File: [local] / src / usr.sbin / pppd / cbcp.c (download)
Revision 1.9, Sat Jul 28 22:57:27 2018 UTC (5 years, 10 months ago) by deraadt
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8, OPENBSD_6_7_BASE, OPENBSD_6_7, OPENBSD_6_6_BASE, OPENBSD_6_6, OPENBSD_6_5_BASE, OPENBSD_6_5, OPENBSD_6_4_BASE, OPENBSD_6_4, HEAD Changes since 1.8: +12 -33 lines
k&r -> ansi function headers in this file, 'cause clang complained about one.
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/* $OpenBSD: cbcp.c,v 1.9 2018/07/28 22:57:27 deraadt Exp $ */
/*
* cbcp - Call Back Configuration Protocol.
*
* Copyright (c) 1995 Pedro Roque Marques. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name(s) of the authors of this software must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#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(int unit);
static void cbcp_open(int unit);
static void cbcp_lowerup(int unit);
static void cbcp_input(int unit, u_char *pkt, int len);
static void cbcp_protrej(int unit);
static int cbcp_printpkt(u_char *pkt, int len,
void (*printer)(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 */
static void cbcp_recvreq(cbcp_state *us, char *pckt, int len);
static void cbcp_resp(cbcp_state *us);
static void cbcp_up(cbcp_state *us);
static void cbcp_recvack(cbcp_state *us, char *pckt, int len);
static void cbcp_send(cbcp_state *us, u_char code, u_char *buf, int len);
/* init state */
static void
cbcp_init(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(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(int unit)
{
syslog(LOG_DEBUG, "cbcp_open");
}
/* process an incoming packet */
static void
cbcp_input(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 (len < CBCP_MINLEN || len > pktlen) {
syslog(LOG_ERR, "CBCP packet: invalid length");
return;
}
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(u_char *p, int plen, void (*printer)(void *, char *, ...),
void *arg)
{
int code, opt, id, len, olen, delay;
u_char *pstart;
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(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 > 1) {
syslog(LOG_DEBUG, "length: %d", len);
GETCHAR(type, pckt);
GETCHAR(opt_len, pckt);
if (len < opt_len)
break;
len -= opt_len;
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;
}
}
cbcp_resp(us);
}
static void
cbcp_resp(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_protent.open)(us->us_unit);
return;
}
}
static void
cbcp_send(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(cbcp_state *us, char *pckt, int len)
{
u_char type, delay, addr_type;
int opt_len;
char address[256];
if (len > 1) {
GETCHAR(type, pckt);
GETCHAR(opt_len, pckt);
if (opt_len > len)
return;
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(cbcp_state *us)
{
persist = 0;
lcp_close(0, "Call me back, please");
}