/* $OpenBSD: syslogd.c,v 1.140 2015/01/08 20:22:47 bluhm Exp $ */ /* * Copyright (c) 1983, 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * syslogd -- log system messages * * This program implements a system log. It takes a series of lines. * Each line may have a priority, signified as "" as * the first characters of the line. If this is * not present, a default priority is used. * * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will * cause it to reread its configuration file. * * Defined Constants: * * MAXLINE -- the maximum line length that can be handled. * DEFUPRI -- the default priority for user messages * DEFSPRI -- the default priority for kernel messages * * Author: Eric Allman * extensive changes by Ralph Campbell * more extensive changes by Eric Allman (again) * memory buffer logging by Damien Miller * IPv6, libevent, sending via TCP by Alexander Bluhm */ #define MAXLINE 1024 /* maximum line length */ #define MIN_MEMBUF (MAXLINE * 4) /* Minimum memory buffer size */ #define MAX_MEMBUF (256 * 1024) /* Maximum memory buffer size */ #define MAX_MEMBUF_NAME 64 /* Max length of membuf log name */ #define MAX_TCPBUF (256 * 1024) /* Maximum tcp event buffer size */ #define MAXSVLINE 120 /* maximum saved line length */ #define DEFUPRI (LOG_USER|LOG_NOTICE) #define DEFSPRI (LOG_KERN|LOG_CRIT) #define TIMERINTVL 30 /* interval for checking flush, mark */ #define TTYMSGTIME 1 /* timeout passed to ttymsg */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define SYSLOG_NAMES #include #include "syslogd.h" char *ConfFile = _PATH_LOGCONF; const char ctty[] = _PATH_CONSOLE; #define MAXUNAMES 20 /* maximum number of user names */ /* * Flags to logmsg(). */ #define IGN_CONS 0x001 /* don't print on console */ #define SYNC_FILE 0x002 /* do fsync on file after printing */ #define ADDDATE 0x004 /* add a date to the message */ #define MARK 0x008 /* this message is a mark */ /* * This structure represents the files that will have log * copies printed. */ struct filed { SIMPLEQ_ENTRY(filed) f_next; /* next in linked list */ int f_type; /* entry type, see below */ int f_file; /* file descriptor */ time_t f_time; /* time this was last written */ u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ char *f_program; /* program this applies to */ union { char f_uname[MAXUNAMES][UT_NAMESIZE+1]; struct { char f_loghost[1+4+3+1+MAXHOSTNAMELEN+1+NI_MAXSERV]; /* @proto46://[hostname]:servname\0 */ struct sockaddr_storage f_addr; struct bufferevent *f_bufev; } f_forw; /* forwarding address */ char f_fname[MAXPATHLEN]; struct { char f_mname[MAX_MEMBUF_NAME]; struct ringbuf *f_rb; int f_overflow; int f_attached; size_t f_len; } f_mb; /* Memory buffer */ } f_un; char f_prevline[MAXSVLINE]; /* last message logged */ char f_lasttime[16]; /* time of last occurrence */ char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ int f_prevpri; /* pri of f_prevline */ int f_prevlen; /* length of f_prevline */ int f_prevcount; /* repetition cnt of prevline */ unsigned int f_repeatcount; /* number of "repeated" msgs */ int f_quick; /* abort when matched */ time_t f_lasterrtime; /* last error was reported */ }; /* * Intervals at which we flush out "message repeated" messages, * in seconds after previous message is logged. After each flush, * we move to the next interval until we reach the largest. */ int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ (f)->f_repeatcount = MAXREPEAT; \ } /* values for f_type */ #define F_UNUSED 0 /* unused entry */ #define F_FILE 1 /* regular file */ #define F_TTY 2 /* terminal */ #define F_CONSOLE 3 /* console terminal */ #define F_FORWUDP 4 /* remote machine via UDP */ #define F_USERS 5 /* list of users */ #define F_WALL 6 /* everyone logged on */ #define F_MEMBUF 7 /* memory buffer */ #define F_PIPE 8 /* pipe to external program */ #define F_FORWTCP 9 /* remote machine via TCP */ char *TypeNames[] = { "UNUSED", "FILE", "TTY", "CONSOLE", "FORWUDP", "USERS", "WALL", "MEMBUF", "PIPE", "FORWTCP", }; SIMPLEQ_HEAD(filed_list, filed) Files; struct filed consfile; int nunix = 1; /* Number of Unix domain sockets requested */ char *path_unix[MAXUNIX] = { _PATH_LOG }; /* Paths to Unix domain sockets */ int Debug; /* debug flag */ int Startup = 1; /* startup flag */ char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ char *LocalDomain; /* our local domain name */ 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 = 1; /* when true, speak only unix domain socks */ int NoDNS = 0; /* when true, will refrain from doing DNS lookups */ int IPv4Only = 0; /* when true, disable IPv6 */ int IPv6Only = 0; /* when true, disable IPv4 */ int IncludeHostname = 0; /* include RFC 3164 style hostnames when forwarding */ char *path_ctlsock = NULL; /* Path to control socket */ #define CTL_READING_CMD 1 #define CTL_WRITING_REPLY 2 #define CTL_WRITING_CONT_REPLY 3 int ctl_state = 0; /* What the control socket is up to */ int membuf_drop = 0; /* logs were dropped in continuous membuf read */ /* * Client protocol NB. all numeric fields in network byte order */ #define CTL_VERSION 2 /* Request */ struct { u_int32_t version; #define CMD_READ 1 /* Read out log */ #define CMD_READ_CLEAR 2 /* Read and clear log */ #define CMD_CLEAR 3 /* Clear log */ #define CMD_LIST 4 /* List available logs */ #define CMD_FLAGS 5 /* Query flags only */ #define CMD_READ_CONT 6 /* Read out log continuously */ u_int32_t cmd; u_int32_t lines; char logname[MAX_MEMBUF_NAME]; } ctl_cmd; size_t ctl_cmd_bytes = 0; /* number of bytes of ctl_cmd read */ /* Reply */ struct ctl_reply_hdr { u_int32_t version; #define CTL_HDR_FLAG_OVERFLOW 0x01 u_int32_t flags; /* Reply text follows, up to MAX_MEMBUF long */ }; #define CTL_HDR_LEN (sizeof(struct