[3320] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * bare bones version of lpr & lpq: BSD printing utilities
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
|
---|
| 6 | *
|
---|
| 7 | * Original idea and code:
|
---|
| 8 | * Walter Harms <WHarms@bfs.de>
|
---|
| 9 | *
|
---|
| 10 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
| 11 | *
|
---|
| 12 | * See RFC 1179 for protocol description.
|
---|
| 13 | */
|
---|
| 14 | #include "libbb.h"
|
---|
| 15 |
|
---|
| 16 | /*
|
---|
| 17 | * LPD returns binary 0 on success.
|
---|
| 18 | * Otherwise it returns error message.
|
---|
| 19 | */
|
---|
| 20 | static void get_response_or_say_and_die(int fd, const char *errmsg)
|
---|
| 21 | {
|
---|
| 22 | ssize_t sz;
|
---|
| 23 | char buf[128];
|
---|
| 24 |
|
---|
| 25 | buf[0] = ' ';
|
---|
| 26 | sz = safe_read(fd, buf, 1);
|
---|
| 27 | if ('\0' != buf[0]) {
|
---|
| 28 | // request has failed
|
---|
| 29 | // try to make sure last char is '\n', but do not add
|
---|
| 30 | // superfluous one
|
---|
| 31 | sz = full_read(fd, buf + 1, 126);
|
---|
| 32 | bb_error_msg("error while %s%s", errmsg,
|
---|
| 33 | (sz > 0 ? ". Server said:" : ""));
|
---|
| 34 | if (sz > 0) {
|
---|
| 35 | // sz = (bytes in buf) - 1
|
---|
| 36 | if (buf[sz] != '\n')
|
---|
| 37 | buf[++sz] = '\n';
|
---|
| 38 | safe_write(STDERR_FILENO, buf, sz + 1);
|
---|
| 39 | }
|
---|
| 40 | xfunc_die();
|
---|
| 41 | }
|
---|
| 42 | }
|
---|
| 43 |
|
---|
| 44 | int lpqr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 45 | int lpqr_main(int argc UNUSED_PARAM, char *argv[])
|
---|
| 46 | {
|
---|
| 47 | enum {
|
---|
| 48 | OPT_P = 1 << 0, // -P queue[@host[:port]]. If no -P is given use $PRINTER, then "lp@localhost:515"
|
---|
| 49 | OPT_U = 1 << 1, // -U username
|
---|
| 50 |
|
---|
| 51 | LPR_V = 1 << 2, // -V: be verbose
|
---|
| 52 | LPR_h = 1 << 3, // -h: want banner printed
|
---|
| 53 | LPR_C = 1 << 4, // -C class: job "class" (? supposedly printed on banner)
|
---|
| 54 | LPR_J = 1 << 5, // -J title: the job title for the banner page
|
---|
| 55 | LPR_m = 1 << 6, // -m: send mail back to user
|
---|
| 56 |
|
---|
| 57 | LPQ_SHORT_FMT = 1 << 2, // -s: short listing format
|
---|
| 58 | LPQ_DELETE = 1 << 3, // -d: delete job(s)
|
---|
| 59 | LPQ_FORCE = 1 << 4, // -f: force waiting job(s) to be printed
|
---|
| 60 | };
|
---|
| 61 | char tempfile[sizeof("/tmp/lprXXXXXX")];
|
---|
| 62 | const char *job_title;
|
---|
| 63 | const char *printer_class = ""; // printer class, max 32 char
|
---|
| 64 | const char *queue; // name of printer queue
|
---|
| 65 | const char *server = "localhost"; // server[:port] of printer queue
|
---|
| 66 | char *hostname;
|
---|
| 67 | // N.B. IMHO getenv("USER") can be way easily spoofed!
