[d0950ad] | 1 | /* |
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| 2 | * ipxcp.c - PPP IPX Control Protocol. |
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| 3 | * |
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| 4 | * Copyright (c) 1989 Carnegie Mellon University. |
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| 5 | * All rights reserved. |
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| 6 | * |
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| 7 | * Redistribution and use in source and binary forms are permitted |
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| 8 | * provided that the above copyright notice and this paragraph are |
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| 9 | * duplicated in all such forms and that any documentation, |
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| 10 | * advertising materials, and other materials related to such |
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| 11 | * distribution and use acknowledge that the software was developed |
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| 12 | * by Carnegie Mellon University. The name of the |
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| 13 | * University may not be used to endorse or promote products derived |
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| 14 | * from this software without specific prior written permission. |
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| 15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 18 | */ |
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| 19 | |
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| 20 | #ifdef IPX_CHANGE |
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| 21 | #ifndef lint |
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| 22 | /* static char rcsid[] = "$Id$"; */ |
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| 23 | #endif |
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| 24 | |
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| 25 | /* |
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| 26 | * TODO: |
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| 27 | */ |
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| 28 | |
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| 29 | #include <stdio.h> |
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| 30 | #include <string.h> |
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| 31 | #include <syslog.h> |
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| 32 | #include <sys/types.h> |
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| 33 | #include <sys/socket.h> |
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| 34 | #include <netinet/in.h> |
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| 35 | |
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| 36 | #include "pppd.h" |
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| 37 | #include "fsm.h" |
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| 38 | #include "ipxcp.h" |
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| 39 | #include "pathnames.h" |
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| 40 | |
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| 41 | /* global vars */ |
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| 42 | ipxcp_options ipxcp_wantoptions[NUM_PPP]; /* Options that we want to request */ |
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| 43 | ipxcp_options ipxcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ |
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| 44 | ipxcp_options ipxcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ |
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| 45 | ipxcp_options ipxcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ |
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| 46 | |
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| 47 | #define wo (&ipxcp_wantoptions[0]) |
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| 48 | #define ao (&ipxcp_allowoptions[0]) |
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| 49 | #define go (&ipxcp_gotoptions[0]) |
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| 50 | #define ho (&ipxcp_hisoptions[0]) |
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| 51 | |
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| 52 | /* |
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| 53 | * Callbacks for fsm code. (CI = Configuration Information) |
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| 54 | */ |
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| 55 | static void ipxcp_resetci __P((fsm *)); /* Reset our CI */ |
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| 56 | static int ipxcp_cilen __P((fsm *)); /* Return length of our CI */ |
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| 57 | static void ipxcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ |
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| 58 | static int ipxcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ |
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| 59 | static int ipxcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ |
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| 60 | static int ipxcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ |
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| 61 | static int ipxcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ |
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| 62 | static void ipxcp_up __P((fsm *)); /* We're UP */ |
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| 63 | static void ipxcp_down __P((fsm *)); /* We're DOWN */ |
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| 64 | static void ipxcp_script __P((fsm *, char *)); /* Run an up/down script */ |
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| 65 | |
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| 66 | fsm ipxcp_fsm[NUM_PPP]; /* IPXCP fsm structure */ |
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| 67 | |
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| 68 | static fsm_callbacks ipxcp_callbacks = { /* IPXCP callback routines */ |
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| 69 | ipxcp_resetci, /* Reset our Configuration Information */ |
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| 70 | ipxcp_cilen, /* Length of our Configuration Information */ |
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| 71 | ipxcp_addci, /* Add our Configuration Information */ |
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| 72 | ipxcp_ackci, /* ACK our Configuration Information */ |
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| 73 | ipxcp_nakci, /* NAK our Configuration Information */ |
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| 74 | ipxcp_rejci, /* Reject our Configuration Information */ |
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| 75 | ipxcp_reqci, /* Request peer's Configuration Information */ |
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| 76 | ipxcp_up, /* Called when fsm reaches OPENED state */ |
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| 77 | ipxcp_down, /* Called when fsm leaves OPENED state */ |
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| 78 | NULL, /* Called when we want the lower layer up */ |
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| 79 | NULL, /* Called when we want the lower layer down */ |
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| 80 | NULL, /* Called when Protocol-Reject received */ |
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| 81 | NULL, /* Retransmission is necessary */ |
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| 82 | NULL, /* Called to handle protocol-specific codes */ |
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| 83 | "IPXCP" /* String name of protocol */ |
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| 84 | }; |
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| 85 | |
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| 86 | /* |
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| 87 | * Protocol entry points. |
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| 88 | */ |
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| 89 | |
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| 90 | static void ipxcp_init __P((int)); |
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| 91 | static void ipxcp_open __P((int)); |
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| 92 | static void ipxcp_close __P((int, char *)); |
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| 93 | static void ipxcp_lowerup __P((int)); |
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| 94 | static void ipxcp_lowerdown __P((int)); |
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| 95 | static void ipxcp_input __P((int, u_char *, int)); |
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| 96 | static void ipxcp_protrej __P((int)); |
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| 97 | static int ipxcp_printpkt __P((u_char *, int, |
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| 98 | void (*) __P((void *, char *, ...)), void *)); |
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| 99 | |
