diff options
Diffstat (limited to 'usr.sbin/syslogd/syslogd.c')
-rw-r--r-- | usr.sbin/syslogd/syslogd.c | 2721 |
1 files changed, 0 insertions, 2721 deletions
diff --git a/usr.sbin/syslogd/syslogd.c b/usr.sbin/syslogd/syslogd.c deleted file mode 100644 index e97f8dc..0000000 --- a/usr.sbin/syslogd/syslogd.c +++ /dev/null @@ -1,2721 +0,0 @@ -/* - * 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. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -static const char copyright[] = -"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ - The Regents of the University of California. All rights reserved.\n"; -#endif /* not lint */ - -#ifndef lint -#if 0 -static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; -#endif -#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. - */ - -#define MAXLINE 1024 /* maximum line length */ -#define MAXSVLINE 120 /* maximum saved line length */ -#define DEFUPRI (LOG_USER|LOG_NOTICE) -#define DEFSPRI (LOG_KERN|LOG_CRIT) -#define TIMERINTVL 30 /* interval for checking flush, mark */ -#define TTYMSGTIME 1 /* timeout passed to ttymsg */ - -#include <sys/param.h> -#include <sys/ioctl.h> -#include <sys/mman.h> -#include <sys/stat.h> -#include <sys/wait.h> -#include <sys/socket.h> -#include <sys/queue.h> -#include <sys/uio.h> -#include <sys/un.h> -#include <sys/time.h> -#include <sys/resource.h> -#include <sys/syslimits.h> -#include <sys/types.h> - -#include <netinet/in.h> -#include <netdb.h> -#include <arpa/inet.h> - -#include <ctype.h> -#include <err.h> -#include <errno.h> -#include <fcntl.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> - -const char *ConfFile = _PATH_LOGCONF; -const char *PidFile = _PATH_LOGPID; -const char ctty[] = _PATH_CONSOLE; - -#define dprintf if (Debug) printf - -#define MAXUNAMES 20 /* maximum number of user names */ - -/* - * Unix sockets. - * We have two default sockets, one with 666 permissions, - * and one for privileged programs. - */ -struct funix { - int s; - const char *name; - mode_t mode; - STAILQ_ENTRY(funix) next; -}; -struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, - { NULL } }; -struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, - { &funix_secure } }; - -STAILQ_HEAD(, funix) funixes = { &funix_default, - &(funix_secure.next.stqe_next) }; - -/* - * 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 { - struct filed *f_next; /* next in linked list */ - short f_type; /* entry type, see below */ - short f_file; /* file descriptor */ - time_t f_time; /* time this was last written */ - char *f_host; /* host from which to recd. */ - u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ - u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ -#define PRI_LT 0x1 -#define PRI_EQ 0x2 -#define PRI_GT 0x4 - char *f_program; /* program this applies to */ - union { - char f_uname[MAXUNAMES][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; - char f_prevline[MAXSVLINE]; /* last message logged */ - char f_lasttime[16]; /* time of last occurrence */ - char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ - int f_prevpri; /* pri of f_prevline */ - int f_prevlen; /* length of f_prevline */ - int f_prevcount; /* repetition cnt of prevline */ - 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. - */ - -TAILQ_HEAD(stailhead, deadq_entry) deadq_head; -struct stailhead *deadq_headp; - -struct deadq_entry { - pid_t dq_pid; - int dq_timeout; - TAILQ_ENTRY(deadq_entry) dq_entries; -}; - -/* - * The timeout to apply to processes waiting on the dead queue. Unit - * of measure is `mark intervals', i.e. 20 minutes by default. - * Processes on the dead queue will be terminated after that time. - */ - -#define DQ_TIMO_INIT 2 - -typedef struct deadq_entry *dq_t; - - -/* - * Struct to hold records of network addresses that are allowed to log - * to us. - */ -struct allowedpeer { - int isnumeric; - u_short port; - union { - struct { - struct 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 -}; - - -/* - * Intervals at which we flush out "message repeated" messages, - * in seconds after previous message is logged. After each flush, - * we move to the next interval until we reach the largest. - */ -int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ -#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) -#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) -#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ - (f)->f_repeatcount = MAXREPEAT; \ - } - -/* values for f_type */ -#define F_UNUSED 0 /* unused entry */ -#define F_FILE 1 /* regular file */ -#define F_TTY 2 /* terminal */ -#define F_CONSOLE 3 /* console terminal */ -#define F_FORW 4 /* remote machine */ -#define F_USERS 5 /* list of users */ -#define F_WALL 6 /* everyone logged on */ -#define F_PIPE 7 /* pipe to program */ - -const char *TypeNames[8] = { - "UNUSED", "FILE", "TTY", "CONSOLE", - "FORW", "USERS", "WALL", "PIPE" -}; - -static struct filed *Files; /* Log files that we write to */ -static struct filed consfile; /* Console */ - -static int Debug; /* debug flag */ -static int resolve = 1; /* resolve hostname */ -static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ -static const char *LocalDomain; /* our local domain name */ -static int *finet; /* Internet datagram