| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * bare bones version of lpr & lpq: BSD printing utilities
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| 4 | *
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| 5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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| 6 | *
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| 7 | * Original idea and code:
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| 8 | * Walter Harms <WHarms@bfs.de>
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| 9 | *
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| 10 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 11 | *
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| 12 | * See RFC 1179 for protocol description.
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| 13 | */
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| 14 | //config:config LPR
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| 15 | //config: bool "lpr"
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| 16 | //config: default y
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| 17 | //config: help
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| 18 | //config: lpr sends files (or standard input) to a print spooling daemon.
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| 19 | //config:
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| 20 | //config:config LPQ
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| 21 | //config: bool "lpq"
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| 22 | //config: default y
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| 23 | //config: help
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| 24 | //config: lpq is a print spool queue examination and manipulation program.
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| 25 |
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| 26 | //applet:IF_LPQ(APPLET_ODDNAME(lpq, lpqr, BB_DIR_USR_BIN, BB_SUID_DROP, lpq))
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| 27 | //applet:IF_LPR(APPLET_ODDNAME(lpr, lpqr, BB_DIR_USR_BIN, BB_SUID_DROP, lpr))
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| 28 |
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| 29 | //kbuild:lib-$(CONFIG_LPR) += lpr.o
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| 30 | //kbuild:lib-$(CONFIG_LPQ) += lpr.o
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| 31 |
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| 32 | //usage:#define lpr_trivial_usage
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| 33 | //usage: "-P queue[@host[:port]] -U USERNAME -J TITLE -Vmh [FILE]..."
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| 34 | /* -C CLASS exists too, not shown.
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| 35 | * CLASS is supposed to be printed on banner page, if one is requested */
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| 36 | //usage:#define lpr_full_usage "\n\n"
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| 37 | //usage: " -P lp service to connect to (else uses $PRINTER)"
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| 38 | //usage: "\n -m Send mail on completion"
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| 39 | //usage: "\n -h Print banner page too"
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| 40 | //usage: "\n -V Verbose"
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| 41 | //usage:
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| 42 | //usage:#define lpq_trivial_usage
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| 43 | //usage: "[-P queue[@host[:port]]] [-U USERNAME] [-d JOBID]... [-fs]"
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| 44 | //usage:#define lpq_full_usage "\n\n"
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| 45 | //usage: " -P lp service to connect to (else uses $PRINTER)"
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| 46 | //usage: "\n -d Delete jobs"
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| 47 | //usage: "\n -f Force any waiting job to be printed"
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| 48 | //usage: "\n -s Short display"
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| 49 |
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| 50 | #include "libbb.h"
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| 51 |
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| 52 | /*
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| 53 | * LPD returns binary 0 on success.
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| 54 | * Otherwise it returns error message.
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| 55 | */
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| 56 | static void get_response_or_say_and_die(int fd, const char *errmsg)
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| 57 | {
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| 58 | ssize_t sz;
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| 59 | char buf[128];
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| 60 |
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| 61 | buf[0] = ' ';
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| 62 | sz = safe_read(fd, buf, 1);
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| 63 | if ('\0' != buf[0]) {
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| 64 | // request has failed
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| 65 | // try to make sure last char is '\n', but do not add
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| 66 | // superfluous one
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| 67 | sz = full_read(fd, buf + 1, 126);
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| 68 | bb_error_msg("error while %s%s", errmsg,
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| 69 | (sz > 0 ? ". Server said:" : ""));
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| 70 | if (sz > 0) {
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| 71 | // sz = (bytes in buf) - 1
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| 72 | if (buf[sz] != '\n')
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| 73 | buf[++sz] = '\n';
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| 74 | safe_write(STDERR_FILENO, buf, sz + 1);
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| 75 | }
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| 76 | xfunc_die();
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| 77 | }
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| 78 | }
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| 79 |
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| 80 | int lpqr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
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| 81 | int lpqr_main(int argc UNUSED_PARAM, char *argv[])
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| 82 | {
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| 83 | enum {
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| 84 | OPT_P = 1 << 0, // -P queue[@host[:port]]. If no -P is given use $PRINTER, then "lp@localhost:515"
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| 85 | OPT_U = 1 << 1, // -U username
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| 86 |
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| 87 | LPR_V = 1 << 2, // -V: be verbose
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| 88 | LPR_h = 1 << 3, // -h: want banner printed
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| 89 | LPR_C = 1 << 4, // -C class: job "class" (? supposedly printed on banner)
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| 90 | LPR_J = 1 << 5, // -J title: the job title for the banner page
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| 91 | LPR_m = 1 << 6, // -m: send mail back to user
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| 92 |
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| 93 | LPQ_SHORT_FMT = 1 << 2, // -s: short listing format
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| 94 | LPQ_DELETE = 1 << 3, // -d: delete job(s)
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| 95 | LPQ_FORCE = 1 << 4, // -f: force waiting job(s) to be printed
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| 96 | };
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| 97 | char tempfile[sizeof("/tmp/lprXXXXXX")];
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| 98 | const char *job_title;
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| 99 | const char *printer_class = ""; // printer class, max 32 char
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| 100 | const char *queue; // name of printer queue
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| 101 | const char *server = "localhost"; // server[:port] of printer queue
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| 102 | char *hostname;
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| 103 | // N.B. IMHO getenv("USER") can be way easily spoofed!
