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authorDenis Vlasenko <vda.linux@googlemail.com>2006-09-27 19:48:56 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2006-09-27 19:48:56 +0000
commit94d5d82bd84ec65d52c3df92276221d48990f306 (patch)
treedc05f1d8e8f9cb0ccf7b9192db44f03e694eb6f6
parent956a5693603be076a7a2b0bacc22eea4a3b93cbe (diff)
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crontab: we indent using tabs
Diffstat
-rw-r--r--miscutils/crontab.c549
1 files changed, 277 insertions, 272 deletions
diff --git a/miscutils/crontab.c b/miscutils/crontab.c
index 1acacc676..3706f9fd8 100644
--- a/miscutils/crontab.c
+++ b/miscutils/crontab.c
@@ -22,315 +22,320 @@
22#define CRONUPDATE "cron.update" 22#define CRONUPDATE "cron.update"
23#endif 23#endif
24#ifndef PATH_VI 24#ifndef PATH_VI
25#define PATH_VI "/bin/vi" /* location of vi */ 25#define PATH_VI "/bin/vi" /* location of vi */
26#endif 26#endif
27 27
28static const char *CDir = CRONTABS; 28static const char *CDir = CRONTABS;
29 29
30static void EditFile(const char *user, const char *file); 30static void EditFile(const char *user, const char *file);
31static int GetReplaceStream(const char *user, const char *file); 31static int GetReplaceStream(const char *user, const char *file);
32static int ChangeUser(const char *user, short dochdir); 32static int ChangeUser(const char *user, short dochdir);
33 33
34int crontab_main(int ac, char **av) 34int crontab_main(int ac, char **av)
35{ 35{
36 enum { NONE, EDIT, LIST, REPLACE, DELETE } option = NONE; 36 enum { NONE, EDIT, LIST, REPLACE, DELETE } option = NONE;
37 const struct passwd *pas; 37 const struct passwd *pas;
38 const char *repFile = NULL; 38 const char *repFile = NULL;
39 int repFd = 0; 39 int repFd = 0;
40 int i; 40 int i;
41 char caller[256]; /* user that ran program */ 41 char caller[256]; /* user that ran program */
42 int UserId; 42 char buf[1024];
43 43 int UserId;
44 UserId = getuid(); 44
45 if ((pas = getpwuid(UserId)) == NULL) 45 UserId = getuid();
46 bb_perror_msg_and_die("getpwuid"); 46 pas = getpwuid(UserId);
47 47 if (pas == NULL)
48 safe_strncpy(caller, pas->pw_name, sizeof(caller)); 48 bb_perror_msg_and_die("getpwuid");
49 49
50 i = 1; 50 safe_strncpy(caller, pas->pw_name, sizeof(caller));
51 if (ac > 1) { 51
52 if (av[1][0] == '-' && av[1][1] == 0) { 52 i = 1;
53 option = REPLACE; 53 if (ac > 1) {
54 ++i; 54 if (av[1][0] == '-' && av[1][1] == 0) {
55 } else if (av[1][0] != '-') { 55 option = REPLACE;
56 option = REPLACE; 56 ++i;
57 ++i; 57 } else if (av[1][0] != '-') {
58 repFile = av[1]; 58 option = REPLACE;
59 } 59 ++i;
60 } 60 repFile = av[1];
61
62 for (; i < ac; ++i) {
63 char *ptr = av[i];
64
65 if (*ptr != '-')
66 break;
67 ptr += 2;
68
69 switch(ptr[-1]) {
70 case 'l':
71 if (ptr[-1] == 'l')
72 option = LIST;
73 /* fall through */
74 case 'e':
75 if (ptr[-1] == 'e')
76 option = EDIT;
77 /* fall through */
78 case 'd':
79 if (ptr[-1] == 'd')
80 option = DELETE;
81 /* fall through */
82 case 'u':
83 if (i + 1 < ac && av[i+1][0] != '-') {
84 ++i;
85 if (getuid() == geteuid()) {
86 pas = getpwnam(av[i]);
87 if (pas) {
88 UserId = pas->pw_uid;
89 } else {
90 bb_error_msg_and_die("user %s unknown", av[i]);
91 }
92 } else {
93 bb_error_msg_and_die("only the superuser may specify a user");
94 } 61 }
95 }
96 break;
97 case 'c':
98 if (getuid() == geteuid()) {
99 CDir = (*ptr) ? ptr : av[++i];
100 } else {
101 bb_error_msg_and_die("-c option: superuser only");
102 }
103 break;
104 default:
105 i = ac;
106 break;
107 } 62 }
108 } 63
109 if (i != ac || option == NONE) 64 for (; i < ac; ++i) {
110 bb_show_usage(); 65 char *ptr = av[i];
111 66
112 /* 67 if (*ptr != '-')
113 * Get password entry 68 break;
