mirror of git://git.sysmocom.de/ofono
Move functions from ppp.c into gatppp.c
This commit is contained in:
Marcel Holtmann
parent
7d6649680f
commit
6607b5985e
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@ -57,7 +57,7 @@ gatchat_sources = gatchat/gatchat.h gatchat/gatchat.c \
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gatchat/gat.h \
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gatchat/gatserver.h gatchat/gatserver.c \
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gatchat/gatppp.c gatchat/gatppp.h \
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gatchat/ppp.c gatchat/ppp.h gatchat/ppp_cp.h \
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gatchat/ppp.h gatchat/ppp_cp.h \
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gatchat/ppp_cp.c gatchat/ppp_lcp.c \
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gatchat/ppp_auth.c gatchat/ppp_net.c
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501
gatchat/gatppp.c
501
gatchat/gatppp.c
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@ -29,6 +29,7 @@
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#include <string.h>
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#include <termios.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <arpa/inet.h>
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#include <glib.h>
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@ -37,6 +38,506 @@
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#include "gatppp.h"
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#include "ppp.h"
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#define PPPINITFCS16 0xffff /* Initial FCS value */
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#define PPPGOODFCS16 0xf0b8 /* Good final FCS value */
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struct frame_buffer {
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gsize len;
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guint8 bytes[0];
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};
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static GList *packet_handlers = NULL;
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void ppp_register_packet_handler(struct ppp_packet_handler *handler)
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{
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packet_handlers = g_list_append(packet_handlers, handler);
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}
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/*
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* FCS lookup table copied from rfc1662.
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*/
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static guint16 fcstab[256] = {
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0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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};
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/*
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* Calculate a new fcs given the current fcs and the new data.
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* copied from rfc1662
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*
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* The FCS field is calculated over all bits of the Address, Control,
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* Protocol, Information and Padding fields, not including any start
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* and stop bits (asynchronous) nor any bits (synchronous) or octets
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* (asynchronous or synchronous) inserted for transparency. This
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* also does not include the Flag Sequences nor the FCS field itself.
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*/
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static guint16 ppp_fcs(guint16 fcs, guint8 c)
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{
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guint16 new_fcs;
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new_fcs = (fcs >> 8) ^ fcstab[(fcs ^ c) & 0xff];
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return new_fcs;
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}
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/*
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* escape any chars less than 0x20, and check the transmit accm table to
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* see if this character should be escaped.
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*/
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static gboolean ppp_escape(GAtPPP *ppp, guint8 c, gboolean lcp)
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{
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if ((lcp && c < 0x20) || (ppp->xmit_accm[c >> 5] & (1 << (c & 0x1f))))
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return TRUE;
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return FALSE;
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}
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static void ppp_put(GAtPPP *ppp, guint8 *buf, int *pos,
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guint8 c, gboolean lcp)
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{
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int i = *pos;
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/* escape characters if needed, copy into buf, increment pos */
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if (ppp_escape(ppp, c, lcp)) {
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buf[i++] = PPP_ESC;
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buf[i++] = c ^ 0x20;
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} else
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buf[i++] = c;
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*pos = i;
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}
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/* XXX implement PFC and ACFC */
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static guint8 *ppp_encode(GAtPPP *ppp, guint8 *data, int len,
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guint *newlen)
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{
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int pos = 0;
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int i = 0;
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guint16 fcs = PPPINITFCS16;
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guint16 proto = get_host_short(data);
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gboolean lcp = (proto == LCP_PROTOCOL);
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guint8 *frame = g_try_malloc0(BUFFERSZ);
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if (!frame)
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return NULL;
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/* copy in the HDLC framing */
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frame[pos++] = PPP_FLAG_SEQ;
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/* from here till end flag, calculate FCS over each character */
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fcs = ppp_fcs(fcs, PPP_ADDR_FIELD);
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ppp_put(ppp, frame, &pos, PPP_ADDR_FIELD, lcp);
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fcs = ppp_fcs(fcs, PPP_CTRL);
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ppp_put(ppp, frame, &pos, PPP_CTRL, lcp);
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/*
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* for each byte, first calculate FCS, then do escaping if
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* neccessary
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*/
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while (len--) {
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fcs = ppp_fcs(fcs, data[i]);
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ppp_put(ppp, frame, &pos, data[i++], lcp);
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}
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/* add FCS */
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fcs ^= 0xffff; /* complement */
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ppp_put(ppp, frame, &pos, (guint8)(fcs & 0x00ff), lcp);
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ppp_put(ppp, frame, &pos, (guint8)((fcs >> 8) & 0x00ff), lcp);
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/* add flag */
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frame[pos++] = PPP_FLAG_SEQ;
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*newlen = pos;
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return frame;
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}
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static gint is_proto_handler(gconstpointer a, gconstpointer b)
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{
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const struct ppp_packet_handler *h = a;
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const guint16 proto = (guint16) GPOINTER_TO_UINT(b);
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if (h->proto == proto)
