1710 lines
36 KiB
C
1710 lines
36 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
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* See /doc/license/gpl-2.0.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 9front's team.
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* See /doc/license/9front-mit for details about the licensing.
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* See http://git.9front.org/plan9front/plan9front/HEAD/info.html for a list of authors.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <envvars.h>
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#include <ip.h>
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#include <bio.h>
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#include <ndb.h>
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#include "dat.h"
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/*
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* ala rfc2131
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*/
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enum {
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Maxloglen = 1024,
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};
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typedef struct Req Req;
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struct Req
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{
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int fd; /* for reply */
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Bootp *bp;
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Udphdr *up;
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uint8_t *e; /* end of received message */
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uint8_t *p; /* options pointer */
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uint8_t *max; /* max end of reply */
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/* expanded to v6 */
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uint8_t ciaddr[IPaddrlen];
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uint8_t giaddr[IPaddrlen];
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/* parsed options */
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int p9request; /* flag: this is a bootp with plan9 options */
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int genrequest; /* flag: this is a bootp with generic options */
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int dhcptype; /* dhcp message type */
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int leasetime; /* dhcp lease */
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uint8_t ip[IPaddrlen]; /* requested address */
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uint8_t server[IPaddrlen]; /* server address */
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char msg[ERRMAX]; /* error message */
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char vci[32]; /* vendor class id */
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char *id; /* client id */
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uint8_t requested[32]; /* requested params */
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uint8_t vendorclass[32];
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char cputype[32-3];
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Info gii; /* about target network */
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Info ii; /* about target system */
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int staticbinding;
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uint8_t buf[2*1024]; /* message buffer */
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};
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#define TFTP "/lib/tftpd"
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char *blog = "ipboot";
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char mysysname[64];
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Ipifc *ipifcs;
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int debug;
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int nobootp;
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int32_t now;
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int slowstat, slowdyn;
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char net[256];
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int pptponly; /* only answer request that came from the pptp server */
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int mute, mutestat;
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int minlease = MinLease;
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int staticlease = StaticLease;
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uint64_t start;
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static int v6opts;
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/* option magic */
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char plan9opt[4] = { 'p', '9', ' ', ' ' };
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char genericopt[4] = { 0x63, 0x82, 0x53, 0x63 };
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/* well known addresses */
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uint8_t zeros[Maxhwlen];
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/* option debug buffer */
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char optbuf[1024];
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char *op;
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char *oe = optbuf + sizeof(optbuf);
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char *optname[256] =
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{
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[OBend] "end",
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[OBpad] "pad",
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[OBmask] "mask",
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[OBtimeoff] "timeoff",
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[OBrouter] "router",
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[OBtimeserver] "time",
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[OBnameserver] "name",
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[OBdnserver] "dns",
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[OBlogserver] "log",
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[OBcookieserver] "cookie",
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[OBlprserver] "lpr",
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[OBimpressserver] "impress",
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[OBrlserver] "rl",
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[OBhostname] "host",
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[OBbflen] "bflen",
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[OBdumpfile] "dumpfile",
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[OBdomainname] "dom",
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[OBswapserver] "swap",
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[OBrootpath] "rootpath",
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[OBextpath] "extpath",
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[OBipforward] "ipforward",
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[OBnonlocal] "nonlocal",
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[OBpolicyfilter] "policyfilter",
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[OBmaxdatagram] "maxdatagram",
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[OBttl] "ttl",
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[OBpathtimeout] "pathtimeout",
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[OBpathplateau] "pathplateau",
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[OBmtu] "mtu",
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[OBsubnetslocal] "subnetslocal",
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[OBbaddr] "baddr",
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[OBdiscovermask] "discovermask",
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[OBsupplymask] "supplymask",
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[OBdiscoverrouter] "discoverrouter",
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[OBrsserver] "rsserver",
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[OBstaticroutes] "staticroutes",
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[OBtrailerencap] "trailerencap",
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[OBarptimeout] "arptimeout",
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[OBetherencap] "etherencap",
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[OBtcpttl] "tcpttl",
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[OBtcpka] "tcpka",
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[OBtcpkag] "tcpkag",
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[OBnisdomain] "nisdomain",
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[OBniserver] "niserver",
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[OBntpserver] "ntpserver",
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[OBvendorinfo] "vendorinfo",
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[OBnetbiosns] "NBns",
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[OBnetbiosdds] "NBdds",
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[OBnetbiostype] "NBtype",
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[OBnetbiosscope] "NBscope",
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[OBxfontserver] "xfont",
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[OBxdispmanager] "xdisp",
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[OBnisplusdomain] "NPdomain",
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[OBnisplusserver] "NP",
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[OBhomeagent] "homeagent",
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[OBsmtpserver] "smtp",
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[OBpop3server] "pop3",
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[OBnntpserver] "nntp",
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[OBwwwserver] "www",
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[OBfingerserver] "finger",
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[OBircserver] "ircserver",
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[OBstserver] "stserver",
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[OBstdaserver] "stdaserver",
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/* dhcp options */
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[ODipaddr] "ip",
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[ODlease] "leas",
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[ODoverload] "overload",
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[ODtype] "typ",
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[ODserverid] "sid",
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[ODparams] "params",
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[ODmessage] "message",
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[ODmaxmsg] "maxmsg",
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[ODrenewaltime] "renewaltime",
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[ODrebindingtime] "rebindingtime",
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[ODvendorclass] "vendorclass",
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[ODclientid] "cid",
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[ODtftpserver] "tftpserver",
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[ODbootfile] "bf",
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};
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void addropt(Req*, int, uint8_t*);
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void addrsopt(Req*, int, uint8_t**, int);
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void arpenter(uint8_t*, uint8_t*);
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void bootp(Req*);
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void byteopt(Req*, int, uint8_t);
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void dhcp(Req*);
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void fatal(int, char*, ...);
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void hexopt(Req*, int, char*);
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void logdhcp(Req*);
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void logdhcpout(Req *, char *);
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void longopt(Req*, int, int32_t);
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void maskopt(Req*, int, uint8_t*);
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void miscoptions(Req*, uint8_t*);
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int openlisten(char *net);
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void p9addrsopt(Req *rp, int t, uint8_t **ip, int i);
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void parseoptions(Req*);
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void proto(Req*, int);
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void rcvdecline(Req*);
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void rcvdiscover(Req*);
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void rcvinform(Req*);
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void rcvrelease(Req*);
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void rcvrequest(Req*);
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int readlast(int, uint8_t*, int);
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char* readsysname(void);
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void remrequested(Req*, int);
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void sendack(Req*, uint8_t*, int, int);
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void sendnak(Req*, char*);
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void sendoffer(Req*, uint8_t*, int);
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void stringopt(Req*, int, char*);
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void termopt(Req*);
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int validip(uint8_t*);
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void vectoropt(Req*, int, uint8_t*, int);
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void warning(int, char*, ...);
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void
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timestamp(char *tag)
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{
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uint64_t t;
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t = nsec()/1000;
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syslog(0, blog, "%s %lludµs", tag, t - start);
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}
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void
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usage(void)
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{
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fprint(2, "usage: dhcp [-dmnprsSZ] [-f directory] [-M minlease] "
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"[-x netmtpt] [-Z staticlease] addr n [addr n] ...\n");
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exits("usage");
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}
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void
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main(int argc, char **argv)
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{
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int i, n, fd;
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uint8_t ip[IPaddrlen];
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Req r;
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setnetmtpt(net, sizeof net, nil);
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fmtinstall('E', eipfmt);
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fmtinstall('I', eipfmt);
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fmtinstall('V', eipfmt);
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fmtinstall('M', eipfmt);
