#include <string.h>
#include <termios.h>
#include <sys/stat.h>
+#include <sys/time.h>
#include <arpa/inet.h>
#include <glib.h>
#include "gatppp.h"
#include "ppp.h"
+#define PPPINITFCS16 0xffff /* Initial FCS value */
+#define PPPGOODFCS16 0xf0b8 /* Good final FCS value */
+
+struct frame_buffer {
+ gsize len;
+ guint8 bytes[0];
+};
+
+static GList *packet_handlers = NULL;
+
+void ppp_register_packet_handler(struct ppp_packet_handler *handler)
+{
+ packet_handlers = g_list_append(packet_handlers, handler);
+}
+
+/*
+ * FCS lookup table copied from rfc1662.
+ */
+static guint16 fcstab[256] = {
+ 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
+ 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
+ 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
+ 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
+ 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
+ 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
+ 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
+ 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
+ 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
+ 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
+ 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
+ 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
+ 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
+ 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
+ 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
+ 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
+ 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
+ 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
+ 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
+ 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
+ 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
+ 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
+ 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
+ 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
+ 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
+ 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
+ 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
+ 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
+ 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
+ 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
+ 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
+ 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
+};
+
+/*
+ * Calculate a new fcs given the current fcs and the new data.
+ * copied from rfc1662
+ *
+ * The FCS field is calculated over all bits of the Address, Control,
+ * Protocol, Information and Padding fields, not including any start
+ * and stop bits (asynchronous) nor any bits (synchronous) or octets
+ * (asynchronous or synchronous) inserted for transparency. This
+ * also does not include the Flag Sequences nor the FCS field itself.
+ */
+static guint16 ppp_fcs(guint16 fcs, guint8 c)
+{
+ guint16 new_fcs;
+
+ new_fcs = (fcs >> 8) ^ fcstab[(fcs ^ c) & 0xff];
+ return new_fcs;
+}
+
+/*
+ * escape any chars less than 0x20, and check the transmit accm table to
+ * see if this character should be escaped.
+ */
+static gboolean ppp_escape(GAtPPP *ppp, guint8 c, gboolean lcp)
+{
+ if ((lcp && c < 0x20) || (ppp->xmit_accm[c >> 5] & (1 << (c & 0x1f))))
+ return TRUE;
+ return FALSE;
+}
+
+static void ppp_put(GAtPPP *ppp, guint8 *buf, int *pos,
+ guint8 c, gboolean lcp)
+{
+ int i = *pos;
+
+ /* escape characters if needed, copy into buf, increment pos */
+ if (ppp_escape(ppp, c, lcp)) {
+ buf[i++] = PPP_ESC;
+ buf[i++] = c ^ 0x20;
+ } else
+ buf[i++] = c;
+ *pos = i;
+}
+
+/* XXX implement PFC and ACFC */
+static guint8 *ppp_encode(GAtPPP *ppp, guint8 *data, int len,
+ guint *newlen)
+{
+ int pos = 0;
+ int i = 0;
+ guint16 fcs = PPPINITFCS16;
+ guint16 proto = get_host_short(data);
+ gboolean lcp = (proto == LCP_PROTOCOL);
+ guint8 *frame = g_try_malloc0(BUFFERSZ);
+ if (!frame)
+ return NULL;
+
+ /* copy in the HDLC framing */
