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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
6: * provided that the above copyright notice and this paragraph are
7: * duplicated in all such forms and that any documentation,
8: * advertising materials, and other materials related to such
9: * distribution and use acknowledge that the software was developed
10: * by the University of California, Berkeley. The name of the
11: * University may not be used to endorse or promote products derived
12: * from this software without specific prior written permission.
13: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16: */
17:
18: #ifndef lint
19: static char sccsid[] = "@(#)rmjob.c 5.3 (Berkeley) 6/30/88";
20: #endif /* not lint */
21:
22: /*
23: * rmjob - remove the specified jobs from the queue.
24: */
25:
26: #include "lp.h"
27:
28: /*
29: * Stuff for handling lprm specifications
30: */
31: extern char *user[]; /* users to process */
32: extern int users; /* # of users in user array */
33: extern int requ[]; /* job number of spool entries */
34: extern int requests; /* # of spool requests */
35: extern char *person; /* name of person doing lprm */
36:
37: char root[] = "root";
38: int all = 0; /* eliminate all files (root only) */
39: int cur_daemon; /* daemon's pid */
40: char current[40]; /* active control file name */
41:
42: int iscf();
43:
44: rmjob()
45: {
46: register int i, nitems;
47: int assasinated = 0;
48: struct direct **files;
49:
50: if ((i = pgetent(line, printer)) < 0)
51: fatal("cannot open printer description file");
52: else if (i == 0)
53: fatal("unknown printer");
54: if ((SD = pgetstr("sd", &bp)) == NULL)
55: SD = DEFSPOOL;
56: if ((LO = pgetstr("lo", &bp)) == NULL)
57: LO = DEFLOCK;
58: if ((LP = pgetstr("lp", &bp)) == NULL)
59: LP = DEFDEVLP;
60: if ((RP = pgetstr("rp", &bp)) == NULL)
61: RP = DEFLP;
62: RM = pgetstr("rm", &bp);
63:
64: /*
65: * If the format was `lprm -' and the user isn't the super-user,
66: * then fake things to look like he said `lprm user'.
67: */
68: if (users < 0) {
69: if (getuid() == 0)
70: all = 1; /* all files in local queue */
71: else {
72: user[0] = person;
73: users = 1;
74: }
75: }
76: if (!strcmp(person, "-all")) {
77: if (from == host)
78: fatal("The login name \"-all\" is reserved");
79: all = 1; /* all those from 'from' */
80: person = root;
81: }
82:
83: if (chdir(SD) < 0)
84: fatal("cannot chdir to spool directory");
85: if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
86: fatal("cannot access spool directory");
87:
88: if (nitems) {
89: /*
90: * Check for an active printer daemon (in which case we
91: * kill it if it is reading our file) then remove stuff
92: * (after which we have to restart the daemon).
93: */
94: if (lockchk(LO) && chk(current)) {
95: assasinated = kill(cur_daemon, SIGINT) == 0;
96: if (!assasinated)
97: fatal("cannot kill printer daemon");
98: }
99: /*
100: * process the files
101: */
102: for (i = 0; i < nitems; i++)
103: process(files[i]->d_name);
104: }
105: chkremote();
106: /*
107: * Restart the printer daemon if it was killed
108: */
109: if (assasinated && !startdaemon(printer))
110: fatal("cannot restart printer daemon\n");
111: exit(0);
112: }
113:
114: /*
115: * Process a lock file: collect the pid of the active
116: * daemon and the file name of the active spool entry.
117: * Return boolean indicating existence of a lock file.
118: */
119: lockchk(s)
120: char *s;
121: {
122: register FILE *fp;
123: register int i, n;
124:
125: if ((fp = fopen(s, "r")) == NULL)
126: if (errno == EACCES)
127: fatal("can't access lock file");
128: else
129: return(0);
130: if (!getline(fp)) {
131: (void) fclose(fp);
132: return(0); /* no daemon present */
133: }
134: cur_daemon = atoi(line);
135: if (kill(cur_daemon, 0) < 0) {
136: (void) fclose(fp);
137: return(0); /* no daemon present */
138: }
139: for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
140: if (i > 5) {
141: n = 1;
142: break;
143: }
144: sleep(i);
145: }
146: current[n-1] = '\0';
147: (void) fclose(fp);
148: return(1);
149: }
150:
151: /*
152: * Process a control file.