114 */ 69 ptr += 2;
115 70
116 if ((pas = getpwuid(UserId)) == NULL) 71 switch (ptr[-1]) {
117 bb_perror_msg_and_die("getpwuid"); 72 case 'l':
118 73 if (ptr[-1] == 'l')
119 /* 74 option = LIST;
120 * If there is a replacement file, obtain a secure descriptor to it. 75 /* fall through */
121 */ 76 case 'e':
122 77 if (ptr[-1] == 'e')
123 if (repFile) { 78 option = EDIT;
124 repFd = GetReplaceStream(caller, repFile); 79 /* fall through */
125 if (repFd < 0) 80 case 'd':
126 bb_error_msg_and_die("unable to read replacement file"); 81 if (ptr[-1] == 'd')
127 } 82 option = DELETE;
128 83 /* fall through */
129 /* 84 case 'u':
130 * Change directory to our crontab directory 85 if (i + 1 < ac && av[i+1][0] != '-') {
131 */ 86 ++i;
132 87 if (getuid() == geteuid()) {
133 xchdir(CDir); 88 pas = getpwnam(av[i]);
134 89 if (pas) {
135 /* 90 UserId = pas->pw_uid;
136 * Handle options as appropriate 91 } else {
137 */ 92 bb_error_msg_and_die("user %s unknown", av[i]);
138 93 }
139 switch(option) { 94 } else {
140 case LIST: 95 bb_error_msg_and_die("only the superuser may specify a user");
141 { 96 }
142 FILE *fi; 97 }
143 char buf[1024]; 98 break;
144 99 case 'c':
145 if ((fi = fopen(pas->pw_name, "r"))) { 100 if (getuid() == geteuid()) {
146 while (fgets(buf, sizeof(buf), fi) != NULL) 101 CDir = (*ptr) ? ptr : av[++i];
147 fputs(buf, stdout); 102 } else {
148 fclose(fi); 103 bb_error_msg_and_die("-c option: superuser only");
149 } else { 104 }
150 bb_error_msg("no crontab for %s", pas->pw_name); 105 break;
151 } 106 default:
107 i = ac;
108 break;
109 }
152 } 110 }
153 break; 111 if (i != ac || option == NONE)
154 case EDIT: 112 bb_show_usage();
155 { 113
156 FILE *fi; 114 /*
157 int fd; 115 * Get password entry
158 int n; 116 */
159 char tmp[128]; 117
160 char buf[1024]; 118 pas = getpwuid(UserId);
161 119 if (pas == NULL)
162 snprintf(tmp, sizeof(tmp), TMPDIR "/crontab.%d", getpid()); 120 bb_perror_msg_and_die("getpwuid");
163 fd = xopen3(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600); 121
164 chown(tmp, getuid(), getgid()); 122 /*
165 if ((fi = fopen(pas->pw_name, "r"))) { 123 * If there is a replacement file, obtain a secure descriptor to it.
166 while ((n = fread(buf, 1, sizeof(buf), fi)) > 0) 124 */
167 write(fd, buf, n); 125
168 } 126 if (repFile) {
169 EditFile(caller, tmp); 127 repFd = GetReplaceStream(caller, repFile);
170 remove(tmp); 128 if (repFd < 0)
171 lseek(fd, 0L, 0); 129 bb_error_msg_and_die("unable to read replacement file");
172 repFd = fd;
173 } 130 }
174 option = REPLACE; 131
175 /* fall through */ 132 /*
176 case REPLACE: 133 * Change directory to our crontab directory
177 { 134 */
178 char buf[1024]; 135
179 char path[1024]; 136 xchdir(CDir);
180 int fd; 137
181 int n; 138 /*
182 139 * Handle options as appropriate
183 snprintf(path, sizeof(path), "%s.new", pas->pw_name); 140 */
184 if ((fd = open(path, O_CREAT|O_TRUNC|O_APPEND|O_WRONLY, 0600)) >= 0) { 141
185 while ((n = read(repFd, buf, sizeof(buf))) > 0) { 142 switch (option) {
186 write(fd, buf, n); 143 case LIST:
144 {
145 FILE *fi;
146
147 fi = fopen(pas->pw_name, "r");
148 if (fi) {
149 while (fgets(buf, sizeof(buf), fi) != NULL)
150 fputs(buf, stdout);
151 fclose(fi);
152 } else {
153 bb_error_msg("no crontab for %s", pas->pw_name);
154 }
187 } 155 }
188 close(fd);
189 rename(path, pas->pw_name);
190 } else {
191 bb_error_msg("unable to create %s/%s", CDir, path);
192 }
193 close(repFd);
194 }
195 break;
196 case DELETE:
197 remove(pas->pw_name);
198 break;
199 case NONE:
200 default:
201 break;
202 }
203
204 /*
205 * Bump notification file. Handle window where crond picks file up
206 * before we can write our entry out.
