/* * Copyright (c) 1988, 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "telnet_locl.h" RCSID("$Id$"); #if defined(IPPROTO_IP) && defined(IP_TOS) int tos = -1; #endif /* defined(IPPROTO_IP) && defined(IP_TOS) */ char *hostname; static char _hostname[MaxHostNameLen]; typedef int (*intrtn_t)(int, char**); static int call(intrtn_t, ...); typedef struct { char *name; /* command name */ char *help; /* help string (NULL for no help) */ int (*handler)(); /* routine which executes command */ int needconnect; /* Do we need to be connected to execute? */ } Command; static char line[256]; static char saveline[256]; static int margc; static char *margv[20]; static void makeargv() { char *cp, *cp2, c; char **argp = margv; margc = 0; cp = line; if (*cp == '!') { /* Special case shell escape */ /* save for shell command */ strlcpy(saveline, line, sizeof(saveline)); *argp++ = "!"; /* No room in string to get this */ margc++; cp++; } while ((c = *cp)) { int inquote = 0; while (isspace((unsigned char)c)) c = *++cp; if (c == '\0') break; *argp++ = cp; margc += 1; for (cp2 = cp; c != '\0'; c = *++cp) { if (inquote) { if (c == inquote) { inquote = 0; continue; } } else { if (c == '\\') { if ((c = *++cp) == '\0') break; } else if (c == '"') { inquote = '"'; continue; } else if (c == '\'') { inquote = '\''; continue; } else if (isspace((unsigned char)c)) break; } *cp2++ = c; } *cp2 = '\0'; if (c == '\0') break; cp++; } *argp++ = 0; } /* * Make a character string into a number. * * Todo: 1. Could take random integers (12, 0x12, 012, 0b1). */ static char special(char *s) { char c; char b; switch (*s) { case '^': b = *++s; if (b == '?') { c = b | 0x40; /* DEL */ } else { c = b & 0x1f; } break; default: c = *s; break; } return c; } /* * Construct a control character sequence * for a special character. */ static char * control(cc_t c) { static char buf[5]; /* * The only way I could get the Sun 3.5 compiler * to shut up about * if ((unsigned int)c >= 0x80) * was to assign "c" to an unsigned int variable... * Arggg.... */ unsigned int uic = (unsigned int)c; if (uic == 0x7f) return ("^?"); if (c == (cc_t)_POSIX_VDISABLE) { return "off"; } if (uic >= 0x80) { buf[0] = '\\'; buf[1] = ((c>>6)&07) + '0'; buf[2] = ((c>>3)&07) + '0'; buf[3] = (c&07) + '0'; buf[4] = 0; } else if (uic >= 0x20) { buf[0] = c; buf[1] = 0; } else { buf[0] = '^'; buf[1] = '@'+c; buf[2] = 0; } return (buf); } /* * The following are data structures and routines for * the "send" command. * */ struct sendlist { char *name; /* How user refers to it (case independent) */ char *help; /* Help information (0 ==> no help) */ int needconnect; /* Need to be connected */ int narg; /* Number of arguments */ int (*handler)(); /* Routine to perform (for special ops) */ int nbyte; /* Number of bytes to send this command */ int what; /* Character to be sent (<0 ==> special) */ }; static int send_esc (void), send_help (void), send_docmd (char *), send_dontcmd (char *), send_willcmd (char *), send_wontcmd (char *); static struct sendlist Sendlist[] = { { "ao", "Send Telnet Abort output", 1, 0, 0, 2, AO }, { "ayt", "Send Telnet 'Are You There'", 1, 0, 0, 2, AYT }, { "brk", "Send Telnet Break", 1, 0, 0, 2, BREAK }, { "break", 0, 1, 0, 0, 2, BREAK }, { "ec", "Send Telnet Erase Character", 1, 0, 0, 2, EC }, { "el", "Send Telnet Erase Line", 1, 0, 0, 2, EL }, { "escape", "Send current escape character", 1, 0, send_esc, 1, 0 }, { "ga", "Send Telnet 'Go Ahead' sequence", 1, 0, 0, 2, GA }, { "ip", "Send Telnet Interrupt Process", 1, 0, 0, 2, IP }, { "intp", 0, 1, 0, 0, 2, IP }, { "interrupt", 0, 1, 0, 0, 2, IP }, { "intr", 0, 1, 0, 0, 2, IP }, { "nop", "Send Telnet 'No operation'", 1, 0, 0, 2, NOP }, { "eor", "Send Telnet 'End of Record'", 1, 0, 0, 2, EOR }, { "abort", "Send Telnet 'Abort Process'", 1, 0, 0, 2, ABORT }, { "susp", "Send Telnet 'Suspend Process'", 1, 0, 0, 2, SUSP }, { "eof", "Send Telnet End of File Character", 1, 0, 0, 2, xEOF }, { "synch", "Perform Telnet 'Synch operation'", 1, 0, dosynch, 2, 0 }, { "getstatus", "Send request for STATUS", 1, 0, get_status, 6, 0 }, { "?", "Display send options", 0, 0, send_help, 0, 0 }, { "help", 0, 0, 0, send_help, 0, 0 }, { "do", 0, 0, 1, send_docmd, 3, 0 }, { "dont", 0, 0, 1, send_dontcmd, 3, 0 }, { "will", 0, 0, 1, send_willcmd, 3, 0 }, { "wont", 0, 0, 1, send_wontcmd, 3, 0 }, { 0 } }; #define GETSEND(name) ((struct sendlist *) genget(name, (char **) Sendlist, \ sizeof(struct sendlist))) static int sendcmd(int argc, char **argv) { int count; /* how many bytes we are going to need to send */ int i; struct sendlist *s; /* pointer to current command */ int success = 0; int needconnect = 0; if (argc < 2) { printf("need at least one argument for 'send' command\r\n"); printf("'send ?' for help\r\n"); return 0; } /* * First, validate all the send arguments. * In addition, we see how much space we are going to need, and * whether or not we will be doing a "SYNCH" operation (which * flushes the network queue). */ count = 0; for (i = 1; i < argc; i++) { s = GETSEND(argv[i]); if (s == 0) { printf("Unknown send argument '%s'\r\n'send ?' for help.\r\n", argv[i]); return 0; } else if (Ambiguous(s)) { printf("Ambiguous send argument '%s'\r\n'send ?' for help.\r\n", argv[i]); return 0; } if (i + s->narg >= argc) { fprintf(stderr, "Need %d argument%s to 'send %s' command. 'send %s ?' for help.\r\n", s->narg, s->narg == 1 ? "" : "s", s->name, s->name); return 0; } count += s->nbyte; if (s->handler == send_help) { send_help(); return 0; } i += s->narg; needconnect += s->needconnect; } if (!connected && needconnect) { printf("?Need to be connected first.\r\n"); printf("'send ?' for help\r\n"); return 0; } /* Now, do we have enough room? */ if (NETROOM() < count) { printf("There is not enough room in the buffer TO the network\r\n"); printf("to process your request. Nothing will be done.\r\n"); printf("('send synch' will throw away most data in the network\r\n"); printf("buffer, if this might help.)\r\n"); return 0; } /* OK, they are all OK, now go through again and actually send */ count = 0; for (i = 1; i < argc; i++) { if ((s = GETSEND(argv[i])) == 0) { fprintf(stderr, "Telnet 'send' error - argument disappeared!