deb-mbse/lib/clcomm.c

/*****************************************************************************
 *
 * Purpose ...............: Client/Server communications
 *
 *****************************************************************************
 * Copyright (C) 1997-2011
 *   
 * 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 "mbselib.h"


int		do_quiet = FALSE;	/* Quiet flag			    */
int		show_log = FALSE;	/* Show loglines on screen	    */
int		most_debug = FALSE;	/* Toggle normal/most debugging	    */
int		tcp_regged = FALSE;	/* Safety TCP registration flag	    */
char		progname[21];		/* Program name			    */
char		logdebug[PATH_MAX];	/* Debug logfile		    */
char		logfile[PATH_MAX];	/* Normal logfile		    */
char		errfile[PATH_MAX];	/* Error logfile		    */
char		mgrfile[PATH_MAX];	/* Area/File- mgr logfile	    */
int		loggrade;		/* Logging grade		    */
pid_t		mypid;			/* Original parent pid if child	    */
unsigned int	lcrc = 0, tcrc = 1;	/* CRC value of logstring	    */
int		lcnt = 0;		/* Same message counter		    */
static char	*pbuff = NULL;
extern char	cpath[108];
extern char	spath[108];



char *xmalloc(size_t size)
{
        char *tmp;

        tmp = malloc(size);
        if (!tmp) 
		abort();
        
        return tmp;
}



char *xstrcpy(char *src)
{
	char	*tmp;

	if (src == NULL) 
		return(NULL);
	tmp = xmalloc(strlen(src)+1);
	strcpy(tmp, src);
	return tmp;
}



char *xstrcat(char *src, char *add)
{
	char	*tmp;
	size_t	size = 0;

	if ((add == NULL) || (strlen(add) == 0))
		return src;
	if (src)
		size = strlen(src);
	size += strlen(add);
	tmp = xmalloc(size + 1);
	*tmp = '\0';
	if (src) {
		strcpy(tmp, src);
		free(src);
	}
	strcat(tmp, add);
	return tmp;
}




void InitClient(char *user, char *myname, char *where, char *logfname, int loggr, char *err, char *mgr, char *debug)
{
    if ((getenv("MBSE_ROOT")) == NULL) {
	printf("Could not get the MBSE_ROOT environment variable\n");
	printf("Please set the environment variable ie:\n");
	printf("\"MBSE_ROOT=/opt/mbse; export MBSE_ROOT\"\n\n");
	exit(MBERR_INIT_ERROR);
    }

    snprintf(progname, 20, "%s", myname);
    snprintf(logfile, PATH_MAX -1, "%s", logfname);
    snprintf(errfile, PATH_MAX -1, "%s", err);
    snprintf(mgrfile, PATH_MAX -1, "%s", mgr);
    snprintf(logdebug, PATH_MAX -1, "%s", debug);
    loggrade = loggr;

    snprintf(cpath, 107, "%s/tmp/%s%d", getenv("MBSE_ROOT"), progname, getpid());
    snprintf(spath, 107, "%s/tmp/mbtask", getenv("MBSE_ROOT"));

    /*
     * Store my pid in case a child process is forked and wants to do
     * some communications with the mbsed server.
     */
    mypid = getpid();
    if (socket_connect(user, myname, where) == -1) {
        printf("PANIC: cannot access socket\n");
        exit(MBERR_INIT_ERROR);
    }
}



void ExitClient(int errcode)
{
	if (socket_shutdown(mypid) == -1)
		printf("PANIC: unable to shutdown socket\n");
	unlink(cpath);
	fflush(stdout);
	fflush(stdin);

	if (pbuff)
		free(pbuff);

	exit(errcode);
}



void SockS(const char *format, ...)
{
	char	*out;
	va_list	va_ptr;

	out = calloc(SS_BUFSIZE, sizeof(char));

	va_start(va_ptr, format);
	vsnprintf(out, SS_BUFSIZE, format, va_ptr);
	va_end(va_ptr);

	if (socket_send(out) == 0)
		socket_receive();

	free(out);
}



char *SockR(const char *format, ...)
{
	static char	buf[SS_BUFSIZE];
	char		*out;
	va_list		va_ptr;

	memset(&buf, 0, SS_BUFSIZE);
	out = calloc(SS_BUFSIZE, sizeof(char));

