X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/bc5b25832a728dea4346782d84d63128035bcfaf..6b1075b65c4239e97629f3a891f49f5ae9ef3d4b:/ppp.c diff --git a/ppp.c b/ppp.c index 2baad57..e627cda 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.33 2004/11/29 02:17:18 bodea Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.39 2004/12/16 08:49:53 bodea Exp $"; #include #include @@ -19,18 +19,18 @@ extern sessiont *session; extern radiust *radius; extern int tunfd; extern char hostname[]; -extern u32 eth_tx; +extern uint32_t eth_tx; extern time_t time_now; extern configt *config; static void initccp(tunnelidt t, sessionidt s); // Process PAP messages -void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l) +void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { char user[129]; char pass[129]; - u16 hl; + uint16_t hl; CSTAT(call_processpap); @@ -42,7 +42,7 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l) return ; } - if ((hl = ntohs(*(u16 *) (p + 2))) > l) + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); @@ -58,7 +58,7 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l) } { - u8 *b = p; + uint8_t *b = p; b += 4; if (*b && *b < sizeof(user)) memcpy(user, b + 1, *b); @@ -72,18 +72,18 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l) if (session[s].ip || !session[s].radius) { // respond now, either no RADIUS available or already authenticated - u8 b[MAXCONTROL]; - u8 id = p[1]; - u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP); + uint8_t b[MAXCONTROL]; + uint8_t id = p[1]; + uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP); if (!p) 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 + *(uint16_t *) (p + 2) = htons(5); // length + p[4] = 0; // no message if (session[s].ip) { LOG(3, s, t, "Already an IP allocated: %s (%d)\n", @@ -101,7 +101,7 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l) else { // set up RADIUS request - u16 r = session[s].radius; + uint16_t r = session[s].radius; // Run PRE_AUTH plugins struct param_pre_auth packet = { &tunnel[t], &session[s], strdup(user), strdup(pass), PPPPAP, 1 }; @@ -127,10 +127,10 @@ void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l) } // Process CHAP messages -void processchap(tunnelidt t, sessionidt s, u8 *p, u16 l) +void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { - u16 r; - u16 hl; + uint16_t r; + uint16_t hl; CSTAT(call_processchap); @@ -153,7 +153,7 @@ void processchap(tunnelidt t, sessionidt s, u8 *p, u16 l) return ; } - if ((hl = ntohs(*(u16 *) (p + 2))) > l) + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); @@ -240,13 +240,13 @@ static char *ppp_lcp_types[] = { "IdentRequest", }; -static void dumplcp(u8 *p, int l) +static void dumplcp(uint8_t *p, int l) { int x = l - 4; - u8 *o = (p + 4); + uint8_t *o = (p + 4); LOG_HEX(5, "PPP LCP Packet", p, l); - LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) ); + LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((uint16_t *) p)[1]) ); LOG(4, 0, 0, "Length: %d\n", l); if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck) return; @@ -271,14 +271,14 @@ static void dumplcp(u8 *p, int l) { case 1: // Maximum-Receive-Unit if (length == 4) - LOG(4, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2))); + LOG(4, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(uint16_t *)(o + 2))); else LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length); break; case 2: // Async-Control-Character-Map if (length == 6) { - u32 asyncmap = ntohl(*(u32 *)(o + 2)); + uint32_t asyncmap = ntohl(*(uint32_t *)(o + 2)); LOG(4, 0, 0, " %s %x\n", lcp_types[type], asyncmap); } else @@ -287,7 +287,7 @@ static void dumplcp(u8 *p, int l) case 3: // Authentication-Protocol if (length == 4) { - int proto = ntohs(*(u16 *)(o + 2)); + int proto = ntohs(*(uint16_t *)(o + 2)); LOG(4, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto, proto == PPPCHAP ? "CHAP" : proto == PPPPAP ? "PAP" : "UNKNOWN"); @@ -297,14 +297,14 @@ static void dumplcp(u8 *p, int l) break; case 4: // Quality-Protocol { - u32 qp = ntohl(*(u32 *)(o + 2)); + uint32_t qp = ntohl(*(uint32_t *)(o + 2)); LOG(4, 0, 0, " %s %x\n", lcp_types[type], qp); } break; case 5: // Magic-Number if (length == 6) { - u32 magicno = ntohl(*(u32 *)(o + 2)); + uint32_t magicno = ntohl(*(uint32_t *)(o + 2)); LOG(4, 0, 0, " %s %x\n", lcp_types[type], magicno); } else @@ -324,12 +324,12 @@ static void dumplcp(u8 *p, int l) } // Process LCP messages -void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) +void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { - u8 b[MAXCONTROL]; - u8 *q = NULL; - u32 magicno = 0; - u16 hl; + uint8_t b[MAXCONTROL]; + uint8_t *q = NULL; + uint32_t magicno = 0; + uint16_t hl; CSTAT(call_processlcp); @@ -341,7 +341,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) return ; } - if ((hl = ntohs(*(u16 *) (p + 2))) > l) + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l); STAT(tunnel_rx_errors); @@ -357,8 +357,8 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) else if (*p == ConfigReq) { int x = l - 4; - u8 *o = (p + 4); - u8 response = 0; + uint8_t *o = (p + 4); + uint8_t *response = 0; LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l); if (config->debug > 3) dumplcp(p, l); @@ -367,26 +367,28 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) { int type = o[0]; int length = o[1]; + if (length == 0 || type == 0 || x < length) break; switch (type) { case 1: // Maximum-Receive-Unit - session[s].mru = ntohs(*(u16 *)(o + 2)); + session[s].mru = ntohs(*(uint16_t *)(o + 2)); break; case 2: // Async-Control-Character-Map - if (!ntohl(*(u32 *)(o + 2))) // all bits zero is OK + if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK break; - if (response && response != ConfigNak) // rej already queued + if (response && *response != ConfigNak) // rej already queued break; LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n"); if (!response) { - q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP); + q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); if (!q) break; - response = *q++ = ConfigNak; + *q = ConfigNak; + q += 4; } if ((q - b + 11) > sizeof(b)) @@ -399,16 +401,17 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) *q++ = 6; memset(q, 0, 4); // asyncmap 0 q += 4; + *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length break; case 3: // Authentication-Protocol { - int proto = ntohs(*(u16 *)(o + 2)); + int proto = ntohs(*(uint16_t *)(o + 2)); char proto_name[] = "0x0000"; if (proto == PPPPAP) break; - if (response && response != ConfigNak) // rej already queued + if (response && *response != ConfigNak) // rej already queued break; if (proto == PPPCHAP) @@ -420,9 +423,10 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) if (!response) { - q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP); + q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); if (!q) break; - response = *q++ = ConfigNak; + *q = ConfigNak; + q += 4; } if ((q - b + length) > sizeof(b)) @@ -432,13 +436,14 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) } memcpy(q, o, length); - *(u16 *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead + *(uint16_t *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead q += length; + *((uint16_t *) (response + 2)) = htons(q - response); } break; case 5: // Magic-Number - magicno = ntohl(*(u32 *)(o + 2)); + magicno = ntohl(*(uint32_t *)(o + 2)); break; case 4: // Quality-Protocol @@ -448,11 +453,12 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) default: // Reject any unknown options LOG(2, s, t, " Rejecting PPP LCP Option type %d\n", type); - if (!response || response != ConfigRej) // drop nak in favour of rej + if (!response || *response != ConfigRej) // drop nak in favour of rej { - q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP); - if (!q) return; - response = *q++ = ConfigRej; + q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); + if (!q) break; + *q = ConfigRej; + q += 4; } if ((q - b + length) > sizeof(b)) @@ -463,6 +469,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) memcpy(q, o, length); q += length; + *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length } x -= length; o += length; @@ -471,12 +478,12 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) if (!response) { // Send back a ConfigAck - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); + q = response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); if (!q) return; - response = *q = ConfigAck; + *q = ConfigAck; } - LOG(3, s, t, "Sending %s\n", ppp_lcp_types[response]); + LOG(3, s, t, "Sending %s\n", ppp_lcp_types[*response]); tunnelsend(b, l + (q - b), t); if (!