Nak asyncmap (unless == 0)
bundle ConfigRej options
This commit is contained in:
Brendan O'Dea
parent
f0cab7b0b1
commit
57d13b8222
1 changed files with 112 additions and 89 deletions
201
ppp.c
201
ppp.c
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@ -1,6 +1,6 @@
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// L2TPNS PPP Stuff
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char const *cvs_id_ppp = "$Id: ppp.c,v 1.21 2004-11-05 04:55:27 bodea Exp $";
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char const *cvs_id_ppp = "$Id: ppp.c,v 1.22 2004-11-05 23:18:54 bodea Exp $";
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#include <stdio.h>
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#include <string.h>
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@ -275,46 +275,45 @@ void dumplcp(u8 *p, int l)
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else
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LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
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break;
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case 3: // Authentication-Protocol
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case 2: // Async-Control-Character-Map
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if (length == 6)
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{
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if (length == 4)
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{
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int proto = ntohs(*(u16 *)(o + 2));
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LOG(4, 0, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto,
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proto == PPPCHAP ? "CHAP" :
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proto == PPPPAP ? "PAP" : "UNKNOWN");
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}
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else
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LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
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break;
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u32 asyncmap = ntohl(*(u32 *)(o + 2));
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LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], asyncmap);
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}
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else
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LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
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break;
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case 3: // Authentication-Protocol
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if (length == 4)
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{
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int proto = ntohs(*(u16 *)(o + 2));
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LOG(4, 0, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto,
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proto == PPPCHAP ? "CHAP" :
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proto == PPPPAP ? "PAP" : "UNKNOWN");
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}
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else
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LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
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break;
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case 4: // Quality-Protocol
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{
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u32 qp = ntohl(*(u32 *)(o + 2));
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LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], qp);
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break;
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}
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break;
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case 5: // Magic-Number
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if (length == 6)
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{
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if (length == 6)
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{
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u32 magicno = ntohl(*(u32 *)(o + 2));
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LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], magicno);
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}
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else
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LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
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break;
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u32 magicno = ntohl(*(u32 *)(o + 2));
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LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], magicno);
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}
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else
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LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
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break;
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case 7: // Protocol-Field-Compression
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{
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LOG(4, 0, 0, 0, " %s\n", lcp_types[type]);
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break;
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}
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case 8: // Address-And-Control-Field-Compression
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{
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LOG(4, 0, 0, 0, " %s\n", lcp_types[type]);
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break;
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}
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LOG(4, 0, 0, 0, " %s\n", lcp_types[type]);
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break;
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default:
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LOG(2, 0, 0, 0, " Unknown PPP LCP Option type %d\n", type);
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break;
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@ -359,6 +358,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
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{
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int x = l - 4;
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u8 *o = (p + 4);
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u8 response = 0;
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LOG(3, session[s].ip, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
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if (config->debug > 3) dumplcp(p, l);
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@ -367,97 +367,116 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
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{
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int type = o[0];
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int length = o[1];
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if (length == 0 || type == 0) break;
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if (length == 0 || type == 0 || x < length) break;
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switch (type)
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{
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case 1: // Maximum-Receive-Unit
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session[s].mru = ntohs(*(u16 *)(o + 2));
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break;
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case 2: // asyncmap
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LOG_HEX(2, "PPP LCP Packet", p, l);
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LOG(2, 0, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
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case 2: // Async-Control-Character-Map
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if (!ntohl(*(u32 *)(o + 2))) // all bits zero is OK
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break;
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if (response && response != ConfigNak) // rej already queued
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break;
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LOG(2, session[s].ip, s, t, " Remote requesting asyncmap. Rejecting.\n");
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if (!response)
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{
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q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
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if (!q)
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{
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LOG(2, session[s].ip, s, t, " Failed to send packet.\n");
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break;
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}
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response = *q++ = ConfigNak;
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}
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*q++ = type;
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*q++ = 6;
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memset(q, 0, 4); // asyncmap 0
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q += 4;
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break;
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case 3: // Authentication-Protocol
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{
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int proto = ntohs(*(u16 *)(o + 2));
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if (proto == PPPCHAP)
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{
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LOG(2, session[s].ip, s, t, " Remote end is trying to do CHAP. Rejecting it.\n");
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char proto_name[] = "0x0000";
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if (proto == PPPPAP)
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break;
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if (response && response != ConfigNak) // rej already queued
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break;
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if (proto == PPPCHAP)
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strcpy(proto_name, "CHAP");
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else
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sprintf(proto_name, "%#4.4x", proto);
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LOG(2, session[s].ip, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
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if (!response)
