diff --git a/usr.sbin/syslogd/syslogd.c b/usr.sbin/syslogd/syslogd.c index fcf7d4747706..755552ecd21c 100644 --- a/usr.sbin/syslogd/syslogd.c +++ b/usr.sbin/syslogd/syslogd.c @@ -1,3660 +1,3666 @@ /*- * 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 * * 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. */ /* * 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. * * 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 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(INET) || defined(INET6) #include #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" #include "syslogd.h" #include "syslogd_cap.h" const char *ConfFile = _PATH_LOGCONF; static const char *PidFile = _PATH_LOGPID; static const char include_str[] = "include"; static const char include_ext[] = ".conf"; #define dprintf if (Debug) printf #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 that can't be bound until * flags have been parsed. */ 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); /* * Sockets used for logging; monitored by kevent(). */ 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; char *sl_name; int sl_dirfd; 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 */ /* Traditional syslog timestamp format. */ #define RFC3164_DATELEN 15 #define RFC3164_DATEFMT "%b %e %H:%M:%S" static STAILQ_HEAD(, filed) fhead = STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ static struct filed consfile; /* Console */ /* * Queue of about-to-be dead processes we should watch out for. */ struct deadq_entry { int dq_procdesc; 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 /* * Network addresses that are allowed to log to us. */ struct allowedpeer { bool 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) static const char *TypeNames[] = { "UNUSED", "FILE", "TTY", "CONSOLE", "FORW", "USERS", "WALL", "PIPE", }; static const int sigcatch[] = { SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, }; static int nulldesc; /* /dev/null descriptor */ static bool Debug; /* debug flag */ static bool Foreground = false; /* Run in foreground, instead of daemonizing */ static bool resolve = true; /* resolve hostname */ char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ static const char *LocalDomain; /* our local domain name */ static bool Initialized; /* set when we have initialized ourselves */ static int MarkInterval = 20 * 60; /* interval between marks in seconds */ static int MarkSeq; /* mark sequence number */ static bool 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 bool RemoteAddDate; /* Always set the date on remote messages */ static bool RemoteHostname; /* Log remote hostname from the message */ static bool UniquePriority; /* Only log specified priority? */ static int LogFacPri; /* Put facility and priority in log message: */ /* 0=no, 1=numeric, 2=names */ static bool KeepKernFac; /* Keep remotely logged kernel facility */ static bool needdofsync = true; /* Are any file(s) waiting to be fsynced? */ static struct pidfh *pfh; static bool RFC3164OutputFormat = true; /* Use legacy format by default. */ struct iovlist; static bool allowaddr(char *); static void addpeer(const char *, const char *, mode_t); static void addsock(const char *, const char *, mode_t); static nvlist_t *cfline(const char *, const char *, const char *, const char *); static const char *cvthname(struct sockaddr *); static void deadq_enter(int); static void deadq_remove(struct deadq_entry *); static int decode(const char *, const CODE *); static void die(int) __dead2; static void dofsync(void); 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(bool); static void logmsg(int, const struct logtime *, const char *, const char *, const char *, const char *, const char *, const char *, int); static void markit(void); static struct socklist *socksetup(struct addrinfo *, const char *, mode_t); static