/* $OpenBSD: options.c,v 1.4 1996/07/20 12:02:13 joshd Exp $ */ /* * options.c - handles option processing for PPP. * * 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. */ #ifndef lint static char rcsid[] = "$OpenBSD: options.c,v 1.4 1996/07/20 12:02:13 joshd Exp $"; #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pppd.h" #include "pathnames.h" #include "patchlevel.h" #include "fsm.h" #include "lcp.h" #include "ipcp.h" #include "upap.h" #include "chap.h" #include "ccp.h" #include "bpf_compile.h" #ifdef IPX_CHANGE #include "ipxcp.h" #endif /* IPX_CHANGE */ #include #define FALSE 0 #define TRUE 1 #if defined(ultrix) || defined(NeXT) char *strdup __P((char *)); #endif #ifndef GIDSET_TYPE #define GIDSET_TYPE gid_t #endif /* * Option variables and default values. */ int debug = 0; /* Debug flag */ int kdebugflag = 0; /* Tell kernel to print debug messages */ int default_device = 1; /* Using /dev/tty or equivalent */ char devnam[MAXPATHLEN] = "/dev/tty"; /* Device name */ int crtscts = 0; /* Use hardware flow control */ int modem = 1; /* Use modem control lines */ int inspeed = 0; /* Input/Output speed requested */ u_int32_t netmask = 0; /* IP netmask to set on interface */ int lockflag = 0; /* Create lock file to lock the serial dev */ int nodetach = 0; /* Don't detach from controlling tty */ char *connector = NULL; /* Script to establish physical link */ char *disconnector = NULL; /* Script to disestablish physical link */ char *welcomer = NULL; /* Script to run after phys link estab. */ int maxconnect = 0; /* Maximum connect time */ char user[MAXNAMELEN]; /* Username for PAP */ char passwd[MAXSECRETLEN]; /* Password for PAP */ int auth_required = 0; /* Peer is required to authenticate */ int defaultroute = 0; /* assign default route through interface */ int proxyarp = 0; /* Set up proxy ARP entry for peer */ int persist = 0; /* Reopen link after it goes down */ int uselogin = 0; /* Use /etc/passwd for checking PAP */ int lcp_echo_interval = 0; /* Interval between LCP echo-requests */ int lcp_echo_fails = 0; /* Tolerance to unanswered echo-requests */ char our_name[MAXNAMELEN]; /* Our name for authentication purposes */ char remote_name[MAXNAMELEN]; /* Peer's name for authentication */ int usehostname = 0; /* Use hostname for our_name */ int disable_defaultip = 0; /* Don't use hostname for default IP adrs */ int demand = 0; /* do dial-on-demand */ char *ipparam = NULL; /* Extra parameter for ip up/down scripts */ int cryptpap; /* Passwords in pap-secrets are encrypted */ int idle_time_limit = 0; /* Disconnect if idle for this many seconds */ int holdoff = 30; /* # seconds to pause before reconnecting */ struct bpf_program pass_filter;/* Filter program for packets to pass */ struct bpf_program active_filter; /* Filter program for link-active pkts */ int refuse_pap = 0; /* Set to say we won't do PAP */ int refuse_chap = 0; /* Set to say we won't do CHAP */ /* * Prototypes */ static int setdevname __P((char *, int)); static int setipaddr __P((char *)); static int setdebug __P((void)); static int setkdebug __P((char **)); static int setpassive __P((void)); static int setsilent __P((void)); static int noopt __P((void)); static int setnovj __P((void)); static int setnovjccomp __P((void)); static int setvjslots __P((char **)); static int reqpap __P((void)); static int nopap __P((void)); #ifdef OLD_OPTIONS static int setupapfile __P((char **)); #endif static int nochap __P((void)); static int reqchap __P((void)); static int setspeed __P((char *)); static int noaccomp __P((void)); static int noasyncmap __P((void)); static int noip __P((void)); static int nomagicnumber __P((void)); static int setasyncmap __P((char **)); static int setescape __P((char **)); static int setmru __P((char **)); static int setmtu __P((char **)); static int nomru __P((void)); static int nopcomp __P((void)); static int setconnector __P((char **)); static int setdisconnector __P((char **)); static int setwelcomer __P((char **)); static int setmaxconnect __P((char **)); static int setdomain __P((char **)); static int setnetmask __P((char **)); static int setcrtscts __P((void)); static int setnocrtscts __P((void)); static int setxonxoff __P((void)); static int setnodetach __P((void)); static int setmodem __P((void)); static int setlocal __P((void)); static int setlock __P((void)); static int setname __P((char **)); static int setuser __P((char **)); static int setremote __P((char **)); static int setauth __P((void)); static int readfile __P((char **)); static int setdefaultroute __P((void)); static int setnodefaultroute __P((void)); static int setproxyarp __P((void)); static int setnoproxyarp __P((void)); static int setpersist __P((void)); static int setdologin __P((void)); static int setusehostname __P((void)); static int setnoipdflt __P((void)); static int setlcptimeout __P((char **)); static int setlcpterm __P((char **)); static int setlcpconf __P((char **)); static int setlcpfails __P((char **)); static int setipcptimeout __P((char **)); static int setipcpterm __P((char **)); static int setipcpconf __P((char **)); static int setipcpfails __P((char **)); static int setpaptimeout __P((char **)); static int setpapreqs __P((char **)); static int setpapreqtime __P((char **)); static int setchaptimeout __P((char **)); static int setchapchal __P((char **)); static int setchapintv __P((char **)); static int setipcpaccl __P((void)); static int setipcpaccr __P((void)); static int