syslogd.c revision 278437
11558Srgrimes/* 21558Srgrimes * Copyright (c) 1983, 1988, 1993, 1994 31558Srgrimes * The Regents of the University of California. All rights reserved. 41558Srgrimes * 51558Srgrimes * Redistribution and use in source and binary forms, with or without 61558Srgrimes * modification, are permitted provided that the following conditions 71558Srgrimes * are met: 81558Srgrimes * 1. Redistributions of source code must retain the above copyright 91558Srgrimes * notice, this list of conditions and the following disclaimer. 101558Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111558Srgrimes * notice, this list of conditions and the following disclaimer in the 121558Srgrimes * documentation and/or other materials provided with the distribution. 131558Srgrimes * 4. Neither the name of the University nor the names of its contributors 141558Srgrimes * may be used to endorse or promote products derived from this software 151558Srgrimes * without specific prior written permission. 161558Srgrimes * 171558Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181558Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191558Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201558Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211558Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221558Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231558Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241558Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251558Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261558Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271558Srgrimes * SUCH DAMAGE. 281558Srgrimes */ 291558Srgrimes 30114589Sobrien#ifndef lint 311558Srgrimesstatic const char copyright[] = 3238040Scharnier"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 331558Srgrimes The Regents of the University of California. All rights reserved.\n"; 341558Srgrimes#endif /* not lint */ 351558Srgrimes 361558Srgrimes#ifndef lint 371558Srgrimes#if 0 381558Srgrimesstatic char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39114589Sobrien#endif 4038040Scharnier#endif /* not lint */ 41114589Sobrien 42114589Sobrien#include <sys/cdefs.h> 431558Srgrimes__FBSDID("$FreeBSD: stable/10/usr.sbin/syslogd/syslogd.c 278437 2015-02-09 07:52:45Z dim $"); 441558Srgrimes 45102231Strhodes/* 461558Srgrimes * syslogd -- log system messages 471558Srgrimes * 4842873Sluoqi * This program implements a system log. It takes a series of lines. 4996478Sphk * Each line may have a priority, signified as "<n>" as 501558Srgrimes * the first characters of the line. If this is 511558Srgrimes * not present, a default priority is used. 5298542Smckusick * 5398542Smckusick * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 541558Srgrimes * cause it to reread its configuration file. 55207141Sjeff * 561558Srgrimes * Defined Constants: 57110174Sgordon * 581558Srgrimes * MAXLINE -- the maximum line length that can be handled. 591558Srgrimes * DEFUPRI -- the default priority for user messages 601558Srgrimes * DEFSPRI -- the default priority for kernel messages 61109597Sjmallett * 6238040Scharnier * Author: Eric Allman 631558Srgrimes * extensive changes by Ralph Campbell 641558Srgrimes * more extensive changes by Eric Allman (again) 65207141Sjeff * Extension to log by program name as well as facility and priority 6658047Ssheldonh * by Peter da Silva. 67226266Smckusick * -u and -v by Harlan Stenn. 681558Srgrimes * Priority comparison code by Harlan Stenn. 691558Srgrimes */ 701558Srgrimes 711558Srgrimes#define MAXLINE 1024 /* maximum line length */ 721558Srgrimes#define MAXSVLINE 120 /* maximum saved line length */ 73227081Sed#define DEFUPRI (LOG_USER|LOG_NOTICE) 74109597Sjmallett#define DEFSPRI (LOG_KERN|LOG_CRIT) 751558Srgrimes#define TIMERINTVL 30 /* interval for checking flush, mark */ 7692883Simp#define TTYMSGTIME 1 /* timeout passed to ttymsg */ 7792883Simp#define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 78207141Sjeff 79207141Sjeff#include <sys/param.h> 80207141Sjeff#include <sys/ioctl.h> 811558Srgrimes#include <sys/mman.h> 821558Srgrimes#include <sys/stat.h> 83109597Sjmallett#include <sys/wait.h> 841558Srgrimes#include <sys/socket.h> 85207141Sjeff#include <sys/queue.h> 86216798Skib#include <sys/uio.h> 87109963Sjmallett#include <sys/un.h> 8879750Sdd#include <sys/time.h> 89127455Sbde#include <sys/resource.h> 90207141Sjeff#include <sys/syslimits.h> 91207141Sjeff#include <sys/types.h> 92216798Skib 93229911Seadler#include <netinet/in.h> 94127441Sbde#include <netdb.h> 9579750Sdd#include <arpa/inet.h> 9642873Sluoqi 9742873Sluoqi#include <ctype.h> 981558Srgrimes#include <err.h> 99127441Sbde#include <errno.h> 100127441Sbde#include <fcntl.h> 101207141Sjeff#include <libutil.h> 102216798Skib#include <limits.h> 103207141Sjeff#include <paths.h> 104207141Sjeff#include <signal.h> 105127455Sbde#include <stdio.h> 106127441Sbde#include <stdlib.h> 107216798Skib#include <string.h> 108216798Skib#include <sysexits.h> 109127441Sbde#include <unistd.h> 110127441Sbde#include <utmpx.h> 111127441Sbde 112127441Sbde#include "pathnames.h" 113127441Sbde#include "ttymsg.h" 114127441Sbde 115127441Sbde#define SYSLOG_NAMES 116127441Sbde#include <sys/syslog.h> 117127441Sbde 118200796Straszconst char *ConfFile = _PATH_LOGCONF; 119127441Sbdeconst char *PidFile = _PATH_LOGPID; 120127441Sbdeconst char ctty[] = _PATH_CONSOLE; 121127441Sbde 122127441Sbde#define dprintf if (Debug) printf 123127441Sbde 124127441Sbde#define MAXUNAMES 20 /* maximum number of user names */ 125127441Sbde 126127441Sbde/* 127127441Sbde * Unix sockets. 128127441Sbde * We have two default sockets, one with 666 permissions, 129127441Sbde * and one for privileged programs. 130127441Sbde */ 131127441Sbdestruct funix { 132127441Sbde int s; 133127441Sbde const char *name; 134127441Sbde mode_t mode; 135127441Sbde STAILQ_ENTRY(funix) next; 136127441Sbde}; 137127441Sbdestruct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 138127441Sbde { NULL } }; 139127441Sbdestruct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 140127441Sbde { &funix_secure } }; 141127441Sbde 142127441SbdeSTAILQ_HEAD(, funix) funixes = { &funix_default, 143127441Sbde &(funix_secure.next.stqe_next) }; 144127441Sbde 145127441Sbde/* 146127441Sbde * Flags to logmsg(). 147127441Sbde */ 148207141Sjeff 149207141Sjeff#define IGN_CONS 0x001 /* don't print on console */ 150207141Sjeff#define SYNC_FILE 0x002 /* do fsync on file after printing */ 151207141Sjeff#define ADDDATE 0x004 /* add a date to the message */ 152207141Sjeff#define MARK 0x008 /* this message is a mark */ 153207141Sjeff#define ISKERNEL 0x010 /* kernel generated message */ 154207141Sjeff 155207141Sjeff/* 156207141Sjeff * This structure represents the files that will have log 157207141Sjeff * copies printed. 158207141Sjeff * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 159207141Sjeff * or if f_type if F_PIPE and f_pid > 0. 160163842Spjd */ 161163842Spjd 162163842Spjdstruct filed { 163163842Spjd struct filed *f_next; /* next in linked list */ 164163842Spjd short f_type; /* entry type, see below */ 165163842Spjd short f_file; /* file descriptor */ 166163842Spjd time_t f_time; /* time this was last written */ 167163842Spjd char *f_host; /* host from which to recd. */ 168163842Spjd u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 169163842Spjd u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 170163842Spjd#define PRI_LT 0x1 171163842Spjd#define PRI_EQ 0x2 172163842Spjd#define PRI_GT 0x4 173127441Sbde char *f_program; /* program this applies to */ 174127441Sbde union { 175127441Sbde char f_uname[MAXUNAMES][MAXLOGNAME]; 176127441Sbde struct { 177127441Sbde char f_hname[MAXHOSTNAMELEN]; 178127441Sbde struct addrinfo *f_addr; 179127441Sbde 180127441Sbde } f_forw; /* forwarding address */ 181127441Sbde char f_fname[MAXPATHLEN]; 182127441Sbde struct { 183127441Sbde char f_pname[MAXPATHLEN]; 184127441Sbde pid_t f_pid; 185127441Sbde } f_pipe; 186127441Sbde } f_un; 187127441Sbde char f_prevline[MAXSVLINE]; /* last message logged */ 188127441Sbde char f_lasttime[16]; /* time of last occurrence */ 189127441Sbde char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 190127441Sbde int f_prevpri; /* pri of f_prevline */ 191127441Sbde int f_prevlen; /* length of f_prevline */ 192127441Sbde int f_prevcount; /* repetition cnt of prevline */ 193127441Sbde u_int f_repeatcount; /* number of "repeated" msgs */ 194127441Sbde int f_flags; /* file-specific flags */ 195127441Sbde#define FFLAG_SYNC 0x01 196127441Sbde#define FFLAG_NEEDSYNC 0x02 197127441Sbde}; 198127441Sbde 199127441Sbde/* 200127441Sbde * Queue of about-to-be dead processes we should watch out for. 201127441Sbde */ 202127441Sbde 203127441SbdeTAILQ_HEAD(stailhead, deadq_entry) deadq_head; 204127441Sbdestruct stailhead *deadq_headp; 205127441Sbde 206127441Sbdestruct deadq_entry { 207127441Sbde pid_t dq_pid; 208127441Sbde int dq_timeout; 209127441Sbde TAILQ_ENTRY(deadq_entry) dq_entries; 210127441Sbde}; 211127441Sbde 212200796Strasz/* 213200796Strasz * The timeout to apply to processes waiting on the dead queue. Unit 214200796Strasz * of measure is `mark intervals', i.e. 20 minutes by default. 215200796Strasz * Processes on the dead queue will be terminated after that time. 216200796Strasz */ 217200796Strasz 218200796Strasz#define DQ_TIMO_INIT 2 219200796Strasz 220200796Strasztypedef struct deadq_entry *dq_t; 221200796Strasz 222200796Strasz 223200796Strasz/* 224127441Sbde * Struct to hold records of network addresses that are allowed to log 225127441Sbde * to us. 226127441Sbde */ 227127441Sbdestruct allowedpeer { 228127455Sbde int isnumeric; 229127455Sbde u_short port; 230127441Sbde union { 231127441Sbde struct { 232127441Sbde struct sockaddr_storage addr; 233127441Sbde struct sockaddr_storage mask; 234127441Sbde } numeric; 235127441Sbde char *name; 236127441Sbde } u; 237127441Sbde#define a_addr u.numeric.addr 238127441Sbde#define a_mask u.numeric.mask 239127455Sbde#define a_name u.name 240127441Sbde}; 241127455Sbde 242127441Sbde 243127441Sbde/* 244127441Sbde * Intervals at which we flush out "message repeated" messages, 245127441Sbde * in seconds after previous message is logged. After each flush, 246127441Sbde * we move to the next interval until we reach the largest. 