diff options
Diffstat (limited to 'usr.sbin/syslogd/syslogd.c')
| -rw-r--r-- | usr.sbin/syslogd/syslogd.c | 1798 |
1 files changed, 1798 insertions, 0 deletions
diff --git a/usr.sbin/syslogd/syslogd.c b/usr.sbin/syslogd/syslogd.c new file mode 100644 index 0000000..5c4636a --- /dev/null +++ b/usr.sbin/syslogd/syslogd.c @@ -0,0 +1,1798 @@ +/* + * Copyright (c) 1983, 1988, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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 +static const char rcsid[] = + "$Id: syslogd.c,v 1.36 1998/06/27 21:45:59 steve Exp $"; +#endif /* not lint */ + +/* + * syslogd -- log system messages + * + * This program implements a system log. It takes a series of lines. + * Each line may have a priority, signified as "<n>" as + * the first characters of the line. If this is + * not present, a default priority is used. + * + * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will + * cause it to reread its configuration file. + * + * Defined Constants: + * + * MAXLINE -- the maximimum line length that can be handled. + * DEFUPRI -- the default priority for user messages + * DEFSPRI -- the default priority for kernel messages + * + * Author: Eric Allman + * extensive changes by Ralph Campbell + * more extensive changes by Eric Allman (again) + * Extension to log by program name as well as facility and priority + * by Peter da Silva. + */ + +#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 /* timed out passed to ttymsg */ + +#include <sys/param.h> +#include <sys/ioctl.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 <paths.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 <regex.h> +#include <setjmp.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sysexits.h> +#include <unistd.h> +#include <utmp.h> +#include "pathnames.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 */ + +#define MAXFUNIX 20 + +int nfunix = 1; +char *funixn[MAXFUNIX] = { _PATH_LOG }; +int funix[MAXFUNIX]; + +/* + * 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. + */ + +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 */ + u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ + char *f_program; /* program this applies to */ + union { + char f_uname[MAXUNAMES][UT_NAMESIZE+1]; + struct { + char f_hname[MAXHOSTNAMELEN+1]; + struct sockaddr_in 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+1]; /* host from which recd. */ + int f_prevpri; /* pri of f_prevline */ + int f_prevlen; /* length of f_prevline */ + int f_prevcount; /* repetition cnt of prevline */ + int f_repeatcount; /* number of "repeated" msgs */ +}; + +/* + * 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 in_addr addr; + struct in_addr 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 */ + +char *TypeNames[8] = { + "UNUSED", "FILE", "TTY", "CONSOLE", + "FORW", "USERS", "WALL", "PIPE" +}; + +struct filed *Files; +struct filed consfile; + +int Debug; /* debug flag */ +char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ +char *LocalDomain; /* our local domain name */ +int finet; /* Internet datagram socket */ +int LogPort; /* port number for INET connections */ +int Initialized = 0; /* set when we have initialized ourselves */ +int MarkInterval = 20 * 60; /* interval between marks in seconds */ +int MarkSeq = 0; /* mark sequence number */ +int SecureMode = 0; /* when true, receive only unix domain socks */ +u_int Vogons = 0; /* packets arriving in SecureMode */ + +char bootfile[MAXLINE+1]; /* booted kernel file */ + +struct allowedpeer *AllowedPeers; +int NumAllowed = 0; /* # of AllowedPeer entries */ + +int allowaddr __P((char *)); +void cfline __P((char *, struct filed *, char *)); +char *cvthname __P((struct sockaddr_in *)); +void deadq_enter __P((pid_t)); +int decode __P((const char *, CODE *)); +void die __P((int)); +void domark __P((int)); +void fprintlog __P((struct filed *, int, char *)); +void init __P((int)); +void logerror __P((const char *)); +void logmsg __P((int, char *, char *, int)); +void printline __P((char *, char *)); +void printsys __P((char *)); +int p_open __P((char *, pid_t *)); +void reapchild __P((int)); +char *ttymsg __P((struct iovec *, int, char *, int)); +static void usage __P((void)); +int validate __P((struct sockaddr_in *, const char *)); +void wallmsg __P((struct filed *, struct iovec *)); +int waitdaemon __P((int, int, int)); +void timedout __P((int)); + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int ch, i, l, fklog, len; + struct sockaddr_un sunx, fromunix; + struct sockaddr_in sin, frominet; + FILE *fp; + char *p, *hname, line[MAXLINE + 1]; + struct timeval tv, *tvp; + pid_t ppid; + + while ((ch = getopt(argc, argv, "a:dl:sf:m:p:")) != -1) + switch(ch) { + case 'd': /* debug */ + Debug++; + break; + case 'a': /* allow specific network addresses only */ + if (allowaddr(optarg) == -1) + usage(); + break; + case 'f': /* configuration file */ + ConfFile = optarg; + break; + case 'm': /* mark interval */ + MarkInterval = atoi(optarg) * 60; + break; + case 'p': /* path */ + funixn[0] = optarg; + break; + case 's': /* no network mode */ + SecureMode++; + break; + case 'l': + if (nfunix < MAXFUNIX) + funixn[nfunix++] = optarg; + else + fprintf(stderr, + "syslogd: out of descriptors, ignoring %s\n", + optarg); + break; + case '?': + default: + usage(); + } + if ((argc -= optind) != 0) + usage(); + + if (!Debug) { + ppid = waitdaemon(0, 0, 30); + if (ppid < 0) + err(1, "could not become daemon"); + } else + setlinebuf(stdout); + + if (NumAllowed) + endservent(); + + consfile.f_type = F_CONSOLE; + (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); + (void)gethostname(LocalHostName, sizeof(LocalHostName)); + if ((p = strchr(LocalHostName, '.')) != NULL) { + *p++ = '\0'; + LocalDomain = p; + } else + LocalDomain = ""; + (void)strcpy(bootfile, getbootfile()); + (void)signal(SIGTERM, die); + (void)signal(SIGINT, Debug ? die : SIG_IGN); + (void)signal(SIGQUIT, Debug ? die : SIG_IGN); + (void)signal(SIGCHLD, reapchild); + (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 + for (i = 0; i < nfunix; i++) { + memset(&sunx, 0, sizeof(sunx)); + sunx.sun_family = AF_UNIX; + (void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); + funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); + if (funix[i] < 0 || + bind(funix[i], (struct sockaddr *)&sunx, + SUN_LEN(&sunx)) < 0 || + chmod(funixn[i], 0666) < 0) { + (void) snprintf(line, sizeof line, + "cannot create %s", funixn[i]); + logerror(line); + dprintf("cannot create %s (%d)\n", funixn[i], errno); + if (i == 0) + die(0); + } + } + finet = socket(AF_INET, SOCK_DGRAM, 0); + if (finet >= 0) { + struct servent *sp; + + sp = getservbyname("syslog", "udp"); + if (sp == NULL) { + errno = 0; + logerror("syslog/udp: unknown service"); + die(0); + } + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; + sin.sin_port = LogPort = sp->s_port; + + if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { + logerror("bind"); + if (!Debug) + die(0); + } + } + + if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) < 0) + dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); + + /* tuck my process id away */ + fp = fopen(PidFile, "w"); + if (fp != NULL) { + fprintf(fp, "%d\n", getpid()); + (void) fclose(fp); + } + + dprintf("off & running....\n"); + + init(0); + (void)signal(SIGHUP, init); + + tvp = &tv; + tv.tv_sec = tv.tv_usec = 0; + + for (;;) { + fd_set readfds; + int nfds = 0; + + FD_ZERO(&readfds); + if (fklog != -1) { + FD_SET(fklog, &readfds); + if (fklog > nfds) + nfds = fklog; + } + if (finet != -1) { + FD_SET(finet, &readfds); + if (finet > nfds) + nfds = finet; + } + for (i = 0; i < nfunix; i++) { + if (funix[i] != -1) { + FD_SET(funix[i], &readfds); + if (funix[i] > nfds) + nfds = funix[i]; + } + } + + /*dprintf("readfds = %#x\n", readfds);*/ + nfds = select(nfds+1, &readfds, (fd_set *)NULL, + (fd_set *)NULL, tvp); + if (nfds == 0) { + if (tvp) { + tvp = NULL; + if (ppid != 1) + kill(ppid, SIGALRM); + } + continue; + } + if (nfds < 0) { + if (errno != EINTR) + logerror("select"); + continue; + } + /*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/ + if (fklog != -1 && FD_ISSET(fklog, &readfds)) { + i = read(fklog, line, MAXLINE - 1); + if (i > 0) { + line[i] = '\0'; + printsys(line); + } else if (i < 0 && errno != EINTR) { + logerror("klog"); + fklog = -1; + } + } + if (finet != -1 && FD_ISSET(finet, &readfds)) { + len = sizeof(frominet); + l = recvfrom(finet, line, MAXLINE, 0, + (struct sockaddr *)&frominet, &len); + if (SecureMode) { + Vogons++; + if (!