/* $OpenBSD: ipxcp.c,v 1.10 2002/07/01 19:31:37 deraadt Exp $ */ /* * ipxcp.c - PPP IPX Control Protocol. * * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifdef IPX_CHANGE #ifndef lint #if 0 static char rcsid[] = "Id: ipxcp.c,v 1.6 1998/03/25 03:08:16 paulus Exp $"; #else static char rcsid[] = "$OpenBSD: ipxcp.c,v 1.10 2002/07/01 19:31:37 deraadt Exp $"; #endif #endif /* * TODO: */ #include <stdio.h> #include <string.h> #include <syslog.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <unistd.h> #include "pppd.h" #include "fsm.h" #include "ipxcp.h" #include "magic.h" #include "pathnames.h" /* global vars */ ipxcp_options ipxcp_wantoptions[NUM_PPP]; /* Options that we want to request */ ipxcp_options ipxcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ ipxcp_options ipxcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ ipxcp_options ipxcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ #define wo (&ipxcp_wantoptions[0]) #define ao (&ipxcp_allowoptions[0]) #define go (&ipxcp_gotoptions[0]) #define ho (&ipxcp_hisoptions[0]) /* * Callbacks for fsm code. (CI = Configuration Information) */ static void ipxcp_resetci(fsm *); /* Reset our CI */ static int ipxcp_cilen(fsm *); /* Return length of our CI */ static void ipxcp_addci(fsm *, u_char *, int *); /* Add our CI */ static int ipxcp_ackci(fsm *, u_char *, int); /* Peer ack'd our CI */ static int ipxcp_nakci(fsm *, u_char *, int); /* Peer nak'd our CI */ static int ipxcp_rejci(fsm *, u_char *, int); /* Peer rej'd our CI */ static int ipxcp_reqci(fsm *, u_char *, int *, int); /* Rcv CI */ static void ipxcp_up(fsm *); /* We're UP */ static void ipxcp_down(fsm *); /* We're DOWN */ static void ipxcp_script(fsm *, char *); /* Run an up/down script */ fsm ipxcp_fsm[NUM_PPP]; /* IPXCP fsm structure */ static fsm_callbacks ipxcp_callbacks = { /* IPXCP callback routines */ ipxcp_resetci, /* Reset our Configuration Information */ ipxcp_cilen, /* Length of our Configuration Information */ ipxcp_addci, /* Add our Configuration Information */ ipxcp_ackci, /* ACK our Configuration Information */ ipxcp_nakci, /* NAK our Configuration Information */ ipxcp_rejci, /* Reject our Configuration Information */ ipxcp_reqci, /* Request peer's Configuration Information */ ipxcp_up, /* Called when fsm reaches OPENED state */ ipxcp_down, /* Called when fsm leaves OPENED state */ NULL, /* Called when we want the lower layer up */ NULL, /* Called when we want the lower layer down */ NULL, /* Called when Protocol-Reject received */ NULL, /* Retransmission is necessary */ NULL, /* Called to handle protocol-specific codes */ "IPXCP" /* String name of protocol */ }; /* * Protocol entry points. */ static void ipxcp_init(int); static void ipxcp_open(int); static void ipxcp_close(int, char *); static void ipxcp_lowerup(int); static void ipxcp_lowerdown(int); static void ipxcp_input(int, u_char *, int); static void ipxcp_protrej(int); static int ipxcp_printpkt(u_char *, int, void (*)(void *, char *, ...), void *); struct protent ipxcp_protent = { PPP_IPXCP, ipxcp_init, ipxcp_input, ipxcp_protrej, ipxcp_lowerup, ipxcp_lowerdown, ipxcp_open, ipxcp_close, ipxcp_printpkt, NULL, 0, "IPXCP", NULL, NULL, NULL }; /* * Lengths of configuration options. */ #define CILEN_VOID 2 #define CILEN_COMPLETE 2 /* length of complete option */ #define CILEN_NETN 6 /* network number length option */ #define CILEN_NODEN 8 /* node number length option */ #define CILEN_PROTOCOL 4 /* Minimum length of routing protocol */ #define CILEN_NAME 3 /* Minimum length of router name */ #define CILEN_COMPRESS 4 /* Minimum length of compression protocol */ #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ (x) == CONFNAK ? "NAK" : "REJ") /* Used in printing the node number */ #define NODE(base) base[0], base[1], base[2], base[3], base[4], base[5] /* Used to generate the proper bit mask */ #define BIT(num) (1 << (num)) /* * Convert from internal to external notation */ static short int to_external(internal) short int internal; { short int external; if (internal & IPX_NONE) external = IPX_NONE; else external = RIP_SAP; return external; } /* * Make a string representation of a network IP address. */ char * ipx_ntoa(ipxaddr) u_int32_t ipxaddr; { static char b[64]; sprintf(b, "%x", ipxaddr); return b; } /* * ipxcp_init - Initialize IPXCP. */ static void ipxcp_init(unit) int unit; { fsm *f = &ipxcp_fsm[unit]; f->unit = unit; f->protocol = PPP_IPXCP; f->callbacks = &ipxcp_callbacks; fsm_init(&ipxcp_fsm[unit]); memset (wo->name, 0, sizeof (wo->name)); memset (wo->our_node, 0, sizeof (wo->our_node)); memset (wo->his_node, 0, sizeof (wo->his_node)); wo->neg_nn = 1; wo->neg_complete = 1; wo->network = 0; ao->neg_node = 1; ao->neg_nn = 1; ao->neg_name = 1; ao->neg_complete = 1; ao->neg_router = 1; ao->accept_local = 0; ao->accept_remote = 0; ao->accept_network = 0; wo->tried_rip = 0; wo->tried_nlsp = 0; } /* * Copy the node number */ static void copy_node (src, dst) u_char *src, *dst; { memcpy (dst, src, sizeof (ipxcp_wantoptions[0].our_node)); } /* * Compare node numbers */ static int compare_node (src, dst) u_char *src, *dst; { return memcmp (dst, src, sizeof (ipxcp_wantoptions[0].our_node)) == 0; } /* * Is the node number zero? */ static int zero_node (node) u_char *node; { int indx; for (indx = 0; indx < sizeof (ipxcp_wantoptions[0].our_node); ++indx) if (node [indx] != 0) return 0; return 1; } /* * Increment the node number */ static void inc_node (node) u_char *node; { u_char *outp; u_int32_t magic_num; outp = node; magic_num = magic(); *outp++ = '\0'; *outp++ = '\0'; PUTLONG (magic_num, outp); } /* * ipxcp_open - IPXCP is allowed to come up. */ static void ipxcp_open(unit) int unit; { fsm_open(&ipxcp_fsm[unit]); } /* * ipxcp_close - Take IPXCP down. */ static void ipxcp_close(unit, reason) int unit; char *reason; { fsm_close(&ipxcp_fsm[unit], reason); } /* * ipxcp_lowerup - The lower layer is up. */ static void ipxcp_lowerup(unit) int unit; { fsm_lowerup(&ipxcp_fsm[unit]); } /* * ipxcp_lowerdown - The lower layer is down. */ static void ipxcp_lowerdown(unit) int unit; { fsm_lowerdown(&ipxcp_fsm[unit]); } /* * ipxcp_input - Input IPXCP packet. */ static void ipxcp_input(unit, p, len) int unit; u_char *p; int len; { fsm_input(&ipxcp_fsm[unit], p, len); } /* * ipxcp_protrej - A Protocol-Reject was received for IPXCP. * * Pretend the lower layer went down, so we shut up. */ static void ipxcp_protrej(unit) int unit; { fsm_lowerdown(&ipxcp_fsm[unit]); } /* * ipxcp_resetci - Reset our CI. */ static void ipxcp_resetci(f) fsm *f; { wo->req_node = wo->neg_node && ao->neg_node; wo->req_nn = wo->neg_nn && ao->neg_nn; if (wo->our_network == 0) { wo->neg_node = 1; ao->accept_network = 1; } /* * If our node number is zero then change it. */ if (zero_node (wo->our_node)) { inc_node (wo->our_node); ao->accept_local = 1; wo->neg_node = 1; } /* * If his node number is zero then change it. */ if (zero_node (wo->his_node)) { inc_node (wo->his_node); ao->accept_remote = 1; } /* * If no routing agent was specified then we do RIP/SAP according to the * RFC documents. If you have specified something then OK. Otherwise, we * do RIP/SAP. */ if (ao->router == 0) { ao->router |= BIT(RIP_SAP); wo->router |= BIT(RIP_SAP); } /* Always