247127441Sbde */ 248127441Sbdeint repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 249127441Sbde#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 250127441Sbde#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 251127441Sbde#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 252127441Sbde (f)->f_repeatcount = MAXREPEAT; \ 253127441Sbde } 254127441Sbde 255127441Sbde/* values for f_type */ 256127441Sbde#define F_UNUSED 0 /* unused entry */ 257127441Sbde#define F_FILE 1 /* regular file */ 258127441Sbde#define F_TTY 2 /* terminal */ 259127441Sbde#define F_CONSOLE 3 /* console terminal */ 260127441Sbde#define F_FORW 4 /* remote machine */ 261127441Sbde#define F_USERS 5 /* list of users */ 262127441Sbde#define F_WALL 6 /* everyone logged on */ 263127441Sbde#define F_PIPE 7 /* pipe to program */ 264127441Sbde 265207141Sjeffconst char *TypeNames[8] = { 266207141Sjeff "UNUSED", "FILE", "TTY", "CONSOLE", 267207141Sjeff "FORW", "USERS", "WALL", "PIPE" 268207141Sjeff}; 269207141Sjeff 270207141Sjeffstatic struct filed *Files; /* Log files that we write to */ 271207141Sjeffstatic struct filed consfile; /* Console */ 272207141Sjeff 273207141Sjeffstatic int Debug; /* debug flag */ 274216798Skibstatic int resolve = 1; /* resolve hostname */ 275216798Skibstatic char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 276216798Skibstatic const char *LocalDomain; /* our local domain name */ 277216798Skibstatic int *finet; /* Internet datagram socket */ 278216798Skibstatic int fklog = -1; /* /dev/klog */ 279216798Skibstatic int Initialized; /* set when we have initialized ourselves */ 280216798Skibstatic int MarkInterval = 20 * 60; /* interval between marks in seconds */ 281216798Skibstatic int MarkSeq; /* mark sequence number */ 282216798Skibstatic int NoBind; /* don't bind() as suggested by RFC 3164 */ 283216798Skibstatic int SecureMode; /* when true, receive only unix domain socks */ 284216798Skib#ifdef INET6 285216798Skibstatic int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 286127441Sbde#else 287127441Sbdestatic int family = PF_INET; /* protocol family (IPv4 only) */ 288105120Srwatson#endif 28969314Scharnierstatic int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 29069314Scharnierstatic int send_to_all; /* send message to all IPv4/IPv6 addresses */ 29169314Scharnierstatic int use_bootfile; /* log entire bootfile for every kern msg */ 292127441Sbdestatic int no_compress; /* don't compress messages (1=pipes, 2=all) */ 29369314Scharnierstatic int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 294109963Sjmallett 295109963Sjmallettstatic char bootfile[MAXLINE+1]; /* booted kernel file */ 296109963Sjmallett 297109963Sjmallettstruct allowedpeer *AllowedPeers; /* List of allowed peers */ 298207421Sjeffstatic int NumAllowed; /* Number of entries in AllowedPeers */ 299207421Sjeffstatic int RemoteAddDate; /* Always set the date on remote messages */ 300207421Sjeff 30169829Scharnierstatic int UniquePriority; /* Only log specified priority? */ 30269829Scharnierstatic int LogFacPri; /* Put facility and priority in log message: */ 30369829Scharnier /* 0=no, 1=numeric, 2=names */ 30469829Scharnierstatic int KeepKernFac; /* Keep remotely logged kernel facility */ 30569829Scharnierstatic int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 30669829Scharnierstatic struct pidfh *pfh; 30769829Scharnier 308110174Sgordonvolatile sig_atomic_t MarkSet, WantDie; 309110174Sgordon 310110174Sgordonstatic int allowaddr(char *); 311110174Sgordonstatic void cfline(const char *, struct filed *, 312105120Srwatson const char *, const char *); 313200796Straszstatic const char *cvthname(struct sockaddr *); 314105120Srwatsonstatic void deadq_enter(pid_t, const char *); 315105120Srwatsonstatic int deadq_remove(pid_t); 316105120Srwatsonstatic int decode(const char *, const CODE *); 317200796Straszstatic void die(int); 318200796Straszstatic void dodie(int); 319200796Straszstatic void dofsync(void); 320105120Srwatsonstatic void domark(int); 321105120Srwatsonstatic void fprintlog(struct filed *, int, const char *); 322105120Srwatsonstatic int *socksetup(int, char *); 323105120Srwatsonstatic void init(int); 324105120Srwatsonstatic void logerror(const char *); 325105120Srwatsonstatic void logmsg(int, const char *, const char *, int); 326105120Srwatsonstatic void log_deadchild(pid_t, int, const char *); 327105120Srwatsonstatic void markit(void); 328105120Srwatsonstatic int skip_message(const char *, const char *, int); 329105120Srwatsonstatic void printline(const char *, char *, int); 330105120Srwatsonstatic void printsys(char *); 331105206Srwatsonstatic int p_open(const char *, pid_t *); 332105120Srwatsonstatic void readklog(void); 333105120Srwatsonstatic void reapchild(int); 334105120Srwatsonstatic void usage(void); 33569829Scharnierstatic int validate(struct sockaddr *, const char *); 33669829Scharnierstatic void unmapped(struct sockaddr *); 337127455Sbdestatic void wallmsg(struct filed *, struct iovec *, const int iovlen); 33869829Scharnierstatic int waitdaemon(int, int, int); 33969829Scharnierstatic void timedout(int); 34069829Scharnierstatic void increase_rcvbuf(int); 341127455Sbde 34269829Scharnierint 34369829Scharniermain(int argc, char *argv[]) 34469829Scharnier{ 34575377Smckusick int ch, i, fdsrmax = 0, l; 34675377Smckusick struct sockaddr_un sunx, fromunix; 347203769Smckusick struct sockaddr_storage frominet; 34875377Smckusick fd_set *fdsr = NULL; 34975377Smckusick char line[MAXLINE + 1]; 35075377Smckusick char *bindhostname; 35175377Smckusick const char *hname; 35275377Smckusick struct timeval tv, *tvp; 35375377Smckusick struct sigaction sact; 35475377Smckusick struct funix *fx, *fx1; 35575377Smckusick sigset_t mask; 356207141Sjeff pid_t ppid = 1, spid; 357207141Sjeff socklen_t len; 358207141Sjeff 359207141Sjeff if (madvise(NULL, 0, MADV_PROTECT) != 0) 360207141Sjeff dprintf("madvise() failed: %s\n", strerror(errno)); 361207141Sjeff 362207141Sjeff bindhostname = NULL; 363207141Sjeff while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv")) 364207141Sjeff != -1) 365207141Sjeff switch (ch) { 366207141Sjeff case '4': 367207141Sjeff family = PF_INET; 368207141Sjeff break; 369207141Sjeff#ifdef INET6 370207141Sjeff case '6': 371207141Sjeff family = PF_INET6; 372207141Sjeff break; 373207141Sjeff#endif 374207141Sjeff case '8': 375207141Sjeff mask_C1 = 0; 376208241Sjeff break; 377207141Sjeff case 'A': 378208241Sjeff send_to_all++; 379208241Sjeff break; 380208241Sjeff case 'a': /* allow specific network addresses only */ 381208241Sjeff if (allowaddr(optarg) == -1) 382207141Sjeff usage(); 383207141Sjeff break; 384207141Sjeff case 'b': 385163842Spjd bindhostname = optarg; 386163842Spjd break; 387163842Spjd case 'c': 388163842Spjd no_compress++; 389163842Spjd break; 390163842Spjd case 'C': 391163842Spjd logflags |= O_CREAT; 392163842Spjd break; 393163842Spjd case 'd': /* debug */ 394163842Spjd Debug++; 395163842Spjd break; 396163842Spjd case 'f': /* configuration file */ 397163842Spjd ConfFile = optarg; 398163842Spjd break; 399163842Spjd case 'k': /* keep remote kern fac */ 400163842Spjd KeepKernFac = 1; 401163842Spjd break; 402163842Spjd case 'l': 403163842Spjd { 404163842Spjd long perml; 405105120Srwatson mode_t mode; 406105120Srwatson char *name, *ep; 407105120Srwatson 408105120Srwatson if (optarg[0] == '/') { 409105120Srwatson mode = DEFFILEMODE; 410105120Srwatson name = optarg; 411105120Srwatson } else if ((name = strchr(optarg, ':')) != NULL) { 412105120Srwatson *name++ = '\0'; 413105120Srwatson if (name[0] != '/') 414105120Srwatson errx(1, "socket name must be absolute " 415105120Srwatson "path"); 416105120Srwatson if (isdigit(*optarg)) { 417105120Srwatson perml = strtol(optarg, &ep, 8); 418105120Srwatson if (*ep || perml < 0 || 419105120Srwatson perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 420105120Srwatson errx(1, "invalid mode %s, exiting", 421105206Srwatson optarg); 422105120Srwatson mode = (mode_t )perml; 423105120Srwatson } else 424105120Srwatson errx(1, "invalid mode %s, exiting", 42569829Scharnier optarg); 42669829Scharnier } else /* doesn't begin with '/', and no ':' */ 427127455Sbde errx(1, "can't parse path %s", optarg); 42869829Scharnier 42969829Scharnier if (strlen(name) >= sizeof(sunx.sun_path)) 43069829Scharnier errx(1, "%s path too long, exiting", name); 43169829Scharnier if ((fx = malloc(sizeof(struct funix))) == NULL) 43269829Scharnier errx(1, "malloc failed"); 43369829Scharnier fx->s = -1; 43469829Scharnier fx->name = name; 43569829Scharnier fx->mode = mode; 43669829Scharnier STAILQ_INSERT_TAIL(&funixes, fx, next); 43769829Scharnier break; 43869829Scharnier } 439200796Strasz case 'm': /* mark interval */ 440200796Strasz MarkInterval = atoi(optarg) * 60; 441200796Strasz break; 442200796Strasz case 'N': 443200796Strasz NoBind = 1; 444200796Strasz SecureMode = 1; 445200796Strasz break; 446200796Strasz case 'n': 447200796Strasz resolve = 0; 448200796Strasz break; 449200796Strasz case 'o': 450200796Strasz use_bootfile = 1; 451200796Strasz break; 452200796Strasz case 'p': /* path */ 453200796Strasz if (strlen(optarg) >= sizeof(sunx.sun_path)) 454200796Strasz errx(1, "%s path too long, exiting", optarg); 455200796Strasz funix_default.name = optarg; 456200796Strasz break; 457200796Strasz case 'P': /* path for alt. PID */ 458200796Strasz PidFile = optarg; 459200796Strasz break; 460200796Strasz case 's': /* no network mode */ 461200796Strasz SecureMode++; 46269829Scharnier break; 46369829Scharnier case 'S': /* path for privileged originator */ 46469829Scharnier if (strlen(optarg) >= sizeof(sunx.sun_path)) 465127455Sbde errx(1, "%s path too long, exiting", optarg); 46669829Scharnier funix_secure.name = optarg; 467127455Sbde break; 46875498Smckusick case 'T': 46975498Smckusick RemoteAddDate = 1; 47069829Scharnier break; 47169829Scharnier case 'u': /* only log specified priority */ 47269829Scharnier UniquePriority++; 47369829Scharnier break; 47469829Scharnier case 'v': /* log facility and priority */ 475127455Sbde LogFacPri++; 47669829Scharnier break; 477127455Sbde default: 47869829Scharnier usage(); 47969829Scharnier } 48069829Scharnier if ((argc -= optind) != 0) 48169829Scharnier usage(); 48269829Scharnier 48369829Scharnier pfh = pidfile_open(PidFile, 0600, &spid); 48469829Scharnier if (pfh == NULL) { 48569829Scharnier if (errno == EEXIST) 48669829Scharnier errx(1, "syslogd already running, pid: %d", spid); 487127455Sbde warn("cannot open pid file"); 48869829Scharnier } 48969829Scharnier 49069829Scharnier if (!Debug) { 49169829Scharnier ppid = waitdaemon(0, 0, 30); 49269829Scharnier if (ppid < 0) { 49369829Scharnier warn("could not become daemon"); 494127455Sbde pidfile_remove(pfh); 49569829Scharnier exit(1); 496127455Sbde } 49769829Scharnier } else { 49869829Scharnier setlinebuf(stdout); 49969829Scharnier } 50075377Smckusick 50175377Smckusick if (NumAllowed) 502203769Smckusick endservent(); 50375377Smckusick 50475377Smckusick consfile.f_type = F_CONSOLE; 50575377Smckusick (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 50675377Smckusick sizeof(consfile.f_un.f_fname)); 50775377Smckusick (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 50875377Smckusick (void)signal(SIGTERM, dodie); 50975377Smckusick (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 51075377Smckusick (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 511216798Skib /* 512216798Skib * We don't want the SIGCHLD and SIGHUP handlers to interfere 513216798Skib * with each other; they are likely candidates for being called 514216798Skib * simultaneously (SIGHUP closes pipe descriptor, process dies, 515216798Skib * SIGCHLD happens). 