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/* vi: set sw=4 ts=4: */
/*
* Copyright 2008 Walter Harms (WHarms@bfs.de)
*
* Licensed under the GPL v2, see the file LICENSE in this tarball.
*/
#include "libbb.h"
#include "lpr.h"
static char *mygethostname31(void)
{
char *s = xzalloc(32);
if (gethostname(s, 31) < 0)
bb_perror_msg_and_die("gethostname");
/* gethostname() does not guarantee NUL-termination. xzalloc does. */
return s;
}
static int xmkstemp(char *temp_name)
{
int fd;
fd = mkstemp(temp_name);
if (fd < 0)
bb_perror_msg_and_die("mkstemp");
return fd;
}
/* lpd server sends NUL byte on success.
* Else read the errormessage and exit.
*/
static void get_response(int server_sock, const char *emsg)
{
char buf = '\0';
safe_read(server_sock, &buf, 1);
if (buf != '\0') {
bb_error_msg("%s. Server said:", emsg);
fputc(buf, stderr);
logmode = 0; /* no errors from bb_copyfd_eof() */
bb_copyfd_eof(server_sock, STDERR_FILENO);
xfunc_die();
}
}
int lpr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
int lpr_main(int argc, char *argv[])
{
struct netprint netprint;
char temp_name[] = "/tmp/lprXXXXXX"; /* for mkstemp */
char *strings[5];
const char *netopt;
const char *jobtitle;
const char *hostname;
const char *jobclass;
char *username;
int pid1000;
int server_sock, tmp_fd;
unsigned opt;
enum {
VERBOSE = 1 << 0,
USE_HEADER = 1 << 1, /* -h: want banner printed */
USE_MAIL = 1 << 2, /* -m: send mail back to user */
OPT_U = 1 << 3, /* -U username */
OPT_J = 1 << 4, /* -J title: the job title for the banner page */
OPT_C = 1 << 5, /* -C class: job "class" (? supposedly printed on banner) */
OPT_P = 1 << 6, /* -P queue[@host[:port]] */
/* if no -P is given use $PRINTER, then "lp@localhost:515" */
};
/* Set defaults, parse options */
hostname = mygethostname31();
netopt = NULL;
username = getenv("LOGNAME");
if (username == NULL)
username = (char*)"user"; /* TODO: getpwuid(getuid())->pw_name? */
opt = getopt32(argv, "VhmU:J:C:P:",
&username, &jobtitle, &jobclass, &netopt);
argv += optind;
parse_prt(netopt, &netprint);
username = xstrndup(username, 31);
/* For stdin we need to save it to a tempfile,
* otherwise we can't know the size. */
tmp_fd = -1;
if (!*argv) {
if (jobtitle == NULL)
jobtitle = (char *) bb_msg_standard_input;
tmp_fd = xmkstemp(temp_name);
if (bb_copyfd_eof(STDIN_FILENO, tmp_fd) < 0)
goto del_temp_file;
/* TODO: we actually can have deferred write errors... */
close(tmp_fd);
argv--; /* back off from NULL */
*argv = temp_name;
}
if (opt & VERBOSE)
puts("connect to server");
server_sock = xconnect_stream(netprint.lsa);
/* "Receive a printer job" command */
fdprintf(server_sock, "\x2" "%s\n", netprint.queue);
get_response(server_sock, "set queue failed");
pid1000 = getpid() % 1000;
while (*argv) {
char dfa_name[sizeof("dfAnnn") + 32];
struct stat st;
char **sptr;
unsigned size;
int fd;
fd = xopen(*argv, O_RDONLY);
/* "The name ... should start with ASCII "dfA",
* followed by a three digit job number, followed
* by the host name which has constructed the file." */
snprintf(dfa_name, sizeof(dfa_name),
"dfA%03u%s", pid1000, hostname);
pid1000 = (pid1000 + 1) % 1000;
/*
* Generate control file contents
*/
/* H HOST, P USER, l DATA_FILE_NAME, J JOBNAME */
strings[0] = xasprintf("H%.32s\n" "P%.32s\n" "l%.32s\n"
"J%.99s\n",
hostname, username, dfa_name,
(opt & OPT_J) ? jobtitle : *argv);
sptr = &strings[1];
/* C CLASS - printed on banner page (if L cmd is also given) */
if (opt & OPT_C) /* [1] */
*sptr++ = xasprintf("C%.32s\n", jobclass);
/* M WHOM_TO_MAIL */
if (opt & USE_MAIL) /* [2] */
*sptr++ = xasprintf("M%.32s\n", username);
/* H USER - print banner page, with given user's name */
if (opt & USE_HEADER) /* [3] */
*sptr++ = xasprintf("L%.32s\n", username);
*sptr = NULL; /* [4] max */
/* RFC 1179: "LPR servers MUST be able
* to receive the control file subcommand first
* and SHOULD be able to receive the data file
* subcommand first".
* Ok, we'll send control file first. */
size = 0;
sptr = strings;
while (*sptr)
size += strlen(*sptr++);
if (opt & VERBOSE)
puts("send control file");
/* 2: "Receive control file" subcommand */
fdprintf(server_sock, "\x2" "%u c%s\n", size, dfa_name + 1);
sptr = strings;
while (*sptr) {
xwrite(server_sock, *sptr, strlen(*sptr));
free(*sptr);
sptr++;
}
free(strings);
/* "Once all of the contents have
* been delivered, an octet of zero bits is sent as
* an indication that the file being sent is complete.
* A second level of acknowledgement processing
* must occur at this point." */
xwrite(server_sock, "", 1);
get_response(server_sock, "send control file failed");
/* Sending data */
st.st_size = 0; /* paranoia */
fstat(fd, &st);
if (opt & VERBOSE)
puts("send data file");
/* 3: "Receive data file" subcommand */
fdprintf(server_sock, "\x3" "%"OFF_FMT"u %s\n", st.st_size, dfa_name);
/* TODO: if file shrank and we wrote less than st.st_size,
* pad output with NUL bytes? Otherwise server won't know
* that we are done. */
if (bb_copyfd_size(fd, server_sock, st.st_size) < 0)
xfunc_die();
close(fd);
xwrite(server_sock, "", 1);
get_response(server_sock, "send file failed");
argv++;
}
if (ENABLE_FEATURE_CLEAN_UP)
close(server_sock);
if (tmp_fd >= 0) {
del_temp_file:
unlink(temp_name);
}
return 0;
}
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