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return 0;
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else
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return -1;
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}
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/* called when we have received a complete ppp frame */
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static void ppp_recv(GAtPPP *ppp, struct frame_buffer *frame)
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{
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guint protocol = ppp_proto(frame->bytes);
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guint8 *packet = ppp_info(frame->bytes);
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struct ppp_packet_handler *h;
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GList *list;
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if (!frame)
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return;
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/*
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* check to see if we have a protocol handler
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* registered for this packet
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*/
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list = g_list_find_custom(packet_handlers,
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GUINT_TO_POINTER(protocol), is_proto_handler);
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if (list) {
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h = list->data;
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h->handler(h->priv, packet);
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} else
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lcp_protocol_reject(ppp->lcp, frame->bytes, frame->len);
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g_free(frame);
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}
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/* XXX - Implement PFC and ACFC */
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static struct frame_buffer *ppp_decode(GAtPPP *ppp, guint8 *frame)
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{
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guint8 *data;
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guint pos;
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int i;
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guint16 fcs;
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struct frame_buffer *fb;
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fb = g_try_malloc0(sizeof(struct frame_buffer) + ppp->mru + 10);
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if (!fb)
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return NULL;
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data = fb->bytes;
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/* skip the first flag char */
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pos = 1;
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fcs = PPPINITFCS16;
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i = 0;
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/* TBD - how to deal with recv_accm */
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while (frame[pos] != PPP_FLAG_SEQ) {
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/* scan for escape character */
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if (frame[pos] == PPP_ESC) {
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/* skip that char */
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pos++;
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data[i] = frame[pos] ^ 0x20;
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} else
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data[i] = frame[pos];
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fcs = ppp_fcs(fcs, data[i]);
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i++; pos++;
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}
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fb->len = i;
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/* see if we have a good FCS */
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if (fcs != PPPGOODFCS16) {
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g_free(fb);
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return NULL;
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}
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return fb;
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}
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static void ppp_feed(GAtPPP *ppp, guint8 *data, gsize len)
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{
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guint pos = 0;
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struct frame_buffer *frame;
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/* collect bytes until we detect we have received a complete frame */
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/* examine the data. If we are at the beginning of a new frame,
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* allocate memory to buffer the frame.
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*/
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for (pos = 0; pos < len; pos++) {
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if (data[pos] == PPP_FLAG_SEQ) {
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if (ppp->index != 0) {
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/* store last flag character & decode */
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ppp->buffer[ppp->index++] = data[pos];
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frame = ppp_decode(ppp, ppp->buffer);
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/* process receive frame */
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ppp_recv(ppp, frame);
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/* zero buffer */
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memset(ppp->buffer, 0, BUFFERSZ);
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ppp->index = 0;
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continue;
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}
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}
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/* copy byte to buffer */
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if (ppp->index < BUFFERSZ)
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ppp->buffer[ppp->index++] = data[pos];
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}
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}
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static void ppp_record(GAtPPP *ppp, gboolean in, guint8 *data, guint16 length)
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{
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guint16 len = htons(length);
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guint32 ts;
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struct timeval now;
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unsigned char id;
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int err;
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if (ppp->record_fd < 0)
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return;
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gettimeofday(&now, NULL);
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ts = htonl(now.tv_sec & 0xffffffff);
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id = 0x07;
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err = write(ppp->record_fd, &id, 1);
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err = write(ppp->record_fd, &ts, 4);
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id = in ? 0x02 : 0x01;
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err = write(ppp->record_fd, &id, 1);
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err = write(ppp->record_fd, &len, 2);
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err = write(ppp->record_fd, data, length);
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}
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/*
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* transmit out through the lower layer interface
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*
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* infolen - length of the information part of the packet
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*/
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void ppp_transmit(GAtPPP *ppp, guint8 *packet, guint infolen)
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{
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guint8 *frame;
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guint framelen;
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GError *error = NULL;
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GIOStatus status;
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gsize bytes_written;
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/*
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* do the octet stuffing. Add 2 bytes to the infolen to
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* include the protocol field.