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| 100 | struct protent ipxcp_protent = { |
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| 101 | PPP_IPXCP, |
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| 102 | ipxcp_init, |
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| 103 | ipxcp_input, |
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| 104 | ipxcp_protrej, |
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| 105 | ipxcp_lowerup, |
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| 106 | ipxcp_lowerdown, |
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| 107 | ipxcp_open, |
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| 108 | ipxcp_close, |
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| 109 | ipxcp_printpkt, |
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| 110 | NULL, |
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| 111 | 0, |
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| 112 | "IPXCP", |
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| 113 | NULL, |
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| 114 | NULL, |
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| 115 | NULL |
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| 116 | }; |
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| 117 | |
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| 118 | /* |
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| 119 | * Lengths of configuration options. |
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| 120 | */ |
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| 121 | |
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| 122 | #define CILEN_VOID 2 |
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| 123 | #define CILEN_COMPLETE 2 /* length of complete option */ |
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| 124 | #define CILEN_NETN 6 /* network number length option */ |
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| 125 | #define CILEN_NODEN 8 /* node number length option */ |
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| 126 | #define CILEN_PROTOCOL 4 /* Minimum length of routing protocol */ |
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| 127 | #define CILEN_NAME 3 /* Minimum length of router name */ |
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| 128 | #define CILEN_COMPRESS 4 /* Minimum length of compression protocol */ |
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| 129 | |
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| 130 | #define CODENAME(x) ((x) == CONFACK ? "ACK" : \ |
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| 131 | (x) == CONFNAK ? "NAK" : "REJ") |
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| 132 | |
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| 133 | /* Used in printing the node number */ |
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| 134 | #define NODE(base) base[0], base[1], base[2], base[3], base[4], base[5] |
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| 135 | |
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| 136 | /* Used to generate the proper bit mask */ |
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| 137 | #define BIT(num) (1 << (num)) |
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| 138 | |
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| 139 | /* |
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| 140 | * Convert from internal to external notation |
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| 141 | */ |
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| 142 | |
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| 143 | static short int |
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| 144 | to_external(internal) |
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| 145 | short int internal; |
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| 146 | { |
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| 147 | short int external; |
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| 148 | |
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| 149 | if (internal & IPX_NONE) |
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| 150 | external = IPX_NONE; |
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| 151 | else |
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| 152 | external = RIP_SAP; |
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| 153 | |
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| 154 | return external; |
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| 155 | } |
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| 156 | |
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| 157 | /* |
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| 158 | * Make a string representation of a network IP address. |
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| 159 | */ |
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| 160 | |
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| 161 | char * |
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| 162 | ipx_ntoa(ipxaddr) |
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| 163 | u_int32_t ipxaddr; |
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| 164 | { |
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| 165 | static char b[64]; |
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| 166 | sprintf(b, "%x", ipxaddr); |
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| 167 | return b; |
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| 168 | } |
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| 169 | |
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| 170 | |
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| 171 | /* |
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| 172 | * ipxcp_init - Initialize IPXCP. |
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| 173 | */ |
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| 174 | static void |
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| 175 | ipxcp_init(unit) |
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| 176 | int unit; |
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| 177 | { |
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| 178 | fsm *f = &ipxcp_fsm[unit]; |
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| 179 | |
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| 180 | f->unit = unit; |
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| 181 | f->protocol = PPP_IPXCP; |
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| 182 | f->callbacks = &ipxcp_callbacks; |
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| 183 | fsm_init(&ipxcp_fsm[unit]); |
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| 184 | |
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| 185 | memset (wo->name, 0, sizeof (wo->name)); |
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| 186 | memset (wo->our_node, 0, sizeof (wo->our_node)); |
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| 187 | memset (wo->his_node, 0, sizeof (wo->his_node)); |
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| 188 | |
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| 189 | wo->neg_nn = 1; |
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| 190 | wo->neg_complete = 1; |
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| 191 | wo->network = 0; |
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| 192 | |
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| 193 | ao->neg_node = 1; |
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| 194 | ao->neg_nn = 1; |
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| 195 | ao->neg_name = 1; |
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| 196 | ao->neg_complete = 1; |
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| 197 | ao->neg_router = 1; |
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| 198 | |
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| 199 | ao->accept_local = 0; |
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| 200 | ao->accept_remote = 0; |
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| 201 | ao->accept_network = 0; |
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| 202 | |
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| 203 | wo->tried_rip = 0; |
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| 204 | wo->tried_nlsp = 0; |
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| 205 | } |
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| 206 | |
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| 207 | /* |
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| 208 | * Copy the node number |
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| 209 | */ |
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| 210 | |
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| 211 | static void |
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| 212 | copy_node (src, dst) |
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| 213 | u_char *src, *dst; |
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| 214 | { |
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| 215 | memcpy (dst, src, sizeof (ipxcp_wantoptions[0].our_node)); |
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| 216 | } |