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ARGBEGIN {
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case '6':
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v6opts = 1;
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break;
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case 'd':
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debug = 1;
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break;
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case 'f':
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ndbfile = EARGF(usage());
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break;
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case 'm':
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mute = 1;
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break;
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case 'M':
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minlease = atoi(EARGF(usage()));
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if(minlease <= 0)
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minlease = MinLease;
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break;
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case 'n':
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nobootp = 1;
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break;
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case 'p':
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pptponly = 1;
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break;
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case 'r':
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mutestat = 1;
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break;
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case 's':
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slowstat = 1;
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break;
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case 'S':
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slowdyn = 1;
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break;
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case 'x':
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setnetmtpt(net, sizeof net, EARGF(usage()));
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break;
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case 'Z':
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staticlease = atoi(EARGF(usage()));
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if(staticlease <= 0)
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staticlease = StaticLease;
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break;
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default:
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usage();
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break;
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} ARGEND;
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while(argc > 1){
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parseip(ip, argv[0]);
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if(!validip(ip))
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usage();
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n = atoi(argv[1]);
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if(n <= 0)
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usage();
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initbinding(ip, n);
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argc -= 2;
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argv += 2;
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}
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/* for debugging */
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for(i = 0; i < 256; i++)
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if(optname[i] == 0)
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optname[i] = smprint("%d", i);
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/* what is my name? */
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strcpy(mysysname, readsysname());
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/* put process in background */
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if(!debug)
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switch(sys_rfork(RFNOTEG|RFPROC|RFFDG)) {
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case -1:
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fatal(1, "fork");
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case 0:
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break;
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default:
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exits(0);
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}
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if (chdir(TFTP) < 0)
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warning(1, "can't change directory to %s", TFTP);
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fd = openlisten(net);
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for(;;){
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memset(&r, 0, sizeof(r));
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r.fd = fd;
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n = readlast(r.fd, r.buf, sizeof(r.buf));
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if(n < Udphdrsize)
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fatal(1, "error reading requests");
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start = nsec()/1000;
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op = optbuf;
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*op = 0;
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proto(&r, n);
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if(r.id != nil)
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free(r.id);
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}
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}
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void
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proto(Req *rp, int n)
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{
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uint8_t relip[IPaddrlen];
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char buf[64];
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now = time(0);
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rp->e = rp->buf + n;
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rp->bp = (Bootp*)rp->buf;
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rp->up = (Udphdr*)rp->buf;
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if (ipcmp(rp->up->laddr, IPv4bcast) == 0)
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ipmove(rp->up->laddr, rp->up->ifcaddr);
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rp->max = rp->buf + Udphdrsize + MINSUPPORTED - IPUDPHDRSIZE;
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rp->p = rp->bp->optdata;
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v4tov6(rp->giaddr, rp->bp->giaddr);
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v4tov6(rp->ciaddr, rp->bp->ciaddr);
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if(pptponly && rp->bp->htype != 0)
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return;
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ipifcs = readipifc(net, ipifcs, -1);
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if(validip(rp->giaddr))
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ipmove(relip, rp->giaddr);
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else if(validip(rp->up->raddr))
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ipmove(relip, rp->up->raddr);
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else
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ipmove(relip, rp->up->laddr);
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if(rp->e < (uint8_t*)rp->bp->sname){
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warning(0, "packet too short");
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return;
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}
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if(rp->bp->op != Bootrequest){
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warning(0, "not bootrequest");
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return;
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}
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if(rp->e >= rp->bp->optdata){
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if(memcmp(rp->bp->optmagic, plan9opt, sizeof(rp->bp->optmagic)) == 0)
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rp->p9request = 1;
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if(memcmp(rp->bp->optmagic, genericopt, sizeof(rp->bp->optmagic)) == 0) {
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rp->genrequest = 1;
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parseoptions(rp);
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}
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}
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rp->p = rp->bp->optdata;
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/* If no id is specified, make one from the hardware address
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* of the target. We assume all zeros is not a hardware address
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* which could be a mistake.
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*/
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if(rp->id == nil){
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if(rp->bp->hlen > Maxhwlen){
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warning(0, "hlen %d", rp->bp->hlen);
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return;
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}
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if(memcmp(zeros, rp->bp->chaddr, rp->bp->hlen) == 0){
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warning(0, "no chaddr");
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return;
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}
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sprint(buf, "hwa%2.2ux_", rp->bp->htype);
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rp->id = tohex(buf, rp->bp->chaddr, rp->bp->hlen);
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}
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/* info about gateway */
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if(lookupip(relip, &rp->gii, 1) < 0){
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warning(0, "lookupip failed");
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return;
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}
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/* info about target system */
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if(lookup(rp->bp, &rp->ii, &rp->gii) == 0)
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if(rp->ii.indb && rp->ii.dhcpgroup[0] == 0)
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rp->staticbinding = 1;
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if(rp->dhcptype)
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dhcp(rp);
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else
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bootp(rp);
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timestamp("done");
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}
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static void
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slowdelay(Req *rp)
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{
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if(slowstat && rp->staticbinding || slowdyn && !rp->staticbinding)
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sleep(2000);
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}
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void
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dhcp(Req *rp)
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{
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logdhcp(rp);
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switch(rp->dhcptype){
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case Discover:
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slowdelay(rp);
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rcvdiscover(rp);
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break;
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case Request:
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rcvrequest(rp);
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break;
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case Decline:
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rcvdecline(rp);
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break;
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case Release:
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rcvrelease(rp);
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break;
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case Inform:
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rcvinform(rp);
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break;
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}
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}
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void
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rcvdiscover(Req *rp)
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{
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Binding *b, *nb;
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if(rp->staticbinding){
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sendoffer(rp, rp->ii.ipaddr, (staticlease > minlease? staticlease: minlease));
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return;
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}
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/*
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* first look for an outstanding offer
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*/
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b = idtooffer(rp->id, &rp->gii);
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|
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/*
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* rfc2131 says:
|
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* If an address is available, the new address
|
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* SHOULD be chosen as follows:
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*
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* o The client's current address as recorded in the client's current
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* binding, ELSE
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*
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* o The client's previous address as recorded in the client's (now
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* expired or released) binding, if that address is in the server's
|
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* pool of available addresses and not already allocated, ELSE
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*
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* o The address requested in the 'Requested IP Address' option, if that
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* address is valid and not already allocated, ELSE
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*
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* o A new address allocated from the server's pool of available
|
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* addresses; the address is selected based on the subnet from which
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* the message was received (if 'giaddr' is 0) or on the address of
|
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* the relay agent that forwarded the message ('giaddr' when not 0).