socket */ -static int fklog = -1; /* /dev/klog */ -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 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 */ - -struct allowedpeer *AllowedPeers; /* List of allowed peers */ -static int NumAllowed; /* Number of entries in AllowedPeers */ -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; - -volatile sig_atomic_t MarkSet, WantDie; - -static int allowaddr(char *); -static void cfline(const char *, struct filed *, - const char *, const char *); -static const char *cvthname(struct sockaddr *); -static void deadq_enter(pid_t, const char *); -static int deadq_remove(pid_t); -static int decode(const char *, CODE *); -static void die(int); -static void dodie(int); -static void dofsync(void); -static void domark(int); -static void fprintlog(struct filed *, int, const char *); -static int *socksetup(int, 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 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 readklog(void); -static void reapchild(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, int, int); -static void timedout(int); -static void double_rbuf(int); - -int -main(int argc, char *argv[]) -{ - int ch, i, fdsrmax = 0, l; - struct sockaddr_un sunx, fromunix; - struct sockaddr_storage frominet; - fd_set *fdsr = NULL; - char line[MAXLINE + 1]; - char *bindhostname; - const char *hname; - struct timeval tv, *tvp; - struct sigaction sact; - struct funix *fx, *fx1; - sigset_t mask; - pid_t ppid = 1, spid; - socklen_t len; - - if (madvise(NULL, 0, MADV_PROTECT) != 0) - dprintf("madvise() failed: %s\n", strerror(errno)); - - bindhostname = NULL; - while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv")) - != -1) - switch (ch) { - case '4': - family = PF_INET; - break; -#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': - bindhostname = 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 'k': /* keep remote kern fac */ - KeepKernFac = 1; - break; - case 'l': - { - long perml; - mode_t mode; - char *name, *ep; - - if (optarg[0] == '/') { - mode = DEFFILEMODE; - 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 /* doesn't begin with '/', and no ':' */ - errx(1, "can't parse path %s", optarg); - - if (strlen(name) >= sizeof(sunx.sun_path)) - errx(1, "%s path too long, exiting", name); - if ((fx = malloc(sizeof(struct funix))) == NULL) - errx(1, "malloc failed"); - fx->s = -1; - fx->name = name; - fx->mode = mode; - STAILQ_INSERT_TAIL(&funixes, fx, next); - break; - } - case 'm': /* mark interval */ - MarkInterval = atoi(optarg) * 60; - break; - case 'n': - resolve = 0; - break; - case 'o': - use_bootfile = 1; - break; - case 'p': /* path */ - if (strlen(optarg) >= sizeof(sunx.sun_path)) - errx(1, "%s path too long, exiting", optarg); - funix_default.name = optarg; - break; - case 'P': /* path for alt. PID */ - PidFile = optarg; - break; - case 's': /* no network mode */ - SecureMode++; - break; - case 'S': /* path for privileged originator */ - if (strlen(optarg) >= sizeof(sunx.sun_path)) - errx(1, "%s path too long, exiting", optarg); - funix_secure.name = optarg; - 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(); - - 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 (!Debug) { - ppid = waitdaemon(0, 0, 30); - if (ppid < 0) { - warn("could not become daemon"); - pidfile_remove(pfh); - exit(1); - } - } else { - setlinebuf(stdout); - } - - if (NumAllowed) - endservent(); - - consfile.f_type = F_CONSOLE; - (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, - sizeof(consfile.f_un.f_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); - /* - * We don't want the SIGCHLD and SIGHUP handlers to interfere - * with each other; they are likely candidates for being called - * simultaneously (SIGHUP closes pipe descriptor, process dies, - * SIGCHLD happens). - */ - sigemptyset(&mask); - sigaddset(&mask, SIGHUP); - sact.sa_handler = reapchild; - sact.sa_mask = mask; - sact.sa_flags = SA_RESTART; - (void)sigaction(SIGCHLD, &sact, NULL); - (void)signal(SIGALRM, domark); - (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ - (void)alarm(TIMERINTVL); - - TAILQ_INIT(&deadq_head); - -#ifndef SUN_LEN -#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) -#endif - STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { - (void)unlink(fx->name); - memset(&sunx, 0, sizeof(sunx)); - sunx.sun_family = AF_LOCAL; - (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); - fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); - if (fx->s < 0 || - bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || - chmod(fx->name, fx->mode) < 0) { - (void)snprintf(line, sizeof line, - "cannot create %s", fx->name); - logerror(line); - dprintf("cannot create %s (%d)\n", fx->name, errno); - if (fx == &funix_default || fx == &funix_secure) - die(0); - else { - STAILQ_REMOVE(&funixes, fx, funix, next); - continue; - } - double_rbuf(fx->s); - } - } - if (SecureMode <= 1) - finet = socksetup(family, bindhostname); - - if (finet) { - if (SecureMode) { - for (i = 0; i < *finet; i++) { - if (shutdown(finet[i+1], SHUT_RD) < 0) { - logerror("shutdown"); - if (!Debug) - die(0); - } - } - } else { - dprintf("listening on inet and/or inet6 socket\n"); - } - dprintf("sending on inet and/or inet6 socket\n"); - } - - if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) - if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) - fklog = -1; - if (fklog < 0) - dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); - - /* tuck my process id away */ - pidfile_write(pfh); - - dprintf("off & running....