SystemConfiguration.fproj/moh.c

   1 /*
   2  * Copyright (c) 2002, 2003, 2005, 2013-2015 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 /*
  25  * Modification History
  26  *
  27  * May 29, 2002         Roger Smith <rsmith@apple.com>
  28  * - initial revision
  29  */
  30
  31 #include <stdio.h>
  32 #include <unistd.h>
  33 #include <sys/types.h>
  34 #include <sys/errno.h>
  35 #include <sys/socket.h>
  36 #include <sys/un.h>
  37
  38 #include <SystemConfiguration/SystemConfiguration.h>
  39 #include <SystemConfiguration/SCPrivate.h>
  40
  41 #include "moh.h"
  42 #include "moh_msg.h"
  43
  44 // Note: right now we are not currently using the deviceName.  This could be the raw
  45 //       tty name such as "modem" since this is guaranteed to be unique in the /dev.
  46 //       We would use this deviceName to differientate between multiple MOH devices
  47 //       present in the system when we create the socket.
  48
  49
  50 static ssize_t
  51 readn(int ref, void *data, size_t len)
  52 {
  53         size_t  left    = len;
  54         ssize_t n;
  55         void    *p      = data;
  56
  57         while (left > 0) {
  58                 if ((n = read(ref, p, left)) == -1) {
  59                         if (errno != EINTR) {
  60                                 return -1;
  61                         }
  62                         n = 0;
  63                 } else if (n == 0) {
  64                         break; /* EOF */
  65                 }
  66
  67                 left -= n;
  68                 p += n;
  69         }
  70         return (len - left);
  71 }
  72
  73
  74 static ssize_t
  75 writen(int ref, const void *data, size_t len)
  76 {
  77         size_t          left    = len;
  78         ssize_t         n;
  79         const void      *p      = data;
  80
  81         while (left > 0) {
  82                 if ((n = write(ref, p, left)) == -1) {
  83                         if (errno != EINTR) {
  84                                 return -1;
  85                         }
  86                         n = 0;
  87                 }
  88                 left -= n;
  89                 p += n;
  90         }
  91         return len;
  92 }
  93
  94
  95 __private_extern__
  96 int
  97 MOHInit(int *ref, CFStringRef deviceName)
  98 {
  99         int                     sock;
 100         int                     status;
 101         struct sockaddr_un      sun;
 102
 103         sock = socket(AF_LOCAL, SOCK_STREAM, 0);
 104
 105         bzero(&sun, sizeof(sun));
 106         sun.sun_family = AF_LOCAL;
 107         strncpy(sun.sun_path, MOH_PATH, sizeof(sun.sun_path));
 108
 109         status = connect(sock, (struct sockaddr *)&sun, sizeof(sun));
 110         if (status == -1) {
 111                 return errno;
 112         }
 113
 114         *ref = sock;
 115         return 0;
 116 }
 117
 118
 119 __private_extern__
 120 int
 121 MOHDispose(int ref)
 122 {
 123         if (close(ref) == -1) {
 124                 return errno;
 125         }
 126         return 0;
 127 }
 128
 129
 130 __private_extern__
 131 int
 132 MOHExec(int             ref,
 133         uint32_t        link,
 134         uint32_t        cmd,
 135         void            *request,
 136         size_t          requestLen,
 137         void            **reply,
 138         size_t          *replyLen)
 139 {
 140         struct moh_msg_hdr      msg;
 141         char                    *buf            = NULL;
 142         ssize_t                 n;
 143
 144         bzero(&msg, sizeof(msg));
 145         msg.m_type = cmd;
 146         msg.m_link = link;
 147         msg.m_len  = ((request != NULL) && (requestLen > 0)) ? (uint32_t)requestLen : 0;
 148
 149         //  send the command
 150         n = writen(ref, &msg, sizeof(msg));
 151         if (n == -1) {
 152                 SC_log(LOG_INFO, "writen() failed: %s", strerror(errno));
 153                 return errno;
 154         } else if (n != sizeof(msg)) {
 155                 SC_log(LOG_INFO, "writen() failed: wrote=%ld", n);
 156                 return -1;
 157         }
 158
 159         if ((request != NULL) && (requestLen > 0)) {
 160                 n = writen(ref, request, requestLen);
 161                 if (n == -1) {
 162                         SC_log(LOG_INFO, "writen() failed: %s", strerror(errno));
 163                         return errno;
 164                 } else if (n != (ssize_t)requestLen) {
 165                         SC_log(LOG_INFO, "writen() failed: wrote=%ld", n);
 166                         return -1;
 167                 }
 168         }
 169
 170         // always expect a reply
 171         n = readn(ref, &msg, sizeof(msg));
 172         if (n == -1) {
 173                 SC_log(LOG_INFO, "readn() failed: error=%s", strerror(errno));
 174                 return errno;
 175         } else if (n != sizeof(msg)) {
 176                 SC_log(LOG_INFO, "readn() failed: insufficent data, read=%ld", n);
 177                 return -1;
 178         }
 179
 180         if (msg.m_len) {
 181                 buf = CFAllocatorAllocate(NULL, msg.m_len, 0);
 182                 if (buf) {
 183                         // read reply
 184                         n = readn(ref, buf, msg.m_len);
 185                         if (n == -1) {
 186                                 SC_log(LOG_INFO, "readn() failed: error=%s", strerror(errno));
 187                                 CFAllocatorDeallocate(NULL, buf);
 188                                 return errno;
 189                         } else if (n != (ssize_t)msg.m_len) {
 190                                 SC_log(LOG_INFO, "readn() failed: insufficent data, read=%ld", n);
 191                                 CFAllocatorDeallocate(NULL, buf);
 192                                 return -1;
 193                         }
 194                 }
 195         }
 196
 197         if (reply && replyLen) {
 198                 *reply    = buf;
 199                 *replyLen = msg.m_len;
 200         } else if (buf) {
 201                 // if additional returned data is unwanted
 202                 CFAllocatorDeallocate(NULL, buf);
 203         }
 204
 205         return msg.m_result;
 206 }
 207