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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: static char sccsid[] = "@(#)rmjob.c 5.1 (Berkeley) 6/6/85";
9: #endif not lint
10:
11: /*
12: * rmjob - remove the specified jobs from the queue.
13: */
14:
15: #include "lp.h"
16:
17: /*
18: * Stuff for handling lprm specifications
19: */
20: extern char *user[]; /* users to process */
21: extern int users; /* # of users in user array */
22: extern int requ[]; /* job number of spool entries */
23: extern int requests; /* # of spool requests */
24: extern char *person; /* name of person doing lprm */
25:
26: char root[] = "root";
27: int all = 0; /* eliminate all files (root only) */
28: int cur_daemon; /* daemon's pid */
29: char current[40]; /* active control file name */
30:
31: int iscf();
32:
33: rmjob()
34: {
35: register int i, nitems;
36: int assasinated = 0;
37: struct direct **files;
38:
39: if ((i = pgetent(line, printer)) < 0)
40: fatal("cannot open printer description file");
41: else if (i == 0)
42: fatal("unknown printer");
43: if ((SD = pgetstr("sd", &bp)) == NULL)
44: SD = DEFSPOOL;
45: if ((LO = pgetstr("lo", &bp)) == NULL)
46: LO = DEFLOCK;
47: if ((LP = pgetstr("lp", &bp)) == NULL)
48: LP = DEFDEVLP;
49: if ((RP = pgetstr("rp", &bp)) == NULL)
50: RP = DEFLP;
51: RM = pgetstr("rm", &bp);
52:
53: /*
54: * If the format was `lprm -' and the user isn't the super-user,
55: * then fake things to look like he said `lprm user'.
56: */
57: if (users < 0) {
58: if (getuid() == 0)
59: all = 1; /* all files in local queue */
60: else {
61: user[0] = person;
62: users = 1;
63: }
64: }
65: if (!strcmp(person, "-all")) {
66: if (from == host)
67: fatal("The login name \"-all\" is reserved");
68: all = 1; /* all those from 'from' */
69: person = root;
70: }
71:
72: if (chdir(SD) < 0)
73: fatal("cannot chdir to spool directory");
74: if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
75: fatal("cannot access spool directory");
76:
77: if (nitems) {
78: /*
79: * Check for an active printer daemon (in which case we
80: * kill it if it is reading our file) then remove stuff
81: * (after which we have to restart the daemon).
82: */
83: if (lockchk(LO) && chk(current)) {
84: assasinated = kill(cur_daemon, SIGINT) == 0;
85: if (!assasinated)
86: fatal("cannot kill printer daemon");
87: }
88: /*
89: * process the files
90: */
91: for (i = 0; i < nitems; i++)
92: process(files[i]->d_name);
93: }
94: chkremote();
95: /*
96: * Restart the printer daemon if it was killed
97: */
98: if (assasinated && !startdaemon(printer))
99: fatal("cannot restart printer daemon\n");
100: exit(0);
101: }
102:
103: /*
104: * Process a lock file: collect the pid of the active
105: * daemon and the file name of the active spool entry.
106: * Return boolean indicating existence of a lock file.
107: */
108: lockchk(s)
109: char *s;
110: {
111: register FILE *fp;
112: register int i, n;
113:
114: if ((fp = fopen(s, "r")) == NULL)
115: if (errno == EACCES)
116: fatal("can't access lock file");
117: else
118: return(0);
119: if (!getline(fp)) {
120: (void) fclose(fp);
121: return(0); /* no daemon present */
122: }
123: cur_daemon = atoi(line);
124: if (kill(cur_daemon, 0) < 0) {
125: (void) fclose(fp);
126: return(0); /* no daemon present */
127: }
128: for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
129: if (i > 5) {
130: n = 1;
131: break;
132: }
133: sleep(i);
134: }
135: current[n-1] = '\0';
136: (void) fclose(fp);
137: return(1);
138: }
139:
140: /*
141: * Process a control file.