\n"); - - init(0); - /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ - sigemptyset(&mask); - sigaddset(&mask, SIGCHLD); - sact.sa_handler = init; - sact.sa_mask = mask; - sact.sa_flags = SA_RESTART; - (void)sigaction(SIGHUP, &sact, NULL); - - tvp = &tv; - tv.tv_sec = tv.tv_usec = 0; - - if (fklog != -1 && fklog > fdsrmax) - fdsrmax = fklog; - if (finet && !SecureMode) { - for (i = 0; i < *finet; i++) { - if (finet[i+1] != -1 && finet[i+1] > fdsrmax) - fdsrmax = finet[i+1]; - } - } - STAILQ_FOREACH(fx, &funixes, next) - if (fx->s > fdsrmax) - fdsrmax = fx->s; - - fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), - sizeof(fd_mask)); - if (fdsr == NULL) - errx(1, "calloc fd_set"); - - for (;;) { - if (MarkSet) - markit(); - if (WantDie) - die(WantDie); - - bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * - sizeof(fd_mask)); - - if (fklog != -1) - FD_SET(fklog, fdsr); - if (finet && !SecureMode) { - for (i = 0; i < *finet; i++) { - if (finet[i+1] != -1) - FD_SET(finet[i+1], fdsr); - } - } - STAILQ_FOREACH(fx, &funixes, next) - FD_SET(fx->s, 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; - } - if (fklog != -1 && FD_ISSET(fklog, fdsr)) - readklog(); - if (finet && !SecureMode) { - for (i = 0; i < *finet; i++) { - if (FD_ISSET(finet[i+1], fdsr)) { - len = sizeof(frominet); - l = recvfrom(finet[i+1], line, MAXLINE, - 0, (struct sockaddr *)&frominet, - &len); - if (l > 0) { - line[l] = '\0'; - hname = cvthname((struct sockaddr *)&frominet); - unmapped((struct sockaddr *)&frominet); - if (validate((struct sockaddr *)&frominet, hname)) - printline(hname, line, RemoteAddDate ? ADDDATE : 0); - } else if (l < 0 && errno != EINTR) - logerror("recvfrom inet"); - } - } - } - STAILQ_FOREACH(fx, &funixes, next) { - if (FD_ISSET(fx->s, fdsr)) { - len = sizeof(fromunix); - l = recvfrom(fx->s, line, MAXLINE, 0, - (struct sockaddr *)&fromunix, &len); - if (l > 0) { - line[l] = '\0'; - printline(LocalHostName, line, 0); - } else if (l < 0 && errno != EINTR) - logerror("recvfrom unix"); - } - } - } - if (fdsr) - free(fdsr); -} - -static void -unmapped(struct sockaddr *sa) -{ - struct sockaddr_in6 *sin6; - struct sockaddr_in sin4; - - if (sa->sa_family != AF_INET6) - return; - if (sa->sa_len != sizeof(struct sockaddr_in6) || - sizeof(sin4) > sa->sa_len) - return; - sin6 = (struct sockaddr_in6 *)sa; - if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) - return; - - memset(&sin4, 0, sizeof(sin4)); - sin4.sin_family = AF_INET; - sin4.sin_len = sizeof(struct sockaddr_in); - memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], - sizeof(sin4.sin_addr)); - sin4.sin_port = sin6->sin6_port; - - memcpy(sa, &sin4, sin4.sin_len); -} - -static void -usage(void) -{ - - fprintf(stderr, "%s\n%s\n%s\n%s\n", - "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", - " [-b bind_address] [-f config_file]", - " [-l [mode:]path] [-m mark_interval]", - " [-P pid_file] [-p log_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 void -readklog(void) -{ - char *p, *q, line[MAXLINE + 1]; - int len, i; - - len = 0; - for (;;) { - i = read(fklog, line + len, MAXLINE - 1 - len); - if (i > 0) { - line[i + len] = '\0'; - } else { - if (i < 0 && errno != EINTR && errno != EAGAIN) { - logerror("klog"); - fklog = -1; - } - break; - } - - for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { - *q = '\0'; - printsys(p); - } - len = strlen(p); - if (len >= MAXLINE - 1) { - printsys(p); - len = 0; - } - if (len > 0) - memmove(line, p, len + 1); - } - if (len > 0) - printsys(line); -} - -/* - * Take a raw input line from /dev/klog, format similar to syslog(). - */ -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, omask, 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); - - omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); - - /* - * Check to see if msg looks non-standard. - */ - msglen = strlen(msg); - if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || - msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') - flags |= ADDDATE; - - (void)time(&now); - if (flags & ADDDATE) { - timestamp = ctime(&now) + 4; - } else { - timestamp = msg; - msg += 16; - msglen -= 16; - } - - /* skip leading blanks */ - while (isspace(*msg)) { - msg++; - msglen--; - } - - /* extract facility and priority level */ - if (flags & MARK) - fac = LOG_NFACILITIES; - else - fac = LOG_FAC(pri); - - /* Check maximum facility number. */ - if (fac > LOG_NFACILITIES) { - (void)sigsetmask(omask); - 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); - (void)close(f->f_file); - } - (void)sigsetmask(omask); - return; - } - for (f = Files; f; f = f->f_next) { - /* skip messages that are incorrect priority */ - if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) - ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) - ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) - ) - || f->f_pmask[fac] == INTERNAL_NOPRI) - continue; - - /* skip messages with the incorrect hostname */ - if (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 && - f->f_prevline && !