X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/6e3d21bbdc2e1cbf4627bd2c6c9f9cbeb19bf9c7..ae52a7d8d22f9d9670f141a72c92a48013ae5e46:/ppp.c diff --git a/ppp.c b/ppp.c index af3de1d..088696b 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.10 2004/08/02 05:40:21 fred_nerk Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.16 2004/09/23 04:01:36 fred_nerk Exp $"; #include #include @@ -76,26 +76,27 @@ void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l) return; } if (session[s].ip) - *p = 2; // ACK + *p = 2; // ACK else - *p = 3; // cant authorise + *p = 3; // cant authorise p[1] = id; - *(u16 *) (p + 2) = htons(5); // length - p[4] = 0; // no message + *(u16 *) (p + 2) = htons(5); // length + p[4] = 0; // no message if (session[s].ip) { - log(3, session[s].ip, s, t, "%d Already an IP allocated: %s (%d)\n", getpid(), inet_toa(htonl(session[s].ip)), session[s].ip_pool_index); + log(3, session[s].ip, s, t, "%d Already an IP allocated: %s (%d)\n", getpid(), inet_toa(htonl(session[s].ip)), session[s].ip_pool_index); session[s].flags &= ~SF_IPCP_ACKED; } else { - log(1, 0, s, t, "No radius session available to authenticate session...\n"); + log(1, 0, s, t, "No radius session available to authenticate session...\n"); } log(3, 0, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK"); tunnelsend(b, 5 + (p - b), t); // send it } else - { // set up RADIUS request + { + // set up RADIUS request u16 r = session[s].radius; // Run PRE_AUTH plugins @@ -250,7 +251,7 @@ void dumplcp(u8 *p, int l) { case 1: // Maximum-Receive-Unit if (length == 4) - log(4, 0, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2))); + log(4, 0, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2))); else log(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length); break; @@ -258,7 +259,7 @@ void dumplcp(u8 *p, int l) { if (length == 4) { - int proto = ntohs(*(u16 *)(o + 2)); + int proto = ntohs(*(u16 *)(o + 2)); log(4, 0, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto, proto == 0xC223 ? "CHAP" : proto == 0xC023 ? "PAP" : "UNKNOWN"); @@ -277,8 +278,8 @@ void dumplcp(u8 *p, int l) { if (length == 6) { - u32 magicno = ntohl(*(u32 *)(o + 2)); - log(4, 0, 0, 0, " %s %x\n", lcp_types[type], magicno); + u32 magicno = ntohl(*(u32 *)(o + 2)); + log(4, 0, 0, 0, " %s %x\n", lcp_types[type], magicno); } else log(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length); @@ -327,6 +328,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l) } else if (*p == ConfigReq) { + l = ntohs(*(u16 *)(p + 2)); signed int x = l - 4; u8 *o = (p + 4); @@ -410,15 +412,16 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l) { // Send back a ConfigAck log(3, session[s].ip, s, t, "ConfigReq accepted, sending as Ack\n"); + // for win2k L2TP clients and LCP renegotiation of alive session + if (magicno || l == 4 || (session[s].mru && l == 8)) initlcp(t, s); q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) { + if (!q) + { log(3, session[s].ip, s, t, " failed to create packet.\n"); return; } *q = ConfigAck; tunnelsend(b, l + (q - b), t); - // For win2k L2TP clients, LCP should be initiated by the LNS - if (magicno) initlcp(t, s); } else { @@ -438,7 +441,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l) } else if (*p == TerminateReq) { - *p = TerminateAck; // close + *p = TerminateAck; // close q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); if (!q) { log(3, session[s].ip, s, t, "Failed to create PPP packet in processlcp.