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*/
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frame = ppp_encode(ppp, packet, infolen + 2, &framelen);
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if (!frame) {
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g_printerr("Failed to encode packet to transmit\n");
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return;
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}
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/* transmit through the lower layer interface */
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/*
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* TBD - should we just put this on a queue and transmit when
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* we won't block, or allow ourselves to block here?
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*/
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status = g_io_channel_write_chars(ppp->modem, (gchar *) frame,
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framelen, &bytes_written, &error);
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ppp_record(ppp, FALSE, frame, bytes_written);
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g_free(frame);
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}
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gboolean ppp_cb(GIOChannel *channel, GIOCondition cond, gpointer data)
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{
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GAtPPP *ppp = data;
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GIOStatus status;
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gchar buf[256];
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gsize bytes_read;
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GError *error = NULL;
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if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP))
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return FALSE;
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if (cond & G_IO_IN) {
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status = g_io_channel_read_chars(channel, buf, 256,
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&bytes_read, &error);
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if (bytes_read > 0) {
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ppp_record(ppp, TRUE, (guint8 *) buf, bytes_read);
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ppp_feed(ppp, (guint8 *) buf, bytes_read);
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}
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if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
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return FALSE;
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}
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return TRUE;
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}
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/* Administrative Close */
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void ppp_close(GAtPPP *ppp)
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{
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/* send a CLOSE event to the lcp layer */
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lcp_close(ppp->lcp);
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}
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static void ppp_link_establishment(GAtPPP *ppp)
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{
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/* signal UP event to LCP */
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lcp_establish(ppp->lcp);
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}
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static void ppp_terminate(GAtPPP *ppp)
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{
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/* signal DOWN event to LCP */
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lcp_terminate(ppp->lcp);
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}
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static void ppp_authenticate(GAtPPP *ppp)
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{
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/* we don't do authentication right now, so send NONE */
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if (!ppp->auth_proto)
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ppp_generate_event(ppp, PPP_NONE);
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/* otherwise we need to wait for the peer to send us a challenge */
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}
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static void ppp_dead(GAtPPP *ppp)
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{
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/* notify interested parties */
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if (ppp->disconnect_cb)
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ppp->disconnect_cb(ppp->disconnect_data);
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if (g_atomic_int_get(&ppp->ref_count))
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return;
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/* cleanup modem channel */
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g_source_remove(ppp->modem_watch);
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g_io_channel_unref(ppp->modem);
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/* remove lcp */
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lcp_free(ppp->lcp);
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/* remove auth */
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auth_free(ppp->auth);
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g_free(ppp);
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}
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static void ppp_network(GAtPPP *ppp)
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{
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/* bring network phase up */
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ppp_net_open(ppp->net);
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}
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static void ppp_transition_phase(GAtPPP *ppp, enum ppp_phase phase)
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{
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/* don't do anything if we're already there */
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if (ppp->phase == phase)
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return;
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/* set new phase */
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ppp->phase = phase;
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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)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -29,6 +29,7 @@ extern "C" {
|
|||
#include "gat.h"
|
||||
|
||||
struct _GAtPPP;
|
||||
|
||||
typedef struct _GAtPPP GAtPPP;
|
||||
|
||||
typedef enum _GAtPPPConnectStatus {
|
||||
|
|
|
|||
538
gatchat/ppp.c
538
gatchat/ppp.c
|
|
@ -1,538 +0,0 @@
|
|||
/*
|
||||
*
|
||||
* 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;
|
||||
}
|
||||
Loading…
Reference in New Issue