Arquivotheca.SunOS-4.1.3/ucb/lpr/common.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)common.c 1.1 92/07/30 SMI"; /* from UCB 5.2 5/6/86 */
#endif not lint

/*
 * Routines and data common to all the line printer functions.
 */

#include "lp.h"
#include <varargs.h>

int	DU;		/* daemon user-id */
int	MX;		/* maximum number of blocks to copy */
int	MC;		/* maximum number of copies allowed */
char	*LP;		/* line printer device name */
char	*RM;		/* remote machine name */
char	*RP;		/* remote printer name */
char	*LO;		/* lock file name */
char	*ST;		/* status file name */
char	*SD;		/* spool directory */
char	*AF;		/* accounting file */
char	*LF;		/* log file for error messages */
char	*OF;		/* name of output filter (created once) */
char	*IF;		/* name of input filter (created per job) */
char	*RF;		/* name of fortran text filter (per job) */
char	*TF;		/* name of troff filter (per job) */
char	*NF;		/* name of ditroff filter (per job) */
char	*DF;		/* name of tex filter (per job) */
char	*GF;		/* name of graph(1G) filter (per job) */
char	*VF;		/* name of vplot filter (per job) */
char	*CF;		/* name of cifplot filter (per job) */
char	*PF;		/* name of vrast filter (per job) */
char	*FF;		/* form feed string */
char	*TR;		/* trailer string to be output when Q empties */
short	SC;		/* suppress multiple copies */
short	SF;		/* suppress FF on each print job */
short	SH;		/* suppress header page */
short	SB;		/* short banner instead of normal header */
short	HL;		/* print header last */
short	RW;		/* open LP for reading and writing */
int	PW;		/* page width */
int	PL;		/* page length */
int	PX;		/* page width in pixels */
int	PY;		/* page length in pixels */
int	BR;		/* baud rate if lp is a tty */
int	FC;		/* flags to clear if lp is a tty */
int	FS;		/* flags to set if lp is a tty */
int	XC;		/* flags to clear for local mode */
int	XS;		/* flags to set for local mode */
short	RS;		/* restricted to those with local accounts */

char	line[BUFSIZ];
char	pbuf[BUFSIZ/2];	/* buffer for printcap strings */
char	*bp = pbuf;	/* pointer into pbuf for pgetent() */
char	*name;		/* program name */
char	*printer;	/* printer name */
char	host[MAXHOSTNAMELEN + 1]; /* host machine name */
char	*from = host;	/* client's machine name */
int 	from_remote;	/* true if job sent from remote machine */

void exit();
void sleep();
void qsort();
void bcopy();
void bzero();

/*
 * Create a connection to the remote printer server.
 * Most of this code comes from rcmd.c.
 */
getport(rhost)
	char *rhost;
{
	struct hostent *hp;
	struct servent *sp;
	struct sockaddr_in sin;
	int s, lport = IPPORT_RESERVED - 1;
	unsigned timo = 1;
	int err;

	/*
	 * Get the host address and port number to connect to.
	 */
	if (rhost == NULL)
		fatal("no remote host to connect to");
	hp = gethostbyname(rhost);
	if (hp == NULL)
		fatal("unknown host %s", rhost);
	sp = getservbyname("printer", "tcp");
	if (sp == NULL)
		fatal("printer/tcp: unknown service");
	bzero((char *)&sin, sizeof sin);
	bcopy(hp->h_addr, (caddr_t)&sin.sin_addr, hp->h_length);
	sin.sin_family = hp->h_addrtype;
	sin.sin_port = sp->s_port;

	/*
	 * Try connecting to the server.
	 */
retry:
	s = rresvport(&lport);
	if (s < 0)
		return (-1);
	if (connect(s, (struct sockaddr *)&sin, sizeof sin) < 0) {
		err = errno;
		(void) close(s);
		errno = err;
		if (errno == EADDRINUSE) {
			lport--;
			goto retry;
		}
		if (errno == ECONNREFUSED && timo <= 16) {
			sleep(timo);
			timo *= 2;
			goto retry;
		}
		return (-1);
	}
	return s;
}

/*
 * Getline reads a line from the control file cfp, removes tabs, converts
 *  new-line to null and leaves it in line.
 * Returns 0 at EOF or the number of characters read.
 */
getline(cfp)
	FILE *cfp;
{
	register int linel = 0;
	register char *lp = line;
	register c;

	while ((c = getc(cfp)) != '\n') {
		if (c == EOF)
			return 0;
		if (c == '\t') {
			do {
				*lp++ = ' ';
				linel++;
			} while ((linel & 07) != 0);
			continue;
		}
		*lp++ = c;
		linel++;
	}
	*lp++ = '\0';
	return linel;
}

/*
 * Scan the current directory and make a list of daemon files sorted by
 * creation time.
 * Return the number of entries and a pointer to the list.
 */
getq(namelist)
	struct queue ***namelist;
{
	register struct direct *d;
	register struct queue *q, **queue;
	register int nitems;
	struct stat stbuf;
	int arraysz, compar();
	char *realloc();
	DIR *dirp;

	if ((dirp = opendir(SD)) == NULL)
		return (-1);
	if (fstat(dirp->dd_fd, &stbuf) < 0)
		goto errdone;

	/*
	 * Estimate the array size by taking the size of the directory file
	 * and dividing it by a multiple of the minimum size entry.
	 */
	arraysz = (stbuf.st_size / 24);
	queue = (struct queue **)
			malloc((u_int)(arraysz * sizeof (struct queue *)));
	if (queue == NULL)
		goto errdone;

	nitems = 0;
	while ((d = readdir(dirp)) != NULL) {
		if (d->d_name[0] != 'c' || d->d_name[1] != 'f')
			continue;	/* daemon control files only */
		if (stat(d->d_name, &stbuf) < 0)
			continue;	/* Doesn't exist */
		q = (struct queue *)
			malloc((u_int)(sizeof (time_t) + strlen(d->d_name) + 1));
		if (q == NULL)
			goto errdone;
		q->q_time = stbuf.st_mtime;
		strcpy(q->q_name, d->d_name);
		/*
		 * Check to make sure the array has space left and
		 * realloc the maximum size.
		 */
		if (++nitems > arraysz) {
			queue = (struct queue **)realloc((char *)queue,
			(u_int)(stbuf.st_size / 12) * sizeof (struct queue *));
			if (queue == NULL)
				goto errdone;
		}
		queue[nitems - 1] = q;
	}
	closedir(dirp);
	if (nitems)
		qsort((char *)queue, nitems, sizeof (struct queue *), compar);
	*namelist = queue;
	return nitems;

errdone:
	closedir(dirp);
	return (-1);
}

/*
 * Compare modification times.
 */
static
compar(p1, p2)
	register struct queue **p1, **p2;
{
	return ((*p1)->q_time - (*p2)->q_time);
}

/*VARARGS*/
fatal(va_alist)
	va_dcl
{
	va_list args;
	char *fmt;

	if (from != host)
		(void)printf("%s: ", host);
	(void)printf("%s: ", name);
	if (printer)
		(void)printf("%s: ", printer);
	va_start(args);
	fmt = va_arg(args, char *);
	(void)vprintf(fmt, args);
	va_end(args);
	putchar('\n');
	exit(1);
}

/*
 * Check whether a filename is "safe" to read, write, or unlink.  As a
 * first approximation, we just make sure that it does not contain any "/"'s.
 */
int
safepath(name)
	char *name;
{
	return (index(name, '/') == NULL);
}