516216798Skib */ 517216798Skib sigemptyset(&mask); 518216798Skib sigaddset(&mask, SIGHUP); 519216798Skib sact.sa_handler = reapchild; 520216798Skib sact.sa_mask = mask; 521216798Skib sact.sa_flags = SA_RESTART; 522216798Skib (void)sigaction(SIGCHLD, &sact, NULL); 523216798Skib (void)signal(SIGALRM, domark); 524216798Skib (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 525216798Skib (void)alarm(TIMERINTVL); 526216798Skib 527216798Skib TAILQ_INIT(&deadq_head); 528216798Skib 52969829Scharnier#ifndef SUN_LEN 530109963Sjmallett#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 531109963Sjmallett#endif 532109963Sjmallett STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 53342873Sluoqi (void)unlink(fx->name); 53442873Sluoqi memset(&sunx, 0, sizeof(sunx)); 535109963Sjmallett sunx.sun_family = AF_LOCAL; 53642873Sluoqi (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 53742873Sluoqi fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 538102231Strhodes if (fx->s < 0 || 53942873Sluoqi bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 5401558Srgrimes chmod(fx->name, fx->mode) < 0) { 541109963Sjmallett (void)snprintf(line, sizeof line, 542109963Sjmallett "cannot create %s", fx->name); 543109963Sjmallett logerror(line); 544109963Sjmallett dprintf("cannot create %s (%d)\n", fx->name, errno); 545109963Sjmallett if (fx == &funix_default || fx == &funix_secure) 5461558Srgrimes die(0); 5471558Srgrimes else { 5481558Srgrimes STAILQ_REMOVE(&funixes, fx, funix, next); 549207141Sjeff continue; 550207141Sjeff } 551207141Sjeff } 552207141Sjeff increase_rcvbuf(fx->s); 553207141Sjeff } 554207141Sjeff if (SecureMode <= 1) 555227081Sed finet = socksetup(family, bindhostname); 556207141Sjeff 557207141Sjeff if (finet) { 558207141Sjeff if (SecureMode) { 559207141Sjeff for (i = 0; i < *finet; i++) { 560207141Sjeff if (shutdown(finet[i+1], SHUT_RD) < 0) { 561207141Sjeff logerror("shutdown"); 562207141Sjeff if (!Debug) 563207141Sjeff die(0); 564207141Sjeff } 565207141Sjeff } 566207141Sjeff } else { 567207141Sjeff dprintf("listening on inet and/or inet6 socket\n"); 568207141Sjeff } 569207141Sjeff dprintf("sending on inet and/or inet6 socket\n"); 570207141Sjeff } 571207141Sjeff 572207141Sjeff if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 573207141Sjeff if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 574207141Sjeff fklog = -1; 575207141Sjeff if (fklog < 0) 576207141Sjeff dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 577207141Sjeff 578207141Sjeff /* tuck my process id away */ 579207141Sjeff pidfile_write(pfh); 580207141Sjeff 581207141Sjeff dprintf("off & running....\n"); 582207141Sjeff 583207141Sjeff init(0); 584208241Sjeff /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 585207141Sjeff sigemptyset(&mask); 586207141Sjeff sigaddset(&mask, SIGCHLD); 587207141Sjeff sact.sa_handler = init; 588207141Sjeff sact.sa_mask = mask; 589207141Sjeff sact.sa_flags = SA_RESTART; 590207141Sjeff (void)sigaction(SIGHUP, &sact, NULL); 591207141Sjeff 592207141Sjeff tvp = &tv; 593207141Sjeff tv.tv_sec = tv.tv_usec = 0; 594207141Sjeff 595207141Sjeff if (fklog != -1 && fklog > fdsrmax) 596207141Sjeff fdsrmax = fklog; 597207141Sjeff if (finet && !SecureMode) { 598207141Sjeff for (i = 0; i < *finet; i++) { 599207141Sjeff if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 600207141Sjeff fdsrmax = finet[i+1]; 601207141Sjeff } 602207141Sjeff } 603207141Sjeff STAILQ_FOREACH(fx, &funixes, next) 604207141Sjeff if (fx->s > fdsrmax) 605207141Sjeff fdsrmax = fx->s; 606207141Sjeff 607207141Sjeff fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 608207141Sjeff sizeof(fd_mask)); 609207141Sjeff if (fdsr == NULL) 610207141Sjeff errx(1, "calloc fd_set"); 611207141Sjeff 612207141Sjeff for (;;) { 613207141Sjeff if (MarkSet) 614207141Sjeff markit(); 615207141Sjeff if (WantDie) 616207141Sjeff die(WantDie); 617207141Sjeff 618207141Sjeff bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 619207141Sjeff sizeof(fd_mask)); 620207141Sjeff 621207141Sjeff if (fklog != -1) 622207141Sjeff FD_SET(fklog, fdsr); 623207141Sjeff if (finet && !SecureMode) { 624207141Sjeff for (i = 0; i < *finet; i++) { 625207141Sjeff if (finet[i+1] != -1) 626207141Sjeff FD_SET(finet[i+1], fdsr); 627207141Sjeff } 628207141Sjeff } 629207141Sjeff STAILQ_FOREACH(fx, &funixes, next) 630207141Sjeff FD_SET(fx->s, fdsr); 631207141Sjeff 632207141Sjeff i = select(fdsrmax+1, fdsr, NULL, NULL, 633207141Sjeff needdofsync ? &tv : tvp); 634207141Sjeff switch (i) { 635207141Sjeff case 0: 636207141Sjeff dofsync(); 637207141Sjeff needdofsync = 0; 638207141Sjeff if (tvp) { 639207141Sjeff tvp = NULL; 640207141Sjeff if (ppid != 1) 641207141Sjeff kill(ppid, SIGALRM); 642207141Sjeff } 643207141Sjeff continue; 644207141Sjeff case -1: 645207141Sjeff if (errno != EINTR) 646207141Sjeff logerror("select"); 647207141Sjeff continue; 648207141Sjeff } 649207141Sjeff if (fklog != -1 && FD_ISSET(fklog, fdsr)) 650207141Sjeff readklog(); 651207141Sjeff if (finet && !SecureMode) { 652207141Sjeff for (i = 0; i < *finet; i++) { 653207141Sjeff if (FD_ISSET(finet[i+1], fdsr)) { 654207141Sjeff len = sizeof(frominet); 655207141Sjeff l = recvfrom(finet[i+1], line, MAXLINE, 656207141Sjeff 0, (struct sockaddr *)&frominet, 657207141Sjeff &len); 658207141Sjeff if (l > 0) { 659207141Sjeff line[l] = '\0'; 660207141Sjeff hname = cvthname((struct sockaddr *)&frominet); 661207141Sjeff unmapped((struct sockaddr *)&frominet); 662207141Sjeff if (validate((struct sockaddr *)&frominet, hname)) 663207141Sjeff printline(hname, line, RemoteAddDate ? ADDDATE : 0); 664207141Sjeff } else if (l < 0 && errno != EINTR) 665207141Sjeff logerror("recvfrom inet"); 666207141Sjeff } 667207141Sjeff } 668207141Sjeff } 669207141Sjeff STAILQ_FOREACH(fx, &funixes, next) { 670207141Sjeff if (FD_ISSET(fx->s, fdsr)) { 671207141Sjeff len = sizeof(fromunix); 672207141Sjeff l = recvfrom(fx->s, line, MAXLINE, 0, 673207141Sjeff (struct sockaddr *)&fromunix, &len); 674207141Sjeff if (l > 0) { 675207141Sjeff line[l] = '\0'; 676207141Sjeff printline(LocalHostName, line, 0); 677207141Sjeff } else if (l < 0 && errno != EINTR) 678207141Sjeff logerror("recvfrom unix"); 679207141Sjeff } 680207141Sjeff } 681207141Sjeff } 682207141Sjeff if (fdsr) 683207141Sjeff free(fdsr); 684207141Sjeff} 685207141Sjeff 686207141Sjeffstatic void 687207141Sjeffunmapped(struct sockaddr *sa) 688207141Sjeff{ 689207141Sjeff struct sockaddr_in6 *sin6; 690207141Sjeff struct sockaddr_in sin4; 691218603Skib 692218603Skib if (sa->sa_family != AF_INET6) 693218603Skib return; 694218603Skib if (sa->sa_len != sizeof(struct sockaddr_in6) || 695218603Skib sizeof(sin4) > sa->sa_len) 696218603Skib return; 697218603Skib sin6 = (struct sockaddr_in6 *)sa; 698218603Skib if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 699218603Skib return; 700218603Skib 701218603Skib memset(&sin4, 0, sizeof(sin4)); 702218603Skib sin4.sin_family = AF_INET; 703218603Skib sin4.sin_len = sizeof(struct sockaddr_in); 704207141Sjeff memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 705207141Sjeff sizeof(sin4.sin_addr)); 706207141Sjeff sin4.sin_port = sin6->sin6_port; 707207141Sjeff 708207141Sjeff memcpy(sa, &sin4, sin4.sin_len); 709207141Sjeff} 710207141Sjeff 711207141Sjeffstatic void 712207141Sjeffusage(void) 713207141Sjeff{ 714207141Sjeff 715207141Sjeff fprintf(stderr, "%s\n%s\n%s\n%s\n", 716207141Sjeff "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", 717207141Sjeff " [-b bind_address] [-f config_file]", 718207141Sjeff " [-l [mode:]path] [-m mark_interval]", 719207141Sjeff " [-P pid_file] [-p log_socket]"); 720207141Sjeff exit(1); 721207141Sjeff} 722207141Sjeff 723207141Sjeff/* 724207141Sjeff * Take a raw input line, decode the message, and print the message 725207141Sjeff * on the appropriate log files. 726218603Skib */ 727207141Sjeffstatic void 728207141Sjeffprintline(const char *hname, char *msg, int flags) 729207141Sjeff{ 730207141Sjeff char *p, *q; 731207141Sjeff long n; 732207141Sjeff int c, pri; 733207141Sjeff char line[MAXLINE + 1]; 734207141Sjeff 735207141Sjeff /* test for special codes */ 736207141Sjeff p = msg; 737207141Sjeff pri = DEFUPRI; 738207141Sjeff if (*p == '<') { 739207141Sjeff errno = 0; 740207141Sjeff n = strtol(p + 1, &q, 10); 741207141Sjeff if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 742207141Sjeff p = q + 1; 743218603Skib pri = n; 744218603Skib } 745207141Sjeff } 746207141Sjeff if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 747207141Sjeff pri = DEFUPRI; 748218603Skib 749218603Skib /* 750218603Skib * Don't allow users to log kernel messages. 751207141Sjeff * NOTE: since LOG_KERN == 0 this will also match 752207141Sjeff * messages with no facility specified. 753207141Sjeff */ 754207141Sjeff if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 755218603Skib pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 756207141Sjeff 757207141Sjeff q = line; 758207141Sjeff 759207141Sjeff while ((c = (unsigned char)*p++) != '\0' && 760207141Sjeff q < &line[sizeof(line) - 4]) { 761207141Sjeff if (mask_C1 && (c & 0x80) && c < 0xA0) { 762207141Sjeff c &= 0x7F; 763207141Sjeff *q++ = 'M'; 764207141Sjeff *q++ = '-'; 765207141Sjeff } 766207141Sjeff if (isascii(c) && iscntrl(c)) { 767207141Sjeff if (c == '\n') { 768207141Sjeff *q++ = ' '; 769207141Sjeff } else if (c == '\t') { 770207141Sjeff *q++ = '\t'; 771207141Sjeff } else { 772207141Sjeff *q++ = '^'; 773207141Sjeff *q++ = c ^ 0100; 774207141Sjeff } 775207141Sjeff } else { 776207141Sjeff *q++ = c; 777207141Sjeff } 778207141Sjeff } 779207141Sjeff *q = '\0'; 780207141Sjeff 781207141Sjeff logmsg(pri, line, hname, flags); 782207141Sjeff} 783207141Sjeff 784207141Sjeff/* 785207141Sjeff * Read /dev/klog while data are available, split into lines. 