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489 lines
9.8 KiB
489 lines
9.8 KiB
/*
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* cbcp - Call Back Configuration Protocol.
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*
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* Copyright (c) 1995 Pedro Roque Marques. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The names of the authors of this software must not be used to
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* endorse or promote products derived from this software without
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* prior written permission.
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*
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* 4. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by Pedro Roque Marques
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* <pedro_m@yahoo.com>"
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*
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* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
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* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
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* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#define RCSID "$Id: cbcp.c,v 1.17 2006/05/22 00:04:07 paulus Exp $"
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include "pppd.h"
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#include "cbcp.h"
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#include "fsm.h"
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#include "lcp.h"
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static const char rcsid[] = RCSID;
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/*
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* Options.
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*/
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static int setcbcp __P((char **));
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static option_t cbcp_option_list[] = {
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{ "callback", o_special, (void *)setcbcp,
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"Ask for callback", OPT_PRIO | OPT_A2STRVAL, &cbcp[0].us_number },
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{ NULL }
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};
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/*
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* Protocol entry points.
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*/
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static void cbcp_init __P((int unit));
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static void cbcp_open __P((int unit));
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static void cbcp_lowerup __P((int unit));
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static void cbcp_input __P((int unit, u_char *pkt, int len));
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static void cbcp_protrej __P((int unit));
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static int cbcp_printpkt __P((u_char *pkt, int len,
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void (*printer) __P((void *, char *, ...)),
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void *arg));
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struct protent cbcp_protent = {
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PPP_CBCP,
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cbcp_init,
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cbcp_input,
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cbcp_protrej,
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cbcp_lowerup,
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NULL,
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cbcp_open,
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NULL,
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cbcp_printpkt,
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NULL,
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0,
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"CBCP",
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NULL,
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cbcp_option_list,
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NULL,
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NULL,
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NULL
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};
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cbcp_state cbcp[NUM_PPP];
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/* internal prototypes */
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static void cbcp_recvreq __P((cbcp_state *us, u_char *pckt, int len));
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static void cbcp_resp __P((cbcp_state *us));
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static void cbcp_up __P((cbcp_state *us));
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static void cbcp_recvack __P((cbcp_state *us, u_char *pckt, int len));
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static void cbcp_send __P((cbcp_state *us, int code, u_char *buf, int len));
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/* option processing */
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static int
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setcbcp(argv)
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char **argv;
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{
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lcp_wantoptions[0].neg_cbcp = 1;
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cbcp_protent.enabled_flag = 1;
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cbcp[0].us_number = strdup(*argv);
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if (cbcp[0].us_number == 0)
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novm("callback number");
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cbcp[0].us_type |= (1 << CB_CONF_USER);
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cbcp[0].us_type |= (1 << CB_CONF_ADMIN);
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return (1);
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}
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/* init state */
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static void
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cbcp_init(iface)
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int iface;
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{
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cbcp_state *us;
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us = &cbcp[iface];
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memset(us, 0, sizeof(cbcp_state));
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us->us_unit = iface;
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us->us_type |= (1 << CB_CONF_NO);
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}
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/* lower layer is up */
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static void
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cbcp_lowerup(iface)
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int iface;
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{
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cbcp_state *us = &cbcp[iface];
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dbglog("cbcp_lowerup");
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dbglog("want: %d", us->us_type);
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if (us->us_type == CB_CONF_USER)
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dbglog("phone no: %s", us->us_number);
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}
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static void
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cbcp_open(unit)
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int unit;
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{
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dbglog("cbcp_open");
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}
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/* process an incomming packet */
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static void
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cbcp_input(unit, inpacket, pktlen)
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int unit;
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u_char *inpacket;
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int pktlen;
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{
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u_char *inp;
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u_char code, id;
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u_short len;
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cbcp_state *us = &cbcp[unit];
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inp = inpacket;
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if (pktlen < CBCP_MINLEN) {
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if (debug)
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dbglog("CBCP packet is too small");
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return;