ctl_reply_hdr)) #define CTL_REPLY_MAXSIZE (CTL_HDR_LEN + MAX_MEMBUF) #define CTL_REPLY_SIZE (strlen(reply_text) + CTL_HDR_LEN) char *ctl_reply = NULL; /* Buffer for control connection reply */ char *reply_text; /* Start of reply text in buffer */ size_t ctl_reply_size = 0; /* Number of bytes used in reply */ size_t ctl_reply_offset = 0; /* Number of bytes of reply written so far */ char *linebuf; int linesize; int fd_ctlsock, fd_ctlconn, fd_klog, fd_sendsys, fd_udp, fd_udp6, fd_unix[MAXUNIX]; struct event ev_ctlaccept, ev_ctlread, ev_ctlwrite, ev_klog, ev_sendsys, ev_udp, ev_udp6, ev_unix[MAXUNIX], ev_hup, ev_int, ev_quit, ev_term, ev_mark; void klog_readcb(int, short, void *); void udp_readcb(int, short, void *); void unix_readcb(int, short, void *); int tcp_socket(struct filed *); void tcp_readcb(struct bufferevent *, void *); void tcp_errorcb(struct bufferevent *, short, void *); void die_signalcb(int, short, void *); void mark_timercb(int, short, void *); void init_signalcb(int, short, void *); void ctlsock_acceptcb(int, short, void *); void ctlconn_readcb(int, short, void *); void ctlconn_writecb(int, short, void *); void ctlconn_logto(char *); void ctlconn_cleanup(void); struct filed *cfline(char *, char *); void cvthname(struct sockaddr *, char *, size_t); int decode(const char *, const CODE *); void die(int); void markit(void); void fprintlog(struct filed *, int, char *); void init(void); void logerror(const char *); void logmsg(int, char *, char *, int); struct filed *find_dup(struct filed *); void printline(char *, char *); void printsys(char *); char *ttymsg(struct iovec *, int, char *, int); void usage(void); void wallmsg(struct filed *, struct iovec *); int loghost(char *, char **, char **, char **); int getmsgbufsize(void); int unix_socket(char *, int, mode_t); void double_rbuf(int); void tailify_replytext(char *, int); int main(int argc, char *argv[]) { struct addrinfo hints, *res, *res0; struct timeval to; char *p; int ch, i; int lockpipe[2] = { -1, -1}, pair[2], nullfd, fd; while ((ch = getopt(argc, argv, "46dhnuf:m:p:a:s:")) != -1) switch (ch) { case '4': /* disable IPv6 */ IPv4Only = 1; IPv6Only = 0; break; case '6': /* disable IPv4 */ IPv6Only = 1; IPv4Only = 0; break; case 'd': /* debug */ Debug++; break; case 'f': /* configuration file */ ConfFile = optarg; break; case 'h': /* RFC 3164 hostnames */ IncludeHostname = 1; break; case 'm': /* mark interval */ MarkInterval = atoi(optarg) * 60; break; case 'n': /* don't do DNS lookups */ NoDNS = 1; break; case 'p': /* path */ path_unix[0] = optarg; break; case 'u': /* allow udp input port */ SecureMode = 0; break; case 'a': if (nunix >= MAXUNIX) fprintf(stderr, "syslogd: " "out of descriptors, ignoring %s\n", optarg); else path_unix[nunix++] = optarg; break; case 's': path_ctlsock = optarg; break; default: usage(); } if ((argc -= optind) != 0) usage(); if (Debug) setvbuf(stdout, NULL, _IOLBF, 0); if ((nullfd = open(_PATH_DEVNULL, O_RDWR)) == -1) { logerror("Couldn't open /dev/null"); die(0); } for (fd = nullfd + 1; fd <= 2; fd++) { if (fcntl(fd, F_GETFL, 0) == -1) if (dup2(nullfd, fd) == -1) logerror("dup2"); } consfile.f_type = F_CONSOLE; (void)strlcpy(consfile.f_un.f_fname, ctty, sizeof(consfile.f_un.f_fname)); (void)gethostname(LocalHostName, sizeof(LocalHostName)); if ((p = strchr(LocalHostName, '.')) != NULL) { *p++ = '\0'; LocalDomain = p; } else LocalDomain = ""; linesize = getmsgbufsize(); if (linesize < MAXLINE) linesize = MAXLINE; linesize++; if ((linebuf = malloc(linesize)) == NULL) { logerror("Couldn't allocate line buffer"); die(0); } memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_DGRAM; hints.ai_protocol = IPPROTO_UDP; hints.ai_flags = AI_PASSIVE; i = getaddrinfo(NULL, "syslog", &hints, &res0); if (i) { errno = 0; logerror("syslog/udp: unknown service"); die(0); } fd_udp = fd_udp6 = -1; for (res = res0; res; res = res->ai_next) { int *fdp; switch (res->ai_family) { case AF_INET: if (IPv6Only) continue; fdp = &fd_udp; break; case AF_INET6: if (IPv4Only) continue; fdp = &fd_udp6; break; default: continue; } if (*fdp >= 0) continue; *fdp = socket(res->ai_family, res->ai_socktype, res->ai_protocol); if (*fdp == -1) continue; if (bind(*fdp, res->ai_addr, res->ai_addrlen) < 0) { logerror("bind"); close(*fdp); *fdp = -1; if (!Debug) die(0); continue; } if (SecureMode) shutdown(*fdp, SHUT_RD); else double_rbuf(*fdp); } freeaddrinfo(res0); #ifndef SUN_LEN #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) #endif for (i = 0; i < nunix; i++) { fd_unix[i] = unix_socket(path_unix[i], SOCK_DGRAM, 0666); if (fd_unix[i] == -1) { if (i == 0 && !Debug) die(0); continue; } double_rbuf(fd_unix[i]); } if (socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pair) == -1) die(0); fd_sendsys = pair[0]; double_rbuf(fd_sendsys); fd_ctlsock = fd_ctlconn = -1; if (path_ctlsock != NULL) { fd_ctlsock = unix_socket(path_ctlsock, SOCK_STREAM, 0600); if (fd_ctlsock == -1) { dprintf("can't open %s (%d)\n", path_ctlsock, errno); if (!Debug) die(0); } else { if (listen(fd_ctlsock, 16) == -1) { logerror("ctlsock listen"); die(0); } } } fd_klog = open(_PATH_KLOG, O_RDONLY, 0); if (fd_klog == -1) { dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); } else { if (ioctl(fd_klog, LIOCSFD, &pair[1]) == -1) dprintf("LIOCSFD errno %d\n", errno); } close(pair[1]); dprintf("off & running....