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Get web pages. Post values to a server. Put values to pachube.
In this example, I am going to get a web page from an internal server on my network using a remote Zigduino node. All my machines are running IPv6 out of the box, BUT I do not have global unicast addresses on my network. So I'll need to configure site-local addresses.
There are 4 machines participating in this dance, and each one will need to be configured.
- Client node. We'll start by using the shell, and then finish with the 'wget' test
- Border router node. Needs the rpl-border-router example running.
- Host PC. The machine that the border router is physically connected to needs the most configuration
- Server PC. Somewhere on my internal network is a web server running Apache
Statically assign FEC0::63 to the web server
$ cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). ## SNIP ## # IPv6 static configuration iface eth0 inet6 static address fec0::63 netmask 64 gateway fec0::1
Create a route on the server so it knows how to reach FDFD::/64 nodes.
$ sudo route -A inet6 add fdfd::/64 gw fec0::7 $ sudo route -A inet6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If fdfd::/64 fec0::7 UG 1 0 157 eth0 fe80::/64 :: U 256 0 0 eth0 fec0::/64 :: U 256 0 2 eth0 ::/0 fec0::1 UG 1 0 45 eth0
Configure apache to listen on IPv6
$ cat /etc/apache2/ports.conf #Listen 80 Listen [::]:80
Statically assign FEC0::7 to the instant contiki VM acting as host PC
$ sudo ip -6 addr add fec0::7/64 dev eth13 $ route -A inet6 Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If fec0::7/128 :: Un 0 1 94 lo
Instruct the host PC has to forward packets between networks, between FDFD::/64 and FEC0::/64.
$ sudo sysctl -w net.ipv6.conf.default.forwarding=1 net.ipv6.conf.default.forwarding = 1
Test that the host can ping the server.
$ ping6 fec0::63 PING fec0::63(fec0::63) 56 data bytes 64 bytes from fec0::63: icmp_seq=1 ttl=64 time=2.67 ms 64 bytes from fec0::63: icmp_seq=2 ttl=64 time=0.316 ms
Test that the host can fetch web pages from the server. Obviously, change the URL to a page you know exists on your server.
$ curl -g "http://[fec0::63]/testbed/test.php?op=server"
Array
(
[HTTP_USER_AGENT] => curl/7.19.7 (i486-pc-linux-gnu) libcurl/7.19.7 OpenSSL/0.9.8k zlib/1.2.3.3 libidn/1.15
[HTTP_HOST] => [fec0::63]
[HTTP_ACCEPT] => */*
[PATH] => /usr/local/bin:/usr/bin:/bin
[SERVER_SIGNATURE] => <address>Apache/2.2.12 (Ubuntu) Server at fec0::63 Port 80</address>
...snip...
Next, we bring up the border router on the node attached to the host PC.
$ cd examples/ipv6/rpl-border-router $ make TARGET=avr-zigduino savetarget $ make upload WITH_WEBSERVER=0 WITH_SLIP=1 AVRDUDE_PORT=/dev/ttyUSB0 -j10 $ sudo ../../../tools/tunslip6 aaaa::1/64 -s /dev/ttyUSB0 -B 38400 -v6 $ sudo route -A inet6 add fdfd::/64 dev tun0
Now we can make sure ping from the remote device works. We'll use the shell.
$ cd platform/avr-zigduino/tests/shell $ make upload login AVRDUDE_PORT=/dev/ttyUSB1 -j10
Ping the border router
68.1: Contiki> ping fdfd::3 SEND 13 bytes Sending Echo Request to fdfd:0000:0000:0000:0000:0000:0000:0003 from fdfd:0000:0000:0000:0000:0000:0000:0001 Echo reply received.
Ping the SLIP tunnel
68.1: Contiki> ping aaaa::1 SEND 13 bytes Sending Echo Request to aaaa:0000:0000:0000:0000:0000:0000:0001 from aaaa:0000:0000:0000:0011:22ff:fe33:4401 Echo reply received.
Ping the host PC
68.1: Contiki> ping fec0::7 SEND 13 bytes Sending Echo Request to fec0:0000:0000:0000:0000:0000:0000:0007 from fdfd:0000:0000:0000:0000:0000:0000:0001 Echo reply received.
Ping the server
68.1: Contiki> ping fec0::63 SEND 14 bytes Sending Echo Request to fec0:0000:0000:0000:0000:0000:0000:0063 from fdfd:0000:0000:0000:0000:0000:0000:0001 Echo reply received.
Finally, everything is ready! Time to pull that page using a remote node. This uses a version of the wget example I modified for this walk-through. It's in platform/avr-zigduino/tests/wget. Specifically, I...
- Enabled IPv6
- Removed cfs, so doesn't save the file, just dumps the results to stdout
- Removed input via stdin to specificy the url, it's just hard-coded.
First, edit the URL in wget.c to point to a page you know will work on your server.
$ cd platform/avr-zigduino/tests/wget $ make TARGET=avr-zigduino savetarget $ make -j10 $ make upload login AVRDUDE_PORT=/dev/ttyUSB1
Voila!
*******Booting Contiki-2.5-1356-g0ffffa2*******
MAC address 2:11:22:ff:fe:33:44:1
nullmac sicslowmac, channel 26
Routing Enabled
Autostart other processes
IP addresses [4 max]
fdfd::1
fe80::11:22ff:fe33:4401
wget http://[fec0::63]/testbed/test.php?op=server...
Connecting to [fec0::63]:80 for /testbed/test.php?op=server...Request sent...
Downloading (411 bytes)
Array
(
[HTTP_HOST] => [fec0::63]
[HTTP_CONNECTION] => close
[HTTP_USER_AGENT] => Contiki/2.2.2 (; http://www.sics.se/contiki/)
[PATH] => /usr/local/bin:/usr/bin:/bin
[SERVER_SIGNATURE] => <address>Apache/2.2.12 (Ubuntu) Server at fec0::63 Port 80</address>
[SERVER_SOFTWARE] => Apache/2.2.12 (Ubuntu)
[SERVER_NAME] => fec0::63
[SERVER_ADDR] => fec0::63
[SERVER_PORT] => 80
Downloading (965 bytes)
[REMOTE_ADDR] => fdfd::1
[DOCUMENT_ROOT] => /var/www
[SERVER_ADMIN] => webmaster@localhost
[SCRIPT_FILENAME] => /var/www/testbed/test.php
[REMOTE_PORT] => 1025
[GATEWAY_INTERFACE] => CGI/1.1
[SERVER_PROTOCOL] => HTTP/1.0
[REQUEST_METHOD] => GET
[QUERY_STRING] => op=server
[REQUEST_URI] => /testbed/test.php?op=server
[SCRIPT_NAME] => /testbed/test.php
[PHP_SELF] => /testbed/test.php
[REQUEST_TIME] => 1313300218
[argv] => Array
(
[0] => op=server
)
[argc] => 1
)
Finished downloading 965 bytes.
- Move wget to the shell.
- Construct a post request. The best route may be to add a post flag to webclient_get. Certainly would not want to rewrite what's already there.
- Post to Pachube