servname);
close(*fdp);
*fdp = -1;
continue;
}
}
freeaddrinfo(res0);
if (*fd == -1 && *fd6 == -1)
return (-1);
return (0);
}
void
klog_readcb(int fd, short event, void *arg)
{
struct event *ev = arg;
ssize_t n;
n = read(fd, linebuf, linesize - 1);
if (n > 0) {
linebuf[n] = '\0';
printsys(linebuf);
} else if (n == -1 && errno != EINTR) {
log_warn("read klog");
event_del(ev);
}
}
void
udp_readcb(int fd, short event, void *arg)
{
struct sockaddr_storage sa;
socklen_t salen;
ssize_t n;
salen = sizeof(sa);
n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa,
&salen);
if (n > 0) {
char resolve[NI_MAXHOST];
linebuf[n] = '\0';
cvthname((struct sockaddr *)&sa, resolve, sizeof(resolve));
log_debug("cvthname res: %s", resolve);
printline(resolve, linebuf);
} else if (n == -1 && errno != EINTR && errno != EWOULDBLOCK)
log_warn("recvfrom udp");
}
void
unix_readcb(int fd, short event, void *arg)
{
struct sockaddr_un sa;
socklen_t salen;
ssize_t n;
salen = sizeof(sa);
n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa,
&salen);
if (n > 0) {
linebuf[n] = '\0';
printline(LocalHostName, linebuf);
} else if (n == -1 && errno != EINTR && errno != EWOULDBLOCK)
log_warn("recvfrom unix");
}
int
reserve_accept4(int lfd, int event, struct event *ev,
void (*cb)(int, short, void *),
struct sockaddr *sa, socklen_t *salen, int flags)
{
struct timeval to = { 1, 0 };
int afd;
if (event & EV_TIMEOUT) {
log_debug("Listen again");
/* Enable the listen event, there is no timeout anymore. */
event_set(ev, lfd, EV_READ|EV_PERSIST, cb, ev);
event_add(ev, NULL);
errno = EWOULDBLOCK;
return (-1);
}
if (getdtablecount() + FD_RESERVE >= getdtablesize()) {
afd = -1;
errno = EMFILE;
} else
afd = accept4(lfd, sa, salen, flags);
if (afd == -1 && (errno == ENFILE || errno == EMFILE)) {
log_info(LOG_WARNING, "accept deferred: %s", strerror(errno));
/*
* Disable the listen event and convert it to a timeout.
* Pass the listen file descriptor to the callback.
*/
event_del(ev);
event_set(ev, lfd, 0, cb, ev);
event_add(ev, &to);
return (-1);
}
return (afd);
}
void
tcp_acceptcb(int lfd, short event, void *arg)
{
acceptcb(lfd, event, arg, 0);
}
void
tls_acceptcb(int lfd, short event, void *arg)
{
acceptcb(lfd, event, arg, 1);
}
void
acceptcb(int lfd, short event, void *arg, int usetls)
{
struct event *ev = arg;
struct peer *p;
struct sockaddr_storage ss;
socklen_t sslen;
char hostname[NI_MAXHOST], servname[NI_MAXSERV];
char *peername;
int fd, error;
sslen = sizeof(ss);
if ((fd = reserve_accept4(lfd, event, ev, tcp_acceptcb,
(struct sockaddr *)&ss, &sslen, SOCK_NONBLOCK)) == -1) {
if (errno != ENFILE && errno != EMFILE &&
errno != EINTR && errno != EWOULDBLOCK &&
errno != ECONNABORTED)
log_warn("accept tcp socket");
return;
}
log_debug("Accepting tcp connection");
error = getnameinfo((struct sockaddr *)&ss, sslen, hostname,
sizeof(hostname), servname, sizeof(servname),
NI_NUMERICHOST | NI_NUMERICSERV);
if (error) {
log_warnx("malformed TCP accept address: %s",
gai_strerror(error));
peername = hostname_unknown;
} else if (asprintf(&peername, ss.ss_family == AF_INET6 ?
"[%s]:%s" : "%s:%s", hostname, servname) == -1) {
log_warn("allocate hostname \"%s\"", hostname);
peername = hostname_unknown;
}
log_debug("Peer address and port %s", peername);
if ((p = malloc(sizeof(*p))) == NULL) {
log_warn("allocate peername \"%s\"", peername);
close(fd);
return;
}
p->p_fd = fd;
if ((p->p_bufev = bufferevent_new(fd, tcp_readcb, NULL, tcp_closecb,
p)) == NULL) {
log_warn("bufferevent \"%s\"", peername);
free(p);
close(fd);
return;
}
p->p_ctx = NULL;
if (usetls) {
if (tls_accept_socket(server_ctx, &p->p_ctx, fd) == -1) {
log_warnx("tls_accept_socket \"%s\": %s",
peername, tls_error(server_ctx));
bufferevent_free(p->p_bufev);
free(p);
close(fd);
return;
}
buffertls_set(&p->p_buftls, p->p_bufev, p->p_ctx, fd);
buffertls_accept(&p->p_buftls, fd);
log_debug("tcp accept callback: tls context success");
}
if (!NoDNS && peername != hostname_unknown &&
priv_getnameinfo((struct sockaddr *)&ss, ss.ss_len, hostname,
sizeof(hostname)) != 0) {
log_debug("Host name for accept address (%s) unknown",
hostname);
}
if (peername == hostname_unknown ||
(p->p_hostname = strdup(hostname)) == NULL)
p->p_hostname = hostname_unknown;
log_debug("Peer hostname %s", hostname);
p->p_peername = peername;
bufferevent_enable(p->p_bufev, EV_READ);
log_info(LOG_DEBUG, "%s logger \"%s\" accepted",
p->p_ctx ? "tls" : "tcp", peername);
}
/*
* Syslog over TCP RFC 6587 3.4.1. Octet Counting
*/
int
octet_counting(struct evbuffer *evbuf, char **msg, int drain)
{
char *p, *buf, *end;
int len;
buf = EVBUFFER_DATA(evbuf);
end = buf + EVBUFFER_LENGTH(evbuf);
/*
* It can be assumed that octet-counting framing is used if a syslog
* frame starts with a digit.
*/
if (buf >= end || !isdigit((unsigned char)*buf))
return (-1);
/*
* SYSLOG-FRAME = MSG-LEN SP SYSLOG-MSG
* MSG-LEN is the octet count of the SYSLOG-MSG in the SYSLOG-FRAME.
* We support up to 5 digits in MSG-LEN, so the maximum is 99999.
*/
for (p = buf; p < end && p < buf + 5; p++) {
if (!isdigit((unsigned char)*p))
break;
}
if (buf >= p || p >= end || *p != ' ')
return (-1);
p++;
/* Using atoi() is safe as buf starts with 1 to 5 digits and a space. */
len = atoi(buf);
if (drain)
log_debugadd(" octet counting %d", len);
if (p + len > end)
return (0);
if (drain)
evbuffer_drain(evbuf, p - buf);
if (msg)
*msg = p;
return (len);
}
/*
* Syslog over TCP RFC 6587 3.4.2. Non-Transparent-Framing
*/
int
non_transparent_framing(struct evbuffer *evbuf, char **msg)
{
char *p, *buf, *end;
buf = EVBUFFER_DATA(evbuf);
end = buf + EVBUFFER_LENGTH(evbuf);
/*
* The TRAILER has usually been a single character and most often
* is ASCII LF (%d10). However, other characters have also been
* seen, with ASCII NUL (%d00) being a prominent example.
*/
for (p = buf; p < end; p++) {
if (*p == '\0' || *p == '\n')
break;
}
if (p + 1 - buf >= INT_MAX)
return (-1);
log_debugadd(" non transparent framing");
if (p >= end)
return (0);
/*
* Some devices have also been seen to emit a two-character
* TRAILER, which is usually CR and LF.