specify a routing protocol unless it was REJected. */ wo->neg_router = 1; /* * Start with these default values */ *go = *wo; } /* * ipxcp_cilen - Return length of our CI. */ static int ipxcp_cilen(f) fsm *f; { int len; len = go->neg_nn ? CILEN_NETN : 0; len += go->neg_node ? CILEN_NODEN : 0; len += go->neg_name ? CILEN_NAME + strlen (go->name) - 1 : 0; /* RFC says that defaults should not be included. */ if (go->neg_router && to_external(go->router) != RIP_SAP) len += CILEN_PROTOCOL; return (len); } /* * ipxcp_addci - Add our desired CIs to a packet. */ static void ipxcp_addci(f, ucp, lenp) fsm *f; u_char *ucp; int *lenp; { /* * Add the options to the record. */ if (go->neg_nn) { PUTCHAR (IPX_NETWORK_NUMBER, ucp); PUTCHAR (CILEN_NETN, ucp); PUTLONG (go->our_network, ucp); } if (go->neg_node) { int indx; PUTCHAR (IPX_NODE_NUMBER, ucp); PUTCHAR (CILEN_NODEN, ucp); for (indx = 0; indx < sizeof (go->our_node); ++indx) PUTCHAR (go->our_node[indx], ucp); } if (go->neg_name) { int cilen = strlen (go->name); int indx; PUTCHAR (IPX_ROUTER_NAME, ucp); PUTCHAR (CILEN_NAME + cilen - 1, ucp); for (indx = 0; indx < cilen; ++indx) PUTCHAR (go->name [indx], ucp); } if (go->neg_router) { short external = to_external (go->router); if (external != RIP_SAP) { PUTCHAR (IPX_ROUTER_PROTOCOL, ucp); PUTCHAR (CILEN_PROTOCOL, ucp); PUTSHORT (external, ucp); } } } /* * ipxcp_ackci - Ack our CIs. * * Returns: * 0 - Ack was bad. * 1 - Ack was good. */ static int ipxcp_ackci(f, p, len) fsm *f; u_char *p; int len; { u_short cilen, citype, cishort; u_char cichar; u_int32_t cilong; #define ACKCIVOID(opt, neg) \ if (neg) { \ if ((len -= CILEN_VOID) < 0) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != CILEN_VOID || \ citype != opt) \ break; \ } #define ACKCICOMPLETE(opt,neg) ACKCIVOID(opt, neg) #define ACKCICHARS(opt, neg, val, cnt) \ if (neg) { \ int indx, count = cnt; \ len -= (count + 2); \ if (len < 0) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != (count + 2) || \ citype != opt) \ break; \ for (indx = 0; indx < count; ++indx) {\ GETCHAR(cichar, p); \ if (cichar != ((u_char *) &val)[indx]) \ break; \ }\ if (indx != count) \ break; \ } #define ACKCINODE(opt,neg,val) ACKCICHARS(opt,neg,val,sizeof(val)) #define ACKCINAME(opt,neg,val) ACKCICHARS(opt,neg,val,strlen(val)) #define ACKCINETWORK(opt, neg, val) \ if (neg) { \ if ((len -= CILEN_NETN) < 0) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != CILEN_NETN || \ citype != opt) \ break; \ GETLONG(cilong, p); \ if (cilong != val) \ break; \ } #define ACKCIPROTO(opt, neg, val) \ if (neg) { \ if (len < 2) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != CILEN_PROTOCOL || citype != opt) \ break; \ len -= cilen; \ if (len < 0) \ break; \ GETSHORT(cishort, p); \ if (cishort != to_external (val) || cishort == RIP_SAP) \ break; \ } /* * Process the ACK frame in the order in which the frame was assembled */ do { ACKCINETWORK (IPX_NETWORK_NUMBER, go->neg_nn, go->our_network); ACKCINODE (IPX_NODE_NUMBER, go->neg_node, go->our_node); ACKCINAME (IPX_ROUTER_NAME, go->neg_name, go->name); ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); /* * This is the end of the record. */ if (len == 0) return (1); } while (0); /* * The frame is invalid */ IPXCPDEBUG((LOG_INFO, "ipxcp_ackci: received bad Ack!")); return (0); } /* * ipxcp_nakci - Peer has sent a NAK for some of our CIs. * This should not modify any state if the Nak is bad * or if IPXCP is in the OPENED state. * * Returns: * 0 - Nak was bad. * 1 - Nak was good. */ static int ipxcp_nakci(f, p, len) fsm *f; u_char *p; int len; { u_char citype, cilen, *next; u_short s; u_int32_t