\r\n"); quit(); /*NOTREACHED*/ } if (s->handler) { count++; success += (*s->handler)((s->narg > 0) ? argv[i+1] : 0, (s->narg > 1) ? argv[i+2] : 0); i += s->narg; } else { NET2ADD(IAC, s->what); printoption("SENT", IAC, s->what); } } return (count == success); } static int send_tncmd(void (*func)(), char *cmd, char *name); static int send_esc() { NETADD(escape); return 1; } static int send_docmd(char *name) { return(send_tncmd(send_do, "do", name)); } static int send_dontcmd(char *name) { return(send_tncmd(send_dont, "dont", name)); } static int send_willcmd(char *name) { return(send_tncmd(send_will, "will", name)); } static int send_wontcmd(char *name) { return(send_tncmd(send_wont, "wont", name)); } extern char *telopts[]; /* XXX */ static int send_tncmd(void (*func)(), char *cmd, char *name) { char **cpp; int val = 0; if (isprefix(name, "help") || isprefix(name, "?")) { int col, len; printf("Usage: send %s \r\n", cmd); printf("\"value\" must be from 0 to 255\r\n"); printf("Valid options are:\r\n\t"); col = 8; for (cpp = telopts; *cpp; cpp++) { len = strlen(*cpp) + 3; if (col + len > 65) { printf("\r\n\t"); col = 8; } printf(" \"%s\"", *cpp); col += len; } printf("\r\n"); return 0; } cpp = genget(name, telopts, sizeof(char *)); if (Ambiguous(cpp)) { fprintf(stderr,"'%s': ambiguous argument ('send %s ?' for help).\r\n", name, cmd); return 0; } if (cpp) { val = cpp - telopts; } else { char *cp = name; while (*cp >= '0' && *cp <= '9') { val *= 10; val += *cp - '0'; cp++; } if (*cp != 0) { fprintf(stderr, "'%s': unknown argument ('send %s ?' for help).\r\n", name, cmd); return 0; } else if (val < 0 || val > 255) { fprintf(stderr, "'%s': bad value ('send %s ?' for help).\r\n", name, cmd); return 0; } } if (!connected) { printf("?Need to be connected first.\r\n"); return 0; } (*func)(val, 1); return 1; } static int send_help() { struct sendlist *s; /* pointer to current command */ for (s = Sendlist; s->name; s++) { if (s->help) printf("%-15s %s\r\n", s->name, s->help); } return(0); } /* * The following are the routines and data structures referred * to by the arguments to the "toggle" command. */ static int lclchars() { donelclchars = 1; return 1; } static int togdebug() { #ifndef NOT43 if (net > 0 && (SetSockOpt(net, SOL_SOCKET, SO_DEBUG, debug)) < 0) { perror("setsockopt (SO_DEBUG)"); } #else /* NOT43 */ if (debug) { if (net > 0 && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 0, 0) < 0) perror("setsockopt (SO_DEBUG)"); } else printf("Cannot turn off socket debugging\r\n"); #endif /* NOT43 */ return 1; } static int togcrlf() { if (crlf) { printf("Will send carriage returns as telnet .\r\n"); } else { printf("Will send carriage returns as telnet .\r\n"); } return 1; } int binmode; static int togbinary(int val) { donebinarytoggle = 1; if (val >= 0) { binmode = val; } else { if (my_want_state_is_will(TELOPT_BINARY) && my_want_state_is_do(TELOPT_BINARY)) { binmode = 1; } else if (my_want_state_is_wont(TELOPT_BINARY) && my_want_state_is_dont(TELOPT_BINARY)) { binmode = 0; } val = binmode ? 0 : 1; } if (val == 1) { if (my_want_state_is_will(TELOPT_BINARY) && my_want_state_is_do(TELOPT_BINARY)) { printf("Already operating in binary mode with remote host.\r\n"); } else { printf("Negotiating binary mode with remote host.\r\n"); tel_enter_binary(3); } } else { if (my_want_state_is_wont(TELOPT_BINARY) && my_want_state_is_dont(TELOPT_BINARY)) { printf("Already in network ascii mode with remote host.\r\n"); } else { printf("Negotiating network ascii mode with remote host.\r\n"); tel_leave_binary(3); } } return 1; } static int togrbinary(int val) { donebinarytoggle = 1; if (val == -1) val = my_want_state_is_do(TELOPT_BINARY) ? 0 : 1; if (val == 1) { if (my_want_state_is_do(TELOPT_BINARY)) { printf("Already receiving in binary mode.\r\n"); } else { printf("Negotiating binary mode on input.\r\n"); tel_enter_binary(1); } } else { if (my_want_state_is_dont(TELOPT_BINARY)) { printf("Already receiving in network ascii mode.\r\n"); } else { printf("Negotiating network ascii mode on input.\r\n"); tel_leave_binary(1); } } return 1; } static int togxbinary(int val) { donebinarytoggle = 1; if (val == -1) val = my_want_state_is_will(TELOPT_BINARY) ? 0 : 1; if (val == 1) { if (my_want_state_is_will(TELOPT_BINARY)) { printf("Already transmitting in binary mode.\r\n"); } else { printf("Negotiating binary mode on output.\r\n"); tel_enter_binary(2); } } else { if (my_want_state_is_wont(TELOPT_BINARY)) { printf("Already transmitting in network ascii mode.\r\n"); } else { printf("Negotiating network ascii mode on output.\r\n"); tel_leave_binary(2); } } return 1; } static int togglehelp (void); #if defined(AUTHENTICATION) extern int auth_togdebug (int); #endif #if defined(ENCRYPTION) extern int EncryptAutoEnc (int); extern int EncryptAutoDec (int); extern int EncryptDebug (int); extern int EncryptVerbose (int); #endif struct togglelist { char *name; /* name of toggle */ char *help; /* help message */ int (*handler)(); /* routine to do actual setting */ int *variable; char *actionexplanation; }; static struct togglelist Togglelist[] = { { "autoflush", "flushing of output when sending interrupt characters", 0, &autoflush, "flush output when sending interrupt characters" }, { "autosynch", "automatic sending of interrupt characters in urgent mode", 0, &autosynch, "send interrupt characters in urgent mode" }, #if defined(AUTHENTICATION) { "autologin", "automatic sending of login and/or authentication info", 0, &autologin, "send login name and/or authentication information" }, { "authdebug", "authentication debugging", auth_togdebug, 0, "print authentication debugging information" }, #endif #if defined(ENCRYPTION) { "autoencrypt", "automatic encryption of data stream", EncryptAutoEnc, 0, "automatically encrypt output" }, { "autodecrypt", "automatic decryption of data stream", EncryptAutoDec, 0, "automatically decrypt input" }, { "verbose_encrypt", "verbose encryption output", EncryptVerbose, 0, "print verbose encryption output" }, { "encdebug", "encryption debugging", EncryptDebug, 0, "print encryption debugging information" }, #endif #if defined(KRB5) { "forward", "credentials forwarding", kerberos5_set_forward, 0, "forward credentials" }, { "forwardable", "forwardable flag of forwarded credentials", kerberos5_set_forwardable, 0, "forward forwardable credentials" }, #endif { "skiprc", "don't read ~/.telnetrc file", 0, &skiprc, "skip reading of ~/.telnetrc file" }, { "binary", "sending and receiving of binary data", togbinary, 0, 0 }, { "inbinary", "receiving of binary data", togrbinary, 0, 0 }, { "outbinary", "sending of binary data", togxbinary, 0, 0 }, { "crlf", "sending carriage returns as telnet ", togcrlf, &crlf, 0 }, { "crmod", "mapping of received carriage returns", 0, &crmod, "map carriage return on output" }, { "localchars", "local recognition of certain control characters", lclchars, &localchars, "recognize certain control characters" }, { " ", "", 0 }, /* empty line */ { "debug", "debugging", togdebug, &debug, "turn on socket level debugging" }, { "netdata", "printing of hexadecimal network data (debugging)", 0, &netdata, "print hexadecimal representation of network traffic" }, { "prettydump", "output of \"netdata\" to user readable format (debugging)", 0, &prettydump, "print user readable output for \"netdata\"" }, { "options", "viewing of options processing (debugging)", 0, &showoptions, "show option processing" }, { "termdata", "printing of hexadecimal terminal data (debugging)", 0, &termdata, "print hexadecimal representation of terminal traffic" }, { "?", 0, togglehelp }, { "help", 0, togglehelp }, { 0 } }; static int togglehelp() { struct togglelist *c; for (c = Togglelist; c->name; c++) { if (c->help) { if (*c->help) printf("%-15s toggle %s\r\n", c->name, c->help); else printf("\r\n"); } } printf("\r\n"); printf("%-15s %s\r\n", "?", "display help information"); return 0; } static void settogglehelp(int set) { struct togglelist *c; for (c = Togglelist; c->name; c++) { if (c->help) { if (*c->help) printf("%-15s %s %s\r\n", c->name, set ? "enable" : "disable", c->help); else printf("\r\n"); } } } #define GETTOGGLE(name) (struct togglelist *) \ genget(name, (char **) Togglelist, sizeof(struct togglelist)) static int toggle(int argc, char *argv[]) { int retval = 1; char *name; struct togglelist *c; if (argc < 2) { fprintf(stderr, "Need an argument to 'toggle' command. 