--- /dev/null
+/*
+ * cbcp - Call Back Configuration Protocol.
+ *
+ * Copyright (c) 1995 Pedro Roque Marques
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Pedro Roque Marques. The name of the author may not be used to
+ * endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+static char rcsid[] = "$Id: cbcp.c,v 1.1 1996/10/08 04:35:41 paulus Exp $";
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <syslog.h>
+
+#include "pppd.h"
+#include "cbcp.h"
+#include "fsm.h"
+#include "lcp.h"
+#include "ipcp.h"
+
+/*
+ * Protocol entry points.
+ */
+static void cbcp_init __P((int unit));
+static void cbcp_open __P((int unit));
+static void cbcp_lowerup __P((int unit));
+static void cbcp_input __P((int unit, u_char *pkt, int len));
+static void cbcp_protrej __P((int unit));
+static int cbcp_printpkt __P((u_char *pkt, int len,
+ void (*printer) __P((void *, char *, ...)),
+ void *arg));
+
+struct protent cbcp_protent = {
+ PPP_CBCP,
+ cbcp_init,
+ cbcp_input,
+ cbcp_protrej,
+ cbcp_lowerup,
+ NULL,
+ cbcp_open,
+ NULL,
+ cbcp_printpkt,
+ NULL,
+ 0,
+ "CBCP",
+ NULL,
+ NULL,
+ NULL
+};
+
+cbcp_state cbcp[NUM_PPP];
+
+/* internal prototypes */
+
+void cbcp_recvreq(cbcp_state *us, char *pckt, int len);
+void cbcp_resp(cbcp_state *us);
+void cbcp_up(cbcp_state *us);
+void cbcp_recvack(cbcp_state *us, char *pckt, int len);
+void cbcp_send(cbcp_state *us, u_char code, u_char *buf, int len);
+
+/* init state */
+static void
+cbcp_init(iface)
+ int iface;
+{
+ cbcp_state *us;
+
+ us = &cbcp[iface];
+ memset(us, 0, sizeof(cbcp_state));
+ us->us_unit = iface;
+ us->us_type |= (1 << CB_CONF_NO);
+}
+
+/* lower layer is up */
+static void
+cbcp_lowerup(iface)
+ int iface;
+{
+ cbcp_state *us = &cbcp[iface];
+
+ syslog(LOG_DEBUG, "cbcp_lowerup");
+ syslog(LOG_DEBUG, "want: %d", us->us_type);
+
+ if (us->us_type == CB_CONF_USER)
+ syslog(LOG_DEBUG, "phone no: %s", us->us_number);
+}
+
+static void
+cbcp_open(unit)
+ int unit;
+{
+ syslog(LOG_DEBUG, "cbcp_open");
+}
+
+/* process an incomming packet */
+static void
+cbcp_input(unit, inpacket, pktlen)
+ int unit;
+ u_char *inpacket;
+ int pktlen;
+{
+ u_char *inp;
+ u_char code, id;
+ u_short len;
+
+ cbcp_state *us = &cbcp[unit];
+
+ inp = inpacket;
+
+ if (pktlen < CBCP_MINLEN) {
+ syslog(LOG_ERR, "CBCP packet is too small");
+ return;
+ }
+
+ GETCHAR(code, inp);
+ GETCHAR(id, inp);
+ GETSHORT(len, inp);
+
+#if 0
+ if (len > pktlen) {
+ syslog(LOG_ERR, "CBCP packet: invalid length");
+ return;
+ }
+#endif
+
+ len -= CBCP_MINLEN;
+
+ switch(code) {
+ case CBCP_REQ:
+ us->us_id = id;
