![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to cron.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [CSRG BSD Unix] / 3BSD / cmd|
Return to cron.c CVS log | Up to [CSRG BSD Unix] / 3BSD / cmd |
1.1 root 1: #include <sys/types.h>
2: #include <stdio.h>
3: #include <ctype.h>
4: #include <signal.h>
5: #include <time.h>
6: #include <sys/stat.h>
7:
8: #define LISTS 512
9:
10: #define EXACT 0
11: #define ANY 1
12: #define LIST 2
13: #define RANGE 3
14: #define EOS 4
15: char crontab[] = "/usr/lib/crontab";
16: time_t itime;
17: struct tm *loct;
18: struct tm *localtime();
19: char *malloc();
20: char *realloc();
21: int flag;
22: char *list;
23: unsigned listsize;
24:
25: main()
26: {
27: register char *cp;
28: char *cmp();
29: time_t filetime = 0;
30:
31: setuid(1);
32: if (fork())
33: exit(0);
34: chdir("/");
35: freopen(crontab, "r", stdin);
36: freopen("/", "r", stdout);
37: freopen("/", "r", stderr);
38: signal(SIGHUP, SIG_IGN);
39: signal(SIGINT, SIG_IGN);
40: signal(SIGQUIT, SIG_IGN);
41: time(&itime);
42: itime -= localtime(&itime)->tm_sec;
43: fclose(stdin);
44:
45: for (;; itime+=60, slp()) {
46: struct stat cstat;
47:
48: if (stat(crontab, &cstat) == -1)
49: continue;
50: if (cstat.st_mtime > filetime) {
51: filetime = cstat.st_mtime;
52: init();
53: }
54: loct = localtime(&itime);
55: loct->tm_mon++; /* 1-12 for month */
56: for(cp = list; *cp != EOS;) {
57: flag = 0;
58: cp = cmp(cp, loct->tm_min);
59: cp = cmp(cp, loct->tm_hour);
60: cp = cmp(cp, loct->tm_mday);
61: cp = cmp(cp, loct->tm_mon);
62: cp = cmp(cp, loct->tm_wday);
63: if(flag == 0) {
64: slp();
65: ex(cp);
66: }
67: while(*cp++ != 0)
68: ;
69: }
70: }
71: }
72:
73: char *
74: cmp(p, v)
75: char *p;
76: {
77: register char *cp;
78:
79: cp = p;
80: switch(*cp++) {
81:
82: case EXACT:
83: if (*cp++ != v)
84: flag++;
85: return(cp);
86:
87: case ANY:
88: return(cp);
89:
90: case LIST:
91: while(*cp != LIST)
92: if(*cp++ == v) {
93: while(*cp++ != LIST)
94: ;
95: return(cp);
96: }
97: flag++;
98: return(cp+1);
99:
100: case RANGE:
101: if(*cp > v || cp[1] < v)
102: flag++;
103: return(cp+2);
104: }
105: if(cp[-1] != v)
106: flag++;
107: return(cp);
108: }
109:
110: slp()
111: {
112: register i;
113: time_t t;
114:
115: time(&t);
116: i = itime - t;
117: if(i > 0)
118: sleep(i);
119: }
120:
121: ex(s)
122: char *s;
123: {
124: int st;
125:
126: if(fork()) {
127: wait(&st);
128: return;
129: }
130: if(fork())
131: exit(0);
132: freopen("/", "r", stdin);
133: execl("/bin/sh", "sh", "-c", s, 0);
134: exit(0);
135: }
136:
137: init()
138: {
139: register i, c;
140: register char *cp;
141: register char *ocp;
142: register int n;
143:
144: freopen(crontab, "r", stdin);
145: if (list) {
146: free(list);
147: list = realloc(list, LISTS);
148: } else
149: list = malloc(LISTS);
150: listsize = LISTS;
151: cp = list;
152:
153: loop:
154: if(cp > list+listsize-100) {
155: char *olist;
156: listsize += LISTS;
157: olist = list;
158: free(list);
159: list = realloc(list, listsize);
160: cp = list + (cp - olist);
161: }
162: ocp = cp;
163: for(i=0;; i++) {
164: do
165: c = getchar();
166: while(c == ' ' || c == '\t')
167: ;
168: if(c == EOF || c == '\n')
169: goto ignore;
170: if(i == 5)
171: break;
172: if(c == '*') {
173: *cp++ = ANY;
174: continue;
175: }
176: if ((n = number(c)) < 0)
177: goto ignore;
178: c = getchar();
179: if(c == ',')
180: goto mlist;
181: if(c == '-')
182: goto mrange;
183: if(c != '\t' && c != ' ')
184: goto ignore;
185: *cp++ = EXACT;
186: *cp++ = n;
187: continue;
188:
189: mlist:
190: *cp++ = LIST;
191: *cp++ = n;
192: do {
193: if ((n = number(getchar())) < 0)
194: goto ignore;
195: *cp++ = n;
196: c = getchar();
197: } while (c==',');
198: if(c != '\t' && c != ' ')
199: goto ignore;
200: *cp++ = LIST;
201: continue;
202:
203: mrange:
204: *cp++ = RANGE;
205: *cp++ = n;
206: if ((n = number(getchar())) < 0)
207: goto ignore;
208: c = getchar();
209: if(c != '\t' && c != ' ')
210: goto ignore;
211: *cp++ = n;
212: }
213: while(c != '\n') {
214: if(c == EOF)
215: goto ignore;
216: if(c == '%')
217: c = '\n';
218: *cp++ = c;
219: c = getchar();
220: }
221: *cp++ = '\n';
222: *cp++ = 0;
223: goto loop;
224:
225: ignore:
226: cp = ocp;
227: while(c != '\n') {
228: if(c == EOF) {
229: *cp++ = EOS;
230: *cp++ = EOS;
231: fclose(stdin);
232: return;
233: }
234: c = getchar();
235: }
236: goto loop;
237: }
238:
239: number(c)
240: register c;
241: {
242: register n = 0;
243:
244: while (isdigit(c)) {
245: n = n*10 + c - '0';
246: c = getchar();
247: }
248: ungetc(c, stdin);
249: if (n>100)
250: return(-1);
251: return(n);
252: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.