1 /* vi: set sw=4 ts=4: */
3 * bare bones version of lpr & lpq: BSD printing utilities
5 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
7 * Original idea and code:
8 * Walter Harms <WHarms@bfs.de>
10 * Licensed under GPLv2, see file LICENSE in this source tree.
12 * See RFC 1179 for protocol description.
15 //usage:#define lpr_trivial_usage
16 //usage: "-P queue[@host[:port]] -U USERNAME -J TITLE -Vmh [FILE]..."
17 /* -C CLASS exists too, not shown.
18 * CLASS is supposed to be printed on banner page, if one is requested */
19 //usage:#define lpr_full_usage "\n\n"
20 //usage: " -P lp service to connect to (else uses $PRINTER)"
21 //usage: "\n -m Send mail on completion"
22 //usage: "\n -h Print banner page too"
23 //usage: "\n -V Verbose"
25 //usage:#define lpq_trivial_usage
26 //usage: "[-P queue[@host[:port]]] [-U USERNAME] [-d JOBID]... [-fs]"
27 //usage:#define lpq_full_usage "\n\n"
28 //usage: " -P lp service to connect to (else uses $PRINTER)"
29 //usage: "\n -d Delete jobs"
30 //usage: "\n -f Force any waiting job to be printed"
31 //usage: "\n -s Short display"
36 * LPD returns binary 0 on success.
37 * Otherwise it returns error message.
39 static void get_response_or_say_and_die(int fd
, const char *errmsg
)
45 sz
= safe_read(fd
, buf
, 1);
48 // try to make sure last char is '\n', but do not add
50 sz
= full_read(fd
, buf
+ 1, 126);
51 bb_error_msg("error while %s%s", errmsg
,
52 (sz
> 0 ? ". Server said:" : ""));
54 // sz = (bytes in buf) - 1
57 safe_write(STDERR_FILENO
, buf
, sz
+ 1);
63 int lpqr_main(int argc
, char *argv
[]) MAIN_EXTERNALLY_VISIBLE
;
64 int lpqr_main(int argc UNUSED_PARAM
, char *argv
[])
67 OPT_P
= 1 << 0, // -P queue[@host[:port]]. If no -P is given use $PRINTER, then "lp@localhost:515"
68 OPT_U
= 1 << 1, // -U username
70 LPR_V
= 1 << 2, // -V: be verbose
71 LPR_h
= 1 << 3, // -h: want banner printed
72 LPR_C
= 1 << 4, // -C class: job "class" (? supposedly printed on banner)
73 LPR_J
= 1 << 5, // -J title: the job title for the banner page
74 LPR_m
= 1 << 6, // -m: send mail back to user
76 LPQ_SHORT_FMT
= 1 << 2, // -s: short listing format
77 LPQ_DELETE
= 1 << 3, // -d: delete job(s)
78 LPQ_FORCE
= 1 << 4, // -f: force waiting job(s) to be printed
80 char tempfile
[sizeof("/tmp/lprXXXXXX")];
81 const char *job_title
;
82 const char *printer_class
= ""; // printer class, max 32 char
83 const char *queue
; // name of printer queue
84 const char *server
= "localhost"; // server[:port] of printer queue
86 // N.B. IMHO getenv("USER") can be way easily spoofed!