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}
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GETCHAR(code, inp);
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GETCHAR(id, inp);
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GETSHORT(len, inp);
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if (len > pktlen || len < CBCP_MINLEN) {
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if (debug)
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dbglog("CBCP packet: invalid length %d", len);
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return;
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}
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len -= CBCP_MINLEN;
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switch(code) {
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case CBCP_REQ:
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us->us_id = id;
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cbcp_recvreq(us, inp, len);
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break;
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case CBCP_RESP:
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if (debug)
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dbglog("CBCP_RESP received");
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break;
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case CBCP_ACK:
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if (debug && id != us->us_id)
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dbglog("id doesn't match: expected %d recv %d",
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us->us_id, id);
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cbcp_recvack(us, inp, len);
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break;
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default:
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break;
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}
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}
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/* protocol was rejected by foe */
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void cbcp_protrej(int iface)
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{
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}
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char *cbcp_codenames[] = {
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"Request", "Response", "Ack"
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};
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char *cbcp_optionnames[] = {
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"NoCallback",
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"UserDefined",
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"AdminDefined",
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"List"
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};
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/* pretty print a packet */
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static int
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cbcp_printpkt(p, plen, printer, arg)
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u_char *p;
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int plen;
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void (*printer) __P((void *, char *, ...));
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void *arg;
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{
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int code, opt, id, len, olen, delay;
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u_char *pstart;
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if (plen < HEADERLEN)
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return 0;
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pstart = p;
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GETCHAR(code, p);
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GETCHAR(id, p);
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GETSHORT(len, p);
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if (len < HEADERLEN || len > plen)
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return 0;
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if (code >= 1 && code <= sizeof(cbcp_codenames) / sizeof(char *))
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printer(arg, " %s", cbcp_codenames[code-1]);
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else
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printer(arg, " code=0x%x", code);
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printer(arg, " id=0x%x", id);
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len -= HEADERLEN;
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switch (code) {
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case CBCP_REQ:
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case CBCP_RESP:
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case CBCP_ACK:
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while(len >= 2) {
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GETCHAR(opt, p);
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GETCHAR(olen, p);
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if (olen < 2 || olen > len) {
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break;
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}
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printer(arg, " <");
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len -= olen;
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if (opt >= 1 && opt <= sizeof(cbcp_optionnames) / sizeof(char *))
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printer(arg, " %s", cbcp_optionnames[opt-1]);
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else
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printer(arg, " option=0x%x", opt);
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if (olen > 2) {
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GETCHAR(delay, p);
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printer(arg, " delay = %d", delay);
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}
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if (olen > 3) {
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int addrt;
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char str[256];
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GETCHAR(addrt, p);
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memcpy(str, p, olen - 4);
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str[olen - 4] = 0;
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printer(arg, " number = %s", str);
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}
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printer(arg, ">");
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}
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break;
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default:
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break;
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}
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for (; len > 0; --len) {
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GETCHAR(code, p);
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printer(arg, " %.2x", code);
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}
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return p - pstart;
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}
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/* received CBCP request */
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static void
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cbcp_recvreq(us, pckt, pcktlen)
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cbcp_state *us;
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u_char *pckt;
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int pcktlen;
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{
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u_char type, opt_len, delay, addr_type;
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char address[256];
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int len = pcktlen;
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address[0] = 0;
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while (len >= 2) {
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dbglog("length: %d", len);
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GETCHAR(type, pckt);
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GETCHAR(opt_len, pckt);
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if (opt_len < 2 || opt_len > len)
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break;
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if (opt_len > 2)
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GETCHAR(delay, pckt);
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us->us_allowed |= (1 << type);
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switch(type) {
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case CB_CONF_NO:
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dbglog("no callback allowed");
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break;
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case CB_CONF_USER:
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dbglog("user callback allowed");
