/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1983, 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2018 Prodrive Technologies, https://prodrive-technologies.com/ * Author: Ed Schouten <ed@FreeBSD.org> * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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> /* * 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 8192 /* maximum line length */ #define MAXSVLINE MAXLINE /* maximum saved line length */ #define DEFUPRI (LOG_USER|LOG_NOTICE) #define DEFSPRI (LOG_KERN|LOG_CRIT) #define TIMERINTVL 30 /* interval for checking flush, mark */ #define TTYMSGTIME 1 /* timeout passed to ttymsg */ #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ #include <sys/param.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/queue.h> #include <sys/resource.h> #include <sys/socket.h> #include <sys/stat.h> #include <sys/syslimits.h> #include <sys/time.h> #include <sys/uio.h> #include <sys/un.h> #include <sys/wait.h> #if defined(INET) || defined(INET6) #include <netinet/in.h> #include <arpa/inet.h> #endif #include <assert.h> #include <ctype.h> #include <dirent.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <fnmatch.h> #include <libutil.h> #include <limits.h> #include <netdb.h> #include <paths.h> #include <signal.h> #include <stdbool.h> #include <stddef.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sysexits.h> #include <unistd.h> #include <utmpx.h> #include <regex.h> #include "pathnames.h" #include "ttymsg.h" #define SYSLOG_NAMES #include <sys/syslog.h> static const char *ConfFile = _PATH_LOGCONF; static const char *PidFile = _PATH_LOGPID; static const char ctty[] = _PATH_CONSOLE; static const char include_str[] = "include"; static const char include_ext[] = ".conf"; #define dprintf if (Debug) printf #define MAXUNAMES 20 /* maximum number of user names */ #define sstosa(ss) ((struct sockaddr *)(ss)) #ifdef INET #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) #endif #ifdef INET6 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) #define s6_addr32 __u6_addr.__u6_addr32 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) #endif /* * List of peers and sockets for binding. */ struct peer { const char *pe_name; const char *pe_serv; mode_t pe_mode; STAILQ_ENTRY(peer) next; }; static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); struct socklist { struct addrinfo sl_ai; #define sl_sa sl_ai.ai_addr #define sl_salen sl_ai.ai_addrlen #define sl_family sl_ai.ai_family int sl_socket; struct peer *sl_peer; int (*sl_recv)(struct socklist *); STAILQ_ENTRY(socklist) next; }; static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); /* * Flags to logmsg(). */ #define IGN_CONS 0x001 /* don't print on console */ #define SYNC_FILE 0x002 /* do fsync on file after printing */ #define MARK 0x008 /* this message is a mark */ #define ISKERNEL 0x010 /* kernel generated message */ /* Timestamps of log entries. */ struct logtime { struct tm tm; suseconds_t usec; }; /* Traditional syslog timestamp format. */ #define RFC3164_DATELEN 15 #define RFC3164_DATEFMT "%b %e %H:%M:%S" /* * This structure holds a property-based filter */ struct prop_filter { uint8_t prop_type; #define PROP_TYPE_NOOP 0 #define PROP_TYPE_MSG 1 #define PROP_TYPE_HOSTNAME 2 #define PROP_TYPE_PROGNAME 3 uint8_t cmp_type; #define PROP_CMP_CONTAINS 1 #define PROP_CMP_EQUAL 2 #define PROP_CMP_STARTS 3 #define PROP_CMP_REGEX 4 uint16_t cmp_flags; #define PROP_FLAG_EXCLUDE (1 << 0) #define PROP_FLAG_ICASE (1 << 1) union { char *p_strval; regex_t *p_re; } pflt_uniptr; #define pflt_strval pflt_uniptr.p_strval #define pflt_re pflt_uniptr.p_re size_t pflt_strlen; }; /* * 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 is F_PIPE and f_pid > 0. */ struct filed { STAILQ_ENTRY(filed) next; /* next in linked list */ short f_type; /* entry type, see below */ short f_file; /* file descriptor */ time_t f_time; /* time this was last written */ char *f_host; /* host from which to recd. */ u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ #define PRI_LT 0x1 #define PRI_EQ 0x2 #define PRI_GT 0x4 char *f_program; /* program this applies to */ struct prop_filter *f_prop_filter; /* property-based filter */ union { char f_uname[MAXUNAMES][MAXLOGNAME]; struct { char f_hname[MAXHOSTNAMELEN]; struct addrinfo *f_addr; } f_forw; /* forwarding address */ char f_fname[MAXPATHLEN]; struct { char f_pname[MAXPATHLEN]; pid_t f_pid; } f_pipe; } f_un; #define fu_uname f_un.f_uname #define fu_forw_hname f_un.f_forw.f_hname #define fu_forw_addr f_un.f_forw.f_addr #define fu_fname f_un.f_fname #define fu_pipe_pname f_un.f_pipe.f_pname #define fu_pipe_pid f_un.f_pipe.f_pid char f_prevline[MAXSVLINE]; /* last message logged */ struct logtime f_lasttime; /* time of last occurrence */ int f_prevpri; /* pri of f_prevline */ size_t f_prevlen; /* length of f_prevline */ int f_prevcount; /* repetition cnt of prevline */ u_int f_repeatcount; /* number of "repeated" msgs */ int f_flags; /* file-specific flags */ #define FFLAG_SYNC 0x01 #define FFLAG_NEEDSYNC 0x02 }; /* * Queue of about-to-be dead processes we should watch out for. */ struct deadq_entry { pid_t dq_pid; int dq_timeout; TAILQ_ENTRY(deadq_entry) dq_entries; }; static TAILQ_HEAD(, deadq_entry) deadq_head = TAILQ_HEAD_INITIALIZER(deadq_head); /* * The timeout to apply to processes waiting on the dead queue. Unit * of measure is `mark intervals', i.e. 20 minutes by default. * Processes on the dead queue will be terminated after that time. */ #define DQ_TIMO_INIT 2 /* * Struct to hold records of network addresses that are allowed to log * to us. */ struct allowedpeer { int isnumeric; u_short port; union { struct { struct sockaddr_storage addr; struct sockaddr_storage mask; } numeric; char *name; } u; #define a_addr u.numeric.addr #define a_mask u.numeric.mask #define a_name u.name STAILQ_ENTRY(allowedpeer) next; }; static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); /* * Intervals at which we flush out "message repeated" messages, * in seconds after previous message is logged. After each flush, * we move to the next interval until we reach the largest. */ static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ #define MAXREPEAT (nitems(repeatinterval) - 1) #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) #define BACKOFF(f) do { \ if (++(f)->f_repeatcount > MAXREPEAT) \ (f)->f_repeatcount = MAXREPEAT; \ } while (0) /* values for f_type */ #define F_UNUSED 0 /* unused entry */ #define F_FILE 1 /* regular file */ #define F_TTY 2 /* terminal */ #define F_CONSOLE 3 /* console terminal */ #define F_FORW 4 /* remote machine */ #define F_USERS 5 /* list of users */ #define F_WALL 6 /* everyone logged on */ #define F_PIPE 7 /* pipe to program */ static const char *TypeNames[] = { "UNUSED", "FILE", "TTY", "CONSOLE", "FORW", "USERS", "WALL", "PIPE" }; static STAILQ_HEAD(, filed) fhead = STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ static struct filed consfile; /* Console */ static int Debug; /* debug flag */ static int Foreground = 0; /* Run in foreground, instead of daemonizing */ static int resolve = 1; /* resolve hostname */ static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ static const char *LocalDomain; /* our local domain name */ static int Initialized; /* set when we have initialized ourselves */ static int MarkInterval = 20 * 60; /* interval between marks in seconds */ static int MarkSeq; /* mark sequence number */ static int NoBind; /* don't bind() as suggested by RFC 3164 */ static int SecureMode; /* when true, receive only unix domain socks */ static int MaxForwardLen = 1024; /* max length of forwared message */ #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[MAXPATHLEN]; /* booted kernel file */ static int RemoteAddDate; /* Always set the date on remote messages */ static int RemoteHostname; /* Log remote hostname from the message */ static int UniquePriority; /* Only log specified priority? */ static int LogFacPri; /* Put facility and priority in log message: */ /* 0=no, 1=numeric, 2=names */ static int KeepKernFac; /* Keep remotely logged kernel facility */ static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ static struct pidfh *pfh; static int sigpipe[2]; /* Pipe to catch a signal during select(). */ static bool RFC3164OutputFormat = true; /* Use legacy format by default. */ static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; struct iovlist; static int allowaddr(char *); static int addfile(struct filed *); static int addpeer(struct peer *); static int addsock(struct addrinfo *, struct socklist *); static struct filed *cfline(const char *, const char *, const char *, const char *); static const char *cvthname(struct sockaddr *); static void deadq_enter(pid_t, const char *); static int deadq_remove(struct deadq_entry *); static int deadq_removebypid(pid_t); static int decode(const char *, const CODE *); static void die(int) __dead2; static void dodie(int); static void dofsync(void); static void domark(int); static void fprintlog_first(struct filed *, const char *, const char *, const char *, const char *, const char *, const char *, int); static void fprintlog_write(struct filed *, struct iovlist *, int); static void fprintlog_successive(struct filed *, int); static void init(int); static void logerror(const char *); static void logmsg(int, const struct logtime *, const char *, const char *, const char *, const char *, const char *, const char *, int); static void log_deadchild(pid_t, int, const char *); static void markit(void); static int socksetup(struct peer *); static int socklist_recv_file(struct socklist *); static int socklist_recv_sock(struct socklist *); static int socklist_recv_signal(struct socklist *); static void sighandler(int); static int skip_message(const char *, const