[Asterisk-Dev] PPP over ISDN

[Lattanzio Francesco]

Hi,
    I'm using PPPD to make remote assistance through ISDN, for
people that can't (or won't) give Internet access to the PBX (i.e.,
Asterisk).
This is the overall configuration:

  1) Linux 2.6.10
  2) mISDN_for_PBX4Linux_2005_03_06.tar.gz and
     mISDNuser_for_PBX4Linux_2005_01_28.tar.gz from isdn.jolly.de
  3) chan_misdn-beta-0.1.0.tgz + BN4S0/BN8S0 from beroNet
  4) Asterisk 1.0.6
  5) app_pppd-050202.tgz from www.sirrix.de

To make things work, the following patches are needed:

for mISDN_for_PBX4Linux_2005_03_06.tar.gz:

diff -urN mISDN/drivers/isdn/hardware/mISDN/hfc_multi.c mISDN-fixed/drivers/isdn/hardware/mISDN/hfc_multi.c
--- mISDN/drivers/isdn/hardware/mISDN/hfc_multi.c	2005-01-31 18:24:03.000000000 +0100
+++ mISDN-fixed/drivers/isdn/hardware/mISDN/hfc_multi.c	2005-04-22 08:40:16.000000000 +0200
@@ -2799,7 +2799,7 @@
 		if (debug & DEBUG_HFCMULTI_INIT)
 			printk(KERN_DEBUG "setup_pci(): investigating card entry %d (looking for type %d)\n", i, hc->type);
 		inuse:
-		tmp_dev = pci_find_subsys(id_list[i].vendor_id, id_list[i].device_id, id_list[i].vendor_sub, id_list[i].device_sub, tmp_dev);
+		tmp_dev = pci_get_subsys(id_list[i].vendor_id, id_list[i].device_id, id_list[i].vendor_sub, id_list[i].device_sub, tmp_dev);
 		if (tmp_dev) {
 			/* skip if already in use */
 			list_for_each_entry_safe(hc_tmp, next, &HFCM_obj.ilist, list) {

for chan_misdn-beta-0.1.0.tgz:

diff -urN chan_misdn-beta-0.1.0/chan_misdn.c chan_misdn-beta-0.1.0-fixed/chan_misdn.c
--- chan_misdn-beta-0.1.0/chan_misdn.c	2005-04-01 16:32:10.000000000 +0200
+++ chan_misdn-beta-0.1.0-fixed/chan_misdn.c	2005-04-21 12:28:59.000000000 +0200
@@ -2528,12 +2528,12 @@
 	if ( !strlen(bc->dad) && strlen(bc->keypad)) strcpy(bc->dad,bc->keypad);
 	switch( bc->numplan ) {
 	case NUMPLAN_INTERNATIONAL:
-	  prefix=get_nat_prefix(bc);
+	  prefix=get_internat_prefix(bc);
 	  if (misdn_debug>0) chan_misdn_log(" --> Numplan: Internat. prefix %s\n", prefix);
 	  break;
 	  
 	case NUMPLAN_NATIONAL:
-	  prefix=get_internat_prefix(bc);
+	  prefix=get_nat_prefix(bc);
 	  if (misdn_debug>0) chan_misdn_log(" --> Numplan: Nat. prefix %s\n", prefix);
 	  break;
 	  
for app_pppd-050202.tgz:

diff -urN app_pppd/app_pppd.c app_pppd-fixed/app_pppd.c
--- app_pppd/app_pppd.c	2005-02-02 15:21:52.000000000 +0100
+++ app_pppd-fixed/app_pppd.c	2005-04-27 15:19:28.000000000 +0200
@@ -21,10 +21,13 @@
 
 #include "isdnhdlc.h"
 #include <stdlib.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include <string.h>
 #include <signal.h>
 #include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/resource.h>
 
@@ -171,7 +174,8 @@
 
   if (! _master_fd || ! _slave_name) return 0;
   
-  master = getpt ();
+  // master = getpt ();
+  master=open("/dev/ptmx", O_RDWR|O_NOCTTY|O_NONBLOCK);
   if (master < 0)
     return 0;
   
@@ -215,9 +219,6 @@
 {
   // we really need the info struct and an Asterisk channel
   if (! info || ! info->astch) goto exit_snd;
-
-  // initialize the send HDLC
-  isdnhdlc_out_init (&(info->snd_hdlc), 0, 0);
   
   
   //////////////////////////////////////////////////////////////////////////
@@ -227,14 +228,22 @@
   info->snd_buf_fill_add = read(info->master_fd, info->snd_buf+info->snd_buf_fill, 
 				sizeof(info->snd_buf)-info->snd_buf_fill);
   if (info->snd_buf_fill_add < 0) {
-    ast_log(LOG_DEBUG, "Could not read send data: %s\n", strerror(errno));
-    goto exit_snd;
+    if (errno == EAGAIN) {
+      info->snd_buf_fill_add=0;
+      return;
+    } else {
+      ast_log(LOG_DEBUG, "Could not read send data: %s\n", strerror(errno));
+      goto exit_snd;
+    }
   }
   if (info->snd_buf_fill_add == 0) {
     ast_log(LOG_DEBUG, "EOF\n");
     goto exit_snd;
   }
 
+  // initialize the send HDLC
+  isdnhdlc_out_init (&(info->snd_hdlc), 0, 0);
+
   info->snd_buf_fill += info->snd_buf_fill_add;
   if (info->snd_buf_fill > sizeof(info->snd_buf)) info->snd_buf_fill = sizeof(info->snd_buf);
  
@@ -554,7 +563,7 @@
 
       continue;
     }
-    
+
     if (astch == info->astch) {
       // run receiver ...
       do_rcv_ch(info);     

That's all.
Bye.

-- 
Francesco Lattanzio <f.lattanzio at mediatechnologies.it>