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); - } - } - } - (void)sigsetmask(omask); -} - -static void -dofsync(void) -{ - struct filed *f; - - for (f = Files; f; f = f->f_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 iovec *v; - struct addrinfo *r; - int i, l, lsent = 0; - char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; - char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; - const char *msgret; - - v = iov; - if (f->f_type == F_WALL) { - v->iov_base = greetings; - /* 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. - */ - v->iov_len = snprintf(greetings, sizeof greetings, - "\r\n\7Message from syslogd@%s at %.24s ...\r\n", - f->f_prevhost, f->f_lasttime); - if (v->iov_len > 0) - v++; - v->iov_base = nul; - v->iov_len = 0; - v++; - } else { - v->iov_base = f->f_lasttime; - v->iov_len = strlen(f->f_lasttime); - v++; - v->iov_base = space; - v->iov_len = 1; - v++; - } - - if (LogFacPri) { - static char fp_buf[30]; /* Hollow laugh */ - int fac = f->f_prevpri & LOG_FACMASK; - int pri = LOG_PRI(f->f_prevpri); - 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) { - CODE *c; - - for (c = facilitynames; c->c_name; c++) { - if (c->c_val == fac) { - f_s = c->c_name; - break; - } - } - for (c = prioritynames; c->c_name; c++) { - if (c->c_val == pri) { - p_s = c->c_name; - break; - } - } - } - if (!f_s) { - snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); - f_s = f_n; - } - if (!p_s) { - snprintf(p_n, sizeof p_n, "%d", pri); - p_s = p_n; - } - snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); - v->iov_base = fp_buf; - v->iov_len = strlen(fp_buf); - } else { - v->iov_base = nul; - v->iov_len = 0; - } - v++; - - v->iov_base = f->f_prevhost; - v->iov_len = strlen(v->iov_base); - v++; - v->iov_base = space; - v->iov_len = 1; - v++; - - if (msg) { - wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ - if (wmsg == NULL) { - logerror("strdup"); - exit(1); - } - v->iov_base = wmsg; - v->iov_len = strlen(msg); - } else if (f->f_prevcount > 1) { - v->iov_base = repbuf; - v->iov_len = snprintf(repbuf, sizeof repbuf, - "last message repeated %d times", f->f_prevcount); - } else if (f->f_prevline) { - v->iov_base = f->f_prevline; - v->iov_len = f->f_prevlen; - } else { - return; - } - v++; - - dprintf("Logging to %s", TypeNames[f->f_type]); - f->f_time = now; - - switch (f->f_type) { - int port; - case F_UNUSED: - dprintf("\n"); - break; - - case F_FORW: - port = (int)ntohs(((struct sockaddr_in *) - (f->f_un.f_forw.f_addr->ai_addr))->sin_port); - if (port != 514) { - dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); - } else { - dprintf(" %s\n", f->f_un.f_forw.f_hname); - } - /* check for local vs remote messages */ - if (strcasecmp(f->f_prevhost, LocalHostName)) - l = snprintf(line, sizeof line - 1, - "<%d>%.15s Forwarded from %s: %s", - f->f_prevpri, (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; - - if (finet) { - for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { - for (i = 0; i < *finet; i++) { -#if 0 - /* - * should we check AF first, or just - * trial and error? FWD - */ - if (r->ai_family == - address_family_of(finet[i+1])) -#endif - lsent = sendto(finet[i+1], 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 EHOSTUNREACH: - case EHOSTDOWN: - break; - /* case EBADF: */ - /* case EACCES: */ - /* case ENOTSOCK: */ - /* case EFAULT: */ - /* case EMSGSIZE: */ - /* case EAGAIN: */ - /* case ENOBUFS: */ - /* case ECONNREFUSED: */ - default: - dprintf("removing entry\n"); - f->f_type = F_UNUSED; - break; - } - } - } - break; - - case F_FILE: - dprintf(" %s\n", f->f_un.f_fname); - v->iov_base = lf; - v->iov_len = 1; - if (writev(f->f_file, iov, IOV_SIZE) < 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; - (void)close(f->f_file); - f->f_type = F_UNUSED; - errno = e; - logerror(f->f_un.f_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->f_un.f_pipe.f_pname); - v->iov_base = lf; - v->iov_len = 1; - if (f->f_un.f_pipe.f_pid == 0) { - if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, - &f->f_un.f_pipe.f_pid)) < 0) { - f->f_type = F_UNUSED; - logerror(f->f_un.f_pipe.f_pname); - break; - } - } - if (writev(f->f_file, iov, IOV_SIZE) < 0) { - int e = errno; - (void)close(f->f_file); - if (f->f_un.f_pipe.f_pid > 0) - deadq_enter(f->f_un.f_pipe.f_pid, - f->f_un.f_pipe.f_pname); - f->f_un.f_pipe.f_pid = 0; - errno = e; - logerror(f->f_un.f_pipe.f_pname); - } - break; - - case F_CONSOLE: - if (flags & IGN_CONS) { - dprintf(" (ignored)\n"); - break; - } - /* FALLTHROUGH */ - - case F_TTY: - dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); - v->iov_base = crlf; - v->iov_len = 2; - - errno = 0; /* ttymsg() only sometimes returns an errno */ - if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { - f->f_type = F_UNUSED; - logerror(msgret); - } - break; - - case F_USERS: - case F_WALL: - dprintf("\n"); - v->iov_base = crlf; - v->iov_len = 2; - wallmsg(f, iov, IOV_SIZE); - 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->f_un.f_uname[i][0]) - break; - if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { - if ((p = ttymsg(iov, iovlen, ut->ut_line, - TTYMSGTIME)) != NULL) { - errno = 0; /* already in msg */ - logerror(p); - } - break; - } - } - } - endutxent(); - reenter = 0; -} - -static void -reapchild(int signo __unused) -{ - int status; - pid_t pid; - struct filed *f; - - while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { - if (!Initialized) - /* Don't tell while we are initting. */ - continue; - - /* First, look if it's a process from the dead queue. */ - if (deadq_remove(pid)) - goto oncemore; - - /* Now, look in list of active processes. */ - for (f = Files; f; f = f->f_next) - if (f->f_type == F_PIPE && - f->f_un.f_pipe.f_pid == pid) { - (void)close(f->f_file); - f->f_un.f_pipe.f_pid = 0; - log_deadchild(pid, status, - f->f_un.f_pipe.f_pname); - break; - } - oncemore: - continue; - } -} - -/* - * Return a printable representation of a host address. - */ -static const char * -cvthname(struct sockaddr *f) -{ - int error, hl; - sigset_t omask, nmask; - static char hname[NI_MAXHOST], ip[NI_MAXHOST]; - - error = getnameinfo((struct sockaddr *)f, - ((struct sockaddr *)f)->sa_len, - ip, sizeof ip, NULL, 0, NI_NUMERICHOST); - dprintf("cvthname(%s)\n", ip); - - if (error) { - dprintf("Malformed from address %s\n", gai_strerror(error)); - return ("???"); - } - if (!resolve) - return (ip); - - sigemptyset(&nmask); - sigaddset(&nmask, SIGHUP); - sigprocmask(SIG_BLOCK, &nmask, &omask); - error = getnameinfo((struct sockaddr *)f, - ((struct sockaddr *)f)->sa_len, - hname, sizeof hname, NULL, 0, NI_NAMEREQD); - sigprocmask(SIG_SETMASK, &omask, NULL); - 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 funix *fx; - int was_initialized; - char buf[100]; - - was_initialized = Initialized; - Initialized = 0; /* Don't log SIGCHLDs. */ - for (f = Files; f != NULL; f = f->f_next) { - /* flush any pending output */ - if (f->f_prevcount) - fprintlog(f, 0, (char *)NULL); - if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { - (void)close(f->f_file); - f->f_un.f_pipe.f_pid = 0; - } - } - Initialized = was_initialized; - 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(fx, &funixes, next) - (void)unlink(fx->name); - pidfile_remove(pfh); - - exit(1); -} - -/* - * INIT -- Initialize syslogd from configuration table - */ -static void -init(int signo) -{ - int i; - FILE *cf; - struct filed *f, *next, **nextp; - char *p; - char cline[LINE_MAX]; - char prog[NAME_MAX+1]; - char host[MAXHOSTNAMELEN]; - char oldLocalHostName[MAXHOSTNAMELEN]; - char hostMsg[2*MAXHOSTNAMELEN+40]; - char bootfileMsg[LINE_MAX]; - - dprintf("init\n"); - - /* - * 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 = ""; - } - - /* - * Close all open log files. - */ - Initialized = 0; - for (f = Files; f != NULL; f = next) { - /* flush any pending output */ - if (f->f_prevcount) - fprintlog(f, 0, (char *)NULL); - - switch (f->f_type) { - case F_FILE: - case F_FORW: - case F_CONSOLE: - case F_TTY: - (void)close(f->f_file); - break; - case F_PIPE: - if (f->f_un.f_pipe.f_pid > 0) { - (void)close(f->f_file); - deadq_enter(f->f_un.f_pipe.f_pid, - f->f_un.f_pipe.f_pname); - } - f->f_un.f_pipe.f_pid = 0; - break; - } - next = f->f_next; - if (f->f_program) free(f->f_program); - if (f->f_host) free(f->f_host); - free((char *)f); - } - Files = NULL; - nextp = &Files; - - /* open the configuration file */ - if ((cf = fopen(ConfFile, "r")) == NULL) { - dprintf("cannot open %s\n", ConfFile); - *nextp = (struct filed *)calloc(1, sizeof(*f)); - if (*nextp == NULL) { - logerror("calloc"); - exit(1); - } - cfline("*.ERR\t/dev/console", *nextp, "*", "*"); - (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); - if ((*nextp)->f_next == NULL) { - logerror("calloc"); - exit(1); - } - cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); - Initialized = 1; - return; - } - - /* - * Foreach line in the conf table, open that file. - */ - f = NULL; - (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 (*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 < NAME_MAX; 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 = (struct filed *)calloc(1, sizeof(*f)); - if (f == NULL) { - logerror("calloc"); - exit(1); - } - *nextp = f; - nextp = &f->f_next; - cfline(cline, f, prog, host); - } - - /* close the configuration file */ - (void)fclose(cf); - - Initialized = 1; - - if (Debug) { - int port; - for (f = Files; f; f = f->f_next) { - for (i = 0; i <= LOG_NFACILITIES; i++) - if (f->f_pmask[i] == INTERNAL_NOPRI) - printf("X "); - else - printf("%d ", f->f_pmask[i]); - printf("%s: ", TypeNames[f->f_type]); - switch (f->f_type) { - case F_FILE: - printf("%s", f->f_un.f_fname); - break; - - case F_CONSOLE: - case F_TTY: - printf("%s%s", _PATH_DEV, f->f_un.f_fname); - break; - - case F_FORW: - port = (int)ntohs(((struct sockaddr_in *) - (f->f_un.f_forw.f_addr->ai_addr))->sin_port); - if (port != 514) { - printf("%s:%d", - f->f_un.f_forw.f_hname, port); - } else { - printf("%s", f->f_un.f_forw.f_hname); - } - break; - - case F_PIPE: - printf("%s", f->f_un.f_pipe.f_pname); - break; - - case F_USERS: - for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) - printf("%s, ", f->f_un.f_uname[i]); - break; - } - if (f->f_program) - printf(" (%s)", f->f_program); - printf("\n"); - } - } - - logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); - dprintf("syslogd: