[2725] | 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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[3232] | 14 |
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| 15 | //usage:#define lpr_trivial_usage
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| 16 | //usage: "-P queue[@host[:port]] -U USERNAME -J TITLE -Vmh [FILE]..."
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| 17 | /* -C CLASS exists too, not shown.
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| 18 | * CLASS is supposed to be printed on banner page, if one is requested */
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| 19 | //usage:#define lpr_full_usage "\n\n"
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| 20 | //usage: " -P lp service to connect to (else uses $PRINTER)"
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| 21 | //usage: "\n -m Send mail on completion"
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| 22 | //usage: "\n -h Print banner page too"
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| 23 | //usage: "\n -V Verbose"
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| 24 | //usage:
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| 25 | //usage:#define lpq_trivial_usage
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| 26 | //usage: "[-P queue[@host[:port]]] [-U USERNAME] [-d JOBID]... [-fs]"
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| 27 | //usage:#define lpq_full_usage "\n\n"
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| 28 | //usage: " -P lp service to connect to (else uses $PRINTER)"
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| 29 | //usage: "\n -d Delete jobs"
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| 30 | //usage: "\n -f Force any waiting job to be printed"
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| 31 | //usage: "\n -s Short display"
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| 32 |
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[2725] | 33 | #include "libbb.h"
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| 34 |
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| 35 | /*
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| 36 | * LPD returns binary 0 on success.
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| 37 | * Otherwise it returns error message.
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| 38 | */
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| 39 | static void get_response_or_say_and_die(int fd, const char *errmsg)
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| 40 | {
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| 41 | ssize_t sz;
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| 42 | char buf[128];
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| 43 |
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| 44 | buf[0] = ' ';
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| 45 | sz = safe_read(fd, buf, 1);
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| 46 | if ('\0' != buf[0]) {
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| 47 | // request has failed
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| 48 | // try to make sure last char is '\n', but do not add
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| 49 | // superfluous one
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| 50 | sz = full_read(fd, buf + 1, 126);
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| 51 | bb_error_msg("error while %s%s", errmsg,
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| 52 | (sz > 0 ? ". Server said:" : ""));
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| 53 | if (sz > 0) {
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| 54 | // sz = (bytes in buf) - 1
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| 55 | if (buf[sz] != '\n')
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| 56 | buf[++sz] = '\n';
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| 57 | safe_write(STDERR_FILENO, buf, sz + 1);
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| 58 | }
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| 59 | xfunc_die();
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| 60 | }
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| 61 | }
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| 62 |
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| 63 | int lpqr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
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| 64 | int lpqr_main(int argc UNUSED_PARAM, char *argv[])
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| 65 | {
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| 66 | enum {
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| 67 | OPT_P = 1 << 0, // -P queue[@host[:port]]. If no -P is given use $PRINTER, then "lp@localhost:515"
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| 68 | OPT_U = 1 << 1, // -U username
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| 69 |
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| 70 | LPR_V = 1 << 2, // -V: be verbose
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| 71 | LPR_h = 1 << 3, // -h: want banner printed
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| 72 | LPR_C = 1 << 4, // -C class: job "class" (? supposedly printed on banner)
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| 73 | LPR_J = 1 << 5, // -J title: the job title for the banner page
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| 74 | LPR_m = 1 << 6, // -m: send mail back to user
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| 75 |
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| 76 | LPQ_SHORT_FMT = 1 << 2, // -s: short listing format
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| 77 | LPQ_DELETE = 1 << 3, // -d: delete job(s)
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| 78 | LPQ_FORCE = 1 << 4, // -f: force waiting job(s) to be printed
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| 79 | };
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| 80 | char tempfile[sizeof("/tmp/lprXXXXXX")];
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| 81 | const char *job_title;
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| 82 | const char *printer_class = ""; // printer class, max 32 char
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| 83 | const char *queue; // name of printer queue
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| 84 | const char *server = "localhost"; // server[:port] of printer queue
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| 85 | char *hostname;
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| 86 | // N.B. IMHO getenv("USER") can be way easily spoofed!
