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implement Dhcp;
#
# configure an interface using DHCP
#
include "sys.m";
sys: Sys;
include "draw.m";
include "ip.m";
ip: IP;
IPv4off, IPaddrlen: import IP;
IPaddr: import ip;
get2, get4, put2, put4: import ip;
include "dhcp.m";
dhcpclient: Dhcpclient;
Bootconf, Lease: import dhcpclient;
include "arg.m";
Dhcp: module
{
init: fn(nil: ref Draw->Context, nil: list of string);
};
RetryTime: con 10*1000; # msec
init(nil: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
ip = load IP IP->PATH;
dhcpclient = load Dhcpclient Dhcpclient->PATH;
sys->pctl(Sys->NEWFD|Sys->NEWPGRP, 0 :: 1 :: 2 :: nil);
arg := load Arg Arg->PATH;
arg->init(args);
arg->setusage("dhcp [-bdmnpr] [-g ipgw] [-h hostname] [-x /net] ifcdir [ip [ipmask]]");
trace := 0;
pcfg := 0;
bootp := 0;
monitor := 0;
retry := 0;
noctl := 0;
netdir := "/net";
cfg := Bootconf.new();
while((o := arg->opt()) != 0)
case o {
'b' => bootp = 1;
'd' => trace++;
'g' => cfg.ipgw = arg->earg();
'h' => cfg.puts(Dhcpclient->Ohostname, arg->earg());
'm' => monitor = 1;
'n' => noctl = 1;
'p' => pcfg = 1;
'r' => retry = 1;
'x' => netdir = arg->earg();
* => arg->usage();
}
args = arg->argv();
if(len args == 0)
arg->usage();
ifcdir := hd args;
args = tl args;
if(args != nil){
cfg.ip = hd args;
args = tl args;
if(args != nil){
cfg.ipmask = hd args;
args = tl args;
if(args != nil)
arg->usage();
}
}
arg = nil;
ifcctl: ref Sys->FD;
if(noctl == 0){
ifcctl = sys->open(ifcdir+"/ctl", Sys->OWRITE);
if(ifcctl == nil)
err(sys->sprint("cannot open %s/ctl: %r", ifcdir));
}
etherdir := finddev(ifcdir);
if(etherdir == nil)
err(sys->sprint("cannot find network device in %s/status: %r", ifcdir));
if(etherdir[0] != '/' && etherdir[0] != '#')
etherdir = netdir+"/"+etherdir;
ip->init();
dhcpclient->init();
dhcpclient->tracing(trace);
e: string;
lease: ref Lease;
for(;;){
if(bootp){
(cfg, e) = dhcpclient->bootp(netdir, ifcctl, etherdir+"/addr", cfg);
if(e == nil){
if(cfg != nil)
dhcpclient->applycfg(netdir, ifcctl, cfg);
if(pcfg)
printcfg(cfg);
break;
}
}else{
(cfg, lease, e) = dhcpclient->dhcp(netdir, ifcctl, etherdir+"/addr", cfg, nil); # last is array of int options
if(e == nil){
if(pcfg)
printcfg(cfg);
if(cfg.lease > 0 && monitor)
leasemon(lease.configs, pcfg);
break;
}
}
if(!retry)
err("failed to configure network: "+e);
sys->fprint(sys->fildes(2), "dhcp: failed to configure network: %s; retrying", e);
sys->sleep(RetryTime);
}
}
leasemon(configs: chan of (ref Bootconf, string), pcfg: int)
{
for(;;){
(cfg, e) := <-configs;
if(e != nil)
sys->fprint(sys->fildes(2), "dhcp: %s", e);
if(pcfg)
printcfg(cfg);
}
}
printcfg(cfg: ref Bootconf)
{
sys->print("ip=%s ipmask=%s ipgw=%s iplease=%d\n", cfg.ip, cfg.ipmask, cfg.ipgw, cfg.lease);
}
finddev(ifcdir: string): string
{
fd := sys->open(ifcdir+"/status", Sys->OREAD);
if(fd == nil)
return nil;
buf := array[1024] of byte;
n := sys->read(fd, buf, len buf);
if(n < 0)
return nil;
(nf, l) := sys->tokenize(string buf[0:n], " \n");
if(nf < 2){
sys->werrstr("unexpected format for status file");
return nil;
}
return hd tl l;
}
err(s: string)
{
sys->fprint(sys->fildes(2), "dhcp: %s\n", s);
raise "fail:error";
}
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