(Vogons & (Vogons - 1))) { + (void)snprintf(line, sizeof line, +"syslogd: discarded %d unwanted packets in secure mode", Vogons); + logmsg(LOG_SYSLOG|LOG_AUTH, line, + LocalHostName, ADDDATE); + } + } else if (l > 0) { + line[l] = '\0'; + hname = cvthname(&frominet); + if (validate(&frominet, hname)) + printline(hname, line); + } else if (l < 0 && errno != EINTR) + logerror("recvfrom inet"); + } + for (i = 0; i < nfunix; i++) { + if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { + len = sizeof(fromunix); + l = recvfrom(funix[i], line, MAXLINE, 0, + (struct sockaddr *)&fromunix, &len); + if (l > 0) { + line[l] = '\0'; + printline(LocalHostName, line); + } else if (l < 0 && errno != EINTR) + logerror("recvfrom unix"); + } + } + } +} + +static void +usage() +{ + + fprintf(stderr, "%s\n%s\n%s\n", + "usage: syslogd [-ds] [-a allowed_peer] [-f config_file]", + " [-m mark_interval] [-p log_socket]", + " [-l log_socket]"); + exit(1); +} + +/* + * Take a raw input line, decode the message, and print the message + * on the appropriate log files. + */ +void +printline(hname, msg) + char *hname; + char *msg; +{ + int c, pri; + char *p, *q, line[MAXLINE + 1]; + + /* test for special codes */ + pri = DEFUPRI; + p = msg; + if (*p == '<') { + pri = 0; + while (isdigit(*++p)) + pri = 10 * pri + (*p - '0'); + if (*p == '>') + ++p; + } + if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) + pri = DEFUPRI; + + /* don't allow users to log kernel messages */ + if (LOG_FAC(pri) == LOG_KERN) + pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); + + q = line; + + while ((c = *p++ & 0177) != '\0' && + q < &line[sizeof(line) - 1]) + if (iscntrl(c)) + if (c == '\n') + *q++ = ' '; + else if (c == '\t') + *q++ = '\t'; + else { + *q++ = '^'; + *q++ = c ^ 0100; + } + else + *q++ = c; + *q = '\0'; + + logmsg(pri, line, hname, 0); +} + +/* + * Take a raw input line from /dev/klog, split and format similar to syslog(). + */ +void +printsys(msg) + char *msg; +{ + int c, pri, flags; + char *p, *q; + + for (p = msg; *p != '\0'; ) { + flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ + pri = DEFSPRI; + if (*p == '<') { + pri = 0; + while (isdigit(*++p)) + pri = 10 * pri + (*p - '0'); + if (*p == '>') + ++p; + } else { + /* kernel printf's come out on console */ + flags |= IGN_CONS; + } + if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) + pri = DEFSPRI; + for (q = p; *q != '\0' && *q != '\n'; q++); + if (*q != '\0') + *q++ = '\0'; + logmsg(pri, p, LocalHostName, flags); + p = q; + } +} + +time_t now; + +/* + * Log a message to the appropriate log files, users, etc. based on + * the priority. + */ +void +logmsg(pri, msg, from, flags) + int pri; + char *msg, *from; + int flags; +{ + struct filed *f; + int i, fac, msglen, omask, prilev; + 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); + prilev = LOG_PRI(pri); + + /* extract program name */ + for(i = 0; i < NAME_MAX; i++) { + if(!isalnum(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", bootfile, msg); + msg = buf; + msglen = strlen(buf); + } + + /* log the message to the particular outputs */ + if (!Initialized) { + f = &consfile; + f->f_file = open(ctty, O_WRONLY, 0); + + if (f->f_file >= 0) { + 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_pmask[fac] < prilev || + f->f_pmask[fac] == INTERNAL_NOPRI) + continue; + /* skip messages with the incorrect program name */ + if(f->f_program) + if(strcmp(prog, f->f_program) != 0) + continue; + + 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 ((flags & MARK) == 0 && msglen == f->f_prevlen && + !strcmp(msg, f->f_prevline) && + !strcmp(from, f->f_prevhost)) { + (void)strncpy(f->f_lasttime, timestamp, 15); + f->f_prevcount++; + dprintf("msg repeated %d times, %ld sec of %d\n", + f->f_prevcount, now - f->f_time, + repeatinterval[f->f_repeatcount]); + /* + * If domark would have logged this by now, + * flush it now (so we don't hold isolated messages), + * but back off so we'll flush less often + * in the future. + */ + if (now > REPEATTIME(f)) { + fprintlog(f, flags, (char *)NULL); + BACKOFF(f); + } + } else { + /* new line, save it */ + if (f->f_prevcount) + fprintlog(f, 0, (char *)NULL); + f->f_repeatcount = 0; + f->f_prevpri = pri; + (void)strncpy(f->f_lasttime, timestamp, 15); + (void)strncpy(f->f_prevhost, from, + sizeof(f->f_prevhost)); + if (msglen < MAXSVLINE) { + f->f_prevlen = msglen; + (void)strcpy(f->f_prevline, msg); + fprintlog(f, flags, (char *)NULL); + } else { + f->f_prevline[0] = 0; + f->f_prevlen = 0; + fprintlog(f, flags, msg); + } + } + } + (void)sigsetmask(omask); +} + +void +fprintlog(f, flags, msg) + struct filed *f; + int flags; + char *msg; +{ + struct iovec iov[6]; + struct iovec *v; + int l; + char line[MAXLINE + 1], repbuf[80], greetings[200]; + char *msgret; + + v = iov; + if (f->f_type == F_WALL) { + v->iov_base = greetings; + v->iov_len = snprintf(greetings, sizeof greetings, + "\r\n\7Message from syslogd@%s at %.24s ...\r\n", + f->f_prevhost, ctime(&now)); + v++; + v->iov_base = ""; + v->iov_len = 0; + v++; + } else { + v->iov_base = f->f_lasttime; + v->iov_len = 15; + v++; + v->iov_base = " "; + v->iov_len = 1; + v++; + } + v->iov_base = f->f_prevhost; + v->iov_len = strlen(v->iov_base); + v++; + v->iov_base = " "; + v->iov_len = 1; + v++; + + if (msg) { + v->iov_base = msg; + v->iov_len = strlen(msg); + } else if (f->f_prevcount > 1) { + v->iov_base = repbuf; + v->iov_len = sprintf(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) { + case F_UNUSED: + dprintf("\n"); + break; + + case F_FORW: + dprintf(" %s\n", f->f_un.f_forw.f_hname); + /* check for local vs remote messages */ + if (strcmp(f->f_prevhost, LocalHostName)) + l = snprintf(line, sizeof line - 1, + "<%d>%.15s Forwarded from %s: %s", + f->f_prevpri, iov[0].iov_base, f->f_prevhost, + iov[4].iov_base); + else + l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", + f->f_prevpri, iov[0].iov_base, iov[4].iov_base); + if (l > MAXLINE) + l = MAXLINE; + if ((finet >= 0) && + (sendto(finet, line, l, 0, + (struct sockaddr *)&f->f_un.f_forw.f_addr, + sizeof(f->f_un.f_forw.f_addr)) != l)) { + int e = errno; + (void)close(f->f_file); + f->f_type = F_UNUSED; + errno = e; + logerror("sendto"); + } + break; + + case F_FILE: + dprintf(" %s\n", f->f_un.f_fname); + v->iov_base = "\n"; + v->iov_len = 1; + if (writev(f->f_file, iov, 6) < 0) { + 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) + (void)fsync(f->f_file); + break; + + case F_PIPE: + dprintf(" %s\n", f->f_un.f_pipe.f_pname); + v->iov_base = "\n"; + 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, 6) < 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_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 = "\r\n"; + v->iov_len = 2; + + errno = 0; /* ttymsg() only sometimes returns an errno */ + if ((msgret = ttymsg(iov, 6, 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 = "\r\n"; + v->iov_len = 2; + wallmsg(f, iov); + break; + } + f->f_prevcount = 0; +} + +/* + * WALLMSG -- Write a message to the world at large + * + * Write the specified message to either the entire + * world, or a list of approved users. + */ +void +wallmsg(f, iov) + struct filed *f; + struct iovec *iov; +{ + static int reenter; /* avoid calling ourselves */ + FILE *uf; + struct utmp ut; + int i; + char *p; + char line[sizeof(ut.ut_line) + 1]; + + if (reenter++) + return; + if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { + logerror(_PATH_UTMP); + reenter = 0; + return; + } + /* NOSTRICT */ + while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { + if (ut.ut_name[0] == '\0') + continue; + strncpy(line, ut.ut_line, sizeof(ut.ut_line)); + line[sizeof(ut.ut_line)] = '\0'; + if (f->f_type == F_WALL) { + if ((p = ttymsg(iov, 6, 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 (!strncmp(f->f_un.f_uname[i], ut.ut_name, + UT_NAMESIZE)) { + if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) + != NULL) { + errno = 0; /* already in msg */ + logerror(p); + } + break; + } + } + } + (void)fclose(uf); + reenter = 0; +} + +void +reapchild(signo) + int signo; +{ + int status, code; + pid_t pid; + struct filed *f; + char buf[256]; + const char *reason; + dq_t q; + + 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. */ + for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) + if (q->dq_pid == pid) { + TAILQ_REMOVE(&deadq_head, q, dq_entries); + free(q); + 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); + + errno = 0; /* Keep strerror() stuff out of logerror messages. */ + f->f_un.f_pipe.f_pid = 0; + if (WIFSIGNALED(status)) { + reason = "due to signal"; + code = WTERMSIG(status); + } else { + reason = "with status"; + code = WEXITSTATUS(status); + if (code == 0) + goto oncemore; /* Exited OK. */ + } + (void)snprintf(buf, sizeof buf, + "Logging subprocess %d (%s) exited %s %d.", + pid, f->f_un.f_pipe.f_pname, + reason, code); + logerror(buf); + break; + } + oncemore: + } +} + +/* + * Return a printable representation of a host address. + */ +char * +cvthname(f) + struct sockaddr_in *f; +{ + struct hostent *hp; + char *p; + + dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); + + if (f->sin_family != AF_INET) { + dprintf("Malformed from address\n"); + return ("???"); + } + hp = gethostbyaddr((char *)&f->sin_addr, + sizeof(struct in_addr), f->sin_family); + if (hp == 0) { + dprintf("Host name for your address (%s) unknown\n", + inet_ntoa(f->sin_addr)); + return (inet_ntoa(f->sin_addr)); + } + if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) + *p = '\0'; + return (hp->h_name); +} + +void +domark(signo) + int signo; +{ + struct filed *f; + dq_t q; + + 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 = TAILQ_NEXT(q, dq_entries)) + switch (q->dq_timeout) { + case 0: + /* Already signalled once, try harder now. */ + kill(q->dq_pid, SIGKILL); + 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. + */ + kill(q->dq_pid, SIGTERM); + /* FALLTROUGH */ + + default: + q->dq_timeout--; + } + + (void)alarm(TIMERINTVL); +} + +/* + * Print syslogd errors some place. + */ +void +logerror(type) + const char *type; +{ + char buf[512]; + + 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); +} + +void +die(signo) + int signo; +{ + struct filed *f; + int was_initialized; + char buf[100]; + int i; + + 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) + (void)close(f->f_file); + } + Initialized = was_initialized; + if (signo) { + dprintf("syslogd: exiting on signal %d\n", signo); + (void)sprintf(buf, "exiting on signal %d", signo); + errno = 0; + logerror(buf); + } + for (i = 0; i < nfunix; i++) + if (funixn[i] && funix[i] != -1) + (void)unlink(funixn[i]); + exit(1); +} + +/* + * INIT -- Initialize syslogd from configuration table + */ +void +init(signo) + int signo; +{ + int i; + FILE *cf; + struct filed *f, *next, **nextp; + char *p; + char cline[LINE_MAX]; + char prog[NAME_MAX+1]; + + dprintf("init\n"); + + /* + * 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: + (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_pid = 0; + break; + } + next = f->f_next; + if(f->f_program) free(f->f_program); + 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)); + cfline("*.ERR\t/dev/console", *nextp, "*"); + (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); + cfline("*.PANIC\t*", (*nextp)->f_next, "*"); + Initialized = 1; + return; + } + + /* + * Foreach line in the conf table, open that file. + */ + f = NULL; + strcpy(prog, "*"); + 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!='!') + continue; + } + if(*p=='!') { + p++; + while(isspace(*p)) p++; + if(!