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*/
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if(b == nil){
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b = idtobinding(rp->id, &rp->gii, 1);
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if(b && b->boundto && strcmp(b->boundto, rp->id) != 0)
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if(validip(rp->ip) && samenet(rp->ip, &rp->gii)){
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nb = iptobinding(rp->ip, 0);
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if(nb && nb->lease < now)
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b = nb;
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}
|
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}
|
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if(b == nil){
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warning(0, "!Discover(%s via %I): no binding %I",
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rp->id, rp->gii.ipaddr, rp->ip);
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return;
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}
|
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mkoffer(b, rp->id, rp->leasetime);
|
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sendoffer(rp, b->ip, b->offer);
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}
|
|
|
|
void
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rcvrequest(Req *rp)
|
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{
|
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Binding *b;
|
|
|
|
if(validip(rp->server)){
|
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/* this is a reply to an offer - SELECTING */
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|
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/* check for hard assignment */
|
|
if(rp->staticbinding){
|
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if(forme(rp->server))
|
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sendack(rp, rp->ii.ipaddr,
|
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(staticlease > minlease? staticlease:
|
|
minlease), 1);
|
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else
|
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warning(0, "!Request(%s via %I): for server %I not me",
|
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rp->id, rp->gii.ipaddr, rp->server);
|
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return;
|
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}
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|
|
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b = idtooffer(rp->id, &rp->gii);
|
|
|
|
/* if we don't have an offer, nak */
|
|
if(b == nil){
|
|
warning(0, "!Request(%s via %I): no offer",
|
|
rp->id, rp->gii.ipaddr);
|
|
if(forme(rp->server))
|
|
sendnak(rp, "no offer for you");
|
|
return;
|
|
}
|
|
|
|
/* if not for me, retract offer */
|
|
if(!forme(rp->server)){
|
|
b->expoffer = 0;
|
|
warning(0, "!Request(%s via %I): for server %I not me",
|
|
rp->id, rp->gii.ipaddr, rp->server);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* if the client is confused about what we offered, nak.
|
|
* client really shouldn't be specifying this when selecting
|
|
*/
|
|
if(validip(rp->ip) && ipcmp(rp->ip, b->ip) != 0){
|
|
warning(0, "!Request(%s via %I): requests %I, not %I",
|
|
rp->id, rp->gii.ipaddr, rp->ip, b->ip);
|
|
sendnak(rp, "bad ip address option");
|
|
return;
|
|
}
|
|
if(commitbinding(b) < 0){
|
|
warning(0, "!Request(%s via %I): can't commit %I",
|
|
rp->id, rp->gii.ipaddr, b->ip);
|
|
sendnak(rp, "can't commit binding");
|
|
return;
|
|
}
|
|
sendack(rp, b->ip, b->offer, 1);
|
|
} else if(validip(rp->ip)){
|
|
/*
|
|
* checking address/net - INIT-REBOOT
|
|
*
|
|
* This is a rebooting client that remembers its old
|
|
* address.
|
|
*/
|
|
/* check for hard assignment */
|
|
if(rp->staticbinding){
|
|
if(memcmp(rp->ip, rp->ii.ipaddr, IPaddrlen) != 0){
|
|
warning(0, "!Request(%s via %I): %I not valid for %E",
|
|
rp->id, rp->gii.ipaddr, rp->ip, rp->bp->chaddr);
|
|
sendnak(rp, "not valid");
|
|
}
|
|
sendack(rp, rp->ii.ipaddr, (staticlease > minlease?
|
|
staticlease: minlease), 1);
|
|
return;
|
|
}
|
|
|
|
/* make sure the network makes sense */
|
|
if(!samenet(rp->ip, &rp->gii)){
|
|
warning(0, "!Request(%s via %I): bad forward of %I",
|
|
rp->id, rp->gii.ipaddr, rp->ip);
|
|
sendnak(rp, "wrong network");
|
|
return;
|
|
}
|
|
b = iptobinding(rp->ip, 0);
|
|
if(b == nil){
|
|
warning(0, "!Request(%s via %I): no binding for %I",
|
|
rp->id, rp->gii.ipaddr, rp->ip);
|
|
return;
|
|
}
|
|
if(memcmp(rp->ip, b->ip, IPaddrlen) != 0 || now > b->lease){
|
|
warning(0, "!Request(%s via %I): %I not valid",
|
|
rp->id, rp->gii.ipaddr, rp->ip);
|
|
sendnak(rp, "not valid");
|
|
return;
|
|
}
|
|
b->offer = b->lease - now;
|
|
sendack(rp, b->ip, b->offer, 1);
|
|
} else if(validip(rp->ciaddr)){
|
|
/*
|
|
* checking address - RENEWING or REBINDING
|
|
*
|
|
* these states are indistinguishable in our action. The only
|
|
* difference is how close to lease expiration the client is.
