/* $NetBSD: common.c,v 1.44 2023/05/13 11:48:19 andvar Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)common.c 8.5 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: common.c,v 1.44 2023/05/13 11:48:19 andvar Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ifaddrs.h>
#include "lp.h"
#include "lp.local.h"
#include "pathnames.h"
/*
* Routines and data common to all the line printer functions.
*/
const char *AF; /* accounting file */
long BR; /* baud rate if lp is a tty */
const char *CF; /* name of cifplot filter (per job) */
const char *DF; /* name of tex filter (per job) */
long DU; /* daeomon user-id */
long FC; /* flags to clear if lp is a tty */
const char *FF; /* form feed string */
long FS; /* flags to set if lp is a tty */
const char *GF; /* name of graph(1G) filter (per job) */
long HL; /* print header last */
const char *IF; /* name of input filter (created per job) */
const char *LF; /* log file for error messages */
const char *LO; /* lock file name */
const char *LP; /* line printer device name */
long MC; /* maximum number of copies allowed */
const char *MS; /* stty flags to set if lp is a tty */
long MX; /* maximum number of blocks to copy */
const char *NF; /* name of ditroff filter (per job) */
const char *OF; /* name of output filter (created once) */
const char *PF; /* name of postscript filter (per job) */
long PL; /* page length */
long PW; /* page width */
long PX; /* page width in pixels */
long PY; /* page length in pixels */
const char *RF; /* name of fortran text filter (per job) */
const char *RG; /* resricted group */
const char *RM; /* remote machine name */
const char *RP; /* remote printer name */
long RS; /* restricted to those with local accounts */
long RW; /* open LP for reading and writing */
long SB; /* short banner instead of normal header */
long SC; /* suppress multiple copies */
const char *SD; /* spool directory */
long SF; /* suppress FF on each print job */
long SH; /* suppress header page */
const char *ST; /* status file name */
const char *TF; /* name of troff filter (per job) */
const char *TR; /* trailer string to be output when Q empties */
const char *VF; /* name of vplot/vrast filter (per job) */
long XC; /* flags to clear for local mode */
long XS; /* flags to set for local mode */
char line[BUFSIZ];
int remote; /* true if sending files to a remote host */
extern uid_t uid, euid;
static int compar(const void *, const void *);
const char *
gethost(const char *hname)
{
const char *p = strchr(hname, '@');
return p ? ++p : hname;
}
/*
* Create a TCP connection to host "rhost". If "rhost" is of the
* form port@host, use the specified port. Otherwise use the
* default printer port. Most of this code comes from rcmd.c.
*/
int
getport(const char *rhost)
{
struct addrinfo hints, *res, *r;
u_int timo = 1;
int s, lport = IPPORT_RESERVED - 1;
int error;
int refuse, trial;
char hbuf[NI_MAXSERV], *ptr;
const char *port = "printer";
const char *hostname = rhost;
/*
* Get the host address and port number to connect to.
*/
if (rhost == NULL)
fatal("no remote host to connect to");
(void)strlcpy(hbuf, rhost, sizeof(hbuf));
for (ptr = hbuf; *ptr; ptr++)
if (*ptr == '@') {
*ptr++ = '\0';
port = hbuf;
hostname = ptr;
break;
}
(void)memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(hostname, port, &hints, &res);
if (error)
fatal("printer/tcp: %s", gai_strerror(error));
/*
* Try connecting to the server.
*/
retry:
s = -1;
refuse = trial = 0;
for (r = res; r; r = r->ai_next) {
trial++;
retryport:
seteuid(euid);
s = rresvport_af(&lport, r->ai_family);
seteuid(uid);
if (s < 0)
return(-1);
if (connect(s, r->ai_addr, r->ai_addrlen) < 0) {
error = errno;
(void)close(s);
s = -1;
errno = error;
if (errno == EADDRINUSE) {
lport--;
goto retryport;
} else if (errno == ECONNREFUSED)
refuse++;
continue;
} else
break;
}
if (s < 0 && trial == refuse && timo <= 16) {
sleep(timo);
timo *= 2;
goto retry;
}
if (res)
freeaddrinfo(res);
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.
*/
size_t
get_line(FILE *cfp)
{
size_t linel = 0;
int c;
char *lp = line;
while ((c = getc(cfp)) != '\n' && linel+1<sizeof(line)) {
if (c == EOF)
return(0);
if (c == '\t') {
do {
*lp++ = ' ';
linel++;
} while ((linel & 07) != 0 && linel+1 < sizeof(line));
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.
*/
int
getq(struct queue **namelist[])
{
struct dirent *d;
struct queue *q, **queue = NULL, **nqueue;
struct stat stbuf;
DIR *dirp;
u_int nitems = 0, arraysz;
seteuid(euid);
dirp = opendir(SD);
seteuid(uid);
if (dirp == 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 = (int)(stbuf.st_size / 24);
queue = calloc(arraysz, sizeof(struct queue *));
if (queue == NULL)
goto errdone;
while ((d = readdir(dirp)) != NULL) {
if (d->d_name[0] != 'c' || d->d_name[1] != 'f'
|| d->d_name[2] == '\0')
continue; /* daemon control files only */
seteuid(euid);
if (stat(d->d_name, &stbuf) < 0) {
seteuid(uid);
continue; /* Doesn't exist */
}
seteuid(uid);
q = (struct queue *)malloc(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); /* XXX: strcpy is safe */
/*
* Check to make sure the array has space left and
* realloc the maximum size.
