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implement PPPdial;
#
# Module: ispservice
# Purpose: Simple PPP Dial-on-Demand
# Author: Eric Van Hensbergen (ericvh@lucent.com)
#
# Copyright © 1998-1999 Lucent Technologies Inc. All rights reserved.
# Revisions copyright © 2000-2003 Vita Nuova Holdings Limited. All rights reserved.
#
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
include "cfgfile.m";
cfg: CfgFile;
ConfigFile: import cfg;
include "lock.m";
include "modem.m";
include "script.m";
include "pppclient.m";
ppp: PPPClient;
include "pppgui.m";
PPPdial: module
{
init: fn(nil: ref Draw->Context): string;
connect: fn(): string;
};
context: ref Draw->Context;
modeminfo: ref Modem->ModemInfo;
pppinfo: ref PPPClient->PPPInfo;
scriptinfo: ref Script->ScriptInfo;
isp_number: string; # should be part of pppinfo
lastCdir: ref Sys->Dir; # state of file when last read
DEFAULT_ISP_DB_PATH: con "/services/ppp/isp.cfg"; # contains pppinfo & scriptinfo
DEFAULT_MODEM_DB_PATH: con "/services/ppp/modem.cfg"; # contains modeminfo
MODEM_DB_PATH: con "/usr/inferno/config/modem.cfg"; # contains modeminfo
ISP_DB_PATH: con "/usr/inferno/config/isp.cfg"; # contains pppinfo & scriptinfo
ISP_RETRIES: con 5;
getcfgstring(c: ref ConfigFile, key: string) :string
{
l := c.getcfg(key);
if (l == nil)
return nil;
for(ret := ""; l != nil; l = tl l)
ret+= " " + hd l;
return ret[1:]; # trim the first space
}
configinit()
{
mi: Modem->ModemInfo;
pppi: PPPClient->PPPInfo;
info: list of string;
cfg = load CfgFile CfgFile->PATH;
if (cfg == nil)
raise "fail: load CfgFile";
# Modem Configuration
cfg->verify(DEFAULT_MODEM_DB_PATH, MODEM_DB_PATH);
modemcfg := cfg->init(MODEM_DB_PATH);
if (modemcfg == nil)
raise "fail: read: "+MODEM_DB_PATH;
modeminfo = ref mi;
modeminfo.path = getcfgstring(modemcfg, "PATH");
modeminfo.init = getcfgstring(modemcfg, "INIT");
modeminfo.country = getcfgstring(modemcfg, "COUNTRY");
modeminfo.other = getcfgstring(modemcfg, "OTHER");
modeminfo.errorcorrection = getcfgstring(modemcfg,"CORRECT");
modeminfo.compression = getcfgstring(modemcfg,"COMPRESS");
modeminfo.flowctl = getcfgstring(modemcfg,"FLOWCTL");
modeminfo.rateadjust = getcfgstring(modemcfg,"RATEADJ");
modeminfo.mnponly = getcfgstring(modemcfg,"MNPONLY");
modeminfo.dialtype = getcfgstring(modemcfg,"DIALING");
if(modeminfo.dialtype!="ATDP")
modeminfo.dialtype="ATDT";
cfg->verify(DEFAULT_ISP_DB_PATH, ISP_DB_PATH);
(ok, stat) := sys->stat(ISP_DB_PATH);
if(ok >= 0)
lastCdir = ref stat;
sys->print("cfg->init(%s)\n", ISP_DB_PATH);
# ISP Configuration
pppcfg := cfg->init(ISP_DB_PATH);
if (pppcfg == nil)
raise "fail: Couldn't load ISP configuration file: "+ISP_DB_PATH;
pppinfo = ref pppi;
isp_number = getcfgstring(pppcfg, "NUMBER");
pppinfo.ipaddr = getcfgstring(pppcfg,"IPADDR");
pppinfo.ipmask = getcfgstring(pppcfg,"IPMASK");
pppinfo.peeraddr = getcfgstring(pppcfg,"PEERADDR");
pppinfo.maxmtu = getcfgstring(pppcfg,"MAXMTU");
pppinfo.username = getcfgstring(pppcfg,"USERNAME");
pppinfo.password = getcfgstring(pppcfg,"PASSWORD");
info = pppcfg.getcfg("SCRIPT");
if (info != nil) {
scriptinfo = ref Script->ScriptInfo;
scriptinfo.path = hd info;
scriptinfo.username = pppinfo.username;