\n"); chdir("/"); tzset(); if (!Debug) { char c; pipe(lockpipe); switch(fork()) { case -1: exit(1); case 0: setsid(); close(lockpipe[0]); break; default: close(lockpipe[1]); read(lockpipe[0], &c, 1); _exit(0); } } /* tuck my process id away */ if (!Debug) { FILE *fp; fp = fopen(_PATH_LOGPID, "w"); if (fp != NULL) { fprintf(fp, "%ld\n", (long)getpid()); (void) fclose(fp); } } /* Privilege separation begins here */ if (priv_init(ConfFile, NoDNS, lockpipe[1], nullfd, argv) < 0) errx(1, "unable to privsep"); /* Process is now unprivileged and inside a chroot */ event_init(); event_set(&ev_ctlaccept, fd_ctlsock, EV_READ|EV_PERSIST, ctlsock_acceptcb, &ev_ctlaccept); event_set(&ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, ctlconn_readcb, &ev_ctlread); event_set(&ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, ctlconn_writecb, &ev_ctlwrite); event_set(&ev_klog, fd_klog, EV_READ|EV_PERSIST, klog_readcb, &ev_klog); event_set(&ev_sendsys, fd_sendsys, EV_READ|EV_PERSIST, unix_readcb, &ev_sendsys); event_set(&ev_udp, fd_udp, EV_READ|EV_PERSIST, udp_readcb, &ev_udp); event_set(&ev_udp6, fd_udp6, EV_READ|EV_PERSIST, udp_readcb, &ev_udp6); for (i = 0; i < nunix; i++) event_set(&ev_unix[i], fd_unix[i], EV_READ|EV_PERSIST, unix_readcb, &ev_unix[i]); signal_set(&ev_hup, SIGHUP, init_signalcb, &ev_hup); signal_set(&ev_int, SIGINT, die_signalcb, &ev_int); signal_set(&ev_quit, SIGQUIT, die_signalcb, &ev_quit); signal_set(&ev_term, SIGTERM, die_signalcb, &ev_term); evtimer_set(&ev_mark, mark_timercb, &ev_mark); init(); Startup = 0; /* Allocate ctl socket reply buffer if we have a ctl socket */ if (fd_ctlsock != -1 && (ctl_reply = malloc(CTL_REPLY_MAXSIZE)) == NULL) { logerror("Couldn't allocate ctlsock reply buffer"); die(0); } reply_text = ctl_reply + CTL_HDR_LEN; if (!Debug) { dup2(nullfd, STDIN_FILENO); dup2(nullfd, STDOUT_FILENO); dup2(nullfd, STDERR_FILENO); close(lockpipe[1]); } if (nullfd > 2) close(nullfd); /* * Signal to the priv process that the initial config parsing is done * so that it will reject any future attempts to open more files */ priv_config_parse_done(); if (fd_ctlsock != -1) event_add(&ev_ctlaccept, NULL); if (fd_klog != -1) event_add(&ev_klog, NULL); if (fd_sendsys != -1) event_add(&ev_sendsys, NULL); if (!SecureMode) { if (fd_udp != -1) event_add(&ev_udp, NULL); if (fd_udp6 != -1) event_add(&ev_udp6, NULL); } for (i = 0; i < nunix; i++) if (fd_unix[i] != -1) event_add(&ev_unix[i], NULL); signal_add(&ev_hup, NULL); signal_add(&ev_term, NULL); if (Debug) { signal_add(&ev_int, NULL); signal_add(&ev_quit, NULL); } else { (void)signal(SIGINT, SIG_IGN); (void)signal(SIGQUIT, SIG_IGN); } (void)signal(SIGCHLD, SIG_IGN); (void)signal(SIGPIPE, SIG_IGN); to.tv_sec = TIMERINTVL; to.tv_usec = 0; evtimer_add(&ev_mark, &to); logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: start", LocalHostName, ADDDATE); dprintf("syslogd: started\n"); event_dispatch(); /* NOTREACHED */ return (0); } void klog_readcb(int fd, short event, void *arg) { struct event *ev = arg; ssize_t n; n = read(fd, linebuf, linesize - 1); if (n > 0) { linebuf[n] = '\0'; printsys(linebuf); } else if (n < 0 && errno != EINTR) { logerror("klog"); event_del(ev); } } void udp_readcb(int fd, short event, void *arg) { struct sockaddr_storage sa; socklen_t salen; ssize_t n; salen = sizeof(sa); n = recvfrom(fd, linebuf, MAXLINE, 0, (struct sockaddr *)&sa, &salen); if (n > 0) { char resolve[MAXHOSTNAMELEN]; linebuf[n] = '\0'; cvthname((struct sockaddr *)&sa, resolve, sizeof(resolve)); dprintf("cvthname res: %s\n", resolve); printline(resolve, linebuf); } else if (n < 0 && errno != EINTR) logerror("recvfrom udp"); } void unix_readcb(int fd, short event, void *arg) { struct sockaddr_un sa; socklen_t salen; ssize_t n; salen = sizeof(sa); n = recvfrom(fd, linebuf, MAXLINE, 0, (struct sockaddr *)&sa, &salen); if (n > 0) { linebuf[n] = '\0'; printline(LocalHostName, linebuf); } else if (n == -1 && errno != EINTR) logerror("recvfrom unix"); } int tcp_socket(struct filed *f) { int s, flags; char ebuf[100]; if ((s = socket(f->f_un.f_forw.f_addr.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { snprintf(ebuf, sizeof(ebuf), "socket \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); return (-1); } /* Connect must not block the process. */ if ((flags = fcntl(s, F_GETFL)) == -1 || fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) { snprintf(ebuf, sizeof(ebuf), "fcntl \"%s\" O_NONBLOCK", f->f_un.f_forw.f_loghost); logerror(ebuf); close(s); return (-1); } if (connect(s, (struct sockaddr *)&f->f_un.f_forw.f_addr, f->f_un.f_forw.f_addr.ss_len) == -1 && errno != EINPROGRESS) { snprintf(ebuf, sizeof(ebuf), "connect \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); close(s); return (-1); } return (s); } void tcp_readcb(struct bufferevent *bufev, void *arg) { struct filed *f = arg; /* * Drop data received from the forward log server. */ dprintf("loghost \"%s\" did send %zu bytes back\n", f->f_un.f_forw.f_loghost, EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->input)); evbuffer_drain(bufev->input, -1); } void tcp_errorcb(struct bufferevent *bufev, short event, void *arg) { struct filed *f = arg; char ebuf[100]; if (event & EVBUFFER_EOF) snprintf(ebuf, sizeof(ebuf), "syslogd: loghost \"%s\" connection close", f->f_un.f_forw.f_loghost); else snprintf(ebuf, sizeof(ebuf), "syslogd: loghost \"%s\" connection error: %s", f->f_un.f_forw.f_loghost, strerror(errno)); dprintf("%s\n", ebuf); close(f->f_file); if ((f->f_file = tcp_socket(f)) == -1) { /* XXX reconnect later */ bufferevent_free(bufev); f->f_type = F_UNUSED; } else { /* XXX The messages in the output buffer may be out of sync. */ bufferevent_setfd(bufev, f->f_file); bufferevent_enable(f->f_un.f_forw.f_bufev, EV_READ); } logmsg(LOG_SYSLOG|LOG_WARNING, ebuf, LocalHostName, ADDDATE); } void usage(void) { (void)fprintf(stderr, "usage: syslogd [-46dhnu] [-a path] [-f config_file] [-m mark_interval]\n" " [-p log_socket] [-s reporting_socket]\n"); exit(1); } /* * Take a raw input line, decode the message, and print the message * on the appropriate log files. */ void printline(char *hname, char *msg) { int pri; char *p, *q, line[MAXLINE + 1]; /* test for special codes */ pri = DEFUPRI; p = msg; if (*p == '<') { pri = 0; while (isdigit((unsigned char)*++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. * NOTE: since LOG_KERN == 0 this will also match * messages with no facility specified. */ if (LOG_FAC(pri) == LOG_KERN) pri = LOG_USER | LOG_PRI(pri); for (q = line; *p && q < &line[sizeof(line) - 4]; p++) { if (*p == '\n') *q++ = ' '; else q = vis(q, *p, 0, 0); } *q = '\0'; logmsg(pri, line, hname, 0); } /* * Take a raw input line from /dev/klog, split and format similar to syslog(). */ void printsys(char *msg) { int c, pri, flags; char *lp, *p, *q, line[MAXLINE + 1]; (void)snprintf(line, sizeof line, "%s: ", _PATH_UNIX); lp = line + strlen(line); for (p = msg; *p != '\0'; ) { flags = SYNC_FILE | ADDDATE; /* fsync file after write */ pri = DEFSPRI; if (*p == '<') { pri = 0; while (isdigit((unsigned char)*++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; q = lp; while (*p && (c = *p++) != '\n' && q < &line[sizeof(line) - 4]) q = vis(q, c, 0, 0); logmsg(pri, line, LocalHostName, flags); } } time_t now; /* * Log a message to the appropriate log files, users, etc. based on * the priority. */ void logmsg(int pri, char *msg, char *from, int flags) { struct filed *f; int fac, msglen, prilev, i; char *timestamp; char prog[NAME_MAX+1]; dprintf("logmsg: pri 0%o, flags 0x%x, from %s, msg %s\n", pri, flags, from, msg); /* * 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; } /* extract facility and priority level */ if (flags & MARK) fac = LOG_NFACILITIES; else { fac = LOG_FAC(pri); if (fac >= LOG_NFACILITIES || fac < 0) fac = LOG_USER; } prilev = LOG_PRI(pri); /* extract program name */ while (isspace((unsigned char)*msg)) msg++; for (i = 0; i < NAME_MAX; i++) { if (!isalnum((unsigned char)msg[i]) && msg[i] != '-') break; prog[i] = msg[i]; } prog[i] = 0; /* log the message to the particular outputs */ if (!Initialized) { f = &consfile; f->f_file = priv_open_tty(ctty); if (f->f_file >= 0) { fprintlog(f, flags, msg); (void)close(f->f_file); f->f_file = -1; } return; } SIMPLEQ_FOREACH(f, &Files, f_next) { /* skip messages that are incorrect priority */ if (f->f_pmask[fac] < prilev || f->f_pmask[fac] == INTERNAL_NOPRI) continue; /* skip messages with the incorrect program 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)) { strlcpy(f->f_lasttime, timestamp, 16); f->f_prevcount++; dprintf("msg repeated %d times, %ld sec of %d\n", f->f_prevcount, (long)(now - f->f_time), repeatinterval[f->f_repeatcount]); /* * If domark would have logged this by now, * flush it now (so we don't hold isolated messages), * but back off so we'll flush less often * in the future. */ if (now > REPEATTIME(f)) { fprintlog(f, flags, (char *)NULL); BACKOFF(f); } } else { /* new line, save it */ if (f->f_prevcount) fprintlog(f, 0, (char *)NULL); f->f_repeatcount = 0; f->f_prevpri = pri; strlcpy(f->f_lasttime, timestamp, 16); strlcpy(f->f_prevhost, from, sizeof(f->f_prevhost)); if (msglen < MAXSVLINE) { f->f_prevlen = msglen; strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); fprintlog(f, flags, (char *)NULL); } else { f->f_prevline[0] = 0; f->f_prevlen = 0; fprintlog(f, flags, msg); } } if (f->f_quick) break; } } void fprintlog(struct filed *f, int flags, char *msg) { struct iovec iov[6]; struct iovec *v; int l, retryonce; char line[MAXLINE + 1], repbuf[80], greetings[500]; v = iov; if (f->f_type == F_WALL) { l = snprintf(greetings, sizeof(greetings), "\r\n\7Message from syslogd@%s at %.24s ...\r\n", f->f_prevhost, ctime(&now)); if (l < 0 || (size_t)l >= sizeof(greetings)) l = strlen(greetings); v->iov_base = greetings; v->iov_len = l; 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) { l = snprintf(repbuf, sizeof(repbuf), "last message repeated %d times", f->f_prevcount); if (l < 0 || (size_t)l >= sizeof(repbuf)) l = strlen(repbuf); v->iov_base = repbuf; v->iov_len = l; } 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_FORWUDP: dprintf(" %s\n", f->f_un.f_forw.f_loghost); l = snprintf(line, sizeof(line), "<%d>%.15s %s%s%s", f->f_prevpri, (char *)iov[0].iov_base, IncludeHostname ? LocalHostName : "", IncludeHostname ? " " : "", (char *)iov[4].iov_base); if (l < 0 || (size_t)l >= sizeof(line)) l = strlen(line); if (sendto(f->f_file, line, l, 0, (struct sockaddr *)&f->f_un.f_forw.f_addr, f->f_un.f_forw.f_addr.ss_len) != l) { switch (errno) { case EHOSTDOWN: case EHOSTUNREACH: case ENETDOWN: case ENETUNREACH: case ENOBUFS: /* silently dropped */ break; default: f->f_type = F_UNUSED; logerror("sendto"); break; } } break; case F_FORWTCP: dprintf(" %s\n", f->f_un.f_forw.f_loghost); if (EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) >= MAX_TCPBUF) break; /* XXX log error message */ /* * RFC 6587 3.4.2. Non-Transparent-Framing * Use \n to split messages for now. * 3.4.1. Octet Counting might be implemented later. */ l = evbuffer_add_printf(f->f_un.f_forw.f_bufev->output, "<%d>%.15s %s%s%s\n", f->f_prevpri, (char *)iov[0].iov_base, IncludeHostname ? LocalHostName : "", IncludeHostname ? " " : "", (char *)iov[4].iov_base); if (l < 0) break; /* XXX log error message */ bufferevent_enable(f->f_un.f_forw.f_bufev, EV_WRITE); break; case F_CONSOLE: if (flags & IGN_CONS) { dprintf(" (ignored)\n"); break; } /* FALLTHROUGH */ case F_TTY: case F_FILE: case F_PIPE: dprintf(" %s\n", f->f_un.f_fname); if (f->f_type != F_FILE && f->f_type != F_PIPE) { v->iov_base = "\r\n"; v->iov_len = 2; } else { v->iov_base = "\n"; v->iov_len = 1; } retryonce = 0; again: if (writev(f->f_file, iov, 6) < 0) { int e = errno; /* pipe is non-blocking. log and drop