142: */
143: process(file)
144: char *file;
145: {
146: FILE *cfp;
147:
148: if (!chk(file))
149: return;
150: if ((cfp = fopen(file, "r")) == NULL)
151: fatal("cannot open %s", file);
152: while (getline(cfp)) {
153: switch (line[0]) {
154: case 'U': /* unlink associated files */
155: if (from != host)
156: printf("%s: ", host);
157: printf(unlink(line+1) ? "cannot dequeue %s\n" :
158: "%s dequeued\n", line+1);
159: }
160: }
161: (void) fclose(cfp);
162: if (from != host)
163: printf("%s: ", host);
164: printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file);
165: }
166:
167: /*
168: * Do the dirty work in checking
169: */
170: chk(file)
171: char *file;
172: {
173: register int *r, n;
174: register char **u, *cp;
175: FILE *cfp;
176:
177: /*
178: * Check for valid cf file name (mostly checking current).
179: */
180: if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
181: return(0);
182:
183: if (all && (from == host || !strcmp(from, file+6)))
184: return(1);
185:
186: /*
187: * get the owner's name from the control file.
188: */
189: if ((cfp = fopen(file, "r")) == NULL)
190: return(0);
191: while (getline(cfp)) {
192: if (line[0] == 'P')
193: break;
194: }
195: (void) fclose(cfp);
196: if (line[0] != 'P')
197: return(0);
198:
199: if (users == 0 && requests == 0)
200: return(!strcmp(file, current) && isowner(line+1, file));
201: /*
202: * Check the request list
203: */
204: for (n = 0, cp = file+3; isdigit(*cp); )
205: n = n * 10 + (*cp++ - '0');
206: for (r = requ; r < &requ[requests]; r++)
207: if (*r == n && isowner(line+1, file))
208: return(1);
209: /*
210: * Check to see if it's in the user list
211: */
212: for (u = user; u < &user[users]; u++)
213: if (!strcmp(*u, line+1) && isowner(line+1, file))
214: return(1);
215: return(0);
216: }
217:
218: /*
219: * If root is removing a file on the local machine, allow it.
220: * If root is removing a file from a remote machine, only allow
221: * files sent from the remote machine to be removed.
222: * Normal users can only remove the file from where it was sent.
223: */
224: isowner(owner, file)
225: char *owner, *file;
226: {
227: if (!strcmp(person, root) && (from == host || !strcmp(from, file+6)))
228: return(1);
229: if (!strcmp(person, owner) && !strcmp(from, file+6))
230: return(1);
231: if (from != host)
232: printf("%s: ", host);
233: printf("%s: Permission denied\n", file);
234: return(0);
235: }
236:
237: /*
238: * Check to see if we are sending files to a remote machine. If we are,
239: * then try removing files on the remote machine.
240: */
241: chkremote()
242: {
243: register char *cp;
244: register int i, rem;
245: char buf[BUFSIZ];
246:
247: if (*LP || RM == NULL)
248: return; /* not sending to a remote machine */
249:
250: /*
251: * Flush stdout so the user can see what has been deleted
252: * while we wait (possibly) for the connection.
253: */
254: fflush(stdout);
255:
256: sprintf(buf, "\5%s %s", RP, all ? "-all" : person);
257: cp = buf;
258: for (i = 0; i < users; i++) {
259: cp += strlen(cp);
260: *cp++ = ' ';
261: strcpy(cp, user[i]);
262: }
263: for (i = 0; i < requests; i++) {
264: cp += strlen(cp);
265: (void) sprintf(cp, " %d", requ[i]);
266: }
267: strcat(cp, "\n");
268: rem = getport(RM);
269: if (rem < 0) {
270: if (from != host)
271: printf("%s: ", host);
272: printf("connection to %s is down\n", RM);
273: } else {
274: i = strlen(buf);
275: if (write(rem, buf, i) != i)
276: fatal("Lost connection");
277: while ((i = read(rem, buf, sizeof(buf))) > 0)
278: (void) fwrite(buf, 1, i, stdout);
279: (void) close(rem);
280: }
281: }
282:
283: /*
284: * Return 1 if the filename begins with 'cf'
285: */
286: iscf(d)
287: struct direct *d;
288: {
289: return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
290: }
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