*/
if (++nitems > arraysz) {
nqueue = (struct queue **)realloc(queue,
arraysz * 2 * sizeof(struct queue *));
if (nqueue == NULL) {
free(q);
goto errdone;
}
(void)memset(&nqueue[arraysz], 0,
arraysz * sizeof(nqueue[0]));
queue = nqueue;
arraysz *= 2;
}
queue[nitems-1] = q;
}
closedir(dirp);
if (nitems)
qsort(queue, nitems, sizeof(struct queue *), compar);
*namelist = queue;
return(nitems);
errdone:
freeq(queue, nitems);
closedir(dirp);
return(-1);
}
void
freeq(struct queue **namelist, u_int nitems)
{
u_int i;
if (namelist == NULL)
return;
for (i = 0; i < nitems; i++)
if (namelist[i])
free(namelist[i]);
free(namelist);
}
/*
* Compare modification times.
*/
static int
compar(const void *p1, const void *p2)
{
const struct queue *const *q1 = p1;
const struct queue *const *q2 = p2;
int j1, j2;
if ((*q1)->q_time < (*q2)->q_time)
return -1;
if ((*q1)->q_time > (*q2)->q_time)
return 1;
j1 = atoi((*q1)->q_name+3);
j2 = atoi((*q2)->q_name+3);
if (j1 == j2)
return 0;
if ((j1 < j2 && j2-j1 < 500) || (j1 > j2 && j1-j2 > 500))
return -1;
if ((j1 < j2 && j2-j1 > 500) || (j1 > j2 && j1-j2 < 500))
return 1;
return 0;
}
/*
* Figure out whether the local machine is the same
* as the remote machine (RM) entry (if it exists).
*/
const char *
checkremote(void)
{
struct addrinfo hints, *res0;
static char errbuf[128];
int error;
struct ifaddrs *ifap;
#if defined(INET6) && defined(__KAME__)
char lname[NI_MAXHOST], rname[NI_MAXHOST];
struct addrinfo *res;
struct ifaddrs *ifa;
const int niflags = NI_NUMERICHOST;
struct sockaddr_in6 sin6;
struct sockaddr_in6 *sin6p;
#endif
remote = 0; /* assume printer is local on failure */
if (RM == NULL)
return NULL;
/* get the local interface addresses */
if (getifaddrs(&ifap) < 0) {
(void)snprintf(errbuf, sizeof(errbuf),
"unable to get local interface address: %s",
strerror(errno));
return errbuf;
}
/* get the remote host addresses (RM) */
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(gethost(RM), NULL, &hints, &res0);
if (error) {
(void)snprintf(errbuf, sizeof(errbuf),
"unable to resolve remote machine %s: %s",
RM, gai_strerror(error));
freeifaddrs(ifap);
return errbuf;
}
remote = 1; /* assume printer is remote */
#if defined(INET6) && defined(__KAME__)
for (res = res0; res; res = res->ai_next) {
if (getnameinfo(res->ai_addr, res->ai_addrlen,
rname, sizeof(rname), NULL, 0, niflags) != 0)
continue;
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
sin6p = (struct sockaddr_in6 *)ifa->ifa_addr;
if (ifa->ifa_addr->sa_family == AF_INET6 &&
ifa->ifa_addr->sa_len == sizeof(sin6)) {
inet6_getscopeid(sin6p, 3);
if (getnameinfo((struct sockaddr *)&sin6,
sin6.sin6_len, lname, sizeof(lname),
NULL, 0, niflags) != 0)
continue;
if (strcmp(rname, lname) == 0) {
remote = 0;
goto done;
}
}
}
}
done:
#endif
freeaddrinfo(res0);
freeifaddrs(ifap);
return NULL;
}
/* sleep n milliseconds */
void
delay(int n)
{
struct timespec tdelay;
if (n <= 0 || n > 10000)
fatal("unreasonable delay period (%d)", n);
tdelay.tv_sec = n / 1000;
tdelay.tv_nsec = (n % 1000) * 1000000;
nanosleep(&tdelay, NULL);
}
void
getprintcap(const char *pr)
{
char *cp;
const char *dp;
int i;
if ((i = cgetent(&bp, printcapdb, pr)) == -2)
fatal("can't open printer description file");
else if (i == -1)
fatal("unknown printer: %s", pr);
else if (i == -3)
fatal("potential reference loop detected in printcap file");
LP = cgetstr(bp, DEFLP, &cp) == -1 ? _PATH_DEFDEVLP : cp;
RP = cgetstr(bp, "rp", &cp) == -1 ? DEFLP : cp;
SD = cgetstr(bp, "sd", &cp) == -1 ? _PATH_DEFSPOOL : cp;
LO = cgetstr(bp, "lo", &cp) == -1 ? DEFLOCK : cp;
ST = cgetstr(bp, "st", &cp) == -1 ? DEFSTAT : cp;
RM = cgetstr(bp, "rm", &cp) == -1 ? NULL : cp;
if ((dp = checkremote()) != NULL)
printf("Warning: %s\n", dp);
LF = cgetstr(bp, "lf", &cp) == -1 ? _PATH_CONSOLE : cp;
}
/*
* Make sure there's some work to do before forking off a child
*/
int
ckqueue(char *cap)
{
struct dirent *d;
DIR *dirp;
const char *spooldir;
char *sd = NULL;
int rv = 0;
spooldir = cgetstr(cap, "sd", &sd) == -1 ? _PATH_DEFSPOOL : sd;
if ((dirp = opendir(spooldir)) == NULL) {
rv = -1;
goto out;
}
while ((d = readdir(dirp)) != NULL) {
if (d->d_name[0] != 'c' || d->d_name[1] != 'f')
continue; /* daemon control files only */
rv = 1;
break;
}
out:
if (dirp != NULL)
closedir(dirp);
if (spooldir != sd)
free(sd);
return (rv);
}