message if full */ if (e == EAGAIN && f->f_type == F_PIPE) { if (now - f->f_lasterrtime > 120) { f->f_lasterrtime = now; logerror(f->f_un.f_fname); } break; } (void)close(f->f_file); /* * Check for errors on TTY's or program pipes. * Errors happen due to loss of tty or died programs. */ if (e == EAGAIN) { /* * Silently drop messages on blocked write. * This can happen when logging to a locked tty. */ break; } else if ((e == EIO || e == EBADF) && f->f_type != F_FILE && f->f_type != F_PIPE && !retryonce) { f->f_file = priv_open_tty(f->f_un.f_fname); retryonce = 1; if (f->f_file < 0) { f->f_type = F_UNUSED; logerror(f->f_un.f_fname); } else goto again; } else if ((e == EPIPE || e == EBADF) && f->f_type == F_PIPE && !retryonce) { f->f_file = priv_open_log(f->f_un.f_fname); retryonce = 1; if (f->f_file < 0) { f->f_type = F_UNUSED; logerror(f->f_un.f_fname); } else goto again; } else { f->f_type = F_UNUSED; f->f_file = -1; errno = e; logerror(f->f_un.f_fname); } } else if (flags & SYNC_FILE) (void)fsync(f->f_file); break; case F_USERS: case F_WALL: dprintf("\n"); v->iov_base = "\r\n"; v->iov_len = 2; wallmsg(f, iov); break; case F_MEMBUF: dprintf("\n"); snprintf(line, sizeof(line), "%.15s %s %s", (char *)iov[0].iov_base, (char *)iov[2].iov_base, (char *)iov[4].iov_base); if (ringbuf_append_line(f->f_un.f_mb.f_rb, line) == 1) f->f_un.f_mb.f_overflow = 1; if (f->f_un.f_mb.f_attached) ctlconn_logto(line); break; } f->f_prevcount = 0; } /* * WALLMSG -- Write a message to the world at large * * Write the specified message to either the entire * world, or a list of approved users. */ void wallmsg(struct filed *f, struct iovec *iov) { struct utmp ut; char line[sizeof(ut.ut_line) + 1], *p; static int reenter; /* avoid calling ourselves */ FILE *uf; int i; if (reenter++) return; if ((uf = priv_open_utmp()) == NULL) { logerror(_PATH_UTMP); reenter = 0; return; } /* NOSTRICT */ while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { if (ut.ut_name[0] == '\0') continue; /* must use strncpy since ut_* may not be NUL terminated */ strncpy(line, ut.ut_line, sizeof(line) - 1); line[sizeof(line) - 1] = '\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; } /* * Return a printable representation of a host address. */ void cvthname(struct sockaddr *f, char *result, size_t res_len) { if (getnameinfo(f, f->sa_len, result, res_len, NULL, 0, NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM) != 0) { dprintf("Malformed from address\n"); strlcpy(result, "???", res_len); return; } dprintf("cvthname(%s)\n", result); if (NoDNS) return; if (priv_getnameinfo(f, f->sa_len, result, res_len) != 0) dprintf("Host name for your address (%s) unknown\n", result); } void die_signalcb(int signum, short event, void *arg) { die(signum); } void mark_timercb(int unused, short event, void *arg) { markit(); } void init_signalcb(int signum, short event, void *arg) { init(); logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); dprintf("syslogd: restarted\n"); } /* * Print syslogd errors some place. */ void logerror(const char *type) { char buf[100]; 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); if (Startup) fprintf(stderr, "%s\n", buf); else logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); } void die(int signo) { struct filed *f; int was_initialized = Initialized; char buf[100]; Initialized = 0; /* Don't log SIGCHLDs */ SIMPLEQ_FOREACH(f, &Files, f_next) { /* flush any pending output */ if (f->f_prevcount) fprintlog(f, 0, (char *)NULL); } Initialized = was_initialized; if (signo) { dprintf("syslogd: exiting on signal %d\n", signo); (void)snprintf(buf, sizeof buf, "exiting on signal %d", signo); errno = 0; logerror(buf); } dprintf("[unpriv] syslogd child about to exit\n"); exit(0); } /* * INIT -- Initialize syslogd from configuration table */ void init(void) { char cline[LINE_MAX], prog[NAME_MAX+1], *p; struct filed_list mb; struct filed *f, *m; FILE *cf; int i; dprintf("init\n"); /* If config file has been modified, then just die to restart */ if (priv_config_modified()) { dprintf("config file changed: dying\n"); die(0); } /* * Close all open log files. */ Initialized = 0; SIMPLEQ_INIT(&mb); while (!SIMPLEQ_EMPTY(&Files)) { f = SIMPLEQ_FIRST(&Files); SIMPLEQ_REMOVE_HEAD(&Files, f_next); /* flush any pending output */ if (f->f_prevcount) fprintlog(f, 0, (char *)NULL); switch (f->f_type) { case F_FORWTCP: /* XXX Save messages in output buffer for reconnect. */ bufferevent_free(f->f_un.f_forw.f_bufev); /* FALLTHROUGH */ case F_FILE: case F_TTY: case F_CONSOLE: case F_PIPE: (void)close(f->f_file); break; } if (f->f_program) free(f->f_program); if (f->f_type == F_MEMBUF) { f->f_program = NULL; dprintf("add %p to mb\n", f); SIMPLEQ_INSERT_HEAD(&mb, f, f_next); } else free(f); } SIMPLEQ_INIT(&Files); /* open the configuration file */ if ((cf = priv_open_config()) == NULL) { dprintf("cannot open %s\n", ConfFile); SIMPLEQ_INSERT_TAIL(&Files, cfline("*.ERR\t/dev/console", "*"), f_next); SIMPLEQ_INSERT_TAIL(&Files, cfline("*.PANIC\t*", "*"), f_next); Initialized = 1; return; } /* * Foreach line in the conf table, open that file. */ f = NULL; strlcpy(prog, "*", sizeof(prog)); while (fgets(cline, sizeof(cline), cf) != NULL) { /* * check for end-of-section, comments, strip off trailing * spaces and newline character. !prog is treated * specially: the following lines apply only to that program. */ for (p = cline; isspace((unsigned char)*p); ++p) continue; if (*p == '\0' || *p == '#') continue; if (*p == '!') { p++; while (isspace((unsigned char)*p)) p++; if (!