'toggle ?' for help.\r\n"); return 0; } argc--; argv++; while (argc--) { name = *argv++; c = GETTOGGLE(name); if (Ambiguous(c)) { fprintf(stderr, "'%s': ambiguous argument ('toggle ?' for help).\r\n", name); return 0; } else if (c == 0) { fprintf(stderr, "'%s': unknown argument ('toggle ?' for help).\r\n", name); return 0; } else { if (c->variable) { *c->variable = !*c->variable; /* invert it */ if (c->actionexplanation) { printf("%s %s.\r\n", *c->variable? "Will" : "Won't", c->actionexplanation); } } if (c->handler) { retval &= (*c->handler)(-1); } } } return retval; } /* * The following perform the "set" command. */ struct termios new_tc = { 0 }; struct setlist { char *name; /* name */ char *help; /* help information */ void (*handler)(); cc_t *charp; /* where it is located at */ }; static struct setlist Setlist[] = { #ifdef KLUDGELINEMODE { "echo", "character to toggle local echoing on/off", 0, &echoc }, #endif { "escape", "character to escape back to telnet command mode", 0, &escape }, { "rlogin", "rlogin escape character", 0, &rlogin }, { "tracefile", "file to write trace information to", SetNetTrace, (cc_t *)NetTraceFile}, { " ", "" }, { " ", "The following need 'localchars' to be toggled true", 0, 0 }, { "flushoutput", "character to cause an Abort Output", 0, &termFlushChar }, { "interrupt", "character to cause an Interrupt Process", 0, &termIntChar }, { "quit", "character to cause an Abort process", 0, &termQuitChar }, { "eof", "character to cause an EOF ", 0, &termEofChar }, { " ", "" }, { " ", "The following are for local editing in linemode", 0, 0 }, { "erase", "character to use to erase a character", 0, &termEraseChar }, { "kill", "character to use to erase a line", 0, &termKillChar }, { "lnext", "character to use for literal next", 0, &termLiteralNextChar }, { "susp", "character to cause a Suspend Process", 0, &termSuspChar }, { "reprint", "character to use for line reprint", 0, &termRprntChar }, { "worderase", "character to use to erase a word", 0, &termWerasChar }, { "start", "character to use for XON", 0, &termStartChar }, { "stop", "character to use for XOFF", 0, &termStopChar }, { "forw1", "alternate end of line character", 0, &termForw1Char }, { "forw2", "alternate end of line character", 0, &termForw2Char }, { "ayt", "alternate AYT character", 0, &termAytChar }, { 0 } }; static struct setlist * getset(char *name) { return (struct setlist *) genget(name, (char **) Setlist, sizeof(struct setlist)); } void set_escape_char(char *s) { if (rlogin != _POSIX_VDISABLE) { rlogin = (s && *s) ? special(s) : _POSIX_VDISABLE; printf("Telnet rlogin escape character is '%s'.\r\n", control(rlogin)); } else { escape = (s && *s) ? special(s) : _POSIX_VDISABLE; printf("Telnet escape character is '%s'.\r\n", control(escape)); } } static int setcmd(int argc, char *argv[]) { int value; struct setlist *ct; struct togglelist *c; if (argc < 2 || argc > 3) { printf("Format is 'set Name Value'\r\n'set ?' for help.\r\n"); return 0; } if ((argc == 2) && (isprefix(argv[1], "?") || isprefix(argv[1], "help"))) { for (ct = Setlist; ct->name; ct++) printf("%-15s %s\r\n", ct->name, ct->help); printf("\r\n"); settogglehelp(1); printf("%-15s %s\r\n", "?", "display help information"); return 0; } ct = getset(argv[1]); if (ct == 0) { c = GETTOGGLE(argv[1]); if (c == 0) { fprintf(stderr, "'%s': unknown argument ('set ?' for help).\r\n", argv[1]); return 0; } else if (Ambiguous(c)) { fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\r\n", argv[1]); return 0; } if (c->variable) { if ((argc == 2) || (strcmp("on", argv[2]) == 0)) *c->variable = 1; else if (strcmp("off", argv[2]) == 0) *c->variable = 0; else { printf("Format is 'set togglename [on|off]'\r\n'set ?' for help.\r\n"); return 0; } if (c->actionexplanation) { printf("%s %s.\r\n", *c->variable? "Will" : "Won't", c->actionexplanation); } } if (c->handler) (*c->handler)(1); } else if (argc != 3) { printf("Format is 'set Name Value'\r\n'set ?' for help.\r\n"); return 0; } else if (Ambiguous(ct)) { fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\r\n", argv[1]); return 0; } else if (ct->handler) { (*ct->handler)(argv[2]); printf("%s set to \"%s\".\r\n", ct->name, (char *)ct->charp); } else { if (strcmp("off", argv[2])) { value = special(argv[2]); } else { value = _POSIX_VDISABLE; } *(ct->charp) = (cc_t)value; printf("%s character is '%s'.\r\n", ct->name, control(*(ct->charp))); } slc_check(); return 1; } static int unsetcmd(int argc, char *argv[]) { struct setlist *ct; struct togglelist *c; char *name; if (argc < 2) { fprintf(stderr, "Need an argument to 'unset' command. 'unset ?' for help.\r\n"); return 0; } if (isprefix(argv[1], "?") || isprefix(argv[1], "help")) { for (ct = Setlist; ct->name; ct++) printf("%-15s %s\r\n", ct->name, ct->help); printf("\r\n"); settogglehelp(0); printf("%-15s %s\r\n", "?", "display help information"); return 0; } argc--; argv++; while (argc--) { name = *argv++; ct = getset(name); if (ct == 0) { c = GETTOGGLE(name); if (c == 0) { fprintf(stderr, "'%s': unknown argument ('unset ?' for help).\r\n", name); return 0; } else if (Ambiguous(c)) { fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\r\n", name); return 0; } if (c->variable) { *c->variable = 0; if (c->actionexplanation) { printf("%s %s.\r\n", *c->variable? "Will" : "Won't", c->actionexplanation); } } if (c->handler) (*c->handler)(0); } else if (Ambiguous(ct)) { fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\r\n", name); return 0; } else if (ct->handler) { (*ct->handler)(0); printf("%s reset to \"%s\".\r\n", ct->name, (char *)ct->charp); } else { *(ct->charp) = _POSIX_VDISABLE; printf("%s character is '%s'.