+ cbcp_recvreq(us, inp, len);
+ break;
+
+ case CBCP_RESP:
+ syslog(LOG_DEBUG, "CBCP_RESP received");
+ break;
+
+ case CBCP_ACK:
+ if (id != us->us_id)
+ syslog(LOG_DEBUG, "id doesn't match: expected %d recv %d",
+ us->us_id, id);
+
+ cbcp_recvack(us, inp, len);
+ break;
+
+ default:
+ break;
+ }
+}
+
+/* protocol was rejected by foe */
+void cbcp_protrej(int iface)
+{
+}
+
+char *cbcp_codenames[] = {
+ "Request", "Response", "Ack"
+};
+
+char *cbcp_optionnames[] = {
+ "NoCallback",
+ "UserDefined",
+ "AdminDefined",
+ "List"
+};
+
+/* pretty print a packet */
+static int
+cbcp_printpkt(p, plen, printer, arg)
+ u_char *p;
+ int plen;
+ void (*printer) __P((void *, char *, ...));
+ void *arg;
+{
+ int code, opt, id, len, olen, delay;
+ u_char *pstart, *optend;
+ u_short cishort;
+ u_long cilong;
+
+ if (plen < HEADERLEN)
+ return 0;
+ pstart = p;
+ GETCHAR(code, p);
+ GETCHAR(id, p);
+ GETSHORT(len, p);
+ if (len < HEADERLEN || len > plen)
+ return 0;
+
+ if (code >= 1 && code <= sizeof(cbcp_codenames) / sizeof(char *))
+ printer(arg, " %s", cbcp_codenames[code-1]);
+ else
+ printer(arg, " code=0x%x", code);
+
+ printer(arg, " id=0x%x", id);
+ len -= HEADERLEN;
+
+ switch (code) {
+ case CBCP_REQ:
+ case CBCP_RESP:
+ case CBCP_ACK:
+ while(len >= 2) {
+ GETCHAR(opt, p);
+ GETCHAR(olen, p);
+
+ if (olen < 2 || olen > len) {
+ break;
+ }
+
+ printer(arg, " <");
+ len -= olen;
+
+ if (opt >= 1 && opt <= sizeof(cbcp_optionnames) / sizeof(char *))
+ printer(arg, " %s", cbcp_optionnames[opt-1]);
+ else
+ printer(arg, " option=0x%x", opt);
+
+ if (olen > 2) {
+ GETCHAR(delay, p);
+ printer(arg, " delay = %d", delay);
+ }
+
+ if (olen > 3) {
+ int addrt;
+ char str[256];
+
+ GETCHAR(addrt, p);
+ memcpy(str, p, olen - 4);
+ str[olen - 4] = 0;
+ printer(arg, " number = %s", str);
+ }
+ printer(arg, ">");
+ break;
+ }
+
+ default:
+ break;
+ }
+
+ for (; len > 0; --len) {
+ GETCHAR(code, p);
+ printer(arg, " %.2x", code);
+ }
+
+ return p - pstart;
+}
+
+/* received CBCP request */
+static void
+cbcp_recvreq(us, pckt, pcktlen)
+ cbcp_state *us;
+ char *pckt;
+ int pcktlen;
+{
+ u_char type, opt_len, delay, addr_type;
+ char address[256];
+ int len = pcktlen;
+
+ address[0] = 0;
+
+ while (len) {
+ syslog(LOG_DEBUG, "length: %d", len);
+
+ GETCHAR(type, pckt);
+ GETCHAR(opt_len, pckt);
+
+ if (opt_len > 2)
+ GETCHAR(delay, pckt);
+
+ us->us_allowed |= (1 << type);
+
+ switch(type) {
+ case CB_CONF_NO:
+ syslog(LOG_DEBUG, "no callback allowed");
+ break;
+
+ case CB_CONF_USER:
+ syslog(LOG_DEBUG, "user callback allowed");
