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
|
/* $OpenBSD: lp_rmjob.c,v 1.1.1.1 2018/04/27 16:14:36 eric Exp $ */
/*
* Copyright (c) 2017 Eric Faurot <eric@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <limits.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "lp.h"
#include "log.h"
static int docheck(struct lp_printer *, const char *, struct lp_jobfilter *,
const char *, int, int);
static void doremove(int, struct lp_printer *, const char *);
int
lp_rmjob(int ofd, struct lp_printer *lp, const char *agent,
struct lp_jobfilter *jf)
{
struct lp_queue q;
char currjob[PATH_MAX];
pid_t currpid;
int active, i, killed = 0;
if ((lp_readqueue(lp, &q)) == -1) {
log_warnx("cannot read queue");
return 0;
}
if (q.count == 0) {
lp_clearqueue(&q);
return 0;
}
/*
* Find the current task being printed, and kill the printer process
* if the file is to be removed.
*/
if (lp_getcurrtask(lp, &currpid, currjob, sizeof(currjob)) == -1)
log_warnx("cannot get current task");
if (currjob[0] && docheck(lp, agent, jf, currjob, 1, 0) == 1) {
if (kill(currpid, SIGINT) == -1)
log_warn("lpr: cannot kill printer process %d",
(int)currpid);
else
killed = 1;
}
for(i = 0; i < q.count; i++) {
active = !strcmp(q.cfname[i], currjob);
switch (docheck(lp, agent, jf, q.cfname[i], active, 0)) {
case 0:
break;
case 1:
doremove(ofd, lp, q.cfname[i]);
break;
case 2:
if (lp->lp_type == PRN_LPR)
dprintf(ofd, "%s: ", lpd_hostname);
dprintf(ofd, "%s: Permission denied\n", q.cfname[i]);
break;
}
}
lp_clearqueue(&q);
return killed;
}
/*
* Check if a file must be removed.
*
* Return:
* 0: no
* 1: yes
* 2: yes but user has no right to do so
*/
static int
docheck(struct lp_printer *lp, const char *agent, struct lp_jobfilter *jf,
const char *cfname, int current, int local)
{
FILE *fp;
ssize_t len;
size_t linesz = 0;
char *line = NULL, *person = NULL;
int i, own = 0;
/* The "-all" agent means remove all jobs from the client host. */
if (!strcmp(agent, "-all") && !strcmp(LP_JOBHOST(cfname), jf->hostfrom))
return 1;
/*
* Consider the root user owns local files, and files sent from
* the same machine.
*/
if (!strcmp(agent, "root"))
own = local || !strcmp(LP_JOBHOST(cfname), jf->hostfrom);
/* Check if the task person matches the agent. */
fp = lp_fopen(lp, cfname);
if (fp == NULL) {
log_warn("cannot open %s", cfname);
return 0;
}
while ((len = getline(&line, &linesz, fp)) != -1) {
if (line[len-1] == '\n')
line[len - 1] = '\0';
if (line[0] == 'P') {
person = line + 1;
if (!strcmp(person, agent) &&
!strcmp(LP_JOBHOST(cfname), jf->hostfrom))
own = 1;
break;
}
}
fclose(fp);
if (person == NULL) {
free(line);
return 0;
}
/* Remove the current task if the request list is empty. */
if (current && jf->nuser == 0 && jf->njob == 0)
goto remove;
/* Check for matching jobnum. */
for (i = 0; i < jf->njob; i++)
if (jf->jobs[i] == LP_JOBNUM(cfname))
goto remove;
/* Check if person is in user list. */
for (i = 0; i < jf->nuser; i++)
if (!strcmp(jf->users[i], person))
goto remove;
free(line);
return 0;
remove:
free(line);
return own ? 1 : 2;
}
static void
doremove(int ofd, struct lp_printer *lp, const char *cfname)
{
FILE *fp;
ssize_t len;
size_t linesz = 0;
char *line = NULL;
fp = lp_fopen(lp, cfname);
if (fp == NULL) {
log_warn("cannot open %s", cfname);
return;
}
if (lp->lp_type == PRN_LPR)
dprintf(ofd, "%s: ", lpd_hostname);
/* First, remove the control file. */
if (lp_unlink(lp, cfname) == -1) {
log_warn("cannot unlink %s", cfname);
dprintf(ofd, "cannot dequeue %s\n", cfname);
}
else {
log_info("removed job %s", cfname);
dprintf(ofd, "%s dequeued\n", cfname);
}
/* Then unlink all data files. */
while ((len = getline(&line, &linesz, fp)) != -1) {
if (line[len-1] == '\n')
line[len - 1] = '\0';
if (line[0] != 'U')
continue;
if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
continue;
if (lp->lp_type == PRN_LPR)
dprintf(ofd, "%s: ", lpd_hostname);
if (lp_unlink(lp, line + 1) == -1) {
log_warn("cannot unlink %s", line + 1);
dprintf(ofd, "cannot dequeue %s\n", line + 1);
}
else
dprintf(ofd, "%s dequeued\n", line + 1);
}
fclose(fp);
}
|