restarted\n"); - /* - * 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 void -cfline(const char *line, struct filed *f, const char *prog, const char *host) -{ - 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); - - errno = 0; /* keep strerror() stuff out of logerror messages */ - - /* clear out file entry */ - memset(f, 0, sizeof(*f)); - for (i = 0; i <= LOG_NFACILITIES; i++) - f->f_pmask[i] = INTERNAL_NOPRI; - - /* save hostname if any */ - if (host && *host == '*') - host = NULL; - if (host) { - 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) { - (void)snprintf(ebuf, sizeof ebuf, - "unknown priority name \"%s\"", buf); - logerror(ebuf); - return; - } - } - 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) { - (void)snprintf(ebuf, sizeof ebuf, - "unknown facility name \"%s\"", - buf); - logerror(ebuf); - return; - } - f->f_pmask[i >> 3] = pri; - f->f_pcmp[i >> 3] = pri_cmp; - } - while (*p == ',' || *p == ' ') - p++; - } - - p = q; - } - - /* skip to action part */ - while (*p == '\t' || *p == ' ') - p++; - - if (*p == '-') { - syncfile = 0; - p++; - } else - syncfile = 1; - - switch (*p) { - case '@': - { - char *tp; - /* - * scan forward to see if there is a port defined. - * so we can't use strlcpy.. - */ - i = sizeof(f->f_un.f_forw.f_hname); - tp = f->f_un.f_forw.f_hname; - p++; - - while (*p && (*p != ':') && (i-- > 0)) { - *tp++ = *p++; - } - *tp = '\0'; - } - /* See if we copied a domain and have a port */ - if (*p == ':') - p++; - else - p = NULL; - - memset(&hints, 0, sizeof(hints)); - hints.ai_family = family; - hints.ai_socktype = SOCK_DGRAM; - error = getaddrinfo(f->f_un.f_forw.f_hname, - p ? p : "syslog", &hints, &res); - if (error) { - logerror(gai_strerror(error)); - break; - } - f->f_un.f_forw.f_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->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, - sizeof(f->f_un.f_fname)); - } else { - (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); - f->f_type = F_FILE; - } - break; - - case '|': - f->f_un.f_pipe.f_pid = 0; - (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, - sizeof(f->f_un.f_pipe.f_pname)); - f->f_type = F_PIPE; - break; - - case '*': - f->f_type = F_WALL; - break; - - default: - for (i = 0; i < MAXUNAMES && *p; i++) { - for (q = p; *q && *q != ','; ) - q++; - (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); - if ((q - p) >= MAXLOGNAME) - f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; - else - f->f_un.f_uname[i][q - p] = '\0'; - while (*q == ',' || *q == ' ') - q++; - p = q; - } - f->f_type = F_USERS; - break; - } -} - - -/* - * Decode a symbolic name to a numeric value - */ -static int -decode(const char *name, CODE *codetab) -{ - CODE *c; - char *p, buf[40]; - - if (isdigit(*name)) - return (atoi(name)); - - for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { - if (isupper(*name)) - *p = tolower(*name); - else - *p = *name; - } - *p = '\0'; - for (c = codetab; c->c_name; c++) - if (!strcmp(buf, c->c_name)) - return (c->c_val); - - return (-1); -} - -static void -markit(void) -{ - struct filed *f; - dq_t q, next; - - now = time((time_t *)NULL); - MarkSeq += TIMERINTVL; - if (MarkSeq >= MarkInterval) { - logmsg(LOG_INFO, "-- MARK --", - LocalHostName, ADDDATE|MARK); - MarkSeq = 0; - } - - for (f = Files; f; f = f->f_next) { - if (f->f_prevcount && now >= REPEATTIME(f)) { - dprintf("flush %s: repeated %d times, %d sec.\n", - TypeNames[f->f_type], f->f_prevcount, - repeatinterval[f->f_repeatcount]); - fprintlog(f, 0, (char *)NULL); - BACKOFF(f); - } - } - - /* Walk the dead queue, and see if we should signal somebody. */ - for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { - next = TAILQ_NEXT(q, dq_entries); - - switch (q->dq_timeout) { - case 0: - /* Already signalled once, try harder now. */ - if (kill(q->dq_pid, SIGKILL) != 0) - (void)deadq_remove(q->dq_pid); - break; - - case 1: - /* - * Timed out on dead queue, send terminate - * signal. Note that we leave the removal - * from the dead queue to reapchild(), which - * will also log the event (unless the process - * didn't even really exist, in case we simply - * drop it from the dead queue). - */ - if (kill(q->dq_pid, SIGTERM) != 0) - (void)deadq_remove(q->dq_pid); - /* FALLTHROUGH */ - - default: - q->dq_timeout--; - } - } - MarkSet = 0; - (void)alarm(TIMERINTVL); -} - -/* - * fork off and become a daemon, but wait for the child to come online - * before returing to the parent, or we get disk thrashing at boot etc. - * Set a timer so we don't hang forever if it wedges. - */ -static int -waitdaemon(int nochdir, int noclose, 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); - - if (!nochdir) - (void)chdir("/"); - - if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { - (void)dup2(fd, STDIN_FILENO); - (void)dup2(fd, STDOUT_FILENO); - (void)dup2(fd, STDERR_FILENO); - if (fd > 2) - (void)close (fd); - } - return (getppid()); -} - -/* - * We get a SIGALRM from the child when it's running and finished doing it's - * fsync()'s or O_SYNC writes for all the boot messages. - * - * We also get a signal from the kernel if the timer expires, so check to - * see what happened. - */ -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) -{ - char *cp1, *cp2; - struct allowedpeer ap; - struct servent *se; - int masklen = -1; - struct addrinfo hints, *res; - struct in_addr *addrp, *maskp; -#ifdef INET6 - int i; - u_int32_t *addr6p, *mask6p; -#endif - char ip[NI_MAXHOST]; - -#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); - if (*cp2 != '\0') - return (-1); /* port not numeric */ - } - } 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) - return (-1); - } -#ifdef INET6 - if (*s == '[') { - cp2 = s + strlen(s) - 1; - if (*cp2 == ']') { - ++s; - *cp2 = '\0'; - } else { - cp2 = NULL; - } - } else { - cp2 = NULL; - } -#endif - memset(&hints, 0, sizeof(hints)); - hints.ai_family = PF_UNSPEC; - hints.ai_socktype = SOCK_DGRAM; - hints.