Commit | Line | Data |
---|---|---|
e3bebcb1 KT |
1 | #define ANY -1 |
2 | #define LIST -2 | |
3 | #define RANGE -3 | |
4 | #define EOF -4 | |
5 | char *crontab "/usr/lib/crontab"; | |
6 | char *crontmp "/tmp/crontmp"; | |
7 | char *aend; | |
8 | char *itime[2]; | |
9 | int *loct; | |
10 | int *localtime(); | |
11 | int reset(); | |
12 | int flag; | |
13 | ||
14 | main() | |
15 | { | |
16 | register i, t; | |
17 | register char *cp; | |
18 | extern char end[]; | |
19 | ||
20 | setuid(1); | |
21 | itime[0] = fork(); | |
22 | if(itime[0]) | |
23 | exit(); | |
24 | setexit(); | |
25 | signal(1, reset); | |
26 | time(itime); | |
27 | while(*localtime(itime)) | |
28 | if(itime[1]-- == 0) | |
29 | itime[0]--; | |
30 | ||
31 | loop: | |
32 | init(); | |
33 | for(i=60; i; i--) { | |
34 | loct = localtime(itime); | |
35 | for(cp = end; *cp != EOF;) { | |
36 | flag = 0; | |
37 | cp = cmp(cp, loct[1]); /* minute */ | |
38 | cp = cmp(cp, loct[2]); /* hour */ | |
39 | cp = cmp(cp, loct[3]); /* day */ | |
40 | cp = cmp(cp, loct[4]); /* month */ | |
41 | cp = cmp(cp, loct[6]); /* day of week */ | |
42 | if(flag == 0) { | |
43 | slp(); | |
44 | ex(cp); | |
45 | } | |
46 | while(*cp++ != 0) | |
47 | ; | |
48 | } | |
49 | t = itime[1] + 60; | |
50 | if(t < itime[1]) | |
51 | itime[0]++; | |
52 | itime[1] = t; | |
53 | } | |
54 | slp(); | |
55 | goto loop; | |
56 | } | |
57 | ||
58 | cmp(p, v) | |
59 | char *p; | |
60 | { | |
61 | register char *cp; | |
62 | ||
63 | cp = p; | |
64 | switch(*cp++) { | |
65 | ||
66 | case ANY: | |
67 | return(cp); | |
68 | ||
69 | case LIST: | |
70 | while(*cp != LIST) | |
71 | if(*cp++ == v) { | |
72 | while(*cp++ != LIST) | |
73 | ; | |
74 | return(cp); | |
75 | } | |
76 | flag++; | |
77 | return(cp+1); | |
78 | ||
79 | case RANGE: | |
80 | if(*cp > v || cp[1] < v) | |
81 | flag++; | |
82 | return(cp+2); | |
83 | } | |
84 | if(cp[-1] != v) | |
85 | flag++; | |
86 | return(cp); | |
87 | } | |
88 | ||
89 | slp() | |
90 | { | |
91 | register i; | |
92 | int t[2]; | |
93 | ||
94 | time(t); | |
95 | i = itime[1] - t[1]; | |
96 | if(i > 0) | |
97 | sleep(i); | |
98 | } | |
99 | ||
100 | ex(s) | |
101 | char *s; | |
102 | { | |
103 | register i; | |
104 | ||
105 | if(fork()) { | |
106 | wait(); | |
107 | return; | |
108 | } | |
109 | for(i=0; s[i]; i++); | |
110 | close(0); | |
111 | creat(crontmp, 0600); | |
112 | write(0, s, i); | |
113 | close(0); | |
114 | open(crontmp, 0); | |
115 | unlink(crontmp); | |
116 | if(fork()) | |
117 | exit(); | |
118 | execl("/bin/sh", "sh", "-t", 0); | |
119 | exit(); | |
120 | } | |
121 | ||
122 | init() | |
123 | { | |
124 | int ib[259], t[10]; | |
125 | register i, c; | |
126 | register char *cp; | |
127 | char *ocp; | |
128 | int n; | |
129 | extern char end[]; | |
130 | ||
131 | if(fopen(crontab, ib) < 0) { | |
132 | write(1, "cannot open table\n", 18); | |
133 | exit(); | |
134 | } | |
135 | cp = end; | |
136 | if(aend == 0) | |
137 | aend = cp; | |
138 | ||
139 | loop: | |
140 | ocp = cp; | |
141 | if(cp+100 > aend) { | |
142 | aend =+ 512; | |
143 | brk(aend); | |
144 | } | |
145 | for(i=0;; i++) { | |
146 | do | |
147 | c = getc(ib); | |
148 | while(c == ' ' || c == '\t'); | |
149 | if(c <= 0 || c == '\n') | |
150 | goto ignore; | |
151 | if(i == 5) | |
152 | break; | |
153 | if(c == '*') { | |
154 | *cp++ = ANY; | |
155 | continue; | |
156 | } | |
157 | n = 0; | |
158 | while(c >= '0' && c <= '9') { | |
159 | n = n*10 + c-'0'; | |
160 | c = getc(ib); | |
161 | } | |
162 | if(n < 0 || n > 100) | |
163 | goto ignore; | |
164 | if(c == ',') | |
165 | goto list; | |
166 | if(c == '-') | |
167 | goto range; | |
168 | if(c != '\t' && c != ' ') | |
169 | goto ignore; | |
170 | *cp++ = n; | |
171 | continue; | |
172 | ||
173 | list: | |
174 | *cp++ = LIST; | |
175 | *cp++ = n; | |
176 | list1: | |
177 | n = 0; | |
178 | c = getc(ib); | |
179 | while(c >= '0' && c <= '9') { | |
180 | n = n*10 + c-'0'; | |
181 | c = getc(ib); | |
182 | } | |
183 | if(n < 0 || n > 100) | |
184 | goto ignore; | |
185 | *cp++ = n; | |
186 | if(c == ',') | |
187 | goto list1; | |
188 | if(c != '\t' && c != ' ') | |
189 | goto ignore; | |
190 | *cp++ = LIST; | |
191 | continue; | |
192 | ||
193 | range: | |
194 | *cp++ = RANGE; | |
195 | *cp++ = n; | |
196 | n = 0; | |
197 | c = getc(ib); | |
198 | while(c >= '0' && c <= '9') { | |
199 | n = n*10 + c-'0'; | |
200 | c = getc(ib); | |
201 | } | |
202 | if(n < 0 || n > 100) | |
203 | goto ignore; | |
204 | if(c != '\t' && c != ' ') | |
205 | goto ignore; | |
206 | *cp++ = n; | |
207 | } | |
208 | while(c != '\n') { | |
209 | if(c <= 0) | |
210 | goto ignore; | |
211 | if(c == '%') | |
212 | c = '\n'; | |
213 | *cp++ = c; | |
214 | c = getc(ib); | |
215 | } | |
216 | *cp++ = '\n'; | |
217 | *cp++ = 0; | |
218 | goto loop; | |
219 | ||
220 | ignore: | |
221 | cp = ocp; | |
222 | while(c != '\n') { | |
223 | if(c <= 0) { | |
224 | close(ib[0]); | |
225 | *cp++ = EOF; | |
226 | *cp++ = EOF; | |
227 | aend = cp; | |
228 | brk(aend); | |
229 | return; | |
230 | } | |
231 | c = getc(ib); | |
232 | } | |
233 | goto loop; | |
234 | } |