+ frame[pos++] = PPP_FLAG_SEQ;
+
+ /* from here till end flag, calculate FCS over each character */
+ fcs = ppp_fcs(fcs, PPP_ADDR_FIELD);
+ ppp_put(ppp, frame, &pos, PPP_ADDR_FIELD, lcp);
+ fcs = ppp_fcs(fcs, PPP_CTRL);
+ ppp_put(ppp, frame, &pos, PPP_CTRL, lcp);
+
+ /*
+ * for each byte, first calculate FCS, then do escaping if
+ * neccessary
+ */
+ while (len--) {
+ fcs = ppp_fcs(fcs, data[i]);
+ ppp_put(ppp, frame, &pos, data[i++], lcp);
+ }
+
+ /* add FCS */
+ fcs ^= 0xffff; /* complement */
+ ppp_put(ppp, frame, &pos, (guint8)(fcs & 0x00ff), lcp);
+ ppp_put(ppp, frame, &pos, (guint8)((fcs >> 8) & 0x00ff), lcp);
+
+ /* add flag */
+ frame[pos++] = PPP_FLAG_SEQ;
+
+ *newlen = pos;
+ return frame;
+}
+
+static gint is_proto_handler(gconstpointer a, gconstpointer b)
+{
+ const struct ppp_packet_handler *h = a;
+ const guint16 proto = (guint16) GPOINTER_TO_UINT(b);
+
+ if (h->proto == proto)
+ return 0;
+ else
+ return -1;
+}
+
+/* called when we have received a complete ppp frame */
+static void ppp_recv(GAtPPP *ppp, struct frame_buffer *frame)
+{
+ guint protocol = ppp_proto(frame->bytes);
+ guint8 *packet = ppp_info(frame->bytes);
+ struct ppp_packet_handler *h;
+ GList *list;
+
+ if (!frame)
+ return;
+
+ /*
+ * check to see if we have a protocol handler
+ * registered for this packet
+ */
+ list = g_list_find_custom(packet_handlers,
+ GUINT_TO_POINTER(protocol), is_proto_handler);
+ if (list) {
+ h = list->data;
+ h->handler(h->priv, packet);
+ } else
+ lcp_protocol_reject(ppp->lcp, frame->bytes, frame->len);
+
+ g_free(frame);
+}
+
+/* XXX - Implement PFC and ACFC */
+static struct frame_buffer *ppp_decode(GAtPPP *ppp, guint8 *frame)
+{
+ guint8 *data;
+ guint pos;
+ int i;
+ guint16 fcs;
+ struct frame_buffer *fb;
+
+ fb = g_try_malloc0(sizeof(struct frame_buffer) + ppp->mru + 10);
+ if (!fb)
+ return NULL;
+ data = fb->bytes;
+
+ /* skip the first flag char */
+ pos = 1;
+
+ fcs = PPPINITFCS16;
+ i = 0;
+
+ /* TBD - how to deal with recv_accm */
+ while (frame[pos] != PPP_FLAG_SEQ) {
+ /* scan for escape character */
+ if (frame[pos] == PPP_ESC) {
+ /* skip that char */
+ pos++;
+ data[i] = frame[pos] ^ 0x20;
+ } else
+ data[i] = frame[pos];
+
+ fcs = ppp_fcs(fcs, data[i]);
+
+ i++; pos++;
+ }
+
+ fb->len = i;
+
+ /* see if we have a good FCS */
+ if (fcs != PPPGOODFCS16) {
+ g_free(fb);
+ return NULL;
+ }
+
+ return fb;
+}
+
+static void ppp_feed(GAtPPP *ppp, guint8 *data, gsize len)
+{
+ guint pos = 0;
+ struct frame_buffer *frame;
+
+ /* collect bytes until we detect we have received a complete frame */
+ /* examine the data. If we are at the beginning of a new frame,
+ * allocate memory to buffer the frame.
+ */
+
+ for (pos = 0; pos < len; pos++) {
+ if (data[pos] == PPP_FLAG_SEQ) {
+ if (ppp->index != 0) {
+ /* store last flag character & decode */
+ ppp->buffer[ppp->index++] = data[pos];
+ frame = ppp_decode(ppp, ppp->buffer);
+
+ /* process receive frame */
+ ppp_recv(ppp, frame);
+
+ /* zero buffer */
+ memset(ppp->buffer, 0, BUFFERSZ);
+ ppp->index = 0;
+ continue;
+ }
+ }
+ /* copy byte to buffer */
+ if (ppp->index < BUFFERSZ)
+ ppp->buffer[ppp->index++] = data[pos];
+ }
+}
+
+static void ppp_record(GAtPPP *ppp, gboolean in, guint8 *data, guint16 length)
+{
+ guint16 len = htons(length);
+ guint32 ts;
+ struct timeval now;
+ unsigned char id;
+ int err;
+
+ if (ppp->record_fd < 0)
+ return;
+
+ gettimeofday(&now, NULL);
+ ts = htonl(now.tv_sec & 0xffffffff);
+
+ id = 0x07;
+ err = write(ppp->record_fd, &id, 1);
+ err = write(ppp->record_fd, &ts, 4);
+
+ id = in ? 0x02 : 0x01;
+ err = write(ppp->record_fd, &id, 1);
+ err = write(ppp->record_fd, &len, 2);
+ err = write(ppp->record_fd, data, length);
+}
+
+/*
+ * 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)
+{
+ guint8 *frame;
+ guint framelen;
+ GError *error = NULL;
+ GIOStatus status;
+ gsize bytes_written;
+
+ /*
+ * do the octet stuffing. Add 2 bytes to the infolen to
+ * include the protocol field.
