252 lines
7.0 KiB
C
252 lines
7.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* bare bones version of lpr & lpq: BSD printing utilities
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*
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* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* Original idea and code:
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* Walter Harms <WHarms@bfs.de>
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*
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* See RFC 1179 for protocol description.
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*/
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#include "libbb.h"
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/*
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* LPD returns binary 0 on success.
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* Otherwise it returns error message.
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*/
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static void get_response_or_say_and_die(const char *errmsg)
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{
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ssize_t sz;
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char buf[128];
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fflush(stdout);
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buf[0] = ' ';
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sz = safe_read(STDOUT_FILENO, buf, 1);
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if ('\0' != buf[0]) {
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// request has failed
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// try to make sure last char is '\n', but do not add
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// superfluous one
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sz = full_read(STDOUT_FILENO, buf + 1, 126);
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bb_error_msg("error while %s%s", errmsg,
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(sz > 0 ? ". Server said:" : ""));
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if (sz > 0) {
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// sz = (bytes in buf) - 1
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if (buf[sz] != '\n')
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buf[++sz] = '\n';
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safe_write(STDERR_FILENO, buf, sz + 1);
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}
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xfunc_die();
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}
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}
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int lpqr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
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int lpqr_main(int argc, char *argv[])
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{
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enum {
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OPT_P = 1 << 0, // -P queue[@host[:port]]. If no -P is given use $PRINTER, then "lp@localhost:515"
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OPT_U = 1 << 1, // -U username
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LPR_V = 1 << 2, // -V: be verbose
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LPR_h = 1 << 3, // -h: want banner printed
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LPR_C = 1 << 4, // -C class: job "class" (? supposedly printed on banner)
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LPR_J = 1 << 5, // -J title: the job title for the banner page
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LPR_m = 1 << 6, // -m: send mail back to user
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LPQ_SHORT_FMT = 1 << 2, // -s: short listing format
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LPQ_DELETE = 1 << 3, // -d: delete job(s)
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LPQ_FORCE = 1 << 4, // -f: force waiting job(s) to be printed
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};
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char tempfile[sizeof("/tmp/lprXXXXXX")];
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const char *job_title;
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const char *printer_class = ""; // printer class, max 32 char
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const char *queue; // name of printer queue
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const char *server = "localhost"; // server[:port] of printer queue
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char *hostname;
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// N.B. IMHO getenv("USER") can be way easily spoofed!
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const char *user = bb_getpwuid(NULL, -1, getuid());
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unsigned job;
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unsigned opts;
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int old_stdout, fd;
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// parse options
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// TODO: set opt_complementary: s,d,f are mutually exclusive
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opts = getopt32(argv,
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(/*lp*/'r' == applet_name[2]) ? "P:U:VhC:J:m" : "P:U:sdf"
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, &queue, &user
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, &printer_class, &job_title
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);
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argv += optind;
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// if queue is not specified -> use $PRINTER
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if (!(opts & OPT_P))
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queue = getenv("PRINTER");
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// if queue is still not specified ->
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if (!queue) {
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// ... queue defaults to "lp"
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// server defaults to "localhost"
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queue = "lp";
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// if queue is specified ->
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} else {
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// queue name is to the left of '@'
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char *s = strchr(queue, '@');
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if (s) {
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// server name is to the right of '@'
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*s = '\0';
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server = s + 1;
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}
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}
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// do connect
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fd = create_and_connect_stream_or_die(server, 515);
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// play with descriptors to save space: fdprintf > printf
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old_stdout = dup(STDOUT_FILENO);
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xmove_fd(fd, STDOUT_FILENO);
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//
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// LPQ ------------------------
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//
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if (/*lp*/'q' == applet_name[2]) {
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char cmd;
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// force printing of every job still in queue
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if (opts & LPQ_FORCE) {
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cmd = 1;
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goto command;
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// delete job(s)
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} else if (opts & LPQ_DELETE) {
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printf("\x5" "%s %s", queue, user);
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while (*argv) {
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printf(" %s", *argv++);
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}
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bb_putchar('\n');
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// dump current jobs status
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// N.B. periodical polling should be achieved
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// via "watch -n delay lpq"
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// They say it's the UNIX-way :)
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} else {
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cmd = (opts & LPQ_SHORT_FMT) ? 3 : 4;
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command:
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printf("%c" "%s\n", cmd, queue);
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fflush(stdout);
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bb_copyfd_eof(STDOUT_FILENO, old_stdout);
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}
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return EXIT_SUCCESS;
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}
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//
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// LPR ------------------------
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//
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if (opts & LPR_V)
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bb_error_msg("connected to server");
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job = getpid() % 1000;
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// TODO: when do finally we invent char *xgethostname()?!!
