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deb-mbse/mbnntp/mbnntp.c

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/*****************************************************************************
*
* Purpose ...............: MBSE NNTP Server
*
*****************************************************************************
* Copyright (C) 1997-2011
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*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* MBSE BBS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include "../lib/mbselib.h"
#include "../lib/users.h"
#include "../lib/mbsedb.h"
#include "../lib/msg.h"
#include "openport.h"
#include "ttyio.h"
#include "auth.h"
#include "commands.h"
#include "mbnntp.h"
time_t t_start;
time_t t_end;
char *envptr = NULL;
struct sockaddr_in peeraddr4;
struct sockaddr_in6 peeraddr6;
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pid_t mypid;
unsigned int rcvdbytes = 0L;
unsigned int sentbytes = 0L;
int do_mailout = FALSE;
extern char *ttystat[];
extern int authorized;
void die(int onsig)
{
signal(onsig, SIG_IGN);
CloseDupes();
Msg_Close();
if (onsig) {
if (onsig <= NSIG)
WriteError("Terminated on signal %d (%s)", onsig, SigName[onsig]);
else
WriteError("Terminated with error %d", onsig);
}
if (do_mailout)
CreateSema((char *)"mailout");
t_end = time(NULL);
Syslog('+', "Send [%6lu] Received [%6lu]", sentbytes, rcvdbytes);
Syslog(' ', "MBNNTP finished in %s", t_elapsed(t_start, t_end));
if (envptr)
free(envptr);
ExitClient(onsig);
msleep(1); /* For the linker only */
}
#ifndef USE_NEWSGATE
/*
* Check if the system is available.
*/
int check_free(void);
int check_free(void)
{
char buf[128];
strcpy(buf, SockR("SBBS:0;"));
if (strncmp(buf, "100:2,1", 7) == 0) {
Syslog('+', "The system is closed");
return FALSE;
}
return TRUE;
}
#endif
#ifdef HAVE_GEOIP_H
extern void _GeoIP_setup_dbfilename(void);
void geoiplookup(GeoIP* gi, char *hostname, int i)
{
const char * country_code;
const char * country_name;
const char * country_continent;
int country_id;
if (GEOIP_COUNTRY_EDITION == i) {
country_id = GeoIP_id_by_name(gi, hostname);
country_code = GeoIP_country_code[country_id];
country_name = GeoIP_country_name[country_id];
country_continent = GeoIP_country_continent[country_id];
if (country_code == NULL) {
Syslog('+', "%s: IP Address not found\n", GeoIPDBDescription[i]);
} else {
Syslog('+', "GeoIP location: %s, %s %s\n", country_name, country_code, country_continent);
}
}
if (GEOIP_COUNTRY_EDITION_V6 == i) {
country_id = GeoIP_id_by_name_v6(gi, hostname);
country_code = GeoIP_country_code[country_id];
country_name = GeoIP_country_name[country_id];
country_continent = GeoIP_country_continent[country_id];
if (country_code == NULL) {
Syslog('+', "%s: IP Address not found\n", GeoIPDBDescription[i]);
} else {
Syslog('+', "GeoIP location: %s, %s %s\n", country_name, country_code, country_continent);
}
}
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}
#endif
int main(int argc, char *argv[])
{
struct passwd *pw;
int i, rc;
socklen_t addrlen = sizeof(struct sockaddr_in6);
char str[INET6_ADDRSTRLEN];
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#ifdef HAVE_GEOIP_H
GeoIP *gi;
#endif
/*
* The next trick is to supply a fake environment variable
* MBSE_ROOT because this program is started from inetd.
* This will setup the variable so InitConfig() will work.
* The /etc/passwd must point to the correct homedirectory.