+ */
+ frame = ppp_encode(ppp, packet, infolen + 2, &framelen);
+ if (!frame) {
+ g_printerr("Failed to encode packet to transmit\n");
+ return;
+ }
+
+ /* transmit through the lower layer interface */
+ /*
+ * TBD - should we just put this on a queue and transmit when
+ * we won't block, or allow ourselves to block here?
+ */
+ status = g_io_channel_write_chars(ppp->modem, (gchar *) frame,
+ framelen, &bytes_written, &error);
+ ppp_record(ppp, FALSE, frame, bytes_written);
+
+ g_free(frame);
+}
+
+gboolean ppp_cb(GIOChannel *channel, GIOCondition cond, gpointer data)
+{
+ GAtPPP *ppp = data;
+ GIOStatus status;
+ gchar buf[256];
+ gsize bytes_read;
+ GError *error = NULL;
+
+ if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP))
+ return FALSE;
+
+ if (cond & G_IO_IN) {
+ status = g_io_channel_read_chars(channel, buf, 256,
+ &bytes_read, &error);
+ if (bytes_read > 0) {
+ ppp_record(ppp, TRUE, (guint8 *) buf, bytes_read);
+ ppp_feed(ppp, (guint8 *) buf, bytes_read);
+ }
+ if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/* Administrative Close */
+void ppp_close(GAtPPP *ppp)
+{
+ /* send a CLOSE event to the lcp layer */
+ lcp_close(ppp->lcp);
+}
+
+static void ppp_link_establishment(GAtPPP *ppp)
+{
+ /* signal UP event to LCP */
+ lcp_establish(ppp->lcp);
+}
+
+static void ppp_terminate(GAtPPP *ppp)
+{
+ /* signal DOWN event to LCP */
+ lcp_terminate(ppp->lcp);
+}
+
+static void ppp_authenticate(GAtPPP *ppp)
+{
+ /* we don't do authentication right now, so send NONE */
+ if (!ppp->auth_proto)
+ ppp_generate_event(ppp, PPP_NONE);
+ /* otherwise we need to wait for the peer to send us a challenge */
+}
+
+static void ppp_dead(GAtPPP *ppp)
+{
+ /* notify interested parties */
+ if (ppp->disconnect_cb)
+ ppp->disconnect_cb(ppp->disconnect_data);
+
+ if (g_atomic_int_get(&ppp->ref_count))
+ return;
+
+ /* cleanup modem channel */
+ g_source_remove(ppp->modem_watch);
+ g_io_channel_unref(ppp->modem);
+
+ /* remove lcp */
+ lcp_free(ppp->lcp);
+
+ /* remove auth */
+ auth_free(ppp->auth);
+
+ g_free(ppp);
+}
+
+static void ppp_network(GAtPPP *ppp)
+{
+ /* bring network phase up */
+ ppp_net_open(ppp->net);
+}
+
+static void ppp_transition_phase(GAtPPP *ppp, enum ppp_phase phase)
+{
+ /* don't do anything if we're already there */
+ if (ppp->phase == phase)
+ return;
+
+ /* set new phase */
+ ppp->phase = phase;
+
+ switch (phase) {
+ case PPP_ESTABLISHMENT:
+ ppp_link_establishment(ppp);
+ break;
+ case PPP_AUTHENTICATION:
+ ppp_authenticate(ppp);
+ break;
+ case PPP_TERMINATION:
+ ppp_terminate(ppp);
+ break;
+ case PPP_DEAD:
+ ppp_dead(ppp);
+ break;
+ case PPP_NETWORK:
+ ppp_network(ppp);
+ break;
+ }
+}
+
+/*
+ * send the event handler a new event to process
+ */
+void ppp_generate_event(GAtPPP *ppp, enum ppp_event event)
+{
+ switch (event) {
+ case PPP_UP:
+ /* causes transition to ppp establishment */
+ ppp_transition_phase(ppp, PPP_ESTABLISHMENT);
+ break;
+ case PPP_OPENED:
+ ppp_transition_phase(ppp, PPP_AUTHENTICATION);
+ break;
+ case PPP_CLOSING:
+ /* causes transition to termination phase */
+ ppp_transition_phase(ppp, PPP_TERMINATION);
+ break;
+ case PPP_DOWN:
+ /* cases transition to dead phase */
+ ppp_transition_phase(ppp, PPP_DEAD);
+ break;
+ case PPP_NONE:
+ case PPP_SUCCESS:
+ /* causes transition to network phase */
+ ppp_transition_phase(ppp, PPP_NETWORK);
+ break;
+ case PPP_FAIL:
+ if (ppp->phase == PPP_ESTABLISHMENT)
+ ppp_transition_phase(ppp, PPP_DEAD);
+ else if (ppp->phase == PPP_AUTHENTICATION)
+ ppp_transition_phase(ppp, PPP_TERMINATION);
+ }
+}
+
+void ppp_set_auth(GAtPPP *ppp, guint8* auth_data)
+{
+ guint16 proto = get_host_short(auth_data);