*p) { + strcpy(prog, "*"); + continue; + } + for(i = 0; i < NAME_MAX; i++) { + if(!isalnum(p[i])) + break; + prog[i] = p[i]; + } + prog[i] = 0; + continue; + } + for (p = strchr(cline, '\0'); isspace(*--p);) + continue; + *++p = '\0'; + f = (struct filed *)calloc(1, sizeof(*f)); + *nextp = f; + nextp = &f->f_next; + cfline(cline, f, prog); + } + + /* close the configuration file */ + (void)fclose(cf); + + Initialized = 1; + + if (Debug) { + for (f = Files; f; f = f->f_next) { + for (i = 0; i <= LOG_NFACILITIES; i++) + if (f->f_pmask[i] == INTERNAL_NOPRI) + printf("X "); + else + printf("%d ", f->f_pmask[i]); + printf("%s: ", TypeNames[f->f_type]); + switch (f->f_type) { + case F_FILE: + 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: + 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"); +} + +/* + * Crack a configuration file line + */ +void +cfline(line, f, prog) + char *line; + struct filed *f; + char *prog; +{ + struct hostent *hp; + int i, pri; + char *bp, *p, *q; + char buf[MAXLINE], ebuf[100]; + + dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); + + 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 program name if any */ + if(prog && *prog=='*') prog = NULL; + if(prog) { + f->f_program = calloc(1, strlen(prog)+1); + if(f->f_program) { + strcpy(f->f_program, prog); + } + } + + /* scan through the list of selectors */ + for (p = line; *p && *p != '\t';) { + + /* find the end of this facility name list */ + for (q = p; *q && *q != '\t' && *q++ != '.'; ) + continue; + + /* collect priority name */ + for (bp = buf; *q && !strchr("\t,;", *q); ) + *bp++ = *q++; + *bp = '\0'; + + /* skip cruft */ + while (strchr(", ;", *q)) + q++; + + /* decode priority name */ + if (*buf == '*') + pri = LOG_PRIMASK + 1; + else { + pri = decode(buf, prioritynames); + if (pri < 0) { + (void)snprintf(ebuf, sizeof ebuf, + "unknown priority name \"%s\"", buf); + logerror(ebuf); + return; + } + } + + /* scan facilities */ + while (*p && !strchr("\t.;", *p)) { + for (bp = buf; *p && !strchr("\t,;.", *p); ) + *bp++ = *p++; + *bp = '\0'; + if (*buf == '*') + for (i = 0; i < LOG_NFACILITIES; i++) + f->f_pmask[i] = pri; + else { + i = decode(buf, facilitynames); + if (i < 0) { + (void)snprintf(ebuf, sizeof ebuf, + "unknown facility name \"%s\"", + buf); + logerror(ebuf); + return; + } + f->f_pmask[i >> 3] = pri; + } + while (*p == ',' || *p == ' ') + p++; + } + + p = q; + } + + /* skip to action part */ + while (*p == '\t') + p++; + + switch (*p) + { + case '@': + (void)strcpy(f->f_un.f_forw.f_hname, ++p); + hp = gethostbyname(p); + if (hp == NULL) { + extern int h_errno; + + logerror(hstrerror(h_errno)); + break; + } + memset(&f->f_un.f_forw.f_addr, 0, + sizeof(f->f_un.f_forw.f_addr)); + f->f_un.f_forw.f_addr.sin_family = AF_INET; + f->f_un.f_forw.f_addr.sin_port = LogPort; + memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); + f->f_type = F_FORW; + break; + + case '/': + if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { + f->f_type = F_UNUSED; + logerror(p); + break; + } + if (isatty(f->f_file)) { + if (strcmp(p, ctty) == 0) + f->f_type = F_CONSOLE; + else + f->f_type = F_TTY; + (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); + } else { + (void)strcpy(f->f_un.f_fname, p); + f->f_type = F_FILE; + } + break; + + case '|': + f->f_un.f_pipe.f_pid = 0; + (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); + f->f_type = F_PIPE; + break; + + case '*': + f->f_type = F_WALL; + break; + + default: + for (i = 0; i < MAXUNAMES && *p; i++) { + for (q = p; *q && *q != ','; ) + q++; + (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); + if ((q - p) > UT_NAMESIZE) + f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; + else + f->f_un.f_uname[i][q - p] = '\0'; + while (*q == ',' || *q == ' ') + q++; + p = q; + } + f->f_type = F_USERS; + break; + } +} + + +/* + * Decode a symbolic name to a numeric value + */ +int +decode(name, codetab) + 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); +} + +/* + * 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. + */ +int +waitdaemon(nochdir, noclose, maxwait) + int nochdir, noclose, 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. + */ +void +timedout(sig) + 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. + */ +int +allowaddr(s) + char *s; +{ + char *cp1, *cp2; + struct allowedpeer ap; + struct servent *se; + regex_t re; + int i; + + if ((cp1 = strrchr(s, ':'))) { + /* service/port provided */ + *cp1++ = '\0'; + if (strlen(cp1) == 1 && *cp1 == '*') + /* any port allowed */ + ap.port = htons(0); + else if ((se = getservbyname(cp1, "udp"))) + ap.port = se->s_port; + else { + ap.port = htons((int)strtol(cp1, &cp2, 0)); + if (*cp2 != '\0') + return -1; /* port not numeric */ + } + } else { + if ((se = getservbyname("syslog", "udp"))) + ap.port = se->s_port; + else + /* sanity, should not happen */ + ap.port = htons(514); + } + + /* the regexp's are ugly, but the cleanest way */ + + if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", + REG_EXTENDED)) + /* if RE compilation fails, that's an internal error */ + abort(); + if (regexec(&re, s, 0, 0, 0) == 0) { + /* arg `s' is numeric */ + ap.isnumeric = 1; + if ((cp1 = strchr(s, '/')) != NULL) { + *cp1++ = '\0'; + i = atoi(cp1); + if (i < 0 || i > 32) + return -1; + /* convert masklen to netmask */ + ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); + } + if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) + return -1; + if (cp1 == NULL) { + /* use default netmask */ + if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) + ap.a_mask.s_addr = htonl(IN_CLASSA_NET); + else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) + ap.a_mask.s_addr = htonl(IN_CLASSB_NET); + else + ap.a_mask.s_addr = htonl(IN_CLASSC_NET); + } + } else { + /* arg `s' is domain name */ + ap.isnumeric = 0; + ap.a_name = s; + } + regfree(&re); + + if (Debug) { + printf("allowaddr: rule %d: ", NumAllowed); + if (ap.isnumeric) { + printf("numeric, "); + printf("addr = %s, ", + addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); + printf("mask = %s; ", + addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); + } else + printf("domainname = %s; ", ap.a_name); + printf("port = %d\n", ntohs(ap.port)); + } + + if ((AllowedPeers = realloc(AllowedPeers, + ++NumAllowed * sizeof(struct allowedpeer))) + == NULL) { + fprintf(stderr, "Out of memory!\n"); + exit(EX_OSERR); + } + memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); + return 0; +} + +/* + * Validate that the remote peer has permission to log to us. + */ +int +validate(sin, hname) + struct sockaddr_in *sin; + const char *hname; +{ + int i; + size_t l1, l2; + char *cp, name[MAXHOSTNAMELEN]; + struct allowedpeer *ap; + + if (NumAllowed == 0) + /* traditional behaviour, allow everything */ + return 1; + + strncpy(name, hname, sizeof name); + if (strchr(name, '.') == NULL) { + strncat(name, ".", sizeof name - strlen(name) - 1); + strncat(name, LocalDomain, sizeof name - strlen(name) - 1); + } + dprintf("validate: dgram from IP %s, port %d, name %s;\n", + addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), + ntohs(sin->sin_port), name); + + /* now, walk down the list */ + for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { + if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { + dprintf("rejected in rule %d due to port mismatch.\n", i); + continue; + } + + if (ap->isnumeric) { + if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) + != ap->a_addr.s_addr) { + dprintf("rejected in rule %d due to IP mismatch.\n", i); + 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 *. + */ +int +p_open(prog, pid) + char *prog; + pid_t *pid; +{ + int pfd[2], nulldesc, i; + 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] = "sh"; + argv[1] = "-c"; + argv[2] = prog; + argv[3] = NULL; + + 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); + } + return pfd[1]; +} + +void +deadq_enter(pid) + pid_t pid; +{ + dq_t p; + + p = malloc(sizeof(struct deadq_entry)); + if (p == 0) { + errno = 0; + logerror("panic: out of virtual memory!"); + exit(1); + } + + p->dq_pid = pid; + p->dq_timeout = DQ_TIMO_INIT; + TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); +} |