\r\n", ct->name, control(*(ct->charp))); } } return 1; } /* * The following are the data structures and routines for the * 'mode' command. */ #ifdef KLUDGELINEMODE static int dokludgemode(void) { kludgelinemode = 1; send_wont(TELOPT_LINEMODE, 1); send_dont(TELOPT_SGA, 1); send_dont(TELOPT_ECHO, 1); return 1; } #endif static int dolinemode() { #ifdef KLUDGELINEMODE if (kludgelinemode) send_dont(TELOPT_SGA, 1); #endif send_will(TELOPT_LINEMODE, 1); send_dont(TELOPT_ECHO, 1); return 1; } static int docharmode() { #ifdef KLUDGELINEMODE if (kludgelinemode) send_do(TELOPT_SGA, 1); else #endif send_wont(TELOPT_LINEMODE, 1); send_do(TELOPT_ECHO, 1); return 1; } static int dolmmode(int bit, int on) { unsigned char c; if (my_want_state_is_wont(TELOPT_LINEMODE)) { printf("?Need to have LINEMODE option enabled first.\r\n"); printf("'mode ?' for help.\r\n"); return 0; } if (on) c = (linemode | bit); else c = (linemode & ~bit); lm_mode(&c, 1, 1); return 1; } static int tn_setmode(int bit) { return dolmmode(bit, 1); } static int tn_clearmode(int bit) { return dolmmode(bit, 0); } struct modelist { char *name; /* command name */ char *help; /* help string */ int (*handler)(); /* routine which executes command */ int needconnect; /* Do we need to be connected to execute? */ int arg1; }; static int modehelp(void); static struct modelist ModeList[] = { { "character", "Disable LINEMODE option", docharmode, 1 }, #ifdef KLUDGELINEMODE { "", "(or disable obsolete line-by-line mode)", 0 }, #endif { "line", "Enable LINEMODE option", dolinemode, 1 }, #ifdef KLUDGELINEMODE { "", "(or enable obsolete line-by-line mode)", 0 }, #endif { "", "", 0 }, { "", "These require the LINEMODE option to be enabled", 0 }, { "isig", "Enable signal trapping", tn_setmode, 1, MODE_TRAPSIG }, { "+isig", 0, tn_setmode, 1, MODE_TRAPSIG }, { "-isig", "Disable signal trapping", tn_clearmode, 1, MODE_TRAPSIG }, { "edit", "Enable character editing", tn_setmode, 1, MODE_EDIT }, { "+edit", 0, tn_setmode, 1, MODE_EDIT }, { "-edit", "Disable character editing", tn_clearmode, 1, MODE_EDIT }, { "softtabs", "Enable tab expansion", tn_setmode, 1, MODE_SOFT_TAB }, { "+softtabs", 0, tn_setmode, 1, MODE_SOFT_TAB }, { "-softtabs", "Disable tab expansion", tn_clearmode, 1, MODE_SOFT_TAB }, { "litecho", "Enable literal character echo", tn_setmode, 1, MODE_LIT_ECHO }, { "+litecho", 0, tn_setmode, 1, MODE_LIT_ECHO }, { "-litecho", "Disable literal character echo", tn_clearmode, 1, MODE_LIT_ECHO }, { "help", 0, modehelp, 0 }, #ifdef KLUDGELINEMODE { "kludgeline", 0, dokludgemode, 1 }, #endif { "", "", 0 }, { "?", "Print help information", modehelp, 0 }, { 0 }, }; static int modehelp(void) { struct modelist *mt; printf("format is: 'mode Mode', where 'Mode' is one of:\r\n\r\n"); for (mt = ModeList; mt->name; mt++) { if (mt->help) { if (*mt->help) printf("%-15s %s\r\n", mt->name, mt->help); else printf("\r\n"); } } return 0; } #define GETMODECMD(name) (struct modelist *) \ genget(name, (char **) ModeList, sizeof(struct modelist)) static int modecmd(int argc, char **argv) { struct modelist *mt; if (argc != 2) { printf("'mode' command requires an argument\r\n"); printf("'mode ?' for help.\r\n"); } else if ((mt = GETMODECMD(argv[1])) == 0) { fprintf(stderr, "Unknown mode '%s' ('mode ?' for help).\r\n", argv[1]); } else if (Ambiguous(mt)) { fprintf(stderr, "Ambiguous mode '%s' ('mode ?' for help).\r\n", argv[1]); } else if (mt->needconnect && !connected) { printf("?Need to be connected first.\r\n"); printf("'mode ?' for help.\r\n"); } else if (mt->handler) { return (*mt->handler)(mt->arg1); } return 0; } /* * The following data structures and routines implement the * "display" command. */ static int display(int argc, char *argv[]) { struct togglelist *tl; struct setlist *sl; #define dotog(tl) if (tl->variable && tl->actionexplanation) { \ if (*tl->variable) { \ printf("will"); \ } else { \ printf("won't"); \ } \ printf(" %s.\r\n", tl->actionexplanation); \ } #define doset(sl) if (sl->name && *sl->name != ' ') { \ if (sl->handler == 0) \ printf("%-15s [%s]\r\n", sl->name, control(*sl->charp)); \ else \ printf("%-15s \"%s\"\r\n", sl->name, (char *)sl->charp); \ } if (argc == 1) { for (tl = Togglelist; tl->name; tl++) { dotog(tl); } printf("\r\n"); for (sl = Setlist; sl->name; sl++) { doset(sl); } } else { int i; for (i = 1; i < argc; i++) { sl = getset(argv[i]); tl = GETTOGGLE(argv[i]); if (Ambiguous(sl) || Ambiguous(tl)) { printf("?Ambiguous argument '%s'.\r\n", argv[i]); return 0; } else if (!sl && !tl) { printf("?Unknown argument '%s'.\r\n", argv[i]); return 0; } else { if (tl) { dotog(tl); } if (sl) { doset(sl); } } } } /*@*/optionstatus(); #if defined(ENCRYPTION) EncryptStatus(); #endif return 1; #undef doset #undef dotog } /* * The following are the data structures, and many of the routines, * relating to command processing. */ /* * Set the escape character. */ static int setescape(int argc, char *argv[]) { char *arg; char buf[50]; printf( "Deprecated usage - please use 'set escape%s%s' in the future.\r\n", (argc > 2)? " ":"", (argc > 2)? argv[1]: ""); if (argc > 2) arg = argv[1]; else { printf("new escape character: "); fgets(buf, sizeof(buf), stdin); arg = buf; } if (arg[0] != '\0') escape = arg[0]; printf("Escape character is '%s'.\r\n", control(escape)); fflush(stdout); return 1; } static int togcrmod() { crmod = !crmod; printf("Deprecated usage - please use 'toggle crmod' in the future.\r\n"); printf("%s map carriage return on output.\r\n", crmod ? "Will" : "Won't"); fflush(stdout); return 1; } static int telnetsuspend() { #ifdef SIGTSTP setcommandmode(); { long oldrows, oldcols, newrows, newcols, err; err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0; kill(0, SIGTSTP); /* * If we didn't get the window size before the SUSPEND, but we * can get them now (?), then send the NAWS to make sure that * we are set up for the right window size. */ if (TerminalWindowSize(&newrows, &newcols) && connected && (err || ((oldrows != newrows) || (oldcols != newcols)))) { sendnaws(); } } /* reget parameters in case they were changed */ TerminalSaveState(); setconnmode(0); #else printf("Suspend is not supported. Try the '!' command instead\r\n"); #endif return 1; } static int shell(int argc, char **argv) { long oldrows, oldcols, newrows, newcols, err; setcommandmode(); err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0; switch(fork()) { case -1: perror("Fork failed\r\n"); break; case 0: { /* * Fire up the shell in the child. */ char *shellp, *shellname; shellp = getenv("SHELL"); if (shellp == NULL) shellp = "/bin/sh"; if ((shellname = strrchr(shellp, '/')) == 0) shellname = shellp; else shellname++; if (argc > 1) execl(shellp, shellname, "-c", &saveline[1], NULL); else execl(shellp, shellname, NULL); perror("Execl"); _exit(1); } default: wait((int *)0); /* Wait for the shell to complete */ if (TerminalWindowSize(&newrows, &newcols) && connected && (err || ((oldrows != newrows) || (oldcols != newcols)))) { sendnaws(); } break; } return 1; } static int bye(int argc, char **argv) { if (connected) { shutdown(net, 2); printf("Connection closed.