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/*
*
* PPP library with GLib integration
*
* Copyright (C) 2009-2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <termios.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <arpa/inet.h>

#include <glib.h>

#include "gatutil.h"
#include "gathdlc.h"
#include "gatppp.h"
#include "crc-ccitt.h"
#include "ppp.h"

#define DEFAULT_MRU 1500
#define DEFAULT_MTU 1500

#define PPP_ADDR_FIELD 0xff
#define PPP_CTRL 0x03

#define GUARD_TIMEOUTS 1500

enum ppp_phase {
PPP_PHASE_DEAD = 0, /* Link dead */
PPP_PHASE_ESTABLISHMENT, /* LCP started */
PPP_PHASE_AUTHENTICATION, /* Auth started */
PPP_PHASE_NETWORK, /* IPCP started */
PPP_PHASE_LINK_UP, /* IPCP negotiation ok, link up */
PPP_PHASE_TERMINATION, /* LCP Terminate phase */
};

struct _GAtPPP {
gint ref_count;
enum ppp_phase phase;
struct pppcp_data *lcp;
struct pppcp_data *ipcp;
struct ppp_net *net;
struct ppp_chap *chap;
GAtHDLC *hdlc;
gint mru;
gint mtu;
char username[256];
char password[256];
GAtPPPConnectFunc connect_cb;
gpointer connect_data;
GAtPPPDisconnectFunc disconnect_cb;
gpointer disconnect_data;
GAtPPPDisconnectReason disconnect_reason;
GAtDebugFunc debugf;
gpointer debug_data;
gboolean sta_pending;
guint ppp_dead_source;
GAtSuspendFunc suspend_func;
gpointer suspend_data;
int fd;
guint guard_timeout_source;
gboolean suspended;
gboolean xmit_acfc;
gboolean xmit_pfc;
};

void ppp_debug(GAtPPP *ppp, const char *str)
{
if (ppp == NULL || ppp->debugf == NULL)
return;

ppp->debugf(str, ppp->debug_data);
}

static gboolean ppp_dead(gpointer userdata)
{
GAtPPP *ppp = userdata;

DBG(ppp, "");

ppp->ppp_dead_source = 0;

/* notify interested parties */
if (ppp->disconnect_cb)
ppp->disconnect_cb(ppp->disconnect_reason,
ppp->disconnect_data);

return FALSE;
}

static void sta_sent(gpointer userdata)
{
GAtPPP *ppp = userdata;

DBG(ppp, "");

ppp->sta_pending = FALSE;

if (ppp->phase == PPP_PHASE_DEAD)
ppp_dead(ppp);
}

struct ppp_header *ppp_packet_new(gsize infolen, guint16 protocol)
{
struct ppp_header *ppp_packet;

ppp_packet = g_try_malloc0(infolen + sizeof(*ppp_packet));
if (ppp_packet == NULL)
return NULL;

ppp_packet->proto = htons(protocol);
ppp_packet->address = PPP_ADDR_FIELD;
ppp_packet->control = PPP_CTRL;

return ppp_packet;
}

/*
* Silently discard packets which are received when they shouldn't be
*/
static inline gboolean ppp_drop_packet(GAtPPP *ppp, guint16 protocol)
{
switch (ppp->phase) {
case PPP_PHASE_ESTABLISHMENT:
case PPP_PHASE_TERMINATION:
if (protocol != LCP_PROTOCOL)
return TRUE;
break;
case PPP_PHASE_AUTHENTICATION:
if (protocol != LCP_PROTOCOL && protocol != CHAP_PROTOCOL)
return TRUE;
break;
case PPP_PHASE_DEAD:
return TRUE;
case PPP_PHASE_NETWORK:
if (protocol != LCP_PROTOCOL && protocol != CHAP_PROTOCOL &&
protocol != IPCP_PROTO)
return TRUE;
break;
case PPP_PHASE_LINK_UP:
break;
}

return FALSE;
}

static void ppp_receive(const unsigned char *buf, gsize len, void *data)
{
GAtPPP *ppp = data;
unsigned int offset = 0;
guint16 protocol;
const guint8 *packet;

if (len == 0)
return;

if (buf[0] == PPP_ADDR_FIELD && len >= 2 && buf[1] == PPP_CTRL)
offset = 2;

if (len < offset + 1)
return;