153: */
154: process(file)
155: char *file;
156: {
157: FILE *cfp;
158:
159: if (!chk(file))
160: return;
161: if ((cfp = fopen(file, "r")) == NULL)
162: fatal("cannot open %s", file);
163: while (getline(cfp)) {
164: switch (line[0]) {
165: case 'U': /* unlink associated files */
166: if (from != host)
167: printf("%s: ", host);
168: printf(unlink(line+1) ? "cannot dequeue %s\n" :
169: "%s dequeued\n", line+1);
170: }
171: }
172: (void) fclose(cfp);
173: if (from != host)
174: printf("%s: ", host);
175: printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file);
176: }
177:
178: /*
179: * Do the dirty work in checking
180: */
181: chk(file)
182: char *file;
183: {
184: register int *r, n;
185: register char **u, *cp;
186: FILE *cfp;
187:
188: /*
189: * Check for valid cf file name (mostly checking current).
190: */
191: if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
192: return(0);
193:
194: if (all && (from == host || !strcmp(from, file+6)))
195: return(1);
196:
197: /*
198: * get the owner's name from the control file.
199: */
200: if ((cfp = fopen(file, "r")) == NULL)
201: return(0);
202: while (getline(cfp)) {
203: if (line[0] == 'P')
204: break;
205: }
206: (void) fclose(cfp);
207: if (line[0] != 'P')
208: return(0);
209:
210: if (users == 0 && requests == 0)
211: return(!strcmp(file, current) && isowner(line+1, file));
212: /*
213: * Check the request list
214: */
215: for (n = 0, cp = file+3; isdigit(*cp); )
216: n = n * 10 + (*cp++ - '0');
217: for (r = requ; r < &requ[requests]; r++)
218: if (*r == n && isowner(line+1, file))
219: return(1);
220: /*
221: * Check to see if it's in the user list
222: */
223: for (u = user; u < &user[users]; u++)
224: if (!strcmp(*u, line+1) && isowner(line+1, file))
225: return(1);
226: return(0);
227: }
228:
229: /*
230: * If root is removing a file on the local machine, allow it.
231: * If root is removing a file from a remote machine, only allow
232: * files sent from the remote machine to be removed.
233: * Normal users can only remove the file from where it was sent.
234: */
235: isowner(owner, file)
236: char *owner, *file;
237: {
238: if (!strcmp(person, root) && (from == host || !strcmp(from, file+6)))
239: return(1);
240: if (!strcmp(person, owner) && !strcmp(from, file+6))
241: return(1);
242: if (from != host)
243: printf("%s: ", host);
244: printf("%s: Permission denied\n", file);
245: return(0);
246: }
247:
248: /*
249: * Check to see if we are sending files to a remote machine. If we are,
250: * then try removing files on the remote machine.
251: */
252: chkremote()
253: {
254: register char *cp;
255: register int i, rem;
256: char buf[BUFSIZ];
257:
258: if (*LP || RM == NULL)
259: return; /* not sending to a remote machine */
260:
261: /*
262: * Flush stdout so the user can see what has been deleted
263: * while we wait (possibly) for the connection.
264: */
265: fflush(stdout);
266:
267: sprintf(buf, "\5%s %s", RP, all ? "-all" : person);
268: cp = buf;
269: for (i = 0; i < users; i++) {
270: cp += strlen(cp);
271: *cp++ = ' ';
272: strcpy(cp, user[i]);
273: }
274: for (i = 0; i < requests; i++) {
275: cp += strlen(cp);
276: (void) sprintf(cp, " %d", requ[i]);
277: }
278: strcat(cp, "\n");
279: rem = getport(RM);
280: if (rem < 0) {
281: if (from != host)
282: printf("%s: ", host);
283: printf("connection to %s is down\n", RM);
284: } else {
285: i = strlen(buf);
286: if (write(rem, buf, i) != i)
287: fatal("Lost connection");
288: while ((i = read(rem, buf, sizeof(buf))) > 0)
289: (void) fwrite(buf, 1, i, stdout);
290: (void) close(rem);
291: }
292: }
293:
294: /*
295: * Return 1 if the filename begins with 'cf'
296: */
297: iscf(d)
298: struct direct *d;
299: {
300: return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
301: }
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