786207141Sjeff */ 787207141Sjeffstatic void 788207141Sjeffreadklog(void) 789207141Sjeff{ 790207141Sjeff char *p, *q, line[MAXLINE + 1]; 791207141Sjeff int len, i; 792207141Sjeff 793207141Sjeff len = 0; 794207141Sjeff for (;;) { 795207141Sjeff i = read(fklog, line + len, MAXLINE - 1 - len); 796207141Sjeff if (i > 0) { 797207141Sjeff line[i + len] = '\0'; 798207141Sjeff } else { 799207141Sjeff if (i < 0 && errno != EINTR && errno != EAGAIN) { 800207141Sjeff logerror("klog"); 801207141Sjeff fklog = -1; 802207141Sjeff } 803207141Sjeff break; 804207141Sjeff } 805207141Sjeff 806207141Sjeff for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 807207141Sjeff *q = '\0'; 808207141Sjeff printsys(p); 809207141Sjeff } 810207141Sjeff len = strlen(p); 811207141Sjeff if (len >= MAXLINE - 1) { 812207141Sjeff printsys(p); 813207141Sjeff len = 0; 814207141Sjeff } 815207141Sjeff if (len > 0) 816207141Sjeff memmove(line, p, len + 1); 817207141Sjeff } 818207141Sjeff if (len > 0) 819207141Sjeff printsys(line); 820207141Sjeff} 821207141Sjeff 822207141Sjeff/* 823207141Sjeff * Take a raw input line from /dev/klog, format similar to syslog(). 824207141Sjeff */ 825207141Sjeffstatic void 826207141Sjeffprintsys(char *msg) 827207141Sjeff{ 828207141Sjeff char *p, *q; 829207141Sjeff long n; 830207141Sjeff int flags, isprintf, pri; 831207141Sjeff 832207141Sjeff flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 833207141Sjeff p = msg; 834207141Sjeff pri = DEFSPRI; 835207141Sjeff isprintf = 1; 836207141Sjeff if (*p == '<') { 837207141Sjeff errno = 0; 838207141Sjeff n = strtol(p + 1, &q, 10); 839207141Sjeff if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 840207141Sjeff p = q + 1; 841207141Sjeff pri = n; 842207141Sjeff isprintf = 0; 843207141Sjeff } 844207141Sjeff } 845207141Sjeff /* 846207141Sjeff * Kernel printf's and LOG_CONSOLE messages have been displayed 847207141Sjeff * on the console already. 848207141Sjeff */ 849207141Sjeff if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 850207141Sjeff flags |= IGN_CONS; 851207141Sjeff if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 852207141Sjeff pri = DEFSPRI; 853207141Sjeff logmsg(pri, p, LocalHostName, flags); 854207141Sjeff} 855207141Sjeff 856207141Sjeffstatic time_t now; 857207141Sjeff 858207141Sjeff/* 859207141Sjeff * Match a program or host name against a specification. 860207141Sjeff * Return a non-0 value if the message must be ignored 861207141Sjeff * based on the specification. 862207141Sjeff */ 863207141Sjeffstatic int 864207141Sjeffskip_message(const char *name, const char *spec, int checkcase) 865207141Sjeff{ 866207141Sjeff const char *s; 867207141Sjeff char prev, next; 868207141Sjeff int exclude = 0; 869207141Sjeff /* Behaviour on explicit match */ 870207141Sjeff 871207141Sjeff if (spec == NULL) 872207141Sjeff return 0; 873207141Sjeff switch (*spec) { 874207141Sjeff case '-': 875207141Sjeff exclude = 1; 876207141Sjeff /*FALLTHROUGH*/ 877207141Sjeff case '+': 878207141Sjeff spec++; 879207141Sjeff break; 880207141Sjeff default: 881207141Sjeff break; 882207141Sjeff } 883207141Sjeff if (checkcase) 884207141Sjeff s = strstr (spec, name); 885207141Sjeff else 886207141Sjeff s = strcasestr (spec, name); 887207141Sjeff 888207141Sjeff if (s != NULL) { 889207141Sjeff prev = (s == spec ? ',' : *(s - 1)); 890207141Sjeff next = *(s + strlen (name)); 891207141Sjeff 892207141Sjeff if (prev == ',' && (next == '\0' || next == ',')) 893207141Sjeff /* Explicit match: skip iff the spec is an 894207141Sjeff exclusive one. */ 895207141Sjeff return exclude; 896207141Sjeff } 897207141Sjeff 898207141Sjeff /* No explicit match for this name: skip the message iff 899207141Sjeff the spec is an inclusive one. */ 900207141Sjeff return !exclude; 901207141Sjeff} 902207141Sjeff 903207141Sjeff/* 904207141Sjeff * Log a message to the appropriate log files, users, etc. based on 905207141Sjeff * the priority. 906207141Sjeff */ 907207141Sjeffstatic void 908207141Sjefflogmsg(int pri, const char *msg, const char *from, int flags) 909207141Sjeff{ 910207141Sjeff struct filed *f; 911207141Sjeff int i, fac, msglen, omask, prilev; 912207141Sjeff const char *timestamp; 913207141Sjeff char prog[NAME_MAX+1]; 914207141Sjeff char buf[MAXLINE+1]; 915207141Sjeff 916207141Sjeff dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 917207141Sjeff pri, flags, from, msg); 918207141Sjeff 919207141Sjeff omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 920207141Sjeff 921207141Sjeff /* 922207141Sjeff * Check to see if msg looks non-standard. 923207141Sjeff */ 924207141Sjeff msglen = strlen(msg); 925207141Sjeff if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 926226266Smckusick msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 927207141Sjeff flags |= ADDDATE; 928207141Sjeff 929207141Sjeff (void)time(&now); 930207141Sjeff if (flags & ADDDATE) { 931207141Sjeff timestamp = ctime(&now) + 4; 932207141Sjeff } else { 933207141Sjeff timestamp = msg; 934207141Sjeff msg += 16; 935207141Sjeff msglen -= 16; 936207141Sjeff } 937207141Sjeff 938207141Sjeff /* skip leading blanks */ 939207141Sjeff while (isspace(*msg)) { 940207141Sjeff msg++; 941207141Sjeff msglen--; 942207141Sjeff } 943207141Sjeff 944207141Sjeff /* extract facility and priority level */ 945207141Sjeff if (flags & MARK) 946207141Sjeff fac = LOG_NFACILITIES; 947207141Sjeff else 948207141Sjeff fac = LOG_FAC(pri); 949207141Sjeff 950207141Sjeff /* Check maximum facility number. */ 951207141Sjeff if (fac > LOG_NFACILITIES) { 952207141Sjeff (void)sigsetmask(omask); 953207141Sjeff return; 954207141Sjeff } 955208241Sjeff 956208241Sjeff prilev = LOG_PRI(pri); 957207141Sjeff 958207141Sjeff /* extract program name */ 959207141Sjeff for (i = 0; i < NAME_MAX; i++) { 960207141Sjeff if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 961207141Sjeff msg[i] == '/' || isspace(msg[i])) 962207141Sjeff break; 963207141Sjeff prog[i] = msg[i]; 964207141Sjeff } 965207141Sjeff prog[i] = 0; 966207141Sjeff 967207141Sjeff /* add kernel prefix for kernel messages */ 968207141Sjeff if (flags & ISKERNEL) { 969207141Sjeff snprintf(buf, sizeof(buf), "%s: %s", 970207141Sjeff use_bootfile ? bootfile : "kernel", msg); 971207141Sjeff msg = buf; 972207141Sjeff msglen = strlen(buf); 973207141Sjeff } 974207141Sjeff 975207141Sjeff /* log the message to the particular outputs */ 976207141Sjeff if (!Initialized) { 977207141Sjeff f = &consfile; 978207141Sjeff /* 979207141Sjeff * Open in non-blocking mode to avoid hangs during open 980207141Sjeff * and close(waiting for the port to drain). 981207141Sjeff */ 982207141Sjeff f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 983207141Sjeff 984207141Sjeff if (f->f_file >= 0) { 985207141Sjeff (void)strlcpy(f->f_lasttime, timestamp, 986207141Sjeff sizeof(f->f_lasttime)); 987226266Smckusick fprintlog(f, flags, msg); 988207141Sjeff (void)close(f->f_file); 989207141Sjeff } 990207141Sjeff (void)sigsetmask(omask); 991207141Sjeff return; 992207141Sjeff } 993207141Sjeff for (f = Files; f; f = f->f_next) { 994226266Smckusick /* skip messages that are incorrect priority */ 995226266Smckusick if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 996226266Smckusick ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 997207141Sjeff ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 998207141Sjeff ) 999207141Sjeff || f->f_pmask[fac] == INTERNAL_NOPRI) 1000207141Sjeff continue; 1001207141Sjeff 1002207141Sjeff /* skip messages with the incorrect hostname */ 1003226266Smckusick if (skip_message(from, f->f_host, 0)) 1004226266Smckusick continue; 1005226266Smckusick 1006226266Smckusick /* skip messages with the incorrect program name */ 1007207141Sjeff if (skip_message(prog, f->f_program, 1)) 1008207141Sjeff continue; 1009207141Sjeff 1010207141Sjeff /* skip message to console if it has already been printed */ 1011207141Sjeff if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1012207141Sjeff continue; 1013207141Sjeff 1014207141Sjeff /* don't output marks to recently written files */ 1015207141Sjeff if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1016207141Sjeff continue; 1017207141Sjeff 1018207141Sjeff /* 1019207141Sjeff * suppress duplicate lines to this file 1020207141Sjeff */ 1021207141Sjeff if (no_compress - (f->f_type != F_PIPE) < 1 && 1022207141Sjeff (flags & MARK) == 0 && msglen == f->f_prevlen && 1023207141Sjeff !strcmp(msg, f->f_prevline) && 1024207141Sjeff !strcasecmp(from, f->f_prevhost)) { 1025207141Sjeff (void)strlcpy(f->f_lasttime, timestamp, 1026207141Sjeff sizeof(f->f_lasttime)); 1027207141Sjeff f->f_prevcount++; 1028207141Sjeff dprintf("msg repeated %d times, %ld sec of %d\n", 1029207141Sjeff f->f_prevcount, (long)(now - f->f_time), 1030207141Sjeff repeatinterval[f->f_repeatcount]); 1031207141Sjeff /* 1032207141Sjeff * If domark would have logged this by now, 1033207141Sjeff * flush it now (so we don't hold isolated messages), 1034207141Sjeff * but back off so we'll flush less often 1035207141Sjeff * in the future. 1036207141Sjeff */ 1037207141Sjeff if (now > REPEATTIME(f)) { 1038207141Sjeff fprintlog(f, flags, (char *)NULL); 1039207141Sjeff BACKOFF(f); 1040207141Sjeff } 1041207141Sjeff } else { 1042207141Sjeff /* new line, save it */ 1043207141Sjeff if (f->f_prevcount) 1044207141Sjeff fprintlog(f, 0, (char *)NULL); 1045207141Sjeff f->f_repeatcount = 0; 1046207141Sjeff f->f_prevpri = pri; 1047207141Sjeff (void)strlcpy(f->f_lasttime, timestamp, 1048207141Sjeff sizeof(f->f_lasttime)); 1049207141Sjeff (void)strlcpy(f->f_prevhost, from, 1050207141Sjeff sizeof(f->f_prevhost)); 1051207141Sjeff if (msglen < MAXSVLINE) { 1052207141Sjeff f->f_prevlen = msglen; 1053207141Sjeff (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1054207141Sjeff fprintlog(f, flags, (char *)NULL); 1055207141Sjeff } else { 1056207141Sjeff f->f_prevline[0] = 0; 1057207141Sjeff f->f_prevlen = 0; 1058207141Sjeff fprintlog(f, flags, msg); 1059207141Sjeff } 1060207141Sjeff } 1061207141Sjeff } 1062207141Sjeff (void)sigsetmask(omask); 1063207141Sjeff} 1064109597Sjmallett 10651558Srgrimesstatic void 1066216798Skibdofsync(void) 1067111287Sru{ 1068207462Sedwin struct filed *f; 1069207462Sedwin 1070207462Sedwin for (f = Files; f; f = f->f_next) { 1071216798Skib if ((f->f_type == F_FILE) && 1072216798Skib (f->f_flags & FFLAG_NEEDSYNC)) { 10731558Srgrimes f->f_flags &= ~FFLAG_NEEDSYNC; 10741558Srgrimes (void)fsync(f->f_file); 10751558Srgrimes } 10761558Srgrimes } 1077109597Sjmallett} 10781558Srgrimes 1079200796Strasz#define IOV_SIZE 7 1080105162Srwatsonstatic void 1081200796Straszfprintlog(struct filed *f, int flags, const char *msg) 1082200796Strasz{ 1083105162Srwatson struct iovec iov[IOV_SIZE]; 1084105162Srwatson struct iovec *v; 1085109468Sjmallett struct addrinfo *r; 108634266Sjulian int i, l, lsent = 0; 1087207141Sjeff char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1088207141Sjeff char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1089163842Spjd const char *msgret; 1090163842Spjd 1091216798Skib v = iov; 1092216798Skib if (f->f_type == F_WALL) { 10939315Sjoerg v->iov_base = greetings; 10949315Sjoerg /* The time displayed is not synchornized with the other log 109575377Smckusick * destinations (like messages). Following fragment was using 109675377Smckusick * ctime(&now), which was updating the time every 30 sec. 109775377Smckusick * With f_lasttime, time is synchronized correctly. 