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freebsd-skq/usr.sbin/ppp/ipcp.c
Brian Somers 5e3b2d6847 If the peer sends a REQ without the IPADDR option, only reject it 
once.  If they repeat the request (again without the IPADDR option)
ACK it.

I've had reports that some ppp implementations will not assign
themselves an IP number.  This should negotiate with such things.

MFC after:	3 days
2001-07-28 11:32:08 +00:00

1526 lines
45 KiB
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/*-
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/route.h>
#include <netdb.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <resolv.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
#ifndef NONAT
#ifdef LOCALNAT
#include "alias.h"
#else
#include <alias.h>
#endif
#endif
#include "layer.h"
#include "ua.h"
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "proto.h"
#include "iplist.h"
#include "throughput.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "ipcp.h"
#include "filter.h"
#include "descriptor.h"
#include "vjcomp.h"
#include "async.h"
#include "ccp.h"
#include "link.h"
#include "physical.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "bundle.h"
#include "id.h"
#include "arp.h"
#include "systems.h"
#include "prompt.h"
#include "route.h"
#include "iface.h"
#include "ip.h"
#undef REJECTED
#define REJECTED(p, x) ((p)->peer_reject & (1<<(x)))
#define issep(ch) ((ch) == ' ' || (ch) == '\t')
#define isip(ch) (((ch) >= '0' && (ch) <= '9') || (ch) == '.')
static u_short default_urgent_tcp_ports[] = {
21, /* ftp */
22, /* ssh */
23, /* telnet */
513, /* login */
514, /* shell */
543, /* klogin */
544 /* kshell */
};
static u_short default_urgent_udp_ports[] = { };
#define NDEFTCPPORTS \
(sizeof default_urgent_tcp_ports / sizeof default_urgent_tcp_ports[0])
#define NDEFUDPPORTS \
(sizeof default_urgent_udp_ports / sizeof default_urgent_udp_ports[0])
int
ipcp_IsUrgentPort(struct port_range *range, u_short src, u_short dst)
{
int f;
for (f = 0; f < range->nports; f++)
if (range->port[f] == src || range->port[f] == dst)
return 1;
return 0;
}
void
ipcp_AddUrgentPort(struct port_range *range, u_short port)
{
u_short *newport;
int p;
if (range->nports == range->maxports) {
range->maxports += 10;
newport = (u_short *)realloc(range->port,
range->maxports * sizeof(u_short));
if (newport == NULL) {
log_Printf(LogERROR, "ipcp_AddUrgentPort: realloc: %s\n",
strerror(errno));
range->maxports -= 10;
return;
}
range->port = newport;
}
for (p = 0; p < range->nports; p++)
if (range->port[p] == port) {
log_Printf(LogWARN, "%u: Port already set to urgent\n", port);
break;
} else if (range->port[p] > port) {
memmove(range->port + p + 1, range->port + p,
(range->nports - p) * sizeof(u_short));
range->port[p] = port;
range->nports++;
break;
}
if (p == range->nports)
range->port[range->nports++] = port;
}
void
ipcp_RemoveUrgentPort(struct port_range *range, u_short port)
{
int p;
for (p = 0; p < range->nports; p++)
if (range->port[p] == port) {
if (p != range->nports - 1)
memmove(range->port + p, range->port + p + 1,
(range->nports - p - 1) * sizeof(u_short));
range->nports--;
return;
}
if (p == range->nports)
log_Printf(LogWARN, "%u: Port not set to urgent\n", port);
}
void
ipcp_ClearUrgentPorts(struct port_range *range)
{
range->nports = 0;
}
struct compreq {
u_short proto;
u_char slots;
u_char compcid;
};
static int IpcpLayerUp(struct fsm *);
static void IpcpLayerDown(struct fsm *);
static void IpcpLayerStart(struct fsm *);
static void IpcpLayerFinish(struct fsm *);
static void IpcpInitRestartCounter(struct fsm *, int);
static void IpcpSendConfigReq(struct fsm *);
static void IpcpSentTerminateReq(struct fsm *);
static void IpcpSendTerminateAck(struct fsm *, u_char);
static void IpcpDecodeConfig(struct fsm *, u_char *, int, int,
struct fsm_decode *);
static struct fsm_callbacks ipcp_Callbacks = {
IpcpLayerUp,
IpcpLayerDown,
IpcpLayerStart,
IpcpLayerFinish,
IpcpInitRestartCounter,
IpcpSendConfigReq,
IpcpSentTerminateReq,
IpcpSendTerminateAck,
IpcpDecodeConfig,
fsm_NullRecvResetReq,
fsm_NullRecvResetAck
};
static const char *
protoname(int proto)
{
static struct {
int id;
const char *txt;
} cftypes[] = {
/* Check out the latest ``Assigned numbers'' rfc (rfc1700.txt) */
{ 1, "IPADDRS" }, /* IP-Addresses */ /* deprecated */
{ 2, "COMPPROTO" }, /* IP-Compression-Protocol */
{ 3, "IPADDR" }, /* IP-Address */
{ 129, "PRIDNS" }, /* 129: Primary DNS Server Address */
{ 130, "PRINBNS" }, /* 130: Primary NBNS Server Address */
{ 131, "SECDNS" }, /* 131: Secondary DNS Server Address */
{ 132, "SECNBNS" } /* 132: Secondary NBNS Server Address */
};
int f;
for (f = 0; f < sizeof cftypes / sizeof *cftypes; f++)
if (cftypes[f].id == proto)
return cftypes[f].txt;
return NumStr(proto, NULL, 0);
}
void
ipcp_AddInOctets(struct ipcp *ipcp, int n)
{
throughput_addin(&ipcp->throughput, n);
}
void
ipcp_AddOutOctets(struct ipcp *ipcp, int n)
{
throughput_addout(&ipcp->throughput, n);
}
void
ipcp_LoadDNS(struct ipcp *ipcp)
{
int fd;
ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr = INADDR_NONE;
if (ipcp->ns.resolv != NULL) {
free(ipcp->ns.resolv);
ipcp->ns.resolv = NULL;
}
if (ipcp->ns.resolv_nons != NULL) {
free(ipcp->ns.resolv_nons);
ipcp->ns.resolv_nons = NULL;
}
ipcp->ns.resolver = 0;
if ((fd = open(_PATH_RESCONF, O_RDONLY)) != -1) {
struct stat st;
if (fstat(fd, &st) == 0) {
ssize_t got;
if ((ipcp->ns.resolv_nons = (char *)malloc(st.st_size + 1)) == NULL)
log_Printf(LogERROR, "Failed to malloc %lu for %s: %s\n",
(unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
else if ((ipcp->ns.resolv = (char *)malloc(st.st_size + 1)) == NULL) {
log_Printf(LogERROR, "Failed(2) to malloc %lu for %s: %s\n",
(unsigned long)st.st_size, _PATH_RESCONF, strerror(errno));
free(ipcp->ns.resolv_nons);
ipcp->ns.resolv_nons = NULL;
} else if ((got = read(fd, ipcp->ns.resolv, st.st_size)) != st.st_size) {
if (got == -1)
log_Printf(LogERROR, "Failed to read %s: %s\n",
_PATH_RESCONF, strerror(errno));
else
log_Printf(LogERROR, "Failed to read %s, got %lu not %lu\n",
_PATH_RESCONF, (unsigned long)got,
(unsigned long)st.st_size);
free(ipcp->ns.resolv_nons);
ipcp->ns.resolv_nons = NULL;
free(ipcp->ns.resolv);
ipcp->ns.resolv = NULL;
} else {
char *cp, *cp_nons, *ncp, ch;
int n;
ipcp->ns.resolv[st.st_size] = '\0';
ipcp->ns.resolver = 1;
cp_nons = ipcp->ns.resolv_nons;
cp = ipcp->ns.resolv;
n = 0;
while ((ncp = strstr(cp, "nameserver")) != NULL) {
if (ncp != cp) {
memcpy(cp_nons, cp, ncp - cp);
cp_nons += ncp - cp;
}
if ((ncp != cp && ncp[-1] != '\n') || !issep(ncp[10])) {
memcpy(cp_nons, ncp, 9);
cp_nons += 9;
cp = ncp + 9; /* Can't match "nameserver" at cp... */
continue;
}
for (cp = ncp + 11; issep(*cp); cp++) /* Skip whitespace */
;
for (ncp = cp; isip(*ncp); ncp++) /* Jump over IP */
;
ch = *ncp;
*ncp = '\0';
if (n < 2 && inet_aton(cp, ipcp->ns.dns + n))
n++;
*ncp = ch;
if ((cp = strchr(ncp, '\n')) == NULL) /* Point at next line */
cp = ncp + strlen(ncp);
else
cp++;
}
strcpy(cp_nons, cp); /* Copy the end - including the NUL */
cp_nons += strlen(cp_nons) - 1;
while (cp_nons >= ipcp->ns.resolv_nons && *cp_nons == '\n')
*cp_nons-- = '\0';
if (n == 2 && ipcp->ns.dns[0].s_addr == INADDR_ANY) {
ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
ipcp->ns.dns[1].s_addr = INADDR_ANY;
}
bundle_AdjustDNS(ipcp->fsm.bundle, ipcp->ns.dns);
}
} else
log_Printf(LogERROR, "Failed to stat opened %s: %s\n",
_PATH_RESCONF, strerror(errno));
close(fd);
}
}
int
ipcp_WriteDNS(struct ipcp *ipcp)
{
const char *paddr;
mode_t mask;
FILE *fp;
if (ipcp->ns.dns[0].s_addr == INADDR_ANY &&
ipcp->ns.dns[1].s_addr == INADDR_ANY) {
log_Printf(LogIPCP, "%s not modified: All nameservers NAKd\n",
_PATH_RESCONF);
return 0;
}
if (ipcp->ns.dns[0].s_addr == INADDR_ANY) {
ipcp->ns.dns[0].s_addr = ipcp->ns.dns[1].s_addr;
ipcp->ns.dns[1].s_addr = INADDR_ANY;
}
mask = umask(022);
if ((fp = ID0fopen(_PATH_RESCONF, "w")) != NULL) {
umask(mask);
if (ipcp->ns.resolv_nons)
fputs(ipcp->ns.resolv_nons, fp);
paddr = inet_ntoa(ipcp->ns.dns[0]);
log_Printf(LogIPCP, "Primary nameserver set to %s\n", paddr);
fprintf(fp, "\nnameserver %s\n", paddr);
if (ipcp->ns.dns[1].s_addr != INADDR_ANY &&
ipcp->ns.dns[1].s_addr != INADDR_NONE &&
ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr) {
paddr = inet_ntoa(ipcp->ns.dns[1]);
log_Printf(LogIPCP, "Secondary nameserver set to %s\n", paddr);
fprintf(fp, "nameserver %s\n", paddr);
}
if (fclose(fp) == EOF) {
log_Printf(LogERROR, "write(): Failed updating %s: %s\n", _PATH_RESCONF,
strerror(errno));
return 0;
}
} else
umask(mask);
return 1;
}
void
ipcp_RestoreDNS(struct ipcp *ipcp)
{
if (ipcp->ns.resolver) {
ssize_t got;
size_t len;
int fd;
if ((fd = ID0open(_PATH_RESCONF, O_WRONLY|O_TRUNC, 0644)) != -1) {
len = strlen(ipcp->ns.resolv);
if ((got = write(fd, ipcp->ns.resolv, len)) != len) {
if (got == -1)
log_Printf(LogERROR, "Failed rewriting %s: write: %s\n",
_PATH_RESCONF, strerror(errno));
else
log_Printf(LogERROR, "Failed rewriting %s: wrote %lu of %lu\n",
_PATH_RESCONF, (unsigned long)got, (unsigned long)len);
}
close(fd);
} else
log_Printf(LogERROR, "Failed rewriting %s: open: %s\n", _PATH_RESCONF,
strerror(errno));
} else if (remove(_PATH_RESCONF) == -1)
log_Printf(LogERROR, "Failed removing %s: %s\n", _PATH_RESCONF,
strerror(errno));
}
int
ipcp_Show(struct cmdargs const *arg)
{
struct ipcp *ipcp = &arg->bundle->ncp.ipcp;
int p;
prompt_Printf(arg->prompt, "%s [%s]\n", ipcp->fsm.name,
State2Nam(ipcp->fsm.state));
if (ipcp->fsm.state == ST_OPENED) {
prompt_Printf(arg->prompt, " His side: %s, %s\n",
inet_ntoa(ipcp->peer_ip), vj2asc(ipcp->peer_compproto));
prompt_Printf(arg->prompt, " My side: %s, %s\n",
inet_ntoa(ipcp->my_ip), vj2asc(ipcp->my_compproto));
prompt_Printf(arg->prompt, " Queued packets: %lu\n",
(unsigned long)ip_QueueLen(ipcp));
}
if (ipcp->route) {
prompt_Printf(arg->prompt, "\n");
route_ShowSticky(arg->prompt, ipcp->route, "Sticky routes", 1);
}
prompt_Printf(arg->prompt, "\nDefaults:\n");
prompt_Printf(arg->prompt, " FSM retry = %us, max %u Config"
" REQ%s, %u Term REQ%s\n", ipcp->cfg.fsm.timeout,
ipcp->cfg.fsm.maxreq, ipcp->cfg.fsm.maxreq == 1 ? "" : "s",
ipcp->cfg.fsm.maxtrm, ipcp->cfg.fsm.maxtrm == 1 ? "" : "s");
prompt_Printf(arg->prompt, " My Address: %s/%d",
inet_ntoa(ipcp->cfg.my_range.ipaddr), ipcp->cfg.my_range.width);
prompt_Printf(arg->prompt, ", netmask %s\n", inet_ntoa(ipcp->cfg.netmask));
if (ipcp->cfg.HaveTriggerAddress)
prompt_Printf(arg->prompt, " Trigger address: %s\n",
inet_ntoa(ipcp->cfg.TriggerAddress));
prompt_Printf(arg->prompt, " VJ compression: %s (%d slots %s slot "
"compression)\n", command_ShowNegval(ipcp->cfg.vj.neg),
ipcp->cfg.vj.slots, ipcp->cfg.vj.slotcomp ? "with" : "without");
if (iplist_isvalid(&ipcp->cfg.peer_list))
prompt_Printf(arg->prompt, " His Address: %s\n",
ipcp->cfg.peer_list.src);
else
prompt_Printf(arg->prompt, " His Address: %s/%d\n",
inet_ntoa(ipcp->cfg.peer_range.ipaddr),
ipcp->cfg.peer_range.width);
prompt_Printf(arg->prompt, " DNS: %s",
ipcp->cfg.ns.dns[0].s_addr == INADDR_NONE ?
