/* * ipcp.c - PPP IP Control Protocol. * * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. * * Copyright (c) 1989 Carnegie Mellon University. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by Carnegie Mellon University. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #define RCSID "$Id: ipcp.c,v 1.54 2000/04/15 01:27:11 masputra Exp $" /* * TODO: */ #include #include #include #include #include #include #if defined(_linux_) || defined(__linux__) #define __FAVOR_BSD #endif #include #include #include #include "pppd.h" #include "fsm.h" #include "ipcp.h" #include "pathnames.h" #if !defined(lint) && !defined(_lint) static const char rcsid[] = RCSID; #endif /* global vars */ ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */ ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ bool ipcp_from_hostname = 0; /* Local IP address is from hostname lookup */ /* Hook for a plugin to know when IP protocol has come up */ void (*ip_up_hook) __P((void)) = NULL; /* Hook for a plugin to know when IP protocol has come down */ void (*ip_down_hook) __P((void)) = NULL; /* local vars */ static bool default_route_set[NUM_PPP]; /* Have set up a default route */ static bool proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */ static bool ipcp_is_up[NUM_PPP]; /* have called np_up() */ static bool proxy_arp_quiet[NUM_PPP]; /* We should be quiet on error */ static bool disable_defaultip = 0; /* Don't use hostname for IP addr */ /* * Callbacks for fsm code. (CI = Configuration Information) */ static void ipcp_resetci __P((fsm *)); /* Reset our CI */ static int ipcp_cilen __P((fsm *)); /* Return length of our CI */ static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */ static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */ static int ipcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */ static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */ static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */ static void ipcp_up __P((fsm *)); /* We're UP */ static void ipcp_down __P((fsm *)); /* We're DOWN */ static void ipcp_finished __P((fsm *)); /* Don't need lower layer */ static int setmsservaddr __P((char *, u_int32_t *)); fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */ static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */ ipcp_resetci, /* Reset our Configuration Information */ ipcp_cilen, /* Length of our Configuration Information */ ipcp_addci, /* Add our Configuration Information */ ipcp_ackci, /* ACK our Configuration Information */ ipcp_nakci, /* NAK our Configuration Information */ ipcp_rejci, /* Reject our Configuration Information */ ipcp_reqci, /* Request peer's Configuration Information */ ipcp_up, /* Called when fsm reaches OPENED state */ ipcp_down, /* Called when fsm leaves OPENED state */ NULL, /* Called when we want the lower layer up */ ipcp_finished, /* Called when we want the lower layer down */ NULL, /* Retransmission is necessary */ NULL, /* Called to handle protocol-specific codes */ "IPCP", /* String name of protocol */ NULL /* Peer rejected a code number */ }; /* * Command-line options. */ static int setvjslots __P((char **)); static int setdnsaddr __P((char **)); static int setwinsaddr __P((char **)); static int autoproxyarp __P((char **)); static option_t ipcp_option_list[] = { { "noip", o_bool, &ipcp_protent.enabled_flag, "Disable IP and IPCP" }, { "-ip", o_bool, &ipcp_protent.enabled_flag, "Disable IP and IPCP" }, { "novj", o_bool, &ipcp_wantoptions[0].neg_vj, "Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj }, { "-vj", o_bool, &ipcp_wantoptions[0].neg_vj, "Disable VJ compression", OPT_A2COPY, &ipcp_allowoptions[0].neg_vj }, { "novjccomp", o_bool, &ipcp_wantoptions[0].cflag, "Disable VJ connection-ID compression", OPT_A2COPY, &ipcp_allowoptions[0].cflag }, { "-vjccomp", o_bool, &ipcp_wantoptions[0].cflag, "Disable VJ connection-ID compression", OPT_A2COPY, &ipcp_allowoptions[0].cflag }, { "vj-max-slots", o_special, (void *)setvjslots, "Set maximum VJ header slots" }, { "ipcp-accept-local", o_bool, &ipcp_wantoptions[0].accept_local, "Accept peer's address for us", 1 }, { "ipcp-accept-remote", o_bool, &ipcp_wantoptions[0].accept_remote, "Accept peer's address for it", 1 }, { "ipparam", o_string, &ipparam, "Set ip script parameter" }, { "noipdefault", o_bool, &disable_defaultip, "Don't use name for default IP adrs", 1 }, { "ms-dns", o_special, (void *)setdnsaddr, "DNS address for the peer's use" }, { "ms-wins", o_special, (void *)setwinsaddr, "Nameserver for SMB over TCP/IP for peer" }, { "ipcp-restart", o_int, &ipcp_fsm[0].timeouttime, "Set timeout for IPCP" }, { "ipcp-max-terminate", o_int, &ipcp_fsm[0].maxtermtransmits, "Set max #xmits for term-reqs" }, { "ipcp-max-configure", o_int, &ipcp_fsm[0].maxconfreqtransmits, "Set max #xmits for conf-reqs" }, { "ipcp-max-failure", o_int, &ipcp_fsm[0].maxnakloops, "Set max #conf-naks for IPCP" }, { "defaultroute", o_bool, &ipcp_wantoptions[0].default_route, "Add default route", OPT_ENABLE|1, &ipcp_allowoptions[0].default_route }, { "nodefaultroute", o_bool, &ipcp_allowoptions[0].default_route, "disable defaultroute option", OPT_A2COPY, &ipcp_wantoptions[0].default_route }, { "-defaultroute", o_bool, &ipcp_allowoptions[0].default_route, "disable defaultroute option", OPT_A2COPY, &ipcp_wantoptions[0].default_route }, { "proxyarp", o_bool, &ipcp_wantoptions[0].proxy_arp, "Add proxy ARP entry", OPT_ENABLE|1, &ipcp_allowoptions[0].proxy_arp }, { "autoproxyarp", o_special_noarg, (void *)autoproxyarp, "Add proxy ARP entry if needed", OPT_ENABLE, &ipcp_allowoptions[0].proxy_arp }, { "noproxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp, "disable proxyarp option", OPT_A2COPY, &ipcp_wantoptions[0].proxy_arp }, { "-proxyarp", o_bool, &ipcp_allowoptions[0].proxy_arp, "disable proxyarp option", OPT_A2COPY, &ipcp_wantoptions[0].proxy_arp }, { "usepeerdns", o_bool, &ipcp_wantoptions[0].req_dns1, "Ask peer for DNS address(es)", OPT_A2COPY|1, &ipcp_wantoptions[0].req_dns2 }, { NULL } }; /* * Protocol entry points from main code. */ static void ipcp_init __P((int)); static void ipcp_open __P((int)); static void ipcp_close __P((int, char *)); static void ipcp_lowerup __P((int)); static void ipcp_lowerdown __P((int)); static void ipcp_input __P((int, u_char *, int)); static void ipcp_protrej __P((int)); static int ipcp_printpkt __P((u_char *, int, void (*) __P((void *, const char *, ...)), void *)); static void ip_check_options __P((void)); static int ip_demand_conf __P((int)); static int ip_active_pkt __P((u_char *, int)); static void ipcp_print_stat __P((int, FILE *)); static void create_resolv __P((u_int32_t, u_int32_t)); struct protent ipcp_protent = { PPP_IPCP, ipcp_init, ipcp_input, ipcp_protrej, ipcp_lowerup, ipcp_lowerdown, ipcp_open, ipcp_close, ipcp_printpkt, NULL, 1, "IPCP", "IP", ipcp_option_list, ip_check_options, ip_demand_conf, ip_active_pkt, ipcp_print_stat }; static void ipcp_clear_addrs __P((int, u_int32_t, u_int32_t)); static void ipcp_script __P((char *)); /* Run an up/down script */ static void ipcp_script_done __P((void *, int)); /* * Lengths of configuration options. */ #define CILEN_VOID 2 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */ #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */ #define CILEN_ADDR 6 /* new-style single address option */ #define CILEN_ADDRS 10 /* old-style dual address option */ /* * This state variable is used to ensure that we don't * run an ipcp-up/down script while one is already running. */ static enum script_state { s_down, s_up } ipcp_script_state; static pid_t ipcp_script_pid; /* * Make a string representation of a network IP address. */ char * ip_ntoa(ipaddr) u_int32_t ipaddr; { static char b[64]; (void) slprintf(b, sizeof(b), "%I", ipaddr); return b; } /* * Option parsing. */ /* * setvjslots - set maximum number of connection slots for VJ compression */ static int setvjslots(argv) char **argv; { int value; if (!int_option(*argv, &value)) return 0; if (value < 2 || value > 16) { option_error("vj-max-slots value must be between 2 and 16"); return 0; } ipcp_wantoptions [0].maxslotindex = ipcp_allowoptions[0].maxslotindex = value - 1; return 1; } /* * setmsservaddr - Set the primary and secondary server addresses in the * array. setdnsaddr() and setwinsaddr() call this function with either * dnsaddr[] or winsaddr[] as the serverarray argument. */ static int setmsservaddr(servname, serverarray) char *servname; u_int32_t *serverarray; { u_int32_t addr; struct hostent *hp = NULL; addr = inet_addr(servname); if (addr == (u_int32_t) -1) { if ((hp = gethostbyname(servname)) == NULL) return 0; BCOPY(hp->h_addr, &addr, sizeof (u_int32_t)); } /* * If there is no primary then this is the first instance of the * option, we must set the primary. In that case, try to set the * secondary to h_addr_list[1]. If the primary is already set, then * this is the second instance of the option, and we must set * the secondary. */ if (serverarray[0] == 0) { serverarray[0] = addr; if (hp != NULL && hp->h_addr_list[1] != NULL) BCOPY(hp->h_addr_list[1], &serverarray[1], sizeof (u_int32_t)); else serverarray[1] = addr; } else { serverarray[1] = addr; } return (1); } /* * setdnsaddr - set the dns address(es) */ static int setdnsaddr(argv) char **argv; { if (setmsservaddr(*argv, &(ipcp_allowoptions[0].dnsaddr[0])) == 0) { option_error("invalid address parameter '%s' for ms-dns option", *argv); return (0); } return (1); } /* * setwinsaddr - set the wins address(es) * This is primrarly used with the Samba package under UNIX or for pointing * the caller to the existing WINS server on a Windows NT platform. */ static int setwinsaddr(argv) char **argv; { if (setmsservaddr(*argv, &(ipcp_allowoptions[0].winsaddr[0])) == 0) { option_error("invalid address parameter '%s' for ms-wins option", *argv); return (0); } return (1); } /* * autoproxyarp -- enable proxy ARP but don't emit error messages if * it's not actually needed. */ /*ARGSUSED*/ static int autoproxyarp(argv) char **argv; { ipcp_wantoptions[0].proxy_arp = 1; proxy_arp_quiet[0] = 1; return (1); } /* * ipcp_init - Initialize IPCP. */ static void ipcp_init(unit) int unit; { fsm *f = &ipcp_fsm[unit]; ipcp_options *wo = &ipcp_wantoptions[unit]; ipcp_options *ao = &ipcp_allowoptions[unit]; f->unit = unit; f->protocol = PPP_IPCP; f->callbacks = &ipcp_callbacks; fsm_init(&ipcp_fsm[unit]); BZERO(wo, sizeof(*wo)); BZERO(ao, sizeof(*ao)); wo->neg_addr = wo->old_addrs = 1; wo->neg_vj = 1; wo->vj_protocol = IPCP_VJ_COMP; wo->maxslotindex = MAX_STATES - 1; /* really max index */ wo->cflag = 1; ao->neg_addr = ao->old_addrs = 1; ao->neg_vj = 1; ao->maxslotindex = MAX_STATES - 1; ao->cflag = 1; /* * These aren't actually negotiated. Instead, they control * whether the user may use the proxyarp and defaultroute options. */ ao->proxy_arp = 1; ao->default_route = 1; proxy_arp_quiet[unit] = 0; } /* * ipcp_open - IPCP is allowed to come