\r\n"); NetClose(net); connected = 0; resettermname = 1; #if defined(AUTHENTICATION) || defined(ENCRYPTION) auth_encrypt_connect(connected); #endif /* reset options */ tninit(); } if ((argc != 2) || (strcmp(argv[1], "fromquit") != 0)) longjmp(toplevel, 1); return 0; /* NOTREACHED */ } int quit(void) { call(bye, "bye", "fromquit", 0); Exit(0); return 0; /*NOTREACHED*/ } static int logout() { send_do(TELOPT_LOGOUT, 1); netflush(); return 1; } /* * The SLC command. */ struct slclist { char *name; char *help; void (*handler)(); int arg; }; static void slc_help(void); struct slclist SlcList[] = { { "export", "Use local special character definitions", slc_mode_export, 0 }, { "import", "Use remote special character definitions", slc_mode_import, 1 }, { "check", "Verify remote special character definitions", slc_mode_import, 0 }, { "help", 0, slc_help, 0 }, { "?", "Print help information", slc_help, 0 }, { 0 }, }; static void slc_help(void) { struct slclist *c; for (c = SlcList; c->name; c++) { if (c->help) { if (*c->help) printf("%-15s %s\r\n", c->name, c->help); else printf("\r\n"); } } } static struct slclist * getslc(char *name) { return (struct slclist *) genget(name, (char **) SlcList, sizeof(struct slclist)); } static int slccmd(int argc, char **argv) { struct slclist *c; if (argc != 2) { fprintf(stderr, "Need an argument to 'slc' command. 'slc ?' for help.\r\n"); return 0; } c = getslc(argv[1]); if (c == 0) { fprintf(stderr, "'%s': unknown argument ('slc ?' for help).\r\n", argv[1]); return 0; } if (Ambiguous(c)) { fprintf(stderr, "'%s': ambiguous argument ('slc ?' for help).\r\n", argv[1]); return 0; } (*c->handler)(c->arg); slcstate(); return 1; } /* * The ENVIRON command. */ struct envlist { char *name; char *help; void (*handler)(); int narg; }; static void env_help (void); struct envlist EnvList[] = { { "define", "Define an environment variable", (void (*)())env_define, 2 }, { "undefine", "Undefine an environment variable", env_undefine, 1 }, { "export", "Mark an environment variable for automatic export", env_export, 1 }, { "unexport", "Don't mark an environment variable for automatic export", env_unexport, 1 }, { "send", "Send an environment variable", env_send, 1 }, { "list", "List the current environment variables", env_list, 0 }, { "help", 0, env_help, 0 }, { "?", "Print help information", env_help, 0 }, { 0 }, }; static void env_help() { struct envlist *c; for (c = EnvList; c->name; c++) { if (c->help) { if (*c->help) printf("%-15s %s\r\n", c->name, c->help); else printf("\r\n"); } } } static struct envlist * getenvcmd(char *name) { return (struct envlist *) genget(name, (char **) EnvList, sizeof(struct envlist)); } static int env_cmd(int argc, char **argv) { struct envlist *c; if (argc < 2) { fprintf(stderr, "Need an argument to 'environ' command. 'environ ?' for help.\r\n"); return 0; } c = getenvcmd(argv[1]); if (c == 0) { fprintf(stderr, "'%s': unknown argument ('environ ?' for help).\r\n", argv[1]); return 0; } if (Ambiguous(c)) { fprintf(stderr, "'%s': ambiguous argument ('environ ?' for help).\r\n", argv[1]); return 0; } if (c->narg + 2 != argc) { fprintf(stderr, "Need %s%d argument%s to 'environ %s' command. 'environ ?' for help.\r\n", c->narg < argc + 2 ? "only " : "", c->narg, c->narg == 1 ? "" : "s", c->name); return 0; } (*c->handler)(argv[2], argv[3]); return 1; } struct env_lst { struct env_lst *next; /* pointer to next structure */ struct env_lst *prev; /* pointer to previous structure */ unsigned char *var; /* pointer to variable name */ unsigned char *value; /* pointer to variable value */ int export; /* 1 -> export with default list of variables */ int welldefined; /* A well defined variable */ }; struct env_lst envlisthead; struct env_lst * env_find(unsigned char *var) { struct env_lst *ep; for (ep = envlisthead.next; ep; ep = ep->next) { if (strcmp((char *)ep->var, (char *)var) == 0) return(ep); } return(NULL); } #if !HAVE_DECL_ENVIRON extern char **environ; #endif void env_init(void) { char **epp, *cp; struct env_lst *ep; for (epp = environ; *epp; epp++) { if ((cp = strchr(*epp, '='))) { *cp = '\0'; ep = env_define((unsigned char *)*epp, (unsigned char *)cp+1); ep->export = 0; *cp = '='; } } /* * Special case for DISPLAY variable. If it is ":0.0" or * "unix:0.0", we have to get rid of "unix" and insert our * hostname. */ if ((ep = env_find((unsigned char*)"DISPLAY")) && (*ep->value == ':' || strncmp((char *)ep->value, "unix:", 5) == 0)) { char hbuf[256+1]; char *cp2 = strchr((char *)ep->value, ':'); int error; /* XXX - should be k_gethostname? */ gethostname(hbuf, 256); hbuf[256] = '\0'; /* If this is not the full name, try to get it via DNS */ if (strchr(hbuf, '.') == 0) { struct addrinfo hints, *ai, *a; memset (&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; error = getaddrinfo (hbuf, NULL, &hints, &ai); if (error == 0) { for (a = ai; a != NULL; a = a->ai_next) if (a->ai_canonname != NULL) { strlcpy (hbuf, ai->ai_canonname, 256); break; } freeaddrinfo (ai); } } error = asprintf (&cp, "%s%s", hbuf, cp2); if (error != -1) { free (ep->value); ep->value = (unsigned char *)cp; } } /* * If USER is not defined, but LOGNAME is, then add * USER with the value from LOGNAME. By default, we * don't export the USER variable. */ if ((env_find((unsigned char*)"USER") == NULL) && (ep = env_find((unsigned char*)"LOGNAME"))) { env_define((unsigned char *)"USER", ep->value); env_unexport((unsigned char *)"USER"); } env_export((unsigned char *)"DISPLAY"); env_export((unsigned char *)"PRINTER"); env_export((unsigned char *)"XAUTHORITY"); } struct env_lst * env_define(unsigned char *var, unsigned char *value) { struct env_lst *ep; if ((ep = env_find(var))) { if (ep->var) free(ep->var); if (ep->value) free(ep->value); } else { ep = (struct env_lst *)malloc(sizeof(struct env_lst)); ep->next = envlisthead.next; envlisthead.next = ep; ep->prev = &envlisthead; if (ep->next) ep->next->prev = ep; } ep->welldefined = opt_welldefined((char *)var); ep->export = 1; ep->var = (unsigned char *)strdup((char *)var); ep->value = (unsigned char *)strdup((char *)value); return(ep); } void env_undefine(unsigned char *var) { struct env_lst *ep; if ((ep = env_find(var))) { ep->prev->next = ep->next; if (ep->next) ep->next->prev = ep->prev; if (ep->var) free(ep->var); if (ep->value) free(ep->value); free(ep); } } void env_export(unsigned char *var) { struct env_lst *ep; if ((ep = env_find(var))) ep->export = 1; } void env_unexport(unsigned char *var) { struct env_lst *ep; if ((ep = env_find(var))) ep->export = 0; } void env_send(unsigned char *var) { struct env_lst *ep; if (my_state_is_wont(TELOPT_NEW_ENVIRON) #ifdef OLD_ENVIRON && my_state_is_wont(TELOPT_OLD_ENVIRON) #endif ) { fprintf(stderr, "Cannot send '%s': Telnet ENVIRON option not enabled\r\n", var); return; } ep = env_find(var); if (ep == 0) { fprintf(stderr, "Cannot send '%s': variable not defined\r\n", var); return; } env_opt_start_info(); env_opt_add(ep->var); env_opt_end(0); } void env_list(void) { struct env_lst *ep; for (ep = envlisthead.next; ep; ep = ep->next) { printf("%c %-20s %s\r\n", ep->export ? '*' : ' ', ep->var, ep->value); } } unsigned char * env_default(int init, int welldefined) { static struct env_lst *nep = NULL; if (init) { nep = &envlisthead; return NULL; } if (nep) { while ((nep = nep->next)) { if (nep->export && (nep->welldefined == welldefined)) return(nep->var); } } return(NULL); } unsigned char * env_getvalue(unsigned char *var) { struct env_lst *ep; if ((ep = env_find(var))) return(ep->value); return(NULL); } #if defined(AUTHENTICATION) /* * The AUTHENTICATE command. */ struct authlist { char *name; char *help; int (*handler)(); int narg; }; static int auth_help (void); struct authlist AuthList[] = { { "status", "Display current status of authentication information", auth_status, 0 }, { "disable", "Disable an authentication type ('auth disable ?' for more)", auth_disable, 1 }, { "enable", "Enable an authentication type ('auth enable ?' for more)", auth_enable, 1 }, { "help", 0, auth_help, 0 }, { "?", "Print help information", auth_help, 0 }, { 0 }, }; static int auth_help() { struct authlist *c; for (c = AuthList; c->name; c++) { if (c->help) { if (*c->help) printf("%-15s %s\r\n", c->name, c->help); else printf("\r\n"); } } return 0; } static int auth_cmd(int argc, char **argv) { struct authlist *c; if (argc < 2) { fprintf(stderr, "Need an argument to 'auth' command. 'auth ?' for help.\r\n"); return 0; } c = (struct authlist *) genget(argv[1], (char **) AuthList, sizeof(struct authlist)); if (c == 0) { fprintf(stderr, "'%s': unknown argument ('auth ?' for help).\r\n", argv[1]); return 0; } if (Ambiguous(c)) { fprintf(stderr, "'%s': ambiguous argument ('auth ?' for help).\r\n", argv[1]); return 0; } if (c->narg + 2 != argc) { fprintf(stderr, "Need %s%d argument%s to 'auth %s' command. 'auth ?' for help.\r\n", c->narg < argc + 2 ? "only " : "", c->narg, c->narg == 1 ? "" : "s", c->name); return 0; } return((*c->handler)(argv[2], argv[3])); } #endif #if defined(ENCRYPTION) /* * The ENCRYPT command. */ struct encryptlist { char *name; char *help; int (*handler)(); int needconnect; int minarg; int maxarg; }; static int EncryptHelp (void); struct encryptlist EncryptList[] = { { "enable", "Enable encryption. ('encrypt enable ?' for more)", EncryptEnable, 1, 1, 2 }, { "disable", "Disable encryption. ('encrypt enable ?' for more)", EncryptDisable, 0, 1, 2 }, { "type", "Set encryptiong type. ('encrypt type ?' for more)", EncryptType, 0, 1, 1 }, { "start", "Start encryption. ('encrypt start ?' for more)", EncryptStart, 1, 0, 1 }, { "stop", "Stop encryption. ('encrypt stop ?' for more)", EncryptStop, 1, 0, 1 }, { "input", "Start encrypting the input stream", EncryptStartInput, 1, 0, 0 }, { "-input", "Stop encrypting the input stream", EncryptStopInput, 1, 0, 0 }, { "output", "Start encrypting the output stream", EncryptStartOutput, 1, 0, 0 }, { "-output", "Stop encrypting the output stream", EncryptStopOutput, 1, 0, 0 }, { "status", "Display current status of authentication information", EncryptStatus, 0, 0, 0 }, { "help", 0, EncryptHelp, 0, 0, 0 }, { "?", "Print help information", EncryptHelp, 0, 0, 0 }, { 0 }, }; static int EncryptHelp() { struct encryptlist *c; for (c = EncryptList; c->name; c++) { if (c->help) { if (*c->help) printf("%-15s %s\r\n", c->name, c->help); else printf("\r\n"); } } return 0; } static int encrypt_cmd(int argc, char **argv) { struct encryptlist *c; c = (struct encryptlist *) genget(argv[1], (char **) EncryptList, sizeof(struct encryptlist)); if (c == 0) { fprintf(stderr, "'%s': unknown argument ('encrypt ?' for help).\r\n", argv[1]); return 0; } if (Ambiguous(c)) { fprintf(stderr, "'%s': ambiguous argument ('encrypt ?' for help).\r\n", argv[1]); return 0; } argc -= 2; if (argc < c->minarg || argc > c->maxarg) { if (c->minarg == c->maxarg) { fprintf(stderr, "Need %s%d argument%s ", c->minarg < argc ? "only " : "", c->minarg, c->minarg == 1 ? "" : "s"); } else { fprintf(stderr, "Need %s%d-%d arguments ", c->maxarg < argc ? "only " : "", c->minarg, c->maxarg); } fprintf(stderr, "to 'encrypt %s' command. 'encrypt ?' for help.\r\n", c->name); return 0; } if (c->needconnect && !connected) { if (!(argc && (isprefix(argv[2], "help") || isprefix(argv[2], "?")))) { printf("?Need to be connected first.\r\n"); return 0; } } return ((*c->handler)(argc > 0 ? argv[2] : 0, argc > 1 ? argv[3] : 0, argc > 2 ? argv[4] : 0)); } #endif /* * Print status about the connection. */ static int status(int argc, char **argv) { if (connected) { printf("Connected to %s.\r\n", hostname); if ((argc < 2) || strcmp(argv[1], "notmuch")) { int mode = getconnmode(); if (my_want_state_is_will(TELOPT_LINEMODE)) { printf("Operating with LINEMODE option\r\n"); printf("%s line editing\r\n", (mode&MODE_EDIT) ? "Local" : "No"); printf("%s catching of signals\r\n", (mode&MODE_TRAPSIG) ? "Local" : "No"); slcstate(); #ifdef KLUDGELINEMODE } else if (kludgelinemode && my_want_state_is_dont(TELOPT_SGA)) { printf("Operating in obsolete linemode\r\n"); #endif } else { printf("Operating in single character mode\r\n"); if (localchars) printf("Catching signals locally\r\n"); } printf("%s character echo\r\n", (mode&MODE_ECHO) ? "Local" : "Remote"); if (my_want_state_is_will(TELOPT_LFLOW)) printf("%s flow control\r\n", (mode&MODE_FLOW) ? "Local" : "No"); #if defined(ENCRYPTION) encrypt_display(); #endif } } else { printf("No connection.\r\n"); } printf("Escape character is '%s'.\r\n", control(escape)); fflush(stdout); return 1; } #ifdef SIGINFO /* * Function that gets called when SIGINFO is received. */ RETSIGTYPE ayt_status(int ignore) { call(status, "status", "notmuch", 0); } #endif static Command *getcmd(char *name); static void cmdrc(char *m1, char *m2) { static char rcname[128]; Command *c; FILE *rcfile; int gotmachine = 0; int l1 = strlen(m1); int l2 = strlen(m2); char m1save[64]; if (skiprc) return; strlcpy(m1save, m1, sizeof(m1save)); m1 = m1save; if (rcname[0] == 0) { char *home = getenv("HOME"); snprintf (rcname, sizeof(rcname), "%s/.telnetrc", home ? home : ""); } if ((rcfile = fopen(rcname, "r")) == 0) { return; } for (;;) { if (fgets(line, sizeof(line), rcfile) == NULL) break; if (line[0] == 0) break; if (line[0] == '#') continue; if (gotmachine) { if (!isspace((unsigned char)line[0])) gotmachine = 0; } if (gotmachine == 0) { if (isspace((unsigned char)line[0])) continue; if (strncasecmp(line, m1, l1) == 0) strncpy(line, &line[l1], sizeof(line) - l1); else if (strncasecmp(line, m2, l2) == 0) strncpy(line, &line[l2], sizeof(line) - l2); else if (strncasecmp(line, "DEFAULT", 7) == 0) strncpy(line, &line[7], sizeof(line) - 7); else continue; if (line[0] != ' ' && line[0] != '\t' && line[0] != '\n') continue; gotmachine = 1; } makeargv(); if (margv[0] == 0) continue; c = getcmd(margv[0]); if (Ambiguous(c)) { printf("?Ambiguous command: %s\r\n", margv[0]); continue; } if (c == 0) { printf("?Invalid command: %s\r\n", margv[0]); continue; } /* * This should never happen... */ if (c->needconnect && !connected) { printf("?Need to be connected first for %s.