*p || (*p == '*' && (!p[1] || isspace((unsigned char)p[1])))) { strlcpy(prog, "*", sizeof(prog)); continue; } for (i = 0; i < NAME_MAX; i++) { if (!isalnum((unsigned char)p[i]) && p[i] != '-' && p[i] != '!') break; prog[i] = p[i]; } prog[i] = 0; continue; } p = cline + strlen(cline); while (p > cline) if (!isspace((unsigned char)*--p)) { p++; break; } *p = '\0'; f = cfline(cline, prog); if (f != NULL) SIMPLEQ_INSERT_TAIL(&Files, f, f_next); } /* Match and initialize the memory buffers */ SIMPLEQ_FOREACH(f, &Files, f_next) { if (f->f_type != F_MEMBUF) continue; dprintf("Initialize membuf %s at %p\n", f->f_un.f_mb.f_mname, f); SIMPLEQ_FOREACH(m, &mb, f_next) { if (m->f_un.f_mb.f_rb == NULL) continue; if (strcmp(m->f_un.f_mb.f_mname, f->f_un.f_mb.f_mname) == 0) break; } if (m == NULL) { dprintf("Membuf no match\n"); f->f_un.f_mb.f_rb = ringbuf_init(f->f_un.f_mb.f_len); if (f->f_un.f_mb.f_rb == NULL) { f->f_type = F_UNUSED; logerror("Failed to allocate membuf"); } } else { dprintf("Membuf match f:%p, m:%p\n", f, m); f->f_un = m->f_un; m->f_un.f_mb.f_rb = NULL; } } /* make sure remaining buffers are freed */ while (!SIMPLEQ_EMPTY(&mb)) { m = SIMPLEQ_FIRST(&mb); SIMPLEQ_REMOVE_HEAD(&mb, f_next); if (m->f_un.f_mb.f_rb != NULL) { logerror("Mismatched membuf"); ringbuf_free(m->f_un.f_mb.f_rb); } dprintf("Freeing membuf %p\n", m); free(m); } /* close the configuration file */ (void)fclose(cf); Initialized = 1; if (Debug) { SIMPLEQ_FOREACH(f, &Files, f_next) { for (i = 0; i <= LOG_NFACILITIES; i++) if (f->f_pmask[i] == INTERNAL_NOPRI) printf("X "); else printf("%d ", f->f_pmask[i]); printf("%s: ", TypeNames[f->f_type]); switch (f->f_type) { case F_FILE: case F_TTY: case F_CONSOLE: case F_PIPE: printf("%s", f->f_un.f_fname); break; case F_FORWUDP: case F_FORWTCP: printf("%s", f->f_un.f_forw.f_loghost); break; case F_USERS: for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) printf("%s, ", f->f_un.f_uname[i]); break; case F_MEMBUF: printf("%s", f->f_un.f_mb.f_mname); break; } if (f->f_program) printf(" (%s)", f->f_program); printf("\n"); } } } #define progmatches(p1, p2) \ (p1 == p2 || (p1 != NULL && p2 != NULL && strcmp(p1, p2) == 0)) /* * Spot a line with a duplicate file, pipe, console, tty, or membuf target. */ struct filed * find_dup(struct filed *f) { struct filed *list; SIMPLEQ_FOREACH(list, &Files, f_next) { if (list->f_quick || f->f_quick) continue; switch (list->f_type) { case F_FILE: case F_TTY: case F_CONSOLE: case F_PIPE: if (strcmp(list->f_un.f_fname, f->f_un.f_fname) == 0 && progmatches(list->f_program, f->f_program)) return (list); break; case F_MEMBUF: if (strcmp(list->f_un.f_mb.f_mname, f->f_un.f_mb.f_mname) == 0 && progmatches(list->f_program, f->f_program)) return (list); break; } } return (NULL); } /* * Crack a configuration file line */ struct filed * cfline(char *line, char *prog) { int i, pri; size_t rb_len; char *bp, *p, *q, *proto, *host, *port; char buf[MAXLINE], ebuf[100]; struct filed *xf, *f, *d; dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); errno = 0; /* keep strerror() stuff out of logerror messages */ if ((f = calloc(1, sizeof(*f))) == NULL) { logerror("Couldn't allocate struct filed"); die(0); } for (i = 0; i <= LOG_NFACILITIES; i++) f->f_pmask[i] = INTERNAL_NOPRI; /* save program name if any */ if (*prog == '!') { f->f_quick = 1; prog++; } else f->f_quick = 0; if (!strcmp(prog, "*")) prog = NULL; else f->f_program = strdup(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 (*q && strchr(", ;", *q)) q++; /* decode priority name */ if (*buf == '*') pri = LOG_PRIMASK + 1; else { /* ignore trailing spaces */ for (i=strlen(buf)-1; i >= 0 && buf[i] == ' '; i--) { buf[i]='\0'; } pri = decode(buf, prioritynames); if (pri < 0) { (void)snprintf(ebuf, sizeof ebuf, "unknown priority name \"%s\"", buf); logerror(ebuf); free(f); return (NULL); } } /* scan facilities */ while (*p && !strchr("\t.;", *p)) { for (bp = buf; *p && !strchr("\t,;.", *p); ) *bp++ = *p++; *bp = '\0'; if (*buf == '*') for (i = 0; i < LOG_NFACILITIES; i++) f->f_pmask[i] = pri; else { i = decode(buf, facilitynames); if (i < 0) { (void)snprintf(ebuf, sizeof(ebuf), "unknown facility name \"%s\"", buf); logerror(ebuf); free(f); return (NULL); } f->f_pmask[i >> 3] = pri; } while (*p == ',' || *p == ' ') p++; } p = q; } /* skip to action part */ while (*p == '\t') p++; switch (*p) { case '@': if ((strlcpy(f->f_un.f_forw.f_loghost, p, sizeof(f->f_un.f_forw.f_loghost)) >= sizeof(f->f_un.f_forw.f_loghost))) { snprintf(ebuf, sizeof(ebuf), "loghost too long \"%s\"", p); logerror(ebuf); break; } if (loghost(++p, &proto, &host, &port) == -1) { snprintf(ebuf, sizeof(ebuf), "bad loghost \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); break; } if (proto == NULL) proto = "udp"; if (strcmp(proto, "udp") == 0) { if (fd_udp == -1) proto = "udp6"; if (fd_udp6 == -1) proto = "udp4"; } else if (strcmp(proto, "udp4") == 0) { if (fd_udp == -1) { snprintf(ebuf, sizeof(ebuf), "no udp4 \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); break; } } else if (strcmp(proto, "udp6") == 0) { if (fd_udp6 == -1) { snprintf(ebuf, sizeof(ebuf), "no udp6 \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); break; } } else if (strcmp(proto, "tcp") == 0 || strcmp(proto, "tcp4") == 0 || strcmp(proto, "tcp6") == 0) { ; } else { snprintf(ebuf, sizeof(ebuf), "bad protocol \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); break; } if (strlen(host) >= MAXHOSTNAMELEN) { snprintf(ebuf, sizeof(ebuf), "host too long \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); break; } if (port == NULL) port = "syslog"; if (strlen(port) >= NI_MAXSERV) { snprintf(ebuf, sizeof(ebuf), "port too long \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); break; } if (priv_getaddrinfo(proto, host, port, (struct sockaddr*)&f->f_un.f_forw.f_addr, sizeof(f->f_un.f_forw.f_addr)) != 0) { snprintf(ebuf, sizeof(ebuf), "bad