*/
if (buf < p && p[0] == '\n' && p[-1] == '\r')
p[-1] = '\0';
if (msg)
*msg = buf;
return (p + 1 - buf);
}
void
tcp_readcb(struct bufferevent *bufev, void *arg)
{
struct peer *p = arg;
char *msg;
int len;
while (EVBUFFER_LENGTH(bufev->input) > 0) {
log_debugadd("%s logger \"%s\"", p->p_ctx ? "tls" : "tcp",
p->p_peername);
msg = NULL;
len = octet_counting(bufev->input, &msg, 1);
if (len < 0)
len = non_transparent_framing(bufev->input, &msg);
if (len < 0)
log_debugadd("unknown method");
if (msg == NULL) {
log_debugadd(", incomplete frame");
break;
}
log_debug(", use %d bytes", len);
if (len > 0 && msg[len-1] == '\n')
msg[len-1] = '\0';
if (len == 0 || msg[len-1] != '\0') {
memcpy(linebuf, msg, MINIMUM(len, LOG_MAXLINE));
linebuf[MINIMUM(len, LOG_MAXLINE)] = '\0';
msg = linebuf;
}
printline(p->p_hostname, msg);
evbuffer_drain(bufev->input, len);
}
/* Maximum frame has 5 digits, 1 space, MAXLINE chars, 1 new line. */
if (EVBUFFER_LENGTH(bufev->input) >= 5 + 1 + LOG_MAXLINE + 1) {
log_debug(", use %zu bytes", EVBUFFER_LENGTH(bufev->input));
EVBUFFER_DATA(bufev->input)[5 + 1 + LOG_MAXLINE] = '\0';
printline(p->p_hostname, EVBUFFER_DATA(bufev->input));
evbuffer_drain(bufev->input, -1);
} else if (EVBUFFER_LENGTH(bufev->input) > 0)
log_debug(", buffer %zu bytes", EVBUFFER_LENGTH(bufev->input));
}
void
tcp_closecb(struct bufferevent *bufev, short event, void *arg)
{
struct peer *p = arg;
if (event & EVBUFFER_EOF) {
log_info(LOG_DEBUG, "%s logger \"%s\" connection close",
p->p_ctx ? "tls" : "tcp", p->p_peername);
} else {
log_info(LOG_NOTICE, "%s logger \"%s\" connection error: %s",
p->p_ctx ? "tls" : "tcp", p->p_peername,
p->p_ctx ? tls_error(p->p_ctx) : strerror(errno));
}
if (p->p_peername != hostname_unknown)
free(p->p_peername);
if (p->p_hostname != hostname_unknown)
free(p->p_hostname);
bufferevent_free(p->p_bufev);
close(p->p_fd);
free(p);
}
int
tcp_socket(struct filed *f)
{
int s;
if ((s = socket(f->f_un.f_forw.f_addr.ss_family,
SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP)) == -1) {
log_warn("socket \"%s\"", f->f_un.f_forw.f_loghost);
return (-1);
}
set_sockbuf(s);
if (connect(s, (struct sockaddr *)&f->f_un.f_forw.f_addr,
f->f_un.f_forw.f_addr.ss_len) == -1 && errno != EINPROGRESS) {
log_warn("connect \"%s\"", f->f_un.f_forw.f_loghost);
close(s);
return (-1);
}
return (s);
}
void
tcp_dropcb(struct bufferevent *bufev, void *arg)
{
struct filed *f = arg;
/*
* Drop data received from the forward log server.
*/
log_debug("loghost \"%s\" did send %zu bytes back",
f->f_un.f_forw.f_loghost, EVBUFFER_LENGTH(bufev->input));
evbuffer_drain(bufev->input, -1);
}
void
tcp_writecb(struct bufferevent *bufev, void *arg)
{
struct filed *f = arg;
char ebuf[ERRBUFSIZE];
/*
* Successful write, connection to server is good, reset wait time.
*/
log_debug("loghost \"%s\" successful write", f->f_un.f_forw.f_loghost);
f->f_un.f_forw.f_retrywait = 0;
if (f->f_dropped > 0 &&
EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) < MAX_TCPBUF) {
snprintf(ebuf, sizeof(ebuf), "to loghost \"%s\"",
f->f_un.f_forw.f_loghost);
dropped_warn(&f->f_dropped, ebuf);
}
}
void
tcp_errorcb(struct bufferevent *bufev, short event, void *arg)
{
struct filed *f = arg;
char *p, *buf, *end;
int l;
char ebuf[ERRBUFSIZE];
if (event & EVBUFFER_EOF)
snprintf(ebuf, sizeof(ebuf), "loghost \"%s\" connection close",
f->f_un.f_forw.f_loghost);
else
snprintf(ebuf, sizeof(ebuf),
"loghost \"%s\" connection error: %s",
f->f_un.f_forw.f_loghost, f->f_un.f_forw.f_ctx ?
tls_error(f->f_un.f_forw.f_ctx) : strerror(errno));
log_debug("%s", ebuf);
/* The SIGHUP handler may also close the socket, so invalidate it. */
if (f->f_un.f_forw.f_ctx) {
tls_close(f->f_un.f_forw.f_ctx);
tls_free(f->f_un.f_forw.f_ctx);
f->f_un.f_forw.f_ctx = NULL;
}
bufferevent_disable(bufev, EV_READ|EV_WRITE);
close(f->f_file);
f->f_file = -1;
/*
* The messages in the output buffer may be out of sync.
* Check that the buffer starts with "1234 <1234 octets>\n".
* Otherwise remove the partial message from the beginning.
*/
buf = EVBUFFER_DATA(bufev->output);
end = buf + EVBUFFER_LENGTH(bufev->output);
if (buf < end && !((l = octet_counting(bufev->output, &p, 0)) > 0 &&
p[l-1] == '\n')) {
for (p = buf; p < end; p++) {
if (*p == '\n') {
evbuffer_drain(bufev->output, p - buf + 1);
break;
}
}
/* Without '\n' discard everything. */
if (p == end)
evbuffer_drain(bufev->output, -1);
log_debug("loghost \"%s\" dropped partial message",
f->f_un.f_forw.f_loghost);
f->f_dropped++;
}
loghost_retry(f);
/* Log the connection error to the fresh buffer after reconnecting. */
log_info(LOG_WARNING, "%s", ebuf);
}
void
tcp_connectcb(int fd, short event, void *arg)
{
struct filed *f = arg;
struct bufferevent *bufev = f->f_un.f_forw.f_bufev;
int s;
if (f->f_un.f_forw.f_addr.ss_family == AF_UNSPEC) {
if (loghost_resolve(f) != 0) {
loghost_retry(f);
return;
}
}
if ((s = tcp_socket(f)) == -1) {
loghost_retry(f);
return;
}
log_debug("tcp connect callback: socket success, event %#x", event);
f->f_file = s;
bufferevent_setfd(bufev, s);
bufferevent_setcb(bufev, tcp_dropcb, tcp_writecb, tcp_errorcb, f);
/*
* Although syslog is a write only protocol, enable reading from
* the socket to detect connection close and errors.
*/
bufferevent_enable(bufev, EV_READ|EV_WRITE);
if (f->f_type == F_FORWTLS) {
if ((f->f_un.f_forw.f_ctx = tls_client()) == NULL) {
log_warn("tls_client \"%s\"", f->f_un.f_forw.f_loghost);
goto error;
}
if (client_config &&
tls_configure(f->f_un.f_forw.f_ctx, client_config) == -1) {
log_warnx("tls_configure \"%s\": %s",
f->f_un.f_forw.f_loghost,
tls_error(f->f_un.f_forw.f_ctx));
goto error;
}
if (tls_connect_socket(f->f_un.f_forw.f_ctx, s,
f->f_un.f_forw.f_host) == -1) {
log_warnx("tls_connect_socket \"%s\": %s",
f->f_un.f_forw.f_loghost,
tls_error(f->f_un.f_forw.f_ctx));
goto error;
}
log_debug("tcp connect callback: tls context success");
buffertls_set(&f->f_un.f_forw.f_buftls, bufev,
f->f_un.f_forw.f_ctx, s);
buffertls_connect(&f->f_un.f_forw.f_buftls, s);
}
return;
error:
if (f->f_un.f_forw.f_ctx) {
tls_free(f->f_un.f_forw.f_ctx);
f->f_un.f_forw.f_ctx = NULL;
}
bufferevent_disable(bufev, EV_READ|EV_WRITE);
close(f->f_file);
f->f_file = -1;
loghost_retry(f);
}
int
loghost_resolve(struct filed *f)
{
char hostname[NI_MAXHOST];
int error;
error = priv_getaddrinfo(f->f_un.f_forw.f_ipproto,
f->f_un.f_forw.f_host, f->f_un.f_forw.f_port,
(struct sockaddr *)&f->f_un.f_forw.f_addr,
sizeof(f->f_un.f_forw.f_addr));
if (error) {
log_warnx("bad hostname \"%s\"", f->f_un.f_forw.f_loghost);
f->f_un.f_forw.f_addr.ss_family = AF_UNSPEC;
return (error);
}
error = getnameinfo((struct sockaddr *)&f->f_un.f_forw.f_addr,
f->f_un.f_forw.f_addr.ss_len, hostname, sizeof(hostname), NULL, 0,
NI_NUMERICHOST | NI_NUMERICSERV |
(strncmp(f->f_un.f_forw.f_ipproto, "udp", 3) == 0 ? NI_DGRAM : 0));
if (error) {
log_warnx("malformed UDP address loghost \"%s\": %s",
f->f_un.f_forw.f_loghost, gai_strerror(error));
strlcpy(hostname, hostname_unknown, sizeof(hostname));
}
log_debug("resolved loghost \"%s\" address %s",
f->f_un.f_forw.f_loghost, hostname);
return (0);
}
void
loghost_retry(struct filed *f)
{
struct timeval to;
if (f->f_un.f_forw.f_retrywait == 0)
f->f_un.f_forw.f_retrywait = 1;
else
f->f_un.f_forw.f_retrywait <<= 1;
if (f->f_un.f_forw.f_retrywait > 600)
f->f_un.f_forw.f_retrywait = 600;
to.tv_sec = f->f_un.f_forw.f_retrywait;
to.tv_usec = 0;
evtimer_add(&f->f_un.f_forw.f_ev, &to);
log_debug("retry loghost \"%s\" wait %d",
f->f_un.f_forw.f_loghost, f->f_un.f_forw.f_retrywait);
}
void
udp_resolvecb(int fd, short event, void *arg)
{
struct filed *f = arg;
struct timeval to;
if (loghost_resolve(f) != 0) {
loghost_retry(f);
return;
}
switch (f->f_un.f_forw.f_addr.ss_family) {
case AF_INET:
f->f_file = fd_udp;
break;
case AF_INET6:
f->f_file = fd_udp6;
break;
}
f->f_un.f_forw.f_retrywait = 0;
if (f->f_dropped > 0) {
char ebuf[ERRBUFSIZE];
snprintf(ebuf, sizeof(ebuf), "to udp loghost \"%s\"",
f->f_un.f_forw.f_loghost);
dropped_warn(&f->f_dropped, ebuf);
}
}
int
tcpbuf_countmsg(struct bufferevent *bufev)
{
char *p, *buf, *end;
int i = 0;
buf = EVBUFFER_DATA(bufev->output);
end = buf + EVBUFFER_LENGTH(bufev->output);
for (p = buf; p < end; p++) {
if (*p == '\n')
i++;
}
return (i);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: syslogd [-46dFhnruVZ] [-a path] [-C CAfile]\n"
"\t[-c cert_file] [-f config_file] [-K CAfile] [-k key_file]\n"
"\t[-m mark_interval] [-p log_socket] [-S listen_address]\n"
"\t[-s reporting_socket] [-T listen_address] [-U bind_address]\n");
exit(1);
}
/*
* Take a raw input line, decode the message, and print the message
* on the appropriate log files.