	va_start(va_ptr, format);
	vsnprintf(out, SS_BUFSIZE, format, va_ptr);
	va_end(va_ptr);

	if (socket_send(out) == 0)
		snprintf(buf, SS_BUFSIZE, "%s", socket_receive());

	free(out);
	return buf;
}



void WriteError(const char *format, ...)
{
    char    *outputstr, *temp;
    va_list va_ptr;
    int	    i;

    outputstr = calloc(10240, sizeof(char));

    va_start(va_ptr, format);
    vsnprintf(outputstr, 10240, format, va_ptr);

    va_end(va_ptr);

    for (i = 0; i < strlen(outputstr); i++)
	if (outputstr[i] == '\r' || outputstr[i] == '\n')
	    outputstr[i] = ' ';

    if (*outputstr == '$')
	snprintf(outputstr+strlen(outputstr), 10240, ": %s", strerror(errno));

    if (strlen(outputstr) > (SS_BUFSIZE - 64)) {
	outputstr[SS_BUFSIZE - 65] = ';';
	outputstr[SS_BUFSIZE - 64] = '\0';
    }
    tcrc = StringCRC32(outputstr);
    if (tcrc == lcrc) {
	lcnt++;
	free(outputstr);
	return;
    } else {
	lcrc = tcrc;
	if (lcnt) {
	    lcnt++;
	    SockS("ALOG:5,%s,%s,%d,?,Last message repeated %d times;", logdebug, progname, mypid, lcnt);
	    SockS("ALOG:5,%s,%s,%d,?,Last message repeated %d times;", logfile, progname, mypid, lcnt);
	    SockS("ALOG:5,%s,%s,%d,?,Last message repeated %d times;", errfile, progname, mypid, lcnt);
	}
	lcnt = 0;
    }

    if (*outputstr == '$') {
	temp = xstrcpy(clencode(outputstr+1));
    } else {
	temp = xstrcpy(clencode(outputstr));
    }
    SockS("ALOG:5,%s,%s,%d,?,%s;", logdebug, progname, mypid, temp);
    SockS("ALOG:5,%s,%s,%d,?,%s;", logfile, progname, mypid, temp);
    SockS("ALOG:5,%s,%s,%d,?,%s;", errfile, progname, mypid, temp);
    free(temp);
    free(outputstr);
}



/*
 * Standard system logging
 */
void Syslog(int level, const char *format, ...)
{
    char	*outstr;
    va_list	va_ptr;

    outstr = calloc(10240, sizeof(char));

    va_start(va_ptr, format);
    vsnprintf(outstr, 10240, format, va_ptr);
    va_end(va_ptr);
    Syslogp(level, outstr);
    free(outstr);
}



/*
 * System logging without string formatting.
 */
void Syslogp(int level, char *outstr)
{
    int	    mask = 0;
    int	    i, upper, debug;

    debug = isalpha(level);
    upper = isupper(level);

    switch(tolower(level)) {
	case ' ' : mask = DLOG_ALLWAYS;	    break;
	case '?' : mask = DLOG_ERROR;	    break;	
	case '!' : mask = DLOG_ATTENT;	    break;
	case '+' : mask = DLOG_NORMAL;	    break;
	case '-' : mask = DLOG_VERBOSE;	    break;
	case 'a' : mask = DLOG_TCP;	    break;
	case 'b' : mask = DLOG_BBS;	    break;
	case 'c' : mask = DLOG_CHAT;	    break;
	case 'd' : mask = DLOG_DEVIO;	    break;
	case 'e' : mask = DLOG_EXEC;	    break;
	case 'f' : mask = DLOG_FILEFWD;	    break;
	case 'h' : mask = DLOG_HYDRA;	    break;
	case 'i' : mask = DLOG_IEMSI;	    break;
	case 'l' : mask = DLOG_LOCK;	    break;
	case 'm' : mask = DLOG_MAIL;	    break;
	case 'n' : mask = DLOG_NODELIST;    break;
	case 'o' : mask = DLOG_OUTSCAN;	    break;
	case 'p' : mask = DLOG_PACK;	    break;
	case 'r' : mask = DLOG_ROUTE;	    break;
	case 's' : mask = DLOG_SESSION;	    break;
	case 't' : mask = DLOG_TTY;	    break;
	case 'x' : mask = DLOG_XMODEM;	    break;
	case 'z' : mask = DLOG_ZMODEM;	    break;
    }

    if (((loggrade | DLOG_ALLWAYS | DLOG_ERROR) & mask) == 0)
	return;