|
---|
| 68 | const char *user = xuid2uname(getuid());
|
---|
| 69 | unsigned job;
|
---|
| 70 | unsigned opts;
|
---|
| 71 | int fd;
|
---|
| 72 |
|
---|
| 73 | // parse options
|
---|
| 74 | // TODO: set opt_complementary: s,d,f are mutually exclusive
|
---|
| 75 | opts = getopt32(argv,
|
---|
| 76 | (/*lp*/'r' == applet_name[2]) ? "P:U:VhC:J:m" : "P:U:sdf"
|
---|
| 77 | , &queue, &user
|
---|
| 78 | , &printer_class, &job_title
|
---|
| 79 | );
|
---|
| 80 | argv += optind;
|
---|
| 81 |
|
---|
| 82 | // if queue is not specified -> use $PRINTER
|
---|
| 83 | if (!(opts & OPT_P))
|
---|
| 84 | queue = getenv("PRINTER");
|
---|
| 85 | // if queue is still not specified ->
|
---|
| 86 | if (!queue) {
|
---|
| 87 | // ... queue defaults to "lp"
|
---|
| 88 | // server defaults to "localhost"
|
---|
| 89 | queue = "lp";
|
---|
| 90 | // if queue is specified ->
|
---|
| 91 | } else {
|
---|
| 92 | // queue name is to the left of '@'
|
---|
| 93 | char *s = strchr(queue, '@');
|
---|
| 94 | if (s) {
|
---|
| 95 | // server name is to the right of '@'
|
---|
| 96 | *s = '\0';
|
---|
| 97 | server = s + 1;
|
---|
| 98 | }
|
---|
| 99 | }
|
---|
| 100 |
|
---|
| 101 | // do connect
|
---|
| 102 | fd = create_and_connect_stream_or_die(server, 515);
|
---|
| 103 |
|
---|
| 104 | //
|
---|
| 105 | // LPQ ------------------------
|
---|
| 106 | //
|
---|
| 107 | if (/*lp*/'q' == applet_name[2]) {
|
---|
| 108 | char cmd;
|
---|
| 109 | // force printing of every job still in queue
|
---|
| 110 | if (opts & LPQ_FORCE) {
|
---|
| 111 | cmd = 1;
|
---|
| 112 | goto command;
|
---|
| 113 | // delete job(s)
|
---|
| 114 | } else if (opts & LPQ_DELETE) {
|
---|
| 115 | fdprintf(fd, "\x5" "%s %s", queue, user);
|
---|
| 116 | while (*argv) {
|
---|
| 117 | fdprintf(fd, " %s", *argv++);
|
---|
| 118 | }
|
---|
| 119 | bb_putchar('\n');
|
---|
| 120 | // dump current jobs status
|
---|
| 121 | // N.B. periodical polling should be achieved
|
---|
| 122 | // via "watch -n delay lpq"
|
---|
| 123 | // They say it's the UNIX-way :)
|
---|
| 124 | } else {
|
---|
| 125 | cmd = (opts & LPQ_SHORT_FMT) ? 3 : 4;
|
---|
| 126 | command:
|
---|
| 127 | fdprintf(fd, "%c" "%s\n", cmd, queue);
|
---|
| 128 | bb_copyfd_eof(fd, STDOUT_FILENO);
|
---|
| 129 | }
|
---|
| 130 |
|
---|
| 131 | return EXIT_SUCCESS;
|
---|
| 132 | }
|
---|
| 133 |
|
---|
| 134 | //
|
---|
| 135 | // LPR ------------------------
|
---|
| 136 | //
|
---|
| 137 | if (opts & LPR_V)
|
---|
| 138 | bb_error_msg("connected to server");
|
---|
| 139 |
|
---|
| 140 | job = getpid() % 1000;
|
---|
| 141 | hostname = safe_gethostname();
|
---|
| 142 |
|
---|
| 143 | // no files given on command line? -> use stdin
|
---|
| 144 | if (!*argv)
|
---|
| 145 | *--argv = (char *)"-";
|
---|
| 146 |
|
---|
| 147 | fdprintf(fd, "\x2" "%s\n", queue);
|
---|
| 148 | get_response_or_say_and_die(fd, "setting queue");
|
---|
| 149 |
|
---|
| 150 | // process files
|
---|
| 151 | do {
|
---|
| 152 | unsigned cflen;
|
---|
| 153 | int dfd;
|
---|
| 154 | struct stat st;
|
---|
| 155 | char *c;
|
---|
| 156 | char *remote_filename;
|
---|
| 157 | char *controlfile;
|
---|
| 158 |
|
---|
| 159 | // if data file is stdin, we need to dump it first
|
---|
| 160 | if (LONE_DASH(*argv)) {
|
---|
| 161 | strcpy(tempfile, "/tmp/lprXXXXXX");
|
---|
| 162 | dfd = xmkstemp(tempfile);
|
---|
| 163 | bb_copyfd_eof(STDIN_FILENO, dfd);
|
---|
| 164 | xlseek(dfd, 0, SEEK_SET);
|
---|
| 165 | *argv = (char*)bb_msg_standard_input;
|
---|
| 166 | } else {
|
---|
| 167 | dfd = xopen(*argv, O_RDONLY);
|
---|
| 168 | }
|
---|
| 169 |
|
---|
| 170 | /* "The name ... should start with ASCII "cfA",
|
---|
| 171 | * followed by a three digit job number, followed
|
---|
| 172 | * by the host name which has constructed the file."
|
---|
| 173 | * We supply 'c' or 'd' as needed for control/data file. */
|
---|
| 174 | remote_filename = xasprintf("fA%03u%s", job, hostname);
|
---|
| 175 |
|
---|
| 176 | // create control file
|
---|
| 177 | // TODO: all lines but 2 last are constants! How we can use this fact?