*/
void
printline(char *hname, char *msgstr)
{
struct msg msg;
char *p, *q, line[LOG_MAXLINE + 4 + 1]; /* message, encoding, NUL */
p = msgstr;
for (q = line; *p && q < &line[LOG_MAXLINE]; p++) {
if (*p == '\n')
*q++ = ' ';
else
q = vis(q, *p, VIS_NOSLASH, 0);
}
line[LOG_MAXLINE] = *q = '\0';
parsemsg(line, &msg);
if (msg.m_pri == -1)
msg.m_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 (LOG_FAC(msg.m_pri) == LOG_KERN)
msg.m_pri = LOG_USER | LOG_PRI(msg.m_pri);
if (msg.m_timestamp[0] == '\0')
current_time(msg.m_timestamp);
logmsg(&msg, 0, hname);
}
/*
* Take a raw input line from /dev/klog, split and format similar to syslog().
*/
void
printsys(char *msgstr)
{
struct msg msg;
int c, flags;
char *lp, *p, *q;
size_t prilen;
int l;
current_time(msg.m_timestamp);
strlcpy(msg.m_prog, _PATH_UNIX, sizeof(msg.m_prog));
l = snprintf(msg.m_msg, sizeof(msg.m_msg), "%s: ", _PATH_UNIX);
if (l < 0 || l >= sizeof(msg.m_msg)) {
msg.m_msg[0] = '\0';
l = 0;
}
lp = msg.m_msg + l;
for (p = msgstr; *p != '\0'; ) {
flags = SYNC_FILE; /* fsync file after write */
msg.m_pri = DEFSPRI;
prilen = parsemsg_priority(p, &msg.m_pri);
p += prilen;
if (prilen == 0) {
/* kernel printf's come out on console */
flags |= IGN_CONS;
}
if (msg.m_pri &~ (LOG_FACMASK|LOG_PRIMASK))
msg.m_pri = DEFSPRI;
q = lp;
while (*p && (c = *p++) != '\n' &&
q < &msg.m_msg[sizeof(msg.m_msg) - 4])
q = vis(q, c, VIS_NOSLASH, 0);
logmsg(&msg, flags, LocalHostName);
}
}
void
vlogmsg(int pri, const char *prog, const char *fmt, va_list ap)
{
struct msg msg;
int l;
msg.m_pri = pri;
current_time(msg.m_timestamp);
strlcpy(msg.m_prog, prog, sizeof(msg.m_prog));
l = snprintf(msg.m_msg, sizeof(msg.m_msg), "%s[%d]: ", prog, getpid());
if (l < 0 || l >= sizeof(msg.m_msg))
l = 0;
l = vsnprintf(msg.m_msg + l, sizeof(msg.m_msg) - l, fmt, ap);
if (l < 0)
strlcpy(msg.m_msg, fmt, sizeof(msg.m_msg));
if (!Started) {
fprintf(stderr, "%s\n", msg.m_msg);
init_dropped++;
return;
}
logmsg(&msg, 0, LocalHostName);
}
struct timeval now;
void
current_time(char *timestamp)
{
(void)gettimeofday(&now, NULL);
if (ZuluTime) {
struct tm *tm;
size_t l;
tm = gmtime(&now.tv_sec);
l = strftime(timestamp, 33, "%FT%T", tm);
/*
* Use only millisecond precision as some time has
* passed since syslog(3) was called.
*/
snprintf(timestamp + l, 33 - l, ".%03ldZ", now.tv_usec / 1000);
} else
strlcpy(timestamp, ctime(&now.tv_sec) + 4, 16);
}
/*
* Log a message to the appropriate log files, users, etc. based on
* the priority.
*/
void
logmsg(struct msg *msg, int flags, char *from)
{
struct filed *f;
int fac, msglen, prilev;
(void)gettimeofday(&now, NULL);
log_debug("logmsg: pri 0%o, flags 0x%x, from %s, prog %s, msg %s",
msg->m_pri, flags, from, msg->m_prog, msg->m_msg);
/* extract facility and priority level */
if (flags & MARK)
fac = LOG_NFACILITIES;
else
fac = LOG_FAC(msg->m_pri);
prilev = LOG_PRI(msg->m_pri);
/* log the message to the particular outputs */
if (!Initialized) {
f = &consfile;
if (f->f_type == F_CONSOLE) {
strlcpy(f->f_lasttime, msg->m_timestamp,
sizeof(f->f_lasttime));
strlcpy(f->f_prevhost, from,
sizeof(f->f_prevhost));
fprintlog(f, flags, msg->m_msg);
/* May be set to F_UNUSED, try again next time. */
f->f_type = F_CONSOLE;
}
init_dropped++;
return;
}
/* log the message to the particular outputs */
msglen = strlen(msg->m_msg);
SIMPLEQ_FOREACH(f, &Files, f_next) {
/* skip messages that are incorrect priority */
if (f->f_pmask[fac] < prilev ||
f->f_pmask[fac] == INTERNAL_NOPRI)
continue;
/* skip messages with the incorrect program or hostname */
if (f->f_program && fnmatch(f->f_program, msg->m_prog, 0) != 0)
continue;
if (f->f_hostname && fnmatch(f->f_hostname, from, 0) != 0)
continue;
if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
continue;
/* don't output marks to recently written files */
if ((flags & MARK) &&
(now.tv_sec - f->f_time) < MarkInterval / 2)
continue;
/*
* suppress duplicate lines to this file
*/
if ((Repeat == 0 || (Repeat == 1 &&
(f->f_type != F_PIPE && f->f_type != F_FORWUDP &&
f->f_type != F_FORWTCP && f->f_type != F_FORWTLS))) &&
(flags & MARK) == 0 && msglen == f->f_prevlen &&
f->f_dropped == 0 &&
!strcmp(msg->m_msg, f->f_prevline) &&
!strcmp(from, f->f_prevhost)) {
strlcpy(f->f_lasttime, msg->m_timestamp,
sizeof(f->f_lasttime));
f->f_prevcount++;
log_debug("msg repeated %d times, %ld sec of %d",
f->f_prevcount, (long)(now.tv_sec - 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.tv_sec > 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 = msg->m_pri;
strlcpy(f->f_lasttime, msg->m_timestamp,
sizeof(f->f_lasttime));
strlcpy(f->f_prevhost, from,
sizeof(f->f_prevhost));
if (msglen < MAXSVLINE) {
f->f_prevlen = msglen;
strlcpy(f->f_prevline, msg->m_msg,
sizeof(f->f_prevline));
fprintlog(f, flags, (char *)NULL);
} else {
f->f_prevline[0] = 0;
f->f_prevlen = 0;
fprintlog(f, flags, msg->m_msg);
}
}
if (f->f_quick)
break;
}
}
void
fprintlog(struct filed *f, int flags, char *msg)
{
struct iovec iov[IOVCNT], *v;
struct msghdr msghdr;
int l, retryonce;
char line[LOG_MAXLINE + 1], pribuf[13], greetings[500], repbuf[80];
char ebuf[ERRBUFSIZE];
v = iov;
switch (f->f_type) {
case F_FORWUDP:
case F_FORWTCP:
case F_FORWTLS:
l = snprintf(pribuf, sizeof(pribuf), "<%d>", f->f_prevpri);
if (l < 0)
l = strlcpy(pribuf, "<13>", sizeof(pribuf));
if (l >= sizeof(pribuf))
l = sizeof(pribuf) - 1;