scriptinfo.password = pppinfo.password;
} else
scriptinfo = nil;
info = pppcfg.getcfg("TIMEOUT");
if (info != nil)
scriptinfo.timeout = int (hd info);
cfg = nil; # might as well unload it
}
#
# Parts of the following two functions could be generalized
#
isipaddr(a: string): int
{
i, c, ac, np: int = 0;
for(i = 0; i < len a; i++) {
c = a[i];
if(c >= '0' && c <= '9') {
np = 10*np + c - '0';
continue;
}
if (c == '.' && np) {
ac++;
if (np > 255)
return 0;
np = 0;
continue;
}
return 0;
}
return np && np < 256 && ac == 3;
}
# check if there is an existing PPP connection
connected(): int
{
ifd := sys->open("/net/ipifc", Sys->OREAD);
if(ifd == nil)
return 0;
buf := array[1024] of byte;
for(;;) {
(n, d) := sys->dirread(ifd);
if (n <= 0)
return 0;
for(i := 0; i < n; i++)
if(d[i].name[0] <= '9') {
sfd := sys->open("/net/ipifc/"+d[i].name+"/status", Sys->OREAD);
if (sfd == nil)
continue;
ns := sys->read(sfd, buf, len buf);
if (ns <= 0)
continue;
(nflds, flds) := sys->tokenize(string buf[0:ns], " \t\r\n");
if(nflds < 4)
continue;
if (isipaddr(hd tl tl flds))
return 1;
}
}
}
#
# called once when loaded
#
init(ctxt: ref Draw->Context): string
{
sys = load Sys Sys->PATH;
{
ppp = load PPPClient PPPClient->PATH;
if (ppp == nil)
raise "fail: Couldn't load ppp module";
# Contruct Config Tables During Init - may want to change later
# for multiple configs (Software Download Server versus ISP)
configinit();
context = ctxt;
}exception e {
"fail:*" =>
return e;
}
return nil;
}
dialup_cancelled := 0;
connecting := 0;
#
# called each time a translation is needed, to check that we're on line(!)
# eventually this will be replaced by a packet interface that does dial-on-demand
#
connect(): string
{
{
dialup_cancelled = 0;
(ok, stat) := sys->stat(ISP_DB_PATH);
if (ok < 0 || lastCdir == nil || !samefile(*lastCdir, stat))
configinit();
errc := chan of string;
while(!connected()){
if(!connecting) {
connecting = 1;
sync := chan of int;
spawn pppconnect(errc, sync);
<- sync;
return <-errc;
}else{
sys->sleep(2500);
if (dialup_cancelled)
return "fail: dialup cancelled";
}
}
}exception e{
"fail:*" =>
return e;
"*" =>
sys->print("pppdial: caught exception: %s\n", e);
return "fail: internal error: "+e;
}
return nil;
}
pppconnect(errc: chan of string, sync: chan of int)
{
connecting = 1;
sys->pctl(Sys->NEWPGRP, nil);
sync <-= 0;
resp_chan: chan of int;
logger := chan of int;
pppgui := load PPPGUI PPPGUI->PATH;
for (count :=0; count < ISP_RETRIES; count++) {
resp_chan = pppgui->init(context, logger, ppp, nil);
spawn ppp->connect(modeminfo, isp_number, scriptinfo, pppinfo, logger);
x := <-resp_chan;
if (x > 0) {
if (x == 1) {
# alt needed in case calling process has been killed
alt {
errc <-= nil => ;
* => ;
}
} else { # user cancelled dial-in
dialup_cancelled = 1;
alt {
errc <-= "fail: dialup cancelled" => ;
* => ;
}
}
connecting = 0;
return;
}
# else connect failed, go around loop to try again
}
alt {
errc <-= "fail: dialup failed" => ;
* => ;
}
connecting = 0;
}
samefile(d1, d2: Sys->Dir): int
{
return d1.dev==d2.dev && d1.dtype==d2.dtype &&
d1.qid.path==d2.qid.path && d1.qid.vers==d2.qid.vers &&
d1.mtime==d2.mtime;
}
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