|
---|
| 178 | controlfile = xasprintf(
|
---|
| 179 | "H" "%.32s\n" "P" "%.32s\n" /* H HOST, P USER */
|
---|
| 180 | "C" "%.32s\n" /* C CLASS - printed on banner page (if L cmd is also given) */
|
---|
| 181 | "J" "%.99s\n" /* J JOBNAME */
|
---|
| 182 | /* "class name for banner page and job name
|
---|
| 183 | * for banner page commands must precede L command" */
|
---|
| 184 | "L" "%.32s\n" /* L USER - print banner page, with given user's name */
|
---|
| 185 | "M" "%.32s\n" /* M WHOM_TO_MAIL */
|
---|
| 186 | "l" "d%.31s\n" /* l DATA_FILE_NAME ("dfAxxx") */
|
---|
| 187 | , hostname, user
|
---|
| 188 | , printer_class /* can be "" */
|
---|
| 189 | , ((opts & LPR_J) ? job_title : *argv)
|
---|
| 190 | , (opts & LPR_h) ? user : ""
|
---|
| 191 | , (opts & LPR_m) ? user : ""
|
---|
| 192 | , remote_filename
|
---|
| 193 | );
|
---|
| 194 | // delete possible "\nX\n" patterns
|
---|
| 195 | c = controlfile;
|
---|
| 196 | cflen = (unsigned)strlen(controlfile);
|
---|
| 197 | while ((c = strchr(c, '\n')) != NULL) {
|
---|
| 198 | if (c[1] && c[2] == '\n') {
|
---|
| 199 | /* can't use strcpy, results are undefined */
|
---|
| 200 | memmove(c, c+2, cflen - (c-controlfile) - 1);
|
---|
| 201 | cflen -= 2;
|
---|
| 202 | } else {
|
---|
| 203 | c++;
|
---|
| 204 | }
|
---|
| 205 | }
|
---|
| 206 |
|
---|
| 207 | // send control file
|
---|
| 208 | if (opts & LPR_V)
|
---|
| 209 | bb_error_msg("sending control file");
|
---|
| 210 | /* "Acknowledgement processing must occur as usual
|
---|
| 211 | * after the command is sent." */
|
---|
| 212 | fdprintf(fd, "\x2" "%u c%s\n", cflen, remote_filename);
|
---|
| 213 | get_response_or_say_and_die(fd, "sending control file");
|
---|
| 214 | /* "Once all of the contents have
|
---|
| 215 | * been delivered, an octet of zero bits is sent as
|
---|
| 216 | * an indication that the file being sent is complete.
|
---|
| 217 | * A second level of acknowledgement processing
|
---|
| 218 | * must occur at this point." */
|
---|
| 219 | full_write(fd, controlfile, cflen + 1); /* writes NUL byte too */
|
---|
| 220 | get_response_or_say_and_die(fd, "sending control file");
|
---|
| 221 |
|
---|
| 222 | // send data file, with name "dfaXXX"
|
---|
| 223 | if (opts & LPR_V)
|
---|
| 224 | bb_error_msg("sending data file");
|
---|
| 225 | st.st_size = 0; /* paranoia: fstat may theoretically fail */
|
---|
| 226 | fstat(dfd, &st);
|
---|
| 227 | fdprintf(fd, "\x3" "%"OFF_FMT"u d%s\n", st.st_size, remote_filename);
|
---|
| 228 | get_response_or_say_and_die(fd, "sending data file");
|
---|
| 229 | if (bb_copyfd_size(dfd, fd, st.st_size) != st.st_size) {
|
---|
| 230 | // We're screwed. We sent less bytes than we advertised.
|
---|
| 231 | bb_error_msg_and_die("local file changed size?!");
|
---|
| 232 | }
|
---|
| 233 | write(fd, "", 1); // send ACK
|
---|
| 234 | get_response_or_say_and_die(fd, "sending data file");
|
---|
| 235 |
|
---|
| 236 | // delete temporary file if we dumped stdin
|
---|
| 237 | if (*argv == (char*)bb_msg_standard_input)
|
---|
| 238 | unlink(tempfile);
|
---|
| 239 |
|
---|
| 240 | // cleanup
|
---|
| 241 | close(fd);
|
---|
| 242 | free(remote_filename);
|
---|
| 243 | free(controlfile);
|
---|
| 244 |
|
---|
| 245 | // say job accepted
|
---|
| 246 | if (opts & LPR_V)
|
---|
| 247 | bb_error_msg("job accepted");
|
---|
| 248 |
|
---|
| 249 | // next, please!
|
---|
| 250 | job = (job + 1) % 1000;
|
---|
| 251 | } while (*++argv);
|
---|
| 252 |
|
---|
| 253 | return EXIT_SUCCESS;
|
---|
| 254 | }
|
---|