109875377Smckusick */ 10999315Sjoerg v->iov_len = snprintf(greetings, sizeof greetings, 11009315Sjoerg "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 11019315Sjoerg f->f_prevhost, f->f_lasttime); 11029315Sjoerg if (v->iov_len >= sizeof greetings) 11039315Sjoerg v->iov_len = sizeof greetings - 1; 11049315Sjoerg v++; 11059315Sjoerg v->iov_base = nul; 11069315Sjoerg v->iov_len = 0; 11079315Sjoerg v++; 11089315Sjoerg } else { 1109110174Sgordon v->iov_base = f->f_lasttime; 1110110174Sgordon v->iov_len = strlen(f->f_lasttime); 11119315Sjoerg v++; 1112 v->iov_base = space; 1113 v->iov_len = 1; 1114 v++; 1115 } 1116 1117 if (LogFacPri) { 1118 static char fp_buf[30]; /* Hollow laugh */ 1119 int fac = f->f_prevpri & LOG_FACMASK; 1120 int pri = LOG_PRI(f->f_prevpri); 1121 const char *f_s = NULL; 1122 char f_n[5]; /* Hollow laugh */ 1123 const char *p_s = NULL; 1124 char p_n[5]; /* Hollow laugh */ 1125 1126 if (LogFacPri > 1) { 1127 const CODE *c; 1128 1129 for (c = facilitynames; c->c_name; c++) { 1130 if (c->c_val == fac) { 1131 f_s = c->c_name; 1132 break; 1133 } 1134 } 1135 for (c = prioritynames; c->c_name; c++) { 1136 if (c->c_val == pri) { 1137 p_s = c->c_name; 1138 break; 1139 } 1140 } 1141 } 1142 if (!f_s) { 1143 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1144 f_s = f_n; 1145 } 1146 if (!p_s) { 1147 snprintf(p_n, sizeof p_n, "%d", pri); 1148 p_s = p_n; 1149 } 1150 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1151 v->iov_base = fp_buf; 1152 v->iov_len = strlen(fp_buf); 1153 } else { 1154 v->iov_base = nul; 1155 v->iov_len = 0; 1156 } 1157 v++; 1158 1159 v->iov_base = f->f_prevhost; 1160 v->iov_len = strlen(v->iov_base); 1161 v++; 1162 v->iov_base = space; 1163 v->iov_len = 1; 1164 v++; 1165 1166 if (msg) { 1167 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1168 if (wmsg == NULL) { 1169 logerror("strdup"); 1170 exit(1); 1171 } 1172 v->iov_base = wmsg; 1173 v->iov_len = strlen(msg); 1174 } else if (f->f_prevcount > 1) { 1175 v->iov_base = repbuf; 1176 v->iov_len = snprintf(repbuf, sizeof repbuf, 1177 "last message repeated %d times", f->f_prevcount); 1178 } else { 1179 v->iov_base = f->f_prevline; 1180 v->iov_len = f->f_prevlen; 1181 } 1182 v++; 1183 1184 dprintf("Logging to %s", TypeNames[f->f_type]); 1185 f->f_time = now; 1186 1187 switch (f->f_type) { 1188 int port; 1189 case F_UNUSED: 1190 dprintf("\n"); 1191 break; 1192 1193 case F_FORW: 1194 port = (int)ntohs(((struct sockaddr_in *) 1195 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1196 if (port != 514) { 1197 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1198 } else { 1199 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1200 } 1201 /* check for local vs remote messages */ 1202 if (strcasecmp(f->f_prevhost, LocalHostName)) 1203 l = snprintf(line, sizeof line - 1, 1204 "<%d>%.15s Forwarded from %s: %s", 1205 f->f_prevpri, (char *)iov[0].iov_base, 1206 f->f_prevhost, (char *)iov[5].iov_base); 1207 else 1208 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1209 f->f_prevpri, (char *)iov[0].iov_base, 1210 (char *)iov[5].iov_base); 1211 if (l < 0) 1212 l = 0; 1213 else if (l > MAXLINE) 1214 l = MAXLINE; 1215 1216 if (finet) { 1217 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1218 for (i = 0; i < *finet; i++) { 1219#if 0 1220 /* 1221 * should we check AF first, or just 1222 * trial and error? FWD 1223 */ 1224 if (r->ai_family == 1225 address_family_of(finet[i+1])) 1226#endif 1227 lsent = sendto(finet[i+1], line, l, 0, 1228 r->ai_addr, r->ai_addrlen); 1229 if (lsent == l) 1230 break; 1231 } 1232 if (lsent == l && !send_to_all) 1233 break; 1234 } 1235 dprintf("lsent/l: %d/%d\n", lsent, l); 1236 if (lsent != l) { 1237 int e = errno; 1238 logerror("sendto"); 1239 errno = e; 1240 switch (errno) { 1241 case ENOBUFS: 1242 case ENETDOWN: 1243 case ENETUNREACH: 1244 case EHOSTUNREACH: 1245 case EHOSTDOWN: 1246 case EADDRNOTAVAIL: 1247 break; 1248 /* case EBADF: */ 1249 /* case EACCES: */ 1250 /* case ENOTSOCK: */ 1251 /* case EFAULT: */ 1252 /* case EMSGSIZE: */ 1253 /* case EAGAIN: */ 1254 /* case ENOBUFS: */ 1255 /* case ECONNREFUSED: */ 1256 default: 1257 dprintf("removing entry: errno=%d\n", e); 1258 f->f_type = F_UNUSED; 1259 break; 1260 } 1261 } 1262 } 1263 break; 1264 1265 case F_FILE: 1266 dprintf(" %s\n", f->f_un.f_fname); 1267 v->iov_base = lf; 1268 v->iov_len = 1; 1269 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1270 /* 1271 * If writev(2) fails for potentially transient errors 1272 * like the filesystem being full, ignore it. 1273 * Otherwise remove this logfile from the list. 1274 */ 1275 if (errno != ENOSPC) { 1276 int e = errno; 1277 (void)close(f->f_file); 1278 f->f_type = F_UNUSED; 1279 errno = e; 1280 logerror(f->f_un.f_fname); 1281 } 1282 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1283 f->f_flags |= FFLAG_NEEDSYNC; 1284 needdofsync = 1; 1285 } 1286 break; 1287 1288 case F_PIPE: 1289 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1290 v->iov_base = lf; 1291 v->iov_len = 1; 1292 if (f->f_un.f_pipe.f_pid == 0) { 1293 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1294 &f->f_un.f_pipe.f_pid)) < 0) { 1295 f->f_type = F_UNUSED; 1296 logerror(f->f_un.f_pipe.f_pname); 1297 break; 1298 } 1299 } 1300 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1301 int e = errno; 1302 (void)close(f->f_file); 1303 if (f->f_un.f_pipe.f_pid > 0) 1304 deadq_enter(f->f_un.f_pipe.f_pid, 1305 f->f_un.f_pipe.f_pname); 1306 f->f_un.f_pipe.f_pid = 0; 1307 errno = e; 1308 logerror(f->f_un.f_pipe.f_pname); 1309 } 1310 break; 1311 1312 case F_CONSOLE: 1313 if (flags & IGN_CONS) { 1314 dprintf(" (ignored)\n"); 1315 break; 1316 } 1317 /* FALLTHROUGH */ 1318 1319 case F_TTY: 1320 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1321 v->iov_base = crlf; 1322 v->iov_len = 2; 1323 1324 errno = 0; /* ttymsg() only sometimes returns an errno */ 1325 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1326 f->f_type = F_UNUSED; 1327 logerror(msgret); 1328 } 1329 break; 1330 1331 case F_USERS: 1332 case F_WALL: 1333 dprintf("\n"); 1334 v->iov_base = crlf; 1335 v->iov_len = 2; 1336 wallmsg(f, iov, IOV_SIZE); 1337 break; 1338 } 1339 f->f_prevcount = 0; 1340 free(wmsg); 1341} 1342 1343/* 1344 * WALLMSG -- Write a message to the world at large 1345 * 1346 * Write the specified message to either the entire 1347 * world, or a list of approved users. 1348 */ 1349static void 1350wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1351{ 1352 static int reenter; /* avoid calling ourselves */ 1353 struct utmpx *ut; 1354 int i; 1355 const char *p; 1356 1357 if (reenter++) 1358 return; 1359 setutxent(); 1360 /* NOSTRICT */ 1361 while ((ut = getutxent()) != NULL) { 1362 if (ut->ut_type != USER_PROCESS) 1363 continue; 1364 if (f->f_type == F_WALL) { 1365 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1366 TTYMSGTIME)) != NULL) { 1367 errno = 0; /* already in msg */ 1368 logerror(p); 1369 } 1370 continue; 1371 } 1372 /* should we send the message to this user? */ 1373 for (i = 0; i < MAXUNAMES; i++) { 1374 if (!f->f_un.f_uname[i][0]) 1375 break; 1376 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1377 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1378 TTYMSGTIME)) != NULL) { 1379 errno = 0; /* already in msg */ 1380 logerror(p); 1381 } 1382 break; 1383 } 1384 } 1385 } 1386 endutxent(); 1387 reenter = 0; 1388} 1389 1390static void 1391reapchild(int signo __unused) 1392{ 1393 int status; 1394 pid_t pid; 1395 struct filed *f; 1396 1397 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1398 if (!Initialized) 1399 /* Don't tell while we are initting. */ 1400 continue; 1401 1402 /* First, look if it's a process from the dead queue. */ 1403 if (deadq_remove(pid)) 1404 goto oncemore; 1405 1406 /* Now, look in list of active processes. */ 1407 for (f = Files; f; f = f->f_next) 1408 if (f->f_type == F_PIPE && 1409 f->f_un.f_pipe.f_pid == pid) { 1410 (void)close(f->f_file); 1411 f->f_un.f_pipe.f_pid = 0; 1412 log_deadchild(pid, status, 1413 f->f_un.f_pipe.f_pname); 1414 break; 1415 } 1416 oncemore: 1417 continue; 1418 } 1419} 1420 1421/* 1422 * Return a printable representation of a host address. 1423 */ 1424static const char * 1425cvthname(struct sockaddr *f) 1426{ 1427 int error, hl; 1428 sigset_t omask, nmask; 1429 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1430 1431 error = getnameinfo((struct sockaddr *)f, 1432 ((struct sockaddr *)f)->sa_len, 1433 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1434 dprintf("cvthname(%s)\n", ip); 1435 1436 if (error) { 1437 dprintf("Malformed from address %s\n", gai_strerror(error)); 1438 return ("???"); 1439 } 1440 if (!resolve) 1441 return (ip); 1442 1443 sigemptyset(&nmask); 1444 sigaddset(&nmask, SIGHUP); 1445 sigprocmask(SIG_BLOCK, &nmask, &omask); 1446 error = getnameinfo((struct sockaddr *)f, 1447 ((struct sockaddr *)f)->sa_len, 1448 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1449 sigprocmask(SIG_SETMASK, &omask, NULL); 1450 if (error) { 1451 dprintf("Host name for your address (%s) unknown\n", ip); 1452 return (ip); 1453 } 1454 hl = strlen(hname); 1455 if (hl > 0 && hname[hl-1] == '.') 1456 hname[--hl] = '\0'; 1457 trimdomain(hname, hl); 1458 return (hname); 1459} 1460 1461static void 1462dodie(int signo) 1463{ 1464 1465 WantDie = signo; 1466} 1467 1468static void 1469domark(int signo __unused) 1470{ 1471 1472 MarkSet = 1; 1473} 1474 1475/* 1476 * Print syslogd errors some place. 