int socklist_recv_file(struct socklist *); static int socklist_recv_sock(struct socklist *); static int skip_message(const char *, const char *, int); static int evaluate_prop_filter(const struct prop_filter *filter, const char *value); static nvlist_t *prop_filter_compile(const char *); static void parsemsg(const char *, char *); static void printsys(char *); static const char *ttymsg_check(struct iovec *, int, char *, int); static void usage(void); static bool validate(struct sockaddr *, const char *); static void unmapped(struct sockaddr *); static int waitdaemon(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->f_addr != NULL) { freeaddrinfo(f->f_addr); f->f_addr = NULL; } /* FALLTHROUGH */ case F_FILE: case F_TTY: case F_CONSOLE: f->f_type = F_UNUSED; break; case F_PIPE: if (f->f_procdesc >= 0) { deadq_enter(f->f_procdesc); f->f_procdesc = -1; } break; default: break; } (void)close(f->f_file); f->f_file = -1; } static void addpeer(const char *name, const char *serv, mode_t mode) { struct peer *pe = calloc(1, sizeof(*pe)); if (pe == NULL) err(1, "malloc failed"); pe->pe_name = name; pe->pe_serv = serv; pe->pe_mode = mode; STAILQ_INSERT_TAIL(&pqueue, pe, next); } static void addsock(const char *name, const char *serv, mode_t mode) { struct addrinfo hints = { }, *res, *res0; struct socklist *sl; int error; char *cp, *msgbuf; /* * 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 (name != NULL) { #ifdef INET6 if (name[0] == '[' && (cp = strchr(name + 1, ']')) != NULL) { name = &name[1]; *cp = '\0'; if (cp[1] == ':' && cp[2] != '\0') serv = cp + 2; } else { #endif cp = strchr(name, ':'); if (cp != NULL && strchr(cp + 1, ':') == NULL) { *cp = '\0'; if (cp[1] != '\0') serv = cp + 1; if (cp == name) name = NULL; } #ifdef INET6 } #endif } hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_DGRAM; hints.ai_flags = AI_PASSIVE; if (name != NULL) dprintf("Trying peer: %s\n", name); if (serv == NULL) serv = "syslog"; error = getaddrinfo(name, serv, &hints, &res0); if (error == EAI_NONAME && name == NULL && SecureMode > 1) { /* * If we're in secure mode, we won't open inet sockets anyway. * This failure can arise legitimately when running in a jail * without networking. */ return; } if (error) { asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", name == NULL ? "" : name, 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) { sl = socksetup(res, name, mode); if (sl == NULL) continue; STAILQ_INSERT_TAIL(&shead, sl, next); } freeaddrinfo(res0); } static void addfile(int fd) { struct socklist *sl = calloc(1, sizeof(*sl)); if (sl == NULL) err(1, "malloc failed"); sl->sl_socket = fd; sl->sl_recv = socklist_recv_file; STAILQ_INSERT_TAIL(&shead, sl, next); } int main(int argc, char *argv[]) { struct sigaction act = { }; struct kevent ev; struct socklist *sl; pid_t spid; int ch, kq, ppipe_w = -1, s; char *p; bool bflag = false, pflag = false, Sflag = false; 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 = true; break; case 'a': /* allow specific network addresses only */ if (!allowaddr(optarg)) usage(); break; case 'b': bflag = true; 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(optarg, "syslog", 0); } else { /* The case of "name:service". */ *p++ = '\0'; addpeer(strlen(optarg) == 0 ? NULL : optarg, p, 0); } break; case 'c': no_compress++; break; case 'C': logflags |= O_CREAT; break; case 'd': /* debug */ Debug = true; break; case 'f': /* configuration file */ ConfFile = optarg; break; case 'F': /* run in foreground instead of daemon */ Foreground = true; break; case 'H': RemoteHostname = true; break; case 'k': /* keep remote kern fac */ KeepKernFac = true; 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 = true; } else { mode = S_IRUSR | S_IWUSR; Sflag = true; } 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(name, NULL, 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 = true; if (!SecureMode) SecureMode = 1; break; case 'n': resolve = false; 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 = true; break; case 'P': /* path for alt. PID */ PidFile = optarg; break; case 's': /* no network mode */ SecureMode++; break; case 'T': RemoteAddDate = true; break; case 'u': /* only log specified priority */ UniquePriority = true; 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"); 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"); } /* * Now that flags have been parsed, we know if we're in * secure mode. Add peers to the socklist, if allowed. */ while (!STAILQ_EMPTY(&pqueue)) { struct peer *pe = STAILQ_FIRST(&pqueue); STAILQ_REMOVE_HEAD(&pqueue, next); addsock(pe->pe_name, pe->pe_serv, pe->pe_mode); free(pe); } /* 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 { addfile(s); } /* Listen by default: *:514 if no -b flag. */ if (bflag == 0) addsock(NULL, "syslog", 0); /* Listen by default: /var/run/log if no -p flag. */ if (pflag == 0) addsock(_PATH_LOG, NULL, DEFFILEMODE); /* Listen by default: /var/run/logpriv if no -S flag. */ if (Sflag == 0) addsock(_PATH_LOG_PRIV, NULL, S_IRUSR | S_IWUSR); consfile.f_type = F_CONSOLE; consfile.f_file = -1; (void)strlcpy(consfile.f_fname, _PATH_CONSOLE + sizeof(_PATH_DEV) - 1, sizeof(consfile.f_fname)); nulldesc = open(_PATH_DEVNULL, O_RDWR); if (nulldesc == -1) { warn("cannot open %s", _PATH_DEVNULL); pidfile_remove(pfh); exit(1); } (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); if (!Foreground && !Debug) ppipe_w = waitdaemon(30); else if (Debug) setlinebuf(stdout); kq = kqueue(); if (kq == -1) { warn("failed to initialize kqueue"); pidfile_remove(pfh); exit(1); } STAILQ_FOREACH(sl, &shead, next) { if (sl->sl_recv == NULL) continue; EV_SET(&ev, sl->sl_socket, EVFILT_READ, EV_ADD, 0, 0, sl); if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { warn("failed to add kevent to kqueue"); pidfile_remove(pfh); exit(1); } } /* * Syslogd will not reap its children via wait(). * When SIGCHLD is ignored, zombie processes are * not created. A child's PID will be recycled * upon its exit. */ act.sa_handler = SIG_IGN; for (size_t i = 0; i < nitems(sigcatch); ++i) { EV_SET(&ev, sigcatch[i], EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { warn("failed to add kevent to kqueue"); pidfile_remove(pfh); exit(1); } if (sigaction(sigcatch[i], &act, NULL) == -1) { warn("failed to apply signal handler"); pidfile_remove(pfh); exit(1); } } (void)alarm(TIMERINTVL); /* tuck my process id away */ pidfile_write(pfh); dprintf("off & running....\n"); init(false); for (;;) { if (needdofsync) { dofsync(); if (ppipe_w != -1) { /* * Close our end of the pipe so our * parent knows that we have finished * initialization. */ (void)close(ppipe_w); ppipe_w = -1; } } if (kevent(kq, NULL, 0, &ev, 1, NULL) == -1) { if (errno != EINTR) logerror("kevent"); continue; } switch (ev.filter) { case EVFILT_READ: sl = ev.udata; if (sl->sl_socket != -1 && sl->sl_recv != NULL) sl->sl_recv(sl); break; case EVFILT_SIGNAL: switch (ev.ident) { case SIGHUP: init(true); break; case SIGINT: case SIGQUIT: case SIGTERM: if (ev.ident == SIGTERM || Debug) die(ev.ident); break; case SIGALRM: markit(); break; } break; } } } 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(×tamp_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(×tamp_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 : ×tamp_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(×tamp_remote.tm) < t_now + 7 * 24 * 60 * 60) break; } timestamp = ×tamp_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 || *spec == '\0') 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 & FILT_FLAG_EXCLUDE) > 0); size_t valuelen; if (value == NULL) return (-1); if (filter->cmp_type == FILT_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 == FILT_CMP_EQUAL && valuelen != strlen(filter->pflt_strval)) return (!exclude); if (filter->cmp_flags & FILT_FLAG_ICASE) s = strcasestr(value, filter->pflt_strval); else s = strstr(value, filter->pflt_strval); /* * FILT_CMP_CONTAINS true if s * FILT_CMP_STARTS true if s && s == value * FILT_CMP_EQUAL true if s && s == value && * valuelen == filter->pflt_strlen * (and length match is checked * already) */ switch (filter->cmp_type) { case FILT_CMP_STARTS: case FILT_CMP_EQUAL: if (s != value) return (!exclude); /* FALLTHROUGH */ case FILT_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, ×tamp_now.tm); timestamp_now.usec = tv.tv_usec; timestamp = ×tamp_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) { consfile.f_lasttime = *timestamp; fprintlog_first(&consfile, hostname, app_name, procid, msgid, structured_data, msg, flags); 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 != FILT_PROP_NOOP) { switch (f->f_prop_filter->prop_type) { case FILT_PROP_MSG: if (evaluate_prop_filter(f->f_prop_filter, msg)) continue; break; case FILT_PROP_HOSTNAME: if (evaluate_prop_filter(f->f_prop_filter, hostname)) continue; break; case FILT_PROP_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) != 0) { f->f_flags &= ~FFLAG_NEEDSYNC; (void)fsync(f->f_file); } } needdofsync = false; } 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->f_hname); switch (f->f_addr->ai_family) { #ifdef INET case AF_INET: dprintf(":%d\n", ntohs(satosin(f->f_addr->ai_addr)->sin_port)); break; #endif #ifdef INET6 case AF_INET6: dprintf(":%d\n", ntohs(satosin6(f->f_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->f_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->f_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->f_fname); } } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { f->f_flags |= FFLAG_NEEDSYNC; needdofsync = true; } break; case F_PIPE: dprintf(" %s\n", f->f_pname); iovlist_append(il, "\n"); if (f->f_procdesc == -1) { struct filed *f_in_list; size_t i = 0; STAILQ_FOREACH(f_in_list, &fhead, next) { if (f_in_list == f) break; ++i; } f->f_file = p_open(i, f->f_pname, &f->f_procdesc); if (f->f_file < 0) { logerror(f->f_pname); break; } } if (writev(f->f_file, il->iov, il->iovcnt) < 0) { logerror(f->f_pname); close_filed(f); } break; case F_CONSOLE: if (flags & IGN_CONS) { dprintf(" (ignored)\n"); break; } /* FALLTHROUGH */ case F_TTY: dprintf(" %s%s\n", _PATH_DEV, f->f_fname); iovlist_append(il, "\r\n"); errno = 0; /* ttymsg() only sometimes returns an errno */ if ((msgret = ttymsg(il->iov, il->iovcnt, f->f_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; default: 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. * * Note: This function is wrapped by cap_wallmsg() when Capsicum support is * enabled so ttymsg() can be called. */ void wallmsg(const 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) dprintf("%s\n", p); continue; } /* should we send the message to this user? */ for (i = 0; i < MAXUNAMES; i++) { if (!f->f_uname[i][0]) break; if (!strcmp(f->f_uname[i], ut->ut_user)) { if ((p = ttymsg_check(iov, iovlen, ut->ut_line, TTYMSGTIME)) != NULL) dprintf("%s\n", 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)); } /* * 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); } /* * Print syslogd errors some place. */ 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", msg); 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); /* close our end of the pipe */ if (f->f_type == F_PIPE) 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) { if (unlinkat(sl->sl_dirfd, sl->sl_name, 0) == -1) { dprintf("Failed to unlink %s: %s", sl->sl_name, strerror(errno)); } } } 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 nvlist_t * parseconfigfile(FILE *cf, bool allow_includes, nvlist_t *nvl_conf) { FILE *cf2; 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); parseconfigfile(cf2, false, nvl_conf); 