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| 104 | const char *user = xuid2uname(getuid());
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| 105 | unsigned job;
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| 106 | unsigned opts;
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| 107 | int fd;
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| 108 |
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| 109 | queue = getenv("PRINTER");
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| 110 | if (!queue)
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| 111 | queue = "lp";
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| 112 |
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| 113 | // parse options
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| 114 | // TODO: set opt_complementary: s,d,f are mutually exclusive
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| 115 | opts = getopt32(argv,
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| 116 | (/*lp*/'r' == applet_name[2]) ? "P:U:VhC:J:m" : "P:U:sdf"
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| 117 | , &queue, &user
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| 118 | , &printer_class, &job_title
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| 119 | );
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| 120 | argv += optind;
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| 121 |
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| 122 | {
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| 123 | // queue name is to the left of '@'
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| 124 | char *s = strchr(queue, '@');
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| 125 | if (s) {
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| 126 | // server name is to the right of '@'
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| 127 | *s = '\0';
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| 128 | server = s + 1;
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| 129 | }
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| 130 | }
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| 131 |
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| 132 | // do connect
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| 133 | fd = create_and_connect_stream_or_die(server, 515);
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| 134 |
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| 135 | //
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| 136 | // LPQ ------------------------
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| 137 | //
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| 138 | if (/*lp*/'q' == applet_name[2]) {
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| 139 | char cmd;
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| 140 | // force printing of every job still in queue
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| 141 | if (opts & LPQ_FORCE) {
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| 142 | cmd = 1;
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| 143 | goto command;
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| 144 | // delete job(s)
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| 145 | } else if (opts & LPQ_DELETE) {
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| 146 | fdprintf(fd, "\x5" "%s %s", queue, user);
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| 147 | while (*argv) {
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| 148 | fdprintf(fd, " %s", *argv++);
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| 149 | }
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| 150 | bb_putchar('\n');
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| 151 | // dump current jobs status
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| 152 | // N.B. periodical polling should be achieved
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| 153 | // via "watch -n delay lpq"
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| 154 | // They say it's the UNIX-way :)
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| 155 | } else {
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| 156 | cmd = (opts & LPQ_SHORT_FMT) ? 3 : 4;
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| 157 | command:
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| 158 | fdprintf(fd, "%c" "%s\n", cmd, queue);
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| 159 | bb_copyfd_eof(fd, STDOUT_FILENO);
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| 160 | }
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| 161 |
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| 162 | return EXIT_SUCCESS;
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| 163 | }
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| 164 |
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| 165 | //
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| 166 | // LPR ------------------------
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| 167 | //
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| 168 | if (opts & LPR_V)
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| 169 | bb_error_msg("connected to server");
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| 170 |
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| 171 | job = getpid() % 1000;
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| 172 | hostname = safe_gethostname();
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| 173 |
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| 174 | // no files given on command line? -> use stdin
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| 175 | if (!*argv)
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| 176 | *--argv = (char *)"-";
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| 177 |
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| 178 | fdprintf(fd, "\x2" "%s\n", queue);
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| 179 | get_response_or_say_and_die(fd, "setting queue");
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| 180 |
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| 181 | // process files
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| 182 | do {
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| 183 | unsigned cflen;
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| 184 | int dfd;
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| 185 | struct stat st;
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| 186 | char *c;
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| 187 | char *remote_filename;
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| 188 | char *controlfile;
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| 189 |
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| 190 | // if data file is stdin, we need to dump it first
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| 191 | if (LONE_DASH(*argv)) {
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| 192 | strcpy(tempfile, "/tmp/lprXXXXXX");
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| 193 | dfd = xmkstemp(tempfile);
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| 194 | bb_copyfd_eof(STDIN_FILENO, dfd);
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| 195 | xlseek(dfd, 0, SEEK_SET);
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| 196 | *argv = (char*)bb_msg_standard_input;
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| 197 | } else {
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| 198 | dfd = xopen(*argv, O_RDONLY);
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| 199 | }
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| 200 |
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| 201 | st.st_size = 0; /* paranoia: fstat may theoretically fail */
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| 202 | fstat(dfd, &st);
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| 203 |
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| 204 | /* Apparently, some servers are buggy and won't accept 0-sized jobs.