1477 */ 1478static void 1479logerror(const char *type) 1480{ 1481 char buf[512]; 1482 static int recursed = 0; 1483 1484 /* If there's an error while trying to log an error, give up. */ 1485 if (recursed) 1486 return; 1487 recursed++; 1488 if (errno) 1489 (void)snprintf(buf, 1490 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1491 else 1492 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1493 errno = 0; 1494 dprintf("%s\n", buf); 1495 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1496 recursed--; 1497} 1498 1499static void 1500die(int signo) 1501{ 1502 struct filed *f; 1503 struct funix *fx; 1504 int was_initialized; 1505 char buf[100]; 1506 1507 was_initialized = Initialized; 1508 Initialized = 0; /* Don't log SIGCHLDs. */ 1509 for (f = Files; f != NULL; f = f->f_next) { 1510 /* flush any pending output */ 1511 if (f->f_prevcount) 1512 fprintlog(f, 0, (char *)NULL); 1513 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1514 (void)close(f->f_file); 1515 f->f_un.f_pipe.f_pid = 0; 1516 } 1517 } 1518 Initialized = was_initialized; 1519 if (signo) { 1520 dprintf("syslogd: exiting on signal %d\n", signo); 1521 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1522 errno = 0; 1523 logerror(buf); 1524 } 1525 STAILQ_FOREACH(fx, &funixes, next) 1526 (void)unlink(fx->name); 1527 pidfile_remove(pfh); 1528 1529 exit(1); 1530} 1531 1532/* 1533 * INIT -- Initialize syslogd from configuration table 1534 */ 1535static void 1536init(int signo) 1537{ 1538 int i; 1539 FILE *cf; 1540 struct filed *f, *next, **nextp; 1541 char *p; 1542 char cline[LINE_MAX]; 1543 char prog[LINE_MAX]; 1544 char host[MAXHOSTNAMELEN]; 1545 char oldLocalHostName[MAXHOSTNAMELEN]; 1546 char hostMsg[2*MAXHOSTNAMELEN+40]; 1547 char bootfileMsg[LINE_MAX]; 1548 1549 dprintf("init\n"); 1550 1551 /* 1552 * Load hostname (may have changed). 1553 */ 1554 if (signo != 0) 1555 (void)strlcpy(oldLocalHostName, LocalHostName, 1556 sizeof(oldLocalHostName)); 1557 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1558 err(EX_OSERR, "gethostname() failed"); 1559 if ((p = strchr(LocalHostName, '.')) != NULL) { 1560 *p++ = '\0'; 1561 LocalDomain = p; 1562 } else { 1563 LocalDomain = ""; 1564 } 1565 1566 /* 1567 * Close all open log files. 1568 */ 1569 Initialized = 0; 1570 for (f = Files; f != NULL; f = next) { 1571 /* flush any pending output */ 1572 if (f->f_prevcount) 1573 fprintlog(f, 0, (char *)NULL); 1574 1575 switch (f->f_type) { 1576 case F_FILE: 1577 case F_FORW: 1578 case F_CONSOLE: 1579 case F_TTY: 1580 (void)close(f->f_file); 1581 break; 1582 case F_PIPE: 1583 if (f->f_un.f_pipe.f_pid > 0) { 1584 (void)close(f->f_file); 1585 deadq_enter(f->f_un.f_pipe.f_pid, 1586 f->f_un.f_pipe.f_pname); 1587 } 1588 f->f_un.f_pipe.f_pid = 0; 1589 break; 1590 } 1591 next = f->f_next; 1592 if (f->f_program) free(f->f_program); 1593 if (f->f_host) free(f->f_host); 1594 free((char *)f); 1595 } 1596 Files = NULL; 1597 nextp = &Files; 1598 1599 /* open the configuration file */ 1600 if ((cf = fopen(ConfFile, "r")) == NULL) { 1601 dprintf("cannot open %s\n", ConfFile); 1602 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1603 if (*nextp == NULL) { 1604 logerror("calloc"); 1605 exit(1); 1606 } 1607 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1608 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1609 if ((*nextp)->f_next == NULL) { 1610 logerror("calloc"); 1611 exit(1); 1612 } 1613 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1614 Initialized = 1; 1615 return; 1616 } 1617 1618 /* 1619 * Foreach line in the conf table, open that file. 1620 */ 1621 f = NULL; 1622 (void)strlcpy(host, "*", sizeof(host)); 1623 (void)strlcpy(prog, "*", sizeof(prog)); 1624 while (fgets(cline, sizeof(cline), cf) != NULL) { 1625 /* 1626 * check for end-of-section, comments, strip off trailing 1627 * spaces and newline character. #!prog is treated specially: 1628 * following lines apply only to that program. 1629 */ 1630 for (p = cline; isspace(*p); ++p) 1631 continue; 1632 if (*p == 0) 1633 continue; 1634 if (*p == '#') { 1635 p++; 1636 if (*p != '!' && *p != '+' && *p != '-') 1637 continue; 1638 } 1639 if (*p == '+' || *p == '-') { 1640 host[0] = *p++; 1641 while (isspace(*p)) 1642 p++; 1643 if ((!*p) || (*p == '*')) { 1644 (void)strlcpy(host, "*", sizeof(host)); 1645 continue; 1646 } 1647 if (*p == '@') 1648 p = LocalHostName; 1649 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1650 if (!isalnum(*p) && *p != '.' && *p != '-' 1651 && *p != ',' && *p != ':' && *p != '%') 1652 break; 1653 host[i] = *p++; 1654 } 1655 host[i] = '\0'; 1656 continue; 1657 } 1658 if (*p == '!') { 1659 p++; 1660 while (isspace(*p)) p++; 1661 if ((!*p) || (*p == '*')) { 1662 (void)strlcpy(prog, "*", sizeof(prog)); 1663 continue; 1664 } 1665 for (i = 0; i < LINE_MAX - 1; i++) { 1666 if (!isprint(p[i]) || isspace(p[i])) 1667 break; 1668 prog[i] = p[i]; 1669 } 1670 prog[i] = 0; 1671 continue; 1672 } 1673 for (p = cline + 1; *p != '\0'; p++) { 1674 if (*p != '#') 1675 continue; 1676 if (*(p - 1) == '\\') { 1677 strcpy(p - 1, p); 1678 p--; 1679 continue; 1680 } 1681 *p = '\0'; 1682 break; 1683 } 1684 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1685 cline[i] = '\0'; 1686 f = (struct filed *)calloc(1, sizeof(*f)); 1687 if (f == NULL) { 1688 logerror("calloc"); 1689 exit(1); 1690 } 1691 *nextp = f; 1692 nextp = &f->f_next; 1693 cfline(cline, f, prog, host); 1694 } 1695 1696 /* close the configuration file */ 1697 (void)fclose(cf); 1698 1699 Initialized = 1; 1700 1701 if (Debug) { 1702 int port; 1703 for (f = Files; f; f = f->f_next) { 1704 for (i = 0; i <= LOG_NFACILITIES; i++) 1705 if (f->f_pmask[i] == INTERNAL_NOPRI) 1706 printf("X "); 1707 else 1708 printf("%d ", f->f_pmask[i]); 1709 printf("%s: ", TypeNames[f->f_type]); 1710 switch (f->f_type) { 1711 case F_FILE: 1712 printf("%s", f->f_un.f_fname); 1713 break; 1714 1715 case F_CONSOLE: 1716 case F_TTY: 1717 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1718 break; 1719 1720 case F_FORW: 1721 port = (int)ntohs(((struct sockaddr_in *) 1722 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1723 if (port != 514) { 1724 printf("%s:%d", 1725 f->f_un.f_forw.f_hname, port); 1726 } else { 1727 printf("%s", f->f_un.f_forw.f_hname); 1728 } 1729 break; 1730 1731 case F_PIPE: 1732 printf("%s", f->f_un.f_pipe.f_pname); 1733 break; 1734 1735 case F_USERS: 1736 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1737 printf("%s, ", f->f_un.f_uname[i]); 1738 break; 1739 } 1740 if (f->f_program) 1741 printf(" (%s)", f->f_program); 1742 printf("\n"); 1743 } 1744 } 1745 1746 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1747 dprintf("syslogd: restarted\n"); 1748 /* 1749 * Log a change in hostname, but only on a restart. 1750 */ 1751 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1752 (void)snprintf(hostMsg, sizeof(hostMsg), 1753 "syslogd: hostname changed, \"%s\" to \"%s\"", 1754 oldLocalHostName, LocalHostName); 1755 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1756 dprintf("%s\n", hostMsg); 1757 } 1758 /* 1759 * Log the kernel boot file if we aren't going to use it as 1760 * the prefix, and if this is *not* a restart. 1761 */ 1762 if (signo == 0 && !use_bootfile) { 1763 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1764 "syslogd: kernel boot file is %s", bootfile); 1765 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1766 dprintf("%s\n", bootfileMsg); 1767 } 1768} 1769 1770/* 1771 * Crack a configuration file line 1772 */ 1773static void 1774cfline(const char *line, struct filed *f, const char *prog, const char *host) 1775{ 1776 struct addrinfo hints, *res; 1777 int error, i, pri, syncfile; 1778 const char *p, *q; 1779 char *bp; 1780 char buf[MAXLINE], ebuf[100]; 1781 1782 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1783 1784 errno = 0; /* keep strerror() stuff out of logerror messages */ 1785 1786 /* clear out file entry */ 1787 memset(f, 0, sizeof(*f)); 1788 for (i = 0; i <= LOG_NFACILITIES; i++) 1789 f->f_pmask[i] = INTERNAL_NOPRI; 1790 1791 /* save hostname if any */ 1792 if (host && *host == '*') 1793 host = NULL; 1794 if (host) { 1795 int hl; 1796 1797 f->f_host = strdup(host); 1798 if (f->f_host == NULL) { 1799 logerror("strdup"); 1800 exit(1); 1801 } 1802 hl = strlen(f->f_host); 1803 if (hl > 0 && f->f_host[hl-1] == '.') 1804 f->f_host[--hl] = '\0'; 1805 trimdomain(f->f_host, hl); 1806 } 1807 1808 /* save program name if any */ 1809 if (prog && *prog == '*') 1810 prog = NULL; 1811 if (prog) { 1812 f->f_program = strdup(prog); 1813 if (f->f_program == NULL) { 1814 logerror("strdup"); 1815 exit(1); 1816 } 1817 } 1818 1819 /* scan through the list of selectors */ 1820 for (p = line; *p && *p != '\t' && *p != ' ';) { 1821 int pri_done; 1822 int pri_cmp; 1823 int pri_invert; 1824 1825 /* find the end of this facility name list */ 1826 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1827 continue; 1828 1829 /* get the priority comparison */ 1830 pri_cmp = 0; 1831 pri_done = 0; 1832 pri_invert = 0; 1833 if (*q == '!') { 1834 pri_invert = 1; 1835 q++; 1836 } 1837 while (!pri_done) { 1838 switch (*q) { 1839 case '<': 1840 pri_cmp |= PRI_LT; 1841 q++; 1842 break; 1843 case '=': 1844 pri_cmp |= PRI_EQ; 1845 q++; 1846 break; 1847 case '>': 1848 pri_cmp |= PRI_GT; 1849 q++; 1850 break; 1851 default: 1852 pri_done++; 1853 break; 1854 } 1855 } 1856 1857 /* collect priority name */ 1858 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1859 *bp++ = *q++; 1860 *bp = '\0'; 1861 1862 /* skip cruft */ 1863 while (strchr(",;", *q)) 1864 q++; 1865 1866 /* decode priority name */ 1867 if (*buf == '*') { 1868 pri = LOG_PRIMASK; 1869 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1870 } else { 1871 /* Ignore trailing spaces. */ 1872 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1873 buf[i] = '\0'; 1874 1875 pri = decode(buf, prioritynames); 1876 if (pri < 0) { 1877 errno = 0; 1878 (void)snprintf(ebuf, sizeof ebuf, 1879 "unknown priority name \"%s\"", buf); 1880 logerror(ebuf); 1881 return; 1882 } 1883 } 1884 if (!pri_cmp) 1885 pri_cmp = (UniquePriority) 1886 ? (PRI_EQ) 1887 : (PRI_EQ | PRI_GT) 1888 ; 1889 if (pri_invert) 1890 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1891 1892 /* scan facilities */ 1893 while (*p && !strchr("\t.; ", *p)) { 1894 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1895 *bp++ = *p++; 1896 *bp = '\0'; 1897 1898 if (*buf == '*') { 1899 for (i = 0; i < LOG_NFACILITIES; i++) { 1900 f->f_pmask[i] = pri; 1901 f->f_pcmp[i] = pri_cmp; 1902 } 1903 } else { 1904 i = decode(buf, facilitynames); 1905 if (i < 0) { 1906 errno = 0; 1907 (void)snprintf(ebuf, sizeof ebuf, 1908 "unknown facility name \"%s\"", 1909 buf); 1910 logerror(ebuf); 1911 return; 1912 } 1913 f->f_pmask[i >> 3] = pri; 1914 f->f_pcmp[i >> 3] = pri_cmp; 1915 } 1916 while (*p == ',' || *p == ' ') 1917 p++; 1918 } 1919 1920 p = q; 1921 } 1922 1923 /* skip to action part */ 1924 while (*p == '\t' || *p == ' ') 1925 p++; 1926 1927 if (*p == '-') { 1928 syncfile = 0; 1929 p++; 1930 } else 1931 syncfile = 1; 1932 1933 switch (*p) { 1934 case '@': 1935 { 1936 char *tp; 1937 char endkey = ':'; 1938 /* 1939 * scan forward to see if there is a port defined. 