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| 87 | const char *user = xuid2uname(getuid());
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| 88 | unsigned job;
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| 89 | unsigned opts;
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| 90 | int fd;
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| 91 |
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[3232] | 92 | queue = getenv("PRINTER");
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| 93 | if (!queue)
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| 94 | queue = "lp";
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| 95 |
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[2725] | 96 | // parse options
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| 97 | // TODO: set opt_complementary: s,d,f are mutually exclusive
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| 98 | opts = getopt32(argv,
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| 99 | (/*lp*/'r' == applet_name[2]) ? "P:U:VhC:J:m" : "P:U:sdf"
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| 100 | , &queue, &user
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| 101 | , &printer_class, &job_title
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| 102 | );
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| 103 | argv += optind;
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| 104 |
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[3232] | 105 | {
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[2725] | 106 | // queue name is to the left of '@'
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| 107 | char *s = strchr(queue, '@');
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| 108 | if (s) {
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| 109 | // server name is to the right of '@'
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| 110 | *s = '\0';
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| 111 | server = s + 1;
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| 112 | }
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| 113 | }
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| 114 |
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| 115 | // do connect
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| 116 | fd = create_and_connect_stream_or_die(server, 515);
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| 117 |
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| 118 | //
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| 119 | // LPQ ------------------------
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| 120 | //
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| 121 | if (/*lp*/'q' == applet_name[2]) {
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| 122 | char cmd;
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| 123 | // force printing of every job still in queue
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| 124 | if (opts & LPQ_FORCE) {
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| 125 | cmd = 1;
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| 126 | goto command;
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| 127 | // delete job(s)
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| 128 | } else if (opts & LPQ_DELETE) {
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| 129 | fdprintf(fd, "\x5" "%s %s", queue, user);
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| 130 | while (*argv) {
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| 131 | fdprintf(fd, " %s", *argv++);
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| 132 | }
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| 133 | bb_putchar('\n');
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| 134 | // dump current jobs status
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| 135 | // N.B. periodical polling should be achieved
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| 136 | // via "watch -n delay lpq"
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| 137 | // They say it's the UNIX-way :)
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| 138 | } else {
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| 139 | cmd = (opts & LPQ_SHORT_FMT) ? 3 : 4;
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| 140 | command:
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| 141 | fdprintf(fd, "%c" "%s\n", cmd, queue);
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| 142 | bb_copyfd_eof(fd, STDOUT_FILENO);
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| 143 | }
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| 144 |
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| 145 | return EXIT_SUCCESS;
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| 146 | }
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| 147 |
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| 148 | //
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| 149 | // LPR ------------------------
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| 150 | //
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| 151 | if (opts & LPR_V)
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| 152 | bb_error_msg("connected to server");
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| 153 |
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| 154 | job = getpid() % 1000;
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| 155 | hostname = safe_gethostname();
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| 156 |
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| 157 | // no files given on command line? -> use stdin
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| 158 | if (!*argv)
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| 159 | *--argv = (char *)"-";
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| 160 |
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| 161 | fdprintf(fd, "\x2" "%s\n", queue);
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| 162 | get_response_or_say_and_die(fd, "setting queue");
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| 163 |
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| 164 | // process files
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| 165 | do {
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| 166 | unsigned cflen;
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| 167 | int dfd;
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| 168 | struct stat st;
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| 169 | char *c;
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| 170 | char *remote_filename;
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| 171 | char *controlfile;
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| 172 |
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| 173 | // if data file is stdin, we need to dump it first
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| 174 | if (LONE_DASH(*argv)) {
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| 175 | strcpy(tempfile, "/tmp/lprXXXXXX");
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| 176 | dfd = xmkstemp(tempfile);
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| 177 | bb_copyfd_eof(STDIN_FILENO, dfd);
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| 178 | xlseek(dfd, 0, SEEK_SET);
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| 179 | *argv = (char*)bb_msg_standard_input;
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| 180 | } else {
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| 181 | dfd = xopen(*argv, O_RDONLY);
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| 182 | }
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| 183 |
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[3232] | 184 | st.st_size = 0; /* paranoia: fstat may theoretically fail */
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| 185 | fstat(dfd, &st);
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| 186 |
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| 187 | /* Apparently, some servers are buggy and won't accept 0-sized jobs.
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| 188 | * Standard lpr works around it by refusing to send such jobs:
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| 189 | */
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| 190 | if (st.st_size == 0) {
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| 191 | bb_error_msg("nothing to print");
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| 192 | continue;
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| 193 | }
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| 194 |
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[2725] | 195 | /* "The name ... should start with ASCII "cfA",
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| 196 | * followed by a three digit job number, followed
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| 197 | * by the host name which has constructed the file."
