| /* vi: set sw=4 ts=4: */ |
| /* |
| * bare bones version of lpr & lpq: BSD printing utilities |
| * |
| * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com> |
| * |
| * Original idea and code: |
| * Walter Harms <WHarms@bfs.de> |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| * |
| * See RFC 1179 for protocol description. |
| */ |
| #include "libbb.h" |
| |
| /* |
| * LPD returns binary 0 on success. |
| * Otherwise it returns error message. |
| */ |
| static void get_response_or_say_and_die(int fd, const char *errmsg) |
| { |
| ssize_t sz; |
| char buf[128]; |
| |
| buf[0] = ' '; |
| sz = safe_read(fd, buf, 1); |
| if ('\0' != buf[0]) { |
| // request has failed |
| // try to make sure last char is '\n', but do not add |
| // superfluous one |
| sz = full_read(fd, buf + 1, 126); |
| bb_error_msg("error while %s%s", errmsg, |
| (sz > 0 ? ". Server said:" : "")); |
| if (sz > 0) { |
| // sz = (bytes in buf) - 1 |
| if (buf[sz] != '\n') |
| buf[++sz] = '\n'; |
| safe_write(STDERR_FILENO, buf, sz + 1); |
| } |
| xfunc_die(); |
| } |
| } |
| |
| int lpqr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE; |
| int lpqr_main(int argc UNUSED_PARAM, char *argv[]) |
| { |
| enum { |
| OPT_P = 1 << 0, // -P queue[@host[:port]]. If no -P is given use $PRINTER, then "lp@localhost:515" |
| OPT_U = 1 << 1, // -U username |
| |
| LPR_V = 1 << 2, // -V: be verbose |
| LPR_h = 1 << 3, // -h: want banner printed |
| LPR_C = 1 << 4, // -C class: job "class" (? supposedly printed on banner) |
| LPR_J = 1 << 5, // -J title: the job title for the banner page |
| LPR_m = 1 << 6, // -m: send mail back to user |
| |
| LPQ_SHORT_FMT = 1 << 2, // -s: short listing format |
| LPQ_DELETE = 1 << 3, // -d: delete job(s) |
| LPQ_FORCE = 1 << 4, // -f: force waiting job(s) to be printed |
| }; |
| char tempfile[sizeof("/tmp/lprXXXXXX")]; |
| const char *job_title; |
| const char *printer_class = ""; // printer class, max 32 char |
| const char *queue; // name of printer queue |
| const char *server = "localhost"; // server[:port] of printer queue |
| char *hostname; |
| // N.B. IMHO getenv("USER") can be way easily spoofed! |
| const char *user = xuid2uname(getuid()); |
| unsigned job; |
| unsigned opts; |
| int fd; |
| |
| // parse options |
| // TODO: set opt_complementary: s,d,f are mutually exclusive |
| opts = getopt32(argv, |
| (/*lp*/'r' == applet_name[2]) ? "P:U:VhC:J:m" : "P:U:sdf" |
| , &queue, &user |
| , &printer_class, &job_title |
| ); |
| argv += optind; |
| |
| // if queue is not specified -> use $PRINTER |
| if (!(opts & OPT_P)) |
| queue = getenv("PRINTER"); |
| // if queue is still not specified -> |
| if (!queue) { |
| // ... queue defaults to "lp" |
| // server defaults to "localhost" |
| queue = "lp"; |
| // if queue is specified -> |
| } else { |
| // queue name is to the left of '@' |
| char *s = strchr(queue, '@'); |
| if (s) { |
| // server name is to the right of '@' |
| *s = '\0'; |
| server = s + 1; |
| } |
| } |
| |
| // do connect |
| fd = create_and_connect_stream_or_die(server, 515); |
| |
| // |
| // LPQ ------------------------ |
| // |
| if (/*lp*/'q' == applet_name[2]) { |
| char cmd; |
| // force printing of every job still in queue |
| if (opts & LPQ_FORCE) { |
| cmd = 1; |
| goto command; |
| // delete job(s) |
| } else if (opts & LPQ_DELETE) { |
| fdprintf(fd, "\x5" "%s %s", queue, user); |
| while (*argv) { |
| fdprintf(fd, " %s", *argv++); |
| } |
| bb_putchar('\n'); |
| // dump current jobs status |
| // N.B. periodical polling should be achieved |
| // via "watch -n delay lpq" |
| // They say it's the UNIX-way :) |
| } else { |
| cmd = (opts & LPQ_SHORT_FMT) ? 3 : 4; |
| command: |
| fdprintf(fd, "%c" "%s\n", cmd, queue); |
| bb_copyfd_eof(fd, STDOUT_FILENO); |
| } |
| |
| return EXIT_SUCCESS; |
| } |
| |
| // |
| // LPR ------------------------ |
| // |
