311 lines
7.4 KiB
C
311 lines
7.4 KiB
C
/*****************************************************************************
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*
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* $Id$
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* Purpose ...............: Fidonet mailer
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*
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*****************************************************************************
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* Copyright (C) 1997-2003
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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#include "../config.h"
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#include "../lib/libs.h"
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#include "../lib/structs.h"
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#include "../lib/users.h"
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#include "../lib/records.h"
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#include "../lib/common.h"
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#include "../lib/clcomm.h"
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#include "../lib/nodelist.h"
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#include "../lib/dbnode.h"
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#include "session.h"
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#include "ttyio.h"
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#include "openport.h"
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#include "opentcp.h"
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#define BINKPORT 24554
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#define TELNPORT 23
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#define FIDOPORT 60179 /* Eugene G. Crossers birthday */
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static int fd=-1;
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extern int f_flags;
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extern int tcp_mode;
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extern time_t c_start;
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extern time_t c_end;
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extern int online;
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extern int master;
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extern int carrier;
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extern long sentbytes;
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extern long rcvdbytes;
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extern int Loaded;
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char telnet_options[256];
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char do_dont_resp[256];
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char will_wont_resp[256];
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void tel_enter_binary(int rw);
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void tel_leave_binary(int rw);
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void send_do(register int);
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void send_dont(register int);
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void send_will(register int);
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void send_wont(register int);
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static int tcp_is_open = FALSE;
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/* opentcp() was rewritten by Martin Junius */
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/* telnet mode was written by T.Tanaka */
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int opentcp(char *name)
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{
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struct servent *se;
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struct hostent *he;
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int a1, a2, a3, a4, Fd, GotPort = FALSE;
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char *errmsg, *portname;
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short portnum;
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struct sockaddr_in server;
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Syslog('+', "Open TCP connection to \"%s\"", MBSE_SS(name));
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tcp_is_open = FALSE;
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memset(&telnet_options, 0, sizeof(telnet_options));
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server.sin_family = AF_INET;
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/*
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* Get port number from name argument if there is a : part
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*/
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if ((portname = strchr(name,':'))) {
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*portname++='\0';
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if ((portnum = atoi(portname))) {
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server.sin_port=htons(portnum);
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GotPort = TRUE;
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} else if ((se = getservbyname(portname, "tcp"))) {
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server.sin_port = se->s_port;
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GotPort = TRUE;
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}
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}
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/*
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* If not a forced port number, get the defaults.
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*/
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if (! GotPort) {
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switch (tcp_mode) {
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case TCPMODE_IFC: if ((se = getservbyname("fido", "tcp")))
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server.sin_port = se->s_port;
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else
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server.sin_port = htons(FIDOPORT);
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break;
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case TCPMODE_ITN: if ((se = getservbyname("telnet", "tcp")))
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server.sin_port = se->s_port;
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else
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server.sin_port = htons(TELNPORT);
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break;
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case TCPMODE_IBN: if ((se = getservbyname("binkd", "tcp")))
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server.sin_port = se->s_port;
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else
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server.sin_port = htons(BINKPORT);
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break;
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default: server.sin_port = htons(FIDOPORT);
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}
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}
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/*
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* Get IP address for the hostname
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*/
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if (sscanf(name,"%d.%d.%d.%d",&a1,&a2,&a3,&a4) == 4)
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server.sin_addr.s_addr = inet_addr(name);
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else if ((he = gethostbyname(name)))
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memcpy(&server.sin_addr,he->h_addr,he->h_length);
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else {
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switch (h_errno) {
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case HOST_NOT_FOUND: errmsg = (char *)"Authoritative: Host not found"; break;
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case TRY_AGAIN: errmsg = (char *)"Non-Authoritive: Host not found"; break;
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case NO_RECOVERY: errmsg = (char *)"Non recoverable errors"; break;
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default: errmsg = (char *)"Unknown error"; break;
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}
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Syslog('+', "No IP address for %s: %s\n", name, errmsg);
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return -1;
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}
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Syslog('d', "SIGPIPE => sigpipe()");
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signal(SIGPIPE, sigpipe);
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Syslog('d', "SIGHUP => linedrop()");
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signal(SIGHUP, linedrop);
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fflush(stdin);