+
+ switch (proto) {
+ case CHAP_PROTOCOL:
+ /* get the algorithm */
+ auth_set_proto(ppp->auth, proto, auth_data[2]);
+ break;
+ default:
+ g_printerr("unknown authentication proto\n");
+ break;
+ }
+}
+
+void ppp_set_recv_accm(GAtPPP *ppp, guint32 accm)
+{
+ ppp->recv_accm = accm;
+}
+
+guint32 ppp_get_xmit_accm(GAtPPP *ppp)
+{
+ return ppp->xmit_accm[0];
+}
+
+void ppp_set_pfc(GAtPPP *ppp, gboolean pfc)
+{
+ ppp->pfc = pfc;
+}
+
+gboolean ppp_get_pfc(GAtPPP *ppp)
+{
+ return ppp->pfc;
+}
+
+void ppp_set_acfc(GAtPPP *ppp, gboolean acfc)
+{
+ ppp->acfc = acfc;
+}
+
+gboolean ppp_get_acfc(GAtPPP *ppp)
+{
+ return ppp->acfc;
+}
+
/* Administrative Open */
void g_at_ppp_open(GAtPPP *ppp)
{
+++ /dev/null
-/*
- *
- * PPP library with GLib integration
- *
- * Copyright (C) 2009-2010 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/time.h>
-#include <arpa/inet.h>
-
-#include <glib.h>
-
-#include "gatutil.h"
-#include "gatppp.h"
-#include "ppp.h"
-
-#define PPPINITFCS16 0xffff /* Initial FCS value */
-#define PPPGOODFCS16 0xf0b8 /* Good final FCS value */
-
-struct frame_buffer {
- gsize len;
- guint8 bytes[0];
-};
-
-static GList *packet_handlers = NULL;
-
-void ppp_register_packet_handler(struct ppp_packet_handler *handler)
-{
- packet_handlers = g_list_append(packet_handlers, handler);
-}
-
-/*
- * FCS lookup table copied from rfc1662.
- */
-static guint16 fcstab[256] = {
- 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
- 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
- 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
- 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
- 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
- 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
- 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
- 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
- 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
- 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
- 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
- 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
- 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
- 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
- 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
- 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
- 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
- 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
- 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
- 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
- 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
- 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
- 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
- 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
- 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
- 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
- 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
- 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
- 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
- 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
- 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
- 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
-};
-
-/*
- * Calculate a new fcs given the current fcs and the new data.
- * copied from rfc1662
- *
- * The FCS field is calculated over all bits of the Address, Control,
- * Protocol, Information and Padding fields, not including any start
- * and stop bits (asynchronous) nor any bits (synchronous) or octets
- * (asynchronous or synchronous) inserted for transparency. This
- * also does not include the Flag Sequences nor the FCS field itself.