| if (opts & LPR_V) |
| bb_error_msg("connected to server"); |
| |
| job = getpid() % 1000; |
| hostname = safe_gethostname(); |
| |
| // no files given on command line? -> use stdin |
| if (!*argv) |
| *--argv = (char *)"-"; |
| |
| fdprintf(fd, "\x2" "%s\n", queue); |
| get_response_or_say_and_die(fd, "setting queue"); |
| |
| // process files |
| do { |
| unsigned cflen; |
| int dfd; |
| struct stat st; |
| char *c; |
| char *remote_filename; |
| char *controlfile; |
| |
| // if data file is stdin, we need to dump it first |
| if (LONE_DASH(*argv)) { |
| strcpy(tempfile, "/tmp/lprXXXXXX"); |
| dfd = xmkstemp(tempfile); |
| bb_copyfd_eof(STDIN_FILENO, dfd); |
| xlseek(dfd, 0, SEEK_SET); |
| *argv = (char*)bb_msg_standard_input; |
| } else { |
| dfd = xopen(*argv, O_RDONLY); |
| } |
| |
| /* "The name ... should start with ASCII "cfA", |
| * followed by a three digit job number, followed |
| * by the host name which has constructed the file." |
| * We supply 'c' or 'd' as needed for control/data file. */ |
| remote_filename = xasprintf("fA%03u%s", job, hostname); |
| |
| // create control file |
| // TODO: all lines but 2 last are constants! How we can use this fact? |
| controlfile = xasprintf( |
| "H" "%.32s\n" "P" "%.32s\n" /* H HOST, P USER */ |
| "C" "%.32s\n" /* C CLASS - printed on banner page (if L cmd is also given) */ |
| "J" "%.99s\n" /* J JOBNAME */ |
| /* "class name for banner page and job name |
| * for banner page commands must precede L command" */ |
| "L" "%.32s\n" /* L USER - print banner page, with given user's name */ |
| "M" "%.32s\n" /* M WHOM_TO_MAIL */ |
| "l" "d%.31s\n" /* l DATA_FILE_NAME ("dfAxxx") */ |
| , hostname, user |
| , printer_class /* can be "" */ |
| , ((opts & LPR_J) ? job_title : *argv) |
| , (opts & LPR_h) ? user : "" |
| , (opts & LPR_m) ? user : "" |
| , remote_filename |
| ); |
| // delete possible "\nX\n" patterns |
| c = controlfile; |
| cflen = (unsigned)strlen(controlfile); |
| while ((c = strchr(c, '\n')) != NULL) { |
| if (c[1] && c[2] == '\n') { |
| /* can't use strcpy, results are undefined */ |
| memmove(c, c+2, cflen - (c-controlfile) - 1); |
| cflen -= 2; |
| } else { |
| c++; |
| } |
| } |
| |
| // send control file |
| if (opts & LPR_V) |
| bb_error_msg("sending control file"); |
| /* "Acknowledgement processing must occur as usual |
| * after the command is sent." */ |
| fdprintf(fd, "\x2" "%u c%s\n", cflen, remote_filename); |
| get_response_or_say_and_die(fd, "sending control file"); |
| /* "Once all of the contents have |
| * been delivered, an octet of zero bits is sent as |
| * an indication that the file being sent is complete. |
| * A second level of acknowledgement processing |
| * must occur at this point." */ |
| full_write(fd, controlfile, cflen + 1); /* writes NUL byte too */ |
| get_response_or_say_and_die(fd, "sending control file"); |
| |
| // send data file, with name "dfaXXX" |
| if (opts & LPR_V) |
| bb_error_msg("sending data file"); |
| st.st_size = 0; /* paranoia: fstat may theoretically fail */ |
| fstat(dfd, &st); |
| fdprintf(fd, "\x3" "%"OFF_FMT"u d%s\n", st.st_size, remote_filename); |
| get_response_or_say_and_die(fd, "sending data file"); |
| if (bb_copyfd_size(dfd, fd, st.st_size) != st.st_size) { |
| // We're screwed. We sent less bytes than we advertised. |
| bb_error_msg_and_die("local file changed size?!"); |
| } |
| write(fd, "", 1); // send ACK |
| get_response_or_say_and_die(fd, "sending data file"); |
| |
| // delete temporary file if we dumped stdin |
| if (*argv == (char*)bb_msg_standard_input) |
| unlink(tempfile); |
| |
| // cleanup |
| close(fd); |
| free(remote_filename); |
| free(controlfile); |
| |
| // say job accepted |
| if (opts & LPR_V) |
| bb_error_msg("job accepted"); |
| |
| // next, please! |
| job = (job + 1) % 1000; |
| } while (*++argv); |
| |
| return EXIT_SUCCESS; |
| } |