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fflush(stdout);
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setbuf(stdin,NULL);
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setbuf(stdout,NULL);
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close(0);
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close(1);
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if ((Fd = socket(AF_INET,SOCK_STREAM,0)) != 0) {
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WriteError("$Cannot create socket (got %d, expected 0");
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open("/dev/null",O_RDONLY);
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open("/dev/null",O_WRONLY);
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return -1;
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}
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if (dup(Fd) != 1) {
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WriteError("$Cannot dup socket");
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open("/dev/null",O_WRONLY);
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return -1;
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}
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clearerr(stdin);
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clearerr(stdout);
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if (connect(Fd,(struct sockaddr *)&server,sizeof(server)) == -1) {
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Syslog('+', "Cannot connect %s",inet_ntoa(server.sin_addr));
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return -1;
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}
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f_flags=0;
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if (tcp_mode == TCPMODE_ITN)
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tel_enter_binary(3);
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Syslog('+', "Established %s/TCP connection with %s, port %d",
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(tcp_mode == TCPMODE_ITN) ? "ITN":(tcp_mode == TCPMODE_IFC) ? "IFC":(tcp_mode == TCPMODE_IBN) ? "IBN":"Unknown",
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inet_ntoa(server.sin_addr), (int)ntohs(server.sin_port));
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c_start = time(NULL);
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carrier = TRUE;
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tcp_is_open = TRUE;
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return 0;
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}
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void closetcp(void)
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{
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FILE *fph;
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char *tmp;
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if (!tcp_is_open)
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return;
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if (tcp_mode == TCPMODE_ITN)
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tel_leave_binary(3);
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shutdown(fd, 2);
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Syslog('d', "SIGHUP => SIG_IGN");
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signal(SIGHUP, SIG_IGN);
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Syslog('d', "SIGPIPE => SIG_IGN");
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signal(SIGPIPE, SIG_IGN);
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if (carrier) {
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c_end = time(NULL);
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online += (c_end - c_start);
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Syslog('+', "Closing TCP connection, connected %s", t_elapsed(c_start, c_end));
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carrier = FALSE;
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history.offline = c_end;
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history.online = c_start;
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history.sent_bytes = sentbytes;
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history.rcvd_bytes = rcvdbytes;
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history.inbound = ~master;
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tmp = calloc(PATH_MAX, sizeof(char));
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sprintf(tmp, "%s/var/mailer.hist", getenv("MBSE_ROOT"));
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if ((fph = fopen(tmp, "a")) == NULL)
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WriteError("$Can't open %s", tmp);
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else {
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fwrite(&history, sizeof(history), 1, fph);
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fclose(fph);
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}
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free(tmp);
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memset(&history, 0, sizeof(history));
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if (Loaded) {
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nodes.LastDate = time(NULL);
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UpdateNode();
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}
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}
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tcp_is_open = FALSE;
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}
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void tel_enter_binary(int rw)
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{
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Syslog('d', "Telnet enter binary %d", rw);
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if (rw & 1)
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send_do(TELOPT_BINARY);
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if (rw & 2)
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send_will(TELOPT_BINARY);
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send_dont(TELOPT_ECHO);
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send_do(TELOPT_SGA);
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send_dont(TELOPT_RCTE);
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send_dont(TELOPT_TTYPE);
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send_wont(TELOPT_ECHO);
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send_will(TELOPT_SGA);
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send_wont(TELOPT_RCTE);
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send_wont(TELOPT_TTYPE);
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}
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void tel_leave_binary(int rw)
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{
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Syslog('d', "Telnet leave binary %d", rw);
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if (rw & 1)
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send_dont(TELOPT_BINARY);
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if (rw & 2)
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send_wont(TELOPT_BINARY);
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}
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/*
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* These routines are in charge of sending option negotiations
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* to the other side.
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* The basic idea is that we send the negotiation if either side
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* is in disagreement as to what the current state should be.
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*/
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void send_do(register int c)
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{
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NET2ADD(IAC, DO);
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NETADD(c);
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}
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void send_dont(register int c)
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{
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NET2ADD(IAC, DONT);
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NETADD(c);
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}
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void send_will(register int c)
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{
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NET2ADD(IAC, WILL);
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NETADD(c);
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}
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void send_wont(register int c)
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{
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NET2ADD(IAC, WONT);
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NETADD(c);
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}
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