1940 * so we can't use strlcpy.. 1941 */ 1942 i = sizeof(f->f_un.f_forw.f_hname); 1943 tp = f->f_un.f_forw.f_hname; 1944 p++; 1945 1946 /* 1947 * an ipv6 address should start with a '[' in that case 1948 * we should scan for a ']' 1949 */ 1950 if (*p == '[') { 1951 p++; 1952 endkey = ']'; 1953 } 1954 while (*p && (*p != endkey) && (i-- > 0)) { 1955 *tp++ = *p++; 1956 } 1957 if (endkey == ']' && *p == endkey) 1958 p++; 1959 *tp = '\0'; 1960 } 1961 /* See if we copied a domain and have a port */ 1962 if (*p == ':') 1963 p++; 1964 else 1965 p = NULL; 1966 1967 memset(&hints, 0, sizeof(hints)); 1968 hints.ai_family = family; 1969 hints.ai_socktype = SOCK_DGRAM; 1970 error = getaddrinfo(f->f_un.f_forw.f_hname, 1971 p ? p : "syslog", &hints, &res); 1972 if (error) { 1973 logerror(gai_strerror(error)); 1974 break; 1975 } 1976 f->f_un.f_forw.f_addr = res; 1977 f->f_type = F_FORW; 1978 break; 1979 1980 case '/': 1981 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1982 f->f_type = F_UNUSED; 1983 logerror(p); 1984 break; 1985 } 1986 if (syncfile) 1987 f->f_flags |= FFLAG_SYNC; 1988 if (isatty(f->f_file)) { 1989 if (strcmp(p, ctty) == 0) 1990 f->f_type = F_CONSOLE; 1991 else 1992 f->f_type = F_TTY; 1993 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1994 sizeof(f->f_un.f_fname)); 1995 } else { 1996 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1997 f->f_type = F_FILE; 1998 } 1999 break; 2000 2001 case '|': 2002 f->f_un.f_pipe.f_pid = 0; 2003 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2004 sizeof(f->f_un.f_pipe.f_pname)); 2005 f->f_type = F_PIPE; 2006 break; 2007 2008 case '*': 2009 f->f_type = F_WALL; 2010 break; 2011 2012 default: 2013 for (i = 0; i < MAXUNAMES && *p; i++) { 2014 for (q = p; *q && *q != ','; ) 2015 q++; 2016 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2017 if ((q - p) >= MAXLOGNAME) 2018 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2019 else 2020 f->f_un.f_uname[i][q - p] = '\0'; 2021 while (*q == ',' || *q == ' ') 2022 q++; 2023 p = q; 2024 } 2025 f->f_type = F_USERS; 2026 break; 2027 } 2028} 2029 2030 2031/* 2032 * Decode a symbolic name to a numeric value 2033 */ 2034static int 2035decode(const char *name, const CODE *codetab) 2036{ 2037 const CODE *c; 2038 char *p, buf[40]; 2039 2040 if (isdigit(*name)) 2041 return (atoi(name)); 2042 2043 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2044 if (isupper(*name)) 2045 *p = tolower(*name); 2046 else 2047 *p = *name; 2048 } 2049 *p = '\0'; 2050 for (c = codetab; c->c_name; c++) 2051 if (!strcmp(buf, c->c_name)) 2052 return (c->c_val); 2053 2054 return (-1); 2055} 2056 2057static void 2058markit(void) 2059{ 2060 struct filed *f; 2061 dq_t q, next; 2062 2063 now = time((time_t *)NULL); 2064 MarkSeq += TIMERINTVL; 2065 if (MarkSeq >= MarkInterval) { 2066 logmsg(LOG_INFO, "-- MARK --", 2067 LocalHostName, ADDDATE|MARK); 2068 MarkSeq = 0; 2069 } 2070 2071 for (f = Files; f; f = f->f_next) { 2072 if (f->f_prevcount && now >= REPEATTIME(f)) { 2073 dprintf("flush %s: repeated %d times, %d sec.\n", 2074 TypeNames[f->f_type], f->f_prevcount, 2075 repeatinterval[f->f_repeatcount]); 2076 fprintlog(f, 0, (char *)NULL); 2077 BACKOFF(f); 2078 } 2079 } 2080 2081 /* Walk the dead queue, and see if we should signal somebody. */ 2082 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2083 next = TAILQ_NEXT(q, dq_entries); 2084 2085 switch (q->dq_timeout) { 2086 case 0: 2087 /* Already signalled once, try harder now. */ 2088 if (kill(q->dq_pid, SIGKILL) != 0) 2089 (void)deadq_remove(q->dq_pid); 2090 break; 2091 2092 case 1: 2093 /* 2094 * Timed out on dead queue, send terminate 2095 * signal. Note that we leave the removal 2096 * from the dead queue to reapchild(), which 2097 * will also log the event (unless the process 2098 * didn't even really exist, in case we simply 2099 * drop it from the dead queue). 2100 */ 2101 if (kill(q->dq_pid, SIGTERM) != 0) 2102 (void)deadq_remove(q->dq_pid); 2103 /* FALLTHROUGH */ 2104 2105 default: 2106 q->dq_timeout--; 2107 } 2108 } 2109 MarkSet = 0; 2110 (void)alarm(TIMERINTVL); 2111} 2112 2113/* 2114 * fork off and become a daemon, but wait for the child to come online 2115 * before returing to the parent, or we get disk thrashing at boot etc. 2116 * Set a timer so we don't hang forever if it wedges. 2117 */ 2118static int 2119waitdaemon(int nochdir, int noclose, int maxwait) 2120{ 2121 int fd; 2122 int status; 2123 pid_t pid, childpid; 2124 2125 switch (childpid = fork()) { 2126 case -1: 2127 return (-1); 2128 case 0: 2129 break; 2130 default: 2131 signal(SIGALRM, timedout); 2132 alarm(maxwait); 2133 while ((pid = wait3(&status, 0, NULL)) != -1) { 2134 if (WIFEXITED(status)) 2135 errx(1, "child pid %d exited with return code %d", 2136 pid, WEXITSTATUS(status)); 2137 if (WIFSIGNALED(status)) 2138 errx(1, "child pid %d exited on signal %d%s", 2139 pid, WTERMSIG(status), 2140 WCOREDUMP(status) ? " (core dumped)" : 2141 ""); 2142 if (pid == childpid) /* it's gone... */ 2143 break; 2144 } 2145 exit(0); 2146 } 2147 2148 if (setsid() == -1) 2149 return (-1); 2150 2151 if (!nochdir) 2152 (void)chdir("/"); 2153 2154 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2155 (void)dup2(fd, STDIN_FILENO); 2156 (void)dup2(fd, STDOUT_FILENO); 2157 (void)dup2(fd, STDERR_FILENO); 2158 if (fd > 2) 2159 (void)close (fd); 2160 } 2161 return (getppid()); 2162} 2163 2164/* 2165 * We get a SIGALRM from the child when it's running and finished doing it's 2166 * fsync()'s or O_SYNC writes for all the boot messages. 2167 * 2168 * We also get a signal from the kernel if the timer expires, so check to 2169 * see what happened. 2170 */ 2171static void 2172timedout(int sig __unused) 2173{ 2174 int left; 2175 left = alarm(0); 2176 signal(SIGALRM, SIG_DFL); 2177 if (left == 0) 2178 errx(1, "timed out waiting for child"); 2179 else 2180 _exit(0); 2181} 2182 2183/* 2184 * Add `s' to the list of allowable peer addresses to accept messages 2185 * from. 2186 * 2187 * `s' is a string in the form: 2188 * 2189 * [*]domainname[:{servicename|portnumber|*}] 2190 * 2191 * or 2192 * 2193 * netaddr/maskbits[:{servicename|portnumber|*}] 2194 * 2195 * Returns -1 on error, 0 if the argument was valid. 2196 */ 2197static int 2198allowaddr(char *s) 2199{ 2200 char *cp1, *cp2; 2201 struct allowedpeer ap; 2202 struct servent *se; 2203 int masklen = -1; 2204 struct addrinfo hints, *res; 2205 struct in_addr *addrp, *maskp; 2206#ifdef INET6 2207 int i; 2208 u_int32_t *addr6p, *mask6p; 2209#endif 2210 char ip[NI_MAXHOST]; 2211 2212#ifdef INET6 2213 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2214#endif 2215 cp1 = s; 2216 if ((cp1 = strrchr(cp1, ':'))) { 2217 /* service/port provided */ 2218 *cp1++ = '\0'; 2219 if (strlen(cp1) == 1 && *cp1 == '*') 2220 /* any port allowed */ 2221 ap.port = 0; 2222 else if ((se = getservbyname(cp1, "udp"))) { 2223 ap.port = ntohs(se->s_port); 2224 } else { 2225 ap.port = strtol(cp1, &cp2, 0); 2226 if (*cp2 != '\0') 2227 return (-1); /* port not numeric */ 2228 } 2229 } else { 2230 if ((se = getservbyname("syslog", "udp"))) 2231 ap.port = ntohs(se->s_port); 2232 else 2233 /* sanity, should not happen */ 2234 ap.port = 514; 2235 } 2236 2237 if ((cp1 = strchr(s, '/')) != NULL && 2238 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2239 *cp1 = '\0'; 2240 if ((masklen = atoi(cp1 + 1)) < 0) 2241 return (-1); 2242 } 2243#ifdef INET6 2244 if (*s == '[') { 2245 cp2 = s + strlen(s) - 1; 2246 if (*cp2 == ']') { 2247 ++s; 2248 *cp2 = '\0'; 2249 } else { 2250 cp2 = NULL; 2251 } 2252 } else { 2253 cp2 = NULL; 2254 } 2255#endif 2256 memset(&hints, 0, sizeof(hints)); 2257 hints.ai_family = PF_UNSPEC; 2258 hints.ai_socktype = SOCK_DGRAM; 2259 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2260 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2261 ap.isnumeric = 1; 2262 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2263 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2264 ap.a_mask.ss_family = res->ai_family; 2265 if (res->ai_family == AF_INET) { 2266 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2267 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2268 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2269 if (masklen < 0) { 2270 /* use default netmask */ 2271 if (IN_CLASSA(ntohl(addrp->s_addr))) 2272 maskp->s_addr = htonl(IN_CLASSA_NET); 2273 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2274 maskp->s_addr = htonl(IN_CLASSB_NET); 2275 else 2276 maskp->s_addr = htonl(IN_CLASSC_NET); 2277 } else if (masklen <= 32) { 2278 /* convert masklen to netmask */ 2279 if (masklen == 0) 2280 maskp->s_addr = 0; 2281 else 2282 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2283 } else { 2284 freeaddrinfo(res); 2285 return (-1); 2286 } 2287 /* Lose any host bits in the network number. */ 2288 addrp->s_addr &= maskp->s_addr; 2289 } 2290#ifdef INET6 2291 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2292 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2293 if (masklen < 0) 2294 masklen = 128; 2295 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2296 /* convert masklen to netmask */ 2297 while (masklen > 0) { 2298 if (masklen < 32) { 2299 *mask6p = htonl(~(0xffffffff >> masklen)); 2300 break; 2301 } 2302 *mask6p++ = 0xffffffff; 2303 masklen -= 32; 2304 } 2305 /* Lose any host bits in the network number. */ 2306 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2307 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2308 for (i = 0; i < 4; i++) 2309 addr6p[i] &= mask6p[i]; 2310 } 2311#endif 2312 else { 2313 freeaddrinfo(res); 2314 return (-1); 2315 } 2316 freeaddrinfo(res); 2317 } else { 2318 /* arg `s' is domain name */ 2319 ap.isnumeric = 0; 2320 ap.a_name = s; 2321 if (cp1) 2322 *cp1 = '/'; 2323#ifdef INET6 2324 if (cp2) { 2325 *cp2 = ']'; 2326 --s; 2327 } 2328#endif 2329 } 2330 2331 if (Debug) { 2332 printf("allowaddr: rule %d: ", NumAllowed); 2333 if (ap.isnumeric) { 2334 printf("numeric, "); 2335 getnameinfo((struct sockaddr *)&ap.a_addr, 2336 ((struct sockaddr *)&ap.a_addr)->sa_len, 2337 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2338 printf("addr = %s, ", ip); 2339 getnameinfo((struct sockaddr *)&ap.a_mask, 2340 ((struct sockaddr *)&ap.a_mask)->sa_len, 2341 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2342 printf("mask = %s; ", ip); 2343 } else { 2344 printf("domainname = %s; ", ap.a_name); 2345 } 2346 printf("port = %d\n", ap.port); 2347 } 2348 2349 if ((AllowedPeers = realloc(AllowedPeers, 2350 ++NumAllowed * sizeof(struct allowedpeer))) 2351 == NULL) { 2352 logerror("realloc"); 2353 exit(1); 2354 } 2355 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2356 return (0); 2357} 2358 2359/* 2360 * Validate that the remote peer has permission to log to us. 2361 */ 2362static int 2363validate(struct sockaddr *sa, const char *hname) 2364{ 2365 int i; 2366 size_t l1, l2; 2367 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2368 struct allowedpeer *ap; 2369 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2370#ifdef INET6 2371 int j, reject; 2372 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2373#endif 2374 struct addrinfo hints, *res; 2375 u_short sport; 2376 2377 if (NumAllowed == 0) 2378 /* traditional behaviour, allow everything */ 2379 return (1); 2380 2381 (void)strlcpy(name, hname, sizeof(name)); 2382 memset(&hints, 0, sizeof(hints)); 2383 hints.ai_family = PF_UNSPEC; 2384 hints.ai_socktype = SOCK_DGRAM; 2385 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2386 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2387 freeaddrinfo(res); 2388 else if (strchr(name, '.') == NULL) { 2389 strlcat(name, ".", sizeof name); 2390 strlcat(name, LocalDomain, sizeof name); 2391 } 2392 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2393 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2394 return (0); /* for safety, should not occur */ 2395 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2396 ip, port, name); 2397 sport = atoi(port); 2398 2399 /* now, walk down the list */ 2400 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2401 if (ap->port != 0 && ap->port != sport) { 2402 dprintf("rejected in rule %d due to port mismatch.