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| 205 | * Standard lpr works around it by refusing to send such jobs:
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| 206 | */
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| 207 | if (st.st_size == 0) {
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| 208 | bb_error_msg("nothing to print");
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| 209 | continue;
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| 210 | }
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| 211 |
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| 212 | /* "The name ... should start with ASCII "cfA",
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| 213 | * followed by a three digit job number, followed
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| 214 | * by the host name which has constructed the file."
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| 215 | * We supply 'c' or 'd' as needed for control/data file. */
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| 216 | remote_filename = xasprintf("fA%03u%s", job, hostname);
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| 217 |
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| 218 | // create control file
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| 219 | // TODO: all lines but 2 last are constants! How we can use this fact?
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| 220 | controlfile = xasprintf(
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| 221 | "H" "%.32s\n" "P" "%.32s\n" /* H HOST, P USER */
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| 222 | "C" "%.32s\n" /* C CLASS - printed on banner page (if L cmd is also given) */
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| 223 | "J" "%.99s\n" /* J JOBNAME */
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| 224 | /* "class name for banner page and job name
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| 225 | * for banner page commands must precede L command" */
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| 226 | "L" "%.32s\n" /* L USER - print banner page, with given user's name */
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| 227 | "M" "%.32s\n" /* M WHOM_TO_MAIL */
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| 228 | "l" "d%.31s\n" /* l DATA_FILE_NAME ("dfAxxx") */
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| 229 | , hostname, user
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| 230 | , printer_class /* can be "" */
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| 231 | , ((opts & LPR_J) ? job_title : *argv)
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| 232 | , (opts & LPR_h) ? user : ""
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| 233 | , (opts & LPR_m) ? user : ""
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| 234 | , remote_filename
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| 235 | );
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| 236 | // delete possible "\nX\n" (that is, one-char) patterns
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| 237 | c = controlfile;
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| 238 | while ((c = strchr(c, '\n')) != NULL) {
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| 239 | if (c[1] && c[2] == '\n') {
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| 240 | overlapping_strcpy(c, c+2);
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| 241 | } else {
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| 242 | c++;
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| 243 | }
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| 244 | }
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| 245 |
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| 246 | // send control file
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| 247 | if (opts & LPR_V)
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| 248 | bb_error_msg("sending control file");
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| 249 | /* "Acknowledgement processing must occur as usual
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| 250 | * after the command is sent." */
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| 251 | cflen = (unsigned)strlen(controlfile);
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| 252 | fdprintf(fd, "\x2" "%u c%s\n", cflen, remote_filename);
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| 253 | get_response_or_say_and_die(fd, "sending control file");
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| 254 | /* "Once all of the contents have
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| 255 | * been delivered, an octet of zero bits is sent as
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| 256 | * an indication that the file being sent is complete.
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| 257 | * A second level of acknowledgement processing
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| 258 | * must occur at this point." */
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| 259 | full_write(fd, controlfile, cflen + 1); /* writes NUL byte too */
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| 260 | get_response_or_say_and_die(fd, "sending control file");
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| 261 |
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| 262 | // send data file, with name "dfaXXX"
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| 263 | if (opts & LPR_V)
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| 264 | bb_error_msg("sending data file");
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| 265 | fdprintf(fd, "\x3" "%"OFF_FMT"u d%s\n", st.st_size, remote_filename);
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| 266 | get_response_or_say_and_die(fd, "sending data file");
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| 267 | if (bb_copyfd_size(dfd, fd, st.st_size) != st.st_size) {
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| 268 | // We're screwed. We sent less bytes than we advertised.
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| 269 | bb_error_msg_and_die("local file changed size?!");
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| 270 | }
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| 271 | write(fd, "", 1); // send ACK
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| 272 | get_response_or_say_and_die(fd, "sending data file");
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| 273 |
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| 274 | // delete temporary file if we dumped stdin
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| 275 | if (*argv == (char*)bb_msg_standard_input)
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| 276 | unlink(tempfile);
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| 277 |
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| 278 | // cleanup
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| 279 | close(fd);
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| 280 | free(remote_filename);
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| 281 | free(controlfile);
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| 282 |
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| 283 | // say job accepted
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| 284 | if (opts & LPR_V)
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| 285 | bb_error_msg("job accepted");
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| 286 |
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| 287 | // next, please!
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| 288 | job = (job + 1) % 1000;
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| 289 | } while (*++argv);
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| 290 |
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| 291 | return EXIT_SUCCESS;
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| 292 | }
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