+ if (opt_len > 4) {
+ GETCHAR(addr_type, pckt);
+ memcpy(address, pckt, opt_len - 4);
+ address[opt_len - 4] = 0;
+ if (address[0])
+ syslog(LOG_DEBUG, "address: %s", address);
+ }
+ break;
+
+ case CB_CONF_ADMIN:
+ syslog(LOG_DEBUG, "user admin defined allowed");
+ break;
+
+ case CB_CONF_LIST:
+ break;
+ }
+ len -= opt_len;
+ }
+
+ cbcp_resp(us);
+}
+
+static void
+cbcp_resp(us)
+ cbcp_state *us;
+{
+ u_char cb_type;
+ u_char buf[256];
+ u_char *bufp = buf;
+ int len = 0;
+
+ cb_type = us->us_allowed & us->us_type;
+ syslog(LOG_DEBUG, "cbcp_resp cb_type=%d", cb_type);
+
+#if 0
+ if (!cb_type)
+ lcp_down(us->us_unit);
+#endif
+
+ if (cb_type & ( 1 << CB_CONF_USER ) ) {
+ syslog(LOG_DEBUG, "cbcp_resp CONF_USER");
+ PUTCHAR(CB_CONF_USER, bufp);
+ len = 3 + 1 + strlen(us->us_number) + 1;
+ PUTCHAR(len , bufp);
+ PUTCHAR(5, bufp); /* delay */
+ PUTCHAR(1, bufp);
+ BCOPY(us->us_number, bufp, strlen(us->us_number) + 1);
+ cbcp_send(us, CBCP_RESP, buf, len);
+ return;
+ }
+
+ if (cb_type & ( 1 << CB_CONF_ADMIN ) ) {
+ syslog(LOG_DEBUG, "cbcp_resp CONF_ADMIN");
+ PUTCHAR(CB_CONF_ADMIN, bufp);
+ len = 3 + 1;
+ PUTCHAR(len , bufp);
+ PUTCHAR(5, bufp); /* delay */
+ PUTCHAR(0, bufp);
+ cbcp_send(us, CBCP_RESP, buf, len);
+ return;
+ }
+
+ if (cb_type & ( 1 << CB_CONF_NO ) ) {
+ syslog(LOG_DEBUG, "cbcp_resp CONF_NO");
+ PUTCHAR(CB_CONF_NO, bufp);
+ len = 3;
+ PUTCHAR(len , bufp);
+ PUTCHAR(0, bufp);
+ cbcp_send(us, CBCP_RESP, buf, len);
+ ipcp_open(us->us_unit);
+ return;
+ }
+}
+
+static void
+cbcp_send(us, code, buf, len)
+ cbcp_state *us;
+ u_char code;
+ u_char *buf;
+ int len;
+{
+ u_char *outp;
+ int outlen;
+
+ outp = outpacket_buf;
+
+ outlen = 4 + len;
+
+ MAKEHEADER(outp, PPP_CBCP);
+
+ PUTCHAR(code, outp);
+ PUTCHAR(us->us_id, outp);
+ PUTSHORT(outlen, outp);
+
+ if (len)
+ BCOPY(buf, outp, len);
+
+ output(us->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
+}
+
+static void
+cbcp_recvack(us, pckt, len)
+ cbcp_state *us;
+ char *pckt;
+ int len;
+{
+ u_char type, delay, addr_type;
+ int opt_len;
+ char address[256];
+
+ if (len) {
+ GETCHAR(type, pckt);
+ GETCHAR(opt_len, pckt);
+
+ if (opt_len > 2)
+ GETCHAR(delay, pckt);
+
+ if (opt_len > 4) {
+ GETCHAR(addr_type, pckt);
+ memcpy(address, pckt, opt_len - 4);
+ address[opt_len - 4] = 0;
+ if (address[0])
+ syslog(LOG_DEBUG, "peer will call: %s", address);
+ }
+ }
+
+ cbcp_up(us);
+}
+
+extern int persist;
+
+/* ok peer will do callback */
+static void
+cbcp_up(us)
+ cbcp_state *us;
+{
+ persist = 0;
+ lcp_close(0);
+}
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