syslogd.tproj/bsd_in.c

   1 /*
   2  * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 2004 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <sys/socket.h>
  28 #include <sys/fcntl.h>
  29 #include <sys/un.h>
  30 #include <sys/uio.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <errno.h>
  36 #include "daemon.h"
  37
  38 #define MY_ID "bsd_in"
  39 #define MAXLINE 1024
  40
  41 static int sock = -1;
  42
  43 asl_msg_t *
  44 bsd_in_acceptmsg(int fd)
  45 {
  46         uint32_t len;
  47         int n;
  48         char line[MAXLINE + 1];
  49         struct sockaddr_un sun;
  50
  51         len = sizeof(struct sockaddr_un);
  52         n = recvfrom(fd, line, MAXLINE, 0, (struct sockaddr *)&sun, &len);
  53
  54         if (n <= 0) return NULL;
  55
  56         line[n] = '\0';
  57         return asl_syslog_input_convert(line, n, NULL, 0);
  58 }
  59
  60 int
  61 bsd_in_init(void)
  62 {
  63         struct sockaddr_un sun;
  64         int rbufsize;
  65         int len;
  66
  67         asldebug("%s: init\n", MY_ID);
  68         if (sock >= 0) return sock;
  69
  70         unlink(_PATH_SYSLOG_IN);
  71         sock = socket(AF_UNIX, SOCK_DGRAM, 0);
  72         if (sock < 0)
  73         {
  74                 asldebug("%s: couldn't create socket for %s: %s\n", MY_ID, _PATH_SYSLOG_IN, strerror(errno));
  75                 return -1;
  76         }
  77
  78         asldebug("%s: creating %s for fd %d\n", MY_ID, _PATH_SYSLOG_IN, sock);
  79
  80         memset(&sun, 0, sizeof(sun));
  81         sun.sun_family = AF_UNIX;
  82         strcpy(sun.sun_path, _PATH_SYSLOG_IN);
  83
  84         len = sizeof(struct sockaddr_un);
  85         if (bind(sock, (struct sockaddr *)&sun, len) < 0)
  86         {
  87                 asldebug("%s: couldn't bind socket %d for %s: %s\n", MY_ID, sock, _PATH_SYSLOG_IN, strerror(errno));
  88                 close(sock);
  89                 sock = -1;
  90                 return -1;
  91         }
  92
  93         rbufsize = 128 * 1024;
  94         len = sizeof(rbufsize);
  95
  96         if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &rbufsize, len) < 0)
  97         {
  98                 asldebug("%s: couldn't set receive buffer size for socket %d (%s): %s\n", MY_ID, sock, _PATH_SYSLOG_IN, strerror(errno));
  99                 close(sock);
 100                 sock = -1;
 101                 return -1;
 102         }
 103
 104         if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
 105         {
 106                 asldebug("%s: couldn't set O_NONBLOCK for socket %d (%s): %s\n", MY_ID, sock, _PATH_SYSLOG_IN, strerror(errno));
 107                 close(sock);
 108                 sock = -1;
 109                 return -1;
 110         }
 111
 112         chmod(_PATH_SYSLOG_IN, 0666);
 113
 114         return aslevent_addfd(sock, bsd_in_acceptmsg, NULL, NULL);
 115 }
 116
 117 int
 118 bsd_in_reset(void)
 119 {
 120         return 0;
 121 }
 122
 123 int
 124 bsd_in_close(void)
 125 {
 126         if (sock < 0) return 1;
 127
 128         close(sock);
 129         unlink(_PATH_SYSLOG_IN);
 130         return 0;
 131 }