setlcpechointv __P((char **)); static int setlcpechofails __P((char **)); static int noccp __P((void)); static int setbsdcomp __P((char **)); static int setnobsdcomp __P((void)); static int setdeflate __P((char **)); static int setnodeflate __P((void)); static int setdemand __P((void)); static int setpred1comp __P((void)); static int setnopred1comp __P((void)); static int setipparam __P((char **)); static int setpapcrypt __P((void)); static int setidle __P((char **)); static int setholdoff __P((char **)); static int setpassfilter __P((char **)); static int setactivefilter __P((char **)); #ifdef IPX_CHANGE static int setipxproto __P((void)); static int resetipxproto __P((void)); static int setipxanet __P((void)); static int setipxalcl __P((void)); static int setipxarmt __P((void)); static int setipxnetwork __P((char **)); static int setipxnode __P((char **)); static int setipxrouter __P((char **)); static int setipxname __P((char **)); static int setipxcptimeout __P((char **)); static int setipxcpterm __P((char **)); static int setipxcpconf __P((char **)); static int setipxcpfails __P((char **)); #endif /* IPX_CHANGE */ #ifdef USE_MS_DNS static int setdnsaddr __P((char **)); #endif static int number_option __P((char *, u_int32_t *, int)); static int int_option __P((char *, int *)); static int readable __P((int fd)); static void option_error __P((char *fmt, ...)); void usage(); /* * Valid arguments. */ static struct cmd { char *cmd_name; int num_args; int (*cmd_func)(); } cmds[] = { {"-all", 0, noopt}, /* Don't request/allow any options (useless) */ {"noaccomp", 0, noaccomp}, /* Disable Address/Control compression */ {"-ac", 0, noaccomp}, /* Disable Address/Control compress */ {"default-asyncmap", 0, noasyncmap}, /* Disable asyncmap negoatiation */ {"-am", 0, noasyncmap}, /* Disable asyncmap negotiation */ {"-as", 1, setasyncmap}, /* set the desired async map */ {"-d", 0, setdebug}, /* Increase debugging level */ {"nodetach", 0, setnodetach}, /* Don't detach from controlling tty */ {"-detach", 0, setnodetach}, /* don't fork */ {"noip", 0, noip}, /* Disable IP and IPCP */ {"-ip", 0, noip}, /* Disable IP and IPCP */ {"nomagic", 0, nomagicnumber}, /* Disable magic number negotiation */ {"-mn", 0, nomagicnumber}, /* Disable magic number negotiation */ {"default-mru", 0, nomru}, /* Disable MRU negotiation */ {"-mru", 0, nomru}, /* Disable mru negotiation */ {"-p", 0, setpassive}, /* Set passive mode */ {"nopcomp", 0, nopcomp}, /* Disable protocol field compression */ #ifdef OLD_OPTIONS {"-pc", 0, nopcomp}, /* Disable protocol field compress */ #endif {"require-pap", 0, reqpap}, /* Require PAP authentication from peer */ #ifdef OLD_OPTIONS {"+ua", 1, setupapfile}, /* Get PAP user and password from file */ #endif {"+pap", 0, reqpap}, /* Require PAP auth from peer */ {"refuse-pap", 0, nopap}, /* Don't agree to auth to peer with PAP */ {"-pap", 0, nopap}, /* Don't allow UPAP authentication with peer */ {"require-chap", 0, reqchap}, /* Require CHAP authentication from peer */ {"+chap", 0, reqchap}, /* Require CHAP authentication from peer */ {"refuse-chap", 0, nochap}, /* Don't agree to auth to peer with CHAP */ {"-chap", 0, nochap}, /* Don't allow CHAP authentication with peer */ {"novj", 0, setnovj}, /* Disable VJ compression */ {"-vj", 0, setnovj}, /* disable VJ compression */ {"novjccomp", 0, setnovjccomp}, /* disable VJ connection-ID compression */ {"-vjccomp", 0, setnovjccomp}, /* disable VJ connection-ID compression */ {"vj-max-slots", 1, setvjslots}, /* Set maximum VJ header slots */ {"asyncmap", 1, setasyncmap}, /* set the desired async map */ {"escape", 1, setescape}, /* set chars to escape on transmission */ {"connect", 1, setconnector}, /* A program to set up a connection */ {"disconnect", 1, setdisconnector}, /* program to disconnect serial dev. */ {"welcome", 1, setwelcomer},/* Script to welcome client */ {"maxconnect", 1, setmaxconnect}, /* specify a maximum connect time */ {"crtscts", 0, setcrtscts}, /* set h/w flow control */ {"nocrtscts", 0, setnocrtscts}, /* clear h/w flow control */ {"-crtscts", 0, setnocrtscts}, /* clear h/w flow control */ {"xonxoff", 0, setxonxoff}, /* set s/w flow control */ {"debug", 0, setdebug}, /* Increase debugging level */ {"kdebug", 1, setkdebug}, /* Enable kernel-level debugging */ {"domain", 1, setdomain}, /* Add given domain name to hostname*/ {"mru", 1, setmru}, /* Set MRU value for negotiation */ {"mtu", 1, setmtu}, /* Set our MTU */ {"netmask", 1, setnetmask}, /* set netmask */ {"passive", 0, setpassive}, /* Set passive mode */ {"silent", 0, setsilent}, /* Set silent mode */ {"modem", 0, setmodem}, /* Use modem control lines */ {"local", 0, setlocal}, /* Don't use modem control lines */ {"lock", 0, setlock}, /* Lock serial device (with lock file) */ {"name", 1, setname}, /* Set local name for authentication */ {"user", 1, setuser}, /* Set username for PAP auth with peer */ {"usehostname", 0, setusehostname}, /* Must use hostname for auth. */ {"remotename", 1, setremote}, /* Set remote name for authentication */ {"auth", 0, setauth}, /* Require authentication from peer */ {"file", 1, readfile}, /* Take options from a file */ {"defaultroute", 0, setdefaultroute}, /* Add default route */ {"nodefaultroute", 0, setnodefaultroute}, /* disable defaultroute option */ {"-defaultroute", 0, setnodefaultroute}, /* disable defaultroute option */ {"proxyarp", 0, setproxyarp}, /* Add proxy ARP entry */ {"noproxyarp", 