diff options
Diffstat (limited to 'usr.sbin/syslogd/syslogd.c')
| -rw-r--r-- | usr.sbin/syslogd/syslogd.c | 2851 |
1 files changed, 2851 insertions, 0 deletions
diff --git a/usr.sbin/syslogd/syslogd.c b/usr.sbin/syslogd/syslogd.c new file mode 100644 index 0000000..cd0f1b6 --- /dev/null +++ b/usr.sbin/syslogd/syslogd.c @@ -0,0 +1,2851 @@ +/* + * 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 */ +#define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ + +#include <sys/param.h> +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <sys/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 */ + +/* + * List of hosts for binding. + */ +static STAILQ_HEAD(, host) hqueue; +struct host { + char *name; + STAILQ_ENTRY(host) next; +}; + +/* + * 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 Foreground = 0; /* Run in foreground, instead of daemonizing */ +static int resolve = 1; /* resolve hostname */ +static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ +static const char *LocalDomain; /* our local domain name */ +static int *finet; /* Internet datagram sockets */ +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 NoBind; /* don't bind() as suggested by RFC 3164 */ +static int SecureMode; /* when true, receive only unix domain socks */ +#ifdef INET6 +static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ +#else +static int family = PF_INET; /* protocol family (IPv4 only) */ +#endif +static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ +static int send_to_all; /* send message to all IPv4/IPv6 addresses */ +static int use_bootfile; /* log entire bootfile for every kern msg */ +static int no_compress; /* don't compress messages (1=pipes, 2=all) */ +static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ + +static char bootfile[MAXLINE+1]; /* booted kernel file */ + +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 *, const CODE *); +static void die(int) __dead2; +static void dodie(int); +static void dofsync(void); +static void domark(int); +static void fprintlog(struct filed *, int, const char *); +static 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 const char *ttymsg_check(struct iovec *, int, char *, int); +static void usage(void); +static int validate(struct sockaddr *, const char *); +static void unmapped(struct sockaddr *); +static void wallmsg(struct filed *, struct iovec *, const int iovlen); +static int waitdaemon(int, int, int); +static void timedout(int); +static void increase_rcvbuf(int); + +static void +close_filed(struct filed *f) +{ + + if (f == NULL || f->f_file == -1) + return; + + (void)close(f->f_file); + f->f_file = -1; + f->f_type = F_UNUSED; +} + +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]; + const char *hname; + struct timeval tv, *tvp; + struct sigaction sact; + struct host *host; + 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)); + + STAILQ_INIT(&hqueue); + + while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop: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': + { + if ((host = malloc(sizeof(struct host))) == NULL) + err(1, "malloc failed"); + host->name = optarg; + STAILQ_INSERT_TAIL(&hqueue, host, next); + break; + } + case 'c': + no_compress++; + break; + case 'C': + logflags |= O_CREAT; + break; + case 'd': /* debug */ + Debug++; + break; + case 'f': /* configuration file */ + ConfFile = optarg; + break; + case 'F': /* run in foreground instead of daemon */ + Foreground++; + break; + case 'k': /* keep remote kern fac */ + KeepKernFac = 1; + break; + case 'l': + { + 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) + err(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': + NoBind = 1; + SecureMode = 1; + 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 ((!Foreground) && (!Debug)) { + ppid = waitdaemon(0, 0, 30); + if (ppid < 0) { + warn("could not become daemon"); + pidfile_remove(pfh); + exit(1); + } + } else if (Debug) { + 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; + } + } + increase_rcvbuf(fx->s); + } + if (SecureMode <= 1) { + if (STAILQ_EMPTY(&hqueue)) + finet = socksetup(family, NULL); + STAILQ_FOREACH(host, &hqueue, next) { + int *finet0, total; + finet0 = socksetup(family, host->name); + if (finet0 && !finet) { + finet = finet0; + } else if (finet0 && finet) { + total = *finet0 + *finet + 1; + finet = realloc(finet, total * sizeof(int)); + if (finet == NULL) + err(1, "realloc failed"); + for (i = 1; i <= *finet0; i++) { + finet[(*finet)+i] = finet0[i]; + } + *finet = total - 1; + free(finet0); + } + } + } + + if (finet) { + if (SecureMode) { + for (i = 0; i < *finet; i++) { + if (shutdown(finet[i+1], SHUT_RD) < 0 && + errno != ENOTCONN) { + 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 [-468ACcdFknosTuv] [-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); + close(f->f_file); + f->f_file = -1; + } + (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 && + !