87 const char *user
= xuid2uname(getuid());
92 queue
= getenv("PRINTER");
97 // TODO: set opt_complementary: s,d,f are mutually exclusive
99 (/*lp*/'r' == applet_name
[2]) ? "P:U:VhC:J:m" : "P:U:sdf"
101 , &printer_class
, &job_title
106 // queue name is to the left of '@'
107 char *s
= strchr(queue
, '@');
109 // server name is to the right of '@'
116 fd
= create_and_connect_stream_or_die(server
, 515);
119 // LPQ ------------------------
121 if (/*lp*/'q' == applet_name
[2]) {
123 // force printing of every job still in queue
124 if (opts
& LPQ_FORCE
) {
128 } else if (opts
& LPQ_DELETE
) {
129 fdprintf(fd
, "\x5" "%s %s", queue
, user
);
131 fdprintf(fd
, " %s", *argv
++);
134 // dump current jobs status
135 // N.B. periodical polling should be achieved
136 // via "watch -n delay lpq"
137 // They say it's the UNIX-way :)
139 cmd
= (opts
& LPQ_SHORT_FMT
) ? 3 : 4;
141 fdprintf(fd
, "%c" "%s\n", cmd
, queue
);
142 bb_copyfd_eof(fd
, STDOUT_FILENO
);
149 // LPR ------------------------
152 bb_error_msg("connected to server");
154 job
= getpid() % 1000;
155 hostname
= safe_gethostname();
157 // no files given on command line? -> use stdin
159 *--argv
= (char *)"-";
161 fdprintf(fd
, "\x2" "%s\n", queue
);
162 get_response_or_say_and_die(fd
, "setting queue");
170 char *remote_filename
;
173 // if data file is stdin, we need to dump it first
174 if (LONE_DASH(*argv
)) {
175 strcpy(tempfile
, "/tmp/lprXXXXXX");
176 dfd
= xmkstemp(tempfile
);
177 bb_copyfd_eof(STDIN_FILENO
, dfd
);
178 xlseek(dfd
, 0, SEEK_SET
);
179 *argv
= (char*)bb_msg_standard_input
;
181 dfd
= xopen(*argv
, O_RDONLY
);
184 st
.st_size
= 0; /* paranoia: fstat may theoretically fail */
187 /* Apparently, some servers are buggy and won't accept 0-sized jobs.
188 * Standard lpr works around it by refusing to send such jobs:
190 if (st
.st_size
== 0) {
191 bb_error_msg("nothing to print");
195 /* "The name ... should start with ASCII "cfA",
196 * followed by a three digit job number, followed
197 * by the host name which has constructed the file."
198 * We supply 'c' or 'd' as needed for control/data file. */
199 remote_filename
= xasprintf("fA%03u%s", job
, hostname
);
201 // create control file
202 // TODO: all lines but 2 last are constants! How we can use this fact?
203 controlfile
= xasprintf(
204 "H" "%.32s\n" "P" "%.32s\n" /* H HOST, P USER */
205 "C" "%.32s\n" /* C CLASS - printed on banner page (if L cmd is also given) */
206 "J" "%.99s\n" /* J JOBNAME */
207 /* "class name for banner page and job name
208 * for banner page commands must precede L command" */
209 "L" "%.32s\n" /* L USER - print banner page, with given user's name */
210 "M" "%.32s\n" /* M WHOM_TO_MAIL */
211 "l" "d%.31s\n" /* l DATA_FILE_NAME ("dfAxxx") */
213 , printer_class
/* can be "" */
214 , ((opts
& LPR_J
) ? job_title
: *argv
)
215 , (opts
& LPR_h
) ? user
: ""
216 , (opts
& LPR_m
) ? user
: ""
219 // delete possible "\nX\n" (that is, one-char) patterns
221 while ((c
= strchr(c
, '\n')) != NULL
) {
222 if (c
[1] && c
[2] == '\n') {
223 overlapping_strcpy(c
, c
+2);
231 bb_error_msg("sending control file");
232 /* "Acknowledgement processing must occur as usual
233 * after the command is sent." */
234 cflen
= (unsigned)strlen(controlfile
);
235 fdprintf(fd
, "\x2" "%u c%s\n", cflen
, remote_filename
);
236 get_response_or_say_and_die(fd
, "sending control file");
237 /* "Once all of the contents have
238 * been delivered, an octet of zero bits is sent as
239 * an indication that the file being sent is complete.
240 * A second level of acknowledgement processing
241 * must occur at this point." */
242 full_write(fd
, controlfile
, cflen
+ 1); /* writes NUL byte too */
243 get_response_or_say_and_die(fd
, "sending control file");
245 // send data file, with name "dfaXXX"
247 bb_error_msg("sending data file");
248 fdprintf(fd
, "\x3" "%"OFF_FMT
"u d%s\n", st
.st_size
, remote_filename
);
249 get_response_or_say_and_die(fd
, "sending data file");
250 if (bb_copyfd_size(dfd
, fd
, st
.st_size
) != st
.st_size
) {
251 // We're screwed. We sent less bytes than we advertised.
252 bb_error_msg_and_die("local file changed size?!");
254 write(fd
, "", 1); // send ACK
255 get_response_or_say_and_die(fd
, "sending data file");
257 // delete temporary file if we dumped stdin
258 if (*argv
== (char*)bb_msg_standard_input
)
263 free(remote_filename
);
268 bb_error_msg("job accepted");
271 job
= (job
+ 1) % 1000;