v->iov_base = pribuf;
v->iov_len = l;
break;
case F_WALL:
l = snprintf(greetings, sizeof(greetings),
"\r\n\7Message from syslogd@%s at %.24s ...\r\n",
f->f_prevhost, ctime(&now.tv_sec));
if (l < 0)
l = strlcpy(greetings,
"\r\n\7Message from syslogd ...\r\n",
sizeof(greetings));
if (l >= sizeof(greetings))
l = sizeof(greetings) - 1;
v->iov_base = greetings;
v->iov_len = l;
break;
default:
v->iov_base = "";
v->iov_len = 0;
break;
}
v++;
if (f->f_lasttime[0] != '\0') {
v->iov_base = f->f_lasttime;
v->iov_len = strlen(f->f_lasttime);
v++;
v->iov_base = " ";
v->iov_len = 1;
} else {
v->iov_base = "";
v->iov_len = 0;
v++;
v->iov_base = "";
v->iov_len = 0;
}
v++;
switch (f->f_type) {
case F_FORWUDP:
case F_FORWTCP:
case F_FORWTLS:
if (IncludeHostname) {
v->iov_base = LocalHostName;
v->iov_len = strlen(LocalHostName);
v++;
v->iov_base = " ";
v->iov_len = 1;
} else {
/* XXX RFC requires to include host name */
v->iov_base = "";
v->iov_len = 0;
v++;
v->iov_base = "";
v->iov_len = 0;
}
break;
default:
if (f->f_prevhost[0] != '\0') {
v->iov_base = f->f_prevhost;
v->iov_len = strlen(v->iov_base);
v++;
v->iov_base = " ";
v->iov_len = 1;
} else {
v->iov_base = "";
v->iov_len = 0;
v++;
v->iov_base = "";
v->iov_len = 0;
}
break;
}
v++;
if (msg) {
v->iov_base = msg;
v->iov_len = strlen(msg);
} else if (f->f_prevcount > 1) {
l = snprintf(repbuf, sizeof(repbuf),
"last message repeated %d times", f->f_prevcount);
if (l < 0)
l = strlcpy(repbuf, "last message repeated",
sizeof(repbuf));
if (l >= sizeof(repbuf))
l = sizeof(repbuf) - 1;
v->iov_base = repbuf;
v->iov_len = l;
} else {
v->iov_base = f->f_prevline;
v->iov_len = f->f_prevlen;
}
v++;
switch (f->f_type) {
case F_CONSOLE:
case F_TTY:
case F_USERS:
case F_WALL:
v->iov_base = "\r\n";
v->iov_len = 2;
break;
case F_FILE:
case F_PIPE:
case F_FORWTCP:
case F_FORWTLS:
v->iov_base = "\n";
v->iov_len = 1;
break;
default:
v->iov_base = "";
v->iov_len = 0;
break;
}
v = NULL;
log_debugadd("Logging to %s", TypeNames[f->f_type]);
f->f_time = now.tv_sec;
switch (f->f_type) {
case F_UNUSED:
log_debug("");
break;
case F_FORWUDP:
log_debugadd(" %s", f->f_un.f_forw.f_loghost);
if (f->f_un.f_forw.f_addr.ss_family == AF_UNSPEC) {
log_debug(" (dropped not resolved)");
f->f_dropped++;
break;
}
l = iov[0].iov_len + iov[1].iov_len + iov[2].iov_len +
iov[3].iov_len + iov[4].iov_len + iov[5].iov_len +
iov[6].iov_len;
if (l > MAX_UDPMSG) {
l -= MAX_UDPMSG;
if (iov[5].iov_len > l)
iov[5].iov_len -= l;
else
iov[5].iov_len = 0;
}
memset(&msghdr, 0, sizeof(msghdr));
msghdr.msg_name = &f->f_un.f_forw.f_addr;
msghdr.msg_namelen = f->f_un.f_forw.f_addr.ss_len;
msghdr.msg_iov = iov;
msghdr.msg_iovlen = IOVCNT;
if (sendmsg(f->f_file, &msghdr, 0) == -1) {
switch (errno) {
case EACCES:
case EADDRNOTAVAIL:
case EHOSTDOWN:
case EHOSTUNREACH:
case ENETDOWN:
case ENETUNREACH:
case ENOBUFS:
case EWOULDBLOCK:
log_debug(" (dropped send error)");
f->f_dropped++;
/* silently dropped */
break;
default:
log_debug(" (dropped permanent send error)");
f->f_dropped++;
f->f_type = F_UNUSED;
snprintf(ebuf, sizeof(ebuf),
"to udp loghost \"%s\"",
f->f_un.f_forw.f_loghost);
dropped_warn(&f->f_dropped, ebuf);
log_warn("loghost \"%s\" disabled, sendmsg",
f->f_un.f_forw.f_loghost);
break;
}
} else {
log_debug("");
if (f->f_dropped > 0) {
snprintf(ebuf, sizeof(ebuf),
"to udp loghost \"%s\"",
f->f_un.f_forw.f_loghost);
dropped_warn(&f->f_dropped, ebuf);
}
}
break;
case F_FORWTCP:
case F_FORWTLS:
log_debugadd(" %s", f->f_un.f_forw.f_loghost);
if (EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) >=
MAX_TCPBUF) {
log_debug(" (dropped tcpbuf full)");
f->f_dropped++;
break;
}
/*
* Syslog over TLS RFC 5425 4.3. Sending Data
* Syslog over TCP RFC 6587 3.4.1. Octet Counting
* Use an additional '\n' to split messages. This allows
* buffer synchronisation, helps legacy implementations,
* and makes line based testing easier.
*/
l = evbuffer_add_printf(f->f_un.f_forw.f_bufev->output,
"%zu %s%s%s%s%s%s%s", iov[0].iov_len +
iov[1].iov_len + iov[2].iov_len +
iov[3].iov_len + iov[4].iov_len +
iov[5].iov_len + iov[6].iov_len,
(char *)iov[0].iov_base,
(char *)iov[1].iov_base, (char *)iov[2].iov_base,
(char *)iov[3].iov_base, (char *)iov[4].iov_base,
(char *)iov[5].iov_base, (char *)iov[6].iov_base);
if (l < 0) {
log_debug(" (dropped evbuffer add)");
f->f_dropped++;
break;
}
bufferevent_enable(f->f_un.f_forw.f_bufev, EV_WRITE);
log_debug("");
break;
case F_CONSOLE:
if (flags & IGN_CONS) {
log_debug(" (ignored)");
break;
}
/* FALLTHROUGH */
case F_TTY:
case F_FILE:
case F_PIPE:
log_debug(" %s", f->f_un.f_fname);
retryonce = 0;
again:
if (writev(f->f_file, iov, IOVCNT) == -1) {
int e = errno;
/* allow to recover from file system full */
if (e == ENOSPC && f->f_type == F_FILE) {
if (f->f_dropped++ == 0) {
f->f_type = F_UNUSED;
errno = e;
log_warn("write to file \"%s\"",
f->f_un.f_fname);
f->f_type = F_FILE;
}
break;
}
/* pipe is non-blocking. log and drop message if full */
if (e == EAGAIN && f->f_type == F_PIPE) {
if (now.tv_sec - f->f_lasterrtime > 120) {
f->f_lasterrtime = now.tv_sec;
log_warn("write to pipe \"%s\"",
f->f_un.f_fname);
}
break;
}
/*
* Check for errors on TTY's or program pipes.
* Errors happen due to loss of tty or died programs.
*/
if (e == EAGAIN) {
/*
* Silently drop messages on blocked write.
* This can happen when logging to a locked tty.