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 == '\0' || *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 == '\0' || *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 == '\0' || *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'; nvlist_append_nvlist_array(nvl_conf, "filed_list", cfline(cline, prog, host, pfilter)); } return (nvl_conf); } /* * Read configuration file and create filed entries for each line. * * Note: This function is wrapped by cap_readconfigfile() when Capsicum * support is enabled so resources can be acquired outside of the security * sandbox. */ nvlist_t * readconfigfile(const char *path) { FILE *cf; nvlist_t *nvl_conf = nvlist_create(0); if ((cf = fopen(path, "r")) != NULL) { nvl_conf = parseconfigfile(cf, true, nvl_conf); (void)fclose(cf); } else { dprintf("cannot open %s\n", path); nvlist_append_nvlist_array(nvl_conf, "filed_list", cfline("*.ERR\t/dev/console", "*", "*", "*")); nvlist_append_nvlist_array(nvl_conf, "filed_list", cfline("*.PANIC\t*", "*", "*", "*")); } return (nvl_conf); } static void fill_flist(nvlist_t *nvl_conf) { const nvlist_t * const *filed_list; size_t nfileds; if (!nvlist_exists_nvlist_array(nvl_conf, "filed_list")) return; filed_list = nvlist_get_nvlist_array(nvl_conf, "filed_list", &nfileds); for (size_t i = 0; i < nfileds; ++i) { struct filed *f; f = nvlist_to_filed(filed_list[i]); STAILQ_INSERT_TAIL(&fhead, f, next); } nvlist_destroy(nvl_conf); } /* * Close all open log files. */ void closelogfiles(void) { struct filed *f; while (!STAILQ_EMPTY(&fhead)) { f = STAILQ_FIRST(&fhead); STAILQ_REMOVE_HEAD(&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: case F_PIPE: close_filed(f); break; default: break; } if (f->f_prop_filter) { switch (f->f_prop_filter->cmp_type) { case FILT_CMP_REGEX: regfree(f->f_prop_filter->pflt_re); free(f->f_prop_filter->pflt_re); /* FALLTHROUGH */ case FILT_CMP_CONTAINS: case FILT_CMP_EQUAL: case FILT_CMP_STARTS: free(f->f_prop_filter->pflt_strval); break; } free(f->f_prop_filter); } free(f); } } /* * INIT -- Initialize syslogd from configuration table */ static void init(bool reload) { int i; char *p; char oldLocalHostName[MAXHOSTNAMELEN]; char hostMsg[2*MAXHOSTNAMELEN+40]; char bootfileMsg[MAXLINE + 1]; dprintf("init\n"); /* * Load hostname (may have changed). */ if (reload) (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 = ""; } +#ifndef WITH_CASPER /* + * XXX: Disable when running in capability mode, for now. + * This requires a new interface in the tzcode module to + * get running without capability violations. + * * 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"); } +#endif Initialized = false; closelogfiles(); fill_flist(readconfigfile(ConfFile)); Initialized = true; if (Debug) { struct filed *f; 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->f_fname); break; case F_CONSOLE: case F_TTY: printf("%s%s", _PATH_DEV, f->f_fname); break; case F_FORW: switch (f->f_addr->ai_family) { #ifdef INET case AF_INET: port = ntohs(satosin(f->f_addr->ai_addr)->sin_port); break; #endif #ifdef INET6 case AF_INET6: port = ntohs(satosin6(f->f_addr->ai_addr)->sin6_port); break; #endif default: port = 0; } if (port != 514) { printf("%s:%d", f->f_hname, port); } else { printf("%s", f->f_hname); } break; case F_PIPE: printf("%s", f->f_pname); break; case F_USERS: for (i = 0; i < MAXUNAMES && *f->f_uname[i]; i++) printf("%s, ", f->f_uname[i]); break; default: break; } if (*f->f_program != '\0') 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 reload. */ if (reload && 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 reload. */ if (!reload && !