- */
-static guint16 ppp_fcs(guint16 fcs, guint8 c)
-{
- guint16 new_fcs;
-
- new_fcs = (fcs >> 8) ^ fcstab[(fcs ^ c) & 0xff];
- return new_fcs;
-}
-
-/*
- * escape any chars less than 0x20, and check the transmit accm table to
- * see if this character should be escaped.
- */
-static gboolean ppp_escape(GAtPPP *ppp, guint8 c, gboolean lcp)
-{
- if ((lcp && c < 0x20) || (ppp->xmit_accm[c >> 5] & (1 << (c & 0x1f))))
- return TRUE;
- return FALSE;
-}
-
-static void ppp_put(GAtPPP *ppp, guint8 *buf, int *pos,
- guint8 c, gboolean lcp)
-{
- int i = *pos;
-
- /* escape characters if needed, copy into buf, increment pos */
- if (ppp_escape(ppp, c, lcp)) {
- buf[i++] = PPP_ESC;
- buf[i++] = c ^ 0x20;
- } else
- buf[i++] = c;
- *pos = i;
-}
-
-/* XXX implement PFC and ACFC */
-static guint8 *ppp_encode(GAtPPP *ppp, guint8 *data, int len,
- guint *newlen)
-{
- int pos = 0;
- int i = 0;
- guint16 fcs = PPPINITFCS16;
- guint16 proto = get_host_short(data);
- gboolean lcp = (proto == LCP_PROTOCOL);
- guint8 *frame = g_try_malloc0(BUFFERSZ);
- if (!frame)
- return NULL;
-
- /* copy in the HDLC framing */
- frame[pos++] = PPP_FLAG_SEQ;
-
- /* from here till end flag, calculate FCS over each character */
- fcs = ppp_fcs(fcs, PPP_ADDR_FIELD);
- ppp_put(ppp, frame, &pos, PPP_ADDR_FIELD, lcp);
- fcs = ppp_fcs(fcs, PPP_CTRL);
- ppp_put(ppp, frame, &pos, PPP_CTRL, lcp);
-
- /*
- * for each byte, first calculate FCS, then do escaping if
- * neccessary
- */
- while (len--) {
- fcs = ppp_fcs(fcs, data[i]);
- ppp_put(ppp, frame, &pos, data[i++], lcp);
- }
-
- /* add FCS */
- fcs ^= 0xffff; /* complement */
- ppp_put(ppp, frame, &pos, (guint8)(fcs & 0x00ff), lcp);
- ppp_put(ppp, frame, &pos, (guint8)((fcs >> 8) & 0x00ff), lcp);
-
- /* add flag */
- frame[pos++] = PPP_FLAG_SEQ;
-
- *newlen = pos;
- return frame;
-}
-
-static gint is_proto_handler(gconstpointer a, gconstpointer b)
-{
- const struct ppp_packet_handler *h = a;
- const guint16 proto = (guint16) GPOINTER_TO_UINT(b);
-
- if (h->proto == proto)
- return 0;
- else
- return -1;
-}
-
-/* called when we have received a complete ppp frame */
-static void ppp_recv(GAtPPP *ppp, struct frame_buffer *frame)
-{
- guint protocol = ppp_proto(frame->bytes);
- guint8 *packet = ppp_info(frame->bytes);
- struct ppp_packet_handler *h;
- GList *list;
-
- if (!frame)
- return;
-
- /*
- * check to see if we have a protocol handler
- * registered for this packet
- */
- list = g_list_find_custom(packet_handlers,
- GUINT_TO_POINTER(protocol), is_proto_handler);
- if (list) {
- h = list->data;
- h->handler(h->priv, packet);
- } else
- lcp_protocol_reject(ppp->lcp, frame->bytes, frame->len);
-
- g_free(frame);
-}
-
-/* XXX - Implement PFC and ACFC */
-static struct frame_buffer *ppp_decode(GAtPPP *ppp, guint8 *frame)
-{
- guint8 *data;
- guint pos;
- int i;
- guint16 fcs;
- struct frame_buffer *fb;
-
- fb = g_try_malloc0(sizeof(struct frame_buffer) + ppp->mru + 10);
- if (!fb)
- return NULL;
- data = fb->bytes;
-
- /* skip the first flag char */
- pos = 1;
-
- fcs = PPPINITFCS16;
- i = 0;
-
- /* TBD - how to deal with recv_accm */
- while (frame[pos] != PPP_FLAG_SEQ) {
- /* scan for escape character */
- if (frame[pos] == PPP_ESC) {
- /* skip that char */
- pos++;
- data[i] = frame[pos] ^ 0x20;
- } else
- data[i] = frame[pos];
-
- fcs = ppp_fcs(fcs, data[i]);
-
- i++; pos++;
- }
-
- fb->len = i;
-
- /* see if we have a good FCS */
- if (fcs != PPPGOODFCS16) {
- g_free(fb);
- return NULL;
- }
-
- return fb;
-}
-
-static void ppp_feed(GAtPPP *ppp, guint8 *data, gsize len)
-{
- guint pos = 0;
- struct frame_buffer *frame;
-
- /* collect bytes until we detect we have received a complete frame */
- /* examine the data. If we are at the beginning of a new frame,
- * allocate memory to buffer the frame.
