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Index: logrotate.c
===================================================================
--- logrotate.c (revision 310)
+++ logrotate.c (working copy)
@@ -71,7 +71,7 @@
char *mailCommand = DEFAULT_MAIL_COMMAND;
time_t nowSecs = 0;
-static int shred_file(char *filename, struct logInfo *log);
+static int shred_file(int fd, char *filename, struct logInfo *log);
static int globerr(const char *pathname, int theerr)
{
@@ -231,59 +231,79 @@
return fd;
}
-#define SHRED_CALL "shred -u "
-#define SHRED_COUNT_FLAG "-n "
#define DIGITS 10
+
/* unlink, but try to call shred from GNU fileutils */
-static int shred_file(char *filename, struct logInfo *log)
+static int shred_file(int fd, char *filename, struct logInfo *log)
{
- int len, ret;
- char *cmd;
char count[DIGITS]; /* that's a lot of shredding :) */
+ const char **fullCommand;
+ int id = 0;
+ int status;
if (!(log->flags & LOG_FLAG_SHRED)) {
return unlink(filename);
}
- len = strlen(filename) + strlen(SHRED_CALL);
- len += strlen(SHRED_COUNT_FLAG) + DIGITS;
- cmd = malloc(len);
+ message(MESS_DEBUG, "Using shred to remove the file %s\n", filename);
- if (!cmd) {
- message(MESS_ERROR, "malloc error while shredding");
- return unlink(filename);
+ if (log->shred_cycles != 0) {
+ fullCommand = alloca(sizeof(*fullCommand) * 6);
}
- strcpy(cmd, SHRED_CALL);
+ else {
+ fullCommand = alloca(sizeof(*fullCommand) * 4);
+ }
+ fullCommand[id++] = "shred";
+ fullCommand[id++] = "-u";
+
if (log->shred_cycles != 0) {
- strcat(cmd, SHRED_COUNT_FLAG);
+ fullCommand[id++] = "-n";
snprintf(count, DIGITS - 1, "%d", log->shred_cycles);
- strcat(count, " ");
- strcat(cmd, count);
+ fullCommand[id++] = count;
}
- strcat(cmd, filename);
- ret = system(cmd);
- free(cmd);
- if (ret != 0) {
+ fullCommand[id++] = "-";
+ fullCommand[id++] = NULL;
+
+ if (!fork()) {
+ dup2(fd, 1);
+ close(fd);
+
+ execvp(fullCommand[0], (void *) fullCommand);
+ exit(1);
+ }
+
+ wait(&status);
+
+ if (!WIFEXITED(status) || WEXITSTATUS(status)) {
message(MESS_ERROR, "Failed to shred %s\n, trying unlink", filename);
- if (ret != -1) {
- message(MESS_NORMAL, "Shred returned %d\n", ret);
- }
return unlink(filename);
- } else {
- return ret;
}
+
+ /* We have to unlink it after shred anyway,
+ * because it doesn't remove the file itself */
+ return unlink(filename);
}
static int removeLogFile(char *name, struct logInfo *log)
{
- message(MESS_DEBUG, "removing old log %s\n", name);
+ int fd;
+ message(MESS_DEBUG, "removing old log %s\n", name);
- if (!debug && shred_file(name, log)) {
- message(MESS_ERROR, "Failed to remove old log %s: %s\n",
- name, strerror(errno));
- return 1;
- }
- return 0;
+ if ((fd = open(name, O_RDWR)) < 0) {
+ message(MESS_ERROR, "error opening %s: %s\n",
+ name, strerror(errno));
+ return 1;
+ }
+
+ if (!debug && shred_file(fd, name, log)) {
+ message(MESS_ERROR, "Failed to remove old log %s: %s\n",
+ name, strerror(errno));
+ close(fd);
+ return 1;
+ }
+
+ close(fd);
+ return 0;
}
static int compressLogFile(char *name, struct logInfo *log, struct stat *sb)
@@ -310,7 +330,7 @@
compressedName = alloca(strlen(name) + strlen(log->compress_ext) + 2);
sprintf(compressedName, "%s%s", name, log->compress_ext);
- if ((inFile = open(name, O_RDONLY)) < 0) {
+ if ((inFile = open(name, O_RDWR)) < 0) {
message(MESS_ERROR, "unable to open %s for compression\n", name);
return 1;
}
@@ -357,7 +377,6 @@
exit(1);
}
- close(inFile);
close(outFile);
wait(&status);
@@ -373,7 +392,8 @@
/* If we can't change atime/mtime, it's not a disaster.
It might possibly fail under SELinux. */
- shred_file(name, log);
+ shred_file(inFile, name, log);
+ close(inFile);
return 0;
}
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