480 lines
12 KiB
C
480 lines
12 KiB
C
/* $OpenBSD: common.c,v 1.42 2021/01/19 09:04:13 claudio Exp $ */
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/* $NetBSD: common.c,v 1.21 2000/08/09 14:28:50 itojun Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <ifaddrs.h>
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#include "lp.h"
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#include "pathnames.h"
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/*
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* Routines and data common to all the line printer functions.
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*/
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char *AF; /* accounting file */
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long BR; /* baud rate if lp is a tty */
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char *CF; /* name of cifplot filter (per job) */
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char *DF; /* name of tex filter (per job) */
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long DU; /* daemon user-id */
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char *FF; /* form feed string */
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char *GF; /* name of graph(1G) filter (per job) */
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long HL; /* print header last */
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char *IF; /* name of input filter (created per job) */
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char *LF; /* log file for error messages */
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char *LO; /* lock file name */
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char *LP; /* line printer device name */
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long MC; /* maximum number of copies allowed */
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char *MS; /* stty flags to set if lp is a tty */
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long MX; /* maximum number of blocks to copy */
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char *NF; /* name of ditroff filter (per job) */
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char *OF; /* name of output filter (created once) */
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long PL; /* page length */
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long PW; /* page width */
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long PX; /* page width in pixels */
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long PY; /* page length in pixels */
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char *RF; /* name of fortran text filter (per job) */
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char *RG; /* restricted group */
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char *RM; /* remote machine name */
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char *RP; /* remote printer name */
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long RS; /* restricted to those with local accounts */
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long RW; /* open LP for reading and writing */
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long SB; /* short banner instead of normal header */
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long SC; /* suppress multiple copies */
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char *SD; /* spool directory */
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long SF; /* suppress FF on each print job */
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long SH; /* suppress header page */
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char *ST; /* status file name */
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char *TF; /* name of troff filter (per job) */
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char *TR; /* trailer string to be output when Q empties */
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char *VF; /* name of vplot filter (per job) */
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char line[BUFSIZ];
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int remote; /* true if sending files to a remote host */
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static int compar(const void *, const void *);
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/*
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* Create a TCP connection to host "rhost" at port "rport".
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* If rport == 0, then use the printer service port.
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* Most of this code comes from rcmd.c.
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*/
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int
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getport(char *rhost, int rport)
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{
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struct addrinfo hints, *res, *r;
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u_int timo = 1;
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int s, lport = IPPORT_RESERVED - 1;
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int error;
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int refuse, trial;
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char pbuf[NI_MAXSERV];
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/*
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* Get the host address and port number to connect to.
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*/
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if (rhost == NULL)
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fatal("no remote host to connect to");
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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if (rport)
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snprintf(pbuf, sizeof(pbuf), "%d", rport);
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else
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snprintf(pbuf, sizeof(pbuf), "printer");
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siginterrupt(SIGINT, 1);
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error = getaddrinfo(rhost, pbuf, &hints, &res);
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siginterrupt(SIGINT, 0);
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if (error)
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fatal("printer/tcp: %s", gai_strerror(error));
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/*
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* Try connecting to the server.
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*/
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retry:
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s = -1;
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refuse = trial = 0;
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for (r = res; r; r = r->ai_next) {
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trial++;
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retryport:
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PRIV_START;
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s = rresvport_af(&lport, r->ai_family);
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PRIV_END;
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if (s < 0) {
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/* fall back to non-privileged port */
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if (errno != EACCES ||
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(s = socket(r->ai_family, SOCK_STREAM, 0)) < 0) {
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freeaddrinfo(res);
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return(-1);
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}
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}
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siginterrupt(SIGINT, 1);
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if (connect(s, r->ai_addr, r->ai_addrlen) < 0) {
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error = errno;
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siginterrupt(SIGINT, 0);
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(void)close(s);
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s = -1;
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errno = error;
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if (errno == EADDRINUSE) {
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lport--;
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goto retryport;
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} else if (errno == ECONNREFUSED)
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refuse++;
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continue;
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} else {
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siginterrupt(SIGINT, 0);
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break;
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}
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}
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if (s < 0 && trial == refuse && timo <= 16) {
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sleep(timo);
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timo *= 2;
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goto retry;
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}
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if (res)
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freeaddrinfo(res);
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/* Don't worry if we get an error from setsockopt(). */
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trial = 1;
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setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &trial, sizeof(trial));
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return(s);
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}
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/*
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* Getline reads a line from the control file cfp, removes tabs, converts
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* new-line to null and leaves it in line.