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{
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q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
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if (!q)
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{
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q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
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if (!q) {
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LOG(2, session[s].ip, s, t, " Failed to send packet.\n");
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break;
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}
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*q++ = ConfigNak;
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LOG(2, session[s].ip, s, t, " Failed to send packet.\n");
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break;
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}
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memcpy(q, o, length);
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*(u16 *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead
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q += length;
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response = *q++ = ConfigNak;
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}
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break;
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memcpy(q, o, length);
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*(u16 *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead
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q += length;
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}
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break;
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case 5: // Magic-Number
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{
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magicno = ntohl(*(u32 *)(o + 2));
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break;
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}
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magicno = ntohl(*(u32 *)(o + 2));
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break;
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case 4: // Quality-Protocol
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case 7: // Protocol-Field-Compression
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case 8: // Address-And-Control-Field-Compression
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break;
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case 13: // CallBack option for LCP extention of win2000/routers L2TP client
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case 17:
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case 18:
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{
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// Reject LCP CallBack
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LOG(2, session[s].ip, s, t, " PPP LCP Option type %d, len=%d\n", type, length);
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memcpy(p + 4, o, length);
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*(u16 *)(p + 2) = htons(length + 4);
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*p = ConfigRej;
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q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
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tunnelsend(b, 12 + length + 4, t);
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return;
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break;
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default: // Reject any unknown options
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LOG(2, session[s].ip, s, t, " Rejecting PPP LCP Option type %d\n", type);
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if (!response || response != ConfigRej) // drop nak in favour of rej
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{
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q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
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if (!q)
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{
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LOG(2, session[s].ip, s, t, " Failed to send packet.\n");
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break;
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}
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response = *q++ = ConfigRej;
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}
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default:
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// Reject Unknown LCP Option to stop to send it again
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LOG(2, session[s].ip, s, t, " Unknown PPP LCP Option type %d\n", type);
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memcpy(p + 4, o, length);
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*(u16 *)(p + 2) = htons(length + 4);
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*p = ConfigRej;
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q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
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tunnelsend(b, 12 + length + 4, t);
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return;
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memcpy(q, o, length);
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q += length;
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}
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x -= length;
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o += length;
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}
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if (!(session[s].flags & SF_LCP_ACKED))
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initlcp(t, s);
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if (!q)
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if (!response)
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{
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// Send back a ConfigAck
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LOG(3, session[s].ip, s, t, "ConfigReq accepted, sending as Ack\n");
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q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
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if (!q)
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{
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LOG(3, session[s].ip, s, t, " failed to create packet.\n");
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return;
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}
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*q = ConfigAck;
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tunnelsend(b, l + (q - b), t);
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}
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else
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{
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// Already built a ConfigNak... send it
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LOG(3, session[s].ip, s, t, "Sending ConfigNak\n");
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tunnelsend(b, l + (q - b), t);
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response = *q = ConfigAck;
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}
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LOG(3, session[s].ip, s, t, "Sending %s\n", ppp_lcp_types[response]);
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tunnelsend(b, l + (q - b), t);
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if (!(session[s].flags & SF_LCP_ACKED))
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initlcp(t, s);
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}
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else if (*p == ConfigNak)
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{
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@ -469,7 +488,8 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
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{
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*p = TerminateAck; // close
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q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
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if (!q) {
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if (!q)
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{
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LOG(3, session[s].ip, s, t, "Failed to create PPP packet in processlcp.\n");
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return;
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}
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@ -486,7 +506,8 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l)
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*p = EchoReply; // reply
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*(u32 *) (p + 4) = htonl(session[s].magic); // our magic number
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q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
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if (!q) {
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if (!q)
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{
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LOG(3, session[s].ip, s, t, " failed to send EchoReply.\n");
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return;
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}
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@ -828,7 +849,8 @@ void sendchap(tunnelidt t, sessionidt s)
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return ;
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}
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q = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
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if (!q) {
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if (!q)
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{
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LOG(1, 0, s, t, "failed to send CHAP challenge.\n");
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return;
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}
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@ -901,7 +923,8 @@ void initlcp(tunnelidt t, sessionidt s)
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char b[500] = {0}, *q;
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q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP);
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if (!q) {
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if (!q)
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{
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LOG(1, 0, s, t, "Failed to send LCP ConfigReq.\n");
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return;
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}
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