|
|
* If it is really close, it broadcasts the request hoping that
|
|
* some server will answer.
|
|
*/
|
|
|
|
/* check for hard assignment */
|
|
if(rp->staticbinding){
|
|
if(ipcmp(rp->ciaddr, rp->ii.ipaddr) != 0){
|
|
warning(0, "!Request(%s via %I): %I not valid",
|
|
rp->id, rp->gii.ipaddr, rp->ciaddr);
|
|
sendnak(rp, "not valid");
|
|
}
|
|
sendack(rp, rp->ii.ipaddr, (staticlease > minlease?
|
|
staticlease: minlease), 1);
|
|
return;
|
|
}
|
|
|
|
/* make sure the network makes sense */
|
|
if(!samenet(rp->ciaddr, &rp->gii)){
|
|
warning(0, "!Request(%s via %I): bad forward of %I",
|
|
rp->id, rp->gii.ipaddr, rp->ip);
|
|
sendnak(rp, "wrong network");
|
|
return;
|
|
}
|
|
b = iptobinding(rp->ciaddr, 0);
|
|
if(b == nil){
|
|
warning(0, "!Request(%s via %I): no binding for %I",
|
|
rp->id, rp->gii.ipaddr, rp->ciaddr);
|
|
return;
|
|
}
|
|
if(ipcmp(rp->ciaddr, b->ip) != 0){
|
|
warning(0, "!Request(%I via %s): %I not valid",
|
|
rp->id, rp->gii.ipaddr, rp->ciaddr);
|
|
sendnak(rp, "invalid ip address");
|
|
return;
|
|
}
|
|
mkoffer(b, rp->id, rp->leasetime);
|
|
if(commitbinding(b) < 0){
|
|
warning(0, "!Request(%s via %I): can't commit %I",
|
|
rp->id, rp->gii.ipaddr, b->ip);
|
|
sendnak(rp, "can't commit binding");
|
|
return;
|
|
}
|
|
sendack(rp, b->ip, b->offer, 1);
|
|
}
|
|
}
|
|
|
|
void
|
|
rcvdecline(Req *rp)
|
|
{
|
|
Binding *b;
|
|
char buf[64];
|
|
|
|
if(rp->staticbinding)
|
|
return;
|
|
|
|
b = idtooffer(rp->id, &rp->gii);
|
|
if(b == nil){
|
|
warning(0, "!Decline(%s via %I): no binding",
|
|
rp->id, rp->gii.ipaddr);
|
|
return;
|
|
}
|
|
|
|
/* mark ip address as in use */
|
|
snprint(buf, sizeof(buf), "declined by %s", rp->id);
|
|
mkoffer(b, buf, 0x7fffffff);
|
|
commitbinding(b);
|
|
}
|
|
|
|
void
|
|
rcvrelease(Req *rp)
|
|
{
|
|
Binding *b;
|
|
|
|
if(rp->staticbinding)
|
|
return;
|
|
|
|
b = idtobinding(rp->id, &rp->gii, 0);
|
|
if(b == nil){
|
|
warning(0, "!Release(%s via %I): no binding",
|
|
rp->id, rp->gii.ipaddr);
|
|
return;
|
|
}
|
|
if(strcmp(rp->id, b->boundto) != 0){
|
|
warning(0, "!Release(%s via %I): invalid release of %I",
|
|
rp->id, rp->gii.ipaddr, rp->ip);
|
|
return;
|
|
}
|
|
warning(0, "Release(%s via %I): releasing %I", b->boundto, rp->gii.ipaddr, b->ip);
|
|
if(releasebinding(b, rp->id) < 0)
|
|
warning(0, "release: couldn't release");
|
|
}
|
|
|
|
void
|
|
rcvinform(Req *rp)
|
|
{
|
|
Binding *b;
|
|
|
|
if(rp->staticbinding){
|
|
sendack(rp, rp->ii.ipaddr, 0, 0);
|
|
return;
|
|
}
|
|
|
|
b = iptobinding(rp->ciaddr, 0);
|
|
if(b == nil){
|
|
warning(0, "!Inform(%s via %I): no binding for %I",
|
|
rp->id, rp->gii.ipaddr, rp->ip);
|
|
return;
|
|
}
|
|
sendack(rp, b->ip, 0, 0);
|
|
}
|
|
|
|
int
|
|
setsiaddr(uint8_t *siaddr, uint8_t *saddr, uint8_t *laddr)
|
|
{
|
|
if(ipcmp(saddr, IPnoaddr) != 0){
|
|
v6tov4(siaddr, saddr);
|
|
return 0;
|
|
} else {
|
|
v6tov4(siaddr, laddr);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
int
|
|
ismuted(Req *rp)
|
|
{
|
|
return mute || (mutestat && rp->staticbinding);
|
|
}
|
|
|
|
void
|
|
sendoffer(Req *rp, uint8_t *ip, int offer)
|
|
{
|
|
int n;
|
|
uint16_t flags;
|
|
Bootp *bp;
|
|
Udphdr *up;
|
|
|
|
bp = rp->bp;
|
|
up = rp->up;
|
|
|
|
/*
|
|
* set destination
|
|
*/
|
|
flags = nhgets(bp->flags);
|
|
if(validip(rp->giaddr)){
|
|
ipmove(up->raddr, rp->giaddr);
|
|
hnputs(up->rport, 67);
|
|
} else if(flags & Fbroadcast){
|
|
ipmove(up->raddr, IPv4bcast);
|
|
hnputs(up->rport, 68);
|
|
} else {
|
|
ipmove(up->raddr, ip);
|
|
if(bp->htype == 1)
|
|
arpenter(up->raddr, bp->chaddr);
|
|
hnputs(up->rport, 68);
|
|
}
|
|
|
|
/*
|
|
* fill in standard bootp part
|
|
*/
|
|
bp->op = Bootreply;
|
|
bp->hops = 0;
|
|
hnputs(bp->secs, 0);
|
|
memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
|
|
v6tov4(bp->giaddr, rp->giaddr);
|
|
v6tov4(bp->yiaddr, ip);
|
|
setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
|
|
strncpy(bp->sname, mysysname, sizeof(bp->sname));
|
|
strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
|
|
|
|
/*
|
|
* set options
|
|
*/
|
|
byteopt(rp, ODtype, Offer);
|
|
longopt(rp, ODlease, offer);
|
|
addropt(rp, ODserverid, up->laddr);
|
|
miscoptions(rp, ip);
|
|
termopt(rp);
|
|
|
|
logdhcpout(rp, "Offer");
|
|
|
|
/*
|
|
* send
|
|
*/
|
|
n = rp->p - rp->buf;
|
|
if(!ismuted(rp) && jehanne_write(rp->fd, rp->buf, n) != n)
|
|
warning(0, "offer: write failed: %r");
|
|
}
|
|
|
|
void
|
|
sendack(Req *rp, uint8_t *ip, int offer, int sendlease)
|
|
{
|
|
int n;
|
|
uint16_t flags;
|
|
Bootp *bp;
|
|
Udphdr *up;
|
|
|
|
bp = rp->bp;
|
|
up = rp->up;
|
|
|
|
/*
|
|
* set destination
|
|
*/
|
|
flags = nhgets(bp->flags);
|
|
if(validip(rp->giaddr)){
|
|
ipmove(up->raddr, rp->giaddr);
|
|
hnputs(up->rport, 67);
|
|
} else if(flags & Fbroadcast){
|
|
ipmove(up->raddr, IPv4bcast);
|
|
hnputs(up->rport, 68);
|
|
} else {
|
|
ipmove(up->raddr, ip);
|
|
if(bp->htype == 1)
|
|
arpenter(up->raddr, bp->chaddr);
|
|
hnputs(up->rport, 68);
|
|
}
|
|
|
|
/*
|
|
* fill in standard bootp part
|
|
*/
|
|
bp->op = Bootreply;
|
|
bp->hops = 0;
|
|