/* From RFC 1661:
* the Protocol field uses an extension mechanism consistent with the
* ISO 3309 extension mechanism for the Address field; the Least
* Significant Bit (LSB) of each octet is used to indicate extension
* of the Protocol field. A binary "0" as the LSB indicates that the
* Protocol field continues with the following octet. The presence
* of a binary "1" as the LSB marks the last octet of the Protocol
* field.
*
* To check for compression we simply check the LSB of the first
* protocol byte.
*/

if (buf[offset] & 0x1) {
protocol = buf[offset];
offset += 1;
} else {
if (len < offset + 2)
return;

protocol = get_host_short(buf + offset);
offset += 2;
}

if (ppp_drop_packet(ppp, protocol))
return;

packet = buf + offset;

switch (protocol) {
case PPP_IP_PROTO:
ppp_net_process_packet(ppp->net, packet, len - offset);
break;
case LCP_PROTOCOL:
pppcp_process_packet(ppp->lcp, packet, len - offset);
break;
case IPCP_PROTO:
pppcp_process_packet(ppp->ipcp, packet, len - offset);
break;
case CHAP_PROTOCOL:
if (ppp->chap) {
ppp_chap_process_packet(ppp->chap, packet,
len - offset);
break;
}
/* fall through */
default:
pppcp_send_protocol_reject(ppp->lcp, buf, len);
break;
};
}

static void ppp_send_lcp_frame(GAtPPP *ppp, guint8 *packet, guint infolen)
{
struct ppp_header *header = (struct ppp_header *) packet;
guint8 code;
guint32 xmit_accm = 0;
gboolean sta = FALSE;
gboolean lcp;

/*
* all LCP Link Configuration, Link Termination, and Code-Reject
* packets must be sent with the default sending ACCM
*/
code = pppcp_get_code(packet);
lcp = code > 0 && code < 8;

/*
* If we're going down, we try to make sure to send the final
* ack before informing the upper layers via the ppp_disconnect
* function. Once we enter PPP_DEAD phase, no further packets
* will be sent
*/
if (code == PPPCP_CODE_TYPE_TERMINATE_ACK)
sta = TRUE;

if (lcp) {
xmit_accm = g_at_hdlc_get_xmit_accm(ppp->hdlc);
g_at_hdlc_set_xmit_accm(ppp->hdlc, ~0U);
}

header->address = PPP_ADDR_FIELD;
header->control = PPP_CTRL;

if (g_at_hdlc_send(ppp->hdlc, packet,
infolen + sizeof(*header)) == TRUE) {
if (sta) {
GAtIO *io = g_at_hdlc_get_io(ppp->hdlc);

ppp->sta_pending = TRUE;
g_at_io_set_write_done(io, sta_sent, ppp);
}
} else
DBG(ppp, "Failed to send a frame\n");

if (lcp)
g_at_hdlc_set_xmit_accm(ppp->hdlc, xmit_accm);
}

static void ppp_send_acfc_frame(GAtPPP *ppp, guint8 *packet,
guint infolen)
{
struct ppp_header *header = (struct ppp_header *) packet;
guint offset = 0;

if (ppp->xmit_acfc)
offset = 2;

/* We remove the only address and control field */
if (g_at_hdlc_send(ppp->hdlc, packet + offset,
infolen + sizeof(*header) - offset)
== FALSE)
DBG(ppp, "Failed to send a frame\n");
}

static void ppp_send_acfc_pfc_frame(GAtPPP *ppp, guint8 *packet,
guint infolen)
{
struct ppp_header *header = (struct ppp_header *) packet;
guint offset = 0;

if (ppp->xmit_acfc && ppp->xmit_pfc)
offset = 3;
else if (ppp->xmit_acfc)
offset = 2;
else if (ppp->xmit_pfc) {
/* Shuffle AC bytes in place of the first protocol byte */
packet[2] = packet[1];
packet[1] = packet[0];
offset = 1;
}

if (g_at_hdlc_send(ppp->hdlc, packet + offset,
infolen + sizeof(*header) - offset)
== FALSE)
DBG(ppp, "Failed to send a frame\n");
}

/*
* transmit out through the lower layer interface
*
* infolen - length of the information part of the packet
*/
void ppp_transmit(GAtPPP *ppp, guint8 *packet, guint infolen)
{
guint16 proto = ppp_proto(packet);

if (proto == LCP_PROTOCOL) {
ppp_send_lcp_frame(ppp, packet, infolen);
return;
}

/*
* If the upper 8 bits of the protocol are 0, then send
* with PFC if enabled
*/
if ((proto & 0xff00) == 0)
ppp_send_acfc_pfc_frame(ppp, packet, infolen);
else
ppp_send_acfc_frame(ppp, packet, infolen);
}

static inline void ppp_enter_phase(GAtPPP *ppp, enum ppp_phase phase)
{
DBG(ppp, "%d", phase);
ppp->phase = phase;

