Commit | Line | Data |
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ce4fd43b | 1 | #ifndef lint |
8fe4ad90 | 2 | static char *sccsid = "@(#)cron.c 4.8 (Berkeley) %G%"; |
ce4fd43b SL |
3 | #endif |
4 | ||
87404803 BJ |
5 | #include <sys/types.h> |
6 | #include <stdio.h> | |
7 | #include <ctype.h> | |
8 | #include <signal.h> | |
ce4fd43b | 9 | #include <sys/time.h> |
87404803 BJ |
10 | #include <sys/stat.h> |
11 | ||
3eeb310b BJ |
12 | #define LISTS (2*BUFSIZ) |
13 | #define MAXLIN BUFSIZ | |
87404803 | 14 | |
26fec655 BJ |
15 | #define EXACT 100 |
16 | #define ANY 101 | |
17 | #define LIST 102 | |
18 | #define RANGE 103 | |
19 | #define EOS 104 | |
87404803 BJ |
20 | char crontab[] = "/usr/lib/crontab"; |
21 | time_t itime; | |
22 | struct tm *loct; | |
23 | struct tm *localtime(); | |
24 | char *malloc(); | |
25 | char *realloc(); | |
26 | int flag; | |
27 | char *list; | |
28 | unsigned listsize; | |
29 | ||
30 | main() | |
31 | { | |
32 | register char *cp; | |
33 | char *cmp(); | |
34 | time_t filetime = 0; | |
35 | ||
36 | /* setuid(1); */ | |
37 | if (fork()) | |
38 | exit(0); | |
39 | chdir("/"); | |
40 | freopen(crontab, "r", stdin); | |
41 | freopen("/", "r", stdout); | |
42 | freopen("/", "r", stderr); | |
43 | signal(SIGHUP, SIG_IGN); | |
44 | signal(SIGINT, SIG_IGN); | |
45 | signal(SIGQUIT, SIG_IGN); | |
46 | time(&itime); | |
47 | itime -= localtime(&itime)->tm_sec; | |
48 | fclose(stdin); | |
49 | ||
50 | for (;; itime+=60, slp()) { | |
51 | struct stat cstat; | |
52 | ||
53 | if (stat(crontab, &cstat) == -1) | |
54 | continue; | |
55 | if (cstat.st_mtime > filetime) { | |
56 | filetime = cstat.st_mtime; | |
57 | init(); | |
58 | } | |
59 | loct = localtime(&itime); | |
60 | loct->tm_mon++; /* 1-12 for month */ | |
fd14b795 | 61 | if (loct->tm_wday == 0) |
8fe4ad90 | 62 | loct->tm_wday = 7; /* sunday is 7, not 0 */ |
87404803 BJ |
63 | for(cp = list; *cp != EOS;) { |
64 | flag = 0; | |
65 | cp = cmp(cp, loct->tm_min); | |
66 | cp = cmp(cp, loct->tm_hour); | |
67 | cp = cmp(cp, loct->tm_mday); | |
68 | cp = cmp(cp, loct->tm_mon); | |
69 | cp = cmp(cp, loct->tm_wday); | |
edf12f68 | 70 | if(flag == 0) |
87404803 | 71 | ex(cp); |
87404803 BJ |
72 | while(*cp++ != 0) |
73 | ; | |
74 | } | |
75 | } | |
76 | } | |
77 | ||
78 | char * | |
79 | cmp(p, v) | |
80 | char *p; | |
81 | { | |
82 | register char *cp; | |
83 | ||
84 | cp = p; | |
85 | switch(*cp++) { | |
86 | ||
87 | case EXACT: | |
88 | if (*cp++ != v) | |
89 | flag++; | |
90 | return(cp); | |
91 | ||
92 | case ANY: | |
93 | return(cp); | |
94 | ||
95 | case LIST: | |
96 | while(*cp != LIST) | |
97 | if(*cp++ == v) { | |
98 | while(*cp++ != LIST) | |
99 | ; | |
100 | return(cp); | |
101 | } | |
102 | flag++; | |
103 | return(cp+1); | |
104 | ||
105 | case RANGE: | |
106 | if(*cp > v || cp[1] < v) | |
107 | flag++; | |
108 | return(cp+2); | |
109 | } | |
110 | if(cp[-1] != v) | |
111 | flag++; | |
112 | return(cp); | |
113 | } | |
114 | ||
115 | slp() | |
116 | { | |
117 | register i; | |
118 | time_t t; | |
119 | ||
120 | time(&t); | |
121 | i = itime - t; | |
edf12f68 BJ |
122 | if(i < -60 * 60 || i > 60 * 60) { |
