syslogd.tproj/klog_in.c

   1 /*
   2  * Copyright (c) 2004-2008 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <sys/socket.h>
  27 #include <sys/un.h>
  28 #include <sys/uio.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <fcntl.h>
  33 #include <errno.h>
  34 #include <unistd.h>
  35 #include "daemon.h"
  36
  37 #define forever for(;;)
  38
  39 #define MY_ID "klog_in"
  40 #define MAXLINE 4096
  41
  42 static int kx = 0;
  43 static char kline[MAXLINE + 1];
  44
  45 asl_msg_t *
  46 klog_in_acceptmsg(int fd)
  47 {
  48         int n;
  49         char c;
  50
  51         n = read(fd, &c, 1);
  52
  53         while ((n == 1) && (c != '\n'))
  54         {
  55                 if (kx < MAXLINE) kline[kx++] = c;
  56                 n = read(fd, &c, 1);
  57         }
  58
  59         if (kx == 0) return NULL;
  60
  61         n = kx - 1;
  62         kline[kx] = '\0';
  63         kx = 0;
  64
  65         return asl_input_parse(kline, n, NULL, 1);
  66 }
  67
  68 int
  69 klog_in_init(void)
  70 {
  71         asldebug("%s: init\n", MY_ID);
  72         if (global.kfd >= 0) return global.kfd;
  73
  74         global.kfd = open(_PATH_KLOG, O_RDONLY, 0);
  75         if (global.kfd < 0)
  76         {
  77                 asldebug("%s: couldn't open %s: %s\n", MY_ID, _PATH_KLOG, strerror(errno));
  78                 return -1;
  79         }
  80
  81         if (fcntl(global.kfd, F_SETFL, O_NONBLOCK) < 0)
  82         {
  83                 close(global.kfd);
  84                 global.kfd = -1;
  85                 asldebug("%s: couldn't set O_NONBLOCK for fd %d (%s): %s\n", MY_ID, global.kfd, _PATH_KLOG, strerror(errno));
  86                 return -1;
  87         }
  88
  89         return aslevent_addfd(global.kfd, ADDFD_FLAGS_LOCAL, klog_in_acceptmsg, NULL, NULL);
  90 }
  91
  92 int
  93 klog_in_reset(void)
  94 {
  95         return 0;
  96 }
  97
  98 int
  99 klog_in_close(void)
 100 {
 101         if (global.kfd < 0) return 1;
 102
 103         close(global.kfd);
 104         global.kfd = -1;
 105
 106         return 0;
 107 }