207 */
208
209 if (option == REPLACE || option == DELETE) {
210 FILE *fo;
211 struct stat st;
212
213 while ((fo = fopen(CRONUPDATE, "a"))) {
214 fprintf(fo, "%s\n", pas->pw_name);
215 fflush(fo);
216 if (fstat(fileno(fo), &st) != 0 || st.st_nlink != 0) {
217 fclose(fo);
218 break; 156 break;
219 } 157 case EDIT:
220 fclose(fo); 158 {
221 /* loop */ 159 FILE *fi;
160 int fd;
161 int n;
162 char tmp[128];
163
164 snprintf(tmp, sizeof(tmp), TMPDIR "/crontab.%d", getpid());
165 fd = xopen3(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600);
166 chown(tmp, getuid(), getgid());
167 fi = fopen(pas->pw_name, "r");
168 if (fi) {
169 while ((n = fread(buf, 1, sizeof(buf), fi)) > 0)
170 write(fd, buf, n);
171 }
172 EditFile(caller, tmp);
173 remove(tmp);
174 lseek(fd, 0L, 0);
175 repFd = fd;
176 }
177 option = REPLACE;
178 /* fall through */
179 case REPLACE:
180 {
181 char path[1024];
182 int fd;
183 int n;
184
185 snprintf(path, sizeof(path), "%s.new", pas->pw_name);
186 fd = open(path, O_CREAT|O_TRUNC|O_APPEND|O_WRONLY, 0600);
187 if (fd >= 0) {
188 while ((n = read(repFd, buf, sizeof(buf))) > 0) {
189 write(fd, buf, n);
190 }
191 close(fd);
192 rename(path, pas->pw_name);
193 } else {
194 bb_error_msg("unable to create %s/%s", CDir, path);
195 }
196 close(repFd);
197 }
198 break;
199 case DELETE:
200 remove(pas->pw_name);
201 break;
202 case NONE:
203 default:
204 break;
222 } 205 }
223 if (fo == NULL) { 206
224 bb_error_msg("unable to append to %s/%s", CDir, CRONUPDATE); 207 /*
208 * Bump notification file. Handle window where crond picks file up
209 * before we can write our entry out.
210 */
211
212 if (option == REPLACE || option == DELETE) {
213 FILE *fo;
214 struct stat st;
215
216 while ((fo = fopen(CRONUPDATE, "a"))) {
217 fprintf(fo, "%s\n", pas->pw_name);
218 fflush(fo);
219 if (fstat(fileno(fo), &st) != 0 || st.st_nlink != 0) {
220 fclose(fo);
221 break;
222 }
223 fclose(fo);
224 /* loop */
225 }
226 if (fo == NULL) {
227 bb_error_msg("unable to append to %s/%s", CDir, CRONUPDATE);
228 }
225 } 229 }
226 } 230 return 0;
227 return 0;
228} 231}
229 232
230static int GetReplaceStream(const char *user, const char *file) 233static int GetReplaceStream(const char *user, const char *file)
231{ 234{
232 int filedes[2]; 235 int filedes[2];
233 int pid; 236 int pid;
234 int fd; 237 int fd;
235 int n; 238 int n;
236 char buf[1024]; 239 char buf[1024];
237 240
238 if (pipe(filedes) < 0) { 241 if (pipe(filedes) < 0) {
239 perror("pipe"); 242 perror("pipe");
240 return(-1); 243 return -1;
241 } 244 }
242 if ((pid = fork()) < 0) { 245 pid = fork();
243 perror("fork"); 246 if (pid < 0) {
244 return(-1); 247 perror("fork");
245 } 248 return -1;
246 if (pid > 0) { 249 }
250 if (pid > 0) {
251 /*
252 * PARENT
253 */
254
255 close(filedes[1]);
256 if (read(filedes[0], buf, 1) != 1) {
257 close(filedes[0]);
258 filedes[0] = -1;
259 }
260 return filedes[0];
261 }
262
247 /* 263 /*
248 * PARENT 264 * CHILD
249 */ 265 */
250 266
251 close(filedes[1]); 267 close(filedes[0]);
252 if (read(filedes[0], buf, 1) != 1) {
253 close(filedes[0]);
254 filedes[0] = -1;
255 }
256 return(filedes[0]);
257 }
258
259 /*
260 * CHILD
261 */
262 268
263 close(filedes[0]); 269 if (ChangeUser(user, 0) < 0)