hnputs(bp->secs, 0);
|
|
v6tov4(bp->giaddr, rp->giaddr);
|
|
v6tov4(bp->yiaddr, ip);
|
|
setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
|
|
strncpy(bp->sname, mysysname, sizeof(bp->sname));
|
|
strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
|
|
|
|
/*
|
|
* set options
|
|
*/
|
|
byteopt(rp, ODtype, Ack);
|
|
if(sendlease){
|
|
longopt(rp, ODlease, offer);
|
|
}
|
|
addropt(rp, ODserverid, up->laddr);
|
|
miscoptions(rp, ip);
|
|
termopt(rp);
|
|
|
|
logdhcpout(rp, "Ack");
|
|
|
|
/*
|
|
* send
|
|
*/
|
|
n = rp->p - rp->buf;
|
|
if(!ismuted(rp) && jehanne_write(rp->fd, rp->buf, n) != n)
|
|
warning(0, "ack: write failed: %r");
|
|
}
|
|
|
|
void
|
|
sendnak(Req *rp, char *msg)
|
|
{
|
|
int n;
|
|
Bootp *bp;
|
|
Udphdr *up;
|
|
|
|
bp = rp->bp;
|
|
up = rp->up;
|
|
|
|
/*
|
|
* set destination (always broadcast)
|
|
*/
|
|
if(validip(rp->giaddr)){
|
|
ipmove(up->raddr, rp->giaddr);
|
|
hnputs(up->rport, 67);
|
|
} else {
|
|
ipmove(up->raddr, IPv4bcast);
|
|
hnputs(up->rport, 68);
|
|
}
|
|
|
|
/*
|
|
* fill in standard bootp part
|
|
*/
|
|
bp->op = Bootreply;
|
|
bp->hops = 0;
|
|
hnputs(bp->secs, 0);
|
|
v6tov4(bp->giaddr, rp->giaddr);
|
|
memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
|
|
memset(bp->yiaddr, 0, sizeof(bp->yiaddr));
|
|
memset(bp->siaddr, 0, sizeof(bp->siaddr));
|
|
|
|
/*
|
|
* set options
|
|
*/
|
|
byteopt(rp, ODtype, Nak);
|
|
addropt(rp, ODserverid, up->laddr);
|
|
if(msg)
|
|
stringopt(rp, ODmessage, msg);
|
|
if(strncmp(rp->id, "id", 2) == 0)
|
|
hexopt(rp, ODclientid, rp->id+2);
|
|
termopt(rp);
|
|
|
|
logdhcpout(rp, "Nak");
|
|
|
|
/*
|
|
* send nak
|
|
*/
|
|
n = rp->p - rp->buf;
|
|
if(!ismuted(rp) && jehanne_write(rp->fd, rp->buf, n) != n)
|
|
warning(0, "nak: write failed: %r");
|
|
}
|
|
|
|
void
|
|
bootp(Req *rp)
|
|
{
|
|
int n;
|
|
Bootp *bp;
|
|
Udphdr *up;
|
|
uint16_t flags;
|
|
Iplifc *lifc;
|
|
Info *iip;
|
|
|
|
warning(0, "bootp %s %I->%I from %s via %I, file %s",
|
|
rp->genrequest? "generic": (rp->p9request? "p9": ""),
|
|
rp->up->raddr, rp->up->laddr,
|
|
rp->id, rp->gii.ipaddr,
|
|
rp->bp->file);
|
|
|
|
if(nobootp)
|
|
return;
|
|
|
|
bp = rp->bp;
|
|
up = rp->up;
|
|
iip = &rp->ii;
|
|
|
|
if(rp->staticbinding == 0){
|
|
warning(0, "bootp from unknown %s via %I", rp->id, rp->gii.ipaddr);
|
|
return;
|
|
}
|
|
|
|
/* ignore if not for us */
|
|
if(*bp->sname){
|
|
if(strcmp(bp->sname, mysysname) != 0){
|
|
bp->sname[20] = 0;
|
|
warning(0, "bootp for server %s", bp->sname);
|
|
return;
|
|
}
|
|
} else
|
|
slowdelay(rp);
|
|
|
|
/* ignore file for sgi arcs command bootp(); */
|
|
if(strcmp(bp->file, ";") == 0)
|
|
*bp->file = 0;
|
|
|
|
/* ignore if we don't know what file to load */
|
|
if(*bp->file == 0){
|
|
if(rp->genrequest && *iip->bootf2) /* if not plan 9 & have alternate file... */
|
|
strncpy(bp->file, iip->bootf2, sizeof(bp->file));
|
|
else if(*iip->bootf)
|
|
strncpy(bp->file, iip->bootf, sizeof(bp->file));
|
|
else if(*bp->sname) /* if we were asked, respond no matter what */
|
|
bp->file[0] = '\0';
|
|
else {
|
|
warning(0, "no bootfile for %I", iip->ipaddr);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* ignore if the file is unreadable */
|
|
if((!rp->genrequest) && bp->file[0] && access(bp->file, AREAD) < 0){
|
|
warning(0, "inaccessible bootfile1 %s", bp->file);
|
|
return;
|
|
}
|
|
|
|
bp->op = Bootreply;
|
|
v6tov4(bp->yiaddr, iip->ipaddr);
|
|
if(rp->p9request){
|
|
warning(0, "p9bootp: %I", iip->ipaddr);
|
|
memmove(bp->optmagic, plan9opt, 4);
|
|
if(iip->gwip == 0)
|
|
v4tov6(iip->gwip, bp->giaddr);
|
|
rp->p += sprint((char*)rp->p, "%V %I %I %I", iip->ipmask+IPv4off, iip->fsip,
|
|
iip->auip, iip->gwip);
|
|
sprint(optbuf, "%s", (char*)(bp->optmagic));
|
|
} else if(rp->genrequest){
|
|
warning(0, "genericbootp: %I", iip->ipaddr);
|
|
memmove(bp->optmagic, genericopt, 4);
|
|
miscoptions(rp, iip->ipaddr);
|
|
termopt(rp);
|
|
} else if(iip->vendor[0] != 0) {
|
|
warning(0, "bootp vendor field: %s", iip->vendor);
|
|
memset(rp->p, 0, 128-4);
|
|
rp->p += sprint((char*)bp->optmagic, "%s", iip->vendor);
|
|
} else {
|
|
memset(rp->p, 0, 128-4);
|
|
rp->p += 128-4;
|
|
}
|
|
|
|
/*
|
|
* set destination
|
|
*/
|
|
flags = nhgets(bp->flags);
|
|
if(validip(rp->giaddr)){
|
|
ipmove(up->raddr, rp->giaddr);
|
|
hnputs(up->rport, 67);
|
|
} else if(flags & Fbroadcast){
|
|
ipmove(up->raddr, IPv4bcast);
|
|
hnputs(up->rport, 68);
|
|
} else {
|
|
v4tov6(up->raddr, bp->yiaddr);
|
|
if(bp->htype == 1)
|
|
arpenter(up->raddr, bp->chaddr);
|
|
hnputs(up->rport, 68);
|
|
}
|
|
|
|
/*
|
|
* select best local address if destination is directly connected
|
|
*/
|
|
lifc = findlifc(up->raddr);
|
|
if(lifc)
|
|
ipmove(up->laddr, lifc->ip);
|
|
|
|
/*
|
|
* our identity
|
|
*/
|
|
strncpy(bp->sname, mysysname, sizeof(bp->sname));
|
|
|
|
/*
|
|
* set tftp server
|
|
*/
|
|
setsiaddr(bp->siaddr, iip->tftp, up->laddr);
|
|
if(rp->genrequest && *iip->bootf2)
|
|
setsiaddr(bp->siaddr, iip->tftp2, up->laddr);
|
|
|
|
/*
|
|
* RFC 1048 says that we must pad vendor field with
|
|
* zeros until we have a 64 byte field.
