292 lines
6.4 KiB
C
292 lines
6.4 KiB
C
/*****************************************************************************
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*
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* $Id$
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* Purpose ...............: MBSE BBS Internet Library
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*
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*****************************************************************************
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* Copyright (C) 1997-2005
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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 "mbselib.h"
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#include "mbinet.h"
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static int nntpsock = -1; /* TCP/IP socket */
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struct hostent *nhp; /* Host info remote */
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struct servent *nsp; /* Service information */
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struct sockaddr_in nntp_loc; /* For local socket address */
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struct sockaddr_in nntp_rem; /* For remote socket address */
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int nntp_connect(void)
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{
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int addrlen;
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char *p;
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if (nntpsock != -1)
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return nntpsock;
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if (!strlen(CFG.nntpnode)) {
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WriteError("NNTP: host not configured");
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return -1;
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}
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Syslog('+', "NNTP: connecting host: %s", CFG.nntpnode);
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memset(&nntp_loc, 0, sizeof(struct sockaddr_in));
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memset(&nntp_rem, 0, sizeof(struct sockaddr_in));
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nntp_rem.sin_family = AF_INET;
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if ((nhp = gethostbyname(CFG.nntpnode)) == NULL) {
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WriteError("NNTP: can't find host %s", CFG.nntpnode);
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return -1;
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}
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nntp_rem.sin_addr.s_addr = ((struct in_addr *)(nhp->h_addr))->s_addr;
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if ((nsp = getservbyname("nntp", "tcp")) == NULL) {
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WriteError("NNTP: can't find service port for nntp/tcp");
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return -1;
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}
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nntp_rem.sin_port = nsp->s_port;
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if ((nntpsock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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WriteError("$NNTP: unable to create tcp socket");
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return -1;
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}
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if (connect(nntpsock, (struct sockaddr *)&nntp_rem, sizeof(struct sockaddr_in)) == -1) {
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WriteError("$NNTP: cannot connect tcp socket");
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return -1;
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}
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addrlen = sizeof(struct sockaddr_in);
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if (getsockname(nntpsock, (struct sockaddr *)&nntp_loc, &addrlen) == -1) {
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WriteError("$NNTP: unable to read socket address");
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return -1;
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}
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p = nntp_receive();
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if (strlen(p) == 0) {
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WriteError("NNTP: no response");
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nntp_close();
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return -1;
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}
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Syslog('+', "NNTP: %s", p);
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if (strncmp(p, "480", 3) == 0) {
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/*
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* Must login with username and password
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*/
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if (nntp_auth() == FALSE) {
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WriteError("Authorisation failure");
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nntp_close();
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return -1;
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}
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} else if (strncmp(p, "200", 3)) {
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WriteError("NNTP: bad response: %s", p);
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// nntp_close(); FIXME: Don't close, the other end might have done that already
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// If we do also, this program hangs. Must be fixed!
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return -1;
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}
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if (CFG.modereader) {
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Syslog('+', "NNTP: setting mode reader");
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nntp_send((char *)"MODE READER\r\n");
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p = nntp_receive();
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Syslog('+', "NNTP: %s", p);
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if (strncmp(p, "480", 3) == 0) {
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/*
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* Must login with username and password
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*/
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Syslog('+', "NNTP: %s", p);
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if (nntp_auth() == FALSE) {
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WriteError("NNTP: authorisation failure");
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nntp_close();
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return -1;
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}
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} else if (strncmp(p, "200", 3)) {
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WriteError("NNTP: bad response: %s", p);
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nntp_close();
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return -1;
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}
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}
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return nntpsock;
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}
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int nntp_send(char *buf)
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{
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if (nntpsock == -1)
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return -1;
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if (send(nntpsock, buf, strlen(buf), 0) != strlen(buf)) {
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WriteError("$NNTP: socket send failed");
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if (errno == ENOTCONN || errno == EPIPE) {
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WriteError("NNTP: closing local side");
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nntpsock = -1;
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}
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return -1;
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}
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return 0;
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}
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/*
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* Return empty buffer if something went wrong, else the complete
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* dataline is returned
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*/
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char *nntp_receive(void)
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{
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static char buf[SS_BUFSIZE];
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int i = 0, j;
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if (nntpsock == -1)
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return NULL;
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memset((char *)&buf, 0, SS_BUFSIZE);
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while (TRUE) {
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j = recv(nntpsock, &buf[i], 1, 0);
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if (j == -1) {
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WriteError("$NNTP: error reading socket");
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memset((char *)&buf, 0, SS_BUFSIZE);
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if (errno == ENOTCONN || errno == EPIPE) {
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WriteError("NNTP: closing local side");
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nntpsock = -1;
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}
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return buf;
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}
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if (buf[i] == '\n')
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break;
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i += j;
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}
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for (i = 0; i < strlen(buf); i++) {
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if (buf[i] == '\n')
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buf[i] = '\0';
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if (buf[i] == '\r')
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buf[i] = '\0';
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}
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return buf;
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}
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int nntp_close(void)
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{
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if (nntpsock == -1)
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return 0;
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nntp_cmd((char *)"QUIT\r\n", 205);
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if (shutdown(nntpsock, 1) == -1) {
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WriteError("$NNTP: can't close socket");
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return -1;
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}
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nntpsock = -1;
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Syslog('+', "NNTP: closed");
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return 0;
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}
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/*
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* Send NNTP command, check response code.
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* If the code not matches, the value is returned, else zer.
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*/
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int nntp_cmd(char *cmd, int resp)
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{
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char *p, rsp[6];
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if (nntp_send(cmd) == -1)
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return -1;
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sprintf(rsp, "%d", resp);
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p = nntp_receive();
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if (strncmp(p, "480", 3) == 0) {
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/*
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* Must login with username and password
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*/
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Syslog('+', "NNTP: %s", p);
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if (nntp_auth() == FALSE) {
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WriteError("Authorisation failure");
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nntp_close();
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return -1;
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}
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/*
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* Now send command again, we are now authorized.
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*/
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if (nntp_send(cmd) == -1)
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return -1;
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p = nntp_receive();
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}
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if (strncmp(p, rsp, strlen(rsp))) {
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WriteError("NNTP> %s", cmd);
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WriteError("NNTP< %s", p);
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memset(&resp, 0, sizeof(rsp));
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strncpy(rsp, p, 3);
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return atoi(rsp);
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}
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return 0;
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}
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int nntp_auth(void)
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{
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char *cmd;
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if (!(strlen(CFG.nntpuser) && strlen(CFG.nntppass))) {
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WriteError("NNTP: password required but not configured");
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return FALSE;
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}
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cmd = calloc(128, sizeof(char));
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sprintf(cmd, "AUTHINFO USER %s\r\n", CFG.nntpuser);
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if (nntp_cmd(cmd, 381))
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return FALSE;
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sprintf(cmd, "AUTHINFO PASS %s\r\n", CFG.nntppass);
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if (nntp_cmd(cmd, 281) == 0) {
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free(cmd);
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Syslog('+', "NNTP: logged in");
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return TRUE;
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} else {
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free(cmd);
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return FALSE;
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}
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}
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