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.
41 #include <sys/types.h>
53 static int setcbcp (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 (int unit);
65 static void cbcp_open (int unit);
66 static void cbcp_lowerup (int unit);
67 static void cbcp_input (int unit, u_char *pkt, int len);
68 static void cbcp_protrej (int unit);
69 static int cbcp_printpkt (u_char *pkt, int len,
70 void (*printer)(void *, char *, ...),
73 struct protent cbcp_protent = {
93 cbcp_state cbcp[NUM_PPP];
95 /* internal prototypes */
97 static void cbcp_recvreq (cbcp_state *us, u_char *pckt, int len);
98 static void cbcp_resp (cbcp_state *us);
99 static void cbcp_up (cbcp_state *us);
100 static void cbcp_recvack (cbcp_state *us, u_char *pckt, int len);
101 static void cbcp_send (cbcp_state *us, int code, u_char *buf, int len);
103 /* option processing */
107 lcp_wantoptions[0].neg_cbcp = 1;
108 cbcp_protent.enabled_flag = 1;
109 cbcp[0].us_number = strdup(*argv);
110 if (cbcp[0].us_number == 0)
111 novm("callback number");
112 cbcp[0].us_type |= (1 << CB_CONF_USER);
113 cbcp[0].us_type |= (1 << CB_CONF_ADMIN);
124 memset(us, 0, sizeof(cbcp_state));
126 us->us_type |= (1 << CB_CONF_NO);
129 /* lower layer is up */
131 cbcp_lowerup(int iface)
133 cbcp_state *us = &cbcp[iface];
135 dbglog("cbcp_lowerup");
136 dbglog("want: %d", us->us_type);
138 if (us->us_type == CB_CONF_USER)
139 dbglog("phone no: %s", us->us_number);
148 /* process an incomming packet */
150 cbcp_input(int unit, u_char *inpacket, int pktlen)
156 cbcp_state *us = &cbcp[unit];
160 if (pktlen < CBCP_MINLEN) {
162 dbglog("CBCP packet is too small");
170 if (len > pktlen || len < CBCP_MINLEN) {
172 dbglog("CBCP packet: invalid length %d", len);
181 cbcp_recvreq(us, inp, len);
186 dbglog("CBCP_RESP received");
190 if (debug && id != us->us_id)
191 dbglog("id doesn't match: expected %d recv %d",
194 cbcp_recvack(us, inp, len);
202 /* protocol was rejected by foe */
203 void cbcp_protrej(int iface)
207 char *cbcp_codenames[] = {
208 "Request", "Response", "Ack"
211 char *cbcp_optionnames[] = {
218 /* pretty print a packet */
220 cbcp_printpkt(u_char *p, int plen,
221 void (*printer) (void *, char *, ...), void *arg)
223 int code, opt, id, len, olen, delay;
226 if (plen < HEADERLEN)
232 if (len < HEADERLEN || len > plen)
235 if (code >= 1 && code <= sizeof(cbcp_codenames) / sizeof(char *))
236 printer(arg, " %s", cbcp_codenames[code-1]);
238 printer(arg, " code=0x%x", code);
240 printer(arg, " id=0x%x", id);
251 if (olen < 2 || olen > len) {
258 if (opt >= 1 && opt <= sizeof(cbcp_optionnames) / sizeof(char *))
259 printer(arg, " %s", cbcp_optionnames[opt-1]);
261 printer(arg, " option=0x%x", opt);
265 printer(arg, " delay = %d", delay);
273 memcpy(str, p, olen - 4);
275 printer(arg, " number = %s", str);
285 for (; len > 0; --len) {
287 printer(arg, " %.2x", code);
293 /* received CBCP request */
295 cbcp_recvreq(cbcp_state *us, u_char *pckt, int pcktlen)
297 u_char type, opt_len, delay, addr_type;
304 dbglog("length: %d", len);
307 GETCHAR(opt_len, pckt);
308 if (opt_len < 2 || opt_len > len)
312 GETCHAR(delay, pckt);
314 us->us_allowed |= (1 << type);
318 dbglog("no callback allowed");
322 dbglog("user callback allowed");
324 GETCHAR(addr_type, pckt);
325 memcpy(address, pckt, opt_len - 4);
326 address[opt_len - 4] = 0;
328 dbglog("address: %s", address);
333 dbglog("user admin defined allowed");
343 dbglog("cbcp_recvreq: malformed packet (%d bytes left)", len);
351 cbcp_resp(cbcp_state *us)
359 cb_type = us->us_allowed & us->us_type;
360 dbglog("cbcp_resp cb_type=%d", cb_type);
364 lcp_down(us->us_unit);
367 if (cb_type & ( 1 << CB_CONF_USER ) ) {
368 dbglog("cbcp_resp CONF_USER");
369 slen = strlen(us->us_number);
371 warn("callback number truncated to 250 characters");
374 PUTCHAR(CB_CONF_USER, bufp);
375 len = 3 + 1 + slen + 1;
377 PUTCHAR(5, bufp); /* delay */
379 BCOPY(us->us_number, bufp, slen + 1);
380 cbcp_send(us, CBCP_RESP, buf, len);
384 if (cb_type & ( 1 << CB_CONF_ADMIN ) ) {
385 dbglog("cbcp_resp CONF_ADMIN");
386 PUTCHAR(CB_CONF_ADMIN, bufp);
389 PUTCHAR(5, bufp); /* delay */
390 cbcp_send(us, CBCP_RESP, buf, len);
394 if (cb_type & ( 1 << CB_CONF_NO ) ) {
395 dbglog("cbcp_resp CONF_NO");
396 PUTCHAR(CB_CONF_NO, bufp);
399 cbcp_send(us, CBCP_RESP, buf, len);
400 start_networks(us->us_unit);
406 cbcp_send(cbcp_state *us, int code, u_char *buf, int len)
411 outp = outpacket_buf;
415 MAKEHEADER(outp, PPP_CBCP);
418 PUTCHAR(us->us_id, outp);
419 PUTSHORT(outlen, outp);
422 BCOPY(buf, outp, len);
424 output(us->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
428 cbcp_recvack(cbcp_state *us, u_char *pckt, int len)
430 u_char type, delay, addr_type;
436 GETCHAR(opt_len, pckt);
437 if (opt_len >= 2 && opt_len <= len) {
440 GETCHAR(delay, pckt);
443 GETCHAR(addr_type, pckt);
444 memcpy(address, pckt, opt_len - 4);
445 address[opt_len - 4] = 0;
447 dbglog("peer will call: %s", address);
449 if (type == CB_CONF_NO)
455 dbglog("cbcp_recvack: malformed packet");
459 /* ok peer will do callback */
461 cbcp_up(cbcp_state *us)
464 status = EXIT_CALLBACK;
465 lcp_close(0, "Call me back, please");