    /*
     * Don't log uppercase debug levels when most_debug is FALSE
     */
    if (upper && !most_debug)
	return;

    for (i = 0; i < strlen(outstr); i++)
	if (outstr[i] == '\r' || outstr[i] == '\n')
	    outstr[i] = ' ';
    if (strlen(outstr) > (SS_BUFSIZE - 64))
	outstr[SS_BUFSIZE - 64] = '\0';

    tcrc = StringCRC32(outstr);
    if (tcrc == lcrc) {
	lcnt++;
	return;
    } else {
	lcrc = tcrc;
	if (lcnt) {
	    lcnt++;
	    SockS("ALOG:5,%s,%s,%d,%c,Last message repeated %d times;", logdebug, progname, mypid, level, lcnt);
	    if (!debug)
		SockS("ALOG:5,%s,%s,%d,%c,Last message repeated %d times;", logfile, progname, mypid, level, lcnt);
	}
	lcnt = 0;
    }

    if (show_log)
	printf("%c %s\n", level, outstr);

    if (*outstr == '$') {
	SockS("ALOG:5,%s,%s,%d,%c,%s: %s;", logdebug, progname, mypid, level, clencode(outstr+1), strerror(errno));
	if (!debug)
	    SockS("ALOG:5,%s,%s,%d,%c,%s: %s;", logfile, progname, mypid, level, clencode(outstr+1), strerror(errno));
    } else {
	SockS("ALOG:5,%s,%s,%d,%c,%s;", logdebug, progname, mypid, level, clencode(outstr));
	if (!debug)
	    SockS("ALOG:5,%s,%s,%d,%c,%s;", logfile, progname, mypid, level, clencode(outstr));
    }
}



void Mgrlog(const char *format, ...)
{
    char    *outstr;
    va_list va_ptr;
    int	    i;

    outstr = calloc(10240, sizeof(char));

    va_start(va_ptr, format);
    vsnprintf(outstr, 10240, format, va_ptr);
    va_end(va_ptr);

    for (i = 0; i < strlen(outstr); i++)
	if (outstr[i] == '\r' || outstr[i] == '\n')
	    outstr[i] = ' ';
    if (strlen(outstr) > (SS_BUFSIZE - 64))
	outstr[SS_BUFSIZE - 64] = '\0';
    
    SockS("ALOG:5,%s,%s,%d,+,%s;", mgrfile, progname, mypid, clencode(outstr));
    Syslogp('+', outstr);
    free(outstr);
}



void IsDoing(const char *format, ...)
{
    char	*outputstr;
    va_list	va_ptr;

    outputstr = calloc(SS_BUFSIZE, sizeof(char));

    va_start(va_ptr, format);
    vsnprintf(outputstr, SS_BUFSIZE, format, va_ptr);
    va_end(va_ptr);

    SockS("ADOI:2,%d,%s;", mypid, clencode(outputstr));
    free(outputstr);
}



void RegTCP(void)
{
    if (!tcp_regged)
	SockS("ATCP:1,%d;", mypid);

    tcp_regged = TRUE;
}



void SetTTY(char *tty)
{
    SockS("ATTY:2,%d,%s;", mypid, tty);
}



void UserCity(pid_t pid, char *user, char *city)
{
    char    *u, *c;

    u = xstrcpy(clencode(user));
    c = xstrcpy(clencode(city));
    SockS("AUSR:3,%d,%s,%s;", pid, u, c);
    free(u);
    free(c);
}



void DoNop()
{
    SockS("GNOP:1,%d;", mypid);
}



static time_t	nop = 0;

/*
 * This function can be called very often but will only send once a minute
 * a NOP to the server. This is a simple solution to keep server trafic low.
 */
void Nopper(void)
{
    time_t  now;

    now = time(NULL);
    if ((now - nop) > 60) {
	nop = now;
	SockS("GNOP:1,%d;", mypid);
    }
}