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. */ static nvlist_t * prop_filter_compile(const char *cfilter) { nvlist_t *nvl_pfilter; struct prop_filter pfilter = { }; char *filter, *filter_endpos, *filter_begpos, *p; char **ap, *argv[2] = {NULL, NULL}; int escaped; filter = strdup(cfilter); if (filter == NULL) err(1, "strdup"); filter_begpos = 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) { dprintf("filter parse error"); goto error; } /* fill in prop_type */ if (strcasecmp(argv[0], "msg") == 0) pfilter.prop_type = FILT_PROP_MSG; else if (strcasecmp(argv[0], "hostname") == 0) pfilter.prop_type = FILT_PROP_HOSTNAME; else if (strcasecmp(argv[0], "source") == 0) pfilter.prop_type = FILT_PROP_HOSTNAME; else if (strcasecmp(argv[0], "programname") == 0) pfilter.prop_type = FILT_PROP_PROGNAME; else { dprintf("unknown property"); goto error; } /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ if (*argv[1] == '!') { pfilter.cmp_flags |= FILT_FLAG_EXCLUDE; argv[1]++; } if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { pfilter.cmp_flags |= FILT_FLAG_ICASE; argv[1] += sizeof("icase_") - 1; } /* fill in cmp_type */ if (strcasecmp(argv[1], "contains") == 0) pfilter.cmp_type = FILT_CMP_CONTAINS; else if (strcasecmp(argv[1], "isequal") == 0) pfilter.cmp_type = FILT_CMP_EQUAL; else if (strcasecmp(argv[1], "startswith") == 0) pfilter.cmp_type = FILT_CMP_STARTS; else if (strcasecmp(argv[1], "regex") == 0) pfilter.cmp_type = FILT_CMP_REGEX; else if (strcasecmp(argv[1], "ereregex") == 0) { pfilter.cmp_type = FILT_CMP_REGEX; pfilter.cmp_flags |= REG_EXTENDED; } else { dprintf("unknown cmp function"); goto error; } /* * Handle filter value */ /* ' ".*Deny.*"' */ /* remove leading whitespace and check for '"' next character */ filter += strspn(filter, ", \t\n"); if (*filter != '"' || strlen(filter) < 3) { dprintf("property value parse error"); goto error; } 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)) { dprintf("property value parse error"); goto error; } pfilter.pflt_strval = filter; /* An nvlist is heap allocated heap here. */ nvl_pfilter = prop_filter_to_nvlist(&pfilter); free(filter_begpos); return (nvl_pfilter); error: free(filter_begpos); return (NULL); } static const char * parse_selector(const char *p, struct filed *f) { int i, pri; int pri_done = 0, pri_cmp = 0, pri_invert = 0; char *bp, buf[LINE_MAX]; const char *q; /* find the end of this facility name list */ for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.';) continue; /* get the priority comparison */ 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 != '\0' && !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) { dprintf("unknown priority name \"%s\"", buf); 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 != '\0' && !strchr("\t.; ", *p)) { for (bp = buf; *p != '\0' && !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) { dprintf("unknown facility name \"%s\"", buf); free(f); return (NULL); } f->f_pmask[i >> 3] = pri; f->f_pcmp[i >> 3] = pri_cmp; } while (*p == ',' || *p == ' ') p++; } return (q); } static void parse_action(const char *p, struct filed *f) { struct addrinfo hints, *res; int error, i; const char *q; bool syncfile; if (*p == '-') { syncfile = false; p++; } else syncfile = true; f->f_file = -1; switch (*p) { case '@': { char *tp; char endkey = ':'; /* * scan forward to see if there is a port defined. * so we can't use strlcpy.. */ i = sizeof(f->f_hname); tp = f->f_hname; p++; /* * an ipv6 address should start with a '[' in that case * we should scan for a ']' */ if (*p == '[') { p++; endkey = ']'; } while (*p && (*p != endkey) && (i-- > 0)) { *tp++ = *p++; } if (endkey == ']' && *p == endkey) p++; *tp = '\0'; } /* See if we copied a domain and have a port */ if (*p == ':') p++; else p = NULL; hints = (struct addrinfo){ .ai_family = family, .ai_socktype = SOCK_DGRAM }; error = getaddrinfo(f->f_hname, p ? p : "syslog", &hints, &res); if (error) { dprintf("%s\n", gai_strerror(error)); break; } f->f_addr = res; f->f_type = F_FORW; break; case '/': if ((f->f_file = open(p, logflags, 0600)) < 