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| 217 | |
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| 218 | /* |
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| 219 | * Compare node numbers |
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| 220 | */ |
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| 221 | |
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| 222 | static int |
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| 223 | compare_node (src, dst) |
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| 224 | u_char *src, *dst; |
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| 225 | { |
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| 226 | return memcmp (dst, src, sizeof (ipxcp_wantoptions[0].our_node)) == 0; |
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| 227 | } |
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| 228 | |
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| 229 | /* |
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| 230 | * Is the node number zero? |
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| 231 | */ |
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| 232 | |
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| 233 | static int |
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| 234 | zero_node (node) |
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| 235 | u_char *node; |
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| 236 | { |
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| 237 | int indx; |
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| 238 | for (indx = 0; indx < sizeof (ipxcp_wantoptions[0].our_node); ++indx) |
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| 239 | if (node [indx] != 0) |
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| 240 | return 0; |
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| 241 | return 1; |
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| 242 | } |
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| 243 | |
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| 244 | /* |
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| 245 | * Increment the node number |
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| 246 | */ |
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| 247 | |
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| 248 | static void |
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| 249 | inc_node (node) |
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| 250 | u_char *node; |
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| 251 | { |
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| 252 | u_char *outp; |
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| 253 | u_int32_t magic_num; |
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| 254 | |
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| 255 | outp = node; |
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| 256 | magic_num = magic(); |
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| 257 | *outp++ = '\0'; |
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| 258 | *outp++ = '\0'; |
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| 259 | PUTLONG (magic_num, outp); |
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| 260 | } |
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| 261 | |
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| 262 | /* |
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| 263 | * ipxcp_open - IPXCP is allowed to come up. |
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| 264 | */ |
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| 265 | static void |
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| 266 | ipxcp_open(unit) |
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| 267 | int unit; |
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| 268 | { |
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| 269 | fsm_open(&ipxcp_fsm[unit]); |
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| 270 | } |
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| 271 | |
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| 272 | /* |
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| 273 | * ipxcp_close - Take IPXCP down. |
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| 274 | */ |
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| 275 | static void |
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| 276 | ipxcp_close(unit, reason) |
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| 277 | int unit; |
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| 278 | char *reason; |
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| 279 | { |
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| 280 | fsm_close(&ipxcp_fsm[unit], reason); |
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| 281 | } |
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| 282 | |
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| 283 | |
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| 284 | /* |
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| 285 | * ipxcp_lowerup - The lower layer is up. |
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| 286 | */ |
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| 287 | static void |
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| 288 | ipxcp_lowerup(unit) |
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| 289 | int unit; |
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| 290 | { |
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| 291 | fsm_lowerup(&ipxcp_fsm[unit]); |
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| 292 | } |
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| 293 | |
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| 294 | |
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| 295 | /* |
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| 296 | * ipxcp_lowerdown - The lower layer is down. |
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| 297 | */ |
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| 298 | static void |
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| 299 | ipxcp_lowerdown(unit) |
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| 300 | int unit; |
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| 301 | { |
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| 302 | fsm_lowerdown(&ipxcp_fsm[unit]); |
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| 303 | } |
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| 304 | |
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| 305 | |
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| 306 | /* |
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| 307 | * ipxcp_input - Input IPXCP packet. |
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| 308 | */ |
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| 309 | static void |
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| 310 | ipxcp_input(unit, p, len) |
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| 311 | int unit; |
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| 312 | u_char *p; |
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| 313 | int len; |
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| 314 | { |
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| 315 | fsm_input(&ipxcp_fsm[unit], p, len); |
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| 316 | } |
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| 317 | |
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| 318 | |
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| 319 | /* |
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| 320 | * ipxcp_protrej - A Protocol-Reject was received for IPXCP. |
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| 321 | * |
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| 322 | * Pretend the lower layer went down, so we shut up. |
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| 323 | */ |
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| 324 | static void |
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| 325 | ipxcp_protrej(unit) |
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| 326 | int unit; |
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| 327 | { |
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| 328 | fsm_lowerdown(&ipxcp_fsm[unit]); |
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| 329 | } |
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| 330 | |
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| 331 | |
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| 332 | /* |
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| 333 | * ipxcp_resetci - Reset our CI. |
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| 334 | */ |
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| 335 | static void |
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| 336 | ipxcp_resetci(f) |
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| 337 | fsm *f; |
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| 338 | { |
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| 339 | wo->req_node = wo->neg_node && ao->neg_node; |
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| 340 | wo->req_nn = wo->neg_nn && ao->neg_nn; |