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 >= sizeof greetings) + v->iov_len = sizeof greetings - 1; + 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) { + const CODE *c; + + for (c = facilitynames; c->c_name; c++) { + if (c->c_val == fac) { + f_s = c->c_name; + break; + } + } + for (c = prioritynames; c->c_name; c++) { + if (c->c_val == pri) { + p_s = c->c_name; + break; + } + } + } + if (!f_s) { + snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); + f_s = f_n; + } + if (!p_s) { + snprintf(p_n, sizeof p_n, "%d", pri); + p_s = p_n; + } + snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); + 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 { + v->iov_base = f->f_prevline; + v->iov_len = f->f_prevlen; + } + v++; + + dprintf("Logging to %s", TypeNames[f->f_type]); + f->f_time = now; + + switch (f->f_type) { + 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 ENETUNREACH: + case EHOSTUNREACH: + case EHOSTDOWN: + case EADDRNOTAVAIL: + break; + /* case EBADF: */ + /* case EACCES: */ + /* case ENOTSOCK: */ + /* case EFAULT: */ + /* case EMSGSIZE: */ + /* case EAGAIN: */ + /* case ENOBUFS: */ + /* case ECONNREFUSED: */ + default: + dprintf("removing entry: errno=%d\n", e); + f->f_type = F_UNUSED; + break; + } + } + } + break; + + case F_FILE: + dprintf(" %s\n", f->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; + close_filed(f); + 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; + close_filed(f); + 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_check(iov, iovlen, ut->ut_line, + TTYMSGTIME)) != NULL) { + errno = 0; /* already in msg */ + logerror(p); + } + break; + } + } + } + endutxent(); + reenter = 0; +} + +/* + * Wrapper routine for ttymsg() that checks the terminal for messages enabled. + */ +static const char * +ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) +{ + static char device[1024]; + static char errbuf[1024]; + struct stat sb; + + (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); + + if (stat(device, &sb) < 0) { + (void) snprintf(errbuf, sizeof(errbuf), + "%s: %s", device, strerror(errno)); + return (errbuf); + } + if ((sb.st_mode & S_IWGRP) == 0) + /* Messages disabled. */ + return (NULL); + return ttymsg(iov, iovcnt, line, tmout); +} + +static void +reapchild(int signo __unused) +{ + int status; + pid_t pid; + struct filed *f; + + while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { + 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) { + close_filed(f); + 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) { + close_filed(f); + 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[LINE_MAX]; + 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 = ""; + } + + /* + * Load / reload timezone data (in case it changed). + * + * Just calling tzset() again does not work, the timezone code + * caches the result. However, by setting the TZ variable, one + * can defeat the caching and have the timezone code really + * reload the timezone data. Respect any initial setting of + * TZ, in case the system is configured specially. + */ + dprintf("loading timezone data via tzset()\n"); + if (getenv("TZ")) { + tzset(); + } else { + setenv("TZ", ":/etc/localtime", 1); + tzset(); + unsetenv("TZ"); + } + + /* + * Close all open log files. + */ + Initialized = 0; + 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: + close_filed(f); + break; + case F_PIPE: + if (f->f_un.f_pipe.f_pid > 0) { + close_filed(f); + 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 < LINE_MAX - 1; i++) { + if (!isprint(p[i]) || isspace(p[i])) + break; + prog[i] = p[i]; + } + prog[i] = 0; + continue; + } + for (p = cline + 1; *p != '\0'; p++) { + if (*p != '#') + continue; + if (*(p - 1) == '\\') { + strcpy(p - 1, p); + p--; + continue; + } + *p = '\0'; + break; + } + for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) + cline[i] = '\0'; + f = (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) { + errno = 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) { + errno = 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; + char endkey = ':'; + /* + * 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++; + + /* + * an ipv6 address should start with a '[' in that case + * we should scan for a ']' + */ + if (*p == '[') { + p++; + endkey = ']'; + } + while (*p && (*p != endkey) && (i-- > 0)) { + *tp++ = *p++; + } + if (endkey == ']' && *p == endkey) + p++; + *tp = '\0'; + } + /* See if we copied a domain and have a port */ + if (*p == ':') + p++; + else + p = NULL; + + 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, const CODE *codetab) +{ + const CODE *c; + char *p, buf[40]; + + if (isdigit(*name)) + return (atoi(name)); + + for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { + if (isupper(*name)) + *p = tolower(*name); + else + *p = *name; + } + *p = '\0'; + for (c = codetab; c->c_name; c++) + if (!strcmp(buf, c->c_name)) + return (c->c_val); + + return (-1); +} + +static void +markit(void) +{ + struct filed *f; + 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; + 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); + closefrom(3); + + (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; + } +#ifdef INET6 + if (r->ai_family == AF_INET6) { + if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, + (char *)&on, sizeof (on)) < 0) { + logerror("setsockopt"); + close(*s); + continue; + } + } +#endif + if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, + (char *)&on, sizeof (on)) < 0) { + logerror("setsockopt"); + close(*s); + continue; + } + /* + * RFC 3164 recommends that client side message + * should come from the privileged syslogd port. + * + * If the system administrator choose not to obey + * this, we can skip the bind() step so that the + * system will choose a port for us. + */ + if (!NoBind) { + if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { + logerror("bind"); + close(*s); + continue; + } + + if (!SecureMode) + increase_rcvbuf(*s); + } + + (*socks)++; + dprintf("socksetup: new socket fd is %d\n", *s); + s++; + } + + if (*socks == 0) { + free(socks); + if (Debug) + return (NULL); + else + die(0); + } + if (res) + freeaddrinfo(res); + + return (socks); +} + +static void +increase_rcvbuf(int fd) +{ + socklen_t len, slen; + + slen = sizeof(len); + + if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { + if (len < RCVBUF_MINSIZE) { + len = RCVBUF_MINSIZE; + setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); + } + } +} |