123 | itime = t; | |
124 | i = 60 - localtime(&itime)->tm_sec; | |
125 | itime += i; | |
126 | } | |
87404803 BJ |
127 | if(i > 0) |
128 | sleep(i); | |
129 | } | |
130 | ||
131 | ex(s) | |
132 | char *s; | |
133 | { | |
134 | int st; | |
135 | ||
136 | if(fork()) { | |
137 | wait(&st); | |
138 | return; | |
139 | } | |
140 | if(fork()) | |
141 | exit(0); | |
142 | freopen("/", "r", stdin); | |
143 | execl("/bin/sh", "sh", "-c", s, 0); | |
144 | exit(0); | |
145 | } | |
146 | ||
147 | init() | |
148 | { | |
149 | register i, c; | |
150 | register char *cp; | |
151 | register char *ocp; | |
152 | register int n; | |
153 | ||
154 | freopen(crontab, "r", stdin); | |
155 | if (list) { | |
156 | free(list); | |
157 | list = realloc(list, LISTS); | |
158 | } else | |
159 | list = malloc(LISTS); | |
160 | listsize = LISTS; | |
161 | cp = list; | |
162 | ||
163 | loop: | |
3eeb310b | 164 | if(cp > list+listsize-MAXLIN) { |
87404803 BJ |
165 | char *olist; |
166 | listsize += LISTS; | |
167 | olist = list; | |
168 | free(list); | |
169 | list = realloc(list, listsize); | |
170 | cp = list + (cp - olist); | |
171 | } | |
172 | ocp = cp; | |
173 | for(i=0;; i++) { | |
174 | do | |
175 | c = getchar(); | |
176 | while(c == ' ' || c == '\t') | |
177 | ; | |
178 | if(c == EOF || c == '\n') | |
179 | goto ignore; | |
180 | if(i == 5) | |
181 | break; | |
182 | if(c == '*') { | |
183 | *cp++ = ANY; | |
184 | continue; | |
185 | } | |
186 | if ((n = number(c)) < 0) | |
187 | goto ignore; | |
188 | c = getchar(); | |
189 | if(c == ',') | |
190 | goto mlist; | |
191 | if(c == '-') | |
192 | goto mrange; | |
193 | if(c != '\t' && c != ' ') | |
194 | goto ignore; | |
195 | *cp++ = EXACT; | |
196 | *cp++ = n; | |
197 | continue; | |
198 | ||
199 | mlist: | |
200 | *cp++ = LIST; | |
201 | *cp++ = n; | |
202 | do { | |
203 | if ((n = number(getchar())) < 0) | |
204 | goto ignore; | |
205 | *cp++ = n; | |
206 | c = getchar(); | |
207 | } while (c==','); | |
208 | if(c != '\t' && c != ' ') | |
209 | goto ignore; | |
210 | *cp++ = LIST; | |
211 | continue; | |
212 | ||
213 | mrange: | |
214 | *cp++ = RANGE; | |
215 | *cp++ = n; | |
216 | if ((n = number(getchar())) < 0) | |
217 | goto ignore; | |
218 | c = getchar(); | |
219 | if(c != '\t' && c != ' ') | |
220 | goto ignore; | |
221 | *cp++ = n; | |
222 | } | |
223 | while(c != '\n') { | |
224 | if(c == EOF) | |
225 | goto ignore; | |
226 | if(c == '%') | |
227 | c = '\n'; | |
228 | *cp++ = c; | |
229 | c = getchar(); | |
230 | } | |
231 | *cp++ = '\n'; | |
232 | *cp++ = 0; | |
233 | goto loop; | |
234 | ||
235 | ignore: | |
236 | cp = ocp; | |
237 | while(c != '\n') { | |
238 | if(c == EOF) { | |
239 | *cp++ = EOS; | |
240 | *cp++ = EOS; | |
241 | fclose(stdin); | |
242 | return; | |
243 | } | |
244 | c = getchar(); | |
245 | } | |
246 | goto loop; | |
247 | } | |
248 | ||
249 | number(c) | |
250 | register c; | |
251 | { | |
252 | register n = 0; | |
253 | ||
254 | while (isdigit(c)) { | |
255 | n = n*10 + c - '0'; | |
256 | c = getchar(); | |
257 | } | |
258 | ungetc(c, stdin); | |
259 | if (n>100) | |
260 | return(-1); | |
261 | return(n); | |
262 | } |