|
|
*/
|
|
n = rp->p - rp->bp->optdata;
|
|
if(n < 64-4) {
|
|
memset(rp->p, 0, (64-4)-n);
|
|
rp->p += (64-4)-n;
|
|
}
|
|
|
|
/*
|
|
* send
|
|
*/
|
|
n = rp->p - rp->buf;
|
|
if(!ismuted(rp) && jehanne_write(rp->fd, rp->buf, n) != n)
|
|
warning(0, "bootp: write failed: %r");
|
|
|
|
warning(0, "bootp via %I: file %s xid(%ux)flag(%ux)ci(%V)gi(%V)yi(%V)si(%V) %s",
|
|
up->raddr, bp->file, nhgetl(bp->xid), nhgets(bp->flags),
|
|
bp->ciaddr, bp->giaddr, bp->yiaddr, bp->siaddr,
|
|
optbuf);
|
|
}
|
|
|
|
void
|
|
parseoptions(Req *rp)
|
|
{
|
|
int n, c, code;
|
|
uint8_t *o, *p;
|
|
|
|
p = rp->p;
|
|
|
|
while(p < rp->e){
|
|
code = *p++;
|
|
if(code == 255)
|
|
break;
|
|
if(code == 0)
|
|
continue;
|
|
|
|
/* ignore anything that's too long */
|
|
n = *p++;
|
|
o = p;
|
|
p += n;
|
|
if(p > rp->e)
|
|
return;
|
|
|
|
switch(code){
|
|
case ODipaddr: /* requested ip address */
|
|
if(n == IPv4addrlen)
|
|
v4tov6(rp->ip, o);
|
|
break;
|
|
case ODlease: /* requested lease time */
|
|
rp->leasetime = nhgetl(o);
|
|
if(rp->leasetime > MaxLease || rp->leasetime < 0)
|
|
rp->leasetime = MaxLease;
|
|
break;
|
|
case ODtype:
|
|
c = *o;
|
|
if(c < 10 && c > 0)
|
|
rp->dhcptype = c;
|
|
break;
|
|
case ODserverid:
|
|
if(n == IPv4addrlen)
|
|
v4tov6(rp->server, o);
|
|
break;
|
|
case ODmessage:
|
|
if(n > sizeof rp->msg-1)
|
|
n = sizeof rp->msg-1;
|
|
memmove(rp->msg, o, n);
|
|
rp->msg[n] = 0;
|
|
break;
|
|
case ODmaxmsg:
|
|
c = nhgets(o);
|
|
c -= 28;
|
|
c += Udphdrsize;
|
|
if(c > 0)
|
|
rp->max = rp->buf + c;
|
|
break;
|
|
case ODclientid:
|
|
if(n <= 1)
|
|
break;
|
|
rp->id = toid( o, n);
|
|
break;
|
|
case ODparams:
|
|
if(n > sizeof(rp->requested))
|
|
n = sizeof(rp->requested);
|
|
memmove(rp->requested, o, n);
|
|
break;
|
|
case ODvendorclass:
|
|
if(n >= sizeof(rp->vendorclass))
|
|
n = sizeof(rp->vendorclass)-1;
|
|
memmove(rp->vendorclass, o, n);
|
|
rp->vendorclass[n] = 0;
|
|
if(strncmp((char*)rp->vendorclass, "p9-", 3) == 0)
|
|
strcpy(rp->cputype, (char*)rp->vendorclass+3);
|
|
break;
|
|
case OBend:
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
remrequested(Req *rp, int opt)
|
|
{
|
|
uint8_t *p;
|
|
|
|
p = memchr(rp->requested, opt, sizeof(rp->requested));
|
|
if(p != nil)
|
|
*p = OBpad;
|
|
}
|
|
|
|
void
|
|
miscoptions(Req *rp, uint8_t *ip)
|
|
{
|
|
int i, j, na;
|
|
uint8_t x[2*IPaddrlen], vopts[Maxoptlen];
|
|
uint8_t *op, *omax;
|
|
uint8_t *addrs[2];
|
|
char *p;
|
|
char *attr[100], **a;
|
|
Ndbtuple *t;
|
|
|
|
addrs[0] = x;
|
|
addrs[1] = x+IPaddrlen;
|
|
|
|
/* always supply these */
|
|
maskopt(rp, OBmask, rp->gii.ipmask);
|
|
if(validip(rp->gii.gwip)){
|
|
remrequested(rp, OBrouter);
|
|
addropt(rp, OBrouter, rp->gii.gwip);
|
|
} else if(validip(rp->giaddr)){
|
|
remrequested(rp, OBrouter);
|
|
addropt(rp, OBrouter, rp->giaddr);
|
|
}
|
|
|
|
/*
|
|
* OBhostname for the HP4000M switches
|
|
* (this causes NT to log infinite errors - tough shit)
|
|
*/
|
|
if(*rp->ii.domain){
|
|
remrequested(rp, OBhostname);
|
|
stringopt(rp, OBhostname, rp->ii.domain);
|
|
}
|
|
if(*rp->ii.rootpath)
|
|
stringopt(rp, OBrootpath, rp->ii.rootpath);
|
|
|
|
/* figure out what we need to lookup */
|
|
na = 0;
|
|
a = attr;
|
|
if(*rp->ii.domain == 0)
|
|
a[na++] = "dom";
|
|
for(i = 0; i < sizeof(rp->requested); i++)
|
|
switch(rp->requested[i]){
|
|
case OBrouter:
|
|
a[na++] = "@ipgw";
|
|
break;
|
|
case OBdnserver:
|
|
a[na++] = "@dns";
|
|
break;
|
|
case OBnetbiosns:
|
|
a[na++] = "@wins";
|
|
break;
|
|
case OBsmtpserver:
|
|
a[na++] = "@smtp";
|
|
break;
|
|
case OBpop3server:
|
|
a[na++] = "@pop3";
|
|
break;
|
|
case OBwwwserver:
|
|
a[na++] = "@www";
|
|
break;
|
|
case OBntpserver:
|
|
a[na++] = "@ntp";
|
|
break;
|
|
case OBtimeserver:
|
|
a[na++] = "@time";
|
|
break;
|
|
}
|
|
if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
|
|
|| strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
|
|
a[na++] = "@fs";
|
|
a[na++] = "@auth";
|
|
}
|
|
t = lookupinfo(ip, a, na);
|
|
|
|
/* lookup anything we might be missing */
|
|
if(*rp->ii.domain == 0)
|
|
lookupname(rp->ii.domain, t);
|
|
|
|
/* add any requested ones that we know about */
|
|
for(i = 0; i < sizeof(rp->requested); i++)
|
|
switch(rp->requested[i]){
|
|
case OBrouter:
|
|
j = lookupserver("ipgw", addrs, t);
|
|
addrsopt(rp, OBrouter, addrs, j);
|
|
break;
|
|
case OBdnserver:
|
|
j = lookupserver("dns", addrs, t);
|
|
addrsopt(rp, OBdnserver, addrs, j);
|
|
break;
|
|
case OBhostname:
|
|
if(*rp->ii.domain)
|
|
stringopt(rp, OBhostname, rp->ii.domain);
|
|
break;
|
|
case OBdomainname:
|
|
p = strchr(rp->ii.domain, '.');
|
|
if(p)
|
|
stringopt(rp, OBdomainname, p+1);
|
|
break;
|
|
case OBnetbiosns:
|
|
j = lookupserver("wins", addrs, t);
|
|
addrsopt(rp, OBnetbiosns, addrs, j);
|
|
break;
|
|
case OBnetbiostype:
|
|
/* p-node: peer to peer WINS queries */
|
|
byteopt(rp, OBnetbiostype, 0x2);
|
|
break;
|
|
case OBsmtpserver:
|
|
j = lookupserver("smtp", addrs, t);
|
|
addrsopt(rp, OBsmtpserver, addrs, j);
|
|
break;
|
|
case OBpop3server:
|
|
j = lookupserver("pop3", addrs, t);
|
|
addrsopt(rp, OBpop3server, addrs, j);
|
|
break;
|
|
case OBwwwserver:
|
|
j = lookupserver("www", addrs, t);
|
|
addrsopt(rp, OBwwwserver, addrs, j);
|
|
break;
|
|
case OBntpserver:
|
|
j = lookupserver("ntp", addrs, t);
|
|
addrsopt(rp, OBntpserver, addrs, j);
|
|
break;
|
|
case OBtimeserver:
|
|
j = lookupserver("time", addrs, t);
|
|
addrsopt(rp, OBtimeserver, addrs, j);
|
|
break;
|
|
case OBttl:
|
|
byteopt(rp, OBttl, 255);
|
|
break;
|
|
}
|
|
|
|
/* add plan9 specific options */
|
|
if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
|
|
|| strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
|
|
/* point to temporary area */
|
|
op = rp->p;
|
|
omax = rp->max;
|
|
/* stash encoded options in vopts */
|
|
rp->p = vopts;
|
|
rp->max = vopts + sizeof(vopts) - 1;
|
|
|
|
/* emit old v4 addresses first to make sure that they fit */
|
|
addrsopt(rp, OP9fsv4, addrs, lookupserver("fs", addrs, t));
|
|
addrsopt(rp, OP9authv4, addrs, lookupserver("auth", addrs, t));
|
|
|
|
p9addrsopt(rp, OP9fs, addrs, lookupserver("fs", addrs, t));
|
|
p9addrsopt(rp, OP9auth, addrs, lookupserver("auth", addrs, t));
|
|
p9addrsopt(rp, OP9ipaddr, addrs, lookupserver("ip", addrs, t));
|
|
p9addrsopt(rp, OP9ipmask, addrs, lookupserver("ipmask", addrs, t));
|
|
p9addrsopt(rp, OP9ipgw, addrs, lookupserver("ipgw", addrs, t));
|
|
|
|
/* point back to packet, encapsulate vopts into packet */
|
|
j = rp->p - vopts;
|
|
rp->p = op;
|
|
rp->max = omax;
|
|
vectoropt(rp, OBvendorinfo, vopts, j);
|
|
}
|
|
|
|
ndbfree(t);
|
|
}
|
|
|
|
int
|
|
openlisten(char *net)
|
|
{
|
|
int fd, cfd;
|
|
char data[128], devdir[40];
|
|
|
|
sprint(data, "%s/udp!*!bootp", net);
|
|
cfd = announce(data, devdir);
|
|
if(cfd < 0)
|
|
fatal(1, "can't announce");
|
|
if(fprint(cfd, "headers") < 0)
|
|
fatal(1, "can't set header mode");
|
|
|
|
sprint(data, "%s/data", devdir);
|
|
fd = sys_open(data, ORDWR);
|
|
if(fd < 0)
|
|
fatal(1, "open udp data");
|
|
return fd;
|
|
}
|
|
|
|
void
|
|
fatal(int syserr, char *fmt, ...)