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| 198 | * We supply 'c' or 'd' as needed for control/data file. */
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| 199 | remote_filename = xasprintf("fA%03u%s", job, hostname);
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| 200 |
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| 201 | // create control file
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| 202 | // TODO: all lines but 2 last are constants! How we can use this fact?
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| 203 | controlfile = xasprintf(
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| 204 | "H" "%.32s\n" "P" "%.32s\n" /* H HOST, P USER */
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| 205 | "C" "%.32s\n" /* C CLASS - printed on banner page (if L cmd is also given) */
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| 206 | "J" "%.99s\n" /* J JOBNAME */
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| 207 | /* "class name for banner page and job name
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| 208 | * for banner page commands must precede L command" */
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| 209 | "L" "%.32s\n" /* L USER - print banner page, with given user's name */
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| 210 | "M" "%.32s\n" /* M WHOM_TO_MAIL */
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| 211 | "l" "d%.31s\n" /* l DATA_FILE_NAME ("dfAxxx") */
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| 212 | , hostname, user
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| 213 | , printer_class /* can be "" */
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| 214 | , ((opts & LPR_J) ? job_title : *argv)
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| 215 | , (opts & LPR_h) ? user : ""
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| 216 | , (opts & LPR_m) ? user : ""
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| 217 | , remote_filename
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| 218 | );
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[3232] | 219 | // delete possible "\nX\n" (that is, one-char) patterns
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[2725] | 220 | c = controlfile;
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| 221 | while ((c = strchr(c, '\n')) != NULL) {
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| 222 | if (c[1] && c[2] == '\n') {
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[3232] | 223 | overlapping_strcpy(c, c+2);
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[2725] | 224 | } else {
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| 225 | c++;
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| 226 | }
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| 227 | }
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| 228 |
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| 229 | // send control file
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| 230 | if (opts & LPR_V)
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| 231 | bb_error_msg("sending control file");
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| 232 | /* "Acknowledgement processing must occur as usual
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| 233 | * after the command is sent." */
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[3232] | 234 | cflen = (unsigned)strlen(controlfile);
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[2725] | 235 | fdprintf(fd, "\x2" "%u c%s\n", cflen, remote_filename);
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| 236 | get_response_or_say_and_die(fd, "sending control file");
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| 237 | /* "Once all of the contents have
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| 238 | * been delivered, an octet of zero bits is sent as
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| 239 | * an indication that the file being sent is complete.
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| 240 | * A second level of acknowledgement processing
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| 241 | * must occur at this point." */
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| 242 | full_write(fd, controlfile, cflen + 1); /* writes NUL byte too */
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| 243 | get_response_or_say_and_die(fd, "sending control file");
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| 244 |
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| 245 | // send data file, with name "dfaXXX"
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| 246 | if (opts & LPR_V)
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| 247 | bb_error_msg("sending data file");
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| 248 | fdprintf(fd, "\x3" "%"OFF_FMT"u d%s\n", st.st_size, remote_filename);
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| 249 | get_response_or_say_and_die(fd, "sending data file");
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| 250 | if (bb_copyfd_size(dfd, fd, st.st_size) != st.st_size) {
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| 251 | // We're screwed. We sent less bytes than we advertised.
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| 252 | bb_error_msg_and_die("local file changed size?!");
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| 253 | }
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| 254 | write(fd, "", 1); // send ACK
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| 255 | get_response_or_say_and_die(fd, "sending data file");
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| 256 |
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| 257 | // delete temporary file if we dumped stdin
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| 258 | if (*argv == (char*)bb_msg_standard_input)
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| 259 | unlink(tempfile);
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| 260 |
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| 261 | // cleanup
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| 262 | close(fd);
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| 263 | free(remote_filename);
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| 264 | free(controlfile);
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| 265 |
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| 266 | // say job accepted
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| 267 | if (opts & LPR_V)
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| 268 | bb_error_msg("job accepted");
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| 269 |
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| 270 | // next, please!
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| 271 | job = (job + 1) % 1000;
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| 272 | } while (*++argv);
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| 273 |
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| 274 | return EXIT_SUCCESS;
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| 275 | }
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