char *, int); static int evaluate_prop_filter(const struct prop_filter *filter, const char *value); static int prop_filter_compile(struct prop_filter *pfilter, char *filterstr); static void parsemsg(const char *, char *); static void printsys(char *); static int p_open(const char *, pid_t *); static void reapchild(int); static const char *ttymsg_check(struct iovec *, int, char *, int); static void usage(void); static int validate(struct sockaddr *, const char *); static void unmapped(struct sockaddr *); static void wallmsg(struct filed *, struct iovec *, const int iovlen); static int waitdaemon(int); static void timedout(int); static void increase_rcvbuf(int); static void close_filed(struct filed *f) { if (f == NULL || f->f_file == -1) return; switch (f->f_type) { case F_FORW: if (f->fu_forw_addr != NULL) { freeaddrinfo(f->fu_forw_addr); f->fu_forw_addr = NULL; } /* FALLTHROUGH */ case F_FILE: case F_TTY: case F_CONSOLE: f->f_type = F_UNUSED; break; case F_PIPE: f->fu_pipe_pid = 0; break; } (void)close(f->f_file); f->f_file = -1; } static int addfile(struct filed *f0) { struct filed *f; f = calloc(1, sizeof(*f)); if (f == NULL) err(1, "malloc failed"); *f = *f0; STAILQ_INSERT_TAIL(&fhead, f, next); return (0); } static int addpeer(struct peer *pe0) { struct peer *pe; pe = calloc(1, sizeof(*pe)); if (pe == NULL) err(1, "malloc failed"); *pe = *pe0; STAILQ_INSERT_TAIL(&pqueue, pe, next); return (0); } static int addsock(struct addrinfo *ai, struct socklist *sl0) { struct socklist *sl; /* Copy *ai->ai_addr to the tail of struct socklist if any. */ sl = calloc(1, sizeof(*sl) + ((ai != NULL) ? ai->ai_addrlen : 0)); if (sl == NULL) err(1, "malloc failed"); *sl = *sl0; if (ai != NULL) { memcpy(&sl->sl_ai, ai, sizeof(*ai)); if (ai->ai_addrlen > 0) { memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen); sl->sl_sa = (struct sockaddr *)(sl + 1); } else sl->sl_sa = NULL; } STAILQ_INSERT_TAIL(&shead, sl, next); return (0); } int main(int argc, char *argv[]) { int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; fd_set *fdsr = NULL; struct timeval tv, *tvp; struct peer *pe; struct socklist *sl; pid_t ppid = 1, spid; char *p; if (madvise(NULL, 0, MADV_PROTECT) != 0) dprintf("madvise() failed: %s\n", strerror(errno)); while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:M:m:nNoO:p:P:sS:Tuv")) != -1) switch (ch) { #ifdef INET case '4': family = PF_INET; break; #endif #ifdef INET6 case '6': family = PF_INET6; break; #endif case '8': mask_C1 = 0; break; case 'A': send_to_all++; break; case 'a': /* allow specific network addresses only */ if (allowaddr(optarg) == -1) usage(); break; case 'b': bflag = 1; p = strchr(optarg, ']'); if (p != NULL) p = strchr(p + 1, ':'); else { p = strchr(optarg, ':'); if (p != NULL && strchr(p + 1, ':') != NULL) p = NULL; /* backward compatibility */ } if (p == NULL) { /* A hostname or filename only. */ addpeer(&(struct peer){ .pe_name = optarg, .pe_serv = "syslog" }); } else { /* The case of "name:service". */ *p++ = '\0'; addpeer(&(struct peer){ .pe_serv = p, .pe_name = (strlen(optarg) == 0) ? NULL : optarg, }); } break; case 'c': no_compress++; break; case 'C': logflags |= O_CREAT; break; case 'd': /* debug */ Debug++; break; case 'f': /* configuration file */ ConfFile = optarg; break; case 'F': /* run in foreground instead of daemon */ Foreground++; break; case 'H': RemoteHostname = 1; break; case 'k': /* keep remote kern fac */ KeepKernFac = 1; break; case 'l': case 'p': case 'S': { long perml; mode_t mode; char *name, *ep; if (ch == 'l') mode = DEFFILEMODE; else if (ch == 'p') { mode = DEFFILEMODE; pflag = 1; } else { mode = S_IRUSR | S_IWUSR; Sflag = 1; } if (optarg[0] == '/') name = optarg; else if ((name = strchr(optarg, ':')) != NULL) { *name++ = '\0'; if (name[0] != '/') errx(1, "socket name must be absolute " "path"); if (isdigit(*optarg)) { perml = strtol(optarg, &ep, 8); if (*ep || perml < 0 || perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) errx(1, "invalid mode %s, exiting", optarg); mode = (mode_t )perml; } else errx(1, "invalid mode %s, exiting", optarg); } else errx(1, "invalid filename %s, exiting", optarg); addpeer(&(struct peer){ .pe_name = name, .pe_mode = mode }); break; } case 'M': /* max length of forwarded message */ MaxForwardLen = atoi(optarg); if (MaxForwardLen < 480) errx(1, "minimum length limit of forwarded " "messages is 480 bytes"); break; case 'm': /* mark interval */ MarkInterval = atoi(optarg) * 60; break; case 'N': NoBind = 1; if (!SecureMode) SecureMode = 1; break; case 'n': resolve = 0; break; case 'O': if (strcmp(optarg, "bsd") == 0 || strcmp(optarg, "rfc3164") == 0) RFC3164OutputFormat = true; else if (strcmp(optarg, "syslog") == 0 || strcmp(optarg, "rfc5424") == 0) RFC3164OutputFormat = false; else usage(); break; case 'o': use_bootfile = 1; break; case 'P': /* path for alt. PID */ PidFile = optarg; break; case 's': /* no network mode */ SecureMode++; break; case 'T': RemoteAddDate = 1; break; case 'u': /* only log specified priority */ UniquePriority++; break; case 'v': /* log facility and priority */ LogFacPri++; break; default: usage(); } if ((argc -= optind) != 0) usage(); if (RFC3164OutputFormat && MaxForwardLen > 1024) errx(1, "RFC 3164 messages may not exceed 1024 bytes"); /* Pipe to catch a signal during select(). */ s = pipe2(sigpipe, O_CLOEXEC); if (s < 0) { err(1, "cannot open a pipe for signals"); } else { addsock(NULL, &(struct socklist){ .sl_socket = sigpipe[0], .sl_recv = socklist_recv_signal }); } /* Listen by default: /dev/klog. */ s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); if (s < 0) { dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); } else { addsock(NULL, &(struct socklist){ .sl_socket = s, .sl_recv = socklist_recv_file, }); } /* Listen by default: *:514 if no -b flag. */ if (bflag == 0) addpeer(&(struct peer){ .pe_serv = "syslog" }); /* Listen by default: /var/run/log if no -p flag. */ if (pflag == 0) addpeer(&(struct peer){ .pe_name = _PATH_LOG, .pe_mode = DEFFILEMODE, }); /* Listen by default: /var/run/logpriv if no -S flag. */ if (Sflag == 0) addpeer(&(struct peer){ .pe_name = _PATH_LOG_PRIV, .pe_mode = S_IRUSR | S_IWUSR, }); STAILQ_FOREACH(pe, &pqueue, next) socksetup(pe); pfh = pidfile_open(PidFile, 0600, &spid); if (pfh == NULL) { if (errno == EEXIST) errx(1, "syslogd already running, pid: %d", spid); warn("cannot open pid file"); } if ((!Foreground) && (!Debug)) { ppid = waitdaemon(30); if (ppid < 0) { warn("could not become daemon"); pidfile_remove(pfh); exit(1); } } else if (Debug) setlinebuf(stdout); consfile.f_type = F_CONSOLE; (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, sizeof(consfile.fu_fname)); (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); (void)signal(SIGTERM, dodie); (void)signal(SIGINT, Debug ? dodie : SIG_IGN); (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); (void)signal(SIGHUP, sighandler); (void)signal(SIGCHLD, sighandler); (void)signal(SIGALRM, domark); (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ (void)alarm(TIMERINTVL); /* tuck my process id away */ pidfile_write(pfh); dprintf("off & running....\n"); tvp = &tv; tv.tv_sec = tv.tv_usec = 0; STAILQ_FOREACH(sl, &shead, next) { if (sl->sl_socket > fdsrmax) fdsrmax = sl->sl_socket; } fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), sizeof(*fdsr)); if (fdsr == NULL) errx(1, "calloc fd_set"); for (;;) { if (Initialized == 0) init(0); else if (WantInitialize) init(WantInitialize); if (WantReapchild) reapchild(WantReapchild); if (MarkSet) markit(); if (WantDie) { free(fdsr); die(WantDie); } bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * sizeof(*fdsr)); STAILQ_FOREACH(sl, &shead, next) { if (sl->sl_socket != -1 && sl->sl_recv != NULL) FD_SET(sl->sl_socket, fdsr); } i = select(fdsrmax + 1, fdsr, NULL, NULL, needdofsync ? &tv : tvp); switch (i) { case 0: dofsync(); needdofsync = 0; if (tvp) { tvp = NULL; if (ppid != 1) kill(ppid, SIGALRM); } continue; case -1: if (errno != EINTR) logerror("select"); continue; } STAILQ_FOREACH(sl, &shead, next) { if (FD_ISSET(sl->sl_socket, fdsr)) (*sl->sl_recv)(sl); } } free(fdsr); } static int socklist_recv_signal(struct socklist *sl __unused) { ssize_t len; int i, nsig, signo; if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { logerror("ioctl(FIONREAD)"); err(1, "signal pipe read failed"); } nsig = i / sizeof(signo); dprintf("# of received signals = %d\n", nsig); for (i = 0; i < nsig; i++) { len = read(sigpipe[0], &signo, sizeof(signo)); if (len != sizeof(signo)) { logerror("signal pipe read failed"); err(1, "signal pipe read failed"); } dprintf("Received signal: %d from fd=%d\n", signo, sigpipe[0]); switch (signo) { case SIGHUP: WantInitialize = 1; break; case SIGCHLD: WantReapchild = 1; break; } } return (0); } static int socklist_recv_sock(struct socklist *sl) { struct sockaddr_storage ss; struct sockaddr *sa = (struct sockaddr *)&ss; socklen_t sslen; const char *hname; char line[MAXLINE + 1]; int len; sslen = sizeof(ss); len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); dprintf("received sa_len = %d\n", sslen); if (len == 0) return (-1); if (len < 0) { if (errno != EINTR) logerror("recvfrom"); return (-1); } /* Received valid data. */ line[len] = '\0'; if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) hname = LocalHostName; else { hname = cvthname(sa); unmapped(sa); if (validate(sa, hname) == 0) { dprintf("Message from %s was ignored.", hname); return (-1); } } parsemsg(hname, line); return (0); } static void unmapped(struct sockaddr *sa) { #if defined(INET) && defined(INET6) struct sockaddr_in6 *sin6; struct sockaddr_in sin; if (sa == NULL || sa->sa_family != AF_INET6 || sa->sa_len != sizeof(*sin6)) return; sin6 = satosin6(sa); if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) return; sin = (struct sockaddr_in){ .sin_family = AF_INET, .sin_len = sizeof(sin), .sin_port = sin6->sin6_port }; memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], sizeof(sin.sin_addr)); memcpy(sa, &sin, sizeof(sin)); #else if (sa == NULL) return; #endif } static void usage(void) { fprintf(stderr, "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" " [-b bind_address] [-f config_file]\n" " [-l [mode:]path] [-M fwd_length]\n" " [-m mark_interval] [-O format] [-P pid_file]\n" " [-p log_socket] [-S logpriv_socket]\n"); exit(1); } /* * Removes characters from log messages that are unsafe to display. * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? */ static void parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) { char *q; int c; q = out; while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 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'; } /* * Parses a syslog message according to RFC 5424, assuming that PRI and * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The * parsed result is passed to logmsg(). */ static void parsemsg_rfc5424(const char *from, int pri, char *msg) { const struct logtime *timestamp; struct logtime timestamp_remote; const char *omsg, *hostname, *app_name, *procid, *msgid, *structured_data; char line[MAXLINE + 1]; #define FAIL_IF(field, expr) do { \ if (expr) { \ dprintf("Failed to parse " field " from %s: %s\n", \ from, omsg); \ return; \ } \ } while (0) #define PARSE_CHAR(field, sep) do { \ FAIL_IF(field, *msg != sep); \ ++msg; \ } while (0) #define IF_NOT_NILVALUE(var) \ if (msg[0] == '-' && msg[1] == ' ') { \ msg += 2; \ var = NULL; \ } else if (msg[0] == '-' && msg[1] == '\0') { \ ++msg; \ var = NULL; \ } else omsg = msg; IF_NOT_NILVALUE(timestamp) { /* Parse RFC 3339-like timestamp. */ #define PARSE_NUMBER(dest, length, min, max) do { \ int i, v; \ \ v = 0; \ for (i = 0; i < length; ++i) { \ FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ v = v * 10 + *msg++ - '0'; \ } \ FAIL_IF("TIMESTAMP", v < min || v > max); \ dest = v; \ } while (0) /* Date and time. */ memset(&timestamp_remote, 0, sizeof(timestamp_remote)); PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); timestamp_remote.tm.tm_year -= 1900; PARSE_CHAR("TIMESTAMP", '-'); PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); --timestamp_remote.tm.tm_mon; PARSE_CHAR("TIMESTAMP", '-'); PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); PARSE_CHAR("TIMESTAMP", 'T'); PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); PARSE_CHAR("TIMESTAMP", ':'); PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); PARSE_CHAR("TIMESTAMP", ':'); PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); /* Perform normalization. */ timegm(&timestamp_remote.tm); /* Optional: fractional seconds. */ if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { int i; ++msg; for (i = 100000; i != 0; i /= 10) { if (*msg < '0' || *msg > '9') break; timestamp_remote.usec += (*msg++ - '0') * i; } } /* Timezone. */ if (*msg == 'Z') { /* UTC. */ ++msg; } else { int sign, tz_hour, tz_min; /* Local time zone offset. */ FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); sign = *msg++ == '-' ? -1 : 1; PARSE_NUMBER(tz_hour, 2, 0, 23); PARSE_CHAR("TIMESTAMP", ':'); PARSE_NUMBER(tz_min, 2, 0, 59); timestamp_remote.tm.tm_gmtoff = sign * (tz_hour * 3600 + tz_min * 60); } #undef PARSE_NUMBER PARSE_CHAR("TIMESTAMP", ' '); timestamp = RemoteAddDate ? NULL : &timestamp_remote; } /* String fields part of the HEADER. */ #define PARSE_STRING(field, var) \ IF_NOT_NILVALUE(var) { \ var = msg; \ while (*msg >= '!' && *msg <= '~') \ ++msg; \ FAIL_IF(field, var == msg); \ PARSE_CHAR(field, ' '); \ msg[-1] = '\0'; \ } PARSE_STRING("HOSTNAME", hostname); if (hostname == NULL || !RemoteHostname) hostname = from; PARSE_STRING("APP-NAME", app_name); PARSE_STRING("PROCID", procid); PARSE_STRING("MSGID", msgid); #undef PARSE_STRING /* Structured data. */ #define PARSE_SD_NAME() do { \ const char *start; \ \ start = msg; \ while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ *msg != ']' && *msg != '"') \ ++msg; \ FAIL_IF("STRUCTURED-NAME", start == msg); \ } while (0) IF_NOT_NILVALUE(structured_data) { structured_data = msg; /* SD-ELEMENT. */ while (*msg == '[') { ++msg; /* SD-ID. */ PARSE_SD_NAME(); /* SD-PARAM. */ while (*msg == ' ') { ++msg; /* PARAM-NAME. */ PARSE_SD_NAME(); PARSE_CHAR("STRUCTURED-NAME", '='); PARSE_CHAR("STRUCTURED-NAME", '"'); while (*msg != '"') { FAIL_IF("STRUCTURED-NAME", *msg == '\0'); if (*msg++ == '\\') { FAIL_IF("STRUCTURED-NAME", *msg == '\0'); ++msg; } } ++msg; } PARSE_CHAR("STRUCTURED-NAME", ']'); } PARSE_CHAR("STRUCTURED-NAME", ' '); msg[-1] = '\0'; } #undef PARSE_SD_NAME #undef FAIL_IF #undef PARSE_CHAR #undef IF_NOT_NILVALUE parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); logmsg(pri, timestamp, hostname, app_name, procid, msgid, structured_data, line, 0); } /* * Returns the length of the application name ("TAG" in RFC 3164 * terminology) and process ID from a message if present. */ static void parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p, ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p) { const char *m, *procid_begin; size_t app_name_length, procid_length; m = msg; /* Application name. */ app_name_length = strspn(m, "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "0123456789" "_-/"); if (app_name_length == 0) goto bad; m += app_name_length; /* Process identifier (optional). */ if (*m == '[') { procid_begin = ++m; procid_length = strspn(m, "0123456789"); if (procid_length == 0) goto bad; m += procid_length; if (*m++ != ']') goto bad; } else { procid_begin = NULL; procid_length = 0; } /* Separator. */ if (m[0] != ':' || m[1] != ' ') goto bad; *app_name_length_p = app_name_length; if (procid_begin_offset_p != NULL) *procid_begin_offset_p = procid_begin == NULL ? 0 : procid_begin - msg; if (procid_length_p != NULL) *procid_length_p = procid_length; return; bad: *app_name_length_p = 0; if (procid_begin_offset_p != NULL) *procid_begin_offset_p = 0; if (procid_length_p != NULL) *procid_length_p = 0; } /* * Trims the application name ("TAG" in RFC 3164 terminology) and * process ID from a message if present. */ static void parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, const char **procid) { char *m, *app_name_begin, *procid_begin; size_t app_name_length, procid_length; ptrdiff_t procid_begin_offset; m = *msg; app_name_begin = m; parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length, &procid_begin_offset, &procid_length); if (app_name_length == 0) goto bad; procid_begin = procid_begin_offset == 0 ? NULL : app_name_begin + procid_begin_offset; /* Split strings from input. */ app_name_begin[app_name_length] = '\0'; m += app_name_length + 1; if (procid_begin != NULL) { procid_begin[procid_length] = '\0'; m += procid_length + 2; } *msg = m + 1; *app_name = app_name_begin; *procid = procid_begin; return; bad: *app_name = NULL; *procid = NULL; } /* * Parses a syslog message according to RFC 3164, assuming that PRI * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed * result is passed to logmsg(). */ static void parsemsg_rfc3164(const char *from, int pri, char *msg) { struct tm tm_parsed; const struct logtime *timestamp; struct logtime timestamp_remote; const char *app_name, *procid; size_t i, msglen; char line[MAXLINE + 1]; /* * Parse the TIMESTAMP provided by the remote side. If none is * found, assume this is not an RFC 3164 formatted message, * only containing a TAG and a MSG. */ timestamp = NULL; if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { msg += RFC3164_DATELEN + 1; if (!RemoteAddDate) { struct tm tm_now; time_t t_now; int year; /* * As the timestamp does not contain the year * number, daylight saving time information, nor * a time zone, attempt to infer it. Due to * clock skews, the timestamp may even be part * of the next year. Use the last year for which * the timestamp is at most one week in the * future. * * This loop can only run for at most three * iterations before terminating. */ t_now = time(NULL); localtime_r(&t_now, &tm_now); for (year = tm_now.tm_year + 1;; --year) { assert(year >= tm_now.tm_year - 1); timestamp_remote.tm = tm_parsed; timestamp_remote.tm.tm_year = year; timestamp_remote.tm.tm_isdst = -1; timestamp_remote.usec = 0; if (mktime(&timestamp_remote.tm) < t_now + 7 * 24 * 60 * 60) break; } timestamp = &timestamp_remote; } /* * A single space character MUST also follow the HOSTNAME field. */ msglen = strlen(msg); for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { if (msg[i] == ' ') { if (RemoteHostname) { msg[i] = '\0'; from = msg; } msg += i + 1; break; } /* * Support non RFC compliant messages, without hostname. */ if (msg[i] == ':') break; } if (i == MIN(MAXHOSTNAMELEN, msglen)) { dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); return; } } /* Remove the TAG, if present. */ parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); } /* * Takes a raw input line, extracts PRI and determines whether the * message is formatted according to RFC 3164 or RFC 5424. Continues * parsing of addition fields in the message according to those * standards and prints the message on the appropriate log files. */ static void parsemsg(const char *from, char *msg) { char *q; long n; size_t i; int pri; i = -1; pri = DEFUPRI; /* Parse PRI. */ if (msg[0] == '<' && isdigit(msg[1])) { for (i = 2; i <= 4; i++) { if (msg[i] == '>') { errno = 0; n = strtol(msg + 1, &q, 10); if (errno == 0 && *q == msg[i] && n >= 0 && n <= INT_MAX) { pri = n; msg += i + 1; i = 0; } break; } } } 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)); /* Parse VERSION. */ if (i == 0 && msg[0] == '1' && msg[1] == ' ') parsemsg_rfc5424(from, pri, msg + 2); else parsemsg_rfc3164(from, pri, msg); } /* * Read /dev/klog while