0) { f->f_type = F_UNUSED; dprintf("%s\n", p); break; } if (syncfile) f->f_flags |= FFLAG_SYNC; if (isatty(f->f_file)) { if (strcmp(p, _PATH_CONSOLE) == 0) f->f_type = F_CONSOLE; else f->f_type = F_TTY; (void)strlcpy(f->f_fname, p + sizeof(_PATH_DEV) - 1, sizeof(f->f_fname)); } else { (void)strlcpy(f->f_fname, p, sizeof(f->f_fname)); f->f_type = F_FILE; } break; case '|': f->f_procdesc = -1; (void)strlcpy(f->f_pname, p + 1, sizeof(f->f_pname)); f->f_type = F_PIPE; break; case '*': f->f_type = F_WALL; break; default: for (i = 0; i < MAXUNAMES && *p; i++) { for (q = p; *q && *q != ','; ) q++; (void)strncpy(f->f_uname[i], p, MAXLOGNAME - 1); if ((q - p) >= MAXLOGNAME) f->f_uname[i][MAXLOGNAME - 1] = '\0'; else f->f_uname[i][q - p] = '\0'; while (*q == ',' || *q == ' ') q++; p = q; } f->f_type = F_USERS; break; } } /* * Crack a configuration file line */ static nvlist_t * cfline(const char *line, const char *prog, const char *host, const char *pfilter) { nvlist_t *nvl_filed; struct filed f = { }; const char *p; dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, host, pfilter); for (int i = 0; i <= LOG_NFACILITIES; i++) f.f_pmask[i] = INTERNAL_NOPRI; /* save hostname if any */ if (host != NULL && *host != '*') { int hl; strlcpy(f.f_host, host, sizeof(f.f_host)); 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 != NULL && *prog != '*') strlcpy(f.f_program, prog, sizeof(f.f_program)); /* scan through the list of selectors */ for (p = line; *p != '\0' && *p != '\t' && *p != ' ';) p = parse_selector(p, &f); /* skip to action part */ while (*p == '\t' || *p == ' ') p++; parse_action(p, &f); /* An nvlist is heap allocated heap here. */ nvl_filed = filed_to_nvlist(&f); if (pfilter && *pfilter != '*') { nvlist_t *nvl_pfilter; nvl_pfilter = prop_filter_compile(pfilter); if (nvl_pfilter == NULL) err(1, "filter compile error"); nvlist_add_nvlist(nvl_filed, "f_prop_filter", nvl_pfilter); } return (nvl_filed); } /* * 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. */ (void)pdkill(dq->dq_procdesc, SIGKILL); (void)deadq_remove(dq); break; case 1: if (pdkill(dq->dq_procdesc, SIGTERM) != 0) (void)deadq_remove(dq); else dq->dq_timeout--; break; default: dq->dq_timeout--; } } (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. */ static int waitdaemon(int maxwait) { struct pollfd pollfd; int events, pipefd[2], status; pid_t pid; if (pipe(pipefd) == -1) { warn("failed to daemonize, pipe"); die(0); } pid = fork(); if (pid == -1) { warn("failed to daemonize, fork"); die(0); } else if (pid > 0) { close(pipefd[1]); pollfd.fd = pipefd[0]; pollfd.events = POLLHUP; events = poll(&pollfd, 1, maxwait * 1000); if (events == -1) err(1, "failed to daemonize, poll"); else if (events == 0) errx(1, "timed out waiting for child"); if (waitpid(pid, &status, WNOHANG) > 0) { 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)" : ""); } exit(0); } close(pipefd[0]); if (setsid() == -1) { warn("failed to daemonize, setsid"); die(0); } (void)chdir("/"); (void)dup2(nulldesc, STDIN_FILENO); (void)dup2(nulldesc, STDOUT_FILENO); (void)dup2(nulldesc, STDERR_FILENO); return (pipefd[1]); } /* * 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 false on error, true if the argument was valid. */ static bool #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 = true; 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 = false; 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 (true); err: if (res != NULL) freeaddrinfo(res); free(ap); #endif return (false); } /* * Validate that the remote peer has permission to log to us. */ static bool 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; /* traditional behaviour, allow everything */ if (STAILQ_EMPTY(&aphead)) return (true); (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 (false); /* 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 (true); /* hooray! */ } return (false); } /* * Fairly similar to popen(3), but returns an open descriptor, as * opposed to a FILE *. * * Note: This function is wrapped by cap_p_open() when Capsicum support is * enabled, which allows piped processes to run outside of the capability * sandbox. */ int p_open(const char *prog, int *rpd) { struct sigaction act = { }; int pfd[2], pd; pid_t pid; char *argv[4]; /* sh -c cmd NULL */ if (pipe(pfd) == -1) return (-1); switch ((pid = pdfork(&pd, PD_CLOEXEC))) { case -1: 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) err(1, "strdup"); alarm(0); act.sa_handler = SIG_DFL; for (size_t i = 0; i < nitems(sigcatch); ++i) { if (sigaction(sigcatch[i], &act, NULL) == -1) err(1, "sigaction"); } 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(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. */ dprintf("Warning: cannot change pipe to PID %d to non-blocking" "behaviour.", pid); } *rpd = pd; return (pfd[1]); } static void deadq_enter(int pd) { struct deadq_entry *dq; if (pd == -1) return; dq = malloc(sizeof(*dq)); if (dq == NULL) { logerror("malloc"); exit(1); } dq->dq_procdesc = pd; dq->dq_timeout = DQ_TIMO_INIT; TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); } static void deadq_remove(struct deadq_entry *dq) { TAILQ_REMOVE(&deadq_head, dq, dq_entries); close(dq->dq_procdesc); free(dq); } static struct socklist * socksetup(struct addrinfo *ai, const char *name, mode_t mode) { struct socklist *sl; int (*sl_recv)(struct socklist *); int s, optval = 1; if (ai->ai_family != AF_LOCAL && SecureMode > 1) { /* Only AF_LOCAL in secure mode. */ return (NULL); } if (family != AF_UNSPEC && ai->ai_family != AF_LOCAL && ai->ai_family != family) return (NULL); s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); if (s < 0) { logerror("socket"); return (NULL); } #ifdef INET6 if (ai->ai_family == AF_INET6) { if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &optval, sizeof(int)) < 0) { logerror("setsockopt(IPV6_V6ONLY)"); close(s); return (NULL); } } #endif if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(int)) < 0) { logerror("setsockopt(SO_REUSEADDR)"); close(s); return (NULL); } /* * 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 (ai->ai_family == AF_LOCAL) unlink(name); if (ai->ai_family == AF_LOCAL || NoBind == 0 || name != NULL) { mode_t mask; int error; if (ai->ai_family == AF_LOCAL && fchmod(s, mode) < 0) { dprintf("fchmod %s: %s\n", name, strerror(errno)); close(s); return (NULL); } /* * For AF_LOCAL sockets, the process umask is applied to the * mode set above, so temporarily clear it to ensure that the * socket always has the correct permissions. */ mask = umask(0); error = bind(s, ai->ai_addr, ai->ai_addrlen); (void)umask(mask); if (error < 0) { logerror("bind"); close(s); return (NULL); } if (ai->ai_family == AF_LOCAL || SecureMode == 0) increase_rcvbuf(s); } dprintf("new socket fd is %d\n", s); sl_recv = socklist_recv_sock; #if defined(INET) || defined(INET6) if (SecureMode && (ai->ai_family == AF_INET || ai->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"); /* Copy *ai->ai_addr to the tail of struct socklist if any. */ sl = calloc(1, sizeof(*sl) + ai->ai_addrlen); if (sl == NULL) err(1, "malloc failed"); sl->sl_socket = s; if (ai->ai_family == AF_LOCAL) { char *name2 = strdup(name); if (name2 == NULL) err(1, "strdup failed"); sl->sl_name = strdup(basename(name2)); sl->sl_dirfd = open(dirname(name2), O_DIRECTORY); if (sl->sl_name == NULL || sl->sl_dirfd == -1) err(1, "failed to save dir info for %s", name); free(name2); } sl->sl_recv = sl_recv; (void)memcpy(&sl->sl_ai, ai, sizeof(*ai)); if (ai->ai_addrlen > 0) { (void)memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen); sl->sl_sa = (struct sockaddr *)(sl + 1); } else { sl->sl_sa = NULL; } return (sl); } 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)); } } }