"none" : inet_ntoa(ipcp->cfg.ns.dns[0]));
if (ipcp->cfg.ns.dns[1].s_addr != INADDR_NONE)
prompt_Printf(arg->prompt, ", %s", inet_ntoa(ipcp->cfg.ns.dns[1]));
prompt_Printf(arg->prompt, ", %s\n",
command_ShowNegval(ipcp->cfg.ns.dns_neg));
prompt_Printf(arg->prompt, " Resolver DNS: %s",
ipcp->ns.dns[0].s_addr == INADDR_NONE ?
"none" : inet_ntoa(ipcp->ns.dns[0]));
if (ipcp->ns.dns[1].s_addr != INADDR_NONE &&
ipcp->ns.dns[1].s_addr != ipcp->ns.dns[0].s_addr)
prompt_Printf(arg->prompt, ", %s", inet_ntoa(ipcp->ns.dns[1]));
prompt_Printf(arg->prompt, "\n NetBIOS NS: %s, ",
inet_ntoa(ipcp->cfg.ns.nbns[0]));
prompt_Printf(arg->prompt, "%s\n", inet_ntoa(ipcp->cfg.ns.nbns[1]));
prompt_Printf(arg->prompt, " Urgent ports\n");
prompt_Printf(arg->prompt, " TCP: ");
if (ipcp->cfg.urgent.tcp.nports == 0)
prompt_Printf(arg->prompt, "none");
else
for (p = 0; p < ipcp->cfg.urgent.tcp.nports; p++) {
if (p)
prompt_Printf(arg->prompt, ", ");
prompt_Printf(arg->prompt, "%u", ipcp->cfg.urgent.tcp.port[p]);
}
prompt_Printf(arg->prompt, "\n UDP: ");
if (ipcp->cfg.urgent.udp.nports == 0)
prompt_Printf(arg->prompt, "none");
else
for (p = 0; p < ipcp->cfg.urgent.udp.nports; p++) {
if (p)
prompt_Printf(arg->prompt, ", ");
prompt_Printf(arg->prompt, "%u", ipcp->cfg.urgent.udp.port[p]);
}
prompt_Printf(arg->prompt, "\n TOS: %s\n\n",
ipcp->cfg.urgent.tos ? "yes" : "no");
throughput_disp(&ipcp->throughput, arg->prompt);
return 0;
}
int
ipcp_vjset(struct cmdargs const *arg)
{
if (arg->argc != arg->argn+2)
return -1;
if (!strcasecmp(arg->argv[arg->argn], "slots")) {
int slots;
slots = atoi(arg->argv[arg->argn+1]);
if (slots < 4 || slots > 16)
return 1;
arg->bundle->ncp.ipcp.cfg.vj.slots = slots;
return 0;
} else if (!strcasecmp(arg->argv[arg->argn], "slotcomp")) {
if (!strcasecmp(arg->argv[arg->argn+1], "on"))
arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 1;
else if (!strcasecmp(arg->argv[arg->argn+1], "off"))
arg->bundle->ncp.ipcp.cfg.vj.slotcomp = 0;
else
return 2;
return 0;
}
return -1;
}
void
ipcp_Init(struct ipcp *ipcp, struct bundle *bundle, struct link *l,
const struct fsm_parent *parent)
{
struct hostent *hp;
char name[MAXHOSTNAMELEN];
static const char * const timer_names[] =
{"IPCP restart", "IPCP openmode", "IPCP stopped"};
fsm_Init(&ipcp->fsm, "IPCP", PROTO_IPCP, 1, IPCP_MAXCODE, LogIPCP,
bundle, l, parent, &ipcp_Callbacks, timer_names);
ipcp->route = NULL;
ipcp->cfg.vj.slots = DEF_VJ_STATES;
ipcp->cfg.vj.slotcomp = 1;
memset(&ipcp->cfg.my_range, '\0', sizeof ipcp->cfg.my_range);
if (gethostname(name, sizeof name) == 0) {
hp = gethostbyname(name);
if (hp && hp->h_addrtype == AF_INET)
memcpy(&ipcp->cfg.my_range.ipaddr.s_addr, hp->h_addr, hp->h_length);
}
ipcp->cfg.netmask.s_addr = INADDR_ANY;
memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
iplist_setsrc(&ipcp->cfg.peer_list, "");
ipcp->cfg.HaveTriggerAddress = 0;
ipcp->cfg.ns.dns[0].s_addr = INADDR_NONE;
ipcp->cfg.ns.dns[1].s_addr = INADDR_NONE;
ipcp->cfg.ns.dns_neg = 0;
ipcp->cfg.ns.nbns[0].s_addr = INADDR_ANY;
ipcp->cfg.ns.nbns[1].s_addr = INADDR_ANY;
ipcp->cfg.urgent.tcp.nports = ipcp->cfg.urgent.tcp.maxports = NDEFTCPPORTS;
ipcp->cfg.urgent.tcp.port = (u_short *)malloc(NDEFTCPPORTS * sizeof(u_short));
memcpy(ipcp->cfg.urgent.tcp.port, default_urgent_tcp_ports,
NDEFTCPPORTS * sizeof(u_short));
ipcp->cfg.urgent.tos = 1;
ipcp->cfg.urgent.udp.nports = ipcp->cfg.urgent.udp.maxports = NDEFUDPPORTS;
ipcp->cfg.urgent.udp.port = (u_short *)malloc(NDEFUDPPORTS * sizeof(u_short));
memcpy(ipcp->cfg.urgent.udp.port, default_urgent_udp_ports,
NDEFUDPPORTS * sizeof(u_short));
ipcp->cfg.fsm.timeout = DEF_FSMRETRY;
ipcp->cfg.fsm.maxreq = DEF_FSMTRIES;
ipcp->cfg.fsm.maxtrm = DEF_FSMTRIES;
ipcp->cfg.vj.neg = NEG_ENABLED|NEG_ACCEPTED;
memset(&ipcp->vj, '\0', sizeof ipcp->vj);
ipcp->ns.resolv = NULL;
ipcp->ns.resolv_nons = NULL;
ipcp->ns.writable = 1;
ipcp_LoadDNS(ipcp);
throughput_init(&ipcp->throughput, SAMPLE_PERIOD);
memset(ipcp->Queue, '\0', sizeof ipcp->Queue);
ipcp_Setup(ipcp, INADDR_NONE);
}
void
ipcp_Destroy(struct ipcp *ipcp)
{
if (ipcp->cfg.urgent.tcp.maxports) {
