package/ppp/patches/105-debian_demand.patch

   1 diff -Naur ppp-2.4.4.orig/pppd/demand.c ppp-2.4.4/pppd/demand.c
   2 --- ppp-2.4.4.orig/pppd/demand.c        2005-08-25 08:14:18.000000000 -0400
   3 +++ ppp-2.4.4/pppd/demand.c     2009-05-07 16:16:20.000000000 -0400
   4 @@ -36,6 +36,8 @@
   5  #include <errno.h>
   6  #include <fcntl.h>
   7  #include <netdb.h>
   8 +#include <unistd.h>
   9 +#include <syslog.h>
  10  #include <sys/param.h>
  11  #include <sys/types.h>
  12  #include <sys/wait.h>
  13 @@ -43,6 +45,8 @@
  14  #include <sys/resource.h>
  15  #include <sys/stat.h>
  16  #include <sys/socket.h>
  17 +#include <netinet/in.h>
  18 +#include <arpa/inet.h>
  19  #ifdef PPP_FILTER
  20  #include <pcap-bpf.h>
  21  #endif
  22 @@ -221,6 +225,14 @@
  23      int c, rv;
  24
  25      rv = 0;
  26 +
  27 +/* check for synchronous connection... */
  28 +
  29 +    if ( (p[0] == 0xFF) && (p[1] == 0x03) ) {
  30 +        rv = loop_frame(p,n);
  31 +        return rv;
  32 +    }
  33 +
  34      for (; n > 0; --n) {
  35         c = *p++;
  36         if (c == PPP_FLAG) {
  37 @@ -299,17 +311,102 @@
  38   * loopback, now that the real serial link is up.
  39   */
  40  void
  41 -demand_rexmit(proto)
  42 +demand_rexmit(proto, newip)
  43      int proto;
  44 +    u_int32_t newip;
  45  {
  46      struct packet *pkt, *prev, *nextpkt;
  47 +    unsigned short checksum;
  48 +    unsigned short pkt_checksum = 0;
  49 +    unsigned iphdr;
  50 +    struct timeval tv;
  51 +    char cv = 0;
  52 +    char ipstr[16];
  53
  54      prev = NULL;
  55      pkt = pend_q;
  56      pend_q = NULL;
  57 +    tv.tv_sec = 1;
  58 +    tv.tv_usec = 0;
  59 +    select(0,NULL,NULL,NULL,&tv);      /* Sleep for 1 Seconds */
  60      for (; pkt != NULL; pkt = nextpkt) {
  61         nextpkt = pkt->next;
  62         if (PPP_PROTOCOL(pkt->data) == proto) {
  63 +            if ( (proto == PPP_IP) && newip ) {
  64 +               /* Get old checksum */
  65 +
  66 +               iphdr = (pkt->data[4] & 15) << 2;
  67 +               checksum = *((unsigned short *) (pkt->data+14));
  68 +                if (checksum == 0xFFFF) {
  69 +                    checksum = 0;
  70 +                }
  71 +
  72 +
  73 +                if (pkt->data[13] == 17) {
  74 +                    pkt_checksum =  *((unsigned short *) (pkt->data+10+iphdr));
  75 +                   if (pkt_checksum) {
  76 +                        cv = 1;
  77 +                        if (pkt_checksum == 0xFFFF) {
  78 +                            pkt_checksum = 0;
  79 +                        }
  80 +                    }
  81 +                    else {
  82 +                       cv = 0;
  83 +                    }
  84 +                }
  85 +
  86 +               if (pkt->data[13] == 6) {
  87 +                   pkt_checksum = *((unsigned short *) (pkt->data+20+iphdr));
  88 +                   cv = 1;
  89 +                    if (pkt_checksum == 0xFFFF) {
  90 +                        pkt_checksum = 0;
  91 +                    }
  92 +               }
  93 +
  94 +               /* Delete old Source-IP-Address */
  95 +                checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
  96 +                checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
  97 +
  98 +               pkt_checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
  99 +               pkt_checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
 100 +
 101 +               /* Change Source-IP-Address */
 102 +                * ((u_int32_t *) (pkt->data + 16)) = newip;
 103 +