|
|
{
|
|
char buf[Maxloglen];
|
|
va_list arg;
|
|
|
|
va_start(arg, fmt);
|
|
vseprint(buf, buf+sizeof(buf), fmt, arg);
|
|
va_end(arg);
|
|
if(syserr)
|
|
syslog(1, blog, "%s: %r", buf);
|
|
else
|
|
syslog(1, blog, "%s", buf);
|
|
exits(buf);
|
|
}
|
|
|
|
void
|
|
warning(int syserr, char *fmt, ...)
|
|
{
|
|
char buf[Maxloglen];
|
|
va_list arg;
|
|
|
|
va_start(arg, fmt);
|
|
vseprint(buf, buf+sizeof(buf), fmt, arg);
|
|
va_end(arg);
|
|
if(syserr){
|
|
syslog(0, blog, "%s: %r", buf);
|
|
if(debug)
|
|
fprint(2, "%s: %r\n", buf);
|
|
} else {
|
|
syslog(0, blog, "%s", buf);
|
|
if(debug)
|
|
fprint(2, "%s\n", buf);
|
|
}
|
|
}
|
|
|
|
char*
|
|
readsysname(void)
|
|
{
|
|
static char name[128];
|
|
char *p;
|
|
int n, fd;
|
|
|
|
fd = sys_open("/dev/sysname", OREAD);
|
|
if(fd >= 0){
|
|
n = jehanne_read(fd, name, sizeof(name)-1);
|
|
sys_close(fd);
|
|
if(n > 0){
|
|
name[n] = 0;
|
|
return name;
|
|
}
|
|
}
|
|
p = getenv(ENV_SYSNAME);
|
|
if(p == nil || *p == 0)
|
|
return "unknown";
|
|
return p;
|
|
}
|
|
|
|
extern int
|
|
validip(uint8_t *ip)
|
|
{
|
|
if(ipcmp(ip, IPnoaddr) == 0)
|
|
return 0;
|
|
if(ipcmp(ip, v4prefix) == 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
void
|
|
longopt(Req *rp, int t, int32_t v)
|
|
{
|
|
if(rp->p + 6 > rp->max)
|
|
return;
|
|
*rp->p++ = t;
|
|
*rp->p++ = 4;
|
|
hnputl(rp->p, v);
|
|
rp->p += 4;
|
|
|
|
op = seprint(op, oe, "%s(%ld)", optname[t], v);
|
|
}
|
|
|
|
void
|
|
addropt(Req *rp, int t, uint8_t *ip)
|
|
{
|
|
if(rp->p + 6 > rp->max)
|
|
return;
|
|
if (!isv4(ip)) {
|
|
if (debug)
|
|
warning(0, "not a v4 %s server: %I", optname[t], ip);
|
|
return;
|
|
}
|
|
*rp->p++ = t;
|
|
*rp->p++ = 4;
|
|
memmove(rp->p, ip+IPv4off, 4);
|
|
rp->p += 4;
|
|
|
|
op = seprint(op, oe, "%s(%I)", optname[t], ip);
|
|
}
|
|
|
|
void
|
|
maskopt(Req *rp, int t, uint8_t *ip)
|
|
{
|
|
if(rp->p + 6 > rp->max)
|
|
return;
|
|
*rp->p++ = t;
|
|
*rp->p++ = 4;
|
|
memmove(rp->p, ip+IPv4off, 4);
|
|
rp->p += 4;
|
|
|
|
op = seprint(op, oe, "%s(%M)", optname[t], ip);
|
|
}
|
|
|
|
void
|
|
addrsopt(Req *rp, int t, uint8_t **ip, int i)
|
|
{
|
|
int v4s, n;
|
|
|
|
if(i <= 0)
|
|
return;
|
|
if(rp->p + 2 + 4*i > rp->max)
|
|
return;
|
|
v4s = 0;
|
|
for(n = i; n-- > 0; )
|
|
if (isv4(ip[n]))
|
|
v4s++;
|
|
if (v4s <= 0) {
|
|
if (debug)
|
|
warning(0, "no v4 %s servers", optname[t]);
|
|
return;
|
|
}
|
|
*rp->p++ = t;
|
|
*rp->p++ = 4*v4s;
|
|
op = seprint(op, oe, " %s(", optname[t]);
|
|
while(i-- > 0){
|
|
if (!isv4(*ip)) {
|
|
op = seprint(op, oe, " skipping %I ", *ip);
|
|
continue;
|
|
}
|
|
v6tov4(rp->p, *ip);
|
|
rp->p += 4;
|
|
op = seprint(op, oe, "%I", *ip);
|
|
ip++;
|
|
if(i > 0)
|
|
op = seprint(op, oe, " ");
|
|
}
|
|
op = seprint(op, oe, ")");
|
|
}
|
|
|
|
void
|
|
p9addrsopt(Req *rp, int t, uint8_t **ip, int i)
|
|
{
|
|
char *pkt, *payload;
|
|
|
|
if(i <= 0 || !v6opts)
|
|
return;
|
|
pkt = (char *)rp->p;
|
|
*pkt++ = t; /* option */
|
|
pkt++; /* fill in payload length below */
|
|
payload = pkt;
|
|
*pkt++ = i; /* plan 9 address count */
|
|
op = seprint(op, oe, " %s(", optname[t]);
|
|
while(i-- > 0){
|
|
pkt = seprint(pkt, (char *)rp->max, "%I", *ip);
|
|
if ((uint8_t *)pkt+1 >= rp->max) {
|
|
op = seprint(op, oe, "<out of mem1>)");
|
|
return;
|
|
}
|
|
pkt++; /* leave NUL as terminator */
|
|
op = seprint(op, oe, "%I", *ip);
|
|
ip++;
|
|
if(i > 0)
|
|
op = seprint(op, oe, " ");
|
|
}
|
|
if ((uint8_t *)pkt - rp->p > 0377) {
|
|
op = seprint(op, oe, "<out of mem2>)");
|
|
return;
|
|
}
|
|
op = seprint(op, oe, ")");
|
|
rp->p[1] = pkt - payload; /* payload length */
|
|
rp->p = (uint8_t *)pkt;
|
|
}
|
|
|
|
void
|
|
byteopt(Req *rp, int t, uint8_t v)
|
|
{
|
|
if(rp->p + 3 > rp->max)
|
|
return;
|
|
*rp->p++ = t;
|
|
*rp->p++ = 1;
|
|
*rp->p++ = v;
|
|
|
|
op = seprint(op, oe, "%s(%d)", optname[t], v);
|
|
}
|
|
|
|
void
|
|
termopt(Req *rp)
|
|
{
|
|
if(rp->p + 1 > rp->max)
|
|
return;
|
|
*rp->p++ = OBend;