up. */ static void ipcp_open(unit) int unit; { fsm_open(&ipcp_fsm[unit]); } /* * ipcp_close - Take IPCP down. */ static void ipcp_close(unit, reason) int unit; char *reason; { fsm_close(&ipcp_fsm[unit], reason); } /* * ipcp_lowerup - The lower layer is up. */ static void ipcp_lowerup(unit) int unit; { fsm_lowerup(&ipcp_fsm[unit]); } /* * ipcp_lowerdown - The lower layer is down. */ static void ipcp_lowerdown(unit) int unit; { fsm_lowerdown(&ipcp_fsm[unit]); } /* * ipcp_input - Input IPCP packet. */ static void ipcp_input(unit, p, len) int unit; u_char *p; int len; { fsm_input(&ipcp_fsm[unit], p, len); } /* * ipcp_protrej - A Protocol-Reject was received for IPCP. */ static void ipcp_protrej(unit) int unit; { fsm_protreject(&ipcp_fsm[unit]); } /* * ipcp_resetci - Reset our CI. * Called by fsm_sconfreq, Send Configure Request. */ static void ipcp_resetci(f) fsm *f; { ipcp_options *wo = &ipcp_wantoptions[f->unit]; ipcp_options *go = &ipcp_gotoptions[f->unit]; ipcp_options *ao = &ipcp_allowoptions[f->unit]; wo->req_addr = (wo->neg_addr || wo->old_addrs) && (ao->neg_addr || ao->old_addrs); if (wo->ouraddr == 0 || disable_defaultip) wo->accept_local = 1; if (wo->hisaddr == 0) wo->accept_remote = 1; *go = *wo; if (disable_defaultip) go->ouraddr = 0; } /* * ipcp_cilen - Return length of our CI. * Called by fsm_sconfreq, Send Configure Request. */ static int ipcp_cilen(f) fsm *f; { ipcp_options *go = &ipcp_gotoptions[f->unit]; ipcp_options *wo = &ipcp_wantoptions[f->unit]; ipcp_options *ho = &ipcp_hisoptions[f->unit]; #define LENCIADDRS(neg) (neg ? CILEN_ADDRS : 0) #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) #define LENCIADDR(neg) (neg ? (CILEN_ADDR) : 0) /* * First see if we want to change our options to the old * forms because we have received old forms from the peer. */ if (go->neg_addr && go->old_addrs && !ho->neg_addr && ho->old_addrs) /* use the old style of address negotiation */ go->neg_addr = 0; if (wo->neg_vj && !go->neg_vj && !go->old_vj) { /* try an older style of VJ negotiation */ /* use the old style only if the peer did */ if (ho->neg_vj && ho->old_vj) { go->neg_vj = 1; go->old_vj = 1; go->vj_protocol = ho->vj_protocol; } } return (LENCIADDRS(!go->neg_addr && go->old_addrs) + LENCIVJ(go->neg_vj, go->old_vj) + LENCIADDR(go->neg_addr) + LENCIADDR(go->req_dns1) + LENCIADDR(go->req_dns2)) ; } /* * ipcp_addci - Add our desired CIs to a packet. * Called by fsm_sconfreq, Send Configure Request. */ static void ipcp_addci(f, ucp, lenp) fsm *f; u_char *ucp; int *lenp; { ipcp_options *go = &ipcp_gotoptions[f->unit]; int len = *lenp; #define ADDCIADDRS(opt, neg, val1, val2) \ if (neg) { \ if (len >= CILEN_ADDRS) { \ PUTCHAR(opt, ucp); \ PUTCHAR(CILEN_ADDRS, ucp); \ PUTNLONG(val1, ucp); \ PUTNLONG(val2, ucp); \ len -= CILEN_ADDRS; \ } else \ go->old_addrs = 0; \ } #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \ if (neg) { \ int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ if (len >= vjlen) { \ PUTCHAR(opt, ucp); \ PUTCHAR(vjlen, ucp); \ PUTSHORT(val, ucp); \ if (!old) { \ PUTCHAR(maxslotindex, ucp); \ PUTCHAR(cflag, ucp); \ } \ len -= vjlen; \ } else \ neg = 0; \ } #define ADDCIADDR(opt, neg, val) \ if (neg) { \ if (len >= CILEN_ADDR) { \ PUTCHAR(opt, ucp); \ PUTCHAR(CILEN_ADDR, ucp); \ PUTNLONG(val, ucp); \ len -= CILEN_ADDR; \ } else \ neg = 0; \ } ADDCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr, go->hisaddr); ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, go->maxslotindex, go->cflag); ADDCIADDR(CI_ADDR, go->neg_addr, go->ouraddr); ADDCIADDR(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); ADDCIADDR(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); *lenp -= len; } /* * ipcp_ackci - Ack our CIs. * Called by fsm_rconfack, Receive Configure ACK. * * Returns: * 0 - Ack was bad. * 1 - Ack was good. */ static int ipcp_ackci(f, p, len) fsm *f; u_char *p; int len; { ipcp_options *go = &ipcp_gotoptions[f->unit]; u_short cilen, citype, cishort; u_int32_t cilong; u_char cimaxslotindex, cicflag; /* * 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. */ #define ACKCHECK(opt, olen) \ if ((len -= olen) < 0) \ goto bad; \ GETCHAR(citype, p); \ GETCHAR(cilen, p); \ if (cilen != olen || \ citype != opt) \ goto bad; #define ACKCIADDRS(opt, neg, val1, val2) \ if (neg) { \ ACKCHECK(opt, CILEN_ADDRS) \ GETNLONG(cilong, p); \ if (val1 != cilong) \ goto bad; \ GETNLONG(cilong, p); \ if (val2 != cilong) \ goto bad; \ } #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \ if (neg) { \ int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \ ACKCHECK(opt, vjlen) \ GETSHORT(cishort, p); \ if (cishort != val) \ goto bad; \ if (!old) { \ GETCHAR(cimaxslotindex, p); \ if (cimaxslotindex != maxslotindex) \ goto bad; \ GETCHAR(cicflag, p); \ if (cicflag != cflag) \ goto bad; \ } \ } #define ACKCIADDR(opt, neg, val) \ if (neg) { \ ACKCHECK(opt, CILEN_ADDR) \ GETNLONG(cilong, p); \ if (val != cilong) \ goto bad; \ } ACKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr, go->hisaddr); ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj, go->maxslotindex, go->cflag); ACKCIADDR(CI_ADDR, go->neg_addr, go->ouraddr); ACKCIADDR(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]); ACKCIADDR(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]); /* * If there are any remaining CIs, then this packet is bad. */ if (len != 0) goto bad; return (1); bad: IPCPDEBUG(("ipcp_ackci: received bad Ack!")); return (0); } /* * ipcp_nakci - Peer has sent a NAK for some of our CIs. * This should not modify any state if the Nak is bad * or if IPCP is in the OPENED state. * Calback from fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject. * * Returns: * 0 - Nak was bad. * 1 - Nak was good. */ static int ipcp_nakci(f, p, len) fsm *f; u_char *p; int len; { ipcp_options *go = &ipcp_gotoptions[f->unit]; u_char cimaxslotindex, cicflag; u_char citype, cilen, *next; u_short cishort; u_int32_t ciaddr1, ciaddr2; ipcp_options no; /* options we've seen Naks for */ ipcp_options try; /* options to request next time */ BZERO(&no, sizeof(no)); try = *go; /* * Any Nak'd 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. */ #define NAKCIADDRS(opt, neg, code) \ if ((neg) && \ (cilen = p[1]) == CILEN_ADDRS && \ len >= cilen && \ p[0] == opt) { \ len -= cilen; \ INCPTR(2, p); \ GETNLONG(ciaddr1, p); \ GETNLONG(ciaddr2, p); \ no.old_addrs = 1; \ code \ } #define NAKCIVJ(opt, neg, code) \ if (go->neg && \ ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \ len >= cilen && \ p[0] == opt) { \ len -= cilen; \ INCPTR(2, p); \ GETSHORT(cishort, p); \ no.neg = 1; \ code \ } #define NAKCIADDR(opt, neg, code) \ if (go->neg && \ (cilen = p[1]) == CILEN_ADDR && \ len >= cilen && \ p[0] == opt) { \ len -= cilen; \ INCPTR(2, p); \ GETNLONG(ciaddr1, p); \ no.neg = 1; \ code \ } /* * Accept the peer's idea of {our,his} address, if different * from our idea, only if the accept_{local,remote} flag is set. */ NAKCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, if (go->accept_local && ciaddr1) { /* Do we know our address? */ try.ouraddr = ciaddr1; } if (go->accept_remote && ciaddr2) { /* Does he know his? */ try.hisaddr = ciaddr2; } ); /* * Accept the peer's value of maxslotindex provided that it * is less than what we asked for. Turn off slot-ID compression * if the peer wants. Send old-style compress-type option if * the peer wants. */ NAKCIVJ(CI_COMPRESSTYPE, neg_vj, if (cilen == CILEN_VJ) { GETCHAR(cimaxslotindex, p); GETCHAR(cicflag, p); if (cishort == IPCP_VJ_COMP) { try.old_vj = 0; if (cimaxslotindex < go->maxslotindex) try.maxslotindex = cimaxslotindex; if (!cicflag) try.cflag = 0; } else { try.neg_vj = 0; } } else { if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) { try.old_vj = 1; try.vj_protocol = cishort; } else { try.neg_vj = 0; } } ); NAKCIADDR(CI_ADDR, neg_addr, if (go->accept_local && ciaddr1) { /* Do we know our address? */ try.ouraddr = ciaddr1; } ); NAKCIADDR(CI_MS_DNS1, req_dns1, try.dnsaddr[0] = ciaddr1; ); NAKCIADDR(CI_MS_DNS2, req_dns2, try.dnsaddr[1] = ciaddr1; ); /* * There may be remaining CIs, if the peer is requesting negotiation * on an option that we didn't include in our request packet. * If they want to negotiate about IP addresses, we comply. * If they want us to ask for compression, we refuse. */ while (len > CILEN_VOID) { GETCHAR(citype, p); GETCHAR(cilen, p); if( (len -= cilen) < 0 ) goto bad; next = p + cilen - 2; switch (citype) { case CI_COMPRESSTYPE: if (go->neg_vj || no.neg_vj || (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) goto bad; no.neg_vj = 1; break; case CI_ADDRS: if ((!go->neg_addr && go->old_addrs) || no.old_addrs || cilen != CILEN_ADDRS) goto bad; try.neg_addr = 1; try.old_addrs = 1; GETNLONG(ciaddr1, p); if (ciaddr1 && go->accept_local) try.ouraddr = ciaddr1; GETNLONG(ciaddr2, p); if (ciaddr2 && go->accept_remote) try.hisaddr = ciaddr2; no.old_addrs = 1; break; case CI_ADDR: if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) goto bad; try.old_addrs = 0; GETNLONG(ciaddr1, p); if (ciaddr1 && go->accept_local) try.ouraddr = ciaddr1; if (try.ouraddr != 0) try.neg_addr = 1; no.neg_addr = 1; break; } p = next; } /* * OK, the Nak is good. Now we can update state. * If there are any remaining options, we ignore them. */ if (f->state != OPENED) *go = try; return 1; bad: IPCPDEBUG(("ipcp_nakci: received bad Nak!")); return 0; } /* * ipcp_rejci - Reject some of our CIs. * Callback from fsm_rconfnakrej. */ static int ipcp_rejci(f, p, len) fsm *f; u_char *p; int len; { ipcp_options *go = &ipcp_gotoptions[f->unit]; u_char cimaxslotindex, ciflag, cilen; u_short cishort; u_int32_t cilong; ipcp_options try; /* options to request next time */ try = *go; /* * 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. */ #define REJCIADDRS(opt, neg, val1, val2) \ if ((neg) && \ (cilen = p[1]) == CILEN_ADDRS && \ len >= cilen && \ p[0] == opt) { \ len -= cilen; \ INCPTR(2, p); \ GETNLONG(cilong, p); \ /* Check rejected value. */ \ if (cilong != val1) \ goto bad; \ GETNLONG(cilong, p); \ /* Check rejected value. */ \ if (cilong != val2) \ goto bad; \ try.old_addrs = 0; \ } #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \ if (go->neg && \ p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \ len >= p[1] && \ p[0] == opt) { \ len -= p[1]; \ INCPTR(2, p); \ GETSHORT(cishort, p); \ /* Check rejected value. */ \ if (cishort != val) \ goto bad; \ if (!old) { \ GETCHAR(cimaxslotindex, p); \ if (cimaxslotindex != maxslot) \ goto bad; \ GETCHAR(ciflag, p); \ if (ciflag != cflag) \ goto bad; \ } \ try.neg = 0; \ } #define REJCIADDR(opt, neg, addr) \ if (go->neg && \ ((cilen = p[1]) == CILEN_ADDR) && \ len >= cilen && \ p[0] == opt) { \ len -= cilen; \ INCPTR(2, p); \ GETNLONG(cilong, p); \ /* Check rejected value. */ \ if (cilong != addr) \ goto bad; \ try.neg = 0; \ } REJCIADDRS(CI_ADDRS, !go->neg_addr && go->old_addrs, go->ouraddr, go->hisaddr); REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj, go->maxslotindex, go->cflag); REJCIADDR(CI_ADDR, neg_addr, go->ouraddr); REJCIADDR(CI_MS_DNS1, req_dns1, go->dnsaddr[0]); REJCIADDR(CI_MS_DNS2, req_dns2, go->dnsaddr[1]); /* * If there are any remaining CIs, then this packet is bad. */ if (len != 0) goto bad; /* * Now we can update state. */ if (f->state != OPENED) *go = try; return 1; bad: IPCPDEBUG(("ipcp_rejci: received bad Reject!")); return 0; } /* * ipcp_reqci - Check the peer's requested CIs and send appropriate response. * Callback from fsm_rconfreq, Receive Configure Request * * Returns: CODE_CONFACK, CODE_CONFNAK or CODE_CONFREJ and input * packet modified appropriately. If reject_if_disagree is non-zero, * doesn't return CODE_CONFNAK; returns CODE_CONFREJ if it can't * return CODE_CONFACK. */ static int ipcp_reqci(f, p, lenp, dont_nak) fsm *f; u_char *p; /* Requested CIs */ int *lenp; /* Length of requested CIs */ bool dont_nak; { ipcp_options *wo = &ipcp_wantoptions[f->unit]; ipcp_options *ho = &ipcp_hisoptions[f->unit]; ipcp_options *ao = &ipcp_allowoptions[f->unit]; ipcp_options *go = &ipcp_gotoptions[f->unit]; int ret, newret; u_char *p0, *nakp, *rejp, *prev; u_short cishort; int len, cilen, type; u_int32_t tl, ciaddr1, ciaddr2; /* Parsed address values */ u_char maxslotindex, cflag; int d; ret = CODE_CONFACK; rejp = p0 = p; nakp = nak_buffer; /* * Reset all his options. */ BZERO(ho, sizeof(*ho)); /* * Process all his options. */ for (len = *lenp; len > 0; len -= cilen, p = prev + cilen) { if ((len < 2) || p[1] > len) { /* * RFC 1661 page 40 -- if the option extends beyond the * packet, then discard the entire packet. */ return (0); } newret = CODE_CONFACK; prev = p; GETCHAR(type, p); GETCHAR(cilen, p); switch (type) { /* Check CI type */ case CI_ADDRS: if (!ao->old_addrs || ho->neg_addr) { newret = CODE_CONFREJ; break; } if (cilen != CILEN_ADDRS) { /* * rfc1661, page 40 -- a recongnized option with an * invalid length should be Nak'ed. */ newret = CODE_CONFNAK; ciaddr1 = wo->hisaddr; ciaddr2 = wo->ouraddr; } else { /* * If he has no address, or if we both have his * address but disagree about it, then NAK it with our * idea. In particular, if we don't know his address, * but he does, then accept it. */ GETNLONG(ciaddr1, p); if (ciaddr1 != wo->hisaddr && (ciaddr1 == 0 || !wo->accept_remote)) { newret = CODE_CONFNAK; ciaddr1 = wo->hisaddr; } else if (ciaddr1 == 0 && wo->hisaddr == 0) { /* * If neither we nor he knows his address, reject * the option. */ newret = CODE_CONFREJ; wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ break; } else if (ciaddr1 != 0) { go->hisaddr = ciaddr1; } /* * If he doesn't know our address, or if we both have * our address * but disagree about it, then NAK it * with our idea. */ GETNLONG(ciaddr2, p); if (ciaddr2 != wo->ouraddr) { if (ciaddr2 == 0 || !wo->accept_local) { newret = CODE_CONFNAK; ciaddr2 = wo->ouraddr; } else { go->ouraddr = ciaddr2; /* accept peer's idea */ } } } if (newret == CODE_CONFNAK) { PUTCHAR(type, nakp); PUTCHAR(CILEN_ADDRS, nakp); PUTNLONG(ciaddr1, nakp); PUTNLONG(ciaddr2, nakp); } ho->old_addrs = 1; ho->hisaddr = ciaddr1; ho->ouraddr = ciaddr2; break; case CI_ADDR: if (!ao->neg_addr || ho->old_addrs) { newret = CODE_CONFREJ; break; } if (cilen != CILEN_ADDR) { /* * rfc1661, page 40 -- a recongnized option with an * invalid length should be Nak'ed. */ newret = CODE_CONFNAK; ciaddr1 = wo->hisaddr; } else { /* * If he has no address, or if we both have his * address but disagree about it, then NAK it with our * idea. In particular, if we don't know his address, * but he does, then accept it. */ GETNLONG(ciaddr1, p); if (ciaddr1 != wo->hisaddr && (ciaddr1 == 0 || !wo->accept_remote)) { newret = CODE_CONFNAK; ciaddr1 = wo->hisaddr; } else if (ciaddr1 == 0 && wo->hisaddr == 0 && wo->default_route != 0) { newret = CODE_CONFNAK; /* * If this is a dialup line (default_route is * set), and neither side knows about his address, * suggest an arbitrary rfc1918 address. */ ciaddr1 = htonl(0xc0a80101 + ifunit); dbglog("Peer address unknown; suggesting %I", ciaddr1); } else if (ciaddr1 == 0 && wo->hisaddr == 0) { /* * If this is not a dialup line, don't ACK an * address of 0.0.0.0 - reject it instead. */ newret = CODE_CONFREJ; wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ break; } } if (newret == CODE_CONFNAK) { PUTCHAR(type, nakp); PUTCHAR(CILEN_ADDR, nakp); PUTNLONG(ciaddr1, nakp); } ho->neg_addr = 1; ho->hisaddr = ciaddr1; break; case CI_MS_DNS1: case CI_MS_DNS2: /* Warning -- these options work backwards. */ /* Microsoft primary or secondary DNS request */ d = (type == CI_MS_DNS2 ? 1 : 0); if (ao->dnsaddr[d] == 0) { newret = CODE_CONFREJ; break; } if (cilen != CILEN_ADDR) { newret = CODE_CONFNAK; } else { GETNLONG(tl, p); if (tl != ao->dnsaddr[d]) { newret = CODE_CONFNAK; } } if (newret == CODE_CONFNAK) { PUTCHAR(type, nakp); PUTCHAR(CILEN_ADDR, nakp); PUTNLONG(ao->dnsaddr[d], nakp); } break; case CI_MS_WINS1: case CI_MS_WINS2: /* Warning -- these options work backwards. */ /* Microsoft primary or secondary WINS request */ d = (type == CI_MS_WINS2 ? 