Commit | Line | Data |
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3b600ead TL |
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 | } |