data are available, split into lines. */ static int socklist_recv_file(struct socklist *sl) { char *p, *q, line[MAXLINE + 1]; int len, i; len = 0; for (;;) { i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); if (i > 0) { line[i + len] = '\0'; } else { if (i < 0 && errno != EINTR && errno != EAGAIN) { logerror("klog"); close(sl->sl_socket); sl->sl_socket = -1; } break; } for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { *q = '\0'; printsys(p); } len = strlen(p); if (len >= MAXLINE - 1) { printsys(p); len = 0; } if (len > 0) memmove(line, p, len + 1); } if (len > 0) printsys(line); return (len); } /* * Take a raw input line from /dev/klog, format similar to syslog(). */ static void printsys(char *msg) { char *p, *q; long n; int flags, isprintf, pri; flags = ISKERNEL | SYNC_FILE; /* 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, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, 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; } /* * Match some property of the message against a filter. * Return a non-0 value if the message must be ignored * based on the filter. */ static int evaluate_prop_filter(const struct prop_filter *filter, const char *value) { const char *s = NULL; const int exclude = ((filter->cmp_flags & PROP_FLAG_EXCLUDE) > 0); size_t valuelen; if (value == NULL) return (-1); if (filter->cmp_type == PROP_CMP_REGEX) { if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0) return (exclude); else return (!exclude); } valuelen = strlen(value); /* a shortcut for equal with different length is always false */ if (filter->cmp_type == PROP_CMP_EQUAL && valuelen != filter->pflt_strlen) return (!exclude); if (filter->cmp_flags & PROP_FLAG_ICASE) s = strcasestr(value, filter->pflt_strval); else s = strstr(value, filter->pflt_strval); /* * PROP_CMP_CONTAINS true if s * PROP_CMP_STARTS true if s && s == value * PROP_CMP_EQUAL true if s && s == value && * valuelen == filter->pflt_strlen * (and length match is checked * already) */ switch (filter->cmp_type) { case PROP_CMP_STARTS: case PROP_CMP_EQUAL: if (s != value) return (!exclude); /* FALLTHROUGH */ case PROP_CMP_CONTAINS: if (s) return (exclude); else return (!exclude); break; default: /* unknown cmp_type */ break; } return (-1); } /* * Logs a message to the appropriate log files, users, etc. based on the * priority. Log messages are formatted according to RFC 3164 or * RFC 5424 in subsequent fprintlog_*() functions. */ static void logmsg(int pri, const struct logtime *timestamp, const char *hostname, const char *app_name, const char *procid, const char *msgid, const char *structured_data, const char *msg, int flags) { struct timeval tv; struct logtime timestamp_now; struct filed *f; size_t savedlen; int fac, prilev; char saved[MAXSVLINE], kernel_app_name[100]; dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", pri, flags, hostname, msg); (void)gettimeofday(&tv, NULL); now = tv.tv_sec; if (timestamp == NULL) { localtime_r(&now, &timestamp_now.tm); timestamp_now.usec = tv.tv_usec; timestamp = &timestamp_now; } /* extract facility and priority level */ if (flags & MARK) fac = LOG_NFACILITIES; else fac = LOG_FAC(pri); /* Check maximum facility number. */ if (fac > LOG_NFACILITIES) return; prilev = LOG_PRI(pri); /* * Lookup kernel app name from log prefix if present. * This is only used for local program specification matching. */ if (flags & ISKERNEL) { size_t kernel_app_name_length; parsemsg_rfc3164_get_app_name_procid(msg, &kernel_app_name_length, NULL, NULL); if (kernel_app_name_length != 0) { strlcpy(kernel_app_name, msg, MIN(sizeof(kernel_app_name), kernel_app_name_length + 1)); } else kernel_app_name[0] = '\0'; } /* 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) { f->f_lasttime = *timestamp; fprintlog_first(f, hostname, app_name, procid, msgid, structured_data, msg, flags); close(f->f_file); f->f_file = -1; } return; } /* * Store all of the fields of the message, except the timestamp, * in a single string. This string is used to detect duplicate * messages. */ assert(hostname != NULL); assert(msg != NULL); savedlen = snprintf(saved, sizeof(saved), "%d %s %s %s %s %s %s", pri, hostname, app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, msgid == NULL ? "-" : msgid, structured_data == NULL ? "-" : structured_data, msg); STAILQ_FOREACH(f, &fhead, next) { /* skip messages that are incorrect priority */ if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) ) || f->f_pmask[fac] == INTERNAL_NOPRI) continue; /* skip messages with the incorrect hostname */ if (skip_message(hostname, f->f_host, 0)) continue; /* skip messages with the incorrect program name */ if (flags & ISKERNEL && kernel_app_name[0] != '\0') { if (skip_message(kernel_app_name, f->f_program, 1)) continue; } else if (skip_message(app_name == NULL ? "" : app_name, f->f_program, 1)) continue; /* skip messages if a property does not match filter */ if (f->f_prop_filter != NULL && f->f_prop_filter->prop_type != PROP_TYPE_NOOP) { switch (f->f_prop_filter->prop_type) { case PROP_TYPE_MSG: if (evaluate_prop_filter(f->f_prop_filter, msg)) continue; break; case PROP_TYPE_HOSTNAME: if (evaluate_prop_filter(f->f_prop_filter, hostname)) continue; break; case PROP_TYPE_PROGNAME: if (evaluate_prop_filter(f->f_prop_filter, app_name == NULL ? "" : app_name)) continue; break; default: 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 && savedlen == f->f_prevlen && strcmp(saved, f->f_prevline) == 0) { f->f_lasttime = *timestamp; 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_successive(f, flags); BACKOFF(f); } } else { /* new line, save it */ if (f->f_prevcount) fprintlog_successive(f, 0); f->f_repeatcount = 0; f->f_prevpri = pri; f->f_lasttime = *timestamp; static_assert(sizeof(f->f_prevline) == sizeof(saved), "Space to store saved line incorrect"); (void)strcpy(f->f_prevline, saved); f->f_prevlen = savedlen; fprintlog_first(f, hostname, app_name, procid, msgid, structured_data, msg, flags); } } } static void dofsync(void) { struct filed *f; STAILQ_FOREACH(f, &fhead, next) { if ((f->f_type == F_FILE) && (f->f_flags & FFLAG_NEEDSYNC)) { f->f_flags &= ~FFLAG_NEEDSYNC; (void)fsync(f->f_file); } } } /* * List of iovecs to which entries can be appended. * Used for constructing the message to be logged. */ struct iovlist { struct iovec iov[TTYMSG_IOV_MAX]; size_t iovcnt; size_t totalsize; }; static void iovlist_init(struct iovlist *il) { il->iovcnt = 0; il->totalsize = 0; } static void iovlist_append(struct iovlist *il, const char *str) { size_t size; /* Discard components if we've run out of iovecs. */ if (il->iovcnt < nitems(il->iov)) { size = strlen(str); il->iov[il->iovcnt++] = (struct iovec){ .iov_base = __DECONST(char *, str), .iov_len = size, }; il->totalsize += size; } } #if defined(INET) || defined(INET6) static void iovlist_truncate(struct iovlist *il, size_t size) { struct iovec *last; size_t diff; while (il->totalsize > size) { diff = il->totalsize - size; last = &il->iov[il->iovcnt - 1]; if (diff >= last->iov_len) { /* Remove the last iovec entirely. */ --il->iovcnt; il->totalsize -= last->iov_len; } else { /* Remove the last iovec partially. */ last->iov_len -= diff; il->totalsize -= diff; } } } #endif static void fprintlog_write(struct filed *f, struct iovlist *il, int flags) { struct msghdr msghdr; struct addrinfo *r; struct socklist *sl; const char *msgret; ssize_t lsent; switch (f->f_type) { case F_FORW: dprintf(" %s", f->fu_forw_hname); switch (f->fu_forw_addr->ai_family) { #ifdef INET case AF_INET: dprintf(":%d\n", ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); break; #endif #ifdef INET6 case AF_INET6: dprintf(":%d\n", ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); break; #endif default: dprintf("\n"); } #if defined(INET) || defined(INET6) /* Truncate messages to maximum forward length. */ iovlist_truncate(il, MaxForwardLen); #endif lsent = 0; for (r = f->fu_forw_addr; r; r = r->ai_next) { memset(&msghdr, 0, sizeof(msghdr)); msghdr.msg_name = r->ai_addr; msghdr.msg_namelen = r->ai_addrlen; msghdr.msg_iov = il->iov; msghdr.msg_iovlen = il->iovcnt; STAILQ_FOREACH(sl, &shead, next) { if (sl->sl_socket < 0) continue; if (sl->sl_sa == NULL || sl->sl_family == AF_UNSPEC || sl->sl_family == AF_LOCAL) continue; lsent = sendmsg(sl->sl_socket, &msghdr, 0); if (lsent == (ssize_t)il->totalsize) break; } if (lsent == (ssize_t)il->totalsize && !send_to_all) break; } dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); if (lsent != (ssize_t)il->totalsize) { int e = errno; logerror("sendto"); errno = e; switch (errno) { case ENOBUFS: case ENETDOWN: case ENETUNREACH: case EHOSTUNREACH: case EHOSTDOWN: case EADDRNOTAVAIL: break; /* case EBADF: */ /* case EACCES: */ /* case ENOTSOCK: */ /* case EFAULT: */ /* case EMSGSIZE: */ /* case EAGAIN: */ /* case ENOBUFS: */ /* case ECONNREFUSED: */ default: dprintf("removing entry: errno=%d\n", e); f->f_type = F_UNUSED; break; } } break; case F_FILE: dprintf(" %s\n", f->fu_fname); iovlist_append(il, "\n"); if (writev(f->f_file, il->iov, il->iovcnt) < 0) { /* * If writev(2) fails for potentially transient errors * like the filesystem being full, ignore it. * Otherwise remove this logfile from the list. */ if (errno != ENOSPC) { int e = errno; close_filed(f); errno = e; logerror(f->fu_fname); } } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { f->f_flags |= FFLAG_NEEDSYNC; needdofsync = 1; } break; case F_PIPE: dprintf(" %s\n", f->fu_pipe_pname); iovlist_append(il, "\n"); if (f->fu_pipe_pid == 0) { if ((f->f_file = p_open(f->fu_pipe_pname, &f->fu_pipe_pid)) < 0) { logerror(f->fu_pipe_pname); break; } } if (writev(f->f_file, il->iov, il->iovcnt) < 0) { int e = errno; deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); close_filed(f); errno = e; logerror(f->fu_pipe_pname); } break; case