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* Returns 0 at EOF or the number of characters read.
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*/
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int
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get_line(FILE *cfp)
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{
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int linel = 0;
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char *lp = line;
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int c;
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while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) {
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if (c == EOF)
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return(0);
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if (c == '\t') {
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do {
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*lp++ = ' ';
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linel++;
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} while ((linel & 07) != 0 && linel+1 < sizeof(line));
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continue;
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}
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*lp++ = c;
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linel++;
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}
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*lp++ = '\0';
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return(linel);
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}
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/*
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* Scan the current directory and make a list of daemon files sorted by
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* creation time.
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* Return the number of entries and a pointer to the list.
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*/
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int
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getq(struct queue ***namelist)
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{
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struct dirent *d;
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struct queue *q, **queue = NULL;
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size_t nitems = 0, arraysz;
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struct stat stbuf;
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DIR *dirp;
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PRIV_START;
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dirp = opendir(SD);
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PRIV_END;
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if (dirp == NULL)
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return(-1);
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if (fstat(dirfd(dirp), &stbuf) < 0)
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goto errdone;
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/*
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* Estimate the array size by taking the size of the directory file
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* and dividing it by a multiple of the minimum size entry.
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*/
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arraysz = (stbuf.st_size / 24);
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queue = calloc(arraysz, sizeof(struct queue *));
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if (queue == NULL)
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goto errdone;
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while ((d = readdir(dirp)) != NULL) {
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if (d->d_name[0] != 'c' || d->d_name[1] != 'f')
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continue; /* daemon control files only */
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PRIV_START;
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if (stat(d->d_name, &stbuf) < 0) {
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PRIV_END;
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continue; /* Doesn't exist */
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}
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PRIV_END;
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q = malloc(sizeof(struct queue));
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if (q == NULL)
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goto errdone;
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q->q_time = stbuf.st_mtime;
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strlcpy(q->q_name, d->d_name, sizeof(q->q_name));
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/*
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* Check to make sure the array has space left and
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* realloc the maximum size.
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*/
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if (nitems == arraysz) {
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struct queue **newqueue;
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newqueue = reallocarray(queue,
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arraysz, 2 * sizeof(struct queue *));
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if (newqueue == NULL) {
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free(q);
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goto errdone;
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}
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arraysz *= 2;
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queue = newqueue;
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}
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queue[nitems++] = q;
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}
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closedir(dirp);
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if (nitems)
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qsort(queue, nitems, sizeof(struct queue *), compar);
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*namelist = queue;
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return(nitems);
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errdone:
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if (queue != NULL) {
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while (nitems--)
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free(queue[nitems]);
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free(queue);
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}
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closedir(dirp);
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return(-1);
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}
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/*
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* Compare modification times.
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*/
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static int
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compar(const void *v1, const void *v2)
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{
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struct queue *p1 = *(struct queue **)v1;
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struct queue *p2 = *(struct queue **)v2;
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return(p1->q_time - p2->q_time);
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}
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/*
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* Figure out whether the local machine is the same
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* as the remote machine (RM) entry (if it exists).