*/
break;
}
(void)close(f->f_file);
if ((e == EIO || e == EBADF) &&
f->f_type != F_FILE && f->f_type != F_PIPE &&
!retryonce) {
f->f_file = priv_open_tty(f->f_un.f_fname);
retryonce = 1;
if (f->f_file < 0) {
f->f_type = F_UNUSED;
log_warn("priv_open_tty \"%s\"",
f->f_un.f_fname);
} else
goto again;
} else if ((e == EPIPE || e == EBADF) &&
f->f_type == F_PIPE && !retryonce) {
f->f_file = priv_open_log(f->f_un.f_fname);
retryonce = 1;
if (f->f_file < 0) {
f->f_type = F_UNUSED;
log_warn("priv_open_log \"%s\"",
f->f_un.f_fname);
} else
goto again;
} else {
f->f_type = F_UNUSED;
f->f_file = -1;
errno = e;
log_warn("writev \"%s\"", f->f_un.f_fname);
}
} else {
if (flags & SYNC_FILE)
(void)fsync(f->f_file);
if (f->f_dropped > 0 && f->f_type == F_FILE) {
snprintf(ebuf, sizeof(ebuf), "to file \"%s\"",
f->f_un.f_fname);
dropped_warn(&f->f_dropped, ebuf);
}
}
break;
case F_USERS:
case F_WALL:
log_debug("");
wallmsg(f, iov);
break;
case F_MEMBUF:
log_debug("");
l = snprintf(line, sizeof(line),
"%s%s%s%s%s%s%s", (char *)iov[0].iov_base,
(char *)iov[1].iov_base, (char *)iov[2].iov_base,
(char *)iov[3].iov_base, (char *)iov[4].iov_base,
(char *)iov[5].iov_base, (char *)iov[6].iov_base);
if (l < 0)
l = strlcpy(line, iov[5].iov_base, sizeof(line));
if (ringbuf_append_line(f->f_un.f_mb.f_rb, line) == 1)
f->f_un.f_mb.f_overflow = 1;
if (f->f_un.f_mb.f_attached)
ctlconn_logto(line);
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)
{
struct utmp ut;
char utline[sizeof(ut.ut_line) + 1];
static int reenter; /* avoid calling ourselves */
FILE *uf;
int i;
if (reenter++)
return;
if ((uf = priv_open_utmp()) == NULL) {
log_warn("priv_open_utmp");
reenter = 0;
return;
}
while (fread(&ut, sizeof(ut), 1, uf) == 1) {
if (ut.ut_name[0] == '\0')
continue;
/* must use strncpy since ut_* may not be NUL terminated */
strncpy(utline, ut.ut_line, sizeof(utline) - 1);
utline[sizeof(utline) - 1] = '\0';
if (f->f_type == F_WALL) {
ttymsg(utline, iov);
continue;
}
/* should we send the message to this user? */
for (i = 0; i < MAXUNAMES; i++) {
if (!f->f_un.f_uname[i][0])
break;
if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
UT_NAMESIZE)) {
ttymsg(utline, iov);
break;
}
}
}
(void)fclose(uf);
reenter = 0;
}
/*
* Return a printable representation of a host address.
*/
void
cvthname(struct sockaddr *f, char *result, size_t res_len)
{
int error;
error = getnameinfo(f, f->sa_len, result, res_len, NULL, 0,
NI_NUMERICHOST | NI_NUMERICSERV | NI_DGRAM);
if (error) {
log_warnx("malformed UDP from address: %s",
gai_strerror(error));
strlcpy(result, hostname_unknown, res_len);
return;
}
log_debug("cvthname(%s)", result);
if (NoDNS)
return;
if (priv_getnameinfo(f, f->sa_len, result, res_len) != 0)
log_debug("Host name for from address (%s) unknown", result);
}
void
die_signalcb(int signum, short event, void *arg)
{
die(signum);
}
void
mark_timercb(int unused, short event, void *arg)
{
struct event *ev = arg;
struct timeval to;
markit();
to.tv_sec = TIMERINTVL;
to.tv_usec = 0;
evtimer_add(ev, &to);
}
void
init_signalcb(int signum, short event, void *arg)
{
init();
log_info(LOG_INFO, "restart");
dropped_warn(&udpsend_dropped, "to udp loghost");
dropped_warn(&tcpbuf_dropped, "to remote loghost");
dropped_warn(&file_dropped, "to file");
log_debug("syslogd: restarted");
}
void
logevent(int severity, const char *msg)
{
log_debug("libevent: [%d] %s", severity, msg);
}
void
dropped_warn(int *count, const char *what)
{
int dropped;
if (*count == 0)
return;
dropped = *count;
*count = 0;
log_info(LOG_WARNING, "dropped %d message%s %s",
dropped, dropped == 1 ? "" : "s", what);
}
__dead void
die(int signo)
{
struct filed *f;
SIMPLEQ_FOREACH(f, &Files, f_next) {
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
if (f->f_type == F_FORWUDP) {
udpsend_dropped += f->f_dropped;
f->f_dropped = 0;
}
if (f->f_type == F_FORWTLS || f->f_type == F_FORWTCP) {
tcpbuf_dropped += f->f_dropped +
tcpbuf_countmsg(f->f_un.f_forw.f_bufev);
f->f_dropped = 0;
}
if (f->f_type == F_FILE) {
file_dropped += f->f_dropped;
f->f_dropped = 0;
}
}
dropped_warn(&init_dropped, "during initialization");
dropped_warn(&udpsend_dropped, "to udp loghost");
dropped_warn(&tcpbuf_dropped, "to remote loghost");
dropped_warn(&file_dropped, "to file");
if (signo)
log_info(LOG_ERR, "exiting on signal %d", signo);
log_debug("syslogd: exited");
exit(0);
}
/*
* INIT -- Initialize syslogd from configuration table
*/
void
init(void)
{
char progblock[NAME_MAX+1], hostblock[NAME_MAX+1], *cline, *p, *q;
struct filed_list mb;
struct filed *f, *m;
FILE *cf;
int i;
size_t s;
log_debug("init");
/* If config file has been modified, then just die to restart */
if (priv_config_modified()) {
log_debug("config file changed: dying");
die(0);
}
/*
* Close all open log files.
*/
Initialized = 0;
SIMPLEQ_INIT(&mb);
while (!SIMPLEQ_EMPTY(&Files)) {
f = SIMPLEQ_FIRST(&Files);
SIMPLEQ_REMOVE_HEAD(&Files, f_next);
/* flush any pending output */
if (f->f_prevcount)
fprintlog(f, 0, (char *)NULL);
switch (f->f_type) {
case F_FORWUDP:
evtimer_del(&f->f_un.f_forw.f_ev);
udpsend_dropped += f->f_dropped;
f->f_dropped = 0;
free(f->f_un.f_forw.f_ipproto);
free(f->f_un.f_forw.f_host);
free(f->f_un.f_forw.f_port);
break;
case F_FORWTLS:
if (f->f_un.f_forw.f_ctx) {
tls_close(f->f_un.f_forw.f_ctx);
tls_free(f->f_un.f_forw.f_ctx);
}
/* FALLTHROUGH */
case F_FORWTCP:
evtimer_del(&f->f_un.f_forw.f_ev);
tcpbuf_dropped += f->f_dropped;
if (f->f_un.f_forw.f_bufev) {
bufferevent_disable(f->f_un.f_forw.f_bufev,
EV_READ|EV_WRITE);
tcpbuf_dropped +=
tcpbuf_countmsg(f->f_un.f_forw.f_bufev);
bufferevent_free(f->f_un.f_forw.f_bufev);
}
free(f->f_un.f_forw.f_ipproto);
free(f->f_un.f_forw.f_host);
free(f->f_un.f_forw.f_port);
/* FALLTHROUGH */
case F_FILE:
if (f->f_type == F_FILE)
file_dropped += f->f_dropped;
f->f_dropped = 0;
/* FALLTHROUGH */
case F_TTY:
case F_CONSOLE:
case F_PIPE:
(void)close(f->f_file);
break;
}
free(f->f_program);
free(f->f_hostname);
if (f->f_type == F_MEMBUF) {
f->f_program = NULL;
f->f_hostname = NULL;
log_debug("add %p to mb", f);
SIMPLEQ_INSERT_HEAD(&mb, f, f_next);
} else
free(f);
}
SIMPLEQ_INIT(&Files);
/* open the configuration file */
if ((cf = priv_open_config()) == NULL) {
log_debug("cannot open %s", ConfFile);
SIMPLEQ_INSERT_TAIL(&Files,
cfline("*.ERR\t/dev/console", "*", "*"), f_next);
SIMPLEQ_INSERT_TAIL(&Files,
cfline("*.PANIC\t*", "*", "*"), f_next);
Initialized = 1;
dropped_warn(&init_dropped, "during initialization");
return;
}
/*
* Foreach line in the conf table, open that file.
*/
cline = NULL;
s = 0;
strlcpy(progblock, "*", sizeof(progblock));
strlcpy(hostblock, "*", sizeof(hostblock));
send_udp = send_udp6 = 0;
while (getline(&cline, &s, cf) != -1) {
/*
* check for end-of-section, comments, strip off trailing
* spaces and newline character. !progblock and +hostblock
* are treated specially: the following lines apply only to
* that program.