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| 341 | |
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| 342 | if (wo->our_network == 0) { |
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| 343 | wo->neg_node = 1; |
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| 344 | ao->accept_network = 1; |
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| 345 | } |
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| 346 | /* |
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| 347 | * If our node number is zero then change it. |
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| 348 | */ |
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| 349 | if (zero_node (wo->our_node)) { |
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| 350 | inc_node (wo->our_node); |
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| 351 | ao->accept_local = 1; |
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| 352 | wo->neg_node = 1; |
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| 353 | } |
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| 354 | /* |
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| 355 | * If his node number is zero then change it. |
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| 356 | */ |
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| 357 | if (zero_node (wo->his_node)) { |
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| 358 | inc_node (wo->his_node); |
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| 359 | ao->accept_remote = 1; |
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| 360 | } |
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| 361 | /* |
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| 362 | * If no routing agent was specified then we do RIP/SAP according to the |
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| 363 | * RFC documents. If you have specified something then OK. Otherwise, we |
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| 364 | * do RIP/SAP. |
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| 365 | */ |
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| 366 | if (ao->router == 0) { |
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| 367 | ao->router |= BIT(RIP_SAP); |
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| 368 | wo->router |= BIT(RIP_SAP); |
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| 369 | } |
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| 370 | |
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| 371 | /* Always specify a routing protocol unless it was REJected. */ |
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| 372 | wo->neg_router = 1; |
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| 373 | /* |
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| 374 | * Start with these default values |
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| 375 | */ |
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| 376 | *go = *wo; |
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| 377 | } |
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| 378 | |
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| 379 | /* |
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| 380 | * ipxcp_cilen - Return length of our CI. |
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| 381 | */ |
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| 382 | |
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| 383 | static int |
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| 384 | ipxcp_cilen(f) |
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| 385 | fsm *f; |
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| 386 | { |
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| 387 | int len; |
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| 388 | |
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| 389 | len = go->neg_nn ? CILEN_NETN : 0; |
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| 390 | len += go->neg_node ? CILEN_NODEN : 0; |
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| 391 | len += go->neg_name ? CILEN_NAME + strlen (go->name) - 1 : 0; |
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| 392 | |
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| 393 | /* RFC says that defaults should not be included. */ |
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| 394 | if (go->neg_router && to_external(go->router) != RIP_SAP) |
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| 395 | len += CILEN_PROTOCOL; |
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| 396 | |
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| 397 | return (len); |
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| 398 | } |
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| 399 | |
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| 400 | |
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| 401 | /* |
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| 402 | * ipxcp_addci - Add our desired CIs to a packet. |
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| 403 | */ |
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| 404 | static void |
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| 405 | ipxcp_addci(f, ucp, lenp) |
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| 406 | fsm *f; |
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| 407 | u_char *ucp; |
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| 408 | int *lenp; |
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| 409 | { |
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| 410 | /* |
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| 411 | * Add the options to the record. |
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| 412 | */ |
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| 413 | if (go->neg_nn) { |
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| 414 | PUTCHAR (IPX_NETWORK_NUMBER, ucp); |
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| 415 | PUTCHAR (CILEN_NETN, ucp); |
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| 416 | PUTLONG (go->our_network, ucp); |
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| 417 | } |
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| 418 | |
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| 419 | if (go->neg_node) { |
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| 420 | int indx; |
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| 421 | PUTCHAR (IPX_NODE_NUMBER, ucp); |
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| 422 | PUTCHAR (CILEN_NODEN, ucp); |
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| 423 | for (indx = 0; indx < sizeof (go->our_node); ++indx) |
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| 424 | PUTCHAR (go->our_node[indx], ucp); |
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| 425 | } |
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| 426 | |
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| 427 | if (go->neg_name) { |
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| 428 | int cilen = strlen (go->name); |
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| 429 | int indx; |
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| 430 | PUTCHAR (IPX_ROUTER_NAME, ucp); |
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| 431 | PUTCHAR (CILEN_NAME + cilen - 1, ucp); |
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| 432 | for (indx = 0; indx < cilen; ++indx) |
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| 433 | PUTCHAR (go->name [indx], ucp); |
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| 434 | } |
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| 435 | |
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| 436 | if (go->neg_router) { |
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| 437 | short external = to_external (go->router); |
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| 438 | if (external != RIP_SAP) { |
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| 439 | PUTCHAR (IPX_ROUTER_PROTOCOL, ucp); |
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| 440 | PUTCHAR (CILEN_PROTOCOL, ucp); |
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| 441 | PUTSHORT (external, ucp); |
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| 442 | } |
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| 443 | } |
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| 444 | } |
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| 445 | |
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| 446 | /* |
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| 447 | * ipxcp_ackci - Ack our CIs. |
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| 448 | * |
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| 449 | * Returns: |
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| 450 | * 0 - Ack was bad. |
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| 451 | * 1 - Ack was good. |
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| 452 | */ |
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| 453 | static int |
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| 454 | ipxcp_ackci(f, p, len) |
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| 455 | fsm *f; |