(session[s].flags & SF_LCP_ACKED)) @@ -505,7 +512,7 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) { LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n"); *p = EchoReply; // reply - *(u32 *) (p + 4) = htonl(session[s].magic); // our magic number + *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); if (!q) return; tunnelsend(b, l + (q - b), t); // send it @@ -536,9 +543,9 @@ void processlcp(tunnelidt t, sessionidt s, u8 *p, u16 l) } // find a PPP option, returns point to option, or 0 if not found -static u8 *findppp(u8 *b, u8 mtype) +static uint8_t *findppp(uint8_t *b, uint8_t mtype) { - u16 l = ntohs(*(u16 *) (b + 2)); + uint16_t l = ntohs(*(uint16_t *) (b + 2)); if (l < 4) return 0; b += 4; @@ -556,9 +563,9 @@ static u8 *findppp(u8 *b, u8 mtype) } // Process IPCP messages -void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) +void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { - u16 hl; + uint16_t hl; CSTAT(call_processipcp); @@ -570,7 +577,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) return ; } - if ((hl = ntohs(*(u16 *) (p + 2))) > l) + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l); STAT(tunnel_rx_errors); @@ -581,7 +588,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) if (*p == ConfigAck) { // happy with our IPCP - u16 r = session[s].radius; + uint16_t r = session[s].radius; if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) { if (!r) @@ -613,9 +620,8 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) } // form a config reply quoting the IP in the session { - u8 b[MAXCONTROL]; - u8 *i, - *q; + uint8_t b[MAXCONTROL]; + uint8_t *i, *q; q = p + 4; i = p + l; @@ -628,7 +634,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) if (q < i) { // reject - u16 n = 4; + uint16_t n = 4; i = p + l; if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP))) return; @@ -645,7 +651,7 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) } p += p[1]; } - *(u16 *) (q + 2) = htons(n); + *(uint16_t *) (q + 2) = htons(n); LOG(4, s, t, "Sending ConfigRej\n"); tunnelsend(b, n + (q - b), t); // send it } @@ -655,20 +661,22 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) *p = ConfigAck; if ((i = findppp(p, 0x81))) // Primary DNS address { - if (*(u32 *) (i + 2) != htonl(session[s].dns1)) + if (*(uint32_t *) (i + 2) != htonl(session[s].dns1)) { - *(u32 *) (i + 2) = htonl(session[s].dns1); + *(uint32_t *) (i + 2) = htonl(session[s].dns1); *p = ConfigNak; - LOG(5, s, t, " DNS1 = %s\n", fmtaddr(session[s].dns1, 0)); + LOG(5, s, t, " DNS1 = %s\n", + fmtaddr(htonl(session[s].dns1), 0)); } } if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it) { - if (*(u32 *) (i + 2) != htonl(session[s].dns2)) + if (*(uint32_t *) (i + 2) != htonl(session[s].dns2)) { - *(u32 *) (i + 2) = htonl(session[s].dns2); + *(uint32_t *) (i + 2) = htonl(session[s].dns2); *p = ConfigNak; - LOG(5, s, t, " DNS2 = %s\n", fmtaddr(session[s].dns2, 0)); + LOG(5, s, t, " DNS2 = %s\n", + fmtaddr(htonl(session[s].dns2), 0)); } } i = findppp(p, 3); // IP address @@ -678,9 +686,9 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) STAT(tunnel_rx_errors); return ; } - if (*(u32 *) (i + 2) != htonl(session[s].ip)) + if (*(uint32_t *) (i + 2) != htonl(session[s].ip)) { - *(u32 *) (i + 2) = htonl(session[s].ip); + *(uint32_t *) (i + 2) = htonl(session[s].ip); *p = ConfigNak; LOG(4, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n", fmtaddr(htonl(session[s].ip), 0)); @@ -697,15 +705,15 @@ void processipcp(tunnelidt t, sessionidt s, u8 *p, u16 l) // // This MUST be called with at least 4 byte behind 'p'. // (i.e. this routine writes to p[-4]). -void processipin(tunnelidt t, sessionidt s, u8 *p, u16 l) +void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { - ipt ip; + in_addr_t ip; CSTAT(call_processipin); LOG_HEX(5, "IP", p, l); - ip = ntohl(*(u32 *)(p + 12)); + ip = ntohl(*(uint32_t *)(p + 12)); if (l > MAXETHER) { @@ -727,7 +735,7 @@ void processipin(tunnelidt t, sessionidt s, u8 *p, u16 l) // Add on the tun header p -= 4; - *(u32 *)p = htonl(0x00000800); + *(uint32_t *) p = htonl(0x00000800); l += 4; if (session[s].tbf_in && !config->cluster_iam_master) { // Are we throttled and a slave? @@ -771,7 +779,7 @@ void processipin(tunnelidt t, sessionidt s, u8 *p, u16 l) // Helper routine for the TBF filters. // Used to send queued data in from the user. // -void send_ipin(sessionidt s, u8 *buf, int len) +void send_ipin(sessionidt s, uint8_t *buf, int len) { LOG_HEX(5, "IP in throttled", buf, len); @@ -804,10 +812,10 @@ void send_ipin(sessionidt s, u8 *buf, int len) // Process CCP messages -void processccp(tunnelidt t, sessionidt s, u8 *p, u16 l) +void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { - u8 b[MAXCONTROL]; - u8 *q; + uint8_t b[MAXCONTROL]; + uint8_t *q; CSTAT(call_processccp); @@ -857,9 +865,9 @@ void processccp(tunnelidt t, sessionidt s, u8 *p, u16 l) // send a CHAP PP packet void sendchap(tunnelidt t, sessionidt s) { - u8 b[MAXCONTROL]; - u16 r = session[s].radius; - u8 *q; + uint8_t b[MAXCONTROL]; + uint16_t r = session[s].radius; + uint8_t *q; CSTAT(call_sendchap); @@ -896,14 +904,14 @@ void sendchap(tunnelidt t, sessionidt s) 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 + *(uint16_t *) (q + 2) = htons(strlen(hostname) + 21); // length tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it } // fill in a L2TP message with a PPP frame, // copies existing PPP message and changes magic number if seen // returns start of PPP frame -u8 *makeppp(u8 *b, int size, u8 *p, int l, tunnelidt t, sessionidt s, u16 mtype) +uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype) { if (size < 12) // Need more space than this!! { @@ -913,20 +921,20 @@ u8 *makeppp(u8 *b, int size, u8 *p, int l, tunnelidt t, sessionidt s, u16 mtype) return NULL; } - *(u16 *) (b + 0) = htons(0x0002); // L2TP with no options - *(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel - *(u16 *) (b + 4) = htons(session[s].far); // session + *(uint16_t *) (b + 0) = htons(0x0002); // L2TP with no options + *(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel + *(uint16_t *) (b + 4) = htons(session[s].far); // session b += 6; if (mtype == PPPLCP || !(session[s].l2tp_flags & SESSIONACFC)) { - *(u16 *) b = htons(0xFF03); // HDLC header + *(uint16_t *) b = htons(0xFF03); // HDLC header b += 2; } if (mtype < 0x100 && session[s].l2tp_flags & SESSIONPFC) *b++ = mtype; else { - *(u16 *) b = htons(mtype); + *(uint16_t *) b = htons(mtype); b += 2; } @@ -954,14 +962,14 @@ void initlcp(tunnelidt t, sessionidt s) LOG(4, s, t, "Sending LCP ConfigReq for PAP\n"); *q = ConfigReq; - *(u8 *)(q + 1) = (time_now % 255) + 1; // ID - *(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(PPPPAP); // PAP + *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID + *(uint16_t *)(q + 2) = htons(14); // Length + *(uint8_t *)(q + 4) = 5; + *(uint8_t *)(q + 5) = 6; + *(uint32_t *)(q + 6) = htonl(session[s].magic); + *(uint8_t *)(q + 10) = 3; + *(uint8_t *)(q + 11) = 4; + *(uint16_t *)(q + 12) = htons(PPPPAP); // PAP LOG_HEX(5, "PPPLCP", q, 14); tunnelsend(b, (q - b) + 14, t); @@ -977,8 +985,8 @@ static void initccp(tunnelidt t, sessionidt s) LOG(4, s, t, "Sending CCP ConfigReq for no compression\n"); *q = ConfigReq; - *(u8 *)(q + 1) = (time_now % 255) + 1; // ID - *(u16 *)(q + 2) = htons(4); // Length + *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID + *(uint16_t *)(q + 2) = htons(4); // Length LOG_HEX(5, "PPPCCP", q, 4); tunnelsend(b, (q - b) + 4 , t);