*/
for (p = cline; isspace((unsigned char)*p); ++p)
continue;
if (*p == '\0' || *p == '#')
continue;
if (*p == '!' || *p == '+') {
q = (*p == '!') ? progblock : hostblock;
p++;
while (isspace((unsigned char)*p))
p++;
if (*p == '\0' || (*p == '*' && (p[1] == '\0' ||
isspace((unsigned char)p[1])))) {
strlcpy(q, "*", NAME_MAX+1);
continue;
}
for (i = 0; i < NAME_MAX; i++) {
if (*p == '\0' || isspace((unsigned char)*p))
break;
*q++ = *p++;
}
*q = '\0';
continue;
}
p = cline + strlen(cline);
while (p > cline)
if (!isspace((unsigned char)*--p)) {
p++;
break;
}
*p = '\0';
f = cfline(cline, progblock, hostblock);
if (f != NULL)
SIMPLEQ_INSERT_TAIL(&Files, f, f_next);
}
free(cline);
if (!feof(cf))
fatal("read config file");
/* Match and initialize the memory buffers */
SIMPLEQ_FOREACH(f, &Files, f_next) {
if (f->f_type != F_MEMBUF)
continue;
log_debug("Initialize membuf %s at %p",
f->f_un.f_mb.f_mname, f);
SIMPLEQ_FOREACH(m, &mb, f_next) {
if (m->f_un.f_mb.f_rb == NULL)
continue;
if (strcmp(m->f_un.f_mb.f_mname,
f->f_un.f_mb.f_mname) == 0)
break;
}
if (m == NULL) {
log_debug("Membuf no match");
f->f_un.f_mb.f_rb = ringbuf_init(f->f_un.f_mb.f_len);
if (f->f_un.f_mb.f_rb == NULL) {
f->f_type = F_UNUSED;
log_warn("allocate membuf");
}
} else {
log_debug("Membuf match f:%p, m:%p", f, m);
f->f_un = m->f_un;
m->f_un.f_mb.f_rb = NULL;
}
}
/* make sure remaining buffers are freed */
while (!SIMPLEQ_EMPTY(&mb)) {
m = SIMPLEQ_FIRST(&mb);
SIMPLEQ_REMOVE_HEAD(&mb, f_next);
if (m->f_un.f_mb.f_rb != NULL) {
log_warnx("mismatched membuf");
ringbuf_free(m->f_un.f_mb.f_rb);
}
log_debug("Freeing membuf %p", m);
free(m);
}
/* close the configuration file */
(void)fclose(cf);
Initialized = 1;
dropped_warn(&init_dropped, "during initialization");
if (SecureMode) {
/*
* If generic UDP file descriptors are used neither
* for receiving nor for sending, close them. Then
* there is no useless *.514 in netstat.
*/
if (fd_udp != -1 && !send_udp) {
close(fd_udp);
fd_udp = -1;
}
if (fd_udp6 != -1 && !send_udp6) {
close(fd_udp6);
fd_udp6 = -1;
}
}
if (Debug) {
SIMPLEQ_FOREACH(f, &Files, 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:
case F_PIPE:
printf("%s", f->f_un.f_fname);
break;
case F_FORWUDP:
case F_FORWTCP:
case F_FORWTLS:
printf("%s", f->f_un.f_forw.f_loghost);
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;
case F_MEMBUF:
printf("%s", f->f_un.f_mb.f_mname);
break;
}
if (f->f_program || f->f_hostname)
printf(" (%s, %s)",
f->f_program ? f->f_program : "*",
f->f_hostname ? f->f_hostname : "*");
printf("\n");
}
}
}
#define progmatches(p1, p2) \
(p1 == p2 || (p1 != NULL && p2 != NULL && strcmp(p1, p2) == 0))
/*
* Spot a line with a duplicate file, pipe, console, tty, or membuf target.
*/
struct filed *
find_dup(struct filed *f)
{
struct filed *list;
SIMPLEQ_FOREACH(list, &Files, f_next) {
if (list->f_quick || f->f_quick)
continue;
switch (list->f_type) {
case F_FILE:
case F_TTY:
case F_CONSOLE:
case F_PIPE:
if (strcmp(list->f_un.f_fname, f->f_un.f_fname) == 0 &&
progmatches(list->f_program, f->f_program) &&
progmatches(list->f_hostname, f->f_hostname)) {
log_debug("duplicate %s", f->f_un.f_fname);
return (list);
}
break;
case F_MEMBUF:
if (strcmp(list->f_un.f_mb.f_mname,
f->f_un.f_mb.f_mname) == 0 &&
progmatches(list->f_program, f->f_program) &&
progmatches(list->f_hostname, f->f_hostname)) {
log_debug("duplicate membuf %s",
f->f_un.f_mb.f_mname);
return (list);
}
break;
}
}
return (NULL);
}
/*
* Crack a configuration file line
*/
struct filed *
cfline(char *line, char *progblock, char *hostblock)
{
int i, pri;
size_t rb_len;
char *bp, *p, *q, *proto, *host, *port, *ipproto;
char buf[LOG_MAXLINE];
struct filed *xf, *f, *d;
struct timeval to;
log_debug("cfline(\"%s\", f, \"%s\", \"%s\")",
line, progblock, hostblock);
if ((f = calloc(1, sizeof(*f))) == NULL)
fatal("allocate struct filed");
for (i = 0; i <= LOG_NFACILITIES; i++)
f->f_pmask[i] = INTERNAL_NOPRI;
/* save program name if any */
f->f_quick = 0;
if (*progblock == '!') {
progblock++;
f->f_quick = 1;
}
if (*hostblock == '+') {
hostblock++;
f->f_quick = 1;
}
if (strcmp(progblock, "*") != 0)
f->f_program = strdup(progblock);
if (strcmp(hostblock, "*") != 0)
f->f_hostname = strdup(hostblock);
/* scan through the list of selectors */
for (p = line; *p && *p != '\t' && *p != ' ';) {
/* find the end of this facility name list */
for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
continue;
/* collect priority name */
for (bp = buf; *q && !strchr("\t,; ", *q); )
*bp++ = *q++;
*bp = '\0';
/* skip cruft */
while (*q && strchr(",;", *q))
q++;
/* decode priority name */
if (*buf == '*')
pri = LOG_PRIMASK + 1;
else {
/* ignore trailing spaces */
for (i=strlen(buf)-1; i >= 0 && buf[i] == ' '; i--) {
buf[i]='\0';
}
pri = decode(buf, prioritynames);
if (pri < 0) {
log_warnx("unknown priority name \"%s\"", buf);
free(f);
return (NULL);
}
}
/* 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;
else {
i = decode(buf, facilitynames);
if (i < 0) {
log_warnx("unknown facility name "
"\"%s\"", buf);
free(f);
return (NULL);
}
f->f_pmask[i >> 3] = pri;
}
while (*p == ',' || *p == ' ')
p++;
}
p = q;
}
/* skip to action part */
while (*p == '\t' || *p == ' ')
p++;
switch (*p) {
case '@':
if ((strlcpy(f->f_un.f_forw.f_loghost, p,
sizeof(f->f_un.f_forw.f_loghost)) >=
sizeof(f->f_un.f_forw.f_loghost))) {
log_warnx("loghost too long \"%s\"", p);
break;
}
if (loghost_parse(++p, &proto, &host, &port) == -1) {
log_warnx("bad loghost \"%s\"",
f->f_un.f_forw.f_loghost);
break;
}
if (proto == NULL)
proto = "udp";
if (strcmp(proto, "udp") == 0) {
if (fd_udp == -1)
proto = "udp6";
if (fd_udp6 == -1)
proto = "udp4";
}
ipproto = proto;
if (strcmp(proto, "udp") == 0) {
send_udp = send_udp6 = 1;
} else if (strcmp(proto, "udp4") == 0) {
send_udp = 1;
if (fd_udp == -1) {
log_warnx("no udp4 \"%s\"",
f->f_un.f_forw.f_loghost);
break;
}
} else if (strcmp(proto, "udp6") == 0) {
send_udp6 = 1;
if (fd_udp6 == -1) {
log_warnx("no udp6 \"%s\"",
f->f_un.f_forw.f_loghost);
break;
}
} else if (strcmp(proto, "tcp") == 0 ||
strcmp(proto, "tcp4") == 0 || strcmp(proto, "tcp6") == 0) {
;
} else if (strcmp(proto, "tls") == 0) {
ipproto = "tcp";
} else if (strcmp(proto, "tls4") == 0) {
ipproto = "tcp4";
} else if (strcmp(proto, "tls6") == 0) {
ipproto = "tcp6";
} else {
log_warnx("bad protocol \"%s\"",
f->f_un.f_forw.f_loghost);
break;
}
if (strlen(host) >= NI_MAXHOST) {
log_warnx("host too long \"%s\"",
f->f_un.f_forw.f_loghost);
break;
}
if (port == NULL)
port = strncmp(proto, "tls", 3) == 0 ?
