Commit | Line | Data |
---|---|---|
87404803 BJ |
1 | static char *sccsid = "@(#)cron.c 4.1 (Berkeley) %G%"; |
2 | #include <sys/types.h> | |
3 | #include <stdio.h> | |
4 | #include <ctype.h> | |
5 | #include <signal.h> | |
6 | #include <time.h> | |
7 | #include <sys/stat.h> | |
8 | ||
9 | #define LISTS 512 | |
10 | ||
11 | #define EXACT 0 | |
12 | #define ANY 1 | |
13 | #define LIST 2 | |
14 | #define RANGE 3 | |
15 | #define EOS 4 | |
16 | char crontab[] = "/usr/lib/crontab"; | |
17 | time_t itime; | |
18 | struct tm *loct; | |
19 | struct tm *localtime(); | |
20 | char *malloc(); | |
21 | char *realloc(); | |
22 | int flag; | |
23 | char *list; | |
24 | unsigned listsize; | |
25 | ||
26 | main() | |
27 | { | |
28 | register char *cp; | |
29 | char *cmp(); | |
30 | time_t filetime = 0; | |
31 | ||
32 | /* setuid(1); */ | |
33 | if (fork()) | |
34 | exit(0); | |
35 | chdir("/"); | |
36 | freopen(crontab, "r", stdin); | |
37 | freopen("/", "r", stdout); | |
38 | freopen("/", "r", stderr); | |
39 | signal(SIGHUP, SIG_IGN); | |
40 | signal(SIGINT, SIG_IGN); | |
41 | signal(SIGQUIT, SIG_IGN); | |
42 | time(&itime); | |
43 | itime -= localtime(&itime)->tm_sec; | |
44 | fclose(stdin); | |
45 | ||
46 | for (;; itime+=60, slp()) { | |
47 | struct stat cstat; | |
48 | ||
49 | if (stat(crontab, &cstat) == -1) | |
50 | continue; | |
51 | if (cstat.st_mtime > filetime) { | |
52 | filetime = cstat.st_mtime; | |
53 | init(); | |
54 | } | |
55 | loct = localtime(&itime); | |
56 | loct->tm_mon++; /* 1-12 for month */ | |
57 | for(cp = list; *cp != EOS;) { | |
58 | flag = 0; | |
59 | cp = cmp(cp, loct->tm_min); | |
60 | cp = cmp(cp, loct->tm_hour); | |
61 | cp = cmp(cp, loct->tm_mday); | |
62 | cp = cmp(cp, loct->tm_mon); | |
63 | cp = cmp(cp, loct->tm_wday); | |
64 | if(flag == 0) { | |
65 | slp(); | |
66 | ex(cp); | |
67 | } | |
68 | while(*cp++ != 0) | |
69 | ; | |
70 | } | |
71 | } | |
72 | } | |
73 | ||
74 | char * | |
75 | cmp(p, v) | |
76 | char *p; | |
77 | { | |
78 | register char *cp; | |
79 | ||
80 | cp = p; | |
81 | switch(*cp++) { | |
82 | ||
83 | case EXACT: | |
84 | if (*cp++ != v) | |
85 | flag++; | |
86 | return(cp); | |
87 | ||
88 | case ANY: | |
89 | return(cp); | |
90 | ||
91 | case LIST: | |
92 | while(*cp != LIST) | |
93 | if(*cp++ == v) { | |
94 | while(*cp++ != LIST) | |
95 | ; | |
96 | return(cp); | |
97 | } | |
98 | flag++; | |
99 | return(cp+1); | |
100 | ||
101 | case RANGE: | |
102 | if(*cp > v || cp[1] < v) | |
103 | flag++; | |
104 | return(cp+2); | |
105 | } | |
106 | if(cp[-1] != v) | |
107 | flag++; | |
108 | return(cp); | |
109 | } | |
110 | ||
111 | slp() | |
112 | { | |
113 | register i; | |
114 | time_t t; | |
115 | ||
116 | time(&t); | |
117 | i = itime - t; | |
118 | if(i > 0) | |
119 | sleep(i); | |
120 | } | |
121 | ||
122 | ex(s) | |
123 | char *s; | |
124 | { | |
125 | int st; | |
126 | ||