1 : 0); if (ao->winsaddr[d] == 0) { newret = CODE_CONFREJ; break; } if (cilen != CILEN_ADDR) { newret = CODE_CONFNAK; } else { GETNLONG(tl, p); if (tl != ao->winsaddr[d]) { newret = CODE_CONFNAK; } } if (newret == CODE_CONFNAK) { PUTCHAR(type, nakp); PUTCHAR(CILEN_ADDR, nakp); PUTNLONG(ao->winsaddr[d], nakp); } break; case CI_COMPRESSTYPE: if (!ao->neg_vj) { newret = CODE_CONFREJ; break; } maxslotindex = ao->maxslotindex; cflag = ao->cflag; if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) { newret = CODE_CONFNAK; cishort = IPCP_VJ_COMP; } else { GETSHORT(cishort, p); if (cishort != IPCP_VJ_COMP && (cishort != IPCP_VJ_COMP_OLD || cilen != CILEN_COMPRESS)) { newret = CODE_CONFNAK; cishort = IPCP_VJ_COMP; } else if (cilen == CILEN_VJ) { GETCHAR(maxslotindex, p); if (maxslotindex > ao->maxslotindex) { newret = CODE_CONFNAK; maxslotindex = ao->maxslotindex; } GETCHAR(cflag, p); if (cflag != 0 && ao->cflag == 0) { newret = CODE_CONFNAK; cflag = 0; } } else { ho->old_vj = 1; maxslotindex = MAX_STATES - 1; cflag = 1; } } if (newret == CODE_CONFNAK) { PUTCHAR(type, nakp); if (cishort == IPCP_VJ_COMP) { PUTCHAR(CILEN_VJ, nakp); PUTSHORT(cishort, nakp); PUTCHAR(maxslotindex, nakp); PUTCHAR(cflag, nakp); } else { PUTCHAR(CILEN_COMPRESS, nakp); PUTSHORT(cishort, nakp); } } ho->neg_vj = 1; ho->vj_protocol = cishort; ho->maxslotindex = maxslotindex; ho->cflag = cflag; break; default: newret = CODE_CONFREJ; break; } /* Cope with confused peers. */ if (cilen < 2) cilen = 2; /* * If this is an Ack'able CI, but we're sending back a Nak, * don't include this CI. */ if (newret == CODE_CONFACK && ret != CODE_CONFACK) continue; if (newret == CODE_CONFNAK) { if (dont_nak) { newret = CODE_CONFREJ; } else { /* Ignore subsequent Nak'able things if rejecting. */ if (ret == CODE_CONFREJ) continue; ret = CODE_CONFNAK; } } if (newret == CODE_CONFREJ) { ret = CODE_CONFREJ; if (prev != rejp) BCOPY(prev, rejp, cilen); rejp += cilen; } } /* * 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 CI_ADDR option appended. We assume the * input buffer is long enough that we can append the extra * option safely. */ if (ret != CODE_CONFREJ && !ho->neg_addr && !ho->old_addrs && wo->req_addr && !dont_nak) { if (ret == CODE_CONFACK) wo->req_addr = 0; /* don't ask again */ ret = CODE_CONFNAK; PUTCHAR(CI_ADDR, nakp); PUTCHAR(CILEN_ADDR, nakp); PUTNLONG(wo->hisaddr, nakp); } switch (ret) { case CODE_CONFACK: *lenp = p - p0; sys_block_proto(PPP_IP); break; case CODE_CONFNAK: *lenp = nakp - nak_buffer; BCOPY(nak_buffer, p0, *lenp); break; case CODE_CONFREJ: *lenp = rejp - p0; break; } return (ret); /* Return final code */ } /* * ip_check_options - check that any IP-related options are OK, * and assign appropriate defaults. */ static void ip_check_options() { struct hostent *hp; u_int32_t local; ipcp_options *wo = &ipcp_wantoptions[0]; /* * Default our local IP address based on our hostname. * If local IP address already given, don't bother. */ if (wo->ouraddr == 0) { /* * Look up our hostname (possibly with domain name appended) * and take the first IP address as our local IP address. * If there isn't an IP address for our hostname, too bad. */ wo->accept_local = 1; /* don't insist on this default value */ if ((hp = gethostbyname(hostname)) != NULL) { BCOPY(hp->h_addr, &local, sizeof (hp->h_addr)); if (local != 0 && !bad_ip_adrs(local)) { wo->ouraddr = local; ipcp_from_hostname = 1; } } } } /* * ip_demand_conf - configure the interface as though * IPCP were up, for use with dial-on-demand. */ static int ip_demand_conf(u) int u; { ipcp_options *wo = &ipcp_wantoptions[u]; if (wo->hisaddr == 0) { /* make up an arbitrary address for the peer */ wo->hisaddr = htonl(0x0a707070 + ifunit); wo->accept_remote = 1; } if (wo->ouraddr == 0) { /* make up an arbitrary address for us */ wo->ouraddr = htonl(0x0a404040 + ifunit); wo->accept_local = 1; disable_defaultip = 1; /* don't tell the peer this address */ } if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr))) return 0; if (!sifup(u)) return 0; if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) return 0; if (wo->default_route && sifdefaultroute(u, wo->ouraddr, wo->hisaddr)) default_route_set[u] = 1; if (wo->proxy_arp && sifproxyarp(u, wo->hisaddr, proxy_arp_quiet[u])) proxy_arp_set[u] = 1; notice("local IP address %I", wo->ouraddr); notice("remote IP address %I", wo->hisaddr); return 1; } /* * ipcp_up - IPCP has come UP. * * Configure the IP network interface appropriately and bring it up. */ static void ipcp_up(f) fsm *f; { u_int32_t mask; ipcp_options *ho = &ipcp_hisoptions[f->unit]; ipcp_options *go = &ipcp_gotoptions[f->unit]; ipcp_options *wo = &ipcp_wantoptions[f->unit]; IPCPDEBUG(("ipcp: up")); /* * We must have a non-zero IP address for both ends of the link. */ if (ho->hisaddr == 0) ho->hisaddr = wo->hisaddr; if (ho->hisaddr == 0) { if (wo->accept_remote) { /* Pick some rfc1918 address. */ ho->hisaddr = htonl(0xc0a80101 + ifunit); dbglog("Peer refused to provide his address; assuming %I", ho->hisaddr); } else { error("Could not determine remote IP address"); ipcp_close(f->unit, "Could not determine remote IP address"); return; } } if (go->ouraddr == 0) { error("Could not determine local IP address"); ipcp_close(f->unit, "Could not determine local IP address"); return; } script_setenv("IPLOCAL", ip_ntoa(go->ouraddr), 0); script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr), 1); /* * Check that the peer is allowed to use the IP address it wants. */ if (!auth_ip_addr(f->unit, ho->hisaddr)) { error("Peer is not authorized to use remote address %I", ho->hisaddr); ipcp_close(f->unit, "Unauthorized remote IP address"); return; } if ((go->req_dns1 && go->dnsaddr[0] != 0) || (go->req_dns2 && go->dnsaddr[1] != 0)) { script_setenv("USEPEERDNS", "1", 0); if (go->dnsaddr[0] != 