F_CONSOLE: if (flags & IGN_CONS) { dprintf(" (ignored)\n"); break; } /* FALLTHROUGH */ case F_TTY: dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); iovlist_append(il, "\r\n"); errno = 0; /* ttymsg() only sometimes returns an errno */ if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) { f->f_type = F_UNUSED; logerror(msgret); } break; case F_USERS: case F_WALL: dprintf("\n"); iovlist_append(il, "\r\n"); wallmsg(f, il->iov, il->iovcnt); break; } } static void fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, const char *procid, const char *msgid, const char *structured_data, const char *msg, int flags) { struct iovlist il; suseconds_t usec; int i; char timebuf[33], priority_number[5]; iovlist_init(&il); if (f->f_type == F_WALL) iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); iovlist_append(&il, "<"); snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); iovlist_append(&il, priority_number); iovlist_append(&il, ">1 "); if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", &f->f_lasttime.tm) == sizeof(timebuf) - 2) { /* Add colon to the time zone offset, which %z doesn't do. */ timebuf[32] = '\0'; timebuf[31] = timebuf[30]; timebuf[30] = timebuf[29]; timebuf[29] = ':'; /* Overwrite space for microseconds with actual value. */ usec = f->f_lasttime.usec; for (i = 25; i >= 20; --i) { timebuf[i] = usec % 10 + '0'; usec /= 10; } iovlist_append(&il, timebuf); } else iovlist_append(&il, "-"); iovlist_append(&il, " "); iovlist_append(&il, hostname); iovlist_append(&il, " "); iovlist_append(&il, app_name == NULL ? "-" : app_name); iovlist_append(&il, " "); iovlist_append(&il, procid == NULL ? "-" : procid); iovlist_append(&il, " "); iovlist_append(&il, msgid == NULL ? "-" : msgid); iovlist_append(&il, " "); iovlist_append(&il, structured_data == NULL ? "-" : structured_data); iovlist_append(&il, " "); iovlist_append(&il, msg); fprintlog_write(f, &il, flags); } static void fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, const char *procid, const char *msg, int flags) { struct iovlist il; const CODE *c; int facility, priority; char timebuf[RFC3164_DATELEN + 1], facility_number[5], priority_number[5]; bool facility_found, priority_found; if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, &f->f_lasttime.tm) == 0) timebuf[0] = '\0'; iovlist_init(&il); switch (f->f_type) { case F_FORW: /* Message forwarded over the network. */ iovlist_append(&il, "<"); snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); iovlist_append(&il, priority_number); iovlist_append(&il, ">"); iovlist_append(&il, timebuf); if (strcasecmp(hostname, LocalHostName) != 0) { iovlist_append(&il, " Forwarded from "); iovlist_append(&il, hostname); iovlist_append(&il, ":"); } iovlist_append(&il, " "); break; case F_WALL: /* Message written to terminals. */ iovlist_append(&il, "\r\n\aMessage from syslogd@"); iovlist_append(&il, hostname); iovlist_append(&il, " at "); iovlist_append(&il, timebuf); iovlist_append(&il, " ...\r\n"); break; default: /* Message written to files. */ iovlist_append(&il, timebuf); iovlist_append(&il, " "); if (LogFacPri) { iovlist_append(&il, "<"); facility = f->f_prevpri & LOG_FACMASK; facility_found = false; if (LogFacPri > 1) { for (c = facilitynames; c->c_name; c++) { if (c->c_val == facility) { iovlist_append(&il, c->c_name); facility_found = true; break; } } } if (!facility_found) { snprintf(facility_number, sizeof(facility_number), "%d", LOG_FAC(facility)); iovlist_append(&il, facility_number); } iovlist_append(&il, "."); priority = LOG_PRI(f->f_prevpri); priority_found = false; if (LogFacPri > 1) { for (c = prioritynames; c->c_name; c++) { if (c->c_val == priority) { iovlist_append(&il, c->c_name); priority_found = true; break; } } } if (!priority_found) { snprintf(priority_number, sizeof(priority_number), "%d", priority); iovlist_append(&il, priority_number); } iovlist_append(&il, "> "); } iovlist_append(&il, hostname); iovlist_append(&il, " "); break; } /* Message body with application name and process ID prefixed. */ if (app_name != NULL) { iovlist_append(&il, app_name); if (procid != NULL) { iovlist_append(&il, "["); iovlist_append(&il, procid); iovlist_append(&il, "]"); } iovlist_append(&il, ": "); } iovlist_append(&il, msg); fprintlog_write(f, &il, flags); } static void fprintlog_first(struct filed *f, const char *hostname, const char *app_name, const char *procid, const char *msgid __unused, const char *structured_data __unused, const char *msg, int flags) { dprintf("Logging to %s", TypeNames[f->f_type]); f->f_time = now; f->f_prevcount = 0; if (f->f_type == F_UNUSED) { dprintf("\n"); return; } if (RFC3164OutputFormat) fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); else fprintlog_rfc5424(f, hostname, app_name, procid, msgid, structured_data, msg, flags); } /* * Prints a message to a log file that the previously logged message was * received multiple times. */ static void fprintlog_successive(struct filed *f, int flags) { char msg[100]; assert(f->f_prevcount > 0); snprintf(msg, sizeof(msg), "last message repeated %d times", f->f_prevcount); fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, flags); } /* * WALLMSG -- Write a message to the world at large * * Write the specified message to either the entire * world, or a list of approved users. */ static void wallmsg(struct filed *f, struct iovec *iov, const int iovlen) { static int reenter; /* avoid calling ourselves */ struct utmpx *ut; int i; const char *p; if (reenter++) return; setutxent(); /* NOSTRICT */ while ((ut = getutxent()) != NULL) { if (ut->ut_type != USER_PROCESS) continue; if (f->f_type == F_WALL) { if ((p = ttymsg(iov, iovlen, ut->ut_line, TTYMSGTIME)) != NULL) { errno = 0; /* already in msg */ logerror(p); } continue; } /* should we send the message to this user? */ for (i = 0; i < MAXUNAMES; i++) { if (!f->fu_uname[i][0]) break; if (!strcmp(f->fu_uname[i], ut->ut_user)) { if ((p = ttymsg_check(iov, iovlen, ut->ut_line, TTYMSGTIME)) != NULL) { errno = 0; /* already in msg */ logerror(p); } break; } } } endutxent(); reenter = 0; } /* * Wrapper routine for ttymsg() that checks the terminal for messages enabled. */ static const char * ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) { static char device[1024]; static char errbuf[1024]; struct stat sb; (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); if (stat(device, &sb) < 0) { (void) snprintf(errbuf, sizeof(errbuf), "%s: %s", device, strerror(errno)); return (errbuf); } if ((sb.st_mode & S_IWGRP) == 0) /* Messages disabled. */ return (NULL); return ttymsg(iov, iovcnt, line, tmout); } static void reapchild(int signo __unused) { int status; pid_t pid; struct filed *f; while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { /* First, look if it's a process from the dead queue. */ if (deadq_removebypid(pid)) continue; /* Now, look in list of active processes. */ STAILQ_FOREACH(f, &fhead, next) { if (f->f_type == F_PIPE && f->fu_pipe_pid == pid) { close_filed(f); log_deadchild(pid, status, f->fu_pipe_pname); break; } } } WantReapchild = 0; } /* * Return a printable representation of a host address. */ static const char * cvthname(struct sockaddr *f) { int error, hl; static char hname[NI_MAXHOST], ip[NI_MAXHOST]; dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); if (error) { dprintf("Malformed from address %s\n", gai_strerror(error)); return ("???"); } dprintf("cvthname(%s)\n", ip); if (!resolve) return (ip); error = getnameinfo(f, f->sa_len, hname, sizeof(hname), NULL, 0, NI_NAMEREQD); if (error) { dprintf("Host name for your address (%s) unknown\n", ip); return (ip); } hl = strlen(hname); if (hl > 0 && hname[hl-1] == '.') hname[--hl] = '\0'; /* RFC 5424 prefers logging FQDNs. */ if (RFC3164OutputFormat) 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 *msg) { 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 != 0) { (void)snprintf(buf, sizeof(buf), "%s: %s", msg, strerror(errno)); msg = buf; } errno = 0; dprintf("%s\n", buf); logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 0); recursed--; } static void die(int signo) { struct filed *f; struct socklist *sl; char buf[100]; STAILQ_FOREACH(f, &fhead, next) { /* flush any pending output */ if (f->f_prevcount) fprintlog_successive(f, 0); if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) close_filed(f); } if (signo) { dprintf("syslogd: exiting on signal %d\n", signo); (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); errno = 0; logerror(buf); } STAILQ_FOREACH(sl, &shead, next) { if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) unlink(sl->sl_peer->pe_name); } pidfile_remove(pfh); exit(1); } static int configfiles(const struct dirent *dp) { const char *p; size_t ext_len; if (dp->d_name[0] == '.') return (0); ext_len = sizeof(include_ext) -1; if (dp->d_namlen <= ext_len) return (0); p = &dp->d_name[dp->d_namlen - ext_len]; if (strcmp(p, include_ext) != 0) return (0); return (1); } static void readconfigfile(FILE *cf, int allow_includes) { FILE *cf2; struct filed *f; struct dirent **ent; char cline[LINE_MAX]; char host[MAXHOSTNAMELEN]; char prog[LINE_MAX]; char file[MAXPATHLEN]; char pfilter[LINE_MAX]; char *p, *tmp; int i, nents; size_t include_len; /* * Foreach line in the conf table, open that file. */ include_len = sizeof(include_str) -1; (void)strlcpy(host, "*", sizeof(host)); (void)strlcpy(prog, "*", sizeof(prog)); (void)strlcpy(pfilter, "*", sizeof(pfilter)); while (fgets(cline, sizeof(cline), cf) != NULL) { /* * check for end-of-section, comments, strip off trailing * spaces and newline character. #!prog is treated specially: * following lines apply only to that program. */ for (p = cline; isspace(*p); ++p) continue; if (*p == 0) continue; if (allow_includes && strncmp(p, include_str, include_len) == 0 && isspace(p[include_len])) { p += include_len; while (isspace(*p)) p++; tmp = p; while (*tmp != '\0' && !isspace(*tmp)) tmp++; *tmp = '\0'; dprintf("Trying to include files in '%s'\n", p); nents = scandir(p, &ent, configfiles, alphasort); if (nents == -1) { dprintf("Unable to open '%s': %s\n", p, strerror(errno)); continue; } for (i = 0; i < nents; i++) { if (snprintf(file, sizeof(file), "%s/%s", p, ent[i]->d_name) >= (int)sizeof(file)) { dprintf("ignoring path too long: " "'%s/%s'\n", p, ent[i]->d_name); free(ent[i]); continue; } free(ent[i]); cf2 = fopen(file, "r"); if (cf2 == NULL) continue; dprintf("reading %s\n", file); readconfigfile(cf2, 0); fclose(cf2); } free(ent); continue; } if (*p == '#') { p++; if (*p == '\0' || strchr("!