270 exit(0);
264 271
265 if (ChangeUser(user, 0) < 0) 272 bb_default_error_retval = 0;
273 fd = xopen(file, O_RDONLY);
274 buf[0] = 0;
275 write(filedes[1], buf, 1);
276 while ((n = read(fd, buf, sizeof(buf))) > 0) {
277 write(filedes[1], buf, n);
278 }
266 exit(0); 279 exit(0);
267
268 bb_default_error_retval = 0;
269 fd = xopen(file, O_RDONLY);
270 buf[0] = 0;
271 write(filedes[1], buf, 1);
272 while ((n = read(fd, buf, sizeof(buf))) > 0) {
273 write(filedes[1], buf, n);
274 }
275 exit(0);
276} 280}
277 281
278static void EditFile(const char *user, const char *file) 282static void EditFile(const char *user, const char *file)
279{ 283{
280 int pid; 284 int pid = fork();
285
286 if (pid == 0) {
287 /*
288 * CHILD - change user and run editor
289 */
290 char *ptr;
291 char visual[1024];
292
293 if (ChangeUser(user, 1) < 0)
294 exit(0);
295 ptr = getenv("VISUAL");
296 if (ptr == NULL || strlen(ptr) > 256)
297 ptr = PATH_VI;
298
299 snprintf(visual, sizeof(visual), "%s %s", ptr, file);
300 execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", visual, NULL);
301 perror("exec");
302 exit(0);
303 }
304 if (pid < 0) {
305 /*
306 * PARENT - failure
307 */
308 bb_perror_msg_and_die("fork");
309 }
310 wait4(pid, NULL, 0, NULL);
311}
312
313static int ChangeUser(const char *user, short dochdir)
314{
315 struct passwd *pas;
281 316
282 if ((pid = fork()) == 0) {
283 /* 317 /*
284 * CHILD - change user and run editor 318 * Obtain password entry and change privileges
285 */ 319 */
286 char *ptr;
287 char visual[1024];
288 320
289 if (ChangeUser(user, 1) < 0) 321 pas = getpwnam(user);
290 exit(0); 322 if (pas == NULL) {
291 if ((ptr = getenv("VISUAL")) == NULL || strlen(ptr) > 256) 323 bb_perror_msg_and_die("failed to get uid for %s", user);
292 ptr = PATH_VI; 324 }
325 setenv("USER", pas->pw_name, 1);
326 setenv("HOME", pas->pw_dir, 1);
327 setenv("SHELL", DEFAULT_SHELL, 1);
293 328
294 snprintf(visual, sizeof(visual), "%s %s", ptr, file);
295 execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", visual, NULL);
296 perror("exec");
297 exit(0);
298 }
299 if (pid < 0) {
300 /* 329 /*
301 * PARENT - failure 330 * Change running state to the user in question
302 */ 331 */
303 bb_perror_msg_and_die("fork"); 332 change_identity(pas);
304 }
305 wait4(pid, NULL, 0, NULL);
306}
307 333
308static int ChangeUser(const char *user, short dochdir) 334 if (dochdir) {
309{ 335 if (chdir(pas->pw_dir) < 0) {
310 struct passwd *pas; 336 bb_perror_msg("chdir(%s) by %s failed", pas->pw_dir, user);
311 337 xchdir(TMPDIR);
312 /* 338 }
313 * Obtain password entry and change privileges
314 */
315
316 if ((pas = getpwnam(user)) == NULL) {
317 bb_perror_msg_and_die("failed to get uid for %s", user);
318 return(-1);
319 }
320 setenv("USER", pas->pw_name, 1);
321 setenv("HOME", pas->pw_dir, 1);
322 setenv("SHELL", DEFAULT_SHELL, 1);
323
324 /*
325 * Change running state to the user in question
326 */
327 change_identity(pas);
328
329 if (dochdir) {
330 if (chdir(pas->pw_dir) < 0) {
331 bb_perror_msg("chdir failed: %s %s", user, pas->pw_dir);
332 xchdir(TMPDIR);
333 } 339 }
334 } 340 return pas->pw_uid;
335 return(pas->pw_uid);
336} 341}
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