1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/* 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 tarball for details.
*
* 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(const char *errmsg)
{
static const char newline = '\n';
char buf = ' ';
fflush(stdout);
safe_read(STDOUT_FILENO, &buf, 1);
if ('\0' != buf) {
// request has failed
bb_error_msg("error while %s. Server said:", errmsg);
safe_write(STDERR_FILENO, &buf, 1);
logmode = 0; /* no error messages from bb_copyfd_eof() pls */
bb_copyfd_eof(STDOUT_FILENO, STDERR_FILENO);
safe_write(STDERR_FILENO, &newline, 1);
xfunc_die();
}
}
int lpqr_main(int argc, char *argv[]) MAIN_EXTERNALLY_VISIBLE;
int lpqr_main(int argc, 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 = bb_getpwuid(NULL, -1, getuid());
unsigned job;
unsigned opts;
int old_stdout, 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);
// play with descriptors to save space: fdprintf > printf
old_stdout = dup(STDOUT_FILENO);
xmove_fd(fd, STDOUT_FILENO);
//
// 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) {
printf("\x5" "%s %s", queue, user);
while (*argv) {
printf(" %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:
printf("%c" "%s\n", cmd, queue);
bb_copyfd_eof(STDOUT_FILENO, old_stdout);
}
return EXIT_SUCCESS;
}
//
// LPR ------------------------
//
if (opts & LPR_V)
bb_error_msg("connected to server");
job = getpid() % 1000;
// TODO: when do finally we invent char *xgethostname()?!!
hostname = xzalloc(MAXHOSTNAMELEN+1);
gethostname(hostname, MAXHOSTNAMELEN);
// no files given on command line? -> use stdin
if (!*argv)
*--argv = (char *)"-";
printf("\x2" "%s\n", queue);
get_response_or_say_and_die("setting queue");
// process files
do {
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");
fd = mkstemp(tempfile);
if (fd < 0)
bb_perror_msg_and_die("mkstemp");
bb_copyfd_eof(STDIN_FILENO, fd);
xlseek(fd, 0, SEEK_SET);
*argv = (char*)bb_msg_standard_input;
} else {
fd = 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;
while ((c = strchr(c, '\n')) != NULL) {
c++;
while (c[0] && c[1] == '\n')
memmove(c, c+2, strlen(c+1)); /* strlen(c+1) == strlen(c+2) + 1 */
}
// send control file
if (opts & LPR_V)
bb_error_msg("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." */
printf("\x2" "%u c%s\n" "%s" "%c",
(unsigned)strlen(controlfile),
remote_filename, controlfile, '\0');
get_response_or_say_and_die("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(fd, &st);
printf("\x3" "%"OFF_FMT"u d%s\n", st.st_size, remote_filename);
if (bb_copyfd_size(fd, STDOUT_FILENO, 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?!");
}
bb_putchar('\0');
get_response_or_say_and_die("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);
// next, please!
job = (job + 1) % 1000;
} while (*++argv);
return EXIT_SUCCESS;
}
|