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hostname = xzalloc(MAXHOSTNAMELEN+1);
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gethostname(hostname, MAXHOSTNAMELEN);
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// no files given on command line? -> use stdin
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if (!*argv)
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*--argv = (char *)"-";
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printf("\x2" "%s\n", queue);
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get_response_or_say_and_die("setting queue");
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// process files
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do {
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struct stat st;
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char *c;
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char *remote_filename;
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char *controlfile;
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// if data file is stdin, we need to dump it first
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if (LONE_DASH(*argv)) {
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strcpy(tempfile, "/tmp/lprXXXXXX");
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fd = mkstemp(tempfile);
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if (fd < 0)
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bb_perror_msg_and_die("mkstemp");
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bb_copyfd_eof(STDIN_FILENO, fd);
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xlseek(fd, 0, SEEK_SET);
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*argv = (char*)bb_msg_standard_input;
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} else {
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fd = xopen(*argv, O_RDONLY);
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}
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/* "The name ... should start with ASCII "cfA",
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* followed by a three digit job number, followed
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* by the host name which has constructed the file."
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* We supply 'c' or 'd' as needed for control/data file. */
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remote_filename = xasprintf("fA%03u%s", job, hostname);
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// create control file
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// TODO: all lines but 2 last are constants! How we can use this fact?
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controlfile = xasprintf(
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"H" "%.32s\n" "P" "%.32s\n" /* H HOST, P USER */
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"C" "%.32s\n" /* C CLASS - printed on banner page (if L cmd is also given) */
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"J" "%.99s\n" /* J JOBNAME */
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/* "class name for banner page and job name
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* for banner page commands must precede L command" */
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"L" "%.32s\n" /* L USER - print banner page, with given user's name */
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"M" "%.32s\n" /* M WHOM_TO_MAIL */
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"l" "d%.31s\n" /* l DATA_FILE_NAME ("dfAxxx") */
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, hostname, user
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, printer_class /* can be "" */
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, ((opts & LPR_J) ? job_title : *argv)
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, (opts & LPR_h) ? user : ""
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, (opts & LPR_m) ? user : ""
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, remote_filename
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);
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// delete possible "\nX\n" patterns
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c = controlfile;
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while ((c = strchr(c, '\n')) != NULL) {
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c++;
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while (c[0] && c[1] == '\n')
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memmove(c, c+2, strlen(c+1)); /* strlen(c+1) == strlen(c+2) + 1 */
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}
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// send control file
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if (opts & LPR_V)
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bb_error_msg("sending control file");
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/* "Once all of the contents have
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* been delivered, an octet of zero bits is sent as
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* an indication that the file being sent is complete.
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* A second level of acknowledgement processing
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* must occur at this point." */
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printf("\x2" "%u c%s\n" "%s" "%c",
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(unsigned)strlen(controlfile),
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remote_filename, controlfile, '\0');
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get_response_or_say_and_die("sending control file");
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// send data file, with name "dfaXXX"
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if (opts & LPR_V)
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bb_error_msg("sending data file");
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st.st_size = 0; /* paranoia: fstat may theoretically fail */
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fstat(fd, &st);
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printf("\x3" "%"OFF_FMT"u d%s\n", st.st_size, remote_filename);
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fflush(stdout);
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if (bb_copyfd_size(fd, STDOUT_FILENO, st.st_size) != st.st_size) {
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// We're screwed. We sent less bytes than we advertised.
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bb_error_msg_and_die("local file changed size?!");
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}
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bb_putchar('\0');
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get_response_or_say_and_die("sending data file");
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// delete temporary file if we dumped stdin
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if (*argv == (char*)bb_msg_standard_input)
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unlink(tempfile);
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// cleanup
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close(fd);
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free(remote_filename);
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free(controlfile);
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// next, please!
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job = (job + 1) % 1000;
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} while (*++argv);
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return EXIT_SUCCESS;
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}
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