2 * cbcp - Call Back Configuration Protocol.
4 * Copyright (c) 1995 Pedro Roque Marques. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The names of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
22 * 4. Redistributions of any form whatsoever must retain the following
24 * "This product includes software developed by Pedro Roque Marques
25 * <pedro_m@yahoo.com>"
27 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
28 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
29 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
30 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
31 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
32 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
33 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
36 #define RCSID "$Id: cbcp.c,v 1.16 2004/10/28 00:15:36 paulus Exp $"
40 #include <sys/types.h>
48 static const char rcsid[] = RCSID;
53 static int setcbcp __P((char **));
55 static option_t cbcp_option_list[] = {
56 { "callback", o_special, (void *)setcbcp,
57 "Ask for callback", OPT_PRIO | OPT_A2STRVAL, &cbcp[0].us_number },
62 * Protocol entry points.
64 static void cbcp_init __P((int unit));
65 static void cbcp_open __P((int unit));
66 static void cbcp_lowerup __P((int unit));
67 static void cbcp_input __P((int unit, u_char *pkt, int len));
68 static void cbcp_protrej __P((int unit));
69 static int cbcp_printpkt __P((u_char *pkt, int len,
70 void (*printer) __P((void *, char *, ...)),
73 struct protent cbcp_protent = {
93 cbcp_state cbcp[NUM_PPP];
95 /* internal prototypes */
97 static void cbcp_recvreq __P((cbcp_state *us, u_char *pckt, int len));
98 static void cbcp_resp __P((cbcp_state *us));
99 static void cbcp_up __P((cbcp_state *us));
100 static void cbcp_recvack __P((cbcp_state *us, u_char *pckt, int len));
101 static void cbcp_send __P((cbcp_state *us, int code, u_char *buf, int len));
103 /* option processing */
108 lcp_wantoptions[0].neg_cbcp = 1;
109 cbcp_protent.enabled_flag = 1;
110 cbcp[0].us_number = strdup(*argv);
111 if (cbcp[0].us_number == 0)
112 novm("callback number");
113 cbcp[0].us_type |= (1 << CB_CONF_USER);
114 cbcp[0].us_type |= (1 << CB_CONF_ADMIN);
126 memset(us, 0, sizeof(cbcp_state));
128 us->us_type |= (1 << CB_CONF_NO);
131 /* lower layer is up */
136 cbcp_state *us = &cbcp[iface];
138 dbglog("cbcp_lowerup");
139 dbglog("want: %d", us->us_type);
141 if (us->us_type == CB_CONF_USER)
142 dbglog("phone no: %s", us->us_number);
152 /* process an incomming packet */
154 cbcp_input(unit, inpacket, pktlen)
163 cbcp_state *us = &cbcp[unit];
167 if (pktlen < CBCP_MINLEN) {
169 dbglog("CBCP packet is too small");
177 if (len > pktlen || len < CBCP_MINLEN) {
179 dbglog("CBCP packet: invalid length %d", len);
188 cbcp_recvreq(us, inp, len);
193 dbglog("CBCP_RESP received");
197 if (debug && id != us->us_id)
198 dbglog("id doesn't match: expected %d recv %d",
201 cbcp_recvack(us, inp, len);
209 /* protocol was rejected by foe */
210 void cbcp_protrej(int iface)
214 char *cbcp_codenames[] = {
215 "Request", "Response", "Ack"
218 char *cbcp_optionnames[] = {
225 /* pretty print a packet */
227 cbcp_printpkt(p, plen, printer, arg)
230 void (*printer) __P((void *, char *, ...));
233 int code, opt, id, len, olen, delay;
236 if (plen < HEADERLEN)
242 if (len < HEADERLEN || len > plen)
245 if (code >= 1 && code <= sizeof(cbcp_codenames) / sizeof(char *))
246 printer(arg, " %s", cbcp_codenames[code-1]);
248 printer(arg, " code=0x%x", code);
250 printer(arg, " id=0x%x", id);
261 if (olen < 2 || olen > len) {
268 if (opt >= 1 && opt <= sizeof(cbcp_optionnames) / sizeof(char *))
269 printer(arg, " %s", cbcp_optionnames[opt-1]);
271 printer(arg, " option=0x%x", opt);
275 printer(arg, " delay = %d", delay);
283 memcpy(str, p, olen - 4);
285 printer(arg, " number = %s", str);
295 for (; len > 0; --len) {
297 printer(arg, " %.2x", code);
303 /* received CBCP request */
305 cbcp_recvreq(us, pckt, pcktlen)
310 u_char type, opt_len, delay, addr_type;
317 dbglog("length: %d", len);
320 GETCHAR(opt_len, pckt);
321 if (opt_len < 2 || opt_len > len)
325 GETCHAR(delay, pckt);
327 us->us_allowed |= (1 << type);
331 dbglog("no callback allowed");
335 dbglog("user callback allowed");
337 GETCHAR(addr_type, pckt);
338 memcpy(address, pckt, opt_len - 4);
339 address[opt_len - 4] = 0;
341 dbglog("address: %s", address);
346 dbglog("user admin defined allowed");
356 dbglog("cbcp_recvreq: malformed packet (%d bytes left)", len);
373 cb_type = us->us_allowed & us->us_type;
374 dbglog("cbcp_resp cb_type=%d", cb_type);
378 lcp_down(us->us_unit);
381 if (cb_type & ( 1 << CB_CONF_USER ) ) {
382 dbglog("cbcp_resp CONF_USER");
383 slen = strlen(us->us_number);
385 warn("callback number truncated to 250 characters");
388 PUTCHAR(CB_CONF_USER, bufp);
389 len = 3 + 1 + slen + 1;
391 PUTCHAR(5, bufp); /* delay */
393 BCOPY(us->us_number, bufp, slen + 1);
394 cbcp_send(us, CBCP_RESP, buf, len);
398 if (cb_type & ( 1 << CB_CONF_ADMIN ) ) {
399 dbglog("cbcp_resp CONF_ADMIN");
400 PUTCHAR(CB_CONF_ADMIN, bufp);
403 PUTCHAR(5, bufp); /* delay */
404 cbcp_send(us, CBCP_RESP, buf, len);
408 if (cb_type & ( 1 << CB_CONF_NO ) ) {
409 dbglog("cbcp_resp CONF_NO");
410 PUTCHAR(CB_CONF_NO, bufp);
413 cbcp_send(us, CBCP_RESP, buf, len);
414 start_networks(us->us_unit);
420 cbcp_send(us, code, buf, len)
429 outp = outpacket_buf;
433 MAKEHEADER(outp, PPP_CBCP);
436 PUTCHAR(us->us_id, outp);
437 PUTSHORT(outlen, outp);
440 BCOPY(buf, outp, len);
442 output(us->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
446 cbcp_recvack(us, pckt, len)
451 u_char type, delay, addr_type;
457 GETCHAR(opt_len, pckt);
458 if (opt_len >= 2 && opt_len <= len) {
461 GETCHAR(delay, pckt);
464 GETCHAR(addr_type, pckt);
465 memcpy(address, pckt, opt_len - 4);
466 address[opt_len - 4] = 0;
468 dbglog("peer will call: %s", address);
470 if (type == CB_CONF_NO)
476 dbglog("cbcp_recvack: malformed packet");
480 /* ok peer will do callback */
486 lcp_close(0, "Call me back, please");
487 status = EXIT_CALLBACK;