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); - memset(&ap.a_mask, 0, sizeof(ap.a_mask)); - ap.a_mask.ss_family = res->ai_family; - if (res->ai_family == AF_INET) { - ap.a_mask.ss_len = sizeof(struct sockaddr_in); - maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; - addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; - if (masklen < 0) { - /* use default netmask */ - if (IN_CLASSA(ntohl(addrp->s_addr))) - maskp->s_addr = htonl(IN_CLASSA_NET); - else if (IN_CLASSB(ntohl(addrp->s_addr))) - maskp->s_addr = htonl(IN_CLASSB_NET); - else - maskp->s_addr = htonl(IN_CLASSC_NET); - } else if (masklen <= 32) { - /* convert masklen to netmask */ - if (masklen == 0) - maskp->s_addr = 0; - else - maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); - } else { - freeaddrinfo(res); - return (-1); - } - /* Lose any host bits in the network number. */ - addrp->s_addr &= maskp->s_addr; - } -#ifdef INET6 - else if (res->ai_family == AF_INET6 && masklen <= 128) { - ap.a_mask.ss_len = sizeof(struct sockaddr_in6); - if (masklen < 0) - masklen = 128; - mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; - /* convert masklen to netmask */ - while (masklen > 0) { - if (masklen < 32) { - *mask6p = htonl(~(0xffffffff >> masklen)); - break; - } - *mask6p++ = 0xffffffff; - masklen -= 32; - } - /* Lose any host bits in the network number. */ - mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; - addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; - for (i = 0; i < 4; i++) - addr6p[i] &= mask6p[i]; - } -#endif - else { - freeaddrinfo(res); - return (-1); - } - 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 - } - - if (Debug) { - printf("allowaddr: rule %d: ", NumAllowed); - if (ap.isnumeric) { - printf("numeric, "); - getnameinfo((struct sockaddr *)&ap.a_addr, - ((struct sockaddr *)&ap.a_addr)->sa_len, - ip, sizeof ip, NULL, 0, NI_NUMERICHOST); - printf("addr = %s, ", ip); - getnameinfo((struct sockaddr *)&ap.a_mask, - ((struct sockaddr *)&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); - } - - if ((AllowedPeers = realloc(AllowedPeers, - ++NumAllowed * sizeof(struct allowedpeer))) - == NULL) { - logerror("realloc"); - exit(1); - } - memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); - return (0); -} - -/* - * Validate that the remote peer has permission to log to us. - */ -static int -validate(struct sockaddr *sa, const char *hname) -{ - int i; - size_t l1, l2; - char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; - struct allowedpeer *ap; - struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; -#ifdef INET6 - int j, reject; - struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; -#endif - struct addrinfo hints, *res; - u_short sport; - - if (NumAllowed == 0) - /* traditional behaviour, allow everything */ - return (1); - - (void)strlcpy(name, hname, sizeof(name)); - memset(&hints, 0, sizeof(hints)); - hints.ai_family = PF_UNSPEC; - hints.ai_socktype = SOCK_DGRAM; - hints.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 */ - for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { - 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; - } - if (ap->a_addr.ss_family == AF_INET) { - sin4 = (struct sockaddr_in *)sa; - a4p = (struct sockaddr_in *)&ap->a_addr; - m4p = (struct sockaddr_in *)&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; - } - } -#ifdef INET6 - else if (ap->a_addr.ss_family == AF_INET6) { - sin6 = (struct sockaddr_in6 *)sa; - a6p = (struct sockaddr_in6 *)&ap->a_addr; - m6p = (struct sockaddr_in6 *)&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; - } - reject = 0; - for (j = 0; j < 16; j += 4) { - if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) - != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { - ++reject; - break; - } - } - if (reject) { - dprintf("rejected in rule %d due to IP mismatch.\n", i); - continue; - } - } -#endif - else - continue; - } else { - cp = ap->a_name; - l1 = strlen(name); - if (*cp == '*') { - /* allow wildmatch */ - cp++; - l2 = strlen(cp); - if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { - dprintf("rejected in rule %d due to name mismatch.\n", i); - continue; - } - } else { - /* exact match */ - l2 = strlen(cp); - if (l2 != l1 || memcmp(cp, name, l1) != 0) { - dprintf("rejected in rule %d due to name mismatch.\n", i); - continue; - } - } - } - dprintf("accepted in rule %d.