if (phase == PPP_PHASE_DEAD && ppp->sta_pending == FALSE)
ppp->ppp_dead_source = g_idle_add(ppp_dead, ppp);
}

void ppp_set_auth(GAtPPP *ppp, const guint8* auth_data)
{
guint16 proto = get_host_short(auth_data);

switch (proto) {
case CHAP_PROTOCOL:
if (ppp->chap)
ppp_chap_free(ppp->chap);

ppp->chap = ppp_chap_new(ppp, auth_data[2]);
break;
default:
DBG(ppp, "unknown authentication proto");
break;
}
}

void ppp_auth_notify(GAtPPP *ppp, gboolean success)
{
if (success == FALSE) {
ppp->disconnect_reason = G_AT_PPP_REASON_AUTH_FAIL;
pppcp_signal_close(ppp->lcp);
return;
}

ppp_enter_phase(ppp, PPP_PHASE_NETWORK);

/* Send UP & OPEN events to the IPCP layer */
pppcp_signal_open(ppp->ipcp);
pppcp_signal_up(ppp->ipcp);
}

void ppp_ipcp_up_notify(GAtPPP *ppp, const char *local, const char *peer,
const char *dns1, const char *dns2)
{
ppp->net = ppp_net_new(ppp, ppp->fd);

/*
* ppp_net_new took control over the fd, whatever happens is out of
* our hands now
*/
ppp->fd = -1;

if (ppp->net == NULL) {
ppp->disconnect_reason = G_AT_PPP_REASON_NET_FAIL;
pppcp_signal_close(ppp->lcp);
return;
}

if (ppp_net_set_mtu(ppp->net, ppp->mtu) == FALSE)
DBG(ppp, "Unable to set MTU");

ppp_enter_phase(ppp, PPP_PHASE_LINK_UP);

if (ppp->connect_cb)
ppp->connect_cb(ppp_net_get_interface(ppp->net),
local, peer, dns1, dns2,
ppp->connect_data);
}

void ppp_ipcp_down_notify(GAtPPP *ppp)
{
/* Most likely we failed to create the interface */
if (ppp->net == NULL)
return;

ppp_net_free(ppp->net);
ppp->net = NULL;
}

void ppp_ipcp_finished_notify(GAtPPP *ppp)
{
if (ppp->phase != PPP_PHASE_NETWORK)
return;

/* Our IPCP parameter negotiation failed */
ppp->disconnect_reason = G_AT_PPP_REASON_IPCP_FAIL;
pppcp_signal_close(ppp->ipcp);
pppcp_signal_close(ppp->lcp);
}

void ppp_lcp_up_notify(GAtPPP *ppp)
{
/* Wait for the peer to send us a challenge if we expect auth */
if (ppp->chap != NULL) {
ppp_enter_phase(ppp, PPP_PHASE_AUTHENTICATION);
return;
}

/* Otherwise proceed as if auth succeeded */
ppp_auth_notify(ppp, TRUE);
}

void ppp_lcp_down_notify(GAtPPP *ppp)
{
if (ppp->phase == PPP_PHASE_NETWORK || ppp->phase == PPP_PHASE_LINK_UP)
pppcp_signal_down(ppp->ipcp);

if (ppp->disconnect_reason == G_AT_PPP_REASON_UNKNOWN)
ppp->disconnect_reason = G_AT_PPP_REASON_PEER_CLOSED;

ppp_enter_phase(ppp, PPP_PHASE_TERMINATION);
}

void ppp_lcp_finished_notify(GAtPPP *ppp)
{
ppp_enter_phase(ppp, PPP_PHASE_DEAD);
}

void ppp_set_recv_accm(GAtPPP *ppp, guint32 accm)
{
g_at_hdlc_set_recv_accm(ppp->hdlc, accm);
}

void ppp_set_xmit_accm(GAtPPP *ppp, guint32 accm)
{
g_at_hdlc_set_xmit_accm(ppp->hdlc, accm);
}