ipcp->cfg.urgent.tcp.nports = ipcp->cfg.urgent.tcp.maxports = 0;
free(ipcp->cfg.urgent.tcp.port);
ipcp->cfg.urgent.tcp.port = NULL;
}
if (ipcp->cfg.urgent.udp.maxports) {
ipcp->cfg.urgent.udp.nports = ipcp->cfg.urgent.udp.maxports = 0;
free(ipcp->cfg.urgent.udp.port);
ipcp->cfg.urgent.udp.port = NULL;
}
if (ipcp->ns.resolv != NULL) {
free(ipcp->ns.resolv);
ipcp->ns.resolv = NULL;
}
if (ipcp->ns.resolv_nons != NULL) {
free(ipcp->ns.resolv_nons);
ipcp->ns.resolv_nons = NULL;
}
}
void
ipcp_SetLink(struct ipcp *ipcp, struct link *l)
{
ipcp->fsm.link = l;
}
void
ipcp_Setup(struct ipcp *ipcp, u_int32_t mask)
{
struct iface *iface = ipcp->fsm.bundle->iface;
int pos, n;
ipcp->fsm.open_mode = 0;
ipcp->ifmask.s_addr = mask == INADDR_NONE ? ipcp->cfg.netmask.s_addr : mask;
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
/* Try to give the peer a previously configured IP address */
for (n = 0; n < iface->in_addrs; n++) {
pos = iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd);
if (pos != -1) {
ipcp->cfg.peer_range.ipaddr =
iplist_setcurpos(&ipcp->cfg.peer_list, pos);
break;
}
}
if (n == iface->in_addrs)
/* Ok, so none of 'em fit.... pick a random one */
ipcp->cfg.peer_range.ipaddr = iplist_setrandpos(&ipcp->cfg.peer_list);
ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST;
ipcp->cfg.peer_range.width = 32;
}
ipcp->heis1172 = 0;
ipcp->peer_req = 0;
ipcp->peer_ip = ipcp->cfg.peer_range.ipaddr;
ipcp->peer_compproto = 0;
if (ipcp->cfg.HaveTriggerAddress) {
/*
* Some implementations of PPP require that we send a
* *special* value as our address, even though the rfc specifies
* full negotiation (e.g. "0.0.0.0" or Not "0.0.0.0").
*/
ipcp->my_ip = ipcp->cfg.TriggerAddress;
log_Printf(LogIPCP, "Using trigger address %s\n",
inet_ntoa(ipcp->cfg.TriggerAddress));
} else {
/*
* Otherwise, if we've used an IP number before and it's still within
* the network specified on the ``set ifaddr'' line, we really
* want to keep that IP number so that we can keep any existing
* connections that are bound to that IP (assuming we're not
* ``iface-alias''ing).
*/
for (n = 0; n < iface->in_addrs; n++)
if ((iface->in_addr[n].ifa.s_addr & ipcp->cfg.my_range.mask.s_addr) ==
(ipcp->cfg.my_range.ipaddr.s_addr & ipcp->cfg.my_range.mask.s_addr)) {
ipcp->my_ip = iface->in_addr[n].ifa;
break;
}
if (n == iface->in_addrs)
ipcp->my_ip = ipcp->cfg.my_range.ipaddr;
}
if (IsEnabled(ipcp->cfg.vj.neg)
#ifndef NORADIUS
|| (ipcp->fsm.bundle->radius.valid && ipcp->fsm.bundle->radius.vj)
#endif
)
ipcp->my_compproto = (PROTO_VJCOMP << 16) +
((ipcp->cfg.vj.slots - 1) << 8) +
ipcp->cfg.vj.slotcomp;
else
ipcp->my_compproto = 0;
sl_compress_init(&ipcp->vj.cslc, ipcp->cfg.vj.slots - 1);
ipcp->peer_reject = 0;
ipcp->my_reject = 0;
/* Copy startup values into ipcp->dns? */
if (ipcp->cfg.ns.dns[0].s_addr != INADDR_NONE)
memcpy(ipcp->dns, ipcp->cfg.ns.dns, sizeof ipcp->dns);
else if (ipcp->ns.dns[0].s_addr != INADDR_NONE)
memcpy(ipcp->dns, ipcp->ns.dns, sizeof ipcp->dns);
else
ipcp->dns[0].s_addr = ipcp->dns[1].s_addr = INADDR_ANY;
if (ipcp->dns[1].s_addr == INADDR_NONE)
ipcp->dns[1] = ipcp->dns[0];
}
static int
ipcp_doproxyall(struct bundle *bundle,
int (*proxyfun)(struct bundle *, struct in_addr, int), int s)
{
int n, ret;
struct sticky_route *rp;
struct in_addr addr;
struct ipcp *ipcp;
ipcp = &bundle->ncp.ipcp;
for (rp = ipcp->route; rp != NULL; rp = rp->next) {
if (rp->mask.s_addr == INADDR_BROADCAST)
continue;
n = ntohl(INADDR_BROADCAST) - ntohl(rp->mask.s_addr) - 1;
if (n > 0 && n <= 254 && rp->dst.s_addr != INADDR_ANY) {
addr = rp->dst;
while (n--) {
addr.s_addr = htonl(ntohl(addr.s_addr) + 1);
log_Printf(LogDEBUG, "ipcp_doproxyall: %s\n", inet_ntoa(addr));
ret = (*proxyfun)(bundle, addr, s);
if (!ret)
return ret;
}
}
}
return 0;
}
static int
ipcp_SetIPaddress(struct bundle *bundle, struct in_addr myaddr,
struct in_addr hisaddr, int silent)
{
struct in_addr mask, oaddr;
mask = addr2mask(myaddr);
if (bundle->ncp.ipcp.ifmask.s_addr != INADDR_ANY &&
(bundle->ncp.ipcp.ifmask.s_addr & mask.s_addr) == mask.s_addr)
mask.s_addr = bundle->ncp.ipcp.ifmask.s_addr;
oaddr.s_addr = bundle->iface->in_addrs ?