\n"); @@ -454,7 +457,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l) } else if (*p == EchoReq) { - *p = EchoReply; // reply + *p = EchoReply; // reply *(u32 *) (p + 4) = htonl(session[s].magic); // our magic number q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); if (!q) { @@ -510,7 +513,8 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l) { // happy with our IPCP u16 r = session[s].radius; - if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) { + if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) + { if (!r) r = radiusnew(s); if (r) @@ -537,7 +541,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l) if (!session[s].ip) { log(3, 0, s, t, "Waiting on radius reply\n"); - return ; // have to wait on RADIUS reply + return; // have to wait on RADIUS reply } // form a config reply quoting the IP in the session { @@ -602,7 +606,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l) log(5, session[s].ip, s, t, " DNS2 = %s\n", inet_toa(session[s].dns1)); } } - i = findppp(p, 3); // IP address + i = findppp(p, 3); // IP address if (!i || i[1] != 6) { log(1, 0, s, t, "No IP in IPCP request\n"); @@ -614,7 +618,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l) *(u32 *) (i + 2) = htonl(session[s].ip); *p = ConfigNak; log(4, session[s].ip, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n", - inet_toa(session[s].ip)); + inet_toa(htonl(session[s].ip))); } if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP))) { @@ -634,7 +638,6 @@ void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l) { ipt ip; - CSTAT(call_processipin); log_hex(5, "IP", p, l); @@ -674,7 +677,7 @@ void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l) if (session[s].snoop_ip && session[s].snoop_port) { - // Snooping this session, send it to ASIO + // Snooping this session snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); } STAT(tun_tx_packets); @@ -744,12 +747,12 @@ void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l) } else { - *p = ConfigRej; // reject + *p = ConfigRej; // reject sendccp(t, s); } } else - *p = TerminateAck; // close + *p = TerminateAck; // close if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP))) { log(1,0,0,0, "Failed to send CCP packet.\n"); @@ -775,12 +778,13 @@ void sendchap(tunnelidt t, sessionidt s) return ; } log(1, 0, s, t, "Send CHAP challenge\n"); - { // new challenge + { + // new challenge int n; for (n = 0; n < 15; n++) radius[r].auth[n] = rand(); } - radius[r].chap = 1; // CHAP not PAP + radius[r].chap = 1; // CHAP not PAP radius[r].id++; if (radius[r].state != RADIUSCHAP) radius[r].try = 0; @@ -797,11 +801,11 @@ void sendchap(tunnelidt t, sessionidt s) log(1, 0, s, t, "failed to send CHAP challenge.\n"); return; } - *q = 1; // challenhe - q[1] = radius[r].id; // ID - q[4] = 16; // length - memcpy(q + 5, radius[r].auth, 16); // challenge - strcpy(q + 21, hostname); // our name + *q = 1; // challenge + q[1] = radius[r].id; // ID + q[4] = 16; // length + memcpy(q + 5, radius[r].auth, 16); // challenge + strcpy(q + 21, hostname); // our name *(u16 *) (q + 2) = htons(strlen(hostname) + 21); // length tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it } @@ -811,7 +815,6 @@ void sendchap(tunnelidt t, sessionidt s) // returns start of PPP frame u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype) { - if (size < 12) return NULL; // Need more space than this!! @@ -819,7 +822,7 @@ u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtyp *(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel *(u16 *) (b + 4) = htons(session[s].far); // session b += 6; - if (mtype && !(session[s].l2tp_flags & SESSIONACFC)) + if (mtype == PPPLCP || !(session[s].l2tp_flags & SESSIONACFC)) { *(u16 *) b = htons(0xFF03); // HDLC header b += 2; @@ -852,7 +855,7 @@ u8 *findppp(u8 * b, u8 mtype) while (l) { if (l < b[1] || !b[1]) - return 0; // faulty + return 0; // faulty if (*b == mtype) return b; l -= b[1]; @@ -874,11 +877,14 @@ void initlcp(tunnelidt t, sessionidt s) log(4, 0, s, t, "Sending LCP ConfigReq for PAP\n"); *q = ConfigReq; *(u8 *)(q + 1) = (time_now % 255) + 1; // ID - *(u16 *)(q + 2) = htons(8); // Length - *(u8 *)(q + 4) = 3; - *(u8 *)(q + 5) = 4; - *(u16 *)(q + 6) = htons(0xC023); // PAP - tunnelsend(b, 12 + 8, t); + *(u16 *)(q + 2) = htons(14); // Length + *(u8 *)(q + 4) = 5; + *(u8 *)(q + 5) = 6; + *(u32 *)(q + 6) = htonl(session[s].magic); + *(u8 *)(q + 10) = 3; + *(u8 *)(q + 11) = 4; + *(u16 *)(q + 12) = htons(0xC023); // PAP + tunnelsend(b, 12 + 14, t); } // Send CCP reply