/*
 * Set new alarmtime for Client/Server connection,
 * if zero set the default time.
 */
void Altime(int altime)
{
    if (altime)
	SockS("ATIM:2,%d,%d;", mypid, altime);
    else
	SockS("ADEF:1,%d;", mypid);
}



unsigned int sequencer()
{
    char	    *buf, *res;
    unsigned int    seq = 0;

    buf = calloc(SS_BUFSIZE, sizeof(char));
    snprintf(buf, SS_BUFSIZE, "SSEQ:0;");

    if (socket_send(buf) == 0) {
	free(buf);
	buf = socket_receive();
	res = strtok(buf, ",");
	res = strtok(NULL, ";");
	seq = atol(res);
    }

    return seq;
}



/*
 * Check enough diskspace.
 * return 0=No, 1=Yes, 2=Unknown, 3=Error
 */
int enoughspace(unsigned int needed)
{
    char	    *buf;
    int		    rc = 3, cnt;
    unsigned int    avail = 0L;

    buf = calloc(SS_BUFSIZE, sizeof(char));
    snprintf(buf, SS_BUFSIZE, "DSPC:1,%d;", needed);

    if (socket_send(buf) == 0) {
	snprintf(buf, SS_BUFSIZE, "%s", socket_receive());
	strtok(buf, ":");
	cnt = atoi(strtok(NULL, ","));
	if (cnt == 1) {
	    rc = atoi(strtok(NULL, ";"));
	} else if (cnt == 2) {
	    rc = atoi(strtok(NULL, ","));
	    avail = atol(strtok(NULL, ";"));
	    if (rc == 0)
		Syslog('+', "Only %ld MBytes diskspace, need %ld MBytes", avail, needed);
	} else {
	    Syslog('-', "Error in enoughspace()");
	}
    }

    free(buf);
    return rc;
}



char *clencode(char *s)
{
    char        Base16Code[]="0123456789ABCDEF";
    static char *buf;
    char        *p, *q;

    if (buf)
	free(buf);
    buf = NULL;
    if (s == NULL)
	return NULL;
			        
    if ((buf = malloc(3 * strlen(s) + 1 * sizeof(char))) == NULL) {
	Syslog('+', "clencode: out of memory:string too long:\"%s\"", s);
	return s;
    }
    for (p = s, q = buf; *p != '\0';) {
	if (( ! isascii(*p)) || (*p == '%') || (*p == ',') || (*p == ';') || (*p == '"')) {
	    *q++ = '\\';
	    *q++ = Base16Code[(*p >> 4) & 0x0f];
	    *q++ = Base16Code[*p & 0x0f];
	    p++;
	} else if (*p == '\\') {
	    *q++ = '\\';
	    *q++ = *p++;
	} else {
	    *q++ = *p++;
	}
    }
    *q = '\0';
    return buf;
}



char *cldecode(char *s)
{
    char    *p, *q;
    int	    i;

    if ((s == NULL) || (! strlen(s))) {
	return (char *)"";
    }

    for (p = s, q = s; *p; p++) {
	if (*p == '\\') {
	    if (*(p + 1) == '\\') {
		*q++ = *p++;
	    } else {
		sscanf(p + 1, "%02x", &i);
		*q++ = i;
		p += 2;
	    }
	} else {
	    *q++ = *p;
	}
    }

    *q = '\0';
    return s;
}



char *printable(char *s, int l)
{
    int		    len;
    char	    *p;
    unsigned char   c;

    if (pbuff) 
	free(pbuff);
    pbuff=NULL;

    if (s == NULL) 
	return (char *)"(null)";

    if (l > 0) 
	len=l;
    else if (l == 0) 
	len=strlen(s);
    else {
	len=strlen(s);
	if (len > -l) 
	    len=-l;
    }

    pbuff=(char*)xmalloc(len*3+1);
    p=pbuff;
    while (len--) {
	/*
	 * Don't use isprint to check if a character is printable because we
	 * don't want some current locale to have some influence on this
	 * conversion. Just filter low ascii values.
	 */
	c = *(unsigned char*)s;
	if ((c >= 32) && (c < 128))
	    *p++=*s;
	else 
	    switch (*s) {
		case '\\': *p++='\\'; *p++='\\'; break;
		case '\r': *p++='\\'; *p++='r'; break;
		case '\n': *p++='\\'; *p++='n'; break;
		case '\t': *p++='\\'; *p++='t'; break;
		case '\b': *p++='\\'; *p++='b'; break;
		default:   snprintf(p, 5, "\\%02x", (*s & 0xff)); p+=3; break;
	    }
	s++;
    }
    *p='\0';
    return pbuff;
}



char *printablec(char c)
{
    return printable(&c,1);
}