+-:", *p) == NULL) 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; } if (*p == ':') { p++; while (isspace(*p)) p++; if ((!*p) || (*p == '*')) { (void)strlcpy(pfilter, "*", sizeof(pfilter)); continue; } (void)strlcpy(pfilter, p, sizeof(pfilter)); continue; } for (p = cline + 1; *p != '\0'; p++) { if (*p != '#') continue; if (*(p - 1) == '\\') { strcpy(p - 1, p); p--; continue; } *p = '\0'; break; } for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) cline[i] = '\0'; f = cfline(cline, prog, host, pfilter); if (f != NULL) addfile(f); free(f); } } static void sighandler(int signo) { /* Send an wake-up signal to the select() loop. */ write(sigpipe[1], &signo, sizeof(signo)); } /* * INIT -- Initialize syslogd from configuration table */ static void init(int signo) { int i; FILE *cf; struct filed *f; char *p; char oldLocalHostName[MAXHOSTNAMELEN]; char hostMsg[2*MAXHOSTNAMELEN+40]; char bootfileMsg[MAXLINE + 1]; dprintf("init\n"); WantInitialize = 0; /* * Load hostname (may have changed). */ if (signo != 0) (void)strlcpy(oldLocalHostName, LocalHostName, sizeof(oldLocalHostName)); if (gethostname(LocalHostName, sizeof(LocalHostName))) err(EX_OSERR, "gethostname() failed"); if ((p = strchr(LocalHostName, '.')) != NULL) { /* RFC 5424 prefers logging FQDNs. */ if (RFC3164OutputFormat) *p = '\0'; LocalDomain = p + 1; } else { LocalDomain = ""; } /* * Load / reload timezone data (in case it changed). * * Just calling tzset() again does not work, the timezone code * caches the result. However, by setting the TZ variable, one * can defeat the caching and have the timezone code really * reload the timezone data. Respect any initial setting of * TZ, in case the system is configured specially. */ dprintf("loading timezone data via tzset()\n"); if (getenv("TZ")) { tzset(); } else { setenv("TZ", ":/etc/localtime", 1); tzset(); unsetenv("TZ"); } /* * Close all open log files. */ Initialized = 0; STAILQ_FOREACH(f, &fhead, next) { /* flush any pending output */ if (f->f_prevcount) fprintlog_successive(f, 0); switch (f->f_type) { case F_FILE: case F_FORW: case F_CONSOLE: case F_TTY: close_filed(f); break; case F_PIPE: deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); close_filed(f); break; } } while(!STAILQ_EMPTY(&fhead)) { f = STAILQ_FIRST(&fhead); STAILQ_REMOVE_HEAD(&fhead, next); free(f->f_program); free(f->f_host); if (f->f_prop_filter) { switch (f->f_prop_filter->cmp_type) { case PROP_CMP_REGEX: regfree(f->f_prop_filter->pflt_re); free(f->f_prop_filter->pflt_re); break; case PROP_CMP_CONTAINS: case PROP_CMP_EQUAL: case PROP_CMP_STARTS: free(f->f_prop_filter->pflt_strval); break; } free(f->f_prop_filter); } free(f); } /* open the configuration file */ if ((cf = fopen(ConfFile, "r")) == NULL) { dprintf("cannot open %s\n", ConfFile); f = cfline("*.ERR\t/dev/console", "*", "*", "*"); if (f != NULL) addfile(f); free(f); f = cfline("*.PANIC\t*", "*", "*", "*"); if (f != NULL) addfile(f); free(f); Initialized = 1; return; } readconfigfile(cf, 1); /* close the configuration file */ (void)fclose(cf); Initialized = 1; if (Debug) { int port; STAILQ_FOREACH(f, &fhead, next) { for (i = 0; i <= LOG_NFACILITIES; i++) if (f->f_pmask[i] == INTERNAL_NOPRI) printf("X "); else printf("%d ", f->f_pmask[i]); printf("%s: ", TypeNames[f->f_type]); switch (f->f_type) { case F_FILE: printf("%s", f->fu_fname); break; case F_CONSOLE: case F_TTY: printf("%s%s", _PATH_DEV, f->fu_fname); break; case F_FORW: switch (f->fu_forw_addr->ai_family) { #ifdef INET case AF_INET: port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); break; #endif #ifdef INET6 case AF_INET6: port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); break; #endif default: port = 0; } if (port != 514) { printf("%s:%d", f->fu_forw_hname, port); } else { printf("%s", f->fu_forw_hname); } break; case F_PIPE: printf("%s", f->fu_pipe_pname); break; case F_USERS: for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) printf("%s, ", f->fu_uname[i]); break; } if (f->f_program) printf(" (%s)", f->f_program); printf("\n"); } } logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, NULL, NULL, "restart", 0); 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), "hostname changed, \"%s\" to \"%s\"", oldLocalHostName, LocalHostName); logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, NULL, NULL, hostMsg, 0); 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), "kernel boot file is %s", bootfile); logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, NULL, NULL, bootfileMsg, 0); dprintf("%s\n", bootfileMsg); } } /* * Compile property-based filter. * Returns 0 on success, -1 otherwise. */ static int prop_filter_compile(struct prop_filter *pfilter, char *filter) { char *filter_endpos, *p; char **ap, *argv[2] = {NULL, NULL}; int re_flags = REG_NOSUB; int escaped; bzero(pfilter, sizeof(struct prop_filter)); /* * Here's some filter examples mentioned in syslog.conf(5) * 'msg, contains, ".*Deny.*"' * 'programname, regex, "^bird6?$"' * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"' */ /* * Split filter into 3 parts: property name (argv[0]), * cmp type (argv[1]) and lvalue for comparison (filter). */ for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) { if (**ap != '\0') if (++ap >= &argv[2]) break; } if (argv[0] == NULL || argv[1] == NULL) { logerror("filter parse error"); return (-1); } /* fill in prop_type */ if (strcasecmp(argv[0], "msg") == 0) pfilter->prop_type = PROP_TYPE_MSG; else if(strcasecmp(argv[0], "hostname") == 0) pfilter->prop_type = PROP_TYPE_HOSTNAME; else if(strcasecmp(argv[0], "source") == 0) pfilter->prop_type = PROP_TYPE_HOSTNAME; else if(strcasecmp(argv[0], "programname") == 0) pfilter->prop_type = PROP_TYPE_PROGNAME; else { logerror("unknown property"); return (-1); } /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ if (*argv[1] == '!') { pfilter->cmp_flags |= PROP_FLAG_EXCLUDE; argv[1]++; } if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { pfilter->cmp_flags |= PROP_FLAG_ICASE; argv[1] += sizeof("icase_") - 1; } /* fill in cmp_type */ if (strcasecmp(argv[1], "contains") == 0) pfilter->cmp_type = PROP_CMP_CONTAINS; else if (strcasecmp(argv[1], "isequal") == 0) pfilter->cmp_type = PROP_CMP_EQUAL; else if (strcasecmp(argv[1], "startswith") == 0) pfilter->cmp_type = PROP_CMP_STARTS; else if (strcasecmp(argv[1], "regex") == 0) pfilter->cmp_type = PROP_CMP_REGEX; else if (strcasecmp(argv[1], "ereregex") == 0) { pfilter->cmp_type = PROP_CMP_REGEX; re_flags |= REG_EXTENDED; } else { logerror("unknown cmp function"); return (-1); } /* * Handle filter value */ /* ' ".*Deny.*"' */ /* remove leading whitespace and check for '"' next character */ filter += strspn(filter, ", \t\n"); if (*filter != '"' || strlen(filter) < 3) { logerror("property value parse error"); return (-1); } filter++; /* '.*Deny.*"' */ /* process possible backslash (\") escaping */ escaped = 0; filter_endpos = filter; for (p = filter; *p != '\0'; p++) { if (*p == '\\' && !escaped) { escaped = 1; /* do not shift filter_endpos */ continue; } if (*p == '"' && !escaped) { p++; break; } /* we've seen some esc symbols, need to compress the line */ if (filter_endpos != p) *filter_endpos = *p; filter_endpos++; escaped = 0; } *filter_endpos = '\0'; /* '.*Deny.*' */ /* We should not have anything but whitespace left after closing '"' */ if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) { logerror("property value parse error"); return (-1); } if (pfilter->cmp_type == PROP_CMP_REGEX) { pfilter->pflt_re = calloc(1, sizeof(*pfilter->pflt_re)); if (pfilter->pflt_re == NULL) { logerror("RE calloc() error"); free(pfilter->pflt_re); return (-1); } if (pfilter->cmp_flags & PROP_FLAG_ICASE) re_flags |= REG_ICASE; if (regcomp(pfilter->pflt_re, filter, re_flags) != 0) { logerror("RE compilation error"); free(pfilter->pflt_re); return (-1); } } else { pfilter->pflt_strval = strdup(filter); pfilter->pflt_strlen = strlen(filter); } return (0); } /* * Crack a configuration file line */ static struct filed * cfline(const char *line, const char *prog, const char *host, const char *pfilter) { struct filed *f; struct addrinfo hints, *res; int error, i, pri, syncfile; const char *p, *q; char *bp, *pfilter_dup; char buf[LINE_MAX], ebuf[100]; dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, host, pfilter); f = calloc(1, sizeof(*f)); if (f == NULL) { logerror("malloc"); exit(1); } errno = 0; /* keep strerror() stuff out of logerror messages */ for (i = 0; i <= LOG_NFACILITIES; i++) f->f_pmask[i] = INTERNAL_NOPRI; /* save hostname if any */ if (host && *host == '*') host = NULL; if (host) { int hl; f->f_host = strdup(host); if (f->f_host == NULL) { logerror("strdup"); exit(1); } hl = strlen(f->f_host); if (hl > 0 && f->f_host[hl-1] == '.') f->f_host[--hl] = '\0'; /* RFC 5424 prefers logging FQDNs. */ if (RFC3164OutputFormat) 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); } } if (pfilter) { f->f_prop_filter = calloc(1, sizeof(*(f->f_prop_filter))); if (f->f_prop_filter == NULL) { logerror("pfilter calloc"); exit(1); } if (*pfilter == '*') f->f_prop_filter->prop_type = PROP_TYPE_NOOP; else { pfilter_dup = strdup(pfilter); if (pfilter_dup == NULL) { logerror("strdup"); exit(1); } if (prop_filter_compile(f->f_prop_filter, pfilter_dup)) { logerror("filter compile error"); exit(1); } } } /* scan through the list of selectors */ for (p = line; *p && *p != '\t' && *p != ' ';) { int pri_done; int pri_cmp; int pri_invert; /* find the end of this facility name list */ for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) continue; /* get the priority comparison */ pri_cmp = 0; pri_done = 0; pri_invert = 0; if (*q == '!') { pri_invert = 1; q++; } while (!pri_done) { switch (*q) { case '<': pri_cmp |= PRI_LT; q++; break; case '=': pri_cmp |= PRI_EQ; q++; break; case '>': pri_cmp |= PRI_GT; q++; break; default: pri_done++; break; } } /* collect priority name */ for (bp = buf; *q && !strchr("\t,; ", *q); ) *bp++ = *q++; *bp = '\0'; /* skip cruft */ while (strchr(",;", *q)) q++; /* decode priority name */ if (*buf == '*') { pri = LOG_PRIMASK; pri_cmp = PRI_LT | PRI_EQ | PRI_GT; } else { /* Ignore trailing spaces. */ for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) buf[i] = '\0'; pri = decode(buf, prioritynames); if (pri < 0) { errno = 0; (void)snprintf(ebuf, sizeof ebuf, "unknown priority name \"%s\"", buf); logerror(ebuf); free(f); return (NULL); } } if (!pri_cmp) pri_cmp = (UniquePriority) ? (PRI_EQ) : (PRI_EQ | PRI_GT) ; if (pri_invert) pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; /* scan facilities */ while (*p && !strchr("\t.; ", *p)) { for (bp = buf; *p && !strchr("\t,;. ", *p); ) *bp++ = *p++; *bp = '\0'; if (*buf == '*') { for (i = 0; i < LOG_NFACILITIES; i++) { f->f_pmask[i] = pri; f->f_pcmp[i] = pri_cmp; } } else { i = decode(buf, facilitynames); if (i < 0) { errno = 0; (void)snprintf(ebuf, sizeof ebuf, "unknown facility name \"%s\"", buf); logerror(ebuf); free(f); return (NULL); } f->f_pmask[i >> 3] = pri; f->f_pcmp[i >> 3] = pri_cmp; } while (*p == ',' || *p == ' ') p++; } p = q; } /* skip to action part */ while (*p == '\t' || *p == ' ') p++; if (*p == '-') { syncfile = 0; p++; } else syncfile = 1; switch (*p) { case '@': { char *tp; char endkey = ':'; /* * scan forward to see if there is a port defined. * so we can't use strlcpy.. */ i = sizeof(f->fu_forw_hname); tp = f->fu_forw_hname; p++; /* * an ipv6 address should start with a '[' in that case * we should scan for a ']' */ if (*p == '[') { p++; endkey = ']'; } while (*p && (*p != endkey) && (i-- > 0)) { *tp++ = *p++; } if (endkey == ']' && *p == endkey) p++; *tp = '\0'; } /* See if we copied a domain and have a port */ if (*p == ':') p++; else p = NULL; hints = (struct addrinfo){ .ai_family = family, .ai_socktype = SOCK_DGRAM }; error = getaddrinfo(f->fu_forw_hname, p ? p : "syslog", &hints, &res); if (error) { logerror(gai_strerror(error)); break; } f->fu_forw_addr = res; f->f_type = F_FORW; break; case '/': if ((f->f_file = open(p, logflags, 0600)) < 0) { f->f_type = F_UNUSED; logerror(p); break; } if (syncfile) f->f_flags |= FFLAG_SYNC; if (isatty(f->f_file)) { if (strcmp(p, ctty) == 0) f->f_type = F_CONSOLE; else f->f_type = F_TTY; (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, sizeof(f->fu_fname)); } else { (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); f->f_type = F_FILE; } break; case '|': f->fu_pipe_pid = 0; (void)strlcpy(f->fu_pipe_pname, p + 1, sizeof(f->fu_pipe_pname)); f->f_type = F_PIPE; break; case '*': f->f_type = F_WALL; break; default: for (i = 0; i < MAXUNAMES && *p; i++) { for (q = p; *q && *q != ','; ) q++; (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); if ((q - p) >= MAXLOGNAME) f->fu_uname[i][MAXLOGNAME - 1] = '\0'; else f->fu_uname[i][q - p] = '\0'; while (*q == ',' || *q == ' ') q++; p = q; } f->f_type = F_USERS; break; } return (f); } /* * Decode a symbolic name to a numeric value */ static int decode(const char *name, const CODE *codetab) { const CODE *c; char *p, buf[40]; if (isdigit(*name)) return (atoi(name)); for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { if (isupper(*name)) *p = tolower(*name); else *p = *name; } *p = '\0'; for (c = codetab; c->c_name; c++) if (!strcmp(buf, c->c_name)) return (c->c_val); return (-1); } static void markit(void) { struct filed *f; struct deadq_entry *dq, *dq0; now = time((time_t *)NULL); MarkSeq += TIMERINTVL; if (MarkSeq >= MarkInterval) { logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, "-- MARK --", MARK); MarkSeq = 0; } STAILQ_FOREACH(f, &fhead, next) { if (f->f_prevcount && now >= REPEATTIME(f)) { dprintf("flush %s: repeated %d times, %d sec.\n", TypeNames[f->f_type], f->f_prevcount, repeatinterval[f->f_repeatcount]); fprintlog_successive(f, 0); BACKOFF(f); } } /* Walk the dead queue, and see if we should signal somebody. */ TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { switch (dq->dq_timeout) { case 0: /* Already signalled once, try harder now. */ if (kill(dq->dq_pid, SIGKILL) != 0) (void)deadq_remove(dq); break; case 1: /* * Timed out on dead queue, send terminate * signal. Note that we leave the removal * from the dead queue to reapchild(), which * will also log the event (unless the process * didn't even really exist, in case we simply * drop it from the dead queue). */ if (kill(dq->dq_pid, SIGTERM) != 0) (void)deadq_remove(dq); else dq->dq_timeout--; break; default: dq->dq_timeout--; } } MarkSet = 0; (void)alarm(TIMERINTVL); } /* * fork off and become a daemon, but wait for the child to come online * before returning to the parent, or we get disk thrashing at boot etc. * Set a timer so we don't hang forever if it wedges. */ static int waitdaemon(int maxwait) { int fd; int status; pid_t pid, childpid; switch (childpid = fork()) { case -1: return (-1); case 0: break; default: signal(SIGALRM, timedout); alarm(maxwait); while ((pid = wait3(&status, 0, NULL)) != -1) { if (WIFEXITED(status)) errx(1, "child pid %d exited with return code %d", pid, WEXITSTATUS(status)); if (WIFSIGNALED(status)) errx(1, "child pid %d exited on signal %d%s", pid, WTERMSIG(status), WCOREDUMP(status) ? " (core dumped)" : ""); if (pid == childpid) /* it's gone... */ break; } exit(0); } if (setsid() == -1) return (-1); (void)chdir("/"); if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { (void)dup2(fd, STDIN_FILENO); (void)dup2(fd, STDOUT_FILENO); (void)dup2(fd, STDERR_FILENO); if (fd > STDERR_FILENO) (void)close(fd); } return (getppid()); } /* * We get a SIGALRM from the child when it's running and finished doing it's * fsync()'s or O_SYNC writes for all the boot messages. * * We also get a signal from the kernel if the timer expires, so check to * see what happened. */ static void timedout(int sig __unused) { int left; left = alarm(0); signal(SIGALRM, SIG_DFL); if (left == 0) errx(1, "timed out waiting for child"); else _exit(0); } /* * Add `s' to the list of allowable peer addresses to accept messages * from. * * `s' is a string in the form: * * [*]domainname[:{servicename|portnumber|*}] * * or * * netaddr/maskbits[:{servicename|portnumber|*}] * * Returns -1 on error, 0 if the argument was valid. */ static int #if defined(INET) || defined(INET6) allowaddr(char *s) #else allowaddr(char *s __unused) #endif { #if defined(INET) || defined(INET6) char *cp1, *cp2; struct allowedpeer *ap; struct servent *se; int masklen = -1; struct addrinfo hints, *res = NULL; #ifdef INET in_addr_t *addrp, *maskp; #endif #ifdef INET6 uint32_t *addr6p, *mask6p; #endif char ip[NI_MAXHOST]; ap = calloc(1, sizeof(*ap)); if (ap == NULL) err(1, "malloc failed"); #ifdef INET6 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) #endif cp1 = s; if ((cp1 = strrchr(cp1, ':'))) { /* service/port provided */ *cp1++ = '\0'; if (strlen(cp1) == 1 && *cp1 == '*') /* any port allowed */ ap->port = 0; else if ((se = getservbyname(cp1, "udp"))) { ap->port = ntohs(se->s_port); } else { ap->port = strtol(cp1, &cp2, 0); /* port not numeric */ if (*cp2 != '\0') goto err; } } else { if ((se = getservbyname("syslog", "udp"))) ap->port = ntohs(se->s_port); else /* sanity, should not happen */ ap->port = 514; } if ((cp1 = strchr(s, '/')) != NULL && strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { *cp1 = '\0'; if ((masklen = atoi(cp1 + 1)) < 0) goto err; } #ifdef INET6 if (*s == '[') { cp2 = s + strlen(s) - 1; if (*cp2 == ']') { ++s; *cp2 = '\0'; } else { cp2 = NULL; } } else { cp2 = NULL; } #endif hints = (struct addrinfo){ .ai_family = PF_UNSPEC, .ai_socktype = SOCK_DGRAM, .ai_flags = AI_PASSIVE | AI_NUMERICHOST }; if (getaddrinfo(s, NULL, &hints, &res) == 0) { ap->isnumeric = 1; memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); ap->a_mask = (struct sockaddr_storage){ .ss_family = res->ai_family, .ss_len = res->ai_addrlen }; switch (res->ai_family) { #ifdef INET case AF_INET: maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; if (masklen < 0) { /* use default netmask */ if (IN_CLASSA(ntohl(*addrp))) *maskp = htonl(IN_CLASSA_NET); else if (IN_CLASSB(ntohl(*addrp))) *maskp = htonl(IN_CLASSB_NET); else *maskp = htonl(IN_CLASSC_NET); } else if (masklen == 0) { *maskp = 0; } else if (masklen <= 32) { /* convert masklen to netmask */ *maskp = htonl(~((1 << (32 - masklen)) - 1)); } else { goto err; } /* Lose any host bits in the network number. */ *addrp &= *maskp; break; #endif #ifdef INET6 case AF_INET6: if (masklen > 128) goto err; if (masklen < 0) masklen = 128; mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; /* convert masklen to netmask */ while (masklen > 0) { if (masklen < 32) { *mask6p = htonl(~(0xffffffff >> masklen)); *addr6p &= *mask6p; break; } else { *mask6p++ = 0xffffffff; addr6p++; masklen -= 32; } } break; #endif default: goto err; } freeaddrinfo(res); } else { /* arg `s' is domain name */ ap->isnumeric = 0; ap->a_name = s; if (cp1) *cp1 = '/'; #ifdef INET6 if (cp2) { *cp2 = ']'; --s; } #endif } STAILQ_INSERT_TAIL(&aphead, ap, next); if (Debug) { printf("allowaddr: rule "); if (ap->isnumeric) { printf("numeric, "); getnameinfo(sstosa(&ap->a_addr), (sstosa(&ap->a_addr))->sa_len, ip, sizeof ip, NULL, 0, NI_NUMERICHOST); printf("addr = %s, ", ip); getnameinfo(sstosa(&ap->a_mask), (sstosa(&ap->a_mask))->sa_len, ip, sizeof ip, NULL, 0, NI_NUMERICHOST); printf("mask = %s; ", ip); } else { printf("domainname = %s; ", ap->a_name); } printf("port = %d\n", ap->port); } return (0); err: if (res != NULL) freeaddrinfo(res); free(ap); #endif return (-1); } /* * Validate that the remote peer has permission to log to us. */ static int validate(struct sockaddr *sa, const char *hname) { int i; char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; struct allowedpeer *ap; #ifdef INET struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; #endif #ifdef INET6 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; #endif struct addrinfo hints, *res; u_short sport; int num = 0; STAILQ_FOREACH(ap, &aphead, next) { num++; } dprintf("# of validation rule: %d\n", num); if (num == 0) /* traditional behaviour, allow everything */ return (1); (void)strlcpy(name, hname, sizeof(name)); hints = (struct addrinfo){ .ai_family = PF_UNSPEC, .ai_socktype = SOCK_DGRAM, .ai_flags = AI_PASSIVE | AI_NUMERICHOST }; if (getaddrinfo(name, NULL, &hints, &res) == 0) freeaddrinfo(res); else if (strchr(name, '.') == NULL) { strlcat(name, ".", sizeof name); strlcat(name, LocalDomain, sizeof name); } if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV) != 0) return (0); /* for safety, should not occur */ dprintf("validate: dgram from IP %s, port %s, name %s;\n", ip, port, name); sport = atoi(port); /* now, walk down the list */ i = 0; STAILQ_FOREACH(ap, &aphead, next) { i++; if (ap->port != 0 && ap->port != sport) { dprintf("rejected in rule %d due to port mismatch.\n", i); continue; } if (ap->isnumeric) { if (ap->a_addr.ss_family != sa->sa_family) { dprintf("rejected in rule %d due to address family mismatch.\n", i); continue; } #ifdef INET else if (ap->a_addr.ss_family == AF_INET) { sin4 = satosin(sa); a4p = satosin(&ap->a_addr); m4p = satosin(&ap->a_mask); if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) != a4p->sin_addr.s_addr) { dprintf("rejected in rule %d due to IP mismatch.\n", i); continue; } } #endif #ifdef INET6 else if (ap->a_addr.ss_family == AF_INET6) { sin6 = satosin6(sa); a6p = satosin6(&ap->a_addr); m6p = satosin6(&ap->a_mask); if (a6p->sin6_scope_id != 0 && sin6->sin6_scope_id != a6p->sin6_scope_id) { dprintf("rejected in rule %d due to scope mismatch.\n", i); continue; } if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, &a6p->sin6_addr, &m6p->sin6_addr)) { dprintf("rejected in rule %d due to IP mismatch.\n", i); continue; } } #endif else continue; } else { if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == FNM_NOMATCH) { dprintf("rejected in rule %d due to name " "mismatch.\n", i); continue; } } dprintf("accepted in rule %d.\n", i); return (1); /* hooray! */ } return (0); } /* * Fairly similar to popen(3), but returns an open descriptor, as * opposed to a FILE *. */ static int p_open(const char *prog, pid_t *rpid) { int pfd[2], nulldesc; pid_t pid; char *argv[4]; /* sh -c cmd NULL */ char errmsg[200]; if (pipe(pfd) == -1) return (-1); if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) /* we are royally screwed anyway */ return (-1); switch ((pid = fork())) { case -1: close(nulldesc); return (-1); case 0: (void)setsid(); /* Avoid catching SIGHUPs. */ argv[0] = strdup("sh"); argv[1] = strdup("-c"); argv[2] = strdup(prog); argv[3] = NULL; if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { logerror("strdup"); exit(1); } alarm(0); /* Restore signals marked as SIG_IGN. */ (void)signal(SIGINT, SIG_DFL); (void)signal(SIGQUIT, SIG_DFL); (void)signal(SIGPIPE, SIG_DFL); dup2(pfd[0], STDIN_FILENO); dup2(nulldesc, STDOUT_FILENO); dup2(nulldesc, STDERR_FILENO); closefrom(STDERR_FILENO + 1); (void)execvp(_PATH_BSHELL, argv); _exit(255); } close(nulldesc); close(pfd[0]); /* * Avoid blocking on a hung pipe. With O_NONBLOCK, we are * supposed to get an EWOULDBLOCK on writev(2), which is * caught by the logic above anyway, which will in turn close * the pipe, and fork a new logging subprocess if necessary. * The stale subprocess will be killed some time later unless * it terminated itself due to closing its input pipe (so we * get rid of really dead puppies). */ if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { /* This is bad. */ (void)snprintf(errmsg, sizeof errmsg, "Warning: cannot change pipe to PID %d to " "non-blocking behaviour.", (int)pid); logerror(errmsg); } *rpid = pid; return (pfd[1]); } static void deadq_enter(pid_t pid, const char *name) { struct deadq_entry *dq; int status; if (pid == 0) return; /* * Be paranoid, if we can't signal the process, don't enter it * into the dead queue (perhaps it's already dead). If possible, * we try to fetch and log the child's status. */ if (kill(pid, 0) != 0) { if (waitpid(pid, &status, WNOHANG) > 0) log_deadchild(pid, status, name); return; } dq = malloc(sizeof(*dq)); if (dq == NULL) { logerror("malloc"); exit(1); } *dq = (struct deadq_entry){ .dq_pid = pid, .dq_timeout = DQ_TIMO_INIT }; TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); } static int deadq_remove(struct deadq_entry *dq) { if (dq != NULL) { TAILQ_REMOVE(&deadq_head, dq, dq_entries); free(dq); return (1); } return (0); } static int deadq_removebypid(pid_t pid) { struct deadq_entry *dq; TAILQ_FOREACH(dq, &deadq_head, dq_entries) { if (dq->dq_pid == pid) break; } return (deadq_remove(dq)); } static void log_deadchild(pid_t pid, int status, const char *name) { int code; char buf[256]; const char *reason; errno = 0; /* Keep strerror() stuff out of logerror messages. */ if (WIFSIGNALED(status)) { reason = "due to signal"; code = WTERMSIG(status); } else { reason = "with status"; code = WEXITSTATUS(status); if (code == 0) return; } (void)snprintf(buf, sizeof buf, "Logging subprocess %d (%s) exited %s %d.", pid, name, reason, code); logerror(buf); } static int socksetup(struct peer *pe) { struct addrinfo hints, *res, *res0; int error; char *cp; int (*sl_recv)(struct socklist *); /* * We have to handle this case for backwards compatibility: * If there are two (or more) colons but no '[' and ']', * assume this is an inet6 address without a service. */ if (pe->pe_name != NULL) { #ifdef INET6 if (pe->pe_name[0] == '[' && (cp = strchr(pe->pe_name + 1, ']')) != NULL) { pe->pe_name = &pe->pe_name[1]; *cp = '\0'; if (cp[1] == ':' && cp[2] != '\0') pe->pe_serv = cp + 2; } else { #endif cp = strchr(pe->pe_name, ':'); if (cp != NULL && strchr(cp + 1, ':') == NULL) { *cp = '\0'; if (cp[1] != '\0') pe->pe_serv = cp + 1; if (cp == pe->pe_name) pe->pe_name = NULL; } #ifdef INET6 } #endif } hints = (struct addrinfo){ .ai_family = AF_UNSPEC, .ai_socktype = SOCK_DGRAM, .ai_flags = AI_PASSIVE }; if (pe->pe_name != NULL) dprintf("Trying peer: %s\n", pe->pe_name); if (pe->pe_serv == NULL) pe->pe_serv = "syslog"; error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); if (error) { char *msgbuf; asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, gai_strerror(error)); errno = 0; if (msgbuf == NULL) logerror(gai_strerror(error)); else logerror(msgbuf); free(msgbuf); die(0); } for (res = res0; res != NULL; res = res->ai_next) { int s; if (res->ai_family != AF_LOCAL && SecureMode > 1) { /* Only AF_LOCAL in secure mode. */ continue; } if (family != AF_UNSPEC && res->ai_family != AF_LOCAL && res->ai_family != family) continue; s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); if (s < 0) { logerror("socket"); error++; continue; } #ifdef INET6 if (res->ai_family == AF_INET6) { if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &(int){1}, sizeof(int)) < 0) { logerror("setsockopt(IPV6_V6ONLY)"); close(s); error++; continue; } } #endif if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int)) < 0) { logerror("setsockopt(SO_REUSEADDR)"); close(s); error++; continue; } /* * Bind INET and UNIX-domain sockets. * * A UNIX-domain socket is always bound to a pathname * regardless of -N flag. * * For INET sockets, RFC 3164 recommends that client * side message should come from the privileged syslogd port. * * If the system administrator chooses not to obey * this, we can skip the bind() step so that the * system will choose a port for us. */ if (res->ai_family == AF_LOCAL) unlink(pe->pe_name); if (res->ai_family == AF_LOCAL || NoBind == 0 || pe->pe_name != NULL) { if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { logerror("bind"); close(s); error++; continue; } if (res->ai_family == AF_LOCAL || SecureMode == 0) increase_rcvbuf(s); } if (res->ai_family == AF_LOCAL && chmod(pe->pe_name, pe->pe_mode) < 0) { dprintf("chmod %s: %s\n", pe->pe_name, strerror(errno)); close(s); error++; continue; } dprintf("new socket fd is %d\n", s); if (res->ai_socktype != SOCK_DGRAM) { listen(s, 5); } sl_recv = socklist_recv_sock; #if defined(INET) || defined(INET6) if (SecureMode && (res->ai_family == AF_INET || res->ai_family == AF_INET6)) { dprintf("shutdown\n"); /* Forbid communication in secure mode. */ if (shutdown(s, SHUT_RD) < 0 && errno != ENOTCONN) { logerror("shutdown"); if (!Debug) die(0); } sl_recv = NULL; } else #endif dprintf("listening on socket\n"); dprintf("sending on socket\n"); addsock(res, &(struct socklist){ .sl_socket = s, .sl_peer = pe, .sl_recv = sl_recv }); } freeaddrinfo(res0); return(error); } static void increase_rcvbuf(int fd) { socklen_t len; if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &(socklen_t){sizeof(len)}) == 0) { if (len < RCVBUF_MINSIZE) { len = RCVBUF_MINSIZE; setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); } } }