/*
* The only time we use other than default MTU is when we are in
* the network phase.
*/
void ppp_set_mtu(GAtPPP *ppp, const guint8 *data)
{
guint16 mtu = get_host_short(data);

ppp->mtu = mtu;
}

void ppp_set_xmit_acfc(GAtPPP *ppp, gboolean acfc)
{
ppp->xmit_acfc = acfc;
}

void ppp_set_xmit_pfc(GAtPPP *ppp, gboolean pfc)
{
ppp->xmit_pfc = pfc;
}

static void io_disconnect(gpointer user_data)
{
GAtPPP *ppp = user_data;

if (ppp->phase == PPP_PHASE_DEAD)
return;

ppp->disconnect_reason = G_AT_PPP_REASON_LINK_DEAD;
pppcp_signal_down(ppp->lcp);
pppcp_signal_close(ppp->lcp);
}

static void ppp_proxy_suspend_net_interface(gpointer user_data)
{
GAtPPP *ppp = user_data;

ppp->suspended = TRUE;
ppp_net_suspend_interface(ppp->net);

if (ppp->suspend_func)
ppp->suspend_func(ppp->suspend_data);
}

gboolean g_at_ppp_listen(GAtPPP *ppp, GAtIO *io)
{
ppp->hdlc = g_at_hdlc_new_from_io(io);
if (ppp->hdlc == NULL)
return FALSE;

ppp->suspended = FALSE;
g_at_hdlc_set_receive(ppp->hdlc, ppp_receive, ppp);
g_at_hdlc_set_suspend_function(ppp->hdlc,
ppp_proxy_suspend_net_interface, ppp);
g_at_io_set_disconnect_function(io, io_disconnect, ppp);

ppp_enter_phase(ppp, PPP_PHASE_ESTABLISHMENT);

return TRUE;
}

/* Administrative Open */
gboolean g_at_ppp_open(GAtPPP *ppp, GAtIO *io)
{
ppp->hdlc = g_at_hdlc_new_from_io(io);
if (ppp->hdlc == NULL)
return FALSE;

ppp->suspended = FALSE;
g_at_hdlc_set_receive(ppp->hdlc, ppp_receive, ppp);
g_at_hdlc_set_suspend_function(ppp->hdlc,
ppp_proxy_suspend_net_interface, ppp);
g_at_hdlc_set_no_carrier_detect(ppp->hdlc, TRUE);
g_at_io_set_disconnect_function(io, io_disconnect, ppp);

/* send an UP & OPEN events to the lcp layer */
pppcp_signal_up(ppp->lcp);
pppcp_signal_open(ppp->lcp);

ppp_enter_phase(ppp, PPP_PHASE_ESTABLISHMENT);

return TRUE;
}

gboolean g_at_ppp_set_credentials(GAtPPP *ppp, const char *username,
const char *password)
{
if (username && strlen(username) > 255)
return FALSE;

if (password && strlen(password) > 255)
return FALSE;

memset(ppp->username, 0, sizeof(ppp->username));
memset(ppp->password, 0, sizeof(ppp->password));

if (username)
strcpy(ppp->username, username);

if (password)
strcpy(ppp->password, password);

return TRUE;
}

const char *g_at_ppp_get_username(GAtPPP *ppp)
{
return ppp->username;
}

const char *g_at_ppp_get_password(GAtPPP *ppp)
{
return ppp->password;
}

void g_at_ppp_set_recording(GAtPPP *ppp, const char *filename)
{
if (ppp == NULL)
return;

g_at_hdlc_set_recording(ppp->hdlc, filename);
}

void g_at_ppp_set_connect_function(GAtPPP *ppp, GAtPPPConnectFunc func,
gpointer user_data)
{
if (func == NULL)
return;

ppp->connect_cb = func;
ppp->connect_data = user_data;
}

void g_at_ppp_set_disconnect_function(GAtPPP *ppp, GAtPPPDisconnectFunc func,
gpointer user_data)
{
if (func == NULL)
return;

ppp->disconnect_cb = func;
ppp->disconnect_data = user_data;
}

void g_at_ppp_set_debug(GAtPPP *ppp, GAtDebugFunc func, gpointer user_data)
{
if (ppp == NULL)
return;

ppp->debugf = func;
ppp->debug_data = user_data;
}

void g_at_ppp_set_suspend_function(GAtPPP *ppp, GAtSuspendFunc func,
gpointer user_data)
{
if (ppp == NULL)
return;

ppp->suspend_func = func;
ppp->suspend_data = user_data;

if (ppp->hdlc != NULL)
g_at_hdlc_set_suspend_function(ppp->hdlc,
ppp_proxy_suspend_net_interface, ppp);
}

void g_at_ppp_shutdown(GAtPPP *ppp)
{
if (ppp->phase == PPP_PHASE_DEAD || ppp->phase == PPP_PHASE_TERMINATION)
return;

ppp->disconnect_reason = G_AT_PPP_REASON_LOCAL_CLOSE;
pppcp_signal_close(ppp->lcp);
}

static gboolean call_suspend_cb(gpointer user_data)
{
GAtPPP *ppp = user_data;

ppp->guard_timeout_source = 0;