*/
pw = getpwuid(geteuid());
if (getenv("MBSE_ROOT") == NULL) {
envptr = xstrcpy((char *)"MBSE_ROOT=");
envptr = xstrcat(envptr, pw->pw_dir);
putenv(envptr);
}
mypid = getpid();
/*
* Read the global configuration data, registrate connection
*/
InitConfig();
InitMsgs();
InitUser();
InitFidonet();
InitNode();
umask(002);
memset(&usrconfig, 0, sizeof(usrconfig));
t_start = time(NULL);
InitClient(pw->pw_name, (char *)"mbnntp", CFG.location, CFG.logfile,
CFG.util_loglevel, CFG.error_log, CFG.mgrlog, CFG.debuglog);
Syslog(' ', "MBNNTP v%s", VERSION);
IsDoing("Loging in");
#ifdef USE_NEWSGATE
WriteError("MBSEBBS is compiled for full newsgate, you cannot use mbnntp!");
#endif
/*
* Catch all the signals we can, and ignore the rest.
*/
for(i = 0; i < NSIG; i++) {
if ((i == SIGINT) || (i == SIGBUS) || (i == SIGILL) || (i == SIGSEGV) || (i == SIGTERM) || (i == SIGIOT))
signal(i, (void (*))die);
else if (i == SIGCHLD)
signal(i, SIG_DFL);
else if ((i != SIGKILL) && (i != SIGSTOP))
signal(i, SIG_IGN);
}
if ((rc = rawport()) != 0)
WriteError("Unable to set raw mode");
else {
if (getpeername(0,(struct sockaddr*)&peeraddr6,&addrlen) == 0) {
/*
* Copy IPv4 part into the IPv6 structure. There has to be a better way
* to deal with mixed incoming sockets ???
*/
memcpy(&peeraddr4, &peeraddr6, sizeof(struct sockaddr_in));
if ((peeraddr6.sin6_family == AF_INET6) && (inet_ntop(AF_INET6, &peeraddr6.sin6_addr, str, sizeof(str)))) {
Syslog('+', "Incoming IPv6 connection from %s", str);
} else if ((peeraddr4.sin_family == AF_INET) && (inet_ntop(AF_INET, &peeraddr4.sin_addr, str, sizeof(str)))) {
Syslog('+', "Incoming IPv4 connection from %s", str);
}
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#ifdef HAVE_GEOIP_H
_GeoIP_setup_dbfilename();
if (peeraddr6.sin6_family == AF_INET6) {
if (GeoIP_db_avail(GEOIP_COUNTRY_EDITION_V6)) {
if ((gi = GeoIP_open_type(GEOIP_COUNTRY_EDITION_V6, GEOIP_STANDARD)) != NULL) {
geoiplookup(gi, str, GEOIP_COUNTRY_EDITION_V6);
}
GeoIP_delete(gi);
}
} else if (peeraddr6.sin6_family == AF_INET) {
if (GeoIP_db_avail(GEOIP_COUNTRY_EDITION)) {
if ((gi = GeoIP_open_type(GEOIP_COUNTRY_EDITION, GEOIP_STANDARD)) != NULL) {
geoiplookup(gi, str, GEOIP_COUNTRY_EDITION);
}
GeoIP_delete(gi);
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}
}
#endif
#ifdef USE_NEWSGATE
send_nntp("400 Server closed");
#else
if (! check_free()) {
send_nntp("400 Server closed");
} else {
send_nntp("200 MBNNTP v%s server ready -- posting allowed", VERSION);
nntp();
}
#endif
}
}
cookedport();
die(0);
return 0;
}
#ifndef USE_NEWSGATE
/*
* Get command from the client.
* return < 0: error
* return >= 0: size of buffer
*/
int get_nntp(char *buf, int max)
{
int c, len;
len = 0;
memset(buf, 0, sizeof(*buf));
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while (TRUE) {
c = tty_getc(180);
if (c <= 0) {
if (c == -2) {
/*
* Timeout
*/
send_nntp("400 Service discontinued, timeout");
}
Syslog('+', "Receiver status %s", ttystat[- c]);
return c;
}
if ((c == '\r') || (c == '\n')) {
rcvdbytes += (len + 1);
return len;
}
else {
buf[len] = c;
len++;
buf[len] = '\0';
}
if (len >= max) {
WriteError("Input buffer full");
return len;
}
}
return 0; /* Not reached */
}
#endif
void send_nntp(const char *format, ...)