0, setnoproxyarp}, /* disable proxyarp option */ {"-proxyarp", 0, setnoproxyarp}, /* disable proxyarp option */ {"persist", 0, setpersist}, /* Keep on reopening connection after close */ {"demand", 0, setdemand}, /* Dial on demand */ {"login", 0, setdologin}, /* Use system password database for UPAP */ {"noipdefault", 0, setnoipdflt}, /* Don't use name for default IP adrs */ {"lcp-echo-failure", 1, setlcpechofails}, /* consecutive echo failures */ {"lcp-echo-interval", 1, setlcpechointv}, /* time for lcp echo events */ {"lcp-restart", 1, setlcptimeout}, /* Set timeout for LCP */ {"lcp-max-terminate", 1, setlcpterm}, /* Set max #xmits for term-reqs */ {"lcp-max-configure", 1, setlcpconf}, /* Set max #xmits for conf-reqs */ {"lcp-max-failure", 1, setlcpfails}, /* Set max #conf-naks for LCP */ {"ipcp-restart", 1, setipcptimeout}, /* Set timeout for IPCP */ {"ipcp-max-terminate", 1, setipcpterm}, /* Set max #xmits for term-reqs */ {"ipcp-max-configure", 1, setipcpconf}, /* Set max #xmits for conf-reqs */ {"ipcp-max-failure", 1, setipcpfails}, /* Set max #conf-naks for IPCP */ {"pap-restart", 1, setpaptimeout}, /* Set retransmit timeout for PAP */ {"pap-max-authreq", 1, setpapreqs}, /* Set max #xmits for auth-reqs */ {"pap-timeout", 1, setpapreqtime}, /* Set time limit for peer PAP auth. */ {"chap-restart", 1, setchaptimeout}, /* Set timeout for CHAP */ {"chap-max-challenge", 1, setchapchal}, /* Set max #xmits for challenge */ {"chap-interval", 1, setchapintv}, /* Set interval for rechallenge */ {"ipcp-accept-local", 0, setipcpaccl}, /* Accept peer's address for us */ {"ipcp-accept-remote", 0, setipcpaccr}, /* Accept peer's address for it */ {"noccp", 0, noccp}, /* Disable CCP negotiation */ {"-ccp", 0, noccp}, /* Disable CCP negotiation */ {"bsdcomp", 1, setbsdcomp}, /* request BSD-Compress */ {"nobsdcomp", 0, setnobsdcomp}, /* don't allow BSD-Compress */ {"-bsdcomp", 0, setnobsdcomp}, /* don't allow BSD-Compress */ {"deflate", 1, setdeflate}, /* request Deflate compression */ {"nodeflate", 0, setnodeflate}, /* don't allow Deflate compression */ {"-deflate", 0, setnodeflate}, /* don't allow Deflate compression */ {"predictor1", 0, setpred1comp}, /* request Predictor-1 */ {"nopredictor1", 0, setnopred1comp},/* don't allow Predictor-1 */ {"-predictor1", 0, setnopred1comp}, /* don't allow Predictor-1 */ {"ipparam", 1, setipparam}, /* set ip script parameter */ {"papcrypt", 0, setpapcrypt}, /* PAP passwords encrypted */ {"idle", 1, setidle}, /* idle time limit (seconds) */ {"holdoff", 1, setholdoff}, /* set holdoff time (seconds) */ {"pass-filter", 1, setpassfilter}, /* set filter for packets to pass */ {"active-filter", 1, setactivefilter}, /* set filter for active pkts */ #ifdef IPX_CHANGE {"ipx-network", 1, setipxnetwork}, /* IPX network number */ {"ipxcp-accept-network", 0, setipxanet}, /* Accept peer netowrk */ {"ipx-node", 1, setipxnode}, /* IPX node number */ {"ipxcp-accept-local", 0, setipxalcl}, /* Accept our address */ {"ipxcp-accept-remote", 0, setipxarmt}, /* Accept peer's address */ {"ipx-routing", 1, setipxrouter}, /* IPX routing proto number */ {"ipx-router-name", 1, setipxname}, /* IPX router name */ {"ipxcp-restart", 1, setipxcptimeout}, /* Set timeout for IPXCP */ {"ipxcp-max-terminate", 1, setipxcpterm}, /* max #xmits for term-reqs */ {"ipxcp-max-configure", 1, setipxcpconf}, /* max #xmits for conf-reqs */ {"ipxcp-max-failure", 1, setipxcpfails}, /* max #conf-naks for IPXCP */ #if 0 {"ipx-compression", 1, setipxcompression}, /* IPX compression number */ #endif {"ipx", 0, setipxproto}, /* Enable IPXCP (and IPX) */ {"noipx", 0, resetipxproto}, /* Disable IPXCP (and IPX) */ {"+ipx", 0, setipxproto}, /* Enable IPXCP (and IPX) */ {"-ipx", 0, resetipxproto}, /* Disable IPXCP (and IPX) */ #endif /* IPX_CHANGE */ #ifdef _linux_ {"idle-disconnect", 1, setidle}, /* seconds for disconnect of idle IP */ #endif #ifdef USE_MS_DNS {"ms-dns", 1, setdnsaddr}, /* DNS address(es) for the peer's use */ #endif {NULL, 0, NULL} }; #ifndef IMPLEMENTATION #define IMPLEMENTATION "" #endif static char *usage_string = "\ pppd version %s patch level %d%s\n\ Usage: %s [ options ], where options are:\n\ Communicate over the named device\n\ Set the baud rate to \n\ : Set the local and/or remote interface IP\n\ addresses. Either one may be omitted.\n\ asyncmap Set the desired async map to hex \n\ auth Require authentication from peer\n\ connect

Invoke shell command

to set up the serial line\n\ crtscts Use hardware RTS/CTS flow control\n\ defaultroute Add default route through interface\n\ file Take options from file \n\ modem Use modem control lines\n\ mru Set MRU value to for negotiation\n\ netmask Set interface netmask to \n\ See pppd(8) for more options.\n\ "; static char *current_option; /* the name of the option being parsed */ /* * parse_args - parse a string of arguments, from the command * line or from a file. */ int parse_args(argc, argv) int argc; char **argv; { char *arg; struct cmd *cmdp; int ret; while (argc > 0) { arg = *argv++; --argc; /* * First see if it's a command. */ for (cmdp = cmds; cmdp->cmd_name; cmdp++) if (!strcmp(arg, cmdp->cmd_name)) break; if (cmdp->cmd_name != NULL) { if (argc < cmdp->num_args) { option_error("too few parameters for option %s", arg); return 0; } current_option = arg; if (!