- */
-
- for (pos = 0; pos < len; pos++) {
- if (data[pos] == PPP_FLAG_SEQ) {
- if (ppp->index != 0) {
- /* store last flag character & decode */
- ppp->buffer[ppp->index++] = data[pos];
- frame = ppp_decode(ppp, ppp->buffer);
-
- /* process receive frame */
- ppp_recv(ppp, frame);
-
- /* zero buffer */
- memset(ppp->buffer, 0, BUFFERSZ);
- ppp->index = 0;
- continue;
- }
- }
- /* copy byte to buffer */
- if (ppp->index < BUFFERSZ)
- ppp->buffer[ppp->index++] = data[pos];
- }
-}
-
-static void ppp_record(GAtPPP *ppp, gboolean in, guint8 *data, guint16 length)
-{
- guint16 len = htons(length);
- guint32 ts;
- struct timeval now;
- unsigned char id;
- int err;
-
- if (ppp->record_fd < 0)
- return;
-
- gettimeofday(&now, NULL);
- ts = htonl(now.tv_sec & 0xffffffff);
-
- id = 0x07;
- err = write(ppp->record_fd, &id, 1);
- err = write(ppp->record_fd, &ts, 4);
-
- id = in ? 0x02 : 0x01;
- err = write(ppp->record_fd, &id, 1);
- err = write(ppp->record_fd, &len, 2);
- err = write(ppp->record_fd, data, length);
-}
-
-/*
- * 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)
-{
- guint8 *frame;
- guint framelen;
- GError *error = NULL;
- GIOStatus status;
- gsize bytes_written;
-
- /*
- * do the octet stuffing. Add 2 bytes to the infolen to
- * include the protocol field.
- */
- frame = ppp_encode(ppp, packet, infolen + 2, &framelen);
- if (!frame) {
- g_printerr("Failed to encode packet to transmit\n");
- return;
- }
-
- /* transmit through the lower layer interface */
- /*
- * TBD - should we just put this on a queue and transmit when
- * we won't block, or allow ourselves to block here?
- */
- status = g_io_channel_write_chars(ppp->modem, (gchar *) frame,
- framelen, &bytes_written, &error);
- ppp_record(ppp, FALSE, frame, bytes_written);
-
- g_free(frame);
-}
-
-gboolean ppp_cb(GIOChannel *channel, GIOCondition cond, gpointer data)
-{
- GAtPPP *ppp = data;
- GIOStatus status;
- gchar buf[256];
- gsize bytes_read;
- GError *error = NULL;
-
- if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP))
- return FALSE;
-
- if (cond & G_IO_IN) {
- status = g_io_channel_read_chars(channel, buf, 256,
- &bytes_read, &error);
- if (bytes_read > 0) {
- ppp_record(ppp, TRUE, (guint8 *) buf, bytes_read);
- ppp_feed(ppp, (guint8 *) buf, bytes_read);
- }
- if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
- return FALSE;
- }
-
- return TRUE;
-}
-
-/* Administrative Close */
-void ppp_close(GAtPPP *ppp)
-{
- /* send a CLOSE event to the lcp layer */
- lcp_close(ppp->lcp);
-}
-
-static void ppp_link_establishment(GAtPPP *ppp)
-{
- /* signal UP event to LCP */
- lcp_establish(ppp->lcp);
-}
-
-static void ppp_terminate(GAtPPP *ppp)
-{
- /* signal DOWN event to LCP */
- lcp_terminate(ppp->lcp);
-}
-
-static void ppp_authenticate(GAtPPP *ppp)
-{
- /* we don't do authentication right now, so send NONE */