\n", i); 2403 continue; 2404 } 2405 2406 if (ap->isnumeric) { 2407 if (ap->a_addr.ss_family != sa->sa_family) { 2408 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2409 continue; 2410 } 2411 if (ap->a_addr.ss_family == AF_INET) { 2412 sin4 = (struct sockaddr_in *)sa; 2413 a4p = (struct sockaddr_in *)&ap->a_addr; 2414 m4p = (struct sockaddr_in *)&ap->a_mask; 2415 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2416 != a4p->sin_addr.s_addr) { 2417 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2418 continue; 2419 } 2420 } 2421#ifdef INET6 2422 else if (ap->a_addr.ss_family == AF_INET6) { 2423 sin6 = (struct sockaddr_in6 *)sa; 2424 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2425 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2426 if (a6p->sin6_scope_id != 0 && 2427 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2428 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2429 continue; 2430 } 2431 reject = 0; 2432 for (j = 0; j < 16; j += 4) { 2433 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2434 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2435 ++reject; 2436 break; 2437 } 2438 } 2439 if (reject) { 2440 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2441 continue; 2442 } 2443 } 2444#endif 2445 else 2446 continue; 2447 } else { 2448 cp = ap->a_name; 2449 l1 = strlen(name); 2450 if (*cp == '*') { 2451 /* allow wildmatch */ 2452 cp++; 2453 l2 = strlen(cp); 2454 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2455 dprintf("rejected in rule %d due to name mismatch.\n", i); 2456 continue; 2457 } 2458 } else { 2459 /* exact match */ 2460 l2 = strlen(cp); 2461 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2462 dprintf("rejected in rule %d due to name mismatch.\n", i); 2463 continue; 2464 } 2465 } 2466 } 2467 dprintf("accepted in rule %d.\n", i); 2468 return (1); /* hooray! */ 2469 } 2470 return (0); 2471} 2472 2473/* 2474 * Fairly similar to popen(3), but returns an open descriptor, as 2475 * opposed to a FILE *. 2476 */ 2477static int 2478p_open(const char *prog, pid_t *rpid) 2479{ 2480 int pfd[2], nulldesc; 2481 pid_t pid; 2482 sigset_t omask, mask; 2483 char *argv[4]; /* sh -c cmd NULL */ 2484 char errmsg[200]; 2485 2486 if (pipe(pfd) == -1) 2487 return (-1); 2488 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2489 /* we are royally screwed anyway */ 2490 return (-1); 2491 2492 sigemptyset(&mask); 2493 sigaddset(&mask, SIGALRM); 2494 sigaddset(&mask, SIGHUP); 2495 sigprocmask(SIG_BLOCK, &mask, &omask); 2496 switch ((pid = fork())) { 2497 case -1: 2498 sigprocmask(SIG_SETMASK, &omask, 0); 2499 close(nulldesc); 2500 return (-1); 2501 2502 case 0: 2503 argv[0] = strdup("sh"); 2504 argv[1] = strdup("-c"); 2505 argv[2] = strdup(prog); 2506 argv[3] = NULL; 2507 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2508 logerror("strdup"); 2509 exit(1); 2510 } 2511 2512 alarm(0); 2513 (void)setsid(); /* Avoid catching SIGHUPs. */ 2514 2515 /* 2516 * Throw away pending signals, and reset signal 2517 * behaviour to standard values. 2518 */ 2519 signal(SIGALRM, SIG_IGN); 2520 signal(SIGHUP, SIG_IGN); 2521 sigprocmask(SIG_SETMASK, &omask, 0); 2522 signal(SIGPIPE, SIG_DFL); 2523 signal(SIGQUIT, SIG_DFL); 2524 signal(SIGALRM, SIG_DFL); 2525 signal(SIGHUP, SIG_DFL); 2526 2527 dup2(pfd[0], STDIN_FILENO); 2528 dup2(nulldesc, STDOUT_FILENO); 2529 dup2(nulldesc, STDERR_FILENO); 2530 closefrom(3); 2531 2532 (void)execvp(_PATH_BSHELL, argv); 2533 _exit(255); 2534 } 2535 2536 sigprocmask(SIG_SETMASK, &omask, 0); 2537 close(nulldesc); 2538 close(pfd[0]); 2539 /* 2540 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2541 * supposed to get an EWOULDBLOCK on writev(2), which is 2542 * caught by the logic above anyway, which will in turn close 2543 * the pipe, and fork a new logging subprocess if necessary. 2544 * The stale subprocess will be killed some time later unless 2545 * it terminated itself due to closing its input pipe (so we 2546 * get rid of really dead puppies). 2547 */ 2548 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2549 /* This is bad. */ 2550 (void)snprintf(errmsg, sizeof errmsg, 2551 "Warning: cannot change pipe to PID %d to " 2552 "non-blocking behaviour.", 2553 (int)pid); 2554 logerror(errmsg); 2555 } 2556 *rpid = pid; 2557 return (pfd[1]); 2558} 2559 2560static void 2561deadq_enter(pid_t pid, const char *name) 2562{ 2563 dq_t p; 2564 int status; 2565 2566 /* 2567 * Be paranoid, if we can't signal the process, don't enter it 2568 * into the dead queue (perhaps it's already dead). If possible, 2569 * we try to fetch and log the child's status. 2570 */ 2571 if (kill(pid, 0) != 0) { 2572 if (waitpid(pid, &status, WNOHANG) > 0) 2573 log_deadchild(pid, status, name); 2574 return; 2575 } 2576 2577 p = malloc(sizeof(struct deadq_entry)); 2578 if (p == NULL) { 2579 logerror("malloc"); 2580 exit(1); 2581 } 2582 2583 p->dq_pid = pid; 2584 p->dq_timeout = DQ_TIMO_INIT; 2585 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2586} 2587 2588static int 2589deadq_remove(pid_t pid) 2590{ 2591 dq_t q; 2592 2593 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2594 if (q->dq_pid == pid) { 2595 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2596 free(q); 2597 return (1); 2598 } 2599 } 2600 2601 return (0); 2602} 2603 2604static void 2605log_deadchild(pid_t pid, int status, const char *name) 2606{ 2607 int code; 2608 char buf[256]; 2609 const char *reason; 2610 2611 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2612 if (WIFSIGNALED(status)) { 2613 reason = "due to signal"; 2614 code = WTERMSIG(status); 2615 } else { 2616 reason = "with status"; 2617 code = WEXITSTATUS(status); 2618 if (code == 0) 2619 return; 2620 } 2621 (void)snprintf(buf, sizeof buf, 2622 "Logging subprocess %d (%s) exited %s %d.", 2623 pid, name, reason, code); 2624 logerror(buf); 2625} 2626 2627static int * 2628socksetup(int af, char *bindhostname) 2629{ 2630 struct addrinfo hints, *res, *r; 2631 const char *bindservice; 2632 char *cp; 2633 int error, maxs, *s, *socks; 2634 2635 /* 2636 * We have to handle this case for backwards compatibility: 2637 * If there are two (or more) colons but no '[' and ']', 2638 * assume this is an inet6 address without a service. 2639 */ 2640 bindservice = "syslog"; 2641 if (bindhostname != NULL) { 2642#ifdef INET6 2643 if (*bindhostname == '[' && 2644 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2645 ++bindhostname; 2646 *cp = '\0'; 2647 if (cp[1] == ':' && cp[2] != '\0') 2648 bindservice = cp + 2; 2649 } else { 2650#endif 2651 cp = strchr(bindhostname, ':'); 2652 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2653 *cp = '\0'; 2654 if (cp[1] != '\0') 2655 bindservice = cp + 1; 2656 if (cp == bindhostname) 2657 bindhostname = NULL; 2658 } 2659#ifdef INET6 2660 } 2661#endif 2662 } 2663 2664 memset(&hints, 0, sizeof(hints)); 2665 hints.ai_flags = AI_PASSIVE; 2666 hints.ai_family = af; 2667 hints.ai_socktype = SOCK_DGRAM; 2668 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2669 if (error) { 2670 logerror(gai_strerror(error)); 2671 errno = 0; 2672 die(0); 2673 } 2674 2675 /* Count max number of sockets we may open */ 2676 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2677 socks = malloc((maxs+1) * sizeof(int)); 2678 if (socks == NULL) { 2679 logerror("couldn't allocate memory for sockets"); 2680 die(0); 2681 } 2682 2683 *socks = 0; /* num of sockets counter at start of array */ 2684 s = socks + 1; 2685 for (r = res; r; r = r->ai_next) { 2686 int on = 1; 2687 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2688 if (*s < 0) { 2689 logerror("socket"); 2690 continue; 2691 } 2692#ifdef INET6 2693 if (r->ai_family == AF_INET6) { 2694 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2695 (char *)&on, sizeof (on)) < 0) { 2696 logerror("setsockopt"); 2697 close(*s); 2698 continue; 2699 } 2700 } 2701#endif 2702 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2703 (char *)&on, sizeof (on)) < 0) { 2704 logerror("setsockopt"); 2705 close(*s); 2706 continue; 2707 } 2708 /* 2709 * RFC 3164 recommends that client side message 2710 * should come from the privileged syslogd port. 2711 * 2712 * If the system administrator choose not to obey 2713 * this, we can skip the bind() step so that the 2714 * system will choose a port for us. 2715 */ 2716 if (!NoBind) { 2717 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2718 logerror("bind"); 2719 close(*s); 2720 continue; 2721 } 2722 2723 if (!SecureMode) 2724 increase_rcvbuf(*s); 2725 } 2726 2727 (*socks)++; 2728 s++; 2729 } 2730 2731 if (*socks == 0) { 2732 free(socks); 2733 if (Debug) 2734 return (NULL); 2735 else 2736 die(0); 2737 } 2738 if (res) 2739 freeaddrinfo(res); 2740 2741 return (socks); 2742} 2743 2744static void 2745increase_rcvbuf(int fd) 2746{ 2747 socklen_t len, slen; 2748 2749 slen = sizeof(len); 2750 2751 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2752 if (len < RCVBUF_MINSIZE) { 2753 len = RCVBUF_MINSIZE; 2754 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2755 } 2756 } 2757} 2758