\r\n", margv[0]); continue; } (*c->handler)(margc, margv); } fclose(rcfile); } int tn(int argc, char **argv) { struct servent *sp = 0; char *cmd, *hostp = 0, *portp = 0; char *user = 0; int port = 0; /* clear the socket address prior to use */ if (connected) { printf("?Already connected to %s\r\n", hostname); return 0; } if (argc < 2) { strlcpy(line, "open ", sizeof(line)); printf("(to) "); fgets(&line[strlen(line)], sizeof(line) - strlen(line), stdin); makeargv(); argc = margc; argv = margv; } cmd = *argv; --argc; ++argv; while (argc) { if (strcmp(*argv, "help") == 0 || isprefix(*argv, "?")) goto usage; if (strcmp(*argv, "-l") == 0) { --argc; ++argv; if (argc == 0) goto usage; user = strdup(*argv++); --argc; continue; } if (strcmp(*argv, "-a") == 0) { --argc; ++argv; autologin = 1; continue; } if (hostp == 0) { hostp = *argv++; --argc; continue; } if (portp == 0) { portp = *argv++; --argc; continue; } usage: printf("usage: %s [-l user] [-a] host-name [port]\r\n", cmd); return 0; } if (hostp == 0) goto usage; strlcpy (_hostname, hostp, sizeof(_hostname)); hostp = _hostname; if (hostp[0] == '@' || hostp[0] == '!') { char *p; hostname = NULL; for (p = hostp + 1; *p; p++) { if (*p == ',' || *p == '@') hostname = p; } if (hostname == NULL) { fprintf(stderr, "%s: bad source route specification\n", hostp); return 0; } *hostname++ = '\0'; } else hostname = hostp; if (portp) { if (*portp == '-') { portp++; telnetport = 1; } else telnetport = 0; port = atoi(portp); if (port == 0) { sp = roken_getservbyname(portp, "tcp"); if (sp) port = sp->s_port; else { printf("%s: bad port number\r\n", portp); return 0; } } else { port = htons(port); } } else { if (sp == 0) { sp = roken_getservbyname("telnet", "tcp"); if (sp == 0) { fprintf(stderr, "telnet: tcp/telnet: unknown service\r\n"); return 0; } port = sp->s_port; } telnetport = 1; } { struct addrinfo *ai, *a, hints; int error; char portstr[NI_MAXSERV]; memset (&hints, 0, sizeof(hints)); hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = IPPROTO_TCP; hints.ai_flags = AI_CANONNAME; snprintf (portstr, sizeof(portstr), "%u", ntohs(port)); error = getaddrinfo (hostname, portstr, &hints, &ai); if (error) { fprintf (stderr, "%s: %s\r\n", hostname, gai_strerror (error)); return 0; } for (a = ai; a != NULL && connected == 0; a = a->ai_next) { char addrstr[256]; if (a->ai_canonname != NULL) strlcpy (_hostname, a->ai_canonname, sizeof(_hostname)); if (getnameinfo (a->ai_addr, a->ai_addrlen, addrstr, sizeof(addrstr), NULL, 0, NI_NUMERICHOST) != 0) strlcpy (addrstr, "unknown address", sizeof(addrstr)); printf("Trying %s...\r\n", addrstr); net = socket (a->ai_family, a->ai_socktype, a->ai_protocol); if (net < 0) { warn ("socket"); continue; } #if defined(IP_OPTIONS) && defined(IPPROTO_IP) && defined(HAVE_SETSOCKOPT) if (hostp[0] == '@' || hostp[0] == '!') { char *srp = 0; int srlen; int proto, opt; if ((srlen = sourceroute(a, hostp, &srp, &proto, &opt)) < 0) { (void) NetClose(net); net = -1; continue; } if (srp && setsockopt(net, proto, opt, srp, srlen) < 0) perror("setsockopt (source route)"); } #endif #if defined(IPPROTO_IP) && defined(IP_TOS) if (a->ai_family == AF_INET) { # if defined(HAVE_GETTOSBYNAME) struct tosent *tp; if (tos < 0 && (tp = gettosbyname("telnet", "tcp"))) tos = tp->t_tos; # endif if (tos < 0) tos = 020; /* Low Delay bit */ if (tos && (setsockopt(net, IPPROTO_IP, IP_TOS, (void *)&tos, sizeof(int)) < 0) && (errno != ENOPROTOOPT)) perror("telnet: setsockopt (IP_TOS) (ignored)"); } #endif /* defined(IPPROTO_IP) && defined(IP_TOS) */ if (debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) { perror("setsockopt (SO_DEBUG)"); } if (connect (net, a->ai_addr, a->ai_addrlen) < 0) { fprintf (stderr, "telnet: connect to address %s: %s\n", addrstr, strerror(errno)); NetClose(net); if (a->ai_next != NULL) { continue; } else { freeaddrinfo (ai); return 0; } } ++connected; #if defined(AUTHENTICATION) || defined(ENCRYPTION) auth_encrypt_connect(connected); #endif } freeaddrinfo (ai); if (connected == 0) return 0; } cmdrc(hostp, hostname); set_forward_options(); if (autologin && user == NULL) user = (char *)get_default_username (); if (user) { env_define((unsigned char *)"USER", (unsigned char *)user); env_export((unsigned char *)"USER"); } call(status, "status", "notmuch", 0); if (setjmp(peerdied) == 0) my_telnet((char *)user); NetClose(net); ExitString("Connection closed by foreign host.\r\n",1); /*NOTREACHED*/ return 0; } #define HELPINDENT ((int)sizeof ("connect")) static char openhelp[] = "connect to a site", closehelp[] = "close current connection", logouthelp[] = "forcibly logout remote user and close the connection", quithelp[] = "exit telnet", statushelp[] = "print status information", helphelp[] = "print help information", sendhelp[] = "transmit special characters ('send ?' for more)", sethelp[] = "set operating parameters ('set ?' for more)", unsethelp[] = "unset operating parameters ('unset ?' for more)", togglestring[] ="toggle operating parameters ('toggle ?' for more)", slchelp[] = "change state of special charaters ('slc ?' for more)", displayhelp[] = "display operating parameters", #if defined(AUTHENTICATION) authhelp[] = "turn on (off) authentication ('auth ?' for more)", #endif #if defined(ENCRYPTION) encrypthelp[] = "turn on (off) encryption ('encrypt ?' for more)", #endif zhelp[] = "suspend telnet", shellhelp[] = "invoke a subshell", envhelp[] = "change environment variables ('environ ?' for more)", modestring[] = "try to enter line or character mode ('mode ?' for more)"; static int help(int argc, char **argv); static Command cmdtab[] = { { "close", closehelp, bye, 1 }, { "logout", logouthelp, logout, 1 }, { "display", displayhelp, display, 0 }, { "mode", modestring, modecmd, 0 }, { "open", openhelp, tn, 0 }, { "quit", quithelp, quit, 0 }, { "send", sendhelp, sendcmd, 0 }, { "set", sethelp, setcmd, 0 }, { "unset", unsethelp, unsetcmd, 0 }, { "status", statushelp, status, 0 }, { "toggle", togglestring, toggle, 0 }, { "slc", slchelp, slccmd, 0 }, #if defined(AUTHENTICATION) { "auth", authhelp, auth_cmd, 0 }, #endif #if defined(ENCRYPTION) { "encrypt", encrypthelp, encrypt_cmd, 0 }, #endif { "z", zhelp, telnetsuspend, 0 }, { "!", shellhelp, shell, 