void
recvjob(void)
{
struct stat stb;
int status;
/*
* Perform lookup for printer name or abbreviation
*/
if ((status = cgetent(&bp, printcapdb, printer)) == -2)
frecverr("cannot open printer description file");
else if (status == -1)
frecverr("unknown printer %s", printer);
else if (status == -3)
fatal("potential reference loop detected in printcap file");
if (cgetstr(bp, "lf", &LF) == -1)
LF = _PATH_CONSOLE;
if (cgetstr(bp, "sd", &SD) == -1)
SD = _PATH_DEFSPOOL;
if (cgetstr(bp, "lo", &LO) == -1)
LO = DEFLOCK;
(void)close(2); /* set up log file */
PRIV_START;
if (open(LF, O_WRONLY|O_APPEND, 0664) < 0) {
syslog(LOG_ERR, "%s: %m", LF);
(void)open(_PATH_DEVNULL, O_WRONLY);
}
PRIV_END;
if (chdir(SD) < 0)
frecverr("%s: %s: %m", printer, SD);
if (stat(LO, &stb) == 0) {
if (stb.st_mode & 010) {
/* queue is disabled */
putchar('\1'); /* return error code */
exit(1);
}
} else if (stat(SD, &stb) < 0)
frecverr("%s: %s: %m", printer, SD);
minfree = 2 * read_number("minfree"); /* scale KB to 512 blocks */
signal(SIGTERM, rcleanup);
signal(SIGPIPE, rcleanup);
if (readjob())
printjob();
}
recvjob()
{
struct stat stb;
char *bp = pbuf;
int status, rcleanup();
/*
* Perform lookup for printer name or abbreviation
*/
if ((status = pgetent(line, printer)) < 0)
frecverr("cannot open printer description file");
else if (status == 0)
frecverr("unknown printer %s", printer);
if ((LF = pgetstr("lf", &bp)) == NULL)
LF = DEFLOGF;
if ((SD = pgetstr("sd", &bp)) == NULL)
SD = DEFSPOOL;
if ((LO = pgetstr("lo", &bp)) == NULL)
LO = DEFLOCK;
(void) close(2); /* set up log file */
if (open(LF, O_WRONLY|O_APPEND, 0664) < 0) {
syslog(LOG_ERR, "%s: %m", LF);
(void) open("/dev/null", O_WRONLY);
}
if (chdir(SD) < 0)
frecverr("%s: %s: %m", printer, SD);
if (stat(LO, &stb) == 0) {
if (stb.st_mode & 010) {
/* queue is disabled */
putchar('\1'); /* return error code */
exit(1);
}
} else if (stat(SD, &stb) < 0)
frecverr("%s: %s: %m", printer, SD);
minfree = read_number("minfree");
ddev = find_dev(stb.st_dev, S_IFBLK);
if ((dfd = open(ddev, O_RDONLY)) < 0)
syslog(LOG_WARNING, "%s: %s: %m", printer, ddev);
signal(SIGTERM, rcleanup);
signal(SIGPIPE, rcleanup);
if (readjob())
printjob();
}
/*
* Read files send by lpd and copy them to the spooling directory.
*/
static int
readfile(char *file, int size)
{
char *cp;
char buf[BUFSIZ];
int i, j, amt;
int fd, err;
if ((fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD)) < 0)
frecverr("readfile: %s: illegal path name: %m", file);
ack();
err = 0;
for (i = 0; i < size; i += BUFSIZ) {
amt = BUFSIZ;
cp = buf;
if (i + amt > size)
amt = size - i;
do {
j = read(STDOUT_FILENO, cp, amt);
if (j <= 0)
frecverr("Lost connection");
amt -= j;
cp += j;
} while (amt > 0);
amt = BUFSIZ;
if (i + amt > size)
amt = size - i;
if (write(fd, buf, amt) != amt) {
err++;
break;
}
}
(void)close(fd);
if (err)
frecverr("%s: write error", file);
if (noresponse()) { /* file sent had bad data in it */
if (strchr(file, '/') == NULL)
(void)unlink(file);
return(0);
}
ack();
return(1);
}
static int
noresponse(void)
{
char resp;
if (read(STDOUT_FILENO, &resp, 1) != 1)
frecverr("Lost connection");
if (resp == '\0')
return(0);
return(1);
}
/*
* Read printer jobs sent by lpd and copy them to the spooling directory.