if (ppp->suspend_func)
ppp->suspend_func(ppp->suspend_data);

return FALSE;
}

static gboolean send_escape_sequence(gpointer user_data)
{
GAtPPP *ppp = user_data;
GAtIO *io = g_at_hdlc_get_io(ppp->hdlc);

g_at_io_write(io, "+++", 3);
ppp->guard_timeout_source = g_timeout_add(GUARD_TIMEOUTS,
call_suspend_cb, ppp);

return FALSE;
}

void g_at_ppp_suspend(GAtPPP *ppp)
{
if (ppp == NULL)
return;

ppp->suspended = TRUE;
ppp_net_suspend_interface(ppp->net);
g_at_hdlc_suspend(ppp->hdlc);
ppp->guard_timeout_source = g_timeout_add(GUARD_TIMEOUTS,
send_escape_sequence, ppp);
}

void g_at_ppp_resume(GAtPPP *ppp)
{
if (ppp == NULL)
return;

if (g_at_hdlc_get_io(ppp->hdlc) == NULL) {
io_disconnect(ppp);
return;
}

ppp->suspended = FALSE;
g_at_io_set_disconnect_function(g_at_hdlc_get_io(ppp->hdlc),
io_disconnect, ppp);
ppp_net_resume_interface(ppp->net);
g_at_hdlc_resume(ppp->hdlc);
}

void g_at_ppp_ref(GAtPPP *ppp)
{
g_atomic_int_inc(&ppp->ref_count);
}

void g_at_ppp_unref(GAtPPP *ppp)
{
gboolean is_zero;

if (ppp == NULL)
return;

is_zero = g_atomic_int_dec_and_test(&ppp->ref_count);

if (is_zero == FALSE)
return;

if (ppp->suspended == FALSE)
g_at_io_set_disconnect_function(g_at_hdlc_get_io(ppp->hdlc),
NULL, NULL);

if (ppp->net)
ppp_net_free(ppp->net);
else if (ppp->fd >= 0)
close(ppp->fd);

if (ppp->chap)
ppp_chap_free(ppp->chap);

lcp_free(ppp->lcp);
ipcp_free(ppp->ipcp);

if (ppp->ppp_dead_source) {
g_source_remove(ppp->ppp_dead_source);
ppp->ppp_dead_source = 0;
}

if (ppp->guard_timeout_source) {
g_source_remove(ppp->guard_timeout_source);
ppp->guard_timeout_source = 0;
}

g_at_hdlc_unref(ppp->hdlc);

g_free(ppp);
}

void g_at_ppp_set_server_info(GAtPPP *ppp, const char *remote,
const char *dns1, const char *dns2)
{
guint32 r = 0;
guint32 d1 = 0;
guint32 d2 = 0;

inet_pton(AF_INET, remote, &r);
inet_pton(AF_INET, dns1, &d1);
inet_pton(AF_INET, dns2, &d2);

ipcp_set_server_info(ppp->ipcp, r, d1, d2);
}

void g_at_ppp_set_acfc_enabled(GAtPPP *ppp, gboolean enabled)
{
lcp_set_acfc_enabled(ppp->lcp, enabled);
}

void g_at_ppp_set_pfc_enabled(GAtPPP *ppp, gboolean enabled)
{
lcp_set_pfc_enabled(ppp->lcp, enabled);
}

static GAtPPP *ppp_init_common(gboolean is_server, guint32 ip)
{
GAtPPP *ppp;

ppp = g_try_malloc0(sizeof(GAtPPP));
if (ppp == NULL)
return NULL;

ppp->ref_count = 1;
ppp->suspended = TRUE;
ppp->fd = -1;

/* set options to defaults */
ppp->mru = DEFAULT_MRU;
ppp->mtu = DEFAULT_MTU;

/* initialize the lcp state */
ppp->lcp = lcp_new(ppp, is_server);

/* initialize IPCP state */
ppp->ipcp = ipcp_new(ppp, is_server, ip);

return ppp;
}

GAtPPP *g_at_ppp_new(void)
{
return ppp_init_common(FALSE, 0);
}

GAtPPP *g_at_ppp_server_new_full(const char *local, int fd)
{
GAtPPP *ppp;
guint32 ip;

if (local == NULL)
ip = 0;
else if (inet_pton(AF_INET, local, &ip) != 1)
return NULL;

ppp = ppp_init_common(TRUE, ip);

if (ppp != NULL)
ppp->fd = fd;

return ppp;
}

GAtPPP *g_at_ppp_server_new(const char *local)
{
return g_at_ppp_server_new_full(local, -1);
}
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