 104 +               /* Add new Source-IP-Address */
 105 +                checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
 106 +                checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
 107 +
 108 +                pkt_checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
 109 +                pkt_checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
 110 +
 111 +               /* Write new checksum */
 112 +                if (!checksum) {
 113 +                    checksum = 0xFFFF;
 114 +                }
 115 +                *((unsigned short *) (pkt->data+14)) = checksum;
 116 +               if (pkt->data[13] == 6) {
 117 +                   *((unsigned short *) (pkt->data+20+iphdr)) = pkt_checksum;
 118 +               }
 119 +               if (cv && (pkt->data[13] == 17) ) {
 120 +                   *((unsigned short *) (pkt->data+10+iphdr)) = pkt_checksum;
 121 +               }
 122 +
 123 +               /* Log Packet */
 124 +               strcpy(ipstr,inet_ntoa(*( (struct in_addr *) (pkt->data+16))));
 125 +               if (pkt->data[13] == 1) {
 126 +                   syslog(LOG_INFO,"Open ICMP %s -> %s\n",
 127 +                       ipstr,
 128 +                       inet_ntoa(*( (struct in_addr *) (pkt->data+20))));
 129 +               } else {
 130 +                   syslog(LOG_INFO,"Open %s %s:%d -> %s:%d\n",
 131 +                       pkt->data[13] == 6 ? "TCP" : "UDP",
 132 +                       ipstr,
 133 +                       ntohs(*( (short *) (pkt->data+iphdr+4))),
 134 +                       inet_ntoa(*( (struct in_addr *) (pkt->data+20))),
 135 +                       ntohs(*( (short *) (pkt->data+iphdr+6))));
 136 +                }
 137 +            }
 138             output(0, pkt->data, pkt->length);
 139             free(pkt);
 140         } else {
 141 diff -Naur ppp-2.4.4.orig/pppd/ipcp.c ppp-2.4.4/pppd/ipcp.c
 142 --- ppp-2.4.4.orig/pppd/ipcp.c  2009-05-07 15:49:34.000000000 -0400
 143 +++ ppp-2.4.4/pppd/ipcp.c       2009-05-07 16:16:20.000000000 -0400
 144 @@ -1776,7 +1776,7 @@
 145                     proxy_arp_set[f->unit] = 1;
 146
 147         }
 148 -       demand_rexmit(PPP_IP);
 149 +       demand_rexmit(PPP_IP,go->ouraddr);
 150         sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
 151
 152      } else {
 153 diff -Naur ppp-2.4.4.orig/pppd/ipv6cp.c ppp-2.4.4/pppd/ipv6cp.c
 154 --- ppp-2.4.4.orig/pppd/ipv6cp.c        2005-08-25 19:59:34.000000000 -0400
 155 +++ ppp-2.4.4/pppd/ipv6cp.c     2009-05-07 16:16:20.000000000 -0400
 156 @@ -1232,7 +1232,7 @@
 157             }
 158
 159         }
 160 -       demand_rexmit(PPP_IPV6);
 161 +       demand_rexmit(PPP_IPV6,0);
 162         sifnpmode(f->unit, PPP_IPV6, NPMODE_PASS);
 163
 164      } else {
 165 diff -Naur ppp-2.4.4.orig/pppd/pppd.h ppp-2.4.4/pppd/pppd.h
 166 --- ppp-2.4.4.orig/pppd/pppd.h  2009-05-07 15:49:34.000000000 -0400
 167 +++ ppp-2.4.4/pppd/pppd.h       2009-05-07 16:16:20.000000000 -0400
 168 @@ -565,7 +565,7 @@
 169  void demand_block __P((void)); /* set all NPs to queue up packets */
 170  void demand_unblock __P((void)); /* set all NPs to pass packets */
 171  void demand_discard __P((void)); /* set all NPs to discard packets */
 172 -void demand_rexmit __P((int)); /* retransmit saved frames for an NP */
 173 +void demand_rexmit __P((int, u_int32_t)); /* retransmit saved frames for an NP*/
 174  int  loop_chars __P((unsigned char *, int)); /* process chars from loopback */
 175  int  loop_frame __P((unsigned char *, int)); /* should we bring link up? */
 176