"syslog-tls" : "syslog";
if (strlen(port) >= NI_MAXSERV) {
log_warnx("port too long \"%s\"",
f->f_un.f_forw.f_loghost);
break;
}
f->f_un.f_forw.f_ipproto = strdup(ipproto);
f->f_un.f_forw.f_host = strdup(host);
f->f_un.f_forw.f_port = strdup(port);
if (f->f_un.f_forw.f_ipproto == NULL ||
f->f_un.f_forw.f_host == NULL ||
f->f_un.f_forw.f_port == NULL) {
log_warnx("strdup ipproto host port \"%s\"",
f->f_un.f_forw.f_loghost);
free(f->f_un.f_forw.f_ipproto);
free(f->f_un.f_forw.f_host);
free(f->f_un.f_forw.f_port);
break;
}
f->f_file = -1;
loghost_resolve(f);
if (strncmp(proto, "udp", 3) == 0) {
evtimer_set(&f->f_un.f_forw.f_ev, udp_resolvecb, f);
switch (f->f_un.f_forw.f_addr.ss_family) {
case AF_UNSPEC:
log_debug("resolve \"%s\" delayed",
f->f_un.f_forw.f_loghost);
to.tv_sec = 0;
to.tv_usec = 1;
evtimer_add(&f->f_un.f_forw.f_ev, &to);
break;
case AF_INET:
f->f_file = fd_udp;
break;
case AF_INET6:
f->f_file = fd_udp6;
break;
}
f->f_type = F_FORWUDP;
} else if (strncmp(ipproto, "tcp", 3) == 0) {
if ((f->f_un.f_forw.f_bufev = bufferevent_new(-1,
tcp_dropcb, tcp_writecb, tcp_errorcb, f)) == NULL) {
log_warn("bufferevent \"%s\"",
f->f_un.f_forw.f_loghost);
free(f->f_un.f_forw.f_ipproto);
free(f->f_un.f_forw.f_host);
free(f->f_un.f_forw.f_port);
break;
}
/*
* If we try to connect to a TLS server immediately
* syslogd gets an SIGPIPE as the signal handlers have
* not been set up. Delay the connection until the
* event loop is started.
*/
evtimer_set(&f->f_un.f_forw.f_ev, tcp_connectcb, f);
to.tv_sec = 0;
to.tv_usec = 1;
evtimer_add(&f->f_un.f_forw.f_ev, &to);
f->f_type = (strncmp(proto, "tls", 3) == 0) ?
F_FORWTLS : F_FORWTCP;
}
break;
case '/':
case '|':
(void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
d = find_dup(f);
if (d != NULL) {
for (i = 0; i <= LOG_NFACILITIES; i++)
if (f->f_pmask[i] != INTERNAL_NOPRI)
d->f_pmask[i] = f->f_pmask[i];
free(f);
return (NULL);
}
if (strcmp(p, ctty) == 0) {
f->f_file = priv_open_tty(p);
if (f->f_file < 0)
log_warn("priv_open_tty \"%s\"", p);
} else {
f->f_file = priv_open_log(p);
if (f->f_file < 0)
log_warn("priv_open_log \"%s\"", p);
}
if (f->f_file < 0) {
f->f_type = F_UNUSED;
break;
}
if (isatty(f->f_file)) {
if (strcmp(p, ctty) == 0)
f->f_type = F_CONSOLE;
else
f->f_type = F_TTY;
} else {
if (*p == '|')
f->f_type = F_PIPE;
else {
f->f_type = F_FILE;
/* Clear O_NONBLOCK flag on f->f_file */
if ((i = fcntl(f->f_file, F_GETFL)) != -1) {
i &= ~O_NONBLOCK;
fcntl(f->f_file, F_SETFL, i);
}
}
}
break;
case '*':
f->f_type = F_WALL;
break;
case ':':
f->f_type = F_MEMBUF;
/* Parse buffer size (in kb) */
errno = 0;
rb_len = strtoul(++p, &q, 0);
if (*p == '\0' || (errno == ERANGE && rb_len == ULONG_MAX) ||
*q != ':' || rb_len == 0) {
f->f_type = F_UNUSED;
log_warnx("strtoul \"%s\"", p);
break;
}
q++;
rb_len *= 1024;
/* Copy buffer name */
for(i = 0; (size_t)i < sizeof(f->f_un.f_mb.f_mname) - 1; i++) {
if (!isalnum((unsigned char)q[i]))
break;
f->f_un.f_mb.f_mname[i] = q[i];
}
/* Make sure buffer name is unique */
xf = find_dup(f);
/* Error on missing or non-unique name, or bad buffer length */
if (i == 0 || rb_len > MAX_MEMBUF || xf != NULL) {
f->f_type = F_UNUSED;
log_warnx("find_dup \"%s\"", p);
break;
}
/* Set buffer length */
rb_len = MAXIMUM(rb_len, MIN_MEMBUF);
f->f_un.f_mb.f_len = rb_len;
f->f_un.f_mb.f_overflow = 0;
f->f_un.f_mb.f_attached = 0;
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;
}
return (f);
}
/*
* Parse the host and port parts from a loghost string.
*/
int
loghost_parse(char *str, char **proto, char **host, char **port)
{
char *prefix = NULL;
if ((*host = strchr(str, ':')) &&
(*host)[1] == '/' && (*host)[2] == '/') {
prefix = str;
**host = '\0';
str = *host + 3;
}
if (proto)
*proto = prefix;
else if (prefix)
return (-1);
*host = str;
if (**host == '[') {
(*host)++;
str = strchr(*host, ']');
if (str == NULL)
return (-1);
*str++ = '\0';
}
*port = strrchr(str, ':');
if (*port != NULL)
*(*port)++ = '\0';
return (0);
}
/*
* 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) {
log_debug("couldn't get kern.msgbufsize");
return (0);
}
return (msgbufsize);
}
/*
* Decode a symbolic name to a numeric value
*/
int
decode(const char *name, const CODE *codetab)
{
const CODE *c;
char *p, buf[40];
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);
}
void
markit(void)
{
struct msg msg;
struct filed *f;
msg.m_pri = LOG_INFO;
current_time(msg.m_timestamp);
msg.m_prog[0] = '\0';
strlcpy(msg.m_msg, "-- MARK --", sizeof(msg.m_msg));
MarkSeq += TIMERINTVL;
if (MarkSeq >= MarkInterval) {
logmsg(&msg, MARK, LocalHostName);
MarkSeq = 0;
}
SIMPLEQ_FOREACH(f, &Files, f_next) {
if (f->f_prevcount && now.tv_sec >= REPEATTIME(f)) {
log_debug("flush %s: repeated %d times, %d sec",
TypeNames[f->f_type], f->f_prevcount,
repeatinterval[f->f_repeatcount]);
fprintlog(f, 0, (char *)NULL);
BACKOFF(f);
}
}
}
int
unix_socket(char *path, int type, mode_t mode)
{
struct sockaddr_un s_un;
int fd, optval;
mode_t old_umask;
memset(&s_un, 0, sizeof(s_un));
s_un.sun_family = AF_UNIX;
if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
sizeof(s_un.sun_path)) {
log_warnx("socket path too long \"%s\"", path);
return (-1);
}
if ((fd = socket(AF_UNIX, type, 0)) == -1) {
log_warn("socket unix \"%s\"", path);
return (-1);
}
if (Debug) {
if (connect(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == 0 ||
errno == EPROTOTYPE) {
close(fd);
errno = EISCONN;
log_warn("connect unix \"%s\"", path);
return (-1);
}
}
old_umask = umask(0177);
unlink(path);
if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
log_warn("bind unix \"%s\"", path);
umask(old_umask);
close(fd);
return (-1);
}
umask(old_umask);
if (chmod(path, mode) == -1) {
log_warn("chmod unix \"%s\"", path);
close(fd);
unlink(path);
return (-1);
}
optval = LOG_MAXLINE + PATH_MAX;
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, sizeof(optval))
== -1)
log_warn("setsockopt unix \"%s\"", path);
return (fd);
}
/*
* Increase socket buffer size in small steps to get partial success
* if we hit a kernel limit. Allow an optional final step.