bundle->iface->in_addr[0].ifa.s_addr : INADDR_ANY;
if (!iface_inAdd(bundle->iface, myaddr, mask, hisaddr,
IFACE_ADD_FIRST|IFACE_FORCE_ADD))
return -1;
if (!Enabled(bundle, OPT_IFACEALIAS) && bundle->iface->in_addrs > 1
&& myaddr.s_addr != oaddr.s_addr)
/* Nuke the old one */
iface_inDelete(bundle->iface, oaddr);
if (bundle->ncp.ipcp.cfg.sendpipe > 0 || bundle->ncp.ipcp.cfg.recvpipe > 0)
rt_Update(bundle, hisaddr, myaddr);
if (Enabled(bundle, OPT_SROUTES))
route_Change(bundle, bundle->ncp.ipcp.route, myaddr, hisaddr,
bundle->ncp.ipcp.ns.dns);
#ifndef NORADIUS
if (bundle->radius.valid)
route_Change(bundle, bundle->radius.routes, myaddr, hisaddr,
bundle->ncp.ipcp.ns.dns);
#endif
if (Enabled(bundle, OPT_PROXY) || Enabled(bundle, OPT_PROXYALL)) {
int s = ID0socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
log_Printf(LogERROR, "ipcp_SetIPaddress: socket(): %s\n",
strerror(errno));
else {
if (Enabled(bundle, OPT_PROXYALL))
ipcp_doproxyall(bundle, arp_SetProxy, s);
else if (Enabled(bundle, OPT_PROXY))
arp_SetProxy(bundle, hisaddr, s);
close(s);
}
}
return 0;
}
static struct in_addr
ChooseHisAddr(struct bundle *bundle, struct in_addr gw)
{
struct in_addr try;
u_long f;
for (f = 0; f < bundle->ncp.ipcp.cfg.peer_list.nItems; f++) {
try = iplist_next(&bundle->ncp.ipcp.cfg.peer_list);
log_Printf(LogDEBUG, "ChooseHisAddr: Check item %ld (%s)\n",
f, inet_ntoa(try));
if (ipcp_SetIPaddress(bundle, gw, try, 1) == 0) {
log_Printf(LogIPCP, "Selected IP address %s\n", inet_ntoa(try));
break;
}
}
if (f == bundle->ncp.ipcp.cfg.peer_list.nItems) {
log_Printf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n");
try.s_addr = INADDR_ANY;
}
return try;
}
static void
IpcpInitRestartCounter(struct fsm *fp, int what)
{
/* Set fsm timer load */
struct ipcp *ipcp = fsm2ipcp(fp);
fp->FsmTimer.load = ipcp->cfg.fsm.timeout * SECTICKS;
switch (what) {
case FSM_REQ_TIMER:
fp->restart = ipcp->cfg.fsm.maxreq;
break;
case FSM_TRM_TIMER:
fp->restart = ipcp->cfg.fsm.maxtrm;
break;
default:
fp->restart = 1;
break;
}
}
static void
IpcpSendConfigReq(struct fsm *fp)
{
/* Send config REQ please */
struct physical *p = link2physical(fp->link);
struct ipcp *ipcp = fsm2ipcp(fp);
u_char buff[24];
struct lcp_opt *o;
o = (struct lcp_opt *)buff;
if ((p && !physical_IsSync(p)) || !REJECTED(ipcp, TY_IPADDR)) {
memcpy(o->data, &ipcp->my_ip.s_addr, 4);
INC_LCP_OPT(TY_IPADDR, 6, o);
}
if (ipcp->my_compproto && !REJECTED(ipcp, TY_COMPPROTO)) {
if (ipcp->heis1172) {
u_int16_t proto = PROTO_VJCOMP;
ua_htons(&proto, o->data);
INC_LCP_OPT(TY_COMPPROTO, 4, o);
} else {
struct compreq req;
req.proto = htons(ipcp->my_compproto >> 16);
req.slots = (ipcp->my_compproto >> 8) & 255;
req.compcid = ipcp->my_compproto & 1;
memcpy(o->data, &req, 4);
INC_LCP_OPT(TY_COMPPROTO, 6, o);
}
}
if (IsEnabled(ipcp->cfg.ns.dns_neg) &&
!REJECTED(ipcp, TY_PRIMARY_DNS - TY_ADJUST_NS)) {
memcpy(o->data, &ipcp->dns[0].s_addr, 4);
INC_LCP_OPT(TY_PRIMARY_DNS, 6, o);
}
if (IsEnabled(ipcp->cfg.ns.dns_neg) &&
!REJECTED(ipcp, TY_SECONDARY_DNS - TY_ADJUST_NS)) {
memcpy(o->data, &ipcp->dns[1].s_addr, 4);
INC_LCP_OPT(TY_SECONDARY_DNS, 6, o);
}
fsm_Output(fp, CODE_CONFIGREQ, fp->reqid, buff, (u_char *)o - buff,
MB_IPCPOUT);
}
static void
IpcpSentTerminateReq(struct fsm *fp)
{
/* Term REQ just sent by FSM */
}
static void
IpcpSendTerminateAck(struct fsm *fp, u_char id)
{
/* Send Term ACK please */
fsm_Output(fp, CODE_TERMACK, id, NULL, 0, MB_IPCPOUT);
}
static void
IpcpLayerStart(struct fsm *fp)
{
/* We're about to start up ! */
struct ipcp *ipcp = fsm2ipcp(fp);
log_Printf(LogIPCP, "%s: LayerStart.\n", fp->link->name);
throughput_start(&ipcp->throughput, "IPCP throughput",
Enabled(fp->bundle, OPT_THROUGHPUT));
fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
ipcp->peer_req = 0;
}
static void
IpcpLayerFinish(struct fsm *fp)
{
/* We're now down */
struct ipcp *ipcp = fsm2ipcp(fp);
log_Printf(LogIPCP, "%s: LayerFinish.\n", fp->link->name);
throughput_stop(&ipcp->throughput);
throughput_log(&ipcp->throughput, LogIPCP, NULL);
}
void
ipcp_CleanInterface(struct ipcp *ipcp)
{
struct iface *iface = ipcp->fsm.bundle->iface;
if (iface->in_addrs && (Enabled(ipcp->fsm.bundle, OPT_PROXY) ||
Enabled(ipcp->fsm.bundle, OPT_PROXYALL))) {
int s = ID0socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
log_Printf(LogERROR, "ipcp_CleanInterface: socket: %s\n",
strerror(errno));
else {
if (Enabled(ipcp->fsm.bundle, OPT_PROXYALL))
ipcp_doproxyall(ipcp->fsm.bundle, arp_ClearProxy, s);
else if (Enabled(ipcp->fsm.bundle, OPT_PROXY))
arp_ClearProxy(ipcp->fsm.bundle, iface->in_addr[0].brd, s);
close(s);
}
}
iface_inClear(ipcp->fsm.bundle->iface, IFACE_CLEAR_ALL);
}
static void
IpcpLayerDown(struct fsm *fp)
{
/* About to come down */
static int recursing;
struct ipcp *ipcp = fsm2ipcp(fp);
const char *s;
if (!recursing++) {
if (ipcp->fsm.bundle->iface->in_addrs)
s = inet_ntoa(ipcp->fsm.bundle->iface->in_addr[0].ifa);
else
s = "Interface configuration error !";
log_Printf(LogIPCP, "%s: LayerDown: %s\n", fp->link->name, s);
#ifndef NORADIUS
radius_Account(&fp->bundle->radius, &fp->bundle->radacct,
fp->bundle->links, RAD_STOP, &ipcp->peer_ip, &ipcp->ifmask,
&ipcp->throughput);
#endif
/*
* XXX this stuff should really live in the FSM. Our config should
* associate executable sections in files with events.