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| 456 | u_char *p; |
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| 457 | int len; |
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| 458 | { |
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| 459 | u_short cilen, citype, cishort; |
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| 460 | u_char cichar; |
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| 461 | u_int32_t cilong; |
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| 462 | |
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| 463 | #define ACKCIVOID(opt, neg) \ |
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| 464 | if (neg) { \ |
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| 465 | if ((len -= CILEN_VOID) < 0) \ |
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| 466 | break; \ |
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| 467 | GETCHAR(citype, p); \ |
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| 468 | GETCHAR(cilen, p); \ |
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| 469 | if (cilen != CILEN_VOID || \ |
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| 470 | citype != opt) \ |
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| 471 | break; \ |
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| 472 | } |
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| 473 | |
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| 474 | #define ACKCICOMPLETE(opt,neg) ACKCIVOID(opt, neg) |
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| 475 | |
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| 476 | #define ACKCICHARS(opt, neg, val, cnt) \ |
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| 477 | if (neg) { \ |
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| 478 | int indx, count = cnt; \ |
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| 479 | len -= (count + 2); \ |
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| 480 | if (len < 0) \ |
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| 481 | break; \ |
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| 482 | GETCHAR(citype, p); \ |
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| 483 | GETCHAR(cilen, p); \ |
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| 484 | if (cilen != (count + 2) || \ |
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| 485 | citype != opt) \ |
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| 486 | break; \ |
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| 487 | for (indx = 0; indx < count; ++indx) {\ |
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| 488 | GETCHAR(cichar, p); \ |
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| 489 | if (cichar != ((u_char *) &val)[indx]) \ |
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| 490 | break; \ |
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| 491 | }\ |
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| 492 | if (indx != count) \ |
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| 493 | break; \ |
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| 494 | } |
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| 495 | |
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| 496 | #define ACKCINODE(opt,neg,val) ACKCICHARS(opt,neg,val,sizeof(val)) |
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| 497 | #define ACKCINAME(opt,neg,val) ACKCICHARS(opt,neg,val,strlen(val)) |
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| 498 | |
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| 499 | #define ACKCINETWORK(opt, neg, val) \ |
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| 500 | if (neg) { \ |
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| 501 | if ((len -= CILEN_NETN) < 0) \ |
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| 502 | break; \ |
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| 503 | GETCHAR(citype, p); \ |
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| 504 | GETCHAR(cilen, p); \ |
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| 505 | if (cilen != CILEN_NETN || \ |
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| 506 | citype != opt) \ |
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| 507 | break; \ |
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| 508 | GETLONG(cilong, p); \ |
---|
| 509 | if (cilong != val) \ |
---|
| 510 | break; \ |
---|
| 511 | } |
---|
| 512 | |
---|
| 513 | #define ACKCIPROTO(opt, neg, val) \ |
---|
| 514 | if (neg) { \ |
---|
| 515 | if (len < 2) \ |
---|
| 516 | break; \ |
---|
| 517 | GETCHAR(citype, p); \ |
---|
| 518 | GETCHAR(cilen, p); \ |
---|
| 519 | if (cilen != CILEN_PROTOCOL || citype != opt) \ |
---|
| 520 | break; \ |
---|
| 521 | len -= cilen; \ |
---|
| 522 | if (len < 0) \ |
---|
| 523 | break; \ |
---|
| 524 | GETSHORT(cishort, p); \ |
---|
| 525 | if (cishort != to_external (val) || cishort == RIP_SAP) \ |
---|
| 526 | break; \ |
---|
| 527 | } |
---|
| 528 | /* |
---|
| 529 | * Process the ACK frame in the order in which the frame was assembled |
---|
| 530 | */ |
---|
| 531 | do { |
---|
| 532 | ACKCINETWORK (IPX_NETWORK_NUMBER, go->neg_nn, go->our_network); |
---|
| 533 | ACKCINODE (IPX_NODE_NUMBER, go->neg_node, go->our_node); |
---|
| 534 | ACKCINAME (IPX_ROUTER_NAME, go->neg_name, go->name); |
---|
| 535 | ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); |
---|
| 536 | ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); |
---|
| 537 | ACKCIPROTO (IPX_ROUTER_PROTOCOL, go->neg_router, go->router); |
---|
| 538 | /* |
---|
| 539 | * This is the end of the record. |
---|
| 540 | */ |
---|
| 541 | if (len == 0) |
---|
| 542 | return (1); |
---|
| 543 | } while (0); |
---|
| 544 | /* |
---|
| 545 | * The frame is invalid |
---|
| 546 | */ |
---|
| 547 | IPXCPDEBUG((LOG_INFO, "ipxcp_ackci: received bad Ack!")); |
---|
| 548 | return (0); |
---|
| 549 | } |
---|
| 550 | |
---|
| 551 | /* |
---|
| 552 | * ipxcp_nakci - Peer has sent a NAK for some of our CIs. |
---|
| 553 | * This should not modify any state if the Nak is bad |
---|
| 554 | * or if IPXCP is in the OPENED state. |
---|
| 555 | * |
---|
| 556 | * Returns: |
---|
| 557 | * 0 - Nak was bad. |
---|
| 558 | * 1 - Nak was good. |
---|
| 559 | */ |
---|
| 560 | |
---|
| 561 | static int |
---|
| 562 | ipxcp_nakci(f, p, len) |
---|
| 563 | fsm *f; |
---|
| 564 | u_char *p; |
---|
| 565 | int len; |
---|
| 566 | { |
---|
| 567 | u_char citype, cilen, *next; |
---|
| 568 | u_short s; |
---|
| 569 | u_int32_t l; |
---|
| 570 | ipxcp_options no; /* options we've seen Naks for */ |
---|
| 571 | ipxcp_options try; /* options to request next time */ |
---|
| 572 | |
---|
| 573 | BZERO(&no, sizeof(no)); |
---|
| 574 | try = *go; |
---|
| 575 | |
---|
| 576 | while (len > CILEN_VOID) { |
---|
| 577 | GETCHAR (citype, p); |
---|
| 578 | GETCHAR (cilen, p); |
---|
| 579 | len -= cilen; |
---|
| 580 | if (len < 0) |
---|
| 581 | goto bad; |
---|
| 582 | next = &p [cilen - CILEN_VOID]; |
---|
| 583 | |
---|
| 584 | switch (citype) { |
---|
| 585 | case IPX_NETWORK_NUMBER: |
---|
| 586 | if (!go->neg_nn || no.neg_nn || (cilen != CILEN_NETN)) |
---|
| 587 | goto bad; |
---|
| 588 | no.neg_nn = 1; |
---|
| 589 | |
---|
| 590 | GETLONG(l, p); |
---|
| 591 | IPXCPDEBUG((LOG_INFO, "local IP address %d", l)); |
---|
| 592 | if (l && ao->accept_network) |
---|
| 593 | try.our_network = l; |
---|
| 594 | break; |
---|
| 595 | |
---|
| 596 | case IPX_NODE_NUMBER: |
---|
| 597 | if (!go->neg_node || no.neg_node || (cilen != CILEN_NODEN)) |
---|
| 598 | goto bad; |
---|
| 599 | no.neg_node = 1; |
---|
| 600 | |
---|
| 601 | IPXCPDEBUG((LOG_INFO, |
---|
| 602 | "local node number %02X%02X%02X%02X%02X%02X", |
---|
| 603 | NODE(p))); |
---|
| 604 | |
---|
| 605 | if (!zero_node (p) && ao->accept_local && |
---|
| 606 | ! compare_node (p, ho->his_node)) |
---|
| 607 | copy_node (p, try.our_node); |
---|
| 608 | break; |
---|
| 609 | |
---|
| 610 | /* This has never been sent. Ignore the NAK frame */ |
---|
| 611 | case IPX_COMPRESSION_PROTOCOL: |
---|
| 612 | goto bad; |
---|
| 613 | |
---|
| 614 | case IPX_ROUTER_PROTOCOL: |
---|
| 615 | if (!go->neg_router || (cilen < CILEN_PROTOCOL)) |
---|
| 616 | goto bad; |
---|
| 617 | |
---|
| 618 | GETSHORT (s, p); |
---|
| 619 | if (s > 15) /* This is just bad, but ignore for now. */ |
---|
| 620 | break; |
---|
| 621 | |
---|
| 622 | s = BIT(s); |
---|
| 623 | if (no.router & s) /* duplicate NAKs are always bad */ |
---|
| 624 | goto bad; |
---|
| 625 | |
---|
| 626 | if (no.router == 0) /* Reset on first NAK only */ |
---|
| 627 | try.router = 0; |
---|
| 628 | |
---|
| 629 | no.router |= s; |
---|
| 630 | try.router |= s; |
---|
| 631 | try.neg_router = 1; |
---|
| 632 | |
---|
| 633 | IPXCPDEBUG((LOG_INFO, "Router protocol number %d", s)); |
---|
| 634 | break; |
---|
| 635 | |
---|
| 636 | /* These, according to the RFC, must never be NAKed. */ |
---|
| 637 | case IPX_ROUTER_NAME: |
---|
| 638 | case IPX_COMPLETE: |
---|
| 639 | goto bad; |
---|
| 640 | |
---|
| 641 | /* These are for options which we have not seen. */ |
---|
| 642 | default: |
---|
| 643 | break; |
---|
| 644 | } |
---|
| 645 | p = next; |
---|
| 646 | } |
---|
| 647 | |
---|
| 648 | /* If there is still anything left, this packet is bad. */ |
---|
| 649 | if (len != 0) |
---|
| 650 | goto bad; |
---|