(*cmdp->cmd_func)(argv)) return 0; argc -= cmdp->num_args; argv += cmdp->num_args; } else { /* * Maybe a tty name, speed or IP address? */ if ((ret = setdevname(arg, 0)) == 0 && (ret = setspeed(arg)) == 0 && (ret = setipaddr(arg)) == 0) { option_error("unrecognized option '%s'", arg); usage(); return 0; } if (ret < 0) /* error */ return 0; } } return 1; } /* * scan_args - scan the command line arguments to get the tty name, * if specified. */ void scan_args(argc, argv) int argc; char **argv; { char *arg; struct cmd *cmdp; while (argc > 0) { arg = *argv++; --argc; /* Skip options and their arguments */ for (cmdp = cmds; cmdp->cmd_name; cmdp++) if (!strcmp(arg, cmdp->cmd_name)) break; if (cmdp->cmd_name != NULL) { argc -= cmdp->num_args; argv += cmdp->num_args; continue; } /* Check if it's a tty name and copy it if so */ (void) setdevname(arg, 1); } } /* * usage - print out a message telling how to use the program. */ void usage() { if (phase == PHASE_INITIALIZE) fprintf(stderr, usage_string, VERSION, PATCHLEVEL, IMPLEMENTATION, progname); } /* * options_from_file - Read a string of options from a file, * and interpret them. */ int options_from_file(filename, must_exist, check_prot) char *filename; int must_exist; int check_prot; { FILE *f; int i, newline, ret; struct cmd *cmdp; char *argv[MAXARGS]; char args[MAXARGS][MAXWORDLEN]; char cmd[MAXWORDLEN]; if ((f = fopen(filename, "r")) == NULL) { if (!must_exist && errno == ENOENT) return 1; option_error("Can't open options file %s: %m", filename); return 0; } if (check_prot && !readable(fileno(f))) { option_error("Can't open options file %s: access denied", filename); fclose(f); return 0; } while (getword(f, cmd, &newline, filename)) { /* * First see if it's a command. */ for (cmdp = cmds; cmdp->cmd_name; cmdp++) if (!strcmp(cmd, cmdp->cmd_name)) break; if (cmdp->cmd_name != NULL) { for (i = 0; i < cmdp->num_args; ++i) { if (!getword(f, args[i], &newline, filename)) { option_error( "In file %s: too few parameters for option '%s'", filename, cmd); fclose(f); return 0; } argv[i] = args[i]; } current_option = cmd; if (!(*cmdp->cmd_func)(argv)) { fclose(f); return 0; } } else { /* * Maybe a tty name, speed or IP address? */ if ((ret = setdevname(cmd, 0)) == 0 && (ret = setspeed(cmd)) == 0 && (ret = setipaddr(cmd)) == 0) { option_error("In file %s: unrecognized option '%s'", filename, cmd); fclose(f); return 0; } if (ret < 0) /* error */ return 0; } } return 1; } /* * options_from_user - See if the use has a ~/.ppprc file, * and if so, interpret options from it. */ int options_from_user() { char *user, *path, *file; int ret; struct passwd *pw; pw = getpwuid(getuid()); if (pw == NULL || (user = pw->pw_dir) == NULL || user[0] == 0) return 1; file = _PATH_USEROPT; path = malloc(strlen(user) + strlen(file) + 2); if (path == NULL) novm("init file name"); strcpy(path, user); strcat(path, "/"); strcat(path, file); ret = options_from_file(path, 0, 1); free(path); return ret; } /* * options_for_tty - See if an options file exists for the serial * device, and if so, interpret options from it. */ int options_for_tty() { char *dev, *path, *p; int ret; dev = devnam; if (strncmp(dev, "/dev/", 5) == 0) dev += 5; if (strcmp(dev, "tty") == 0) return 1; /* don't look for /etc/ppp/options.tty */ path = malloc(strlen(_PATH_TTYOPT) + strlen(dev) + 1); if (path == NULL) novm("tty init file name"); strcpy(path, _PATH_TTYOPT); /* Turn slashes into dots, for Solaris case (e.g. /dev/term/a) */ for (p = path + strlen(path); *dev != 0; ++dev) *p++ = (*dev == '/'? '.': *dev); *p = 0; ret = options_from_file(path, 0, 0); free(path); return ret; } /* * option_error - print a message about an error in an option. * The message is logged, and also sent to * stderr if phase == PHASE_INITIALIZE. */ void option_error __V((char *fmt, ...)) { va_list args; int n; char buf[256]; #if __STDC__ va_start(args, fmt); #else char *fmt; va_start(args); fmt = va_arg(args, char *); #endif vfmtmsg(buf, sizeof(buf), fmt, args); va_end(args); if (phase == PHASE_INITIALIZE) fprintf(stderr, "%s: %s\n", progname, buf); syslog(LOG_ERR, "%s", buf); } /* * readable - check if a file is readable by the real user. */ static int readable(fd) int fd; { uid_t uid; int ngroups, i; struct stat sbuf; GIDSET_TYPE groups[NGROUPS_MAX]; uid = getuid(); if (uid == 0) return 1; if (fstat(fd, &sbuf) != 0) return 0; if (sbuf.st_uid == uid) return sbuf.st_mode & S_IRUSR; if (sbuf.st_gid == getgid()) return sbuf.st_mode & S_IRGRP; ngroups = getgroups(NGROUPS_MAX, groups); for (i = 0; i < ngroups; ++i) if (sbuf.st_gid == groups[i]) return sbuf.st_mode & S_IRGRP; return sbuf.st_mode & S_IROTH; } /* * Read a word from a file. * Words are delimited by white-space or by quotes (" or '). * Quotes, white-space and \ may be escaped with \. * \ is ignored. */ int getword(f, word, newlinep, filename) FILE *f; char *word; int *newlinep; char *filename; { int c, len, escape; int quoted, comment; int value, digit, got, n; #define isoctal(c) ((c) >= '0' && (c) < '8') *newlinep = 0; len = 0; escape = 0; comment = 0; /* * First skip white-space and comments. */ for (;;) { c = getc(f); if (c == EOF) break; /* * A newline means the end of a comment; backslash-newline * is ignored. Note that we cannot have escape && comment. */ if (c == '\n') { if (!escape) { *newlinep = 1; comment = 0; } else escape = 0; continue; } /* * Ignore characters other than newline in a comment. */ if (comment) continue; /* * If this character is escaped, we have a word start. */ if (escape) break; /* * If this is the escape character, look at the next character. */ if (c == '\\') { escape = 1; continue; } /* * If this is the start of a comment, ignore the rest of the line. */ if (c == '#') { comment = 1; continue; } /* * A non-whitespace character is the start of a word. */ if (!isspace(c)) break; } /* * Save the delimiter for quoted strings. */ if (!escape && (c == '"' || c == '\'')) { quoted = c; c = getc(f); } else quoted = 0; /* * Process characters until the end of the word. */ while (c != EOF) { if (escape) { /* * This character is escaped: backslash-newline is ignored, * various other characters indicate particular values * as for C backslash-escapes. */ escape = 0; if (c == '\n') { c = getc(f); continue; } got = 0; switch (c) { case 'a': value = '\a'; break; case 'b': value = '\b'; break; case 'f': value = '\f'; break; case 'n': value = '\n'; break; case 'r': value = '\r'; break; case 's': value = ' '; break; case 't': value = '\t'; break; default: if (isoctal(c)) { /* * \ddd octal sequence */ value = 0; for (n = 0; n < 3 && isoctal(c); ++n) { value = (value << 3) + (c & 07); c = getc(f); } got = 1; break; } if (c == 'x') { /* * \x sequence */ value = 0; c = getc(f); for (n = 0; n < 2 && isxdigit(c); ++n) { digit = toupper(c) - '0'; if (digit > 10) digit += '0' + 10 - 'A'; value = (value << 4) + digit; c = getc (f); } got = 1; break; } /* * Otherwise the character stands for itself. */ value = c; break; } /* * Store the resulting character for the escape sequence. */ if (len < MAXWORDLEN-1) word[len] = value; ++len; if (!got) c = getc(f); continue; } /* * Not escaped: see if we've reached the end of the word. */ if (quoted) { if (c == quoted) break; } else { if (isspace(c) || c == '#') { ungetc (c, f); break; } } /* * Backslash starts an escape sequence. */ if (c == '\\') { escape = 1; c = getc(f); continue; } /* * An ordinary character: store it in the word and get another. */ if (len < MAXWORDLEN-1) word[len] = c; ++len; c = getc(f); } /* * End of the word: check for errors. */ if (c == EOF) { if (ferror(f)) { if (errno == 0) errno = EIO; option_error("Error reading %s: %m", filename); die(1); } /* * If len is zero, then we didn't find a word before the * end of the file. */ if (len == 0) return 0; } /* * Warn if the word was too long, and append a terminating null. */ if (len >= MAXWORDLEN) { option_error("warning: word in file %s too long (%.20s...)", filename, word); len = MAXWORDLEN - 1; } word[len] = 0; return 1; #undef isoctal } /* * number_option - parse an unsigned numeric parameter for an option. */ static int number_option(str, valp, base) char *str; u_int32_t *valp; int base; { char *ptr; *valp = strtoul(str, &ptr, base); if (ptr == str) { option_error("invalid numeric parameter '%s' for %s option", str, current_option); return 0; } return 1; } /* * int_option - like number_option, but valp is int *, * the base is assumed to be 0, and *valp is not changed * if there is an error. */ static int int_option(str, valp) char *str; int *valp; { u_int32_t v; if (!number_option(str, &v, 0)) return 0; *valp = (int) v; return 1; } /* * The following procedures execute commands. */ /* * readfile - take commands from a file. */ static int readfile(argv) char **argv; { return options_from_file(*argv, 1, 1); } /* * setdebug - Set debug (command line argument). */ static int setdebug() { debug++; return (1); } /* * setkdebug - Set kernel debugging level. */ static int setkdebug(argv) char **argv; { return int_option(*argv, &kdebugflag); } /* * noopt - Disable all options. */ static int noopt() { BZERO((char *) &lcp_wantoptions[0], sizeof (struct lcp_options)); BZERO((char *) &lcp_allowoptions[0], sizeof (struct lcp_options)); BZERO((char *) &ipcp_wantoptions[0], sizeof (struct ipcp_options)); BZERO((char *) &ipcp_allowoptions[0], sizeof (struct ipcp_options)); #ifdef IPX_CHANGE BZERO((char *) &ipxcp_wantoptions[0], sizeof (struct ipxcp_options)); BZERO((char *) &ipxcp_allowoptions[0], sizeof (struct ipxcp_options)); #endif /* IPX_CHANGE */ return (1); } /* * noaccomp - Disable Address/Control field compression negotiation. */ static int noaccomp() { lcp_wantoptions[0].neg_accompression = 0; lcp_allowoptions[0].neg_accompression = 0; return (1); } /* * noasyncmap - Disable async map negotiation. */ static int noasyncmap() { lcp_wantoptions[0].neg_asyncmap = 0; lcp_allowoptions[0].neg_asyncmap = 0; return (1); } /* * noip - Disable IP and IPCP. */ static int noip() { ipcp_protent.enabled_flag = 0; return (1); } /* * nomagicnumber - Disable magic number negotiation. */ static int nomagicnumber() { lcp_wantoptions[0].neg_magicnumber = 0; lcp_allowoptions[0].neg_magicnumber = 0; return (1); } /* * nomru - Disable mru negotiation. */ static int nomru() { lcp_wantoptions[0].neg_mru = 0; lcp_allowoptions[0].neg_mru = 0; return (1); } /* * setmru - Set MRU for negotiation. */ static int setmru(argv) char **argv; { u_int32_t mru; if (!number_option(*argv, &mru, 0)) return 0; lcp_wantoptions[0].mru = mru; lcp_wantoptions[0].neg_mru = 1; return (1); } /* * setmru - Set the largest MTU we'll use. */ static int setmtu(argv) char **argv; { u_int32_t mtu; if (!number_option(*argv, &mtu, 0)) return 0; if (mtu < MINMRU || mtu > MAXMRU) { option_error("mtu option value of %u is too %s", mtu, (mtu < MINMRU? "small": "large")); return 0; } lcp_allowoptions[0].mru = mtu; return (1); } /* * nopcomp - Disable Protocol field compression negotiation. */ static int nopcomp() { lcp_wantoptions[0].neg_pcompression = 0; lcp_allowoptions[0].neg_pcompression = 0; return (1); } /* * setpassive - Set passive mode (don't give up if we time out sending * LCP configure-requests). */ static int setpassive() { lcp_wantoptions[0].passive = 1; return (1); } /* * setsilent - Set silent mode (don't start sending LCP configure-requests * until we get one from the peer). */ static int setsilent() { lcp_wantoptions[0].silent = 1; return 1; } /* * nopap - Disable PAP authentication with peer. */ static int nopap() { refuse_pap = 1; return (1); } /* * reqpap - Require PAP authentication from peer. */ static int reqpap() { lcp_wantoptions[0].neg_upap = 1; auth_required = 1; return 1; } #if OLD_OPTIONS /* * setupapfile - specifies UPAP info for authenticating with peer. */ static int setupapfile(argv) char **argv; { FILE * ufile; int l; lcp_allowoptions[0].neg_upap = 1; /* open user info file */ if ((ufile = fopen(*argv, "r")) == NULL) { fprintf(stderr, "unable to open user login data file %s\n", *argv); return 0; } if (!readable(fileno(ufile))) { option_error("unable to open user login data file %s", *argv); return 0; } check_access(ufile, *argv); /* get username */ if (fgets(user, MAXNAMELEN - 1, ufile) == NULL || fgets(passwd, MAXSECRETLEN - 1, ufile) == NULL){ option_error("%s: access denied", *argv); return 0; } fclose(ufile); /* get rid of newlines */ l = strlen(user); if (l > 0 && user[l-1] == '\n') user[l-1] = 0; l = strlen(passwd); if (l > 0 && passwd[l-1] == '\n') passwd[l-1] = 0; return (1); } #endif /* * nochap - Disable CHAP authentication with peer. */ static int nochap() { refuse_chap = 1; return (1); } /* * reqchap - Require CHAP authentication from peer. */ static int reqchap() { lcp_wantoptions[0].neg_chap = 1; auth_required = 1; return (1); } /* * setnovj - disable vj compression */ static int setnovj() { ipcp_wantoptions[0].neg_vj = 0; ipcp_allowoptions[0].neg_vj = 0; return (1); } /* * setnovjccomp - disable VJ connection-ID compression */ static int setnovjccomp() { ipcp_wantoptions[0].cflag = 0; ipcp_allowoptions[0].cflag = 0; return 1; } /* * 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; } /* * setconnector - Set a program to connect to a serial line */ static int setconnector(argv) char **argv; { connector = strdup(*argv); if (connector == NULL) novm("connect script"); return (1); } /* * setdisconnector - Set a program to disconnect from the serial line */ static int setdisconnector(argv) char **argv; { disconnector = strdup(*argv); if (disconnector == NULL) novm("disconnect script"); return (1); } /* * setwelcomer - Set a program to welcome a client after connection */ static int setwelcomer(argv) char **argv; { welcomer = strdup(*argv); if (welcomer == NULL) novm("welcome script"); return (1); } /* * setmaxconnect - Set the maximum connect time */ static int setmaxconnect(argv) char **argv; { int value; if (!int_option(*argv, &value)) return 0; if (value < 0) { option_error("maxconnect time must be positive"); return 0; } maxconnect = value; return 1; } /* * setdomain - Set domain name to append to hostname */ static int setdomain(argv) char **argv; { gethostname(hostname, MAXNAMELEN); if (**argv != 0) { if (**argv != '.') strncat(hostname, ".", MAXNAMELEN - strlen(hostname)); strncat(hostname, *argv, MAXNAMELEN - strlen(hostname)); } hostname[MAXNAMELEN-1] = 0; return (1); } /* * setasyncmap - add bits to asyncmap (what we request peer to escape). */ static int setasyncmap(argv) char **argv; { u_int32_t asyncmap; if (!number_option(*argv, &asyncmap, 16)) return 0; lcp_wantoptions[0].asyncmap |= asyncmap; lcp_wantoptions[0].neg_asyncmap = 1; return(1); } /* * setescape - add chars to the set we escape on transmission. */ static int setescape(argv) char **argv; { int n, ret; char *p, *endp; p = *argv; ret = 1; while (*p) { n = strtol(p, &endp, 16); if (p == endp) { option_error("escape parameter contains invalid hex number '%s'", p); return 0; } p = endp; if (n < 0 || 0x20 <= n && n <= 0x3F || n == 0x5E || n > 0xFF) { option_error("can't escape character 0x%x", n); ret = 0; } else xmit_accm[0][n >> 5] |= 1 << (n & 0x1F); while (*p == ',' || *p == ' ') ++p; } return ret; } /* * setspeed - Set the speed. */ static int setspeed(arg) char *arg; { char *ptr; int spd; spd = strtol(arg, &ptr, 0); if (ptr == arg || *ptr != 0 || spd == 0) return 0; inspeed = spd; return 1; } /* * setdevname - Set the device name. */ static int setdevname(cp, quiet) char *cp; int quiet; { struct stat statbuf; char dev[MAXPATHLEN]; if (*cp == 0) return 0; if (strncmp("/dev/", cp, 5) != 0) { strcpy(dev, "/dev/"); strncat(dev, cp, MAXPATHLEN - 5); dev[MAXPATHLEN-1] = 0; cp = dev; } /* * Check if there is a device by this name. */ if (stat(cp, &statbuf) < 0) { if (errno == ENOENT || quiet) return 0; option_error("Couldn't stat %s: %m", cp); return -1; } (void) strncpy(devnam, cp, MAXPATHLEN); devnam[MAXPATHLEN-1] = 0; default_device = FALSE; return 1; } /* * setipaddr - Set the IP address */ static int setipaddr(arg) char *arg; { struct hostent *hp; char *colon; u_int32_t local, remote; ipcp_options *wo = &ipcp_wantoptions[0]; /* * IP address pair separated by ":". */ if ((colon = strchr(arg, ':')) == NULL) return 0; /* * If colon first character, then no local addr. */ if (colon != arg) { *colon = '\0'; if ((local = inet_addr(arg)) == -1) { if ((hp = gethostbyname(arg)) == NULL) { option_error("unknown host: %s", arg); return -1; } else { local = *(u_int32_t *)hp->h_addr; if (our_name[0] == 