\n", i); - return (1); /* hooray! */ - } - return (0); -} - -/* - * Fairly similar to popen(3), but returns an open descriptor, as - * opposed to a FILE *. - */ -static int -p_open(const char *prog, pid_t *rpid) -{ - int pfd[2], nulldesc, i; - pid_t pid; - sigset_t omask, mask; - char *argv[4]; /* sh -c cmd NULL */ - char errmsg[200]; - - if (pipe(pfd) == -1) - return (-1); - if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) - /* we are royally screwed anyway */ - return (-1); - - sigemptyset(&mask); - sigaddset(&mask, SIGALRM); - sigaddset(&mask, SIGHUP); - sigprocmask(SIG_BLOCK, &mask, &omask); - switch ((pid = fork())) { - case -1: - sigprocmask(SIG_SETMASK, &omask, 0); - close(nulldesc); - return (-1); - - case 0: - argv[0] = 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); - (void)setsid(); /* Avoid catching SIGHUPs. */ - - /* - * Throw away pending signals, and reset signal - * behaviour to standard values. - */ - signal(SIGALRM, SIG_IGN); - signal(SIGHUP, SIG_IGN); - sigprocmask(SIG_SETMASK, &omask, 0); - signal(SIGPIPE, SIG_DFL); - signal(SIGQUIT, SIG_DFL); - signal(SIGALRM, SIG_DFL); - signal(SIGHUP, SIG_DFL); - - dup2(pfd[0], STDIN_FILENO); - dup2(nulldesc, STDOUT_FILENO); - dup2(nulldesc, STDERR_FILENO); - for (i = getdtablesize(); i > 2; i--) - (void)close(i); - - (void)execvp(_PATH_BSHELL, argv); - _exit(255); - } - - sigprocmask(SIG_SETMASK, &omask, 0); - close(nulldesc); - close(pfd[0]); - /* - * Avoid blocking on a hung pipe. With O_NONBLOCK, we are - * supposed to get an EWOULDBLOCK on writev(2), which is - * caught by the logic above anyway, which will in turn close - * the pipe, and fork a new logging subprocess if necessary. - * The stale subprocess will be killed some time later unless - * it terminated itself due to closing its input pipe (so we - * get rid of really dead puppies). - */ - if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { - /* This is bad. */ - (void)snprintf(errmsg, sizeof errmsg, - "Warning: cannot change pipe to PID %d to " - "non-blocking behaviour.", - (int)pid); - logerror(errmsg); - } - *rpid = pid; - return (pfd[1]); -} - -static void -deadq_enter(pid_t pid, const char *name) -{ - dq_t p; - int status; - - /* - * Be paranoid, if we can't signal the process, don't enter it - * into the dead queue (perhaps it's already dead). If possible, - * we try to fetch and log the child's status. - */ - if (kill(pid, 0) != 0) { - if (waitpid(pid, &status, WNOHANG) > 0) - log_deadchild(pid, status, name); - return; - } - - p = malloc(sizeof(struct deadq_entry)); - if (p == NULL) { - logerror("malloc"); - exit(1); - } - - p->dq_pid = pid; - p->dq_timeout = DQ_TIMO_INIT; - TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); -} - -static int -deadq_remove(pid_t pid) -{ - dq_t q; - - TAILQ_FOREACH(q, &deadq_head, dq_entries) { - if (q->dq_pid == pid) { - TAILQ_REMOVE(&deadq_head, q, dq_entries); - free(q); - return (1); - } - } - - return (0); -} - -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(int af, char *bindhostname) -{ - struct addrinfo hints, *res, *r; - const char *bindservice; - char *cp; - int error, maxs, *s, *socks; - - /* - * 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. - */ - bindservice = "syslog"; - if (bindhostname != NULL) { -#ifdef INET6 - if (*bindhostname == '[' && - (cp = strchr(bindhostname + 1, ']')) != NULL) { - ++bindhostname; - *cp = '\0'; - if (cp[1] == ':' && cp[2] != '\0') - bindservice = cp + 2; - } else { -#endif - cp = strchr(bindhostname, ':'); - if (cp != NULL && strchr(cp + 1, ':') == NULL) { - *cp = '\0'; - if (cp[1] != '\0') - bindservice = cp + 1; - if (cp == bindhostname) - bindhostname = NULL; - } -#ifdef INET6 - } -#endif - } - - memset(&hints, 0, sizeof(hints)); - hints.ai_flags = AI_PASSIVE; - hints.ai_family = af; - hints.ai_socktype = SOCK_DGRAM; - error = getaddrinfo(bindhostname, bindservice, &hints, &res); - if (error) { - logerror(gai_strerror(error)); - errno = 0; - die(0); - } - - /* Count max number of sockets we may open */ - for (maxs = 0, r = res; r; r = r->ai_next, maxs++); - socks = malloc((maxs+1) * sizeof(int)); - if (socks == NULL) { - logerror("couldn't allocate memory for sockets"); - die(0); - } - - *socks = 0; /* num of sockets counter at start of array */ - s = socks + 1; - for (r = res; r; r = r->ai_next) { - int on = 1; - *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); - if (*s < 0) { - logerror("socket"); - continue; - } - if (r->ai_family == AF_INET6) { - if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, - (char *)&on, sizeof (on)) < 0) { - logerror("setsockopt"); - close(*s); - continue; - } - } - if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, - (char *)&on, sizeof (on)) < 0) { - logerror("setsockopt"); - close(*s); - continue; - } - if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { - close(*s); - logerror("bind"); - continue; - } - - double_rbuf(*s); - - (*socks)++; - s++; - } - - if (*socks == 0) { - free(socks); - if (Debug) - return (NULL); - else - die(0); - } - if (res) - freeaddrinfo(res); - - return (socks); -} - -static void -double_rbuf(int fd) -{ - socklen_t slen, len; - - if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { - len *= 2; - setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen); - } -} |