l; ipxcp_options no; /* options we've seen Naks for */ ipxcp_options try; /* options to request next time */ BZERO(&no, sizeof(no)); try = *go; while (len > CILEN_VOID) { GETCHAR (citype, p); GETCHAR (cilen, p); len -= cilen; if (len < 0) goto bad; next = &p [cilen - CILEN_VOID]; switch (citype) { case IPX_NETWORK_NUMBER: if (!go->neg_nn || no.neg_nn || (cilen != CILEN_NETN)) goto bad; no.neg_nn = 1; GETLONG(l, p); IPXCPDEBUG((LOG_INFO, "local IP address %d", l)); if (l && ao->accept_network) try.our_network = l; break; case IPX_NODE_NUMBER: if (!go->neg_node || no.neg_node || (cilen != CILEN_NODEN)) goto bad; no.neg_node = 1; IPXCPDEBUG((LOG_INFO, "local node number %02X%02X%02X%02X%02X%02X", NODE(p))); if (!zero_node (p) && ao->accept_local && ! compare_node (p, ho->his_node)) copy_node (p, try.our_node); break; /* This has never been sent. Ignore the NAK frame */ case IPX_COMPRESSION_PROTOCOL: goto bad; case IPX_ROUTER_PROTOCOL: if (!go->neg_router || (cilen < CILEN_PROTOCOL)) goto bad; GETSHORT (s, p); if (s > 15) /* This is just bad, but ignore for now. */ break; s = BIT(s); if (no.router & s) /* duplicate NAKs are always bad */ goto bad; if (no.router == 0) /* Reset on first NAK only */ try.router = 0; no.router |= s; try.router |= s; try.neg_router = 1; IPXCPDEBUG((LOG_INFO, "Router protocol number %d", s)); break; /* These, according to the RFC, must never be NAKed. */ case IPX_ROUTER_NAME: case IPX_COMPLETE: goto bad; /* These are for options which we have not seen. */ default: break; } p = next; } /* If there is still anything left, this packet is bad. */ if (len != 0) goto bad; /* * Do not permit the peer to force a router protocol which we do not * support. However, default to the condition that will accept "NONE". */ try.router &= (ao->router | BIT(IPX_NONE)); if (try.router == 0 && ao->router != 0) try.router = BIT(IPX_NONE); if (try.router != 0) try.neg_router = 1; /* * OK, the Nak is good. Now we can update state. */ if (f->state != OPENED) *go = try; return 1; bad: IPXCPDEBUG((LOG_INFO, "ipxcp_nakci: received bad Nak!")); return 0; } /* * ipxcp_rejci - Reject some of our CIs. */ static int ipxcp_rejci(f, p, len) fsm *f; u_char *p; int len; { u_short cilen, citype, cishort; u_char cichar; u_int32_t cilong; ipxcp_options try; /* options to request next time */ #define REJCINETWORK(opt, neg, val) \ if (neg && p[0] == opt) { \ if ((len -= CILEN_NETN) < 0) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != CILEN_NETN || \ citype != opt) \ break; \ GETLONG(cilong, p); \ if (cilong != val) \ break; \ IPXCPDEBUG((LOG_INFO,"ipxcp_rejci rejected long opt %d", opt)); \ neg = 0; \ } #define REJCICHARS(opt, neg, val, cnt) \ if (neg && p[0] == opt) { \ int indx, count = cnt; \ len -= (count + 2); \ if (len < 0) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != (count + 2) || \ citype != opt) \ break; \ for (indx = 0; indx < count; ++indx) {\ GETCHAR(cichar, p); \ if (cichar != ((u_char *) &val)[indx]) \ break; \ }\ if (indx != count) \ break; \ IPXCPDEBUG((LOG_INFO,"ipxcp_rejci rejected opt %d", opt)); \ neg = 0; \ } #define REJCINODE(opt,neg,val) REJCICHARS(opt,neg,val,sizeof(val)) #define REJCINAME(opt,neg,val) REJCICHARS(opt,neg,val,strlen(val)) #define REJCIVOID(opt, neg) \ if (neg && p[0] == opt) { \ if ((len -= CILEN_VOID) < 0) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != CILEN_VOID || citype != opt) \ break; \ IPXCPDEBUG((LOG_INFO, "ipxcp_rejci rejected void opt %d", opt)); \ neg = 0; \ } /* a reject for RIP/SAP is invalid since we don't send it and you can't reject something which is not sent. (You can NAK, but you can't REJ.) */ #define REJCIPROTO(opt, neg, val, bit) \ if (neg && p[0] == opt) { \ if ((len -= CILEN_PROTOCOL) < 0) \ break; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != CILEN_PROTOCOL) \ break; \ GETSHORT(cishort, p); \ if (cishort != to_external (val) || cishort == RIP_SAP) \ break; \ IPXCPDEBUG((LOG_INFO, "ipxcp_rejci short opt %d", opt)); \ neg = 0; \ } /* * Any Rejected CIs must be in exactly the same order that we sent. * Check packet length and CI length at each step. * If we find any deviations, then this packet is bad. */ try = *go; do { REJCINETWORK (IPX_NETWORK_NUMBER, try.neg_nn, try.our_network); REJCINODE (IPX_NODE_NUMBER, try.neg_node, try.our_node); REJCINAME (IPX_ROUTER_NAME, try.neg_name, try.name); REJCIPROTO (IPX_ROUTER_PROTOCOL, try.neg_router, try.router, 0); /* * This is the end of the record. */ if (len == 0) { if (f->state != OPENED) *go = try; return (1); } } while (0); /* * The frame is invalid at this point. */ IPXCPDEBUG((LOG_INFO, "ipxcp_rejci: received bad Reject!")); return 0; } /* * ipxcp_reqci - Check the peer's requested CIs and send appropriate response. * * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified * appropriately. If reject_if_disagree is non-zero, doesn't return * CONFNAK; returns CONFREJ if it can't return CONFACK. */ static int ipxcp_reqci(f, inp, len, reject_if_disagree) fsm *f; u_char *inp; /* Requested CIs */ int *len; /* Length of requested CIs */ int reject_if_disagree; { u_char *cip, *next; /* Pointer to current and next CIs */ u_short cilen, citype; /* Parsed len, type */ u_short cishort; /* Parsed short value */ u_int32_t tl, cinetwork; /* Parsed address values */ int rc = CONFACK; /* Final packet return code */ int orc; /* Individual option return code */ u_char *p; /* Pointer to next char to parse */ u_char *ucp = inp; /* Pointer to current output char */ int l = *len; /* Length left */ /* * Reset all his options. */ BZERO(ho, sizeof(*ho)); /* * Process all his options. */ next = inp; while (l) { orc = CONFACK; /* Assume success */ cip = p = next; /* Remember begining of CI */ if (l < 2 || /* Not enough data for CI header or */ p[1] < 2 || /* CI length too small or */ p[1] > l) { /* CI length too big? */ IPXCPDEBUG((LOG_INFO, "ipxcp_reqci: bad CI length!")); orc = CONFREJ; /* Reject bad CI */ cilen = l; /* Reject till end of packet */ l = 0; /* Don't loop again */ goto endswitch; } GETCHAR(citype, p); /* Parse CI type */ GETCHAR(cilen, p); /* Parse CI length */ l -= cilen; /* Adjust remaining length */ next += cilen; /* Step to next CI */ switch (citype) { /* Check CI type */ /* * The network number must match. Choose the larger of the two. */ case IPX_NETWORK_NUMBER: IPXCPDEBUG((LOG_INFO, "ipxcp: received Network Number request")); /* if we wont negotiate the network number or the length is wrong then reject the option */ if ( !ao->neg_nn || cilen != CILEN_NETN ) { orc = CONFREJ; break; } GETLONG(cinetwork, p); IPXCPDEBUG((LOG_INFO,"Remote proposed IPX network number is %8x",tl)); /* If the network numbers match then acknowledge them. */ if (cinetwork != 0) { ho->his_network = cinetwork; ho->neg_nn = 1; if (wo->our_network == cinetwork) break; /* * If the network number is not given or we don't accept their change or * the network number is too small then NAK it. */ if (! ao->accept_network || cinetwork < wo->our_network) { DECPTR (sizeof (u_int32_t), p); PUTLONG (wo->our_network, p); orc = CONFNAK; } break; } /* * The peer sent '0' for the network. Give it ours if we have one. */ if (go->our_network != 0) { DECPTR (sizeof (u_int32_t), p); PUTLONG (wo->our_network, p); orc = CONFNAK; /* * We don't have one. Reject the value. */ } else orc = CONFREJ; break; /* * The node number is required */ case IPX_NODE_NUMBER: IPXCPDEBUG((LOG_INFO, "ipxcp: received Node Number request")); /* if we wont negotiate the node number or the length is wrong then reject the option */ if ( cilen != CILEN_NODEN ) { orc = CONFREJ; break; } copy_node (p, ho->his_node); ho->neg_node = 1; /* * If the remote does not have a number and we do then NAK it with the value * which we have for it. (We never have a default value of zero.) */ if (zero_node (ho->his_node)) { orc = CONFNAK; copy_node (wo->his_node, p); INCPTR (sizeof (wo->his_node), p); break; } /* * If you have given me the expected network node number then I'll accept * it now. */ if (compare_node (wo->his_node, ho->his_node)) { orc = CONFACK; ho->neg_node = 1; INCPTR (sizeof (wo->his_node), p); break; } /* * If his node number is the same as ours then ask him to try the next * value. */ if (compare_node (ho->his_node, go->our_node)) { inc_node (ho->his_node); orc = CONFNAK; copy_node (ho->his_node, p); INCPTR (sizeof (wo->his_node), p); break; } /* * If we don't accept a new value then NAK it. */ if (! ao->accept_remote) { copy_node (wo->his_node, p); INCPTR (sizeof (wo->his_node), p); orc = CONFNAK; break; } orc = CONFACK; ho->neg_node = 1; INCPTR (sizeof (wo->his_node), p); break; /* * Compression is not desired at this time. It is always rejected. */ case IPX_COMPRESSION_PROTOCOL: IPXCPDEBUG((LOG_INFO, "ipxcp: received Compression Protocol request ")); orc = CONFREJ; break; /* * The routing protocol is a bitmask of various types. Any combination * of the values RIP_SAP and NLSP are permissible. 'IPX_NONE' for no * routing protocol must be specified only once. */ case IPX_ROUTER_PROTOCOL: if ( !ao->neg_router || cilen < CILEN_PROTOCOL ) { orc = CONFREJ; break; } GETSHORT (cishort, p); IPXCPDEBUG((LOG_INFO, "Remote router protocol number 0x%04x", cishort)); if (wo->neg_router == 0) { wo->neg_router = 1; wo->router = BIT(IPX_NONE); } if ((cishort == IPX_NONE && ho->router != 0) || (ho->router & BIT(IPX_NONE))) { orc = CONFREJ; break; } cishort = BIT(cishort); if (ho->router & cishort) { orc = CONFREJ; break; } ho->router |= cishort; ho->neg_router = 1; /* Finally do not allow a router protocol which we do not support. */ if ((cishort & (ao->router | BIT(IPX_NONE))) == 0) { int protocol; if (cishort == BIT(NLSP) && (ao->router & BIT(RIP_SAP)) && !wo->tried_rip) { protocol = RIP_SAP; wo->tried_rip = 1; } else protocol = IPX_NONE; DECPTR (sizeof (u_int16_t), p); PUTSHORT (protocol, p); orc = CONFNAK; } break; /* * The router name is advisorary. Just accept it if it is not too large. */ case IPX_ROUTER_NAME: IPXCPDEBUG((LOG_INFO, "ipxcp: received Router Name request")); if (cilen >= CILEN_NAME) { int name_size = cilen - CILEN_NAME; if (name_size > sizeof (ho->name)) name_size = sizeof (ho->name) - 1; memset (ho->name, 0, sizeof (ho->name)); memcpy (ho->name, p, name_size); ho->name [name_size] = '\0'; ho->neg_name = 1; orc = CONFACK; break; } orc = CONFREJ; break; /* * This is advisorary. */ case IPX_COMPLETE: IPXCPDEBUG((LOG_INFO, "ipxcp: received Complete request")); if (cilen != CILEN_COMPLETE) orc = CONFREJ; else { ho->neg_complete = 1; orc = CONFACK; } break; /* * All other entries are not known at this time. */ default: IPXCPDEBUG((LOG_INFO, "ipxcp: received Complete request")); orc = CONFREJ; break; } endswitch: IPXCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc))); if (orc == CONFACK && /* Good CI */ rc != CONFACK) /* but prior CI wasnt? */ continue; /* Don't send this one */ if (orc == CONFNAK) { /* Nak this CI? */ if (reject_if_disagree) /* Getting fed up with sending NAKs? */ orc = CONFREJ; /* Get tough if so */ if (rc == CONFREJ) /* Rejecting prior CI? */ continue; /* Don't send this one */ if (rc == CONFACK) { /* Ack'd all prior CIs? */ rc = CONFNAK; /* Not anymore... */ ucp = inp; /* Backup */ } } if (orc == CONFREJ && /* Reject this CI */ rc != CONFREJ) { /* but no prior ones? */ rc = CONFREJ; ucp = inp; /* Backup */ } /* Need to move CI? */ if (ucp != cip) BCOPY(cip, ucp, cilen); /* Move it */ /* Update output pointer */ INCPTR(cilen, ucp); } /* * If we aren't rejecting this packet, and we want to negotiate * their address, and they didn't send their address, then we * send a NAK with a IPX_NODE_NUMBER option appended. We assume the * input buffer is long enough that we can append the extra * option safely. */ if (rc != CONFREJ && !ho->neg_node && wo->req_nn && !reject_if_disagree) { if (rc == CONFACK) { rc = CONFNAK; wo->req_nn = 0; /* don't ask again */ ucp = inp; /* reset pointer */ } if (zero_node (wo->his_node)) inc_node (wo->his_node); PUTCHAR (IPX_NODE_NUMBER, ucp); PUTCHAR (CILEN_NODEN, ucp); copy_node (wo->his_node, ucp); INCPTR (sizeof (wo->his_node), ucp); } *len = ucp - inp; /* Compute output length */ IPXCPDEBUG((LOG_INFO, "ipxcp: returning Configure-%s", CODENAME(rc))); return (rc); /* Return final code */ } /* * ipxcp_up - IPXCP has come UP. * * Configure the IP network interface appropriately and bring it up. */ static void ipxcp_up(f) fsm *f; { int unit = f->unit; IPXCPDEBUG((LOG_INFO, "ipxcp: up")); /* The default router protocol is RIP/SAP. */ if (ho->router == 0) ho->router = BIT(RIP_SAP); if (go->router == 0) go->router = BIT(RIP_SAP); /* Fetch the network number */ if (!ho->neg_nn) ho->his_network = wo->his_network; if (!ho->neg_node) copy_node (wo->his_node, ho->his_node); if (!wo->neg_node && !go->neg_node) copy_node (wo->our_node, go->our_node); if (zero_node (go->our_node)) { static char errmsg[] = "Could not determine local IPX node address"; IPXCPDEBUG((LOG_ERR, errmsg)); ipxcp_close(f->unit, errmsg); return; } go->network = go->our_network; if (ho->his_network != 0 && ho->his_network > go->network) go->network = ho->his_network; if (go->network == 0) { static char errmsg[] = "Can not determine network number"; IPXCPDEBUG((LOG_ERR, errmsg)); ipxcp_close (unit, errmsg); return; } /* bring the interface up */ if (!sifup(unit)) { IPXCPDEBUG((LOG_WARNING, "sifup failed")); ipxcp_close(unit, "Interface configuration failed"); return; } /* set the network number for IPX */ if (!sipxfaddr(unit, go->network, go->our_node)) { IPXCPDEBUG((LOG_WARNING, "sipxfaddr failed")); ipxcp_close(unit, "Interface configuration failed"); return; } /* * Execute the ipx-up script, like this: * /etc/ppp/ipx-up interface tty speed local-IPX remote-IPX */ ipxcp_script (f, _PATH_IPXUP); } /* * ipxcp_down - IPXCP has gone DOWN. * * Take the IP network interface down, clear its addresses * and delete routes through it. */ static void ipxcp_down(f) fsm *f; { IPXCPDEBUG((LOG_INFO, "ipxcp: down")); cipxfaddr (f->unit); sifdown(f->unit); ipxcp_script (f, _PATH_IPXDOWN); } /* * ipxcp_script - Execute a script with arguments * interface-name tty-name speed local-IPX remote-IPX networks. */ static void ipxcp_script(f, script) fsm *f; char *script; { char strspeed[32], strlocal[32], strremote[32]; char strnetwork[32], strpid[32]; char *argv[14], strproto_lcl[32], strproto_rmt[32]; sprintf (strpid, "%ld", (long)getpid()); sprintf (strspeed, "%d", baud_rate); strproto_lcl[0] = '\0'; if (go->neg_router && ((go->router & BIT(IPX_NONE)) == 