0) { strncpy(our_name, arg, MAXNAMELEN); our_name[MAXNAMELEN-1] = 0; } } } if (bad_ip_adrs(local)) { option_error("bad local IP address %s", ip_ntoa(local)); return -1; } if (local != 0) wo->ouraddr = local; *colon = ':'; } /* * If colon last character, then no remote addr. */ if (*++colon != '\0') { if ((remote = inet_addr(colon)) == -1) { if ((hp = gethostbyname(colon)) == NULL) { option_error("unknown host: %s", colon); return -1; } else { remote = *(u_int32_t *)hp->h_addr; if (remote_name[0] == 0) { strncpy(remote_name, colon, MAXNAMELEN); remote_name[MAXNAMELEN-1] = 0; } } } if (bad_ip_adrs(remote)) { option_error("bad remote IP address %s", ip_ntoa(remote)); return -1; } if (remote != 0) wo->hisaddr = remote; } return 1; } /* * setnoipdflt - disable setipdefault() */ static int setnoipdflt() { disable_defaultip = 1; return 1; } /* * setipcpaccl - accept peer's idea of our address */ static int setipcpaccl() { ipcp_wantoptions[0].accept_local = 1; return 1; } /* * setipcpaccr - accept peer's idea of its address */ static int setipcpaccr() { ipcp_wantoptions[0].accept_remote = 1; return 1; } /* * setnetmask - set the netmask to be used on the interface. */ static int setnetmask(argv) char **argv; { u_int32_t mask; if ((mask = inet_addr(*argv)) == -1 || (netmask & ~mask) != 0) { option_error("invalid netmask value '%s'", *argv); return 0; } netmask = mask; return (1); } static int setcrtscts() { crtscts = 1; return (1); } static int setnocrtscts() { crtscts = -1; return (1); } static int setxonxoff() { lcp_wantoptions[0].asyncmap |= 0x000A0000; /* escape ^S and ^Q */ lcp_wantoptions[0].neg_asyncmap = 1; crtscts = -2; return (1); } static int setnodetach() { nodetach = 1; return (1); } static int setdemand() { demand = 1; return 1; } static int setmodem() { modem = 1; return 1; } static int setlocal() { modem = 0; return 1; } static int setlock() { lockflag = 1; return 1; } static int setusehostname() { usehostname = 1; return 1; } static int setname(argv) char **argv; { if (our_name[0] == 0) { strncpy(our_name, argv[0], MAXNAMELEN); our_name[MAXNAMELEN-1] = 0; } return 1; } static int setuser(argv) char **argv; { strncpy(user, argv[0], MAXNAMELEN); user[MAXNAMELEN-1] = 0; return 1; } static int setremote(argv) char **argv; { strncpy(remote_name, argv[0], MAXNAMELEN); remote_name[MAXNAMELEN-1] = 0; return 1; } static int setauth() { auth_required = 1; return 1; } static int setdefaultroute() { if (!ipcp_allowoptions[0].default_route) { option_error("defaultroute option is disabled"); return 0; } ipcp_wantoptions[0].default_route = 1; return 1; } static int setnodefaultroute() { ipcp_allowoptions[0].default_route = 0; ipcp_wantoptions[0].default_route = 0; return 1; } static int setproxyarp() { if (!ipcp_allowoptions[0].proxy_arp) { option_error("proxyarp option is disabled"); return 0; } ipcp_wantoptions[0].proxy_arp = 1; return 1; } static int setnoproxyarp() { ipcp_wantoptions[0].proxy_arp = 0; ipcp_allowoptions[0].proxy_arp = 0; return 1; } static int setpersist() { persist = 1; return 1; } static int setdologin() { uselogin = 1; return 1; } /* * Functions to set the echo interval for modem-less monitors */ static int setlcpechointv(argv) char **argv; { return int_option(*argv, &lcp_echo_interval); } static int setlcpechofails(argv) char **argv; { return int_option(*argv, &lcp_echo_fails); } /* * Functions to set timeouts, max transmits, etc. */ static int setlcptimeout(argv) char **argv; { return int_option(*argv, &lcp_fsm[0].timeouttime); } static int setlcpterm(argv) char **argv; { return int_option(*argv, &lcp_fsm[0].maxtermtransmits); } static int setlcpconf(argv) char **argv; { return int_option(*argv, &lcp_fsm[0].maxconfreqtransmits); } static int setlcpfails(argv) char **argv; { return int_option(*argv, &lcp_fsm[0].maxnakloops); } static int setipcptimeout(argv) char **argv; { return int_option(*argv, &ipcp_fsm[0].timeouttime); } static int setipcpterm(argv) char **argv; { return int_option(*argv, &ipcp_fsm[0].maxtermtransmits); } static int setipcpconf(argv) char **argv; { return int_option(*argv, &ipcp_fsm[0].maxconfreqtransmits); } static int setipcpfails(argv) char **argv; { return int_option(*argv, &lcp_fsm[0].maxnakloops); } static int setpaptimeout(argv) char **argv; { return int_option(*argv, &upap[0].us_timeouttime); } static int setpapreqtime(argv) char **argv; { return int_option(*argv, &upap[0].us_reqtimeout); } static int setpapreqs(argv) char **argv; { return int_option(*argv, &upap[0].us_maxtransmits); } static int setchaptimeout(argv) char **argv; { return int_option(*argv, &chap[0].timeouttime); } static int setchapchal(argv) char **argv; { return int_option(*argv, &chap[0].max_transmits); } static int setchapintv(argv) char **argv; { return int_option(*argv, &chap[0].chal_interval); } static int noccp() { ccp_protent.enabled_flag = 0; return 1; } static int setbsdcomp(argv) char **argv; { int rbits, abits; char *str, *endp; str = *argv; abits = rbits = strtol(str, &endp, 0); if (endp != str && *endp == ',') { str = endp + 1; abits = strtol(str, &endp, 0); } if (*endp != 0 || endp == str) { option_error("invalid parameter '%s' for bsdcomp option", *argv); return 0; } if (rbits != 0 && (rbits < BSD_MIN_BITS || rbits > BSD_MAX_BITS) || abits != 0 && (abits < BSD_MIN_BITS || abits > BSD_MAX_BITS)) { option_error("bsdcomp option values must be 0 or %d .. %d", BSD_MIN_BITS, BSD_MAX_BITS); return 0; } if (rbits > 0) { ccp_wantoptions[0].bsd_compress = 1; ccp_wantoptions[0].bsd_bits = rbits; } else ccp_wantoptions[0].bsd_compress = 0; if (abits > 0) { ccp_allowoptions[0].bsd_compress = 1; ccp_allowoptions[0].bsd_bits = abits; } else ccp_allowoptions[0].bsd_compress = 0; return 1; } static int setnobsdcomp() { ccp_wantoptions[0].bsd_compress = 0; ccp_allowoptions[0].bsd_compress = 0; return 1; } static int setdeflate(argv) char **argv; { int rbits, abits; char *str, *endp; str = *argv; abits = rbits = strtol(str, &endp, 0); if (endp != str && *endp == ',') { str = endp + 1; abits = strtol(str, &endp, 0); } if (*endp != 0 || endp == str) { option_error("invalid parameter '%s' for deflate option", *argv); return 0; } if (rbits != 0 && (rbits < DEFLATE_MIN_SIZE || rbits > DEFLATE_MAX_SIZE) || abits != 0 && (abits < DEFLATE_MIN_SIZE || abits > DEFLATE_MAX_SIZE)) { option_error("deflate option values must be 0 or %d .. %d", DEFLATE_MIN_SIZE, DEFLATE_MAX_SIZE); return 0; } if (rbits > 0) { ccp_wantoptions[0].deflate = 1; ccp_wantoptions[0].deflate_size = rbits; } else ccp_wantoptions[0].deflate = 0; if (abits > 0) { ccp_allowoptions[0].deflate = 1; ccp_allowoptions[0].deflate_size = abits; } else ccp_allowoptions[0].deflate = 0; return 1; } static int setnodeflate() { ccp_wantoptions[0].deflate = 0; ccp_allowoptions[0].deflate = 0; return 1; } static int setpred1comp() { ccp_wantoptions[0].predictor_1 = 1; ccp_allowoptions[0].predictor_1 = 1; return 1; } static int setnopred1comp() { ccp_wantoptions[0].predictor_1 = 0; ccp_allowoptions[0].predictor_1 = 0; return 1; } static int setipparam(argv) char **argv; { ipparam = strdup(*argv); if (ipparam == NULL) novm("ipparam string"); return 1; } static int setpapcrypt() { cryptpap = 1; return 1; } static int setidle(argv) char **argv; { return int_option(*argv, &idle_time_limit); } static int setholdoff(argv) char **argv; { return int_option(*argv, &holdoff); } static int setpassfilter(argv) char **argv; { if (bpf_compile(&pass_filter, *argv, 1) == 0) return 1; fprintf(stderr, "%s: error in pass-filter expression: %s\n", progname, bpf_geterr()); return 0; } static int setactivefilter(argv) char **argv; { if (bpf_compile(&active_filter, *argv, 1) == 0) return 1; fprintf(stderr, "%s: error in active-filter expression: %s\n", progname, bpf_geterr()); return 0; } #ifdef IPX_CHANGE static int setipxrouter (argv) char **argv; { ipxcp_wantoptions[0].neg_router = 1; ipxcp_allowoptions[0].neg_router = 1; return int_option(*argv, &ipxcp_wantoptions[0].router); } static int setipxname (argv) char **argv; { char *dest = ipxcp_wantoptions[0].name; char *src = *argv; int count; char ch; ipxcp_wantoptions[0].neg_name = 1; ipxcp_allowoptions[0].neg_name = 1; memset (dest, '\0', sizeof (ipxcp_wantoptions[0].name)); count = 0; while (*src) { ch = *src++; if (! isalnum (ch) && ch != '_') { option_error("IPX router name must be alphanumeric or _"); return 0; } if (count >= sizeof (ipxcp_wantoptions[0].name)) { option_error("IPX router name is limited to %d characters", sizeof (ipxcp_wantoptions[0].name) - 1); return 0; } dest[count++] = toupper (ch); } return 1; } static int setipxcptimeout (argv) char **argv; { return int_option(*argv, &ipxcp_fsm[0].timeouttime); } static int setipxcpterm (argv) char **argv; { return int_option(*argv, &ipxcp_fsm[0].maxtermtransmits); } static int setipxcpconf (argv) char **argv; { return int_option(*argv, &ipxcp_fsm[0].maxconfreqtransmits); } static int setipxcpfails (argv) char **argv; { return int_option(*argv, &ipxcp_fsm[0].maxnakloops); } static int setipxnetwork(argv) char **argv; { ipxcp_wantoptions[0].neg_nn = 1; return int_option(*argv, &ipxcp_wantoptions[0].our_network); } static int setipxanet() { ipxcp_wantoptions[0].accept_network = 1; ipxcp_allowoptions[0].accept_network = 1; } static int setipxalcl() { ipxcp_wantoptions[0].accept_local = 1; ipxcp_allowoptions[0].accept_local = 1; } static int setipxarmt() { ipxcp_wantoptions[0].accept_remote = 1; ipxcp_allowoptions[0].accept_remote = 1; } static u_char * setipxnodevalue(src,dst) u_char *src, *dst; { int indx; int item; for (;;) { if (!isxdigit (*src)) break; for (indx = 0; indx < 5; ++indx) { dst[indx] <<= 4; dst[indx] |= (dst[indx + 1] >> 4) & 0x0F; } item = toupper (*src) - '0'; if (item > 9) item -= 7; dst[5] = (dst[5] << 4) | item; ++src; } return src; } static int setipxnode(argv) char **argv; { char *end; memset (&ipxcp_wantoptions[0].our_node[0], 0, 6); memset (&ipxcp_wantoptions[0].his_node[0], 0, 6); end = setipxnodevalue (*argv, &ipxcp_wantoptions[0].our_node[0]); if (*end == ':') end = setipxnodevalue (++end, &ipxcp_wantoptions[0].his_node[0]); if (*end == '\0') { ipxcp_wantoptions[0].neg_node = 1; return 1; } option_error("invalid parameter '%s' for ipx-node option", *argv); return 0; } static int setipxproto() { ipxcp_protent.enabled_flag = 1; return 1; } static int resetipxproto() { ipxcp_protent.enabled_flag = 0; return 1; } #endif /* IPX_CHANGE */ #ifdef USE_MS_DNS /* * setdnsaddr - set the dns address(es) */ static int setdnsaddr(argv) char **argv; { u_int32_t dns; struct hostent *hp; dns = inet_addr(*argv); if (dns == -1) { if ((hp = gethostbyname(*argv)) == NULL) { option_error("invalid address parameter '%s' for ms-dns option", *argv); return 0; } dns = *(u_int32_t *)hp->h_addr; } if (ipcp_allowoptions[0].dnsaddr[0] == 0) { ipcp_allowoptions[0].dnsaddr[0] = dns; } else { ipcp_allowoptions[0].dnsaddr[1] = dns; } return (1); } #endif /* USE_MS_DNS */