127 | if(fork()) { | |
128 | wait(&st); | |
129 | return; | |
130 | } | |
131 | if(fork()) | |
132 | exit(0); | |
133 | freopen("/", "r", stdin); | |
134 | execl("/bin/sh", "sh", "-c", s, 0); | |
135 | exit(0); | |
136 | } | |
137 | ||
138 | init() | |
139 | { | |
140 | register i, c; | |
141 | register char *cp; | |
142 | register char *ocp; | |
143 | register int n; | |
144 | ||
145 | freopen(crontab, "r", stdin); | |
146 | if (list) { | |
147 | free(list); | |
148 | list = realloc(list, LISTS); | |
149 | } else | |
150 | list = malloc(LISTS); | |
151 | listsize = LISTS; | |
152 | cp = list; | |
153 | ||
154 | loop: | |
155 | if(cp > list+listsize-100) { | |
156 | char *olist; | |
157 | listsize += LISTS; | |
158 | olist = list; | |
159 | free(list); | |
160 | list = realloc(list, listsize); | |
161 | cp = list + (cp - olist); | |
162 | } | |
163 | ocp = cp; | |
164 | for(i=0;; i++) { | |
165 | do | |
166 | c = getchar(); | |
167 | while(c == ' ' || c == '\t') | |
168 | ; | |
169 | if(c == EOF || c == '\n') | |
170 | goto ignore; | |
171 | if(i == 5) | |
172 | break; | |
173 | if(c == '*') { | |
174 | *cp++ = ANY; | |
175 | continue; | |
176 | } | |
177 | if ((n = number(c)) < 0) | |
178 | goto ignore; | |
179 | c = getchar(); | |
180 | if(c == ',') | |
181 | goto mlist; | |
182 | if(c == '-') | |
183 | goto mrange; | |
184 | if(c != '\t' && c != ' ') | |
185 | goto ignore; | |
186 | *cp++ = EXACT; | |
187 | *cp++ = n; | |
188 | continue; | |
189 | ||
190 | mlist: | |
191 | *cp++ = LIST; | |
192 | *cp++ = n; | |
193 | do { | |
194 | if ((n = number(getchar())) < 0) | |
195 | goto ignore; | |
196 | *cp++ = n; | |
197 | c = getchar(); | |
198 | } while (c==','); | |
199 | if(c != '\t' && c != ' ') | |
200 | goto ignore; | |
201 | *cp++ = LIST; | |
202 | continue; | |
203 | ||
204 | mrange: | |
205 | *cp++ = RANGE; | |
206 | *cp++ = n; | |
207 | if ((n = number(getchar())) < 0) | |
208 | goto ignore; | |
209 | c = getchar(); | |
210 | if(c != '\t' && c != ' ') | |
211 | goto ignore; | |
212 | *cp++ = n; | |
213 | } | |
214 | while(c != '\n') { | |
215 | if(c == EOF) | |
216 | goto ignore; | |
217 | if(c == '%') | |
218 | c = '\n'; | |
219 | *cp++ = c; | |
220 | c = getchar(); | |
221 | } | |
222 | *cp++ = '\n'; | |
223 | *cp++ = 0; | |
224 | goto loop; | |
225 | ||
226 | ignore: | |
227 | cp = ocp; | |
228 | while(c != '\n') { | |
229 | if(c == EOF) { | |
230 | *cp++ = EOS; | |
231 | *cp++ = EOS; | |
232 | fclose(stdin); | |
233 | return; | |
234 | } | |
235 | c = getchar(); | |
236 | } | |
237 | goto loop; | |
238 | } | |
239 | ||
240 | number(c) | |
241 | register c; | |
242 | { | |
243 | register n = 0; | |
244 | ||
245 | while (isdigit(c)) { | |
246 | n = n*10 + c - '0'; | |
247 | c = getchar(); | |
248 | } | |
249 | ungetc(c, stdin); | |
250 | if (n>100) | |
251 | return(-1); | |
252 | return(n); | |
253 | } |