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*/
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char *
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checkremote(void)
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{
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char lname[NI_MAXHOST], rname[NI_MAXHOST];
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struct addrinfo hints, *res, *res0;
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static char errbuf[128];
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int error;
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struct ifaddrs *ifap, *ifa;
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const int niflags = NI_NUMERICHOST;
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struct sockaddr *sa;
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#ifdef __KAME__
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struct sockaddr_in6 sin6;
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struct sockaddr_in6 *sin6p;
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#endif
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remote = 0; /* assume printer is local on failure */
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if (RM == NULL || *RM == '\0')
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return NULL;
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/* get the local interface addresses */
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siginterrupt(SIGINT, 1);
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if (getifaddrs(&ifap) < 0) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"unable to get local interface address: %s",
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strerror(errno));
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siginterrupt(SIGINT, 0);
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return errbuf;
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}
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siginterrupt(SIGINT, 0);
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/* get the remote host addresses (RM) */
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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res = NULL;
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siginterrupt(SIGINT, 1);
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error = getaddrinfo(RM, NULL, &hints, &res0);
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siginterrupt(SIGINT, 0);
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if (error) {
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(void)snprintf(errbuf, sizeof(errbuf),
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"unable to resolve remote machine %s: %s",
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RM, gai_strerror(error));
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freeifaddrs(ifap);
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return errbuf;
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}
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remote = 1; /* assume printer is remote */
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for (res = res0; res; res = res->ai_next) {
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siginterrupt(SIGINT, 1);
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error = getnameinfo(res->ai_addr, res->ai_addrlen,
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rname, sizeof(rname), NULL, 0, niflags);
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siginterrupt(SIGINT, 0);
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if (error != 0)
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continue;
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
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sa = ifa->ifa_addr;
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#ifdef __KAME__
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sin6p = (struct sockaddr_in6 *)sa;
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if (sa->sa_family == AF_INET6 &&
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sa->sa_len == sizeof(sin6) &&
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IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr) &&
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*(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]) {
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/* kame scopeid hack */
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memcpy(&sin6, ifa->ifa_addr, sizeof(sin6));
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sin6.sin6_scope_id =
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ntohs(*(u_int16_t *)&sin6p->sin6_addr.s6_addr[2]);
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sin6.sin6_addr.s6_addr[2] = 0;
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sin6.sin6_addr.s6_addr[3] = 0;
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sa = (struct sockaddr *)&sin6;
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}
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#endif
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siginterrupt(SIGINT, 1);
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error = getnameinfo(sa, sa->sa_len,
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lname, sizeof(lname), NULL, 0, niflags);
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siginterrupt(SIGINT, 0);
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if (error != 0)
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continue;
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if (strcmp(rname, lname) == 0) {
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remote = 0;
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goto done;
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}
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}
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}
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done:
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freeaddrinfo(res0);
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freeifaddrs(ifap);
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return NULL;
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}
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__dead void
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fatal(const char *msg, ...)
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{
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extern char *__progname;
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va_list ap;
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va_start(ap, msg);
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if (from != host)
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(void)printf("%s: ", host);
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(void)printf("%s: ", __progname);
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if (printer)
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(void)printf("%s: ", printer);
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(void)vprintf(msg, ap);
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va_end(ap);
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(void)putchar('\n');
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exit(1);
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}
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int
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safe_open(const char *path, int flags, mode_t mode)
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{
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int fd, serrno;
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struct stat stbuf;
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if ((fd = open(path, flags|O_NONBLOCK, mode)) < 0 ||
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fstat(fd, &stbuf) < 0) {
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if (fd >= 0) {
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serrno = errno;
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close(fd);
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errno = serrno;
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}
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return (-1);
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}
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if (!S_ISREG(stbuf.st_mode)) {
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close(fd);
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errno = EACCES;
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return (-1);
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}
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if (mode)
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(void)fchmod(fd, mode);
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return (fd);
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}
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/*
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* Make sure there's some work to do before forking off a child - lpd
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* Check to see if anything in queue - lpq
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*/
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int
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ckqueue(char *cap)
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{
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struct dirent *d;
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DIR *dirp;
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char *spooldir;
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if (cgetstr(cap, "sd", &spooldir) >= 0) {
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dirp = opendir(spooldir);
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free(spooldir);
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} else
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dirp = opendir(_PATH_DEFSPOOL);
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if (dirp == NULL)
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return (-1);
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while ((d = readdir(dirp)) != NULL) {
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if (d->d_name[0] == 'c' && d->d_name[1] == 'f') {
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closedir(dirp);
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return (1); /* found a cf file */
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}
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}
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closedir(dirp);
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return (0);
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}
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