*/
if (system_Select(fp->bundle, s, LINKDOWNFILE, NULL, NULL) < 0) {
if (bundle_GetLabel(fp->bundle)) {
if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
LINKDOWNFILE, NULL, NULL) < 0)
system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
} else
system_Select(fp->bundle, "MYADDR", LINKDOWNFILE, NULL, NULL);
}
ipcp_Setup(ipcp, INADDR_NONE);
}
recursing--;
}
int
ipcp_InterfaceUp(struct ipcp *ipcp)
{
if (ipcp_SetIPaddress(ipcp->fsm.bundle, ipcp->my_ip, ipcp->peer_ip, 0) < 0) {
log_Printf(LogERROR, "ipcp_InterfaceUp: unable to set ip address\n");
return 0;
}
if (!iface_SetFlags(ipcp->fsm.bundle->iface->name, IFF_UP)) {
log_Printf(LogERROR, "ipcp_InterfaceUp: Can't set the IFF_UP flag on %s\n",
ipcp->fsm.bundle->iface->name);
return 0;
}
#ifndef NONAT
if (ipcp->fsm.bundle->NatEnabled)
PacketAliasSetAddress(ipcp->my_ip);
#endif
return 1;
}
static int
IpcpLayerUp(struct fsm *fp)
{
/* We're now up */
struct ipcp *ipcp = fsm2ipcp(fp);
char tbuff[16];
log_Printf(LogIPCP, "%s: LayerUp.\n", fp->link->name);
snprintf(tbuff, sizeof tbuff, "%s", inet_ntoa(ipcp->my_ip));
log_Printf(LogIPCP, "myaddr %s hisaddr = %s\n",
tbuff, inet_ntoa(ipcp->peer_ip));
if (ipcp->peer_compproto >> 16 == PROTO_VJCOMP)
sl_compress_init(&ipcp->vj.cslc, (ipcp->peer_compproto >> 8) & 255);
if (!ipcp_InterfaceUp(ipcp))
return 0;
#ifndef NORADIUS
radius_Account(&fp->bundle->radius, &fp->bundle->radacct, fp->bundle->links,
RAD_START, &ipcp->peer_ip, &ipcp->ifmask, &ipcp->throughput);
#endif
/*
* XXX this stuff should really live in the FSM. Our config should
* associate executable sections in files with events.
*/
if (system_Select(fp->bundle, tbuff, LINKUPFILE, NULL, NULL) < 0) {
if (bundle_GetLabel(fp->bundle)) {
if (system_Select(fp->bundle, bundle_GetLabel(fp->bundle),
LINKUPFILE, NULL, NULL) < 0)
system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
} else
system_Select(fp->bundle, "MYADDR", LINKUPFILE, NULL, NULL);
}
fp->more.reqs = fp->more.naks = fp->more.rejs = ipcp->cfg.fsm.maxreq * 3;
log_DisplayPrompts();
return 1;
}
static int
AcceptableAddr(const struct in_range *prange, struct in_addr ipaddr)
{
/* Is the given IP in the given range ? */
return (prange->ipaddr.s_addr & prange->mask.s_addr) ==
(ipaddr.s_addr & prange->mask.s_addr) && ipaddr.s_addr;
}
static void
ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec)
{
struct bundle *bundle = ipcp->fsm.bundle;
struct iface *iface = bundle->iface;
int n;
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
if (ip.s_addr == INADDR_ANY ||
iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 ||
ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr, ip, 1)) {
log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
inet_ntoa(ip));
/*
* If we've already had a valid address configured for the peer,
* try NAKing with that so that we don't have to upset things
* too much.
*/
for (n = 0; n < iface->in_addrs; n++)
if (iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd) >= 0) {
ipcp->peer_ip = iface->in_addr[n].brd;
break;
}
if (n == iface->in_addrs)
/* Just pick an IP number from our list */
ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->cfg.my_range.ipaddr);
if (ipcp->peer_ip.s_addr == INADDR_ANY) {
*dec->rejend++ = TY_IPADDR;
*dec->rejend++ = 6;
memcpy(dec->rejend, &ip.s_addr, 4);
dec->rejend += 4;
} else {
*dec->nakend++ = TY_IPADDR;
*dec->nakend++ = 6;
memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
dec->nakend += 4;
}
return;
}
} else if (!AcceptableAddr(&ipcp->cfg.peer_range, ip)) {
/*
* If the destination address is not acceptable, NAK with what we
* want to use.