{
char *out, p[4];
va_list va_ptr;
out = calloc(4096, sizeof(char));
va_start(va_ptr, format);
vsnprintf(out, 4096, format, va_ptr);
va_end(va_ptr);
/*
* Only log responses
*/
if (out[3] == ' ') {
memset(&p, 0, sizeof(p));
strncpy(p, out, 3);
if (atoi(p) > 0) {
Syslog('n', "> \"%s\"", printable(out, 0));
}
}
PUTSTR(out);
PUTSTR((char *)"\r\n");
FLUSHOUT();
sentbytes += (strlen(out) + 2);
free(out);
}
#ifndef USE_NEWSGATE
void nntp(void)
{
char buf[4096];
int len;
while (TRUE) {
IsDoing("Waiting");
len = get_nntp(buf, sizeof(buf) -1);
if (len < 0)
return;
if (len == 0)
continue;
if (strcasestr(buf, (char *)"AUTHINFO PASS") == NULL) {
Syslog('n', "< \"%s\"", printable(buf, 0));
} else {
Syslog('n', "< \"AUTHINFO PASS ********\"");
}
if (! check_free()) {
send_nntp("400 server closed");
return;
}
/*
* Process received command
*/
if (strncasecmp(buf, "QUIT", 4) == 0) {
send_nntp("205 Goodbye\r\n");
return;
} else if (strncasecmp(buf, "AUTHINFO USER", 13) == 0) {
auth_user(buf);
} else if (strncasecmp(buf, "AUTHINFO PASS", 13) == 0) {
auth_pass(buf);
} else if (strncasecmp(buf, "ARTICLE", 7) == 0) {
if (check_auth(buf))
command_abhs(buf);
} else if (strncasecmp(buf, "BODY", 4) == 0) {
if (check_auth(buf))
command_abhs(buf);
} else if (strncasecmp(buf, "LIST", 4) == 0) {
if (check_auth(buf))
command_list(buf);
} else if (strncasecmp(buf, "GROUP", 5) == 0) {
if (check_auth(buf))
command_group(buf);
} else if (strncasecmp(buf, "HEAD", 4) == 0) {
if (check_auth(buf))
command_abhs(buf);
} else if (strncasecmp(buf, "POST", 4) == 0) {
if (check_auth(buf))
command_post(buf);
} else if (strncasecmp(buf, "IHAVE", 5) == 0) {
send_nntp("435 Article not wanted - do not send it");
} else if (strncasecmp(buf, "NEWGROUPS", 9) == 0) {
send_nntp("235 Warning: NEWGROUPS not implemented, returning empty list");
send_nntp(".");
} else if (strncasecmp(buf, "NEWNEWS", 7) == 0) {
send_nntp("230 Warning: NEWNEWS not implemented, returning empty list");
send_nntp(".");
} else if (strncasecmp(buf, "SLAVE", 5) == 0) {
send_nntp("202 Slave status noted");
} else if (strncasecmp(buf, "STAT", 4) == 0) {
if (check_auth(buf))
command_abhs(buf);
} else if (strncasecmp(buf, "MODE READER", 11) == 0) {
if (check_auth(buf)) {
if (authorized)
send_nntp("200 Server ready, posting allowed");
else
send_nntp("201 Server ready, no posting allowed");
}
} else if (strncasecmp(buf, "XOVER", 5) == 0) {
if (check_auth(buf))
command_xover(buf);
} else if (strncasecmp(buf, "HELP", 4) == 0) {
send_nntp("100 Help text follows");
send_nntp("Recognized commands:");
send_nntp("");
send_nntp("ARTICLE");
send_nntp("AUTHINFO");
send_nntp("BODY");
send_nntp("GROUP");
send_nntp("HEAD");
send_nntp("IHAVE (not implemented, messages are always rejected)");
send_nntp("LIST");
send_nntp("NEWGROUPS (not implemented, always returns an empty list)");
send_nntp("NEWNEWS (not implemented, always returns an empty list)");
send_nntp("POST");
send_nntp("QUIT");
send_nntp("SLAVE (has no effect)");
send_nntp("STAT");
send_nntp("XOVER");
send_nntp("");
send_nntp("MBNNTP supports most of RFC-977 and also has support for AUTHINFO and");
send_nntp("limited XOVER support (RFC-2980)");
send_nntp(".");
} else {
send_nntp("500 Unknown command");
}
}
}
#endif