0)) { if (go->router & BIT(RIP_SAP)) strcpy (strproto_lcl, "RIP "); if (go->router & BIT(NLSP)) strcat (strproto_lcl, "NLSP "); } if (strproto_lcl[0] == '\0') strcpy (strproto_lcl, "NONE "); strproto_lcl[strlen (strproto_lcl)-1] = '\0'; strproto_rmt[0] = '\0'; if (ho->neg_router && ((ho->router & BIT(IPX_NONE)) == 0)) { if (ho->router & BIT(RIP_SAP)) strcpy (strproto_rmt, "RIP "); if (ho->router & BIT(NLSP)) strcat (strproto_rmt, "NLSP "); } if (strproto_rmt[0] == '\0') strcpy (strproto_rmt, "NONE "); strproto_rmt[strlen (strproto_rmt)-1] = '\0'; strcpy (strnetwork, ipx_ntoa (go->network)); sprintf (strlocal, "%02X%02X%02X%02X%02X%02X", NODE(go->our_node)); sprintf (strremote, "%02X%02X%02X%02X%02X%02X", NODE(ho->his_node)); argv[0] = script; argv[1] = ifname; argv[2] = devnam; argv[3] = strspeed; argv[4] = strnetwork; argv[5] = strlocal; argv[6] = strremote; argv[7] = strproto_lcl; argv[8] = strproto_rmt; argv[9] = go->name; argv[10] = ho->name; argv[11] = ipparam; argv[12] = strpid; argv[13] = NULL; run_program(script, argv, 0); } /* * ipxcp_printpkt - print the contents of an IPXCP packet. */ static char *ipxcp_codenames[] = { "ConfReq", "ConfAck", "ConfNak", "ConfRej", "TermReq", "TermAck", "CodeRej" }; static int ipxcp_printpkt(p, plen, printer, arg) u_char *p; int plen; void (*printer)(void *, char *, ...); void *arg; { int code, id, len, olen; u_char *pstart, *optend; u_short cishort; u_int32_t cilong; if (plen < HEADERLEN) return 0; pstart = p; GETCHAR(code, p); GETCHAR(id, p); GETSHORT(len, p); if (len < HEADERLEN || len > plen) return 0; if (code >= 1 && code <= sizeof(ipxcp_codenames) / sizeof(char *)) printer(arg, " %s", ipxcp_codenames[code-1]); else printer(arg, " code=0x%x", code); printer(arg, " id=0x%x", id); len -= HEADERLEN; switch (code) { case CONFREQ: case CONFACK: case CONFNAK: case CONFREJ: /* print option list */ while (len >= 2) { GETCHAR(code, p); GETCHAR(olen, p); p -= 2; if (olen < CILEN_VOID || olen > len) { break; } printer(arg, " <"); len -= olen; optend = p + olen; switch (code) { case IPX_NETWORK_NUMBER: if (olen == CILEN_NETN) { p += CILEN_VOID; GETLONG(cilong, p); printer (arg, "network %s", ipx_ntoa (cilong)); } break; case IPX_NODE_NUMBER: if (olen == CILEN_NODEN) { p += CILEN_VOID; printer (arg, "node "); while (p < optend) { GETCHAR(code, p); printer(arg, "%.2x", code); } } break; case IPX_COMPRESSION_PROTOCOL: if (olen == CILEN_COMPRESS) { p += CILEN_VOID; GETSHORT (cishort, p); printer (arg, "compression %d", (int) cishort); } break; case IPX_ROUTER_PROTOCOL: if (olen == CILEN_PROTOCOL) { p += CILEN_VOID; GETSHORT (cishort, p); printer (arg, "router proto %d", (int) cishort); } break; case IPX_ROUTER_NAME: if (olen >= CILEN_NAME) { p += CILEN_VOID; printer (arg, "router name \""); while (p < optend) { GETCHAR(code, p); if (code >= 0x20 && code <= 0x7E) printer (arg, "%c", (int) (unsigned int) (unsigned char) code); else printer (arg, " \\%.2x", (int) (unsigned int) (unsigned char) code); } printer (arg, "\""); } break; case IPX_COMPLETE: if (olen == CILEN_COMPLETE) { p += CILEN_VOID; printer (arg, "complete"); } break; default: break; } while (p < optend) { GETCHAR(code, p); printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); } printer(arg, ">"); } break; case TERMACK: case TERMREQ: if (len > 0 && *p >= ' ' && *p < 0x7f) { printer(arg, " "); print_string(p, len, printer, arg); p += len; len = 0; } break; } /* print the rest of the bytes in the packet */ for (; len > 0; --len) { GETCHAR(code, p); printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); } return p - pstart; } #endif /* ifdef IPX_CHANGE */