*/
*dec->nakend++ = TY_IPADDR;
*dec->nakend++ = 6;
for (n = 0; n < iface->in_addrs; n++)
if ((iface->in_addr[n].brd.s_addr & ipcp->cfg.peer_range.mask.s_addr)
== (ipcp->cfg.peer_range.ipaddr.s_addr &
ipcp->cfg.peer_range.mask.s_addr)) {
/* We prefer the already-configured address */
memcpy(dec->nakend, &iface->in_addr[n].brd.s_addr, 4);
break;
}
if (n == iface->in_addrs)
memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
dec->nakend += 4;
return;
}
ipcp->peer_ip = ip;
*dec->ackend++ = TY_IPADDR;
*dec->ackend++ = 6;
memcpy(dec->ackend, &ip.s_addr, 4);
dec->ackend += 4;
}
static void
IpcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type,
struct fsm_decode *dec)
{
/* Deal with incoming PROTO_IPCP */
struct ipcp *ipcp = fsm2ipcp(fp);
int type, length, gotdnsnak;
u_int32_t compproto;
struct compreq *pcomp;
struct in_addr ipaddr, dstipaddr, have_ip;
char tbuff[100], tbuff2[100];
gotdnsnak = 0;
while (plen >= sizeof(struct fsmconfig)) {
type = *cp;
length = cp[1];
if (length == 0) {
log_Printf(LogIPCP, "%s: IPCP size zero\n", fp->link->name);
break;
}
snprintf(tbuff, sizeof tbuff, " %s[%d] ", protoname(type), length);
switch (type) {
case TY_IPADDR: /* RFC1332 */
memcpy(&ipaddr.s_addr, cp + 2, 4);
log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode_type) {
case MODE_REQ:
ipcp->peer_req = 1;
ipcp_ValidateReq(ipcp, ipaddr, dec);
break;
case MODE_NAK:
if (AcceptableAddr(&ipcp->cfg.my_range, ipaddr)) {
/* Use address suggested by peer */
snprintf(tbuff2, sizeof tbuff2, "%s changing address: %s ", tbuff,
inet_ntoa(ipcp->my_ip));
log_Printf(LogIPCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
ipcp->my_ip = ipaddr;
bundle_AdjustFilters(fp->bundle, &ipcp->my_ip, NULL);
} else {
log_Printf(log_IsKept(LogIPCP) ? LogIPCP : LogPHASE,
"%s: Unacceptable address!\n", inet_ntoa(ipaddr));
fsm_Close(&ipcp->fsm);
}
break;
case MODE_REJ:
ipcp->peer_reject |= (1 << type);
break;
}
break;
case TY_COMPPROTO:
pcomp = (struct compreq *)(cp + 2);
compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
pcomp->compcid;
log_Printf(LogIPCP, "%s %s\n", tbuff, vj2asc(compproto));
switch (mode_type) {
case MODE_REQ:
if (!IsAccepted(ipcp->cfg.vj.neg)) {
memcpy(dec->rejend, cp, length);
dec->rejend += length;
} else {
switch (length) {
case 4: /* RFC1172 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
log_Printf(LogWARN, "Peer is speaking RFC1172 compression "
"protocol !\n");
ipcp->heis1172 = 1;
ipcp->peer_compproto = compproto;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
} else {
memcpy(dec->nakend, cp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
memcpy(dec->nakend+2, &pcomp, 2);
dec->nakend += length;
}
break;
case 6: /* RFC1332 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
if (pcomp->slots <= MAX_VJ_STATES
&& pcomp->slots >= MIN_VJ_STATES) {
/* Ok, we can do that */
ipcp->peer_compproto = compproto;
ipcp->heis1172 = 0;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
} else {
/* Get as close as we can to what he wants */
ipcp->heis1172 = 0;
memcpy(dec->nakend, cp, 2);
pcomp->slots = pcomp->slots < MIN_VJ_STATES ?
MIN_VJ_STATES : MAX_VJ_STATES;
memcpy(dec->nakend+2, &pcomp, sizeof pcomp);
dec->nakend += length;
}
} else {
/* What we really want */
memcpy(dec->nakend, cp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
pcomp->slots = DEF_VJ_STATES;
pcomp->compcid = 1;
memcpy(dec->nakend+2, &pcomp, sizeof pcomp);
dec->nakend += length;
}
break;
default:
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
}
}
break;
case MODE_NAK:
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
if (pcomp->slots > MAX_VJ_STATES)
pcomp->slots = MAX_VJ_STATES;
else if (pcomp->slots < MIN_VJ_STATES)
pcomp->slots = MIN_VJ_STATES;
compproto = (ntohs(pcomp->proto) << 16) + (pcomp->slots << 8) +
pcomp->compcid;
} else
compproto = 0;
log_Printf(LogIPCP, "%s changing compproto: %08x --> %08x\n",
tbuff, ipcp->my_compproto, compproto);
ipcp->my_compproto = compproto;
break;
case MODE_REJ:
ipcp->peer_reject |= (1 << type);
break;
}
break;
case TY_IPADDRS: /* RFC1172 */
memcpy(&ipaddr.s_addr, cp + 2, 4);
memcpy(&dstipaddr.s_addr, cp + 6, 4);
snprintf(tbuff2, sizeof tbuff2, "%s %s,", tbuff, inet_ntoa(ipaddr));
log_Printf(LogIPCP, "%s %s\n", tbuff2, inet_ntoa(dstipaddr));
switch (mode_type) {
case MODE_REQ:
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
case MODE_NAK:
case MODE_REJ:
break;
}
break;
case TY_PRIMARY_DNS: /* DNS negotiation (rfc1877) */
case TY_SECONDARY_DNS:
memcpy(&ipaddr.s_addr, cp + 2, 4);
log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode_type) {
case MODE_REQ:
if (!IsAccepted(ipcp->cfg.ns.dns_neg)) {
ipcp->my_reject |= (1 << (type - TY_ADJUST_NS));
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
}
have_ip = ipcp->dns[type == TY_PRIMARY_DNS ? 0 : 1];
if (type == TY_PRIMARY_DNS && ipaddr.s_addr != have_ip.s_addr &&
ipaddr.s_addr == ipcp->dns[1].s_addr) {
/* Swap 'em 'round */
ipcp->dns[0] = ipcp->dns[1];
ipcp->dns[1] = have_ip;
have_ip = ipcp->dns[0];
}
if (ipaddr.s_addr != have_ip.s_addr) {
/*
* The client has got the DNS stuff wrong (first request) so
* we'll tell 'em how it is
*/
memcpy(dec->nakend, cp, 2); /* copy first two (type/length) */