| 651 | |
---|
| 652 | /* |
---|
| 653 | * Do not permit the peer to force a router protocol which we do not |
---|
| 654 | * support. However, default to the condition that will accept "NONE". |
---|
| 655 | */ |
---|
| 656 | try.router &= (ao->router | BIT(IPX_NONE)); |
---|
| 657 | if (try.router == 0 && ao->router != 0) |
---|
| 658 | try.router = BIT(IPX_NONE); |
---|
| 659 | |
---|
| 660 | if (try.router != 0) |
---|
| 661 | try.neg_router = 1; |
---|
| 662 | |
---|
| 663 | /* |
---|
| 664 | * OK, the Nak is good. Now we can update state. |
---|
| 665 | */ |
---|
| 666 | if (f->state != OPENED) |
---|
| 667 | *go = try; |
---|
| 668 | |
---|
| 669 | return 1; |
---|
| 670 | |
---|
| 671 | bad: |
---|
| 672 | IPXCPDEBUG((LOG_INFO, "ipxcp_nakci: received bad Nak!")); |
---|
| 673 | return 0; |
---|
| 674 | } |
---|
| 675 | |
---|
| 676 | /* |
---|
| 677 | * ipxcp_rejci - Reject some of our CIs. |
---|
| 678 | */ |
---|
| 679 | static int |
---|
| 680 | ipxcp_rejci(f, p, len) |
---|
| 681 | fsm *f; |
---|
| 682 | u_char *p; |
---|
| 683 | int len; |
---|
| 684 | { |
---|
| 685 | u_short cilen, citype, cishort; |
---|
| 686 | u_char cichar; |
---|
| 687 | u_int32_t cilong; |
---|
| 688 | ipxcp_options try; /* options to request next time */ |
---|
| 689 | |
---|
| 690 | #define REJCINETWORK(opt, neg, val) \ |
---|
| 691 | if (neg && p[0] == opt) { \ |
---|
| 692 | if ((len -= CILEN_NETN) < 0) \ |
---|
| 693 | break; \ |
---|
| 694 | GETCHAR(citype, p); \ |
---|
| 695 | GETCHAR(cilen, p); \ |
---|
| 696 | if (cilen != CILEN_NETN || \ |
---|
| 697 | citype != opt) \ |
---|
| 698 | break; \ |
---|
| 699 | GETLONG(cilong, p); \ |
---|
| 700 | if (cilong != val) \ |
---|
| 701 | break; \ |
---|
| 702 | IPXCPDEBUG((LOG_INFO,"ipxcp_rejci rejected long opt %d", opt)); \ |
---|
| 703 | neg = 0; \ |
---|
| 704 | } |
---|
| 705 | |
---|
| 706 | #define REJCICHARS(opt, neg, val, cnt) \ |
---|
| 707 | if (neg && p[0] == opt) { \ |
---|
| 708 | int indx, count = cnt; \ |
---|
| 709 | len -= (count + 2); \ |
---|
| 710 | if (len < 0) \ |
---|
| 711 | break; \ |
---|
| 712 | GETCHAR(citype, p); \ |
---|
| 713 | GETCHAR(cilen, p); \ |
---|
| 714 | if (cilen != (count + 2) || \ |
---|
| 715 | citype != opt) \ |
---|
| 716 | break; \ |
---|
| 717 | for (indx = 0; indx < count; ++indx) {\ |
---|
| 718 | GETCHAR(cichar, p); \ |
---|
| 719 | if (cichar != ((u_char *) &val)[indx]) \ |
---|
| 720 | break; \ |
---|
| 721 | }\ |
---|
| 722 | if (indx != count) \ |
---|
| 723 | break; \ |
---|
| 724 | IPXCPDEBUG((LOG_INFO,"ipxcp_rejci rejected opt %d", opt)); \ |
---|
| 725 | neg = 0; \ |
---|
| 726 | } |
---|
| 727 | |
---|
| 728 | #define REJCINODE(opt,neg,val) REJCICHARS(opt,neg,val,sizeof(val)) |
---|
| 729 | #define REJCINAME(opt,neg,val) REJCICHARS(opt,neg,val,strlen(val)) |
---|
| 730 | |
---|
| 731 | #define REJCIVOID(gpt, neg! \ |
---|
| 732 | if (neg && p[0] == opt) { \ |
---|
| 733 | if ((len -= CILEN_VOID) < 0) \ |
---|
| 734 | break; \ |
---|
| 735 | GETCHAR(citype, p); \ |
---|
| 736 | GETCHAR(cilen, p); \ |
---|
| 737 | if (cilen != CILEN_VOID || citype != opt) \ |
---|
| 738 | break; \ |
---|
| 739 | IPXCPDEBUG((LOG_INFO, "ipxcp_rejci rejected void opt %d", opt)); \ |
---|
| 740 | neg = 0; \ |
---|
| 741 | } |
---|
| 742 | |
---|
| 743 | /* a reject for RIP/SAP is invalid since we don't send it and you can't |
---|
| 744 | reject something which is not sent. (You can NAK, but you can't REJ.) */ |
---|
| 745 | #define REJCIPROTO(opt, neg, val, bit) \ |
---|
| 746 | if (neg && p[0] == opt) { \ |
---|
| 747 | if ((len -= CILEN_PROTOCOL) < 0) \ |
---|
| 748 | break; \ |
---|
| 749 | GETCHAR(citype, p); \ |
---|
| 750 | GETCHAR(cilen, p); \ |
---|
| 751 | if (cilen != CILEN_PROTOCOL) \ |
---|
| 752 | break; \ |
---|
| 753 | GETSHORT(cishort, p); \ |
---|
| 754 | if (cishort != to_external (val) || cishort == RIP_SAP) \ |
---|
| 755 | break; \ |
---|
| 756 | IPXCPDEBUG((LOG_INFO, "ipxcp_rejci short opt %d", opt)); \ |
---|
| 757 | neg = 0; \ |
---|
| 758 | } |
---|
| 759 | /* |
---|
| 760 | * Any Rejected CIs must be in exactly the same order that we sent. |
---|
| 761 | * Check packet length and CI length at each step. |
---|
| 762 | * If we find any deviations, then this packet is bad. |
---|
| 763 | */ |
---|
| 764 | try = *go; |
---|
| 765 | |
---|
| 766 | do { |
---|
| 767 | REJCINETWORK (IPX_NETWORK_NUMBER, try.neg_nn, try.our_network); |
---|
| 768 | REJCINODE (IPX_NODE_NUMBER, try.neg_node, try.our_node); |
---|
| 769 | REJCINAME (IPX_ROUTER_NAME, try.neg_name, try.name); |
---|
| 770 | REJCIPROTO (IPX_ROUTER_PROTOCOL, try.neg_router, try.router, 0); |
---|
| 771 | /* |
---|
| 772 | * This is the end of the record. |
---|
| 773 | */ |
---|
| 774 | if (len == 0) { |
---|
| 775 | if (f->state != OPENED) |
---|
| 776 | *go = try; |
---|
| 777 | return (1); |
---|
| 778 | } |
---|
| 779 | } while (0); |
---|
| 780 | /* |
---|
| 781 | * The frame is invalid at this point. |
---|
| 782 | */ |
---|
| 783 | IPXCPDEBUG((LOG_INFO, "ipxcp_rejci: received bad Reject!")); |
---|
| 784 | return 0; |
---|
| 785 | } |
---|
| 786 | |
---|
| 787 | /* |
---|
| 788 | * ipxcp_reqci - Check the peer's requested CIs and send appropriate response. |
---|
| 789 | * |
---|
| 790 | * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified |
---|
| 791 | * appropriately. If reject_if_disagree is non-zero, doesn't return |
---|
| 792 | * CONFNAK; returns CONFREJ if it can't return CONFACK. |
---|
| 793 | */ |
---|
| 794 | static int |
---|
| 795 | ipxcp_reqci(f, inp, len, reject_if_disagree) |
---|
| 796 | fsm *f; |
---|
| 797 | u_char *inp; /* Requested CIs */ |
---|
| 798 | int *len; /* Length of requested CIs */ |
---|
| 799 | int reject_if_disagree; |
---|
| 800 | { |
---|
| 801 | u_char *cip, *next; /* Pointer to current and next CIs */ |
---|
| 802 | u_short cilen, citype; /* Parsed len, type */ |
---|
| 803 | u_short cishort; /* Parsed short value */ |
---|
| 804 | u_int32_t cinetwork; /* Parsed address values */ |
---|
| 805 | int rc = CONFACK; /* Final packet return code */ |
---|
| 806 | int orc; /* Individual option return code */ |
---|
| 807 | u_char *p; /* Pointer to next char to parse */ |
---|
| 808 | u_char *ucp = inp; /* Pointer to current output char */ |
---|
| 809 | int l = *len; /* Length left */ |
---|
| 810 | |
---|
| 811 | /* |
---|
| 812 | * Reset all his options. |
---|
| 813 | */ |
---|
| 814 | BZERO(ho, sizeof(*ho)); |
---|
| 815 | |
---|
| 816 | /* |
---|
| 817 | * Process all his options. |
---|
| 818 | */ |
---|
| 819 | next = inp; |
---|
| 820 | while (l) { |
---|
| 821 | orc = CONFACK; /* Assume success */ |
---|
| 822 | cip = p = next; /* Remember begining of CI */ |
---|
| 823 | if (l < 2 || /* Not enough data for CI header or */ |
---|
| 824 | p[1] < 2 || /* CI length too small or */ |
---|
| 825 | p[1] > l) { /* CI length too big? */ |
---|
| 826 | IPXCPDEBUG((LOG_INFO, "ipxcp_reqci: bad CI length!")); |
---|
| 827 | orc = CONFREJ; /* Reject bad CI */ |
---|
| 828 | cilen = l; /* Reject till end of packet */ |
---|
| 829 | l = 0; /* Don't loop again */ |
---|
| 830 | goto endswitch; |
---|
| 831 | } |
---|
| 832 | GETCHAR(citype, p); /* Parse CI type */ |
---|
| 833 | GETCHAR(cilen, p); /* Parse CI length */ |
---|
| 834 | l -= cilen; /* Adjust remaining length */ |
---|
| 835 | next += cilen; /* Step to next CI */ |
---|
| 836 | |
---|
| 837 | switch (citype) { /* Check CI type */ |
---|
| 838 | /* |
---|
| 839 | * The network number must match. Choose the larger of the two. |
---|
| 840 | */ |
---|
| 841 | case IPX_NETWORK_NUMBER: |
---|
| 842 | IPXCPDEBUG((LOG_INFO, "ipxcp: received Network Number request")); |
---|
| 843 | |
---|
| 844 | /* if we wont negotiate the network number or the length is wrong |
---|
| 845 | then reject the option */ |
---|
| 846 | if ( !ao->neg_nn || cilen != CILEN_NETN ) { |
---|
| 847 | orc = CONFREJ; |
---|
| 848 | break; |
---|
| 849 | } |
---|
| 850 | GETLONG(cinetwork, p); |
---|
| 851 | IPXCPDEBUG((LOG_INFO,"Remote proposed IPX network number is %8Lx",tl)); |
---|
| 852 | |
---|
| 853 | /* If the network numbers match then acknowledge them. */ |
---|
| 854 | if (cinetwork != 0) { |
---|
| 855 | ho->his_network = cinetwork; |
---|
| 856 | ho->neg_nn = 1; |
---|
| 857 | if (wo->our_network == cinetwork) |
---|
| 858 | break; |
---|
| 859 | /* |
---|
| 860 | * If the network number is not given or we don't accept their change or |
---|
| 861 | * the network number is too small then NAK it. |
---|
| 862 | */ |
---|
| 863 | if (! ao->accept_network || cinetwork < wo->our_network) { |
---|
| 864 | DECPTR (sizeof (u_int32_t), p); |
---|
| 865 | PUTLONG (wo->our_network, p); |
---|
| 866 | orc = CONFNAK; |
---|
| 867 | } |
---|
| 868 | break; |
---|
| 869 | } |
---|
| 870 | /* |
---|
| 871 | * The peer sent '0' for the network. Give it ours if we have one. |
---|
| 872 | */ |
---|
| 873 | if (go->our_network != 0) { |
---|
| 874 | DECPTR (sizeof (u_int32_t), p); |
---|
| 875 | PUTLONG (wo->our_network, p); |
---|
| 876 | orc = CONFNAK; |
---|
| 877 | /* |
---|
| 878 | * We don't have one. Reject the value. |
---|
| 879 | */ |
---|
| 880 | } else |
---|
| 881 | orc = CONFREJ; |
---|
| 882 | |
---|
| 883 | break; |
---|
| 884 | /* |
---|
| 885 | * The node number is required |
---|
| 886 | */ |
---|
| 887 | case IPX_NODE_NUMBER: |
---|