* Return the number of jobs successfully transfered.
*/
static int
readjob()
{
register int size, nfiles;
register char *cp;
ack();
nfiles = 0;
for (;;) {
/*
* Read a command to tell us what to do
*/
cp = line;
do {
if ((size = read(1, cp, 1)) != 1) {
if (size < 0)
frecverr("%s: Lost connection",printer);
return(nfiles);
}
} while (*cp++ != '\n');
*--cp = '\0';
cp = line;
switch (*cp++) {
case '\1': /* cleanup because data sent was bad */
rcleanup(0);
continue;
case '\2': /* read cf file */
size = 0;
while (*cp >= '0' && *cp <= '9')
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
break;
/*
* host name has been authenticated, we use our
* view of the host name since we may be passed
* something different than what gethostbyaddr()
* returns
*/
strcpy(cp + 6, from);
strcpy(tfname, cp);
tfname[0] = 't';
if (!chksize(size)) {
(void) write(1, "\2", 1);
continue;
}
if (!readfile(tfname, size)) {
rcleanup(0);
continue;
}
if (link(tfname, cp) < 0)
frecverr("%s: %m", tfname);
(void) unlink(tfname);
tfname[0] = '\0';
nfiles++;
continue;
case '\3': /* read df file */
size = 0;
while (*cp >= '0' && *cp <= '9')
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
break;
if (!chksize(size)) {
(void) write(1, "\2", 1);
continue;
}
(void) strcpy(dfname, cp);
if (index(dfname, '/'))
frecverr("readjob: %s: illegal path name",
dfname);
(void) readfile(dfname, size);
continue;
}
frecverr("protocol screwup: %s", line);
}
}
/*
* Read printer jobs sent by lpd and copy them to the spooling directory.
* Return the number of jobs successfully transferred.
*/
static int
readjob(void)
{
int size, nfiles;
char *cp;
ack();
nfiles = 0;
for (;;) {
/*
* Read a command to tell us what to do
*/
cp = line;
do {
if ((size = read(STDOUT_FILENO, cp, 1)) != 1) {
if (size < 0)
frecverr("%s: Lost connection",
printer);
return(nfiles);
}
} while (*cp++ != '\n' && (cp - line + 1) < sizeof(line));
if (cp - line + 1 >= sizeof(line))
frecverr("readjob overflow");
*--cp = '\0';
cp = line;
switch (*cp++) {
case '\1': /* cleanup because data sent was bad */
rcleanup(0);
continue;
case '\2': /* read cf file */
size = 0;
while (*cp >= '0' && *cp <= '9')
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
break;
/*
* host name has been authenticated, we use our
* view of the host name since we may be passed
* something different than what gethostbyaddr()
* returns
*/
strlcpy(cp + 6, from, sizeof(line) + line - cp - 6);
if (strchr(cp, '/'))
frecverr("readjob: %s: illegal path name", cp);
strlcpy(tfname, cp, sizeof(tfname));
tfname[0] = 't';
if (!chksize(size)) {
(void)write(STDOUT_FILENO, "\2", 1);
continue;
}
/*
* XXX
* We blindly believe what the remote host puts
* for the path to the df file. In general this
* is OK since we don't allow paths with '/' in
* them. Still, it would be better to sanity
* check the cf file sent to us and make the
* df name match the cf name we used. That way
* we avoid any possible collisions.
*/
if (!readfile(tfname, size)) {
rcleanup(0);
continue;
}
if (link(tfname, cp) < 0)
frecverr("link %s %s: %m", tfname, cp);
(void)unlink(tfname);
tfname[0] = '\0';
nfiles++;
continue;
case '\3': /* read df file */
size = 0;
while (*cp >= '0' && *cp <= '9')
size = size * 10 + (*cp++ - '0');
if (*cp++ != ' ')
break;
if (strchr(cp, '/'))
frecverr("readjob: %s: illegal path name", cp);
if (!chksize(size)) {
(void)write(STDOUT_FILENO, "\2", 1);
continue;
}
(void)strlcpy(dfname, cp, sizeof(dfname));
(void)readfile(dfname, size);
continue;
}
frecverr("protocol screwup: %s", line);
}
}