hostname \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); break; } f->f_file = -1; if (strncmp(proto, "udp", 3) == 0) { switch (f->f_un.f_forw.f_addr.ss_family) { case AF_INET: f->f_file = fd_udp; break; case AF_INET6: f->f_file = fd_udp6; break; } f->f_type = F_FORWUDP; } else if (strncmp(proto, "tcp", 3) == 0) { int s; if ((s = tcp_socket(f)) == -1) break; if ((f->f_un.f_forw.f_bufev = bufferevent_new(s, tcp_readcb, NULL, tcp_errorcb, f)) == NULL) { snprintf(ebuf, sizeof(ebuf), "bufferevent \"%s\"", f->f_un.f_forw.f_loghost); logerror(ebuf); close(s); break; } bufferevent_enable(f->f_un.f_forw.f_bufev, EV_READ); f->f_file = s; f->f_type = F_FORWTCP; } break; case '/': case '|': (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); d = find_dup(f); if (d != NULL) { for (i = 0; i <= LOG_NFACILITIES; i++) if (f->f_pmask[i] != INTERNAL_NOPRI) d->f_pmask[i] = f->f_pmask[i]; free(f); return (NULL); } if (strcmp(p, ctty) == 0) f->f_file = priv_open_tty(p); else f->f_file = priv_open_log(p); if (f->f_file < 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; } else { if (*p == '|') f->f_type = F_PIPE; else { f->f_type = F_FILE; /* Clear O_NONBLOCK flag on f->f_file */ if ((i = fcntl(f->f_file, F_GETFL, 0)) != -1) { i &= ~O_NONBLOCK; fcntl(f->f_file, F_SETFL, i); } } } break; case '*': f->f_type = F_WALL; break; case ':': f->f_type = F_MEMBUF; /* Parse buffer size (in kb) */ errno = 0; rb_len = strtoul(++p, &q, 0); if (*p == '\0' || (errno == ERANGE && rb_len == ULONG_MAX) || *q != ':' || rb_len == 0) { f->f_type = F_UNUSED; logerror(p); break; } q++; rb_len *= 1024; /* Copy buffer name */ for(i = 0; (size_t)i < sizeof(f->f_un.f_mb.f_mname) - 1; i++) { if (!isalnum((unsigned char)q[i])) break; f->f_un.f_mb.f_mname[i] = q[i]; } /* Make sure buffer name is unique */ xf = find_dup(f); /* Error on missing or non-unique name, or bad buffer length */ if (i == 0 || rb_len > MAX_MEMBUF || xf != NULL) { f->f_type = F_UNUSED; logerror(p); break; } /* Set buffer length */ rb_len = MAX(rb_len, MIN_MEMBUF); f->f_un.f_mb.f_len = rb_len; f->f_un.f_mb.f_overflow = 0; f->f_un.f_mb.f_attached = 0; break; default: for (i = 0; i < MAXUNAMES && *p; i++) { for (q = p; *q && *q != ','; ) q++; (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); if ((q - p) > UT_NAMESIZE) f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; else f->f_un.f_uname[i][q - p] = '\0'; while (*q == ',' || *q == ' ') q++; p = q; } f->f_type = F_USERS; break; } return (f); } /* * Parse the host and port parts from a loghost string. */ int loghost(char *str, char **proto, char **host, char **port) { *proto = NULL; if ((*host = strchr(str, ':')) && (*host)[1] == '/' && (*host)[2] == '/') { *proto = str; **host = '\0'; str = *host + 3; } *host = str; if (**host == '[') { (*host)++; str = strchr(*host, ']'); if (str == NULL) return (-1); *str++ = '\0'; } *port = strrchr(str, ':'); if (*port != NULL) *(*port)++ = '\0'; return (0); } /* * Retrieve the size of the kernel message buffer, via sysctl. */ int getmsgbufsize(void) { int msgbufsize, mib[2]; size_t size; mib[0] = CTL_KERN; mib[1] = KERN_MSGBUFSIZE; size = sizeof msgbufsize; if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { dprintf("couldn't get kern.msgbufsize\n"); return (0); } return (msgbufsize); } /* * Decode a symbolic name to a numeric value */ int decode(const char *name, const CODE *codetab) { const CODE *c; char *p, buf[40]; for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { if (isupper((unsigned char)*name)) *p = tolower((unsigned char)*name); else *p = *name; } *p = '\0'; for (c = codetab; c->c_name; c++) if (!strcmp(buf, c->c_name)) return (c->c_val); return (-1); } void markit(void) { struct filed *f; now = time(NULL); MarkSeq += TIMERINTVL; if (MarkSeq >= MarkInterval) { logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); MarkSeq = 0; } SIMPLEQ_FOREACH(f, &Files, 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); } } } int unix_socket(char *path, int type, mode_t mode) { struct sockaddr_un s_un; char errbuf[512]; int fd; mode_t old_umask; memset(&s_un, 0, sizeof(s_un)); s_un.sun_family = AF_UNIX; if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >= sizeof(s_un.sun_path)) { snprintf(errbuf, sizeof(errbuf), "socket path too long: %s", path); logerror(errbuf); die(0); } if ((fd = socket(AF_UNIX, type, 0)) == -1) { logerror("socket"); return (-1); } if (Debug) { if (connect(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == 0 || errno == EPROTOTYPE) { close(fd); errno = EISCONN; logerror("connect"); return (-1); } } old_umask = umask(0177); unlink(path); if (bind(fd, (struct sockaddr *)&s_un, SUN_LEN(&s_un)) == -1) { snprintf(errbuf, sizeof(errbuf), "cannot bind %s", path); logerror(errbuf); umask(old_umask); close(fd); return (-1); } umask(old_umask); if (chmod(path, mode) == -1) { snprintf(errbuf, sizeof(errbuf), "cannot chmod %s", path); logerror(errbuf); close(fd); unlink(path); return (-1); } return (fd); } void double_rbuf(int fd) { socklen_t slen, len; slen = sizeof(len); if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { len *= 2; setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen); } } void ctlconn_cleanup(void) { struct filed *f; if (close(fd_ctlconn) == -1) logerror("close ctlconn"); fd_ctlconn = -1; event_del(&ev_ctlread); event_del(&ev_ctlwrite); event_add(&ev_ctlaccept, NULL); if (ctl_state == CTL_WRITING_CONT_REPLY) SIMPLEQ_FOREACH(f, &Files, f_next) if (f->f_type == F_MEMBUF) f->f_un.f_mb.f_attached = 0; ctl_state = ctl_cmd_bytes = ctl_reply_offset = ctl_reply_size = 0; } void ctlsock_acceptcb(int fd, short event, void *arg) { struct event *ev = arg; int flags; dprintf("Accepting control