| 888 | IPXCPDEBUG((LOG_INFO, "ipxcp: received Node Number request")); |
---|
| 889 | |
---|
| 890 | /* if we wont negotiate the node number or the length is wrong |
---|
| 891 | then reject the option */ |
---|
| 892 | if ( cilen != CILEN_NODEN ) { |
---|
| 893 | orc = CONFREJ; |
---|
| 894 | break; |
---|
| 895 | } |
---|
| 896 | |
---|
| 897 | copy_node (p, ho->his_node); |
---|
| 898 | ho->neg_node = 1; |
---|
| 899 | /* |
---|
| 900 | * If the remote does not have a number and we do then NAK it with the value |
---|
| 901 | * which we have for it. (We never have a default value of zero.) |
---|
| 902 | */ |
---|
| 903 | if (zero_node (ho->his_node)) { |
---|
| 904 | orc = CONFNAK; |
---|
| 905 | copy_node (wo->his_node, p); |
---|
| 906 | INCPTR (sizeof (wo->his_node), p); |
---|
| 907 | break; |
---|
| 908 | } |
---|
| 909 | /* |
---|
| 910 | * If you have given me the expected network node number then I'll accept |
---|
| 911 | * it now. |
---|
| 912 | */ |
---|
| 913 | if (compare_node (wo->his_node, ho->his_node)) { |
---|
| 914 | orc = CONFACK; |
---|
| 915 | ho->neg_node = 1; |
---|
| 916 | INCPTR (sizeof (wo->his_node), p); |
---|
| 917 | break; |
---|
| 918 | } |
---|
| 919 | /* |
---|
| 920 | * If his node number is the same as ours then ask him to try the next |
---|
| 921 | * value. |
---|
| 922 | */ |
---|
| 923 | if (compare_node (ho->his_node, go->our_node)) { |
---|
| 924 | inc_node (ho->his_node); |
---|
| 925 | orc = CONFNAK; |
---|
| 926 | copy_node (ho->his_node, p); |
---|
| 927 | INCPTR (sizeof (wo->his_node), p); |
---|
| 928 | break; |
---|
| 929 | } |
---|
| 930 | /* |
---|
| 931 | * If we don't accept a new value then NAK it. |
---|
| 932 | */ |
---|
| 933 | if (! ao->accept_remote) { |
---|
| 934 | copy_node (wo->his_node, p); |
---|
| 935 | INCPTR (sizeof (wo->his_node), p); |
---|
| 936 | orc = CONFNAK; |
---|
| 937 | break; |
---|
| 938 | } |
---|
| 939 | orc = CONFACK; |
---|
| 940 | ho->neg_node = 1; |
---|
| 941 | INCPTR (sizeof (wo->his_node), p); |
---|
| 942 | break; |
---|
| 943 | /* |
---|
| 944 | * Compression is not desired at this time. It is always rejected. |
---|
| 945 | */ |
---|
| 946 | case IPX_COMPRESSION_PROTOCOL: |
---|
| 947 | IPXCPDEBUG((LOG_INFO, "ipxcp: received Compression Protocol request ")); |
---|
| 948 | orc = CONFREJ; |
---|
| 949 | break; |
---|
| 950 | /* |
---|
| 951 | * The routing protocol is a bitmask of various types. Any combination |
---|
| 952 | * of the values RIP_SAP and NLSP are permissible. 'IPX_NONE' for no |
---|
| 953 | * routing protocol must be specified only once. |
---|
| 954 | */ |
---|
| 955 | case IPX_ROUTER_PROTOCOL: |
---|
| 956 | if ( !ao->neg_router || cilen < CILEN_PROTOCOL ) { |
---|
| 957 | orc = CONFREJ; |
---|
| 958 | break; |
---|
| 959 | } |
---|
| 960 | |
---|
| 961 | GETSHORT (cishort, p); |
---|
| 962 | IPXCPDEBUG((LOG_INFO, |
---|
| 963 | "Remote router protocol number 0x%04x", |
---|
| 964 | cishort)); |
---|
| 965 | |
---|
| 966 | if (wo->neg_router == 0) { |
---|
| 967 | wo->neg_router = 1; |
---|
| 968 | wo->router = BIT(IPX_NONE); |
---|
| 969 | } |
---|
| 970 | |
---|
| 971 | if ((cishort == IPX_NONE && ho->router != 0) || |
---|
| 972 | (ho->router & BIT(IPX_NONE))) { |
---|
| 973 | orc = CONFREJ; |
---|
| 974 | break; |
---|
| 975 | } |
---|
| 976 | |
---|
| 977 | cishort = BIT(cishort); |
---|
| 978 | if (ho->router & cishort) { |
---|
| 979 | orc = CONFREJ; |
---|
| 980 | break; |
---|
| 981 | } |
---|
| 982 | |
---|
| 983 | ho->router |= cishort; |
---|
| 984 | ho->neg_router = 1; |
---|
| 985 | |
---|
| 986 | /* Finally do not allow a router protocol which we do not |
---|
| 987 | support. */ |
---|
| 988 | |
---|
| 989 | if ((cishort & (ao->router | BIT(IPX_NONE))) == 0) { |
---|
| 990 | int protocol; |
---|
| 991 | |
---|
| 992 | if (cishort == BIT(NLSP) && |
---|
| 993 | (ao->router & BIT(RIP_SAP)) && |
---|
| 994 | !wo->tried_rip) { |
---|
| 995 | protocol = RIP_SAP; |
---|
| 996 | wo->tried_rip = 1; |
---|
| 997 | } else |
---|
| 998 | protocol = IPX_NONE; |
---|
| 999 | |
---|
| 1000 | DECPTR (sizeof (u_int16_t), p); |
---|
| 1001 | PUTSHORT (protocol, p); |
---|
| 1002 | orc = CONFNAK; |
---|
| 1003 | } |
---|
| 1004 | break; |
---|
| 1005 | /* |
---|
| 1006 | * The router name is advisorary. Just accept it if it is not too large. |
---|
| 1007 | */ |
---|
| 1008 | case IPX_ROUTER_NAME: |
---|
| 1009 | IPXCPDEBUG((LOG_INFO, "ipxcp: received Router Name request")); |
---|
| 1010 | if (cilen >= CILEN_NAME) { |
---|
| 1011 | int name_size = cilen - CILEN_NAME; |
---|
| 1012 | if (name_size > sizeof (ho->name)) |
---|
| 1013 | name_size = sizeof (ho->name) - 1; |
---|
| 1014 | memset (ho->name, 0, sizeof (ho->name)); |
---|
| 1015 | memcpy (ho->name, p, name_size); |
---|
| 1016 | ho->name [name_size] = '\0'; |
---|
| 1017 | ho->neg_name = 1; |
---|
| 1018 | orc = CONFACK; |
---|
| 1019 | break; |
---|
| 1020 | } |
---|
| 1021 | orc = CONFREJ; |
---|
| 1022 | break; |
---|
| 1023 | /* |
---|
| 1024 | * This is advisorary. |
---|
| 1025 | */ |
---|
| 1026 | case IPX_COMPLETE: |
---|
| 1027 | IPXCPDEBUG((LOG_INFO, "ipxcp: received Complete request")); |
---|
| 1028 | if (cilen != CILEN_COMPLETE) |
---|
| 1029 | orc = CONFREJ; |
---|
| 1030 | else { |
---|
| 1031 | ho->neg_complete = 1; |
---|
| 1032 | orc = CONFACK; |
---|
| 1033 | } |
---|
| 1034 | break; |
---|
| 1035 | /* |
---|
| 1036 | * All other entries are not known at this time. |
---|
| 1037 | */ |
---|
| 1038 | default: |
---|
| 1039 | IPXCPDEBUG((LOG_INFO, "ipxcp: received Complete request")); |
---|
| 1040 | orc = CONFREJ; |
---|
| 1041 | break; |
---|
| 1042 | } |
---|
| 1043 | |
---|
| 1044 | endswitch: |
---|
| 1045 | IPXCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc))); |
---|
| 1046 | |
---|
| 1047 | if (orc == CONFACK && /* Good CI */ |
---|
| 1048 | rc != CONFACK) /* but prior CI wasnt? */ |
---|
| 1049 | continue; /* Don't send this one */ |
---|
| 1050 | |
---|
| 1051 | if (orc == CONFNAK) { /* Nak this CI? */ |
---|
| 1052 | if (reject_if_disagree) /* Getting fed up with sending NAKs? */ |
---|
| 1053 | orc = CONFREJ; /* Get tough if so */ |
---|
| 1054 | if (rc == CONFREJ) /* Rejecting prior CI? */ |
---|
| 1055 | continue; /* Don't send this one */ |
---|
| 1056 | if (rc == CONFACK) { /* Ack'd all prior CIs? */ |
---|
| 1057 | rc = CONFNAK; /* Not anymore... */ |
---|
| 1058 | ucp = inp; /* Backup */ |
---|
| 1059 | } |
---|
| 1060 | } |
---|
| 1061 | |
---|
| 1062 | if (orc == CONFREJ && /* Reject this CI */ |
---|
| 1063 | rc != CONFREJ) { /* but no prior ones? */ |
---|
| 1064 | rc = CONFREJ; |
---|
| 1065 | ucp = inp; /* Backup */ |
---|
| 1066 | } |
---|
| 1067 | |
---|
| 1068 | /* Need to move CI? */ |
---|
| 1069 | if (ucp != cip) |
---|
| 1070 | BCOPY(cip, ucp, cilen); /* Move it */ |
---|
| 1071 | |
---|
| 1072 | /* Update output pointer */ |
---|
| 1073 | INCPTR(cilen, ucp); |
---|
| 1074 | } |
---|
| 1075 | |
---|
| 1076 | /* |
---|
| 1077 | * If we aren't rejecting this packet, and we want to negotiate |
---|
| 1078 | * their address, and they didn't send their address, then we |
---|
| 1079 | * send a NAK with a IPX_NODE_NUMBER option appended. We assume the |
---|
| 1080 | * input buffer is long enough that we can append the extra |
---|
| 1081 | * option safely. |
---|
| 1082 | */ |
---|
| 1083 | |
---|
| 1084 | if (rc != CONFREJ && !ho->neg_node && |
---|
| 1085 | wo->req_nn && !reject_if_disagree) { |
---|
| 1086 | if (rc == CONFACK) { |
---|
| 1087 | rc = CONFNAK; |
---|
| 1088 | wo->req_nn = 0; /* don't ask again */ |
---|
| 1089 | ucp = inp; /* reset pointer */ |
---|
| 1090 | } |
---|
| 1091 | |
---|
| 1092 | if (zero_node (wo->his_node)) |
---|
| 1093 | inc_node (wo->his_node); |
---|
| 1094 | |
---|
| 1095 | PUTCHAR (IPX_NODE_NUMBER, ucp); |
---|
| 1096 | PUTCHAR (CILEN_NODEN, ucp); |
---|
| 1097 | copy_node (wo->his_node, ucp); |
---|
| 1098 | INCPTR (sizeof (wo->his_node), ucp); |
---|
| 1099 | } |
---|
| 1100 | |
---|
| 1101 | *len = ucp - inp; /* Compute output length */ |
---|
| 1102 | IPXCPDEBUG((LOG_INFO, "ipxcp: returning Configure-%s", CODENAME(rc))); |
---|
| 1103 | return (rc); /* Return final code */ |
---|
| 1104 | } |
---|
| 1105 | |
---|
| 1106 | /* |
---|
| 1107 | * ipxcp_up - IPXCP has come UP. |
---|
| 1108 | * |
---|
| 1109 | * Configure the IP network interface appropriately and bring it up. |
---|
| 1110 | */ |
---|
| 1111 | |
---|
| 1112 | static void |
---|
| 1113 | ipxcp_up(f) |
---|
| 1114 | fsm *f; |
---|
| 1115 | { |
---|
| 1116 | int unit = f->unit; |
---|
| 1117 | |
---|
| 1118 | IPXCPDEBUG((LOG_INFO, "ipxcp: up")); |
---|
| 1119 | |
---|
| 1120 | /* The default router protocol is RIP/SAP. */ |
---|
| 1121 | if (ho->router == 0) |
---|
| 1122 | ho->router = BIT(RIP_SAP); |
---|
| 1123 | |
---|
| 1124 | if (go->router == 0) |
---|
| 1125 | go->router = BIT(RIP_SAP); |
---|
| 1126 | |
---|
| 1127 | /* Fetch the network number */ |
---|
| 1128 | if (!ho->neg_nn) |
---|
| 1129 | ho->his_network = wo->his_network; |
---|
| 1130 | |
---|
| 1131 | if (!ho->neg_node) |
---|
| 1132 | copy_node (wo->his_node, ho->his_node); |
---|
| 1133 | |
---|
| 1134 | if (!wo->neg_node && !go->neg_node) |
---|
| 1135 | copy_node (wo->our_node, go->our_node); |
---|
| 1136 | |
---|
| 1137 | if (zero_node (go->our_node)) { |
---|
| 1138 | static char errmsg[] = "Could not determine local IPX node address"; |