- if (!ppp->auth_proto)
- ppp_generate_event(ppp, PPP_NONE);
- /* otherwise we need to wait for the peer to send us a challenge */
-}
-
-static void ppp_dead(GAtPPP *ppp)
-{
- /* notify interested parties */
- if (ppp->disconnect_cb)
- ppp->disconnect_cb(ppp->disconnect_data);
-
- if (g_atomic_int_get(&ppp->ref_count))
- return;
-
- /* cleanup modem channel */
- g_source_remove(ppp->modem_watch);
- g_io_channel_unref(ppp->modem);
-
- /* remove lcp */
- lcp_free(ppp->lcp);
-
- /* remove auth */
- auth_free(ppp->auth);
-
- g_free(ppp);
-}
-
-static void ppp_network(GAtPPP *ppp)
-{
- /* bring network phase up */
- ppp_net_open(ppp->net);
-}
-
-static void ppp_transition_phase(GAtPPP *ppp, enum ppp_phase phase)
-{
- /* don't do anything if we're already there */
- if (ppp->phase == phase)
- return;
-
- /* set new phase */
- ppp->phase = phase;
-
- switch (phase) {
- case PPP_ESTABLISHMENT:
- ppp_link_establishment(ppp);
- break;
- case PPP_AUTHENTICATION:
- ppp_authenticate(ppp);
- break;
- case PPP_TERMINATION:
- ppp_terminate(ppp);
- break;
- case PPP_DEAD:
- ppp_dead(ppp);
- break;
- case PPP_NETWORK:
- ppp_network(ppp);
- break;
- }
-}
-
-/*
- * send the event handler a new event to process
- */
-void ppp_generate_event(GAtPPP *ppp, enum ppp_event event)
-{
- switch (event) {
- case PPP_UP:
- /* causes transition to ppp establishment */
- ppp_transition_phase(ppp, PPP_ESTABLISHMENT);
- break;
- case PPP_OPENED:
- ppp_transition_phase(ppp, PPP_AUTHENTICATION);
- break;
- case PPP_CLOSING:
- /* causes transition to termination phase */
- ppp_transition_phase(ppp, PPP_TERMINATION);
- break;
- case PPP_DOWN:
- /* cases transition to dead phase */
- ppp_transition_phase(ppp, PPP_DEAD);
- break;
- case PPP_NONE:
- case PPP_SUCCESS:
- /* causes transition to network phase */
- ppp_transition_phase(ppp, PPP_NETWORK);
- break;
- case PPP_FAIL:
- if (ppp->phase == PPP_ESTABLISHMENT)
- ppp_transition_phase(ppp, PPP_DEAD);
- else if (ppp->phase == PPP_AUTHENTICATION)
- ppp_transition_phase(ppp, PPP_TERMINATION);
- }
-}
-
-void ppp_set_auth(GAtPPP *ppp, guint8* auth_data)
-{
- guint16 proto = get_host_short(auth_data);
-
- switch (proto) {
- case CHAP_PROTOCOL:
- /* get the algorithm */
- auth_set_proto(ppp->auth, proto, auth_data[2]);
- break;
- default:
- g_printerr("unknown authentication proto\n");
- break;
- }
-}
-
-void ppp_set_recv_accm(GAtPPP *ppp, guint32 accm)
-{
- ppp->recv_accm = accm;
-}
-
-guint32 ppp_get_xmit_accm(GAtPPP *ppp)
-{
- return ppp->xmit_accm[0];
-}
-
-void ppp_set_pfc(GAtPPP *ppp, gboolean pfc)
-{
- ppp->pfc = pfc;
-}
-
-gboolean ppp_get_pfc(GAtPPP *ppp)
-{
- return ppp->pfc;
-}
-
-void ppp_set_acfc(GAtPPP *ppp, gboolean acfc)
-{
- ppp->acfc = acfc;
-}
-
-gboolean ppp_get_acfc(GAtPPP *ppp)
-{
- return ppp->acfc;
-}
projects / platform / upstream / ofono.git / commitdiff