|
|
}
|
|
|
|
void
|
|
stringopt(Req *rp, int t, char *str)
|
|
{
|
|
int n;
|
|
|
|
n = strlen(str);
|
|
if(n > 255)
|
|
n = 255;
|
|
if(rp->p+n+2 > rp->max)
|
|
return;
|
|
*rp->p++ = t;
|
|
*rp->p++ = n;
|
|
memmove(rp->p, str, n);
|
|
rp->p += n;
|
|
|
|
op = seprint(op, oe, "%s(%s)", optname[t], str);
|
|
}
|
|
|
|
void
|
|
vectoropt(Req *rp, int t, uint8_t *v, int n)
|
|
{
|
|
int i;
|
|
|
|
if(n > 255) {
|
|
n = 255;
|
|
op = seprint(op, oe, "vectoropt len %d > 255 ", n);
|
|
}
|
|
if(rp->p+n+2 > rp->max)
|
|
return;
|
|
*rp->p++ = t;
|
|
*rp->p++ = n;
|
|
memmove(rp->p, v, n);
|
|
rp->p += n;
|
|
|
|
op = seprint(op, oe, "%s(", optname[t]);
|
|
if(n > 0)
|
|
op = seprint(op, oe, "%ud", v[0]);
|
|
for(i = 1; i < n; i++)
|
|
op = seprint(op, oe, " %ud", v[i]);
|
|
op = seprint(op, oe, ")");
|
|
}
|
|
|
|
int
|
|
fromhex(int x)
|
|
{
|
|
if(x >= '0' && x <= '9')
|
|
return x - '0';
|
|
return x - 'a';
|
|
}
|
|
|
|
void
|
|
hexopt(Req *rp, int t, char *str)
|
|
{
|
|
int n;
|
|
|
|
n = strlen(str);
|
|
n /= 2;
|
|
if(n > 255)
|
|
n = 255;
|
|
if(rp->p+n+2 > rp->max)
|
|
return;
|
|
*rp->p++ = t;
|
|
*rp->p++ = n;
|
|
while(n-- > 0){
|
|
*rp->p++ = (fromhex(str[0])<<4)|fromhex(str[1]);
|
|
str += 2;
|
|
}
|
|
|
|
op = seprint(op, oe, "%s(%s)", optname[t], str);
|
|
}
|
|
|
|
void
|
|
arpenter(uint8_t *ip, uint8_t *ether)
|
|
{
|
|
int f;
|
|
char buf[256];
|
|
|
|
sprint(buf, "%s/arp", net);
|
|
f = sys_open(buf, OWRITE);
|
|
if(f < 0){
|
|
syslog(debug, blog, "open %s: %r", buf);
|
|
return;
|
|
}
|
|
fprint(f, "add ether %I %E", ip, ether);
|
|
sys_close(f);
|
|
}
|
|
|
|
char *dhcpmsgname[] =
|
|
{
|
|
[Discover] "Discover",
|
|
[Offer] "Offer",
|
|
[Request] "Request",
|
|
[Decline] "Decline",
|
|
[Ack] "Ack",
|
|
[Nak] "Nak",
|
|
[Release] "Release",
|
|
[Inform] "Inform",
|
|
};
|
|
|
|
void
|
|
logdhcp(Req *rp)
|
|
{
|
|
char buf[4096];
|
|
char *p, *e;
|
|
int i;
|
|
|
|
p = buf;
|
|
e = buf + sizeof(buf);
|
|
if(rp->dhcptype > 0 && rp->dhcptype <= Inform)
|
|
p = seprint(p, e, "%s(", dhcpmsgname[rp->dhcptype]);
|
|
else
|
|
p = seprint(p, e, "%d(", rp->dhcptype);
|
|
p = seprint(p, e, "%I->%I) xid(%ux)flag(%ux)", rp->up->raddr, rp->up->laddr,
|
|
nhgetl(rp->bp->xid), nhgets(rp->bp->flags));
|
|
if(rp->bp->htype == 1)
|
|
p = seprint(p, e, "ea(%E)", rp->bp->chaddr);
|
|
if(validip(rp->ciaddr))
|
|
p = seprint(p, e, "ci(%I)", rp->ciaddr);
|
|
if(validip(rp->giaddr))
|
|
p = seprint(p, e, "gi(%I)", rp->giaddr);
|
|
if(validip(rp->ip))
|
|
p = seprint(p, e, "ip(%I)", rp->ip);
|
|
if(rp->id != nil)
|
|
p = seprint(p, e, "id(%s)", rp->id);
|
|
if(rp->leasetime)
|
|
p = seprint(p, e, "leas(%d)", rp->leasetime);
|
|
if(validip(rp->server))
|
|
p = seprint(p, e, "sid(%I)", rp->server);
|
|
p = seprint(p, e, "need(");
|
|
for(i = 0; i < sizeof(rp->requested); i++)
|
|
if(rp->requested[i] != 0)
|
|
p = seprint(p, e, "%s ", optname[rp->requested[i]]);
|
|
p = seprint(p, e, ")");
|
|
|
|
USED(p);
|
|
syslog(0, blog, "%s", buf);
|
|
}
|
|
|
|
void
|
|
logdhcpout(Req *rp, char *type)
|
|
{
|
|
syslog(0, blog, "%s(%I-%I)id(%s)ci(%V)gi(%V)yi(%V)si(%V) %s",
|
|
type, rp->up->laddr, rp->up->raddr, rp->id,
|
|
rp->bp->ciaddr, rp->bp->giaddr, rp->bp->yiaddr, rp->bp->siaddr, optbuf);
|
|
}
|
|
|
|
/*
|
|
* if we get behind, it's useless to try answering since the sender
|
|
* will probably have retransmitted with a differnt sequence number.
|
|
* So dump all but the last message in the queue.
|
|
*/
|
|
void
|
|
ding(void* _, char *msg)
|
|
{
|
|
if(strstr(msg, "alarm"))
|
|
sys_noted(NCONT);
|
|
else
|
|
sys_noted(NDFLT);
|
|
}
|
|
|
|
int
|
|
readlast(int fd, uint8_t *buf, int len)
|
|
{
|
|
int lastn, n;
|
|
|
|
sys_notify(ding);
|
|
|
|
lastn = 0;
|
|
for(;;){
|
|
sys_alarm(20);
|
|
n = jehanne_read(fd, buf, len);
|
|
sys_alarm(0);
|
|
if(n < 0){
|
|
if(lastn > 0)
|
|
return lastn;
|
|
break;
|
|
}
|
|
lastn = n;
|
|
}
|
|
return jehanne_read(fd, buf, len);
|
|
}
|