0) script_setenv("DNS1", ip_ntoa(go->dnsaddr[0]), 0); if (go->dnsaddr[1] != 0) script_setenv("DNS2", ip_ntoa(go->dnsaddr[1]), 0); create_resolv(go->dnsaddr[0], go->dnsaddr[1]); } /* set tcp compression */ if (sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex) != 1) { ipcp_close(f->unit, "Could not enable VJ TCP header compression"); return; } /* * If we are doing dial-on-demand, the interface is already * configured, so we put out any saved-up packets, then set the * interface to pass IP packets. */ if (demand) { if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) { ipcp_clear_addrs(f->unit, wo->ouraddr, wo->hisaddr); if (go->ouraddr != wo->ouraddr) { warn("Local IP address changed to %I", go->ouraddr); script_setenv("OLDIPLOCAL", ip_ntoa(wo->ouraddr), 0); wo->ouraddr = go->ouraddr; } else script_unsetenv("OLDIPLOCAL"); if (ho->hisaddr != wo->hisaddr) { warn("Remote IP address changed to %I", ho->hisaddr); script_setenv("OLDIPREMOTE", ip_ntoa(wo->hisaddr), 0); wo->hisaddr = ho->hisaddr; } else script_unsetenv("OLDIPREMOTE"); /* Set the interface to the new addresses */ mask = GetMask(go->ouraddr); if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { warn("Interface configuration failed"); ipcp_close(f->unit, "Interface configuration failed"); return; } /* assign a default route through the interface if required */ if (wo->default_route) if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) default_route_set[f->unit] = 1; /* Make a proxy ARP entry if requested. */ if (wo->proxy_arp && sifproxyarp(f->unit, ho->hisaddr, proxy_arp_quiet[f->unit])) proxy_arp_set[f->unit] = 1; } demand_rexmit(PPP_IP); if (sifnpmode(f->unit, PPP_IP, NPMODE_PASS) != 1) { ipcp_close(f->unit, "Interface configuration failed."); return; } } else { /* * Set IP addresses and (if specified) netmask. */ mask = GetMask(go->ouraddr); #if SIFUPFIRST /* bring the interface up for IP */ if (!sifup(f->unit)) { warn("Interface failed to come up"); ipcp_close(f->unit, "Interface configuration failed"); return; } #endif if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { warn("Interface configuration failed"); ipcp_close(f->unit, "Interface configuration failed"); return; } #if !SIFUPFIRST /* bring the interface up for IP */ if (!sifup(f->unit)) { warn("Interface failed to come up"); ipcp_close(f->unit, "Interface configuration failed"); return; } #endif if (sifnpmode(f->unit, PPP_IP, NPMODE_PASS) != 1) { ipcp_close(f->unit, "Interface configuration failed."); return; } /* assign a default route through the interface if required */ if (wo->default_route) if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) default_route_set[f->unit] = 1; /* Make a proxy ARP entry if requested. */ if (wo->proxy_arp && sifproxyarp(f->unit, ho->hisaddr, proxy_arp_quiet[f->unit])) proxy_arp_set[f->unit] = 1; wo->ouraddr = go->ouraddr; notice("local IP address %I", go->ouraddr); notice("remote IP address %I", ho->hisaddr); if (go->dnsaddr[0] != 0) notice("primary DNS address %I", go->dnsaddr[0]); if (go->dnsaddr[1] != 0) notice("secondary DNS address %I", go->dnsaddr[1]); } np_up(f->unit, PPP_IP); ipcp_is_up[f->unit] = 1; if (ip_up_hook != NULL) (*ip_up_hook)(); /* * Execute the ip-up script, like this: * /etc/ppp/ip-up interface tty speed local-IP remote-IP */ if (ipcp_script_state == s_down && ipcp_script_pid == 0) { ipcp_script_state = s_up; ipcp_script(_PATH_IPUP); } sys_unblock_proto(PPP_IP); } /* * ipcp_down - IPCP has gone DOWN. * * Take the IP network interface down, clear its addresses * and delete routes through it. */ static void ipcp_down(f) fsm *f; { IPCPDEBUG(("ipcp: down")); /* XXX a bit IPv4-centric here, we only need to get the stats * before the interface is marked down. */ update_link_stats(f->unit); if (ip_down_hook != NULL) (*ip_down_hook)(); if (ipcp_is_up[f->unit]) { ipcp_is_up[f->unit] = 0; np_down(f->unit, PPP_IP); } if (sifvjcomp(f->unit, 0, 0, 0) != 1) { if (debug) warn("Failed to disable VJ TCP header compression."); } /* * If we are doing dial-on-demand, set the interface * to queue up outgoing packets (for now). */ if (demand) { if (sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE) != 1) { if (debug) warn("Failed to enable Queueing on outgoing packets."); } } else { if (sifnpmode(f->unit, PPP_IP, NPMODE_ERROR) != 1) { if (debug) warn("Could not set interface to drop packets."); } if (sifdown(f->unit) != 1) warn("Could not bring interface down."); ipcp_clear_addrs(f->unit, ipcp_gotoptions[f->unit].ouraddr, ipcp_hisoptions[f->unit].hisaddr); } /* Execute the ip-down script */ if (ipcp_script_state == s_up && ipcp_script_pid == 0) { ipcp_script_state = s_down; ipcp_script(_PATH_IPDOWN); } } /* * ipcp_clear_addrs() - clear the interface addresses, routes, * proxy arp entries, etc. */ static void ipcp_clear_addrs(unit, ouraddr, hisaddr) int unit; u_int32_t ouraddr; /* local address */ u_int32_t hisaddr; /* remote address */ { if (proxy_arp_set[unit]) { (void) cifproxyarp(unit, hisaddr); proxy_arp_set[unit] = 0; } if (default_route_set[unit]) { (void) cifdefaultroute(unit, ouraddr, hisaddr); default_route_set[unit] = 0; } if (cifaddr(unit, ouraddr, hisaddr) != 1) warn("Could not clear addresses"); } /* * ipcp_finished - possibly shut down the lower layers. */ static void ipcp_finished(f) fsm *f; { np_finished(f->unit, PPP_IP); } /* * ipcp_script_done - called when the ip-up or ip-down script * has finished. */ /*ARGSUSED*/ static void