connection\n"); fd = accept(fd, NULL, NULL); if (fd == -1) { if (errno != EINTR && errno != EWOULDBLOCK && errno != ECONNABORTED) logerror("accept ctlsock"); return; } if (fd_ctlconn != -1) ctlconn_cleanup(); /* Only one connection at a time */ event_del(ev); if ((flags = fcntl(fd, F_GETFL)) == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) { logerror("fcntl ctlconn O_NONBLOCK"); close(fd); return; } fd_ctlconn = fd; /* file descriptor has changed, reset event */ event_set(&ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, ctlconn_readcb, &ev_ctlread); event_set(&ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, ctlconn_writecb, &ev_ctlwrite); event_add(&ev_ctlread, NULL); ctl_state = CTL_READING_CMD; ctl_cmd_bytes = 0; } static struct filed *find_membuf_log(const char *name) { struct filed *f; SIMPLEQ_FOREACH(f, &Files, f_next) { if (f->f_type == F_MEMBUF && strcmp(f->f_un.f_mb.f_mname, name) == 0) break; } return (f); } void ctlconn_readcb(int fd, short event, void *arg) { struct filed *f; struct ctl_reply_hdr *reply_hdr = (struct ctl_reply_hdr *)ctl_reply; ssize_t n; u_int32_t flags = 0; if (ctl_state == CTL_WRITING_REPLY || ctl_state == CTL_WRITING_CONT_REPLY) { /* client has closed the connection */ ctlconn_cleanup(); return; } retry: n = read(fd, (char*)&ctl_cmd + ctl_cmd_bytes, sizeof(ctl_cmd) - ctl_cmd_bytes); switch (n) { case -1: if (errno == EINTR) goto retry; logerror("ctlconn read"); /* FALLTHROUGH */ case 0: ctlconn_cleanup(); return; default: ctl_cmd_bytes += n; } if (ctl_cmd_bytes < sizeof(ctl_cmd)) return; if (ntohl(ctl_cmd.version) != CTL_VERSION) { logerror("Unknown client protocol version"); ctlconn_cleanup(); return; } /* Ensure that logname is \0 terminated */ if (memchr(ctl_cmd.logname, '\0', sizeof(ctl_cmd.logname)) == NULL) { logerror("Corrupt ctlsock command"); ctlconn_cleanup(); return; } *reply_text = '\0'; ctl_reply_size = ctl_reply_offset = 0; memset(reply_hdr, '\0', sizeof(*reply_hdr)); ctl_cmd.cmd = ntohl(ctl_cmd.cmd); dprintf("ctlcmd %x logname \"%s\"\n", ctl_cmd.cmd, ctl_cmd.logname); switch (ctl_cmd.cmd) { case CMD_READ: case CMD_READ_CLEAR: case CMD_READ_CONT: case CMD_FLAGS: f = find_membuf_log(ctl_cmd.logname); if (f == NULL) { strlcpy(reply_text, "No such log\n", MAX_MEMBUF); } else { if (ctl_cmd.cmd != CMD_FLAGS) { ringbuf_to_string(reply_text, MAX_MEMBUF, f->f_un.f_mb.f_rb); } if (f->f_un.f_mb.f_overflow) flags |= CTL_HDR_FLAG_OVERFLOW; if (ctl_cmd.cmd == CMD_READ_CLEAR) { ringbuf_clear(f->f_un.f_mb.f_rb); f->f_un.f_mb.f_overflow = 0; } if (ctl_cmd.cmd == CMD_READ_CONT) { f->f_un.f_mb.f_attached = 1; tailify_replytext(reply_text, ctl_cmd.lines > 0 ? ctl_cmd.lines : 10); } else if (ctl_cmd.lines > 0) { tailify_replytext(reply_text, ctl_cmd.lines); } } break; case CMD_CLEAR: f = find_membuf_log(ctl_cmd.logname); if (f == NULL) { strlcpy(reply_text, "No such log\n", MAX_MEMBUF); } else { ringbuf_clear(f->f_un.f_mb.f_rb); if (f->f_un.f_mb.f_overflow) flags |= CTL_HDR_FLAG_OVERFLOW; f->f_un.f_mb.f_overflow = 0; strlcpy(reply_text, "Log cleared\n", MAX_MEMBUF); } break; case CMD_LIST: SIMPLEQ_FOREACH(f, &Files, f_next) { if (f->f_type == F_MEMBUF) { strlcat(reply_text, f->f_un.f_mb.f_mname, MAX_MEMBUF); if (f->f_un.f_mb.f_overflow) { strlcat(reply_text, "*", MAX_MEMBUF); flags |= CTL_HDR_FLAG_OVERFLOW; } strlcat(reply_text, " ", MAX_MEMBUF); } } strlcat(reply_text, "\n", MAX_MEMBUF); break; default: logerror("Unsupported ctlsock command"); ctlconn_cleanup(); return; } reply_hdr->version = htonl(CTL_VERSION); reply_hdr->flags = htonl(flags); ctl_reply_size = CTL_REPLY_SIZE; dprintf("ctlcmd reply length %lu\n", (u_long)ctl_reply_size); /* Otherwise, set up to write out reply */ ctl_state = (ctl_cmd.cmd == CMD_READ_CONT) ? CTL_WRITING_CONT_REPLY : CTL_WRITING_REPLY; event_add(&ev_ctlwrite, NULL); /* another syslogc can kick us out */ if (ctl_state == CTL_WRITING_CONT_REPLY) event_add(&ev_ctlaccept, NULL); } void ctlconn_writecb(int fd, short event, void *arg) { struct event *ev = arg; ssize_t n; if (!(ctl_state == CTL_WRITING_REPLY || ctl_state == CTL_WRITING_CONT_REPLY)) { /* Shouldn't be here! */ logerror("ctlconn_write with bad ctl_state"); ctlconn_cleanup(); return; } retry: n = write(fd, ctl_reply + ctl_reply_offset, ctl_reply_size - ctl_reply_offset); switch (n) { case -1: if (errno == EINTR) goto retry; if (errno != EPIPE) logerror("ctlconn write"); /* FALLTHROUGH */ case 0: ctlconn_cleanup(); return; default: ctl_reply_offset += n; } if (ctl_reply_offset < ctl_reply_size) return; if (ctl_state != CTL_WRITING_CONT_REPLY) { ctlconn_cleanup(); return; } /* * Make space in the buffer for continous writes. * Set offset behind reply header to skip it */ *reply_text = '\0'; ctl_reply_offset = ctl_reply_size = CTL_REPLY_SIZE; /* Now is a good time to report dropped lines */ if (membuf_drop) { strlcat(reply_text, "\n", MAX_MEMBUF); ctl_reply_size = CTL_REPLY_SIZE; membuf_drop = 0; } else { /* Nothing left to write */ event_del(ev); } } /* Shorten replytext to number of lines */ void tailify_replytext(char *replytext, int lines) { char *start, *nl; int count = 0; start = nl = replytext; while ((nl = strchr(nl, '\n')) != NULL) { nl++; if (++count > lines) { start = strchr(start, '\n'); start++; } } if (start != replytext) { int len = strlen(start); memmove(replytext, start, len); *(replytext + len) = '\0'; } } void ctlconn_logto(char *line) { size_t l; if (membuf_drop) return; l = strlen(line); if (l + 2 > (CTL_REPLY_MAXSIZE - ctl_reply_size)) { /* remember line drops for later report */ membuf_drop = 1; return; } memcpy(ctl_reply + ctl_reply_size, line, l); memcpy(ctl_reply + ctl_reply_size + l, "\n", 2); ctl_reply_size += l + 1; event_add(&ev_ctlwrite, NULL); }