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if (opt_len > 4) {
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GETCHAR(addr_type, pckt);
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memcpy(address, pckt, opt_len - 4);
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address[opt_len - 4] = 0;
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if (address[0])
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dbglog("address: %s", address);
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}
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break;
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case CB_CONF_ADMIN:
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dbglog("user admin defined allowed");
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break;
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case CB_CONF_LIST:
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break;
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}
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len -= opt_len;
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}
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if (len != 0) {
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if (debug)
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dbglog("cbcp_recvreq: malformed packet (%d bytes left)", len);
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return;
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}
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cbcp_resp(us);
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}
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static void
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cbcp_resp(us)
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cbcp_state *us;
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{
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u_char cb_type;
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u_char buf[256];
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u_char *bufp = buf;
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int len = 0;
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int slen;
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cb_type = us->us_allowed & us->us_type;
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dbglog("cbcp_resp cb_type=%d", cb_type);
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#if 0
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if (!cb_type)
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lcp_down(us->us_unit);
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#endif
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if (cb_type & ( 1 << CB_CONF_USER ) ) {
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dbglog("cbcp_resp CONF_USER");
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slen = strlen(us->us_number);
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if (slen > 250) {
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warn("callback number truncated to 250 characters");
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slen = 250;
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}
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PUTCHAR(CB_CONF_USER, bufp);
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len = 3 + 1 + slen + 1;
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PUTCHAR(len , bufp);
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PUTCHAR(5, bufp); /* delay */
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PUTCHAR(1, bufp);
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BCOPY(us->us_number, bufp, slen + 1);
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cbcp_send(us, CBCP_RESP, buf, len);
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return;
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}
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if (cb_type & ( 1 << CB_CONF_ADMIN ) ) {
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dbglog("cbcp_resp CONF_ADMIN");
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PUTCHAR(CB_CONF_ADMIN, bufp);
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len = 3;
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PUTCHAR(len, bufp);
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PUTCHAR(5, bufp); /* delay */
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cbcp_send(us, CBCP_RESP, buf, len);
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return;
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}
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if (cb_type & ( 1 << CB_CONF_NO ) ) {
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dbglog("cbcp_resp CONF_NO");
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PUTCHAR(CB_CONF_NO, bufp);
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len = 2;
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PUTCHAR(len , bufp);
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cbcp_send(us, CBCP_RESP, buf, len);
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start_networks(us->us_unit);
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return;
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}
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}
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static void
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cbcp_send(us, code, buf, len)
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cbcp_state *us;
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int code;
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u_char *buf;
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int len;
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{
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u_char *outp;
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int outlen;
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outp = outpacket_buf;
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outlen = 4 + len;
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MAKEHEADER(outp, PPP_CBCP);
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PUTCHAR(code, outp);
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PUTCHAR(us->us_id, outp);
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PUTSHORT(outlen, outp);
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if (len)
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BCOPY(buf, outp, len);
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output(us->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
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}
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static void
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cbcp_recvack(us, pckt, len)
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cbcp_state *us;
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u_char *pckt;
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int len;
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{
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u_char type, delay, addr_type;
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int opt_len;
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char address[256];
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if (len >= 2) {
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GETCHAR(type, pckt);
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GETCHAR(opt_len, pckt);
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if (opt_len >= 2 && opt_len <= len) {
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if (opt_len > 2)
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GETCHAR(delay, pckt);
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if (opt_len > 4) {
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GETCHAR(addr_type, pckt);
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memcpy(address, pckt, opt_len - 4);
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address[opt_len - 4] = 0;
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if (address[0])
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dbglog("peer will call: %s", address);
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}
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if (type == CB_CONF_NO)
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return;
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cbcp_up(us);
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} else if (debug)
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dbglog("cbcp_recvack: malformed packet");
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}
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}
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/* ok peer will do callback */
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static void
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cbcp_up(us)
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cbcp_state *us;
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{
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persist = 0;
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status = EXIT_CALLBACK;
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lcp_close(0, "Call me back, please");
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}
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