*/
void
double_sockbuf(int fd, int optname, int bigsize)
{
socklen_t len;
int i, newsize, oldsize = 0;
len = sizeof(oldsize);
if (getsockopt(fd, SOL_SOCKET, optname, &oldsize, &len) == -1)
log_warn("getsockopt bufsize");
len = sizeof(newsize);
newsize = LOG_MAXLINE + 128; /* data + control */
/* allow 8 full length messages, that is 66560 bytes */
for (i = 0; i < 4; i++, newsize *= 2) {
if (newsize <= oldsize)
continue;
if (setsockopt(fd, SOL_SOCKET, optname, &newsize, len) == -1)
log_warn("setsockopt bufsize %d", newsize);
else
oldsize = newsize;
}
if (bigsize && bigsize > oldsize) {
if (setsockopt(fd, SOL_SOCKET, optname, &bigsize, len) == -1)
log_warn("setsockopt bufsize %d", bigsize);
}
}
void
set_sockbuf(int fd)
{
int size = 65536;
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) == -1)
log_warn("setsockopt sndbufsize %d", size);
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) == -1)
log_warn("setsockopt rcvbufsize %d", size);
}
void
set_keepalive(int fd)
{
int val = 1;
if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)) == -1)
log_warn("setsockopt keepalive %d", val);
}
void
ctlconn_cleanup(void)
{
struct filed *f;
close(fd_ctlconn);
fd_ctlconn = -1;
event_del(ev_ctlread);
event_del(ev_ctlwrite);
event_add(ev_ctlaccept, NULL);
if (ctl_state == CTL_WRITING_CONT_REPLY)
SIMPLEQ_FOREACH(f, &Files, f_next)
if (f->f_type == F_MEMBUF)
f->f_un.f_mb.f_attached = 0;
ctl_state = ctl_cmd_bytes = ctl_reply_offset = ctl_reply_size = 0;
}
void
ctlsock_acceptcb(int fd, short event, void *arg)
{
struct event *ev = arg;
if ((fd = reserve_accept4(fd, event, ev, ctlsock_acceptcb,
NULL, NULL, SOCK_NONBLOCK)) == -1) {
if (errno != ENFILE && errno != EMFILE &&
errno != EINTR && errno != EWOULDBLOCK &&
errno != ECONNABORTED)
log_warn("accept control socket");
return;
}
log_debug("Accepting control connection");
if (fd_ctlconn != -1)
ctlconn_cleanup();
/* Only one connection at a time */
event_del(ev);
fd_ctlconn = fd;
/* file descriptor has changed, reset event */
event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST,
ctlconn_readcb, ev_ctlread);
event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST,
ctlconn_writecb, ev_ctlwrite);
event_add(ev_ctlread, NULL);
ctl_state = CTL_READING_CMD;
ctl_cmd_bytes = 0;
}
static struct filed
*find_membuf_log(const char *name)
{
struct filed *f;
SIMPLEQ_FOREACH(f, &Files, f_next) {
if (f->f_type == F_MEMBUF &&
strcmp(f->f_un.f_mb.f_mname, name) == 0)
break;
}
return (f);
}
void
ctlconn_readcb(int fd, short event, void *arg)
{
struct filed *f;
struct ctl_reply_hdr *reply_hdr = (struct ctl_reply_hdr *)ctl_reply;
ssize_t n;
u_int32_t flags = 0;
if (ctl_state == CTL_WRITING_REPLY ||
ctl_state == CTL_WRITING_CONT_REPLY) {
/* client has closed the connection */
ctlconn_cleanup();
return;
}
retry:
n = read(fd, (char*)&ctl_cmd + ctl_cmd_bytes,
sizeof(ctl_cmd) - ctl_cmd_bytes);
switch (n) {
case -1:
if (errno == EINTR)
goto retry;
if (errno == EWOULDBLOCK)
return;
log_warn("read control socket");
/* FALLTHROUGH */
case 0:
ctlconn_cleanup();
return;
default:
ctl_cmd_bytes += n;
}
if (ctl_cmd_bytes < sizeof(ctl_cmd))
return;
if (ntohl(ctl_cmd.version) != CTL_VERSION) {
log_warnx("unknown client protocol version");
ctlconn_cleanup();
return;
}
/* Ensure that logname is \0 terminated */
if (memchr(ctl_cmd.logname, '\0', sizeof(ctl_cmd.logname)) == NULL) {
log_warnx("corrupt control socket command");
ctlconn_cleanup();
return;
}
*reply_text = '\0';
ctl_reply_size = ctl_reply_offset = 0;
memset(reply_hdr, '\0', sizeof(*reply_hdr));
ctl_cmd.cmd = ntohl(ctl_cmd.cmd);
log_debug("ctlcmd %x logname \"%s\"", ctl_cmd.cmd, ctl_cmd.logname);
switch (ctl_cmd.cmd) {
case CMD_READ:
case CMD_READ_CLEAR:
case CMD_READ_CONT:
case CMD_FLAGS:
f = find_membuf_log(ctl_cmd.logname);
if (f == NULL) {
strlcpy(reply_text, "No such log\n", MAX_MEMBUF);
} else {
if (ctl_cmd.cmd != CMD_FLAGS) {
ringbuf_to_string(reply_text, MAX_MEMBUF,
f->f_un.f_mb.f_rb);
}
if (f->f_un.f_mb.f_overflow)
flags |= CTL_HDR_FLAG_OVERFLOW;
if (ctl_cmd.cmd == CMD_READ_CLEAR) {
ringbuf_clear(f->f_un.f_mb.f_rb);
f->f_un.f_mb.f_overflow = 0;
}
if (ctl_cmd.cmd == CMD_READ_CONT) {
f->f_un.f_mb.f_attached = 1;
tailify_replytext(reply_text,
ctl_cmd.lines > 0 ? ctl_cmd.lines : 10);
} else if (ctl_cmd.lines > 0) {
tailify_replytext(reply_text, ctl_cmd.lines);
}
}
break;
case CMD_CLEAR:
f = find_membuf_log(ctl_cmd.logname);
if (f == NULL) {
strlcpy(reply_text, "No such log\n", MAX_MEMBUF);
} else {
ringbuf_clear(f->f_un.f_mb.f_rb);
if (f->f_un.f_mb.f_overflow)
flags |= CTL_HDR_FLAG_OVERFLOW;
f->f_un.f_mb.f_overflow = 0;
strlcpy(reply_text, "Log cleared\n", MAX_MEMBUF);
}
break;
case CMD_LIST:
SIMPLEQ_FOREACH(f, &Files, f_next) {
if (f->f_type == F_MEMBUF) {
strlcat(reply_text, f->f_un.f_mb.f_mname,
MAX_MEMBUF);
if (f->f_un.f_mb.f_overflow) {
strlcat(reply_text, "*", MAX_MEMBUF);
flags |= CTL_HDR_FLAG_OVERFLOW;
}
strlcat(reply_text, " ", MAX_MEMBUF);
}
}
strlcat(reply_text, "\n", MAX_MEMBUF);
break;
default:
log_warnx("unsupported control socket command");
ctlconn_cleanup();
return;
}
reply_hdr->version = htonl(CTL_VERSION);
reply_hdr->flags = htonl(flags);
ctl_reply_size = CTL_REPLY_SIZE;
log_debug("ctlcmd reply length %lu", (u_long)ctl_reply_size);
/* Otherwise, set up to write out reply */
ctl_state = (ctl_cmd.cmd == CMD_READ_CONT) ?
CTL_WRITING_CONT_REPLY : CTL_WRITING_REPLY;
event_add(ev_ctlwrite, NULL);
/* another syslogc can kick us out */
if (ctl_state == CTL_WRITING_CONT_REPLY)
event_add(ev_ctlaccept, NULL);
}
void
ctlconn_writecb(int fd, short event, void *arg)
{
struct event *ev = arg;
ssize_t n;
if (!(ctl_state == CTL_WRITING_REPLY ||
ctl_state == CTL_WRITING_CONT_REPLY)) {
/* Shouldn't be here! */
log_warnx("control socket write with bad state");
ctlconn_cleanup();
return;
}
retry:
n = write(fd, ctl_reply + ctl_reply_offset,
ctl_reply_size - ctl_reply_offset);
switch (n) {
case -1:
if (errno == EINTR)
goto retry;
if (errno == EWOULDBLOCK)
return;
if (errno != EPIPE)
log_warn("write control socket");
/* FALLTHROUGH */
case 0:
ctlconn_cleanup();
return;
default:
ctl_reply_offset += n;
}
if (ctl_reply_offset < ctl_reply_size)
return;
if (ctl_state != CTL_WRITING_CONT_REPLY) {
ctlconn_cleanup();
return;
}
/*
* Make space in the buffer for continuous writes.
* Set offset behind reply header to skip it
*/
*reply_text = '\0';
ctl_reply_offset = ctl_reply_size = CTL_REPLY_SIZE;
/* Now is a good time to report dropped lines */
if (membuf_drop) {
strlcat(reply_text, "<ENOBUFS>\n", MAX_MEMBUF);
ctl_reply_size = CTL_REPLY_SIZE;
membuf_drop = 0;
} else {
/* Nothing left to write */
event_del(ev);
}
}
/* Shorten replytext to number of lines */
void
tailify_replytext(char *replytext, int lines)
{
char *start, *nl;
int count = 0;
start = nl = replytext;
while ((nl = strchr(nl, '\n')) != NULL) {
nl++;
if (++count > lines) {
start = strchr(start, '\n');
start++;
}
}
if (start != replytext) {
int len = strlen(start);
memmove(replytext, start, len);
*(replytext + len) = '\0';
}
}
void
ctlconn_logto(char *line)
{
size_t l;
if (membuf_drop)
return;
l = strlen(line);
if (l + 2 > (CTL_REPLY_MAXSIZE - ctl_reply_size)) {
/* remember line drops for later report */
membuf_drop = 1;
return;
}
memcpy(ctl_reply + ctl_reply_size, line, l);
memcpy(ctl_reply + ctl_reply_size + l, "\n", 2);
ctl_reply_size += l + 1;
event_add(ev_ctlwrite, NULL);
}
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