Hi all,
I'm trying to write something to fit into a two factor auth mechanism.
I have a CGI script which is called with a phone number and a PIN as
parameters. In the script I use the event socket api to place a call.
The PHP code I'm using to write to the socket is straight out of the
FS docs (can't remember exactly, I think I got it from the wiki). This
is my api command:
api originate {originate_timeout=30}sofia/external/${dExt}@MGC
'&play_and_get_digits(4 4 2 30000 # torvalds-says-linux.wav
torvalds-says-linux.wav foo \d+)'
This all works fine, up to a point. The call is made, the wav is
played. But then PAGD is supposed to put the digits into a channel
var, in this case "foo". But I've been having trouble getting the
value of this channel var *reliably*. If the # key is used to
terminate the input, then I can get the channel var value with
api uuid_getvar $uuid foo
However, if the input is terminated by PAGD because 4 digits have been
entered, then the call is hung up (by FS/PAGD) before I have a chance
to get the value of the channel var. Can anyone help here please? I
suppose I can work around this by increasing the digits to 5 and
telling people to use # to terminate the input, but I'd like to
understand the correct way to use PAGD if possible.
If you think I'm going about this the wrong way entirely, then please
suggest an alternative :-)
My code is below. As I say, lines 1-71 are straight out of the docs.
1 <?php
2
3 $password = "xxxxxx";
4 $port = "xxxx";
5 $host = "127.0.0.1";
6
7 function event_socket_create($host, $port, $password) {
8 $fp = fsockopen($host, $port, $errno, $errdesc)
9 or die("Connection to $host failed");
10 socket_set_blocking($fp,false);
11
12 if ($fp) {
13 while (!feof($fp)) {
14 $buffer = fgets($fp, 1024);
15 usleep(100); //allow time for reponse
16 if (trim($buffer) == "Content-Type: auth/request") {
17 fputs($fp, "auth $password\n\n");
18 break;
19 }
20 }
21 return $fp;
22 }
23 else {
24 return false;
25 }
26 }
27
28 function event_socket_request($fp, $cmd) {
29
30 if ($fp) {
31 fputs($fp, $cmd."\n\n");
32 usleep(200); //allow time for reponse
33
34 $response = "";
35 $i = 0;
36 $contentlength = 0;
37 while (!feof($fp)) {
38 $buffer = fgets($fp, 4096);
39 if ($contentlength > 0) {
40 $response .= $buffer;
41 }
42
43 if ($contentlength == 0) { //if contentlenght is
already don't process again
44 if (strlen(trim($buffer)) > 0) { //run only
if buffer has content
45 $temparray = split(":", trim($buffer));
46 if ($temparray[0] == "Content-Length") {
47 $contentlength = trim($temparray[1]);
48 }
49 }
50 }
51
52 usleep(200); //allow time for reponse
53
54 //optional because of script timeout //don't let
while loop become endless
55 if ($i > 90000) { break; }
56
57 if ($contentlength > 0) { //is contentlength set
58 //stop reading if all content has been read.
59 if (strlen($response) >= $contentlength) {
60 break;
61 }
62 }
63 $i++;
64 }
65
66 return $response;
67 }
68 else {
69 echo "no handle";
70 }
71 }
72
73 function strip_cr($str) {
74 return preg_replace("/\n/",'',$str);
75 }
76
77 $dExt = $_GET['dExt'];
78 if ($dExt) {
79 $fp = event_socket_create($host, $port, $password);
80
81 # Place call and find uuid
82 $cmd = "api originate
{originate_timeout=30}sofia/external/677${dExt}@194.145.191.131
'&play_and_get_digits(4 4 2 30000 # torvalds-says-linux.wav
torvalds-says-linux.wav foo \d+)'";
83 $response = event_socket_request($fp, $cmd);
84 $response = preg_replace('/</','<',$response);
85 $response = preg_replace('/>/','>',$response);
86 $response = strip_cr($response);
87 $bits = preg_split('/\s+/',$response);
88 $uuid = $bits[1];
89
90 echo '<pre>';
91 echo date('H:i:s') . "\n";
92 echo "call placed: $cmd\n";
93 echo "response :$response:\n";
94 echo "uuid $uuid\n";
95
96 # Retrieve channel variable
97 $cmd = "api uuid_getvar $uuid foo";
98 $response = '';
99 while (! $response or $response == '_undef_') {
100 echo "in loop : got _undef_\n";
101 $response = event_socket_request($fp, $cmd);
102 $response = strip_cr($response);
103 }
104 echo "response :$response:\n";
105 echo '</pre>';
106
107 # Close socket
108 fclose($fp);
109 } else {
110 echo 'Request URL in this format: /test.php?dExt=<phone_number>' . "\n";
111 }
112
113 ?>
Cheers,
Rich
--
Once our basic material needs are met - in my utopia, anyway - life
becomes a perpetual celebration in which everyone has a talent to
contribute. But we cannot levitate ourselves into that blessed
condition by wishing it. We need to brace ourselves for a struggle
against terrifying obstacles, both of our own making and imposed by
the natural world. And the first step is to recover from the delusion
that is positive thinking.
-- Barbara Ehrenreich
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