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