ipcp_script_done(arg, status) void *arg; int status; { ipcp_script_pid = 0; switch (ipcp_script_state) { case s_up: if (ipcp_fsm[0].state != OPENED) { ipcp_script_state = s_down; ipcp_script(_PATH_IPDOWN); } break; case s_down: if (ipcp_fsm[0].state == OPENED) { ipcp_script_state = s_up; ipcp_script(_PATH_IPUP); } break; } } /* * ipcp_script - Execute a script with arguments * interface-name tty-name speed local-IP remote-IP. */ static void ipcp_script(script) char *script; { char strspeed[32], strlocal[32], strremote[32]; char *argv[8]; (void) slprintf(strspeed, sizeof(strspeed), "%d", baud_rate); (void) slprintf(strlocal, sizeof(strlocal), "%I", ipcp_gotoptions[0].ouraddr); (void) slprintf(strremote, sizeof(strremote), "%I", ipcp_hisoptions[0].hisaddr); argv[0] = script; argv[1] = ifname; argv[2] = devnam; argv[3] = strspeed; argv[4] = strlocal; argv[5] = strremote; argv[6] = ipparam; argv[7] = NULL; ipcp_script_pid = run_program(script, argv, 0, ipcp_script_done, NULL); } /* * create_resolv - create the replacement resolv.conf file */ static void create_resolv(peerdns1, peerdns2) u_int32_t peerdns1, peerdns2; { FILE *f; f = fopen(_PATH_RESOLV, "w"); if (f == NULL) { error("Failed to create %s: %m", _PATH_RESOLV); return; } if (peerdns1) if (fprintf(f, "nameserver %s\n", ip_ntoa(peerdns1)) <= 0) error("Write failed to %s: %m", _PATH_RESOLV); if (peerdns2) if (fprintf(f, "nameserver %s\n", ip_ntoa(peerdns2)) <= 0) error("Write failed to %s: %m", _PATH_RESOLV); if (fclose(f) != 0) error("Failed to close %s: %m", _PATH_RESOLV); } /* * ipcp_printpkt - print the contents of an IPCP packet. */ static int ipcp_printpkt(p, plen, printer, arg) u_char *p; int plen; void (*printer) __P((void *, const 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; printer(arg, " %s id=0x%x", code_name(code, 1), id); len -= HEADERLEN; switch (code) { case CODE_CONFREQ: case CODE_CONFACK: case CODE_CONFNAK: case CODE_CONFREJ: /* print option list */ while (len >= 2) { GETCHAR(code, p); GETCHAR(olen, p); p -= 2; if (olen < 2 || olen > len) { break; } printer(arg, " <"); len -= olen; optend = p + olen; switch (code) { case CI_ADDRS: if (olen == CILEN_ADDRS) { p += 2; GETNLONG(cilong, p); printer(arg, "addrs %I", cilong); GETNLONG(cilong, p); printer(arg, " %I", cilong); } break; case CI_COMPRESSTYPE: if (olen >= CILEN_COMPRESS) { p += 2; GETSHORT(cishort, p); printer(arg, "compress "); switch (cishort) { case IPCP_VJ_COMP: printer(arg, "VJ"); break; case IPCP_VJ_COMP_OLD: printer(arg, "old-VJ"); break; default: printer(arg, "0x%x", cishort); } } break; case CI_ADDR: if (olen == CILEN_ADDR) { p += 2; GETNLONG(cilong, p); printer(arg, "addr %I", cilong); } break; case CI_MS_DNS1: case CI_MS_DNS2: p += 2; GETNLONG(cilong, p); printer(arg, "ms-dns%d %I", (code == CI_MS_DNS1 ? 1 : 2), cilong); break; case CI_MS_WINS1: case CI_MS_WINS2: p += 2; GETNLONG(cilong, p); printer(arg, "ms-wins%d %I", (code == CI_MS_WINS1 ? 1 : 2), cilong); break; case CI_SUBNET: p += 2; GETNLONG(cilong, p); printer(arg, "subnet %I", cilong); break; } while (p < optend) { GETCHAR(code, p); printer(arg, " %.2x", code); } printer(arg, ">"); } break; case CODE_TERMACK: case CODE_TERMREQ: if (len > 0 && *p >= ' ' && *p < 0x7f) { printer(arg, " "); print_string((char *)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", code); } return p - pstart; } char * tcp_flag_decode(val) int val; { static char buf[32]; char *cp = buf; if (val & TH_URG) *cp++ = 'U'; if (val & TH_ACK) *cp++ = 'A'; if (val & TH_PUSH) *cp++ = 'P'; if (val & TH_RST) *cp++ = 'R'; if (val & TH_SYN) *cp++ = 'S'; if (val & TH_FIN) *cp++ = 'F'; if (cp != buf) *cp++ = ' '; *cp = '\0'; return buf; } /* * ip_active_pkt - see if this IP packet is worth bringing the link up for. * We don't bring the link up for IP fragments or for TCP FIN packets * with no data. */ static int ip_active_pkt(pkt, len) u_char *pkt; int len; { u_char *tcp; struct protoent *pep; int val; int hlen; char buf[32], *cp; u_int32_t src, dst; len -= PPP_HDRLEN; pkt += PPP_HDRLEN; if (len < IP_HDRLEN) { dbglog("IP packet of length %d is not activity", len); return 0; } src = get_ipsrc(pkt); dst = get_ipdst(pkt); if ((get_ipoff(pkt) & IP_OFFMASK) != 0) { dbglog("IP fragment from %I->%I is not activity", src, dst); return 0; } val = get_ipproto(pkt); if (val != IPPROTO_TCP) { if (debug) { if ((pep = getprotobynumber(val)) != NULL) { cp = pep->p_name; } else { (void) slprintf(buf, sizeof (buf), "IP proto %d", val); cp = buf; } info("%s from %I->%I is activity", cp, src, dst); } return 1; } hlen = get_iphl(pkt) * 4; if (len < hlen + TCP_HDRLEN) { dbglog("Bad TCP length %d<%d+%d %I->%I is not activity", len, hlen, TCP_HDRLEN, src, dst); return 0; } tcp = pkt + hlen; val = get_tcpflags(tcp); hlen += get_tcpoff(tcp) * 4; if ((val & TH_FIN) != 0 && len == hlen) { dbglog("Empty TCP FIN %I->%I is not activity", src, dst); return 0; } info("TCP %d data %s%I->%I is activity", len - hlen, tcp_flag_decode(get_tcpflags(tcp)), src, dst); return 1; } static void ipcp_print_stat(unit, strptr) int unit; FILE *strptr; { ipcp_options *go = &ipcp_gotoptions[unit]; ipcp_options *ho = &ipcp_hisoptions[unit]; char *proto_name = ipcp_protent.name; if (!ipcp_protent.enabled_flag) { (void) flprintf(strptr, "%s disabled\n", proto_name); return; } (void) flprintf(strptr, "%s state: %s", proto_name, fsm_state(ipcp_fsm[unit].state)); (void) flprintf(strptr, "%s local %I remote %I", proto_name, go->ouraddr, ho->ouraddr); }