0 }, { "environ", envhelp, env_cmd, 0 }, { "?", helphelp, help, 0 }, { 0, 0, 0, 0 } }; static char crmodhelp[] = "deprecated command -- use 'toggle crmod' instead"; static char escapehelp[] = "deprecated command -- use 'set escape' instead"; static Command cmdtab2[] = { { "help", 0, help, 0 }, { "escape", escapehelp, setescape, 0 }, { "crmod", crmodhelp, togcrmod, 0 }, { 0, 0, 0, 0 } }; /* * Call routine with argc, argv set from args (terminated by 0). */ static int call(intrtn_t routine, ...) { va_list ap; char *args[100]; int argno = 0; va_start(ap, routine); while ((args[argno++] = va_arg(ap, char *)) != 0); va_end(ap); return (*routine)(argno-1, args); } static Command *getcmd(char *name) { Command *cm; if ((cm = (Command *) genget(name, (char **) cmdtab, sizeof(Command)))) return cm; return (Command *) genget(name, (char **) cmdtab2, sizeof(Command)); } void command(int top, char *tbuf, int cnt) { Command *c; setcommandmode(); if (!top) { putchar('\n'); } else { signal(SIGINT, SIG_DFL); signal(SIGQUIT, SIG_DFL); } for (;;) { if (rlogin == _POSIX_VDISABLE) printf("%s> ", prompt); if (tbuf) { char *cp; cp = line; while (cnt > 0 && (*cp++ = *tbuf++) != '\n') cnt--; tbuf = 0; if (cp == line || *--cp != '\n' || cp == line) goto getline; *cp = '\0'; if (rlogin == _POSIX_VDISABLE) printf("%s\r\n", line); } else { getline: if (rlogin != _POSIX_VDISABLE) printf("%s> ", prompt); if (fgets(line, sizeof(line), stdin) == NULL) { if (feof(stdin) || ferror(stdin)) { quit(); /*NOTREACHED*/ } break; } } if (line[0] == 0) break; makeargv(); if (margv[0] == 0) { break; } c = getcmd(margv[0]); if (Ambiguous(c)) { printf("?Ambiguous command\r\n"); continue; } if (c == 0) { printf("?Invalid command\r\n"); continue; } if (c->needconnect && !connected) { printf("?Need to be connected first.\r\n"); continue; } if ((*c->handler)(margc, margv)) { break; } } if (!top) { if (!connected) { longjmp(toplevel, 1); /*NOTREACHED*/ } setconnmode(0); } } /* * Help command. */ static int help(int argc, char **argv) { Command *c; if (argc == 1) { printf("Commands may be abbreviated. Commands are:\r\n\r\n"); for (c = cmdtab; c->name; c++) if (c->help) { printf("%-*s\t%s\r\n", HELPINDENT, c->name, c->help); } return 0; } while (--argc > 0) { char *arg; arg = *++argv; c = getcmd(arg); if (Ambiguous(c)) printf("?Ambiguous help command %s\r\n", arg); else if (c == (Command *)0) printf("?Invalid help command %s\r\n", arg); else printf("%s\r\n", c->help); } return 0; } #if defined(IP_OPTIONS) && defined(IPPROTO_IP) /* * Source route is handed in as * [!]@hop1@hop2...@dst * * If the leading ! is present, it is a strict source route, otherwise it is * assmed to be a loose source route. Note that leading ! is effective * only for IPv4 case. * * We fill in the source route option as * hop1,hop2,hop3...dest * and return a pointer to hop1, which will * be the address to connect() to. * * Arguments: * ai: The address (by struct addrinfo) for the final destination. * * arg: Pointer to route list to decipher * * cpp: Pointer to a pointer, so that sourceroute() can return * the address of result buffer (statically alloc'ed). * * protop/optp: * Pointer to an integer. The pointed variable * lenp: pointer to an integer that contains the * length of *cpp if *cpp != NULL. * * Return values: * * Returns the length of the option pointed to by *cpp. If the * return value is -1, there was a syntax error in the * option, either arg contained unknown characters or too many hosts, * or hostname cannot be resolved. * * The caller needs to pass return value (len), *cpp, *protop and *optp * to setsockopt(2). * * *cpp: Points to the result buffer. The region is statically * allocated by the function. * * *protop: * protocol # to be passed to setsockopt(2). * * *optp: option # to be passed to setsockopt(2). * */ int sourceroute(struct addrinfo *ai, char *arg, char **cpp, int *protop, int *optp) { char *cp, *cp2, *lsrp = NULL, *lsrep = NULL; struct addrinfo hints, *res; int len, error; struct sockaddr_in *sin; register char c; static char lsr[44]; #ifdef INET6 struct cmsghdr *cmsg = NULL; struct sockaddr_in6 *sin6; static char rhbuf[1024]; #endif /* * Verify the arguments. */ if (cpp == NULL) return -1; cp = arg; *cpp = NULL; switch (ai->ai_family) { case AF_INET: lsrp = lsr; lsrep = lsrp + sizeof(lsr); /* * Next, decide whether we have a loose source * route or a strict source route, and fill in * the begining of the option. */ if (*cp == '!') { cp++; *lsrp++ = IPOPT_SSRR; } else *lsrp++ = IPOPT_LSRR; if (*cp != '@') return -1; lsrp++; /* skip over length, we'll fill it in later */ *lsrp++ = 4; cp++; *protop = IPPROTO_IP; *optp = IP_OPTIONS; break; #ifdef INET6 case AF_INET6: /* this needs to be updated for rfc2292bis */ #ifdef IPV6_PKTOPTIONS cmsg = inet6_rthdr_init(rhbuf, IPV6_RTHDR_TYPE_0); if (*cp != '@') return -1; cp++; *protop = IPPROTO_IPV6; *optp = IPV6_PKTOPTIONS; break; #else return -1; #endif #endif default: return -1; } memset(&hints, 0, sizeof(hints)); hints.ai_family = ai->ai_family; hints.ai_socktype = SOCK_STREAM; for (c = 0;;) { if (c == ':') cp2 = 0; else for (cp2 = cp; (c = *cp2) != '\0'; cp2++) { if (c == ',') { *cp2++ = '\0'; if (*cp2 == '@') cp2++; } else if (c == '@') { *cp2++ = '\0'; } #if 0 /*colon conflicts with IPv6 address*/ else if (c == ':') { *cp2++ = '\0'; } #endif else continue; break; } if (!c) cp2 = 0; error = getaddrinfo(cp, NULL, &hints, &res); if (error) { fprintf(stderr, "%s: %s\n", cp, gai_strerror(error)); return -1; } if (ai->ai_family != res->ai_family) { freeaddrinfo(res); return -1; } if (ai->ai_family == AF_INET) { /* * Check to make sure there is space for address */ if (lsrp + 4 > lsrep) { freeaddrinfo(res); return -1; } sin = (struct sockaddr_in *)res->ai_addr; memcpy(lsrp, &sin->sin_addr, sizeof(struct in_addr)); lsrp += sizeof(struct in_addr); } #ifdef INET6 else if (ai->ai_family == AF_INET6) { sin6 = (struct sockaddr_in6 *)res->ai_addr; inet6_rthdr_add(cmsg, &sin6->sin6_addr, IPV6_RTHDR_LOOSE); } #endif else { freeaddrinfo(res); return -1; } freeaddrinfo(res); if (cp2) cp = cp2; else break; } if (ai->ai_family == AF_INET) { /* record the last hop */ if (lsrp + 4 > lsrep) return -1; sin = (struct sockaddr_in *)ai->ai_addr; memcpy(lsrp, &sin->sin_addr, sizeof(struct in_addr)); lsrp += sizeof(struct in_addr); #ifndef sysV88 lsr[IPOPT_OLEN] = lsrp - lsr; if (lsr[IPOPT_OLEN] <= 7 || lsr[IPOPT_OLEN] > 40) return -1; *lsrp++ = IPOPT_NOP; /*32bit word align*/ len = lsrp - lsr; *cpp = lsr; #else ipopt.io_len = lsrp - lsr; if (ipopt.io_len <= 5) /*is 3 better?*/ return -1; *cpp = (char 8)&ipopt; #endif } #ifdef INET6 else if (ai->ai_family == AF_INET6) { inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); len = cmsg->cmsg_len; *cpp = rhbuf; } #endif else return -1; return len; } #endif