memcpy(dec->nakend + 2, &have_ip.s_addr, length - 2);
dec->nakend += length;
} else {
/*
* Otherwise they have it right (this time) so we send a ack packet
* back confirming it... end of story
*/
memcpy(dec->ackend, cp, length);
dec->ackend += length;
}
break;
case MODE_NAK:
if (IsEnabled(ipcp->cfg.ns.dns_neg)) {
gotdnsnak = 1;
memcpy(&ipcp->dns[type == TY_PRIMARY_DNS ? 0 : 1].s_addr, cp + 2, 4);
}
break;
case MODE_REJ: /* Can't do much, stop asking */
ipcp->peer_reject |= (1 << (type - TY_ADJUST_NS));
break;
}
break;
case TY_PRIMARY_NBNS: /* M$ NetBIOS nameserver hack (rfc1877) */
case TY_SECONDARY_NBNS:
memcpy(&ipaddr.s_addr, cp + 2, 4);
log_Printf(LogIPCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode_type) {
case MODE_REQ:
have_ip.s_addr =
ipcp->cfg.ns.nbns[type == TY_PRIMARY_NBNS ? 0 : 1].s_addr;
if (have_ip.s_addr == INADDR_ANY) {
log_Printf(LogIPCP, "NBNS REQ - rejected - nbns not set\n");
ipcp->my_reject |= (1 << (type - TY_ADJUST_NS));
memcpy(dec->rejend, cp, length);
dec->rejend += length;
break;
}
if (ipaddr.s_addr != have_ip.s_addr) {
memcpy(dec->nakend, cp, 2);
memcpy(dec->nakend+2, &have_ip.s_addr, length);
dec->nakend += length;
} else {
memcpy(dec->ackend, cp, length);
dec->ackend += length;
}
break;
case MODE_NAK:
log_Printf(LogIPCP, "MS NBNS req %d - NAK??\n", type);
break;
case MODE_REJ:
log_Printf(LogIPCP, "MS NBNS req %d - REJ??\n", type);
break;
}
break;
default:
if (mode_type != MODE_NOP) {
ipcp->my_reject |= (1 << type);
memcpy(dec->rejend, cp, length);
dec->rejend += length;
}
break;
}
plen -= length;
cp += length;
}
if (gotdnsnak) {
memcpy(ipcp->ns.dns, ipcp->dns, sizeof ipcp->ns.dns);
if (ipcp->ns.writable) {
log_Printf(LogDEBUG, "Updating resolver\n");
if (!ipcp_WriteDNS(ipcp)) {
ipcp->peer_reject |= (1 << (TY_PRIMARY_DNS - TY_ADJUST_NS));
ipcp->peer_reject |= (1 << (TY_SECONDARY_DNS - TY_ADJUST_NS));
} else
bundle_AdjustDNS(fp->bundle, ipcp->dns);
} else {
log_Printf(LogDEBUG, "Not updating resolver (readonly)\n");
bundle_AdjustDNS(fp->bundle, ipcp->dns);
}
}
if (mode_type != MODE_NOP) {
if (mode_type == MODE_REQ && !ipcp->peer_req) {
if (dec->rejend == dec->rej && dec->nakend == dec->nak) {
/*
* Pretend the peer has requested an IP.
* We do this to ensure that we only send one NAK if the only
* reason for the NAK is because the peer isn't sending a
* TY_IPADDR REQ. This stops us from repeatedly trying to tell
* the peer that we have to have an IP address on their end.
*/
ipcp->peer_req = 1;
}
ipaddr.s_addr = INADDR_ANY;
ipcp_ValidateReq(ipcp, ipaddr, dec);
}
if (dec->rejend != dec->rej) {
/* rejects are preferred */
dec->ackend = dec->ack;
dec->nakend = dec->nak;
} else if (dec->nakend != dec->nak)
/* then NAKs */
dec->ackend = dec->ack;
}
}
extern struct mbuf *
ipcp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
{
/* Got PROTO_IPCP from link */
m_settype(bp, MB_IPCPIN);
if (bundle_Phase(bundle) == PHASE_NETWORK)
fsm_Input(&bundle->ncp.ipcp.fsm, bp);
else {
if (bundle_Phase(bundle) < PHASE_NETWORK)
log_Printf(LogIPCP, "%s: Error: Unexpected IPCP in phase %s (ignored)\n",
l->name, bundle_PhaseName(bundle));
m_freem(bp);
}
return NULL;
}
int
ipcp_UseHisIPaddr(struct bundle *bundle, struct in_addr hisaddr)
{
struct ipcp *ipcp = &bundle->ncp.ipcp;
memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
iplist_reset(&ipcp->cfg.peer_list);
ipcp->peer_ip = ipcp->cfg.peer_range.ipaddr = hisaddr;
ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST;
ipcp->cfg.peer_range.width = 32;
if (ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr, hisaddr, 0) < 0)
return 0;
return 1; /* Ok */
}
int
ipcp_UseHisaddr(struct bundle *bundle, const char *hisaddr, int setaddr)
{
struct ipcp *ipcp = &bundle->ncp.ipcp;
/* Use `hisaddr' for the peers address (set iface if `setaddr') */
memset(&ipcp->cfg.peer_range, '\0', sizeof ipcp->cfg.peer_range);
iplist_reset(&ipcp->cfg.peer_list);
if (strpbrk(hisaddr, ",-")) {
iplist_setsrc(&ipcp->cfg.peer_list, hisaddr);
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
iplist_setrandpos(&ipcp->cfg.peer_list);
ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->my_ip);
if (ipcp->peer_ip.s_addr == INADDR_ANY) {
log_Printf(LogWARN, "%s: None available !\n", ipcp->cfg.peer_list.src);
return 0;
}
ipcp->cfg.peer_range.ipaddr.s_addr = ipcp->peer_ip.s_addr;
ipcp->cfg.peer_range.mask.s_addr = INADDR_BROADCAST;
ipcp->cfg.peer_range.width = 32;
} else {
log_Printf(LogWARN, "%s: Invalid range !\n", hisaddr);
return 0;
}
} else if (ParseAddr(ipcp, hisaddr, &ipcp->cfg.peer_range.ipaddr,
&ipcp->cfg.peer_range.mask,
&ipcp->cfg.peer_range.width) != 0) {
ipcp->peer_ip.s_addr = ipcp->cfg.peer_range.ipaddr.s_addr;
if (setaddr && ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr,
ipcp->cfg.peer_range.ipaddr, 0) < 0)
return 0;
} else
return 0;
bundle_AdjustFilters(bundle, NULL, &ipcp->peer_ip);
return 1; /* Ok */
}
struct in_addr
addr2mask(struct in_addr addr)
{
u_int32_t haddr = ntohl(addr.s_addr);
haddr = IN_CLASSA(haddr) ? IN_CLASSA_NET :
IN_CLASSB(haddr) ? IN_CLASSB_NET :
IN_CLASSC_NET;
addr.s_addr = htonl(haddr);
return addr;
}
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