---|
| 1139 | IPXCPDEBUG((LOG_ERR, errmsg)); |
---|
| 1140 | ipxcp_close(f->unit, errmsg); |
---|
| 1141 | return; |
---|
| 1142 | } |
---|
| 1143 | |
---|
| 1144 | go->network = go->our_network; |
---|
| 1145 | if (ho->his_network != 0 && ho->his_network > go->network) |
---|
| 1146 | go->network = ho->his_network; |
---|
| 1147 | |
---|
| 1148 | if (go->network == 0) { |
---|
| 1149 | static char errmsg[] = "Can not determine network number"; |
---|
| 1150 | IPXCPDEBUG((LOG_ERR, errmsg)); |
---|
| 1151 | ipxcp_close (unit, errmsg); |
---|
| 1152 | return; |
---|
| 1153 | } |
---|
| 1154 | |
---|
| 1155 | /* bring the interface up */ |
---|
| 1156 | if (!sifup(unit)) { |
---|
| 1157 | IPXCPDEBUG((LOG_WARNING, "sifup failed")); |
---|
| 1158 | ipxcp_close(unit, "Interface configuration failed"); |
---|
| 1159 | return; |
---|
| 1160 | } |
---|
| 1161 | |
---|
| 1162 | /* set the network number for IPX */ |
---|
| 1163 | if (!sipxfaddr(unit, go->network, go->our_node)) { |
---|
| 1164 | IPXCPDEBUG((LOG_WARNING, "sipxfaddr failed")); |
---|
| 1165 | ipxcp_close(unit, "Interface configuration failed"); |
---|
| 1166 | return; |
---|
| 1167 | } |
---|
| 1168 | |
---|
| 1169 | /* |
---|
| 1170 | * Execute the ipx-up script, like this: |
---|
| 1171 | * /etc/ppp/ipx-up interface tty speed local-IPX remote-IPX |
---|
| 1172 | */ |
---|
| 1173 | |
---|
| 1174 | ipxcp_script (f, _PATH_IPXUP); |
---|
| 1175 | } |
---|
| 1176 | |
---|
| 1177 | /* |
---|
| 1178 | * ipxcp_down - IPXCP has gone DOWN. |
---|
| 1179 | * |
---|
| 1180 | * Take the IP network interface down, clear its addresses |
---|
| 1181 | * and delete routes through it. |
---|
| 1182 | */ |
---|
| 1183 | |
---|
| 1184 | static void |
---|
| 1185 | ipxcp_down(f) |
---|
| 1186 | fsm *f; |
---|
| 1187 | { |
---|
| 1188 | IPXCPDEBUG((LOG_INFO, "ipxcp: down")); |
---|
| 1189 | |
---|
| 1190 | cipxfaddr (f->unit); |
---|
| 1191 | sifdown(f->unit); |
---|
| 1192 | ipxcp_script (f, _PATH_IPXDOWN); |
---|
| 1193 | } |
---|
| 1194 | |
---|
| 1195 | |
---|
| 1196 | /* |
---|
| 1197 | * ipxcp_script - Execute a script with arguments |
---|
| 1198 | * interface-name tty-name speed local-IPX remote-IPX networks. |
---|
| 1199 | */ |
---|
| 1200 | static void |
---|
| 1201 | ipxcp_script(f, script) |
---|
| 1202 | fsm *f; |
---|
| 1203 | char *script; |
---|
| 1204 | { |
---|
| 1205 | char strspeed[32], strlocal[32], strremote[32]; |
---|
| 1206 | char strnetwork[32], strpid[32]; |
---|
| 1207 | char *argv[14], strproto_lcl[32], strproto_rmt[32]; |
---|
| 1208 | |
---|
| 1209 | sprintf (strpid, "%d", getpid()); |
---|
| 1210 | sprintf (strspeed, "%d", baud_rate); |
---|
| 1211 | |
---|
| 1212 | strproto_lcl[0] = '\0'; |
---|
| 1213 | if (go->neg_router && ((go->router & BIT(IPX_NONE)) == 0)) { |
---|
| 1214 | if (go->router & BIT(RIP_SAP)) |
---|
| 1215 | strcpy (strproto_lcl, "RIP "); |
---|
| 1216 | if (go->router & BIT(NLSP)) |
---|
| 1217 | strcat (strproto_lcl, "NLSP "); |
---|
| 1218 | } |
---|
| 1219 | |
---|
| 1220 | if (strproto_lcl[0] == '\0') |
---|
| 1221 | strcpy (strproto_lcl, "NONE "); |
---|
| 1222 | |
---|
| 1223 | strproto_lcl[strlen (strproto_lcl)-1] = '\0'; |
---|
| 1224 | |
---|
| 1225 | strproto_rmt[0] = '\0'; |
---|
| 1226 | if (ho->neg_router && ((ho->router & BIT(IPX_NONE)) == 0)) { |
---|
| 1227 | if (ho->router & BIT(RIP_SAP)) |
---|
| 1228 | strcpy (strproto_rmt, "RIP "); |
---|
| 1229 | if (ho->router & BIT(NLSP)) |
---|
| 1230 | strcat (strproto_rmt, "NLSP "); |
---|
| 1231 | } |
---|
| 1232 | |
---|
| 1233 | if (strproto_rmt[0] == '\0') |
---|
| 1234 | strcpy (strproto_rmt, "NONE "); |
---|
| 1235 | |
---|
| 1236 | strproto_rmt[strlen (strproto_rmt)-1] = '\0'; |
---|
| 1237 | |
---|
| 1238 | strcpy (strnetwork, ipx_ntoa (go->network)); |
---|
| 1239 | |
---|
| 1240 | sprintf (strlocal, |
---|
| 1241 | "%02X%02X%02X%02X%02X%02X", |
---|
| 1242 | NODE(go->our_node)); |
---|
| 1243 | |
---|
| 1244 | sprintf (strremote, |
---|
| 1245 | "%02X%02X%02X%02X%02X%02X", |
---|
| 1246 | NODE(ho->his_node)); |
---|
| 1247 | |
---|
| 1248 | argv[0] = script; |
---|
| 1249 | argv[1] = ifname; |
---|
| 1250 | argv[2] = devnam; |
---|
| 1251 | argv[3] = strspeed; |
---|
| 1252 | argv[4] = strnetwork; |
---|
| 1253 | argv[5] = strlocal; |
---|
| 1254 | argv[6] = strremote; |
---|
| 1255 | argv[7] = strproto_lcl; |
---|
| 1256 | argv[8] = strproto_rmt; |
---|
| 1257 | argv[9] = go->name; |
---|
| 1258 | argv[10] = ho->name; |
---|
| 1259 | argv[11] = ipparam; |
---|
| 1260 | argv[12] = strpid; |
---|
| 1261 | argv[13] = NULL; |
---|
| 1262 | run_program(script, argv, 0); |
---|
| 1263 | } |
---|
| 1264 | |
---|
| 1265 | /* |
---|
| 1266 | * ipxcp_printpkt - print the contents of an IPXCP packet. |
---|
| 1267 | */ |
---|
| 1268 | static char *ipxcp_codenames[] = { |
---|
| 1269 | "ConfReq", "ConfAck", "ConfNak", "ConfRej", |
---|
| 1270 | "TermReq", "TermAck", "CodeRej" |
---|
| 1271 | }; |
---|
| 1272 | |
---|
| 1273 | static int |
---|
| 1274 | ipxcp_printpkt(p, plen, printer, arg) |
---|
| 1275 | u_char *p; |
---|
| 1276 | int plen; |
---|
| 1277 | void (*printer) __P((void *, char *, ...)); |
---|
| 1278 | void *arg; |
---|
| 1279 | { |
---|
| 1280 | int code, id, len, olen; |
---|
| 1281 | u_char *pstart, *optend; |
---|
| 1282 | u_short cishort; |
---|
| 1283 | u_int32_t cilong; |
---|
| 1284 | |
---|
| 1285 | if (plen < HEADERLEN) |
---|
| 1286 | return 0; |
---|
| 1287 | pstart = p; |
---|
| 1288 | GETCHAR(code, p); |
---|
| 1289 | GETCHAR(id, p); |
---|
| 1290 | GETSHORT(len, p); |
---|
| 1291 | if (len < HEADERLEN || len > plen) |
---|
| 1292 | return 0; |
---|
| 1293 | |
---|
| 1294 | if (code >= 1 && code <= sizeof(ipxcp_codenames) / sizeof(char *)) |
---|
| 1295 | printer(arg, " %s", ipxcp_codenames[code-1]); |
---|
| 1296 | else |
---|
| 1297 | printer(arg, " code=0x%x", code); |
---|
| 1298 | printer(arg, " id=0x%x", id); |
---|
| 1299 | len -= HEADERLEN; |
---|
| 1300 | switch (code) { |
---|
| 1301 | case CONFREQ: |
---|
| 1302 | case CONFACK: |
---|
| 1303 | case CONFNAK: |
---|
| 1304 | case CONFREJ: |
---|
| 1305 | /* print option list */ |
---|
| 1306 | while (len >= 2) { |
---|
| 1307 | GETCHAR(code, p); |
---|
| 1308 | GETCHAR(olen, p); |
---|
| 1309 | p -= 2; |
---|
| 1310 | if (olen < CILEN_VOID || olen > len) { |
---|
| 1311 | break; |
---|
| 1312 | } |
---|
| 1313 | printer(arg, " <"); |
---|
| 1314 | len -= olen; |
---|
| 1315 | optend = p + olen; |
---|
| 1316 | switch (code) { |
---|
| 1317 | case IPX_NETWORK_NUMBER: |
---|
| 1318 | if (olen == CILEN_NETN) { |
---|
| 1319 | p += 2; |
---|
| 1320 | GETLONG(cilong, p); |
---|
| 1321 | printer (arg, "network %s", ipx_ntoa (cilong)); |
---|
| 1322 | } |
---|
| 1323 | break; |
---|
| 1324 | case IPX_NODE_NUMBER: |
---|
| 1325 | if (olen == CILEN_NODEN) { |
---|
| 1326 | p += 2; |
---|
| 1327 | printer (arg, "node "); |
---|
| 1328 | while (p < optend) { |
---|
| 1329 | GETCHAR(code, p); |
---|
| 1330 | printer(arg, "%.2x", (int) (unsigned int) (unsigned char) code); |
---|
| 1331 | } |
---|
| 1332 | } |
---|
| 1333 | break; |
---|
| 1334 | case IPX_COMPRESSION_PROTOCOL: |
---|
| 1335 | if (olen == CILEN_COMPRESS) { |
---|
| 1336 | p += 2; |
---|
| 1337 | GETSHORT (cishort, p); |
---|
| 1338 | printer (arg, "compression %d", (int) cishort); |
---|
| 1339 | } |
---|
| 1340 | break; |
---|
| 1341 | case IPX_ROUTER_PROTOCOL: |
---|
| 1342 | if (olen == CILEN_PROTOCOL) { |
---|
| 1343 | p += 2; |
---|
| 1344 | GETSHORT (cishort, p); |
---|
| 1345 | printer (arg, "router proto %d", (int) cishort); |
---|
| 1346 | } |
---|
| 1347 | break; |
---|
| 1348 | case IPX_ROUTER_NAME: |
---|
| 1349 | if (olen >= CILEN_NAME) { |
---|
| 1350 | p += 2; |
---|
| 1351 | printer (arg, "router name \""); |
---|
| 1352 | while (p < optend) { |
---|
| 1353 | GETCHAR(code, p); |
---|
| 1354 | if (code >= 0x20 && code <= 0x7E) |
---|
| 1355 | printer (arg, "%c", (int) (unsigned int) (unsigned char) code); |
---|
| 1356 | else |
---|
| 1357 | printer (arg, " \\%.2x", (int) (unsigned int) (unsigned char) code); |
---|
| 1358 | } |
---|
| 1359 | printer (arg, "\""); |
---|
| 1360 | } |
---|
| 1361 | break; |
---|
| 1362 | case IPX_COMPLETE: |
---|
| 1363 | if (olen == CILEN_COMPLETE) { |
---|
| 1364 | p += 2; |
---|
| 1365 | printer (arg, "complete"); |
---|
| 1366 | } |
---|
| 1367 | break; |
---|
| 1368 | default: |
---|
| 1369 | break; |
---|
| 1370 | } |
---|
| 1371 | |
---|
| 1372 | while (p < optend) { |
---|
| 1373 | GETCHAR(code, p); |
---|
| 1374 | printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); |
---|
| 1375 | } |
---|
| 1376 | printer(arg, ">"); |
---|
| 1377 | } |
---|
| 1378 | break; |
---|
| 1379 | |
---|
| 1380 | case TERMACK: |
---|
| 1381 | case TERMREQ: |
---|
| 1382 | if (len > 0 && *p >= ' ' && *p < 0x7f) { |
---|
| 1383 | printer(arg, " "); |
---|
| 1384 | print_string(p, len, printer, arg); |
---|
| 1385 | p += len; |
---|
| 1386 | len = 0; |
---|
| 1387 | } |
---|
| 1388 | break; |
---|
| 1389 | } |
---|
| 1390 | |
---|
| 1391 | /* print the rest of the bytes in the packet */ |
---|
| 1392 | for (; len > 0; --len) { |
---|
| 1393 | GETCHAR(code, p); |
---|
| 1394 | printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code); |
---|
| 1395 | } |
---|
| 1396 | |
---|
| 1397 | return p - pstart; |
---|
| 1398 | } |
---|
| 1399 | #endif /* ifdef IPX_CHANGE */ |
---|