add router sanity check, fix mcp race condition

packages/mcp/service/httpd/finish

@@ -1,4 +0,0 @@
-#! /bin/sh
-
-IP=$(cat ip.txt)
-ip addr del $IP dev eth0

packages/mcp/service/httpd/run

@@ -1,17 +1,19 @@
-#! /bin/sh
+#! /bin/sh -e
 
 exec 2>&1
 
+hostname mcp
+
 # Bring up address
 IP=$(cat ip.txt)
-ip addr add $IP dev eth0
-ip monitor | grep -q $IP
+ip addr add $IP dev eth0 || true
 
 # Link in puzzles and web pages
 install -d /var/www
 for d in /opt/*; do
-    if [ -d $d/puzzles ]; then
-        ln -sf $d/puzzles /var/www/$(basename $d)
+    w=/var/www/$(basename $d)
+    if [ -d $d/puzzles ] && ! [ -d $w ]; then
+        ln -sf $d/puzzles $w
     fi
     if [ -d $d/www ]; then
         ln -sf $d/www/* /var/www/

packages/mcp/www/ctf.css

@@ -46,7 +46,7 @@ h1:first-child {
 
 h1:first-child:before {
     letter-spacing: -0.1em;
-    content: "Capture The Flag: ";
+    content: "NSM FIRE: ";
 }
 
 /**** body ****/

packages/octopus/solution.sh

@@ -1,9 +1,9 @@
 #! /bin/sh
 
 port=8888
-host=${1:-[::1]}
+host=[${1:-::1}]
 
-blooper=$(tempfile)
+blooper=/tmp/bloop.$$
 trap "rm $blooper" 0
 
 echo foo | socat -t 0.01 STDIO UDP6:$host:$port | tail -n +5 > $blooper

packages/router/service/router/run

@@ -4,9 +4,19 @@ exec 2>&1
 
 PFX=fd84:b410:3441
 
-hostname router
+log () {
+    echo "router: $@"
+    echo "router: $@" > /dev/console
+}
 
-# We're a router
+if [ $(mount | grep -c /opt/) -gt 1 ]; then
+    log "cannot run alongside other packages" > /dev/console
+    exit 1
+fi
+
+
+# I'm a router
+hostname router
 echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
 
 # Bring up main ethernet interface

packages/router/service/sshd/run

@@ -2,6 +2,6 @@
 
 exec 2>&1
 
-[ -r /etc/passwd ] || echo 'root:$1$xAJ7KwiU$BeKJjYGs9r/hY9Ag4qv4I1:0:0:root:/tmp:/bin/sh' > /etc/passwd
+echo 'root:$1$xAJ7KwiU$BeKJjYGs9r/hY9Ag4qv4I1:0:0:root:/tmp:/bin/sh' > /etc/passwd
 
 exec dropbear -r ./rsa.key -E -F