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 tarball for details.
12 * See RFC 1179 for protocol description.
17 * LPD returns binary 0 on success.
18 * Otherwise it returns error message.
20 static void get_response_or_say_and_die(int fd, const char *errmsg)
26 sz = safe_read(fd, buf, 1);
29 // try to make sure last char is '\n', but do not add
31 sz = full_read(fd, buf + 1, 126);
32 bb_error_msg("error while %s%s", errmsg,
33 (sz > 0 ? ". Server said:" : ""));
35 // sz = (bytes in buf) - 1
38 safe_write(STDERR_FILENO, buf, sz + 1);
44 int lpqr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
45 int lpqr_main(int argc, char *argv[])
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
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
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
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
67 // N.B. IMHO getenv("USER") can be way easily spoofed!
68 const char *user = bb_getpwuid(NULL, -1, getuid());
74 // TODO: set opt_complementary: s,d,f are mutually exclusive
76 (/*lp*/'r' == applet_name[2]) ? "P:U:VhC:J:m" : "P:U:sdf"
78 , &printer_class, &job_title
82 // if queue is not specified -> use $PRINTER
84 queue = getenv("PRINTER");
85 // if queue is still not specified ->
87 // ... queue defaults to "lp"
88 // server defaults to "localhost"
90 // if queue is specified ->
92 // queue name is to the left of '@'
93 char *s = strchr(queue, '@');
95 // server name is to the right of '@'
102 fd = create_and_connect_stream_or_die(server, 515);
105 // LPQ ------------------------
107 if (/*lp*/'q' == applet_name[2]) {
109 // force printing of every job still in queue
110 if (opts & LPQ_FORCE) {
114 } else if (opts & LPQ_DELETE) {
115 fdprintf(fd, "\x5" "%s %s", queue, user);
117 fdprintf(fd, " %s", *argv++);
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 :)
125 cmd = (opts & LPQ_SHORT_FMT) ? 3 : 4;
127 fdprintf(fd, "%c" "%s\n", cmd, queue);
128 bb_copyfd_eof(fd, STDOUT_FILENO);
135 // LPR ------------------------
138 bb_error_msg("connected to server");
140 job = getpid() % 1000;
141 hostname = safe_gethostname();
143 // no files given on command line? -> use stdin
145 *--argv = (char *)"-";
147 fdprintf(fd, "\x2" "%s\n", queue);
148 get_response_or_say_and_die(fd, "setting queue");
155 char *remote_filename;
158 // if data file is stdin, we need to dump it first
159 if (LONE_DASH(*argv)) {
160 strcpy(tempfile, "/tmp/lprXXXXXX");
161 dfd = mkstemp(tempfile);
163 bb_perror_msg_and_die("mkstemp");
164 bb_copyfd_eof(STDIN_FILENO, dfd);
165 xlseek(dfd, 0, SEEK_SET);
166 *argv = (char*)bb_msg_standard_input;
168 dfd = xopen(*argv, O_RDONLY);
171 /* "The name ... should start with ASCII "cfA",
172 * followed by a three digit job number, followed
173 * by the host name which has constructed the file."
174 * We supply 'c' or 'd' as needed for control/data file. */
175 remote_filename = xasprintf("fA%03u%s", job, hostname);
177 // create control file
178 // TODO: all lines but 2 last are constants! How we can use this fact?
179 controlfile = xasprintf(
180 "H" "%.32s\n" "P" "%.32s\n" /* H HOST, P USER */
181 "C" "%.32s\n" /* C CLASS - printed on banner page (if L cmd is also given) */
182 "J" "%.99s\n" /* J JOBNAME */
183 /* "class name for banner page and job name
184 * for banner page commands must precede L command" */
185 "L" "%.32s\n" /* L USER - print banner page, with given user's name */
186 "M" "%.32s\n" /* M WHOM_TO_MAIL */
187 "l" "d%.31s\n" /* l DATA_FILE_NAME ("dfAxxx") */
189 , printer_class /* can be "" */
190 , ((opts & LPR_J) ? job_title : *argv)
191 , (opts & LPR_h) ? user : ""
192 , (opts & LPR_m) ? user : ""
195 // delete possible "\nX\n" patterns
197 while ((c = strchr(c, '\n')) != NULL) {
199 while (c[0] && c[1] == '\n')
200 memmove(c, c+2, strlen(c+1)); /* strlen(c+1) == strlen(c+2) + 1 */
205 bb_error_msg("sending control file");
206 /* "Once all of the contents have
207 * been delivered, an octet of zero bits is sent as
208 * an indication that the file being sent is complete.
209 * A second level of acknowledgement processing
210 * must occur at this point." */
211 fdprintf(fd, "\x2" "%u c%s\n" "%s" "%c",
212 (unsigned)strlen(controlfile),
213 remote_filename, controlfile, '\0');
214 get_response_or_say_and_die(fd, "sending control file");
216 // send data file, with name "dfaXXX"
218 bb_error_msg("sending data file");
219 st.st_size = 0; /* paranoia: fstat may theoretically fail */
221 fdprintf(fd, "\x3" "%"OFF_FMT"u d%s\n", st.st_size, remote_filename);
222 if (bb_copyfd_size(dfd, fd, st.st_size) != st.st_size) {
223 // We're screwed. We sent less bytes than we advertised.
224 bb_error_msg_and_die("local file changed size?!");
226 write(fd, "", 1); // send ACK
227 get_response_or_say_and_die(fd, "sending data file");
229 // delete temporary file if we dumped stdin
230 if (*argv == (char*)bb_msg_standard_input)
235 free(remote_filename);
240 bb_error_msg("job accepted");
243 job = (job + 1) % 1000;